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, and we are processing more
1207 than one translation unit in this compilation, set
1208 DECL_CONTEXT of each decl to the TRANSLATION_UNIT_DECL.
1209 This makes same_translation_unit_p work, and causes
1210 static declarations to be given disambiguating suffixes. */
1211 if (scope
== file_scope
&& num_in_fnames
> 1)
1213 DECL_CONTEXT (p
) = context
;
1214 if (TREE_CODE (p
) == TYPE_DECL
)
1215 set_type_context (TREE_TYPE (p
), context
);
1219 /* Parameters go in DECL_ARGUMENTS, not BLOCK_VARS, and have
1220 already been put there by store_parm_decls. Unused-
1221 parameter warnings are handled by function.c.
1222 error_mark_node obviously does not go in BLOCK_VARS and
1223 does not get unused-variable warnings. */
1226 /* It is possible for a decl not to have a name. We get
1227 here with b->id NULL in this case. */
1230 gcc_assert (I_SYMBOL_BINDING (b
->id
) == b
);
1231 I_SYMBOL_BINDING (b
->id
) = b
->shadowed
;
1232 if (b
->shadowed
&& b
->shadowed
->u
.type
)
1233 TREE_TYPE (b
->shadowed
->decl
) = b
->shadowed
->u
.type
;
1243 /* Dispose of the block that we just made inside some higher level. */
1244 if ((scope
->function_body
|| scope
== file_scope
) && context
)
1246 DECL_INITIAL (context
) = block
;
1247 BLOCK_SUPERCONTEXT (block
) = context
;
1249 else if (scope
->outer
)
1252 SCOPE_LIST_APPEND (scope
->outer
, blocks
, block
);
1253 /* If we did not make a block for the scope just exited, any
1254 blocks made for inner scopes must be carried forward so they
1255 will later become subblocks of something else. */
1256 else if (scope
->blocks
)
1257 SCOPE_LIST_CONCAT (scope
->outer
, blocks
, scope
, blocks
);
1260 /* Pop the current scope, and free the structure for reuse. */
1261 current_scope
= scope
->outer
;
1262 if (scope
->function_body
)
1263 current_function_scope
= scope
->outer_function
;
1265 memset (scope
, 0, sizeof (struct c_scope
));
1266 scope
->outer
= scope_freelist
;
1267 scope_freelist
= scope
;
1273 push_file_scope (void)
1281 file_scope
= current_scope
;
1283 start_fname_decls ();
1285 for (decl
= visible_builtins
; decl
; decl
= DECL_CHAIN (decl
))
1286 bind (DECL_NAME (decl
), decl
, file_scope
,
1287 /*invisible=*/false, /*nested=*/true, DECL_SOURCE_LOCATION (decl
));
1291 pop_file_scope (void)
1293 /* In case there were missing closebraces, get us back to the global
1295 while (current_scope
!= file_scope
)
1298 /* __FUNCTION__ is defined at file scope (""). This
1299 call may not be necessary as my tests indicate it
1300 still works without it. */
1301 finish_fname_decls ();
1303 check_inline_statics ();
1305 /* This is the point to write out a PCH if we're doing that.
1306 In that case we do not want to do anything else. */
1309 c_common_write_pch ();
1313 /* Pop off the file scope and close this translation unit. */
1317 maybe_apply_pending_pragma_weaks ();
1320 /* Adjust the bindings for the start of a statement expression. */
1323 c_bindings_start_stmt_expr (struct c_spot_bindings
* switch_bindings
)
1325 struct c_scope
*scope
;
1327 for (scope
= current_scope
; scope
!= NULL
; scope
= scope
->outer
)
1329 struct c_binding
*b
;
1331 if (!scope
->has_label_bindings
)
1334 for (b
= scope
->bindings
; b
!= NULL
; b
= b
->prev
)
1336 struct c_label_vars
*label_vars
;
1338 struct c_goto_bindings
*g
;
1340 if (TREE_CODE (b
->decl
) != LABEL_DECL
)
1342 label_vars
= b
->u
.label
;
1343 ++label_vars
->label_bindings
.stmt_exprs
;
1344 FOR_EACH_VEC_ELT (c_goto_bindings_p
, label_vars
->gotos
, ix
, g
)
1345 ++g
->goto_bindings
.stmt_exprs
;
1349 if (switch_bindings
!= NULL
)
1350 ++switch_bindings
->stmt_exprs
;
1353 /* Adjust the bindings for the end of a statement expression. */
1356 c_bindings_end_stmt_expr (struct c_spot_bindings
*switch_bindings
)
1358 struct c_scope
*scope
;
1360 for (scope
= current_scope
; scope
!= NULL
; scope
= scope
->outer
)
1362 struct c_binding
*b
;
1364 if (!scope
->has_label_bindings
)
1367 for (b
= scope
->bindings
; b
!= NULL
; b
= b
->prev
)
1369 struct c_label_vars
*label_vars
;
1371 struct c_goto_bindings
*g
;
1373 if (TREE_CODE (b
->decl
) != LABEL_DECL
)
1375 label_vars
= b
->u
.label
;
1376 --label_vars
->label_bindings
.stmt_exprs
;
1377 if (label_vars
->label_bindings
.stmt_exprs
< 0)
1379 label_vars
->label_bindings
.left_stmt_expr
= true;
1380 label_vars
->label_bindings
.stmt_exprs
= 0;
1382 FOR_EACH_VEC_ELT (c_goto_bindings_p
, label_vars
->gotos
, ix
, g
)
1384 --g
->goto_bindings
.stmt_exprs
;
1385 if (g
->goto_bindings
.stmt_exprs
< 0)
1387 g
->goto_bindings
.left_stmt_expr
= true;
1388 g
->goto_bindings
.stmt_exprs
= 0;
1394 if (switch_bindings
!= NULL
)
1396 --switch_bindings
->stmt_exprs
;
1397 gcc_assert (switch_bindings
->stmt_exprs
>= 0);
1401 /* Push a definition or a declaration of struct, union or enum tag "name".
1402 "type" should be the type node.
1403 We assume that the tag "name" is not already defined, and has a location
1406 Note that the definition may really be just a forward reference.
1407 In that case, the TYPE_SIZE will be zero. */
1410 pushtag (location_t loc
, tree name
, tree type
)
1412 /* Record the identifier as the type's name if it has none. */
1413 if (name
&& !TYPE_NAME (type
))
1414 TYPE_NAME (type
) = name
;
1415 bind (name
, type
, current_scope
, /*invisible=*/false, /*nested=*/false, loc
);
1417 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1418 tagged type we just added to the current scope. This fake
1419 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1420 to output a representation of a tagged type, and it also gives
1421 us a convenient place to record the "scope start" address for the
1424 TYPE_STUB_DECL (type
) = pushdecl (build_decl (loc
,
1425 TYPE_DECL
, NULL_TREE
, type
));
1427 /* An approximation for now, so we can tell this is a function-scope tag.
1428 This will be updated in pop_scope. */
1429 TYPE_CONTEXT (type
) = DECL_CONTEXT (TYPE_STUB_DECL (type
));
1431 if (warn_cxx_compat
&& name
!= NULL_TREE
)
1433 struct c_binding
*b
= I_SYMBOL_BINDING (name
);
1436 && b
->decl
!= NULL_TREE
1437 && TREE_CODE (b
->decl
) == TYPE_DECL
1438 && (B_IN_CURRENT_SCOPE (b
)
1439 || (current_scope
== file_scope
&& B_IN_EXTERNAL_SCOPE (b
)))
1440 && (TYPE_MAIN_VARIANT (TREE_TYPE (b
->decl
))
1441 != TYPE_MAIN_VARIANT (type
)))
1443 warning_at (loc
, OPT_Wc___compat
,
1444 ("using %qD as both a typedef and a tag is "
1447 if (b
->locus
!= UNKNOWN_LOCATION
)
1448 inform (b
->locus
, "originally defined here");
1453 /* Subroutine of compare_decls. Allow harmless mismatches in return
1454 and argument types provided that the type modes match. This function
1455 return a unified type given a suitable match, and 0 otherwise. */
1458 match_builtin_function_types (tree newtype
, tree oldtype
)
1460 tree newrettype
, oldrettype
;
1461 tree newargs
, oldargs
;
1462 tree trytype
, tryargs
;
1464 /* Accept the return type of the new declaration if same modes. */
1465 oldrettype
= TREE_TYPE (oldtype
);
1466 newrettype
= TREE_TYPE (newtype
);
1468 if (TYPE_MODE (oldrettype
) != TYPE_MODE (newrettype
))
1471 oldargs
= TYPE_ARG_TYPES (oldtype
);
1472 newargs
= TYPE_ARG_TYPES (newtype
);
1475 while (oldargs
|| newargs
)
1479 || !TREE_VALUE (oldargs
)
1480 || !TREE_VALUE (newargs
)
1481 || TYPE_MODE (TREE_VALUE (oldargs
))
1482 != TYPE_MODE (TREE_VALUE (newargs
)))
1485 oldargs
= TREE_CHAIN (oldargs
);
1486 newargs
= TREE_CHAIN (newargs
);
1489 trytype
= build_function_type (newrettype
, tryargs
);
1490 return build_type_attribute_variant (trytype
, TYPE_ATTRIBUTES (oldtype
));
1493 /* Subroutine of diagnose_mismatched_decls. Check for function type
1494 mismatch involving an empty arglist vs a nonempty one and give clearer
1497 diagnose_arglist_conflict (tree newdecl
, tree olddecl
,
1498 tree newtype
, tree oldtype
)
1502 if (TREE_CODE (olddecl
) != FUNCTION_DECL
1503 || !comptypes (TREE_TYPE (oldtype
), TREE_TYPE (newtype
))
1504 || !((TYPE_ARG_TYPES (oldtype
) == 0 && DECL_INITIAL (olddecl
) == 0)
1506 (TYPE_ARG_TYPES (newtype
) == 0 && DECL_INITIAL (newdecl
) == 0)))
1509 t
= TYPE_ARG_TYPES (oldtype
);
1511 t
= TYPE_ARG_TYPES (newtype
);
1512 for (; t
; t
= TREE_CHAIN (t
))
1514 tree type
= TREE_VALUE (t
);
1516 if (TREE_CHAIN (t
) == 0
1517 && TYPE_MAIN_VARIANT (type
) != void_type_node
)
1519 inform (input_location
, "a parameter list with an ellipsis can%'t match "
1520 "an empty parameter name list declaration");
1524 if (c_type_promotes_to (type
) != type
)
1526 inform (input_location
, "an argument type that has a default promotion can%'t match "
1527 "an empty parameter name list declaration");
1533 /* Another subroutine of diagnose_mismatched_decls. OLDDECL is an
1534 old-style function definition, NEWDECL is a prototype declaration.
1535 Diagnose inconsistencies in the argument list. Returns TRUE if
1536 the prototype is compatible, FALSE if not. */
1538 validate_proto_after_old_defn (tree newdecl
, tree newtype
, tree oldtype
)
1540 tree newargs
, oldargs
;
1543 #define END_OF_ARGLIST(t) ((t) == void_type_node)
1545 oldargs
= TYPE_ACTUAL_ARG_TYPES (oldtype
);
1546 newargs
= TYPE_ARG_TYPES (newtype
);
1551 tree oldargtype
= TREE_VALUE (oldargs
);
1552 tree newargtype
= TREE_VALUE (newargs
);
1554 if (oldargtype
== error_mark_node
|| newargtype
== error_mark_node
)
1557 oldargtype
= TYPE_MAIN_VARIANT (oldargtype
);
1558 newargtype
= TYPE_MAIN_VARIANT (newargtype
);
1560 if (END_OF_ARGLIST (oldargtype
) && END_OF_ARGLIST (newargtype
))
1563 /* Reaching the end of just one list means the two decls don't
1564 agree on the number of arguments. */
1565 if (END_OF_ARGLIST (oldargtype
))
1567 error ("prototype for %q+D declares more arguments "
1568 "than previous old-style definition", newdecl
);
1571 else if (END_OF_ARGLIST (newargtype
))
1573 error ("prototype for %q+D declares fewer arguments "
1574 "than previous old-style definition", newdecl
);
1578 /* Type for passing arg must be consistent with that declared
1580 else if (!comptypes (oldargtype
, newargtype
))
1582 error ("prototype for %q+D declares argument %d"
1583 " with incompatible type",
1588 oldargs
= TREE_CHAIN (oldargs
);
1589 newargs
= TREE_CHAIN (newargs
);
1593 /* If we get here, no errors were found, but do issue a warning
1594 for this poor-style construct. */
1595 warning (0, "prototype for %q+D follows non-prototype definition",
1598 #undef END_OF_ARGLIST
1601 /* Subroutine of diagnose_mismatched_decls. Report the location of DECL,
1602 first in a pair of mismatched declarations, using the diagnostic
1605 locate_old_decl (tree decl
)
1607 if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_BUILT_IN (decl
))
1609 else if (DECL_INITIAL (decl
))
1610 inform (input_location
, "previous definition of %q+D was here", decl
);
1611 else if (C_DECL_IMPLICIT (decl
))
1612 inform (input_location
, "previous implicit declaration of %q+D was here", decl
);
1614 inform (input_location
, "previous declaration of %q+D was here", decl
);
1617 /* Subroutine of duplicate_decls. Compare NEWDECL to OLDDECL.
1618 Returns true if the caller should proceed to merge the two, false
1619 if OLDDECL should simply be discarded. As a side effect, issues
1620 all necessary diagnostics for invalid or poor-style combinations.
1621 If it returns true, writes the types of NEWDECL and OLDDECL to
1622 *NEWTYPEP and *OLDTYPEP - these may have been adjusted from
1623 TREE_TYPE (NEWDECL, OLDDECL) respectively. */
1626 diagnose_mismatched_decls (tree newdecl
, tree olddecl
,
1627 tree
*newtypep
, tree
*oldtypep
)
1629 tree newtype
, oldtype
;
1630 bool pedwarned
= false;
1631 bool warned
= false;
1634 #define DECL_EXTERN_INLINE(DECL) (DECL_DECLARED_INLINE_P (DECL) \
1635 && DECL_EXTERNAL (DECL))
1637 /* If we have error_mark_node for either decl or type, just discard
1638 the previous decl - we're in an error cascade already. */
1639 if (olddecl
== error_mark_node
|| newdecl
== error_mark_node
)
1641 *oldtypep
= oldtype
= TREE_TYPE (olddecl
);
1642 *newtypep
= newtype
= TREE_TYPE (newdecl
);
1643 if (oldtype
== error_mark_node
|| newtype
== error_mark_node
)
1646 /* Two different categories of symbol altogether. This is an error
1647 unless OLDDECL is a builtin. OLDDECL will be discarded in any case. */
1648 if (TREE_CODE (olddecl
) != TREE_CODE (newdecl
))
1650 if (!(TREE_CODE (olddecl
) == FUNCTION_DECL
1651 && DECL_BUILT_IN (olddecl
)
1652 && !C_DECL_DECLARED_BUILTIN (olddecl
)))
1654 error ("%q+D redeclared as different kind of symbol", newdecl
);
1655 locate_old_decl (olddecl
);
1657 else if (TREE_PUBLIC (newdecl
))
1658 warning (0, "built-in function %q+D declared as non-function",
1661 warning (OPT_Wshadow
, "declaration of %q+D shadows "
1662 "a built-in function", newdecl
);
1666 /* Enumerators have no linkage, so may only be declared once in a
1668 if (TREE_CODE (olddecl
) == CONST_DECL
)
1670 error ("redeclaration of enumerator %q+D", newdecl
);
1671 locate_old_decl (olddecl
);
1675 if (!comptypes (oldtype
, newtype
))
1677 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1678 && DECL_BUILT_IN (olddecl
) && !C_DECL_DECLARED_BUILTIN (olddecl
))
1680 /* Accept harmless mismatch in function types.
1681 This is for the ffs and fprintf builtins. */
1682 tree trytype
= match_builtin_function_types (newtype
, oldtype
);
1684 if (trytype
&& comptypes (newtype
, trytype
))
1685 *oldtypep
= oldtype
= trytype
;
1688 /* If types don't match for a built-in, throw away the
1689 built-in. No point in calling locate_old_decl here, it
1690 won't print anything. */
1691 warning (0, "conflicting types for built-in function %q+D",
1696 else if (TREE_CODE (olddecl
) == FUNCTION_DECL
1697 && DECL_IS_BUILTIN (olddecl
))
1699 /* A conflicting function declaration for a predeclared
1700 function that isn't actually built in. Objective C uses
1701 these. The new declaration silently overrides everything
1702 but the volatility (i.e. noreturn) indication. See also
1703 below. FIXME: Make Objective C use normal builtins. */
1704 TREE_THIS_VOLATILE (newdecl
) |= TREE_THIS_VOLATILE (olddecl
);
1707 /* Permit void foo (...) to match int foo (...) if the latter is
1708 the definition and implicit int was used. See
1709 c-torture/compile/920625-2.c. */
1710 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
&& DECL_INITIAL (newdecl
)
1711 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype
)) == void_type_node
1712 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype
)) == integer_type_node
1713 && C_FUNCTION_IMPLICIT_INT (newdecl
) && !DECL_INITIAL (olddecl
))
1715 pedwarned
= pedwarn (input_location
, 0,
1716 "conflicting types for %q+D", newdecl
);
1717 /* Make sure we keep void as the return type. */
1718 TREE_TYPE (newdecl
) = *newtypep
= newtype
= oldtype
;
1719 C_FUNCTION_IMPLICIT_INT (newdecl
) = 0;
1721 /* Permit void foo (...) to match an earlier call to foo (...) with
1722 no declared type (thus, implicitly int). */
1723 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
1724 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype
)) == void_type_node
1725 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype
)) == integer_type_node
1726 && C_DECL_IMPLICIT (olddecl
) && !DECL_INITIAL (olddecl
))
1728 pedwarned
= pedwarn (input_location
, 0,
1729 "conflicting types for %q+D", newdecl
);
1730 /* Make sure we keep void as the return type. */
1731 TREE_TYPE (olddecl
) = *oldtypep
= oldtype
= newtype
;
1735 int new_quals
= TYPE_QUALS (newtype
);
1736 int old_quals
= TYPE_QUALS (oldtype
);
1738 if (new_quals
!= old_quals
)
1740 addr_space_t new_addr
= DECODE_QUAL_ADDR_SPACE (new_quals
);
1741 addr_space_t old_addr
= DECODE_QUAL_ADDR_SPACE (old_quals
);
1742 if (new_addr
!= old_addr
)
1744 if (ADDR_SPACE_GENERIC_P (new_addr
))
1745 error ("conflicting named address spaces (generic vs %s) "
1747 c_addr_space_name (old_addr
), newdecl
);
1748 else if (ADDR_SPACE_GENERIC_P (old_addr
))
1749 error ("conflicting named address spaces (%s vs generic) "
1751 c_addr_space_name (new_addr
), newdecl
);
1753 error ("conflicting named address spaces (%s vs %s) "
1755 c_addr_space_name (new_addr
),
1756 c_addr_space_name (old_addr
),
1760 if (CLEAR_QUAL_ADDR_SPACE (new_quals
)
1761 != CLEAR_QUAL_ADDR_SPACE (old_quals
))
1762 error ("conflicting type qualifiers for %q+D", newdecl
);
1765 error ("conflicting types for %q+D", newdecl
);
1766 diagnose_arglist_conflict (newdecl
, olddecl
, newtype
, oldtype
);
1767 locate_old_decl (olddecl
);
1772 /* Redeclaration of a type is a constraint violation (6.7.2.3p1),
1773 but silently ignore the redeclaration if either is in a system
1774 header. (Conflicting redeclarations were handled above.) This
1775 is allowed for C1X if the types are the same, not just
1777 if (TREE_CODE (newdecl
) == TYPE_DECL
)
1779 bool types_different
= false;
1780 int comptypes_result
;
1783 = comptypes_check_different_types (oldtype
, newtype
, &types_different
);
1785 if (comptypes_result
!= 1 || types_different
)
1787 error ("redefinition of typedef %q+D with different type", newdecl
);
1788 locate_old_decl (olddecl
);
1792 if (DECL_IN_SYSTEM_HEADER (newdecl
)
1793 || DECL_IN_SYSTEM_HEADER (olddecl
)
1794 || TREE_NO_WARNING (newdecl
)
1795 || TREE_NO_WARNING (olddecl
))
1796 return true; /* Allow OLDDECL to continue in use. */
1798 if (pedantic
&& !flag_isoc1x
)
1800 pedwarn (input_location
, OPT_pedantic
,
1801 "redefinition of typedef %q+D", newdecl
);
1802 locate_old_decl (olddecl
);
1804 else if (variably_modified_type_p (newtype
, NULL
))
1806 /* Whether there is a constraint violation for the types not
1807 being the same cannot be determined at compile time; a
1808 warning that there may be one at runtime is considered
1809 appropriate (WG14 reflector message 11743, 8 May 2009). */
1810 warning (0, "redefinition of typedef %q+D may be a constraint "
1811 "violation at runtime", newdecl
);
1812 locate_old_decl (olddecl
);
1818 /* Function declarations can either be 'static' or 'extern' (no
1819 qualifier is equivalent to 'extern' - C99 6.2.2p5) and therefore
1820 can never conflict with each other on account of linkage
1821 (6.2.2p4). Multiple definitions are not allowed (6.9p3,5) but
1822 gnu89 mode permits two definitions if one is 'extern inline' and
1823 one is not. The non- extern-inline definition supersedes the
1824 extern-inline definition. */
1826 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1828 /* If you declare a built-in function name as static, or
1829 define the built-in with an old-style definition (so we
1830 can't validate the argument list) the built-in definition is
1831 overridden, but optionally warn this was a bad choice of name. */
1832 if (DECL_BUILT_IN (olddecl
)
1833 && !C_DECL_DECLARED_BUILTIN (olddecl
)
1834 && (!TREE_PUBLIC (newdecl
)
1835 || (DECL_INITIAL (newdecl
)
1836 && !TYPE_ARG_TYPES (TREE_TYPE (newdecl
)))))
1838 warning (OPT_Wshadow
, "declaration of %q+D shadows "
1839 "a built-in function", newdecl
);
1840 /* Discard the old built-in function. */
1844 if (DECL_INITIAL (newdecl
))
1846 if (DECL_INITIAL (olddecl
))
1848 /* If both decls are in the same TU and the new declaration
1849 isn't overriding an extern inline reject the new decl.
1850 In c99, no overriding is allowed in the same translation
1852 if ((!DECL_EXTERN_INLINE (olddecl
)
1853 || DECL_EXTERN_INLINE (newdecl
)
1854 || (!flag_gnu89_inline
1855 && (!DECL_DECLARED_INLINE_P (olddecl
)
1856 || !lookup_attribute ("gnu_inline",
1857 DECL_ATTRIBUTES (olddecl
)))
1858 && (!DECL_DECLARED_INLINE_P (newdecl
)
1859 || !lookup_attribute ("gnu_inline",
1860 DECL_ATTRIBUTES (newdecl
))))
1862 && same_translation_unit_p (newdecl
, olddecl
))
1864 error ("redefinition of %q+D", newdecl
);
1865 locate_old_decl (olddecl
);
1870 /* If we have a prototype after an old-style function definition,
1871 the argument types must be checked specially. */
1872 else if (DECL_INITIAL (olddecl
)
1873 && !TYPE_ARG_TYPES (oldtype
) && TYPE_ARG_TYPES (newtype
)
1874 && TYPE_ACTUAL_ARG_TYPES (oldtype
)
1875 && !validate_proto_after_old_defn (newdecl
, newtype
, oldtype
))
1877 locate_old_decl (olddecl
);
1880 /* A non-static declaration (even an "extern") followed by a
1881 static declaration is undefined behavior per C99 6.2.2p3-5,7.
1882 The same is true for a static forward declaration at block
1883 scope followed by a non-static declaration/definition at file
1884 scope. Static followed by non-static at the same scope is
1885 not undefined behavior, and is the most convenient way to get
1886 some effects (see e.g. what unwind-dw2-fde-glibc.c does to
1887 the definition of _Unwind_Find_FDE in unwind-dw2-fde.c), but
1888 we do diagnose it if -Wtraditional. */
1889 if (TREE_PUBLIC (olddecl
) && !TREE_PUBLIC (newdecl
))
1891 /* Two exceptions to the rule. If olddecl is an extern
1892 inline, or a predeclared function that isn't actually
1893 built in, newdecl silently overrides olddecl. The latter
1894 occur only in Objective C; see also above. (FIXME: Make
1895 Objective C use normal builtins.) */
1896 if (!DECL_IS_BUILTIN (olddecl
)
1897 && !DECL_EXTERN_INLINE (olddecl
))
1899 error ("static declaration of %q+D follows "
1900 "non-static declaration", newdecl
);
1901 locate_old_decl (olddecl
);
1905 else if (TREE_PUBLIC (newdecl
) && !TREE_PUBLIC (olddecl
))
1907 if (DECL_CONTEXT (olddecl
))
1909 error ("non-static declaration of %q+D follows "
1910 "static declaration", newdecl
);
1911 locate_old_decl (olddecl
);
1914 else if (warn_traditional
)
1916 warned
|= warning (OPT_Wtraditional
,
1917 "non-static declaration of %q+D "
1918 "follows static declaration", newdecl
);
1922 /* Make sure gnu_inline attribute is either not present, or
1923 present on all inline decls. */
1924 if (DECL_DECLARED_INLINE_P (olddecl
)
1925 && DECL_DECLARED_INLINE_P (newdecl
))
1927 bool newa
= lookup_attribute ("gnu_inline",
1928 DECL_ATTRIBUTES (newdecl
)) != NULL
;
1929 bool olda
= lookup_attribute ("gnu_inline",
1930 DECL_ATTRIBUTES (olddecl
)) != NULL
;
1933 error_at (input_location
, "%<gnu_inline%> attribute present on %q+D",
1934 newa
? newdecl
: olddecl
);
1935 error_at (DECL_SOURCE_LOCATION (newa
? olddecl
: newdecl
),
1940 else if (TREE_CODE (newdecl
) == VAR_DECL
)
1942 /* Only variables can be thread-local, and all declarations must
1943 agree on this property. */
1944 if (C_DECL_THREADPRIVATE_P (olddecl
) && !DECL_THREAD_LOCAL_P (newdecl
))
1946 /* Nothing to check. Since OLDDECL is marked threadprivate
1947 and NEWDECL does not have a thread-local attribute, we
1948 will merge the threadprivate attribute into NEWDECL. */
1951 else if (DECL_THREAD_LOCAL_P (newdecl
) != DECL_THREAD_LOCAL_P (olddecl
))
1953 if (DECL_THREAD_LOCAL_P (newdecl
))
1954 error ("thread-local declaration of %q+D follows "
1955 "non-thread-local declaration", newdecl
);
1957 error ("non-thread-local declaration of %q+D follows "
1958 "thread-local declaration", newdecl
);
1960 locate_old_decl (olddecl
);
1964 /* Multiple initialized definitions are not allowed (6.9p3,5). */
1965 if (DECL_INITIAL (newdecl
) && DECL_INITIAL (olddecl
))
1967 error ("redefinition of %q+D", newdecl
);
1968 locate_old_decl (olddecl
);
1972 /* Objects declared at file scope: if the first declaration had
1973 external linkage (even if it was an external reference) the
1974 second must have external linkage as well, or the behavior is
1975 undefined. If the first declaration had internal linkage, then
1976 the second must too, or else be an external reference (in which
1977 case the composite declaration still has internal linkage).
1978 As for function declarations, we warn about the static-then-
1979 extern case only for -Wtraditional. See generally 6.2.2p3-5,7. */
1980 if (DECL_FILE_SCOPE_P (newdecl
)
1981 && TREE_PUBLIC (newdecl
) != TREE_PUBLIC (olddecl
))
1983 if (DECL_EXTERNAL (newdecl
))
1985 if (!DECL_FILE_SCOPE_P (olddecl
))
1987 error ("extern declaration of %q+D follows "
1988 "declaration with no linkage", newdecl
);
1989 locate_old_decl (olddecl
);
1992 else if (warn_traditional
)
1994 warned
|= warning (OPT_Wtraditional
,
1995 "non-static declaration of %q+D "
1996 "follows static declaration", newdecl
);
2001 if (TREE_PUBLIC (newdecl
))
2002 error ("non-static declaration of %q+D follows "
2003 "static declaration", newdecl
);
2005 error ("static declaration of %q+D follows "
2006 "non-static declaration", newdecl
);
2008 locate_old_decl (olddecl
);
2012 /* Two objects with the same name declared at the same block
2013 scope must both be external references (6.7p3). */
2014 else if (!DECL_FILE_SCOPE_P (newdecl
))
2016 if (DECL_EXTERNAL (newdecl
))
2018 /* Extern with initializer at block scope, which will
2019 already have received an error. */
2021 else if (DECL_EXTERNAL (olddecl
))
2023 error ("declaration of %q+D with no linkage follows "
2024 "extern declaration", newdecl
);
2025 locate_old_decl (olddecl
);
2029 error ("redeclaration of %q+D with no linkage", newdecl
);
2030 locate_old_decl (olddecl
);
2036 /* C++ does not permit a decl to appear multiple times at file
2039 && DECL_FILE_SCOPE_P (newdecl
)
2040 && !DECL_EXTERNAL (newdecl
)
2041 && !DECL_EXTERNAL (olddecl
))
2042 warned
|= warning_at (DECL_SOURCE_LOCATION (newdecl
),
2044 ("duplicate declaration of %qD is "
2050 /* All decls must agree on a visibility. */
2051 if (CODE_CONTAINS_STRUCT (TREE_CODE (newdecl
), TS_DECL_WITH_VIS
)
2052 && DECL_VISIBILITY_SPECIFIED (newdecl
) && DECL_VISIBILITY_SPECIFIED (olddecl
)
2053 && DECL_VISIBILITY (newdecl
) != DECL_VISIBILITY (olddecl
))
2055 warned
|= warning (0, "redeclaration of %q+D with different visibility "
2056 "(old visibility preserved)", newdecl
);
2059 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2061 /* Diagnose inline __attribute__ ((noinline)) which is silly. */
2062 if (DECL_DECLARED_INLINE_P (newdecl
)
2063 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl
)))
2065 warned
|= warning (OPT_Wattributes
,
2066 "inline declaration of %qD follows "
2067 "declaration with attribute noinline", newdecl
);
2069 else if (DECL_DECLARED_INLINE_P (olddecl
)
2070 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl
)))
2072 warned
|= warning (OPT_Wattributes
,
2073 "declaration of %q+D with attribute "
2074 "noinline follows inline declaration ", newdecl
);
2077 else /* PARM_DECL, VAR_DECL */
2079 /* Redeclaration of a parameter is a constraint violation (this is
2080 not explicitly stated, but follows from C99 6.7p3 [no more than
2081 one declaration of the same identifier with no linkage in the
2082 same scope, except type tags] and 6.2.2p6 [parameters have no
2083 linkage]). We must check for a forward parameter declaration,
2084 indicated by TREE_ASM_WRITTEN on the old declaration - this is
2085 an extension, the mandatory diagnostic for which is handled by
2086 mark_forward_parm_decls. */
2088 if (TREE_CODE (newdecl
) == PARM_DECL
2089 && (!TREE_ASM_WRITTEN (olddecl
) || TREE_ASM_WRITTEN (newdecl
)))
2091 error ("redefinition of parameter %q+D", newdecl
);
2092 locate_old_decl (olddecl
);
2097 /* Optional warning for completely redundant decls. */
2098 if (!warned
&& !pedwarned
2099 && warn_redundant_decls
2100 /* Don't warn about a function declaration followed by a
2102 && !(TREE_CODE (newdecl
) == FUNCTION_DECL
2103 && DECL_INITIAL (newdecl
) && !DECL_INITIAL (olddecl
))
2104 /* Don't warn about redundant redeclarations of builtins. */
2105 && !(TREE_CODE (newdecl
) == FUNCTION_DECL
2106 && !DECL_BUILT_IN (newdecl
)
2107 && DECL_BUILT_IN (olddecl
)
2108 && !C_DECL_DECLARED_BUILTIN (olddecl
))
2109 /* Don't warn about an extern followed by a definition. */
2110 && !(DECL_EXTERNAL (olddecl
) && !DECL_EXTERNAL (newdecl
))
2111 /* Don't warn about forward parameter decls. */
2112 && !(TREE_CODE (newdecl
) == PARM_DECL
2113 && TREE_ASM_WRITTEN (olddecl
) && !TREE_ASM_WRITTEN (newdecl
))
2114 /* Don't warn about a variable definition following a declaration. */
2115 && !(TREE_CODE (newdecl
) == VAR_DECL
2116 && DECL_INITIAL (newdecl
) && !DECL_INITIAL (olddecl
)))
2118 warned
= warning (OPT_Wredundant_decls
, "redundant redeclaration of %q+D",
2122 /* Report location of previous decl/defn. */
2123 if (warned
|| pedwarned
)
2124 locate_old_decl (olddecl
);
2126 #undef DECL_EXTERN_INLINE
2131 /* Subroutine of duplicate_decls. NEWDECL has been found to be
2132 consistent with OLDDECL, but carries new information. Merge the
2133 new information into OLDDECL. This function issues no
2137 merge_decls (tree newdecl
, tree olddecl
, tree newtype
, tree oldtype
)
2139 bool new_is_definition
= (TREE_CODE (newdecl
) == FUNCTION_DECL
2140 && DECL_INITIAL (newdecl
) != 0);
2141 bool new_is_prototype
= (TREE_CODE (newdecl
) == FUNCTION_DECL
2142 && TYPE_ARG_TYPES (TREE_TYPE (newdecl
)) != 0);
2143 bool old_is_prototype
= (TREE_CODE (olddecl
) == FUNCTION_DECL
2144 && TYPE_ARG_TYPES (TREE_TYPE (olddecl
)) != 0);
2145 bool extern_changed
= false;
2147 /* For real parm decl following a forward decl, rechain the old decl
2148 in its new location and clear TREE_ASM_WRITTEN (it's not a
2149 forward decl anymore). */
2150 if (TREE_CODE (newdecl
) == PARM_DECL
2151 && TREE_ASM_WRITTEN (olddecl
) && !TREE_ASM_WRITTEN (newdecl
))
2153 struct c_binding
*b
, **here
;
2155 for (here
= ¤t_scope
->bindings
; *here
; here
= &(*here
)->prev
)
2156 if ((*here
)->decl
== olddecl
)
2163 b
->prev
= current_scope
->bindings
;
2164 current_scope
->bindings
= b
;
2166 TREE_ASM_WRITTEN (olddecl
) = 0;
2169 DECL_ATTRIBUTES (newdecl
)
2170 = targetm
.merge_decl_attributes (olddecl
, newdecl
);
2172 /* Merge the data types specified in the two decls. */
2174 = TREE_TYPE (olddecl
)
2175 = composite_type (newtype
, oldtype
);
2177 /* Lay the type out, unless already done. */
2178 if (!comptypes (oldtype
, TREE_TYPE (newdecl
)))
2180 if (TREE_TYPE (newdecl
) != error_mark_node
)
2181 layout_type (TREE_TYPE (newdecl
));
2182 if (TREE_CODE (newdecl
) != FUNCTION_DECL
2183 && TREE_CODE (newdecl
) != TYPE_DECL
2184 && TREE_CODE (newdecl
) != CONST_DECL
)
2185 layout_decl (newdecl
, 0);
2189 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
2190 DECL_SIZE (newdecl
) = DECL_SIZE (olddecl
);
2191 DECL_SIZE_UNIT (newdecl
) = DECL_SIZE_UNIT (olddecl
);
2192 DECL_MODE (newdecl
) = DECL_MODE (olddecl
);
2193 if (DECL_ALIGN (olddecl
) > DECL_ALIGN (newdecl
))
2195 DECL_ALIGN (newdecl
) = DECL_ALIGN (olddecl
);
2196 DECL_USER_ALIGN (newdecl
) |= DECL_USER_ALIGN (olddecl
);
2200 /* Keep the old rtl since we can safely use it. */
2201 if (HAS_RTL_P (olddecl
))
2202 COPY_DECL_RTL (olddecl
, newdecl
);
2204 /* Merge the type qualifiers. */
2205 if (TREE_READONLY (newdecl
))
2206 TREE_READONLY (olddecl
) = 1;
2208 if (TREE_THIS_VOLATILE (newdecl
))
2209 TREE_THIS_VOLATILE (olddecl
) = 1;
2211 /* Merge deprecatedness. */
2212 if (TREE_DEPRECATED (newdecl
))
2213 TREE_DEPRECATED (olddecl
) = 1;
2215 /* If a decl is in a system header and the other isn't, keep the one on the
2216 system header. Otherwise, keep source location of definition rather than
2217 declaration and of prototype rather than non-prototype unless that
2218 prototype is built-in. */
2219 if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl
), TS_DECL_WITH_VIS
)
2220 && DECL_IN_SYSTEM_HEADER (olddecl
)
2221 && !DECL_IN_SYSTEM_HEADER (newdecl
) )
2222 DECL_SOURCE_LOCATION (newdecl
) = DECL_SOURCE_LOCATION (olddecl
);
2223 else if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl
), TS_DECL_WITH_VIS
)
2224 && DECL_IN_SYSTEM_HEADER (newdecl
)
2225 && !DECL_IN_SYSTEM_HEADER (olddecl
))
2226 DECL_SOURCE_LOCATION (olddecl
) = DECL_SOURCE_LOCATION (newdecl
);
2227 else if ((DECL_INITIAL (newdecl
) == 0 && DECL_INITIAL (olddecl
) != 0)
2228 || (old_is_prototype
&& !new_is_prototype
2229 && !C_DECL_BUILTIN_PROTOTYPE (olddecl
)))
2230 DECL_SOURCE_LOCATION (newdecl
) = DECL_SOURCE_LOCATION (olddecl
);
2232 /* Merge the initialization information. */
2233 if (DECL_INITIAL (newdecl
) == 0)
2234 DECL_INITIAL (newdecl
) = DECL_INITIAL (olddecl
);
2236 /* Merge the threadprivate attribute. */
2237 if (TREE_CODE (olddecl
) == VAR_DECL
&& C_DECL_THREADPRIVATE_P (olddecl
))
2239 DECL_TLS_MODEL (newdecl
) = DECL_TLS_MODEL (olddecl
);
2240 C_DECL_THREADPRIVATE_P (newdecl
) = 1;
2243 if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl
), TS_DECL_WITH_VIS
))
2245 /* Merge the section attribute.
