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"
54 #include "langhooks.h"
55 #include "tree-mudflap.h"
57 #include "tree-iterator.h"
58 #include "diagnostic.h"
59 #include "tree-dump.h"
64 #include "langhooks-def.h"
65 #include "pointer-set.h"
69 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
71 { NORMAL
, /* Ordinary declaration */
72 FUNCDEF
, /* Function definition */
73 PARM
, /* Declaration of parm before function body */
74 FIELD
, /* Declaration inside struct or union */
75 TYPENAME
}; /* Typename (inside cast or sizeof) */
77 /* States indicating how grokdeclarator() should handle declspecs marked
78 with __attribute__((deprecated)). An object declared as
79 __attribute__((deprecated)) suppresses warnings of uses of other
82 enum deprecated_states
{
88 /* Nonzero if we have seen an invalid cross reference
89 to a struct, union, or enum, but not yet printed the message. */
90 tree pending_invalid_xref
;
92 /* File and line to appear in the eventual error message. */
93 location_t pending_invalid_xref_location
;
95 /* The file and line that the prototype came from if this is an
96 old-style definition; used for diagnostics in
97 store_parm_decls_oldstyle. */
99 static location_t current_function_prototype_locus
;
101 /* Whether this prototype was built-in. */
103 static bool current_function_prototype_built_in
;
105 /* The argument type information of this prototype. */
107 static tree current_function_prototype_arg_types
;
109 /* The argument information structure for the function currently being
112 static struct c_arg_info
*current_function_arg_info
;
114 /* The obstack on which parser and related data structures, which are
115 not live beyond their top-level declaration or definition, are
117 struct obstack parser_obstack
;
119 /* The current statement tree. */
121 static GTY(()) struct stmt_tree_s c_stmt_tree
;
123 /* State saving variables. */
127 /* Linked list of TRANSLATION_UNIT_DECLS for the translation units
128 included in this invocation. Note that the current translation
129 unit is not included in this list. */
131 static GTY(()) tree all_translation_units
;
133 /* A list of decls to be made automatically visible in each file scope. */
134 static GTY(()) tree visible_builtins
;
136 /* Set to 0 at beginning of a function definition, set to 1 if
137 a return statement that specifies a return value is seen. */
139 int current_function_returns_value
;
141 /* Set to 0 at beginning of a function definition, set to 1 if
142 a return statement with no argument is seen. */
144 int current_function_returns_null
;
146 /* Set to 0 at beginning of a function definition, set to 1 if
147 a call to a noreturn function is seen. */
149 int current_function_returns_abnormally
;
151 /* Set to nonzero by `grokdeclarator' for a function
152 whose return type is defaulted, if warnings for this are desired. */
154 static int warn_about_return_type
;
156 /* Nonzero when the current toplevel function contains a declaration
157 of a nested function which is never defined. */
159 static bool undef_nested_function
;
161 /* True means global_bindings_p should return false even if the scope stack
162 says we are in file scope. */
163 bool c_override_global_bindings_to_false
;
166 /* Each c_binding structure describes one binding of an identifier to
167 a decl. All the decls in a scope - irrespective of namespace - are
168 chained together by the ->prev field, which (as the name implies)
169 runs in reverse order. All the decls in a given namespace bound to
170 a given identifier are chained by the ->shadowed field, which runs
171 from inner to outer scopes.
173 The ->decl field usually points to a DECL node, but there are two
174 exceptions. In the namespace of type tags, the bound entity is a
175 RECORD_TYPE, UNION_TYPE, or ENUMERAL_TYPE node. If an undeclared
176 identifier is encountered, it is bound to error_mark_node to
177 suppress further errors about that identifier in the current
180 The ->u.type field stores the type of the declaration in this scope;
181 if NULL, the type is the type of the ->decl field. This is only of
182 relevance for objects with external or internal linkage which may
183 be redeclared in inner scopes, forming composite types that only
184 persist for the duration of those scopes. In the external scope,
185 this stores the composite of all the types declared for this
186 object, visible or not. The ->inner_comp field (used only at file
187 scope) stores whether an incomplete array type at file scope was
188 completed at an inner scope to an array size other than 1.
190 The ->u.label field is used for labels. It points to a structure
191 which stores additional information used for warnings.
193 The depth field is copied from the scope structure that holds this
194 decl. It is used to preserve the proper ordering of the ->shadowed
195 field (see bind()) and also for a handful of special-case checks.
196 Finally, the invisible bit is true for a decl which should be
197 ignored for purposes of normal name lookup, and the nested bit is
198 true for a decl that's been bound a second time in an inner scope;
199 in all such cases, the binding in the outer scope will have its
200 invisible bit true. */
202 struct GTY((chain_next ("%h.prev"))) c_binding
{
203 union GTY(()) { /* first so GTY desc can use decl */
204 tree
GTY((tag ("0"))) type
; /* the type in this scope */
205 struct c_label_vars
* GTY((tag ("1"))) label
; /* for warnings */
206 } GTY((desc ("TREE_CODE (%0.decl) == LABEL_DECL"))) u
;
207 tree decl
; /* the decl bound */
208 tree id
; /* the identifier it's bound to */
209 struct c_binding
*prev
; /* the previous decl in this scope */
210 struct c_binding
*shadowed
; /* the innermost decl shadowed by this one */
211 unsigned int depth
: 28; /* depth of this scope */
212 BOOL_BITFIELD invisible
: 1; /* normal lookup should ignore this binding */
213 BOOL_BITFIELD nested
: 1; /* do not set DECL_CONTEXT when popping */
214 BOOL_BITFIELD inner_comp
: 1; /* incomplete array completed in inner scope */
215 BOOL_BITFIELD in_struct
: 1; /* currently defined as struct field */
216 location_t locus
; /* location for nested bindings */
218 #define B_IN_SCOPE(b1, b2) ((b1)->depth == (b2)->depth)
219 #define B_IN_CURRENT_SCOPE(b) ((b)->depth == current_scope->depth)
220 #define B_IN_FILE_SCOPE(b) ((b)->depth == 1 /*file_scope->depth*/)
221 #define B_IN_EXTERNAL_SCOPE(b) ((b)->depth == 0 /*external_scope->depth*/)
223 #define I_SYMBOL_BINDING(node) \
224 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->symbol_binding)
225 #define I_SYMBOL_DECL(node) \
226 (I_SYMBOL_BINDING(node) ? I_SYMBOL_BINDING(node)->decl : 0)
228 #define I_TAG_BINDING(node) \
229 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->tag_binding)
230 #define I_TAG_DECL(node) \
231 (I_TAG_BINDING(node) ? I_TAG_BINDING(node)->decl : 0)
233 #define I_LABEL_BINDING(node) \
234 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->label_binding)
235 #define I_LABEL_DECL(node) \
236 (I_LABEL_BINDING(node) ? I_LABEL_BINDING(node)->decl : 0)
238 /* Each C symbol points to three linked lists of c_binding structures.
239 These describe the values of the identifier in the three different
240 namespaces defined by the language. */
242 struct GTY(()) lang_identifier
{
243 struct c_common_identifier common_id
;
244 struct c_binding
*symbol_binding
; /* vars, funcs, constants, typedefs */
245 struct c_binding
*tag_binding
; /* struct/union/enum tags */
246 struct c_binding
*label_binding
; /* labels */
249 /* Validate c-lang.c's assumptions. */
250 extern char C_SIZEOF_STRUCT_LANG_IDENTIFIER_isnt_accurate
251 [(sizeof(struct lang_identifier
) == C_SIZEOF_STRUCT_LANG_IDENTIFIER
) ? 1 : -1];
253 /* The resulting tree type. */
255 union GTY((desc ("TREE_CODE (&%h.generic) == IDENTIFIER_NODE"),
256 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
258 union tree_node
GTY ((tag ("0"),
259 desc ("tree_node_structure (&%h)")))
261 struct lang_identifier
GTY ((tag ("1"))) identifier
;
264 /* Track bindings and other things that matter for goto warnings. For
265 efficiency, we do not gather all the decls at the point of
266 definition. Instead, we point into the bindings structure. As
267 scopes are popped, we update these structures and gather the decls
268 that matter at that time. */
270 struct GTY(()) c_spot_bindings
{
271 /* The currently open scope which holds bindings defined when the
272 label was defined or the goto statement was found. */
273 struct c_scope
*scope
;
274 /* The bindings in the scope field which were defined at the point
275 of the label or goto. This lets us look at older or newer
276 bindings in the scope, as appropriate. */
277 struct c_binding
*bindings_in_scope
;
278 /* The number of statement expressions that have started since this
279 label or goto statement was defined. This is zero if we are at
280 the same statement expression level. It is positive if we are in
281 a statement expression started since this spot. It is negative
282 if this spot was in a statement expression and we have left
285 /* Whether we started in a statement expression but are no longer in
286 it. This is set to true if stmt_exprs ever goes negative. */
290 /* This structure is used to keep track of bindings seen when a goto
291 statement is defined. This is only used if we see the goto
292 statement before we see the label. */
294 struct GTY(()) c_goto_bindings
{
295 /* The location of the goto statement. */
297 /* The bindings of the goto statement. */
298 struct c_spot_bindings goto_bindings
;
301 typedef struct c_goto_bindings
*c_goto_bindings_p
;
302 DEF_VEC_P(c_goto_bindings_p
);
303 DEF_VEC_ALLOC_P(c_goto_bindings_p
,gc
);
305 /* The additional information we keep track of for a label binding.
306 These fields are updated as scopes are popped. */
308 struct GTY(()) c_label_vars
{
309 /* The shadowed c_label_vars, when one label shadows another (which
310 can only happen using a __label__ declaration). */
311 struct c_label_vars
*shadowed
;
312 /* The bindings when the label was defined. */
313 struct c_spot_bindings label_bindings
;
314 /* A list of decls that we care about: decls about which we should
315 warn if a goto branches to this label from later in the function.
316 Decls are added to this list as scopes are popped. We only add
317 the decls that matter. */
318 VEC(tree
,gc
) *decls_in_scope
;
319 /* A list of goto statements to this label. This is only used for
320 goto statements seen before the label was defined, so that we can
321 issue appropriate warnings for them. */
322 VEC(c_goto_bindings_p
,gc
) *gotos
;
325 /* Each c_scope structure describes the complete contents of one
326 scope. Four scopes are distinguished specially: the innermost or
327 current scope, the innermost function scope, the file scope (always
328 the second to outermost) and the outermost or external scope.
330 Most declarations are recorded in the current scope.
332 All normal label declarations are recorded in the innermost
333 function scope, as are bindings of undeclared identifiers to
334 error_mark_node. (GCC permits nested functions as an extension,
335 hence the 'innermost' qualifier.) Explicitly declared labels
336 (using the __label__ extension) appear in the current scope.
338 Being in the file scope (current_scope == file_scope) causes
339 special behavior in several places below. Also, under some
340 conditions the Objective-C front end records declarations in the
341 file scope even though that isn't the current scope.
343 All declarations with external linkage are recorded in the external
344 scope, even if they aren't visible there; this models the fact that
345 such declarations are visible to the entire program, and (with a
346 bit of cleverness, see pushdecl) allows diagnosis of some violations
347 of C99 6.2.2p7 and 6.2.7p2:
349 If, within the same translation unit, the same identifier appears
350 with both internal and external linkage, the behavior is
353 All declarations that refer to the same object or function shall
354 have compatible type; otherwise, the behavior is undefined.
356 Initially only the built-in declarations, which describe compiler
357 intrinsic functions plus a subset of the standard library, are in
360 The order of the blocks list matters, and it is frequently appended
361 to. To avoid having to walk all the way to the end of the list on
362 each insertion, or reverse the list later, we maintain a pointer to
363 the last list entry. (FIXME: It should be feasible to use a reversed
366 The bindings list is strictly in reverse order of declarations;
367 pop_scope relies on this. */
370 struct GTY((chain_next ("%h.outer"))) c_scope
{
371 /* The scope containing this one. */
372 struct c_scope
*outer
;
374 /* The next outermost function scope. */
375 struct c_scope
*outer_function
;
377 /* All bindings in this scope. */
378 struct c_binding
*bindings
;
380 /* For each scope (except the global one), a chain of BLOCK nodes
381 for all the scopes that were entered and exited one level down. */
385 /* The depth of this scope. Used to keep the ->shadowed chain of
386 bindings sorted innermost to outermost. */
387 unsigned int depth
: 28;
389 /* True if we are currently filling this scope with parameter
391 BOOL_BITFIELD parm_flag
: 1;
393 /* True if we saw [*] in this scope. Used to give an error messages
394 if these appears in a function definition. */
395 BOOL_BITFIELD had_vla_unspec
: 1;
397 /* True if we already complained about forward parameter decls
398 in this scope. This prevents double warnings on
399 foo (int a; int b; ...) */
400 BOOL_BITFIELD warned_forward_parm_decls
: 1;
402 /* True if this is the outermost block scope of a function body.
403 This scope contains the parameters, the local variables declared
404 in the outermost block, and all the labels (except those in
405 nested functions, or declared at block scope with __label__). */
406 BOOL_BITFIELD function_body
: 1;
408 /* True means make a BLOCK for this scope no matter what. */
409 BOOL_BITFIELD keep
: 1;
411 /* True means that an unsuffixed float constant is _Decimal64. */
412 BOOL_BITFIELD float_const_decimal64
: 1;
414 /* True if this scope has any label bindings. This is used to speed
415 up searching for labels when popping scopes, particularly since
416 labels are normally only found at function scope. */
417 BOOL_BITFIELD has_label_bindings
: 1;
420 /* The scope currently in effect. */
422 static GTY(()) struct c_scope
*current_scope
;
424 /* The innermost function scope. Ordinary (not explicitly declared)
425 labels, bindings to error_mark_node, and the lazily-created
426 bindings of __func__ and its friends get this scope. */
428 static GTY(()) struct c_scope
*current_function_scope
;
430 /* The C file scope. This is reset for each input translation unit. */
432 static GTY(()) struct c_scope
*file_scope
;
434 /* The outermost scope. This is used for all declarations with
435 external linkage, and only these, hence the name. */
437 static GTY(()) struct c_scope
*external_scope
;
439 /* A chain of c_scope structures awaiting reuse. */
441 static GTY((deletable
)) struct c_scope
*scope_freelist
;
443 /* A chain of c_binding structures awaiting reuse. */
445 static GTY((deletable
)) struct c_binding
*binding_freelist
;
447 /* Append VAR to LIST in scope SCOPE. */
448 #define SCOPE_LIST_APPEND(scope, list, decl) do { \
449 struct c_scope *s_ = (scope); \
451 if (s_->list##_last) \
452 BLOCK_CHAIN (s_->list##_last) = d_; \
455 s_->list##_last = d_; \
458 /* Concatenate FROM in scope FSCOPE onto TO in scope TSCOPE. */
459 #define SCOPE_LIST_CONCAT(tscope, to, fscope, from) do { \
460 struct c_scope *t_ = (tscope); \
461 struct c_scope *f_ = (fscope); \
463 BLOCK_CHAIN (t_->to##_last) = f_->from; \
466 t_->to##_last = f_->from##_last; \
469 /* A c_inline_static structure stores details of a static identifier
470 referenced in a definition of a function that may be an inline
471 definition if no subsequent declaration of that function uses
472 "extern" or does not use "inline". */
474 struct GTY((chain_next ("%h.next"))) c_inline_static
{
475 /* The location for a diagnostic. */
478 /* The function that may be an inline definition. */
481 /* The object or function referenced. */
484 /* What sort of reference this is. */
485 enum c_inline_static_type type
;
487 /* The next such structure or NULL. */
488 struct c_inline_static
*next
;
491 /* List of static identifiers used or referenced in functions that may
492 be inline definitions. */
493 static GTY(()) struct c_inline_static
*c_inline_statics
;
495 /* True means unconditionally make a BLOCK for the next scope pushed. */
497 static bool keep_next_level_flag
;
499 /* True means the next call to push_scope will be the outermost scope
500 of a function body, so do not push a new scope, merely cease
501 expecting parameter decls. */
503 static bool next_is_function_body
;
505 /* A VEC of pointers to c_binding structures. */
507 typedef struct c_binding
*c_binding_ptr
;
508 DEF_VEC_P(c_binding_ptr
);
509 DEF_VEC_ALLOC_P(c_binding_ptr
,heap
);
511 /* Information that we keep for a struct or union while it is being
514 struct c_struct_parse_info
516 /* If warn_cxx_compat, a list of types defined within this
518 VEC(tree
,heap
) *struct_types
;
519 /* If warn_cxx_compat, a list of field names which have bindings,
520 and which are defined in this struct, but which are not defined
521 in any enclosing struct. This is used to clear the in_struct
522 field of the c_bindings structure. */
523 VEC(c_binding_ptr
,heap
) *fields
;
524 /* If warn_cxx_compat, a list of typedef names used when defining
525 fields in this struct. */
526 VEC(tree
,heap
) *typedefs_seen
;
529 /* Information for the struct or union currently being parsed, or
530 NULL if not parsing a struct or union. */
531 static struct c_struct_parse_info
*struct_parse_info
;
533 /* Forward declarations. */
534 static tree
lookup_name_in_scope (tree
, struct c_scope
*);
535 static tree
c_make_fname_decl (location_t
, tree
, int);
536 static tree
grokdeclarator (const struct c_declarator
*,
537 struct c_declspecs
*,
538 enum decl_context
, bool, tree
*, tree
*, tree
*,
539 bool *, enum deprecated_states
);
540 static tree
grokparms (struct c_arg_info
*, bool);
541 static void layout_array_type (tree
);
543 /* T is a statement. Add it to the statement-tree. This is the
544 C/ObjC version--C++ has a slightly different version of this
550 enum tree_code code
= TREE_CODE (t
);
552 if (CAN_HAVE_LOCATION_P (t
) && code
!= LABEL_EXPR
)
554 if (!EXPR_HAS_LOCATION (t
))
555 SET_EXPR_LOCATION (t
, input_location
);
558 if (code
== LABEL_EXPR
|| code
== CASE_LABEL_EXPR
)
559 STATEMENT_LIST_HAS_LABEL (cur_stmt_list
) = 1;
561 /* Add T to the statement-tree. Non-side-effect statements need to be
562 recorded during statement expressions. */
563 append_to_statement_list_force (t
, &cur_stmt_list
);
570 c_print_identifier (FILE *file
, tree node
, int indent
)
572 print_node (file
, "symbol", I_SYMBOL_DECL (node
), indent
+ 4);
573 print_node (file
, "tag", I_TAG_DECL (node
), indent
+ 4);
574 print_node (file
, "label", I_LABEL_DECL (node
), indent
+ 4);
575 if (C_IS_RESERVED_WORD (node
) && C_RID_CODE (node
) != RID_CXX_COMPAT_WARN
)
577 tree rid
= ridpointers
[C_RID_CODE (node
)];
578 indent_to (file
, indent
+ 4);
579 fprintf (file
, "rid " HOST_PTR_PRINTF
" \"%s\"",
580 (void *) rid
, IDENTIFIER_POINTER (rid
));
584 /* Establish a binding between NAME, an IDENTIFIER_NODE, and DECL,
585 which may be any of several kinds of DECL or TYPE or error_mark_node,
586 in the scope SCOPE. */
588 bind (tree name
, tree decl
, struct c_scope
*scope
, bool invisible
,
589 bool nested
, location_t locus
)
591 struct c_binding
*b
, **here
;
593 if (binding_freelist
)
595 b
= binding_freelist
;
596 binding_freelist
= b
->prev
;
599 b
= GGC_NEW (struct c_binding
);
604 b
->depth
= scope
->depth
;
605 b
->invisible
= invisible
;
613 b
->prev
= scope
->bindings
;
619 switch (TREE_CODE (decl
))
621 case LABEL_DECL
: here
= &I_LABEL_BINDING (name
); break;
624 case RECORD_TYPE
: here
= &I_TAG_BINDING (name
); break;
630 case ERROR_MARK
: here
= &I_SYMBOL_BINDING (name
); break;
636 /* Locate the appropriate place in the chain of shadowed decls
637 to insert this binding. Normally, scope == current_scope and
638 this does nothing. */
639 while (*here
&& (*here
)->depth
> scope
->depth
)
640 here
= &(*here
)->shadowed
;
646 /* Clear the binding structure B, stick it on the binding_freelist,
647 and return the former value of b->prev. This is used by pop_scope
648 and get_parm_info to iterate destructively over all the bindings
649 from a given scope. */
650 static struct c_binding
*
651 free_binding_and_advance (struct c_binding
*b
)
653 struct c_binding
*prev
= b
->prev
;
655 memset (b
, 0, sizeof (struct c_binding
));
656 b
->prev
= binding_freelist
;
657 binding_freelist
= b
;
662 /* Bind a label. Like bind, but skip fields which aren't used for
663 labels, and add the LABEL_VARS value. */
665 bind_label (tree name
, tree label
, struct c_scope
*scope
,
666 struct c_label_vars
*label_vars
)
670 bind (name
, label
, scope
, /*invisible=*/false, /*nested=*/false,
673 scope
->has_label_bindings
= true;
676 gcc_assert (b
->decl
== label
);
677 label_vars
->shadowed
= b
->u
.label
;
678 b
->u
.label
= label_vars
;
681 /* Hook called at end of compilation to assume 1 elt
682 for a file-scope tentative array defn that wasn't complete before. */
685 c_finish_incomplete_decl (tree decl
)
687 if (TREE_CODE (decl
) == VAR_DECL
)
689 tree type
= TREE_TYPE (decl
);
690 if (type
!= error_mark_node
691 && TREE_CODE (type
) == ARRAY_TYPE
692 && !DECL_EXTERNAL (decl
)
693 && TYPE_DOMAIN (type
) == 0)
695 warning_at (DECL_SOURCE_LOCATION (decl
),
696 0, "array %q+D assumed to have one element", decl
);
698 complete_array_type (&TREE_TYPE (decl
), NULL_TREE
, true);
700 layout_decl (decl
, 0);
705 /* Record that inline function FUNC contains a reference (location
706 LOC) to static DECL (file-scope or function-local according to
710 record_inline_static (location_t loc
, tree func
, tree decl
,
711 enum c_inline_static_type type
)
713 struct c_inline_static
*csi
= GGC_NEW (struct c_inline_static
);
715 csi
->function
= func
;
716 csi
->static_decl
= decl
;
718 csi
->next
= c_inline_statics
;
719 c_inline_statics
= csi
;
722 /* Check for references to static declarations in inline functions at
723 the end of the translation unit and diagnose them if the functions
724 are still inline definitions. */
727 check_inline_statics (void)
729 struct c_inline_static
*csi
;
730 for (csi
= c_inline_statics
; csi
; csi
= csi
->next
)
732 if (DECL_EXTERNAL (csi
->function
))
736 pedwarn (csi
->location
, 0,
737 "%qD is static but used in inline function %qD "
738 "which is not static", csi
->static_decl
, csi
->function
);
741 pedwarn (csi
->location
, 0,
742 "%q+D is static but declared in inline function %qD "
743 "which is not static", csi
->static_decl
, csi
->function
);
749 c_inline_statics
= NULL
;
752 /* Fill in a c_spot_bindings structure. If DEFINING is true, set it
753 for the current state, otherwise set it to uninitialized. */
756 set_spot_bindings (struct c_spot_bindings
*p
, bool defining
)
760 p
->scope
= current_scope
;
761 p
->bindings_in_scope
= current_scope
->bindings
;
766 p
->bindings_in_scope
= NULL
;
769 p
->left_stmt_expr
= false;
772 /* Return true if we will want to say something if a goto statement
776 decl_jump_unsafe (tree decl
)
778 if (decl
== error_mark_node
|| TREE_TYPE (decl
) == error_mark_node
)
781 /* Always warn about crossing variably modified types. */
782 if ((TREE_CODE (decl
) == VAR_DECL
|| TREE_CODE (decl
) == TYPE_DECL
)
783 && variably_modified_type_p (TREE_TYPE (decl
), NULL_TREE
))
786 /* Otherwise, only warn if -Wgoto-misses-init and this is an
787 initialized automatic decl. */
788 if (warn_jump_misses_init
789 && TREE_CODE (decl
) == VAR_DECL
790 && !TREE_STATIC (decl
)
791 && DECL_INITIAL (decl
) != NULL_TREE
)
797 /* Update spot bindings P as we pop out of SCOPE. Return true if we
798 should push decls for a label. */
801 update_spot_bindings (struct c_scope
*scope
, struct c_spot_bindings
*p
)
803 if (p
->scope
!= scope
)
805 /* This label or goto is defined in some other scope, or it is a
806 label which is not yet defined. There is nothing to
811 /* Adjust the spot bindings to refer to the bindings already defined
812 in the enclosing scope. */
813 p
->scope
= scope
->outer
;
814 p
->bindings_in_scope
= p
->scope
->bindings
;
819 /* The Objective-C front-end often needs to determine the current scope. */
822 objc_get_current_scope (void)
824 return current_scope
;
827 /* The following function is used only by Objective-C. It needs to live here
828 because it accesses the innards of c_scope. */
831 objc_mark_locals_volatile (void *enclosing_blk
)
833 struct c_scope
*scope
;
836 for (scope
= current_scope
;
837 scope
&& scope
!= enclosing_blk
;
838 scope
= scope
->outer
)
840 for (b
= scope
->bindings
; b
; b
= b
->prev
)
841 objc_volatilize_decl (b
->decl
);
843 /* Do not climb up past the current function. */
844 if (scope
->function_body
)
849 /* Nonzero if we are currently in file scope. */
852 global_bindings_p (void)
854 return (current_scope
== file_scope
&& !c_override_global_bindings_to_false
860 keep_next_level (void)
862 keep_next_level_flag
= true;
865 /* Set the flag for the FLOAT_CONST_DECIMAL64 pragma being ON. */
868 set_float_const_decimal64 (void)
870 current_scope
->float_const_decimal64
= true;
873 /* Clear the flag for the FLOAT_CONST_DECIMAL64 pragma. */
876 clear_float_const_decimal64 (void)
878 current_scope
->float_const_decimal64
= false;
881 /* Return nonzero if an unsuffixed float constant is _Decimal64. */
884 float_const_decimal64_p (void)
886 return current_scope
->float_const_decimal64
;
889 /* Identify this scope as currently being filled with parameters. */
892 declare_parm_level (void)
894 current_scope
->parm_flag
= true;
900 if (next_is_function_body
)
902 /* This is the transition from the parameters to the top level
903 of the function body. These are the same scope
904 (C99 6.2.1p4,6) so we do not push another scope structure.
905 next_is_function_body is set only by store_parm_decls, which
906 in turn is called when and only when we are about to
907 encounter the opening curly brace for the function body.
909 The outermost block of a function always gets a BLOCK node,
910 because the debugging output routines expect that each
911 function has at least one BLOCK. */
912 current_scope
->parm_flag
= false;
913 current_scope
->function_body
= true;
914 current_scope
->keep
= true;
915 current_scope
->outer_function
= current_function_scope
;
916 current_function_scope
= current_scope
;
918 keep_next_level_flag
= false;
919 next_is_function_body
= false;
921 /* The FLOAT_CONST_DECIMAL64 pragma applies to nested scopes. */
922 if (current_scope
->outer
)
923 current_scope
->float_const_decimal64
924 = current_scope
->outer
->float_const_decimal64
;
926 current_scope
->float_const_decimal64
= false;
930 struct c_scope
*scope
;
933 scope
= scope_freelist
;
934 scope_freelist
= scope
->outer
;
937 scope
= GGC_CNEW (struct c_scope
);
939 /* The FLOAT_CONST_DECIMAL64 pragma applies to nested scopes. */
941 scope
->float_const_decimal64
= current_scope
->float_const_decimal64
;
943 scope
->float_const_decimal64
= false;
945 scope
->keep
= keep_next_level_flag
;
946 scope
->outer
= current_scope
;
947 scope
->depth
= current_scope
? (current_scope
->depth
+ 1) : 0;
949 /* Check for scope depth overflow. Unlikely (2^28 == 268,435,456) but
951 if (current_scope
&& scope
->depth
== 0)
954 sorry ("GCC supports only %u nested scopes", scope
->depth
);
957 current_scope
= scope
;
958 keep_next_level_flag
= false;
962 /* This is called when we are leaving SCOPE. For each label defined
963 in SCOPE, add any appropriate decls to its decls_in_scope fields.
