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, 2011
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-objc.h"
50 #include "c-family/c-upc.h"
51 #include "c-family/c-pragma.h"
53 #include "langhooks.h"
54 #include "tree-mudflap.h"
55 #include "tree-iterator.h"
56 #include "diagnostic-core.h"
57 #include "tree-dump.h"
60 #include "langhooks-def.h"
61 #include "pointer-set.h"
63 #include "c-family/c-ada-spec.h"
65 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
67 { NORMAL
, /* Ordinary declaration */
68 FUNCDEF
, /* Function definition */
69 PARM
, /* Declaration of parm before function body */
70 FIELD
, /* Declaration inside struct or union */
71 TYPENAME
}; /* Typename (inside cast or sizeof) */
73 /* States indicating how grokdeclarator() should handle declspecs marked
74 with __attribute__((deprecated)). An object declared as
75 __attribute__((deprecated)) suppresses warnings of uses of other
78 enum deprecated_states
{
84 /* Nonzero if we have seen an invalid cross reference
85 to a struct, union, or enum, but not yet printed the message. */
86 tree pending_invalid_xref
;
88 /* File and line to appear in the eventual error message. */
89 location_t pending_invalid_xref_location
;
91 /* The file and line that the prototype came from if this is an
92 old-style definition; used for diagnostics in
93 store_parm_decls_oldstyle. */
95 static location_t current_function_prototype_locus
;
97 /* Whether this prototype was built-in. */
99 static bool current_function_prototype_built_in
;
101 /* The argument type information of this prototype. */
103 static tree current_function_prototype_arg_types
;
105 /* The argument information structure for the function currently being
108 static struct c_arg_info
*current_function_arg_info
;
110 /* The obstack on which parser and related data structures, which are
111 not live beyond their top-level declaration or definition, are
113 struct obstack parser_obstack
;
115 /* The current statement tree. */
117 static GTY(()) struct stmt_tree_s c_stmt_tree
;
119 /* State saving variables. */
123 /* A list of decls to be made automatically visible in each file scope. */
124 static GTY(()) tree visible_builtins
;
126 /* Set to 0 at beginning of a function definition, set to 1 if
127 a return statement that specifies a return value is seen. */
129 int current_function_returns_value
;
131 /* Set to 0 at beginning of a function definition, set to 1 if
132 a return statement with no argument is seen. */
134 int current_function_returns_null
;
136 /* Set to 0 at beginning of a function definition, set to 1 if
137 a call to a noreturn function is seen. */
139 int current_function_returns_abnormally
;
141 /* Set to nonzero by `grokdeclarator' for a function
142 whose return type is defaulted, if warnings for this are desired. */
144 static int warn_about_return_type
;
146 /* Nonzero when the current toplevel function contains a declaration
147 of a nested function which is never defined. */
149 static bool undef_nested_function
;
152 /* Each c_binding structure describes one binding of an identifier to
153 a decl. All the decls in a scope - irrespective of namespace - are
154 chained together by the ->prev field, which (as the name implies)
155 runs in reverse order. All the decls in a given namespace bound to
156 a given identifier are chained by the ->shadowed field, which runs
157 from inner to outer scopes.
159 The ->decl field usually points to a DECL node, but there are two
160 exceptions. In the namespace of type tags, the bound entity is a
161 RECORD_TYPE, UNION_TYPE, or ENUMERAL_TYPE node. If an undeclared
162 identifier is encountered, it is bound to error_mark_node to
163 suppress further errors about that identifier in the current
166 The ->u.type field stores the type of the declaration in this scope;
167 if NULL, the type is the type of the ->decl field. This is only of
168 relevance for objects with external or internal linkage which may
169 be redeclared in inner scopes, forming composite types that only
170 persist for the duration of those scopes. In the external scope,
171 this stores the composite of all the types declared for this
172 object, visible or not. The ->inner_comp field (used only at file
173 scope) stores whether an incomplete array type at file scope was
174 completed at an inner scope to an array size other than 1.
176 The ->u.label field is used for labels. It points to a structure
177 which stores additional information used for warnings.
179 The depth field is copied from the scope structure that holds this
180 decl. It is used to preserve the proper ordering of the ->shadowed
181 field (see bind()) and also for a handful of special-case checks.
182 Finally, the invisible bit is true for a decl which should be
183 ignored for purposes of normal name lookup, and the nested bit is
184 true for a decl that's been bound a second time in an inner scope;
185 in all such cases, the binding in the outer scope will have its
186 invisible bit true. */
188 struct GTY((chain_next ("%h.prev"))) c_binding
{
189 union GTY(()) { /* first so GTY desc can use decl */
190 tree
GTY((tag ("0"))) type
; /* the type in this scope */
191 struct c_label_vars
* GTY((tag ("1"))) label
; /* for warnings */
192 } GTY((desc ("TREE_CODE (%0.decl) == LABEL_DECL"))) u
;
193 tree decl
; /* the decl bound */
194 tree id
; /* the identifier it's bound to */
195 struct c_binding
*prev
; /* the previous decl in this scope */
196 struct c_binding
*shadowed
; /* the innermost decl shadowed by this one */
197 unsigned int depth
: 28; /* depth of this scope */
198 BOOL_BITFIELD invisible
: 1; /* normal lookup should ignore this binding */
199 BOOL_BITFIELD nested
: 1; /* do not set DECL_CONTEXT when popping */
200 BOOL_BITFIELD inner_comp
: 1; /* incomplete array completed in inner scope */
201 BOOL_BITFIELD in_struct
: 1; /* currently defined as struct field */
202 location_t locus
; /* location for nested bindings */
204 #define B_IN_SCOPE(b1, b2) ((b1)->depth == (b2)->depth)
205 #define B_IN_CURRENT_SCOPE(b) ((b)->depth == current_scope->depth)
206 #define B_IN_FILE_SCOPE(b) ((b)->depth == 1 /*file_scope->depth*/)
207 #define B_IN_EXTERNAL_SCOPE(b) ((b)->depth == 0 /*external_scope->depth*/)
209 #define I_SYMBOL_BINDING(node) \
210 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->symbol_binding)
211 #define I_SYMBOL_DECL(node) \
212 (I_SYMBOL_BINDING(node) ? I_SYMBOL_BINDING(node)->decl : 0)
214 #define I_TAG_BINDING(node) \
215 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->tag_binding)
216 #define I_TAG_DECL(node) \
217 (I_TAG_BINDING(node) ? I_TAG_BINDING(node)->decl : 0)
219 #define I_LABEL_BINDING(node) \
220 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->label_binding)
221 #define I_LABEL_DECL(node) \
222 (I_LABEL_BINDING(node) ? I_LABEL_BINDING(node)->decl : 0)
224 /* Each C symbol points to three linked lists of c_binding structures.
225 These describe the values of the identifier in the three different
226 namespaces defined by the language. */
228 struct GTY(()) lang_identifier
{
229 struct c_common_identifier common_id
;
230 struct c_binding
*symbol_binding
; /* vars, funcs, constants, typedefs */
231 struct c_binding
*tag_binding
; /* struct/union/enum tags */
232 struct c_binding
*label_binding
; /* labels */
235 /* Validate c-lang.c's assumptions. */
236 extern char C_SIZEOF_STRUCT_LANG_IDENTIFIER_isnt_accurate
237 [(sizeof(struct lang_identifier
) == C_SIZEOF_STRUCT_LANG_IDENTIFIER
) ? 1 : -1];
239 /* The resulting tree type. */
241 union GTY((desc ("TREE_CODE (&%h.generic) == IDENTIFIER_NODE"),
242 chain_next ("(union lang_tree_node *) c_tree_chain_next (&%h.generic)"))) lang_tree_node
244 union tree_node
GTY ((tag ("0"),
245 desc ("tree_node_structure (&%h)")))
247 struct lang_identifier
GTY ((tag ("1"))) identifier
;
250 /* Track bindings and other things that matter for goto warnings. For
251 efficiency, we do not gather all the decls at the point of
252 definition. Instead, we point into the bindings structure. As
253 scopes are popped, we update these structures and gather the decls
254 that matter at that time. */
256 struct GTY(()) c_spot_bindings
{
257 /* The currently open scope which holds bindings defined when the
258 label was defined or the goto statement was found. */
259 struct c_scope
*scope
;
260 /* The bindings in the scope field which were defined at the point
261 of the label or goto. This lets us look at older or newer
262 bindings in the scope, as appropriate. */
263 struct c_binding
*bindings_in_scope
;
264 /* The number of statement expressions that have started since this
265 label or goto statement was defined. This is zero if we are at
266 the same statement expression level. It is positive if we are in
267 a statement expression started since this spot. It is negative
268 if this spot was in a statement expression and we have left
271 /* Whether we started in a statement expression but are no longer in
272 it. This is set to true if stmt_exprs ever goes negative. */
276 /* This structure is used to keep track of bindings seen when a goto
277 statement is defined. This is only used if we see the goto
278 statement before we see the label. */
280 struct GTY(()) c_goto_bindings
{
281 /* The location of the goto statement. */
283 /* The bindings of the goto statement. */
284 struct c_spot_bindings goto_bindings
;
287 typedef struct c_goto_bindings
*c_goto_bindings_p
;
288 DEF_VEC_P(c_goto_bindings_p
);
289 DEF_VEC_ALLOC_P(c_goto_bindings_p
,gc
);
291 /* The additional information we keep track of for a label binding.
292 These fields are updated as scopes are popped. */
294 struct GTY(()) c_label_vars
{
295 /* The shadowed c_label_vars, when one label shadows another (which
296 can only happen using a __label__ declaration). */
297 struct c_label_vars
*shadowed
;
298 /* The bindings when the label was defined. */
299 struct c_spot_bindings label_bindings
;
300 /* A list of decls that we care about: decls about which we should
301 warn if a goto branches to this label from later in the function.
302 Decls are added to this list as scopes are popped. We only add
303 the decls that matter. */
304 VEC(tree
,gc
) *decls_in_scope
;
305 /* A list of goto statements to this label. This is only used for
306 goto statements seen before the label was defined, so that we can
307 issue appropriate warnings for them. */
308 VEC(c_goto_bindings_p
,gc
) *gotos
;
311 /* Each c_scope structure describes the complete contents of one
312 scope. Four scopes are distinguished specially: the innermost or
313 current scope, the innermost function scope, the file scope (always
314 the second to outermost) and the outermost or external scope.
316 Most declarations are recorded in the current scope.
318 All normal label declarations are recorded in the innermost
319 function scope, as are bindings of undeclared identifiers to
320 error_mark_node. (GCC permits nested functions as an extension,
321 hence the 'innermost' qualifier.) Explicitly declared labels
322 (using the __label__ extension) appear in the current scope.
324 Being in the file scope (current_scope == file_scope) causes
325 special behavior in several places below. Also, under some
326 conditions the Objective-C front end records declarations in the
327 file scope even though that isn't the current scope.
329 All declarations with external linkage are recorded in the external
330 scope, even if they aren't visible there; this models the fact that
331 such declarations are visible to the entire program, and (with a
332 bit of cleverness, see pushdecl) allows diagnosis of some violations
333 of C99 6.2.2p7 and 6.2.7p2:
335 If, within the same translation unit, the same identifier appears
336 with both internal and external linkage, the behavior is
339 All declarations that refer to the same object or function shall
340 have compatible type; otherwise, the behavior is undefined.
342 Initially only the built-in declarations, which describe compiler
343 intrinsic functions plus a subset of the standard library, are in
346 The order of the blocks list matters, and it is frequently appended
347 to. To avoid having to walk all the way to the end of the list on
348 each insertion, or reverse the list later, we maintain a pointer to
349 the last list entry. (FIXME: It should be feasible to use a reversed
352 The bindings list is strictly in reverse order of declarations;
353 pop_scope relies on this. */
356 struct GTY((chain_next ("%h.outer"))) c_scope
{
357 /* The scope containing this one. */
358 struct c_scope
*outer
;
360 /* The next outermost function scope. */
361 struct c_scope
*outer_function
;
363 /* All bindings in this scope. */
364 struct c_binding
*bindings
;
366 /* For each scope (except the global one), a chain of BLOCK nodes
367 for all the scopes that were entered and exited one level down. */
371 /* The depth of this scope. Used to keep the ->shadowed chain of
372 bindings sorted innermost to outermost. */
373 unsigned int depth
: 28;
375 /* True if we are currently filling this scope with parameter
377 BOOL_BITFIELD parm_flag
: 1;
379 /* True if we saw [*] in this scope. Used to give an error messages
380 if these appears in a function definition. */
381 BOOL_BITFIELD had_vla_unspec
: 1;
383 /* True if we already complained about forward parameter decls
384 in this scope. This prevents double warnings on
385 foo (int a; int b; ...) */
386 BOOL_BITFIELD warned_forward_parm_decls
: 1;
388 /* True if this is the outermost block scope of a function body.
389 This scope contains the parameters, the local variables declared
390 in the outermost block, and all the labels (except those in
391 nested functions, or declared at block scope with __label__). */
392 BOOL_BITFIELD function_body
: 1;
394 /* True means make a BLOCK for this scope no matter what. */
395 BOOL_BITFIELD keep
: 1;
397 /* True means that an unsuffixed float constant is _Decimal64. */
398 BOOL_BITFIELD float_const_decimal64
: 1;
400 /* True if this scope has any label bindings. This is used to speed
401 up searching for labels when popping scopes, particularly since
402 labels are normally only found at function scope. */
403 BOOL_BITFIELD has_label_bindings
: 1;
405 /* True if we should issue a warning if a goto statement crosses any
406 of the bindings. We still need to check the list of bindings to
407 find the specific ones we need to warn about. This is true if
408 decl_jump_unsafe would return true for any of the bindings. This
409 is used to avoid looping over all the bindings unnecessarily. */
410 BOOL_BITFIELD has_jump_unsafe_decl
: 1;
413 /* The scope currently in effect. */
415 static GTY(()) struct c_scope
*current_scope
;
417 /* The innermost function scope. Ordinary (not explicitly declared)
418 labels, bindings to error_mark_node, and the lazily-created
419 bindings of __func__ and its friends get this scope. */
421 static GTY(()) struct c_scope
*current_function_scope
;
423 /* The C file scope. This is reset for each input translation unit. */
425 static GTY(()) struct c_scope
*file_scope
;
427 /* The outermost scope. This is used for all declarations with
428 external linkage, and only these, hence the name. */
430 static GTY(()) struct c_scope
*external_scope
;
432 /* A chain of c_scope structures awaiting reuse. */
434 static GTY((deletable
)) struct c_scope
*scope_freelist
;
436 /* A chain of c_binding structures awaiting reuse. */
438 static GTY((deletable
)) struct c_binding
*binding_freelist
;
440 /* Append VAR to LIST in scope SCOPE. */
441 #define SCOPE_LIST_APPEND(scope, list, decl) do { \
442 struct c_scope *s_ = (scope); \
444 if (s_->list##_last) \
445 BLOCK_CHAIN (s_->list##_last) = d_; \
448 s_->list##_last = d_; \
451 /* Concatenate FROM in scope FSCOPE onto TO in scope TSCOPE. */
452 #define SCOPE_LIST_CONCAT(tscope, to, fscope, from) do { \
453 struct c_scope *t_ = (tscope); \
454 struct c_scope *f_ = (fscope); \
456 BLOCK_CHAIN (t_->to##_last) = f_->from; \
459 t_->to##_last = f_->from##_last; \
462 /* A c_inline_static structure stores details of a static identifier
463 referenced in a definition of a function that may be an inline
464 definition if no subsequent declaration of that function uses
465 "extern" or does not use "inline". */
467 struct GTY((chain_next ("%h.next"))) c_inline_static
{
468 /* The location for a diagnostic. */
471 /* The function that may be an inline definition. */
474 /* The object or function referenced. */
477 /* What sort of reference this is. */
478 enum c_inline_static_type type
;
480 /* The next such structure or NULL. */
481 struct c_inline_static
*next
;
484 /* List of static identifiers used or referenced in functions that may
485 be inline definitions. */
486 static GTY(()) struct c_inline_static
*c_inline_statics
;
488 /* True means unconditionally make a BLOCK for the next scope pushed. */
490 static bool keep_next_level_flag
;
492 /* True means the next call to push_scope will be the outermost scope
493 of a function body, so do not push a new scope, merely cease
494 expecting parameter decls. */
496 static bool next_is_function_body
;
498 /* A VEC of pointers to c_binding structures. */
500 typedef struct c_binding
*c_binding_ptr
;
501 DEF_VEC_P(c_binding_ptr
);
502 DEF_VEC_ALLOC_P(c_binding_ptr
,heap
);
504 /* Information that we keep for a struct or union while it is being
507 struct c_struct_parse_info
509 /* If warn_cxx_compat, a list of types defined within this
511 VEC(tree
,heap
) *struct_types
;
512 /* If warn_cxx_compat, a list of field names which have bindings,
513 and which are defined in this struct, but which are not defined
514 in any enclosing struct. This is used to clear the in_struct
515 field of the c_bindings structure. */
516 VEC(c_binding_ptr
,heap
) *fields
;
517 /* If warn_cxx_compat, a list of typedef names used when defining
518 fields in this struct. */
519 VEC(tree
,heap
) *typedefs_seen
;
522 /* Information for the struct or union currently being parsed, or
523 NULL if not parsing a struct or union. */
524 static struct c_struct_parse_info
*struct_parse_info
;
526 /* Forward declarations. */
527 static tree
lookup_name_in_scope (tree
, struct c_scope
*);
528 static tree
c_make_fname_decl (location_t
, tree
, int);
529 static tree
grokdeclarator (const struct c_declarator
*,
530 struct c_declspecs
*,
531 enum decl_context
, bool, tree
*, tree
*, tree
*,
532 bool *, enum deprecated_states
);
533 static tree
grokparms (struct c_arg_info
*, bool);
534 static void layout_array_type (tree
);
536 /* T is a statement. Add it to the statement-tree. This is the
537 C/ObjC version--C++ has a slightly different version of this
543 enum tree_code code
= TREE_CODE (t
);
545 if (CAN_HAVE_LOCATION_P (t
) && code
!= LABEL_EXPR
)
547 if (!EXPR_HAS_LOCATION (t
))
548 SET_EXPR_LOCATION (t
, input_location
);
551 if (code
== LABEL_EXPR
|| code
== CASE_LABEL_EXPR
)
552 STATEMENT_LIST_HAS_LABEL (cur_stmt_list
) = 1;
554 /* Add T to the statement-tree. Non-side-effect statements need to be
555 recorded during statement expressions. */
556 if (!building_stmt_list_p ())
558 append_to_statement_list_force (t
, &cur_stmt_list
);
563 /* Return true if we will want to say something if a goto statement
567 decl_jump_unsafe (tree decl
)
569 if (error_operand_p (decl
))
572 /* Always warn about crossing variably modified types. */
573 if ((TREE_CODE (decl
) == VAR_DECL
|| TREE_CODE (decl
) == TYPE_DECL
)
574 && variably_modified_type_p (TREE_TYPE (decl
), NULL_TREE
))
577 /* Otherwise, only warn if -Wgoto-misses-init and this is an
578 initialized automatic decl. */
579 if (warn_jump_misses_init
580 && TREE_CODE (decl
) == VAR_DECL
581 && !TREE_STATIC (decl
)
582 && DECL_INITIAL (decl
) != NULL_TREE
)
590 c_print_identifier (FILE *file
, tree node
, int indent
)
592 print_node (file
, "symbol", I_SYMBOL_DECL (node
), indent
+ 4);
593 print_node (file
, "tag", I_TAG_DECL (node
), indent
+ 4);
594 print_node (file
, "label", I_LABEL_DECL (node
), indent
+ 4);
595 if (C_IS_RESERVED_WORD (node
) && C_RID_CODE (node
) != RID_CXX_COMPAT_WARN
)
597 tree rid
= ridpointers
[C_RID_CODE (node
)];
598 indent_to (file
, indent
+ 4);
599 fprintf (file
, "rid " HOST_PTR_PRINTF
" \"%s\"",
600 (void *) rid
, IDENTIFIER_POINTER (rid
));
604 /* Establish a binding between NAME, an IDENTIFIER_NODE, and DECL,
605 which may be any of several kinds of DECL or TYPE or error_mark_node,
606 in the scope SCOPE. */
608 bind (tree name
, tree decl
, struct c_scope
*scope
, bool invisible
,
609 bool nested
, location_t locus
)
611 struct c_binding
*b
, **here
;
613 if (binding_freelist
)
615 b
= binding_freelist
;
616 binding_freelist
= b
->prev
;
619 b
= ggc_alloc_c_binding ();
624 b
->depth
= scope
->depth
;
625 b
->invisible
= invisible
;
633 b
->prev
= scope
->bindings
;
636 if (decl_jump_unsafe (decl
))
637 scope
->has_jump_unsafe_decl
= 1;
642 switch (TREE_CODE (decl
))
644 case LABEL_DECL
: here
= &I_LABEL_BINDING (name
); break;
647 case RECORD_TYPE
: here
= &I_TAG_BINDING (name
); break;
653 case ERROR_MARK
: here
= &I_SYMBOL_BINDING (name
); break;
659 /* Locate the appropriate place in the chain of shadowed decls
660 to insert this binding. Normally, scope == current_scope and
661 this does nothing. */
662 while (*here
&& (*here
)->depth
> scope
->depth
)
663 here
= &(*here
)->shadowed
;
669 /* Clear the binding structure B, stick it on the binding_freelist,
670 and return the former value of b->prev. This is used by pop_scope
671 and get_parm_info to iterate destructively over all the bindings
672 from a given scope. */
673 static struct c_binding
*
674 free_binding_and_advance (struct c_binding
*b
)
676 struct c_binding
*prev
= b
->prev
;
678 memset (b
, 0, sizeof (struct c_binding
));
679 b
->prev
= binding_freelist
;
680 binding_freelist
= b
;
685 /* Bind a label. Like bind, but skip fields which aren't used for
686 labels, and add the LABEL_VARS value. */
688 bind_label (tree name
, tree label
, struct c_scope
*scope
,
689 struct c_label_vars
*label_vars
)
693 bind (name
, label
, scope
, /*invisible=*/false, /*nested=*/false,
696 scope
->has_label_bindings
= true;
699 gcc_assert (b
->decl
== label
);
700 label_vars
->shadowed
= b
->u
.label
;
701 b
->u
.label
= label_vars
;
704 /* Hook called at end of compilation to assume 1 elt
705 for a file-scope tentative array defn that wasn't complete before. */
708 c_finish_incomplete_decl (tree decl
)
710 if (TREE_CODE (decl
) == VAR_DECL
)
712 tree type
= TREE_TYPE (decl
);
713 if (type
!= error_mark_node
714 && TREE_CODE (type
) == ARRAY_TYPE
715 && !DECL_EXTERNAL (decl
)
716 && TYPE_DOMAIN (type
) == 0)
718 warning_at (DECL_SOURCE_LOCATION (decl
),
719 0, "array %q+D assumed to have one element", decl
);
721 complete_array_type (&TREE_TYPE (decl
), NULL_TREE
, true);
723 layout_decl (decl
, 0);
728 /* Record that inline function FUNC contains a reference (location
729 LOC) to static DECL (file-scope or function-local according to
733 record_inline_static (location_t loc
, tree func
, tree decl
,
734 enum c_inline_static_type type
)
736 struct c_inline_static
*csi
= ggc_alloc_c_inline_static ();
738 csi
->function
= func
;
739 csi
->static_decl
= decl
;
741 csi
->next
= c_inline_statics
;
742 c_inline_statics
= csi
;
745 /* Check for references to static declarations in inline functions at
746 the end of the translation unit and diagnose them if the functions
747 are still inline definitions. */
750 check_inline_statics (void)
752 struct c_inline_static
*csi
;
753 for (csi
= c_inline_statics
; csi
; csi
= csi
->next
)
755 if (DECL_EXTERNAL (csi
->function
))
759 pedwarn (csi
->location
, 0,
760 "%qD is static but used in inline function %qD "
761 "which is not static", csi
->static_decl
, csi
->function
);
764 pedwarn (csi
->location
, 0,
765 "%q+D is static but declared in inline function %qD "
766 "which is not static", csi
->static_decl
, csi
->function
);
772 c_inline_statics
= NULL
;
775 /* Fill in a c_spot_bindings structure. If DEFINING is true, set it
776 for the current state, otherwise set it to uninitialized. */
779 set_spot_bindings (struct c_spot_bindings
*p
, bool defining
)
783 p
->scope
= current_scope
;
784 p
->bindings_in_scope
= current_scope
->bindings
;
789 p
->bindings_in_scope
= NULL
;
792 p
->left_stmt_expr
= false;
795 /* Update spot bindings P as we pop out of SCOPE. Return true if we
796 should push decls for a label. */
799 update_spot_bindings (struct c_scope
*scope
, struct c_spot_bindings
*p
)
801 if (p
->scope
!= scope
)
803 /* This label or goto is defined in some other scope, or it is a
804 label which is not yet defined. There is nothing to
809 /* Adjust the spot bindings to refer to the bindings already defined
810 in the enclosing scope. */
811 p
->scope
= scope
->outer
;
812 p
->bindings_in_scope
= p
->scope
->bindings
;
817 /* The Objective-C front-end often needs to determine the current scope. */
820 objc_get_current_scope (void)
822 return current_scope
;
825 /* The following function is used only by Objective-C. It needs to live here
826 because it accesses the innards of c_scope. */
829 objc_mark_locals_volatile (void *enclosing_blk
)
831 struct c_scope
*scope
;
834 for (scope
= current_scope
;
835 scope
&& scope
!= enclosing_blk
;
836 scope
= scope
->outer
)
838 for (b
= scope
->bindings
; b
; b
= b
->prev
)
839 objc_volatilize_decl (b
->decl
);
841 /* Do not climb up past the current function. */
842 if (scope
->function_body
)
847 /* Return true if we are in the global binding level. */
850 global_bindings_p (void)
852 return current_scope
== file_scope
;
856 keep_next_level (void)
858 keep_next_level_flag
= true;
861 /* Set the flag for the FLOAT_CONST_DECIMAL64 pragma being ON. */
864 set_float_const_decimal64 (void)
866 current_scope
->float_const_decimal64
= true;
869 /* Clear the flag for the FLOAT_CONST_DECIMAL64 pragma. */
872 clear_float_const_decimal64 (void)
874 current_scope
->float_const_decimal64
= false;
877 /* Return nonzero if an unsuffixed float constant is _Decimal64. */
880 float_const_decimal64_p (void)
882 return current_scope
->float_const_decimal64
;
885 /* Identify this scope as currently being filled with parameters. */
888 declare_parm_level (void)
890 current_scope
->parm_flag
= true;
896 if (next_is_function_body
)
898 /* This is the transition from the parameters to the top level
899 of the function body. These are the same scope
900 (C99 6.2.1p4,6) so we do not push another scope structure.
901 next_is_function_body is set only by store_parm_decls, which
902 in turn is called when and only when we are about to
903 encounter the opening curly brace for the function body.
905 The outermost block of a function always gets a BLOCK node,
906 because the debugging output routines expect that each
907 function has at least one BLOCK. */
908 current_scope
->parm_flag
= false;
909 current_scope
->function_body
= true;
910 current_scope
->keep
= true;
911 current_scope
->outer_function
= current_function_scope
;
912 current_function_scope
= current_scope
;
914 keep_next_level_flag
= false;
915 next_is_function_body
= false;
917 /* The FLOAT_CONST_DECIMAL64 pragma applies to nested scopes. */
918 if (current_scope
->outer
)
919 current_scope
->float_const_decimal64
920 = current_scope
->outer
->float_const_decimal64
;
922 current_scope
->float_const_decimal64
= false;
926 struct c_scope
*scope
;
929 scope
= scope_freelist
;
930 scope_freelist
= scope
->outer
;
933 scope
= ggc_alloc_cleared_c_scope ();
935 /* The FLOAT_CONST_DECIMAL64 pragma applies to nested scopes. */
937 scope
->float_const_decimal64
= current_scope
->float_const_decimal64
;
939 scope
->float_const_decimal64
= false;
941 scope
->keep
= keep_next_level_flag
;
942 scope
->outer
= current_scope
;
943 scope
->depth
= current_scope
? (current_scope
->depth
+ 1) : 0;
945 /* Check for scope depth overflow. Unlikely (2^28 == 268,435,456) but
947 if (current_scope
&& scope
->depth
== 0)
950 sorry ("GCC supports only %u nested scopes", scope
->depth
);
953 current_scope
= scope
;
954 keep_next_level_flag
= false;
958 /* This is called when we are leaving SCOPE. For each label defined
959 in SCOPE, add any appropriate decls to its decls_in_scope fields.
960 These are the decls whose initialization will be skipped by a goto
961 later in the function. */
964 update_label_decls (struct c_scope
*scope
)
971 if (s
->has_label_bindings
)
975 for (b
= s
->bindings
; b
!= NULL
; b
= b
->prev
)
977 struct c_label_vars
*label_vars
;
978 struct c_binding
*b1
;
981 struct c_goto_bindings
*g
;
983 if (TREE_CODE (b
->decl
) != LABEL_DECL
)
985 label_vars
= b
->u
.label
;
987 b1
= label_vars
->label_bindings
.bindings_in_scope
;
988 if (label_vars
->label_bindings
.scope
== NULL
)
991 hjud
= label_vars
->label_bindings
.scope
->has_jump_unsafe_decl
;
992 if (update_spot_bindings (scope
, &label_vars
->label_bindings
))
994 /* This label is defined in this scope. */
997 for (; b1
!= NULL
; b1
= b1
->prev
)
999 /* A goto from later in the function to this
1000 label will never see the initialization
1001 of B1, if any. Save it to issue a
1002 warning if needed. */
1003 if (decl_jump_unsafe (b1
->decl
))
1004 VEC_safe_push (tree
, gc
,
1005 label_vars
->decls_in_scope
,
1011 /* Update the bindings of any goto statements associated
1013 FOR_EACH_VEC_ELT (c_goto_bindings_p
, label_vars
->gotos
, ix
, g
)
1014 update_spot_bindings (scope
, &g
->goto_bindings
);
1018 /* Don't search beyond the current function. */
1019 if (s
== current_function_scope
)
1026 /* Set the TYPE_CONTEXT of all of TYPE's variants to CONTEXT. */
1029 set_type_context (tree type
, tree context
)
1031 for (type
= TYPE_MAIN_VARIANT (type
); type
;
1032 type
= TYPE_NEXT_VARIANT (type
))
1033 TYPE_CONTEXT (type
) = context
;
1036 /* Exit a scope. Restore the state of the identifier-decl mappings
1037 that were in effect when this scope was entered. Return a BLOCK
1038 node containing all the DECLs in this scope that are of interest
1039 to debug info generation. */
1044 struct c_scope
*scope
= current_scope
;
1045 tree block
, context
, p
;
1046 struct c_binding
*b
;
1048 bool functionbody
= scope
->function_body
;
1049 bool keep
= functionbody
|| scope
->keep
|| scope
->bindings
;
1051 update_label_decls (scope
);
1053 /* If appropriate, create a BLOCK to record the decls for the life
1054 of this function. */
1058 block
= make_node (BLOCK
);
1059 BLOCK_SUBBLOCKS (block
) = scope
->blocks
;
1060 TREE_USED (block
) = 1;
1062 /* In each subblock, record that this is its superior. */
1063 for (p
= scope
->blocks
; p
; p
= BLOCK_CHAIN (p
))
1064 BLOCK_SUPERCONTEXT (p
) = block
;
1066 BLOCK_VARS (block
) = 0;
1069 /* The TYPE_CONTEXTs for all of the tagged types belonging to this
1070 scope must be set so that they point to the appropriate
1071 construct, i.e. either to the current FUNCTION_DECL node, or
1072 else to the BLOCK node we just constructed.
1074 Note that for tagged types whose scope is just the formal
1075 parameter list for some function type specification, we can't
1076 properly set their TYPE_CONTEXTs here, because we don't have a
1077 pointer to the appropriate FUNCTION_TYPE node readily available
1078 to us. For those cases, the TYPE_CONTEXTs of the relevant tagged
1079 type nodes get set in `grokdeclarator' as soon as we have created
1080 the FUNCTION_TYPE node which will represent the "scope" for these
1081 "parameter list local" tagged types. */
1082 if (scope
->function_body
)
1083 context
= current_function_decl
;
1084 else if (scope
== file_scope
)
1086 tree file_decl
= build_translation_unit_decl (NULL_TREE
);
1087 context
= file_decl
;
1092 /* Clear all bindings in this scope. */
1093 for (b
= scope
->bindings
; b
; b
= free_binding_and_advance (b
))
1096 switch (TREE_CODE (p
))
1099 /* Warnings for unused labels, errors for undefined labels. */
1100 if (TREE_USED (p
) && !DECL_INITIAL (p
))
1102 error ("label %q+D used but not defined", p
);
1103 DECL_INITIAL (p
) = error_mark_node
;
1106 warn_for_unused_label (p
);
1108 /* Labels go in BLOCK_VARS. */
1109 DECL_CHAIN (p
) = BLOCK_VARS (block
);
1110 BLOCK_VARS (block
) = p
;
1111 gcc_assert (I_LABEL_BINDING (b
->id
) == b
);
1112 I_LABEL_BINDING (b
->id
) = b
->shadowed
;
1114 /* Also pop back to the shadowed label_vars. */
1115 release_tree_vector (b
->u
.label
->decls_in_scope
);
1116 b
->u
.label
= b
->u
.label
->shadowed
;
1122 set_type_context (p
, context
);
1124 /* Types may not have tag-names, in which case the type
1125 appears in the bindings list with b->id NULL. */
1128 gcc_assert (I_TAG_BINDING (b
->id
) == b
);
1129 I_TAG_BINDING (b
->id
) = b
->shadowed
;
1134 /* Propagate TREE_ADDRESSABLE from nested functions to their
1135 containing functions. */
1136 if (!TREE_ASM_WRITTEN (p
)
1137 && DECL_INITIAL (p
) != 0
1138 && TREE_ADDRESSABLE (p
)
1139 && DECL_ABSTRACT_ORIGIN (p
) != 0
1140 && DECL_ABSTRACT_ORIGIN (p
) != p
)
1141 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (p
)) = 1;
1142 if (!DECL_EXTERNAL (p
)
1143 && !DECL_INITIAL (p
)
1144 && scope
!= file_scope
1145 && scope
!= external_scope
)
1147 error ("nested function %q+D declared but never defined", p
);
1148 undef_nested_function
= true;
1150 else if (DECL_DECLARED_INLINE_P (p
)
1152 && !DECL_INITIAL (p
))
1154 /* C99 6.7.4p6: "a function with external linkage... declared
1155 with an inline function specifier ... shall also be defined
1156 in the same translation unit." */
1157 if (!flag_gnu89_inline
)
1158 pedwarn (input_location
, 0,
1159 "inline function %q+D declared but never defined", p
);
1160 DECL_EXTERNAL (p
) = 1;
1166 /* Warnings for unused variables. */
1167 if ((!TREE_USED (p
) || !DECL_READ_P (p
))
1168 && !TREE_NO_WARNING (p
)
1169 && !DECL_IN_SYSTEM_HEADER (p
)
1171 && !DECL_ARTIFICIAL (p
)
1172 && scope
!= file_scope
1173 && scope
!= external_scope
)
1176 warning (OPT_Wunused_variable
, "unused variable %q+D", p
);
1177 else if (DECL_CONTEXT (p
) == current_function_decl
)
1178 warning_at (DECL_SOURCE_LOCATION (p
),
1179 OPT_Wunused_but_set_variable
,
1180 "variable %qD set but not used", p
);
1185 error ("type of array %q+D completed incompatibly with"
1186 " implicit initialization", p
);
1193 /* All of these go in BLOCK_VARS, but only if this is the
1194 binding in the home scope. */
1197 DECL_CHAIN (p
) = BLOCK_VARS (block
);
1198 BLOCK_VARS (block
) = p
;
1200 else if (VAR_OR_FUNCTION_DECL_P (p
))
1202 /* For block local externs add a special
1203 DECL_EXTERNAL decl for debug info generation. */
1204 tree extp
= copy_node (p
);
1206 DECL_EXTERNAL (extp
) = 1;
1207 TREE_STATIC (extp
) = 0;
1208 TREE_PUBLIC (extp
) = 1;
1209 DECL_INITIAL (extp
) = NULL_TREE
;
1210 DECL_LANG_SPECIFIC (extp
) = NULL
;
1211 DECL_CONTEXT (extp
) = current_function_decl
;
1212 if (TREE_CODE (p
) == FUNCTION_DECL
)
1214 DECL_RESULT (extp
) = NULL_TREE
;
1215 DECL_SAVED_TREE (extp
) = NULL_TREE
;
1216 DECL_STRUCT_FUNCTION (extp
) = NULL
;
1218 if (b
->locus
!= UNKNOWN_LOCATION
)
1219 DECL_SOURCE_LOCATION (extp
) = b
->locus
;
1220 DECL_CHAIN (extp
) = BLOCK_VARS (block
);
1221 BLOCK_VARS (block
) = extp
;
1223 /* If this is the file scope set DECL_CONTEXT of each decl to
1224 the TRANSLATION_UNIT_DECL. This makes same_translation_unit_p
1226 if (scope
== file_scope
)
1228 DECL_CONTEXT (p
) = context
;
1229 if (TREE_CODE (p
) == TYPE_DECL
1230 && TREE_TYPE (p
) != error_mark_node
)
1231 set_type_context (TREE_TYPE (p
), context
);
1235 /* Parameters go in DECL_ARGUMENTS, not BLOCK_VARS, and have
1236 already been put there by store_parm_decls. Unused-
1237 parameter warnings are handled by function.c.
1238 error_mark_node obviously does not go in BLOCK_VARS and
1239 does not get unused-variable warnings. */
1242 /* It is possible for a decl not to have a name. We get
1243 here with b->id NULL in this case. */
1246 gcc_assert (I_SYMBOL_BINDING (b
->id
) == b
);
1247 I_SYMBOL_BINDING (b
->id
) = b
->shadowed
;
1248 if (b
->shadowed
&& b
->shadowed
->u
.type
)
1249 TREE_TYPE (b
->shadowed
->decl
) = b
->shadowed
->u
.type
;
1259 /* Dispose of the block that we just made inside some higher level. */
1260 if ((scope
->function_body
|| scope
== file_scope
) && context
)
1262 DECL_INITIAL (context
) = block
;
1263 BLOCK_SUPERCONTEXT (block
) = context
;
1265 else if (scope
->outer
)
1268 SCOPE_LIST_APPEND (scope
->outer
, blocks
, block
);
1269 /* If we did not make a block for the scope just exited, any
1270 blocks made for inner scopes must be carried forward so they
1271 will later become subblocks of something else. */
1272 else if (scope
->blocks
)
1273 SCOPE_LIST_CONCAT (scope
->outer
, blocks
, scope
, blocks
);
1276 /* Pop the current scope, and free the structure for reuse. */
1277 current_scope
= scope
->outer
;
1278 if (scope
->function_body
)
1279 current_function_scope
= scope
->outer_function
;
1281 memset (scope
, 0, sizeof (struct c_scope
));
1282 scope
->outer
= scope_freelist
;
1283 scope_freelist
= scope
;
1289 push_file_scope (void)
1297 file_scope
= current_scope
;
1299 start_fname_decls ();
1301 for (decl
= visible_builtins
; decl
; decl
= DECL_CHAIN (decl
))
1302 bind (DECL_NAME (decl
), decl
, file_scope
,
1303 /*invisible=*/false, /*nested=*/true, DECL_SOURCE_LOCATION (decl
));
1307 pop_file_scope (void)
1309 /* In case there were missing closebraces, get us back to the global
1311 while (current_scope
!= file_scope
)
1314 /* __FUNCTION__ is defined at file scope (""). This
1315 call may not be necessary as my tests indicate it
1316 still works without it. */
1317 finish_fname_decls ();
1319 check_inline_statics ();
1321 /* This is the point to write out a PCH if we're doing that.
1322 In that case we do not want to do anything else. */
1325 c_common_write_pch ();
1329 /* Pop off the file scope and close this translation unit. */
1333 maybe_apply_pending_pragma_weaks ();
1336 /* Adjust the bindings for the start of a statement expression. */
1339 c_bindings_start_stmt_expr (struct c_spot_bindings
* switch_bindings
)
1341 struct c_scope
*scope
;
1343 for (scope
= current_scope
; scope
!= NULL
; scope
= scope
->outer
)
1345 struct c_binding
*b
;
1347 if (!scope
->has_label_bindings
)
1350 for (b
= scope
->bindings
; b
!= NULL
; b
= b
->prev
)
1352 struct c_label_vars
*label_vars
;
1354 struct c_goto_bindings
*g
;
1356 if (TREE_CODE (b
->decl
) != LABEL_DECL
)
1358 label_vars
= b
->u
.label
;
1359 ++label_vars
->label_bindings
.stmt_exprs
;
1360 FOR_EACH_VEC_ELT (c_goto_bindings_p
, label_vars
->gotos
, ix
, g
)
1361 ++g
->goto_bindings
.stmt_exprs
;
1365 if (switch_bindings
!= NULL
)
1366 ++switch_bindings
->stmt_exprs
;
1369 /* Adjust the bindings for the end of a statement expression. */
1372 c_bindings_end_stmt_expr (struct c_spot_bindings
*switch_bindings
)
1374 struct c_scope
*scope
;
1376 for (scope
= current_scope
; scope
!= NULL
; scope
= scope
->outer
)
1378 struct c_binding
*b
;
1380 if (!scope
->has_label_bindings
)
1383 for (b
= scope
->bindings
; b
!= NULL
; b
= b
->prev
)
1385 struct c_label_vars
*label_vars
;
1387 struct c_goto_bindings
*g
;
1389 if (TREE_CODE (b
->decl
) != LABEL_DECL
)
1391 label_vars
= b
->u
.label
;
1392 --label_vars
->label_bindings
.stmt_exprs
;
1393 if (label_vars
->label_bindings
.stmt_exprs
< 0)
1395 label_vars
->label_bindings
.left_stmt_expr
= true;
1396 label_vars
->label_bindings
.stmt_exprs
= 0;
1398 FOR_EACH_VEC_ELT (c_goto_bindings_p
, label_vars
->gotos
, ix
, g
)
1400 --g
->goto_bindings
.stmt_exprs
;
1401 if (g
->goto_bindings
.stmt_exprs
< 0)
1403 g
->goto_bindings
.left_stmt_expr
= true;
1404 g
->goto_bindings
.stmt_exprs
= 0;
1410 if (switch_bindings
!= NULL
)
1412 --switch_bindings
->stmt_exprs
;
1413 gcc_assert (switch_bindings
->stmt_exprs
>= 0);
1417 /* Push a definition or a declaration of struct, union or enum tag "name".
1418 "type" should be the type node.
