1 /* Process declarations and variables for C compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
3 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
4 Free Software Foundation, Inc.
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 3, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
22 /* Process declarations and symbol lookup for C front end.
23 Also constructs types; the standard scalar types at initialization,
24 and structure, union, array and enum types when they are declared. */
26 /* ??? not all decl nodes are given the most useful possible
27 line numbers. For example, the CONST_DECLs for enum values. */
31 #include "coretypes.h"
36 #include "tree-inline.h"
48 #include "c-family/c-common.h"
49 #include "c-family/c-pragma.h"
51 #include "langhooks.h"
52 #include "tree-mudflap.h"
53 #include "tree-iterator.h"
54 #include "diagnostic-core.h"
55 #include "tree-dump.h"
58 #include "langhooks-def.h"
59 #include "pointer-set.h"
61 #include "c-family/c-ada-spec.h"
63 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
65 { NORMAL
, /* Ordinary declaration */
66 FUNCDEF
, /* Function definition */
67 PARM
, /* Declaration of parm before function body */
68 FIELD
, /* Declaration inside struct or union */
69 TYPENAME
}; /* Typename (inside cast or sizeof) */
71 /* States indicating how grokdeclarator() should handle declspecs marked
72 with __attribute__((deprecated)). An object declared as
73 __attribute__((deprecated)) suppresses warnings of uses of other
76 enum deprecated_states
{
82 /* Nonzero if we have seen an invalid cross reference
83 to a struct, union, or enum, but not yet printed the message. */
84 tree pending_invalid_xref
;
86 /* File and line to appear in the eventual error message. */
87 location_t pending_invalid_xref_location
;
89 /* The file and line that the prototype came from if this is an
90 old-style definition; used for diagnostics in
91 store_parm_decls_oldstyle. */
93 static location_t current_function_prototype_locus
;
95 /* Whether this prototype was built-in. */
97 static bool current_function_prototype_built_in
;
99 /* The argument type information of this prototype. */
101 static tree current_function_prototype_arg_types
;
103 /* The argument information structure for the function currently being
106 static struct c_arg_info
*current_function_arg_info
;
108 /* The obstack on which parser and related data structures, which are
109 not live beyond their top-level declaration or definition, are
111 struct obstack parser_obstack
;
113 /* The current statement tree. */
115 static GTY(()) struct stmt_tree_s c_stmt_tree
;
117 /* State saving variables. */
121 /* A list of decls to be made automatically visible in each file scope. */
122 static GTY(()) tree visible_builtins
;
124 /* Set to 0 at beginning of a function definition, set to 1 if
125 a return statement that specifies a return value is seen. */
127 int current_function_returns_value
;
129 /* Set to 0 at beginning of a function definition, set to 1 if
130 a return statement with no argument is seen. */
132 int current_function_returns_null
;
134 /* Set to 0 at beginning of a function definition, set to 1 if
135 a call to a noreturn function is seen. */
137 int current_function_returns_abnormally
;
139 /* Set to nonzero by `grokdeclarator' for a function
140 whose return type is defaulted, if warnings for this are desired. */
142 static int warn_about_return_type
;
144 /* Nonzero when the current toplevel function contains a declaration
145 of a nested function which is never defined. */
147 static bool undef_nested_function
;
149 /* True means global_bindings_p should return false even if the scope stack
150 says we are in file scope. */
151 bool c_override_global_bindings_to_false
;
154 /* Each c_binding structure describes one binding of an identifier to
155 a decl. All the decls in a scope - irrespective of namespace - are
156 chained together by the ->prev field, which (as the name implies)
157 runs in reverse order. All the decls in a given namespace bound to
158 a given identifier are chained by the ->shadowed field, which runs
159 from inner to outer scopes.
161 The ->decl field usually points to a DECL node, but there are two
162 exceptions. In the namespace of type tags, the bound entity is a
163 RECORD_TYPE, UNION_TYPE, or ENUMERAL_TYPE node. If an undeclared
164 identifier is encountered, it is bound to error_mark_node to
165 suppress further errors about that identifier in the current
168 The ->u.type field stores the type of the declaration in this scope;
169 if NULL, the type is the type of the ->decl field. This is only of
170 relevance for objects with external or internal linkage which may
171 be redeclared in inner scopes, forming composite types that only
172 persist for the duration of those scopes. In the external scope,
173 this stores the composite of all the types declared for this
174 object, visible or not. The ->inner_comp field (used only at file
175 scope) stores whether an incomplete array type at file scope was
176 completed at an inner scope to an array size other than 1.
178 The ->u.label field is used for labels. It points to a structure
179 which stores additional information used for warnings.
181 The depth field is copied from the scope structure that holds this
182 decl. It is used to preserve the proper ordering of the ->shadowed
183 field (see bind()) and also for a handful of special-case checks.
184 Finally, the invisible bit is true for a decl which should be
185 ignored for purposes of normal name lookup, and the nested bit is
186 true for a decl that's been bound a second time in an inner scope;
187 in all such cases, the binding in the outer scope will have its
188 invisible bit true. */
190 struct GTY((chain_next ("%h.prev"))) c_binding
{
191 union GTY(()) { /* first so GTY desc can use decl */
192 tree
GTY((tag ("0"))) type
; /* the type in this scope */
193 struct c_label_vars
* GTY((tag ("1"))) label
; /* for warnings */
194 } GTY((desc ("TREE_CODE (%0.decl) == LABEL_DECL"))) u
;
195 tree decl
; /* the decl bound */
196 tree id
; /* the identifier it's bound to */
197 struct c_binding
*prev
; /* the previous decl in this scope */
198 struct c_binding
*shadowed
; /* the innermost decl shadowed by this one */
199 unsigned int depth
: 28; /* depth of this scope */
200 BOOL_BITFIELD invisible
: 1; /* normal lookup should ignore this binding */
201 BOOL_BITFIELD nested
: 1; /* do not set DECL_CONTEXT when popping */
202 BOOL_BITFIELD inner_comp
: 1; /* incomplete array completed in inner scope */
203 BOOL_BITFIELD in_struct
: 1; /* currently defined as struct field */
204 location_t locus
; /* location for nested bindings */
206 #define B_IN_SCOPE(b1, b2) ((b1)->depth == (b2)->depth)
207 #define B_IN_CURRENT_SCOPE(b) ((b)->depth == current_scope->depth)
208 #define B_IN_FILE_SCOPE(b) ((b)->depth == 1 /*file_scope->depth*/)
209 #define B_IN_EXTERNAL_SCOPE(b) ((b)->depth == 0 /*external_scope->depth*/)
211 #define I_SYMBOL_BINDING(node) \
212 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->symbol_binding)
213 #define I_SYMBOL_DECL(node) \
214 (I_SYMBOL_BINDING(node) ? I_SYMBOL_BINDING(node)->decl : 0)
216 #define I_TAG_BINDING(node) \
217 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->tag_binding)
218 #define I_TAG_DECL(node) \
219 (I_TAG_BINDING(node) ? I_TAG_BINDING(node)->decl : 0)
221 #define I_LABEL_BINDING(node) \
222 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->label_binding)
223 #define I_LABEL_DECL(node) \
224 (I_LABEL_BINDING(node) ? I_LABEL_BINDING(node)->decl : 0)
226 /* Each C symbol points to three linked lists of c_binding structures.
227 These describe the values of the identifier in the three different
228 namespaces defined by the language. */
230 struct GTY(()) lang_identifier
{
231 struct c_common_identifier common_id
;
232 struct c_binding
*symbol_binding
; /* vars, funcs, constants, typedefs */
233 struct c_binding
*tag_binding
; /* struct/union/enum tags */
234 struct c_binding
*label_binding
; /* labels */
237 /* Validate c-lang.c's assumptions. */
238 extern char C_SIZEOF_STRUCT_LANG_IDENTIFIER_isnt_accurate
239 [(sizeof(struct lang_identifier
) == C_SIZEOF_STRUCT_LANG_IDENTIFIER
) ? 1 : -1];
241 /* The resulting tree type. */
243 union GTY((desc ("TREE_CODE (&%h.generic) == IDENTIFIER_NODE"),
244 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
246 union tree_node
GTY ((tag ("0"),
247 desc ("tree_node_structure (&%h)")))
249 struct lang_identifier
GTY ((tag ("1"))) identifier
;
252 /* Track bindings and other things that matter for goto warnings. For
253 efficiency, we do not gather all the decls at the point of
254 definition. Instead, we point into the bindings structure. As
255 scopes are popped, we update these structures and gather the decls
256 that matter at that time. */
258 struct GTY(()) c_spot_bindings
{
259 /* The currently open scope which holds bindings defined when the
260 label was defined or the goto statement was found. */
261 struct c_scope
*scope
;
262 /* The bindings in the scope field which were defined at the point
263 of the label or goto. This lets us look at older or newer
264 bindings in the scope, as appropriate. */
265 struct c_binding
*bindings_in_scope
;
266 /* The number of statement expressions that have started since this
267 label or goto statement was defined. This is zero if we are at
268 the same statement expression level. It is positive if we are in
269 a statement expression started since this spot. It is negative
270 if this spot was in a statement expression and we have left
273 /* Whether we started in a statement expression but are no longer in
274 it. This is set to true if stmt_exprs ever goes negative. */
278 /* This structure is used to keep track of bindings seen when a goto
279 statement is defined. This is only used if we see the goto
280 statement before we see the label. */
282 struct GTY(()) c_goto_bindings
{
283 /* The location of the goto statement. */
285 /* The bindings of the goto statement. */
286 struct c_spot_bindings goto_bindings
;
289 typedef struct c_goto_bindings
*c_goto_bindings_p
;
290 DEF_VEC_P(c_goto_bindings_p
);
291 DEF_VEC_ALLOC_P(c_goto_bindings_p
,gc
);
293 /* The additional information we keep track of for a label binding.
294 These fields are updated as scopes are popped. */
296 struct GTY(()) c_label_vars
{
297 /* The shadowed c_label_vars, when one label shadows another (which
298 can only happen using a __label__ declaration). */
299 struct c_label_vars
*shadowed
;
300 /* The bindings when the label was defined. */
301 struct c_spot_bindings label_bindings
;
302 /* A list of decls that we care about: decls about which we should
303 warn if a goto branches to this label from later in the function.
304 Decls are added to this list as scopes are popped. We only add
305 the decls that matter. */
306 VEC(tree
,gc
) *decls_in_scope
;
307 /* A list of goto statements to this label. This is only used for
308 goto statements seen before the label was defined, so that we can
309 issue appropriate warnings for them. */
310 VEC(c_goto_bindings_p
,gc
) *gotos
;
313 /* Each c_scope structure describes the complete contents of one
314 scope. Four scopes are distinguished specially: the innermost or
315 current scope, the innermost function scope, the file scope (always
316 the second to outermost) and the outermost or external scope.
318 Most declarations are recorded in the current scope.
320 All normal label declarations are recorded in the innermost
321 function scope, as are bindings of undeclared identifiers to
322 error_mark_node. (GCC permits nested functions as an extension,
323 hence the 'innermost' qualifier.) Explicitly declared labels
324 (using the __label__ extension) appear in the current scope.
326 Being in the file scope (current_scope == file_scope) causes
327 special behavior in several places below. Also, under some
328 conditions the Objective-C front end records declarations in the
329 file scope even though that isn't the current scope.
331 All declarations with external linkage are recorded in the external
332 scope, even if they aren't visible there; this models the fact that
333 such declarations are visible to the entire program, and (with a
334 bit of cleverness, see pushdecl) allows diagnosis of some violations
335 of C99 6.2.2p7 and 6.2.7p2:
337 If, within the same translation unit, the same identifier appears
338 with both internal and external linkage, the behavior is
341 All declarations that refer to the same object or function shall
342 have compatible type; otherwise, the behavior is undefined.
344 Initially only the built-in declarations, which describe compiler
345 intrinsic functions plus a subset of the standard library, are in
348 The order of the blocks list matters, and it is frequently appended
349 to. To avoid having to walk all the way to the end of the list on
350 each insertion, or reverse the list later, we maintain a pointer to
351 the last list entry. (FIXME: It should be feasible to use a reversed
354 The bindings list is strictly in reverse order of declarations;
355 pop_scope relies on this. */
358 struct GTY((chain_next ("%h.outer"))) c_scope
{
359 /* The scope containing this one. */
360 struct c_scope
*outer
;
362 /* The next outermost function scope. */
363 struct c_scope
*outer_function
;
365 /* All bindings in this scope. */
366 struct c_binding
*bindings
;
368 /* For each scope (except the global one), a chain of BLOCK nodes
369 for all the scopes that were entered and exited one level down. */
373 /* The depth of this scope. Used to keep the ->shadowed chain of
374 bindings sorted innermost to outermost. */
375 unsigned int depth
: 28;
377 /* True if we are currently filling this scope with parameter
379 BOOL_BITFIELD parm_flag
: 1;
381 /* True if we saw [*] in this scope. Used to give an error messages
382 if these appears in a function definition. */
383 BOOL_BITFIELD had_vla_unspec
: 1;
385 /* True if we already complained about forward parameter decls
386 in this scope. This prevents double warnings on
387 foo (int a; int b; ...) */
388 BOOL_BITFIELD warned_forward_parm_decls
: 1;
390 /* True if this is the outermost block scope of a function body.
391 This scope contains the parameters, the local variables declared
392 in the outermost block, and all the labels (except those in
393 nested functions, or declared at block scope with __label__). */
394 BOOL_BITFIELD function_body
: 1;
396 /* True means make a BLOCK for this scope no matter what. */
397 BOOL_BITFIELD keep
: 1;
399 /* True means that an unsuffixed float constant is _Decimal64. */
400 BOOL_BITFIELD float_const_decimal64
: 1;
402 /* True if this scope has any label bindings. This is used to speed
403 up searching for labels when popping scopes, particularly since
404 labels are normally only found at function scope. */
405 BOOL_BITFIELD has_label_bindings
: 1;
408 /* The scope currently in effect. */
410 static GTY(()) struct c_scope
*current_scope
;
412 /* The innermost function scope. Ordinary (not explicitly declared)
413 labels, bindings to error_mark_node, and the lazily-created
414 bindings of __func__ and its friends get this scope. */
416 static GTY(()) struct c_scope
*current_function_scope
;
418 /* The C file scope. This is reset for each input translation unit. */
420 static GTY(()) struct c_scope
*file_scope
;
422 /* The outermost scope. This is used for all declarations with
423 external linkage, and only these, hence the name. */
425 static GTY(()) struct c_scope
*external_scope
;
427 /* A chain of c_scope structures awaiting reuse. */
429 static GTY((deletable
)) struct c_scope
*scope_freelist
;
431 /* A chain of c_binding structures awaiting reuse. */
433 static GTY((deletable
)) struct c_binding
*binding_freelist
;
435 /* Append VAR to LIST in scope SCOPE. */
436 #define SCOPE_LIST_APPEND(scope, list, decl) do { \
437 struct c_scope *s_ = (scope); \
439 if (s_->list##_last) \
440 BLOCK_CHAIN (s_->list##_last) = d_; \
443 s_->list##_last = d_; \
446 /* Concatenate FROM in scope FSCOPE onto TO in scope TSCOPE. */
447 #define SCOPE_LIST_CONCAT(tscope, to, fscope, from) do { \
448 struct c_scope *t_ = (tscope); \
449 struct c_scope *f_ = (fscope); \
451 BLOCK_CHAIN (t_->to##_last) = f_->from; \
454 t_->to##_last = f_->from##_last; \
457 /* A c_inline_static structure stores details of a static identifier
458 referenced in a definition of a function that may be an inline
459 definition if no subsequent declaration of that function uses
460 "extern" or does not use "inline". */
462 struct GTY((chain_next ("%h.next"))) c_inline_static
{
463 /* The location for a diagnostic. */
466 /* The function that may be an inline definition. */
469 /* The object or function referenced. */
472 /* What sort of reference this is. */
473 enum c_inline_static_type type
;
475 /* The next such structure or NULL. */
476 struct c_inline_static
*next
;
479 /* List of static identifiers used or referenced in functions that may
480 be inline definitions. */
481 static GTY(()) struct c_inline_static
*c_inline_statics
;
483 /* True means unconditionally make a BLOCK for the next scope pushed. */
485 static bool keep_next_level_flag
;
487 /* True means the next call to push_scope will be the outermost scope
488 of a function body, so do not push a new scope, merely cease
489 expecting parameter decls. */
491 static bool next_is_function_body
;
493 /* A VEC of pointers to c_binding structures. */
495 typedef struct c_binding
*c_binding_ptr
;
496 DEF_VEC_P(c_binding_ptr
);
497 DEF_VEC_ALLOC_P(c_binding_ptr
,heap
);
499 /* Information that we keep for a struct or union while it is being
502 struct c_struct_parse_info
504 /* If warn_cxx_compat, a list of types defined within this
506 VEC(tree
,heap
) *struct_types
;
507 /* If warn_cxx_compat, a list of field names which have bindings,
508 and which are defined in this struct, but which are not defined
509 in any enclosing struct. This is used to clear the in_struct
510 field of the c_bindings structure. */
511 VEC(c_binding_ptr
,heap
) *fields
;
512 /* If warn_cxx_compat, a list of typedef names used when defining
513 fields in this struct. */
514 VEC(tree
,heap
) *typedefs_seen
;
517 /* Information for the struct or union currently being parsed, or
518 NULL if not parsing a struct or union. */
519 static struct c_struct_parse_info
*struct_parse_info
;
521 /* Forward declarations. */
522 static tree
lookup_name_in_scope (tree
, struct c_scope
*);
523 static tree
c_make_fname_decl (location_t
, tree
, int);
524 static tree
grokdeclarator (const struct c_declarator
*,
525 struct c_declspecs
*,
526 enum decl_context
, bool, tree
*, tree
*, tree
*,
527 bool *, enum deprecated_states
);
528 static tree
grokparms (struct c_arg_info
*, bool);
529 static void layout_array_type (tree
);
531 /* T is a statement. Add it to the statement-tree. This is the
532 C/ObjC version--C++ has a slightly different version of this
538 enum tree_code code
= TREE_CODE (t
);
540 if (CAN_HAVE_LOCATION_P (t
) && code
!= LABEL_EXPR
)
542 if (!EXPR_HAS_LOCATION (t
))
543 SET_EXPR_LOCATION (t
, input_location
);
546 if (code
== LABEL_EXPR
|| code
== CASE_LABEL_EXPR
)
547 STATEMENT_LIST_HAS_LABEL (cur_stmt_list
) = 1;
549 /* Add T to the statement-tree. Non-side-effect statements need to be
550 recorded during statement expressions. */
551 append_to_statement_list_force (t
, &cur_stmt_list
);
558 c_print_identifier (FILE *file
, tree node
, int indent
)
560 print_node (file
, "symbol", I_SYMBOL_DECL (node
), indent
+ 4);
561 print_node (file
, "tag", I_TAG_DECL (node
), indent
+ 4);
562 print_node (file
, "label", I_LABEL_DECL (node
), indent
+ 4);
563 if (C_IS_RESERVED_WORD (node
) && C_RID_CODE (node
) != RID_CXX_COMPAT_WARN
)
565 tree rid
= ridpointers
[C_RID_CODE (node
)];
566 indent_to (file
, indent
+ 4);
567 fprintf (file
, "rid " HOST_PTR_PRINTF
" \"%s\"",
568 (void *) rid
, IDENTIFIER_POINTER (rid
));
572 /* Establish a binding between NAME, an IDENTIFIER_NODE, and DECL,
573 which may be any of several kinds of DECL or TYPE or error_mark_node,
574 in the scope SCOPE. */
576 bind (tree name
, tree decl
, struct c_scope
*scope
, bool invisible
,
577 bool nested
, location_t locus
)
579 struct c_binding
*b
, **here
;
581 if (binding_freelist
)
583 b
= binding_freelist
;
584 binding_freelist
= b
->prev
;
587 b
= ggc_alloc_c_binding ();
592 b
->depth
= scope
->depth
;
593 b
->invisible
= invisible
;
601 b
->prev
= scope
->bindings
;
607 switch (TREE_CODE (decl
))
609 case LABEL_DECL
: here
= &I_LABEL_BINDING (name
); break;
612 case RECORD_TYPE
: here
= &I_TAG_BINDING (name
); break;
618 case ERROR_MARK
: here
= &I_SYMBOL_BINDING (name
); break;
624 /* Locate the appropriate place in the chain of shadowed decls
625 to insert this binding. Normally, scope == current_scope and
626 this does nothing. */
627 while (*here
&& (*here
)->depth
> scope
->depth
)
628 here
= &(*here
)->shadowed
;
634 /* Clear the binding structure B, stick it on the binding_freelist,
635 and return the former value of b->prev. This is used by pop_scope
636 and get_parm_info to iterate destructively over all the bindings
637 from a given scope. */
638 static struct c_binding
*
639 free_binding_and_advance (struct c_binding
*b
)
641 struct c_binding
*prev
= b
->prev
;
643 memset (b
, 0, sizeof (struct c_binding
));
644 b
->prev
= binding_freelist
;
645 binding_freelist
= b
;
650 /* Bind a label. Like bind, but skip fields which aren't used for
651 labels, and add the LABEL_VARS value. */
653 bind_label (tree name
, tree label
, struct c_scope
*scope
,
654 struct c_label_vars
*label_vars
)
658 bind (name
, label
, scope
, /*invisible=*/false, /*nested=*/false,
661 scope
->has_label_bindings
= true;
664 gcc_assert (b
->decl
== label
);
665 label_vars
->shadowed
= b
->u
.label
;
666 b
->u
.label
= label_vars
;
669 /* Hook called at end of compilation to assume 1 elt
670 for a file-scope tentative array defn that wasn't complete before. */
673 c_finish_incomplete_decl (tree decl
)
675 if (TREE_CODE (decl
) == VAR_DECL
)
677 tree type
= TREE_TYPE (decl
);
678 if (type
!= error_mark_node
679 && TREE_CODE (type
) == ARRAY_TYPE
680 && !DECL_EXTERNAL (decl
)
681 && TYPE_DOMAIN (type
) == 0)
683 warning_at (DECL_SOURCE_LOCATION (decl
),
684 0, "array %q+D assumed to have one element", decl
);
686 complete_array_type (&TREE_TYPE (decl
), NULL_TREE
, true);
688 layout_decl (decl
, 0);
693 /* Record that inline function FUNC contains a reference (location
694 LOC) to static DECL (file-scope or function-local according to
698 record_inline_static (location_t loc
, tree func
, tree decl
,
699 enum c_inline_static_type type
)
701 struct c_inline_static
*csi
= ggc_alloc_c_inline_static ();
703 csi
->function
= func
;
704 csi
->static_decl
= decl
;
706 csi
->next
= c_inline_statics
;
707 c_inline_statics
= csi
;
710 /* Check for references to static declarations in inline functions at
711 the end of the translation unit and diagnose them if the functions
712 are still inline definitions. */
715 check_inline_statics (void)
717 struct c_inline_static
*csi
;
718 for (csi
= c_inline_statics
; csi
; csi
= csi
->next
)
720 if (DECL_EXTERNAL (csi
->function
))
724 pedwarn (csi
->location
, 0,
725 "%qD is static but used in inline function %qD "
726 "which is not static", csi
->static_decl
, csi
->function
);
729 pedwarn (csi
->location
, 0,
730 "%q+D is static but declared in inline function %qD "
731 "which is not static", csi
->static_decl
, csi
->function
);
737 c_inline_statics
= NULL
;
740 /* Fill in a c_spot_bindings structure. If DEFINING is true, set it
741 for the current state, otherwise set it to uninitialized. */
744 set_spot_bindings (struct c_spot_bindings
*p
, bool defining
)
748 p
->scope
= current_scope
;
749 p
->bindings_in_scope
= current_scope
->bindings
;
754 p
->bindings_in_scope
= NULL
;
757 p
->left_stmt_expr
= false;
760 /* Return true if we will want to say something if a goto statement
764 decl_jump_unsafe (tree decl
)
766 if (decl
== error_mark_node
|| TREE_TYPE (decl
) == error_mark_node
)
769 /* Always warn about crossing variably modified types. */
770 if ((TREE_CODE (decl
) == VAR_DECL
|| TREE_CODE (decl
) == TYPE_DECL
)
771 && variably_modified_type_p (TREE_TYPE (decl
), NULL_TREE
))
774 /* Otherwise, only warn if -Wgoto-misses-init and this is an
775 initialized automatic decl. */
776 if (warn_jump_misses_init
777 && TREE_CODE (decl
) == VAR_DECL
778 && !TREE_STATIC (decl
)
779 && DECL_INITIAL (decl
) != NULL_TREE
)
785 /* Update spot bindings P as we pop out of SCOPE. Return true if we
786 should push decls for a label. */
789 update_spot_bindings (struct c_scope
*scope
, struct c_spot_bindings
*p
)
791 if (p
->scope
!= scope
)
793 /* This label or goto is defined in some other scope, or it is a
794 label which is not yet defined. There is nothing to
799 /* Adjust the spot bindings to refer to the bindings already defined
800 in the enclosing scope. */
801 p
->scope
= scope
->outer
;
802 p
->bindings_in_scope
= p
->scope
->bindings
;
807 /* The Objective-C front-end often needs to determine the current scope. */
810 objc_get_current_scope (void)
812 return current_scope
;
815 /* The following function is used only by Objective-C. It needs to live here
816 because it accesses the innards of c_scope. */
819 objc_mark_locals_volatile (void *enclosing_blk
)
821 struct c_scope
*scope
;
824 for (scope
= current_scope
;
825 scope
&& scope
!= enclosing_blk
;
826 scope
= scope
->outer
)
828 for (b
= scope
->bindings
; b
; b
= b
->prev
)
829 objc_volatilize_decl (b
->decl
);
831 /* Do not climb up past the current function. */
832 if (scope
->function_body
)
837 /* Nonzero if we are currently in file scope. */
840 global_bindings_p (void)
842 return (current_scope
== file_scope
&& !c_override_global_bindings_to_false
848 keep_next_level (void)
850 keep_next_level_flag
= true;
853 /* Set the flag for the FLOAT_CONST_DECIMAL64 pragma being ON. */
856 set_float_const_decimal64 (void)
858 current_scope
->float_const_decimal64
= true;
861 /* Clear the flag for the FLOAT_CONST_DECIMAL64 pragma. */
864 clear_float_const_decimal64 (void)
866 current_scope
->float_const_decimal64
= false;
869 /* Return nonzero if an unsuffixed float constant is _Decimal64. */
872 float_const_decimal64_p (void)
874 return current_scope
->float_const_decimal64
;
877 /* Identify this scope as currently being filled with parameters. */
880 declare_parm_level (void)
882 current_scope
->parm_flag
= true;
888 if (next_is_function_body
)
890 /* This is the transition from the parameters to the top level
891 of the function body. These are the same scope
892 (C99 6.2.1p4,6) so we do not push another scope structure.
893 next_is_function_body is set only by store_parm_decls, which
894 in turn is called when and only when we are about to
895 encounter the opening curly brace for the function body.
897 The outermost block of a function always gets a BLOCK node,
898 because the debugging output routines expect that each
899 function has at least one BLOCK. */
900 current_scope
->parm_flag
= false;
901 current_scope
->function_body
= true;
902 current_scope
->keep
= true;
903 current_scope
->outer_function
= current_function_scope
;
904 current_function_scope
= current_scope
;
906 keep_next_level_flag
= false;
907 next_is_function_body
= false;
909 /* The FLOAT_CONST_DECIMAL64 pragma applies to nested scopes. */
910 if (current_scope
->outer
)
911 current_scope
->float_const_decimal64
912 = current_scope
->outer
->float_const_decimal64
;
914 current_scope
->float_const_decimal64
= false;
918 struct c_scope
*scope
;
921 scope
= scope_freelist
;
922 scope_freelist
= scope
->outer
;
925 scope
= ggc_alloc_cleared_c_scope ();
927 /* The FLOAT_CONST_DECIMAL64 pragma applies to nested scopes. */
929 scope
->float_const_decimal64
= current_scope
->float_const_decimal64
;
931 scope
->float_const_decimal64
= false;
933 scope
->keep
= keep_next_level_flag
;
934 scope
->outer
= current_scope
;
935 scope
->depth
= current_scope
? (current_scope
->depth
+ 1) : 0;
937 /* Check for scope depth overflow. Unlikely (2^28 == 268,435,456) but
939 if (current_scope
&& scope
->depth
== 0)
942 sorry ("GCC supports only %u nested scopes", scope
->depth
);
945 current_scope
= scope
;
946 keep_next_level_flag
= false;
950 /* This is called when we are leaving SCOPE. For each label defined
951 in SCOPE, add any appropriate decls to its decls_in_scope fields.
952 These are the decls whose initialization will be skipped by a goto
953 later in the function. */
956 update_label_decls (struct c_scope
*scope
)
963 if (s
->has_label_bindings
)
967 for (b
= s
->bindings
; b
!= NULL
; b
= b
->prev
)
969 struct c_label_vars
*label_vars
;
970 struct c_binding
*b1
;
972 struct c_goto_bindings
*g
;
974 if (TREE_CODE (b
->decl
) != LABEL_DECL
)
976 label_vars
= b
->u
.label
;
978 b1
= label_vars
->label_bindings
.bindings_in_scope
;
979 if (update_spot_bindings (scope
, &label_vars
->label_bindings
))
981 /* This label is defined in this scope. */
982 for (; b1
!= NULL
; b1
= b1
->prev
)
984 /* A goto from later in the function to this
985 label will never see the initialization of
986 B1, if any. Save it to issue a warning if
988 if (decl_jump_unsafe (b1
->decl
))
989 VEC_safe_push (tree
, gc
, label_vars
->decls_in_scope
,
994 /* Update the bindings of any goto statements associated
996 FOR_EACH_VEC_ELT (c_goto_bindings_p
, label_vars
->gotos
, ix
, g
)
997 update_spot_bindings (scope
, &g
->goto_bindings
);
1001 /* Don't search beyond the current function. */
1002 if (s
== current_function_scope
)
1009 /* Set the TYPE_CONTEXT of all of TYPE's variants to CONTEXT. */
1012 set_type_context (tree type
, tree context
)
1014 for (type
= TYPE_MAIN_VARIANT (type
); type
;
1015 type
= TYPE_NEXT_VARIANT (type
))
1016 TYPE_CONTEXT (type
) = context
;
1019 /* Exit a scope. Restore the state of the identifier-decl mappings
1020 that were in effect when this scope was entered. Return a BLOCK
1021 node containing all the DECLs in this scope that are of interest
1022 to debug info generation. */
1027 struct c_scope
*scope
= current_scope
;
1028 tree block
, context
, p
;
1029 struct c_binding
*b
;
1031 bool functionbody
= scope
->function_body
;
1032 bool keep
= functionbody
|| scope
->keep
|| scope
->bindings
;
1034 update_label_decls (scope
);
1036 /* If appropriate, create a BLOCK to record the decls for the life
1037 of this function. */
1041 block
= make_node (BLOCK
);
1042 BLOCK_SUBBLOCKS (block
) = scope
->blocks
;
1043 TREE_USED (block
) = 1;
1045 /* In each subblock, record that this is its superior. */
1046 for (p
= scope
->blocks
; p
; p
= BLOCK_CHAIN (p
))
1047 BLOCK_SUPERCONTEXT (p
) = block
;
1049 BLOCK_VARS (block
) = 0;
1052 /* The TYPE_CONTEXTs for all of the tagged types belonging to this
1053 scope must be set so that they point to the appropriate
1054 construct, i.e. either to the current FUNCTION_DECL node, or
1055 else to the BLOCK node we just constructed.
1057 Note that for tagged types whose scope is just the formal
1058 parameter list for some function type specification, we can't
1059 properly set their TYPE_CONTEXTs here, because we don't have a
1060 pointer to the appropriate FUNCTION_TYPE node readily available
1061 to us. For those cases, the TYPE_CONTEXTs of the relevant tagged
1062 type nodes get set in `grokdeclarator' as soon as we have created
1063 the FUNCTION_TYPE node which will represent the "scope" for these
1064 "parameter list local" tagged types. */
1065 if (scope
->function_body
)
1066 context
= current_function_decl
;
1067 else if (scope
== file_scope
)
1069 tree file_decl
= build_translation_unit_decl (NULL_TREE
);
1070 context
= file_decl
;
1075 /* Clear all bindings in this scope. */
1076 for (b
= scope
->bindings
; b
; b
= free_binding_and_advance (b
))
1079 switch (TREE_CODE (p
))
1082 /* Warnings for unused labels, errors for undefined labels. */
1083 if (TREE_USED (p
) && !DECL_INITIAL (p
))
1085 error ("label %q+D used but not defined", p
);
1086 DECL_INITIAL (p
) = error_mark_node
;
1089 warn_for_unused_label (p
);
1091 /* Labels go in BLOCK_VARS. */
1092 DECL_CHAIN (p
) = BLOCK_VARS (block
);
1093 BLOCK_VARS (block
) = p
;
1094 gcc_assert (I_LABEL_BINDING (b
->id
) == b
);
1095 I_LABEL_BINDING (b
->id
) = b
->shadowed
;
1097 /* Also pop back to the shadowed label_vars. */
1098 release_tree_vector (b
->u
.label
->decls_in_scope
);
1099 b
->u
.label
= b
->u
.label
->shadowed
;
1105 set_type_context (p
, context
);
1107 /* Types may not have tag-names, in which case the type
1108 appears in the bindings list with b->id NULL. */
1111 gcc_assert (I_TAG_BINDING (b
->id
) == b
);
1112 I_TAG_BINDING (b
->id
) = b
->shadowed
;
1117 /* Propagate TREE_ADDRESSABLE from nested functions to their
1118 containing functions. */
1119 if (!TREE_ASM_WRITTEN (p
)
1120 && DECL_INITIAL (p
) != 0
1121 && TREE_ADDRESSABLE (p
)
1122 && DECL_ABSTRACT_ORIGIN (p
) != 0
1123 && DECL_ABSTRACT_ORIGIN (p
) != p
)
1124 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (p
)) = 1;
1125 if (!DECL_EXTERNAL (p
)
1126 && !DECL_INITIAL (p
)
1127 && scope
!= file_scope
1128 && scope
!= external_scope
)
1130 error ("nested function %q+D declared but never defined", p
);
1131 undef_nested_function
= true;
1133 else if (DECL_DECLARED_INLINE_P (p
)
1135 && !DECL_INITIAL (p
))
1137 /* C99 6.7.4p6: "a function with external linkage... declared
1138 with an inline function specifier ... shall also be defined
1139 in the same translation unit." */
1140 if (!flag_gnu89_inline
)
1141 pedwarn (input_location
, 0,
1142 "inline function %q+D declared but never defined", p
);
1143 DECL_EXTERNAL (p
) = 1;
1149 /* Warnings for unused variables. */
1150 if ((!TREE_USED (p
) || !DECL_READ_P (p
))
1151 && !TREE_NO_WARNING (p
)
1152 && !DECL_IN_SYSTEM_HEADER (p
)
1154 && !DECL_ARTIFICIAL (p
)
1155 && scope
!= file_scope
1156 && scope
!= external_scope
)
1159 warning (OPT_Wunused_variable
, "unused variable %q+D", p
);
1160 else if (DECL_CONTEXT (p
) == current_function_decl
)
1161 warning_at (DECL_SOURCE_LOCATION (p
),
1162 OPT_Wunused_but_set_variable
,
1163 "variable %qD set but not used", p
);
1168 error ("type of array %q+D completed incompatibly with"
1169 " implicit initialization", p
);
1176 /* All of these go in BLOCK_VARS, but only if this is the
1177 binding in the home scope. */
1180 DECL_CHAIN (p
) = BLOCK_VARS (block
);
1181 BLOCK_VARS (block
) = p
;
1183 else if (VAR_OR_FUNCTION_DECL_P (p
))
1185 /* For block local externs add a special
1186 DECL_EXTERNAL decl for debug info generation. */
1187 tree extp
= copy_node (p
);
1189 DECL_EXTERNAL (extp
) = 1;
1190 TREE_STATIC (extp
) = 0;
1191 TREE_PUBLIC (extp
) = 1;
1192 DECL_INITIAL (extp
) = NULL_TREE
;
1193 DECL_LANG_SPECIFIC (extp
) = NULL
;
1194 DECL_CONTEXT (extp
) = current_function_decl
;
1195 if (TREE_CODE (p
) == FUNCTION_DECL
)
1197 DECL_RESULT (extp
) = NULL_TREE
;
1198 DECL_SAVED_TREE (extp
) = NULL_TREE
;
1199 DECL_STRUCT_FUNCTION (extp
) = NULL
;
1201 if (b
->locus
!= UNKNOWN_LOCATION
)
1202 DECL_SOURCE_LOCATION (extp
) = b
->locus
;
1203 DECL_CHAIN (extp
) = BLOCK_VARS (block
);
1204 BLOCK_VARS (block
) = extp
;
1206 /* If this is the file scope set DECL_CONTEXT of each decl to
1207 the TRANSLATION_UNIT_DECL. This makes same_translation_unit_p
1209 if (scope
== file_scope
)
1211 DECL_CONTEXT (p
) = context
;
1212 if (TREE_CODE (p
) == TYPE_DECL
1213 && TREE_TYPE (p
) != error_mark_node
)
1214 set_type_context (TREE_TYPE (p
), context
);
1218 /* Parameters go in DECL_ARGUMENTS, not BLOCK_VARS, and have
1219 already been put there by store_parm_decls. Unused-
1220 parameter warnings are handled by function.c.
1221 error_mark_node obviously does not go in BLOCK_VARS and
1222 does not get unused-variable warnings. */
1225 /* It is possible for a decl not to have a name. We get
1226 here with b->id NULL in this case. */
1229 gcc_assert (I_SYMBOL_BINDING (b
->id
) == b
);
1230 I_SYMBOL_BINDING (b
->id
) = b
->shadowed
;
1231 if (b
->shadowed
&& b
->shadowed
->u
.type
)
1232 TREE_TYPE (b
->shadowed
->decl
) = b
->shadowed
->u
.type
;
1242 /* Dispose of the block that we just made inside some higher level. */
1243 if ((scope
->function_body
|| scope
== file_scope
) && context
)
1245 DECL_INITIAL (context
) = block
;
1246 BLOCK_SUPERCONTEXT (block
) = context
;
1248 else if (scope
->outer
)
1251 SCOPE_LIST_APPEND (scope
->outer
, blocks
, block
);
1252 /* If we did not make a block for the scope just exited, any
1253 blocks made for inner scopes must be carried forward so they
1254 will later become subblocks of something else. */
1255 else if (scope
->blocks
)
1256 SCOPE_LIST_CONCAT (scope
->outer
, blocks
, scope
, blocks
);
1259 /* Pop the current scope, and free the structure for reuse. */
1260 current_scope
= scope
->outer
;
1261 if (scope
->function_body
)
1262 current_function_scope
= scope
->outer_function
;
1264 memset (scope
, 0, sizeof (struct c_scope
));
1265 scope
->outer
= scope_freelist
;
1266 scope_freelist
= scope
;
1272 push_file_scope (void)
1280 file_scope
= current_scope
;
1282 start_fname_decls ();
1284 for (decl
= visible_builtins
; decl
; decl
= DECL_CHAIN (decl
))
1285 bind (DECL_NAME (decl
), decl
, file_scope
,
1286 /*invisible=*/false, /*nested=*/true, DECL_SOURCE_LOCATION (decl
));
1290 pop_file_scope (void)
1292 /* In case there were missing closebraces, get us back to the global
1294 while (current_scope
!= file_scope
)
1297 /* __FUNCTION__ is defined at file scope (""). This
1298 call may not be necessary as my tests indicate it
1299 still works without it. */
1300 finish_fname_decls ();
1302 check_inline_statics ();
1304 /* This is the point to write out a PCH if we're doing that.