2246 We want to issue an error if the sections conflict but that
2247 must be done later in decl_attributes since we are called
2248 before attributes are assigned. */
2249 if (DECL_SECTION_NAME (newdecl
) == NULL_TREE
)
2250 DECL_SECTION_NAME (newdecl
) = DECL_SECTION_NAME (olddecl
);
2252 /* Copy the assembler name.
2253 Currently, it can only be defined in the prototype. */
2254 COPY_DECL_ASSEMBLER_NAME (olddecl
, newdecl
);
2256 /* Use visibility of whichever declaration had it specified */
2257 if (DECL_VISIBILITY_SPECIFIED (olddecl
))
2259 DECL_VISIBILITY (newdecl
) = DECL_VISIBILITY (olddecl
);
2260 DECL_VISIBILITY_SPECIFIED (newdecl
) = 1;
2263 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2265 DECL_STATIC_CONSTRUCTOR(newdecl
) |= DECL_STATIC_CONSTRUCTOR(olddecl
);
2266 DECL_STATIC_DESTRUCTOR (newdecl
) |= DECL_STATIC_DESTRUCTOR (olddecl
);
2267 DECL_NO_LIMIT_STACK (newdecl
) |= DECL_NO_LIMIT_STACK (olddecl
);
2268 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl
)
2269 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl
);
2270 TREE_THIS_VOLATILE (newdecl
) |= TREE_THIS_VOLATILE (olddecl
);
2271 DECL_IS_MALLOC (newdecl
) |= DECL_IS_MALLOC (olddecl
);
2272 DECL_IS_OPERATOR_NEW (newdecl
) |= DECL_IS_OPERATOR_NEW (olddecl
);
2273 TREE_READONLY (newdecl
) |= TREE_READONLY (olddecl
);
2274 DECL_PURE_P (newdecl
) |= DECL_PURE_P (olddecl
);
2275 DECL_IS_NOVOPS (newdecl
) |= DECL_IS_NOVOPS (olddecl
);
2278 /* Merge the storage class information. */
2279 merge_weak (newdecl
, olddecl
);
2281 /* For functions, static overrides non-static. */
2282 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2284 TREE_PUBLIC (newdecl
) &= TREE_PUBLIC (olddecl
);
2285 /* This is since we don't automatically
2286 copy the attributes of NEWDECL into OLDDECL. */
2287 TREE_PUBLIC (olddecl
) = TREE_PUBLIC (newdecl
);
2288 /* If this clears `static', clear it in the identifier too. */
2289 if (!TREE_PUBLIC (olddecl
))
2290 TREE_PUBLIC (DECL_NAME (olddecl
)) = 0;
2294 /* In c99, 'extern' declaration before (or after) 'inline' means this
2295 function is not DECL_EXTERNAL, unless 'gnu_inline' attribute
2297 if (TREE_CODE (newdecl
) == FUNCTION_DECL
2298 && !flag_gnu89_inline
2299 && (DECL_DECLARED_INLINE_P (newdecl
)
2300 || DECL_DECLARED_INLINE_P (olddecl
))
2301 && (!DECL_DECLARED_INLINE_P (newdecl
)
2302 || !DECL_DECLARED_INLINE_P (olddecl
)
2303 || !DECL_EXTERNAL (olddecl
))
2304 && DECL_EXTERNAL (newdecl
)
2305 && !lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (newdecl
))
2306 && !current_function_decl
)
2307 DECL_EXTERNAL (newdecl
) = 0;
2309 if (DECL_EXTERNAL (newdecl
))
2311 TREE_STATIC (newdecl
) = TREE_STATIC (olddecl
);
2312 DECL_EXTERNAL (newdecl
) = DECL_EXTERNAL (olddecl
);
2314 /* An extern decl does not override previous storage class. */
2315 TREE_PUBLIC (newdecl
) = TREE_PUBLIC (olddecl
);
2316 if (!DECL_EXTERNAL (newdecl
))
2318 DECL_CONTEXT (newdecl
) = DECL_CONTEXT (olddecl
);
2319 DECL_COMMON (newdecl
) = DECL_COMMON (olddecl
);
2324 TREE_STATIC (olddecl
) = TREE_STATIC (newdecl
);
2325 TREE_PUBLIC (olddecl
) = TREE_PUBLIC (newdecl
);
2328 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2330 /* If we're redefining a function previously defined as extern
2331 inline, make sure we emit debug info for the inline before we
2332 throw it away, in case it was inlined into a function that
2333 hasn't been written out yet. */
2334 if (new_is_definition
&& DECL_INITIAL (olddecl
))
2335 /* The new defn must not be inline. */
2336 DECL_UNINLINABLE (newdecl
) = 1;
2339 /* If either decl says `inline', this fn is inline, unless
2340 its definition was passed already. */
2341 if (DECL_DECLARED_INLINE_P (newdecl
)
2342 || DECL_DECLARED_INLINE_P (olddecl
))
2343 DECL_DECLARED_INLINE_P (newdecl
) = 1;
2345 DECL_UNINLINABLE (newdecl
) = DECL_UNINLINABLE (olddecl
)
2346 = (DECL_UNINLINABLE (newdecl
) || DECL_UNINLINABLE (olddecl
));
2348 DECL_DISREGARD_INLINE_LIMITS (newdecl
)
2349 = DECL_DISREGARD_INLINE_LIMITS (olddecl
)
2350 = (DECL_DISREGARD_INLINE_LIMITS (newdecl
)
2351 || DECL_DISREGARD_INLINE_LIMITS (olddecl
));
2354 if (DECL_BUILT_IN (olddecl
))
2356 /* If redeclaring a builtin function, it stays built in.
2357 But it gets tagged as having been declared. */
2358 DECL_BUILT_IN_CLASS (newdecl
) = DECL_BUILT_IN_CLASS (olddecl
);
2359 DECL_FUNCTION_CODE (newdecl
) = DECL_FUNCTION_CODE (olddecl
);
2360 C_DECL_DECLARED_BUILTIN (newdecl
) = 1;
2361 if (new_is_prototype
)
2362 C_DECL_BUILTIN_PROTOTYPE (newdecl
) = 0;
2364 C_DECL_BUILTIN_PROTOTYPE (newdecl
)
2365 = C_DECL_BUILTIN_PROTOTYPE (olddecl
);
2368 /* Preserve function specific target and optimization options */
2369 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl
)
2370 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl
))
2371 DECL_FUNCTION_SPECIFIC_TARGET (newdecl
)
2372 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl
);
2374 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl
)
2375 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl
))
2376 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl
)
2377 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl
);
2379 /* Also preserve various other info from the definition. */
2380 if (!new_is_definition
)
2383 DECL_RESULT (newdecl
) = DECL_RESULT (olddecl
);
2384 DECL_INITIAL (newdecl
) = DECL_INITIAL (olddecl
);
2385 DECL_STRUCT_FUNCTION (newdecl
) = DECL_STRUCT_FUNCTION (olddecl
);
2386 DECL_SAVED_TREE (newdecl
) = DECL_SAVED_TREE (olddecl
);
2387 DECL_ARGUMENTS (newdecl
) = copy_list (DECL_ARGUMENTS (olddecl
));
2388 for (t
= DECL_ARGUMENTS (newdecl
); t
; t
= DECL_CHAIN (t
))
2389 DECL_CONTEXT (t
) = newdecl
;
2391 /* See if we've got a function to instantiate from. */
2392 if (DECL_SAVED_TREE (olddecl
))
2393 DECL_ABSTRACT_ORIGIN (newdecl
)
2394 = DECL_ABSTRACT_ORIGIN (olddecl
);
2398 extern_changed
= DECL_EXTERNAL (olddecl
) && !DECL_EXTERNAL (newdecl
);
2400 /* Merge the USED information. */
2401 if (TREE_USED (olddecl
))
2402 TREE_USED (newdecl
) = 1;
2403 else if (TREE_USED (newdecl
))
2404 TREE_USED (olddecl
) = 1;
2405 if (TREE_CODE (olddecl
) == VAR_DECL
|| TREE_CODE (olddecl
) == PARM_DECL
)
2406 DECL_READ_P (newdecl
) |= DECL_READ_P (olddecl
);
2407 if (DECL_PRESERVE_P (olddecl
))
2408 DECL_PRESERVE_P (newdecl
) = 1;
2409 else if (DECL_PRESERVE_P (newdecl
))
2410 DECL_PRESERVE_P (olddecl
) = 1;
2412 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
2413 But preserve OLDDECL's DECL_UID, DECL_CONTEXT and
2414 DECL_ARGUMENTS (if appropriate). */
2416 unsigned olddecl_uid
= DECL_UID (olddecl
);
2417 tree olddecl_context
= DECL_CONTEXT (olddecl
);
2418 tree olddecl_arguments
= NULL
;
2419 if (TREE_CODE (olddecl
) == FUNCTION_DECL
)
2420 olddecl_arguments
= DECL_ARGUMENTS (olddecl
);
2422 memcpy ((char *) olddecl
+ sizeof (struct tree_common
),
2423 (char *) newdecl
+ sizeof (struct tree_common
),
2424 sizeof (struct tree_decl_common
) - sizeof (struct tree_common
));
2425 switch (TREE_CODE (olddecl
))
2435 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
2436 (char *) newdecl
+ sizeof (struct tree_decl_common
),
2437 tree_code_size (TREE_CODE (olddecl
)) - sizeof (struct tree_decl_common
));
2442 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
2443 (char *) newdecl
+ sizeof (struct tree_decl_common
),
2444 sizeof (struct tree_decl_non_common
) - sizeof (struct tree_decl_common
));
2446 DECL_UID (olddecl
) = olddecl_uid
;
2447 DECL_CONTEXT (olddecl
) = olddecl_context
;
2448 if (TREE_CODE (olddecl
) == FUNCTION_DECL
)
2449 DECL_ARGUMENTS (olddecl
) = olddecl_arguments
;
2452 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2453 so that encode_section_info has a chance to look at the new decl
2454 flags and attributes. */
2455 if (DECL_RTL_SET_P (olddecl
)
2456 && (TREE_CODE (olddecl
) == FUNCTION_DECL
2457 || (TREE_CODE (olddecl
) == VAR_DECL
2458 && TREE_STATIC (olddecl
))))
2459 make_decl_rtl (olddecl
);
2461 /* If we changed a function from DECL_EXTERNAL to !DECL_EXTERNAL,
2462 and the definition is coming from the old version, cgraph needs
2463 to be called again. */
2464 if (extern_changed
&& !new_is_definition
2465 && TREE_CODE (olddecl
) == FUNCTION_DECL
&& DECL_INITIAL (olddecl
))
2466 cgraph_mark_if_needed (olddecl
);
2469 /* Handle when a new declaration NEWDECL has the same name as an old
2470 one OLDDECL in the same binding contour. Prints an error message
2473 If safely possible, alter OLDDECL to look like NEWDECL, and return
2474 true. Otherwise, return false. */
2477 duplicate_decls (tree newdecl
, tree olddecl
)
2479 tree newtype
= NULL
, oldtype
= NULL
;
2481 if (!diagnose_mismatched_decls (newdecl
, olddecl
, &newtype
, &oldtype
))
2483 /* Avoid `unused variable' and other warnings for OLDDECL. */
2484 TREE_NO_WARNING (olddecl
) = 1;
2488 merge_decls (newdecl
, olddecl
, newtype
, oldtype
);
2493 /* Check whether decl-node NEW_DECL shadows an existing declaration. */
2495 warn_if_shadowing (tree new_decl
)
2497 struct c_binding
*b
;
2499 /* Shadow warnings wanted? */
2501 /* No shadow warnings for internally generated vars. */
2502 || DECL_IS_BUILTIN (new_decl
)
2503 /* No shadow warnings for vars made for inlining. */
2504 || DECL_FROM_INLINE (new_decl
))
2507 /* Is anything being shadowed? Invisible decls do not count. */
2508 for (b
= I_SYMBOL_BINDING (DECL_NAME (new_decl
)); b
; b
= b
->shadowed
)
2509 if (b
->decl
&& b
->decl
!= new_decl
&& !b
->invisible
)
2511 tree old_decl
= b
->decl
;
2513 if (old_decl
== error_mark_node
)
2515 warning (OPT_Wshadow
, "declaration of %q+D shadows previous "
2516 "non-variable", new_decl
);
2519 else if (TREE_CODE (old_decl
) == PARM_DECL
)
2520 warning (OPT_Wshadow
, "declaration of %q+D shadows a parameter",
2522 else if (DECL_FILE_SCOPE_P (old_decl
))
2523 warning (OPT_Wshadow
, "declaration of %q+D shadows a global "
2524 "declaration", new_decl
);
2525 else if (TREE_CODE (old_decl
) == FUNCTION_DECL
2526 && DECL_BUILT_IN (old_decl
))
2528 warning (OPT_Wshadow
, "declaration of %q+D shadows "
2529 "a built-in function", new_decl
);
2533 warning (OPT_Wshadow
, "declaration of %q+D shadows a previous local",
2536 warning_at (DECL_SOURCE_LOCATION (old_decl
), OPT_Wshadow
,
2537 "shadowed declaration is here");
2543 /* Record a decl-node X as belonging to the current lexical scope.
2544 Check for errors (such as an incompatible declaration for the same
2545 name already seen in the same scope).
2547 Returns either X or an old decl for the same name.
2548 If an old decl is returned, it may have been smashed
2549 to agree with what X says. */
2554 tree name
= DECL_NAME (x
);
2555 struct c_scope
*scope
= current_scope
;
2556 struct c_binding
*b
;
2557 bool nested
= false;
2558 location_t locus
= DECL_SOURCE_LOCATION (x
);
2560 /* Must set DECL_CONTEXT for everything not at file scope or
2561 DECL_FILE_SCOPE_P won't work. Local externs don't count
2562 unless they have initializers (which generate code). */
2563 if (current_function_decl
2564 && ((TREE_CODE (x
) != FUNCTION_DECL
&& TREE_CODE (x
) != VAR_DECL
)
2565 || DECL_INITIAL (x
) || !DECL_EXTERNAL (x
)))
2566 DECL_CONTEXT (x
) = current_function_decl
;
2568 /* Anonymous decls are just inserted in the scope. */
2571 bind (name
, x
, scope
, /*invisible=*/false, /*nested=*/false,
2576 /* First, see if there is another declaration with the same name in
2577 the current scope. If there is, duplicate_decls may do all the
2578 work for us. If duplicate_decls returns false, that indicates
2579 two incompatible decls in the same scope; we are to silently
2580 replace the old one (duplicate_decls has issued all appropriate
2581 diagnostics). In particular, we should not consider possible
2582 duplicates in the external scope, or shadowing. */
2583 b
= I_SYMBOL_BINDING (name
);
2584 if (b
&& B_IN_SCOPE (b
, scope
))
2586 struct c_binding
*b_ext
, *b_use
;
2587 tree type
= TREE_TYPE (x
);
2588 tree visdecl
= b
->decl
;
2589 tree vistype
= TREE_TYPE (visdecl
);
2590 if (TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
2591 && COMPLETE_TYPE_P (TREE_TYPE (x
)))
2592 b
->inner_comp
= false;
2595 /* If this is an external linkage declaration, we should check
2596 for compatibility with the type in the external scope before
2597 setting the type at this scope based on the visible
2598 information only. */
2599 if (TREE_PUBLIC (x
) && TREE_PUBLIC (visdecl
))
2601 while (b_ext
&& !B_IN_EXTERNAL_SCOPE (b_ext
))
2602 b_ext
= b_ext
->shadowed
;
2607 TREE_TYPE (b_use
->decl
) = b_use
->u
.type
;
2610 if (duplicate_decls (x
, b_use
->decl
))
2614 /* Save the updated type in the external scope and
2615 restore the proper type for this scope. */
2617 if (comptypes (vistype
, type
))
2618 thistype
= composite_type (vistype
, type
);
2620 thistype
= TREE_TYPE (b_use
->decl
);
2621 b_use
->u
.type
= TREE_TYPE (b_use
->decl
);
2622 if (TREE_CODE (b_use
->decl
) == FUNCTION_DECL
2623 && DECL_BUILT_IN (b_use
->decl
))
2625 = build_type_attribute_variant (thistype
,
2628 TREE_TYPE (b_use
->decl
) = thistype
;
2633 goto skip_external_and_shadow_checks
;
2636 /* All declarations with external linkage, and all external
2637 references, go in the external scope, no matter what scope is
2638 current. However, the binding in that scope is ignored for
2639 purposes of normal name lookup. A separate binding structure is
2640 created in the requested scope; this governs the normal
2641 visibility of the symbol.
2643 The binding in the externals scope is used exclusively for
2644 detecting duplicate declarations of the same object, no matter
2645 what scope they are in; this is what we do here. (C99 6.2.7p2:
2646 All declarations that refer to the same object or function shall
2647 have compatible type; otherwise, the behavior is undefined.) */
2648 if (DECL_EXTERNAL (x
) || scope
== file_scope
)
2650 tree type
= TREE_TYPE (x
);
2653 bool type_saved
= false;
2654 if (b
&& !B_IN_EXTERNAL_SCOPE (b
)
2655 && (TREE_CODE (b
->decl
) == FUNCTION_DECL
2656 || TREE_CODE (b
->decl
) == VAR_DECL
)
2657 && DECL_FILE_SCOPE_P (b
->decl
))
2660 vistype
= TREE_TYPE (visdecl
);
2662 if (scope
!= file_scope
2663 && !DECL_IN_SYSTEM_HEADER (x
))
2664 warning (OPT_Wnested_externs
, "nested extern declaration of %qD", x
);
2666 while (b
&& !B_IN_EXTERNAL_SCOPE (b
))
2668 /* If this decl might be modified, save its type. This is
2669 done here rather than when the decl is first bound
2670 because the type may change after first binding, through
2671 being completed or through attributes being added. If we
2672 encounter multiple such decls, only the first should have
2673 its type saved; the others will already have had their
2674 proper types saved and the types will not have changed as
2675 their scopes will not have been re-entered. */
2676 if (DECL_P (b
->decl
) && DECL_FILE_SCOPE_P (b
->decl
) && !type_saved
)
2678 b
->u
.type
= TREE_TYPE (b
->decl
);
2681 if (B_IN_FILE_SCOPE (b
)
2682 && TREE_CODE (b
->decl
) == VAR_DECL
2683 && TREE_STATIC (b
->decl
)
2684 && TREE_CODE (TREE_TYPE (b
->decl
)) == ARRAY_TYPE
2685 && !TYPE_DOMAIN (TREE_TYPE (b
->decl
))
2686 && TREE_CODE (type
) == ARRAY_TYPE
2687 && TYPE_DOMAIN (type
)
2688 && TYPE_MAX_VALUE (TYPE_DOMAIN (type
))
2689 && !integer_zerop (TYPE_MAX_VALUE (TYPE_DOMAIN (type
))))
2691 /* Array type completed in inner scope, which should be
2692 diagnosed if the completion does not have size 1 and
2693 it does not get completed in the file scope. */
2694 b
->inner_comp
= true;
2699 /* If a matching external declaration has been found, set its
2700 type to the composite of all the types of that declaration.
2701 After the consistency checks, it will be reset to the
2702 composite of the visible types only. */
2703 if (b
&& (TREE_PUBLIC (x
) || same_translation_unit_p (x
, b
->decl
))
2705 TREE_TYPE (b
->decl
) = b
->u
.type
;
2707 /* The point of the same_translation_unit_p check here is,
2708 we want to detect a duplicate decl for a construct like
2709 foo() { extern bar(); } ... static bar(); but not if
2710 they are in different translation units. In any case,
2711 the static does not go in the externals scope. */
2713 && (TREE_PUBLIC (x
) || same_translation_unit_p (x
, b
->decl
))
2714 && duplicate_decls (x
, b
->decl
))
2719 if (comptypes (vistype
, type
))
2720 thistype
= composite_type (vistype
, type
);
2722 thistype
= TREE_TYPE (b
->decl
);
2726 b
->u
.type
= TREE_TYPE (b
->decl
);
2727 if (TREE_CODE (b
->decl
) == FUNCTION_DECL
&& DECL_BUILT_IN (b
->decl
))
2729 = build_type_attribute_variant (thistype
,
2730 TYPE_ATTRIBUTES (b
->u
.type
));
2731 TREE_TYPE (b
->decl
) = thistype
;
2732 bind (name
, b
->decl
, scope
, /*invisible=*/false, /*nested=*/true,
2736 else if (TREE_PUBLIC (x
))
2738 if (visdecl
&& !b
&& duplicate_decls (x
, visdecl
))
2740 /* An external declaration at block scope referring to a
2741 visible entity with internal linkage. The composite
2742 type will already be correct for this scope, so we
2743 just need to fall through to make the declaration in
2750 bind (name
, x
, external_scope
, /*invisible=*/true,
2751 /*nested=*/false, locus
);
2757 if (TREE_CODE (x
) != PARM_DECL
)
2758 warn_if_shadowing (x
);
2760 skip_external_and_shadow_checks
:
2761 if (TREE_CODE (x
) == TYPE_DECL
)
2762 set_underlying_type (x
);
2764 bind (name
, x
, scope
, /*invisible=*/false, nested
, locus
);
2766 /* If x's type is incomplete because it's based on a
2767 structure or union which has not yet been fully declared,
2768 attach it to that structure or union type, so we can go
2769 back and complete the variable declaration later, if the
2770 structure or union gets fully declared.
2772 If the input is erroneous, we can have error_mark in the type
2773 slot (e.g. "f(void a, ...)") - that doesn't count as an
2775 if (TREE_TYPE (x
) != error_mark_node
2776 && !COMPLETE_TYPE_P (TREE_TYPE (x
)))
2778 tree element
= TREE_TYPE (x
);
2780 while (TREE_CODE (element
) == ARRAY_TYPE
)
2781 element
= TREE_TYPE (element
);
2782 element
= TYPE_MAIN_VARIANT (element
);
2784 if ((TREE_CODE (element
) == RECORD_TYPE
2785 || TREE_CODE (element
) == UNION_TYPE
)
2786 && (TREE_CODE (x
) != TYPE_DECL
2787 || TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
)
2788 && !COMPLETE_TYPE_P (element
))
2789 C_TYPE_INCOMPLETE_VARS (element
)
2790 = tree_cons (NULL_TREE
, x
, C_TYPE_INCOMPLETE_VARS (element
));
2795 /* Record X as belonging to file scope.
2796 This is used only internally by the Objective-C front end,
2797 and is limited to its needs. duplicate_decls is not called;
2798 if there is any preexisting decl for this identifier, it is an ICE. */
2801 pushdecl_top_level (tree x
)
2804 bool nested
= false;
2805 gcc_assert (TREE_CODE (x
) == VAR_DECL
|| TREE_CODE (x
) == CONST_DECL
);
2807 name
= DECL_NAME (x
);
2809 gcc_assert (TREE_CODE (x
) == CONST_DECL
|| !I_SYMBOL_BINDING (name
));
2811 if (TREE_PUBLIC (x
))
2813 bind (name
, x
, external_scope
, /*invisible=*/true, /*nested=*/false,
2818 bind (name
, x
, file_scope
, /*invisible=*/false, nested
, UNKNOWN_LOCATION
);
2824 implicit_decl_warning (tree id
, tree olddecl
)
2826 if (warn_implicit_function_declaration
)
2831 warned
= pedwarn (input_location
, OPT_Wimplicit_function_declaration
,
2832 "implicit declaration of function %qE", id
);
2834 warned
= warning (OPT_Wimplicit_function_declaration
,
2835 G_("implicit declaration of function %qE"), id
);
2836 if (olddecl
&& warned
)
2837 locate_old_decl (olddecl
);
2841 /* Generate an implicit declaration for identifier FUNCTIONID at LOC as a
2842 function of type int (). */
2845 implicitly_declare (location_t loc
, tree functionid
)
2847 struct c_binding
*b
;
2851 for (b
= I_SYMBOL_BINDING (functionid
); b
; b
= b
->shadowed
)
2853 if (B_IN_SCOPE (b
, external_scope
))
2862 if (decl
== error_mark_node
)
2865 /* FIXME: Objective-C has weird not-really-builtin functions
2866 which are supposed to be visible automatically. They wind up
2867 in the external scope because they're pushed before the file
2868 scope gets created. Catch this here and rebind them into the
2870 if (!DECL_BUILT_IN (decl
) && DECL_IS_BUILTIN (decl
))
2872 bind (functionid
, decl
, file_scope
,
2873 /*invisible=*/false, /*nested=*/true,
2874 DECL_SOURCE_LOCATION (decl
));
2879 tree newtype
= default_function_type
;
2881 TREE_TYPE (decl
) = b
->u
.type
;
2882 /* Implicit declaration of a function already declared
2883 (somehow) in a different scope, or as a built-in.
2884 If this is the first time this has happened, warn;
2885 then recycle the old declaration but with the new type. */
2886 if (!C_DECL_IMPLICIT (decl
))
2888 implicit_decl_warning (functionid
, decl
);
2889 C_DECL_IMPLICIT (decl
) = 1;
2891 if (DECL_BUILT_IN (decl
))
2893 newtype
= build_type_attribute_variant (newtype
,
2895 (TREE_TYPE (decl
)));
2896 if (!comptypes (newtype
, TREE_TYPE (decl
)))
2898 warning_at (loc
, 0, "incompatible implicit declaration of "
2899 "built-in function %qD", decl
);
2900 newtype
= TREE_TYPE (decl
);
2905 if (!comptypes (newtype
, TREE_TYPE (decl
)))
2907 error_at (loc
, "incompatible implicit declaration of function %qD", decl
);
2908 locate_old_decl (decl
);
2911 b
->u
.type
= TREE_TYPE (decl
);
2912 TREE_TYPE (decl
) = newtype
;
2913 bind (functionid
, decl
, current_scope
,
2914 /*invisible=*/false, /*nested=*/true,
2915 DECL_SOURCE_LOCATION (decl
));
2920 /* Not seen before. */
2921 decl
= build_decl (loc
, FUNCTION_DECL
, functionid
, default_function_type
);
2922 DECL_EXTERNAL (decl
) = 1;
2923 TREE_PUBLIC (decl
) = 1;
2924 C_DECL_IMPLICIT (decl
) = 1;
2925 implicit_decl_warning (functionid
, 0);
2926 asmspec_tree
= maybe_apply_renaming_pragma (decl
, /*asmname=*/NULL
);
2928 set_user_assembler_name (decl
, TREE_STRING_POINTER (asmspec_tree
));
2930 /* C89 says implicit declarations are in the innermost block.
2931 So we record the decl in the standard fashion. */
2932 decl
= pushdecl (decl
);
2934 /* No need to call objc_check_decl here - it's a function type. */
2935 rest_of_decl_compilation (decl
, 0, 0);
2937 /* Write a record describing this implicit function declaration
2938 to the prototypes file (if requested). */
2939 gen_aux_info_record (decl
, 0, 1, 0);
2941 /* Possibly apply some default attributes to this implicit declaration. */
2942 decl_attributes (&decl
, NULL_TREE
, 0);
2947 /* Issue an error message for a reference to an undeclared variable
2948 ID, including a reference to a builtin outside of function-call
2949 context. Establish a binding of the identifier to error_mark_node
2950 in an appropriate scope, which will suppress further errors for the
2951 same identifier. The error message should be given location LOC. */
2953 undeclared_variable (location_t loc
, tree id
)
2955 static bool already
= false;
2956 struct c_scope
*scope
;
2958 if (current_function_decl
== 0)
2960 error_at (loc
, "%qE undeclared here (not in a function)", id
);
2961 scope
= current_scope
;
2965 error_at (loc
, "%qE undeclared (first use in this function)", id
);
2968 inform (loc
, "each undeclared identifier is reported only"
2969 " once for each function it appears in");
2973 /* If we are parsing old-style parameter decls, current_function_decl
2974 will be nonnull but current_function_scope will be null. */
2975 scope
= current_function_scope
? current_function_scope
: current_scope
;
2977 bind (id
, error_mark_node
, scope
, /*invisible=*/false, /*nested=*/false,
2981 /* Subroutine of lookup_label, declare_label, define_label: construct a
2982 LABEL_DECL with all the proper frills. Also create a struct
2983 c_label_vars initialized for the current scope. */
2986 make_label (location_t location
, tree name
, bool defining
,
2987 struct c_label_vars
**p_label_vars
)
2989 tree label
= build_decl (location
, LABEL_DECL
, name
, void_type_node
);
2990 struct c_label_vars
*label_vars
;
2992 DECL_CONTEXT (label
) = current_function_decl
;
2993 DECL_MODE (label
) = VOIDmode
;
2995 label_vars
= ggc_alloc_c_label_vars ();
2996 label_vars
->shadowed
= NULL
;
2997 set_spot_bindings (&label_vars
->label_bindings
, defining
);
2998 label_vars
->decls_in_scope
= make_tree_vector ();
2999 label_vars
->gotos
= VEC_alloc (c_goto_bindings_p
, gc
, 0);
3000 *p_label_vars
= label_vars
;
3005 /* Get the LABEL_DECL corresponding to identifier NAME as a label.
3006 Create one if none exists so far for the current function.
3007 This is called when a label is used in a goto expression or
3008 has its address taken. */
3011 lookup_label (tree name
)
3014 struct c_label_vars
*label_vars
;
3016 if (current_function_decl
== 0)
3018 error ("label %qE referenced outside of any function", name
);
3022 /* Use a label already defined or ref'd with this name, but not if
3023 it is inherited from a containing function and wasn't declared
3025 label
= I_LABEL_DECL (name
);
3026 if (label
&& (DECL_CONTEXT (label
) == current_function_decl
3027 || C_DECLARED_LABEL_FLAG (label
)))
3029 /* If the label has only been declared, update its apparent
3030 location to point here, for better diagnostics if it
3031 turns out not to have been defined. */
3032 if (DECL_INITIAL (label
) == NULL_TREE
)
3033 DECL_SOURCE_LOCATION (label
) = input_location
;
3037 /* No label binding for that identifier; make one. */
3038 label
= make_label (input_location
, name
, false, &label_vars
);
3040 /* Ordinary labels go in the current function scope. */
3041 bind_label (name
, label
, current_function_scope
, label_vars
);
3046 /* Issue a warning about DECL for a goto statement at GOTO_LOC going
3050 warn_about_goto (location_t goto_loc
, tree label
, tree decl
)
3052 if (variably_modified_type_p (TREE_TYPE (decl
), NULL_TREE
))
3054 "jump into scope of identifier with variably modified type");
3056 warning_at (goto_loc
, OPT_Wjump_misses_init
,
3057 "jump skips variable initialization");
3058 inform (DECL_SOURCE_LOCATION (label
), "label %qD defined here", label
);
3059 inform (DECL_SOURCE_LOCATION (decl
), "%qD declared here", decl
);
3062 /* Look up a label because of a goto statement. This is like
3063 lookup_label, but also issues any appropriate warnings. */
3066 lookup_label_for_goto (location_t loc
, tree name
)
3069 struct c_label_vars
*label_vars
;
3073 label
= lookup_label (name
);
3074 if (label
== NULL_TREE
)
3077 /* If we are jumping to a different function, we can't issue any
3079 if (DECL_CONTEXT (label
) != current_function_decl
)
3081 gcc_assert (C_DECLARED_LABEL_FLAG (label
));
3085 label_vars
= I_LABEL_BINDING (name
)->u
.label
;
3087 /* If the label has not yet been defined, then push this goto on a
3088 list for possible later warnings. */
3089 if (label_vars
->label_bindings
.scope
== NULL
)
3091 struct c_goto_bindings
*g
;
3093 g
= ggc_alloc_c_goto_bindings ();
3095 set_spot_bindings (&g
->goto_bindings
, true);
3096 VEC_safe_push (c_goto_bindings_p
, gc
, label_vars
->gotos
, g
);
3100 /* If there are any decls in label_vars->decls_in_scope, then this
3101 goto has missed the declaration of the decl. This happens for a
3107 Issue a warning or error. */
3108 FOR_EACH_VEC_ELT (tree
, label_vars
->decls_in_scope
, ix
, decl
)
3109 warn_about_goto (loc
, label
, decl
);
3111 if (label_vars
->label_bindings
.left_stmt_expr
)
3113 error_at (loc
, "jump into statement expression");
3114 inform (DECL_SOURCE_LOCATION (label
), "label %qD defined here", label
);
3120 /* Make a label named NAME in the current function, shadowing silently
3121 any that may be inherited from containing functions or containing
3122 scopes. This is called for __label__ declarations. */
3125 declare_label (tree name
)
3127 struct c_binding
*b
= I_LABEL_BINDING (name
);
3129 struct c_label_vars
*label_vars
;
3131 /* Check to make sure that the label hasn't already been declared
3133 if (b
&& B_IN_CURRENT_SCOPE (b
))
3135 error ("duplicate label declaration %qE", name
);
3136 locate_old_decl (b
->decl
);
3138 /* Just use the previous declaration. */
3142 label
= make_label (input_location
, name
, false, &label_vars
);
3143 C_DECLARED_LABEL_FLAG (label
) = 1;
3145 /* Declared labels go in the current scope. */
3146 bind_label (name
, label
, current_scope
, label_vars
);
3151 /* When we define a label, issue any appropriate warnings if there are
3152 any gotos earlier in the function which jump to this label. */
3155 check_earlier_gotos (tree label
, struct c_label_vars
* label_vars
)
3158 struct c_goto_bindings
*g
;
3160 FOR_EACH_VEC_ELT (c_goto_bindings_p
, label_vars
->gotos
, ix
, g
)
3162 struct c_binding
*b
;
3163 struct c_scope
*scope
;
3165 /* We have a goto to this label. The goto is going forward. In
3166 g->scope, the goto is going to skip any binding which was
3167 defined after g->bindings_in_scope. */
3168 for (b
= g
->goto_bindings
.scope
->bindings
;
3169 b
!= g
->goto_bindings
.bindings_in_scope
;
3172 if (decl_jump_unsafe (b
->decl
))
3173 warn_about_goto (g
->loc
, label
, b
->decl
);
3176 /* We also need to warn about decls defined in any scopes
3177 between the scope of the label and the scope of the goto. */
3178 for (scope
= label_vars
->label_bindings
.scope
;
3179 scope
!= g
->goto_bindings
.scope
;
3180 scope
= scope
->outer
)
3182 gcc_assert (scope
!= NULL
);
3183 if (scope
== label_vars
->label_bindings
.scope
)
3184 b
= label_vars
->label_bindings
.bindings_in_scope
;
3186 b
= scope
->bindings
;
3187 for (; b
!= NULL
; b
= b
->prev
)
3189 if (decl_jump_unsafe (b
->decl
))
3190 warn_about_goto (g
->loc
, label
, b
->decl
);
3194 if (g
->goto_bindings
.stmt_exprs
> 0)
3196 error_at (g
->loc
, "jump into statement expression");
3197 inform (DECL_SOURCE_LOCATION (label
), "label %qD defined here",
3202 /* Now that the label is defined, we will issue warnings about
3203 subsequent gotos to this label when we see them. */
3204 VEC_truncate (c_goto_bindings_p
, label_vars
->gotos
, 0);
3205 label_vars
->gotos
= NULL
;
3208 /* Define a label, specifying the location in the source file.
