1 /* Process declarations and variables for C compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
3 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
4 Free Software Foundation, Inc.
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 3, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
22 /* Process declarations and symbol lookup for C front end.
23 Also constructs types; the standard scalar types at initialization,
24 and structure, union, array and enum types when they are declared. */
26 /* ??? not all decl nodes are given the most useful possible
27 line numbers. For example, the CONST_DECLs for enum values. */
31 #include "coretypes.h"
36 #include "tree-inline.h"
48 #include "c-family/c-common.h"
49 #include "c-family/c-pragma.h"
51 #include "langhooks.h"
52 #include "tree-mudflap.h"
53 #include "tree-iterator.h"
54 #include "diagnostic-core.h"
55 #include "tree-dump.h"
58 #include "langhooks-def.h"
59 #include "pointer-set.h"
61 #include "c-family/c-ada-spec.h"
63 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
65 { NORMAL
, /* Ordinary declaration */
66 FUNCDEF
, /* Function definition */
67 PARM
, /* Declaration of parm before function body */
68 FIELD
, /* Declaration inside struct or union */
69 TYPENAME
}; /* Typename (inside cast or sizeof) */
71 /* States indicating how grokdeclarator() should handle declspecs marked
72 with __attribute__((deprecated)). An object declared as
73 __attribute__((deprecated)) suppresses warnings of uses of other
76 enum deprecated_states
{
82 /* Nonzero if we have seen an invalid cross reference
83 to a struct, union, or enum, but not yet printed the message. */
84 tree pending_invalid_xref
;
86 /* File and line to appear in the eventual error message. */
87 location_t pending_invalid_xref_location
;
89 /* The file and line that the prototype came from if this is an
90 old-style definition; used for diagnostics in
91 store_parm_decls_oldstyle. */
93 static location_t current_function_prototype_locus
;
95 /* Whether this prototype was built-in. */
97 static bool current_function_prototype_built_in
;
99 /* The argument type information of this prototype. */
101 static tree current_function_prototype_arg_types
;
103 /* The argument information structure for the function currently being
106 static struct c_arg_info
*current_function_arg_info
;
108 /* The obstack on which parser and related data structures, which are
109 not live beyond their top-level declaration or definition, are
111 struct obstack parser_obstack
;
113 /* The current statement tree. */
115 static GTY(()) struct stmt_tree_s c_stmt_tree
;
117 /* State saving variables. */
121 /* Linked list of TRANSLATION_UNIT_DECLS for the translation units
122 included in this invocation. Note that the current translation
123 unit is not included in this list. */
125 static GTY(()) tree all_translation_units
;
127 /* A list of decls to be made automatically visible in each file scope. */
128 static GTY(()) tree visible_builtins
;
130 /* Set to 0 at beginning of a function definition, set to 1 if
131 a return statement that specifies a return value is seen. */
133 int current_function_returns_value
;
135 /* Set to 0 at beginning of a function definition, set to 1 if
136 a return statement with no argument is seen. */
138 int current_function_returns_null
;
140 /* Set to 0 at beginning of a function definition, set to 1 if
141 a call to a noreturn function is seen. */
143 int current_function_returns_abnormally
;
145 /* Set to nonzero by `grokdeclarator' for a function
146 whose return type is defaulted, if warnings for this are desired. */
148 static int warn_about_return_type
;
150 /* Nonzero when the current toplevel function contains a declaration
151 of a nested function which is never defined. */
153 static bool undef_nested_function
;
155 /* True means global_bindings_p should return false even if the scope stack
156 says we are in file scope. */
157 bool c_override_global_bindings_to_false
;
160 /* Each c_binding structure describes one binding of an identifier to
161 a decl. All the decls in a scope - irrespective of namespace - are
162 chained together by the ->prev field, which (as the name implies)
163 runs in reverse order. All the decls in a given namespace bound to
164 a given identifier are chained by the ->shadowed field, which runs
165 from inner to outer scopes.
167 The ->decl field usually points to a DECL node, but there are two
168 exceptions. In the namespace of type tags, the bound entity is a
169 RECORD_TYPE, UNION_TYPE, or ENUMERAL_TYPE node. If an undeclared
170 identifier is encountered, it is bound to error_mark_node to
171 suppress further errors about that identifier in the current
174 The ->u.type field stores the type of the declaration in this scope;
175 if NULL, the type is the type of the ->decl field. This is only of
176 relevance for objects with external or internal linkage which may
177 be redeclared in inner scopes, forming composite types that only
178 persist for the duration of those scopes. In the external scope,
179 this stores the composite of all the types declared for this
180 object, visible or not. The ->inner_comp field (used only at file
181 scope) stores whether an incomplete array type at file scope was
182 completed at an inner scope to an array size other than 1.
184 The ->u.label field is used for labels. It points to a structure
185 which stores additional information used for warnings.
187 The depth field is copied from the scope structure that holds this
188 decl. It is used to preserve the proper ordering of the ->shadowed
189 field (see bind()) and also for a handful of special-case checks.
190 Finally, the invisible bit is true for a decl which should be
191 ignored for purposes of normal name lookup, and the nested bit is
192 true for a decl that's been bound a second time in an inner scope;
193 in all such cases, the binding in the outer scope will have its
194 invisible bit true. */
196 struct GTY((chain_next ("%h.prev"))) c_binding
{
197 union GTY(()) { /* first so GTY desc can use decl */
198 tree
GTY((tag ("0"))) type
; /* the type in this scope */
199 struct c_label_vars
* GTY((tag ("1"))) label
; /* for warnings */
200 } GTY((desc ("TREE_CODE (%0.decl) == LABEL_DECL"))) u
;
201 tree decl
; /* the decl bound */
202 tree id
; /* the identifier it's bound to */
203 struct c_binding
*prev
; /* the previous decl in this scope */
204 struct c_binding
*shadowed
; /* the innermost decl shadowed by this one */
205 unsigned int depth
: 28; /* depth of this scope */
206 BOOL_BITFIELD invisible
: 1; /* normal lookup should ignore this binding */
207 BOOL_BITFIELD nested
: 1; /* do not set DECL_CONTEXT when popping */
208 BOOL_BITFIELD inner_comp
: 1; /* incomplete array completed in inner scope */
209 BOOL_BITFIELD in_struct
: 1; /* currently defined as struct field */
210 location_t locus
; /* location for nested bindings */
212 #define B_IN_SCOPE(b1, b2) ((b1)->depth == (b2)->depth)
213 #define B_IN_CURRENT_SCOPE(b) ((b)->depth == current_scope->depth)
214 #define B_IN_FILE_SCOPE(b) ((b)->depth == 1 /*file_scope->depth*/)
215 #define B_IN_EXTERNAL_SCOPE(b) ((b)->depth == 0 /*external_scope->depth*/)
217 #define I_SYMBOL_BINDING(node) \
218 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->symbol_binding)
219 #define I_SYMBOL_DECL(node) \
220 (I_SYMBOL_BINDING(node) ? I_SYMBOL_BINDING(node)->decl : 0)
222 #define I_TAG_BINDING(node) \
223 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->tag_binding)
224 #define I_TAG_DECL(node) \
225 (I_TAG_BINDING(node) ? I_TAG_BINDING(node)->decl : 0)
227 #define I_LABEL_BINDING(node) \
228 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->label_binding)
229 #define I_LABEL_DECL(node) \
230 (I_LABEL_BINDING(node) ? I_LABEL_BINDING(node)->decl : 0)
232 /* Each C symbol points to three linked lists of c_binding structures.
233 These describe the values of the identifier in the three different
234 namespaces defined by the language. */
236 struct GTY(()) lang_identifier
{
237 struct c_common_identifier common_id
;
238 struct c_binding
*symbol_binding
; /* vars, funcs, constants, typedefs */
239 struct c_binding
*tag_binding
; /* struct/union/enum tags */
240 struct c_binding
*label_binding
; /* labels */
243 /* Validate c-lang.c's assumptions. */
244 extern char C_SIZEOF_STRUCT_LANG_IDENTIFIER_isnt_accurate
245 [(sizeof(struct lang_identifier
) == C_SIZEOF_STRUCT_LANG_IDENTIFIER
) ? 1 : -1];
247 /* The resulting tree type. */
249 union GTY((desc ("TREE_CODE (&%h.generic) == IDENTIFIER_NODE"),
250 chain_next ("TREE_CODE (&%h.generic) == INTEGER_TYPE ? (union lang_tree_node *) TYPE_NEXT_VARIANT (&%h.generic) : ((union lang_tree_node *) TREE_CHAIN (&%h.generic))"))) lang_tree_node
252 union tree_node
GTY ((tag ("0"),
253 desc ("tree_node_structure (&%h)")))
255 struct lang_identifier
GTY ((tag ("1"))) identifier
;
258 /* Track bindings and other things that matter for goto warnings. For
259 efficiency, we do not gather all the decls at the point of
260 definition. Instead, we point into the bindings structure. As
261 scopes are popped, we update these structures and gather the decls
262 that matter at that time. */
264 struct GTY(()) c_spot_bindings
{
265 /* The currently open scope which holds bindings defined when the
266 label was defined or the goto statement was found. */
267 struct c_scope
*scope
;
268 /* The bindings in the scope field which were defined at the point
269 of the label or goto. This lets us look at older or newer
270 bindings in the scope, as appropriate. */
271 struct c_binding
*bindings_in_scope
;
272 /* The number of statement expressions that have started since this
273 label or goto statement was defined. This is zero if we are at
274 the same statement expression level. It is positive if we are in
275 a statement expression started since this spot. It is negative
276 if this spot was in a statement expression and we have left
279 /* Whether we started in a statement expression but are no longer in
280 it. This is set to true if stmt_exprs ever goes negative. */
284 /* This structure is used to keep track of bindings seen when a goto
285 statement is defined. This is only used if we see the goto
286 statement before we see the label. */
288 struct GTY(()) c_goto_bindings
{
289 /* The location of the goto statement. */
291 /* The bindings of the goto statement. */
292 struct c_spot_bindings goto_bindings
;
295 typedef struct c_goto_bindings
*c_goto_bindings_p
;
296 DEF_VEC_P(c_goto_bindings_p
);
297 DEF_VEC_ALLOC_P(c_goto_bindings_p
,gc
);
299 /* The additional information we keep track of for a label binding.
300 These fields are updated as scopes are popped. */
302 struct GTY(()) c_label_vars
{
303 /* The shadowed c_label_vars, when one label shadows another (which
304 can only happen using a __label__ declaration). */
305 struct c_label_vars
*shadowed
;
306 /* The bindings when the label was defined. */
307 struct c_spot_bindings label_bindings
;
308 /* A list of decls that we care about: decls about which we should
309 warn if a goto branches to this label from later in the function.
310 Decls are added to this list as scopes are popped. We only add
311 the decls that matter. */
312 VEC(tree
,gc
) *decls_in_scope
;
313 /* A list of goto statements to this label. This is only used for
314 goto statements seen before the label was defined, so that we can
315 issue appropriate warnings for them. */
316 VEC(c_goto_bindings_p
,gc
) *gotos
;
319 /* Each c_scope structure describes the complete contents of one
320 scope. Four scopes are distinguished specially: the innermost or
321 current scope, the innermost function scope, the file scope (always
322 the second to outermost) and the outermost or external scope.
324 Most declarations are recorded in the current scope.
326 All normal label declarations are recorded in the innermost
327 function scope, as are bindings of undeclared identifiers to
328 error_mark_node. (GCC permits nested functions as an extension,
329 hence the 'innermost' qualifier.) Explicitly declared labels
330 (using the __label__ extension) appear in the current scope.
332 Being in the file scope (current_scope == file_scope) causes
333 special behavior in several places below. Also, under some
334 conditions the Objective-C front end records declarations in the
335 file scope even though that isn't the current scope.
337 All declarations with external linkage are recorded in the external
338 scope, even if they aren't visible there; this models the fact that
339 such declarations are visible to the entire program, and (with a
340 bit of cleverness, see pushdecl) allows diagnosis of some violations
341 of C99 6.2.2p7 and 6.2.7p2:
343 If, within the same translation unit, the same identifier appears
344 with both internal and external linkage, the behavior is
347 All declarations that refer to the same object or function shall
348 have compatible type; otherwise, the behavior is undefined.
350 Initially only the built-in declarations, which describe compiler
351 intrinsic functions plus a subset of the standard library, are in
354 The order of the blocks list matters, and it is frequently appended
355 to. To avoid having to walk all the way to the end of the list on
356 each insertion, or reverse the list later, we maintain a pointer to
357 the last list entry. (FIXME: It should be feasible to use a reversed
360 The bindings list is strictly in reverse order of declarations;
361 pop_scope relies on this. */
364 struct GTY((chain_next ("%h.outer"))) c_scope
{
365 /* The scope containing this one. */
366 struct c_scope
*outer
;
368 /* The next outermost function scope. */
369 struct c_scope
*outer_function
;
371 /* All bindings in this scope. */
372 struct c_binding
*bindings
;
374 /* For each scope (except the global one), a chain of BLOCK nodes
375 for all the scopes that were entered and exited one level down. */
379 /* The depth of this scope. Used to keep the ->shadowed chain of
380 bindings sorted innermost to outermost. */
381 unsigned int depth
: 28;
383 /* True if we are currently filling this scope with parameter
385 BOOL_BITFIELD parm_flag
: 1;
387 /* True if we saw [*] in this scope. Used to give an error messages
388 if these appears in a function definition. */
389 BOOL_BITFIELD had_vla_unspec
: 1;
391 /* True if we already complained about forward parameter decls
392 in this scope. This prevents double warnings on
393 foo (int a; int b; ...) */
394 BOOL_BITFIELD warned_forward_parm_decls
: 1;
396 /* True if this is the outermost block scope of a function body.
397 This scope contains the parameters, the local variables declared
398 in the outermost block, and all the labels (except those in
399 nested functions, or declared at block scope with __label__). */
400 BOOL_BITFIELD function_body
: 1;
402 /* True means make a BLOCK for this scope no matter what. */
403 BOOL_BITFIELD keep
: 1;
405 /* True means that an unsuffixed float constant is _Decimal64. */
406 BOOL_BITFIELD float_const_decimal64
: 1;
408 /* True if this scope has any label bindings. This is used to speed
409 up searching for labels when popping scopes, particularly since
410 labels are normally only found at function scope. */
411 BOOL_BITFIELD has_label_bindings
: 1;
414 /* The scope currently in effect. */
416 static GTY(()) struct c_scope
*current_scope
;
418 /* The innermost function scope. Ordinary (not explicitly declared)
419 labels, bindings to error_mark_node, and the lazily-created
420 bindings of __func__ and its friends get this scope. */
422 static GTY(()) struct c_scope
*current_function_scope
;
424 /* The C file scope. This is reset for each input translation unit. */
426 static GTY(()) struct c_scope
*file_scope
;
428 /* The outermost scope. This is used for all declarations with
429 external linkage, and only these, hence the name. */
431 static GTY(()) struct c_scope
*external_scope
;
433 /* A chain of c_scope structures awaiting reuse. */
435 static GTY((deletable
)) struct c_scope
*scope_freelist
;
437 /* A chain of c_binding structures awaiting reuse. */
439 static GTY((deletable
)) struct c_binding
*binding_freelist
;
441 /* Append VAR to LIST in scope SCOPE. */
442 #define SCOPE_LIST_APPEND(scope, list, decl) do { \
443 struct c_scope *s_ = (scope); \
445 if (s_->list##_last) \
446 BLOCK_CHAIN (s_->list##_last) = d_; \
449 s_->list##_last = d_; \
452 /* Concatenate FROM in scope FSCOPE onto TO in scope TSCOPE. */
453 #define SCOPE_LIST_CONCAT(tscope, to, fscope, from) do { \
454 struct c_scope *t_ = (tscope); \
455 struct c_scope *f_ = (fscope); \
457 BLOCK_CHAIN (t_->to##_last) = f_->from; \
460 t_->to##_last = f_->from##_last; \
463 /* A c_inline_static structure stores details of a static identifier
464 referenced in a definition of a function that may be an inline
465 definition if no subsequent declaration of that function uses
466 "extern" or does not use "inline". */
468 struct GTY((chain_next ("%h.next"))) c_inline_static
{
469 /* The location for a diagnostic. */
472 /* The function that may be an inline definition. */
475 /* The object or function referenced. */
478 /* What sort of reference this is. */
479 enum c_inline_static_type type
;
481 /* The next such structure or NULL. */
482 struct c_inline_static
*next
;
485 /* List of static identifiers used or referenced in functions that may
486 be inline definitions. */
487 static GTY(()) struct c_inline_static
*c_inline_statics
;
489 /* True means unconditionally make a BLOCK for the next scope pushed. */
491 static bool keep_next_level_flag
;
493 /* True means the next call to push_scope will be the outermost scope
494 of a function body, so do not push a new scope, merely cease
495 expecting parameter decls. */
497 static bool next_is_function_body
;
499 /* A VEC of pointers to c_binding structures. */
501 typedef struct c_binding
*c_binding_ptr
;
502 DEF_VEC_P(c_binding_ptr
);
503 DEF_VEC_ALLOC_P(c_binding_ptr
,heap
);
505 /* Information that we keep for a struct or union while it is being
508 struct c_struct_parse_info
510 /* If warn_cxx_compat, a list of types defined within this
512 VEC(tree
,heap
) *struct_types
;
513 /* If warn_cxx_compat, a list of field names which have bindings,
514 and which are defined in this struct, but which are not defined
515 in any enclosing struct. This is used to clear the in_struct
516 field of the c_bindings structure. */
517 VEC(c_binding_ptr
,heap
) *fields
;
518 /* If warn_cxx_compat, a list of typedef names used when defining
519 fields in this struct. */
520 VEC(tree
,heap
) *typedefs_seen
;
523 /* Information for the struct or union currently being parsed, or
524 NULL if not parsing a struct or union. */
525 static struct c_struct_parse_info
*struct_parse_info
;
527 /* Forward declarations. */
528 static tree
lookup_name_in_scope (tree
, struct c_scope
*);
529 static tree
c_make_fname_decl (location_t
, tree
, int);
530 static tree
grokdeclarator (const struct c_declarator
*,
531 struct c_declspecs
*,
532 enum decl_context
, bool, tree
*, tree
*, tree
*,
533 bool *, enum deprecated_states
);
534 static tree
grokparms (struct c_arg_info
*, bool);
535 static void layout_array_type (tree
);
537 /* T is a statement. Add it to the statement-tree. This is the
538 C/ObjC version--C++ has a slightly different version of this
544 enum tree_code code
= TREE_CODE (t
);
546 if (CAN_HAVE_LOCATION_P (t
) && code
!= LABEL_EXPR
)
548 if (!EXPR_HAS_LOCATION (t
))
549 SET_EXPR_LOCATION (t
, input_location
);
552 if (code
== LABEL_EXPR
|| code
== CASE_LABEL_EXPR
)
553 STATEMENT_LIST_HAS_LABEL (cur_stmt_list
) = 1;
555 /* Add T to the statement-tree. Non-side-effect statements need to be
556 recorded during statement expressions. */
557 append_to_statement_list_force (t
, &cur_stmt_list
);
564 c_print_identifier (FILE *file
, tree node
, int indent
)
566 print_node (file
, "symbol", I_SYMBOL_DECL (node
), indent
+ 4);
567 print_node (file
, "tag", I_TAG_DECL (node
), indent
+ 4);
568 print_node (file
, "label", I_LABEL_DECL (node
), indent
+ 4);
569 if (C_IS_RESERVED_WORD (node
) && C_RID_CODE (node
) != RID_CXX_COMPAT_WARN
)
571 tree rid
= ridpointers
[C_RID_CODE (node
)];
572 indent_to (file
, indent
+ 4);
573 fprintf (file
, "rid " HOST_PTR_PRINTF
" \"%s\"",
574 (void *) rid
, IDENTIFIER_POINTER (rid
));
578 /* Establish a binding between NAME, an IDENTIFIER_NODE, and DECL,
579 which may be any of several kinds of DECL or TYPE or error_mark_node,
580 in the scope SCOPE. */
582 bind (tree name
, tree decl
, struct c_scope
*scope
, bool invisible
,
583 bool nested
, location_t locus
)
585 struct c_binding
*b
, **here
;
587 if (binding_freelist
)
589 b
= binding_freelist
;
590 binding_freelist
= b
->prev
;
593 b
= ggc_alloc_c_binding ();
598 b
->depth
= scope
->depth
;
599 b
->invisible
= invisible
;
607 b
->prev
= scope
->bindings
;
613 switch (TREE_CODE (decl
))
615 case LABEL_DECL
: here
= &I_LABEL_BINDING (name
); break;
618 case RECORD_TYPE
: here
= &I_TAG_BINDING (name
); break;
624 case ERROR_MARK
: here
= &I_SYMBOL_BINDING (name
); break;
630 /* Locate the appropriate place in the chain of shadowed decls
631 to insert this binding. Normally, scope == current_scope and
632 this does nothing. */
633 while (*here
&& (*here
)->depth
> scope
->depth
)
634 here
= &(*here
)->shadowed
;
640 /* Clear the binding structure B, stick it on the binding_freelist,
641 and return the former value of b->prev. This is used by pop_scope
642 and get_parm_info to iterate destructively over all the bindings
643 from a given scope. */
644 static struct c_binding
*
645 free_binding_and_advance (struct c_binding
*b
)
647 struct c_binding
*prev
= b
->prev
;
649 memset (b
, 0, sizeof (struct c_binding
));
650 b
->prev
= binding_freelist
;
651 binding_freelist
= b
;
656 /* Bind a label. Like bind, but skip fields which aren't used for
657 labels, and add the LABEL_VARS value. */
659 bind_label (tree name
, tree label
, struct c_scope
*scope
,
660 struct c_label_vars
*label_vars
)
664 bind (name
, label
, scope
, /*invisible=*/false, /*nested=*/false,
667 scope
->has_label_bindings
= true;
670 gcc_assert (b
->decl
== label
);
671 label_vars
->shadowed
= b
->u
.label
;
672 b
->u
.label
= label_vars
;
675 /* Hook called at end of compilation to assume 1 elt
676 for a file-scope tentative array defn that wasn't complete before. */
679 c_finish_incomplete_decl (tree decl
)
681 if (TREE_CODE (decl
) == VAR_DECL
)
683 tree type
= TREE_TYPE (decl
);
684 if (type
!= error_mark_node
685 && TREE_CODE (type
) == ARRAY_TYPE
686 && !DECL_EXTERNAL (decl
)
687 && TYPE_DOMAIN (type
) == 0)
689 warning_at (DECL_SOURCE_LOCATION (decl
),
690 0, "array %q+D assumed to have one element", decl
);
692 complete_array_type (&TREE_TYPE (decl
), NULL_TREE
, true);
694 layout_decl (decl
, 0);
699 /* Record that inline function FUNC contains a reference (location
700 LOC) to static DECL (file-scope or function-local according to
704 record_inline_static (location_t loc
, tree func
, tree decl
,
705 enum c_inline_static_type type
)
707 struct c_inline_static
*csi
= ggc_alloc_c_inline_static ();
709 csi
->function
= func
;
710 csi
->static_decl
= decl
;
712 csi
->next
= c_inline_statics
;
713 c_inline_statics
= csi
;
716 /* Check for references to static declarations in inline functions at
717 the end of the translation unit and diagnose them if the functions
718 are still inline definitions. */
721 check_inline_statics (void)
723 struct c_inline_static
*csi
;
724 for (csi
= c_inline_statics
; csi
; csi
= csi
->next
)
726 if (DECL_EXTERNAL (csi
->function
))
730 pedwarn (csi
->location
, 0,
731 "%qD is static but used in inline function %qD "
732 "which is not static", csi
->static_decl
, csi
->function
);
735 pedwarn (csi
->location
, 0,
736 "%q+D is static but declared in inline function %qD "
737 "which is not static", csi
->static_decl
, csi
->function
);
743 c_inline_statics
= NULL
;
746 /* Fill in a c_spot_bindings structure. If DEFINING is true, set it
747 for the current state, otherwise set it to uninitialized. */
750 set_spot_bindings (struct c_spot_bindings
*p
, bool defining
)
754 p
->scope
= current_scope
;
755 p
->bindings_in_scope
= current_scope
->bindings
;
760 p
->bindings_in_scope
= NULL
;
763 p
->left_stmt_expr
= false;
766 /* Return true if we will want to say something if a goto statement
770 decl_jump_unsafe (tree decl
)
772 if (decl
== error_mark_node
|| TREE_TYPE (decl
) == error_mark_node
)
775 /* Always warn about crossing variably modified types. */
776 if ((TREE_CODE (decl
) == VAR_DECL
|| TREE_CODE (decl
) == TYPE_DECL
)
777 && variably_modified_type_p (TREE_TYPE (decl
), NULL_TREE
))
780 /* Otherwise, only warn if -Wgoto-misses-init and this is an
781 initialized automatic decl. */
782 if (warn_jump_misses_init
783 && TREE_CODE (decl
) == VAR_DECL
784 && !TREE_STATIC (decl
)
785 && DECL_INITIAL (decl
) != NULL_TREE
)
791 /* Update spot bindings P as we pop out of SCOPE. Return true if we
792 should push decls for a label. */
795 update_spot_bindings (struct c_scope
*scope
, struct c_spot_bindings
*p
)
797 if (p
->scope
!= scope
)
799 /* This label or goto is defined in some other scope, or it is a
800 label which is not yet defined. There is nothing to
805 /* Adjust the spot bindings to refer to the bindings already defined
806 in the enclosing scope. */
807 p
->scope
= scope
->outer
;
808 p
->bindings_in_scope
= p
->scope
->bindings
;
813 /* The Objective-C front-end often needs to determine the current scope. */
816 objc_get_current_scope (void)
818 return current_scope
;
821 /* The following function is used only by Objective-C. It needs to live here
822 because it accesses the innards of c_scope. */
825 objc_mark_locals_volatile (void *enclosing_blk
)
827 struct c_scope
*scope
;
830 for (scope
= current_scope
;
831 scope
&& scope
!= enclosing_blk
;
832 scope
= scope
->outer
)
834 for (b
= scope
->bindings
; b
; b
= b
->prev
)
835 objc_volatilize_decl (b
->decl
);
837 /* Do not climb up past the current function. */
838 if (scope
->function_body
)
843 /* Nonzero if we are currently in file scope. */
846 global_bindings_p (void)
848 return (current_scope
== file_scope
&& !c_override_global_bindings_to_false
854 keep_next_level (void)
856 keep_next_level_flag
= true;
859 /* Set the flag for the FLOAT_CONST_DECIMAL64 pragma being ON. */
862 set_float_const_decimal64 (void)
864 current_scope
->float_const_decimal64
= true;
867 /* Clear the flag for the FLOAT_CONST_DECIMAL64 pragma. */
870 clear_float_const_decimal64 (void)
872 current_scope
->float_const_decimal64
= false;
875 /* Return nonzero if an unsuffixed float constant is _Decimal64. */
878 float_const_decimal64_p (void)
880 return current_scope
->float_const_decimal64
;
883 /* Identify this scope as currently being filled with parameters. */
886 declare_parm_level (void)
888 current_scope
->parm_flag
= true;
894 if (next_is_function_body
)
896 /* This is the transition from the parameters to the top level
897 of the function body. These are the same scope
898 (C99 6.2.1p4,6) so we do not push another scope structure.
899 next_is_function_body is set only by store_parm_decls, which
900 in turn is called when and only when we are about to
901 encounter the opening curly brace for the function body.
903 The outermost block of a function always gets a BLOCK node,
904 because the debugging output routines expect that each
905 function has at least one BLOCK. */
906 current_scope
->parm_flag
= false;
907 current_scope
->function_body
= true;
908 current_scope
->keep
= true;
909 current_scope
->outer_function
= current_function_scope
;
910 current_function_scope
= current_scope
;
912 keep_next_level_flag
= false;
913 next_is_function_body
= false;
915 /* The FLOAT_CONST_DECIMAL64 pragma applies to nested scopes. */
916 if (current_scope
->outer
)
917 current_scope
->float_const_decimal64
918 = current_scope
->outer
->float_const_decimal64
;
920 current_scope
->float_const_decimal64
= false;
924 struct c_scope
*scope
;
927 scope
= scope_freelist
;
928 scope_freelist
= scope
->outer
;
931 scope
= ggc_alloc_cleared_c_scope ();
933 /* The FLOAT_CONST_DECIMAL64 pragma applies to nested scopes. */
935 scope
->float_const_decimal64
= current_scope
->float_const_decimal64
;
937 scope
->float_const_decimal64
= false;
939 scope
->keep
= keep_next_level_flag
;
940 scope
->outer
= current_scope
;
941 scope
->depth
= current_scope
? (current_scope
->depth
+ 1) : 0;
943 /* Check for scope depth overflow. Unlikely (2^28 == 268,435,456) but
945 if (current_scope
&& scope
->depth
== 0)
948 sorry ("GCC supports only %u nested scopes", scope
->depth
);
951 current_scope
= scope
;
952 keep_next_level_flag
= false;
956 /* This is called when we are leaving SCOPE. For each label defined
957 in SCOPE, add any appropriate decls to its decls_in_scope fields.
958 These are the decls whose initialization will be skipped by a goto
959 later in the function. */
962 update_label_decls (struct c_scope
*scope
)
969 if (s
->has_label_bindings
)
973 for (b
= s
->bindings
; b
!= NULL
; b
= b
->prev
)
975 struct c_label_vars
*label_vars
;
976 struct c_binding
*b1
;
978 struct c_goto_bindings
*g
;
980 if (TREE_CODE (b
->decl
) != LABEL_DECL
)
982 label_vars
= b
->u
.label
;
984 b1
= label_vars
->label_bindings
.bindings_in_scope
;
985 if (update_spot_bindings (scope
, &label_vars
->label_bindings
))
987 /* This label is defined in this scope. */
988 for (; b1
!= NULL
; b1
= b1
->prev
)
990 /* A goto from later in the function to this
991 label will never see the initialization of
992 B1, if any. Save it to issue a warning if
994 if (decl_jump_unsafe (b1
->decl
))
995 VEC_safe_push (tree
, gc
, label_vars
->decls_in_scope
,
1000 /* Update the bindings of any goto statements associated
1002 FOR_EACH_VEC_ELT (c_goto_bindings_p
, label_vars
->gotos
, ix
, g
)
1003 update_spot_bindings (scope
, &g
->goto_bindings
);
1007 /* Don't search beyond the current function. */
1008 if (s
== current_function_scope
)
1015 /* Set the TYPE_CONTEXT of all of TYPE's variants to CONTEXT. */
1018 set_type_context (tree type
, tree context
)
1020 for (type
= TYPE_MAIN_VARIANT (type
); type
;
1021 type
= TYPE_NEXT_VARIANT (type
))
1022 TYPE_CONTEXT (type
) = context
;
1025 /* Exit a scope. Restore the state of the identifier-decl mappings
1026 that were in effect when this scope was entered. Return a BLOCK
1027 node containing all the DECLs in this scope that are of interest
1028 to debug info generation. */
1033 struct c_scope
*scope
= current_scope
;
1034 tree block
, context
, p
;
1035 struct c_binding
*b
;
1037 bool functionbody
= scope
->function_body
;
1038 bool keep
= functionbody
|| scope
->keep
|| scope
->bindings
;
1040 update_label_decls (scope
);
1042 /* If appropriate, create a BLOCK to record the decls for the life
1043 of this function. */
1047 block
= make_node (BLOCK
);
1048 BLOCK_SUBBLOCKS (block
) = scope
->blocks
;
1049 TREE_USED (block
) = 1;
1051 /* In each subblock, record that this is its superior. */
1052 for (p
= scope
->blocks
; p
; p
= BLOCK_CHAIN (p
))
1053 BLOCK_SUPERCONTEXT (p
) = block
;
1055 BLOCK_VARS (block
) = 0;
1058 /* The TYPE_CONTEXTs for all of the tagged types belonging to this
1059 scope must be set so that they point to the appropriate
1060 construct, i.e. either to the current FUNCTION_DECL node, or
1061 else to the BLOCK node we just constructed.
1063 Note that for tagged types whose scope is just the formal
1064 parameter list for some function type specification, we can't
1065 properly set their TYPE_CONTEXTs here, because we don't have a
1066 pointer to the appropriate FUNCTION_TYPE node readily available
1067 to us. For those cases, the TYPE_CONTEXTs of the relevant tagged
1068 type nodes get set in `grokdeclarator' as soon as we have created
1069 the FUNCTION_TYPE node which will represent the "scope" for these
1070 "parameter list local" tagged types. */
1071 if (scope
->function_body
)
1072 context
= current_function_decl
;
1073 else if (scope
== file_scope
)
1075 tree file_decl
= build_decl (UNKNOWN_LOCATION
,
1076 TRANSLATION_UNIT_DECL
, 0, 0);
1077 DECL_CHAIN (file_decl
) = all_translation_units
;
1078 all_translation_units
= file_decl
;
1079 context
= file_decl
;
1084 /* Clear all bindings in this scope. */
1085 for (b
= scope
->bindings
; b
; b
= free_binding_and_advance (b
))
1088 switch (TREE_CODE (p
))
1091 /* Warnings for unused labels, errors for undefined labels. */
1092 if (TREE_USED (p
) && !DECL_INITIAL (p
))
1094 error ("label %q+D used but not defined", p
);
1095 DECL_INITIAL (p
) = error_mark_node
;
1098 warn_for_unused_label (p
);
1100 /* Labels go in BLOCK_VARS. */
1101 DECL_CHAIN (p
) = BLOCK_VARS (block
);
1102 BLOCK_VARS (block
) = p
;
1103 gcc_assert (I_LABEL_BINDING (b
->id
) == b
);
1104 I_LABEL_BINDING (b
->id
) = b
->shadowed
;
1106 /* Also pop back to the shadowed label_vars. */
1107 release_tree_vector (b
->u
.label
->decls_in_scope
);
1108 b
->u
.label
= b
->u
.label
->shadowed
;
1114 set_type_context (p
, context
);
1116 /* Types may not have tag-names, in which case the type
1117 appears in the bindings list with b->id NULL. */
1120 gcc_assert (I_TAG_BINDING (b
->id
) == b
);
1121 I_TAG_BINDING (b
->id
) = b
->shadowed
;
1126 /* Propagate TREE_ADDRESSABLE from nested functions to their
1127 containing functions. */
1128 if (!TREE_ASM_WRITTEN (p
)
1129 && DECL_INITIAL (p
) != 0
1130 && TREE_ADDRESSABLE (p
)
1131 && DECL_ABSTRACT_ORIGIN (p
) != 0
1132 && DECL_ABSTRACT_ORIGIN (p
) != p
)
1133 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (p
)) = 1;
1134 if (!DECL_EXTERNAL (p
)
1135 && !DECL_INITIAL (p
)
1136 && scope
!= file_scope
1137 && scope
!= external_scope
)
1139 error ("nested function %q+D declared but never defined", p
);
1140 undef_nested_function
= true;
1142 else if (DECL_DECLARED_INLINE_P (p
)
1144 && !DECL_INITIAL (p
))
1146 /* C99 6.7.4p6: "a function with external linkage... declared
1147 with an inline function specifier ... shall also be defined
1148 in the same translation unit." */
1149 if (!flag_gnu89_inline
)
1150 pedwarn (input_location
, 0,
1151 "inline function %q+D declared but never defined", p
);
1152 DECL_EXTERNAL (p
) = 1;
1158 /* Warnings for unused variables. */
1159 if ((!TREE_USED (p
) || !DECL_READ_P (p
))
1160 && !TREE_NO_WARNING (p
)
1161 && !DECL_IN_SYSTEM_HEADER (p
)
1163 && !DECL_ARTIFICIAL (p
)
1164 && scope
!= file_scope
1165 && scope
!= external_scope
)
1168 warning (OPT_Wunused_variable
, "unused variable %q+D", p
);
1169 else if (DECL_CONTEXT (p
) == current_function_decl
)
1170 warning_at (DECL_SOURCE_LOCATION (p
),
1171 OPT_Wunused_but_set_variable
,
1172 "variable %qD set but not used", p
);
1177 error ("type of array %q+D completed incompatibly with"
1178 " implicit initialization", p
);
1185 /* All of these go in BLOCK_VARS, but only if this is the
1186 binding in the home scope. */
1189 DECL_CHAIN (p
) = BLOCK_VARS (block
);
1190 BLOCK_VARS (block
) = p
;
1192 else if (VAR_OR_FUNCTION_DECL_P (p
))
1194 /* For block local externs add a special
1195 DECL_EXTERNAL decl for debug info generation. */
1196 tree extp
= copy_node (p
);
1198 DECL_EXTERNAL (extp
) = 1;
1199 TREE_STATIC (extp
) = 0;
1200 TREE_PUBLIC (extp
) = 1;
1201 DECL_INITIAL (extp
) = NULL_TREE
;
1202 DECL_LANG_SPECIFIC (extp
) = NULL
;
1203 DECL_CONTEXT (extp
) = current_function_decl
;
1204 if (TREE_CODE (p
) == FUNCTION_DECL
)
1206 DECL_RESULT (extp
) = NULL_TREE
;
1207 DECL_SAVED_TREE (extp
) = NULL_TREE
;
1208 DECL_STRUCT_FUNCTION (extp
) = NULL
;
1210 if (b
->locus
!= UNKNOWN_LOCATION
)
1211 DECL_SOURCE_LOCATION (extp
) = b
->locus
;
1212 DECL_CHAIN (extp
) = BLOCK_VARS (block
);
1213 BLOCK_VARS (block
) = extp
;
1215 /* If this is the file scope, and we are processing more
1216 than one translation unit in this compilation, set
1217 DECL_CONTEXT of each decl to the TRANSLATION_UNIT_DECL.
1218 This makes same_translation_unit_p work, and causes
1219 static declarations to be given disambiguating suffixes. */
1220 if (scope
== file_scope
&& num_in_fnames
> 1)
1222 DECL_CONTEXT (p
) = context
;
1223 if (TREE_CODE (p
) == TYPE_DECL
)
1224 set_type_context (TREE_TYPE (p
), context
);
1228 /* Parameters go in DECL_ARGUMENTS, not BLOCK_VARS, and have
1229 already been put there by store_parm_decls. Unused-
1230 parameter warnings are handled by function.c.
1231 error_mark_node obviously does not go in BLOCK_VARS and
1232 does not get unused-variable warnings. */
1235 /* It is possible for a decl not to have a name. We get
1236 here with b->id NULL in this case. */
1239 gcc_assert (I_SYMBOL_BINDING (b
->id
) == b
);
1240 I_SYMBOL_BINDING (b
->id
) = b
->shadowed
;
1241 if (b
->shadowed
&& b
->shadowed
->u
.type
)
1242 TREE_TYPE (b
->shadowed
->decl
) = b
->shadowed
->u
.type
;
1252 /* Dispose of the block that we just made inside some higher level. */
1253 if ((scope
->function_body
|| scope
== file_scope
) && context
)
1255 DECL_INITIAL (context
) = block
;
1256 BLOCK_SUPERCONTEXT (block
) = context
;
1258 else if (scope
->outer
)
1261 SCOPE_LIST_APPEND (scope
->outer
, blocks
, block
);
1262 /* If we did not make a block for the scope just exited, any
1263 blocks made for inner scopes must be carried forward so they
1264 will later become subblocks of something else. */
1265 else if (scope
->blocks
)
1266 SCOPE_LIST_CONCAT (scope
->outer
, blocks
, scope
, blocks
);
1269 /* Pop the current scope, and free the structure for reuse. */
1270 current_scope
= scope
->outer
;
1271 if (scope
->function_body
)
1272 current_function_scope
= scope
->outer_function
;
1274 memset (scope
, 0, sizeof (struct c_scope
));
1275 scope
->outer
= scope_freelist
;
1276 scope_freelist
= scope
;
1282 push_file_scope (void)
1290 file_scope
= current_scope
;
1292 start_fname_decls ();
1294 for (decl
= visible_builtins
; decl
; decl
= DECL_CHAIN (decl
))
1295 bind (DECL_NAME (decl
), decl
, file_scope
,
1296 /*invisible=*/false, /*nested=*/true, DECL_SOURCE_LOCATION (decl
));
1300 pop_file_scope (void)
1302 /* In case there were missing closebraces, get us back to the global
1304 while (current_scope
!= file_scope
)
1307 /* __FUNCTION__ is defined at file scope (""). This
1308 call may not be necessary as my tests indicate it
1309 still works without it. */
1310 finish_fname_decls ();
1312 check_inline_statics ();
1314 /* This is the point to write out a PCH if we're doing that.