1305 In that case we do not want to do anything else. */
1308 c_common_write_pch ();
1312 /* Pop off the file scope and close this translation unit. */
1316 maybe_apply_pending_pragma_weaks ();
1319 /* Adjust the bindings for the start of a statement expression. */
1322 c_bindings_start_stmt_expr (struct c_spot_bindings
* switch_bindings
)
1324 struct c_scope
*scope
;
1326 for (scope
= current_scope
; scope
!= NULL
; scope
= scope
->outer
)
1328 struct c_binding
*b
;
1330 if (!scope
->has_label_bindings
)
1333 for (b
= scope
->bindings
; b
!= NULL
; b
= b
->prev
)
1335 struct c_label_vars
*label_vars
;
1337 struct c_goto_bindings
*g
;
1339 if (TREE_CODE (b
->decl
) != LABEL_DECL
)
1341 label_vars
= b
->u
.label
;
1342 ++label_vars
->label_bindings
.stmt_exprs
;
1343 FOR_EACH_VEC_ELT (c_goto_bindings_p
, label_vars
->gotos
, ix
, g
)
1344 ++g
->goto_bindings
.stmt_exprs
;
1348 if (switch_bindings
!= NULL
)
1349 ++switch_bindings
->stmt_exprs
;
1352 /* Adjust the bindings for the end of a statement expression. */
1355 c_bindings_end_stmt_expr (struct c_spot_bindings
*switch_bindings
)
1357 struct c_scope
*scope
;
1359 for (scope
= current_scope
; scope
!= NULL
; scope
= scope
->outer
)
1361 struct c_binding
*b
;
1363 if (!scope
->has_label_bindings
)
1366 for (b
= scope
->bindings
; b
!= NULL
; b
= b
->prev
)
1368 struct c_label_vars
*label_vars
;
1370 struct c_goto_bindings
*g
;
1372 if (TREE_CODE (b
->decl
) != LABEL_DECL
)
1374 label_vars
= b
->u
.label
;
1375 --label_vars
->label_bindings
.stmt_exprs
;
1376 if (label_vars
->label_bindings
.stmt_exprs
< 0)
1378 label_vars
->label_bindings
.left_stmt_expr
= true;
1379 label_vars
->label_bindings
.stmt_exprs
= 0;
1381 FOR_EACH_VEC_ELT (c_goto_bindings_p
, label_vars
->gotos
, ix
, g
)
1383 --g
->goto_bindings
.stmt_exprs
;
1384 if (g
->goto_bindings
.stmt_exprs
< 0)
1386 g
->goto_bindings
.left_stmt_expr
= true;
1387 g
->goto_bindings
.stmt_exprs
= 0;
1393 if (switch_bindings
!= NULL
)
1395 --switch_bindings
->stmt_exprs
;
1396 gcc_assert (switch_bindings
->stmt_exprs
>= 0);
1400 /* Push a definition or a declaration of struct, union or enum tag "name".
1401 "type" should be the type node.
1402 We assume that the tag "name" is not already defined, and has a location
1405 Note that the definition may really be just a forward reference.
1406 In that case, the TYPE_SIZE will be zero. */
1409 pushtag (location_t loc
, tree name
, tree type
)
1411 /* Record the identifier as the type's name if it has none. */
1412 if (name
&& !TYPE_NAME (type
))
1413 TYPE_NAME (type
) = name
;
1414 bind (name
, type
, current_scope
, /*invisible=*/false, /*nested=*/false, loc
);
1416 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1417 tagged type we just added to the current scope. This fake
1418 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1419 to output a representation of a tagged type, and it also gives
1420 us a convenient place to record the "scope start" address for the
1423 TYPE_STUB_DECL (type
) = pushdecl (build_decl (loc
,
1424 TYPE_DECL
, NULL_TREE
, type
));
1426 /* An approximation for now, so we can tell this is a function-scope tag.
1427 This will be updated in pop_scope. */
1428 TYPE_CONTEXT (type
) = DECL_CONTEXT (TYPE_STUB_DECL (type
));
1430 if (warn_cxx_compat
&& name
!= NULL_TREE
)
1432 struct c_binding
*b
= I_SYMBOL_BINDING (name
);
1435 && b
->decl
!= NULL_TREE
1436 && TREE_CODE (b
->decl
) == TYPE_DECL
1437 && (B_IN_CURRENT_SCOPE (b
)
1438 || (current_scope
== file_scope
&& B_IN_EXTERNAL_SCOPE (b
)))
1439 && (TYPE_MAIN_VARIANT (TREE_TYPE (b
->decl
))
1440 != TYPE_MAIN_VARIANT (type
)))
1442 warning_at (loc
, OPT_Wc___compat
,
1443 ("using %qD as both a typedef and a tag is "
1446 if (b
->locus
!= UNKNOWN_LOCATION
)
1447 inform (b
->locus
, "originally defined here");
1452 /* Subroutine of compare_decls. Allow harmless mismatches in return
1453 and argument types provided that the type modes match. This function
1454 return a unified type given a suitable match, and 0 otherwise. */
1457 match_builtin_function_types (tree newtype
, tree oldtype
)
1459 tree newrettype
, oldrettype
;
1460 tree newargs
, oldargs
;
1461 tree trytype
, tryargs
;
1463 /* Accept the return type of the new declaration if same modes. */
1464 oldrettype
= TREE_TYPE (oldtype
);
1465 newrettype
= TREE_TYPE (newtype
);
1467 if (TYPE_MODE (oldrettype
) != TYPE_MODE (newrettype
))
1470 oldargs
= TYPE_ARG_TYPES (oldtype
);
1471 newargs
= TYPE_ARG_TYPES (newtype
);
1474 while (oldargs
|| newargs
)
1478 || !TREE_VALUE (oldargs
)
1479 || !TREE_VALUE (newargs
)
1480 || TYPE_MODE (TREE_VALUE (oldargs
))
1481 != TYPE_MODE (TREE_VALUE (newargs
)))
1484 oldargs
= TREE_CHAIN (oldargs
);
1485 newargs
= TREE_CHAIN (newargs
);
1488 trytype
= build_function_type (newrettype
, tryargs
);
1489 return build_type_attribute_variant (trytype
, TYPE_ATTRIBUTES (oldtype
));
1492 /* Subroutine of diagnose_mismatched_decls. Check for function type
1493 mismatch involving an empty arglist vs a nonempty one and give clearer
1496 diagnose_arglist_conflict (tree newdecl
, tree olddecl
,
1497 tree newtype
, tree oldtype
)
1501 if (TREE_CODE (olddecl
) != FUNCTION_DECL
1502 || !comptypes (TREE_TYPE (oldtype
), TREE_TYPE (newtype
))
1503 || !((TYPE_ARG_TYPES (oldtype
) == 0 && DECL_INITIAL (olddecl
) == 0)
1505 (TYPE_ARG_TYPES (newtype
) == 0 && DECL_INITIAL (newdecl
) == 0)))
1508 t
= TYPE_ARG_TYPES (oldtype
);
1510 t
= TYPE_ARG_TYPES (newtype
);
1511 for (; t
; t
= TREE_CHAIN (t
))
1513 tree type
= TREE_VALUE (t
);
1515 if (TREE_CHAIN (t
) == 0
1516 && TYPE_MAIN_VARIANT (type
) != void_type_node
)
1518 inform (input_location
, "a parameter list with an ellipsis can%'t match "
1519 "an empty parameter name list declaration");
1523 if (c_type_promotes_to (type
) != type
)
1525 inform (input_location
, "an argument type that has a default promotion can%'t match "
1526 "an empty parameter name list declaration");
1532 /* Another subroutine of diagnose_mismatched_decls. OLDDECL is an
1533 old-style function definition, NEWDECL is a prototype declaration.
1534 Diagnose inconsistencies in the argument list. Returns TRUE if
1535 the prototype is compatible, FALSE if not. */
1537 validate_proto_after_old_defn (tree newdecl
, tree newtype
, tree oldtype
)
1539 tree newargs
, oldargs
;
1542 #define END_OF_ARGLIST(t) ((t) == void_type_node)
1544 oldargs
= TYPE_ACTUAL_ARG_TYPES (oldtype
);
1545 newargs
= TYPE_ARG_TYPES (newtype
);
1550 tree oldargtype
= TREE_VALUE (oldargs
);
1551 tree newargtype
= TREE_VALUE (newargs
);
1553 if (oldargtype
== error_mark_node
|| newargtype
== error_mark_node
)
1556 oldargtype
= TYPE_MAIN_VARIANT (oldargtype
);
1557 newargtype
= TYPE_MAIN_VARIANT (newargtype
);
1559 if (END_OF_ARGLIST (oldargtype
) && END_OF_ARGLIST (newargtype
))
1562 /* Reaching the end of just one list means the two decls don't
1563 agree on the number of arguments. */
1564 if (END_OF_ARGLIST (oldargtype
))
1566 error ("prototype for %q+D declares more arguments "
1567 "than previous old-style definition", newdecl
);
1570 else if (END_OF_ARGLIST (newargtype
))
1572 error ("prototype for %q+D declares fewer arguments "
1573 "than previous old-style definition", newdecl
);
1577 /* Type for passing arg must be consistent with that declared
1579 else if (!comptypes (oldargtype
, newargtype
))
1581 error ("prototype for %q+D declares argument %d"
1582 " with incompatible type",
1587 oldargs
= TREE_CHAIN (oldargs
);
1588 newargs
= TREE_CHAIN (newargs
);
1592 /* If we get here, no errors were found, but do issue a warning
1593 for this poor-style construct. */
1594 warning (0, "prototype for %q+D follows non-prototype definition",
1597 #undef END_OF_ARGLIST
1600 /* Subroutine of diagnose_mismatched_decls. Report the location of DECL,
1601 first in a pair of mismatched declarations, using the diagnostic
1604 locate_old_decl (tree decl
)
1606 if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_BUILT_IN (decl
))
1608 else if (DECL_INITIAL (decl
))
1609 inform (input_location
, "previous definition of %q+D was here", decl
);
1610 else if (C_DECL_IMPLICIT (decl
))
1611 inform (input_location
, "previous implicit declaration of %q+D was here", decl
);
1613 inform (input_location
, "previous declaration of %q+D was here", decl
);
1616 /* Subroutine of duplicate_decls. Compare NEWDECL to OLDDECL.
1617 Returns true if the caller should proceed to merge the two, false
1618 if OLDDECL should simply be discarded. As a side effect, issues
1619 all necessary diagnostics for invalid or poor-style combinations.
1620 If it returns true, writes the types of NEWDECL and OLDDECL to
1621 *NEWTYPEP and *OLDTYPEP - these may have been adjusted from
1622 TREE_TYPE (NEWDECL, OLDDECL) respectively. */
1625 diagnose_mismatched_decls (tree newdecl
, tree olddecl
,
1626 tree
*newtypep
, tree
*oldtypep
)
1628 tree newtype
, oldtype
;
1629 bool pedwarned
= false;
1630 bool warned
= false;
1633 #define DECL_EXTERN_INLINE(DECL) (DECL_DECLARED_INLINE_P (DECL) \
1634 && DECL_EXTERNAL (DECL))
1636 /* If we have error_mark_node for either decl or type, just discard
1637 the previous decl - we're in an error cascade already. */
1638 if (olddecl
== error_mark_node
|| newdecl
== error_mark_node
)
1640 *oldtypep
= oldtype
= TREE_TYPE (olddecl
);
1641 *newtypep
= newtype
= TREE_TYPE (newdecl
);
1642 if (oldtype
== error_mark_node
|| newtype
== error_mark_node
)
1645 /* Two different categories of symbol altogether. This is an error
1646 unless OLDDECL is a builtin. OLDDECL will be discarded in any case. */
1647 if (TREE_CODE (olddecl
) != TREE_CODE (newdecl
))
1649 if (!(TREE_CODE (olddecl
) == FUNCTION_DECL
1650 && DECL_BUILT_IN (olddecl
)
1651 && !C_DECL_DECLARED_BUILTIN (olddecl
)))
1653 error ("%q+D redeclared as different kind of symbol", newdecl
);
1654 locate_old_decl (olddecl
);
1656 else if (TREE_PUBLIC (newdecl
))
1657 warning (0, "built-in function %q+D declared as non-function",
1660 warning (OPT_Wshadow
, "declaration of %q+D shadows "
1661 "a built-in function", newdecl
);
1665 /* Enumerators have no linkage, so may only be declared once in a
1667 if (TREE_CODE (olddecl
) == CONST_DECL
)
1669 error ("redeclaration of enumerator %q+D", newdecl
);
1670 locate_old_decl (olddecl
);
1674 if (!comptypes (oldtype
, newtype
))
1676 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1677 && DECL_BUILT_IN (olddecl
) && !C_DECL_DECLARED_BUILTIN (olddecl
))
1679 /* Accept harmless mismatch in function types.
1680 This is for the ffs and fprintf builtins. */
1681 tree trytype
= match_builtin_function_types (newtype
, oldtype
);
1683 if (trytype
&& comptypes (newtype
, trytype
))
1684 *oldtypep
= oldtype
= trytype
;
1687 /* If types don't match for a built-in, throw away the
1688 built-in. No point in calling locate_old_decl here, it
1689 won't print anything. */
1690 warning (0, "conflicting types for built-in function %q+D",
1695 else if (TREE_CODE (olddecl
) == FUNCTION_DECL
1696 && DECL_IS_BUILTIN (olddecl
))
1698 /* A conflicting function declaration for a predeclared
1699 function that isn't actually built in. Objective C uses
1700 these. The new declaration silently overrides everything
1701 but the volatility (i.e. noreturn) indication. See also
1702 below. FIXME: Make Objective C use normal builtins. */
1703 TREE_THIS_VOLATILE (newdecl
) |= TREE_THIS_VOLATILE (olddecl
);
1706 /* Permit void foo (...) to match int foo (...) if the latter is
1707 the definition and implicit int was used. See
1708 c-torture/compile/920625-2.c. */
1709 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
&& DECL_INITIAL (newdecl
)
1710 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype
)) == void_type_node
1711 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype
)) == integer_type_node
1712 && C_FUNCTION_IMPLICIT_INT (newdecl
) && !DECL_INITIAL (olddecl
))
1714 pedwarned
= pedwarn (input_location
, 0,
1715 "conflicting types for %q+D", newdecl
);
1716 /* Make sure we keep void as the return type. */
1717 TREE_TYPE (newdecl
) = *newtypep
= newtype
= oldtype
;
1718 C_FUNCTION_IMPLICIT_INT (newdecl
) = 0;
1720 /* Permit void foo (...) to match an earlier call to foo (...) with
1721 no declared type (thus, implicitly int). */
1722 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
1723 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype
)) == void_type_node
1724 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype
)) == integer_type_node
1725 && C_DECL_IMPLICIT (olddecl
) && !DECL_INITIAL (olddecl
))
1727 pedwarned
= pedwarn (input_location
, 0,
1728 "conflicting types for %q+D", newdecl
);
1729 /* Make sure we keep void as the return type. */
1730 TREE_TYPE (olddecl
) = *oldtypep
= oldtype
= newtype
;
1734 int new_quals
= TYPE_QUALS (newtype
);
1735 int old_quals
= TYPE_QUALS (oldtype
);
1737 if (new_quals
!= old_quals
)
1739 addr_space_t new_addr
= DECODE_QUAL_ADDR_SPACE (new_quals
);
1740 addr_space_t old_addr
= DECODE_QUAL_ADDR_SPACE (old_quals
);
1741 if (new_addr
!= old_addr
)
1743 if (ADDR_SPACE_GENERIC_P (new_addr
))
1744 error ("conflicting named address spaces (generic vs %s) "
1746 c_addr_space_name (old_addr
), newdecl
);
1747 else if (ADDR_SPACE_GENERIC_P (old_addr
))
1748 error ("conflicting named address spaces (%s vs generic) "
1750 c_addr_space_name (new_addr
), newdecl
);
1752 error ("conflicting named address spaces (%s vs %s) "
1754 c_addr_space_name (new_addr
),
1755 c_addr_space_name (old_addr
),
1759 if (CLEAR_QUAL_ADDR_SPACE (new_quals
)
1760 != CLEAR_QUAL_ADDR_SPACE (old_quals
))
1761 error ("conflicting type qualifiers for %q+D", newdecl
);
1764 error ("conflicting types for %q+D", newdecl
);
1765 diagnose_arglist_conflict (newdecl
, olddecl
, newtype
, oldtype
);
1766 locate_old_decl (olddecl
);
1771 /* Redeclaration of a type is a constraint violation (6.7.2.3p1),
1772 but silently ignore the redeclaration if either is in a system
1773 header. (Conflicting redeclarations were handled above.) This
1774 is allowed for C1X if the types are the same, not just
1776 if (TREE_CODE (newdecl
) == TYPE_DECL
)
1778 bool types_different
= false;
1779 int comptypes_result
;
1782 = comptypes_check_different_types (oldtype
, newtype
, &types_different
);
1784 if (comptypes_result
!= 1 || types_different
)
1786 error ("redefinition of typedef %q+D with different type", newdecl
);
1787 locate_old_decl (olddecl
);
1791 if (DECL_IN_SYSTEM_HEADER (newdecl
)
1792 || DECL_IN_SYSTEM_HEADER (olddecl
)
1793 || TREE_NO_WARNING (newdecl
)
1794 || TREE_NO_WARNING (olddecl
))
1795 return true; /* Allow OLDDECL to continue in use. */
1797 if (pedantic
&& !flag_isoc1x
)
1799 pedwarn (input_location
, OPT_pedantic
,
1800 "redefinition of typedef %q+D", newdecl
);
1801 locate_old_decl (olddecl
);
1803 else if (variably_modified_type_p (newtype
, NULL
))
1805 /* Whether there is a constraint violation for the types not
1806 being the same cannot be determined at compile time; a
1807 warning that there may be one at runtime is considered
1808 appropriate (WG14 reflector message 11743, 8 May 2009). */
1809 warning (0, "redefinition of typedef %q+D may be a constraint "
1810 "violation at runtime", newdecl
);
1811 locate_old_decl (olddecl
);
1817 /* Function declarations can either be 'static' or 'extern' (no
1818 qualifier is equivalent to 'extern' - C99 6.2.2p5) and therefore
1819 can never conflict with each other on account of linkage
1820 (6.2.2p4). Multiple definitions are not allowed (6.9p3,5) but
1821 gnu89 mode permits two definitions if one is 'extern inline' and
1822 one is not. The non- extern-inline definition supersedes the
1823 extern-inline definition. */
1825 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1827 /* If you declare a built-in function name as static, or
1828 define the built-in with an old-style definition (so we
1829 can't validate the argument list) the built-in definition is
1830 overridden, but optionally warn this was a bad choice of name. */
1831 if (DECL_BUILT_IN (olddecl
)
1832 && !C_DECL_DECLARED_BUILTIN (olddecl
)
1833 && (!TREE_PUBLIC (newdecl
)
1834 || (DECL_INITIAL (newdecl
)
1835 && !TYPE_ARG_TYPES (TREE_TYPE (newdecl
)))))
1837 warning (OPT_Wshadow
, "declaration of %q+D shadows "
1838 "a built-in function", newdecl
);
1839 /* Discard the old built-in function. */
1843 if (DECL_INITIAL (newdecl
))
1845 if (DECL_INITIAL (olddecl
))
1847 /* If both decls are in the same TU and the new declaration
1848 isn't overriding an extern inline reject the new decl.
1849 In c99, no overriding is allowed in the same translation
1851 if ((!DECL_EXTERN_INLINE (olddecl
)
1852 || DECL_EXTERN_INLINE (newdecl
)
1853 || (!flag_gnu89_inline
1854 && (!DECL_DECLARED_INLINE_P (olddecl
)
1855 || !lookup_attribute ("gnu_inline",
1856 DECL_ATTRIBUTES (olddecl
)))
1857 && (!DECL_DECLARED_INLINE_P (newdecl
)
1858 || !lookup_attribute ("gnu_inline",
1859 DECL_ATTRIBUTES (newdecl
))))
1861 && same_translation_unit_p (newdecl
, olddecl
))
1863 error ("redefinition of %q+D", newdecl
);
1864 locate_old_decl (olddecl
);
1869 /* If we have a prototype after an old-style function definition,
1870 the argument types must be checked specially. */
1871 else if (DECL_INITIAL (olddecl
)
1872 && !TYPE_ARG_TYPES (oldtype
) && TYPE_ARG_TYPES (newtype
)
1873 && TYPE_ACTUAL_ARG_TYPES (oldtype
)
1874 && !validate_proto_after_old_defn (newdecl
, newtype
, oldtype
))
1876 locate_old_decl (olddecl
);
1879 /* A non-static declaration (even an "extern") followed by a
1880 static declaration is undefined behavior per C99 6.2.2p3-5,7.
1881 The same is true for a static forward declaration at block
1882 scope followed by a non-static declaration/definition at file
1883 scope. Static followed by non-static at the same scope is
1884 not undefined behavior, and is the most convenient way to get
1885 some effects (see e.g. what unwind-dw2-fde-glibc.c does to
1886 the definition of _Unwind_Find_FDE in unwind-dw2-fde.c), but
1887 we do diagnose it if -Wtraditional. */
1888 if (TREE_PUBLIC (olddecl
) && !TREE_PUBLIC (newdecl
))
1890 /* Two exceptions to the rule. If olddecl is an extern
1891 inline, or a predeclared function that isn't actually
1892 built in, newdecl silently overrides olddecl. The latter
1893 occur only in Objective C; see also above. (FIXME: Make
1894 Objective C use normal builtins.) */
1895 if (!DECL_IS_BUILTIN (olddecl
)
1896 && !DECL_EXTERN_INLINE (olddecl
))
1898 error ("static declaration of %q+D follows "
1899 "non-static declaration", newdecl
);
1900 locate_old_decl (olddecl
);
1904 else if (TREE_PUBLIC (newdecl
) && !TREE_PUBLIC (olddecl
))
1906 if (DECL_CONTEXT (olddecl
))
1908 error ("non-static declaration of %q+D follows "
1909 "static declaration", newdecl
);
1910 locate_old_decl (olddecl
);
1913 else if (warn_traditional
)
1915 warned
|= warning (OPT_Wtraditional
,
1916 "non-static declaration of %q+D "
1917 "follows static declaration", newdecl
);
1921 /* Make sure gnu_inline attribute is either not present, or
1922 present on all inline decls. */
1923 if (DECL_DECLARED_INLINE_P (olddecl
)
1924 && DECL_DECLARED_INLINE_P (newdecl
))
1926 bool newa
= lookup_attribute ("gnu_inline",
1927 DECL_ATTRIBUTES (newdecl
)) != NULL
;
1928 bool olda
= lookup_attribute ("gnu_inline",
1929 DECL_ATTRIBUTES (olddecl
)) != NULL
;
1932 error_at (input_location
, "%<gnu_inline%> attribute present on %q+D",
1933 newa
? newdecl
: olddecl
);
1934 error_at (DECL_SOURCE_LOCATION (newa
? olddecl
: newdecl
),
1939 else if (TREE_CODE (newdecl
) == VAR_DECL
)
1941 /* Only variables can be thread-local, and all declarations must
1942 agree on this property. */
1943 if (C_DECL_THREADPRIVATE_P (olddecl
) && !DECL_THREAD_LOCAL_P (newdecl
))
1945 /* Nothing to check. Since OLDDECL is marked threadprivate
1946 and NEWDECL does not have a thread-local attribute, we
1947 will merge the threadprivate attribute into NEWDECL. */
1950 else if (DECL_THREAD_LOCAL_P (newdecl
) != DECL_THREAD_LOCAL_P (olddecl
))
1952 if (DECL_THREAD_LOCAL_P (newdecl
))
1953 error ("thread-local declaration of %q+D follows "
1954 "non-thread-local declaration", newdecl
);
1956 error ("non-thread-local declaration of %q+D follows "
1957 "thread-local declaration", newdecl
);
1959 locate_old_decl (olddecl
);
1963 /* Multiple initialized definitions are not allowed (6.9p3,5). */
1964 if (DECL_INITIAL (newdecl
) && DECL_INITIAL (olddecl
))
1966 error ("redefinition of %q+D", newdecl
);
1967 locate_old_decl (olddecl
);
1971 /* Objects declared at file scope: if the first declaration had
1972 external linkage (even if it was an external reference) the
1973 second must have external linkage as well, or the behavior is
1974 undefined. If the first declaration had internal linkage, then
1975 the second must too, or else be an external reference (in which
1976 case the composite declaration still has internal linkage).
1977 As for function declarations, we warn about the static-then-
1978 extern case only for -Wtraditional. See generally 6.2.2p3-5,7. */
1979 if (DECL_FILE_SCOPE_P (newdecl
)
1980 && TREE_PUBLIC (newdecl
) != TREE_PUBLIC (olddecl
))
1982 if (DECL_EXTERNAL (newdecl
))
1984 if (!DECL_FILE_SCOPE_P (olddecl
))
1986 error ("extern declaration of %q+D follows "
1987 "declaration with no linkage", newdecl
);
1988 locate_old_decl (olddecl
);
1991 else if (warn_traditional
)
1993 warned
|= warning (OPT_Wtraditional
,
1994 "non-static declaration of %q+D "
1995 "follows static declaration", newdecl
);
2000 if (TREE_PUBLIC (newdecl
))
2001 error ("non-static declaration of %q+D follows "
2002 "static declaration", newdecl
);
2004 error ("static declaration of %q+D follows "
2005 "non-static declaration", newdecl
);
2007 locate_old_decl (olddecl
);
2011 /* Two objects with the same name declared at the same block
2012 scope must both be external references (6.7p3). */
2013 else if (!DECL_FILE_SCOPE_P (newdecl
))
2015 if (DECL_EXTERNAL (newdecl
))
2017 /* Extern with initializer at block scope, which will
2018 already have received an error. */
2020 else if (DECL_EXTERNAL (olddecl
))
2022 error ("declaration of %q+D with no linkage follows "
2023 "extern declaration", newdecl
);
2024 locate_old_decl (olddecl
);
2028 error ("redeclaration of %q+D with no linkage", newdecl
);
2029 locate_old_decl (olddecl
);
2035 /* C++ does not permit a decl to appear multiple times at file
2038 && DECL_FILE_SCOPE_P (newdecl
)
2039 && !DECL_EXTERNAL (newdecl
)
2040 && !DECL_EXTERNAL (olddecl
))
2041 warned
|= warning_at (DECL_SOURCE_LOCATION (newdecl
),
2043 ("duplicate declaration of %qD is "
2049 /* All decls must agree on a visibility. */
2050 if (CODE_CONTAINS_STRUCT (TREE_CODE (newdecl
), TS_DECL_WITH_VIS
)
2051 && DECL_VISIBILITY_SPECIFIED (newdecl
) && DECL_VISIBILITY_SPECIFIED (olddecl
)
2052 && DECL_VISIBILITY (newdecl
) != DECL_VISIBILITY (olddecl
))
2054 warned
|= warning (0, "redeclaration of %q+D with different visibility "
2055 "(old visibility preserved)", newdecl
);
2058 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2060 /* Diagnose inline __attribute__ ((noinline)) which is silly. */
2061 if (DECL_DECLARED_INLINE_P (newdecl
)
2062 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl
)))
2064 warned
|= warning (OPT_Wattributes
,
2065 "inline declaration of %qD follows "
2066 "declaration with attribute noinline", newdecl
);
2068 else if (DECL_DECLARED_INLINE_P (olddecl
)
2069 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl
)))
2071 warned
|= warning (OPT_Wattributes
,
2072 "declaration of %q+D with attribute "
2073 "noinline follows inline declaration ", newdecl
);
2076 else /* PARM_DECL, VAR_DECL */
2078 /* Redeclaration of a parameter is a constraint violation (this is
2079 not explicitly stated, but follows from C99 6.7p3 [no more than
2080 one declaration of the same identifier with no linkage in the
2081 same scope, except type tags] and 6.2.2p6 [parameters have no
2082 linkage]). We must check for a forward parameter declaration,
2083 indicated by TREE_ASM_WRITTEN on the old declaration - this is
2084 an extension, the mandatory diagnostic for which is handled by
2085 mark_forward_parm_decls. */
2087 if (TREE_CODE (newdecl
) == PARM_DECL
2088 && (!TREE_ASM_WRITTEN (olddecl
) || TREE_ASM_WRITTEN (newdecl
)))
2090 error ("redefinition of parameter %q+D", newdecl
);
2091 locate_old_decl (olddecl
);
2096 /* Optional warning for completely redundant decls. */
2097 if (!warned
&& !pedwarned
2098 && warn_redundant_decls
2099 /* Don't warn about a function declaration followed by a
2101 && !(TREE_CODE (newdecl
) == FUNCTION_DECL
2102 && DECL_INITIAL (newdecl
) && !DECL_INITIAL (olddecl
))
2103 /* Don't warn about redundant redeclarations of builtins. */
2104 && !(TREE_CODE (newdecl
) == FUNCTION_DECL
2105 && !DECL_BUILT_IN (newdecl
)
2106 && DECL_BUILT_IN (olddecl
)
2107 && !C_DECL_DECLARED_BUILTIN (olddecl
))
2108 /* Don't warn about an extern followed by a definition. */
2109 && !(DECL_EXTERNAL (olddecl
) && !DECL_EXTERNAL (newdecl
))
2110 /* Don't warn about forward parameter decls. */
2111 && !(TREE_CODE (newdecl
) == PARM_DECL
2112 && TREE_ASM_WRITTEN (olddecl
) && !TREE_ASM_WRITTEN (newdecl
))
2113 /* Don't warn about a variable definition following a declaration. */
2114 && !(TREE_CODE (newdecl
) == VAR_DECL
2115 && DECL_INITIAL (newdecl
) && !DECL_INITIAL (olddecl
)))
2117 warned
= warning (OPT_Wredundant_decls
, "redundant redeclaration of %q+D",
2121 /* Report location of previous decl/defn. */
2122 if (warned
|| pedwarned
)
2123 locate_old_decl (olddecl
);
2125 #undef DECL_EXTERN_INLINE
2130 /* Subroutine of duplicate_decls. NEWDECL has been found to be
2131 consistent with OLDDECL, but carries new information. Merge the
2132 new information into OLDDECL. This function issues no
2136 merge_decls (tree newdecl
, tree olddecl
, tree newtype
, tree oldtype
)
2138 bool new_is_definition
= (TREE_CODE (newdecl
) == FUNCTION_DECL
2139 && DECL_INITIAL (newdecl
) != 0);
2140 bool new_is_prototype
= (TREE_CODE (newdecl
) == FUNCTION_DECL
2141 && TYPE_ARG_TYPES (TREE_TYPE (newdecl
)) != 0);
2142 bool old_is_prototype
= (TREE_CODE (olddecl
) == FUNCTION_DECL
2143 && TYPE_ARG_TYPES (TREE_TYPE (olddecl
)) != 0);
2144 bool extern_changed
= false;
2146 /* For real parm decl following a forward decl, rechain the old decl
2147 in its new location and clear TREE_ASM_WRITTEN (it's not a
2148 forward decl anymore). */
2149 if (TREE_CODE (newdecl
) == PARM_DECL
2150 && TREE_ASM_WRITTEN (olddecl
) && !TREE_ASM_WRITTEN (newdecl
))
2152 struct c_binding
*b
, **here
;
2154 for (here
= ¤t_scope
->bindings
; *here
; here
= &(*here
)->prev
)
2155 if ((*here
)->decl
== olddecl
)
2162 b
->prev
= current_scope
->bindings
;
2163 current_scope
->bindings
= b
;
2165 TREE_ASM_WRITTEN (olddecl
) = 0;
2168 DECL_ATTRIBUTES (newdecl
)
2169 = targetm
.merge_decl_attributes (olddecl
, newdecl
);
2171 /* Merge the data types specified in the two decls. */
2173 = TREE_TYPE (olddecl
)
2174 = composite_type (newtype
, oldtype
);
2176 /* Lay the type out, unless already done. */
2177 if (!comptypes (oldtype
, TREE_TYPE (newdecl
)))
2179 if (TREE_TYPE (newdecl
) != error_mark_node
)
2180 layout_type (TREE_TYPE (newdecl
));
2181 if (TREE_CODE (newdecl
) != FUNCTION_DECL
2182 && TREE_CODE (newdecl
) != TYPE_DECL
2183 && TREE_CODE (newdecl
) != CONST_DECL
)
2184 layout_decl (newdecl
, 0);
2188 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
2189 DECL_SIZE (newdecl
) = DECL_SIZE (olddecl
);
2190 DECL_SIZE_UNIT (newdecl
) = DECL_SIZE_UNIT (olddecl
);
2191 DECL_MODE (newdecl
) = DECL_MODE (olddecl
);
2192 if (DECL_ALIGN (olddecl
) > DECL_ALIGN (newdecl
))
2194 DECL_ALIGN (newdecl
) = DECL_ALIGN (olddecl
);
2195 DECL_USER_ALIGN (newdecl
) |= DECL_USER_ALIGN (olddecl
);
2199 /* Keep the old rtl since we can safely use it. */
2200 if (HAS_RTL_P (olddecl
))
2201 COPY_DECL_RTL (olddecl
, newdecl
);
2203 /* Merge the type qualifiers. */
2204 if (TREE_READONLY (newdecl
))
2205 TREE_READONLY (olddecl
) = 1;
2207 if (TREE_THIS_VOLATILE (newdecl
))
2208 TREE_THIS_VOLATILE (olddecl
) = 1;
2210 /* Merge deprecatedness. */
2211 if (TREE_DEPRECATED (newdecl
))
2212 TREE_DEPRECATED (olddecl
) = 1;
2214 /* If a decl is in a system header and the other isn't, keep the one on the
2215 system header. Otherwise, keep source location of definition rather than
2216 declaration and of prototype rather than non-prototype unless that
2217 prototype is built-in. */
2218 if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl
), TS_DECL_WITH_VIS
)
2219 && DECL_IN_SYSTEM_HEADER (olddecl
)
2220 && !DECL_IN_SYSTEM_HEADER (newdecl
) )
2221 DECL_SOURCE_LOCATION (newdecl
) = DECL_SOURCE_LOCATION (olddecl
);
2222 else if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl
), TS_DECL_WITH_VIS
)
2223 && DECL_IN_SYSTEM_HEADER (newdecl
)
2224 && !DECL_IN_SYSTEM_HEADER (olddecl
))
2225 DECL_SOURCE_LOCATION (olddecl
) = DECL_SOURCE_LOCATION (newdecl
);
2226 else if ((DECL_INITIAL (newdecl
) == 0 && DECL_INITIAL (olddecl
) != 0)
2227 || (old_is_prototype
&& !new_is_prototype
2228 && !C_DECL_BUILTIN_PROTOTYPE (olddecl
)))
2229 DECL_SOURCE_LOCATION (newdecl
) = DECL_SOURCE_LOCATION (olddecl
);
2231 /* Merge the initialization information. */
2232 if (DECL_INITIAL (newdecl
) == 0)
2233 DECL_INITIAL (newdecl
) = DECL_INITIAL (olddecl
);
2235 /* Merge the threadprivate attribute. */
2236 if (TREE_CODE (olddecl
) == VAR_DECL
&& C_DECL_THREADPRIVATE_P (olddecl
))
2238 DECL_TLS_MODEL (newdecl
) = DECL_TLS_MODEL (olddecl
);
2239 C_DECL_THREADPRIVATE_P (newdecl
) = 1;
2242 if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl
), TS_DECL_WITH_VIS
))
2244 /* Merge the section attribute.
2245 We want to issue an error if the sections conflict but that
2246 must be done later in decl_attributes since we are called
2247 before attributes are assigned. */
2248 if (DECL_SECTION_NAME (newdecl
) == NULL_TREE
)
2249 DECL_SECTION_NAME (newdecl
) = DECL_SECTION_NAME (olddecl
);
2251 /* Copy the assembler name.
2252 Currently, it can only be defined in the prototype. */
2253 COPY_DECL_ASSEMBLER_NAME (olddecl
, newdecl
);
2255 /* Use visibility of whichever declaration had it specified */
2256 if (DECL_VISIBILITY_SPECIFIED (olddecl
))
2258 DECL_VISIBILITY (newdecl
) = DECL_VISIBILITY (olddecl
);
2259 DECL_VISIBILITY_SPECIFIED (newdecl
) = 1;
2262 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2264 DECL_STATIC_CONSTRUCTOR(newdecl
) |= DECL_STATIC_CONSTRUCTOR(olddecl
);
2265 DECL_STATIC_DESTRUCTOR (newdecl
) |= DECL_STATIC_DESTRUCTOR (olddecl
);
2266 DECL_NO_LIMIT_STACK (newdecl
) |= DECL_NO_LIMIT_STACK (olddecl
);
2267 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl
)
2268 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl
);
2269 TREE_THIS_VOLATILE (newdecl
) |= TREE_THIS_VOLATILE (olddecl
);
2270 DECL_IS_MALLOC (newdecl
) |= DECL_IS_MALLOC (olddecl
);
2271 DECL_IS_OPERATOR_NEW (newdecl
) |= DECL_IS_OPERATOR_NEW (olddecl
);
2272 TREE_READONLY (newdecl
) |= TREE_READONLY (olddecl
);
2273 DECL_PURE_P (newdecl
) |= DECL_PURE_P (olddecl
);
2274 DECL_IS_NOVOPS (newdecl
) |= DECL_IS_NOVOPS (olddecl
);
2277 /* Merge the storage class information. */
2278 merge_weak (newdecl
, olddecl
);
2280 /* For functions, static overrides non-static. */
2281 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2283 TREE_PUBLIC (newdecl
) &= TREE_PUBLIC (olddecl
);
2284 /* This is since we don't automatically
2285 copy the attributes of NEWDECL into OLDDECL. */
2286 TREE_PUBLIC (olddecl
) = TREE_PUBLIC (newdecl
);
2287 /* If this clears `static', clear it in the identifier too. */
2288 if (!TREE_PUBLIC (olddecl
))
2289 TREE_PUBLIC (DECL_NAME (olddecl
)) = 0;
2293 /* In c99, 'extern' declaration before (or after) 'inline' means this
2294 function is not DECL_EXTERNAL, unless 'gnu_inline' attribute
2296 if (TREE_CODE (newdecl
) == FUNCTION_DECL
2297 && !flag_gnu89_inline
2298 && (DECL_DECLARED_INLINE_P (newdecl
)
2299 || DECL_DECLARED_INLINE_P (olddecl
))
2300 && (!DECL_DECLARED_INLINE_P (newdecl
)
2301 || !DECL_DECLARED_INLINE_P (olddecl
)
2302 || !DECL_EXTERNAL (olddecl
))
2303 && DECL_EXTERNAL (newdecl
)
2304 && !lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (newdecl
))
2305 && !current_function_decl
)
2306 DECL_EXTERNAL (newdecl
) = 0;
2308 if (DECL_EXTERNAL (newdecl
))
2310 TREE_STATIC (newdecl
) = TREE_STATIC (olddecl
);
2311 DECL_EXTERNAL (newdecl
) = DECL_EXTERNAL (olddecl
);
2313 /* An extern decl does not override previous storage class. */
2314 TREE_PUBLIC (newdecl
) = TREE_PUBLIC (olddecl
);
2315 if (!DECL_EXTERNAL (newdecl
))
2317 DECL_CONTEXT (newdecl
) = DECL_CONTEXT (olddecl
);
2318 DECL_COMMON (newdecl
) = DECL_COMMON (olddecl
);
2323 TREE_STATIC (olddecl
) = TREE_STATIC (newdecl
);
2324 TREE_PUBLIC (olddecl
) = TREE_PUBLIC (newdecl
);
2327 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2329 /* If we're redefining a function previously defined as extern
2330 inline, make sure we emit debug info for the inline before we
2331 throw it away, in case it was inlined into a function that
2332 hasn't been written out yet. */
2333 if (new_is_definition
&& DECL_INITIAL (olddecl
))
2334 /* The new defn must not be inline. */
2335 DECL_UNINLINABLE (newdecl
) = 1;
2338 /* If either decl says `inline', this fn is inline, unless
2339 its definition was passed already. */
2340 if (DECL_DECLARED_INLINE_P (newdecl
)
2341 || DECL_DECLARED_INLINE_P (olddecl
))
2342 DECL_DECLARED_INLINE_P (newdecl
) = 1;
2344 DECL_UNINLINABLE (newdecl
) = DECL_UNINLINABLE (olddecl
)
2345 = (DECL_UNINLINABLE (newdecl
) || DECL_UNINLINABLE (olddecl
));
2347 DECL_DISREGARD_INLINE_LIMITS (newdecl
)
2348 = DECL_DISREGARD_INLINE_LIMITS (olddecl
)
2349 = (DECL_DISREGARD_INLINE_LIMITS (newdecl
)
2350 || DECL_DISREGARD_INLINE_LIMITS (olddecl
));
2353 if (DECL_BUILT_IN (olddecl
))
2355 /* If redeclaring a builtin function, it stays built in.
