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 if (c_dialect_objc ()
4076 && (TREE_CODE (decl
) == VAR_DECL
4077 || TREE_CODE (decl
) == FUNCTION_DECL
))
4078 objc_check_global_decl (decl
);
4080 /* Add this decl to the current scope.
4081 TEM may equal DECL or it may be a previous decl of the same name. */
4082 tem
= pushdecl (decl
);
4084 if (initialized
&& DECL_EXTERNAL (tem
))
4086 DECL_EXTERNAL (tem
) = 0;
4087 TREE_STATIC (tem
) = 1;
4093 /* Subroutine of finish_decl. TYPE is the type of an uninitialized object
4094 DECL or the non-array element type if DECL is an uninitialized array.
4095 If that type has a const member, diagnose this. */
4098 diagnose_uninitialized_cst_member (tree decl
, tree type
)
4101 for (field
= TYPE_FIELDS (type
); field
; field
= TREE_CHAIN (field
))
4104 if (TREE_CODE (field
) != FIELD_DECL
)
4106 field_type
= strip_array_types (TREE_TYPE (field
));
4108 if (TYPE_QUALS (field_type
) & TYPE_QUAL_CONST
)
4110 warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wc___compat
,
4111 "uninitialized const member in %qT is invalid in C++",
4112 strip_array_types (TREE_TYPE (decl
)));
4113 inform (DECL_SOURCE_LOCATION (field
), "%qD should be initialized", field
);
4116 if (TREE_CODE (field_type
) == RECORD_TYPE
4117 || TREE_CODE (field_type
) == UNION_TYPE
)
4118 diagnose_uninitialized_cst_member (decl
, field_type
);
4122 /* Finish processing of a declaration;
4123 install its initial value.
4124 If ORIGTYPE is not NULL_TREE, it is the original type of INIT.
4125 If the length of an array type is not known before,
4126 it must be determined now, from the initial value, or it is an error.
4128 INIT_LOC is the location of the initial value. */
4131 finish_decl (tree decl
, location_t init_loc
, tree init
,
4132 tree origtype
, tree asmspec_tree
)
4135 bool was_incomplete
= (DECL_SIZE (decl
) == 0);
4136 const char *asmspec
= 0;
4138 /* If a name was specified, get the string. */
4139 if ((TREE_CODE (decl
) == FUNCTION_DECL
|| TREE_CODE (decl
) == VAR_DECL
)
4140 && DECL_FILE_SCOPE_P (decl
))
4141 asmspec_tree
= maybe_apply_renaming_pragma (decl
, asmspec_tree
);
4143 asmspec
= TREE_STRING_POINTER (asmspec_tree
);
4145 if (TREE_CODE (decl
) == VAR_DECL
4146 && TREE_STATIC (decl
)
4147 && global_bindings_p ())
4148 /* So decl is a global variable. Record the types it uses
4149 so that we can decide later to emit debug info for them. */
4150 record_types_used_by_current_var_decl (decl
);
4152 /* If `start_decl' didn't like having an initialization, ignore it now. */
4153 if (init
!= 0 && DECL_INITIAL (decl
) == 0)
4156 /* Don't crash if parm is initialized. */
4157 if (TREE_CODE (decl
) == PARM_DECL
)
4161 store_init_value (init_loc
, decl
, init
, origtype
);
4163 if (c_dialect_objc () && (TREE_CODE (decl
) == VAR_DECL
4164 || TREE_CODE (decl
) == FUNCTION_DECL
4165 || TREE_CODE (decl
) == FIELD_DECL
))
4166 objc_check_decl (decl
);
4168 type
= TREE_TYPE (decl
);
4170 /* Deduce size of array from initialization, if not already known. */
4171 if (TREE_CODE (type
) == ARRAY_TYPE
4172 && TYPE_DOMAIN (type
) == 0
4173 && TREE_CODE (decl
) != TYPE_DECL
)
4176 = (TREE_STATIC (decl
)
4177 /* Even if pedantic, an external linkage array
4178 may have incomplete type at first. */
4179 ? pedantic
&& !TREE_PUBLIC (decl
)
4180 : !DECL_EXTERNAL (decl
));
4182 = complete_array_type (&TREE_TYPE (decl
), DECL_INITIAL (decl
),
4185 /* Get the completed type made by complete_array_type. */
4186 type
= TREE_TYPE (decl
);
4191 error ("initializer fails to determine size of %q+D", decl
);
4196 error ("array size missing in %q+D", decl
);
4197 /* If a `static' var's size isn't known,
4198 make it extern as well as static, so it does not get
4200 If it is not `static', then do not mark extern;
4201 finish_incomplete_decl will give it a default size
4202 and it will get allocated. */
4203 else if (!pedantic
&& TREE_STATIC (decl
) && !TREE_PUBLIC (decl
))
4204 DECL_EXTERNAL (decl
) = 1;
4208 error ("zero or negative size array %q+D", decl
);
4212 /* For global variables, update the copy of the type that
4213 exists in the binding. */
4214 if (TREE_PUBLIC (decl
))
4216 struct c_binding
*b_ext
= I_SYMBOL_BINDING (DECL_NAME (decl
));
4217 while (b_ext
&& !B_IN_EXTERNAL_SCOPE (b_ext
))
4218 b_ext
= b_ext
->shadowed
;
4222 b_ext
->u
.type
= composite_type (b_ext
->u
.type
, type
);
4224 b_ext
->u
.type
= type
;
4233 if (DECL_INITIAL (decl
))
4234 TREE_TYPE (DECL_INITIAL (decl
)) = type
;
4236 layout_decl (decl
, 0);
4239 if (TREE_CODE (decl
) == VAR_DECL
)
4241 if (init
&& TREE_CODE (init
) == CONSTRUCTOR
)
4242 add_flexible_array_elts_to_size (decl
, init
);
4244 if (DECL_SIZE (decl
) == 0 && TREE_TYPE (decl
) != error_mark_node
4245 && COMPLETE_TYPE_P (TREE_TYPE (decl
)))
4246 layout_decl (decl
, 0);
4248 if (DECL_SIZE (decl
) == 0
4249 /* Don't give an error if we already gave one earlier. */
4250 && TREE_TYPE (decl
) != error_mark_node
4251 && (TREE_STATIC (decl
)
4252 /* A static variable with an incomplete type
4253 is an error if it is initialized.
4254 Also if it is not file scope.
4255 Otherwise, let it through, but if it is not `extern'
4256 then it may cause an error message later. */
4257 ? (DECL_INITIAL (decl
) != 0
4258 || !DECL_FILE_SCOPE_P (decl
))
4259 /* An automatic variable with an incomplete type
4261 : !DECL_EXTERNAL (decl
)))
4263 error ("storage size of %q+D isn%'t known", decl
);
4264 TREE_TYPE (decl
) = error_mark_node
;
4267 if ((DECL_EXTERNAL (decl
) || TREE_STATIC (decl
))
4268 && DECL_SIZE (decl
) != 0)
4270 if (TREE_CODE (DECL_SIZE (decl
)) == INTEGER_CST
)
4271 constant_expression_warning (DECL_SIZE (decl
));
4274 error ("storage size of %q+D isn%'t constant", decl
);
4275 TREE_TYPE (decl
) = error_mark_node
;
4279 if (TREE_USED (type
))
4281 TREE_USED (decl
) = 1;
4282 DECL_READ_P (decl
) = 1;
4286 /* If this is a function and an assembler name is specified, reset DECL_RTL
4287 so we can give it its new name. Also, update built_in_decls if it
4288 was a normal built-in. */
4289 if (TREE_CODE (decl
) == FUNCTION_DECL
&& asmspec
)
4291 if (DECL_BUILT_IN_CLASS (decl
) == BUILT_IN_NORMAL
)
4292 set_builtin_user_assembler_name (decl
, asmspec
);
4293 set_user_assembler_name (decl
, asmspec
);
4296 /* If #pragma weak was used, mark the decl weak now. */
4297 maybe_apply_pragma_weak (decl
);
4299 /* Output the assembler code and/or RTL code for variables and functions,
4300 unless the type is an undefined structure or union.
4301 If not, it will get done when the type is completed. */
4303 if (TREE_CODE (decl
) == VAR_DECL
|| TREE_CODE (decl
) == FUNCTION_DECL
)
4305 /* Determine the ELF visibility. */
4306 if (TREE_PUBLIC (decl
))
4307 c_determine_visibility (decl
);
4309 /* This is a no-op in c-lang.c or something real in objc-act.c. */
4310 if (c_dialect_objc ())
4311 objc_check_decl (decl
);
4315 /* If this is not a static variable, issue a warning.
4316 It doesn't make any sense to give an ASMSPEC for an
4317 ordinary, non-register local variable. Historically,
4318 GCC has accepted -- but ignored -- the ASMSPEC in
4320 if (!DECL_FILE_SCOPE_P (decl
)
4321 && TREE_CODE (decl
) == VAR_DECL
4322 && !C_DECL_REGISTER (decl
)
4323 && !TREE_STATIC (decl
))
4324 warning (0, "ignoring asm-specifier for non-static local "
4325 "variable %q+D", decl
);
4327 set_user_assembler_name (decl
, asmspec
);
4330 if (DECL_FILE_SCOPE_P (decl
))
4332 if (DECL_INITIAL (decl
) == NULL_TREE
4333 || DECL_INITIAL (decl
) == error_mark_node
)
4334 /* Don't output anything
4335 when a tentative file-scope definition is seen.
4336 But at end of compilation, do output code for them. */
4337 DECL_DEFER_OUTPUT (decl
) = 1;
4338 rest_of_decl_compilation (decl
, true, 0);
4342 /* In conjunction with an ASMSPEC, the `register'
4343 keyword indicates that we should place the variable
4344 in a particular register. */
4345 if (asmspec
&& C_DECL_REGISTER (decl
))
4347 DECL_HARD_REGISTER (decl
) = 1;
4348 /* This cannot be done for a structure with volatile
4349 fields, on which DECL_REGISTER will have been
4351 if (!DECL_REGISTER (decl
))
4352 error ("cannot put object with volatile field into register");
4355 if (TREE_CODE (decl
) != FUNCTION_DECL
)
4357 /* If we're building a variable sized type, and we might be
4358 reachable other than via the top of the current binding
4359 level, then create a new BIND_EXPR so that we deallocate
4360 the object at the right time. */
4361 /* Note that DECL_SIZE can be null due to errors. */
4362 if (DECL_SIZE (decl
)
4363 && !TREE_CONSTANT (DECL_SIZE (decl
))
4364 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list
))
4367 bind
= build3 (BIND_EXPR
, void_type_node
, NULL
, NULL
, NULL
);
4368 TREE_SIDE_EFFECTS (bind
) = 1;
4370 BIND_EXPR_BODY (bind
) = push_stmt_list ();
4372 add_stmt (build_stmt (DECL_SOURCE_LOCATION (decl
),
4378 if (!DECL_FILE_SCOPE_P (decl
))
4380 /* Recompute the RTL of a local array now
4381 if it used to be an incomplete type. */
4383 && !TREE_STATIC (decl
) && !DECL_EXTERNAL (decl
))
4385 /* If we used it already as memory, it must stay in memory. */
4386 TREE_ADDRESSABLE (decl
) = TREE_USED (decl
);
4387 /* If it's still incomplete now, no init will save it. */
4388 if (DECL_SIZE (decl
) == 0)
4389 DECL_INITIAL (decl
) = 0;
4394 if (TREE_CODE (decl
) == TYPE_DECL
)
4396 if (!DECL_FILE_SCOPE_P (decl
)
4397 && variably_modified_type_p (TREE_TYPE (decl
), NULL_TREE
))
4398 add_stmt (build_stmt (DECL_SOURCE_LOCATION (decl
), DECL_EXPR
, decl
));
4400 rest_of_decl_compilation (decl
, DECL_FILE_SCOPE_P (decl
), 0);
4403 /* At the end of a declaration, throw away any variable type sizes
4404 of types defined inside that declaration. There is no use
4405 computing them in the following function definition. */
4406 if (current_scope
== file_scope
)
4407 get_pending_sizes ();
4409 /* Install a cleanup (aka destructor) if one was given. */
4410 if (TREE_CODE (decl
) == VAR_DECL
&& !TREE_STATIC (decl
))
4412 tree attr
= lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl
));
4415 tree cleanup_id
= TREE_VALUE (TREE_VALUE (attr
));
4416 tree cleanup_decl
= lookup_name (cleanup_id
);
4420 /* Build "cleanup(&decl)" for the destructor. */
4421 cleanup
= build_unary_op (input_location
, ADDR_EXPR
, decl
, 0);
4422 vec
= VEC_alloc (tree
, gc
, 1);
4423 VEC_quick_push (tree
, vec
, cleanup
);
4424 cleanup
= build_function_call_vec (DECL_SOURCE_LOCATION (decl
),
4425 cleanup_decl
, vec
, NULL
);
4426 VEC_free (tree
, gc
, vec
);
4428 /* Don't warn about decl unused; the cleanup uses it. */
4429 TREE_USED (decl
) = 1;
4430 TREE_USED (cleanup_decl
) = 1;
4431 DECL_READ_P (decl
) = 1;
4433 push_cleanup (decl
, cleanup
, false);
4438 && TREE_CODE (decl
) == VAR_DECL
4439 && !DECL_EXTERNAL (decl
)
4440 && DECL_INITIAL (decl
) == NULL_TREE
)
4442 type
= strip_array_types (type
);
4443 if (TREE_READONLY (decl
))
4444 warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wc___compat
,
4445 "uninitialized const %qD is invalid in C++", decl
);
4446 else if ((TREE_CODE (type
) == RECORD_TYPE
4447 || TREE_CODE (type
) == UNION_TYPE
)
4448 && C_TYPE_FIELDS_READONLY (type
))
4449 diagnose_uninitialized_cst_member (decl
, type
);
4453 /* Given a parsed parameter declaration, decode it into a PARM_DECL. */
4456 grokparm (const struct c_parm
*parm
)
4458 tree attrs
= parm
->attrs
;
4459 tree decl
= grokdeclarator (parm
->declarator
, parm
->specs
, PARM
, false,
4460 NULL
, &attrs
, NULL
, NULL
, DEPRECATED_NORMAL
);
4462 decl_attributes (&decl
, attrs
, 0);
4467 /* Given a parsed parameter declaration, decode it into a PARM_DECL
4468 and push that on the current scope. */
4471 push_parm_decl (const struct c_parm
*parm
)
4473 tree attrs
= parm
->attrs
;
4476 decl
= grokdeclarator (parm
->declarator
, parm
->specs
, PARM
, false, NULL
,
4477 &attrs
, NULL
, NULL
, DEPRECATED_NORMAL
);
4478 decl_attributes (&decl
, attrs
, 0);
4480 decl
= pushdecl (decl
);
4482 finish_decl (decl
, input_location
, NULL_TREE
, NULL_TREE
, NULL_TREE
);
4485 /* Mark all the parameter declarations to date as forward decls.
4486 Also diagnose use of this extension. */
4489 mark_forward_parm_decls (void)
4491 struct c_binding
*b
;
4493 if (pedantic
&& !current_scope
->warned_forward_parm_decls
)
4495 pedwarn (input_location
, OPT_pedantic
,
4496 "ISO C forbids forward parameter declarations");
4497 current_scope
->warned_forward_parm_decls
= true;
4500 for (b
= current_scope
->bindings
; b
; b
= b
->prev
)
4501 if (TREE_CODE (b
->decl
) == PARM_DECL
)
4502 TREE_ASM_WRITTEN (b
->decl
) = 1;
4505 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
4506 literal, which may be an incomplete array type completed by the
4507 initializer; INIT is a CONSTRUCTOR at LOC that initializes the compound
4508 literal. NON_CONST is true if the initializers contain something
4509 that cannot occur in a constant expression. */
4512 build_compound_literal (location_t loc
, tree type
, tree init
, bool non_const
)
4514 /* We do not use start_decl here because we have a type, not a declarator;
4515 and do not use finish_decl because the decl should be stored inside
4516 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_EXPR. */
4521 if (type
== error_mark_node
4522 || init
== error_mark_node
)
4523 return error_mark_node
;
4525 decl
= build_decl (loc
, VAR_DECL
, NULL_TREE
, type
);
4526 DECL_EXTERNAL (decl
) = 0;
4527 TREE_PUBLIC (decl
) = 0;
4528 TREE_STATIC (decl
) = (current_scope
== file_scope
);
4529 DECL_CONTEXT (decl
) = current_function_decl
;
4530 TREE_USED (decl
) = 1;
4531 DECL_READ_P (decl
) = 1;
4532 TREE_TYPE (decl
) = type
;
4533 TREE_READONLY (decl
) = TYPE_READONLY (type
);
4534 store_init_value (loc
, decl
, init
, NULL_TREE
);
4536 if (TREE_CODE (type
) == ARRAY_TYPE
&& !COMPLETE_TYPE_P (type
))
4538 int failure
= complete_array_type (&TREE_TYPE (decl
),
4539 DECL_INITIAL (decl
), true);
4540 gcc_assert (!failure
);
4542 type
= TREE_TYPE (decl
);
4543 TREE_TYPE (DECL_INITIAL (decl
)) = type
;
4546 if (type
== error_mark_node
|| !COMPLETE_TYPE_P (type
))
4547 return error_mark_node
;
4549 stmt
= build_stmt (DECL_SOURCE_LOCATION (decl
), DECL_EXPR
, decl
);
4550 complit
= build1 (COMPOUND_LITERAL_EXPR
, type
, stmt
);
4551 TREE_SIDE_EFFECTS (complit
) = 1;
4553 layout_decl (decl
, 0);
4555 if (TREE_STATIC (decl
))
4557 /* This decl needs a name for the assembler output. */
4558 set_compound_literal_name (decl
);
4559 DECL_DEFER_OUTPUT (decl
) = 1;
4560 DECL_COMDAT (decl
) = 1;
4561 DECL_ARTIFICIAL (decl
) = 1;
4562 DECL_IGNORED_P (decl
) = 1;
4564 rest_of_decl_compilation (decl
, 1, 0);
4569 complit
= build2 (C_MAYBE_CONST_EXPR
, type
, NULL
, complit
);
4570 C_MAYBE_CONST_EXPR_NON_CONST (complit
) = 1;
4576 /* Check the type of a compound literal. Here we just check that it
4577 is valid for C++. */
4580 check_compound_literal_type (location_t loc
, struct c_type_name
*type_name
)
4582 if (warn_cxx_compat
&& type_name
->specs
->tag_defined_p
)
4583 warning_at (loc
, OPT_Wc___compat
,
4584 "defining a type in a compound literal is invalid in C++");
4587 /* Determine whether TYPE is a structure with a flexible array member,
4588 or a union containing such a structure (possibly recursively). */
4591 flexible_array_type_p (tree type
)
4594 switch (TREE_CODE (type
))
4597 x
= TYPE_FIELDS (type
);
4600 while (DECL_CHAIN (x
) != NULL_TREE
)
4602 if (TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
4603 && TYPE_SIZE (TREE_TYPE (x
)) == NULL_TREE
4604 && TYPE_DOMAIN (TREE_TYPE (x
)) != NULL_TREE
4605 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x
))) == NULL_TREE
)
4609 for (x
= TYPE_FIELDS (type
); x
!= NULL_TREE
; x
= DECL_CHAIN (x
))
4611 if (flexible_array_type_p (TREE_TYPE (x
)))
4620 /* Performs sanity checks on the TYPE and WIDTH of the bit-field NAME,
4621 replacing with appropriate values if they are invalid. */
4623 check_bitfield_type_and_width (tree
*type
, tree
*width
, tree orig_name
)
4626 unsigned int max_width
;
4627 unsigned HOST_WIDE_INT w
;
4628 const char *name
= (orig_name
4629 ? identifier_to_locale (IDENTIFIER_POINTER (orig_name
))
4630 : _("<anonymous>"));
4632 /* Detect and ignore out of range field width and process valid
4634 if (!INTEGRAL_TYPE_P (TREE_TYPE (*width
)))
4636 error ("bit-field %qs width not an integer constant", name
);
4637 *width
= integer_one_node
;
4641 if (TREE_CODE (*width
) != INTEGER_CST
)
4643 *width
= c_fully_fold (*width
, false, NULL
);
4644 if (TREE_CODE (*width
) == INTEGER_CST
)
4645 pedwarn (input_location
, OPT_pedantic
,
4646 "bit-field %qs width not an integer constant expression",
4649 if (TREE_CODE (*width
) != INTEGER_CST
)
4651 error ("bit-field %qs width not an integer constant", name
);
4652 *width
= integer_one_node
;
4654 constant_expression_warning (*width
);
4655 if (tree_int_cst_sgn (*width
) < 0)
4657 error ("negative width in bit-field %qs", name
);
4658 *width
= integer_one_node
;
4660 else if (integer_zerop (*width
) && orig_name
)
4662 error ("zero width for bit-field %qs", name
);
4663 *width
= integer_one_node
;
4667 /* Detect invalid bit-field type. */
4668 if (TREE_CODE (*type
) != INTEGER_TYPE
4669 && TREE_CODE (*type
) != BOOLEAN_TYPE
4670 && TREE_CODE (*type
) != ENUMERAL_TYPE
)
4672 error ("bit-field %qs has invalid type", name
);
4673 *type
= unsigned_type_node
;
4676 type_mv
= TYPE_MAIN_VARIANT (*type
);
4677 if (!in_system_header
4678 && type_mv
!= integer_type_node
4679 && type_mv
!= unsigned_type_node
4680 && type_mv
!= boolean_type_node
)
4681 pedwarn (input_location
, OPT_pedantic
,
4682 "type of bit-field %qs is a GCC extension", name
);
4684 max_width
= TYPE_PRECISION (*type
);
4686 if (0 < compare_tree_int (*width
, max_width
))
4688 error ("width of %qs exceeds its type", name
);
4690 *width
= build_int_cst (NULL_TREE
, w
);
4693 w
= tree_low_cst (*width
, 1);
4695 if (TREE_CODE (*type
) == ENUMERAL_TYPE
)
4697 struct lang_type
*lt
= TYPE_LANG_SPECIFIC (*type
);
4699 || w
< tree_int_cst_min_precision (lt
->enum_min
, TYPE_UNSIGNED (*type
))
4700 || w
< tree_int_cst_min_precision (lt
->enum_max
, TYPE_UNSIGNED (*type
)))
4701 warning (0, "%qs is narrower than values of its type", name
);
4707 /* Print warning about variable length array if necessary. */
4710 warn_variable_length_array (tree name
, tree size
)
4712 int const_size
= TREE_CONSTANT (size
);
4714 if (!flag_isoc99
&& pedantic
&& warn_vla
!= 0)
4719 pedwarn (input_location
, OPT_Wvla
,
4720 "ISO C90 forbids array %qE whose size "
4721 "can%'t be evaluated",
4724 pedwarn (input_location
, OPT_Wvla
, "ISO C90 forbids array whose size "
4725 "can%'t be evaluated");
4730 pedwarn (input_location
, OPT_Wvla
,
4731 "ISO C90 forbids variable length array %qE",
4734 pedwarn (input_location
, OPT_Wvla
, "ISO C90 forbids variable length array");
4737 else if (warn_vla
> 0)
4743 "the size of array %qE can"
4744 "%'t be evaluated", name
);
4747 "the size of array can %'t be evaluated");
4753 "variable length array %qE is used",
4757 "variable length array is used");
4762 /* Given a size SIZE that may not be a constant, return a SAVE_EXPR to
4763 serve as the actual size-expression for a type or decl. This is
4764 like variable_size in stor-layout.c, but we make global_bindings_p
4765 return negative to avoid calls to that function from outside the
4766 front end resulting in errors at file scope, then call this version
4767 instead from front-end code. */
4770 c_variable_size (tree size
)
4774 if (TREE_CONSTANT (size
))
4777 size
= save_expr (size
);
4779 save
= skip_simple_arithmetic (size
);
4781 if (cfun
&& cfun
->dont_save_pending_sizes_p
)
4784 if (!global_bindings_p ())
4785 put_pending_size (save
);
4790 /* Given declspecs and a declarator,
4791 determine the name and type of the object declared
4792 and construct a ..._DECL node for it.