1315 In that case we do not want to do anything else. */
1318 c_common_write_pch ();
1322 /* Pop off the file scope and close this translation unit. */
1326 maybe_apply_pending_pragma_weaks ();
1329 /* Adjust the bindings for the start of a statement expression. */
1332 c_bindings_start_stmt_expr (struct c_spot_bindings
* switch_bindings
)
1334 struct c_scope
*scope
;
1336 for (scope
= current_scope
; scope
!= NULL
; scope
= scope
->outer
)
1338 struct c_binding
*b
;
1340 if (!scope
->has_label_bindings
)
1343 for (b
= scope
->bindings
; b
!= NULL
; b
= b
->prev
)
1345 struct c_label_vars
*label_vars
;
1347 struct c_goto_bindings
*g
;
1349 if (TREE_CODE (b
->decl
) != LABEL_DECL
)
1351 label_vars
= b
->u
.label
;
1352 ++label_vars
->label_bindings
.stmt_exprs
;
1353 FOR_EACH_VEC_ELT (c_goto_bindings_p
, label_vars
->gotos
, ix
, g
)
1354 ++g
->goto_bindings
.stmt_exprs
;
1358 if (switch_bindings
!= NULL
)
1359 ++switch_bindings
->stmt_exprs
;
1362 /* Adjust the bindings for the end of a statement expression. */
1365 c_bindings_end_stmt_expr (struct c_spot_bindings
*switch_bindings
)
1367 struct c_scope
*scope
;
1369 for (scope
= current_scope
; scope
!= NULL
; scope
= scope
->outer
)
1371 struct c_binding
*b
;
1373 if (!scope
->has_label_bindings
)
1376 for (b
= scope
->bindings
; b
!= NULL
; b
= b
->prev
)
1378 struct c_label_vars
*label_vars
;
1380 struct c_goto_bindings
*g
;
1382 if (TREE_CODE (b
->decl
) != LABEL_DECL
)
1384 label_vars
= b
->u
.label
;
1385 --label_vars
->label_bindings
.stmt_exprs
;
1386 if (label_vars
->label_bindings
.stmt_exprs
< 0)
1388 label_vars
->label_bindings
.left_stmt_expr
= true;
1389 label_vars
->label_bindings
.stmt_exprs
= 0;
1391 FOR_EACH_VEC_ELT (c_goto_bindings_p
, label_vars
->gotos
, ix
, g
)
1393 --g
->goto_bindings
.stmt_exprs
;
1394 if (g
->goto_bindings
.stmt_exprs
< 0)
1396 g
->goto_bindings
.left_stmt_expr
= true;
1397 g
->goto_bindings
.stmt_exprs
= 0;
1403 if (switch_bindings
!= NULL
)
1405 --switch_bindings
->stmt_exprs
;
1406 gcc_assert (switch_bindings
->stmt_exprs
>= 0);
1410 /* Push a definition or a declaration of struct, union or enum tag "name".
1411 "type" should be the type node.
1412 We assume that the tag "name" is not already defined, and has a location
1415 Note that the definition may really be just a forward reference.
1416 In that case, the TYPE_SIZE will be zero. */
1419 pushtag (location_t loc
, tree name
, tree type
)
1421 /* Record the identifier as the type's name if it has none. */
1422 if (name
&& !TYPE_NAME (type
))
1423 TYPE_NAME (type
) = name
;
1424 bind (name
, type
, current_scope
, /*invisible=*/false, /*nested=*/false, loc
);
1426 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1427 tagged type we just added to the current scope. This fake
1428 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1429 to output a representation of a tagged type, and it also gives
1430 us a convenient place to record the "scope start" address for the
1433 TYPE_STUB_DECL (type
) = pushdecl (build_decl (loc
,
1434 TYPE_DECL
, NULL_TREE
, type
));
1436 /* An approximation for now, so we can tell this is a function-scope tag.
1437 This will be updated in pop_scope. */
1438 TYPE_CONTEXT (type
) = DECL_CONTEXT (TYPE_STUB_DECL (type
));
1440 if (warn_cxx_compat
&& name
!= NULL_TREE
)
1442 struct c_binding
*b
= I_SYMBOL_BINDING (name
);
1445 && b
->decl
!= NULL_TREE
1446 && TREE_CODE (b
->decl
) == TYPE_DECL
1447 && (B_IN_CURRENT_SCOPE (b
)
1448 || (current_scope
== file_scope
&& B_IN_EXTERNAL_SCOPE (b
)))
1449 && (TYPE_MAIN_VARIANT (TREE_TYPE (b
->decl
))
1450 != TYPE_MAIN_VARIANT (type
)))
1452 warning_at (loc
, OPT_Wc___compat
,
1453 ("using %qD as both a typedef and a tag is "
1456 if (b
->locus
!= UNKNOWN_LOCATION
)
1457 inform (b
->locus
, "originally defined here");
1462 /* Subroutine of compare_decls. Allow harmless mismatches in return
1463 and argument types provided that the type modes match. This function
1464 return a unified type given a suitable match, and 0 otherwise. */
1467 match_builtin_function_types (tree newtype
, tree oldtype
)
1469 tree newrettype
, oldrettype
;
1470 tree newargs
, oldargs
;
1471 tree trytype
, tryargs
;
1473 /* Accept the return type of the new declaration if same modes. */
1474 oldrettype
= TREE_TYPE (oldtype
);
1475 newrettype
= TREE_TYPE (newtype
);
1477 if (TYPE_MODE (oldrettype
) != TYPE_MODE (newrettype
))
1480 oldargs
= TYPE_ARG_TYPES (oldtype
);
1481 newargs
= TYPE_ARG_TYPES (newtype
);
1484 while (oldargs
|| newargs
)
1488 || !TREE_VALUE (oldargs
)
1489 || !TREE_VALUE (newargs
)
1490 || TYPE_MODE (TREE_VALUE (oldargs
))
1491 != TYPE_MODE (TREE_VALUE (newargs
)))
1494 oldargs
= TREE_CHAIN (oldargs
);
1495 newargs
= TREE_CHAIN (newargs
);
1498 trytype
= build_function_type (newrettype
, tryargs
);
1499 return build_type_attribute_variant (trytype
, TYPE_ATTRIBUTES (oldtype
));
1502 /* Subroutine of diagnose_mismatched_decls. Check for function type
1503 mismatch involving an empty arglist vs a nonempty one and give clearer
1506 diagnose_arglist_conflict (tree newdecl
, tree olddecl
,
1507 tree newtype
, tree oldtype
)
1511 if (TREE_CODE (olddecl
) != FUNCTION_DECL
1512 || !comptypes (TREE_TYPE (oldtype
), TREE_TYPE (newtype
))
1513 || !((TYPE_ARG_TYPES (oldtype
) == 0 && DECL_INITIAL (olddecl
) == 0)
1515 (TYPE_ARG_TYPES (newtype
) == 0 && DECL_INITIAL (newdecl
) == 0)))
1518 t
= TYPE_ARG_TYPES (oldtype
);
1520 t
= TYPE_ARG_TYPES (newtype
);
1521 for (; t
; t
= TREE_CHAIN (t
))
1523 tree type
= TREE_VALUE (t
);
1525 if (TREE_CHAIN (t
) == 0
1526 && TYPE_MAIN_VARIANT (type
) != void_type_node
)
1528 inform (input_location
, "a parameter list with an ellipsis can%'t match "
1529 "an empty parameter name list declaration");
1533 if (c_type_promotes_to (type
) != type
)
1535 inform (input_location
, "an argument type that has a default promotion can%'t match "
1536 "an empty parameter name list declaration");
1542 /* Another subroutine of diagnose_mismatched_decls. OLDDECL is an
1543 old-style function definition, NEWDECL is a prototype declaration.
1544 Diagnose inconsistencies in the argument list. Returns TRUE if
1545 the prototype is compatible, FALSE if not. */
1547 validate_proto_after_old_defn (tree newdecl
, tree newtype
, tree oldtype
)
1549 tree newargs
, oldargs
;
1552 #define END_OF_ARGLIST(t) ((t) == void_type_node)
1554 oldargs
= TYPE_ACTUAL_ARG_TYPES (oldtype
);
1555 newargs
= TYPE_ARG_TYPES (newtype
);
1560 tree oldargtype
= TREE_VALUE (oldargs
);
1561 tree newargtype
= TREE_VALUE (newargs
);
1563 if (oldargtype
== error_mark_node
|| newargtype
== error_mark_node
)
1566 oldargtype
= TYPE_MAIN_VARIANT (oldargtype
);
1567 newargtype
= TYPE_MAIN_VARIANT (newargtype
);
1569 if (END_OF_ARGLIST (oldargtype
) && END_OF_ARGLIST (newargtype
))
1572 /* Reaching the end of just one list means the two decls don't
1573 agree on the number of arguments. */
1574 if (END_OF_ARGLIST (oldargtype
))
1576 error ("prototype for %q+D declares more arguments "
1577 "than previous old-style definition", newdecl
);
1580 else if (END_OF_ARGLIST (newargtype
))
1582 error ("prototype for %q+D declares fewer arguments "
1583 "than previous old-style definition", newdecl
);
1587 /* Type for passing arg must be consistent with that declared
1589 else if (!comptypes (oldargtype
, newargtype
))
1591 error ("prototype for %q+D declares argument %d"
1592 " with incompatible type",
1597 oldargs
= TREE_CHAIN (oldargs
);
1598 newargs
= TREE_CHAIN (newargs
);
1602 /* If we get here, no errors were found, but do issue a warning
1603 for this poor-style construct. */
1604 warning (0, "prototype for %q+D follows non-prototype definition",
1607 #undef END_OF_ARGLIST
1610 /* Subroutine of diagnose_mismatched_decls. Report the location of DECL,
1611 first in a pair of mismatched declarations, using the diagnostic
1614 locate_old_decl (tree decl
)
1616 if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_BUILT_IN (decl
))
1618 else if (DECL_INITIAL (decl
))
1619 inform (input_location
, "previous definition of %q+D was here", decl
);
1620 else if (C_DECL_IMPLICIT (decl
))
1621 inform (input_location
, "previous implicit declaration of %q+D was here", decl
);
1623 inform (input_location
, "previous declaration of %q+D was here", decl
);
1626 /* Subroutine of duplicate_decls. Compare NEWDECL to OLDDECL.
1627 Returns true if the caller should proceed to merge the two, false
1628 if OLDDECL should simply be discarded. As a side effect, issues
1629 all necessary diagnostics for invalid or poor-style combinations.
1630 If it returns true, writes the types of NEWDECL and OLDDECL to
1631 *NEWTYPEP and *OLDTYPEP - these may have been adjusted from
1632 TREE_TYPE (NEWDECL, OLDDECL) respectively. */
1635 diagnose_mismatched_decls (tree newdecl
, tree olddecl
,
1636 tree
*newtypep
, tree
*oldtypep
)
1638 tree newtype
, oldtype
;
1639 bool pedwarned
= false;
1640 bool warned
= false;
1643 #define DECL_EXTERN_INLINE(DECL) (DECL_DECLARED_INLINE_P (DECL) \
1644 && DECL_EXTERNAL (DECL))
1646 /* If we have error_mark_node for either decl or type, just discard
1647 the previous decl - we're in an error cascade already. */
1648 if (olddecl
== error_mark_node
|| newdecl
== error_mark_node
)
1650 *oldtypep
= oldtype
= TREE_TYPE (olddecl
);
1651 *newtypep
= newtype
= TREE_TYPE (newdecl
);
1652 if (oldtype
== error_mark_node
|| newtype
== error_mark_node
)
1655 /* Two different categories of symbol altogether. This is an error
1656 unless OLDDECL is a builtin. OLDDECL will be discarded in any case. */
1657 if (TREE_CODE (olddecl
) != TREE_CODE (newdecl
))
1659 if (!(TREE_CODE (olddecl
) == FUNCTION_DECL
1660 && DECL_BUILT_IN (olddecl
)
1661 && !C_DECL_DECLARED_BUILTIN (olddecl
)))
1663 error ("%q+D redeclared as different kind of symbol", newdecl
);
1664 locate_old_decl (olddecl
);
1666 else if (TREE_PUBLIC (newdecl
))
1667 warning (0, "built-in function %q+D declared as non-function",
1670 warning (OPT_Wshadow
, "declaration of %q+D shadows "
1671 "a built-in function", newdecl
);
1675 /* Enumerators have no linkage, so may only be declared once in a
1677 if (TREE_CODE (olddecl
) == CONST_DECL
)
1679 error ("redeclaration of enumerator %q+D", newdecl
);
1680 locate_old_decl (olddecl
);
1684 if (!comptypes (oldtype
, newtype
))
1686 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1687 && DECL_BUILT_IN (olddecl
) && !C_DECL_DECLARED_BUILTIN (olddecl
))
1689 /* Accept harmless mismatch in function types.
1690 This is for the ffs and fprintf builtins. */
1691 tree trytype
= match_builtin_function_types (newtype
, oldtype
);
1693 if (trytype
&& comptypes (newtype
, trytype
))
1694 *oldtypep
= oldtype
= trytype
;
1697 /* If types don't match for a built-in, throw away the
1698 built-in. No point in calling locate_old_decl here, it
1699 won't print anything. */
1700 warning (0, "conflicting types for built-in function %q+D",
1705 else if (TREE_CODE (olddecl
) == FUNCTION_DECL
1706 && DECL_IS_BUILTIN (olddecl
))
1708 /* A conflicting function declaration for a predeclared
1709 function that isn't actually built in. Objective C uses
1710 these. The new declaration silently overrides everything
1711 but the volatility (i.e. noreturn) indication. See also
1712 below. FIXME: Make Objective C use normal builtins. */
1713 TREE_THIS_VOLATILE (newdecl
) |= TREE_THIS_VOLATILE (olddecl
);
1716 /* Permit void foo (...) to match int foo (...) if the latter is
1717 the definition and implicit int was used. See
1718 c-torture/compile/920625-2.c. */
1719 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
&& DECL_INITIAL (newdecl
)
1720 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype
)) == void_type_node
1721 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype
)) == integer_type_node
1722 && C_FUNCTION_IMPLICIT_INT (newdecl
) && !DECL_INITIAL (olddecl
))
1724 pedwarned
= pedwarn (input_location
, 0,
1725 "conflicting types for %q+D", newdecl
);
1726 /* Make sure we keep void as the return type. */
1727 TREE_TYPE (newdecl
) = *newtypep
= newtype
= oldtype
;
1728 C_FUNCTION_IMPLICIT_INT (newdecl
) = 0;
1730 /* Permit void foo (...) to match an earlier call to foo (...) with
1731 no declared type (thus, implicitly int). */
1732 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
1733 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype
)) == void_type_node
1734 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype
)) == integer_type_node
1735 && C_DECL_IMPLICIT (olddecl
) && !DECL_INITIAL (olddecl
))
1737 pedwarned
= pedwarn (input_location
, 0,
1738 "conflicting types for %q+D", newdecl
);
1739 /* Make sure we keep void as the return type. */
1740 TREE_TYPE (olddecl
) = *oldtypep
= oldtype
= newtype
;
1744 int new_quals
= TYPE_QUALS (newtype
);
1745 int old_quals
= TYPE_QUALS (oldtype
);
1747 if (new_quals
!= old_quals
)
1749 addr_space_t new_addr
= DECODE_QUAL_ADDR_SPACE (new_quals
);
1750 addr_space_t old_addr
= DECODE_QUAL_ADDR_SPACE (old_quals
);
1751 if (new_addr
!= old_addr
)
1753 if (ADDR_SPACE_GENERIC_P (new_addr
))
1754 error ("conflicting named address spaces (generic vs %s) "
1756 c_addr_space_name (old_addr
), newdecl
);
1757 else if (ADDR_SPACE_GENERIC_P (old_addr
))
1758 error ("conflicting named address spaces (%s vs generic) "
1760 c_addr_space_name (new_addr
), newdecl
);
1762 error ("conflicting named address spaces (%s vs %s) "
1764 c_addr_space_name (new_addr
),
1765 c_addr_space_name (old_addr
),
1769 if (CLEAR_QUAL_ADDR_SPACE (new_quals
)
1770 != CLEAR_QUAL_ADDR_SPACE (old_quals
))
1771 error ("conflicting type qualifiers for %q+D", newdecl
);
1774 error ("conflicting types for %q+D", newdecl
);
1775 diagnose_arglist_conflict (newdecl
, olddecl
, newtype
, oldtype
);
1776 locate_old_decl (olddecl
);
1781 /* Redeclaration of a type is a constraint violation (6.7.2.3p1),
1782 but silently ignore the redeclaration if either is in a system
1783 header. (Conflicting redeclarations were handled above.) This
1784 is allowed for C1X if the types are the same, not just
1786 if (TREE_CODE (newdecl
) == TYPE_DECL
)
1788 bool types_different
= false;
1789 int comptypes_result
;
1792 = comptypes_check_different_types (oldtype
, newtype
, &types_different
);
1794 if (comptypes_result
!= 1 || types_different
)
1796 error ("redefinition of typedef %q+D with different type", newdecl
);
1797 locate_old_decl (olddecl
);
1801 if (DECL_IN_SYSTEM_HEADER (newdecl
)
1802 || DECL_IN_SYSTEM_HEADER (olddecl
)
1803 || TREE_NO_WARNING (newdecl
)
1804 || TREE_NO_WARNING (olddecl
))
1805 return true; /* Allow OLDDECL to continue in use. */
1807 if (pedantic
&& !flag_isoc1x
)
1809 pedwarn (input_location
, OPT_pedantic
,
1810 "redefinition of typedef %q+D", newdecl
);
1811 locate_old_decl (olddecl
);
1813 else if (variably_modified_type_p (newtype
, NULL
))
1815 /* Whether there is a constraint violation for the types not
1816 being the same cannot be determined at compile time; a
1817 warning that there may be one at runtime is considered
1818 appropriate (WG14 reflector message 11743, 8 May 2009). */
1819 warning (0, "redefinition of typedef %q+D may be a constraint "
1820 "violation at runtime", newdecl
);
1821 locate_old_decl (olddecl
);
1827 /* Function declarations can either be 'static' or 'extern' (no
1828 qualifier is equivalent to 'extern' - C99 6.2.2p5) and therefore
1829 can never conflict with each other on account of linkage
1830 (6.2.2p4). Multiple definitions are not allowed (6.9p3,5) but
1831 gnu89 mode permits two definitions if one is 'extern inline' and
1832 one is not. The non- extern-inline definition supersedes the
1833 extern-inline definition. */
1835 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1837 /* If you declare a built-in function name as static, or
1838 define the built-in with an old-style definition (so we
1839 can't validate the argument list) the built-in definition is
1840 overridden, but optionally warn this was a bad choice of name. */
1841 if (DECL_BUILT_IN (olddecl
)
1842 && !C_DECL_DECLARED_BUILTIN (olddecl
)
1843 && (!TREE_PUBLIC (newdecl
)
1844 || (DECL_INITIAL (newdecl
)
1845 && !TYPE_ARG_TYPES (TREE_TYPE (newdecl
)))))
1847 warning (OPT_Wshadow
, "declaration of %q+D shadows "
1848 "a built-in function", newdecl
);
1849 /* Discard the old built-in function. */
1853 if (DECL_INITIAL (newdecl
))
1855 if (DECL_INITIAL (olddecl
))
1857 /* If both decls are in the same TU and the new declaration
1858 isn't overriding an extern inline reject the new decl.
1859 In c99, no overriding is allowed in the same translation
1861 if ((!DECL_EXTERN_INLINE (olddecl
)
1862 || DECL_EXTERN_INLINE (newdecl
)
1863 || (!flag_gnu89_inline
1864 && (!DECL_DECLARED_INLINE_P (olddecl
)
1865 || !lookup_attribute ("gnu_inline",
1866 DECL_ATTRIBUTES (olddecl
)))
1867 && (!DECL_DECLARED_INLINE_P (newdecl
)
1868 || !lookup_attribute ("gnu_inline",
1869 DECL_ATTRIBUTES (newdecl
))))
1871 && same_translation_unit_p (newdecl
, olddecl
))
1873 error ("redefinition of %q+D", newdecl
);
1874 locate_old_decl (olddecl
);
1879 /* If we have a prototype after an old-style function definition,
1880 the argument types must be checked specially. */
1881 else if (DECL_INITIAL (olddecl
)
1882 && !TYPE_ARG_TYPES (oldtype
) && TYPE_ARG_TYPES (newtype
)
1883 && TYPE_ACTUAL_ARG_TYPES (oldtype
)
1884 && !validate_proto_after_old_defn (newdecl
, newtype
, oldtype
))
1886 locate_old_decl (olddecl
);
1889 /* A non-static declaration (even an "extern") followed by a
1890 static declaration is undefined behavior per C99 6.2.2p3-5,7.
1891 The same is true for a static forward declaration at block
1892 scope followed by a non-static declaration/definition at file
1893 scope. Static followed by non-static at the same scope is
1894 not undefined behavior, and is the most convenient way to get
1895 some effects (see e.g. what unwind-dw2-fde-glibc.c does to
1896 the definition of _Unwind_Find_FDE in unwind-dw2-fde.c), but
1897 we do diagnose it if -Wtraditional. */
1898 if (TREE_PUBLIC (olddecl
) && !TREE_PUBLIC (newdecl
))
1900 /* Two exceptions to the rule. If olddecl is an extern
1901 inline, or a predeclared function that isn't actually
1902 built in, newdecl silently overrides olddecl. The latter
1903 occur only in Objective C; see also above. (FIXME: Make
1904 Objective C use normal builtins.) */
1905 if (!DECL_IS_BUILTIN (olddecl
)
1906 && !DECL_EXTERN_INLINE (olddecl
))
1908 error ("static declaration of %q+D follows "
1909 "non-static declaration", newdecl
);
1910 locate_old_decl (olddecl
);
1914 else if (TREE_PUBLIC (newdecl
) && !TREE_PUBLIC (olddecl
))
1916 if (DECL_CONTEXT (olddecl
))
1918 error ("non-static declaration of %q+D follows "
1919 "static declaration", newdecl
);
1920 locate_old_decl (olddecl
);
1923 else if (warn_traditional
)
1925 warned
|= warning (OPT_Wtraditional
,
1926 "non-static declaration of %q+D "
1927 "follows static declaration", newdecl
);
1931 /* Make sure gnu_inline attribute is either not present, or
1932 present on all inline decls. */
1933 if (DECL_DECLARED_INLINE_P (olddecl
)
1934 && DECL_DECLARED_INLINE_P (newdecl
))
1936 bool newa
= lookup_attribute ("gnu_inline",
1937 DECL_ATTRIBUTES (newdecl
)) != NULL
;
1938 bool olda
= lookup_attribute ("gnu_inline",
1939 DECL_ATTRIBUTES (olddecl
)) != NULL
;
1942 error_at (input_location
, "%<gnu_inline%> attribute present on %q+D",
1943 newa
? newdecl
: olddecl
);
1944 error_at (DECL_SOURCE_LOCATION (newa
? olddecl
: newdecl
),
1949 else if (TREE_CODE (newdecl
) == VAR_DECL
)
1951 /* Only variables can be thread-local, and all declarations must
1952 agree on this property. */
1953 if (C_DECL_THREADPRIVATE_P (olddecl
) && !DECL_THREAD_LOCAL_P (newdecl
))
1955 /* Nothing to check. Since OLDDECL is marked threadprivate
1956 and NEWDECL does not have a thread-local attribute, we
1957 will merge the threadprivate attribute into NEWDECL. */
1960 else if (DECL_THREAD_LOCAL_P (newdecl
) != DECL_THREAD_LOCAL_P (olddecl
))
1962 if (DECL_THREAD_LOCAL_P (newdecl
))
1963 error ("thread-local declaration of %q+D follows "
1964 "non-thread-local declaration", newdecl
);
1966 error ("non-thread-local declaration of %q+D follows "
1967 "thread-local declaration", newdecl
);
1969 locate_old_decl (olddecl
);
1973 /* Multiple initialized definitions are not allowed (6.9p3,5). */
1974 if (DECL_INITIAL (newdecl
) && DECL_INITIAL (olddecl
))
1976 error ("redefinition of %q+D", newdecl
);
1977 locate_old_decl (olddecl
);
1981 /* Objects declared at file scope: if the first declaration had
1982 external linkage (even if it was an external reference) the
1983 second must have external linkage as well, or the behavior is
1984 undefined. If the first declaration had internal linkage, then
1985 the second must too, or else be an external reference (in which
1986 case the composite declaration still has internal linkage).
1987 As for function declarations, we warn about the static-then-
1988 extern case only for -Wtraditional. See generally 6.2.2p3-5,7. */
1989 if (DECL_FILE_SCOPE_P (newdecl
)
1990 && TREE_PUBLIC (newdecl
) != TREE_PUBLIC (olddecl
))
1992 if (DECL_EXTERNAL (newdecl
))
1994 if (!DECL_FILE_SCOPE_P (olddecl
))
1996 error ("extern declaration of %q+D follows "
1997 "declaration with no linkage", newdecl
);
1998 locate_old_decl (olddecl
);
2001 else if (warn_traditional
)
2003 warned
|= warning (OPT_Wtraditional
,
2004 "non-static declaration of %q+D "
2005 "follows static declaration", newdecl
);
2010 if (TREE_PUBLIC (newdecl
))
2011 error ("non-static declaration of %q+D follows "
2012 "static declaration", newdecl
);
2014 error ("static declaration of %q+D follows "
2015 "non-static declaration", newdecl
);
2017 locate_old_decl (olddecl
);
2021 /* Two objects with the same name declared at the same block
2022 scope must both be external references (6.7p3). */
2023 else if (!DECL_FILE_SCOPE_P (newdecl
))
2025 if (DECL_EXTERNAL (newdecl
))
2027 /* Extern with initializer at block scope, which will
2028 already have received an error. */
2030 else if (DECL_EXTERNAL (olddecl
))
2032 error ("declaration of %q+D with no linkage follows "
2033 "extern declaration", newdecl
);
2034 locate_old_decl (olddecl
);
2038 error ("redeclaration of %q+D with no linkage", newdecl
);
2039 locate_old_decl (olddecl
);
2045 /* C++ does not permit a decl to appear multiple times at file
2048 && DECL_FILE_SCOPE_P (newdecl
)
2049 && !DECL_EXTERNAL (newdecl
)
2050 && !DECL_EXTERNAL (olddecl
))
2051 warned
|= warning_at (DECL_SOURCE_LOCATION (newdecl
),
2053 ("duplicate declaration of %qD is "
2059 /* All decls must agree on a visibility. */
2060 if (CODE_CONTAINS_STRUCT (TREE_CODE (newdecl
), TS_DECL_WITH_VIS
)
2061 && DECL_VISIBILITY_SPECIFIED (newdecl
) && DECL_VISIBILITY_SPECIFIED (olddecl
)
2062 && DECL_VISIBILITY (newdecl
) != DECL_VISIBILITY (olddecl
))
2064 warned
|= warning (0, "redeclaration of %q+D with different visibility "
2065 "(old visibility preserved)", newdecl
);
2068 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2070 /* Diagnose inline __attribute__ ((noinline)) which is silly. */
2071 if (DECL_DECLARED_INLINE_P (newdecl
)
2072 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl
)))
2074 warned
|= warning (OPT_Wattributes
,
2075 "inline declaration of %qD follows "
2076 "declaration with attribute noinline", newdecl
);
2078 else if (DECL_DECLARED_INLINE_P (olddecl
)
2079 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl
)))
2081 warned
|= warning (OPT_Wattributes
,
2082 "declaration of %q+D with attribute "
2083 "noinline follows inline declaration ", newdecl
);
2086 else /* PARM_DECL, VAR_DECL */
2088 /* Redeclaration of a parameter is a constraint violation (this is
2089 not explicitly stated, but follows from C99 6.7p3 [no more than
2090 one declaration of the same identifier with no linkage in the
2091 same scope, except type tags] and 6.2.2p6 [parameters have no
2092 linkage]). We must check for a forward parameter declaration,
2093 indicated by TREE_ASM_WRITTEN on the old declaration - this is
2094 an extension, the mandatory diagnostic for which is handled by
2095 mark_forward_parm_decls. */
2097 if (TREE_CODE (newdecl
) == PARM_DECL
2098 && (!TREE_ASM_WRITTEN (olddecl
) || TREE_ASM_WRITTEN (newdecl
)))
2100 error ("redefinition of parameter %q+D", newdecl
);
2101 locate_old_decl (olddecl
);
2106 /* Optional warning for completely redundant decls. */
2107 if (!warned
&& !pedwarned
2108 && warn_redundant_decls
2109 /* Don't warn about a function declaration followed by a
2111 && !(TREE_CODE (newdecl
) == FUNCTION_DECL
2112 && DECL_INITIAL (newdecl
) && !DECL_INITIAL (olddecl
))
2113 /* Don't warn about redundant redeclarations of builtins. */
2114 && !(TREE_CODE (newdecl
) == FUNCTION_DECL
2115 && !DECL_BUILT_IN (newdecl
)
2116 && DECL_BUILT_IN (olddecl
)
2117 && !C_DECL_DECLARED_BUILTIN (olddecl
))
2118 /* Don't warn about an extern followed by a definition. */
2119 && !(DECL_EXTERNAL (olddecl
) && !DECL_EXTERNAL (newdecl
))
2120 /* Don't warn about forward parameter decls. */
2121 && !(TREE_CODE (newdecl
) == PARM_DECL
2122 && TREE_ASM_WRITTEN (olddecl
) && !TREE_ASM_WRITTEN (newdecl
))
2123 /* Don't warn about a variable definition following a declaration. */
2124 && !(TREE_CODE (newdecl
) == VAR_DECL
2125 && DECL_INITIAL (newdecl
) && !DECL_INITIAL (olddecl
)))
2127 warned
= warning (OPT_Wredundant_decls
, "redundant redeclaration of %q+D",
2131 /* Report location of previous decl/defn. */
2132 if (warned
|| pedwarned
)
2133 locate_old_decl (olddecl
);
2135 #undef DECL_EXTERN_INLINE
2140 /* Subroutine of duplicate_decls. NEWDECL has been found to be
2141 consistent with OLDDECL, but carries new information. Merge the
2142 new information into OLDDECL. This function issues no
2146 merge_decls (tree newdecl
, tree olddecl
, tree newtype
, tree oldtype
)
2148 bool new_is_definition
= (TREE_CODE (newdecl
) == FUNCTION_DECL
2149 && DECL_INITIAL (newdecl
) != 0);
2150 bool new_is_prototype
= (TREE_CODE (newdecl
) == FUNCTION_DECL
2151 && TYPE_ARG_TYPES (TREE_TYPE (newdecl
)) != 0);
2152 bool old_is_prototype
= (TREE_CODE (olddecl
) == FUNCTION_DECL
2153 && TYPE_ARG_TYPES (TREE_TYPE (olddecl
)) != 0);
2154 bool extern_changed
= false;
2156 /* For real parm decl following a forward decl, rechain the old decl
2157 in its new location and clear TREE_ASM_WRITTEN (it's not a
2158 forward decl anymore). */
2159 if (TREE_CODE (newdecl
) == PARM_DECL
2160 && TREE_ASM_WRITTEN (olddecl
) && !TREE_ASM_WRITTEN (newdecl
))
2162 struct c_binding
*b
, **here
;
2164 for (here
= ¤t_scope
->bindings
; *here
; here
= &(*here
)->prev
)
2165 if ((*here
)->decl
== olddecl
)
2172 b
->prev
= current_scope
->bindings
;
2173 current_scope
->bindings
= b
;
2175 TREE_ASM_WRITTEN (olddecl
) = 0;
2178 DECL_ATTRIBUTES (newdecl
)
2179 = targetm
.merge_decl_attributes (olddecl
, newdecl
);
2181 /* Merge the data types specified in the two decls. */
2183 = TREE_TYPE (olddecl
)
2184 = composite_type (newtype
, oldtype
);
2186 /* Lay the type out, unless already done. */
2187 if (!comptypes (oldtype
, TREE_TYPE (newdecl
)))
2189 if (TREE_TYPE (newdecl
) != error_mark_node
)
2190 layout_type (TREE_TYPE (newdecl
));
2191 if (TREE_CODE (newdecl
) != FUNCTION_DECL
2192 && TREE_CODE (newdecl
) != TYPE_DECL
2193 && TREE_CODE (newdecl
) != CONST_DECL
)
2194 layout_decl (newdecl
, 0);
2198 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
2199 DECL_SIZE (newdecl
) = DECL_SIZE (olddecl
);
2200 DECL_SIZE_UNIT (newdecl
) = DECL_SIZE_UNIT (olddecl
);
2201 DECL_MODE (newdecl
) = DECL_MODE (olddecl
);
2202 if (DECL_ALIGN (olddecl
) > DECL_ALIGN (newdecl
))
2204 DECL_ALIGN (newdecl
) = DECL_ALIGN (olddecl
);
2205 DECL_USER_ALIGN (newdecl
) |= DECL_USER_ALIGN (olddecl
);
2209 /* Keep the old rtl since we can safely use it. */
2210 if (HAS_RTL_P (olddecl
))
2211 COPY_DECL_RTL (olddecl
, newdecl
);
2213 /* Merge the type qualifiers. */
2214 if (TREE_READONLY (newdecl
))
2215 TREE_READONLY (olddecl
) = 1;
2217 if (TREE_THIS_VOLATILE (newdecl
))
2218 TREE_THIS_VOLATILE (olddecl
) = 1;
2220 /* Merge deprecatedness. */
2221 if (TREE_DEPRECATED (newdecl
))
2222 TREE_DEPRECATED (olddecl
) = 1;
2224 /* If a decl is in a system header and the other isn't, keep the one on the
2225 system header. Otherwise, keep source location of definition rather than
2226 declaration and of prototype rather than non-prototype unless that
2227 prototype is built-in. */
2228 if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl
), TS_DECL_WITH_VIS
)
2229 && DECL_IN_SYSTEM_HEADER (olddecl
)
2230 && !DECL_IN_SYSTEM_HEADER (newdecl
) )
2231 DECL_SOURCE_LOCATION (newdecl
) = DECL_SOURCE_LOCATION (olddecl
);
2232 else if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl
), TS_DECL_WITH_VIS
)
2233 && DECL_IN_SYSTEM_HEADER (newdecl
)
2234 && !DECL_IN_SYSTEM_HEADER (olddecl
))
2235 DECL_SOURCE_LOCATION (olddecl
) = DECL_SOURCE_LOCATION (newdecl
);
2236 else if ((DECL_INITIAL (newdecl
) == 0 && DECL_INITIAL (olddecl
) != 0)
2237 || (old_is_prototype
&& !new_is_prototype
2238 && !C_DECL_BUILTIN_PROTOTYPE (olddecl
)))
2239 DECL_SOURCE_LOCATION (newdecl
) = DECL_SOURCE_LOCATION (olddecl
);
2241 /* Merge the initialization information. */
2242 if (DECL_INITIAL (newdecl
) == 0)
2243 DECL_INITIAL (newdecl
) = DECL_INITIAL (olddecl
);
2245 /* Merge the threadprivate attribute. */
2246 if (TREE_CODE (olddecl
) == VAR_DECL
&& C_DECL_THREADPRIVATE_P (olddecl
))
2248 DECL_TLS_MODEL (newdecl
) = DECL_TLS_MODEL (olddecl
);
2249 C_DECL_THREADPRIVATE_P (newdecl
) = 1;
2252 if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl
), TS_DECL_WITH_VIS
))
2254 /* Merge the section attribute.
2255 We want to issue an error if the sections conflict but that
2256 must be done later in decl_attributes since we are called
2257 before attributes are assigned. */
2258 if (DECL_SECTION_NAME (newdecl
) == NULL_TREE
)
2259 DECL_SECTION_NAME (newdecl
) = DECL_SECTION_NAME (olddecl
);
2261 /* Copy the assembler name.
2262 Currently, it can only be defined in the prototype. */
2263 COPY_DECL_ASSEMBLER_NAME (olddecl
, newdecl
);
2265 /* Use visibility of whichever declaration had it specified */
2266 if (DECL_VISIBILITY_SPECIFIED (olddecl
))
2268 DECL_VISIBILITY (newdecl
) = DECL_VISIBILITY (olddecl
);
2269 DECL_VISIBILITY_SPECIFIED (newdecl
) = 1;
2272 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2274 DECL_STATIC_CONSTRUCTOR(newdecl
) |= DECL_STATIC_CONSTRUCTOR(olddecl
);
2275 DECL_STATIC_DESTRUCTOR (newdecl
) |= DECL_STATIC_DESTRUCTOR (olddecl
);
2276 DECL_NO_LIMIT_STACK (newdecl
) |= DECL_NO_LIMIT_STACK (olddecl
);
2277 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl
)
2278 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl
);
2279 TREE_THIS_VOLATILE (newdecl
) |= TREE_THIS_VOLATILE (olddecl
);
2280 DECL_IS_MALLOC (newdecl
) |= DECL_IS_MALLOC (olddecl
);
2281 DECL_IS_OPERATOR_NEW (newdecl
) |= DECL_IS_OPERATOR_NEW (olddecl
);
2282 TREE_READONLY (newdecl
) |= TREE_READONLY (olddecl
);
2283 DECL_PURE_P (newdecl
) |= DECL_PURE_P (olddecl
);
2284 DECL_IS_NOVOPS (newdecl
) |= DECL_IS_NOVOPS (olddecl
);
2287 /* Merge the storage class information. */
2288 merge_weak (newdecl
, olddecl
);
2290 /* For functions, static overrides non-static. */
2291 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2293 TREE_PUBLIC (newdecl
) &= TREE_PUBLIC (olddecl
);
2294 /* This is since we don't automatically
2295 copy the attributes of NEWDECL into OLDDECL. */
2296 TREE_PUBLIC (olddecl
) = TREE_PUBLIC (newdecl
);
2297 /* If this clears `static', clear it in the identifier too. */
2298 if (!TREE_PUBLIC (olddecl
))
2299 TREE_PUBLIC (DECL_NAME (olddecl
)) = 0;
2303 /* In c99, 'extern' declaration before (or after) 'inline' means this
2304 function is not DECL_EXTERNAL, unless 'gnu_inline' attribute
2306 if (TREE_CODE (newdecl
) == FUNCTION_DECL
2307 && !flag_gnu89_inline
2308 && (DECL_DECLARED_INLINE_P (newdecl
)
2309 || DECL_DECLARED_INLINE_P (olddecl
))
2310 && (!DECL_DECLARED_INLINE_P (newdecl
)
2311 || !DECL_DECLARED_INLINE_P (olddecl
)
2312 || !DECL_EXTERNAL (olddecl
))
2313 && DECL_EXTERNAL (newdecl
)
2314 && !lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (newdecl
))
2315 && !current_function_decl
)
2316 DECL_EXTERNAL (newdecl
) = 0;
2318 if (DECL_EXTERNAL (newdecl
))
2320 TREE_STATIC (newdecl
) = TREE_STATIC (olddecl
);
2321 DECL_EXTERNAL (newdecl
) = DECL_EXTERNAL (olddecl
);
2323 /* An extern decl does not override previous storage class. */
2324 TREE_PUBLIC (newdecl
) = TREE_PUBLIC (olddecl
);
2325 if (!DECL_EXTERNAL (newdecl
))
2327 DECL_CONTEXT (newdecl
) = DECL_CONTEXT (olddecl
);
2328 DECL_COMMON (newdecl
) = DECL_COMMON (olddecl
);
2333 TREE_STATIC (olddecl
) = TREE_STATIC (newdecl
);
2334 TREE_PUBLIC (olddecl
) = TREE_PUBLIC (newdecl
);
2337 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2339 /* If we're redefining a function previously defined as extern
2340 inline, make sure we emit debug info for the inline before we
2341 throw it away, in case it was inlined into a function that
2342 hasn't been written out yet. */
2343 if (new_is_definition
&& DECL_INITIAL (olddecl
))
2344 /* The new defn must not be inline. */
2345 DECL_UNINLINABLE (newdecl
) = 1;
2348 /* If either decl says `inline', this fn is inline, unless
2349 its definition was passed already. */
2350 if (DECL_DECLARED_INLINE_P (newdecl
)
2351 || DECL_DECLARED_INLINE_P (olddecl
))
2352 DECL_DECLARED_INLINE_P (newdecl
) = 1;
2354 DECL_UNINLINABLE (newdecl
) = DECL_UNINLINABLE (olddecl
)
2355 = (DECL_UNINLINABLE (newdecl
) || DECL_UNINLINABLE (olddecl
));
2357 DECL_DISREGARD_INLINE_LIMITS (newdecl
)
2358 = DECL_DISREGARD_INLINE_LIMITS (olddecl
)
2359 = (DECL_DISREGARD_INLINE_LIMITS (newdecl
)
2360 || DECL_DISREGARD_INLINE_LIMITS (olddecl
));
2363 if (DECL_BUILT_IN (olddecl
))
2365 /* If redeclaring a builtin function, it stays built in.