1419 We assume that the tag "name" is not already defined, and has a location
1422 Note that the definition may really be just a forward reference.
1423 In that case, the TYPE_SIZE will be zero. */
1426 pushtag (location_t loc
, tree name
, tree type
)
1428 /* Record the identifier as the type's name if it has none. */
1429 if (name
&& !TYPE_NAME (type
))
1430 TYPE_NAME (type
) = name
;
1431 bind (name
, type
, current_scope
, /*invisible=*/false, /*nested=*/false, loc
);
1433 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1434 tagged type we just added to the current scope. This fake
1435 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1436 to output a representation of a tagged type, and it also gives
1437 us a convenient place to record the "scope start" address for the
1440 TYPE_STUB_DECL (type
) = pushdecl (build_decl (loc
,
1441 TYPE_DECL
, NULL_TREE
, type
));
1443 /* An approximation for now, so we can tell this is a function-scope tag.
1444 This will be updated in pop_scope. */
1445 TYPE_CONTEXT (type
) = DECL_CONTEXT (TYPE_STUB_DECL (type
));
1447 if (warn_cxx_compat
&& name
!= NULL_TREE
)
1449 struct c_binding
*b
= I_SYMBOL_BINDING (name
);
1452 && b
->decl
!= NULL_TREE
1453 && TREE_CODE (b
->decl
) == TYPE_DECL
1454 && (B_IN_CURRENT_SCOPE (b
)
1455 || (current_scope
== file_scope
&& B_IN_EXTERNAL_SCOPE (b
)))
1456 && (TYPE_MAIN_VARIANT (TREE_TYPE (b
->decl
))
1457 != TYPE_MAIN_VARIANT (type
)))
1459 warning_at (loc
, OPT_Wc___compat
,
1460 ("using %qD as both a typedef and a tag is "
1463 if (b
->locus
!= UNKNOWN_LOCATION
)
1464 inform (b
->locus
, "originally defined here");
1469 /* Subroutine of compare_decls. Allow harmless mismatches in return
1470 and argument types provided that the type modes match. This function
1471 return a unified type given a suitable match, and 0 otherwise. */
1474 match_builtin_function_types (tree newtype
, tree oldtype
)
1476 tree newrettype
, oldrettype
;
1477 tree newargs
, oldargs
;
1478 tree trytype
, tryargs
;
1480 /* Accept the return type of the new declaration if same modes. */
1481 oldrettype
= TREE_TYPE (oldtype
);
1482 newrettype
= TREE_TYPE (newtype
);
1484 if (TYPE_MODE (oldrettype
) != TYPE_MODE (newrettype
))
1487 oldargs
= TYPE_ARG_TYPES (oldtype
);
1488 newargs
= TYPE_ARG_TYPES (newtype
);
1491 while (oldargs
|| newargs
)
1495 || !TREE_VALUE (oldargs
)
1496 || !TREE_VALUE (newargs
)
1497 || TYPE_MODE (TREE_VALUE (oldargs
))
1498 != TYPE_MODE (TREE_VALUE (newargs
)))
1501 oldargs
= TREE_CHAIN (oldargs
);
1502 newargs
= TREE_CHAIN (newargs
);
1505 trytype
= build_function_type (newrettype
, tryargs
);
1506 return build_type_attribute_variant (trytype
, TYPE_ATTRIBUTES (oldtype
));
1509 /* Subroutine of diagnose_mismatched_decls. Check for function type
1510 mismatch involving an empty arglist vs a nonempty one and give clearer
1513 diagnose_arglist_conflict (tree newdecl
, tree olddecl
,
1514 tree newtype
, tree oldtype
)
1518 if (TREE_CODE (olddecl
) != FUNCTION_DECL
1519 || !comptypes (TREE_TYPE (oldtype
), TREE_TYPE (newtype
))
1520 || !((!prototype_p (oldtype
) && DECL_INITIAL (olddecl
) == 0)
1521 || (!prototype_p (newtype
) && DECL_INITIAL (newdecl
) == 0)))
1524 t
= TYPE_ARG_TYPES (oldtype
);
1526 t
= TYPE_ARG_TYPES (newtype
);
1527 for (; t
; t
= TREE_CHAIN (t
))
1529 tree type
= TREE_VALUE (t
);
1531 if (TREE_CHAIN (t
) == 0
1532 && TYPE_MAIN_VARIANT (type
) != void_type_node
)
1534 inform (input_location
, "a parameter list with an ellipsis can%'t match "
1535 "an empty parameter name list declaration");
1539 if (c_type_promotes_to (type
) != type
)
1541 inform (input_location
, "an argument type that has a default promotion can%'t match "
1542 "an empty parameter name list declaration");
1548 /* Another subroutine of diagnose_mismatched_decls. OLDDECL is an
1549 old-style function definition, NEWDECL is a prototype declaration.
1550 Diagnose inconsistencies in the argument list. Returns TRUE if
1551 the prototype is compatible, FALSE if not. */
1553 validate_proto_after_old_defn (tree newdecl
, tree newtype
, tree oldtype
)
1555 tree newargs
, oldargs
;
1558 #define END_OF_ARGLIST(t) ((t) == void_type_node)
1560 oldargs
= TYPE_ACTUAL_ARG_TYPES (oldtype
);
1561 newargs
= TYPE_ARG_TYPES (newtype
);
1566 tree oldargtype
= TREE_VALUE (oldargs
);
1567 tree newargtype
= TREE_VALUE (newargs
);
1569 if (oldargtype
== error_mark_node
|| newargtype
== error_mark_node
)
1572 oldargtype
= TYPE_MAIN_VARIANT (oldargtype
);
1573 newargtype
= TYPE_MAIN_VARIANT (newargtype
);
1575 if (END_OF_ARGLIST (oldargtype
) && END_OF_ARGLIST (newargtype
))
1578 /* Reaching the end of just one list means the two decls don't
1579 agree on the number of arguments. */
1580 if (END_OF_ARGLIST (oldargtype
))
1582 error ("prototype for %q+D declares more arguments "
1583 "than previous old-style definition", newdecl
);
1586 else if (END_OF_ARGLIST (newargtype
))
1588 error ("prototype for %q+D declares fewer arguments "
1589 "than previous old-style definition", newdecl
);
1593 /* Type for passing arg must be consistent with that declared
1595 else if (!comptypes (oldargtype
, newargtype
))
1597 error ("prototype for %q+D declares argument %d"
1598 " with incompatible type",
1603 oldargs
= TREE_CHAIN (oldargs
);
1604 newargs
= TREE_CHAIN (newargs
);
1608 /* If we get here, no errors were found, but do issue a warning
1609 for this poor-style construct. */
1610 warning (0, "prototype for %q+D follows non-prototype definition",
1613 #undef END_OF_ARGLIST
1616 /* Subroutine of diagnose_mismatched_decls. Report the location of DECL,
1617 first in a pair of mismatched declarations, using the diagnostic
1620 locate_old_decl (tree decl
)
1622 if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_BUILT_IN (decl
))
1624 else if (DECL_INITIAL (decl
))
1625 inform (input_location
, "previous definition of %q+D was here", decl
);
1626 else if (C_DECL_IMPLICIT (decl
))
1627 inform (input_location
, "previous implicit declaration of %q+D was here", decl
);
1629 inform (input_location
, "previous declaration of %q+D was here", decl
);
1632 /* Subroutine of duplicate_decls. Compare NEWDECL to OLDDECL.
1633 Returns true if the caller should proceed to merge the two, false
1634 if OLDDECL should simply be discarded. As a side effect, issues
1635 all necessary diagnostics for invalid or poor-style combinations.
1636 If it returns true, writes the types of NEWDECL and OLDDECL to
1637 *NEWTYPEP and *OLDTYPEP - these may have been adjusted from
1638 TREE_TYPE (NEWDECL, OLDDECL) respectively. */
1641 diagnose_mismatched_decls (tree newdecl
, tree olddecl
,
1642 tree
*newtypep
, tree
*oldtypep
)
1644 tree newtype
, oldtype
;
1645 bool pedwarned
= false;
1646 bool warned
= false;
1649 #define DECL_EXTERN_INLINE(DECL) (DECL_DECLARED_INLINE_P (DECL) \
1650 && DECL_EXTERNAL (DECL))
1652 /* If we have error_mark_node for either decl or type, just discard
1653 the previous decl - we're in an error cascade already. */
1654 if (olddecl
== error_mark_node
|| newdecl
== error_mark_node
)
1656 *oldtypep
= oldtype
= TREE_TYPE (olddecl
);
1657 *newtypep
= newtype
= TREE_TYPE (newdecl
);
1658 if (oldtype
== error_mark_node
|| newtype
== error_mark_node
)
1661 /* Two different categories of symbol altogether. This is an error
1662 unless OLDDECL is a builtin. OLDDECL will be discarded in any case. */
1663 if (TREE_CODE (olddecl
) != TREE_CODE (newdecl
))
1665 if (!(TREE_CODE (olddecl
) == FUNCTION_DECL
1666 && DECL_BUILT_IN (olddecl
)
1667 && !C_DECL_DECLARED_BUILTIN (olddecl
)))
1669 error ("%q+D redeclared as different kind of symbol", newdecl
);
1670 locate_old_decl (olddecl
);
1672 else if (TREE_PUBLIC (newdecl
))
1673 warning (0, "built-in function %q+D declared as non-function",
1676 warning (OPT_Wshadow
, "declaration of %q+D shadows "
1677 "a built-in function", newdecl
);
1681 /* Enumerators have no linkage, so may only be declared once in a
1683 if (TREE_CODE (olddecl
) == CONST_DECL
)
1685 error ("redeclaration of enumerator %q+D", newdecl
);
1686 locate_old_decl (olddecl
);
1690 if (!comptypes (oldtype
, newtype
))
1692 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1693 && DECL_BUILT_IN (olddecl
) && !C_DECL_DECLARED_BUILTIN (olddecl
))
1695 /* Accept harmless mismatch in function types.
1696 This is for the ffs and fprintf builtins. */
1697 tree trytype
= match_builtin_function_types (newtype
, oldtype
);
1699 if (trytype
&& comptypes (newtype
, trytype
))
1700 *oldtypep
= oldtype
= trytype
;
1703 /* If types don't match for a built-in, throw away the
1704 built-in. No point in calling locate_old_decl here, it
1705 won't print anything. */
1706 warning (0, "conflicting types for built-in function %q+D",
1711 else if (TREE_CODE (olddecl
) == FUNCTION_DECL
1712 && DECL_IS_BUILTIN (olddecl
))
1714 /* A conflicting function declaration for a predeclared
1715 function that isn't actually built in. Objective C uses
1716 these. The new declaration silently overrides everything
1717 but the volatility (i.e. noreturn) indication. See also
1718 below. FIXME: Make Objective C use normal builtins. */
1719 TREE_THIS_VOLATILE (newdecl
) |= TREE_THIS_VOLATILE (olddecl
);
1722 /* Permit void foo (...) to match int foo (...) if the latter is
1723 the definition and implicit int was used. See
1724 c-torture/compile/920625-2.c. */
1725 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
&& DECL_INITIAL (newdecl
)
1726 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype
)) == void_type_node
1727 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype
)) == integer_type_node
1728 && C_FUNCTION_IMPLICIT_INT (newdecl
) && !DECL_INITIAL (olddecl
))
1730 pedwarned
= pedwarn (input_location
, 0,
1731 "conflicting types for %q+D", newdecl
);
1732 /* Make sure we keep void as the return type. */
1733 TREE_TYPE (newdecl
) = *newtypep
= newtype
= oldtype
;
1734 C_FUNCTION_IMPLICIT_INT (newdecl
) = 0;
1736 /* Permit void foo (...) to match an earlier call to foo (...) with
1737 no declared type (thus, implicitly int). */
1738 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
1739 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype
)) == void_type_node
1740 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype
)) == integer_type_node
1741 && C_DECL_IMPLICIT (olddecl
) && !DECL_INITIAL (olddecl
))
1743 pedwarned
= pedwarn (input_location
, 0,
1744 "conflicting types for %q+D", newdecl
);
1745 /* Make sure we keep void as the return type. */
1746 TREE_TYPE (olddecl
) = *oldtypep
= oldtype
= newtype
;
1750 int new_quals
= TYPE_QUALS (newtype
);
1751 int old_quals
= TYPE_QUALS (oldtype
);
1753 if (new_quals
!= old_quals
)
1755 addr_space_t new_addr
= DECODE_QUAL_ADDR_SPACE (new_quals
);
1756 addr_space_t old_addr
= DECODE_QUAL_ADDR_SPACE (old_quals
);
1757 if (new_addr
!= old_addr
)
1759 if (ADDR_SPACE_GENERIC_P (new_addr
))
1760 error ("conflicting named address spaces (generic vs %s) "
1762 c_addr_space_name (old_addr
), newdecl
);
1763 else if (ADDR_SPACE_GENERIC_P (old_addr
))
1764 error ("conflicting named address spaces (%s vs generic) "
1766 c_addr_space_name (new_addr
), newdecl
);
1768 error ("conflicting named address spaces (%s vs %s) "
1770 c_addr_space_name (new_addr
),
1771 c_addr_space_name (old_addr
),
1775 if (CLEAR_QUAL_ADDR_SPACE (new_quals
)
1776 != CLEAR_QUAL_ADDR_SPACE (old_quals
))
1777 error ("conflicting type qualifiers for %q+D", newdecl
);
1780 error ("conflicting types for %q+D", newdecl
);
1781 diagnose_arglist_conflict (newdecl
, olddecl
, newtype
, oldtype
);
1782 locate_old_decl (olddecl
);
1787 /* Redeclaration of a type is a constraint violation (6.7.2.3p1),
1788 but silently ignore the redeclaration if either is in a system
1789 header. (Conflicting redeclarations were handled above.) This
1790 is allowed for C1X if the types are the same, not just
1792 if (TREE_CODE (newdecl
) == TYPE_DECL
)
1794 bool types_different
= false;
1795 int comptypes_result
;
1798 = comptypes_check_different_types (oldtype
, newtype
, &types_different
);
1800 if (comptypes_result
!= 1 || types_different
)
1802 error ("redefinition of typedef %q+D with different type", newdecl
);
1803 locate_old_decl (olddecl
);
1807 if (DECL_IN_SYSTEM_HEADER (newdecl
)
1808 || DECL_IN_SYSTEM_HEADER (olddecl
)
1809 || TREE_NO_WARNING (newdecl
)
1810 || TREE_NO_WARNING (olddecl
))
1811 return true; /* Allow OLDDECL to continue in use. */
1813 if (variably_modified_type_p (newtype
, NULL
))
1815 error ("redefinition of typedef %q+D with variably modified type",
1817 locate_old_decl (olddecl
);
1819 else if (pedantic
&& !flag_isoc1x
)
1821 pedwarn (input_location
, OPT_pedantic
,
1822 "redefinition of typedef %q+D", newdecl
);
1823 locate_old_decl (olddecl
);
1829 /* Function declarations can either be 'static' or 'extern' (no
1830 qualifier is equivalent to 'extern' - C99 6.2.2p5) and therefore
1831 can never conflict with each other on account of linkage
1832 (6.2.2p4). Multiple definitions are not allowed (6.9p3,5) but
1833 gnu89 mode permits two definitions if one is 'extern inline' and
1834 one is not. The non- extern-inline definition supersedes the
1835 extern-inline definition. */
1837 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1839 /* If you declare a built-in function name as static, or
1840 define the built-in with an old-style definition (so we
1841 can't validate the argument list) the built-in definition is
1842 overridden, but optionally warn this was a bad choice of name. */
1843 if (DECL_BUILT_IN (olddecl
)
1844 && !C_DECL_DECLARED_BUILTIN (olddecl
)
1845 && (!TREE_PUBLIC (newdecl
)
1846 || (DECL_INITIAL (newdecl
)
1847 && !prototype_p (TREE_TYPE (newdecl
)))))
1849 warning (OPT_Wshadow
, "declaration of %q+D shadows "
1850 "a built-in function", newdecl
);
1851 /* Discard the old built-in function. */
1855 if (DECL_INITIAL (newdecl
))
1857 if (DECL_INITIAL (olddecl
))
1859 /* If both decls are in the same TU and the new declaration
1860 isn't overriding an extern inline reject the new decl.
1861 In c99, no overriding is allowed in the same translation
1863 if ((!DECL_EXTERN_INLINE (olddecl
)
1864 || DECL_EXTERN_INLINE (newdecl
)
1865 || (!flag_gnu89_inline
1866 && (!DECL_DECLARED_INLINE_P (olddecl
)
1867 || !lookup_attribute ("gnu_inline",
1868 DECL_ATTRIBUTES (olddecl
)))
1869 && (!DECL_DECLARED_INLINE_P (newdecl
)
1870 || !lookup_attribute ("gnu_inline",
1871 DECL_ATTRIBUTES (newdecl
))))
1873 && same_translation_unit_p (newdecl
, olddecl
))
1875 error ("redefinition of %q+D", newdecl
);
1876 locate_old_decl (olddecl
);
1881 /* If we have a prototype after an old-style function definition,
1882 the argument types must be checked specially. */
1883 else if (DECL_INITIAL (olddecl
)
1884 && !prototype_p (oldtype
) && prototype_p (newtype
)
1885 && TYPE_ACTUAL_ARG_TYPES (oldtype
)
1886 && !validate_proto_after_old_defn (newdecl
, newtype
, oldtype
))
1888 locate_old_decl (olddecl
);
1891 /* A non-static declaration (even an "extern") followed by a
1892 static declaration is undefined behavior per C99 6.2.2p3-5,7.
1893 The same is true for a static forward declaration at block
1894 scope followed by a non-static declaration/definition at file
1895 scope. Static followed by non-static at the same scope is
1896 not undefined behavior, and is the most convenient way to get
1897 some effects (see e.g. what unwind-dw2-fde-glibc.c does to
1898 the definition of _Unwind_Find_FDE in unwind-dw2-fde.c), but
1899 we do diagnose it if -Wtraditional. */
1900 if (TREE_PUBLIC (olddecl
) && !TREE_PUBLIC (newdecl
))
1902 /* Two exceptions to the rule. If olddecl is an extern
1903 inline, or a predeclared function that isn't actually
1904 built in, newdecl silently overrides olddecl. The latter
1905 occur only in Objective C; see also above. (FIXME: Make
1906 Objective C use normal builtins.) */
1907 if (!DECL_IS_BUILTIN (olddecl
)
1908 && !DECL_EXTERN_INLINE (olddecl
))
1910 error ("static declaration of %q+D follows "
1911 "non-static declaration", newdecl
);
1912 locate_old_decl (olddecl
);
1916 else if (TREE_PUBLIC (newdecl
) && !TREE_PUBLIC (olddecl
))
1918 if (DECL_CONTEXT (olddecl
))
1920 error ("non-static declaration of %q+D follows "
1921 "static declaration", newdecl
);
1922 locate_old_decl (olddecl
);
1925 else if (warn_traditional
)
1927 warned
|= warning (OPT_Wtraditional
,
1928 "non-static declaration of %q+D "
1929 "follows static declaration", newdecl
);
1933 /* Make sure gnu_inline attribute is either not present, or
1934 present on all inline decls. */
1935 if (DECL_DECLARED_INLINE_P (olddecl
)
1936 && DECL_DECLARED_INLINE_P (newdecl
))
1938 bool newa
= lookup_attribute ("gnu_inline",
1939 DECL_ATTRIBUTES (newdecl
)) != NULL
;
1940 bool olda
= lookup_attribute ("gnu_inline",
1941 DECL_ATTRIBUTES (olddecl
)) != NULL
;
1944 error_at (input_location
, "%<gnu_inline%> attribute present on %q+D",
1945 newa
? newdecl
: olddecl
);
1946 error_at (DECL_SOURCE_LOCATION (newa
? olddecl
: newdecl
),
1951 else if (TREE_CODE (newdecl
) == VAR_DECL
)
1953 /* Only variables can be thread-local, and all declarations must
1954 agree on this property. */
1955 if (C_DECL_THREADPRIVATE_P (olddecl
) && !DECL_THREAD_LOCAL_P (newdecl
))
1957 /* Nothing to check. Since OLDDECL is marked threadprivate
1958 and NEWDECL does not have a thread-local attribute, we
1959 will merge the threadprivate attribute into NEWDECL. */
1962 else if (DECL_THREAD_LOCAL_P (newdecl
) != DECL_THREAD_LOCAL_P (olddecl
))
1964 if (DECL_THREAD_LOCAL_P (newdecl
))
1965 error ("thread-local declaration of %q+D follows "
1966 "non-thread-local declaration", newdecl
);
1968 error ("non-thread-local declaration of %q+D follows "
1969 "thread-local declaration", newdecl
);
1971 locate_old_decl (olddecl
);
1975 /* Multiple initialized definitions are not allowed (6.9p3,5). */
1976 if (DECL_INITIAL (newdecl
) && DECL_INITIAL (olddecl
))
1978 error ("redefinition of %q+D", newdecl
);
1979 locate_old_decl (olddecl
);
1983 /* Objects declared at file scope: if the first declaration had
1984 external linkage (even if it was an external reference) the
1985 second must have external linkage as well, or the behavior is
1986 undefined. If the first declaration had internal linkage, then
1987 the second must too, or else be an external reference (in which
1988 case the composite declaration still has internal linkage).
1989 As for function declarations, we warn about the static-then-
1990 extern case only for -Wtraditional. See generally 6.2.2p3-5,7. */
1991 if (DECL_FILE_SCOPE_P (newdecl
)
1992 && TREE_PUBLIC (newdecl
) != TREE_PUBLIC (olddecl
))
1994 if (DECL_EXTERNAL (newdecl
))
1996 if (!DECL_FILE_SCOPE_P (olddecl
))
1998 error ("extern declaration of %q+D follows "
1999 "declaration with no linkage", newdecl
);
2000 locate_old_decl (olddecl
);
2003 else if (warn_traditional
)
2005 warned
|= warning (OPT_Wtraditional
,
2006 "non-static declaration of %q+D "
2007 "follows static declaration", newdecl
);
2012 if (TREE_PUBLIC (newdecl
))
2013 error ("non-static declaration of %q+D follows "
2014 "static declaration", newdecl
);
2016 error ("static declaration of %q+D follows "
2017 "non-static declaration", newdecl
);
2019 locate_old_decl (olddecl
);
2023 /* Two objects with the same name declared at the same block
2024 scope must both be external references (6.7p3). */
2025 else if (!DECL_FILE_SCOPE_P (newdecl
))
2027 if (DECL_EXTERNAL (newdecl
))
2029 /* Extern with initializer at block scope, which will
2030 already have received an error. */
2032 else if (DECL_EXTERNAL (olddecl
))
2034 error ("declaration of %q+D with no linkage follows "
2035 "extern declaration", newdecl
);
2036 locate_old_decl (olddecl
);
2040 error ("redeclaration of %q+D with no linkage", newdecl
);
2041 locate_old_decl (olddecl
);
2047 /* C++ does not permit a decl to appear multiple times at file
2050 && DECL_FILE_SCOPE_P (newdecl
)
2051 && !DECL_EXTERNAL (newdecl
)
2052 && !DECL_EXTERNAL (olddecl
))
2053 warned
|= warning_at (DECL_SOURCE_LOCATION (newdecl
),
2055 ("duplicate declaration of %qD is "
2061 /* All decls must agree on a visibility. */
2062 if (CODE_CONTAINS_STRUCT (TREE_CODE (newdecl
), TS_DECL_WITH_VIS
)
2063 && DECL_VISIBILITY_SPECIFIED (newdecl
) && DECL_VISIBILITY_SPECIFIED (olddecl
)
2064 && DECL_VISIBILITY (newdecl
) != DECL_VISIBILITY (olddecl
))
2066 warned
|= warning (0, "redeclaration of %q+D with different visibility "
2067 "(old visibility preserved)", newdecl
);
2070 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2072 /* Diagnose inline __attribute__ ((noinline)) which is silly. */
2073 if (DECL_DECLARED_INLINE_P (newdecl
)
2074 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl
)))
2076 warned
|= warning (OPT_Wattributes
,
2077 "inline declaration of %qD follows "
2078 "declaration with attribute noinline", newdecl
);
2080 else if (DECL_DECLARED_INLINE_P (olddecl
)
2081 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl
)))
2083 warned
|= warning (OPT_Wattributes
,
2084 "declaration of %q+D with attribute "
2085 "noinline follows inline declaration ", newdecl
);
2088 else /* PARM_DECL, VAR_DECL */
2090 /* Redeclaration of a parameter is a constraint violation (this is
2091 not explicitly stated, but follows from C99 6.7p3 [no more than
2092 one declaration of the same identifier with no linkage in the
2093 same scope, except type tags] and 6.2.2p6 [parameters have no
2094 linkage]). We must check for a forward parameter declaration,
2095 indicated by TREE_ASM_WRITTEN on the old declaration - this is
2096 an extension, the mandatory diagnostic for which is handled by
2097 mark_forward_parm_decls. */
2099 if (TREE_CODE (newdecl
) == PARM_DECL
2100 && (!TREE_ASM_WRITTEN (olddecl
) || TREE_ASM_WRITTEN (newdecl
)))
2102 error ("redefinition of parameter %q+D", newdecl
);
2103 locate_old_decl (olddecl
);
2108 /* Optional warning for completely redundant decls. */
2109 if (!warned
&& !pedwarned
2110 && warn_redundant_decls
2111 /* Don't warn about a function declaration followed by a
2113 && !(TREE_CODE (newdecl
) == FUNCTION_DECL
2114 && DECL_INITIAL (newdecl
) && !DECL_INITIAL (olddecl
))
2115 /* Don't warn about redundant redeclarations of builtins. */
2116 && !(TREE_CODE (newdecl
) == FUNCTION_DECL
2117 && !DECL_BUILT_IN (newdecl
)
2118 && DECL_BUILT_IN (olddecl
)
2119 && !C_DECL_DECLARED_BUILTIN (olddecl
))
2120 /* Don't warn about an extern followed by a definition. */
2121 && !(DECL_EXTERNAL (olddecl
) && !DECL_EXTERNAL (newdecl
))
2122 /* Don't warn about forward parameter decls. */
2123 && !(TREE_CODE (newdecl
) == PARM_DECL
2124 && TREE_ASM_WRITTEN (olddecl
) && !TREE_ASM_WRITTEN (newdecl
))
2125 /* Don't warn about a variable definition following a declaration. */
2126 && !(TREE_CODE (newdecl
) == VAR_DECL
2127 && DECL_INITIAL (newdecl
) && !DECL_INITIAL (olddecl
)))
2129 warned
= warning (OPT_Wredundant_decls
, "redundant redeclaration of %q+D",
2133 /* Report location of previous decl/defn. */
2134 if (warned
|| pedwarned
)
2135 locate_old_decl (olddecl
);
2137 #undef DECL_EXTERN_INLINE
2142 /* Subroutine of duplicate_decls. NEWDECL has been found to be
2143 consistent with OLDDECL, but carries new information. Merge the
2144 new information into OLDDECL. This function issues no
2148 merge_decls (tree newdecl
, tree olddecl
, tree newtype
, tree oldtype
)
2150 bool new_is_definition
= (TREE_CODE (newdecl
) == FUNCTION_DECL
2151 && DECL_INITIAL (newdecl
) != 0);
2152 bool new_is_prototype
= (TREE_CODE (newdecl
) == FUNCTION_DECL
2153 && prototype_p (TREE_TYPE (newdecl
)));
2154 bool old_is_prototype
= (TREE_CODE (olddecl
) == FUNCTION_DECL
2155 && prototype_p (TREE_TYPE (olddecl
)));
2156 bool extern_changed
= false;
2158 /* For real parm decl following a forward decl, rechain the old decl
2159 in its new location and clear TREE_ASM_WRITTEN (it's not a
2160 forward decl anymore). */
2161 if (TREE_CODE (newdecl
) == PARM_DECL
2162 && TREE_ASM_WRITTEN (olddecl
) && !TREE_ASM_WRITTEN (newdecl
))
2164 struct c_binding
*b
, **here
;
2166 for (here
= ¤t_scope
->bindings
; *here
; here
= &(*here
)->prev
)
2167 if ((*here
)->decl
== olddecl
)
2174 b
->prev
= current_scope
->bindings
;
2175 current_scope
->bindings
= b
;
2177 TREE_ASM_WRITTEN (olddecl
) = 0;
2180 DECL_ATTRIBUTES (newdecl
)
2181 = targetm
.merge_decl_attributes (olddecl
, newdecl
);
2183 /* Merge the data types specified in the two decls. */
2185 = TREE_TYPE (olddecl
)
2186 = composite_type (newtype
, oldtype
);
2188 /* Lay the type out, unless already done. */
2189 if (!comptypes (oldtype
, TREE_TYPE (newdecl
)))
2191 if (TREE_TYPE (newdecl
) != error_mark_node
)
2192 layout_type (TREE_TYPE (newdecl
));
2193 if (TREE_CODE (newdecl
) != FUNCTION_DECL
2194 && TREE_CODE (newdecl
) != TYPE_DECL
2195 && TREE_CODE (newdecl
) != CONST_DECL
)
2196 layout_decl (newdecl
, 0);
2200 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
2201 DECL_SIZE (newdecl
) = DECL_SIZE (olddecl
);
2202 DECL_SIZE_UNIT (newdecl
) = DECL_SIZE_UNIT (olddecl
);
2203 DECL_MODE (newdecl
) = DECL_MODE (olddecl
);
2204 if (DECL_ALIGN (olddecl
) > DECL_ALIGN (newdecl
))
2206 DECL_ALIGN (newdecl
) = DECL_ALIGN (olddecl
);
2207 DECL_USER_ALIGN (newdecl
) |= DECL_USER_ALIGN (olddecl
);
2211 /* Keep the old rtl since we can safely use it. */
2212 if (HAS_RTL_P (olddecl
))
2213 COPY_DECL_RTL (olddecl
, newdecl
);
2215 /* Merge the type qualifiers. */
2216 if (TREE_READONLY (newdecl
))
2217 TREE_READONLY (olddecl
) = 1;
2219 if (TREE_THIS_VOLATILE (newdecl
))
2220 TREE_THIS_VOLATILE (olddecl
) = 1;
2222 if (TREE_SHARED (newdecl
))
2224 TREE_SHARED (olddecl
) = 1;
2225 if (TREE_CODE (newdecl
) == VAR_DECL
)
2226 TREE_THIS_VOLATILE (newdecl
) = 1;
2229 /* Merge deprecatedness. */
2230 if (TREE_DEPRECATED (newdecl
))
2231 TREE_DEPRECATED (olddecl
) = 1;
2233 /* If a decl is in a system header and the other isn't, keep the one on the
2234 system header. Otherwise, keep source location of definition rather than
2235 declaration and of prototype rather than non-prototype unless that
2236 prototype is built-in. */
2237 if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl
), TS_DECL_WITH_VIS
)
2238 && DECL_IN_SYSTEM_HEADER (olddecl
)
2239 && !DECL_IN_SYSTEM_HEADER (newdecl
) )
2240 DECL_SOURCE_LOCATION (newdecl
) = DECL_SOURCE_LOCATION (olddecl
);
2241 else if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl
), TS_DECL_WITH_VIS
)
2242 && DECL_IN_SYSTEM_HEADER (newdecl
)
2243 && !DECL_IN_SYSTEM_HEADER (olddecl
))
2244 DECL_SOURCE_LOCATION (olddecl
) = DECL_SOURCE_LOCATION (newdecl
);
2245 else if ((DECL_INITIAL (newdecl
) == 0 && DECL_INITIAL (olddecl
) != 0)
2246 || (old_is_prototype
&& !new_is_prototype
2247 && !C_DECL_BUILTIN_PROTOTYPE (olddecl
)))
2248 DECL_SOURCE_LOCATION (newdecl
) = DECL_SOURCE_LOCATION (olddecl
);
2250 /* Merge the initialization information. */
2251 if (DECL_INITIAL (newdecl
) == 0)
2252 DECL_INITIAL (newdecl
) = DECL_INITIAL (olddecl
);
2254 /* Merge the threadprivate attribute. */
2255 if (TREE_CODE (olddecl
) == VAR_DECL
&& C_DECL_THREADPRIVATE_P (olddecl
))
2257 DECL_TLS_MODEL (newdecl
) = DECL_TLS_MODEL (olddecl
);
2258 C_DECL_THREADPRIVATE_P (newdecl
) = 1;
2261 if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl
), TS_DECL_WITH_VIS
))
2263 /* Merge the section attribute.
2264 We want to issue an error if the sections conflict but that
2265 must be done later in decl_attributes since we are called
2266 before attributes are assigned. */
2267 if (DECL_SECTION_NAME (newdecl
) == NULL_TREE
)
2268 DECL_SECTION_NAME (newdecl
) = DECL_SECTION_NAME (olddecl
);
2270 /* Copy the assembler name.
2271 Currently, it can only be defined in the prototype. */
2272 COPY_DECL_ASSEMBLER_NAME (olddecl
, newdecl
);
2274 /* Use visibility of whichever declaration had it specified */
2275 if (DECL_VISIBILITY_SPECIFIED (olddecl
))
2277 DECL_VISIBILITY (newdecl
) = DECL_VISIBILITY (olddecl
);
2278 DECL_VISIBILITY_SPECIFIED (newdecl
) = 1;
2281 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2283 DECL_STATIC_CONSTRUCTOR(newdecl
) |= DECL_STATIC_CONSTRUCTOR(olddecl
);
2284 DECL_STATIC_DESTRUCTOR (newdecl
) |= DECL_STATIC_DESTRUCTOR (olddecl
);
2285 DECL_NO_LIMIT_STACK (newdecl
) |= DECL_NO_LIMIT_STACK (olddecl
);
2286 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl
)
2287 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl
);
2288 TREE_THIS_VOLATILE (newdecl
) |= TREE_THIS_VOLATILE (olddecl
);
2289 DECL_IS_MALLOC (newdecl
) |= DECL_IS_MALLOC (olddecl
);
2290 DECL_IS_OPERATOR_NEW (newdecl
) |= DECL_IS_OPERATOR_NEW (olddecl
);
2291 TREE_READONLY (newdecl
) |= TREE_READONLY (olddecl
);
2292 DECL_PURE_P (newdecl
) |= DECL_PURE_P (olddecl
);
2293 DECL_IS_NOVOPS (newdecl
) |= DECL_IS_NOVOPS (olddecl
);
2296 /* Merge the storage class information. */
2297 merge_weak (newdecl
, olddecl
);
2299 /* For functions, static overrides non-static. */
2300 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2302 TREE_PUBLIC (newdecl
) &= TREE_PUBLIC (olddecl
);
2303 /* This is since we don't automatically
2304 copy the attributes of NEWDECL into OLDDECL. */
2305 TREE_PUBLIC (olddecl
) = TREE_PUBLIC (newdecl
);
2306 /* If this clears `static', clear it in the identifier too. */
2307 if (!TREE_PUBLIC (olddecl
))
2308 TREE_PUBLIC (DECL_NAME (olddecl
)) = 0;
2312 /* In c99, 'extern' declaration before (or after) 'inline' means this
2313 function is not DECL_EXTERNAL, unless 'gnu_inline' attribute
2315 if (TREE_CODE (newdecl
) == FUNCTION_DECL
2316 && !flag_gnu89_inline
2317 && (DECL_DECLARED_INLINE_P (newdecl
)
2318 || DECL_DECLARED_INLINE_P (olddecl
))
2319 && (!DECL_DECLARED_INLINE_P (newdecl
)
2320 || !DECL_DECLARED_INLINE_P (olddecl
)
2321 || !DECL_EXTERNAL (olddecl
))
2322 && DECL_EXTERNAL (newdecl
)
2323 && !lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (newdecl
))
2324 && !current_function_decl
)
2325 DECL_EXTERNAL (newdecl
) = 0;
2327 if (DECL_EXTERNAL (newdecl
))
2329 TREE_STATIC (newdecl
) = TREE_STATIC (olddecl
);
2330 DECL_EXTERNAL (newdecl
) = DECL_EXTERNAL (olddecl
);
2332 /* An extern decl does not override previous storage class. */
2333 TREE_PUBLIC (newdecl
) = TREE_PUBLIC (olddecl
);
2334 if (!DECL_EXTERNAL (newdecl
))
2336 DECL_CONTEXT (newdecl
) = DECL_CONTEXT (olddecl
);
2337 DECL_COMMON (newdecl
) = DECL_COMMON (olddecl
);
2342 TREE_STATIC (olddecl
) = TREE_STATIC (newdecl
);
2343 TREE_PUBLIC (olddecl
) = TREE_PUBLIC (newdecl
);
2346 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2348 /* If we're redefining a function previously defined as extern
2349 inline, make sure we emit debug info for the inline before we
2350 throw it away, in case it was inlined into a function that
2351 hasn't been written out yet. */
2352 if (new_is_definition
&& DECL_INITIAL (olddecl
))
2353 /* The new defn must not be inline. */
2354 DECL_UNINLINABLE (newdecl
) = 1;
2357 /* If either decl says `inline', this fn is inline, unless
2358 its definition was passed already. */
2359 if (DECL_DECLARED_INLINE_P (newdecl
)
2360 || DECL_DECLARED_INLINE_P (olddecl
))
2361 DECL_DECLARED_INLINE_P (newdecl
) = 1;
2363 DECL_UNINLINABLE (newdecl
) = DECL_UNINLINABLE (olddecl
)
2364 = (DECL_UNINLINABLE (newdecl
) || DECL_UNINLINABLE (olddecl
));
2366 DECL_DISREGARD_INLINE_LIMITS (newdecl
)
2367 = DECL_DISREGARD_INLINE_LIMITS (olddecl
)
2368 = (DECL_DISREGARD_INLINE_LIMITS (newdecl
)
2369 || DECL_DISREGARD_INLINE_LIMITS (olddecl
));
2372 if (DECL_BUILT_IN (olddecl
))
2374 /* If redeclaring a builtin function, it stays built in.
2375 But it gets tagged as having been declared. */
2376 DECL_BUILT_IN_CLASS (newdecl
) = DECL_BUILT_IN_CLASS (olddecl
);
2377 DECL_FUNCTION_CODE (newdecl
) = DECL_FUNCTION_CODE (olddecl
);
2378 C_DECL_DECLARED_BUILTIN (newdecl
) = 1;
2379 if (new_is_prototype
)
2380 C_DECL_BUILTIN_PROTOTYPE (newdecl
) = 0;
2382 C_DECL_BUILTIN_PROTOTYPE (newdecl
)
2383 = C_DECL_BUILTIN_PROTOTYPE (olddecl
);
2386 /* Preserve function specific target and optimization options */
2387 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl
)
2388 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl
))
2389 DECL_FUNCTION_SPECIFIC_TARGET (newdecl
)
2390 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl
);
2392 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl
)
2393 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl
))
2394 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl
)
2395 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl
);
2397 /* Also preserve various other info from the definition. */
2398 if (!new_is_definition
)
2401 DECL_RESULT (newdecl
) = DECL_RESULT (olddecl
);
2402 DECL_INITIAL (newdecl
) = DECL_INITIAL (olddecl
);
2403 DECL_STRUCT_FUNCTION (newdecl
) = DECL_STRUCT_FUNCTION (olddecl
);
2404 DECL_SAVED_TREE (newdecl
) = DECL_SAVED_TREE (olddecl
);
2405 DECL_ARGUMENTS (newdecl
) = copy_list (DECL_ARGUMENTS (olddecl
));
2406 for (t
= DECL_ARGUMENTS (newdecl
); t
; t
= DECL_CHAIN (t
))
2407 DECL_CONTEXT (t
) = newdecl
;
2409 /* See if we've got a function to instantiate from. */
2410 if (DECL_SAVED_TREE (olddecl
))
2411 DECL_ABSTRACT_ORIGIN (newdecl
)
2412 = DECL_ABSTRACT_ORIGIN (olddecl
);
2416 extern_changed
= DECL_EXTERNAL (olddecl
) && !DECL_EXTERNAL (newdecl
);
2418 /* Merge the USED information. */
2419 if (TREE_USED (olddecl
))
2420 TREE_USED (newdecl
) = 1;
2421 else if (TREE_USED (newdecl
))
2422 TREE_USED (olddecl
) = 1;
2423 if (TREE_CODE (olddecl
) == VAR_DECL
|| TREE_CODE (olddecl
) == PARM_DECL
)
2424 DECL_READ_P (newdecl
) |= DECL_READ_P (olddecl
);
2425 if (DECL_PRESERVE_P (olddecl
))
2426 DECL_PRESERVE_P (newdecl
) = 1;
2427 else if (DECL_PRESERVE_P (newdecl
))
2428 DECL_PRESERVE_P (olddecl
) = 1;
2430 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
2431 But preserve OLDDECL's DECL_UID, DECL_CONTEXT and
2432 DECL_ARGUMENTS (if appropriate). */
2434 unsigned olddecl_uid
= DECL_UID (olddecl
);
2435 tree olddecl_context
= DECL_CONTEXT (olddecl
);
2436 tree olddecl_arguments
= NULL
;
2437 if (TREE_CODE (olddecl
) == FUNCTION_DECL
)
2438 olddecl_arguments
= DECL_ARGUMENTS (olddecl
);
2440 memcpy ((char *) olddecl
+ sizeof (struct tree_common
),
2441 (char *) newdecl
+ sizeof (struct tree_common
),
2442 sizeof (struct tree_decl_common
) - sizeof (struct tree_common
));
2443 switch (TREE_CODE (olddecl
))
2453 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
2454 (char *) newdecl
+ sizeof (struct tree_decl_common
),
2455 tree_code_size (TREE_CODE (olddecl
)) - sizeof (struct tree_decl_common
));
2460 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
2461 (char *) newdecl
+ sizeof (struct tree_decl_common
),
2462 sizeof (struct tree_decl_non_common
) - sizeof (struct tree_decl_common
));
2464 DECL_UID (olddecl
) = olddecl_uid
;
2465 DECL_CONTEXT (olddecl
) = olddecl_context
;
2466 if (TREE_CODE (olddecl
) == FUNCTION_DECL
)
2467 DECL_ARGUMENTS (olddecl
) = olddecl_arguments
;
2470 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2471 so that encode_section_info has a chance to look at the new decl
2472 flags and attributes. */
2473 if (DECL_RTL_SET_P (olddecl
)
2474 && (TREE_CODE (olddecl
) == FUNCTION_DECL
2475 || (TREE_CODE (olddecl
) == VAR_DECL
2476 && TREE_STATIC (olddecl
))))
2477 make_decl_rtl (olddecl
);
2479 /* If we changed a function from DECL_EXTERNAL to !DECL_EXTERNAL,
2480 and the definition is coming from the old version, cgraph needs
2481 to be called again. */
2482 if (extern_changed
&& !new_is_definition
2483 && TREE_CODE (olddecl
) == FUNCTION_DECL
&& DECL_INITIAL (olddecl
))
2484 cgraph_mark_if_needed (olddecl
);
2487 /* Handle when a new declaration NEWDECL has the same name as an old
2488 one OLDDECL in the same binding contour. Prints an error message
2491 If safely possible, alter OLDDECL to look like NEWDECL, and return
2492 true. Otherwise, return false. */
2495 duplicate_decls (tree newdecl
, tree olddecl
)
2497 tree newtype
= NULL
, oldtype
= NULL
;
2499 if (!diagnose_mismatched_decls (newdecl
, olddecl
, &newtype
, &oldtype
))
2501 /* Avoid `unused variable' and other warnings for OLDDECL. */
2502 TREE_NO_WARNING (olddecl
) = 1;
2506 merge_decls (newdecl
, olddecl
, newtype
, oldtype
);
2511 /* Check whether decl-node NEW_DECL shadows an existing declaration. */
2513 warn_if_shadowing (tree new_decl
)
2515 struct c_binding
*b
;
2517 /* Shadow warnings wanted? */
2519 /* No shadow warnings for internally generated vars. */
2520 || DECL_IS_BUILTIN (new_decl
)
2521 /* No shadow warnings for vars made for inlining. */
2522 || DECL_FROM_INLINE (new_decl
))
2525 /* Is anything being shadowed? Invisible decls do not count. */
2526 for (b
= I_SYMBOL_BINDING (DECL_NAME (new_decl
)); b
; b
= b
->shadowed
)
2527 if (b
->decl
&& b
->decl
!= new_decl
&& !b
->invisible
)
2529 tree old_decl
= b
->decl
;
2531 if (old_decl
== error_mark_node
)
2533 warning (OPT_Wshadow
, "declaration of %q+D shadows previous "
2534 "non-variable", new_decl
);
2537 else if (TREE_CODE (old_decl
) == PARM_DECL
)
2538 warning (OPT_Wshadow
, "declaration of %q+D shadows a parameter",
2540 else if (DECL_FILE_SCOPE_P (old_decl
))
2541 warning (OPT_Wshadow
, "declaration of %q+D shadows a global "
2542 "declaration", new_decl
);
2543 else if (TREE_CODE (old_decl
) == FUNCTION_DECL
2544 && DECL_BUILT_IN (old_decl
))
2546 warning (OPT_Wshadow
, "declaration of %q+D shadows "
2547 "a built-in function", new_decl
);
2551 warning (OPT_Wshadow
, "declaration of %q+D shadows a previous local",
2554 warning_at (DECL_SOURCE_LOCATION (old_decl
), OPT_Wshadow
,
2555 "shadowed declaration is here");
2561 /* Record a decl-node X as belonging to the current lexical scope.