3209 Return the LABEL_DECL node for the label, if the definition is valid.
3210 Otherwise return 0. */
3213 define_label (location_t location
, tree name
)
3215 /* Find any preexisting label with this name. It is an error
3216 if that label has already been defined in this function, or
3217 if there is a containing function with a declared label with
3219 tree label
= I_LABEL_DECL (name
);
3222 && ((DECL_CONTEXT (label
) == current_function_decl
3223 && DECL_INITIAL (label
) != 0)
3224 || (DECL_CONTEXT (label
) != current_function_decl
3225 && C_DECLARED_LABEL_FLAG (label
))))
3227 error_at (location
, "duplicate label %qD", label
);
3228 locate_old_decl (label
);
3231 else if (label
&& DECL_CONTEXT (label
) == current_function_decl
)
3233 struct c_label_vars
*label_vars
= I_LABEL_BINDING (name
)->u
.label
;
3235 /* The label has been used or declared already in this function,
3236 but not defined. Update its location to point to this
3238 DECL_SOURCE_LOCATION (label
) = location
;
3239 set_spot_bindings (&label_vars
->label_bindings
, true);
3241 /* Issue warnings as required about any goto statements from
3242 earlier in the function. */
3243 check_earlier_gotos (label
, label_vars
);
3247 struct c_label_vars
*label_vars
;
3249 /* No label binding for that identifier; make one. */
3250 label
= make_label (location
, name
, true, &label_vars
);
3252 /* Ordinary labels go in the current function scope. */
3253 bind_label (name
, label
, current_function_scope
, label_vars
);
3256 if (!in_system_header
&& lookup_name (name
))
3257 warning_at (location
, OPT_Wtraditional
,
3258 "traditional C lacks a separate namespace "
3259 "for labels, identifier %qE conflicts", name
);
3261 /* Mark label as having been defined. */
3262 DECL_INITIAL (label
) = error_mark_node
;
3266 /* Get the bindings for a new switch statement. This is used to issue
3267 warnings as appropriate for jumps from the switch to case or
3270 struct c_spot_bindings
*
3271 c_get_switch_bindings (void)
3273 struct c_spot_bindings
*switch_bindings
;
3275 switch_bindings
= XNEW (struct c_spot_bindings
);
3276 set_spot_bindings (switch_bindings
, true);
3277 return switch_bindings
;
3281 c_release_switch_bindings (struct c_spot_bindings
*bindings
)
3283 gcc_assert (bindings
->stmt_exprs
== 0 && !bindings
->left_stmt_expr
);
3287 /* This is called at the point of a case or default label to issue
3288 warnings about decls as needed. It returns true if it found an
3289 error, not just a warning. */
3292 c_check_switch_jump_warnings (struct c_spot_bindings
*switch_bindings
,
3293 location_t switch_loc
, location_t case_loc
)
3296 struct c_scope
*scope
;
3299 for (scope
= current_scope
;
3300 scope
!= switch_bindings
->scope
;
3301 scope
= scope
->outer
)
3303 struct c_binding
*b
;
3305 gcc_assert (scope
!= NULL
);
3306 for (b
= scope
->bindings
; b
!= NULL
; b
= b
->prev
)
3308 if (decl_jump_unsafe (b
->decl
))
3310 if (variably_modified_type_p (TREE_TYPE (b
->decl
), NULL_TREE
))
3314 ("switch jumps into scope of identifier with "
3315 "variably modified type"));
3318 warning_at (case_loc
, OPT_Wjump_misses_init
,
3319 "switch jumps over variable initialization");
3320 inform (switch_loc
, "switch starts here");
3321 inform (DECL_SOURCE_LOCATION (b
->decl
), "%qD declared here",
3327 if (switch_bindings
->stmt_exprs
> 0)
3330 error_at (case_loc
, "switch jumps into statement expression");
3331 inform (switch_loc
, "switch starts here");
3337 /* Given NAME, an IDENTIFIER_NODE,
3338 return the structure (or union or enum) definition for that name.
3339 If THISLEVEL_ONLY is nonzero, searches only the current_scope.
3340 CODE says which kind of type the caller wants;
3341 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
3342 If PLOC is not NULL and this returns non-null, it sets *PLOC to the
3343 location where the tag was defined.
3344 If the wrong kind of type is found, an error is reported. */
3347 lookup_tag (enum tree_code code
, tree name
, int thislevel_only
,
3350 struct c_binding
*b
= I_TAG_BINDING (name
);
3356 /* We only care about whether it's in this level if
3357 thislevel_only was set or it might be a type clash. */
3358 if (thislevel_only
|| TREE_CODE (b
->decl
) != code
)
3360 /* For our purposes, a tag in the external scope is the same as
3361 a tag in the file scope. (Primarily relevant to Objective-C
3362 and its builtin structure tags, which get pushed before the
3363 file scope is created.) */
3364 if (B_IN_CURRENT_SCOPE (b
)
3365 || (current_scope
== file_scope
&& B_IN_EXTERNAL_SCOPE (b
)))
3369 if (thislevel_only
&& !thislevel
)
3372 if (TREE_CODE (b
->decl
) != code
)
3374 /* Definition isn't the kind we were looking for. */
3375 pending_invalid_xref
= name
;
3376 pending_invalid_xref_location
= input_location
;
3378 /* If in the same binding level as a declaration as a tag
3379 of a different type, this must not be allowed to
3380 shadow that tag, so give the error immediately.
3381 (For example, "struct foo; union foo;" is invalid.) */
3383 pending_xref_error ();
3392 /* Print an error message now
3393 for a recent invalid struct, union or enum cross reference.
3394 We don't print them immediately because they are not invalid
3395 when used in the `struct foo;' construct for shadowing. */
3398 pending_xref_error (void)
3400 if (pending_invalid_xref
!= 0)
3401 error_at (pending_invalid_xref_location
, "%qE defined as wrong kind of tag",
3402 pending_invalid_xref
);
3403 pending_invalid_xref
= 0;
3407 /* Look up NAME in the current scope and its superiors
3408 in the namespace of variables, functions and typedefs.
3409 Return a ..._DECL node of some kind representing its definition,
3410 or return 0 if it is undefined. */
3413 lookup_name (tree name
)
3415 struct c_binding
*b
= I_SYMBOL_BINDING (name
);
3416 if (b
&& !b
->invisible
)
3421 /* Similar to `lookup_name' but look only at the indicated scope. */
3424 lookup_name_in_scope (tree name
, struct c_scope
*scope
)
3426 struct c_binding
*b
;
3428 for (b
= I_SYMBOL_BINDING (name
); b
; b
= b
->shadowed
)
3429 if (B_IN_SCOPE (b
, scope
))
3434 /* Create the predefined scalar types of C,
3435 and some nodes representing standard constants (0, 1, (void *) 0).
3436 Initialize the global scope.
3437 Make definitions for built-in primitive functions. */
3440 c_init_decl_processing (void)
3442 location_t save_loc
= input_location
;
3444 /* Initialize reserved words for parser. */
3447 current_function_decl
= 0;
3449 gcc_obstack_init (&parser_obstack
);
3451 /* Make the externals scope. */
3453 external_scope
= current_scope
;
3455 /* Declarations from c_common_nodes_and_builtins must not be associated
3456 with this input file, lest we get differences between using and not
3457 using preprocessed headers. */
3458 input_location
= BUILTINS_LOCATION
;
3460 build_common_tree_nodes (flag_signed_char
);
3462 c_common_nodes_and_builtins ();
3464 /* In C, comparisons and TRUTH_* expressions have type int. */
3465 truthvalue_type_node
= integer_type_node
;
3466 truthvalue_true_node
= integer_one_node
;
3467 truthvalue_false_node
= integer_zero_node
;
3469 /* Even in C99, which has a real boolean type. */
3470 pushdecl (build_decl (UNKNOWN_LOCATION
, TYPE_DECL
, get_identifier ("_Bool"),
3471 boolean_type_node
));
3473 input_location
= save_loc
;
3475 pedantic_lvalues
= true;
3477 make_fname_decl
= c_make_fname_decl
;
3478 start_fname_decls ();
3481 /* Create the VAR_DECL at LOC for __FUNCTION__ etc. ID is the name to
3482 give the decl, NAME is the initialization string and TYPE_DEP
3483 indicates whether NAME depended on the type of the function. As we
3484 don't yet implement delayed emission of static data, we mark the
3485 decl as emitted so it is not placed in the output. Anything using
3486 it must therefore pull out the STRING_CST initializer directly.
3490 c_make_fname_decl (location_t loc
, tree id
, int type_dep
)
3492 const char *name
= fname_as_string (type_dep
);
3493 tree decl
, type
, init
;
3494 size_t length
= strlen (name
);
3496 type
= build_array_type (char_type_node
,
3497 build_index_type (size_int (length
)));
3498 type
= c_build_qualified_type (type
, TYPE_QUAL_CONST
);
3500 decl
= build_decl (loc
, VAR_DECL
, id
, type
);
3502 TREE_STATIC (decl
) = 1;
3503 TREE_READONLY (decl
) = 1;
3504 DECL_ARTIFICIAL (decl
) = 1;
3506 init
= build_string (length
+ 1, name
);
3507 free (CONST_CAST (char *, name
));
3508 TREE_TYPE (init
) = type
;
3509 DECL_INITIAL (decl
) = init
;
3511 TREE_USED (decl
) = 1;
3513 if (current_function_decl
3514 /* For invalid programs like this:
3517 const char* p = __FUNCTION__;
3519 the __FUNCTION__ is believed to appear in K&R style function
3520 parameter declarator. In that case we still don't have
3522 && (!seen_error () || current_function_scope
))
3524 DECL_CONTEXT (decl
) = current_function_decl
;
3525 bind (id
, decl
, current_function_scope
,
3526 /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION
);
3529 finish_decl (decl
, loc
, init
, NULL_TREE
, NULL_TREE
);
3535 c_builtin_function (tree decl
)
3537 tree type
= TREE_TYPE (decl
);
3538 tree id
= DECL_NAME (decl
);
3540 const char *name
= IDENTIFIER_POINTER (id
);
3541 C_DECL_BUILTIN_PROTOTYPE (decl
) = (TYPE_ARG_TYPES (type
) != 0);
3543 /* Should never be called on a symbol with a preexisting meaning. */
3544 gcc_assert (!I_SYMBOL_BINDING (id
));
3546 bind (id
, decl
, external_scope
, /*invisible=*/true, /*nested=*/false,
3549 /* Builtins in the implementation namespace are made visible without
3550 needing to be explicitly declared. See push_file_scope. */
3551 if (name
[0] == '_' && (name
[1] == '_' || ISUPPER (name
[1])))
3553 DECL_CHAIN (decl
) = visible_builtins
;
3554 visible_builtins
= decl
;
3561 c_builtin_function_ext_scope (tree decl
)
3563 tree type
= TREE_TYPE (decl
);
3564 tree id
= DECL_NAME (decl
);
3566 const char *name
= IDENTIFIER_POINTER (id
);
3567 C_DECL_BUILTIN_PROTOTYPE (decl
) = (TYPE_ARG_TYPES (type
) != 0);
3569 /* Should never be called on a symbol with a preexisting meaning. */
3570 gcc_assert (!I_SYMBOL_BINDING (id
));
3572 bind (id
, decl
, external_scope
, /*invisible=*/false, /*nested=*/false,
3575 /* Builtins in the implementation namespace are made visible without
3576 needing to be explicitly declared. See push_file_scope. */
3577 if (name
[0] == '_' && (name
[1] == '_' || ISUPPER (name
[1])))
3579 DECL_CHAIN (decl
) = visible_builtins
;
3580 visible_builtins
= decl
;
3586 /* Called when a declaration is seen that contains no names to declare.
3587 If its type is a reference to a structure, union or enum inherited
3588 from a containing scope, shadow that tag name for the current scope
3589 with a forward reference.
3590 If its type defines a new named structure or union
3591 or defines an enum, it is valid but we need not do anything here.
3592 Otherwise, it is an error. */
3595 shadow_tag (const struct c_declspecs
*declspecs
)
3597 shadow_tag_warned (declspecs
, 0);
3600 /* WARNED is 1 if we have done a pedwarn, 2 if we have done a warning,
3603 shadow_tag_warned (const struct c_declspecs
*declspecs
, int warned
)
3605 bool found_tag
= false;
3607 if (declspecs
->type
&& !declspecs
->default_int_p
&& !declspecs
->typedef_p
)
3609 tree value
= declspecs
->type
;
3610 enum tree_code code
= TREE_CODE (value
);
3612 if (code
== RECORD_TYPE
|| code
== UNION_TYPE
|| code
== ENUMERAL_TYPE
)
3613 /* Used to test also that TYPE_SIZE (value) != 0.
3614 That caused warning for `struct foo;' at top level in the file. */
3616 tree name
= TYPE_NAME (value
);
3621 if (declspecs
->restrict_p
)
3623 error ("invalid use of %<restrict%>");
3629 if (warned
!= 1 && code
!= ENUMERAL_TYPE
)
3630 /* Empty unnamed enum OK */
3632 pedwarn (input_location
, 0,
3633 "unnamed struct/union that defines no instances");
3637 else if (!declspecs
->tag_defined_p
3638 && declspecs
->storage_class
!= csc_none
)
3641 pedwarn (input_location
, 0,
3642 "empty declaration with storage class specifier "
3643 "does not redeclare tag");
3645 pending_xref_error ();
3647 else if (!declspecs
->tag_defined_p
3648 && (declspecs
->const_p
3649 || declspecs
->volatile_p
3650 || declspecs
->restrict_p
3651 || declspecs
->address_space
))
3654 pedwarn (input_location
, 0,
3655 "empty declaration with type qualifier "
3656 "does not redeclare tag");
3658 pending_xref_error ();
3662 pending_invalid_xref
= 0;
3663 t
= lookup_tag (code
, name
, 1, NULL
);
3667 t
= make_node (code
);
3668 pushtag (input_location
, name
, t
);
3674 if (warned
!= 1 && !in_system_header
)
3676 pedwarn (input_location
, 0,
3677 "useless type name in empty declaration");
3682 else if (warned
!= 1 && !in_system_header
&& declspecs
->typedef_p
)
3684 pedwarn (input_location
, 0, "useless type name in empty declaration");
3688 pending_invalid_xref
= 0;
3690 if (declspecs
->inline_p
)
3692 error ("%<inline%> in empty declaration");
3696 if (current_scope
== file_scope
&& declspecs
->storage_class
== csc_auto
)
3698 error ("%<auto%> in file-scope empty declaration");
3702 if (current_scope
== file_scope
&& declspecs
->storage_class
== csc_register
)
3704 error ("%<register%> in file-scope empty declaration");
3708 if (!warned
&& !in_system_header
&& declspecs
->storage_class
!= csc_none
)
3710 warning (0, "useless storage class specifier in empty declaration");
3714 if (!warned
&& !in_system_header
&& declspecs
->thread_p
)
3716 warning (0, "useless %<__thread%> in empty declaration");
3720 if (!warned
&& !in_system_header
&& (declspecs
->const_p
3721 || declspecs
->volatile_p
3722 || declspecs
->restrict_p
3723 || declspecs
->address_space
))
3725 warning (0, "useless type qualifier in empty declaration");
3732 pedwarn (input_location
, 0, "empty declaration");
3737 /* Return the qualifiers from SPECS as a bitwise OR of TYPE_QUAL_*
3738 bits. SPECS represents declaration specifiers that the grammar
3739 only permits to contain type qualifiers and attributes. */
3742 quals_from_declspecs (const struct c_declspecs
*specs
)
3744 int quals
= ((specs
->const_p
? TYPE_QUAL_CONST
: 0)
3745 | (specs
->volatile_p
? TYPE_QUAL_VOLATILE
: 0)
3746 | (specs
->restrict_p
? TYPE_QUAL_RESTRICT
: 0)
3747 | (ENCODE_QUAL_ADDR_SPACE (specs
->address_space
)));
3748 gcc_assert (!specs
->type
3749 && !specs
->decl_attr
3750 && specs
->typespec_word
== cts_none
3751 && specs
->storage_class
== csc_none
3752 && !specs
->typedef_p
3753 && !specs
->explicit_signed_p
3754 && !specs
->deprecated_p
3756 && !specs
->long_long_p
3759 && !specs
->unsigned_p
3760 && !specs
->complex_p
3762 && !specs
->thread_p
);
3766 /* Construct an array declarator. LOC is the location of the
3767 beginning of the array (usually the opening brace). EXPR is the
3768 expression inside [], or NULL_TREE. QUALS are the type qualifiers
3769 inside the [] (to be applied to the pointer to which a parameter
3770 array is converted). STATIC_P is true if "static" is inside the
3771 [], false otherwise. VLA_UNSPEC_P is true if the array is [*], a
3772 VLA of unspecified length which is nevertheless a complete type,
3773 false otherwise. The field for the contained declarator is left to
3774 be filled in by set_array_declarator_inner. */
3776 struct c_declarator
*
3777 build_array_declarator (location_t loc
,
3778 tree expr
, struct c_declspecs
*quals
, bool static_p
,
3781 struct c_declarator
*declarator
= XOBNEW (&parser_obstack
,
3782 struct c_declarator
);
3783 declarator
->id_loc
= loc
;
3784 declarator
->kind
= cdk_array
;
3785 declarator
->declarator
= 0;
3786 declarator
->u
.array
.dimen
= expr
;
3789 declarator
->u
.array
.attrs
= quals
->attrs
;
3790 declarator
->u
.array
.quals
= quals_from_declspecs (quals
);
3794 declarator
->u
.array
.attrs
= NULL_TREE
;
3795 declarator
->u
.array
.quals
= 0;
3797 declarator
->u
.array
.static_p
= static_p
;
3798 declarator
->u
.array
.vla_unspec_p
= vla_unspec_p
;
3801 if (static_p
|| quals
!= NULL
)
3802 pedwarn (loc
, OPT_pedantic
,
3803 "ISO C90 does not support %<static%> or type "
3804 "qualifiers in parameter array declarators");
3806 pedwarn (loc
, OPT_pedantic
,
3807 "ISO C90 does not support %<[*]%> array declarators");
3811 if (!current_scope
->parm_flag
)
3814 error_at (loc
, "%<[*]%> not allowed in other than "
3815 "function prototype scope");
3816 declarator
->u
.array
.vla_unspec_p
= false;
3819 current_scope
->had_vla_unspec
= true;
3824 /* Set the contained declarator of an array declarator. DECL is the
3825 declarator, as constructed by build_array_declarator; INNER is what
3826 appears on the left of the []. */
3828 struct c_declarator
*
3829 set_array_declarator_inner (struct c_declarator
*decl
,
3830 struct c_declarator
*inner
)
3832 decl
->declarator
= inner
;
3836 /* INIT is a constructor that forms DECL's initializer. If the final
3837 element initializes a flexible array field, add the size of that
3838 initializer to DECL's size. */
3841 add_flexible_array_elts_to_size (tree decl
, tree init
)
3845 if (VEC_empty (constructor_elt
, CONSTRUCTOR_ELTS (init
)))
3848 elt
= VEC_last (constructor_elt
, CONSTRUCTOR_ELTS (init
))->value
;
3849 type
= TREE_TYPE (elt
);
3850 if (TREE_CODE (type
) == ARRAY_TYPE
3851 && TYPE_SIZE (type
) == NULL_TREE
3852 && TYPE_DOMAIN (type
) != NULL_TREE
3853 && TYPE_MAX_VALUE (TYPE_DOMAIN (type
)) == NULL_TREE
)
3855 complete_array_type (&type
, elt
, false);
3857 = size_binop (PLUS_EXPR
, DECL_SIZE (decl
), TYPE_SIZE (type
));
3858 DECL_SIZE_UNIT (decl
)
3859 = size_binop (PLUS_EXPR
, DECL_SIZE_UNIT (decl
), TYPE_SIZE_UNIT (type
));
3863 /* Decode a "typename", such as "int **", returning a ..._TYPE node.
3864 Set *EXPR, if EXPR not NULL, to any expression to be evaluated
3865 before the type name, and set *EXPR_CONST_OPERANDS, if
3866 EXPR_CONST_OPERANDS not NULL, to indicate whether the type name may
3867 appear in a constant expression. */
3870 groktypename (struct c_type_name
*type_name
, tree
*expr
,
3871 bool *expr_const_operands
)
3874 tree attrs
= type_name
->specs
->attrs
;
3876 type_name
->specs
->attrs
= NULL_TREE
;
3878 type
= grokdeclarator (type_name
->declarator
, type_name
->specs
, TYPENAME
,
3879 false, NULL
, &attrs
, expr
, expr_const_operands
,
3882 /* Apply attributes. */
3883 decl_attributes (&type
, attrs
, 0);
3888 /* Decode a declarator in an ordinary declaration or data definition.
3889 This is called as soon as the type information and variable name
3890 have been parsed, before parsing the initializer if any.
3891 Here we create the ..._DECL node, fill in its type,
3892 and put it on the list of decls for the current context.
3893 The ..._DECL node is returned as the value.
3895 Exception: for arrays where the length is not specified,
3896 the type is left null, to be filled in by `finish_decl'.
3898 Function definitions do not come here; they go to start_function
3899 instead. However, external and forward declarations of functions
3900 do go through here. Structure field declarations are done by
3901 grokfield and not through here. */
3904 start_decl (struct c_declarator
*declarator
, struct c_declspecs
*declspecs
,
3905 bool initialized
, tree attributes
)
3909 tree expr
= NULL_TREE
;
3910 enum deprecated_states deprecated_state
= DEPRECATED_NORMAL
;
3912 /* An object declared as __attribute__((deprecated)) suppresses
3913 warnings of uses of other deprecated items. */
3914 if (lookup_attribute ("deprecated", attributes
))
3915 deprecated_state
= DEPRECATED_SUPPRESS
;
3917 decl
= grokdeclarator (declarator
, declspecs
,
3918 NORMAL
, initialized
, NULL
, &attributes
, &expr
, NULL
,
3926 if (TREE_CODE (decl
) != FUNCTION_DECL
&& MAIN_NAME_P (DECL_NAME (decl
)))
3927 warning (OPT_Wmain
, "%q+D is usually a function", decl
);
3930 /* Is it valid for this decl to have an initializer at all?
3931 If not, set INITIALIZED to zero, which will indirectly
3932 tell 'finish_decl' to ignore the initializer once it is parsed. */
3933 switch (TREE_CODE (decl
))
3936 error ("typedef %qD is initialized (use __typeof__ instead)", decl
);
3941 error ("function %qD is initialized like a variable", decl
);
3946 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3947 error ("parameter %qD is initialized", decl
);
3952 /* Don't allow initializations for incomplete types except for
3953 arrays which might be completed by the initialization. */
3955 /* This can happen if the array size is an undefined macro.
3956 We already gave a warning, so we don't need another one. */
3957 if (TREE_TYPE (decl
) == error_mark_node
)
3959 else if (COMPLETE_TYPE_P (TREE_TYPE (decl
)))
3961 /* A complete type is ok if size is fixed. */
3963 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl
))) != INTEGER_CST
3964 || C_DECL_VARIABLE_SIZE (decl
))
3966 error ("variable-sized object may not be initialized");
3970 else if (TREE_CODE (TREE_TYPE (decl
)) != ARRAY_TYPE
)
3972 error ("variable %qD has initializer but incomplete type", decl
);
3975 else if (C_DECL_VARIABLE_SIZE (decl
))
3977 /* Although C99 is unclear about whether incomplete arrays
3978 of VLAs themselves count as VLAs, it does not make
3979 sense to permit them to be initialized given that
3980 ordinary VLAs may not be initialized. */
3981 error ("variable-sized object may not be initialized");
3988 if (current_scope
== file_scope
)
3989 TREE_STATIC (decl
) = 1;
3991 /* Tell 'pushdecl' this is an initialized decl
3992 even though we don't yet have the initializer expression.
3993 Also tell 'finish_decl' it may store the real initializer. */
3994 DECL_INITIAL (decl
) = error_mark_node
;
3997 /* If this is a function declaration, write a record describing it to the
3998 prototypes file (if requested). */
4000 if (TREE_CODE (decl
) == FUNCTION_DECL
)
4001 gen_aux_info_record (decl
, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl
)) != 0);
4003 /* ANSI specifies that a tentative definition which is not merged with
4004 a non-tentative definition behaves exactly like a definition with an
4005 initializer equal to zero. (Section 3.7.2)
4007 -fno-common gives strict ANSI behavior, though this tends to break
4008 a large body of code that grew up without this rule.
4010 Thread-local variables are never common, since there's no entrenched
4011 body of code to break, and it allows more efficient variable references
4012 in the presence of dynamic linking. */
4014 if (TREE_CODE (decl
) == VAR_DECL
4016 && TREE_PUBLIC (decl
)
4017 && !DECL_THREAD_LOCAL_P (decl
)
4019 DECL_COMMON (decl
) = 1;
4021 /* Set attributes here so if duplicate decl, will have proper attributes. */
4022 decl_attributes (&decl
, attributes
, 0);
4024 /* Handle gnu_inline attribute. */
4025 if (declspecs
->inline_p
4026 && !flag_gnu89_inline
4027 && TREE_CODE (decl
) == FUNCTION_DECL
4028 && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl
))
4029 || current_function_decl
))
4031 if (declspecs
->storage_class
== csc_auto
&& current_scope
!= file_scope
)
4033 else if (declspecs
->storage_class
!= csc_static
)
4034 DECL_EXTERNAL (decl
) = !DECL_EXTERNAL (decl
);
4037 if (TREE_CODE (decl
) == FUNCTION_DECL
4038 && targetm
.calls
.promote_prototypes (TREE_TYPE (decl
)))
4040 struct c_declarator
*ce
= declarator
;
4042 if (ce
->kind
== cdk_pointer
)
4043 ce
= declarator
->declarator
;
4044 if (ce
->kind
== cdk_function
)
4046 tree args
= ce
->u
.arg_info
->parms
;
4047 for (; args
; args
= DECL_CHAIN (args
))
4049 tree type
= TREE_TYPE (args
);
4050 if (type
&& INTEGRAL_TYPE_P (type
)
4051 && TYPE_PRECISION (type
) < TYPE_PRECISION (integer_type_node
))
4052 DECL_ARG_TYPE (args
) = integer_type_node
;
4057 if (TREE_CODE (decl
) == FUNCTION_DECL
4058 && DECL_DECLARED_INLINE_P (decl
)
4059 && DECL_UNINLINABLE (decl
)
4060 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl
)))
4061 warning (OPT_Wattributes
, "inline function %q+D given attribute noinline",
4064 /* C99 6.7.4p3: An inline definition of a function with external
4065 linkage shall not contain a definition of a modifiable object
4066 with static storage duration... */
4067 if (TREE_CODE (decl
) == VAR_DECL
4068 && current_scope
!= file_scope
4069 && TREE_STATIC (decl
)
4070 && !TREE_READONLY (decl
)
4071 && DECL_DECLARED_INLINE_P (current_function_decl
)
4072 && DECL_EXTERNAL (current_function_decl
))
4073 record_inline_static (input_location
, current_function_decl
,
4074 decl
, csi_modifiable
);
4076 /* Add this decl to the current scope.
4077 TEM may equal DECL or it may be a previous decl of the same name. */
4078 tem
= pushdecl (decl
);
4080 if (initialized
&& DECL_EXTERNAL (tem
))
4082 DECL_EXTERNAL (tem
) = 0;
4083 TREE_STATIC (tem
) = 1;
4089 /* Subroutine of finish_decl. TYPE is the type of an uninitialized object
4090 DECL or the non-array element type if DECL is an uninitialized array.
4091 If that type has a const member, diagnose this. */
4094 diagnose_uninitialized_cst_member (tree decl
, tree type
)
4097 for (field
= TYPE_FIELDS (type
); field
; field
= TREE_CHAIN (field
))
4100 if (TREE_CODE (field
) != FIELD_DECL
)
4102 field_type
= strip_array_types (TREE_TYPE (field
));
4104 if (TYPE_QUALS (field_type
) & TYPE_QUAL_CONST
)
4106 warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wc___compat
,
4107 "uninitialized const member in %qT is invalid in C++",
4108 strip_array_types (TREE_TYPE (decl
)));
4109 inform (DECL_SOURCE_LOCATION (field
), "%qD should be initialized", field
);
4112 if (TREE_CODE (field_type
) == RECORD_TYPE
4113 || TREE_CODE (field_type
) == UNION_TYPE
)
4114 diagnose_uninitialized_cst_member (decl
, field_type
);
4118 /* Finish processing of a declaration;
4119 install its initial value.
4120 If ORIGTYPE is not NULL_TREE, it is the original type of INIT.
4121 If the length of an array type is not known before,
4122 it must be determined now, from the initial value, or it is an error.
4124 INIT_LOC is the location of the initial value. */
4127 finish_decl (tree decl
, location_t init_loc
, tree init
,
4128 tree origtype
, tree asmspec_tree
)
4131 bool was_incomplete
= (DECL_SIZE (decl
) == 0);
4132 const char *asmspec
= 0;
4134 /* If a name was specified, get the string. */
4135 if ((TREE_CODE (decl
) == FUNCTION_DECL
|| TREE_CODE (decl
) == VAR_DECL
)
4136 && DECL_FILE_SCOPE_P (decl
))
4137 asmspec_tree
= maybe_apply_renaming_pragma (decl
, asmspec_tree
);
4139 asmspec
= TREE_STRING_POINTER (asmspec_tree
);
4141 if (TREE_CODE (decl
) == VAR_DECL
4142 && TREE_STATIC (decl
)
4143 && global_bindings_p ())
4144 /* So decl is a global variable. Record the types it uses
4145 so that we can decide later to emit debug info for them. */
4146 record_types_used_by_current_var_decl (decl
);
4148 /* If `start_decl' didn't like having an initialization, ignore it now. */
4149 if (init
!= 0 && DECL_INITIAL (decl
) == 0)
4152 /* Don't crash if parm is initialized. */
4153 if (TREE_CODE (decl
) == PARM_DECL
)
4157 store_init_value (init_loc
, decl
, init
, origtype
);
4159 if (c_dialect_objc () && (TREE_CODE (decl
) == VAR_DECL
4160 || TREE_CODE (decl
) == FUNCTION_DECL
4161 || TREE_CODE (decl
) == FIELD_DECL
))
4162 objc_check_decl (decl
);
4164 type
= TREE_TYPE (decl
);
4166 /* Deduce size of array from initialization, if not already known. */
4167 if (TREE_CODE (type
) == ARRAY_TYPE
4168 && TYPE_DOMAIN (type
) == 0
4169 && TREE_CODE (decl
) != TYPE_DECL
)
4172 = (TREE_STATIC (decl
)
4173 /* Even if pedantic, an external linkage array
4174 may have incomplete type at first. */
4175 ? pedantic
&& !TREE_PUBLIC (decl
)
4176 : !DECL_EXTERNAL (decl
));
4178 = complete_array_type (&TREE_TYPE (decl
), DECL_INITIAL (decl
),
4181 /* Get the completed type made by complete_array_type. */
4182 type
= TREE_TYPE (decl
);
4187 error ("initializer fails to determine size of %q+D", decl
);
4192 error ("array size missing in %q+D", decl
);
4193 /* If a `static' var's size isn't known,
4194 make it extern as well as static, so it does not get
4196 If it is not `static', then do not mark extern;
4197 finish_incomplete_decl will give it a default size
4198 and it will get allocated. */
4199 else if (!pedantic
&& TREE_STATIC (decl
) && !TREE_PUBLIC (decl
))
4200 DECL_EXTERNAL (decl
) = 1;
4204 error ("zero or negative size array %q+D", decl
);
4208 /* For global variables, update the copy of the type that
4209 exists in the binding. */
4210 if (TREE_PUBLIC (decl
))
4212 struct c_binding
*b_ext
= I_SYMBOL_BINDING (DECL_NAME (decl
));
4213 while (b_ext
&& !B_IN_EXTERNAL_SCOPE (b_ext
))
4214 b_ext
= b_ext
->shadowed
;
4218 b_ext
->u
.type
= composite_type (b_ext
->u
.type
, type
);
4220 b_ext
->u
.type
= type
;
4229 if (DECL_INITIAL (decl
))
4230 TREE_TYPE (DECL_INITIAL (decl
)) = type
;
4232 layout_decl (decl
, 0);
4235 if (TREE_CODE (decl
) == VAR_DECL
)
4237 if (init
&& TREE_CODE (init
) == CONSTRUCTOR
)
4238 add_flexible_array_elts_to_size (decl
, init
);
4240 if (DECL_SIZE (decl
) == 0 && TREE_TYPE (decl
) != error_mark_node
4241 && COMPLETE_TYPE_P (TREE_TYPE (decl
)))
4242 layout_decl (decl
, 0);
4244 if (DECL_SIZE (decl
) == 0
4245 /* Don't give an error if we already gave one earlier. */
4246 && TREE_TYPE (decl
) != error_mark_node
4247 && (TREE_STATIC (decl
)
4248 /* A static variable with an incomplete type
4249 is an error if it is initialized.
4250 Also if it is not file scope.
4251 Otherwise, let it through, but if it is not `extern'
4252 then it may cause an error message later. */
4253 ? (DECL_INITIAL (decl
) != 0
4254 || !DECL_FILE_SCOPE_P (decl
))
4255 /* An automatic variable with an incomplete type
4257 : !DECL_EXTERNAL (decl
)))
4259 error ("storage size of %q+D isn%'t known", decl
);
4260 TREE_TYPE (decl
) = error_mark_node
;
4263 if ((DECL_EXTERNAL (decl
) || TREE_STATIC (decl
))
4264 && DECL_SIZE (decl
) != 0)
4266 if (TREE_CODE (DECL_SIZE (decl
)) == INTEGER_CST
)
4267 constant_expression_warning (DECL_SIZE (decl
));
4270 error ("storage size of %q+D isn%'t constant", decl
);
4271 TREE_TYPE (decl
) = error_mark_node
;
4275 if (TREE_USED (type
))
4277 TREE_USED (decl
) = 1;
4278 DECL_READ_P (decl
) = 1;
4282 /* If this is a function and an assembler name is specified, reset DECL_RTL
4283 so we can give it its new name. Also, update built_in_decls if it
4284 was a normal built-in. */
4285 if (TREE_CODE (decl
) == FUNCTION_DECL
&& asmspec
)
4287 if (DECL_BUILT_IN_CLASS (decl
) == BUILT_IN_NORMAL
)
4288 set_builtin_user_assembler_name (decl
, asmspec
);
4289 set_user_assembler_name (decl
, asmspec
);
4292 /* If #pragma weak was used, mark the decl weak now. */
4293 maybe_apply_pragma_weak (decl
);
4295 /* Output the assembler code and/or RTL code for variables and functions,
4296 unless the type is an undefined structure or union.
4297 If not, it will get done when the type is completed. */
4299 if (TREE_CODE (decl
) == VAR_DECL
|| TREE_CODE (decl
) == FUNCTION_DECL
)
4301 /* Determine the ELF visibility. */
4302 if (TREE_PUBLIC (decl
))
4303 c_determine_visibility (decl
);
4305 /* This is a no-op in c-lang.c or something real in objc-act.c. */
4306 if (c_dialect_objc ())
4307 objc_check_decl (decl
);
4311 /* If this is not a static variable, issue a warning.