964 These are the decls whose initialization will be skipped by a goto
965 later in the function. */
968 update_label_decls (struct c_scope
*scope
)
975 if (s
->has_label_bindings
)
979 for (b
= s
->bindings
; b
!= NULL
; b
= b
->prev
)
981 struct c_label_vars
*label_vars
;
982 struct c_binding
*b1
;
984 struct c_goto_bindings
*g
;
986 if (TREE_CODE (b
->decl
) != LABEL_DECL
)
988 label_vars
= b
->u
.label
;
990 b1
= label_vars
->label_bindings
.bindings_in_scope
;
991 if (update_spot_bindings (scope
, &label_vars
->label_bindings
))
993 /* This label is defined in this scope. */
994 for (; b1
!= NULL
; b1
= b1
->prev
)
996 /* A goto from later in the function to this
997 label will never see the initialization of
998 B1, if any. Save it to issue a warning if
1000 if (decl_jump_unsafe (b1
->decl
))
1001 VEC_safe_push (tree
, gc
, label_vars
->decls_in_scope
,
1006 /* Update the bindings of any goto statements associated
1009 VEC_iterate (c_goto_bindings_p
, label_vars
->gotos
, ix
, g
);
1011 update_spot_bindings (scope
, &g
->goto_bindings
);
1015 /* Don't search beyond the current function. */
1016 if (s
== current_function_scope
)
1023 /* Set the TYPE_CONTEXT of all of TYPE's variants to CONTEXT. */
1026 set_type_context (tree type
, tree context
)
1028 for (type
= TYPE_MAIN_VARIANT (type
); type
;
1029 type
= TYPE_NEXT_VARIANT (type
))
1030 TYPE_CONTEXT (type
) = context
;
1033 /* Exit a scope. Restore the state of the identifier-decl mappings
1034 that were in effect when this scope was entered. Return a BLOCK
1035 node containing all the DECLs in this scope that are of interest
1036 to debug info generation. */
1041 struct c_scope
*scope
= current_scope
;
1042 tree block
, context
, p
;
1043 struct c_binding
*b
;
1045 bool functionbody
= scope
->function_body
;
1046 bool keep
= functionbody
|| scope
->keep
|| scope
->bindings
;
1048 update_label_decls (scope
);
1050 /* If appropriate, create a BLOCK to record the decls for the life
1051 of this function. */
1055 block
= make_node (BLOCK
);
1056 BLOCK_SUBBLOCKS (block
) = scope
->blocks
;
1057 TREE_USED (block
) = 1;
1059 /* In each subblock, record that this is its superior. */
1060 for (p
= scope
->blocks
; p
; p
= BLOCK_CHAIN (p
))
1061 BLOCK_SUPERCONTEXT (p
) = block
;
1063 BLOCK_VARS (block
) = 0;
1066 /* The TYPE_CONTEXTs for all of the tagged types belonging to this
1067 scope must be set so that they point to the appropriate
1068 construct, i.e. either to the current FUNCTION_DECL node, or
1069 else to the BLOCK node we just constructed.
1071 Note that for tagged types whose scope is just the formal
1072 parameter list for some function type specification, we can't
1073 properly set their TYPE_CONTEXTs here, because we don't have a
1074 pointer to the appropriate FUNCTION_TYPE node readily available
1075 to us. For those cases, the TYPE_CONTEXTs of the relevant tagged
1076 type nodes get set in `grokdeclarator' as soon as we have created
1077 the FUNCTION_TYPE node which will represent the "scope" for these
1078 "parameter list local" tagged types. */
1079 if (scope
->function_body
)
1080 context
= current_function_decl
;
1081 else if (scope
== file_scope
)
1083 tree file_decl
= build_decl (UNKNOWN_LOCATION
,
1084 TRANSLATION_UNIT_DECL
, 0, 0);
1085 TREE_CHAIN (file_decl
) = all_translation_units
;
1086 all_translation_units
= file_decl
;
1087 context
= file_decl
;
1092 /* Clear all bindings in this scope. */
1093 for (b
= scope
->bindings
; b
; b
= free_binding_and_advance (b
))
1096 switch (TREE_CODE (p
))
1099 /* Warnings for unused labels, errors for undefined labels. */
1100 if (TREE_USED (p
) && !DECL_INITIAL (p
))
1102 error ("label %q+D used but not defined", p
);
1103 DECL_INITIAL (p
) = error_mark_node
;
1106 warn_for_unused_label (p
);
1108 /* Labels go in BLOCK_VARS. */
1109 TREE_CHAIN (p
) = BLOCK_VARS (block
);
1110 BLOCK_VARS (block
) = p
;
1111 gcc_assert (I_LABEL_BINDING (b
->id
) == b
);
1112 I_LABEL_BINDING (b
->id
) = b
->shadowed
;
1114 /* Also pop back to the shadowed label_vars. */
1115 release_tree_vector (b
->u
.label
->decls_in_scope
);
1116 b
->u
.label
= b
->u
.label
->shadowed
;
1122 set_type_context (p
, context
);
1124 /* Types may not have tag-names, in which case the type
1125 appears in the bindings list with b->id NULL. */
1128 gcc_assert (I_TAG_BINDING (b
->id
) == b
);
1129 I_TAG_BINDING (b
->id
) = b
->shadowed
;
1134 /* Propagate TREE_ADDRESSABLE from nested functions to their
1135 containing functions. */
1136 if (!TREE_ASM_WRITTEN (p
)
1137 && DECL_INITIAL (p
) != 0
1138 && TREE_ADDRESSABLE (p
)
1139 && DECL_ABSTRACT_ORIGIN (p
) != 0
1140 && DECL_ABSTRACT_ORIGIN (p
) != p
)
1141 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (p
)) = 1;
1142 if (!DECL_EXTERNAL (p
)
1143 && !DECL_INITIAL (p
)
1144 && scope
!= file_scope
1145 && scope
!= external_scope
)
1147 error ("nested function %q+D declared but never defined", p
);
1148 undef_nested_function
= true;
1150 else if (DECL_DECLARED_INLINE_P (p
)
1152 && !DECL_INITIAL (p
))
1154 /* C99 6.7.4p6: "a function with external linkage... declared
1155 with an inline function specifier ... shall also be defined
1156 in the same translation unit." */
1157 if (!flag_gnu89_inline
)
1158 pedwarn (input_location
, 0,
1159 "inline function %q+D declared but never defined", p
);
1160 DECL_EXTERNAL (p
) = 1;
1166 /* Warnings for unused variables. */
1168 && !TREE_NO_WARNING (p
)
1169 && !DECL_IN_SYSTEM_HEADER (p
)
1171 && !DECL_ARTIFICIAL (p
)
1172 && scope
!= file_scope
1173 && scope
!= external_scope
)
1174 warning (OPT_Wunused_variable
, "unused variable %q+D", p
);
1178 error ("type of array %q+D completed incompatibly with"
1179 " implicit initialization", p
);
1186 /* All of these go in BLOCK_VARS, but only if this is the
1187 binding in the home scope. */
1190 TREE_CHAIN (p
) = BLOCK_VARS (block
);
1191 BLOCK_VARS (block
) = p
;
1193 else if (VAR_OR_FUNCTION_DECL_P (p
))
1195 /* For block local externs add a special
1196 DECL_EXTERNAL decl for debug info generation. */
1197 tree extp
= copy_node (p
);
1199 DECL_EXTERNAL (extp
) = 1;
1200 TREE_STATIC (extp
) = 0;
1201 TREE_PUBLIC (extp
) = 1;
1202 DECL_INITIAL (extp
) = NULL_TREE
;
1203 DECL_LANG_SPECIFIC (extp
) = NULL
;
1204 DECL_CONTEXT (extp
) = current_function_decl
;
1205 if (TREE_CODE (p
) == FUNCTION_DECL
)
1207 DECL_RESULT (extp
) = NULL_TREE
;
1208 DECL_SAVED_TREE (extp
) = NULL_TREE
;
1209 DECL_STRUCT_FUNCTION (extp
) = NULL
;
1211 if (b
->locus
!= UNKNOWN_LOCATION
)
1212 DECL_SOURCE_LOCATION (extp
) = b
->locus
;
1213 TREE_CHAIN (extp
) = BLOCK_VARS (block
);
1214 BLOCK_VARS (block
) = extp
;
1216 /* If this is the file scope, and we are processing more
1217 than one translation unit in this compilation, set
1218 DECL_CONTEXT of each decl to the TRANSLATION_UNIT_DECL.
1219 This makes same_translation_unit_p work, and causes
1220 static declarations to be given disambiguating suffixes. */
1221 if (scope
== file_scope
&& num_in_fnames
> 1)
1223 DECL_CONTEXT (p
) = context
;
1224 if (TREE_CODE (p
) == TYPE_DECL
)
1225 set_type_context (TREE_TYPE (p
), context
);
1229 /* Parameters go in DECL_ARGUMENTS, not BLOCK_VARS, and have
1230 already been put there by store_parm_decls. Unused-
1231 parameter warnings are handled by function.c.
1232 error_mark_node obviously does not go in BLOCK_VARS and
1233 does not get unused-variable warnings. */
1236 /* It is possible for a decl not to have a name. We get
1237 here with b->id NULL in this case. */
1240 gcc_assert (I_SYMBOL_BINDING (b
->id
) == b
);
1241 I_SYMBOL_BINDING (b
->id
) = b
->shadowed
;
1242 if (b
->shadowed
&& b
->shadowed
->u
.type
)
1243 TREE_TYPE (b
->shadowed
->decl
) = b
->shadowed
->u
.type
;
1253 /* Dispose of the block that we just made inside some higher level. */
1254 if ((scope
->function_body
|| scope
== file_scope
) && context
)
1256 DECL_INITIAL (context
) = block
;
1257 BLOCK_SUPERCONTEXT (block
) = context
;
1259 else if (scope
->outer
)
1262 SCOPE_LIST_APPEND (scope
->outer
, blocks
, block
);
1263 /* If we did not make a block for the scope just exited, any
1264 blocks made for inner scopes must be carried forward so they
1265 will later become subblocks of something else. */
1266 else if (scope
->blocks
)
1267 SCOPE_LIST_CONCAT (scope
->outer
, blocks
, scope
, blocks
);
1270 /* Pop the current scope, and free the structure for reuse. */
1271 current_scope
= scope
->outer
;
1272 if (scope
->function_body
)
1273 current_function_scope
= scope
->outer_function
;
1275 memset (scope
, 0, sizeof (struct c_scope
));
1276 scope
->outer
= scope_freelist
;
1277 scope_freelist
= scope
;
1283 push_file_scope (void)
1291 file_scope
= current_scope
;
1293 start_fname_decls ();
1295 for (decl
= visible_builtins
; decl
; decl
= TREE_CHAIN (decl
))
1296 bind (DECL_NAME (decl
), decl
, file_scope
,
1297 /*invisible=*/false, /*nested=*/true, DECL_SOURCE_LOCATION (decl
));
1301 pop_file_scope (void)
1303 /* In case there were missing closebraces, get us back to the global
1305 while (current_scope
!= file_scope
)
1308 /* __FUNCTION__ is defined at file scope (""). This
1309 call may not be necessary as my tests indicate it
1310 still works without it. */
1311 finish_fname_decls ();
1313 check_inline_statics ();
1315 /* This is the point to write out a PCH if we're doing that.
1316 In that case we do not want to do anything else. */
1319 c_common_write_pch ();
1323 /* Pop off the file scope and close this translation unit. */
1327 maybe_apply_pending_pragma_weaks ();
1330 /* Adjust the bindings for the start of a statement expression. */
1333 c_bindings_start_stmt_expr (struct c_spot_bindings
* switch_bindings
)
1335 struct c_scope
*scope
;
1337 for (scope
= current_scope
; scope
!= NULL
; scope
= scope
->outer
)
1339 struct c_binding
*b
;
1341 if (!scope
->has_label_bindings
)
1344 for (b
= scope
->bindings
; b
!= NULL
; b
= b
->prev
)
1346 struct c_label_vars
*label_vars
;
1348 struct c_goto_bindings
*g
;
1350 if (TREE_CODE (b
->decl
) != LABEL_DECL
)
1352 label_vars
= b
->u
.label
;
1353 ++label_vars
->label_bindings
.stmt_exprs
;
1355 VEC_iterate (c_goto_bindings_p
, label_vars
->gotos
, ix
, g
);
1357 ++g
->goto_bindings
.stmt_exprs
;
1361 if (switch_bindings
!= NULL
)
1362 ++switch_bindings
->stmt_exprs
;
1365 /* Adjust the bindings for the end of a statement expression. */
1368 c_bindings_end_stmt_expr (struct c_spot_bindings
*switch_bindings
)
1370 struct c_scope
*scope
;
1372 for (scope
= current_scope
; scope
!= NULL
; scope
= scope
->outer
)
1374 struct c_binding
*b
;
1376 if (!scope
->has_label_bindings
)
1379 for (b
= scope
->bindings
; b
!= NULL
; b
= b
->prev
)
1381 struct c_label_vars
*label_vars
;
1383 struct c_goto_bindings
*g
;
1385 if (TREE_CODE (b
->decl
) != LABEL_DECL
)
1387 label_vars
= b
->u
.label
;
1388 --label_vars
->label_bindings
.stmt_exprs
;
1389 if (label_vars
->label_bindings
.stmt_exprs
< 0)
1391 label_vars
->label_bindings
.left_stmt_expr
= true;
1392 label_vars
->label_bindings
.stmt_exprs
= 0;
1395 VEC_iterate (c_goto_bindings_p
, label_vars
->gotos
, ix
, g
);
1398 --g
->goto_bindings
.stmt_exprs
;
1399 if (g
->goto_bindings
.stmt_exprs
< 0)
1401 g
->goto_bindings
.left_stmt_expr
= true;
1402 g
->goto_bindings
.stmt_exprs
= 0;
1408 if (switch_bindings
!= NULL
)
1410 --switch_bindings
->stmt_exprs
;
1411 gcc_assert (switch_bindings
->stmt_exprs
>= 0);
1415 /* Push a definition or a declaration of struct, union or enum tag "name".
1416 "type" should be the type node.
1417 We assume that the tag "name" is not already defined, and has a location
1420 Note that the definition may really be just a forward reference.
1421 In that case, the TYPE_SIZE will be zero. */
1424 pushtag (location_t loc
, tree name
, tree type
)
1426 /* Record the identifier as the type's name if it has none. */
1427 if (name
&& !TYPE_NAME (type
))
1428 TYPE_NAME (type
) = name
;
1429 bind (name
, type
, current_scope
, /*invisible=*/false, /*nested=*/false, loc
);
1431 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1432 tagged type we just added to the current scope. This fake
1433 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1434 to output a representation of a tagged type, and it also gives
1435 us a convenient place to record the "scope start" address for the
1438 TYPE_STUB_DECL (type
) = pushdecl (build_decl (loc
,
1439 TYPE_DECL
, NULL_TREE
, type
));
1441 /* An approximation for now, so we can tell this is a function-scope tag.
1442 This will be updated in pop_scope. */
1443 TYPE_CONTEXT (type
) = DECL_CONTEXT (TYPE_STUB_DECL (type
));
1445 if (warn_cxx_compat
&& name
!= NULL_TREE
)
1447 struct c_binding
*b
= I_SYMBOL_BINDING (name
);
1450 && b
->decl
!= NULL_TREE
1451 && TREE_CODE (b
->decl
) == TYPE_DECL
1452 && (B_IN_CURRENT_SCOPE (b
)
1453 || (current_scope
== file_scope
&& B_IN_EXTERNAL_SCOPE (b
)))
1454 && (TYPE_MAIN_VARIANT (TREE_TYPE (b
->decl
))
1455 != TYPE_MAIN_VARIANT (type
)))
1457 warning_at (loc
, OPT_Wc___compat
,
1458 ("using %qD as both a typedef and a tag is "
1461 if (b
->locus
!= UNKNOWN_LOCATION
)
1462 inform (b
->locus
, "originally defined here");
1467 /* Subroutine of compare_decls. Allow harmless mismatches in return
1468 and argument types provided that the type modes match. This function
1469 return a unified type given a suitable match, and 0 otherwise. */
1472 match_builtin_function_types (tree newtype
, tree oldtype
)
1474 tree newrettype
, oldrettype
;
1475 tree newargs
, oldargs
;
1476 tree trytype
, tryargs
;
1478 /* Accept the return type of the new declaration if same modes. */
1479 oldrettype
= TREE_TYPE (oldtype
);
1480 newrettype
= TREE_TYPE (newtype
);
1482 if (TYPE_MODE (oldrettype
) != TYPE_MODE (newrettype
))
1485 oldargs
= TYPE_ARG_TYPES (oldtype
);
1486 newargs
= TYPE_ARG_TYPES (newtype
);
1489 while (oldargs
|| newargs
)
1493 || !TREE_VALUE (oldargs
)
1494 || !TREE_VALUE (newargs
)
1495 || TYPE_MODE (TREE_VALUE (oldargs
))
1496 != TYPE_MODE (TREE_VALUE (newargs
)))
1499 oldargs
= TREE_CHAIN (oldargs
);
1500 newargs
= TREE_CHAIN (newargs
);
1503 trytype
= build_function_type (newrettype
, tryargs
);
1504 return build_type_attribute_variant (trytype
, TYPE_ATTRIBUTES (oldtype
));
1507 /* Subroutine of diagnose_mismatched_decls. Check for function type
1508 mismatch involving an empty arglist vs a nonempty one and give clearer
1511 diagnose_arglist_conflict (tree newdecl
, tree olddecl
,
1512 tree newtype
, tree oldtype
)
1516 if (TREE_CODE (olddecl
) != FUNCTION_DECL
1517 || !comptypes (TREE_TYPE (oldtype
), TREE_TYPE (newtype
))
1518 || !((TYPE_ARG_TYPES (oldtype
) == 0 && DECL_INITIAL (olddecl
) == 0)
1520 (TYPE_ARG_TYPES (newtype
) == 0 && DECL_INITIAL (newdecl
) == 0)))
1523 t
= TYPE_ARG_TYPES (oldtype
);
1525 t
= TYPE_ARG_TYPES (newtype
);
1526 for (; t
; t
= TREE_CHAIN (t
))
1528 tree type
= TREE_VALUE (t
);
1530 if (TREE_CHAIN (t
) == 0
1531 && TYPE_MAIN_VARIANT (type
) != void_type_node
)
1533 inform (input_location
, "a parameter list with an ellipsis can%'t match "
1534 "an empty parameter name list declaration");
1538 if (c_type_promotes_to (type
) != type
)
1540 inform (input_location
, "an argument type that has a default promotion can%'t match "
1541 "an empty parameter name list declaration");
1547 /* Another subroutine of diagnose_mismatched_decls. OLDDECL is an
1548 old-style function definition, NEWDECL is a prototype declaration.
1549 Diagnose inconsistencies in the argument list. Returns TRUE if
1550 the prototype is compatible, FALSE if not. */
1552 validate_proto_after_old_defn (tree newdecl
, tree newtype
, tree oldtype
)
1554 tree newargs
, oldargs
;
1557 #define END_OF_ARGLIST(t) ((t) == void_type_node)
1559 oldargs
= TYPE_ACTUAL_ARG_TYPES (oldtype
);
1560 newargs
= TYPE_ARG_TYPES (newtype
);
1565 tree oldargtype
= TREE_VALUE (oldargs
);
1566 tree newargtype
= TREE_VALUE (newargs
);
1568 if (oldargtype
== error_mark_node
|| newargtype
== error_mark_node
)
1571 oldargtype
= TYPE_MAIN_VARIANT (oldargtype
);
1572 newargtype
= TYPE_MAIN_VARIANT (newargtype
);
1574 if (END_OF_ARGLIST (oldargtype
) && END_OF_ARGLIST (newargtype
))
1577 /* Reaching the end of just one list means the two decls don't
1578 agree on the number of arguments. */
1579 if (END_OF_ARGLIST (oldargtype
))
1581 error ("prototype for %q+D declares more arguments "
1582 "than previous old-style definition", newdecl
);
1585 else if (END_OF_ARGLIST (newargtype
))
1587 error ("prototype for %q+D declares fewer arguments "
1588 "than previous old-style definition", newdecl
);
1592 /* Type for passing arg must be consistent with that declared
1594 else if (!comptypes (oldargtype
, newargtype
))
1596 error ("prototype for %q+D declares argument %d"
1597 " with incompatible type",
1602 oldargs
= TREE_CHAIN (oldargs
);
1603 newargs
= TREE_CHAIN (newargs
);
1607 /* If we get here, no errors were found, but do issue a warning
1608 for this poor-style construct. */
1609 warning (0, "prototype for %q+D follows non-prototype definition",
1612 #undef END_OF_ARGLIST
1615 /* Subroutine of diagnose_mismatched_decls. Report the location of DECL,
1616 first in a pair of mismatched declarations, using the diagnostic
1619 locate_old_decl (tree decl
)
1621 if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_BUILT_IN (decl
))
1623 else if (DECL_INITIAL (decl
))
1624 inform (input_location
, "previous definition of %q+D was here", decl
);
1625 else if (C_DECL_IMPLICIT (decl
))
1626 inform (input_location
, "previous implicit declaration of %q+D was here", decl
);
1628 inform (input_location
, "previous declaration of %q+D was here", decl
);
1631 /* Subroutine of duplicate_decls. Compare NEWDECL to OLDDECL.
1632 Returns true if the caller should proceed to merge the two, false
1633 if OLDDECL should simply be discarded. As a side effect, issues
1634 all necessary diagnostics for invalid or poor-style combinations.
1635 If it returns true, writes the types of NEWDECL and OLDDECL to
1636 *NEWTYPEP and *OLDTYPEP - these may have been adjusted from
1637 TREE_TYPE (NEWDECL, OLDDECL) respectively. */
1640 diagnose_mismatched_decls (tree newdecl
, tree olddecl
,
1641 tree
*newtypep
, tree
*oldtypep
)
1643 tree newtype
, oldtype
;
1644 bool pedwarned
= false;
1645 bool warned
= false;
1648 #define DECL_EXTERN_INLINE(DECL) (DECL_DECLARED_INLINE_P (DECL) \
1649 && DECL_EXTERNAL (DECL))
1651 /* If we have error_mark_node for either decl or type, just discard
1652 the previous decl - we're in an error cascade already. */
1653 if (olddecl
== error_mark_node
|| newdecl
== error_mark_node
)
1655 *oldtypep
= oldtype
= TREE_TYPE (olddecl
);
1656 *newtypep
= newtype
= TREE_TYPE (newdecl
);
1657 if (oldtype
== error_mark_node
|| newtype
== error_mark_node
)
1660 /* Two different categories of symbol altogether. This is an error
1661 unless OLDDECL is a builtin. OLDDECL will be discarded in any case. */
1662 if (TREE_CODE (olddecl
) != TREE_CODE (newdecl
))
1664 if (!(TREE_CODE (olddecl
) == FUNCTION_DECL
1665 && DECL_BUILT_IN (olddecl
)
1666 && !C_DECL_DECLARED_BUILTIN (olddecl
)))
1668 error ("%q+D redeclared as different kind of symbol", newdecl
);
1669 locate_old_decl (olddecl
);
1671 else if (TREE_PUBLIC (newdecl
))
1672 warning (0, "built-in function %q+D declared as non-function",
1675 warning (OPT_Wshadow
, "declaration of %q+D shadows "
1676 "a built-in function", newdecl
);
1680 /* Enumerators have no linkage, so may only be declared once in a
1682 if (TREE_CODE (olddecl
) == CONST_DECL
)
1684 error ("redeclaration of enumerator %q+D", newdecl
);
1685 locate_old_decl (olddecl
);
1689 if (!comptypes (oldtype
, newtype
))
1691 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1692 && DECL_BUILT_IN (olddecl
) && !C_DECL_DECLARED_BUILTIN (olddecl
))
1694 /* Accept harmless mismatch in function types.
1695 This is for the ffs and fprintf builtins. */
1696 tree trytype
= match_builtin_function_types (newtype
, oldtype
);
1698 if (trytype
&& comptypes (newtype
, trytype
))
1699 *oldtypep
= oldtype
= trytype
;
1702 /* If types don't match for a built-in, throw away the
1703 built-in. No point in calling locate_old_decl here, it
1704 won't print anything. */
1705 warning (0, "conflicting types for built-in function %q+D",
1710 else if (TREE_CODE (olddecl
) == FUNCTION_DECL
1711 && DECL_IS_BUILTIN (olddecl
))
1713 /* A conflicting function declaration for a predeclared
1714 function that isn't actually built in. Objective C uses
1715 these. The new declaration silently overrides everything
1716 but the volatility (i.e. noreturn) indication. See also
1717 below. FIXME: Make Objective C use normal builtins. */
1718 TREE_THIS_VOLATILE (newdecl
) |= TREE_THIS_VOLATILE (olddecl
);
1721 /* Permit void foo (...) to match int foo (...) if the latter is
1722 the definition and implicit int was used. See
1723 c-torture/compile/920625-2.c. */
1724 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
&& DECL_INITIAL (newdecl
)
1725 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype
)) == void_type_node
1726 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype
)) == integer_type_node
1727 && C_FUNCTION_IMPLICIT_INT (newdecl
) && !DECL_INITIAL (olddecl
))
1729 pedwarned
= pedwarn (input_location
, 0,
1730 "conflicting types for %q+D", newdecl
);
1731 /* Make sure we keep void as the return type. */
1732 TREE_TYPE (newdecl
) = *newtypep
= newtype
= oldtype
;
1733 C_FUNCTION_IMPLICIT_INT (newdecl
) = 0;
1735 /* Permit void foo (...) to match an earlier call to foo (...) with
1736 no declared type (thus, implicitly int). */
1737 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
1738 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype
)) == void_type_node
1739 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype
)) == integer_type_node
1740 && C_DECL_IMPLICIT (olddecl
) && !DECL_INITIAL (olddecl
))
1742 pedwarned
= pedwarn (input_location
, 0,
1743 "conflicting types for %q+D", newdecl
);
1744 /* Make sure we keep void as the return type. */
1745 TREE_TYPE (olddecl
) = *oldtypep
= oldtype
= newtype
;
1749 int new_quals
= TYPE_QUALS (newtype
);
1750 int old_quals
= TYPE_QUALS (oldtype
);
1752 if (new_quals
!= old_quals
)
1754 addr_space_t new_addr
= DECODE_QUAL_ADDR_SPACE (new_quals
);
1755 addr_space_t old_addr
= DECODE_QUAL_ADDR_SPACE (old_quals
);
1756 if (new_addr
!= old_addr
)
1758 if (ADDR_SPACE_GENERIC_P (new_addr
))
1759 error ("conflicting named address spaces (generic vs %s) "
1761 c_addr_space_name (old_addr
), newdecl
);
1762 else if (ADDR_SPACE_GENERIC_P (old_addr
))
1763 error ("conflicting named address spaces (%s vs generic) "
1765 c_addr_space_name (new_addr
), newdecl
);
1767 error ("conflicting named address spaces (%s vs %s) "
1769 c_addr_space_name (new_addr
),
1770 c_addr_space_name (old_addr
),
1774 if (CLEAR_QUAL_ADDR_SPACE (new_quals
)
1775 != CLEAR_QUAL_ADDR_SPACE (old_quals
))
1776 error ("conflicting type qualifiers for %q+D", newdecl
);
1779 error ("conflicting types for %q+D", newdecl
);
1780 diagnose_arglist_conflict (newdecl
, olddecl
, newtype
, oldtype
);
1781 locate_old_decl (olddecl
);
1786 /* Redeclaration of a type is a constraint violation (6.7.2.3p1),
1787 but silently ignore the redeclaration if either is in a system
1788 header. (Conflicting redeclarations were handled above.) */
1789 if (TREE_CODE (newdecl
) == TYPE_DECL
)
1791 if (DECL_IN_SYSTEM_HEADER (newdecl
)
1792 || DECL_IN_SYSTEM_HEADER (olddecl
)
1793 || TREE_NO_WARNING (newdecl
)
1794 || TREE_NO_WARNING (olddecl
))
1795 return true; /* Allow OLDDECL to continue in use. */
1797 error ("redefinition of typedef %q+D", newdecl
);
1798 locate_old_decl (olddecl
);
1802 /* Function declarations can either be 'static' or 'extern' (no
1803 qualifier is equivalent to 'extern' - C99 6.2.2p5) and therefore
1804 can never conflict with each other on account of linkage
1805 (6.2.2p4). Multiple definitions are not allowed (6.9p3,5) but
1806 gnu89 mode permits two definitions if one is 'extern inline' and
1807 one is not. The non- extern-inline definition supersedes the
1808 extern-inline definition. */
1810 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1812 /* If you declare a built-in function name as static, or
1813 define the built-in with an old-style definition (so we
1814 can't validate the argument list) the built-in definition is
1815 overridden, but optionally warn this was a bad choice of name. */
1816 if (DECL_BUILT_IN (olddecl
)
1817 && !C_DECL_DECLARED_BUILTIN (olddecl
)
1818 && (!TREE_PUBLIC (newdecl
)
1819 || (DECL_INITIAL (newdecl
)
1820 && !TYPE_ARG_TYPES (TREE_TYPE (newdecl
)))))
1822 warning (OPT_Wshadow
, "declaration of %q+D shadows "
1823 "a built-in function", newdecl
);
1824 /* Discard the old built-in function. */
1828 if (DECL_INITIAL (newdecl
))
1830 if (DECL_INITIAL (olddecl
))
1832 /* If both decls are in the same TU and the new declaration
1833 isn't overriding an extern inline reject the new decl.