2562 Check for errors (such as an incompatible declaration for the same
2563 name already seen in the same scope).
2565 Returns either X or an old decl for the same name.
2566 If an old decl is returned, it may have been smashed
2567 to agree with what X says. */
2572 tree name
= DECL_NAME (x
);
2573 struct c_scope
*scope
= current_scope
;
2574 struct c_binding
*b
;
2575 bool nested
= false;
2576 location_t locus
= DECL_SOURCE_LOCATION (x
);
2578 /* Must set DECL_CONTEXT for everything not at file scope or
2579 DECL_FILE_SCOPE_P won't work. Local externs don't count
2580 unless they have initializers (which generate code). */
2581 if (current_function_decl
2582 && ((TREE_CODE (x
) != FUNCTION_DECL
&& TREE_CODE (x
) != VAR_DECL
)
2583 || DECL_INITIAL (x
) || !DECL_EXTERNAL (x
)))
2584 DECL_CONTEXT (x
) = current_function_decl
;
2586 /* Anonymous decls are just inserted in the scope. */
2589 bind (name
, x
, scope
, /*invisible=*/false, /*nested=*/false,
2594 /* First, see if there is another declaration with the same name in
2595 the current scope. If there is, duplicate_decls may do all the
2596 work for us. If duplicate_decls returns false, that indicates
2597 two incompatible decls in the same scope; we are to silently
2598 replace the old one (duplicate_decls has issued all appropriate
2599 diagnostics). In particular, we should not consider possible
2600 duplicates in the external scope, or shadowing. */
2601 b
= I_SYMBOL_BINDING (name
);
2602 if (b
&& B_IN_SCOPE (b
, scope
))
2604 struct c_binding
*b_ext
, *b_use
;
2605 tree type
= TREE_TYPE (x
);
2606 tree visdecl
= b
->decl
;
2607 tree vistype
= TREE_TYPE (visdecl
);
2608 if (TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
2609 && COMPLETE_TYPE_P (TREE_TYPE (x
)))
2610 b
->inner_comp
= false;
2613 /* If this is an external linkage declaration, we should check
2614 for compatibility with the type in the external scope before
2615 setting the type at this scope based on the visible
2616 information only. */
2617 if (TREE_PUBLIC (x
) && TREE_PUBLIC (visdecl
))
2619 while (b_ext
&& !B_IN_EXTERNAL_SCOPE (b_ext
))
2620 b_ext
= b_ext
->shadowed
;
2625 TREE_TYPE (b_use
->decl
) = b_use
->u
.type
;
2628 if (duplicate_decls (x
, b_use
->decl
))
2632 /* Save the updated type in the external scope and
2633 restore the proper type for this scope. */
2635 if (comptypes (vistype
, type
))
2636 thistype
= composite_type (vistype
, type
);
2638 thistype
= TREE_TYPE (b_use
->decl
);
2639 b_use
->u
.type
= TREE_TYPE (b_use
->decl
);
2640 if (TREE_CODE (b_use
->decl
) == FUNCTION_DECL
2641 && DECL_BUILT_IN (b_use
->decl
))
2643 = build_type_attribute_variant (thistype
,
2646 TREE_TYPE (b_use
->decl
) = thistype
;
2651 goto skip_external_and_shadow_checks
;
2654 /* All declarations with external linkage, and all external
2655 references, go in the external scope, no matter what scope is
2656 current. However, the binding in that scope is ignored for
2657 purposes of normal name lookup. A separate binding structure is
2658 created in the requested scope; this governs the normal
2659 visibility of the symbol.
2661 The binding in the externals scope is used exclusively for
2662 detecting duplicate declarations of the same object, no matter
2663 what scope they are in; this is what we do here. (C99 6.2.7p2:
2664 All declarations that refer to the same object or function shall
2665 have compatible type; otherwise, the behavior is undefined.) */
2666 if (DECL_EXTERNAL (x
) || scope
== file_scope
)
2668 tree type
= TREE_TYPE (x
);
2671 bool type_saved
= false;
2672 if (b
&& !B_IN_EXTERNAL_SCOPE (b
)
2673 && (TREE_CODE (b
->decl
) == FUNCTION_DECL
2674 || TREE_CODE (b
->decl
) == VAR_DECL
)
2675 && DECL_FILE_SCOPE_P (b
->decl
))
2678 vistype
= TREE_TYPE (visdecl
);
2680 if (scope
!= file_scope
2681 && !DECL_IN_SYSTEM_HEADER (x
))
2682 warning (OPT_Wnested_externs
, "nested extern declaration of %qD", x
);
2684 while (b
&& !B_IN_EXTERNAL_SCOPE (b
))
2686 /* If this decl might be modified, save its type. This is
2687 done here rather than when the decl is first bound
2688 because the type may change after first binding, through
2689 being completed or through attributes being added. If we
2690 encounter multiple such decls, only the first should have
2691 its type saved; the others will already have had their
2692 proper types saved and the types will not have changed as
2693 their scopes will not have been re-entered. */
2694 if (DECL_P (b
->decl
) && DECL_FILE_SCOPE_P (b
->decl
) && !type_saved
)
2696 b
->u
.type
= TREE_TYPE (b
->decl
);
2699 if (B_IN_FILE_SCOPE (b
)
2700 && TREE_CODE (b
->decl
) == VAR_DECL
2701 && TREE_STATIC (b
->decl
)
2702 && TREE_CODE (TREE_TYPE (b
->decl
)) == ARRAY_TYPE
2703 && !TYPE_DOMAIN (TREE_TYPE (b
->decl
))
2704 && TREE_CODE (type
) == ARRAY_TYPE
2705 && TYPE_DOMAIN (type
)
2706 && TYPE_MAX_VALUE (TYPE_DOMAIN (type
))
2707 && !integer_zerop (TYPE_MAX_VALUE (TYPE_DOMAIN (type
))))
2709 /* Array type completed in inner scope, which should be
2710 diagnosed if the completion does not have size 1 and
2711 it does not get completed in the file scope. */
2712 b
->inner_comp
= true;
2717 /* If a matching external declaration has been found, set its
2718 type to the composite of all the types of that declaration.
2719 After the consistency checks, it will be reset to the
2720 composite of the visible types only. */
2721 if (b
&& (TREE_PUBLIC (x
) || same_translation_unit_p (x
, b
->decl
))
2723 TREE_TYPE (b
->decl
) = b
->u
.type
;
2725 /* The point of the same_translation_unit_p check here is,
2726 we want to detect a duplicate decl for a construct like
2727 foo() { extern bar(); } ... static bar(); but not if
2728 they are in different translation units. In any case,
2729 the static does not go in the externals scope. */
2731 && (TREE_PUBLIC (x
) || same_translation_unit_p (x
, b
->decl
))
2732 && duplicate_decls (x
, b
->decl
))
2737 if (comptypes (vistype
, type
))
2738 thistype
= composite_type (vistype
, type
);
2740 thistype
= TREE_TYPE (b
->decl
);
2744 b
->u
.type
= TREE_TYPE (b
->decl
);
2745 if (TREE_CODE (b
->decl
) == FUNCTION_DECL
&& DECL_BUILT_IN (b
->decl
))
2747 = build_type_attribute_variant (thistype
,
2748 TYPE_ATTRIBUTES (b
->u
.type
));
2749 TREE_TYPE (b
->decl
) = thistype
;
2750 bind (name
, b
->decl
, scope
, /*invisible=*/false, /*nested=*/true,
2754 else if (TREE_PUBLIC (x
))
2756 if (visdecl
&& !b
&& duplicate_decls (x
, visdecl
))
2758 /* An external declaration at block scope referring to a
2759 visible entity with internal linkage. The composite
2760 type will already be correct for this scope, so we
2761 just need to fall through to make the declaration in
2768 bind (name
, x
, external_scope
, /*invisible=*/true,
2769 /*nested=*/false, locus
);
2775 if (TREE_CODE (x
) != PARM_DECL
)
2776 warn_if_shadowing (x
);
2778 skip_external_and_shadow_checks
:
2779 if (TREE_CODE (x
) == TYPE_DECL
)
2781 /* So this is a typedef, set its underlying type. */
2782 set_underlying_type (x
);
2784 /* If X is a typedef defined in the current function, record it
2785 for the purpose of implementing the -Wunused-local-typedefs
2787 record_locally_defined_typedef (x
);
2790 bind (name
, x
, scope
, /*invisible=*/false, nested
, locus
);
2792 /* If x's type is incomplete because it's based on a
2793 structure or union which has not yet been fully declared,
2794 attach it to that structure or union type, so we can go
2795 back and complete the variable declaration later, if the
2796 structure or union gets fully declared.
2798 If the input is erroneous, we can have error_mark in the type
2799 slot (e.g. "f(void a, ...)") - that doesn't count as an
2801 if (TREE_TYPE (x
) != error_mark_node
2802 && !COMPLETE_TYPE_P (TREE_TYPE (x
)))
2804 tree element
= TREE_TYPE (x
);
2806 while (TREE_CODE (element
) == ARRAY_TYPE
)
2807 element
= TREE_TYPE (element
);
2808 element
= TYPE_MAIN_VARIANT (element
);
2810 if ((TREE_CODE (element
) == RECORD_TYPE
2811 || TREE_CODE (element
) == UNION_TYPE
)
2812 && (TREE_CODE (x
) != TYPE_DECL
2813 || TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
)
2814 && !COMPLETE_TYPE_P (element
))
2815 C_TYPE_INCOMPLETE_VARS (element
)
2816 = tree_cons (NULL_TREE
, x
, C_TYPE_INCOMPLETE_VARS (element
));
2821 /* Record X as belonging to file scope.
2822 This is used only internally by the Objective-C front end,
2823 and is limited to its needs. duplicate_decls is not called;
2824 if there is any preexisting decl for this identifier, it is an ICE. */
2827 pushdecl_top_level (tree x
)
2830 bool nested
= false;
2831 gcc_assert (TREE_CODE (x
) == VAR_DECL
|| TREE_CODE (x
) == CONST_DECL
);
2833 name
= DECL_NAME (x
);
2835 gcc_assert (TREE_CODE (x
) == CONST_DECL
|| !I_SYMBOL_BINDING (name
));
2837 if (TREE_PUBLIC (x
))
2839 bind (name
, x
, external_scope
, /*invisible=*/true, /*nested=*/false,
2844 bind (name
, x
, file_scope
, /*invisible=*/false, nested
, UNKNOWN_LOCATION
);
2850 implicit_decl_warning (tree id
, tree olddecl
)
2852 if (upc_diagnose_deprecated_stmt (input_location
, id
))
2854 if (warn_implicit_function_declaration
)
2859 warned
= pedwarn (input_location
, OPT_Wimplicit_function_declaration
,
2860 "implicit declaration of function %qE", id
);
2862 warned
= warning (OPT_Wimplicit_function_declaration
,
2863 G_("implicit declaration of function %qE"), id
);
2864 if (olddecl
&& warned
)
2865 locate_old_decl (olddecl
);
2869 /* Generate an implicit declaration for identifier FUNCTIONID at LOC as a
2870 function of type int (). */
2873 implicitly_declare (location_t loc
, tree functionid
)
2875 struct c_binding
*b
;
2879 for (b
= I_SYMBOL_BINDING (functionid
); b
; b
= b
->shadowed
)
2881 if (B_IN_SCOPE (b
, external_scope
))
2890 if (decl
== error_mark_node
)
2893 /* FIXME: Objective-C has weird not-really-builtin functions
2894 which are supposed to be visible automatically. They wind up
2895 in the external scope because they're pushed before the file
2896 scope gets created. Catch this here and rebind them into the
2898 if (!DECL_BUILT_IN (decl
) && DECL_IS_BUILTIN (decl
))
2900 bind (functionid
, decl
, file_scope
,
2901 /*invisible=*/false, /*nested=*/true,
2902 DECL_SOURCE_LOCATION (decl
));
2907 tree newtype
= default_function_type
;
2909 TREE_TYPE (decl
) = b
->u
.type
;
2910 /* Implicit declaration of a function already declared
2911 (somehow) in a different scope, or as a built-in.
2912 If this is the first time this has happened, warn;
2913 then recycle the old declaration but with the new type. */
2914 if (!C_DECL_IMPLICIT (decl
))
2916 implicit_decl_warning (functionid
, decl
);
2917 C_DECL_IMPLICIT (decl
) = 1;
2919 if (DECL_BUILT_IN (decl
))
2921 newtype
= build_type_attribute_variant (newtype
,
2923 (TREE_TYPE (decl
)));
2924 if (!comptypes (newtype
, TREE_TYPE (decl
)))
2926 warning_at (loc
, 0, "incompatible implicit declaration of "
2927 "built-in function %qD", decl
);
2928 newtype
= TREE_TYPE (decl
);
2933 if (!comptypes (newtype
, TREE_TYPE (decl
)))
2935 error_at (loc
, "incompatible implicit declaration of function %qD", decl
);
2936 locate_old_decl (decl
);
2939 b
->u
.type
= TREE_TYPE (decl
);
2940 TREE_TYPE (decl
) = newtype
;
2941 bind (functionid
, decl
, current_scope
,
2942 /*invisible=*/false, /*nested=*/true,
2943 DECL_SOURCE_LOCATION (decl
));
2948 /* Not seen before. */
2949 decl
= build_decl (loc
, FUNCTION_DECL
, functionid
, default_function_type
);
2950 DECL_EXTERNAL (decl
) = 1;
2951 TREE_PUBLIC (decl
) = 1;
2952 C_DECL_IMPLICIT (decl
) = 1;
2953 implicit_decl_warning (functionid
, 0);
2954 asmspec_tree
= maybe_apply_renaming_pragma (decl
, /*asmname=*/NULL
);
2956 set_user_assembler_name (decl
, TREE_STRING_POINTER (asmspec_tree
));
2958 /* C89 says implicit declarations are in the innermost block.
2959 So we record the decl in the standard fashion. */
2960 decl
= pushdecl (decl
);
2962 /* No need to call objc_check_decl here - it's a function type. */
2963 rest_of_decl_compilation (decl
, 0, 0);
2965 /* Write a record describing this implicit function declaration
2966 to the prototypes file (if requested). */
2967 gen_aux_info_record (decl
, 0, 1, 0);
2969 /* Possibly apply some default attributes to this implicit declaration. */
2970 decl_attributes (&decl
, NULL_TREE
, 0);
2975 /* Issue an error message for a reference to an undeclared variable
2976 ID, including a reference to a builtin outside of function-call
2977 context. Establish a binding of the identifier to error_mark_node
2978 in an appropriate scope, which will suppress further errors for the
2979 same identifier. The error message should be given location LOC. */
2981 undeclared_variable (location_t loc
, tree id
)
2983 static bool already
= false;
2984 struct c_scope
*scope
;
2986 if (current_function_decl
== 0)
2988 error_at (loc
, "%qE undeclared here (not in a function)", id
);
2989 scope
= current_scope
;
2993 if (upc_diagnose_deprecated_stmt (loc
, id
))
2995 if (!objc_diagnose_private_ivar (id
))
2996 error_at (loc
, "%qE undeclared (first use in this function)", id
);
2999 inform (loc
, "each undeclared identifier is reported only"
3000 " once for each function it appears in");
3004 /* If we are parsing old-style parameter decls, current_function_decl
3005 will be nonnull but current_function_scope will be null. */
3006 scope
= current_function_scope
? current_function_scope
: current_scope
;
3008 bind (id
, error_mark_node
, scope
, /*invisible=*/false, /*nested=*/false,
3012 /* Subroutine of lookup_label, declare_label, define_label: construct a
3013 LABEL_DECL with all the proper frills. Also create a struct
3014 c_label_vars initialized for the current scope. */
3017 make_label (location_t location
, tree name
, bool defining
,
3018 struct c_label_vars
**p_label_vars
)
3020 tree label
= build_decl (location
, LABEL_DECL
, name
, void_type_node
);
3021 struct c_label_vars
*label_vars
;
3023 DECL_CONTEXT (label
) = current_function_decl
;
3024 DECL_MODE (label
) = VOIDmode
;
3026 label_vars
= ggc_alloc_c_label_vars ();
3027 label_vars
->shadowed
= NULL
;
3028 set_spot_bindings (&label_vars
->label_bindings
, defining
);
3029 label_vars
->decls_in_scope
= make_tree_vector ();
3030 label_vars
->gotos
= VEC_alloc (c_goto_bindings_p
, gc
, 0);
3031 *p_label_vars
= label_vars
;
3036 /* Get the LABEL_DECL corresponding to identifier NAME as a label.
3037 Create one if none exists so far for the current function.
3038 This is called when a label is used in a goto expression or
3039 has its address taken. */
3042 lookup_label (tree name
)
3045 struct c_label_vars
*label_vars
;
3047 if (current_function_scope
== 0)
3049 error ("label %qE referenced outside of any function", name
);
3053 /* Use a label already defined or ref'd with this name, but not if
3054 it is inherited from a containing function and wasn't declared
3056 label
= I_LABEL_DECL (name
);
3057 if (label
&& (DECL_CONTEXT (label
) == current_function_decl
3058 || C_DECLARED_LABEL_FLAG (label
)))
3060 /* If the label has only been declared, update its apparent
3061 location to point here, for better diagnostics if it
3062 turns out not to have been defined. */
3063 if (DECL_INITIAL (label
) == NULL_TREE
)
3064 DECL_SOURCE_LOCATION (label
) = input_location
;
3068 /* No label binding for that identifier; make one. */
3069 label
= make_label (input_location
, name
, false, &label_vars
);
3071 /* Ordinary labels go in the current function scope. */
3072 bind_label (name
, label
, current_function_scope
, label_vars
);
3077 /* Issue a warning about DECL for a goto statement at GOTO_LOC going
3081 warn_about_goto (location_t goto_loc
, tree label
, tree decl
)
3083 if (variably_modified_type_p (TREE_TYPE (decl
), NULL_TREE
))
3085 "jump into scope of identifier with variably modified type");
3087 warning_at (goto_loc
, OPT_Wjump_misses_init
,
3088 "jump skips variable initialization");
3089 inform (DECL_SOURCE_LOCATION (label
), "label %qD defined here", label
);
3090 inform (DECL_SOURCE_LOCATION (decl
), "%qD declared here", decl
);
3093 /* Look up a label because of a goto statement. This is like
3094 lookup_label, but also issues any appropriate warnings. */
3097 lookup_label_for_goto (location_t loc
, tree name
)
3100 struct c_label_vars
*label_vars
;
3104 label
= lookup_label (name
);
3105 if (label
== NULL_TREE
)
3108 /* If we are jumping to a different function, we can't issue any
3110 if (DECL_CONTEXT (label
) != current_function_decl
)
3112 gcc_assert (C_DECLARED_LABEL_FLAG (label
));
3116 label_vars
= I_LABEL_BINDING (name
)->u
.label
;
3118 /* If the label has not yet been defined, then push this goto on a
3119 list for possible later warnings. */
3120 if (label_vars
->label_bindings
.scope
== NULL
)
3122 struct c_goto_bindings
*g
;
3124 g
= ggc_alloc_c_goto_bindings ();
3126 set_spot_bindings (&g
->goto_bindings
, true);
3127 VEC_safe_push (c_goto_bindings_p
, gc
, label_vars
->gotos
, g
);
3131 /* If there are any decls in label_vars->decls_in_scope, then this
3132 goto has missed the declaration of the decl. This happens for a
3138 Issue a warning or error. */
3139 FOR_EACH_VEC_ELT (tree
, label_vars
->decls_in_scope
, ix
, decl
)
3140 warn_about_goto (loc
, label
, decl
);
3142 if (label_vars
->label_bindings
.left_stmt_expr
)
3144 error_at (loc
, "jump into statement expression");
3145 inform (DECL_SOURCE_LOCATION (label
), "label %qD defined here", label
);
3151 /* Make a label named NAME in the current function, shadowing silently
3152 any that may be inherited from containing functions or containing
3153 scopes. This is called for __label__ declarations. */
3156 declare_label (tree name
)
3158 struct c_binding
*b
= I_LABEL_BINDING (name
);
3160 struct c_label_vars
*label_vars
;
3162 /* Check to make sure that the label hasn't already been declared
3164 if (b
&& B_IN_CURRENT_SCOPE (b
))
3166 error ("duplicate label declaration %qE", name
);
3167 locate_old_decl (b
->decl
);
3169 /* Just use the previous declaration. */
3173 label
= make_label (input_location
, name
, false, &label_vars
);
3174 C_DECLARED_LABEL_FLAG (label
) = 1;
3176 /* Declared labels go in the current scope. */
3177 bind_label (name
, label
, current_scope
, label_vars
);
3182 /* When we define a label, issue any appropriate warnings if there are
3183 any gotos earlier in the function which jump to this label. */
3186 check_earlier_gotos (tree label
, struct c_label_vars
* label_vars
)
3189 struct c_goto_bindings
*g
;
3191 FOR_EACH_VEC_ELT (c_goto_bindings_p
, label_vars
->gotos
, ix
, g
)
3193 struct c_binding
*b
;
3194 struct c_scope
*scope
;
3196 /* We have a goto to this label. The goto is going forward. In
3197 g->scope, the goto is going to skip any binding which was
3198 defined after g->bindings_in_scope. */
3199 if (g
->goto_bindings
.scope
->has_jump_unsafe_decl
)
3201 for (b
= g
->goto_bindings
.scope
->bindings
;
3202 b
!= g
->goto_bindings
.bindings_in_scope
;
3205 if (decl_jump_unsafe (b
->decl
))
3206 warn_about_goto (g
->loc
, label
, b
->decl
);
3210 /* We also need to warn about decls defined in any scopes
3211 between the scope of the label and the scope of the goto. */
3212 for (scope
= label_vars
->label_bindings
.scope
;
3213 scope
!= g
->goto_bindings
.scope
;
3214 scope
= scope
->outer
)
3216 gcc_assert (scope
!= NULL
);
3217 if (scope
->has_jump_unsafe_decl
)
3219 if (scope
== label_vars
->label_bindings
.scope
)
3220 b
= label_vars
->label_bindings
.bindings_in_scope
;
3222 b
= scope
->bindings
;
3223 for (; b
!= NULL
; b
= b
->prev
)
3225 if (decl_jump_unsafe (b
->decl
))
3226 warn_about_goto (g
->loc
, label
, b
->decl
);
3231 if (g
->goto_bindings
.stmt_exprs
> 0)
3233 error_at (g
->loc
, "jump into statement expression");
3234 inform (DECL_SOURCE_LOCATION (label
), "label %qD defined here",
3239 /* Now that the label is defined, we will issue warnings about
3240 subsequent gotos to this label when we see them. */
3241 VEC_truncate (c_goto_bindings_p
, label_vars
->gotos
, 0);
3242 label_vars
->gotos
= NULL
;
3245 /* Define a label, specifying the location in the source file.
3246 Return the LABEL_DECL node for the label, if the definition is valid.
3247 Otherwise return 0. */
3250 define_label (location_t location
, tree name
)
3252 /* Find any preexisting label with this name. It is an error
3253 if that label has already been defined in this function, or
3254 if there is a containing function with a declared label with
3256 tree label
= I_LABEL_DECL (name
);
3259 && ((DECL_CONTEXT (label
) == current_function_decl
3260 && DECL_INITIAL (label
) != 0)
3261 || (DECL_CONTEXT (label
) != current_function_decl
3262 && C_DECLARED_LABEL_FLAG (label
))))
3264 error_at (location
, "duplicate label %qD", label
);
3265 locate_old_decl (label
);
3268 else if (label
&& DECL_CONTEXT (label
) == current_function_decl
)
3270 struct c_label_vars
*label_vars
= I_LABEL_BINDING (name
)->u
.label
;
3272 /* The label has been used or declared already in this function,
3273 but not defined. Update its location to point to this
3275 DECL_SOURCE_LOCATION (label
) = location
;
3276 set_spot_bindings (&label_vars
->label_bindings
, true);
3278 /* Issue warnings as required about any goto statements from
3279 earlier in the function. */
3280 check_earlier_gotos (label
, label_vars
);
3284 struct c_label_vars
*label_vars
;
3286 /* No label binding for that identifier; make one. */
3287 label
= make_label (location
, name
, true, &label_vars
);
3289 /* Ordinary labels go in the current function scope. */
3290 bind_label (name
, label
, current_function_scope
, label_vars
);
3293 if (!in_system_header
&& lookup_name (name
))
3294 warning_at (location
, OPT_Wtraditional
,
3295 "traditional C lacks a separate namespace "
3296 "for labels, identifier %qE conflicts", name
);
3298 /* Mark label as having been defined. */
3299 DECL_INITIAL (label
) = error_mark_node
;
3303 /* Get the bindings for a new switch statement. This is used to issue
3304 warnings as appropriate for jumps from the switch to case or
3307 struct c_spot_bindings
*
3308 c_get_switch_bindings (void)
3310 struct c_spot_bindings
*switch_bindings
;
3312 switch_bindings
= XNEW (struct c_spot_bindings
);
3313 set_spot_bindings (switch_bindings
, true);
3314 return switch_bindings
;
3318 c_release_switch_bindings (struct c_spot_bindings
*bindings
)
3320 gcc_assert (bindings
->stmt_exprs
== 0 && !bindings
->left_stmt_expr
);
3324 /* This is called at the point of a case or default label to issue
3325 warnings about decls as needed. It returns true if it found an
3326 error, not just a warning. */
3329 c_check_switch_jump_warnings (struct c_spot_bindings
*switch_bindings
,
3330 location_t switch_loc
, location_t case_loc
)
3333 struct c_scope
*scope
;
3336 for (scope
= current_scope
;
3337 scope
!= switch_bindings
->scope
;
3338 scope
= scope
->outer
)
3340 struct c_binding
*b
;
3342 gcc_assert (scope
!= NULL
);
3344 if (!scope
->has_jump_unsafe_decl
)
3347 for (b
= scope
->bindings
; b
!= NULL
; b
= b
->prev
)
3349 if (decl_jump_unsafe (b
->decl
))
3351 if (variably_modified_type_p (TREE_TYPE (b
->decl
), NULL_TREE
))
3355 ("switch jumps into scope of identifier with "
3356 "variably modified type"));
3359 warning_at (case_loc
, OPT_Wjump_misses_init
,
3360 "switch jumps over variable initialization");
3361 inform (switch_loc
, "switch starts here");
3362 inform (DECL_SOURCE_LOCATION (b
->decl
), "%qD declared here",
3368 if (switch_bindings
->stmt_exprs
> 0)
3371 error_at (case_loc
, "switch jumps into statement expression");
3372 inform (switch_loc
, "switch starts here");
3378 /* Given NAME, an IDENTIFIER_NODE,
3379 return the structure (or union or enum) definition for that name.
3380 If THISLEVEL_ONLY is nonzero, searches only the current_scope.
3381 CODE says which kind of type the caller wants;
3382 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
3383 If PLOC is not NULL and this returns non-null, it sets *PLOC to the
3384 location where the tag was defined.
3385 If the wrong kind of type is found, an error is reported. */
3388 lookup_tag (enum tree_code code
, tree name
, int thislevel_only
,
3391 struct c_binding
*b
= I_TAG_BINDING (name
);
3397 /* We only care about whether it's in this level if
3398 thislevel_only was set or it might be a type clash. */
3399 if (thislevel_only
|| TREE_CODE (b
->decl
) != code
)
3401 /* For our purposes, a tag in the external scope is the same as
3402 a tag in the file scope. (Primarily relevant to Objective-C
3403 and its builtin structure tags, which get pushed before the
3404 file scope is created.) */
3405 if (B_IN_CURRENT_SCOPE (b
)
3406 || (current_scope
== file_scope
&& B_IN_EXTERNAL_SCOPE (b
)))
3410 if (thislevel_only
&& !thislevel
)
3413 if (TREE_CODE (b
->decl
) != code
)
3415 /* Definition isn't the kind we were looking for. */
3416 pending_invalid_xref
= name
;
3417 pending_invalid_xref_location
= input_location
;
3419 /* If in the same binding level as a declaration as a tag
3420 of a different type, this must not be allowed to
3421 shadow that tag, so give the error immediately.
3422 (For example, "struct foo; union foo;" is invalid.) */
3424 pending_xref_error ();
3433 /* Print an error message now
3434 for a recent invalid struct, union or enum cross reference.
3435 We don't print them immediately because they are not invalid
3436 when used in the `struct foo;' construct for shadowing. */
3439 pending_xref_error (void)
3441 if (pending_invalid_xref
!= 0)
3442 error_at (pending_invalid_xref_location
, "%qE defined as wrong kind of tag",
3443 pending_invalid_xref
);
3444 pending_invalid_xref
= 0;
3448 /* Look up NAME in the current scope and its superiors
3449 in the namespace of variables, functions and typedefs.
3450 Return a ..._DECL node of some kind representing its definition,
3451 or return 0 if it is undefined. */
3454 lookup_name (tree name
)
3456 struct c_binding
*b
= I_SYMBOL_BINDING (name
);
3457 if (b
&& !b
->invisible
)
3459 maybe_record_typedef_use (b
->decl
);
3465 /* Similar to `lookup_name' but look only at the indicated scope. */
3468 lookup_name_in_scope (tree name
, struct c_scope
*scope
)
3470 struct c_binding
*b
;
3472 for (b
= I_SYMBOL_BINDING (name
); b
; b
= b
->shadowed
)
3473 if (B_IN_SCOPE (b
, scope
))
3478 /* Create the predefined scalar types of C,
3479 and some nodes representing standard constants (0, 1, (void *) 0).
3480 Initialize the global scope.
3481 Make definitions for built-in primitive functions. */
3484 c_init_decl_processing (void)
3486 location_t save_loc
= input_location
;
3488 /* Initialize reserved words for parser. */
3491 current_function_decl
= 0;
3493 gcc_obstack_init (&parser_obstack
);
3495 /* Make the externals scope. */
3497 external_scope
= current_scope
;
3499 /* Declarations from c_common_nodes_and_builtins must not be associated
3500 with this input file, lest we get differences between using and not
3501 using preprocessed headers. */
3502 input_location
= BUILTINS_LOCATION
;
3504 c_common_nodes_and_builtins ();
3506 /* In C, comparisons and TRUTH_* expressions have type int. */
3507 truthvalue_type_node
= integer_type_node
;
3508 truthvalue_true_node
= integer_one_node
;
3509 truthvalue_false_node
= integer_zero_node
;
3511 /* Even in C99, which has a real boolean type. */
3512 pushdecl (build_decl (UNKNOWN_LOCATION
, TYPE_DECL
, get_identifier ("_Bool"),
3513 boolean_type_node
));
3515 input_location
= save_loc
;
3517 pedantic_lvalues
= true;
3519 make_fname_decl
= c_make_fname_decl
;
3520 start_fname_decls ();
3523 /* Create the VAR_DECL at LOC for __FUNCTION__ etc. ID is the name to
3524 give the decl, NAME is the initialization string and TYPE_DEP
3525 indicates whether NAME depended on the type of the function. As we
3526 don't yet implement delayed emission of static data, we mark the
3527 decl as emitted so it is not placed in the output. Anything using
3528 it must therefore pull out the STRING_CST initializer directly.
3532 c_make_fname_decl (location_t loc
, tree id
, int type_dep
)
3534 const char *name
= fname_as_string (type_dep
);
3535 tree decl
, type
, init
;
3536 size_t length
= strlen (name
);
3538 type
= build_array_type (char_type_node
,
3539 build_index_type (size_int (length
)));
3540 type
= c_build_qualified_type (type
, TYPE_QUAL_CONST
);
3542 decl
= build_decl (loc
, VAR_DECL
, id
, type
);
3544 TREE_STATIC (decl
) = 1;
3545 TREE_READONLY (decl
) = 1;
3546 DECL_ARTIFICIAL (decl
) = 1;
3548 init
= build_string (length
+ 1, name
);
3549 free (CONST_CAST (char *, name
));
3550 TREE_TYPE (init
) = type
;
3551 DECL_INITIAL (decl
) = init
;
3553 TREE_USED (decl
) = 1;
3555 if (current_function_decl
3556 /* For invalid programs like this:
3559 const char* p = __FUNCTION__;
3561 the __FUNCTION__ is believed to appear in K&R style function
3562 parameter declarator. In that case we still don't have
3564 && (!seen_error () || current_function_scope
))
3566 DECL_CONTEXT (decl
) = current_function_decl
;
3567 bind (id
, decl
, current_function_scope
,
3568 /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION
);
3571 finish_decl (decl
, loc
, init
, NULL_TREE
, NULL_TREE
);
3577 c_builtin_function (tree decl
)
3579 tree type
= TREE_TYPE (decl
);
3580 tree id
= DECL_NAME (decl
);
3582 const char *name
= IDENTIFIER_POINTER (id
);
3583 C_DECL_BUILTIN_PROTOTYPE (decl
) = prototype_p (type
);
3585 /* Should never be called on a symbol with a preexisting meaning. */
3586 gcc_assert (!I_SYMBOL_BINDING (id
));
3588 bind (id
, decl
, external_scope
, /*invisible=*/true, /*nested=*/false,
3591 /* Builtins in the implementation namespace are made visible without
3592 needing to be explicitly declared. See push_file_scope. */
3593 if (name
[0] == '_' && (name
[1] == '_' || ISUPPER (name
[1])))
3595 DECL_CHAIN (decl
) = visible_builtins
;
3596 visible_builtins
= decl
;
3603 c_builtin_function_ext_scope (tree decl
)
3605 tree type
= TREE_TYPE (decl
);
3606 tree id
= DECL_NAME (decl
);
3608 const char *name
= IDENTIFIER_POINTER (id
);
3609 C_DECL_BUILTIN_PROTOTYPE (decl
) = prototype_p (type
);
3611 /* Should never be called on a symbol with a preexisting meaning. */
3612 gcc_assert (!I_SYMBOL_BINDING (id
));
3614 bind (id
, decl
, external_scope
, /*invisible=*/false, /*nested=*/false,
3617 /* Builtins in the implementation namespace are made visible without
3618 needing to be explicitly declared. See push_file_scope. */
3619 if (name
[0] == '_' && (name
[1] == '_' || ISUPPER (name
[1])))
3621 DECL_CHAIN (decl
) = visible_builtins
;
3622 visible_builtins
= decl
;
3628 /* Called when a declaration is seen that contains no names to declare.
3629 If its type is a reference to a structure, union or enum inherited
3630 from a containing scope, shadow that tag name for the current scope
3631 with a forward reference.
3632 If its type defines a new named structure or union
3633 or defines an enum, it is valid but we need not do anything here.
3634 Otherwise, it is an error. */
3637 shadow_tag (const struct c_declspecs
*declspecs
)
3639 shadow_tag_warned (declspecs
, 0);
3642 /* WARNED is 1 if we have done a pedwarn, 2 if we have done a warning,
3645 shadow_tag_warned (const struct c_declspecs
*declspecs
, int warned
)
3647 bool found_tag
= false;
3649 if (declspecs
->type
&& !declspecs
->default_int_p
&& !declspecs
->typedef_p
)
3651 tree value
= declspecs
->type
;
3652 enum tree_code code
= TREE_CODE (value
);
3654 if (code
== RECORD_TYPE
|| code
== UNION_TYPE
|| code
== ENUMERAL_TYPE
)
3655 /* Used to test also that TYPE_SIZE (value) != 0.
3656 That caused warning for `struct foo;' at top level in the file. */
3658 tree name
= TYPE_NAME (value
);
3663 if (declspecs
->restrict_p
)
3665 error ("invalid use of %<restrict%>");
3671 if (warned
!= 1 && code
!= ENUMERAL_TYPE
)
3672 /* Empty unnamed enum OK */
3674 pedwarn (input_location
, 0,
3675 "unnamed struct/union that defines no instances");
3679 else if (declspecs
->typespec_kind
!= ctsk_tagdef
3680 && declspecs
->typespec_kind
!= ctsk_tagfirstref
3681 && declspecs
->storage_class
!= csc_none
)
3684 pedwarn (input_location
, 0,
3685 "empty declaration with storage class specifier "
3686 "does not redeclare tag");
3688 pending_xref_error ();
3690 else if (declspecs
->typespec_kind
!= ctsk_tagdef
3691 && declspecs
->typespec_kind
!= ctsk_tagfirstref
3692 && (declspecs
->const_p
3693 || declspecs
->volatile_p
3694 || declspecs
->restrict_p
3695 || declspecs
->address_space
))
3698 pedwarn (input_location
, 0,
3699 "empty declaration with type qualifier "
3700 "does not redeclare tag");
3702 pending_xref_error ();
3706 pending_invalid_xref
= 0;
3707 t
= lookup_tag (code
, name
, 1, NULL
);
3711 t
= make_node (code
);
3712 pushtag (input_location
, name
, t
);
3718 if (warned
!= 1 && !in_system_header
)
3720 pedwarn (input_location
, 0,
3721 "useless type name in empty declaration");
3726 else if (warned
!= 1 && !in_system_header
&& declspecs
->typedef_p
)
3728 pedwarn (input_location
, 0, "useless type name in empty declaration");
3732 pending_invalid_xref
= 0;
3734 if (declspecs
->inline_p
)
3736 error ("%<inline%> in empty declaration");
3740 if (declspecs
->noreturn_p
)
3742 error ("%<_Noreturn%> in empty declaration");
3746 if (current_scope
== file_scope
&& declspecs
->storage_class
== csc_auto
)
3748 error ("%<auto%> in file-scope empty declaration");
3752 if (current_scope
== file_scope
&& declspecs
->storage_class
== csc_register
)
3754 error ("%<register%> in file-scope empty declaration");
3758 if (!warned
&& !in_system_header
&& declspecs
->storage_class
!= csc_none
)
3760 warning (0, "useless storage class specifier in empty declaration");
3764 if (!warned
&& !in_system_header
&& declspecs
->thread_p
)
3766 warning (0, "useless %<__thread%> in empty declaration");
3770 if (!warned
&& !in_system_header
&& (declspecs
->const_p
3771 || declspecs
->volatile_p
3772 || declspecs
->restrict_p
3773 || declspecs
->address_space
))
3775 warning (0, "useless type qualifier in empty declaration");
3782 pedwarn (input_location
, 0, "empty declaration");
3787 /* Return the qualifiers from SPECS as a bitwise OR of TYPE_QUAL_*
3788 bits. SPECS represents declaration specifiers that the grammar
3789 only permits to contain type qualifiers and attributes. */
3792 quals_from_declspecs (const struct c_declspecs
*specs
)
3794 int quals
= ((specs
->const_p
? TYPE_QUAL_CONST
: 0)
3795 | (specs
->volatile_p
? TYPE_QUAL_VOLATILE
: 0)
3796 | (specs
->restrict_p
? TYPE_QUAL_RESTRICT
: 0)
3797 | (specs
->shared_p
? TYPE_QUAL_SHARED
: 0)
3798 | (specs
->strict_p
? TYPE_QUAL_STRICT
: 0)
3799 | (specs
->relaxed_p
? TYPE_QUAL_RELAXED
: 0)
3800 | (ENCODE_QUAL_ADDR_SPACE (specs
->address_space
)));
3801 gcc_assert (!specs
->type
3802 && !specs
->decl_attr
3803 && specs
->typespec_word
== cts_none
3804 && specs
->storage_class
== csc_none
3805 && !specs
->typedef_p
3806 && !specs
->explicit_signed_p
3807 && !specs
->deprecated_p
3809 && !specs
->long_long_p
3812 && !specs
->unsigned_p
3813 && !specs
->complex_p
3815 && !specs
->noreturn_p
3816 && !specs
->thread_p
);
3820 /* Construct an array declarator. LOC is the location of the
3821 beginning of the array (usually the opening brace). EXPR is the
3822 expression inside [], or NULL_TREE. QUALS are the type qualifiers
3823 inside the [] (to be applied to the pointer to which a parameter
3824 array is converted). STATIC_P is true if "static" is inside the
3825 [], false otherwise. VLA_UNSPEC_P is true if the array is [*], a
3826 VLA of unspecified length which is nevertheless a complete type,
3827 false otherwise. The field for the contained declarator is left to
3828 be filled in by set_array_declarator_inner. */
3830 struct c_declarator
*
3831 build_array_declarator (location_t loc
,
3832 tree expr
, struct c_declspecs
*quals
, bool static_p
,
3835 struct c_declarator
*declarator
= XOBNEW (&parser_obstack
,
3836 struct c_declarator
);
3837 declarator
->id_loc
= loc
;
3838 declarator
->kind
= cdk_array
;
3839 declarator
->declarator
= 0;
3840 declarator
->u
.array
.dimen
= expr
;
3843 declarator
->u
.array
.attrs
= quals
->attrs
;
3844 declarator
->u
.array
.quals
= quals_from_declspecs (quals
);
3848 declarator
->u
.array
.attrs
= NULL_TREE
;
3849 declarator
->u
.array
.quals
= 0;
3851 declarator
->u
.array
.static_p
= static_p
;
3852 declarator
->u
.array
.vla_unspec_p
= vla_unspec_p
;
3855 if (static_p
|| quals
!= NULL
)
3856 pedwarn (loc
, OPT_pedantic
,
3857 "ISO C90 does not support %<static%> or type "
3858 "qualifiers in parameter array declarators");
3860 pedwarn (loc
, OPT_pedantic
,
3861 "ISO C90 does not support %<[*]%> array declarators");
3865 if (!current_scope
->parm_flag
)
3868 error_at (loc
, "%<[*]%> not allowed in other than "
3869 "function prototype scope");
3870 declarator
->u
.array
.vla_unspec_p
= false;
3873 current_scope
->had_vla_unspec
= true;
3878 /* Set the contained declarator of an array declarator. DECL is the
3879 declarator, as constructed by build_array_declarator; INNER is what
3880 appears on the left of the []. */
3882 struct c_declarator
*
3883 set_array_declarator_inner (struct c_declarator
*decl
,
3884 struct c_declarator
*inner
)
3886 decl
->declarator
= inner
;
3890 /* INIT is a constructor that forms DECL's initializer. If the final
3891 element initializes a flexible array field, add the size of that
3892 initializer to DECL's size. */
3895 add_flexible_array_elts_to_size (tree decl
, tree init
)
3899 if (VEC_empty (constructor_elt
, CONSTRUCTOR_ELTS (init
)))
3902 elt
= VEC_last (constructor_elt
, CONSTRUCTOR_ELTS (init
))->value
;
3903 type
= TREE_TYPE (elt
);
3904 if (TREE_CODE (type
) == ARRAY_TYPE
3905 && TYPE_SIZE (type
) == NULL_TREE
3906 && TYPE_DOMAIN (type
) != NULL_TREE
3907 && TYPE_MAX_VALUE (TYPE_DOMAIN (type
)) == NULL_TREE
)
3909 complete_array_type (&type
, elt
, false);
3911 = size_binop (PLUS_EXPR
, DECL_SIZE (decl
), TYPE_SIZE (type
));
3912 DECL_SIZE_UNIT (decl
)
3913 = size_binop (PLUS_EXPR
, DECL_SIZE_UNIT (decl
), TYPE_SIZE_UNIT (type
));
3917 /* Decode a "typename", such as "int **", returning a ..._TYPE node.