4793 (In one case we can return a ..._TYPE node instead.
4794 For invalid input we sometimes return 0.)
4796 DECLSPECS is a c_declspecs structure for the declaration specifiers.
4798 DECL_CONTEXT says which syntactic context this declaration is in:
4799 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
4800 FUNCDEF for a function definition. Like NORMAL but a few different
4801 error messages in each case. Return value may be zero meaning
4802 this definition is too screwy to try to parse.
4803 PARM for a parameter declaration (either within a function prototype
4804 or before a function body). Make a PARM_DECL, or return void_type_node.
4805 TYPENAME if for a typename (in a cast or sizeof).
4806 Don't make a DECL node; just return the ..._TYPE node.
4807 FIELD for a struct or union field; make a FIELD_DECL.
4808 INITIALIZED is true if the decl has an initializer.
4809 WIDTH is non-NULL for bit-fields, and is a pointer to an INTEGER_CST node
4810 representing the width of the bit-field.
4811 DECL_ATTRS points to the list of attributes that should be added to this
4812 decl. Any nested attributes that belong on the decl itself will be
4814 If EXPR is not NULL, any expressions that need to be evaluated as
4815 part of evaluating variably modified types will be stored in *EXPR.
4816 If EXPR_CONST_OPERANDS is not NULL, *EXPR_CONST_OPERANDS will be
4817 set to indicate whether operands in *EXPR can be used in constant
4819 DEPRECATED_STATE is a deprecated_states value indicating whether
4820 deprecation warnings should be suppressed.
4822 In the TYPENAME case, DECLARATOR is really an absolute declarator.
4823 It may also be so in the PARM case, for a prototype where the
4824 argument type is specified but not the name.
4826 This function is where the complicated C meanings of `static'
4827 and `extern' are interpreted. */
4830 grokdeclarator (const struct c_declarator
*declarator
,
4831 struct c_declspecs
*declspecs
,
4832 enum decl_context decl_context
, bool initialized
, tree
*width
,
4833 tree
*decl_attrs
, tree
*expr
, bool *expr_const_operands
,
4834 enum deprecated_states deprecated_state
)
4836 tree type
= declspecs
->type
;
4837 bool threadp
= declspecs
->thread_p
;
4838 enum c_storage_class storage_class
= declspecs
->storage_class
;
4842 int type_quals
= TYPE_UNQUALIFIED
;
4843 tree name
= NULL_TREE
;
4844 bool funcdef_flag
= false;
4845 bool funcdef_syntax
= false;
4846 bool size_varies
= false;
4847 tree decl_attr
= declspecs
->decl_attr
;
4848 int array_ptr_quals
= TYPE_UNQUALIFIED
;
4849 tree array_ptr_attrs
= NULL_TREE
;
4850 int array_parm_static
= 0;
4851 bool array_parm_vla_unspec_p
= false;
4852 tree returned_attrs
= NULL_TREE
;
4853 bool bitfield
= width
!= NULL
;
4855 struct c_arg_info
*arg_info
= 0;
4856 addr_space_t as1
, as2
, address_space
;
4857 location_t loc
= UNKNOWN_LOCATION
;
4860 bool expr_const_operands_dummy
;
4864 if (expr_const_operands
== NULL
)
4865 expr_const_operands
= &expr_const_operands_dummy
;
4867 *expr
= declspecs
->expr
;
4868 *expr_const_operands
= declspecs
->expr_const_operands
;
4870 if (decl_context
== FUNCDEF
)
4871 funcdef_flag
= true, decl_context
= NORMAL
;
4873 /* Look inside a declarator for the name being declared
4874 and get it as an IDENTIFIER_NODE, for an error message. */
4876 const struct c_declarator
*decl
= declarator
;
4887 funcdef_syntax
= (decl
->kind
== cdk_function
);
4888 decl
= decl
->declarator
;
4892 decl
= decl
->declarator
;
4907 gcc_assert (decl_context
== PARM
4908 || decl_context
== TYPENAME
4909 || (decl_context
== FIELD
4910 && declarator
->kind
== cdk_id
));
4911 gcc_assert (!initialized
);
4915 /* A function definition's declarator must have the form of
4916 a function declarator. */
4918 if (funcdef_flag
&& !funcdef_syntax
)
4921 /* If this looks like a function definition, make it one,
4922 even if it occurs where parms are expected.
4923 Then store_parm_decls will reject it and not use it as a parm. */
4924 if (decl_context
== NORMAL
&& !funcdef_flag
&& current_scope
->parm_flag
)
4925 decl_context
= PARM
;
4927 if (declspecs
->deprecated_p
&& deprecated_state
!= DEPRECATED_SUPPRESS
)
4928 warn_deprecated_use (declspecs
->type
, declspecs
->decl_attr
);
4930 if ((decl_context
== NORMAL
|| decl_context
== FIELD
)
4931 && current_scope
== file_scope
4932 && variably_modified_type_p (type
, NULL_TREE
))
4935 error_at (loc
, "variably modified %qE at file scope", name
);
4937 error_at (loc
, "variably modified field at file scope");
4938 type
= integer_type_node
;
4941 size_varies
= C_TYPE_VARIABLE_SIZE (type
) != 0;
4943 /* Diagnose defaulting to "int". */
4945 if (declspecs
->default_int_p
&& !in_system_header
)
4947 /* Issue a warning if this is an ISO C 99 program or if
4948 -Wreturn-type and this is a function, or if -Wimplicit;
4949 prefer the former warning since it is more explicit. */
4950 if ((warn_implicit_int
|| warn_return_type
|| flag_isoc99
)
4952 warn_about_return_type
= 1;
4956 pedwarn_c99 (loc
, flag_isoc99
? 0 : OPT_Wimplicit_int
,
4957 "type defaults to %<int%> in declaration of %qE",
4960 pedwarn_c99 (input_location
, flag_isoc99
? 0 : OPT_Wimplicit_int
,
4961 "type defaults to %<int%> in type name");
4965 /* Adjust the type if a bit-field is being declared,
4966 -funsigned-bitfields applied and the type is not explicitly
4968 if (bitfield
&& !flag_signed_bitfields
&& !declspecs
->explicit_signed_p
4969 && TREE_CODE (type
) == INTEGER_TYPE
)
4970 type
= unsigned_type_for (type
);
4972 /* Figure out the type qualifiers for the declaration. There are
4973 two ways a declaration can become qualified. One is something
4974 like `const int i' where the `const' is explicit. Another is
4975 something like `typedef const int CI; CI i' where the type of the
4976 declaration contains the `const'. A third possibility is that
4977 there is a type qualifier on the element type of a typedefed
4978 array type, in which case we should extract that qualifier so
4979 that c_apply_type_quals_to_decl receives the full list of
4980 qualifiers to work with (C90 is not entirely clear about whether
4981 duplicate qualifiers should be diagnosed in this case, but it
4982 seems most appropriate to do so). */
4983 element_type
= strip_array_types (type
);
4984 constp
= declspecs
->const_p
+ TYPE_READONLY (element_type
);
4985 restrictp
= declspecs
->restrict_p
+ TYPE_RESTRICT (element_type
);
4986 volatilep
= declspecs
->volatile_p
+ TYPE_VOLATILE (element_type
);
4987 as1
= declspecs
->address_space
;
4988 as2
= TYPE_ADDR_SPACE (element_type
);
4989 address_space
= ADDR_SPACE_GENERIC_P (as1
)? as2
: as1
;
4991 if (pedantic
&& !flag_isoc99
)
4994 pedwarn (loc
, OPT_pedantic
, "duplicate %<const%>");
4996 pedwarn (loc
, OPT_pedantic
, "duplicate %<restrict%>");
4998 pedwarn (loc
, OPT_pedantic
, "duplicate %<volatile%>");
5001 if (!ADDR_SPACE_GENERIC_P (as1
) && !ADDR_SPACE_GENERIC_P (as2
) && as1
!= as2
)
5002 error_at (loc
, "conflicting named address spaces (%s vs %s)",
5003 c_addr_space_name (as1
), c_addr_space_name (as2
));
5005 if (!flag_gen_aux_info
&& (TYPE_QUALS (element_type
)))
5006 type
= TYPE_MAIN_VARIANT (type
);
5007 type_quals
= ((constp
? TYPE_QUAL_CONST
: 0)
5008 | (restrictp
? TYPE_QUAL_RESTRICT
: 0)
5009 | (volatilep
? TYPE_QUAL_VOLATILE
: 0)
5010 | ENCODE_QUAL_ADDR_SPACE (address_space
));
5012 /* Warn about storage classes that are invalid for certain
5013 kinds of declarations (parameters, typenames, etc.). */
5017 || storage_class
== csc_auto
5018 || storage_class
== csc_register
5019 || storage_class
== csc_typedef
))
5021 if (storage_class
== csc_auto
)
5023 (current_scope
== file_scope
) ? 0 : OPT_pedantic
,
5024 "function definition declared %<auto%>");
5025 if (storage_class
== csc_register
)
5026 error_at (loc
, "function definition declared %<register%>");
5027 if (storage_class
== csc_typedef
)
5028 error_at (loc
, "function definition declared %<typedef%>");
5030 error_at (loc
, "function definition declared %<__thread%>");
5032 if (storage_class
== csc_auto
5033 || storage_class
== csc_register
5034 || storage_class
== csc_typedef
)
5035 storage_class
= csc_none
;
5037 else if (decl_context
!= NORMAL
&& (storage_class
!= csc_none
|| threadp
))
5039 if (decl_context
== PARM
&& storage_class
== csc_register
)
5043 switch (decl_context
)
5047 error_at (loc
, "storage class specified for structure "
5050 error_at (loc
, "storage class specified for structure field");
5054 error_at (loc
, "storage class specified for parameter %qE",
5057 error_at (loc
, "storage class specified for unnamed parameter");
5060 error_at (loc
, "storage class specified for typename");
5063 storage_class
= csc_none
;
5067 else if (storage_class
== csc_extern
5071 /* 'extern' with initialization is invalid if not at file scope. */
5072 if (current_scope
== file_scope
)
5074 /* It is fine to have 'extern const' when compiling at C
5075 and C++ intersection. */
5076 if (!(warn_cxx_compat
&& constp
))
5077 warning_at (loc
, 0, "%qE initialized and declared %<extern%>",
5081 error_at (loc
, "%qE has both %<extern%> and initializer", name
);
5083 else if (current_scope
== file_scope
)
5085 if (storage_class
== csc_auto
)
5086 error_at (loc
, "file-scope declaration of %qE specifies %<auto%>",
5088 if (pedantic
&& storage_class
== csc_register
)
5089 pedwarn (input_location
, OPT_pedantic
,
5090 "file-scope declaration of %qE specifies %<register%>", name
);
5094 if (storage_class
== csc_extern
&& funcdef_flag
)
5095 error_at (loc
, "nested function %qE declared %<extern%>", name
);
5096 else if (threadp
&& storage_class
== csc_none
)
5098 error_at (loc
, "function-scope %qE implicitly auto and declared "
5105 /* Now figure out the structure of the declarator proper.
5106 Descend through it, creating more complex types, until we reach
5107 the declared identifier (or NULL_TREE, in an absolute declarator).
5108 At each stage we maintain an unqualified version of the type
5109 together with any qualifiers that should be applied to it with
5110 c_build_qualified_type; this way, array types including
5111 multidimensional array types are first built up in unqualified
5112 form and then the qualified form is created with
5113 TYPE_MAIN_VARIANT pointing to the unqualified form. */
5115 while (declarator
&& declarator
->kind
!= cdk_id
)
5117 if (type
== error_mark_node
)
5119 declarator
= declarator
->declarator
;
5123 /* Each level of DECLARATOR is either a cdk_array (for ...[..]),
5124 a cdk_pointer (for *...),
5125 a cdk_function (for ...(...)),
5126 a cdk_attrs (for nested attributes),
5127 or a cdk_id (for the name being declared
5128 or the place in an absolute declarator
5129 where the name was omitted).
5130 For the last case, we have just exited the loop.
5132 At this point, TYPE is the type of elements of an array,
5133 or for a function to return, or for a pointer to point to.
5134 After this sequence of ifs, TYPE is the type of the
5135 array or function or pointer, and DECLARATOR has had its
5136 outermost layer removed. */
5138 if (array_ptr_quals
!= TYPE_UNQUALIFIED
5139 || array_ptr_attrs
!= NULL_TREE
5140 || array_parm_static
)
5142 /* Only the innermost declarator (making a parameter be of
5143 array type which is converted to pointer type)
5144 may have static or type qualifiers. */
5145 error_at (loc
, "static or type qualifiers in non-parameter array declarator");
5146 array_ptr_quals
= TYPE_UNQUALIFIED
;
5147 array_ptr_attrs
= NULL_TREE
;
5148 array_parm_static
= 0;
5151 switch (declarator
->kind
)
5155 /* A declarator with embedded attributes. */
5156 tree attrs
= declarator
->u
.attrs
;
5157 const struct c_declarator
*inner_decl
;
5159 declarator
= declarator
->declarator
;
5160 inner_decl
= declarator
;
5161 while (inner_decl
->kind
== cdk_attrs
)
5162 inner_decl
= inner_decl
->declarator
;
5163 if (inner_decl
->kind
== cdk_id
)
5164 attr_flags
|= (int) ATTR_FLAG_DECL_NEXT
;
5165 else if (inner_decl
->kind
== cdk_function
)
5166 attr_flags
|= (int) ATTR_FLAG_FUNCTION_NEXT
;
5167 else if (inner_decl
->kind
== cdk_array
)
5168 attr_flags
|= (int) ATTR_FLAG_ARRAY_NEXT
;
5169 returned_attrs
= decl_attributes (&type
,
5170 chainon (returned_attrs
, attrs
),
5176 tree itype
= NULL_TREE
;
5177 tree size
= declarator
->u
.array
.dimen
;
5178 /* The index is a signed object `sizetype' bits wide. */
5179 tree index_type
= c_common_signed_type (sizetype
);
5181 array_ptr_quals
= declarator
->u
.array
.quals
;
5182 array_ptr_attrs
= declarator
->u
.array
.attrs
;
5183 array_parm_static
= declarator
->u
.array
.static_p
;
5184 array_parm_vla_unspec_p
= declarator
->u
.array
.vla_unspec_p
;
5186 declarator
= declarator
->declarator
;
5188 /* Check for some types that there cannot be arrays of. */
5190 if (VOID_TYPE_P (type
))
5193 error_at (loc
, "declaration of %qE as array of voids", name
);
5195 error_at (loc
, "declaration of type name as array of voids");
5196 type
= error_mark_node
;
5199 if (TREE_CODE (type
) == FUNCTION_TYPE
)
5202 error_at (loc
, "declaration of %qE as array of functions",
5205 error_at (loc
, "declaration of type name as array of "
5207 type
= error_mark_node
;
5210 if (pedantic
&& !in_system_header
&& flexible_array_type_p (type
))
5211 pedwarn (loc
, OPT_pedantic
,
5212 "invalid use of structure with flexible array member");
5214 if (size
== error_mark_node
)
5215 type
= error_mark_node
;
5217 if (type
== error_mark_node
)
5220 /* If size was specified, set ITYPE to a range-type for
5221 that size. Otherwise, ITYPE remains null. finish_decl
5222 may figure it out from an initial value. */
5226 bool size_maybe_const
= true;
5227 bool size_int_const
= (TREE_CODE (size
) == INTEGER_CST
5228 && !TREE_OVERFLOW (size
));
5229 bool this_size_varies
= false;
5231 /* Strip NON_LVALUE_EXPRs since we aren't using as an
5233 STRIP_TYPE_NOPS (size
);
5235 if (!INTEGRAL_TYPE_P (TREE_TYPE (size
)))
5238 error_at (loc
, "size of array %qE has non-integer type",
5242 "size of unnamed array has non-integer type");
5243 size
= integer_one_node
;
5246 size
= c_fully_fold (size
, false, &size_maybe_const
);
5248 if (pedantic
&& size_maybe_const
&& integer_zerop (size
))
5251 pedwarn (loc
, OPT_pedantic
,
5252 "ISO C forbids zero-size array %qE", name
);
5254 pedwarn (loc
, OPT_pedantic
,
5255 "ISO C forbids zero-size array");
5258 if (TREE_CODE (size
) == INTEGER_CST
&& size_maybe_const
)
5260 constant_expression_warning (size
);
5261 if (tree_int_cst_sgn (size
) < 0)
5264 error_at (loc
, "size of array %qE is negative", name
);
5266 error_at (loc
, "size of unnamed array is negative");
5267 size
= integer_one_node
;
5269 /* Handle a size folded to an integer constant but
5270 not an integer constant expression. */
5271 if (!size_int_const
)
5273 /* If this is a file scope declaration of an
5274 ordinary identifier, this is invalid code;
5275 diagnosing it here and not subsequently
5276 treating the type as variable-length avoids
5277 more confusing diagnostics later. */
5278 if ((decl_context
== NORMAL
|| decl_context
== FIELD
)
5279 && current_scope
== file_scope
)
5280 pedwarn (input_location
, 0,
5281 "variably modified %qE at file scope",
5284 this_size_varies
= size_varies
= true;
5285 warn_variable_length_array (name
, size
);
5288 else if ((decl_context
== NORMAL
|| decl_context
== FIELD
)
5289 && current_scope
== file_scope
)
5291 error_at (loc
, "variably modified %qE at file scope", name
);
5292 size
= integer_one_node
;
5296 /* Make sure the array size remains visibly
5297 nonconstant even if it is (eg) a const variable
5298 with known value. */
5299 this_size_varies
= size_varies
= true;
5300 warn_variable_length_array (name
, size
);
5303 if (integer_zerop (size
) && !this_size_varies
)
5305 /* A zero-length array cannot be represented with
5306 an unsigned index type, which is what we'll
5307 get with build_index_type. Create an
5308 open-ended range instead. */
5309 itype
= build_range_type (sizetype
, size
, NULL_TREE
);
5313 /* Arrange for the SAVE_EXPR on the inside of the
5314 MINUS_EXPR, which allows the -1 to get folded
5315 with the +1 that happens when building TYPE_SIZE. */
5317 size
= c_variable_size (size
);
5318 if (this_size_varies
&& TREE_CODE (size
) == INTEGER_CST
)
5319 size
= build2 (COMPOUND_EXPR
, TREE_TYPE (size
),
5320 integer_zero_node
, size
);
5322 /* Compute the maximum valid index, that is, size
5323 - 1. Do the calculation in index_type, so that
5324 if it is a variable the computations will be
5325 done in the proper mode. */
5326 itype
= fold_build2_loc (loc
, MINUS_EXPR
, index_type
,
5327 convert (index_type
, size
),
5328 convert (index_type
,
5331 /* If that overflowed, the array is too big. ???
5332 While a size of INT_MAX+1 technically shouldn't
5333 cause an overflow (because we subtract 1), the
5334 overflow is recorded during the conversion to
5335 index_type, before the subtraction. Handling
5336 this case seems like an unnecessary
5338 if (TREE_CODE (itype
) == INTEGER_CST
5339 && TREE_OVERFLOW (itype
))
5342 error_at (loc
, "size of array %qE is too large",
5345 error_at (loc
, "size of unnamed array is too large");
5346 type
= error_mark_node
;
5350 itype
= build_index_type (itype
);
5352 if (this_size_varies
)
5355 *expr
= build2 (COMPOUND_EXPR
, TREE_TYPE (size
),
5359 *expr_const_operands
&= size_maybe_const
;
5362 else if (decl_context
== FIELD
)
5364 bool flexible_array_member
= false;
5365 if (array_parm_vla_unspec_p
)
5366 /* Field names can in fact have function prototype
5367 scope so [*] is disallowed here through making
5368 the field variably modified, not through being
5369 something other than a declaration with function
5374 const struct c_declarator
*t
= declarator
;
5375 while (t
->kind
== cdk_attrs
)
5377 flexible_array_member
= (t
->kind
== cdk_id
);
5379 if (flexible_array_member
5380 && pedantic
&& !flag_isoc99
&& !in_system_header
)
5381 pedwarn (loc
, OPT_pedantic
,
5382 "ISO C90 does not support flexible array members");
5384 /* ISO C99 Flexible array members are effectively
5385 identical to GCC's zero-length array extension. */
5386 if (flexible_array_member
|| array_parm_vla_unspec_p
)
5387 itype
= build_range_type (sizetype
, size_zero_node
,
5390 else if (decl_context
== PARM
)
5392 if (array_parm_vla_unspec_p
)
5394 itype
= build_range_type (sizetype
, size_zero_node
, NULL_TREE
);
5398 else if (decl_context
== TYPENAME
)
5400 if (array_parm_vla_unspec_p
)
5403 warning (0, "%<[*]%> not in a declaration");
5404 /* We use this to avoid messing up with incomplete
5405 array types of the same type, that would
5406 otherwise be modified below. */
5407 itype
= build_range_type (sizetype
, size_zero_node
,
5413 /* Complain about arrays of incomplete types. */
5414 if (!COMPLETE_TYPE_P (type
))
5416 error_at (loc
, "array type has incomplete element type");
5417 type
= error_mark_node
;
5420 /* When itype is NULL, a shared incomplete array type is
5421 returned for all array of a given type. Elsewhere we
5422 make sure we don't complete that type before copying
5423 it, but here we want to make sure we don't ever
5424 modify the shared type, so we gcc_assert (itype)
5427 addr_space_t as
= DECODE_QUAL_ADDR_SPACE (type_quals
);
5428 if (!ADDR_SPACE_GENERIC_P (as
) && as
!= TYPE_ADDR_SPACE (type
))
5429 type
= build_qualified_type (type
,
5430 ENCODE_QUAL_ADDR_SPACE (as
));
5432 type
= build_array_type (type
, itype
);
5435 if (type
!= error_mark_node
)
5439 /* It is ok to modify type here even if itype is
5440 NULL: if size_varies, we're in a
5441 multi-dimensional array and the inner type has
5442 variable size, so the enclosing shared array type
5444 if (size
&& TREE_CODE (size
) == INTEGER_CST
)
5446 = build_distinct_type_copy (TYPE_MAIN_VARIANT (type
));
5447 C_TYPE_VARIABLE_SIZE (type
) = 1;
5450 /* The GCC extension for zero-length arrays differs from
5451 ISO flexible array members in that sizeof yields
5453 if (size
&& integer_zerop (size
))
5456 type
= build_distinct_type_copy (TYPE_MAIN_VARIANT (type
));
5457 TYPE_SIZE (type
) = bitsize_zero_node
;
5458 TYPE_SIZE_UNIT (type
) = size_zero_node
;
5459 SET_TYPE_STRUCTURAL_EQUALITY (type
);
5461 if (array_parm_vla_unspec_p
)
5464 /* The type is complete. C99 6.7.5.2p4 */
5465 type
= build_distinct_type_copy (TYPE_MAIN_VARIANT (type
));
5466 TYPE_SIZE (type
) = bitsize_zero_node
;
5467 TYPE_SIZE_UNIT (type
) = size_zero_node
;
5468 SET_TYPE_STRUCTURAL_EQUALITY (type
);
5472 if (decl_context
!= PARM
5473 && (array_ptr_quals
!= TYPE_UNQUALIFIED
5474 || array_ptr_attrs
!= NULL_TREE
5475 || array_parm_static
))
5477 error_at (loc
, "static or type qualifiers in non-parameter array declarator");
5478 array_ptr_quals
= TYPE_UNQUALIFIED
;
5479 array_ptr_attrs
= NULL_TREE
;
5480 array_parm_static
= 0;
5486 /* Say it's a definition only for the declarator closest
5487 to the identifier, apart possibly from some
5489 bool really_funcdef
= false;
5493 const struct c_declarator
*t
= declarator
->declarator
;
5494 while (t
->kind
== cdk_attrs
)
5496 really_funcdef
= (t
->kind
== cdk_id
);
5499 /* Declaring a function type. Make sure we have a valid
5500 type for the function to return. */
5501 if (type
== error_mark_node
)
5504 size_varies
= false;
5506 /* Warn about some types functions can't return. */
5507 if (TREE_CODE (type
) == FUNCTION_TYPE
)
5510 error_at (loc
, "%qE declared as function returning a "
5513 error_at (loc
, "type name declared as function "
5514 "returning a function");
5515 type
= integer_type_node
;
5517 if (TREE_CODE (type
) == ARRAY_TYPE
)
5520 error_at (loc
, "%qE declared as function returning an array",
5523 error_at (loc
, "type name declared as function returning "
5525 type
= integer_type_node
;
5527 errmsg
= targetm
.invalid_return_type (type
);
5531 type
= integer_type_node
;
5534 /* Construct the function type and go to the next
5535 inner layer of declarator. */
5536 arg_info
= declarator
->u
.arg_info
;
5537 arg_types
= grokparms (arg_info
, really_funcdef
);
5539 put_pending_sizes (arg_info
->pending_sizes
);
5541 /* Type qualifiers before the return type of the function
5542 qualify the return type, not the function type. */
5545 /* Type qualifiers on a function return type are
5546 normally permitted by the standard but have no
5547 effect, so give a warning at -Wreturn-type.
