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
1003 VEC_iterate (c_goto_bindings_p
, label_vars
->gotos
, ix
, g
);
1005 update_spot_bindings (scope
, &g
->goto_bindings
);
1009 /* Don't search beyond the current function. */
1010 if (s
== current_function_scope
)
1017 /* Set the TYPE_CONTEXT of all of TYPE's variants to CONTEXT. */
1020 set_type_context (tree type
, tree context
)
1022 for (type
= TYPE_MAIN_VARIANT (type
); type
;
1023 type
= TYPE_NEXT_VARIANT (type
))
1024 TYPE_CONTEXT (type
) = context
;
1027 /* Exit a scope. Restore the state of the identifier-decl mappings
1028 that were in effect when this scope was entered. Return a BLOCK
1029 node containing all the DECLs in this scope that are of interest
1030 to debug info generation. */
1035 struct c_scope
*scope
= current_scope
;
1036 tree block
, context
, p
;
1037 struct c_binding
*b
;
1039 bool functionbody
= scope
->function_body
;
1040 bool keep
= functionbody
|| scope
->keep
|| scope
->bindings
;
1042 update_label_decls (scope
);
1044 /* If appropriate, create a BLOCK to record the decls for the life
1045 of this function. */
1049 block
= make_node (BLOCK
);
1050 BLOCK_SUBBLOCKS (block
) = scope
->blocks
;
1051 TREE_USED (block
) = 1;
1053 /* In each subblock, record that this is its superior. */
1054 for (p
= scope
->blocks
; p
; p
= BLOCK_CHAIN (p
))
1055 BLOCK_SUPERCONTEXT (p
) = block
;
1057 BLOCK_VARS (block
) = 0;
1060 /* The TYPE_CONTEXTs for all of the tagged types belonging to this
1061 scope must be set so that they point to the appropriate
1062 construct, i.e. either to the current FUNCTION_DECL node, or
1063 else to the BLOCK node we just constructed.
1065 Note that for tagged types whose scope is just the formal
1066 parameter list for some function type specification, we can't
1067 properly set their TYPE_CONTEXTs here, because we don't have a
1068 pointer to the appropriate FUNCTION_TYPE node readily available
1069 to us. For those cases, the TYPE_CONTEXTs of the relevant tagged
1070 type nodes get set in `grokdeclarator' as soon as we have created
1071 the FUNCTION_TYPE node which will represent the "scope" for these
1072 "parameter list local" tagged types. */
1073 if (scope
->function_body
)
1074 context
= current_function_decl
;
1075 else if (scope
== file_scope
)
1077 tree file_decl
= build_decl (UNKNOWN_LOCATION
,
1078 TRANSLATION_UNIT_DECL
, 0, 0);
1079 DECL_CHAIN (file_decl
) = all_translation_units
;
1080 all_translation_units
= file_decl
;
1081 context
= file_decl
;
1086 /* Clear all bindings in this scope. */
1087 for (b
= scope
->bindings
; b
; b
= free_binding_and_advance (b
))
1090 switch (TREE_CODE (p
))
1093 /* Warnings for unused labels, errors for undefined labels. */
1094 if (TREE_USED (p
) && !DECL_INITIAL (p
))
1096 error ("label %q+D used but not defined", p
);
1097 DECL_INITIAL (p
) = error_mark_node
;
1100 warn_for_unused_label (p
);
1102 /* Labels go in BLOCK_VARS. */
1103 DECL_CHAIN (p
) = BLOCK_VARS (block
);
1104 BLOCK_VARS (block
) = p
;
1105 gcc_assert (I_LABEL_BINDING (b
->id
) == b
);
1106 I_LABEL_BINDING (b
->id
) = b
->shadowed
;
1108 /* Also pop back to the shadowed label_vars. */
1109 release_tree_vector (b
->u
.label
->decls_in_scope
);
1110 b
->u
.label
= b
->u
.label
->shadowed
;
1116 set_type_context (p
, context
);
1118 /* Types may not have tag-names, in which case the type
1119 appears in the bindings list with b->id NULL. */
1122 gcc_assert (I_TAG_BINDING (b
->id
) == b
);
1123 I_TAG_BINDING (b
->id
) = b
->shadowed
;
1128 /* Propagate TREE_ADDRESSABLE from nested functions to their
1129 containing functions. */
1130 if (!TREE_ASM_WRITTEN (p
)
1131 && DECL_INITIAL (p
) != 0
1132 && TREE_ADDRESSABLE (p
)
1133 && DECL_ABSTRACT_ORIGIN (p
) != 0
1134 && DECL_ABSTRACT_ORIGIN (p
) != p
)
1135 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (p
)) = 1;
1136 if (!DECL_EXTERNAL (p
)
1137 && !DECL_INITIAL (p
)
1138 && scope
!= file_scope
1139 && scope
!= external_scope
)
1141 error ("nested function %q+D declared but never defined", p
);
1142 undef_nested_function
= true;
1144 else if (DECL_DECLARED_INLINE_P (p
)
1146 && !DECL_INITIAL (p
))
1148 /* C99 6.7.4p6: "a function with external linkage... declared
1149 with an inline function specifier ... shall also be defined
1150 in the same translation unit." */
1151 if (!flag_gnu89_inline
)
1152 pedwarn (input_location
, 0,
1153 "inline function %q+D declared but never defined", p
);
1154 DECL_EXTERNAL (p
) = 1;
1160 /* Warnings for unused variables. */
1161 if ((!TREE_USED (p
) || !DECL_READ_P (p
))
1162 && !TREE_NO_WARNING (p
)
1163 && !DECL_IN_SYSTEM_HEADER (p
)
1165 && !DECL_ARTIFICIAL (p
)
1166 && scope
!= file_scope
1167 && scope
!= external_scope
)
1170 warning (OPT_Wunused_variable
, "unused variable %q+D", p
);
1171 else if (DECL_CONTEXT (p
) == current_function_decl
)
1172 warning_at (DECL_SOURCE_LOCATION (p
),
1173 OPT_Wunused_but_set_variable
,
1174 "variable %qD set but not used", p
);
1179 error ("type of array %q+D completed incompatibly with"
1180 " implicit initialization", p
);
1187 /* All of these go in BLOCK_VARS, but only if this is the
1188 binding in the home scope. */
1191 DECL_CHAIN (p
) = BLOCK_VARS (block
);
1192 BLOCK_VARS (block
) = p
;
1194 else if (VAR_OR_FUNCTION_DECL_P (p
))
1196 /* For block local externs add a special
1197 DECL_EXTERNAL decl for debug info generation. */
1198 tree extp
= copy_node (p
);
1200 DECL_EXTERNAL (extp
) = 1;
1201 TREE_STATIC (extp
) = 0;
1202 TREE_PUBLIC (extp
) = 1;
1203 DECL_INITIAL (extp
) = NULL_TREE
;
1204 DECL_LANG_SPECIFIC (extp
) = NULL
;
1205 DECL_CONTEXT (extp
) = current_function_decl
;
1206 if (TREE_CODE (p
) == FUNCTION_DECL
)
1208 DECL_RESULT (extp
) = NULL_TREE
;
1209 DECL_SAVED_TREE (extp
) = NULL_TREE
;
1210 DECL_STRUCT_FUNCTION (extp
) = NULL
;
1212 if (b
->locus
!= UNKNOWN_LOCATION
)
1213 DECL_SOURCE_LOCATION (extp
) = b
->locus
;
1214 DECL_CHAIN (extp
) = BLOCK_VARS (block
);
1215 BLOCK_VARS (block
) = extp
;
1217 /* If this is the file scope, and we are processing more
1218 than one translation unit in this compilation, set
1219 DECL_CONTEXT of each decl to the TRANSLATION_UNIT_DECL.
1220 This makes same_translation_unit_p work, and causes
1221 static declarations to be given disambiguating suffixes. */
1222 if (scope
== file_scope
&& num_in_fnames
> 1)
1224 DECL_CONTEXT (p
) = context
;
1225 if (TREE_CODE (p
) == TYPE_DECL
)
1226 set_type_context (TREE_TYPE (p
), context
);
1230 /* Parameters go in DECL_ARGUMENTS, not BLOCK_VARS, and have
1231 already been put there by store_parm_decls. Unused-
1232 parameter warnings are handled by function.c.
1233 error_mark_node obviously does not go in BLOCK_VARS and
1234 does not get unused-variable warnings. */
1237 /* It is possible for a decl not to have a name. We get
1238 here with b->id NULL in this case. */
1241 gcc_assert (I_SYMBOL_BINDING (b
->id
) == b
);
1242 I_SYMBOL_BINDING (b
->id
) = b
->shadowed
;
1243 if (b
->shadowed
&& b
->shadowed
->u
.type
)
1244 TREE_TYPE (b
->shadowed
->decl
) = b
->shadowed
->u
.type
;
1254 /* Dispose of the block that we just made inside some higher level. */
1255 if ((scope
->function_body
|| scope
== file_scope
) && context
)
1257 DECL_INITIAL (context
) = block
;
1258 BLOCK_SUPERCONTEXT (block
) = context
;
1260 else if (scope
->outer
)
1263 SCOPE_LIST_APPEND (scope
->outer
, blocks
, block
);
1264 /* If we did not make a block for the scope just exited, any
1265 blocks made for inner scopes must be carried forward so they
1266 will later become subblocks of something else. */
1267 else if (scope
->blocks
)
1268 SCOPE_LIST_CONCAT (scope
->outer
, blocks
, scope
, blocks
);
1271 /* Pop the current scope, and free the structure for reuse. */
1272 current_scope
= scope
->outer
;
1273 if (scope
->function_body
)
1274 current_function_scope
= scope
->outer_function
;
1276 memset (scope
, 0, sizeof (struct c_scope
));
1277 scope
->outer
= scope_freelist
;
1278 scope_freelist
= scope
;
1284 push_file_scope (void)
1292 file_scope
= current_scope
;
1294 start_fname_decls ();
1296 for (decl
= visible_builtins
; decl
; decl
= DECL_CHAIN (decl
))
1297 bind (DECL_NAME (decl
), decl
, file_scope
,
1298 /*invisible=*/false, /*nested=*/true, DECL_SOURCE_LOCATION (decl
));
1302 pop_file_scope (void)
1304 /* In case there were missing closebraces, get us back to the global
1306 while (current_scope
!= file_scope
)
1309 /* __FUNCTION__ is defined at file scope (""). This
1310 call may not be necessary as my tests indicate it
1311 still works without it. */
1312 finish_fname_decls ();
1314 check_inline_statics ();
1316 /* This is the point to write out a PCH if we're doing that.
1317 In that case we do not want to do anything else. */
1320 c_common_write_pch ();
1324 /* Pop off the file scope and close this translation unit. */
1328 maybe_apply_pending_pragma_weaks ();
1331 /* Adjust the bindings for the start of a statement expression. */
1334 c_bindings_start_stmt_expr (struct c_spot_bindings
* switch_bindings
)
1336 struct c_scope
*scope
;
1338 for (scope
= current_scope
; scope
!= NULL
; scope
= scope
->outer
)
1340 struct c_binding
*b
;
1342 if (!scope
->has_label_bindings
)
1345 for (b
= scope
->bindings
; b
!= NULL
; b
= b
->prev
)
1347 struct c_label_vars
*label_vars
;
1349 struct c_goto_bindings
*g
;
1351 if (TREE_CODE (b
->decl
) != LABEL_DECL
)
1353 label_vars
= b
->u
.label
;
1354 ++label_vars
->label_bindings
.stmt_exprs
;
1356 VEC_iterate (c_goto_bindings_p
, label_vars
->gotos
, ix
, g
);
1358 ++g
->goto_bindings
.stmt_exprs
;
1362 if (switch_bindings
!= NULL
)
1363 ++switch_bindings
->stmt_exprs
;
1366 /* Adjust the bindings for the end of a statement expression. */
1369 c_bindings_end_stmt_expr (struct c_spot_bindings
*switch_bindings
)
1371 struct c_scope
*scope
;
1373 for (scope
= current_scope
; scope
!= NULL
; scope
= scope
->outer
)
1375 struct c_binding
*b
;
1377 if (!scope
->has_label_bindings
)
1380 for (b
= scope
->bindings
; b
!= NULL
; b
= b
->prev
)
1382 struct c_label_vars
*label_vars
;
1384 struct c_goto_bindings
*g
;
1386 if (TREE_CODE (b
->decl
) != LABEL_DECL
)
1388 label_vars
= b
->u
.label
;
1389 --label_vars
->label_bindings
.stmt_exprs
;
1390 if (label_vars
->label_bindings
.stmt_exprs
< 0)
1392 label_vars
->label_bindings
.left_stmt_expr
= true;
1393 label_vars
->label_bindings
.stmt_exprs
= 0;
1396 VEC_iterate (c_goto_bindings_p
, label_vars
->gotos
, ix
, g
);
1399 --g
->goto_bindings
.stmt_exprs
;
1400 if (g
->goto_bindings
.stmt_exprs
< 0)
1402 g
->goto_bindings
.left_stmt_expr
= true;
1403 g
->goto_bindings
.stmt_exprs
= 0;
1409 if (switch_bindings
!= NULL
)
1411 --switch_bindings
->stmt_exprs
;
1412 gcc_assert (switch_bindings
->stmt_exprs
>= 0);
1416 /* Push a definition or a declaration of struct, union or enum tag "name".
1417 "type" should be the type node.
1418 We assume that the tag "name" is not already defined, and has a location
1421 Note that the definition may really be just a forward reference.
1422 In that case, the TYPE_SIZE will be zero. */
1425 pushtag (location_t loc
, tree name
, tree type
)
1427 /* Record the identifier as the type's name if it has none. */
1428 if (name
&& !TYPE_NAME (type
))
1429 TYPE_NAME (type
) = name
;
1430 bind (name
, type
, current_scope
, /*invisible=*/false, /*nested=*/false, loc
);
1432 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1433 tagged type we just added to the current scope. This fake
1434 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1435 to output a representation of a tagged type, and it also gives
1436 us a convenient place to record the "scope start" address for the
1439 TYPE_STUB_DECL (type
) = pushdecl (build_decl (loc
,
1440 TYPE_DECL
, NULL_TREE
, type
));
1442 /* An approximation for now, so we can tell this is a function-scope tag.
1443 This will be updated in pop_scope. */
1444 TYPE_CONTEXT (type
) = DECL_CONTEXT (TYPE_STUB_DECL (type
));
1446 if (warn_cxx_compat
&& name
!= NULL_TREE
)
1448 struct c_binding
*b
= I_SYMBOL_BINDING (name
);
1451 && b
->decl
!= NULL_TREE
1452 && TREE_CODE (b
->decl
) == TYPE_DECL
1453 && (B_IN_CURRENT_SCOPE (b
)
1454 || (current_scope
== file_scope
&& B_IN_EXTERNAL_SCOPE (b
)))
1455 && (TYPE_MAIN_VARIANT (TREE_TYPE (b
->decl
))
1456 != TYPE_MAIN_VARIANT (type
)))
1458 warning_at (loc
, OPT_Wc___compat
,
1459 ("using %qD as both a typedef and a tag is "
1462 if (b
->locus
!= UNKNOWN_LOCATION
)
1463 inform (b
->locus
, "originally defined here");
1468 /* Subroutine of compare_decls. Allow harmless mismatches in return
1469 and argument types provided that the type modes match. This function
1470 return a unified type given a suitable match, and 0 otherwise. */
1473 match_builtin_function_types (tree newtype
, tree oldtype
)
1475 tree newrettype
, oldrettype
;
1476 tree newargs
, oldargs
;
1477 tree trytype
, tryargs
;
1479 /* Accept the return type of the new declaration if same modes. */
1480 oldrettype
= TREE_TYPE (oldtype
);
1481 newrettype
= TREE_TYPE (newtype
);
1483 if (TYPE_MODE (oldrettype
) != TYPE_MODE (newrettype
))
1486 oldargs
= TYPE_ARG_TYPES (oldtype
);
1487 newargs
= TYPE_ARG_TYPES (newtype
);
1490 while (oldargs
|| newargs
)
1494 || !TREE_VALUE (oldargs
)
1495 || !TREE_VALUE (newargs
)
1496 || TYPE_MODE (TREE_VALUE (oldargs
))
1497 != TYPE_MODE (TREE_VALUE (newargs
)))
1500 oldargs
= TREE_CHAIN (oldargs
);
1501 newargs
= TREE_CHAIN (newargs
);
1504 trytype
= build_function_type (newrettype
, tryargs
);
1505 return build_type_attribute_variant (trytype
, TYPE_ATTRIBUTES (oldtype
));
1508 /* Subroutine of diagnose_mismatched_decls. Check for function type
1509 mismatch involving an empty arglist vs a nonempty one and give clearer
1512 diagnose_arglist_conflict (tree newdecl
, tree olddecl
,
1513 tree newtype
, tree oldtype
)
1517 if (TREE_CODE (olddecl
) != FUNCTION_DECL
1518 || !comptypes (TREE_TYPE (oldtype
), TREE_TYPE (newtype
))
1519 || !((TYPE_ARG_TYPES (oldtype
) == 0 && DECL_INITIAL (olddecl
) == 0)
1521 (TYPE_ARG_TYPES (newtype
) == 0 && DECL_INITIAL (newdecl
) == 0)))
1524 t
= TYPE_ARG_TYPES (oldtype
);
1526 t
= TYPE_ARG_TYPES (newtype
);
1527 for (; t
; t
= TREE_CHAIN (t
))
1529 tree type
= TREE_VALUE (t
);
1531 if (TREE_CHAIN (t
) == 0
1532 && TYPE_MAIN_VARIANT (type
) != void_type_node
)
1534 inform (input_location
, "a parameter list with an ellipsis can%'t match "
1535 "an empty parameter name list declaration");
1539 if (c_type_promotes_to (type
) != type
)
1541 inform (input_location
, "an argument type that has a default promotion can%'t match "
1542 "an empty parameter name list declaration");
1548 /* Another subroutine of diagnose_mismatched_decls. OLDDECL is an
1549 old-style function definition, NEWDECL is a prototype declaration.
1550 Diagnose inconsistencies in the argument list. Returns TRUE if
1551 the prototype is compatible, FALSE if not. */
1553 validate_proto_after_old_defn (tree newdecl
, tree newtype
, tree oldtype
)
1555 tree newargs
, oldargs
;
1558 #define END_OF_ARGLIST(t) ((t) == void_type_node)
1560 oldargs
= TYPE_ACTUAL_ARG_TYPES (oldtype
);
1561 newargs
= TYPE_ARG_TYPES (newtype
);
1566 tree oldargtype
= TREE_VALUE (oldargs
);
1567 tree newargtype
= TREE_VALUE (newargs
);
1569 if (oldargtype
== error_mark_node
|| newargtype
== error_mark_node
)
1572 oldargtype
= TYPE_MAIN_VARIANT (oldargtype
);
1573 newargtype
= TYPE_MAIN_VARIANT (newargtype
);
1575 if (END_OF_ARGLIST (oldargtype
) && END_OF_ARGLIST (newargtype
))
1578 /* Reaching the end of just one list means the two decls don't
1579 agree on the number of arguments. */
1580 if (END_OF_ARGLIST (oldargtype
))
1582 error ("prototype for %q+D declares more arguments "
1583 "than previous old-style definition", newdecl
);
1586 else if (END_OF_ARGLIST (newargtype
))
1588 error ("prototype for %q+D declares fewer arguments "
1589 "than previous old-style definition", newdecl
);
1593 /* Type for passing arg must be consistent with that declared
1595 else if (!comptypes (oldargtype
, newargtype
))
1597 error ("prototype for %q+D declares argument %d"
1598 " with incompatible type",
1603 oldargs
= TREE_CHAIN (oldargs
);
1604 newargs
= TREE_CHAIN (newargs
);
1608 /* If we get here, no errors were found, but do issue a warning
1609 for this poor-style construct. */
1610 warning (0, "prototype for %q+D follows non-prototype definition",
1613 #undef END_OF_ARGLIST
1616 /* Subroutine of diagnose_mismatched_decls. Report the location of DECL,
1617 first in a pair of mismatched declarations, using the diagnostic
1620 locate_old_decl (tree decl
)
1622 if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_BUILT_IN (decl
))
1624 else if (DECL_INITIAL (decl
))
1625 inform (input_location
, "previous definition of %q+D was here", decl
);
1626 else if (C_DECL_IMPLICIT (decl
))
1627 inform (input_location
, "previous implicit declaration of %q+D was here", decl
);
1629 inform (input_location
, "previous declaration of %q+D was here", decl
);
1632 /* Subroutine of duplicate_decls. Compare NEWDECL to OLDDECL.
1633 Returns true if the caller should proceed to merge the two, false
1634 if OLDDECL should simply be discarded. As a side effect, issues
1635 all necessary diagnostics for invalid or poor-style combinations.
1636 If it returns true, writes the types of NEWDECL and OLDDECL to
1637 *NEWTYPEP and *OLDTYPEP - these may have been adjusted from
1638 TREE_TYPE (NEWDECL, OLDDECL) respectively. */
1641 diagnose_mismatched_decls (tree newdecl
, tree olddecl
,
1642 tree
*newtypep
, tree
*oldtypep
)
1644 tree newtype
, oldtype
;
1645 bool pedwarned
= false;
1646 bool warned
= false;
1649 #define DECL_EXTERN_INLINE(DECL) (DECL_DECLARED_INLINE_P (DECL) \
1650 && DECL_EXTERNAL (DECL))
1652 /* If we have error_mark_node for either decl or type, just discard
1653 the previous decl - we're in an error cascade already. */
1654 if (olddecl
== error_mark_node
|| newdecl
== error_mark_node
)
1656 *oldtypep
= oldtype
= TREE_TYPE (olddecl
);
1657 *newtypep
= newtype
= TREE_TYPE (newdecl
);
1658 if (oldtype
== error_mark_node
|| newtype
== error_mark_node
)
1661 /* Two different categories of symbol altogether. This is an error
1662 unless OLDDECL is a builtin. OLDDECL will be discarded in any case. */
1663 if (TREE_CODE (olddecl
) != TREE_CODE (newdecl
))
1665 if (!(TREE_CODE (olddecl
) == FUNCTION_DECL
1666 && DECL_BUILT_IN (olddecl
)
1667 && !C_DECL_DECLARED_BUILTIN (olddecl
)))
1669 error ("%q+D redeclared as different kind of symbol", newdecl
);
1670 locate_old_decl (olddecl
);
1672 else if (TREE_PUBLIC (newdecl
))
1673 warning (0, "built-in function %q+D declared as non-function",
1676 warning (OPT_Wshadow
, "declaration of %q+D shadows "
1677 "a built-in function", newdecl
);
1681 /* Enumerators have no linkage, so may only be declared once in a
1683 if (TREE_CODE (olddecl
) == CONST_DECL
)
1685 error ("redeclaration of enumerator %q+D", newdecl
);
1686 locate_old_decl (olddecl
);
1690 if (!comptypes (oldtype
, newtype
))
1692 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1693 && DECL_BUILT_IN (olddecl
) && !C_DECL_DECLARED_BUILTIN (olddecl
))
1695 /* Accept harmless mismatch in function types.
1696 This is for the ffs and fprintf builtins. */
1697 tree trytype
= match_builtin_function_types (newtype
, oldtype
);
1699 if (trytype
&& comptypes (newtype
, trytype
))
1700 *oldtypep
= oldtype
= trytype
;
1703 /* If types don't match for a built-in, throw away the
1704 built-in. No point in calling locate_old_decl here, it
1705 won't print anything. */
1706 warning (0, "conflicting types for built-in function %q+D",
1711 else if (TREE_CODE (olddecl
) == FUNCTION_DECL
1712 && DECL_IS_BUILTIN (olddecl
))
1714 /* A conflicting function declaration for a predeclared
1715 function that isn't actually built in. Objective C uses
1716 these. The new declaration silently overrides everything
1717 but the volatility (i.e. noreturn) indication. See also
1718 below. FIXME: Make Objective C use normal builtins. */
1719 TREE_THIS_VOLATILE (newdecl
) |= TREE_THIS_VOLATILE (olddecl
);
1722 /* Permit void foo (...) to match int foo (...) if the latter is
1723 the definition and implicit int was used. See
1724 c-torture/compile/920625-2.c. */
1725 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
&& DECL_INITIAL (newdecl
)
1726 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype
)) == void_type_node
1727 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype
)) == integer_type_node
1728 && C_FUNCTION_IMPLICIT_INT (newdecl
) && !DECL_INITIAL (olddecl
))
1730 pedwarned
= pedwarn (input_location
, 0,
1731 "conflicting types for %q+D", newdecl
);
1732 /* Make sure we keep void as the return type. */
1733 TREE_TYPE (newdecl
) = *newtypep
= newtype
= oldtype
;
1734 C_FUNCTION_IMPLICIT_INT (newdecl
) = 0;
1736 /* Permit void foo (...) to match an earlier call to foo (...) with
1737 no declared type (thus, implicitly int). */
1738 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
1739 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype
)) == void_type_node
1740 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype
)) == integer_type_node
1741 && C_DECL_IMPLICIT (olddecl
) && !DECL_INITIAL (olddecl
))
1743 pedwarned
= pedwarn (input_location
, 0,
1744 "conflicting types for %q+D", newdecl
);
1745 /* Make sure we keep void as the return type. */
1746 TREE_TYPE (olddecl
) = *oldtypep
= oldtype
= newtype
;
1750 int new_quals
= TYPE_QUALS (newtype
);
1751 int old_quals
= TYPE_QUALS (oldtype
);
1753 if (new_quals
!= old_quals
)
1755 addr_space_t new_addr
= DECODE_QUAL_ADDR_SPACE (new_quals
);
1756 addr_space_t old_addr
= DECODE_QUAL_ADDR_SPACE (old_quals
);
1757 if (new_addr
!= old_addr
)
1759 if (ADDR_SPACE_GENERIC_P (new_addr
))
1760 error ("conflicting named address spaces (generic vs %s) "
1762 c_addr_space_name (old_addr
), newdecl
);
1763 else if (ADDR_SPACE_GENERIC_P (old_addr
))
1764 error ("conflicting named address spaces (%s vs generic) "
1766 c_addr_space_name (new_addr
), newdecl
);
1768 error ("conflicting named address spaces (%s vs %s) "
1770 c_addr_space_name (new_addr
),
1771 c_addr_space_name (old_addr
),
1775 if (CLEAR_QUAL_ADDR_SPACE (new_quals
)
1776 != CLEAR_QUAL_ADDR_SPACE (old_quals
))
1777 error ("conflicting type qualifiers for %q+D", newdecl
);
1780 error ("conflicting types for %q+D", newdecl
);
1781 diagnose_arglist_conflict (newdecl
, olddecl
, newtype
, oldtype
);
1782 locate_old_decl (olddecl
);
1787 /* Redeclaration of a type is a constraint violation (6.7.2.3p1),
1788 but silently ignore the redeclaration if either is in a system
1789 header. (Conflicting redeclarations were handled above.) This
1790 is allowed for C1X if the types are the same, not just
1792 if (TREE_CODE (newdecl
) == TYPE_DECL
)
1794 bool types_different
= false;
1795 int comptypes_result
;
1798 = comptypes_check_different_types (oldtype
, newtype
, &types_different
);
1800 if (comptypes_result
!= 1 || types_different
)
1802 error ("redefinition of typedef %q+D with different type", newdecl
);
1803 locate_old_decl (olddecl
);
1807 if (DECL_IN_SYSTEM_HEADER (newdecl
)
1808 || DECL_IN_SYSTEM_HEADER (olddecl
)
1809 || TREE_NO_WARNING (newdecl
)
1810 || TREE_NO_WARNING (olddecl
))
1811 return true; /* Allow OLDDECL to continue in use. */
1813 if (pedantic
&& !flag_isoc1x
)
1815 pedwarn (input_location
, OPT_pedantic
,
1816 "redefinition of typedef %q+D", newdecl
);
1817 locate_old_decl (olddecl
);
1819 else if (variably_modified_type_p (newtype
, NULL
))
1821 /* Whether there is a constraint violation for the types not
1822 being the same cannot be determined at compile time; a
1823 warning that there may be one at runtime is considered
1824 appropriate (WG14 reflector message 11743, 8 May 2009). */
1825 warning (0, "redefinition of typedef %q+D may be a constraint "
1826 "violation at runtime", newdecl
);
1827 locate_old_decl (olddecl
);
1833 /* Function declarations can either be 'static' or 'extern' (no
1834 qualifier is equivalent to 'extern' - C99 6.2.2p5) and therefore
1835 can never conflict with each other on account of linkage
1836 (6.2.2p4). Multiple definitions are not allowed (6.9p3,5) but
1837 gnu89 mode permits two definitions if one is 'extern inline' and
1838 one is not. The non- extern-inline definition supersedes the
1839 extern-inline definition. */
1841 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1843 /* If you declare a built-in function name as static, or
1844 define the built-in with an old-style definition (so we
1845 can't validate the argument list) the built-in definition is
1846 overridden, but optionally warn this was a bad choice of name. */
1847 if (DECL_BUILT_IN (olddecl
)
1848 && !C_DECL_DECLARED_BUILTIN (olddecl
)
1849 && (!TREE_PUBLIC (newdecl
)
1850 || (DECL_INITIAL (newdecl
)
1851 && !TYPE_ARG_TYPES (TREE_TYPE (newdecl
)))))
1853 warning (OPT_Wshadow
, "declaration of %q+D shadows "
1854 "a built-in function", newdecl
);
1855 /* Discard the old built-in function. */
1859 if (DECL_INITIAL (newdecl
))
1861 if (DECL_INITIAL (olddecl
))
1863 /* If both decls are in the same TU and the new declaration
1864 isn't overriding an extern inline reject the new decl.
1865 In c99, no overriding is allowed in the same translation
1867 if ((!DECL_EXTERN_INLINE (olddecl
)
1868 || DECL_EXTERN_INLINE (newdecl
)
1869 || (!flag_gnu89_inline
1870 && (!DECL_DECLARED_INLINE_P (olddecl
)
1871 || !lookup_attribute ("gnu_inline",
1872 DECL_ATTRIBUTES (olddecl
)))
1873 && (!DECL_DECLARED_INLINE_P (newdecl
)
1874 || !lookup_attribute ("gnu_inline",
1875 DECL_ATTRIBUTES (newdecl
))))
1877 && same_translation_unit_p (newdecl
, olddecl
))
1879 error ("redefinition of %q+D", newdecl
);
1880 locate_old_decl (olddecl
);
1885 /* If we have a prototype after an old-style function definition,
1886 the argument types must be checked specially. */
1887 else if (DECL_INITIAL (olddecl
)
1888 && !TYPE_ARG_TYPES (oldtype
) && TYPE_ARG_TYPES (newtype
)
1889 && TYPE_ACTUAL_ARG_TYPES (oldtype
)
1890 && !validate_proto_after_old_defn (newdecl
, newtype
, oldtype
))
1892 locate_old_decl (olddecl
);
1895 /* A non-static declaration (even an "extern") followed by a
1896 static declaration is undefined behavior per C99 6.2.2p3-5,7.
1897 The same is true for a static forward declaration at block
1898 scope followed by a non-static declaration/definition at file
1899 scope. Static followed by non-static at the same scope is
1900 not undefined behavior, and is the most convenient way to get
1901 some effects (see e.g. what unwind-dw2-fde-glibc.c does to
1902 the definition of _Unwind_Find_FDE in unwind-dw2-fde.c), but
1903 we do diagnose it if -Wtraditional. */
1904 if (TREE_PUBLIC (olddecl
) && !TREE_PUBLIC (newdecl
))
1906 /* Two exceptions to the rule. If olddecl is an extern
1907 inline, or a predeclared function that isn't actually
1908 built in, newdecl silently overrides olddecl. The latter
1909 occur only in Objective C; see also above. (FIXME: Make
1910 Objective C use normal builtins.) */
1911 if (!DECL_IS_BUILTIN (olddecl
)
1912 && !DECL_EXTERN_INLINE (olddecl
))
1914 error ("static declaration of %q+D follows "
1915 "non-static declaration", newdecl
);
1916 locate_old_decl (olddecl
);
1920 else if (TREE_PUBLIC (newdecl
) && !TREE_PUBLIC (olddecl
))
1922 if (DECL_CONTEXT (olddecl
))
1924 error ("non-static declaration of %q+D follows "
1925 "static declaration", newdecl
);
1926 locate_old_decl (olddecl
);
1929 else if (warn_traditional
)
1931 warned
|= warning (OPT_Wtraditional
,
1932 "non-static declaration of %q+D "
1933 "follows static declaration", newdecl
);
1937 /* Make sure gnu_inline attribute is either not present, or
1938 present on all inline decls. */
1939 if (DECL_DECLARED_INLINE_P (olddecl
)
1940 && DECL_DECLARED_INLINE_P (newdecl
))
1942 bool newa
= lookup_attribute ("gnu_inline",
1943 DECL_ATTRIBUTES (newdecl
)) != NULL
;
1944 bool olda
= lookup_attribute ("gnu_inline",
1945 DECL_ATTRIBUTES (olddecl
)) != NULL
;
1948 error_at (input_location
, "%<gnu_inline%> attribute present on %q+D",
1949 newa
? newdecl
: olddecl
);
1950 error_at (DECL_SOURCE_LOCATION (newa
? olddecl
: newdecl
),
1955 else if (TREE_CODE (newdecl
) == VAR_DECL
)
1957 /* Only variables can be thread-local, and all declarations must
1958 agree on this property. */
1959 if (C_DECL_THREADPRIVATE_P (olddecl
) && !DECL_THREAD_LOCAL_P (newdecl
))
1961 /* Nothing to check. Since OLDDECL is marked threadprivate
1962 and NEWDECL does not have a thread-local attribute, we
1963 will merge the threadprivate attribute into NEWDECL. */
1966 else if (DECL_THREAD_LOCAL_P (newdecl
) != DECL_THREAD_LOCAL_P (olddecl
))
1968 if (DECL_THREAD_LOCAL_P (newdecl
))
1969 error ("thread-local declaration of %q+D follows "
1970 "non-thread-local declaration", newdecl
);
1972 error ("non-thread-local declaration of %q+D follows "
1973 "thread-local declaration", newdecl
);
1975 locate_old_decl (olddecl
);
1979 /* Multiple initialized definitions are not allowed (6.9p3,5). */
1980 if (DECL_INITIAL (newdecl
) && DECL_INITIAL (olddecl
))
1982 error ("redefinition of %q+D", newdecl
);
1983 locate_old_decl (olddecl
);
1987 /* Objects declared at file scope: if the first declaration had
1988 external linkage (even if it was an external reference) the
1989 second must have external linkage as well, or the behavior is
1990 undefined. If the first declaration had internal linkage, then
1991 the second must too, or else be an external reference (in which
1992 case the composite declaration still has internal linkage).