1834 In c99, no overriding is allowed in the same translation
1836 if ((!DECL_EXTERN_INLINE (olddecl
)
1837 || DECL_EXTERN_INLINE (newdecl
)
1838 || (!flag_gnu89_inline
1839 && (!DECL_DECLARED_INLINE_P (olddecl
)
1840 || !lookup_attribute ("gnu_inline",
1841 DECL_ATTRIBUTES (olddecl
)))
1842 && (!DECL_DECLARED_INLINE_P (newdecl
)
1843 || !lookup_attribute ("gnu_inline",
1844 DECL_ATTRIBUTES (newdecl
))))
1846 && same_translation_unit_p (newdecl
, olddecl
))
1848 error ("redefinition of %q+D", newdecl
);
1849 locate_old_decl (olddecl
);
1854 /* If we have a prototype after an old-style function definition,
1855 the argument types must be checked specially. */
1856 else if (DECL_INITIAL (olddecl
)
1857 && !TYPE_ARG_TYPES (oldtype
) && TYPE_ARG_TYPES (newtype
)
1858 && TYPE_ACTUAL_ARG_TYPES (oldtype
)
1859 && !validate_proto_after_old_defn (newdecl
, newtype
, oldtype
))
1861 locate_old_decl (olddecl
);
1864 /* A non-static declaration (even an "extern") followed by a
1865 static declaration is undefined behavior per C99 6.2.2p3-5,7.
1866 The same is true for a static forward declaration at block
1867 scope followed by a non-static declaration/definition at file
1868 scope. Static followed by non-static at the same scope is
1869 not undefined behavior, and is the most convenient way to get
1870 some effects (see e.g. what unwind-dw2-fde-glibc.c does to
1871 the definition of _Unwind_Find_FDE in unwind-dw2-fde.c), but
1872 we do diagnose it if -Wtraditional. */
1873 if (TREE_PUBLIC (olddecl
) && !TREE_PUBLIC (newdecl
))
1875 /* Two exceptions to the rule. If olddecl is an extern
1876 inline, or a predeclared function that isn't actually
1877 built in, newdecl silently overrides olddecl. The latter
1878 occur only in Objective C; see also above. (FIXME: Make
1879 Objective C use normal builtins.) */
1880 if (!DECL_IS_BUILTIN (olddecl
)
1881 && !DECL_EXTERN_INLINE (olddecl
))
1883 error ("static declaration of %q+D follows "
1884 "non-static declaration", newdecl
);
1885 locate_old_decl (olddecl
);
1889 else if (TREE_PUBLIC (newdecl
) && !TREE_PUBLIC (olddecl
))
1891 if (DECL_CONTEXT (olddecl
))
1893 error ("non-static declaration of %q+D follows "
1894 "static declaration", newdecl
);
1895 locate_old_decl (olddecl
);
1898 else if (warn_traditional
)
1900 warned
|= warning (OPT_Wtraditional
,
1901 "non-static declaration of %q+D "
1902 "follows static declaration", newdecl
);
1906 /* Make sure gnu_inline attribute is either not present, or
1907 present on all inline decls. */
1908 if (DECL_DECLARED_INLINE_P (olddecl
)
1909 && DECL_DECLARED_INLINE_P (newdecl
))
1911 bool newa
= lookup_attribute ("gnu_inline",
1912 DECL_ATTRIBUTES (newdecl
)) != NULL
;
1913 bool olda
= lookup_attribute ("gnu_inline",
1914 DECL_ATTRIBUTES (olddecl
)) != NULL
;
1917 error_at (input_location
, "%<gnu_inline%> attribute present on %q+D",
1918 newa
? newdecl
: olddecl
);
1919 error_at (DECL_SOURCE_LOCATION (newa
? olddecl
: newdecl
),
1924 else if (TREE_CODE (newdecl
) == VAR_DECL
)
1926 /* Only variables can be thread-local, and all declarations must
1927 agree on this property. */
1928 if (C_DECL_THREADPRIVATE_P (olddecl
) && !DECL_THREAD_LOCAL_P (newdecl
))
1930 /* Nothing to check. Since OLDDECL is marked threadprivate
1931 and NEWDECL does not have a thread-local attribute, we
1932 will merge the threadprivate attribute into NEWDECL. */
1935 else if (DECL_THREAD_LOCAL_P (newdecl
) != DECL_THREAD_LOCAL_P (olddecl
))
1937 if (DECL_THREAD_LOCAL_P (newdecl
))
1938 error ("thread-local declaration of %q+D follows "
1939 "non-thread-local declaration", newdecl
);
1941 error ("non-thread-local declaration of %q+D follows "
1942 "thread-local declaration", newdecl
);
1944 locate_old_decl (olddecl
);
1948 /* Multiple initialized definitions are not allowed (6.9p3,5). */
1949 if (DECL_INITIAL (newdecl
) && DECL_INITIAL (olddecl
))
1951 error ("redefinition of %q+D", newdecl
);
1952 locate_old_decl (olddecl
);
1956 /* Objects declared at file scope: if the first declaration had
1957 external linkage (even if it was an external reference) the
1958 second must have external linkage as well, or the behavior is
1959 undefined. If the first declaration had internal linkage, then
1960 the second must too, or else be an external reference (in which
1961 case the composite declaration still has internal linkage).
1962 As for function declarations, we warn about the static-then-
1963 extern case only for -Wtraditional. See generally 6.2.2p3-5,7. */
1964 if (DECL_FILE_SCOPE_P (newdecl
)
1965 && TREE_PUBLIC (newdecl
) != TREE_PUBLIC (olddecl
))
1967 if (DECL_EXTERNAL (newdecl
))
1969 if (!DECL_FILE_SCOPE_P (olddecl
))
1971 error ("extern declaration of %q+D follows "
1972 "declaration with no linkage", newdecl
);
1973 locate_old_decl (olddecl
);
1976 else if (warn_traditional
)
1978 warned
|= warning (OPT_Wtraditional
,
1979 "non-static declaration of %q+D "
1980 "follows static declaration", newdecl
);
1985 if (TREE_PUBLIC (newdecl
))
1986 error ("non-static declaration of %q+D follows "
1987 "static declaration", newdecl
);
1989 error ("static declaration of %q+D follows "
1990 "non-static declaration", newdecl
);
1992 locate_old_decl (olddecl
);
1996 /* Two objects with the same name declared at the same block
1997 scope must both be external references (6.7p3). */
1998 else if (!DECL_FILE_SCOPE_P (newdecl
))
2000 if (DECL_EXTERNAL (newdecl
))
2002 /* Extern with initializer at block scope, which will
2003 already have received an error. */
2005 else if (DECL_EXTERNAL (olddecl
))
2007 error ("declaration of %q+D with no linkage follows "
2008 "extern declaration", newdecl
);
2009 locate_old_decl (olddecl
);
2013 error ("redeclaration of %q+D with no linkage", newdecl
);
2014 locate_old_decl (olddecl
);
2020 /* C++ does not permit a decl to appear multiple times at file
2023 && DECL_FILE_SCOPE_P (newdecl
)
2024 && !DECL_EXTERNAL (newdecl
)
2025 && !DECL_EXTERNAL (olddecl
))
2026 warned
|= warning_at (DECL_SOURCE_LOCATION (newdecl
),
2028 ("duplicate declaration of %qD is "
2034 /* All decls must agree on a visibility. */
2035 if (CODE_CONTAINS_STRUCT (TREE_CODE (newdecl
), TS_DECL_WITH_VIS
)
2036 && DECL_VISIBILITY_SPECIFIED (newdecl
) && DECL_VISIBILITY_SPECIFIED (olddecl
)
2037 && DECL_VISIBILITY (newdecl
) != DECL_VISIBILITY (olddecl
))
2039 warned
|= warning (0, "redeclaration of %q+D with different visibility "
2040 "(old visibility preserved)", newdecl
);
2043 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2045 /* Diagnose inline __attribute__ ((noinline)) which is silly. */
2046 if (DECL_DECLARED_INLINE_P (newdecl
)
2047 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl
)))
2049 warned
|= warning (OPT_Wattributes
,
2050 "inline declaration of %qD follows "
2051 "declaration with attribute noinline", newdecl
);
2053 else if (DECL_DECLARED_INLINE_P (olddecl
)
2054 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl
)))
2056 warned
|= warning (OPT_Wattributes
,
2057 "declaration of %q+D with attribute "
2058 "noinline follows inline declaration ", newdecl
);
2061 else /* PARM_DECL, VAR_DECL */
2063 /* Redeclaration of a parameter is a constraint violation (this is
2064 not explicitly stated, but follows from C99 6.7p3 [no more than
2065 one declaration of the same identifier with no linkage in the
2066 same scope, except type tags] and 6.2.2p6 [parameters have no
2067 linkage]). We must check for a forward parameter declaration,
2068 indicated by TREE_ASM_WRITTEN on the old declaration - this is
2069 an extension, the mandatory diagnostic for which is handled by
2070 mark_forward_parm_decls. */
2072 if (TREE_CODE (newdecl
) == PARM_DECL
2073 && (!TREE_ASM_WRITTEN (olddecl
) || TREE_ASM_WRITTEN (newdecl
)))
2075 error ("redefinition of parameter %q+D", newdecl
);
2076 locate_old_decl (olddecl
);
2081 /* Optional warning for completely redundant decls. */
2082 if (!warned
&& !pedwarned
2083 && warn_redundant_decls
2084 /* Don't warn about a function declaration followed by a
2086 && !(TREE_CODE (newdecl
) == FUNCTION_DECL
2087 && DECL_INITIAL (newdecl
) && !DECL_INITIAL (olddecl
))
2088 /* Don't warn about redundant redeclarations of builtins. */
2089 && !(TREE_CODE (newdecl
) == FUNCTION_DECL
2090 && !DECL_BUILT_IN (newdecl
)
2091 && DECL_BUILT_IN (olddecl
)
2092 && !C_DECL_DECLARED_BUILTIN (olddecl
))
2093 /* Don't warn about an extern followed by a definition. */
2094 && !(DECL_EXTERNAL (olddecl
) && !DECL_EXTERNAL (newdecl
))
2095 /* Don't warn about forward parameter decls. */
2096 && !(TREE_CODE (newdecl
) == PARM_DECL
2097 && TREE_ASM_WRITTEN (olddecl
) && !TREE_ASM_WRITTEN (newdecl
))
2098 /* Don't warn about a variable definition following a declaration. */
2099 && !(TREE_CODE (newdecl
) == VAR_DECL
2100 && DECL_INITIAL (newdecl
) && !DECL_INITIAL (olddecl
)))
2102 warned
= warning (OPT_Wredundant_decls
, "redundant redeclaration of %q+D",
2106 /* Report location of previous decl/defn. */
2107 if (warned
|| pedwarned
)
2108 locate_old_decl (olddecl
);
2110 #undef DECL_EXTERN_INLINE
2115 /* Subroutine of duplicate_decls. NEWDECL has been found to be
2116 consistent with OLDDECL, but carries new information. Merge the
2117 new information into OLDDECL. This function issues no
2121 merge_decls (tree newdecl
, tree olddecl
, tree newtype
, tree oldtype
)
2123 bool new_is_definition
= (TREE_CODE (newdecl
) == FUNCTION_DECL
2124 && DECL_INITIAL (newdecl
) != 0);
2125 bool new_is_prototype
= (TREE_CODE (newdecl
) == FUNCTION_DECL
2126 && TYPE_ARG_TYPES (TREE_TYPE (newdecl
)) != 0);
2127 bool old_is_prototype
= (TREE_CODE (olddecl
) == FUNCTION_DECL
2128 && TYPE_ARG_TYPES (TREE_TYPE (olddecl
)) != 0);
2129 bool extern_changed
= false;
2131 /* For real parm decl following a forward decl, rechain the old decl
2132 in its new location and clear TREE_ASM_WRITTEN (it's not a
2133 forward decl anymore). */
2134 if (TREE_CODE (newdecl
) == PARM_DECL
2135 && TREE_ASM_WRITTEN (olddecl
) && !TREE_ASM_WRITTEN (newdecl
))
2137 struct c_binding
*b
, **here
;
2139 for (here
= ¤t_scope
->bindings
; *here
; here
= &(*here
)->prev
)
2140 if ((*here
)->decl
== olddecl
)
2147 b
->prev
= current_scope
->bindings
;
2148 current_scope
->bindings
= b
;
2150 TREE_ASM_WRITTEN (olddecl
) = 0;
2153 DECL_ATTRIBUTES (newdecl
)
2154 = targetm
.merge_decl_attributes (olddecl
, newdecl
);
2156 /* Merge the data types specified in the two decls. */
2158 = TREE_TYPE (olddecl
)
2159 = composite_type (newtype
, oldtype
);
2161 /* Lay the type out, unless already done. */
2162 if (!comptypes (oldtype
, TREE_TYPE (newdecl
)))
2164 if (TREE_TYPE (newdecl
) != error_mark_node
)
2165 layout_type (TREE_TYPE (newdecl
));
2166 if (TREE_CODE (newdecl
) != FUNCTION_DECL
2167 && TREE_CODE (newdecl
) != TYPE_DECL
2168 && TREE_CODE (newdecl
) != CONST_DECL
)
2169 layout_decl (newdecl
, 0);
2173 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
2174 DECL_SIZE (newdecl
) = DECL_SIZE (olddecl
);
2175 DECL_SIZE_UNIT (newdecl
) = DECL_SIZE_UNIT (olddecl
);
2176 DECL_MODE (newdecl
) = DECL_MODE (olddecl
);
2177 if (DECL_ALIGN (olddecl
) > DECL_ALIGN (newdecl
))
2179 DECL_ALIGN (newdecl
) = DECL_ALIGN (olddecl
);
2180 DECL_USER_ALIGN (newdecl
) |= DECL_USER_ALIGN (olddecl
);
2184 /* Keep the old rtl since we can safely use it. */
2185 if (HAS_RTL_P (olddecl
))
2186 COPY_DECL_RTL (olddecl
, newdecl
);
2188 /* Merge the type qualifiers. */
2189 if (TREE_READONLY (newdecl
))
2190 TREE_READONLY (olddecl
) = 1;
2192 if (TREE_THIS_VOLATILE (newdecl
))
2193 TREE_THIS_VOLATILE (olddecl
) = 1;
2195 /* Merge deprecatedness. */
2196 if (TREE_DEPRECATED (newdecl
))
2197 TREE_DEPRECATED (olddecl
) = 1;
2199 /* If a decl is in a system header and the other isn't, keep the one on the
2200 system header. Otherwise, keep source location of definition rather than
2201 declaration and of prototype rather than non-prototype unless that
2202 prototype is built-in. */
2203 if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl
), TS_DECL_WITH_VIS
)
2204 && DECL_IN_SYSTEM_HEADER (olddecl
)
2205 && !DECL_IN_SYSTEM_HEADER (newdecl
) )
2206 DECL_SOURCE_LOCATION (newdecl
) = DECL_SOURCE_LOCATION (olddecl
);
2207 else if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl
), TS_DECL_WITH_VIS
)
2208 && DECL_IN_SYSTEM_HEADER (newdecl
)
2209 && !DECL_IN_SYSTEM_HEADER (olddecl
))
2210 DECL_SOURCE_LOCATION (olddecl
) = DECL_SOURCE_LOCATION (newdecl
);
2211 else if ((DECL_INITIAL (newdecl
) == 0 && DECL_INITIAL (olddecl
) != 0)
2212 || (old_is_prototype
&& !new_is_prototype
2213 && !C_DECL_BUILTIN_PROTOTYPE (olddecl
)))
2214 DECL_SOURCE_LOCATION (newdecl
) = DECL_SOURCE_LOCATION (olddecl
);
2216 /* Merge the initialization information. */
2217 if (DECL_INITIAL (newdecl
) == 0)
2218 DECL_INITIAL (newdecl
) = DECL_INITIAL (olddecl
);
2220 /* Merge the threadprivate attribute. */
2221 if (TREE_CODE (olddecl
) == VAR_DECL
&& C_DECL_THREADPRIVATE_P (olddecl
))
2223 DECL_TLS_MODEL (newdecl
) = DECL_TLS_MODEL (olddecl
);
2224 C_DECL_THREADPRIVATE_P (newdecl
) = 1;
2227 if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl
), TS_DECL_WITH_VIS
))
2229 /* Merge the section attribute.
2230 We want to issue an error if the sections conflict but that
2231 must be done later in decl_attributes since we are called
2232 before attributes are assigned. */
2233 if (DECL_SECTION_NAME (newdecl
) == NULL_TREE
)
2234 DECL_SECTION_NAME (newdecl
) = DECL_SECTION_NAME (olddecl
);
2236 /* Copy the assembler name.
2237 Currently, it can only be defined in the prototype. */
2238 COPY_DECL_ASSEMBLER_NAME (olddecl
, newdecl
);
2240 /* Use visibility of whichever declaration had it specified */
2241 if (DECL_VISIBILITY_SPECIFIED (olddecl
))
2243 DECL_VISIBILITY (newdecl
) = DECL_VISIBILITY (olddecl
);
2244 DECL_VISIBILITY_SPECIFIED (newdecl
) = 1;
2247 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2249 DECL_STATIC_CONSTRUCTOR(newdecl
) |= DECL_STATIC_CONSTRUCTOR(olddecl
);
2250 DECL_STATIC_DESTRUCTOR (newdecl
) |= DECL_STATIC_DESTRUCTOR (olddecl
);
2251 DECL_NO_LIMIT_STACK (newdecl
) |= DECL_NO_LIMIT_STACK (olddecl
);
2252 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl
)
2253 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl
);
2254 TREE_THIS_VOLATILE (newdecl
) |= TREE_THIS_VOLATILE (olddecl
);
2255 DECL_IS_MALLOC (newdecl
) |= DECL_IS_MALLOC (olddecl
);
2256 DECL_IS_OPERATOR_NEW (newdecl
) |= DECL_IS_OPERATOR_NEW (olddecl
);
2257 TREE_READONLY (newdecl
) |= TREE_READONLY (olddecl
);
2258 DECL_PURE_P (newdecl
) |= DECL_PURE_P (olddecl
);
2259 DECL_IS_NOVOPS (newdecl
) |= DECL_IS_NOVOPS (olddecl
);
2262 /* Merge the storage class information. */
2263 merge_weak (newdecl
, olddecl
);
2265 /* For functions, static overrides non-static. */
2266 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2268 TREE_PUBLIC (newdecl
) &= TREE_PUBLIC (olddecl
);
2269 /* This is since we don't automatically
2270 copy the attributes of NEWDECL into OLDDECL. */
2271 TREE_PUBLIC (olddecl
) = TREE_PUBLIC (newdecl
);
2272 /* If this clears `static', clear it in the identifier too. */
2273 if (!TREE_PUBLIC (olddecl
))
2274 TREE_PUBLIC (DECL_NAME (olddecl
)) = 0;
2278 /* In c99, 'extern' declaration before (or after) 'inline' means this
2279 function is not DECL_EXTERNAL, unless 'gnu_inline' attribute
2281 if (TREE_CODE (newdecl
) == FUNCTION_DECL
2282 && !flag_gnu89_inline
2283 && (DECL_DECLARED_INLINE_P (newdecl
)
2284 || DECL_DECLARED_INLINE_P (olddecl
))
2285 && (!DECL_DECLARED_INLINE_P (newdecl
)
2286 || !DECL_DECLARED_INLINE_P (olddecl
)
2287 || !DECL_EXTERNAL (olddecl
))
2288 && DECL_EXTERNAL (newdecl
)
2289 && !lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (newdecl
))
2290 && !current_function_decl
)
2291 DECL_EXTERNAL (newdecl
) = 0;
2293 if (DECL_EXTERNAL (newdecl
))
2295 TREE_STATIC (newdecl
) = TREE_STATIC (olddecl
);
2296 DECL_EXTERNAL (newdecl
) = DECL_EXTERNAL (olddecl
);
2298 /* An extern decl does not override previous storage class. */
2299 TREE_PUBLIC (newdecl
) = TREE_PUBLIC (olddecl
);
2300 if (!DECL_EXTERNAL (newdecl
))
2302 DECL_CONTEXT (newdecl
) = DECL_CONTEXT (olddecl
);
2303 DECL_COMMON (newdecl
) = DECL_COMMON (olddecl
);
2308 TREE_STATIC (olddecl
) = TREE_STATIC (newdecl
);
2309 TREE_PUBLIC (olddecl
) = TREE_PUBLIC (newdecl
);
2312 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2314 /* If we're redefining a function previously defined as extern
2315 inline, make sure we emit debug info for the inline before we
2316 throw it away, in case it was inlined into a function that
2317 hasn't been written out yet. */
2318 if (new_is_definition
&& DECL_INITIAL (olddecl
))
2319 /* The new defn must not be inline. */
2320 DECL_UNINLINABLE (newdecl
) = 1;
2323 /* If either decl says `inline', this fn is inline, unless
2324 its definition was passed already. */
2325 if (DECL_DECLARED_INLINE_P (newdecl
)
2326 || DECL_DECLARED_INLINE_P (olddecl
))
2327 DECL_DECLARED_INLINE_P (newdecl
) = 1;
2329 DECL_UNINLINABLE (newdecl
) = DECL_UNINLINABLE (olddecl
)
2330 = (DECL_UNINLINABLE (newdecl
) || DECL_UNINLINABLE (olddecl
));
2332 DECL_DISREGARD_INLINE_LIMITS (newdecl
)
2333 = DECL_DISREGARD_INLINE_LIMITS (olddecl
)
2334 = (DECL_DISREGARD_INLINE_LIMITS (newdecl
)
2335 || DECL_DISREGARD_INLINE_LIMITS (olddecl
));
2338 if (DECL_BUILT_IN (olddecl
))
2340 /* If redeclaring a builtin function, it stays built in.
2341 But it gets tagged as having been declared. */
2342 DECL_BUILT_IN_CLASS (newdecl
) = DECL_BUILT_IN_CLASS (olddecl
);
2343 DECL_FUNCTION_CODE (newdecl
) = DECL_FUNCTION_CODE (olddecl
);
2344 C_DECL_DECLARED_BUILTIN (newdecl
) = 1;
2345 if (new_is_prototype
)
2346 C_DECL_BUILTIN_PROTOTYPE (newdecl
) = 0;
2348 C_DECL_BUILTIN_PROTOTYPE (newdecl
)
2349 = C_DECL_BUILTIN_PROTOTYPE (olddecl
);
2352 /* Preserve function specific target and optimization options */
2353 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl
)
2354 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl
))
2355 DECL_FUNCTION_SPECIFIC_TARGET (newdecl
)
2356 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl
);
2358 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl
)
2359 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl
))
2360 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl
)
2361 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl
);
2363 /* Also preserve various other info from the definition. */
2364 if (!new_is_definition
)
2367 DECL_RESULT (newdecl
) = DECL_RESULT (olddecl
);
2368 DECL_INITIAL (newdecl
) = DECL_INITIAL (olddecl
);
2369 DECL_STRUCT_FUNCTION (newdecl
) = DECL_STRUCT_FUNCTION (olddecl
);
2370 DECL_SAVED_TREE (newdecl
) = DECL_SAVED_TREE (olddecl
);
2371 gimple_set_body (newdecl
, gimple_body (olddecl
));
2372 DECL_ARGUMENTS (newdecl
) = copy_list (DECL_ARGUMENTS (olddecl
));
2373 for (t
= DECL_ARGUMENTS (newdecl
); t
; t
= TREE_CHAIN (t
))
2374 DECL_CONTEXT (t
) = newdecl
;
2376 /* See if we've got a function to instantiate from. */
2377 if (DECL_SAVED_TREE (olddecl
))
2378 DECL_ABSTRACT_ORIGIN (newdecl
)
2379 = DECL_ABSTRACT_ORIGIN (olddecl
);
2383 extern_changed
= DECL_EXTERNAL (olddecl
) && !DECL_EXTERNAL (newdecl
);
2385 /* Merge the USED information. */
2386 if (TREE_USED (olddecl
))
2387 TREE_USED (newdecl
) = 1;
2388 else if (TREE_USED (newdecl
))
2389 TREE_USED (olddecl
) = 1;
2390 if (DECL_PRESERVE_P (olddecl
))
2391 DECL_PRESERVE_P (newdecl
) = 1;
2392 else if (DECL_PRESERVE_P (newdecl
))
2393 DECL_PRESERVE_P (olddecl
) = 1;
2395 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
2396 But preserve OLDDECL's DECL_UID, DECL_CONTEXT and
2397 DECL_ARGUMENTS (if appropriate). */
2399 unsigned olddecl_uid
= DECL_UID (olddecl
);
2400 tree olddecl_context
= DECL_CONTEXT (olddecl
);
2401 tree olddecl_arguments
= NULL
;
2402 if (TREE_CODE (olddecl
) == FUNCTION_DECL
)
2403 olddecl_arguments
= DECL_ARGUMENTS (olddecl
);
2405 memcpy ((char *) olddecl
+ sizeof (struct tree_common
),
2406 (char *) newdecl
+ sizeof (struct tree_common
),
2407 sizeof (struct tree_decl_common
) - sizeof (struct tree_common
));
2408 switch (TREE_CODE (olddecl
))
2411 gimple_set_body (olddecl
, gimple_body (newdecl
));
2421 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
2422 (char *) newdecl
+ sizeof (struct tree_decl_common
),
2423 tree_code_size (TREE_CODE (olddecl
)) - sizeof (struct tree_decl_common
));
2428 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
2429 (char *) newdecl
+ sizeof (struct tree_decl_common
),
2430 sizeof (struct tree_decl_non_common
) - sizeof (struct tree_decl_common
));
2432 DECL_UID (olddecl
) = olddecl_uid
;
2433 DECL_CONTEXT (olddecl
) = olddecl_context
;
2434 if (TREE_CODE (olddecl
) == FUNCTION_DECL
)
2435 DECL_ARGUMENTS (olddecl
) = olddecl_arguments
;
2438 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2439 so that encode_section_info has a chance to look at the new decl
2440 flags and attributes. */
2441 if (DECL_RTL_SET_P (olddecl
)
2442 && (TREE_CODE (olddecl
) == FUNCTION_DECL
2443 || (TREE_CODE (olddecl
) == VAR_DECL
2444 && TREE_STATIC (olddecl
))))
2445 make_decl_rtl (olddecl
);
2447 /* If we changed a function from DECL_EXTERNAL to !DECL_EXTERNAL,
2448 and the definition is coming from the old version, cgraph needs
2449 to be called again. */
2450 if (extern_changed
&& !new_is_definition
2451 && TREE_CODE (olddecl
) == FUNCTION_DECL
&& DECL_INITIAL (olddecl
))
2452 cgraph_mark_if_needed (olddecl
);
2455 /* Handle when a new declaration NEWDECL has the same name as an old
2456 one OLDDECL in the same binding contour. Prints an error message
2459 If safely possible, alter OLDDECL to look like NEWDECL, and return
2460 true. Otherwise, return false. */
2463 duplicate_decls (tree newdecl
, tree olddecl
)
2465 tree newtype
= NULL
, oldtype
= NULL
;
2467 if (!diagnose_mismatched_decls (newdecl
, olddecl
, &newtype
, &oldtype
))
2469 /* Avoid `unused variable' and other warnings for OLDDECL. */
2470 TREE_NO_WARNING (olddecl
) = 1;
2474 merge_decls (newdecl
, olddecl
, newtype
, oldtype
);
2479 /* Check whether decl-node NEW_DECL shadows an existing declaration. */
2481 warn_if_shadowing (tree new_decl
)
2483 struct c_binding
*b
;
2485 /* Shadow warnings wanted? */
2487 /* No shadow warnings for internally generated vars. */
2488 || DECL_IS_BUILTIN (new_decl
)
2489 /* No shadow warnings for vars made for inlining. */
2490 || DECL_FROM_INLINE (new_decl
))
2493 /* Is anything being shadowed? Invisible decls do not count. */
2494 for (b
= I_SYMBOL_BINDING (DECL_NAME (new_decl
)); b
; b
= b
->shadowed
)
2495 if (b
->decl
&& b
->decl
!= new_decl
&& !b
->invisible
)
2497 tree old_decl
= b
->decl
;
2499 if (old_decl
== error_mark_node
)
2501 warning (OPT_Wshadow
, "declaration of %q+D shadows previous "
2502 "non-variable", new_decl
);
2505 else if (TREE_CODE (old_decl
) == PARM_DECL
)
2506 warning (OPT_Wshadow
, "declaration of %q+D shadows a parameter",
2508 else if (DECL_FILE_SCOPE_P (old_decl
))
2509 warning (OPT_Wshadow
, "declaration of %q+D shadows a global "
2510 "declaration", new_decl
);
2511 else if (TREE_CODE (old_decl
) == FUNCTION_DECL
2512 && DECL_BUILT_IN (old_decl
))
2514 warning (OPT_Wshadow
, "declaration of %q+D shadows "
2515 "a built-in function", new_decl
);
2519 warning (OPT_Wshadow
, "declaration of %q+D shadows a previous local",
2522 warning_at (DECL_SOURCE_LOCATION (old_decl
), OPT_Wshadow
,
2523 "shadowed declaration is here");
2529 /* Record a decl-node X as belonging to the current lexical scope.