5548 Qualifiers on a void return type are banned on
5549 function definitions in ISO C; GCC used to used
5550 them for noreturn functions. */
5551 if (VOID_TYPE_P (type
) && really_funcdef
)
5553 "function definition has qualified void return type");
5555 warning_at (loc
, OPT_Wignored_qualifiers
,
5556 "type qualifiers ignored on function return type");
5558 type
= c_build_qualified_type (type
, type_quals
);
5560 type_quals
= TYPE_UNQUALIFIED
;
5562 type
= build_function_type (type
, arg_types
);
5563 declarator
= declarator
->declarator
;
5565 /* Set the TYPE_CONTEXTs for each tagged type which is local to
5566 the formal parameter list of this FUNCTION_TYPE to point to
5567 the FUNCTION_TYPE node itself. */
5572 FOR_EACH_VEC_ELT_REVERSE (c_arg_tag
, arg_info
->tags
, ix
, tag
)
5573 TYPE_CONTEXT (tag
->type
) = type
;
5579 /* Merge any constancy or volatility into the target type
5582 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
5584 pedwarn (loc
, OPT_pedantic
,
5585 "ISO C forbids qualified function types");
5587 type
= c_build_qualified_type (type
, type_quals
);
5588 size_varies
= false;
5590 /* When the pointed-to type involves components of variable size,
5591 care must be taken to ensure that the size evaluation code is
5592 emitted early enough to dominate all the possible later uses
5593 and late enough for the variables on which it depends to have
5596 This is expected to happen automatically when the pointed-to
5597 type has a name/declaration of it's own, but special attention
5598 is required if the type is anonymous.
5600 We handle the NORMAL and FIELD contexts here by attaching an
5601 artificial TYPE_DECL to such pointed-to type. This forces the
5602 sizes evaluation at a safe point and ensures it is not deferred
5603 until e.g. within a deeper conditional context.
5605 We expect nothing to be needed here for PARM or TYPENAME.
5606 Pushing a TYPE_DECL at this point for TYPENAME would actually
5607 be incorrect, as we might be in the middle of an expression
5608 with side effects on the pointed-to type size "arguments" prior
5609 to the pointer declaration point and the fake TYPE_DECL in the
5610 enclosing context would force the size evaluation prior to the
5613 if (!TYPE_NAME (type
)
5614 && (decl_context
== NORMAL
|| decl_context
== FIELD
)
5615 && variably_modified_type_p (type
, NULL_TREE
))
5617 tree decl
= build_decl (loc
, TYPE_DECL
, NULL_TREE
, type
);
5618 DECL_ARTIFICIAL (decl
) = 1;
5620 finish_decl (decl
, loc
, NULL_TREE
, NULL_TREE
, NULL_TREE
);
5621 TYPE_NAME (type
) = decl
;
5624 type
= build_pointer_type (type
);
5626 /* Process type qualifiers (such as const or volatile)
5627 that were given inside the `*'. */
5628 type_quals
= declarator
->u
.pointer_quals
;
5630 declarator
= declarator
->declarator
;
5637 *decl_attrs
= chainon (returned_attrs
, *decl_attrs
);
5639 /* Now TYPE has the actual type, apart from any qualifiers in
5642 /* Warn about address space used for things other than static memory or
5644 address_space
= DECODE_QUAL_ADDR_SPACE (type_quals
);
5645 if (!ADDR_SPACE_GENERIC_P (address_space
))
5647 if (decl_context
== NORMAL
)
5649 switch (storage_class
)
5652 error ("%qs combined with %<auto%> qualifier for %qE",
5653 c_addr_space_name (address_space
), name
);
5656 error ("%qs combined with %<register%> qualifier for %qE",
5657 c_addr_space_name (address_space
), name
);
5660 if (current_function_scope
)
5662 error ("%qs specified for auto variable %qE",
5663 c_addr_space_name (address_space
), name
);
5675 else if (decl_context
== PARM
&& TREE_CODE (type
) != ARRAY_TYPE
)
5678 error ("%qs specified for parameter %qE",
5679 c_addr_space_name (address_space
), name
);
5681 error ("%qs specified for unnamed parameter",
5682 c_addr_space_name (address_space
));
5684 else if (decl_context
== FIELD
)
5687 error ("%qs specified for structure field %qE",
5688 c_addr_space_name (address_space
), name
);
5690 error ("%qs specified for structure field",
5691 c_addr_space_name (address_space
));
5695 /* Check the type and width of a bit-field. */
5697 check_bitfield_type_and_width (&type
, width
, name
);
5699 /* Did array size calculations overflow? */
5701 if (TREE_CODE (type
) == ARRAY_TYPE
5702 && COMPLETE_TYPE_P (type
)
5703 && TREE_CODE (TYPE_SIZE_UNIT (type
)) == INTEGER_CST
5704 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type
)))
5707 error_at (loc
, "size of array %qE is too large", name
);
5709 error_at (loc
, "size of unnamed array is too large");
5710 /* If we proceed with the array type as it is, we'll eventually
5711 crash in tree_low_cst(). */
5712 type
= error_mark_node
;
5715 /* If this is declaring a typedef name, return a TYPE_DECL. */
5717 if (storage_class
== csc_typedef
)
5720 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
5722 pedwarn (loc
, OPT_pedantic
,
5723 "ISO C forbids qualified function types");
5725 type
= c_build_qualified_type (type
, type_quals
);
5726 decl
= build_decl (declarator
->id_loc
,
5727 TYPE_DECL
, declarator
->u
.id
, type
);
5728 if (declspecs
->explicit_signed_p
)
5729 C_TYPEDEF_EXPLICITLY_SIGNED (decl
) = 1;
5730 if (declspecs
->inline_p
)
5731 pedwarn (loc
, 0,"typedef %q+D declared %<inline%>", decl
);
5733 if (warn_cxx_compat
&& declarator
->u
.id
!= NULL_TREE
)
5735 struct c_binding
*b
= I_TAG_BINDING (declarator
->u
.id
);
5738 && b
->decl
!= NULL_TREE
5739 && (B_IN_CURRENT_SCOPE (b
)
5740 || (current_scope
== file_scope
&& B_IN_EXTERNAL_SCOPE (b
)))
5741 && TYPE_MAIN_VARIANT (b
->decl
) != TYPE_MAIN_VARIANT (type
))
5743 warning_at (declarator
->id_loc
, OPT_Wc___compat
,
5744 ("using %qD as both a typedef and a tag is "
5747 if (b
->locus
!= UNKNOWN_LOCATION
)
5748 inform (b
->locus
, "originally defined here");
5755 /* If this is a type name (such as, in a cast or sizeof),
5756 compute the type and return it now. */
5758 if (decl_context
== TYPENAME
)
5760 /* Note that the grammar rejects storage classes in typenames
5762 gcc_assert (storage_class
== csc_none
&& !threadp
5763 && !declspecs
->inline_p
);
5764 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
5766 pedwarn (loc
, OPT_pedantic
,
5767 "ISO C forbids const or volatile function types");
5769 type
= c_build_qualified_type (type
, type_quals
);
5773 if (pedantic
&& decl_context
== FIELD
5774 && variably_modified_type_p (type
, NULL_TREE
))
5777 pedwarn (loc
, OPT_pedantic
, "a member of a structure or union cannot "
5778 "have a variably modified type");
5781 /* Aside from typedefs and type names (handle above),
5782 `void' at top level (not within pointer)
5783 is allowed only in public variables.
5784 We don't complain about parms either, but that is because
5785 a better error message can be made later. */
5787 if (VOID_TYPE_P (type
) && decl_context
!= PARM
5788 && !((decl_context
!= FIELD
&& TREE_CODE (type
) != FUNCTION_TYPE
)
5789 && (storage_class
== csc_extern
5790 || (current_scope
== file_scope
5791 && !(storage_class
== csc_static
5792 || storage_class
== csc_register
)))))
5794 error_at (loc
, "variable or field %qE declared void", name
);
5795 type
= integer_type_node
;
5798 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
5799 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
5804 if (decl_context
== PARM
)
5808 /* A parameter declared as an array of T is really a pointer to T.
5809 One declared as a function is really a pointer to a function. */
5811 if (TREE_CODE (type
) == ARRAY_TYPE
)
5813 /* Transfer const-ness of array into that of type pointed to. */
5814 type
= TREE_TYPE (type
);
5816 type
= c_build_qualified_type (type
, type_quals
);
5817 type
= build_pointer_type (type
);
5818 type_quals
= array_ptr_quals
;
5820 type
= c_build_qualified_type (type
, type_quals
);
5822 /* We don't yet implement attributes in this context. */
5823 if (array_ptr_attrs
!= NULL_TREE
)
5824 warning_at (loc
, OPT_Wattributes
,
5825 "attributes in parameter array declarator ignored");
5827 size_varies
= false;
5829 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
5832 pedwarn (loc
, OPT_pedantic
,
5833 "ISO C forbids qualified function types");
5835 type
= c_build_qualified_type (type
, type_quals
);
5836 type
= build_pointer_type (type
);
5837 type_quals
= TYPE_UNQUALIFIED
;
5839 else if (type_quals
)
5840 type
= c_build_qualified_type (type
, type_quals
);
5842 decl
= build_decl (declarator
->id_loc
,
5843 PARM_DECL
, declarator
->u
.id
, type
);
5845 C_DECL_VARIABLE_SIZE (decl
) = 1;
5847 /* Compute the type actually passed in the parmlist,
5848 for the case where there is no prototype.
5849 (For example, shorts and chars are passed as ints.)
5850 When there is a prototype, this is overridden later. */
5852 if (type
== error_mark_node
)
5853 promoted_type
= type
;
5855 promoted_type
= c_type_promotes_to (type
);
5857 DECL_ARG_TYPE (decl
) = promoted_type
;
5858 if (declspecs
->inline_p
)
5859 pedwarn (loc
, 0, "parameter %q+D declared %<inline%>", decl
);
5861 else if (decl_context
== FIELD
)
5863 /* Note that the grammar rejects storage classes in typenames
5865 gcc_assert (storage_class
== csc_none
&& !threadp
5866 && !declspecs
->inline_p
);
5868 /* Structure field. It may not be a function. */
5870 if (TREE_CODE (type
) == FUNCTION_TYPE
)
5872 error_at (loc
, "field %qE declared as a function", name
);
5873 type
= build_pointer_type (type
);
5875 else if (TREE_CODE (type
) != ERROR_MARK
5876 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type
))
5879 error_at (loc
, "field %qE has incomplete type", name
);
5881 error_at (loc
, "unnamed field has incomplete type");
5882 type
= error_mark_node
;
5884 type
= c_build_qualified_type (type
, type_quals
);
5885 decl
= build_decl (declarator
->id_loc
,
5886 FIELD_DECL
, declarator
->u
.id
, type
);
5887 DECL_NONADDRESSABLE_P (decl
) = bitfield
;
5888 if (bitfield
&& !declarator
->u
.id
)
5889 TREE_NO_WARNING (decl
) = 1;
5892 C_DECL_VARIABLE_SIZE (decl
) = 1;
5894 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
5896 if (storage_class
== csc_register
|| threadp
)
5898 error_at (loc
, "invalid storage class for function %qE", name
);
5900 else if (current_scope
!= file_scope
)
5902 /* Function declaration not at file scope. Storage
5903 classes other than `extern' are not allowed, C99
5904 6.7.1p5, and `extern' makes no difference. However,
5905 GCC allows 'auto', perhaps with 'inline', to support
5906 nested functions. */
5907 if (storage_class
== csc_auto
)
5908 pedwarn (loc
, OPT_pedantic
,
5909 "invalid storage class for function %qE", name
);
5910 else if (storage_class
== csc_static
)
5912 error_at (loc
, "invalid storage class for function %qE", name
);
5914 storage_class
= declspecs
->storage_class
= csc_none
;
5920 decl
= build_decl (declarator
->id_loc
,
5921 FUNCTION_DECL
, declarator
->u
.id
, type
);
5922 decl
= build_decl_attribute_variant (decl
, decl_attr
);
5924 if (pedantic
&& type_quals
&& !DECL_IN_SYSTEM_HEADER (decl
))
5925 pedwarn (loc
, OPT_pedantic
,
5926 "ISO C forbids qualified function types");
5928 /* Every function declaration is an external reference
5929 (DECL_EXTERNAL) except for those which are not at file
5930 scope and are explicitly declared "auto". This is
5931 forbidden by standard C (C99 6.7.1p5) and is interpreted by
5932 GCC to signify a forward declaration of a nested function. */
5933 if (storage_class
== csc_auto
&& current_scope
!= file_scope
)
5934 DECL_EXTERNAL (decl
) = 0;
5935 /* In C99, a function which is declared 'inline' with 'extern'
5936 is not an external reference (which is confusing). It
5937 means that the later definition of the function must be output
5938 in this file, C99 6.7.4p6. In GNU C89, a function declared
5939 'extern inline' is an external reference. */
5940 else if (declspecs
->inline_p
&& storage_class
!= csc_static
)
5941 DECL_EXTERNAL (decl
) = ((storage_class
== csc_extern
)
5942 == flag_gnu89_inline
);
5944 DECL_EXTERNAL (decl
) = !initialized
;
5946 /* Record absence of global scope for `static' or `auto'. */
5948 = !(storage_class
== csc_static
|| storage_class
== csc_auto
);
5950 /* For a function definition, record the argument information
5951 block where store_parm_decls will look for it. */
5953 current_function_arg_info
= arg_info
;
5955 if (declspecs
->default_int_p
)
5956 C_FUNCTION_IMPLICIT_INT (decl
) = 1;
5958 /* Record presence of `inline', if it is reasonable. */
5959 if (flag_hosted
&& MAIN_NAME_P (declarator
->u
.id
))
5961 if (declspecs
->inline_p
)
5962 pedwarn (loc
, 0, "cannot inline function %<main%>");
5964 else if (declspecs
->inline_p
)
5965 /* Record that the function is declared `inline'. */
5966 DECL_DECLARED_INLINE_P (decl
) = 1;
5970 /* It's a variable. */
5971 /* An uninitialized decl with `extern' is a reference. */
5972 int extern_ref
= !initialized
&& storage_class
== csc_extern
;
5974 type
= c_build_qualified_type (type
, type_quals
);
5976 /* C99 6.2.2p7: It is invalid (compile-time undefined
5977 behavior) to create an 'extern' declaration for a
5978 variable if there is a global declaration that is
5979 'static' and the global declaration is not visible.
5980 (If the static declaration _is_ currently visible,
5981 the 'extern' declaration is taken to refer to that decl.) */
5982 if (extern_ref
&& current_scope
!= file_scope
)
5984 tree global_decl
= identifier_global_value (declarator
->u
.id
);
5985 tree visible_decl
= lookup_name (declarator
->u
.id
);
5988 && global_decl
!= visible_decl
5989 && TREE_CODE (global_decl
) == VAR_DECL
5990 && !TREE_PUBLIC (global_decl
))
5991 error_at (loc
, "variable previously declared %<static%> "
5992 "redeclared %<extern%>");
5995 decl
= build_decl (declarator
->id_loc
,
5996 VAR_DECL
, declarator
->u
.id
, type
);
5998 C_DECL_VARIABLE_SIZE (decl
) = 1;
6000 if (declspecs
->inline_p
)
6001 pedwarn (loc
, 0, "variable %q+D declared %<inline%>", decl
);
6003 /* At file scope, an initialized extern declaration may follow
6004 a static declaration. In that case, DECL_EXTERNAL will be
6005 reset later in start_decl. */
6006 DECL_EXTERNAL (decl
) = (storage_class
== csc_extern
);
6008 /* At file scope, the presence of a `static' or `register' storage
6009 class specifier, or the absence of all storage class specifiers
6010 makes this declaration a definition (perhaps tentative). Also,
6011 the absence of `static' makes it public. */
6012 if (current_scope
== file_scope
)
6014 TREE_PUBLIC (decl
) = storage_class
!= csc_static
;
6015 TREE_STATIC (decl
) = !extern_ref
;
6017 /* Not at file scope, only `static' makes a static definition. */
6020 TREE_STATIC (decl
) = (storage_class
== csc_static
);
6021 TREE_PUBLIC (decl
) = extern_ref
;
6025 DECL_TLS_MODEL (decl
) = decl_default_tls_model (decl
);
6028 if ((storage_class
== csc_extern
6029 || (storage_class
== csc_none
6030 && TREE_CODE (type
) == FUNCTION_TYPE
6032 && variably_modified_type_p (type
, NULL_TREE
))
6035 if (TREE_CODE (type
) == FUNCTION_TYPE
)
6036 error_at (loc
, "non-nested function with variably modified type");
6038 error_at (loc
, "object with variably modified type must have "
6042 /* Record `register' declaration for warnings on &
6043 and in case doing stupid register allocation. */
6045 if (storage_class
== csc_register
)
6047 C_DECL_REGISTER (decl
) = 1;
6048 DECL_REGISTER (decl
) = 1;
6051 /* Record constancy and volatility. */
6052 c_apply_type_quals_to_decl (type_quals
, decl
);
6054 /* If a type has volatile components, it should be stored in memory.
6055 Otherwise, the fact that those components are volatile
6056 will be ignored, and would even crash the compiler.
6057 Of course, this only makes sense on VAR,PARM, and RESULT decl's. */
6058 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl
))
6059 && (TREE_CODE (decl
) == VAR_DECL
|| TREE_CODE (decl
) == PARM_DECL
6060 || TREE_CODE (decl
) == RESULT_DECL
))
6062 /* It is not an error for a structure with volatile fields to
6063 be declared register, but reset DECL_REGISTER since it
6064 cannot actually go in a register. */
6065 int was_reg
= C_DECL_REGISTER (decl
);
6066 C_DECL_REGISTER (decl
) = 0;
6067 DECL_REGISTER (decl
) = 0;
6068 c_mark_addressable (decl
);
6069 C_DECL_REGISTER (decl
) = was_reg
;
6072 /* This is the earliest point at which we might know the assembler
6073 name of a variable. Thus, if it's known before this, die horribly. */
6074 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl
));
6077 && TREE_CODE (decl
) == VAR_DECL
6078 && TREE_PUBLIC (decl
)
6079 && TREE_STATIC (decl
)
6080 && (TREE_CODE (TREE_TYPE (decl
)) == RECORD_TYPE
6081 || TREE_CODE (TREE_TYPE (decl
)) == UNION_TYPE
6082 || TREE_CODE (TREE_TYPE (decl
)) == ENUMERAL_TYPE
)
6083 && TYPE_NAME (TREE_TYPE (decl
)) == NULL_TREE
)
6084 warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wc___compat
,
6085 ("non-local variable %qD with anonymous type is "
6086 "questionable in C++"),
6093 /* Decode the parameter-list info for a function type or function definition.
6094 The argument is the value returned by `get_parm_info' (or made in c-parse.c
6095 if there is an identifier list instead of a parameter decl list).
6096 These two functions are separate because when a function returns
6097 or receives functions then each is called multiple times but the order
6098 of calls is different. The last call to `grokparms' is always the one
6099 that contains the formal parameter names of a function definition.
6101 Return a list of arg types to use in the FUNCTION_TYPE for this function.
6103 FUNCDEF_FLAG is true for a function definition, false for
6104 a mere declaration. A nonempty identifier-list gets an error message
6105 when FUNCDEF_FLAG is false. */
6108 grokparms (struct c_arg_info
*arg_info
, bool funcdef_flag
)
6110 tree arg_types
= arg_info
->types
;
6112 if (funcdef_flag
&& arg_info
->had_vla_unspec
)
6114 /* A function definition isn't function prototype scope C99 6.2.1p4. */
6116 error ("%<[*]%> not allowed in other than function prototype scope");
6119 if (arg_types
== 0 && !funcdef_flag
&& !in_system_header
)
6120 warning (OPT_Wstrict_prototypes
,
6121 "function declaration isn%'t a prototype");
6123 if (arg_types
== error_mark_node
)
6124 return 0; /* don't set TYPE_ARG_TYPES in this case */
6126 else if (arg_types
&& TREE_CODE (TREE_VALUE (arg_types
)) == IDENTIFIER_NODE
)
6129 pedwarn (input_location
, 0, "parameter names (without types) in function declaration");
6131 arg_info
->parms
= arg_info
->types
;
6132 arg_info
->types
= 0;
6137 tree parm
, type
, typelt
;
6138 unsigned int parmno
;
6141 /* If there is a parameter of incomplete type in a definition,
6142 this is an error. In a declaration this is valid, and a
6143 struct or union type may be completed later, before any calls
6144 or definition of the function. In the case where the tag was
6145 first declared within the parameter list, a warning has
6146 already been given. If a parameter has void type, then
6147 however the function cannot be defined or called, so
6150 for (parm
= arg_info
->parms
, typelt
= arg_types
, parmno
= 1;
6152 parm
= DECL_CHAIN (parm
), typelt
= TREE_CHAIN (typelt
), parmno
++)
6154 type
= TREE_VALUE (typelt
);
6155 if (type
== error_mark_node
)
6158 if (!COMPLETE_TYPE_P (type
))
6162 if (DECL_NAME (parm
))
6163 error_at (input_location
,
6164 "parameter %u (%q+D) has incomplete type",
6167 error_at (DECL_SOURCE_LOCATION (parm
),
6168 "parameter %u has incomplete type",
6171 TREE_VALUE (typelt
) = error_mark_node
;
6172 TREE_TYPE (parm
) = error_mark_node
;
6173 arg_types
= NULL_TREE
;
6175 else if (VOID_TYPE_P (type
))
6177 if (DECL_NAME (parm
))
6178 warning_at (input_location
, 0,
6179 "parameter %u (%q+D) has void type",
6182 warning_at (DECL_SOURCE_LOCATION (parm
), 0,
6183 "parameter %u has void type",
6188 errmsg
= targetm
.invalid_parameter_type (type
);
6192 TREE_VALUE (typelt
) = error_mark_node
;
6193 TREE_TYPE (parm
) = error_mark_node
;
6194 arg_types
= NULL_TREE
;
6197 if (DECL_NAME (parm
) && TREE_USED (parm
))
6198 warn_if_shadowing (parm
);
6204 /* Allocate and initialize a c_arg_info structure from the parser's
6208 build_arg_info (void)
6210 struct c_arg_info
*ret
= XOBNEW (&parser_obstack
, struct c_arg_info
);
6211 ret
->parms
= NULL_TREE
;
6213 ret
->types
= NULL_TREE
;
6214 ret
->others
= NULL_TREE
;
6215 ret
->pending_sizes
= NULL
;
6216 ret
->had_vla_unspec
= 0;
6220 /* Take apart the current scope and return a c_arg_info structure with
6221 info on a parameter list just parsed.