1993 As for function declarations, we warn about the static-then-
1994 extern case only for -Wtraditional. See generally 6.2.2p3-5,7. */
1995 if (DECL_FILE_SCOPE_P (newdecl
)
1996 && TREE_PUBLIC (newdecl
) != TREE_PUBLIC (olddecl
))
1998 if (DECL_EXTERNAL (newdecl
))
2000 if (!DECL_FILE_SCOPE_P (olddecl
))
2002 error ("extern declaration of %q+D follows "
2003 "declaration with no linkage", newdecl
);
2004 locate_old_decl (olddecl
);
2007 else if (warn_traditional
)
2009 warned
|= warning (OPT_Wtraditional
,
2010 "non-static declaration of %q+D "
2011 "follows static declaration", newdecl
);
2016 if (TREE_PUBLIC (newdecl
))
2017 error ("non-static declaration of %q+D follows "
2018 "static declaration", newdecl
);
2020 error ("static declaration of %q+D follows "
2021 "non-static declaration", newdecl
);
2023 locate_old_decl (olddecl
);
2027 /* Two objects with the same name declared at the same block
2028 scope must both be external references (6.7p3). */
2029 else if (!DECL_FILE_SCOPE_P (newdecl
))
2031 if (DECL_EXTERNAL (newdecl
))
2033 /* Extern with initializer at block scope, which will
2034 already have received an error. */
2036 else if (DECL_EXTERNAL (olddecl
))
2038 error ("declaration of %q+D with no linkage follows "
2039 "extern declaration", newdecl
);
2040 locate_old_decl (olddecl
);
2044 error ("redeclaration of %q+D with no linkage", newdecl
);
2045 locate_old_decl (olddecl
);
2051 /* C++ does not permit a decl to appear multiple times at file
2054 && DECL_FILE_SCOPE_P (newdecl
)
2055 && !DECL_EXTERNAL (newdecl
)
2056 && !DECL_EXTERNAL (olddecl
))
2057 warned
|= warning_at (DECL_SOURCE_LOCATION (newdecl
),
2059 ("duplicate declaration of %qD is "
2065 /* All decls must agree on a visibility. */
2066 if (CODE_CONTAINS_STRUCT (TREE_CODE (newdecl
), TS_DECL_WITH_VIS
)
2067 && DECL_VISIBILITY_SPECIFIED (newdecl
) && DECL_VISIBILITY_SPECIFIED (olddecl
)
2068 && DECL_VISIBILITY (newdecl
) != DECL_VISIBILITY (olddecl
))
2070 warned
|= warning (0, "redeclaration of %q+D with different visibility "
2071 "(old visibility preserved)", newdecl
);
2074 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2076 /* Diagnose inline __attribute__ ((noinline)) which is silly. */
2077 if (DECL_DECLARED_INLINE_P (newdecl
)
2078 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl
)))
2080 warned
|= warning (OPT_Wattributes
,
2081 "inline declaration of %qD follows "
2082 "declaration with attribute noinline", newdecl
);
2084 else if (DECL_DECLARED_INLINE_P (olddecl
)
2085 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl
)))
2087 warned
|= warning (OPT_Wattributes
,
2088 "declaration of %q+D with attribute "
2089 "noinline follows inline declaration ", newdecl
);
2092 else /* PARM_DECL, VAR_DECL */
2094 /* Redeclaration of a parameter is a constraint violation (this is
2095 not explicitly stated, but follows from C99 6.7p3 [no more than
2096 one declaration of the same identifier with no linkage in the
2097 same scope, except type tags] and 6.2.2p6 [parameters have no
2098 linkage]). We must check for a forward parameter declaration,
2099 indicated by TREE_ASM_WRITTEN on the old declaration - this is
2100 an extension, the mandatory diagnostic for which is handled by
2101 mark_forward_parm_decls. */
2103 if (TREE_CODE (newdecl
) == PARM_DECL
2104 && (!TREE_ASM_WRITTEN (olddecl
) || TREE_ASM_WRITTEN (newdecl
)))
2106 error ("redefinition of parameter %q+D", newdecl
);
2107 locate_old_decl (olddecl
);
2112 /* Optional warning for completely redundant decls. */
2113 if (!warned
&& !pedwarned
2114 && warn_redundant_decls
2115 /* Don't warn about a function declaration followed by a
2117 && !(TREE_CODE (newdecl
) == FUNCTION_DECL
2118 && DECL_INITIAL (newdecl
) && !DECL_INITIAL (olddecl
))
2119 /* Don't warn about redundant redeclarations of builtins. */
2120 && !(TREE_CODE (newdecl
) == FUNCTION_DECL
2121 && !DECL_BUILT_IN (newdecl
)
2122 && DECL_BUILT_IN (olddecl
)
2123 && !C_DECL_DECLARED_BUILTIN (olddecl
))
2124 /* Don't warn about an extern followed by a definition. */
2125 && !(DECL_EXTERNAL (olddecl
) && !DECL_EXTERNAL (newdecl
))
2126 /* Don't warn about forward parameter decls. */
2127 && !(TREE_CODE (newdecl
) == PARM_DECL
2128 && TREE_ASM_WRITTEN (olddecl
) && !TREE_ASM_WRITTEN (newdecl
))
2129 /* Don't warn about a variable definition following a declaration. */
2130 && !(TREE_CODE (newdecl
) == VAR_DECL
2131 && DECL_INITIAL (newdecl
) && !DECL_INITIAL (olddecl
)))
2133 warned
= warning (OPT_Wredundant_decls
, "redundant redeclaration of %q+D",
2137 /* Report location of previous decl/defn. */
2138 if (warned
|| pedwarned
)
2139 locate_old_decl (olddecl
);
2141 #undef DECL_EXTERN_INLINE
2146 /* Subroutine of duplicate_decls. NEWDECL has been found to be
2147 consistent with OLDDECL, but carries new information. Merge the
2148 new information into OLDDECL. This function issues no
2152 merge_decls (tree newdecl
, tree olddecl
, tree newtype
, tree oldtype
)
2154 bool new_is_definition
= (TREE_CODE (newdecl
) == FUNCTION_DECL
2155 && DECL_INITIAL (newdecl
) != 0);
2156 bool new_is_prototype
= (TREE_CODE (newdecl
) == FUNCTION_DECL
2157 && TYPE_ARG_TYPES (TREE_TYPE (newdecl
)) != 0);
2158 bool old_is_prototype
= (TREE_CODE (olddecl
) == FUNCTION_DECL
2159 && TYPE_ARG_TYPES (TREE_TYPE (olddecl
)) != 0);
2160 bool extern_changed
= false;
2162 /* For real parm decl following a forward decl, rechain the old decl
2163 in its new location and clear TREE_ASM_WRITTEN (it's not a
2164 forward decl anymore). */
2165 if (TREE_CODE (newdecl
) == PARM_DECL
2166 && TREE_ASM_WRITTEN (olddecl
) && !TREE_ASM_WRITTEN (newdecl
))
2168 struct c_binding
*b
, **here
;
2170 for (here
= ¤t_scope
->bindings
; *here
; here
= &(*here
)->prev
)
2171 if ((*here
)->decl
== olddecl
)
2178 b
->prev
= current_scope
->bindings
;
2179 current_scope
->bindings
= b
;
2181 TREE_ASM_WRITTEN (olddecl
) = 0;
2184 DECL_ATTRIBUTES (newdecl
)
2185 = targetm
.merge_decl_attributes (olddecl
, newdecl
);
2187 /* Merge the data types specified in the two decls. */
2189 = TREE_TYPE (olddecl
)
2190 = composite_type (newtype
, oldtype
);
2192 /* Lay the type out, unless already done. */
2193 if (!comptypes (oldtype
, TREE_TYPE (newdecl
)))
2195 if (TREE_TYPE (newdecl
) != error_mark_node
)
2196 layout_type (TREE_TYPE (newdecl
));
2197 if (TREE_CODE (newdecl
) != FUNCTION_DECL
2198 && TREE_CODE (newdecl
) != TYPE_DECL
2199 && TREE_CODE (newdecl
) != CONST_DECL
)
2200 layout_decl (newdecl
, 0);
2204 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
2205 DECL_SIZE (newdecl
) = DECL_SIZE (olddecl
);
2206 DECL_SIZE_UNIT (newdecl
) = DECL_SIZE_UNIT (olddecl
);
2207 DECL_MODE (newdecl
) = DECL_MODE (olddecl
);
2208 if (DECL_ALIGN (olddecl
) > DECL_ALIGN (newdecl
))
2210 DECL_ALIGN (newdecl
) = DECL_ALIGN (olddecl
);
2211 DECL_USER_ALIGN (newdecl
) |= DECL_USER_ALIGN (olddecl
);
2215 /* Keep the old rtl since we can safely use it. */
2216 if (HAS_RTL_P (olddecl
))
2217 COPY_DECL_RTL (olddecl
, newdecl
);
2219 /* Merge the type qualifiers. */
2220 if (TREE_READONLY (newdecl
))
2221 TREE_READONLY (olddecl
) = 1;
2223 if (TREE_THIS_VOLATILE (newdecl
))
2224 TREE_THIS_VOLATILE (olddecl
) = 1;
2226 /* Merge deprecatedness. */
2227 if (TREE_DEPRECATED (newdecl
))
2228 TREE_DEPRECATED (olddecl
) = 1;
2230 /* If a decl is in a system header and the other isn't, keep the one on the
2231 system header. Otherwise, keep source location of definition rather than
2232 declaration and of prototype rather than non-prototype unless that
2233 prototype is built-in. */
2234 if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl
), TS_DECL_WITH_VIS
)
2235 && DECL_IN_SYSTEM_HEADER (olddecl
)
2236 && !DECL_IN_SYSTEM_HEADER (newdecl
) )
2237 DECL_SOURCE_LOCATION (newdecl
) = DECL_SOURCE_LOCATION (olddecl
);
2238 else if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl
), TS_DECL_WITH_VIS
)
2239 && DECL_IN_SYSTEM_HEADER (newdecl
)
2240 && !DECL_IN_SYSTEM_HEADER (olddecl
))
2241 DECL_SOURCE_LOCATION (olddecl
) = DECL_SOURCE_LOCATION (newdecl
);
2242 else if ((DECL_INITIAL (newdecl
) == 0 && DECL_INITIAL (olddecl
) != 0)
2243 || (old_is_prototype
&& !new_is_prototype
2244 && !C_DECL_BUILTIN_PROTOTYPE (olddecl
)))
2245 DECL_SOURCE_LOCATION (newdecl
) = DECL_SOURCE_LOCATION (olddecl
);
2247 /* Merge the initialization information. */
2248 if (DECL_INITIAL (newdecl
) == 0)
2249 DECL_INITIAL (newdecl
) = DECL_INITIAL (olddecl
);
2251 /* Merge the threadprivate attribute. */
2252 if (TREE_CODE (olddecl
) == VAR_DECL
&& C_DECL_THREADPRIVATE_P (olddecl
))
2254 DECL_TLS_MODEL (newdecl
) = DECL_TLS_MODEL (olddecl
);
2255 C_DECL_THREADPRIVATE_P (newdecl
) = 1;
2258 if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl
), TS_DECL_WITH_VIS
))
2260 /* Merge the section attribute.
2261 We want to issue an error if the sections conflict but that
2262 must be done later in decl_attributes since we are called
2263 before attributes are assigned. */
2264 if (DECL_SECTION_NAME (newdecl
) == NULL_TREE
)
2265 DECL_SECTION_NAME (newdecl
) = DECL_SECTION_NAME (olddecl
);
2267 /* Copy the assembler name.
2268 Currently, it can only be defined in the prototype. */
2269 COPY_DECL_ASSEMBLER_NAME (olddecl
, newdecl
);
2271 /* Use visibility of whichever declaration had it specified */
2272 if (DECL_VISIBILITY_SPECIFIED (olddecl
))
2274 DECL_VISIBILITY (newdecl
) = DECL_VISIBILITY (olddecl
);
2275 DECL_VISIBILITY_SPECIFIED (newdecl
) = 1;
2278 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2280 DECL_STATIC_CONSTRUCTOR(newdecl
) |= DECL_STATIC_CONSTRUCTOR(olddecl
);
2281 DECL_STATIC_DESTRUCTOR (newdecl
) |= DECL_STATIC_DESTRUCTOR (olddecl
);
2282 DECL_NO_LIMIT_STACK (newdecl
) |= DECL_NO_LIMIT_STACK (olddecl
);
2283 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl
)
2284 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl
);
2285 TREE_THIS_VOLATILE (newdecl
) |= TREE_THIS_VOLATILE (olddecl
);
2286 DECL_IS_MALLOC (newdecl
) |= DECL_IS_MALLOC (olddecl
);
2287 DECL_IS_OPERATOR_NEW (newdecl
) |= DECL_IS_OPERATOR_NEW (olddecl
);
2288 TREE_READONLY (newdecl
) |= TREE_READONLY (olddecl
);
2289 DECL_PURE_P (newdecl
) |= DECL_PURE_P (olddecl
);
2290 DECL_IS_NOVOPS (newdecl
) |= DECL_IS_NOVOPS (olddecl
);
2293 /* Merge the storage class information. */
2294 merge_weak (newdecl
, olddecl
);
2296 /* For functions, static overrides non-static. */
2297 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2299 TREE_PUBLIC (newdecl
) &= TREE_PUBLIC (olddecl
);
2300 /* This is since we don't automatically
2301 copy the attributes of NEWDECL into OLDDECL. */
2302 TREE_PUBLIC (olddecl
) = TREE_PUBLIC (newdecl
);
2303 /* If this clears `static', clear it in the identifier too. */
2304 if (!TREE_PUBLIC (olddecl
))
2305 TREE_PUBLIC (DECL_NAME (olddecl
)) = 0;
2309 /* In c99, 'extern' declaration before (or after) 'inline' means this
2310 function is not DECL_EXTERNAL, unless 'gnu_inline' attribute
2312 if (TREE_CODE (newdecl
) == FUNCTION_DECL
2313 && !flag_gnu89_inline
2314 && (DECL_DECLARED_INLINE_P (newdecl
)
2315 || DECL_DECLARED_INLINE_P (olddecl
))
2316 && (!DECL_DECLARED_INLINE_P (newdecl
)
2317 || !DECL_DECLARED_INLINE_P (olddecl
)
2318 || !DECL_EXTERNAL (olddecl
))
2319 && DECL_EXTERNAL (newdecl
)
2320 && !lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (newdecl
))
2321 && !current_function_decl
)
2322 DECL_EXTERNAL (newdecl
) = 0;
2324 if (DECL_EXTERNAL (newdecl
))
2326 TREE_STATIC (newdecl
) = TREE_STATIC (olddecl
);
2327 DECL_EXTERNAL (newdecl
) = DECL_EXTERNAL (olddecl
);
2329 /* An extern decl does not override previous storage class. */
2330 TREE_PUBLIC (newdecl
) = TREE_PUBLIC (olddecl
);
2331 if (!DECL_EXTERNAL (newdecl
))
2333 DECL_CONTEXT (newdecl
) = DECL_CONTEXT (olddecl
);
2334 DECL_COMMON (newdecl
) = DECL_COMMON (olddecl
);
2339 TREE_STATIC (olddecl
) = TREE_STATIC (newdecl
);
2340 TREE_PUBLIC (olddecl
) = TREE_PUBLIC (newdecl
);
2343 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2345 /* If we're redefining a function previously defined as extern
2346 inline, make sure we emit debug info for the inline before we
2347 throw it away, in case it was inlined into a function that
2348 hasn't been written out yet. */
2349 if (new_is_definition
&& DECL_INITIAL (olddecl
))
2350 /* The new defn must not be inline. */
2351 DECL_UNINLINABLE (newdecl
) = 1;
2354 /* If either decl says `inline', this fn is inline, unless
2355 its definition was passed already. */
2356 if (DECL_DECLARED_INLINE_P (newdecl
)
2357 || DECL_DECLARED_INLINE_P (olddecl
))
2358 DECL_DECLARED_INLINE_P (newdecl
) = 1;
2360 DECL_UNINLINABLE (newdecl
) = DECL_UNINLINABLE (olddecl
)
2361 = (DECL_UNINLINABLE (newdecl
) || DECL_UNINLINABLE (olddecl
));
2363 DECL_DISREGARD_INLINE_LIMITS (newdecl
)
2364 = DECL_DISREGARD_INLINE_LIMITS (olddecl
)
2365 = (DECL_DISREGARD_INLINE_LIMITS (newdecl
)
2366 || DECL_DISREGARD_INLINE_LIMITS (olddecl
));
2369 if (DECL_BUILT_IN (olddecl
))
2371 /* If redeclaring a builtin function, it stays built in.
2372 But it gets tagged as having been declared. */
2373 DECL_BUILT_IN_CLASS (newdecl
) = DECL_BUILT_IN_CLASS (olddecl
);
2374 DECL_FUNCTION_CODE (newdecl
) = DECL_FUNCTION_CODE (olddecl
);
2375 C_DECL_DECLARED_BUILTIN (newdecl
) = 1;
2376 if (new_is_prototype
)
2377 C_DECL_BUILTIN_PROTOTYPE (newdecl
) = 0;
2379 C_DECL_BUILTIN_PROTOTYPE (newdecl
)
2380 = C_DECL_BUILTIN_PROTOTYPE (olddecl
);
2383 /* Preserve function specific target and optimization options */
2384 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl
)
2385 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl
))
2386 DECL_FUNCTION_SPECIFIC_TARGET (newdecl
)
2387 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl
);
2389 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl
)
2390 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl
))
2391 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl
)
2392 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl
);
2394 /* Also preserve various other info from the definition. */
2395 if (!new_is_definition
)
2398 DECL_RESULT (newdecl
) = DECL_RESULT (olddecl
);
2399 DECL_INITIAL (newdecl
) = DECL_INITIAL (olddecl
);
2400 DECL_STRUCT_FUNCTION (newdecl
) = DECL_STRUCT_FUNCTION (olddecl
);
2401 DECL_SAVED_TREE (newdecl
) = DECL_SAVED_TREE (olddecl
);
2402 DECL_ARGUMENTS (newdecl
) = copy_list (DECL_ARGUMENTS (olddecl
));
2403 for (t
= DECL_ARGUMENTS (newdecl
); t
; t
= DECL_CHAIN (t
))
2404 DECL_CONTEXT (t
) = newdecl
;
2406 /* See if we've got a function to instantiate from. */
2407 if (DECL_SAVED_TREE (olddecl
))
2408 DECL_ABSTRACT_ORIGIN (newdecl
)
2409 = DECL_ABSTRACT_ORIGIN (olddecl
);
2413 extern_changed
= DECL_EXTERNAL (olddecl
) && !DECL_EXTERNAL (newdecl
);
2415 /* Merge the USED information. */
2416 if (TREE_USED (olddecl
))
2417 TREE_USED (newdecl
) = 1;
2418 else if (TREE_USED (newdecl
))
2419 TREE_USED (olddecl
) = 1;
2420 if (TREE_CODE (olddecl
) == VAR_DECL
|| TREE_CODE (olddecl
) == PARM_DECL
)
2421 DECL_READ_P (newdecl
) |= DECL_READ_P (olddecl
);
2422 if (DECL_PRESERVE_P (olddecl
))
2423 DECL_PRESERVE_P (newdecl
) = 1;
2424 else if (DECL_PRESERVE_P (newdecl
))
2425 DECL_PRESERVE_P (olddecl
) = 1;
2427 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
2428 But preserve OLDDECL's DECL_UID, DECL_CONTEXT and
2429 DECL_ARGUMENTS (if appropriate). */
2431 unsigned olddecl_uid
= DECL_UID (olddecl
);
2432 tree olddecl_context
= DECL_CONTEXT (olddecl
);
2433 tree olddecl_arguments
= NULL
;
2434 if (TREE_CODE (olddecl
) == FUNCTION_DECL
)
2435 olddecl_arguments
= DECL_ARGUMENTS (olddecl
);
2437 memcpy ((char *) olddecl
+ sizeof (struct tree_common
),
2438 (char *) newdecl
+ sizeof (struct tree_common
),
2439 sizeof (struct tree_decl_common
) - sizeof (struct tree_common
));
2440 switch (TREE_CODE (olddecl
))
2450 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
2451 (char *) newdecl
+ sizeof (struct tree_decl_common
),
2452 tree_code_size (TREE_CODE (olddecl
)) - sizeof (struct tree_decl_common
));
2457 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
2458 (char *) newdecl
+ sizeof (struct tree_decl_common
),
2459 sizeof (struct tree_decl_non_common
) - sizeof (struct tree_decl_common
));
2461 DECL_UID (olddecl
) = olddecl_uid
;
2462 DECL_CONTEXT (olddecl
) = olddecl_context
;
2463 if (TREE_CODE (olddecl
) == FUNCTION_DECL
)
2464 DECL_ARGUMENTS (olddecl
) = olddecl_arguments
;
2467 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2468 so that encode_section_info has a chance to look at the new decl
2469 flags and attributes. */
2470 if (DECL_RTL_SET_P (olddecl
)
2471 && (TREE_CODE (olddecl
) == FUNCTION_DECL
2472 || (TREE_CODE (olddecl
) == VAR_DECL
2473 && TREE_STATIC (olddecl
))))
2474 make_decl_rtl (olddecl
);
2476 /* If we changed a function from DECL_EXTERNAL to !DECL_EXTERNAL,
2477 and the definition is coming from the old version, cgraph needs
2478 to be called again. */
2479 if (extern_changed
&& !new_is_definition
2480 && TREE_CODE (olddecl
) == FUNCTION_DECL
&& DECL_INITIAL (olddecl
))
2481 cgraph_mark_if_needed (olddecl
);
2484 /* Handle when a new declaration NEWDECL has the same name as an old
2485 one OLDDECL in the same binding contour. Prints an error message
2488 If safely possible, alter OLDDECL to look like NEWDECL, and return
2489 true. Otherwise, return false. */
2492 duplicate_decls (tree newdecl
, tree olddecl
)
2494 tree newtype
= NULL
, oldtype
= NULL
;
2496 if (!diagnose_mismatched_decls (newdecl
, olddecl
, &newtype
, &oldtype
))
2498 /* Avoid `unused variable' and other warnings for OLDDECL. */
2499 TREE_NO_WARNING (olddecl
) = 1;
2503 merge_decls (newdecl
, olddecl
, newtype
, oldtype
);
2508 /* Check whether decl-node NEW_DECL shadows an existing declaration. */
2510 warn_if_shadowing (tree new_decl
)
2512 struct c_binding
*b
;
2514 /* Shadow warnings wanted? */
2516 /* No shadow warnings for internally generated vars. */
2517 || DECL_IS_BUILTIN (new_decl
)
2518 /* No shadow warnings for vars made for inlining. */
2519 || DECL_FROM_INLINE (new_decl
))
2522 /* Is anything being shadowed? Invisible decls do not count. */
2523 for (b
= I_SYMBOL_BINDING (DECL_NAME (new_decl
)); b
; b
= b
->shadowed
)
2524 if (b
->decl
&& b
->decl
!= new_decl
&& !b
->invisible
)
2526 tree old_decl
= b
->decl
;
2528 if (old_decl
== error_mark_node
)
2530 warning (OPT_Wshadow
, "declaration of %q+D shadows previous "
2531 "non-variable", new_decl
);
2534 else if (TREE_CODE (old_decl
) == PARM_DECL
)
2535 warning (OPT_Wshadow
, "declaration of %q+D shadows a parameter",
2537 else if (DECL_FILE_SCOPE_P (old_decl
))
2538 warning (OPT_Wshadow
, "declaration of %q+D shadows a global "
2539 "declaration", new_decl
);
2540 else if (TREE_CODE (old_decl
) == FUNCTION_DECL
2541 && DECL_BUILT_IN (old_decl
))
2543 warning (OPT_Wshadow
, "declaration of %q+D shadows "
2544 "a built-in function", new_decl
);
2548 warning (OPT_Wshadow
, "declaration of %q+D shadows a previous local",
2551 warning_at (DECL_SOURCE_LOCATION (old_decl
), OPT_Wshadow
,
2552 "shadowed declaration is here");
2558 /* Record a decl-node X as belonging to the current lexical scope.
2559 Check for errors (such as an incompatible declaration for the same
2560 name already seen in the same scope).
2562 Returns either X or an old decl for the same name.
2563 If an old decl is returned, it may have been smashed
2564 to agree with what X says. */
2569 tree name
= DECL_NAME (x
);
2570 struct c_scope
*scope
= current_scope
;
2571 struct c_binding
*b
;
2572 bool nested
= false;
2573 location_t locus
= DECL_SOURCE_LOCATION (x
);
2575 /* Must set DECL_CONTEXT for everything not at file scope or
2576 DECL_FILE_SCOPE_P won't work. Local externs don't count
2577 unless they have initializers (which generate code). */
2578 if (current_function_decl
2579 && ((TREE_CODE (x
) != FUNCTION_DECL
&& TREE_CODE (x
) != VAR_DECL
)
2580 || DECL_INITIAL (x
) || !DECL_EXTERNAL (x
)))
2581 DECL_CONTEXT (x
) = current_function_decl
;
2583 /* Anonymous decls are just inserted in the scope. */
2586 bind (name
, x
, scope
, /*invisible=*/false, /*nested=*/false,
2591 /* First, see if there is another declaration with the same name in
2592 the current scope. If there is, duplicate_decls may do all the
2593 work for us. If duplicate_decls returns false, that indicates
2594 two incompatible decls in the same scope; we are to silently
2595 replace the old one (duplicate_decls has issued all appropriate
2596 diagnostics). In particular, we should not consider possible
2597 duplicates in the external scope, or shadowing. */
2598 b
= I_SYMBOL_BINDING (name
);
2599 if (b
&& B_IN_SCOPE (b
, scope
))
2601 struct c_binding
*b_ext
, *b_use
;
2602 tree type
= TREE_TYPE (x
);
2603 tree visdecl
= b
->decl
;
2604 tree vistype
= TREE_TYPE (visdecl
);
2605 if (TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
2606 && COMPLETE_TYPE_P (TREE_TYPE (x
)))
2607 b
->inner_comp
= false;
2610 /* If this is an external linkage declaration, we should check
2611 for compatibility with the type in the external scope before
2612 setting the type at this scope based on the visible
2613 information only. */
2614 if (TREE_PUBLIC (x
) && TREE_PUBLIC (visdecl
))
2616 while (b_ext
&& !B_IN_EXTERNAL_SCOPE (b_ext
))
2617 b_ext
= b_ext
->shadowed
;
2622 TREE_TYPE (b_use
->decl
) = b_use
->u
.type
;
2625 if (duplicate_decls (x
, b_use
->decl
))
2629 /* Save the updated type in the external scope and
2630 restore the proper type for this scope. */
2632 if (comptypes (vistype
, type
))
2633 thistype
= composite_type (vistype
, type
);
2635 thistype
= TREE_TYPE (b_use
->decl
);
2636 b_use
->u
.type
= TREE_TYPE (b_use
->decl
);
2637 if (TREE_CODE (b_use
->decl
) == FUNCTION_DECL
2638 && DECL_BUILT_IN (b_use
->decl
))
2640 = build_type_attribute_variant (thistype
,
2643 TREE_TYPE (b_use
->decl
) = thistype
;
2648 goto skip_external_and_shadow_checks
;
2651 /* All declarations with external linkage, and all external
2652 references, go in the external scope, no matter what scope is
2653 current. However, the binding in that scope is ignored for
2654 purposes of normal name lookup. A separate binding structure is
2655 created in the requested scope; this governs the normal
2656 visibility of the symbol.
2658 The binding in the externals scope is used exclusively for
2659 detecting duplicate declarations of the same object, no matter
2660 what scope they are in; this is what we do here. (C99 6.2.7p2:
2661 All declarations that refer to the same object or function shall
2662 have compatible type; otherwise, the behavior is undefined.) */
2663 if (DECL_EXTERNAL (x
) || scope
== file_scope
)
2665 tree type
= TREE_TYPE (x
);
2668 bool type_saved
= false;
2669 if (b
&& !B_IN_EXTERNAL_SCOPE (b
)
2670 && (TREE_CODE (b
->decl
) == FUNCTION_DECL
2671 || TREE_CODE (b
->decl
) == VAR_DECL
)
2672 && DECL_FILE_SCOPE_P (b
->decl
))
2675 vistype
= TREE_TYPE (visdecl
);
2677 if (scope
!= file_scope
2678 && !DECL_IN_SYSTEM_HEADER (x
))
2679 warning (OPT_Wnested_externs
, "nested extern declaration of %qD", x
);
2681 while (b
&& !B_IN_EXTERNAL_SCOPE (b
))
2683 /* If this decl might be modified, save its type. This is
2684 done here rather than when the decl is first bound
2685 because the type may change after first binding, through
2686 being completed or through attributes being added. If we
2687 encounter multiple such decls, only the first should have
2688 its type saved; the others will already have had their
2689 proper types saved and the types will not have changed as
2690 their scopes will not have been re-entered. */
2691 if (DECL_P (b
->decl
) && DECL_FILE_SCOPE_P (b
->decl
) && !type_saved
)
2693 b
->u
.type
= TREE_TYPE (b
->decl
);
2696 if (B_IN_FILE_SCOPE (b
)
2697 && TREE_CODE (b
->decl
) == VAR_DECL
2698 && TREE_STATIC (b
->decl
)
2699 && TREE_CODE (TREE_TYPE (b
->decl
)) == ARRAY_TYPE
2700 && !TYPE_DOMAIN (TREE_TYPE (b
->decl
))
2701 && TREE_CODE (type
) == ARRAY_TYPE
2702 && TYPE_DOMAIN (type
)
2703 && TYPE_MAX_VALUE (TYPE_DOMAIN (type
))
2704 && !integer_zerop (TYPE_MAX_VALUE (TYPE_DOMAIN (type
))))
2706 /* Array type completed in inner scope, which should be
2707 diagnosed if the completion does not have size 1 and
2708 it does not get completed in the file scope. */
2709 b
->inner_comp
= true;
2714 /* If a matching external declaration has been found, set its
2715 type to the composite of all the types of that declaration.
2716 After the consistency checks, it will be reset to the
2717 composite of the visible types only. */
2718 if (b
&& (TREE_PUBLIC (x
) || same_translation_unit_p (x
, b
->decl
))
2720 TREE_TYPE (b
->decl
) = b
->u
.type
;
2722 /* The point of the same_translation_unit_p check here is,
2723 we want to detect a duplicate decl for a construct like
2724 foo() { extern bar(); } ... static bar(); but not if
2725 they are in different translation units. In any case,
2726 the static does not go in the externals scope. */
2728 && (TREE_PUBLIC (x
) || same_translation_unit_p (x
, b
->decl
))
2729 && duplicate_decls (x
, b
->decl
))
2734 if (comptypes (vistype
, type
))
2735 thistype
= composite_type (vistype
, type
);
2737 thistype
= TREE_TYPE (b
->decl
);
2741 b
->u
.type
= TREE_TYPE (b
->decl
);
2742 if (TREE_CODE (b
->decl
) == FUNCTION_DECL
&& DECL_BUILT_IN (b
->decl
))
2744 = build_type_attribute_variant (thistype
,
2745 TYPE_ATTRIBUTES (b
->u
.type
));
2746 TREE_TYPE (b
->decl
) = thistype
;
2747 bind (name
, b
->decl
, scope
, /*invisible=*/false, /*nested=*/true,
2751 else if (TREE_PUBLIC (x
))
2753 if (visdecl
&& !b
&& duplicate_decls (x
, visdecl
))
2755 /* An external declaration at block scope referring to a
2756 visible entity with internal linkage. The composite
2757 type will already be correct for this scope, so we
2758 just need to fall through to make the declaration in
2765 bind (name
, x
, external_scope
, /*invisible=*/true,
2766 /*nested=*/false, locus
);
2772 if (TREE_CODE (x
) != PARM_DECL
)
2773 warn_if_shadowing (x
);
2775 skip_external_and_shadow_checks
:
2776 if (TREE_CODE (x
) == TYPE_DECL
)
2777 set_underlying_type (x
);
2779 bind (name
, x
, scope
, /*invisible=*/false, nested
, locus
);
2781 /* If x's type is incomplete because it's based on a
2782 structure or union which has not yet been fully declared,
2783 attach it to that structure or union type, so we can go
2784 back and complete the variable declaration later, if the
2785 structure or union gets fully declared.
2787 If the input is erroneous, we can have error_mark in the type
2788 slot (e.g. "f(void a, ...)") - that doesn't count as an
2790 if (TREE_TYPE (x
) != error_mark_node
2791 && !COMPLETE_TYPE_P (TREE_TYPE (x
)))
2793 tree element
= TREE_TYPE (x
);
2795 while (TREE_CODE (element
) == ARRAY_TYPE
)
2796 element
= TREE_TYPE (element
);
2797 element
= TYPE_MAIN_VARIANT (element
);
2799 if ((TREE_CODE (element
) == RECORD_TYPE
2800 || TREE_CODE (element
) == UNION_TYPE
)
2801 && (TREE_CODE (x
) != TYPE_DECL
2802 || TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
)
2803 && !COMPLETE_TYPE_P (element
))
2804 C_TYPE_INCOMPLETE_VARS (element
)
2805 = tree_cons (NULL_TREE
, x
, C_TYPE_INCOMPLETE_VARS (element
));
2810 /* Record X as belonging to file scope.
2811 This is used only internally by the Objective-C front end,
2812 and is limited to its needs. duplicate_decls is not called;
2813 if there is any preexisting decl for this identifier, it is an ICE. */
2816 pushdecl_top_level (tree x
)
2819 bool nested
= false;
2820 gcc_assert (TREE_CODE (x
) == VAR_DECL
|| TREE_CODE (x
) == CONST_DECL
);
2822 name
= DECL_NAME (x
);
2824 gcc_assert (TREE_CODE (x
) == CONST_DECL
|| !I_SYMBOL_BINDING (name
));
2826 if (TREE_PUBLIC (x
))
2828 bind (name
, x
, external_scope
, /*invisible=*/true, /*nested=*/false,
2833 bind (name
, x
, file_scope
, /*invisible=*/false, nested
, UNKNOWN_LOCATION
);
2839 implicit_decl_warning (tree id
, tree olddecl
)
2841 if (warn_implicit_function_declaration
)
2846 warned
= pedwarn (input_location
, OPT_Wimplicit_function_declaration
,
2847 "implicit declaration of function %qE", id
);
2849 warned
= warning (OPT_Wimplicit_function_declaration
,
2850 G_("implicit declaration of function %qE"), id
);
2851 if (olddecl
&& warned
)
2852 locate_old_decl (olddecl
);
2856 /* Generate an implicit declaration for identifier FUNCTIONID at LOC as a
2857 function of type int (). */
2860 implicitly_declare (location_t loc
, tree functionid
)
2862 struct c_binding
*b
;
2866 for (b
= I_SYMBOL_BINDING (functionid
); b
; b
= b
->shadowed
)
2868 if (B_IN_SCOPE (b
, external_scope
))
2877 if (decl
== error_mark_node
)
2880 /* FIXME: Objective-C has weird not-really-builtin functions
2881 which are supposed to be visible automatically. They wind up
2882 in the external scope because they're pushed before the file
2883 scope gets created. Catch this here and rebind them into the
2885 if (!DECL_BUILT_IN (decl
) && DECL_IS_BUILTIN (decl
))
2887 bind (functionid
, decl
, file_scope
,
2888 /*invisible=*/false, /*nested=*/true,
2889 DECL_SOURCE_LOCATION (decl
));
2894 tree newtype
= default_function_type
;
2896 TREE_TYPE (decl
) = b
->u
.type
;
2897 /* Implicit declaration of a function already declared
2898 (somehow) in a different scope, or as a built-in.
2899 If this is the first time this has happened, warn;
2900 then recycle the old declaration but with the new type. */
2901 if (!C_DECL_IMPLICIT (decl
))
2903 implicit_decl_warning (functionid
, decl
);
2904 C_DECL_IMPLICIT (decl
) = 1;
2906 if (DECL_BUILT_IN (decl
))
2908 newtype
= build_type_attribute_variant (newtype
,
2910 (TREE_TYPE (decl
)));
2911 if (!comptypes (newtype
, TREE_TYPE (decl
)))
2913 warning_at (loc
, 0, "incompatible implicit declaration of "
2914 "built-in function %qD", decl
);
2915 newtype
= TREE_TYPE (decl
);
2920 if (!comptypes (newtype
, TREE_TYPE (decl
)))
2922 error_at (loc
, "incompatible implicit declaration of function %qD", decl
);
2923 locate_old_decl (decl
);
2926 b
->u
.type
= TREE_TYPE (decl
);
2927 TREE_TYPE (decl
) = newtype
;
2928 bind (functionid
, decl
, current_scope
,
2929 /*invisible=*/false, /*nested=*/true,
2930 DECL_SOURCE_LOCATION (decl
));
2935 /* Not seen before. */
2936 decl
= build_decl (loc
, FUNCTION_DECL
, functionid
, default_function_type
);
2937 DECL_EXTERNAL (decl
) = 1;
2938 TREE_PUBLIC (decl
) = 1;
2939 C_DECL_IMPLICIT (decl
) = 1;
2940 implicit_decl_warning (functionid
, 0);
2941 asmspec_tree
= maybe_apply_renaming_pragma (decl
, /*asmname=*/NULL
);
2943 set_user_assembler_name (decl
, TREE_STRING_POINTER (asmspec_tree
));
2945 /* C89 says implicit declarations are in the innermost block.
2946 So we record the decl in the standard fashion. */
2947 decl
= pushdecl (decl
);
2949 /* No need to call objc_check_decl here - it's a function type. */
2950 rest_of_decl_compilation (decl
, 0, 0);
2952 /* Write a record describing this implicit function declaration
2953 to the prototypes file (if requested). */
2954 gen_aux_info_record (decl
, 0, 1, 0);
2956 /* Possibly apply some default attributes to this implicit declaration. */
2957 decl_attributes (&decl
, NULL_TREE
, 0);
2962 /* Issue an error message for a reference to an undeclared variable
2963 ID, including a reference to a builtin outside of function-call
2964 context. Establish a binding of the identifier to error_mark_node
2965 in an appropriate scope, which will suppress further errors for the
2966 same identifier. The error message should be given location LOC. */
2968 undeclared_variable (location_t loc
, tree id
)
2970 static bool already
= false;
2971 struct c_scope
*scope
;
2973 if (current_function_decl
== 0)
2975 error_at (loc
, "%qE undeclared here (not in a function)", id
);
2976 scope
= current_scope
;
2980 error_at (loc
, "%qE undeclared (first use in this function)", id
);
2983 inform (loc
, "each undeclared identifier is reported only"
2984 " once for each function it appears in");
2988 /* If we are parsing old-style parameter decls, current_function_decl
2989 will be nonnull but current_function_scope will be null. */
2990 scope
= current_function_scope
? current_function_scope
: current_scope
;
2992 bind (id
, error_mark_node
, scope
, /*invisible=*/false, /*nested=*/false,
2996 /* Subroutine of lookup_label, declare_label, define_label: construct a
2997 LABEL_DECL with all the proper frills. Also create a struct
2998 c_label_vars initialized for the current scope. */
3001 make_label (location_t location
, tree name
, bool defining
,
3002 struct c_label_vars
**p_label_vars
)
3004 tree label
= build_decl (location
, LABEL_DECL
, name
, void_type_node
);
3005 struct c_label_vars
*label_vars
;
3007 DECL_CONTEXT (label
) = current_function_decl
;
3008 DECL_MODE (label
) = VOIDmode
;
3010 label_vars
= ggc_alloc_c_label_vars ();
3011 label_vars
->shadowed
= NULL
;
3012 set_spot_bindings (&label_vars
->label_bindings
, defining
);
3013 label_vars
->decls_in_scope
= make_tree_vector ();
3014 label_vars
->gotos
= VEC_alloc (c_goto_bindings_p
, gc
, 0);
3015 *p_label_vars
= label_vars
;
3020 /* Get the LABEL_DECL corresponding to identifier NAME as a label.