4312 It doesn't make any sense to give an ASMSPEC for an
4313 ordinary, non-register local variable. Historically,
4314 GCC has accepted -- but ignored -- the ASMSPEC in
4316 if (!DECL_FILE_SCOPE_P (decl
)
4317 && TREE_CODE (decl
) == VAR_DECL
4318 && !C_DECL_REGISTER (decl
)
4319 && !TREE_STATIC (decl
))
4320 warning (0, "ignoring asm-specifier for non-static local "
4321 "variable %q+D", decl
);
4323 set_user_assembler_name (decl
, asmspec
);
4326 if (DECL_FILE_SCOPE_P (decl
))
4328 if (DECL_INITIAL (decl
) == NULL_TREE
4329 || DECL_INITIAL (decl
) == error_mark_node
)
4330 /* Don't output anything
4331 when a tentative file-scope definition is seen.
4332 But at end of compilation, do output code for them. */
4333 DECL_DEFER_OUTPUT (decl
) = 1;
4334 rest_of_decl_compilation (decl
, true, 0);
4338 /* In conjunction with an ASMSPEC, the `register'
4339 keyword indicates that we should place the variable
4340 in a particular register. */
4341 if (asmspec
&& C_DECL_REGISTER (decl
))
4343 DECL_HARD_REGISTER (decl
) = 1;
4344 /* This cannot be done for a structure with volatile
4345 fields, on which DECL_REGISTER will have been
4347 if (!DECL_REGISTER (decl
))
4348 error ("cannot put object with volatile field into register");
4351 if (TREE_CODE (decl
) != FUNCTION_DECL
)
4353 /* If we're building a variable sized type, and we might be
4354 reachable other than via the top of the current binding
4355 level, then create a new BIND_EXPR so that we deallocate
4356 the object at the right time. */
4357 /* Note that DECL_SIZE can be null due to errors. */
4358 if (DECL_SIZE (decl
)
4359 && !TREE_CONSTANT (DECL_SIZE (decl
))
4360 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list
))
4363 bind
= build3 (BIND_EXPR
, void_type_node
, NULL
, NULL
, NULL
);
4364 TREE_SIDE_EFFECTS (bind
) = 1;
4366 BIND_EXPR_BODY (bind
) = push_stmt_list ();
4368 add_stmt (build_stmt (DECL_SOURCE_LOCATION (decl
),
4374 if (!DECL_FILE_SCOPE_P (decl
))
4376 /* Recompute the RTL of a local array now
4377 if it used to be an incomplete type. */
4379 && !TREE_STATIC (decl
) && !DECL_EXTERNAL (decl
))
4381 /* If we used it already as memory, it must stay in memory. */
4382 TREE_ADDRESSABLE (decl
) = TREE_USED (decl
);
4383 /* If it's still incomplete now, no init will save it. */
4384 if (DECL_SIZE (decl
) == 0)
4385 DECL_INITIAL (decl
) = 0;
4390 if (TREE_CODE (decl
) == TYPE_DECL
)
4392 if (!DECL_FILE_SCOPE_P (decl
)
4393 && variably_modified_type_p (TREE_TYPE (decl
), NULL_TREE
))
4394 add_stmt (build_stmt (DECL_SOURCE_LOCATION (decl
), DECL_EXPR
, decl
));
4396 rest_of_decl_compilation (decl
, DECL_FILE_SCOPE_P (decl
), 0);
4399 /* At the end of a declaration, throw away any variable type sizes
4400 of types defined inside that declaration. There is no use
4401 computing them in the following function definition. */
4402 if (current_scope
== file_scope
)
4403 get_pending_sizes ();
4405 /* Install a cleanup (aka destructor) if one was given. */
4406 if (TREE_CODE (decl
) == VAR_DECL
&& !TREE_STATIC (decl
))
4408 tree attr
= lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl
));
4411 tree cleanup_id
= TREE_VALUE (TREE_VALUE (attr
));
4412 tree cleanup_decl
= lookup_name (cleanup_id
);
4416 /* Build "cleanup(&decl)" for the destructor. */
4417 cleanup
= build_unary_op (input_location
, ADDR_EXPR
, decl
, 0);
4418 vec
= VEC_alloc (tree
, gc
, 1);
4419 VEC_quick_push (tree
, vec
, cleanup
);
4420 cleanup
= build_function_call_vec (DECL_SOURCE_LOCATION (decl
),
4421 cleanup_decl
, vec
, NULL
);
4422 VEC_free (tree
, gc
, vec
);
4424 /* Don't warn about decl unused; the cleanup uses it. */
4425 TREE_USED (decl
) = 1;
4426 TREE_USED (cleanup_decl
) = 1;
4427 DECL_READ_P (decl
) = 1;
4429 push_cleanup (decl
, cleanup
, false);
4434 && TREE_CODE (decl
) == VAR_DECL
4435 && !DECL_EXTERNAL (decl
)
4436 && DECL_INITIAL (decl
) == NULL_TREE
)
4438 type
= strip_array_types (type
);
4439 if (TREE_READONLY (decl
))
4440 warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wc___compat
,
4441 "uninitialized const %qD is invalid in C++", decl
);
4442 else if ((TREE_CODE (type
) == RECORD_TYPE
4443 || TREE_CODE (type
) == UNION_TYPE
)
4444 && C_TYPE_FIELDS_READONLY (type
))
4445 diagnose_uninitialized_cst_member (decl
, type
);
4449 /* Given a parsed parameter declaration, decode it into a PARM_DECL. */
4452 grokparm (const struct c_parm
*parm
)
4454 tree attrs
= parm
->attrs
;
4455 tree decl
= grokdeclarator (parm
->declarator
, parm
->specs
, PARM
, false,
4456 NULL
, &attrs
, NULL
, NULL
, DEPRECATED_NORMAL
);
4458 decl_attributes (&decl
, attrs
, 0);
4463 /* Given a parsed parameter declaration, decode it into a PARM_DECL
4464 and push that on the current scope. */
4467 push_parm_decl (const struct c_parm
*parm
)
4469 tree attrs
= parm
->attrs
;
4472 decl
= grokdeclarator (parm
->declarator
, parm
->specs
, PARM
, false, NULL
,
4473 &attrs
, NULL
, NULL
, DEPRECATED_NORMAL
);
4474 decl_attributes (&decl
, attrs
, 0);
4476 decl
= pushdecl (decl
);
4478 finish_decl (decl
, input_location
, NULL_TREE
, NULL_TREE
, NULL_TREE
);
4481 /* Mark all the parameter declarations to date as forward decls.
4482 Also diagnose use of this extension. */
4485 mark_forward_parm_decls (void)
4487 struct c_binding
*b
;
4489 if (pedantic
&& !current_scope
->warned_forward_parm_decls
)
4491 pedwarn (input_location
, OPT_pedantic
,
4492 "ISO C forbids forward parameter declarations");
4493 current_scope
->warned_forward_parm_decls
= true;
4496 for (b
= current_scope
->bindings
; b
; b
= b
->prev
)
4497 if (TREE_CODE (b
->decl
) == PARM_DECL
)
4498 TREE_ASM_WRITTEN (b
->decl
) = 1;
4501 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
4502 literal, which may be an incomplete array type completed by the
4503 initializer; INIT is a CONSTRUCTOR at LOC that initializes the compound
4504 literal. NON_CONST is true if the initializers contain something
4505 that cannot occur in a constant expression. */
4508 build_compound_literal (location_t loc
, tree type
, tree init
, bool non_const
)
4510 /* We do not use start_decl here because we have a type, not a declarator;
4511 and do not use finish_decl because the decl should be stored inside
4512 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_EXPR. */
4517 if (type
== error_mark_node
4518 || init
== error_mark_node
)
4519 return error_mark_node
;
4521 decl
= build_decl (loc
, VAR_DECL
, NULL_TREE
, type
);
4522 DECL_EXTERNAL (decl
) = 0;
4523 TREE_PUBLIC (decl
) = 0;
4524 TREE_STATIC (decl
) = (current_scope
== file_scope
);
4525 DECL_CONTEXT (decl
) = current_function_decl
;
4526 TREE_USED (decl
) = 1;
4527 DECL_READ_P (decl
) = 1;
4528 TREE_TYPE (decl
) = type
;
4529 TREE_READONLY (decl
) = TYPE_READONLY (type
);
4530 store_init_value (loc
, decl
, init
, NULL_TREE
);
4532 if (TREE_CODE (type
) == ARRAY_TYPE
&& !COMPLETE_TYPE_P (type
))
4534 int failure
= complete_array_type (&TREE_TYPE (decl
),
4535 DECL_INITIAL (decl
), true);
4536 gcc_assert (!failure
);
4538 type
= TREE_TYPE (decl
);
4539 TREE_TYPE (DECL_INITIAL (decl
)) = type
;
4542 if (type
== error_mark_node
|| !COMPLETE_TYPE_P (type
))
4543 return error_mark_node
;
4545 stmt
= build_stmt (DECL_SOURCE_LOCATION (decl
), DECL_EXPR
, decl
);
4546 complit
= build1 (COMPOUND_LITERAL_EXPR
, type
, stmt
);
4547 TREE_SIDE_EFFECTS (complit
) = 1;
4549 layout_decl (decl
, 0);
4551 if (TREE_STATIC (decl
))
4553 /* This decl needs a name for the assembler output. */
4554 set_compound_literal_name (decl
);
4555 DECL_DEFER_OUTPUT (decl
) = 1;
4556 DECL_COMDAT (decl
) = 1;
4557 DECL_ARTIFICIAL (decl
) = 1;
4558 DECL_IGNORED_P (decl
) = 1;
4560 rest_of_decl_compilation (decl
, 1, 0);
4565 complit
= build2 (C_MAYBE_CONST_EXPR
, type
, NULL
, complit
);
4566 C_MAYBE_CONST_EXPR_NON_CONST (complit
) = 1;
4572 /* Check the type of a compound literal. Here we just check that it
4573 is valid for C++. */
4576 check_compound_literal_type (location_t loc
, struct c_type_name
*type_name
)
4578 if (warn_cxx_compat
&& type_name
->specs
->tag_defined_p
)
4579 warning_at (loc
, OPT_Wc___compat
,
4580 "defining a type in a compound literal is invalid in C++");
4583 /* Determine whether TYPE is a structure with a flexible array member,
4584 or a union containing such a structure (possibly recursively). */
4587 flexible_array_type_p (tree type
)
4590 switch (TREE_CODE (type
))
4593 x
= TYPE_FIELDS (type
);
4596 while (DECL_CHAIN (x
) != NULL_TREE
)
4598 if (TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
4599 && TYPE_SIZE (TREE_TYPE (x
)) == NULL_TREE
4600 && TYPE_DOMAIN (TREE_TYPE (x
)) != NULL_TREE
4601 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x
))) == NULL_TREE
)
4605 for (x
= TYPE_FIELDS (type
); x
!= NULL_TREE
; x
= DECL_CHAIN (x
))
4607 if (flexible_array_type_p (TREE_TYPE (x
)))
4616 /* Performs sanity checks on the TYPE and WIDTH of the bit-field NAME,
4617 replacing with appropriate values if they are invalid. */
4619 check_bitfield_type_and_width (tree
*type
, tree
*width
, tree orig_name
)
4622 unsigned int max_width
;
4623 unsigned HOST_WIDE_INT w
;
4624 const char *name
= (orig_name
4625 ? identifier_to_locale (IDENTIFIER_POINTER (orig_name
))
4626 : _("<anonymous>"));
4628 /* Detect and ignore out of range field width and process valid
4630 if (!INTEGRAL_TYPE_P (TREE_TYPE (*width
)))
4632 error ("bit-field %qs width not an integer constant", name
);
4633 *width
= integer_one_node
;
4637 if (TREE_CODE (*width
) != INTEGER_CST
)
4639 *width
= c_fully_fold (*width
, false, NULL
);
4640 if (TREE_CODE (*width
) == INTEGER_CST
)
4641 pedwarn (input_location
, OPT_pedantic
,
4642 "bit-field %qs width not an integer constant expression",
4645 if (TREE_CODE (*width
) != INTEGER_CST
)
4647 error ("bit-field %qs width not an integer constant", name
);
4648 *width
= integer_one_node
;
4650 constant_expression_warning (*width
);
4651 if (tree_int_cst_sgn (*width
) < 0)
4653 error ("negative width in bit-field %qs", name
);
4654 *width
= integer_one_node
;
4656 else if (integer_zerop (*width
) && orig_name
)
4658 error ("zero width for bit-field %qs", name
);
4659 *width
= integer_one_node
;
4663 /* Detect invalid bit-field type. */
4664 if (TREE_CODE (*type
) != INTEGER_TYPE
4665 && TREE_CODE (*type
) != BOOLEAN_TYPE
4666 && TREE_CODE (*type
) != ENUMERAL_TYPE
)
4668 error ("bit-field %qs has invalid type", name
);
4669 *type
= unsigned_type_node
;
4672 type_mv
= TYPE_MAIN_VARIANT (*type
);
4673 if (!in_system_header
4674 && type_mv
!= integer_type_node
4675 && type_mv
!= unsigned_type_node
4676 && type_mv
!= boolean_type_node
)
4677 pedwarn (input_location
, OPT_pedantic
,
4678 "type of bit-field %qs is a GCC extension", name
);
4680 max_width
= TYPE_PRECISION (*type
);
4682 if (0 < compare_tree_int (*width
, max_width
))
4684 error ("width of %qs exceeds its type", name
);
4686 *width
= build_int_cst (NULL_TREE
, w
);
4689 w
= tree_low_cst (*width
, 1);
4691 if (TREE_CODE (*type
) == ENUMERAL_TYPE
)
4693 struct lang_type
*lt
= TYPE_LANG_SPECIFIC (*type
);
4695 || w
< tree_int_cst_min_precision (lt
->enum_min
, TYPE_UNSIGNED (*type
))
4696 || w
< tree_int_cst_min_precision (lt
->enum_max
, TYPE_UNSIGNED (*type
)))
4697 warning (0, "%qs is narrower than values of its type", name
);
4703 /* Print warning about variable length array if necessary. */
4706 warn_variable_length_array (tree name
, tree size
)
4708 int const_size
= TREE_CONSTANT (size
);
4710 if (!flag_isoc99
&& pedantic
&& warn_vla
!= 0)
4715 pedwarn (input_location
, OPT_Wvla
,
4716 "ISO C90 forbids array %qE whose size "
4717 "can%'t be evaluated",
4720 pedwarn (input_location
, OPT_Wvla
, "ISO C90 forbids array whose size "
4721 "can%'t be evaluated");
4726 pedwarn (input_location
, OPT_Wvla
,
4727 "ISO C90 forbids variable length array %qE",
4730 pedwarn (input_location
, OPT_Wvla
, "ISO C90 forbids variable length array");
4733 else if (warn_vla
> 0)
4739 "the size of array %qE can"
4740 "%'t be evaluated", name
);
4743 "the size of array can %'t be evaluated");
4749 "variable length array %qE is used",
4753 "variable length array is used");
4758 /* Given a size SIZE that may not be a constant, return a SAVE_EXPR to
4759 serve as the actual size-expression for a type or decl. This is
4760 like variable_size in stor-layout.c, but we make global_bindings_p
4761 return negative to avoid calls to that function from outside the
4762 front end resulting in errors at file scope, then call this version
4763 instead from front-end code. */
4766 c_variable_size (tree size
)
4770 if (TREE_CONSTANT (size
))
4773 size
= save_expr (size
);
4775 save
= skip_simple_arithmetic (size
);
4777 if (cfun
&& cfun
->dont_save_pending_sizes_p
)
4780 if (!global_bindings_p ())
4781 put_pending_size (save
);
4786 /* Given declspecs and a declarator,
4787 determine the name and type of the object declared
4788 and construct a ..._DECL node for it.
4789 (In one case we can return a ..._TYPE node instead.
4790 For invalid input we sometimes return 0.)
4792 DECLSPECS is a c_declspecs structure for the declaration specifiers.
4794 DECL_CONTEXT says which syntactic context this declaration is in:
4795 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
4796 FUNCDEF for a function definition. Like NORMAL but a few different
4797 error messages in each case. Return value may be zero meaning
4798 this definition is too screwy to try to parse.
4799 PARM for a parameter declaration (either within a function prototype
4800 or before a function body). Make a PARM_DECL, or return void_type_node.
4801 TYPENAME if for a typename (in a cast or sizeof).
4802 Don't make a DECL node; just return the ..._TYPE node.
4803 FIELD for a struct or union field; make a FIELD_DECL.
4804 INITIALIZED is true if the decl has an initializer.
4805 WIDTH is non-NULL for bit-fields, and is a pointer to an INTEGER_CST node
4806 representing the width of the bit-field.
4807 DECL_ATTRS points to the list of attributes that should be added to this
4808 decl. Any nested attributes that belong on the decl itself will be
4810 If EXPR is not NULL, any expressions that need to be evaluated as
4811 part of evaluating variably modified types will be stored in *EXPR.
4812 If EXPR_CONST_OPERANDS is not NULL, *EXPR_CONST_OPERANDS will be
4813 set to indicate whether operands in *EXPR can be used in constant
4815 DEPRECATED_STATE is a deprecated_states value indicating whether
4816 deprecation warnings should be suppressed.
4818 In the TYPENAME case, DECLARATOR is really an absolute declarator.
4819 It may also be so in the PARM case, for a prototype where the
4820 argument type is specified but not the name.
4822 This function is where the complicated C meanings of `static'
4823 and `extern' are interpreted. */
4826 grokdeclarator (const struct c_declarator
*declarator
,
4827 struct c_declspecs
*declspecs
,
4828 enum decl_context decl_context
, bool initialized
, tree
*width
,
4829 tree
*decl_attrs
, tree
*expr
, bool *expr_const_operands
,
4830 enum deprecated_states deprecated_state
)
4832 tree type
= declspecs
->type
;
4833 bool threadp
= declspecs
->thread_p
;
4834 enum c_storage_class storage_class
= declspecs
->storage_class
;
4838 int type_quals
= TYPE_UNQUALIFIED
;
4839 tree name
= NULL_TREE
;
4840 bool funcdef_flag
= false;
4841 bool funcdef_syntax
= false;
4842 bool size_varies
= false;
4843 tree decl_attr
= declspecs
->decl_attr
;
4844 int array_ptr_quals
= TYPE_UNQUALIFIED
;
4845 tree array_ptr_attrs
= NULL_TREE
;
4846 int array_parm_static
= 0;
4847 bool array_parm_vla_unspec_p
= false;
4848 tree returned_attrs
= NULL_TREE
;
4849 bool bitfield
= width
!= NULL
;
4851 struct c_arg_info
*arg_info
= 0;
4852 addr_space_t as1
, as2
, address_space
;
4853 location_t loc
= UNKNOWN_LOCATION
;
4856 bool expr_const_operands_dummy
;
4860 if (expr_const_operands
== NULL
)
4861 expr_const_operands
= &expr_const_operands_dummy
;
4863 *expr
= declspecs
->expr
;
4864 *expr_const_operands
= declspecs
->expr_const_operands
;
4866 if (decl_context
== FUNCDEF
)
4867 funcdef_flag
= true, decl_context
= NORMAL
;
4869 /* Look inside a declarator for the name being declared
4870 and get it as an IDENTIFIER_NODE, for an error message. */
4872 const struct c_declarator
*decl
= declarator
;
4883 funcdef_syntax
= (decl
->kind
== cdk_function
);
4884 decl
= decl
->declarator
;
4888 decl
= decl
->declarator
;
4903 gcc_assert (decl_context
== PARM
4904 || decl_context
== TYPENAME
4905 || (decl_context
== FIELD
4906 && declarator
->kind
== cdk_id
));
4907 gcc_assert (!initialized
);
4911 /* A function definition's declarator must have the form of
4912 a function declarator. */
4914 if (funcdef_flag
&& !funcdef_syntax
)
4917 /* If this looks like a function definition, make it one,
4918 even if it occurs where parms are expected.
4919 Then store_parm_decls will reject it and not use it as a parm. */
4920 if (decl_context
== NORMAL
&& !funcdef_flag
&& current_scope
->parm_flag
)
4921 decl_context
= PARM
;
4923 if (declspecs
->deprecated_p
&& deprecated_state
!= DEPRECATED_SUPPRESS
)
4924 warn_deprecated_use (declspecs
->type
, declspecs
->decl_attr
);
4926 if ((decl_context
== NORMAL
|| decl_context
== FIELD
)
4927 && current_scope
== file_scope
4928 && variably_modified_type_p (type
, NULL_TREE
))
4931 error_at (loc
, "variably modified %qE at file scope", name
);
4933 error_at (loc
, "variably modified field at file scope");
4934 type
= integer_type_node
;
4937 size_varies
= C_TYPE_VARIABLE_SIZE (type
) != 0;
4939 /* Diagnose defaulting to "int". */
4941 if (declspecs
->default_int_p
&& !in_system_header
)
4943 /* Issue a warning if this is an ISO C 99 program or if
4944 -Wreturn-type and this is a function, or if -Wimplicit;
4945 prefer the former warning since it is more explicit. */
4946 if ((warn_implicit_int
|| warn_return_type
|| flag_isoc99
)
4948 warn_about_return_type
= 1;
4952 pedwarn_c99 (loc
, flag_isoc99
? 0 : OPT_Wimplicit_int
,
4953 "type defaults to %<int%> in declaration of %qE",
4956 pedwarn_c99 (input_location
, flag_isoc99
? 0 : OPT_Wimplicit_int
,
4957 "type defaults to %<int%> in type name");
4961 /* Adjust the type if a bit-field is being declared,
4962 -funsigned-bitfields applied and the type is not explicitly
4964 if (bitfield
&& !flag_signed_bitfields
&& !declspecs
->explicit_signed_p
4965 && TREE_CODE (type
) == INTEGER_TYPE
)
4966 type
= unsigned_type_for (type
);
4968 /* Figure out the type qualifiers for the declaration. There are
4969 two ways a declaration can become qualified. One is something
4970 like `const int i' where the `const' is explicit. Another is
4971 something like `typedef const int CI; CI i' where the type of the
4972 declaration contains the `const'. A third possibility is that
4973 there is a type qualifier on the element type of a typedefed
4974 array type, in which case we should extract that qualifier so
4975 that c_apply_type_quals_to_decl receives the full list of
4976 qualifiers to work with (C90 is not entirely clear about whether
4977 duplicate qualifiers should be diagnosed in this case, but it
4978 seems most appropriate to do so). */
4979 element_type
= strip_array_types (type
);
4980 constp
= declspecs
->const_p
+ TYPE_READONLY (element_type
);
4981 restrictp
= declspecs
->restrict_p
+ TYPE_RESTRICT (element_type
);
4982 volatilep
= declspecs
->volatile_p
+ TYPE_VOLATILE (element_type
);
4983 as1
= declspecs
->address_space
;
4984 as2
= TYPE_ADDR_SPACE (element_type
);
4985 address_space
= ADDR_SPACE_GENERIC_P (as1
)? as2
: as1
;
4987 if (pedantic
&& !flag_isoc99
)
4990 pedwarn (loc
, OPT_pedantic
, "duplicate %<const%>");
4992 pedwarn (loc
, OPT_pedantic
, "duplicate %<restrict%>");
4994 pedwarn (loc
, OPT_pedantic
, "duplicate %<volatile%>");
4997 if (!ADDR_SPACE_GENERIC_P (as1
) && !ADDR_SPACE_GENERIC_P (as2
) && as1
!= as2
)
4998 error_at (loc
, "conflicting named address spaces (%s vs %s)",
4999 c_addr_space_name (as1
), c_addr_space_name (as2
));
5001 if (!flag_gen_aux_info
&& (TYPE_QUALS (element_type
)))
5002 type
= TYPE_MAIN_VARIANT (type
);
5003 type_quals
= ((constp
? TYPE_QUAL_CONST
: 0)
5004 | (restrictp
? TYPE_QUAL_RESTRICT
: 0)
5005 | (volatilep
? TYPE_QUAL_VOLATILE
: 0)
5006 | ENCODE_QUAL_ADDR_SPACE (address_space
));
5008 /* Warn about storage classes that are invalid for certain
5009 kinds of declarations (parameters, typenames, etc.). */
5013 || storage_class
== csc_auto
5014 || storage_class
== csc_register
5015 || storage_class
== csc_typedef
))
5017 if (storage_class
== csc_auto
)
5019 (current_scope
== file_scope
) ? 0 : OPT_pedantic
,
5020 "function definition declared %<auto%>");
5021 if (storage_class
== csc_register
)
5022 error_at (loc
, "function definition declared %<register%>");
5023 if (storage_class
== csc_typedef
)
5024 error_at (loc
, "function definition declared %<typedef%>");
5026 error_at (loc
, "function definition declared %<__thread%>");
5028 if (storage_class
== csc_auto
5029 || storage_class
== csc_register
5030 || storage_class
== csc_typedef
)
5031 storage_class
= csc_none
;
5033 else if (decl_context
!= NORMAL
&& (storage_class
!= csc_none
|| threadp
))
5035 if (decl_context
== PARM
&& storage_class
== csc_register
)
5039 switch (decl_context
)
5043 error_at (loc
, "storage class specified for structure "
5046 error_at (loc
, "storage class specified for structure field");
5050 error_at (loc
, "storage class specified for parameter %qE",
5053 error_at (loc
, "storage class specified for unnamed parameter");
5056 error_at (loc
, "storage class specified for typename");
5059 storage_class
= csc_none
;
5063 else if (storage_class
== csc_extern
5067 /* 'extern' with initialization is invalid if not at file scope. */
5068 if (current_scope
== file_scope
)
5070 /* It is fine to have 'extern const' when compiling at C
5071 and C++ intersection. */
5072 if (!(warn_cxx_compat
&& constp
))
5073 warning_at (loc
, 0, "%qE initialized and declared %<extern%>",
5077 error_at (loc
, "%qE has both %<extern%> and initializer", name
);
5079 else if (current_scope
== file_scope
)
5081 if (storage_class
== csc_auto
)
5082 error_at (loc
, "file-scope declaration of %qE specifies %<auto%>",
5084 if (pedantic
&& storage_class
== csc_register
)
5085 pedwarn (input_location
, OPT_pedantic
,
5086 "file-scope declaration of %qE specifies %<register%>", name
);
5090 if (storage_class
== csc_extern
&& funcdef_flag
)
5091 error_at (loc
, "nested function %qE declared %<extern%>", name
);
5092 else if (threadp
&& storage_class
== csc_none
)
5094 error_at (loc
, "function-scope %qE implicitly auto and declared "
5101 /* Now figure out the structure of the declarator proper.
5102 Descend through it, creating more complex types, until we reach
5103 the declared identifier (or NULL_TREE, in an absolute declarator).
5104 At each stage we maintain an unqualified version of the type
5105 together with any qualifiers that should be applied to it with
5106 c_build_qualified_type; this way, array types including
5107 multidimensional array types are first built up in unqualified
5108 form and then the qualified form is created with
5109 TYPE_MAIN_VARIANT pointing to the unqualified form. */
5111 while (declarator
&& declarator
->kind
!= cdk_id
)
5113 if (type
== error_mark_node
)
5115 declarator
= declarator
->declarator
;
5119 /* Each level of DECLARATOR is either a cdk_array (for ...[..]),
5120 a cdk_pointer (for *...),
5121 a cdk_function (for ...(...)),
5122 a cdk_attrs (for nested attributes),
5123 or a cdk_id (for the name being declared
5124 or the place in an absolute declarator
5125 where the name was omitted).
5126 For the last case, we have just exited the loop.
5128 At this point, TYPE is the type of elements of an array,
5129 or for a function to return, or for a pointer to point to.
5130 After this sequence of ifs, TYPE is the type of the
5131 array or function or pointer, and DECLARATOR has had its
5132 outermost layer removed. */
5134 if (array_ptr_quals
!= TYPE_UNQUALIFIED
5135 || array_ptr_attrs
!= NULL_TREE
5136 || array_parm_static
)
5138 /* Only the innermost declarator (making a parameter be of
5139 array type which is converted to pointer type)
5140 may have static or type qualifiers. */
5141 error_at (loc
, "static or type qualifiers in non-parameter array declarator");
5142 array_ptr_quals
= TYPE_UNQUALIFIED
;
5143 array_ptr_attrs
= NULL_TREE
;
5144 array_parm_static
= 0;
5147 switch (declarator
->kind
)
5151 /* A declarator with embedded attributes. */
5152 tree attrs
= declarator
->u
.attrs
;
5153 const struct c_declarator
*inner_decl
;
5155 declarator
= declarator
->declarator
;
5156 inner_decl
= declarator
;
5157 while (inner_decl
->kind
== cdk_attrs
)
5158 inner_decl
= inner_decl
->declarator
;
5159 if (inner_decl
->kind
== cdk_id
)
5160 attr_flags
|= (int) ATTR_FLAG_DECL_NEXT
;
5161 else if (inner_decl
->kind
== cdk_function
)
5162 attr_flags
|= (int) ATTR_FLAG_FUNCTION_NEXT
;
5163 else if (inner_decl
->kind
== cdk_array
)
5164 attr_flags
|= (int) ATTR_FLAG_ARRAY_NEXT
;
5165 returned_attrs
= decl_attributes (&type
,
5166 chainon (returned_attrs
, attrs
),
5172 tree itype
= NULL_TREE
;
5173 tree size
= declarator
->u
.array
.dimen
;
5174 /* The index is a signed object `sizetype' bits wide. */
5175 tree index_type
= c_common_signed_type (sizetype
);
5177 array_ptr_quals
= declarator
->u
.array
.quals
;
5178 array_ptr_attrs
= declarator
->u
.array
.attrs
;
5179 array_parm_static
= declarator
->u
.array
.static_p
;
5180 array_parm_vla_unspec_p
= declarator
->u
.array
.vla_unspec_p
;
5182 declarator
= declarator
->declarator
;
5184 /* Check for some types that there cannot be arrays of. */
5186 if (VOID_TYPE_P (type
))
5189 error_at (loc
, "declaration of %qE as array of voids", name
);
5191 error_at (loc
, "declaration of type name as array of voids");
5192 type
= error_mark_node
;
5195 if (TREE_CODE (type
) == FUNCTION_TYPE
)
5198 error_at (loc
, "declaration of %qE as array of functions",
5201 error_at (loc
, "declaration of type name as array of "
5203 type
= error_mark_node
;
5206 if (pedantic
&& !in_system_header
&& flexible_array_type_p (type
))
5207 pedwarn (loc
, OPT_pedantic
,
5208 "invalid use of structure with flexible array member");
5210 if (size
== error_mark_node
)
5211 type
= error_mark_node
;
5213 if (type
== error_mark_node
)
5216 /* If size was specified, set ITYPE to a range-type for
5217 that size. Otherwise, ITYPE remains null. finish_decl
5218 may figure it out from an initial value. */
5222 bool size_maybe_const
= true;
5223 bool size_int_const
= (TREE_CODE (size
) == INTEGER_CST
5224 && !TREE_OVERFLOW (size
));
5225 bool this_size_varies
= false;
5227 /* Strip NON_LVALUE_EXPRs since we aren't using as an
5229 STRIP_TYPE_NOPS (size
);
5231 if (!INTEGRAL_TYPE_P (TREE_TYPE (size
)))
5234 error_at (loc
, "size of array %qE has non-integer type",
5238 "size of unnamed array has non-integer type");
5239 size
= integer_one_node
;
5242 size
= c_fully_fold (size
, false, &size_maybe_const
);
5244 if (pedantic
&& size_maybe_const
&& integer_zerop (size
))
5247 pedwarn (loc
, OPT_pedantic
,
5248 "ISO C forbids zero-size array %qE", name
);
5250 pedwarn (loc
, OPT_pedantic
,
5251 "ISO C forbids zero-size array");
5254 if (TREE_CODE (size
) == INTEGER_CST
&& size_maybe_const
)
5256 constant_expression_warning (size
);
5257 if (tree_int_cst_sgn (size
) < 0)
5260 error_at (loc
, "size of array %qE is negative", name
);
5262 error_at (loc
, "size of unnamed array is negative");
5263 size
= integer_one_node
;
5265 /* Handle a size folded to an integer constant but
5266 not an integer constant expression. */
5267 if (!size_int_const
)
5269 /* If this is a file scope declaration of an
5270 ordinary identifier, this is invalid code;
5271 diagnosing it here and not subsequently
5272 treating the type as variable-length avoids
5273 more confusing diagnostics later. */
5274 if ((decl_context
== NORMAL
|| decl_context
== FIELD
)
5275 && current_scope
== file_scope
)
5276 pedwarn (input_location
, 0,
5277 "variably modified %qE at file scope",
5280 this_size_varies
= size_varies
= true;
5281 warn_variable_length_array (name
, size
);
5284 else if ((decl_context
== NORMAL
|| decl_context
== FIELD
)
5285 && current_scope
== file_scope
)
5287 error_at (loc
, "variably modified %qE at file scope", name
);
5288 size
= integer_one_node
;
5292 /* Make sure the array size remains visibly
5293 nonconstant even if it is (eg) a const variable
5294 with known value. */
5295 this_size_varies
= size_varies
= true;
5296 warn_variable_length_array (name
, size
);
5299 if (integer_zerop (size
) && !this_size_varies
)
5301 /* A zero-length array cannot be represented with
5302 an unsigned index type, which is what we'll
5303 get with build_index_type. Create an
5304 open-ended range instead. */
5305 itype
= build_range_type (sizetype
, size
, NULL_TREE
);
5309 /* Arrange for the SAVE_EXPR on the inside of the
5310 MINUS_EXPR, which allows the -1 to get folded
5311 with the +1 that happens when building TYPE_SIZE. */
5313 size
= c_variable_size (size
);
5314 if (this_size_varies
&& TREE_CODE (size
) == INTEGER_CST
)
5315 size
= build2 (COMPOUND_EXPR
, TREE_TYPE (size
),
5316 integer_zero_node
, size
);
5318 /* Compute the maximum valid index, that is, size
5319 - 1. Do the calculation in index_type, so that
5320 if it is a variable the computations will be
5321 done in the proper mode. */
5322 itype
= fold_build2_loc (loc
, MINUS_EXPR
, index_type
,
5323 convert (index_type
, size
),
5324 convert (index_type
,
5327 /* If that overflowed, the array is too big. ???