6223 This structure is later fed to 'grokparms' and 'store_parm_decls'.
6225 ELLIPSIS being true means the argument list ended in '...' so don't
6226 append a sentinel (void_list_node) to the end of the type-list. */
6229 get_parm_info (bool ellipsis
)
6231 struct c_binding
*b
= current_scope
->bindings
;
6232 struct c_arg_info
*arg_info
= build_arg_info ();
6235 VEC(c_arg_tag
,gc
) *tags
= NULL
;
6239 static bool explained_incomplete_types
= false;
6240 bool gave_void_only_once_err
= false;
6242 arg_info
->had_vla_unspec
= current_scope
->had_vla_unspec
;
6244 /* The bindings in this scope must not get put into a block.
6245 We will take care of deleting the binding nodes. */
6246 current_scope
->bindings
= 0;
6248 /* This function is only called if there was *something* on the
6252 /* A parameter list consisting solely of 'void' indicates that the
6253 function takes no arguments. But if the 'void' is qualified
6254 (by 'const' or 'volatile'), or has a storage class specifier
6255 ('register'), then the behavior is undefined; issue an error.
6256 Typedefs for 'void' are OK (see DR#157). */
6257 if (b
->prev
== 0 /* one binding */
6258 && TREE_CODE (b
->decl
) == PARM_DECL
/* which is a parameter */
6259 && !DECL_NAME (b
->decl
) /* anonymous */
6260 && VOID_TYPE_P (TREE_TYPE (b
->decl
))) /* of void type */
6262 if (TREE_THIS_VOLATILE (b
->decl
)
6263 || TREE_READONLY (b
->decl
)
6264 || C_DECL_REGISTER (b
->decl
))
6265 error ("%<void%> as only parameter may not be qualified");
6267 /* There cannot be an ellipsis. */
6269 error ("%<void%> must be the only parameter");
6271 arg_info
->types
= void_list_node
;
6276 types
= void_list_node
;
6278 /* Break up the bindings list into parms, tags, types, and others;
6279 apply sanity checks; purge the name-to-decl bindings. */
6282 tree decl
= b
->decl
;
6283 tree type
= TREE_TYPE (decl
);
6285 const char *keyword
;
6287 switch (TREE_CODE (decl
))
6292 gcc_assert (I_SYMBOL_BINDING (b
->id
) == b
);
6293 I_SYMBOL_BINDING (b
->id
) = b
->shadowed
;
6296 /* Check for forward decls that never got their actual decl. */
6297 if (TREE_ASM_WRITTEN (decl
))
6298 error ("parameter %q+D has just a forward declaration", decl
);
6299 /* Check for (..., void, ...) and issue an error. */
6300 else if (VOID_TYPE_P (type
) && !DECL_NAME (decl
))
6302 if (!gave_void_only_once_err
)
6304 error ("%<void%> must be the only parameter");
6305 gave_void_only_once_err
= true;
6310 /* Valid parameter, add it to the list. */
6311 DECL_CHAIN (decl
) = parms
;
6314 /* Since there is a prototype, args are passed in their
6315 declared types. The back end may override this later. */
6316 DECL_ARG_TYPE (decl
) = type
;
6317 types
= tree_cons (0, type
, types
);
6321 case ENUMERAL_TYPE
: keyword
= "enum"; goto tag
;
6322 case UNION_TYPE
: keyword
= "union"; goto tag
;
6323 case RECORD_TYPE
: keyword
= "struct"; goto tag
;
6325 /* Types may not have tag-names, in which case the type
6326 appears in the bindings list with b->id NULL. */
6329 gcc_assert (I_TAG_BINDING (b
->id
) == b
);
6330 I_TAG_BINDING (b
->id
) = b
->shadowed
;
6333 /* Warn about any struct, union or enum tags defined in a
6334 parameter list. The scope of such types is limited to
6335 the parameter list, which is rarely if ever desirable
6336 (it's impossible to call such a function with type-
6337 correct arguments). An anonymous union parm type is
6338 meaningful as a GNU extension, so don't warn for that. */
6339 if (TREE_CODE (decl
) != UNION_TYPE
|| b
->id
!= 0)
6342 /* The %s will be one of 'struct', 'union', or 'enum'. */
6343 warning (0, "%<%s %E%> declared inside parameter list",
6346 /* The %s will be one of 'struct', 'union', or 'enum'. */
6347 warning (0, "anonymous %s declared inside parameter list",
6350 if (!explained_incomplete_types
)
6352 warning (0, "its scope is only this definition or declaration,"
6353 " which is probably not what you want");
6354 explained_incomplete_types
= true;
6358 tag
= VEC_safe_push (c_arg_tag
, gc
, tags
, NULL
);
6366 /* CONST_DECLs appear here when we have an embedded enum,
6367 and TYPE_DECLs appear here when we have an embedded struct
6368 or union. No warnings for this - we already warned about the
6369 type itself. FUNCTION_DECLs appear when there is an implicit
6370 function declaration in the parameter list. */
6372 /* When we reinsert this decl in the function body, we need
6373 to reconstruct whether it was marked as nested. */
6374 gcc_assert (TREE_CODE (decl
) == FUNCTION_DECL
6377 DECL_CHAIN (decl
) = others
;
6382 /* error_mark_node appears here when we have an undeclared
6383 variable. Just throw it away. */
6386 gcc_assert (I_SYMBOL_BINDING (b
->id
) == b
);
6387 I_SYMBOL_BINDING (b
->id
) = b
->shadowed
;
6391 /* Other things that might be encountered. */
6398 b
= free_binding_and_advance (b
);
6401 arg_info
->parms
= parms
;
6402 arg_info
->tags
= tags
;
6403 arg_info
->types
= types
;
6404 arg_info
->others
= others
;
6405 arg_info
->pending_sizes
= get_pending_sizes ();
6409 /* Get the struct, enum or union (CODE says which) with tag NAME.
6410 Define the tag as a forward-reference with location LOC if it is
6411 not defined. Return a c_typespec structure for the type
6415 parser_xref_tag (location_t loc
, enum tree_code code
, tree name
)
6417 struct c_typespec ret
;
6421 ret
.expr
= NULL_TREE
;
6422 ret
.expr_const_operands
= true;
6424 /* If a cross reference is requested, look up the type
6425 already defined for this tag and return it. */
6427 ref
= lookup_tag (code
, name
, 0, &refloc
);
6428 /* If this is the right type of tag, return what we found.
6429 (This reference will be shadowed by shadow_tag later if appropriate.)
6430 If this is the wrong type of tag, do not return it. If it was the
6431 wrong type in the same scope, we will have had an error
6432 message already; if in a different scope and declaring
6433 a name, pending_xref_error will give an error message; but if in a
6434 different scope and not declaring a name, this tag should
6435 shadow the previous declaration of a different type of tag, and
6436 this would not work properly if we return the reference found.
6437 (For example, with "struct foo" in an outer scope, "union foo;"
6438 must shadow that tag with a new one of union type.) */
6439 ret
.kind
= (ref
? ctsk_tagref
: ctsk_tagfirstref
);
6440 if (ref
&& TREE_CODE (ref
) == code
)
6442 if (C_TYPE_DEFINED_IN_STRUCT (ref
)
6443 && loc
!= UNKNOWN_LOCATION
6449 warning_at (loc
, OPT_Wc___compat
,
6450 ("enum type defined in struct or union "
6451 "is not visible in C++"));
6452 inform (refloc
, "enum type defined here");
6455 warning_at (loc
, OPT_Wc___compat
,
6456 ("struct defined in struct or union "
6457 "is not visible in C++"));
6458 inform (refloc
, "struct defined here");
6461 warning_at (loc
, OPT_Wc___compat
,
6462 ("union defined in struct or union "
6463 "is not visible in C++"));
6464 inform (refloc
, "union defined here");
6475 /* If no such tag is yet defined, create a forward-reference node
6476 and record it as the "definition".
6477 When a real declaration of this type is found,
6478 the forward-reference will be altered into a real type. */
6480 ref
= make_node (code
);
6481 if (code
== ENUMERAL_TYPE
)
6483 /* Give the type a default layout like unsigned int
6484 to avoid crashing if it does not get defined. */
6485 SET_TYPE_MODE (ref
, TYPE_MODE (unsigned_type_node
));
6486 TYPE_ALIGN (ref
) = TYPE_ALIGN (unsigned_type_node
);
6487 TYPE_USER_ALIGN (ref
) = 0;
6488 TYPE_UNSIGNED (ref
) = 1;
6489 TYPE_PRECISION (ref
) = TYPE_PRECISION (unsigned_type_node
);
6490 TYPE_MIN_VALUE (ref
) = TYPE_MIN_VALUE (unsigned_type_node
);
6491 TYPE_MAX_VALUE (ref
) = TYPE_MAX_VALUE (unsigned_type_node
);
6494 pushtag (loc
, name
, ref
);
6500 /* Get the struct, enum or union (CODE says which) with tag NAME.
6501 Define the tag as a forward-reference if it is not defined.
6502 Return a tree for the type. */
6505 xref_tag (enum tree_code code
, tree name
)
6507 return parser_xref_tag (input_location
, code
, name
).spec
;
6510 /* Make sure that the tag NAME is defined *in the current scope*
6511 at least as a forward reference.
6512 LOC is the location of the struct's definition.
6513 CODE says which kind of tag NAME ought to be.
6515 This stores the current value of the file static STRUCT_PARSE_INFO
6516 in *ENCLOSING_STRUCT_PARSE_INFO, and points STRUCT_PARSE_INFO at a
6517 new c_struct_parse_info structure. The old value of
6518 STRUCT_PARSE_INFO is restored in finish_struct. */
6521 start_struct (location_t loc
, enum tree_code code
, tree name
,
6522 struct c_struct_parse_info
**enclosing_struct_parse_info
)
6524 /* If there is already a tag defined at this scope
6525 (as a forward reference), just return it. */
6527 tree ref
= NULL_TREE
;
6528 location_t refloc
= UNKNOWN_LOCATION
;
6530 if (name
!= NULL_TREE
)
6531 ref
= lookup_tag (code
, name
, 1, &refloc
);
6532 if (ref
&& TREE_CODE (ref
) == code
)
6534 if (TYPE_SIZE (ref
))
6536 if (code
== UNION_TYPE
)
6537 error_at (loc
, "redefinition of %<union %E%>", name
);
6539 error_at (loc
, "redefinition of %<struct %E%>", name
);
6540 if (refloc
!= UNKNOWN_LOCATION
)
6541 inform (refloc
, "originally defined here");
6542 /* Don't create structures using a name already in use. */
6545 else if (C_TYPE_BEING_DEFINED (ref
))
6547 if (code
== UNION_TYPE
)
6548 error_at (loc
, "nested redefinition of %<union %E%>", name
);
6550 error_at (loc
, "nested redefinition of %<struct %E%>", name
);
6551 /* Don't bother to report "originally defined here" for a
6552 nested redefinition; the original definition should be
6554 /* Don't create structures that contain themselves. */
6559 /* Otherwise create a forward-reference just so the tag is in scope. */
6561 if (ref
== NULL_TREE
|| TREE_CODE (ref
) != code
)
6563 ref
= make_node (code
);
6564 pushtag (loc
, name
, ref
);
6567 C_TYPE_BEING_DEFINED (ref
) = 1;
6568 TYPE_PACKED (ref
) = flag_pack_struct
;
6570 *enclosing_struct_parse_info
= struct_parse_info
;
6571 struct_parse_info
= XNEW (struct c_struct_parse_info
);
6572 struct_parse_info
->struct_types
= VEC_alloc (tree
, heap
, 0);
6573 struct_parse_info
->fields
= VEC_alloc (c_binding_ptr
, heap
, 0);
6574 struct_parse_info
->typedefs_seen
= VEC_alloc (tree
, heap
, 0);
6576 /* FIXME: This will issue a warning for a use of a type defined
6577 within a statement expr used within sizeof, et. al. This is not
6578 terribly serious as C++ doesn't permit statement exprs within
6580 if (warn_cxx_compat
&& (in_sizeof
|| in_typeof
|| in_alignof
))
6581 warning_at (loc
, OPT_Wc___compat
,
6582 "defining type in %qs expression is invalid in C++",
6585 : (in_typeof
? "typeof" : "alignof")));
6590 /* Process the specs, declarator and width (NULL if omitted)
6591 of a structure component, returning a FIELD_DECL node.
6592 WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node.
6593 DECL_ATTRS is as for grokdeclarator.
6595 LOC is the location of the structure component.
6597 This is done during the parsing of the struct declaration.
6598 The FIELD_DECL nodes are chained together and the lot of them
6599 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
6602 grokfield (location_t loc
,
6603 struct c_declarator
*declarator
, struct c_declspecs
*declspecs
,
6604 tree width
, tree
*decl_attrs
)
6608 if (declarator
->kind
== cdk_id
&& declarator
->u
.id
== NULL_TREE
6609 && width
== NULL_TREE
)
6611 /* This is an unnamed decl.
6613 If we have something of the form "union { list } ;" then this
6614 is the anonymous union extension. Similarly for struct.
6616 If this is something of the form "struct foo;", then
6617 If MS extensions are enabled, this is handled as an
6619 Otherwise this is a forward declaration of a structure tag.
6621 If this is something of the form "foo;" and foo is a TYPE_DECL, then
6622 If foo names a structure or union without a tag, then this
6623 is an anonymous struct (this is permitted by C1X).
6624 If MS extensions are enabled and foo names a structure, then
6625 again this is an anonymous struct.
6626 Otherwise this is an error.
6628 Oh what a horrid tangled web we weave. I wonder if MS consciously
6629 took this from Plan 9 or if it was an accident of implementation
6630 that took root before someone noticed the bug... */
6632 tree type
= declspecs
->type
;
6633 bool type_ok
= (TREE_CODE (type
) == RECORD_TYPE
6634 || TREE_CODE (type
) == UNION_TYPE
);
6639 if (flag_ms_extensions
)
6641 else if (TYPE_NAME (TYPE_MAIN_VARIANT (type
)) == NULL
)
6648 pedwarn (loc
, 0, "declaration does not declare anything");
6654 pedwarn (loc
, OPT_pedantic
,
6655 "ISO C99 doesn%'t support unnamed structs/unions");
6657 pedwarn (loc
, OPT_pedantic
,
6658 "ISO C90 doesn%'t support unnamed structs/unions");
6662 value
= grokdeclarator (declarator
, declspecs
, FIELD
, false,
6663 width
? &width
: NULL
, decl_attrs
, NULL
, NULL
,
6666 finish_decl (value
, loc
, NULL_TREE
, NULL_TREE
, NULL_TREE
);
6667 DECL_INITIAL (value
) = width
;
6669 if (warn_cxx_compat
&& DECL_NAME (value
) != NULL_TREE
)
6671 /* If we currently have a binding for this field, set the
6672 in_struct field in the binding, so that we warn about lookups
6674 struct c_binding
*b
= I_SYMBOL_BINDING (DECL_NAME (value
));
6677 /* If the in_struct field is not yet set, push it on a list
6678 to be cleared when this struct is finished. */
6681 VEC_safe_push (c_binding_ptr
, heap
,
6682 struct_parse_info
->fields
, b
);
6691 /* Subroutine of detect_field_duplicates: add the fields of FIELDLIST
6692 to HTAB, giving errors for any duplicates. */
6695 detect_field_duplicates_hash (tree fieldlist
, htab_t htab
)
6700 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
6701 if ((y
= DECL_NAME (x
)) != 0)
6703 slot
= htab_find_slot (htab
, y
, INSERT
);
6706 error ("duplicate member %q+D", x
);
6707 DECL_NAME (x
) = NULL_TREE
;
6711 else if (TREE_CODE (TREE_TYPE (x
)) == RECORD_TYPE
6712 || TREE_CODE (TREE_TYPE (x
)) == UNION_TYPE
)
6713 detect_field_duplicates_hash (TYPE_FIELDS (TREE_TYPE (x
)), htab
);
6716 /* Generate an error for any duplicate field names in FIELDLIST. Munge
6717 the list such that this does not present a problem later. */
6720 detect_field_duplicates (tree fieldlist
)
6725 /* If the struct is the list of instance variables of an Objective-C
6726 class, then we need to add all the instance variables of
6727 superclasses before checking for duplicates (since you can't have
6728 an instance variable in a subclass with the same name as an
6729 instance variable in a superclass). objc_get_interface_ivars()
6730 leaves fieldlist unchanged if we are not in this case, so in that
6731 case nothing changes compared to C.
6733 if (c_dialect_objc ())
6734 fieldlist
= objc_get_interface_ivars (fieldlist
);
6736 /* First, see if there are more than "a few" fields.
6737 This is trivially true if there are zero or one fields. */
6740 x
= DECL_CHAIN (fieldlist
);
6745 if (DECL_NAME (x
) == NULL_TREE
6746 && (TREE_CODE (TREE_TYPE (x
)) == RECORD_TYPE
6747 || TREE_CODE (TREE_TYPE (x
)) == UNION_TYPE
))
6750 } while (timeout
> 0 && x
);
6752 /* If there were "few" fields and no anonymous structures or unions,
6753 avoid the overhead of allocating a hash table. Instead just do
6754 the nested traversal thing. */
6757 for (x
= DECL_CHAIN (fieldlist
); x
; x
= DECL_CHAIN (x
))
6760 for (y
= fieldlist
; y
!= x
; y
= TREE_CHAIN (y
))
6761 if (DECL_NAME (y
) == DECL_NAME (x
))
6763 error ("duplicate member %q+D", x
);
6764 DECL_NAME (x
) = NULL_TREE
;
6770 htab_t htab
= htab_create (37, htab_hash_pointer
, htab_eq_pointer
, NULL
);
6772 detect_field_duplicates_hash (fieldlist
, htab
);
6777 /* Finish up struct info used by -Wc++-compat. */
6780 warn_cxx_compat_finish_struct (tree fieldlist
)
6784 struct c_binding
*b
;
6786 /* Set the C_TYPE_DEFINED_IN_STRUCT flag for each type defined in
6787 the current struct. We do this now at the end of the struct
6788 because the flag is used to issue visibility warnings, and we
6789 only want to issue those warnings if the type is referenced
6790 outside of the struct declaration. */
6791 FOR_EACH_VEC_ELT (tree
, struct_parse_info
->struct_types
, ix
, x
)
6792 C_TYPE_DEFINED_IN_STRUCT (x
) = 1;
6794 /* The TYPEDEFS_SEEN field of STRUCT_PARSE_INFO is a list of
6795 typedefs used when declaring fields in this struct. If the name
6796 of any of the fields is also a typedef name then the struct would
6797 not parse in C++, because the C++ lookup rules say that the
6798 typedef name would be looked up in the context of the struct, and
6799 would thus be the field rather than the typedef. */
6800 if (!VEC_empty (tree
, struct_parse_info
->typedefs_seen
)
6801 && fieldlist
!= NULL_TREE
)
6803 /* Use a pointer_set using the name of the typedef. We can use
6804 a pointer_set because identifiers are interned. */
6805 struct pointer_set_t
*tset
= pointer_set_create ();
6807 FOR_EACH_VEC_ELT (tree
, struct_parse_info
->typedefs_seen
, ix
, x
)
6808 pointer_set_insert (tset
, DECL_NAME (x
));
6810 for (x
= fieldlist
; x
!= NULL_TREE
; x
= DECL_CHAIN (x
))
6812 if (pointer_set_contains (tset
, DECL_NAME (x
)))
6814 warning_at (DECL_SOURCE_LOCATION (x
), OPT_Wc___compat
,
6815 ("using %qD as both field and typedef name is "
6818 /* FIXME: It would be nice to report the location where
6819 the typedef name is used. */
6823 pointer_set_destroy (tset
);
6826 /* For each field which has a binding and which was not defined in
6827 an enclosing struct, clear the in_struct field. */
6828 FOR_EACH_VEC_ELT (c_binding_ptr
, struct_parse_info
->fields
, ix
, b
)
6832 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
6833 LOC is the location of the RECORD_TYPE or UNION_TYPE's definition.
6834 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
6835 ATTRIBUTES are attributes to be applied to the structure.
6837 ENCLOSING_STRUCT_PARSE_INFO is the value of STRUCT_PARSE_INFO when
6838 the struct was started. */
6841 finish_struct (location_t loc
, tree t
, tree fieldlist
, tree attributes
,
6842 struct c_struct_parse_info
*enclosing_struct_parse_info
)
6845 bool toplevel
= file_scope
== current_scope
;
6846 int saw_named_field
;
6848 /* If this type was previously laid out as a forward reference,
6849 make sure we lay it out again. */
6853 decl_attributes (&t
, attributes
, (int) ATTR_FLAG_TYPE_IN_PLACE
);
6857 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
6859 if (DECL_NAME (x
) != 0)
6862 && (TREE_CODE (TREE_TYPE (x
)) == RECORD_TYPE
6863 || TREE_CODE (TREE_TYPE (x
)) == UNION_TYPE
))
6869 if (TREE_CODE (t
) == UNION_TYPE
)
6872 pedwarn (loc
, OPT_pedantic
, "union has no named members");
6874 pedwarn (loc
, OPT_pedantic
, "union has no members");
6879 pedwarn (loc
, OPT_pedantic
, "struct has no named members");
6881 pedwarn (loc
, OPT_pedantic
, "struct has no members");
6886 /* Install struct as DECL_CONTEXT of each field decl.
6887 Also process specified field sizes, found in the DECL_INITIAL,
6888 storing 0 there after the type has been changed to precision equal
6889 to its width, rather than the precision of the specified standard
6890 type. (Correct layout requires the original type to have been preserved
6893 saw_named_field
= 0;
6894 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
6896 if (TREE_TYPE (x
) == error_mark_node
)
6899 DECL_CONTEXT (x
) = t
;
6901 /* If any field is const, the structure type is pseudo-const. */
6902 if (TREE_READONLY (x
))
6903 C_TYPE_FIELDS_READONLY (t
) = 1;
6906 /* A field that is pseudo-const makes the structure likewise. */
6907 tree t1
= strip_array_types (TREE_TYPE (x
));
6908 if ((TREE_CODE (t1
) == RECORD_TYPE
|| TREE_CODE (t1
) == UNION_TYPE
)
6909 && C_TYPE_FIELDS_READONLY (t1
))
6910 C_TYPE_FIELDS_READONLY (t
) = 1;
6913 /* Any field that is volatile means variables of this type must be
6914 treated in some ways as volatile. */
6915 if (TREE_THIS_VOLATILE (x
))
6916 C_TYPE_FIELDS_VOLATILE (t
) = 1;
6918 /* Any field of nominal variable size implies structure is too. */
6919 if (C_DECL_VARIABLE_SIZE (x
))
6920 C_TYPE_VARIABLE_SIZE (t
) = 1;
6922 if (DECL_INITIAL (x
))
6924 unsigned HOST_WIDE_INT width
= tree_low_cst (DECL_INITIAL (x
), 1);
6925 DECL_SIZE (x
) = bitsize_int (width
);
6926 DECL_BIT_FIELD (x
) = 1;
6927 SET_DECL_C_BIT_FIELD (x
);
6931 && (DECL_BIT_FIELD (x
)
6932 || TYPE_ALIGN (TREE_TYPE (x
)) > BITS_PER_UNIT
))
6933 DECL_PACKED (x
) = 1;
6935 /* Detect flexible array member in an invalid context. */
6936 if (TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
6937 && TYPE_SIZE (TREE_TYPE (x
)) == NULL_TREE
6938 && TYPE_DOMAIN (TREE_TYPE (x
)) != NULL_TREE
6939 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x
))) == NULL_TREE
)
6941 if (TREE_CODE (t
) == UNION_TYPE
)
6943 error_at (DECL_SOURCE_LOCATION (x
),
6944 "flexible array member in union");
6945 TREE_TYPE (x
) = error_mark_node
;
6947 else if (DECL_CHAIN (x
) != NULL_TREE
)
6949 error_at (DECL_SOURCE_LOCATION (x
),
6950 "flexible array member not at end of struct");
6951 TREE_TYPE (x
) = error_mark_node
;
6953 else if (!saw_named_field
)
6955 error_at (DECL_SOURCE_LOCATION (x
),
6956 "flexible array member in otherwise empty struct");
6957 TREE_TYPE (x
) = error_mark_node
;
6961 if (pedantic
&& TREE_CODE (t
) == RECORD_TYPE
6962 && flexible_array_type_p (TREE_TYPE (x
)))
6963 pedwarn (DECL_SOURCE_LOCATION (x
), OPT_pedantic
,
6964 "invalid use of structure with flexible array member");
6967 || TREE_CODE (TREE_TYPE (x
)) == RECORD_TYPE
6968 || TREE_CODE (TREE_TYPE (x
)) == UNION_TYPE
)
6969 saw_named_field
= 1;
6972 detect_field_duplicates (fieldlist
);
6974 /* Now we have the nearly final fieldlist. Record it,
6975 then lay out the structure or union (including the fields). */
6977 TYPE_FIELDS (t
) = fieldlist
;
6981 /* Give bit-fields their proper types. */
6983 tree
*fieldlistp
= &fieldlist
;
6985 if (TREE_CODE (*fieldlistp
) == FIELD_DECL
&& DECL_INITIAL (*fieldlistp
)
6986 && TREE_TYPE (*fieldlistp
) != error_mark_node
)
6988 unsigned HOST_WIDE_INT width
6989 = tree_low_cst (DECL_INITIAL (*fieldlistp
), 1);
6990 tree type
= TREE_TYPE (*fieldlistp
);
6991 if (width
!= TYPE_PRECISION (type
))
6993 TREE_TYPE (*fieldlistp
)
6994 = c_build_bitfield_integer_type (width
, TYPE_UNSIGNED (type
));
6995 DECL_MODE (*fieldlistp
) = TYPE_MODE (TREE_TYPE (*fieldlistp
));
6997 DECL_INITIAL (*fieldlistp
) = 0;
7000 fieldlistp
= &DECL_CHAIN (*fieldlistp
);
7003 /* Now we have the truly final field list.