3021 Create one if none exists so far for the current function.
3022 This is called when a label is used in a goto expression or
3023 has its address taken. */
3026 lookup_label (tree name
)
3029 struct c_label_vars
*label_vars
;
3031 if (current_function_decl
== 0)
3033 error ("label %qE referenced outside of any function", name
);
3037 /* Use a label already defined or ref'd with this name, but not if
3038 it is inherited from a containing function and wasn't declared
3040 label
= I_LABEL_DECL (name
);
3041 if (label
&& (DECL_CONTEXT (label
) == current_function_decl
3042 || C_DECLARED_LABEL_FLAG (label
)))
3044 /* If the label has only been declared, update its apparent
3045 location to point here, for better diagnostics if it
3046 turns out not to have been defined. */
3047 if (DECL_INITIAL (label
) == NULL_TREE
)
3048 DECL_SOURCE_LOCATION (label
) = input_location
;
3052 /* No label binding for that identifier; make one. */
3053 label
= make_label (input_location
, name
, false, &label_vars
);
3055 /* Ordinary labels go in the current function scope. */
3056 bind_label (name
, label
, current_function_scope
, label_vars
);
3061 /* Issue a warning about DECL for a goto statement at GOTO_LOC going
3065 warn_about_goto (location_t goto_loc
, tree label
, tree decl
)
3067 if (variably_modified_type_p (TREE_TYPE (decl
), NULL_TREE
))
3069 "jump into scope of identifier with variably modified type");
3071 warning_at (goto_loc
, OPT_Wjump_misses_init
,
3072 "jump skips variable initialization");
3073 inform (DECL_SOURCE_LOCATION (label
), "label %qD defined here", label
);
3074 inform (DECL_SOURCE_LOCATION (decl
), "%qD declared here", decl
);
3077 /* Look up a label because of a goto statement. This is like
3078 lookup_label, but also issues any appropriate warnings. */
3081 lookup_label_for_goto (location_t loc
, tree name
)
3084 struct c_label_vars
*label_vars
;
3088 label
= lookup_label (name
);
3089 if (label
== NULL_TREE
)
3092 /* If we are jumping to a different function, we can't issue any
3094 if (DECL_CONTEXT (label
) != current_function_decl
)
3096 gcc_assert (C_DECLARED_LABEL_FLAG (label
));
3100 label_vars
= I_LABEL_BINDING (name
)->u
.label
;
3102 /* If the label has not yet been defined, then push this goto on a
3103 list for possible later warnings. */
3104 if (label_vars
->label_bindings
.scope
== NULL
)
3106 struct c_goto_bindings
*g
;
3108 g
= ggc_alloc_c_goto_bindings ();
3110 set_spot_bindings (&g
->goto_bindings
, true);
3111 VEC_safe_push (c_goto_bindings_p
, gc
, label_vars
->gotos
, g
);
3115 /* If there are any decls in label_vars->decls_in_scope, then this
3116 goto has missed the declaration of the decl. This happens for a
3122 Issue a warning or error. */
3123 for (ix
= 0; VEC_iterate (tree
, label_vars
->decls_in_scope
, ix
, decl
); ++ix
)
3124 warn_about_goto (loc
, label
, decl
);
3126 if (label_vars
->label_bindings
.left_stmt_expr
)
3128 error_at (loc
, "jump into statement expression");
3129 inform (DECL_SOURCE_LOCATION (label
), "label %qD defined here", label
);
3135 /* Make a label named NAME in the current function, shadowing silently
3136 any that may be inherited from containing functions or containing
3137 scopes. This is called for __label__ declarations. */
3140 declare_label (tree name
)
3142 struct c_binding
*b
= I_LABEL_BINDING (name
);
3144 struct c_label_vars
*label_vars
;
3146 /* Check to make sure that the label hasn't already been declared
3148 if (b
&& B_IN_CURRENT_SCOPE (b
))
3150 error ("duplicate label declaration %qE", name
);
3151 locate_old_decl (b
->decl
);
3153 /* Just use the previous declaration. */
3157 label
= make_label (input_location
, name
, false, &label_vars
);
3158 C_DECLARED_LABEL_FLAG (label
) = 1;
3160 /* Declared labels go in the current scope. */
3161 bind_label (name
, label
, current_scope
, label_vars
);
3166 /* When we define a label, issue any appropriate warnings if there are
3167 any gotos earlier in the function which jump to this label. */
3170 check_earlier_gotos (tree label
, struct c_label_vars
* label_vars
)
3173 struct c_goto_bindings
*g
;
3176 VEC_iterate (c_goto_bindings_p
, label_vars
->gotos
, ix
, g
);
3179 struct c_binding
*b
;
3180 struct c_scope
*scope
;
3182 /* We have a goto to this label. The goto is going forward. In
3183 g->scope, the goto is going to skip any binding which was
3184 defined after g->bindings_in_scope. */
3185 for (b
= g
->goto_bindings
.scope
->bindings
;
3186 b
!= g
->goto_bindings
.bindings_in_scope
;
3189 if (decl_jump_unsafe (b
->decl
))
3190 warn_about_goto (g
->loc
, label
, b
->decl
);
3193 /* We also need to warn about decls defined in any scopes
3194 between the scope of the label and the scope of the goto. */
3195 for (scope
= label_vars
->label_bindings
.scope
;
3196 scope
!= g
->goto_bindings
.scope
;
3197 scope
= scope
->outer
)
3199 gcc_assert (scope
!= NULL
);
3200 if (scope
== label_vars
->label_bindings
.scope
)
3201 b
= label_vars
->label_bindings
.bindings_in_scope
;
3203 b
= scope
->bindings
;
3204 for (; b
!= NULL
; b
= b
->prev
)
3206 if (decl_jump_unsafe (b
->decl
))
3207 warn_about_goto (g
->loc
, label
, b
->decl
);
3211 if (g
->goto_bindings
.stmt_exprs
> 0)
3213 error_at (g
->loc
, "jump into statement expression");
3214 inform (DECL_SOURCE_LOCATION (label
), "label %qD defined here",
3219 /* Now that the label is defined, we will issue warnings about
3220 subsequent gotos to this label when we see them. */
3221 VEC_truncate (c_goto_bindings_p
, label_vars
->gotos
, 0);
3222 label_vars
->gotos
= NULL
;
3225 /* Define a label, specifying the location in the source file.
3226 Return the LABEL_DECL node for the label, if the definition is valid.
3227 Otherwise return 0. */
3230 define_label (location_t location
, tree name
)
3232 /* Find any preexisting label with this name. It is an error
3233 if that label has already been defined in this function, or
3234 if there is a containing function with a declared label with
3236 tree label
= I_LABEL_DECL (name
);
3239 && ((DECL_CONTEXT (label
) == current_function_decl
3240 && DECL_INITIAL (label
) != 0)
3241 || (DECL_CONTEXT (label
) != current_function_decl
3242 && C_DECLARED_LABEL_FLAG (label
))))
3244 error_at (location
, "duplicate label %qD", label
);
3245 locate_old_decl (label
);
3248 else if (label
&& DECL_CONTEXT (label
) == current_function_decl
)
3250 struct c_label_vars
*label_vars
= I_LABEL_BINDING (name
)->u
.label
;
3252 /* The label has been used or declared already in this function,
3253 but not defined. Update its location to point to this
3255 DECL_SOURCE_LOCATION (label
) = location
;
3256 set_spot_bindings (&label_vars
->label_bindings
, true);
3258 /* Issue warnings as required about any goto statements from
3259 earlier in the function. */
3260 check_earlier_gotos (label
, label_vars
);
3264 struct c_label_vars
*label_vars
;
3266 /* No label binding for that identifier; make one. */
3267 label
= make_label (location
, name
, true, &label_vars
);
3269 /* Ordinary labels go in the current function scope. */
3270 bind_label (name
, label
, current_function_scope
, label_vars
);
3273 if (!in_system_header
&& lookup_name (name
))
3274 warning_at (location
, OPT_Wtraditional
,
3275 "traditional C lacks a separate namespace "
3276 "for labels, identifier %qE conflicts", name
);
3278 /* Mark label as having been defined. */
3279 DECL_INITIAL (label
) = error_mark_node
;
3283 /* Get the bindings for a new switch statement. This is used to issue
3284 warnings as appropriate for jumps from the switch to case or
3287 struct c_spot_bindings
*
3288 c_get_switch_bindings (void)
3290 struct c_spot_bindings
*switch_bindings
;
3292 switch_bindings
= XNEW (struct c_spot_bindings
);
3293 set_spot_bindings (switch_bindings
, true);
3294 return switch_bindings
;
3298 c_release_switch_bindings (struct c_spot_bindings
*bindings
)
3300 gcc_assert (bindings
->stmt_exprs
== 0 && !bindings
->left_stmt_expr
);
3304 /* This is called at the point of a case or default label to issue
3305 warnings about decls as needed. It returns true if it found an
3306 error, not just a warning. */
3309 c_check_switch_jump_warnings (struct c_spot_bindings
*switch_bindings
,
3310 location_t switch_loc
, location_t case_loc
)
3313 struct c_scope
*scope
;
3316 for (scope
= current_scope
;
3317 scope
!= switch_bindings
->scope
;
3318 scope
= scope
->outer
)
3320 struct c_binding
*b
;
3322 gcc_assert (scope
!= NULL
);
3323 for (b
= scope
->bindings
; b
!= NULL
; b
= b
->prev
)
3325 if (decl_jump_unsafe (b
->decl
))
3327 if (variably_modified_type_p (TREE_TYPE (b
->decl
), NULL_TREE
))
3331 ("switch jumps into scope of identifier with "
3332 "variably modified type"));
3335 warning_at (case_loc
, OPT_Wjump_misses_init
,
3336 "switch jumps over variable initialization");
3337 inform (switch_loc
, "switch starts here");
3338 inform (DECL_SOURCE_LOCATION (b
->decl
), "%qD declared here",
3344 if (switch_bindings
->stmt_exprs
> 0)
3347 error_at (case_loc
, "switch jumps into statement expression");
3348 inform (switch_loc
, "switch starts here");
3354 /* Given NAME, an IDENTIFIER_NODE,
3355 return the structure (or union or enum) definition for that name.
3356 If THISLEVEL_ONLY is nonzero, searches only the current_scope.
3357 CODE says which kind of type the caller wants;
3358 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
3359 If PLOC is not NULL and this returns non-null, it sets *PLOC to the
3360 location where the tag was defined.
3361 If the wrong kind of type is found, an error is reported. */
3364 lookup_tag (enum tree_code code
, tree name
, int thislevel_only
,
3367 struct c_binding
*b
= I_TAG_BINDING (name
);
3373 /* We only care about whether it's in this level if
3374 thislevel_only was set or it might be a type clash. */
3375 if (thislevel_only
|| TREE_CODE (b
->decl
) != code
)
3377 /* For our purposes, a tag in the external scope is the same as
3378 a tag in the file scope. (Primarily relevant to Objective-C
3379 and its builtin structure tags, which get pushed before the
3380 file scope is created.) */
3381 if (B_IN_CURRENT_SCOPE (b
)
3382 || (current_scope
== file_scope
&& B_IN_EXTERNAL_SCOPE (b
)))
3386 if (thislevel_only
&& !thislevel
)
3389 if (TREE_CODE (b
->decl
) != code
)
3391 /* Definition isn't the kind we were looking for. */
3392 pending_invalid_xref
= name
;
3393 pending_invalid_xref_location
= input_location
;
3395 /* If in the same binding level as a declaration as a tag
3396 of a different type, this must not be allowed to
3397 shadow that tag, so give the error immediately.
3398 (For example, "struct foo; union foo;" is invalid.) */
3400 pending_xref_error ();
3409 /* Print an error message now
3410 for a recent invalid struct, union or enum cross reference.
3411 We don't print them immediately because they are not invalid
3412 when used in the `struct foo;' construct for shadowing. */
3415 pending_xref_error (void)
3417 if (pending_invalid_xref
!= 0)
3418 error_at (pending_invalid_xref_location
, "%qE defined as wrong kind of tag",
3419 pending_invalid_xref
);
3420 pending_invalid_xref
= 0;
3424 /* Look up NAME in the current scope and its superiors
3425 in the namespace of variables, functions and typedefs.
3426 Return a ..._DECL node of some kind representing its definition,
3427 or return 0 if it is undefined. */
3430 lookup_name (tree name
)
3432 struct c_binding
*b
= I_SYMBOL_BINDING (name
);
3433 if (b
&& !b
->invisible
)
3438 /* Similar to `lookup_name' but look only at the indicated scope. */
3441 lookup_name_in_scope (tree name
, struct c_scope
*scope
)
3443 struct c_binding
*b
;
3445 for (b
= I_SYMBOL_BINDING (name
); b
; b
= b
->shadowed
)
3446 if (B_IN_SCOPE (b
, scope
))
3451 /* Create the predefined scalar types of C,
3452 and some nodes representing standard constants (0, 1, (void *) 0).
3453 Initialize the global scope.
3454 Make definitions for built-in primitive functions. */
3457 c_init_decl_processing (void)
3459 location_t save_loc
= input_location
;
3461 /* Initialize reserved words for parser. */
3464 current_function_decl
= 0;
3466 gcc_obstack_init (&parser_obstack
);
3468 /* Make the externals scope. */
3470 external_scope
= current_scope
;
3472 /* Declarations from c_common_nodes_and_builtins must not be associated
3473 with this input file, lest we get differences between using and not
3474 using preprocessed headers. */
3475 input_location
= BUILTINS_LOCATION
;
3477 build_common_tree_nodes (flag_signed_char
);
3479 c_common_nodes_and_builtins ();
3481 /* In C, comparisons and TRUTH_* expressions have type int. */
3482 truthvalue_type_node
= integer_type_node
;
3483 truthvalue_true_node
= integer_one_node
;
3484 truthvalue_false_node
= integer_zero_node
;
3486 /* Even in C99, which has a real boolean type. */
3487 pushdecl (build_decl (UNKNOWN_LOCATION
, TYPE_DECL
, get_identifier ("_Bool"),
3488 boolean_type_node
));
3490 input_location
= save_loc
;
3492 pedantic_lvalues
= true;
3494 make_fname_decl
= c_make_fname_decl
;
3495 start_fname_decls ();
3498 /* Create the VAR_DECL at LOC for __FUNCTION__ etc. ID is the name to
3499 give the decl, NAME is the initialization string and TYPE_DEP
3500 indicates whether NAME depended on the type of the function. As we
3501 don't yet implement delayed emission of static data, we mark the
3502 decl as emitted so it is not placed in the output. Anything using
3503 it must therefore pull out the STRING_CST initializer directly.
3507 c_make_fname_decl (location_t loc
, tree id
, int type_dep
)
3509 const char *name
= fname_as_string (type_dep
);
3510 tree decl
, type
, init
;
3511 size_t length
= strlen (name
);
3513 type
= build_array_type (char_type_node
,
3514 build_index_type (size_int (length
)));
3515 type
= c_build_qualified_type (type
, TYPE_QUAL_CONST
);
3517 decl
= build_decl (loc
, VAR_DECL
, id
, type
);
3519 TREE_STATIC (decl
) = 1;
3520 TREE_READONLY (decl
) = 1;
3521 DECL_ARTIFICIAL (decl
) = 1;
3523 init
= build_string (length
+ 1, name
);
3524 free (CONST_CAST (char *, name
));
3525 TREE_TYPE (init
) = type
;
3526 DECL_INITIAL (decl
) = init
;
3528 TREE_USED (decl
) = 1;
3530 if (current_function_decl
3531 /* For invalid programs like this:
3534 const char* p = __FUNCTION__;
3536 the __FUNCTION__ is believed to appear in K&R style function
3537 parameter declarator. In that case we still don't have
3539 && (!seen_error () || current_function_scope
))
3541 DECL_CONTEXT (decl
) = current_function_decl
;
3542 bind (id
, decl
, current_function_scope
,
3543 /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION
);
3546 finish_decl (decl
, loc
, init
, NULL_TREE
, NULL_TREE
);
3552 c_builtin_function (tree decl
)
3554 tree type
= TREE_TYPE (decl
);
3555 tree id
= DECL_NAME (decl
);
3557 const char *name
= IDENTIFIER_POINTER (id
);
3558 C_DECL_BUILTIN_PROTOTYPE (decl
) = (TYPE_ARG_TYPES (type
) != 0);
3560 /* Should never be called on a symbol with a preexisting meaning. */
3561 gcc_assert (!I_SYMBOL_BINDING (id
));
3563 bind (id
, decl
, external_scope
, /*invisible=*/true, /*nested=*/false,
3566 /* Builtins in the implementation namespace are made visible without
3567 needing to be explicitly declared. See push_file_scope. */
3568 if (name
[0] == '_' && (name
[1] == '_' || ISUPPER (name
[1])))
3570 DECL_CHAIN (decl
) = visible_builtins
;
3571 visible_builtins
= decl
;
3578 c_builtin_function_ext_scope (tree decl
)
3580 tree type
= TREE_TYPE (decl
);
3581 tree id
= DECL_NAME (decl
);
3583 const char *name
= IDENTIFIER_POINTER (id
);
3584 C_DECL_BUILTIN_PROTOTYPE (decl
) = (TYPE_ARG_TYPES (type
) != 0);
3586 /* Should never be called on a symbol with a preexisting meaning. */
3587 gcc_assert (!I_SYMBOL_BINDING (id
));
3589 bind (id
, decl
, external_scope
, /*invisible=*/false, /*nested=*/false,
3592 /* Builtins in the implementation namespace are made visible without
3593 needing to be explicitly declared. See push_file_scope. */
3594 if (name
[0] == '_' && (name
[1] == '_' || ISUPPER (name
[1])))
3596 DECL_CHAIN (decl
) = visible_builtins
;
3597 visible_builtins
= decl
;
3603 /* Called when a declaration is seen that contains no names to declare.
3604 If its type is a reference to a structure, union or enum inherited
3605 from a containing scope, shadow that tag name for the current scope
3606 with a forward reference.
3607 If its type defines a new named structure or union
3608 or defines an enum, it is valid but we need not do anything here.
3609 Otherwise, it is an error. */
3612 shadow_tag (const struct c_declspecs
*declspecs
)
3614 shadow_tag_warned (declspecs
, 0);
3617 /* WARNED is 1 if we have done a pedwarn, 2 if we have done a warning,
3620 shadow_tag_warned (const struct c_declspecs
*declspecs
, int warned
)
3622 bool found_tag
= false;
3624 if (declspecs
->type
&& !declspecs
->default_int_p
&& !declspecs
->typedef_p
)
3626 tree value
= declspecs
->type
;
3627 enum tree_code code
= TREE_CODE (value
);
3629 if (code
== RECORD_TYPE
|| code
== UNION_TYPE
|| code
== ENUMERAL_TYPE
)
3630 /* Used to test also that TYPE_SIZE (value) != 0.
3631 That caused warning for `struct foo;' at top level in the file. */
3633 tree name
= TYPE_NAME (value
);
3638 if (declspecs
->restrict_p
)
3640 error ("invalid use of %<restrict%>");
3646 if (warned
!= 1 && code
!= ENUMERAL_TYPE
)
3647 /* Empty unnamed enum OK */
3649 pedwarn (input_location
, 0,
3650 "unnamed struct/union that defines no instances");
3654 else if (!declspecs
->tag_defined_p
3655 && declspecs
->storage_class
!= csc_none
)
3658 pedwarn (input_location
, 0,
3659 "empty declaration with storage class specifier "
3660 "does not redeclare tag");
3662 pending_xref_error ();
3664 else if (!declspecs
->tag_defined_p
3665 && (declspecs
->const_p
3666 || declspecs
->volatile_p
3667 || declspecs
->restrict_p
3668 || declspecs
->address_space
))
3671 pedwarn (input_location
, 0,
3672 "empty declaration with type qualifier "
3673 "does not redeclare tag");
3675 pending_xref_error ();
3679 pending_invalid_xref
= 0;
3680 t
= lookup_tag (code
, name
, 1, NULL
);
3684 t
= make_node (code
);
3685 pushtag (input_location
, name
, t
);
3691 if (warned
!= 1 && !in_system_header
)
3693 pedwarn (input_location
, 0,
3694 "useless type name in empty declaration");
3699 else if (warned
!= 1 && !in_system_header
&& declspecs
->typedef_p
)
3701 pedwarn (input_location
, 0, "useless type name in empty declaration");
3705 pending_invalid_xref
= 0;
3707 if (declspecs
->inline_p
)
3709 error ("%<inline%> in empty declaration");
3713 if (current_scope
== file_scope
&& declspecs
->storage_class
== csc_auto
)
3715 error ("%<auto%> in file-scope empty declaration");
3719 if (current_scope
== file_scope
&& declspecs
->storage_class
== csc_register
)
3721 error ("%<register%> in file-scope empty declaration");
3725 if (!warned
&& !in_system_header
&& declspecs
->storage_class
!= csc_none
)
3727 warning (0, "useless storage class specifier in empty declaration");
3731 if (!warned
&& !in_system_header
&& declspecs
->thread_p
)
3733 warning (0, "useless %<__thread%> in empty declaration");
3737 if (!warned
&& !in_system_header
&& (declspecs
->const_p
3738 || declspecs
->volatile_p
3739 || declspecs
->restrict_p
3740 || declspecs
->address_space
))
3742 warning (0, "useless type qualifier in empty declaration");
3749 pedwarn (input_location
, 0, "empty declaration");
3754 /* Return the qualifiers from SPECS as a bitwise OR of TYPE_QUAL_*
3755 bits. SPECS represents declaration specifiers that the grammar
3756 only permits to contain type qualifiers and attributes. */
3759 quals_from_declspecs (const struct c_declspecs
*specs
)
3761 int quals
= ((specs
->const_p
? TYPE_QUAL_CONST
: 0)
3762 | (specs
->volatile_p
? TYPE_QUAL_VOLATILE
: 0)
3763 | (specs
->restrict_p
? TYPE_QUAL_RESTRICT
: 0)
3764 | (ENCODE_QUAL_ADDR_SPACE (specs
->address_space
)));
3765 gcc_assert (!specs
->type
3766 && !specs
->decl_attr
3767 && specs
->typespec_word
== cts_none
3768 && specs
->storage_class
== csc_none
3769 && !specs
->typedef_p
3770 && !specs
->explicit_signed_p
3771 && !specs
->deprecated_p
3773 && !specs
->long_long_p
3776 && !specs
->unsigned_p
3777 && !specs
->complex_p
3779 && !specs
->thread_p
);
3783 /* Construct an array declarator. LOC is the location of the
3784 beginning of the array (usually the opening brace). EXPR is the
3785 expression inside [], or NULL_TREE. QUALS are the type qualifiers
3786 inside the [] (to be applied to the pointer to which a parameter
3787 array is converted). STATIC_P is true if "static" is inside the
3788 [], false otherwise. VLA_UNSPEC_P is true if the array is [*], a
3789 VLA of unspecified length which is nevertheless a complete type,
3790 false otherwise. The field for the contained declarator is left to
3791 be filled in by set_array_declarator_inner. */
3793 struct c_declarator
*
3794 build_array_declarator (location_t loc
,
3795 tree expr
, struct c_declspecs
*quals
, bool static_p
,
3798 struct c_declarator
*declarator
= XOBNEW (&parser_obstack
,
3799 struct c_declarator
);
3800 declarator
->id_loc
= loc
;
3801 declarator
->kind
= cdk_array
;
3802 declarator
->declarator
= 0;
3803 declarator
->u
.array
.dimen
= expr
;
3806 declarator
->u
.array
.attrs
= quals
->attrs
;
3807 declarator
->u
.array
.quals
= quals_from_declspecs (quals
);
3811 declarator
->u
.array
.attrs
= NULL_TREE
;
3812 declarator
->u
.array
.quals
= 0;
3814 declarator
->u
.array
.static_p
= static_p
;
3815 declarator
->u
.array
.vla_unspec_p
= vla_unspec_p
;
3818 if (static_p
|| quals
!= NULL
)
3819 pedwarn (loc
, OPT_pedantic
,
3820 "ISO C90 does not support %<static%> or type "
3821 "qualifiers in parameter array declarators");
3823 pedwarn (loc
, OPT_pedantic
,
3824 "ISO C90 does not support %<[*]%> array declarators");
3828 if (!current_scope
->parm_flag
)
3831 error_at (loc
, "%<[*]%> not allowed in other than "
3832 "function prototype scope");
3833 declarator
->u
.array
.vla_unspec_p
= false;
3836 current_scope
->had_vla_unspec
= true;
3841 /* Set the contained declarator of an array declarator. DECL is the
3842 declarator, as constructed by build_array_declarator; INNER is what
3843 appears on the left of the []. */
3845 struct c_declarator
*
3846 set_array_declarator_inner (struct c_declarator
*decl
,
3847 struct c_declarator
*inner
)
3849 decl
->declarator
= inner
;
3853 /* INIT is a constructor that forms DECL's initializer. If the final
3854 element initializes a flexible array field, add the size of that
3855 initializer to DECL's size. */
3858 add_flexible_array_elts_to_size (tree decl
, tree init
)
3862 if (VEC_empty (constructor_elt
, CONSTRUCTOR_ELTS (init
)))
3865 elt
= VEC_last (constructor_elt
, CONSTRUCTOR_ELTS (init
))->value
;
3866 type
= TREE_TYPE (elt
);
3867 if (TREE_CODE (type
) == ARRAY_TYPE
3868 && TYPE_SIZE (type
) == NULL_TREE
3869 && TYPE_DOMAIN (type
) != NULL_TREE
3870 && TYPE_MAX_VALUE (TYPE_DOMAIN (type
)) == NULL_TREE
)
3872 complete_array_type (&type
, elt
, false);
3874 = size_binop (PLUS_EXPR
, DECL_SIZE (decl
), TYPE_SIZE (type
));
3875 DECL_SIZE_UNIT (decl
)
3876 = size_binop (PLUS_EXPR
, DECL_SIZE_UNIT (decl
), TYPE_SIZE_UNIT (type
));
3880 /* Decode a "typename", such as "int **", returning a ..._TYPE node.
3881 Set *EXPR, if EXPR not NULL, to any expression to be evaluated
3882 before the type name, and set *EXPR_CONST_OPERANDS, if
3883 EXPR_CONST_OPERANDS not NULL, to indicate whether the type name may
3884 appear in a constant expression. */
3887 groktypename (struct c_type_name
*type_name
, tree
*expr
,
3888 bool *expr_const_operands
)
3891 tree attrs
= type_name
->specs
->attrs
;
3893 type_name
->specs
->attrs
= NULL_TREE
;
3895 type
= grokdeclarator (type_name
->declarator
, type_name
->specs
, TYPENAME
,
3896 false, NULL
, &attrs
, expr
, expr_const_operands
,
3899 /* Apply attributes. */
3900 decl_attributes (&type
, attrs
, 0);
3905 /* Decode a declarator in an ordinary declaration or data definition.
3906 This is called as soon as the type information and variable name
3907 have been parsed, before parsing the initializer if any.
3908 Here we create the ..._DECL node, fill in its type,
3909 and put it on the list of decls for the current context.
3910 The ..._DECL node is returned as the value.
3912 Exception: for arrays where the length is not specified,
3913 the type is left null, to be filled in by `finish_decl'.
3915 Function definitions do not come here; they go to start_function
3916 instead. However, external and forward declarations of functions
3917 do go through here. Structure field declarations are done by
3918 grokfield and not through here. */
3921 start_decl (struct c_declarator
*declarator
, struct c_declspecs
*declspecs
,
3922 bool initialized
, tree attributes
)
3926 tree expr
= NULL_TREE
;
3927 enum deprecated_states deprecated_state
= DEPRECATED_NORMAL
;
3929 /* An object declared as __attribute__((deprecated)) suppresses
3930 warnings of uses of other deprecated items. */
3931 if (lookup_attribute ("deprecated", attributes
))
3932 deprecated_state
= DEPRECATED_SUPPRESS
;
3934 decl
= grokdeclarator (declarator
, declspecs
,
3935 NORMAL
, initialized
, NULL
, &attributes
, &expr
, NULL
,
3943 if (TREE_CODE (decl
) != FUNCTION_DECL
&& MAIN_NAME_P (DECL_NAME (decl
)))
3944 warning (OPT_Wmain
, "%q+D is usually a function", decl
);
3947 /* Is it valid for this decl to have an initializer at all?
3948 If not, set INITIALIZED to zero, which will indirectly
3949 tell 'finish_decl' to ignore the initializer once it is parsed. */
3950 switch (TREE_CODE (decl
))
3953 error ("typedef %qD is initialized (use __typeof__ instead)", decl
);
3958 error ("function %qD is initialized like a variable", decl
);
3963 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3964 error ("parameter %qD is initialized", decl
);
3969 /* Don't allow initializations for incomplete types except for
3970 arrays which might be completed by the initialization. */
3972 /* This can happen if the array size is an undefined macro.
3973 We already gave a warning, so we don't need another one. */
3974 if (TREE_TYPE (decl
) == error_mark_node
)
3976 else if (COMPLETE_TYPE_P (TREE_TYPE (decl
)))
3978 /* A complete type is ok if size is fixed. */
3980 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl
))) != INTEGER_CST
3981 || C_DECL_VARIABLE_SIZE (decl
))
3983 error ("variable-sized object may not be initialized");
3987 else if (TREE_CODE (TREE_TYPE (decl
)) != ARRAY_TYPE
)
3989 error ("variable %qD has initializer but incomplete type", decl
);
3992 else if (C_DECL_VARIABLE_SIZE (decl
))
3994 /* Although C99 is unclear about whether incomplete arrays
3995 of VLAs themselves count as VLAs, it does not make
3996 sense to permit them to be initialized given that
3997 ordinary VLAs may not be initialized. */
3998 error ("variable-sized object may not be initialized");
4005 if (current_scope
== file_scope
)
4006 TREE_STATIC (decl
) = 1;
4008 /* Tell 'pushdecl' this is an initialized decl
4009 even though we don't yet have the initializer expression.
4010 Also tell 'finish_decl' it may store the real initializer. */
4011 DECL_INITIAL (decl
) = error_mark_node
;
4014 /* If this is a function declaration, write a record describing it to the
4015 prototypes file (if requested). */
4017 if (TREE_CODE (decl
) == FUNCTION_DECL
)
4018 gen_aux_info_record (decl
, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl
)) != 0);
4020 /* ANSI specifies that a tentative definition which is not merged with
4021 a non-tentative definition behaves exactly like a definition with an
4022 initializer equal to zero. (Section 3.7.2)
4024 -fno-common gives strict ANSI behavior, though this tends to break
4025 a large body of code that grew up without this rule.
4027 Thread-local variables are never common, since there's no entrenched
4028 body of code to break, and it allows more efficient variable references
4029 in the presence of dynamic linking. */
4031 if (TREE_CODE (decl
) == VAR_DECL
4033 && TREE_PUBLIC (decl
)
4034 && !DECL_THREAD_LOCAL_P (decl
)
4036 DECL_COMMON (decl
) = 1;
4038 /* Set attributes here so if duplicate decl, will have proper attributes. */
4039 decl_attributes (&decl
, attributes
, 0);
4041 /* Handle gnu_inline attribute. */
4042 if (declspecs
->inline_p
4043 && !flag_gnu89_inline
4044 && TREE_CODE (decl
) == FUNCTION_DECL
4045 && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl
))
4046 || current_function_decl
))
4048 if (declspecs
->storage_class
== csc_auto
&& current_scope
!= file_scope
)
4050 else if (declspecs
->storage_class
!= csc_static
)
4051 DECL_EXTERNAL (decl
) = !DECL_EXTERNAL (decl
);
4054 if (TREE_CODE (decl
) == FUNCTION_DECL
4055 && targetm
.calls
.promote_prototypes (TREE_TYPE (decl
)))
4057 struct c_declarator
*ce
= declarator
;
4059 if (ce
->kind
== cdk_pointer
)
4060 ce
= declarator
->declarator
;
4061 if (ce
->kind
== cdk_function
)
4063 tree args
= ce
->u
.arg_info
->parms
;
4064 for (; args
; args
= DECL_CHAIN (args
))
4066 tree type
= TREE_TYPE (args
);
4067 if (type
&& INTEGRAL_TYPE_P (type
)
4068 && TYPE_PRECISION (type
) < TYPE_PRECISION (integer_type_node
))
4069 DECL_ARG_TYPE (args
) = integer_type_node
;
4074 if (TREE_CODE (decl
) == FUNCTION_DECL
4075 && DECL_DECLARED_INLINE_P (decl
)
4076 && DECL_UNINLINABLE (decl
)
4077 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl
)))
4078 warning (OPT_Wattributes
, "inline function %q+D given attribute noinline",
4081 /* C99 6.7.4p3: An inline definition of a function with external
4082 linkage shall not contain a definition of a modifiable object
4083 with static storage duration... */
4084 if (TREE_CODE (decl
) == VAR_DECL
4085 && current_scope
!= file_scope
4086 && TREE_STATIC (decl
)
4087 && !TREE_READONLY (decl
)
4088 && DECL_DECLARED_INLINE_P (current_function_decl
)
4089 && DECL_EXTERNAL (current_function_decl
))
4090 record_inline_static (input_location
, current_function_decl
,
4091 decl
, csi_modifiable
);
4093 /* Add this decl to the current scope.
4094 TEM may equal DECL or it may be a previous decl of the same name. */
4095 tem
= pushdecl (decl
);
4097 if (initialized
&& DECL_EXTERNAL (tem
))
4099 DECL_EXTERNAL (tem
) = 0;
4100 TREE_STATIC (tem
) = 1;
4106 /* Finish processing of a declaration;
4107 install its initial value.
4108 If ORIGTYPE is not NULL_TREE, it is the original type of INIT.
4109 If the length of an array type is not known before,
4110 it must be determined now, from the initial value, or it is an error.
4112 INIT_LOC is the location of the initial value. */
4115 finish_decl (tree decl
, location_t init_loc
, tree init
,
4116 tree origtype
, tree asmspec_tree
)
4119 bool was_incomplete
= (DECL_SIZE (decl
) == 0);
4120 const char *asmspec
= 0;
4122 /* If a name was specified, get the string. */
4123 if ((TREE_CODE (decl
) == FUNCTION_DECL
|| TREE_CODE (decl
) == VAR_DECL
)
4124 && DECL_FILE_SCOPE_P (decl
))
4125 asmspec_tree
= maybe_apply_renaming_pragma (decl
, asmspec_tree
);
4127 asmspec
= TREE_STRING_POINTER (asmspec_tree
);
4129 if (TREE_CODE (decl
) == VAR_DECL
4130 && TREE_STATIC (decl
)
4131 && global_bindings_p ())
4132 /* So decl is a global variable. Record the types it uses
4133 so that we can decide later to emit debug info for them. */
4134 record_types_used_by_current_var_decl (decl
);
4136 /* If `start_decl' didn't like having an initialization, ignore it now. */
4137 if (init
!= 0 && DECL_INITIAL (decl
) == 0)
4140 /* Don't crash if parm is initialized. */
4141 if (TREE_CODE (decl
) == PARM_DECL
)
4145 store_init_value (init_loc
, decl
, init
, origtype
);
4147 if (c_dialect_objc () && (TREE_CODE (decl
) == VAR_DECL
4148 || TREE_CODE (decl
) == FUNCTION_DECL
4149 || TREE_CODE (decl
) == FIELD_DECL
))
4150 objc_check_decl (decl
);
4152 type
= TREE_TYPE (decl
);
4154 /* Deduce size of array from initialization, if not already known. */
4155 if (TREE_CODE (type
) == ARRAY_TYPE
4156 && TYPE_DOMAIN (type
) == 0
4157 && TREE_CODE (decl
) != TYPE_DECL
)
4160 = (TREE_STATIC (decl
)
4161 /* Even if pedantic, an external linkage array
4162 may have incomplete type at first. */
4163 ? pedantic
&& !TREE_PUBLIC (decl
)
4164 : !DECL_EXTERNAL (decl
));
4166 = complete_array_type (&TREE_TYPE (decl
), DECL_INITIAL (decl
),
4169 /* Get the completed type made by complete_array_type. */
4170 type
= TREE_TYPE (decl
);
4175 error ("initializer fails to determine size of %q+D", decl
);
4180 error ("array size missing in %q+D", decl
);
4181 /* If a `static' var's size isn't known,
4182 make it extern as well as static, so it does not get
4184 If it is not `static', then do not mark extern;
4185 finish_incomplete_decl will give it a default size
4186 and it will get allocated. */
4187 else if (!pedantic
&& TREE_STATIC (decl
) && !TREE_PUBLIC (decl
))
4188 DECL_EXTERNAL (decl
) = 1;
4192 error ("zero or negative size array %q+D", decl
);
4196 /* For global variables, update the copy of the type that
4197 exists in the binding. */
4198 if (TREE_PUBLIC (decl
))
4200 struct c_binding
*b_ext
= I_SYMBOL_BINDING (DECL_NAME (decl
));
4201 while (b_ext
&& !B_IN_EXTERNAL_SCOPE (b_ext
))
4202 b_ext
= b_ext
->shadowed
;
4206 b_ext
->u
.type
= composite_type (b_ext
->u
.type
, type
);
4208 b_ext
->u
.type
= type
;
4217 if (DECL_INITIAL (decl
))
4218 TREE_TYPE (DECL_INITIAL (decl
)) = type
;
4220 layout_decl (decl
, 0);
4223 if (TREE_CODE (decl
) == VAR_DECL
)
4225 if (init
&& TREE_CODE (init
) == CONSTRUCTOR
)
4226 add_flexible_array_elts_to_size (decl
, init
);
4228 if (DECL_SIZE (decl
) == 0 && TREE_TYPE (decl
) != error_mark_node
4229 && COMPLETE_TYPE_P (TREE_TYPE (decl
)))
4230 layout_decl (decl
, 0);
4232 if (DECL_SIZE (decl
) == 0
4233 /* Don't give an error if we already gave one earlier. */
4234 && TREE_TYPE (decl
) != error_mark_node
4235 && (TREE_STATIC (decl
)
4236 /* A static variable with an incomplete type
4237 is an error if it is initialized.