2356 But it gets tagged as having been declared. */
2357 DECL_BUILT_IN_CLASS (newdecl
) = DECL_BUILT_IN_CLASS (olddecl
);
2358 DECL_FUNCTION_CODE (newdecl
) = DECL_FUNCTION_CODE (olddecl
);
2359 C_DECL_DECLARED_BUILTIN (newdecl
) = 1;
2360 if (new_is_prototype
)
2361 C_DECL_BUILTIN_PROTOTYPE (newdecl
) = 0;
2363 C_DECL_BUILTIN_PROTOTYPE (newdecl
)
2364 = C_DECL_BUILTIN_PROTOTYPE (olddecl
);
2367 /* Preserve function specific target and optimization options */
2368 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl
)
2369 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl
))
2370 DECL_FUNCTION_SPECIFIC_TARGET (newdecl
)
2371 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl
);
2373 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl
)
2374 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl
))
2375 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl
)
2376 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl
);
2378 /* Also preserve various other info from the definition. */
2379 if (!new_is_definition
)
2382 DECL_RESULT (newdecl
) = DECL_RESULT (olddecl
);
2383 DECL_INITIAL (newdecl
) = DECL_INITIAL (olddecl
);
2384 DECL_STRUCT_FUNCTION (newdecl
) = DECL_STRUCT_FUNCTION (olddecl
);
2385 DECL_SAVED_TREE (newdecl
) = DECL_SAVED_TREE (olddecl
);
2386 DECL_ARGUMENTS (newdecl
) = copy_list (DECL_ARGUMENTS (olddecl
));
2387 for (t
= DECL_ARGUMENTS (newdecl
); t
; t
= DECL_CHAIN (t
))
2388 DECL_CONTEXT (t
) = newdecl
;
2390 /* See if we've got a function to instantiate from. */
2391 if (DECL_SAVED_TREE (olddecl
))
2392 DECL_ABSTRACT_ORIGIN (newdecl
)
2393 = DECL_ABSTRACT_ORIGIN (olddecl
);
2397 extern_changed
= DECL_EXTERNAL (olddecl
) && !DECL_EXTERNAL (newdecl
);
2399 /* Merge the USED information. */
2400 if (TREE_USED (olddecl
))
2401 TREE_USED (newdecl
) = 1;
2402 else if (TREE_USED (newdecl
))
2403 TREE_USED (olddecl
) = 1;
2404 if (TREE_CODE (olddecl
) == VAR_DECL
|| TREE_CODE (olddecl
) == PARM_DECL
)
2405 DECL_READ_P (newdecl
) |= DECL_READ_P (olddecl
);
2406 if (DECL_PRESERVE_P (olddecl
))
2407 DECL_PRESERVE_P (newdecl
) = 1;
2408 else if (DECL_PRESERVE_P (newdecl
))
2409 DECL_PRESERVE_P (olddecl
) = 1;
2411 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
2412 But preserve OLDDECL's DECL_UID, DECL_CONTEXT and
2413 DECL_ARGUMENTS (if appropriate). */
2415 unsigned olddecl_uid
= DECL_UID (olddecl
);
2416 tree olddecl_context
= DECL_CONTEXT (olddecl
);
2417 tree olddecl_arguments
= NULL
;
2418 if (TREE_CODE (olddecl
) == FUNCTION_DECL
)
2419 olddecl_arguments
= DECL_ARGUMENTS (olddecl
);
2421 memcpy ((char *) olddecl
+ sizeof (struct tree_common
),
2422 (char *) newdecl
+ sizeof (struct tree_common
),
2423 sizeof (struct tree_decl_common
) - sizeof (struct tree_common
));
2424 switch (TREE_CODE (olddecl
))
2434 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
2435 (char *) newdecl
+ sizeof (struct tree_decl_common
),
2436 tree_code_size (TREE_CODE (olddecl
)) - sizeof (struct tree_decl_common
));
2441 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
2442 (char *) newdecl
+ sizeof (struct tree_decl_common
),
2443 sizeof (struct tree_decl_non_common
) - sizeof (struct tree_decl_common
));
2445 DECL_UID (olddecl
) = olddecl_uid
;
2446 DECL_CONTEXT (olddecl
) = olddecl_context
;
2447 if (TREE_CODE (olddecl
) == FUNCTION_DECL
)
2448 DECL_ARGUMENTS (olddecl
) = olddecl_arguments
;
2451 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2452 so that encode_section_info has a chance to look at the new decl
2453 flags and attributes. */
2454 if (DECL_RTL_SET_P (olddecl
)
2455 && (TREE_CODE (olddecl
) == FUNCTION_DECL
2456 || (TREE_CODE (olddecl
) == VAR_DECL
2457 && TREE_STATIC (olddecl
))))
2458 make_decl_rtl (olddecl
);
2460 /* If we changed a function from DECL_EXTERNAL to !DECL_EXTERNAL,
2461 and the definition is coming from the old version, cgraph needs
2462 to be called again. */
2463 if (extern_changed
&& !new_is_definition
2464 && TREE_CODE (olddecl
) == FUNCTION_DECL
&& DECL_INITIAL (olddecl
))
2465 cgraph_mark_if_needed (olddecl
);
2468 /* Handle when a new declaration NEWDECL has the same name as an old
2469 one OLDDECL in the same binding contour. Prints an error message
2472 If safely possible, alter OLDDECL to look like NEWDECL, and return
2473 true. Otherwise, return false. */
2476 duplicate_decls (tree newdecl
, tree olddecl
)
2478 tree newtype
= NULL
, oldtype
= NULL
;
2480 if (!diagnose_mismatched_decls (newdecl
, olddecl
, &newtype
, &oldtype
))
2482 /* Avoid `unused variable' and other warnings for OLDDECL. */
2483 TREE_NO_WARNING (olddecl
) = 1;
2487 merge_decls (newdecl
, olddecl
, newtype
, oldtype
);
2492 /* Check whether decl-node NEW_DECL shadows an existing declaration. */
2494 warn_if_shadowing (tree new_decl
)
2496 struct c_binding
*b
;
2498 /* Shadow warnings wanted? */
2500 /* No shadow warnings for internally generated vars. */
2501 || DECL_IS_BUILTIN (new_decl
)
2502 /* No shadow warnings for vars made for inlining. */
2503 || DECL_FROM_INLINE (new_decl
))
2506 /* Is anything being shadowed? Invisible decls do not count. */
2507 for (b
= I_SYMBOL_BINDING (DECL_NAME (new_decl
)); b
; b
= b
->shadowed
)
2508 if (b
->decl
&& b
->decl
!= new_decl
&& !b
->invisible
)
2510 tree old_decl
= b
->decl
;
2512 if (old_decl
== error_mark_node
)
2514 warning (OPT_Wshadow
, "declaration of %q+D shadows previous "
2515 "non-variable", new_decl
);
2518 else if (TREE_CODE (old_decl
) == PARM_DECL
)
2519 warning (OPT_Wshadow
, "declaration of %q+D shadows a parameter",
2521 else if (DECL_FILE_SCOPE_P (old_decl
))
2522 warning (OPT_Wshadow
, "declaration of %q+D shadows a global "
2523 "declaration", new_decl
);
2524 else if (TREE_CODE (old_decl
) == FUNCTION_DECL
2525 && DECL_BUILT_IN (old_decl
))
2527 warning (OPT_Wshadow
, "declaration of %q+D shadows "
2528 "a built-in function", new_decl
);
2532 warning (OPT_Wshadow
, "declaration of %q+D shadows a previous local",
2535 warning_at (DECL_SOURCE_LOCATION (old_decl
), OPT_Wshadow
,
2536 "shadowed declaration is here");
2542 /* Record a decl-node X as belonging to the current lexical scope.
2543 Check for errors (such as an incompatible declaration for the same
2544 name already seen in the same scope).
2546 Returns either X or an old decl for the same name.
2547 If an old decl is returned, it may have been smashed
2548 to agree with what X says. */
2553 tree name
= DECL_NAME (x
);
2554 struct c_scope
*scope
= current_scope
;
2555 struct c_binding
*b
;
2556 bool nested
= false;
2557 location_t locus
= DECL_SOURCE_LOCATION (x
);
2559 /* Must set DECL_CONTEXT for everything not at file scope or
2560 DECL_FILE_SCOPE_P won't work. Local externs don't count
2561 unless they have initializers (which generate code). */
2562 if (current_function_decl
2563 && ((TREE_CODE (x
) != FUNCTION_DECL
&& TREE_CODE (x
) != VAR_DECL
)
2564 || DECL_INITIAL (x
) || !DECL_EXTERNAL (x
)))
2565 DECL_CONTEXT (x
) = current_function_decl
;
2567 /* Anonymous decls are just inserted in the scope. */
2570 bind (name
, x
, scope
, /*invisible=*/false, /*nested=*/false,
2575 /* First, see if there is another declaration with the same name in
2576 the current scope. If there is, duplicate_decls may do all the
2577 work for us. If duplicate_decls returns false, that indicates
2578 two incompatible decls in the same scope; we are to silently
2579 replace the old one (duplicate_decls has issued all appropriate
2580 diagnostics). In particular, we should not consider possible
2581 duplicates in the external scope, or shadowing. */
2582 b
= I_SYMBOL_BINDING (name
);
2583 if (b
&& B_IN_SCOPE (b
, scope
))
2585 struct c_binding
*b_ext
, *b_use
;
2586 tree type
= TREE_TYPE (x
);
2587 tree visdecl
= b
->decl
;
2588 tree vistype
= TREE_TYPE (visdecl
);
2589 if (TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
2590 && COMPLETE_TYPE_P (TREE_TYPE (x
)))
2591 b
->inner_comp
= false;
2594 /* If this is an external linkage declaration, we should check
2595 for compatibility with the type in the external scope before
2596 setting the type at this scope based on the visible
2597 information only. */
2598 if (TREE_PUBLIC (x
) && TREE_PUBLIC (visdecl
))
2600 while (b_ext
&& !B_IN_EXTERNAL_SCOPE (b_ext
))
2601 b_ext
= b_ext
->shadowed
;
2606 TREE_TYPE (b_use
->decl
) = b_use
->u
.type
;
2609 if (duplicate_decls (x
, b_use
->decl
))
2613 /* Save the updated type in the external scope and
2614 restore the proper type for this scope. */
2616 if (comptypes (vistype
, type
))
2617 thistype
= composite_type (vistype
, type
);
2619 thistype
= TREE_TYPE (b_use
->decl
);
2620 b_use
->u
.type
= TREE_TYPE (b_use
->decl
);
2621 if (TREE_CODE (b_use
->decl
) == FUNCTION_DECL
2622 && DECL_BUILT_IN (b_use
->decl
))
2624 = build_type_attribute_variant (thistype
,
2627 TREE_TYPE (b_use
->decl
) = thistype
;
2632 goto skip_external_and_shadow_checks
;
2635 /* All declarations with external linkage, and all external
2636 references, go in the external scope, no matter what scope is
2637 current. However, the binding in that scope is ignored for
2638 purposes of normal name lookup. A separate binding structure is
2639 created in the requested scope; this governs the normal
2640 visibility of the symbol.
2642 The binding in the externals scope is used exclusively for
2643 detecting duplicate declarations of the same object, no matter
2644 what scope they are in; this is what we do here. (C99 6.2.7p2:
2645 All declarations that refer to the same object or function shall
2646 have compatible type; otherwise, the behavior is undefined.) */
2647 if (DECL_EXTERNAL (x
) || scope
== file_scope
)
2649 tree type
= TREE_TYPE (x
);
2652 bool type_saved
= false;
2653 if (b
&& !B_IN_EXTERNAL_SCOPE (b
)
2654 && (TREE_CODE (b
->decl
) == FUNCTION_DECL
2655 || TREE_CODE (b
->decl
) == VAR_DECL
)
2656 && DECL_FILE_SCOPE_P (b
->decl
))
2659 vistype
= TREE_TYPE (visdecl
);
2661 if (scope
!= file_scope
2662 && !DECL_IN_SYSTEM_HEADER (x
))
2663 warning (OPT_Wnested_externs
, "nested extern declaration of %qD", x
);
2665 while (b
&& !B_IN_EXTERNAL_SCOPE (b
))
2667 /* If this decl might be modified, save its type. This is
2668 done here rather than when the decl is first bound
2669 because the type may change after first binding, through
2670 being completed or through attributes being added. If we
2671 encounter multiple such decls, only the first should have
2672 its type saved; the others will already have had their
2673 proper types saved and the types will not have changed as
2674 their scopes will not have been re-entered. */
2675 if (DECL_P (b
->decl
) && DECL_FILE_SCOPE_P (b
->decl
) && !type_saved
)
2677 b
->u
.type
= TREE_TYPE (b
->decl
);
2680 if (B_IN_FILE_SCOPE (b
)
2681 && TREE_CODE (b
->decl
) == VAR_DECL
2682 && TREE_STATIC (b
->decl
)
2683 && TREE_CODE (TREE_TYPE (b
->decl
)) == ARRAY_TYPE
2684 && !TYPE_DOMAIN (TREE_TYPE (b
->decl
))
2685 && TREE_CODE (type
) == ARRAY_TYPE
2686 && TYPE_DOMAIN (type
)
2687 && TYPE_MAX_VALUE (TYPE_DOMAIN (type
))
2688 && !integer_zerop (TYPE_MAX_VALUE (TYPE_DOMAIN (type
))))
2690 /* Array type completed in inner scope, which should be
2691 diagnosed if the completion does not have size 1 and
2692 it does not get completed in the file scope. */
2693 b
->inner_comp
= true;
2698 /* If a matching external declaration has been found, set its
2699 type to the composite of all the types of that declaration.
2700 After the consistency checks, it will be reset to the
2701 composite of the visible types only. */
2702 if (b
&& (TREE_PUBLIC (x
) || same_translation_unit_p (x
, b
->decl
))
2704 TREE_TYPE (b
->decl
) = b
->u
.type
;
2706 /* The point of the same_translation_unit_p check here is,
2707 we want to detect a duplicate decl for a construct like
2708 foo() { extern bar(); } ... static bar(); but not if
2709 they are in different translation units. In any case,
2710 the static does not go in the externals scope. */
2712 && (TREE_PUBLIC (x
) || same_translation_unit_p (x
, b
->decl
))
2713 && duplicate_decls (x
, b
->decl
))
2718 if (comptypes (vistype
, type
))
2719 thistype
= composite_type (vistype
, type
);
2721 thistype
= TREE_TYPE (b
->decl
);
2725 b
->u
.type
= TREE_TYPE (b
->decl
);
2726 if (TREE_CODE (b
->decl
) == FUNCTION_DECL
&& DECL_BUILT_IN (b
->decl
))
2728 = build_type_attribute_variant (thistype
,
2729 TYPE_ATTRIBUTES (b
->u
.type
));
2730 TREE_TYPE (b
->decl
) = thistype
;
2731 bind (name
, b
->decl
, scope
, /*invisible=*/false, /*nested=*/true,
2735 else if (TREE_PUBLIC (x
))
2737 if (visdecl
&& !b
&& duplicate_decls (x
, visdecl
))
2739 /* An external declaration at block scope referring to a
2740 visible entity with internal linkage. The composite
2741 type will already be correct for this scope, so we
2742 just need to fall through to make the declaration in
2749 bind (name
, x
, external_scope
, /*invisible=*/true,
2750 /*nested=*/false, locus
);
2756 if (TREE_CODE (x
) != PARM_DECL
)
2757 warn_if_shadowing (x
);
2759 skip_external_and_shadow_checks
:
2760 if (TREE_CODE (x
) == TYPE_DECL
)
2761 set_underlying_type (x
);
2763 bind (name
, x
, scope
, /*invisible=*/false, nested
, locus
);
2765 /* If x's type is incomplete because it's based on a
2766 structure or union which has not yet been fully declared,
2767 attach it to that structure or union type, so we can go
2768 back and complete the variable declaration later, if the
2769 structure or union gets fully declared.
2771 If the input is erroneous, we can have error_mark in the type
2772 slot (e.g. "f(void a, ...)") - that doesn't count as an
2774 if (TREE_TYPE (x
) != error_mark_node
2775 && !COMPLETE_TYPE_P (TREE_TYPE (x
)))
2777 tree element
= TREE_TYPE (x
);
2779 while (TREE_CODE (element
) == ARRAY_TYPE
)
2780 element
= TREE_TYPE (element
);
2781 element
= TYPE_MAIN_VARIANT (element
);
2783 if ((TREE_CODE (element
) == RECORD_TYPE
2784 || TREE_CODE (element
) == UNION_TYPE
)
2785 && (TREE_CODE (x
) != TYPE_DECL
2786 || TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
)
2787 && !COMPLETE_TYPE_P (element
))
2788 C_TYPE_INCOMPLETE_VARS (element
)
2789 = tree_cons (NULL_TREE
, x
, C_TYPE_INCOMPLETE_VARS (element
));
2794 /* Record X as belonging to file scope.
2795 This is used only internally by the Objective-C front end,
2796 and is limited to its needs. duplicate_decls is not called;
2797 if there is any preexisting decl for this identifier, it is an ICE. */
2800 pushdecl_top_level (tree x
)
2803 bool nested
= false;
2804 gcc_assert (TREE_CODE (x
) == VAR_DECL
|| TREE_CODE (x
) == CONST_DECL
);
2806 name
= DECL_NAME (x
);
2808 gcc_assert (TREE_CODE (x
) == CONST_DECL
|| !I_SYMBOL_BINDING (name
));
2810 if (TREE_PUBLIC (x
))
2812 bind (name
, x
, external_scope
, /*invisible=*/true, /*nested=*/false,
2817 bind (name
, x
, file_scope
, /*invisible=*/false, nested
, UNKNOWN_LOCATION
);
2823 implicit_decl_warning (tree id
, tree olddecl
)
2825 if (warn_implicit_function_declaration
)
2830 warned
= pedwarn (input_location
, OPT_Wimplicit_function_declaration
,
2831 "implicit declaration of function %qE", id
);
2833 warned
= warning (OPT_Wimplicit_function_declaration
,
2834 G_("implicit declaration of function %qE"), id
);
2835 if (olddecl
&& warned
)
2836 locate_old_decl (olddecl
);
2840 /* Generate an implicit declaration for identifier FUNCTIONID at LOC as a
2841 function of type int (). */
2844 implicitly_declare (location_t loc
, tree functionid
)
2846 struct c_binding
*b
;
2850 for (b
= I_SYMBOL_BINDING (functionid
); b
; b
= b
->shadowed
)
2852 if (B_IN_SCOPE (b
, external_scope
))
2861 if (decl
== error_mark_node
)
2864 /* FIXME: Objective-C has weird not-really-builtin functions
2865 which are supposed to be visible automatically. They wind up
2866 in the external scope because they're pushed before the file
2867 scope gets created. Catch this here and rebind them into the
2869 if (!DECL_BUILT_IN (decl
) && DECL_IS_BUILTIN (decl
))
2871 bind (functionid
, decl
, file_scope
,
2872 /*invisible=*/false, /*nested=*/true,
2873 DECL_SOURCE_LOCATION (decl
));
2878 tree newtype
= default_function_type
;
2880 TREE_TYPE (decl
) = b
->u
.type
;
2881 /* Implicit declaration of a function already declared
2882 (somehow) in a different scope, or as a built-in.
2883 If this is the first time this has happened, warn;
2884 then recycle the old declaration but with the new type. */
2885 if (!C_DECL_IMPLICIT (decl
))
2887 implicit_decl_warning (functionid
, decl
);
2888 C_DECL_IMPLICIT (decl
) = 1;
2890 if (DECL_BUILT_IN (decl
))
2892 newtype
= build_type_attribute_variant (newtype
,
2894 (TREE_TYPE (decl
)));
2895 if (!comptypes (newtype
, TREE_TYPE (decl
)))
2897 warning_at (loc
, 0, "incompatible implicit declaration of "
2898 "built-in function %qD", decl
);
2899 newtype
= TREE_TYPE (decl
);
2904 if (!comptypes (newtype
, TREE_TYPE (decl
)))
2906 error_at (loc
, "incompatible implicit declaration of function %qD", decl
);
2907 locate_old_decl (decl
);
2910 b
->u
.type
= TREE_TYPE (decl
);
2911 TREE_TYPE (decl
) = newtype
;
2912 bind (functionid
, decl
, current_scope
,
2913 /*invisible=*/false, /*nested=*/true,
2914 DECL_SOURCE_LOCATION (decl
));
2919 /* Not seen before. */
2920 decl
= build_decl (loc
, FUNCTION_DECL
, functionid
, default_function_type
);
2921 DECL_EXTERNAL (decl
) = 1;
2922 TREE_PUBLIC (decl
) = 1;
2923 C_DECL_IMPLICIT (decl
) = 1;
2924 implicit_decl_warning (functionid
, 0);
2925 asmspec_tree
= maybe_apply_renaming_pragma (decl
, /*asmname=*/NULL
);
2927 set_user_assembler_name (decl
, TREE_STRING_POINTER (asmspec_tree
));
2929 /* C89 says implicit declarations are in the innermost block.
2930 So we record the decl in the standard fashion. */
2931 decl
= pushdecl (decl
);
2933 /* No need to call objc_check_decl here - it's a function type. */
2934 rest_of_decl_compilation (decl
, 0, 0);
2936 /* Write a record describing this implicit function declaration
2937 to the prototypes file (if requested). */
2938 gen_aux_info_record (decl
, 0, 1, 0);
2940 /* Possibly apply some default attributes to this implicit declaration. */
2941 decl_attributes (&decl
, NULL_TREE
, 0);
2946 /* Issue an error message for a reference to an undeclared variable
2947 ID, including a reference to a builtin outside of function-call
2948 context. Establish a binding of the identifier to error_mark_node
2949 in an appropriate scope, which will suppress further errors for the
2950 same identifier. The error message should be given location LOC. */
2952 undeclared_variable (location_t loc
, tree id
)
2954 static bool already
= false;
2955 struct c_scope
*scope
;
2957 if (current_function_decl
== 0)
2959 error_at (loc
, "%qE undeclared here (not in a function)", id
);
2960 scope
= current_scope
;
2964 error_at (loc
, "%qE undeclared (first use in this function)", id
);
2967 inform (loc
, "each undeclared identifier is reported only"
2968 " once for each function it appears in");
2972 /* If we are parsing old-style parameter decls, current_function_decl
2973 will be nonnull but current_function_scope will be null. */
2974 scope
= current_function_scope
? current_function_scope
: current_scope
;
2976 bind (id
, error_mark_node
, scope
, /*invisible=*/false, /*nested=*/false,
2980 /* Subroutine of lookup_label, declare_label, define_label: construct a
2981 LABEL_DECL with all the proper frills. Also create a struct
2982 c_label_vars initialized for the current scope. */
2985 make_label (location_t location
, tree name
, bool defining
,
2986 struct c_label_vars
**p_label_vars
)
2988 tree label
= build_decl (location
, LABEL_DECL
, name
, void_type_node
);
2989 struct c_label_vars
*label_vars
;
2991 DECL_CONTEXT (label
) = current_function_decl
;
2992 DECL_MODE (label
) = VOIDmode
;
2994 label_vars
= ggc_alloc_c_label_vars ();
2995 label_vars
->shadowed
= NULL
;
2996 set_spot_bindings (&label_vars
->label_bindings
, defining
);
2997 label_vars
->decls_in_scope
= make_tree_vector ();
2998 label_vars
->gotos
= VEC_alloc (c_goto_bindings_p
, gc
, 0);
2999 *p_label_vars
= label_vars
;
3004 /* Get the LABEL_DECL corresponding to identifier NAME as a label.
3005 Create one if none exists so far for the current function.
3006 This is called when a label is used in a goto expression or
3007 has its address taken. */
3010 lookup_label (tree name
)
3013 struct c_label_vars
*label_vars
;
3015 if (current_function_decl
== 0)
3017 error ("label %qE referenced outside of any function", name
);
3021 /* Use a label already defined or ref'd with this name, but not if
3022 it is inherited from a containing function and wasn't declared
3024 label
= I_LABEL_DECL (name
);
3025 if (label
&& (DECL_CONTEXT (label
) == current_function_decl
3026 || C_DECLARED_LABEL_FLAG (label
)))
3028 /* If the label has only been declared, update its apparent
3029 location to point here, for better diagnostics if it
3030 turns out not to have been defined. */
3031 if (DECL_INITIAL (label
) == NULL_TREE
)
3032 DECL_SOURCE_LOCATION (label
) = input_location
;
3036 /* No label binding for that identifier; make one. */
3037 label
= make_label (input_location
, name
, false, &label_vars
);
3039 /* Ordinary labels go in the current function scope. */
3040 bind_label (name
, label
, current_function_scope
, label_vars
);
3045 /* Issue a warning about DECL for a goto statement at GOTO_LOC going
3049 warn_about_goto (location_t goto_loc
, tree label
, tree decl
)
3051 if (variably_modified_type_p (TREE_TYPE (decl
), NULL_TREE
))
3053 "jump into scope of identifier with variably modified type");
3055 warning_at (goto_loc
, OPT_Wjump_misses_init
,
3056 "jump skips variable initialization");
3057 inform (DECL_SOURCE_LOCATION (label
), "label %qD defined here", label
);
3058 inform (DECL_SOURCE_LOCATION (decl
), "%qD declared here", decl
);
3061 /* Look up a label because of a goto statement. This is like
3062 lookup_label, but also issues any appropriate warnings. */
3065 lookup_label_for_goto (location_t loc
, tree name
)
3068 struct c_label_vars
*label_vars
;
3072 label
= lookup_label (name
);
3073 if (label
== NULL_TREE
)
3076 /* If we are jumping to a different function, we can't issue any
3078 if (DECL_CONTEXT (label
) != current_function_decl
)
3080 gcc_assert (C_DECLARED_LABEL_FLAG (label
));
3084 label_vars
= I_LABEL_BINDING (name
)->u
.label
;
3086 /* If the label has not yet been defined, then push this goto on a
3087 list for possible later warnings. */
3088 if (label_vars
->label_bindings
.scope
== NULL
)
3090 struct c_goto_bindings
*g
;
3092 g
= ggc_alloc_c_goto_bindings ();
3094 set_spot_bindings (&g
->goto_bindings
, true);
3095 VEC_safe_push (c_goto_bindings_p
, gc
, label_vars
->gotos
, g
);
3099 /* If there are any decls in label_vars->decls_in_scope, then this
3100 goto has missed the declaration of the decl. This happens for a
3106 Issue a warning or error. */
3107 FOR_EACH_VEC_ELT (tree
, label_vars
->decls_in_scope
, ix
, decl
)
3108 warn_about_goto (loc
, label
, decl
);
3110 if (label_vars
->label_bindings
.left_stmt_expr
)
3112 error_at (loc
, "jump into statement expression");
3113 inform (DECL_SOURCE_LOCATION (label
), "label %qD defined here", label
);
3119 /* Make a label named NAME in the current function, shadowing silently
3120 any that may be inherited from containing functions or containing
3121 scopes. This is called for __label__ declarations. */
3124 declare_label (tree name
)
3126 struct c_binding
*b
= I_LABEL_BINDING (name
);
3128 struct c_label_vars
*label_vars
;
3130 /* Check to make sure that the label hasn't already been declared
3132 if (b
&& B_IN_CURRENT_SCOPE (b
))
3134 error ("duplicate label declaration %qE", name
);
3135 locate_old_decl (b
->decl
);
3137 /* Just use the previous declaration. */
3141 label
= make_label (input_location
, name
, false, &label_vars
);
3142 C_DECLARED_LABEL_FLAG (label
) = 1;
3144 /* Declared labels go in the current scope. */
3145 bind_label (name
, label
, current_scope
, label_vars
);
3150 /* When we define a label, issue any appropriate warnings if there are
3151 any gotos earlier in the function which jump to this label. */
3154 check_earlier_gotos (tree label
, struct c_label_vars
* label_vars
)
3157 struct c_goto_bindings
*g
;
3159 FOR_EACH_VEC_ELT (c_goto_bindings_p
, label_vars
->gotos
, ix
, g
)
3161 struct c_binding
*b
;
3162 struct c_scope
*scope
;
3164 /* We have a goto to this label. The goto is going forward. In
3165 g->scope, the goto is going to skip any binding which was
3166 defined after g->bindings_in_scope. */
3167 for (b
= g
->goto_bindings
.scope
->bindings
;
3168 b
!= g
->goto_bindings
.bindings_in_scope
;
3171 if (decl_jump_unsafe (b
->decl
))
3172 warn_about_goto (g
->loc
, label
, b
->decl
);
3175 /* We also need to warn about decls defined in any scopes
3176 between the scope of the label and the scope of the goto. */
3177 for (scope
= label_vars
->label_bindings
.scope
;
3178 scope
!= g
->goto_bindings
.scope
;
3179 scope
= scope
->outer
)
3181 gcc_assert (scope
!= NULL
);
3182 if (scope
== label_vars
->label_bindings
.scope
)
3183 b
= label_vars
->label_bindings
.bindings_in_scope
;
3185 b
= scope
->bindings
;
3186 for (; b
!= NULL
; b
= b
->prev
)
3188 if (decl_jump_unsafe (b
->decl
))
3189 warn_about_goto (g
->loc
, label
, b
->decl
);
3193 if (g
->goto_bindings
.stmt_exprs
> 0)
3195 error_at (g
->loc
, "jump into statement expression");
3196 inform (DECL_SOURCE_LOCATION (label
), "label %qD defined here",
3201 /* Now that the label is defined, we will issue warnings about
3202 subsequent gotos to this label when we see them. */
3203 VEC_truncate (c_goto_bindings_p
, label_vars
->gotos
, 0);
3204 label_vars
->gotos
= NULL
;
3207 /* Define a label, specifying the location in the source file.
3208 Return the LABEL_DECL node for the label, if the definition is valid.
3209 Otherwise return 0. */
3212 define_label (location_t location
, tree name
)
3214 /* Find any preexisting label with this name. It is an error
3215 if that label has already been defined in this function, or
3216 if there is a containing function with a declared label with
3218 tree label
= I_LABEL_DECL (name
);
3221 && ((DECL_CONTEXT (label
) == current_function_decl
3222 && DECL_INITIAL (label
) != 0)
3223 || (DECL_CONTEXT (label
) != current_function_decl
3224 && C_DECLARED_LABEL_FLAG (label
))))
3226 error_at (location
, "duplicate label %qD", label
);
3227 locate_old_decl (label
);
3230 else if (label
&& DECL_CONTEXT (label
) == current_function_decl
)
3232 struct c_label_vars
*label_vars
= I_LABEL_BINDING (name
)->u
.label
;
3234 /* The label has been used or declared already in this function,
3235 but not defined. Update its location to point to this
3237 DECL_SOURCE_LOCATION (label
) = location
;
3238 set_spot_bindings (&label_vars
->label_bindings
, true);
3240 /* Issue warnings as required about any goto statements from
3241 earlier in the function. */
3242 check_earlier_gotos (label
, label_vars
);
3246 struct c_label_vars
*label_vars
;
3248 /* No label binding for that identifier; make one. */
3249 label
= make_label (location
, name
, true, &label_vars
);
3251 /* Ordinary labels go in the current function scope. */
3252 bind_label (name
, label
, current_function_scope
, label_vars
);
3255 if (!in_system_header
&& lookup_name (name
))
3256 warning_at (location
, OPT_Wtraditional
,
3257 "traditional C lacks a separate namespace "
3258 "for labels, identifier %qE conflicts", name
);
3260 /* Mark label as having been defined. */
3261 DECL_INITIAL (label
) = error_mark_node
;
3265 /* Get the bindings for a new switch statement. This is used to issue
3266 warnings as appropriate for jumps from the switch to case or
3269 struct c_spot_bindings
*
3270 c_get_switch_bindings (void)
3272 struct c_spot_bindings
*switch_bindings
;
3274 switch_bindings
= XNEW (struct c_spot_bindings
);
3275 set_spot_bindings (switch_bindings
, true);
3276 return switch_bindings
;
3280 c_release_switch_bindings (struct c_spot_bindings
*bindings
)
3282 gcc_assert (bindings
->stmt_exprs
== 0 && !bindings
->left_stmt_expr
);
3286 /* This is called at the point of a case or default label to issue
3287 warnings about decls as needed. It returns true if it found an
3288 error, not just a warning. */
3291 c_check_switch_jump_warnings (struct c_spot_bindings
*switch_bindings
,
3292 location_t switch_loc
, location_t case_loc
)
3295 struct c_scope
*scope
;
3298 for (scope
= current_scope
;
3299 scope
!= switch_bindings
->scope
;
3300 scope
= scope
->outer
)
3302 struct c_binding
*b
;
3304 gcc_assert (scope
!= NULL
);
3305 for (b
= scope
->bindings
; b
!= NULL
; b
= b
->prev
)
3307 if (decl_jump_unsafe (b
->decl
))
3309 if (variably_modified_type_p (TREE_TYPE (b
->decl
), NULL_TREE
))
3313 ("switch jumps into scope of identifier with "
3314 "variably modified type"));
3317 warning_at (case_loc
, OPT_Wjump_misses_init
,
3318 "switch jumps over variable initialization");
3319 inform (switch_loc
, "switch starts here");
3320 inform (DECL_SOURCE_LOCATION (b
->decl
), "%qD declared here",
3326 if (switch_bindings
->stmt_exprs
> 0)
3329 error_at (case_loc
, "switch jumps into statement expression");
3330 inform (switch_loc
, "switch starts here");
3336 /* Given NAME, an IDENTIFIER_NODE,
3337 return the structure (or union or enum) definition for that name.
3338 If THISLEVEL_ONLY is nonzero, searches only the current_scope.
3339 CODE says which kind of type the caller wants;
3340 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
3341 If PLOC is not NULL and this returns non-null, it sets *PLOC to the
3342 location where the tag was defined.
3343 If the wrong kind of type is found, an error is reported. */
3346 lookup_tag (enum tree_code code
, tree name
, int thislevel_only
,
3349 struct c_binding
*b
= I_TAG_BINDING (name
);
3355 /* We only care about whether it's in this level if
3356 thislevel_only was set or it might be a type clash. */
3357 if (thislevel_only
|| TREE_CODE (b
->decl
) != code
)
3359 /* For our purposes, a tag in the external scope is the same as
3360 a tag in the file scope. (Primarily relevant to Objective-C
3361 and its builtin structure tags, which get pushed before the
3362 file scope is created.) */
3363 if (B_IN_CURRENT_SCOPE (b
)
3364 || (current_scope
== file_scope
&& B_IN_EXTERNAL_SCOPE (b
)))
3368 if (thislevel_only
&& !thislevel
)
3371 if (TREE_CODE (b
->decl
) != code
)
3373 /* Definition isn't the kind we were looking for. */
3374 pending_invalid_xref
= name
;
3375 pending_invalid_xref_location
= input_location
;
3377 /* If in the same binding level as a declaration as a tag
3378 of a different type, this must not be allowed to
3379 shadow that tag, so give the error immediately.
3380 (For example, "struct foo; union foo;" is invalid.) */
3382 pending_xref_error ();
3391 /* Print an error message now
3392 for a recent invalid struct, union or enum cross reference.
3393 We don't print them immediately because they are not invalid
3394 when used in the `struct foo;' construct for shadowing. */
3397 pending_xref_error (void)
3399 if (pending_invalid_xref
!= 0)
3400 error_at (pending_invalid_xref_location
, "%qE defined as wrong kind of tag",
3401 pending_invalid_xref
);
3402 pending_invalid_xref
= 0;
3406 /* Look up NAME in the current scope and its superiors
3407 in the namespace of variables, functions and typedefs.
3408 Return a ..._DECL node of some kind representing its definition,
3409 or return 0 if it is undefined. */
3412 lookup_name (tree name
)
3414 struct c_binding
*b
= I_SYMBOL_BINDING (name
);
3415 if (b
&& !b
->invisible
)
3420 /* Similar to `lookup_name' but look only at the indicated scope. */
3423 lookup_name_in_scope (tree name
, struct c_scope
*scope
)
3425 struct c_binding
*b
;
3427 for (b
= I_SYMBOL_BINDING (name
); b
; b
= b
->shadowed
)
3428 if (B_IN_SCOPE (b
, scope
))
3433 /* Create the predefined scalar types of C,
3434 and some nodes representing standard constants (0, 1, (void *) 0).
3435 Initialize the global scope.
3436 Make definitions for built-in primitive functions. */
3439 c_init_decl_processing (void)
3441 location_t save_loc
= input_location
;
3443 /* Initialize reserved words for parser. */
3446 current_function_decl
= 0;
3448 gcc_obstack_init (&parser_obstack
);
3450 /* Make the externals scope. */
3452 external_scope
= current_scope
;
3454 /* Declarations from c_common_nodes_and_builtins must not be associated
3455 with this input file, lest we get differences between using and not
3456 using preprocessed headers. */
3457 input_location
= BUILTINS_LOCATION
;
3459 build_common_tree_nodes (flag_signed_char
);
3461 c_common_nodes_and_builtins ();
3463 /* In C, comparisons and TRUTH_* expressions have type int. */
3464 truthvalue_type_node
= integer_type_node
;
3465 truthvalue_true_node
= integer_one_node
;
3466 truthvalue_false_node
= integer_zero_node
;
3468 /* Even in C99, which has a real boolean type. */
3469 pushdecl (build_decl (UNKNOWN_LOCATION
, TYPE_DECL
, get_identifier ("_Bool"),
3470 boolean_type_node
));
3472 input_location
= save_loc
;
3474 pedantic_lvalues
= true;
3476 make_fname_decl
= c_make_fname_decl
;
3477 start_fname_decls ();
3480 /* Create the VAR_DECL at LOC for __FUNCTION__ etc. ID is the name to
3481 give the decl, NAME is the initialization string and TYPE_DEP
3482 indicates whether NAME depended on the type of the function. As we
3483 don't yet implement delayed emission of static data, we mark the
3484 decl as emitted so it is not placed in the output. Anything using
3485 it must therefore pull out the STRING_CST initializer directly.
3489 c_make_fname_decl (location_t loc
, tree id
, int type_dep
)
3491 const char *name
= fname_as_string (type_dep
);
3492 tree decl
, type
, init
;
3493 size_t length
= strlen (name
);
3495 type
= build_array_type (char_type_node
,
3496 build_index_type (size_int (length
)));
3497 type
= c_build_qualified_type (type
, TYPE_QUAL_CONST
);
3499 decl
= build_decl (loc
, VAR_DECL
, id
, type
);
3501 TREE_STATIC (decl
) = 1;
3502 TREE_READONLY (decl
) = 1;
3503 DECL_ARTIFICIAL (decl
) = 1;
3505 init
= build_string (length
+ 1, name
);
3506 free (CONST_CAST (char *, name
));
3507 TREE_TYPE (init
) = type
;
3508 DECL_INITIAL (decl
) = init
;
3510 TREE_USED (decl
) = 1;
3512 if (current_function_decl
3513 /* For invalid programs like this:
3516 const char* p = __FUNCTION__;
3518 the __FUNCTION__ is believed to appear in K&R style function
3519 parameter declarator. In that case we still don't have
3521 && (!seen_error () || current_function_scope
))
3523 DECL_CONTEXT (decl
) = current_function_decl
;
3524 bind (id
, decl
, current_function_scope
,
3525 /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION
);
3528 finish_decl (decl
, loc
, init
, NULL_TREE
, NULL_TREE
);
3534 c_builtin_function (tree decl
)
3536 tree type
= TREE_TYPE (decl
);
3537 tree id
= DECL_NAME (decl
);
3539 const char *name
= IDENTIFIER_POINTER (id
);
3540 C_DECL_BUILTIN_PROTOTYPE (decl
) = (TYPE_ARG_TYPES (type
) != 0);
3542 /* Should never be called on a symbol with a preexisting meaning. */
3543 gcc_assert (!I_SYMBOL_BINDING (id
));
3545 bind (id
, decl
, external_scope
, /*invisible=*/true, /*nested=*/false,
3548 /* Builtins in the implementation namespace are made visible without
3549 needing to be explicitly declared. See push_file_scope. */
3550 if (name
[0] == '_' && (name
[1] == '_' || ISUPPER (name
[1])))
3552 DECL_CHAIN (decl
) = visible_builtins
;
3553 visible_builtins
= decl
;
3560 c_builtin_function_ext_scope (tree decl
)
3562 tree type
= TREE_TYPE (decl
);
3563 tree id
= DECL_NAME (decl
);
3565 const char *name
= IDENTIFIER_POINTER (id
);
3566 C_DECL_BUILTIN_PROTOTYPE (decl
) = (TYPE_ARG_TYPES (type
) != 0);
3568 /* Should never be called on a symbol with a preexisting meaning. */
3569 gcc_assert (!I_SYMBOL_BINDING (id
));
3571 bind (id
, decl
, external_scope
, /*invisible=*/false, /*nested=*/false,
3574 /* Builtins in the implementation namespace are made visible without
3575 needing to be explicitly declared. See push_file_scope. */
3576 if (name
[0] == '_' && (name
[1] == '_' || ISUPPER (name
[1])))
3578 DECL_CHAIN (decl
) = visible_builtins
;
3579 visible_builtins
= decl
;
3585 /* Called when a declaration is seen that contains no names to declare.
3586 If its type is a reference to a structure, union or enum inherited
3587 from a containing scope, shadow that tag name for the current scope
3588 with a forward reference.
3589 If its type defines a new named structure or union
3590 or defines an enum, it is valid but we need not do anything here.
3591 Otherwise, it is an error. */
3594 shadow_tag (const struct c_declspecs
*declspecs
)
3596 shadow_tag_warned (declspecs
, 0);
3599 /* WARNED is 1 if we have done a pedwarn, 2 if we have done a warning,
3602 shadow_tag_warned (const struct c_declspecs
*declspecs
, int warned
)
3604 bool found_tag
= false;
3606 if (declspecs
->type
&& !declspecs
->default_int_p
&& !declspecs
->typedef_p
)
3608 tree value
= declspecs
->type
;
3609 enum tree_code code
= TREE_CODE (value
);
3611 if (code
== RECORD_TYPE
|| code
== UNION_TYPE
|| code
== ENUMERAL_TYPE
)
3612 /* Used to test also that TYPE_SIZE (value) != 0.