3918 Set *EXPR, if EXPR not NULL, to any expression to be evaluated
3919 before the type name, and set *EXPR_CONST_OPERANDS, if
3920 EXPR_CONST_OPERANDS not NULL, to indicate whether the type name may
3921 appear in a constant expression. */
3924 groktypename (struct c_type_name
*type_name
, tree
*expr
,
3925 bool *expr_const_operands
)
3928 tree attrs
= type_name
->specs
->attrs
;
3930 type_name
->specs
->attrs
= NULL_TREE
;
3932 type
= grokdeclarator (type_name
->declarator
, type_name
->specs
, TYPENAME
,
3933 false, NULL
, &attrs
, expr
, expr_const_operands
,
3936 /* Apply attributes. */
3937 decl_attributes (&type
, attrs
, 0);
3942 /* Decode a declarator in an ordinary declaration or data definition.
3943 This is called as soon as the type information and variable name
3944 have been parsed, before parsing the initializer if any.
3945 Here we create the ..._DECL node, fill in its type,
3946 and put it on the list of decls for the current context.
3947 The ..._DECL node is returned as the value.
3949 Exception: for arrays where the length is not specified,
3950 the type is left null, to be filled in by `finish_decl'.
3952 Function definitions do not come here; they go to start_function
3953 instead. However, external and forward declarations of functions
3954 do go through here. Structure field declarations are done by
3955 grokfield and not through here. */
3958 start_decl (struct c_declarator
*declarator
, struct c_declspecs
*declspecs
,
3959 bool initialized
, tree attributes
)
3963 tree expr
= NULL_TREE
;
3964 enum deprecated_states deprecated_state
= DEPRECATED_NORMAL
;
3966 /* An object declared as __attribute__((deprecated)) suppresses
3967 warnings of uses of other deprecated items. */
3968 if (lookup_attribute ("deprecated", attributes
))
3969 deprecated_state
= DEPRECATED_SUPPRESS
;
3971 decl
= grokdeclarator (declarator
, declspecs
,
3972 NORMAL
, initialized
, NULL
, &attributes
, &expr
, NULL
,
3978 add_stmt (fold_convert (void_type_node
, expr
));
3980 if (TREE_CODE (decl
) != FUNCTION_DECL
&& MAIN_NAME_P (DECL_NAME (decl
)))
3981 warning (OPT_Wmain
, "%q+D is usually a function", decl
);
3984 /* Is it valid for this decl to have an initializer at all?
3985 If not, set INITIALIZED to zero, which will indirectly
3986 tell 'finish_decl' to ignore the initializer once it is parsed. */
3987 switch (TREE_CODE (decl
))
3990 error ("typedef %qD is initialized (use __typeof__ instead)", decl
);
3995 error ("function %qD is initialized like a variable", decl
);
4000 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
4001 error ("parameter %qD is initialized", decl
);
4006 /* Don't allow initializations for incomplete types except for
4007 arrays which might be completed by the initialization. */
4009 /* This can happen if the array size is an undefined macro.
4010 We already gave a warning, so we don't need another one. */
4011 if (TREE_TYPE (decl
) == error_mark_node
)
4013 else if (COMPLETE_TYPE_P (TREE_TYPE (decl
)))
4015 /* A complete type is ok if size is fixed. */
4017 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl
))) != INTEGER_CST
4018 || C_DECL_VARIABLE_SIZE (decl
))
4020 error ("variable-sized object may not be initialized");
4024 else if (TREE_CODE (TREE_TYPE (decl
)) != ARRAY_TYPE
)
4026 error ("variable %qD has initializer but incomplete type", decl
);
4029 else if (C_DECL_VARIABLE_SIZE (decl
))
4031 /* Although C99 is unclear about whether incomplete arrays
4032 of VLAs themselves count as VLAs, it does not make
4033 sense to permit them to be initialized given that
4034 ordinary VLAs may not be initialized. */
4035 error ("variable-sized object may not be initialized");
4042 if (current_scope
== file_scope
)
4043 TREE_STATIC (decl
) = 1;
4045 /* Tell 'pushdecl' this is an initialized decl
4046 even though we don't yet have the initializer expression.
4047 Also tell 'finish_decl' it may store the real initializer. */
4048 DECL_INITIAL (decl
) = error_mark_node
;
4051 /* If this is a function declaration, write a record describing it to the
4052 prototypes file (if requested). */
4054 if (TREE_CODE (decl
) == FUNCTION_DECL
)
4055 gen_aux_info_record (decl
, 0, 0, prototype_p (TREE_TYPE (decl
)));
4057 /* ANSI specifies that a tentative definition which is not merged with
4058 a non-tentative definition behaves exactly like a definition with an
4059 initializer equal to zero. (Section 3.7.2)
4061 -fno-common gives strict ANSI behavior, though this tends to break
4062 a large body of code that grew up without this rule.
4064 Thread-local variables are never common, since there's no entrenched
4065 body of code to break, and it allows more efficient variable references
4066 in the presence of dynamic linking. */
4068 if (TREE_CODE (decl
) == VAR_DECL
4070 && TREE_PUBLIC (decl
)
4071 && !DECL_THREAD_LOCAL_P (decl
)
4073 DECL_COMMON (decl
) = 1;
4075 /* Set attributes here so if duplicate decl, will have proper attributes. */
4076 decl_attributes (&decl
, attributes
, 0);
4078 /* Handle gnu_inline attribute. */
4079 if (declspecs
->inline_p
4080 && !flag_gnu89_inline
4081 && TREE_CODE (decl
) == FUNCTION_DECL
4082 && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl
))
4083 || current_function_decl
))
4085 if (declspecs
->storage_class
== csc_auto
&& current_scope
!= file_scope
)
4087 else if (declspecs
->storage_class
!= csc_static
)
4088 DECL_EXTERNAL (decl
) = !DECL_EXTERNAL (decl
);
4091 if (TREE_CODE (decl
) == FUNCTION_DECL
4092 && targetm
.calls
.promote_prototypes (TREE_TYPE (decl
)))
4094 struct c_declarator
*ce
= declarator
;
4096 if (ce
->kind
== cdk_pointer
)
4097 ce
= declarator
->declarator
;
4098 if (ce
->kind
== cdk_function
)
4100 tree args
= ce
->u
.arg_info
->parms
;
4101 for (; args
; args
= DECL_CHAIN (args
))
4103 tree type
= TREE_TYPE (args
);
4104 if (type
&& INTEGRAL_TYPE_P (type
)
4105 && TYPE_PRECISION (type
) < TYPE_PRECISION (integer_type_node
))
4106 DECL_ARG_TYPE (args
) = integer_type_node
;
4111 if (TREE_CODE (decl
) == FUNCTION_DECL
4112 && DECL_DECLARED_INLINE_P (decl
)
4113 && DECL_UNINLINABLE (decl
)
4114 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl
)))
4115 warning (OPT_Wattributes
, "inline function %q+D given attribute noinline",
4118 /* C99 6.7.4p3: An inline definition of a function with external
4119 linkage shall not contain a definition of a modifiable object
4120 with static storage duration... */
4121 if (TREE_CODE (decl
) == VAR_DECL
4122 && current_scope
!= file_scope
4123 && TREE_STATIC (decl
)
4124 && !TREE_READONLY (decl
)
4125 && DECL_DECLARED_INLINE_P (current_function_decl
)
4126 && DECL_EXTERNAL (current_function_decl
))
4127 record_inline_static (input_location
, current_function_decl
,
4128 decl
, csi_modifiable
);
4130 if (c_dialect_objc ()
4131 && (TREE_CODE (decl
) == VAR_DECL
4132 || TREE_CODE (decl
) == FUNCTION_DECL
))
4133 objc_check_global_decl (decl
);
4135 /* Add this decl to the current scope.
4136 TEM may equal DECL or it may be a previous decl of the same name. */
4137 tem
= pushdecl (decl
);
4139 if (initialized
&& DECL_EXTERNAL (tem
))
4141 DECL_EXTERNAL (tem
) = 0;
4142 TREE_STATIC (tem
) = 1;
4148 /* Subroutine of finish_decl. TYPE is the type of an uninitialized object
4149 DECL or the non-array element type if DECL is an uninitialized array.
4150 If that type has a const member, diagnose this. */
4153 diagnose_uninitialized_cst_member (tree decl
, tree type
)
4156 for (field
= TYPE_FIELDS (type
); field
; field
= TREE_CHAIN (field
))
4159 if (TREE_CODE (field
) != FIELD_DECL
)
4161 field_type
= strip_array_types (TREE_TYPE (field
));
4163 if (TYPE_QUALS (field_type
) & TYPE_QUAL_CONST
)
4165 warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wc___compat
,
4166 "uninitialized const member in %qT is invalid in C++",
4167 strip_array_types (TREE_TYPE (decl
)));
4168 inform (DECL_SOURCE_LOCATION (field
), "%qD should be initialized", field
);
4171 if (TREE_CODE (field_type
) == RECORD_TYPE
4172 || TREE_CODE (field_type
) == UNION_TYPE
)
4173 diagnose_uninitialized_cst_member (decl
, field_type
);
4177 /* Finish processing of a declaration;
4178 install its initial value.
4179 If ORIGTYPE is not NULL_TREE, it is the original type of INIT.
4180 If the length of an array type is not known before,
4181 it must be determined now, from the initial value, or it is an error.
4183 INIT_LOC is the location of the initial value. */
4186 finish_decl (tree decl
, location_t init_loc
, tree init
,
4187 tree origtype
, tree asmspec_tree
)
4190 bool was_incomplete
= (DECL_SIZE (decl
) == 0);
4191 const char *asmspec
= 0;
4193 /* If a name was specified, get the string. */
4194 if ((TREE_CODE (decl
) == FUNCTION_DECL
|| TREE_CODE (decl
) == VAR_DECL
)
4195 && DECL_FILE_SCOPE_P (decl
))
4196 asmspec_tree
= maybe_apply_renaming_pragma (decl
, asmspec_tree
);
4198 asmspec
= TREE_STRING_POINTER (asmspec_tree
);
4200 if (TREE_CODE (decl
) == VAR_DECL
4201 && TREE_STATIC (decl
)
4202 && global_bindings_p ())
4203 /* So decl is a global variable. Record the types it uses
4204 so that we can decide later to emit debug info for them. */
4205 record_types_used_by_current_var_decl (decl
);
4207 /* If `start_decl' didn't like having an initialization, ignore it now. */
4208 if (init
!= 0 && DECL_INITIAL (decl
) == 0)
4211 /* Don't crash if parm is initialized. */
4212 if (TREE_CODE (decl
) == PARM_DECL
)
4216 store_init_value (init_loc
, decl
, init
, origtype
);
4218 if (c_dialect_objc () && (TREE_CODE (decl
) == VAR_DECL
4219 || TREE_CODE (decl
) == FUNCTION_DECL
4220 || TREE_CODE (decl
) == FIELD_DECL
))
4221 objc_check_decl (decl
);
4223 type
= TREE_TYPE (decl
);
4225 /* Deduce size of array from initialization, if not already known. */
4226 if (TREE_CODE (type
) == ARRAY_TYPE
4227 && TYPE_DOMAIN (type
) == 0
4228 && TREE_CODE (decl
) != TYPE_DECL
)
4231 = (TREE_STATIC (decl
)
4232 /* Even if pedantic, an external linkage array
4233 may have incomplete type at first. */
4234 ? pedantic
&& !TREE_PUBLIC (decl
)
4235 : !DECL_EXTERNAL (decl
));
4237 = complete_array_type (&TREE_TYPE (decl
), DECL_INITIAL (decl
),
4240 /* Get the completed type made by complete_array_type. */
4241 type
= TREE_TYPE (decl
);
4246 error ("initializer fails to determine size of %q+D", decl
);
4251 error ("array size missing in %q+D", decl
);
4252 /* If a `static' var's size isn't known,
4253 make it extern as well as static, so it does not get
4255 If it is not `static', then do not mark extern;
4256 finish_incomplete_decl will give it a default size
4257 and it will get allocated. */
4258 else if (!pedantic
&& TREE_STATIC (decl
) && !TREE_PUBLIC (decl
))
4259 DECL_EXTERNAL (decl
) = 1;
4263 error ("zero or negative size array %q+D", decl
);
4267 /* For global variables, update the copy of the type that
4268 exists in the binding. */
4269 if (TREE_PUBLIC (decl
))
4271 struct c_binding
*b_ext
= I_SYMBOL_BINDING (DECL_NAME (decl
));
4272 while (b_ext
&& !B_IN_EXTERNAL_SCOPE (b_ext
))
4273 b_ext
= b_ext
->shadowed
;
4276 if (b_ext
->u
.type
&& comptypes (b_ext
->u
.type
, type
))
4277 b_ext
->u
.type
= composite_type (b_ext
->u
.type
, type
);
4279 b_ext
->u
.type
= type
;
4288 if (DECL_INITIAL (decl
))
4289 TREE_TYPE (DECL_INITIAL (decl
)) = type
;
4291 layout_decl (decl
, 0);
4294 if (TREE_CODE (decl
) == VAR_DECL
)
4296 if (init
&& TREE_CODE (init
) == CONSTRUCTOR
)
4297 add_flexible_array_elts_to_size (decl
, init
);
4299 if (DECL_SIZE (decl
) == 0 && TREE_TYPE (decl
) != error_mark_node
4300 && COMPLETE_TYPE_P (TREE_TYPE (decl
)))
4301 layout_decl (decl
, 0);
4303 if (DECL_SIZE (decl
) == 0
4304 /* Don't give an error if we already gave one earlier. */
4305 && TREE_TYPE (decl
) != error_mark_node
4306 && (TREE_STATIC (decl
)
4307 /* A static variable with an incomplete type
4308 is an error if it is initialized.
4309 Also if it is not file scope.
4310 Otherwise, let it through, but if it is not `extern'
4311 then it may cause an error message later. */
4312 ? (DECL_INITIAL (decl
) != 0
4313 || !DECL_FILE_SCOPE_P (decl
))
4314 /* An automatic variable with an incomplete type
4316 : !DECL_EXTERNAL (decl
)))
4318 error ("storage size of %q+D isn%'t known", decl
);
4319 TREE_TYPE (decl
) = error_mark_node
;
4322 if ((DECL_EXTERNAL (decl
) || TREE_STATIC (decl
))
4323 && DECL_SIZE (decl
) != 0)
4325 if (TREE_CODE (DECL_SIZE (decl
)) == INTEGER_CST
)
4326 constant_expression_warning (DECL_SIZE (decl
));
4329 if (upc_shared_type_p (TREE_TYPE (decl
)))
4331 gcc_assert (!flag_upc_threads
);
4332 if (TYPE_HAS_THREADS_FACTOR (TREE_TYPE (decl
)))
4333 error ("in the UPC dynamic translation environment, " "THREADS may not appear in declarations "
4334 "of shared arrays with indefinite block size; "
4335 "the storage size of %q+D cannot be calculated",
4338 error ("in the UPC dynamic translation environment, "
4339 "THREADS must appear exactly once in "
4340 "declarations of shared arrays; "
4341 "the storage size of %q+D cannot be calculated",
4345 error ("storage size of %q+D isn%'t constant", decl
);
4346 TREE_TYPE (decl
) = error_mark_node
;
4350 if (TREE_USED (type
))
4352 TREE_USED (decl
) = 1;
4353 DECL_READ_P (decl
) = 1;
4357 /* If this is a function and an assembler name is specified, reset DECL_RTL
4358 so we can give it its new name. Also, update built_in_decls if it
4359 was a normal built-in. */
4360 if (TREE_CODE (decl
) == FUNCTION_DECL
&& asmspec
)
4362 if (DECL_BUILT_IN_CLASS (decl
) == BUILT_IN_NORMAL
)
4363 set_builtin_user_assembler_name (decl
, asmspec
);
4364 set_user_assembler_name (decl
, asmspec
);
4367 /* If #pragma weak was used, mark the decl weak now. */
4368 maybe_apply_pragma_weak (decl
);
4370 /* Output the assembler code and/or RTL code for variables and functions,
4371 unless the type is an undefined structure or union.
4372 If not, it will get done when the type is completed. */
4374 if (TREE_CODE (decl
) == VAR_DECL
|| TREE_CODE (decl
) == FUNCTION_DECL
)
4376 /* Determine the ELF visibility. */
4377 if (TREE_PUBLIC (decl
))
4378 c_determine_visibility (decl
);
4380 /* This is a no-op in c-lang.c or something real in objc-act.c. */
4381 if (c_dialect_objc ())
4382 objc_check_decl (decl
);
4384 /* Give UPC a chance to check the declaration. */
4385 if (c_dialect_upc ())
4386 upc_check_decl (decl
);
4390 /* If this is not a static variable, issue a warning.
4391 It doesn't make any sense to give an ASMSPEC for an
4392 ordinary, non-register local variable. Historically,
4393 GCC has accepted -- but ignored -- the ASMSPEC in
4395 if (!DECL_FILE_SCOPE_P (decl
)
4396 && TREE_CODE (decl
) == VAR_DECL
4397 && !C_DECL_REGISTER (decl
)
4398 && !TREE_STATIC (decl
))
4399 warning (0, "ignoring asm-specifier for non-static local "
4400 "variable %q+D", decl
);
4402 set_user_assembler_name (decl
, asmspec
);
4405 if (DECL_FILE_SCOPE_P (decl
))
4407 if (DECL_INITIAL (decl
) == NULL_TREE
4408 || DECL_INITIAL (decl
) == error_mark_node
)
4409 /* Don't output anything
4410 when a tentative file-scope definition is seen.
4411 But at end of compilation, do output code for them. */
4412 DECL_DEFER_OUTPUT (decl
) = 1;
4413 if (asmspec
&& C_DECL_REGISTER (decl
))
4414 DECL_HARD_REGISTER (decl
) = 1;
4415 rest_of_decl_compilation (decl
, true, 0);
4419 /* In conjunction with an ASMSPEC, the `register'
4420 keyword indicates that we should place the variable
4421 in a particular register. */
4422 if (asmspec
&& C_DECL_REGISTER (decl
))
4424 DECL_HARD_REGISTER (decl
) = 1;
4425 /* This cannot be done for a structure with volatile
4426 fields, on which DECL_REGISTER will have been
4428 if (!DECL_REGISTER (decl
))
4429 error ("cannot put object with volatile field into register");
4432 if (TREE_CODE (decl
) != FUNCTION_DECL
)
4434 /* If we're building a variable sized type, and we might be
4435 reachable other than via the top of the current binding
4436 level, then create a new BIND_EXPR so that we deallocate
4437 the object at the right time. */
4438 /* Note that DECL_SIZE can be null due to errors. */
4439 if (DECL_SIZE (decl
)
4440 && !TREE_CONSTANT (DECL_SIZE (decl
))
4441 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list
))
4444 bind
= build3 (BIND_EXPR
, void_type_node
, NULL
, NULL
, NULL
);
4445 TREE_SIDE_EFFECTS (bind
) = 1;
4447 BIND_EXPR_BODY (bind
) = push_stmt_list ();
4449 add_stmt (build_stmt (DECL_SOURCE_LOCATION (decl
),
4455 if (!DECL_FILE_SCOPE_P (decl
))
4457 /* Recompute the RTL of a local array now
4458 if it used to be an incomplete type. */
4460 && !TREE_STATIC (decl
) && !DECL_EXTERNAL (decl
))
4462 /* If we used it already as memory, it must stay in memory. */
4463 TREE_ADDRESSABLE (decl
) = TREE_USED (decl
);
4464 /* If it's still incomplete now, no init will save it. */
4465 if (DECL_SIZE (decl
) == 0)
4466 DECL_INITIAL (decl
) = 0;
4471 if (TREE_CODE (decl
) == TYPE_DECL
)
4473 if (!DECL_FILE_SCOPE_P (decl
)
4474 && variably_modified_type_p (TREE_TYPE (decl
), NULL_TREE
))
4475 add_stmt (build_stmt (DECL_SOURCE_LOCATION (decl
), DECL_EXPR
, decl
));
4477 rest_of_decl_compilation (decl
, DECL_FILE_SCOPE_P (decl
), 0);
4480 /* Install a cleanup (aka destructor) if one was given. */
4481 if (TREE_CODE (decl
) == VAR_DECL
&& !TREE_STATIC (decl
))
4483 tree attr
= lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl
));
4486 tree cleanup_id
= TREE_VALUE (TREE_VALUE (attr
));
4487 tree cleanup_decl
= lookup_name (cleanup_id
);
4491 /* Build "cleanup(&decl)" for the destructor. */
4492 cleanup
= build_unary_op (input_location
, ADDR_EXPR
, decl
, 0);
4493 vec
= VEC_alloc (tree
, gc
, 1);
4494 VEC_quick_push (tree
, vec
, cleanup
);
4495 cleanup
= build_function_call_vec (DECL_SOURCE_LOCATION (decl
),
4496 cleanup_decl
, vec
, NULL
);
4497 VEC_free (tree
, gc
, vec
);
4499 /* Don't warn about decl unused; the cleanup uses it. */
4500 TREE_USED (decl
) = 1;
4501 TREE_USED (cleanup_decl
) = 1;
4502 DECL_READ_P (decl
) = 1;
4504 push_cleanup (decl
, cleanup
, false);
4509 && TREE_CODE (decl
) == VAR_DECL
4510 && !DECL_EXTERNAL (decl
)
4511 && DECL_INITIAL (decl
) == NULL_TREE
)
4513 type
= strip_array_types (type
);
4514 if (TREE_READONLY (decl
))
4515 warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wc___compat
,
4516 "uninitialized const %qD is invalid in C++", decl
);
4517 else if ((TREE_CODE (type
) == RECORD_TYPE
4518 || TREE_CODE (type
) == UNION_TYPE
)
4519 && C_TYPE_FIELDS_READONLY (type
))
4520 diagnose_uninitialized_cst_member (decl
, type
);
4523 invoke_plugin_callbacks (PLUGIN_FINISH_DECL
, decl
);
4526 /* Given a parsed parameter declaration, decode it into a PARM_DECL.
4527 EXPR is NULL or a pointer to an expression that needs to be
4528 evaluated for the side effects of array size expressions in the
4532 grokparm (const struct c_parm
*parm
, tree
*expr
)
4534 tree attrs
= parm
->attrs
;
4535 tree decl
= grokdeclarator (parm
->declarator
, parm
->specs
, PARM
, false,
4536 NULL
, &attrs
, expr
, NULL
, DEPRECATED_NORMAL
);
4538 decl_attributes (&decl
, attrs
, 0);
4543 /* Given a parsed parameter declaration, decode it into a PARM_DECL
4544 and push that on the current scope. EXPR is a pointer to an
4545 expression that needs to be evaluated for the side effects of array
4546 size expressions in the parameters. */
4549 push_parm_decl (const struct c_parm
*parm
, tree
*expr
)
4551 tree attrs
= parm
->attrs
;
4554 decl
= grokdeclarator (parm
->declarator
, parm
->specs
, PARM
, false, NULL
,
4555 &attrs
, expr
, NULL
, DEPRECATED_NORMAL
);
4556 decl_attributes (&decl
, attrs
, 0);
4558 decl
= pushdecl (decl
);
4560 finish_decl (decl
, input_location
, NULL_TREE
, NULL_TREE
, NULL_TREE
);
4563 /* Mark all the parameter declarations to date as forward decls.
4564 Also diagnose use of this extension. */
4567 mark_forward_parm_decls (void)
4569 struct c_binding
*b
;
4571 if (pedantic
&& !current_scope
->warned_forward_parm_decls
)
4573 pedwarn (input_location
, OPT_pedantic
,
4574 "ISO C forbids forward parameter declarations");
4575 current_scope
->warned_forward_parm_decls
= true;
4578 for (b
= current_scope
->bindings
; b
; b
= b
->prev
)
4579 if (TREE_CODE (b
->decl
) == PARM_DECL
)
4580 TREE_ASM_WRITTEN (b
->decl
) = 1;
4583 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
4584 literal, which may be an incomplete array type completed by the
4585 initializer; INIT is a CONSTRUCTOR at LOC that initializes the compound
4586 literal. NON_CONST is true if the initializers contain something
4587 that cannot occur in a constant expression. */
4590 build_compound_literal (location_t loc
, tree type
, tree init
, bool non_const
)
4592 /* We do not use start_decl here because we have a type, not a declarator;
4593 and do not use finish_decl because the decl should be stored inside
4594 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_EXPR. */
4599 if (type
== error_mark_node
4600 || init
== error_mark_node
)
4601 return error_mark_node
;
4603 decl
= build_decl (loc
, VAR_DECL
, NULL_TREE
, type
);
4604 DECL_EXTERNAL (decl
) = 0;
4605 TREE_PUBLIC (decl
) = 0;
4606 TREE_STATIC (decl
) = (current_scope
== file_scope
);
4607 DECL_CONTEXT (decl
) = current_function_decl
;
4608 TREE_USED (decl
) = 1;
4609 DECL_READ_P (decl
) = 1;
4610 TREE_TYPE (decl
) = type
;
4611 TREE_READONLY (decl
) = TYPE_READONLY (type
);
4612 store_init_value (loc
, decl
, init
, NULL_TREE
);
4614 if (TREE_CODE (type
) == ARRAY_TYPE
&& !COMPLETE_TYPE_P (type
))
4616 int failure
= complete_array_type (&TREE_TYPE (decl
),
4617 DECL_INITIAL (decl
), true);
4618 gcc_assert (!failure
);
4620 type
= TREE_TYPE (decl
);
4621 TREE_TYPE (DECL_INITIAL (decl
)) = type
;
4624 if (type
== error_mark_node
|| !COMPLETE_TYPE_P (type
))
4625 return error_mark_node
;
4627 stmt
= build_stmt (DECL_SOURCE_LOCATION (decl
), DECL_EXPR
, decl
);
4628 complit
= build1 (COMPOUND_LITERAL_EXPR
, type
, stmt
);
4629 TREE_SIDE_EFFECTS (complit
) = 1;
4631 layout_decl (decl
, 0);
4633 if (TREE_STATIC (decl
))
4635 /* This decl needs a name for the assembler output. */
4636 set_compound_literal_name (decl
);
4637 DECL_DEFER_OUTPUT (decl
) = 1;
4638 DECL_COMDAT (decl
) = 1;
4639 DECL_ARTIFICIAL (decl
) = 1;
4640 DECL_IGNORED_P (decl
) = 1;
4642 rest_of_decl_compilation (decl
, 1, 0);
4647 complit
= build2 (C_MAYBE_CONST_EXPR
, type
, NULL
, complit
);
4648 C_MAYBE_CONST_EXPR_NON_CONST (complit
) = 1;
4654 /* Check the type of a compound literal. Here we just check that it
4655 is valid for C++. */
4658 check_compound_literal_type (location_t loc
, struct c_type_name
*type_name
)
4661 && (type_name
->specs
->typespec_kind
== ctsk_tagdef
4662 || type_name
->specs
->typespec_kind
== ctsk_tagfirstref
))
4663 warning_at (loc
, OPT_Wc___compat
,
4664 "defining a type in a compound literal is invalid in C++");
4667 /* Determine whether TYPE is a structure with a flexible array member,
4668 or a union containing such a structure (possibly recursively). */
4671 flexible_array_type_p (tree type
)
4674 switch (TREE_CODE (type
))
4677 x
= TYPE_FIELDS (type
);
4680 while (DECL_CHAIN (x
) != NULL_TREE
)
4682 if (TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
4683 && TYPE_SIZE (TREE_TYPE (x
)) == NULL_TREE
4684 && TYPE_DOMAIN (TREE_TYPE (x
)) != NULL_TREE
4685 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x
))) == NULL_TREE
)
4689 for (x
= TYPE_FIELDS (type
); x
!= NULL_TREE
; x
= DECL_CHAIN (x
))
4691 if (flexible_array_type_p (TREE_TYPE (x
)))
4700 /* Performs sanity checks on the TYPE and WIDTH of the bit-field NAME,
4701 replacing with appropriate values if they are invalid. */
4703 check_bitfield_type_and_width (tree
*type
, tree
*width
, tree orig_name
)
4706 unsigned int max_width
;
4707 unsigned HOST_WIDE_INT w
;
4708 const char *name
= (orig_name
4709 ? identifier_to_locale (IDENTIFIER_POINTER (orig_name
))
4710 : _("<anonymous>"));
4712 /* Detect and ignore out of range field width and process valid
4714 if (!INTEGRAL_TYPE_P (TREE_TYPE (*width
)))
4716 error ("bit-field %qs width not an integer constant", name
);
4717 *width
= integer_one_node
;
4721 if (TREE_CODE (*width
) != INTEGER_CST
)
4723 *width
= c_fully_fold (*width
, false, NULL
);
4724 if (TREE_CODE (*width
) == INTEGER_CST
)
4725 pedwarn (input_location
, OPT_pedantic
,
4726 "bit-field %qs width not an integer constant expression",
4729 if (TREE_CODE (*width
) != INTEGER_CST
)
4731 error ("bit-field %qs width not an integer constant", name
);
4732 *width
= integer_one_node
;
4734 constant_expression_warning (*width
);
4735 if (tree_int_cst_sgn (*width
) < 0)
4737 error ("negative width in bit-field %qs", name
);
4738 *width
= integer_one_node
;
4740 else if (integer_zerop (*width
) && orig_name
)
4742 error ("zero width for bit-field %qs", name
);
4743 *width
= integer_one_node
;
4747 /* Detect invalid bit-field type. */
4748 if (TREE_CODE (*type
) != INTEGER_TYPE
4749 && TREE_CODE (*type
) != BOOLEAN_TYPE
4750 && TREE_CODE (*type
) != ENUMERAL_TYPE
)
4752 error ("bit-field %qs has invalid type", name
);
4753 *type
= unsigned_type_node
;
4756 type_mv
= TYPE_MAIN_VARIANT (*type
);
4757 if (!in_system_header
4758 && type_mv
!= integer_type_node
4759 && type_mv
!= unsigned_type_node
4760 && type_mv
!= boolean_type_node
)
4761 pedwarn (input_location
, OPT_pedantic
,
4762 "type of bit-field %qs is a GCC extension", name
);
4764 max_width
= TYPE_PRECISION (*type
);
4766 if (0 < compare_tree_int (*width
, max_width
))
4768 error ("width of %qs exceeds its type", name
);
4770 *width
= build_int_cst (integer_type_node
, w
);
4773 w
= tree_low_cst (*width
, 1);
4775 if (TREE_CODE (*type
) == ENUMERAL_TYPE
)
4777 struct lang_type
*lt
= TYPE_LANG_SPECIFIC (*type
);
4779 || w
< tree_int_cst_min_precision (lt
->enum_min
, TYPE_UNSIGNED (*type
))
4780 || w
< tree_int_cst_min_precision (lt
->enum_max
, TYPE_UNSIGNED (*type
)))
4781 warning (0, "%qs is narrower than values of its type", name
);
4787 /* Print warning about variable length array if necessary. */
4790 warn_variable_length_array (tree name
, tree size
)
4792 int const_size
= TREE_CONSTANT (size
);
4794 if (!flag_isoc99
&& pedantic
&& warn_vla
!= 0)
4799 pedwarn (input_location
, OPT_Wvla
,
4800 "ISO C90 forbids array %qE whose size "
4801 "can%'t be evaluated",
4804 pedwarn (input_location
, OPT_Wvla
, "ISO C90 forbids array whose size "
4805 "can%'t be evaluated");
4810 pedwarn (input_location
, OPT_Wvla
,
4811 "ISO C90 forbids variable length array %qE",
4814 pedwarn (input_location
, OPT_Wvla
, "ISO C90 forbids variable length array");
4817 else if (warn_vla
> 0)
4823 "the size of array %qE can"
4824 "%'t be evaluated", name
);
4827 "the size of array can %'t be evaluated");
4833 "variable length array %qE is used",
4837 "variable length array is used");
4842 /* Given declspecs and a declarator,
4843 determine the name and type of the object declared
4844 and construct a ..._DECL node for it.
4845 (In one case we can return a ..._TYPE node instead.
4846 For invalid input we sometimes return 0.)
4848 DECLSPECS is a c_declspecs structure for the declaration specifiers.
4850 DECL_CONTEXT says which syntactic context this declaration is in:
4851 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
4852 FUNCDEF for a function definition. Like NORMAL but a few different
4853 error messages in each case. Return value may be zero meaning
4854 this definition is too screwy to try to parse.
4855 PARM for a parameter declaration (either within a function prototype
4856 or before a function body). Make a PARM_DECL, or return void_type_node.
4857 TYPENAME if for a typename (in a cast or sizeof).
4858 Don't make a DECL node; just return the ..._TYPE node.
4859 FIELD for a struct or union field; make a FIELD_DECL.
4860 INITIALIZED is true if the decl has an initializer.
4861 WIDTH is non-NULL for bit-fields, and is a pointer to an INTEGER_CST node
4862 representing the width of the bit-field.
4863 DECL_ATTRS points to the list of attributes that should be added to this
4864 decl. Any nested attributes that belong on the decl itself will be
4866 If EXPR is not NULL, any expressions that need to be evaluated as
4867 part of evaluating variably modified types will be stored in *EXPR.
4868 If EXPR_CONST_OPERANDS is not NULL, *EXPR_CONST_OPERANDS will be
4869 set to indicate whether operands in *EXPR can be used in constant
4871 DEPRECATED_STATE is a deprecated_states value indicating whether
4872 deprecation warnings should be suppressed.
4874 In the TYPENAME case, DECLARATOR is really an absolute declarator.
4875 It may also be so in the PARM case, for a prototype where the
4876 argument type is specified but not the name.
4878 This function is where the complicated C meanings of `static'
4879 and `extern' are interpreted. */
4882 grokdeclarator (const struct c_declarator
*declarator
,
4883 struct c_declspecs
*declspecs
,
4884 enum decl_context decl_context
, bool initialized
, tree
*width
,
4885 tree
*decl_attrs
, tree
*expr
, bool *expr_const_operands
,
4886 enum deprecated_states deprecated_state
)
4888 tree type
= declspecs
->type
;
4889 bool threadp
= declspecs
->thread_p
;
4890 enum c_storage_class storage_class
= declspecs
->storage_class
;
4897 int type_quals
= TYPE_UNQUALIFIED
;
4898 tree name
= NULL_TREE
;
4899 bool funcdef_flag
= false;
4900 bool funcdef_syntax
= false;
4901 bool size_varies
= false;
4902 tree decl_attr
= declspecs
->decl_attr
;
4903 int array_ptr_quals
= TYPE_UNQUALIFIED
;
4904 tree array_ptr_attrs
= NULL_TREE
;
4905 int array_parm_static
= 0;
4906 bool array_parm_vla_unspec_p
= false;
4907 tree returned_attrs
= NULL_TREE
;
4908 int upc_threads_ref
= 0; /* for static declarations of shared arrays */
4909 tree upc_layout_qualifier
;
4910 tree upc_elem_block_factor
;
4911 tree upc_block_factor
= NULL
;
4912 bool bitfield
= width
!= NULL
;
4914 struct c_arg_info
*arg_info
= 0;
4915 addr_space_t as1
, as2
, address_space
;
4916 location_t loc
= UNKNOWN_LOCATION
;
4919 bool expr_const_operands_dummy
;
4920 enum c_declarator_kind first_non_attr_kind
;
4922 if (TREE_CODE (type
) == ERROR_MARK
)
4923 return error_mark_node
;
4926 if (expr_const_operands
== NULL
)
4927 expr_const_operands
= &expr_const_operands_dummy
;
4929 *expr
= declspecs
->expr
;
4930 *expr_const_operands
= declspecs
->expr_const_operands
;
4932 if (decl_context
== FUNCDEF
)
4933 funcdef_flag
= true, decl_context
= NORMAL
;
4935 /* Look inside a declarator for the name being declared
4936 and get it as an IDENTIFIER_NODE, for an error message. */
4938 const struct c_declarator
*decl
= declarator
;
4940 first_non_attr_kind
= cdk_attrs
;
4950 funcdef_syntax
= (decl
->kind
== cdk_function
);
4951 decl
= decl
->declarator
;
4952 if (first_non_attr_kind
== cdk_attrs
)
4953 first_non_attr_kind
= decl
->kind
;
4957 decl
= decl
->declarator
;
4964 if (first_non_attr_kind
== cdk_attrs
)
4965 first_non_attr_kind
= decl
->kind
;
4974 gcc_assert (decl_context
== PARM
4975 || decl_context
== TYPENAME
4976 || (decl_context
== FIELD
4977 && declarator
->kind
== cdk_id
));
4978 gcc_assert (!initialized
);
4982 /* A function definition's declarator must have the form of
4983 a function declarator. */
4985 if (funcdef_flag
&& !funcdef_syntax
)
4988 /* If this looks like a function definition, make it one,
4989 even if it occurs where parms are expected.