2366 But it gets tagged as having been declared. */
2367 DECL_BUILT_IN_CLASS (newdecl
) = DECL_BUILT_IN_CLASS (olddecl
);
2368 DECL_FUNCTION_CODE (newdecl
) = DECL_FUNCTION_CODE (olddecl
);
2369 C_DECL_DECLARED_BUILTIN (newdecl
) = 1;
2370 if (new_is_prototype
)
2371 C_DECL_BUILTIN_PROTOTYPE (newdecl
) = 0;
2373 C_DECL_BUILTIN_PROTOTYPE (newdecl
)
2374 = C_DECL_BUILTIN_PROTOTYPE (olddecl
);
2377 /* Preserve function specific target and optimization options */
2378 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl
)
2379 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl
))
2380 DECL_FUNCTION_SPECIFIC_TARGET (newdecl
)
2381 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl
);
2383 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl
)
2384 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl
))
2385 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl
)
2386 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl
);
2388 /* Also preserve various other info from the definition. */
2389 if (!new_is_definition
)
2392 DECL_RESULT (newdecl
) = DECL_RESULT (olddecl
);
2393 DECL_INITIAL (newdecl
) = DECL_INITIAL (olddecl
);
2394 DECL_STRUCT_FUNCTION (newdecl
) = DECL_STRUCT_FUNCTION (olddecl
);
2395 DECL_SAVED_TREE (newdecl
) = DECL_SAVED_TREE (olddecl
);
2396 DECL_ARGUMENTS (newdecl
) = copy_list (DECL_ARGUMENTS (olddecl
));
2397 for (t
= DECL_ARGUMENTS (newdecl
); t
; t
= DECL_CHAIN (t
))
2398 DECL_CONTEXT (t
) = newdecl
;
2400 /* See if we've got a function to instantiate from. */
2401 if (DECL_SAVED_TREE (olddecl
))
2402 DECL_ABSTRACT_ORIGIN (newdecl
)
2403 = DECL_ABSTRACT_ORIGIN (olddecl
);
2407 extern_changed
= DECL_EXTERNAL (olddecl
) && !DECL_EXTERNAL (newdecl
);
2409 /* Merge the USED information. */
2410 if (TREE_USED (olddecl
))
2411 TREE_USED (newdecl
) = 1;
2412 else if (TREE_USED (newdecl
))
2413 TREE_USED (olddecl
) = 1;
2414 if (TREE_CODE (olddecl
) == VAR_DECL
|| TREE_CODE (olddecl
) == PARM_DECL
)
2415 DECL_READ_P (newdecl
) |= DECL_READ_P (olddecl
);
2416 if (DECL_PRESERVE_P (olddecl
))
2417 DECL_PRESERVE_P (newdecl
) = 1;
2418 else if (DECL_PRESERVE_P (newdecl
))
2419 DECL_PRESERVE_P (olddecl
) = 1;
2421 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
2422 But preserve OLDDECL's DECL_UID, DECL_CONTEXT and
2423 DECL_ARGUMENTS (if appropriate). */
2425 unsigned olddecl_uid
= DECL_UID (olddecl
);
2426 tree olddecl_context
= DECL_CONTEXT (olddecl
);
2427 tree olddecl_arguments
= NULL
;
2428 if (TREE_CODE (olddecl
) == FUNCTION_DECL
)
2429 olddecl_arguments
= DECL_ARGUMENTS (olddecl
);
2431 memcpy ((char *) olddecl
+ sizeof (struct tree_common
),
2432 (char *) newdecl
+ sizeof (struct tree_common
),
2433 sizeof (struct tree_decl_common
) - sizeof (struct tree_common
));
2434 switch (TREE_CODE (olddecl
))
2444 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
2445 (char *) newdecl
+ sizeof (struct tree_decl_common
),
2446 tree_code_size (TREE_CODE (olddecl
)) - sizeof (struct tree_decl_common
));
2451 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
2452 (char *) newdecl
+ sizeof (struct tree_decl_common
),
2453 sizeof (struct tree_decl_non_common
) - sizeof (struct tree_decl_common
));
2455 DECL_UID (olddecl
) = olddecl_uid
;
2456 DECL_CONTEXT (olddecl
) = olddecl_context
;
2457 if (TREE_CODE (olddecl
) == FUNCTION_DECL
)
2458 DECL_ARGUMENTS (olddecl
) = olddecl_arguments
;
2461 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2462 so that encode_section_info has a chance to look at the new decl
2463 flags and attributes. */
2464 if (DECL_RTL_SET_P (olddecl
)
2465 && (TREE_CODE (olddecl
) == FUNCTION_DECL
2466 || (TREE_CODE (olddecl
) == VAR_DECL
2467 && TREE_STATIC (olddecl
))))
2468 make_decl_rtl (olddecl
);
2470 /* If we changed a function from DECL_EXTERNAL to !DECL_EXTERNAL,
2471 and the definition is coming from the old version, cgraph needs
2472 to be called again. */
2473 if (extern_changed
&& !new_is_definition
2474 && TREE_CODE (olddecl
) == FUNCTION_DECL
&& DECL_INITIAL (olddecl
))
2475 cgraph_mark_if_needed (olddecl
);
2478 /* Handle when a new declaration NEWDECL has the same name as an old
2479 one OLDDECL in the same binding contour. Prints an error message
2482 If safely possible, alter OLDDECL to look like NEWDECL, and return
2483 true. Otherwise, return false. */
2486 duplicate_decls (tree newdecl
, tree olddecl
)
2488 tree newtype
= NULL
, oldtype
= NULL
;
2490 if (!diagnose_mismatched_decls (newdecl
, olddecl
, &newtype
, &oldtype
))
2492 /* Avoid `unused variable' and other warnings for OLDDECL. */
2493 TREE_NO_WARNING (olddecl
) = 1;
2497 merge_decls (newdecl
, olddecl
, newtype
, oldtype
);
2502 /* Check whether decl-node NEW_DECL shadows an existing declaration. */
2504 warn_if_shadowing (tree new_decl
)
2506 struct c_binding
*b
;
2508 /* Shadow warnings wanted? */
2510 /* No shadow warnings for internally generated vars. */
2511 || DECL_IS_BUILTIN (new_decl
)
2512 /* No shadow warnings for vars made for inlining. */
2513 || DECL_FROM_INLINE (new_decl
))
2516 /* Is anything being shadowed? Invisible decls do not count. */
2517 for (b
= I_SYMBOL_BINDING (DECL_NAME (new_decl
)); b
; b
= b
->shadowed
)
2518 if (b
->decl
&& b
->decl
!= new_decl
&& !b
->invisible
)
2520 tree old_decl
= b
->decl
;
2522 if (old_decl
== error_mark_node
)
2524 warning (OPT_Wshadow
, "declaration of %q+D shadows previous "
2525 "non-variable", new_decl
);
2528 else if (TREE_CODE (old_decl
) == PARM_DECL
)
2529 warning (OPT_Wshadow
, "declaration of %q+D shadows a parameter",
2531 else if (DECL_FILE_SCOPE_P (old_decl
))
2532 warning (OPT_Wshadow
, "declaration of %q+D shadows a global "
2533 "declaration", new_decl
);
2534 else if (TREE_CODE (old_decl
) == FUNCTION_DECL
2535 && DECL_BUILT_IN (old_decl
))
2537 warning (OPT_Wshadow
, "declaration of %q+D shadows "
2538 "a built-in function", new_decl
);
2542 warning (OPT_Wshadow
, "declaration of %q+D shadows a previous local",
2545 warning_at (DECL_SOURCE_LOCATION (old_decl
), OPT_Wshadow
,
2546 "shadowed declaration is here");
2552 /* Record a decl-node X as belonging to the current lexical scope.
2553 Check for errors (such as an incompatible declaration for the same
2554 name already seen in the same scope).
2556 Returns either X or an old decl for the same name.
2557 If an old decl is returned, it may have been smashed
2558 to agree with what X says. */
2563 tree name
= DECL_NAME (x
);
2564 struct c_scope
*scope
= current_scope
;
2565 struct c_binding
*b
;
2566 bool nested
= false;
2567 location_t locus
= DECL_SOURCE_LOCATION (x
);
2569 /* Must set DECL_CONTEXT for everything not at file scope or
2570 DECL_FILE_SCOPE_P won't work. Local externs don't count
2571 unless they have initializers (which generate code). */
2572 if (current_function_decl
2573 && ((TREE_CODE (x
) != FUNCTION_DECL
&& TREE_CODE (x
) != VAR_DECL
)
2574 || DECL_INITIAL (x
) || !DECL_EXTERNAL (x
)))
2575 DECL_CONTEXT (x
) = current_function_decl
;
2577 /* Anonymous decls are just inserted in the scope. */
2580 bind (name
, x
, scope
, /*invisible=*/false, /*nested=*/false,
2585 /* First, see if there is another declaration with the same name in
2586 the current scope. If there is, duplicate_decls may do all the
2587 work for us. If duplicate_decls returns false, that indicates
2588 two incompatible decls in the same scope; we are to silently
2589 replace the old one (duplicate_decls has issued all appropriate
2590 diagnostics). In particular, we should not consider possible
2591 duplicates in the external scope, or shadowing. */
2592 b
= I_SYMBOL_BINDING (name
);
2593 if (b
&& B_IN_SCOPE (b
, scope
))
2595 struct c_binding
*b_ext
, *b_use
;
2596 tree type
= TREE_TYPE (x
);
2597 tree visdecl
= b
->decl
;
2598 tree vistype
= TREE_TYPE (visdecl
);
2599 if (TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
2600 && COMPLETE_TYPE_P (TREE_TYPE (x
)))
2601 b
->inner_comp
= false;
2604 /* If this is an external linkage declaration, we should check
2605 for compatibility with the type in the external scope before
2606 setting the type at this scope based on the visible
2607 information only. */
2608 if (TREE_PUBLIC (x
) && TREE_PUBLIC (visdecl
))
2610 while (b_ext
&& !B_IN_EXTERNAL_SCOPE (b_ext
))
2611 b_ext
= b_ext
->shadowed
;
2616 TREE_TYPE (b_use
->decl
) = b_use
->u
.type
;
2619 if (duplicate_decls (x
, b_use
->decl
))
2623 /* Save the updated type in the external scope and
2624 restore the proper type for this scope. */
2626 if (comptypes (vistype
, type
))
2627 thistype
= composite_type (vistype
, type
);
2629 thistype
= TREE_TYPE (b_use
->decl
);
2630 b_use
->u
.type
= TREE_TYPE (b_use
->decl
);
2631 if (TREE_CODE (b_use
->decl
) == FUNCTION_DECL
2632 && DECL_BUILT_IN (b_use
->decl
))
2634 = build_type_attribute_variant (thistype
,
2637 TREE_TYPE (b_use
->decl
) = thistype
;
2642 goto skip_external_and_shadow_checks
;
2645 /* All declarations with external linkage, and all external
2646 references, go in the external scope, no matter what scope is
2647 current. However, the binding in that scope is ignored for
2648 purposes of normal name lookup. A separate binding structure is
2649 created in the requested scope; this governs the normal
2650 visibility of the symbol.
2652 The binding in the externals scope is used exclusively for
2653 detecting duplicate declarations of the same object, no matter
2654 what scope they are in; this is what we do here. (C99 6.2.7p2:
2655 All declarations that refer to the same object or function shall
2656 have compatible type; otherwise, the behavior is undefined.) */
2657 if (DECL_EXTERNAL (x
) || scope
== file_scope
)
2659 tree type
= TREE_TYPE (x
);
2662 bool type_saved
= false;
2663 if (b
&& !B_IN_EXTERNAL_SCOPE (b
)
2664 && (TREE_CODE (b
->decl
) == FUNCTION_DECL
2665 || TREE_CODE (b
->decl
) == VAR_DECL
)
2666 && DECL_FILE_SCOPE_P (b
->decl
))
2669 vistype
= TREE_TYPE (visdecl
);
2671 if (scope
!= file_scope
2672 && !DECL_IN_SYSTEM_HEADER (x
))
2673 warning (OPT_Wnested_externs
, "nested extern declaration of %qD", x
);
2675 while (b
&& !B_IN_EXTERNAL_SCOPE (b
))
2677 /* If this decl might be modified, save its type. This is
2678 done here rather than when the decl is first bound
2679 because the type may change after first binding, through
2680 being completed or through attributes being added. If we
2681 encounter multiple such decls, only the first should have
2682 its type saved; the others will already have had their
2683 proper types saved and the types will not have changed as
2684 their scopes will not have been re-entered. */
2685 if (DECL_P (b
->decl
) && DECL_FILE_SCOPE_P (b
->decl
) && !type_saved
)
2687 b
->u
.type
= TREE_TYPE (b
->decl
);
2690 if (B_IN_FILE_SCOPE (b
)
2691 && TREE_CODE (b
->decl
) == VAR_DECL
2692 && TREE_STATIC (b
->decl
)
2693 && TREE_CODE (TREE_TYPE (b
->decl
)) == ARRAY_TYPE
2694 && !TYPE_DOMAIN (TREE_TYPE (b
->decl
))
2695 && TREE_CODE (type
) == ARRAY_TYPE
2696 && TYPE_DOMAIN (type
)
2697 && TYPE_MAX_VALUE (TYPE_DOMAIN (type
))
2698 && !integer_zerop (TYPE_MAX_VALUE (TYPE_DOMAIN (type
))))
2700 /* Array type completed in inner scope, which should be
2701 diagnosed if the completion does not have size 1 and
2702 it does not get completed in the file scope. */
2703 b
->inner_comp
= true;
2708 /* If a matching external declaration has been found, set its
2709 type to the composite of all the types of that declaration.
2710 After the consistency checks, it will be reset to the
2711 composite of the visible types only. */
2712 if (b
&& (TREE_PUBLIC (x
) || same_translation_unit_p (x
, b
->decl
))
2714 TREE_TYPE (b
->decl
) = b
->u
.type
;
2716 /* The point of the same_translation_unit_p check here is,
2717 we want to detect a duplicate decl for a construct like
2718 foo() { extern bar(); } ... static bar(); but not if
2719 they are in different translation units. In any case,
2720 the static does not go in the externals scope. */
2722 && (TREE_PUBLIC (x
) || same_translation_unit_p (x
, b
->decl
))
2723 && duplicate_decls (x
, b
->decl
))
2728 if (comptypes (vistype
, type
))
2729 thistype
= composite_type (vistype
, type
);
2731 thistype
= TREE_TYPE (b
->decl
);
2735 b
->u
.type
= TREE_TYPE (b
->decl
);
2736 if (TREE_CODE (b
->decl
) == FUNCTION_DECL
&& DECL_BUILT_IN (b
->decl
))
2738 = build_type_attribute_variant (thistype
,
2739 TYPE_ATTRIBUTES (b
->u
.type
));
2740 TREE_TYPE (b
->decl
) = thistype
;
2741 bind (name
, b
->decl
, scope
, /*invisible=*/false, /*nested=*/true,
2745 else if (TREE_PUBLIC (x
))
2747 if (visdecl
&& !b
&& duplicate_decls (x
, visdecl
))
2749 /* An external declaration at block scope referring to a
2750 visible entity with internal linkage. The composite
2751 type will already be correct for this scope, so we
2752 just need to fall through to make the declaration in
2759 bind (name
, x
, external_scope
, /*invisible=*/true,
2760 /*nested=*/false, locus
);
2766 if (TREE_CODE (x
) != PARM_DECL
)
2767 warn_if_shadowing (x
);
2769 skip_external_and_shadow_checks
:
2770 if (TREE_CODE (x
) == TYPE_DECL
)
2771 set_underlying_type (x
);
2773 bind (name
, x
, scope
, /*invisible=*/false, nested
, locus
);
2775 /* If x's type is incomplete because it's based on a
2776 structure or union which has not yet been fully declared,
2777 attach it to that structure or union type, so we can go
2778 back and complete the variable declaration later, if the
2779 structure or union gets fully declared.
2781 If the input is erroneous, we can have error_mark in the type
2782 slot (e.g. "f(void a, ...)") - that doesn't count as an
2784 if (TREE_TYPE (x
) != error_mark_node
2785 && !COMPLETE_TYPE_P (TREE_TYPE (x
)))
2787 tree element
= TREE_TYPE (x
);
2789 while (TREE_CODE (element
) == ARRAY_TYPE
)
2790 element
= TREE_TYPE (element
);
2791 element
= TYPE_MAIN_VARIANT (element
);
2793 if ((TREE_CODE (element
) == RECORD_TYPE
2794 || TREE_CODE (element
) == UNION_TYPE
)
2795 && (TREE_CODE (x
) != TYPE_DECL
2796 || TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
)
2797 && !COMPLETE_TYPE_P (element
))
2798 C_TYPE_INCOMPLETE_VARS (element
)
2799 = tree_cons (NULL_TREE
, x
, C_TYPE_INCOMPLETE_VARS (element
));
2804 /* Record X as belonging to file scope.
2805 This is used only internally by the Objective-C front end,
2806 and is limited to its needs. duplicate_decls is not called;
2807 if there is any preexisting decl for this identifier, it is an ICE. */
2810 pushdecl_top_level (tree x
)
2813 bool nested
= false;
2814 gcc_assert (TREE_CODE (x
) == VAR_DECL
|| TREE_CODE (x
) == CONST_DECL
);
2816 name
= DECL_NAME (x
);
2818 gcc_assert (TREE_CODE (x
) == CONST_DECL
|| !I_SYMBOL_BINDING (name
));
2820 if (TREE_PUBLIC (x
))
2822 bind (name
, x
, external_scope
, /*invisible=*/true, /*nested=*/false,
2827 bind (name
, x
, file_scope
, /*invisible=*/false, nested
, UNKNOWN_LOCATION
);
2833 implicit_decl_warning (tree id
, tree olddecl
)
2835 if (warn_implicit_function_declaration
)
2840 warned
= pedwarn (input_location
, OPT_Wimplicit_function_declaration
,
2841 "implicit declaration of function %qE", id
);
2843 warned
= warning (OPT_Wimplicit_function_declaration
,
2844 G_("implicit declaration of function %qE"), id
);
2845 if (olddecl
&& warned
)
2846 locate_old_decl (olddecl
);
2850 /* Generate an implicit declaration for identifier FUNCTIONID at LOC as a
2851 function of type int (). */
2854 implicitly_declare (location_t loc
, tree functionid
)
2856 struct c_binding
*b
;
2860 for (b
= I_SYMBOL_BINDING (functionid
); b
; b
= b
->shadowed
)
2862 if (B_IN_SCOPE (b
, external_scope
))
2871 if (decl
== error_mark_node
)
2874 /* FIXME: Objective-C has weird not-really-builtin functions
2875 which are supposed to be visible automatically. They wind up
2876 in the external scope because they're pushed before the file
2877 scope gets created. Catch this here and rebind them into the
2879 if (!DECL_BUILT_IN (decl
) && DECL_IS_BUILTIN (decl
))
2881 bind (functionid
, decl
, file_scope
,
2882 /*invisible=*/false, /*nested=*/true,
2883 DECL_SOURCE_LOCATION (decl
));
2888 tree newtype
= default_function_type
;
2890 TREE_TYPE (decl
) = b
->u
.type
;
2891 /* Implicit declaration of a function already declared
2892 (somehow) in a different scope, or as a built-in.
2893 If this is the first time this has happened, warn;
2894 then recycle the old declaration but with the new type. */
2895 if (!C_DECL_IMPLICIT (decl
))
2897 implicit_decl_warning (functionid
, decl
);
2898 C_DECL_IMPLICIT (decl
) = 1;
2900 if (DECL_BUILT_IN (decl
))
2902 newtype
= build_type_attribute_variant (newtype
,
2904 (TREE_TYPE (decl
)));
2905 if (!comptypes (newtype
, TREE_TYPE (decl
)))
2907 warning_at (loc
, 0, "incompatible implicit declaration of "
2908 "built-in function %qD", decl
);
2909 newtype
= TREE_TYPE (decl
);
2914 if (!comptypes (newtype
, TREE_TYPE (decl
)))
2916 error_at (loc
, "incompatible implicit declaration of function %qD", decl
);
2917 locate_old_decl (decl
);
2920 b
->u
.type
= TREE_TYPE (decl
);
2921 TREE_TYPE (decl
) = newtype
;
2922 bind (functionid
, decl
, current_scope
,
2923 /*invisible=*/false, /*nested=*/true,
2924 DECL_SOURCE_LOCATION (decl
));
2929 /* Not seen before. */
2930 decl
= build_decl (loc
, FUNCTION_DECL
, functionid
, default_function_type
);
2931 DECL_EXTERNAL (decl
) = 1;
2932 TREE_PUBLIC (decl
) = 1;
2933 C_DECL_IMPLICIT (decl
) = 1;
2934 implicit_decl_warning (functionid
, 0);
2935 asmspec_tree
= maybe_apply_renaming_pragma (decl
, /*asmname=*/NULL
);
2937 set_user_assembler_name (decl
, TREE_STRING_POINTER (asmspec_tree
));
2939 /* C89 says implicit declarations are in the innermost block.
2940 So we record the decl in the standard fashion. */
2941 decl
= pushdecl (decl
);
2943 /* No need to call objc_check_decl here - it's a function type. */
2944 rest_of_decl_compilation (decl
, 0, 0);
2946 /* Write a record describing this implicit function declaration
2947 to the prototypes file (if requested). */
2948 gen_aux_info_record (decl
, 0, 1, 0);
2950 /* Possibly apply some default attributes to this implicit declaration. */
2951 decl_attributes (&decl
, NULL_TREE
, 0);
2956 /* Issue an error message for a reference to an undeclared variable
2957 ID, including a reference to a builtin outside of function-call
2958 context. Establish a binding of the identifier to error_mark_node
2959 in an appropriate scope, which will suppress further errors for the
2960 same identifier. The error message should be given location LOC. */
2962 undeclared_variable (location_t loc
, tree id
)
2964 static bool already
= false;
2965 struct c_scope
*scope
;
2967 if (current_function_decl
== 0)
2969 error_at (loc
, "%qE undeclared here (not in a function)", id
);
2970 scope
= current_scope
;
2974 error_at (loc
, "%qE undeclared (first use in this function)", id
);
2977 inform (loc
, "each undeclared identifier is reported only"
2978 " once for each function it appears in");
2982 /* If we are parsing old-style parameter decls, current_function_decl
2983 will be nonnull but current_function_scope will be null. */
2984 scope
= current_function_scope
? current_function_scope
: current_scope
;
2986 bind (id
, error_mark_node
, scope
, /*invisible=*/false, /*nested=*/false,
2990 /* Subroutine of lookup_label, declare_label, define_label: construct a
2991 LABEL_DECL with all the proper frills. Also create a struct
2992 c_label_vars initialized for the current scope. */
2995 make_label (location_t location
, tree name
, bool defining
,
2996 struct c_label_vars
**p_label_vars
)
2998 tree label
= build_decl (location
, LABEL_DECL
, name
, void_type_node
);
2999 struct c_label_vars
*label_vars
;
3001 DECL_CONTEXT (label
) = current_function_decl
;
3002 DECL_MODE (label
) = VOIDmode
;
3004 label_vars
= ggc_alloc_c_label_vars ();
3005 label_vars
->shadowed
= NULL
;
3006 set_spot_bindings (&label_vars
->label_bindings
, defining
);
3007 label_vars
->decls_in_scope
= make_tree_vector ();
3008 label_vars
->gotos
= VEC_alloc (c_goto_bindings_p
, gc
, 0);
3009 *p_label_vars
= label_vars
;
3014 /* Get the LABEL_DECL corresponding to identifier NAME as a label.
3015 Create one if none exists so far for the current function.
3016 This is called when a label is used in a goto expression or
3017 has its address taken. */
3020 lookup_label (tree name
)
3023 struct c_label_vars
*label_vars
;
3025 if (current_function_decl
== 0)
3027 error ("label %qE referenced outside of any function", name
);
3031 /* Use a label already defined or ref'd with this name, but not if
3032 it is inherited from a containing function and wasn't declared
3034 label
= I_LABEL_DECL (name
);
3035 if (label
&& (DECL_CONTEXT (label
) == current_function_decl
3036 || C_DECLARED_LABEL_FLAG (label
)))
3038 /* If the label has only been declared, update its apparent
3039 location to point here, for better diagnostics if it
3040 turns out not to have been defined. */
3041 if (DECL_INITIAL (label
) == NULL_TREE
)
3042 DECL_SOURCE_LOCATION (label
) = input_location
;
3046 /* No label binding for that identifier; make one. */
3047 label
= make_label (input_location
, name
, false, &label_vars
);
3049 /* Ordinary labels go in the current function scope. */
3050 bind_label (name
, label
, current_function_scope
, label_vars
);
3055 /* Issue a warning about DECL for a goto statement at GOTO_LOC going
3059 warn_about_goto (location_t goto_loc
, tree label
, tree decl
)
3061 if (variably_modified_type_p (TREE_TYPE (decl
), NULL_TREE
))
3063 "jump into scope of identifier with variably modified type");
3065 warning_at (goto_loc
, OPT_Wjump_misses_init
,
3066 "jump skips variable initialization");
3067 inform (DECL_SOURCE_LOCATION (label
), "label %qD defined here", label
);
3068 inform (DECL_SOURCE_LOCATION (decl
), "%qD declared here", decl
);
3071 /* Look up a label because of a goto statement. This is like
3072 lookup_label, but also issues any appropriate warnings. */
3075 lookup_label_for_goto (location_t loc
, tree name
)
3078 struct c_label_vars
*label_vars
;
3082 label
= lookup_label (name
);
3083 if (label
== NULL_TREE
)
3086 /* If we are jumping to a different function, we can't issue any
3088 if (DECL_CONTEXT (label
) != current_function_decl
)
3090 gcc_assert (C_DECLARED_LABEL_FLAG (label
));
3094 label_vars
= I_LABEL_BINDING (name
)->u
.label
;
3096 /* If the label has not yet been defined, then push this goto on a
3097 list for possible later warnings. */
3098 if (label_vars
->label_bindings
.scope
== NULL
)
3100 struct c_goto_bindings
*g
;
3102 g
= ggc_alloc_c_goto_bindings ();
3104 set_spot_bindings (&g
->goto_bindings
, true);
3105 VEC_safe_push (c_goto_bindings_p
, gc
, label_vars
->gotos
, g
);
3109 /* If there are any decls in label_vars->decls_in_scope, then this
3110 goto has missed the declaration of the decl. This happens for a
3116 Issue a warning or error. */
3117 FOR_EACH_VEC_ELT (tree
, label_vars
->decls_in_scope
, ix
, decl
)
3118 warn_about_goto (loc
, label
, decl
);
3120 if (label_vars
->label_bindings
.left_stmt_expr
)
3122 error_at (loc
, "jump into statement expression");
3123 inform (DECL_SOURCE_LOCATION (label
), "label %qD defined here", label
);
3129 /* Make a label named NAME in the current function, shadowing silently
3130 any that may be inherited from containing functions or containing
3131 scopes. This is called for __label__ declarations. */
3134 declare_label (tree name
)
3136 struct c_binding
*b
= I_LABEL_BINDING (name
);
3138 struct c_label_vars
*label_vars
;
3140 /* Check to make sure that the label hasn't already been declared
3142 if (b
&& B_IN_CURRENT_SCOPE (b
))
3144 error ("duplicate label declaration %qE", name
);
3145 locate_old_decl (b
->decl
);
3147 /* Just use the previous declaration. */
3151 label
= make_label (input_location
, name
, false, &label_vars
);
3152 C_DECLARED_LABEL_FLAG (label
) = 1;
3154 /* Declared labels go in the current scope. */
3155 bind_label (name
, label
, current_scope
, label_vars
);
3160 /* When we define a label, issue any appropriate warnings if there are
3161 any gotos earlier in the function which jump to this label. */
3164 check_earlier_gotos (tree label
, struct c_label_vars
* label_vars
)
3167 struct c_goto_bindings
*g
;
3169 FOR_EACH_VEC_ELT (c_goto_bindings_p
, label_vars
->gotos
, ix
, g
)
3171 struct c_binding
*b
;
3172 struct c_scope
*scope
;
3174 /* We have a goto to this label. The goto is going forward. In
3175 g->scope, the goto is going to skip any binding which was
3176 defined after g->bindings_in_scope. */
3177 for (b
= g
->goto_bindings
.scope
->bindings
;
3178 b
!= g
->goto_bindings
.bindings_in_scope
;
3181 if (decl_jump_unsafe (b
->decl
))
3182 warn_about_goto (g
->loc
, label
, b
->decl
);
3185 /* We also need to warn about decls defined in any scopes
3186 between the scope of the label and the scope of the goto. */
3187 for (scope
= label_vars
->label_bindings
.scope
;
3188 scope
!= g
->goto_bindings
.scope
;
3189 scope
= scope
->outer
)
3191 gcc_assert (scope
!= NULL
);
3192 if (scope
== label_vars
->label_bindings
.scope
)
3193 b
= label_vars
->label_bindings
.bindings_in_scope
;
3195 b
= scope
->bindings
;
3196 for (; b
!= NULL
; b
= b
->prev
)
3198 if (decl_jump_unsafe (b
->decl
))
3199 warn_about_goto (g
->loc
, label
, b
->decl
);
3203 if (g
->goto_bindings
.stmt_exprs
> 0)
3205 error_at (g
->loc
, "jump into statement expression");
3206 inform (DECL_SOURCE_LOCATION (label
), "label %qD defined here",
3211 /* Now that the label is defined, we will issue warnings about
3212 subsequent gotos to this label when we see them. */
3213 VEC_truncate (c_goto_bindings_p
, label_vars
->gotos
, 0);
3214 label_vars
->gotos
= NULL
;
3217 /* Define a label, specifying the location in the source file.
3218 Return the LABEL_DECL node for the label, if the definition is valid.
3219 Otherwise return 0. */
3222 define_label (location_t location
, tree name
)
3224 /* Find any preexisting label with this name. It is an error
3225 if that label has already been defined in this function, or
3226 if there is a containing function with a declared label with
3228 tree label
= I_LABEL_DECL (name
);
3231 && ((DECL_CONTEXT (label
) == current_function_decl
3232 && DECL_INITIAL (label
) != 0)
3233 || (DECL_CONTEXT (label
) != current_function_decl
3234 && C_DECLARED_LABEL_FLAG (label
))))
3236 error_at (location
, "duplicate label %qD", label
);
3237 locate_old_decl (label
);
3240 else if (label
&& DECL_CONTEXT (label
) == current_function_decl
)
3242 struct c_label_vars
*label_vars
= I_LABEL_BINDING (name
)->u
.label
;
3244 /* The label has been used or declared already in this function,
3245 but not defined. Update its location to point to this
3247 DECL_SOURCE_LOCATION (label
) = location
;
3248 set_spot_bindings (&label_vars
->label_bindings
, true);
3250 /* Issue warnings as required about any goto statements from
3251 earlier in the function. */
3252 check_earlier_gotos (label
, label_vars
);
3256 struct c_label_vars
*label_vars
;
3258 /* No label binding for that identifier; make one. */
3259 label
= make_label (location
, name
, true, &label_vars
);
3261 /* Ordinary labels go in the current function scope. */
3262 bind_label (name
, label
, current_function_scope
, label_vars
);
3265 if (!in_system_header
&& lookup_name (name
))
3266 warning_at (location
, OPT_Wtraditional
,
3267 "traditional C lacks a separate namespace "
3268 "for labels, identifier %qE conflicts", name
);
3270 /* Mark label as having been defined. */
3271 DECL_INITIAL (label
) = error_mark_node
;
3275 /* Get the bindings for a new switch statement. This is used to issue
3276 warnings as appropriate for jumps from the switch to case or
3279 struct c_spot_bindings
*
3280 c_get_switch_bindings (void)
3282 struct c_spot_bindings
*switch_bindings
;
3284 switch_bindings
= XNEW (struct c_spot_bindings
);
3285 set_spot_bindings (switch_bindings
, true);
3286 return switch_bindings
;
3290 c_release_switch_bindings (struct c_spot_bindings
*bindings
)
3292 gcc_assert (bindings
->stmt_exprs
== 0 && !bindings
->left_stmt_expr
);
3296 /* This is called at the point of a case or default label to issue
3297 warnings about decls as needed. It returns true if it found an
3298 error, not just a warning. */
3301 c_check_switch_jump_warnings (struct c_spot_bindings
*switch_bindings
,
3302 location_t switch_loc
, location_t case_loc
)
3305 struct c_scope
*scope
;
3308 for (scope
= current_scope
;
3309 scope
!= switch_bindings
->scope
;
3310 scope
= scope
->outer
)
3312 struct c_binding
*b
;
3314 gcc_assert (scope
!= NULL
);
3315 for (b
= scope
->bindings
; b
!= NULL
; b
= b
->prev
)
3317 if (decl_jump_unsafe (b
->decl
))
3319 if (variably_modified_type_p (TREE_TYPE (b
->decl
), NULL_TREE
))
3323 ("switch jumps into scope of identifier with "
3324 "variably modified type"));
3327 warning_at (case_loc
, OPT_Wjump_misses_init
,
3328 "switch jumps over variable initialization");
3329 inform (switch_loc
, "switch starts here");
3330 inform (DECL_SOURCE_LOCATION (b
->decl
), "%qD declared here",
3336 if (switch_bindings
->stmt_exprs
> 0)
3339 error_at (case_loc
, "switch jumps into statement expression");
3340 inform (switch_loc
, "switch starts here");
3346 /* Given NAME, an IDENTIFIER_NODE,
3347 return the structure (or union or enum) definition for that name.
3348 If THISLEVEL_ONLY is nonzero, searches only the current_scope.
3349 CODE says which kind of type the caller wants;
3350 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
3351 If PLOC is not NULL and this returns non-null, it sets *PLOC to the
3352 location where the tag was defined.
3353 If the wrong kind of type is found, an error is reported. */
3356 lookup_tag (enum tree_code code
, tree name
, int thislevel_only
,
3359 struct c_binding
*b
= I_TAG_BINDING (name
);
3365 /* We only care about whether it's in this level if
3366 thislevel_only was set or it might be a type clash. */
3367 if (thislevel_only
|| TREE_CODE (b
->decl
) != code
)
3369 /* For our purposes, a tag in the external scope is the same as
3370 a tag in the file scope. (Primarily relevant to Objective-C
3371 and its builtin structure tags, which get pushed before the
3372 file scope is created.) */
3373 if (B_IN_CURRENT_SCOPE (b
)
3374 || (current_scope
== file_scope
&& B_IN_EXTERNAL_SCOPE (b
)))
3378 if (thislevel_only
&& !thislevel
)
3381 if (TREE_CODE (b
->decl
) != code
)
3383 /* Definition isn't the kind we were looking for. */
3384 pending_invalid_xref
= name
;
3385 pending_invalid_xref_location
= input_location
;
3387 /* If in the same binding level as a declaration as a tag
3388 of a different type, this must not be allowed to
3389 shadow that tag, so give the error immediately.
3390 (For example, "struct foo; union foo;" is invalid.) */
3392 pending_xref_error ();
3401 /* Print an error message now
3402 for a recent invalid struct, union or enum cross reference.
3403 We don't print them immediately because they are not invalid
3404 when used in the `struct foo;' construct for shadowing. */
3407 pending_xref_error (void)
3409 if (pending_invalid_xref
!= 0)
3410 error_at (pending_invalid_xref_location
, "%qE defined as wrong kind of tag",
3411 pending_invalid_xref
);
3412 pending_invalid_xref
= 0;
3416 /* Look up NAME in the current scope and its superiors
3417 in the namespace of variables, functions and typedefs.
3418 Return a ..._DECL node of some kind representing its definition,
3419 or return 0 if it is undefined. */
3422 lookup_name (tree name
)
3424 struct c_binding
*b
= I_SYMBOL_BINDING (name
);
3425 if (b
&& !b
->invisible
)
3430 /* Similar to `lookup_name' but look only at the indicated scope. */
3433 lookup_name_in_scope (tree name
, struct c_scope
*scope
)
3435 struct c_binding
*b
;
3437 for (b
= I_SYMBOL_BINDING (name
); b
; b
= b
->shadowed
)
3438 if (B_IN_SCOPE (b
, scope
))
3443 /* Create the predefined scalar types of C,
3444 and some nodes representing standard constants (0, 1, (void *) 0).
3445 Initialize the global scope.
3446 Make definitions for built-in primitive functions. */
3449 c_init_decl_processing (void)
3451 location_t save_loc
= input_location
;
3453 /* Initialize reserved words for parser. */
3456 current_function_decl
= 0;
3458 gcc_obstack_init (&parser_obstack
);
3460 /* Make the externals scope. */
3462 external_scope
= current_scope
;
3464 /* Declarations from c_common_nodes_and_builtins must not be associated
3465 with this input file, lest we get differences between using and not
3466 using preprocessed headers. */
3467 input_location
= BUILTINS_LOCATION
;
3469 build_common_tree_nodes (flag_signed_char
);
3471 c_common_nodes_and_builtins ();
3473 /* In C, comparisons and TRUTH_* expressions have type int. */
3474 truthvalue_type_node
= integer_type_node
;
3475 truthvalue_true_node
= integer_one_node
;
3476 truthvalue_false_node
= integer_zero_node
;
3478 /* Even in C99, which has a real boolean type. */
3479 pushdecl (build_decl (UNKNOWN_LOCATION
, TYPE_DECL
, get_identifier ("_Bool"),
3480 boolean_type_node
));
3482 input_location
= save_loc
;
3484 pedantic_lvalues
= true;
3486 make_fname_decl
= c_make_fname_decl
;
3487 start_fname_decls ();
3490 /* Create the VAR_DECL at LOC for __FUNCTION__ etc. ID is the name to
3491 give the decl, NAME is the initialization string and TYPE_DEP
3492 indicates whether NAME depended on the type of the function. As we
3493 don't yet implement delayed emission of static data, we mark the
3494 decl as emitted so it is not placed in the output. Anything using
3495 it must therefore pull out the STRING_CST initializer directly.
3499 c_make_fname_decl (location_t loc
, tree id
, int type_dep
)
3501 const char *name
= fname_as_string (type_dep
);
3502 tree decl
, type
, init
;
3503 size_t length
= strlen (name
);
3505 type
= build_array_type (char_type_node
,
3506 build_index_type (size_int (length
)));
3507 type
= c_build_qualified_type (type
, TYPE_QUAL_CONST
);
3509 decl
= build_decl (loc
, VAR_DECL
, id
, type
);
3511 TREE_STATIC (decl
) = 1;
3512 TREE_READONLY (decl
) = 1;
3513 DECL_ARTIFICIAL (decl
) = 1;
3515 init
= build_string (length
+ 1, name
);
3516 free (CONST_CAST (char *, name
));
3517 TREE_TYPE (init
) = type
;
3518 DECL_INITIAL (decl
) = init
;
3520 TREE_USED (decl
) = 1;
3522 if (current_function_decl
3523 /* For invalid programs like this:
3526 const char* p = __FUNCTION__;
3528 the __FUNCTION__ is believed to appear in K&R style function
3529 parameter declarator. In that case we still don't have
3531 && (!seen_error () || current_function_scope
))
3533 DECL_CONTEXT (decl
) = current_function_decl
;
3534 bind (id
, decl
, current_function_scope
,
3535 /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION
);
3538 finish_decl (decl
, loc
, init
, NULL_TREE
, NULL_TREE
);
3544 c_builtin_function (tree decl
)
3546 tree type
= TREE_TYPE (decl
);
3547 tree id
= DECL_NAME (decl
);
3549 const char *name
= IDENTIFIER_POINTER (id
);
3550 C_DECL_BUILTIN_PROTOTYPE (decl
) = (TYPE_ARG_TYPES (type
) != 0);
3552 /* Should never be called on a symbol with a preexisting meaning. */
3553 gcc_assert (!I_SYMBOL_BINDING (id
));
3555 bind (id
, decl
, external_scope
, /*invisible=*/true, /*nested=*/false,
3558 /* Builtins in the implementation namespace are made visible without
3559 needing to be explicitly declared. See push_file_scope. */
3560 if (name
[0] == '_' && (name
[1] == '_' || ISUPPER (name
[1])))
3562 DECL_CHAIN (decl
) = visible_builtins
;
3563 visible_builtins
= decl
;
3570 c_builtin_function_ext_scope (tree decl
)
3572 tree type
= TREE_TYPE (decl
);
3573 tree id
= DECL_NAME (decl
);
3575 const char *name
= IDENTIFIER_POINTER (id
);
3576 C_DECL_BUILTIN_PROTOTYPE (decl
) = (TYPE_ARG_TYPES (type
) != 0);
3578 /* Should never be called on a symbol with a preexisting meaning. */
3579 gcc_assert (!I_SYMBOL_BINDING (id
));
3581 bind (id
, decl
, external_scope
, /*invisible=*/false, /*nested=*/false,
3584 /* Builtins in the implementation namespace are made visible without
3585 needing to be explicitly declared. See push_file_scope. */
3586 if (name
[0] == '_' && (name
[1] == '_' || ISUPPER (name
[1])))
3588 DECL_CHAIN (decl
) = visible_builtins
;
3589 visible_builtins
= decl
;
3595 /* Called when a declaration is seen that contains no names to declare.
3596 If its type is a reference to a structure, union or enum inherited
3597 from a containing scope, shadow that tag name for the current scope
3598 with a forward reference.
3599 If its type defines a new named structure or union
3600 or defines an enum, it is valid but we need not do anything here.