2530 Check for errors (such as an incompatible declaration for the same
2531 name already seen in the same scope).
2533 Returns either X or an old decl for the same name.
2534 If an old decl is returned, it may have been smashed
2535 to agree with what X says. */
2540 tree name
= DECL_NAME (x
);
2541 struct c_scope
*scope
= current_scope
;
2542 struct c_binding
*b
;
2543 bool nested
= false;
2544 location_t locus
= DECL_SOURCE_LOCATION (x
);
2546 /* Must set DECL_CONTEXT for everything not at file scope or
2547 DECL_FILE_SCOPE_P won't work. Local externs don't count
2548 unless they have initializers (which generate code). */
2549 if (current_function_decl
2550 && ((TREE_CODE (x
) != FUNCTION_DECL
&& TREE_CODE (x
) != VAR_DECL
)
2551 || DECL_INITIAL (x
) || !DECL_EXTERNAL (x
)))
2552 DECL_CONTEXT (x
) = current_function_decl
;
2554 /* Anonymous decls are just inserted in the scope. */
2557 bind (name
, x
, scope
, /*invisible=*/false, /*nested=*/false,
2562 /* First, see if there is another declaration with the same name in
2563 the current scope. If there is, duplicate_decls may do all the
2564 work for us. If duplicate_decls returns false, that indicates
2565 two incompatible decls in the same scope; we are to silently
2566 replace the old one (duplicate_decls has issued all appropriate
2567 diagnostics). In particular, we should not consider possible
2568 duplicates in the external scope, or shadowing. */
2569 b
= I_SYMBOL_BINDING (name
);
2570 if (b
&& B_IN_SCOPE (b
, scope
))
2572 struct c_binding
*b_ext
, *b_use
;
2573 tree type
= TREE_TYPE (x
);
2574 tree visdecl
= b
->decl
;
2575 tree vistype
= TREE_TYPE (visdecl
);
2576 if (TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
2577 && COMPLETE_TYPE_P (TREE_TYPE (x
)))
2578 b
->inner_comp
= false;
2581 /* If this is an external linkage declaration, we should check
2582 for compatibility with the type in the external scope before
2583 setting the type at this scope based on the visible
2584 information only. */
2585 if (TREE_PUBLIC (x
) && TREE_PUBLIC (visdecl
))
2587 while (b_ext
&& !B_IN_EXTERNAL_SCOPE (b_ext
))
2588 b_ext
= b_ext
->shadowed
;
2593 TREE_TYPE (b_use
->decl
) = b_use
->u
.type
;
2596 if (duplicate_decls (x
, b_use
->decl
))
2600 /* Save the updated type in the external scope and
2601 restore the proper type for this scope. */
2603 if (comptypes (vistype
, type
))
2604 thistype
= composite_type (vistype
, type
);
2606 thistype
= TREE_TYPE (b_use
->decl
);
2607 b_use
->u
.type
= TREE_TYPE (b_use
->decl
);
2608 if (TREE_CODE (b_use
->decl
) == FUNCTION_DECL
2609 && DECL_BUILT_IN (b_use
->decl
))
2611 = build_type_attribute_variant (thistype
,
2614 TREE_TYPE (b_use
->decl
) = thistype
;
2619 goto skip_external_and_shadow_checks
;
2622 /* All declarations with external linkage, and all external
2623 references, go in the external scope, no matter what scope is
2624 current. However, the binding in that scope is ignored for
2625 purposes of normal name lookup. A separate binding structure is
2626 created in the requested scope; this governs the normal
2627 visibility of the symbol.
2629 The binding in the externals scope is used exclusively for
2630 detecting duplicate declarations of the same object, no matter
2631 what scope they are in; this is what we do here. (C99 6.2.7p2:
2632 All declarations that refer to the same object or function shall
2633 have compatible type; otherwise, the behavior is undefined.) */
2634 if (DECL_EXTERNAL (x
) || scope
== file_scope
)
2636 tree type
= TREE_TYPE (x
);
2639 bool type_saved
= false;
2640 if (b
&& !B_IN_EXTERNAL_SCOPE (b
)
2641 && (TREE_CODE (b
->decl
) == FUNCTION_DECL
2642 || TREE_CODE (b
->decl
) == VAR_DECL
)
2643 && DECL_FILE_SCOPE_P (b
->decl
))
2646 vistype
= TREE_TYPE (visdecl
);
2648 if (scope
!= file_scope
2649 && !DECL_IN_SYSTEM_HEADER (x
))
2650 warning (OPT_Wnested_externs
, "nested extern declaration of %qD", x
);
2652 while (b
&& !B_IN_EXTERNAL_SCOPE (b
))
2654 /* If this decl might be modified, save its type. This is
2655 done here rather than when the decl is first bound
2656 because the type may change after first binding, through
2657 being completed or through attributes being added. If we
2658 encounter multiple such decls, only the first should have
2659 its type saved; the others will already have had their
2660 proper types saved and the types will not have changed as
2661 their scopes will not have been re-entered. */
2662 if (DECL_P (b
->decl
) && DECL_FILE_SCOPE_P (b
->decl
) && !type_saved
)
2664 b
->u
.type
= TREE_TYPE (b
->decl
);
2667 if (B_IN_FILE_SCOPE (b
)
2668 && TREE_CODE (b
->decl
) == VAR_DECL
2669 && TREE_STATIC (b
->decl
)
2670 && TREE_CODE (TREE_TYPE (b
->decl
)) == ARRAY_TYPE
2671 && !TYPE_DOMAIN (TREE_TYPE (b
->decl
))
2672 && TREE_CODE (type
) == ARRAY_TYPE
2673 && TYPE_DOMAIN (type
)
2674 && TYPE_MAX_VALUE (TYPE_DOMAIN (type
))
2675 && !integer_zerop (TYPE_MAX_VALUE (TYPE_DOMAIN (type
))))
2677 /* Array type completed in inner scope, which should be
2678 diagnosed if the completion does not have size 1 and
2679 it does not get completed in the file scope. */
2680 b
->inner_comp
= true;
2685 /* If a matching external declaration has been found, set its
2686 type to the composite of all the types of that declaration.
2687 After the consistency checks, it will be reset to the
2688 composite of the visible types only. */
2689 if (b
&& (TREE_PUBLIC (x
) || same_translation_unit_p (x
, b
->decl
))
2691 TREE_TYPE (b
->decl
) = b
->u
.type
;
2693 /* The point of the same_translation_unit_p check here is,
2694 we want to detect a duplicate decl for a construct like
2695 foo() { extern bar(); } ... static bar(); but not if
2696 they are in different translation units. In any case,
2697 the static does not go in the externals scope. */
2699 && (TREE_PUBLIC (x
) || same_translation_unit_p (x
, b
->decl
))
2700 && duplicate_decls (x
, b
->decl
))
2705 if (comptypes (vistype
, type
))
2706 thistype
= composite_type (vistype
, type
);
2708 thistype
= TREE_TYPE (b
->decl
);
2712 b
->u
.type
= TREE_TYPE (b
->decl
);
2713 if (TREE_CODE (b
->decl
) == FUNCTION_DECL
&& DECL_BUILT_IN (b
->decl
))
2715 = build_type_attribute_variant (thistype
,
2716 TYPE_ATTRIBUTES (b
->u
.type
));
2717 TREE_TYPE (b
->decl
) = thistype
;
2718 bind (name
, b
->decl
, scope
, /*invisible=*/false, /*nested=*/true,
2722 else if (TREE_PUBLIC (x
))
2724 if (visdecl
&& !b
&& duplicate_decls (x
, visdecl
))
2726 /* An external declaration at block scope referring to a
2727 visible entity with internal linkage. The composite
2728 type will already be correct for this scope, so we
2729 just need to fall through to make the declaration in
2736 bind (name
, x
, external_scope
, /*invisible=*/true,
2737 /*nested=*/false, locus
);
2743 if (TREE_CODE (x
) != PARM_DECL
)
2744 warn_if_shadowing (x
);
2746 skip_external_and_shadow_checks
:
2747 if (TREE_CODE (x
) == TYPE_DECL
)
2748 set_underlying_type (x
);
2750 bind (name
, x
, scope
, /*invisible=*/false, nested
, locus
);
2752 /* If x's type is incomplete because it's based on a
2753 structure or union which has not yet been fully declared,
2754 attach it to that structure or union type, so we can go
2755 back and complete the variable declaration later, if the
2756 structure or union gets fully declared.
2758 If the input is erroneous, we can have error_mark in the type
2759 slot (e.g. "f(void a, ...)") - that doesn't count as an
2761 if (TREE_TYPE (x
) != error_mark_node
2762 && !COMPLETE_TYPE_P (TREE_TYPE (x
)))
2764 tree element
= TREE_TYPE (x
);
2766 while (TREE_CODE (element
) == ARRAY_TYPE
)
2767 element
= TREE_TYPE (element
);
2768 element
= TYPE_MAIN_VARIANT (element
);
2770 if ((TREE_CODE (element
) == RECORD_TYPE
2771 || TREE_CODE (element
) == UNION_TYPE
)
2772 && (TREE_CODE (x
) != TYPE_DECL
2773 || TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
)
2774 && !COMPLETE_TYPE_P (element
))
2775 C_TYPE_INCOMPLETE_VARS (element
)
2776 = tree_cons (NULL_TREE
, x
, C_TYPE_INCOMPLETE_VARS (element
));
2781 /* Record X as belonging to file scope.
2782 This is used only internally by the Objective-C front end,
2783 and is limited to its needs. duplicate_decls is not called;
2784 if there is any preexisting decl for this identifier, it is an ICE. */
2787 pushdecl_top_level (tree x
)
2790 bool nested
= false;
2791 gcc_assert (TREE_CODE (x
) == VAR_DECL
|| TREE_CODE (x
) == CONST_DECL
);
2793 name
= DECL_NAME (x
);
2795 gcc_assert (TREE_CODE (x
) == CONST_DECL
|| !I_SYMBOL_BINDING (name
));
2797 if (TREE_PUBLIC (x
))
2799 bind (name
, x
, external_scope
, /*invisible=*/true, /*nested=*/false,
2804 bind (name
, x
, file_scope
, /*invisible=*/false, nested
, UNKNOWN_LOCATION
);
2810 implicit_decl_warning (tree id
, tree olddecl
)
2812 if (warn_implicit_function_declaration
)
2817 warned
= pedwarn (input_location
, OPT_Wimplicit_function_declaration
,
2818 "implicit declaration of function %qE", id
);
2820 warned
= warning (OPT_Wimplicit_function_declaration
,
2821 G_("implicit declaration of function %qE"), id
);
2822 if (olddecl
&& warned
)
2823 locate_old_decl (olddecl
);
2827 /* Generate an implicit declaration for identifier FUNCTIONID at LOC as a
2828 function of type int (). */
2831 implicitly_declare (location_t loc
, tree functionid
)
2833 struct c_binding
*b
;
2837 for (b
= I_SYMBOL_BINDING (functionid
); b
; b
= b
->shadowed
)
2839 if (B_IN_SCOPE (b
, external_scope
))
2848 if (decl
== error_mark_node
)
2851 /* FIXME: Objective-C has weird not-really-builtin functions
2852 which are supposed to be visible automatically. They wind up
2853 in the external scope because they're pushed before the file
2854 scope gets created. Catch this here and rebind them into the
2856 if (!DECL_BUILT_IN (decl
) && DECL_IS_BUILTIN (decl
))
2858 bind (functionid
, decl
, file_scope
,
2859 /*invisible=*/false, /*nested=*/true,
2860 DECL_SOURCE_LOCATION (decl
));
2865 tree newtype
= default_function_type
;
2867 TREE_TYPE (decl
) = b
->u
.type
;
2868 /* Implicit declaration of a function already declared
2869 (somehow) in a different scope, or as a built-in.
2870 If this is the first time this has happened, warn;
2871 then recycle the old declaration but with the new type. */
2872 if (!C_DECL_IMPLICIT (decl
))
2874 implicit_decl_warning (functionid
, decl
);
2875 C_DECL_IMPLICIT (decl
) = 1;
2877 if (DECL_BUILT_IN (decl
))
2879 newtype
= build_type_attribute_variant (newtype
,
2881 (TREE_TYPE (decl
)));
2882 if (!comptypes (newtype
, TREE_TYPE (decl
)))
2884 warning_at (loc
, 0, "incompatible implicit declaration of "
2885 "built-in function %qD", decl
);
2886 newtype
= TREE_TYPE (decl
);
2891 if (!comptypes (newtype
, TREE_TYPE (decl
)))
2893 error_at (loc
, "incompatible implicit declaration of function %qD", decl
);
2894 locate_old_decl (decl
);
2897 b
->u
.type
= TREE_TYPE (decl
);
2898 TREE_TYPE (decl
) = newtype
;
2899 bind (functionid
, decl
, current_scope
,
2900 /*invisible=*/false, /*nested=*/true,
2901 DECL_SOURCE_LOCATION (decl
));
2906 /* Not seen before. */
2907 decl
= build_decl (loc
, FUNCTION_DECL
, functionid
, default_function_type
);
2908 DECL_EXTERNAL (decl
) = 1;
2909 TREE_PUBLIC (decl
) = 1;
2910 C_DECL_IMPLICIT (decl
) = 1;
2911 implicit_decl_warning (functionid
, 0);
2912 asmspec_tree
= maybe_apply_renaming_pragma (decl
, /*asmname=*/NULL
);
2914 set_user_assembler_name (decl
, TREE_STRING_POINTER (asmspec_tree
));
2916 /* C89 says implicit declarations are in the innermost block.
2917 So we record the decl in the standard fashion. */
2918 decl
= pushdecl (decl
);
2920 /* No need to call objc_check_decl here - it's a function type. */
2921 rest_of_decl_compilation (decl
, 0, 0);
2923 /* Write a record describing this implicit function declaration
2924 to the prototypes file (if requested). */
2925 gen_aux_info_record (decl
, 0, 1, 0);
2927 /* Possibly apply some default attributes to this implicit declaration. */
2928 decl_attributes (&decl
, NULL_TREE
, 0);
2933 /* Issue an error message for a reference to an undeclared variable
2934 ID, including a reference to a builtin outside of function-call
2935 context. Establish a binding of the identifier to error_mark_node
2936 in an appropriate scope, which will suppress further errors for the
2937 same identifier. The error message should be given location LOC. */
2939 undeclared_variable (location_t loc
, tree id
)
2941 static bool already
= false;
2942 struct c_scope
*scope
;
2944 if (current_function_decl
== 0)
2946 error_at (loc
, "%qE undeclared here (not in a function)", id
);
2947 scope
= current_scope
;
2951 error_at (loc
, "%qE undeclared (first use in this function)", id
);
2954 inform (loc
, "each undeclared identifier is reported only"
2955 " once for each function it appears in");
2959 /* If we are parsing old-style parameter decls, current_function_decl
2960 will be nonnull but current_function_scope will be null. */
2961 scope
= current_function_scope
? current_function_scope
: current_scope
;
2963 bind (id
, error_mark_node
, scope
, /*invisible=*/false, /*nested=*/false,
2967 /* Subroutine of lookup_label, declare_label, define_label: construct a
2968 LABEL_DECL with all the proper frills. Also create a struct
2969 c_label_vars initialized for the current scope. */
2972 make_label (location_t location
, tree name
, bool defining
,
2973 struct c_label_vars
**p_label_vars
)
2975 tree label
= build_decl (location
, LABEL_DECL
, name
, void_type_node
);
2976 struct c_label_vars
*label_vars
;
2978 DECL_CONTEXT (label
) = current_function_decl
;
2979 DECL_MODE (label
) = VOIDmode
;
2981 label_vars
= GGC_NEW (struct c_label_vars
);
2982 label_vars
->shadowed
= NULL
;
2983 set_spot_bindings (&label_vars
->label_bindings
, defining
);
2984 label_vars
->decls_in_scope
= make_tree_vector ();
2985 label_vars
->gotos
= VEC_alloc (c_goto_bindings_p
, gc
, 0);
2986 *p_label_vars
= label_vars
;
2991 /* Get the LABEL_DECL corresponding to identifier NAME as a label.
2992 Create one if none exists so far for the current function.
2993 This is called when a label is used in a goto expression or
2994 has its address taken. */
2997 lookup_label (tree name
)
3000 struct c_label_vars
*label_vars
;
3002 if (current_function_decl
== 0)
3004 error ("label %qE referenced outside of any function", name
);
3008 /* Use a label already defined or ref'd with this name, but not if
3009 it is inherited from a containing function and wasn't declared
3011 label
= I_LABEL_DECL (name
);
3012 if (label
&& (DECL_CONTEXT (label
) == current_function_decl
3013 || C_DECLARED_LABEL_FLAG (label
)))
3015 /* If the label has only been declared, update its apparent
3016 location to point here, for better diagnostics if it
3017 turns out not to have been defined. */
3018 if (DECL_INITIAL (label
) == NULL_TREE
)
3019 DECL_SOURCE_LOCATION (label
) = input_location
;
3023 /* No label binding for that identifier; make one. */
3024 label
= make_label (input_location
, name
, false, &label_vars
);
3026 /* Ordinary labels go in the current function scope. */
3027 bind_label (name
, label
, current_function_scope
, label_vars
);
3032 /* Issue a warning about DECL for a goto statement at GOTO_LOC going
3036 warn_about_goto (location_t goto_loc
, tree label
, tree decl
)
3038 if (variably_modified_type_p (TREE_TYPE (decl
), NULL_TREE
))
3040 "jump into scope of identifier with variably modified type");
3042 warning_at (goto_loc
, OPT_Wjump_misses_init
,
3043 "jump skips variable initialization");
3044 inform (DECL_SOURCE_LOCATION (label
), "label %qD defined here", label
);
3045 inform (DECL_SOURCE_LOCATION (decl
), "%qD declared here", decl
);
3048 /* Look up a label because of a goto statement. This is like
3049 lookup_label, but also issues any appropriate warnings. */
3052 lookup_label_for_goto (location_t loc
, tree name
)
3055 struct c_label_vars
*label_vars
;
3059 label
= lookup_label (name
);
3060 if (label
== NULL_TREE
)
3063 /* If we are jumping to a different function, we can't issue any
3065 if (DECL_CONTEXT (label
) != current_function_decl
)
3067 gcc_assert (C_DECLARED_LABEL_FLAG (label
));
3071 label_vars
= I_LABEL_BINDING (name
)->u
.label
;
3073 /* If the label has not yet been defined, then push this goto on a
3074 list for possible later warnings. */
3075 if (label_vars
->label_bindings
.scope
== NULL
)
3077 struct c_goto_bindings
*g
;
3079 g
= GGC_NEW (struct c_goto_bindings
);
3081 set_spot_bindings (&g
->goto_bindings
, true);
3082 VEC_safe_push (c_goto_bindings_p
, gc
, label_vars
->gotos
, g
);
3086 /* If there are any decls in label_vars->decls_in_scope, then this
3087 goto has missed the declaration of the decl. This happens for a
3093 Issue a warning or error. */
3094 for (ix
= 0; VEC_iterate (tree
, label_vars
->decls_in_scope
, ix
, decl
); ++ix
)
3095 warn_about_goto (loc
, label
, decl
);
3097 if (label_vars
->label_bindings
.left_stmt_expr
)
3099 error_at (loc
, "jump into statement expression");
3100 inform (DECL_SOURCE_LOCATION (label
), "label %qD defined here", label
);
3106 /* Make a label named NAME in the current function, shadowing silently
3107 any that may be inherited from containing functions or containing
3108 scopes. This is called for __label__ declarations. */
3111 declare_label (tree name
)
3113 struct c_binding
*b
= I_LABEL_BINDING (name
);
3115 struct c_label_vars
*label_vars
;
3117 /* Check to make sure that the label hasn't already been declared
3119 if (b
&& B_IN_CURRENT_SCOPE (b
))
3121 error ("duplicate label declaration %qE", name
);
3122 locate_old_decl (b
->decl
);
3124 /* Just use the previous declaration. */
3128 label
= make_label (input_location
, name
, false, &label_vars
);
3129 C_DECLARED_LABEL_FLAG (label
) = 1;
3131 /* Declared labels go in the current scope. */
3132 bind_label (name
, label
, current_scope
, label_vars
);
3137 /* When we define a label, issue any appropriate warnings if there are
3138 any gotos earlier in the function which jump to this label. */
3141 check_earlier_gotos (tree label
, struct c_label_vars
* label_vars
)
3144 struct c_goto_bindings
*g
;
3147 VEC_iterate (c_goto_bindings_p
, label_vars
->gotos
, ix
, g
);
3150 struct c_binding
*b
;
3151 struct c_scope
*scope
;
3153 /* We have a goto to this label. The goto is going forward. In
3154 g->scope, the goto is going to skip any binding which was
3155 defined after g->bindings_in_scope. */
3156 for (b
= g
->goto_bindings
.scope
->bindings
;
3157 b
!= g
->goto_bindings
.bindings_in_scope
;
3160 if (decl_jump_unsafe (b
->decl
))
3161 warn_about_goto (g
->loc
, label
, b
->decl
);
3164 /* We also need to warn about decls defined in any scopes
3165 between the scope of the label and the scope of the goto. */
3166 for (scope
= label_vars
->label_bindings
.scope
;
3167 scope
!= g
->goto_bindings
.scope
;
3168 scope
= scope
->outer
)
3170 gcc_assert (scope
!= NULL
);
3171 if (scope
== label_vars
->label_bindings
.scope
)
3172 b
= label_vars
->label_bindings
.bindings_in_scope
;
3174 b
= scope
->bindings
;
3175 for (; b
!= NULL
; b
= b
->prev
)
3177 if (decl_jump_unsafe (b
->decl
))
3178 warn_about_goto (g
->loc
, label
, b
->decl
);
3182 if (g
->goto_bindings
.stmt_exprs
> 0)
3184 error_at (g
->loc
, "jump into statement expression");
3185 inform (DECL_SOURCE_LOCATION (label
), "label %qD defined here",
3190 /* Now that the label is defined, we will issue warnings about
3191 subsequent gotos to this label when we see them. */
3192 VEC_truncate (c_goto_bindings_p
, label_vars
->gotos
, 0);
3193 label_vars
->gotos
= NULL
;
3196 /* Define a label, specifying the location in the source file.
3197 Return the LABEL_DECL node for the label, if the definition is valid.
3198 Otherwise return 0. */
3201 define_label (location_t location
, tree name
)
3203 /* Find any preexisting label with this name. It is an error
3204 if that label has already been defined in this function, or
3205 if there is a containing function with a declared label with
3207 tree label
= I_LABEL_DECL (name
);
3210 && ((DECL_CONTEXT (label
) == current_function_decl
3211 && DECL_INITIAL (label
) != 0)
3212 || (DECL_CONTEXT (label
) != current_function_decl
3213 && C_DECLARED_LABEL_FLAG (label
))))
3215 error_at (location
, "duplicate label %qD", label
);
3216 locate_old_decl (label
);
3219 else if (label
&& DECL_CONTEXT (label
) == current_function_decl
)
3221 struct c_label_vars
*label_vars
= I_LABEL_BINDING (name
)->u
.label
;
3223 /* The label has been used or declared already in this function,
3224 but not defined. Update its location to point to this
3226 DECL_SOURCE_LOCATION (label
) = location
;
3227 set_spot_bindings (&label_vars
->label_bindings
, true);
3229 /* Issue warnings as required about any goto statements from
3230 earlier in the function. */
3231 check_earlier_gotos (label
, label_vars
);
3235 struct c_label_vars
*label_vars
;
3237 /* No label binding for that identifier; make one. */
3238 label
= make_label (location
, name
, true, &label_vars
);
3240 /* Ordinary labels go in the current function scope. */
3241 bind_label (name
, label
, current_function_scope
, label_vars
);
3244 if (!in_system_header
&& lookup_name (name
))
3245 warning_at (location
, OPT_Wtraditional
,
3246 "traditional C lacks a separate namespace "
3247 "for labels, identifier %qE conflicts", name
);
3249 /* Mark label as having been defined. */
3250 DECL_INITIAL (label
) = error_mark_node
;
3254 /* Get the bindings for a new switch statement. This is used to issue
3255 warnings as appropriate for jumps from the switch to case or
3258 struct c_spot_bindings
*
3259 c_get_switch_bindings (void)
3261 struct c_spot_bindings
*switch_bindings
;
3263 switch_bindings
= XNEW (struct c_spot_bindings
);
3264 set_spot_bindings (switch_bindings
, true);
3265 return switch_bindings
;
3269 c_release_switch_bindings (struct c_spot_bindings
*bindings
)
3271 gcc_assert (bindings
->stmt_exprs
== 0 && !bindings
->left_stmt_expr
);
3275 /* This is called at the point of a case or default label to issue
3276 warnings about decls as needed. It returns true if it found an
3277 error, not just a warning. */
3280 c_check_switch_jump_warnings (struct c_spot_bindings
*switch_bindings
,
3281 location_t switch_loc
, location_t case_loc
)
3284 struct c_scope
*scope
;
3287 for (scope
= current_scope
;
3288 scope
!= switch_bindings
->scope
;
3289 scope
= scope
->outer
)
3291 struct c_binding
*b
;
3293 gcc_assert (scope
!= NULL
);
3294 for (b
= scope
->bindings
; b
!= NULL
; b
= b
->prev
)
3296 if (decl_jump_unsafe (b
->decl
))
3298 if (variably_modified_type_p (TREE_TYPE (b
->decl
), NULL_TREE
))
3302 ("switch jumps into scope of identifier with "
3303 "variably modified type"));
3306 warning_at (case_loc
, OPT_Wjump_misses_init
,
3307 "switch jumps over variable initialization");
3308 inform (switch_loc
, "switch starts here");
3309 inform (DECL_SOURCE_LOCATION (b
->decl
), "%qD declared here",
3315 if (switch_bindings
->stmt_exprs
> 0)
3318 error_at (case_loc
, "switch jumps into statement expression");
3319 inform (switch_loc
, "switch starts here");
3325 /* Given NAME, an IDENTIFIER_NODE,
3326 return the structure (or union or enum) definition for that name.