5328 While a size of INT_MAX+1 technically shouldn't
5329 cause an overflow (because we subtract 1), the
5330 overflow is recorded during the conversion to
5331 index_type, before the subtraction. Handling
5332 this case seems like an unnecessary
5334 if (TREE_CODE (itype
) == INTEGER_CST
5335 && TREE_OVERFLOW (itype
))
5338 error_at (loc
, "size of array %qE is too large",
5341 error_at (loc
, "size of unnamed array is too large");
5342 type
= error_mark_node
;
5346 itype
= build_index_type (itype
);
5348 if (this_size_varies
)
5351 *expr
= build2 (COMPOUND_EXPR
, TREE_TYPE (size
),
5355 *expr_const_operands
&= size_maybe_const
;
5358 else if (decl_context
== FIELD
)
5360 bool flexible_array_member
= false;
5361 if (array_parm_vla_unspec_p
)
5362 /* Field names can in fact have function prototype
5363 scope so [*] is disallowed here through making
5364 the field variably modified, not through being
5365 something other than a declaration with function
5370 const struct c_declarator
*t
= declarator
;
5371 while (t
->kind
== cdk_attrs
)
5373 flexible_array_member
= (t
->kind
== cdk_id
);
5375 if (flexible_array_member
5376 && pedantic
&& !flag_isoc99
&& !in_system_header
)
5377 pedwarn (loc
, OPT_pedantic
,
5378 "ISO C90 does not support flexible array members");
5380 /* ISO C99 Flexible array members are effectively
5381 identical to GCC's zero-length array extension. */
5382 if (flexible_array_member
|| array_parm_vla_unspec_p
)
5383 itype
= build_range_type (sizetype
, size_zero_node
,
5386 else if (decl_context
== PARM
)
5388 if (array_parm_vla_unspec_p
)
5390 itype
= build_range_type (sizetype
, size_zero_node
, NULL_TREE
);
5394 else if (decl_context
== TYPENAME
)
5396 if (array_parm_vla_unspec_p
)
5399 warning (0, "%<[*]%> not in a declaration");
5400 /* We use this to avoid messing up with incomplete
5401 array types of the same type, that would
5402 otherwise be modified below. */
5403 itype
= build_range_type (sizetype
, size_zero_node
,
5409 /* Complain about arrays of incomplete types. */
5410 if (!COMPLETE_TYPE_P (type
))
5412 error_at (loc
, "array type has incomplete element type");
5413 type
= error_mark_node
;
5416 /* When itype is NULL, a shared incomplete array type is
5417 returned for all array of a given type. Elsewhere we
5418 make sure we don't complete that type before copying
5419 it, but here we want to make sure we don't ever
5420 modify the shared type, so we gcc_assert (itype)
5423 addr_space_t as
= DECODE_QUAL_ADDR_SPACE (type_quals
);
5424 if (!ADDR_SPACE_GENERIC_P (as
) && as
!= TYPE_ADDR_SPACE (type
))
5425 type
= build_qualified_type (type
,
5426 ENCODE_QUAL_ADDR_SPACE (as
));
5428 type
= build_array_type (type
, itype
);
5431 if (type
!= error_mark_node
)
5435 /* It is ok to modify type here even if itype is
5436 NULL: if size_varies, we're in a
5437 multi-dimensional array and the inner type has
5438 variable size, so the enclosing shared array type
5440 if (size
&& TREE_CODE (size
) == INTEGER_CST
)
5442 = build_distinct_type_copy (TYPE_MAIN_VARIANT (type
));
5443 C_TYPE_VARIABLE_SIZE (type
) = 1;
5446 /* The GCC extension for zero-length arrays differs from
5447 ISO flexible array members in that sizeof yields
5449 if (size
&& integer_zerop (size
))
5452 type
= build_distinct_type_copy (TYPE_MAIN_VARIANT (type
));
5453 TYPE_SIZE (type
) = bitsize_zero_node
;
5454 TYPE_SIZE_UNIT (type
) = size_zero_node
;
5455 SET_TYPE_STRUCTURAL_EQUALITY (type
);
5457 if (array_parm_vla_unspec_p
)
5460 /* The type is complete. C99 6.7.5.2p4 */
5461 type
= build_distinct_type_copy (TYPE_MAIN_VARIANT (type
));
5462 TYPE_SIZE (type
) = bitsize_zero_node
;
5463 TYPE_SIZE_UNIT (type
) = size_zero_node
;
5464 SET_TYPE_STRUCTURAL_EQUALITY (type
);
5468 if (decl_context
!= PARM
5469 && (array_ptr_quals
!= TYPE_UNQUALIFIED
5470 || array_ptr_attrs
!= NULL_TREE
5471 || array_parm_static
))
5473 error_at (loc
, "static or type qualifiers in non-parameter array declarator");
5474 array_ptr_quals
= TYPE_UNQUALIFIED
;
5475 array_ptr_attrs
= NULL_TREE
;
5476 array_parm_static
= 0;
5482 /* Say it's a definition only for the declarator closest
5483 to the identifier, apart possibly from some
5485 bool really_funcdef
= false;
5489 const struct c_declarator
*t
= declarator
->declarator
;
5490 while (t
->kind
== cdk_attrs
)
5492 really_funcdef
= (t
->kind
== cdk_id
);
5495 /* Declaring a function type. Make sure we have a valid
5496 type for the function to return. */
5497 if (type
== error_mark_node
)
5500 size_varies
= false;
5502 /* Warn about some types functions can't return. */
5503 if (TREE_CODE (type
) == FUNCTION_TYPE
)
5506 error_at (loc
, "%qE declared as function returning a "
5509 error_at (loc
, "type name declared as function "
5510 "returning a function");
5511 type
= integer_type_node
;
5513 if (TREE_CODE (type
) == ARRAY_TYPE
)
5516 error_at (loc
, "%qE declared as function returning an array",
5519 error_at (loc
, "type name declared as function returning "
5521 type
= integer_type_node
;
5523 errmsg
= targetm
.invalid_return_type (type
);
5527 type
= integer_type_node
;
5530 /* Construct the function type and go to the next
5531 inner layer of declarator. */
5532 arg_info
= declarator
->u
.arg_info
;
5533 arg_types
= grokparms (arg_info
, really_funcdef
);
5535 put_pending_sizes (arg_info
->pending_sizes
);
5537 /* Type qualifiers before the return type of the function
5538 qualify the return type, not the function type. */
5541 /* Type qualifiers on a function return type are
5542 normally permitted by the standard but have no
5543 effect, so give a warning at -Wreturn-type.
5544 Qualifiers on a void return type are banned on
5545 function definitions in ISO C; GCC used to used
5546 them for noreturn functions. */
5547 if (VOID_TYPE_P (type
) && really_funcdef
)
5549 "function definition has qualified void return type");
5551 warning_at (loc
, OPT_Wignored_qualifiers
,
5552 "type qualifiers ignored on function return type");
5554 type
= c_build_qualified_type (type
, type_quals
);
5556 type_quals
= TYPE_UNQUALIFIED
;
5558 type
= build_function_type (type
, arg_types
);
5559 declarator
= declarator
->declarator
;
5561 /* Set the TYPE_CONTEXTs for each tagged type which is local to
5562 the formal parameter list of this FUNCTION_TYPE to point to
5563 the FUNCTION_TYPE node itself. */
5568 FOR_EACH_VEC_ELT_REVERSE (c_arg_tag
, arg_info
->tags
, ix
, tag
)
5569 TYPE_CONTEXT (tag
->type
) = type
;
5575 /* Merge any constancy or volatility into the target type
5578 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
5580 pedwarn (loc
, OPT_pedantic
,
5581 "ISO C forbids qualified function types");
5583 type
= c_build_qualified_type (type
, type_quals
);
5584 size_varies
= false;
5586 /* When the pointed-to type involves components of variable size,
5587 care must be taken to ensure that the size evaluation code is
5588 emitted early enough to dominate all the possible later uses
5589 and late enough for the variables on which it depends to have
5592 This is expected to happen automatically when the pointed-to
5593 type has a name/declaration of it's own, but special attention
5594 is required if the type is anonymous.
5596 We handle the NORMAL and FIELD contexts here by attaching an
5597 artificial TYPE_DECL to such pointed-to type. This forces the
5598 sizes evaluation at a safe point and ensures it is not deferred
5599 until e.g. within a deeper conditional context.
5601 We expect nothing to be needed here for PARM or TYPENAME.
5602 Pushing a TYPE_DECL at this point for TYPENAME would actually
5603 be incorrect, as we might be in the middle of an expression
5604 with side effects on the pointed-to type size "arguments" prior
5605 to the pointer declaration point and the fake TYPE_DECL in the
5606 enclosing context would force the size evaluation prior to the
5609 if (!TYPE_NAME (type
)
5610 && (decl_context
== NORMAL
|| decl_context
== FIELD
)
5611 && variably_modified_type_p (type
, NULL_TREE
))
5613 tree decl
= build_decl (loc
, TYPE_DECL
, NULL_TREE
, type
);
5614 DECL_ARTIFICIAL (decl
) = 1;
5616 finish_decl (decl
, loc
, NULL_TREE
, NULL_TREE
, NULL_TREE
);
5617 TYPE_NAME (type
) = decl
;
5620 type
= build_pointer_type (type
);
5622 /* Process type qualifiers (such as const or volatile)
5623 that were given inside the `*'. */
5624 type_quals
= declarator
->u
.pointer_quals
;
5626 declarator
= declarator
->declarator
;
5633 *decl_attrs
= chainon (returned_attrs
, *decl_attrs
);
5635 /* Now TYPE has the actual type, apart from any qualifiers in
5638 /* Warn about address space used for things other than static memory or
5640 address_space
= DECODE_QUAL_ADDR_SPACE (type_quals
);
5641 if (!ADDR_SPACE_GENERIC_P (address_space
))
5643 if (decl_context
== NORMAL
)
5645 switch (storage_class
)
5648 error ("%qs combined with %<auto%> qualifier for %qE",
5649 c_addr_space_name (address_space
), name
);
5652 error ("%qs combined with %<register%> qualifier for %qE",
5653 c_addr_space_name (address_space
), name
);
5656 if (current_function_scope
)
5658 error ("%qs specified for auto variable %qE",
5659 c_addr_space_name (address_space
), name
);
5671 else if (decl_context
== PARM
&& TREE_CODE (type
) != ARRAY_TYPE
)
5674 error ("%qs specified for parameter %qE",
5675 c_addr_space_name (address_space
), name
);
5677 error ("%qs specified for unnamed parameter",
5678 c_addr_space_name (address_space
));
5680 else if (decl_context
== FIELD
)
5683 error ("%qs specified for structure field %qE",
5684 c_addr_space_name (address_space
), name
);
5686 error ("%qs specified for structure field",
5687 c_addr_space_name (address_space
));
5691 /* Check the type and width of a bit-field. */
5693 check_bitfield_type_and_width (&type
, width
, name
);
5695 /* Did array size calculations overflow? */
5697 if (TREE_CODE (type
) == ARRAY_TYPE
5698 && COMPLETE_TYPE_P (type
)
5699 && TREE_CODE (TYPE_SIZE_UNIT (type
)) == INTEGER_CST
5700 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type
)))
5703 error_at (loc
, "size of array %qE is too large", name
);
5705 error_at (loc
, "size of unnamed array is too large");
5706 /* If we proceed with the array type as it is, we'll eventually
5707 crash in tree_low_cst(). */
5708 type
= error_mark_node
;
5711 /* If this is declaring a typedef name, return a TYPE_DECL. */
5713 if (storage_class
== csc_typedef
)
5716 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
5718 pedwarn (loc
, OPT_pedantic
,
5719 "ISO C forbids qualified function types");
5721 type
= c_build_qualified_type (type
, type_quals
);
5722 decl
= build_decl (declarator
->id_loc
,
5723 TYPE_DECL
, declarator
->u
.id
, type
);
5724 if (declspecs
->explicit_signed_p
)
5725 C_TYPEDEF_EXPLICITLY_SIGNED (decl
) = 1;
5726 if (declspecs
->inline_p
)
5727 pedwarn (loc
, 0,"typedef %q+D declared %<inline%>", decl
);
5729 if (warn_cxx_compat
&& declarator
->u
.id
!= NULL_TREE
)
5731 struct c_binding
*b
= I_TAG_BINDING (declarator
->u
.id
);
5734 && b
->decl
!= NULL_TREE
5735 && (B_IN_CURRENT_SCOPE (b
)
5736 || (current_scope
== file_scope
&& B_IN_EXTERNAL_SCOPE (b
)))
5737 && TYPE_MAIN_VARIANT (b
->decl
) != TYPE_MAIN_VARIANT (type
))
5739 warning_at (declarator
->id_loc
, OPT_Wc___compat
,
5740 ("using %qD as both a typedef and a tag is "
5743 if (b
->locus
!= UNKNOWN_LOCATION
)
5744 inform (b
->locus
, "originally defined here");
5751 /* If this is a type name (such as, in a cast or sizeof),
5752 compute the type and return it now. */
5754 if (decl_context
== TYPENAME
)
5756 /* Note that the grammar rejects storage classes in typenames
5758 gcc_assert (storage_class
== csc_none
&& !threadp
5759 && !declspecs
->inline_p
);
5760 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
5762 pedwarn (loc
, OPT_pedantic
,
5763 "ISO C forbids const or volatile function types");
5765 type
= c_build_qualified_type (type
, type_quals
);
5769 if (pedantic
&& decl_context
== FIELD
5770 && variably_modified_type_p (type
, NULL_TREE
))
5773 pedwarn (loc
, OPT_pedantic
, "a member of a structure or union cannot "
5774 "have a variably modified type");
5777 /* Aside from typedefs and type names (handle above),
5778 `void' at top level (not within pointer)
5779 is allowed only in public variables.
5780 We don't complain about parms either, but that is because
5781 a better error message can be made later. */
5783 if (VOID_TYPE_P (type
) && decl_context
!= PARM
5784 && !((decl_context
!= FIELD
&& TREE_CODE (type
) != FUNCTION_TYPE
)
5785 && (storage_class
== csc_extern
5786 || (current_scope
== file_scope
5787 && !(storage_class
== csc_static
5788 || storage_class
== csc_register
)))))
5790 error_at (loc
, "variable or field %qE declared void", name
);
5791 type
= integer_type_node
;
5794 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
5795 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
5800 if (decl_context
== PARM
)
5804 /* A parameter declared as an array of T is really a pointer to T.
5805 One declared as a function is really a pointer to a function. */
5807 if (TREE_CODE (type
) == ARRAY_TYPE
)
5809 /* Transfer const-ness of array into that of type pointed to. */
5810 type
= TREE_TYPE (type
);
5812 type
= c_build_qualified_type (type
, type_quals
);
5813 type
= build_pointer_type (type
);
5814 type_quals
= array_ptr_quals
;
5816 type
= c_build_qualified_type (type
, type_quals
);
5818 /* We don't yet implement attributes in this context. */
5819 if (array_ptr_attrs
!= NULL_TREE
)
5820 warning_at (loc
, OPT_Wattributes
,
5821 "attributes in parameter array declarator ignored");
5823 size_varies
= false;
5825 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
5828 pedwarn (loc
, OPT_pedantic
,
5829 "ISO C forbids qualified function types");
5831 type
= c_build_qualified_type (type
, type_quals
);
5832 type
= build_pointer_type (type
);
5833 type_quals
= TYPE_UNQUALIFIED
;
5835 else if (type_quals
)
5836 type
= c_build_qualified_type (type
, type_quals
);
5838 decl
= build_decl (declarator
->id_loc
,
5839 PARM_DECL
, declarator
->u
.id
, type
);
5841 C_DECL_VARIABLE_SIZE (decl
) = 1;
5843 /* Compute the type actually passed in the parmlist,
5844 for the case where there is no prototype.
5845 (For example, shorts and chars are passed as ints.)
5846 When there is a prototype, this is overridden later. */
5848 if (type
== error_mark_node
)
5849 promoted_type
= type
;
5851 promoted_type
= c_type_promotes_to (type
);
5853 DECL_ARG_TYPE (decl
) = promoted_type
;
5854 if (declspecs
->inline_p
)
5855 pedwarn (loc
, 0, "parameter %q+D declared %<inline%>", decl
);
5857 else if (decl_context
== FIELD
)
5859 /* Note that the grammar rejects storage classes in typenames
5861 gcc_assert (storage_class
== csc_none
&& !threadp
5862 && !declspecs
->inline_p
);
5864 /* Structure field. It may not be a function. */
5866 if (TREE_CODE (type
) == FUNCTION_TYPE
)
5868 error_at (loc
, "field %qE declared as a function", name
);
5869 type
= build_pointer_type (type
);
5871 else if (TREE_CODE (type
) != ERROR_MARK
5872 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type
))
5875 error_at (loc
, "field %qE has incomplete type", name
);
5877 error_at (loc
, "unnamed field has incomplete type");
5878 type
= error_mark_node
;
5880 type
= c_build_qualified_type (type
, type_quals
);
5881 decl
= build_decl (declarator
->id_loc
,
5882 FIELD_DECL
, declarator
->u
.id
, type
);
5883 DECL_NONADDRESSABLE_P (decl
) = bitfield
;
5884 if (bitfield
&& !declarator
->u
.id
)
5885 TREE_NO_WARNING (decl
) = 1;
5888 C_DECL_VARIABLE_SIZE (decl
) = 1;
5890 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
5892 if (storage_class
== csc_register
|| threadp
)
5894 error_at (loc
, "invalid storage class for function %qE", name
);
5896 else if (current_scope
!= file_scope
)
5898 /* Function declaration not at file scope. Storage
5899 classes other than `extern' are not allowed, C99
5900 6.7.1p5, and `extern' makes no difference. However,
5901 GCC allows 'auto', perhaps with 'inline', to support
5902 nested functions. */
5903 if (storage_class
== csc_auto
)
5904 pedwarn (loc
, OPT_pedantic
,
5905 "invalid storage class for function %qE", name
);
5906 else if (storage_class
== csc_static
)
5908 error_at (loc
, "invalid storage class for function %qE", name
);
5910 storage_class
= declspecs
->storage_class
= csc_none
;
5916 decl
= build_decl (declarator
->id_loc
,
5917 FUNCTION_DECL
, declarator
->u
.id
, type
);
5918 decl
= build_decl_attribute_variant (decl
, decl_attr
);
5920 if (pedantic
&& type_quals
&& !DECL_IN_SYSTEM_HEADER (decl
))
5921 pedwarn (loc
, OPT_pedantic
,
5922 "ISO C forbids qualified function types");
5924 /* Every function declaration is an external reference
5925 (DECL_EXTERNAL) except for those which are not at file
5926 scope and are explicitly declared "auto". This is
5927 forbidden by standard C (C99 6.7.1p5) and is interpreted by
5928 GCC to signify a forward declaration of a nested function. */
5929 if (storage_class
== csc_auto
&& current_scope
!= file_scope
)
5930 DECL_EXTERNAL (decl
) = 0;
5931 /* In C99, a function which is declared 'inline' with 'extern'
5932 is not an external reference (which is confusing). It
5933 means that the later definition of the function must be output
5934 in this file, C99 6.7.4p6. In GNU C89, a function declared
5935 'extern inline' is an external reference. */
5936 else if (declspecs
->inline_p
&& storage_class
!= csc_static
)
5937 DECL_EXTERNAL (decl
) = ((storage_class
== csc_extern
)
5938 == flag_gnu89_inline
);
5940 DECL_EXTERNAL (decl
) = !initialized
;
5942 /* Record absence of global scope for `static' or `auto'. */
5944 = !(storage_class
== csc_static
|| storage_class
== csc_auto
);
5946 /* For a function definition, record the argument information
5947 block where store_parm_decls will look for it. */
5949 current_function_arg_info
= arg_info
;
5951 if (declspecs
->default_int_p
)
5952 C_FUNCTION_IMPLICIT_INT (decl
) = 1;
5954 /* Record presence of `inline', if it is reasonable. */
5955 if (flag_hosted
&& MAIN_NAME_P (declarator
->u
.id
))
5957 if (declspecs
->inline_p
)
5958 pedwarn (loc
, 0, "cannot inline function %<main%>");
5960 else if (declspecs
->inline_p
)
5961 /* Record that the function is declared `inline'. */
5962 DECL_DECLARED_INLINE_P (decl
) = 1;
5966 /* It's a variable. */
5967 /* An uninitialized decl with `extern' is a reference. */
5968 int extern_ref
= !initialized
&& storage_class
== csc_extern
;
5970 type
= c_build_qualified_type (type
, type_quals
);
5972 /* C99 6.2.2p7: It is invalid (compile-time undefined
5973 behavior) to create an 'extern' declaration for a
5974 variable if there is a global declaration that is
5975 'static' and the global declaration is not visible.
5976 (If the static declaration _is_ currently visible,
5977 the 'extern' declaration is taken to refer to that decl.) */
5978 if (extern_ref
&& current_scope
!= file_scope
)
5980 tree global_decl
= identifier_global_value (declarator
->u
.id
);
5981 tree visible_decl
= lookup_name (declarator
->u
.id
);
5984 && global_decl
!= visible_decl
5985 && TREE_CODE (global_decl
) == VAR_DECL
5986 && !TREE_PUBLIC (global_decl
))
5987 error_at (loc
, "variable previously declared %<static%> "
5988 "redeclared %<extern%>");
5991 decl
= build_decl (declarator
->id_loc
,
5992 VAR_DECL
, declarator
->u
.id
, type
);
5994 C_DECL_VARIABLE_SIZE (decl
) = 1;
5996 if (declspecs
->inline_p
)
5997 pedwarn (loc
, 0, "variable %q+D declared %<inline%>", decl
);
5999 /* At file scope, an initialized extern declaration may follow
6000 a static declaration. In that case, DECL_EXTERNAL will be
6001 reset later in start_decl. */
6002 DECL_EXTERNAL (decl
) = (storage_class
== csc_extern
);
6004 /* At file scope, the presence of a `static' or `register' storage
6005 class specifier, or the absence of all storage class specifiers
6006 makes this declaration a definition (perhaps tentative). Also,
6007 the absence of `static' makes it public. */
6008 if (current_scope
== file_scope
)
6010 TREE_PUBLIC (decl
) = storage_class
!= csc_static
;
6011 TREE_STATIC (decl
) = !extern_ref
;
6013 /* Not at file scope, only `static' makes a static definition. */
6016 TREE_STATIC (decl
) = (storage_class
== csc_static
);
6017 TREE_PUBLIC (decl
) = extern_ref
;
6021 DECL_TLS_MODEL (decl
) = decl_default_tls_model (decl
);
6024 if ((storage_class
== csc_extern
6025 || (storage_class
== csc_none
6026 && TREE_CODE (type
) == FUNCTION_TYPE
6028 && variably_modified_type_p (type
, NULL_TREE
))
6031 if (TREE_CODE (type
) == FUNCTION_TYPE
)
6032 error_at (loc
, "non-nested function with variably modified type");
6034 error_at (loc
, "object with variably modified type must have "
6038 /* Record `register' declaration for warnings on &
6039 and in case doing stupid register allocation. */
6041 if (storage_class
== csc_register
)
6043 C_DECL_REGISTER (decl
) = 1;
6044 DECL_REGISTER (decl
) = 1;
6047 /* Record constancy and volatility. */
6048 c_apply_type_quals_to_decl (type_quals
, decl
);
6050 /* If a type has volatile components, it should be stored in memory.
6051 Otherwise, the fact that those components are volatile
6052 will be ignored, and would even crash the compiler.
6053 Of course, this only makes sense on VAR,PARM, and RESULT decl's. */
6054 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl
))
6055 && (TREE_CODE (decl
) == VAR_DECL
|| TREE_CODE (decl
) == PARM_DECL
6056 || TREE_CODE (decl
) == RESULT_DECL
))
6058 /* It is not an error for a structure with volatile fields to
6059 be declared register, but reset DECL_REGISTER since it
6060 cannot actually go in a register. */
6061 int was_reg
= C_DECL_REGISTER (decl
);
6062 C_DECL_REGISTER (decl
) = 0;
6063 DECL_REGISTER (decl
) = 0;
6064 c_mark_addressable (decl
);
6065 C_DECL_REGISTER (decl
) = was_reg
;
6068 /* This is the earliest point at which we might know the assembler
6069 name of a variable. Thus, if it's known before this, die horribly. */
6070 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl
));
6073 && TREE_CODE (decl
) == VAR_DECL
6074 && TREE_PUBLIC (decl
)
6075 && TREE_STATIC (decl
)
6076 && (TREE_CODE (TREE_TYPE (decl
)) == RECORD_TYPE
6077 || TREE_CODE (TREE_TYPE (decl
)) == UNION_TYPE
6078 || TREE_CODE (TREE_TYPE (decl
)) == ENUMERAL_TYPE
)
6079 && TYPE_NAME (TREE_TYPE (decl
)) == NULL_TREE
)
6080 warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wc___compat
,
6081 ("non-local variable %qD with anonymous type is "
6082 "questionable in C++"),
6089 /* Decode the parameter-list info for a function type or function definition.
6090 The argument is the value returned by `get_parm_info' (or made in c-parse.c
6091 if there is an identifier list instead of a parameter decl list).
6092 These two functions are separate because when a function returns
6093 or receives functions then each is called multiple times but the order
6094 of calls is different. The last call to `grokparms' is always the one
6095 that contains the formal parameter names of a function definition.
6097 Return a list of arg types to use in the FUNCTION_TYPE for this function.
6099 FUNCDEF_FLAG is true for a function definition, false for
6100 a mere declaration. A nonempty identifier-list gets an error message
6101 when FUNCDEF_FLAG is false. */
6104 grokparms (struct c_arg_info
*arg_info
, bool funcdef_flag
)
6106 tree arg_types
= arg_info
->types
;
6108 if (funcdef_flag
&& arg_info
->had_vla_unspec
)
6110 /* A function definition isn't function prototype scope C99 6.2.1p4. */
6112 error ("%<[*]%> not allowed in other than function prototype scope");
6115 if (arg_types
== 0 && !funcdef_flag
&& !in_system_header
)
6116 warning (OPT_Wstrict_prototypes
,
6117 "function declaration isn%'t a prototype");
6119 if (arg_types
== error_mark_node
)
6120 return 0; /* don't set TYPE_ARG_TYPES in this case */
6122 else if (arg_types
&& TREE_CODE (TREE_VALUE (arg_types
)) == IDENTIFIER_NODE
)
6125 pedwarn (input_location
, 0, "parameter names (without types) in function declaration");
6127 arg_info
->parms
= arg_info
->types
;
6128 arg_info
->types
= 0;
6133 tree parm
, type
, typelt
;
6134 unsigned int parmno
;
6137 /* If there is a parameter of incomplete type in a definition,
6138 this is an error. In a declaration this is valid, and a
6139 struct or union type may be completed later, before any calls
6140 or definition of the function. In the case where the tag was
6141 first declared within the parameter list, a warning has
6142 already been given. If a parameter has void type, then
6143 however the function cannot be defined or called, so
6146 for (parm
= arg_info
->parms
, typelt
= arg_types
, parmno
= 1;
6148 parm
= DECL_CHAIN (parm
), typelt
= TREE_CHAIN (typelt
), parmno
++)
6150 type
= TREE_VALUE (typelt
);
6151 if (type
== error_mark_node
)
6154 if (!COMPLETE_TYPE_P (type
))
6158 if (DECL_NAME (parm
))
6159 error_at (input_location
,
6160 "parameter %u (%q+D) has incomplete type",
6163 error_at (DECL_SOURCE_LOCATION (parm
),
6164 "parameter %u has incomplete type",
6167 TREE_VALUE (typelt
) = error_mark_node
;
6168 TREE_TYPE (parm
) = error_mark_node
;
6169 arg_types
= NULL_TREE
;
6171 else if (VOID_TYPE_P (type
))
6173 if (DECL_NAME (parm
))
6174 warning_at (input_location
, 0,
6175 "parameter %u (%q+D) has void type",
6178 warning_at (DECL_SOURCE_LOCATION (parm
), 0,
6179 "parameter %u has void type",
6184 errmsg
= targetm
.invalid_parameter_type (type
);
6188 TREE_VALUE (typelt
) = error_mark_node
;
6189 TREE_TYPE (parm
) = error_mark_node
;
6190 arg_types
= NULL_TREE
;
6193 if (DECL_NAME (parm
) && TREE_USED (parm
))
6194 warn_if_shadowing (parm
);
6200 /* Allocate and initialize a c_arg_info structure from the parser's
6204 build_arg_info (void)
6206 struct c_arg_info
*ret
= XOBNEW (&parser_obstack
, struct c_arg_info
);
6207 ret
->parms
= NULL_TREE
;
6209 ret
->types
= NULL_TREE
;
6210 ret
->others
= NULL_TREE
;
6211 ret
->pending_sizes
= NULL
;
6212 ret
->had_vla_unspec
= 0;
6216 /* Take apart the current scope and return a c_arg_info structure with
6217 info on a parameter list just parsed.
6219 This structure is later fed to 'grokparms' and 'store_parm_decls'.
6221 ELLIPSIS being true means the argument list ended in '...' so don't
6222 append a sentinel (void_list_node) to the end of the type-list. */
6225 get_parm_info (bool ellipsis
)
6227 struct c_binding
*b
= current_scope
->bindings
;
6228 struct c_arg_info
*arg_info
= build_arg_info ();
6231 VEC(c_arg_tag
,gc
) *tags
= NULL
;
6235 static bool explained_incomplete_types
= false;
6236 bool gave_void_only_once_err
= false;
6238 arg_info
->had_vla_unspec
= current_scope
->had_vla_unspec
;
6240 /* The bindings in this scope must not get put into a block.
6241 We will take care of deleting the binding nodes. */
6242 current_scope
->bindings
= 0;
6244 /* This function is only called if there was *something* on the
6248 /* A parameter list consisting solely of 'void' indicates that the
6249 function takes no arguments. But if the 'void' is qualified
6250 (by 'const' or 'volatile'), or has a storage class specifier
6251 ('register'), then the behavior is undefined; issue an error.
6252 Typedefs for 'void' are OK (see DR#157). */
6253 if (b
->prev
== 0 /* one binding */
6254 && TREE_CODE (b
->decl
) == PARM_DECL
/* which is a parameter */
6255 && !DECL_NAME (b
->decl
) /* anonymous */
6256 && VOID_TYPE_P (TREE_TYPE (b
->decl
))) /* of void type */
6258 if (TREE_THIS_VOLATILE (b
->decl
)
6259 || TREE_READONLY (b
->decl
)
6260 || C_DECL_REGISTER (b
->decl
))
6261 error ("%<void%> as only parameter may not be qualified");
6263 /* There cannot be an ellipsis. */
6265 error ("%<void%> must be the only parameter");
6267 arg_info
->types
= void_list_node
;
6272 types
= void_list_node
;
6274 /* Break up the bindings list into parms, tags, types, and others;
6275 apply sanity checks; purge the name-to-decl bindings. */
6278 tree decl
= b
->decl
;
6279 tree type
= TREE_TYPE (decl
);
6281 const char *keyword
;
6283 switch (TREE_CODE (decl
))
6288 gcc_assert (I_SYMBOL_BINDING (b
->id
) == b
);
6289 I_SYMBOL_BINDING (b
->id
) = b
->shadowed
;
6292 /* Check for forward decls that never got their actual decl. */
6293 if (TREE_ASM_WRITTEN (decl
))
6294 error ("parameter %q+D has just a forward declaration", decl
);
6295 /* Check for (..., void, ...) and issue an error. */
6296 else if (VOID_TYPE_P (type
) && !DECL_NAME (decl
))
6298 if (!gave_void_only_once_err
)
6300 error ("%<void%> must be the only parameter");
6301 gave_void_only_once_err
= true;
6306 /* Valid parameter, add it to the list. */
6307 DECL_CHAIN (decl
) = parms
;
6310 /* Since there is a prototype, args are passed in their
6311 declared types. The back end may override this later. */
6312 DECL_ARG_TYPE (decl
) = type
;
6313 types
= tree_cons (0, type
, types
);
6317 case ENUMERAL_TYPE
: keyword
= "enum"; goto tag
;
6318 case UNION_TYPE
: keyword
= "union"; goto tag
;
6319 case RECORD_TYPE
: keyword
= "struct"; goto tag
;
6321 /* Types may not have tag-names, in which case the type
6322 appears in the bindings list with b->id NULL. */
6325 gcc_assert (I_TAG_BINDING (b
->id
) == b
);
6326 I_TAG_BINDING (b
->id
) = b
->shadowed
;
6329 /* Warn about any struct, union or enum tags defined in a
6330 parameter list. The scope of such types is limited to
6331 the parameter list, which is rarely if ever desirable
6332 (it's impossible to call such a function with type-
6333 correct arguments). An anonymous union parm type is
6334 meaningful as a GNU extension, so don't warn for that. */
6335 if (TREE_CODE (decl
) != UNION_TYPE
|| b
->id
!= 0)
6338 /* The %s will be one of 'struct', 'union', or 'enum'. */
6339 warning (0, "%<%s %E%> declared inside parameter list",
6342 /* The %s will be one of 'struct', 'union', or 'enum'. */
6343 warning (0, "anonymous %s declared inside parameter list",
6346 if (!explained_incomplete_types
)
6348 warning (0, "its scope is only this definition or declaration,"
6349 " which is probably not what you want");
6350 explained_incomplete_types
= true;
6354 tag
= VEC_safe_push (c_arg_tag
, gc
, tags
, NULL
);
6362 /* CONST_DECLs appear here when we have an embedded enum,
6363 and TYPE_DECLs appear here when we have an embedded struct
6364 or union. No warnings for this - we already warned about the
6365 type itself. FUNCTION_DECLs appear when there is an implicit
6366 function declaration in the parameter list. */
6368 /* When we reinsert this decl in the function body, we need
6369 to reconstruct whether it was marked as nested. */
6370 gcc_assert (TREE_CODE (decl
) == FUNCTION_DECL
6373 DECL_CHAIN (decl
) = others
;
6378 /* error_mark_node appears here when we have an undeclared
6379 variable. Just throw it away. */
6382 gcc_assert (I_SYMBOL_BINDING (b
->id
) == b
);
6383 I_SYMBOL_BINDING (b
->id
) = b
->shadowed
;
6387 /* Other things that might be encountered. */
6394 b
= free_binding_and_advance (b
);
6397 arg_info
->parms
= parms
;
6398 arg_info
->tags
= tags
;
6399 arg_info
->types
= types
;
6400 arg_info
->others
= others
;
6401 arg_info
->pending_sizes
= get_pending_sizes ();
6405 /* Get the struct, enum or union (CODE says which) with tag NAME.
6406 Define the tag as a forward-reference with location LOC if it is
6407 not defined. Return a c_typespec structure for the type
6411 parser_xref_tag (location_t loc
, enum tree_code code
, tree name
)
6413 struct c_typespec ret
;
6417 ret
.expr
= NULL_TREE
;
6418 ret
.expr_const_operands
= true;
6420 /* If a cross reference is requested, look up the type
6421 already defined for this tag and return it. */
6423 ref
= lookup_tag (code
, name
, 0, &refloc
);
6424 /* If this is the right type of tag, return what we found.
6425 (This reference will be shadowed by shadow_tag later if appropriate.)
6426 If this is the wrong type of tag, do not return it. If it was the
6427 wrong type in the same scope, we will have had an error
6428 message already; if in a different scope and declaring
6429 a name, pending_xref_error will give an error message; but if in a
6430 different scope and not declaring a name, this tag should
6431 shadow the previous declaration of a different type of tag, and
6432 this would not work properly if we return the reference found.
6433 (For example, with "struct foo" in an outer scope, "union foo;"
6434 must shadow that tag with a new one of union type.) */
6435 ret
.kind
= (ref
? ctsk_tagref
: ctsk_tagfirstref
);
6436 if (ref
&& TREE_CODE (ref
) == code
)
6438 if (C_TYPE_DEFINED_IN_STRUCT (ref
)
6439 && loc
!= UNKNOWN_LOCATION
6445 warning_at (loc
, OPT_Wc___compat
,
6446 ("enum type defined in struct or union "
6447 "is not visible in C++"));
6448 inform (refloc
, "enum type defined here");
6451 warning_at (loc
, OPT_Wc___compat
,
6452 ("struct defined in struct or union "
6453 "is not visible in C++"));
6454 inform (refloc
, "struct defined here");
6457 warning_at (loc
, OPT_Wc___compat
,
6458 ("union defined in struct or union "
6459 "is not visible in C++"));
6460 inform (refloc
, "union defined here");
6471 /* If no such tag is yet defined, create a forward-reference node
6472 and record it as the "definition".
6473 When a real declaration of this type is found,
6474 the forward-reference will be altered into a real type. */
6476 ref
= make_node (code
);
6477 if (code
== ENUMERAL_TYPE
)
6479 /* Give the type a default layout like unsigned int
6480 to avoid crashing if it does not get defined. */
6481 SET_TYPE_MODE (ref
, TYPE_MODE (unsigned_type_node
));
6482 TYPE_ALIGN (ref
) = TYPE_ALIGN (unsigned_type_node
);
6483 TYPE_USER_ALIGN (ref
) = 0;
6484 TYPE_UNSIGNED (ref
) = 1;
6485 TYPE_PRECISION (ref
) = TYPE_PRECISION (unsigned_type_node
);
6486 TYPE_MIN_VALUE (ref
) = TYPE_MIN_VALUE (unsigned_type_node
);
6487 TYPE_MAX_VALUE (ref
) = TYPE_MAX_VALUE (unsigned_type_node
);
6490 pushtag (loc
, name
, ref
);
6496 /* Get the struct, enum or union (CODE says which) with tag NAME.
6497 Define the tag as a forward-reference if it is not defined.
6498 Return a tree for the type. */
6501 xref_tag (enum tree_code code
, tree name
)
6503 return parser_xref_tag (input_location
, code
, name
).spec
;
6506 /* Make sure that the tag NAME is defined *in the current scope*
6507 at least as a forward reference.