3601 Otherwise, it is an error. */
3604 shadow_tag (const struct c_declspecs
*declspecs
)
3606 shadow_tag_warned (declspecs
, 0);
3609 /* WARNED is 1 if we have done a pedwarn, 2 if we have done a warning,
3612 shadow_tag_warned (const struct c_declspecs
*declspecs
, int warned
)
3614 bool found_tag
= false;
3616 if (declspecs
->type
&& !declspecs
->default_int_p
&& !declspecs
->typedef_p
)
3618 tree value
= declspecs
->type
;
3619 enum tree_code code
= TREE_CODE (value
);
3621 if (code
== RECORD_TYPE
|| code
== UNION_TYPE
|| code
== ENUMERAL_TYPE
)
3622 /* Used to test also that TYPE_SIZE (value) != 0.
3623 That caused warning for `struct foo;' at top level in the file. */
3625 tree name
= TYPE_NAME (value
);
3630 if (declspecs
->restrict_p
)
3632 error ("invalid use of %<restrict%>");
3638 if (warned
!= 1 && code
!= ENUMERAL_TYPE
)
3639 /* Empty unnamed enum OK */
3641 pedwarn (input_location
, 0,
3642 "unnamed struct/union that defines no instances");
3646 else if (!declspecs
->tag_defined_p
3647 && declspecs
->storage_class
!= csc_none
)
3650 pedwarn (input_location
, 0,
3651 "empty declaration with storage class specifier "
3652 "does not redeclare tag");
3654 pending_xref_error ();
3656 else if (!declspecs
->tag_defined_p
3657 && (declspecs
->const_p
3658 || declspecs
->volatile_p
3659 || declspecs
->restrict_p
3660 || declspecs
->address_space
))
3663 pedwarn (input_location
, 0,
3664 "empty declaration with type qualifier "
3665 "does not redeclare tag");
3667 pending_xref_error ();
3671 pending_invalid_xref
= 0;
3672 t
= lookup_tag (code
, name
, 1, NULL
);
3676 t
= make_node (code
);
3677 pushtag (input_location
, name
, t
);
3683 if (warned
!= 1 && !in_system_header
)
3685 pedwarn (input_location
, 0,
3686 "useless type name in empty declaration");
3691 else if (warned
!= 1 && !in_system_header
&& declspecs
->typedef_p
)
3693 pedwarn (input_location
, 0, "useless type name in empty declaration");
3697 pending_invalid_xref
= 0;
3699 if (declspecs
->inline_p
)
3701 error ("%<inline%> in empty declaration");
3705 if (current_scope
== file_scope
&& declspecs
->storage_class
== csc_auto
)
3707 error ("%<auto%> in file-scope empty declaration");
3711 if (current_scope
== file_scope
&& declspecs
->storage_class
== csc_register
)
3713 error ("%<register%> in file-scope empty declaration");
3717 if (!warned
&& !in_system_header
&& declspecs
->storage_class
!= csc_none
)
3719 warning (0, "useless storage class specifier in empty declaration");
3723 if (!warned
&& !in_system_header
&& declspecs
->thread_p
)
3725 warning (0, "useless %<__thread%> in empty declaration");
3729 if (!warned
&& !in_system_header
&& (declspecs
->const_p
3730 || declspecs
->volatile_p
3731 || declspecs
->restrict_p
3732 || declspecs
->address_space
))
3734 warning (0, "useless type qualifier in empty declaration");
3741 pedwarn (input_location
, 0, "empty declaration");
3746 /* Return the qualifiers from SPECS as a bitwise OR of TYPE_QUAL_*
3747 bits. SPECS represents declaration specifiers that the grammar
3748 only permits to contain type qualifiers and attributes. */
3751 quals_from_declspecs (const struct c_declspecs
*specs
)
3753 int quals
= ((specs
->const_p
? TYPE_QUAL_CONST
: 0)
3754 | (specs
->volatile_p
? TYPE_QUAL_VOLATILE
: 0)
3755 | (specs
->restrict_p
? TYPE_QUAL_RESTRICT
: 0)
3756 | (ENCODE_QUAL_ADDR_SPACE (specs
->address_space
)));
3757 gcc_assert (!specs
->type
3758 && !specs
->decl_attr
3759 && specs
->typespec_word
== cts_none
3760 && specs
->storage_class
== csc_none
3761 && !specs
->typedef_p
3762 && !specs
->explicit_signed_p
3763 && !specs
->deprecated_p
3765 && !specs
->long_long_p
3768 && !specs
->unsigned_p
3769 && !specs
->complex_p
3771 && !specs
->thread_p
);
3775 /* Construct an array declarator. LOC is the location of the
3776 beginning of the array (usually the opening brace). EXPR is the
3777 expression inside [], or NULL_TREE. QUALS are the type qualifiers
3778 inside the [] (to be applied to the pointer to which a parameter
3779 array is converted). STATIC_P is true if "static" is inside the
3780 [], false otherwise. VLA_UNSPEC_P is true if the array is [*], a
3781 VLA of unspecified length which is nevertheless a complete type,
3782 false otherwise. The field for the contained declarator is left to
3783 be filled in by set_array_declarator_inner. */
3785 struct c_declarator
*
3786 build_array_declarator (location_t loc
,
3787 tree expr
, struct c_declspecs
*quals
, bool static_p
,
3790 struct c_declarator
*declarator
= XOBNEW (&parser_obstack
,
3791 struct c_declarator
);
3792 declarator
->id_loc
= loc
;
3793 declarator
->kind
= cdk_array
;
3794 declarator
->declarator
= 0;
3795 declarator
->u
.array
.dimen
= expr
;
3798 declarator
->u
.array
.attrs
= quals
->attrs
;
3799 declarator
->u
.array
.quals
= quals_from_declspecs (quals
);
3803 declarator
->u
.array
.attrs
= NULL_TREE
;
3804 declarator
->u
.array
.quals
= 0;
3806 declarator
->u
.array
.static_p
= static_p
;
3807 declarator
->u
.array
.vla_unspec_p
= vla_unspec_p
;
3810 if (static_p
|| quals
!= NULL
)
3811 pedwarn (loc
, OPT_pedantic
,
3812 "ISO C90 does not support %<static%> or type "
3813 "qualifiers in parameter array declarators");
3815 pedwarn (loc
, OPT_pedantic
,
3816 "ISO C90 does not support %<[*]%> array declarators");
3820 if (!current_scope
->parm_flag
)
3823 error_at (loc
, "%<[*]%> not allowed in other than "
3824 "function prototype scope");
3825 declarator
->u
.array
.vla_unspec_p
= false;
3828 current_scope
->had_vla_unspec
= true;
3833 /* Set the contained declarator of an array declarator. DECL is the
3834 declarator, as constructed by build_array_declarator; INNER is what
3835 appears on the left of the []. */
3837 struct c_declarator
*
3838 set_array_declarator_inner (struct c_declarator
*decl
,
3839 struct c_declarator
*inner
)
3841 decl
->declarator
= inner
;
3845 /* INIT is a constructor that forms DECL's initializer. If the final
3846 element initializes a flexible array field, add the size of that
3847 initializer to DECL's size. */
3850 add_flexible_array_elts_to_size (tree decl
, tree init
)
3854 if (VEC_empty (constructor_elt
, CONSTRUCTOR_ELTS (init
)))
3857 elt
= VEC_last (constructor_elt
, CONSTRUCTOR_ELTS (init
))->value
;
3858 type
= TREE_TYPE (elt
);
3859 if (TREE_CODE (type
) == ARRAY_TYPE
3860 && TYPE_SIZE (type
) == NULL_TREE
3861 && TYPE_DOMAIN (type
) != NULL_TREE
3862 && TYPE_MAX_VALUE (TYPE_DOMAIN (type
)) == NULL_TREE
)
3864 complete_array_type (&type
, elt
, false);
3866 = size_binop (PLUS_EXPR
, DECL_SIZE (decl
), TYPE_SIZE (type
));
3867 DECL_SIZE_UNIT (decl
)
3868 = size_binop (PLUS_EXPR
, DECL_SIZE_UNIT (decl
), TYPE_SIZE_UNIT (type
));
3872 /* Decode a "typename", such as "int **", returning a ..._TYPE node.
3873 Set *EXPR, if EXPR not NULL, to any expression to be evaluated
3874 before the type name, and set *EXPR_CONST_OPERANDS, if
3875 EXPR_CONST_OPERANDS not NULL, to indicate whether the type name may
3876 appear in a constant expression. */
3879 groktypename (struct c_type_name
*type_name
, tree
*expr
,
3880 bool *expr_const_operands
)
3883 tree attrs
= type_name
->specs
->attrs
;
3885 type_name
->specs
->attrs
= NULL_TREE
;
3887 type
= grokdeclarator (type_name
->declarator
, type_name
->specs
, TYPENAME
,
3888 false, NULL
, &attrs
, expr
, expr_const_operands
,
3891 /* Apply attributes. */
3892 decl_attributes (&type
, attrs
, 0);
3897 /* Decode a declarator in an ordinary declaration or data definition.
3898 This is called as soon as the type information and variable name
3899 have been parsed, before parsing the initializer if any.
3900 Here we create the ..._DECL node, fill in its type,
3901 and put it on the list of decls for the current context.
3902 The ..._DECL node is returned as the value.
3904 Exception: for arrays where the length is not specified,
3905 the type is left null, to be filled in by `finish_decl'.
3907 Function definitions do not come here; they go to start_function
3908 instead. However, external and forward declarations of functions
3909 do go through here. Structure field declarations are done by
3910 grokfield and not through here. */
3913 start_decl (struct c_declarator
*declarator
, struct c_declspecs
*declspecs
,
3914 bool initialized
, tree attributes
)
3918 tree expr
= NULL_TREE
;
3919 enum deprecated_states deprecated_state
= DEPRECATED_NORMAL
;
3921 /* An object declared as __attribute__((deprecated)) suppresses
3922 warnings of uses of other deprecated items. */
3923 if (lookup_attribute ("deprecated", attributes
))
3924 deprecated_state
= DEPRECATED_SUPPRESS
;
3926 decl
= grokdeclarator (declarator
, declspecs
,
3927 NORMAL
, initialized
, NULL
, &attributes
, &expr
, NULL
,
3935 if (TREE_CODE (decl
) != FUNCTION_DECL
&& MAIN_NAME_P (DECL_NAME (decl
)))
3936 warning (OPT_Wmain
, "%q+D is usually a function", decl
);
3939 /* Is it valid for this decl to have an initializer at all?
3940 If not, set INITIALIZED to zero, which will indirectly
3941 tell 'finish_decl' to ignore the initializer once it is parsed. */
3942 switch (TREE_CODE (decl
))
3945 error ("typedef %qD is initialized (use __typeof__ instead)", decl
);
3950 error ("function %qD is initialized like a variable", decl
);
3955 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3956 error ("parameter %qD is initialized", decl
);
3961 /* Don't allow initializations for incomplete types except for
3962 arrays which might be completed by the initialization. */
3964 /* This can happen if the array size is an undefined macro.
3965 We already gave a warning, so we don't need another one. */
3966 if (TREE_TYPE (decl
) == error_mark_node
)
3968 else if (COMPLETE_TYPE_P (TREE_TYPE (decl
)))
3970 /* A complete type is ok if size is fixed. */
3972 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl
))) != INTEGER_CST
3973 || C_DECL_VARIABLE_SIZE (decl
))
3975 error ("variable-sized object may not be initialized");
3979 else if (TREE_CODE (TREE_TYPE (decl
)) != ARRAY_TYPE
)
3981 error ("variable %qD has initializer but incomplete type", decl
);
3984 else if (C_DECL_VARIABLE_SIZE (decl
))
3986 /* Although C99 is unclear about whether incomplete arrays
3987 of VLAs themselves count as VLAs, it does not make
3988 sense to permit them to be initialized given that
3989 ordinary VLAs may not be initialized. */
3990 error ("variable-sized object may not be initialized");
3997 if (current_scope
== file_scope
)
3998 TREE_STATIC (decl
) = 1;
4000 /* Tell 'pushdecl' this is an initialized decl
4001 even though we don't yet have the initializer expression.
4002 Also tell 'finish_decl' it may store the real initializer. */
4003 DECL_INITIAL (decl
) = error_mark_node
;
4006 /* If this is a function declaration, write a record describing it to the
4007 prototypes file (if requested). */
4009 if (TREE_CODE (decl
) == FUNCTION_DECL
)
4010 gen_aux_info_record (decl
, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl
)) != 0);
4012 /* ANSI specifies that a tentative definition which is not merged with
4013 a non-tentative definition behaves exactly like a definition with an
4014 initializer equal to zero. (Section 3.7.2)
4016 -fno-common gives strict ANSI behavior, though this tends to break
4017 a large body of code that grew up without this rule.
4019 Thread-local variables are never common, since there's no entrenched
4020 body of code to break, and it allows more efficient variable references
4021 in the presence of dynamic linking. */
4023 if (TREE_CODE (decl
) == VAR_DECL
4025 && TREE_PUBLIC (decl
)
4026 && !DECL_THREAD_LOCAL_P (decl
)
4028 DECL_COMMON (decl
) = 1;
4030 /* Set attributes here so if duplicate decl, will have proper attributes. */
4031 decl_attributes (&decl
, attributes
, 0);
4033 /* Handle gnu_inline attribute. */
4034 if (declspecs
->inline_p
4035 && !flag_gnu89_inline
4036 && TREE_CODE (decl
) == FUNCTION_DECL
4037 && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl
))
4038 || current_function_decl
))
4040 if (declspecs
->storage_class
== csc_auto
&& current_scope
!= file_scope
)
4042 else if (declspecs
->storage_class
!= csc_static
)
4043 DECL_EXTERNAL (decl
) = !DECL_EXTERNAL (decl
);
4046 if (TREE_CODE (decl
) == FUNCTION_DECL
4047 && targetm
.calls
.promote_prototypes (TREE_TYPE (decl
)))
4049 struct c_declarator
*ce
= declarator
;
4051 if (ce
->kind
== cdk_pointer
)
4052 ce
= declarator
->declarator
;
4053 if (ce
->kind
== cdk_function
)
4055 tree args
= ce
->u
.arg_info
->parms
;
4056 for (; args
; args
= DECL_CHAIN (args
))
4058 tree type
= TREE_TYPE (args
);
4059 if (type
&& INTEGRAL_TYPE_P (type
)
4060 && TYPE_PRECISION (type
) < TYPE_PRECISION (integer_type_node
))
4061 DECL_ARG_TYPE (args
) = integer_type_node
;
4066 if (TREE_CODE (decl
) == FUNCTION_DECL
4067 && DECL_DECLARED_INLINE_P (decl
)
4068 && DECL_UNINLINABLE (decl
)
4069 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl
)))
4070 warning (OPT_Wattributes
, "inline function %q+D given attribute noinline",
4073 /* C99 6.7.4p3: An inline definition of a function with external
4074 linkage shall not contain a definition of a modifiable object
4075 with static storage duration... */
4076 if (TREE_CODE (decl
) == VAR_DECL
4077 && current_scope
!= file_scope
4078 && TREE_STATIC (decl
)
4079 && !TREE_READONLY (decl
)
4080 && DECL_DECLARED_INLINE_P (current_function_decl
)
4081 && DECL_EXTERNAL (current_function_decl
))
4082 record_inline_static (input_location
, current_function_decl
,
4083 decl
, csi_modifiable
);
4085 /* Add this decl to the current scope.
4086 TEM may equal DECL or it may be a previous decl of the same name. */
4087 tem
= pushdecl (decl
);
4089 if (initialized
&& DECL_EXTERNAL (tem
))
4091 DECL_EXTERNAL (tem
) = 0;
4092 TREE_STATIC (tem
) = 1;
4098 /* Subroutine of finish_decl. TYPE is the type of an uninitialized object
4099 DECL or the non-array element type if DECL is an uninitialized array.
4100 If that type has a const member, diagnose this. */
4103 diagnose_uninitialized_cst_member (tree decl
, tree type
)
4106 for (field
= TYPE_FIELDS (type
); field
; field
= TREE_CHAIN (field
))
4109 if (TREE_CODE (field
) != FIELD_DECL
)
4111 field_type
= strip_array_types (TREE_TYPE (field
));
4113 if (TYPE_QUALS (field_type
) & TYPE_QUAL_CONST
)
4115 warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wc___compat
,
4116 "uninitialized const member in %qT is invalid in C++",
4117 strip_array_types (TREE_TYPE (decl
)));
4118 inform (DECL_SOURCE_LOCATION (field
), "%qD should be initialized", field
);
4121 if (TREE_CODE (field_type
) == RECORD_TYPE
4122 || TREE_CODE (field_type
) == UNION_TYPE
)
4123 diagnose_uninitialized_cst_member (decl
, field_type
);
4127 /* Finish processing of a declaration;
4128 install its initial value.
4129 If ORIGTYPE is not NULL_TREE, it is the original type of INIT.
4130 If the length of an array type is not known before,
4131 it must be determined now, from the initial value, or it is an error.
4133 INIT_LOC is the location of the initial value. */
4136 finish_decl (tree decl
, location_t init_loc
, tree init
,
4137 tree origtype
, tree asmspec_tree
)
4140 bool was_incomplete
= (DECL_SIZE (decl
) == 0);
4141 const char *asmspec
= 0;
4143 /* If a name was specified, get the string. */
4144 if ((TREE_CODE (decl
) == FUNCTION_DECL
|| TREE_CODE (decl
) == VAR_DECL
)
4145 && DECL_FILE_SCOPE_P (decl
))
4146 asmspec_tree
= maybe_apply_renaming_pragma (decl
, asmspec_tree
);
4148 asmspec
= TREE_STRING_POINTER (asmspec_tree
);
4150 if (TREE_CODE (decl
) == VAR_DECL
4151 && TREE_STATIC (decl
)
4152 && global_bindings_p ())
4153 /* So decl is a global variable. Record the types it uses
4154 so that we can decide later to emit debug info for them. */
4155 record_types_used_by_current_var_decl (decl
);
4157 /* If `start_decl' didn't like having an initialization, ignore it now. */
4158 if (init
!= 0 && DECL_INITIAL (decl
) == 0)
4161 /* Don't crash if parm is initialized. */
4162 if (TREE_CODE (decl
) == PARM_DECL
)
4166 store_init_value (init_loc
, decl
, init
, origtype
);
4168 if (c_dialect_objc () && (TREE_CODE (decl
) == VAR_DECL
4169 || TREE_CODE (decl
) == FUNCTION_DECL
4170 || TREE_CODE (decl
) == FIELD_DECL
))
4171 objc_check_decl (decl
);
4173 type
= TREE_TYPE (decl
);
4175 /* Deduce size of array from initialization, if not already known. */
4176 if (TREE_CODE (type
) == ARRAY_TYPE
4177 && TYPE_DOMAIN (type
) == 0
4178 && TREE_CODE (decl
) != TYPE_DECL
)
4181 = (TREE_STATIC (decl
)
4182 /* Even if pedantic, an external linkage array
4183 may have incomplete type at first. */
4184 ? pedantic
&& !TREE_PUBLIC (decl
)
4185 : !DECL_EXTERNAL (decl
));
4187 = complete_array_type (&TREE_TYPE (decl
), DECL_INITIAL (decl
),
4190 /* Get the completed type made by complete_array_type. */
4191 type
= TREE_TYPE (decl
);
4196 error ("initializer fails to determine size of %q+D", decl
);
4201 error ("array size missing in %q+D", decl
);
4202 /* If a `static' var's size isn't known,
4203 make it extern as well as static, so it does not get
4205 If it is not `static', then do not mark extern;
4206 finish_incomplete_decl will give it a default size
4207 and it will get allocated. */
4208 else if (!pedantic
&& TREE_STATIC (decl
) && !TREE_PUBLIC (decl
))
4209 DECL_EXTERNAL (decl
) = 1;
4213 error ("zero or negative size array %q+D", decl
);
4217 /* For global variables, update the copy of the type that
4218 exists in the binding. */
4219 if (TREE_PUBLIC (decl
))
4221 struct c_binding
*b_ext
= I_SYMBOL_BINDING (DECL_NAME (decl
));
4222 while (b_ext
&& !B_IN_EXTERNAL_SCOPE (b_ext
))
4223 b_ext
= b_ext
->shadowed
;
4227 b_ext
->u
.type
= composite_type (b_ext
->u
.type
, type
);
4229 b_ext
->u
.type
= type
;
4238 if (DECL_INITIAL (decl
))
4239 TREE_TYPE (DECL_INITIAL (decl
)) = type
;
4241 layout_decl (decl
, 0);
4244 if (TREE_CODE (decl
) == VAR_DECL
)
4246 if (init
&& TREE_CODE (init
) == CONSTRUCTOR
)
4247 add_flexible_array_elts_to_size (decl
, init
);
4249 if (DECL_SIZE (decl
) == 0 && TREE_TYPE (decl
) != error_mark_node
4250 && COMPLETE_TYPE_P (TREE_TYPE (decl
)))
4251 layout_decl (decl
, 0);
4253 if (DECL_SIZE (decl
) == 0
4254 /* Don't give an error if we already gave one earlier. */
4255 && TREE_TYPE (decl
) != error_mark_node
4256 && (TREE_STATIC (decl
)
4257 /* A static variable with an incomplete type
4258 is an error if it is initialized.
4259 Also if it is not file scope.
4260 Otherwise, let it through, but if it is not `extern'
4261 then it may cause an error message later. */
4262 ? (DECL_INITIAL (decl
) != 0
4263 || !DECL_FILE_SCOPE_P (decl
))
4264 /* An automatic variable with an incomplete type
4266 : !DECL_EXTERNAL (decl
)))
4268 error ("storage size of %q+D isn%'t known", decl
);
4269 TREE_TYPE (decl
) = error_mark_node
;
4272 if ((DECL_EXTERNAL (decl
) || TREE_STATIC (decl
))
4273 && DECL_SIZE (decl
) != 0)
4275 if (TREE_CODE (DECL_SIZE (decl
)) == INTEGER_CST
)
4276 constant_expression_warning (DECL_SIZE (decl
));
4279 error ("storage size of %q+D isn%'t constant", decl
);
4280 TREE_TYPE (decl
) = error_mark_node
;
4284 if (TREE_USED (type
))
4286 TREE_USED (decl
) = 1;
4287 DECL_READ_P (decl
) = 1;
4291 /* If this is a function and an assembler name is specified, reset DECL_RTL
4292 so we can give it its new name. Also, update built_in_decls if it
4293 was a normal built-in. */
4294 if (TREE_CODE (decl
) == FUNCTION_DECL
&& asmspec
)
4296 if (DECL_BUILT_IN_CLASS (decl
) == BUILT_IN_NORMAL
)
4297 set_builtin_user_assembler_name (decl
, asmspec
);
4298 set_user_assembler_name (decl
, asmspec
);
4301 /* If #pragma weak was used, mark the decl weak now. */
4302 maybe_apply_pragma_weak (decl
);
4304 /* Output the assembler code and/or RTL code for variables and functions,
4305 unless the type is an undefined structure or union.
4306 If not, it will get done when the type is completed. */
4308 if (TREE_CODE (decl
) == VAR_DECL
|| TREE_CODE (decl
) == FUNCTION_DECL
)
4310 /* Determine the ELF visibility. */
4311 if (TREE_PUBLIC (decl
))
4312 c_determine_visibility (decl
);
4314 /* This is a no-op in c-lang.c or something real in objc-act.c. */
4315 if (c_dialect_objc ())
4316 objc_check_decl (decl
);
4320 /* If this is not a static variable, issue a warning.
4321 It doesn't make any sense to give an ASMSPEC for an
4322 ordinary, non-register local variable. Historically,
4323 GCC has accepted -- but ignored -- the ASMSPEC in
4325 if (!DECL_FILE_SCOPE_P (decl
)
4326 && TREE_CODE (decl
) == VAR_DECL
4327 && !C_DECL_REGISTER (decl
)
4328 && !TREE_STATIC (decl
))
4329 warning (0, "ignoring asm-specifier for non-static local "
4330 "variable %q+D", decl
);
4332 set_user_assembler_name (decl
, asmspec
);
4335 if (DECL_FILE_SCOPE_P (decl
))
4337 if (DECL_INITIAL (decl
) == NULL_TREE
4338 || DECL_INITIAL (decl
) == error_mark_node
)
4339 /* Don't output anything
4340 when a tentative file-scope definition is seen.
4341 But at end of compilation, do output code for them. */
4342 DECL_DEFER_OUTPUT (decl
) = 1;
4343 rest_of_decl_compilation (decl
, true, 0);
4347 /* In conjunction with an ASMSPEC, the `register'
4348 keyword indicates that we should place the variable
4349 in a particular register. */
4350 if (asmspec
&& C_DECL_REGISTER (decl
))
4352 DECL_HARD_REGISTER (decl
) = 1;
4353 /* This cannot be done for a structure with volatile
4354 fields, on which DECL_REGISTER will have been
4356 if (!DECL_REGISTER (decl
))
4357 error ("cannot put object with volatile field into register");
4360 if (TREE_CODE (decl
) != FUNCTION_DECL
)
4362 /* If we're building a variable sized type, and we might be
4363 reachable other than via the top of the current binding
4364 level, then create a new BIND_EXPR so that we deallocate
4365 the object at the right time. */
4366 /* Note that DECL_SIZE can be null due to errors. */
4367 if (DECL_SIZE (decl
)
4368 && !TREE_CONSTANT (DECL_SIZE (decl
))
4369 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list
))
4372 bind
= build3 (BIND_EXPR
, void_type_node
, NULL
, NULL
, NULL
);
4373 TREE_SIDE_EFFECTS (bind
) = 1;
4375 BIND_EXPR_BODY (bind
) = push_stmt_list ();
4377 add_stmt (build_stmt (DECL_SOURCE_LOCATION (decl
),
4383 if (!DECL_FILE_SCOPE_P (decl
))
4385 /* Recompute the RTL of a local array now
4386 if it used to be an incomplete type. */
4388 && !TREE_STATIC (decl
) && !DECL_EXTERNAL (decl
))
4390 /* If we used it already as memory, it must stay in memory. */
4391 TREE_ADDRESSABLE (decl
) = TREE_USED (decl
);
4392 /* If it's still incomplete now, no init will save it. */
4393 if (DECL_SIZE (decl
) == 0)
4394 DECL_INITIAL (decl
) = 0;
4399 if (TREE_CODE (decl
) == TYPE_DECL
)
4401 if (!DECL_FILE_SCOPE_P (decl
)
4402 && variably_modified_type_p (TREE_TYPE (decl
), NULL_TREE
))
4403 add_stmt (build_stmt (DECL_SOURCE_LOCATION (decl
), DECL_EXPR
, decl
));
4405 rest_of_decl_compilation (decl
, DECL_FILE_SCOPE_P (decl
), 0);
4408 /* At the end of a declaration, throw away any variable type sizes
4409 of types defined inside that declaration. There is no use
4410 computing them in the following function definition. */
4411 if (current_scope
== file_scope
)
4412 get_pending_sizes ();
4414 /* Install a cleanup (aka destructor) if one was given. */
4415 if (TREE_CODE (decl
) == VAR_DECL
&& !TREE_STATIC (decl
))
4417 tree attr
= lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl
));
4420 tree cleanup_id
= TREE_VALUE (TREE_VALUE (attr
));
4421 tree cleanup_decl
= lookup_name (cleanup_id
);
4425 /* Build "cleanup(&decl)" for the destructor. */
4426 cleanup
= build_unary_op (input_location
, ADDR_EXPR
, decl
, 0);
4427 vec
= VEC_alloc (tree
, gc
, 1);
4428 VEC_quick_push (tree
, vec
, cleanup
);
4429 cleanup
= build_function_call_vec (DECL_SOURCE_LOCATION (decl
),
4430 cleanup_decl
, vec
, NULL
);
4431 VEC_free (tree
, gc
, vec
);
4433 /* Don't warn about decl unused; the cleanup uses it. */
4434 TREE_USED (decl
) = 1;
4435 TREE_USED (cleanup_decl
) = 1;
4436 DECL_READ_P (decl
) = 1;
4438 push_cleanup (decl
, cleanup
, false);
4443 && TREE_CODE (decl
) == VAR_DECL
4444 && !DECL_EXTERNAL (decl
)
4445 && DECL_INITIAL (decl
) == NULL_TREE
)
4447 type
= strip_array_types (type
);
4448 if (TREE_READONLY (decl
))
4449 warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wc___compat
,
4450 "uninitialized const %qD is invalid in C++", decl
);
4451 else if ((TREE_CODE (type
) == RECORD_TYPE
4452 || TREE_CODE (type
) == UNION_TYPE
)
4453 && C_TYPE_FIELDS_READONLY (type
))
4454 diagnose_uninitialized_cst_member (decl
, type
);
4458 /* Given a parsed parameter declaration, decode it into a PARM_DECL. */
4461 grokparm (const struct c_parm
*parm
)
4463 tree attrs
= parm
->attrs
;
4464 tree decl
= grokdeclarator (parm
->declarator
, parm
->specs
, PARM
, false,
4465 NULL
, &attrs
, NULL
, NULL
, DEPRECATED_NORMAL
);
4467 decl_attributes (&decl
, attrs
, 0);
4472 /* Given a parsed parameter declaration, decode it into a PARM_DECL
4473 and push that on the current scope. */
4476 push_parm_decl (const struct c_parm
*parm
)
4478 tree attrs
= parm
->attrs
;
4481 decl
= grokdeclarator (parm
->declarator
, parm
->specs
, PARM
, false, NULL
,
4482 &attrs
, NULL
, NULL
, DEPRECATED_NORMAL
);
4483 decl_attributes (&decl
, attrs
, 0);
4485 decl
= pushdecl (decl
);
4487 finish_decl (decl
, input_location
, NULL_TREE
, NULL_TREE
, NULL_TREE
);
4490 /* Mark all the parameter declarations to date as forward decls.
4491 Also diagnose use of this extension. */
4494 mark_forward_parm_decls (void)
4496 struct c_binding
*b
;
4498 if (pedantic
&& !current_scope
->warned_forward_parm_decls
)
4500 pedwarn (input_location
, OPT_pedantic
,
4501 "ISO C forbids forward parameter declarations");
4502 current_scope
->warned_forward_parm_decls
= true;
4505 for (b
= current_scope
->bindings
; b
; b
= b
->prev
)
4506 if (TREE_CODE (b
->decl
) == PARM_DECL
)
4507 TREE_ASM_WRITTEN (b
->decl
) = 1;
4510 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
4511 literal, which may be an incomplete array type completed by the
4512 initializer; INIT is a CONSTRUCTOR at LOC that initializes the compound
4513 literal. NON_CONST is true if the initializers contain something
4514 that cannot occur in a constant expression. */
4517 build_compound_literal (location_t loc
, tree type
, tree init
, bool non_const
)
4519 /* We do not use start_decl here because we have a type, not a declarator;
4520 and do not use finish_decl because the decl should be stored inside
4521 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_EXPR. */
4526 if (type
== error_mark_node
4527 || init
== error_mark_node
)
4528 return error_mark_node
;
4530 decl
= build_decl (loc
, VAR_DECL
, NULL_TREE
, type
);
4531 DECL_EXTERNAL (decl
) = 0;
4532 TREE_PUBLIC (decl
) = 0;
4533 TREE_STATIC (decl
) = (current_scope
== file_scope
);
4534 DECL_CONTEXT (decl
) = current_function_decl
;
4535 TREE_USED (decl
) = 1;
4536 DECL_READ_P (decl
) = 1;
4537 TREE_TYPE (decl
) = type
;
4538 TREE_READONLY (decl
) = TYPE_READONLY (type
);
4539 store_init_value (loc
, decl
, init
, NULL_TREE
);
4541 if (TREE_CODE (type
) == ARRAY_TYPE
&& !COMPLETE_TYPE_P (type
))
4543 int failure
= complete_array_type (&TREE_TYPE (decl
),
4544 DECL_INITIAL (decl
), true);
4545 gcc_assert (!failure
);
4547 type
= TREE_TYPE (decl
);
4548 TREE_TYPE (DECL_INITIAL (decl
)) = type
;
4551 if (type
== error_mark_node
|| !COMPLETE_TYPE_P (type
))
4552 return error_mark_node
;
4554 stmt
= build_stmt (DECL_SOURCE_LOCATION (decl
), DECL_EXPR
, decl
);
4555 complit
= build1 (COMPOUND_LITERAL_EXPR
, type
, stmt
);
4556 TREE_SIDE_EFFECTS (complit
) = 1;
4558 layout_decl (decl
, 0);
4560 if (TREE_STATIC (decl
))
4562 /* This decl needs a name for the assembler output. */
4563 set_compound_literal_name (decl
);
4564 DECL_DEFER_OUTPUT (decl
) = 1;
4565 DECL_COMDAT (decl
) = 1;
4566 DECL_ARTIFICIAL (decl
) = 1;
4567 DECL_IGNORED_P (decl
) = 1;
4569 rest_of_decl_compilation (decl
, 1, 0);
4574 complit
= build2 (C_MAYBE_CONST_EXPR
, type
, NULL
, complit
);
4575 C_MAYBE_CONST_EXPR_NON_CONST (complit
) = 1;
4581 /* Check the type of a compound literal. Here we just check that it
4582 is valid for C++. */
4585 check_compound_literal_type (location_t loc
, struct c_type_name
*type_name
)
4587 if (warn_cxx_compat
&& type_name
->specs
->tag_defined_p
)
4588 warning_at (loc
, OPT_Wc___compat
,
4589 "defining a type in a compound literal is invalid in C++");
4592 /* Determine whether TYPE is a structure with a flexible array member,
4593 or a union containing such a structure (possibly recursively). */
4596 flexible_array_type_p (tree type
)
4599 switch (TREE_CODE (type
))
4602 x
= TYPE_FIELDS (type
);
4605 while (DECL_CHAIN (x
) != NULL_TREE
)
4607 if (TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
4608 && TYPE_SIZE (TREE_TYPE (x
)) == NULL_TREE
4609 && TYPE_DOMAIN (TREE_TYPE (x
)) != NULL_TREE
4610 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x
))) == NULL_TREE
)
4614 for (x
= TYPE_FIELDS (type
); x
!= NULL_TREE
; x
= DECL_CHAIN (x
))
4616 if (flexible_array_type_p (TREE_TYPE (x
)))
4625 /* Performs sanity checks on the TYPE and WIDTH of the bit-field NAME,
4626 replacing with appropriate values if they are invalid. */
4628 check_bitfield_type_and_width (tree
*type
, tree
*width
, tree orig_name
)
4631 unsigned int max_width
;
4632 unsigned HOST_WIDE_INT w
;
4633 const char *name
= (orig_name
4634 ? identifier_to_locale (IDENTIFIER_POINTER (orig_name
))
4635 : _("<anonymous>"));
4637 /* Detect and ignore out of range field width and process valid
4639 if (!INTEGRAL_TYPE_P (TREE_TYPE (*width
)))
4641 error ("bit-field %qs width not an integer constant", name
);
4642 *width
= integer_one_node
;
4646 if (TREE_CODE (*width
) != INTEGER_CST
)
4648 *width
= c_fully_fold (*width
, false, NULL
);
4649 if (TREE_CODE (*width
) == INTEGER_CST
)
4650 pedwarn (input_location
, OPT_pedantic
,
4651 "bit-field %qs width not an integer constant expression",
4654 if (TREE_CODE (*width
) != INTEGER_CST
)
4656 error ("bit-field %qs width not an integer constant", name
);
4657 *width
= integer_one_node
;
4659 constant_expression_warning (*width
);
4660 if (tree_int_cst_sgn (*width
) < 0)
4662 error ("negative width in bit-field %qs", name
);
4663 *width
= integer_one_node
;
4665 else if (integer_zerop (*width
) && orig_name
)
4667 error ("zero width for bit-field %qs", name
);
4668 *width
= integer_one_node
;
4672 /* Detect invalid bit-field type. */
4673 if (TREE_CODE (*type
) != INTEGER_TYPE
4674 && TREE_CODE (*type
) != BOOLEAN_TYPE
4675 && TREE_CODE (*type
) != ENUMERAL_TYPE
)
4677 error ("bit-field %qs has invalid type", name
);
4678 *type
= unsigned_type_node
;
4681 type_mv
= TYPE_MAIN_VARIANT (*type
);
4682 if (!in_system_header
4683 && type_mv
!= integer_type_node
4684 && type_mv
!= unsigned_type_node
4685 && type_mv
!= boolean_type_node
)
4686 pedwarn (input_location
, OPT_pedantic
,
4687 "type of bit-field %qs is a GCC extension", name
);
4689 max_width
= TYPE_PRECISION (*type
);
4691 if (0 < compare_tree_int (*width
, max_width
))
4693 error ("width of %qs exceeds its type", name
);
4695 *width
= build_int_cst (NULL_TREE
, w
);
4698 w
= tree_low_cst (*width
, 1);
4700 if (TREE_CODE (*type
) == ENUMERAL_TYPE
)
4702 struct lang_type
*lt
= TYPE_LANG_SPECIFIC (*type
);
4704 || w
< tree_int_cst_min_precision (lt
->enum_min
, TYPE_UNSIGNED (*type
))
4705 || w
< tree_int_cst_min_precision (lt
->enum_max
, TYPE_UNSIGNED (*type
)))
4706 warning (0, "%qs is narrower than values of its type", name
);
4712 /* Print warning about variable length array if necessary. */
4715 warn_variable_length_array (tree name
, tree size
)
4717 int const_size
= TREE_CONSTANT (size
);
4719 if (!flag_isoc99
&& pedantic
&& warn_vla
!= 0)
4724 pedwarn (input_location
, OPT_Wvla
,
4725 "ISO C90 forbids array %qE whose size "
4726 "can%'t be evaluated",
4729 pedwarn (input_location
, OPT_Wvla
, "ISO C90 forbids array whose size "
4730 "can%'t be evaluated");
4735 pedwarn (input_location
, OPT_Wvla
,
4736 "ISO C90 forbids variable length array %qE",
4739 pedwarn (input_location
, OPT_Wvla
, "ISO C90 forbids variable length array");
4742 else if (warn_vla
> 0)
4748 "the size of array %qE can"
4749 "%'t be evaluated", name
);
4752 "the size of array can %'t be evaluated");
4758 "variable length array %qE is used",
4762 "variable length array is used");
4767 /* Given a size SIZE that may not be a constant, return a SAVE_EXPR to
4768 serve as the actual size-expression for a type or decl. This is
4769 like variable_size in stor-layout.c, but we make global_bindings_p
4770 return negative to avoid calls to that function from outside the
4771 front end resulting in errors at file scope, then call this version
4772 instead from front-end code. */
4775 c_variable_size (tree size
)
4779 if (TREE_CONSTANT (size
))
4782 size
= save_expr (size
);
4784 save
= skip_simple_arithmetic (size
);
4786 if (cfun
&& cfun
->dont_save_pending_sizes_p
)
4789 if (!global_bindings_p ())
4790 put_pending_size (save
);
4795 /* Given declspecs and a declarator,
4796 determine the name and type of the object declared
4797 and construct a ..._DECL node for it.
4798 (In one case we can return a ..._TYPE node instead.
4799 For invalid input we sometimes return 0.)
4801 DECLSPECS is a c_declspecs structure for the declaration specifiers.
4803 DECL_CONTEXT says which syntactic context this declaration is in:
4804 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
4805 FUNCDEF for a function definition. Like NORMAL but a few different
4806 error messages in each case. Return value may be zero meaning
4807 this definition is too screwy to try to parse.
4808 PARM for a parameter declaration (either within a function prototype
4809 or before a function body). Make a PARM_DECL, or return void_type_node.
4810 TYPENAME if for a typename (in a cast or sizeof).
4811 Don't make a DECL node; just return the ..._TYPE node.
4812 FIELD for a struct or union field; make a FIELD_DECL.
4813 INITIALIZED is true if the decl has an initializer.
4814 WIDTH is non-NULL for bit-fields, and is a pointer to an INTEGER_CST node
4815 representing the width of the bit-field.
4816 DECL_ATTRS points to the list of attributes that should be added to this
4817 decl. Any nested attributes that belong on the decl itself will be
4819 If EXPR is not NULL, any expressions that need to be evaluated as
4820 part of evaluating variably modified types will be stored in *EXPR.
4821 If EXPR_CONST_OPERANDS is not NULL, *EXPR_CONST_OPERANDS will be
4822 set to indicate whether operands in *EXPR can be used in constant
4824 DEPRECATED_STATE is a deprecated_states value indicating whether
4825 deprecation warnings should be suppressed.
4827 In the TYPENAME case, DECLARATOR is really an absolute declarator.
4828 It may also be so in the PARM case, for a prototype where the
4829 argument type is specified but not the name.