3613 That caused warning for `struct foo;' at top level in the file. */
3615 tree name
= TYPE_NAME (value
);
3620 if (declspecs
->restrict_p
)
3622 error ("invalid use of %<restrict%>");
3628 if (warned
!= 1 && code
!= ENUMERAL_TYPE
)
3629 /* Empty unnamed enum OK */
3631 pedwarn (input_location
, 0,
3632 "unnamed struct/union that defines no instances");
3636 else if (!declspecs
->tag_defined_p
3637 && declspecs
->storage_class
!= csc_none
)
3640 pedwarn (input_location
, 0,
3641 "empty declaration with storage class specifier "
3642 "does not redeclare tag");
3644 pending_xref_error ();
3646 else if (!declspecs
->tag_defined_p
3647 && (declspecs
->const_p
3648 || declspecs
->volatile_p
3649 || declspecs
->restrict_p
3650 || declspecs
->address_space
))
3653 pedwarn (input_location
, 0,
3654 "empty declaration with type qualifier "
3655 "does not redeclare tag");
3657 pending_xref_error ();
3661 pending_invalid_xref
= 0;
3662 t
= lookup_tag (code
, name
, 1, NULL
);
3666 t
= make_node (code
);
3667 pushtag (input_location
, name
, t
);
3673 if (warned
!= 1 && !in_system_header
)
3675 pedwarn (input_location
, 0,
3676 "useless type name in empty declaration");
3681 else if (warned
!= 1 && !in_system_header
&& declspecs
->typedef_p
)
3683 pedwarn (input_location
, 0, "useless type name in empty declaration");
3687 pending_invalid_xref
= 0;
3689 if (declspecs
->inline_p
)
3691 error ("%<inline%> in empty declaration");
3695 if (current_scope
== file_scope
&& declspecs
->storage_class
== csc_auto
)
3697 error ("%<auto%> in file-scope empty declaration");
3701 if (current_scope
== file_scope
&& declspecs
->storage_class
== csc_register
)
3703 error ("%<register%> in file-scope empty declaration");
3707 if (!warned
&& !in_system_header
&& declspecs
->storage_class
!= csc_none
)
3709 warning (0, "useless storage class specifier in empty declaration");
3713 if (!warned
&& !in_system_header
&& declspecs
->thread_p
)
3715 warning (0, "useless %<__thread%> in empty declaration");
3719 if (!warned
&& !in_system_header
&& (declspecs
->const_p
3720 || declspecs
->volatile_p
3721 || declspecs
->restrict_p
3722 || declspecs
->address_space
))
3724 warning (0, "useless type qualifier in empty declaration");
3731 pedwarn (input_location
, 0, "empty declaration");
3736 /* Return the qualifiers from SPECS as a bitwise OR of TYPE_QUAL_*
3737 bits. SPECS represents declaration specifiers that the grammar
3738 only permits to contain type qualifiers and attributes. */
3741 quals_from_declspecs (const struct c_declspecs
*specs
)
3743 int quals
= ((specs
->const_p
? TYPE_QUAL_CONST
: 0)
3744 | (specs
->volatile_p
? TYPE_QUAL_VOLATILE
: 0)
3745 | (specs
->restrict_p
? TYPE_QUAL_RESTRICT
: 0)
3746 | (ENCODE_QUAL_ADDR_SPACE (specs
->address_space
)));
3747 gcc_assert (!specs
->type
3748 && !specs
->decl_attr
3749 && specs
->typespec_word
== cts_none
3750 && specs
->storage_class
== csc_none
3751 && !specs
->typedef_p
3752 && !specs
->explicit_signed_p
3753 && !specs
->deprecated_p
3755 && !specs
->long_long_p
3758 && !specs
->unsigned_p
3759 && !specs
->complex_p
3761 && !specs
->thread_p
);
3765 /* Construct an array declarator. LOC is the location of the
3766 beginning of the array (usually the opening brace). EXPR is the
3767 expression inside [], or NULL_TREE. QUALS are the type qualifiers
3768 inside the [] (to be applied to the pointer to which a parameter
3769 array is converted). STATIC_P is true if "static" is inside the
3770 [], false otherwise. VLA_UNSPEC_P is true if the array is [*], a
3771 VLA of unspecified length which is nevertheless a complete type,
3772 false otherwise. The field for the contained declarator is left to
3773 be filled in by set_array_declarator_inner. */
3775 struct c_declarator
*
3776 build_array_declarator (location_t loc
,
3777 tree expr
, struct c_declspecs
*quals
, bool static_p
,
3780 struct c_declarator
*declarator
= XOBNEW (&parser_obstack
,
3781 struct c_declarator
);
3782 declarator
->id_loc
= loc
;
3783 declarator
->kind
= cdk_array
;
3784 declarator
->declarator
= 0;
3785 declarator
->u
.array
.dimen
= expr
;
3788 declarator
->u
.array
.attrs
= quals
->attrs
;
3789 declarator
->u
.array
.quals
= quals_from_declspecs (quals
);
3793 declarator
->u
.array
.attrs
= NULL_TREE
;
3794 declarator
->u
.array
.quals
= 0;
3796 declarator
->u
.array
.static_p
= static_p
;
3797 declarator
->u
.array
.vla_unspec_p
= vla_unspec_p
;
3800 if (static_p
|| quals
!= NULL
)
3801 pedwarn (loc
, OPT_pedantic
,
3802 "ISO C90 does not support %<static%> or type "
3803 "qualifiers in parameter array declarators");
3805 pedwarn (loc
, OPT_pedantic
,
3806 "ISO C90 does not support %<[*]%> array declarators");
3810 if (!current_scope
->parm_flag
)
3813 error_at (loc
, "%<[*]%> not allowed in other than "
3814 "function prototype scope");
3815 declarator
->u
.array
.vla_unspec_p
= false;
3818 current_scope
->had_vla_unspec
= true;
3823 /* Set the contained declarator of an array declarator. DECL is the
3824 declarator, as constructed by build_array_declarator; INNER is what
3825 appears on the left of the []. */
3827 struct c_declarator
*
3828 set_array_declarator_inner (struct c_declarator
*decl
,
3829 struct c_declarator
*inner
)
3831 decl
->declarator
= inner
;
3835 /* INIT is a constructor that forms DECL's initializer. If the final
3836 element initializes a flexible array field, add the size of that
3837 initializer to DECL's size. */
3840 add_flexible_array_elts_to_size (tree decl
, tree init
)
3844 if (VEC_empty (constructor_elt
, CONSTRUCTOR_ELTS (init
)))
3847 elt
= VEC_last (constructor_elt
, CONSTRUCTOR_ELTS (init
))->value
;
3848 type
= TREE_TYPE (elt
);
3849 if (TREE_CODE (type
) == ARRAY_TYPE
3850 && TYPE_SIZE (type
) == NULL_TREE
3851 && TYPE_DOMAIN (type
) != NULL_TREE
3852 && TYPE_MAX_VALUE (TYPE_DOMAIN (type
)) == NULL_TREE
)
3854 complete_array_type (&type
, elt
, false);
3856 = size_binop (PLUS_EXPR
, DECL_SIZE (decl
), TYPE_SIZE (type
));
3857 DECL_SIZE_UNIT (decl
)
3858 = size_binop (PLUS_EXPR
, DECL_SIZE_UNIT (decl
), TYPE_SIZE_UNIT (type
));
3862 /* Decode a "typename", such as "int **", returning a ..._TYPE node.
3863 Set *EXPR, if EXPR not NULL, to any expression to be evaluated
3864 before the type name, and set *EXPR_CONST_OPERANDS, if
3865 EXPR_CONST_OPERANDS not NULL, to indicate whether the type name may
3866 appear in a constant expression. */
3869 groktypename (struct c_type_name
*type_name
, tree
*expr
,
3870 bool *expr_const_operands
)
3873 tree attrs
= type_name
->specs
->attrs
;
3875 type_name
->specs
->attrs
= NULL_TREE
;
3877 type
= grokdeclarator (type_name
->declarator
, type_name
->specs
, TYPENAME
,
3878 false, NULL
, &attrs
, expr
, expr_const_operands
,
3881 /* Apply attributes. */
3882 decl_attributes (&type
, attrs
, 0);
3887 /* Decode a declarator in an ordinary declaration or data definition.
3888 This is called as soon as the type information and variable name
3889 have been parsed, before parsing the initializer if any.
3890 Here we create the ..._DECL node, fill in its type,
3891 and put it on the list of decls for the current context.
3892 The ..._DECL node is returned as the value.
3894 Exception: for arrays where the length is not specified,
3895 the type is left null, to be filled in by `finish_decl'.
3897 Function definitions do not come here; they go to start_function
3898 instead. However, external and forward declarations of functions
3899 do go through here. Structure field declarations are done by
3900 grokfield and not through here. */
3903 start_decl (struct c_declarator
*declarator
, struct c_declspecs
*declspecs
,
3904 bool initialized
, tree attributes
)
3908 tree expr
= NULL_TREE
;
3909 enum deprecated_states deprecated_state
= DEPRECATED_NORMAL
;
3911 /* An object declared as __attribute__((deprecated)) suppresses
3912 warnings of uses of other deprecated items. */
3913 if (lookup_attribute ("deprecated", attributes
))
3914 deprecated_state
= DEPRECATED_SUPPRESS
;
3916 decl
= grokdeclarator (declarator
, declspecs
,
3917 NORMAL
, initialized
, NULL
, &attributes
, &expr
, NULL
,
3925 if (TREE_CODE (decl
) != FUNCTION_DECL
&& MAIN_NAME_P (DECL_NAME (decl
)))
3926 warning (OPT_Wmain
, "%q+D is usually a function", decl
);
3929 /* Is it valid for this decl to have an initializer at all?
3930 If not, set INITIALIZED to zero, which will indirectly
3931 tell 'finish_decl' to ignore the initializer once it is parsed. */
3932 switch (TREE_CODE (decl
))
3935 error ("typedef %qD is initialized (use __typeof__ instead)", decl
);
3940 error ("function %qD is initialized like a variable", decl
);
3945 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3946 error ("parameter %qD is initialized", decl
);
3951 /* Don't allow initializations for incomplete types except for
3952 arrays which might be completed by the initialization. */
3954 /* This can happen if the array size is an undefined macro.
3955 We already gave a warning, so we don't need another one. */
3956 if (TREE_TYPE (decl
) == error_mark_node
)
3958 else if (COMPLETE_TYPE_P (TREE_TYPE (decl
)))
3960 /* A complete type is ok if size is fixed. */
3962 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl
))) != INTEGER_CST
3963 || C_DECL_VARIABLE_SIZE (decl
))
3965 error ("variable-sized object may not be initialized");
3969 else if (TREE_CODE (TREE_TYPE (decl
)) != ARRAY_TYPE
)
3971 error ("variable %qD has initializer but incomplete type", decl
);
3974 else if (C_DECL_VARIABLE_SIZE (decl
))
3976 /* Although C99 is unclear about whether incomplete arrays
3977 of VLAs themselves count as VLAs, it does not make
3978 sense to permit them to be initialized given that
3979 ordinary VLAs may not be initialized. */
3980 error ("variable-sized object may not be initialized");
3987 if (current_scope
== file_scope
)
3988 TREE_STATIC (decl
) = 1;
3990 /* Tell 'pushdecl' this is an initialized decl
3991 even though we don't yet have the initializer expression.
3992 Also tell 'finish_decl' it may store the real initializer. */
3993 DECL_INITIAL (decl
) = error_mark_node
;
3996 /* If this is a function declaration, write a record describing it to the
3997 prototypes file (if requested). */
3999 if (TREE_CODE (decl
) == FUNCTION_DECL
)
4000 gen_aux_info_record (decl
, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl
)) != 0);
4002 /* ANSI specifies that a tentative definition which is not merged with
4003 a non-tentative definition behaves exactly like a definition with an
4004 initializer equal to zero. (Section 3.7.2)
4006 -fno-common gives strict ANSI behavior, though this tends to break
4007 a large body of code that grew up without this rule.
4009 Thread-local variables are never common, since there's no entrenched
4010 body of code to break, and it allows more efficient variable references
4011 in the presence of dynamic linking. */
4013 if (TREE_CODE (decl
) == VAR_DECL
4015 && TREE_PUBLIC (decl
)
4016 && !DECL_THREAD_LOCAL_P (decl
)
4018 DECL_COMMON (decl
) = 1;
4020 /* Set attributes here so if duplicate decl, will have proper attributes. */
4021 decl_attributes (&decl
, attributes
, 0);
4023 /* Handle gnu_inline attribute. */
4024 if (declspecs
->inline_p
4025 && !flag_gnu89_inline
4026 && TREE_CODE (decl
) == FUNCTION_DECL
4027 && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl
))
4028 || current_function_decl
))
4030 if (declspecs
->storage_class
== csc_auto
&& current_scope
!= file_scope
)
4032 else if (declspecs
->storage_class
!= csc_static
)
4033 DECL_EXTERNAL (decl
) = !DECL_EXTERNAL (decl
);
4036 if (TREE_CODE (decl
) == FUNCTION_DECL
4037 && targetm
.calls
.promote_prototypes (TREE_TYPE (decl
)))
4039 struct c_declarator
*ce
= declarator
;
4041 if (ce
->kind
== cdk_pointer
)
4042 ce
= declarator
->declarator
;
4043 if (ce
->kind
== cdk_function
)
4045 tree args
= ce
->u
.arg_info
->parms
;
4046 for (; args
; args
= DECL_CHAIN (args
))
4048 tree type
= TREE_TYPE (args
);
4049 if (type
&& INTEGRAL_TYPE_P (type
)
4050 && TYPE_PRECISION (type
) < TYPE_PRECISION (integer_type_node
))
4051 DECL_ARG_TYPE (args
) = integer_type_node
;
4056 if (TREE_CODE (decl
) == FUNCTION_DECL
4057 && DECL_DECLARED_INLINE_P (decl
)
4058 && DECL_UNINLINABLE (decl
)
4059 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl
)))
4060 warning (OPT_Wattributes
, "inline function %q+D given attribute noinline",
4063 /* C99 6.7.4p3: An inline definition of a function with external
4064 linkage shall not contain a definition of a modifiable object
4065 with static storage duration... */
4066 if (TREE_CODE (decl
) == VAR_DECL
4067 && current_scope
!= file_scope
4068 && TREE_STATIC (decl
)
4069 && !TREE_READONLY (decl
)
4070 && DECL_DECLARED_INLINE_P (current_function_decl
)
4071 && DECL_EXTERNAL (current_function_decl
))
4072 record_inline_static (input_location
, current_function_decl
,
4073 decl
, csi_modifiable
);
4075 /* Add this decl to the current scope.
4076 TEM may equal DECL or it may be a previous decl of the same name. */
4077 tem
= pushdecl (decl
);
4079 if (initialized
&& DECL_EXTERNAL (tem
))
4081 DECL_EXTERNAL (tem
) = 0;
4082 TREE_STATIC (tem
) = 1;
4088 /* Subroutine of finish_decl. TYPE is the type of an uninitialized object
4089 DECL or the non-array element type if DECL is an uninitialized array.
4090 If that type has a const member, diagnose this. */
4093 diagnose_uninitialized_cst_member (tree decl
, tree type
)
4096 for (field
= TYPE_FIELDS (type
); field
; field
= TREE_CHAIN (field
))
4099 if (TREE_CODE (field
) != FIELD_DECL
)
4101 field_type
= strip_array_types (TREE_TYPE (field
));
4103 if (TYPE_QUALS (field_type
) & TYPE_QUAL_CONST
)
4105 warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wc___compat
,
4106 "uninitialized const member in %qT is invalid in C++",
4107 strip_array_types (TREE_TYPE (decl
)));
4108 inform (DECL_SOURCE_LOCATION (field
), "%qD should be initialized", field
);
4111 if (TREE_CODE (field_type
) == RECORD_TYPE
4112 || TREE_CODE (field_type
) == UNION_TYPE
)
4113 diagnose_uninitialized_cst_member (decl
, field_type
);
4117 /* Finish processing of a declaration;
4118 install its initial value.
4119 If ORIGTYPE is not NULL_TREE, it is the original type of INIT.
4120 If the length of an array type is not known before,
4121 it must be determined now, from the initial value, or it is an error.
4123 INIT_LOC is the location of the initial value. */
4126 finish_decl (tree decl
, location_t init_loc
, tree init
,
4127 tree origtype
, tree asmspec_tree
)
4130 bool was_incomplete
= (DECL_SIZE (decl
) == 0);
4131 const char *asmspec
= 0;
4133 /* If a name was specified, get the string. */
4134 if ((TREE_CODE (decl
) == FUNCTION_DECL
|| TREE_CODE (decl
) == VAR_DECL
)
4135 && DECL_FILE_SCOPE_P (decl
))
4136 asmspec_tree
= maybe_apply_renaming_pragma (decl
, asmspec_tree
);
4138 asmspec
= TREE_STRING_POINTER (asmspec_tree
);
4140 if (TREE_CODE (decl
) == VAR_DECL
4141 && TREE_STATIC (decl
)
4142 && global_bindings_p ())
4143 /* So decl is a global variable. Record the types it uses
4144 so that we can decide later to emit debug info for them. */
4145 record_types_used_by_current_var_decl (decl
);
4147 /* If `start_decl' didn't like having an initialization, ignore it now. */
4148 if (init
!= 0 && DECL_INITIAL (decl
) == 0)
4151 /* Don't crash if parm is initialized. */
4152 if (TREE_CODE (decl
) == PARM_DECL
)
4156 store_init_value (init_loc
, decl
, init
, origtype
);
4158 if (c_dialect_objc () && (TREE_CODE (decl
) == VAR_DECL
4159 || TREE_CODE (decl
) == FUNCTION_DECL
4160 || TREE_CODE (decl
) == FIELD_DECL
))
4161 objc_check_decl (decl
);
4163 type
= TREE_TYPE (decl
);
4165 /* Deduce size of array from initialization, if not already known. */
4166 if (TREE_CODE (type
) == ARRAY_TYPE
4167 && TYPE_DOMAIN (type
) == 0
4168 && TREE_CODE (decl
) != TYPE_DECL
)
4171 = (TREE_STATIC (decl
)
4172 /* Even if pedantic, an external linkage array
4173 may have incomplete type at first. */
4174 ? pedantic
&& !TREE_PUBLIC (decl
)
4175 : !DECL_EXTERNAL (decl
));
4177 = complete_array_type (&TREE_TYPE (decl
), DECL_INITIAL (decl
),
4180 /* Get the completed type made by complete_array_type. */
4181 type
= TREE_TYPE (decl
);
4186 error ("initializer fails to determine size of %q+D", decl
);
4191 error ("array size missing in %q+D", decl
);
4192 /* If a `static' var's size isn't known,
4193 make it extern as well as static, so it does not get
4195 If it is not `static', then do not mark extern;
4196 finish_incomplete_decl will give it a default size
4197 and it will get allocated. */
4198 else if (!pedantic
&& TREE_STATIC (decl
) && !TREE_PUBLIC (decl
))
4199 DECL_EXTERNAL (decl
) = 1;
4203 error ("zero or negative size array %q+D", decl
);
4207 /* For global variables, update the copy of the type that
4208 exists in the binding. */
4209 if (TREE_PUBLIC (decl
))
4211 struct c_binding
*b_ext
= I_SYMBOL_BINDING (DECL_NAME (decl
));
4212 while (b_ext
&& !B_IN_EXTERNAL_SCOPE (b_ext
))
4213 b_ext
= b_ext
->shadowed
;
4217 b_ext
->u
.type
= composite_type (b_ext
->u
.type
, type
);
4219 b_ext
->u
.type
= type
;
4228 if (DECL_INITIAL (decl
))
4229 TREE_TYPE (DECL_INITIAL (decl
)) = type
;
4231 layout_decl (decl
, 0);
4234 if (TREE_CODE (decl
) == VAR_DECL
)
4236 if (init
&& TREE_CODE (init
) == CONSTRUCTOR
)
4237 add_flexible_array_elts_to_size (decl
, init
);
4239 if (DECL_SIZE (decl
) == 0 && TREE_TYPE (decl
) != error_mark_node
4240 && COMPLETE_TYPE_P (TREE_TYPE (decl
)))
4241 layout_decl (decl
, 0);
4243 if (DECL_SIZE (decl
) == 0
4244 /* Don't give an error if we already gave one earlier. */
4245 && TREE_TYPE (decl
) != error_mark_node
4246 && (TREE_STATIC (decl
)
4247 /* A static variable with an incomplete type
4248 is an error if it is initialized.
4249 Also if it is not file scope.
4250 Otherwise, let it through, but if it is not `extern'
4251 then it may cause an error message later. */
4252 ? (DECL_INITIAL (decl
) != 0
4253 || !DECL_FILE_SCOPE_P (decl
))
4254 /* An automatic variable with an incomplete type
4256 : !DECL_EXTERNAL (decl
)))
4258 error ("storage size of %q+D isn%'t known", decl
);
4259 TREE_TYPE (decl
) = error_mark_node
;
4262 if ((DECL_EXTERNAL (decl
) || TREE_STATIC (decl
))
4263 && DECL_SIZE (decl
) != 0)
4265 if (TREE_CODE (DECL_SIZE (decl
)) == INTEGER_CST
)
4266 constant_expression_warning (DECL_SIZE (decl
));
4269 error ("storage size of %q+D isn%'t constant", decl
);
4270 TREE_TYPE (decl
) = error_mark_node
;
4274 if (TREE_USED (type
))
4276 TREE_USED (decl
) = 1;
4277 DECL_READ_P (decl
) = 1;
4281 /* If this is a function and an assembler name is specified, reset DECL_RTL
4282 so we can give it its new name. Also, update built_in_decls if it
4283 was a normal built-in. */
4284 if (TREE_CODE (decl
) == FUNCTION_DECL
&& asmspec
)
4286 if (DECL_BUILT_IN_CLASS (decl
) == BUILT_IN_NORMAL
)
4287 set_builtin_user_assembler_name (decl
, asmspec
);
4288 set_user_assembler_name (decl
, asmspec
);
4291 /* If #pragma weak was used, mark the decl weak now. */
4292 maybe_apply_pragma_weak (decl
);
4294 /* Output the assembler code and/or RTL code for variables and functions,
4295 unless the type is an undefined structure or union.
4296 If not, it will get done when the type is completed. */
4298 if (TREE_CODE (decl
) == VAR_DECL
|| TREE_CODE (decl
) == FUNCTION_DECL
)
4300 /* Determine the ELF visibility. */
4301 if (TREE_PUBLIC (decl
))
4302 c_determine_visibility (decl
);
4304 /* This is a no-op in c-lang.c or something real in objc-act.c. */
4305 if (c_dialect_objc ())
4306 objc_check_decl (decl
);
4310 /* If this is not a static variable, issue a warning.
4311 It doesn't make any sense to give an ASMSPEC for an
4312 ordinary, non-register local variable. Historically,
4313 GCC has accepted -- but ignored -- the ASMSPEC in
4315 if (!DECL_FILE_SCOPE_P (decl
)
4316 && TREE_CODE (decl
) == VAR_DECL
4317 && !C_DECL_REGISTER (decl
)
4318 && !TREE_STATIC (decl
))
4319 warning (0, "ignoring asm-specifier for non-static local "
4320 "variable %q+D", decl
);
4322 set_user_assembler_name (decl
, asmspec
);
4325 if (DECL_FILE_SCOPE_P (decl
))
4327 if (DECL_INITIAL (decl
) == NULL_TREE
4328 || DECL_INITIAL (decl
) == error_mark_node
)
4329 /* Don't output anything
4330 when a tentative file-scope definition is seen.
4331 But at end of compilation, do output code for them. */
4332 DECL_DEFER_OUTPUT (decl
) = 1;
4333 rest_of_decl_compilation (decl
, true, 0);
4337 /* In conjunction with an ASMSPEC, the `register'
4338 keyword indicates that we should place the variable
4339 in a particular register. */
4340 if (asmspec
&& C_DECL_REGISTER (decl
))
4342 DECL_HARD_REGISTER (decl
) = 1;
4343 /* This cannot be done for a structure with volatile
4344 fields, on which DECL_REGISTER will have been
4346 if (!DECL_REGISTER (decl
))
4347 error ("cannot put object with volatile field into register");
4350 if (TREE_CODE (decl
) != FUNCTION_DECL
)
4352 /* If we're building a variable sized type, and we might be
4353 reachable other than via the top of the current binding
4354 level, then create a new BIND_EXPR so that we deallocate
4355 the object at the right time. */
4356 /* Note that DECL_SIZE can be null due to errors. */
4357 if (DECL_SIZE (decl
)
4358 && !TREE_CONSTANT (DECL_SIZE (decl
))
4359 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list
))
4362 bind
= build3 (BIND_EXPR
, void_type_node
, NULL
, NULL
, NULL
);
4363 TREE_SIDE_EFFECTS (bind
) = 1;
4365 BIND_EXPR_BODY (bind
) = push_stmt_list ();
4367 add_stmt (build_stmt (DECL_SOURCE_LOCATION (decl
),
4373 if (!DECL_FILE_SCOPE_P (decl
))
4375 /* Recompute the RTL of a local array now
4376 if it used to be an incomplete type. */
4378 && !TREE_STATIC (decl
) && !DECL_EXTERNAL (decl
))
4380 /* If we used it already as memory, it must stay in memory. */
4381 TREE_ADDRESSABLE (decl
) = TREE_USED (decl
);
4382 /* If it's still incomplete now, no init will save it. */
4383 if (DECL_SIZE (decl
) == 0)
4384 DECL_INITIAL (decl
) = 0;
4389 if (TREE_CODE (decl
) == TYPE_DECL
)
4391 if (!DECL_FILE_SCOPE_P (decl
)
4392 && variably_modified_type_p (TREE_TYPE (decl
), NULL_TREE
))
4393 add_stmt (build_stmt (DECL_SOURCE_LOCATION (decl
), DECL_EXPR
, decl
));
4395 rest_of_decl_compilation (decl
, DECL_FILE_SCOPE_P (decl
), 0);
4398 /* At the end of a declaration, throw away any variable type sizes
4399 of types defined inside that declaration. There is no use
4400 computing them in the following function definition. */
4401 if (current_scope
== file_scope
)
4402 get_pending_sizes ();
4404 /* Install a cleanup (aka destructor) if one was given. */
4405 if (TREE_CODE (decl
) == VAR_DECL
&& !TREE_STATIC (decl
))
4407 tree attr
= lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl
));
4410 tree cleanup_id
= TREE_VALUE (TREE_VALUE (attr
));
4411 tree cleanup_decl
= lookup_name (cleanup_id
);
4415 /* Build "cleanup(&decl)" for the destructor. */
4416 cleanup
= build_unary_op (input_location
, ADDR_EXPR
, decl
, 0);
4417 vec
= VEC_alloc (tree
, gc
, 1);
4418 VEC_quick_push (tree
, vec
, cleanup
);
4419 cleanup
= build_function_call_vec (DECL_SOURCE_LOCATION (decl
),
4420 cleanup_decl
, vec
, NULL
);
4421 VEC_free (tree
, gc
, vec
);
4423 /* Don't warn about decl unused; the cleanup uses it. */
4424 TREE_USED (decl
) = 1;
4425 TREE_USED (cleanup_decl
) = 1;
4426 DECL_READ_P (decl
) = 1;
4428 push_cleanup (decl
, cleanup
, false);
4433 && TREE_CODE (decl
) == VAR_DECL
4434 && !DECL_EXTERNAL (decl
)
4435 && DECL_INITIAL (decl
) == NULL_TREE
)
4437 type
= strip_array_types (type
);
4438 if (TREE_READONLY (decl
))
4439 warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wc___compat
,
4440 "uninitialized const %qD is invalid in C++", decl
);
4441 else if ((TREE_CODE (type
) == RECORD_TYPE
4442 || TREE_CODE (type
) == UNION_TYPE
)
4443 && C_TYPE_FIELDS_READONLY (type
))
4444 diagnose_uninitialized_cst_member (decl
, type
);
4448 /* Given a parsed parameter declaration, decode it into a PARM_DECL. */
4451 grokparm (const struct c_parm
*parm
)
4453 tree attrs
= parm
->attrs
;
4454 tree decl
= grokdeclarator (parm
->declarator
, parm
->specs
, PARM
, false,
4455 NULL
, &attrs
, NULL
, NULL
, DEPRECATED_NORMAL
);
4457 decl_attributes (&decl
, attrs
, 0);
4462 /* Given a parsed parameter declaration, decode it into a PARM_DECL
4463 and push that on the current scope. */
4466 push_parm_decl (const struct c_parm
*parm
)
4468 tree attrs
= parm
->attrs
;
4471 decl
= grokdeclarator (parm
->declarator
, parm
->specs
, PARM
, false, NULL
,
4472 &attrs
, NULL
, NULL
, DEPRECATED_NORMAL
);
4473 decl_attributes (&decl
, attrs
, 0);
4475 decl
= pushdecl (decl
);
4477 finish_decl (decl
, input_location
, NULL_TREE
, NULL_TREE
, NULL_TREE
);
4480 /* Mark all the parameter declarations to date as forward decls.
4481 Also diagnose use of this extension. */
4484 mark_forward_parm_decls (void)
4486 struct c_binding
*b
;
4488 if (pedantic
&& !current_scope
->warned_forward_parm_decls
)
4490 pedwarn (input_location
, OPT_pedantic
,
4491 "ISO C forbids forward parameter declarations");
4492 current_scope
->warned_forward_parm_decls
= true;
4495 for (b
= current_scope
->bindings
; b
; b
= b
->prev
)
4496 if (TREE_CODE (b
->decl
) == PARM_DECL
)
4497 TREE_ASM_WRITTEN (b
->decl
) = 1;
4500 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
4501 literal, which may be an incomplete array type completed by the
4502 initializer; INIT is a CONSTRUCTOR at LOC that initializes the compound
4503 literal. NON_CONST is true if the initializers contain something
4504 that cannot occur in a constant expression. */
4507 build_compound_literal (location_t loc
, tree type
, tree init
, bool non_const
)
4509 /* We do not use start_decl here because we have a type, not a declarator;
4510 and do not use finish_decl because the decl should be stored inside
4511 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_EXPR. */
4516 if (type
== error_mark_node
4517 || init
== error_mark_node
)
4518 return error_mark_node
;
4520 decl
= build_decl (loc
, VAR_DECL
, NULL_TREE
, type
);
4521 DECL_EXTERNAL (decl
) = 0;
4522 TREE_PUBLIC (decl
) = 0;
4523 TREE_STATIC (decl
) = (current_scope
== file_scope
);
4524 DECL_CONTEXT (decl
) = current_function_decl
;
4525 TREE_USED (decl
) = 1;
4526 DECL_READ_P (decl
) = 1;
4527 TREE_TYPE (decl
) = type
;
4528 TREE_READONLY (decl
) = TYPE_READONLY (type
);
4529 store_init_value (loc
, decl
, init
, NULL_TREE
);
4531 if (TREE_CODE (type
) == ARRAY_TYPE
&& !COMPLETE_TYPE_P (type
))
4533 int failure
= complete_array_type (&TREE_TYPE (decl
),
4534 DECL_INITIAL (decl
), true);
4535 gcc_assert (!failure
);
4537 type
= TREE_TYPE (decl
);
4538 TREE_TYPE (DECL_INITIAL (decl
)) = type
;
4541 if (type
== error_mark_node
|| !COMPLETE_TYPE_P (type
))
4542 return error_mark_node
;
4544 stmt
= build_stmt (DECL_SOURCE_LOCATION (decl
), DECL_EXPR
, decl
);
4545 complit
= build1 (COMPOUND_LITERAL_EXPR
, type
, stmt
);
4546 TREE_SIDE_EFFECTS (complit
) = 1;
4548 layout_decl (decl
, 0);
4550 if (TREE_STATIC (decl
))
4552 /* This decl needs a name for the assembler output. */
4553 set_compound_literal_name (decl
);
4554 DECL_DEFER_OUTPUT (decl
) = 1;
4555 DECL_COMDAT (decl
) = 1;
4556 DECL_ARTIFICIAL (decl
) = 1;
4557 DECL_IGNORED_P (decl
) = 1;
4559 rest_of_decl_compilation (decl
, 1, 0);
4564 complit
= build2 (C_MAYBE_CONST_EXPR
, type
, NULL
, complit
);
4565 C_MAYBE_CONST_EXPR_NON_CONST (complit
) = 1;
4571 /* Check the type of a compound literal. Here we just check that it
4572 is valid for C++. */
4575 check_compound_literal_type (location_t loc
, struct c_type_name
*type_name
)
4577 if (warn_cxx_compat
&& type_name
->specs
->tag_defined_p
)
4578 warning_at (loc
, OPT_Wc___compat
,
4579 "defining a type in a compound literal is invalid in C++");
4582 /* Determine whether TYPE is a structure with a flexible array member,
4583 or a union containing such a structure (possibly recursively). */
4586 flexible_array_type_p (tree type
)
4589 switch (TREE_CODE (type
))
4592 x
= TYPE_FIELDS (type
);
4595 while (DECL_CHAIN (x
) != NULL_TREE
)
4597 if (TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
4598 && TYPE_SIZE (TREE_TYPE (x
)) == NULL_TREE
4599 && TYPE_DOMAIN (TREE_TYPE (x
)) != NULL_TREE
4600 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x
))) == NULL_TREE
)
4604 for (x
= TYPE_FIELDS (type
); x
!= NULL_TREE
; x
= DECL_CHAIN (x
))
4606 if (flexible_array_type_p (TREE_TYPE (x
)))
4615 /* Performs sanity checks on the TYPE and WIDTH of the bit-field NAME,
4616 replacing with appropriate values if they are invalid. */
4618 check_bitfield_type_and_width (tree
*type
, tree
*width
, tree orig_name
)
4621 unsigned int max_width
;
4622 unsigned HOST_WIDE_INT w
;
4623 const char *name
= (orig_name
4624 ? identifier_to_locale (IDENTIFIER_POINTER (orig_name
))
4625 : _("<anonymous>"));
4627 /* Detect and ignore out of range field width and process valid
4629 if (!INTEGRAL_TYPE_P (TREE_TYPE (*width
)))
4631 error ("bit-field %qs width not an integer constant", name
);
4632 *width
= integer_one_node
;
4636 if (TREE_CODE (*width
) != INTEGER_CST
)
4638 *width
= c_fully_fold (*width
, false, NULL
);
4639 if (TREE_CODE (*width
) == INTEGER_CST
)
4640 pedwarn (input_location
, OPT_pedantic
,
4641 "bit-field %qs width not an integer constant expression",
4644 if (TREE_CODE (*width
) != INTEGER_CST
)
4646 error ("bit-field %qs width not an integer constant", name
);
4647 *width
= integer_one_node
;
4649 constant_expression_warning (*width
);
4650 if (tree_int_cst_sgn (*width
) < 0)
4652 error ("negative width in bit-field %qs", name
);
4653 *width
= integer_one_node
;
4655 else if (integer_zerop (*width
) && orig_name
)
4657 error ("zero width for bit-field %qs", name
);
4658 *width
= integer_one_node
;
4662 /* Detect invalid bit-field type. */
4663 if (TREE_CODE (*type
) != INTEGER_TYPE
4664 && TREE_CODE (*type
) != BOOLEAN_TYPE
4665 && TREE_CODE (*type
) != ENUMERAL_TYPE
)
4667 error ("bit-field %qs has invalid type", name
);
4668 *type
= unsigned_type_node
;
4671 type_mv
= TYPE_MAIN_VARIANT (*type
);
4672 if (!in_system_header
4673 && type_mv
!= integer_type_node
4674 && type_mv
!= unsigned_type_node
4675 && type_mv
!= boolean_type_node
)
4676 pedwarn (input_location
, OPT_pedantic
,
4677 "type of bit-field %qs is a GCC extension", name
);
4679 max_width
= TYPE_PRECISION (*type
);
4681 if (0 < compare_tree_int (*width
, max_width
))
4683 error ("width of %qs exceeds its type", name
);
4685 *width
= build_int_cst (NULL_TREE
, w
);
4688 w
= tree_low_cst (*width
, 1);
4690 if (TREE_CODE (*type
) == ENUMERAL_TYPE
)
4692 struct lang_type
*lt
= TYPE_LANG_SPECIFIC (*type
);
4694 || w
< tree_int_cst_min_precision (lt
->enum_min
, TYPE_UNSIGNED (*type
))
4695 || w
< tree_int_cst_min_precision (lt
->enum_max
, TYPE_UNSIGNED (*type
)))
4696 warning (0, "%qs is narrower than values of its type", name
);
4702 /* Print warning about variable length array if necessary. */
4705 warn_variable_length_array (tree name
, tree size
)
4707 int const_size
= TREE_CONSTANT (size
);
4709 if (!flag_isoc99
&& pedantic
&& warn_vla
!= 0)
4714 pedwarn (input_location
, OPT_Wvla
,
4715 "ISO C90 forbids array %qE whose size "
4716 "can%'t be evaluated",
4719 pedwarn (input_location
, OPT_Wvla
, "ISO C90 forbids array whose size "
4720 "can%'t be evaluated");
4725 pedwarn (input_location
, OPT_Wvla
,
4726 "ISO C90 forbids variable length array %qE",
4729 pedwarn (input_location
, OPT_Wvla
, "ISO C90 forbids variable length array");
4732 else if (warn_vla
> 0)
4738 "the size of array %qE can"
4739 "%'t be evaluated", name
);
4742 "the size of array can %'t be evaluated");
4748 "variable length array %qE is used",
4752 "variable length array is used");
4757 /* Given a size SIZE that may not be a constant, return a SAVE_EXPR to
4758 serve as the actual size-expression for a type or decl. This is
4759 like variable_size in stor-layout.c, but we make global_bindings_p
4760 return negative to avoid calls to that function from outside the
4761 front end resulting in errors at file scope, then call this version
4762 instead from front-end code. */
4765 c_variable_size (tree size
)
4769 if (TREE_CONSTANT (size
))
4772 size
= save_expr (size
);
4774 save
= skip_simple_arithmetic (size
);
4776 if (cfun
&& cfun
->dont_save_pending_sizes_p
)
4779 if (!global_bindings_p ())
4780 put_pending_size (save
);
4785 /* Given declspecs and a declarator,
4786 determine the name and type of the object declared
4787 and construct a ..._DECL node for it.
4788 (In one case we can return a ..._TYPE node instead.
4789 For invalid input we sometimes return 0.)
4791 DECLSPECS is a c_declspecs structure for the declaration specifiers.
4793 DECL_CONTEXT says which syntactic context this declaration is in:
4794 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
4795 FUNCDEF for a function definition. Like NORMAL but a few different
4796 error messages in each case. Return value may be zero meaning
4797 this definition is too screwy to try to parse.
4798 PARM for a parameter declaration (either within a function prototype
4799 or before a function body). Make a PARM_DECL, or return void_type_node.
4800 TYPENAME if for a typename (in a cast or sizeof).
4801 Don't make a DECL node; just return the ..._TYPE node.
4802 FIELD for a struct or union field; make a FIELD_DECL.
4803 INITIALIZED is true if the decl has an initializer.
4804 WIDTH is non-NULL for bit-fields, and is a pointer to an INTEGER_CST node
4805 representing the width of the bit-field.
4806 DECL_ATTRS points to the list of attributes that should be added to this
4807 decl. Any nested attributes that belong on the decl itself will be
4809 If EXPR is not NULL, any expressions that need to be evaluated as
4810 part of evaluating variably modified types will be stored in *EXPR.
4811 If EXPR_CONST_OPERANDS is not NULL, *EXPR_CONST_OPERANDS will be
4812 set to indicate whether operands in *EXPR can be used in constant
4814 DEPRECATED_STATE is a deprecated_states value indicating whether
4815 deprecation warnings should be suppressed.
4817 In the TYPENAME case, DECLARATOR is really an absolute declarator.
4818 It may also be so in the PARM case, for a prototype where the
4819 argument type is specified but not the name.