6508 LOC is the location of the struct's definition.
6509 CODE says which kind of tag NAME ought to be.
6511 This stores the current value of the file static STRUCT_PARSE_INFO
6512 in *ENCLOSING_STRUCT_PARSE_INFO, and points STRUCT_PARSE_INFO at a
6513 new c_struct_parse_info structure. The old value of
6514 STRUCT_PARSE_INFO is restored in finish_struct. */
6517 start_struct (location_t loc
, enum tree_code code
, tree name
,
6518 struct c_struct_parse_info
**enclosing_struct_parse_info
)
6520 /* If there is already a tag defined at this scope
6521 (as a forward reference), just return it. */
6523 tree ref
= NULL_TREE
;
6524 location_t refloc
= UNKNOWN_LOCATION
;
6526 if (name
!= NULL_TREE
)
6527 ref
= lookup_tag (code
, name
, 1, &refloc
);
6528 if (ref
&& TREE_CODE (ref
) == code
)
6530 if (TYPE_SIZE (ref
))
6532 if (code
== UNION_TYPE
)
6533 error_at (loc
, "redefinition of %<union %E%>", name
);
6535 error_at (loc
, "redefinition of %<struct %E%>", name
);
6536 if (refloc
!= UNKNOWN_LOCATION
)
6537 inform (refloc
, "originally defined here");
6538 /* Don't create structures using a name already in use. */
6541 else if (C_TYPE_BEING_DEFINED (ref
))
6543 if (code
== UNION_TYPE
)
6544 error_at (loc
, "nested redefinition of %<union %E%>", name
);
6546 error_at (loc
, "nested redefinition of %<struct %E%>", name
);
6547 /* Don't bother to report "originally defined here" for a
6548 nested redefinition; the original definition should be
6550 /* Don't create structures that contain themselves. */
6555 /* Otherwise create a forward-reference just so the tag is in scope. */
6557 if (ref
== NULL_TREE
|| TREE_CODE (ref
) != code
)
6559 ref
= make_node (code
);
6560 pushtag (loc
, name
, ref
);
6563 C_TYPE_BEING_DEFINED (ref
) = 1;
6564 TYPE_PACKED (ref
) = flag_pack_struct
;
6566 *enclosing_struct_parse_info
= struct_parse_info
;
6567 struct_parse_info
= XNEW (struct c_struct_parse_info
);
6568 struct_parse_info
->struct_types
= VEC_alloc (tree
, heap
, 0);
6569 struct_parse_info
->fields
= VEC_alloc (c_binding_ptr
, heap
, 0);
6570 struct_parse_info
->typedefs_seen
= VEC_alloc (tree
, heap
, 0);
6572 /* FIXME: This will issue a warning for a use of a type defined
6573 within a statement expr used within sizeof, et. al. This is not
6574 terribly serious as C++ doesn't permit statement exprs within
6576 if (warn_cxx_compat
&& (in_sizeof
|| in_typeof
|| in_alignof
))
6577 warning_at (loc
, OPT_Wc___compat
,
6578 "defining type in %qs expression is invalid in C++",
6581 : (in_typeof
? "typeof" : "alignof")));
6586 /* Process the specs, declarator and width (NULL if omitted)
6587 of a structure component, returning a FIELD_DECL node.
6588 WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node.
6589 DECL_ATTRS is as for grokdeclarator.
6591 LOC is the location of the structure component.
6593 This is done during the parsing of the struct declaration.
6594 The FIELD_DECL nodes are chained together and the lot of them
6595 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
6598 grokfield (location_t loc
,
6599 struct c_declarator
*declarator
, struct c_declspecs
*declspecs
,
6600 tree width
, tree
*decl_attrs
)
6604 if (declarator
->kind
== cdk_id
&& declarator
->u
.id
== NULL_TREE
6605 && width
== NULL_TREE
)
6607 /* This is an unnamed decl.
6609 If we have something of the form "union { list } ;" then this
6610 is the anonymous union extension. Similarly for struct.
6612 If this is something of the form "struct foo;", then
6613 If MS extensions are enabled, this is handled as an
6615 Otherwise this is a forward declaration of a structure tag.
6617 If this is something of the form "foo;" and foo is a TYPE_DECL, then
6618 If foo names a structure or union without a tag, then this
6619 is an anonymous struct (this is permitted by C1X).
6620 If MS extensions are enabled and foo names a structure, then
6621 again this is an anonymous struct.
6622 Otherwise this is an error.
6624 Oh what a horrid tangled web we weave. I wonder if MS consciously
6625 took this from Plan 9 or if it was an accident of implementation
6626 that took root before someone noticed the bug... */
6628 tree type
= declspecs
->type
;
6629 bool type_ok
= (TREE_CODE (type
) == RECORD_TYPE
6630 || TREE_CODE (type
) == UNION_TYPE
);
6635 if (flag_ms_extensions
)
6637 else if (TYPE_NAME (TYPE_MAIN_VARIANT (type
)) == NULL
)
6644 pedwarn (loc
, 0, "declaration does not declare anything");
6650 pedwarn (loc
, OPT_pedantic
,
6651 "ISO C99 doesn%'t support unnamed structs/unions");
6653 pedwarn (loc
, OPT_pedantic
,
6654 "ISO C90 doesn%'t support unnamed structs/unions");
6658 value
= grokdeclarator (declarator
, declspecs
, FIELD
, false,
6659 width
? &width
: NULL
, decl_attrs
, NULL
, NULL
,
6662 finish_decl (value
, loc
, NULL_TREE
, NULL_TREE
, NULL_TREE
);
6663 DECL_INITIAL (value
) = width
;
6665 if (warn_cxx_compat
&& DECL_NAME (value
) != NULL_TREE
)
6667 /* If we currently have a binding for this field, set the
6668 in_struct field in the binding, so that we warn about lookups
6670 struct c_binding
*b
= I_SYMBOL_BINDING (DECL_NAME (value
));
6673 /* If the in_struct field is not yet set, push it on a list
6674 to be cleared when this struct is finished. */
6677 VEC_safe_push (c_binding_ptr
, heap
,
6678 struct_parse_info
->fields
, b
);
6687 /* Subroutine of detect_field_duplicates: add the fields of FIELDLIST
6688 to HTAB, giving errors for any duplicates. */
6691 detect_field_duplicates_hash (tree fieldlist
, htab_t htab
)
6696 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
6697 if ((y
= DECL_NAME (x
)) != 0)
6699 slot
= htab_find_slot (htab
, y
, INSERT
);
6702 error ("duplicate member %q+D", x
);
6703 DECL_NAME (x
) = NULL_TREE
;
6707 else if (TREE_CODE (TREE_TYPE (x
)) == RECORD_TYPE
6708 || TREE_CODE (TREE_TYPE (x
)) == UNION_TYPE
)
6709 detect_field_duplicates_hash (TYPE_FIELDS (TREE_TYPE (x
)), htab
);
6712 /* Generate an error for any duplicate field names in FIELDLIST. Munge
6713 the list such that this does not present a problem later. */
6716 detect_field_duplicates (tree fieldlist
)
6721 /* First, see if there are more than "a few" fields.
6722 This is trivially true if there are zero or one fields. */
6725 x
= DECL_CHAIN (fieldlist
);
6730 if (DECL_NAME (x
) == NULL_TREE
6731 && (TREE_CODE (TREE_TYPE (x
)) == RECORD_TYPE
6732 || TREE_CODE (TREE_TYPE (x
)) == UNION_TYPE
))
6735 } while (timeout
> 0 && x
);
6737 /* If there were "few" fields and no anonymous structures or unions,
6738 avoid the overhead of allocating a hash table. Instead just do
6739 the nested traversal thing. */
6742 for (x
= DECL_CHAIN (fieldlist
); x
; x
= DECL_CHAIN (x
))
6745 for (y
= fieldlist
; y
!= x
; y
= TREE_CHAIN (y
))
6746 if (DECL_NAME (y
) == DECL_NAME (x
))
6748 error ("duplicate member %q+D", x
);
6749 DECL_NAME (x
) = NULL_TREE
;
6755 htab_t htab
= htab_create (37, htab_hash_pointer
, htab_eq_pointer
, NULL
);
6757 detect_field_duplicates_hash (fieldlist
, htab
);
6762 /* Finish up struct info used by -Wc++-compat. */
6765 warn_cxx_compat_finish_struct (tree fieldlist
)
6769 struct c_binding
*b
;
6771 /* Set the C_TYPE_DEFINED_IN_STRUCT flag for each type defined in
6772 the current struct. We do this now at the end of the struct
6773 because the flag is used to issue visibility warnings, and we
6774 only want to issue those warnings if the type is referenced
6775 outside of the struct declaration. */
6776 FOR_EACH_VEC_ELT (tree
, struct_parse_info
->struct_types
, ix
, x
)
6777 C_TYPE_DEFINED_IN_STRUCT (x
) = 1;
6779 /* The TYPEDEFS_SEEN field of STRUCT_PARSE_INFO is a list of
6780 typedefs used when declaring fields in this struct. If the name
6781 of any of the fields is also a typedef name then the struct would
6782 not parse in C++, because the C++ lookup rules say that the
6783 typedef name would be looked up in the context of the struct, and
6784 would thus be the field rather than the typedef. */
6785 if (!VEC_empty (tree
, struct_parse_info
->typedefs_seen
)
6786 && fieldlist
!= NULL_TREE
)
6788 /* Use a pointer_set using the name of the typedef. We can use
6789 a pointer_set because identifiers are interned. */
6790 struct pointer_set_t
*tset
= pointer_set_create ();
6792 FOR_EACH_VEC_ELT (tree
, struct_parse_info
->typedefs_seen
, ix
, x
)
6793 pointer_set_insert (tset
, DECL_NAME (x
));
6795 for (x
= fieldlist
; x
!= NULL_TREE
; x
= DECL_CHAIN (x
))
6797 if (pointer_set_contains (tset
, DECL_NAME (x
)))
6799 warning_at (DECL_SOURCE_LOCATION (x
), OPT_Wc___compat
,
6800 ("using %qD as both field and typedef name is "
6803 /* FIXME: It would be nice to report the location where
6804 the typedef name is used. */
6808 pointer_set_destroy (tset
);
6811 /* For each field which has a binding and which was not defined in
6812 an enclosing struct, clear the in_struct field. */
6813 FOR_EACH_VEC_ELT (c_binding_ptr
, struct_parse_info
->fields
, ix
, b
)
6817 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
6818 LOC is the location of the RECORD_TYPE or UNION_TYPE's definition.
6819 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
6820 ATTRIBUTES are attributes to be applied to the structure.
6822 ENCLOSING_STRUCT_PARSE_INFO is the value of STRUCT_PARSE_INFO when
6823 the struct was started. */
6826 finish_struct (location_t loc
, tree t
, tree fieldlist
, tree attributes
,
6827 struct c_struct_parse_info
*enclosing_struct_parse_info
)
6830 bool toplevel
= file_scope
== current_scope
;
6831 int saw_named_field
;
6833 /* If this type was previously laid out as a forward reference,
6834 make sure we lay it out again. */
6838 decl_attributes (&t
, attributes
, (int) ATTR_FLAG_TYPE_IN_PLACE
);
6842 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
6844 if (DECL_NAME (x
) != 0)
6847 && (TREE_CODE (TREE_TYPE (x
)) == RECORD_TYPE
6848 || TREE_CODE (TREE_TYPE (x
)) == UNION_TYPE
))
6854 if (TREE_CODE (t
) == UNION_TYPE
)
6857 pedwarn (loc
, OPT_pedantic
, "union has no named members");
6859 pedwarn (loc
, OPT_pedantic
, "union has no members");
6864 pedwarn (loc
, OPT_pedantic
, "struct has no named members");
6866 pedwarn (loc
, OPT_pedantic
, "struct has no members");
6871 /* Install struct as DECL_CONTEXT of each field decl.
6872 Also process specified field sizes, found in the DECL_INITIAL,
6873 storing 0 there after the type has been changed to precision equal
6874 to its width, rather than the precision of the specified standard
6875 type. (Correct layout requires the original type to have been preserved
6878 saw_named_field
= 0;
6879 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
6881 if (TREE_TYPE (x
) == error_mark_node
)
6884 DECL_CONTEXT (x
) = t
;
6886 /* If any field is const, the structure type is pseudo-const. */
6887 if (TREE_READONLY (x
))
6888 C_TYPE_FIELDS_READONLY (t
) = 1;
6891 /* A field that is pseudo-const makes the structure likewise. */
6892 tree t1
= strip_array_types (TREE_TYPE (x
));
6893 if ((TREE_CODE (t1
) == RECORD_TYPE
|| TREE_CODE (t1
) == UNION_TYPE
)
6894 && C_TYPE_FIELDS_READONLY (t1
))
6895 C_TYPE_FIELDS_READONLY (t
) = 1;
6898 /* Any field that is volatile means variables of this type must be
6899 treated in some ways as volatile. */
6900 if (TREE_THIS_VOLATILE (x
))
6901 C_TYPE_FIELDS_VOLATILE (t
) = 1;
6903 /* Any field of nominal variable size implies structure is too. */
6904 if (C_DECL_VARIABLE_SIZE (x
))
6905 C_TYPE_VARIABLE_SIZE (t
) = 1;
6907 if (DECL_INITIAL (x
))
6909 unsigned HOST_WIDE_INT width
= tree_low_cst (DECL_INITIAL (x
), 1);
6910 DECL_SIZE (x
) = bitsize_int (width
);
6911 DECL_BIT_FIELD (x
) = 1;
6912 SET_DECL_C_BIT_FIELD (x
);
6916 && (DECL_BIT_FIELD (x
)
6917 || TYPE_ALIGN (TREE_TYPE (x
)) > BITS_PER_UNIT
))
6918 DECL_PACKED (x
) = 1;
6920 /* Detect flexible array member in an invalid context. */
6921 if (TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
6922 && TYPE_SIZE (TREE_TYPE (x
)) == NULL_TREE
6923 && TYPE_DOMAIN (TREE_TYPE (x
)) != NULL_TREE
6924 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x
))) == NULL_TREE
)
6926 if (TREE_CODE (t
) == UNION_TYPE
)
6928 error_at (DECL_SOURCE_LOCATION (x
),
6929 "flexible array member in union");
6930 TREE_TYPE (x
) = error_mark_node
;
6932 else if (DECL_CHAIN (x
) != NULL_TREE
)
6934 error_at (DECL_SOURCE_LOCATION (x
),
6935 "flexible array member not at end of struct");
6936 TREE_TYPE (x
) = error_mark_node
;
6938 else if (!saw_named_field
)
6940 error_at (DECL_SOURCE_LOCATION (x
),
6941 "flexible array member in otherwise empty struct");
6942 TREE_TYPE (x
) = error_mark_node
;
6946 if (pedantic
&& TREE_CODE (t
) == RECORD_TYPE
6947 && flexible_array_type_p (TREE_TYPE (x
)))
6948 pedwarn (DECL_SOURCE_LOCATION (x
), OPT_pedantic
,
6949 "invalid use of structure with flexible array member");
6952 || TREE_CODE (TREE_TYPE (x
)) == RECORD_TYPE
6953 || TREE_CODE (TREE_TYPE (x
)) == UNION_TYPE
)
6954 saw_named_field
= 1;
6957 detect_field_duplicates (fieldlist
);
6959 /* Now we have the nearly final fieldlist. Record it,
6960 then lay out the structure or union (including the fields). */
6962 TYPE_FIELDS (t
) = fieldlist
;
6966 /* Give bit-fields their proper types. */
6968 tree
*fieldlistp
= &fieldlist
;
6970 if (TREE_CODE (*fieldlistp
) == FIELD_DECL
&& DECL_INITIAL (*fieldlistp
)
6971 && TREE_TYPE (*fieldlistp
) != error_mark_node
)
6973 unsigned HOST_WIDE_INT width
6974 = tree_low_cst (DECL_INITIAL (*fieldlistp
), 1);
6975 tree type
= TREE_TYPE (*fieldlistp
);
6976 if (width
!= TYPE_PRECISION (type
))
6978 TREE_TYPE (*fieldlistp
)
6979 = c_build_bitfield_integer_type (width
, TYPE_UNSIGNED (type
));
6980 DECL_MODE (*fieldlistp
) = TYPE_MODE (TREE_TYPE (*fieldlistp
));
6982 DECL_INITIAL (*fieldlistp
) = 0;
6985 fieldlistp
= &DECL_CHAIN (*fieldlistp
);
6988 /* Now we have the truly final field list.
6989 Store it in this type and in the variants. */
6991 TYPE_FIELDS (t
) = fieldlist
;
6993 /* If there are lots of fields, sort so we can look through them fast.
6994 We arbitrarily consider 16 or more elts to be "a lot". */
6999 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
7001 if (len
> 15 || DECL_NAME (x
) == NULL
)
7009 struct lang_type
*space
;
7010 struct sorted_fields_type
*space2
;
7012 len
+= list_length (x
);
7014 /* Use the same allocation policy here that make_node uses, to
7015 ensure that this lives as long as the rest of the struct decl.
7016 All decls in an inline function need to be saved. */
7018 space
= ggc_alloc_cleared_lang_type (sizeof (struct lang_type
));
7019 space2
= ggc_alloc_sorted_fields_type
7020 (sizeof (struct sorted_fields_type
) + len
* sizeof (tree
));
7024 field_array
= &space2
->elts
[0];
7025 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
7027 field_array
[len
++] = x
;
7029 /* If there is anonymous struct or union, break out of the loop. */
7030 if (DECL_NAME (x
) == NULL
)
7033 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
7036 TYPE_LANG_SPECIFIC (t
) = space
;
7037 TYPE_LANG_SPECIFIC (t
)->s
->len
= len
;
7038 field_array
= TYPE_LANG_SPECIFIC (t
)->s
->elts
;
7039 qsort (field_array
, len
, sizeof (tree
), field_decl_cmp
);
7044 for (x
= TYPE_MAIN_VARIANT (t
); x
; x
= TYPE_NEXT_VARIANT (x
))
7046 TYPE_FIELDS (x
) = TYPE_FIELDS (t
);
7047 TYPE_LANG_SPECIFIC (x
) = TYPE_LANG_SPECIFIC (t
);
7048 C_TYPE_FIELDS_READONLY (x
) = C_TYPE_FIELDS_READONLY (t
);
7049 C_TYPE_FIELDS_VOLATILE (x
) = C_TYPE_FIELDS_VOLATILE (t
);
7050 C_TYPE_VARIABLE_SIZE (x
) = C_TYPE_VARIABLE_SIZE (t
);
7053 /* If this was supposed to be a transparent union, but we can't
7054 make it one, warn and turn off the flag. */
7055 if (TREE_CODE (t
) == UNION_TYPE
7056 && TYPE_TRANSPARENT_AGGR (t
)
7057 && (!TYPE_FIELDS (t
) || TYPE_MODE (t
) != DECL_MODE (TYPE_FIELDS (t
))))
7059 TYPE_TRANSPARENT_AGGR (t
) = 0;
7060 warning_at (loc
, 0, "union cannot be made transparent");
7063 /* If this structure or union completes the type of any previous
7064 variable declaration, lay it out and output its rtl. */
7065 for (x
= C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t
));
7069 tree decl
= TREE_VALUE (x
);
7070 if (TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
)
7071 layout_array_type (TREE_TYPE (decl
));
7072 if (TREE_CODE (decl
) != TYPE_DECL
)
7074 layout_decl (decl
, 0);
7075 if (c_dialect_objc ())
7076 objc_check_decl (decl
);
7077 rest_of_decl_compilation (decl
, toplevel
, 0);
7082 C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t
)) = 0;
7084 /* Update type location to the one of the definition, instead of e.g.
7085 a forward declaration. */
7086 if (TYPE_STUB_DECL (t
))
7087 DECL_SOURCE_LOCATION (TYPE_STUB_DECL (t
)) = loc
;
7089 /* Finish debugging output for this type. */
7090 rest_of_type_compilation (t
, toplevel
);
7092 /* If we're inside a function proper, i.e. not file-scope and not still
7093 parsing parameters, then arrange for the size of a variable sized type
7095 if (cur_stmt_list
&& variably_modified_type_p (t
, NULL_TREE
))
7096 add_stmt (build_stmt (loc
,
7097 DECL_EXPR
, build_decl (loc
, TYPE_DECL
, NULL
, t
)));
7099 if (warn_cxx_compat
)
7100 warn_cxx_compat_finish_struct (fieldlist
);
7102 VEC_free (tree
, heap
, struct_parse_info
->struct_types
);
7103 VEC_free (c_binding_ptr
, heap
, struct_parse_info
->fields
);
7104 VEC_free (tree
, heap
, struct_parse_info
->typedefs_seen
);
7105 XDELETE (struct_parse_info
);
7107 struct_parse_info
= enclosing_struct_parse_info
;
7109 /* If this struct is defined inside a struct, add it to
7112 && struct_parse_info
!= NULL
7113 && !in_sizeof
&& !in_typeof
&& !in_alignof
)
7114 VEC_safe_push (tree
, heap
, struct_parse_info
->struct_types
, t
);
7119 /* Lay out the type T, and its element type, and so on. */
7122 layout_array_type (tree t
)
7124 if (TREE_CODE (TREE_TYPE (t
)) == ARRAY_TYPE
)
7125 layout_array_type (TREE_TYPE (t
));
7129 /* Begin compiling the definition of an enumeration type.
7130 NAME is its name (or null if anonymous).
7131 LOC is the enum's location.
7132 Returns the type object, as yet incomplete.
7133 Also records info about it so that build_enumerator
7134 may be used to declare the individual values as they are read. */
7137 start_enum (location_t loc
, struct c_enum_contents
*the_enum
, tree name
)
7139 tree enumtype
= NULL_TREE
;
7140 location_t enumloc
= UNKNOWN_LOCATION
;
7142 /* If this is the real definition for a previous forward reference,
7143 fill in the contents in the same object that used to be the
7144 forward reference. */
7146 if (name
!= NULL_TREE
)
7147 enumtype
= lookup_tag (ENUMERAL_TYPE
, name
, 1, &enumloc
);
7149 if (enumtype
== 0 || TREE_CODE (enumtype
) != ENUMERAL_TYPE
)
7151 enumtype
= make_node (ENUMERAL_TYPE
);
7152 pushtag (loc
, name
, enumtype
);
7155 if (C_TYPE_BEING_DEFINED (enumtype
))
7156 error_at (loc
, "nested redefinition of %<enum %E%>", name
);
7158 C_TYPE_BEING_DEFINED (enumtype
) = 1;
7160 if (TYPE_VALUES (enumtype
) != 0)
7162 /* This enum is a named one that has been declared already. */
7163 error_at (loc
, "redeclaration of %<enum %E%>", name
);
7164 if (enumloc
!= UNKNOWN_LOCATION
)
7165 inform (enumloc
, "originally defined here");
7167 /* Completely replace its old definition.
7168 The old enumerators remain defined, however. */
7169 TYPE_VALUES (enumtype
) = 0;
7172 the_enum
->enum_next_value
= integer_zero_node
;
7173 the_enum
->enum_overflow
= 0;
7175 if (flag_short_enums
)
7176 TYPE_PACKED (enumtype
) = 1;
7178 /* FIXME: This will issue a warning for a use of a type defined
7179 within sizeof in a statement expr. This is not terribly serious
7180 as C++ doesn't permit statement exprs within sizeof anyhow. */
7181 if (warn_cxx_compat
&& (in_sizeof
|| in_typeof
|| in_alignof
))
7182 warning_at (loc
, OPT_Wc___compat
,
7183 "defining type in %qs expression is invalid in C++",
7186 : (in_typeof
? "typeof" : "alignof")));
7191 /* After processing and defining all the values of an enumeration type,
7192 install their decls in the enumeration type and finish it off.
7193 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
7194 and ATTRIBUTES are the specified attributes.
7195 Returns ENUMTYPE. */
7198 finish_enum (tree enumtype
, tree values
, tree attributes
)
7201 tree minnode
= 0, maxnode
= 0;
7202 int precision
, unsign
;
7203 bool toplevel
= (file_scope
== current_scope
);
7204 struct lang_type
*lt
;
7206 decl_attributes (&enumtype
, attributes
, (int) ATTR_FLAG_TYPE_IN_PLACE
);
7208 /* Calculate the maximum value of any enumerator in this type. */
7210 if (values
== error_mark_node
)
7211 minnode
= maxnode
= integer_zero_node
;
7214 minnode
= maxnode
= TREE_VALUE (values
);
7215 for (pair
= TREE_CHAIN (values
); pair
; pair
= TREE_CHAIN (pair
))
7217 tree value
= TREE_VALUE (pair
);
7218 if (tree_int_cst_lt (maxnode
, value
))
7220 if (tree_int_cst_lt (value
, minnode
))
7225 /* Construct the final type of this enumeration. It is the same
7226 as one of the integral types - the narrowest one that fits, except
7227 that normally we only go as narrow as int - and signed iff any of
7228 the values are negative. */
7229 unsign
= (tree_int_cst_sgn (minnode
) >= 0);
7230 precision
= MAX (tree_int_cst_min_precision (minnode
, unsign
),
7231 tree_int_cst_min_precision (maxnode
, unsign
));
7233 if (TYPE_PACKED (enumtype
) || precision
> TYPE_PRECISION (integer_type_node
))
7235 tem
= c_common_type_for_size (precision
, unsign
);
7238 warning (0, "enumeration values exceed range of largest integer");
7239 tem
= long_long_integer_type_node
;
7243 tem
= unsign
? unsigned_type_node
: integer_type_node
;
7245 TYPE_MIN_VALUE (enumtype
) = TYPE_MIN_VALUE (tem
);
7246 TYPE_MAX_VALUE (enumtype
) = TYPE_MAX_VALUE (tem
);
7247 TYPE_UNSIGNED (enumtype
) = TYPE_UNSIGNED (tem
);
7248 TYPE_SIZE (enumtype
) = 0;
7250 /* If the precision of the type was specific with an attribute and it
7251 was too small, give an error. Otherwise, use it. */
7252 if (TYPE_PRECISION (enumtype
))
7254 if (precision
> TYPE_PRECISION (enumtype
))
7255 error ("specified mode too small for enumeral values");
7258 TYPE_PRECISION (enumtype
) = TYPE_PRECISION (tem
);
7260 layout_type (enumtype
);
7262 if (values
!= error_mark_node
)
7264 /* Change the type of the enumerators to be the enum type. We
7265 need to do this irrespective of the size of the enum, for
7266 proper type checking. Replace the DECL_INITIALs of the
7267 enumerators, and the value slots of the list, with copies
7268 that have the enum type; they cannot be modified in place
7269 because they may be shared (e.g. integer_zero_node) Finally,
7270 change the purpose slots to point to the names of the decls. */
7271 for (pair
= values
; pair
; pair
= TREE_CHAIN (pair
))
7273 tree enu
= TREE_PURPOSE (pair
);
7274 tree ini
= DECL_INITIAL (enu
);
7276 TREE_TYPE (enu
) = enumtype
;
7278 /* The ISO C Standard mandates enumerators to have type int,
7279 even though the underlying type of an enum type is
7280 unspecified. However, GCC allows enumerators of any
7281 integer type as an extensions. build_enumerator()
7282 converts any enumerators that fit in an int to type int,
7283 to avoid promotions to unsigned types when comparing
7284 integers with enumerators that fit in the int range.
7285 When -pedantic is given, build_enumerator() would have
7286 already warned about those that don't fit. Here we
7287 convert the rest to the enumerator type. */
7288 if (TREE_TYPE (ini
) != integer_type_node
)
7289 ini
= convert (enumtype
, ini
);
7291 DECL_INITIAL (enu
) = ini
;
7292 TREE_PURPOSE (pair
) = DECL_NAME (enu
);
7293 TREE_VALUE (pair
) = ini
;
7296 TYPE_VALUES (enumtype
) = values
;
7299 /* Record the min/max values so that we can warn about bit-field
7300 enumerations that are too small for the values. */
7301 lt
= ggc_alloc_cleared_lang_type (sizeof (struct lang_type
));
7302 lt
->enum_min
= minnode
;
7303 lt
->enum_max
= maxnode
;
7304 TYPE_LANG_SPECIFIC (enumtype
) = lt
;
7306 /* Fix up all variant types of this enum type. */
7307 for (tem
= TYPE_MAIN_VARIANT (enumtype
); tem
; tem
= TYPE_NEXT_VARIANT (tem
))
7309 if (tem
== enumtype
)
7311 TYPE_VALUES (tem
) = TYPE_VALUES (enumtype
);
7312 TYPE_MIN_VALUE (tem
) = TYPE_MIN_VALUE (enumtype
);
7313 TYPE_MAX_VALUE (tem
) = TYPE_MAX_VALUE (enumtype
);
7314 TYPE_SIZE (tem
) = TYPE_SIZE (enumtype
);
7315 TYPE_SIZE_UNIT (tem
) = TYPE_SIZE_UNIT (enumtype
);
7316 SET_TYPE_MODE (tem
, TYPE_MODE (enumtype
));
7317 TYPE_PRECISION (tem
) = TYPE_PRECISION (enumtype
);
7318 TYPE_ALIGN (tem
) = TYPE_ALIGN (enumtype
);
7319 TYPE_USER_ALIGN (tem
) = TYPE_USER_ALIGN (enumtype
);
7320 TYPE_UNSIGNED (tem
) = TYPE_UNSIGNED (enumtype
);
7321 TYPE_LANG_SPECIFIC (tem
) = TYPE_LANG_SPECIFIC (enumtype
);
7324 /* Finish debugging output for this type. */
7325 rest_of_type_compilation (enumtype
, toplevel
);
7327 /* If this enum is defined inside a struct, add it to
7330 && struct_parse_info
!= NULL
7331 && !in_sizeof
&& !in_typeof
&& !in_alignof
)
7332 VEC_safe_push (tree
, heap
, struct_parse_info
->struct_types
, enumtype
);
7337 /* Build and install a CONST_DECL for one value of the
7338 current enumeration type (one that was begun with start_enum).
7339 DECL_LOC is the location of the enumerator.
7340 LOC is the location of the '=' operator if any, DECL_LOC otherwise.
7341 Return a tree-list containing the CONST_DECL and its value.
7342 Assignment of sequential values by default is handled here. */
7345 build_enumerator (location_t decl_loc
, location_t loc
,
7346 struct c_enum_contents
*the_enum
, tree name
, tree value
)
7350 /* Validate and default VALUE. */
7354 /* Don't issue more errors for error_mark_node (i.e. an
7355 undeclared identifier) - just ignore the value expression. */
7356 if (value
== error_mark_node
)
7358 else if (!INTEGRAL_TYPE_P (TREE_TYPE (value
)))
7360 error_at (loc
, "enumerator value for %qE is not an integer constant",
7366 if (TREE_CODE (value
) != INTEGER_CST
)
7368 value
= c_fully_fold (value
, false, NULL
);
7369 if (TREE_CODE (value
) == INTEGER_CST
)
7370 pedwarn (loc
, OPT_pedantic
,
7371 "enumerator value for %qE is not an integer "
7372 "constant expression", name
);
7374 if (TREE_CODE (value
) != INTEGER_CST
)
7376 error ("enumerator value for %qE is not an integer constant",
7382 value
= default_conversion (value
);
7383 constant_expression_warning (value
);
7388 /* Default based on previous value. */
7389 /* It should no longer be possible to have NON_LVALUE_EXPR
7393 value
= the_enum
->enum_next_value
;
7394 if (the_enum
->enum_overflow
)
7395 error_at (loc
, "overflow in enumeration values");
7397 /* Even though the underlying type of an enum is unspecified, the
7398 type of enumeration constants is explicitly defined as int
7399 (6.4.4.3/2 in the C99 Standard). GCC allows any integer type as
7401 else if (!int_fits_type_p (value
, integer_type_node
))
7402 pedwarn (loc
, OPT_pedantic
,
7403 "ISO C restricts enumerator values to range of %<int%>");
7405 /* The ISO C Standard mandates enumerators to have type int, even
7406 though the underlying type of an enum type is unspecified.
7407 However, GCC allows enumerators of any integer type as an
7408 extensions. Here we convert any enumerators that fit in an int
7409 to type int, to avoid promotions to unsigned types when comparing
7410 integers with enumerators that fit in the int range. When
7411 -pedantic is given, we would have already warned about those that
7412 don't fit. We have to do this here rather than in finish_enum
7413 because this value may be used to define more enumerators. */
7414 if (int_fits_type_p (value
, integer_type_node
))
7415 value
= convert (integer_type_node
, value
);
7417 /* Set basis for default for next value. */
7418 the_enum
->enum_next_value
7420 (EXPR_HAS_LOCATION (value
) ? EXPR_LOCATION (value
) : input_location
,
7421 PLUS_EXPR
, value
, integer_one_node
, 0);
7422 the_enum
->enum_overflow
= tree_int_cst_lt (the_enum
->enum_next_value
, value
);
7424 /* Now create a declaration for the enum value name. */
7426 type
= TREE_TYPE (value
);
7427 type
= c_common_type_for_size (MAX (TYPE_PRECISION (type
),
7428 TYPE_PRECISION (integer_type_node
)),
7429 (TYPE_PRECISION (type
)
7430 >= TYPE_PRECISION (integer_type_node
)
7431 && TYPE_UNSIGNED (type
)));
7433 decl
= build_decl (decl_loc
, CONST_DECL
, name
, type
);
7434 DECL_INITIAL (decl
) = convert (type
, value
);
7437 return tree_cons (decl
, value
, NULL_TREE
);
7441 /* Create the FUNCTION_DECL for a function definition.
7442 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
7443 the declaration; they describe the function's name and the type it returns,
7444 but twisted together in a fashion that parallels the syntax of C.
7446 This function creates a binding context for the function body
7447 as well as setting up the FUNCTION_DECL in current_function_decl.
7449 Returns 1 on success. If the DECLARATOR is not suitable for a function
7450 (it defines a datum instead), we return 0, which tells
7451 yyparse to report a parse error. */
7454 start_function (struct c_declspecs
*declspecs
, struct c_declarator
*declarator
,
7457 tree decl1
, old_decl
;
7458 tree restype
, resdecl
;
7461 current_function_returns_value
= 0; /* Assume, until we see it does. */
7462 current_function_returns_null
= 0;
7463 current_function_returns_abnormally
= 0;
7464 warn_about_return_type
= 0;
7465 c_switch_stack
= NULL
;
7467 /* Indicate no valid break/continue context by setting these variables
7468 to some non-null, non-label value. We'll notice and emit the proper
7469 error message in c_finish_bc_stmt. */
7470 c_break_label
= c_cont_label
= size_zero_node
;
7472 decl1
= grokdeclarator (declarator
, declspecs
, FUNCDEF
, true, NULL
,
7473 &attributes
, NULL
, NULL
, DEPRECATED_NORMAL
);
7475 /* If the declarator is not suitable for a function definition,
7476 cause a syntax error. */
7480 loc
= DECL_SOURCE_LOCATION (decl1
);
7482 decl_attributes (&decl1
, attributes
, 0);
7484 if (DECL_DECLARED_INLINE_P (decl1
)
7485 && DECL_UNINLINABLE (decl1
)
7486 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1
)))
7487 warning_at (loc
, OPT_Wattributes
,
7488 "inline function %qD given attribute noinline",
7491 /* Handle gnu_inline attribute. */
7492 if (declspecs
->inline_p
7493 && !flag_gnu89_inline
7494 && TREE_CODE (decl1
) == FUNCTION_DECL
7495 && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl1
))
7496 || current_function_decl
))
7498 if (declspecs
->storage_class
!= csc_static
)
7499 DECL_EXTERNAL (decl1
) = !DECL_EXTERNAL (decl1
);
7502 announce_function (decl1
);
7504 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1
))))
7506 error_at (loc
, "return type is an incomplete type");
7507 /* Make it return void instead. */
7509 = build_function_type (void_type_node
,
7510 TYPE_ARG_TYPES (TREE_TYPE (decl1
)));
7513 if (warn_about_return_type
)
7514 pedwarn_c99 (loc
, flag_isoc99
? 0
7515 : (warn_return_type
? OPT_Wreturn_type
: OPT_Wimplicit_int
),
7516 "return type defaults to %<int%>");
7518 /* Make the init_value nonzero so pushdecl knows this is not tentative.