4831 This function is where the complicated C meanings of `static'
4832 and `extern' are interpreted. */
4835 grokdeclarator (const struct c_declarator
*declarator
,
4836 struct c_declspecs
*declspecs
,
4837 enum decl_context decl_context
, bool initialized
, tree
*width
,
4838 tree
*decl_attrs
, tree
*expr
, bool *expr_const_operands
,
4839 enum deprecated_states deprecated_state
)
4841 tree type
= declspecs
->type
;
4842 bool threadp
= declspecs
->thread_p
;
4843 enum c_storage_class storage_class
= declspecs
->storage_class
;
4847 int type_quals
= TYPE_UNQUALIFIED
;
4848 tree name
= NULL_TREE
;
4849 bool funcdef_flag
= false;
4850 bool funcdef_syntax
= false;
4851 bool size_varies
= false;
4852 tree decl_attr
= declspecs
->decl_attr
;
4853 int array_ptr_quals
= TYPE_UNQUALIFIED
;
4854 tree array_ptr_attrs
= NULL_TREE
;
4855 int array_parm_static
= 0;
4856 bool array_parm_vla_unspec_p
= false;
4857 tree returned_attrs
= NULL_TREE
;
4858 bool bitfield
= width
!= NULL
;
4860 struct c_arg_info
*arg_info
= 0;
4861 addr_space_t as1
, as2
, address_space
;
4862 location_t loc
= UNKNOWN_LOCATION
;
4865 bool expr_const_operands_dummy
;
4869 if (expr_const_operands
== NULL
)
4870 expr_const_operands
= &expr_const_operands_dummy
;
4872 *expr
= declspecs
->expr
;
4873 *expr_const_operands
= declspecs
->expr_const_operands
;
4875 if (decl_context
== FUNCDEF
)
4876 funcdef_flag
= true, decl_context
= NORMAL
;
4878 /* Look inside a declarator for the name being declared
4879 and get it as an IDENTIFIER_NODE, for an error message. */
4881 const struct c_declarator
*decl
= declarator
;
4892 funcdef_syntax
= (decl
->kind
== cdk_function
);
4893 decl
= decl
->declarator
;
4897 decl
= decl
->declarator
;
4912 gcc_assert (decl_context
== PARM
4913 || decl_context
== TYPENAME
4914 || (decl_context
== FIELD
4915 && declarator
->kind
== cdk_id
));
4916 gcc_assert (!initialized
);
4920 /* A function definition's declarator must have the form of
4921 a function declarator. */
4923 if (funcdef_flag
&& !funcdef_syntax
)
4926 /* If this looks like a function definition, make it one,
4927 even if it occurs where parms are expected.
4928 Then store_parm_decls will reject it and not use it as a parm. */
4929 if (decl_context
== NORMAL
&& !funcdef_flag
&& current_scope
->parm_flag
)
4930 decl_context
= PARM
;
4932 if (declspecs
->deprecated_p
&& deprecated_state
!= DEPRECATED_SUPPRESS
)
4933 warn_deprecated_use (declspecs
->type
, declspecs
->decl_attr
);
4935 if ((decl_context
== NORMAL
|| decl_context
== FIELD
)
4936 && current_scope
== file_scope
4937 && variably_modified_type_p (type
, NULL_TREE
))
4940 error_at (loc
, "variably modified %qE at file scope", name
);
4942 error_at (loc
, "variably modified field at file scope");
4943 type
= integer_type_node
;
4946 size_varies
= C_TYPE_VARIABLE_SIZE (type
) != 0;
4948 /* Diagnose defaulting to "int". */
4950 if (declspecs
->default_int_p
&& !in_system_header
)
4952 /* Issue a warning if this is an ISO C 99 program or if
4953 -Wreturn-type and this is a function, or if -Wimplicit;
4954 prefer the former warning since it is more explicit. */
4955 if ((warn_implicit_int
|| warn_return_type
|| flag_isoc99
)
4957 warn_about_return_type
= 1;
4961 pedwarn_c99 (loc
, flag_isoc99
? 0 : OPT_Wimplicit_int
,
4962 "type defaults to %<int%> in declaration of %qE",
4965 pedwarn_c99 (input_location
, flag_isoc99
? 0 : OPT_Wimplicit_int
,
4966 "type defaults to %<int%> in type name");
4970 /* Adjust the type if a bit-field is being declared,
4971 -funsigned-bitfields applied and the type is not explicitly
4973 if (bitfield
&& !flag_signed_bitfields
&& !declspecs
->explicit_signed_p
4974 && TREE_CODE (type
) == INTEGER_TYPE
)
4975 type
= unsigned_type_for (type
);
4977 /* Figure out the type qualifiers for the declaration. There are
4978 two ways a declaration can become qualified. One is something
4979 like `const int i' where the `const' is explicit. Another is
4980 something like `typedef const int CI; CI i' where the type of the
4981 declaration contains the `const'. A third possibility is that
4982 there is a type qualifier on the element type of a typedefed
4983 array type, in which case we should extract that qualifier so
4984 that c_apply_type_quals_to_decl receives the full list of
4985 qualifiers to work with (C90 is not entirely clear about whether
4986 duplicate qualifiers should be diagnosed in this case, but it
4987 seems most appropriate to do so). */
4988 element_type
= strip_array_types (type
);
4989 constp
= declspecs
->const_p
+ TYPE_READONLY (element_type
);
4990 restrictp
= declspecs
->restrict_p
+ TYPE_RESTRICT (element_type
);
4991 volatilep
= declspecs
->volatile_p
+ TYPE_VOLATILE (element_type
);
4992 as1
= declspecs
->address_space
;
4993 as2
= TYPE_ADDR_SPACE (element_type
);
4994 address_space
= ADDR_SPACE_GENERIC_P (as1
)? as2
: as1
;
4996 if (pedantic
&& !flag_isoc99
)
4999 pedwarn (loc
, OPT_pedantic
, "duplicate %<const%>");
5001 pedwarn (loc
, OPT_pedantic
, "duplicate %<restrict%>");
5003 pedwarn (loc
, OPT_pedantic
, "duplicate %<volatile%>");
5006 if (!ADDR_SPACE_GENERIC_P (as1
) && !ADDR_SPACE_GENERIC_P (as2
) && as1
!= as2
)
5007 error_at (loc
, "conflicting named address spaces (%s vs %s)",
5008 c_addr_space_name (as1
), c_addr_space_name (as2
));
5010 if (!flag_gen_aux_info
&& (TYPE_QUALS (element_type
)))
5011 type
= TYPE_MAIN_VARIANT (type
);
5012 type_quals
= ((constp
? TYPE_QUAL_CONST
: 0)
5013 | (restrictp
? TYPE_QUAL_RESTRICT
: 0)
5014 | (volatilep
? TYPE_QUAL_VOLATILE
: 0)
5015 | ENCODE_QUAL_ADDR_SPACE (address_space
));
5017 /* Warn about storage classes that are invalid for certain
5018 kinds of declarations (parameters, typenames, etc.). */
5022 || storage_class
== csc_auto
5023 || storage_class
== csc_register
5024 || storage_class
== csc_typedef
))
5026 if (storage_class
== csc_auto
)
5028 (current_scope
== file_scope
) ? 0 : OPT_pedantic
,
5029 "function definition declared %<auto%>");
5030 if (storage_class
== csc_register
)
5031 error_at (loc
, "function definition declared %<register%>");
5032 if (storage_class
== csc_typedef
)
5033 error_at (loc
, "function definition declared %<typedef%>");
5035 error_at (loc
, "function definition declared %<__thread%>");
5037 if (storage_class
== csc_auto
5038 || storage_class
== csc_register
5039 || storage_class
== csc_typedef
)
5040 storage_class
= csc_none
;
5042 else if (decl_context
!= NORMAL
&& (storage_class
!= csc_none
|| threadp
))
5044 if (decl_context
== PARM
&& storage_class
== csc_register
)
5048 switch (decl_context
)
5052 error_at (loc
, "storage class specified for structure "
5055 error_at (loc
, "storage class specified for structure field");
5059 error_at (loc
, "storage class specified for parameter %qE",
5062 error_at (loc
, "storage class specified for unnamed parameter");
5065 error_at (loc
, "storage class specified for typename");
5068 storage_class
= csc_none
;
5072 else if (storage_class
== csc_extern
5076 /* 'extern' with initialization is invalid if not at file scope. */
5077 if (current_scope
== file_scope
)
5079 /* It is fine to have 'extern const' when compiling at C
5080 and C++ intersection. */
5081 if (!(warn_cxx_compat
&& constp
))
5082 warning_at (loc
, 0, "%qE initialized and declared %<extern%>",
5086 error_at (loc
, "%qE has both %<extern%> and initializer", name
);
5088 else if (current_scope
== file_scope
)
5090 if (storage_class
== csc_auto
)
5091 error_at (loc
, "file-scope declaration of %qE specifies %<auto%>",
5093 if (pedantic
&& storage_class
== csc_register
)
5094 pedwarn (input_location
, OPT_pedantic
,
5095 "file-scope declaration of %qE specifies %<register%>", name
);
5099 if (storage_class
== csc_extern
&& funcdef_flag
)
5100 error_at (loc
, "nested function %qE declared %<extern%>", name
);
5101 else if (threadp
&& storage_class
== csc_none
)
5103 error_at (loc
, "function-scope %qE implicitly auto and declared "
5110 /* Now figure out the structure of the declarator proper.
5111 Descend through it, creating more complex types, until we reach
5112 the declared identifier (or NULL_TREE, in an absolute declarator).
5113 At each stage we maintain an unqualified version of the type
5114 together with any qualifiers that should be applied to it with
5115 c_build_qualified_type; this way, array types including
5116 multidimensional array types are first built up in unqualified
5117 form and then the qualified form is created with
5118 TYPE_MAIN_VARIANT pointing to the unqualified form. */
5120 while (declarator
&& declarator
->kind
!= cdk_id
)
5122 if (type
== error_mark_node
)
5124 declarator
= declarator
->declarator
;
5128 /* Each level of DECLARATOR is either a cdk_array (for ...[..]),
5129 a cdk_pointer (for *...),
5130 a cdk_function (for ...(...)),
5131 a cdk_attrs (for nested attributes),
5132 or a cdk_id (for the name being declared
5133 or the place in an absolute declarator
5134 where the name was omitted).
5135 For the last case, we have just exited the loop.
5137 At this point, TYPE is the type of elements of an array,
5138 or for a function to return, or for a pointer to point to.
5139 After this sequence of ifs, TYPE is the type of the
5140 array or function or pointer, and DECLARATOR has had its
5141 outermost layer removed. */
5143 if (array_ptr_quals
!= TYPE_UNQUALIFIED
5144 || array_ptr_attrs
!= NULL_TREE
5145 || array_parm_static
)
5147 /* Only the innermost declarator (making a parameter be of
5148 array type which is converted to pointer type)
5149 may have static or type qualifiers. */
5150 error_at (loc
, "static or type qualifiers in non-parameter array declarator");
5151 array_ptr_quals
= TYPE_UNQUALIFIED
;
5152 array_ptr_attrs
= NULL_TREE
;
5153 array_parm_static
= 0;
5156 switch (declarator
->kind
)
5160 /* A declarator with embedded attributes. */
5161 tree attrs
= declarator
->u
.attrs
;
5162 const struct c_declarator
*inner_decl
;
5164 declarator
= declarator
->declarator
;
5165 inner_decl
= declarator
;
5166 while (inner_decl
->kind
== cdk_attrs
)
5167 inner_decl
= inner_decl
->declarator
;
5168 if (inner_decl
->kind
== cdk_id
)
5169 attr_flags
|= (int) ATTR_FLAG_DECL_NEXT
;
5170 else if (inner_decl
->kind
== cdk_function
)
5171 attr_flags
|= (int) ATTR_FLAG_FUNCTION_NEXT
;
5172 else if (inner_decl
->kind
== cdk_array
)
5173 attr_flags
|= (int) ATTR_FLAG_ARRAY_NEXT
;
5174 returned_attrs
= decl_attributes (&type
,
5175 chainon (returned_attrs
, attrs
),
5181 tree itype
= NULL_TREE
;
5182 tree size
= declarator
->u
.array
.dimen
;
5183 /* The index is a signed object `sizetype' bits wide. */
5184 tree index_type
= c_common_signed_type (sizetype
);
5186 array_ptr_quals
= declarator
->u
.array
.quals
;
5187 array_ptr_attrs
= declarator
->u
.array
.attrs
;
5188 array_parm_static
= declarator
->u
.array
.static_p
;
5189 array_parm_vla_unspec_p
= declarator
->u
.array
.vla_unspec_p
;
5191 declarator
= declarator
->declarator
;
5193 /* Check for some types that there cannot be arrays of. */
5195 if (VOID_TYPE_P (type
))
5198 error_at (loc
, "declaration of %qE as array of voids", name
);
5200 error_at (loc
, "declaration of type name as array of voids");
5201 type
= error_mark_node
;
5204 if (TREE_CODE (type
) == FUNCTION_TYPE
)
5207 error_at (loc
, "declaration of %qE as array of functions",
5210 error_at (loc
, "declaration of type name as array of "
5212 type
= error_mark_node
;
5215 if (pedantic
&& !in_system_header
&& flexible_array_type_p (type
))
5216 pedwarn (loc
, OPT_pedantic
,
5217 "invalid use of structure with flexible array member");
5219 if (size
== error_mark_node
)
5220 type
= error_mark_node
;
5222 if (type
== error_mark_node
)
5225 /* If size was specified, set ITYPE to a range-type for
5226 that size. Otherwise, ITYPE remains null. finish_decl
5227 may figure it out from an initial value. */
5231 bool size_maybe_const
= true;
5232 bool size_int_const
= (TREE_CODE (size
) == INTEGER_CST
5233 && !TREE_OVERFLOW (size
));
5234 bool this_size_varies
= false;
5236 /* Strip NON_LVALUE_EXPRs since we aren't using as an
5238 STRIP_TYPE_NOPS (size
);
5240 if (!INTEGRAL_TYPE_P (TREE_TYPE (size
)))
5243 error_at (loc
, "size of array %qE has non-integer type",
5247 "size of unnamed array has non-integer type");
5248 size
= integer_one_node
;
5251 size
= c_fully_fold (size
, false, &size_maybe_const
);
5253 if (pedantic
&& size_maybe_const
&& integer_zerop (size
))
5256 pedwarn (loc
, OPT_pedantic
,
5257 "ISO C forbids zero-size array %qE", name
);
5259 pedwarn (loc
, OPT_pedantic
,
5260 "ISO C forbids zero-size array");
5263 if (TREE_CODE (size
) == INTEGER_CST
&& size_maybe_const
)
5265 constant_expression_warning (size
);
5266 if (tree_int_cst_sgn (size
) < 0)
5269 error_at (loc
, "size of array %qE is negative", name
);
5271 error_at (loc
, "size of unnamed array is negative");
5272 size
= integer_one_node
;
5274 /* Handle a size folded to an integer constant but
5275 not an integer constant expression. */
5276 if (!size_int_const
)
5278 /* If this is a file scope declaration of an
5279 ordinary identifier, this is invalid code;
5280 diagnosing it here and not subsequently
5281 treating the type as variable-length avoids
5282 more confusing diagnostics later. */
5283 if ((decl_context
== NORMAL
|| decl_context
== FIELD
)
5284 && current_scope
== file_scope
)
5285 pedwarn (input_location
, 0,
5286 "variably modified %qE at file scope",
5289 this_size_varies
= size_varies
= true;
5290 warn_variable_length_array (name
, size
);
5293 else if ((decl_context
== NORMAL
|| decl_context
== FIELD
)
5294 && current_scope
== file_scope
)
5296 error_at (loc
, "variably modified %qE at file scope", name
);
5297 size
= integer_one_node
;
5301 /* Make sure the array size remains visibly
5302 nonconstant even if it is (eg) a const variable
5303 with known value. */
5304 this_size_varies
= size_varies
= true;
5305 warn_variable_length_array (name
, size
);
5308 if (integer_zerop (size
) && !this_size_varies
)
5310 /* A zero-length array cannot be represented with
5311 an unsigned index type, which is what we'll
5312 get with build_index_type. Create an
5313 open-ended range instead. */
5314 itype
= build_range_type (sizetype
, size
, NULL_TREE
);
5318 /* Arrange for the SAVE_EXPR on the inside of the
5319 MINUS_EXPR, which allows the -1 to get folded
5320 with the +1 that happens when building TYPE_SIZE. */
5322 size
= c_variable_size (size
);
5323 if (this_size_varies
&& TREE_CODE (size
) == INTEGER_CST
)
5324 size
= build2 (COMPOUND_EXPR
, TREE_TYPE (size
),
5325 integer_zero_node
, size
);
5327 /* Compute the maximum valid index, that is, size
5328 - 1. Do the calculation in index_type, so that
5329 if it is a variable the computations will be
5330 done in the proper mode. */
5331 itype
= fold_build2_loc (loc
, MINUS_EXPR
, index_type
,
5332 convert (index_type
, size
),
5333 convert (index_type
,
5336 /* If that overflowed, the array is too big. ???
5337 While a size of INT_MAX+1 technically shouldn't
5338 cause an overflow (because we subtract 1), the
5339 overflow is recorded during the conversion to
5340 index_type, before the subtraction. Handling
5341 this case seems like an unnecessary
5343 if (TREE_CODE (itype
) == INTEGER_CST
5344 && TREE_OVERFLOW (itype
))
5347 error_at (loc
, "size of array %qE is too large",
5350 error_at (loc
, "size of unnamed array is too large");
5351 type
= error_mark_node
;
5355 itype
= build_index_type (itype
);
5357 if (this_size_varies
)
5360 *expr
= build2 (COMPOUND_EXPR
, TREE_TYPE (size
),
5364 *expr_const_operands
&= size_maybe_const
;
5367 else if (decl_context
== FIELD
)
5369 bool flexible_array_member
= false;
5370 if (array_parm_vla_unspec_p
)
5371 /* Field names can in fact have function prototype
5372 scope so [*] is disallowed here through making
5373 the field variably modified, not through being
5374 something other than a declaration with function
5379 const struct c_declarator
*t
= declarator
;
5380 while (t
->kind
== cdk_attrs
)
5382 flexible_array_member
= (t
->kind
== cdk_id
);
5384 if (flexible_array_member
5385 && pedantic
&& !flag_isoc99
&& !in_system_header
)
5386 pedwarn (loc
, OPT_pedantic
,
5387 "ISO C90 does not support flexible array members");
5389 /* ISO C99 Flexible array members are effectively
5390 identical to GCC's zero-length array extension. */
5391 if (flexible_array_member
|| array_parm_vla_unspec_p
)
5392 itype
= build_range_type (sizetype
, size_zero_node
,
5395 else if (decl_context
== PARM
)
5397 if (array_parm_vla_unspec_p
)
5399 itype
= build_range_type (sizetype
, size_zero_node
, NULL_TREE
);
5403 else if (decl_context
== TYPENAME
)
5405 if (array_parm_vla_unspec_p
)
5408 warning (0, "%<[*]%> not in a declaration");
5409 /* We use this to avoid messing up with incomplete
5410 array types of the same type, that would
5411 otherwise be modified below. */
5412 itype
= build_range_type (sizetype
, size_zero_node
,
5418 /* Complain about arrays of incomplete types. */
5419 if (!COMPLETE_TYPE_P (type
))
5421 error_at (loc
, "array type has incomplete element type");
5422 type
= error_mark_node
;
5425 /* When itype is NULL, a shared incomplete array type is
5426 returned for all array of a given type. Elsewhere we
5427 make sure we don't complete that type before copying
5428 it, but here we want to make sure we don't ever
5429 modify the shared type, so we gcc_assert (itype)
5432 addr_space_t as
= DECODE_QUAL_ADDR_SPACE (type_quals
);
5433 if (!ADDR_SPACE_GENERIC_P (as
) && as
!= TYPE_ADDR_SPACE (type
))
5434 type
= build_qualified_type (type
,
5435 ENCODE_QUAL_ADDR_SPACE (as
));
5437 type
= build_array_type (type
, itype
);
5440 if (type
!= error_mark_node
)
5444 /* It is ok to modify type here even if itype is
5445 NULL: if size_varies, we're in a
5446 multi-dimensional array and the inner type has
5447 variable size, so the enclosing shared array type
5449 if (size
&& TREE_CODE (size
) == INTEGER_CST
)
5451 = build_distinct_type_copy (TYPE_MAIN_VARIANT (type
));
5452 C_TYPE_VARIABLE_SIZE (type
) = 1;
5455 /* The GCC extension for zero-length arrays differs from
5456 ISO flexible array members in that sizeof yields
5458 if (size
&& integer_zerop (size
))
5461 TYPE_SIZE (type
) = bitsize_zero_node
;
5462 TYPE_SIZE_UNIT (type
) = size_zero_node
;
5463 SET_TYPE_STRUCTURAL_EQUALITY (type
);
5465 if (array_parm_vla_unspec_p
)
5468 /* The type is complete. C99 6.7.5.2p4 */
5469 TYPE_SIZE (type
) = bitsize_zero_node
;
5470 TYPE_SIZE_UNIT (type
) = size_zero_node
;
5471 SET_TYPE_STRUCTURAL_EQUALITY (type
);
5475 if (decl_context
!= PARM
5476 && (array_ptr_quals
!= TYPE_UNQUALIFIED
5477 || array_ptr_attrs
!= NULL_TREE
5478 || array_parm_static
))
5480 error_at (loc
, "static or type qualifiers in non-parameter array declarator");
5481 array_ptr_quals
= TYPE_UNQUALIFIED
;
5482 array_ptr_attrs
= NULL_TREE
;
5483 array_parm_static
= 0;
5489 /* Say it's a definition only for the declarator closest
5490 to the identifier, apart possibly from some
5492 bool really_funcdef
= false;
5496 const struct c_declarator
*t
= declarator
->declarator
;
5497 while (t
->kind
== cdk_attrs
)
5499 really_funcdef
= (t
->kind
== cdk_id
);
5502 /* Declaring a function type. Make sure we have a valid
5503 type for the function to return. */
5504 if (type
== error_mark_node
)
5507 size_varies
= false;
5509 /* Warn about some types functions can't return. */
5510 if (TREE_CODE (type
) == FUNCTION_TYPE
)
5513 error_at (loc
, "%qE declared as function returning a "
5516 error_at (loc
, "type name declared as function "
5517 "returning a function");
5518 type
= integer_type_node
;
5520 if (TREE_CODE (type
) == ARRAY_TYPE
)
5523 error_at (loc
, "%qE declared as function returning an array",
5526 error_at (loc
, "type name declared as function returning "
5528 type
= integer_type_node
;
5530 errmsg
= targetm
.invalid_return_type (type
);
5534 type
= integer_type_node
;
5537 /* Construct the function type and go to the next
5538 inner layer of declarator. */
5539 arg_info
= declarator
->u
.arg_info
;
5540 arg_types
= grokparms (arg_info
, really_funcdef
);
5542 put_pending_sizes (arg_info
->pending_sizes
);
5544 /* Type qualifiers before the return type of the function
5545 qualify the return type, not the function type. */
5548 /* Type qualifiers on a function return type are
5549 normally permitted by the standard but have no
5550 effect, so give a warning at -Wreturn-type.
5551 Qualifiers on a void return type are banned on
5552 function definitions in ISO C; GCC used to used
5553 them for noreturn functions. */
5554 if (VOID_TYPE_P (type
) && really_funcdef
)
5556 "function definition has qualified void return type");
5558 warning_at (loc
, OPT_Wignored_qualifiers
,
5559 "type qualifiers ignored on function return type");
5561 type
= c_build_qualified_type (type
, type_quals
);
5563 type_quals
= TYPE_UNQUALIFIED
;
5565 type
= build_function_type (type
, arg_types
);
5566 declarator
= declarator
->declarator
;
5568 /* Set the TYPE_CONTEXTs for each tagged type which is local to
5569 the formal parameter list of this FUNCTION_TYPE to point to
5570 the FUNCTION_TYPE node itself. */
5575 FOR_EACH_VEC_ELT_REVERSE (c_arg_tag
, arg_info
->tags
, ix
, tag
)
5576 TYPE_CONTEXT (tag
->type
) = type
;
5582 /* Merge any constancy or volatility into the target type
5585 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
5587 pedwarn (loc
, OPT_pedantic
,
5588 "ISO C forbids qualified function types");
5590 type
= c_build_qualified_type (type
, type_quals
);
5591 size_varies
= false;
5593 /* When the pointed-to type involves components of variable size,
5594 care must be taken to ensure that the size evaluation code is
5595 emitted early enough to dominate all the possible later uses
5596 and late enough for the variables on which it depends to have
5599 This is expected to happen automatically when the pointed-to
5600 type has a name/declaration of it's own, but special attention
5601 is required if the type is anonymous.
5603 We handle the NORMAL and FIELD contexts here by attaching an
5604 artificial TYPE_DECL to such pointed-to type. This forces the
5605 sizes evaluation at a safe point and ensures it is not deferred
5606 until e.g. within a deeper conditional context.
5608 We expect nothing to be needed here for PARM or TYPENAME.
5609 Pushing a TYPE_DECL at this point for TYPENAME would actually
5610 be incorrect, as we might be in the middle of an expression
5611 with side effects on the pointed-to type size "arguments" prior
5612 to the pointer declaration point and the fake TYPE_DECL in the
5613 enclosing context would force the size evaluation prior to the
5616 if (!TYPE_NAME (type
)
5617 && (decl_context
== NORMAL
|| decl_context
== FIELD
)
5618 && variably_modified_type_p (type
, NULL_TREE
))
5620 tree decl
= build_decl (loc
, TYPE_DECL
, NULL_TREE
, type
);
5621 DECL_ARTIFICIAL (decl
) = 1;
5623 finish_decl (decl
, loc
, NULL_TREE
, NULL_TREE
, NULL_TREE
);
5624 TYPE_NAME (type
) = decl
;
5627 type
= build_pointer_type (type
);
5629 /* Process type qualifiers (such as const or volatile)
5630 that were given inside the `*'. */
5631 type_quals
= declarator
->u
.pointer_quals
;
5633 declarator
= declarator
->declarator
;
5640 *decl_attrs
= chainon (returned_attrs
, *decl_attrs
);
5642 /* Now TYPE has the actual type, apart from any qualifiers in
5645 /* Warn about address space used for things other than static memory or
5647 address_space
= DECODE_QUAL_ADDR_SPACE (type_quals
);
5648 if (!ADDR_SPACE_GENERIC_P (address_space
))
5650 if (decl_context
== NORMAL
)
5652 switch (storage_class
)
5655 error ("%qs combined with %<auto%> qualifier for %qE",
5656 c_addr_space_name (address_space
), name
);
5659 error ("%qs combined with %<register%> qualifier for %qE",
5660 c_addr_space_name (address_space
), name
);
5663 if (current_function_scope
)
5665 error ("%qs specified for auto variable %qE",
5666 c_addr_space_name (address_space
), name
);
5678 else if (decl_context
== PARM
&& TREE_CODE (type
) != ARRAY_TYPE
)
5681 error ("%qs specified for parameter %qE",
5682 c_addr_space_name (address_space
), name
);
5684 error ("%qs specified for unnamed parameter",
5685 c_addr_space_name (address_space
));
5687 else if (decl_context
== FIELD
)
5690 error ("%qs specified for structure field %qE",
5691 c_addr_space_name (address_space
), name
);
5693 error ("%qs specified for structure field",
5694 c_addr_space_name (address_space
));
5698 /* Check the type and width of a bit-field. */
5700 check_bitfield_type_and_width (&type
, width
, name
);
5702 /* Did array size calculations overflow? */
5704 if (TREE_CODE (type
) == ARRAY_TYPE
5705 && COMPLETE_TYPE_P (type
)
5706 && TREE_CODE (TYPE_SIZE_UNIT (type
)) == INTEGER_CST
5707 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type
)))
5710 error_at (loc
, "size of array %qE is too large", name
);
5712 error_at (loc
, "size of unnamed array is too large");
5713 /* If we proceed with the array type as it is, we'll eventually
5714 crash in tree_low_cst(). */
5715 type
= error_mark_node
;
5718 /* If this is declaring a typedef name, return a TYPE_DECL. */
5720 if (storage_class
== csc_typedef
)
5723 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
5725 pedwarn (loc
, OPT_pedantic
,
5726 "ISO C forbids qualified function types");
5728 type
= c_build_qualified_type (type
, type_quals
);
5729 decl
= build_decl (declarator
->id_loc
,
5730 TYPE_DECL
, declarator
->u
.id
, type
);
5731 if (declspecs
->explicit_signed_p
)
5732 C_TYPEDEF_EXPLICITLY_SIGNED (decl
) = 1;
5733 if (declspecs
->inline_p
)
5734 pedwarn (loc
, 0,"typedef %q+D declared %<inline%>", decl
);
5736 if (warn_cxx_compat
&& declarator
->u
.id
!= NULL_TREE
)
5738 struct c_binding
*b
= I_TAG_BINDING (declarator
->u
.id
);
5741 && b
->decl
!= NULL_TREE
5742 && (B_IN_CURRENT_SCOPE (b
)
5743 || (current_scope
== file_scope
&& B_IN_EXTERNAL_SCOPE (b
)))
5744 && TYPE_MAIN_VARIANT (b
->decl
) != TYPE_MAIN_VARIANT (type
))
5746 warning_at (declarator
->id_loc
, OPT_Wc___compat
,
5747 ("using %qD as both a typedef and a tag is "
5750 if (b
->locus
!= UNKNOWN_LOCATION
)
5751 inform (b
->locus
, "originally defined here");
5758 /* If this is a type name (such as, in a cast or sizeof),
5759 compute the type and return it now. */
5761 if (decl_context
== TYPENAME
)
5763 /* Note that the grammar rejects storage classes in typenames
5765 gcc_assert (storage_class
== csc_none
&& !threadp
5766 && !declspecs
->inline_p
);
5767 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
5769 pedwarn (loc
, OPT_pedantic
,
5770 "ISO C forbids const or volatile function types");
5772 type
= c_build_qualified_type (type
, type_quals
);
5776 if (pedantic
&& decl_context
== FIELD
5777 && variably_modified_type_p (type
, NULL_TREE
))
5780 pedwarn (loc
, OPT_pedantic
, "a member of a structure or union cannot "
5781 "have a variably modified type");
5784 /* Aside from typedefs and type names (handle above),
5785 `void' at top level (not within pointer)
5786 is allowed only in public variables.
5787 We don't complain about parms either, but that is because
5788 a better error message can be made later. */
5790 if (VOID_TYPE_P (type
) && decl_context
!= PARM
5791 && !((decl_context
!= FIELD
&& TREE_CODE (type
) != FUNCTION_TYPE
)
5792 && (storage_class
== csc_extern
5793 || (current_scope
== file_scope
5794 && !(storage_class
== csc_static
5795 || storage_class
== csc_register
)))))
5797 error_at (loc
, "variable or field %qE declared void", name
);
5798 type
= integer_type_node
;
5801 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
5802 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
5807 if (decl_context
== PARM
)
5811 /* A parameter declared as an array of T is really a pointer to T.
5812 One declared as a function is really a pointer to a function. */
5814 if (TREE_CODE (type
) == ARRAY_TYPE
)
5816 /* Transfer const-ness of array into that of type pointed to. */
5817 type
= TREE_TYPE (type
);
5819 type
= c_build_qualified_type (type
, type_quals
);
5820 type
= build_pointer_type (type
);
5821 type_quals
= array_ptr_quals
;
5823 type
= c_build_qualified_type (type
, type_quals
);
5825 /* We don't yet implement attributes in this context. */
5826 if (array_ptr_attrs
!= NULL_TREE
)
5827 warning_at (loc
, OPT_Wattributes
,
5828 "attributes in parameter array declarator ignored");
5830 size_varies
= false;
5832 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
5835 pedwarn (loc
, OPT_pedantic
,
5836 "ISO C forbids qualified function types");
5838 type
= c_build_qualified_type (type
, type_quals
);
5839 type
= build_pointer_type (type
);
5840 type_quals
= TYPE_UNQUALIFIED
;
5842 else if (type_quals
)
5843 type
= c_build_qualified_type (type
, type_quals
);
5845 decl
= build_decl (declarator
->id_loc
,
5846 PARM_DECL
, declarator
->u
.id
, type
);
5848 C_DECL_VARIABLE_SIZE (decl
) = 1;
5850 /* Compute the type actually passed in the parmlist,
5851 for the case where there is no prototype.
5852 (For example, shorts and chars are passed as ints.)
5853 When there is a prototype, this is overridden later. */
5855 if (type
== error_mark_node
)
5856 promoted_type
= type
;
5858 promoted_type
= c_type_promotes_to (type
);
5860 DECL_ARG_TYPE (decl
) = promoted_type
;
5861 if (declspecs
->inline_p
)
5862 pedwarn (loc
, 0, "parameter %q+D declared %<inline%>", decl
);
5864 else if (decl_context
== FIELD
)
5866 /* Note that the grammar rejects storage classes in typenames
5868 gcc_assert (storage_class
== csc_none
&& !threadp
5869 && !declspecs
->inline_p
);
5871 /* Structure field. It may not be a function. */
5873 if (TREE_CODE (type
) == FUNCTION_TYPE
)
5875 error_at (loc
, "field %qE declared as a function", name
);
5876 type
= build_pointer_type (type
);
5878 else if (TREE_CODE (type
) != ERROR_MARK
5879 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type
))
5882 error_at (loc
, "field %qE has incomplete type", name
);
5884 error_at (loc
, "unnamed field has incomplete type");
5885 type
= error_mark_node
;
5887 type
= c_build_qualified_type (type
, type_quals
);
5888 decl
= build_decl (declarator
->id_loc
,
5889 FIELD_DECL
, declarator
->u
.id
, type
);
5890 DECL_NONADDRESSABLE_P (decl
) = bitfield
;
5891 if (bitfield
&& !declarator
->u
.id
)
5892 TREE_NO_WARNING (decl
) = 1;
5895 C_DECL_VARIABLE_SIZE (decl
) = 1;
5897 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
5899 if (storage_class
== csc_register
|| threadp
)
5901 error_at (loc
, "invalid storage class for function %qE", name
);
5903 else if (current_scope
!= file_scope
)
5905 /* Function declaration not at file scope. Storage
5906 classes other than `extern' are not allowed, C99
5907 6.7.1p5, and `extern' makes no difference. However,
5908 GCC allows 'auto', perhaps with 'inline', to support
5909 nested functions. */
5910 if (storage_class
== csc_auto
)
5911 pedwarn (loc
, OPT_pedantic
,
5912 "invalid storage class for function %qE", name
);
5913 else if (storage_class
== csc_static
)
5915 error_at (loc
, "invalid storage class for function %qE", name
);
5917 storage_class
= declspecs
->storage_class
= csc_none
;
5923 decl
= build_decl (declarator
->id_loc
,
5924 FUNCTION_DECL
, declarator
->u
.id
, type
);
5925 decl
= build_decl_attribute_variant (decl
, decl_attr
);
5927 if (pedantic
&& type_quals
&& !DECL_IN_SYSTEM_HEADER (decl
))
5928 pedwarn (loc
, OPT_pedantic
,
5929 "ISO C forbids qualified function types");
5931 /* Every function declaration is an external reference
5932 (DECL_EXTERNAL) except for those which are not at file
5933 scope and are explicitly declared "auto". This is
5934 forbidden by standard C (C99 6.7.1p5) and is interpreted by
5935 GCC to signify a forward declaration of a nested function. */
5936 if (storage_class
== csc_auto
&& current_scope
!= file_scope
)
5937 DECL_EXTERNAL (decl
) = 0;
5938 /* In C99, a function which is declared 'inline' with 'extern'
5939 is not an external reference (which is confusing). It
5940 means that the later definition of the function must be output
5941 in this file, C99 6.7.4p6. In GNU C89, a function declared
5942 'extern inline' is an external reference. */
5943 else if (declspecs
->inline_p
&& storage_class
!= csc_static
)
5944 DECL_EXTERNAL (decl
) = ((storage_class
== csc_extern
)
5945 == flag_gnu89_inline
);
5947 DECL_EXTERNAL (decl
) = !initialized
;
5949 /* Record absence of global scope for `static' or `auto'. */
5951 = !(storage_class
== csc_static
|| storage_class
== csc_auto
);
5953 /* For a function definition, record the argument information
5954 block where store_parm_decls will look for it. */
5956 current_function_arg_info
= arg_info
;
5958 if (declspecs
->default_int_p
)
5959 C_FUNCTION_IMPLICIT_INT (decl
) = 1;
5961 /* Record presence of `inline', if it is reasonable. */
5962 if (flag_hosted
&& MAIN_NAME_P (declarator
->u
.id
))
5964 if (declspecs
->inline_p
)
5965 pedwarn (loc
, 0, "cannot inline function %<main%>");
5967 else if (declspecs
->inline_p
)
5968 /* Record that the function is declared `inline'. */
5969 DECL_DECLARED_INLINE_P (decl
) = 1;
5973 /* It's a variable. */
5974 /* An uninitialized decl with `extern' is a reference. */
5975 int extern_ref
= !initialized
&& storage_class
== csc_extern
;
5977 type
= c_build_qualified_type (type
, type_quals
);
5979 /* C99 6.2.2p7: It is invalid (compile-time undefined
5980 behavior) to create an 'extern' declaration for a
5981 variable if there is a global declaration that is
5982 'static' and the global declaration is not visible.
5983 (If the static declaration _is_ currently visible,
5984 the 'extern' declaration is taken to refer to that decl.) */
5985 if (extern_ref
&& current_scope
!= file_scope
)
5987 tree global_decl
= identifier_global_value (declarator
->u
.id
);
5988 tree visible_decl
= lookup_name (declarator
->u
.id
);
5991 && global_decl
!= visible_decl
5992 && TREE_CODE (global_decl
) == VAR_DECL
5993 && !TREE_PUBLIC (global_decl
))
5994 error_at (loc
, "variable previously declared %<static%> "
5995 "redeclared %<extern%>");
5998 decl
= build_decl (declarator
->id_loc
,
5999 VAR_DECL
, declarator
->u
.id
, type
);
6001 C_DECL_VARIABLE_SIZE (decl
) = 1;
6003 if (declspecs
->inline_p
)
6004 pedwarn (loc
, 0, "variable %q+D declared %<inline%>", decl
);
6006 /* At file scope, an initialized extern declaration may follow
6007 a static declaration. In that case, DECL_EXTERNAL will be
6008 reset later in start_decl. */
6009 DECL_EXTERNAL (decl
) = (storage_class
== csc_extern
);
6011 /* At file scope, the presence of a `static' or `register' storage
6012 class specifier, or the absence of all storage class specifiers
6013 makes this declaration a definition (perhaps tentative). Also,
6014 the absence of `static' makes it public. */
6015 if (current_scope
== file_scope
)
6017 TREE_PUBLIC (decl
) = storage_class
!= csc_static
;
6018 TREE_STATIC (decl
) = !extern_ref
;
6020 /* Not at file scope, only `static' makes a static definition. */
6023 TREE_STATIC (decl
) = (storage_class
== csc_static
);
6024 TREE_PUBLIC (decl
) = extern_ref
;
6028 DECL_TLS_MODEL (decl
) = decl_default_tls_model (decl
);
6031 if ((storage_class
== csc_extern
6032 || (storage_class
== csc_none
6033 && TREE_CODE (type
) == FUNCTION_TYPE
6035 && variably_modified_type_p (type
, NULL_TREE
))
6038 if (TREE_CODE (type
) == FUNCTION_TYPE
)
6039 error_at (loc
, "non-nested function with variably modified type");
6041 error_at (loc
, "object with variably modified type must have "
6045 /* Record `register' declaration for warnings on &
6046 and in case doing stupid register allocation. */
6048 if (storage_class
== csc_register
)
6050 C_DECL_REGISTER (decl
) = 1;
6051 DECL_REGISTER (decl
) = 1;
6054 /* Record constancy and volatility. */
6055 c_apply_type_quals_to_decl (type_quals
, decl
);
6057 /* If a type has volatile components, it should be stored in memory.
6058 Otherwise, the fact that those components are volatile
6059 will be ignored, and would even crash the compiler.
6060 Of course, this only makes sense on VAR,PARM, and RESULT decl's. */
6061 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl
))
6062 && (TREE_CODE (decl
) == VAR_DECL
|| TREE_CODE (decl
) == PARM_DECL
6063 || TREE_CODE (decl
) == RESULT_DECL
))
6065 /* It is not an error for a structure with volatile fields to
6066 be declared register, but reset DECL_REGISTER since it
6067 cannot actually go in a register. */
6068 int was_reg
= C_DECL_REGISTER (decl
);
6069 C_DECL_REGISTER (decl
) = 0;
6070 DECL_REGISTER (decl
) = 0;
6071 c_mark_addressable (decl
);
6072 C_DECL_REGISTER (decl
) = was_reg
;
6075 /* This is the earliest point at which we might know the assembler
6076 name of a variable. Thus, if it's known before this, die horribly. */
6077 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl
));
6080 && TREE_CODE (decl
) == VAR_DECL
6081 && TREE_PUBLIC (decl
)
6082 && TREE_STATIC (decl
)
6083 && (TREE_CODE (TREE_TYPE (decl
)) == RECORD_TYPE
6084 || TREE_CODE (TREE_TYPE (decl
)) == UNION_TYPE
6085 || TREE_CODE (TREE_TYPE (decl
)) == ENUMERAL_TYPE
)
6086 && TYPE_NAME (TREE_TYPE (decl
)) == NULL_TREE
)
6087 warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wc___compat
,
6088 ("non-local variable %qD with anonymous type is "
6089 "questionable in C++"),
6096 /* Decode the parameter-list info for a function type or function definition.