3327 If THISLEVEL_ONLY is nonzero, searches only the current_scope.
3328 CODE says which kind of type the caller wants;
3329 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
3330 If PLOC is not NULL and this returns non-null, it sets *PLOC to the
3331 location where the tag was defined.
3332 If the wrong kind of type is found, an error is reported. */
3335 lookup_tag (enum tree_code code
, tree name
, int thislevel_only
,
3338 struct c_binding
*b
= I_TAG_BINDING (name
);
3344 /* We only care about whether it's in this level if
3345 thislevel_only was set or it might be a type clash. */
3346 if (thislevel_only
|| TREE_CODE (b
->decl
) != code
)
3348 /* For our purposes, a tag in the external scope is the same as
3349 a tag in the file scope. (Primarily relevant to Objective-C
3350 and its builtin structure tags, which get pushed before the
3351 file scope is created.) */
3352 if (B_IN_CURRENT_SCOPE (b
)
3353 || (current_scope
== file_scope
&& B_IN_EXTERNAL_SCOPE (b
)))
3357 if (thislevel_only
&& !thislevel
)
3360 if (TREE_CODE (b
->decl
) != code
)
3362 /* Definition isn't the kind we were looking for. */
3363 pending_invalid_xref
= name
;
3364 pending_invalid_xref_location
= input_location
;
3366 /* If in the same binding level as a declaration as a tag
3367 of a different type, this must not be allowed to
3368 shadow that tag, so give the error immediately.
3369 (For example, "struct foo; union foo;" is invalid.) */
3371 pending_xref_error ();
3380 /* Print an error message now
3381 for a recent invalid struct, union or enum cross reference.
3382 We don't print them immediately because they are not invalid
3383 when used in the `struct foo;' construct for shadowing. */
3386 pending_xref_error (void)
3388 if (pending_invalid_xref
!= 0)
3389 error_at (pending_invalid_xref_location
, "%qE defined as wrong kind of tag",
3390 pending_invalid_xref
);
3391 pending_invalid_xref
= 0;
3395 /* Look up NAME in the current scope and its superiors
3396 in the namespace of variables, functions and typedefs.
3397 Return a ..._DECL node of some kind representing its definition,
3398 or return 0 if it is undefined. */
3401 lookup_name (tree name
)
3403 struct c_binding
*b
= I_SYMBOL_BINDING (name
);
3404 if (b
&& !b
->invisible
)
3409 /* Similar to `lookup_name' but look only at the indicated scope. */
3412 lookup_name_in_scope (tree name
, struct c_scope
*scope
)
3414 struct c_binding
*b
;
3416 for (b
= I_SYMBOL_BINDING (name
); b
; b
= b
->shadowed
)
3417 if (B_IN_SCOPE (b
, scope
))
3422 /* Create the predefined scalar types of C,
3423 and some nodes representing standard constants (0, 1, (void *) 0).
3424 Initialize the global scope.
3425 Make definitions for built-in primitive functions. */
3428 c_init_decl_processing (void)
3430 location_t save_loc
= input_location
;
3432 /* Initialize reserved words for parser. */
3435 current_function_decl
= 0;
3437 gcc_obstack_init (&parser_obstack
);
3439 /* Make the externals scope. */
3441 external_scope
= current_scope
;
3443 /* Declarations from c_common_nodes_and_builtins must not be associated
3444 with this input file, lest we get differences between using and not
3445 using preprocessed headers. */
3446 input_location
= BUILTINS_LOCATION
;
3448 build_common_tree_nodes (flag_signed_char
, false);
3450 c_common_nodes_and_builtins ();
3452 /* In C, comparisons and TRUTH_* expressions have type int. */
3453 truthvalue_type_node
= integer_type_node
;
3454 truthvalue_true_node
= integer_one_node
;
3455 truthvalue_false_node
= integer_zero_node
;
3457 /* Even in C99, which has a real boolean type. */
3458 pushdecl (build_decl (UNKNOWN_LOCATION
, TYPE_DECL
, get_identifier ("_Bool"),
3459 boolean_type_node
));
3461 input_location
= save_loc
;
3463 pedantic_lvalues
= true;
3465 make_fname_decl
= c_make_fname_decl
;
3466 start_fname_decls ();
3469 /* Create the VAR_DECL at LOC for __FUNCTION__ etc. ID is the name to
3470 give the decl, NAME is the initialization string and TYPE_DEP
3471 indicates whether NAME depended on the type of the function. As we
3472 don't yet implement delayed emission of static data, we mark the
3473 decl as emitted so it is not placed in the output. Anything using
3474 it must therefore pull out the STRING_CST initializer directly.
3478 c_make_fname_decl (location_t loc
, tree id
, int type_dep
)
3480 const char *name
= fname_as_string (type_dep
);
3481 tree decl
, type
, init
;
3482 size_t length
= strlen (name
);
3484 type
= build_array_type (char_type_node
,
3485 build_index_type (size_int (length
)));
3486 type
= c_build_qualified_type (type
, TYPE_QUAL_CONST
);
3488 decl
= build_decl (loc
, VAR_DECL
, id
, type
);
3490 TREE_STATIC (decl
) = 1;
3491 TREE_READONLY (decl
) = 1;
3492 DECL_ARTIFICIAL (decl
) = 1;
3494 init
= build_string (length
+ 1, name
);
3495 free (CONST_CAST (char *, name
));
3496 TREE_TYPE (init
) = type
;
3497 DECL_INITIAL (decl
) = init
;
3499 TREE_USED (decl
) = 1;
3501 if (current_function_decl
3502 /* For invalid programs like this:
3505 const char* p = __FUNCTION__;
3507 the __FUNCTION__ is believed to appear in K&R style function
3508 parameter declarator. In that case we still don't have
3510 && (!errorcount
|| current_function_scope
))
3512 DECL_CONTEXT (decl
) = current_function_decl
;
3513 bind (id
, decl
, current_function_scope
,
3514 /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION
);
3517 finish_decl (decl
, loc
, init
, NULL_TREE
, NULL_TREE
);
3523 c_builtin_function (tree decl
)
3525 tree type
= TREE_TYPE (decl
);
3526 tree id
= DECL_NAME (decl
);
3528 const char *name
= IDENTIFIER_POINTER (id
);
3529 C_DECL_BUILTIN_PROTOTYPE (decl
) = (TYPE_ARG_TYPES (type
) != 0);
3531 /* Should never be called on a symbol with a preexisting meaning. */
3532 gcc_assert (!I_SYMBOL_BINDING (id
));
3534 bind (id
, decl
, external_scope
, /*invisible=*/true, /*nested=*/false,
3537 /* Builtins in the implementation namespace are made visible without
3538 needing to be explicitly declared. See push_file_scope. */
3539 if (name
[0] == '_' && (name
[1] == '_' || ISUPPER (name
[1])))
3541 TREE_CHAIN (decl
) = visible_builtins
;
3542 visible_builtins
= decl
;
3549 c_builtin_function_ext_scope (tree decl
)
3551 tree type
= TREE_TYPE (decl
);
3552 tree id
= DECL_NAME (decl
);
3554 const char *name
= IDENTIFIER_POINTER (id
);
3555 C_DECL_BUILTIN_PROTOTYPE (decl
) = (TYPE_ARG_TYPES (type
) != 0);
3557 /* Should never be called on a symbol with a preexisting meaning. */
3558 gcc_assert (!I_SYMBOL_BINDING (id
));
3560 bind (id
, decl
, external_scope
, /*invisible=*/false, /*nested=*/false,
3563 /* Builtins in the implementation namespace are made visible without
3564 needing to be explicitly declared. See push_file_scope. */
3565 if (name
[0] == '_' && (name
[1] == '_' || ISUPPER (name
[1])))
3567 TREE_CHAIN (decl
) = visible_builtins
;
3568 visible_builtins
= decl
;
3574 /* Called when a declaration is seen that contains no names to declare.
3575 If its type is a reference to a structure, union or enum inherited
3576 from a containing scope, shadow that tag name for the current scope
3577 with a forward reference.
3578 If its type defines a new named structure or union
3579 or defines an enum, it is valid but we need not do anything here.
3580 Otherwise, it is an error. */
3583 shadow_tag (const struct c_declspecs
*declspecs
)
3585 shadow_tag_warned (declspecs
, 0);
3588 /* WARNED is 1 if we have done a pedwarn, 2 if we have done a warning,
3591 shadow_tag_warned (const struct c_declspecs
*declspecs
, int warned
)
3593 bool found_tag
= false;
3595 if (declspecs
->type
&& !declspecs
->default_int_p
&& !declspecs
->typedef_p
)
3597 tree value
= declspecs
->type
;
3598 enum tree_code code
= TREE_CODE (value
);
3600 if (code
== RECORD_TYPE
|| code
== UNION_TYPE
|| code
== ENUMERAL_TYPE
)
3601 /* Used to test also that TYPE_SIZE (value) != 0.
3602 That caused warning for `struct foo;' at top level in the file. */
3604 tree name
= TYPE_NAME (value
);
3609 if (declspecs
->restrict_p
)
3611 error ("invalid use of %<restrict%>");
3617 if (warned
!= 1 && code
!= ENUMERAL_TYPE
)
3618 /* Empty unnamed enum OK */
3620 pedwarn (input_location
, 0,
3621 "unnamed struct/union that defines no instances");
3625 else if (!declspecs
->tag_defined_p
3626 && declspecs
->storage_class
!= csc_none
)
3629 pedwarn (input_location
, 0,
3630 "empty declaration with storage class specifier "
3631 "does not redeclare tag");
3633 pending_xref_error ();
3635 else if (!declspecs
->tag_defined_p
3636 && (declspecs
->const_p
3637 || declspecs
->volatile_p
3638 || declspecs
->restrict_p
3639 || declspecs
->address_space
))
3642 pedwarn (input_location
, 0,
3643 "empty declaration with type qualifier "
3644 "does not redeclare tag");
3646 pending_xref_error ();
3650 pending_invalid_xref
= 0;
3651 t
= lookup_tag (code
, name
, 1, NULL
);
3655 t
= make_node (code
);
3656 pushtag (input_location
, name
, t
);
3662 if (warned
!= 1 && !in_system_header
)
3664 pedwarn (input_location
, 0,
3665 "useless type name in empty declaration");
3670 else if (warned
!= 1 && !in_system_header
&& declspecs
->typedef_p
)
3672 pedwarn (input_location
, 0, "useless type name in empty declaration");
3676 pending_invalid_xref
= 0;
3678 if (declspecs
->inline_p
)
3680 error ("%<inline%> in empty declaration");
3684 if (current_scope
== file_scope
&& declspecs
->storage_class
== csc_auto
)
3686 error ("%<auto%> in file-scope empty declaration");
3690 if (current_scope
== file_scope
&& declspecs
->storage_class
== csc_register
)
3692 error ("%<register%> in file-scope empty declaration");
3696 if (!warned
&& !in_system_header
&& declspecs
->storage_class
!= csc_none
)
3698 warning (0, "useless storage class specifier in empty declaration");
3702 if (!warned
&& !in_system_header
&& declspecs
->thread_p
)
3704 warning (0, "useless %<__thread%> in empty declaration");
3708 if (!warned
&& !in_system_header
&& (declspecs
->const_p
3709 || declspecs
->volatile_p
3710 || declspecs
->restrict_p
3711 || declspecs
->address_space
))
3713 warning (0, "useless type qualifier in empty declaration");
3720 pedwarn (input_location
, 0, "empty declaration");
3725 /* Return the qualifiers from SPECS as a bitwise OR of TYPE_QUAL_*
3726 bits. SPECS represents declaration specifiers that the grammar
3727 only permits to contain type qualifiers and attributes. */
3730 quals_from_declspecs (const struct c_declspecs
*specs
)
3732 int quals
= ((specs
->const_p
? TYPE_QUAL_CONST
: 0)
3733 | (specs
->volatile_p
? TYPE_QUAL_VOLATILE
: 0)
3734 | (specs
->restrict_p
? TYPE_QUAL_RESTRICT
: 0)
3735 | (ENCODE_QUAL_ADDR_SPACE (specs
->address_space
)));
3736 gcc_assert (!specs
->type
3737 && !specs
->decl_attr
3738 && specs
->typespec_word
== cts_none
3739 && specs
->storage_class
== csc_none
3740 && !specs
->typedef_p
3741 && !specs
->explicit_signed_p
3742 && !specs
->deprecated_p
3744 && !specs
->long_long_p
3747 && !specs
->unsigned_p
3748 && !specs
->complex_p
3750 && !specs
->thread_p
);
3754 /* Construct an array declarator. LOC is the location of the
3755 beginning of the array (usually the opening brace). EXPR is the
3756 expression inside [], or NULL_TREE. QUALS are the type qualifiers
3757 inside the [] (to be applied to the pointer to which a parameter
3758 array is converted). STATIC_P is true if "static" is inside the
3759 [], false otherwise. VLA_UNSPEC_P is true if the array is [*], a
3760 VLA of unspecified length which is nevertheless a complete type,
3761 false otherwise. The field for the contained declarator is left to
3762 be filled in by set_array_declarator_inner. */
3764 struct c_declarator
*
3765 build_array_declarator (location_t loc
,
3766 tree expr
, struct c_declspecs
*quals
, bool static_p
,
3769 struct c_declarator
*declarator
= XOBNEW (&parser_obstack
,
3770 struct c_declarator
);
3771 declarator
->id_loc
= loc
;
3772 declarator
->kind
= cdk_array
;
3773 declarator
->declarator
= 0;
3774 declarator
->u
.array
.dimen
= expr
;
3777 declarator
->u
.array
.attrs
= quals
->attrs
;
3778 declarator
->u
.array
.quals
= quals_from_declspecs (quals
);
3782 declarator
->u
.array
.attrs
= NULL_TREE
;
3783 declarator
->u
.array
.quals
= 0;
3785 declarator
->u
.array
.static_p
= static_p
;
3786 declarator
->u
.array
.vla_unspec_p
= vla_unspec_p
;
3789 if (static_p
|| quals
!= NULL
)
3790 pedwarn (loc
, OPT_pedantic
,
3791 "ISO C90 does not support %<static%> or type "
3792 "qualifiers in parameter array declarators");
3794 pedwarn (loc
, OPT_pedantic
,
3795 "ISO C90 does not support %<[*]%> array declarators");
3799 if (!current_scope
->parm_flag
)
3802 error_at (loc
, "%<[*]%> not allowed in other than "
3803 "function prototype scope");
3804 declarator
->u
.array
.vla_unspec_p
= false;
3807 current_scope
->had_vla_unspec
= true;
3812 /* Set the contained declarator of an array declarator. DECL is the
3813 declarator, as constructed by build_array_declarator; INNER is what
3814 appears on the left of the []. */
3816 struct c_declarator
*
3817 set_array_declarator_inner (struct c_declarator
*decl
,
3818 struct c_declarator
*inner
)
3820 decl
->declarator
= inner
;
3824 /* INIT is a constructor that forms DECL's initializer. If the final
3825 element initializes a flexible array field, add the size of that
3826 initializer to DECL's size. */
3829 add_flexible_array_elts_to_size (tree decl
, tree init
)
3833 if (VEC_empty (constructor_elt
, CONSTRUCTOR_ELTS (init
)))
3836 elt
= VEC_last (constructor_elt
, CONSTRUCTOR_ELTS (init
))->value
;
3837 type
= TREE_TYPE (elt
);
3838 if (TREE_CODE (type
) == ARRAY_TYPE
3839 && TYPE_SIZE (type
) == NULL_TREE
3840 && TYPE_DOMAIN (type
) != NULL_TREE
3841 && TYPE_MAX_VALUE (TYPE_DOMAIN (type
)) == NULL_TREE
)
3843 complete_array_type (&type
, elt
, false);
3845 = size_binop (PLUS_EXPR
, DECL_SIZE (decl
), TYPE_SIZE (type
));
3846 DECL_SIZE_UNIT (decl
)
3847 = size_binop (PLUS_EXPR
, DECL_SIZE_UNIT (decl
), TYPE_SIZE_UNIT (type
));
3851 /* Decode a "typename", such as "int **", returning a ..._TYPE node.
3852 Set *EXPR, if EXPR not NULL, to any expression to be evaluated
3853 before the type name, and set *EXPR_CONST_OPERANDS, if
3854 EXPR_CONST_OPERANDS not NULL, to indicate whether the type name may
3855 appear in a constant expression. */
3858 groktypename (struct c_type_name
*type_name
, tree
*expr
,
3859 bool *expr_const_operands
)
3862 tree attrs
= type_name
->specs
->attrs
;
3864 type_name
->specs
->attrs
= NULL_TREE
;
3866 type
= grokdeclarator (type_name
->declarator
, type_name
->specs
, TYPENAME
,
3867 false, NULL
, &attrs
, expr
, expr_const_operands
,
3870 /* Apply attributes. */
3871 decl_attributes (&type
, attrs
, 0);
3876 /* Decode a declarator in an ordinary declaration or data definition.
3877 This is called as soon as the type information and variable name
3878 have been parsed, before parsing the initializer if any.
3879 Here we create the ..._DECL node, fill in its type,
3880 and put it on the list of decls for the current context.
3881 The ..._DECL node is returned as the value.
3883 Exception: for arrays where the length is not specified,
3884 the type is left null, to be filled in by `finish_decl'.
3886 Function definitions do not come here; they go to start_function
3887 instead. However, external and forward declarations of functions
3888 do go through here. Structure field declarations are done by
3889 grokfield and not through here. */
3892 start_decl (struct c_declarator
*declarator
, struct c_declspecs
*declspecs
,
3893 bool initialized
, tree attributes
)
3897 tree expr
= NULL_TREE
;
3898 enum deprecated_states deprecated_state
= DEPRECATED_NORMAL
;
3900 /* An object declared as __attribute__((deprecated)) suppresses
3901 warnings of uses of other deprecated items. */
3902 if (lookup_attribute ("deprecated", attributes
))
3903 deprecated_state
= DEPRECATED_SUPPRESS
;
3905 decl
= grokdeclarator (declarator
, declspecs
,
3906 NORMAL
, initialized
, NULL
, &attributes
, &expr
, NULL
,
3914 if (TREE_CODE (decl
) != FUNCTION_DECL
&& MAIN_NAME_P (DECL_NAME (decl
)))
3915 warning (OPT_Wmain
, "%q+D is usually a function", decl
);
3918 /* Is it valid for this decl to have an initializer at all?
3919 If not, set INITIALIZED to zero, which will indirectly
3920 tell 'finish_decl' to ignore the initializer once it is parsed. */
3921 switch (TREE_CODE (decl
))
3924 error ("typedef %qD is initialized (use __typeof__ instead)", decl
);
3929 error ("function %qD is initialized like a variable", decl
);
3934 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3935 error ("parameter %qD is initialized", decl
);
3940 /* Don't allow initializations for incomplete types except for
3941 arrays which might be completed by the initialization. */
3943 /* This can happen if the array size is an undefined macro.
3944 We already gave a warning, so we don't need another one. */
3945 if (TREE_TYPE (decl
) == error_mark_node
)
3947 else if (COMPLETE_TYPE_P (TREE_TYPE (decl
)))
3949 /* A complete type is ok if size is fixed. */
3951 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl
))) != INTEGER_CST
3952 || C_DECL_VARIABLE_SIZE (decl
))
3954 error ("variable-sized object may not be initialized");
3958 else if (TREE_CODE (TREE_TYPE (decl
)) != ARRAY_TYPE
)
3960 error ("variable %qD has initializer but incomplete type", decl
);
3963 else if (C_DECL_VARIABLE_SIZE (decl
))
3965 /* Although C99 is unclear about whether incomplete arrays
3966 of VLAs themselves count as VLAs, it does not make
3967 sense to permit them to be initialized given that
3968 ordinary VLAs may not be initialized. */
3969 error ("variable-sized object may not be initialized");
3976 if (current_scope
== file_scope
)
3977 TREE_STATIC (decl
) = 1;
3979 /* Tell 'pushdecl' this is an initialized decl
3980 even though we don't yet have the initializer expression.
3981 Also tell 'finish_decl' it may store the real initializer. */
3982 DECL_INITIAL (decl
) = error_mark_node
;
3985 /* If this is a function declaration, write a record describing it to the
3986 prototypes file (if requested). */
3988 if (TREE_CODE (decl
) == FUNCTION_DECL
)
3989 gen_aux_info_record (decl
, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl
)) != 0);
3991 /* ANSI specifies that a tentative definition which is not merged with
3992 a non-tentative definition behaves exactly like a definition with an
3993 initializer equal to zero. (Section 3.7.2)
3995 -fno-common gives strict ANSI behavior, though this tends to break
3996 a large body of code that grew up without this rule.
3998 Thread-local variables are never common, since there's no entrenched
3999 body of code to break, and it allows more efficient variable references
4000 in the presence of dynamic linking. */
4002 if (TREE_CODE (decl
) == VAR_DECL
4004 && TREE_PUBLIC (decl
)
4005 && !DECL_THREAD_LOCAL_P (decl
)
4007 DECL_COMMON (decl
) = 1;
4009 /* Set attributes here so if duplicate decl, will have proper attributes. */
4010 decl_attributes (&decl
, attributes
, 0);
4012 /* Handle gnu_inline attribute. */
4013 if (declspecs
->inline_p
4014 && !flag_gnu89_inline
4015 && TREE_CODE (decl
) == FUNCTION_DECL
4016 && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl
))
4017 || current_function_decl
))
4019 if (declspecs
->storage_class
== csc_auto
&& current_scope
!= file_scope
)
4021 else if (declspecs
->storage_class
!= csc_static
)
4022 DECL_EXTERNAL (decl
) = !DECL_EXTERNAL (decl
);
4025 if (TREE_CODE (decl
) == FUNCTION_DECL
4026 && targetm
.calls
.promote_prototypes (TREE_TYPE (decl
)))
4028 struct c_declarator
*ce
= declarator
;
4030 if (ce
->kind
== cdk_pointer
)
4031 ce
= declarator
->declarator
;
4032 if (ce
->kind
== cdk_function
)
4034 tree args
= ce
->u
.arg_info
->parms
;
4035 for (; args
; args
= TREE_CHAIN (args
))
4037 tree type
= TREE_TYPE (args
);
4038 if (type
&& INTEGRAL_TYPE_P (type
)
4039 && TYPE_PRECISION (type
) < TYPE_PRECISION (integer_type_node
))
4040 DECL_ARG_TYPE (args
) = integer_type_node
;
4045 if (TREE_CODE (decl
) == FUNCTION_DECL
4046 && DECL_DECLARED_INLINE_P (decl
)
4047 && DECL_UNINLINABLE (decl
)
4048 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl
)))
4049 warning (OPT_Wattributes
, "inline function %q+D given attribute noinline",
4052 /* C99 6.7.4p3: An inline definition of a function with external
4053 linkage shall not contain a definition of a modifiable object
4054 with static storage duration... */
4055 if (TREE_CODE (decl
) == VAR_DECL
4056 && current_scope
!= file_scope
4057 && TREE_STATIC (decl
)
4058 && !TREE_READONLY (decl
)
4059 && DECL_DECLARED_INLINE_P (current_function_decl
)
4060 && DECL_EXTERNAL (current_function_decl
))
4061 record_inline_static (input_location
, current_function_decl
,
4062 decl
, csi_modifiable
);
4064 /* Add this decl to the current scope.
4065 TEM may equal DECL or it may be a previous decl of the same name. */
4066 tem
= pushdecl (decl
);
4068 if (initialized
&& DECL_EXTERNAL (tem
))
4070 DECL_EXTERNAL (tem
) = 0;
4071 TREE_STATIC (tem
) = 1;
4077 /* Finish processing of a declaration;
4078 install its initial value.
4079 If ORIGTYPE is not NULL_TREE, it is the original type of INIT.
4080 If the length of an array type is not known before,
4081 it must be determined now, from the initial value, or it is an error.
4083 INIT_LOC is the location of the initial value. */
4086 finish_decl (tree decl
, location_t init_loc
, tree init
,
4087 tree origtype
, tree asmspec_tree
)
4090 bool was_incomplete
= (DECL_SIZE (decl
) == 0);
4091 const char *asmspec
= 0;
4093 /* If a name was specified, get the string. */
4094 if ((TREE_CODE (decl
) == FUNCTION_DECL
|| TREE_CODE (decl
) == VAR_DECL
)
4095 && DECL_FILE_SCOPE_P (decl
))
4096 asmspec_tree
= maybe_apply_renaming_pragma (decl
, asmspec_tree
);
4098 asmspec
= TREE_STRING_POINTER (asmspec_tree
);
4100 if (TREE_CODE (decl
) == VAR_DECL
4101 && TREE_STATIC (decl
)
4102 && global_bindings_p ())
4103 /* So decl is a global variable. Record the types it uses
4104 so that we can decide later to emit debug info for them. */
4105 record_types_used_by_current_var_decl (decl
);
4107 /* If `start_decl' didn't like having an initialization, ignore it now. */
4108 if (init
!= 0 && DECL_INITIAL (decl
) == 0)
4111 /* Don't crash if parm is initialized. */
4112 if (TREE_CODE (decl
) == PARM_DECL
)
4116 store_init_value (init_loc
, decl
, init
, origtype
);
4118 if (c_dialect_objc () && (TREE_CODE (decl
) == VAR_DECL
4119 || TREE_CODE (decl
) == FUNCTION_DECL
4120 || TREE_CODE (decl
) == FIELD_DECL
))
4121 objc_check_decl (decl
);
4123 type
= TREE_TYPE (decl
);
4125 /* Deduce size of array from initialization, if not already known. */
4126 if (TREE_CODE (type
) == ARRAY_TYPE
4127 && TYPE_DOMAIN (type
) == 0
4128 && TREE_CODE (decl
) != TYPE_DECL
)
4131 = (TREE_STATIC (decl
)
4132 /* Even if pedantic, an external linkage array
4133 may have incomplete type at first. */
4134 ? pedantic
&& !TREE_PUBLIC (decl
)
4135 : !DECL_EXTERNAL (decl
));
4137 = complete_array_type (&TREE_TYPE (decl
), DECL_INITIAL (decl
),
4140 /* Get the completed type made by complete_array_type. */
4141 type
= TREE_TYPE (decl
);
4146 error ("initializer fails to determine size of %q+D", decl
);
4151 error ("array size missing in %q+D", decl
);
4152 /* If a `static' var's size isn't known,
4153 make it extern as well as static, so it does not get
4155 If it is not `static', then do not mark extern;
4156 finish_incomplete_decl will give it a default size
4157 and it will get allocated. */
4158 else if (!pedantic
&& TREE_STATIC (decl
) && !TREE_PUBLIC (decl
))
4159 DECL_EXTERNAL (decl
) = 1;
4163 error ("zero or negative size array %q+D", decl
);
4167 /* For global variables, update the copy of the type that
4168 exists in the binding. */
4169 if (TREE_PUBLIC (decl
))
4171 struct c_binding
*b_ext
= I_SYMBOL_BINDING (DECL_NAME (decl
));
4172 while (b_ext
&& !B_IN_EXTERNAL_SCOPE (b_ext
))
4173 b_ext
= b_ext
->shadowed
;
4177 b_ext
->u
.type
= composite_type (b_ext
->u
.type
, type
);
4179 b_ext
->u
.type
= type
;
4188 if (DECL_INITIAL (decl
))
4189 TREE_TYPE (DECL_INITIAL (decl
)) = type
;
4191 layout_decl (decl
, 0);
4194 if (TREE_CODE (decl
) == VAR_DECL
)
4196 if (init
&& TREE_CODE (init
) == CONSTRUCTOR
)
4197 add_flexible_array_elts_to_size (decl
, init
);
4199 if (DECL_SIZE (decl
) == 0 && TREE_TYPE (decl
) != error_mark_node
4200 && COMPLETE_TYPE_P (TREE_TYPE (decl
)))
4201 layout_decl (decl
, 0);
4203 if (DECL_SIZE (decl
) == 0
4204 /* Don't give an error if we already gave one earlier. */
4205 && TREE_TYPE (decl
) != error_mark_node
4206 && (TREE_STATIC (decl
)
4207 /* A static variable with an incomplete type
4208 is an error if it is initialized.