4990 Then store_parm_decls will reject it and not use it as a parm. */
4991 if (decl_context
== NORMAL
&& !funcdef_flag
&& current_scope
->parm_flag
)
4992 decl_context
= PARM
;
4994 if (declspecs
->deprecated_p
&& deprecated_state
!= DEPRECATED_SUPPRESS
)
4995 warn_deprecated_use (declspecs
->type
, declspecs
->decl_attr
);
4997 if ((decl_context
== NORMAL
|| decl_context
== FIELD
)
4998 && current_scope
== file_scope
4999 && variably_modified_type_p (type
, NULL_TREE
))
5002 error_at (loc
, "variably modified %qE at file scope", name
);
5004 error_at (loc
, "variably modified field at file scope");
5005 type
= integer_type_node
;
5008 size_varies
= C_TYPE_VARIABLE_SIZE (type
) != 0;
5010 upc_threads_ref
= TYPE_HAS_THREADS_FACTOR (type
);
5012 /* Diagnose defaulting to "int". */
5014 if (declspecs
->default_int_p
&& !in_system_header
)
5016 /* Issue a warning if this is an ISO C 99 program or if
5017 -Wreturn-type and this is a function, or if -Wimplicit;
5018 prefer the former warning since it is more explicit. */
5019 if ((warn_implicit_int
|| warn_return_type
|| flag_isoc99
)
5021 warn_about_return_type
= 1;
5025 pedwarn_c99 (loc
, flag_isoc99
? 0 : OPT_Wimplicit_int
,
5026 "type defaults to %<int%> in declaration of %qE",
5029 pedwarn_c99 (input_location
, flag_isoc99
? 0 : OPT_Wimplicit_int
,
5030 "type defaults to %<int%> in type name");
5034 /* Adjust the type if a bit-field is being declared,
5035 -funsigned-bitfields applied and the type is not explicitly
5037 if (bitfield
&& !flag_signed_bitfields
&& !declspecs
->explicit_signed_p
5038 && TREE_CODE (type
) == INTEGER_TYPE
)
5039 type
= unsigned_type_for (type
);
5041 /* Figure out the type qualifiers for the declaration. There are
5042 two ways a declaration can become qualified. One is something
5043 like `const int i' where the `const' is explicit. Another is
5044 something like `typedef const int CI; CI i' where the type of the
5045 declaration contains the `const'. A third possibility is that
5046 there is a type qualifier on the element type of a typedefed
5047 array type, in which case we should extract that qualifier so
5048 that c_apply_type_quals_to_decl receives the full list of
5049 qualifiers to work with (C90 is not entirely clear about whether
5050 duplicate qualifiers should be diagnosed in this case, but it
5051 seems most appropriate to do so). */
5052 element_type
= strip_array_types (type
);
5053 constp
= declspecs
->const_p
+ TYPE_READONLY (element_type
);
5054 restrictp
= declspecs
->restrict_p
+ TYPE_RESTRICT (element_type
);
5055 volatilep
= declspecs
->volatile_p
+ TYPE_VOLATILE (element_type
);
5056 sharedp
= declspecs
->shared_p
+ upc_shared_type_p (element_type
);
5057 strictp
= declspecs
->strict_p
+ TYPE_STRICT (element_type
);
5058 relaxedp
= declspecs
->relaxed_p
+ TYPE_RELAXED (element_type
);
5059 upc_elem_block_factor
= TYPE_BLOCK_FACTOR (element_type
);
5060 upc_layout_qualifier
= declspecs
->upc_layout_qualifier
;
5061 as1
= declspecs
->address_space
;
5062 as2
= TYPE_ADDR_SPACE (element_type
);
5063 address_space
= ADDR_SPACE_GENERIC_P (as1
)? as2
: as1
;
5065 if (pedantic
&& !flag_isoc99
)
5068 pedwarn (loc
, OPT_pedantic
, "duplicate %<const%>");
5070 pedwarn (loc
, OPT_pedantic
, "duplicate %<restrict%>");
5072 pedwarn (loc
, OPT_pedantic
, "duplicate %<volatile%>");
5074 pedwarn (loc
, OPT_pedantic
, "duplicate %<shared%>");
5076 pedwarn (loc
, OPT_pedantic
, "duplicate %<strict%>");
5078 pedwarn (loc
, OPT_pedantic
, "duplicate %<relaxed%>");
5080 if (strictp
&& relaxedp
)
5081 error_at (loc
, "UPC shared variable %qE is declared "
5082 "both strict and relaxed", name
);
5083 if (strictp
&& !sharedp
)
5084 error_at (loc
, "%qE is declared with UPC strict qualifier "
5085 "but not shared", name
);
5086 if (relaxedp
&& !sharedp
)
5087 error_at (loc
, "%qE is declared with UPC relaxed qualifier "
5088 "but not shared", name
);
5090 if (!ADDR_SPACE_GENERIC_P (as1
) && !ADDR_SPACE_GENERIC_P (as2
) && as1
!= as2
)
5091 error_at (loc
, "conflicting named address spaces (%s vs %s)",
5092 c_addr_space_name (as1
), c_addr_space_name (as2
));
5094 if ((TREE_CODE (type
) == ARRAY_TYPE
5095 || first_non_attr_kind
== cdk_array
)
5096 && TYPE_QUALS (element_type
))
5097 type
= TYPE_MAIN_VARIANT (type
);
5098 type_quals
= ((constp
? TYPE_QUAL_CONST
: 0)
5099 | (restrictp
? TYPE_QUAL_RESTRICT
: 0)
5100 | (volatilep
? TYPE_QUAL_VOLATILE
: 0)
5101 | (sharedp
? TYPE_QUAL_SHARED
: 0)
5102 | (strictp
? TYPE_QUAL_STRICT
: 0)
5103 | (relaxedp
? TYPE_QUAL_RELAXED
: 0)
5104 | ENCODE_QUAL_ADDR_SPACE (address_space
));
5106 /* Warn about storage classes that are invalid for certain
5107 kinds of declarations (parameters, typenames, etc.). */
5111 || storage_class
== csc_auto
5112 || storage_class
== csc_register
5113 || storage_class
== csc_typedef
))
5115 if (storage_class
== csc_auto
)
5117 (current_scope
== file_scope
) ? 0 : OPT_pedantic
,
5118 "function definition declared %<auto%>");
5119 if (storage_class
== csc_register
)
5120 error_at (loc
, "function definition declared %<register%>");
5121 if (storage_class
== csc_typedef
)
5122 error_at (loc
, "function definition declared %<typedef%>");
5124 error_at (loc
, "function definition declared %<__thread%>");
5126 if (storage_class
== csc_auto
5127 || storage_class
== csc_register
5128 || storage_class
== csc_typedef
)
5129 storage_class
= csc_none
;
5131 else if (decl_context
!= NORMAL
&& (storage_class
!= csc_none
|| threadp
))
5133 if (decl_context
== PARM
&& storage_class
== csc_register
)
5137 switch (decl_context
)
5141 error_at (loc
, "storage class specified for structure "
5144 error_at (loc
, "storage class specified for structure field");
5148 error_at (loc
, "storage class specified for parameter %qE",
5151 error_at (loc
, "storage class specified for unnamed parameter");
5154 error_at (loc
, "storage class specified for typename");
5157 storage_class
= csc_none
;
5161 else if (storage_class
== csc_extern
5165 /* 'extern' with initialization is invalid if not at file scope. */
5166 if (current_scope
== file_scope
)
5168 /* It is fine to have 'extern const' when compiling at C
5169 and C++ intersection. */
5170 if (!(warn_cxx_compat
&& constp
))
5171 warning_at (loc
, 0, "%qE initialized and declared %<extern%>",
5175 error_at (loc
, "%qE has both %<extern%> and initializer", name
);
5177 else if (current_scope
== file_scope
)
5179 if (storage_class
== csc_auto
)
5180 error_at (loc
, "file-scope declaration of %qE specifies %<auto%>",
5182 if (pedantic
&& storage_class
== csc_register
)
5183 pedwarn (input_location
, OPT_pedantic
,
5184 "file-scope declaration of %qE specifies %<register%>", name
);
5188 if (storage_class
== csc_extern
&& funcdef_flag
)
5189 error_at (loc
, "nested function %qE declared %<extern%>", name
);
5190 else if (threadp
&& storage_class
== csc_none
)
5192 error_at (loc
, "function-scope %qE implicitly auto and declared "
5199 /* Now figure out the structure of the declarator proper.
5200 Descend through it, creating more complex types, until we reach
5201 the declared identifier (or NULL_TREE, in an absolute declarator).
5202 At each stage we maintain an unqualified version of the type
5203 together with any qualifiers that should be applied to it with
5204 c_build_qualified_type; this way, array types including
5205 multidimensional array types are first built up in unqualified
5206 form and then the qualified form is created with
5207 TYPE_MAIN_VARIANT pointing to the unqualified form. */
5209 while (declarator
&& declarator
->kind
!= cdk_id
)
5211 if (type
== error_mark_node
)
5213 declarator
= declarator
->declarator
;
5217 /* Each level of DECLARATOR is either a cdk_array (for ...[..]),
5218 a cdk_pointer (for *...),
5219 a cdk_function (for ...(...)),
5220 a cdk_attrs (for nested attributes),
5221 or a cdk_id (for the name being declared
5222 or the place in an absolute declarator
5223 where the name was omitted).
5224 For the last case, we have just exited the loop.
5226 At this point, TYPE is the type of elements of an array,
5227 or for a function to return, or for a pointer to point to.
5228 After this sequence of ifs, TYPE is the type of the
5229 array or function or pointer, and DECLARATOR has had its
5230 outermost layer removed. */
5232 if (array_ptr_quals
!= TYPE_UNQUALIFIED
5233 || array_ptr_attrs
!= NULL_TREE
5234 || array_parm_static
)
5236 /* Only the innermost declarator (making a parameter be of
5237 array type which is converted to pointer type)
5238 may have static or type qualifiers. */
5239 error_at (loc
, "static or type qualifiers in non-parameter array declarator");
5240 array_ptr_quals
= TYPE_UNQUALIFIED
;
5241 array_ptr_attrs
= NULL_TREE
;
5242 array_parm_static
= 0;
5245 switch (declarator
->kind
)
5249 /* A declarator with embedded attributes. */
5250 tree attrs
= declarator
->u
.attrs
;
5251 const struct c_declarator
*inner_decl
;
5253 declarator
= declarator
->declarator
;
5254 inner_decl
= declarator
;
5255 while (inner_decl
->kind
== cdk_attrs
)
5256 inner_decl
= inner_decl
->declarator
;
5257 if (inner_decl
->kind
== cdk_id
)
5258 attr_flags
|= (int) ATTR_FLAG_DECL_NEXT
;
5259 else if (inner_decl
->kind
== cdk_function
)
5260 attr_flags
|= (int) ATTR_FLAG_FUNCTION_NEXT
;
5261 else if (inner_decl
->kind
== cdk_array
)
5262 attr_flags
|= (int) ATTR_FLAG_ARRAY_NEXT
;
5263 returned_attrs
= decl_attributes (&type
,
5264 chainon (returned_attrs
, attrs
),
5270 tree itype
= NULL_TREE
;
5271 tree size
= declarator
->u
.array
.dimen
;
5272 /* The index is a signed object `sizetype' bits wide. */
5273 tree index_type
= c_common_signed_type (sizetype
);
5275 array_ptr_quals
= declarator
->u
.array
.quals
;
5276 array_ptr_attrs
= declarator
->u
.array
.attrs
;
5277 array_parm_static
= declarator
->u
.array
.static_p
;
5278 array_parm_vla_unspec_p
= declarator
->u
.array
.vla_unspec_p
;
5280 declarator
= declarator
->declarator
;
5282 /* Check for some types that there cannot be arrays of. */
5284 if (VOID_TYPE_P (type
))
5287 error_at (loc
, "declaration of %qE as array of voids", name
);
5289 error_at (loc
, "declaration of type name as array of voids");
5290 type
= error_mark_node
;
5293 if (TREE_CODE (type
) == FUNCTION_TYPE
)
5296 error_at (loc
, "declaration of %qE as array of functions",
5299 error_at (loc
, "declaration of type name as array of "
5301 type
= error_mark_node
;
5304 if (pedantic
&& !in_system_header
&& flexible_array_type_p (type
))
5305 pedwarn (loc
, OPT_pedantic
,
5306 "invalid use of structure with flexible array member");
5308 if (size
== error_mark_node
)
5309 type
= error_mark_node
;
5311 if (type
== error_mark_node
)
5314 /* If size was specified, set ITYPE to a range-type for
5315 that size. Otherwise, ITYPE remains null. finish_decl
5316 may figure it out from an initial value. */
5320 bool size_maybe_const
= true;
5321 bool size_int_const
= (TREE_CODE (size
) == INTEGER_CST
5322 && !TREE_OVERFLOW (size
));
5323 bool this_size_varies
= false;
5325 /* Strip NON_LVALUE_EXPRs since we aren't using as an
5327 STRIP_TYPE_NOPS (size
);
5329 if (!INTEGRAL_TYPE_P (TREE_TYPE (size
)))
5332 error_at (loc
, "size of array %qE has non-integer type",
5336 "size of unnamed array has non-integer type");
5337 size
= integer_one_node
;
5340 size
= c_fully_fold (size
, false, &size_maybe_const
);
5342 if (pedantic
&& size_maybe_const
&& integer_zerop (size
))
5345 pedwarn (loc
, OPT_pedantic
,
5346 "ISO C forbids zero-size array %qE", name
);
5348 pedwarn (loc
, OPT_pedantic
,
5349 "ISO C forbids zero-size array");
5352 if (TREE_CODE (size
) == INTEGER_CST
&& size_maybe_const
)
5354 constant_expression_warning (size
);
5355 if (tree_int_cst_sgn (size
) < 0)
5358 error_at (loc
, "size of array %qE is negative", name
);
5360 error_at (loc
, "size of unnamed array is negative");
5361 size
= integer_one_node
;
5363 /* Handle a size folded to an integer constant but
5364 not an integer constant expression. */
5365 if (!size_int_const
)
5367 /* If this is a file scope declaration of an
5368 ordinary identifier, this is invalid code;
5369 diagnosing it here and not subsequently
5370 treating the type as variable-length avoids
5371 more confusing diagnostics later. */
5372 if ((decl_context
== NORMAL
|| decl_context
== FIELD
)
5373 && current_scope
== file_scope
)
5374 pedwarn (input_location
, 0,
5375 "variably modified %qE at file scope",
5378 this_size_varies
= size_varies
= true;
5379 warn_variable_length_array (name
, size
);
5382 else if (sharedp
&& count_upc_threads_refs (size
))
5384 /* We have a shared array with a non-constant
5385 dimension. If the expression is a factor of
5386 THREADS, then we'll need to set the flag
5387 in the result type. Otherwise, it is an error. */
5388 int n_thread_refs
= count_upc_threads_refs (size
);
5389 if (upc_threads_ref
|| n_thread_refs
> 1)
5391 error_at (loc
, "UPC shared array declaration references THREADS "
5392 "more than once; the size of %qE "
5393 "cannot be calculated", name
);
5394 size
= integer_one_node
;
5396 else if (!is_multiple_of_upc_threads (size
))
5398 error_at (loc
, "UPC shared array dimension is not a simple multiple "
5399 "of THREADS; the size of %qE "
5400 "cannot be calculated.", name
);
5401 size
= integer_one_node
;
5405 upc_threads_ref
= 1;
5406 set_upc_threads_refs_to_one (&size
);
5408 if (TREE_CODE (size
) != INTEGER_CST
)
5410 error_at (loc
, "UPC forbids variable-size shared array %qE",
5412 size
= integer_one_node
;
5416 else if ((decl_context
== NORMAL
|| decl_context
== FIELD
)
5417 && current_scope
== file_scope
)
5419 error_at (loc
, "variably modified %qE at file scope", name
);
5420 size
= integer_one_node
;
5424 /* Make sure the array size remains visibly
5425 nonconstant even if it is (eg) a const variable
5426 with known value. */
5427 this_size_varies
= size_varies
= true;
5428 warn_variable_length_array (name
, size
);
5431 if (integer_zerop (size
) && !this_size_varies
)
5433 /* A zero-length array cannot be represented with
5434 an unsigned index type, which is what we'll
5435 get with build_index_type. Create an
5436 open-ended range instead. */
5437 itype
= build_range_type (sizetype
, size
, NULL_TREE
);
5441 /* Arrange for the SAVE_EXPR on the inside of the
5442 MINUS_EXPR, which allows the -1 to get folded
5443 with the +1 that happens when building TYPE_SIZE. */
5445 size
= save_expr (size
);
5446 if (this_size_varies
&& TREE_CODE (size
) == INTEGER_CST
)
5447 size
= build2 (COMPOUND_EXPR
, TREE_TYPE (size
),
5448 integer_zero_node
, size
);
5450 /* Compute the maximum valid index, that is, size
5451 - 1. Do the calculation in index_type, so that
5452 if it is a variable the computations will be
5453 done in the proper mode. */
5454 itype
= fold_build2_loc (loc
, MINUS_EXPR
, index_type
,
5455 convert (index_type
, size
),
5456 convert (index_type
,
5459 /* The above overflows when size does not fit
5461 ??? While a size of INT_MAX+1 technically shouldn't
5462 cause an overflow (because we subtract 1), handling
5463 this case seems like an unnecessary complication. */
5464 if (TREE_CODE (size
) == INTEGER_CST
5465 && !int_fits_type_p (size
, index_type
))
5468 error_at (loc
, "size of array %qE is too large",
5471 error_at (loc
, "size of unnamed array is too large");
5472 type
= error_mark_node
;
5476 itype
= build_index_type (itype
);
5478 if (this_size_varies
)
5481 *expr
= build2 (COMPOUND_EXPR
, TREE_TYPE (size
),
5485 *expr_const_operands
&= size_maybe_const
;
5488 else if (decl_context
== FIELD
)
5490 bool flexible_array_member
= false;
5491 if (array_parm_vla_unspec_p
)
5492 /* Field names can in fact have function prototype
5493 scope so [*] is disallowed here through making
5494 the field variably modified, not through being
5495 something other than a declaration with function
5500 const struct c_declarator
*t
= declarator
;
5501 while (t
->kind
== cdk_attrs
)
5503 flexible_array_member
= (t
->kind
== cdk_id
);
5505 if (flexible_array_member
5506 && pedantic
&& !flag_isoc99
&& !in_system_header
)
5507 pedwarn (loc
, OPT_pedantic
,
5508 "ISO C90 does not support flexible array members");
5510 /* ISO C99 Flexible array members are effectively
5511 identical to GCC's zero-length array extension. */
5512 if (flexible_array_member
|| array_parm_vla_unspec_p
)
5513 itype
= build_range_type (sizetype
, size_zero_node
,
5516 else if (decl_context
== PARM
)
5518 if (array_parm_vla_unspec_p
)
5520 itype
= build_range_type (sizetype
, size_zero_node
, NULL_TREE
);
5524 else if (decl_context
== TYPENAME
)
5526 if (array_parm_vla_unspec_p
)
5529 warning (0, "%<[*]%> not in a declaration");
5530 /* We use this to avoid messing up with incomplete
5531 array types of the same type, that would
5532 otherwise be modified below. */
5533 itype
= build_range_type (sizetype
, size_zero_node
,
5539 /* Complain about arrays of incomplete types. */
5540 if (!COMPLETE_TYPE_P (type
))
5542 error_at (loc
, "array type has incomplete element type");
5543 type
= error_mark_node
;
5546 /* When itype is NULL, a shared incomplete array type is
5547 returned for all array of a given type. Elsewhere we
5548 make sure we don't complete that type before copying
5549 it, but here we want to make sure we don't ever
5550 modify the shared type, so we gcc_assert (itype)
5553 addr_space_t as
= DECODE_QUAL_ADDR_SPACE (type_quals
);
5554 if (!ADDR_SPACE_GENERIC_P (as
) && as
!= TYPE_ADDR_SPACE (type
))
5555 type
= build_qualified_type (type
,
5556 ENCODE_QUAL_ADDR_SPACE (as
));
5558 type
= build_array_type (type
, itype
);
5561 if (type
!= error_mark_node
)
5565 /* It is ok to modify type here even if itype is
5566 NULL: if size_varies, we're in a
5567 multi-dimensional array and the inner type has
5568 variable size, so the enclosing shared array type
5570 if (size
&& TREE_CODE (size
) == INTEGER_CST
)
5572 = build_distinct_type_copy (TYPE_MAIN_VARIANT (type
));
5573 C_TYPE_VARIABLE_SIZE (type
) = 1;
5576 if (upc_threads_ref
)
5578 /* We need a unique type copy here for UPC shared
5579 array types compiled in a dynamic threads enviroment
5580 that reference THREADS as a multiplier; to avoid
5581 setting the "has threads factor" bit in
5582 a re-used non- UPC shared array type node. */
5583 if (size
&& TREE_CODE (size
) == INTEGER_CST
)
5584 type
= build_distinct_type_copy (TYPE_MAIN_VARIANT (type
));
5585 TYPE_HAS_THREADS_FACTOR (type
) = 1;
5588 /* The GCC extension for zero-length arrays differs from
5589 ISO flexible array members in that sizeof yields
5591 if (size
&& integer_zerop (size
))
5594 type
= build_distinct_type_copy (TYPE_MAIN_VARIANT (type
));
5595 TYPE_SIZE (type
) = bitsize_zero_node
;
5596 TYPE_SIZE_UNIT (type
) = size_zero_node
;
5597 SET_TYPE_STRUCTURAL_EQUALITY (type
);
5599 if (array_parm_vla_unspec_p
)
5602 /* The type is complete. C99 6.7.5.2p4 */
5603 type
= build_distinct_type_copy (TYPE_MAIN_VARIANT (type
));
5604 TYPE_SIZE (type
) = bitsize_zero_node
;
5605 TYPE_SIZE_UNIT (type
) = size_zero_node
;
5606 SET_TYPE_STRUCTURAL_EQUALITY (type
);
5610 if (decl_context
!= PARM
5611 && (array_ptr_quals
!= TYPE_UNQUALIFIED
5612 || array_ptr_attrs
!= NULL_TREE
5613 || array_parm_static
))
5615 error_at (loc
, "static or type qualifiers in non-parameter array declarator");
5616 array_ptr_quals
= TYPE_UNQUALIFIED
;
5617 array_ptr_attrs
= NULL_TREE
;
5618 array_parm_static
= 0;
5624 /* Say it's a definition only for the declarator closest
5625 to the identifier, apart possibly from some
5627 bool really_funcdef
= false;
5631 const struct c_declarator
*t
= declarator
->declarator
;
5632 while (t
->kind
== cdk_attrs
)
5634 really_funcdef
= (t
->kind
== cdk_id
);
5637 /* Declaring a function type. Make sure we have a valid
5638 type for the function to return. */
5639 if (type
== error_mark_node
)
5642 size_varies
= false;
5643 upc_threads_ref
= 0;
5644 upc_layout_qualifier
= 0;
5646 /* Warn about some types functions can't return. */
5647 if (TREE_CODE (type
) == FUNCTION_TYPE
)
5650 error_at (loc
, "%qE declared as function returning a "
5653 error_at (loc
, "type name declared as function "
5654 "returning a function");
5655 type
= integer_type_node
;
5657 if (TREE_CODE (type
) == ARRAY_TYPE
)
5660 error_at (loc
, "%qE declared as function returning an array",
5663 error_at (loc
, "type name declared as function returning "
5665 type
= integer_type_node
;
5667 errmsg
= targetm
.invalid_return_type (type
);
5671 type
= integer_type_node
;
5674 /* Construct the function type and go to the next
5675 inner layer of declarator. */
5676 arg_info
= declarator
->u
.arg_info
;
5677 arg_types
= grokparms (arg_info
, really_funcdef
);
5679 /* Type qualifiers before the return type of the function
5680 qualify the return type, not the function type. */
5683 /* Type qualifiers on a function return type are
5684 normally permitted by the standard but have no
5685 effect, so give a warning at -Wreturn-type.
5686 Qualifiers on a void return type are banned on
5687 function definitions in ISO C; GCC used to used
5688 them for noreturn functions. */
5689 if (VOID_TYPE_P (type
) && really_funcdef
)
5691 "function definition has qualified void return type");
5692 else if (type_quals
& TYPE_QUAL_SHARED
)
5694 error_at (loc
, "function definition has UPC shared qualified return type");
5695 type_quals
&= ~(TYPE_QUAL_SHARED
| TYPE_QUAL_STRICT
5696 | TYPE_QUAL_RELAXED
);
5699 warning_at (loc
, OPT_Wignored_qualifiers
,
5700 "type qualifiers ignored on function return type");
5702 type
= c_build_qualified_type (type
, type_quals
);
5704 type_quals
= TYPE_UNQUALIFIED
;
5706 type
= build_function_type (type
, arg_types
);
5707 declarator
= declarator
->declarator
;
5709 /* Set the TYPE_CONTEXTs for each tagged type which is local to
5710 the formal parameter list of this FUNCTION_TYPE to point to
5711 the FUNCTION_TYPE node itself. */
5716 FOR_EACH_VEC_ELT_REVERSE (c_arg_tag
, arg_info
->tags
, ix
, tag
)
5717 TYPE_CONTEXT (tag
->type
) = type
;
5723 /* Merge any constancy or volatility into the target type
5726 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
5728 pedwarn (loc
, OPT_pedantic
,
5729 "ISO C forbids qualified function types");
5731 if (upc_layout_qualifier
)
5732 upc_block_factor
= upc_grok_layout_qualifier (
5733 loc
, POINTER_TYPE
, type
,
5734 NULL_TREE
, upc_layout_qualifier
);
5737 type
= c_build_qualified_type_1 (type
, type_quals
,
5740 size_varies
= false;
5741 upc_threads_ref
= 0;
5742 upc_block_factor
= 0;
5744 /* When the pointed-to type involves components of variable size,
5745 care must be taken to ensure that the size evaluation code is
5746 emitted early enough to dominate all the possible later uses
5747 and late enough for the variables on which it depends to have
5750 This is expected to happen automatically when the pointed-to
5751 type has a name/declaration of it's own, but special attention
5752 is required if the type is anonymous.
5754 We handle the NORMAL and FIELD contexts here by attaching an
5755 artificial TYPE_DECL to such pointed-to type. This forces the
5756 sizes evaluation at a safe point and ensures it is not deferred
5757 until e.g. within a deeper conditional context.
5759 We expect nothing to be needed here for PARM or TYPENAME.
5760 Pushing a TYPE_DECL at this point for TYPENAME would actually
5761 be incorrect, as we might be in the middle of an expression
5762 with side effects on the pointed-to type size "arguments" prior
5763 to the pointer declaration point and the fake TYPE_DECL in the
5764 enclosing context would force the size evaluation prior to the
5767 if (!TYPE_NAME (type
)
5768 && (decl_context
== NORMAL
|| decl_context
== FIELD
)
5769 && variably_modified_type_p (type
, NULL_TREE
))
5771 tree decl
= build_decl (loc
, TYPE_DECL
, NULL_TREE
, type
);
5772 DECL_ARTIFICIAL (decl
) = 1;
5774 finish_decl (decl
, loc
, NULL_TREE
, NULL_TREE
, NULL_TREE
);
5775 TYPE_NAME (type
) = decl
;
5778 type
= build_pointer_type (type
);
5780 /* Process type qualifiers (such as const or volatile)
5781 that were given inside the `*'. */
5782 type_quals
= declarator
->u
.pointer
.quals
;
5783 upc_layout_qualifier
= declarator
->u
.pointer
.upc_layout_qual
;
5784 sharedp
= ((type_quals
& TYPE_QUAL_SHARED
) != 0);
5786 declarator
= declarator
->declarator
;
5793 *decl_attrs
= chainon (returned_attrs
, *decl_attrs
);
5795 /* Now TYPE has the actual type, apart from any qualifiers in
5798 /* Warn about address space used for things other than static memory or
5800 address_space
= DECODE_QUAL_ADDR_SPACE (type_quals
);
5801 if (!ADDR_SPACE_GENERIC_P (address_space
))
5803 if (decl_context
== NORMAL
)
5805 switch (storage_class
)
5808 error ("%qs combined with %<auto%> qualifier for %qE",
5809 c_addr_space_name (address_space
), name
);
5812 error ("%qs combined with %<register%> qualifier for %qE",
5813 c_addr_space_name (address_space
), name
);
5816 if (current_function_scope
)
5818 error ("%qs specified for auto variable %qE",
5819 c_addr_space_name (address_space
), name
);
5831 else if (decl_context
== PARM
&& TREE_CODE (type
) != ARRAY_TYPE
)
5834 error ("%qs specified for parameter %qE",
5835 c_addr_space_name (address_space
), name
);
5837 error ("%qs specified for unnamed parameter",
5838 c_addr_space_name (address_space
));
5840 else if (decl_context
== FIELD
)
5843 error ("%qs specified for structure field %qE",
5844 c_addr_space_name (address_space
), name
);
5846 error ("%qs specified for structure field",
5847 c_addr_space_name (address_space
));
5851 /* Check the type and width of a bit-field. */
5853 check_bitfield_type_and_width (&type
, width
, name
);
5855 /* Check for UPC's layout qualifier. */
5856 if (upc_layout_qualifier
|| upc_elem_block_factor
)
5858 upc_block_factor
= upc_grok_layout_qualifier (loc
, TREE_CODE (type
), type
,
5859 upc_elem_block_factor
, upc_layout_qualifier
);
5860 upc_layout_qualifier
= 0;
5863 /* Did array size calculations overflow? */
5865 if (TREE_CODE (type
) == ARRAY_TYPE
5866 && COMPLETE_TYPE_P (type
)
5867 && TREE_CODE (TYPE_SIZE_UNIT (type
)) == INTEGER_CST
5868 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type
)))
5871 error_at (loc
, "size of array %qE is too large", name
);
5873 error_at (loc
, "size of unnamed array is too large");
5874 /* If we proceed with the array type as it is, we'll eventually
5875 crash in tree_low_cst(). */
5876 type
= error_mark_node
;
5879 /* If this is declaring a typedef name, return a TYPE_DECL. */
5881 if (storage_class
== csc_typedef
)
5884 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
5886 pedwarn (loc
, OPT_pedantic
,
5887 "ISO C forbids qualified function types");
5889 type
= c_build_qualified_type_1 (type
, type_quals
, upc_block_factor
);
5891 decl
= build_decl (declarator
->id_loc
,
5892 TYPE_DECL
, declarator
->u
.id
, type
);
5893 if (declspecs
->explicit_signed_p
)
5894 C_TYPEDEF_EXPLICITLY_SIGNED (decl
) = 1;
5895 if (declspecs
->inline_p
)
5896 pedwarn (loc
, 0,"typedef %q+D declared %<inline%>", decl
);
5897 if (declspecs
->noreturn_p
)
5898 pedwarn (loc
, 0,"typedef %q+D declared %<_Noreturn%>", decl
);
5900 if (warn_cxx_compat
&& declarator
->u
.id
!= NULL_TREE
)
5902 struct c_binding
*b
= I_TAG_BINDING (declarator
->u
.id
);
5905 && b
->decl
!= NULL_TREE
5906 && (B_IN_CURRENT_SCOPE (b
)
5907 || (current_scope
== file_scope
&& B_IN_EXTERNAL_SCOPE (b
)))
5908 && TYPE_MAIN_VARIANT (b
->decl
) != TYPE_MAIN_VARIANT (type
))
5910 warning_at (declarator
->id_loc
, OPT_Wc___compat
,
5911 ("using %qD as both a typedef and a tag is "
5914 if (b
->locus
!= UNKNOWN_LOCATION
)
5915 inform (b
->locus
, "originally defined here");
5922 /* If this is a type name (such as, in a cast or sizeof),
5923 compute the type and return it now. */
5925 if (decl_context
== TYPENAME
)
5927 /* Note that the grammar rejects storage classes in typenames
5929 gcc_assert (storage_class
== csc_none
&& !threadp
5930 && !declspecs
->inline_p
&& !declspecs
->noreturn_p
);
5931 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
5933 pedwarn (loc
, OPT_pedantic
,
5934 "ISO C forbids const or volatile function types");
5936 type
= c_build_qualified_type_1 (type
, type_quals
, upc_block_factor
);
5940 if (pedantic
&& decl_context
== FIELD
5941 && variably_modified_type_p (type
, NULL_TREE
))
5944 pedwarn (loc
, OPT_pedantic
, "a member of a structure or union cannot "
5945 "have a variably modified type");
5948 /* Aside from typedefs and type names (handle above),
5949 `void' at top level (not within pointer)
5950 is allowed only in public variables.
5951 We don't complain about parms either, but that is because
5952 a better error message can be made later. */
5954 if (VOID_TYPE_P (type
) && decl_context
!= PARM
5955 && !((decl_context
!= FIELD
&& TREE_CODE (type
) != FUNCTION_TYPE
)
5956 && (storage_class
== csc_extern
5957 || (current_scope
== file_scope
5958 && !(storage_class
== csc_static
5959 || storage_class
== csc_register
)))))
5961 error_at (loc
, "variable or field %qE declared void", name
);
5962 type
= integer_type_node
;
5965 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
5966 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
5971 if (decl_context
== PARM
)
5975 /* A parameter declared as an array of T is really a pointer to T.
5976 One declared as a function is really a pointer to a function. */
5978 if (TREE_CODE (type
) == ARRAY_TYPE
)
5980 /* Transfer const-ness of array into that of type pointed to. */
5981 type
= TREE_TYPE (type
);
5983 type
= c_build_qualified_type_1 (type
, type_quals
,
5985 type
= build_pointer_type (type
);
5986 type_quals
= array_ptr_quals
;
5988 type
= c_build_qualified_type (type
, type_quals
);
5990 /* We don't yet implement attributes in this context. */
5991 if (array_ptr_attrs
!= NULL_TREE
)
5992 warning_at (loc
, OPT_Wattributes
,
5993 "attributes in parameter array declarator ignored");
5995 size_varies
= false;
5996 upc_threads_ref
= 0;
5997 upc_block_factor
= 0;
5999 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
6002 pedwarn (loc
, OPT_pedantic
,
6003 "ISO C forbids qualified function types");
6005 type
= c_build_qualified_type (type
, type_quals
);
6006 type
= build_pointer_type (type
);
6007 type_quals
= TYPE_UNQUALIFIED
;
6009 else if (type_quals
& TYPE_QUAL_SHARED
)
6011 error ("parameter declared with UPC shared qualifier");
6012 type_quals
&= ~(TYPE_QUAL_SHARED
| TYPE_QUAL_STRICT
6013 | TYPE_QUAL_RELAXED
);
6015 else if (type_quals
)
6016 type
= c_build_qualified_type (type
, type_quals
);
6018 decl
= build_decl (declarator
->id_loc
,
6019 PARM_DECL
, declarator
->u
.id
, type
);
6021 C_DECL_VARIABLE_SIZE (decl
) = 1;
6023 /* Compute the type actually passed in the parmlist,
6024 for the case where there is no prototype.
6025 (For example, shorts and chars are passed as ints.)
6026 When there is a prototype, this is overridden later. */
6028 if (type
== error_mark_node
)
6029 promoted_type
= type
;
6031 promoted_type
= c_type_promotes_to (type
);
6033 DECL_ARG_TYPE (decl
) = promoted_type
;
6034 if (declspecs
->inline_p
)
6035 pedwarn (loc
, 0, "parameter %q+D declared %<inline%>", decl
);
6036 if (declspecs
->noreturn_p
)
6037 pedwarn (loc
, 0, "parameter %q+D declared %<_Noreturn%>", decl
);
6039 else if (decl_context
== FIELD
)
6041 /* Note that the grammar rejects storage classes in typenames
6043 gcc_assert (storage_class
== csc_none
&& !threadp
6044 && !declspecs
->inline_p
&& !declspecs
->noreturn_p
);
6046 /* Structure field. It may not be a function. */
6048 if (TREE_CODE (type
) == FUNCTION_TYPE
)
6050 error_at (loc
, "field %qE declared as a function", name
);
6051 type
= build_pointer_type (type
);
6053 else if (TREE_CODE (type
) != ERROR_MARK
6054 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type
))
6057 error_at (loc
, "field %qE has incomplete type", name
);
6059 error_at (loc
, "unnamed field has incomplete type");
6060 type
= error_mark_node
;
6062 else if (type_quals
& TYPE_QUAL_SHARED
)
6064 error_at (loc
, "field %qE declared with UPC shared qualifier",
6066 type_quals
&= ~(TYPE_QUAL_SHARED
| TYPE_QUAL_STRICT
6067 | TYPE_QUAL_RELAXED
);
6069 type
= c_build_qualified_type (type
, type_quals
);
6070 decl
= build_decl (declarator
->id_loc
,
6071 FIELD_DECL
, declarator
->u
.id
, type
);
6072 DECL_NONADDRESSABLE_P (decl
) = bitfield
;
6073 if (bitfield
&& !declarator
->u
.id
)
6074 TREE_NO_WARNING (decl
) = 1;
6077 C_DECL_VARIABLE_SIZE (decl
) = 1;
6079 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
6081 if (storage_class
== csc_register
|| threadp
)
6083 error_at (loc
, "invalid storage class for function %qE", name
);
6085 else if (current_scope
!= file_scope
)
6087 /* Function declaration not at file scope. Storage
6088 classes other than `extern' are not allowed, C99
6089 6.7.1p5, and `extern' makes no difference. However,
6090 GCC allows 'auto', perhaps with 'inline', to support
6091 nested functions. */
6092 if (storage_class
== csc_auto
)
6093 pedwarn (loc
, OPT_pedantic
,
6094 "invalid storage class for function %qE", name
);
6095 else if (storage_class
== csc_static
)
6097 error_at (loc
, "invalid storage class for function %qE", name
);
6099 storage_class
= declspecs
->storage_class
= csc_none
;
6105 decl
= build_decl (declarator
->id_loc
,
6106 FUNCTION_DECL
, declarator
->u
.id
, type
);
6107 decl
= build_decl_attribute_variant (decl
, decl_attr
);
6109 if (pedantic
&& type_quals
&& !DECL_IN_SYSTEM_HEADER (decl
))
6110 pedwarn (loc
, OPT_pedantic
,
6111 "ISO C forbids qualified function types");
6113 /* Every function declaration is an external reference
6114 (DECL_EXTERNAL) except for those which are not at file
6115 scope and are explicitly declared "auto". This is
6116 forbidden by standard C (C99 6.7.1p5) and is interpreted by
6117 GCC to signify a forward declaration of a nested function. */
6118 if (storage_class
== csc_auto
&& current_scope
!= file_scope
)
6119 DECL_EXTERNAL (decl
) = 0;
6120 /* In C99, a function which is declared 'inline' with 'extern'
6121 is not an external reference (which is confusing). It
6122 means that the later definition of the function must be output
6123 in this file, C99 6.7.4p6. In GNU C89, a function declared
6124 'extern inline' is an external reference. */
6125 else if (declspecs
->inline_p
&& storage_class
!= csc_static
)
6126 DECL_EXTERNAL (decl
) = ((storage_class
== csc_extern
)
6127 == flag_gnu89_inline
);
6129 DECL_EXTERNAL (decl
) = !initialized
;
6131 /* Record absence of global scope for `static' or `auto'. */
6133 = !(storage_class
== csc_static
|| storage_class
== csc_auto
);
6135 /* For a function definition, record the argument information
6136 block where store_parm_decls will look for it. */
6138 current_function_arg_info
= arg_info
;
6140 if (declspecs
->default_int_p
)
6141 C_FUNCTION_IMPLICIT_INT (decl
) = 1;
6143 /* Record presence of `inline' and `_Noreturn', if it is
6145 if (flag_hosted
&& MAIN_NAME_P (declarator
->u
.id
))
6147 if (declspecs
->inline_p
)
6148 pedwarn (loc
, 0, "cannot inline function %<main%>");
6149 if (declspecs
->noreturn_p
)
6150 pedwarn (loc
, 0, "%<main%> declared %<_Noreturn%>");
6154 if (declspecs
->inline_p
)
6155 /* Record that the function is declared `inline'. */
6156 DECL_DECLARED_INLINE_P (decl
) = 1;
6157 if (declspecs
->noreturn_p
)
6162 pedwarn (loc
, OPT_pedantic
,
6163 "ISO C99 does not support %<_Noreturn%>");
6165 pedwarn (loc
, OPT_pedantic
,
6166 "ISO C90 does not support %<_Noreturn%>");
6168 TREE_THIS_VOLATILE (decl
) = 1;
6174 /* It's a variable. */
6175 /* An uninitialized decl with `extern' is a reference. */
6176 int extern_ref
= !initialized
&& storage_class
== csc_extern
;
6178 if ((type_quals
& TYPE_QUAL_SHARED
)
6180 && !((current_scope
== file_scope
)
6181 || (storage_class
== csc_static
)))
6183 error_at (loc
, "UPC does not support shared auto variables");
6186 type
= c_build_qualified_type_1 (type
, type_quals
, upc_block_factor
);
6188 /* C99 6.2.2p7: It is invalid (compile-time undefined
6189 behavior) to create an 'extern' declaration for a
6190 variable if there is a global declaration that is
6191 'static' and the global declaration is not visible.
6192 (If the static declaration _is_ currently visible,
6193 the 'extern' declaration is taken to refer to that decl.) */
6194 if (extern_ref
&& current_scope
!= file_scope
)
6196 tree global_decl
= identifier_global_value (declarator
->u
.id
);
6197 tree visible_decl
= lookup_name (declarator
->u
.id
);
6200 && global_decl
!= visible_decl
6201 && TREE_CODE (global_decl
) == VAR_DECL
6202 && !TREE_PUBLIC (global_decl
))
6203 error_at (loc
, "variable previously declared %<static%> "
6204 "redeclared %<extern%>");
6207 decl
= build_decl (declarator
->id_loc
,
6208 VAR_DECL
, declarator
->u
.id
, type
);
6210 C_DECL_VARIABLE_SIZE (decl
) = 1;
6212 if (declspecs
->inline_p
)
6213 pedwarn (loc
, 0, "variable %q+D declared %<inline%>", decl
);
6214 if (declspecs
->noreturn_p
)
6215 pedwarn (loc
, 0, "variable %q+D declared %<_Noreturn%>", decl
);
6217 /* At file scope, an initialized extern declaration may follow
6218 a static declaration. In that case, DECL_EXTERNAL will be
6219 reset later in start_decl. */
6220 DECL_EXTERNAL (decl
) = (storage_class
== csc_extern
);
6222 /* At file scope, the presence of a `static' or `register' storage
6223 class specifier, or the absence of all storage class specifiers
6224 makes this declaration a definition (perhaps tentative). Also,
6225 the absence of `static' makes it public. */
6226 if (current_scope
== file_scope
)
6228 TREE_PUBLIC (decl
) = storage_class
!= csc_static
;
6229 TREE_STATIC (decl
) = !extern_ref
;
6231 /* Not at file scope, only `static' makes a static definition. */
6234 TREE_STATIC (decl
) = (storage_class
== csc_static
);
6235 /* UPC's 'shared' attribute implies that the storage
6236 is 'static' to the extent it is stored in
6238 if (type_quals
& TYPE_QUAL_SHARED
)
6239 TREE_STATIC (decl
) = 1;
6240 TREE_PUBLIC (decl
) = extern_ref
;
6244 DECL_TLS_MODEL (decl
) = decl_default_tls_model (decl
);
6247 if ((storage_class
== csc_extern
6248 || (storage_class
== csc_none
6249 && TREE_CODE (type
) == FUNCTION_TYPE
6251 && variably_modified_type_p (type
, NULL_TREE
))
6254 if (TREE_CODE (type
) == FUNCTION_TYPE
)
6255 error_at (loc
, "non-nested function with variably modified type");
6257 error_at (loc
, "object with variably modified type must have "
6261 /* Record `register' declaration for warnings on &
6262 and in case doing stupid register allocation. */
6264 if (storage_class
== csc_register
)
6266 C_DECL_REGISTER (decl
) = 1;
6267 DECL_REGISTER (decl
) = 1;
6270 /* Record constancy and volatility. */
6271 c_apply_type_quals_to_decl (type_quals
, decl
);
6273 /* If a type has volatile components, it should be stored in memory.
6274 Otherwise, the fact that those components are volatile
6275 will be ignored, and would even crash the compiler.
6276 Of course, this only makes sense on VAR,PARM, and RESULT decl's. */
6277 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl
))
6278 && (TREE_CODE (decl
) == VAR_DECL
|| TREE_CODE (decl
) == PARM_DECL
6279 || TREE_CODE (decl
) == RESULT_DECL
))
6281 /* It is not an error for a structure with volatile fields to
6282 be declared register, but reset DECL_REGISTER since it
6283 cannot actually go in a register. */
6284 int was_reg
= C_DECL_REGISTER (decl
);
6285 C_DECL_REGISTER (decl
) = 0;
6286 DECL_REGISTER (decl
) = 0;
6287 c_mark_addressable (decl
);
6288 C_DECL_REGISTER (decl
) = was_reg
;
6291 /* This is the earliest point at which we might know the assembler
6292 name of a variable. Thus, if it's known before this, die horribly. */
6293 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl
));
6296 && TREE_CODE (decl
) == VAR_DECL
6297 && TREE_PUBLIC (decl
)
6298 && TREE_STATIC (decl
)
6299 && (TREE_CODE (TREE_TYPE (decl
)) == RECORD_TYPE
6300 || TREE_CODE (TREE_TYPE (decl
)) == UNION_TYPE
6301 || TREE_CODE (TREE_TYPE (decl
)) == ENUMERAL_TYPE
)
6302 && TYPE_NAME (TREE_TYPE (decl
)) == NULL_TREE
)
6303 warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wc___compat
,
6304 ("non-local variable %qD with anonymous type is "
6305 "questionable in C++"),
6308 /* Shared variables are given their own link section on
6309 most target platforms, and if compiling in pthreads mode
6310 regular local file scope variables are made thread local. */
6311 if ((TREE_CODE(decl
) == VAR_DECL
)
6312 && !threadp
&& (TREE_SHARED (decl
) || flag_upc_pthreads
))
6313 upc_set_decl_section (decl
);
6319 /* Decode the parameter-list info for a function type or function definition.
6320 The argument is the value returned by `get_parm_info' (or made in c-parse.c
6321 if there is an identifier list instead of a parameter decl list).
6322 These two functions are separate because when a function returns
6323 or receives functions then each is called multiple times but the order
6324 of calls is different. The last call to `grokparms' is always the one
6325 that contains the formal parameter names of a function definition.