4821 This function is where the complicated C meanings of `static'
4822 and `extern' are interpreted. */
4825 grokdeclarator (const struct c_declarator
*declarator
,
4826 struct c_declspecs
*declspecs
,
4827 enum decl_context decl_context
, bool initialized
, tree
*width
,
4828 tree
*decl_attrs
, tree
*expr
, bool *expr_const_operands
,
4829 enum deprecated_states deprecated_state
)
4831 tree type
= declspecs
->type
;
4832 bool threadp
= declspecs
->thread_p
;
4833 enum c_storage_class storage_class
= declspecs
->storage_class
;
4837 int type_quals
= TYPE_UNQUALIFIED
;
4838 tree name
= NULL_TREE
;
4839 bool funcdef_flag
= false;
4840 bool funcdef_syntax
= false;
4841 bool size_varies
= false;
4842 tree decl_attr
= declspecs
->decl_attr
;
4843 int array_ptr_quals
= TYPE_UNQUALIFIED
;
4844 tree array_ptr_attrs
= NULL_TREE
;
4845 int array_parm_static
= 0;
4846 bool array_parm_vla_unspec_p
= false;
4847 tree returned_attrs
= NULL_TREE
;
4848 bool bitfield
= width
!= NULL
;
4850 struct c_arg_info
*arg_info
= 0;
4851 addr_space_t as1
, as2
, address_space
;
4852 location_t loc
= UNKNOWN_LOCATION
;
4855 bool expr_const_operands_dummy
;
4859 if (expr_const_operands
== NULL
)
4860 expr_const_operands
= &expr_const_operands_dummy
;
4862 *expr
= declspecs
->expr
;
4863 *expr_const_operands
= declspecs
->expr_const_operands
;
4865 if (decl_context
== FUNCDEF
)
4866 funcdef_flag
= true, decl_context
= NORMAL
;
4868 /* Look inside a declarator for the name being declared
4869 and get it as an IDENTIFIER_NODE, for an error message. */
4871 const struct c_declarator
*decl
= declarator
;
4882 funcdef_syntax
= (decl
->kind
== cdk_function
);
4883 decl
= decl
->declarator
;
4887 decl
= decl
->declarator
;
4902 gcc_assert (decl_context
== PARM
4903 || decl_context
== TYPENAME
4904 || (decl_context
== FIELD
4905 && declarator
->kind
== cdk_id
));
4906 gcc_assert (!initialized
);
4910 /* A function definition's declarator must have the form of
4911 a function declarator. */
4913 if (funcdef_flag
&& !funcdef_syntax
)
4916 /* If this looks like a function definition, make it one,
4917 even if it occurs where parms are expected.
4918 Then store_parm_decls will reject it and not use it as a parm. */
4919 if (decl_context
== NORMAL
&& !funcdef_flag
&& current_scope
->parm_flag
)
4920 decl_context
= PARM
;
4922 if (declspecs
->deprecated_p
&& deprecated_state
!= DEPRECATED_SUPPRESS
)
4923 warn_deprecated_use (declspecs
->type
, declspecs
->decl_attr
);
4925 if ((decl_context
== NORMAL
|| decl_context
== FIELD
)
4926 && current_scope
== file_scope
4927 && variably_modified_type_p (type
, NULL_TREE
))
4930 error_at (loc
, "variably modified %qE at file scope", name
);
4932 error_at (loc
, "variably modified field at file scope");
4933 type
= integer_type_node
;
4936 size_varies
= C_TYPE_VARIABLE_SIZE (type
) != 0;
4938 /* Diagnose defaulting to "int". */
4940 if (declspecs
->default_int_p
&& !in_system_header
)
4942 /* Issue a warning if this is an ISO C 99 program or if
4943 -Wreturn-type and this is a function, or if -Wimplicit;
4944 prefer the former warning since it is more explicit. */
4945 if ((warn_implicit_int
|| warn_return_type
|| flag_isoc99
)
4947 warn_about_return_type
= 1;
4951 pedwarn_c99 (loc
, flag_isoc99
? 0 : OPT_Wimplicit_int
,
4952 "type defaults to %<int%> in declaration of %qE",
4955 pedwarn_c99 (input_location
, flag_isoc99
? 0 : OPT_Wimplicit_int
,
4956 "type defaults to %<int%> in type name");
4960 /* Adjust the type if a bit-field is being declared,
4961 -funsigned-bitfields applied and the type is not explicitly
4963 if (bitfield
&& !flag_signed_bitfields
&& !declspecs
->explicit_signed_p
4964 && TREE_CODE (type
) == INTEGER_TYPE
)
4965 type
= unsigned_type_for (type
);
4967 /* Figure out the type qualifiers for the declaration. There are
4968 two ways a declaration can become qualified. One is something
4969 like `const int i' where the `const' is explicit. Another is
4970 something like `typedef const int CI; CI i' where the type of the
4971 declaration contains the `const'. A third possibility is that
4972 there is a type qualifier on the element type of a typedefed
4973 array type, in which case we should extract that qualifier so
4974 that c_apply_type_quals_to_decl receives the full list of
4975 qualifiers to work with (C90 is not entirely clear about whether
4976 duplicate qualifiers should be diagnosed in this case, but it
4977 seems most appropriate to do so). */
4978 element_type
= strip_array_types (type
);
4979 constp
= declspecs
->const_p
+ TYPE_READONLY (element_type
);
4980 restrictp
= declspecs
->restrict_p
+ TYPE_RESTRICT (element_type
);
4981 volatilep
= declspecs
->volatile_p
+ TYPE_VOLATILE (element_type
);
4982 as1
= declspecs
->address_space
;
4983 as2
= TYPE_ADDR_SPACE (element_type
);
4984 address_space
= ADDR_SPACE_GENERIC_P (as1
)? as2
: as1
;
4986 if (pedantic
&& !flag_isoc99
)
4989 pedwarn (loc
, OPT_pedantic
, "duplicate %<const%>");
4991 pedwarn (loc
, OPT_pedantic
, "duplicate %<restrict%>");
4993 pedwarn (loc
, OPT_pedantic
, "duplicate %<volatile%>");
4996 if (!ADDR_SPACE_GENERIC_P (as1
) && !ADDR_SPACE_GENERIC_P (as2
) && as1
!= as2
)
4997 error_at (loc
, "conflicting named address spaces (%s vs %s)",
4998 c_addr_space_name (as1
), c_addr_space_name (as2
));
5000 if (!flag_gen_aux_info
&& (TYPE_QUALS (element_type
)))
5001 type
= TYPE_MAIN_VARIANT (type
);
5002 type_quals
= ((constp
? TYPE_QUAL_CONST
: 0)
5003 | (restrictp
? TYPE_QUAL_RESTRICT
: 0)
5004 | (volatilep
? TYPE_QUAL_VOLATILE
: 0)
5005 | ENCODE_QUAL_ADDR_SPACE (address_space
));
5007 /* Warn about storage classes that are invalid for certain
5008 kinds of declarations (parameters, typenames, etc.). */
5012 || storage_class
== csc_auto
5013 || storage_class
== csc_register
5014 || storage_class
== csc_typedef
))
5016 if (storage_class
== csc_auto
)
5018 (current_scope
== file_scope
) ? 0 : OPT_pedantic
,
5019 "function definition declared %<auto%>");
5020 if (storage_class
== csc_register
)
5021 error_at (loc
, "function definition declared %<register%>");
5022 if (storage_class
== csc_typedef
)
5023 error_at (loc
, "function definition declared %<typedef%>");
5025 error_at (loc
, "function definition declared %<__thread%>");
5027 if (storage_class
== csc_auto
5028 || storage_class
== csc_register
5029 || storage_class
== csc_typedef
)
5030 storage_class
= csc_none
;
5032 else if (decl_context
!= NORMAL
&& (storage_class
!= csc_none
|| threadp
))
5034 if (decl_context
== PARM
&& storage_class
== csc_register
)
5038 switch (decl_context
)
5042 error_at (loc
, "storage class specified for structure "
5045 error_at (loc
, "storage class specified for structure field");
5049 error_at (loc
, "storage class specified for parameter %qE",
5052 error_at (loc
, "storage class specified for unnamed parameter");
5055 error_at (loc
, "storage class specified for typename");
5058 storage_class
= csc_none
;
5062 else if (storage_class
== csc_extern
5066 /* 'extern' with initialization is invalid if not at file scope. */
5067 if (current_scope
== file_scope
)
5069 /* It is fine to have 'extern const' when compiling at C
5070 and C++ intersection. */
5071 if (!(warn_cxx_compat
&& constp
))
5072 warning_at (loc
, 0, "%qE initialized and declared %<extern%>",
5076 error_at (loc
, "%qE has both %<extern%> and initializer", name
);
5078 else if (current_scope
== file_scope
)
5080 if (storage_class
== csc_auto
)
5081 error_at (loc
, "file-scope declaration of %qE specifies %<auto%>",
5083 if (pedantic
&& storage_class
== csc_register
)
5084 pedwarn (input_location
, OPT_pedantic
,
5085 "file-scope declaration of %qE specifies %<register%>", name
);
5089 if (storage_class
== csc_extern
&& funcdef_flag
)
5090 error_at (loc
, "nested function %qE declared %<extern%>", name
);
5091 else if (threadp
&& storage_class
== csc_none
)
5093 error_at (loc
, "function-scope %qE implicitly auto and declared "
5100 /* Now figure out the structure of the declarator proper.
5101 Descend through it, creating more complex types, until we reach
5102 the declared identifier (or NULL_TREE, in an absolute declarator).
5103 At each stage we maintain an unqualified version of the type
5104 together with any qualifiers that should be applied to it with
5105 c_build_qualified_type; this way, array types including
5106 multidimensional array types are first built up in unqualified
5107 form and then the qualified form is created with
5108 TYPE_MAIN_VARIANT pointing to the unqualified form. */
5110 while (declarator
&& declarator
->kind
!= cdk_id
)
5112 if (type
== error_mark_node
)
5114 declarator
= declarator
->declarator
;
5118 /* Each level of DECLARATOR is either a cdk_array (for ...[..]),
5119 a cdk_pointer (for *...),
5120 a cdk_function (for ...(...)),
5121 a cdk_attrs (for nested attributes),
5122 or a cdk_id (for the name being declared
5123 or the place in an absolute declarator
5124 where the name was omitted).
5125 For the last case, we have just exited the loop.
5127 At this point, TYPE is the type of elements of an array,
5128 or for a function to return, or for a pointer to point to.
5129 After this sequence of ifs, TYPE is the type of the
5130 array or function or pointer, and DECLARATOR has had its
5131 outermost layer removed. */
5133 if (array_ptr_quals
!= TYPE_UNQUALIFIED
5134 || array_ptr_attrs
!= NULL_TREE
5135 || array_parm_static
)
5137 /* Only the innermost declarator (making a parameter be of
5138 array type which is converted to pointer type)
5139 may have static or type qualifiers. */
5140 error_at (loc
, "static or type qualifiers in non-parameter array declarator");
5141 array_ptr_quals
= TYPE_UNQUALIFIED
;
5142 array_ptr_attrs
= NULL_TREE
;
5143 array_parm_static
= 0;
5146 switch (declarator
->kind
)
5150 /* A declarator with embedded attributes. */
5151 tree attrs
= declarator
->u
.attrs
;
5152 const struct c_declarator
*inner_decl
;
5154 declarator
= declarator
->declarator
;
5155 inner_decl
= declarator
;
5156 while (inner_decl
->kind
== cdk_attrs
)
5157 inner_decl
= inner_decl
->declarator
;
5158 if (inner_decl
->kind
== cdk_id
)
5159 attr_flags
|= (int) ATTR_FLAG_DECL_NEXT
;
5160 else if (inner_decl
->kind
== cdk_function
)
5161 attr_flags
|= (int) ATTR_FLAG_FUNCTION_NEXT
;
5162 else if (inner_decl
->kind
== cdk_array
)
5163 attr_flags
|= (int) ATTR_FLAG_ARRAY_NEXT
;
5164 returned_attrs
= decl_attributes (&type
,
5165 chainon (returned_attrs
, attrs
),
5171 tree itype
= NULL_TREE
;
5172 tree size
= declarator
->u
.array
.dimen
;
5173 /* The index is a signed object `sizetype' bits wide. */
5174 tree index_type
= c_common_signed_type (sizetype
);
5176 array_ptr_quals
= declarator
->u
.array
.quals
;
5177 array_ptr_attrs
= declarator
->u
.array
.attrs
;
5178 array_parm_static
= declarator
->u
.array
.static_p
;
5179 array_parm_vla_unspec_p
= declarator
->u
.array
.vla_unspec_p
;
5181 declarator
= declarator
->declarator
;
5183 /* Check for some types that there cannot be arrays of. */
5185 if (VOID_TYPE_P (type
))
5188 error_at (loc
, "declaration of %qE as array of voids", name
);
5190 error_at (loc
, "declaration of type name as array of voids");
5191 type
= error_mark_node
;
5194 if (TREE_CODE (type
) == FUNCTION_TYPE
)
5197 error_at (loc
, "declaration of %qE as array of functions",
5200 error_at (loc
, "declaration of type name as array of "
5202 type
= error_mark_node
;
5205 if (pedantic
&& !in_system_header
&& flexible_array_type_p (type
))
5206 pedwarn (loc
, OPT_pedantic
,
5207 "invalid use of structure with flexible array member");
5209 if (size
== error_mark_node
)
5210 type
= error_mark_node
;
5212 if (type
== error_mark_node
)
5215 /* If size was specified, set ITYPE to a range-type for
5216 that size. Otherwise, ITYPE remains null. finish_decl
5217 may figure it out from an initial value. */
5221 bool size_maybe_const
= true;
5222 bool size_int_const
= (TREE_CODE (size
) == INTEGER_CST
5223 && !TREE_OVERFLOW (size
));
5224 bool this_size_varies
= false;
5226 /* Strip NON_LVALUE_EXPRs since we aren't using as an
5228 STRIP_TYPE_NOPS (size
);
5230 if (!INTEGRAL_TYPE_P (TREE_TYPE (size
)))
5233 error_at (loc
, "size of array %qE has non-integer type",
5237 "size of unnamed array has non-integer type");
5238 size
= integer_one_node
;
5241 size
= c_fully_fold (size
, false, &size_maybe_const
);
5243 if (pedantic
&& size_maybe_const
&& integer_zerop (size
))
5246 pedwarn (loc
, OPT_pedantic
,
5247 "ISO C forbids zero-size array %qE", name
);
5249 pedwarn (loc
, OPT_pedantic
,
5250 "ISO C forbids zero-size array");
5253 if (TREE_CODE (size
) == INTEGER_CST
&& size_maybe_const
)
5255 constant_expression_warning (size
);
5256 if (tree_int_cst_sgn (size
) < 0)
5259 error_at (loc
, "size of array %qE is negative", name
);
5261 error_at (loc
, "size of unnamed array is negative");
5262 size
= integer_one_node
;
5264 /* Handle a size folded to an integer constant but
5265 not an integer constant expression. */
5266 if (!size_int_const
)
5268 /* If this is a file scope declaration of an
5269 ordinary identifier, this is invalid code;
5270 diagnosing it here and not subsequently
5271 treating the type as variable-length avoids
5272 more confusing diagnostics later. */
5273 if ((decl_context
== NORMAL
|| decl_context
== FIELD
)
5274 && current_scope
== file_scope
)
5275 pedwarn (input_location
, 0,
5276 "variably modified %qE at file scope",
5279 this_size_varies
= size_varies
= true;
5280 warn_variable_length_array (name
, size
);
5283 else if ((decl_context
== NORMAL
|| decl_context
== FIELD
)
5284 && current_scope
== file_scope
)
5286 error_at (loc
, "variably modified %qE at file scope", name
);
5287 size
= integer_one_node
;
5291 /* Make sure the array size remains visibly
5292 nonconstant even if it is (eg) a const variable
5293 with known value. */
5294 this_size_varies
= size_varies
= true;
5295 warn_variable_length_array (name
, size
);
5298 if (integer_zerop (size
) && !this_size_varies
)
5300 /* A zero-length array cannot be represented with
5301 an unsigned index type, which is what we'll
5302 get with build_index_type. Create an
5303 open-ended range instead. */
5304 itype
= build_range_type (sizetype
, size
, NULL_TREE
);
5308 /* Arrange for the SAVE_EXPR on the inside of the
5309 MINUS_EXPR, which allows the -1 to get folded
5310 with the +1 that happens when building TYPE_SIZE. */
5312 size
= c_variable_size (size
);
5313 if (this_size_varies
&& TREE_CODE (size
) == INTEGER_CST
)
5314 size
= build2 (COMPOUND_EXPR
, TREE_TYPE (size
),
5315 integer_zero_node
, size
);
5317 /* Compute the maximum valid index, that is, size
5318 - 1. Do the calculation in index_type, so that
5319 if it is a variable the computations will be
5320 done in the proper mode. */
5321 itype
= fold_build2_loc (loc
, MINUS_EXPR
, index_type
,
5322 convert (index_type
, size
),
5323 convert (index_type
,
5326 /* If that overflowed, the array is too big. ???
5327 While a size of INT_MAX+1 technically shouldn't
5328 cause an overflow (because we subtract 1), the
5329 overflow is recorded during the conversion to
5330 index_type, before the subtraction. Handling
5331 this case seems like an unnecessary
5333 if (TREE_CODE (itype
) == INTEGER_CST
5334 && TREE_OVERFLOW (itype
))
5337 error_at (loc
, "size of array %qE is too large",
5340 error_at (loc
, "size of unnamed array is too large");
5341 type
= error_mark_node
;
5345 itype
= build_index_type (itype
);
5347 if (this_size_varies
)
5350 *expr
= build2 (COMPOUND_EXPR
, TREE_TYPE (size
),
5354 *expr_const_operands
&= size_maybe_const
;
5357 else if (decl_context
== FIELD
)
5359 bool flexible_array_member
= false;
5360 if (array_parm_vla_unspec_p
)
5361 /* Field names can in fact have function prototype
5362 scope so [*] is disallowed here through making
5363 the field variably modified, not through being
5364 something other than a declaration with function
5369 const struct c_declarator
*t
= declarator
;
5370 while (t
->kind
== cdk_attrs
)
5372 flexible_array_member
= (t
->kind
== cdk_id
);
5374 if (flexible_array_member
5375 && pedantic
&& !flag_isoc99
&& !in_system_header
)
5376 pedwarn (loc
, OPT_pedantic
,
5377 "ISO C90 does not support flexible array members");
5379 /* ISO C99 Flexible array members are effectively
5380 identical to GCC's zero-length array extension. */
5381 if (flexible_array_member
|| array_parm_vla_unspec_p
)
5382 itype
= build_range_type (sizetype
, size_zero_node
,
5385 else if (decl_context
== PARM
)
5387 if (array_parm_vla_unspec_p
)
5389 itype
= build_range_type (sizetype
, size_zero_node
, NULL_TREE
);
5393 else if (decl_context
== TYPENAME
)
5395 if (array_parm_vla_unspec_p
)
5398 warning (0, "%<[*]%> not in a declaration");
5399 /* We use this to avoid messing up with incomplete
5400 array types of the same type, that would
5401 otherwise be modified below. */
5402 itype
= build_range_type (sizetype
, size_zero_node
,
5408 /* Complain about arrays of incomplete types. */
5409 if (!COMPLETE_TYPE_P (type
))
5411 error_at (loc
, "array type has incomplete element type");
5412 type
= error_mark_node
;
5415 /* When itype is NULL, a shared incomplete array type is
5416 returned for all array of a given type. Elsewhere we
5417 make sure we don't complete that type before copying
5418 it, but here we want to make sure we don't ever
5419 modify the shared type, so we gcc_assert (itype)
5422 addr_space_t as
= DECODE_QUAL_ADDR_SPACE (type_quals
);
5423 if (!ADDR_SPACE_GENERIC_P (as
) && as
!= TYPE_ADDR_SPACE (type
))
5424 type
= build_qualified_type (type
,
5425 ENCODE_QUAL_ADDR_SPACE (as
));
5427 type
= build_array_type (type
, itype
);
5430 if (type
!= error_mark_node
)
5434 /* It is ok to modify type here even if itype is
5435 NULL: if size_varies, we're in a
5436 multi-dimensional array and the inner type has
5437 variable size, so the enclosing shared array type
5439 if (size
&& TREE_CODE (size
) == INTEGER_CST
)
5441 = build_distinct_type_copy (TYPE_MAIN_VARIANT (type
));
5442 C_TYPE_VARIABLE_SIZE (type
) = 1;
5445 /* The GCC extension for zero-length arrays differs from
5446 ISO flexible array members in that sizeof yields
5448 if (size
&& integer_zerop (size
))
5451 type
= build_distinct_type_copy (TYPE_MAIN_VARIANT (type
));
5452 TYPE_SIZE (type
) = bitsize_zero_node
;
5453 TYPE_SIZE_UNIT (type
) = size_zero_node
;
5454 SET_TYPE_STRUCTURAL_EQUALITY (type
);
5456 if (array_parm_vla_unspec_p
)
5459 /* The type is complete. C99 6.7.5.2p4 */
5460 type
= build_distinct_type_copy (TYPE_MAIN_VARIANT (type
));
5461 TYPE_SIZE (type
) = bitsize_zero_node
;
5462 TYPE_SIZE_UNIT (type
) = size_zero_node
;
5463 SET_TYPE_STRUCTURAL_EQUALITY (type
);
5467 if (decl_context
!= PARM
5468 && (array_ptr_quals
!= TYPE_UNQUALIFIED
5469 || array_ptr_attrs
!= NULL_TREE
5470 || array_parm_static
))
5472 error_at (loc
, "static or type qualifiers in non-parameter array declarator");
5473 array_ptr_quals
= TYPE_UNQUALIFIED
;
5474 array_ptr_attrs
= NULL_TREE
;
5475 array_parm_static
= 0;
5481 /* Say it's a definition only for the declarator closest
5482 to the identifier, apart possibly from some
5484 bool really_funcdef
= false;
5488 const struct c_declarator
*t
= declarator
->declarator
;
5489 while (t
->kind
== cdk_attrs
)
5491 really_funcdef
= (t
->kind
== cdk_id
);
5494 /* Declaring a function type. Make sure we have a valid
5495 type for the function to return. */
5496 if (type
== error_mark_node
)
5499 size_varies
= false;
5501 /* Warn about some types functions can't return. */
5502 if (TREE_CODE (type
) == FUNCTION_TYPE
)
5505 error_at (loc
, "%qE declared as function returning a "
5508 error_at (loc
, "type name declared as function "
5509 "returning a function");
5510 type
= integer_type_node
;
5512 if (TREE_CODE (type
) == ARRAY_TYPE
)
5515 error_at (loc
, "%qE declared as function returning an array",
5518 error_at (loc
, "type name declared as function returning "
5520 type
= integer_type_node
;
5522 errmsg
= targetm
.invalid_return_type (type
);
5526 type
= integer_type_node
;
5529 /* Construct the function type and go to the next
5530 inner layer of declarator. */
5531 arg_info
= declarator
->u
.arg_info
;
5532 arg_types
= grokparms (arg_info
, really_funcdef
);
5534 put_pending_sizes (arg_info
->pending_sizes
);
5536 /* Type qualifiers before the return type of the function
5537 qualify the return type, not the function type. */
5540 /* Type qualifiers on a function return type are
5541 normally permitted by the standard but have no
5542 effect, so give a warning at -Wreturn-type.
5543 Qualifiers on a void return type are banned on
5544 function definitions in ISO C; GCC used to used
5545 them for noreturn functions. */
5546 if (VOID_TYPE_P (type
) && really_funcdef
)
5548 "function definition has qualified void return type");
5550 warning_at (loc
, OPT_Wignored_qualifiers
,
5551 "type qualifiers ignored on function return type");
5553 type
= c_build_qualified_type (type
, type_quals
);
5555 type_quals
= TYPE_UNQUALIFIED
;
5557 type
= build_function_type (type
, arg_types
);
5558 declarator
= declarator
->declarator
;
5560 /* Set the TYPE_CONTEXTs for each tagged type which is local to
5561 the formal parameter list of this FUNCTION_TYPE to point to
5562 the FUNCTION_TYPE node itself. */
5567 FOR_EACH_VEC_ELT_REVERSE (c_arg_tag
, arg_info
->tags
, ix
, tag
)
5568 TYPE_CONTEXT (tag
->type
) = type
;
5574 /* Merge any constancy or volatility into the target type
5577 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
5579 pedwarn (loc
, OPT_pedantic
,
5580 "ISO C forbids qualified function types");
5582 type
= c_build_qualified_type (type
, type_quals
);
5583 size_varies
= false;
5585 /* When the pointed-to type involves components of variable size,
5586 care must be taken to ensure that the size evaluation code is
5587 emitted early enough to dominate all the possible later uses
5588 and late enough for the variables on which it depends to have
5591 This is expected to happen automatically when the pointed-to
5592 type has a name/declaration of it's own, but special attention
5593 is required if the type is anonymous.
5595 We handle the NORMAL and FIELD contexts here by attaching an
5596 artificial TYPE_DECL to such pointed-to type. This forces the
5597 sizes evaluation at a safe point and ensures it is not deferred
5598 until e.g. within a deeper conditional context.
5600 We expect nothing to be needed here for PARM or TYPENAME.
5601 Pushing a TYPE_DECL at this point for TYPENAME would actually
5602 be incorrect, as we might be in the middle of an expression
5603 with side effects on the pointed-to type size "arguments" prior
5604 to the pointer declaration point and the fake TYPE_DECL in the
5605 enclosing context would force the size evaluation prior to the
5608 if (!TYPE_NAME (type
)
5609 && (decl_context
== NORMAL
|| decl_context
== FIELD
)
5610 && variably_modified_type_p (type
, NULL_TREE
))
5612 tree decl
= build_decl (loc
, TYPE_DECL
, NULL_TREE
, type
);
5613 DECL_ARTIFICIAL (decl
) = 1;
5615 finish_decl (decl
, loc
, NULL_TREE
, NULL_TREE
, NULL_TREE
);
5616 TYPE_NAME (type
) = decl
;
5619 type
= build_pointer_type (type
);
5621 /* Process type qualifiers (such as const or volatile)
5622 that were given inside the `*'. */
5623 type_quals
= declarator
->u
.pointer_quals
;
5625 declarator
= declarator
->declarator
;
5632 *decl_attrs
= chainon (returned_attrs
, *decl_attrs
);
5634 /* Now TYPE has the actual type, apart from any qualifiers in
5637 /* Warn about address space used for things other than static memory or
5639 address_space
= DECODE_QUAL_ADDR_SPACE (type_quals
);
5640 if (!ADDR_SPACE_GENERIC_P (address_space
))
5642 if (decl_context
== NORMAL
)
5644 switch (storage_class
)
5647 error ("%qs combined with %<auto%> qualifier for %qE",
5648 c_addr_space_name (address_space
), name
);
5651 error ("%qs combined with %<register%> qualifier for %qE",
5652 c_addr_space_name (address_space
), name
);
5655 if (current_function_scope
)
5657 error ("%qs specified for auto variable %qE",
5658 c_addr_space_name (address_space
), name
);
5670 else if (decl_context
== PARM
&& TREE_CODE (type
) != ARRAY_TYPE
)
5673 error ("%qs specified for parameter %qE",
5674 c_addr_space_name (address_space
), name
);
5676 error ("%qs specified for unnamed parameter",
5677 c_addr_space_name (address_space
));
5679 else if (decl_context
== FIELD
)
5682 error ("%qs specified for structure field %qE",
5683 c_addr_space_name (address_space
), name
);
5685 error ("%qs specified for structure field",
5686 c_addr_space_name (address_space
));
5690 /* Check the type and width of a bit-field. */
5692 check_bitfield_type_and_width (&type
, width
, name
);
5694 /* Did array size calculations overflow? */
5696 if (TREE_CODE (type
) == ARRAY_TYPE
5697 && COMPLETE_TYPE_P (type
)
5698 && TREE_CODE (TYPE_SIZE_UNIT (type
)) == INTEGER_CST
5699 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type
)))
5702 error_at (loc
, "size of array %qE is too large", name
);
5704 error_at (loc
, "size of unnamed array is too large");
5705 /* If we proceed with the array type as it is, we'll eventually
5706 crash in tree_low_cst(). */
5707 type
= error_mark_node
;
5710 /* If this is declaring a typedef name, return a TYPE_DECL. */
5712 if (storage_class
== csc_typedef
)
5715 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
5717 pedwarn (loc
, OPT_pedantic
,
5718 "ISO C forbids qualified function types");
5720 type
= c_build_qualified_type (type
, type_quals
);
5721 decl
= build_decl (declarator
->id_loc
,
5722 TYPE_DECL
, declarator
->u
.id
, type
);
5723 if (declspecs
->explicit_signed_p
)
5724 C_TYPEDEF_EXPLICITLY_SIGNED (decl
) = 1;
5725 if (declspecs
->inline_p
)
5726 pedwarn (loc
, 0,"typedef %q+D declared %<inline%>", decl
);
5728 if (warn_cxx_compat
&& declarator
->u
.id
!= NULL_TREE
)
5730 struct c_binding
*b
= I_TAG_BINDING (declarator
->u
.id
);
5733 && b
->decl
!= NULL_TREE
5734 && (B_IN_CURRENT_SCOPE (b
)
5735 || (current_scope
== file_scope
&& B_IN_EXTERNAL_SCOPE (b
)))
5736 && TYPE_MAIN_VARIANT (b
->decl
) != TYPE_MAIN_VARIANT (type
))
5738 warning_at (declarator
->id_loc
, OPT_Wc___compat
,
5739 ("using %qD as both a typedef and a tag is "
5742 if (b
->locus
!= UNKNOWN_LOCATION
)
5743 inform (b
->locus
, "originally defined here");
5750 /* If this is a type name (such as, in a cast or sizeof),
5751 compute the type and return it now. */
5753 if (decl_context
== TYPENAME
)
5755 /* Note that the grammar rejects storage classes in typenames
5757 gcc_assert (storage_class
== csc_none
&& !threadp
5758 && !declspecs
->inline_p
);
5759 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
5761 pedwarn (loc
, OPT_pedantic
,
5762 "ISO C forbids const or volatile function types");
5764 type
= c_build_qualified_type (type
, type_quals
);
5768 if (pedantic
&& decl_context
== FIELD
5769 && variably_modified_type_p (type
, NULL_TREE
))
5772 pedwarn (loc
, OPT_pedantic
, "a member of a structure or union cannot "
5773 "have a variably modified type");
5776 /* Aside from typedefs and type names (handle above),
5777 `void' at top level (not within pointer)
5778 is allowed only in public variables.
5779 We don't complain about parms either, but that is because
5780 a better error message can be made later. */
5782 if (VOID_TYPE_P (type
) && decl_context
!= PARM
5783 && !((decl_context
!= FIELD
&& TREE_CODE (type
) != FUNCTION_TYPE
)
5784 && (storage_class
== csc_extern
5785 || (current_scope
== file_scope
5786 && !(storage_class
== csc_static
5787 || storage_class
== csc_register
)))))
5789 error_at (loc
, "variable or field %qE declared void", name
);
5790 type
= integer_type_node
;
5793 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
5794 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
5799 if (decl_context
== PARM
)
5803 /* A parameter declared as an array of T is really a pointer to T.
5804 One declared as a function is really a pointer to a function. */
5806 if (TREE_CODE (type
) == ARRAY_TYPE
)
5808 /* Transfer const-ness of array into that of type pointed to. */
5809 type
= TREE_TYPE (type
);
5811 type
= c_build_qualified_type (type
, type_quals
);
5812 type
= build_pointer_type (type
);
5813 type_quals
= array_ptr_quals
;
5815 type
= c_build_qualified_type (type
, type_quals
);
5817 /* We don't yet implement attributes in this context. */
5818 if (array_ptr_attrs
!= NULL_TREE
)
5819 warning_at (loc
, OPT_Wattributes
,
5820 "attributes in parameter array declarator ignored");
5822 size_varies
= false;
5824 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
5827 pedwarn (loc
, OPT_pedantic
,
5828 "ISO C forbids qualified function types");
5830 type
= c_build_qualified_type (type
, type_quals
);
5831 type
= build_pointer_type (type
);
5832 type_quals
= TYPE_UNQUALIFIED
;
5834 else if (type_quals
)
5835 type
= c_build_qualified_type (type
, type_quals
);
5837 decl
= build_decl (declarator
->id_loc
,
5838 PARM_DECL
, declarator
->u
.id
, type
);
5840 C_DECL_VARIABLE_SIZE (decl
) = 1;
5842 /* Compute the type actually passed in the parmlist,
5843 for the case where there is no prototype.
5844 (For example, shorts and chars are passed as ints.)
5845 When there is a prototype, this is overridden later. */
5847 if (type
== error_mark_node
)
5848 promoted_type
= type
;
5850 promoted_type
= c_type_promotes_to (type
);
5852 DECL_ARG_TYPE (decl
) = promoted_type
;
5853 if (declspecs
->inline_p
)
5854 pedwarn (loc
, 0, "parameter %q+D declared %<inline%>", decl
);
5856 else if (decl_context
== FIELD
)
5858 /* Note that the grammar rejects storage classes in typenames
5860 gcc_assert (storage_class
== csc_none
&& !threadp
5861 && !declspecs
->inline_p
);
5863 /* Structure field. It may not be a function. */
5865 if (TREE_CODE (type
) == FUNCTION_TYPE
)
5867 error_at (loc
, "field %qE declared as a function", name
);
5868 type
= build_pointer_type (type
);
5870 else if (TREE_CODE (type
) != ERROR_MARK
5871 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type
))
5874 error_at (loc
, "field %qE has incomplete type", name
);
5876 error_at (loc
, "unnamed field has incomplete type");
5877 type
= error_mark_node
;
5879 type
= c_build_qualified_type (type
, type_quals
);
5880 decl
= build_decl (declarator
->id_loc
,
5881 FIELD_DECL
, declarator
->u
.id
, type
);
5882 DECL_NONADDRESSABLE_P (decl
) = bitfield
;
5883 if (bitfield
&& !declarator
->u
.id
)
5884 TREE_NO_WARNING (decl
) = 1;
5887 C_DECL_VARIABLE_SIZE (decl
) = 1;
5889 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
5891 if (storage_class
== csc_register
|| threadp
)
5893 error_at (loc
, "invalid storage class for function %qE", name
);
5895 else if (current_scope
!= file_scope
)
5897 /* Function declaration not at file scope. Storage
5898 classes other than `extern' are not allowed, C99
5899 6.7.1p5, and `extern' makes no difference. However,
5900 GCC allows 'auto', perhaps with 'inline', to support
5901 nested functions. */
5902 if (storage_class
== csc_auto
)
5903 pedwarn (loc
, OPT_pedantic
,
5904 "invalid storage class for function %qE", name
);
5905 else if (storage_class
== csc_static
)
5907 error_at (loc
, "invalid storage class for function %qE", name
);
5909 storage_class
= declspecs
->storage_class
= csc_none
;
5915 decl
= build_decl (declarator
->id_loc
,
5916 FUNCTION_DECL
, declarator
->u
.id
, type
);
5917 decl
= build_decl_attribute_variant (decl
, decl_attr
);
5919 if (pedantic
&& type_quals
&& !DECL_IN_SYSTEM_HEADER (decl
))
5920 pedwarn (loc
, OPT_pedantic
,
5921 "ISO C forbids qualified function types");
5923 /* Every function declaration is an external reference
5924 (DECL_EXTERNAL) except for those which are not at file
5925 scope and are explicitly declared "auto". This is
5926 forbidden by standard C (C99 6.7.1p5) and is interpreted by
5927 GCC to signify a forward declaration of a nested function. */
5928 if (storage_class
== csc_auto
&& current_scope
!= file_scope
)
5929 DECL_EXTERNAL (decl
) = 0;
5930 /* In C99, a function which is declared 'inline' with 'extern'
5931 is not an external reference (which is confusing). It
5932 means that the later definition of the function must be output
5933 in this file, C99 6.7.4p6. In GNU C89, a function declared
5934 'extern inline' is an external reference. */
5935 else if (declspecs
->inline_p
&& storage_class
!= csc_static
)
5936 DECL_EXTERNAL (decl
) = ((storage_class
== csc_extern
)
5937 == flag_gnu89_inline
);
5939 DECL_EXTERNAL (decl
) = !initialized
;
5941 /* Record absence of global scope for `static' or `auto'. */
5943 = !(storage_class
== csc_static
|| storage_class
== csc_auto
);
5945 /* For a function definition, record the argument information
5946 block where store_parm_decls will look for it. */
5948 current_function_arg_info
= arg_info
;
5950 if (declspecs
->default_int_p
)
5951 C_FUNCTION_IMPLICIT_INT (decl
) = 1;
5953 /* Record presence of `inline', if it is reasonable. */
5954 if (flag_hosted
&& MAIN_NAME_P (declarator
->u
.id
))
5956 if (declspecs
->inline_p
)
5957 pedwarn (loc
, 0, "cannot inline function %<main%>");
5959 else if (declspecs
->inline_p
)
5960 /* Record that the function is declared `inline'. */
5961 DECL_DECLARED_INLINE_P (decl
) = 1;
5965 /* It's a variable. */
5966 /* An uninitialized decl with `extern' is a reference. */
5967 int extern_ref
= !initialized
&& storage_class
== csc_extern
;
5969 type
= c_build_qualified_type (type
, type_quals
);
5971 /* C99 6.2.2p7: It is invalid (compile-time undefined
5972 behavior) to create an 'extern' declaration for a
5973 variable if there is a global declaration that is
5974 'static' and the global declaration is not visible.
5975 (If the static declaration _is_ currently visible,
5976 the 'extern' declaration is taken to refer to that decl.) */
5977 if (extern_ref
&& current_scope
!= file_scope
)
5979 tree global_decl
= identifier_global_value (declarator
->u
.id
);
5980 tree visible_decl
= lookup_name (declarator
->u
.id
);
5983 && global_decl
!= visible_decl
5984 && TREE_CODE (global_decl
) == VAR_DECL
5985 && !TREE_PUBLIC (global_decl
))
5986 error_at (loc
, "variable previously declared %<static%> "
5987 "redeclared %<extern%>");
5990 decl
= build_decl (declarator
->id_loc
,
5991 VAR_DECL
, declarator
->u
.id
, type
);
5993 C_DECL_VARIABLE_SIZE (decl
) = 1;
5995 if (declspecs
->inline_p
)
5996 pedwarn (loc
, 0, "variable %q+D declared %<inline%>", decl
);
5998 /* At file scope, an initialized extern declaration may follow
5999 a static declaration. In that case, DECL_EXTERNAL will be
6000 reset later in start_decl. */
6001 DECL_EXTERNAL (decl
) = (storage_class
== csc_extern
);
6003 /* At file scope, the presence of a `static' or `register' storage
6004 class specifier, or the absence of all storage class specifiers
6005 makes this declaration a definition (perhaps tentative). Also,
6006 the absence of `static' makes it public. */
6007 if (current_scope
== file_scope
)
6009 TREE_PUBLIC (decl
) = storage_class
!= csc_static
;
6010 TREE_STATIC (decl
) = !extern_ref
;
6012 /* Not at file scope, only `static' makes a static definition. */
6015 TREE_STATIC (decl
) = (storage_class
== csc_static
);
6016 TREE_PUBLIC (decl
) = extern_ref
;
6020 DECL_TLS_MODEL (decl
) = decl_default_tls_model (decl
);
6023 if ((storage_class
== csc_extern
6024 || (storage_class
== csc_none
6025 && TREE_CODE (type
) == FUNCTION_TYPE
6027 && variably_modified_type_p (type
, NULL_TREE
))
6030 if (TREE_CODE (type
) == FUNCTION_TYPE
)
6031 error_at (loc
, "non-nested function with variably modified type");
6033 error_at (loc
, "object with variably modified type must have "
6037 /* Record `register' declaration for warnings on &
6038 and in case doing stupid register allocation. */
6040 if (storage_class
== csc_register
)
6042 C_DECL_REGISTER (decl
) = 1;
6043 DECL_REGISTER (decl
) = 1;
6046 /* Record constancy and volatility. */
6047 c_apply_type_quals_to_decl (type_quals
, decl
);
6049 /* If a type has volatile components, it should be stored in memory.
6050 Otherwise, the fact that those components are volatile
6051 will be ignored, and would even crash the compiler.
6052 Of course, this only makes sense on VAR,PARM, and RESULT decl's. */
6053 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl
))
6054 && (TREE_CODE (decl
) == VAR_DECL
|| TREE_CODE (decl
) == PARM_DECL
6055 || TREE_CODE (decl
) == RESULT_DECL
))
6057 /* It is not an error for a structure with volatile fields to
6058 be declared register, but reset DECL_REGISTER since it
6059 cannot actually go in a register. */
6060 int was_reg
= C_DECL_REGISTER (decl
);
6061 C_DECL_REGISTER (decl
) = 0;
6062 DECL_REGISTER (decl
) = 0;
6063 c_mark_addressable (decl
);
6064 C_DECL_REGISTER (decl
) = was_reg
;
6067 /* This is the earliest point at which we might know the assembler
6068 name of a variable. Thus, if it's known before this, die horribly. */
6069 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl
));
6072 && TREE_CODE (decl
) == VAR_DECL
6073 && TREE_PUBLIC (decl
)
6074 && TREE_STATIC (decl
)
6075 && (TREE_CODE (TREE_TYPE (decl
)) == RECORD_TYPE
6076 || TREE_CODE (TREE_TYPE (decl
)) == UNION_TYPE
6077 || TREE_CODE (TREE_TYPE (decl
)) == ENUMERAL_TYPE
)
6078 && TYPE_NAME (TREE_TYPE (decl
)) == NULL_TREE
)
6079 warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wc___compat
,
6080 ("non-local variable %qD with anonymous type is "
6081 "questionable in C++"),
6088 /* Decode the parameter-list info for a function type or function definition.
6089 The argument is the value returned by `get_parm_info' (or made in c-parse.c
6090 if there is an identifier list instead of a parameter decl list).
6091 These two functions are separate because when a function returns
6092 or receives functions then each is called multiple times but the order
6093 of calls is different. The last call to `grokparms' is always the one
6094 that contains the formal parameter names of a function definition.