6097 The argument is the value returned by `get_parm_info' (or made in c-parse.c
6098 if there is an identifier list instead of a parameter decl list).
6099 These two functions are separate because when a function returns
6100 or receives functions then each is called multiple times but the order
6101 of calls is different. The last call to `grokparms' is always the one
6102 that contains the formal parameter names of a function definition.
6104 Return a list of arg types to use in the FUNCTION_TYPE for this function.
6106 FUNCDEF_FLAG is true for a function definition, false for
6107 a mere declaration. A nonempty identifier-list gets an error message
6108 when FUNCDEF_FLAG is false. */
6111 grokparms (struct c_arg_info
*arg_info
, bool funcdef_flag
)
6113 tree arg_types
= arg_info
->types
;
6115 if (funcdef_flag
&& arg_info
->had_vla_unspec
)
6117 /* A function definition isn't function prototype scope C99 6.2.1p4. */
6119 error ("%<[*]%> not allowed in other than function prototype scope");
6122 if (arg_types
== 0 && !funcdef_flag
&& !in_system_header
)
6123 warning (OPT_Wstrict_prototypes
,
6124 "function declaration isn%'t a prototype");
6126 if (arg_types
== error_mark_node
)
6127 return 0; /* don't set TYPE_ARG_TYPES in this case */
6129 else if (arg_types
&& TREE_CODE (TREE_VALUE (arg_types
)) == IDENTIFIER_NODE
)
6132 pedwarn (input_location
, 0, "parameter names (without types) in function declaration");
6134 arg_info
->parms
= arg_info
->types
;
6135 arg_info
->types
= 0;
6140 tree parm
, type
, typelt
;
6141 unsigned int parmno
;
6144 /* If there is a parameter of incomplete type in a definition,
6145 this is an error. In a declaration this is valid, and a
6146 struct or union type may be completed later, before any calls
6147 or definition of the function. In the case where the tag was
6148 first declared within the parameter list, a warning has
6149 already been given. If a parameter has void type, then
6150 however the function cannot be defined or called, so
6153 for (parm
= arg_info
->parms
, typelt
= arg_types
, parmno
= 1;
6155 parm
= DECL_CHAIN (parm
), typelt
= TREE_CHAIN (typelt
), parmno
++)
6157 type
= TREE_VALUE (typelt
);
6158 if (type
== error_mark_node
)
6161 if (!COMPLETE_TYPE_P (type
))
6165 if (DECL_NAME (parm
))
6166 error_at (input_location
,
6167 "parameter %u (%q+D) has incomplete type",
6170 error_at (DECL_SOURCE_LOCATION (parm
),
6171 "parameter %u has incomplete type",
6174 TREE_VALUE (typelt
) = error_mark_node
;
6175 TREE_TYPE (parm
) = error_mark_node
;
6176 arg_types
= NULL_TREE
;
6178 else if (VOID_TYPE_P (type
))
6180 if (DECL_NAME (parm
))
6181 warning_at (input_location
, 0,
6182 "parameter %u (%q+D) has void type",
6185 warning_at (DECL_SOURCE_LOCATION (parm
), 0,
6186 "parameter %u has void type",
6191 errmsg
= targetm
.invalid_parameter_type (type
);
6195 TREE_VALUE (typelt
) = error_mark_node
;
6196 TREE_TYPE (parm
) = error_mark_node
;
6197 arg_types
= NULL_TREE
;
6200 if (DECL_NAME (parm
) && TREE_USED (parm
))
6201 warn_if_shadowing (parm
);
6207 /* Allocate and initialize a c_arg_info structure from the parser's
6211 build_arg_info (void)
6213 struct c_arg_info
*ret
= XOBNEW (&parser_obstack
, struct c_arg_info
);
6214 ret
->parms
= NULL_TREE
;
6216 ret
->types
= NULL_TREE
;
6217 ret
->others
= NULL_TREE
;
6218 ret
->pending_sizes
= NULL
;
6219 ret
->had_vla_unspec
= 0;
6223 /* Take apart the current scope and return a c_arg_info structure with
6224 info on a parameter list just parsed.
6226 This structure is later fed to 'grokparms' and 'store_parm_decls'.
6228 ELLIPSIS being true means the argument list ended in '...' so don't
6229 append a sentinel (void_list_node) to the end of the type-list. */
6232 get_parm_info (bool ellipsis
)
6234 struct c_binding
*b
= current_scope
->bindings
;
6235 struct c_arg_info
*arg_info
= build_arg_info ();
6238 VEC(c_arg_tag
,gc
) *tags
= NULL
;
6242 static bool explained_incomplete_types
= false;
6243 bool gave_void_only_once_err
= false;
6245 arg_info
->had_vla_unspec
= current_scope
->had_vla_unspec
;
6247 /* The bindings in this scope must not get put into a block.
6248 We will take care of deleting the binding nodes. */
6249 current_scope
->bindings
= 0;
6251 /* This function is only called if there was *something* on the
6255 /* A parameter list consisting solely of 'void' indicates that the
6256 function takes no arguments. But if the 'void' is qualified
6257 (by 'const' or 'volatile'), or has a storage class specifier
6258 ('register'), then the behavior is undefined; issue an error.
6259 Typedefs for 'void' are OK (see DR#157). */
6260 if (b
->prev
== 0 /* one binding */
6261 && TREE_CODE (b
->decl
) == PARM_DECL
/* which is a parameter */
6262 && !DECL_NAME (b
->decl
) /* anonymous */
6263 && VOID_TYPE_P (TREE_TYPE (b
->decl
))) /* of void type */
6265 if (TREE_THIS_VOLATILE (b
->decl
)
6266 || TREE_READONLY (b
->decl
)
6267 || C_DECL_REGISTER (b
->decl
))
6268 error ("%<void%> as only parameter may not be qualified");
6270 /* There cannot be an ellipsis. */
6272 error ("%<void%> must be the only parameter");
6274 arg_info
->types
= void_list_node
;
6279 types
= void_list_node
;
6281 /* Break up the bindings list into parms, tags, types, and others;
6282 apply sanity checks; purge the name-to-decl bindings. */
6285 tree decl
= b
->decl
;
6286 tree type
= TREE_TYPE (decl
);
6288 const char *keyword
;
6290 switch (TREE_CODE (decl
))
6295 gcc_assert (I_SYMBOL_BINDING (b
->id
) == b
);
6296 I_SYMBOL_BINDING (b
->id
) = b
->shadowed
;
6299 /* Check for forward decls that never got their actual decl. */
6300 if (TREE_ASM_WRITTEN (decl
))
6301 error ("parameter %q+D has just a forward declaration", decl
);
6302 /* Check for (..., void, ...) and issue an error. */
6303 else if (VOID_TYPE_P (type
) && !DECL_NAME (decl
))
6305 if (!gave_void_only_once_err
)
6307 error ("%<void%> must be the only parameter");
6308 gave_void_only_once_err
= true;
6313 /* Valid parameter, add it to the list. */
6314 DECL_CHAIN (decl
) = parms
;
6317 /* Since there is a prototype, args are passed in their
6318 declared types. The back end may override this later. */
6319 DECL_ARG_TYPE (decl
) = type
;
6320 types
= tree_cons (0, type
, types
);
6324 case ENUMERAL_TYPE
: keyword
= "enum"; goto tag
;
6325 case UNION_TYPE
: keyword
= "union"; goto tag
;
6326 case RECORD_TYPE
: keyword
= "struct"; goto tag
;
6328 /* Types may not have tag-names, in which case the type
6329 appears in the bindings list with b->id NULL. */
6332 gcc_assert (I_TAG_BINDING (b
->id
) == b
);
6333 I_TAG_BINDING (b
->id
) = b
->shadowed
;
6336 /* Warn about any struct, union or enum tags defined in a
6337 parameter list. The scope of such types is limited to
6338 the parameter list, which is rarely if ever desirable
6339 (it's impossible to call such a function with type-
6340 correct arguments). An anonymous union parm type is
6341 meaningful as a GNU extension, so don't warn for that. */
6342 if (TREE_CODE (decl
) != UNION_TYPE
|| b
->id
!= 0)
6345 /* The %s will be one of 'struct', 'union', or 'enum'. */
6346 warning (0, "%<%s %E%> declared inside parameter list",
6349 /* The %s will be one of 'struct', 'union', or 'enum'. */
6350 warning (0, "anonymous %s declared inside parameter list",
6353 if (!explained_incomplete_types
)
6355 warning (0, "its scope is only this definition or declaration,"
6356 " which is probably not what you want");
6357 explained_incomplete_types
= true;
6361 tag
= VEC_safe_push (c_arg_tag
, gc
, tags
, NULL
);
6369 /* CONST_DECLs appear here when we have an embedded enum,
6370 and TYPE_DECLs appear here when we have an embedded struct
6371 or union. No warnings for this - we already warned about the
6372 type itself. FUNCTION_DECLs appear when there is an implicit
6373 function declaration in the parameter list. */
6375 /* When we reinsert this decl in the function body, we need
6376 to reconstruct whether it was marked as nested. */
6377 gcc_assert (TREE_CODE (decl
) == FUNCTION_DECL
6380 DECL_CHAIN (decl
) = others
;
6385 /* error_mark_node appears here when we have an undeclared
6386 variable. Just throw it away. */
6389 gcc_assert (I_SYMBOL_BINDING (b
->id
) == b
);
6390 I_SYMBOL_BINDING (b
->id
) = b
->shadowed
;
6394 /* Other things that might be encountered. */
6401 b
= free_binding_and_advance (b
);
6404 arg_info
->parms
= parms
;
6405 arg_info
->tags
= tags
;
6406 arg_info
->types
= types
;
6407 arg_info
->others
= others
;
6408 arg_info
->pending_sizes
= get_pending_sizes ();
6412 /* Get the struct, enum or union (CODE says which) with tag NAME.
6413 Define the tag as a forward-reference with location LOC if it is
6414 not defined. Return a c_typespec structure for the type
6418 parser_xref_tag (location_t loc
, enum tree_code code
, tree name
)
6420 struct c_typespec ret
;
6424 ret
.expr
= NULL_TREE
;
6425 ret
.expr_const_operands
= true;
6427 /* If a cross reference is requested, look up the type
6428 already defined for this tag and return it. */
6430 ref
= lookup_tag (code
, name
, 0, &refloc
);
6431 /* If this is the right type of tag, return what we found.
6432 (This reference will be shadowed by shadow_tag later if appropriate.)
6433 If this is the wrong type of tag, do not return it. If it was the
6434 wrong type in the same scope, we will have had an error
6435 message already; if in a different scope and declaring
6436 a name, pending_xref_error will give an error message; but if in a
6437 different scope and not declaring a name, this tag should
6438 shadow the previous declaration of a different type of tag, and
6439 this would not work properly if we return the reference found.
6440 (For example, with "struct foo" in an outer scope, "union foo;"
6441 must shadow that tag with a new one of union type.) */
6442 ret
.kind
= (ref
? ctsk_tagref
: ctsk_tagfirstref
);
6443 if (ref
&& TREE_CODE (ref
) == code
)
6445 if (C_TYPE_DEFINED_IN_STRUCT (ref
)
6446 && loc
!= UNKNOWN_LOCATION
6452 warning_at (loc
, OPT_Wc___compat
,
6453 ("enum type defined in struct or union "
6454 "is not visible in C++"));
6455 inform (refloc
, "enum type defined here");
6458 warning_at (loc
, OPT_Wc___compat
,
6459 ("struct defined in struct or union "
6460 "is not visible in C++"));
6461 inform (refloc
, "struct defined here");
6464 warning_at (loc
, OPT_Wc___compat
,
6465 ("union defined in struct or union "
6466 "is not visible in C++"));
6467 inform (refloc
, "union defined here");
6478 /* If no such tag is yet defined, create a forward-reference node
6479 and record it as the "definition".
6480 When a real declaration of this type is found,
6481 the forward-reference will be altered into a real type. */
6483 ref
= make_node (code
);
6484 if (code
== ENUMERAL_TYPE
)
6486 /* Give the type a default layout like unsigned int
6487 to avoid crashing if it does not get defined. */
6488 SET_TYPE_MODE (ref
, TYPE_MODE (unsigned_type_node
));
6489 TYPE_ALIGN (ref
) = TYPE_ALIGN (unsigned_type_node
);
6490 TYPE_USER_ALIGN (ref
) = 0;
6491 TYPE_UNSIGNED (ref
) = 1;
6492 TYPE_PRECISION (ref
) = TYPE_PRECISION (unsigned_type_node
);
6493 TYPE_MIN_VALUE (ref
) = TYPE_MIN_VALUE (unsigned_type_node
);
6494 TYPE_MAX_VALUE (ref
) = TYPE_MAX_VALUE (unsigned_type_node
);
6497 pushtag (loc
, name
, ref
);
6503 /* Get the struct, enum or union (CODE says which) with tag NAME.
6504 Define the tag as a forward-reference if it is not defined.
6505 Return a tree for the type. */
6508 xref_tag (enum tree_code code
, tree name
)
6510 return parser_xref_tag (input_location
, code
, name
).spec
;
6513 /* Make sure that the tag NAME is defined *in the current scope*
6514 at least as a forward reference.
6515 LOC is the location of the struct's definition.
6516 CODE says which kind of tag NAME ought to be.
6518 This stores the current value of the file static STRUCT_PARSE_INFO
6519 in *ENCLOSING_STRUCT_PARSE_INFO, and points STRUCT_PARSE_INFO at a
6520 new c_struct_parse_info structure. The old value of
6521 STRUCT_PARSE_INFO is restored in finish_struct. */
6524 start_struct (location_t loc
, enum tree_code code
, tree name
,
6525 struct c_struct_parse_info
**enclosing_struct_parse_info
)
6527 /* If there is already a tag defined at this scope
6528 (as a forward reference), just return it. */
6530 tree ref
= NULL_TREE
;
6531 location_t refloc
= UNKNOWN_LOCATION
;
6533 if (name
!= NULL_TREE
)
6534 ref
= lookup_tag (code
, name
, 1, &refloc
);
6535 if (ref
&& TREE_CODE (ref
) == code
)
6537 if (TYPE_SIZE (ref
))
6539 if (code
== UNION_TYPE
)
6540 error_at (loc
, "redefinition of %<union %E%>", name
);
6542 error_at (loc
, "redefinition of %<struct %E%>", name
);
6543 if (refloc
!= UNKNOWN_LOCATION
)
6544 inform (refloc
, "originally defined here");
6545 /* Don't create structures using a name already in use. */
6548 else if (C_TYPE_BEING_DEFINED (ref
))
6550 if (code
== UNION_TYPE
)
6551 error_at (loc
, "nested redefinition of %<union %E%>", name
);
6553 error_at (loc
, "nested redefinition of %<struct %E%>", name
);
6554 /* Don't bother to report "originally defined here" for a
6555 nested redefinition; the original definition should be
6557 /* Don't create structures that contain themselves. */
6562 /* Otherwise create a forward-reference just so the tag is in scope. */
6564 if (ref
== NULL_TREE
|| TREE_CODE (ref
) != code
)
6566 ref
= make_node (code
);
6567 pushtag (loc
, name
, ref
);
6570 C_TYPE_BEING_DEFINED (ref
) = 1;
6571 TYPE_PACKED (ref
) = flag_pack_struct
;
6573 *enclosing_struct_parse_info
= struct_parse_info
;
6574 struct_parse_info
= XNEW (struct c_struct_parse_info
);
6575 struct_parse_info
->struct_types
= VEC_alloc (tree
, heap
, 0);
6576 struct_parse_info
->fields
= VEC_alloc (c_binding_ptr
, heap
, 0);
6577 struct_parse_info
->typedefs_seen
= VEC_alloc (tree
, heap
, 0);
6579 /* FIXME: This will issue a warning for a use of a type defined
6580 within a statement expr used within sizeof, et. al. This is not
6581 terribly serious as C++ doesn't permit statement exprs within
6583 if (warn_cxx_compat
&& (in_sizeof
|| in_typeof
|| in_alignof
))
6584 warning_at (loc
, OPT_Wc___compat
,
6585 "defining type in %qs expression is invalid in C++",
6588 : (in_typeof
? "typeof" : "alignof")));
6593 /* Process the specs, declarator and width (NULL if omitted)
6594 of a structure component, returning a FIELD_DECL node.
6595 WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node.
6596 DECL_ATTRS is as for grokdeclarator.
6598 LOC is the location of the structure component.
6600 This is done during the parsing of the struct declaration.
6601 The FIELD_DECL nodes are chained together and the lot of them
6602 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
6605 grokfield (location_t loc
,
6606 struct c_declarator
*declarator
, struct c_declspecs
*declspecs
,
6607 tree width
, tree
*decl_attrs
)
6611 if (declarator
->kind
== cdk_id
&& declarator
->u
.id
== NULL_TREE
6612 && width
== NULL_TREE
)
6614 /* This is an unnamed decl.
6616 If we have something of the form "union { list } ;" then this
6617 is the anonymous union extension. Similarly for struct.
6619 If this is something of the form "struct foo;", then
6620 If MS extensions are enabled, this is handled as an
6622 Otherwise this is a forward declaration of a structure tag.
6624 If this is something of the form "foo;" and foo is a TYPE_DECL, then
6625 If foo names a structure or union without a tag, then this
6626 is an anonymous struct (this is permitted by C1X).
6627 If MS extensions are enabled and foo names a structure, then
6628 again this is an anonymous struct.
6629 Otherwise this is an error.
6631 Oh what a horrid tangled web we weave. I wonder if MS consciously
6632 took this from Plan 9 or if it was an accident of implementation
6633 that took root before someone noticed the bug... */
6635 tree type
= declspecs
->type
;
6636 bool type_ok
= (TREE_CODE (type
) == RECORD_TYPE
6637 || TREE_CODE (type
) == UNION_TYPE
);
6642 if (flag_ms_extensions
)
6644 else if (TYPE_NAME (TYPE_MAIN_VARIANT (type
)) == NULL
)
6651 pedwarn (loc
, 0, "declaration does not declare anything");
6657 pedwarn (loc
, OPT_pedantic
,
6658 "ISO C99 doesn%'t support unnamed structs/unions");
6660 pedwarn (loc
, OPT_pedantic
,
6661 "ISO C90 doesn%'t support unnamed structs/unions");
6665 value
= grokdeclarator (declarator
, declspecs
, FIELD
, false,
6666 width
? &width
: NULL
, decl_attrs
, NULL
, NULL
,
6669 finish_decl (value
, loc
, NULL_TREE
, NULL_TREE
, NULL_TREE
);
6670 DECL_INITIAL (value
) = width
;
6672 if (warn_cxx_compat
&& DECL_NAME (value
) != NULL_TREE
)
6674 /* If we currently have a binding for this field, set the
6675 in_struct field in the binding, so that we warn about lookups
6677 struct c_binding
*b
= I_SYMBOL_BINDING (DECL_NAME (value
));
6680 /* If the in_struct field is not yet set, push it on a list
6681 to be cleared when this struct is finished. */
6684 VEC_safe_push (c_binding_ptr
, heap
,
6685 struct_parse_info
->fields
, b
);
6694 /* Subroutine of detect_field_duplicates: add the fields of FIELDLIST
6695 to HTAB, giving errors for any duplicates. */
6698 detect_field_duplicates_hash (tree fieldlist
, htab_t htab
)
6703 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
6704 if ((y
= DECL_NAME (x
)) != 0)
6706 slot
= htab_find_slot (htab
, y
, INSERT
);
6709 error ("duplicate member %q+D", x
);
6710 DECL_NAME (x
) = NULL_TREE
;
6714 else if (TREE_CODE (TREE_TYPE (x
)) == RECORD_TYPE
6715 || TREE_CODE (TREE_TYPE (x
)) == UNION_TYPE
)
6716 detect_field_duplicates_hash (TYPE_FIELDS (TREE_TYPE (x
)), htab
);
6719 /* Generate an error for any duplicate field names in FIELDLIST. Munge
6720 the list such that this does not present a problem later. */
6723 detect_field_duplicates (tree fieldlist
)
6728 /* First, see if there are more than "a few" fields.
6729 This is trivially true if there are zero or one fields. */
6732 x
= DECL_CHAIN (fieldlist
);
6737 if (DECL_NAME (x
) == NULL_TREE
6738 && (TREE_CODE (TREE_TYPE (x
)) == RECORD_TYPE
6739 || TREE_CODE (TREE_TYPE (x
)) == UNION_TYPE
))
6742 } while (timeout
> 0 && x
);
6744 /* If there were "few" fields and no anonymous structures or unions,
6745 avoid the overhead of allocating a hash table. Instead just do
6746 the nested traversal thing. */
6749 for (x
= DECL_CHAIN (fieldlist
); x
; x
= DECL_CHAIN (x
))
6752 for (y
= fieldlist
; y
!= x
; y
= TREE_CHAIN (y
))
6753 if (DECL_NAME (y
) == DECL_NAME (x
))
6755 error ("duplicate member %q+D", x
);
6756 DECL_NAME (x
) = NULL_TREE
;
6762 htab_t htab
= htab_create (37, htab_hash_pointer
, htab_eq_pointer
, NULL
);
6764 detect_field_duplicates_hash (fieldlist
, htab
);
6769 /* Finish up struct info used by -Wc++-compat. */
6772 warn_cxx_compat_finish_struct (tree fieldlist
)
6776 struct c_binding
*b
;
6778 /* Set the C_TYPE_DEFINED_IN_STRUCT flag for each type defined in
6779 the current struct. We do this now at the end of the struct
6780 because the flag is used to issue visibility warnings, and we
6781 only want to issue those warnings if the type is referenced
6782 outside of the struct declaration. */
6783 FOR_EACH_VEC_ELT (tree
, struct_parse_info
->struct_types
, ix
, x
)
6784 C_TYPE_DEFINED_IN_STRUCT (x
) = 1;
6786 /* The TYPEDEFS_SEEN field of STRUCT_PARSE_INFO is a list of
6787 typedefs used when declaring fields in this struct. If the name
6788 of any of the fields is also a typedef name then the struct would
6789 not parse in C++, because the C++ lookup rules say that the
6790 typedef name would be looked up in the context of the struct, and
6791 would thus be the field rather than the typedef. */
6792 if (!VEC_empty (tree
, struct_parse_info
->typedefs_seen
)
6793 && fieldlist
!= NULL_TREE
)
6795 /* Use a pointer_set using the name of the typedef. We can use
6796 a pointer_set because identifiers are interned. */
6797 struct pointer_set_t
*tset
= pointer_set_create ();
6799 FOR_EACH_VEC_ELT (tree
, struct_parse_info
->typedefs_seen
, ix
, x
)
6800 pointer_set_insert (tset
, DECL_NAME (x
));
6802 for (x
= fieldlist
; x
!= NULL_TREE
; x
= DECL_CHAIN (x
))
6804 if (pointer_set_contains (tset
, DECL_NAME (x
)))
6806 warning_at (DECL_SOURCE_LOCATION (x
), OPT_Wc___compat
,
6807 ("using %qD as both field and typedef name is "
6810 /* FIXME: It would be nice to report the location where
6811 the typedef name is used. */
6815 pointer_set_destroy (tset
);
6818 /* For each field which has a binding and which was not defined in
6819 an enclosing struct, clear the in_struct field. */
6820 FOR_EACH_VEC_ELT (c_binding_ptr
, struct_parse_info
->fields
, ix
, b
)
6824 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
6825 LOC is the location of the RECORD_TYPE or UNION_TYPE's definition.
6826 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
6827 ATTRIBUTES are attributes to be applied to the structure.
6829 ENCLOSING_STRUCT_PARSE_INFO is the value of STRUCT_PARSE_INFO when
6830 the struct was started. */
6833 finish_struct (location_t loc
, tree t
, tree fieldlist
, tree attributes
,
6834 struct c_struct_parse_info
*enclosing_struct_parse_info
)
6837 bool toplevel
= file_scope
== current_scope
;
6838 int saw_named_field
;
6840 /* If this type was previously laid out as a forward reference,
6841 make sure we lay it out again. */
6845 decl_attributes (&t
, attributes
, (int) ATTR_FLAG_TYPE_IN_PLACE
);
6849 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
6851 if (DECL_NAME (x
) != 0)
6854 && (TREE_CODE (TREE_TYPE (x
)) == RECORD_TYPE
6855 || TREE_CODE (TREE_TYPE (x
)) == UNION_TYPE
))
6861 if (TREE_CODE (t
) == UNION_TYPE
)
6864 pedwarn (loc
, OPT_pedantic
, "union has no named members");
6866 pedwarn (loc
, OPT_pedantic
, "union has no members");
6871 pedwarn (loc
, OPT_pedantic
, "struct has no named members");
6873 pedwarn (loc
, OPT_pedantic
, "struct has no members");
6878 /* Install struct as DECL_CONTEXT of each field decl.
6879 Also process specified field sizes, found in the DECL_INITIAL,
6880 storing 0 there after the type has been changed to precision equal
6881 to its width, rather than the precision of the specified standard
6882 type. (Correct layout requires the original type to have been preserved
6885 saw_named_field
= 0;
6886 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
6888 if (TREE_TYPE (x
) == error_mark_node
)
6891 DECL_CONTEXT (x
) = t
;
6893 /* If any field is const, the structure type is pseudo-const. */
6894 if (TREE_READONLY (x
))
6895 C_TYPE_FIELDS_READONLY (t
) = 1;
6898 /* A field that is pseudo-const makes the structure likewise. */
6899 tree t1
= strip_array_types (TREE_TYPE (x
));
6900 if ((TREE_CODE (t1
) == RECORD_TYPE
|| TREE_CODE (t1
) == UNION_TYPE
)
6901 && C_TYPE_FIELDS_READONLY (t1
))
6902 C_TYPE_FIELDS_READONLY (t
) = 1;
6905 /* Any field that is volatile means variables of this type must be
6906 treated in some ways as volatile. */
6907 if (TREE_THIS_VOLATILE (x
))
6908 C_TYPE_FIELDS_VOLATILE (t
) = 1;
6910 /* Any field of nominal variable size implies structure is too. */
6911 if (C_DECL_VARIABLE_SIZE (x
))
6912 C_TYPE_VARIABLE_SIZE (t
) = 1;
6914 if (DECL_INITIAL (x
))
6916 unsigned HOST_WIDE_INT width
= tree_low_cst (DECL_INITIAL (x
), 1);
6917 DECL_SIZE (x
) = bitsize_int (width
);
6918 DECL_BIT_FIELD (x
) = 1;
6919 SET_DECL_C_BIT_FIELD (x
);
6923 && (DECL_BIT_FIELD (x
)
6924 || TYPE_ALIGN (TREE_TYPE (x
)) > BITS_PER_UNIT
))
6925 DECL_PACKED (x
) = 1;
6927 /* Detect flexible array member in an invalid context. */
6928 if (TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
6929 && TYPE_SIZE (TREE_TYPE (x
)) == NULL_TREE
6930 && TYPE_DOMAIN (TREE_TYPE (x
)) != NULL_TREE
6931 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x
))) == NULL_TREE
)
6933 if (TREE_CODE (t
) == UNION_TYPE
)
6935 error_at (DECL_SOURCE_LOCATION (x
),
6936 "flexible array member in union");
6937 TREE_TYPE (x
) = error_mark_node
;
6939 else if (DECL_CHAIN (x
) != NULL_TREE
)
6941 error_at (DECL_SOURCE_LOCATION (x
),
6942 "flexible array member not at end of struct");
6943 TREE_TYPE (x
) = error_mark_node
;
6945 else if (!saw_named_field
)
6947 error_at (DECL_SOURCE_LOCATION (x
),
6948 "flexible array member in otherwise empty struct");
6949 TREE_TYPE (x
) = error_mark_node
;
6953 if (pedantic
&& TREE_CODE (t
) == RECORD_TYPE
6954 && flexible_array_type_p (TREE_TYPE (x
)))
6955 pedwarn (DECL_SOURCE_LOCATION (x
), OPT_pedantic
,
6956 "invalid use of structure with flexible array member");
6959 || TREE_CODE (TREE_TYPE (x
)) == RECORD_TYPE
6960 || TREE_CODE (TREE_TYPE (x
)) == UNION_TYPE
)
6961 saw_named_field
= 1;
6964 detect_field_duplicates (fieldlist
);
6966 /* Now we have the nearly final fieldlist. Record it,
6967 then lay out the structure or union (including the fields). */
6969 TYPE_FIELDS (t
) = fieldlist
;
6973 /* Give bit-fields their proper types. */
6975 tree
*fieldlistp
= &fieldlist
;
6977 if (TREE_CODE (*fieldlistp
) == FIELD_DECL
&& DECL_INITIAL (*fieldlistp
)
6978 && TREE_TYPE (*fieldlistp
) != error_mark_node
)
6980 unsigned HOST_WIDE_INT width
6981 = tree_low_cst (DECL_INITIAL (*fieldlistp
), 1);
6982 tree type
= TREE_TYPE (*fieldlistp
);
6983 if (width
!= TYPE_PRECISION (type
))
6985 TREE_TYPE (*fieldlistp
)
6986 = c_build_bitfield_integer_type (width
, TYPE_UNSIGNED (type
));
6987 DECL_MODE (*fieldlistp
) = TYPE_MODE (TREE_TYPE (*fieldlistp
));
6989 DECL_INITIAL (*fieldlistp
) = 0;
6992 fieldlistp
= &DECL_CHAIN (*fieldlistp
);
6995 /* Now we have the truly final field list.
6996 Store it in this type and in the variants. */
6998 TYPE_FIELDS (t
) = fieldlist
;
7000 /* If there are lots of fields, sort so we can look through them fast.
7001 We arbitrarily consider 16 or more elts to be "a lot". */
7006 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
7008 if (len
> 15 || DECL_NAME (x
) == NULL
)
7016 struct lang_type
*space
;
7017 struct sorted_fields_type
*space2
;
7019 len
+= list_length (x
);
7021 /* Use the same allocation policy here that make_node uses, to
7022 ensure that this lives as long as the rest of the struct decl.
7023 All decls in an inline function need to be saved. */
7025 space
= ggc_alloc_cleared_lang_type (sizeof (struct lang_type
));
7026 space2
= ggc_alloc_sorted_fields_type
7027 (sizeof (struct sorted_fields_type
) + len
* sizeof (tree
));
7031 field_array
= &space2
->elts
[0];
7032 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
7034 field_array
[len
++] = x
;
7036 /* If there is anonymous struct or union, break out of the loop. */
7037 if (DECL_NAME (x
) == NULL
)
7040 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
7043 TYPE_LANG_SPECIFIC (t
) = space
;
7044 TYPE_LANG_SPECIFIC (t
)->s
->len
= len
;
7045 field_array
= TYPE_LANG_SPECIFIC (t
)->s
->elts
;
7046 qsort (field_array
, len
, sizeof (tree
), field_decl_cmp
);
7051 for (x
= TYPE_MAIN_VARIANT (t
); x
; x
= TYPE_NEXT_VARIANT (x
))
7053 TYPE_FIELDS (x
) = TYPE_FIELDS (t
);
7054 TYPE_LANG_SPECIFIC (x
) = TYPE_LANG_SPECIFIC (t
);
7055 C_TYPE_FIELDS_READONLY (x
) = C_TYPE_FIELDS_READONLY (t
);
7056 C_TYPE_FIELDS_VOLATILE (x
) = C_TYPE_FIELDS_VOLATILE (t
);
7057 C_TYPE_VARIABLE_SIZE (x
) = C_TYPE_VARIABLE_SIZE (t
);
7060 /* If this was supposed to be a transparent union, but we can't
7061 make it one, warn and turn off the flag. */
7062 if (TREE_CODE (t
) == UNION_TYPE
7063 && TYPE_TRANSPARENT_AGGR (t
)
7064 && (!TYPE_FIELDS (t
) || TYPE_MODE (t
) != DECL_MODE (TYPE_FIELDS (t
))))
7066 TYPE_TRANSPARENT_AGGR (t
) = 0;
7067 warning_at (loc
, 0, "union cannot be made transparent");
7070 /* If this structure or union completes the type of any previous
7071 variable declaration, lay it out and output its rtl. */
7072 for (x
= C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t
));
7076 tree decl
= TREE_VALUE (x
);
7077 if (TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
)
7078 layout_array_type (TREE_TYPE (decl
));
7079 if (TREE_CODE (decl
) != TYPE_DECL
)
7081 layout_decl (decl
, 0);
7082 if (c_dialect_objc ())
7083 objc_check_decl (decl
);
7084 rest_of_decl_compilation (decl
, toplevel
, 0);
7089 C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t
)) = 0;
7091 /* Update type location to the one of the definition, instead of e.g.
7092 a forward declaration. */
7093 if (TYPE_STUB_DECL (t
))
7094 DECL_SOURCE_LOCATION (TYPE_STUB_DECL (t
)) = loc
;
7096 /* Finish debugging output for this type. */
7097 rest_of_type_compilation (t
, toplevel
);
7099 /* If we're inside a function proper, i.e. not file-scope and not still
7100 parsing parameters, then arrange for the size of a variable sized type
7102 if (cur_stmt_list
&& variably_modified_type_p (t
, NULL_TREE
))
7103 add_stmt (build_stmt (loc
,
7104 DECL_EXPR
, build_decl (loc
, TYPE_DECL
, NULL
, t
)));
7106 if (warn_cxx_compat
)
7107 warn_cxx_compat_finish_struct (fieldlist
);
7109 VEC_free (tree
, heap
, struct_parse_info
->struct_types
);
7110 VEC_free (c_binding_ptr
, heap
, struct_parse_info
->fields
);
7111 VEC_free (tree
, heap
, struct_parse_info
->typedefs_seen
);
7112 XDELETE (struct_parse_info
);
7114 struct_parse_info
= enclosing_struct_parse_info
;
7116 /* If this struct is defined inside a struct, add it to
7119 && struct_parse_info
!= NULL
7120 && !in_sizeof
&& !in_typeof
&& !in_alignof
)
7121 VEC_safe_push (tree
, heap
, struct_parse_info
->struct_types
, t
);
7126 /* Lay out the type T, and its element type, and so on. */
7129 layout_array_type (tree t
)
7131 if (TREE_CODE (TREE_TYPE (t
)) == ARRAY_TYPE
)
7132 layout_array_type (TREE_TYPE (t
));
7136 /* Begin compiling the definition of an enumeration type.
7137 NAME is its name (or null if anonymous).
7138 LOC is the enum's location.
7139 Returns the type object, as yet incomplete.
7140 Also records info about it so that build_enumerator
7141 may be used to declare the individual values as they are read. */
7144 start_enum (location_t loc
, struct c_enum_contents
*the_enum
, tree name
)
7146 tree enumtype
= NULL_TREE
;
7147 location_t enumloc
= UNKNOWN_LOCATION
;
7149 /* If this is the real definition for a previous forward reference,
7150 fill in the contents in the same object that used to be the
7151 forward reference. */
7153 if (name
!= NULL_TREE
)
7154 enumtype
= lookup_tag (ENUMERAL_TYPE
, name
, 1, &enumloc
);
7156 if (enumtype
== 0 || TREE_CODE (enumtype
) != ENUMERAL_TYPE
)
7158 enumtype
= make_node (ENUMERAL_TYPE
);
7159 pushtag (loc
, name
, enumtype
);
7162 if (C_TYPE_BEING_DEFINED (enumtype
))
7163 error_at (loc
, "nested redefinition of %<enum %E%>", name
);
7165 C_TYPE_BEING_DEFINED (enumtype
) = 1;
7167 if (TYPE_VALUES (enumtype
) != 0)
7169 /* This enum is a named one that has been declared already. */
7170 error_at (loc
, "redeclaration of %<enum %E%>", name
);
7171 if (enumloc
!= UNKNOWN_LOCATION
)
7172 inform (enumloc
, "originally defined here");
7174 /* Completely replace its old definition.
7175 The old enumerators remain defined, however. */
7176 TYPE_VALUES (enumtype
) = 0;
7179 the_enum
->enum_next_value
= integer_zero_node
;
7180 the_enum
->enum_overflow
= 0;
7182 if (flag_short_enums
)
7183 TYPE_PACKED (enumtype
) = 1;
7185 /* FIXME: This will issue a warning for a use of a type defined
7186 within sizeof in a statement expr. This is not terribly serious
7187 as C++ doesn't permit statement exprs within sizeof anyhow. */
7188 if (warn_cxx_compat
&& (in_sizeof
|| in_typeof
|| in_alignof
))
7189 warning_at (loc
, OPT_Wc___compat
,
7190 "defining type in %qs expression is invalid in C++",
7193 : (in_typeof
? "typeof" : "alignof")));
7198 /* After processing and defining all the values of an enumeration type,
7199 install their decls in the enumeration type and finish it off.
7200 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
7201 and ATTRIBUTES are the specified attributes.
7202 Returns ENUMTYPE. */
7205 finish_enum (tree enumtype
, tree values
, tree attributes
)
7208 tree minnode
= 0, maxnode
= 0;
7209 int precision
, unsign
;
7210 bool toplevel
= (file_scope
== current_scope
);
7211 struct lang_type
*lt
;
7213 decl_attributes (&enumtype
, attributes
, (int) ATTR_FLAG_TYPE_IN_PLACE
);
7215 /* Calculate the maximum value of any enumerator in this type. */
7217 if (values
== error_mark_node
)
7218 minnode
= maxnode
= integer_zero_node
;
7221 minnode
= maxnode
= TREE_VALUE (values
);
7222 for (pair
= TREE_CHAIN (values
); pair
; pair
= TREE_CHAIN (pair
))
7224 tree value
= TREE_VALUE (pair
);
7225 if (tree_int_cst_lt (maxnode
, value
))
7227 if (tree_int_cst_lt (value
, minnode
))
7232 /* Construct the final type of this enumeration. It is the same
7233 as one of the integral types - the narrowest one that fits, except
7234 that normally we only go as narrow as int - and signed iff any of
7235 the values are negative. */
7236 unsign
= (tree_int_cst_sgn (minnode
) >= 0);
7237 precision
= MAX (tree_int_cst_min_precision (minnode
, unsign
),
7238 tree_int_cst_min_precision (maxnode
, unsign
));
7240 if (TYPE_PACKED (enumtype
) || precision
> TYPE_PRECISION (integer_type_node
))
7242 tem
= c_common_type_for_size (precision
, unsign
);
7245 warning (0, "enumeration values exceed range of largest integer");
7246 tem
= long_long_integer_type_node
;
7250 tem
= unsign
? unsigned_type_node
: integer_type_node
;
7252 TYPE_MIN_VALUE (enumtype
) = TYPE_MIN_VALUE (tem
);
7253 TYPE_MAX_VALUE (enumtype
) = TYPE_MAX_VALUE (tem
);
7254 TYPE_UNSIGNED (enumtype
) = TYPE_UNSIGNED (tem
);
7255 TYPE_SIZE (enumtype
) = 0;
7257 /* If the precision of the type was specific with an attribute and it
7258 was too small, give an error. Otherwise, use it. */
7259 if (TYPE_PRECISION (enumtype
))
7261 if (precision
> TYPE_PRECISION (enumtype
))
7262 error ("specified mode too small for enumeral values");
7265 TYPE_PRECISION (enumtype
) = TYPE_PRECISION (tem
);
7267 layout_type (enumtype
);
7269 if (values
!= error_mark_node
)
7271 /* Change the type of the enumerators to be the enum type. We
7272 need to do this irrespective of the size of the enum, for
7273 proper type checking. Replace the DECL_INITIALs of the
7274 enumerators, and the value slots of the list, with copies
7275 that have the enum type; they cannot be modified in place
7276 because they may be shared (e.g. integer_zero_node) Finally,
7277 change the purpose slots to point to the names of the decls. */
7278 for (pair
= values
; pair
; pair
= TREE_CHAIN (pair
))
7280 tree enu
= TREE_PURPOSE (pair
);
7281 tree ini
= DECL_INITIAL (enu
);
7283 TREE_TYPE (enu
) = enumtype
;
7285 /* The ISO C Standard mandates enumerators to have type int,
7286 even though the underlying type of an enum type is
7287 unspecified. However, GCC allows enumerators of any
7288 integer type as an extensions. build_enumerator()
7289 converts any enumerators that fit in an int to type int,
7290 to avoid promotions to unsigned types when comparing
7291 integers with enumerators that fit in the int range.