4209 Also if it is not file scope.
4210 Otherwise, let it through, but if it is not `extern'
4211 then it may cause an error message later. */
4212 ? (DECL_INITIAL (decl
) != 0
4213 || !DECL_FILE_SCOPE_P (decl
))
4214 /* An automatic variable with an incomplete type
4216 : !DECL_EXTERNAL (decl
)))
4218 error ("storage size of %q+D isn%'t known", decl
);
4219 TREE_TYPE (decl
) = error_mark_node
;
4222 if ((DECL_EXTERNAL (decl
) || TREE_STATIC (decl
))
4223 && DECL_SIZE (decl
) != 0)
4225 if (TREE_CODE (DECL_SIZE (decl
)) == INTEGER_CST
)
4226 constant_expression_warning (DECL_SIZE (decl
));
4229 error ("storage size of %q+D isn%'t constant", decl
);
4230 TREE_TYPE (decl
) = error_mark_node
;
4234 if (TREE_USED (type
))
4235 TREE_USED (decl
) = 1;
4238 /* If this is a function and an assembler name is specified, reset DECL_RTL
4239 so we can give it its new name. Also, update built_in_decls if it
4240 was a normal built-in. */
4241 if (TREE_CODE (decl
) == FUNCTION_DECL
&& asmspec
)
4243 if (DECL_BUILT_IN_CLASS (decl
) == BUILT_IN_NORMAL
)
4244 set_builtin_user_assembler_name (decl
, asmspec
);
4245 set_user_assembler_name (decl
, asmspec
);
4248 /* If #pragma weak was used, mark the decl weak now. */
4249 maybe_apply_pragma_weak (decl
);
4251 /* Output the assembler code and/or RTL code for variables and functions,
4252 unless the type is an undefined structure or union.
4253 If not, it will get done when the type is completed. */
4255 if (TREE_CODE (decl
) == VAR_DECL
|| TREE_CODE (decl
) == FUNCTION_DECL
)
4257 /* Determine the ELF visibility. */
4258 if (TREE_PUBLIC (decl
))
4259 c_determine_visibility (decl
);
4261 /* This is a no-op in c-lang.c or something real in objc-act.c. */
4262 if (c_dialect_objc ())
4263 objc_check_decl (decl
);
4267 /* If this is not a static variable, issue a warning.
4268 It doesn't make any sense to give an ASMSPEC for an
4269 ordinary, non-register local variable. Historically,
4270 GCC has accepted -- but ignored -- the ASMSPEC in
4272 if (!DECL_FILE_SCOPE_P (decl
)
4273 && TREE_CODE (decl
) == VAR_DECL
4274 && !C_DECL_REGISTER (decl
)
4275 && !TREE_STATIC (decl
))
4276 warning (0, "ignoring asm-specifier for non-static local "
4277 "variable %q+D", decl
);
4279 set_user_assembler_name (decl
, asmspec
);
4282 if (DECL_FILE_SCOPE_P (decl
))
4284 if (DECL_INITIAL (decl
) == NULL_TREE
4285 || DECL_INITIAL (decl
) == error_mark_node
)
4286 /* Don't output anything
4287 when a tentative file-scope definition is seen.
4288 But at end of compilation, do output code for them. */
4289 DECL_DEFER_OUTPUT (decl
) = 1;
4290 rest_of_decl_compilation (decl
, true, 0);
4294 /* In conjunction with an ASMSPEC, the `register'
4295 keyword indicates that we should place the variable
4296 in a particular register. */
4297 if (asmspec
&& C_DECL_REGISTER (decl
))
4299 DECL_HARD_REGISTER (decl
) = 1;
4300 /* This cannot be done for a structure with volatile
4301 fields, on which DECL_REGISTER will have been
4303 if (!DECL_REGISTER (decl
))
4304 error ("cannot put object with volatile field into register");
4307 if (TREE_CODE (decl
) != FUNCTION_DECL
)
4309 /* If we're building a variable sized type, and we might be
4310 reachable other than via the top of the current binding
4311 level, then create a new BIND_EXPR so that we deallocate
4312 the object at the right time. */
4313 /* Note that DECL_SIZE can be null due to errors. */
4314 if (DECL_SIZE (decl
)
4315 && !TREE_CONSTANT (DECL_SIZE (decl
))
4316 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list
))
4319 bind
= build3 (BIND_EXPR
, void_type_node
, NULL
, NULL
, NULL
);
4320 TREE_SIDE_EFFECTS (bind
) = 1;
4322 BIND_EXPR_BODY (bind
) = push_stmt_list ();
4324 add_stmt (build_stmt (DECL_SOURCE_LOCATION (decl
),
4330 if (!DECL_FILE_SCOPE_P (decl
))
4332 /* Recompute the RTL of a local array now
4333 if it used to be an incomplete type. */
4335 && !TREE_STATIC (decl
) && !DECL_EXTERNAL (decl
))
4337 /* If we used it already as memory, it must stay in memory. */
4338 TREE_ADDRESSABLE (decl
) = TREE_USED (decl
);
4339 /* If it's still incomplete now, no init will save it. */
4340 if (DECL_SIZE (decl
) == 0)
4341 DECL_INITIAL (decl
) = 0;
4346 if (TREE_CODE (decl
) == TYPE_DECL
)
4348 if (!DECL_FILE_SCOPE_P (decl
)
4349 && variably_modified_type_p (TREE_TYPE (decl
), NULL_TREE
))
4350 add_stmt (build_stmt (DECL_SOURCE_LOCATION (decl
), DECL_EXPR
, decl
));
4352 rest_of_decl_compilation (decl
, DECL_FILE_SCOPE_P (decl
), 0);
4355 /* At the end of a declaration, throw away any variable type sizes
4356 of types defined inside that declaration. There is no use
4357 computing them in the following function definition. */
4358 if (current_scope
== file_scope
)
4359 get_pending_sizes ();
4361 /* Install a cleanup (aka destructor) if one was given. */
4362 if (TREE_CODE (decl
) == VAR_DECL
&& !TREE_STATIC (decl
))
4364 tree attr
= lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl
));
4367 tree cleanup_id
= TREE_VALUE (TREE_VALUE (attr
));
4368 tree cleanup_decl
= lookup_name (cleanup_id
);
4372 /* Build "cleanup(&decl)" for the destructor. */
4373 cleanup
= build_unary_op (input_location
, ADDR_EXPR
, decl
, 0);
4374 vec
= VEC_alloc (tree
, gc
, 1);
4375 VEC_quick_push (tree
, vec
, cleanup
);
4376 cleanup
= build_function_call_vec (DECL_SOURCE_LOCATION (decl
),
4377 cleanup_decl
, vec
, NULL
);
4378 VEC_free (tree
, gc
, vec
);
4380 /* Don't warn about decl unused; the cleanup uses it. */
4381 TREE_USED (decl
) = 1;
4382 TREE_USED (cleanup_decl
) = 1;
4384 push_cleanup (decl
, cleanup
, false);
4389 && TREE_CODE (decl
) == VAR_DECL
4390 && TREE_READONLY (decl
)
4391 && !DECL_EXTERNAL (decl
)
4392 && DECL_INITIAL (decl
) == NULL_TREE
)
4393 warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wc___compat
,
4394 "uninitialized const %qD is invalid in C++", decl
);
4397 /* Given a parsed parameter declaration, decode it into a PARM_DECL. */
4400 grokparm (const struct c_parm
*parm
)
4402 tree attrs
= parm
->attrs
;
4403 tree decl
= grokdeclarator (parm
->declarator
, parm
->specs
, PARM
, false,
4404 NULL
, &attrs
, NULL
, NULL
, DEPRECATED_NORMAL
);
4406 decl_attributes (&decl
, attrs
, 0);
4411 /* Given a parsed parameter declaration, decode it into a PARM_DECL
4412 and push that on the current scope. */
4415 push_parm_decl (const struct c_parm
*parm
)
4417 tree attrs
= parm
->attrs
;
4420 decl
= grokdeclarator (parm
->declarator
, parm
->specs
, PARM
, false, NULL
,
4421 &attrs
, NULL
, NULL
, DEPRECATED_NORMAL
);
4422 decl_attributes (&decl
, attrs
, 0);
4424 decl
= pushdecl (decl
);
4426 finish_decl (decl
, input_location
, NULL_TREE
, NULL_TREE
, NULL_TREE
);
4429 /* Mark all the parameter declarations to date as forward decls.
4430 Also diagnose use of this extension. */
4433 mark_forward_parm_decls (void)
4435 struct c_binding
*b
;
4437 if (pedantic
&& !current_scope
->warned_forward_parm_decls
)
4439 pedwarn (input_location
, OPT_pedantic
,
4440 "ISO C forbids forward parameter declarations");
4441 current_scope
->warned_forward_parm_decls
= true;
4444 for (b
= current_scope
->bindings
; b
; b
= b
->prev
)
4445 if (TREE_CODE (b
->decl
) == PARM_DECL
)
4446 TREE_ASM_WRITTEN (b
->decl
) = 1;
4449 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
4450 literal, which may be an incomplete array type completed by the
4451 initializer; INIT is a CONSTRUCTOR at LOC that initializes the compound
4452 literal. NON_CONST is true if the initializers contain something
4453 that cannot occur in a constant expression. */
4456 build_compound_literal (location_t loc
, tree type
, tree init
, bool non_const
)
4458 /* We do not use start_decl here because we have a type, not a declarator;
4459 and do not use finish_decl because the decl should be stored inside
4460 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_EXPR. */
4465 if (type
== error_mark_node
)
4466 return error_mark_node
;
4468 decl
= build_decl (loc
, VAR_DECL
, NULL_TREE
, type
);
4469 DECL_EXTERNAL (decl
) = 0;
4470 TREE_PUBLIC (decl
) = 0;
4471 TREE_STATIC (decl
) = (current_scope
== file_scope
);
4472 DECL_CONTEXT (decl
) = current_function_decl
;
4473 TREE_USED (decl
) = 1;
4474 TREE_TYPE (decl
) = type
;
4475 TREE_READONLY (decl
) = TYPE_READONLY (type
);
4476 store_init_value (loc
, decl
, init
, NULL_TREE
);
4478 if (TREE_CODE (type
) == ARRAY_TYPE
&& !COMPLETE_TYPE_P (type
))
4480 int failure
= complete_array_type (&TREE_TYPE (decl
),
4481 DECL_INITIAL (decl
), true);
4482 gcc_assert (!failure
);
4484 type
= TREE_TYPE (decl
);
4485 TREE_TYPE (DECL_INITIAL (decl
)) = type
;
4488 if (type
== error_mark_node
|| !COMPLETE_TYPE_P (type
))
4489 return error_mark_node
;
4491 stmt
= build_stmt (DECL_SOURCE_LOCATION (decl
), DECL_EXPR
, decl
);
4492 complit
= build1 (COMPOUND_LITERAL_EXPR
, type
, stmt
);
4493 TREE_SIDE_EFFECTS (complit
) = 1;
4495 layout_decl (decl
, 0);
4497 if (TREE_STATIC (decl
))
4499 /* This decl needs a name for the assembler output. */
4500 set_compound_literal_name (decl
);
4501 DECL_DEFER_OUTPUT (decl
) = 1;
4502 DECL_COMDAT (decl
) = 1;
4503 DECL_ARTIFICIAL (decl
) = 1;
4504 DECL_IGNORED_P (decl
) = 1;
4506 rest_of_decl_compilation (decl
, 1, 0);
4511 complit
= build2 (C_MAYBE_CONST_EXPR
, type
, NULL
, complit
);
4512 C_MAYBE_CONST_EXPR_NON_CONST (complit
) = 1;
4518 /* Check the type of a compound literal. Here we just check that it
4519 is valid for C++. */
4522 check_compound_literal_type (location_t loc
, struct c_type_name
*type_name
)
4524 if (warn_cxx_compat
&& type_name
->specs
->tag_defined_p
)
4525 warning_at (loc
, OPT_Wc___compat
,
4526 "defining a type in a compound literal is invalid in C++");
4529 /* Determine whether TYPE is a structure with a flexible array member,
4530 or a union containing such a structure (possibly recursively). */
4533 flexible_array_type_p (tree type
)
4536 switch (TREE_CODE (type
))
4539 x
= TYPE_FIELDS (type
);
4542 while (TREE_CHAIN (x
) != NULL_TREE
)
4544 if (TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
4545 && TYPE_SIZE (TREE_TYPE (x
)) == NULL_TREE
4546 && TYPE_DOMAIN (TREE_TYPE (x
)) != NULL_TREE
4547 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x
))) == NULL_TREE
)
4551 for (x
= TYPE_FIELDS (type
); x
!= NULL_TREE
; x
= TREE_CHAIN (x
))
4553 if (flexible_array_type_p (TREE_TYPE (x
)))
4562 /* Performs sanity checks on the TYPE and WIDTH of the bit-field NAME,
4563 replacing with appropriate values if they are invalid. */
4565 check_bitfield_type_and_width (tree
*type
, tree
*width
, tree orig_name
)
4568 unsigned int max_width
;
4569 unsigned HOST_WIDE_INT w
;
4570 const char *name
= (orig_name
4571 ? identifier_to_locale (IDENTIFIER_POINTER (orig_name
))
4572 : _("<anonymous>"));
4574 /* Detect and ignore out of range field width and process valid
4576 if (!INTEGRAL_TYPE_P (TREE_TYPE (*width
)))
4578 error ("bit-field %qs width not an integer constant", name
);
4579 *width
= integer_one_node
;
4583 if (TREE_CODE (*width
) != INTEGER_CST
)
4585 *width
= c_fully_fold (*width
, false, NULL
);
4586 if (TREE_CODE (*width
) == INTEGER_CST
)
4587 pedwarn (input_location
, OPT_pedantic
,
4588 "bit-field %qs width not an integer constant expression",
4591 if (TREE_CODE (*width
) != INTEGER_CST
)
4593 error ("bit-field %qs width not an integer constant", name
);
4594 *width
= integer_one_node
;
4596 constant_expression_warning (*width
);
4597 if (tree_int_cst_sgn (*width
) < 0)
4599 error ("negative width in bit-field %qs", name
);
4600 *width
= integer_one_node
;
4602 else if (integer_zerop (*width
) && orig_name
)
4604 error ("zero width for bit-field %qs", name
);
4605 *width
= integer_one_node
;
4609 /* Detect invalid bit-field type. */
4610 if (TREE_CODE (*type
) != INTEGER_TYPE
4611 && TREE_CODE (*type
) != BOOLEAN_TYPE
4612 && TREE_CODE (*type
) != ENUMERAL_TYPE
)
4614 error ("bit-field %qs has invalid type", name
);
4615 *type
= unsigned_type_node
;
4618 type_mv
= TYPE_MAIN_VARIANT (*type
);
4619 if (!in_system_header
4620 && type_mv
!= integer_type_node
4621 && type_mv
!= unsigned_type_node
4622 && type_mv
!= boolean_type_node
)
4623 pedwarn (input_location
, OPT_pedantic
,
4624 "type of bit-field %qs is a GCC extension", name
);
4626 max_width
= TYPE_PRECISION (*type
);
4628 if (0 < compare_tree_int (*width
, max_width
))
4630 error ("width of %qs exceeds its type", name
);
4632 *width
= build_int_cst (NULL_TREE
, w
);
4635 w
= tree_low_cst (*width
, 1);
4637 if (TREE_CODE (*type
) == ENUMERAL_TYPE
)
4639 struct lang_type
*lt
= TYPE_LANG_SPECIFIC (*type
);
4641 || w
< tree_int_cst_min_precision (lt
->enum_min
, TYPE_UNSIGNED (*type
))
4642 || w
< tree_int_cst_min_precision (lt
->enum_max
, TYPE_UNSIGNED (*type
)))
4643 warning (0, "%qs is narrower than values of its type", name
);
4649 /* Print warning about variable length array if necessary. */
4652 warn_variable_length_array (tree name
, tree size
)
4654 int const_size
= TREE_CONSTANT (size
);
4656 if (!flag_isoc99
&& pedantic
&& warn_vla
!= 0)
4661 pedwarn (input_location
, OPT_Wvla
,
4662 "ISO C90 forbids array %qE whose size "
4663 "can%'t be evaluated",
4666 pedwarn (input_location
, OPT_Wvla
, "ISO C90 forbids array whose size "
4667 "can%'t be evaluated");
4672 pedwarn (input_location
, OPT_Wvla
,
4673 "ISO C90 forbids variable length array %qE",
4676 pedwarn (input_location
, OPT_Wvla
, "ISO C90 forbids variable length array");
4679 else if (warn_vla
> 0)
4685 "the size of array %qE can"
4686 "%'t be evaluated", name
);
4689 "the size of array can %'t be evaluated");
4695 "variable length array %qE is used",
4699 "variable length array is used");
4704 /* Given a size SIZE that may not be a constant, return a SAVE_EXPR to
4705 serve as the actual size-expression for a type or decl. This is
4706 like variable_size in stor-layout.c, but we make global_bindings_p
4707 return negative to avoid calls to that function from outside the
4708 front end resulting in errors at file scope, then call this version
4709 instead from front-end code. */
4712 c_variable_size (tree size
)
4716 if (TREE_CONSTANT (size
))
4719 size
= save_expr (size
);
4721 save
= skip_simple_arithmetic (size
);
4723 if (cfun
&& cfun
->dont_save_pending_sizes_p
)
4726 if (!global_bindings_p ())
4727 put_pending_size (save
);
4732 /* Given declspecs and a declarator,
4733 determine the name and type of the object declared
4734 and construct a ..._DECL node for it.
4735 (In one case we can return a ..._TYPE node instead.
4736 For invalid input we sometimes return 0.)
4738 DECLSPECS is a c_declspecs structure for the declaration specifiers.
4740 DECL_CONTEXT says which syntactic context this declaration is in:
4741 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
4742 FUNCDEF for a function definition. Like NORMAL but a few different
4743 error messages in each case. Return value may be zero meaning
4744 this definition is too screwy to try to parse.
4745 PARM for a parameter declaration (either within a function prototype
4746 or before a function body). Make a PARM_DECL, or return void_type_node.
4747 TYPENAME if for a typename (in a cast or sizeof).
4748 Don't make a DECL node; just return the ..._TYPE node.
4749 FIELD for a struct or union field; make a FIELD_DECL.
4750 INITIALIZED is true if the decl has an initializer.
4751 WIDTH is non-NULL for bit-fields, and is a pointer to an INTEGER_CST node
4752 representing the width of the bit-field.
4753 DECL_ATTRS points to the list of attributes that should be added to this
4754 decl. Any nested attributes that belong on the decl itself will be
4756 If EXPR is not NULL, any expressions that need to be evaluated as
4757 part of evaluating variably modified types will be stored in *EXPR.
4758 If EXPR_CONST_OPERANDS is not NULL, *EXPR_CONST_OPERANDS will be
4759 set to indicate whether operands in *EXPR can be used in constant
4761 DEPRECATED_STATE is a deprecated_states value indicating whether
4762 deprecation warnings should be suppressed.
4764 In the TYPENAME case, DECLARATOR is really an absolute declarator.
4765 It may also be so in the PARM case, for a prototype where the
4766 argument type is specified but not the name.
4768 This function is where the complicated C meanings of `static'
4769 and `extern' are interpreted. */
4772 grokdeclarator (const struct c_declarator
*declarator
,
4773 struct c_declspecs
*declspecs
,
4774 enum decl_context decl_context
, bool initialized
, tree
*width
,
4775 tree
*decl_attrs
, tree
*expr
, bool *expr_const_operands
,
4776 enum deprecated_states deprecated_state
)
4778 tree type
= declspecs
->type
;
4779 bool threadp
= declspecs
->thread_p
;
4780 enum c_storage_class storage_class
= declspecs
->storage_class
;
4784 int type_quals
= TYPE_UNQUALIFIED
;
4785 tree name
= NULL_TREE
;
4786 bool funcdef_flag
= false;
4787 bool funcdef_syntax
= false;
4788 bool size_varies
= false;
4789 tree decl_attr
= declspecs
->decl_attr
;
4790 int array_ptr_quals
= TYPE_UNQUALIFIED
;
4791 tree array_ptr_attrs
= NULL_TREE
;
4792 int array_parm_static
= 0;
4793 bool array_parm_vla_unspec_p
= false;
4794 tree returned_attrs
= NULL_TREE
;
4795 bool bitfield
= width
!= NULL
;
4797 struct c_arg_info
*arg_info
= 0;
4798 addr_space_t as1
, as2
, address_space
;
4799 location_t loc
= UNKNOWN_LOCATION
;
4802 bool expr_const_operands_dummy
;
4806 if (expr_const_operands
== NULL
)
4807 expr_const_operands
= &expr_const_operands_dummy
;
4809 *expr
= declspecs
->expr
;
4810 *expr_const_operands
= declspecs
->expr_const_operands
;
4812 if (decl_context
== FUNCDEF
)
4813 funcdef_flag
= true, decl_context
= NORMAL
;
4815 /* Look inside a declarator for the name being declared
4816 and get it as an IDENTIFIER_NODE, for an error message. */
4818 const struct c_declarator
*decl
= declarator
;
4829 funcdef_syntax
= (decl
->kind
== cdk_function
);
4830 decl
= decl
->declarator
;
4834 decl
= decl
->declarator
;
4849 gcc_assert (decl_context
== PARM
4850 || decl_context
== TYPENAME
4851 || (decl_context
== FIELD
4852 && declarator
->kind
== cdk_id
));
4853 gcc_assert (!initialized
);
4857 /* A function definition's declarator must have the form of
4858 a function declarator. */
4860 if (funcdef_flag
&& !funcdef_syntax
)
4863 /* If this looks like a function definition, make it one,
4864 even if it occurs where parms are expected.
4865 Then store_parm_decls will reject it and not use it as a parm. */
4866 if (decl_context
== NORMAL
&& !funcdef_flag
&& current_scope
->parm_flag
)
4867 decl_context
= PARM
;
4869 if (declspecs
->deprecated_p
&& deprecated_state
!= DEPRECATED_SUPPRESS
)
4870 warn_deprecated_use (declspecs
->type
, declspecs
->decl_attr
);
4872 if ((decl_context
== NORMAL
|| decl_context
== FIELD
)
4873 && current_scope
== file_scope
4874 && variably_modified_type_p (type
, NULL_TREE
))
4877 error_at (loc
, "variably modified %qE at file scope", name
);
4879 error_at (loc
, "variably modified field at file scope");
4880 type
= integer_type_node
;
4883 size_varies
= C_TYPE_VARIABLE_SIZE (type
) != 0;
4885 /* Diagnose defaulting to "int". */
4887 if (declspecs
->default_int_p
&& !in_system_header
)
4889 /* Issue a warning if this is an ISO C 99 program or if
4890 -Wreturn-type and this is a function, or if -Wimplicit;
4891 prefer the former warning since it is more explicit. */
4892 if ((warn_implicit_int
|| warn_return_type
|| flag_isoc99
)
4894 warn_about_return_type
= 1;
4898 pedwarn_c99 (loc
, flag_isoc99
? 0 : OPT_Wimplicit_int
,
4899 "type defaults to %<int%> in declaration of %qE",
4902 pedwarn_c99 (input_location
, flag_isoc99
? 0 : OPT_Wimplicit_int
,
4903 "type defaults to %<int%> in type name");
4907 /* Adjust the type if a bit-field is being declared,
4908 -funsigned-bitfields applied and the type is not explicitly
4910 if (bitfield
&& !flag_signed_bitfields
&& !declspecs
->explicit_signed_p
4911 && TREE_CODE (type
) == INTEGER_TYPE
)
4912 type
= unsigned_type_for (type
);
4914 /* Figure out the type qualifiers for the declaration. There are
4915 two ways a declaration can become qualified. One is something
4916 like `const int i' where the `const' is explicit. Another is
4917 something like `typedef const int CI; CI i' where the type of the
4918 declaration contains the `const'. A third possibility is that
4919 there is a type qualifier on the element type of a typedefed
4920 array type, in which case we should extract that qualifier so
4921 that c_apply_type_quals_to_decl receives the full list of
4922 qualifiers to work with (C90 is not entirely clear about whether
4923 duplicate qualifiers should be diagnosed in this case, but it
4924 seems most appropriate to do so). */
4925 element_type
= strip_array_types (type
);
4926 constp
= declspecs
->const_p
+ TYPE_READONLY (element_type
);
4927 restrictp
= declspecs
->restrict_p
+ TYPE_RESTRICT (element_type
);
4928 volatilep
= declspecs
->volatile_p
+ TYPE_VOLATILE (element_type
);
4929 as1
= declspecs
->address_space
;
4930 as2
= TYPE_ADDR_SPACE (element_type
);
4931 address_space
= ADDR_SPACE_GENERIC_P (as1
)? as2
: as1
;
4933 if (pedantic
&& !flag_isoc99
)
4936 pedwarn (loc
, OPT_pedantic
, "duplicate %<const%>");
4938 pedwarn (loc
, OPT_pedantic
, "duplicate %<restrict%>");
4940 pedwarn (loc
, OPT_pedantic
, "duplicate %<volatile%>");
4943 if (!ADDR_SPACE_GENERIC_P (as1
) && !ADDR_SPACE_GENERIC_P (as2
) && as1
!= as2
)
4944 error_at (loc
, "conflicting named address spaces (%s vs %s)",
4945 c_addr_space_name (as1
), c_addr_space_name (as2
));
4947 if (!flag_gen_aux_info
&& (TYPE_QUALS (element_type
)))
4948 type
= TYPE_MAIN_VARIANT (type
);
4949 type_quals
= ((constp
? TYPE_QUAL_CONST
: 0)
4950 | (restrictp
? TYPE_QUAL_RESTRICT
: 0)
4951 | (volatilep
? TYPE_QUAL_VOLATILE
: 0)
4952 | ENCODE_QUAL_ADDR_SPACE (address_space
));
4954 /* Warn about storage classes that are invalid for certain
4955 kinds of declarations (parameters, typenames, etc.). */
4959 || storage_class
== csc_auto
4960 || storage_class
== csc_register
4961 || storage_class
== csc_typedef
))
4963 if (storage_class
== csc_auto
)
4965 (current_scope
== file_scope
) ? 0 : OPT_pedantic
,
4966 "function definition declared %<auto%>");
4967 if (storage_class
== csc_register
)
4968 error_at (loc
, "function definition declared %<register%>");
4969 if (storage_class
== csc_typedef
)
4970 error_at (loc
, "function definition declared %<typedef%>");
4972 error_at (loc
, "function definition declared %<__thread%>");
4974 if (storage_class
== csc_auto
4975 || storage_class
== csc_register
4976 || storage_class
== csc_typedef
)
4977 storage_class
= csc_none
;
4979 else if (decl_context
!= NORMAL
&& (storage_class
!= csc_none
|| threadp
))
4981 if (decl_context
== PARM
&& storage_class
== csc_register
)
4985 switch (decl_context
)
4989 error_at (loc
, "storage class specified for structure "
4992 error_at (loc
, "storage class specified for structure field");
4996 error_at (loc
, "storage class specified for parameter %qE",
4999 error_at (loc
, "storage class specified for unnamed parameter");
5002 error_at (loc
, "storage class specified for typename");
5005 storage_class
= csc_none
;
5009 else if (storage_class
== csc_extern
5013 /* 'extern' with initialization is invalid if not at file scope. */
5014 if (current_scope
== file_scope
)
5016 /* It is fine to have 'extern const' when compiling at C
5017 and C++ intersection. */
5018 if (!(warn_cxx_compat
&& constp
))
5019 warning_at (loc
, 0, "%qE initialized and declared %<extern%>",
5023 error_at (loc
, "%qE has both %<extern%> and initializer", name
);
5025 else if (current_scope
== file_scope
)
5027 if (storage_class
== csc_auto
)
5028 error_at (loc
, "file-scope declaration of %qE specifies %<auto%>",
5030 if (pedantic
&& storage_class
== csc_register
)
5031 pedwarn (input_location
, OPT_pedantic
,
5032 "file-scope declaration of %qE specifies %<register%>", name
);
5036 if (storage_class
== csc_extern
&& funcdef_flag
)
5037 error_at (loc
, "nested function %qE declared %<extern%>", name
);
5038 else if (threadp
&& storage_class
== csc_none
)
5040 error_at (loc
, "function-scope %qE implicitly auto and declared "
5047 /* Now figure out the structure of the declarator proper.