6096 Return a list of arg types to use in the FUNCTION_TYPE for this function.
6098 FUNCDEF_FLAG is true for a function definition, false for
6099 a mere declaration. A nonempty identifier-list gets an error message
6100 when FUNCDEF_FLAG is false. */
6103 grokparms (struct c_arg_info
*arg_info
, bool funcdef_flag
)
6105 tree arg_types
= arg_info
->types
;
6107 if (funcdef_flag
&& arg_info
->had_vla_unspec
)
6109 /* A function definition isn't function prototype scope C99 6.2.1p4. */
6111 error ("%<[*]%> not allowed in other than function prototype scope");
6114 if (arg_types
== 0 && !funcdef_flag
&& !in_system_header
)
6115 warning (OPT_Wstrict_prototypes
,
6116 "function declaration isn%'t a prototype");
6118 if (arg_types
== error_mark_node
)
6119 return 0; /* don't set TYPE_ARG_TYPES in this case */
6121 else if (arg_types
&& TREE_CODE (TREE_VALUE (arg_types
)) == IDENTIFIER_NODE
)
6124 pedwarn (input_location
, 0, "parameter names (without types) in function declaration");
6126 arg_info
->parms
= arg_info
->types
;
6127 arg_info
->types
= 0;
6132 tree parm
, type
, typelt
;
6133 unsigned int parmno
;
6136 /* If there is a parameter of incomplete type in a definition,
6137 this is an error. In a declaration this is valid, and a
6138 struct or union type may be completed later, before any calls
6139 or definition of the function. In the case where the tag was
6140 first declared within the parameter list, a warning has
6141 already been given. If a parameter has void type, then
6142 however the function cannot be defined or called, so
6145 for (parm
= arg_info
->parms
, typelt
= arg_types
, parmno
= 1;
6147 parm
= DECL_CHAIN (parm
), typelt
= TREE_CHAIN (typelt
), parmno
++)
6149 type
= TREE_VALUE (typelt
);
6150 if (type
== error_mark_node
)
6153 if (!COMPLETE_TYPE_P (type
))
6157 if (DECL_NAME (parm
))
6158 error_at (input_location
,
6159 "parameter %u (%q+D) has incomplete type",
6162 error_at (DECL_SOURCE_LOCATION (parm
),
6163 "parameter %u has incomplete type",
6166 TREE_VALUE (typelt
) = error_mark_node
;
6167 TREE_TYPE (parm
) = error_mark_node
;
6168 arg_types
= NULL_TREE
;
6170 else if (VOID_TYPE_P (type
))
6172 if (DECL_NAME (parm
))
6173 warning_at (input_location
, 0,
6174 "parameter %u (%q+D) has void type",
6177 warning_at (DECL_SOURCE_LOCATION (parm
), 0,
6178 "parameter %u has void type",
6183 errmsg
= targetm
.invalid_parameter_type (type
);
6187 TREE_VALUE (typelt
) = error_mark_node
;
6188 TREE_TYPE (parm
) = error_mark_node
;
6189 arg_types
= NULL_TREE
;
6192 if (DECL_NAME (parm
) && TREE_USED (parm
))
6193 warn_if_shadowing (parm
);
6199 /* Allocate and initialize a c_arg_info structure from the parser's
6203 build_arg_info (void)
6205 struct c_arg_info
*ret
= XOBNEW (&parser_obstack
, struct c_arg_info
);
6206 ret
->parms
= NULL_TREE
;
6208 ret
->types
= NULL_TREE
;
6209 ret
->others
= NULL_TREE
;
6210 ret
->pending_sizes
= NULL
;
6211 ret
->had_vla_unspec
= 0;
6215 /* Take apart the current scope and return a c_arg_info structure with
6216 info on a parameter list just parsed.
6218 This structure is later fed to 'grokparms' and 'store_parm_decls'.
6220 ELLIPSIS being true means the argument list ended in '...' so don't
6221 append a sentinel (void_list_node) to the end of the type-list. */
6224 get_parm_info (bool ellipsis
)
6226 struct c_binding
*b
= current_scope
->bindings
;
6227 struct c_arg_info
*arg_info
= build_arg_info ();
6230 VEC(c_arg_tag
,gc
) *tags
= NULL
;
6234 static bool explained_incomplete_types
= false;
6235 bool gave_void_only_once_err
= false;
6237 arg_info
->had_vla_unspec
= current_scope
->had_vla_unspec
;
6239 /* The bindings in this scope must not get put into a block.
6240 We will take care of deleting the binding nodes. */
6241 current_scope
->bindings
= 0;
6243 /* This function is only called if there was *something* on the
6247 /* A parameter list consisting solely of 'void' indicates that the
6248 function takes no arguments. But if the 'void' is qualified
6249 (by 'const' or 'volatile'), or has a storage class specifier
6250 ('register'), then the behavior is undefined; issue an error.
6251 Typedefs for 'void' are OK (see DR#157). */
6252 if (b
->prev
== 0 /* one binding */
6253 && TREE_CODE (b
->decl
) == PARM_DECL
/* which is a parameter */
6254 && !DECL_NAME (b
->decl
) /* anonymous */
6255 && VOID_TYPE_P (TREE_TYPE (b
->decl
))) /* of void type */
6257 if (TREE_THIS_VOLATILE (b
->decl
)
6258 || TREE_READONLY (b
->decl
)
6259 || C_DECL_REGISTER (b
->decl
))
6260 error ("%<void%> as only parameter may not be qualified");
6262 /* There cannot be an ellipsis. */
6264 error ("%<void%> must be the only parameter");
6266 arg_info
->types
= void_list_node
;
6271 types
= void_list_node
;
6273 /* Break up the bindings list into parms, tags, types, and others;
6274 apply sanity checks; purge the name-to-decl bindings. */
6277 tree decl
= b
->decl
;
6278 tree type
= TREE_TYPE (decl
);
6280 const char *keyword
;
6282 switch (TREE_CODE (decl
))
6287 gcc_assert (I_SYMBOL_BINDING (b
->id
) == b
);
6288 I_SYMBOL_BINDING (b
->id
) = b
->shadowed
;
6291 /* Check for forward decls that never got their actual decl. */
6292 if (TREE_ASM_WRITTEN (decl
))
6293 error ("parameter %q+D has just a forward declaration", decl
);
6294 /* Check for (..., void, ...) and issue an error. */
6295 else if (VOID_TYPE_P (type
) && !DECL_NAME (decl
))
6297 if (!gave_void_only_once_err
)
6299 error ("%<void%> must be the only parameter");
6300 gave_void_only_once_err
= true;
6305 /* Valid parameter, add it to the list. */
6306 DECL_CHAIN (decl
) = parms
;
6309 /* Since there is a prototype, args are passed in their
6310 declared types. The back end may override this later. */
6311 DECL_ARG_TYPE (decl
) = type
;
6312 types
= tree_cons (0, type
, types
);
6316 case ENUMERAL_TYPE
: keyword
= "enum"; goto tag
;
6317 case UNION_TYPE
: keyword
= "union"; goto tag
;
6318 case RECORD_TYPE
: keyword
= "struct"; goto tag
;
6320 /* Types may not have tag-names, in which case the type
6321 appears in the bindings list with b->id NULL. */
6324 gcc_assert (I_TAG_BINDING (b
->id
) == b
);
6325 I_TAG_BINDING (b
->id
) = b
->shadowed
;
6328 /* Warn about any struct, union or enum tags defined in a
6329 parameter list. The scope of such types is limited to
6330 the parameter list, which is rarely if ever desirable
6331 (it's impossible to call such a function with type-
6332 correct arguments). An anonymous union parm type is
6333 meaningful as a GNU extension, so don't warn for that. */
6334 if (TREE_CODE (decl
) != UNION_TYPE
|| b
->id
!= 0)
6337 /* The %s will be one of 'struct', 'union', or 'enum'. */
6338 warning (0, "%<%s %E%> declared inside parameter list",
6341 /* The %s will be one of 'struct', 'union', or 'enum'. */
6342 warning (0, "anonymous %s declared inside parameter list",
6345 if (!explained_incomplete_types
)
6347 warning (0, "its scope is only this definition or declaration,"
6348 " which is probably not what you want");
6349 explained_incomplete_types
= true;
6353 tag
= VEC_safe_push (c_arg_tag
, gc
, tags
, NULL
);
6361 /* CONST_DECLs appear here when we have an embedded enum,
6362 and TYPE_DECLs appear here when we have an embedded struct
6363 or union. No warnings for this - we already warned about the
6364 type itself. FUNCTION_DECLs appear when there is an implicit
6365 function declaration in the parameter list. */
6367 /* When we reinsert this decl in the function body, we need
6368 to reconstruct whether it was marked as nested. */
6369 gcc_assert (TREE_CODE (decl
) == FUNCTION_DECL
6372 DECL_CHAIN (decl
) = others
;
6377 /* error_mark_node appears here when we have an undeclared
6378 variable. Just throw it away. */
6381 gcc_assert (I_SYMBOL_BINDING (b
->id
) == b
);
6382 I_SYMBOL_BINDING (b
->id
) = b
->shadowed
;
6386 /* Other things that might be encountered. */
6393 b
= free_binding_and_advance (b
);
6396 arg_info
->parms
= parms
;
6397 arg_info
->tags
= tags
;
6398 arg_info
->types
= types
;
6399 arg_info
->others
= others
;
6400 arg_info
->pending_sizes
= get_pending_sizes ();
6404 /* Get the struct, enum or union (CODE says which) with tag NAME.
6405 Define the tag as a forward-reference with location LOC if it is
6406 not defined. Return a c_typespec structure for the type
6410 parser_xref_tag (location_t loc
, enum tree_code code
, tree name
)
6412 struct c_typespec ret
;
6416 ret
.expr
= NULL_TREE
;
6417 ret
.expr_const_operands
= true;
6419 /* If a cross reference is requested, look up the type
6420 already defined for this tag and return it. */
6422 ref
= lookup_tag (code
, name
, 0, &refloc
);
6423 /* If this is the right type of tag, return what we found.
6424 (This reference will be shadowed by shadow_tag later if appropriate.)
6425 If this is the wrong type of tag, do not return it. If it was the
6426 wrong type in the same scope, we will have had an error
6427 message already; if in a different scope and declaring
6428 a name, pending_xref_error will give an error message; but if in a
6429 different scope and not declaring a name, this tag should
6430 shadow the previous declaration of a different type of tag, and
6431 this would not work properly if we return the reference found.
6432 (For example, with "struct foo" in an outer scope, "union foo;"
6433 must shadow that tag with a new one of union type.) */
6434 ret
.kind
= (ref
? ctsk_tagref
: ctsk_tagfirstref
);
6435 if (ref
&& TREE_CODE (ref
) == code
)
6437 if (C_TYPE_DEFINED_IN_STRUCT (ref
)
6438 && loc
!= UNKNOWN_LOCATION
6444 warning_at (loc
, OPT_Wc___compat
,
6445 ("enum type defined in struct or union "
6446 "is not visible in C++"));
6447 inform (refloc
, "enum type defined here");
6450 warning_at (loc
, OPT_Wc___compat
,
6451 ("struct defined in struct or union "
6452 "is not visible in C++"));
6453 inform (refloc
, "struct defined here");
6456 warning_at (loc
, OPT_Wc___compat
,
6457 ("union defined in struct or union "
6458 "is not visible in C++"));
6459 inform (refloc
, "union defined here");
6470 /* If no such tag is yet defined, create a forward-reference node
6471 and record it as the "definition".
6472 When a real declaration of this type is found,
6473 the forward-reference will be altered into a real type. */
6475 ref
= make_node (code
);
6476 if (code
== ENUMERAL_TYPE
)
6478 /* Give the type a default layout like unsigned int
6479 to avoid crashing if it does not get defined. */
6480 SET_TYPE_MODE (ref
, TYPE_MODE (unsigned_type_node
));
6481 TYPE_ALIGN (ref
) = TYPE_ALIGN (unsigned_type_node
);
6482 TYPE_USER_ALIGN (ref
) = 0;
6483 TYPE_UNSIGNED (ref
) = 1;
6484 TYPE_PRECISION (ref
) = TYPE_PRECISION (unsigned_type_node
);
6485 TYPE_MIN_VALUE (ref
) = TYPE_MIN_VALUE (unsigned_type_node
);
6486 TYPE_MAX_VALUE (ref
) = TYPE_MAX_VALUE (unsigned_type_node
);
6489 pushtag (loc
, name
, ref
);
6495 /* Get the struct, enum or union (CODE says which) with tag NAME.
6496 Define the tag as a forward-reference if it is not defined.
6497 Return a tree for the type. */
6500 xref_tag (enum tree_code code
, tree name
)
6502 return parser_xref_tag (input_location
, code
, name
).spec
;
6505 /* Make sure that the tag NAME is defined *in the current scope*
6506 at least as a forward reference.
6507 LOC is the location of the struct's definition.
6508 CODE says which kind of tag NAME ought to be.
6510 This stores the current value of the file static STRUCT_PARSE_INFO
6511 in *ENCLOSING_STRUCT_PARSE_INFO, and points STRUCT_PARSE_INFO at a
6512 new c_struct_parse_info structure. The old value of
6513 STRUCT_PARSE_INFO is restored in finish_struct. */
6516 start_struct (location_t loc
, enum tree_code code
, tree name
,
6517 struct c_struct_parse_info
**enclosing_struct_parse_info
)
6519 /* If there is already a tag defined at this scope
6520 (as a forward reference), just return it. */
6522 tree ref
= NULL_TREE
;
6523 location_t refloc
= UNKNOWN_LOCATION
;
6525 if (name
!= NULL_TREE
)
6526 ref
= lookup_tag (code
, name
, 1, &refloc
);
6527 if (ref
&& TREE_CODE (ref
) == code
)
6529 if (TYPE_SIZE (ref
))
6531 if (code
== UNION_TYPE
)
6532 error_at (loc
, "redefinition of %<union %E%>", name
);
6534 error_at (loc
, "redefinition of %<struct %E%>", name
);
6535 if (refloc
!= UNKNOWN_LOCATION
)
6536 inform (refloc
, "originally defined here");
6537 /* Don't create structures using a name already in use. */
6540 else if (C_TYPE_BEING_DEFINED (ref
))
6542 if (code
== UNION_TYPE
)
6543 error_at (loc
, "nested redefinition of %<union %E%>", name
);
6545 error_at (loc
, "nested redefinition of %<struct %E%>", name
);
6546 /* Don't bother to report "originally defined here" for a
6547 nested redefinition; the original definition should be
6549 /* Don't create structures that contain themselves. */
6554 /* Otherwise create a forward-reference just so the tag is in scope. */
6556 if (ref
== NULL_TREE
|| TREE_CODE (ref
) != code
)
6558 ref
= make_node (code
);
6559 pushtag (loc
, name
, ref
);
6562 C_TYPE_BEING_DEFINED (ref
) = 1;
6563 TYPE_PACKED (ref
) = flag_pack_struct
;
6565 *enclosing_struct_parse_info
= struct_parse_info
;
6566 struct_parse_info
= XNEW (struct c_struct_parse_info
);
6567 struct_parse_info
->struct_types
= VEC_alloc (tree
, heap
, 0);
6568 struct_parse_info
->fields
= VEC_alloc (c_binding_ptr
, heap
, 0);
6569 struct_parse_info
->typedefs_seen
= VEC_alloc (tree
, heap
, 0);
6571 /* FIXME: This will issue a warning for a use of a type defined
6572 within a statement expr used within sizeof, et. al. This is not
6573 terribly serious as C++ doesn't permit statement exprs within
6575 if (warn_cxx_compat
&& (in_sizeof
|| in_typeof
|| in_alignof
))
6576 warning_at (loc
, OPT_Wc___compat
,
6577 "defining type in %qs expression is invalid in C++",
6580 : (in_typeof
? "typeof" : "alignof")));
6585 /* Process the specs, declarator and width (NULL if omitted)
6586 of a structure component, returning a FIELD_DECL node.
6587 WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node.
6588 DECL_ATTRS is as for grokdeclarator.
6590 LOC is the location of the structure component.
6592 This is done during the parsing of the struct declaration.
6593 The FIELD_DECL nodes are chained together and the lot of them
6594 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
6597 grokfield (location_t loc
,
6598 struct c_declarator
*declarator
, struct c_declspecs
*declspecs
,
6599 tree width
, tree
*decl_attrs
)
6603 if (declarator
->kind
== cdk_id
&& declarator
->u
.id
== NULL_TREE
6604 && width
== NULL_TREE
)
6606 /* This is an unnamed decl.
6608 If we have something of the form "union { list } ;" then this
6609 is the anonymous union extension. Similarly for struct.
6611 If this is something of the form "struct foo;", then
6612 If MS extensions are enabled, this is handled as an
6614 Otherwise this is a forward declaration of a structure tag.
6616 If this is something of the form "foo;" and foo is a TYPE_DECL, then
6617 If foo names a structure or union without a tag, then this
6618 is an anonymous struct (this is permitted by C1X).
6619 If MS extensions are enabled and foo names a structure, then
6620 again this is an anonymous struct.
6621 Otherwise this is an error.
6623 Oh what a horrid tangled web we weave. I wonder if MS consciously
6624 took this from Plan 9 or if it was an accident of implementation
6625 that took root before someone noticed the bug... */
6627 tree type
= declspecs
->type
;
6628 bool type_ok
= (TREE_CODE (type
) == RECORD_TYPE
6629 || TREE_CODE (type
) == UNION_TYPE
);
6634 if (flag_ms_extensions
)
6636 else if (TYPE_NAME (TYPE_MAIN_VARIANT (type
)) == NULL
)
6643 pedwarn (loc
, 0, "declaration does not declare anything");
6649 pedwarn (loc
, OPT_pedantic
,
6650 "ISO C99 doesn%'t support unnamed structs/unions");
6652 pedwarn (loc
, OPT_pedantic
,
6653 "ISO C90 doesn%'t support unnamed structs/unions");
6657 value
= grokdeclarator (declarator
, declspecs
, FIELD
, false,
6658 width
? &width
: NULL
, decl_attrs
, NULL
, NULL
,
6661 finish_decl (value
, loc
, NULL_TREE
, NULL_TREE
, NULL_TREE
);
6662 DECL_INITIAL (value
) = width
;
6664 if (warn_cxx_compat
&& DECL_NAME (value
) != NULL_TREE
)
6666 /* If we currently have a binding for this field, set the
6667 in_struct field in the binding, so that we warn about lookups
6669 struct c_binding
*b
= I_SYMBOL_BINDING (DECL_NAME (value
));
6672 /* If the in_struct field is not yet set, push it on a list
6673 to be cleared when this struct is finished. */
6676 VEC_safe_push (c_binding_ptr
, heap
,
6677 struct_parse_info
->fields
, b
);
6686 /* Subroutine of detect_field_duplicates: add the fields of FIELDLIST
6687 to HTAB, giving errors for any duplicates. */
6690 detect_field_duplicates_hash (tree fieldlist
, htab_t htab
)
6695 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
6696 if ((y
= DECL_NAME (x
)) != 0)
6698 slot
= htab_find_slot (htab
, y
, INSERT
);
6701 error ("duplicate member %q+D", x
);
6702 DECL_NAME (x
) = NULL_TREE
;
6706 else if (TREE_CODE (TREE_TYPE (x
)) == RECORD_TYPE
6707 || TREE_CODE (TREE_TYPE (x
)) == UNION_TYPE
)
6708 detect_field_duplicates_hash (TYPE_FIELDS (TREE_TYPE (x
)), htab
);
6711 /* Generate an error for any duplicate field names in FIELDLIST. Munge
6712 the list such that this does not present a problem later. */
6715 detect_field_duplicates (tree fieldlist
)
6720 /* If the struct is the list of instance variables of an Objective-C
6721 class, then we need to add all the instance variables of
6722 superclasses before checking for duplicates (since you can't have
6723 an instance variable in a subclass with the same name as an
6724 instance variable in a superclass). objc_get_interface_ivars()
6725 leaves fieldlist unchanged if we are not in this case, so in that
6726 case nothing changes compared to C.
6728 if (c_dialect_objc ())
6729 fieldlist
= objc_get_interface_ivars (fieldlist
);
6731 /* First, see if there are more than "a few" fields.
6732 This is trivially true if there are zero or one fields. */
6735 x
= DECL_CHAIN (fieldlist
);
6740 if (DECL_NAME (x
) == NULL_TREE
6741 && (TREE_CODE (TREE_TYPE (x
)) == RECORD_TYPE
6742 || TREE_CODE (TREE_TYPE (x
)) == UNION_TYPE
))
6745 } while (timeout
> 0 && x
);
6747 /* If there were "few" fields and no anonymous structures or unions,
6748 avoid the overhead of allocating a hash table. Instead just do
6749 the nested traversal thing. */
6752 for (x
= DECL_CHAIN (fieldlist
); x
; x
= DECL_CHAIN (x
))
6755 for (y
= fieldlist
; y
!= x
; y
= TREE_CHAIN (y
))
6756 if (DECL_NAME (y
) == DECL_NAME (x
))
6758 error ("duplicate member %q+D", x
);
6759 DECL_NAME (x
) = NULL_TREE
;
6765 htab_t htab
= htab_create (37, htab_hash_pointer
, htab_eq_pointer
, NULL
);
6767 detect_field_duplicates_hash (fieldlist
, htab
);
6772 /* Finish up struct info used by -Wc++-compat. */
6775 warn_cxx_compat_finish_struct (tree fieldlist
)
6779 struct c_binding
*b
;
6781 /* Set the C_TYPE_DEFINED_IN_STRUCT flag for each type defined in
6782 the current struct. We do this now at the end of the struct
6783 because the flag is used to issue visibility warnings, and we
6784 only want to issue those warnings if the type is referenced
6785 outside of the struct declaration. */
6786 FOR_EACH_VEC_ELT (tree
, struct_parse_info
->struct_types
, ix
, x
)
6787 C_TYPE_DEFINED_IN_STRUCT (x
) = 1;
6789 /* The TYPEDEFS_SEEN field of STRUCT_PARSE_INFO is a list of
6790 typedefs used when declaring fields in this struct. If the name
6791 of any of the fields is also a typedef name then the struct would
6792 not parse in C++, because the C++ lookup rules say that the
6793 typedef name would be looked up in the context of the struct, and
6794 would thus be the field rather than the typedef. */
6795 if (!VEC_empty (tree
, struct_parse_info
->typedefs_seen
)
6796 && fieldlist
!= NULL_TREE
)
6798 /* Use a pointer_set using the name of the typedef. We can use
6799 a pointer_set because identifiers are interned. */
6800 struct pointer_set_t
*tset
= pointer_set_create ();
6802 FOR_EACH_VEC_ELT (tree
, struct_parse_info
->typedefs_seen
, ix
, x
)
6803 pointer_set_insert (tset
, DECL_NAME (x
));
6805 for (x
= fieldlist
; x
!= NULL_TREE
; x
= DECL_CHAIN (x
))
6807 if (pointer_set_contains (tset
, DECL_NAME (x
)))
6809 warning_at (DECL_SOURCE_LOCATION (x
), OPT_Wc___compat
,
6810 ("using %qD as both field and typedef name is "
6813 /* FIXME: It would be nice to report the location where
6814 the typedef name is used. */
6818 pointer_set_destroy (tset
);
6821 /* For each field which has a binding and which was not defined in
6822 an enclosing struct, clear the in_struct field. */
6823 FOR_EACH_VEC_ELT (c_binding_ptr
, struct_parse_info
->fields
, ix
, b
)
6827 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
6828 LOC is the location of the RECORD_TYPE or UNION_TYPE's definition.
6829 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
6830 ATTRIBUTES are attributes to be applied to the structure.
6832 ENCLOSING_STRUCT_PARSE_INFO is the value of STRUCT_PARSE_INFO when
6833 the struct was started. */
6836 finish_struct (location_t loc
, tree t
, tree fieldlist
, tree attributes
,
6837 struct c_struct_parse_info
*enclosing_struct_parse_info
)
6840 bool toplevel
= file_scope
== current_scope
;
6841 int saw_named_field
;
6843 /* If this type was previously laid out as a forward reference,
6844 make sure we lay it out again. */
6848 decl_attributes (&t
, attributes
, (int) ATTR_FLAG_TYPE_IN_PLACE
);
6852 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
6854 if (DECL_NAME (x
) != 0)
6857 && (TREE_CODE (TREE_TYPE (x
)) == RECORD_TYPE
6858 || TREE_CODE (TREE_TYPE (x
)) == UNION_TYPE
))
6864 if (TREE_CODE (t
) == UNION_TYPE
)
6867 pedwarn (loc
, OPT_pedantic
, "union has no named members");
6869 pedwarn (loc
, OPT_pedantic
, "union has no members");
6874 pedwarn (loc
, OPT_pedantic
, "struct has no named members");
6876 pedwarn (loc
, OPT_pedantic
, "struct has no members");
6881 /* Install struct as DECL_CONTEXT of each field decl.
6882 Also process specified field sizes, found in the DECL_INITIAL,
6883 storing 0 there after the type has been changed to precision equal
6884 to its width, rather than the precision of the specified standard
6885 type. (Correct layout requires the original type to have been preserved
6888 saw_named_field
= 0;
6889 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
6891 if (TREE_TYPE (x
) == error_mark_node
)
6894 DECL_CONTEXT (x
) = t
;
6896 /* If any field is const, the structure type is pseudo-const. */
6897 if (TREE_READONLY (x
))
6898 C_TYPE_FIELDS_READONLY (t
) = 1;
6901 /* A field that is pseudo-const makes the structure likewise. */
6902 tree t1
= strip_array_types (TREE_TYPE (x
));
6903 if ((TREE_CODE (t1
) == RECORD_TYPE
|| TREE_CODE (t1
) == UNION_TYPE
)
6904 && C_TYPE_FIELDS_READONLY (t1
))
6905 C_TYPE_FIELDS_READONLY (t
) = 1;
6908 /* Any field that is volatile means variables of this type must be
6909 treated in some ways as volatile. */
6910 if (TREE_THIS_VOLATILE (x
))
6911 C_TYPE_FIELDS_VOLATILE (t
) = 1;
6913 /* Any field of nominal variable size implies structure is too. */
6914 if (C_DECL_VARIABLE_SIZE (x
))
6915 C_TYPE_VARIABLE_SIZE (t
) = 1;
6917 if (DECL_INITIAL (x
))
6919 unsigned HOST_WIDE_INT width
= tree_low_cst (DECL_INITIAL (x
), 1);
6920 DECL_SIZE (x
) = bitsize_int (width
);
6921 DECL_BIT_FIELD (x
) = 1;
6922 SET_DECL_C_BIT_FIELD (x
);
6926 && (DECL_BIT_FIELD (x
)
6927 || TYPE_ALIGN (TREE_TYPE (x
)) > BITS_PER_UNIT
))
6928 DECL_PACKED (x
) = 1;
6930 /* Detect flexible array member in an invalid context. */
6931 if (TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
6932 && TYPE_SIZE (TREE_TYPE (x
)) == NULL_TREE
6933 && TYPE_DOMAIN (TREE_TYPE (x
)) != NULL_TREE
6934 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x
))) == NULL_TREE
)
6936 if (TREE_CODE (t
) == UNION_TYPE
)
6938 error_at (DECL_SOURCE_LOCATION (x
),
6939 "flexible array member in union");
6940 TREE_TYPE (x
) = error_mark_node
;
6942 else if (DECL_CHAIN (x
) != NULL_TREE
)
6944 error_at (DECL_SOURCE_LOCATION (x
),
6945 "flexible array member not at end of struct");
6946 TREE_TYPE (x
) = error_mark_node
;
6948 else if (!saw_named_field
)
6950 error_at (DECL_SOURCE_LOCATION (x
),
6951 "flexible array member in otherwise empty struct");
6952 TREE_TYPE (x
) = error_mark_node
;
6956 if (pedantic
&& TREE_CODE (t
) == RECORD_TYPE
6957 && flexible_array_type_p (TREE_TYPE (x
)))
6958 pedwarn (DECL_SOURCE_LOCATION (x
), OPT_pedantic
,
6959 "invalid use of structure with flexible array member");
6962 || TREE_CODE (TREE_TYPE (x
)) == RECORD_TYPE
6963 || TREE_CODE (TREE_TYPE (x
)) == UNION_TYPE
)
6964 saw_named_field
= 1;
6967 detect_field_duplicates (fieldlist
);
6969 /* Now we have the nearly final fieldlist. Record it,
6970 then lay out the structure or union (including the fields). */
6972 TYPE_FIELDS (t
) = fieldlist
;
6976 /* Give bit-fields their proper types. */
6978 tree
*fieldlistp
= &fieldlist
;
6980 if (TREE_CODE (*fieldlistp
) == FIELD_DECL
&& DECL_INITIAL (*fieldlistp
)
6981 && TREE_TYPE (*fieldlistp
) != error_mark_node
)
6983 unsigned HOST_WIDE_INT width
6984 = tree_low_cst (DECL_INITIAL (*fieldlistp
), 1);
6985 tree type
= TREE_TYPE (*fieldlistp
);
6986 if (width
!= TYPE_PRECISION (type
))
6988 TREE_TYPE (*fieldlistp
)
6989 = c_build_bitfield_integer_type (width
, TYPE_UNSIGNED (type
));
6990 DECL_MODE (*fieldlistp
) = TYPE_MODE (TREE_TYPE (*fieldlistp
));
6992 DECL_INITIAL (*fieldlistp
) = 0;
6995 fieldlistp
= &DECL_CHAIN (*fieldlistp
);
6998 /* Now we have the truly final field list.
6999 Store it in this type and in the variants. */
7001 TYPE_FIELDS (t
) = fieldlist
;
7003 /* If there are lots of fields, sort so we can look through them fast.
7004 We arbitrarily consider 16 or more elts to be "a lot". */
7009 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
7011 if (len
> 15 || DECL_NAME (x
) == NULL
)
7019 struct lang_type
*space
;
7020 struct sorted_fields_type
*space2
;
7022 len
+= list_length (x
);
7024 /* Use the same allocation policy here that make_node uses, to
7025 ensure that this lives as long as the rest of the struct decl.
7026 All decls in an inline function need to be saved. */
7028 space
= ggc_alloc_cleared_lang_type (sizeof (struct lang_type
));
7029 space2
= ggc_alloc_sorted_fields_type
7030 (sizeof (struct sorted_fields_type
) + len
* sizeof (tree
));
7034 field_array
= &space2
->elts
[0];
7035 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
7037 field_array
[len
++] = x
;
7039 /* If there is anonymous struct or union, break out of the loop. */
7040 if (DECL_NAME (x
) == NULL
)
7043 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
7046 TYPE_LANG_SPECIFIC (t
) = space
;
7047 TYPE_LANG_SPECIFIC (t
)->s
->len
= len
;
7048 field_array
= TYPE_LANG_SPECIFIC (t
)->s
->elts
;
7049 qsort (field_array
, len
, sizeof (tree
), field_decl_cmp
);
7054 for (x
= TYPE_MAIN_VARIANT (t
); x
; x
= TYPE_NEXT_VARIANT (x
))
7056 TYPE_FIELDS (x
) = TYPE_FIELDS (t
);
7057 TYPE_LANG_SPECIFIC (x
) = TYPE_LANG_SPECIFIC (t
);
7058 C_TYPE_FIELDS_READONLY (x
) = C_TYPE_FIELDS_READONLY (t
);
7059 C_TYPE_FIELDS_VOLATILE (x
) = C_TYPE_FIELDS_VOLATILE (t
);
7060 C_TYPE_VARIABLE_SIZE (x
) = C_TYPE_VARIABLE_SIZE (t
);
7063 /* If this was supposed to be a transparent union, but we can't
7064 make it one, warn and turn off the flag. */
7065 if (TREE_CODE (t
) == UNION_TYPE
7066 && TYPE_TRANSPARENT_AGGR (t
)
7067 && (!TYPE_FIELDS (t
) || TYPE_MODE (t
) != DECL_MODE (TYPE_FIELDS (t
))))
7069 TYPE_TRANSPARENT_AGGR (t
) = 0;
7070 warning_at (loc
, 0, "union cannot be made transparent");
7073 /* If this structure or union completes the type of any previous
7074 variable declaration, lay it out and output its rtl. */
7075 for (x
= C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t
));
7079 tree decl
= TREE_VALUE (x
);
7080 if (TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
)
7081 layout_array_type (TREE_TYPE (decl
));
7082 if (TREE_CODE (decl
) != TYPE_DECL
)
7084 layout_decl (decl
, 0);
7085 if (c_dialect_objc ())
7086 objc_check_decl (decl
);
7087 rest_of_decl_compilation (decl
, toplevel
, 0);
7092 C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t
)) = 0;
7094 /* Update type location to the one of the definition, instead of e.g.
7095 a forward declaration. */
7096 if (TYPE_STUB_DECL (t
))
7097 DECL_SOURCE_LOCATION (TYPE_STUB_DECL (t
)) = loc
;
7099 /* Finish debugging output for this type. */
7100 rest_of_type_compilation (t
, toplevel
);
7102 /* If we're inside a function proper, i.e. not file-scope and not still
7103 parsing parameters, then arrange for the size of a variable sized type
7105 if (cur_stmt_list
&& variably_modified_type_p (t
, NULL_TREE
))
7106 add_stmt (build_stmt (loc
,
7107 DECL_EXPR
, build_decl (loc
, TYPE_DECL
, NULL
, t
)));
7109 if (warn_cxx_compat
)
7110 warn_cxx_compat_finish_struct (fieldlist
);
7112 VEC_free (tree
, heap
, struct_parse_info
->struct_types
);
7113 VEC_free (c_binding_ptr
, heap
, struct_parse_info
->fields
);
7114 VEC_free (tree
, heap
, struct_parse_info
->typedefs_seen
);
7115 XDELETE (struct_parse_info
);
7117 struct_parse_info
= enclosing_struct_parse_info
;
7119 /* If this struct is defined inside a struct, add it to
7122 && struct_parse_info
!= NULL
7123 && !in_sizeof
&& !in_typeof
&& !in_alignof
)
7124 VEC_safe_push (tree
, heap
, struct_parse_info
->struct_types
, t
);
7129 /* Lay out the type T, and its element type, and so on. */
7132 layout_array_type (tree t
)
7134 if (TREE_CODE (TREE_TYPE (t
)) == ARRAY_TYPE
)
7135 layout_array_type (TREE_TYPE (t
));
7139 /* Begin compiling the definition of an enumeration type.
7140 NAME is its name (or null if anonymous).
7141 LOC is the enum's location.
7142 Returns the type object, as yet incomplete.
7143 Also records info about it so that build_enumerator
7144 may be used to declare the individual values as they are read. */
7147 start_enum (location_t loc
, struct c_enum_contents
*the_enum
, tree name
)
7149 tree enumtype
= NULL_TREE
;
7150 location_t enumloc
= UNKNOWN_LOCATION
;
7152 /* If this is the real definition for a previous forward reference,
7153 fill in the contents in the same object that used to be the
7154 forward reference. */
7156 if (name
!= NULL_TREE
)
7157 enumtype
= lookup_tag (ENUMERAL_TYPE
, name
, 1, &enumloc
);
7159 if (enumtype
== 0 || TREE_CODE (enumtype
) != ENUMERAL_TYPE
)
7161 enumtype
= make_node (ENUMERAL_TYPE
);
7162 pushtag (loc
, name
, enumtype
);
7165 if (C_TYPE_BEING_DEFINED (enumtype
))
7166 error_at (loc
, "nested redefinition of %<enum %E%>", name
);
7168 C_TYPE_BEING_DEFINED (enumtype
) = 1;
7170 if (TYPE_VALUES (enumtype
) != 0)
7172 /* This enum is a named one that has been declared already. */
7173 error_at (loc
, "redeclaration of %<enum %E%>", name
);
7174 if (enumloc
!= UNKNOWN_LOCATION
)
7175 inform (enumloc
, "originally defined here");
7177 /* Completely replace its old definition.
7178 The old enumerators remain defined, however. */
7179 TYPE_VALUES (enumtype
) = 0;
7182 the_enum
->enum_next_value
= integer_zero_node
;
7183 the_enum
->enum_overflow
= 0;
7185 if (flag_short_enums
)
7186 TYPE_PACKED (enumtype
) = 1;
7188 /* FIXME: This will issue a warning for a use of a type defined
7189 within sizeof in a statement expr. This is not terribly serious
7190 as C++ doesn't permit statement exprs within sizeof anyhow. */
7191 if (warn_cxx_compat
&& (in_sizeof
|| in_typeof
|| in_alignof
))
7192 warning_at (loc
, OPT_Wc___compat
,
7193 "defining type in %qs expression is invalid in C++",
7196 : (in_typeof
? "typeof" : "alignof")));
7201 /* After processing and defining all the values of an enumeration type,
7202 install their decls in the enumeration type and finish it off.
7203 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
7204 and ATTRIBUTES are the specified attributes.
7205 Returns ENUMTYPE. */
7208 finish_enum (tree enumtype
, tree values
, tree attributes
)
7211 tree minnode
= 0, maxnode
= 0;
7212 int precision
, unsign
;
7213 bool toplevel
= (file_scope
== current_scope
);
7214 struct lang_type
*lt
;
7216 decl_attributes (&enumtype
, attributes
, (int) ATTR_FLAG_TYPE_IN_PLACE
);
7218 /* Calculate the maximum value of any enumerator in this type. */
7220 if (values
== error_mark_node
)
7221 minnode
= maxnode
= integer_zero_node
;
7224 minnode
= maxnode
= TREE_VALUE (values
);
7225 for (pair
= TREE_CHAIN (values
); pair
; pair
= TREE_CHAIN (pair
))
7227 tree value
= TREE_VALUE (pair
);
7228 if (tree_int_cst_lt (maxnode
, value
))
7230 if (tree_int_cst_lt (value
, minnode
))
7235 /* Construct the final type of this enumeration. It is the same
7236 as one of the integral types - the narrowest one that fits, except
7237 that normally we only go as narrow as int - and signed iff any of
7238 the values are negative. */
7239 unsign
= (tree_int_cst_sgn (minnode
) >= 0);
7240 precision
= MAX (tree_int_cst_min_precision (minnode
, unsign
),
7241 tree_int_cst_min_precision (maxnode
, unsign
));
7243 if (TYPE_PACKED (enumtype
) || precision
> TYPE_PRECISION (integer_type_node
))
7245 tem
= c_common_type_for_size (precision
, unsign
);
7248 warning (0, "enumeration values exceed range of largest integer");
7249 tem
= long_long_integer_type_node
;
7253 tem
= unsign
? unsigned_type_node
: integer_type_node
;
7255 TYPE_MIN_VALUE (enumtype
) = TYPE_MIN_VALUE (tem
);
7256 TYPE_MAX_VALUE (enumtype
) = TYPE_MAX_VALUE (tem
);
7257 TYPE_UNSIGNED (enumtype
) = TYPE_UNSIGNED (tem
);
7258 TYPE_SIZE (enumtype
) = 0;
7260 /* If the precision of the type was specific with an attribute and it
7261 was too small, give an error. Otherwise, use it. */
7262 if (TYPE_PRECISION (enumtype
))
7264 if (precision
> TYPE_PRECISION (enumtype
))
7265 error ("specified mode too small for enumeral values");
7268 TYPE_PRECISION (enumtype
) = TYPE_PRECISION (tem
);
7270 layout_type (enumtype
);
7272 if (values
!= error_mark_node
)
7274 /* Change the type of the enumerators to be the enum type. We
7275 need to do this irrespective of the size of the enum, for
7276 proper type checking. Replace the DECL_INITIALs of the
7277 enumerators, and the value slots of the list, with copies
7278 that have the enum type; they cannot be modified in place
7279 because they may be shared (e.g. integer_zero_node) Finally,
7280 change the purpose slots to point to the names of the decls. */
7281 for (pair
= values
; pair
; pair
= TREE_CHAIN (pair
))
7283 tree enu
= TREE_PURPOSE (pair
);
7284 tree ini
= DECL_INITIAL (enu
);
7286 TREE_TYPE (enu
) = enumtype
;
7288 /* The ISO C Standard mandates enumerators to have type int,
7289 even though the underlying type of an enum type is
7290 unspecified. However, GCC allows enumerators of any
7291 integer type as an extensions. build_enumerator()
7292 converts any enumerators that fit in an int to type int,
7293 to avoid promotions to unsigned types when comparing
7294 integers with enumerators that fit in the int range.