6327 Return a list of arg types to use in the FUNCTION_TYPE for this function.
6329 FUNCDEF_FLAG is true for a function definition, false for
6330 a mere declaration. A nonempty identifier-list gets an error message
6331 when FUNCDEF_FLAG is false. */
6334 grokparms (struct c_arg_info
*arg_info
, bool funcdef_flag
)
6336 tree arg_types
= arg_info
->types
;
6338 if (funcdef_flag
&& arg_info
->had_vla_unspec
)
6340 /* A function definition isn't function prototype scope C99 6.2.1p4. */
6342 error ("%<[*]%> not allowed in other than function prototype scope");
6345 if (arg_types
== 0 && !funcdef_flag
&& !in_system_header
)
6346 warning (OPT_Wstrict_prototypes
,
6347 "function declaration isn%'t a prototype");
6349 if (arg_types
== error_mark_node
)
6350 return 0; /* don't set TYPE_ARG_TYPES in this case */
6352 else if (arg_types
&& TREE_CODE (TREE_VALUE (arg_types
)) == IDENTIFIER_NODE
)
6356 pedwarn (input_location
, 0, "parameter names (without types) in function declaration");
6357 arg_info
->parms
= NULL_TREE
;
6360 arg_info
->parms
= arg_info
->types
;
6362 arg_info
->types
= 0;
6367 tree parm
, type
, typelt
;
6368 unsigned int parmno
;
6371 /* If there is a parameter of incomplete type in a definition,
6372 this is an error. In a declaration this is valid, and a
6373 struct or union type may be completed later, before any calls
6374 or definition of the function. In the case where the tag was
6375 first declared within the parameter list, a warning has
6376 already been given. If a parameter has void type, then
6377 however the function cannot be defined or called, so
6380 for (parm
= arg_info
->parms
, typelt
= arg_types
, parmno
= 1;
6382 parm
= DECL_CHAIN (parm
), typelt
= TREE_CHAIN (typelt
), parmno
++)
6384 type
= TREE_VALUE (typelt
);
6385 if (type
== error_mark_node
)
6388 if (!COMPLETE_TYPE_P (type
))
6392 if (DECL_NAME (parm
))
6393 error_at (input_location
,
6394 "parameter %u (%q+D) has incomplete type",
6397 error_at (DECL_SOURCE_LOCATION (parm
),
6398 "parameter %u has incomplete type",
6401 TREE_VALUE (typelt
) = error_mark_node
;
6402 TREE_TYPE (parm
) = error_mark_node
;
6403 arg_types
= NULL_TREE
;
6405 else if (VOID_TYPE_P (type
))
6407 if (DECL_NAME (parm
))
6408 warning_at (input_location
, 0,
6409 "parameter %u (%q+D) has void type",
6412 warning_at (DECL_SOURCE_LOCATION (parm
), 0,
6413 "parameter %u has void type",
6418 errmsg
= targetm
.invalid_parameter_type (type
);
6422 TREE_VALUE (typelt
) = error_mark_node
;
6423 TREE_TYPE (parm
) = error_mark_node
;
6424 arg_types
= NULL_TREE
;
6427 if (DECL_NAME (parm
) && TREE_USED (parm
))
6428 warn_if_shadowing (parm
);
6434 /* Allocate and initialize a c_arg_info structure from the parser's
6438 build_arg_info (void)
6440 struct c_arg_info
*ret
= XOBNEW (&parser_obstack
, struct c_arg_info
);
6441 ret
->parms
= NULL_TREE
;
6443 ret
->types
= NULL_TREE
;
6444 ret
->others
= NULL_TREE
;
6445 ret
->pending_sizes
= NULL
;
6446 ret
->had_vla_unspec
= 0;
6450 /* Take apart the current scope and return a c_arg_info structure with
6451 info on a parameter list just parsed.
6453 This structure is later fed to 'grokparms' and 'store_parm_decls'.
6455 ELLIPSIS being true means the argument list ended in '...' so don't
6456 append a sentinel (void_list_node) to the end of the type-list.
6458 EXPR is NULL or an expression that needs to be evaluated for the
6459 side effects of array size expressions in the parameters. */
6462 get_parm_info (bool ellipsis
, tree expr
)
6464 struct c_binding
*b
= current_scope
->bindings
;
6465 struct c_arg_info
*arg_info
= build_arg_info ();
6468 VEC(c_arg_tag
,gc
) *tags
= NULL
;
6472 static bool explained_incomplete_types
= false;
6473 bool gave_void_only_once_err
= false;
6475 arg_info
->had_vla_unspec
= current_scope
->had_vla_unspec
;
6477 /* The bindings in this scope must not get put into a block.
6478 We will take care of deleting the binding nodes. */
6479 current_scope
->bindings
= 0;
6481 /* This function is only called if there was *something* on the
6485 /* A parameter list consisting solely of 'void' indicates that the
6486 function takes no arguments. But if the 'void' is qualified
6487 (by 'const' or 'volatile'), or has a storage class specifier
6488 ('register'), then the behavior is undefined; issue an error.
6489 Typedefs for 'void' are OK (see DR#157). */
6490 if (b
->prev
== 0 /* one binding */
6491 && TREE_CODE (b
->decl
) == PARM_DECL
/* which is a parameter */
6492 && !DECL_NAME (b
->decl
) /* anonymous */
6493 && VOID_TYPE_P (TREE_TYPE (b
->decl
))) /* of void type */
6495 if (TREE_THIS_VOLATILE (b
->decl
)
6496 || TREE_READONLY (b
->decl
)
6497 || C_DECL_REGISTER (b
->decl
))
6498 error ("%<void%> as only parameter may not be qualified");
6500 /* There cannot be an ellipsis. */
6502 error ("%<void%> must be the only parameter");
6504 arg_info
->types
= void_list_node
;
6509 types
= void_list_node
;
6511 /* Break up the bindings list into parms, tags, types, and others;
6512 apply sanity checks; purge the name-to-decl bindings. */
6515 tree decl
= b
->decl
;
6516 tree type
= TREE_TYPE (decl
);
6518 const char *keyword
;
6520 switch (TREE_CODE (decl
))
6525 gcc_assert (I_SYMBOL_BINDING (b
->id
) == b
);
6526 I_SYMBOL_BINDING (b
->id
) = b
->shadowed
;
6529 /* Check for forward decls that never got their actual decl. */
6530 if (TREE_ASM_WRITTEN (decl
))
6531 error ("parameter %q+D has just a forward declaration", decl
);
6532 /* Check for (..., void, ...) and issue an error. */
6533 else if (VOID_TYPE_P (type
) && !DECL_NAME (decl
))
6535 if (!gave_void_only_once_err
)
6537 error ("%<void%> must be the only parameter");
6538 gave_void_only_once_err
= true;
6543 /* Valid parameter, add it to the list. */
6544 DECL_CHAIN (decl
) = parms
;
6547 /* Since there is a prototype, args are passed in their
6548 declared types. The back end may override this later. */
6549 DECL_ARG_TYPE (decl
) = type
;
6550 types
= tree_cons (0, type
, types
);
6554 case ENUMERAL_TYPE
: keyword
= "enum"; goto tag
;
6555 case UNION_TYPE
: keyword
= "union"; goto tag
;
6556 case RECORD_TYPE
: keyword
= "struct"; goto tag
;
6558 /* Types may not have tag-names, in which case the type
6559 appears in the bindings list with b->id NULL. */
6562 gcc_assert (I_TAG_BINDING (b
->id
) == b
);
6563 I_TAG_BINDING (b
->id
) = b
->shadowed
;
6566 /* Warn about any struct, union or enum tags defined in a
6567 parameter list. The scope of such types is limited to
6568 the parameter list, which is rarely if ever desirable
6569 (it's impossible to call such a function with type-
6570 correct arguments). An anonymous union parm type is
6571 meaningful as a GNU extension, so don't warn for that. */
6572 if (TREE_CODE (decl
) != UNION_TYPE
|| b
->id
!= 0)
6575 /* The %s will be one of 'struct', 'union', or 'enum'. */
6576 warning (0, "%<%s %E%> declared inside parameter list",
6579 /* The %s will be one of 'struct', 'union', or 'enum'. */
6580 warning (0, "anonymous %s declared inside parameter list",
6583 if (!explained_incomplete_types
)
6585 warning (0, "its scope is only this definition or declaration,"
6586 " which is probably not what you want");
6587 explained_incomplete_types
= true;
6591 tag
= VEC_safe_push (c_arg_tag
, gc
, tags
, NULL
);
6599 /* CONST_DECLs appear here when we have an embedded enum,
6600 and TYPE_DECLs appear here when we have an embedded struct
6601 or union. No warnings for this - we already warned about the
6602 type itself. FUNCTION_DECLs appear when there is an implicit
6603 function declaration in the parameter list. */
6605 /* When we reinsert this decl in the function body, we need
6606 to reconstruct whether it was marked as nested. */
6607 gcc_assert (TREE_CODE (decl
) == FUNCTION_DECL
6610 DECL_CHAIN (decl
) = others
;
6615 /* error_mark_node appears here when we have an undeclared
6616 variable. Just throw it away. */
6619 gcc_assert (I_SYMBOL_BINDING (b
->id
) == b
);
6620 I_SYMBOL_BINDING (b
->id
) = b
->shadowed
;
6624 /* Other things that might be encountered. */
6631 b
= free_binding_and_advance (b
);
6634 arg_info
->parms
= parms
;
6635 arg_info
->tags
= tags
;
6636 arg_info
->types
= types
;
6637 arg_info
->others
= others
;
6638 arg_info
->pending_sizes
= expr
;
6642 /* Get the struct, enum or union (CODE says which) with tag NAME.
6643 Define the tag as a forward-reference with location LOC if it is
6644 not defined. Return a c_typespec structure for the type
6648 parser_xref_tag (location_t loc
, enum tree_code code
, tree name
)
6650 struct c_typespec ret
;
6654 ret
.expr
= NULL_TREE
;
6655 ret
.expr_const_operands
= true;
6657 /* If a cross reference is requested, look up the type
6658 already defined for this tag and return it. */
6660 ref
= lookup_tag (code
, name
, 0, &refloc
);
6661 /* If this is the right type of tag, return what we found.
6662 (This reference will be shadowed by shadow_tag later if appropriate.)
6663 If this is the wrong type of tag, do not return it. If it was the
6664 wrong type in the same scope, we will have had an error
6665 message already; if in a different scope and declaring
6666 a name, pending_xref_error will give an error message; but if in a
6667 different scope and not declaring a name, this tag should
6668 shadow the previous declaration of a different type of tag, and
6669 this would not work properly if we return the reference found.
6670 (For example, with "struct foo" in an outer scope, "union foo;"
6671 must shadow that tag with a new one of union type.) */
6672 ret
.kind
= (ref
? ctsk_tagref
: ctsk_tagfirstref
);
6673 if (ref
&& TREE_CODE (ref
) == code
)
6675 if (C_TYPE_DEFINED_IN_STRUCT (ref
)
6676 && loc
!= UNKNOWN_LOCATION
6682 warning_at (loc
, OPT_Wc___compat
,
6683 ("enum type defined in struct or union "
6684 "is not visible in C++"));
6685 inform (refloc
, "enum type defined here");
6688 warning_at (loc
, OPT_Wc___compat
,
6689 ("struct defined in struct or union "
6690 "is not visible in C++"));
6691 inform (refloc
, "struct defined here");
6694 warning_at (loc
, OPT_Wc___compat
,
6695 ("union defined in struct or union "
6696 "is not visible in C++"));
6697 inform (refloc
, "union defined here");
6708 /* If no such tag is yet defined, create a forward-reference node
6709 and record it as the "definition".
6710 When a real declaration of this type is found,
6711 the forward-reference will be altered into a real type. */
6713 ref
= make_node (code
);
6714 if (code
== ENUMERAL_TYPE
)
6716 /* Give the type a default layout like unsigned int
6717 to avoid crashing if it does not get defined. */
6718 SET_TYPE_MODE (ref
, TYPE_MODE (unsigned_type_node
));
6719 TYPE_ALIGN (ref
) = TYPE_ALIGN (unsigned_type_node
);
6720 TYPE_USER_ALIGN (ref
) = 0;
6721 TYPE_UNSIGNED (ref
) = 1;
6722 TYPE_PRECISION (ref
) = TYPE_PRECISION (unsigned_type_node
);
6723 TYPE_MIN_VALUE (ref
) = TYPE_MIN_VALUE (unsigned_type_node
);
6724 TYPE_MAX_VALUE (ref
) = TYPE_MAX_VALUE (unsigned_type_node
);
6727 pushtag (loc
, name
, ref
);
6733 /* Get the struct, enum or union (CODE says which) with tag NAME.
6734 Define the tag as a forward-reference if it is not defined.
6735 Return a tree for the type. */
6738 xref_tag (enum tree_code code
, tree name
)
6740 return parser_xref_tag (input_location
, code
, name
).spec
;
6743 /* Make sure that the tag NAME is defined *in the current scope*
6744 at least as a forward reference.
6745 LOC is the location of the struct's definition.
6746 CODE says which kind of tag NAME ought to be.
6748 This stores the current value of the file static STRUCT_PARSE_INFO
6749 in *ENCLOSING_STRUCT_PARSE_INFO, and points STRUCT_PARSE_INFO at a
6750 new c_struct_parse_info structure. The old value of
6751 STRUCT_PARSE_INFO is restored in finish_struct. */
6754 start_struct (location_t loc
, enum tree_code code
, tree name
,
6755 struct c_struct_parse_info
**enclosing_struct_parse_info
)
6757 /* If there is already a tag defined at this scope
6758 (as a forward reference), just return it. */
6760 tree ref
= NULL_TREE
;
6761 location_t refloc
= UNKNOWN_LOCATION
;
6763 if (name
!= NULL_TREE
)
6764 ref
= lookup_tag (code
, name
, 1, &refloc
);
6765 if (ref
&& TREE_CODE (ref
) == code
)
6767 if (TYPE_SIZE (ref
))
6769 if (code
== UNION_TYPE
)
6770 error_at (loc
, "redefinition of %<union %E%>", name
);
6772 error_at (loc
, "redefinition of %<struct %E%>", name
);
6773 if (refloc
!= UNKNOWN_LOCATION
)
6774 inform (refloc
, "originally defined here");
6775 /* Don't create structures using a name already in use. */
6778 else if (C_TYPE_BEING_DEFINED (ref
))
6780 if (code
== UNION_TYPE
)
6781 error_at (loc
, "nested redefinition of %<union %E%>", name
);
6783 error_at (loc
, "nested redefinition of %<struct %E%>", name
);
6784 /* Don't bother to report "originally defined here" for a
6785 nested redefinition; the original definition should be
6787 /* Don't create structures that contain themselves. */
6792 /* Otherwise create a forward-reference just so the tag is in scope. */
6794 if (ref
== NULL_TREE
|| TREE_CODE (ref
) != code
)
6796 ref
= make_node (code
);
6797 pushtag (loc
, name
, ref
);
6800 C_TYPE_BEING_DEFINED (ref
) = 1;
6801 TYPE_PACKED (ref
) = flag_pack_struct
;
6803 *enclosing_struct_parse_info
= struct_parse_info
;
6804 struct_parse_info
= XNEW (struct c_struct_parse_info
);
6805 struct_parse_info
->struct_types
= VEC_alloc (tree
, heap
, 0);
6806 struct_parse_info
->fields
= VEC_alloc (c_binding_ptr
, heap
, 0);
6807 struct_parse_info
->typedefs_seen
= VEC_alloc (tree
, heap
, 0);
6809 /* FIXME: This will issue a warning for a use of a type defined
6810 within a statement expr used within sizeof, et. al. This is not
6811 terribly serious as C++ doesn't permit statement exprs within
6813 if (warn_cxx_compat
&& (in_sizeof
|| in_typeof
|| in_alignof
))
6814 warning_at (loc
, OPT_Wc___compat
,
6815 "defining type in %qs expression is invalid in C++",
6818 : (in_typeof
? "typeof" : "alignof")));
6823 /* Process the specs, declarator and width (NULL if omitted)
6824 of a structure component, returning a FIELD_DECL node.
6825 WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node.
6826 DECL_ATTRS is as for grokdeclarator.
6828 LOC is the location of the structure component.
6830 This is done during the parsing of the struct declaration.
6831 The FIELD_DECL nodes are chained together and the lot of them
6832 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
6835 grokfield (location_t loc
,
6836 struct c_declarator
*declarator
, struct c_declspecs
*declspecs
,
6837 tree width
, tree
*decl_attrs
)
6841 if (declarator
->kind
== cdk_id
&& declarator
->u
.id
== NULL_TREE
6842 && width
== NULL_TREE
)
6844 /* This is an unnamed decl.
6846 If we have something of the form "union { list } ;" then this
6847 is the anonymous union extension. Similarly for struct.
6849 If this is something of the form "struct foo;", then
6850 If MS or Plan 9 extensions are enabled, this is handled as
6851 an anonymous struct.
6852 Otherwise this is a forward declaration of a structure tag.
6854 If this is something of the form "foo;" and foo is a TYPE_DECL, then
6855 If foo names a structure or union without a tag, then this
6856 is an anonymous struct (this is permitted by C1X).
6857 If MS or Plan 9 extensions are enabled and foo names a
6858 structure, then again this is an anonymous struct.
6859 Otherwise this is an error.
6861 Oh what a horrid tangled web we weave. I wonder if MS consciously
6862 took this from Plan 9 or if it was an accident of implementation
6863 that took root before someone noticed the bug... */
6865 tree type
= declspecs
->type
;
6866 bool type_ok
= (TREE_CODE (type
) == RECORD_TYPE
6867 || TREE_CODE (type
) == UNION_TYPE
);
6871 && (flag_ms_extensions
6872 || flag_plan9_extensions
6873 || !declspecs
->typedef_p
))
6875 if (flag_ms_extensions
|| flag_plan9_extensions
)
6877 else if (TYPE_NAME (type
) == NULL
)
6884 pedwarn (loc
, 0, "declaration does not declare anything");
6890 pedwarn (loc
, OPT_pedantic
,
6891 "ISO C99 doesn%'t support unnamed structs/unions");
6893 pedwarn (loc
, OPT_pedantic
,
6894 "ISO C90 doesn%'t support unnamed structs/unions");
6898 value
= grokdeclarator (declarator
, declspecs
, FIELD
, false,
6899 width
? &width
: NULL
, decl_attrs
, NULL
, NULL
,
6902 finish_decl (value
, loc
, NULL_TREE
, NULL_TREE
, NULL_TREE
);
6903 DECL_INITIAL (value
) = width
;
6905 if (warn_cxx_compat
&& DECL_NAME (value
) != NULL_TREE
)
6907 /* If we currently have a binding for this field, set the
6908 in_struct field in the binding, so that we warn about lookups
6910 struct c_binding
*b
= I_SYMBOL_BINDING (DECL_NAME (value
));
6913 /* If the in_struct field is not yet set, push it on a list
6914 to be cleared when this struct is finished. */
6917 VEC_safe_push (c_binding_ptr
, heap
,
6918 struct_parse_info
->fields
, b
);
6927 /* Subroutine of detect_field_duplicates: return whether X and Y,
6928 which are both fields in the same struct, have duplicate field
6932 is_duplicate_field (tree x
, tree y
)
6934 if (DECL_NAME (x
) != NULL_TREE
&& DECL_NAME (x
) == DECL_NAME (y
))
6937 /* When using -fplan9-extensions, an anonymous field whose name is a
6938 typedef can duplicate a field name. */
6939 if (flag_plan9_extensions
6940 && (DECL_NAME (x
) == NULL_TREE
|| DECL_NAME (y
) == NULL_TREE
))
6942 tree xt
, xn
, yt
, yn
;
6945 if (DECL_NAME (x
) != NULL_TREE
)
6947 else if ((TREE_CODE (xt
) == RECORD_TYPE
|| TREE_CODE (xt
) == UNION_TYPE
)
6948 && TYPE_NAME (xt
) != NULL_TREE
6949 && TREE_CODE (TYPE_NAME (xt
)) == TYPE_DECL
)
6950 xn
= DECL_NAME (TYPE_NAME (xt
));
6955 if (DECL_NAME (y
) != NULL_TREE
)
6957 else if ((TREE_CODE (yt
) == RECORD_TYPE
|| TREE_CODE (yt
) == UNION_TYPE
)
6958 && TYPE_NAME (yt
) != NULL_TREE
6959 && TREE_CODE (TYPE_NAME (yt
)) == TYPE_DECL
)
6960 yn
= DECL_NAME (TYPE_NAME (yt
));
6964 if (xn
!= NULL_TREE
&& xn
== yn
)
6971 /* Subroutine of detect_field_duplicates: add the fields of FIELDLIST
6972 to HTAB, giving errors for any duplicates. */
6975 detect_field_duplicates_hash (tree fieldlist
, htab_t htab
)
6980 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
6981 if ((y
= DECL_NAME (x
)) != 0)
6983 slot
= htab_find_slot (htab
, y
, INSERT
);
6986 error ("duplicate member %q+D", x
);
6987 DECL_NAME (x
) = NULL_TREE
;
6991 else if (TREE_CODE (TREE_TYPE (x
)) == RECORD_TYPE
6992 || TREE_CODE (TREE_TYPE (x
)) == UNION_TYPE
)
6994 detect_field_duplicates_hash (TYPE_FIELDS (TREE_TYPE (x
)), htab
);
6996 /* When using -fplan9-extensions, an anonymous field whose
6997 name is a typedef can duplicate a field name. */
6998 if (flag_plan9_extensions
6999 && TYPE_NAME (TREE_TYPE (x
)) != NULL_TREE
7000 && TREE_CODE (TYPE_NAME (TREE_TYPE (x
))) == TYPE_DECL
)
7002 tree xn
= DECL_NAME (TYPE_NAME (TREE_TYPE (x
)));
7003 slot
= htab_find_slot (htab
, xn
, INSERT
);
7005 error ("duplicate member %q+D", TYPE_NAME (TREE_TYPE (x
)));
7011 /* Generate an error for any duplicate field names in FIELDLIST. Munge
7012 the list such that this does not present a problem later. */
7015 detect_field_duplicates (tree fieldlist
)
7020 /* If the struct is the list of instance variables of an Objective-C
7021 class, then we need to check all the instance variables of
7022 superclasses when checking for duplicates (since you can't have
7023 an instance variable in a subclass with the same name as an
7024 instance variable in a superclass). We pass on this job to the
7025 Objective-C compiler. objc_detect_field_duplicates() will return
7026 false if we are not checking the list of instance variables and
7027 the C frontend should proceed with the standard field duplicate
7028 checks. If we are checking the list of instance variables, the
7029 ObjC frontend will do the check, emit the errors if needed, and
7030 then return true. */
7031 if (c_dialect_objc ())
7032 if (objc_detect_field_duplicates (false))
7035 /* First, see if there are more than "a few" fields.
7036 This is trivially true if there are zero or one fields. */
7037 if (!fieldlist
|| !DECL_CHAIN (fieldlist
))
7042 if (DECL_NAME (x
) == NULL_TREE
7043 && (TREE_CODE (TREE_TYPE (x
)) == RECORD_TYPE
7044 || TREE_CODE (TREE_TYPE (x
)) == UNION_TYPE
))
7047 } while (timeout
> 0 && x
);
7049 /* If there were "few" fields and no anonymous structures or unions,
7050 avoid the overhead of allocating a hash table. Instead just do
7051 the nested traversal thing. */
7054 for (x
= DECL_CHAIN (fieldlist
); x
; x
= DECL_CHAIN (x
))
7055 /* When using -fplan9-extensions, we can have duplicates
7056 between typedef names and fields. */
7058 || (flag_plan9_extensions
7059 && DECL_NAME (x
) == NULL_TREE
7060 && (TREE_CODE (TREE_TYPE (x
)) == RECORD_TYPE
7061 || TREE_CODE (TREE_TYPE (x
)) == UNION_TYPE
)
7062 && TYPE_NAME (TREE_TYPE (x
)) != NULL_TREE
7063 && TREE_CODE (TYPE_NAME (TREE_TYPE (x
))) == TYPE_DECL
))
7065 for (y
= fieldlist
; y
!= x
; y
= TREE_CHAIN (y
))
7066 if (is_duplicate_field (y
, x
))
7068 error ("duplicate member %q+D", x
);
7069 DECL_NAME (x
) = NULL_TREE
;
7075 htab_t htab
= htab_create (37, htab_hash_pointer
, htab_eq_pointer
, NULL
);
7077 detect_field_duplicates_hash (fieldlist
, htab
);
7082 /* Finish up struct info used by -Wc++-compat. */
7085 warn_cxx_compat_finish_struct (tree fieldlist
)
7089 struct c_binding
*b
;
7091 /* Set the C_TYPE_DEFINED_IN_STRUCT flag for each type defined in
7092 the current struct. We do this now at the end of the struct
7093 because the flag is used to issue visibility warnings, and we
7094 only want to issue those warnings if the type is referenced
7095 outside of the struct declaration. */
7096 FOR_EACH_VEC_ELT (tree
, struct_parse_info
->struct_types
, ix
, x
)
7097 C_TYPE_DEFINED_IN_STRUCT (x
) = 1;
7099 /* The TYPEDEFS_SEEN field of STRUCT_PARSE_INFO is a list of
7100 typedefs used when declaring fields in this struct. If the name
7101 of any of the fields is also a typedef name then the struct would
7102 not parse in C++, because the C++ lookup rules say that the
7103 typedef name would be looked up in the context of the struct, and
7104 would thus be the field rather than the typedef. */
7105 if (!VEC_empty (tree
, struct_parse_info
->typedefs_seen
)
7106 && fieldlist
!= NULL_TREE
)
7108 /* Use a pointer_set using the name of the typedef. We can use
7109 a pointer_set because identifiers are interned. */
7110 struct pointer_set_t
*tset
= pointer_set_create ();
7112 FOR_EACH_VEC_ELT (tree
, struct_parse_info
->typedefs_seen
, ix
, x
)
7113 pointer_set_insert (tset
, DECL_NAME (x
));
7115 for (x
= fieldlist
; x
!= NULL_TREE
; x
= DECL_CHAIN (x
))
7117 if (DECL_NAME (x
) != NULL_TREE
7118 && pointer_set_contains (tset
, DECL_NAME (x
)))
7120 warning_at (DECL_SOURCE_LOCATION (x
), OPT_Wc___compat
,
7121 ("using %qD as both field and typedef name is "
7124 /* FIXME: It would be nice to report the location where
7125 the typedef name is used. */
7129 pointer_set_destroy (tset
);
7132 /* For each field which has a binding and which was not defined in
7133 an enclosing struct, clear the in_struct field. */
7134 FOR_EACH_VEC_ELT (c_binding_ptr
, struct_parse_info
->fields
, ix
, b
)
7138 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
7139 LOC is the location of the RECORD_TYPE or UNION_TYPE's definition.
7140 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
7141 ATTRIBUTES are attributes to be applied to the structure.
7143 ENCLOSING_STRUCT_PARSE_INFO is the value of STRUCT_PARSE_INFO when
7144 the struct was started. */
7147 finish_struct (location_t loc
, tree t
, tree fieldlist
, tree attributes
,
7148 struct c_struct_parse_info
*enclosing_struct_parse_info
)
7151 bool toplevel
= file_scope
== current_scope
;
7152 int saw_named_field
;
7154 /* If this type was previously laid out as a forward reference,
7155 make sure we lay it out again. */
7159 decl_attributes (&t
, attributes
, (int) ATTR_FLAG_TYPE_IN_PLACE
);
7163 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
7165 if (DECL_NAME (x
) != 0)
7168 && (TREE_CODE (TREE_TYPE (x
)) == RECORD_TYPE
7169 || TREE_CODE (TREE_TYPE (x
)) == UNION_TYPE
))
7175 if (TREE_CODE (t
) == UNION_TYPE
)
7178 pedwarn (loc
, OPT_pedantic
, "union has no named members");
7180 pedwarn (loc
, OPT_pedantic
, "union has no members");
7185 pedwarn (loc
, OPT_pedantic
, "struct has no named members");
7187 pedwarn (loc
, OPT_pedantic
, "struct has no members");
7192 /* Install struct as DECL_CONTEXT of each field decl.
7193 Also process specified field sizes, found in the DECL_INITIAL,
7194 storing 0 there after the type has been changed to precision equal
7195 to its width, rather than the precision of the specified standard
7196 type. (Correct layout requires the original type to have been preserved
7199 saw_named_field
= 0;
7200 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
7202 if (TREE_TYPE (x
) == error_mark_node
)
7205 DECL_CONTEXT (x
) = t
;
7207 /* If any field is const, the structure type is pseudo-const. */
7208 if (TREE_READONLY (x
))
7209 C_TYPE_FIELDS_READONLY (t
) = 1;
7212 /* A field that is pseudo-const makes the structure likewise. */
7213 tree t1
= strip_array_types (TREE_TYPE (x
));
7214 if ((TREE_CODE (t1
) == RECORD_TYPE
|| TREE_CODE (t1
) == UNION_TYPE
)
7215 && C_TYPE_FIELDS_READONLY (t1
))
7216 C_TYPE_FIELDS_READONLY (t
) = 1;
7219 /* Any field that is volatile means variables of this type must be
7220 treated in some ways as volatile. */
7221 if (TREE_THIS_VOLATILE (x
))
7222 C_TYPE_FIELDS_VOLATILE (t
) = 1;
7224 /* Any field of nominal variable size implies structure is too. */
7225 if (C_DECL_VARIABLE_SIZE (x
))
7226 C_TYPE_VARIABLE_SIZE (t
) = 1;
7228 if (DECL_INITIAL (x
))
7230 unsigned HOST_WIDE_INT width
= tree_low_cst (DECL_INITIAL (x
), 1);
7231 DECL_SIZE (x
) = bitsize_int (width
);
7232 DECL_BIT_FIELD (x
) = 1;
7233 SET_DECL_C_BIT_FIELD (x
);
7237 && (DECL_BIT_FIELD (x
)
7238 || TYPE_ALIGN (TREE_TYPE (x
)) > BITS_PER_UNIT
))
7239 DECL_PACKED (x
) = 1;
7241 /* Detect flexible array member in an invalid context. */
7242 if (TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
7243 && TYPE_SIZE (TREE_TYPE (x
)) == NULL_TREE
7244 && TYPE_DOMAIN (TREE_TYPE (x
)) != NULL_TREE
7245 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x
))) == NULL_TREE
)
7247 if (TREE_CODE (t
) == UNION_TYPE
)
7249 error_at (DECL_SOURCE_LOCATION (x
),
7250 "flexible array member in union");
7251 TREE_TYPE (x
) = error_mark_node
;
7253 else if (DECL_CHAIN (x
) != NULL_TREE
)
7255 error_at (DECL_SOURCE_LOCATION (x
),
7256 "flexible array member not at end of struct");
7257 TREE_TYPE (x
) = error_mark_node
;
7259 else if (!saw_named_field
)
7261 error_at (DECL_SOURCE_LOCATION (x
),
7262 "flexible array member in otherwise empty struct");
7263 TREE_TYPE (x
) = error_mark_node
;
7267 if (pedantic
&& TREE_CODE (t
) == RECORD_TYPE
7268 && flexible_array_type_p (TREE_TYPE (x
)))
7269 pedwarn (DECL_SOURCE_LOCATION (x
), OPT_pedantic
,
7270 "invalid use of structure with flexible array member");
7273 || TREE_CODE (TREE_TYPE (x
)) == RECORD_TYPE
7274 || TREE_CODE (TREE_TYPE (x
)) == UNION_TYPE
)
7275 saw_named_field
= 1;
7278 detect_field_duplicates (fieldlist
);
7280 /* Now we have the nearly final fieldlist. Record it,
7281 then lay out the structure or union (including the fields). */
7283 TYPE_FIELDS (t
) = fieldlist
;
7287 /* Give bit-fields their proper types. */
7289 tree
*fieldlistp
= &fieldlist
;
7291 if (TREE_CODE (*fieldlistp
) == FIELD_DECL
&& DECL_INITIAL (*fieldlistp
)
7292 && TREE_TYPE (*fieldlistp
) != error_mark_node
)
7294 unsigned HOST_WIDE_INT width
7295 = tree_low_cst (DECL_INITIAL (*fieldlistp
), 1);
7296 tree type
= TREE_TYPE (*fieldlistp
);
7297 if (width
!= TYPE_PRECISION (type
))
7299 TREE_TYPE (*fieldlistp
)
7300 = c_build_bitfield_integer_type (width
, TYPE_UNSIGNED (type
));
7301 DECL_MODE (*fieldlistp
) = TYPE_MODE (TREE_TYPE (*fieldlistp
));
7303 DECL_INITIAL (*fieldlistp
) = 0;
7306 fieldlistp
= &DECL_CHAIN (*fieldlistp
);
7309 /* Now we have the truly final field list.
7310 Store it in this type and in the variants. */
7312 TYPE_FIELDS (t
) = fieldlist
;
7314 /* If there are lots of fields, sort so we can look through them fast.
7315 We arbitrarily consider 16 or more elts to be "a lot". */
7320 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
7322 if (len
> 15 || DECL_NAME (x
) == NULL
)
7330 struct lang_type
*space
;
7331 struct sorted_fields_type
*space2
;
7333 len
+= list_length (x
);
7335 /* Use the same allocation policy here that make_node uses, to
7336 ensure that this lives as long as the rest of the struct decl.
7337 All decls in an inline function need to be saved. */
7339 space
= ggc_alloc_cleared_lang_type (sizeof (struct lang_type
));
7340 space2
= ggc_alloc_sorted_fields_type
7341 (sizeof (struct sorted_fields_type
) + len
* sizeof (tree
));
7345 field_array
= &space2
->elts
[0];
7346 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
7348 field_array
[len
++] = x
;
7350 /* If there is anonymous struct or union, break out of the loop. */
7351 if (DECL_NAME (x
) == NULL
)
7354 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
7357 TYPE_LANG_SPECIFIC (t
) = space
;
7358 TYPE_LANG_SPECIFIC (t
)->s
->len
= len
;
7359 field_array
= TYPE_LANG_SPECIFIC (t
)->s
->elts
;
7360 qsort (field_array
, len
, sizeof (tree
), field_decl_cmp
);
7365 for (x
= TYPE_MAIN_VARIANT (t
); x
; x
= TYPE_NEXT_VARIANT (x
))
7367 TYPE_FIELDS (x
) = TYPE_FIELDS (t
);
7368 TYPE_LANG_SPECIFIC (x
) = TYPE_LANG_SPECIFIC (t
);
7369 C_TYPE_FIELDS_READONLY (x
) = C_TYPE_FIELDS_READONLY (t
);
7370 C_TYPE_FIELDS_VOLATILE (x
) = C_TYPE_FIELDS_VOLATILE (t
);
7371 C_TYPE_VARIABLE_SIZE (x
) = C_TYPE_VARIABLE_SIZE (t
);
7374 /* If this was supposed to be a transparent union, but we can't
7375 make it one, warn and turn off the flag. */
7376 if (TREE_CODE (t
) == UNION_TYPE
7377 && TYPE_TRANSPARENT_AGGR (t
)
7378 && (!TYPE_FIELDS (t
) || TYPE_MODE (t
) != DECL_MODE (TYPE_FIELDS (t
))))
7380 TYPE_TRANSPARENT_AGGR (t
) = 0;
7381 warning_at (loc
, 0, "union cannot be made transparent");
7384 /* If this structure or union completes the type of any previous
7385 variable declaration, lay it out and output its rtl. */
7386 for (x
= C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t
));
7390 tree decl
= TREE_VALUE (x
);
7391 if (TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
)
7392 layout_array_type (TREE_TYPE (decl
));
7393 if (TREE_CODE (decl
) != TYPE_DECL
)
7395 layout_decl (decl
, 0);
7396 if (c_dialect_objc ())
7397 objc_check_decl (decl
);
7398 rest_of_decl_compilation (decl
, toplevel
, 0);
7403 C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t
)) = 0;
7405 /* Update type location to the one of the definition, instead of e.g.
7406 a forward declaration. */
7407 if (TYPE_STUB_DECL (t
))
7408 DECL_SOURCE_LOCATION (TYPE_STUB_DECL (t
)) = loc
;
7410 /* Finish debugging output for this type. */
7411 rest_of_type_compilation (t
, toplevel
);
7413 /* If we're inside a function proper, i.e. not file-scope and not still
7414 parsing parameters, then arrange for the size of a variable sized type
7416 if (building_stmt_list_p () && variably_modified_type_p (t
, NULL_TREE
))
7417 add_stmt (build_stmt (loc
,
7418 DECL_EXPR
, build_decl (loc
, TYPE_DECL
, NULL
, t
)));
7420 if (warn_cxx_compat
)
7421 warn_cxx_compat_finish_struct (fieldlist
);
7423 VEC_free (tree
, heap
, struct_parse_info
->struct_types
);
7424 VEC_free (c_binding_ptr
, heap
, struct_parse_info
->fields
);
7425 VEC_free (tree
, heap
, struct_parse_info
->typedefs_seen
);
7426 XDELETE (struct_parse_info
);
7428 struct_parse_info
= enclosing_struct_parse_info
;
7430 /* If this struct is defined inside a struct, add it to
7433 && struct_parse_info
!= NULL
7434 && !in_sizeof
&& !in_typeof
&& !in_alignof
)
7435 VEC_safe_push (tree
, heap
, struct_parse_info
->struct_types
, t
);
7440 /* Lay out the type T, and its element type, and so on. */
7443 layout_array_type (tree t
)
7445 if (TREE_CODE (TREE_TYPE (t
)) == ARRAY_TYPE
)
7446 layout_array_type (TREE_TYPE (t
));
7450 /* Begin compiling the definition of an enumeration type.
7451 NAME is its name (or null if anonymous).
7452 LOC is the enum's location.
7453 Returns the type object, as yet incomplete.
7454 Also records info about it so that build_enumerator
7455 may be used to declare the individual values as they are read. */
7458 start_enum (location_t loc
, struct c_enum_contents
*the_enum
, tree name
)
7460 tree enumtype
= NULL_TREE
;
7461 location_t enumloc
= UNKNOWN_LOCATION
;
7463 /* If this is the real definition for a previous forward reference,
7464 fill in the contents in the same object that used to be the
7465 forward reference. */
7467 if (name
!= NULL_TREE
)
7468 enumtype
= lookup_tag (ENUMERAL_TYPE
, name
, 1, &enumloc
);
7470 if (enumtype
== 0 || TREE_CODE (enumtype
) != ENUMERAL_TYPE
)
7472 enumtype
= make_node (ENUMERAL_TYPE
);
7473 pushtag (loc
, name
, enumtype
);
7476 if (C_TYPE_BEING_DEFINED (enumtype
))
7477 error_at (loc
, "nested redefinition of %<enum %E%>", name
);
7479 C_TYPE_BEING_DEFINED (enumtype
) = 1;
7481 if (TYPE_VALUES (enumtype
) != 0)
7483 /* This enum is a named one that has been declared already. */
7484 error_at (loc
, "redeclaration of %<enum %E%>", name
);
7485 if (enumloc
!= UNKNOWN_LOCATION
)
7486 inform (enumloc
, "originally defined here");
7488 /* Completely replace its old definition.
7489 The old enumerators remain defined, however. */
7490 TYPE_VALUES (enumtype
) = 0;
7493 the_enum
->enum_next_value
= integer_zero_node
;
7494 the_enum
->enum_overflow
= 0;
7496 if (flag_short_enums
)
7497 TYPE_PACKED (enumtype
) = 1;
7499 /* FIXME: This will issue a warning for a use of a type defined
7500 within sizeof in a statement expr. This is not terribly serious
7501 as C++ doesn't permit statement exprs within sizeof anyhow. */
7502 if (warn_cxx_compat
&& (in_sizeof
|| in_typeof
|| in_alignof
))
7503 warning_at (loc
, OPT_Wc___compat
,
7504 "defining type in %qs expression is invalid in C++",
7507 : (in_typeof
? "typeof" : "alignof")));
7512 /* After processing and defining all the values of an enumeration type,
7513 install their decls in the enumeration type and finish it off.
7514 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
7515 and ATTRIBUTES are the specified attributes.
7516 Returns ENUMTYPE. */
7519 finish_enum (tree enumtype
, tree values
, tree attributes
)
7522 tree minnode
= 0, maxnode
= 0;
7523 int precision
, unsign
;
7524 bool toplevel
= (file_scope
== current_scope
);
7525 struct lang_type
*lt
;
7527 decl_attributes (&enumtype
, attributes
, (int) ATTR_FLAG_TYPE_IN_PLACE
);
7529 /* Calculate the maximum value of any enumerator in this type. */
7531 if (values
== error_mark_node
)
7532 minnode
= maxnode
= integer_zero_node
;
7535 minnode
= maxnode
= TREE_VALUE (values
);
7536 for (pair
= TREE_CHAIN (values
); pair
; pair
= TREE_CHAIN (pair
))
7538 tree value
= TREE_VALUE (pair
);
7539 if (tree_int_cst_lt (maxnode
, value
))
7541 if (tree_int_cst_lt (value
, minnode
))
7546 /* Construct the final type of this enumeration. It is the same
7547 as one of the integral types - the narrowest one that fits, except
7548 that normally we only go as narrow as int - and signed iff any of
7549 the values are negative. */
7550 unsign
= (tree_int_cst_sgn (minnode
) >= 0);
7551 precision
= MAX (tree_int_cst_min_precision (minnode
, unsign
),
7552 tree_int_cst_min_precision (maxnode
, unsign
));
7554 if (TYPE_PACKED (enumtype
) || precision
> TYPE_PRECISION (integer_type_node
))
7556 tem
= c_common_type_for_size (precision
, unsign
);
7559 warning (0, "enumeration values exceed range of largest integer");
7560 tem
= long_long_integer_type_node
;
7564 tem
= unsign
? unsigned_type_node
: integer_type_node
;
7566 TYPE_MIN_VALUE (enumtype
) = TYPE_MIN_VALUE (tem
);
7567 TYPE_MAX_VALUE (enumtype
) = TYPE_MAX_VALUE (tem
);
7568 TYPE_UNSIGNED (enumtype
) = TYPE_UNSIGNED (tem
);
7569 TYPE_SIZE (enumtype
) = 0;
7571 /* If the precision of the type was specific with an attribute and it
7572 was too small, give an error. Otherwise, use it. */
7573 if (TYPE_PRECISION (enumtype
))
7575 if (precision
> TYPE_PRECISION (enumtype
))
7576 error ("specified mode too small for enumeral values");
7579 TYPE_PRECISION (enumtype
) = TYPE_PRECISION (tem
);
7581 layout_type (enumtype
);
7583 if (values
!= error_mark_node
)
7585 /* Change the type of the enumerators to be the enum type. We
7586 need to do this irrespective of the size of the enum, for
7587 proper type checking. Replace the DECL_INITIALs of the
7588 enumerators, and the value slots of the list, with copies
7589 that have the enum type; they cannot be modified in place
7590 because they may be shared (e.g. integer_zero_node) Finally,
7591 change the purpose slots to point to the names of the decls. */
7592 for (pair
= values
; pair
; pair
= TREE_CHAIN (pair
))
7594 tree enu
= TREE_PURPOSE (pair
);
7595 tree ini
= DECL_INITIAL (enu
);
7597 TREE_TYPE (enu
) = enumtype
;
7599 /* The ISO C Standard mandates enumerators to have type int,
7600 even though the underlying type of an enum type is
7601 unspecified. However, GCC allows enumerators of any
7602 integer type as an extensions. build_enumerator()
7603 converts any enumerators that fit in an int to type int,
7604 to avoid promotions to unsigned types when comparing
7605 integers with enumerators that fit in the int range.