7519 error_mark_node is replaced below (in pop_scope) with the BLOCK. */
7520 DECL_INITIAL (decl1
) = error_mark_node
;
7522 /* A nested function is not global. */
7523 if (current_function_decl
!= 0)
7524 TREE_PUBLIC (decl1
) = 0;
7526 /* If this definition isn't a prototype and we had a prototype declaration
7527 before, copy the arg type info from that prototype. */
7528 old_decl
= lookup_name_in_scope (DECL_NAME (decl1
), current_scope
);
7529 if (old_decl
&& TREE_CODE (old_decl
) != FUNCTION_DECL
)
7531 current_function_prototype_locus
= UNKNOWN_LOCATION
;
7532 current_function_prototype_built_in
= false;
7533 current_function_prototype_arg_types
= NULL_TREE
;
7534 if (TYPE_ARG_TYPES (TREE_TYPE (decl1
)) == 0)
7536 if (old_decl
!= 0 && TREE_CODE (TREE_TYPE (old_decl
)) == FUNCTION_TYPE
7537 && comptypes (TREE_TYPE (TREE_TYPE (decl1
)),
7538 TREE_TYPE (TREE_TYPE (old_decl
))))
7540 TREE_TYPE (decl1
) = composite_type (TREE_TYPE (old_decl
),
7542 current_function_prototype_locus
= DECL_SOURCE_LOCATION (old_decl
);
7543 current_function_prototype_built_in
7544 = C_DECL_BUILTIN_PROTOTYPE (old_decl
);
7545 current_function_prototype_arg_types
7546 = TYPE_ARG_TYPES (TREE_TYPE (decl1
));
7548 if (TREE_PUBLIC (decl1
))
7550 /* If there is an external prototype declaration of this
7551 function, record its location but do not copy information
7552 to this decl. This may be an invisible declaration
7553 (built-in or in a scope which has finished) or simply
7554 have more refined argument types than any declaration
7556 struct c_binding
*b
;
7557 for (b
= I_SYMBOL_BINDING (DECL_NAME (decl1
)); b
; b
= b
->shadowed
)
7558 if (B_IN_SCOPE (b
, external_scope
))
7562 tree ext_decl
, ext_type
;
7564 ext_type
= b
->u
.type
? b
->u
.type
: TREE_TYPE (ext_decl
);
7565 if (TREE_CODE (ext_type
) == FUNCTION_TYPE
7566 && comptypes (TREE_TYPE (TREE_TYPE (decl1
)),
7567 TREE_TYPE (ext_type
)))
7569 current_function_prototype_locus
7570 = DECL_SOURCE_LOCATION (ext_decl
);
7571 current_function_prototype_built_in
7572 = C_DECL_BUILTIN_PROTOTYPE (ext_decl
);
7573 current_function_prototype_arg_types
7574 = TYPE_ARG_TYPES (ext_type
);
7580 /* Optionally warn of old-fashioned def with no previous prototype. */
7581 if (warn_strict_prototypes
7582 && old_decl
!= error_mark_node
7583 && TYPE_ARG_TYPES (TREE_TYPE (decl1
)) == 0
7584 && C_DECL_ISNT_PROTOTYPE (old_decl
))
7585 warning_at (loc
, OPT_Wstrict_prototypes
,
7586 "function declaration isn%'t a prototype");
7587 /* Optionally warn of any global def with no previous prototype. */
7588 else if (warn_missing_prototypes
7589 && old_decl
!= error_mark_node
7590 && TREE_PUBLIC (decl1
)
7591 && !MAIN_NAME_P (DECL_NAME (decl1
))
7592 && C_DECL_ISNT_PROTOTYPE (old_decl
))
7593 warning_at (loc
, OPT_Wmissing_prototypes
,
7594 "no previous prototype for %qD", decl1
);
7595 /* Optionally warn of any def with no previous prototype
7596 if the function has already been used. */
7597 else if (warn_missing_prototypes
7599 && old_decl
!= error_mark_node
7600 && TREE_USED (old_decl
)
7601 && TYPE_ARG_TYPES (TREE_TYPE (old_decl
)) == 0)
7602 warning_at (loc
, OPT_Wmissing_prototypes
,
7603 "%qD was used with no prototype before its definition", decl1
);
7604 /* Optionally warn of any global def with no previous declaration. */
7605 else if (warn_missing_declarations
7606 && TREE_PUBLIC (decl1
)
7608 && !MAIN_NAME_P (DECL_NAME (decl1
)))
7609 warning_at (loc
, OPT_Wmissing_declarations
,
7610 "no previous declaration for %qD",
7612 /* Optionally warn of any def with no previous declaration
7613 if the function has already been used. */
7614 else if (warn_missing_declarations
7616 && old_decl
!= error_mark_node
7617 && TREE_USED (old_decl
)
7618 && C_DECL_IMPLICIT (old_decl
))
7619 warning_at (loc
, OPT_Wmissing_declarations
,
7620 "%qD was used with no declaration before its definition", decl1
);
7622 /* This function exists in static storage.
7623 (This does not mean `static' in the C sense!) */
7624 TREE_STATIC (decl1
) = 1;
7626 /* This is the earliest point at which we might know the assembler
7627 name of the function. Thus, if it's set before this, die horribly. */
7628 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl1
));
7630 /* If #pragma weak was used, mark the decl weak now. */
7631 if (current_scope
== file_scope
)
7632 maybe_apply_pragma_weak (decl1
);
7634 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
7635 if (warn_main
&& MAIN_NAME_P (DECL_NAME (decl1
)))
7637 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1
)))
7638 != integer_type_node
)
7639 pedwarn (loc
, OPT_Wmain
, "return type of %qD is not %<int%>", decl1
);
7641 check_main_parameter_types (decl1
);
7643 if (!TREE_PUBLIC (decl1
))
7644 pedwarn (loc
, OPT_Wmain
,
7645 "%qD is normally a non-static function", decl1
);
7648 /* Record the decl so that the function name is defined.
7649 If we already have a decl for this name, and it is a FUNCTION_DECL,
7650 use the old decl. */
7652 current_function_decl
= pushdecl (decl1
);
7655 declare_parm_level ();
7657 restype
= TREE_TYPE (TREE_TYPE (current_function_decl
));
7658 resdecl
= build_decl (loc
, RESULT_DECL
, NULL_TREE
, restype
);
7659 DECL_ARTIFICIAL (resdecl
) = 1;
7660 DECL_IGNORED_P (resdecl
) = 1;
7661 DECL_RESULT (current_function_decl
) = resdecl
;
7663 start_fname_decls ();
7668 /* Subroutine of store_parm_decls which handles new-style function
7669 definitions (prototype format). The parms already have decls, so we
7670 need only record them as in effect and complain if any redundant
7671 old-style parm decls were written. */
7673 store_parm_decls_newstyle (tree fndecl
, const struct c_arg_info
*arg_info
)
7679 if (current_scope
->bindings
)
7681 error_at (DECL_SOURCE_LOCATION (fndecl
),
7682 "old-style parameter declarations in prototyped "
7683 "function definition");
7685 /* Get rid of the old-style declarations. */
7689 /* Don't issue this warning for nested functions, and don't issue this
7690 warning if we got here because ARG_INFO_TYPES was error_mark_node
7691 (this happens when a function definition has just an ellipsis in
7692 its parameter list). */
7693 else if (!in_system_header
&& !current_function_scope
7694 && arg_info
->types
!= error_mark_node
)
7695 warning_at (DECL_SOURCE_LOCATION (fndecl
), OPT_Wtraditional
,
7696 "traditional C rejects ISO C style function definitions");
7698 /* Now make all the parameter declarations visible in the function body.
7699 We can bypass most of the grunt work of pushdecl. */
7700 for (decl
= arg_info
->parms
; decl
; decl
= DECL_CHAIN (decl
))
7702 DECL_CONTEXT (decl
) = current_function_decl
;
7703 if (DECL_NAME (decl
))
7705 bind (DECL_NAME (decl
), decl
, current_scope
,
7706 /*invisible=*/false, /*nested=*/false,
7708 if (!TREE_USED (decl
))
7709 warn_if_shadowing (decl
);
7712 error_at (DECL_SOURCE_LOCATION (decl
), "parameter name omitted");
7715 /* Record the parameter list in the function declaration. */
7716 DECL_ARGUMENTS (fndecl
) = arg_info
->parms
;
7718 /* Now make all the ancillary declarations visible, likewise. */
7719 for (decl
= arg_info
->others
; decl
; decl
= DECL_CHAIN (decl
))
7721 DECL_CONTEXT (decl
) = current_function_decl
;
7722 if (DECL_NAME (decl
))
7723 bind (DECL_NAME (decl
), decl
, current_scope
,
7724 /*invisible=*/false,
7725 /*nested=*/(TREE_CODE (decl
) == FUNCTION_DECL
),
7729 /* And all the tag declarations. */
7730 FOR_EACH_VEC_ELT_REVERSE (c_arg_tag
, arg_info
->tags
, ix
, tag
)
7732 bind (tag
->id
, tag
->type
, current_scope
,
7733 /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION
);
7736 /* Subroutine of store_parm_decls which handles old-style function
7737 definitions (separate parameter list and declarations). */
7740 store_parm_decls_oldstyle (tree fndecl
, const struct c_arg_info
*arg_info
)
7742 struct c_binding
*b
;
7743 tree parm
, decl
, last
;
7744 tree parmids
= arg_info
->parms
;
7745 struct pointer_set_t
*seen_args
= pointer_set_create ();
7747 if (!in_system_header
)
7748 warning_at (DECL_SOURCE_LOCATION (fndecl
),
7749 OPT_Wold_style_definition
, "old-style function definition");
7751 /* Match each formal parameter name with its declaration. Save each
7752 decl in the appropriate TREE_PURPOSE slot of the parmids chain. */
7753 for (parm
= parmids
; parm
; parm
= TREE_CHAIN (parm
))
7755 if (TREE_VALUE (parm
) == 0)
7757 error_at (DECL_SOURCE_LOCATION (fndecl
),
7758 "parameter name missing from parameter list");
7759 TREE_PURPOSE (parm
) = 0;
7763 b
= I_SYMBOL_BINDING (TREE_VALUE (parm
));
7764 if (b
&& B_IN_CURRENT_SCOPE (b
))
7767 /* If we got something other than a PARM_DECL it is an error. */
7768 if (TREE_CODE (decl
) != PARM_DECL
)
7769 error_at (DECL_SOURCE_LOCATION (decl
),
7770 "%qD declared as a non-parameter", decl
);
7771 /* If the declaration is already marked, we have a duplicate
7772 name. Complain and ignore the duplicate. */
7773 else if (pointer_set_contains (seen_args
, decl
))
7775 error_at (DECL_SOURCE_LOCATION (decl
),
7776 "multiple parameters named %qD", decl
);
7777 TREE_PURPOSE (parm
) = 0;
7780 /* If the declaration says "void", complain and turn it into
7782 else if (VOID_TYPE_P (TREE_TYPE (decl
)))
7784 error_at (DECL_SOURCE_LOCATION (decl
),
7785 "parameter %qD declared with void type", decl
);
7786 TREE_TYPE (decl
) = integer_type_node
;
7787 DECL_ARG_TYPE (decl
) = integer_type_node
;
7788 layout_decl (decl
, 0);
7790 warn_if_shadowing (decl
);
7792 /* If no declaration found, default to int. */
7795 /* FIXME diagnostics: This should be the location of the argument,
7796 not the FNDECL. E.g., for an old-style declaration
7798 int f10(v) { blah; }
7800 We should use the location of the V, not the F10.
7801 Unfortunately, the V is an IDENTIFIER_NODE which has no
7802 location. In the future we need locations for c_arg_info
7805 See gcc.dg/Wshadow-3.c for an example of this problem. */
7806 decl
= build_decl (DECL_SOURCE_LOCATION (fndecl
),
7807 PARM_DECL
, TREE_VALUE (parm
), integer_type_node
);
7808 DECL_ARG_TYPE (decl
) = TREE_TYPE (decl
);
7810 warn_if_shadowing (decl
);
7813 pedwarn (DECL_SOURCE_LOCATION (decl
),
7814 0, "type of %qD defaults to %<int%>", decl
);
7816 warning_at (DECL_SOURCE_LOCATION (decl
),
7817 OPT_Wmissing_parameter_type
,
7818 "type of %qD defaults to %<int%>", decl
);
7821 TREE_PURPOSE (parm
) = decl
;
7822 pointer_set_insert (seen_args
, decl
);
7825 /* Now examine the parms chain for incomplete declarations
7826 and declarations with no corresponding names. */
7828 for (b
= current_scope
->bindings
; b
; b
= b
->prev
)
7831 if (TREE_CODE (parm
) != PARM_DECL
)
7834 if (TREE_TYPE (parm
) != error_mark_node
7835 && !COMPLETE_TYPE_P (TREE_TYPE (parm
)))
7837 error_at (DECL_SOURCE_LOCATION (parm
),
7838 "parameter %qD has incomplete type", parm
);
7839 TREE_TYPE (parm
) = error_mark_node
;
7842 if (!pointer_set_contains (seen_args
, parm
))
7844 error_at (DECL_SOURCE_LOCATION (parm
),
7845 "declaration for parameter %qD but no such parameter",
7848 /* Pretend the parameter was not missing.
7849 This gets us to a standard state and minimizes
7850 further error messages. */
7851 parmids
= chainon (parmids
, tree_cons (parm
, 0, 0));
7855 /* Chain the declarations together in the order of the list of
7856 names. Store that chain in the function decl, replacing the
7857 list of names. Update the current scope to match. */
7858 DECL_ARGUMENTS (fndecl
) = 0;
7860 for (parm
= parmids
; parm
; parm
= TREE_CHAIN (parm
))
7861 if (TREE_PURPOSE (parm
))
7863 if (parm
&& TREE_PURPOSE (parm
))
7865 last
= TREE_PURPOSE (parm
);
7866 DECL_ARGUMENTS (fndecl
) = last
;
7868 for (parm
= TREE_CHAIN (parm
); parm
; parm
= TREE_CHAIN (parm
))
7869 if (TREE_PURPOSE (parm
))
7871 DECL_CHAIN (last
) = TREE_PURPOSE (parm
);
7872 last
= TREE_PURPOSE (parm
);
7874 DECL_CHAIN (last
) = 0;
7877 pointer_set_destroy (seen_args
);
7879 /* If there was a previous prototype,
7880 set the DECL_ARG_TYPE of each argument according to
7881 the type previously specified, and report any mismatches. */
7883 if (current_function_prototype_arg_types
)
7886 for (parm
= DECL_ARGUMENTS (fndecl
),
7887 type
= current_function_prototype_arg_types
;
7888 parm
|| (type
&& TREE_VALUE (type
) != error_mark_node
7889 && (TYPE_MAIN_VARIANT (TREE_VALUE (type
)) != void_type_node
));
7890 parm
= DECL_CHAIN (parm
), type
= TREE_CHAIN (type
))
7892 if (parm
== 0 || type
== 0
7893 || TYPE_MAIN_VARIANT (TREE_VALUE (type
)) == void_type_node
)
7895 if (current_function_prototype_built_in
)
7896 warning_at (DECL_SOURCE_LOCATION (fndecl
),
7897 0, "number of arguments doesn%'t match "
7898 "built-in prototype");
7901 /* FIXME diagnostics: This should be the location of
7902 FNDECL, but there is bug when a prototype is
7903 declared inside function context, but defined
7904 outside of it (e.g., gcc.dg/pr15698-2.c). In
7905 which case FNDECL gets the location of the
7906 prototype, not the definition. */
7907 error_at (input_location
,
7908 "number of arguments doesn%'t match prototype");
7910 error_at (current_function_prototype_locus
,
7911 "prototype declaration");
7915 /* Type for passing arg must be consistent with that
7916 declared for the arg. ISO C says we take the unqualified
7917 type for parameters declared with qualified type. */
7918 if (TREE_TYPE (parm
) != error_mark_node
7919 && TREE_TYPE (type
) != error_mark_node
7920 && !comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm
)),
7921 TYPE_MAIN_VARIANT (TREE_VALUE (type
))))
7923 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm
))
7924 == TYPE_MAIN_VARIANT (TREE_VALUE (type
)))
7926 /* Adjust argument to match prototype. E.g. a previous
7927 `int foo(float);' prototype causes
7928 `int foo(x) float x; {...}' to be treated like
7929 `int foo(float x) {...}'. This is particularly
7930 useful for argument types like uid_t. */
7931 DECL_ARG_TYPE (parm
) = TREE_TYPE (parm
);
7933 if (targetm
.calls
.promote_prototypes (TREE_TYPE (current_function_decl
))
7934 && INTEGRAL_TYPE_P (TREE_TYPE (parm
))
7935 && TYPE_PRECISION (TREE_TYPE (parm
))
7936 < TYPE_PRECISION (integer_type_node
))
7937 DECL_ARG_TYPE (parm
) = integer_type_node
;
7939 /* ??? Is it possible to get here with a
7940 built-in prototype or will it always have
7941 been diagnosed as conflicting with an
7942 old-style definition and discarded? */
7943 if (current_function_prototype_built_in
)
7944 warning_at (DECL_SOURCE_LOCATION (parm
),
7945 OPT_pedantic
, "promoted argument %qD "
7946 "doesn%'t match built-in prototype", parm
);
7949 pedwarn (DECL_SOURCE_LOCATION (parm
),
7950 OPT_pedantic
, "promoted argument %qD "
7951 "doesn%'t match prototype", parm
);
7952 pedwarn (current_function_prototype_locus
, OPT_pedantic
,
7953 "prototype declaration");
7958 if (current_function_prototype_built_in
)
7959 warning_at (DECL_SOURCE_LOCATION (parm
),
7960 0, "argument %qD doesn%'t match "
7961 "built-in prototype", parm
);
7964 error_at (DECL_SOURCE_LOCATION (parm
),
7965 "argument %qD doesn%'t match prototype", parm
);
7966 error_at (current_function_prototype_locus
,
7967 "prototype declaration");
7972 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl
)) = 0;
7975 /* Otherwise, create a prototype that would match. */
7979 tree actual
= 0, last
= 0, type
;
7981 for (parm
= DECL_ARGUMENTS (fndecl
); parm
; parm
= DECL_CHAIN (parm
))
7983 type
= tree_cons (NULL_TREE
, DECL_ARG_TYPE (parm
), NULL_TREE
);
7985 TREE_CHAIN (last
) = type
;
7990 type
= tree_cons (NULL_TREE
, void_type_node
, NULL_TREE
);
7992 TREE_CHAIN (last
) = type
;
7996 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
7997 of the type of this function, but we need to avoid having this
7998 affect the types of other similarly-typed functions, so we must
7999 first force the generation of an identical (but separate) type
8000 node for the relevant function type. The new node we create
8001 will be a variant of the main variant of the original function
8004 TREE_TYPE (fndecl
) = build_variant_type_copy (TREE_TYPE (fndecl
));
8006 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl
)) = actual
;
8010 /* Store parameter declarations passed in ARG_INFO into the current
8011 function declaration. */
8014 store_parm_decls_from (struct c_arg_info
*arg_info
)
8016 current_function_arg_info
= arg_info
;
8017 store_parm_decls ();
8020 /* Store the parameter declarations into the current function declaration.
8021 This is called after parsing the parameter declarations, before
8022 digesting the body of the function.
8024 For an old-style definition, construct a prototype out of the old-style
8025 parameter declarations and inject it into the function's type. */
8028 store_parm_decls (void)
8030 tree fndecl
= current_function_decl
;
8033 /* The argument information block for FNDECL. */
8034 struct c_arg_info
*arg_info
= current_function_arg_info
;
8035 current_function_arg_info
= 0;
8037 /* True if this definition is written with a prototype. Note:
8038 despite C99 6.7.5.3p14, we can *not* treat an empty argument
8039 list in a function definition as equivalent to (void) -- an
8040 empty argument list specifies the function has no parameters,
8041 but only (void) sets up a prototype for future calls. */
8042 proto
= arg_info
->types
!= 0;
8045 store_parm_decls_newstyle (fndecl
, arg_info
);
8047 store_parm_decls_oldstyle (fndecl
, arg_info
);
8049 /* The next call to push_scope will be a function body. */
8051 next_is_function_body
= true;
8053 /* Write a record describing this function definition to the prototypes
8054 file (if requested). */
8056 gen_aux_info_record (fndecl
, 1, 0, proto
);
8058 /* Initialize the RTL code for the function. */
8059 allocate_struct_function (fndecl
, false);
8061 /* Begin the statement tree for this function. */
8062 DECL_SAVED_TREE (fndecl
) = push_stmt_list ();
8064 /* ??? Insert the contents of the pending sizes list into the function
8065 to be evaluated. The only reason left to have this is
8066 void foo(int n, int array[n++])
8067 because we throw away the array type in favor of a pointer type, and
8068 thus won't naturally see the SAVE_EXPR containing the increment. All
8069 other pending sizes would be handled by gimplify_parameters. */
8071 VEC(tree
,gc
) *pending_sizes
= get_pending_sizes ();
8075 FOR_EACH_VEC_ELT (tree
, pending_sizes
, i
, t
)
8079 /* Even though we're inside a function body, we still don't want to
8080 call expand_expr to calculate the size of a variable-sized array.
8081 We haven't necessarily assigned RTL to all variables yet, so it's
8082 not safe to try to expand expressions involving them. */
8083 cfun
->dont_save_pending_sizes_p
= 1;
8087 /* Finish up a function declaration and compile that function
8088 all the way to assembler language output. Then free the storage
8089 for the function definition.
8091 This is called after parsing the body of the function definition. */
8094 finish_function (void)
8096 tree fndecl
= current_function_decl
;
8098 if (TREE_CODE (fndecl
) == FUNCTION_DECL
8099 && targetm
.calls
.promote_prototypes (TREE_TYPE (fndecl
)))
8101 tree args
= DECL_ARGUMENTS (fndecl
);
8102 for (; args
; args
= DECL_CHAIN (args
))
8104 tree type
= TREE_TYPE (args
);
8105 if (INTEGRAL_TYPE_P (type
)
8106 && TYPE_PRECISION (type
) < TYPE_PRECISION (integer_type_node
))
8107 DECL_ARG_TYPE (args
) = integer_type_node
;
8111 if (DECL_INITIAL (fndecl
) && DECL_INITIAL (fndecl
) != error_mark_node
)
8112 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl
)) = fndecl
;
8114 /* Must mark the RESULT_DECL as being in this function. */
8116 if (DECL_RESULT (fndecl
) && DECL_RESULT (fndecl
) != error_mark_node
)
8117 DECL_CONTEXT (DECL_RESULT (fndecl
)) = fndecl
;
8119 if (MAIN_NAME_P (DECL_NAME (fndecl
)) && flag_hosted
8120 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl
)))
8121 == integer_type_node
&& flag_isoc99
)
8123 /* Hack. We don't want the middle-end to warn that this return
8124 is unreachable, so we mark its location as special. Using
8125 UNKNOWN_LOCATION has the problem that it gets clobbered in
8126 annotate_one_with_locus. A cleaner solution might be to
8127 ensure ! should_carry_locus_p (stmt), but that needs a flag.
8129 c_finish_return (BUILTINS_LOCATION
, integer_zero_node
, NULL_TREE
);
8132 /* Tie off the statement tree for this function. */
8133 DECL_SAVED_TREE (fndecl
) = pop_stmt_list (DECL_SAVED_TREE (fndecl
));
8135 finish_fname_decls ();
8137 /* Complain if there's just no return statement. */
8138 if (warn_return_type
8139 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl
))) != VOID_TYPE
8140 && !current_function_returns_value
&& !current_function_returns_null
8141 /* Don't complain if we are no-return. */
8142 && !current_function_returns_abnormally
8143 /* Don't complain if we are declared noreturn. */
8144 && !TREE_THIS_VOLATILE (fndecl
)
8145 /* Don't warn for main(). */
8146 && !MAIN_NAME_P (DECL_NAME (fndecl
))
8147 /* Or if they didn't actually specify a return type. */
8148 && !C_FUNCTION_IMPLICIT_INT (fndecl
)
8149 /* Normally, with -Wreturn-type, flow will complain, but we might
8150 optimize out static functions. */
8151 && !TREE_PUBLIC (fndecl
))
8153 warning (OPT_Wreturn_type
,
8154 "no return statement in function returning non-void");
8155 TREE_NO_WARNING (fndecl
) = 1;
8158 /* Complain about parameters that are only set, but never otherwise used. */
8159 if (warn_unused_but_set_parameter
)
8163 for (decl
= DECL_ARGUMENTS (fndecl
);
8165 decl
= DECL_CHAIN (decl
))
8166 if (TREE_USED (decl
)
8167 && TREE_CODE (decl
) == PARM_DECL
8168 && !DECL_READ_P (decl
)
8170 && !DECL_ARTIFICIAL (decl
)
8171 && !TREE_NO_WARNING (decl
))
8172 warning_at (DECL_SOURCE_LOCATION (decl
),
8173 OPT_Wunused_but_set_parameter
,
8174 "parameter %qD set but not used", decl
);
8177 /* Store the end of the function, so that we get good line number
8178 info for the epilogue. */
8179 cfun
->function_end_locus
= input_location
;
8181 /* Finalize the ELF visibility for the function. */
8182 c_determine_visibility (fndecl
);
8184 /* For GNU C extern inline functions disregard inline limits. */
8185 if (DECL_EXTERNAL (fndecl
)
8186 && DECL_DECLARED_INLINE_P (fndecl
))
8187 DECL_DISREGARD_INLINE_LIMITS (fndecl
) = 1;
8189 /* Genericize before inlining. Delay genericizing nested functions
8190 until their parent function is genericized. Since finalizing
8191 requires GENERIC, delay that as well. */
8193 if (DECL_INITIAL (fndecl
) && DECL_INITIAL (fndecl
) != error_mark_node
8194 && !undef_nested_function
)
8196 if (!decl_function_context (fndecl
))
8198 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE
, fndecl
);
8199 c_genericize (fndecl
);
8201 /* ??? Objc emits functions after finalizing the compilation unit.
8202 This should be cleaned up later and this conditional removed. */
8203 if (cgraph_global_info_ready
)
8205 cgraph_add_new_function (fndecl
, false);
8208 cgraph_finalize_function (fndecl
, false);
8212 /* Register this function with cgraph just far enough to get it
8213 added to our parent's nested function list. Handy, since the
8214 C front end doesn't have such a list. */
8215 (void) cgraph_node (fndecl
);
8219 if (!decl_function_context (fndecl
))
8220 undef_nested_function
= false;
8222 /* We're leaving the context of this function, so zap cfun.
8223 It's still in DECL_STRUCT_FUNCTION, and we'll restore it in
8224 tree_rest_of_compilation. */
8226 current_function_decl
= NULL
;
8229 /* Check the declarations given in a for-loop for satisfying the C99
8230 constraints. If exactly one such decl is found, return it. LOC is
8231 the location of the opening parenthesis of the for loop. */
8234 check_for_loop_decls (location_t loc
)
8236 struct c_binding
*b
;
8237 tree one_decl
= NULL_TREE
;
8242 static bool hint
= true;
8243 /* If we get here, declarations have been used in a for loop without
8244 the C99 for loop scope. This doesn't make much sense, so don't
8246 error_at (loc
, "%<for%> loop initial declarations "
8247 "are only allowed in C99 mode");
8251 "use option -std=c99 or -std=gnu99 to compile your code");
8256 /* C99 subclause 6.8.5 paragraph 3:
8258 [#3] The declaration part of a for statement shall only
8259 declare identifiers for objects having storage class auto or
8262 It isn't clear whether, in this sentence, "identifiers" binds to
8263 "shall only declare" or to "objects" - that is, whether all identifiers
8264 declared must be identifiers for objects, or whether the restriction
8265 only applies to those that are. (A question on this in comp.std.c
8266 in November 2000 received no answer.) We implement the strictest
8267 interpretation, to avoid creating an extension which later causes
8270 for (b
= current_scope
->bindings
; b
; b
= b
->prev
)
8273 tree decl
= b
->decl
;
8278 switch (TREE_CODE (decl
))
8282 location_t decl_loc
= DECL_SOURCE_LOCATION (decl
);
8283 if (TREE_STATIC (decl
))
8285 "declaration of static variable %qD in %<for%> loop "
8286 "initial declaration", decl
);
8287 else if (DECL_EXTERNAL (decl
))
8289 "declaration of %<extern%> variable %qD in %<for%> loop "
8290 "initial declaration", decl
);
8296 "%<struct %E%> declared in %<for%> loop initial "
8301 "%<union %E%> declared in %<for%> loop initial declaration",
8305 error_at (loc
, "%<enum %E%> declared in %<for%> loop "
8306 "initial declaration", id
);
8309 error_at (loc
, "declaration of non-variable "
8310 "%qD in %<for%> loop initial declaration", decl
);
8317 return n_decls
== 1 ? one_decl
: NULL_TREE
;
8320 /* Save and reinitialize the variables
8321 used during compilation of a C function. */
8324 c_push_function_context (void)
8326 struct language_function
*p
;
8327 p
= ggc_alloc_language_function ();
8330 p
->base
.x_stmt_tree
= c_stmt_tree
;
8331 p
->x_break_label
= c_break_label
;
8332 p
->x_cont_label
= c_cont_label
;
8333 p
->x_switch_stack
= c_switch_stack
;
8334 p
->arg_info
= current_function_arg_info
;
8335 p
->returns_value
= current_function_returns_value
;
8336 p
->returns_null
= current_function_returns_null
;
8337 p
->returns_abnormally
= current_function_returns_abnormally
;
8338 p
->warn_about_return_type
= warn_about_return_type
;
8340 push_function_context ();
8343 /* Restore the variables used during compilation of a C function. */
8346 c_pop_function_context (void)
8348 struct language_function
*p
;
8350 pop_function_context ();
8352 cfun
->language
= NULL
;
8354 if (DECL_STRUCT_FUNCTION (current_function_decl
) == 0
8355 && DECL_SAVED_TREE (current_function_decl
) == NULL_TREE
)
8357 /* Stop pointing to the local nodes about to be freed. */
8358 /* But DECL_INITIAL must remain nonzero so we know this
8359 was an actual function definition. */
8360 DECL_INITIAL (current_function_decl
) = error_mark_node
;
8361 DECL_ARGUMENTS (current_function_decl
) = 0;
8364 c_stmt_tree
= p
->base
.x_stmt_tree
;
8365 c_break_label
= p
->x_break_label
;
8366 c_cont_label
= p
->x_cont_label
;
8367 c_switch_stack
= p
->x_switch_stack
;
8368 current_function_arg_info
= p
->arg_info
;
8369 current_function_returns_value
= p
->returns_value
;
8370 current_function_returns_null
= p
->returns_null
;
8371 current_function_returns_abnormally
= p
->returns_abnormally
;
8372 warn_about_return_type
= p
->warn_about_return_type
;
8375 /* The functions below are required for functionality of doing
8376 function at once processing in the C front end. Currently these
8377 functions are not called from anywhere in the C front end, but as
8378 these changes continue, that will change. */
8380 /* Returns the stmt_tree (if any) to which statements are currently
8381 being added. If there is no active statement-tree, NULL is
8385 current_stmt_tree (void)
8387 return &c_stmt_tree
;
8390 /* Return the global value of T as a symbol. */
8393 identifier_global_value (tree t
)
8395 struct c_binding
*b
;
8397 for (b
= I_SYMBOL_BINDING (t
); b
; b
= b
->shadowed
)
8398 if (B_IN_FILE_SCOPE (b
) || B_IN_EXTERNAL_SCOPE (b
))
8404 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
8405 otherwise the name is found in ridpointers from RID_INDEX. */
8408 record_builtin_type (enum rid rid_index
, const char *name
, tree type
)
8412 id
= ridpointers
[(int) rid_index
];
8414 id
= get_identifier (name
);
8415 decl
= build_decl (UNKNOWN_LOCATION
, TYPE_DECL
, id
, type
);
8417 if (debug_hooks
->type_decl
)
8418 debug_hooks
->type_decl (decl
, false);
8421 /* Build the void_list_node (void_type_node having been created). */
8423 build_void_list_node (void)
8425 tree t
= build_tree_list (NULL_TREE
, void_type_node
);
8429 /* Return a c_parm structure with the given SPECS, ATTRS and DECLARATOR. */
8432 build_c_parm (struct c_declspecs
*specs
, tree attrs
,
8433 struct c_declarator
*declarator
)
8435 struct c_parm
*ret
= XOBNEW (&parser_obstack
, struct c_parm
);
8438 ret
->declarator
= declarator
;
8442 /* Return a declarator with nested attributes. TARGET is the inner
8443 declarator to which these attributes apply. ATTRS are the
8446 struct c_declarator
*
8447 build_attrs_declarator (tree attrs
, struct c_declarator
*target
)
8449 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
8450 ret
->kind
= cdk_attrs
;
8451 ret
->declarator
= target
;
8452 ret
->u
.attrs
= attrs
;
8456 /* Return a declarator for a function with arguments specified by ARGS
8457 and return type specified by TARGET. */
8459 struct c_declarator
*
8460 build_function_declarator (struct c_arg_info
*args
,
8461 struct c_declarator
*target
)
8463 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
8464 ret
->kind
= cdk_function
;
8465 ret
->declarator
= target
;
8466 ret
->u
.arg_info
= args
;
8470 /* Return a declarator for the identifier IDENT (which may be
8471 NULL_TREE for an abstract declarator). */
8473 struct c_declarator
*
8474 build_id_declarator (tree ident
)
8476 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
8478 ret
->declarator
= 0;
8480 /* Default value - may get reset to a more precise location. */
8481 ret
->id_loc
= input_location
;
8485 /* Return something to represent absolute declarators containing a *.