5048 Descend through it, creating more complex types, until we reach
5049 the declared identifier (or NULL_TREE, in an absolute declarator).
5050 At each stage we maintain an unqualified version of the type
5051 together with any qualifiers that should be applied to it with
5052 c_build_qualified_type; this way, array types including
5053 multidimensional array types are first built up in unqualified
5054 form and then the qualified form is created with
5055 TYPE_MAIN_VARIANT pointing to the unqualified form. */
5057 while (declarator
&& declarator
->kind
!= cdk_id
)
5059 if (type
== error_mark_node
)
5061 declarator
= declarator
->declarator
;
5065 /* Each level of DECLARATOR is either a cdk_array (for ...[..]),
5066 a cdk_pointer (for *...),
5067 a cdk_function (for ...(...)),
5068 a cdk_attrs (for nested attributes),
5069 or a cdk_id (for the name being declared
5070 or the place in an absolute declarator
5071 where the name was omitted).
5072 For the last case, we have just exited the loop.
5074 At this point, TYPE is the type of elements of an array,
5075 or for a function to return, or for a pointer to point to.
5076 After this sequence of ifs, TYPE is the type of the
5077 array or function or pointer, and DECLARATOR has had its
5078 outermost layer removed. */
5080 if (array_ptr_quals
!= TYPE_UNQUALIFIED
5081 || array_ptr_attrs
!= NULL_TREE
5082 || array_parm_static
)
5084 /* Only the innermost declarator (making a parameter be of
5085 array type which is converted to pointer type)
5086 may have static or type qualifiers. */
5087 error_at (loc
, "static or type qualifiers in non-parameter array declarator");
5088 array_ptr_quals
= TYPE_UNQUALIFIED
;
5089 array_ptr_attrs
= NULL_TREE
;
5090 array_parm_static
= 0;
5093 switch (declarator
->kind
)
5097 /* A declarator with embedded attributes. */
5098 tree attrs
= declarator
->u
.attrs
;
5099 const struct c_declarator
*inner_decl
;
5101 declarator
= declarator
->declarator
;
5102 inner_decl
= declarator
;
5103 while (inner_decl
->kind
== cdk_attrs
)
5104 inner_decl
= inner_decl
->declarator
;
5105 if (inner_decl
->kind
== cdk_id
)
5106 attr_flags
|= (int) ATTR_FLAG_DECL_NEXT
;
5107 else if (inner_decl
->kind
== cdk_function
)
5108 attr_flags
|= (int) ATTR_FLAG_FUNCTION_NEXT
;
5109 else if (inner_decl
->kind
== cdk_array
)
5110 attr_flags
|= (int) ATTR_FLAG_ARRAY_NEXT
;
5111 returned_attrs
= decl_attributes (&type
,
5112 chainon (returned_attrs
, attrs
),
5118 tree itype
= NULL_TREE
;
5119 tree size
= declarator
->u
.array
.dimen
;
5120 /* The index is a signed object `sizetype' bits wide. */
5121 tree index_type
= c_common_signed_type (sizetype
);
5123 array_ptr_quals
= declarator
->u
.array
.quals
;
5124 array_ptr_attrs
= declarator
->u
.array
.attrs
;
5125 array_parm_static
= declarator
->u
.array
.static_p
;
5126 array_parm_vla_unspec_p
= declarator
->u
.array
.vla_unspec_p
;
5128 declarator
= declarator
->declarator
;
5130 /* Check for some types that there cannot be arrays of. */
5132 if (VOID_TYPE_P (type
))
5135 error_at (loc
, "declaration of %qE as array of voids", name
);
5137 error_at (loc
, "declaration of type name as array of voids");
5138 type
= error_mark_node
;
5141 if (TREE_CODE (type
) == FUNCTION_TYPE
)
5144 error_at (loc
, "declaration of %qE as array of functions",
5147 error_at (loc
, "declaration of type name as array of "
5149 type
= error_mark_node
;
5152 if (pedantic
&& !in_system_header
&& flexible_array_type_p (type
))
5153 pedwarn (loc
, OPT_pedantic
,
5154 "invalid use of structure with flexible array member");
5156 if (size
== error_mark_node
)
5157 type
= error_mark_node
;
5159 if (type
== error_mark_node
)
5162 /* If size was specified, set ITYPE to a range-type for
5163 that size. Otherwise, ITYPE remains null. finish_decl
5164 may figure it out from an initial value. */
5168 bool size_maybe_const
= true;
5169 bool size_int_const
= (TREE_CODE (size
) == INTEGER_CST
5170 && !TREE_OVERFLOW (size
));
5171 bool this_size_varies
= false;
5173 /* Strip NON_LVALUE_EXPRs since we aren't using as an
5175 STRIP_TYPE_NOPS (size
);
5177 if (!INTEGRAL_TYPE_P (TREE_TYPE (size
)))
5180 error_at (loc
, "size of array %qE has non-integer type",
5184 "size of unnamed array has non-integer type");
5185 size
= integer_one_node
;
5188 size
= c_fully_fold (size
, false, &size_maybe_const
);
5190 if (pedantic
&& size_maybe_const
&& integer_zerop (size
))
5193 pedwarn (loc
, OPT_pedantic
,
5194 "ISO C forbids zero-size array %qE", name
);
5196 pedwarn (loc
, OPT_pedantic
,
5197 "ISO C forbids zero-size array");
5200 if (TREE_CODE (size
) == INTEGER_CST
&& size_maybe_const
)
5202 constant_expression_warning (size
);
5203 if (tree_int_cst_sgn (size
) < 0)
5206 error_at (loc
, "size of array %qE is negative", name
);
5208 error_at (loc
, "size of unnamed array is negative");
5209 size
= integer_one_node
;
5211 /* Handle a size folded to an integer constant but
5212 not an integer constant expression. */
5213 if (!size_int_const
)
5215 /* If this is a file scope declaration of an
5216 ordinary identifier, this is invalid code;
5217 diagnosing it here and not subsequently
5218 treating the type as variable-length avoids
5219 more confusing diagnostics later. */
5220 if ((decl_context
== NORMAL
|| decl_context
== FIELD
)
5221 && current_scope
== file_scope
)
5222 pedwarn (input_location
, 0,
5223 "variably modified %qE at file scope",
5226 this_size_varies
= size_varies
= true;
5227 warn_variable_length_array (name
, size
);
5230 else if ((decl_context
== NORMAL
|| decl_context
== FIELD
)
5231 && current_scope
== file_scope
)
5233 error_at (loc
, "variably modified %qE at file scope", name
);
5234 size
= integer_one_node
;
5238 /* Make sure the array size remains visibly
5239 nonconstant even if it is (eg) a const variable
5240 with known value. */
5241 this_size_varies
= size_varies
= true;
5242 warn_variable_length_array (name
, size
);
5245 if (integer_zerop (size
) && !this_size_varies
)
5247 /* A zero-length array cannot be represented with
5248 an unsigned index type, which is what we'll
5249 get with build_index_type. Create an
5250 open-ended range instead. */
5251 itype
= build_range_type (sizetype
, size
, NULL_TREE
);
5255 /* Arrange for the SAVE_EXPR on the inside of the
5256 MINUS_EXPR, which allows the -1 to get folded
5257 with the +1 that happens when building TYPE_SIZE. */
5259 size
= c_variable_size (size
);
5260 if (this_size_varies
&& TREE_CODE (size
) == INTEGER_CST
)
5261 size
= build2 (COMPOUND_EXPR
, TREE_TYPE (size
),
5262 integer_zero_node
, size
);
5264 /* Compute the maximum valid index, that is, size
5265 - 1. Do the calculation in index_type, so that
5266 if it is a variable the computations will be
5267 done in the proper mode. */
5268 itype
= fold_build2_loc (loc
, MINUS_EXPR
, index_type
,
5269 convert (index_type
, size
),
5270 convert (index_type
,
5273 /* If that overflowed, the array is too big. ???
5274 While a size of INT_MAX+1 technically shouldn't
5275 cause an overflow (because we subtract 1), the
5276 overflow is recorded during the conversion to
5277 index_type, before the subtraction. Handling
5278 this case seems like an unnecessary
5280 if (TREE_CODE (itype
) == INTEGER_CST
5281 && TREE_OVERFLOW (itype
))
5284 error_at (loc
, "size of array %qE is too large",
5287 error_at (loc
, "size of unnamed array is too large");
5288 type
= error_mark_node
;
5292 itype
= build_index_type (itype
);
5294 if (this_size_varies
)
5297 *expr
= build2 (COMPOUND_EXPR
, TREE_TYPE (size
),
5301 *expr_const_operands
&= size_maybe_const
;
5304 else if (decl_context
== FIELD
)
5306 bool flexible_array_member
= false;
5307 if (array_parm_vla_unspec_p
)
5308 /* Field names can in fact have function prototype
5309 scope so [*] is disallowed here through making
5310 the field variably modified, not through being
5311 something other than a declaration with function
5316 const struct c_declarator
*t
= declarator
;
5317 while (t
->kind
== cdk_attrs
)
5319 flexible_array_member
= (t
->kind
== cdk_id
);
5321 if (flexible_array_member
5322 && pedantic
&& !flag_isoc99
&& !in_system_header
)
5323 pedwarn (loc
, OPT_pedantic
,
5324 "ISO C90 does not support flexible array members");
5326 /* ISO C99 Flexible array members are effectively
5327 identical to GCC's zero-length array extension. */
5328 if (flexible_array_member
|| array_parm_vla_unspec_p
)
5329 itype
= build_range_type (sizetype
, size_zero_node
,
5332 else if (decl_context
== PARM
)
5334 if (array_parm_vla_unspec_p
)
5336 itype
= build_range_type (sizetype
, size_zero_node
, NULL_TREE
);
5340 else if (decl_context
== TYPENAME
)
5342 if (array_parm_vla_unspec_p
)
5345 warning (0, "%<[*]%> not in a declaration");
5346 /* We use this to avoid messing up with incomplete
5347 array types of the same type, that would
5348 otherwise be modified below. */
5349 itype
= build_range_type (sizetype
, size_zero_node
,
5355 /* Complain about arrays of incomplete types. */
5356 if (!COMPLETE_TYPE_P (type
))
5358 error_at (loc
, "array type has incomplete element type");
5359 type
= error_mark_node
;
5362 /* When itype is NULL, a shared incomplete array type is
5363 returned for all array of a given type. Elsewhere we
5364 make sure we don't complete that type before copying
5365 it, but here we want to make sure we don't ever
5366 modify the shared type, so we gcc_assert (itype)
5369 addr_space_t as
= DECODE_QUAL_ADDR_SPACE (type_quals
);
5370 if (!ADDR_SPACE_GENERIC_P (as
) && as
!= TYPE_ADDR_SPACE (type
))
5371 type
= build_qualified_type (type
,
5372 ENCODE_QUAL_ADDR_SPACE (as
));
5374 type
= build_array_type (type
, itype
);
5377 if (type
!= error_mark_node
)
5381 /* It is ok to modify type here even if itype is
5382 NULL: if size_varies, we're in a
5383 multi-dimensional array and the inner type has
5384 variable size, so the enclosing shared array type
5386 if (size
&& TREE_CODE (size
) == INTEGER_CST
)
5388 = build_distinct_type_copy (TYPE_MAIN_VARIANT (type
));
5389 C_TYPE_VARIABLE_SIZE (type
) = 1;
5392 /* The GCC extension for zero-length arrays differs from
5393 ISO flexible array members in that sizeof yields
5395 if (size
&& integer_zerop (size
))
5398 TYPE_SIZE (type
) = bitsize_zero_node
;
5399 TYPE_SIZE_UNIT (type
) = size_zero_node
;
5400 SET_TYPE_STRUCTURAL_EQUALITY (type
);
5402 if (array_parm_vla_unspec_p
)
5405 /* The type is complete. C99 6.7.5.2p4 */
5406 TYPE_SIZE (type
) = bitsize_zero_node
;
5407 TYPE_SIZE_UNIT (type
) = size_zero_node
;
5408 SET_TYPE_STRUCTURAL_EQUALITY (type
);
5412 if (decl_context
!= PARM
5413 && (array_ptr_quals
!= TYPE_UNQUALIFIED
5414 || array_ptr_attrs
!= NULL_TREE
5415 || array_parm_static
))
5417 error_at (loc
, "static or type qualifiers in non-parameter array declarator");
5418 array_ptr_quals
= TYPE_UNQUALIFIED
;
5419 array_ptr_attrs
= NULL_TREE
;
5420 array_parm_static
= 0;
5426 /* Say it's a definition only for the declarator closest
5427 to the identifier, apart possibly from some
5429 bool really_funcdef
= false;
5433 const struct c_declarator
*t
= declarator
->declarator
;
5434 while (t
->kind
== cdk_attrs
)
5436 really_funcdef
= (t
->kind
== cdk_id
);
5439 /* Declaring a function type. Make sure we have a valid
5440 type for the function to return. */
5441 if (type
== error_mark_node
)
5444 size_varies
= false;
5446 /* Warn about some types functions can't return. */
5447 if (TREE_CODE (type
) == FUNCTION_TYPE
)
5450 error_at (loc
, "%qE declared as function returning a "
5453 error_at (loc
, "type name declared as function "
5454 "returning a function");
5455 type
= integer_type_node
;
5457 if (TREE_CODE (type
) == ARRAY_TYPE
)
5460 error_at (loc
, "%qE declared as function returning an array",
5463 error_at (loc
, "type name declared as function returning "
5465 type
= integer_type_node
;
5467 errmsg
= targetm
.invalid_return_type (type
);
5471 type
= integer_type_node
;
5474 /* Construct the function type and go to the next
5475 inner layer of declarator. */
5476 arg_info
= declarator
->u
.arg_info
;
5477 arg_types
= grokparms (arg_info
, really_funcdef
);
5479 put_pending_sizes (arg_info
->pending_sizes
);
5481 /* Type qualifiers before the return type of the function
5482 qualify the return type, not the function type. */
5485 /* Type qualifiers on a function return type are
5486 normally permitted by the standard but have no
5487 effect, so give a warning at -Wreturn-type.
5488 Qualifiers on a void return type are banned on
5489 function definitions in ISO C; GCC used to used
5490 them for noreturn functions. */
5491 if (VOID_TYPE_P (type
) && really_funcdef
)
5493 "function definition has qualified void return type");
5495 warning_at (loc
, OPT_Wignored_qualifiers
,
5496 "type qualifiers ignored on function return type");
5498 type
= c_build_qualified_type (type
, type_quals
);
5500 type_quals
= TYPE_UNQUALIFIED
;
5502 type
= build_function_type (type
, arg_types
);
5503 declarator
= declarator
->declarator
;
5505 /* Set the TYPE_CONTEXTs for each tagged type which is local to
5506 the formal parameter list of this FUNCTION_TYPE to point to
5507 the FUNCTION_TYPE node itself. */
5511 for (link
= arg_info
->tags
;
5513 link
= TREE_CHAIN (link
))
5514 TYPE_CONTEXT (TREE_VALUE (link
)) = type
;
5520 /* Merge any constancy or volatility into the target type
5523 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
5525 pedwarn (loc
, OPT_pedantic
,
5526 "ISO C forbids qualified function types");
5528 type
= c_build_qualified_type (type
, type_quals
);
5529 size_varies
= false;
5531 /* When the pointed-to type involves components of variable size,
5532 care must be taken to ensure that the size evaluation code is
5533 emitted early enough to dominate all the possible later uses
5534 and late enough for the variables on which it depends to have
5537 This is expected to happen automatically when the pointed-to
5538 type has a name/declaration of it's own, but special attention
5539 is required if the type is anonymous.
5541 We handle the NORMAL and FIELD contexts here by attaching an
5542 artificial TYPE_DECL to such pointed-to type. This forces the
5543 sizes evaluation at a safe point and ensures it is not deferred
5544 until e.g. within a deeper conditional context.
5546 We expect nothing to be needed here for PARM or TYPENAME.
5547 Pushing a TYPE_DECL at this point for TYPENAME would actually
5548 be incorrect, as we might be in the middle of an expression
5549 with side effects on the pointed-to type size "arguments" prior
5550 to the pointer declaration point and the fake TYPE_DECL in the
5551 enclosing context would force the size evaluation prior to the
5554 if (!TYPE_NAME (type
)
5555 && (decl_context
== NORMAL
|| decl_context
== FIELD
)
5556 && variably_modified_type_p (type
, NULL_TREE
))
5558 tree decl
= build_decl (loc
, TYPE_DECL
, NULL_TREE
, type
);
5559 DECL_ARTIFICIAL (decl
) = 1;
5561 finish_decl (decl
, loc
, NULL_TREE
, NULL_TREE
, NULL_TREE
);
5562 TYPE_NAME (type
) = decl
;
5565 type
= build_pointer_type (type
);
5567 /* Process type qualifiers (such as const or volatile)
5568 that were given inside the `*'. */
5569 type_quals
= declarator
->u
.pointer_quals
;
5571 declarator
= declarator
->declarator
;
5578 *decl_attrs
= chainon (returned_attrs
, *decl_attrs
);
5580 /* Now TYPE has the actual type, apart from any qualifiers in
5583 /* Warn about address space used for things other than static memory or
5585 address_space
= DECODE_QUAL_ADDR_SPACE (type_quals
);
5586 if (!ADDR_SPACE_GENERIC_P (address_space
))
5588 if (decl_context
== NORMAL
)
5590 switch (storage_class
)
5593 error ("%qs combined with %<auto%> qualifier for %qE",
5594 c_addr_space_name (address_space
), name
);
5597 error ("%qs combined with %<register%> qualifier for %qE",
5598 c_addr_space_name (address_space
), name
);
5601 if (current_function_scope
)
5603 error ("%qs specified for auto variable %qE",
5604 c_addr_space_name (address_space
), name
);
5616 else if (decl_context
== PARM
&& TREE_CODE (type
) != ARRAY_TYPE
)
5619 error ("%qs specified for parameter %qE",
5620 c_addr_space_name (address_space
), name
);
5622 error ("%qs specified for unnamed parameter",
5623 c_addr_space_name (address_space
));
5625 else if (decl_context
== FIELD
)
5628 error ("%qs specified for structure field %qE",
5629 c_addr_space_name (address_space
), name
);
5631 error ("%qs specified for structure field",
5632 c_addr_space_name (address_space
));
5636 /* Check the type and width of a bit-field. */
5638 check_bitfield_type_and_width (&type
, width
, name
);
5640 /* Did array size calculations overflow? */
5642 if (TREE_CODE (type
) == ARRAY_TYPE
5643 && COMPLETE_TYPE_P (type
)
5644 && TREE_CODE (TYPE_SIZE_UNIT (type
)) == INTEGER_CST
5645 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type
)))
5648 error_at (loc
, "size of array %qE is too large", name
);
5650 error_at (loc
, "size of unnamed array is too large");
5651 /* If we proceed with the array type as it is, we'll eventually
5652 crash in tree_low_cst(). */
5653 type
= error_mark_node
;
5656 /* If this is declaring a typedef name, return a TYPE_DECL. */
5658 if (storage_class
== csc_typedef
)
5661 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
5663 pedwarn (loc
, OPT_pedantic
,
5664 "ISO C forbids qualified function types");
5666 type
= c_build_qualified_type (type
, type_quals
);
5667 decl
= build_decl (declarator
->id_loc
,
5668 TYPE_DECL
, declarator
->u
.id
, type
);
5669 if (declspecs
->explicit_signed_p
)
5670 C_TYPEDEF_EXPLICITLY_SIGNED (decl
) = 1;
5671 if (declspecs
->inline_p
)
5672 pedwarn (loc
, 0,"typedef %q+D declared %<inline%>", decl
);
5674 if (warn_cxx_compat
&& declarator
->u
.id
!= NULL_TREE
)
5676 struct c_binding
*b
= I_TAG_BINDING (declarator
->u
.id
);
5679 && b
->decl
!= NULL_TREE
5680 && (B_IN_CURRENT_SCOPE (b
)
5681 || (current_scope
== file_scope
&& B_IN_EXTERNAL_SCOPE (b
)))
5682 && TYPE_MAIN_VARIANT (b
->decl
) != TYPE_MAIN_VARIANT (type
))
5684 warning_at (declarator
->id_loc
, OPT_Wc___compat
,
5685 ("using %qD as both a typedef and a tag is "
5688 if (b
->locus
!= UNKNOWN_LOCATION
)
5689 inform (b
->locus
, "originally defined here");
5696 /* If this is a type name (such as, in a cast or sizeof),
5697 compute the type and return it now. */
5699 if (decl_context
== TYPENAME
)
5701 /* Note that the grammar rejects storage classes in typenames
5703 gcc_assert (storage_class
== csc_none
&& !threadp
5704 && !declspecs
->inline_p
);
5705 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
5707 pedwarn (loc
, OPT_pedantic
,
5708 "ISO C forbids const or volatile function types");
5710 type
= c_build_qualified_type (type
, type_quals
);
5714 if (pedantic
&& decl_context
== FIELD
5715 && variably_modified_type_p (type
, NULL_TREE
))
5718 pedwarn (loc
, OPT_pedantic
, "a member of a structure or union cannot "
5719 "have a variably modified type");
5722 /* Aside from typedefs and type names (handle above),
5723 `void' at top level (not within pointer)
5724 is allowed only in public variables.
5725 We don't complain about parms either, but that is because
5726 a better error message can be made later. */
5728 if (VOID_TYPE_P (type
) && decl_context
!= PARM
5729 && !((decl_context
!= FIELD
&& TREE_CODE (type
) != FUNCTION_TYPE
)
5730 && (storage_class
== csc_extern
5731 || (current_scope
== file_scope
5732 && !(storage_class
== csc_static
5733 || storage_class
== csc_register
)))))
5735 error_at (loc
, "variable or field %qE declared void", name
);
5736 type
= integer_type_node
;
5739 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
5740 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
5745 if (decl_context
== PARM
)
5749 /* A parameter declared as an array of T is really a pointer to T.
5750 One declared as a function is really a pointer to a function. */
5752 if (TREE_CODE (type
) == ARRAY_TYPE
)
5754 /* Transfer const-ness of array into that of type pointed to. */
5755 type
= TREE_TYPE (type
);
5757 type
= c_build_qualified_type (type
, type_quals
);
5758 type
= build_pointer_type (type
);
5759 type_quals
= array_ptr_quals
;
5761 type
= c_build_qualified_type (type
, type_quals
);
5763 /* We don't yet implement attributes in this context. */
5764 if (array_ptr_attrs
!= NULL_TREE
)
5765 warning_at (loc
, OPT_Wattributes
,
5766 "attributes in parameter array declarator ignored");
5768 size_varies
= false;
5770 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
5773 pedwarn (loc
, OPT_pedantic
,
5774 "ISO C forbids qualified function types");
5776 type
= c_build_qualified_type (type
, type_quals
);
5777 type
= build_pointer_type (type
);
5778 type_quals
= TYPE_UNQUALIFIED
;
5780 else if (type_quals
)
5781 type
= c_build_qualified_type (type
, type_quals
);
5783 decl
= build_decl (declarator
->id_loc
,
5784 PARM_DECL
, declarator
->u
.id
, type
);
5786 C_DECL_VARIABLE_SIZE (decl
) = 1;
5788 /* Compute the type actually passed in the parmlist,
5789 for the case where there is no prototype.
5790 (For example, shorts and chars are passed as ints.)
5791 When there is a prototype, this is overridden later. */
5793 if (type
== error_mark_node
)
5794 promoted_type
= type
;
5796 promoted_type
= c_type_promotes_to (type
);
5798 DECL_ARG_TYPE (decl
) = promoted_type
;
5799 if (declspecs
->inline_p
)
5800 pedwarn (loc
, 0, "parameter %q+D declared %<inline%>", decl
);
5802 else if (decl_context
== FIELD
)
5804 /* Note that the grammar rejects storage classes in typenames
5806 gcc_assert (storage_class
== csc_none
&& !threadp
5807 && !declspecs
->inline_p
);
5809 /* Structure field. It may not be a function. */
5811 if (TREE_CODE (type
) == FUNCTION_TYPE
)
5813 error_at (loc
, "field %qE declared as a function", name
);
5814 type
= build_pointer_type (type
);
5816 else if (TREE_CODE (type
) != ERROR_MARK
5817 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type
))
5820 error_at (loc
, "field %qE has incomplete type", name
);
5822 error_at (loc
, "unnamed field has incomplete type");
5823 type
= error_mark_node
;
5825 type
= c_build_qualified_type (type
, type_quals
);
5826 decl
= build_decl (declarator
->id_loc
,
5827 FIELD_DECL
, declarator
->u
.id
, type
);
5828 DECL_NONADDRESSABLE_P (decl
) = bitfield
;
5829 if (bitfield
&& !declarator
->u
.id
)
5830 TREE_NO_WARNING (decl
) = 1;
5833 C_DECL_VARIABLE_SIZE (decl
) = 1;
5835 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
5837 if (storage_class
== csc_register
|| threadp
)
5839 error_at (loc
, "invalid storage class for function %qE", name
);
5841 else if (current_scope
!= file_scope
)
5843 /* Function declaration not at file scope. Storage
5844 classes other than `extern' are not allowed, C99
5845 6.7.1p5, and `extern' makes no difference. However,
5846 GCC allows 'auto', perhaps with 'inline', to support
5847 nested functions. */
5848 if (storage_class
== csc_auto
)
5849 pedwarn (loc
, OPT_pedantic
,
5850 "invalid storage class for function %qE", name
);
5851 else if (storage_class
== csc_static
)
5853 error_at (loc
, "invalid storage class for function %qE", name
);
5855 storage_class
= declspecs
->storage_class
= csc_none
;
5861 decl
= build_decl (declarator
->id_loc
,
5862 FUNCTION_DECL
, declarator
->u
.id
, type
);
5863 decl
= build_decl_attribute_variant (decl
, decl_attr
);
5865 if (pedantic
&& type_quals
&& !DECL_IN_SYSTEM_HEADER (decl
))
5866 pedwarn (loc
, OPT_pedantic
,
5867 "ISO C forbids qualified function types");
5869 /* GNU C interprets a volatile-qualified function type to indicate
5870 that the function does not return. */
5871 if ((type_quals
& TYPE_QUAL_VOLATILE
)
5872 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl
))))
5873 warning_at (loc
, 0, "%<noreturn%> function returns non-void value");
5875 /* Every function declaration is an external reference
5876 (DECL_EXTERNAL) except for those which are not at file
5877 scope and are explicitly declared "auto". This is
5878 forbidden by standard C (C99 6.7.1p5) and is interpreted by
5879 GCC to signify a forward declaration of a nested function. */
5880 if (storage_class
== csc_auto
&& current_scope
!= file_scope
)
5881 DECL_EXTERNAL (decl
) = 0;
5882 /* In C99, a function which is declared 'inline' with 'extern'
5883 is not an external reference (which is confusing). It
5884 means that the later definition of the function must be output
5885 in this file, C99 6.7.4p6. In GNU C89, a function declared
5886 'extern inline' is an external reference. */
5887 else if (declspecs
->inline_p
&& storage_class
!= csc_static
)
5888 DECL_EXTERNAL (decl
) = ((storage_class
== csc_extern
)
5889 == flag_gnu89_inline
);
5891 DECL_EXTERNAL (decl
) = !initialized
;
5893 /* Record absence of global scope for `static' or `auto'. */
5895 = !(storage_class
== csc_static
|| storage_class
== csc_auto
);
5897 /* For a function definition, record the argument information
5898 block where store_parm_decls will look for it. */
5900 current_function_arg_info
= arg_info
;
5902 if (declspecs
->default_int_p
)
5903 C_FUNCTION_IMPLICIT_INT (decl
) = 1;
5905 /* Record presence of `inline', if it is reasonable. */
5906 if (flag_hosted
&& MAIN_NAME_P (declarator
->u
.id
))
5908 if (declspecs
->inline_p
)
5909 pedwarn (loc
, 0, "cannot inline function %<main%>");
5911 else if (declspecs
->inline_p
)
5912 /* Record that the function is declared `inline'. */
5913 DECL_DECLARED_INLINE_P (decl
) = 1;
5917 /* It's a variable. */
5918 /* An uninitialized decl with `extern' is a reference. */
5919 int extern_ref
= !initialized
&& storage_class
== csc_extern
;
5921 type
= c_build_qualified_type (type
, type_quals
);
5923 /* C99 6.2.2p7: It is invalid (compile-time undefined
5924 behavior) to create an 'extern' declaration for a
5925 variable if there is a global declaration that is
5926 'static' and the global declaration is not visible.