7292 When -pedantic is given, build_enumerator() would have
7293 already warned about those that don't fit. Here we
7294 convert the rest to the enumerator type. */
7295 if (TREE_TYPE (ini
) != integer_type_node
)
7296 ini
= convert (enumtype
, ini
);
7298 DECL_INITIAL (enu
) = ini
;
7299 TREE_PURPOSE (pair
) = DECL_NAME (enu
);
7300 TREE_VALUE (pair
) = ini
;
7303 TYPE_VALUES (enumtype
) = values
;
7306 /* Record the min/max values so that we can warn about bit-field
7307 enumerations that are too small for the values. */
7308 lt
= ggc_alloc_cleared_lang_type (sizeof (struct lang_type
));
7309 lt
->enum_min
= minnode
;
7310 lt
->enum_max
= maxnode
;
7311 TYPE_LANG_SPECIFIC (enumtype
) = lt
;
7313 /* Fix up all variant types of this enum type. */
7314 for (tem
= TYPE_MAIN_VARIANT (enumtype
); tem
; tem
= TYPE_NEXT_VARIANT (tem
))
7316 if (tem
== enumtype
)
7318 TYPE_VALUES (tem
) = TYPE_VALUES (enumtype
);
7319 TYPE_MIN_VALUE (tem
) = TYPE_MIN_VALUE (enumtype
);
7320 TYPE_MAX_VALUE (tem
) = TYPE_MAX_VALUE (enumtype
);
7321 TYPE_SIZE (tem
) = TYPE_SIZE (enumtype
);
7322 TYPE_SIZE_UNIT (tem
) = TYPE_SIZE_UNIT (enumtype
);
7323 SET_TYPE_MODE (tem
, TYPE_MODE (enumtype
));
7324 TYPE_PRECISION (tem
) = TYPE_PRECISION (enumtype
);
7325 TYPE_ALIGN (tem
) = TYPE_ALIGN (enumtype
);
7326 TYPE_USER_ALIGN (tem
) = TYPE_USER_ALIGN (enumtype
);
7327 TYPE_UNSIGNED (tem
) = TYPE_UNSIGNED (enumtype
);
7328 TYPE_LANG_SPECIFIC (tem
) = TYPE_LANG_SPECIFIC (enumtype
);
7331 /* Finish debugging output for this type. */
7332 rest_of_type_compilation (enumtype
, toplevel
);
7334 /* If this enum is defined inside a struct, add it to
7337 && struct_parse_info
!= NULL
7338 && !in_sizeof
&& !in_typeof
&& !in_alignof
)
7339 VEC_safe_push (tree
, heap
, struct_parse_info
->struct_types
, enumtype
);
7344 /* Build and install a CONST_DECL for one value of the
7345 current enumeration type (one that was begun with start_enum).
7346 DECL_LOC is the location of the enumerator.
7347 LOC is the location of the '=' operator if any, DECL_LOC otherwise.
7348 Return a tree-list containing the CONST_DECL and its value.
7349 Assignment of sequential values by default is handled here. */
7352 build_enumerator (location_t decl_loc
, location_t loc
,
7353 struct c_enum_contents
*the_enum
, tree name
, tree value
)
7357 /* Validate and default VALUE. */
7361 /* Don't issue more errors for error_mark_node (i.e. an
7362 undeclared identifier) - just ignore the value expression. */
7363 if (value
== error_mark_node
)
7365 else if (!INTEGRAL_TYPE_P (TREE_TYPE (value
)))
7367 error_at (loc
, "enumerator value for %qE is not an integer constant",
7373 if (TREE_CODE (value
) != INTEGER_CST
)
7375 value
= c_fully_fold (value
, false, NULL
);
7376 if (TREE_CODE (value
) == INTEGER_CST
)
7377 pedwarn (loc
, OPT_pedantic
,
7378 "enumerator value for %qE is not an integer "
7379 "constant expression", name
);
7381 if (TREE_CODE (value
) != INTEGER_CST
)
7383 error ("enumerator value for %qE is not an integer constant",
7389 value
= default_conversion (value
);
7390 constant_expression_warning (value
);
7395 /* Default based on previous value. */
7396 /* It should no longer be possible to have NON_LVALUE_EXPR
7400 value
= the_enum
->enum_next_value
;
7401 if (the_enum
->enum_overflow
)
7402 error_at (loc
, "overflow in enumeration values");
7404 /* Even though the underlying type of an enum is unspecified, the
7405 type of enumeration constants is explicitly defined as int
7406 (6.4.4.3/2 in the C99 Standard). GCC allows any integer type as
7408 else if (!int_fits_type_p (value
, integer_type_node
))
7409 pedwarn (loc
, OPT_pedantic
,
7410 "ISO C restricts enumerator values to range of %<int%>");
7412 /* The ISO C Standard mandates enumerators to have type int, even
7413 though the underlying type of an enum type is unspecified.
7414 However, GCC allows enumerators of any integer type as an
7415 extensions. Here we convert any enumerators that fit in an int
7416 to type int, to avoid promotions to unsigned types when comparing
7417 integers with enumerators that fit in the int range. When
7418 -pedantic is given, we would have already warned about those that
7419 don't fit. We have to do this here rather than in finish_enum
7420 because this value may be used to define more enumerators. */
7421 if (int_fits_type_p (value
, integer_type_node
))
7422 value
= convert (integer_type_node
, value
);
7424 /* Set basis for default for next value. */
7425 the_enum
->enum_next_value
7427 (EXPR_HAS_LOCATION (value
) ? EXPR_LOCATION (value
) : input_location
,
7428 PLUS_EXPR
, value
, integer_one_node
, 0);
7429 the_enum
->enum_overflow
= tree_int_cst_lt (the_enum
->enum_next_value
, value
);
7431 /* Now create a declaration for the enum value name. */
7433 type
= TREE_TYPE (value
);
7434 type
= c_common_type_for_size (MAX (TYPE_PRECISION (type
),
7435 TYPE_PRECISION (integer_type_node
)),
7436 (TYPE_PRECISION (type
)
7437 >= TYPE_PRECISION (integer_type_node
)
7438 && TYPE_UNSIGNED (type
)));
7440 decl
= build_decl (decl_loc
, CONST_DECL
, name
, type
);
7441 DECL_INITIAL (decl
) = convert (type
, value
);
7444 return tree_cons (decl
, value
, NULL_TREE
);
7448 /* Create the FUNCTION_DECL for a function definition.
7449 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
7450 the declaration; they describe the function's name and the type it returns,
7451 but twisted together in a fashion that parallels the syntax of C.
7453 This function creates a binding context for the function body
7454 as well as setting up the FUNCTION_DECL in current_function_decl.
7456 Returns 1 on success. If the DECLARATOR is not suitable for a function
7457 (it defines a datum instead), we return 0, which tells
7458 yyparse to report a parse error. */
7461 start_function (struct c_declspecs
*declspecs
, struct c_declarator
*declarator
,
7464 tree decl1
, old_decl
;
7465 tree restype
, resdecl
;
7468 current_function_returns_value
= 0; /* Assume, until we see it does. */
7469 current_function_returns_null
= 0;
7470 current_function_returns_abnormally
= 0;
7471 warn_about_return_type
= 0;
7472 c_switch_stack
= NULL
;
7474 /* Indicate no valid break/continue context by setting these variables
7475 to some non-null, non-label value. We'll notice and emit the proper
7476 error message in c_finish_bc_stmt. */
7477 c_break_label
= c_cont_label
= size_zero_node
;
7479 decl1
= grokdeclarator (declarator
, declspecs
, FUNCDEF
, true, NULL
,
7480 &attributes
, NULL
, NULL
, DEPRECATED_NORMAL
);
7482 /* If the declarator is not suitable for a function definition,
7483 cause a syntax error. */
7487 loc
= DECL_SOURCE_LOCATION (decl1
);
7489 decl_attributes (&decl1
, attributes
, 0);
7491 if (DECL_DECLARED_INLINE_P (decl1
)
7492 && DECL_UNINLINABLE (decl1
)
7493 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1
)))
7494 warning_at (loc
, OPT_Wattributes
,
7495 "inline function %qD given attribute noinline",
7498 /* Handle gnu_inline attribute. */
7499 if (declspecs
->inline_p
7500 && !flag_gnu89_inline
7501 && TREE_CODE (decl1
) == FUNCTION_DECL
7502 && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl1
))
7503 || current_function_decl
))
7505 if (declspecs
->storage_class
!= csc_static
)
7506 DECL_EXTERNAL (decl1
) = !DECL_EXTERNAL (decl1
);
7509 announce_function (decl1
);
7511 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1
))))
7513 error_at (loc
, "return type is an incomplete type");
7514 /* Make it return void instead. */
7516 = build_function_type (void_type_node
,
7517 TYPE_ARG_TYPES (TREE_TYPE (decl1
)));
7520 if (warn_about_return_type
)
7521 pedwarn_c99 (loc
, flag_isoc99
? 0
7522 : (warn_return_type
? OPT_Wreturn_type
: OPT_Wimplicit_int
),
7523 "return type defaults to %<int%>");
7525 /* Make the init_value nonzero so pushdecl knows this is not tentative.
7526 error_mark_node is replaced below (in pop_scope) with the BLOCK. */
7527 DECL_INITIAL (decl1
) = error_mark_node
;
7529 /* A nested function is not global. */
7530 if (current_function_decl
!= 0)
7531 TREE_PUBLIC (decl1
) = 0;
7533 /* If this definition isn't a prototype and we had a prototype declaration
7534 before, copy the arg type info from that prototype. */
7535 old_decl
= lookup_name_in_scope (DECL_NAME (decl1
), current_scope
);
7536 if (old_decl
&& TREE_CODE (old_decl
) != FUNCTION_DECL
)
7538 current_function_prototype_locus
= UNKNOWN_LOCATION
;
7539 current_function_prototype_built_in
= false;
7540 current_function_prototype_arg_types
= NULL_TREE
;
7541 if (TYPE_ARG_TYPES (TREE_TYPE (decl1
)) == 0)
7543 if (old_decl
!= 0 && TREE_CODE (TREE_TYPE (old_decl
)) == FUNCTION_TYPE
7544 && comptypes (TREE_TYPE (TREE_TYPE (decl1
)),
7545 TREE_TYPE (TREE_TYPE (old_decl
))))
7547 TREE_TYPE (decl1
) = composite_type (TREE_TYPE (old_decl
),
7549 current_function_prototype_locus
= DECL_SOURCE_LOCATION (old_decl
);
7550 current_function_prototype_built_in
7551 = C_DECL_BUILTIN_PROTOTYPE (old_decl
);
7552 current_function_prototype_arg_types
7553 = TYPE_ARG_TYPES (TREE_TYPE (decl1
));
7555 if (TREE_PUBLIC (decl1
))
7557 /* If there is an external prototype declaration of this
7558 function, record its location but do not copy information
7559 to this decl. This may be an invisible declaration
7560 (built-in or in a scope which has finished) or simply
7561 have more refined argument types than any declaration
7563 struct c_binding
*b
;
7564 for (b
= I_SYMBOL_BINDING (DECL_NAME (decl1
)); b
; b
= b
->shadowed
)
7565 if (B_IN_SCOPE (b
, external_scope
))
7569 tree ext_decl
, ext_type
;
7571 ext_type
= b
->u
.type
? b
->u
.type
: TREE_TYPE (ext_decl
);
7572 if (TREE_CODE (ext_type
) == FUNCTION_TYPE
7573 && comptypes (TREE_TYPE (TREE_TYPE (decl1
)),
7574 TREE_TYPE (ext_type
)))
7576 current_function_prototype_locus
7577 = DECL_SOURCE_LOCATION (ext_decl
);
7578 current_function_prototype_built_in
7579 = C_DECL_BUILTIN_PROTOTYPE (ext_decl
);
7580 current_function_prototype_arg_types
7581 = TYPE_ARG_TYPES (ext_type
);
7587 /* Optionally warn of old-fashioned def with no previous prototype. */
7588 if (warn_strict_prototypes
7589 && old_decl
!= error_mark_node
7590 && TYPE_ARG_TYPES (TREE_TYPE (decl1
)) == 0
7591 && C_DECL_ISNT_PROTOTYPE (old_decl
))
7592 warning_at (loc
, OPT_Wstrict_prototypes
,
7593 "function declaration isn%'t a prototype");
7594 /* Optionally warn of any global def with no previous prototype. */
7595 else if (warn_missing_prototypes
7596 && old_decl
!= error_mark_node
7597 && TREE_PUBLIC (decl1
)
7598 && !MAIN_NAME_P (DECL_NAME (decl1
))
7599 && C_DECL_ISNT_PROTOTYPE (old_decl
))
7600 warning_at (loc
, OPT_Wmissing_prototypes
,
7601 "no previous prototype for %qD", decl1
);
7602 /* Optionally warn of any def with no previous prototype
7603 if the function has already been used. */
7604 else if (warn_missing_prototypes
7606 && old_decl
!= error_mark_node
7607 && TREE_USED (old_decl
)
7608 && TYPE_ARG_TYPES (TREE_TYPE (old_decl
)) == 0)
7609 warning_at (loc
, OPT_Wmissing_prototypes
,
7610 "%qD was used with no prototype before its definition", decl1
);
7611 /* Optionally warn of any global def with no previous declaration. */
7612 else if (warn_missing_declarations
7613 && TREE_PUBLIC (decl1
)
7615 && !MAIN_NAME_P (DECL_NAME (decl1
)))
7616 warning_at (loc
, OPT_Wmissing_declarations
,
7617 "no previous declaration for %qD",
7619 /* Optionally warn of any def with no previous declaration
7620 if the function has already been used. */
7621 else if (warn_missing_declarations
7623 && old_decl
!= error_mark_node
7624 && TREE_USED (old_decl
)
7625 && C_DECL_IMPLICIT (old_decl
))
7626 warning_at (loc
, OPT_Wmissing_declarations
,
7627 "%qD was used with no declaration before its definition", decl1
);
7629 /* This function exists in static storage.
7630 (This does not mean `static' in the C sense!) */
7631 TREE_STATIC (decl1
) = 1;
7633 /* This is the earliest point at which we might know the assembler
7634 name of the function. Thus, if it's set before this, die horribly. */
7635 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl1
));
7637 /* If #pragma weak was used, mark the decl weak now. */
7638 if (current_scope
== file_scope
)
7639 maybe_apply_pragma_weak (decl1
);
7641 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
7642 if (warn_main
&& MAIN_NAME_P (DECL_NAME (decl1
)))
7644 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1
)))
7645 != integer_type_node
)
7646 pedwarn (loc
, OPT_Wmain
, "return type of %qD is not %<int%>", decl1
);
7648 check_main_parameter_types (decl1
);
7650 if (!TREE_PUBLIC (decl1
))
7651 pedwarn (loc
, OPT_Wmain
,
7652 "%qD is normally a non-static function", decl1
);
7655 /* Record the decl so that the function name is defined.
7656 If we already have a decl for this name, and it is a FUNCTION_DECL,
7657 use the old decl. */
7659 current_function_decl
= pushdecl (decl1
);
7662 declare_parm_level ();
7664 restype
= TREE_TYPE (TREE_TYPE (current_function_decl
));
7665 resdecl
= build_decl (loc
, RESULT_DECL
, NULL_TREE
, restype
);
7666 DECL_ARTIFICIAL (resdecl
) = 1;
7667 DECL_IGNORED_P (resdecl
) = 1;
7668 DECL_RESULT (current_function_decl
) = resdecl
;
7670 start_fname_decls ();
7675 /* Subroutine of store_parm_decls which handles new-style function
7676 definitions (prototype format). The parms already have decls, so we
7677 need only record them as in effect and complain if any redundant
7678 old-style parm decls were written. */
7680 store_parm_decls_newstyle (tree fndecl
, const struct c_arg_info
*arg_info
)
7686 if (current_scope
->bindings
)
7688 error_at (DECL_SOURCE_LOCATION (fndecl
),
7689 "old-style parameter declarations in prototyped "
7690 "function definition");
7692 /* Get rid of the old-style declarations. */
7696 /* Don't issue this warning for nested functions, and don't issue this
7697 warning if we got here because ARG_INFO_TYPES was error_mark_node
7698 (this happens when a function definition has just an ellipsis in
7699 its parameter list). */
7700 else if (!in_system_header
&& !current_function_scope
7701 && arg_info
->types
!= error_mark_node
)
7702 warning_at (DECL_SOURCE_LOCATION (fndecl
), OPT_Wtraditional
,
7703 "traditional C rejects ISO C style function definitions");
7705 /* Now make all the parameter declarations visible in the function body.
7706 We can bypass most of the grunt work of pushdecl. */
7707 for (decl
= arg_info
->parms
; decl
; decl
= DECL_CHAIN (decl
))
7709 DECL_CONTEXT (decl
) = current_function_decl
;
7710 if (DECL_NAME (decl
))
7712 bind (DECL_NAME (decl
), decl
, current_scope
,
7713 /*invisible=*/false, /*nested=*/false,
7715 if (!TREE_USED (decl
))
7716 warn_if_shadowing (decl
);
7719 error_at (DECL_SOURCE_LOCATION (decl
), "parameter name omitted");
7722 /* Record the parameter list in the function declaration. */
7723 DECL_ARGUMENTS (fndecl
) = arg_info
->parms
;
7725 /* Now make all the ancillary declarations visible, likewise. */
7726 for (decl
= arg_info
->others
; decl
; decl
= DECL_CHAIN (decl
))
7728 DECL_CONTEXT (decl
) = current_function_decl
;
7729 if (DECL_NAME (decl
))
7730 bind (DECL_NAME (decl
), decl
, current_scope
,
7731 /*invisible=*/false,
7732 /*nested=*/(TREE_CODE (decl
) == FUNCTION_DECL
),
7736 /* And all the tag declarations. */
7737 FOR_EACH_VEC_ELT_REVERSE (c_arg_tag
, arg_info
->tags
, ix
, tag
)
7739 bind (tag
->id
, tag
->type
, current_scope
,
7740 /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION
);
7743 /* Subroutine of store_parm_decls which handles old-style function
7744 definitions (separate parameter list and declarations). */
7747 store_parm_decls_oldstyle (tree fndecl
, const struct c_arg_info
*arg_info
)
7749 struct c_binding
*b
;
7750 tree parm
, decl
, last
;
7751 tree parmids
= arg_info
->parms
;
7752 struct pointer_set_t
*seen_args
= pointer_set_create ();
7754 if (!in_system_header
)
7755 warning_at (DECL_SOURCE_LOCATION (fndecl
),
7756 OPT_Wold_style_definition
, "old-style function definition");
7758 /* Match each formal parameter name with its declaration. Save each
7759 decl in the appropriate TREE_PURPOSE slot of the parmids chain. */
7760 for (parm
= parmids
; parm
; parm
= TREE_CHAIN (parm
))
7762 if (TREE_VALUE (parm
) == 0)
7764 error_at (DECL_SOURCE_LOCATION (fndecl
),
7765 "parameter name missing from parameter list");
7766 TREE_PURPOSE (parm
) = 0;
7770 b
= I_SYMBOL_BINDING (TREE_VALUE (parm
));
7771 if (b
&& B_IN_CURRENT_SCOPE (b
))
7774 /* If we got something other than a PARM_DECL it is an error. */
7775 if (TREE_CODE (decl
) != PARM_DECL
)
7776 error_at (DECL_SOURCE_LOCATION (decl
),
7777 "%qD declared as a non-parameter", decl
);
7778 /* If the declaration is already marked, we have a duplicate
7779 name. Complain and ignore the duplicate. */
7780 else if (pointer_set_contains (seen_args
, decl
))
7782 error_at (DECL_SOURCE_LOCATION (decl
),
7783 "multiple parameters named %qD", decl
);
7784 TREE_PURPOSE (parm
) = 0;
7787 /* If the declaration says "void", complain and turn it into
7789 else if (VOID_TYPE_P (TREE_TYPE (decl
)))
7791 error_at (DECL_SOURCE_LOCATION (decl
),
7792 "parameter %qD declared with void type", decl
);
7793 TREE_TYPE (decl
) = integer_type_node
;
7794 DECL_ARG_TYPE (decl
) = integer_type_node
;
7795 layout_decl (decl
, 0);
7797 warn_if_shadowing (decl
);
7799 /* If no declaration found, default to int. */
7802 /* FIXME diagnostics: This should be the location of the argument,
7803 not the FNDECL. E.g., for an old-style declaration
7805 int f10(v) { blah; }
7807 We should use the location of the V, not the F10.
7808 Unfortunately, the V is an IDENTIFIER_NODE which has no
7809 location. In the future we need locations for c_arg_info
7812 See gcc.dg/Wshadow-3.c for an example of this problem. */
7813 decl
= build_decl (DECL_SOURCE_LOCATION (fndecl
),
7814 PARM_DECL
, TREE_VALUE (parm
), integer_type_node
);
7815 DECL_ARG_TYPE (decl
) = TREE_TYPE (decl
);
7817 warn_if_shadowing (decl
);
7820 pedwarn (DECL_SOURCE_LOCATION (decl
),
7821 0, "type of %qD defaults to %<int%>", decl
);
7823 warning_at (DECL_SOURCE_LOCATION (decl
),
7824 OPT_Wmissing_parameter_type
,
7825 "type of %qD defaults to %<int%>", decl
);
7828 TREE_PURPOSE (parm
) = decl
;
7829 pointer_set_insert (seen_args
, decl
);
7832 /* Now examine the parms chain for incomplete declarations
7833 and declarations with no corresponding names. */
7835 for (b
= current_scope
->bindings
; b
; b
= b
->prev
)
7838 if (TREE_CODE (parm
) != PARM_DECL
)
7841 if (TREE_TYPE (parm
) != error_mark_node
7842 && !COMPLETE_TYPE_P (TREE_TYPE (parm
)))
7844 error_at (DECL_SOURCE_LOCATION (parm
),
7845 "parameter %qD has incomplete type", parm
);
7846 TREE_TYPE (parm
) = error_mark_node
;
7849 if (!pointer_set_contains (seen_args
, parm
))
7851 error_at (DECL_SOURCE_LOCATION (parm
),
7852 "declaration for parameter %qD but no such parameter",
7855 /* Pretend the parameter was not missing.
7856 This gets us to a standard state and minimizes
7857 further error messages. */
7858 parmids
= chainon (parmids
, tree_cons (parm
, 0, 0));
7862 /* Chain the declarations together in the order of the list of
7863 names. Store that chain in the function decl, replacing the
7864 list of names. Update the current scope to match. */
7865 DECL_ARGUMENTS (fndecl
) = 0;
7867 for (parm
= parmids
; parm
; parm
= TREE_CHAIN (parm
))
7868 if (TREE_PURPOSE (parm
))
7870 if (parm
&& TREE_PURPOSE (parm
))
7872 last
= TREE_PURPOSE (parm
);
7873 DECL_ARGUMENTS (fndecl
) = last
;
7875 for (parm
= TREE_CHAIN (parm
); parm
; parm
= TREE_CHAIN (parm
))
7876 if (TREE_PURPOSE (parm
))
7878 DECL_CHAIN (last
) = TREE_PURPOSE (parm
);
7879 last
= TREE_PURPOSE (parm
);
7881 DECL_CHAIN (last
) = 0;
7884 pointer_set_destroy (seen_args
);
7886 /* If there was a previous prototype,
7887 set the DECL_ARG_TYPE of each argument according to
7888 the type previously specified, and report any mismatches. */
7890 if (current_function_prototype_arg_types
)
7893 for (parm
= DECL_ARGUMENTS (fndecl
),
7894 type
= current_function_prototype_arg_types
;
7895 parm
|| (type
&& TREE_VALUE (type
) != error_mark_node
7896 && (TYPE_MAIN_VARIANT (TREE_VALUE (type
)) != void_type_node
));
7897 parm
= DECL_CHAIN (parm
), type
= TREE_CHAIN (type
))
7899 if (parm
== 0 || type
== 0
7900 || TYPE_MAIN_VARIANT (TREE_VALUE (type
)) == void_type_node
)
7902 if (current_function_prototype_built_in
)
7903 warning_at (DECL_SOURCE_LOCATION (fndecl
),
7904 0, "number of arguments doesn%'t match "
7905 "built-in prototype");
7908 /* FIXME diagnostics: This should be the location of
7909 FNDECL, but there is bug when a prototype is
7910 declared inside function context, but defined
7911 outside of it (e.g., gcc.dg/pr15698-2.c). In
7912 which case FNDECL gets the location of the
7913 prototype, not the definition. */
7914 error_at (input_location
,
7915 "number of arguments doesn%'t match prototype");
7917 error_at (current_function_prototype_locus
,
7918 "prototype declaration");
7922 /* Type for passing arg must be consistent with that
7923 declared for the arg. ISO C says we take the unqualified
7924 type for parameters declared with qualified type. */
7925 if (TREE_TYPE (parm
) != error_mark_node
7926 && TREE_TYPE (type
) != error_mark_node
7927 && !comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm
)),
7928 TYPE_MAIN_VARIANT (TREE_VALUE (type
))))
7930 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm
))
7931 == TYPE_MAIN_VARIANT (TREE_VALUE (type
)))
7933 /* Adjust argument to match prototype. E.g. a previous
7934 `int foo(float);' prototype causes
7935 `int foo(x) float x; {...}' to be treated like
7936 `int foo(float x) {...}'. This is particularly
7937 useful for argument types like uid_t. */
7938 DECL_ARG_TYPE (parm
) = TREE_TYPE (parm
);
7940 if (targetm
.calls
.promote_prototypes (TREE_TYPE (current_function_decl
))
7941 && INTEGRAL_TYPE_P (TREE_TYPE (parm
))
7942 && TYPE_PRECISION (TREE_TYPE (parm
))
7943 < TYPE_PRECISION (integer_type_node
))
7944 DECL_ARG_TYPE (parm
) = integer_type_node
;
7946 /* ??? Is it possible to get here with a
7947 built-in prototype or will it always have
7948 been diagnosed as conflicting with an
7949 old-style definition and discarded? */
7950 if (current_function_prototype_built_in
)
7951 warning_at (DECL_SOURCE_LOCATION (parm
),
7952 OPT_pedantic
, "promoted argument %qD "
7953 "doesn%'t match built-in prototype", parm
);
7956 pedwarn (DECL_SOURCE_LOCATION (parm
),
7957 OPT_pedantic
, "promoted argument %qD "
7958 "doesn%'t match prototype", parm
);
7959 pedwarn (current_function_prototype_locus
, OPT_pedantic
,
7960 "prototype declaration");
7965 if (current_function_prototype_built_in
)
7966 warning_at (DECL_SOURCE_LOCATION (parm
),
7967 0, "argument %qD doesn%'t match "
7968 "built-in prototype", parm
);
7971 error_at (DECL_SOURCE_LOCATION (parm
),
7972 "argument %qD doesn%'t match prototype", parm
);
7973 error_at (current_function_prototype_locus
,
7974 "prototype declaration");
7979 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl
)) = 0;
7982 /* Otherwise, create a prototype that would match. */
7986 tree actual
= 0, last
= 0, type
;
7988 for (parm
= DECL_ARGUMENTS (fndecl
); parm
; parm
= DECL_CHAIN (parm
))
7990 type
= tree_cons (NULL_TREE
, DECL_ARG_TYPE (parm
), NULL_TREE
);
7992 TREE_CHAIN (last
) = type
;
7997 type
= tree_cons (NULL_TREE
, void_type_node
, NULL_TREE
);
7999 TREE_CHAIN (last
) = type
;
8003 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
8004 of the type of this function, but we need to avoid having this
8005 affect the types of other similarly-typed functions, so we must
8006 first force the generation of an identical (but separate) type
8007 node for the relevant function type. The new node we create
8008 will be a variant of the main variant of the original function
8011 TREE_TYPE (fndecl
) = build_variant_type_copy (TREE_TYPE (fndecl
));
8013 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl
)) = actual
;
8017 /* Store parameter declarations passed in ARG_INFO into the current
8018 function declaration. */
8021 store_parm_decls_from (struct c_arg_info
*arg_info
)
8023 current_function_arg_info
= arg_info
;
8024 store_parm_decls ();
8027 /* Store the parameter declarations into the current function declaration.
8028 This is called after parsing the parameter declarations, before
8029 digesting the body of the function.
8031 For an old-style definition, construct a prototype out of the old-style
8032 parameter declarations and inject it into the function's type. */
8035 store_parm_decls (void)
8037 tree fndecl
= current_function_decl
;
8040 /* The argument information block for FNDECL. */
8041 struct c_arg_info
*arg_info
= current_function_arg_info
;
8042 current_function_arg_info
= 0;
8044 /* True if this definition is written with a prototype. Note:
8045 despite C99 6.7.5.3p14, we can *not* treat an empty argument
8046 list in a function definition as equivalent to (void) -- an
8047 empty argument list specifies the function has no parameters,
8048 but only (void) sets up a prototype for future calls. */
8049 proto
= arg_info
->types
!= 0;
8052 store_parm_decls_newstyle (fndecl
, arg_info
);
8054 store_parm_decls_oldstyle (fndecl
, arg_info
);
8056 /* The next call to push_scope will be a function body. */
8058 next_is_function_body
= true;
8060 /* Write a record describing this function definition to the prototypes
8061 file (if requested). */
8063 gen_aux_info_record (fndecl
, 1, 0, proto
);
8065 /* Initialize the RTL code for the function. */
8066 allocate_struct_function (fndecl
, false);
8068 /* Begin the statement tree for this function. */
8069 DECL_SAVED_TREE (fndecl
) = push_stmt_list ();
8071 /* ??? Insert the contents of the pending sizes list into the function
8072 to be evaluated. The only reason left to have this is
8073 void foo(int n, int array[n++])
8074 because we throw away the array type in favor of a pointer type, and
8075 thus won't naturally see the SAVE_EXPR containing the increment. All
8076 other pending sizes would be handled by gimplify_parameters. */
8078 VEC(tree
,gc
) *pending_sizes
= get_pending_sizes ();
8082 FOR_EACH_VEC_ELT (tree
, pending_sizes
, i
, t
)
8086 /* Even though we're inside a function body, we still don't want to
8087 call expand_expr to calculate the size of a variable-sized array.
8088 We haven't necessarily assigned RTL to all variables yet, so it's
8089 not safe to try to expand expressions involving them. */
8090 cfun
->dont_save_pending_sizes_p
= 1;
8094 /* Finish up a function declaration and compile that function
8095 all the way to assembler language output. Then free the storage
8096 for the function definition.
8098 This is called after parsing the body of the function definition. */
8101 finish_function (void)
8103 tree fndecl
= current_function_decl
;
8105 if (TREE_CODE (fndecl
) == FUNCTION_DECL
8106 && targetm
.calls
.promote_prototypes (TREE_TYPE (fndecl
)))
8108 tree args
= DECL_ARGUMENTS (fndecl
);
8109 for (; args
; args
= DECL_CHAIN (args
))
8111 tree type
= TREE_TYPE (args
);
8112 if (INTEGRAL_TYPE_P (type
)
8113 && TYPE_PRECISION (type
) < TYPE_PRECISION (integer_type_node
))
8114 DECL_ARG_TYPE (args
) = integer_type_node
;
8118 if (DECL_INITIAL (fndecl
) && DECL_INITIAL (fndecl
) != error_mark_node
)
8119 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl
)) = fndecl
;
8121 /* Must mark the RESULT_DECL as being in this function. */
8123 if (DECL_RESULT (fndecl
) && DECL_RESULT (fndecl
) != error_mark_node
)
8124 DECL_CONTEXT (DECL_RESULT (fndecl
)) = fndecl
;
8126 if (MAIN_NAME_P (DECL_NAME (fndecl
)) && flag_hosted
8127 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl
)))
8128 == integer_type_node
&& flag_isoc99
)
8130 /* Hack. We don't want the middle-end to warn that this return
8131 is unreachable, so we mark its location as special. Using
8132 UNKNOWN_LOCATION has the problem that it gets clobbered in
8133 annotate_one_with_locus. A cleaner solution might be to
8134 ensure ! should_carry_locus_p (stmt), but that needs a flag.
8136 c_finish_return (BUILTINS_LOCATION
, integer_zero_node
, NULL_TREE
);
8139 /* Tie off the statement tree for this function. */
8140 DECL_SAVED_TREE (fndecl
) = pop_stmt_list (DECL_SAVED_TREE (fndecl
));
8142 finish_fname_decls ();
8144 /* Complain if there's just no return statement. */
8145 if (warn_return_type
8146 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl
))) != VOID_TYPE
8147 && !current_function_returns_value
&& !current_function_returns_null
8148 /* Don't complain if we are no-return. */
8149 && !current_function_returns_abnormally
8150 /* Don't complain if we are declared noreturn. */
8151 && !TREE_THIS_VOLATILE (fndecl
)
8152 /* Don't warn for main(). */
8153 && !MAIN_NAME_P (DECL_NAME (fndecl
))
8154 /* Or if they didn't actually specify a return type. */
8155 && !C_FUNCTION_IMPLICIT_INT (fndecl
)
8156 /* Normally, with -Wreturn-type, flow will complain, but we might
8157 optimize out static functions. */
8158 && !TREE_PUBLIC (fndecl
))
8160 warning (OPT_Wreturn_type
,
8161 "no return statement in function returning non-void");
8162 TREE_NO_WARNING (fndecl
) = 1;
8165 /* Complain about parameters that are only set, but never otherwise used. */
8166 if (warn_unused_but_set_parameter
)
8170 for (decl
= DECL_ARGUMENTS (fndecl
);
8172 decl
= DECL_CHAIN (decl
))
8173 if (TREE_USED (decl
)
8174 && TREE_CODE (decl
) == PARM_DECL
8175 && !DECL_READ_P (decl
)
8177 && !DECL_ARTIFICIAL (decl
)
8178 && !TREE_NO_WARNING (decl
))
8179 warning_at (DECL_SOURCE_LOCATION (decl
),
8180 OPT_Wunused_but_set_parameter
,
8181 "parameter %qD set but not used", decl
);
8184 /* Store the end of the function, so that we get good line number
8185 info for the epilogue. */
8186 cfun
->function_end_locus
= input_location
;
8188 /* Finalize the ELF visibility for the function. */
8189 c_determine_visibility (fndecl
);
8191 /* For GNU C extern inline functions disregard inline limits. */
8192 if (DECL_EXTERNAL (fndecl
)
8193 && DECL_DECLARED_INLINE_P (fndecl
))
8194 DECL_DISREGARD_INLINE_LIMITS (fndecl
) = 1;
8196 /* Genericize before inlining. Delay genericizing nested functions
8197 until their parent function is genericized. Since finalizing
8198 requires GENERIC, delay that as well. */
8200 if (DECL_INITIAL (fndecl
) && DECL_INITIAL (fndecl
) != error_mark_node
8201 && !undef_nested_function
)
8203 if (!decl_function_context (fndecl
))
8205 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE
, fndecl
);
8206 c_genericize (fndecl
);
8208 /* ??? Objc emits functions after finalizing the compilation unit.
8209 This should be cleaned up later and this conditional removed. */
8210 if (cgraph_global_info_ready
)
8212 cgraph_add_new_function (fndecl
, false);
8215 cgraph_finalize_function (fndecl
, false);
8219 /* Register this function with cgraph just far enough to get it
8220 added to our parent's nested function list. Handy, since the
8221 C front end doesn't have such a list. */
8222 (void) cgraph_node (fndecl
);
8226 if (!decl_function_context (fndecl
))
8227 undef_nested_function
= false;
8229 /* We're leaving the context of this function, so zap cfun.
8230 It's still in DECL_STRUCT_FUNCTION, and we'll restore it in
8231 tree_rest_of_compilation. */
8233 current_function_decl
= NULL
;
8236 /* Check the declarations given in a for-loop for satisfying the C99
8237 constraints. If exactly one such decl is found, return it. LOC is
8238 the location of the opening parenthesis of the for loop. */
8241 check_for_loop_decls (location_t loc
)
8243 struct c_binding
*b
;
8244 tree one_decl
= NULL_TREE
;
8249 static bool hint
= true;
8250 /* If we get here, declarations have been used in a for loop without
8251 the C99 for loop scope. This doesn't make much sense, so don't
8253 error_at (loc
, "%<for%> loop initial declarations "
8254 "are only allowed in C99 mode");
8258 "use option -std=c99 or -std=gnu99 to compile your code");
8263 /* C99 subclause 6.8.5 paragraph 3:
8265 [#3] The declaration part of a for statement shall only
8266 declare identifiers for objects having storage class auto or
8269 It isn't clear whether, in this sentence, "identifiers" binds to
8270 "shall only declare" or to "objects" - that is, whether all identifiers
8271 declared must be identifiers for objects, or whether the restriction
8272 only applies to those that are. (A question on this in comp.std.c
8273 in November 2000 received no answer.) We implement the strictest
8274 interpretation, to avoid creating an extension which later causes
8277 for (b
= current_scope
->bindings
; b
; b
= b
->prev
)
8280 tree decl
= b
->decl
;
8285 switch (TREE_CODE (decl
))
8289 location_t decl_loc
= DECL_SOURCE_LOCATION (decl
);
8290 if (TREE_STATIC (decl
))
8292 "declaration of static variable %qD in %<for%> loop "
8293 "initial declaration", decl
);
8294 else if (DECL_EXTERNAL (decl
))
8296 "declaration of %<extern%> variable %qD in %<for%> loop "
8297 "initial declaration", decl
);
8303 "%<struct %E%> declared in %<for%> loop initial "
8308 "%<union %E%> declared in %<for%> loop initial declaration",
8312 error_at (loc
, "%<enum %E%> declared in %<for%> loop "
8313 "initial declaration", id
);
8316 error_at (loc
, "declaration of non-variable "
8317 "%qD in %<for%> loop initial declaration", decl
);
8324 return n_decls
== 1 ? one_decl
: NULL_TREE
;
8327 /* Save and reinitialize the variables
8328 used during compilation of a C function. */
8331 c_push_function_context (void)
8333 struct language_function
*p
;
8334 p
= ggc_alloc_language_function ();
8337 p
->base
.x_stmt_tree
= c_stmt_tree
;
8338 p
->x_break_label
= c_break_label
;
8339 p
->x_cont_label
= c_cont_label
;
8340 p
->x_switch_stack
= c_switch_stack
;
8341 p
->arg_info
= current_function_arg_info
;
8342 p
->returns_value
= current_function_returns_value
;
8343 p
->returns_null
= current_function_returns_null
;
8344 p
->returns_abnormally
= current_function_returns_abnormally
;
8345 p
->warn_about_return_type
= warn_about_return_type
;
8347 push_function_context ();
8350 /* Restore the variables used during compilation of a C function. */
8353 c_pop_function_context (void)
8355 struct language_function
*p
;
8357 pop_function_context ();
8359 cfun
->language
= NULL
;
8361 if (DECL_STRUCT_FUNCTION (current_function_decl
) == 0
8362 && DECL_SAVED_TREE (current_function_decl
) == NULL_TREE
)
8364 /* Stop pointing to the local nodes about to be freed. */
8365 /* But DECL_INITIAL must remain nonzero so we know this
8366 was an actual function definition. */
8367 DECL_INITIAL (current_function_decl
) = error_mark_node
;
8368 DECL_ARGUMENTS (current_function_decl
) = 0;
8371 c_stmt_tree
= p
->base
.x_stmt_tree
;
8372 c_break_label
= p
->x_break_label
;
8373 c_cont_label
= p
->x_cont_label
;
8374 c_switch_stack
= p
->x_switch_stack
;
8375 current_function_arg_info
= p
->arg_info
;
8376 current_function_returns_value
= p
->returns_value
;
8377 current_function_returns_null
= p
->returns_null
;
8378 current_function_returns_abnormally
= p
->returns_abnormally
;
8379 warn_about_return_type
= p
->warn_about_return_type
;
8382 /* The functions below are required for functionality of doing
8383 function at once processing in the C front end. Currently these
8384 functions are not called from anywhere in the C front end, but as
8385 these changes continue, that will change. */
8387 /* Returns the stmt_tree (if any) to which statements are currently
8388 being added. If there is no active statement-tree, NULL is
8392 current_stmt_tree (void)
8394 return &c_stmt_tree
;
8397 /* Return the global value of T as a symbol. */
8400 identifier_global_value (tree t
)
8402 struct c_binding
*b
;
8404 for (b
= I_SYMBOL_BINDING (t
); b
; b
= b
->shadowed
)
8405 if (B_IN_FILE_SCOPE (b
) || B_IN_EXTERNAL_SCOPE (b
))
8411 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
8412 otherwise the name is found in ridpointers from RID_INDEX. */
8415 record_builtin_type (enum rid rid_index
, const char *name
, tree type
)
8419 id
= ridpointers
[(int) rid_index
];
8421 id
= get_identifier (name
);
8422 decl
= build_decl (UNKNOWN_LOCATION
, TYPE_DECL
, id
, type
);
8424 if (debug_hooks
->type_decl
)
8425 debug_hooks
->type_decl (decl
, false);
8428 /* Build the void_list_node (void_type_node having been created). */
8430 build_void_list_node (void)
8432 tree t
= build_tree_list (NULL_TREE
, void_type_node
);
8436 /* Return a c_parm structure with the given SPECS, ATTRS and DECLARATOR. */
8439 build_c_parm (struct c_declspecs
*specs
, tree attrs
,
8440 struct c_declarator
*declarator
)
8442 struct c_parm
*ret
= XOBNEW (&parser_obstack
, struct c_parm
);
8445 ret
->declarator
= declarator
;
8449 /* Return a declarator with nested attributes. TARGET is the inner
8450 declarator to which these attributes apply. ATTRS are the
8453 struct c_declarator
*
8454 build_attrs_declarator (tree attrs
, struct c_declarator
*target
)
8456 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
8457 ret
->kind
= cdk_attrs
;
8458 ret
->declarator
= target
;
8459 ret
->u
.attrs
= attrs
;
8463 /* Return a declarator for a function with arguments specified by ARGS
8464 and return type specified by TARGET. */
8466 struct c_declarator
*
8467 build_function_declarator (struct c_arg_info
*args
,
8468 struct c_declarator
*target
)
8470 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
8471 ret
->kind
= cdk_function
;
8472 ret
->declarator
= target
;
8473 ret
->u
.arg_info
= args
;
8477 /* Return a declarator for the identifier IDENT (which may be
8478 NULL_TREE for an abstract declarator). */
8480 struct c_declarator
*
8481 build_id_declarator (tree ident
)
8483 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
8485 ret
->declarator
= 0;
8487 /* Default value - may get reset to a more precise location. */
8488 ret
->id_loc
= input_location
;
8492 /* Return something to represent absolute declarators containing a *.