7606 When -pedantic is given, build_enumerator() would have
7607 already warned about those that don't fit. Here we
7608 convert the rest to the enumerator type. */
7609 if (TREE_TYPE (ini
) != integer_type_node
)
7610 ini
= convert (enumtype
, ini
);
7612 DECL_INITIAL (enu
) = ini
;
7613 TREE_PURPOSE (pair
) = DECL_NAME (enu
);
7614 TREE_VALUE (pair
) = ini
;
7617 TYPE_VALUES (enumtype
) = values
;
7620 /* Record the min/max values so that we can warn about bit-field
7621 enumerations that are too small for the values. */
7622 lt
= ggc_alloc_cleared_lang_type (sizeof (struct lang_type
));
7623 lt
->enum_min
= minnode
;
7624 lt
->enum_max
= maxnode
;
7625 TYPE_LANG_SPECIFIC (enumtype
) = lt
;
7627 /* Fix up all variant types of this enum type. */
7628 for (tem
= TYPE_MAIN_VARIANT (enumtype
); tem
; tem
= TYPE_NEXT_VARIANT (tem
))
7630 if (tem
== enumtype
)
7632 TYPE_VALUES (tem
) = TYPE_VALUES (enumtype
);
7633 TYPE_MIN_VALUE (tem
) = TYPE_MIN_VALUE (enumtype
);
7634 TYPE_MAX_VALUE (tem
) = TYPE_MAX_VALUE (enumtype
);
7635 TYPE_SIZE (tem
) = TYPE_SIZE (enumtype
);
7636 TYPE_SIZE_UNIT (tem
) = TYPE_SIZE_UNIT (enumtype
);
7637 SET_TYPE_MODE (tem
, TYPE_MODE (enumtype
));
7638 TYPE_PRECISION (tem
) = TYPE_PRECISION (enumtype
);
7639 TYPE_ALIGN (tem
) = TYPE_ALIGN (enumtype
);
7640 TYPE_USER_ALIGN (tem
) = TYPE_USER_ALIGN (enumtype
);
7641 TYPE_UNSIGNED (tem
) = TYPE_UNSIGNED (enumtype
);
7642 TYPE_LANG_SPECIFIC (tem
) = TYPE_LANG_SPECIFIC (enumtype
);
7645 /* Finish debugging output for this type. */
7646 rest_of_type_compilation (enumtype
, toplevel
);
7648 /* If this enum is defined inside a struct, add it to
7651 && struct_parse_info
!= NULL
7652 && !in_sizeof
&& !in_typeof
&& !in_alignof
)
7653 VEC_safe_push (tree
, heap
, struct_parse_info
->struct_types
, enumtype
);
7658 /* Build and install a CONST_DECL for one value of the
7659 current enumeration type (one that was begun with start_enum).
7660 DECL_LOC is the location of the enumerator.
7661 LOC is the location of the '=' operator if any, DECL_LOC otherwise.
7662 Return a tree-list containing the CONST_DECL and its value.
7663 Assignment of sequential values by default is handled here. */
7666 build_enumerator (location_t decl_loc
, location_t loc
,
7667 struct c_enum_contents
*the_enum
, tree name
, tree value
)
7671 /* Validate and default VALUE. */
7675 /* Don't issue more errors for error_mark_node (i.e. an
7676 undeclared identifier) - just ignore the value expression. */
7677 if (value
== error_mark_node
)
7679 else if (!INTEGRAL_TYPE_P (TREE_TYPE (value
)))
7681 error_at (loc
, "enumerator value for %qE is not an integer constant",
7687 if (TREE_CODE (value
) != INTEGER_CST
)
7689 value
= c_fully_fold (value
, false, NULL
);
7690 if (TREE_CODE (value
) == INTEGER_CST
)
7691 pedwarn (loc
, OPT_pedantic
,
7692 "enumerator value for %qE is not an integer "
7693 "constant expression", name
);
7695 if (TREE_CODE (value
) != INTEGER_CST
)
7697 error ("enumerator value for %qE is not an integer constant",
7703 value
= default_conversion (value
);
7704 constant_expression_warning (value
);
7709 /* Default based on previous value. */
7710 /* It should no longer be possible to have NON_LVALUE_EXPR
7714 value
= the_enum
->enum_next_value
;
7715 if (the_enum
->enum_overflow
)
7716 error_at (loc
, "overflow in enumeration values");
7718 /* Even though the underlying type of an enum is unspecified, the
7719 type of enumeration constants is explicitly defined as int
7720 (6.4.4.3/2 in the C99 Standard). GCC allows any integer type as
7722 else if (!int_fits_type_p (value
, integer_type_node
))
7723 pedwarn (loc
, OPT_pedantic
,
7724 "ISO C restricts enumerator values to range of %<int%>");
7726 /* The ISO C Standard mandates enumerators to have type int, even
7727 though the underlying type of an enum type is unspecified.
7728 However, GCC allows enumerators of any integer type as an
7729 extensions. Here we convert any enumerators that fit in an int
7730 to type int, to avoid promotions to unsigned types when comparing
7731 integers with enumerators that fit in the int range. When
7732 -pedantic is given, we would have already warned about those that
7733 don't fit. We have to do this here rather than in finish_enum
7734 because this value may be used to define more enumerators. */
7735 if (int_fits_type_p (value
, integer_type_node
))
7736 value
= convert (integer_type_node
, value
);
7738 /* Set basis for default for next value. */
7739 the_enum
->enum_next_value
7740 = build_binary_op (EXPR_LOC_OR_HERE (value
),
7741 PLUS_EXPR
, value
, integer_one_node
, 0);
7742 the_enum
->enum_overflow
= tree_int_cst_lt (the_enum
->enum_next_value
, value
);
7744 /* Now create a declaration for the enum value name. */
7746 type
= TREE_TYPE (value
);
7747 type
= c_common_type_for_size (MAX (TYPE_PRECISION (type
),
7748 TYPE_PRECISION (integer_type_node
)),
7749 (TYPE_PRECISION (type
)
7750 >= TYPE_PRECISION (integer_type_node
)
7751 && TYPE_UNSIGNED (type
)));
7753 decl
= build_decl (decl_loc
, CONST_DECL
, name
, type
);
7754 DECL_INITIAL (decl
) = convert (type
, value
);
7757 return tree_cons (decl
, value
, NULL_TREE
);
7761 /* Create the FUNCTION_DECL for a function definition.
7762 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
7763 the declaration; they describe the function's name and the type it returns,
7764 but twisted together in a fashion that parallels the syntax of C.
7766 This function creates a binding context for the function body
7767 as well as setting up the FUNCTION_DECL in current_function_decl.
7769 Returns 1 on success. If the DECLARATOR is not suitable for a function
7770 (it defines a datum instead), we return 0, which tells
7771 yyparse to report a parse error. */
7774 start_function (struct c_declspecs
*declspecs
, struct c_declarator
*declarator
,
7777 tree decl1
, old_decl
;
7778 tree restype
, resdecl
;
7781 current_function_returns_value
= 0; /* Assume, until we see it does. */
7782 current_function_returns_null
= 0;
7783 current_function_returns_abnormally
= 0;
7784 warn_about_return_type
= 0;
7785 c_switch_stack
= NULL
;
7787 /* Indicate no valid break/continue context by setting these variables
7788 to some non-null, non-label value. We'll notice and emit the proper
7789 error message in c_finish_bc_stmt. */
7790 c_break_label
= c_cont_label
= size_zero_node
;
7792 decl1
= grokdeclarator (declarator
, declspecs
, FUNCDEF
, true, NULL
,
7793 &attributes
, NULL
, NULL
, DEPRECATED_NORMAL
);
7795 /* If the declarator is not suitable for a function definition,
7796 cause a syntax error. */
7800 loc
= DECL_SOURCE_LOCATION (decl1
);
7802 decl_attributes (&decl1
, attributes
, 0);
7804 if (DECL_DECLARED_INLINE_P (decl1
)
7805 && DECL_UNINLINABLE (decl1
)
7806 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1
)))
7807 warning_at (loc
, OPT_Wattributes
,
7808 "inline function %qD given attribute noinline",
7811 /* Handle gnu_inline attribute. */
7812 if (declspecs
->inline_p
7813 && !flag_gnu89_inline
7814 && TREE_CODE (decl1
) == FUNCTION_DECL
7815 && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl1
))
7816 || current_function_decl
))
7818 if (declspecs
->storage_class
!= csc_static
)
7819 DECL_EXTERNAL (decl1
) = !DECL_EXTERNAL (decl1
);
7822 announce_function (decl1
);
7824 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1
))))
7826 error_at (loc
, "return type is an incomplete type");
7827 /* Make it return void instead. */
7829 = build_function_type (void_type_node
,
7830 TYPE_ARG_TYPES (TREE_TYPE (decl1
)));
7833 if (warn_about_return_type
)
7834 pedwarn_c99 (loc
, flag_isoc99
? 0
7835 : (warn_return_type
? OPT_Wreturn_type
: OPT_Wimplicit_int
),
7836 "return type defaults to %<int%>");
7838 /* Make the init_value nonzero so pushdecl knows this is not tentative.
7839 error_mark_node is replaced below (in pop_scope) with the BLOCK. */
7840 DECL_INITIAL (decl1
) = error_mark_node
;
7842 /* A nested function is not global. */
7843 if (current_function_decl
!= 0)
7844 TREE_PUBLIC (decl1
) = 0;
7846 /* If this definition isn't a prototype and we had a prototype declaration
7847 before, copy the arg type info from that prototype. */
7848 old_decl
= lookup_name_in_scope (DECL_NAME (decl1
), current_scope
);
7849 if (old_decl
&& TREE_CODE (old_decl
) != FUNCTION_DECL
)
7851 current_function_prototype_locus
= UNKNOWN_LOCATION
;
7852 current_function_prototype_built_in
= false;
7853 current_function_prototype_arg_types
= NULL_TREE
;
7854 if (!prototype_p (TREE_TYPE (decl1
)))
7856 if (old_decl
!= 0 && TREE_CODE (TREE_TYPE (old_decl
)) == FUNCTION_TYPE
7857 && comptypes (TREE_TYPE (TREE_TYPE (decl1
)),
7858 TREE_TYPE (TREE_TYPE (old_decl
))))
7860 TREE_TYPE (decl1
) = composite_type (TREE_TYPE (old_decl
),
7862 current_function_prototype_locus
= DECL_SOURCE_LOCATION (old_decl
);
7863 current_function_prototype_built_in
7864 = C_DECL_BUILTIN_PROTOTYPE (old_decl
);
7865 current_function_prototype_arg_types
7866 = TYPE_ARG_TYPES (TREE_TYPE (decl1
));
7868 if (TREE_PUBLIC (decl1
))
7870 /* If there is an external prototype declaration of this
7871 function, record its location but do not copy information
7872 to this decl. This may be an invisible declaration
7873 (built-in or in a scope which has finished) or simply
7874 have more refined argument types than any declaration
7876 struct c_binding
*b
;
7877 for (b
= I_SYMBOL_BINDING (DECL_NAME (decl1
)); b
; b
= b
->shadowed
)
7878 if (B_IN_SCOPE (b
, external_scope
))
7882 tree ext_decl
, ext_type
;
7884 ext_type
= b
->u
.type
? b
->u
.type
: TREE_TYPE (ext_decl
);
7885 if (TREE_CODE (ext_type
) == FUNCTION_TYPE
7886 && comptypes (TREE_TYPE (TREE_TYPE (decl1
)),
7887 TREE_TYPE (ext_type
)))
7889 current_function_prototype_locus
7890 = DECL_SOURCE_LOCATION (ext_decl
);
7891 current_function_prototype_built_in
7892 = C_DECL_BUILTIN_PROTOTYPE (ext_decl
);
7893 current_function_prototype_arg_types
7894 = TYPE_ARG_TYPES (ext_type
);
7900 /* Optionally warn of old-fashioned def with no previous prototype. */
7901 if (warn_strict_prototypes
7902 && old_decl
!= error_mark_node
7903 && !prototype_p (TREE_TYPE (decl1
))
7904 && C_DECL_ISNT_PROTOTYPE (old_decl
))
7905 warning_at (loc
, OPT_Wstrict_prototypes
,
7906 "function declaration isn%'t a prototype");
7907 /* Optionally warn of any global def with no previous prototype. */
7908 else if (warn_missing_prototypes
7909 && old_decl
!= error_mark_node
7910 && TREE_PUBLIC (decl1
)
7911 && !MAIN_NAME_P (DECL_NAME (decl1
))
7912 && C_DECL_ISNT_PROTOTYPE (old_decl
))
7913 warning_at (loc
, OPT_Wmissing_prototypes
,
7914 "no previous prototype for %qD", decl1
);
7915 /* Optionally warn of any def with no previous prototype
7916 if the function has already been used. */
7917 else if (warn_missing_prototypes
7919 && old_decl
!= error_mark_node
7920 && TREE_USED (old_decl
)
7921 && !prototype_p (TREE_TYPE (old_decl
)))
7922 warning_at (loc
, OPT_Wmissing_prototypes
,
7923 "%qD was used with no prototype before its definition", decl1
);
7924 /* Optionally warn of any global def with no previous declaration. */
7925 else if (warn_missing_declarations
7926 && TREE_PUBLIC (decl1
)
7928 && !MAIN_NAME_P (DECL_NAME (decl1
)))
7929 warning_at (loc
, OPT_Wmissing_declarations
,
7930 "no previous declaration for %qD",
7932 /* Optionally warn of any def with no previous declaration
7933 if the function has already been used. */
7934 else if (warn_missing_declarations
7936 && old_decl
!= error_mark_node
7937 && TREE_USED (old_decl
)
7938 && C_DECL_IMPLICIT (old_decl
))
7939 warning_at (loc
, OPT_Wmissing_declarations
,
7940 "%qD was used with no declaration before its definition", decl1
);
7942 /* This function exists in static storage.
7943 (This does not mean `static' in the C sense!) */
7944 TREE_STATIC (decl1
) = 1;
7946 /* This is the earliest point at which we might know the assembler
7947 name of the function. Thus, if it's set before this, die horribly. */
7948 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl1
));
7950 /* If #pragma weak was used, mark the decl weak now. */
7951 if (current_scope
== file_scope
)
7952 maybe_apply_pragma_weak (decl1
);
7954 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
7955 if (warn_main
&& MAIN_NAME_P (DECL_NAME (decl1
)))
7957 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1
)))
7958 != integer_type_node
)
7959 pedwarn (loc
, OPT_Wmain
, "return type of %qD is not %<int%>", decl1
);
7961 check_main_parameter_types (decl1
);
7963 if (!TREE_PUBLIC (decl1
))
7964 pedwarn (loc
, OPT_Wmain
,
7965 "%qD is normally a non-static function", decl1
);
7968 /* Record the decl so that the function name is defined.
7969 If we already have a decl for this name, and it is a FUNCTION_DECL,
7970 use the old decl. */
7972 current_function_decl
= pushdecl (decl1
);
7975 declare_parm_level ();
7977 restype
= TREE_TYPE (TREE_TYPE (current_function_decl
));
7978 resdecl
= build_decl (loc
, RESULT_DECL
, NULL_TREE
, restype
);
7979 DECL_ARTIFICIAL (resdecl
) = 1;
7980 DECL_IGNORED_P (resdecl
) = 1;
7981 DECL_RESULT (current_function_decl
) = resdecl
;
7983 start_fname_decls ();
7988 /* Subroutine of store_parm_decls which handles new-style function
7989 definitions (prototype format). The parms already have decls, so we
7990 need only record them as in effect and complain if any redundant
7991 old-style parm decls were written. */
7993 store_parm_decls_newstyle (tree fndecl
, const struct c_arg_info
*arg_info
)
7999 if (current_scope
->bindings
)
8001 error_at (DECL_SOURCE_LOCATION (fndecl
),
8002 "old-style parameter declarations in prototyped "
8003 "function definition");
8005 /* Get rid of the old-style declarations. */
8009 /* Don't issue this warning for nested functions, and don't issue this
8010 warning if we got here because ARG_INFO_TYPES was error_mark_node
8011 (this happens when a function definition has just an ellipsis in
8012 its parameter list). */
8013 else if (!in_system_header
&& !current_function_scope
8014 && arg_info
->types
!= error_mark_node
)
8015 warning_at (DECL_SOURCE_LOCATION (fndecl
), OPT_Wtraditional
,
8016 "traditional C rejects ISO C style function definitions");
8018 /* Now make all the parameter declarations visible in the function body.
8019 We can bypass most of the grunt work of pushdecl. */
8020 for (decl
= arg_info
->parms
; decl
; decl
= DECL_CHAIN (decl
))
8022 DECL_CONTEXT (decl
) = current_function_decl
;
8023 if (DECL_NAME (decl
))
8025 bind (DECL_NAME (decl
), decl
, current_scope
,
8026 /*invisible=*/false, /*nested=*/false,
8028 if (!TREE_USED (decl
))
8029 warn_if_shadowing (decl
);
8032 error_at (DECL_SOURCE_LOCATION (decl
), "parameter name omitted");
8035 /* Record the parameter list in the function declaration. */
8036 DECL_ARGUMENTS (fndecl
) = arg_info
->parms
;
8038 /* Now make all the ancillary declarations visible, likewise. */
8039 for (decl
= arg_info
->others
; decl
; decl
= DECL_CHAIN (decl
))
8041 DECL_CONTEXT (decl
) = current_function_decl
;
8042 if (DECL_NAME (decl
))
8043 bind (DECL_NAME (decl
), decl
, current_scope
,
8044 /*invisible=*/false,
8045 /*nested=*/(TREE_CODE (decl
) == FUNCTION_DECL
),
8049 /* And all the tag declarations. */
8050 FOR_EACH_VEC_ELT_REVERSE (c_arg_tag
, arg_info
->tags
, ix
, tag
)
8052 bind (tag
->id
, tag
->type
, current_scope
,
8053 /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION
);
8056 /* Subroutine of store_parm_decls which handles old-style function
8057 definitions (separate parameter list and declarations). */
8060 store_parm_decls_oldstyle (tree fndecl
, const struct c_arg_info
*arg_info
)
8062 struct c_binding
*b
;
8063 tree parm
, decl
, last
;
8064 tree parmids
= arg_info
->parms
;
8065 struct pointer_set_t
*seen_args
= pointer_set_create ();
8067 if (!in_system_header
)
8068 warning_at (DECL_SOURCE_LOCATION (fndecl
),
8069 OPT_Wold_style_definition
, "old-style function definition");
8071 /* Match each formal parameter name with its declaration. Save each
8072 decl in the appropriate TREE_PURPOSE slot of the parmids chain. */
8073 for (parm
= parmids
; parm
; parm
= TREE_CHAIN (parm
))
8075 if (TREE_VALUE (parm
) == 0)
8077 error_at (DECL_SOURCE_LOCATION (fndecl
),
8078 "parameter name missing from parameter list");
8079 TREE_PURPOSE (parm
) = 0;
8083 b
= I_SYMBOL_BINDING (TREE_VALUE (parm
));
8084 if (b
&& B_IN_CURRENT_SCOPE (b
))
8087 /* Skip erroneous parameters. */
8088 if (decl
== error_mark_node
)
8090 /* If we got something other than a PARM_DECL it is an error. */
8091 if (TREE_CODE (decl
) != PARM_DECL
)
8092 error_at (DECL_SOURCE_LOCATION (decl
),
8093 "%qD declared as a non-parameter", decl
);
8094 /* If the declaration is already marked, we have a duplicate
8095 name. Complain and ignore the duplicate. */
8096 else if (pointer_set_contains (seen_args
, decl
))
8098 error_at (DECL_SOURCE_LOCATION (decl
),
8099 "multiple parameters named %qD", decl
);
8100 TREE_PURPOSE (parm
) = 0;
8103 /* If the declaration says "void", complain and turn it into
8105 else if (VOID_TYPE_P (TREE_TYPE (decl
)))
8107 error_at (DECL_SOURCE_LOCATION (decl
),
8108 "parameter %qD declared with void type", decl
);
8109 TREE_TYPE (decl
) = integer_type_node
;
8110 DECL_ARG_TYPE (decl
) = integer_type_node
;
8111 layout_decl (decl
, 0);
8113 warn_if_shadowing (decl
);
8115 /* If no declaration found, default to int. */
8118 /* FIXME diagnostics: This should be the location of the argument,
8119 not the FNDECL. E.g., for an old-style declaration
8121 int f10(v) { blah; }
8123 We should use the location of the V, not the F10.
8124 Unfortunately, the V is an IDENTIFIER_NODE which has no
8125 location. In the future we need locations for c_arg_info
8128 See gcc.dg/Wshadow-3.c for an example of this problem. */
8129 decl
= build_decl (DECL_SOURCE_LOCATION (fndecl
),
8130 PARM_DECL
, TREE_VALUE (parm
), integer_type_node
);
8131 DECL_ARG_TYPE (decl
) = TREE_TYPE (decl
);
8133 warn_if_shadowing (decl
);
8136 pedwarn (DECL_SOURCE_LOCATION (decl
),
8137 0, "type of %qD defaults to %<int%>", decl
);
8139 warning_at (DECL_SOURCE_LOCATION (decl
),
8140 OPT_Wmissing_parameter_type
,
8141 "type of %qD defaults to %<int%>", decl
);
8144 TREE_PURPOSE (parm
) = decl
;
8145 pointer_set_insert (seen_args
, decl
);
8148 /* Now examine the parms chain for incomplete declarations
8149 and declarations with no corresponding names. */
8151 for (b
= current_scope
->bindings
; b
; b
= b
->prev
)
8154 if (TREE_CODE (parm
) != PARM_DECL
)
8157 if (TREE_TYPE (parm
) != error_mark_node
8158 && !COMPLETE_TYPE_P (TREE_TYPE (parm
)))
8160 error_at (DECL_SOURCE_LOCATION (parm
),
8161 "parameter %qD has incomplete type", parm
);
8162 TREE_TYPE (parm
) = error_mark_node
;
8165 if (!pointer_set_contains (seen_args
, parm
))
8167 error_at (DECL_SOURCE_LOCATION (parm
),
8168 "declaration for parameter %qD but no such parameter",
8171 /* Pretend the parameter was not missing.
8172 This gets us to a standard state and minimizes
8173 further error messages. */
8174 parmids
= chainon (parmids
, tree_cons (parm
, 0, 0));
8178 /* Chain the declarations together in the order of the list of
8179 names. Store that chain in the function decl, replacing the
8180 list of names. Update the current scope to match. */
8181 DECL_ARGUMENTS (fndecl
) = 0;
8183 for (parm
= parmids
; parm
; parm
= TREE_CHAIN (parm
))
8184 if (TREE_PURPOSE (parm
))
8186 if (parm
&& TREE_PURPOSE (parm
))
8188 last
= TREE_PURPOSE (parm
);
8189 DECL_ARGUMENTS (fndecl
) = last
;
8191 for (parm
= TREE_CHAIN (parm
); parm
; parm
= TREE_CHAIN (parm
))
8192 if (TREE_PURPOSE (parm
))
8194 DECL_CHAIN (last
) = TREE_PURPOSE (parm
);
8195 last
= TREE_PURPOSE (parm
);
8197 DECL_CHAIN (last
) = 0;
8200 pointer_set_destroy (seen_args
);
8202 /* If there was a previous prototype,
8203 set the DECL_ARG_TYPE of each argument according to
8204 the type previously specified, and report any mismatches. */
8206 if (current_function_prototype_arg_types
)
8209 for (parm
= DECL_ARGUMENTS (fndecl
),
8210 type
= current_function_prototype_arg_types
;
8211 parm
|| (type
&& TREE_VALUE (type
) != error_mark_node
8212 && (TYPE_MAIN_VARIANT (TREE_VALUE (type
)) != void_type_node
));
8213 parm
= DECL_CHAIN (parm
), type
= TREE_CHAIN (type
))
8215 if (parm
== 0 || type
== 0
8216 || TYPE_MAIN_VARIANT (TREE_VALUE (type
)) == void_type_node
)
8218 if (current_function_prototype_built_in
)
8219 warning_at (DECL_SOURCE_LOCATION (fndecl
),
8220 0, "number of arguments doesn%'t match "
8221 "built-in prototype");
8224 /* FIXME diagnostics: This should be the location of
8225 FNDECL, but there is bug when a prototype is
8226 declared inside function context, but defined
8227 outside of it (e.g., gcc.dg/pr15698-2.c). In
8228 which case FNDECL gets the location of the
8229 prototype, not the definition. */
8230 error_at (input_location
,
8231 "number of arguments doesn%'t match prototype");
8233 error_at (current_function_prototype_locus
,
8234 "prototype declaration");
8238 /* Type for passing arg must be consistent with that
8239 declared for the arg. ISO C says we take the unqualified
8240 type for parameters declared with qualified type. */
8241 if (TREE_TYPE (parm
) != error_mark_node
8242 && TREE_TYPE (type
) != error_mark_node
8243 && !comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm
)),
8244 TYPE_MAIN_VARIANT (TREE_VALUE (type
))))
8246 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm
))
8247 == TYPE_MAIN_VARIANT (TREE_VALUE (type
)))
8249 /* Adjust argument to match prototype. E.g. a previous
8250 `int foo(float);' prototype causes
8251 `int foo(x) float x; {...}' to be treated like
8252 `int foo(float x) {...}'. This is particularly
8253 useful for argument types like uid_t. */
8254 DECL_ARG_TYPE (parm
) = TREE_TYPE (parm
);
8256 if (targetm
.calls
.promote_prototypes (TREE_TYPE (current_function_decl
))
8257 && INTEGRAL_TYPE_P (TREE_TYPE (parm
))
8258 && TYPE_PRECISION (TREE_TYPE (parm
))
8259 < TYPE_PRECISION (integer_type_node
))
8260 DECL_ARG_TYPE (parm
) = integer_type_node
;
8262 /* ??? Is it possible to get here with a
8263 built-in prototype or will it always have
8264 been diagnosed as conflicting with an
8265 old-style definition and discarded? */
8266 if (current_function_prototype_built_in
)
8267 warning_at (DECL_SOURCE_LOCATION (parm
),
8268 OPT_pedantic
, "promoted argument %qD "
8269 "doesn%'t match built-in prototype", parm
);
8272 pedwarn (DECL_SOURCE_LOCATION (parm
),
8273 OPT_pedantic
, "promoted argument %qD "
8274 "doesn%'t match prototype", parm
);
8275 pedwarn (current_function_prototype_locus
, OPT_pedantic
,
8276 "prototype declaration");
8281 if (current_function_prototype_built_in
)
8282 warning_at (DECL_SOURCE_LOCATION (parm
),
8283 0, "argument %qD doesn%'t match "
8284 "built-in prototype", parm
);
8287 error_at (DECL_SOURCE_LOCATION (parm
),
8288 "argument %qD doesn%'t match prototype", parm
);
8289 error_at (current_function_prototype_locus
,
8290 "prototype declaration");
8295 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl
)) = 0;
8298 /* Otherwise, create a prototype that would match. */
8302 tree actual
= 0, last
= 0, type
;
8304 for (parm
= DECL_ARGUMENTS (fndecl
); parm
; parm
= DECL_CHAIN (parm
))
8306 type
= tree_cons (NULL_TREE
, DECL_ARG_TYPE (parm
), NULL_TREE
);
8308 TREE_CHAIN (last
) = type
;
8313 type
= tree_cons (NULL_TREE
, void_type_node
, NULL_TREE
);
8315 TREE_CHAIN (last
) = type
;
8319 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
8320 of the type of this function, but we need to avoid having this
8321 affect the types of other similarly-typed functions, so we must
8322 first force the generation of an identical (but separate) type
8323 node for the relevant function type. The new node we create
8324 will be a variant of the main variant of the original function
8327 TREE_TYPE (fndecl
) = build_variant_type_copy (TREE_TYPE (fndecl
));
8329 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl
)) = actual
;
8333 /* Store parameter declarations passed in ARG_INFO into the current
8334 function declaration. */
8337 store_parm_decls_from (struct c_arg_info
*arg_info
)
8339 current_function_arg_info
= arg_info
;
8340 store_parm_decls ();
8343 /* Store the parameter declarations into the current function declaration.
8344 This is called after parsing the parameter declarations, before
8345 digesting the body of the function.
8347 For an old-style definition, construct a prototype out of the old-style
8348 parameter declarations and inject it into the function's type. */
8351 store_parm_decls (void)
8353 tree fndecl
= current_function_decl
;
8356 /* The argument information block for FNDECL. */
8357 struct c_arg_info
*arg_info
= current_function_arg_info
;
8358 current_function_arg_info
= 0;
8360 /* True if this definition is written with a prototype. Note:
8361 despite C99 6.7.5.3p14, we can *not* treat an empty argument
8362 list in a function definition as equivalent to (void) -- an
8363 empty argument list specifies the function has no parameters,
8364 but only (void) sets up a prototype for future calls. */
8365 proto
= arg_info
->types
!= 0;
8368 store_parm_decls_newstyle (fndecl
, arg_info
);
8370 store_parm_decls_oldstyle (fndecl
, arg_info
);
8372 /* The next call to push_scope will be a function body. */
8374 next_is_function_body
= true;
8376 /* Write a record describing this function definition to the prototypes
8377 file (if requested). */
8379 gen_aux_info_record (fndecl
, 1, 0, proto
);
8381 /* Initialize the RTL code for the function. */
8382 allocate_struct_function (fndecl
, false);
8384 if (warn_unused_local_typedefs
)
8385 cfun
->language
= ggc_alloc_cleared_language_function ();
8387 /* Begin the statement tree for this function. */
8388 DECL_SAVED_TREE (fndecl
) = push_stmt_list ();
8390 /* ??? Insert the contents of the pending sizes list into the function
8391 to be evaluated. The only reason left to have this is
8392 void foo(int n, int array[n++])
8393 because we throw away the array type in favor of a pointer type, and
8394 thus won't naturally see the SAVE_EXPR containing the increment. All
8395 other pending sizes would be handled by gimplify_parameters. */
8396 if (arg_info
->pending_sizes
)
8397 add_stmt (arg_info
->pending_sizes
);
8401 /* Finish up a function declaration and compile that function
8402 all the way to assembler language output. Then free the storage
8403 for the function definition.
8405 This is called after parsing the body of the function definition. */
8408 finish_function (void)
8410 tree fndecl
= current_function_decl
;
8412 if (c_dialect_objc ())
8413 objc_finish_function ();
8415 if (TREE_CODE (fndecl
) == FUNCTION_DECL
8416 && targetm
.calls
.promote_prototypes (TREE_TYPE (fndecl
)))
8418 tree args
= DECL_ARGUMENTS (fndecl
);
8419 for (; args
; args
= DECL_CHAIN (args
))
8421 tree type
= TREE_TYPE (args
);
8422 if (INTEGRAL_TYPE_P (type
)
8423 && TYPE_PRECISION (type
) < TYPE_PRECISION (integer_type_node
))
8424 DECL_ARG_TYPE (args
) = integer_type_node
;
8428 if (DECL_INITIAL (fndecl
) && DECL_INITIAL (fndecl
) != error_mark_node
)
8429 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl
)) = fndecl
;
8431 /* Must mark the RESULT_DECL as being in this function. */
8433 if (DECL_RESULT (fndecl
) && DECL_RESULT (fndecl
) != error_mark_node
)
8434 DECL_CONTEXT (DECL_RESULT (fndecl
)) = fndecl
;
8436 if (MAIN_NAME_P (DECL_NAME (fndecl
)) && flag_hosted
8437 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl
)))
8438 == integer_type_node
&& flag_isoc99
)
8440 /* Hack. We don't want the middle-end to warn that this return
8441 is unreachable, so we mark its location as special. Using
8442 UNKNOWN_LOCATION has the problem that it gets clobbered in
8443 annotate_one_with_locus. A cleaner solution might be to
8444 ensure ! should_carry_locus_p (stmt), but that needs a flag.
8446 c_finish_return (BUILTINS_LOCATION
, integer_zero_node
, NULL_TREE
);
8449 /* Tie off the statement tree for this function. */
8450 DECL_SAVED_TREE (fndecl
) = pop_stmt_list (DECL_SAVED_TREE (fndecl
));
8452 finish_fname_decls ();
8454 /* Complain if there's just no return statement. */
8455 if (warn_return_type
8456 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl
))) != VOID_TYPE
8457 && !current_function_returns_value
&& !current_function_returns_null
8458 /* Don't complain if we are no-return. */
8459 && !current_function_returns_abnormally
8460 /* Don't complain if we are declared noreturn. */
8461 && !TREE_THIS_VOLATILE (fndecl
)
8462 /* Don't warn for main(). */
8463 && !MAIN_NAME_P (DECL_NAME (fndecl
))
8464 /* Or if they didn't actually specify a return type. */
8465 && !C_FUNCTION_IMPLICIT_INT (fndecl
)
8466 /* Normally, with -Wreturn-type, flow will complain, but we might
8467 optimize out static functions. */
8468 && !TREE_PUBLIC (fndecl
))
8470 warning (OPT_Wreturn_type
,
8471 "no return statement in function returning non-void");
8472 TREE_NO_WARNING (fndecl
) = 1;
8475 /* Complain about parameters that are only set, but never otherwise used. */
8476 if (warn_unused_but_set_parameter
)
8480 for (decl
= DECL_ARGUMENTS (fndecl
);
8482 decl
= DECL_CHAIN (decl
))
8483 if (TREE_USED (decl
)
8484 && TREE_CODE (decl
) == PARM_DECL
8485 && !DECL_READ_P (decl
)
8487 && !DECL_ARTIFICIAL (decl
)
8488 && !TREE_NO_WARNING (decl
))
8489 warning_at (DECL_SOURCE_LOCATION (decl
),
8490 OPT_Wunused_but_set_parameter
,
8491 "parameter %qD set but not used", decl
);
8494 /* Complain about locally defined typedefs that are not used in this
8496 maybe_warn_unused_local_typedefs ();
8498 /* Store the end of the function, so that we get good line number
8499 info for the epilogue. */
8500 cfun
->function_end_locus
= input_location
;
8502 /* Finalize the ELF visibility for the function. */
8503 c_determine_visibility (fndecl
);
8505 /* For GNU C extern inline functions disregard inline limits. */
8506 if (DECL_EXTERNAL (fndecl
)
8507 && DECL_DECLARED_INLINE_P (fndecl
))
8508 DECL_DISREGARD_INLINE_LIMITS (fndecl
) = 1;
8510 /* Genericize before inlining. Delay genericizing nested functions
8511 until their parent function is genericized. Since finalizing
8512 requires GENERIC, delay that as well. */
8514 if (DECL_INITIAL (fndecl
) && DECL_INITIAL (fndecl
) != error_mark_node
8515 && !undef_nested_function
)
8517 if (!decl_function_context (fndecl
))
8519 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE
, fndecl
);
8520 /* Lower to GENERIC form before finalization. */
8521 lang_hooks
.genericize (fndecl
);
8523 /* ??? Objc emits functions after finalizing the compilation unit.
8524 This should be cleaned up later and this conditional removed. */
8525 if (cgraph_global_info_ready
)
8527 cgraph_add_new_function (fndecl
, false);
8530 cgraph_finalize_function (fndecl
, false);
8534 /* Register this function with cgraph just far enough to get it
8535 added to our parent's nested function list. Handy, since the
8536 C front end doesn't have such a list. */
8537 (void) cgraph_get_create_node (fndecl
);
8541 if (!decl_function_context (fndecl
))
8542 undef_nested_function
= false;
8544 if (cfun
->language
!= NULL
)
8546 ggc_free (cfun
->language
);
8547 cfun
->language
= NULL
;
8550 /* We're leaving the context of this function, so zap cfun.
8551 It's still in DECL_STRUCT_FUNCTION, and we'll restore it in
8552 tree_rest_of_compilation. */
8554 current_function_decl
= NULL
;
8557 /* Check the declarations given in a for-loop for satisfying the C99
8558 constraints. If exactly one such decl is found, return it. LOC is
8559 the location of the opening parenthesis of the for loop. The last
8560 parameter allows you to control the "for loop initial declarations
8561 are only allowed in C99 mode". Normally, you should pass
8562 flag_isoc99 as that parameter. But in some cases (Objective-C
8563 foreach loop, for example) we want to run the checks in this
8564 function even if not in C99 mode, so we allow the caller to turn
8565 off the error about not being in C99 mode.
8569 check_for_loop_decls (location_t loc
, bool turn_off_iso_c99_error
)
8571 struct c_binding
*b
;
8572 tree one_decl
= NULL_TREE
;
8575 if (!turn_off_iso_c99_error
)
8577 static bool hint
= true;
8578 /* If we get here, declarations have been used in a for loop without
8579 the C99 for loop scope. This doesn't make much sense, so don't
8581 error_at (loc
, "%<for%> loop initial declarations "
8582 "are only allowed in C99 mode");
8586 "use option -std=c99 or -std=gnu99 to compile your code");
8591 /* C99 subclause 6.8.5 paragraph 3:
8593 [#3] The declaration part of a for statement shall only
8594 declare identifiers for objects having storage class auto or
8597 It isn't clear whether, in this sentence, "identifiers" binds to
8598 "shall only declare" or to "objects" - that is, whether all identifiers
8599 declared must be identifiers for objects, or whether the restriction
8600 only applies to those that are. (A question on this in comp.std.c
8601 in November 2000 received no answer.) We implement the strictest
8602 interpretation, to avoid creating an extension which later causes
8605 for (b
= current_scope
->bindings
; b
; b
= b
->prev
)
8608 tree decl
= b
->decl
;
8613 switch (TREE_CODE (decl
))
8617 location_t decl_loc
= DECL_SOURCE_LOCATION (decl
);
8618 if (TREE_STATIC (decl
))
8620 "declaration of static variable %qD in %<for%> loop "
8621 "initial declaration", decl
);
8622 else if (DECL_EXTERNAL (decl
))
8624 "declaration of %<extern%> variable %qD in %<for%> loop "
8625 "initial declaration", decl
);
8631 "%<struct %E%> declared in %<for%> loop initial "
8636 "%<union %E%> declared in %<for%> loop initial declaration",
8640 error_at (loc
, "%<enum %E%> declared in %<for%> loop "
8641 "initial declaration", id
);
8644 error_at (loc
, "declaration of non-variable "
8645 "%qD in %<for%> loop initial declaration", decl
);
8652 return n_decls
== 1 ? one_decl
: NULL_TREE
;
8655 /* Save and reinitialize the variables
8656 used during compilation of a C function. */
8659 c_push_function_context (void)
8661 struct language_function
*p
= cfun
->language
;
8662 /* cfun->language might have been already allocated by the use of
8663 -Wunused-local-typedefs. In that case, just re-use it. */
8665 cfun
->language
= p
= ggc_alloc_cleared_language_function ();
8667 p
->base
.x_stmt_tree
= c_stmt_tree
;
8668 c_stmt_tree
.x_cur_stmt_list
8669 = VEC_copy (tree
, gc
, c_stmt_tree
.x_cur_stmt_list
);
8670 p
->x_break_label
= c_break_label
;
8671 p
->x_cont_label
= c_cont_label
;
8672 p
->x_switch_stack
= c_switch_stack
;
8673 p
->arg_info
= current_function_arg_info
;
8674 p
->returns_value
= current_function_returns_value
;
8675 p
->returns_null
= current_function_returns_null
;
8676 p
->returns_abnormally
= current_function_returns_abnormally
;
8677 p
->warn_about_return_type
= warn_about_return_type
;
8679 push_function_context ();
8682 /* Restore the variables used during compilation of a C function. */
8685 c_pop_function_context (void)
8687 struct language_function
*p
;
8689 pop_function_context ();
8691 /* When -Wunused-local-typedefs is in effect, cfun->languages is
8692 used to store data throughout the life time of the current cfun,
8693 So don't deallocate it. */
8694 if (!warn_unused_local_typedefs
)
8695 cfun
->language
= NULL
;
8697 if (DECL_STRUCT_FUNCTION (current_function_decl
) == 0
8698 && DECL_SAVED_TREE (current_function_decl
) == NULL_TREE
)
8700 /* Stop pointing to the local nodes about to be freed. */
8701 /* But DECL_INITIAL must remain nonzero so we know this
8702 was an actual function definition. */
8703 DECL_INITIAL (current_function_decl
) = error_mark_node
;
8704 DECL_ARGUMENTS (current_function_decl
) = 0;
8707 c_stmt_tree
= p
->base
.x_stmt_tree
;
8708 c_break_label
= p
->x_break_label
;
8709 c_cont_label
= p
->x_cont_label
;
8710 c_switch_stack
= p
->x_switch_stack
;
8711 current_function_arg_info
= p
->arg_info
;
8712 current_function_returns_value
= p
->returns_value
;
8713 current_function_returns_null
= p
->returns_null
;
8714 current_function_returns_abnormally
= p
->returns_abnormally
;
8715 warn_about_return_type
= p
->warn_about_return_type
;
8718 /* The functions below are required for functionality of doing
8719 function at once processing in the C front end. Currently these
8720 functions are not called from anywhere in the C front end, but as
8721 these changes continue, that will change. */
8723 /* Returns the stmt_tree (if any) to which statements are currently
8724 being added. If there is no active statement-tree, NULL is
8728 current_stmt_tree (void)
8730 return &c_stmt_tree
;
8733 /* Return the global value of T as a symbol. */
8736 identifier_global_value (tree t
)
8738 struct c_binding
*b
;
8740 for (b
= I_SYMBOL_BINDING (t
); b
; b
= b
->shadowed
)
8741 if (B_IN_FILE_SCOPE (b
) || B_IN_EXTERNAL_SCOPE (b
))
8747 /* In C, the only C-linkage public declaration is at file scope. */
8750 c_linkage_bindings (tree name
)
8752 return identifier_global_value (name
);
8755 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
8756 otherwise the name is found in ridpointers from RID_INDEX. */
8759 record_builtin_type (enum rid rid_index
, const char *name
, tree type
)
8763 id
= ridpointers
[(int) rid_index
];
8765 id
= get_identifier (name
);
8766 decl
= build_decl (UNKNOWN_LOCATION
, TYPE_DECL
, id
, type
);
8768 if (debug_hooks
->type_decl
)
8769 debug_hooks
->type_decl (decl
, false);
8772 /* Build the void_list_node (void_type_node having been created). */
8774 build_void_list_node (void)
8776 tree t
= build_tree_list (NULL_TREE
, void_type_node
);
8780 /* Return a c_parm structure with the given SPECS, ATTRS and DECLARATOR. */
8783 build_c_parm (struct c_declspecs
*specs
, tree attrs
,
8784 struct c_declarator
*declarator
)
8786 struct c_parm
*ret
= XOBNEW (&parser_obstack
, struct c_parm
);
8789 ret
->declarator
= declarator
;
8793 /* Return a declarator with nested attributes. TARGET is the inner
8794 declarator to which these attributes apply. ATTRS are the
8797 struct c_declarator
*
8798 build_attrs_declarator (tree attrs
, struct c_declarator
*target
)
8800 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
8801 ret
->kind
= cdk_attrs
;
8802 ret
->declarator
= target
;
8803 ret
->u
.attrs
= attrs
;
8807 /* Return a declarator for a function with arguments specified by ARGS
8808 and return type specified by TARGET. */
8810 struct c_declarator
*
8811 build_function_declarator (struct c_arg_info
*args
,
8812 struct c_declarator
*target
)
8814 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
8815 ret
->kind
= cdk_function
;
8816 ret
->declarator
= target
;
8817 ret
->u
.arg_info
= args
;
8821 /* Return a declarator for the identifier IDENT (which may be
8822 NULL_TREE for an abstract declarator). */
8824 struct c_declarator
*
8825 build_id_declarator (tree ident
)
8827 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
8829 ret
->declarator
= 0;
8831 /* Default value - may get reset to a more precise location. */
8832 ret
->id_loc
= input_location
;
8836 /* Return something to represent absolute declarators containing a *.