8486 TARGET is the absolute declarator that the * contains.
8487 TYPE_QUALS_ATTRS is a structure for type qualifiers and attributes
8488 to apply to the pointer type. */
8490 struct c_declarator
*
8491 make_pointer_declarator (struct c_declspecs
*type_quals_attrs
,
8492 struct c_declarator
*target
)
8496 struct c_declarator
*itarget
= target
;
8497 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
8498 if (type_quals_attrs
)
8500 attrs
= type_quals_attrs
->attrs
;
8501 quals
= quals_from_declspecs (type_quals_attrs
);
8502 if (attrs
!= NULL_TREE
)
8503 itarget
= build_attrs_declarator (attrs
, target
);
8505 ret
->kind
= cdk_pointer
;
8506 ret
->declarator
= itarget
;
8507 ret
->u
.pointer_quals
= quals
;
8511 /* Return a pointer to a structure for an empty list of declaration
8514 struct c_declspecs
*
8515 build_null_declspecs (void)
8517 struct c_declspecs
*ret
= XOBNEW (&parser_obstack
, struct c_declspecs
);
8522 ret
->typespec_word
= cts_none
;
8523 ret
->storage_class
= csc_none
;
8524 ret
->expr_const_operands
= true;
8525 ret
->declspecs_seen_p
= false;
8526 ret
->type_seen_p
= false;
8527 ret
->non_sc_seen_p
= false;
8528 ret
->typedef_p
= false;
8529 ret
->tag_defined_p
= false;
8530 ret
->explicit_signed_p
= false;
8531 ret
->deprecated_p
= false;
8532 ret
->default_int_p
= false;
8533 ret
->long_p
= false;
8534 ret
->long_long_p
= false;
8535 ret
->short_p
= false;
8536 ret
->signed_p
= false;
8537 ret
->unsigned_p
= false;
8538 ret
->complex_p
= false;
8539 ret
->inline_p
= false;
8540 ret
->thread_p
= false;
8541 ret
->const_p
= false;
8542 ret
->volatile_p
= false;
8543 ret
->restrict_p
= false;
8544 ret
->saturating_p
= false;
8545 ret
->address_space
= ADDR_SPACE_GENERIC
;
8549 /* Add the address space ADDRSPACE to the declaration specifiers
8550 SPECS, returning SPECS. */
8552 struct c_declspecs
*
8553 declspecs_add_addrspace (struct c_declspecs
*specs
, addr_space_t as
)
8555 specs
->non_sc_seen_p
= true;
8556 specs
->declspecs_seen_p
= true;
8558 if (!ADDR_SPACE_GENERIC_P (specs
->address_space
)
8559 && specs
->address_space
!= as
)
8560 error ("incompatible address space qualifiers %qs and %qs",
8561 c_addr_space_name (as
),
8562 c_addr_space_name (specs
->address_space
));
8564 specs
->address_space
= as
;
8568 /* Add the type qualifier QUAL to the declaration specifiers SPECS,
8571 struct c_declspecs
*
8572 declspecs_add_qual (struct c_declspecs
*specs
, tree qual
)
8576 specs
->non_sc_seen_p
= true;
8577 specs
->declspecs_seen_p
= true;
8578 gcc_assert (TREE_CODE (qual
) == IDENTIFIER_NODE
8579 && C_IS_RESERVED_WORD (qual
));
8580 i
= C_RID_CODE (qual
);
8584 dupe
= specs
->const_p
;
8585 specs
->const_p
= true;
8588 dupe
= specs
->volatile_p
;
8589 specs
->volatile_p
= true;
8592 dupe
= specs
->restrict_p
;
8593 specs
->restrict_p
= true;
8598 if (dupe
&& !flag_isoc99
)
8599 pedwarn (input_location
, OPT_pedantic
, "duplicate %qE", qual
);
8603 /* Add the type specifier TYPE to the declaration specifiers SPECS,
8606 struct c_declspecs
*
8607 declspecs_add_type (location_t loc
, struct c_declspecs
*specs
,
8608 struct c_typespec spec
)
8610 tree type
= spec
.spec
;
8611 specs
->non_sc_seen_p
= true;
8612 specs
->declspecs_seen_p
= true;
8613 specs
->type_seen_p
= true;
8614 if (TREE_DEPRECATED (type
))
8615 specs
->deprecated_p
= true;
8617 /* Handle type specifier keywords. */
8618 if (TREE_CODE (type
) == IDENTIFIER_NODE
8619 && C_IS_RESERVED_WORD (type
)
8620 && C_RID_CODE (type
) != RID_CXX_COMPAT_WARN
)
8622 enum rid i
= C_RID_CODE (type
);
8625 error_at (loc
, "two or more data types in declaration specifiers");
8628 if ((int) i
<= (int) RID_LAST_MODIFIER
)
8630 /* "long", "short", "signed", "unsigned", "_Complex" or "_Sat". */
8635 if (specs
->long_long_p
)
8637 error_at (loc
, "%<long long long%> is too long for GCC");
8642 if (specs
->typespec_word
== cts_double
)
8645 ("both %<long long%> and %<double%> in "
8646 "declaration specifiers"));
8649 pedwarn_c90 (loc
, OPT_Wlong_long
,
8650 "ISO C90 does not support %<long long%>");
8651 specs
->long_long_p
= 1;
8656 ("both %<long%> and %<short%> in "
8657 "declaration specifiers"));
8658 else if (specs
->typespec_word
== cts_void
)
8660 ("both %<long%> and %<void%> in "
8661 "declaration specifiers"));
8662 else if (specs
->typespec_word
== cts_int128
)
8664 ("both %<long%> and %<__int128%> in "
8665 "declaration specifiers"));
8666 else if (specs
->typespec_word
== cts_bool
)
8668 ("both %<long%> and %<_Bool%> in "
8669 "declaration specifiers"));
8670 else if (specs
->typespec_word
== cts_char
)
8672 ("both %<long%> and %<char%> in "
8673 "declaration specifiers"));
8674 else if (specs
->typespec_word
== cts_float
)
8676 ("both %<long%> and %<float%> in "
8677 "declaration specifiers"));
8678 else if (specs
->typespec_word
== cts_dfloat32
)
8680 ("both %<long%> and %<_Decimal32%> in "
8681 "declaration specifiers"));
8682 else if (specs
->typespec_word
== cts_dfloat64
)
8684 ("both %<long%> and %<_Decimal64%> in "
8685 "declaration specifiers"));
8686 else if (specs
->typespec_word
== cts_dfloat128
)
8688 ("both %<long%> and %<_Decimal128%> in "
8689 "declaration specifiers"));
8691 specs
->long_p
= true;
8694 dupe
= specs
->short_p
;
8697 ("both %<long%> and %<short%> in "
8698 "declaration specifiers"));
8699 else if (specs
->typespec_word
== cts_void
)
8701 ("both %<short%> and %<void%> in "
8702 "declaration specifiers"));
8703 else if (specs
->typespec_word
== cts_int128
)
8705 ("both %<short%> and %<__int128%> in "
8706 "declaration specifiers"));
8707 else if (specs
->typespec_word
== cts_bool
)
8709 ("both %<short%> and %<_Bool%> in "
8710 "declaration specifiers"));
8711 else if (specs
->typespec_word
== cts_char
)
8713 ("both %<short%> and %<char%> in "
8714 "declaration specifiers"));
8715 else if (specs
->typespec_word
== cts_float
)
8717 ("both %<short%> and %<float%> in "
8718 "declaration specifiers"));
8719 else if (specs
->typespec_word
== cts_double
)
8721 ("both %<short%> and %<double%> in "
8722 "declaration specifiers"));
8723 else if (specs
->typespec_word
== cts_dfloat32
)
8725 ("both %<short%> and %<_Decimal32%> in "
8726 "declaration specifiers"));
8727 else if (specs
->typespec_word
== cts_dfloat64
)
8729 ("both %<short%> and %<_Decimal64%> in "
8730 "declaration specifiers"));
8731 else if (specs
->typespec_word
== cts_dfloat128
)
8733 ("both %<short%> and %<_Decimal128%> in "
8734 "declaration specifiers"));
8736 specs
->short_p
= true;
8739 dupe
= specs
->signed_p
;
8740 if (specs
->unsigned_p
)
8742 ("both %<signed%> and %<unsigned%> in "
8743 "declaration specifiers"));
8744 else if (specs
->typespec_word
== cts_void
)
8746 ("both %<signed%> and %<void%> in "
8747 "declaration specifiers"));
8748 else if (specs
->typespec_word
== cts_bool
)
8750 ("both %<signed%> and %<_Bool%> in "
8751 "declaration specifiers"));
8752 else if (specs
->typespec_word
== cts_float
)
8754 ("both %<signed%> and %<float%> in "
8755 "declaration specifiers"));
8756 else if (specs
->typespec_word
== cts_double
)
8758 ("both %<signed%> and %<double%> in "
8759 "declaration specifiers"));
8760 else if (specs
->typespec_word
== cts_dfloat32
)
8762 ("both %<signed%> and %<_Decimal32%> in "
8763 "declaration specifiers"));
8764 else if (specs
->typespec_word
== cts_dfloat64
)
8766 ("both %<signed%> and %<_Decimal64%> in "
8767 "declaration specifiers"));
8768 else if (specs
->typespec_word
== cts_dfloat128
)
8770 ("both %<signed%> and %<_Decimal128%> in "
8771 "declaration specifiers"));
8773 specs
->signed_p
= true;
8776 dupe
= specs
->unsigned_p
;
8777 if (specs
->signed_p
)
8779 ("both %<signed%> and %<unsigned%> in "
8780 "declaration specifiers"));
8781 else if (specs
->typespec_word
== cts_void
)
8783 ("both %<unsigned%> and %<void%> in "
8784 "declaration specifiers"));
8785 else if (specs
->typespec_word
== cts_bool
)
8787 ("both %<unsigned%> and %<_Bool%> in "
8788 "declaration specifiers"));
8789 else if (specs
->typespec_word
== cts_float
)
8791 ("both %<unsigned%> and %<float%> in "
8792 "declaration specifiers"));
8793 else if (specs
->typespec_word
== cts_double
)
8795 ("both %<unsigned%> and %<double%> in "
8796 "declaration specifiers"));
8797 else if (specs
->typespec_word
== cts_dfloat32
)
8799 ("both %<unsigned%> and %<_Decimal32%> in "
8800 "declaration specifiers"));
8801 else if (specs
->typespec_word
== cts_dfloat64
)
8803 ("both %<unsigned%> and %<_Decimal64%> in "
8804 "declaration specifiers"));
8805 else if (specs
->typespec_word
== cts_dfloat128
)
8807 ("both %<unsigned%> and %<_Decimal128%> in "
8808 "declaration specifiers"));
8810 specs
->unsigned_p
= true;
8813 dupe
= specs
->complex_p
;
8814 if (!flag_isoc99
&& !in_system_header
)
8815 pedwarn (loc
, OPT_pedantic
,
8816 "ISO C90 does not support complex types");
8817 if (specs
->typespec_word
== cts_void
)
8819 ("both %<complex%> and %<void%> in "
8820 "declaration specifiers"));
8821 else if (specs
->typespec_word
== cts_bool
)
8823 ("both %<complex%> and %<_Bool%> in "
8824 "declaration specifiers"));
8825 else if (specs
->typespec_word
== cts_dfloat32
)
8827 ("both %<complex%> and %<_Decimal32%> in "
8828 "declaration specifiers"));
8829 else if (specs
->typespec_word
== cts_dfloat64
)
8831 ("both %<complex%> and %<_Decimal64%> in "
8832 "declaration specifiers"));
8833 else if (specs
->typespec_word
== cts_dfloat128
)
8835 ("both %<complex%> and %<_Decimal128%> in "
8836 "declaration specifiers"));
8837 else if (specs
->typespec_word
== cts_fract
)
8839 ("both %<complex%> and %<_Fract%> in "
8840 "declaration specifiers"));
8841 else if (specs
->typespec_word
== cts_accum
)
8843 ("both %<complex%> and %<_Accum%> in "
8844 "declaration specifiers"));
8845 else if (specs
->saturating_p
)
8847 ("both %<complex%> and %<_Sat%> in "
8848 "declaration specifiers"));
8850 specs
->complex_p
= true;
8853 dupe
= specs
->saturating_p
;
8854 pedwarn (loc
, OPT_pedantic
,
8855 "ISO C does not support saturating types");
8856 if (specs
->typespec_word
== cts_int128
)
8859 ("both %<_Sat%> and %<__int128%> in "
8860 "declaration specifiers"));
8862 else if (specs
->typespec_word
== cts_void
)
8864 ("both %<_Sat%> and %<void%> in "
8865 "declaration specifiers"));
8866 else if (specs
->typespec_word
== cts_bool
)
8868 ("both %<_Sat%> and %<_Bool%> in "
8869 "declaration specifiers"));
8870 else if (specs
->typespec_word
== cts_char
)
8872 ("both %<_Sat%> and %<char%> in "
8873 "declaration specifiers"));
8874 else if (specs
->typespec_word
== cts_int
)
8876 ("both %<_Sat%> and %<int%> in "
8877 "declaration specifiers"));
8878 else if (specs
->typespec_word
== cts_float
)
8880 ("both %<_Sat%> and %<float%> in "
8881 "declaration specifiers"));
8882 else if (specs
->typespec_word
== cts_double
)
8884 ("both %<_Sat%> and %<double%> in "
8885 "declaration specifiers"));
8886 else if (specs
->typespec_word
== cts_dfloat32
)
8888 ("both %<_Sat%> and %<_Decimal32%> in "
8889 "declaration specifiers"));
8890 else if (specs
->typespec_word
== cts_dfloat64
)
8892 ("both %<_Sat%> and %<_Decimal64%> in "
8893 "declaration specifiers"));
8894 else if (specs
->typespec_word
== cts_dfloat128
)
8896 ("both %<_Sat%> and %<_Decimal128%> in "
8897 "declaration specifiers"));
8898 else if (specs
->complex_p
)
8900 ("both %<_Sat%> and %<complex%> in "
8901 "declaration specifiers"));
8903 specs
->saturating_p
= true;
8910 error_at (loc
, "duplicate %qE", type
);
8916 /* "void", "_Bool", "char", "int", "float", "double", "_Decimal32",
8917 "__int128", "_Decimal64", "_Decimal128", "_Fract" or "_Accum". */
8918 if (specs
->typespec_word
!= cts_none
)
8921 "two or more data types in declaration specifiers");
8927 if (int128_integer_type_node
== NULL_TREE
)
8929 error_at (loc
, "%<__int128%> is not supported for this target");
8932 if (!in_system_header
)
8933 pedwarn (loc
, OPT_pedantic
,
8934 "ISO C does not support %<__int128%> type");
8938 ("both %<__int128%> and %<long%> in "
8939 "declaration specifiers"));
8940 else if (specs
->saturating_p
)
8942 ("both %<_Sat%> and %<__int128%> in "
8943 "declaration specifiers"));
8944 else if (specs
->short_p
)
8946 ("both %<__int128%> and %<short%> in "
8947 "declaration specifiers"));
8949 specs
->typespec_word
= cts_int128
;
8954 ("both %<long%> and %<void%> in "
8955 "declaration specifiers"));
8956 else if (specs
->short_p
)
8958 ("both %<short%> and %<void%> in "
8959 "declaration specifiers"));
8960 else if (specs
->signed_p
)
8962 ("both %<signed%> and %<void%> in "
8963 "declaration specifiers"));
8964 else if (specs
->unsigned_p
)
8966 ("both %<unsigned%> and %<void%> in "
8967 "declaration specifiers"));
8968 else if (specs
->complex_p
)
8970 ("both %<complex%> and %<void%> in "
8971 "declaration specifiers"));
8972 else if (specs
->saturating_p
)
8974 ("both %<_Sat%> and %<void%> in "
8975 "declaration specifiers"));
8977 specs
->typespec_word
= cts_void
;
8982 ("both %<long%> and %<_Bool%> in "
8983 "declaration specifiers"));
8984 else if (specs
->short_p
)
8986 ("both %<short%> and %<_Bool%> in "
8987 "declaration specifiers"));
8988 else if (specs
->signed_p
)
8990 ("both %<signed%> and %<_Bool%> in "
8991 "declaration specifiers"));
8992 else if (specs
->unsigned_p
)
8994 ("both %<unsigned%> and %<_Bool%> in "
8995 "declaration specifiers"));
8996 else if (specs
->complex_p
)
8998 ("both %<complex%> and %<_Bool%> in "
8999 "declaration specifiers"));
9000 else if (specs
->saturating_p
)
9002 ("both %<_Sat%> and %<_Bool%> in "
9003 "declaration specifiers"));
9005 specs
->typespec_word
= cts_bool
;
9010 ("both %<long%> and %<char%> in "
9011 "declaration specifiers"));
9012 else if (specs
->short_p
)
9014 ("both %<short%> and %<char%> in "
9015 "declaration specifiers"));
9016 else if (specs
->saturating_p
)
9018 ("both %<_Sat%> and %<char%> in "
9019 "declaration specifiers"));
9021 specs
->typespec_word
= cts_char
;
9024 if (specs
->saturating_p
)
9026 ("both %<_Sat%> and %<int%> in "
9027 "declaration specifiers"));
9029 specs
->typespec_word
= cts_int
;
9034 ("both %<long%> and %<float%> in "
9035 "declaration specifiers"));
9036 else if (specs
->short_p
)
9038 ("both %<short%> and %<float%> in "
9039 "declaration specifiers"));
9040 else if (specs
->signed_p
)
9042 ("both %<signed%> and %<float%> in "
9043 "declaration specifiers"));
9044 else if (specs
->unsigned_p
)
9046 ("both %<unsigned%> and %<float%> in "
9047 "declaration specifiers"));
9048 else if (specs
->saturating_p
)
9050 ("both %<_Sat%> and %<float%> in "
9051 "declaration specifiers"));
9053 specs
->typespec_word
= cts_float
;
9056 if (specs
->long_long_p
)
9058 ("both %<long long%> and %<double%> in "
9059 "declaration specifiers"));
9060 else if (specs
->short_p
)
9062 ("both %<short%> and %<double%> in "
9063 "declaration specifiers"));
9064 else if (specs
->signed_p
)
9066 ("both %<signed%> and %<double%> in "
9067 "declaration specifiers"));
9068 else if (specs
->unsigned_p
)
9070 ("both %<unsigned%> and %<double%> in "
9071 "declaration specifiers"));
9072 else if (specs
->saturating_p
)
9074 ("both %<_Sat%> and %<double%> in "
9075 "declaration specifiers"));
9077 specs
->typespec_word
= cts_double
;
9084 if (i
== RID_DFLOAT32
)
9086 else if (i
== RID_DFLOAT64
)
9089 str
= "_Decimal128";
9090 if (specs
->long_long_p
)
9092 ("both %<long long%> and %<%s%> in "
9093 "declaration specifiers"),
9097 ("both %<long%> and %<%s%> in "
9098 "declaration specifiers"),
9100 else if (specs
->short_p
)
9102 ("both %<short%> and %<%s%> in "
9103 "declaration specifiers"),
9105 else if (specs
->signed_p
)
9107 ("both %<signed%> and %<%s%> in "
9108 "declaration specifiers"),
9110 else if (specs
->unsigned_p
)
9112 ("both %<unsigned%> and %<%s%> in "
9113 "declaration specifiers"),
9115 else if (specs
->complex_p
)
9117 ("both %<complex%> and %<%s%> in "
9118 "declaration specifiers"),
9120 else if (specs
->saturating_p
)
9122 ("both %<_Sat%> and %<%s%> in "
9123 "declaration specifiers"),
9125 else if (i
== RID_DFLOAT32
)
9126 specs
->typespec_word
= cts_dfloat32
;
9127 else if (i
== RID_DFLOAT64
)
9128 specs
->typespec_word
= cts_dfloat64
;
9130 specs
->typespec_word
= cts_dfloat128
;
9132 if (!targetm
.decimal_float_supported_p ())
9134 ("decimal floating point not supported "
9135 "for this target"));
9136 pedwarn (loc
, OPT_pedantic
,
9137 "ISO C does not support decimal floating point");
9147 if (specs
->complex_p
)
9149 ("both %<complex%> and %<%s%> in "
9150 "declaration specifiers"),
9152 else if (i
== RID_FRACT
)
9153 specs
->typespec_word
= cts_fract
;
9155 specs
->typespec_word
= cts_accum
;
9157 if (!targetm
.fixed_point_supported_p ())
9159 "fixed-point types not supported for this target");
9160 pedwarn (loc
, OPT_pedantic
,
9161 "ISO C does not support fixed-point types");
9164 /* ObjC reserved word "id", handled below. */
9170 /* Now we have a typedef (a TYPE_DECL node), an identifier (some
9171 form of ObjC type, cases such as "int" and "long" being handled
9172 above), a TYPE (struct, union, enum and typeof specifiers) or an
9173 ERROR_MARK. In none of these cases may there have previously
9174 been any type specifiers. */
9175 if (specs
->type
|| specs
->typespec_word
!= cts_none
9176 || specs
->long_p
|| specs
->short_p
|| specs
->signed_p
9177 || specs
->unsigned_p
|| specs
->complex_p
)
9178 error_at (loc
, "two or more data types in declaration specifiers");
9179 else if (TREE_CODE (type
) == TYPE_DECL
)
9181 if (TREE_TYPE (type
) == error_mark_node
)
9182 ; /* Allow the type to default to int to avoid cascading errors. */
9185 specs
->type
= TREE_TYPE (type
);
9186 specs
->decl_attr
= DECL_ATTRIBUTES (type
);
9187 specs
->typedef_p
= true;
9188 specs
->explicit_signed_p
= C_TYPEDEF_EXPLICITLY_SIGNED (type
);
9190 /* If this typedef name is defined in a struct, then a C++
9191 lookup would return a different value. */
9193 && I_SYMBOL_BINDING (DECL_NAME (type
))->in_struct
)
9194 warning_at (loc
, OPT_Wc___compat
,
9195 "C++ lookup of %qD would return a field, not a type",
9198 /* If we are parsing a struct, record that a struct field
9200 if (warn_cxx_compat
&& struct_parse_info
!= NULL
)
9201 VEC_safe_push (tree
, heap
, struct_parse_info
->typedefs_seen
, type
);
9204 else if (TREE_CODE (type
) == IDENTIFIER_NODE
)
9206 tree t
= lookup_name (type
);
9207 if (!t
|| TREE_CODE (t
) != TYPE_DECL
)
9208 error_at (loc
, "%qE fails to be a typedef or built in type", type
);
9209 else if (TREE_TYPE (t
) == error_mark_node
)
9212 specs
->type
= TREE_TYPE (t
);
9214 else if (TREE_CODE (type
) != ERROR_MARK
)
9216 if (spec
.kind
== ctsk_tagdef
|| spec
.kind
== ctsk_tagfirstref
)
9217 specs
->tag_defined_p
= true;
9218 if (spec
.kind
== ctsk_typeof
)
9220 specs
->typedef_p
= true;
9224 specs
->expr
= build2 (COMPOUND_EXPR
, TREE_TYPE (spec
.expr
),
9225 specs
->expr
, spec
.expr
);
9227 specs
->expr
= spec
.expr
;
9228 specs
->expr_const_operands
&= spec
.expr_const_operands
;
9237 /* Add the storage class specifier or function specifier SCSPEC to the
9238 declaration specifiers SPECS, returning SPECS. */
9240 struct c_declspecs
*
9241 declspecs_add_scspec (struct c_declspecs
*specs
, tree scspec
)
9244 enum c_storage_class n
= csc_none
;
9246 specs
->declspecs_seen_p
= true;
9247 gcc_assert (TREE_CODE (scspec
) == IDENTIFIER_NODE
9248 && C_IS_RESERVED_WORD (scspec
));
9249 i
= C_RID_CODE (scspec
);
9250 if (specs
->non_sc_seen_p
)
9251 warning (OPT_Wold_style_declaration
,
9252 "%qE is not at beginning of declaration", scspec
);
9256 /* C99 permits duplicate inline. Although of doubtful utility,
9257 it seems simplest to permit it in gnu89 mode as well, as
9258 there is also little utility in maintaining this as a
9259 difference between gnu89 and C99 inline. */
9261 specs
->inline_p
= true;
9264 dupe
= specs
->thread_p
;
9265 if (specs
->storage_class
== csc_auto
)
9266 error ("%<__thread%> used with %<auto%>");
9267 else if (specs
->storage_class
== csc_register
)
9268 error ("%<__thread%> used with %<register%>");
9269 else if (specs
->storage_class
== csc_typedef
)
9270 error ("%<__thread%> used with %<typedef%>");
9272 specs
->thread_p
= true;
9279 /* Diagnose "__thread extern". */
9280 if (specs
->thread_p
)
9281 error ("%<__thread%> before %<extern%>");
9288 /* Diagnose "__thread static". */
9289 if (specs
->thread_p
)
9290 error ("%<__thread%> before %<static%>");
9298 if (n
!= csc_none
&& n
== specs
->storage_class
)
9301 error ("duplicate %qE", scspec
);
9304 if (specs
->storage_class
!= csc_none
&& n
!= specs
->storage_class
)
9306 error ("multiple storage classes in declaration specifiers");
9310 specs
->storage_class
= n
;
9311 if (n
!= csc_extern
&& n
!= csc_static
&& specs
->thread_p
)
9313 error ("%<__thread%> used with %qE", scspec
);
9314 specs
->thread_p
= false;
9321 /* Add the attributes ATTRS to the declaration specifiers SPECS,
9324 struct c_declspecs
*
9325 declspecs_add_attrs (struct c_declspecs
*specs
, tree attrs
)
9327 specs
->attrs
= chainon (attrs
, specs
->attrs
);
9328 specs
->declspecs_seen_p
= true;
9332 /* Combine "long", "short", "signed", "unsigned" and "_Complex" type
9333 specifiers with any other type specifier to determine the resulting
9334 type. This is where ISO C checks on complex types are made, since
9335 "_Complex long" is a prefix of the valid ISO C type "_Complex long
9338 struct c_declspecs
*
9339 finish_declspecs (struct c_declspecs
*specs
)
9341 /* If a type was specified as a whole, we have no modifiers and are
9343 if (specs
->type
!= NULL_TREE
)
9345 gcc_assert (!specs
->long_p
&& !specs
->long_long_p
&& !specs
->short_p
9346 && !specs
->signed_p
&& !specs
->unsigned_p
9347 && !specs
->complex_p
);
9351 /* If none of "void", "_Bool", "char", "int", "float" or "double"
9352 has been specified, treat it as "int" unless "_Complex" is
9353 present and there are no other specifiers. If we just have
9354 "_Complex", it is equivalent to "_Complex double", but e.g.
9355 "_Complex short" is equivalent to "_Complex short int". */
9356 if (specs
->typespec_word
== cts_none
)
9358 if (specs
->saturating_p
)
9360 error ("%<_Sat%> is used without %<_Fract%> or %<_Accum%>");
9361 if (!targetm
.fixed_point_supported_p ())
9362 error ("fixed-point types not supported for this target");
9363 specs
->typespec_word
= cts_fract
;
9365 else if (specs
->long_p
|| specs
->short_p
9366 || specs
->signed_p
|| specs
->unsigned_p
)
9368 specs
->typespec_word
= cts_int
;
9370 else if (specs
->complex_p
)
9372 specs
->typespec_word
= cts_double
;
9373 pedwarn (input_location
, OPT_pedantic
,
9374 "ISO C does not support plain %<complex%> meaning "
9375 "%<double complex%>");
9379 specs
->typespec_word
= cts_int
;
9380 specs
->default_int_p
= true;
9381 /* We don't diagnose this here because grokdeclarator will
9382 give more specific diagnostics according to whether it is
9383 a function definition. */
9387 /* If "signed" was specified, record this to distinguish "int" and
9388 "signed int" in the case of a bit-field with
9389 -funsigned-bitfields. */
9390 specs
->explicit_signed_p
= specs
->signed_p
;
9392 /* Now compute the actual type. */
9393 switch (specs
->typespec_word
)
9396 gcc_assert (!specs
->long_p
&& !specs
->short_p
9397 && !specs
->signed_p
&& !specs
->unsigned_p
9398 && !specs
->complex_p
);
9399 specs
->type
= void_type_node
;
9402 gcc_assert (!specs
->long_p
&& !specs
->short_p
9403 && !specs
->signed_p
&& !specs
->unsigned_p
9404 && !specs
->complex_p
);
9405 specs
->type
= boolean_type_node
;
9408 gcc_assert (!specs
->long_p
&& !specs
->short_p
);
9409 gcc_assert (!(specs
->signed_p
&& specs
->unsigned_p
));
9410 if (specs
->signed_p
)
9411 specs
->type
= signed_char_type_node
;
9412 else if (specs
->unsigned_p
)
9413 specs
->type
= unsigned_char_type_node
;
9415 specs
->type
= char_type_node
;
9416 if (specs
->complex_p
)
9418 pedwarn (input_location
, OPT_pedantic
,
9419 "ISO C does not support complex integer types");
9420 specs
->type
= build_complex_type (specs
->type
);
9424 gcc_assert (!specs
->long_p
&& !specs
->short_p
&& !specs
->long_long_p
);
9425 gcc_assert (!(specs
->signed_p
&& specs
->unsigned_p
));
9426 specs
->type
= (specs
->unsigned_p
9427 ? int128_unsigned_type_node
9428 : int128_integer_type_node
);
9429 if (specs
->complex_p
)
9431 pedwarn (input_location
, OPT_pedantic
,
9432 "ISO C does not support complex integer types");
9433 specs
->type
= build_complex_type (specs
->type
);
9437 gcc_assert (!(specs
->long_p
&& specs
->short_p
));
9438 gcc_assert (!(specs
->signed_p
&& specs
->unsigned_p
));
9439 if (specs
->long_long_p
)
9440 specs
->type
= (specs
->unsigned_p
9441 ? long_long_unsigned_type_node
9442 : long_long_integer_type_node
);
9443 else if (specs
->long_p
)
9444 specs
->type
= (specs
->unsigned_p
9445 ? long_unsigned_type_node
9446 : long_integer_type_node
);
9447 else if (specs
->short_p
)
9448 specs
->type
= (specs
->unsigned_p
9449 ? short_unsigned_type_node
9450 : short_integer_type_node
);
9452 specs
->type
= (specs
->unsigned_p
9453 ? unsigned_type_node
9454 : integer_type_node
);
9455 if (specs
->complex_p
)
9457 pedwarn (input_location
, OPT_pedantic
,
9458 "ISO C does not support complex integer types");
9459 specs
->type
= build_complex_type (specs
->type
);
9463 gcc_assert (!specs
->long_p
&& !specs
->short_p
9464 && !specs
->signed_p
&& !specs
->unsigned_p
);
9465 specs
->type
= (specs
->complex_p
9466 ? complex_float_type_node
9470 gcc_assert (!specs
->long_long_p
&& !specs
->short_p
9471 && !specs
->signed_p
&& !specs
->unsigned_p
);
9474 specs
->type
= (specs
->complex_p
9475 ? complex_long_double_type_node
9476 : long_double_type_node
);
9480 specs
->type
= (specs
->complex_p
9481 ? complex_double_type_node
9482 : double_type_node
);
9488 gcc_assert (!specs
->long_p
&& !specs
->long_long_p
&& !specs
->short_p
9489 && !specs
->signed_p
&& !specs
->unsigned_p
&& !specs
->complex_p
);
9490 if (specs
->typespec_word
== cts_dfloat32
)
9491 specs
->type
= dfloat32_type_node
;
9492 else if (specs
->typespec_word
== cts_dfloat64
)
9493 specs
->type
= dfloat64_type_node
;
9495 specs
->type
= dfloat128_type_node
;
9498 gcc_assert (!specs
->complex_p
);
9499 if (!targetm
.fixed_point_supported_p ())
9500 specs
->type
= integer_type_node
;
9501 else if (specs
->saturating_p
)
9503 if (specs
->long_long_p
)
9504 specs
->type
= specs
->unsigned_p
9505 ? sat_unsigned_long_long_fract_type_node
9506 : sat_long_long_fract_type_node
;
9507 else if (specs
->long_p
)
9508 specs
->type
= specs
->unsigned_p
9509 ? sat_unsigned_long_fract_type_node
9510 : sat_long_fract_type_node
;
9511 else if (specs
->short_p
)
9512 specs
->type
= specs
->unsigned_p
9513 ? sat_unsigned_short_fract_type_node
9514 : sat_short_fract_type_node
;
9516 specs
->type
= specs
->unsigned_p
9517 ? sat_unsigned_fract_type_node
9518 : sat_fract_type_node
;
9522 if (specs
->long_long_p
)
9523 specs
->type
= specs
->unsigned_p
9524 ? unsigned_long_long_fract_type_node
9525 : long_long_fract_type_node
;
9526 else if (specs
->long_p
)
9527 specs
->type
= specs
->unsigned_p
9528 ? unsigned_long_fract_type_node
9529 : long_fract_type_node
;
9530 else if (specs
->short_p
)
9531 specs
->type
= specs
->unsigned_p
9532 ? unsigned_short_fract_type_node
9533 : short_fract_type_node
;
9535 specs
->type
= specs
->unsigned_p
9536 ? unsigned_fract_type_node
9541 gcc_assert (!specs
->complex_p
);
9542 if (!targetm
.fixed_point_supported_p ())
9543 specs
->type
= integer_type_node
;
9544 else if (specs
->saturating_p
)
9546 if (specs
->long_long_p
)
9547 specs
->type
= specs
->unsigned_p
9548 ? sat_unsigned_long_long_accum_type_node
9549 : sat_long_long_accum_type_node
;
9550 else if (specs
->long_p
)
9551 specs
->type
= specs
->unsigned_p
9552 ? sat_unsigned_long_accum_type_node
9553 : sat_long_accum_type_node
;
9554 else if (specs
->short_p
)
9555 specs
->type
= specs
->unsigned_p
9556 ? sat_unsigned_short_accum_type_node
9557 : sat_short_accum_type_node
;
9559 specs
->type
= specs
->unsigned_p
9560 ? sat_unsigned_accum_type_node
9561 : sat_accum_type_node
;
9565 if (specs
->long_long_p
)
9566 specs
->type
= specs
->unsigned_p
9567 ? unsigned_long_long_accum_type_node
9568 : long_long_accum_type_node
;
9569 else if (specs
->long_p
)
9570 specs
->type
= specs
->unsigned_p
9571 ? unsigned_long_accum_type_node
9572 : long_accum_type_node
;
9573 else if (specs
->short_p
)
9574 specs
->type
= specs
->unsigned_p
9575 ? unsigned_short_accum_type_node
9576 : short_accum_type_node
;
9578 specs
->type
= specs
->unsigned_p
9579 ? unsigned_accum_type_node
9590 /* A subroutine of c_write_global_declarations. Perform final processing
9591 on one file scope's declarations (or the external scope's declarations),
9595 c_write_global_declarations_1 (tree globals
)
9600 /* Process the decls in the order they were written. */
9601 for (decl
= globals
; decl
; decl
= DECL_CHAIN (decl
))
9603 /* Check for used but undefined static functions using the C
9604 standard's definition of "used", and set TREE_NO_WARNING so
9605 that check_global_declarations doesn't repeat the check. */
9606 if (TREE_CODE (decl
) == FUNCTION_DECL
9607 && DECL_INITIAL (decl
) == 0
9608 && DECL_EXTERNAL (decl
)
9609 && !TREE_PUBLIC (decl
)
9610 && C_DECL_USED (decl
))
9612 pedwarn (input_location
, 0, "%q+F used but never defined", decl
);
9613 TREE_NO_WARNING (decl
) = 1;
9616 wrapup_global_declaration_1 (decl
);
9622 for (decl
= globals
; decl
; decl
= DECL_CHAIN (decl
))
9623 reconsider
|= wrapup_global_declaration_2 (decl
);
9627 for (decl
= globals
; decl
; decl
= DECL_CHAIN (decl
))
9628 check_global_declaration_1 (decl
);
9631 /* A subroutine of c_write_global_declarations Emit debug information for each
9632 of the declarations in GLOBALS. */
9635 c_write_global_declarations_2 (tree globals
)
9639 for (decl
= globals
; decl
; decl
= DECL_CHAIN (decl
))
9640 debug_hooks
->global_decl (decl
);
9643 /* Callback to collect a source_ref from a DECL. */
9646 collect_source_ref_cb (tree decl
)
9648 if (!DECL_IS_BUILTIN (decl
))
9649 collect_source_ref (LOCATION_FILE (decl_sloc (decl
, false)));
9652 /* Collect all references relevant to SOURCE_FILE. */
9655 collect_all_refs (const char *source_file
)
9660 FOR_EACH_VEC_ELT (tree
, all_translation_units
, i
, t
)
9661 collect_ada_nodes (BLOCK_VARS (DECL_INITIAL (t
)), source_file
);
9664 /* Iterate over all global declarations and call CALLBACK. */
9667 for_each_global_decl (void (*callback
) (tree decl
))
9674 FOR_EACH_VEC_ELT (tree
, all_translation_units
, i
, t
)
9676 decls
= DECL_INITIAL (t
);
9677 for (decl
= BLOCK_VARS (decls
); decl
; decl
= TREE_CHAIN (decl
))
9682 /* Preserve the external declarations scope across a garbage collect. */
9683 static GTY(()) tree ext_block
;
9686 c_write_global_declarations (void)
9691 /* We don't want to do this if generating a PCH. */
9695 /* Close the external scope. */
9696 ext_block
= pop_scope ();
9698 gcc_assert (!current_scope
);
9700 /* Handle -fdump-ada-spec[-slim]. */
9701 if (dump_enabled_p (TDI_ada
))
9703 /* Build a table of files to generate specs for */
9704 if (get_dump_file_info (TDI_ada
)->flags
& TDF_SLIM
)
9705 collect_source_ref (main_input_filename
);
9707 for_each_global_decl (collect_source_ref_cb
);
9709 dump_ada_specs (collect_all_refs
, NULL
);
9714 tree tmp
= BLOCK_VARS (ext_block
);
9716 FILE * stream
= dump_begin (TDI_tu
, &flags
);
9719 dump_node (tmp
, flags
& ~TDF_SLIM
, stream
);
9720 dump_end (TDI_tu
, stream
);
9724 /* Process all file scopes in this compilation, and the external_scope,
9725 through wrapup_global_declarations and check_global_declarations. */
9726 FOR_EACH_VEC_ELT (tree
, all_translation_units
, i
, t
)
9727 c_write_global_declarations_1 (BLOCK_VARS (DECL_INITIAL (t
)));
9728 c_write_global_declarations_1 (BLOCK_VARS (ext_block
));
9730 /* We're done parsing; proceed to optimize and emit assembly.
9731 FIXME: shouldn't be the front end's responsibility to call this. */
9732 cgraph_finalize_compilation_unit ();
9734 /* After cgraph has had a chance to emit everything that's going to
9735 be emitted, output debug information for globals. */
9738 timevar_push (TV_SYMOUT
);
9739 FOR_EACH_VEC_ELT (tree
, all_translation_units
, i
, t
)
9740 c_write_global_declarations_2 (BLOCK_VARS (DECL_INITIAL (t
)));
9741 c_write_global_declarations_2 (BLOCK_VARS (ext_block
));
9742 timevar_pop (TV_SYMOUT
);
9748 /* Register reserved keyword WORD as qualifier for address space AS. */
9751 c_register_addr_space (const char *word
, addr_space_t as
)
9753 int rid
= RID_FIRST_ADDR_SPACE
+ as
;
9756 /* Address space qualifiers are only supported
9757 in C with GNU extensions enabled. */
9758 if (c_dialect_objc () || flag_no_asm
)
9761 id
= get_identifier (word
);
9762 C_SET_RID_CODE (id
, rid
);
9763 C_IS_RESERVED_WORD (id
) = 1;
9764 ridpointers
[rid
] = id
;
9767 #include "gt-c-decl.h"