8493 TARGET is the absolute declarator that the * contains.
8494 TYPE_QUALS_ATTRS is a structure for type qualifiers and attributes
8495 to apply to the pointer type. */
8497 struct c_declarator
*
8498 make_pointer_declarator (struct c_declspecs
*type_quals_attrs
,
8499 struct c_declarator
*target
)
8503 struct c_declarator
*itarget
= target
;
8504 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
8505 if (type_quals_attrs
)
8507 attrs
= type_quals_attrs
->attrs
;
8508 quals
= quals_from_declspecs (type_quals_attrs
);
8509 if (attrs
!= NULL_TREE
)
8510 itarget
= build_attrs_declarator (attrs
, target
);
8512 ret
->kind
= cdk_pointer
;
8513 ret
->declarator
= itarget
;
8514 ret
->u
.pointer_quals
= quals
;
8518 /* Return a pointer to a structure for an empty list of declaration
8521 struct c_declspecs
*
8522 build_null_declspecs (void)
8524 struct c_declspecs
*ret
= XOBNEW (&parser_obstack
, struct c_declspecs
);
8529 ret
->typespec_word
= cts_none
;
8530 ret
->storage_class
= csc_none
;
8531 ret
->expr_const_operands
= true;
8532 ret
->declspecs_seen_p
= false;
8533 ret
->type_seen_p
= false;
8534 ret
->non_sc_seen_p
= false;
8535 ret
->typedef_p
= false;
8536 ret
->tag_defined_p
= false;
8537 ret
->explicit_signed_p
= false;
8538 ret
->deprecated_p
= false;
8539 ret
->default_int_p
= false;
8540 ret
->long_p
= false;
8541 ret
->long_long_p
= false;
8542 ret
->short_p
= false;
8543 ret
->signed_p
= false;
8544 ret
->unsigned_p
= false;
8545 ret
->complex_p
= false;
8546 ret
->inline_p
= false;
8547 ret
->thread_p
= false;
8548 ret
->const_p
= false;
8549 ret
->volatile_p
= false;
8550 ret
->restrict_p
= false;
8551 ret
->saturating_p
= false;
8552 ret
->address_space
= ADDR_SPACE_GENERIC
;
8556 /* Add the address space ADDRSPACE to the declaration specifiers
8557 SPECS, returning SPECS. */
8559 struct c_declspecs
*
8560 declspecs_add_addrspace (struct c_declspecs
*specs
, addr_space_t as
)
8562 specs
->non_sc_seen_p
= true;
8563 specs
->declspecs_seen_p
= true;
8565 if (!ADDR_SPACE_GENERIC_P (specs
->address_space
)
8566 && specs
->address_space
!= as
)
8567 error ("incompatible address space qualifiers %qs and %qs",
8568 c_addr_space_name (as
),
8569 c_addr_space_name (specs
->address_space
));
8571 specs
->address_space
= as
;
8575 /* Add the type qualifier QUAL to the declaration specifiers SPECS,
8578 struct c_declspecs
*
8579 declspecs_add_qual (struct c_declspecs
*specs
, tree qual
)
8583 specs
->non_sc_seen_p
= true;
8584 specs
->declspecs_seen_p
= true;
8585 gcc_assert (TREE_CODE (qual
) == IDENTIFIER_NODE
8586 && C_IS_RESERVED_WORD (qual
));
8587 i
= C_RID_CODE (qual
);
8591 dupe
= specs
->const_p
;
8592 specs
->const_p
= true;
8595 dupe
= specs
->volatile_p
;
8596 specs
->volatile_p
= true;
8599 dupe
= specs
->restrict_p
;
8600 specs
->restrict_p
= true;
8605 if (dupe
&& !flag_isoc99
)
8606 pedwarn (input_location
, OPT_pedantic
, "duplicate %qE", qual
);
8610 /* Add the type specifier TYPE to the declaration specifiers SPECS,
8613 struct c_declspecs
*
8614 declspecs_add_type (location_t loc
, struct c_declspecs
*specs
,
8615 struct c_typespec spec
)
8617 tree type
= spec
.spec
;
8618 specs
->non_sc_seen_p
= true;
8619 specs
->declspecs_seen_p
= true;
8620 specs
->type_seen_p
= true;
8621 if (TREE_DEPRECATED (type
))
8622 specs
->deprecated_p
= true;
8624 /* Handle type specifier keywords. */
8625 if (TREE_CODE (type
) == IDENTIFIER_NODE
8626 && C_IS_RESERVED_WORD (type
)
8627 && C_RID_CODE (type
) != RID_CXX_COMPAT_WARN
)
8629 enum rid i
= C_RID_CODE (type
);
8632 error_at (loc
, "two or more data types in declaration specifiers");
8635 if ((int) i
<= (int) RID_LAST_MODIFIER
)
8637 /* "long", "short", "signed", "unsigned", "_Complex" or "_Sat". */
8642 if (specs
->long_long_p
)
8644 error_at (loc
, "%<long long long%> is too long for GCC");
8649 if (specs
->typespec_word
== cts_double
)
8652 ("both %<long long%> and %<double%> in "
8653 "declaration specifiers"));
8656 pedwarn_c90 (loc
, OPT_Wlong_long
,
8657 "ISO C90 does not support %<long long%>");
8658 specs
->long_long_p
= 1;
8663 ("both %<long%> and %<short%> in "
8664 "declaration specifiers"));
8665 else if (specs
->typespec_word
== cts_void
)
8667 ("both %<long%> and %<void%> in "
8668 "declaration specifiers"));
8669 else if (specs
->typespec_word
== cts_int128
)
8671 ("both %<long%> and %<__int128%> in "
8672 "declaration specifiers"));
8673 else if (specs
->typespec_word
== cts_bool
)
8675 ("both %<long%> and %<_Bool%> in "
8676 "declaration specifiers"));
8677 else if (specs
->typespec_word
== cts_char
)
8679 ("both %<long%> and %<char%> in "
8680 "declaration specifiers"));
8681 else if (specs
->typespec_word
== cts_float
)
8683 ("both %<long%> and %<float%> in "
8684 "declaration specifiers"));
8685 else if (specs
->typespec_word
== cts_dfloat32
)
8687 ("both %<long%> and %<_Decimal32%> in "
8688 "declaration specifiers"));
8689 else if (specs
->typespec_word
== cts_dfloat64
)
8691 ("both %<long%> and %<_Decimal64%> in "
8692 "declaration specifiers"));
8693 else if (specs
->typespec_word
== cts_dfloat128
)
8695 ("both %<long%> and %<_Decimal128%> in "
8696 "declaration specifiers"));
8698 specs
->long_p
= true;
8701 dupe
= specs
->short_p
;
8704 ("both %<long%> and %<short%> in "
8705 "declaration specifiers"));
8706 else if (specs
->typespec_word
== cts_void
)
8708 ("both %<short%> and %<void%> in "
8709 "declaration specifiers"));
8710 else if (specs
->typespec_word
== cts_int128
)
8712 ("both %<short%> and %<__int128%> in "
8713 "declaration specifiers"));
8714 else if (specs
->typespec_word
== cts_bool
)
8716 ("both %<short%> and %<_Bool%> in "
8717 "declaration specifiers"));
8718 else if (specs
->typespec_word
== cts_char
)
8720 ("both %<short%> and %<char%> in "
8721 "declaration specifiers"));
8722 else if (specs
->typespec_word
== cts_float
)
8724 ("both %<short%> and %<float%> in "
8725 "declaration specifiers"));
8726 else if (specs
->typespec_word
== cts_double
)
8728 ("both %<short%> and %<double%> in "
8729 "declaration specifiers"));
8730 else if (specs
->typespec_word
== cts_dfloat32
)
8732 ("both %<short%> and %<_Decimal32%> in "
8733 "declaration specifiers"));
8734 else if (specs
->typespec_word
== cts_dfloat64
)
8736 ("both %<short%> and %<_Decimal64%> in "
8737 "declaration specifiers"));
8738 else if (specs
->typespec_word
== cts_dfloat128
)
8740 ("both %<short%> and %<_Decimal128%> in "
8741 "declaration specifiers"));
8743 specs
->short_p
= true;
8746 dupe
= specs
->signed_p
;
8747 if (specs
->unsigned_p
)
8749 ("both %<signed%> and %<unsigned%> in "
8750 "declaration specifiers"));
8751 else if (specs
->typespec_word
== cts_void
)
8753 ("both %<signed%> and %<void%> in "
8754 "declaration specifiers"));
8755 else if (specs
->typespec_word
== cts_bool
)
8757 ("both %<signed%> and %<_Bool%> in "
8758 "declaration specifiers"));
8759 else if (specs
->typespec_word
== cts_float
)
8761 ("both %<signed%> and %<float%> in "
8762 "declaration specifiers"));
8763 else if (specs
->typespec_word
== cts_double
)
8765 ("both %<signed%> and %<double%> in "
8766 "declaration specifiers"));
8767 else if (specs
->typespec_word
== cts_dfloat32
)
8769 ("both %<signed%> and %<_Decimal32%> in "
8770 "declaration specifiers"));
8771 else if (specs
->typespec_word
== cts_dfloat64
)
8773 ("both %<signed%> and %<_Decimal64%> in "
8774 "declaration specifiers"));
8775 else if (specs
->typespec_word
== cts_dfloat128
)
8777 ("both %<signed%> and %<_Decimal128%> in "
8778 "declaration specifiers"));
8780 specs
->signed_p
= true;
8783 dupe
= specs
->unsigned_p
;
8784 if (specs
->signed_p
)
8786 ("both %<signed%> and %<unsigned%> in "
8787 "declaration specifiers"));
8788 else if (specs
->typespec_word
== cts_void
)
8790 ("both %<unsigned%> and %<void%> in "
8791 "declaration specifiers"));
8792 else if (specs
->typespec_word
== cts_bool
)
8794 ("both %<unsigned%> and %<_Bool%> in "
8795 "declaration specifiers"));
8796 else if (specs
->typespec_word
== cts_float
)
8798 ("both %<unsigned%> and %<float%> in "
8799 "declaration specifiers"));
8800 else if (specs
->typespec_word
== cts_double
)
8802 ("both %<unsigned%> and %<double%> in "
8803 "declaration specifiers"));
8804 else if (specs
->typespec_word
== cts_dfloat32
)
8806 ("both %<unsigned%> and %<_Decimal32%> in "
8807 "declaration specifiers"));
8808 else if (specs
->typespec_word
== cts_dfloat64
)
8810 ("both %<unsigned%> and %<_Decimal64%> in "
8811 "declaration specifiers"));
8812 else if (specs
->typespec_word
== cts_dfloat128
)
8814 ("both %<unsigned%> and %<_Decimal128%> in "
8815 "declaration specifiers"));
8817 specs
->unsigned_p
= true;
8820 dupe
= specs
->complex_p
;
8821 if (!flag_isoc99
&& !in_system_header
)
8822 pedwarn (loc
, OPT_pedantic
,
8823 "ISO C90 does not support complex types");
8824 if (specs
->typespec_word
== cts_void
)
8826 ("both %<complex%> and %<void%> in "
8827 "declaration specifiers"));
8828 else if (specs
->typespec_word
== cts_bool
)
8830 ("both %<complex%> and %<_Bool%> in "
8831 "declaration specifiers"));
8832 else if (specs
->typespec_word
== cts_dfloat32
)
8834 ("both %<complex%> and %<_Decimal32%> in "
8835 "declaration specifiers"));
8836 else if (specs
->typespec_word
== cts_dfloat64
)
8838 ("both %<complex%> and %<_Decimal64%> in "
8839 "declaration specifiers"));
8840 else if (specs
->typespec_word
== cts_dfloat128
)
8842 ("both %<complex%> and %<_Decimal128%> in "
8843 "declaration specifiers"));
8844 else if (specs
->typespec_word
== cts_fract
)
8846 ("both %<complex%> and %<_Fract%> in "
8847 "declaration specifiers"));
8848 else if (specs
->typespec_word
== cts_accum
)
8850 ("both %<complex%> and %<_Accum%> in "
8851 "declaration specifiers"));
8852 else if (specs
->saturating_p
)
8854 ("both %<complex%> and %<_Sat%> in "
8855 "declaration specifiers"));
8857 specs
->complex_p
= true;
8860 dupe
= specs
->saturating_p
;
8861 pedwarn (loc
, OPT_pedantic
,
8862 "ISO C does not support saturating types");
8863 if (specs
->typespec_word
== cts_int128
)
8866 ("both %<_Sat%> and %<__int128%> in "
8867 "declaration specifiers"));
8869 else if (specs
->typespec_word
== cts_void
)
8871 ("both %<_Sat%> and %<void%> in "
8872 "declaration specifiers"));
8873 else if (specs
->typespec_word
== cts_bool
)
8875 ("both %<_Sat%> and %<_Bool%> in "
8876 "declaration specifiers"));
8877 else if (specs
->typespec_word
== cts_char
)
8879 ("both %<_Sat%> and %<char%> in "
8880 "declaration specifiers"));
8881 else if (specs
->typespec_word
== cts_int
)
8883 ("both %<_Sat%> and %<int%> in "
8884 "declaration specifiers"));
8885 else if (specs
->typespec_word
== cts_float
)
8887 ("both %<_Sat%> and %<float%> in "
8888 "declaration specifiers"));
8889 else if (specs
->typespec_word
== cts_double
)
8891 ("both %<_Sat%> and %<double%> in "
8892 "declaration specifiers"));
8893 else if (specs
->typespec_word
== cts_dfloat32
)
8895 ("both %<_Sat%> and %<_Decimal32%> in "
8896 "declaration specifiers"));
8897 else if (specs
->typespec_word
== cts_dfloat64
)
8899 ("both %<_Sat%> and %<_Decimal64%> in "
8900 "declaration specifiers"));
8901 else if (specs
->typespec_word
== cts_dfloat128
)
8903 ("both %<_Sat%> and %<_Decimal128%> in "
8904 "declaration specifiers"));
8905 else if (specs
->complex_p
)
8907 ("both %<_Sat%> and %<complex%> in "
8908 "declaration specifiers"));
8910 specs
->saturating_p
= true;
8917 error_at (loc
, "duplicate %qE", type
);
8923 /* "void", "_Bool", "char", "int", "float", "double", "_Decimal32",
8924 "__int128", "_Decimal64", "_Decimal128", "_Fract" or "_Accum". */
8925 if (specs
->typespec_word
!= cts_none
)
8928 "two or more data types in declaration specifiers");
8934 if (int128_integer_type_node
== NULL_TREE
)
8936 error_at (loc
, "%<__int128%> is not supported for this target");
8939 if (!in_system_header
)
8940 pedwarn (loc
, OPT_pedantic
,
8941 "ISO C does not support %<__int128%> type");
8945 ("both %<__int128%> and %<long%> in "
8946 "declaration specifiers"));
8947 else if (specs
->saturating_p
)
8949 ("both %<_Sat%> and %<__int128%> in "
8950 "declaration specifiers"));
8951 else if (specs
->short_p
)
8953 ("both %<__int128%> and %<short%> in "
8954 "declaration specifiers"));
8956 specs
->typespec_word
= cts_int128
;
8961 ("both %<long%> and %<void%> in "
8962 "declaration specifiers"));
8963 else if (specs
->short_p
)
8965 ("both %<short%> and %<void%> in "
8966 "declaration specifiers"));
8967 else if (specs
->signed_p
)
8969 ("both %<signed%> and %<void%> in "
8970 "declaration specifiers"));
8971 else if (specs
->unsigned_p
)
8973 ("both %<unsigned%> and %<void%> in "
8974 "declaration specifiers"));
8975 else if (specs
->complex_p
)
8977 ("both %<complex%> and %<void%> in "
8978 "declaration specifiers"));
8979 else if (specs
->saturating_p
)
8981 ("both %<_Sat%> and %<void%> in "
8982 "declaration specifiers"));
8984 specs
->typespec_word
= cts_void
;
8989 ("both %<long%> and %<_Bool%> in "
8990 "declaration specifiers"));
8991 else if (specs
->short_p
)
8993 ("both %<short%> and %<_Bool%> in "
8994 "declaration specifiers"));
8995 else if (specs
->signed_p
)
8997 ("both %<signed%> and %<_Bool%> in "
8998 "declaration specifiers"));
8999 else if (specs
->unsigned_p
)
9001 ("both %<unsigned%> and %<_Bool%> in "
9002 "declaration specifiers"));
9003 else if (specs
->complex_p
)
9005 ("both %<complex%> and %<_Bool%> in "
9006 "declaration specifiers"));
9007 else if (specs
->saturating_p
)
9009 ("both %<_Sat%> and %<_Bool%> in "
9010 "declaration specifiers"));
9012 specs
->typespec_word
= cts_bool
;
9017 ("both %<long%> and %<char%> in "
9018 "declaration specifiers"));
9019 else if (specs
->short_p
)
9021 ("both %<short%> and %<char%> in "
9022 "declaration specifiers"));
9023 else if (specs
->saturating_p
)
9025 ("both %<_Sat%> and %<char%> in "
9026 "declaration specifiers"));
9028 specs
->typespec_word
= cts_char
;
9031 if (specs
->saturating_p
)
9033 ("both %<_Sat%> and %<int%> in "
9034 "declaration specifiers"));
9036 specs
->typespec_word
= cts_int
;
9041 ("both %<long%> and %<float%> in "
9042 "declaration specifiers"));
9043 else if (specs
->short_p
)
9045 ("both %<short%> and %<float%> in "
9046 "declaration specifiers"));
9047 else if (specs
->signed_p
)
9049 ("both %<signed%> and %<float%> in "
9050 "declaration specifiers"));
9051 else if (specs
->unsigned_p
)
9053 ("both %<unsigned%> and %<float%> in "
9054 "declaration specifiers"));
9055 else if (specs
->saturating_p
)
9057 ("both %<_Sat%> and %<float%> in "
9058 "declaration specifiers"));
9060 specs
->typespec_word
= cts_float
;
9063 if (specs
->long_long_p
)
9065 ("both %<long long%> and %<double%> in "
9066 "declaration specifiers"));
9067 else if (specs
->short_p
)
9069 ("both %<short%> and %<double%> in "
9070 "declaration specifiers"));
9071 else if (specs
->signed_p
)
9073 ("both %<signed%> and %<double%> in "
9074 "declaration specifiers"));
9075 else if (specs
->unsigned_p
)
9077 ("both %<unsigned%> and %<double%> in "
9078 "declaration specifiers"));
9079 else if (specs
->saturating_p
)
9081 ("both %<_Sat%> and %<double%> in "
9082 "declaration specifiers"));
9084 specs
->typespec_word
= cts_double
;
9091 if (i
== RID_DFLOAT32
)
9093 else if (i
== RID_DFLOAT64
)
9096 str
= "_Decimal128";
9097 if (specs
->long_long_p
)
9099 ("both %<long long%> and %<%s%> in "
9100 "declaration specifiers"),
9104 ("both %<long%> and %<%s%> in "
9105 "declaration specifiers"),
9107 else if (specs
->short_p
)
9109 ("both %<short%> and %<%s%> in "
9110 "declaration specifiers"),
9112 else if (specs
->signed_p
)
9114 ("both %<signed%> and %<%s%> in "
9115 "declaration specifiers"),
9117 else if (specs
->unsigned_p
)
9119 ("both %<unsigned%> and %<%s%> in "
9120 "declaration specifiers"),
9122 else if (specs
->complex_p
)
9124 ("both %<complex%> and %<%s%> in "
9125 "declaration specifiers"),
9127 else if (specs
->saturating_p
)
9129 ("both %<_Sat%> and %<%s%> in "
9130 "declaration specifiers"),
9132 else if (i
== RID_DFLOAT32
)
9133 specs
->typespec_word
= cts_dfloat32
;
9134 else if (i
== RID_DFLOAT64
)
9135 specs
->typespec_word
= cts_dfloat64
;
9137 specs
->typespec_word
= cts_dfloat128
;
9139 if (!targetm
.decimal_float_supported_p ())
9141 ("decimal floating point not supported "
9142 "for this target"));
9143 pedwarn (loc
, OPT_pedantic
,
9144 "ISO C does not support decimal floating point");
9154 if (specs
->complex_p
)
9156 ("both %<complex%> and %<%s%> in "
9157 "declaration specifiers"),
9159 else if (i
== RID_FRACT
)
9160 specs
->typespec_word
= cts_fract
;
9162 specs
->typespec_word
= cts_accum
;
9164 if (!targetm
.fixed_point_supported_p ())
9166 "fixed-point types not supported for this target");
9167 pedwarn (loc
, OPT_pedantic
,
9168 "ISO C does not support fixed-point types");
9171 /* ObjC reserved word "id", handled below. */
9177 /* Now we have a typedef (a TYPE_DECL node), an identifier (some
9178 form of ObjC type, cases such as "int" and "long" being handled
9179 above), a TYPE (struct, union, enum and typeof specifiers) or an
9180 ERROR_MARK. In none of these cases may there have previously
9181 been any type specifiers. */
9182 if (specs
->type
|| specs
->typespec_word
!= cts_none
9183 || specs
->long_p
|| specs
->short_p
|| specs
->signed_p
9184 || specs
->unsigned_p
|| specs
->complex_p
)
9185 error_at (loc
, "two or more data types in declaration specifiers");
9186 else if (TREE_CODE (type
) == TYPE_DECL
)
9188 if (TREE_TYPE (type
) == error_mark_node
)
9189 ; /* Allow the type to default to int to avoid cascading errors. */
9192 specs
->type
= TREE_TYPE (type
);
9193 specs
->decl_attr
= DECL_ATTRIBUTES (type
);
9194 specs
->typedef_p
= true;
9195 specs
->explicit_signed_p
= C_TYPEDEF_EXPLICITLY_SIGNED (type
);
9197 /* If this typedef name is defined in a struct, then a C++
9198 lookup would return a different value. */
9200 && I_SYMBOL_BINDING (DECL_NAME (type
))->in_struct
)
9201 warning_at (loc
, OPT_Wc___compat
,
9202 "C++ lookup of %qD would return a field, not a type",
9205 /* If we are parsing a struct, record that a struct field
9207 if (warn_cxx_compat
&& struct_parse_info
!= NULL
)
9208 VEC_safe_push (tree
, heap
, struct_parse_info
->typedefs_seen
, type
);
9211 else if (TREE_CODE (type
) == IDENTIFIER_NODE
)
9213 tree t
= lookup_name (type
);
9214 if (!t
|| TREE_CODE (t
) != TYPE_DECL
)
9215 error_at (loc
, "%qE fails to be a typedef or built in type", type
);
9216 else if (TREE_TYPE (t
) == error_mark_node
)
9219 specs
->type
= TREE_TYPE (t
);
9221 else if (TREE_CODE (type
) != ERROR_MARK
)
9223 if (spec
.kind
== ctsk_tagdef
|| spec
.kind
== ctsk_tagfirstref
)
9224 specs
->tag_defined_p
= true;
9225 if (spec
.kind
== ctsk_typeof
)
9227 specs
->typedef_p
= true;
9231 specs
->expr
= build2 (COMPOUND_EXPR
, TREE_TYPE (spec
.expr
),
9232 specs
->expr
, spec
.expr
);
9234 specs
->expr
= spec
.expr
;
9235 specs
->expr_const_operands
&= spec
.expr_const_operands
;
9244 /* Add the storage class specifier or function specifier SCSPEC to the
9245 declaration specifiers SPECS, returning SPECS. */
9247 struct c_declspecs
*
9248 declspecs_add_scspec (struct c_declspecs
*specs
, tree scspec
)
9251 enum c_storage_class n
= csc_none
;
9253 specs
->declspecs_seen_p
= true;
9254 gcc_assert (TREE_CODE (scspec
) == IDENTIFIER_NODE
9255 && C_IS_RESERVED_WORD (scspec
));
9256 i
= C_RID_CODE (scspec
);
9257 if (specs
->non_sc_seen_p
)
9258 warning (OPT_Wold_style_declaration
,
9259 "%qE is not at beginning of declaration", scspec
);
9263 /* C99 permits duplicate inline. Although of doubtful utility,
9264 it seems simplest to permit it in gnu89 mode as well, as
9265 there is also little utility in maintaining this as a
9266 difference between gnu89 and C99 inline. */
9268 specs
->inline_p
= true;
9271 dupe
= specs
->thread_p
;
9272 if (specs
->storage_class
== csc_auto
)
9273 error ("%<__thread%> used with %<auto%>");
9274 else if (specs
->storage_class
== csc_register
)
9275 error ("%<__thread%> used with %<register%>");
9276 else if (specs
->storage_class
== csc_typedef
)
9277 error ("%<__thread%> used with %<typedef%>");
9279 specs
->thread_p
= true;
9286 /* Diagnose "__thread extern". */
9287 if (specs
->thread_p
)
9288 error ("%<__thread%> before %<extern%>");
9295 /* Diagnose "__thread static". */
9296 if (specs
->thread_p
)
9297 error ("%<__thread%> before %<static%>");
9305 if (n
!= csc_none
&& n
== specs
->storage_class
)
9308 error ("duplicate %qE", scspec
);
9311 if (specs
->storage_class
!= csc_none
&& n
!= specs
->storage_class
)
9313 error ("multiple storage classes in declaration specifiers");
9317 specs
->storage_class
= n
;
9318 if (n
!= csc_extern
&& n
!= csc_static
&& specs
->thread_p
)
9320 error ("%<__thread%> used with %qE", scspec
);
9321 specs
->thread_p
= false;
9328 /* Add the attributes ATTRS to the declaration specifiers SPECS,
9331 struct c_declspecs
*
9332 declspecs_add_attrs (struct c_declspecs
*specs
, tree attrs
)
9334 specs
->attrs
= chainon (attrs
, specs
->attrs
);
9335 specs
->declspecs_seen_p
= true;
9339 /* Combine "long", "short", "signed", "unsigned" and "_Complex" type
9340 specifiers with any other type specifier to determine the resulting
9341 type. This is where ISO C checks on complex types are made, since
9342 "_Complex long" is a prefix of the valid ISO C type "_Complex long
9345 struct c_declspecs
*
9346 finish_declspecs (struct c_declspecs
*specs
)
9348 /* If a type was specified as a whole, we have no modifiers and are
9350 if (specs
->type
!= NULL_TREE
)
9352 gcc_assert (!specs
->long_p
&& !specs
->long_long_p
&& !specs
->short_p
9353 && !specs
->signed_p
&& !specs
->unsigned_p
9354 && !specs
->complex_p
);
9358 /* If none of "void", "_Bool", "char", "int", "float" or "double"
9359 has been specified, treat it as "int" unless "_Complex" is
9360 present and there are no other specifiers. If we just have
9361 "_Complex", it is equivalent to "_Complex double", but e.g.
9362 "_Complex short" is equivalent to "_Complex short int". */
9363 if (specs
->typespec_word
== cts_none
)
9365 if (specs
->saturating_p
)
9367 error ("%<_Sat%> is used without %<_Fract%> or %<_Accum%>");
9368 if (!targetm
.fixed_point_supported_p ())
9369 error ("fixed-point types not supported for this target");
9370 specs
->typespec_word
= cts_fract
;
9372 else if (specs
->long_p
|| specs
->short_p
9373 || specs
->signed_p
|| specs
->unsigned_p
)
9375 specs
->typespec_word
= cts_int
;
9377 else if (specs
->complex_p
)
9379 specs
->typespec_word
= cts_double
;
9380 pedwarn (input_location
, OPT_pedantic
,
9381 "ISO C does not support plain %<complex%> meaning "
9382 "%<double complex%>");
9386 specs
->typespec_word
= cts_int
;
9387 specs
->default_int_p
= true;
9388 /* We don't diagnose this here because grokdeclarator will
9389 give more specific diagnostics according to whether it is
9390 a function definition. */
9394 /* If "signed" was specified, record this to distinguish "int" and
9395 "signed int" in the case of a bit-field with
9396 -funsigned-bitfields. */
9397 specs
->explicit_signed_p
= specs
->signed_p
;
9399 /* Now compute the actual type. */
9400 switch (specs
->typespec_word
)
9403 gcc_assert (!specs
->long_p
&& !specs
->short_p
9404 && !specs
->signed_p
&& !specs
->unsigned_p
9405 && !specs
->complex_p
);
9406 specs
->type
= void_type_node
;
9409 gcc_assert (!specs
->long_p
&& !specs
->short_p
9410 && !specs
->signed_p
&& !specs
->unsigned_p
9411 && !specs
->complex_p
);
9412 specs
->type
= boolean_type_node
;
9415 gcc_assert (!specs
->long_p
&& !specs
->short_p
);
9416 gcc_assert (!(specs
->signed_p
&& specs
->unsigned_p
));
9417 if (specs
->signed_p
)
9418 specs
->type
= signed_char_type_node
;
9419 else if (specs
->unsigned_p
)
9420 specs
->type
= unsigned_char_type_node
;
9422 specs
->type
= char_type_node
;
9423 if (specs
->complex_p
)
9425 pedwarn (input_location
, OPT_pedantic
,
9426 "ISO C does not support complex integer types");
9427 specs
->type
= build_complex_type (specs
->type
);
9431 gcc_assert (!specs
->long_p
&& !specs
->short_p
&& !specs
->long_long_p
);
9432 gcc_assert (!(specs
->signed_p
&& specs
->unsigned_p
));
9433 specs
->type
= (specs
->unsigned_p
9434 ? int128_unsigned_type_node
9435 : int128_integer_type_node
);
9436 if (specs
->complex_p
)
9438 pedwarn (input_location
, OPT_pedantic
,
9439 "ISO C does not support complex integer types");
9440 specs
->type
= build_complex_type (specs
->type
);
9444 gcc_assert (!(specs
->long_p
&& specs
->short_p
));
9445 gcc_assert (!(specs
->signed_p
&& specs
->unsigned_p
));
9446 if (specs
->long_long_p
)
9447 specs
->type
= (specs
->unsigned_p
9448 ? long_long_unsigned_type_node
9449 : long_long_integer_type_node
);
9450 else if (specs
->long_p
)
9451 specs
->type
= (specs
->unsigned_p
9452 ? long_unsigned_type_node
9453 : long_integer_type_node
);
9454 else if (specs
->short_p
)
9455 specs
->type
= (specs
->unsigned_p
9456 ? short_unsigned_type_node
9457 : short_integer_type_node
);
9459 specs
->type
= (specs
->unsigned_p
9460 ? unsigned_type_node
9461 : integer_type_node
);
9462 if (specs
->complex_p
)
9464 pedwarn (input_location
, OPT_pedantic
,
9465 "ISO C does not support complex integer types");
9466 specs
->type
= build_complex_type (specs
->type
);
9470 gcc_assert (!specs
->long_p
&& !specs
->short_p
9471 && !specs
->signed_p
&& !specs
->unsigned_p
);
9472 specs
->type
= (specs
->complex_p
9473 ? complex_float_type_node
9477 gcc_assert (!specs
->long_long_p
&& !specs
->short_p
9478 && !specs
->signed_p
&& !specs
->unsigned_p
);
9481 specs
->type
= (specs
->complex_p
9482 ? complex_long_double_type_node
9483 : long_double_type_node
);
9487 specs
->type
= (specs
->complex_p
9488 ? complex_double_type_node
9489 : double_type_node
);
9495 gcc_assert (!specs
->long_p
&& !specs
->long_long_p
&& !specs
->short_p
9496 && !specs
->signed_p
&& !specs
->unsigned_p
&& !specs
->complex_p
);
9497 if (specs
->typespec_word
== cts_dfloat32
)
9498 specs
->type
= dfloat32_type_node
;
9499 else if (specs
->typespec_word
== cts_dfloat64
)
9500 specs
->type
= dfloat64_type_node
;
9502 specs
->type
= dfloat128_type_node
;
9505 gcc_assert (!specs
->complex_p
);
9506 if (!targetm
.fixed_point_supported_p ())
9507 specs
->type
= integer_type_node
;
9508 else if (specs
->saturating_p
)
9510 if (specs
->long_long_p
)
9511 specs
->type
= specs
->unsigned_p
9512 ? sat_unsigned_long_long_fract_type_node
9513 : sat_long_long_fract_type_node
;
9514 else if (specs
->long_p
)
9515 specs
->type
= specs
->unsigned_p
9516 ? sat_unsigned_long_fract_type_node
9517 : sat_long_fract_type_node
;
9518 else if (specs
->short_p
)
9519 specs
->type
= specs
->unsigned_p
9520 ? sat_unsigned_short_fract_type_node
9521 : sat_short_fract_type_node
;
9523 specs
->type
= specs
->unsigned_p
9524 ? sat_unsigned_fract_type_node
9525 : sat_fract_type_node
;
9529 if (specs
->long_long_p
)
9530 specs
->type
= specs
->unsigned_p
9531 ? unsigned_long_long_fract_type_node
9532 : long_long_fract_type_node
;
9533 else if (specs
->long_p
)
9534 specs
->type
= specs
->unsigned_p
9535 ? unsigned_long_fract_type_node
9536 : long_fract_type_node
;
9537 else if (specs
->short_p
)
9538 specs
->type
= specs
->unsigned_p
9539 ? unsigned_short_fract_type_node
9540 : short_fract_type_node
;
9542 specs
->type
= specs
->unsigned_p
9543 ? unsigned_fract_type_node
9548 gcc_assert (!specs
->complex_p
);
9549 if (!targetm
.fixed_point_supported_p ())
9550 specs
->type
= integer_type_node
;
9551 else if (specs
->saturating_p
)
9553 if (specs
->long_long_p
)
9554 specs
->type
= specs
->unsigned_p
9555 ? sat_unsigned_long_long_accum_type_node
9556 : sat_long_long_accum_type_node
;
9557 else if (specs
->long_p
)
9558 specs
->type
= specs
->unsigned_p
9559 ? sat_unsigned_long_accum_type_node
9560 : sat_long_accum_type_node
;
9561 else if (specs
->short_p
)
9562 specs
->type
= specs
->unsigned_p
9563 ? sat_unsigned_short_accum_type_node
9564 : sat_short_accum_type_node
;
9566 specs
->type
= specs
->unsigned_p
9567 ? sat_unsigned_accum_type_node
9568 : sat_accum_type_node
;
9572 if (specs
->long_long_p
)
9573 specs
->type
= specs
->unsigned_p
9574 ? unsigned_long_long_accum_type_node
9575 : long_long_accum_type_node
;
9576 else if (specs
->long_p
)
9577 specs
->type
= specs
->unsigned_p
9578 ? unsigned_long_accum_type_node
9579 : long_accum_type_node
;
9580 else if (specs
->short_p
)
9581 specs
->type
= specs
->unsigned_p
9582 ? unsigned_short_accum_type_node
9583 : short_accum_type_node
;
9585 specs
->type
= specs
->unsigned_p
9586 ? unsigned_accum_type_node
9597 /* A subroutine of c_write_global_declarations. Perform final processing
9598 on one file scope's declarations (or the external scope's declarations),
9602 c_write_global_declarations_1 (tree globals
)
9607 /* Process the decls in the order they were written. */
9608 for (decl
= globals
; decl
; decl
= DECL_CHAIN (decl
))
9610 /* Check for used but undefined static functions using the C
9611 standard's definition of "used", and set TREE_NO_WARNING so
9612 that check_global_declarations doesn't repeat the check. */
9613 if (TREE_CODE (decl
) == FUNCTION_DECL
9614 && DECL_INITIAL (decl
) == 0
9615 && DECL_EXTERNAL (decl
)
9616 && !TREE_PUBLIC (decl
)
9617 && C_DECL_USED (decl
))
9619 pedwarn (input_location
, 0, "%q+F used but never defined", decl
);
9620 TREE_NO_WARNING (decl
) = 1;
9623 wrapup_global_declaration_1 (decl
);
9629 for (decl
= globals
; decl
; decl
= DECL_CHAIN (decl
))
9630 reconsider
|= wrapup_global_declaration_2 (decl
);
9634 for (decl
= globals
; decl
; decl
= DECL_CHAIN (decl
))
9635 check_global_declaration_1 (decl
);
9638 /* A subroutine of c_write_global_declarations Emit debug information for each
9639 of the declarations in GLOBALS. */
9642 c_write_global_declarations_2 (tree globals
)
9646 for (decl
= globals
; decl
; decl
= DECL_CHAIN (decl
))
9647 debug_hooks
->global_decl (decl
);
9650 /* Callback to collect a source_ref from a DECL. */
9653 collect_source_ref_cb (tree decl
)
9655 if (!DECL_IS_BUILTIN (decl
))
9656 collect_source_ref (LOCATION_FILE (decl_sloc (decl
, false)));
9659 /* Collect all references relevant to SOURCE_FILE. */
9662 collect_all_refs (const char *source_file
)
9666 for (t
= all_translation_units
; t
; t
= TREE_CHAIN (t
))
9667 collect_ada_nodes (BLOCK_VARS (DECL_INITIAL (t
)), source_file
);
9670 /* Iterate over all global declarations and call CALLBACK. */
9673 for_each_global_decl (void (*callback
) (tree decl
))
9679 for (t
= all_translation_units
; t
; t
= TREE_CHAIN (t
))
9681 decls
= DECL_INITIAL (t
);
9682 for (decl
= BLOCK_VARS (decls
); decl
; decl
= TREE_CHAIN (decl
))
9687 /* Preserve the external declarations scope across a garbage collect. */
9688 static GTY(()) tree ext_block
;
9691 c_write_global_declarations (void)
9695 /* We don't want to do this if generating a PCH. */
9699 /* Close the external scope. */
9700 ext_block
= pop_scope ();
9702 gcc_assert (!current_scope
);
9704 /* Handle -fdump-ada-spec[-slim]. */
9705 if (dump_enabled_p (TDI_ada
))
9707 /* Build a table of files to generate specs for */
9708 if (get_dump_file_info (TDI_ada
)->flags
& TDF_SLIM
)
9709 collect_source_ref (main_input_filename
);
9711 for_each_global_decl (collect_source_ref_cb
);
9713 dump_ada_specs (collect_all_refs
, NULL
);
9718 tree tmp
= BLOCK_VARS (ext_block
);
9720 FILE * stream
= dump_begin (TDI_tu
, &flags
);
9723 dump_node (tmp
, flags
& ~TDF_SLIM
, stream
);
9724 dump_end (TDI_tu
, stream
);
9728 /* Process all file scopes in this compilation, and the external_scope,
9729 through wrapup_global_declarations and check_global_declarations. */
9730 for (t
= all_translation_units
; t
; t
= DECL_CHAIN (t
))
9731 c_write_global_declarations_1 (BLOCK_VARS (DECL_INITIAL (t
)));
9732 c_write_global_declarations_1 (BLOCK_VARS (ext_block
));
9734 /* We're done parsing; proceed to optimize and emit assembly.
9735 FIXME: shouldn't be the front end's responsibility to call this. */
9736 cgraph_finalize_compilation_unit ();
9738 /* After cgraph has had a chance to emit everything that's going to
9739 be emitted, output debug information for globals. */
9742 timevar_push (TV_SYMOUT
);
9743 for (t
= all_translation_units
; t
; t
= DECL_CHAIN (t
))
9744 c_write_global_declarations_2 (BLOCK_VARS (DECL_INITIAL (t
)));
9745 c_write_global_declarations_2 (BLOCK_VARS (ext_block
));
9746 timevar_pop (TV_SYMOUT
);
9752 /* Register reserved keyword WORD as qualifier for address space AS. */
9755 c_register_addr_space (const char *word
, addr_space_t as
)
9757 int rid
= RID_FIRST_ADDR_SPACE
+ as
;
9760 /* Address space qualifiers are only supported
9761 in C with GNU extensions enabled. */
9762 if (c_dialect_objc () || flag_no_asm
)
9765 id
= get_identifier (word
);
9766 C_SET_RID_CODE (id
, rid
);
9767 C_IS_RESERVED_WORD (id
) = 1;
9768 ridpointers
[rid
] = id
;
9771 #include "gt-c-decl.h"