8837 TARGET is the absolute declarator that the * contains.
8838 TYPE_QUALS_ATTRS is a structure for type qualifiers and attributes
8839 to apply to the pointer type. */
8841 struct c_declarator
*
8842 make_pointer_declarator (struct c_declspecs
*type_quals_attrs
,
8843 struct c_declarator
*target
)
8847 tree upc_layout_qual
= 0;
8848 struct c_declarator
*itarget
= target
;
8849 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
8850 if (type_quals_attrs
)
8852 attrs
= type_quals_attrs
->attrs
;
8853 quals
= quals_from_declspecs (type_quals_attrs
);
8854 upc_layout_qual
= type_quals_attrs
->upc_layout_qualifier
;
8855 if (attrs
!= NULL_TREE
)
8856 itarget
= build_attrs_declarator (attrs
, target
);
8858 ret
->kind
= cdk_pointer
;
8859 ret
->declarator
= itarget
;
8860 ret
->u
.pointer
.quals
= quals
;
8861 ret
->u
.pointer
.upc_layout_qual
= upc_layout_qual
;
8865 /* Return a pointer to a structure for an empty list of declaration
8868 struct c_declspecs
*
8869 build_null_declspecs (void)
8871 struct c_declspecs
*ret
= XOBNEW (&parser_obstack
, struct c_declspecs
);
8876 ret
->upc_layout_qualifier
= 0;
8877 ret
->typespec_word
= cts_none
;
8878 ret
->storage_class
= csc_none
;
8879 ret
->expr_const_operands
= true;
8880 ret
->declspecs_seen_p
= false;
8881 ret
->typespec_kind
= ctsk_none
;
8882 ret
->non_sc_seen_p
= false;
8883 ret
->typedef_p
= false;
8884 ret
->explicit_signed_p
= false;
8885 ret
->deprecated_p
= false;
8886 ret
->default_int_p
= false;
8887 ret
->long_p
= false;
8888 ret
->long_long_p
= false;
8889 ret
->short_p
= false;
8890 ret
->signed_p
= false;
8891 ret
->unsigned_p
= false;
8892 ret
->complex_p
= false;
8893 ret
->inline_p
= false;
8894 ret
->noreturn_p
= false;
8895 ret
->thread_p
= false;
8896 ret
->const_p
= false;
8897 ret
->volatile_p
= false;
8898 ret
->restrict_p
= false;
8899 ret
->shared_p
= false;
8900 ret
->strict_p
= false;
8901 ret
->relaxed_p
= false;
8902 ret
->saturating_p
= false;
8903 ret
->address_space
= ADDR_SPACE_GENERIC
;
8907 /* Add the address space ADDRSPACE to the declaration specifiers
8908 SPECS, returning SPECS. */
8910 struct c_declspecs
*
8911 declspecs_add_addrspace (struct c_declspecs
*specs
, addr_space_t as
)
8913 specs
->non_sc_seen_p
= true;
8914 specs
->declspecs_seen_p
= true;
8916 if (!ADDR_SPACE_GENERIC_P (specs
->address_space
)
8917 && specs
->address_space
!= as
)
8918 error ("incompatible address space qualifiers %qs and %qs",
8919 c_addr_space_name (as
),
8920 c_addr_space_name (specs
->address_space
));
8922 specs
->address_space
= as
;
8926 /* Add the type qualifier QUAL to the declaration specifiers SPECS,
8929 struct c_declspecs
*
8930 declspecs_add_qual (struct c_declspecs
*specs
, tree qual
)
8934 specs
->non_sc_seen_p
= true;
8935 specs
->declspecs_seen_p
= true;
8937 /* A UPC layout qualifier is encoded as an ARRAY_REF,
8938 further, it implies the presence of the 'shared' keyword. */
8939 if (TREE_CODE (qual
) == ARRAY_REF
)
8941 if (specs
->upc_layout_qualifier
)
8943 error ("two or more layout qualifiers specified");
8948 specs
->upc_layout_qualifier
= qual
;
8949 qual
= ridpointers
[RID_SHARED
];
8953 gcc_assert (TREE_CODE (qual
) == IDENTIFIER_NODE
8954 && C_IS_RESERVED_WORD (qual
));
8955 i
= C_RID_CODE (qual
);
8959 dupe
= specs
->const_p
;
8960 specs
->const_p
= true;
8963 dupe
= specs
->volatile_p
;
8964 specs
->volatile_p
= true;
8967 dupe
= specs
->restrict_p
;
8968 specs
->restrict_p
= true;
8971 dupe
= specs
->shared_p
;
8972 specs
->shared_p
= true;
8975 dupe
= specs
->strict_p
;
8976 specs
->strict_p
= true;
8979 dupe
= specs
->relaxed_p
;
8980 specs
->relaxed_p
= true;
8985 if (dupe
&& !flag_isoc99
)
8986 pedwarn (input_location
, OPT_pedantic
, "duplicate %qE", qual
);
8990 /* Add the type specifier TYPE to the declaration specifiers SPECS,
8993 struct c_declspecs
*
8994 declspecs_add_type (location_t loc
, struct c_declspecs
*specs
,
8995 struct c_typespec spec
)
8997 tree type
= spec
.spec
;
8998 specs
->non_sc_seen_p
= true;
8999 specs
->declspecs_seen_p
= true;
9000 specs
->typespec_kind
= spec
.kind
;
9001 if (TREE_DEPRECATED (type
))
9002 specs
->deprecated_p
= true;
9004 /* Handle type specifier keywords. */
9005 if (TREE_CODE (type
) == IDENTIFIER_NODE
9006 && C_IS_RESERVED_WORD (type
)
9007 && C_RID_CODE (type
) != RID_CXX_COMPAT_WARN
)
9009 enum rid i
= C_RID_CODE (type
);
9012 error_at (loc
, "two or more data types in declaration specifiers");
9015 if ((int) i
<= (int) RID_LAST_MODIFIER
)
9017 /* "long", "short", "signed", "unsigned", "_Complex" or "_Sat". */
9022 if (specs
->long_long_p
)
9024 error_at (loc
, "%<long long long%> is too long for GCC");
9029 if (specs
->typespec_word
== cts_double
)
9032 ("both %<long long%> and %<double%> in "
9033 "declaration specifiers"));
9036 pedwarn_c90 (loc
, OPT_Wlong_long
,
9037 "ISO C90 does not support %<long long%>");
9038 specs
->long_long_p
= 1;
9043 ("both %<long%> and %<short%> in "
9044 "declaration specifiers"));
9045 else if (specs
->typespec_word
== cts_void
)
9047 ("both %<long%> and %<void%> in "
9048 "declaration specifiers"));
9049 else if (specs
->typespec_word
== cts_int128
)
9051 ("both %<long%> and %<__int128%> in "
9052 "declaration specifiers"));
9053 else if (specs
->typespec_word
== cts_bool
)
9055 ("both %<long%> and %<_Bool%> in "
9056 "declaration specifiers"));
9057 else if (specs
->typespec_word
== cts_char
)
9059 ("both %<long%> and %<char%> in "
9060 "declaration specifiers"));
9061 else if (specs
->typespec_word
== cts_float
)
9063 ("both %<long%> and %<float%> in "
9064 "declaration specifiers"));
9065 else if (specs
->typespec_word
== cts_dfloat32
)
9067 ("both %<long%> and %<_Decimal32%> in "
9068 "declaration specifiers"));
9069 else if (specs
->typespec_word
== cts_dfloat64
)
9071 ("both %<long%> and %<_Decimal64%> in "
9072 "declaration specifiers"));
9073 else if (specs
->typespec_word
== cts_dfloat128
)
9075 ("both %<long%> and %<_Decimal128%> in "
9076 "declaration specifiers"));
9078 specs
->long_p
= true;
9081 dupe
= specs
->short_p
;
9084 ("both %<long%> and %<short%> in "
9085 "declaration specifiers"));
9086 else if (specs
->typespec_word
== cts_void
)
9088 ("both %<short%> and %<void%> in "
9089 "declaration specifiers"));
9090 else if (specs
->typespec_word
== cts_int128
)
9092 ("both %<short%> and %<__int128%> in "
9093 "declaration specifiers"));
9094 else if (specs
->typespec_word
== cts_bool
)
9096 ("both %<short%> and %<_Bool%> in "
9097 "declaration specifiers"));
9098 else if (specs
->typespec_word
== cts_char
)
9100 ("both %<short%> and %<char%> in "
9101 "declaration specifiers"));
9102 else if (specs
->typespec_word
== cts_float
)
9104 ("both %<short%> and %<float%> in "
9105 "declaration specifiers"));
9106 else if (specs
->typespec_word
== cts_double
)
9108 ("both %<short%> and %<double%> in "
9109 "declaration specifiers"));
9110 else if (specs
->typespec_word
== cts_dfloat32
)
9112 ("both %<short%> and %<_Decimal32%> in "
9113 "declaration specifiers"));
9114 else if (specs
->typespec_word
== cts_dfloat64
)
9116 ("both %<short%> and %<_Decimal64%> in "
9117 "declaration specifiers"));
9118 else if (specs
->typespec_word
== cts_dfloat128
)
9120 ("both %<short%> and %<_Decimal128%> in "
9121 "declaration specifiers"));
9123 specs
->short_p
= true;
9126 dupe
= specs
->signed_p
;
9127 if (specs
->unsigned_p
)
9129 ("both %<signed%> and %<unsigned%> in "
9130 "declaration specifiers"));
9131 else if (specs
->typespec_word
== cts_void
)
9133 ("both %<signed%> and %<void%> in "
9134 "declaration specifiers"));
9135 else if (specs
->typespec_word
== cts_bool
)
9137 ("both %<signed%> and %<_Bool%> in "
9138 "declaration specifiers"));
9139 else if (specs
->typespec_word
== cts_float
)
9141 ("both %<signed%> and %<float%> in "
9142 "declaration specifiers"));
9143 else if (specs
->typespec_word
== cts_double
)
9145 ("both %<signed%> and %<double%> in "
9146 "declaration specifiers"));
9147 else if (specs
->typespec_word
== cts_dfloat32
)
9149 ("both %<signed%> and %<_Decimal32%> in "
9150 "declaration specifiers"));
9151 else if (specs
->typespec_word
== cts_dfloat64
)
9153 ("both %<signed%> and %<_Decimal64%> in "
9154 "declaration specifiers"));
9155 else if (specs
->typespec_word
== cts_dfloat128
)
9157 ("both %<signed%> and %<_Decimal128%> in "
9158 "declaration specifiers"));
9160 specs
->signed_p
= true;
9163 dupe
= specs
->unsigned_p
;
9164 if (specs
->signed_p
)
9166 ("both %<signed%> and %<unsigned%> in "
9167 "declaration specifiers"));
9168 else if (specs
->typespec_word
== cts_void
)
9170 ("both %<unsigned%> and %<void%> in "
9171 "declaration specifiers"));
9172 else if (specs
->typespec_word
== cts_bool
)
9174 ("both %<unsigned%> and %<_Bool%> in "
9175 "declaration specifiers"));
9176 else if (specs
->typespec_word
== cts_float
)
9178 ("both %<unsigned%> and %<float%> in "
9179 "declaration specifiers"));
9180 else if (specs
->typespec_word
== cts_double
)
9182 ("both %<unsigned%> and %<double%> in "
9183 "declaration specifiers"));
9184 else if (specs
->typespec_word
== cts_dfloat32
)
9186 ("both %<unsigned%> and %<_Decimal32%> in "
9187 "declaration specifiers"));
9188 else if (specs
->typespec_word
== cts_dfloat64
)
9190 ("both %<unsigned%> and %<_Decimal64%> in "
9191 "declaration specifiers"));
9192 else if (specs
->typespec_word
== cts_dfloat128
)
9194 ("both %<unsigned%> and %<_Decimal128%> in "
9195 "declaration specifiers"));
9197 specs
->unsigned_p
= true;
9200 dupe
= specs
->complex_p
;
9201 if (!flag_isoc99
&& !in_system_header
)
9202 pedwarn (loc
, OPT_pedantic
,
9203 "ISO C90 does not support complex types");
9204 if (specs
->typespec_word
== cts_void
)
9206 ("both %<complex%> and %<void%> in "
9207 "declaration specifiers"));
9208 else if (specs
->typespec_word
== cts_bool
)
9210 ("both %<complex%> and %<_Bool%> in "
9211 "declaration specifiers"));
9212 else if (specs
->typespec_word
== cts_dfloat32
)
9214 ("both %<complex%> and %<_Decimal32%> in "
9215 "declaration specifiers"));
9216 else if (specs
->typespec_word
== cts_dfloat64
)
9218 ("both %<complex%> and %<_Decimal64%> in "
9219 "declaration specifiers"));
9220 else if (specs
->typespec_word
== cts_dfloat128
)
9222 ("both %<complex%> and %<_Decimal128%> in "
9223 "declaration specifiers"));
9224 else if (specs
->typespec_word
== cts_fract
)
9226 ("both %<complex%> and %<_Fract%> in "
9227 "declaration specifiers"));
9228 else if (specs
->typespec_word
== cts_accum
)
9230 ("both %<complex%> and %<_Accum%> in "
9231 "declaration specifiers"));
9232 else if (specs
->saturating_p
)
9234 ("both %<complex%> and %<_Sat%> in "
9235 "declaration specifiers"));
9237 specs
->complex_p
= true;
9240 dupe
= specs
->saturating_p
;
9241 pedwarn (loc
, OPT_pedantic
,
9242 "ISO C does not support saturating types");
9243 if (specs
->typespec_word
== cts_int128
)
9246 ("both %<_Sat%> and %<__int128%> in "
9247 "declaration specifiers"));
9249 else if (specs
->typespec_word
== cts_void
)
9251 ("both %<_Sat%> and %<void%> in "
9252 "declaration specifiers"));
9253 else if (specs
->typespec_word
== cts_bool
)
9255 ("both %<_Sat%> and %<_Bool%> in "
9256 "declaration specifiers"));
9257 else if (specs
->typespec_word
== cts_char
)
9259 ("both %<_Sat%> and %<char%> in "
9260 "declaration specifiers"));
9261 else if (specs
->typespec_word
== cts_int
)
9263 ("both %<_Sat%> and %<int%> in "
9264 "declaration specifiers"));
9265 else if (specs
->typespec_word
== cts_float
)
9267 ("both %<_Sat%> and %<float%> in "
9268 "declaration specifiers"));
9269 else if (specs
->typespec_word
== cts_double
)
9271 ("both %<_Sat%> and %<double%> in "
9272 "declaration specifiers"));
9273 else if (specs
->typespec_word
== cts_dfloat32
)
9275 ("both %<_Sat%> and %<_Decimal32%> in "
9276 "declaration specifiers"));
9277 else if (specs
->typespec_word
== cts_dfloat64
)
9279 ("both %<_Sat%> and %<_Decimal64%> in "
9280 "declaration specifiers"));
9281 else if (specs
->typespec_word
== cts_dfloat128
)
9283 ("both %<_Sat%> and %<_Decimal128%> in "
9284 "declaration specifiers"));
9285 else if (specs
->complex_p
)
9287 ("both %<_Sat%> and %<complex%> in "
9288 "declaration specifiers"));
9290 specs
->saturating_p
= true;
9297 error_at (loc
, "duplicate %qE", type
);
9303 /* "void", "_Bool", "char", "int", "float", "double", "_Decimal32",
9304 "__int128", "_Decimal64", "_Decimal128", "_Fract" or "_Accum". */
9305 if (specs
->typespec_word
!= cts_none
)
9308 "two or more data types in declaration specifiers");
9314 if (int128_integer_type_node
== NULL_TREE
)
9316 error_at (loc
, "%<__int128%> is not supported for this target");
9319 if (!in_system_header
)
9320 pedwarn (loc
, OPT_pedantic
,
9321 "ISO C does not support %<__int128%> type");
9325 ("both %<__int128%> and %<long%> in "
9326 "declaration specifiers"));
9327 else if (specs
->saturating_p
)
9329 ("both %<_Sat%> and %<__int128%> in "
9330 "declaration specifiers"));
9331 else if (specs
->short_p
)
9333 ("both %<__int128%> and %<short%> in "
9334 "declaration specifiers"));
9336 specs
->typespec_word
= cts_int128
;
9341 ("both %<long%> and %<void%> in "
9342 "declaration specifiers"));
9343 else if (specs
->short_p
)
9345 ("both %<short%> and %<void%> in "
9346 "declaration specifiers"));
9347 else if (specs
->signed_p
)
9349 ("both %<signed%> and %<void%> in "
9350 "declaration specifiers"));
9351 else if (specs
->unsigned_p
)
9353 ("both %<unsigned%> and %<void%> in "
9354 "declaration specifiers"));
9355 else if (specs
->complex_p
)
9357 ("both %<complex%> and %<void%> in "
9358 "declaration specifiers"));
9359 else if (specs
->saturating_p
)
9361 ("both %<_Sat%> and %<void%> in "
9362 "declaration specifiers"));
9364 specs
->typespec_word
= cts_void
;
9369 ("both %<long%> and %<_Bool%> in "
9370 "declaration specifiers"));
9371 else if (specs
->short_p
)
9373 ("both %<short%> and %<_Bool%> in "
9374 "declaration specifiers"));
9375 else if (specs
->signed_p
)
9377 ("both %<signed%> and %<_Bool%> in "
9378 "declaration specifiers"));
9379 else if (specs
->unsigned_p
)
9381 ("both %<unsigned%> and %<_Bool%> in "
9382 "declaration specifiers"));
9383 else if (specs
->complex_p
)
9385 ("both %<complex%> and %<_Bool%> in "
9386 "declaration specifiers"));
9387 else if (specs
->saturating_p
)
9389 ("both %<_Sat%> and %<_Bool%> in "
9390 "declaration specifiers"));
9392 specs
->typespec_word
= cts_bool
;
9397 ("both %<long%> and %<char%> in "
9398 "declaration specifiers"));
9399 else if (specs
->short_p
)
9401 ("both %<short%> and %<char%> in "
9402 "declaration specifiers"));
9403 else if (specs
->saturating_p
)
9405 ("both %<_Sat%> and %<char%> in "
9406 "declaration specifiers"));
9408 specs
->typespec_word
= cts_char
;
9411 if (specs
->saturating_p
)
9413 ("both %<_Sat%> and %<int%> in "
9414 "declaration specifiers"));
9416 specs
->typespec_word
= cts_int
;
9421 ("both %<long%> and %<float%> in "
9422 "declaration specifiers"));
9423 else if (specs
->short_p
)
9425 ("both %<short%> and %<float%> in "
9426 "declaration specifiers"));
9427 else if (specs
->signed_p
)
9429 ("both %<signed%> and %<float%> in "
9430 "declaration specifiers"));
9431 else if (specs
->unsigned_p
)
9433 ("both %<unsigned%> and %<float%> in "
9434 "declaration specifiers"));
9435 else if (specs
->saturating_p
)
9437 ("both %<_Sat%> and %<float%> in "
9438 "declaration specifiers"));
9440 specs
->typespec_word
= cts_float
;
9443 if (specs
->long_long_p
)
9445 ("both %<long long%> and %<double%> in "
9446 "declaration specifiers"));
9447 else if (specs
->short_p
)
9449 ("both %<short%> and %<double%> in "
9450 "declaration specifiers"));
9451 else if (specs
->signed_p
)
9453 ("both %<signed%> and %<double%> in "
9454 "declaration specifiers"));
9455 else if (specs
->unsigned_p
)
9457 ("both %<unsigned%> and %<double%> in "
9458 "declaration specifiers"));
9459 else if (specs
->saturating_p
)
9461 ("both %<_Sat%> and %<double%> in "
9462 "declaration specifiers"));
9464 specs
->typespec_word
= cts_double
;
9471 if (i
== RID_DFLOAT32
)
9473 else if (i
== RID_DFLOAT64
)
9476 str
= "_Decimal128";
9477 if (specs
->long_long_p
)
9479 ("both %<long long%> and %<%s%> in "
9480 "declaration specifiers"),
9484 ("both %<long%> and %<%s%> in "
9485 "declaration specifiers"),
9487 else if (specs
->short_p
)
9489 ("both %<short%> and %<%s%> in "
9490 "declaration specifiers"),
9492 else if (specs
->signed_p
)
9494 ("both %<signed%> and %<%s%> in "
9495 "declaration specifiers"),
9497 else if (specs
->unsigned_p
)
9499 ("both %<unsigned%> and %<%s%> in "
9500 "declaration specifiers"),
9502 else if (specs
->complex_p
)
9504 ("both %<complex%> and %<%s%> in "
9505 "declaration specifiers"),
9507 else if (specs
->saturating_p
)
9509 ("both %<_Sat%> and %<%s%> in "
9510 "declaration specifiers"),
9512 else if (i
== RID_DFLOAT32
)
9513 specs
->typespec_word
= cts_dfloat32
;
9514 else if (i
== RID_DFLOAT64
)
9515 specs
->typespec_word
= cts_dfloat64
;
9517 specs
->typespec_word
= cts_dfloat128
;
9519 if (!targetm
.decimal_float_supported_p ())
9521 ("decimal floating point not supported "
9522 "for this target"));
9523 pedwarn (loc
, OPT_pedantic
,
9524 "ISO C does not support decimal floating point");
9534 if (specs
->complex_p
)
9536 ("both %<complex%> and %<%s%> in "
9537 "declaration specifiers"),
9539 else if (i
== RID_FRACT
)
9540 specs
->typespec_word
= cts_fract
;
9542 specs
->typespec_word
= cts_accum
;
9544 if (!targetm
.fixed_point_supported_p ())
9546 "fixed-point types not supported for this target");
9547 pedwarn (loc
, OPT_pedantic
,
9548 "ISO C does not support fixed-point types");
9551 /* ObjC reserved word "id", handled below. */
9557 /* Now we have a typedef (a TYPE_DECL node), an identifier (some
9558 form of ObjC type, cases such as "int" and "long" being handled
9559 above), a TYPE (struct, union, enum and typeof specifiers) or an
9560 ERROR_MARK. In none of these cases may there have previously
9561 been any type specifiers. */
9562 if (specs
->type
|| specs
->typespec_word
!= cts_none
9563 || specs
->long_p
|| specs
->short_p
|| specs
->signed_p
9564 || specs
->unsigned_p
|| specs
->complex_p
)
9565 error_at (loc
, "two or more data types in declaration specifiers");
9566 else if (TREE_CODE (type
) == TYPE_DECL
)
9568 if (TREE_TYPE (type
) == error_mark_node
)
9569 ; /* Allow the type to default to int to avoid cascading errors. */
9572 specs
->type
= TREE_TYPE (type
);
9573 specs
->decl_attr
= DECL_ATTRIBUTES (type
);
9574 specs
->typedef_p
= true;
9575 specs
->explicit_signed_p
= C_TYPEDEF_EXPLICITLY_SIGNED (type
);
9577 /* If this typedef name is defined in a struct, then a C++
9578 lookup would return a different value. */
9580 && I_SYMBOL_BINDING (DECL_NAME (type
))->in_struct
)
9581 warning_at (loc
, OPT_Wc___compat
,
9582 "C++ lookup of %qD would return a field, not a type",
9585 /* If we are parsing a struct, record that a struct field
9587 if (warn_cxx_compat
&& struct_parse_info
!= NULL
)
9588 VEC_safe_push (tree
, heap
, struct_parse_info
->typedefs_seen
, type
);
9591 else if (TREE_CODE (type
) == IDENTIFIER_NODE
)
9593 tree t
= lookup_name (type
);
9594 if (!t
|| TREE_CODE (t
) != TYPE_DECL
)
9595 error_at (loc
, "%qE fails to be a typedef or built in type", type
);
9596 else if (TREE_TYPE (t
) == error_mark_node
)
9599 specs
->type
= TREE_TYPE (t
);
9603 if (TREE_CODE (type
) != ERROR_MARK
&& spec
.kind
== ctsk_typeof
)
9605 specs
->typedef_p
= true;
9609 specs
->expr
= build2 (COMPOUND_EXPR
, TREE_TYPE (spec
.expr
),
9610 specs
->expr
, spec
.expr
);
9612 specs
->expr
= spec
.expr
;
9613 specs
->expr_const_operands
&= spec
.expr_const_operands
;
9622 /* Add the storage class specifier or function specifier SCSPEC to the
9623 declaration specifiers SPECS, returning SPECS. */
9625 struct c_declspecs
*
9626 declspecs_add_scspec (struct c_declspecs
*specs
, tree scspec
)
9629 enum c_storage_class n
= csc_none
;
9631 specs
->declspecs_seen_p
= true;
9632 gcc_assert (TREE_CODE (scspec
) == IDENTIFIER_NODE
9633 && C_IS_RESERVED_WORD (scspec
));
9634 i
= C_RID_CODE (scspec
);
9635 if (specs
->non_sc_seen_p
)
9636 warning (OPT_Wold_style_declaration
,
9637 "%qE is not at beginning of declaration", scspec
);
9641 /* C99 permits duplicate inline. Although of doubtful utility,
9642 it seems simplest to permit it in gnu89 mode as well, as
9643 there is also little utility in maintaining this as a
9644 difference between gnu89 and C99 inline. */
9646 specs
->inline_p
= true;
9649 /* Duplicate _Noreturn is permitted. */
9651 specs
->noreturn_p
= true;
9654 dupe
= specs
->thread_p
;
9655 if (specs
->storage_class
== csc_auto
)
9656 error ("%<__thread%> used with %<auto%>");
9657 else if (specs
->storage_class
== csc_register
)
9658 error ("%<__thread%> used with %<register%>");
9659 else if (specs
->storage_class
== csc_typedef
)
9660 error ("%<__thread%> used with %<typedef%>");
9662 specs
->thread_p
= true;
9669 /* Diagnose "__thread extern". */
9670 if (specs
->thread_p
)
9671 error ("%<__thread%> before %<extern%>");
9678 /* Diagnose "__thread static". */
9679 if (specs
->thread_p
)
9680 error ("%<__thread%> before %<static%>");
9688 if (n
!= csc_none
&& n
== specs
->storage_class
)
9691 error ("duplicate %qE", scspec
);
9694 if (specs
->storage_class
!= csc_none
&& n
!= specs
->storage_class
)
9696 error ("multiple storage classes in declaration specifiers");
9700 specs
->storage_class
= n
;
9701 if (n
!= csc_extern
&& n
!= csc_static
&& specs
->thread_p
)
9703 error ("%<__thread%> used with %qE", scspec
);
9704 specs
->thread_p
= false;
9711 /* Add the attributes ATTRS to the declaration specifiers SPECS,
9714 struct c_declspecs
*
9715 declspecs_add_attrs (struct c_declspecs
*specs
, tree attrs
)
9717 specs
->attrs
= chainon (attrs
, specs
->attrs
);
9718 specs
->declspecs_seen_p
= true;
9722 /* Combine "long", "short", "signed", "unsigned" and "_Complex" type
9723 specifiers with any other type specifier to determine the resulting
9724 type. This is where ISO C checks on complex types are made, since
9725 "_Complex long" is a prefix of the valid ISO C type "_Complex long
9728 struct c_declspecs
*
9729 finish_declspecs (struct c_declspecs
*specs
)
9731 /* If a type was specified as a whole, we have no modifiers and are
9733 if (specs
->type
!= NULL_TREE
)
9735 gcc_assert (!specs
->long_p
&& !specs
->long_long_p
&& !specs
->short_p
9736 && !specs
->signed_p
&& !specs
->unsigned_p
9737 && !specs
->complex_p
);
9739 /* Set a dummy type. */
9740 if (TREE_CODE (specs
->type
) == ERROR_MARK
)
9741 specs
->type
= integer_type_node
;
9745 /* If none of "void", "_Bool", "char", "int", "float" or "double"
9746 has been specified, treat it as "int" unless "_Complex" is
9747 present and there are no other specifiers. If we just have
9748 "_Complex", it is equivalent to "_Complex double", but e.g.
9749 "_Complex short" is equivalent to "_Complex short int". */
9750 if (specs
->typespec_word
== cts_none
)
9752 if (specs
->saturating_p
)
9754 error ("%<_Sat%> is used without %<_Fract%> or %<_Accum%>");
9755 if (!targetm
.fixed_point_supported_p ())
9756 error ("fixed-point types not supported for this target");
9757 specs
->typespec_word
= cts_fract
;
9759 else if (specs
->long_p
|| specs
->short_p
9760 || specs
->signed_p
|| specs
->unsigned_p
)
9762 specs
->typespec_word
= cts_int
;
9764 else if (specs
->complex_p
)
9766 specs
->typespec_word
= cts_double
;
9767 pedwarn (input_location
, OPT_pedantic
,
9768 "ISO C does not support plain %<complex%> meaning "
9769 "%<double complex%>");
9773 specs
->typespec_word
= cts_int
;
9774 specs
->default_int_p
= true;
9775 /* We don't diagnose this here because grokdeclarator will
9776 give more specific diagnostics according to whether it is
9777 a function definition. */
9781 /* If "signed" was specified, record this to distinguish "int" and
9782 "signed int" in the case of a bit-field with
9783 -funsigned-bitfields. */
9784 specs
->explicit_signed_p
= specs
->signed_p
;
9786 /* Now compute the actual type. */
9787 switch (specs
->typespec_word
)
9790 gcc_assert (!specs
->long_p
&& !specs
->short_p
9791 && !specs
->signed_p
&& !specs
->unsigned_p
9792 && !specs
->complex_p
);
9793 specs
->type
= void_type_node
;
9796 gcc_assert (!specs
->long_p
&& !specs
->short_p
9797 && !specs
->signed_p
&& !specs
->unsigned_p
9798 && !specs
->complex_p
);
9799 specs
->type
= boolean_type_node
;
9802 gcc_assert (!specs
->long_p
&& !specs
->short_p
);
9803 gcc_assert (!(specs
->signed_p
&& specs
->unsigned_p
));
9804 if (specs
->signed_p
)
9805 specs
->type
= signed_char_type_node
;
9806 else if (specs
->unsigned_p
)
9807 specs
->type
= unsigned_char_type_node
;
9809 specs
->type
= char_type_node
;
9810 if (specs
->complex_p
)
9812 pedwarn (input_location
, OPT_pedantic
,
9813 "ISO C does not support complex integer types");
9814 specs
->type
= build_complex_type (specs
->type
);
9818 gcc_assert (!specs
->long_p
&& !specs
->short_p
&& !specs
->long_long_p
);
9819 gcc_assert (!(specs
->signed_p
&& specs
->unsigned_p
));
9820 specs
->type
= (specs
->unsigned_p
9821 ? int128_unsigned_type_node
9822 : int128_integer_type_node
);
9823 if (specs
->complex_p
)
9825 pedwarn (input_location
, OPT_pedantic
,
9826 "ISO C does not support complex integer types");
9827 specs
->type
= build_complex_type (specs
->type
);
9831 gcc_assert (!(specs
->long_p
&& specs
->short_p
));
9832 gcc_assert (!(specs
->signed_p
&& specs
->unsigned_p
));
9833 if (specs
->long_long_p
)
9834 specs
->type
= (specs
->unsigned_p
9835 ? long_long_unsigned_type_node
9836 : long_long_integer_type_node
);
9837 else if (specs
->long_p
)
9838 specs
->type
= (specs
->unsigned_p
9839 ? long_unsigned_type_node
9840 : long_integer_type_node
);
9841 else if (specs
->short_p
)
9842 specs
->type
= (specs
->unsigned_p
9843 ? short_unsigned_type_node
9844 : short_integer_type_node
);
9846 specs
->type
= (specs
->unsigned_p
9847 ? unsigned_type_node
9848 : integer_type_node
);
9849 if (specs
->complex_p
)
9851 pedwarn (input_location
, OPT_pedantic
,
9852 "ISO C does not support complex integer types");
9853 specs
->type
= build_complex_type (specs
->type
);
9857 gcc_assert (!specs
->long_p
&& !specs
->short_p
9858 && !specs
->signed_p
&& !specs
->unsigned_p
);
9859 specs
->type
= (specs
->complex_p
9860 ? complex_float_type_node
9864 gcc_assert (!specs
->long_long_p
&& !specs
->short_p
9865 && !specs
->signed_p
&& !specs
->unsigned_p
);
9868 specs
->type
= (specs
->complex_p
9869 ? complex_long_double_type_node
9870 : long_double_type_node
);
9874 specs
->type
= (specs
->complex_p
9875 ? complex_double_type_node
9876 : double_type_node
);
9882 gcc_assert (!specs
->long_p
&& !specs
->long_long_p
&& !specs
->short_p
9883 && !specs
->signed_p
&& !specs
->unsigned_p
&& !specs
->complex_p
);
9884 if (specs
->typespec_word
== cts_dfloat32
)
9885 specs
->type
= dfloat32_type_node
;
9886 else if (specs
->typespec_word
== cts_dfloat64
)
9887 specs
->type
= dfloat64_type_node
;
9889 specs
->type
= dfloat128_type_node
;
9892 gcc_assert (!specs
->complex_p
);
9893 if (!targetm
.fixed_point_supported_p ())
9894 specs
->type
= integer_type_node
;
9895 else if (specs
->saturating_p
)
9897 if (specs
->long_long_p
)
9898 specs
->type
= specs
->unsigned_p
9899 ? sat_unsigned_long_long_fract_type_node
9900 : sat_long_long_fract_type_node
;
9901 else if (specs
->long_p
)
9902 specs
->type
= specs
->unsigned_p
9903 ? sat_unsigned_long_fract_type_node
9904 : sat_long_fract_type_node
;
9905 else if (specs
->short_p
)
9906 specs
->type
= specs
->unsigned_p
9907 ? sat_unsigned_short_fract_type_node
9908 : sat_short_fract_type_node
;
9910 specs
->type
= specs
->unsigned_p
9911 ? sat_unsigned_fract_type_node
9912 : sat_fract_type_node
;
9916 if (specs
->long_long_p
)
9917 specs
->type
= specs
->unsigned_p
9918 ? unsigned_long_long_fract_type_node
9919 : long_long_fract_type_node
;
9920 else if (specs
->long_p
)
9921 specs
->type
= specs
->unsigned_p
9922 ? unsigned_long_fract_type_node
9923 : long_fract_type_node
;
9924 else if (specs
->short_p
)
9925 specs
->type
= specs
->unsigned_p
9926 ? unsigned_short_fract_type_node
9927 : short_fract_type_node
;
9929 specs
->type
= specs
->unsigned_p
9930 ? unsigned_fract_type_node
9935 gcc_assert (!specs
->complex_p
);
9936 if (!targetm
.fixed_point_supported_p ())
9937 specs
->type
= integer_type_node
;
9938 else if (specs
->saturating_p
)
9940 if (specs
->long_long_p
)
9941 specs
->type
= specs
->unsigned_p
9942 ? sat_unsigned_long_long_accum_type_node
9943 : sat_long_long_accum_type_node
;
9944 else if (specs
->long_p
)
9945 specs
->type
= specs
->unsigned_p
9946 ? sat_unsigned_long_accum_type_node
9947 : sat_long_accum_type_node
;
9948 else if (specs
->short_p
)
9949 specs
->type
= specs
->unsigned_p
9950 ? sat_unsigned_short_accum_type_node
9951 : sat_short_accum_type_node
;
9953 specs
->type
= specs
->unsigned_p
9954 ? sat_unsigned_accum_type_node
9955 : sat_accum_type_node
;
9959 if (specs
->long_long_p
)
9960 specs
->type
= specs
->unsigned_p
9961 ? unsigned_long_long_accum_type_node
9962 : long_long_accum_type_node
;
9963 else if (specs
->long_p
)
9964 specs
->type
= specs
->unsigned_p
9965 ? unsigned_long_accum_type_node
9966 : long_accum_type_node
;
9967 else if (specs
->short_p
)
9968 specs
->type
= specs
->unsigned_p
9969 ? unsigned_short_accum_type_node
9970 : short_accum_type_node
;
9972 specs
->type
= specs
->unsigned_p
9973 ? unsigned_accum_type_node
9984 /* A subroutine of c_write_global_declarations. Perform final processing
9985 on one file scope's declarations (or the external scope's declarations),
9989 c_write_global_declarations_1 (tree globals
)
9994 /* Process the decls in the order they were written. */
9995 for (decl
= globals
; decl
; decl
= DECL_CHAIN (decl
))
9997 /* Check for used but undefined static functions using the C
9998 standard's definition of "used", and set TREE_NO_WARNING so
9999 that check_global_declarations doesn't repeat the check. */
10000 if (TREE_CODE (decl
) == FUNCTION_DECL
10001 && DECL_INITIAL (decl
) == 0
10002 && DECL_EXTERNAL (decl
)
10003 && !TREE_PUBLIC (decl
)
10004 && C_DECL_USED (decl
))
10006 pedwarn (input_location
, 0, "%q+F used but never defined", decl
);
10007 TREE_NO_WARNING (decl
) = 1;
10010 wrapup_global_declaration_1 (decl
);
10015 reconsider
= false;
10016 for (decl
= globals
; decl
; decl
= DECL_CHAIN (decl
))
10017 reconsider
|= wrapup_global_declaration_2 (decl
);
10019 while (reconsider
);
10021 for (decl
= globals
; decl
; decl
= DECL_CHAIN (decl
))
10022 check_global_declaration_1 (decl
);
10025 /* A subroutine of c_write_global_declarations Emit debug information for each
10026 of the declarations in GLOBALS. */
10029 c_write_global_declarations_2 (tree globals
)
10033 for (decl
= globals
; decl
; decl
= DECL_CHAIN (decl
))
10034 debug_hooks
->global_decl (decl
);
10037 /* Callback to collect a source_ref from a DECL. */
10040 collect_source_ref_cb (tree decl
)
10042 if (!DECL_IS_BUILTIN (decl
))
10043 collect_source_ref (LOCATION_FILE (decl_sloc (decl
, false)));
10046 /* Collect all references relevant to SOURCE_FILE. */
10049 collect_all_refs (const char *source_file
)
10054 FOR_EACH_VEC_ELT (tree
, all_translation_units
, i
, t
)
10055 collect_ada_nodes (BLOCK_VARS (DECL_INITIAL (t
)), source_file
);
10058 /* Iterate over all global declarations and call CALLBACK. */
10061 for_each_global_decl (void (*callback
) (tree decl
))
10068 FOR_EACH_VEC_ELT (tree
, all_translation_units
, i
, t
)
10070 decls
= DECL_INITIAL (t
);
10071 for (decl
= BLOCK_VARS (decls
); decl
; decl
= TREE_CHAIN (decl
))
10076 /* Preserve the external declarations scope across a garbage collect. */
10077 static GTY(()) tree ext_block
;
10080 c_write_global_declarations (void)
10085 /* We don't want to do this if generating a PCH. */
10089 timevar_start (TV_PHASE_DEFERRED
);
10091 /* Do the Objective-C stuff. This is where all the Objective-C
10092 module stuff gets generated (symtab, class/protocol/selector
10094 if (c_dialect_objc ())
10095 objc_write_global_declarations ();
10097 /* Close the external scope. */
10098 ext_block
= pop_scope ();
10099 external_scope
= 0;
10100 gcc_assert (!current_scope
);
10102 /* Handle -fdump-ada-spec[-slim]. */
10103 if (dump_enabled_p (TDI_ada
))
10105 /* Build a table of files to generate specs for */
10106 if (get_dump_file_info (TDI_ada
)->flags
& TDF_SLIM
)
10107 collect_source_ref (main_input_filename
);
10109 for_each_global_decl (collect_source_ref_cb
);
10111 dump_ada_specs (collect_all_refs
, NULL
);
10116 tree tmp
= BLOCK_VARS (ext_block
);
10118 FILE * stream
= dump_begin (TDI_tu
, &flags
);
10121 dump_node (tmp
, flags
& ~TDF_SLIM
, stream
);
10122 dump_end (TDI_tu
, stream
);
10126 /* Process all file scopes in this compilation, and the external_scope,
10127 through wrapup_global_declarations and check_global_declarations. */
10128 FOR_EACH_VEC_ELT (tree
, all_translation_units
, i
, t
)
10129 c_write_global_declarations_1 (BLOCK_VARS (DECL_INITIAL (t
)));
10130 c_write_global_declarations_1 (BLOCK_VARS (ext_block
));
10132 timevar_stop (TV_PHASE_DEFERRED
);
10133 timevar_start (TV_PHASE_CGRAPH
);
10135 /* We're done parsing; proceed to optimize and emit assembly.
10136 FIXME: shouldn't be the front end's responsibility to call this. */
10137 cgraph_finalize_compilation_unit ();
10139 timevar_stop (TV_PHASE_CGRAPH
);
10140 timevar_start (TV_PHASE_DBGINFO
);
10142 /* After cgraph has had a chance to emit everything that's going to
10143 be emitted, output debug information for globals. */
10144 if (!seen_error ())
10146 timevar_push (TV_SYMOUT
);
10147 FOR_EACH_VEC_ELT (tree
, all_translation_units
, i
, t
)
10148 c_write_global_declarations_2 (BLOCK_VARS (DECL_INITIAL (t
)));
10149 c_write_global_declarations_2 (BLOCK_VARS (ext_block
));
10150 timevar_pop (TV_SYMOUT
);
10154 timevar_stop (TV_PHASE_DBGINFO
);
10157 /* Register reserved keyword WORD as qualifier for address space AS. */
10160 c_register_addr_space (const char *word
, addr_space_t as
)
10162 int rid
= RID_FIRST_ADDR_SPACE
+ as
;
10165 /* Address space qualifiers are only supported
10166 in C with GNU extensions enabled. */
10167 if (c_dialect_objc () || flag_no_asm
)
10170 id
= get_identifier (word
);
10171 C_SET_RID_CODE (id
, rid
);
10172 C_IS_RESERVED_WORD (id
) = 1;
10173 ridpointers
[rid
] = id
;
10176 #include "gt-c-decl.h"