7004 Store it in this type and in the variants. */
7006 TYPE_FIELDS (t
) = fieldlist
;
7008 /* If there are lots of fields, sort so we can look through them fast.
7009 We arbitrarily consider 16 or more elts to be "a lot". */
7014 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
7016 if (len
> 15 || DECL_NAME (x
) == NULL
)
7024 struct lang_type
*space
;
7025 struct sorted_fields_type
*space2
;
7027 len
+= list_length (x
);
7029 /* Use the same allocation policy here that make_node uses, to
7030 ensure that this lives as long as the rest of the struct decl.
7031 All decls in an inline function need to be saved. */
7033 space
= ggc_alloc_cleared_lang_type (sizeof (struct lang_type
));
7034 space2
= ggc_alloc_sorted_fields_type
7035 (sizeof (struct sorted_fields_type
) + len
* sizeof (tree
));
7039 field_array
= &space2
->elts
[0];
7040 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
7042 field_array
[len
++] = x
;
7044 /* If there is anonymous struct or union, break out of the loop. */
7045 if (DECL_NAME (x
) == NULL
)
7048 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
7051 TYPE_LANG_SPECIFIC (t
) = space
;
7052 TYPE_LANG_SPECIFIC (t
)->s
->len
= len
;
7053 field_array
= TYPE_LANG_SPECIFIC (t
)->s
->elts
;
7054 qsort (field_array
, len
, sizeof (tree
), field_decl_cmp
);
7059 for (x
= TYPE_MAIN_VARIANT (t
); x
; x
= TYPE_NEXT_VARIANT (x
))
7061 TYPE_FIELDS (x
) = TYPE_FIELDS (t
);
7062 TYPE_LANG_SPECIFIC (x
) = TYPE_LANG_SPECIFIC (t
);
7063 C_TYPE_FIELDS_READONLY (x
) = C_TYPE_FIELDS_READONLY (t
);
7064 C_TYPE_FIELDS_VOLATILE (x
) = C_TYPE_FIELDS_VOLATILE (t
);
7065 C_TYPE_VARIABLE_SIZE (x
) = C_TYPE_VARIABLE_SIZE (t
);
7068 /* If this was supposed to be a transparent union, but we can't
7069 make it one, warn and turn off the flag. */
7070 if (TREE_CODE (t
) == UNION_TYPE
7071 && TYPE_TRANSPARENT_AGGR (t
)
7072 && (!TYPE_FIELDS (t
) || TYPE_MODE (t
) != DECL_MODE (TYPE_FIELDS (t
))))
7074 TYPE_TRANSPARENT_AGGR (t
) = 0;
7075 warning_at (loc
, 0, "union cannot be made transparent");
7078 /* If this structure or union completes the type of any previous
7079 variable declaration, lay it out and output its rtl. */
7080 for (x
= C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t
));
7084 tree decl
= TREE_VALUE (x
);
7085 if (TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
)
7086 layout_array_type (TREE_TYPE (decl
));
7087 if (TREE_CODE (decl
) != TYPE_DECL
)
7089 layout_decl (decl
, 0);
7090 if (c_dialect_objc ())
7091 objc_check_decl (decl
);
7092 rest_of_decl_compilation (decl
, toplevel
, 0);
7097 C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t
)) = 0;
7099 /* Update type location to the one of the definition, instead of e.g.
7100 a forward declaration. */
7101 if (TYPE_STUB_DECL (t
))
7102 DECL_SOURCE_LOCATION (TYPE_STUB_DECL (t
)) = loc
;
7104 /* Finish debugging output for this type. */
7105 rest_of_type_compilation (t
, toplevel
);
7107 /* If we're inside a function proper, i.e. not file-scope and not still
7108 parsing parameters, then arrange for the size of a variable sized type
7110 if (cur_stmt_list
&& variably_modified_type_p (t
, NULL_TREE
))
7111 add_stmt (build_stmt (loc
,
7112 DECL_EXPR
, build_decl (loc
, TYPE_DECL
, NULL
, t
)));
7114 if (warn_cxx_compat
)
7115 warn_cxx_compat_finish_struct (fieldlist
);
7117 VEC_free (tree
, heap
, struct_parse_info
->struct_types
);
7118 VEC_free (c_binding_ptr
, heap
, struct_parse_info
->fields
);
7119 VEC_free (tree
, heap
, struct_parse_info
->typedefs_seen
);
7120 XDELETE (struct_parse_info
);
7122 struct_parse_info
= enclosing_struct_parse_info
;
7124 /* If this struct is defined inside a struct, add it to
7127 && struct_parse_info
!= NULL
7128 && !in_sizeof
&& !in_typeof
&& !in_alignof
)
7129 VEC_safe_push (tree
, heap
, struct_parse_info
->struct_types
, t
);
7134 /* Lay out the type T, and its element type, and so on. */
7137 layout_array_type (tree t
)
7139 if (TREE_CODE (TREE_TYPE (t
)) == ARRAY_TYPE
)
7140 layout_array_type (TREE_TYPE (t
));
7144 /* Begin compiling the definition of an enumeration type.
7145 NAME is its name (or null if anonymous).
7146 LOC is the enum's location.
7147 Returns the type object, as yet incomplete.
7148 Also records info about it so that build_enumerator
7149 may be used to declare the individual values as they are read. */
7152 start_enum (location_t loc
, struct c_enum_contents
*the_enum
, tree name
)
7154 tree enumtype
= NULL_TREE
;
7155 location_t enumloc
= UNKNOWN_LOCATION
;
7157 /* If this is the real definition for a previous forward reference,
7158 fill in the contents in the same object that used to be the
7159 forward reference. */
7161 if (name
!= NULL_TREE
)
7162 enumtype
= lookup_tag (ENUMERAL_TYPE
, name
, 1, &enumloc
);
7164 if (enumtype
== 0 || TREE_CODE (enumtype
) != ENUMERAL_TYPE
)
7166 enumtype
= make_node (ENUMERAL_TYPE
);
7167 pushtag (loc
, name
, enumtype
);
7170 if (C_TYPE_BEING_DEFINED (enumtype
))
7171 error_at (loc
, "nested redefinition of %<enum %E%>", name
);
7173 C_TYPE_BEING_DEFINED (enumtype
) = 1;
7175 if (TYPE_VALUES (enumtype
) != 0)
7177 /* This enum is a named one that has been declared already. */
7178 error_at (loc
, "redeclaration of %<enum %E%>", name
);
7179 if (enumloc
!= UNKNOWN_LOCATION
)
7180 inform (enumloc
, "originally defined here");
7182 /* Completely replace its old definition.
7183 The old enumerators remain defined, however. */
7184 TYPE_VALUES (enumtype
) = 0;
7187 the_enum
->enum_next_value
= integer_zero_node
;
7188 the_enum
->enum_overflow
= 0;
7190 if (flag_short_enums
)
7191 TYPE_PACKED (enumtype
) = 1;
7193 /* FIXME: This will issue a warning for a use of a type defined
7194 within sizeof in a statement expr. This is not terribly serious
7195 as C++ doesn't permit statement exprs within sizeof anyhow. */
7196 if (warn_cxx_compat
&& (in_sizeof
|| in_typeof
|| in_alignof
))
7197 warning_at (loc
, OPT_Wc___compat
,
7198 "defining type in %qs expression is invalid in C++",
7201 : (in_typeof
? "typeof" : "alignof")));
7206 /* After processing and defining all the values of an enumeration type,
7207 install their decls in the enumeration type and finish it off.
7208 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
7209 and ATTRIBUTES are the specified attributes.
7210 Returns ENUMTYPE. */
7213 finish_enum (tree enumtype
, tree values
, tree attributes
)
7216 tree minnode
= 0, maxnode
= 0;
7217 int precision
, unsign
;
7218 bool toplevel
= (file_scope
== current_scope
);
7219 struct lang_type
*lt
;
7221 decl_attributes (&enumtype
, attributes
, (int) ATTR_FLAG_TYPE_IN_PLACE
);
7223 /* Calculate the maximum value of any enumerator in this type. */
7225 if (values
== error_mark_node
)
7226 minnode
= maxnode
= integer_zero_node
;
7229 minnode
= maxnode
= TREE_VALUE (values
);
7230 for (pair
= TREE_CHAIN (values
); pair
; pair
= TREE_CHAIN (pair
))
7232 tree value
= TREE_VALUE (pair
);
7233 if (tree_int_cst_lt (maxnode
, value
))
7235 if (tree_int_cst_lt (value
, minnode
))
7240 /* Construct the final type of this enumeration. It is the same
7241 as one of the integral types - the narrowest one that fits, except
7242 that normally we only go as narrow as int - and signed iff any of
7243 the values are negative. */
7244 unsign
= (tree_int_cst_sgn (minnode
) >= 0);
7245 precision
= MAX (tree_int_cst_min_precision (minnode
, unsign
),
7246 tree_int_cst_min_precision (maxnode
, unsign
));
7248 if (TYPE_PACKED (enumtype
) || precision
> TYPE_PRECISION (integer_type_node
))
7250 tem
= c_common_type_for_size (precision
, unsign
);
7253 warning (0, "enumeration values exceed range of largest integer");
7254 tem
= long_long_integer_type_node
;
7258 tem
= unsign
? unsigned_type_node
: integer_type_node
;
7260 TYPE_MIN_VALUE (enumtype
) = TYPE_MIN_VALUE (tem
);
7261 TYPE_MAX_VALUE (enumtype
) = TYPE_MAX_VALUE (tem
);
7262 TYPE_UNSIGNED (enumtype
) = TYPE_UNSIGNED (tem
);
7263 TYPE_SIZE (enumtype
) = 0;
7265 /* If the precision of the type was specific with an attribute and it
7266 was too small, give an error. Otherwise, use it. */
7267 if (TYPE_PRECISION (enumtype
))
7269 if (precision
> TYPE_PRECISION (enumtype
))
7270 error ("specified mode too small for enumeral values");
7273 TYPE_PRECISION (enumtype
) = TYPE_PRECISION (tem
);
7275 layout_type (enumtype
);
7277 if (values
!= error_mark_node
)
7279 /* Change the type of the enumerators to be the enum type. We
7280 need to do this irrespective of the size of the enum, for
7281 proper type checking. Replace the DECL_INITIALs of the
7282 enumerators, and the value slots of the list, with copies
7283 that have the enum type; they cannot be modified in place
7284 because they may be shared (e.g. integer_zero_node) Finally,
7285 change the purpose slots to point to the names of the decls. */
7286 for (pair
= values
; pair
; pair
= TREE_CHAIN (pair
))
7288 tree enu
= TREE_PURPOSE (pair
);
7289 tree ini
= DECL_INITIAL (enu
);
7291 TREE_TYPE (enu
) = enumtype
;
7293 /* The ISO C Standard mandates enumerators to have type int,
7294 even though the underlying type of an enum type is
7295 unspecified. However, GCC allows enumerators of any
7296 integer type as an extensions. build_enumerator()
7297 converts any enumerators that fit in an int to type int,
7298 to avoid promotions to unsigned types when comparing
7299 integers with enumerators that fit in the int range.
7300 When -pedantic is given, build_enumerator() would have
7301 already warned about those that don't fit. Here we
7302 convert the rest to the enumerator type. */
7303 if (TREE_TYPE (ini
) != integer_type_node
)
7304 ini
= convert (enumtype
, ini
);
7306 DECL_INITIAL (enu
) = ini
;
7307 TREE_PURPOSE (pair
) = DECL_NAME (enu
);
7308 TREE_VALUE (pair
) = ini
;
7311 TYPE_VALUES (enumtype
) = values
;
7314 /* Record the min/max values so that we can warn about bit-field
7315 enumerations that are too small for the values. */
7316 lt
= ggc_alloc_cleared_lang_type (sizeof (struct lang_type
));
7317 lt
->enum_min
= minnode
;
7318 lt
->enum_max
= maxnode
;
7319 TYPE_LANG_SPECIFIC (enumtype
) = lt
;
7321 /* Fix up all variant types of this enum type. */
7322 for (tem
= TYPE_MAIN_VARIANT (enumtype
); tem
; tem
= TYPE_NEXT_VARIANT (tem
))
7324 if (tem
== enumtype
)
7326 TYPE_VALUES (tem
) = TYPE_VALUES (enumtype
);
7327 TYPE_MIN_VALUE (tem
) = TYPE_MIN_VALUE (enumtype
);
7328 TYPE_MAX_VALUE (tem
) = TYPE_MAX_VALUE (enumtype
);
7329 TYPE_SIZE (tem
) = TYPE_SIZE (enumtype
);
7330 TYPE_SIZE_UNIT (tem
) = TYPE_SIZE_UNIT (enumtype
);
7331 SET_TYPE_MODE (tem
, TYPE_MODE (enumtype
));
7332 TYPE_PRECISION (tem
) = TYPE_PRECISION (enumtype
);
7333 TYPE_ALIGN (tem
) = TYPE_ALIGN (enumtype
);
7334 TYPE_USER_ALIGN (tem
) = TYPE_USER_ALIGN (enumtype
);
7335 TYPE_UNSIGNED (tem
) = TYPE_UNSIGNED (enumtype
);
7336 TYPE_LANG_SPECIFIC (tem
) = TYPE_LANG_SPECIFIC (enumtype
);
7339 /* Finish debugging output for this type. */
7340 rest_of_type_compilation (enumtype
, toplevel
);
7342 /* If this enum is defined inside a struct, add it to
7345 && struct_parse_info
!= NULL
7346 && !in_sizeof
&& !in_typeof
&& !in_alignof
)
7347 VEC_safe_push (tree
, heap
, struct_parse_info
->struct_types
, enumtype
);
7352 /* Build and install a CONST_DECL for one value of the
7353 current enumeration type (one that was begun with start_enum).
7354 DECL_LOC is the location of the enumerator.
7355 LOC is the location of the '=' operator if any, DECL_LOC otherwise.
7356 Return a tree-list containing the CONST_DECL and its value.
7357 Assignment of sequential values by default is handled here. */
7360 build_enumerator (location_t decl_loc
, location_t loc
,
7361 struct c_enum_contents
*the_enum
, tree name
, tree value
)
7365 /* Validate and default VALUE. */
7369 /* Don't issue more errors for error_mark_node (i.e. an
7370 undeclared identifier) - just ignore the value expression. */
7371 if (value
== error_mark_node
)
7373 else if (!INTEGRAL_TYPE_P (TREE_TYPE (value
)))
7375 error_at (loc
, "enumerator value for %qE is not an integer constant",
7381 if (TREE_CODE (value
) != INTEGER_CST
)
7383 value
= c_fully_fold (value
, false, NULL
);
7384 if (TREE_CODE (value
) == INTEGER_CST
)
7385 pedwarn (loc
, OPT_pedantic
,
7386 "enumerator value for %qE is not an integer "
7387 "constant expression", name
);
7389 if (TREE_CODE (value
) != INTEGER_CST
)
7391 error ("enumerator value for %qE is not an integer constant",
7397 value
= default_conversion (value
);
7398 constant_expression_warning (value
);
7403 /* Default based on previous value. */
7404 /* It should no longer be possible to have NON_LVALUE_EXPR
7408 value
= the_enum
->enum_next_value
;
7409 if (the_enum
->enum_overflow
)
7410 error_at (loc
, "overflow in enumeration values");
7412 /* Even though the underlying type of an enum is unspecified, the
7413 type of enumeration constants is explicitly defined as int
7414 (6.4.4.3/2 in the C99 Standard). GCC allows any integer type as
7416 else if (!int_fits_type_p (value
, integer_type_node
))
7417 pedwarn (loc
, OPT_pedantic
,
7418 "ISO C restricts enumerator values to range of %<int%>");
7420 /* The ISO C Standard mandates enumerators to have type int, even
7421 though the underlying type of an enum type is unspecified.
7422 However, GCC allows enumerators of any integer type as an
7423 extensions. Here we convert any enumerators that fit in an int
7424 to type int, to avoid promotions to unsigned types when comparing
7425 integers with enumerators that fit in the int range. When
7426 -pedantic is given, we would have already warned about those that
7427 don't fit. We have to do this here rather than in finish_enum
7428 because this value may be used to define more enumerators. */
7429 if (int_fits_type_p (value
, integer_type_node
))
7430 value
= convert (integer_type_node
, value
);
7432 /* Set basis for default for next value. */
7433 the_enum
->enum_next_value
7435 (EXPR_HAS_LOCATION (value
) ? EXPR_LOCATION (value
) : input_location
,
7436 PLUS_EXPR
, value
, integer_one_node
, 0);
7437 the_enum
->enum_overflow
= tree_int_cst_lt (the_enum
->enum_next_value
, value
);
7439 /* Now create a declaration for the enum value name. */
7441 type
= TREE_TYPE (value
);
7442 type
= c_common_type_for_size (MAX (TYPE_PRECISION (type
),
7443 TYPE_PRECISION (integer_type_node
)),
7444 (TYPE_PRECISION (type
)
7445 >= TYPE_PRECISION (integer_type_node
)
7446 && TYPE_UNSIGNED (type
)));
7448 decl
= build_decl (decl_loc
, CONST_DECL
, name
, type
);
7449 DECL_INITIAL (decl
) = convert (type
, value
);
7452 return tree_cons (decl
, value
, NULL_TREE
);
7456 /* Create the FUNCTION_DECL for a function definition.
7457 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
7458 the declaration; they describe the function's name and the type it returns,
7459 but twisted together in a fashion that parallels the syntax of C.
7461 This function creates a binding context for the function body
7462 as well as setting up the FUNCTION_DECL in current_function_decl.
7464 Returns 1 on success. If the DECLARATOR is not suitable for a function
7465 (it defines a datum instead), we return 0, which tells
7466 yyparse to report a parse error. */
7469 start_function (struct c_declspecs
*declspecs
, struct c_declarator
*declarator
,
7472 tree decl1
, old_decl
;
7473 tree restype
, resdecl
;
7476 current_function_returns_value
= 0; /* Assume, until we see it does. */
7477 current_function_returns_null
= 0;
7478 current_function_returns_abnormally
= 0;
7479 warn_about_return_type
= 0;
7480 c_switch_stack
= NULL
;
7482 /* Indicate no valid break/continue context by setting these variables
7483 to some non-null, non-label value. We'll notice and emit the proper
7484 error message in c_finish_bc_stmt. */
7485 c_break_label
= c_cont_label
= size_zero_node
;
7487 decl1
= grokdeclarator (declarator
, declspecs
, FUNCDEF
, true, NULL
,
7488 &attributes
, NULL
, NULL
, DEPRECATED_NORMAL
);
7490 /* If the declarator is not suitable for a function definition,
7491 cause a syntax error. */
7495 loc
= DECL_SOURCE_LOCATION (decl1
);
7497 decl_attributes (&decl1
, attributes
, 0);
7499 if (DECL_DECLARED_INLINE_P (decl1
)
7500 && DECL_UNINLINABLE (decl1
)
7501 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1
)))
7502 warning_at (loc
, OPT_Wattributes
,
7503 "inline function %qD given attribute noinline",
7506 /* Handle gnu_inline attribute. */
7507 if (declspecs
->inline_p
7508 && !flag_gnu89_inline
7509 && TREE_CODE (decl1
) == FUNCTION_DECL
7510 && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl1
))
7511 || current_function_decl
))
7513 if (declspecs
->storage_class
!= csc_static
)
7514 DECL_EXTERNAL (decl1
) = !DECL_EXTERNAL (decl1
);
7517 announce_function (decl1
);
7519 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1
))))
7521 error_at (loc
, "return type is an incomplete type");
7522 /* Make it return void instead. */
7524 = build_function_type (void_type_node
,
7525 TYPE_ARG_TYPES (TREE_TYPE (decl1
)));
7528 if (warn_about_return_type
)
7529 pedwarn_c99 (loc
, flag_isoc99
? 0
7530 : (warn_return_type
? OPT_Wreturn_type
: OPT_Wimplicit_int
),
7531 "return type defaults to %<int%>");
7533 /* Make the init_value nonzero so pushdecl knows this is not tentative.