7295 When -pedantic is given, build_enumerator() would have
7296 already warned about those that don't fit. Here we
7297 convert the rest to the enumerator type. */
7298 if (TREE_TYPE (ini
) != integer_type_node
)
7299 ini
= convert (enumtype
, ini
);
7301 DECL_INITIAL (enu
) = ini
;
7302 TREE_PURPOSE (pair
) = DECL_NAME (enu
);
7303 TREE_VALUE (pair
) = ini
;
7306 TYPE_VALUES (enumtype
) = values
;
7309 /* Record the min/max values so that we can warn about bit-field
7310 enumerations that are too small for the values. */
7311 lt
= ggc_alloc_cleared_lang_type (sizeof (struct lang_type
));
7312 lt
->enum_min
= minnode
;
7313 lt
->enum_max
= maxnode
;
7314 TYPE_LANG_SPECIFIC (enumtype
) = lt
;
7316 /* Fix up all variant types of this enum type. */
7317 for (tem
= TYPE_MAIN_VARIANT (enumtype
); tem
; tem
= TYPE_NEXT_VARIANT (tem
))
7319 if (tem
== enumtype
)
7321 TYPE_VALUES (tem
) = TYPE_VALUES (enumtype
);
7322 TYPE_MIN_VALUE (tem
) = TYPE_MIN_VALUE (enumtype
);
7323 TYPE_MAX_VALUE (tem
) = TYPE_MAX_VALUE (enumtype
);
7324 TYPE_SIZE (tem
) = TYPE_SIZE (enumtype
);
7325 TYPE_SIZE_UNIT (tem
) = TYPE_SIZE_UNIT (enumtype
);
7326 SET_TYPE_MODE (tem
, TYPE_MODE (enumtype
));
7327 TYPE_PRECISION (tem
) = TYPE_PRECISION (enumtype
);
7328 TYPE_ALIGN (tem
) = TYPE_ALIGN (enumtype
);
7329 TYPE_USER_ALIGN (tem
) = TYPE_USER_ALIGN (enumtype
);
7330 TYPE_UNSIGNED (tem
) = TYPE_UNSIGNED (enumtype
);
7331 TYPE_LANG_SPECIFIC (tem
) = TYPE_LANG_SPECIFIC (enumtype
);
7334 /* Finish debugging output for this type. */
7335 rest_of_type_compilation (enumtype
, toplevel
);
7337 /* If this enum is defined inside a struct, add it to
7340 && struct_parse_info
!= NULL
7341 && !in_sizeof
&& !in_typeof
&& !in_alignof
)
7342 VEC_safe_push (tree
, heap
, struct_parse_info
->struct_types
, enumtype
);
7347 /* Build and install a CONST_DECL for one value of the
7348 current enumeration type (one that was begun with start_enum).
7349 DECL_LOC is the location of the enumerator.
7350 LOC is the location of the '=' operator if any, DECL_LOC otherwise.
7351 Return a tree-list containing the CONST_DECL and its value.
7352 Assignment of sequential values by default is handled here. */
7355 build_enumerator (location_t decl_loc
, location_t loc
,
7356 struct c_enum_contents
*the_enum
, tree name
, tree value
)
7360 /* Validate and default VALUE. */
7364 /* Don't issue more errors for error_mark_node (i.e. an
7365 undeclared identifier) - just ignore the value expression. */
7366 if (value
== error_mark_node
)
7368 else if (!INTEGRAL_TYPE_P (TREE_TYPE (value
)))
7370 error_at (loc
, "enumerator value for %qE is not an integer constant",
7376 if (TREE_CODE (value
) != INTEGER_CST
)
7378 value
= c_fully_fold (value
, false, NULL
);
7379 if (TREE_CODE (value
) == INTEGER_CST
)
7380 pedwarn (loc
, OPT_pedantic
,
7381 "enumerator value for %qE is not an integer "
7382 "constant expression", name
);
7384 if (TREE_CODE (value
) != INTEGER_CST
)
7386 error ("enumerator value for %qE is not an integer constant",
7392 value
= default_conversion (value
);
7393 constant_expression_warning (value
);
7398 /* Default based on previous value. */
7399 /* It should no longer be possible to have NON_LVALUE_EXPR
7403 value
= the_enum
->enum_next_value
;
7404 if (the_enum
->enum_overflow
)
7405 error_at (loc
, "overflow in enumeration values");
7407 /* Even though the underlying type of an enum is unspecified, the
7408 type of enumeration constants is explicitly defined as int
7409 (6.4.4.3/2 in the C99 Standard). GCC allows any integer type as
7411 else if (!int_fits_type_p (value
, integer_type_node
))
7412 pedwarn (loc
, OPT_pedantic
,
7413 "ISO C restricts enumerator values to range of %<int%>");
7415 /* The ISO C Standard mandates enumerators to have type int, even
7416 though the underlying type of an enum type is unspecified.
7417 However, GCC allows enumerators of any integer type as an
7418 extensions. Here we convert any enumerators that fit in an int
7419 to type int, to avoid promotions to unsigned types when comparing
7420 integers with enumerators that fit in the int range. When
7421 -pedantic is given, we would have already warned about those that
7422 don't fit. We have to do this here rather than in finish_enum
7423 because this value may be used to define more enumerators. */
7424 if (int_fits_type_p (value
, integer_type_node
))
7425 value
= convert (integer_type_node
, value
);
7427 /* Set basis for default for next value. */
7428 the_enum
->enum_next_value
7430 (EXPR_HAS_LOCATION (value
) ? EXPR_LOCATION (value
) : input_location
,
7431 PLUS_EXPR
, value
, integer_one_node
, 0);
7432 the_enum
->enum_overflow
= tree_int_cst_lt (the_enum
->enum_next_value
, value
);
7434 /* Now create a declaration for the enum value name. */
7436 type
= TREE_TYPE (value
);
7437 type
= c_common_type_for_size (MAX (TYPE_PRECISION (type
),
7438 TYPE_PRECISION (integer_type_node
)),
7439 (TYPE_PRECISION (type
)
7440 >= TYPE_PRECISION (integer_type_node
)
7441 && TYPE_UNSIGNED (type
)));
7443 decl
= build_decl (decl_loc
, CONST_DECL
, name
, type
);
7444 DECL_INITIAL (decl
) = convert (type
, value
);
7447 return tree_cons (decl
, value
, NULL_TREE
);
7451 /* Create the FUNCTION_DECL for a function definition.
7452 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
7453 the declaration; they describe the function's name and the type it returns,
7454 but twisted together in a fashion that parallels the syntax of C.
7456 This function creates a binding context for the function body
7457 as well as setting up the FUNCTION_DECL in current_function_decl.
7459 Returns 1 on success. If the DECLARATOR is not suitable for a function
7460 (it defines a datum instead), we return 0, which tells
7461 yyparse to report a parse error. */
7464 start_function (struct c_declspecs
*declspecs
, struct c_declarator
*declarator
,
7467 tree decl1
, old_decl
;
7468 tree restype
, resdecl
;
7471 current_function_returns_value
= 0; /* Assume, until we see it does. */
7472 current_function_returns_null
= 0;
7473 current_function_returns_abnormally
= 0;
7474 warn_about_return_type
= 0;
7475 c_switch_stack
= NULL
;
7477 /* Indicate no valid break/continue context by setting these variables
7478 to some non-null, non-label value. We'll notice and emit the proper
7479 error message in c_finish_bc_stmt. */
7480 c_break_label
= c_cont_label
= size_zero_node
;
7482 decl1
= grokdeclarator (declarator
, declspecs
, FUNCDEF
, true, NULL
,
7483 &attributes
, NULL
, NULL
, DEPRECATED_NORMAL
);
7485 /* If the declarator is not suitable for a function definition,
7486 cause a syntax error. */
7490 loc
= DECL_SOURCE_LOCATION (decl1
);
7492 decl_attributes (&decl1
, attributes
, 0);
7494 if (DECL_DECLARED_INLINE_P (decl1
)
7495 && DECL_UNINLINABLE (decl1
)
7496 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1
)))
7497 warning_at (loc
, OPT_Wattributes
,
7498 "inline function %qD given attribute noinline",
7501 /* Handle gnu_inline attribute. */
7502 if (declspecs
->inline_p
7503 && !flag_gnu89_inline
7504 && TREE_CODE (decl1
) == FUNCTION_DECL
7505 && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl1
))
7506 || current_function_decl
))
7508 if (declspecs
->storage_class
!= csc_static
)
7509 DECL_EXTERNAL (decl1
) = !DECL_EXTERNAL (decl1
);
7512 announce_function (decl1
);
7514 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1
))))
7516 error_at (loc
, "return type is an incomplete type");
7517 /* Make it return void instead. */
7519 = build_function_type (void_type_node
,
7520 TYPE_ARG_TYPES (TREE_TYPE (decl1
)));
7523 if (warn_about_return_type
)
7524 pedwarn_c99 (loc
, flag_isoc99
? 0
7525 : (warn_return_type
? OPT_Wreturn_type
: OPT_Wimplicit_int
),
7526 "return type defaults to %<int%>");
7528 /* Make the init_value nonzero so pushdecl knows this is not tentative.
7529 error_mark_node is replaced below (in pop_scope) with the BLOCK. */
7530 DECL_INITIAL (decl1
) = error_mark_node
;
7532 /* A nested function is not global. */
7533 if (current_function_decl
!= 0)
7534 TREE_PUBLIC (decl1
) = 0;
7536 /* If this definition isn't a prototype and we had a prototype declaration
7537 before, copy the arg type info from that prototype. */
7538 old_decl
= lookup_name_in_scope (DECL_NAME (decl1
), current_scope
);
7539 if (old_decl
&& TREE_CODE (old_decl
) != FUNCTION_DECL
)
7541 current_function_prototype_locus
= UNKNOWN_LOCATION
;
7542 current_function_prototype_built_in
= false;
7543 current_function_prototype_arg_types
= NULL_TREE
;
7544 if (TYPE_ARG_TYPES (TREE_TYPE (decl1
)) == 0)
7546 if (old_decl
!= 0 && TREE_CODE (TREE_TYPE (old_decl
)) == FUNCTION_TYPE
7547 && comptypes (TREE_TYPE (TREE_TYPE (decl1
)),
7548 TREE_TYPE (TREE_TYPE (old_decl
))))
7550 TREE_TYPE (decl1
) = composite_type (TREE_TYPE (old_decl
),
7552 current_function_prototype_locus
= DECL_SOURCE_LOCATION (old_decl
);
7553 current_function_prototype_built_in
7554 = C_DECL_BUILTIN_PROTOTYPE (old_decl
);
7555 current_function_prototype_arg_types
7556 = TYPE_ARG_TYPES (TREE_TYPE (decl1
));
7558 if (TREE_PUBLIC (decl1
))
7560 /* If there is an external prototype declaration of this
7561 function, record its location but do not copy information
7562 to this decl. This may be an invisible declaration
7563 (built-in or in a scope which has finished) or simply
7564 have more refined argument types than any declaration
7566 struct c_binding
*b
;
7567 for (b
= I_SYMBOL_BINDING (DECL_NAME (decl1
)); b
; b
= b
->shadowed
)
7568 if (B_IN_SCOPE (b
, external_scope
))
7572 tree ext_decl
, ext_type
;
7574 ext_type
= b
->u
.type
? b
->u
.type
: TREE_TYPE (ext_decl
);
7575 if (TREE_CODE (ext_type
) == FUNCTION_TYPE
7576 && comptypes (TREE_TYPE (TREE_TYPE (decl1
)),
7577 TREE_TYPE (ext_type
)))
7579 current_function_prototype_locus
7580 = DECL_SOURCE_LOCATION (ext_decl
);
7581 current_function_prototype_built_in
7582 = C_DECL_BUILTIN_PROTOTYPE (ext_decl
);
7583 current_function_prototype_arg_types
7584 = TYPE_ARG_TYPES (ext_type
);
7590 /* Optionally warn of old-fashioned def with no previous prototype. */
7591 if (warn_strict_prototypes
7592 && old_decl
!= error_mark_node
7593 && TYPE_ARG_TYPES (TREE_TYPE (decl1
)) == 0
7594 && C_DECL_ISNT_PROTOTYPE (old_decl
))
7595 warning_at (loc
, OPT_Wstrict_prototypes
,
7596 "function declaration isn%'t a prototype");
7597 /* Optionally warn of any global def with no previous prototype. */
7598 else if (warn_missing_prototypes
7599 && old_decl
!= error_mark_node
7600 && TREE_PUBLIC (decl1
)
7601 && !MAIN_NAME_P (DECL_NAME (decl1
))
7602 && C_DECL_ISNT_PROTOTYPE (old_decl
))
7603 warning_at (loc
, OPT_Wmissing_prototypes
,
7604 "no previous prototype for %qD", decl1
);
7605 /* Optionally warn of any def with no previous prototype
7606 if the function has already been used. */
7607 else if (warn_missing_prototypes
7609 && old_decl
!= error_mark_node
7610 && TREE_USED (old_decl
)
7611 && TYPE_ARG_TYPES (TREE_TYPE (old_decl
)) == 0)
7612 warning_at (loc
, OPT_Wmissing_prototypes
,
7613 "%qD was used with no prototype before its definition", decl1
);
7614 /* Optionally warn of any global def with no previous declaration. */
7615 else if (warn_missing_declarations
7616 && TREE_PUBLIC (decl1
)
7618 && !MAIN_NAME_P (DECL_NAME (decl1
)))
7619 warning_at (loc
, OPT_Wmissing_declarations
,
7620 "no previous declaration for %qD",
7622 /* Optionally warn of any def with no previous declaration
7623 if the function has already been used. */
7624 else if (warn_missing_declarations
7626 && old_decl
!= error_mark_node
7627 && TREE_USED (old_decl
)
7628 && C_DECL_IMPLICIT (old_decl
))
7629 warning_at (loc
, OPT_Wmissing_declarations
,
7630 "%qD was used with no declaration before its definition", decl1
);
7632 /* This function exists in static storage.
7633 (This does not mean `static' in the C sense!) */
7634 TREE_STATIC (decl1
) = 1;
7636 /* This is the earliest point at which we might know the assembler
7637 name of the function. Thus, if it's set before this, die horribly. */
7638 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl1
));
7640 /* If #pragma weak was used, mark the decl weak now. */
7641 if (current_scope
== file_scope
)
7642 maybe_apply_pragma_weak (decl1
);
7644 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
7645 if (warn_main
&& MAIN_NAME_P (DECL_NAME (decl1
)))
7647 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1
)))
7648 != integer_type_node
)
7649 pedwarn (loc
, OPT_Wmain
, "return type of %qD is not %<int%>", decl1
);
7651 check_main_parameter_types (decl1
);
7653 if (!TREE_PUBLIC (decl1
))
7654 pedwarn (loc
, OPT_Wmain
,
7655 "%qD is normally a non-static function", decl1
);
7658 /* Record the decl so that the function name is defined.
7659 If we already have a decl for this name, and it is a FUNCTION_DECL,
7660 use the old decl. */
7662 current_function_decl
= pushdecl (decl1
);
7665 declare_parm_level ();
7667 restype
= TREE_TYPE (TREE_TYPE (current_function_decl
));
7668 resdecl
= build_decl (loc
, RESULT_DECL
, NULL_TREE
, restype
);
7669 DECL_ARTIFICIAL (resdecl
) = 1;
7670 DECL_IGNORED_P (resdecl
) = 1;
7671 DECL_RESULT (current_function_decl
) = resdecl
;
7673 start_fname_decls ();
7678 /* Subroutine of store_parm_decls which handles new-style function
7679 definitions (prototype format). The parms already have decls, so we
7680 need only record them as in effect and complain if any redundant
7681 old-style parm decls were written. */
7683 store_parm_decls_newstyle (tree fndecl
, const struct c_arg_info
*arg_info
)
7689 if (current_scope
->bindings
)
7691 error_at (DECL_SOURCE_LOCATION (fndecl
),
7692 "old-style parameter declarations in prototyped "
7693 "function definition");
7695 /* Get rid of the old-style declarations. */
7699 /* Don't issue this warning for nested functions, and don't issue this
7700 warning if we got here because ARG_INFO_TYPES was error_mark_node
7701 (this happens when a function definition has just an ellipsis in
7702 its parameter list). */
7703 else if (!in_system_header
&& !current_function_scope
7704 && arg_info
->types
!= error_mark_node
)
7705 warning_at (DECL_SOURCE_LOCATION (fndecl
), OPT_Wtraditional
,
7706 "traditional C rejects ISO C style function definitions");
7708 /* Now make all the parameter declarations visible in the function body.
7709 We can bypass most of the grunt work of pushdecl. */
7710 for (decl
= arg_info
->parms
; decl
; decl
= DECL_CHAIN (decl
))
7712 DECL_CONTEXT (decl
) = current_function_decl
;
7713 if (DECL_NAME (decl
))
7715 bind (DECL_NAME (decl
), decl
, current_scope
,
7716 /*invisible=*/false, /*nested=*/false,
7718 if (!TREE_USED (decl
))
7719 warn_if_shadowing (decl
);
7722 error_at (DECL_SOURCE_LOCATION (decl
), "parameter name omitted");
7725 /* Record the parameter list in the function declaration. */
7726 DECL_ARGUMENTS (fndecl
) = arg_info
->parms
;
7728 /* Now make all the ancillary declarations visible, likewise. */
7729 for (decl
= arg_info
->others
; decl
; decl
= DECL_CHAIN (decl
))
7731 DECL_CONTEXT (decl
) = current_function_decl
;
7732 if (DECL_NAME (decl
))
7733 bind (DECL_NAME (decl
), decl
, current_scope
,
7734 /*invisible=*/false,
7735 /*nested=*/(TREE_CODE (decl
) == FUNCTION_DECL
),
7739 /* And all the tag declarations. */
7740 FOR_EACH_VEC_ELT_REVERSE (c_arg_tag
, arg_info
->tags
, ix
, tag
)
7742 bind (tag
->id
, tag
->type
, current_scope
,
7743 /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION
);
7746 /* Subroutine of store_parm_decls which handles old-style function
7747 definitions (separate parameter list and declarations). */
7750 store_parm_decls_oldstyle (tree fndecl
, const struct c_arg_info
*arg_info
)
7752 struct c_binding
*b
;
7753 tree parm
, decl
, last
;
7754 tree parmids
= arg_info
->parms
;
7755 struct pointer_set_t
*seen_args
= pointer_set_create ();
7757 if (!in_system_header
)
7758 warning_at (DECL_SOURCE_LOCATION (fndecl
),
7759 OPT_Wold_style_definition
, "old-style function definition");
7761 /* Match each formal parameter name with its declaration. Save each
7762 decl in the appropriate TREE_PURPOSE slot of the parmids chain. */
7763 for (parm
= parmids
; parm
; parm
= TREE_CHAIN (parm
))
7765 if (TREE_VALUE (parm
) == 0)
7767 error_at (DECL_SOURCE_LOCATION (fndecl
),
7768 "parameter name missing from parameter list");
7769 TREE_PURPOSE (parm
) = 0;
7773 b
= I_SYMBOL_BINDING (TREE_VALUE (parm
));
7774 if (b
&& B_IN_CURRENT_SCOPE (b
))
7777 /* If we got something other than a PARM_DECL it is an error. */
7778 if (TREE_CODE (decl
) != PARM_DECL
)
7779 error_at (DECL_SOURCE_LOCATION (decl
),
7780 "%qD declared as a non-parameter", decl
);
7781 /* If the declaration is already marked, we have a duplicate
7782 name. Complain and ignore the duplicate. */
7783 else if (pointer_set_contains (seen_args
, decl
))
7785 error_at (DECL_SOURCE_LOCATION (decl
),
7786 "multiple parameters named %qD", decl
);
7787 TREE_PURPOSE (parm
) = 0;
7790 /* If the declaration says "void", complain and turn it into
7792 else if (VOID_TYPE_P (TREE_TYPE (decl
)))
7794 error_at (DECL_SOURCE_LOCATION (decl
),
7795 "parameter %qD declared with void type", decl
);
7796 TREE_TYPE (decl
) = integer_type_node
;
7797 DECL_ARG_TYPE (decl
) = integer_type_node
;
7798 layout_decl (decl
, 0);
7800 warn_if_shadowing (decl
);
7802 /* If no declaration found, default to int. */
7805 /* FIXME diagnostics: This should be the location of the argument,
7806 not the FNDECL. E.g., for an old-style declaration
7808 int f10(v) { blah; }
7810 We should use the location of the V, not the F10.
7811 Unfortunately, the V is an IDENTIFIER_NODE which has no
7812 location. In the future we need locations for c_arg_info
7815 See gcc.dg/Wshadow-3.c for an example of this problem. */
7816 decl
= build_decl (DECL_SOURCE_LOCATION (fndecl
),
7817 PARM_DECL
, TREE_VALUE (parm
), integer_type_node
);
7818 DECL_ARG_TYPE (decl
) = TREE_TYPE (decl
);
7820 warn_if_shadowing (decl
);
7823 pedwarn (DECL_SOURCE_LOCATION (decl
),
7824 0, "type of %qD defaults to %<int%>", decl
);
7826 warning_at (DECL_SOURCE_LOCATION (decl
),
7827 OPT_Wmissing_parameter_type
,
7828 "type of %qD defaults to %<int%>", decl
);
7831 TREE_PURPOSE (parm
) = decl
;
7832 pointer_set_insert (seen_args
, decl
);
7835 /* Now examine the parms chain for incomplete declarations
7836 and declarations with no corresponding names. */
7838 for (b
= current_scope
->bindings
; b
; b
= b
->prev
)
7841 if (TREE_CODE (parm
) != PARM_DECL
)
7844 if (TREE_TYPE (parm
) != error_mark_node
7845 && !COMPLETE_TYPE_P (TREE_TYPE (parm
)))
7847 error_at (DECL_SOURCE_LOCATION (parm
),
7848 "parameter %qD has incomplete type", parm
);
7849 TREE_TYPE (parm
) = error_mark_node
;
7852 if (!pointer_set_contains (seen_args
, parm
))
7854 error_at (DECL_SOURCE_LOCATION (parm
),
7855 "declaration for parameter %qD but no such parameter",
7858 /* Pretend the parameter was not missing.
7859 This gets us to a standard state and minimizes
7860 further error messages. */
7861 parmids
= chainon (parmids
, tree_cons (parm
, 0, 0));
7865 /* Chain the declarations together in the order of the list of
7866 names. Store that chain in the function decl, replacing the
7867 list of names. Update the current scope to match. */
7868 DECL_ARGUMENTS (fndecl
) = 0;
7870 for (parm
= parmids
; parm
; parm
= TREE_CHAIN (parm
))
7871 if (TREE_PURPOSE (parm
))
7873 if (parm
&& TREE_PURPOSE (parm
))
7875 last
= TREE_PURPOSE (parm
);
7876 DECL_ARGUMENTS (fndecl
) = last
;
7878 for (parm
= TREE_CHAIN (parm
); parm
; parm
= TREE_CHAIN (parm
))
7879 if (TREE_PURPOSE (parm
))
7881 DECL_CHAIN (last
) = TREE_PURPOSE (parm
);
7882 last
= TREE_PURPOSE (parm
);
7884 DECL_CHAIN (last
) = 0;
7887 pointer_set_destroy (seen_args
);
7889 /* If there was a previous prototype,
7890 set the DECL_ARG_TYPE of each argument according to
7891 the type previously specified, and report any mismatches. */
7893 if (current_function_prototype_arg_types
)
7896 for (parm
= DECL_ARGUMENTS (fndecl
),
7897 type
= current_function_prototype_arg_types
;
7898 parm
|| (type
&& TREE_VALUE (type
) != error_mark_node
7899 && (TYPE_MAIN_VARIANT (TREE_VALUE (type
)) != void_type_node
));
7900 parm
= DECL_CHAIN (parm
), type
= TREE_CHAIN (type
))
7902 if (parm
== 0 || type
== 0
7903 || TYPE_MAIN_VARIANT (TREE_VALUE (type
)) == void_type_node
)
7905 if (current_function_prototype_built_in
)
7906 warning_at (DECL_SOURCE_LOCATION (fndecl
),
7907 0, "number of arguments doesn%'t match "
7908 "built-in prototype");
7911 /* FIXME diagnostics: This should be the location of
7912 FNDECL, but there is bug when a prototype is
7913 declared inside function context, but defined
7914 outside of it (e.g., gcc.dg/pr15698-2.c). In
7915 which case FNDECL gets the location of the
7916 prototype, not the definition. */
7917 error_at (input_location
,
7918 "number of arguments doesn%'t match prototype");
7920 error_at (current_function_prototype_locus
,
7921 "prototype declaration");
7925 /* Type for passing arg must be consistent with that
7926 declared for the arg. ISO C says we take the unqualified
7927 type for parameters declared with qualified type. */
7928 if (TREE_TYPE (parm
) != error_mark_node
7929 && TREE_TYPE (type
) != error_mark_node
7930 && !comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm
)),
7931 TYPE_MAIN_VARIANT (TREE_VALUE (type
))))
7933 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm
))
7934 == TYPE_MAIN_VARIANT (TREE_VALUE (type
)))
7936 /* Adjust argument to match prototype. E.g. a previous
7937 `int foo(float);' prototype causes
7938 `int foo(x) float x; {...}' to be treated like
7939 `int foo(float x) {...}'. This is particularly
7940 useful for argument types like uid_t. */
7941 DECL_ARG_TYPE (parm
) = TREE_TYPE (parm
);
7943 if (targetm
.calls
.promote_prototypes (TREE_TYPE (current_function_decl
))
7944 && INTEGRAL_TYPE_P (TREE_TYPE (parm
))
7945 && TYPE_PRECISION (TREE_TYPE (parm
))
7946 < TYPE_PRECISION (integer_type_node
))
7947 DECL_ARG_TYPE (parm
) = integer_type_node
;
7949 /* ??? Is it possible to get here with a
7950 built-in prototype or will it always have
7951 been diagnosed as conflicting with an
7952 old-style definition and discarded? */
7953 if (current_function_prototype_built_in
)
7954 warning_at (DECL_SOURCE_LOCATION (parm
),
7955 OPT_pedantic
, "promoted argument %qD "
7956 "doesn%'t match built-in prototype", parm
);
7959 pedwarn (DECL_SOURCE_LOCATION (parm
),
7960 OPT_pedantic
, "promoted argument %qD "
7961 "doesn%'t match prototype", parm
);
7962 pedwarn (current_function_prototype_locus
, OPT_pedantic
,
7963 "prototype declaration");
7968 if (current_function_prototype_built_in
)
7969 warning_at (DECL_SOURCE_LOCATION (parm
),
7970 0, "argument %qD doesn%'t match "
7971 "built-in prototype", parm
);
7974 error_at (DECL_SOURCE_LOCATION (parm
),
7975 "argument %qD doesn%'t match prototype", parm
);
7976 error_at (current_function_prototype_locus
,
7977 "prototype declaration");
7982 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl
)) = 0;
7985 /* Otherwise, create a prototype that would match. */
7989 tree actual
= 0, last
= 0, type
;
7991 for (parm
= DECL_ARGUMENTS (fndecl
); parm
; parm
= DECL_CHAIN (parm
))
7993 type
= tree_cons (NULL_TREE
, DECL_ARG_TYPE (parm
), NULL_TREE
);
7995 TREE_CHAIN (last
) = type
;
8000 type
= tree_cons (NULL_TREE
, void_type_node
, NULL_TREE
);
8002 TREE_CHAIN (last
) = type
;
8006 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
8007 of the type of this function, but we need to avoid having this
8008 affect the types of other similarly-typed functions, so we must
8009 first force the generation of an identical (but separate) type
8010 node for the relevant function type. The new node we create
8011 will be a variant of the main variant of the original function
8014 TREE_TYPE (fndecl
) = build_variant_type_copy (TREE_TYPE (fndecl
));
8016 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl
)) = actual
;
8020 /* Store parameter declarations passed in ARG_INFO into the current
8021 function declaration. */
8024 store_parm_decls_from (struct c_arg_info
*arg_info
)
8026 current_function_arg_info
= arg_info
;
8027 store_parm_decls ();
8030 /* Store the parameter declarations into the current function declaration.
8031 This is called after parsing the parameter declarations, before
8032 digesting the body of the function.
8034 For an old-style definition, construct a prototype out of the old-style
8035 parameter declarations and inject it into the function's type. */
8038 store_parm_decls (void)
8040 tree fndecl
= current_function_decl
;
8043 /* The argument information block for FNDECL. */
8044 struct c_arg_info
*arg_info
= current_function_arg_info
;
8045 current_function_arg_info
= 0;
8047 /* True if this definition is written with a prototype. Note:
8048 despite C99 6.7.5.3p14, we can *not* treat an empty argument
8049 list in a function definition as equivalent to (void) -- an
8050 empty argument list specifies the function has no parameters,
8051 but only (void) sets up a prototype for future calls. */
8052 proto
= arg_info
->types
!= 0;
8055 store_parm_decls_newstyle (fndecl
, arg_info
);
8057 store_parm_decls_oldstyle (fndecl
, arg_info
);
8059 /* The next call to push_scope will be a function body. */
8061 next_is_function_body
= true;
8063 /* Write a record describing this function definition to the prototypes
8064 file (if requested). */
8066 gen_aux_info_record (fndecl
, 1, 0, proto
);
8068 /* Initialize the RTL code for the function. */
8069 allocate_struct_function (fndecl
, false);
8071 /* Begin the statement tree for this function. */
8072 DECL_SAVED_TREE (fndecl
) = push_stmt_list ();
8074 /* ??? Insert the contents of the pending sizes list into the function
8075 to be evaluated. The only reason left to have this is
8076 void foo(int n, int array[n++])
8077 because we throw away the array type in favor of a pointer type, and
8078 thus won't naturally see the SAVE_EXPR containing the increment. All
8079 other pending sizes would be handled by gimplify_parameters. */
8081 VEC(tree
,gc
) *pending_sizes
= get_pending_sizes ();
8085 FOR_EACH_VEC_ELT (tree
, pending_sizes
, i
, t
)
8089 /* Even though we're inside a function body, we still don't want to
8090 call expand_expr to calculate the size of a variable-sized array.
8091 We haven't necessarily assigned RTL to all variables yet, so it's
8092 not safe to try to expand expressions involving them. */
8093 cfun
->dont_save_pending_sizes_p
= 1;
8097 /* Finish up a function declaration and compile that function
8098 all the way to assembler language output. Then free the storage
8099 for the function definition.
8101 This is called after parsing the body of the function definition. */
8104 finish_function (void)
8106 tree fndecl
= current_function_decl
;
8108 if (TREE_CODE (fndecl
) == FUNCTION_DECL
8109 && targetm
.calls
.promote_prototypes (TREE_TYPE (fndecl
)))
8111 tree args
= DECL_ARGUMENTS (fndecl
);
8112 for (; args
; args
= DECL_CHAIN (args
))
8114 tree type
= TREE_TYPE (args
);
8115 if (INTEGRAL_TYPE_P (type
)
8116 && TYPE_PRECISION (type
) < TYPE_PRECISION (integer_type_node
))
8117 DECL_ARG_TYPE (args
) = integer_type_node
;
8121 if (DECL_INITIAL (fndecl
) && DECL_INITIAL (fndecl
) != error_mark_node
)
8122 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl
)) = fndecl
;
8124 /* Must mark the RESULT_DECL as being in this function. */
8126 if (DECL_RESULT (fndecl
) && DECL_RESULT (fndecl
) != error_mark_node
)
8127 DECL_CONTEXT (DECL_RESULT (fndecl
)) = fndecl
;
8129 if (MAIN_NAME_P (DECL_NAME (fndecl
)) && flag_hosted
8130 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl
)))
8131 == integer_type_node
&& flag_isoc99
)
8133 /* Hack. We don't want the middle-end to warn that this return
8134 is unreachable, so we mark its location as special. Using
8135 UNKNOWN_LOCATION has the problem that it gets clobbered in
8136 annotate_one_with_locus. A cleaner solution might be to
8137 ensure ! should_carry_locus_p (stmt), but that needs a flag.
8139 c_finish_return (BUILTINS_LOCATION
, integer_zero_node
, NULL_TREE
);
8142 /* Tie off the statement tree for this function. */
8143 DECL_SAVED_TREE (fndecl
) = pop_stmt_list (DECL_SAVED_TREE (fndecl
));
8145 finish_fname_decls ();
8147 /* Complain if there's just no return statement. */
8148 if (warn_return_type
8149 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl
))) != VOID_TYPE
8150 && !current_function_returns_value
&& !current_function_returns_null
8151 /* Don't complain if we are no-return. */
8152 && !current_function_returns_abnormally
8153 /* Don't complain if we are declared noreturn. */
8154 && !TREE_THIS_VOLATILE (fndecl
)
8155 /* Don't warn for main(). */
8156 && !MAIN_NAME_P (DECL_NAME (fndecl
))
8157 /* Or if they didn't actually specify a return type. */
8158 && !C_FUNCTION_IMPLICIT_INT (fndecl
)
8159 /* Normally, with -Wreturn-type, flow will complain, but we might
8160 optimize out static functions. */
8161 && !TREE_PUBLIC (fndecl
))
8163 warning (OPT_Wreturn_type
,
8164 "no return statement in function returning non-void");
8165 TREE_NO_WARNING (fndecl
) = 1;
8168 /* Complain about parameters that are only set, but never otherwise used. */
8169 if (warn_unused_but_set_parameter
)
8173 for (decl
= DECL_ARGUMENTS (fndecl
);
8175 decl
= DECL_CHAIN (decl
))
8176 if (TREE_USED (decl
)
8177 && TREE_CODE (decl
) == PARM_DECL
8178 && !DECL_READ_P (decl
)
8180 && !DECL_ARTIFICIAL (decl
)
8181 && !TREE_NO_WARNING (decl
))
8182 warning_at (DECL_SOURCE_LOCATION (decl
),
8183 OPT_Wunused_but_set_parameter
,
8184 "parameter %qD set but not used", decl
);
8187 /* Store the end of the function, so that we get good line number
8188 info for the epilogue. */
8189 cfun
->function_end_locus
= input_location
;
8191 /* Finalize the ELF visibility for the function. */
8192 c_determine_visibility (fndecl
);
8194 /* For GNU C extern inline functions disregard inline limits. */
8195 if (DECL_EXTERNAL (fndecl
)
8196 && DECL_DECLARED_INLINE_P (fndecl
))
8197 DECL_DISREGARD_INLINE_LIMITS (fndecl
) = 1;
8199 /* Genericize before inlining. Delay genericizing nested functions
8200 until their parent function is genericized. Since finalizing
8201 requires GENERIC, delay that as well. */
8203 if (DECL_INITIAL (fndecl
) && DECL_INITIAL (fndecl
) != error_mark_node
8204 && !undef_nested_function
)
8206 if (!decl_function_context (fndecl
))
8208 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE
, fndecl
);
8209 c_genericize (fndecl
);
8211 /* ??? Objc emits functions after finalizing the compilation unit.
8212 This should be cleaned up later and this conditional removed. */
8213 if (cgraph_global_info_ready
)
8215 cgraph_add_new_function (fndecl
, false);
8218 cgraph_finalize_function (fndecl
, false);
8222 /* Register this function with cgraph just far enough to get it
8223 added to our parent's nested function list. Handy, since the
8224 C front end doesn't have such a list. */
8225 (void) cgraph_node (fndecl
);
8229 if (!decl_function_context (fndecl
))
8230 undef_nested_function
= false;
8232 /* We're leaving the context of this function, so zap cfun.
8233 It's still in DECL_STRUCT_FUNCTION, and we'll restore it in
8234 tree_rest_of_compilation. */
8236 current_function_decl
= NULL
;
8239 /* Check the declarations given in a for-loop for satisfying the C99
8240 constraints. If exactly one such decl is found, return it. LOC is
8241 the location of the opening parenthesis of the for loop. */
8244 check_for_loop_decls (location_t loc
)
8246 struct c_binding
*b
;
8247 tree one_decl
= NULL_TREE
;
8252 static bool hint
= true;
8253 /* If we get here, declarations have been used in a for loop without
8254 the C99 for loop scope. This doesn't make much sense, so don't
8256 error_at (loc
, "%<for%> loop initial declarations "
8257 "are only allowed in C99 mode");
8261 "use option -std=c99 or -std=gnu99 to compile your code");
8266 /* C99 subclause 6.8.5 paragraph 3:
8268 [#3] The declaration part of a for statement shall only
8269 declare identifiers for objects having storage class auto or
8272 It isn't clear whether, in this sentence, "identifiers" binds to
8273 "shall only declare" or to "objects" - that is, whether all identifiers
8274 declared must be identifiers for objects, or whether the restriction
8275 only applies to those that are. (A question on this in comp.std.c
8276 in November 2000 received no answer.) We implement the strictest
8277 interpretation, to avoid creating an extension which later causes
8280 for (b
= current_scope
->bindings
; b
; b
= b
->prev
)
8283 tree decl
= b
->decl
;
8288 switch (TREE_CODE (decl
))
8292 location_t decl_loc
= DECL_SOURCE_LOCATION (decl
);
8293 if (TREE_STATIC (decl
))
8295 "declaration of static variable %qD in %<for%> loop "
8296 "initial declaration", decl
);
8297 else if (DECL_EXTERNAL (decl
))
8299 "declaration of %<extern%> variable %qD in %<for%> loop "
8300 "initial declaration", decl
);
8306 "%<struct %E%> declared in %<for%> loop initial "
8311 "%<union %E%> declared in %<for%> loop initial declaration",
8315 error_at (loc
, "%<enum %E%> declared in %<for%> loop "
8316 "initial declaration", id
);
8319 error_at (loc
, "declaration of non-variable "
8320 "%qD in %<for%> loop initial declaration", decl
);
8327 return n_decls
== 1 ? one_decl
: NULL_TREE
;
8330 /* Save and reinitialize the variables
8331 used during compilation of a C function. */
8334 c_push_function_context (void)
8336 struct language_function
*p
;
8337 p
= ggc_alloc_language_function ();
8340 p
->base
.x_stmt_tree
= c_stmt_tree
;
8341 p
->x_break_label
= c_break_label
;
8342 p
->x_cont_label
= c_cont_label
;
8343 p
->x_switch_stack
= c_switch_stack
;
8344 p
->arg_info
= current_function_arg_info
;
8345 p
->returns_value
= current_function_returns_value
;
8346 p
->returns_null
= current_function_returns_null
;
8347 p
->returns_abnormally
= current_function_returns_abnormally
;
8348 p
->warn_about_return_type
= warn_about_return_type
;
8350 push_function_context ();
8353 /* Restore the variables used during compilation of a C function. */
8356 c_pop_function_context (void)
8358 struct language_function
*p
;
8360 pop_function_context ();
8362 cfun
->language
= NULL
;
8364 if (DECL_STRUCT_FUNCTION (current_function_decl
) == 0
8365 && DECL_SAVED_TREE (current_function_decl
) == NULL_TREE
)
8367 /* Stop pointing to the local nodes about to be freed. */
8368 /* But DECL_INITIAL must remain nonzero so we know this
8369 was an actual function definition. */
8370 DECL_INITIAL (current_function_decl
) = error_mark_node
;
8371 DECL_ARGUMENTS (current_function_decl
) = 0;
8374 c_stmt_tree
= p
->base
.x_stmt_tree
;
8375 c_break_label
= p
->x_break_label
;
8376 c_cont_label
= p
->x_cont_label
;
8377 c_switch_stack
= p
->x_switch_stack
;
8378 current_function_arg_info
= p
->arg_info
;
8379 current_function_returns_value
= p
->returns_value
;
8380 current_function_returns_null
= p
->returns_null
;
8381 current_function_returns_abnormally
= p
->returns_abnormally
;
8382 warn_about_return_type
= p
->warn_about_return_type
;
8385 /* The functions below are required for functionality of doing
8386 function at once processing in the C front end. Currently these
8387 functions are not called from anywhere in the C front end, but as
8388 these changes continue, that will change. */
8390 /* Returns the stmt_tree (if any) to which statements are currently
8391 being added. If there is no active statement-tree, NULL is
8395 current_stmt_tree (void)
8397 return &c_stmt_tree
;
8400 /* Return the global value of T as a symbol. */
8403 identifier_global_value (tree t
)
8405 struct c_binding
*b
;
8407 for (b
= I_SYMBOL_BINDING (t
); b
; b
= b
->shadowed
)
8408 if (B_IN_FILE_SCOPE (b
) || B_IN_EXTERNAL_SCOPE (b
))
8414 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
8415 otherwise the name is found in ridpointers from RID_INDEX. */
8418 record_builtin_type (enum rid rid_index
, const char *name
, tree type
)
8422 id
= ridpointers
[(int) rid_index
];
8424 id
= get_identifier (name
);
8425 decl
= build_decl (UNKNOWN_LOCATION
, TYPE_DECL
, id
, type
);
8427 if (debug_hooks
->type_decl
)
8428 debug_hooks
->type_decl (decl
, false);
8431 /* Build the void_list_node (void_type_node having been created). */
8433 build_void_list_node (void)
8435 tree t
= build_tree_list (NULL_TREE
, void_type_node
);
8439 /* Return a c_parm structure with the given SPECS, ATTRS and DECLARATOR. */
8442 build_c_parm (struct c_declspecs
*specs
, tree attrs
,
8443 struct c_declarator
*declarator
)
8445 struct c_parm
*ret
= XOBNEW (&parser_obstack
, struct c_parm
);
8448 ret
->declarator
= declarator
;
8452 /* Return a declarator with nested attributes. TARGET is the inner
8453 declarator to which these attributes apply. ATTRS are the
8456 struct c_declarator
*
8457 build_attrs_declarator (tree attrs
, struct c_declarator
*target
)
8459 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
8460 ret
->kind
= cdk_attrs
;
8461 ret
->declarator
= target
;
8462 ret
->u
.attrs
= attrs
;
8466 /* Return a declarator for a function with arguments specified by ARGS
8467 and return type specified by TARGET. */
8469 struct c_declarator
*
8470 build_function_declarator (struct c_arg_info
*args
,
8471 struct c_declarator
*target
)
8473 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
8474 ret
->kind
= cdk_function
;
8475 ret
->declarator
= target
;
8476 ret
->u
.arg_info
= args
;
8480 /* Return a declarator for the identifier IDENT (which may be
8481 NULL_TREE for an abstract declarator). */
8483 struct c_declarator
*
8484 build_id_declarator (tree ident
)
8486 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
8488 ret
->declarator
= 0;
8490 /* Default value - may get reset to a more precise location. */
8491 ret
->id_loc
= input_location
;
8495 /* Return something to represent absolute declarators containing a *.