4238 Also if it is not file scope.
4239 Otherwise, let it through, but if it is not `extern'
4240 then it may cause an error message later. */
4241 ? (DECL_INITIAL (decl
) != 0
4242 || !DECL_FILE_SCOPE_P (decl
))
4243 /* An automatic variable with an incomplete type
4245 : !DECL_EXTERNAL (decl
)))
4247 error ("storage size of %q+D isn%'t known", decl
);
4248 TREE_TYPE (decl
) = error_mark_node
;
4251 if ((DECL_EXTERNAL (decl
) || TREE_STATIC (decl
))
4252 && DECL_SIZE (decl
) != 0)
4254 if (TREE_CODE (DECL_SIZE (decl
)) == INTEGER_CST
)
4255 constant_expression_warning (DECL_SIZE (decl
));
4258 error ("storage size of %q+D isn%'t constant", decl
);
4259 TREE_TYPE (decl
) = error_mark_node
;
4263 if (TREE_USED (type
))
4265 TREE_USED (decl
) = 1;
4266 DECL_READ_P (decl
) = 1;
4270 /* If this is a function and an assembler name is specified, reset DECL_RTL
4271 so we can give it its new name. Also, update built_in_decls if it
4272 was a normal built-in. */
4273 if (TREE_CODE (decl
) == FUNCTION_DECL
&& asmspec
)
4275 if (DECL_BUILT_IN_CLASS (decl
) == BUILT_IN_NORMAL
)
4276 set_builtin_user_assembler_name (decl
, asmspec
);
4277 set_user_assembler_name (decl
, asmspec
);
4280 /* If #pragma weak was used, mark the decl weak now. */
4281 maybe_apply_pragma_weak (decl
);
4283 /* Output the assembler code and/or RTL code for variables and functions,
4284 unless the type is an undefined structure or union.
4285 If not, it will get done when the type is completed. */
4287 if (TREE_CODE (decl
) == VAR_DECL
|| TREE_CODE (decl
) == FUNCTION_DECL
)
4289 /* Determine the ELF visibility. */
4290 if (TREE_PUBLIC (decl
))
4291 c_determine_visibility (decl
);
4293 /* This is a no-op in c-lang.c or something real in objc-act.c. */
4294 if (c_dialect_objc ())
4295 objc_check_decl (decl
);
4299 /* If this is not a static variable, issue a warning.
4300 It doesn't make any sense to give an ASMSPEC for an
4301 ordinary, non-register local variable. Historically,
4302 GCC has accepted -- but ignored -- the ASMSPEC in
4304 if (!DECL_FILE_SCOPE_P (decl
)
4305 && TREE_CODE (decl
) == VAR_DECL
4306 && !C_DECL_REGISTER (decl
)
4307 && !TREE_STATIC (decl
))
4308 warning (0, "ignoring asm-specifier for non-static local "
4309 "variable %q+D", decl
);
4311 set_user_assembler_name (decl
, asmspec
);
4314 if (DECL_FILE_SCOPE_P (decl
))
4316 if (DECL_INITIAL (decl
) == NULL_TREE
4317 || DECL_INITIAL (decl
) == error_mark_node
)
4318 /* Don't output anything
4319 when a tentative file-scope definition is seen.
4320 But at end of compilation, do output code for them. */
4321 DECL_DEFER_OUTPUT (decl
) = 1;
4322 rest_of_decl_compilation (decl
, true, 0);
4326 /* In conjunction with an ASMSPEC, the `register'
4327 keyword indicates that we should place the variable
4328 in a particular register. */
4329 if (asmspec
&& C_DECL_REGISTER (decl
))
4331 DECL_HARD_REGISTER (decl
) = 1;
4332 /* This cannot be done for a structure with volatile
4333 fields, on which DECL_REGISTER will have been
4335 if (!DECL_REGISTER (decl
))
4336 error ("cannot put object with volatile field into register");
4339 if (TREE_CODE (decl
) != FUNCTION_DECL
)
4341 /* If we're building a variable sized type, and we might be
4342 reachable other than via the top of the current binding
4343 level, then create a new BIND_EXPR so that we deallocate
4344 the object at the right time. */
4345 /* Note that DECL_SIZE can be null due to errors. */
4346 if (DECL_SIZE (decl
)
4347 && !TREE_CONSTANT (DECL_SIZE (decl
))
4348 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list
))
4351 bind
= build3 (BIND_EXPR
, void_type_node
, NULL
, NULL
, NULL
);
4352 TREE_SIDE_EFFECTS (bind
) = 1;
4354 BIND_EXPR_BODY (bind
) = push_stmt_list ();
4356 add_stmt (build_stmt (DECL_SOURCE_LOCATION (decl
),
4362 if (!DECL_FILE_SCOPE_P (decl
))
4364 /* Recompute the RTL of a local array now
4365 if it used to be an incomplete type. */
4367 && !TREE_STATIC (decl
) && !DECL_EXTERNAL (decl
))
4369 /* If we used it already as memory, it must stay in memory. */
4370 TREE_ADDRESSABLE (decl
) = TREE_USED (decl
);
4371 /* If it's still incomplete now, no init will save it. */
4372 if (DECL_SIZE (decl
) == 0)
4373 DECL_INITIAL (decl
) = 0;
4378 if (TREE_CODE (decl
) == TYPE_DECL
)
4380 if (!DECL_FILE_SCOPE_P (decl
)
4381 && variably_modified_type_p (TREE_TYPE (decl
), NULL_TREE
))
4382 add_stmt (build_stmt (DECL_SOURCE_LOCATION (decl
), DECL_EXPR
, decl
));
4384 rest_of_decl_compilation (decl
, DECL_FILE_SCOPE_P (decl
), 0);
4387 /* At the end of a declaration, throw away any variable type sizes
4388 of types defined inside that declaration. There is no use
4389 computing them in the following function definition. */
4390 if (current_scope
== file_scope
)
4391 get_pending_sizes ();
4393 /* Install a cleanup (aka destructor) if one was given. */
4394 if (TREE_CODE (decl
) == VAR_DECL
&& !TREE_STATIC (decl
))
4396 tree attr
= lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl
));
4399 tree cleanup_id
= TREE_VALUE (TREE_VALUE (attr
));
4400 tree cleanup_decl
= lookup_name (cleanup_id
);
4404 /* Build "cleanup(&decl)" for the destructor. */
4405 cleanup
= build_unary_op (input_location
, ADDR_EXPR
, decl
, 0);
4406 vec
= VEC_alloc (tree
, gc
, 1);
4407 VEC_quick_push (tree
, vec
, cleanup
);
4408 cleanup
= build_function_call_vec (DECL_SOURCE_LOCATION (decl
),
4409 cleanup_decl
, vec
, NULL
);
4410 VEC_free (tree
, gc
, vec
);
4412 /* Don't warn about decl unused; the cleanup uses it. */
4413 TREE_USED (decl
) = 1;
4414 TREE_USED (cleanup_decl
) = 1;
4415 DECL_READ_P (decl
) = 1;
4417 push_cleanup (decl
, cleanup
, false);
4422 && TREE_CODE (decl
) == VAR_DECL
4423 && TREE_READONLY (decl
)
4424 && !DECL_EXTERNAL (decl
)
4425 && DECL_INITIAL (decl
) == NULL_TREE
)
4426 warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wc___compat
,
4427 "uninitialized const %qD is invalid in C++", decl
);
4430 /* Given a parsed parameter declaration, decode it into a PARM_DECL. */
4433 grokparm (const struct c_parm
*parm
)
4435 tree attrs
= parm
->attrs
;
4436 tree decl
= grokdeclarator (parm
->declarator
, parm
->specs
, PARM
, false,
4437 NULL
, &attrs
, NULL
, NULL
, DEPRECATED_NORMAL
);
4439 decl_attributes (&decl
, attrs
, 0);
4444 /* Given a parsed parameter declaration, decode it into a PARM_DECL
4445 and push that on the current scope. */
4448 push_parm_decl (const struct c_parm
*parm
)
4450 tree attrs
= parm
->attrs
;
4453 decl
= grokdeclarator (parm
->declarator
, parm
->specs
, PARM
, false, NULL
,
4454 &attrs
, NULL
, NULL
, DEPRECATED_NORMAL
);
4455 decl_attributes (&decl
, attrs
, 0);
4457 decl
= pushdecl (decl
);
4459 finish_decl (decl
, input_location
, NULL_TREE
, NULL_TREE
, NULL_TREE
);
4462 /* Mark all the parameter declarations to date as forward decls.
4463 Also diagnose use of this extension. */
4466 mark_forward_parm_decls (void)
4468 struct c_binding
*b
;
4470 if (pedantic
&& !current_scope
->warned_forward_parm_decls
)
4472 pedwarn (input_location
, OPT_pedantic
,
4473 "ISO C forbids forward parameter declarations");
4474 current_scope
->warned_forward_parm_decls
= true;
4477 for (b
= current_scope
->bindings
; b
; b
= b
->prev
)
4478 if (TREE_CODE (b
->decl
) == PARM_DECL
)
4479 TREE_ASM_WRITTEN (b
->decl
) = 1;
4482 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
4483 literal, which may be an incomplete array type completed by the
4484 initializer; INIT is a CONSTRUCTOR at LOC that initializes the compound
4485 literal. NON_CONST is true if the initializers contain something
4486 that cannot occur in a constant expression. */
4489 build_compound_literal (location_t loc
, tree type
, tree init
, bool non_const
)
4491 /* We do not use start_decl here because we have a type, not a declarator;
4492 and do not use finish_decl because the decl should be stored inside
4493 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_EXPR. */
4498 if (type
== error_mark_node
4499 || init
== error_mark_node
)
4500 return error_mark_node
;
4502 decl
= build_decl (loc
, VAR_DECL
, NULL_TREE
, type
);
4503 DECL_EXTERNAL (decl
) = 0;
4504 TREE_PUBLIC (decl
) = 0;
4505 TREE_STATIC (decl
) = (current_scope
== file_scope
);
4506 DECL_CONTEXT (decl
) = current_function_decl
;
4507 TREE_USED (decl
) = 1;
4508 DECL_READ_P (decl
) = 1;
4509 TREE_TYPE (decl
) = type
;
4510 TREE_READONLY (decl
) = TYPE_READONLY (type
);
4511 store_init_value (loc
, decl
, init
, NULL_TREE
);
4513 if (TREE_CODE (type
) == ARRAY_TYPE
&& !COMPLETE_TYPE_P (type
))
4515 int failure
= complete_array_type (&TREE_TYPE (decl
),
4516 DECL_INITIAL (decl
), true);
4517 gcc_assert (!failure
);
4519 type
= TREE_TYPE (decl
);
4520 TREE_TYPE (DECL_INITIAL (decl
)) = type
;
4523 if (type
== error_mark_node
|| !COMPLETE_TYPE_P (type
))
4524 return error_mark_node
;
4526 stmt
= build_stmt (DECL_SOURCE_LOCATION (decl
), DECL_EXPR
, decl
);
4527 complit
= build1 (COMPOUND_LITERAL_EXPR
, type
, stmt
);
4528 TREE_SIDE_EFFECTS (complit
) = 1;
4530 layout_decl (decl
, 0);
4532 if (TREE_STATIC (decl
))
4534 /* This decl needs a name for the assembler output. */
4535 set_compound_literal_name (decl
);
4536 DECL_DEFER_OUTPUT (decl
) = 1;
4537 DECL_COMDAT (decl
) = 1;
4538 DECL_ARTIFICIAL (decl
) = 1;
4539 DECL_IGNORED_P (decl
) = 1;
4541 rest_of_decl_compilation (decl
, 1, 0);
4546 complit
= build2 (C_MAYBE_CONST_EXPR
, type
, NULL
, complit
);
4547 C_MAYBE_CONST_EXPR_NON_CONST (complit
) = 1;
4553 /* Check the type of a compound literal. Here we just check that it
4554 is valid for C++. */
4557 check_compound_literal_type (location_t loc
, struct c_type_name
*type_name
)
4559 if (warn_cxx_compat
&& type_name
->specs
->tag_defined_p
)
4560 warning_at (loc
, OPT_Wc___compat
,
4561 "defining a type in a compound literal is invalid in C++");
4564 /* Determine whether TYPE is a structure with a flexible array member,
4565 or a union containing such a structure (possibly recursively). */
4568 flexible_array_type_p (tree type
)
4571 switch (TREE_CODE (type
))
4574 x
= TYPE_FIELDS (type
);
4577 while (DECL_CHAIN (x
) != NULL_TREE
)
4579 if (TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
4580 && TYPE_SIZE (TREE_TYPE (x
)) == NULL_TREE
4581 && TYPE_DOMAIN (TREE_TYPE (x
)) != NULL_TREE
4582 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x
))) == NULL_TREE
)
4586 for (x
= TYPE_FIELDS (type
); x
!= NULL_TREE
; x
= DECL_CHAIN (x
))
4588 if (flexible_array_type_p (TREE_TYPE (x
)))
4597 /* Performs sanity checks on the TYPE and WIDTH of the bit-field NAME,
4598 replacing with appropriate values if they are invalid. */
4600 check_bitfield_type_and_width (tree
*type
, tree
*width
, tree orig_name
)
4603 unsigned int max_width
;
4604 unsigned HOST_WIDE_INT w
;
4605 const char *name
= (orig_name
4606 ? identifier_to_locale (IDENTIFIER_POINTER (orig_name
))
4607 : _("<anonymous>"));
4609 /* Detect and ignore out of range field width and process valid
4611 if (!INTEGRAL_TYPE_P (TREE_TYPE (*width
)))
4613 error ("bit-field %qs width not an integer constant", name
);
4614 *width
= integer_one_node
;
4618 if (TREE_CODE (*width
) != INTEGER_CST
)
4620 *width
= c_fully_fold (*width
, false, NULL
);
4621 if (TREE_CODE (*width
) == INTEGER_CST
)
4622 pedwarn (input_location
, OPT_pedantic
,
4623 "bit-field %qs width not an integer constant expression",
4626 if (TREE_CODE (*width
) != INTEGER_CST
)
4628 error ("bit-field %qs width not an integer constant", name
);
4629 *width
= integer_one_node
;
4631 constant_expression_warning (*width
);
4632 if (tree_int_cst_sgn (*width
) < 0)
4634 error ("negative width in bit-field %qs", name
);
4635 *width
= integer_one_node
;
4637 else if (integer_zerop (*width
) && orig_name
)
4639 error ("zero width for bit-field %qs", name
);
4640 *width
= integer_one_node
;
4644 /* Detect invalid bit-field type. */
4645 if (TREE_CODE (*type
) != INTEGER_TYPE
4646 && TREE_CODE (*type
) != BOOLEAN_TYPE
4647 && TREE_CODE (*type
) != ENUMERAL_TYPE
)
4649 error ("bit-field %qs has invalid type", name
);
4650 *type
= unsigned_type_node
;
4653 type_mv
= TYPE_MAIN_VARIANT (*type
);
4654 if (!in_system_header
4655 && type_mv
!= integer_type_node
4656 && type_mv
!= unsigned_type_node
4657 && type_mv
!= boolean_type_node
)
4658 pedwarn (input_location
, OPT_pedantic
,
4659 "type of bit-field %qs is a GCC extension", name
);
4661 max_width
= TYPE_PRECISION (*type
);
4663 if (0 < compare_tree_int (*width
, max_width
))
4665 error ("width of %qs exceeds its type", name
);
4667 *width
= build_int_cst (NULL_TREE
, w
);
4670 w
= tree_low_cst (*width
, 1);
4672 if (TREE_CODE (*type
) == ENUMERAL_TYPE
)
4674 struct lang_type
*lt
= TYPE_LANG_SPECIFIC (*type
);
4676 || w
< tree_int_cst_min_precision (lt
->enum_min
, TYPE_UNSIGNED (*type
))
4677 || w
< tree_int_cst_min_precision (lt
->enum_max
, TYPE_UNSIGNED (*type
)))
4678 warning (0, "%qs is narrower than values of its type", name
);
4684 /* Print warning about variable length array if necessary. */
4687 warn_variable_length_array (tree name
, tree size
)
4689 int const_size
= TREE_CONSTANT (size
);
4691 if (!flag_isoc99
&& pedantic
&& warn_vla
!= 0)
4696 pedwarn (input_location
, OPT_Wvla
,
4697 "ISO C90 forbids array %qE whose size "
4698 "can%'t be evaluated",
4701 pedwarn (input_location
, OPT_Wvla
, "ISO C90 forbids array whose size "
4702 "can%'t be evaluated");
4707 pedwarn (input_location
, OPT_Wvla
,
4708 "ISO C90 forbids variable length array %qE",
4711 pedwarn (input_location
, OPT_Wvla
, "ISO C90 forbids variable length array");
4714 else if (warn_vla
> 0)
4720 "the size of array %qE can"
4721 "%'t be evaluated", name
);
4724 "the size of array can %'t be evaluated");
4730 "variable length array %qE is used",
4734 "variable length array is used");
4739 /* Given a size SIZE that may not be a constant, return a SAVE_EXPR to
4740 serve as the actual size-expression for a type or decl. This is
4741 like variable_size in stor-layout.c, but we make global_bindings_p
4742 return negative to avoid calls to that function from outside the
4743 front end resulting in errors at file scope, then call this version
4744 instead from front-end code. */
4747 c_variable_size (tree size
)
4751 if (TREE_CONSTANT (size
))
4754 size
= save_expr (size
);
4756 save
= skip_simple_arithmetic (size
);
4758 if (cfun
&& cfun
->dont_save_pending_sizes_p
)
4761 if (!global_bindings_p ())
4762 put_pending_size (save
);
4767 /* Given declspecs and a declarator,
4768 determine the name and type of the object declared
4769 and construct a ..._DECL node for it.
4770 (In one case we can return a ..._TYPE node instead.
4771 For invalid input we sometimes return 0.)
4773 DECLSPECS is a c_declspecs structure for the declaration specifiers.
4775 DECL_CONTEXT says which syntactic context this declaration is in:
4776 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
4777 FUNCDEF for a function definition. Like NORMAL but a few different
4778 error messages in each case. Return value may be zero meaning
4779 this definition is too screwy to try to parse.
4780 PARM for a parameter declaration (either within a function prototype
4781 or before a function body). Make a PARM_DECL, or return void_type_node.
4782 TYPENAME if for a typename (in a cast or sizeof).
4783 Don't make a DECL node; just return the ..._TYPE node.
4784 FIELD for a struct or union field; make a FIELD_DECL.
4785 INITIALIZED is true if the decl has an initializer.
4786 WIDTH is non-NULL for bit-fields, and is a pointer to an INTEGER_CST node
4787 representing the width of the bit-field.
4788 DECL_ATTRS points to the list of attributes that should be added to this
4789 decl. Any nested attributes that belong on the decl itself will be
4791 If EXPR is not NULL, any expressions that need to be evaluated as
4792 part of evaluating variably modified types will be stored in *EXPR.
4793 If EXPR_CONST_OPERANDS is not NULL, *EXPR_CONST_OPERANDS will be
4794 set to indicate whether operands in *EXPR can be used in constant
4796 DEPRECATED_STATE is a deprecated_states value indicating whether
4797 deprecation warnings should be suppressed.
4799 In the TYPENAME case, DECLARATOR is really an absolute declarator.
4800 It may also be so in the PARM case, for a prototype where the
4801 argument type is specified but not the name.
4803 This function is where the complicated C meanings of `static'
4804 and `extern' are interpreted. */
4807 grokdeclarator (const struct c_declarator
*declarator
,
4808 struct c_declspecs
*declspecs
,
4809 enum decl_context decl_context
, bool initialized
, tree
*width
,
4810 tree
*decl_attrs
, tree
*expr
, bool *expr_const_operands
,
4811 enum deprecated_states deprecated_state
)
4813 tree type
= declspecs
->type
;
4814 bool threadp
= declspecs
->thread_p
;
4815 enum c_storage_class storage_class
= declspecs
->storage_class
;
4819 int type_quals
= TYPE_UNQUALIFIED
;
4820 tree name
= NULL_TREE
;
4821 bool funcdef_flag
= false;
4822 bool funcdef_syntax
= false;
4823 bool size_varies
= false;
4824 tree decl_attr
= declspecs
->decl_attr
;
4825 int array_ptr_quals
= TYPE_UNQUALIFIED
;
4826 tree array_ptr_attrs
= NULL_TREE
;
4827 int array_parm_static
= 0;
4828 bool array_parm_vla_unspec_p
= false;
4829 tree returned_attrs
= NULL_TREE
;
4830 bool bitfield
= width
!= NULL
;
4832 struct c_arg_info
*arg_info
= 0;
4833 addr_space_t as1
, as2
, address_space
;
4834 location_t loc
= UNKNOWN_LOCATION
;
4837 bool expr_const_operands_dummy
;
4841 if (expr_const_operands
== NULL
)
4842 expr_const_operands
= &expr_const_operands_dummy
;
4844 *expr
= declspecs
->expr
;
4845 *expr_const_operands
= declspecs
->expr_const_operands
;
4847 if (decl_context
== FUNCDEF
)
4848 funcdef_flag
= true, decl_context
= NORMAL
;
4850 /* Look inside a declarator for the name being declared
4851 and get it as an IDENTIFIER_NODE, for an error message. */
4853 const struct c_declarator
*decl
= declarator
;
4864 funcdef_syntax
= (decl
->kind
== cdk_function
);
4865 decl
= decl
->declarator
;
4869 decl
= decl
->declarator
;
4884 gcc_assert (decl_context
== PARM
4885 || decl_context
== TYPENAME
4886 || (decl_context
== FIELD
4887 && declarator
->kind
== cdk_id
));
4888 gcc_assert (!initialized
);
4892 /* A function definition's declarator must have the form of
4893 a function declarator. */
4895 if (funcdef_flag
&& !funcdef_syntax
)
4898 /* If this looks like a function definition, make it one,
4899 even if it occurs where parms are expected.
4900 Then store_parm_decls will reject it and not use it as a parm. */
4901 if (decl_context
== NORMAL
&& !funcdef_flag
&& current_scope
->parm_flag
)
4902 decl_context
= PARM
;
4904 if (declspecs
->deprecated_p
&& deprecated_state
!= DEPRECATED_SUPPRESS
)
4905 warn_deprecated_use (declspecs
->type
, declspecs
->decl_attr
);
4907 if ((decl_context
== NORMAL
|| decl_context
== FIELD
)
4908 && current_scope
== file_scope
4909 && variably_modified_type_p (type
, NULL_TREE
))
4912 error_at (loc
, "variably modified %qE at file scope", name
);
4914 error_at (loc
, "variably modified field at file scope");
4915 type
= integer_type_node
;
4918 size_varies
= C_TYPE_VARIABLE_SIZE (type
) != 0;
4920 /* Diagnose defaulting to "int". */
4922 if (declspecs
->default_int_p
&& !in_system_header
)
4924 /* Issue a warning if this is an ISO C 99 program or if
4925 -Wreturn-type and this is a function, or if -Wimplicit;
4926 prefer the former warning since it is more explicit. */
4927 if ((warn_implicit_int
|| warn_return_type
|| flag_isoc99
)
4929 warn_about_return_type
= 1;
4933 pedwarn_c99 (loc
, flag_isoc99
? 0 : OPT_Wimplicit_int
,
4934 "type defaults to %<int%> in declaration of %qE",
4937 pedwarn_c99 (input_location
, flag_isoc99
? 0 : OPT_Wimplicit_int
,
4938 "type defaults to %<int%> in type name");
4942 /* Adjust the type if a bit-field is being declared,
4943 -funsigned-bitfields applied and the type is not explicitly
4945 if (bitfield
&& !flag_signed_bitfields
&& !declspecs
->explicit_signed_p
4946 && TREE_CODE (type
) == INTEGER_TYPE
)
4947 type
= unsigned_type_for (type
);
4949 /* Figure out the type qualifiers for the declaration. There are
4950 two ways a declaration can become qualified. One is something
4951 like `const int i' where the `const' is explicit. Another is
4952 something like `typedef const int CI; CI i' where the type of the
4953 declaration contains the `const'. A third possibility is that
4954 there is a type qualifier on the element type of a typedefed
4955 array type, in which case we should extract that qualifier so
4956 that c_apply_type_quals_to_decl receives the full list of
4957 qualifiers to work with (C90 is not entirely clear about whether
4958 duplicate qualifiers should be diagnosed in this case, but it
4959 seems most appropriate to do so). */
4960 element_type
= strip_array_types (type
);
4961 constp
= declspecs
->const_p
+ TYPE_READONLY (element_type
);
4962 restrictp
= declspecs
->restrict_p
+ TYPE_RESTRICT (element_type
);
4963 volatilep
= declspecs
->volatile_p
+ TYPE_VOLATILE (element_type
);
4964 as1
= declspecs
->address_space
;
4965 as2
= TYPE_ADDR_SPACE (element_type
);
4966 address_space
= ADDR_SPACE_GENERIC_P (as1
)? as2
: as1
;
4968 if (pedantic
&& !flag_isoc99
)
4971 pedwarn (loc
, OPT_pedantic
, "duplicate %<const%>");
4973 pedwarn (loc
, OPT_pedantic
, "duplicate %<restrict%>");
4975 pedwarn (loc
, OPT_pedantic
, "duplicate %<volatile%>");
4978 if (!ADDR_SPACE_GENERIC_P (as1
) && !ADDR_SPACE_GENERIC_P (as2
) && as1
!= as2
)
4979 error_at (loc
, "conflicting named address spaces (%s vs %s)",
4980 c_addr_space_name (as1
), c_addr_space_name (as2
));
4982 if (!flag_gen_aux_info
&& (TYPE_QUALS (element_type
)))
4983 type
= TYPE_MAIN_VARIANT (type
);
4984 type_quals
= ((constp
? TYPE_QUAL_CONST
: 0)
4985 | (restrictp
? TYPE_QUAL_RESTRICT
: 0)
4986 | (volatilep
? TYPE_QUAL_VOLATILE
: 0)
4987 | ENCODE_QUAL_ADDR_SPACE (address_space
));
4989 /* Warn about storage classes that are invalid for certain
4990 kinds of declarations (parameters, typenames, etc.). */
4994 || storage_class
== csc_auto
4995 || storage_class
== csc_register
4996 || storage_class
== csc_typedef
))
4998 if (storage_class
== csc_auto
)
5000 (current_scope
== file_scope
) ? 0 : OPT_pedantic
,
5001 "function definition declared %<auto%>");
5002 if (storage_class
== csc_register
)
5003 error_at (loc
, "function definition declared %<register%>");
5004 if (storage_class
== csc_typedef
)
5005 error_at (loc
, "function definition declared %<typedef%>");
5007 error_at (loc
, "function definition declared %<__thread%>");
5009 if (storage_class
== csc_auto
5010 || storage_class
== csc_register
5011 || storage_class
== csc_typedef
)
5012 storage_class
= csc_none
;
5014 else if (decl_context
!= NORMAL
&& (storage_class
!= csc_none
|| threadp
))
5016 if (decl_context
== PARM
&& storage_class
== csc_register
)
5020 switch (decl_context
)
5024 error_at (loc
, "storage class specified for structure "
5027 error_at (loc
, "storage class specified for structure field");
5031 error_at (loc
, "storage class specified for parameter %qE",
5034 error_at (loc
, "storage class specified for unnamed parameter");
5037 error_at (loc
, "storage class specified for typename");
5040 storage_class
= csc_none
;
5044 else if (storage_class
== csc_extern
5048 /* 'extern' with initialization is invalid if not at file scope. */
5049 if (current_scope
== file_scope
)
5051 /* It is fine to have 'extern const' when compiling at C
5052 and C++ intersection. */
5053 if (!(warn_cxx_compat
&& constp
))
5054 warning_at (loc
, 0, "%qE initialized and declared %<extern%>",
5058 error_at (loc
, "%qE has both %<extern%> and initializer", name
);
5060 else if (current_scope
== file_scope
)
5062 if (storage_class
== csc_auto
)
5063 error_at (loc
, "file-scope declaration of %qE specifies %<auto%>",
5065 if (pedantic
&& storage_class
== csc_register
)
5066 pedwarn (input_location
, OPT_pedantic
,
5067 "file-scope declaration of %qE specifies %<register%>", name
);
5071 if (storage_class
== csc_extern
&& funcdef_flag
)
5072 error_at (loc
, "nested function %qE declared %<extern%>", name
);
5073 else if (threadp
&& storage_class
== csc_none
)
5075 error_at (loc
, "function-scope %qE implicitly auto and declared "
5082 /* Now figure out the structure of the declarator proper.
5083 Descend through it, creating more complex types, until we reach
5084 the declared identifier (or NULL_TREE, in an absolute declarator).
5085 At each stage we maintain an unqualified version of the type
5086 together with any qualifiers that should be applied to it with
5087 c_build_qualified_type; this way, array types including
5088 multidimensional array types are first built up in unqualified
5089 form and then the qualified form is created with
5090 TYPE_MAIN_VARIANT pointing to the unqualified form. */
5092 while (declarator
&& declarator
->kind
!= cdk_id
)
5094 if (type
== error_mark_node
)
5096 declarator
= declarator
->declarator
;
5100 /* Each level of DECLARATOR is either a cdk_array (for ...[..]),
5101 a cdk_pointer (for *...),
5102 a cdk_function (for ...(...)),
5103 a cdk_attrs (for nested attributes),
5104 or a cdk_id (for the name being declared
5105 or the place in an absolute declarator
5106 where the name was omitted).
5107 For the last case, we have just exited the loop.
5109 At this point, TYPE is the type of elements of an array,
5110 or for a function to return, or for a pointer to point to.
5111 After this sequence of ifs, TYPE is the type of the
5112 array or function or pointer, and DECLARATOR has had its
5113 outermost layer removed. */
5115 if (array_ptr_quals
!= TYPE_UNQUALIFIED
5116 || array_ptr_attrs
!= NULL_TREE
5117 || array_parm_static
)
5119 /* Only the innermost declarator (making a parameter be of
5120 array type which is converted to pointer type)
5121 may have static or type qualifiers. */
5122 error_at (loc
, "static or type qualifiers in non-parameter array declarator");
5123 array_ptr_quals
= TYPE_UNQUALIFIED
;
5124 array_ptr_attrs
= NULL_TREE
;
5125 array_parm_static
= 0;
5128 switch (declarator
->kind
)
5132 /* A declarator with embedded attributes. */
5133 tree attrs
= declarator
->u
.attrs
;
5134 const struct c_declarator
*inner_decl
;
5136 declarator
= declarator
->declarator
;
5137 inner_decl
= declarator
;
5138 while (inner_decl
->kind
== cdk_attrs
)
5139 inner_decl
= inner_decl
->declarator
;
5140 if (inner_decl
->kind
== cdk_id
)
5141 attr_flags
|= (int) ATTR_FLAG_DECL_NEXT
;
5142 else if (inner_decl
->kind
== cdk_function
)
5143 attr_flags
|= (int) ATTR_FLAG_FUNCTION_NEXT
;
5144 else if (inner_decl
->kind
== cdk_array
)
5145 attr_flags
|= (int) ATTR_FLAG_ARRAY_NEXT
;
5146 returned_attrs
= decl_attributes (&type
,
5147 chainon (returned_attrs
, attrs
),
5153 tree itype
= NULL_TREE
;
5154 tree size
= declarator
->u
.array
.dimen
;
5155 /* The index is a signed object `sizetype' bits wide. */
5156 tree index_type
= c_common_signed_type (sizetype
);
5158 array_ptr_quals
= declarator
->u
.array
.quals
;
5159 array_ptr_attrs
= declarator
->u
.array
.attrs
;
5160 array_parm_static
= declarator
->u
.array
.static_p
;
5161 array_parm_vla_unspec_p
= declarator
->u
.array
.vla_unspec_p
;
5163 declarator
= declarator
->declarator
;
5165 /* Check for some types that there cannot be arrays of. */
5167 if (VOID_TYPE_P (type
))
5170 error_at (loc
, "declaration of %qE as array of voids", name
);
5172 error_at (loc
, "declaration of type name as array of voids");
5173 type
= error_mark_node
;
5176 if (TREE_CODE (type
) == FUNCTION_TYPE
)
5179 error_at (loc
, "declaration of %qE as array of functions",
5182 error_at (loc
, "declaration of type name as array of "
5184 type
= error_mark_node
;
5187 if (pedantic
&& !in_system_header
&& flexible_array_type_p (type
))
5188 pedwarn (loc
, OPT_pedantic
,
5189 "invalid use of structure with flexible array member");
5191 if (size
== error_mark_node
)
5192 type
= error_mark_node
;
5194 if (type
== error_mark_node
)
5197 /* If size was specified, set ITYPE to a range-type for
5198 that size. Otherwise, ITYPE remains null. finish_decl
5199 may figure it out from an initial value. */
5203 bool size_maybe_const
= true;
5204 bool size_int_const
= (TREE_CODE (size
) == INTEGER_CST
5205 && !TREE_OVERFLOW (size
));
5206 bool this_size_varies
= false;
5208 /* Strip NON_LVALUE_EXPRs since we aren't using as an
5210 STRIP_TYPE_NOPS (size
);
5212 if (!INTEGRAL_TYPE_P (TREE_TYPE (size
)))
5215 error_at (loc
, "size of array %qE has non-integer type",
5219 "size of unnamed array has non-integer type");
5220 size
= integer_one_node
;
5223 size
= c_fully_fold (size
, false, &size_maybe_const
);
5225 if (pedantic
&& size_maybe_const
&& integer_zerop (size
))
5228 pedwarn (loc
, OPT_pedantic
,
5229 "ISO C forbids zero-size array %qE", name
);
5231 pedwarn (loc
, OPT_pedantic
,
5232 "ISO C forbids zero-size array");
5235 if (TREE_CODE (size
) == INTEGER_CST
&& size_maybe_const
)
5237 constant_expression_warning (size
);
5238 if (tree_int_cst_sgn (size
) < 0)
5241 error_at (loc
, "size of array %qE is negative", name
);
5243 error_at (loc
, "size of unnamed array is negative");
5244 size
= integer_one_node
;
5246 /* Handle a size folded to an integer constant but
5247 not an integer constant expression. */
5248 if (!size_int_const
)
5250 /* If this is a file scope declaration of an
5251 ordinary identifier, this is invalid code;
5252 diagnosing it here and not subsequently
5253 treating the type as variable-length avoids
5254 more confusing diagnostics later. */
5255 if ((decl_context
== NORMAL
|| decl_context
== FIELD
)
5256 && current_scope
== file_scope
)
5257 pedwarn (input_location
, 0,
5258 "variably modified %qE at file scope",
5261 this_size_varies
= size_varies
= true;
5262 warn_variable_length_array (name
, size
);
5265 else if ((decl_context
== NORMAL
|| decl_context
== FIELD
)
5266 && current_scope
== file_scope
)
5268 error_at (loc
, "variably modified %qE at file scope", name
);
5269 size
= integer_one_node
;
5273 /* Make sure the array size remains visibly
5274 nonconstant even if it is (eg) a const variable
5275 with known value. */
5276 this_size_varies
= size_varies
= true;
5277 warn_variable_length_array (name
, size
);
5280 if (integer_zerop (size
) && !this_size_varies
)
5282 /* A zero-length array cannot be represented with
5283 an unsigned index type, which is what we'll
5284 get with build_index_type. Create an
5285 open-ended range instead. */
5286 itype
= build_range_type (sizetype
, size
, NULL_TREE
);
5290 /* Arrange for the SAVE_EXPR on the inside of the
5291 MINUS_EXPR, which allows the -1 to get folded
5292 with the +1 that happens when building TYPE_SIZE. */
5294 size
= c_variable_size (size
);
5295 if (this_size_varies
&& TREE_CODE (size
) == INTEGER_CST
)
5296 size
= build2 (COMPOUND_EXPR
, TREE_TYPE (size
),
5297 integer_zero_node
, size
);
5299 /* Compute the maximum valid index, that is, size
5300 - 1. Do the calculation in index_type, so that
5301 if it is a variable the computations will be
5302 done in the proper mode. */
5303 itype
= fold_build2_loc (loc
, MINUS_EXPR
, index_type
,
5304 convert (index_type
, size
),
5305 convert (index_type
,
5308 /* If that overflowed, the array is too big. ???