7534 error_mark_node is replaced below (in pop_scope) with the BLOCK. */
7535 DECL_INITIAL (decl1
) = error_mark_node
;
7537 /* A nested function is not global. */
7538 if (current_function_decl
!= 0)
7539 TREE_PUBLIC (decl1
) = 0;
7541 /* If this definition isn't a prototype and we had a prototype declaration
7542 before, copy the arg type info from that prototype. */
7543 old_decl
= lookup_name_in_scope (DECL_NAME (decl1
), current_scope
);
7544 if (old_decl
&& TREE_CODE (old_decl
) != FUNCTION_DECL
)
7546 current_function_prototype_locus
= UNKNOWN_LOCATION
;
7547 current_function_prototype_built_in
= false;
7548 current_function_prototype_arg_types
= NULL_TREE
;
7549 if (TYPE_ARG_TYPES (TREE_TYPE (decl1
)) == 0)
7551 if (old_decl
!= 0 && TREE_CODE (TREE_TYPE (old_decl
)) == FUNCTION_TYPE
7552 && comptypes (TREE_TYPE (TREE_TYPE (decl1
)),
7553 TREE_TYPE (TREE_TYPE (old_decl
))))
7555 TREE_TYPE (decl1
) = composite_type (TREE_TYPE (old_decl
),
7557 current_function_prototype_locus
= DECL_SOURCE_LOCATION (old_decl
);
7558 current_function_prototype_built_in
7559 = C_DECL_BUILTIN_PROTOTYPE (old_decl
);
7560 current_function_prototype_arg_types
7561 = TYPE_ARG_TYPES (TREE_TYPE (decl1
));
7563 if (TREE_PUBLIC (decl1
))
7565 /* If there is an external prototype declaration of this
7566 function, record its location but do not copy information
7567 to this decl. This may be an invisible declaration
7568 (built-in or in a scope which has finished) or simply
7569 have more refined argument types than any declaration
7571 struct c_binding
*b
;
7572 for (b
= I_SYMBOL_BINDING (DECL_NAME (decl1
)); b
; b
= b
->shadowed
)
7573 if (B_IN_SCOPE (b
, external_scope
))
7577 tree ext_decl
, ext_type
;
7579 ext_type
= b
->u
.type
? b
->u
.type
: TREE_TYPE (ext_decl
);
7580 if (TREE_CODE (ext_type
) == FUNCTION_TYPE
7581 && comptypes (TREE_TYPE (TREE_TYPE (decl1
)),
7582 TREE_TYPE (ext_type
)))
7584 current_function_prototype_locus
7585 = DECL_SOURCE_LOCATION (ext_decl
);
7586 current_function_prototype_built_in
7587 = C_DECL_BUILTIN_PROTOTYPE (ext_decl
);
7588 current_function_prototype_arg_types
7589 = TYPE_ARG_TYPES (ext_type
);
7595 /* Optionally warn of old-fashioned def with no previous prototype. */
7596 if (warn_strict_prototypes
7597 && old_decl
!= error_mark_node
7598 && TYPE_ARG_TYPES (TREE_TYPE (decl1
)) == 0
7599 && C_DECL_ISNT_PROTOTYPE (old_decl
))
7600 warning_at (loc
, OPT_Wstrict_prototypes
,
7601 "function declaration isn%'t a prototype");
7602 /* Optionally warn of any global def with no previous prototype. */
7603 else if (warn_missing_prototypes
7604 && old_decl
!= error_mark_node
7605 && TREE_PUBLIC (decl1
)
7606 && !MAIN_NAME_P (DECL_NAME (decl1
))
7607 && C_DECL_ISNT_PROTOTYPE (old_decl
))
7608 warning_at (loc
, OPT_Wmissing_prototypes
,
7609 "no previous prototype for %qD", decl1
);
7610 /* Optionally warn of any def with no previous prototype
7611 if the function has already been used. */
7612 else if (warn_missing_prototypes
7614 && old_decl
!= error_mark_node
7615 && TREE_USED (old_decl
)
7616 && TYPE_ARG_TYPES (TREE_TYPE (old_decl
)) == 0)
7617 warning_at (loc
, OPT_Wmissing_prototypes
,
7618 "%qD was used with no prototype before its definition", decl1
);
7619 /* Optionally warn of any global def with no previous declaration. */
7620 else if (warn_missing_declarations
7621 && TREE_PUBLIC (decl1
)
7623 && !MAIN_NAME_P (DECL_NAME (decl1
)))
7624 warning_at (loc
, OPT_Wmissing_declarations
,
7625 "no previous declaration for %qD",
7627 /* Optionally warn of any def with no previous declaration
7628 if the function has already been used. */
7629 else if (warn_missing_declarations
7631 && old_decl
!= error_mark_node
7632 && TREE_USED (old_decl
)
7633 && C_DECL_IMPLICIT (old_decl
))
7634 warning_at (loc
, OPT_Wmissing_declarations
,
7635 "%qD was used with no declaration before its definition", decl1
);
7637 /* This function exists in static storage.
7638 (This does not mean `static' in the C sense!) */
7639 TREE_STATIC (decl1
) = 1;
7641 /* This is the earliest point at which we might know the assembler
7642 name of the function. Thus, if it's set before this, die horribly. */
7643 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl1
));
7645 /* If #pragma weak was used, mark the decl weak now. */
7646 if (current_scope
== file_scope
)
7647 maybe_apply_pragma_weak (decl1
);
7649 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
7650 if (warn_main
&& MAIN_NAME_P (DECL_NAME (decl1
)))
7652 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1
)))
7653 != integer_type_node
)
7654 pedwarn (loc
, OPT_Wmain
, "return type of %qD is not %<int%>", decl1
);
7656 check_main_parameter_types (decl1
);
7658 if (!TREE_PUBLIC (decl1
))
7659 pedwarn (loc
, OPT_Wmain
,
7660 "%qD is normally a non-static function", decl1
);
7663 /* Record the decl so that the function name is defined.
7664 If we already have a decl for this name, and it is a FUNCTION_DECL,
7665 use the old decl. */
7667 current_function_decl
= pushdecl (decl1
);
7670 declare_parm_level ();
7672 restype
= TREE_TYPE (TREE_TYPE (current_function_decl
));
7673 resdecl
= build_decl (loc
, RESULT_DECL
, NULL_TREE
, restype
);
7674 DECL_ARTIFICIAL (resdecl
) = 1;
7675 DECL_IGNORED_P (resdecl
) = 1;
7676 DECL_RESULT (current_function_decl
) = resdecl
;
7678 start_fname_decls ();
7683 /* Subroutine of store_parm_decls which handles new-style function
7684 definitions (prototype format). The parms already have decls, so we
7685 need only record them as in effect and complain if any redundant
7686 old-style parm decls were written. */
7688 store_parm_decls_newstyle (tree fndecl
, const struct c_arg_info
*arg_info
)
7694 if (current_scope
->bindings
)
7696 error_at (DECL_SOURCE_LOCATION (fndecl
),
7697 "old-style parameter declarations in prototyped "
7698 "function definition");
7700 /* Get rid of the old-style declarations. */
7704 /* Don't issue this warning for nested functions, and don't issue this
7705 warning if we got here because ARG_INFO_TYPES was error_mark_node
7706 (this happens when a function definition has just an ellipsis in
7707 its parameter list). */
7708 else if (!in_system_header
&& !current_function_scope
7709 && arg_info
->types
!= error_mark_node
)
7710 warning_at (DECL_SOURCE_LOCATION (fndecl
), OPT_Wtraditional
,
7711 "traditional C rejects ISO C style function definitions");
7713 /* Now make all the parameter declarations visible in the function body.
7714 We can bypass most of the grunt work of pushdecl. */
7715 for (decl
= arg_info
->parms
; decl
; decl
= DECL_CHAIN (decl
))
7717 DECL_CONTEXT (decl
) = current_function_decl
;
7718 if (DECL_NAME (decl
))
7720 bind (DECL_NAME (decl
), decl
, current_scope
,
7721 /*invisible=*/false, /*nested=*/false,
7723 if (!TREE_USED (decl
))
7724 warn_if_shadowing (decl
);
7727 error_at (DECL_SOURCE_LOCATION (decl
), "parameter name omitted");
7730 /* Record the parameter list in the function declaration. */
7731 DECL_ARGUMENTS (fndecl
) = arg_info
->parms
;
7733 /* Now make all the ancillary declarations visible, likewise. */
7734 for (decl
= arg_info
->others
; decl
; decl
= DECL_CHAIN (decl
))
7736 DECL_CONTEXT (decl
) = current_function_decl
;
7737 if (DECL_NAME (decl
))
7738 bind (DECL_NAME (decl
), decl
, current_scope
,
7739 /*invisible=*/false,
7740 /*nested=*/(TREE_CODE (decl
) == FUNCTION_DECL
),
7744 /* And all the tag declarations. */
7745 FOR_EACH_VEC_ELT_REVERSE (c_arg_tag
, arg_info
->tags
, ix
, tag
)
7747 bind (tag
->id
, tag
->type
, current_scope
,
7748 /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION
);
7751 /* Subroutine of store_parm_decls which handles old-style function
7752 definitions (separate parameter list and declarations). */
7755 store_parm_decls_oldstyle (tree fndecl
, const struct c_arg_info
*arg_info
)
7757 struct c_binding
*b
;
7758 tree parm
, decl
, last
;
7759 tree parmids
= arg_info
->parms
;
7760 struct pointer_set_t
*seen_args
= pointer_set_create ();
7762 if (!in_system_header
)
7763 warning_at (DECL_SOURCE_LOCATION (fndecl
),
7764 OPT_Wold_style_definition
, "old-style function definition");
7766 /* Match each formal parameter name with its declaration. Save each
7767 decl in the appropriate TREE_PURPOSE slot of the parmids chain. */
7768 for (parm
= parmids
; parm
; parm
= TREE_CHAIN (parm
))
7770 if (TREE_VALUE (parm
) == 0)
7772 error_at (DECL_SOURCE_LOCATION (fndecl
),
7773 "parameter name missing from parameter list");
7774 TREE_PURPOSE (parm
) = 0;
7778 b
= I_SYMBOL_BINDING (TREE_VALUE (parm
));
7779 if (b
&& B_IN_CURRENT_SCOPE (b
))
7782 /* If we got something other than a PARM_DECL it is an error. */
7783 if (TREE_CODE (decl
) != PARM_DECL
)
7784 error_at (DECL_SOURCE_LOCATION (decl
),
7785 "%qD declared as a non-parameter", decl
);
7786 /* If the declaration is already marked, we have a duplicate
7787 name. Complain and ignore the duplicate. */
7788 else if (pointer_set_contains (seen_args
, decl
))
7790 error_at (DECL_SOURCE_LOCATION (decl
),
7791 "multiple parameters named %qD", decl
);
7792 TREE_PURPOSE (parm
) = 0;
7795 /* If the declaration says "void", complain and turn it into
7797 else if (VOID_TYPE_P (TREE_TYPE (decl
)))
7799 error_at (DECL_SOURCE_LOCATION (decl
),
7800 "parameter %qD declared with void type", decl
);
7801 TREE_TYPE (decl
) = integer_type_node
;
7802 DECL_ARG_TYPE (decl
) = integer_type_node
;
7803 layout_decl (decl
, 0);
7805 warn_if_shadowing (decl
);
7807 /* If no declaration found, default to int. */
7810 /* FIXME diagnostics: This should be the location of the argument,
7811 not the FNDECL. E.g., for an old-style declaration
7813 int f10(v) { blah; }
7815 We should use the location of the V, not the F10.
7816 Unfortunately, the V is an IDENTIFIER_NODE which has no
7817 location. In the future we need locations for c_arg_info
7820 See gcc.dg/Wshadow-3.c for an example of this problem. */
7821 decl
= build_decl (DECL_SOURCE_LOCATION (fndecl
),
7822 PARM_DECL
, TREE_VALUE (parm
), integer_type_node
);
7823 DECL_ARG_TYPE (decl
) = TREE_TYPE (decl
);
7825 warn_if_shadowing (decl
);
7828 pedwarn (DECL_SOURCE_LOCATION (decl
),
7829 0, "type of %qD defaults to %<int%>", decl
);
7831 warning_at (DECL_SOURCE_LOCATION (decl
),
7832 OPT_Wmissing_parameter_type
,
7833 "type of %qD defaults to %<int%>", decl
);
7836 TREE_PURPOSE (parm
) = decl
;
7837 pointer_set_insert (seen_args
, decl
);
7840 /* Now examine the parms chain for incomplete declarations
7841 and declarations with no corresponding names. */
7843 for (b
= current_scope
->bindings
; b
; b
= b
->prev
)
7846 if (TREE_CODE (parm
) != PARM_DECL
)
7849 if (TREE_TYPE (parm
) != error_mark_node
7850 && !COMPLETE_TYPE_P (TREE_TYPE (parm
)))
7852 error_at (DECL_SOURCE_LOCATION (parm
),
7853 "parameter %qD has incomplete type", parm
);
7854 TREE_TYPE (parm
) = error_mark_node
;
7857 if (!pointer_set_contains (seen_args
, parm
))
7859 error_at (DECL_SOURCE_LOCATION (parm
),
7860 "declaration for parameter %qD but no such parameter",
7863 /* Pretend the parameter was not missing.
7864 This gets us to a standard state and minimizes
7865 further error messages. */
7866 parmids
= chainon (parmids
, tree_cons (parm
, 0, 0));
7870 /* Chain the declarations together in the order of the list of
7871 names. Store that chain in the function decl, replacing the
7872 list of names. Update the current scope to match. */
7873 DECL_ARGUMENTS (fndecl
) = 0;
7875 for (parm
= parmids
; parm
; parm
= TREE_CHAIN (parm
))
7876 if (TREE_PURPOSE (parm
))
7878 if (parm
&& TREE_PURPOSE (parm
))
7880 last
= TREE_PURPOSE (parm
);
7881 DECL_ARGUMENTS (fndecl
) = last
;
7883 for (parm
= TREE_CHAIN (parm
); parm
; parm
= TREE_CHAIN (parm
))
7884 if (TREE_PURPOSE (parm
))
7886 DECL_CHAIN (last
) = TREE_PURPOSE (parm
);
7887 last
= TREE_PURPOSE (parm
);
7889 DECL_CHAIN (last
) = 0;
7892 pointer_set_destroy (seen_args
);
7894 /* If there was a previous prototype,
7895 set the DECL_ARG_TYPE of each argument according to
7896 the type previously specified, and report any mismatches. */
7898 if (current_function_prototype_arg_types
)
7901 for (parm
= DECL_ARGUMENTS (fndecl
),
7902 type
= current_function_prototype_arg_types
;
7903 parm
|| (type
&& TREE_VALUE (type
) != error_mark_node
7904 && (TYPE_MAIN_VARIANT (TREE_VALUE (type
)) != void_type_node
));
7905 parm
= DECL_CHAIN (parm
), type
= TREE_CHAIN (type
))
7907 if (parm
== 0 || type
== 0
7908 || TYPE_MAIN_VARIANT (TREE_VALUE (type
)) == void_type_node
)
7910 if (current_function_prototype_built_in
)
7911 warning_at (DECL_SOURCE_LOCATION (fndecl
),
7912 0, "number of arguments doesn%'t match "
7913 "built-in prototype");
7916 /* FIXME diagnostics: This should be the location of
7917 FNDECL, but there is bug when a prototype is
7918 declared inside function context, but defined
7919 outside of it (e.g., gcc.dg/pr15698-2.c). In
7920 which case FNDECL gets the location of the
7921 prototype, not the definition. */
7922 error_at (input_location
,
7923 "number of arguments doesn%'t match prototype");
7925 error_at (current_function_prototype_locus
,
7926 "prototype declaration");
7930 /* Type for passing arg must be consistent with that
7931 declared for the arg. ISO C says we take the unqualified
7932 type for parameters declared with qualified type. */
7933 if (TREE_TYPE (parm
) != error_mark_node
7934 && TREE_TYPE (type
) != error_mark_node
7935 && !comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm
)),
7936 TYPE_MAIN_VARIANT (TREE_VALUE (type
))))
7938 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm
))
7939 == TYPE_MAIN_VARIANT (TREE_VALUE (type
)))
7941 /* Adjust argument to match prototype. E.g. a previous
7942 `int foo(float);' prototype causes
7943 `int foo(x) float x; {...}' to be treated like
7944 `int foo(float x) {...}'. This is particularly
7945 useful for argument types like uid_t. */
7946 DECL_ARG_TYPE (parm
) = TREE_TYPE (parm
);
7948 if (targetm
.calls
.promote_prototypes (TREE_TYPE (current_function_decl
))
7949 && INTEGRAL_TYPE_P (TREE_TYPE (parm
))
7950 && TYPE_PRECISION (TREE_TYPE (parm
))
7951 < TYPE_PRECISION (integer_type_node
))
7952 DECL_ARG_TYPE (parm
) = integer_type_node
;
7954 /* ??? Is it possible to get here with a
7955 built-in prototype or will it always have
7956 been diagnosed as conflicting with an
7957 old-style definition and discarded? */
7958 if (current_function_prototype_built_in
)
7959 warning_at (DECL_SOURCE_LOCATION (parm
),
7960 OPT_pedantic
, "promoted argument %qD "
7961 "doesn%'t match built-in prototype", parm
);
7964 pedwarn (DECL_SOURCE_LOCATION (parm
),
7965 OPT_pedantic
, "promoted argument %qD "
7966 "doesn%'t match prototype", parm
);
7967 pedwarn (current_function_prototype_locus
, OPT_pedantic
,
7968 "prototype declaration");
7973 if (current_function_prototype_built_in
)
7974 warning_at (DECL_SOURCE_LOCATION (parm
),
7975 0, "argument %qD doesn%'t match "
7976 "built-in prototype", parm
);
7979 error_at (DECL_SOURCE_LOCATION (parm
),
7980 "argument %qD doesn%'t match prototype", parm
);
7981 error_at (current_function_prototype_locus
,
7982 "prototype declaration");
7987 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl
)) = 0;
7990 /* Otherwise, create a prototype that would match. */
7994 tree actual
= 0, last
= 0, type
;
7996 for (parm
= DECL_ARGUMENTS (fndecl
); parm
; parm
= DECL_CHAIN (parm
))
7998 type
= tree_cons (NULL_TREE
, DECL_ARG_TYPE (parm
), NULL_TREE
);
8000 TREE_CHAIN (last
) = type
;
8005 type
= tree_cons (NULL_TREE
, void_type_node
, NULL_TREE
);
8007 TREE_CHAIN (last
) = type
;
8011 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
8012 of the type of this function, but we need to avoid having this
8013 affect the types of other similarly-typed functions, so we must
8014 first force the generation of an identical (but separate) type
8015 node for the relevant function type. The new node we create
8016 will be a variant of the main variant of the original function
8019 TREE_TYPE (fndecl
) = build_variant_type_copy (TREE_TYPE (fndecl
));
8021 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl
)) = actual
;
8025 /* Store parameter declarations passed in ARG_INFO into the current
8026 function declaration. */
8029 store_parm_decls_from (struct c_arg_info
*arg_info
)
8031 current_function_arg_info
= arg_info
;
8032 store_parm_decls ();
8035 /* Store the parameter declarations into the current function declaration.
8036 This is called after parsing the parameter declarations, before
8037 digesting the body of the function.
8039 For an old-style definition, construct a prototype out of the old-style
8040 parameter declarations and inject it into the function's type. */
8043 store_parm_decls (void)
8045 tree fndecl
= current_function_decl
;
8048 /* The argument information block for FNDECL. */
8049 struct c_arg_info
*arg_info
= current_function_arg_info
;
8050 current_function_arg_info
= 0;
8052 /* True if this definition is written with a prototype. Note:
8053 despite C99 6.7.5.3p14, we can *not* treat an empty argument
8054 list in a function definition as equivalent to (void) -- an
8055 empty argument list specifies the function has no parameters,
8056 but only (void) sets up a prototype for future calls. */
8057 proto
= arg_info
->types
!= 0;
8060 store_parm_decls_newstyle (fndecl
, arg_info
);
8062 store_parm_decls_oldstyle (fndecl
, arg_info
);
8064 /* The next call to push_scope will be a function body. */
8066 next_is_function_body
= true;
8068 /* Write a record describing this function definition to the prototypes
8069 file (if requested). */
8071 gen_aux_info_record (fndecl
, 1, 0, proto
);
8073 /* Initialize the RTL code for the function. */
8074 allocate_struct_function (fndecl
, false);
8076 /* Begin the statement tree for this function. */
8077 DECL_SAVED_TREE (fndecl
) = push_stmt_list ();
8079 /* ??? Insert the contents of the pending sizes list into the function
8080 to be evaluated. The only reason left to have this is
8081 void foo(int n, int array[n++])
8082 because we throw away the array type in favor of a pointer type, and
8083 thus won't naturally see the SAVE_EXPR containing the increment. All
8084 other pending sizes would be handled by gimplify_parameters. */
8086 VEC(tree
,gc
) *pending_sizes
= get_pending_sizes ();
8090 FOR_EACH_VEC_ELT (tree
, pending_sizes
, i
, t
)
8094 /* Even though we're inside a function body, we still don't want to
8095 call expand_expr to calculate the size of a variable-sized array.
8096 We haven't necessarily assigned RTL to all variables yet, so it's
8097 not safe to try to expand expressions involving them. */
8098 cfun
->dont_save_pending_sizes_p
= 1;
8102 /* Finish up a function declaration and compile that function
8103 all the way to assembler language output. Then free the storage
8104 for the function definition.
8106 This is called after parsing the body of the function definition. */
8109 finish_function (void)
8111 tree fndecl
= current_function_decl
;
8113 if (TREE_CODE (fndecl
) == FUNCTION_DECL
8114 && targetm
.calls
.promote_prototypes (TREE_TYPE (fndecl
)))
8116 tree args
= DECL_ARGUMENTS (fndecl
);
8117 for (; args
; args
= DECL_CHAIN (args
))
8119 tree type
= TREE_TYPE (args
);
8120 if (INTEGRAL_TYPE_P (type
)
8121 && TYPE_PRECISION (type
) < TYPE_PRECISION (integer_type_node
))
8122 DECL_ARG_TYPE (args
) = integer_type_node
;
8126 if (DECL_INITIAL (fndecl
) && DECL_INITIAL (fndecl
) != error_mark_node
)
8127 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl
)) = fndecl
;
8129 /* Must mark the RESULT_DECL as being in this function. */
8131 if (DECL_RESULT (fndecl
) && DECL_RESULT (fndecl
) != error_mark_node
)
8132 DECL_CONTEXT (DECL_RESULT (fndecl
)) = fndecl
;
8134 if (MAIN_NAME_P (DECL_NAME (fndecl
)) && flag_hosted
8135 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl
)))
8136 == integer_type_node
&& flag_isoc99
)
8138 /* Hack. We don't want the middle-end to warn that this return
8139 is unreachable, so we mark its location as special. Using
8140 UNKNOWN_LOCATION has the problem that it gets clobbered in
8141 annotate_one_with_locus. A cleaner solution might be to
8142 ensure ! should_carry_locus_p (stmt), but that needs a flag.
8144 c_finish_return (BUILTINS_LOCATION
, integer_zero_node
, NULL_TREE
);
8147 /* Tie off the statement tree for this function. */
8148 DECL_SAVED_TREE (fndecl
) = pop_stmt_list (DECL_SAVED_TREE (fndecl
));
8150 finish_fname_decls ();
8152 /* Complain if there's just no return statement. */
8153 if (warn_return_type
8154 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl
))) != VOID_TYPE
8155 && !current_function_returns_value
&& !current_function_returns_null
8156 /* Don't complain if we are no-return. */
8157 && !current_function_returns_abnormally
8158 /* Don't complain if we are declared noreturn. */
8159 && !TREE_THIS_VOLATILE (fndecl
)
8160 /* Don't warn for main(). */
8161 && !MAIN_NAME_P (DECL_NAME (fndecl
))
8162 /* Or if they didn't actually specify a return type. */
8163 && !C_FUNCTION_IMPLICIT_INT (fndecl
)
8164 /* Normally, with -Wreturn-type, flow will complain, but we might
8165 optimize out static functions. */
8166 && !TREE_PUBLIC (fndecl
))
8168 warning (OPT_Wreturn_type
,
8169 "no return statement in function returning non-void");
8170 TREE_NO_WARNING (fndecl
) = 1;
8173 /* Complain about parameters that are only set, but never otherwise used. */
8174 if (warn_unused_but_set_parameter
)
8178 for (decl
= DECL_ARGUMENTS (fndecl
);
8180 decl
= DECL_CHAIN (decl
))
8181 if (TREE_USED (decl
)
8182 && TREE_CODE (decl
) == PARM_DECL
8183 && !DECL_READ_P (decl
)
8185 && !DECL_ARTIFICIAL (decl
)
8186 && !TREE_NO_WARNING (decl
))
8187 warning_at (DECL_SOURCE_LOCATION (decl
),
8188 OPT_Wunused_but_set_parameter
,
8189 "parameter %qD set but not used", decl
);
8192 /* Store the end of the function, so that we get good line number
8193 info for the epilogue. */
8194 cfun
->function_end_locus
= input_location
;
8196 /* Finalize the ELF visibility for the function. */
8197 c_determine_visibility (fndecl
);
8199 /* For GNU C extern inline functions disregard inline limits. */
8200 if (DECL_EXTERNAL (fndecl
)
8201 && DECL_DECLARED_INLINE_P (fndecl
))
8202 DECL_DISREGARD_INLINE_LIMITS (fndecl
) = 1;
8204 /* Genericize before inlining. Delay genericizing nested functions
8205 until their parent function is genericized. Since finalizing
8206 requires GENERIC, delay that as well. */
8208 if (DECL_INITIAL (fndecl
) && DECL_INITIAL (fndecl
) != error_mark_node
8209 && !undef_nested_function
)
8211 if (!decl_function_context (fndecl
))
8213 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE
, fndecl
);
8214 c_genericize (fndecl
);
8216 /* ??? Objc emits functions after finalizing the compilation unit.