8496 TARGET is the absolute declarator that the * contains.
8497 TYPE_QUALS_ATTRS is a structure for type qualifiers and attributes
8498 to apply to the pointer type. */
8500 struct c_declarator
*
8501 make_pointer_declarator (struct c_declspecs
*type_quals_attrs
,
8502 struct c_declarator
*target
)
8506 struct c_declarator
*itarget
= target
;
8507 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
8508 if (type_quals_attrs
)
8510 attrs
= type_quals_attrs
->attrs
;
8511 quals
= quals_from_declspecs (type_quals_attrs
);
8512 if (attrs
!= NULL_TREE
)
8513 itarget
= build_attrs_declarator (attrs
, target
);
8515 ret
->kind
= cdk_pointer
;
8516 ret
->declarator
= itarget
;
8517 ret
->u
.pointer_quals
= quals
;
8521 /* Return a pointer to a structure for an empty list of declaration
8524 struct c_declspecs
*
8525 build_null_declspecs (void)
8527 struct c_declspecs
*ret
= XOBNEW (&parser_obstack
, struct c_declspecs
);
8532 ret
->typespec_word
= cts_none
;
8533 ret
->storage_class
= csc_none
;
8534 ret
->expr_const_operands
= true;
8535 ret
->declspecs_seen_p
= false;
8536 ret
->type_seen_p
= false;
8537 ret
->non_sc_seen_p
= false;
8538 ret
->typedef_p
= false;
8539 ret
->tag_defined_p
= false;
8540 ret
->explicit_signed_p
= false;
8541 ret
->deprecated_p
= false;
8542 ret
->default_int_p
= false;
8543 ret
->long_p
= false;
8544 ret
->long_long_p
= false;
8545 ret
->short_p
= false;
8546 ret
->signed_p
= false;
8547 ret
->unsigned_p
= false;
8548 ret
->complex_p
= false;
8549 ret
->inline_p
= false;
8550 ret
->thread_p
= false;
8551 ret
->const_p
= false;
8552 ret
->volatile_p
= false;
8553 ret
->restrict_p
= false;
8554 ret
->saturating_p
= false;
8555 ret
->address_space
= ADDR_SPACE_GENERIC
;
8559 /* Add the address space ADDRSPACE to the declaration specifiers
8560 SPECS, returning SPECS. */
8562 struct c_declspecs
*
8563 declspecs_add_addrspace (struct c_declspecs
*specs
, addr_space_t as
)
8565 specs
->non_sc_seen_p
= true;
8566 specs
->declspecs_seen_p
= true;
8568 if (!ADDR_SPACE_GENERIC_P (specs
->address_space
)
8569 && specs
->address_space
!= as
)
8570 error ("incompatible address space qualifiers %qs and %qs",
8571 c_addr_space_name (as
),
8572 c_addr_space_name (specs
->address_space
));
8574 specs
->address_space
= as
;
8578 /* Add the type qualifier QUAL to the declaration specifiers SPECS,
8581 struct c_declspecs
*
8582 declspecs_add_qual (struct c_declspecs
*specs
, tree qual
)
8586 specs
->non_sc_seen_p
= true;
8587 specs
->declspecs_seen_p
= true;
8588 gcc_assert (TREE_CODE (qual
) == IDENTIFIER_NODE
8589 && C_IS_RESERVED_WORD (qual
));
8590 i
= C_RID_CODE (qual
);
8594 dupe
= specs
->const_p
;
8595 specs
->const_p
= true;
8598 dupe
= specs
->volatile_p
;
8599 specs
->volatile_p
= true;
8602 dupe
= specs
->restrict_p
;
8603 specs
->restrict_p
= true;
8608 if (dupe
&& !flag_isoc99
)
8609 pedwarn (input_location
, OPT_pedantic
, "duplicate %qE", qual
);
8613 /* Add the type specifier TYPE to the declaration specifiers SPECS,
8616 struct c_declspecs
*
8617 declspecs_add_type (location_t loc
, struct c_declspecs
*specs
,
8618 struct c_typespec spec
)
8620 tree type
= spec
.spec
;
8621 specs
->non_sc_seen_p
= true;
8622 specs
->declspecs_seen_p
= true;
8623 specs
->type_seen_p
= true;
8624 if (TREE_DEPRECATED (type
))
8625 specs
->deprecated_p
= true;
8627 /* Handle type specifier keywords. */
8628 if (TREE_CODE (type
) == IDENTIFIER_NODE
8629 && C_IS_RESERVED_WORD (type
)
8630 && C_RID_CODE (type
) != RID_CXX_COMPAT_WARN
)
8632 enum rid i
= C_RID_CODE (type
);
8635 error_at (loc
, "two or more data types in declaration specifiers");
8638 if ((int) i
<= (int) RID_LAST_MODIFIER
)
8640 /* "long", "short", "signed", "unsigned", "_Complex" or "_Sat". */
8645 if (specs
->long_long_p
)
8647 error_at (loc
, "%<long long long%> is too long for GCC");
8652 if (specs
->typespec_word
== cts_double
)
8655 ("both %<long long%> and %<double%> in "
8656 "declaration specifiers"));
8659 pedwarn_c90 (loc
, OPT_Wlong_long
,
8660 "ISO C90 does not support %<long long%>");
8661 specs
->long_long_p
= 1;
8666 ("both %<long%> and %<short%> in "
8667 "declaration specifiers"));
8668 else if (specs
->typespec_word
== cts_void
)
8670 ("both %<long%> and %<void%> in "
8671 "declaration specifiers"));
8672 else if (specs
->typespec_word
== cts_int128
)
8674 ("both %<long%> and %<__int128%> in "
8675 "declaration specifiers"));
8676 else if (specs
->typespec_word
== cts_bool
)
8678 ("both %<long%> and %<_Bool%> in "
8679 "declaration specifiers"));
8680 else if (specs
->typespec_word
== cts_char
)
8682 ("both %<long%> and %<char%> in "
8683 "declaration specifiers"));
8684 else if (specs
->typespec_word
== cts_float
)
8686 ("both %<long%> and %<float%> in "
8687 "declaration specifiers"));
8688 else if (specs
->typespec_word
== cts_dfloat32
)
8690 ("both %<long%> and %<_Decimal32%> in "
8691 "declaration specifiers"));
8692 else if (specs
->typespec_word
== cts_dfloat64
)
8694 ("both %<long%> and %<_Decimal64%> in "
8695 "declaration specifiers"));
8696 else if (specs
->typespec_word
== cts_dfloat128
)
8698 ("both %<long%> and %<_Decimal128%> in "
8699 "declaration specifiers"));
8701 specs
->long_p
= true;
8704 dupe
= specs
->short_p
;
8707 ("both %<long%> and %<short%> in "
8708 "declaration specifiers"));
8709 else if (specs
->typespec_word
== cts_void
)
8711 ("both %<short%> and %<void%> in "
8712 "declaration specifiers"));
8713 else if (specs
->typespec_word
== cts_int128
)
8715 ("both %<short%> and %<__int128%> in "
8716 "declaration specifiers"));
8717 else if (specs
->typespec_word
== cts_bool
)
8719 ("both %<short%> and %<_Bool%> in "
8720 "declaration specifiers"));
8721 else if (specs
->typespec_word
== cts_char
)
8723 ("both %<short%> and %<char%> in "
8724 "declaration specifiers"));
8725 else if (specs
->typespec_word
== cts_float
)
8727 ("both %<short%> and %<float%> in "
8728 "declaration specifiers"));
8729 else if (specs
->typespec_word
== cts_double
)
8731 ("both %<short%> and %<double%> in "
8732 "declaration specifiers"));
8733 else if (specs
->typespec_word
== cts_dfloat32
)
8735 ("both %<short%> and %<_Decimal32%> in "
8736 "declaration specifiers"));
8737 else if (specs
->typespec_word
== cts_dfloat64
)
8739 ("both %<short%> and %<_Decimal64%> in "
8740 "declaration specifiers"));
8741 else if (specs
->typespec_word
== cts_dfloat128
)
8743 ("both %<short%> and %<_Decimal128%> in "
8744 "declaration specifiers"));
8746 specs
->short_p
= true;
8749 dupe
= specs
->signed_p
;
8750 if (specs
->unsigned_p
)
8752 ("both %<signed%> and %<unsigned%> in "
8753 "declaration specifiers"));
8754 else if (specs
->typespec_word
== cts_void
)
8756 ("both %<signed%> and %<void%> in "
8757 "declaration specifiers"));
8758 else if (specs
->typespec_word
== cts_bool
)
8760 ("both %<signed%> and %<_Bool%> in "
8761 "declaration specifiers"));
8762 else if (specs
->typespec_word
== cts_float
)
8764 ("both %<signed%> and %<float%> in "
8765 "declaration specifiers"));
8766 else if (specs
->typespec_word
== cts_double
)
8768 ("both %<signed%> and %<double%> in "
8769 "declaration specifiers"));
8770 else if (specs
->typespec_word
== cts_dfloat32
)
8772 ("both %<signed%> and %<_Decimal32%> in "
8773 "declaration specifiers"));
8774 else if (specs
->typespec_word
== cts_dfloat64
)
8776 ("both %<signed%> and %<_Decimal64%> in "
8777 "declaration specifiers"));
8778 else if (specs
->typespec_word
== cts_dfloat128
)
8780 ("both %<signed%> and %<_Decimal128%> in "
8781 "declaration specifiers"));
8783 specs
->signed_p
= true;
8786 dupe
= specs
->unsigned_p
;
8787 if (specs
->signed_p
)
8789 ("both %<signed%> and %<unsigned%> in "
8790 "declaration specifiers"));
8791 else if (specs
->typespec_word
== cts_void
)
8793 ("both %<unsigned%> and %<void%> in "
8794 "declaration specifiers"));
8795 else if (specs
->typespec_word
== cts_bool
)
8797 ("both %<unsigned%> and %<_Bool%> in "
8798 "declaration specifiers"));
8799 else if (specs
->typespec_word
== cts_float
)
8801 ("both %<unsigned%> and %<float%> in "
8802 "declaration specifiers"));
8803 else if (specs
->typespec_word
== cts_double
)
8805 ("both %<unsigned%> and %<double%> in "
8806 "declaration specifiers"));
8807 else if (specs
->typespec_word
== cts_dfloat32
)
8809 ("both %<unsigned%> and %<_Decimal32%> in "
8810 "declaration specifiers"));
8811 else if (specs
->typespec_word
== cts_dfloat64
)
8813 ("both %<unsigned%> and %<_Decimal64%> in "
8814 "declaration specifiers"));
8815 else if (specs
->typespec_word
== cts_dfloat128
)
8817 ("both %<unsigned%> and %<_Decimal128%> in "
8818 "declaration specifiers"));
8820 specs
->unsigned_p
= true;
8823 dupe
= specs
->complex_p
;
8824 if (!flag_isoc99
&& !in_system_header
)
8825 pedwarn (loc
, OPT_pedantic
,
8826 "ISO C90 does not support complex types");
8827 if (specs
->typespec_word
== cts_void
)
8829 ("both %<complex%> and %<void%> in "
8830 "declaration specifiers"));
8831 else if (specs
->typespec_word
== cts_bool
)
8833 ("both %<complex%> and %<_Bool%> in "
8834 "declaration specifiers"));
8835 else if (specs
->typespec_word
== cts_dfloat32
)
8837 ("both %<complex%> and %<_Decimal32%> in "
8838 "declaration specifiers"));
8839 else if (specs
->typespec_word
== cts_dfloat64
)
8841 ("both %<complex%> and %<_Decimal64%> in "
8842 "declaration specifiers"));
8843 else if (specs
->typespec_word
== cts_dfloat128
)
8845 ("both %<complex%> and %<_Decimal128%> in "
8846 "declaration specifiers"));
8847 else if (specs
->typespec_word
== cts_fract
)
8849 ("both %<complex%> and %<_Fract%> in "
8850 "declaration specifiers"));
8851 else if (specs
->typespec_word
== cts_accum
)
8853 ("both %<complex%> and %<_Accum%> in "
8854 "declaration specifiers"));
8855 else if (specs
->saturating_p
)
8857 ("both %<complex%> and %<_Sat%> in "
8858 "declaration specifiers"));
8860 specs
->complex_p
= true;
8863 dupe
= specs
->saturating_p
;
8864 pedwarn (loc
, OPT_pedantic
,
8865 "ISO C does not support saturating types");
8866 if (specs
->typespec_word
== cts_int128
)
8869 ("both %<_Sat%> and %<__int128%> in "
8870 "declaration specifiers"));
8872 else if (specs
->typespec_word
== cts_void
)
8874 ("both %<_Sat%> and %<void%> in "
8875 "declaration specifiers"));
8876 else if (specs
->typespec_word
== cts_bool
)
8878 ("both %<_Sat%> and %<_Bool%> in "
8879 "declaration specifiers"));
8880 else if (specs
->typespec_word
== cts_char
)
8882 ("both %<_Sat%> and %<char%> in "
8883 "declaration specifiers"));
8884 else if (specs
->typespec_word
== cts_int
)
8886 ("both %<_Sat%> and %<int%> in "
8887 "declaration specifiers"));
8888 else if (specs
->typespec_word
== cts_float
)
8890 ("both %<_Sat%> and %<float%> in "
8891 "declaration specifiers"));
8892 else if (specs
->typespec_word
== cts_double
)
8894 ("both %<_Sat%> and %<double%> in "
8895 "declaration specifiers"));
8896 else if (specs
->typespec_word
== cts_dfloat32
)
8898 ("both %<_Sat%> and %<_Decimal32%> in "
8899 "declaration specifiers"));
8900 else if (specs
->typespec_word
== cts_dfloat64
)
8902 ("both %<_Sat%> and %<_Decimal64%> in "
8903 "declaration specifiers"));
8904 else if (specs
->typespec_word
== cts_dfloat128
)
8906 ("both %<_Sat%> and %<_Decimal128%> in "
8907 "declaration specifiers"));
8908 else if (specs
->complex_p
)
8910 ("both %<_Sat%> and %<complex%> in "
8911 "declaration specifiers"));
8913 specs
->saturating_p
= true;
8920 error_at (loc
, "duplicate %qE", type
);
8926 /* "void", "_Bool", "char", "int", "float", "double", "_Decimal32",
8927 "__int128", "_Decimal64", "_Decimal128", "_Fract" or "_Accum". */
8928 if (specs
->typespec_word
!= cts_none
)
8931 "two or more data types in declaration specifiers");
8937 if (int128_integer_type_node
== NULL_TREE
)
8939 error_at (loc
, "%<__int128%> is not supported for this target");
8942 if (!in_system_header
)
8943 pedwarn (loc
, OPT_pedantic
,
8944 "ISO C does not support %<__int128%> type");
8948 ("both %<__int128%> and %<long%> in "
8949 "declaration specifiers"));
8950 else if (specs
->saturating_p
)
8952 ("both %<_Sat%> and %<__int128%> in "
8953 "declaration specifiers"));
8954 else if (specs
->short_p
)
8956 ("both %<__int128%> and %<short%> in "
8957 "declaration specifiers"));
8959 specs
->typespec_word
= cts_int128
;
8964 ("both %<long%> and %<void%> in "
8965 "declaration specifiers"));
8966 else if (specs
->short_p
)
8968 ("both %<short%> and %<void%> in "
8969 "declaration specifiers"));
8970 else if (specs
->signed_p
)
8972 ("both %<signed%> and %<void%> in "
8973 "declaration specifiers"));
8974 else if (specs
->unsigned_p
)
8976 ("both %<unsigned%> and %<void%> in "
8977 "declaration specifiers"));
8978 else if (specs
->complex_p
)
8980 ("both %<complex%> and %<void%> in "
8981 "declaration specifiers"));
8982 else if (specs
->saturating_p
)
8984 ("both %<_Sat%> and %<void%> in "
8985 "declaration specifiers"));
8987 specs
->typespec_word
= cts_void
;
8992 ("both %<long%> and %<_Bool%> in "
8993 "declaration specifiers"));
8994 else if (specs
->short_p
)
8996 ("both %<short%> and %<_Bool%> in "
8997 "declaration specifiers"));
8998 else if (specs
->signed_p
)
9000 ("both %<signed%> and %<_Bool%> in "
9001 "declaration specifiers"));
9002 else if (specs
->unsigned_p
)
9004 ("both %<unsigned%> and %<_Bool%> in "
9005 "declaration specifiers"));
9006 else if (specs
->complex_p
)
9008 ("both %<complex%> and %<_Bool%> in "
9009 "declaration specifiers"));
9010 else if (specs
->saturating_p
)
9012 ("both %<_Sat%> and %<_Bool%> in "
9013 "declaration specifiers"));
9015 specs
->typespec_word
= cts_bool
;
9020 ("both %<long%> and %<char%> in "
9021 "declaration specifiers"));
9022 else if (specs
->short_p
)
9024 ("both %<short%> and %<char%> in "
9025 "declaration specifiers"));
9026 else if (specs
->saturating_p
)
9028 ("both %<_Sat%> and %<char%> in "
9029 "declaration specifiers"));
9031 specs
->typespec_word
= cts_char
;
9034 if (specs
->saturating_p
)
9036 ("both %<_Sat%> and %<int%> in "
9037 "declaration specifiers"));
9039 specs
->typespec_word
= cts_int
;
9044 ("both %<long%> and %<float%> in "
9045 "declaration specifiers"));
9046 else if (specs
->short_p
)
9048 ("both %<short%> and %<float%> in "
9049 "declaration specifiers"));
9050 else if (specs
->signed_p
)
9052 ("both %<signed%> and %<float%> in "
9053 "declaration specifiers"));
9054 else if (specs
->unsigned_p
)
9056 ("both %<unsigned%> and %<float%> in "
9057 "declaration specifiers"));
9058 else if (specs
->saturating_p
)
9060 ("both %<_Sat%> and %<float%> in "
9061 "declaration specifiers"));
9063 specs
->typespec_word
= cts_float
;
9066 if (specs
->long_long_p
)
9068 ("both %<long long%> and %<double%> in "
9069 "declaration specifiers"));
9070 else if (specs
->short_p
)
9072 ("both %<short%> and %<double%> in "
9073 "declaration specifiers"));
9074 else if (specs
->signed_p
)
9076 ("both %<signed%> and %<double%> in "
9077 "declaration specifiers"));
9078 else if (specs
->unsigned_p
)
9080 ("both %<unsigned%> and %<double%> in "
9081 "declaration specifiers"));
9082 else if (specs
->saturating_p
)
9084 ("both %<_Sat%> and %<double%> in "
9085 "declaration specifiers"));
9087 specs
->typespec_word
= cts_double
;
9094 if (i
== RID_DFLOAT32
)
9096 else if (i
== RID_DFLOAT64
)
9099 str
= "_Decimal128";
9100 if (specs
->long_long_p
)
9102 ("both %<long long%> and %<%s%> in "
9103 "declaration specifiers"),
9107 ("both %<long%> and %<%s%> in "
9108 "declaration specifiers"),
9110 else if (specs
->short_p
)
9112 ("both %<short%> and %<%s%> in "
9113 "declaration specifiers"),
9115 else if (specs
->signed_p
)
9117 ("both %<signed%> and %<%s%> in "
9118 "declaration specifiers"),
9120 else if (specs
->unsigned_p
)
9122 ("both %<unsigned%> and %<%s%> in "
9123 "declaration specifiers"),
9125 else if (specs
->complex_p
)
9127 ("both %<complex%> and %<%s%> in "
9128 "declaration specifiers"),
9130 else if (specs
->saturating_p
)
9132 ("both %<_Sat%> and %<%s%> in "
9133 "declaration specifiers"),
9135 else if (i
== RID_DFLOAT32
)
9136 specs
->typespec_word
= cts_dfloat32
;
9137 else if (i
== RID_DFLOAT64
)
9138 specs
->typespec_word
= cts_dfloat64
;
9140 specs
->typespec_word
= cts_dfloat128
;
9142 if (!targetm
.decimal_float_supported_p ())
9144 ("decimal floating point not supported "
9145 "for this target"));
9146 pedwarn (loc
, OPT_pedantic
,
9147 "ISO C does not support decimal floating point");
9157 if (specs
->complex_p
)
9159 ("both %<complex%> and %<%s%> in "
9160 "declaration specifiers"),
9162 else if (i
== RID_FRACT
)
9163 specs
->typespec_word
= cts_fract
;
9165 specs
->typespec_word
= cts_accum
;
9167 if (!targetm
.fixed_point_supported_p ())
9169 "fixed-point types not supported for this target");
9170 pedwarn (loc
, OPT_pedantic
,
9171 "ISO C does not support fixed-point types");
9174 /* ObjC reserved word "id", handled below. */
9180 /* Now we have a typedef (a TYPE_DECL node), an identifier (some
9181 form of ObjC type, cases such as "int" and "long" being handled
9182 above), a TYPE (struct, union, enum and typeof specifiers) or an
9183 ERROR_MARK. In none of these cases may there have previously
9184 been any type specifiers. */
9185 if (specs
->type
|| specs
->typespec_word
!= cts_none
9186 || specs
->long_p
|| specs
->short_p
|| specs
->signed_p
9187 || specs
->unsigned_p
|| specs
->complex_p
)
9188 error_at (loc
, "two or more data types in declaration specifiers");
9189 else if (TREE_CODE (type
) == TYPE_DECL
)
9191 if (TREE_TYPE (type
) == error_mark_node
)
9192 ; /* Allow the type to default to int to avoid cascading errors. */
9195 specs
->type
= TREE_TYPE (type
);
9196 specs
->decl_attr
= DECL_ATTRIBUTES (type
);
9197 specs
->typedef_p
= true;
9198 specs
->explicit_signed_p
= C_TYPEDEF_EXPLICITLY_SIGNED (type
);
9200 /* If this typedef name is defined in a struct, then a C++
9201 lookup would return a different value. */
9203 && I_SYMBOL_BINDING (DECL_NAME (type
))->in_struct
)
9204 warning_at (loc
, OPT_Wc___compat
,
9205 "C++ lookup of %qD would return a field, not a type",
9208 /* If we are parsing a struct, record that a struct field
9210 if (warn_cxx_compat
&& struct_parse_info
!= NULL
)
9211 VEC_safe_push (tree
, heap
, struct_parse_info
->typedefs_seen
, type
);
9214 else if (TREE_CODE (type
) == IDENTIFIER_NODE
)
9216 tree t
= lookup_name (type
);
9217 if (!t
|| TREE_CODE (t
) != TYPE_DECL
)
9218 error_at (loc
, "%qE fails to be a typedef or built in type", type
);
9219 else if (TREE_TYPE (t
) == error_mark_node
)
9222 specs
->type
= TREE_TYPE (t
);
9224 else if (TREE_CODE (type
) != ERROR_MARK
)
9226 if (spec
.kind
== ctsk_tagdef
|| spec
.kind
== ctsk_tagfirstref
)
9227 specs
->tag_defined_p
= true;
9228 if (spec
.kind
== ctsk_typeof
)
9230 specs
->typedef_p
= true;
9234 specs
->expr
= build2 (COMPOUND_EXPR
, TREE_TYPE (spec
.expr
),
9235 specs
->expr
, spec
.expr
);
9237 specs
->expr
= spec
.expr
;
9238 specs
->expr_const_operands
&= spec
.expr_const_operands
;
9247 /* Add the storage class specifier or function specifier SCSPEC to the
9248 declaration specifiers SPECS, returning SPECS. */
9250 struct c_declspecs
*
9251 declspecs_add_scspec (struct c_declspecs
*specs
, tree scspec
)
9254 enum c_storage_class n
= csc_none
;
9256 specs
->declspecs_seen_p
= true;
9257 gcc_assert (TREE_CODE (scspec
) == IDENTIFIER_NODE
9258 && C_IS_RESERVED_WORD (scspec
));
9259 i
= C_RID_CODE (scspec
);
9260 if (specs
->non_sc_seen_p
)
9261 warning (OPT_Wold_style_declaration
,
9262 "%qE is not at beginning of declaration", scspec
);
9266 /* C99 permits duplicate inline. Although of doubtful utility,
9267 it seems simplest to permit it in gnu89 mode as well, as
9268 there is also little utility in maintaining this as a
9269 difference between gnu89 and C99 inline. */
9271 specs
->inline_p
= true;
9274 dupe
= specs
->thread_p
;
9275 if (specs
->storage_class
== csc_auto
)
9276 error ("%<__thread%> used with %<auto%>");
9277 else if (specs
->storage_class
== csc_register
)
9278 error ("%<__thread%> used with %<register%>");
9279 else if (specs
->storage_class
== csc_typedef
)
9280 error ("%<__thread%> used with %<typedef%>");
9282 specs
->thread_p
= true;
9289 /* Diagnose "__thread extern". */
9290 if (specs
->thread_p
)
9291 error ("%<__thread%> before %<extern%>");
9298 /* Diagnose "__thread static". */
9299 if (specs
->thread_p
)
9300 error ("%<__thread%> before %<static%>");
9308 if (n
!= csc_none
&& n
== specs
->storage_class
)
9311 error ("duplicate %qE", scspec
);
9314 if (specs
->storage_class
!= csc_none
&& n
!= specs
->storage_class
)
9316 error ("multiple storage classes in declaration specifiers");
9320 specs
->storage_class
= n
;
9321 if (n
!= csc_extern
&& n
!= csc_static
&& specs
->thread_p
)
9323 error ("%<__thread%> used with %qE", scspec
);
9324 specs
->thread_p
= false;
9331 /* Add the attributes ATTRS to the declaration specifiers SPECS,
9334 struct c_declspecs
*
9335 declspecs_add_attrs (struct c_declspecs
*specs
, tree attrs
)
9337 specs
->attrs
= chainon (attrs
, specs
->attrs
);
9338 specs
->declspecs_seen_p
= true;
9342 /* Combine "long", "short", "signed", "unsigned" and "_Complex" type
9343 specifiers with any other type specifier to determine the resulting
9344 type. This is where ISO C checks on complex types are made, since
9345 "_Complex long" is a prefix of the valid ISO C type "_Complex long
9348 struct c_declspecs
*
9349 finish_declspecs (struct c_declspecs
*specs
)
9351 /* If a type was specified as a whole, we have no modifiers and are
9353 if (specs
->type
!= NULL_TREE
)
9355 gcc_assert (!specs
->long_p
&& !specs
->long_long_p
&& !specs
->short_p
9356 && !specs
->signed_p
&& !specs
->unsigned_p
9357 && !specs
->complex_p
);
9361 /* If none of "void", "_Bool", "char", "int", "float" or "double"
9362 has been specified, treat it as "int" unless "_Complex" is
9363 present and there are no other specifiers. If we just have
9364 "_Complex", it is equivalent to "_Complex double", but e.g.
9365 "_Complex short" is equivalent to "_Complex short int". */
9366 if (specs
->typespec_word
== cts_none
)
9368 if (specs
->saturating_p
)
9370 error ("%<_Sat%> is used without %<_Fract%> or %<_Accum%>");
9371 if (!targetm
.fixed_point_supported_p ())
9372 error ("fixed-point types not supported for this target");
9373 specs
->typespec_word
= cts_fract
;
9375 else if (specs
->long_p
|| specs
->short_p
9376 || specs
->signed_p
|| specs
->unsigned_p
)
9378 specs
->typespec_word
= cts_int
;
9380 else if (specs
->complex_p
)
9382 specs
->typespec_word
= cts_double
;
9383 pedwarn (input_location
, OPT_pedantic
,
9384 "ISO C does not support plain %<complex%> meaning "
9385 "%<double complex%>");
9389 specs
->typespec_word
= cts_int
;
9390 specs
->default_int_p
= true;
9391 /* We don't diagnose this here because grokdeclarator will
9392 give more specific diagnostics according to whether it is
9393 a function definition. */
9397 /* If "signed" was specified, record this to distinguish "int" and
9398 "signed int" in the case of a bit-field with
9399 -funsigned-bitfields. */
9400 specs
->explicit_signed_p
= specs
->signed_p
;
9402 /* Now compute the actual type. */
9403 switch (specs
->typespec_word
)
9406 gcc_assert (!specs
->long_p
&& !specs
->short_p
9407 && !specs
->signed_p
&& !specs
->unsigned_p
9408 && !specs
->complex_p
);
9409 specs
->type
= void_type_node
;
9412 gcc_assert (!specs
->long_p
&& !specs
->short_p
9413 && !specs
->signed_p
&& !specs
->unsigned_p
9414 && !specs
->complex_p
);
9415 specs
->type
= boolean_type_node
;
9418 gcc_assert (!specs
->long_p
&& !specs
->short_p
);
9419 gcc_assert (!(specs
->signed_p
&& specs
->unsigned_p
));
9420 if (specs
->signed_p
)
9421 specs
->type
= signed_char_type_node
;
9422 else if (specs
->unsigned_p
)
9423 specs
->type
= unsigned_char_type_node
;
9425 specs
->type
= char_type_node
;
9426 if (specs
->complex_p
)
9428 pedwarn (input_location
, OPT_pedantic
,
9429 "ISO C does not support complex integer types");
9430 specs
->type
= build_complex_type (specs
->type
);
9434 gcc_assert (!specs
->long_p
&& !specs
->short_p
&& !specs
->long_long_p
);
9435 gcc_assert (!(specs
->signed_p
&& specs
->unsigned_p
));
9436 specs
->type
= (specs
->unsigned_p
9437 ? int128_unsigned_type_node
9438 : int128_integer_type_node
);
9439 if (specs
->complex_p
)
9441 pedwarn (input_location
, OPT_pedantic
,
9442 "ISO C does not support complex integer types");
9443 specs
->type
= build_complex_type (specs
->type
);
9447 gcc_assert (!(specs
->long_p
&& specs
->short_p
));
9448 gcc_assert (!(specs
->signed_p
&& specs
->unsigned_p
));
9449 if (specs
->long_long_p
)
9450 specs
->type
= (specs
->unsigned_p
9451 ? long_long_unsigned_type_node
9452 : long_long_integer_type_node
);
9453 else if (specs
->long_p
)
9454 specs
->type
= (specs
->unsigned_p
9455 ? long_unsigned_type_node
9456 : long_integer_type_node
);
9457 else if (specs
->short_p
)
9458 specs
->type
= (specs
->unsigned_p
9459 ? short_unsigned_type_node
9460 : short_integer_type_node
);
9462 specs
->type
= (specs
->unsigned_p
9463 ? unsigned_type_node
9464 : integer_type_node
);
9465 if (specs
->complex_p
)
9467 pedwarn (input_location
, OPT_pedantic
,
9468 "ISO C does not support complex integer types");
9469 specs
->type
= build_complex_type (specs
->type
);
9473 gcc_assert (!specs
->long_p
&& !specs
->short_p
9474 && !specs
->signed_p
&& !specs
->unsigned_p
);
9475 specs
->type
= (specs
->complex_p
9476 ? complex_float_type_node
9480 gcc_assert (!specs
->long_long_p
&& !specs
->short_p
9481 && !specs
->signed_p
&& !specs
->unsigned_p
);
9484 specs
->type
= (specs
->complex_p
9485 ? complex_long_double_type_node
9486 : long_double_type_node
);
9490 specs
->type
= (specs
->complex_p
9491 ? complex_double_type_node
9492 : double_type_node
);
9498 gcc_assert (!specs
->long_p
&& !specs
->long_long_p
&& !specs
->short_p
9499 && !specs
->signed_p
&& !specs
->unsigned_p
&& !specs
->complex_p
);
9500 if (specs
->typespec_word
== cts_dfloat32
)
9501 specs
->type
= dfloat32_type_node
;
9502 else if (specs
->typespec_word
== cts_dfloat64
)
9503 specs
->type
= dfloat64_type_node
;
9505 specs
->type
= dfloat128_type_node
;
9508 gcc_assert (!specs
->complex_p
);
9509 if (!targetm
.fixed_point_supported_p ())
9510 specs
->type
= integer_type_node
;
9511 else if (specs
->saturating_p
)
9513 if (specs
->long_long_p
)
9514 specs
->type
= specs
->unsigned_p
9515 ? sat_unsigned_long_long_fract_type_node
9516 : sat_long_long_fract_type_node
;
9517 else if (specs
->long_p
)
9518 specs
->type
= specs
->unsigned_p
9519 ? sat_unsigned_long_fract_type_node
9520 : sat_long_fract_type_node
;
9521 else if (specs
->short_p
)
9522 specs
->type
= specs
->unsigned_p
9523 ? sat_unsigned_short_fract_type_node
9524 : sat_short_fract_type_node
;
9526 specs
->type
= specs
->unsigned_p
9527 ? sat_unsigned_fract_type_node
9528 : sat_fract_type_node
;
9532 if (specs
->long_long_p
)
9533 specs
->type
= specs
->unsigned_p
9534 ? unsigned_long_long_fract_type_node
9535 : long_long_fract_type_node
;
9536 else if (specs
->long_p
)
9537 specs
->type
= specs
->unsigned_p
9538 ? unsigned_long_fract_type_node
9539 : long_fract_type_node
;
9540 else if (specs
->short_p
)
9541 specs
->type
= specs
->unsigned_p
9542 ? unsigned_short_fract_type_node
9543 : short_fract_type_node
;
9545 specs
->type
= specs
->unsigned_p
9546 ? unsigned_fract_type_node
9551 gcc_assert (!specs
->complex_p
);
9552 if (!targetm
.fixed_point_supported_p ())
9553 specs
->type
= integer_type_node
;
9554 else if (specs
->saturating_p
)
9556 if (specs
->long_long_p
)
9557 specs
->type
= specs
->unsigned_p
9558 ? sat_unsigned_long_long_accum_type_node
9559 : sat_long_long_accum_type_node
;
9560 else if (specs
->long_p
)
9561 specs
->type
= specs
->unsigned_p
9562 ? sat_unsigned_long_accum_type_node
9563 : sat_long_accum_type_node
;
9564 else if (specs
->short_p
)
9565 specs
->type
= specs
->unsigned_p
9566 ? sat_unsigned_short_accum_type_node
9567 : sat_short_accum_type_node
;
9569 specs
->type
= specs
->unsigned_p
9570 ? sat_unsigned_accum_type_node
9571 : sat_accum_type_node
;
9575 if (specs
->long_long_p
)
9576 specs
->type
= specs
->unsigned_p
9577 ? unsigned_long_long_accum_type_node
9578 : long_long_accum_type_node
;
9579 else if (specs
->long_p
)
9580 specs
->type
= specs
->unsigned_p
9581 ? unsigned_long_accum_type_node
9582 : long_accum_type_node
;
9583 else if (specs
->short_p
)
9584 specs
->type
= specs
->unsigned_p
9585 ? unsigned_short_accum_type_node
9586 : short_accum_type_node
;
9588 specs
->type
= specs
->unsigned_p
9589 ? unsigned_accum_type_node
9600 /* A subroutine of c_write_global_declarations. Perform final processing
9601 on one file scope's declarations (or the external scope's declarations),
9605 c_write_global_declarations_1 (tree globals
)
9610 /* Process the decls in the order they were written. */
9611 for (decl
= globals
; decl
; decl
= DECL_CHAIN (decl
))
9613 /* Check for used but undefined static functions using the C
9614 standard's definition of "used", and set TREE_NO_WARNING so
9615 that check_global_declarations doesn't repeat the check. */
9616 if (TREE_CODE (decl
) == FUNCTION_DECL
9617 && DECL_INITIAL (decl
) == 0
9618 && DECL_EXTERNAL (decl
)
9619 && !TREE_PUBLIC (decl
)
9620 && C_DECL_USED (decl
))
9622 pedwarn (input_location
, 0, "%q+F used but never defined", decl
);
9623 TREE_NO_WARNING (decl
) = 1;
9626 wrapup_global_declaration_1 (decl
);
9632 for (decl
= globals
; decl
; decl
= DECL_CHAIN (decl
))
9633 reconsider
|= wrapup_global_declaration_2 (decl
);
9637 for (decl
= globals
; decl
; decl
= DECL_CHAIN (decl
))
9638 check_global_declaration_1 (decl
);
9641 /* A subroutine of c_write_global_declarations Emit debug information for each
9642 of the declarations in GLOBALS. */
9645 c_write_global_declarations_2 (tree globals
)
9649 for (decl
= globals
; decl
; decl
= DECL_CHAIN (decl
))
9650 debug_hooks
->global_decl (decl
);
9653 /* Callback to collect a source_ref from a DECL. */
9656 collect_source_ref_cb (tree decl
)
9658 if (!DECL_IS_BUILTIN (decl
))
9659 collect_source_ref (LOCATION_FILE (decl_sloc (decl
, false)));
9662 /* Collect all references relevant to SOURCE_FILE. */
9665 collect_all_refs (const char *source_file
)
9670 FOR_EACH_VEC_ELT (tree
, all_translation_units
, i
, t
)
9671 collect_ada_nodes (BLOCK_VARS (DECL_INITIAL (t
)), source_file
);
9674 /* Iterate over all global declarations and call CALLBACK. */
9677 for_each_global_decl (void (*callback
) (tree decl
))
9684 FOR_EACH_VEC_ELT (tree
, all_translation_units
, i
, t
)
9686 decls
= DECL_INITIAL (t
);
9687 for (decl
= BLOCK_VARS (decls
); decl
; decl
= TREE_CHAIN (decl
))
9692 /* Preserve the external declarations scope across a garbage collect. */
9693 static GTY(()) tree ext_block
;
9696 c_write_global_declarations (void)
9701 /* We don't want to do this if generating a PCH. */
9705 /* Close the external scope. */
9706 ext_block
= pop_scope ();
9708 gcc_assert (!current_scope
);
9710 /* Handle -fdump-ada-spec[-slim]. */
9711 if (dump_enabled_p (TDI_ada
))
9713 /* Build a table of files to generate specs for */
9714 if (get_dump_file_info (TDI_ada
)->flags
& TDF_SLIM
)
9715 collect_source_ref (main_input_filename
);
9717 for_each_global_decl (collect_source_ref_cb
);
9719 dump_ada_specs (collect_all_refs
, NULL
);
9724 tree tmp
= BLOCK_VARS (ext_block
);
9726 FILE * stream
= dump_begin (TDI_tu
, &flags
);
9729 dump_node (tmp
, flags
& ~TDF_SLIM
, stream
);
9730 dump_end (TDI_tu
, stream
);
9734 /* Process all file scopes in this compilation, and the external_scope,
9735 through wrapup_global_declarations and check_global_declarations. */
9736 FOR_EACH_VEC_ELT (tree
, all_translation_units
, i
, t
)
9737 c_write_global_declarations_1 (BLOCK_VARS (DECL_INITIAL (t
)));
9738 c_write_global_declarations_1 (BLOCK_VARS (ext_block
));
9740 /* We're done parsing; proceed to optimize and emit assembly.
9741 FIXME: shouldn't be the front end's responsibility to call this. */
9742 cgraph_finalize_compilation_unit ();
9744 /* After cgraph has had a chance to emit everything that's going to
9745 be emitted, output debug information for globals. */
9748 timevar_push (TV_SYMOUT
);
9749 FOR_EACH_VEC_ELT (tree
, all_translation_units
, i
, t
)
9750 c_write_global_declarations_2 (BLOCK_VARS (DECL_INITIAL (t
)));
9751 c_write_global_declarations_2 (BLOCK_VARS (ext_block
));
9752 timevar_pop (TV_SYMOUT
);
9758 /* Register reserved keyword WORD as qualifier for address space AS. */
9761 c_register_addr_space (const char *word
, addr_space_t as
)
9763 int rid
= RID_FIRST_ADDR_SPACE
+ as
;
9766 /* Address space qualifiers are only supported
9767 in C with GNU extensions enabled. */
9768 if (c_dialect_objc () || flag_no_asm
)
9771 id
= get_identifier (word
);
9772 C_SET_RID_CODE (id
, rid
);
9773 C_IS_RESERVED_WORD (id
) = 1;
9774 ridpointers
[rid
] = id
;
9777 #include "gt-c-decl.h"