5309 While a size of INT_MAX+1 technically shouldn't
5310 cause an overflow (because we subtract 1), the
5311 overflow is recorded during the conversion to
5312 index_type, before the subtraction. Handling
5313 this case seems like an unnecessary
5315 if (TREE_CODE (itype
) == INTEGER_CST
5316 && TREE_OVERFLOW (itype
))
5319 error_at (loc
, "size of array %qE is too large",
5322 error_at (loc
, "size of unnamed array is too large");
5323 type
= error_mark_node
;
5327 itype
= build_index_type (itype
);
5329 if (this_size_varies
)
5332 *expr
= build2 (COMPOUND_EXPR
, TREE_TYPE (size
),
5336 *expr_const_operands
&= size_maybe_const
;
5339 else if (decl_context
== FIELD
)
5341 bool flexible_array_member
= false;
5342 if (array_parm_vla_unspec_p
)
5343 /* Field names can in fact have function prototype
5344 scope so [*] is disallowed here through making
5345 the field variably modified, not through being
5346 something other than a declaration with function
5351 const struct c_declarator
*t
= declarator
;
5352 while (t
->kind
== cdk_attrs
)
5354 flexible_array_member
= (t
->kind
== cdk_id
);
5356 if (flexible_array_member
5357 && pedantic
&& !flag_isoc99
&& !in_system_header
)
5358 pedwarn (loc
, OPT_pedantic
,
5359 "ISO C90 does not support flexible array members");
5361 /* ISO C99 Flexible array members are effectively
5362 identical to GCC's zero-length array extension. */
5363 if (flexible_array_member
|| array_parm_vla_unspec_p
)
5364 itype
= build_range_type (sizetype
, size_zero_node
,
5367 else if (decl_context
== PARM
)
5369 if (array_parm_vla_unspec_p
)
5371 itype
= build_range_type (sizetype
, size_zero_node
, NULL_TREE
);
5375 else if (decl_context
== TYPENAME
)
5377 if (array_parm_vla_unspec_p
)
5380 warning (0, "%<[*]%> not in a declaration");
5381 /* We use this to avoid messing up with incomplete
5382 array types of the same type, that would
5383 otherwise be modified below. */
5384 itype
= build_range_type (sizetype
, size_zero_node
,
5390 /* Complain about arrays of incomplete types. */
5391 if (!COMPLETE_TYPE_P (type
))
5393 error_at (loc
, "array type has incomplete element type");
5394 type
= error_mark_node
;
5397 /* When itype is NULL, a shared incomplete array type is
5398 returned for all array of a given type. Elsewhere we
5399 make sure we don't complete that type before copying
5400 it, but here we want to make sure we don't ever
5401 modify the shared type, so we gcc_assert (itype)
5404 addr_space_t as
= DECODE_QUAL_ADDR_SPACE (type_quals
);
5405 if (!ADDR_SPACE_GENERIC_P (as
) && as
!= TYPE_ADDR_SPACE (type
))
5406 type
= build_qualified_type (type
,
5407 ENCODE_QUAL_ADDR_SPACE (as
));
5409 type
= build_array_type (type
, itype
);
5412 if (type
!= error_mark_node
)
5416 /* It is ok to modify type here even if itype is
5417 NULL: if size_varies, we're in a
5418 multi-dimensional array and the inner type has
5419 variable size, so the enclosing shared array type
5421 if (size
&& TREE_CODE (size
) == INTEGER_CST
)
5423 = build_distinct_type_copy (TYPE_MAIN_VARIANT (type
));
5424 C_TYPE_VARIABLE_SIZE (type
) = 1;
5427 /* The GCC extension for zero-length arrays differs from
5428 ISO flexible array members in that sizeof yields
5430 if (size
&& integer_zerop (size
))
5433 TYPE_SIZE (type
) = bitsize_zero_node
;
5434 TYPE_SIZE_UNIT (type
) = size_zero_node
;
5435 SET_TYPE_STRUCTURAL_EQUALITY (type
);
5437 if (array_parm_vla_unspec_p
)
5440 /* The type is complete. C99 6.7.5.2p4 */
5441 TYPE_SIZE (type
) = bitsize_zero_node
;
5442 TYPE_SIZE_UNIT (type
) = size_zero_node
;
5443 SET_TYPE_STRUCTURAL_EQUALITY (type
);
5447 if (decl_context
!= PARM
5448 && (array_ptr_quals
!= TYPE_UNQUALIFIED
5449 || array_ptr_attrs
!= NULL_TREE
5450 || array_parm_static
))
5452 error_at (loc
, "static or type qualifiers in non-parameter array declarator");
5453 array_ptr_quals
= TYPE_UNQUALIFIED
;
5454 array_ptr_attrs
= NULL_TREE
;
5455 array_parm_static
= 0;
5461 /* Say it's a definition only for the declarator closest
5462 to the identifier, apart possibly from some
5464 bool really_funcdef
= false;
5468 const struct c_declarator
*t
= declarator
->declarator
;
5469 while (t
->kind
== cdk_attrs
)
5471 really_funcdef
= (t
->kind
== cdk_id
);
5474 /* Declaring a function type. Make sure we have a valid
5475 type for the function to return. */
5476 if (type
== error_mark_node
)
5479 size_varies
= false;
5481 /* Warn about some types functions can't return. */
5482 if (TREE_CODE (type
) == FUNCTION_TYPE
)
5485 error_at (loc
, "%qE declared as function returning a "
5488 error_at (loc
, "type name declared as function "
5489 "returning a function");
5490 type
= integer_type_node
;
5492 if (TREE_CODE (type
) == ARRAY_TYPE
)
5495 error_at (loc
, "%qE declared as function returning an array",
5498 error_at (loc
, "type name declared as function returning "
5500 type
= integer_type_node
;
5502 errmsg
= targetm
.invalid_return_type (type
);
5506 type
= integer_type_node
;
5509 /* Construct the function type and go to the next
5510 inner layer of declarator. */
5511 arg_info
= declarator
->u
.arg_info
;
5512 arg_types
= grokparms (arg_info
, really_funcdef
);
5514 put_pending_sizes (arg_info
->pending_sizes
);
5516 /* Type qualifiers before the return type of the function
5517 qualify the return type, not the function type. */
5520 /* Type qualifiers on a function return type are
5521 normally permitted by the standard but have no
5522 effect, so give a warning at -Wreturn-type.
5523 Qualifiers on a void return type are banned on
5524 function definitions in ISO C; GCC used to used
5525 them for noreturn functions. */
5526 if (VOID_TYPE_P (type
) && really_funcdef
)
5528 "function definition has qualified void return type");
5530 warning_at (loc
, OPT_Wignored_qualifiers
,
5531 "type qualifiers ignored on function return type");
5533 type
= c_build_qualified_type (type
, type_quals
);
5535 type_quals
= TYPE_UNQUALIFIED
;
5537 type
= build_function_type (type
, arg_types
);
5538 declarator
= declarator
->declarator
;
5540 /* Set the TYPE_CONTEXTs for each tagged type which is local to
5541 the formal parameter list of this FUNCTION_TYPE to point to
5542 the FUNCTION_TYPE node itself. */
5547 FOR_EACH_VEC_ELT_REVERSE (c_arg_tag
, arg_info
->tags
, ix
, tag
)
5548 TYPE_CONTEXT (tag
->type
) = type
;
5554 /* Merge any constancy or volatility into the target type
5557 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
5559 pedwarn (loc
, OPT_pedantic
,
5560 "ISO C forbids qualified function types");
5562 type
= c_build_qualified_type (type
, type_quals
);
5563 size_varies
= false;
5565 /* When the pointed-to type involves components of variable size,
5566 care must be taken to ensure that the size evaluation code is
5567 emitted early enough to dominate all the possible later uses
5568 and late enough for the variables on which it depends to have
5571 This is expected to happen automatically when the pointed-to
5572 type has a name/declaration of it's own, but special attention
5573 is required if the type is anonymous.
5575 We handle the NORMAL and FIELD contexts here by attaching an
5576 artificial TYPE_DECL to such pointed-to type. This forces the
5577 sizes evaluation at a safe point and ensures it is not deferred
5578 until e.g. within a deeper conditional context.
5580 We expect nothing to be needed here for PARM or TYPENAME.
5581 Pushing a TYPE_DECL at this point for TYPENAME would actually
5582 be incorrect, as we might be in the middle of an expression
5583 with side effects on the pointed-to type size "arguments" prior
5584 to the pointer declaration point and the fake TYPE_DECL in the
5585 enclosing context would force the size evaluation prior to the
5588 if (!TYPE_NAME (type
)
5589 && (decl_context
== NORMAL
|| decl_context
== FIELD
)
5590 && variably_modified_type_p (type
, NULL_TREE
))
5592 tree decl
= build_decl (loc
, TYPE_DECL
, NULL_TREE
, type
);
5593 DECL_ARTIFICIAL (decl
) = 1;
5595 finish_decl (decl
, loc
, NULL_TREE
, NULL_TREE
, NULL_TREE
);
5596 TYPE_NAME (type
) = decl
;
5599 type
= build_pointer_type (type
);
5601 /* Process type qualifiers (such as const or volatile)
5602 that were given inside the `*'. */
5603 type_quals
= declarator
->u
.pointer_quals
;
5605 declarator
= declarator
->declarator
;
5612 *decl_attrs
= chainon (returned_attrs
, *decl_attrs
);
5614 /* Now TYPE has the actual type, apart from any qualifiers in
5617 /* Warn about address space used for things other than static memory or
5619 address_space
= DECODE_QUAL_ADDR_SPACE (type_quals
);
5620 if (!ADDR_SPACE_GENERIC_P (address_space
))
5622 if (decl_context
== NORMAL
)
5624 switch (storage_class
)
5627 error ("%qs combined with %<auto%> qualifier for %qE",
5628 c_addr_space_name (address_space
), name
);
5631 error ("%qs combined with %<register%> qualifier for %qE",
5632 c_addr_space_name (address_space
), name
);
5635 if (current_function_scope
)
5637 error ("%qs specified for auto variable %qE",
5638 c_addr_space_name (address_space
), name
);
5650 else if (decl_context
== PARM
&& TREE_CODE (type
) != ARRAY_TYPE
)
5653 error ("%qs specified for parameter %qE",
5654 c_addr_space_name (address_space
), name
);
5656 error ("%qs specified for unnamed parameter",
5657 c_addr_space_name (address_space
));
5659 else if (decl_context
== FIELD
)
5662 error ("%qs specified for structure field %qE",
5663 c_addr_space_name (address_space
), name
);
5665 error ("%qs specified for structure field",
5666 c_addr_space_name (address_space
));
5670 /* Check the type and width of a bit-field. */
5672 check_bitfield_type_and_width (&type
, width
, name
);
5674 /* Did array size calculations overflow? */
5676 if (TREE_CODE (type
) == ARRAY_TYPE
5677 && COMPLETE_TYPE_P (type
)
5678 && TREE_CODE (TYPE_SIZE_UNIT (type
)) == INTEGER_CST
5679 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type
)))
5682 error_at (loc
, "size of array %qE is too large", name
);
5684 error_at (loc
, "size of unnamed array is too large");
5685 /* If we proceed with the array type as it is, we'll eventually
5686 crash in tree_low_cst(). */
5687 type
= error_mark_node
;
5690 /* If this is declaring a typedef name, return a TYPE_DECL. */
5692 if (storage_class
== csc_typedef
)
5695 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
5697 pedwarn (loc
, OPT_pedantic
,
5698 "ISO C forbids qualified function types");
5700 type
= c_build_qualified_type (type
, type_quals
);
5701 decl
= build_decl (declarator
->id_loc
,
5702 TYPE_DECL
, declarator
->u
.id
, type
);
5703 if (declspecs
->explicit_signed_p
)
5704 C_TYPEDEF_EXPLICITLY_SIGNED (decl
) = 1;
5705 if (declspecs
->inline_p
)
5706 pedwarn (loc
, 0,"typedef %q+D declared %<inline%>", decl
);
5708 if (warn_cxx_compat
&& declarator
->u
.id
!= NULL_TREE
)
5710 struct c_binding
*b
= I_TAG_BINDING (declarator
->u
.id
);
5713 && b
->decl
!= NULL_TREE
5714 && (B_IN_CURRENT_SCOPE (b
)
5715 || (current_scope
== file_scope
&& B_IN_EXTERNAL_SCOPE (b
)))
5716 && TYPE_MAIN_VARIANT (b
->decl
) != TYPE_MAIN_VARIANT (type
))
5718 warning_at (declarator
->id_loc
, OPT_Wc___compat
,
5719 ("using %qD as both a typedef and a tag is "
5722 if (b
->locus
!= UNKNOWN_LOCATION
)
5723 inform (b
->locus
, "originally defined here");
5730 /* If this is a type name (such as, in a cast or sizeof),
5731 compute the type and return it now. */
5733 if (decl_context
== TYPENAME
)
5735 /* Note that the grammar rejects storage classes in typenames
5737 gcc_assert (storage_class
== csc_none
&& !threadp
5738 && !declspecs
->inline_p
);
5739 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
5741 pedwarn (loc
, OPT_pedantic
,
5742 "ISO C forbids const or volatile function types");
5744 type
= c_build_qualified_type (type
, type_quals
);
5748 if (pedantic
&& decl_context
== FIELD
5749 && variably_modified_type_p (type
, NULL_TREE
))
5752 pedwarn (loc
, OPT_pedantic
, "a member of a structure or union cannot "
5753 "have a variably modified type");
5756 /* Aside from typedefs and type names (handle above),
5757 `void' at top level (not within pointer)
5758 is allowed only in public variables.
5759 We don't complain about parms either, but that is because
5760 a better error message can be made later. */
5762 if (VOID_TYPE_P (type
) && decl_context
!= PARM
5763 && !((decl_context
!= FIELD
&& TREE_CODE (type
) != FUNCTION_TYPE
)
5764 && (storage_class
== csc_extern
5765 || (current_scope
== file_scope
5766 && !(storage_class
== csc_static
5767 || storage_class
== csc_register
)))))
5769 error_at (loc
, "variable or field %qE declared void", name
);
5770 type
= integer_type_node
;
5773 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
5774 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
5779 if (decl_context
== PARM
)
5783 /* A parameter declared as an array of T is really a pointer to T.
5784 One declared as a function is really a pointer to a function. */
5786 if (TREE_CODE (type
) == ARRAY_TYPE
)
5788 /* Transfer const-ness of array into that of type pointed to. */
5789 type
= TREE_TYPE (type
);
5791 type
= c_build_qualified_type (type
, type_quals
);
5792 type
= build_pointer_type (type
);
5793 type_quals
= array_ptr_quals
;
5795 type
= c_build_qualified_type (type
, type_quals
);
5797 /* We don't yet implement attributes in this context. */
5798 if (array_ptr_attrs
!= NULL_TREE
)
5799 warning_at (loc
, OPT_Wattributes
,
5800 "attributes in parameter array declarator ignored");
5802 size_varies
= false;
5804 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
5807 pedwarn (loc
, OPT_pedantic
,
5808 "ISO C forbids qualified function types");
5810 type
= c_build_qualified_type (type
, type_quals
);
5811 type
= build_pointer_type (type
);
5812 type_quals
= TYPE_UNQUALIFIED
;
5814 else if (type_quals
)
5815 type
= c_build_qualified_type (type
, type_quals
);
5817 decl
= build_decl (declarator
->id_loc
,
5818 PARM_DECL
, declarator
->u
.id
, type
);
5820 C_DECL_VARIABLE_SIZE (decl
) = 1;
5822 /* Compute the type actually passed in the parmlist,
5823 for the case where there is no prototype.
5824 (For example, shorts and chars are passed as ints.)
5825 When there is a prototype, this is overridden later. */
5827 if (type
== error_mark_node
)
5828 promoted_type
= type
;
5830 promoted_type
= c_type_promotes_to (type
);
5832 DECL_ARG_TYPE (decl
) = promoted_type
;
5833 if (declspecs
->inline_p
)
5834 pedwarn (loc
, 0, "parameter %q+D declared %<inline%>", decl
);
5836 else if (decl_context
== FIELD
)
5838 /* Note that the grammar rejects storage classes in typenames
5840 gcc_assert (storage_class
== csc_none
&& !threadp
5841 && !declspecs
->inline_p
);
5843 /* Structure field. It may not be a function. */
5845 if (TREE_CODE (type
) == FUNCTION_TYPE
)
5847 error_at (loc
, "field %qE declared as a function", name
);
5848 type
= build_pointer_type (type
);
5850 else if (TREE_CODE (type
) != ERROR_MARK
5851 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type
))
5854 error_at (loc
, "field %qE has incomplete type", name
);
5856 error_at (loc
, "unnamed field has incomplete type");
5857 type
= error_mark_node
;
5859 type
= c_build_qualified_type (type
, type_quals
);
5860 decl
= build_decl (declarator
->id_loc
,
5861 FIELD_DECL
, declarator
->u
.id
, type
);
5862 DECL_NONADDRESSABLE_P (decl
) = bitfield
;
5863 if (bitfield
&& !declarator
->u
.id
)
5864 TREE_NO_WARNING (decl
) = 1;
5867 C_DECL_VARIABLE_SIZE (decl
) = 1;
5869 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
5871 if (storage_class
== csc_register
|| threadp
)
5873 error_at (loc
, "invalid storage class for function %qE", name
);
5875 else if (current_scope
!= file_scope
)
5877 /* Function declaration not at file scope. Storage
5878 classes other than `extern' are not allowed, C99
5879 6.7.1p5, and `extern' makes no difference. However,
5880 GCC allows 'auto', perhaps with 'inline', to support
5881 nested functions. */
5882 if (storage_class
== csc_auto
)
5883 pedwarn (loc
, OPT_pedantic
,
5884 "invalid storage class for function %qE", name
);
5885 else if (storage_class
== csc_static
)
5887 error_at (loc
, "invalid storage class for function %qE", name
);
5889 storage_class
= declspecs
->storage_class
= csc_none
;
5895 decl
= build_decl (declarator
->id_loc
,
5896 FUNCTION_DECL
, declarator
->u
.id
, type
);
5897 decl
= build_decl_attribute_variant (decl
, decl_attr
);
5899 if (pedantic
&& type_quals
&& !DECL_IN_SYSTEM_HEADER (decl
))
5900 pedwarn (loc
, OPT_pedantic
,
5901 "ISO C forbids qualified function types");
5903 /* Every function declaration is an external reference
5904 (DECL_EXTERNAL) except for those which are not at file
5905 scope and are explicitly declared "auto". This is
5906 forbidden by standard C (C99 6.7.1p5) and is interpreted by
5907 GCC to signify a forward declaration of a nested function. */
5908 if (storage_class
== csc_auto
&& current_scope
!= file_scope
)
5909 DECL_EXTERNAL (decl
) = 0;
5910 /* In C99, a function which is declared 'inline' with 'extern'
5911 is not an external reference (which is confusing). It
5912 means that the later definition of the function must be output
5913 in this file, C99 6.7.4p6. In GNU C89, a function declared
5914 'extern inline' is an external reference. */
5915 else if (declspecs
->inline_p
&& storage_class
!= csc_static
)
5916 DECL_EXTERNAL (decl
) = ((storage_class
== csc_extern
)
5917 == flag_gnu89_inline
);
5919 DECL_EXTERNAL (decl
) = !initialized
;
5921 /* Record absence of global scope for `static' or `auto'. */
5923 = !(storage_class
== csc_static
|| storage_class
== csc_auto
);
5925 /* For a function definition, record the argument information
5926 block where store_parm_decls will look for it. */
5928 current_function_arg_info
= arg_info
;
5930 if (declspecs
->default_int_p
)
5931 C_FUNCTION_IMPLICIT_INT (decl
) = 1;
5933 /* Record presence of `inline', if it is reasonable. */
5934 if (flag_hosted
&& MAIN_NAME_P (declarator
->u
.id
))
5936 if (declspecs
->inline_p
)
5937 pedwarn (loc
, 0, "cannot inline function %<main%>");
5939 else if (declspecs
->inline_p
)
5940 /* Record that the function is declared `inline'. */
5941 DECL_DECLARED_INLINE_P (decl
) = 1;
5945 /* It's a variable. */
5946 /* An uninitialized decl with `extern' is a reference. */
5947 int extern_ref
= !initialized
&& storage_class
== csc_extern
;
5949 type
= c_build_qualified_type (type
, type_quals
);
5951 /* C99 6.2.2p7: It is invalid (compile-time undefined
5952 behavior) to create an 'extern' declaration for a
5953 variable if there is a global declaration that is
5954 'static' and the global declaration is not visible.
5955 (If the static declaration _is_ currently visible,
5956 the 'extern' declaration is taken to refer to that decl.) */
5957 if (extern_ref
&& current_scope
!= file_scope
)
5959 tree global_decl
= identifier_global_value (declarator
->u
.id
);
5960 tree visible_decl
= lookup_name (declarator
->u
.id
);
5963 && global_decl
!= visible_decl
5964 && TREE_CODE (global_decl
) == VAR_DECL
5965 && !TREE_PUBLIC (global_decl
))
5966 error_at (loc
, "variable previously declared %<static%> "
5967 "redeclared %<extern%>");
5970 decl
= build_decl (declarator
->id_loc
,
5971 VAR_DECL
, declarator
->u
.id
, type
);
5973 C_DECL_VARIABLE_SIZE (decl
) = 1;
5975 if (declspecs
->inline_p
)
5976 pedwarn (loc
, 0, "variable %q+D declared %<inline%>", decl
);
5978 /* At file scope, an initialized extern declaration may follow
5979 a static declaration. In that case, DECL_EXTERNAL will be
5980 reset later in start_decl. */
5981 DECL_EXTERNAL (decl
) = (storage_class
== csc_extern
);
5983 /* At file scope, the presence of a `static' or `register' storage
5984 class specifier, or the absence of all storage class specifiers
5985 makes this declaration a definition (perhaps tentative). Also,
5986 the absence of `static' makes it public. */
5987 if (current_scope
== file_scope
)
5989 TREE_PUBLIC (decl
) = storage_class
!= csc_static
;
5990 TREE_STATIC (decl
) = !extern_ref
;
5992 /* Not at file scope, only `static' makes a static definition. */
5995 TREE_STATIC (decl
) = (storage_class
== csc_static
);
5996 TREE_PUBLIC (decl
) = extern_ref
;
6000 DECL_TLS_MODEL (decl
) = decl_default_tls_model (decl
);
6003 if ((storage_class
== csc_extern
6004 || (storage_class
== csc_none
6005 && TREE_CODE (type
) == FUNCTION_TYPE
6007 && variably_modified_type_p (type
, NULL_TREE
))
6010 if (TREE_CODE (type
) == FUNCTION_TYPE
)
6011 error_at (loc
, "non-nested function with variably modified type");
6013 error_at (loc
, "object with variably modified type must have "
6017 /* Record `register' declaration for warnings on &
6018 and in case doing stupid register allocation. */
6020 if (storage_class
== csc_register
)
6022 C_DECL_REGISTER (decl
) = 1;
6023 DECL_REGISTER (decl
) = 1;
6026 /* Record constancy and volatility. */
6027 c_apply_type_quals_to_decl (type_quals
, decl
);
6029 /* If a type has volatile components, it should be stored in memory.
6030 Otherwise, the fact that those components are volatile
6031 will be ignored, and would even crash the compiler.
6032 Of course, this only makes sense on VAR,PARM, and RESULT decl's. */
6033 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl
))
6034 && (TREE_CODE (decl
) == VAR_DECL
|| TREE_CODE (decl
) == PARM_DECL
6035 || TREE_CODE (decl
) == RESULT_DECL
))
6037 /* It is not an error for a structure with volatile fields to
6038 be declared register, but reset DECL_REGISTER since it
6039 cannot actually go in a register. */
6040 int was_reg
= C_DECL_REGISTER (decl
);
6041 C_DECL_REGISTER (decl
) = 0;
6042 DECL_REGISTER (decl
) = 0;
6043 c_mark_addressable (decl
);
6044 C_DECL_REGISTER (decl
) = was_reg
;
6047 /* This is the earliest point at which we might know the assembler
6048 name of a variable. Thus, if it's known before this, die horribly. */
6049 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl
));
6052 && TREE_CODE (decl
) == VAR_DECL
6053 && TREE_PUBLIC (decl
)
6054 && TREE_STATIC (decl
)
6055 && (TREE_CODE (TREE_TYPE (decl
)) == RECORD_TYPE
6056 || TREE_CODE (TREE_TYPE (decl
)) == UNION_TYPE
6057 || TREE_CODE (TREE_TYPE (decl
)) == ENUMERAL_TYPE
)
6058 && TYPE_NAME (TREE_TYPE (decl
)) == NULL_TREE
)
6059 warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wc___compat
,
6060 ("non-local variable %qD with anonymous type is "
6061 "questionable in C++"),
6068 /* Decode the parameter-list info for a function type or function definition.
6069 The argument is the value returned by `get_parm_info' (or made in c-parse.c
6070 if there is an identifier list instead of a parameter decl list).
6071 These two functions are separate because when a function returns
6072 or receives functions then each is called multiple times but the order
6073 of calls is different. The last call to `grokparms' is always the one
6074 that contains the formal parameter names of a function definition.
6076 Return a list of arg types to use in the FUNCTION_TYPE for this function.
6078 FUNCDEF_FLAG is true for a function definition, false for
6079 a mere declaration. A nonempty identifier-list gets an error message
6080 when FUNCDEF_FLAG is false. */
6083 grokparms (struct c_arg_info
*arg_info
, bool funcdef_flag
)
6085 tree arg_types
= arg_info
->types
;
6087 if (funcdef_flag
&& arg_info
->had_vla_unspec
)
6089 /* A function definition isn't function prototype scope C99 6.2.1p4. */
6091 error ("%<[*]%> not allowed in other than function prototype scope");
6094 if (arg_types
== 0 && !funcdef_flag
&& !in_system_header
)
6095 warning (OPT_Wstrict_prototypes
,
6096 "function declaration isn%'t a prototype");
6098 if (arg_types
== error_mark_node
)
6099 return 0; /* don't set TYPE_ARG_TYPES in this case */
6101 else if (arg_types
&& TREE_CODE (TREE_VALUE (arg_types
)) == IDENTIFIER_NODE
)
6104 pedwarn (input_location
, 0, "parameter names (without types) in function declaration");
6106 arg_info
->parms
= arg_info
->types
;
6107 arg_info
->types
= 0;
6112 tree parm
, type
, typelt
;
6113 unsigned int parmno
;
6116 /* If there is a parameter of incomplete type in a definition,
6117 this is an error. In a declaration this is valid, and a
6118 struct or union type may be completed later, before any calls
6119 or definition of the function. In the case where the tag was
6120 first declared within the parameter list, a warning has
6121 already been given. If a parameter has void type, then
6122 however the function cannot be defined or called, so
6125 for (parm
= arg_info
->parms
, typelt
= arg_types
, parmno
= 1;
6127 parm
= DECL_CHAIN (parm
), typelt
= TREE_CHAIN (typelt
), parmno
++)
6129 type
= TREE_VALUE (typelt
);
6130 if (type
== error_mark_node
)
6133 if (!COMPLETE_TYPE_P (type
))
6137 if (DECL_NAME (parm
))
6138 error_at (input_location
,
6139 "parameter %u (%q+D) has incomplete type",
6142 error_at (DECL_SOURCE_LOCATION (parm
),
6143 "parameter %u has incomplete type",
6146 TREE_VALUE (typelt
) = error_mark_node
;
6147 TREE_TYPE (parm
) = error_mark_node
;
6148 arg_types
= NULL_TREE
;
6150 else if (VOID_TYPE_P (type
))
6152 if (DECL_NAME (parm
))
6153 warning_at (input_location
, 0,
6154 "parameter %u (%q+D) has void type",
6157 warning_at (DECL_SOURCE_LOCATION (parm
), 0,
6158 "parameter %u has void type",
6163 errmsg
= targetm
.invalid_parameter_type (type
);
6167 TREE_VALUE (typelt
) = error_mark_node
;
6168 TREE_TYPE (parm
) = error_mark_node
;
6169 arg_types
= NULL_TREE
;
6172 if (DECL_NAME (parm
) && TREE_USED (parm
))
6173 warn_if_shadowing (parm
);
6179 /* Allocate and initialize a c_arg_info structure from the parser's
6183 build_arg_info (void)
6185 struct c_arg_info
*ret
= XOBNEW (&parser_obstack
, struct c_arg_info
);
6186 ret
->parms
= NULL_TREE
;
6188 ret
->types
= NULL_TREE
;
6189 ret
->others
= NULL_TREE
;
6190 ret
->pending_sizes
= NULL
;
6191 ret
->had_vla_unspec
= 0;
6195 /* Take apart the current scope and return a c_arg_info structure with
6196 info on a parameter list just parsed.
6198 This structure is later fed to 'grokparms' and 'store_parm_decls'.
6200 ELLIPSIS being true means the argument list ended in '...' so don't
6201 append a sentinel (void_list_node) to the end of the type-list. */
6204 get_parm_info (bool ellipsis
)
6206 struct c_binding
*b
= current_scope
->bindings
;
6207 struct c_arg_info
*arg_info
= build_arg_info ();
6210 VEC(c_arg_tag
,gc
) *tags
= NULL
;
6214 static bool explained_incomplete_types
= false;
6215 bool gave_void_only_once_err
= false;
6217 arg_info
->had_vla_unspec
= current_scope
->had_vla_unspec
;
6219 /* The bindings in this scope must not get put into a block.
6220 We will take care of deleting the binding nodes. */
6221 current_scope
->bindings
= 0;
6223 /* This function is only called if there was *something* on the
6227 /* A parameter list consisting solely of 'void' indicates that the
6228 function takes no arguments. But if the 'void' is qualified
6229 (by 'const' or 'volatile'), or has a storage class specifier
6230 ('register'), then the behavior is undefined; issue an error.
6231 Typedefs for 'void' are OK (see DR#157). */
6232 if (b
->prev
== 0 /* one binding */
6233 && TREE_CODE (b
->decl
) == PARM_DECL
/* which is a parameter */
6234 && !DECL_NAME (b
->decl
) /* anonymous */
6235 && VOID_TYPE_P (TREE_TYPE (b
->decl
))) /* of void type */
6237 if (TREE_THIS_VOLATILE (b
->decl
)
6238 || TREE_READONLY (b
->decl
)
6239 || C_DECL_REGISTER (b
->decl
))
6240 error ("%<void%> as only parameter may not be qualified");
6242 /* There cannot be an ellipsis. */
6244 error ("%<void%> must be the only parameter");
6246 arg_info
->types
= void_list_node
;
6251 types
= void_list_node
;
6253 /* Break up the bindings list into parms, tags, types, and others;
6254 apply sanity checks; purge the name-to-decl bindings. */
6257 tree decl
= b
->decl
;
6258 tree type
= TREE_TYPE (decl
);
6260 const char *keyword
;
6262 switch (TREE_CODE (decl
))
6267 gcc_assert (I_SYMBOL_BINDING (b
->id
) == b
);
6268 I_SYMBOL_BINDING (b
->id
) = b
->shadowed
;
6271 /* Check for forward decls that never got their actual decl. */
6272 if (TREE_ASM_WRITTEN (decl
))
6273 error ("parameter %q+D has just a forward declaration", decl
);
6274 /* Check for (..., void, ...) and issue an error. */
6275 else if (VOID_TYPE_P (type
) && !DECL_NAME (decl
))
6277 if (!gave_void_only_once_err
)
6279 error ("%<void%> must be the only parameter");
6280 gave_void_only_once_err
= true;
6285 /* Valid parameter, add it to the list. */
6286 DECL_CHAIN (decl
) = parms
;
6289 /* Since there is a prototype, args are passed in their
6290 declared types. The back end may override this later. */
6291 DECL_ARG_TYPE (decl
) = type
;
6292 types
= tree_cons (0, type
, types
);
6296 case ENUMERAL_TYPE
: keyword
= "enum"; goto tag
;
6297 case UNION_TYPE
: keyword
= "union"; goto tag
;
6298 case RECORD_TYPE
: keyword
= "struct"; goto tag
;
6300 /* Types may not have tag-names, in which case the type
6301 appears in the bindings list with b->id NULL. */
6304 gcc_assert (I_TAG_BINDING (b
->id
) == b
);
6305 I_TAG_BINDING (b
->id
) = b
->shadowed
;
6308 /* Warn about any struct, union or enum tags defined in a
6309 parameter list. The scope of such types is limited to
6310 the parameter list, which is rarely if ever desirable
6311 (it's impossible to call such a function with type-
6312 correct arguments). An anonymous union parm type is
6313 meaningful as a GNU extension, so don't warn for that. */
6314 if (TREE_CODE (decl
) != UNION_TYPE
|| b
->id
!= 0)
6317 /* The %s will be one of 'struct', 'union', or 'enum'. */
6318 warning (0, "%<%s %E%> declared inside parameter list",
6321 /* The %s will be one of 'struct', 'union', or 'enum'. */
6322 warning (0, "anonymous %s declared inside parameter list",
6325 if (!explained_incomplete_types
)
6327 warning (0, "its scope is only this definition or declaration,"
6328 " which is probably not what you want");
6329 explained_incomplete_types
= true;
6333 tag
= VEC_safe_push (c_arg_tag
, gc
, tags
, NULL
);
6341 /* CONST_DECLs appear here when we have an embedded enum,
6342 and TYPE_DECLs appear here when we have an embedded struct
6343 or union. No warnings for this - we already warned about the
6344 type itself. FUNCTION_DECLs appear when there is an implicit
6345 function declaration in the parameter list. */
6347 /* When we reinsert this decl in the function body, we need
6348 to reconstruct whether it was marked as nested. */
6349 gcc_assert (TREE_CODE (decl
) == FUNCTION_DECL
6352 DECL_CHAIN (decl
) = others
;
6357 /* error_mark_node appears here when we have an undeclared
6358 variable. Just throw it away. */
6361 gcc_assert (I_SYMBOL_BINDING (b
->id
) == b
);
6362 I_SYMBOL_BINDING (b
->id
) = b
->shadowed
;
6366 /* Other things that might be encountered. */
6373 b
= free_binding_and_advance (b
);
6376 arg_info
->parms
= parms
;
6377 arg_info
->tags
= tags
;
6378 arg_info
->types
= types
;
6379 arg_info
->others
= others
;
6380 arg_info
->pending_sizes
= get_pending_sizes ();
6384 /* Get the struct, enum or union (CODE says which) with tag NAME.
6385 Define the tag as a forward-reference with location LOC if it is
6386 not defined. Return a c_typespec structure for the type
6390 parser_xref_tag (location_t loc
, enum tree_code code
, tree name
)
6392 struct c_typespec ret
;
6396 ret
.expr
= NULL_TREE
;
6397 ret
.expr_const_operands
= true;
6399 /* If a cross reference is requested, look up the type
6400 already defined for this tag and return it. */
6402 ref
= lookup_tag (code
, name
, 0, &refloc
);
6403 /* If this is the right type of tag, return what we found.
6404 (This reference will be shadowed by shadow_tag later if appropriate.)
6405 If this is the wrong type of tag, do not return it. If it was the
6406 wrong type in the same scope, we will have had an error
6407 message already; if in a different scope and declaring
6408 a name, pending_xref_error will give an error message; but if in a
6409 different scope and not declaring a name, this tag should
6410 shadow the previous declaration of a different type of tag, and
6411 this would not work properly if we return the reference found.
6412 (For example, with "struct foo" in an outer scope, "union foo;"
6413 must shadow that tag with a new one of union type.) */
6414 ret
.kind
= (ref
? ctsk_tagref
: ctsk_tagfirstref
);
6415 if (ref
&& TREE_CODE (ref
) == code
)
6417 if (C_TYPE_DEFINED_IN_STRUCT (ref
)
6418 && loc
!= UNKNOWN_LOCATION
6424 warning_at (loc
, OPT_Wc___compat
,
6425 ("enum type defined in struct or union "
6426 "is not visible in C++"));
6427 inform (refloc
, "enum type defined here");
6430 warning_at (loc
, OPT_Wc___compat
,
6431 ("struct defined in struct or union "
6432 "is not visible in C++"));
6433 inform (refloc
, "struct defined here");
6436 warning_at (loc
, OPT_Wc___compat
,
6437 ("union defined in struct or union "
6438 "is not visible in C++"));
6439 inform (refloc
, "union defined here");
6450 /* If no such tag is yet defined, create a forward-reference node
6451 and record it as the "definition".