8217 This should be cleaned up later and this conditional removed. */
8218 if (cgraph_global_info_ready
)
8220 cgraph_add_new_function (fndecl
, false);
8223 cgraph_finalize_function (fndecl
, false);
8227 /* Register this function with cgraph just far enough to get it
8228 added to our parent's nested function list. Handy, since the
8229 C front end doesn't have such a list. */
8230 (void) cgraph_node (fndecl
);
8234 if (!decl_function_context (fndecl
))
8235 undef_nested_function
= false;
8237 /* We're leaving the context of this function, so zap cfun.
8238 It's still in DECL_STRUCT_FUNCTION, and we'll restore it in
8239 tree_rest_of_compilation. */
8241 current_function_decl
= NULL
;
8244 /* Check the declarations given in a for-loop for satisfying the C99
8245 constraints. If exactly one such decl is found, return it. LOC is
8246 the location of the opening parenthesis of the for loop. */
8249 check_for_loop_decls (location_t loc
)
8251 struct c_binding
*b
;
8252 tree one_decl
= NULL_TREE
;
8257 static bool hint
= true;
8258 /* If we get here, declarations have been used in a for loop without
8259 the C99 for loop scope. This doesn't make much sense, so don't
8261 error_at (loc
, "%<for%> loop initial declarations "
8262 "are only allowed in C99 mode");
8266 "use option -std=c99 or -std=gnu99 to compile your code");
8271 /* C99 subclause 6.8.5 paragraph 3:
8273 [#3] The declaration part of a for statement shall only
8274 declare identifiers for objects having storage class auto or
8277 It isn't clear whether, in this sentence, "identifiers" binds to
8278 "shall only declare" or to "objects" - that is, whether all identifiers
8279 declared must be identifiers for objects, or whether the restriction
8280 only applies to those that are. (A question on this in comp.std.c
8281 in November 2000 received no answer.) We implement the strictest
8282 interpretation, to avoid creating an extension which later causes
8285 for (b
= current_scope
->bindings
; b
; b
= b
->prev
)
8288 tree decl
= b
->decl
;
8293 switch (TREE_CODE (decl
))
8297 location_t decl_loc
= DECL_SOURCE_LOCATION (decl
);
8298 if (TREE_STATIC (decl
))
8300 "declaration of static variable %qD in %<for%> loop "
8301 "initial declaration", decl
);
8302 else if (DECL_EXTERNAL (decl
))
8304 "declaration of %<extern%> variable %qD in %<for%> loop "
8305 "initial declaration", decl
);
8311 "%<struct %E%> declared in %<for%> loop initial "
8316 "%<union %E%> declared in %<for%> loop initial declaration",
8320 error_at (loc
, "%<enum %E%> declared in %<for%> loop "
8321 "initial declaration", id
);
8324 error_at (loc
, "declaration of non-variable "
8325 "%qD in %<for%> loop initial declaration", decl
);
8332 return n_decls
== 1 ? one_decl
: NULL_TREE
;
8335 /* Save and reinitialize the variables
8336 used during compilation of a C function. */
8339 c_push_function_context (void)
8341 struct language_function
*p
;
8342 p
= ggc_alloc_language_function ();
8345 p
->base
.x_stmt_tree
= c_stmt_tree
;
8346 p
->x_break_label
= c_break_label
;
8347 p
->x_cont_label
= c_cont_label
;
8348 p
->x_switch_stack
= c_switch_stack
;
8349 p
->arg_info
= current_function_arg_info
;
8350 p
->returns_value
= current_function_returns_value
;
8351 p
->returns_null
= current_function_returns_null
;
8352 p
->returns_abnormally
= current_function_returns_abnormally
;
8353 p
->warn_about_return_type
= warn_about_return_type
;
8355 push_function_context ();
8358 /* Restore the variables used during compilation of a C function. */
8361 c_pop_function_context (void)
8363 struct language_function
*p
;
8365 pop_function_context ();
8367 cfun
->language
= NULL
;
8369 if (DECL_STRUCT_FUNCTION (current_function_decl
) == 0
8370 && DECL_SAVED_TREE (current_function_decl
) == NULL_TREE
)
8372 /* Stop pointing to the local nodes about to be freed. */
8373 /* But DECL_INITIAL must remain nonzero so we know this
8374 was an actual function definition. */
8375 DECL_INITIAL (current_function_decl
) = error_mark_node
;
8376 DECL_ARGUMENTS (current_function_decl
) = 0;
8379 c_stmt_tree
= p
->base
.x_stmt_tree
;
8380 c_break_label
= p
->x_break_label
;
8381 c_cont_label
= p
->x_cont_label
;
8382 c_switch_stack
= p
->x_switch_stack
;
8383 current_function_arg_info
= p
->arg_info
;
8384 current_function_returns_value
= p
->returns_value
;
8385 current_function_returns_null
= p
->returns_null
;
8386 current_function_returns_abnormally
= p
->returns_abnormally
;
8387 warn_about_return_type
= p
->warn_about_return_type
;
8390 /* The functions below are required for functionality of doing
8391 function at once processing in the C front end. Currently these
8392 functions are not called from anywhere in the C front end, but as
8393 these changes continue, that will change. */
8395 /* Returns the stmt_tree (if any) to which statements are currently
8396 being added. If there is no active statement-tree, NULL is
8400 current_stmt_tree (void)
8402 return &c_stmt_tree
;
8405 /* Return the global value of T as a symbol. */
8408 identifier_global_value (tree t
)
8410 struct c_binding
*b
;
8412 for (b
= I_SYMBOL_BINDING (t
); b
; b
= b
->shadowed
)
8413 if (B_IN_FILE_SCOPE (b
) || B_IN_EXTERNAL_SCOPE (b
))
8419 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
8420 otherwise the name is found in ridpointers from RID_INDEX. */
8423 record_builtin_type (enum rid rid_index
, const char *name
, tree type
)
8427 id
= ridpointers
[(int) rid_index
];
8429 id
= get_identifier (name
);
8430 decl
= build_decl (UNKNOWN_LOCATION
, TYPE_DECL
, id
, type
);
8432 if (debug_hooks
->type_decl
)
8433 debug_hooks
->type_decl (decl
, false);
8436 /* Build the void_list_node (void_type_node having been created). */
8438 build_void_list_node (void)
8440 tree t
= build_tree_list (NULL_TREE
, void_type_node
);
8444 /* Return a c_parm structure with the given SPECS, ATTRS and DECLARATOR. */
8447 build_c_parm (struct c_declspecs
*specs
, tree attrs
,
8448 struct c_declarator
*declarator
)
8450 struct c_parm
*ret
= XOBNEW (&parser_obstack
, struct c_parm
);
8453 ret
->declarator
= declarator
;
8457 /* Return a declarator with nested attributes. TARGET is the inner
8458 declarator to which these attributes apply. ATTRS are the
8461 struct c_declarator
*
8462 build_attrs_declarator (tree attrs
, struct c_declarator
*target
)
8464 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
8465 ret
->kind
= cdk_attrs
;
8466 ret
->declarator
= target
;
8467 ret
->u
.attrs
= attrs
;
8471 /* Return a declarator for a function with arguments specified by ARGS
8472 and return type specified by TARGET. */
8474 struct c_declarator
*
8475 build_function_declarator (struct c_arg_info
*args
,
8476 struct c_declarator
*target
)
8478 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
8479 ret
->kind
= cdk_function
;
8480 ret
->declarator
= target
;
8481 ret
->u
.arg_info
= args
;
8485 /* Return a declarator for the identifier IDENT (which may be
8486 NULL_TREE for an abstract declarator). */
8488 struct c_declarator
*
8489 build_id_declarator (tree ident
)
8491 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
8493 ret
->declarator
= 0;
8495 /* Default value - may get reset to a more precise location. */
8496 ret
->id_loc
= input_location
;
8500 /* Return something to represent absolute declarators containing a *.
8501 TARGET is the absolute declarator that the * contains.
8502 TYPE_QUALS_ATTRS is a structure for type qualifiers and attributes
8503 to apply to the pointer type. */
8505 struct c_declarator
*
8506 make_pointer_declarator (struct c_declspecs
*type_quals_attrs
,
8507 struct c_declarator
*target
)
8511 struct c_declarator
*itarget
= target
;
8512 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
8513 if (type_quals_attrs
)
8515 attrs
= type_quals_attrs
->attrs
;
8516 quals
= quals_from_declspecs (type_quals_attrs
);
8517 if (attrs
!= NULL_TREE
)
8518 itarget
= build_attrs_declarator (attrs
, target
);
8520 ret
->kind
= cdk_pointer
;
8521 ret
->declarator
= itarget
;
8522 ret
->u
.pointer_quals
= quals
;
8526 /* Return a pointer to a structure for an empty list of declaration
8529 struct c_declspecs
*
8530 build_null_declspecs (void)
8532 struct c_declspecs
*ret
= XOBNEW (&parser_obstack
, struct c_declspecs
);
8537 ret
->typespec_word
= cts_none
;
8538 ret
->storage_class
= csc_none
;
8539 ret
->expr_const_operands
= true;
8540 ret
->declspecs_seen_p
= false;
8541 ret
->type_seen_p
= false;
8542 ret
->non_sc_seen_p
= false;
8543 ret
->typedef_p
= false;
8544 ret
->tag_defined_p
= false;
8545 ret
->explicit_signed_p
= false;
8546 ret
->deprecated_p
= false;
8547 ret
->default_int_p
= false;
8548 ret
->long_p
= false;
8549 ret
->long_long_p
= false;
8550 ret
->short_p
= false;
8551 ret
->signed_p
= false;
8552 ret
->unsigned_p
= false;
8553 ret
->complex_p
= false;
8554 ret
->inline_p
= false;
8555 ret
->thread_p
= false;
8556 ret
->const_p
= false;
8557 ret
->volatile_p
= false;
8558 ret
->restrict_p
= false;
8559 ret
->saturating_p
= false;
8560 ret
->address_space
= ADDR_SPACE_GENERIC
;
8564 /* Add the address space ADDRSPACE to the declaration specifiers
8565 SPECS, returning SPECS. */
8567 struct c_declspecs
*
8568 declspecs_add_addrspace (struct c_declspecs
*specs
, addr_space_t as
)
8570 specs
->non_sc_seen_p
= true;
8571 specs
->declspecs_seen_p
= true;
8573 if (!ADDR_SPACE_GENERIC_P (specs
->address_space
)
8574 && specs
->address_space
!= as
)
8575 error ("incompatible address space qualifiers %qs and %qs",
8576 c_addr_space_name (as
),
8577 c_addr_space_name (specs
->address_space
));
8579 specs
->address_space
= as
;
8583 /* Add the type qualifier QUAL to the declaration specifiers SPECS,
8586 struct c_declspecs
*
8587 declspecs_add_qual (struct c_declspecs
*specs
, tree qual
)
8591 specs
->non_sc_seen_p
= true;
8592 specs
->declspecs_seen_p
= true;
8593 gcc_assert (TREE_CODE (qual
) == IDENTIFIER_NODE
8594 && C_IS_RESERVED_WORD (qual
));
8595 i
= C_RID_CODE (qual
);
8599 dupe
= specs
->const_p
;
8600 specs
->const_p
= true;
8603 dupe
= specs
->volatile_p
;
8604 specs
->volatile_p
= true;
8607 dupe
= specs
->restrict_p
;
8608 specs
->restrict_p
= true;
8613 if (dupe
&& !flag_isoc99
)
8614 pedwarn (input_location
, OPT_pedantic
, "duplicate %qE", qual
);
8618 /* Add the type specifier TYPE to the declaration specifiers SPECS,
8621 struct c_declspecs
*
8622 declspecs_add_type (location_t loc
, struct c_declspecs
*specs
,
8623 struct c_typespec spec
)
8625 tree type
= spec
.spec
;
8626 specs
->non_sc_seen_p
= true;
8627 specs
->declspecs_seen_p
= true;
8628 specs
->type_seen_p
= true;
8629 if (TREE_DEPRECATED (type
))
8630 specs
->deprecated_p
= true;
8632 /* Handle type specifier keywords. */
8633 if (TREE_CODE (type
) == IDENTIFIER_NODE
8634 && C_IS_RESERVED_WORD (type
)
8635 && C_RID_CODE (type
) != RID_CXX_COMPAT_WARN
)
8637 enum rid i
= C_RID_CODE (type
);
8640 error_at (loc
, "two or more data types in declaration specifiers");
8643 if ((int) i
<= (int) RID_LAST_MODIFIER
)
8645 /* "long", "short", "signed", "unsigned", "_Complex" or "_Sat". */
8650 if (specs
->long_long_p
)
8652 error_at (loc
, "%<long long long%> is too long for GCC");
8657 if (specs
->typespec_word
== cts_double
)
8660 ("both %<long long%> and %<double%> in "
8661 "declaration specifiers"));
8664 pedwarn_c90 (loc
, OPT_Wlong_long
,
8665 "ISO C90 does not support %<long long%>");
8666 specs
->long_long_p
= 1;
8671 ("both %<long%> and %<short%> in "
8672 "declaration specifiers"));
8673 else if (specs
->typespec_word
== cts_void
)
8675 ("both %<long%> and %<void%> in "
8676 "declaration specifiers"));
8677 else if (specs
->typespec_word
== cts_int128
)
8679 ("both %<long%> and %<__int128%> in "
8680 "declaration specifiers"));
8681 else if (specs
->typespec_word
== cts_bool
)
8683 ("both %<long%> and %<_Bool%> in "
8684 "declaration specifiers"));
8685 else if (specs
->typespec_word
== cts_char
)
8687 ("both %<long%> and %<char%> in "
8688 "declaration specifiers"));
8689 else if (specs
->typespec_word
== cts_float
)
8691 ("both %<long%> and %<float%> in "
8692 "declaration specifiers"));
8693 else if (specs
->typespec_word
== cts_dfloat32
)
8695 ("both %<long%> and %<_Decimal32%> in "
8696 "declaration specifiers"));
8697 else if (specs
->typespec_word
== cts_dfloat64
)
8699 ("both %<long%> and %<_Decimal64%> in "
8700 "declaration specifiers"));
8701 else if (specs
->typespec_word
== cts_dfloat128
)
8703 ("both %<long%> and %<_Decimal128%> in "
8704 "declaration specifiers"));
8706 specs
->long_p
= true;
8709 dupe
= specs
->short_p
;
8712 ("both %<long%> and %<short%> in "
8713 "declaration specifiers"));
8714 else if (specs
->typespec_word
== cts_void
)
8716 ("both %<short%> and %<void%> in "
8717 "declaration specifiers"));
8718 else if (specs
->typespec_word
== cts_int128
)
8720 ("both %<short%> and %<__int128%> in "
8721 "declaration specifiers"));
8722 else if (specs
->typespec_word
== cts_bool
)
8724 ("both %<short%> and %<_Bool%> in "
8725 "declaration specifiers"));
8726 else if (specs
->typespec_word
== cts_char
)
8728 ("both %<short%> and %<char%> in "
8729 "declaration specifiers"));
8730 else if (specs
->typespec_word
== cts_float
)
8732 ("both %<short%> and %<float%> in "
8733 "declaration specifiers"));
8734 else if (specs
->typespec_word
== cts_double
)
8736 ("both %<short%> and %<double%> in "
8737 "declaration specifiers"));
8738 else if (specs
->typespec_word
== cts_dfloat32
)
8740 ("both %<short%> and %<_Decimal32%> in "
8741 "declaration specifiers"));
8742 else if (specs
->typespec_word
== cts_dfloat64
)
8744 ("both %<short%> and %<_Decimal64%> in "
8745 "declaration specifiers"));
8746 else if (specs
->typespec_word
== cts_dfloat128
)
8748 ("both %<short%> and %<_Decimal128%> in "
8749 "declaration specifiers"));
8751 specs
->short_p
= true;
8754 dupe
= specs
->signed_p
;
8755 if (specs
->unsigned_p
)
8757 ("both %<signed%> and %<unsigned%> in "
8758 "declaration specifiers"));
8759 else if (specs
->typespec_word
== cts_void
)
8761 ("both %<signed%> and %<void%> in "
8762 "declaration specifiers"));
8763 else if (specs
->typespec_word
== cts_bool
)
8765 ("both %<signed%> and %<_Bool%> in "
8766 "declaration specifiers"));
8767 else if (specs
->typespec_word
== cts_float
)
8769 ("both %<signed%> and %<float%> in "
8770 "declaration specifiers"));
8771 else if (specs
->typespec_word
== cts_double
)
8773 ("both %<signed%> and %<double%> in "
8774 "declaration specifiers"));
8775 else if (specs
->typespec_word
== cts_dfloat32
)
8777 ("both %<signed%> and %<_Decimal32%> in "
8778 "declaration specifiers"));
8779 else if (specs
->typespec_word
== cts_dfloat64
)
8781 ("both %<signed%> and %<_Decimal64%> in "
8782 "declaration specifiers"));
8783 else if (specs
->typespec_word
== cts_dfloat128
)
8785 ("both %<signed%> and %<_Decimal128%> in "
8786 "declaration specifiers"));
8788 specs
->signed_p
= true;
8791 dupe
= specs
->unsigned_p
;
8792 if (specs
->signed_p
)
8794 ("both %<signed%> and %<unsigned%> in "
8795 "declaration specifiers"));
8796 else if (specs
->typespec_word
== cts_void
)
8798 ("both %<unsigned%> and %<void%> in "
8799 "declaration specifiers"));
8800 else if (specs
->typespec_word
== cts_bool
)
8802 ("both %<unsigned%> and %<_Bool%> in "
8803 "declaration specifiers"));
8804 else if (specs
->typespec_word
== cts_float
)
8806 ("both %<unsigned%> and %<float%> in "
8807 "declaration specifiers"));
8808 else if (specs
->typespec_word
== cts_double
)
8810 ("both %<unsigned%> and %<double%> in "
8811 "declaration specifiers"));
8812 else if (specs
->typespec_word
== cts_dfloat32
)
8814 ("both %<unsigned%> and %<_Decimal32%> in "
8815 "declaration specifiers"));
8816 else if (specs
->typespec_word
== cts_dfloat64
)
8818 ("both %<unsigned%> and %<_Decimal64%> in "
8819 "declaration specifiers"));
8820 else if (specs
->typespec_word
== cts_dfloat128
)
8822 ("both %<unsigned%> and %<_Decimal128%> in "
8823 "declaration specifiers"));
8825 specs
->unsigned_p
= true;
8828 dupe
= specs
->complex_p
;
8829 if (!flag_isoc99
&& !in_system_header
)
8830 pedwarn (loc
, OPT_pedantic
,
8831 "ISO C90 does not support complex types");
8832 if (specs
->typespec_word
== cts_void
)
8834 ("both %<complex%> and %<void%> in "
8835 "declaration specifiers"));
8836 else if (specs
->typespec_word
== cts_bool
)
8838 ("both %<complex%> and %<_Bool%> in "
8839 "declaration specifiers"));
8840 else if (specs
->typespec_word
== cts_dfloat32
)
8842 ("both %<complex%> and %<_Decimal32%> in "
8843 "declaration specifiers"));
8844 else if (specs
->typespec_word
== cts_dfloat64
)
8846 ("both %<complex%> and %<_Decimal64%> in "
8847 "declaration specifiers"));
8848 else if (specs
->typespec_word
== cts_dfloat128
)
8850 ("both %<complex%> and %<_Decimal128%> in "
8851 "declaration specifiers"));
8852 else if (specs
->typespec_word
== cts_fract
)
8854 ("both %<complex%> and %<_Fract%> in "
8855 "declaration specifiers"));
8856 else if (specs
->typespec_word
== cts_accum
)
8858 ("both %<complex%> and %<_Accum%> in "
8859 "declaration specifiers"));
8860 else if (specs
->saturating_p
)
8862 ("both %<complex%> and %<_Sat%> in "
8863 "declaration specifiers"));
8865 specs
->complex_p
= true;
8868 dupe
= specs
->saturating_p
;
8869 pedwarn (loc
, OPT_pedantic
,
8870 "ISO C does not support saturating types");
8871 if (specs
->typespec_word
== cts_int128
)
8874 ("both %<_Sat%> and %<__int128%> in "
8875 "declaration specifiers"));
8877 else if (specs
->typespec_word
== cts_void
)
8879 ("both %<_Sat%> and %<void%> in "
8880 "declaration specifiers"));
8881 else if (specs
->typespec_word
== cts_bool
)
8883 ("both %<_Sat%> and %<_Bool%> in "
8884 "declaration specifiers"));
8885 else if (specs
->typespec_word
== cts_char
)
8887 ("both %<_Sat%> and %<char%> in "
8888 "declaration specifiers"));
8889 else if (specs
->typespec_word
== cts_int
)
8891 ("both %<_Sat%> and %<int%> in "
8892 "declaration specifiers"));
8893 else if (specs
->typespec_word
== cts_float
)
8895 ("both %<_Sat%> and %<float%> in "
8896 "declaration specifiers"));
8897 else if (specs
->typespec_word
== cts_double
)
8899 ("both %<_Sat%> and %<double%> in "
8900 "declaration specifiers"));
8901 else if (specs
->typespec_word
== cts_dfloat32
)
8903 ("both %<_Sat%> and %<_Decimal32%> in "
8904 "declaration specifiers"));
8905 else if (specs
->typespec_word
== cts_dfloat64
)
8907 ("both %<_Sat%> and %<_Decimal64%> in "
8908 "declaration specifiers"));
8909 else if (specs
->typespec_word
== cts_dfloat128
)
8911 ("both %<_Sat%> and %<_Decimal128%> in "
8912 "declaration specifiers"));
8913 else if (specs
->complex_p
)
8915 ("both %<_Sat%> and %<complex%> in "
8916 "declaration specifiers"));
8918 specs
->saturating_p
= true;
8925 error_at (loc
, "duplicate %qE", type
);
8931 /* "void", "_Bool", "char", "int", "float", "double", "_Decimal32",
8932 "__int128", "_Decimal64", "_Decimal128", "_Fract" or "_Accum". */
8933 if (specs
->typespec_word
!= cts_none
)
8936 "two or more data types in declaration specifiers");
8942 if (int128_integer_type_node
== NULL_TREE
)
8944 error_at (loc
, "%<__int128%> is not supported for this target");
8947 if (!in_system_header
)
8948 pedwarn (loc
, OPT_pedantic
,
8949 "ISO C does not support %<__int128%> type");
8953 ("both %<__int128%> and %<long%> in "
8954 "declaration specifiers"));
8955 else if (specs
->saturating_p
)
8957 ("both %<_Sat%> and %<__int128%> in "
8958 "declaration specifiers"));
8959 else if (specs
->short_p
)
8961 ("both %<__int128%> and %<short%> in "
8962 "declaration specifiers"));
8964 specs
->typespec_word
= cts_int128
;
8969 ("both %<long%> and %<void%> in "
8970 "declaration specifiers"));
8971 else if (specs
->short_p
)
8973 ("both %<short%> and %<void%> in "
8974 "declaration specifiers"));
8975 else if (specs
->signed_p
)
8977 ("both %<signed%> and %<void%> in "
8978 "declaration specifiers"));
8979 else if (specs
->unsigned_p
)
8981 ("both %<unsigned%> and %<void%> in "
8982 "declaration specifiers"));
8983 else if (specs
->complex_p
)
8985 ("both %<complex%> and %<void%> in "
8986 "declaration specifiers"));