6452 When a real declaration of this type is found,
6453 the forward-reference will be altered into a real type. */
6455 ref
= make_node (code
);
6456 if (code
== ENUMERAL_TYPE
)
6458 /* Give the type a default layout like unsigned int
6459 to avoid crashing if it does not get defined. */
6460 SET_TYPE_MODE (ref
, TYPE_MODE (unsigned_type_node
));
6461 TYPE_ALIGN (ref
) = TYPE_ALIGN (unsigned_type_node
);
6462 TYPE_USER_ALIGN (ref
) = 0;
6463 TYPE_UNSIGNED (ref
) = 1;
6464 TYPE_PRECISION (ref
) = TYPE_PRECISION (unsigned_type_node
);
6465 TYPE_MIN_VALUE (ref
) = TYPE_MIN_VALUE (unsigned_type_node
);
6466 TYPE_MAX_VALUE (ref
) = TYPE_MAX_VALUE (unsigned_type_node
);
6469 pushtag (loc
, name
, ref
);
6475 /* Get the struct, enum or union (CODE says which) with tag NAME.
6476 Define the tag as a forward-reference if it is not defined.
6477 Return a tree for the type. */
6480 xref_tag (enum tree_code code
, tree name
)
6482 return parser_xref_tag (input_location
, code
, name
).spec
;
6485 /* Make sure that the tag NAME is defined *in the current scope*
6486 at least as a forward reference.
6487 LOC is the location of the struct's definition.
6488 CODE says which kind of tag NAME ought to be.
6490 This stores the current value of the file static STRUCT_PARSE_INFO
6491 in *ENCLOSING_STRUCT_PARSE_INFO, and points STRUCT_PARSE_INFO at a
6492 new c_struct_parse_info structure. The old value of
6493 STRUCT_PARSE_INFO is restored in finish_struct. */
6496 start_struct (location_t loc
, enum tree_code code
, tree name
,
6497 struct c_struct_parse_info
**enclosing_struct_parse_info
)
6499 /* If there is already a tag defined at this scope
6500 (as a forward reference), just return it. */
6502 tree ref
= NULL_TREE
;
6503 location_t refloc
= UNKNOWN_LOCATION
;
6505 if (name
!= NULL_TREE
)
6506 ref
= lookup_tag (code
, name
, 1, &refloc
);
6507 if (ref
&& TREE_CODE (ref
) == code
)
6509 if (TYPE_SIZE (ref
))
6511 if (code
== UNION_TYPE
)
6512 error_at (loc
, "redefinition of %<union %E%>", name
);
6514 error_at (loc
, "redefinition of %<struct %E%>", name
);
6515 if (refloc
!= UNKNOWN_LOCATION
)
6516 inform (refloc
, "originally defined here");
6517 /* Don't create structures using a name already in use. */
6520 else if (C_TYPE_BEING_DEFINED (ref
))
6522 if (code
== UNION_TYPE
)
6523 error_at (loc
, "nested redefinition of %<union %E%>", name
);
6525 error_at (loc
, "nested redefinition of %<struct %E%>", name
);
6526 /* Don't bother to report "originally defined here" for a
6527 nested redefinition; the original definition should be
6529 /* Don't create structures that contain themselves. */
6534 /* Otherwise create a forward-reference just so the tag is in scope. */
6536 if (ref
== NULL_TREE
|| TREE_CODE (ref
) != code
)
6538 ref
= make_node (code
);
6539 pushtag (loc
, name
, ref
);
6542 C_TYPE_BEING_DEFINED (ref
) = 1;
6543 TYPE_PACKED (ref
) = flag_pack_struct
;
6545 *enclosing_struct_parse_info
= struct_parse_info
;
6546 struct_parse_info
= XNEW (struct c_struct_parse_info
);
6547 struct_parse_info
->struct_types
= VEC_alloc (tree
, heap
, 0);
6548 struct_parse_info
->fields
= VEC_alloc (c_binding_ptr
, heap
, 0);
6549 struct_parse_info
->typedefs_seen
= VEC_alloc (tree
, heap
, 0);
6551 /* FIXME: This will issue a warning for a use of a type defined
6552 within a statement expr used within sizeof, et. al. This is not
6553 terribly serious as C++ doesn't permit statement exprs within
6555 if (warn_cxx_compat
&& (in_sizeof
|| in_typeof
|| in_alignof
))
6556 warning_at (loc
, OPT_Wc___compat
,
6557 "defining type in %qs expression is invalid in C++",
6560 : (in_typeof
? "typeof" : "alignof")));
6565 /* Process the specs, declarator and width (NULL if omitted)
6566 of a structure component, returning a FIELD_DECL node.
6567 WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node.
6568 DECL_ATTRS is as for grokdeclarator.
6570 LOC is the location of the structure component.
6572 This is done during the parsing of the struct declaration.
6573 The FIELD_DECL nodes are chained together and the lot of them
6574 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
6577 grokfield (location_t loc
,
6578 struct c_declarator
*declarator
, struct c_declspecs
*declspecs
,
6579 tree width
, tree
*decl_attrs
)
6583 if (declarator
->kind
== cdk_id
&& declarator
->u
.id
== NULL_TREE
6584 && width
== NULL_TREE
)
6586 /* This is an unnamed decl.
6588 If we have something of the form "union { list } ;" then this
6589 is the anonymous union extension. Similarly for struct.
6591 If this is something of the form "struct foo;", then
6592 If MS extensions are enabled, this is handled as an
6594 Otherwise this is a forward declaration of a structure tag.
6596 If this is something of the form "foo;" and foo is a TYPE_DECL, then
6597 If foo names a structure or union without a tag, then this
6598 is an anonymous struct (this is permitted by C1X).
6599 If MS extensions are enabled and foo names a structure, then
6600 again this is an anonymous struct.
6601 Otherwise this is an error.
6603 Oh what a horrid tangled web we weave. I wonder if MS consciously
6604 took this from Plan 9 or if it was an accident of implementation
6605 that took root before someone noticed the bug... */
6607 tree type
= declspecs
->type
;
6608 bool type_ok
= (TREE_CODE (type
) == RECORD_TYPE
6609 || TREE_CODE (type
) == UNION_TYPE
);
6614 if (flag_ms_extensions
)
6616 else if (TYPE_NAME (TYPE_MAIN_VARIANT (type
)) == NULL
)
6623 pedwarn (loc
, 0, "declaration does not declare anything");
6629 pedwarn (loc
, OPT_pedantic
,
6630 "ISO C99 doesn%'t support unnamed structs/unions");
6632 pedwarn (loc
, OPT_pedantic
,
6633 "ISO C90 doesn%'t support unnamed structs/unions");
6637 value
= grokdeclarator (declarator
, declspecs
, FIELD
, false,
6638 width
? &width
: NULL
, decl_attrs
, NULL
, NULL
,
6641 finish_decl (value
, loc
, NULL_TREE
, NULL_TREE
, NULL_TREE
);
6642 DECL_INITIAL (value
) = width
;
6644 if (warn_cxx_compat
&& DECL_NAME (value
) != NULL_TREE
)
6646 /* If we currently have a binding for this field, set the
6647 in_struct field in the binding, so that we warn about lookups
6649 struct c_binding
*b
= I_SYMBOL_BINDING (DECL_NAME (value
));
6652 /* If the in_struct field is not yet set, push it on a list
6653 to be cleared when this struct is finished. */
6656 VEC_safe_push (c_binding_ptr
, heap
,
6657 struct_parse_info
->fields
, b
);
6666 /* Subroutine of detect_field_duplicates: add the fields of FIELDLIST
6667 to HTAB, giving errors for any duplicates. */
6670 detect_field_duplicates_hash (tree fieldlist
, htab_t htab
)
6675 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
6676 if ((y
= DECL_NAME (x
)) != 0)
6678 slot
= htab_find_slot (htab
, y
, INSERT
);
6681 error ("duplicate member %q+D", x
);
6682 DECL_NAME (x
) = NULL_TREE
;
6686 else if (TREE_CODE (TREE_TYPE (x
)) == RECORD_TYPE
6687 || TREE_CODE (TREE_TYPE (x
)) == UNION_TYPE
)
6688 detect_field_duplicates_hash (TYPE_FIELDS (TREE_TYPE (x
)), htab
);
6691 /* Generate an error for any duplicate field names in FIELDLIST. Munge
6692 the list such that this does not present a problem later. */
6695 detect_field_duplicates (tree fieldlist
)
6700 /* First, see if there are more than "a few" fields.
6701 This is trivially true if there are zero or one fields. */
6704 x
= DECL_CHAIN (fieldlist
);
6709 if (DECL_NAME (x
) == NULL_TREE
6710 && (TREE_CODE (TREE_TYPE (x
)) == RECORD_TYPE
6711 || TREE_CODE (TREE_TYPE (x
)) == UNION_TYPE
))
6714 } while (timeout
> 0 && x
);
6716 /* If there were "few" fields and no anonymous structures or unions,
6717 avoid the overhead of allocating a hash table. Instead just do
6718 the nested traversal thing. */
6721 for (x
= DECL_CHAIN (fieldlist
); x
; x
= DECL_CHAIN (x
))
6724 for (y
= fieldlist
; y
!= x
; y
= TREE_CHAIN (y
))
6725 if (DECL_NAME (y
) == DECL_NAME (x
))
6727 error ("duplicate member %q+D", x
);
6728 DECL_NAME (x
) = NULL_TREE
;
6734 htab_t htab
= htab_create (37, htab_hash_pointer
, htab_eq_pointer
, NULL
);
6736 detect_field_duplicates_hash (fieldlist
, htab
);
6741 /* Finish up struct info used by -Wc++-compat. */
6744 warn_cxx_compat_finish_struct (tree fieldlist
)
6748 struct c_binding
*b
;
6750 /* Set the C_TYPE_DEFINED_IN_STRUCT flag for each type defined in
6751 the current struct. We do this now at the end of the struct
6752 because the flag is used to issue visibility warnings, and we
6753 only want to issue those warnings if the type is referenced
6754 outside of the struct declaration. */
6755 for (ix
= 0; VEC_iterate (tree
, struct_parse_info
->struct_types
, ix
, x
); ++ix
)
6756 C_TYPE_DEFINED_IN_STRUCT (x
) = 1;
6758 /* The TYPEDEFS_SEEN field of STRUCT_PARSE_INFO is a list of
6759 typedefs used when declaring fields in this struct. If the name
6760 of any of the fields is also a typedef name then the struct would
6761 not parse in C++, because the C++ lookup rules say that the
6762 typedef name would be looked up in the context of the struct, and
6763 would thus be the field rather than the typedef. */
6764 if (!VEC_empty (tree
, struct_parse_info
->typedefs_seen
)
6765 && fieldlist
!= NULL_TREE
)
6767 /* Use a pointer_set using the name of the typedef. We can use
6768 a pointer_set because identifiers are interned. */
6769 struct pointer_set_t
*tset
= pointer_set_create ();
6772 VEC_iterate (tree
, struct_parse_info
->typedefs_seen
, ix
, x
);
6774 pointer_set_insert (tset
, DECL_NAME (x
));
6776 for (x
= fieldlist
; x
!= NULL_TREE
; x
= DECL_CHAIN (x
))
6778 if (pointer_set_contains (tset
, DECL_NAME (x
)))
6780 warning_at (DECL_SOURCE_LOCATION (x
), OPT_Wc___compat
,
6781 ("using %qD as both field and typedef name is "
6784 /* FIXME: It would be nice to report the location where
6785 the typedef name is used. */
6789 pointer_set_destroy (tset
);
6792 /* For each field which has a binding and which was not defined in
6793 an enclosing struct, clear the in_struct field. */
6795 VEC_iterate (c_binding_ptr
, struct_parse_info
->fields
, ix
, b
);
6800 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
6801 LOC is the location of the RECORD_TYPE or UNION_TYPE's definition.
6802 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
6803 ATTRIBUTES are attributes to be applied to the structure.
6805 ENCLOSING_STRUCT_PARSE_INFO is the value of STRUCT_PARSE_INFO when
6806 the struct was started. */
6809 finish_struct (location_t loc
, tree t
, tree fieldlist
, tree attributes
,
6810 struct c_struct_parse_info
*enclosing_struct_parse_info
)
6813 bool toplevel
= file_scope
== current_scope
;
6814 int saw_named_field
;
6816 /* If this type was previously laid out as a forward reference,
6817 make sure we lay it out again. */
6821 decl_attributes (&t
, attributes
, (int) ATTR_FLAG_TYPE_IN_PLACE
);
6825 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
6827 if (DECL_NAME (x
) != 0)
6830 && (TREE_CODE (TREE_TYPE (x
)) == RECORD_TYPE
6831 || TREE_CODE (TREE_TYPE (x
)) == UNION_TYPE
))
6837 if (TREE_CODE (t
) == UNION_TYPE
)
6840 pedwarn (loc
, OPT_pedantic
, "union has no named members");
6842 pedwarn (loc
, OPT_pedantic
, "union has no members");
6847 pedwarn (loc
, OPT_pedantic
, "struct has no named members");
6849 pedwarn (loc
, OPT_pedantic
, "struct has no members");
6854 /* Install struct as DECL_CONTEXT of each field decl.
6855 Also process specified field sizes, found in the DECL_INITIAL,
6856 storing 0 there after the type has been changed to precision equal
6857 to its width, rather than the precision of the specified standard
6858 type. (Correct layout requires the original type to have been preserved
6861 saw_named_field
= 0;
6862 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
6864 if (TREE_TYPE (x
) == error_mark_node
)
6867 DECL_CONTEXT (x
) = t
;
6869 /* If any field is const, the structure type is pseudo-const. */
6870 if (TREE_READONLY (x
))
6871 C_TYPE_FIELDS_READONLY (t
) = 1;
6874 /* A field that is pseudo-const makes the structure likewise. */
6875 tree t1
= TREE_TYPE (x
);
6876 while (TREE_CODE (t1
) == ARRAY_TYPE
)
6877 t1
= TREE_TYPE (t1
);
6878 if ((TREE_CODE (t1
) == RECORD_TYPE
|| TREE_CODE (t1
) == UNION_TYPE
)
6879 && C_TYPE_FIELDS_READONLY (t1
))
6880 C_TYPE_FIELDS_READONLY (t
) = 1;
6883 /* Any field that is volatile means variables of this type must be
6884 treated in some ways as volatile. */
6885 if (TREE_THIS_VOLATILE (x
))
6886 C_TYPE_FIELDS_VOLATILE (t
) = 1;
6888 /* Any field of nominal variable size implies structure is too. */
6889 if (C_DECL_VARIABLE_SIZE (x
))
6890 C_TYPE_VARIABLE_SIZE (t
) = 1;
6892 if (DECL_INITIAL (x
))
6894 unsigned HOST_WIDE_INT width
= tree_low_cst (DECL_INITIAL (x
), 1);
6895 DECL_SIZE (x
) = bitsize_int (width
);
6896 DECL_BIT_FIELD (x
) = 1;
6897 SET_DECL_C_BIT_FIELD (x
);
6901 && (DECL_BIT_FIELD (x
)
6902 || TYPE_ALIGN (TREE_TYPE (x
)) > BITS_PER_UNIT
))
6903 DECL_PACKED (x
) = 1;
6905 /* Detect flexible array member in an invalid context. */
6906 if (TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
6907 && TYPE_SIZE (TREE_TYPE (x
)) == NULL_TREE
6908 && TYPE_DOMAIN (TREE_TYPE (x
)) != NULL_TREE
6909 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x
))) == NULL_TREE
)
6911 if (TREE_CODE (t
) == UNION_TYPE
)
6913 error_at (DECL_SOURCE_LOCATION (x
),
6914 "flexible array member in union");
6915 TREE_TYPE (x
) = error_mark_node
;
6917 else if (DECL_CHAIN (x
) != NULL_TREE
)
6919 error_at (DECL_SOURCE_LOCATION (x
),
6920 "flexible array member not at end of struct");
6921 TREE_TYPE (x
) = error_mark_node
;
6923 else if (!saw_named_field
)
6925 error_at (DECL_SOURCE_LOCATION (x
),
6926 "flexible array member in otherwise empty struct");
6927 TREE_TYPE (x
) = error_mark_node
;
6931 if (pedantic
&& TREE_CODE (t
) == RECORD_TYPE
6932 && flexible_array_type_p (TREE_TYPE (x
)))
6933 pedwarn (DECL_SOURCE_LOCATION (x
), OPT_pedantic
,
6934 "invalid use of structure with flexible array member");
6937 || TREE_CODE (TREE_TYPE (x
)) == RECORD_TYPE
6938 || TREE_CODE (TREE_TYPE (x
)) == UNION_TYPE
)
6939 saw_named_field
= 1;
6942 detect_field_duplicates (fieldlist
);
6944 /* Now we have the nearly final fieldlist. Record it,
6945 then lay out the structure or union (including the fields). */
6947 TYPE_FIELDS (t
) = fieldlist
;
6951 /* Give bit-fields their proper types. */
6953 tree
*fieldlistp
= &fieldlist
;
6955 if (TREE_CODE (*fieldlistp
) == FIELD_DECL
&& DECL_INITIAL (*fieldlistp
)
6956 && TREE_TYPE (*fieldlistp
) != error_mark_node
)
6958 unsigned HOST_WIDE_INT width
6959 = tree_low_cst (DECL_INITIAL (*fieldlistp
), 1);
6960 tree type
= TREE_TYPE (*fieldlistp
);
6961 if (width
!= TYPE_PRECISION (type
))
6963 TREE_TYPE (*fieldlistp
)
6964 = c_build_bitfield_integer_type (width
, TYPE_UNSIGNED (type
));
6965 DECL_MODE (*fieldlistp
) = TYPE_MODE (TREE_TYPE (*fieldlistp
));
6967 DECL_INITIAL (*fieldlistp
) = 0;
6970 fieldlistp
= &DECL_CHAIN (*fieldlistp
);
6973 /* Now we have the truly final field list.
6974 Store it in this type and in the variants. */
6976 TYPE_FIELDS (t
) = fieldlist
;
6978 /* If there are lots of fields, sort so we can look through them fast.
6979 We arbitrarily consider 16 or more elts to be "a lot". */
6984 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
6986 if (len
> 15 || DECL_NAME (x
) == NULL
)
6994 struct lang_type
*space
;
6995 struct sorted_fields_type
*space2
;
6997 len
+= list_length (x
);
6999 /* Use the same allocation policy here that make_node uses, to
7000 ensure that this lives as long as the rest of the struct decl.
7001 All decls in an inline function need to be saved. */
7003 space
= ggc_alloc_cleared_lang_type (sizeof (struct lang_type
));
7004 space2
= ggc_alloc_sorted_fields_type
7005 (sizeof (struct sorted_fields_type
) + len
* sizeof (tree
));
7009 field_array
= &space2
->elts
[0];
7010 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
7012 field_array
[len
++] = x
;
7014 /* If there is anonymous struct or union, break out of the loop. */
7015 if (DECL_NAME (x
) == NULL
)
7018 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
7021 TYPE_LANG_SPECIFIC (t
) = space
;
7022 TYPE_LANG_SPECIFIC (t
)->s
->len
= len
;
7023 field_array
= TYPE_LANG_SPECIFIC (t
)->s
->elts
;
7024 qsort (field_array
, len
, sizeof (tree
), field_decl_cmp
);
7029 for (x
= TYPE_MAIN_VARIANT (t
); x
; x
= TYPE_NEXT_VARIANT (x
))
7031 TYPE_FIELDS (x
) = TYPE_FIELDS (t
);
7032 TYPE_LANG_SPECIFIC (x
) = TYPE_LANG_SPECIFIC (t
);
7033 C_TYPE_FIELDS_READONLY (x
) = C_TYPE_FIELDS_READONLY (t
);
7034 C_TYPE_FIELDS_VOLATILE (x
) = C_TYPE_FIELDS_VOLATILE (t
);
7035 C_TYPE_VARIABLE_SIZE (x
) = C_TYPE_VARIABLE_SIZE (t
);
7038 /* If this was supposed to be a transparent union, but we can't
7039 make it one, warn and turn off the flag. */
7040 if (TREE_CODE (t
) == UNION_TYPE
7041 && TYPE_TRANSPARENT_AGGR (t
)
7042 && (!TYPE_FIELDS (t
) || TYPE_MODE (t
) != DECL_MODE (TYPE_FIELDS (t
))))
7044 TYPE_TRANSPARENT_AGGR (t
) = 0;
7045 warning_at (loc
, 0, "union cannot be made transparent");
7048 /* If this structure or union completes the type of any previous
7049 variable declaration, lay it out and output its rtl. */
7050 for (x
= C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t
));
7054 tree decl
= TREE_VALUE (x
);
7055 if (TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
)
7056 layout_array_type (TREE_TYPE (decl
));
7057 if (TREE_CODE (decl
) != TYPE_DECL
)
7059 layout_decl (decl
, 0);
7060 if (c_dialect_objc ())
7061 objc_check_decl (decl
);
7062 rest_of_decl_compilation (decl
, toplevel
, 0);
7067 C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t
)) = 0;
7069 /* Update type location to the one of the definition, instead of e.g.
7070 a forward declaration. */
7071 if (TYPE_STUB_DECL (t
))
7072 DECL_SOURCE_LOCATION (TYPE_STUB_DECL (t
)) = loc
;
7074 /* Finish debugging output for this type. */
7075 rest_of_type_compilation (t
, toplevel
);
7077 /* If we're inside a function proper, i.e. not file-scope and not still
7078 parsing parameters, then arrange for the size of a variable sized type
7080 if (cur_stmt_list
&& variably_modified_type_p (t
, NULL_TREE
))
7081 add_stmt (build_stmt (loc
,
7082 DECL_EXPR
, build_decl (loc
, TYPE_DECL
, NULL
, t
)));
7084 if (warn_cxx_compat
)
7085 warn_cxx_compat_finish_struct (fieldlist
);
7087 VEC_free (tree
, heap
, struct_parse_info
->struct_types
);
7088 VEC_free (c_binding_ptr
, heap
, struct_parse_info
->fields
);
7089 VEC_free (tree
, heap
, struct_parse_info
->typedefs_seen
);
7090 XDELETE (struct_parse_info
);
7092 struct_parse_info
= enclosing_struct_parse_info
;
7094 /* If this struct is defined inside a struct, add it to
7097 && struct_parse_info
!= NULL
7098 && !in_sizeof
&& !in_typeof
&& !in_alignof
)
7099 VEC_safe_push (tree
, heap
, struct_parse_info
->struct_types
, t
);
7104 /* Lay out the type T, and its element type, and so on. */
7107 layout_array_type (tree t
)
7109 if (TREE_CODE (TREE_TYPE (t
)) == ARRAY_TYPE
)
7110 layout_array_type (TREE_TYPE (t
));
7114 /* Begin compiling the definition of an enumeration type.
7115 NAME is its name (or null if anonymous).
7116 LOC is the enum's location.
7117 Returns the type object, as yet incomplete.
7118 Also records info about it so that build_enumerator
7119 may be used to declare the individual values as they are read. */
7122 start_enum (location_t loc
, struct c_enum_contents
*the_enum
, tree name
)
7124 tree enumtype
= NULL_TREE
;
7125 location_t enumloc
= UNKNOWN_LOCATION
;
7127 /* If this is the real definition for a previous forward reference,
7128 fill in the contents in the same object that used to be the
7129 forward reference. */
7131 if (name
!= NULL_TREE
)
7132 enumtype
= lookup_tag (ENUMERAL_TYPE
, name
, 1, &enumloc
);
7134 if (enumtype
== 0 || TREE_CODE (enumtype
) != ENUMERAL_TYPE
)
7136 enumtype
= make_node (ENUMERAL_TYPE
);
7137 pushtag (loc
, name
, enumtype
);
7140 if (C_TYPE_BEING_DEFINED (enumtype
))
7141 error_at (loc
, "nested redefinition of %<enum %E%>", name
);
7143 C_TYPE_BEING_DEFINED (enumtype
) = 1;
7145 if (TYPE_VALUES (enumtype
) != 0)
7147 /* This enum is a named one that has been declared already. */
7148 error_at (loc
, "redeclaration of %<enum %E%>", name
);
7149 if (enumloc
!= UNKNOWN_LOCATION
)
7150 inform (enumloc
, "originally defined here");
7152 /* Completely replace its old definition.
7153 The old enumerators remain defined, however. */
7154 TYPE_VALUES (enumtype
) = 0;
7157 the_enum
->enum_next_value
= integer_zero_node
;
7158 the_enum
->enum_overflow
= 0;
7160 if (flag_short_enums
)
7161 TYPE_PACKED (enumtype
) = 1;
7163 /* FIXME: This will issue a warning for a use of a type defined
7164 within sizeof in a statement expr. This is not terribly serious
7165 as C++ doesn't permit statement exprs within sizeof anyhow. */
7166 if (warn_cxx_compat
&& (in_sizeof
|| in_typeof
|| in_alignof
))
7167 warning_at (loc
, OPT_Wc___compat
,
7168 "defining type in %qs expression is invalid in C++",
7171 : (in_typeof
? "typeof" : "alignof")));
7176 /* After processing and defining all the values of an enumeration type,
7177 install their decls in the enumeration type and finish it off.
7178 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
7179 and ATTRIBUTES are the specified attributes.
7180 Returns ENUMTYPE. */
7183 finish_enum (tree enumtype
, tree values
, tree attributes
)
7186 tree minnode
= 0, maxnode
= 0;
7187 int precision
, unsign
;
7188 bool toplevel
= (file_scope
== current_scope
);
7189 struct lang_type
*lt
;
7191 decl_attributes (&enumtype
, attributes
, (int) ATTR_FLAG_TYPE_IN_PLACE
);
7193 /* Calculate the maximum value of any enumerator in this type. */
7195 if (values
== error_mark_node
)
7196 minnode
= maxnode
= integer_zero_node
;
7199 minnode
= maxnode
= TREE_VALUE (values
);
7200 for (pair
= TREE_CHAIN (values
); pair
; pair
= TREE_CHAIN (pair
))
7202 tree value
= TREE_VALUE (pair
);
7203 if (tree_int_cst_lt (maxnode
, value
))
7205 if (tree_int_cst_lt (value
, minnode
))
7210 /* Construct the final type of this enumeration. It is the same
7211 as one of the integral types - the narrowest one that fits, except
7212 that normally we only go as narrow as int - and signed iff any of
7213 the values are negative. */
7214 unsign
= (tree_int_cst_sgn (minnode
) >= 0);
7215 precision
= MAX (tree_int_cst_min_precision (minnode
, unsign
),
7216 tree_int_cst_min_precision (maxnode
, unsign
));
7218 if (TYPE_PACKED (enumtype
) || precision
> TYPE_PRECISION (integer_type_node
))
7220 tem
= c_common_type_for_size (precision
, unsign
);
7223 warning (0, "enumeration values exceed range of largest integer");
7224 tem
= long_long_integer_type_node
;
7228 tem
= unsign
? unsigned_type_node
: integer_type_node
;
7230 TYPE_MIN_VALUE (enumtype
) = TYPE_MIN_VALUE (tem
);
7231 TYPE_MAX_VALUE (enumtype
) = TYPE_MAX_VALUE (tem
);
7232 TYPE_UNSIGNED (enumtype
) = TYPE_UNSIGNED (tem
);
7233 TYPE_SIZE (enumtype
) = 0;
7235 /* If the precision of the type was specific with an attribute and it
7236 was too small, give an error. Otherwise, use it. */
7237 if (TYPE_PRECISION (enumtype
))
7239 if (precision
> TYPE_PRECISION (enumtype
))
7240 error ("specified mode too small for enumeral values");
7243 TYPE_PRECISION (enumtype
) = TYPE_PRECISION (tem
);
7245 layout_type (enumtype
);
7247 if (values
!= error_mark_node
)
7249 /* Change the type of the enumerators to be the enum type. We
7250 need to do this irrespective of the size of the enum, for
7251 proper type checking. Replace the DECL_INITIALs of the
7252 enumerators, and the value slots of the list, with copies
7253 that have the enum type; they cannot be modified in place
7254 because they may be shared (e.g. integer_zero_node) Finally,
7255 change the purpose slots to point to the names of the decls. */
7256 for (pair
= values
; pair
; pair
= TREE_CHAIN (pair
))
7258 tree enu
= TREE_PURPOSE (pair
);
7259 tree ini
= DECL_INITIAL (enu
);
7261 TREE_TYPE (enu
) = enumtype
;
7263 /* The ISO C Standard mandates enumerators to have type int,
7264 even though the underlying type of an enum type is
7265 unspecified. However, GCC allows enumerators of any
7266 integer type as an extensions. build_enumerator()
7267 converts any enumerators that fit in an int to type int,
7268 to avoid promotions to unsigned types when comparing
7269 integers with enumerators that fit in the int range.
7270 When -pedantic is given, build_enumerator() would have
7271 already warned about those that don't fit. Here we
7272 convert the rest to the enumerator type. */
7273 if (TREE_TYPE (ini
) != integer_type_node
)
7274 ini
= convert (enumtype
, ini
);
7276 DECL_INITIAL (enu
) = ini
;
7277 TREE_PURPOSE (pair
) = DECL_NAME (enu
);
7278 TREE_VALUE (pair
) = ini
;
7281 TYPE_VALUES (enumtype
) = values
;
7284 /* Record the min/max values so that we can warn about bit-field
7285 enumerations that are too small for the values. */
7286 lt
= ggc_alloc_cleared_lang_type (sizeof (struct lang_type
));
7287 lt
->enum_min
= minnode
;
7288 lt
->enum_max
= maxnode
;
7289 TYPE_LANG_SPECIFIC (enumtype
) = lt
;
7291 /* Fix up all variant types of this enum type. */
7292 for (tem
= TYPE_MAIN_VARIANT (enumtype
); tem
; tem
= TYPE_NEXT_VARIANT (tem
))
7294 if (tem
== enumtype
)
7296 TYPE_VALUES (tem
) = TYPE_VALUES (enumtype
);
7297 TYPE_MIN_VALUE (tem
) = TYPE_MIN_VALUE (enumtype
);
7298 TYPE_MAX_VALUE (tem
) = TYPE_MAX_VALUE (enumtype
);
7299 TYPE_SIZE (tem
) = TYPE_SIZE (enumtype
);
7300 TYPE_SIZE_UNIT (tem
) = TYPE_SIZE_UNIT (enumtype
);
7301 SET_TYPE_MODE (tem
, TYPE_MODE (enumtype
));
7302 TYPE_PRECISION (tem
) = TYPE_PRECISION (enumtype
);
7303 TYPE_ALIGN (tem
) = TYPE_ALIGN (enumtype
);
7304 TYPE_USER_ALIGN (tem
) = TYPE_USER_ALIGN (enumtype
);
7305 TYPE_UNSIGNED (tem
) = TYPE_UNSIGNED (enumtype
);
7306 TYPE_LANG_SPECIFIC (tem
) = TYPE_LANG_SPECIFIC (enumtype
);
7309 /* Finish debugging output for this type. */
7310 rest_of_type_compilation (enumtype
, toplevel
);
7312 /* If this enum is defined inside a struct, add it to
7315 && struct_parse_info
!= NULL
7316 && !in_sizeof
&& !in_typeof
&& !in_alignof
)
7317 VEC_safe_push (tree
, heap
, struct_parse_info
->struct_types
, enumtype
);
7322 /* Build and install a CONST_DECL for one value of the
7323 current enumeration type (one that was begun with start_enum).
7324 LOC is the location of the enumerator.
7325 Return a tree-list containing the CONST_DECL and its value.
7326 Assignment of sequential values by default is handled here. */
7329 build_enumerator (location_t loc
,
7330 struct c_enum_contents
*the_enum
, tree name
, tree value
)
7334 /* Validate and default VALUE. */
7338 /* Don't issue more errors for error_mark_node (i.e. an
7339 undeclared identifier) - just ignore the value expression. */
7340 if (value
== error_mark_node
)
7342 else if (!INTEGRAL_TYPE_P (TREE_TYPE (value
)))
7344 error_at (loc
, "enumerator value for %qE is not an integer constant",
7350 if (TREE_CODE (value
) != INTEGER_CST
)
7352 value
= c_fully_fold (value
, false, NULL
);
7353 if (TREE_CODE (value
) == INTEGER_CST
)
7354 pedwarn (loc
, OPT_pedantic
,
7355 "enumerator value for %qE is not an integer "
7356 "constant expression", name
);
7358 if (TREE_CODE (value
) != INTEGER_CST
)
7360 error ("enumerator value for %qE is not an integer constant",
7366 value
= default_conversion (value
);
7367 constant_expression_warning (value
);
7372 /* Default based on previous value. */
7373 /* It should no longer be possible to have NON_LVALUE_EXPR
7377 value
= the_enum
->enum_next_value
;
7378 if (the_enum
->enum_overflow
)
7379 error_at (loc
, "overflow in enumeration values");
7381 /* Even though the underlying type of an enum is unspecified, the
7382 type of enumeration constants is explicitly defined as int
7383 (6.4.4.3/2 in the C99 Standard). GCC allows any integer type as
7385 else if (!int_fits_type_p (value
, integer_type_node
))
7386 pedwarn (loc
, OPT_pedantic
,
7387 "ISO C restricts enumerator values to range of %<int%>");
7389 /* The ISO C Standard mandates enumerators to have type int, even
7390 though the underlying type of an enum type is unspecified.
7391 However, GCC allows enumerators of any integer type as an
7392 extensions. Here we convert any enumerators that fit in an int
7393 to type int, to avoid promotions to unsigned types when comparing
7394 integers with enumerators that fit in the int range. When
7395 -pedantic is given, we would have already warned about those that
7396 don't fit. We have to do this here rather than in finish_enum
7397 because this value may be used to define more enumerators. */
7398 if (int_fits_type_p (value
, integer_type_node
))
7399 value
= convert (integer_type_node
, value
);
7401 /* Set basis for default for next value. */
7402 the_enum
->enum_next_value
7404 (EXPR_HAS_LOCATION (value
) ? EXPR_LOCATION (value
) : input_location
,
7405 PLUS_EXPR
, value
, integer_one_node
, 0);
7406 the_enum
->enum_overflow
= tree_int_cst_lt (the_enum
->enum_next_value
, value
);
7408 /* Now create a declaration for the enum value name. */
7410 type
= TREE_TYPE (value
);
7411 type
= c_common_type_for_size (MAX (TYPE_PRECISION (type
),
7412 TYPE_PRECISION (integer_type_node
)),
7413 (TYPE_PRECISION (type
)
7414 >= TYPE_PRECISION (integer_type_node
)
7415 && TYPE_UNSIGNED (type
)));
7417 decl
= build_decl (loc
, CONST_DECL
, name
, type
);
7418 DECL_INITIAL (decl
) = convert (type
, value
);
7421 return tree_cons (decl
, value
, NULL_TREE
);
7425 /* Create the FUNCTION_DECL for a function definition.
7426 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
7427 the declaration; they describe the function's name and the type it returns,
7428 but twisted together in a fashion that parallels the syntax of C.
7430 This function creates a binding context for the function body
7431 as well as setting up the FUNCTION_DECL in current_function_decl.
7433 Returns 1 on success. If the DECLARATOR is not suitable for a function
7434 (it defines a datum instead), we return 0, which tells
7435 yyparse to report a parse error. */
7438 start_function (struct c_declspecs
*declspecs
, struct c_declarator
*declarator
,
7441 tree decl1
, old_decl
;
7442 tree restype
, resdecl
;
7445 current_function_returns_value
= 0; /* Assume, until we see it does. */
7446 current_function_returns_null
= 0;
7447 current_function_returns_abnormally
= 0;
7448 warn_about_return_type
= 0;
7449 c_switch_stack
= NULL
;
7451 /* Indicate no valid break/continue context by setting these variables
7452 to some non-null, non-label value. We'll notice and emit the proper
7453 error message in c_finish_bc_stmt. */
7454 c_break_label
= c_cont_label
= size_zero_node
;
7456 decl1
= grokdeclarator (declarator
, declspecs
, FUNCDEF
, true, NULL
,
7457 &attributes
, NULL
, NULL
, DEPRECATED_NORMAL
);
7459 /* If the declarator is not suitable for a function definition,
7460 cause a syntax error. */
7464 loc
= DECL_SOURCE_LOCATION (decl1
);
7466 decl_attributes (&decl1
, attributes
, 0);
7468 if (DECL_DECLARED_INLINE_P (decl1
)
7469 && DECL_UNINLINABLE (decl1
)
7470 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1
)))
7471 warning_at (loc
, OPT_Wattributes
,
7472 "inline function %qD given attribute noinline",
7475 /* Handle gnu_inline attribute. */
7476 if (declspecs
->inline_p
7477 && !flag_gnu89_inline
7478 && TREE_CODE (decl1
) == FUNCTION_DECL
7479 && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl1
))
7480 || current_function_decl
))
7482 if (declspecs
->storage_class
!= csc_static
)
7483 DECL_EXTERNAL (decl1
) = !DECL_EXTERNAL (decl1
);
7486 announce_function (decl1
);
7488 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1
))))
7490 error_at (loc
, "return type is an incomplete type");
7491 /* Make it return void instead. */
7493 = build_function_type (void_type_node
,
7494 TYPE_ARG_TYPES (TREE_TYPE (decl1
)));
7497 if (warn_about_return_type
)
7498 pedwarn_c99 (loc
, flag_isoc99
? 0
7499 : (warn_return_type
? OPT_Wreturn_type
: OPT_Wimplicit_int
),
7500 "return type defaults to %<int%>");
7502 /* Make the init_value nonzero so pushdecl knows this is not tentative.
7503 error_mark_node is replaced below (in pop_scope) with the BLOCK. */
7504 DECL_INITIAL (decl1
) = error_mark_node
;
7506 /* A nested function is not global. */
7507 if (current_function_decl
!= 0)
7508 TREE_PUBLIC (decl1
) = 0;
7510 /* If this definition isn't a prototype and we had a prototype declaration
7511 before, copy the arg type info from that prototype. */
7512 old_decl
= lookup_name_in_scope (DECL_NAME (decl1
), current_scope
);
7513 if (old_decl
&& TREE_CODE (old_decl
) != FUNCTION_DECL
)
7515 current_function_prototype_locus
= UNKNOWN_LOCATION
;
7516 current_function_prototype_built_in
= false;
7517 current_function_prototype_arg_types
= NULL_TREE
;
7518 if (TYPE_ARG_TYPES (TREE_TYPE (decl1
)) == 0)
7520 if (old_decl
!= 0 && TREE_CODE (TREE_TYPE (old_decl
)) == FUNCTION_TYPE
7521 && comptypes (TREE_TYPE (TREE_TYPE (decl1
)),
7522 TREE_TYPE (TREE_TYPE (old_decl
))))
7524 TREE_TYPE (decl1
) = composite_type (TREE_TYPE (old_decl
),
7526 current_function_prototype_locus
= DECL_SOURCE_LOCATION (old_decl
);
7527 current_function_prototype_built_in
7528 = C_DECL_BUILTIN_PROTOTYPE (old_decl
);
7529 current_function_prototype_arg_types
7530 = TYPE_ARG_TYPES (TREE_TYPE (decl1
));
7532 if (TREE_PUBLIC (decl1
))
7534 /* If there is an external prototype declaration of this
7535 function, record its location but do not copy information
7536 to this decl. This may be an invisible declaration
7537 (built-in or in a scope which has finished) or simply
7538 have more refined argument types than any declaration
7540 struct c_binding
*b
;
7541 for (b
= I_SYMBOL_BINDING (DECL_NAME (decl1
)); b
; b
= b
->shadowed
)
7542 if (B_IN_SCOPE (b
, external_scope
))
7546 tree ext_decl
, ext_type
;
7548 ext_type
= b
->u
.type
? b
->u
.type
: TREE_TYPE (ext_decl
);
7549 if (TREE_CODE (ext_type
) == FUNCTION_TYPE
7550 && comptypes (TREE_TYPE (TREE_TYPE (decl1
)),
7551 TREE_TYPE (ext_type
)))
7553 current_function_prototype_locus
7554 = DECL_SOURCE_LOCATION (ext_decl
);
7555 current_function_prototype_built_in
7556 = C_DECL_BUILTIN_PROTOTYPE (ext_decl
);
7557 current_function_prototype_arg_types
7558 = TYPE_ARG_TYPES (ext_type
);
7564 /* Optionally warn of old-fashioned def with no previous prototype. */
7565 if (warn_strict_prototypes
7566 && old_decl
!= error_mark_node
7567 && TYPE_ARG_TYPES (TREE_TYPE (decl1
)) == 0
7568 && C_DECL_ISNT_PROTOTYPE (old_decl
))
7569 warning_at (loc
, OPT_Wstrict_prototypes
,
7570 "function declaration isn%'t a prototype");
7571 /* Optionally warn of any global def with no previous prototype. */
7572 else if (warn_missing_prototypes
7573 && old_decl
!= error_mark_node
7574 && TREE_PUBLIC (decl1
)
7575 && !MAIN_NAME_P (DECL_NAME (decl1
))
7576 && C_DECL_ISNT_PROTOTYPE (old_decl
))
7577 warning_at (loc
, OPT_Wmissing_prototypes
,
7578 "no previous prototype for %qD", decl1
);
7579 /* Optionally warn of any def with no previous prototype
7580 if the function has already been used. */
7581 else if (warn_missing_prototypes
7583 && old_decl
!= error_mark_node
7584 && TREE_USED (old_decl
)
7585 && TYPE_ARG_TYPES (TREE_TYPE (old_decl
)) == 0)
7586 warning_at (loc
, OPT_Wmissing_prototypes
,
7587 "%qD was used with no prototype before its definition", decl1
);
7588 /* Optionally warn of any global def with no previous declaration. */
7589 else if (warn_missing_declarations
7590 && TREE_PUBLIC (decl1
)
7592 && !MAIN_NAME_P (DECL_NAME (decl1
)))
7593 warning_at (loc
, OPT_Wmissing_declarations
,
7594 "no previous declaration for %qD",
7596 /* Optionally warn of any def with no previous declaration
7597 if the function has already been used. */
7598 else if (warn_missing_declarations
7600 && old_decl
!= error_mark_node
7601 && TREE_USED (old_decl
)
7602 && C_DECL_IMPLICIT (old_decl
))
7603 warning_at (loc
, OPT_Wmissing_declarations
,
7604 "%qD was used with no declaration before its definition", decl1
);
7606 /* This function exists in static storage.
7607 (This does not mean `static' in the C sense!) */
7608 TREE_STATIC (decl1
) = 1;
7610 /* This is the earliest point at which we might know the assembler
7611 name of the function. Thus, if it's set before this, die horribly. */
7612 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl1
));
7614 /* If #pragma weak was used, mark the decl weak now. */
7615 if (current_scope
== file_scope
)
7616 maybe_apply_pragma_weak (decl1
);
7618 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
7619 if (warn_main
&& MAIN_NAME_P (DECL_NAME (decl1
)))
7621 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1
)))
7622 != integer_type_node
)
7623 pedwarn (loc
, OPT_Wmain
, "return type of %qD is not %<int%>", decl1
);
7625 check_main_parameter_types (decl1
);
7627 if (!TREE_PUBLIC (decl1
))
7628 pedwarn (loc
, OPT_Wmain
,
7629 "%qD is normally a non-static function", decl1
);
7632 /* Record the decl so that the function name is defined.
7633 If we already have a decl for this name, and it is a FUNCTION_DECL,
7634 use the old decl. */
7636 current_function_decl
= pushdecl (decl1
);
7639 declare_parm_level ();
7641 restype
= TREE_TYPE (TREE_TYPE (current_function_decl
));
7642 resdecl
= build_decl (loc
, RESULT_DECL
, NULL_TREE
, restype
);
7643 DECL_ARTIFICIAL (resdecl
) = 1;
7644 DECL_IGNORED_P (resdecl
) = 1;
7645 DECL_RESULT (current_function_decl
) = resdecl
;
7647 start_fname_decls ();
7652 /* Subroutine of store_parm_decls which handles new-style function
7653 definitions (prototype format). The parms already have decls, so we
7654 need only record them as in effect and complain if any redundant
7655 old-style parm decls were written. */
7657 store_parm_decls_newstyle (tree fndecl
, const struct c_arg_info
*arg_info
)
7663 if (current_scope
->bindings
)
7665 error_at (DECL_SOURCE_LOCATION (fndecl
),
7666 "old-style parameter declarations in prototyped "
7667 "function definition");
7669 /* Get rid of the old-style declarations. */
7673 /* Don't issue this warning for nested functions, and don't issue this
7674 warning if we got here because ARG_INFO_TYPES was error_mark_node
7675 (this happens when a function definition has just an ellipsis in
7676 its parameter list). */
7677 else if (!in_system_header
&& !current_function_scope
7678 && arg_info
->types
!= error_mark_node
)
7679 warning_at (DECL_SOURCE_LOCATION (fndecl
), OPT_Wtraditional
,
7680 "traditional C rejects ISO C style function definitions");
7682 /* Now make all the parameter declarations visible in the function body.
7683 We can bypass most of the grunt work of pushdecl. */
7684 for (decl
= arg_info
->parms
; decl
; decl
= DECL_CHAIN (decl
))
7686 DECL_CONTEXT (decl
) = current_function_decl
;
7687 if (DECL_NAME (decl
))
7689 bind (DECL_NAME (decl
), decl
, current_scope
,
7690 /*invisible=*/false, /*nested=*/false,
7692 if (!TREE_USED (decl
))
7693 warn_if_shadowing (decl
);
7696 error_at (DECL_SOURCE_LOCATION (decl
), "parameter name omitted");
7699 /* Record the parameter list in the function declaration. */
7700 DECL_ARGUMENTS (fndecl
) = arg_info
->parms
;
7702 /* Now make all the ancillary declarations visible, likewise. */
7703 for (decl
= arg_info
->others
; decl
; decl
= DECL_CHAIN (decl
))
7705 DECL_CONTEXT (decl
) = current_function_decl
;
7706 if (DECL_NAME (decl
))
7707 bind (DECL_NAME (decl
), decl
, current_scope
,
7708 /*invisible=*/false,
7709 /*nested=*/(TREE_CODE (decl
) == FUNCTION_DECL
),
7713 /* And all the tag declarations. */
7714 FOR_EACH_VEC_ELT_REVERSE (c_arg_tag
, arg_info
->tags
, ix
, tag
)
7716 bind (tag
->id
, tag
->type
, current_scope
,
7717 /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION
);
7720 /* Subroutine of store_parm_decls which handles old-style function
7721 definitions (separate parameter list and declarations). */
7724 store_parm_decls_oldstyle (tree fndecl
, const struct c_arg_info
*arg_info
)
7726 struct c_binding
*b
;
7727 tree parm
, decl
, last
;
7728 tree parmids
= arg_info
->parms
;
7729 struct pointer_set_t
*seen_args
= pointer_set_create ();
7731 if (!in_system_header
)
7732 warning_at (DECL_SOURCE_LOCATION (fndecl
),
7733 OPT_Wold_style_definition
, "old-style function definition");
7735 /* Match each formal parameter name with its declaration. Save each
7736 decl in the appropriate TREE_PURPOSE slot of the parmids chain. */
7737 for (parm
= parmids
; parm
; parm
= TREE_CHAIN (parm
))
7739 if (TREE_VALUE (parm
) == 0)
7741 error_at (DECL_SOURCE_LOCATION (fndecl
),
7742 "parameter name missing from parameter list");
7743 TREE_PURPOSE (parm
) = 0;
7747 b
= I_SYMBOL_BINDING (TREE_VALUE (parm
));
7748 if (b
&& B_IN_CURRENT_SCOPE (b
))
7751 /* If we got something other than a PARM_DECL it is an error. */
7752 if (TREE_CODE (decl
) != PARM_DECL
)
7753 error_at (DECL_SOURCE_LOCATION (decl
),
7754 "%qD declared as a non-parameter", decl
);
7755 /* If the declaration is already marked, we have a duplicate
7756 name. Complain and ignore the duplicate. */
7757 else if (pointer_set_contains (seen_args
, decl
))
7759 error_at (DECL_SOURCE_LOCATION (decl
),
7760 "multiple parameters named %qD", decl
);
7761 TREE_PURPOSE (parm
) = 0;
7764 /* If the declaration says "void", complain and turn it into
7766 else if (VOID_TYPE_P (TREE_TYPE (decl
)))
7768 error_at (DECL_SOURCE_LOCATION (decl
),
7769 "parameter %qD declared with void type", decl
);
7770 TREE_TYPE (decl
) = integer_type_node
;
7771 DECL_ARG_TYPE (decl
) = integer_type_node
;
7772 layout_decl (decl
, 0);
7774 warn_if_shadowing (decl
);
7776 /* If no declaration found, default to int. */
7779 /* FIXME diagnostics: This should be the location of the argument,
7780 not the FNDECL. E.g., for an old-style declaration
7782 int f10(v) { blah; }
7784 We should use the location of the V, not the F10.
7785 Unfortunately, the V is an IDENTIFIER_NODE which has no
7786 location. In the future we need locations for c_arg_info
7789 See gcc.dg/Wshadow-3.c for an example of this problem. */
7790 decl
= build_decl (DECL_SOURCE_LOCATION (fndecl
),
7791 PARM_DECL
, TREE_VALUE (parm
), integer_type_node
);
7792 DECL_ARG_TYPE (decl
) = TREE_TYPE (decl
);
7794 warn_if_shadowing (decl
);
7797 pedwarn (DECL_SOURCE_LOCATION (decl
),
7798 0, "type of %qD defaults to %<int%>", decl
);
7800 warning_at (DECL_SOURCE_LOCATION (decl
),
7801 OPT_Wmissing_parameter_type
,
7802 "type of %qD defaults to %<int%>", decl
);
7805 TREE_PURPOSE (parm
) = decl
;
7806 pointer_set_insert (seen_args
, decl
);
7809 /* Now examine the parms chain for incomplete declarations
7810 and declarations with no corresponding names. */
7812 for (b
= current_scope
->bindings
; b
; b
= b
->prev
)
7815 if (TREE_CODE (parm
) != PARM_DECL
)
7818 if (TREE_TYPE (parm
) != error_mark_node
7819 && !COMPLETE_TYPE_P (TREE_TYPE (parm
)))
7821 error_at (DECL_SOURCE_LOCATION (parm
),
7822 "parameter %qD has incomplete type", parm
);
7823 TREE_TYPE (parm
) = error_mark_node
;
7826 if (!pointer_set_contains (seen_args
, parm
))
7828 error_at (DECL_SOURCE_LOCATION (parm
),
7829 "declaration for parameter %qD but no such parameter",
7832 /* Pretend the parameter was not missing.
7833 This gets us to a standard state and minimizes
7834 further error messages. */
7835 parmids
= chainon (parmids
, tree_cons (parm
, 0, 0));
7839 /* Chain the declarations together in the order of the list of
7840 names. Store that chain in the function decl, replacing the
7841 list of names. Update the current scope to match. */
7842 DECL_ARGUMENTS (fndecl
) = 0;
7844 for (parm
= parmids
; parm
; parm
= TREE_CHAIN (parm
))
7845 if (TREE_PURPOSE (parm
))
7847 if (parm
&& TREE_PURPOSE (parm
))
7849 last
= TREE_PURPOSE (parm
);
7850 DECL_ARGUMENTS (fndecl
) = last
;
7852 for (parm
= TREE_CHAIN (parm
); parm
; parm
= TREE_CHAIN (parm
))
7853 if (TREE_PURPOSE (parm
))
7855 DECL_CHAIN (last
) = TREE_PURPOSE (parm
);
7856 last
= TREE_PURPOSE (parm
);
7858 DECL_CHAIN (last
) = 0;
7861 pointer_set_destroy (seen_args
);
7863 /* If there was a previous prototype,
7864 set the DECL_ARG_TYPE of each argument according to
7865 the type previously specified, and report any mismatches. */
7867 if (current_function_prototype_arg_types
)
7870 for (parm
= DECL_ARGUMENTS (fndecl
),
7871 type
= current_function_prototype_arg_types
;
7872 parm
|| (type
&& TREE_VALUE (type
) != error_mark_node
7873 && (TYPE_MAIN_VARIANT (TREE_VALUE (type
)) != void_type_node
));
7874 parm
= DECL_CHAIN (parm
), type
= TREE_CHAIN (type
))
7876 if (parm
== 0 || type
== 0
7877 || TYPE_MAIN_VARIANT (TREE_VALUE (type
)) == void_type_node
)
7879 if (current_function_prototype_built_in
)
7880 warning_at (DECL_SOURCE_LOCATION (fndecl
),
7881 0, "number of arguments doesn%'t match "
7882 "built-in prototype");
7885 /* FIXME diagnostics: This should be the location of
7886 FNDECL, but there is bug when a prototype is
7887 declared inside function context, but defined
7888 outside of it (e.g., gcc.dg/pr15698-2.c). In
7889 which case FNDECL gets the location of the
7890 prototype, not the definition. */
7891 error_at (input_location
,
7892 "number of arguments doesn%'t match prototype");
7894 error_at (current_function_prototype_locus
,
7895 "prototype declaration");
7899 /* Type for passing arg must be consistent with that
7900 declared for the arg. ISO C says we take the unqualified
7901 type for parameters declared with qualified type. */
7902 if (TREE_TYPE (parm
) != error_mark_node
7903 && TREE_TYPE (type
) != error_mark_node
7904 && !comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm
)),
7905 TYPE_MAIN_VARIANT (TREE_VALUE (type
))))
7907 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm
))
7908 == TYPE_MAIN_VARIANT (TREE_VALUE (type
)))
7910 /* Adjust argument to match prototype. E.g. a previous
7911 `int foo(float);' prototype causes
7912 `int foo(x) float x; {...}' to be treated like
7913 `int foo(float x) {...}'. This is particularly
7914 useful for argument types like uid_t. */
7915 DECL_ARG_TYPE (parm
) = TREE_TYPE (parm
);
7917 if (targetm
.calls
.promote_prototypes (TREE_TYPE (current_function_decl
))
7918 && INTEGRAL_TYPE_P (TREE_TYPE (parm
))
7919 && TYPE_PRECISION (TREE_TYPE (parm
))
7920 < TYPE_PRECISION (integer_type_node
))
7921 DECL_ARG_TYPE (parm
) = integer_type_node
;
7923 /* ??? Is it possible to get here with a
7924 built-in prototype or will it always have
7925 been diagnosed as conflicting with an
7926 old-style definition and discarded? */
7927 if (current_function_prototype_built_in
)
7928 warning_at (DECL_SOURCE_LOCATION (parm
),
7929 OPT_pedantic
, "promoted argument %qD "
7930 "doesn%'t match built-in prototype", parm
);
7933 pedwarn (DECL_SOURCE_LOCATION (parm
),
7934 OPT_pedantic
, "promoted argument %qD "
7935 "doesn%'t match prototype", parm
);
7936 pedwarn (current_function_prototype_locus
, OPT_pedantic
,
7937 "prototype declaration");
7942 if (current_function_prototype_built_in
)
7943 warning_at (DECL_SOURCE_LOCATION (parm
),
7944 0, "argument %qD doesn%'t match "
7945 "built-in prototype", parm
);
7948 error_at (DECL_SOURCE_LOCATION (parm
),
7949 "argument %qD doesn%'t match prototype", parm
);
7950 error_at (current_function_prototype_locus
,
7951 "prototype declaration");
7956 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl
)) = 0;
7959 /* Otherwise, create a prototype that would match. */
7963 tree actual
= 0, last
= 0, type
;
7965 for (parm
= DECL_ARGUMENTS (fndecl
); parm
; parm
= DECL_CHAIN (parm
))
7967 type
= tree_cons (NULL_TREE
, DECL_ARG_TYPE (parm
), NULL_TREE
);
7969 TREE_CHAIN (last
) = type
;
7974 type
= tree_cons (NULL_TREE
, void_type_node
, NULL_TREE
);
7976 TREE_CHAIN (last
) = type
;
7980 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
7981 of the type of this function, but we need to avoid having this
7982 affect the types of other similarly-typed functions, so we must
7983 first force the generation of an identical (but separate) type
7984 node for the relevant function type. The new node we create
7985 will be a variant of the main variant of the original function
7988 TREE_TYPE (fndecl
) = build_variant_type_copy (TREE_TYPE (fndecl
));
7990 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl
)) = actual
;
7994 /* Store parameter declarations passed in ARG_INFO into the current
7995 function declaration. */
7998 store_parm_decls_from (struct c_arg_info
*arg_info
)
8000 current_function_arg_info
= arg_info
;
8001 store_parm_decls ();
8004 /* Store the parameter declarations into the current function declaration.
8005 This is called after parsing the parameter declarations, before
8006 digesting the body of the function.
8008 For an old-style definition, construct a prototype out of the old-style
8009 parameter declarations and inject it into the function's type. */
8012 store_parm_decls (void)
8014 tree fndecl
= current_function_decl
;
8017 /* The argument information block for FNDECL. */
8018 struct c_arg_info
*arg_info
= current_function_arg_info
;
8019 current_function_arg_info
= 0;
8021 /* True if this definition is written with a prototype. Note:
8022 despite C99 6.7.5.3p14, we can *not* treat an empty argument
8023 list in a function definition as equivalent to (void) -- an
8024 empty argument list specifies the function has no parameters,
8025 but only (void) sets up a prototype for future calls. */
8026 proto
= arg_info
->types
!= 0;
8029 store_parm_decls_newstyle (fndecl
, arg_info
);
8031 store_parm_decls_oldstyle (fndecl
, arg_info
);
8033 /* The next call to push_scope will be a function body. */
8035 next_is_function_body
= true;
8037 /* Write a record describing this function definition to the prototypes
8038 file (if requested). */
8040 gen_aux_info_record (fndecl
, 1, 0, proto
);
8042 /* Initialize the RTL code for the function. */
8043 allocate_struct_function (fndecl
, false);
8045 /* Begin the statement tree for this function. */
8046 DECL_SAVED_TREE (fndecl
) = push_stmt_list ();
8048 /* ??? Insert the contents of the pending sizes list into the function
8049 to be evaluated. The only reason left to have this is
8050 void foo(int n, int array[n++])
8051 because we throw away the array type in favor of a pointer type, and
8052 thus won't naturally see the SAVE_EXPR containing the increment. All
8053 other pending sizes would be handled by gimplify_parameters. */
8055 VEC(tree
,gc
) *pending_sizes
= get_pending_sizes ();
8059 for (i
= 0; VEC_iterate (tree
, pending_sizes
, i
, t
); i
++)
8063 /* Even though we're inside a function body, we still don't want to
8064 call expand_expr to calculate the size of a variable-sized array.
8065 We haven't necessarily assigned RTL to all variables yet, so it's
8066 not safe to try to expand expressions involving them. */
8067 cfun
->dont_save_pending_sizes_p
= 1;
8071 /* Finish up a function declaration and compile that function
8072 all the way to assembler language output. Then free the storage
8073 for the function definition.
8075 This is called after parsing the body of the function definition. */
8078 finish_function (void)
8080 tree fndecl
= current_function_decl
;
8082 if (TREE_CODE (fndecl
) == FUNCTION_DECL
8083 && targetm
.calls
.promote_prototypes (TREE_TYPE (fndecl
)))
8085 tree args
= DECL_ARGUMENTS (fndecl
);
8086 for (; args
; args
= DECL_CHAIN (args
))
8088 tree type
= TREE_TYPE (args
);
8089 if (INTEGRAL_TYPE_P (type
)
8090 && TYPE_PRECISION (type
) < TYPE_PRECISION (integer_type_node
))
8091 DECL_ARG_TYPE (args
) = integer_type_node
;
8095 if (DECL_INITIAL (fndecl
) && DECL_INITIAL (fndecl
) != error_mark_node
)
8096 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl
)) = fndecl
;
8098 /* Must mark the RESULT_DECL as being in this function. */
8100 if (DECL_RESULT (fndecl
) && DECL_RESULT (fndecl
) != error_mark_node
)
8101 DECL_CONTEXT (DECL_RESULT (fndecl
)) = fndecl
;
8103 if (MAIN_NAME_P (DECL_NAME (fndecl
)) && flag_hosted
8104 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl
)))
8105 == integer_type_node
&& flag_isoc99
)
8107 /* Hack. We don't want the middle-end to warn that this return
8108 is unreachable, so we mark its location as special. Using
8109 UNKNOWN_LOCATION has the problem that it gets clobbered in
8110 annotate_one_with_locus. A cleaner solution might be to
8111 ensure ! should_carry_locus_p (stmt), but that needs a flag.
8113 c_finish_return (BUILTINS_LOCATION
, integer_zero_node
, NULL_TREE
);
8116 /* Tie off the statement tree for this function. */
8117 DECL_SAVED_TREE (fndecl
) = pop_stmt_list (DECL_SAVED_TREE (fndecl
));
8119 finish_fname_decls ();
8121 /* Complain if there's just no return statement. */
8122 if (warn_return_type
8123 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl
))) != VOID_TYPE
8124 && !current_function_returns_value
&& !current_function_returns_null
8125 /* Don't complain if we are no-return. */
8126 && !current_function_returns_abnormally
8127 /* Don't complain if we are declared noreturn. */
8128 && !TREE_THIS_VOLATILE (fndecl
)
8129 /* Don't warn for main(). */
8130 && !MAIN_NAME_P (DECL_NAME (fndecl
))
8131 /* Or if they didn't actually specify a return type. */
8132 && !C_FUNCTION_IMPLICIT_INT (fndecl
)
8133 /* Normally, with -Wreturn-type, flow will complain, but we might
8134 optimize out static functions. */
8135 && !TREE_PUBLIC (fndecl
))
8137 warning (OPT_Wreturn_type
,
8138 "no return statement in function returning non-void");
8139 TREE_NO_WARNING (fndecl
) = 1;
8142 /* Complain about parameters that are only set, but never otherwise used. */
8143 if (warn_unused_but_set_parameter
)
8147 for (decl
= DECL_ARGUMENTS (fndecl
);
8149 decl
= DECL_CHAIN (decl
))
8150 if (TREE_USED (decl
)
8151 && TREE_CODE (decl
) == PARM_DECL
8152 && !DECL_READ_P (decl
)
8154 && !DECL_ARTIFICIAL (decl
)
8155 && !TREE_NO_WARNING (decl
))
8156 warning_at (DECL_SOURCE_LOCATION (decl
),
8157 OPT_Wunused_but_set_parameter
,
8158 "parameter %qD set but not used", decl
);
8161 /* Store the end of the function, so that we get good line number
8162 info for the epilogue. */
8163 cfun
->function_end_locus
= input_location
;
8165 /* Finalize the ELF visibility for the function. */
8166 c_determine_visibility (fndecl
);
8168 /* For GNU C extern inline functions disregard inline limits. */
8169 if (DECL_EXTERNAL (fndecl
)
8170 && DECL_DECLARED_INLINE_P (fndecl
))
8171 DECL_DISREGARD_INLINE_LIMITS (fndecl
) = 1;
8173 /* Genericize before inlining. Delay genericizing nested functions
8174 until their parent function is genericized. Since finalizing
8175 requires GENERIC, delay that as well. */
8177 if (DECL_INITIAL (fndecl
) && DECL_INITIAL (fndecl
) != error_mark_node
8178 && !undef_nested_function
)
8180 if (!decl_function_context (fndecl
))
8182 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE
, fndecl
);
8183 c_genericize (fndecl
);
8185 /* ??? Objc emits functions after finalizing the compilation unit.
8186 This should be cleaned up later and this conditional removed. */
8187 if (cgraph_global_info_ready
)
8189 cgraph_add_new_function (fndecl
, false);
8192 cgraph_finalize_function (fndecl
, false);
8196 /* Register this function with cgraph just far enough to get it
8197 added to our parent's nested function list. Handy, since the
8198 C front end doesn't have such a list. */
8199 (void) cgraph_node (fndecl
);
8203 if (!decl_function_context (fndecl
))
8204 undef_nested_function
= false;
8206 /* We're leaving the context of this function, so zap cfun.
8207 It's still in DECL_STRUCT_FUNCTION, and we'll restore it in
8208 tree_rest_of_compilation. */
8210 current_function_decl
= NULL
;
8213 /* Check the declarations given in a for-loop for satisfying the C99
8214 constraints. If exactly one such decl is found, return it. LOC is
8215 the location of the opening parenthesis of the for loop. */
8218 check_for_loop_decls (location_t loc
)
8220 struct c_binding
*b
;
8221 tree one_decl
= NULL_TREE
;
8226 static bool hint
= true;
8227 /* If we get here, declarations have been used in a for loop without
8228 the C99 for loop scope. This doesn't make much sense, so don't
8230 error_at (loc
, "%<for%> loop initial declarations "
8231 "are only allowed in C99 mode");
8235 "use option -std=c99 or -std=gnu99 to compile your code");
8240 /* C99 subclause 6.8.5 paragraph 3:
8242 [#3] The declaration part of a for statement shall only
8243 declare identifiers for objects having storage class auto or
8246 It isn't clear whether, in this sentence, "identifiers" binds to
8247 "shall only declare" or to "objects" - that is, whether all identifiers
8248 declared must be identifiers for objects, or whether the restriction
8249 only applies to those that are. (A question on this in comp.std.c
8250 in November 2000 received no answer.) We implement the strictest
8251 interpretation, to avoid creating an extension which later causes
8254 for (b
= current_scope
->bindings
; b
; b
= b
->prev
)
8257 tree decl
= b
->decl
;
8262 switch (TREE_CODE (decl
))
8266 location_t decl_loc
= DECL_SOURCE_LOCATION (decl
);
8267 if (TREE_STATIC (decl
))
8269 "declaration of static variable %qD in %<for%> loop "
8270 "initial declaration", decl
);
8271 else if (DECL_EXTERNAL (decl
))
8273 "declaration of %<extern%> variable %qD in %<for%> loop "
8274 "initial declaration", decl
);
8280 "%<struct %E%> declared in %<for%> loop initial "
8285 "%<union %E%> declared in %<for%> loop initial declaration",
8289 error_at (loc
, "%<enum %E%> declared in %<for%> loop "
8290 "initial declaration", id
);
8293 error_at (loc
, "declaration of non-variable "
8294 "%qD in %<for%> loop initial declaration", decl
);
8301 return n_decls
== 1 ? one_decl
: NULL_TREE
;
8304 /* Save and reinitialize the variables
8305 used during compilation of a C function. */
8308 c_push_function_context (void)
8310 struct language_function
*p
;
8311 p
= ggc_alloc_language_function ();
8314 p
->base
.x_stmt_tree
= c_stmt_tree
;
8315 p
->x_break_label
= c_break_label
;
8316 p
->x_cont_label
= c_cont_label
;
8317 p
->x_switch_stack
= c_switch_stack
;
8318 p
->arg_info
= current_function_arg_info
;
8319 p
->returns_value
= current_function_returns_value
;
8320 p
->returns_null
= current_function_returns_null
;
8321 p
->returns_abnormally
= current_function_returns_abnormally
;
8322 p
->warn_about_return_type
= warn_about_return_type
;
8324 push_function_context ();
8327 /* Restore the variables used during compilation of a C function. */
8330 c_pop_function_context (void)
8332 struct language_function
*p
;
8334 pop_function_context ();
8336 cfun
->language
= NULL
;
8338 if (DECL_STRUCT_FUNCTION (current_function_decl
) == 0
8339 && DECL_SAVED_TREE (current_function_decl
) == NULL_TREE
)
8341 /* Stop pointing to the local nodes about to be freed. */
8342 /* But DECL_INITIAL must remain nonzero so we know this
8343 was an actual function definition. */
8344 DECL_INITIAL (current_function_decl
) = error_mark_node
;
8345 DECL_ARGUMENTS (current_function_decl
) = 0;
8348 c_stmt_tree
= p
->base
.x_stmt_tree
;
8349 c_break_label
= p
->x_break_label
;
8350 c_cont_label
= p
->x_cont_label
;
8351 c_switch_stack
= p
->x_switch_stack
;
8352 current_function_arg_info
= p
->arg_info
;
8353 current_function_returns_value
= p
->returns_value
;
8354 current_function_returns_null
= p
->returns_null
;
8355 current_function_returns_abnormally
= p
->returns_abnormally
;
8356 warn_about_return_type
= p
->warn_about_return_type
;
8359 /* The functions below are required for functionality of doing
8360 function at once processing in the C front end. Currently these
8361 functions are not called from anywhere in the C front end, but as
8362 these changes continue, that will change. */
8364 /* Returns the stmt_tree (if any) to which statements are currently
8365 being added. If there is no active statement-tree, NULL is
8369 current_stmt_tree (void)
8371 return &c_stmt_tree
;
8374 /* Return the global value of T as a symbol. */
8377 identifier_global_value (tree t
)
8379 struct c_binding
*b
;
8381 for (b
= I_SYMBOL_BINDING (t
); b
; b
= b
->shadowed
)
8382 if (B_IN_FILE_SCOPE (b
) || B_IN_EXTERNAL_SCOPE (b
))
8388 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
8389 otherwise the name is found in ridpointers from RID_INDEX. */
8392 record_builtin_type (enum rid rid_index
, const char *name
, tree type
)
8396 id
= ridpointers
[(int) rid_index
];
8398 id
= get_identifier (name
);
8399 decl
= build_decl (UNKNOWN_LOCATION
, TYPE_DECL
, id
, type
);
8401 if (debug_hooks
->type_decl
)
8402 debug_hooks
->type_decl (decl
, false);
8405 /* Build the void_list_node (void_type_node having been created). */
8407 build_void_list_node (void)
8409 tree t
= build_tree_list (NULL_TREE
, void_type_node
);
8413 /* Return a c_parm structure with the given SPECS, ATTRS and DECLARATOR. */
8416 build_c_parm (struct c_declspecs
*specs
, tree attrs
,
8417 struct c_declarator
*declarator
)
8419 struct c_parm
*ret
= XOBNEW (&parser_obstack
, struct c_parm
);
8422 ret
->declarator
= declarator
;
8426 /* Return a declarator with nested attributes. TARGET is the inner
8427 declarator to which these attributes apply. ATTRS are the
8430 struct c_declarator
*
8431 build_attrs_declarator (tree attrs
, struct c_declarator
*target
)
8433 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
8434 ret
->kind
= cdk_attrs
;
8435 ret
->declarator
= target
;
8436 ret
->u
.attrs
= attrs
;
8440 /* Return a declarator for a function with arguments specified by ARGS
8441 and return type specified by TARGET. */
8443 struct c_declarator
*
8444 build_function_declarator (struct c_arg_info
*args
,
8445 struct c_declarator
*target
)
8447 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
8448 ret
->kind
= cdk_function
;
8449 ret
->declarator
= target
;
8450 ret
->u
.arg_info
= args
;
8454 /* Return a declarator for the identifier IDENT (which may be
8455 NULL_TREE for an abstract declarator). */
8457 struct c_declarator
*
8458 build_id_declarator (tree ident
)
8460 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
8462 ret
->declarator
= 0;
8464 /* Default value - may get reset to a more precise location. */
8465 ret
->id_loc
= input_location
;
8469 /* Return something to represent absolute declarators containing a *.