8987 else if (specs
->saturating_p
)
8989 ("both %<_Sat%> and %<void%> in "
8990 "declaration specifiers"));
8992 specs
->typespec_word
= cts_void
;
8997 ("both %<long%> and %<_Bool%> in "
8998 "declaration specifiers"));
8999 else if (specs
->short_p
)
9001 ("both %<short%> and %<_Bool%> in "
9002 "declaration specifiers"));
9003 else if (specs
->signed_p
)
9005 ("both %<signed%> and %<_Bool%> in "
9006 "declaration specifiers"));
9007 else if (specs
->unsigned_p
)
9009 ("both %<unsigned%> and %<_Bool%> in "
9010 "declaration specifiers"));
9011 else if (specs
->complex_p
)
9013 ("both %<complex%> and %<_Bool%> in "
9014 "declaration specifiers"));
9015 else if (specs
->saturating_p
)
9017 ("both %<_Sat%> and %<_Bool%> in "
9018 "declaration specifiers"));
9020 specs
->typespec_word
= cts_bool
;
9025 ("both %<long%> and %<char%> in "
9026 "declaration specifiers"));
9027 else if (specs
->short_p
)
9029 ("both %<short%> and %<char%> in "
9030 "declaration specifiers"));
9031 else if (specs
->saturating_p
)
9033 ("both %<_Sat%> and %<char%> in "
9034 "declaration specifiers"));
9036 specs
->typespec_word
= cts_char
;
9039 if (specs
->saturating_p
)
9041 ("both %<_Sat%> and %<int%> in "
9042 "declaration specifiers"));
9044 specs
->typespec_word
= cts_int
;
9049 ("both %<long%> and %<float%> in "
9050 "declaration specifiers"));
9051 else if (specs
->short_p
)
9053 ("both %<short%> and %<float%> in "
9054 "declaration specifiers"));
9055 else if (specs
->signed_p
)
9057 ("both %<signed%> and %<float%> in "
9058 "declaration specifiers"));
9059 else if (specs
->unsigned_p
)
9061 ("both %<unsigned%> and %<float%> in "
9062 "declaration specifiers"));
9063 else if (specs
->saturating_p
)
9065 ("both %<_Sat%> and %<float%> in "
9066 "declaration specifiers"));
9068 specs
->typespec_word
= cts_float
;
9071 if (specs
->long_long_p
)
9073 ("both %<long long%> and %<double%> in "
9074 "declaration specifiers"));
9075 else if (specs
->short_p
)
9077 ("both %<short%> and %<double%> in "
9078 "declaration specifiers"));
9079 else if (specs
->signed_p
)
9081 ("both %<signed%> and %<double%> in "
9082 "declaration specifiers"));
9083 else if (specs
->unsigned_p
)
9085 ("both %<unsigned%> and %<double%> in "
9086 "declaration specifiers"));
9087 else if (specs
->saturating_p
)
9089 ("both %<_Sat%> and %<double%> in "
9090 "declaration specifiers"));
9092 specs
->typespec_word
= cts_double
;
9099 if (i
== RID_DFLOAT32
)
9101 else if (i
== RID_DFLOAT64
)
9104 str
= "_Decimal128";
9105 if (specs
->long_long_p
)
9107 ("both %<long long%> and %<%s%> in "
9108 "declaration specifiers"),
9112 ("both %<long%> and %<%s%> in "
9113 "declaration specifiers"),
9115 else if (specs
->short_p
)
9117 ("both %<short%> and %<%s%> in "
9118 "declaration specifiers"),
9120 else if (specs
->signed_p
)
9122 ("both %<signed%> and %<%s%> in "
9123 "declaration specifiers"),
9125 else if (specs
->unsigned_p
)
9127 ("both %<unsigned%> and %<%s%> in "
9128 "declaration specifiers"),
9130 else if (specs
->complex_p
)
9132 ("both %<complex%> and %<%s%> in "
9133 "declaration specifiers"),
9135 else if (specs
->saturating_p
)
9137 ("both %<_Sat%> and %<%s%> in "
9138 "declaration specifiers"),
9140 else if (i
== RID_DFLOAT32
)
9141 specs
->typespec_word
= cts_dfloat32
;
9142 else if (i
== RID_DFLOAT64
)
9143 specs
->typespec_word
= cts_dfloat64
;
9145 specs
->typespec_word
= cts_dfloat128
;
9147 if (!targetm
.decimal_float_supported_p ())
9149 ("decimal floating point not supported "
9150 "for this target"));
9151 pedwarn (loc
, OPT_pedantic
,
9152 "ISO C does not support decimal floating point");
9162 if (specs
->complex_p
)
9164 ("both %<complex%> and %<%s%> in "
9165 "declaration specifiers"),
9167 else if (i
== RID_FRACT
)
9168 specs
->typespec_word
= cts_fract
;
9170 specs
->typespec_word
= cts_accum
;
9172 if (!targetm
.fixed_point_supported_p ())
9174 "fixed-point types not supported for this target");
9175 pedwarn (loc
, OPT_pedantic
,
9176 "ISO C does not support fixed-point types");
9179 /* ObjC reserved word "id", handled below. */
9185 /* Now we have a typedef (a TYPE_DECL node), an identifier (some
9186 form of ObjC type, cases such as "int" and "long" being handled
9187 above), a TYPE (struct, union, enum and typeof specifiers) or an
9188 ERROR_MARK. In none of these cases may there have previously
9189 been any type specifiers. */
9190 if (specs
->type
|| specs
->typespec_word
!= cts_none
9191 || specs
->long_p
|| specs
->short_p
|| specs
->signed_p
9192 || specs
->unsigned_p
|| specs
->complex_p
)
9193 error_at (loc
, "two or more data types in declaration specifiers");
9194 else if (TREE_CODE (type
) == TYPE_DECL
)
9196 if (TREE_TYPE (type
) == error_mark_node
)
9197 ; /* Allow the type to default to int to avoid cascading errors. */
9200 specs
->type
= TREE_TYPE (type
);
9201 specs
->decl_attr
= DECL_ATTRIBUTES (type
);
9202 specs
->typedef_p
= true;
9203 specs
->explicit_signed_p
= C_TYPEDEF_EXPLICITLY_SIGNED (type
);
9205 /* If this typedef name is defined in a struct, then a C++
9206 lookup would return a different value. */
9208 && I_SYMBOL_BINDING (DECL_NAME (type
))->in_struct
)
9209 warning_at (loc
, OPT_Wc___compat
,
9210 "C++ lookup of %qD would return a field, not a type",
9213 /* If we are parsing a struct, record that a struct field
9215 if (warn_cxx_compat
&& struct_parse_info
!= NULL
)
9216 VEC_safe_push (tree
, heap
, struct_parse_info
->typedefs_seen
, type
);
9219 else if (TREE_CODE (type
) == IDENTIFIER_NODE
)
9221 tree t
= lookup_name (type
);
9222 if (!t
|| TREE_CODE (t
) != TYPE_DECL
)
9223 error_at (loc
, "%qE fails to be a typedef or built in type", type
);
9224 else if (TREE_TYPE (t
) == error_mark_node
)
9227 specs
->type
= TREE_TYPE (t
);
9229 else if (TREE_CODE (type
) != ERROR_MARK
)
9231 if (spec
.kind
== ctsk_tagdef
|| spec
.kind
== ctsk_tagfirstref
)
9232 specs
->tag_defined_p
= true;
9233 if (spec
.kind
== ctsk_typeof
)
9235 specs
->typedef_p
= true;
9239 specs
->expr
= build2 (COMPOUND_EXPR
, TREE_TYPE (spec
.expr
),
9240 specs
->expr
, spec
.expr
);
9242 specs
->expr
= spec
.expr
;
9243 specs
->expr_const_operands
&= spec
.expr_const_operands
;
9252 /* Add the storage class specifier or function specifier SCSPEC to the
9253 declaration specifiers SPECS, returning SPECS. */
9255 struct c_declspecs
*
9256 declspecs_add_scspec (struct c_declspecs
*specs
, tree scspec
)
9259 enum c_storage_class n
= csc_none
;
9261 specs
->declspecs_seen_p
= true;
9262 gcc_assert (TREE_CODE (scspec
) == IDENTIFIER_NODE
9263 && C_IS_RESERVED_WORD (scspec
));
9264 i
= C_RID_CODE (scspec
);
9265 if (specs
->non_sc_seen_p
)
9266 warning (OPT_Wold_style_declaration
,
9267 "%qE is not at beginning of declaration", scspec
);
9271 /* C99 permits duplicate inline. Although of doubtful utility,
9272 it seems simplest to permit it in gnu89 mode as well, as
9273 there is also little utility in maintaining this as a
9274 difference between gnu89 and C99 inline. */
9276 specs
->inline_p
= true;
9279 dupe
= specs
->thread_p
;
9280 if (specs
->storage_class
== csc_auto
)
9281 error ("%<__thread%> used with %<auto%>");
9282 else if (specs
->storage_class
== csc_register
)
9283 error ("%<__thread%> used with %<register%>");
9284 else if (specs
->storage_class
== csc_typedef
)
9285 error ("%<__thread%> used with %<typedef%>");
9287 specs
->thread_p
= true;
9294 /* Diagnose "__thread extern". */
9295 if (specs
->thread_p
)
9296 error ("%<__thread%> before %<extern%>");
9303 /* Diagnose "__thread static". */
9304 if (specs
->thread_p
)
9305 error ("%<__thread%> before %<static%>");
9313 if (n
!= csc_none
&& n
== specs
->storage_class
)
9316 error ("duplicate %qE", scspec
);
9319 if (specs
->storage_class
!= csc_none
&& n
!= specs
->storage_class
)
9321 error ("multiple storage classes in declaration specifiers");
9325 specs
->storage_class
= n
;
9326 if (n
!= csc_extern
&& n
!= csc_static
&& specs
->thread_p
)
9328 error ("%<__thread%> used with %qE", scspec
);
9329 specs
->thread_p
= false;
9336 /* Add the attributes ATTRS to the declaration specifiers SPECS,
9339 struct c_declspecs
*
9340 declspecs_add_attrs (struct c_declspecs
*specs
, tree attrs
)
9342 specs
->attrs
= chainon (attrs
, specs
->attrs
);
9343 specs
->declspecs_seen_p
= true;
9347 /* Combine "long", "short", "signed", "unsigned" and "_Complex" type
9348 specifiers with any other type specifier to determine the resulting
9349 type. This is where ISO C checks on complex types are made, since
9350 "_Complex long" is a prefix of the valid ISO C type "_Complex long
9353 struct c_declspecs
*
9354 finish_declspecs (struct c_declspecs
*specs
)
9356 /* If a type was specified as a whole, we have no modifiers and are
9358 if (specs
->type
!= NULL_TREE
)
9360 gcc_assert (!specs
->long_p
&& !specs
->long_long_p
&& !specs
->short_p
9361 && !specs
->signed_p
&& !specs
->unsigned_p
9362 && !specs
->complex_p
);
9366 /* If none of "void", "_Bool", "char", "int", "float" or "double"
9367 has been specified, treat it as "int" unless "_Complex" is
9368 present and there are no other specifiers. If we just have
9369 "_Complex", it is equivalent to "_Complex double", but e.g.
9370 "_Complex short" is equivalent to "_Complex short int". */
9371 if (specs
->typespec_word
== cts_none
)
9373 if (specs
->saturating_p
)
9375 error ("%<_Sat%> is used without %<_Fract%> or %<_Accum%>");
9376 if (!targetm
.fixed_point_supported_p ())
9377 error ("fixed-point types not supported for this target");
9378 specs
->typespec_word
= cts_fract
;
9380 else if (specs
->long_p
|| specs
->short_p
9381 || specs
->signed_p
|| specs
->unsigned_p
)
9383 specs
->typespec_word
= cts_int
;
9385 else if (specs
->complex_p
)
9387 specs
->typespec_word
= cts_double
;
9388 pedwarn (input_location
, OPT_pedantic
,
9389 "ISO C does not support plain %<complex%> meaning "
9390 "%<double complex%>");
9394 specs
->typespec_word
= cts_int
;
9395 specs
->default_int_p
= true;
9396 /* We don't diagnose this here because grokdeclarator will
9397 give more specific diagnostics according to whether it is
9398 a function definition. */
9402 /* If "signed" was specified, record this to distinguish "int" and
9403 "signed int" in the case of a bit-field with
9404 -funsigned-bitfields. */
9405 specs
->explicit_signed_p
= specs
->signed_p
;
9407 /* Now compute the actual type. */
9408 switch (specs
->typespec_word
)
9411 gcc_assert (!specs
->long_p
&& !specs
->short_p
9412 && !specs
->signed_p
&& !specs
->unsigned_p
9413 && !specs
->complex_p
);
9414 specs
->type
= void_type_node
;
9417 gcc_assert (!specs
->long_p
&& !specs
->short_p
9418 && !specs
->signed_p
&& !specs
->unsigned_p
9419 && !specs
->complex_p
);
9420 specs
->type
= boolean_type_node
;
9423 gcc_assert (!specs
->long_p
&& !specs
->short_p
);
9424 gcc_assert (!(specs
->signed_p
&& specs
->unsigned_p
));
9425 if (specs
->signed_p
)
9426 specs
->type
= signed_char_type_node
;
9427 else if (specs
->unsigned_p
)
9428 specs
->type
= unsigned_char_type_node
;
9430 specs
->type
= char_type_node
;
9431 if (specs
->complex_p
)
9433 pedwarn (input_location
, OPT_pedantic
,
9434 "ISO C does not support complex integer types");
9435 specs
->type
= build_complex_type (specs
->type
);
9439 gcc_assert (!specs
->long_p
&& !specs
->short_p
&& !specs
->long_long_p
);
9440 gcc_assert (!(specs
->signed_p
&& specs
->unsigned_p
));
9441 specs
->type
= (specs
->unsigned_p
9442 ? int128_unsigned_type_node
9443 : int128_integer_type_node
);
9444 if (specs
->complex_p
)
9446 pedwarn (input_location
, OPT_pedantic
,
9447 "ISO C does not support complex integer types");
9448 specs
->type
= build_complex_type (specs
->type
);
9452 gcc_assert (!(specs
->long_p
&& specs
->short_p
));
9453 gcc_assert (!(specs
->signed_p
&& specs
->unsigned_p
));
9454 if (specs
->long_long_p
)
9455 specs
->type
= (specs
->unsigned_p
9456 ? long_long_unsigned_type_node
9457 : long_long_integer_type_node
);
9458 else if (specs
->long_p
)
9459 specs
->type
= (specs
->unsigned_p
9460 ? long_unsigned_type_node
9461 : long_integer_type_node
);
9462 else if (specs
->short_p
)
9463 specs
->type
= (specs
->unsigned_p
9464 ? short_unsigned_type_node
9465 : short_integer_type_node
);
9467 specs
->type
= (specs
->unsigned_p
9468 ? unsigned_type_node
9469 : integer_type_node
);
9470 if (specs
->complex_p
)
9472 pedwarn (input_location
, OPT_pedantic
,
9473 "ISO C does not support complex integer types");
9474 specs
->type
= build_complex_type (specs
->type
);
9478 gcc_assert (!specs
->long_p
&& !specs
->short_p
9479 && !specs
->signed_p
&& !specs
->unsigned_p
);
9480 specs
->type
= (specs
->complex_p
9481 ? complex_float_type_node
9485 gcc_assert (!specs
->long_long_p
&& !specs
->short_p
9486 && !specs
->signed_p
&& !specs
->unsigned_p
);
9489 specs
->type
= (specs
->complex_p
9490 ? complex_long_double_type_node
9491 : long_double_type_node
);
9495 specs
->type
= (specs
->complex_p
9496 ? complex_double_type_node
9497 : double_type_node
);
9503 gcc_assert (!specs
->long_p
&& !specs
->long_long_p
&& !specs
->short_p
9504 && !specs
->signed_p
&& !specs
->unsigned_p
&& !specs
->complex_p
);
9505 if (specs
->typespec_word
== cts_dfloat32
)
9506 specs
->type
= dfloat32_type_node
;
9507 else if (specs
->typespec_word
== cts_dfloat64
)
9508 specs
->type
= dfloat64_type_node
;
9510 specs
->type
= dfloat128_type_node
;
9513 gcc_assert (!specs
->complex_p
);
9514 if (!targetm
.fixed_point_supported_p ())
9515 specs
->type
= integer_type_node
;
9516 else if (specs
->saturating_p
)
9518 if (specs
->long_long_p
)
9519 specs
->type
= specs
->unsigned_p
9520 ? sat_unsigned_long_long_fract_type_node
9521 : sat_long_long_fract_type_node
;
9522 else if (specs
->long_p
)
9523 specs
->type
= specs
->unsigned_p
9524 ? sat_unsigned_long_fract_type_node
9525 : sat_long_fract_type_node
;
9526 else if (specs
->short_p
)
9527 specs
->type
= specs
->unsigned_p
9528 ? sat_unsigned_short_fract_type_node
9529 : sat_short_fract_type_node
;
9531 specs
->type
= specs
->unsigned_p
9532 ? sat_unsigned_fract_type_node
9533 : sat_fract_type_node
;
9537 if (specs
->long_long_p
)
9538 specs
->type
= specs
->unsigned_p
9539 ? unsigned_long_long_fract_type_node
9540 : long_long_fract_type_node
;
9541 else if (specs
->long_p
)
9542 specs
->type
= specs
->unsigned_p
9543 ? unsigned_long_fract_type_node
9544 : long_fract_type_node
;
9545 else if (specs
->short_p
)
9546 specs
->type
= specs
->unsigned_p
9547 ? unsigned_short_fract_type_node
9548 : short_fract_type_node
;
9550 specs
->type
= specs
->unsigned_p
9551 ? unsigned_fract_type_node
9556 gcc_assert (!specs
->complex_p
);
9557 if (!targetm
.fixed_point_supported_p ())
9558 specs
->type
= integer_type_node
;
9559 else if (specs
->saturating_p
)
9561 if (specs
->long_long_p
)
9562 specs
->type
= specs
->unsigned_p
9563 ? sat_unsigned_long_long_accum_type_node
9564 : sat_long_long_accum_type_node
;
9565 else if (specs
->long_p
)
9566 specs
->type
= specs
->unsigned_p
9567 ? sat_unsigned_long_accum_type_node
9568 : sat_long_accum_type_node
;
9569 else if (specs
->short_p
)
9570 specs
->type
= specs
->unsigned_p
9571 ? sat_unsigned_short_accum_type_node
9572 : sat_short_accum_type_node
;
9574 specs
->type
= specs
->unsigned_p
9575 ? sat_unsigned_accum_type_node
9576 : sat_accum_type_node
;
9580 if (specs
->long_long_p
)
9581 specs
->type
= specs
->unsigned_p
9582 ? unsigned_long_long_accum_type_node
9583 : long_long_accum_type_node
;
9584 else if (specs
->long_p
)
9585 specs
->type
= specs
->unsigned_p
9586 ? unsigned_long_accum_type_node
9587 : long_accum_type_node
;
9588 else if (specs
->short_p
)
9589 specs
->type
= specs
->unsigned_p
9590 ? unsigned_short_accum_type_node
9591 : short_accum_type_node
;
9593 specs
->type
= specs
->unsigned_p
9594 ? unsigned_accum_type_node
9605 /* A subroutine of c_write_global_declarations. Perform final processing
9606 on one file scope's declarations (or the external scope's declarations),
9610 c_write_global_declarations_1 (tree globals
)
9615 /* Process the decls in the order they were written. */
9616 for (decl
= globals
; decl
; decl
= DECL_CHAIN (decl
))
9618 /* Check for used but undefined static functions using the C
9619 standard's definition of "used", and set TREE_NO_WARNING so
9620 that check_global_declarations doesn't repeat the check. */
9621 if (TREE_CODE (decl
) == FUNCTION_DECL
9622 && DECL_INITIAL (decl
) == 0
9623 && DECL_EXTERNAL (decl
)
9624 && !TREE_PUBLIC (decl
)
9625 && C_DECL_USED (decl
))
9627 pedwarn (input_location
, 0, "%q+F used but never defined", decl
);
9628 TREE_NO_WARNING (decl
) = 1;
9631 wrapup_global_declaration_1 (decl
);
9637 for (decl
= globals
; decl
; decl
= DECL_CHAIN (decl
))
9638 reconsider
|= wrapup_global_declaration_2 (decl
);
9642 for (decl
= globals
; decl
; decl
= DECL_CHAIN (decl
))
9643 check_global_declaration_1 (decl
);
9646 /* A subroutine of c_write_global_declarations Emit debug information for each
9647 of the declarations in GLOBALS. */
9650 c_write_global_declarations_2 (tree globals
)
9654 for (decl
= globals
; decl
; decl
= DECL_CHAIN (decl
))
9655 debug_hooks
->global_decl (decl
);
9658 /* Callback to collect a source_ref from a DECL. */
9661 collect_source_ref_cb (tree decl
)
9663 if (!DECL_IS_BUILTIN (decl
))
9664 collect_source_ref (LOCATION_FILE (decl_sloc (decl
, false)));
9667 /* Collect all references relevant to SOURCE_FILE. */
9670 collect_all_refs (const char *source_file
)
9675 FOR_EACH_VEC_ELT (tree
, all_translation_units
, i
, t
)
9676 collect_ada_nodes (BLOCK_VARS (DECL_INITIAL (t
)), source_file
);
9679 /* Iterate over all global declarations and call CALLBACK. */
9682 for_each_global_decl (void (*callback
) (tree decl
))
9689 FOR_EACH_VEC_ELT (tree
, all_translation_units
, i
, t
)
9691 decls
= DECL_INITIAL (t
);
9692 for (decl
= BLOCK_VARS (decls
); decl
; decl
= TREE_CHAIN (decl
))
9697 /* Preserve the external declarations scope across a garbage collect. */
9698 static GTY(()) tree ext_block
;
9701 c_write_global_declarations (void)
9706 /* We don't want to do this if generating a PCH. */
9710 /* Close the external scope. */
9711 ext_block
= pop_scope ();
9713 gcc_assert (!current_scope
);
9715 /* Handle -fdump-ada-spec[-slim]. */
9716 if (dump_enabled_p (TDI_ada
))
9718 /* Build a table of files to generate specs for */
9719 if (get_dump_file_info (TDI_ada
)->flags
& TDF_SLIM
)
9720 collect_source_ref (main_input_filename
);
9722 for_each_global_decl (collect_source_ref_cb
);
9724 dump_ada_specs (collect_all_refs
, NULL
);
9729 tree tmp
= BLOCK_VARS (ext_block
);
9731 FILE * stream
= dump_begin (TDI_tu
, &flags
);
9734 dump_node (tmp
, flags
& ~TDF_SLIM
, stream
);
9735 dump_end (TDI_tu
, stream
);
9739 /* Process all file scopes in this compilation, and the external_scope,
9740 through wrapup_global_declarations and check_global_declarations. */
9741 FOR_EACH_VEC_ELT (tree
, all_translation_units
, i
, t
)
9742 c_write_global_declarations_1 (BLOCK_VARS (DECL_INITIAL (t
)));
9743 c_write_global_declarations_1 (BLOCK_VARS (ext_block
));
9745 /* We're done parsing; proceed to optimize and emit assembly.
9746 FIXME: shouldn't be the front end's responsibility to call this. */
9747 cgraph_finalize_compilation_unit ();
9749 /* After cgraph has had a chance to emit everything that's going to
9750 be emitted, output debug information for globals. */
9753 timevar_push (TV_SYMOUT
);
9754 FOR_EACH_VEC_ELT (tree
, all_translation_units
, i
, t
)
9755 c_write_global_declarations_2 (BLOCK_VARS (DECL_INITIAL (t
)));
9756 c_write_global_declarations_2 (BLOCK_VARS (ext_block
));
9757 timevar_pop (TV_SYMOUT
);
9763 /* Register reserved keyword WORD as qualifier for address space AS. */
9766 c_register_addr_space (const char *word
, addr_space_t as
)
9768 int rid
= RID_FIRST_ADDR_SPACE
+ as
;
9771 /* Address space qualifiers are only supported
9772 in C with GNU extensions enabled. */
9773 if (c_dialect_objc () || flag_no_asm
)
9776 id
= get_identifier (word
);
9777 C_SET_RID_CODE (id
, rid
);
9778 C_IS_RESERVED_WORD (id
) = 1;
9779 ridpointers
[rid
] = id
;
9782 #include "gt-c-decl.h"