8470 TARGET is the absolute declarator that the * contains.
8471 TYPE_QUALS_ATTRS is a structure for type qualifiers and attributes
8472 to apply to the pointer type. */
8474 struct c_declarator
*
8475 make_pointer_declarator (struct c_declspecs
*type_quals_attrs
,
8476 struct c_declarator
*target
)
8480 struct c_declarator
*itarget
= target
;
8481 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
8482 if (type_quals_attrs
)
8484 attrs
= type_quals_attrs
->attrs
;
8485 quals
= quals_from_declspecs (type_quals_attrs
);
8486 if (attrs
!= NULL_TREE
)
8487 itarget
= build_attrs_declarator (attrs
, target
);
8489 ret
->kind
= cdk_pointer
;
8490 ret
->declarator
= itarget
;
8491 ret
->u
.pointer_quals
= quals
;
8495 /* Return a pointer to a structure for an empty list of declaration
8498 struct c_declspecs
*
8499 build_null_declspecs (void)
8501 struct c_declspecs
*ret
= XOBNEW (&parser_obstack
, struct c_declspecs
);
8506 ret
->typespec_word
= cts_none
;
8507 ret
->storage_class
= csc_none
;
8508 ret
->expr_const_operands
= true;
8509 ret
->declspecs_seen_p
= false;
8510 ret
->type_seen_p
= false;
8511 ret
->non_sc_seen_p
= false;
8512 ret
->typedef_p
= false;
8513 ret
->tag_defined_p
= false;
8514 ret
->explicit_signed_p
= false;
8515 ret
->deprecated_p
= false;
8516 ret
->default_int_p
= false;
8517 ret
->long_p
= false;
8518 ret
->long_long_p
= false;
8519 ret
->short_p
= false;
8520 ret
->signed_p
= false;
8521 ret
->unsigned_p
= false;
8522 ret
->complex_p
= false;
8523 ret
->inline_p
= false;
8524 ret
->thread_p
= false;
8525 ret
->const_p
= false;
8526 ret
->volatile_p
= false;
8527 ret
->restrict_p
= false;
8528 ret
->saturating_p
= false;
8529 ret
->address_space
= ADDR_SPACE_GENERIC
;
8533 /* Add the address space ADDRSPACE to the declaration specifiers
8534 SPECS, returning SPECS. */
8536 struct c_declspecs
*
8537 declspecs_add_addrspace (struct c_declspecs
*specs
, addr_space_t as
)
8539 specs
->non_sc_seen_p
= true;
8540 specs
->declspecs_seen_p
= true;
8542 if (!ADDR_SPACE_GENERIC_P (specs
->address_space
)
8543 && specs
->address_space
!= as
)
8544 error ("incompatible address space qualifiers %qs and %qs",
8545 c_addr_space_name (as
),
8546 c_addr_space_name (specs
->address_space
));
8548 specs
->address_space
= as
;
8552 /* Add the type qualifier QUAL to the declaration specifiers SPECS,
8555 struct c_declspecs
*
8556 declspecs_add_qual (struct c_declspecs
*specs
, tree qual
)
8560 specs
->non_sc_seen_p
= true;
8561 specs
->declspecs_seen_p
= true;
8562 gcc_assert (TREE_CODE (qual
) == IDENTIFIER_NODE
8563 && C_IS_RESERVED_WORD (qual
));
8564 i
= C_RID_CODE (qual
);
8568 dupe
= specs
->const_p
;
8569 specs
->const_p
= true;
8572 dupe
= specs
->volatile_p
;
8573 specs
->volatile_p
= true;
8576 dupe
= specs
->restrict_p
;
8577 specs
->restrict_p
= true;
8582 if (dupe
&& !flag_isoc99
)
8583 pedwarn (input_location
, OPT_pedantic
, "duplicate %qE", qual
);
8587 /* Add the type specifier TYPE to the declaration specifiers SPECS,
8590 struct c_declspecs
*
8591 declspecs_add_type (location_t loc
, struct c_declspecs
*specs
,
8592 struct c_typespec spec
)
8594 tree type
= spec
.spec
;
8595 specs
->non_sc_seen_p
= true;
8596 specs
->declspecs_seen_p
= true;
8597 specs
->type_seen_p
= true;
8598 if (TREE_DEPRECATED (type
))
8599 specs
->deprecated_p
= true;
8601 /* Handle type specifier keywords. */
8602 if (TREE_CODE (type
) == IDENTIFIER_NODE
8603 && C_IS_RESERVED_WORD (type
)
8604 && C_RID_CODE (type
) != RID_CXX_COMPAT_WARN
)
8606 enum rid i
= C_RID_CODE (type
);
8609 error_at (loc
, "two or more data types in declaration specifiers");
8612 if ((int) i
<= (int) RID_LAST_MODIFIER
)
8614 /* "long", "short", "signed", "unsigned", "_Complex" or "_Sat". */
8619 if (specs
->long_long_p
)
8621 error_at (loc
, "%<long long long%> is too long for GCC");
8626 if (specs
->typespec_word
== cts_double
)
8629 ("both %<long long%> and %<double%> in "
8630 "declaration specifiers"));
8633 pedwarn_c90 (loc
, OPT_Wlong_long
,
8634 "ISO C90 does not support %<long long%>");
8635 specs
->long_long_p
= 1;
8640 ("both %<long%> and %<short%> in "
8641 "declaration specifiers"));
8642 else if (specs
->typespec_word
== cts_void
)
8644 ("both %<long%> and %<void%> in "
8645 "declaration specifiers"));
8646 else if (specs
->typespec_word
== cts_int128
)
8648 ("both %<long%> and %<__int128%> in "
8649 "declaration specifiers"));
8650 else if (specs
->typespec_word
== cts_bool
)
8652 ("both %<long%> and %<_Bool%> in "
8653 "declaration specifiers"));
8654 else if (specs
->typespec_word
== cts_char
)
8656 ("both %<long%> and %<char%> in "
8657 "declaration specifiers"));
8658 else if (specs
->typespec_word
== cts_float
)
8660 ("both %<long%> and %<float%> in "
8661 "declaration specifiers"));
8662 else if (specs
->typespec_word
== cts_dfloat32
)
8664 ("both %<long%> and %<_Decimal32%> in "
8665 "declaration specifiers"));
8666 else if (specs
->typespec_word
== cts_dfloat64
)
8668 ("both %<long%> and %<_Decimal64%> in "
8669 "declaration specifiers"));
8670 else if (specs
->typespec_word
== cts_dfloat128
)
8672 ("both %<long%> and %<_Decimal128%> in "
8673 "declaration specifiers"));
8675 specs
->long_p
= true;
8678 dupe
= specs
->short_p
;
8681 ("both %<long%> and %<short%> in "
8682 "declaration specifiers"));
8683 else if (specs
->typespec_word
== cts_void
)
8685 ("both %<short%> and %<void%> in "
8686 "declaration specifiers"));
8687 else if (specs
->typespec_word
== cts_int128
)
8689 ("both %<short%> and %<__int128%> in "
8690 "declaration specifiers"));
8691 else if (specs
->typespec_word
== cts_bool
)
8693 ("both %<short%> and %<_Bool%> in "
8694 "declaration specifiers"));
8695 else if (specs
->typespec_word
== cts_char
)
8697 ("both %<short%> and %<char%> in "
8698 "declaration specifiers"));
8699 else if (specs
->typespec_word
== cts_float
)
8701 ("both %<short%> and %<float%> in "
8702 "declaration specifiers"));
8703 else if (specs
->typespec_word
== cts_double
)
8705 ("both %<short%> and %<double%> in "
8706 "declaration specifiers"));
8707 else if (specs
->typespec_word
== cts_dfloat32
)
8709 ("both %<short%> and %<_Decimal32%> in "
8710 "declaration specifiers"));
8711 else if (specs
->typespec_word
== cts_dfloat64
)
8713 ("both %<short%> and %<_Decimal64%> in "
8714 "declaration specifiers"));
8715 else if (specs
->typespec_word
== cts_dfloat128
)
8717 ("both %<short%> and %<_Decimal128%> in "
8718 "declaration specifiers"));
8720 specs
->short_p
= true;
8723 dupe
= specs
->signed_p
;
8724 if (specs
->unsigned_p
)
8726 ("both %<signed%> and %<unsigned%> in "
8727 "declaration specifiers"));
8728 else if (specs
->typespec_word
== cts_void
)
8730 ("both %<signed%> and %<void%> in "
8731 "declaration specifiers"));
8732 else if (specs
->typespec_word
== cts_bool
)
8734 ("both %<signed%> and %<_Bool%> in "
8735 "declaration specifiers"));
8736 else if (specs
->typespec_word
== cts_float
)
8738 ("both %<signed%> and %<float%> in "
8739 "declaration specifiers"));
8740 else if (specs
->typespec_word
== cts_double
)
8742 ("both %<signed%> and %<double%> in "
8743 "declaration specifiers"));
8744 else if (specs
->typespec_word
== cts_dfloat32
)
8746 ("both %<signed%> and %<_Decimal32%> in "
8747 "declaration specifiers"));
8748 else if (specs
->typespec_word
== cts_dfloat64
)
8750 ("both %<signed%> and %<_Decimal64%> in "
8751 "declaration specifiers"));
8752 else if (specs
->typespec_word
== cts_dfloat128
)
8754 ("both %<signed%> and %<_Decimal128%> in "
8755 "declaration specifiers"));
8757 specs
->signed_p
= true;
8760 dupe
= specs
->unsigned_p
;
8761 if (specs
->signed_p
)
8763 ("both %<signed%> and %<unsigned%> in "
8764 "declaration specifiers"));
8765 else if (specs
->typespec_word
== cts_void
)
8767 ("both %<unsigned%> and %<void%> in "
8768 "declaration specifiers"));
8769 else if (specs
->typespec_word
== cts_bool
)
8771 ("both %<unsigned%> and %<_Bool%> in "
8772 "declaration specifiers"));
8773 else if (specs
->typespec_word
== cts_float
)
8775 ("both %<unsigned%> and %<float%> in "
8776 "declaration specifiers"));
8777 else if (specs
->typespec_word
== cts_double
)
8779 ("both %<unsigned%> and %<double%> in "
8780 "declaration specifiers"));
8781 else if (specs
->typespec_word
== cts_dfloat32
)
8783 ("both %<unsigned%> and %<_Decimal32%> in "
8784 "declaration specifiers"));
8785 else if (specs
->typespec_word
== cts_dfloat64
)
8787 ("both %<unsigned%> and %<_Decimal64%> in "
8788 "declaration specifiers"));
8789 else if (specs
->typespec_word
== cts_dfloat128
)
8791 ("both %<unsigned%> and %<_Decimal128%> in "
8792 "declaration specifiers"));
8794 specs
->unsigned_p
= true;
8797 dupe
= specs
->complex_p
;
8798 if (!flag_isoc99
&& !in_system_header
)
8799 pedwarn (loc
, OPT_pedantic
,
8800 "ISO C90 does not support complex types");
8801 if (specs
->typespec_word
== cts_void
)
8803 ("both %<complex%> and %<void%> in "
8804 "declaration specifiers"));
8805 else if (specs
->typespec_word
== cts_bool
)
8807 ("both %<complex%> and %<_Bool%> in "
8808 "declaration specifiers"));
8809 else if (specs
->typespec_word
== cts_dfloat32
)
8811 ("both %<complex%> and %<_Decimal32%> in "
8812 "declaration specifiers"));
8813 else if (specs
->typespec_word
== cts_dfloat64
)
8815 ("both %<complex%> and %<_Decimal64%> in "
8816 "declaration specifiers"));
8817 else if (specs
->typespec_word
== cts_dfloat128
)
8819 ("both %<complex%> and %<_Decimal128%> in "
8820 "declaration specifiers"));
8821 else if (specs
->typespec_word
== cts_fract
)
8823 ("both %<complex%> and %<_Fract%> in "
8824 "declaration specifiers"));
8825 else if (specs
->typespec_word
== cts_accum
)
8827 ("both %<complex%> and %<_Accum%> in "
8828 "declaration specifiers"));
8829 else if (specs
->saturating_p
)
8831 ("both %<complex%> and %<_Sat%> in "
8832 "declaration specifiers"));
8834 specs
->complex_p
= true;
8837 dupe
= specs
->saturating_p
;
8838 pedwarn (loc
, OPT_pedantic
,
8839 "ISO C does not support saturating types");
8840 if (specs
->typespec_word
== cts_int128
)
8843 ("both %<_Sat%> and %<__int128%> in "
8844 "declaration specifiers"));
8846 else if (specs
->typespec_word
== cts_void
)
8848 ("both %<_Sat%> and %<void%> in "
8849 "declaration specifiers"));
8850 else if (specs
->typespec_word
== cts_bool
)
8852 ("both %<_Sat%> and %<_Bool%> in "
8853 "declaration specifiers"));
8854 else if (specs
->typespec_word
== cts_char
)
8856 ("both %<_Sat%> and %<char%> in "
8857 "declaration specifiers"));
8858 else if (specs
->typespec_word
== cts_int
)
8860 ("both %<_Sat%> and %<int%> in "
8861 "declaration specifiers"));
8862 else if (specs
->typespec_word
== cts_float
)
8864 ("both %<_Sat%> and %<float%> in "
8865 "declaration specifiers"));
8866 else if (specs
->typespec_word
== cts_double
)
8868 ("both %<_Sat%> and %<double%> in "
8869 "declaration specifiers"));
8870 else if (specs
->typespec_word
== cts_dfloat32
)
8872 ("both %<_Sat%> and %<_Decimal32%> in "
8873 "declaration specifiers"));
8874 else if (specs
->typespec_word
== cts_dfloat64
)
8876 ("both %<_Sat%> and %<_Decimal64%> in "
8877 "declaration specifiers"));
8878 else if (specs
->typespec_word
== cts_dfloat128
)
8880 ("both %<_Sat%> and %<_Decimal128%> in "
8881 "declaration specifiers"));
8882 else if (specs
->complex_p
)
8884 ("both %<_Sat%> and %<complex%> in "
8885 "declaration specifiers"));
8887 specs
->saturating_p
= true;
8894 error_at (loc
, "duplicate %qE", type
);
8900 /* "void", "_Bool", "char", "int", "float", "double", "_Decimal32",
8901 "__int128", "_Decimal64", "_Decimal128", "_Fract" or "_Accum". */
8902 if (specs
->typespec_word
!= cts_none
)
8905 "two or more data types in declaration specifiers");
8911 if (int128_integer_type_node
== NULL_TREE
)
8913 error_at (loc
, "%<__int128%> is not supported for this target");
8916 if (!in_system_header
)
8917 pedwarn (loc
, OPT_pedantic
,
8918 "ISO C does not support %<__int128%> type");
8922 ("both %<__int128%> and %<long%> in "
8923 "declaration specifiers"));
8924 else if (specs
->saturating_p
)
8926 ("both %<_Sat%> and %<__int128%> in "
8927 "declaration specifiers"));
8928 else if (specs
->short_p
)
8930 ("both %<__int128%> and %<short%> in "
8931 "declaration specifiers"));
8933 specs
->typespec_word
= cts_int128
;
8938 ("both %<long%> and %<void%> in "
8939 "declaration specifiers"));
8940 else if (specs
->short_p
)
8942 ("both %<short%> and %<void%> in "
8943 "declaration specifiers"));
8944 else if (specs
->signed_p
)
8946 ("both %<signed%> and %<void%> in "
8947 "declaration specifiers"));
8948 else if (specs
->unsigned_p
)
8950 ("both %<unsigned%> and %<void%> in "
8951 "declaration specifiers"));
8952 else if (specs
->complex_p
)
8954 ("both %<complex%> and %<void%> in "
8955 "declaration specifiers"));
8956 else if (specs
->saturating_p
)
8958 ("both %<_Sat%> and %<void%> in "
8959 "declaration specifiers"));
8961 specs
->typespec_word
= cts_void
;
8966 ("both %<long%> and %<_Bool%> in "
8967 "declaration specifiers"));
8968 else if (specs
->short_p
)
8970 ("both %<short%> and %<_Bool%> in "
8971 "declaration specifiers"));
8972 else if (specs
->signed_p
)
8974 ("both %<signed%> and %<_Bool%> in "
8975 "declaration specifiers"));
8976 else if (specs
->unsigned_p
)
8978 ("both %<unsigned%> and %<_Bool%> in "
8979 "declaration specifiers"));
8980 else if (specs
->complex_p
)
8982 ("both %<complex%> and %<_Bool%> in "
8983 "declaration specifiers"));
8984 else if (specs
->saturating_p
)
8986 ("both %<_Sat%> and %<_Bool%> in "
8987 "declaration specifiers"));
8989 specs
->typespec_word
= cts_bool
;
8994 ("both %<long%> and %<char%> in "
8995 "declaration specifiers"));
8996 else if (specs
->short_p
)
8998 ("both %<short%> and %<char%> in "
8999 "declaration specifiers"));
9000 else if (specs
->saturating_p
)
9002 ("both %<_Sat%> and %<char%> in "
9003 "declaration specifiers"));
9005 specs
->typespec_word
= cts_char
;
9008 if (specs
->saturating_p
)
9010 ("both %<_Sat%> and %<int%> in "
9011 "declaration specifiers"));
9013 specs
->typespec_word
= cts_int
;
9018 ("both %<long%> and %<float%> in "
9019 "declaration specifiers"));
9020 else if (specs
->short_p
)
9022 ("both %<short%> and %<float%> in "
9023 "declaration specifiers"));
9024 else if (specs
->signed_p
)
9026 ("both %<signed%> and %<float%> in "
9027 "declaration specifiers"));
9028 else if (specs
->unsigned_p
)
9030 ("both %<unsigned%> and %<float%> in "
9031 "declaration specifiers"));
9032 else if (specs
->saturating_p
)
9034 ("both %<_Sat%> and %<float%> in "
9035 "declaration specifiers"));
9037 specs
->typespec_word
= cts_float
;
9040 if (specs
->long_long_p
)
9042 ("both %<long long%> and %<double%> in "
9043 "declaration specifiers"));
9044 else if (specs
->short_p
)
9046 ("both %<short%> and %<double%> in "
9047 "declaration specifiers"));
9048 else if (specs
->signed_p
)
9050 ("both %<signed%> and %<double%> in "
9051 "declaration specifiers"));
9052 else if (specs
->unsigned_p
)
9054 ("both %<unsigned%> and %<double%> in "
9055 "declaration specifiers"));
9056 else if (specs
->saturating_p
)
9058 ("both %<_Sat%> and %<double%> in "
9059 "declaration specifiers"));
9061 specs
->typespec_word
= cts_double
;
9068 if (i
== RID_DFLOAT32
)
9070 else if (i
== RID_DFLOAT64
)
9073 str
= "_Decimal128";
9074 if (specs
->long_long_p
)
9076 ("both %<long long%> and %<%s%> in "
9077 "declaration specifiers"),
9081 ("both %<long%> and %<%s%> in "
9082 "declaration specifiers"),
9084 else if (specs
->short_p
)
9086 ("both %<short%> and %<%s%> in "
9087 "declaration specifiers"),
9089 else if (specs
->signed_p
)
9091 ("both %<signed%> and %<%s%> in "
9092 "declaration specifiers"),
9094 else if (specs
->unsigned_p
)
9096 ("both %<unsigned%> and %<%s%> in "
9097 "declaration specifiers"),
9099 else if (specs
->complex_p
)
9101 ("both %<complex%> and %<%s%> in "
9102 "declaration specifiers"),
9104 else if (specs
->saturating_p
)
9106 ("both %<_Sat%> and %<%s%> in "
9107 "declaration specifiers"),
9109 else if (i
== RID_DFLOAT32
)
9110 specs
->typespec_word
= cts_dfloat32
;
9111 else if (i
== RID_DFLOAT64
)
9112 specs
->typespec_word
= cts_dfloat64
;
9114 specs
->typespec_word
= cts_dfloat128
;
9116 if (!targetm
.decimal_float_supported_p ())
9118 ("decimal floating point not supported "
9119 "for this target"));
9120 pedwarn (loc
, OPT_pedantic
,
9121 "ISO C does not support decimal floating point");
9131 if (specs
->complex_p
)
9133 ("both %<complex%> and %<%s%> in "
9134 "declaration specifiers"),
9136 else if (i
== RID_FRACT
)
9137 specs
->typespec_word
= cts_fract
;
9139 specs
->typespec_word
= cts_accum
;
9141 if (!targetm
.fixed_point_supported_p ())
9143 "fixed-point types not supported for this target");
9144 pedwarn (loc
, OPT_pedantic
,
9145 "ISO C does not support fixed-point types");
9148 /* ObjC reserved word "id", handled below. */
9154 /* Now we have a typedef (a TYPE_DECL node), an identifier (some
9155 form of ObjC type, cases such as "int" and "long" being handled
9156 above), a TYPE (struct, union, enum and typeof specifiers) or an
9157 ERROR_MARK. In none of these cases may there have previously
9158 been any type specifiers. */
9159 if (specs
->type
|| specs
->typespec_word
!= cts_none
9160 || specs
->long_p
|| specs
->short_p
|| specs
->signed_p
9161 || specs
->unsigned_p
|| specs
->complex_p
)
9162 error_at (loc
, "two or more data types in declaration specifiers");
9163 else if (TREE_CODE (type
) == TYPE_DECL
)
9165 if (TREE_TYPE (type
) == error_mark_node
)
9166 ; /* Allow the type to default to int to avoid cascading errors. */
9169 specs
->type
= TREE_TYPE (type
);
9170 specs
->decl_attr
= DECL_ATTRIBUTES (type
);
9171 specs
->typedef_p
= true;
9172 specs
->explicit_signed_p
= C_TYPEDEF_EXPLICITLY_SIGNED (type
);
9174 /* If this typedef name is defined in a struct, then a C++
9175 lookup would return a different value. */
9177 && I_SYMBOL_BINDING (DECL_NAME (type
))->in_struct
)
9178 warning_at (loc
, OPT_Wc___compat
,
9179 "C++ lookup of %qD would return a field, not a type",
9182 /* If we are parsing a struct, record that a struct field
9184 if (warn_cxx_compat
&& struct_parse_info
!= NULL
)
9185 VEC_safe_push (tree
, heap
, struct_parse_info
->typedefs_seen
, type
);
9188 else if (TREE_CODE (type
) == IDENTIFIER_NODE
)
9190 tree t
= lookup_name (type
);
9191 if (!t
|| TREE_CODE (t
) != TYPE_DECL
)
9192 error_at (loc
, "%qE fails to be a typedef or built in type", type
);
9193 else if (TREE_TYPE (t
) == error_mark_node
)
9196 specs
->type
= TREE_TYPE (t
);
9198 else if (TREE_CODE (type
) != ERROR_MARK
)
9200 if (spec
.kind
== ctsk_tagdef
|| spec
.kind
== ctsk_tagfirstref
)
9201 specs
->tag_defined_p
= true;
9202 if (spec
.kind
== ctsk_typeof
)
9204 specs
->typedef_p
= true;
9208 specs
->expr
= build2 (COMPOUND_EXPR
, TREE_TYPE (spec
.expr
),
9209 specs
->expr
, spec
.expr
);
9211 specs
->expr
= spec
.expr
;
9212 specs
->expr_const_operands
&= spec
.expr_const_operands
;
9221 /* Add the storage class specifier or function specifier SCSPEC to the
9222 declaration specifiers SPECS, returning SPECS. */
9224 struct c_declspecs
*
9225 declspecs_add_scspec (struct c_declspecs
*specs
, tree scspec
)
9228 enum c_storage_class n
= csc_none
;
9230 specs
->declspecs_seen_p
= true;
9231 gcc_assert (TREE_CODE (scspec
) == IDENTIFIER_NODE
9232 && C_IS_RESERVED_WORD (scspec
));
9233 i
= C_RID_CODE (scspec
);
9234 if (specs
->non_sc_seen_p
)
9235 warning (OPT_Wold_style_declaration
,
9236 "%qE is not at beginning of declaration", scspec
);
9240 /* C99 permits duplicate inline. Although of doubtful utility,
9241 it seems simplest to permit it in gnu89 mode as well, as
9242 there is also little utility in maintaining this as a
9243 difference between gnu89 and C99 inline. */
9245 specs
->inline_p
= true;
9248 dupe
= specs
->thread_p
;
9249 if (specs
->storage_class
== csc_auto
)
9250 error ("%<__thread%> used with %<auto%>");
9251 else if (specs
->storage_class
== csc_register
)
9252 error ("%<__thread%> used with %<register%>");
9253 else if (specs
->storage_class
== csc_typedef
)
9254 error ("%<__thread%> used with %<typedef%>");
9256 specs
->thread_p
= true;
9263 /* Diagnose "__thread extern". */
9264 if (specs
->thread_p
)
9265 error ("%<__thread%> before %<extern%>");
9272 /* Diagnose "__thread static". */
9273 if (specs
->thread_p
)
9274 error ("%<__thread%> before %<static%>");
9282 if (n
!= csc_none
&& n
== specs
->storage_class
)
9285 error ("duplicate %qE", scspec
);
9288 if (specs
->storage_class
!= csc_none
&& n
!= specs
->storage_class
)
9290 error ("multiple storage classes in declaration specifiers");
9294 specs
->storage_class
= n
;
9295 if (n
!= csc_extern
&& n
!= csc_static
&& specs
->thread_p
)
9297 error ("%<__thread%> used with %qE", scspec
);
9298 specs
->thread_p
= false;
9305 /* Add the attributes ATTRS to the declaration specifiers SPECS,
9308 struct c_declspecs
*
9309 declspecs_add_attrs (struct c_declspecs
*specs
, tree attrs
)
9311 specs
->attrs
= chainon (attrs
, specs
->attrs
);
9312 specs
->declspecs_seen_p
= true;
9316 /* Combine "long", "short", "signed", "unsigned" and "_Complex" type
9317 specifiers with any other type specifier to determine the resulting
9318 type. This is where ISO C checks on complex types are made, since
9319 "_Complex long" is a prefix of the valid ISO C type "_Complex long
9322 struct c_declspecs
*
9323 finish_declspecs (struct c_declspecs
*specs
)
9325 /* If a type was specified as a whole, we have no modifiers and are
9327 if (specs
->type
!= NULL_TREE
)
9329 gcc_assert (!specs
->long_p
&& !specs
->long_long_p
&& !specs
->short_p
9330 && !specs
->signed_p
&& !specs
->unsigned_p
9331 && !specs
->complex_p
);
9335 /* If none of "void", "_Bool", "char", "int", "float" or "double"
9336 has been specified, treat it as "int" unless "_Complex" is
9337 present and there are no other specifiers. If we just have
9338 "_Complex", it is equivalent to "_Complex double", but e.g.
9339 "_Complex short" is equivalent to "_Complex short int". */
9340 if (specs
->typespec_word
== cts_none
)
9342 if (specs
->saturating_p
)
9344 error ("%<_Sat%> is used without %<_Fract%> or %<_Accum%>");
9345 if (!targetm
.fixed_point_supported_p ())
9346 error ("fixed-point types not supported for this target");
9347 specs
->typespec_word
= cts_fract
;
9349 else if (specs
->long_p
|| specs
->short_p
9350 || specs
->signed_p
|| specs
->unsigned_p
)
9352 specs
->typespec_word
= cts_int
;
9354 else if (specs
->complex_p
)
9356 specs
->typespec_word
= cts_double
;
9357 pedwarn (input_location
, OPT_pedantic
,
9358 "ISO C does not support plain %<complex%> meaning "
9359 "%<double complex%>");
9363 specs
->typespec_word
= cts_int
;
9364 specs
->default_int_p
= true;
9365 /* We don't diagnose this here because grokdeclarator will
9366 give more specific diagnostics according to whether it is
9367 a function definition. */
9371 /* If "signed" was specified, record this to distinguish "int" and
9372 "signed int" in the case of a bit-field with
9373 -funsigned-bitfields. */
9374 specs
->explicit_signed_p
= specs
->signed_p
;
9376 /* Now compute the actual type. */
9377 switch (specs
->typespec_word
)
9380 gcc_assert (!specs
->long_p
&& !specs
->short_p
9381 && !specs
->signed_p
&& !specs
->unsigned_p
9382 && !specs
->complex_p
);
9383 specs
->type
= void_type_node
;
9386 gcc_assert (!specs
->long_p
&& !specs
->short_p
9387 && !specs
->signed_p
&& !specs
->unsigned_p
9388 && !specs
->complex_p
);
9389 specs
->type
= boolean_type_node
;
9392 gcc_assert (!specs
->long_p
&& !specs
->short_p
);
9393 gcc_assert (!(specs
->signed_p
&& specs
->unsigned_p
));
9394 if (specs
->signed_p
)
9395 specs
->type
= signed_char_type_node
;
9396 else if (specs
->unsigned_p
)
9397 specs
->type
= unsigned_char_type_node
;
9399 specs
->type
= char_type_node
;
9400 if (specs
->complex_p
)
9402 pedwarn (input_location
, OPT_pedantic
,
9403 "ISO C does not support complex integer types");
9404 specs
->type
= build_complex_type (specs
->type
);
9408 gcc_assert (!specs
->long_p
&& !specs
->short_p
&& !specs
->long_long_p
);
9409 gcc_assert (!(specs
->signed_p
&& specs
->unsigned_p
));
9410 specs
->type
= (specs
->unsigned_p
9411 ? int128_unsigned_type_node
9412 : int128_integer_type_node
);
9413 if (specs
->complex_p
)
9415 pedwarn (input_location
, OPT_pedantic
,
9416 "ISO C does not support complex integer types");
9417 specs
->type
= build_complex_type (specs
->type
);
9421 gcc_assert (!(specs
->long_p
&& specs
->short_p
));
9422 gcc_assert (!(specs
->signed_p
&& specs
->unsigned_p
));
9423 if (specs
->long_long_p
)
9424 specs
->type
= (specs
->unsigned_p
9425 ? long_long_unsigned_type_node
9426 : long_long_integer_type_node
);
9427 else if (specs
->long_p
)
9428 specs
->type
= (specs
->unsigned_p
9429 ? long_unsigned_type_node
9430 : long_integer_type_node
);
9431 else if (specs
->short_p
)
9432 specs
->type
= (specs
->unsigned_p
9433 ? short_unsigned_type_node
9434 : short_integer_type_node
);
9436 specs
->type
= (specs
->unsigned_p
9437 ? unsigned_type_node
9438 : integer_type_node
);
9439 if (specs
->complex_p
)
9441 pedwarn (input_location
, OPT_pedantic
,
9442 "ISO C does not support complex integer types");
9443 specs
->type
= build_complex_type (specs
->type
);
9447 gcc_assert (!specs
->long_p
&& !specs
->short_p
9448 && !specs
->signed_p
&& !specs
->unsigned_p
);
9449 specs
->type
= (specs
->complex_p
9450 ? complex_float_type_node
9454 gcc_assert (!specs
->long_long_p
&& !specs
->short_p
9455 && !specs
->signed_p
&& !specs
->unsigned_p
);
9458 specs
->type
= (specs
->complex_p
9459 ? complex_long_double_type_node
9460 : long_double_type_node
);
9464 specs
->type
= (specs
->complex_p
9465 ? complex_double_type_node
9466 : double_type_node
);
9472 gcc_assert (!specs
->long_p
&& !specs
->long_long_p
&& !specs
->short_p
9473 && !specs
->signed_p
&& !specs
->unsigned_p
&& !specs
->complex_p
);
9474 if (specs
->typespec_word
== cts_dfloat32
)
9475 specs
->type
= dfloat32_type_node
;
9476 else if (specs
->typespec_word
== cts_dfloat64
)
9477 specs
->type
= dfloat64_type_node
;
9479 specs
->type
= dfloat128_type_node
;
9482 gcc_assert (!specs
->complex_p
);
9483 if (!targetm
.fixed_point_supported_p ())
9484 specs
->type
= integer_type_node
;
9485 else if (specs
->saturating_p
)
9487 if (specs
->long_long_p
)
9488 specs
->type
= specs
->unsigned_p
9489 ? sat_unsigned_long_long_fract_type_node
9490 : sat_long_long_fract_type_node
;
9491 else if (specs
->long_p
)
9492 specs
->type
= specs
->unsigned_p
9493 ? sat_unsigned_long_fract_type_node
9494 : sat_long_fract_type_node
;
9495 else if (specs
->short_p
)
9496 specs
->type
= specs
->unsigned_p
9497 ? sat_unsigned_short_fract_type_node
9498 : sat_short_fract_type_node
;
9500 specs
->type
= specs
->unsigned_p
9501 ? sat_unsigned_fract_type_node
9502 : sat_fract_type_node
;
9506 if (specs
->long_long_p
)
9507 specs
->type
= specs
->unsigned_p
9508 ? unsigned_long_long_fract_type_node
9509 : long_long_fract_type_node
;
9510 else if (specs
->long_p
)
9511 specs
->type
= specs
->unsigned_p
9512 ? unsigned_long_fract_type_node
9513 : long_fract_type_node
;
9514 else if (specs
->short_p
)
9515 specs
->type
= specs
->unsigned_p
9516 ? unsigned_short_fract_type_node
9517 : short_fract_type_node
;
9519 specs
->type
= specs
->unsigned_p
9520 ? unsigned_fract_type_node
9525 gcc_assert (!specs
->complex_p
);
9526 if (!targetm
.fixed_point_supported_p ())
9527 specs
->type
= integer_type_node
;
9528 else if (specs
->saturating_p
)
9530 if (specs
->long_long_p
)
9531 specs
->type
= specs
->unsigned_p
9532 ? sat_unsigned_long_long_accum_type_node
9533 : sat_long_long_accum_type_node
;
9534 else if (specs
->long_p
)
9535 specs
->type
= specs
->unsigned_p
9536 ? sat_unsigned_long_accum_type_node
9537 : sat_long_accum_type_node
;
9538 else if (specs
->short_p
)
9539 specs
->type
= specs
->unsigned_p
9540 ? sat_unsigned_short_accum_type_node
9541 : sat_short_accum_type_node
;
9543 specs
->type
= specs
->unsigned_p
9544 ? sat_unsigned_accum_type_node
9545 : sat_accum_type_node
;
9549 if (specs
->long_long_p
)
9550 specs
->type
= specs
->unsigned_p
9551 ? unsigned_long_long_accum_type_node
9552 : long_long_accum_type_node
;
9553 else if (specs
->long_p
)
9554 specs
->type
= specs
->unsigned_p
9555 ? unsigned_long_accum_type_node
9556 : long_accum_type_node
;
9557 else if (specs
->short_p
)
9558 specs
->type
= specs
->unsigned_p
9559 ? unsigned_short_accum_type_node
9560 : short_accum_type_node
;
9562 specs
->type
= specs
->unsigned_p
9563 ? unsigned_accum_type_node
9574 /* A subroutine of c_write_global_declarations. Perform final processing
9575 on one file scope's declarations (or the external scope's declarations),
9579 c_write_global_declarations_1 (tree globals
)
9584 /* Process the decls in the order they were written. */
9585 for (decl
= globals
; decl
; decl
= DECL_CHAIN (decl
))
9587 /* Check for used but undefined static functions using the C
9588 standard's definition of "used", and set TREE_NO_WARNING so
9589 that check_global_declarations doesn't repeat the check. */
9590 if (TREE_CODE (decl
) == FUNCTION_DECL
9591 && DECL_INITIAL (decl
) == 0
9592 && DECL_EXTERNAL (decl
)
9593 && !TREE_PUBLIC (decl
)
9594 && C_DECL_USED (decl
))
9596 pedwarn (input_location
, 0, "%q+F used but never defined", decl
);
9597 TREE_NO_WARNING (decl
) = 1;
9600 wrapup_global_declaration_1 (decl
);
9606 for (decl
= globals
; decl
; decl
= DECL_CHAIN (decl
))
9607 reconsider
|= wrapup_global_declaration_2 (decl
);
9611 for (decl
= globals
; decl
; decl
= DECL_CHAIN (decl
))
9612 check_global_declaration_1 (decl
);
9615 /* A subroutine of c_write_global_declarations Emit debug information for each
9616 of the declarations in GLOBALS. */
9619 c_write_global_declarations_2 (tree globals
)
9623 for (decl
= globals
; decl
; decl
= DECL_CHAIN (decl
))
9624 debug_hooks
->global_decl (decl
);
9627 /* Callback to collect a source_ref from a DECL. */
9630 collect_source_ref_cb (tree decl
)
9632 if (!DECL_IS_BUILTIN (decl
))
9633 collect_source_ref (LOCATION_FILE (decl_sloc (decl
, false)));
9636 /* Collect all references relevant to SOURCE_FILE. */
9639 collect_all_refs (const char *source_file
)
9643 for (t
= all_translation_units
; t
; t
= TREE_CHAIN (t
))
9644 collect_ada_nodes (BLOCK_VARS (DECL_INITIAL (t
)), source_file
);
9647 /* Iterate over all global declarations and call CALLBACK. */
9650 for_each_global_decl (void (*callback
) (tree decl
))
9656 for (t
= all_translation_units
; t
; t
= TREE_CHAIN (t
))
9658 decls
= DECL_INITIAL (t
);
9659 for (decl
= BLOCK_VARS (decls
); decl
; decl
= TREE_CHAIN (decl
))
9664 /* Preserve the external declarations scope across a garbage collect. */
9665 static GTY(()) tree ext_block
;
9668 c_write_global_declarations (void)
9672 /* We don't want to do this if generating a PCH. */
9676 /* Close the external scope. */
9677 ext_block
= pop_scope ();
9679 gcc_assert (!current_scope
);
9681 /* Handle -fdump-ada-spec[-slim]. */
9682 if (dump_enabled_p (TDI_ada
))
9684 /* Build a table of files to generate specs for */
9685 if (get_dump_file_info (TDI_ada
)->flags
& TDF_SLIM
)
9686 collect_source_ref (main_input_filename
);
9688 for_each_global_decl (collect_source_ref_cb
);
9690 dump_ada_specs (collect_all_refs
, NULL
);
9695 tree tmp
= BLOCK_VARS (ext_block
);
9697 FILE * stream
= dump_begin (TDI_tu
, &flags
);
9700 dump_node (tmp
, flags
& ~TDF_SLIM
, stream
);
9701 dump_end (TDI_tu
, stream
);
9705 /* Process all file scopes in this compilation, and the external_scope,
9706 through wrapup_global_declarations and check_global_declarations. */
9707 for (t
= all_translation_units
; t
; t
= DECL_CHAIN (t
))
9708 c_write_global_declarations_1 (BLOCK_VARS (DECL_INITIAL (t
)));
9709 c_write_global_declarations_1 (BLOCK_VARS (ext_block
));
9711 /* We're done parsing; proceed to optimize and emit assembly.
9712 FIXME: shouldn't be the front end's responsibility to call this. */
9713 cgraph_finalize_compilation_unit ();
9715 /* After cgraph has had a chance to emit everything that's going to
9716 be emitted, output debug information for globals. */
9719 timevar_push (TV_SYMOUT
);
9720 for (t
= all_translation_units
; t
; t
= DECL_CHAIN (t
))
9721 c_write_global_declarations_2 (BLOCK_VARS (DECL_INITIAL (t
)));
9722 c_write_global_declarations_2 (BLOCK_VARS (ext_block
));
9723 timevar_pop (TV_SYMOUT
);
9729 /* Register reserved keyword WORD as qualifier for address space AS. */
9732 c_register_addr_space (const char *word
, addr_space_t as
)
9734 int rid
= RID_FIRST_ADDR_SPACE
+ as
;
9737 /* Address space qualifiers are only supported
9738 in C with GNU extensions enabled. */
9739 if (c_dialect_objc () || flag_no_asm
)
9742 id
= get_identifier (word
);
9743 C_SET_RID_CODE (id
, rid
);
9744 C_IS_RESERVED_WORD (id
) = 1;
9745 ridpointers
[rid
] = id
;
9748 #include "gt-c-decl.h"