5927 (If the static declaration _is_ currently visible,
5928 the 'extern' declaration is taken to refer to that decl.) */
5929 if (extern_ref
&& current_scope
!= file_scope
)
5931 tree global_decl
= identifier_global_value (declarator
->u
.id
);
5932 tree visible_decl
= lookup_name (declarator
->u
.id
);
5935 && global_decl
!= visible_decl
5936 && TREE_CODE (global_decl
) == VAR_DECL
5937 && !TREE_PUBLIC (global_decl
))
5938 error_at (loc
, "variable previously declared %<static%> "
5939 "redeclared %<extern%>");
5942 decl
= build_decl (declarator
->id_loc
,
5943 VAR_DECL
, declarator
->u
.id
, type
);
5945 C_DECL_VARIABLE_SIZE (decl
) = 1;
5947 if (declspecs
->inline_p
)
5948 pedwarn (loc
, 0, "variable %q+D declared %<inline%>", decl
);
5950 /* At file scope, an initialized extern declaration may follow
5951 a static declaration. In that case, DECL_EXTERNAL will be
5952 reset later in start_decl. */
5953 DECL_EXTERNAL (decl
) = (storage_class
== csc_extern
);
5955 /* At file scope, the presence of a `static' or `register' storage
5956 class specifier, or the absence of all storage class specifiers
5957 makes this declaration a definition (perhaps tentative). Also,
5958 the absence of `static' makes it public. */
5959 if (current_scope
== file_scope
)
5961 TREE_PUBLIC (decl
) = storage_class
!= csc_static
;
5962 TREE_STATIC (decl
) = !extern_ref
;
5964 /* Not at file scope, only `static' makes a static definition. */
5967 TREE_STATIC (decl
) = (storage_class
== csc_static
);
5968 TREE_PUBLIC (decl
) = extern_ref
;
5972 DECL_TLS_MODEL (decl
) = decl_default_tls_model (decl
);
5975 if ((storage_class
== csc_extern
5976 || (storage_class
== csc_none
5977 && TREE_CODE (type
) == FUNCTION_TYPE
5979 && variably_modified_type_p (type
, NULL_TREE
))
5982 if (TREE_CODE (type
) == FUNCTION_TYPE
)
5983 error_at (loc
, "non-nested function with variably modified type");
5985 error_at (loc
, "object with variably modified type must have "
5989 /* Record `register' declaration for warnings on &
5990 and in case doing stupid register allocation. */
5992 if (storage_class
== csc_register
)
5994 C_DECL_REGISTER (decl
) = 1;
5995 DECL_REGISTER (decl
) = 1;
5998 /* Record constancy and volatility. */
5999 c_apply_type_quals_to_decl (type_quals
, decl
);
6001 /* If a type has volatile components, it should be stored in memory.
6002 Otherwise, the fact that those components are volatile
6003 will be ignored, and would even crash the compiler.
6004 Of course, this only makes sense on VAR,PARM, and RESULT decl's. */
6005 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl
))
6006 && (TREE_CODE (decl
) == VAR_DECL
|| TREE_CODE (decl
) == PARM_DECL
6007 || TREE_CODE (decl
) == RESULT_DECL
))
6009 /* It is not an error for a structure with volatile fields to
6010 be declared register, but reset DECL_REGISTER since it
6011 cannot actually go in a register. */
6012 int was_reg
= C_DECL_REGISTER (decl
);
6013 C_DECL_REGISTER (decl
) = 0;
6014 DECL_REGISTER (decl
) = 0;
6015 c_mark_addressable (decl
);
6016 C_DECL_REGISTER (decl
) = was_reg
;
6019 /* This is the earliest point at which we might know the assembler
6020 name of a variable. Thus, if it's known before this, die horribly. */
6021 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl
));
6024 && TREE_CODE (decl
) == VAR_DECL
6025 && TREE_PUBLIC (decl
)
6026 && TREE_STATIC (decl
)
6027 && (TREE_CODE (TREE_TYPE (decl
)) == RECORD_TYPE
6028 || TREE_CODE (TREE_TYPE (decl
)) == UNION_TYPE
6029 || TREE_CODE (TREE_TYPE (decl
)) == ENUMERAL_TYPE
)
6030 && TYPE_NAME (TREE_TYPE (decl
)) == NULL_TREE
)
6031 warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wc___compat
,
6032 ("non-local variable %qD with anonymous type is "
6033 "questionable in C++"),
6040 /* Decode the parameter-list info for a function type or function definition.
6041 The argument is the value returned by `get_parm_info' (or made in c-parse.c
6042 if there is an identifier list instead of a parameter decl list).
6043 These two functions are separate because when a function returns
6044 or receives functions then each is called multiple times but the order
6045 of calls is different. The last call to `grokparms' is always the one
6046 that contains the formal parameter names of a function definition.
6048 Return a list of arg types to use in the FUNCTION_TYPE for this function.
6050 FUNCDEF_FLAG is true for a function definition, false for
6051 a mere declaration. A nonempty identifier-list gets an error message
6052 when FUNCDEF_FLAG is false. */
6055 grokparms (struct c_arg_info
*arg_info
, bool funcdef_flag
)
6057 tree arg_types
= arg_info
->types
;
6059 if (funcdef_flag
&& arg_info
->had_vla_unspec
)
6061 /* A function definition isn't function prototype scope C99 6.2.1p4. */
6063 error ("%<[*]%> not allowed in other than function prototype scope");
6066 if (arg_types
== 0 && !funcdef_flag
&& !in_system_header
)
6067 warning (OPT_Wstrict_prototypes
,
6068 "function declaration isn%'t a prototype");
6070 if (arg_types
== error_mark_node
)
6071 return 0; /* don't set TYPE_ARG_TYPES in this case */
6073 else if (arg_types
&& TREE_CODE (TREE_VALUE (arg_types
)) == IDENTIFIER_NODE
)
6076 pedwarn (input_location
, 0, "parameter names (without types) in function declaration");
6078 arg_info
->parms
= arg_info
->types
;
6079 arg_info
->types
= 0;
6084 tree parm
, type
, typelt
;
6085 unsigned int parmno
;
6088 /* If there is a parameter of incomplete type in a definition,
6089 this is an error. In a declaration this is valid, and a
6090 struct or union type may be completed later, before any calls
6091 or definition of the function. In the case where the tag was
6092 first declared within the parameter list, a warning has
6093 already been given. If a parameter has void type, then
6094 however the function cannot be defined or called, so
6097 for (parm
= arg_info
->parms
, typelt
= arg_types
, parmno
= 1;
6099 parm
= TREE_CHAIN (parm
), typelt
= TREE_CHAIN (typelt
), parmno
++)
6101 type
= TREE_VALUE (typelt
);
6102 if (type
== error_mark_node
)
6105 if (!COMPLETE_TYPE_P (type
))
6109 if (DECL_NAME (parm
))
6110 error_at (input_location
,
6111 "parameter %u (%q+D) has incomplete type",
6114 error_at (DECL_SOURCE_LOCATION (parm
),
6115 "parameter %u has incomplete type",
6118 TREE_VALUE (typelt
) = error_mark_node
;
6119 TREE_TYPE (parm
) = error_mark_node
;
6121 else if (VOID_TYPE_P (type
))
6123 if (DECL_NAME (parm
))
6124 warning_at (input_location
, 0,
6125 "parameter %u (%q+D) has void type",
6128 warning_at (DECL_SOURCE_LOCATION (parm
), 0,
6129 "parameter %u has void type",
6134 errmsg
= targetm
.invalid_parameter_type (type
);
6138 TREE_VALUE (typelt
) = error_mark_node
;
6139 TREE_TYPE (parm
) = error_mark_node
;
6142 if (DECL_NAME (parm
) && TREE_USED (parm
))
6143 warn_if_shadowing (parm
);
6149 /* Take apart the current scope and return a c_arg_info structure with
6150 info on a parameter list just parsed.
6152 This structure is later fed to 'grokparms' and 'store_parm_decls'.
6154 ELLIPSIS being true means the argument list ended in '...' so don't
6155 append a sentinel (void_list_node) to the end of the type-list. */
6158 get_parm_info (bool ellipsis
)
6160 struct c_binding
*b
= current_scope
->bindings
;
6161 struct c_arg_info
*arg_info
= XOBNEW (&parser_obstack
,
6168 static bool explained_incomplete_types
= false;
6169 bool gave_void_only_once_err
= false;
6171 arg_info
->parms
= 0;
6173 arg_info
->types
= 0;
6174 arg_info
->others
= 0;
6175 arg_info
->pending_sizes
= 0;
6176 arg_info
->had_vla_unspec
= current_scope
->had_vla_unspec
;
6178 /* The bindings in this scope must not get put into a block.
6179 We will take care of deleting the binding nodes. */
6180 current_scope
->bindings
= 0;
6182 /* This function is only called if there was *something* on the
6186 /* A parameter list consisting solely of 'void' indicates that the
6187 function takes no arguments. But if the 'void' is qualified
6188 (by 'const' or 'volatile'), or has a storage class specifier
6189 ('register'), then the behavior is undefined; issue an error.
6190 Typedefs for 'void' are OK (see DR#157). */
6191 if (b
->prev
== 0 /* one binding */
6192 && TREE_CODE (b
->decl
) == PARM_DECL
/* which is a parameter */
6193 && !DECL_NAME (b
->decl
) /* anonymous */
6194 && VOID_TYPE_P (TREE_TYPE (b
->decl
))) /* of void type */
6196 if (TREE_THIS_VOLATILE (b
->decl
)
6197 || TREE_READONLY (b
->decl
)
6198 || C_DECL_REGISTER (b
->decl
))
6199 error ("%<void%> as only parameter may not be qualified");
6201 /* There cannot be an ellipsis. */
6203 error ("%<void%> must be the only parameter");
6205 arg_info
->types
= void_list_node
;
6210 types
= void_list_node
;
6212 /* Break up the bindings list into parms, tags, types, and others;
6213 apply sanity checks; purge the name-to-decl bindings. */
6216 tree decl
= b
->decl
;
6217 tree type
= TREE_TYPE (decl
);
6218 const char *keyword
;
6220 switch (TREE_CODE (decl
))
6225 gcc_assert (I_SYMBOL_BINDING (b
->id
) == b
);
6226 I_SYMBOL_BINDING (b
->id
) = b
->shadowed
;
6229 /* Check for forward decls that never got their actual decl. */
6230 if (TREE_ASM_WRITTEN (decl
))
6231 error ("parameter %q+D has just a forward declaration", decl
);
6232 /* Check for (..., void, ...) and issue an error. */
6233 else if (VOID_TYPE_P (type
) && !DECL_NAME (decl
))
6235 if (!gave_void_only_once_err
)
6237 error ("%<void%> must be the only parameter");
6238 gave_void_only_once_err
= true;
6243 /* Valid parameter, add it to the list. */
6244 TREE_CHAIN (decl
) = parms
;
6247 /* Since there is a prototype, args are passed in their
6248 declared types. The back end may override this later. */
6249 DECL_ARG_TYPE (decl
) = type
;
6250 types
= tree_cons (0, type
, types
);
6254 case ENUMERAL_TYPE
: keyword
= "enum"; goto tag
;
6255 case UNION_TYPE
: keyword
= "union"; goto tag
;
6256 case RECORD_TYPE
: keyword
= "struct"; goto tag
;
6258 /* Types may not have tag-names, in which case the type
6259 appears in the bindings list with b->id NULL. */
6262 gcc_assert (I_TAG_BINDING (b
->id
) == b
);
6263 I_TAG_BINDING (b
->id
) = b
->shadowed
;
6266 /* Warn about any struct, union or enum tags defined in a
6267 parameter list. The scope of such types is limited to
6268 the parameter list, which is rarely if ever desirable
6269 (it's impossible to call such a function with type-
6270 correct arguments). An anonymous union parm type is
6271 meaningful as a GNU extension, so don't warn for that. */
6272 if (TREE_CODE (decl
) != UNION_TYPE
|| b
->id
!= 0)
6275 /* The %s will be one of 'struct', 'union', or 'enum'. */
6276 warning (0, "%<%s %E%> declared inside parameter list",
6279 /* The %s will be one of 'struct', 'union', or 'enum'. */
6280 warning (0, "anonymous %s declared inside parameter list",
6283 if (!explained_incomplete_types
)
6285 warning (0, "its scope is only this definition or declaration,"
6286 " which is probably not what you want");
6287 explained_incomplete_types
= true;
6291 tags
= tree_cons (b
->id
, decl
, tags
);
6297 /* CONST_DECLs appear here when we have an embedded enum,
6298 and TYPE_DECLs appear here when we have an embedded struct
6299 or union. No warnings for this - we already warned about the
6300 type itself. FUNCTION_DECLs appear when there is an implicit
6301 function declaration in the parameter list. */
6303 TREE_CHAIN (decl
) = others
;
6308 /* error_mark_node appears here when we have an undeclared
6309 variable. Just throw it away. */
6312 gcc_assert (I_SYMBOL_BINDING (b
->id
) == b
);
6313 I_SYMBOL_BINDING (b
->id
) = b
->shadowed
;
6317 /* Other things that might be encountered. */
6324 b
= free_binding_and_advance (b
);
6327 arg_info
->parms
= parms
;
6328 arg_info
->tags
= tags
;
6329 arg_info
->types
= types
;
6330 arg_info
->others
= others
;
6331 arg_info
->pending_sizes
= get_pending_sizes ();
6335 /* Get the struct, enum or union (CODE says which) with tag NAME.
6336 Define the tag as a forward-reference with location LOC if it is
6337 not defined. Return a c_typespec structure for the type
6341 parser_xref_tag (location_t loc
, enum tree_code code
, tree name
)
6343 struct c_typespec ret
;
6347 ret
.expr
= NULL_TREE
;
6348 ret
.expr_const_operands
= true;
6350 /* If a cross reference is requested, look up the type
6351 already defined for this tag and return it. */
6353 ref
= lookup_tag (code
, name
, 0, &refloc
);
6354 /* If this is the right type of tag, return what we found.
6355 (This reference will be shadowed by shadow_tag later if appropriate.)
6356 If this is the wrong type of tag, do not return it. If it was the
6357 wrong type in the same scope, we will have had an error
6358 message already; if in a different scope and declaring
6359 a name, pending_xref_error will give an error message; but if in a
6360 different scope and not declaring a name, this tag should
6361 shadow the previous declaration of a different type of tag, and
6362 this would not work properly if we return the reference found.
6363 (For example, with "struct foo" in an outer scope, "union foo;"
6364 must shadow that tag with a new one of union type.) */
6365 ret
.kind
= (ref
? ctsk_tagref
: ctsk_tagfirstref
);
6366 if (ref
&& TREE_CODE (ref
) == code
)
6368 if (C_TYPE_DEFINED_IN_STRUCT (ref
)
6369 && loc
!= UNKNOWN_LOCATION
6375 warning_at (loc
, OPT_Wc___compat
,
6376 ("enum type defined in struct or union "
6377 "is not visible in C++"));
6378 inform (refloc
, "enum type defined here");
6381 warning_at (loc
, OPT_Wc___compat
,
6382 ("struct defined in struct or union "
6383 "is not visible in C++"));
6384 inform (refloc
, "struct defined here");
6387 warning_at (loc
, OPT_Wc___compat
,
6388 ("union defined in struct or union "
6389 "is not visible in C++"));
6390 inform (refloc
, "union defined here");
6401 /* If no such tag is yet defined, create a forward-reference node
6402 and record it as the "definition".
6403 When a real declaration of this type is found,
6404 the forward-reference will be altered into a real type. */
6406 ref
= make_node (code
);
6407 if (code
== ENUMERAL_TYPE
)
6409 /* Give the type a default layout like unsigned int
6410 to avoid crashing if it does not get defined. */
6411 SET_TYPE_MODE (ref
, TYPE_MODE (unsigned_type_node
));
6412 TYPE_ALIGN (ref
) = TYPE_ALIGN (unsigned_type_node
);
6413 TYPE_USER_ALIGN (ref
) = 0;
6414 TYPE_UNSIGNED (ref
) = 1;
6415 TYPE_PRECISION (ref
) = TYPE_PRECISION (unsigned_type_node
);
6416 TYPE_MIN_VALUE (ref
) = TYPE_MIN_VALUE (unsigned_type_node
);
6417 TYPE_MAX_VALUE (ref
) = TYPE_MAX_VALUE (unsigned_type_node
);
6420 pushtag (loc
, name
, ref
);
6426 /* Get the struct, enum or union (CODE says which) with tag NAME.
6427 Define the tag as a forward-reference if it is not defined.
6428 Return a tree for the type. */
6431 xref_tag (enum tree_code code
, tree name
)
6433 return parser_xref_tag (input_location
, code
, name
).spec
;
6436 /* Make sure that the tag NAME is defined *in the current scope*
6437 at least as a forward reference.
6438 LOC is the location of the struct's definition.
6439 CODE says which kind of tag NAME ought to be.
6441 This stores the current value of the file static STRUCT_PARSE_INFO
6442 in *ENCLOSING_STRUCT_PARSE_INFO, and points STRUCT_PARSE_INFO at a
6443 new c_struct_parse_info structure. The old value of
6444 STRUCT_PARSE_INFO is restored in finish_struct. */
6447 start_struct (location_t loc
, enum tree_code code
, tree name
,
6448 struct c_struct_parse_info
**enclosing_struct_parse_info
)
6450 /* If there is already a tag defined at this scope
6451 (as a forward reference), just return it. */
6453 tree ref
= NULL_TREE
;
6454 location_t refloc
= UNKNOWN_LOCATION
;
6456 if (name
!= NULL_TREE
)
6457 ref
= lookup_tag (code
, name
, 1, &refloc
);
6458 if (ref
&& TREE_CODE (ref
) == code
)
6460 if (TYPE_SIZE (ref
))
6462 if (code
== UNION_TYPE
)
6463 error_at (loc
, "redefinition of %<union %E%>", name
);
6465 error_at (loc
, "redefinition of %<struct %E%>", name
);
6466 if (refloc
!= UNKNOWN_LOCATION
)
6467 inform (refloc
, "originally defined here");
6468 /* Don't create structures using a name already in use. */
6471 else if (C_TYPE_BEING_DEFINED (ref
))
6473 if (code
== UNION_TYPE
)
6474 error_at (loc
, "nested redefinition of %<union %E%>", name
);
6476 error_at (loc
, "nested redefinition of %<struct %E%>", name
);
6477 /* Don't bother to report "originally defined here" for a
6478 nested redefinition; the original definition should be
6480 /* Don't create structures that contain themselves. */
6485 /* Otherwise create a forward-reference just so the tag is in scope. */
6487 if (ref
== NULL_TREE
|| TREE_CODE (ref
) != code
)
6489 ref
= make_node (code
);
6490 pushtag (loc
, name
, ref
);
6493 C_TYPE_BEING_DEFINED (ref
) = 1;
6494 TYPE_PACKED (ref
) = flag_pack_struct
;
6496 *enclosing_struct_parse_info
= struct_parse_info
;
6497 struct_parse_info
= XNEW (struct c_struct_parse_info
);
6498 struct_parse_info
->struct_types
= VEC_alloc (tree
, heap
, 0);
6499 struct_parse_info
->fields
= VEC_alloc (c_binding_ptr
, heap
, 0);
6500 struct_parse_info
->typedefs_seen
= VEC_alloc (tree
, heap
, 0);
6502 /* FIXME: This will issue a warning for a use of a type defined
6503 within a statement expr used within sizeof, et. al. This is not
6504 terribly serious as C++ doesn't permit statement exprs within
6506 if (warn_cxx_compat
&& (in_sizeof
|| in_typeof
|| in_alignof
))
6507 warning_at (loc
, OPT_Wc___compat
,
6508 "defining type in %qs expression is invalid in C++",
6511 : (in_typeof
? "typeof" : "alignof")));
6516 /* Process the specs, declarator and width (NULL if omitted)
6517 of a structure component, returning a FIELD_DECL node.
6518 WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node.
6519 DECL_ATTRS is as for grokdeclarator.
6521 LOC is the location of the structure component.
6523 This is done during the parsing of the struct declaration.
6524 The FIELD_DECL nodes are chained together and the lot of them
6525 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
6528 grokfield (location_t loc
,
6529 struct c_declarator
*declarator
, struct c_declspecs
*declspecs
,
6530 tree width
, tree
*decl_attrs
)
6534 if (declarator
->kind
== cdk_id
&& declarator
->u
.id
== NULL_TREE
6535 && width
== NULL_TREE
)
6537 /* This is an unnamed decl.
6539 If we have something of the form "union { list } ;" then this
6540 is the anonymous union extension. Similarly for struct.
6542 If this is something of the form "struct foo;", then
6543 If MS extensions are enabled, this is handled as an
6545 Otherwise this is a forward declaration of a structure tag.
6547 If this is something of the form "foo;" and foo is a TYPE_DECL, then
6548 If MS extensions are enabled and foo names a structure, then
6549 again this is an anonymous struct.
6550 Otherwise this is an error.
6552 Oh what a horrid tangled web we weave. I wonder if MS consciously
6553 took this from Plan 9 or if it was an accident of implementation
6554 that took root before someone noticed the bug... */
6556 tree type
= declspecs
->type
;
6557 bool type_ok
= (TREE_CODE (type
) == RECORD_TYPE
6558 || TREE_CODE (type
) == UNION_TYPE
);
6562 && (flag_ms_extensions
|| !declspecs
->typedef_p
))
6564 if (flag_ms_extensions
)
6568 else if (TYPE_NAME (type
) == NULL
)
6575 pedwarn (loc
, 0, "declaration does not declare anything");
6578 pedwarn (loc
, OPT_pedantic
, "ISO C doesn%'t support unnamed structs/unions");
6581 value
= grokdeclarator (declarator
, declspecs
, FIELD
, false,
6582 width
? &width
: NULL
, decl_attrs
, NULL
, NULL
,
6585 finish_decl (value
, loc
, NULL_TREE
, NULL_TREE
, NULL_TREE
);
6586 DECL_INITIAL (value
) = width
;
6588 if (warn_cxx_compat
&& DECL_NAME (value
) != NULL_TREE
)
6590 /* If we currently have a binding for this field, set the
6591 in_struct field in the binding, so that we warn about lookups
6593 struct c_binding
*b
= I_SYMBOL_BINDING (DECL_NAME (value
));
6596 /* If the in_struct field is not yet set, push it on a list
6597 to be cleared when this struct is finished. */
6600 VEC_safe_push (c_binding_ptr
, heap
,
6601 struct_parse_info
->fields
, b
);
6610 /* Generate an error for any duplicate field names in FIELDLIST. Munge
6611 the list such that this does not present a problem later. */
6614 detect_field_duplicates (tree fieldlist
)
6619 /* First, see if there are more than "a few" fields.
6620 This is trivially true if there are zero or one fields. */
6623 x
= TREE_CHAIN (fieldlist
);
6629 } while (timeout
> 0 && x
);
6631 /* If there were "few" fields, avoid the overhead of allocating
6632 a hash table. Instead just do the nested traversal thing. */
6635 for (x
= TREE_CHAIN (fieldlist
); x
; x
= TREE_CHAIN (x
))
6638 for (y
= fieldlist
; y
!= x
; y
= TREE_CHAIN (y
))
6639 if (DECL_NAME (y
) == DECL_NAME (x
))
6641 error ("duplicate member %q+D", x
);
6642 DECL_NAME (x
) = NULL_TREE
;
6648 htab_t htab
= htab_create (37, htab_hash_pointer
, htab_eq_pointer
, NULL
);
6651 for (x
= fieldlist
; x
; x
= TREE_CHAIN (x
))
6652 if ((y
= DECL_NAME (x
)) != 0)
6654 slot
= htab_find_slot (htab
, y
, INSERT
);
6657 error ("duplicate member %q+D", x
);
6658 DECL_NAME (x
) = NULL_TREE
;
6667 /* Finish up struct info used by -Wc++-compat. */
6670 warn_cxx_compat_finish_struct (tree fieldlist
)
6674 struct c_binding
*b
;
6676 /* Set the C_TYPE_DEFINED_IN_STRUCT flag for each type defined in
6677 the current struct. We do this now at the end of the struct
6678 because the flag is used to issue visibility warnings, and we
6679 only want to issue those warnings if the type is referenced
6680 outside of the struct declaration. */
6681 for (ix
= 0; VEC_iterate (tree
, struct_parse_info
->struct_types
, ix
, x
); ++ix
)
6682 C_TYPE_DEFINED_IN_STRUCT (x
) = 1;
6684 /* The TYPEDEFS_SEEN field of STRUCT_PARSE_INFO is a list of
6685 typedefs used when declaring fields in this struct. If the name
6686 of any of the fields is also a typedef name then the struct would
6687 not parse in C++, because the C++ lookup rules say that the
6688 typedef name would be looked up in the context of the struct, and
6689 would thus be the field rather than the typedef. */
6690 if (!VEC_empty (tree
, struct_parse_info
->typedefs_seen
)
6691 && fieldlist
!= NULL_TREE
)
6693 /* Use a pointer_set using the name of the typedef. We can use
6694 a pointer_set because identifiers are interned. */
6695 struct pointer_set_t
*tset
= pointer_set_create ();
6698 VEC_iterate (tree
, struct_parse_info
->typedefs_seen
, ix
, x
);
6700 pointer_set_insert (tset
, DECL_NAME (x
));
6702 for (x
= fieldlist
; x
!= NULL_TREE
; x
= TREE_CHAIN (x
))
6704 if (pointer_set_contains (tset
, DECL_NAME (x
)))
6706 warning_at (DECL_SOURCE_LOCATION (x
), OPT_Wc___compat
,
6707 ("using %qD as both field and typedef name is "
6710 /* FIXME: It would be nice to report the location where
6711 the typedef name is used. */
6715 pointer_set_destroy (tset
);
6718 /* For each field which has a binding and which was not defined in
6719 an enclosing struct, clear the in_struct field. */
6721 VEC_iterate (c_binding_ptr
, struct_parse_info
->fields
, ix
, b
);
6726 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
6727 LOC is the location of the RECORD_TYPE or UNION_TYPE's definition.
6728 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
6729 ATTRIBUTES are attributes to be applied to the structure.
6731 ENCLOSING_STRUCT_PARSE_INFO is the value of STRUCT_PARSE_INFO when
6732 the struct was started. */
6735 finish_struct (location_t loc
, tree t
, tree fieldlist
, tree attributes
,
6736 struct c_struct_parse_info
*enclosing_struct_parse_info
)
6739 bool toplevel
= file_scope
== current_scope
;
6740 int saw_named_field
;
6742 /* If this type was previously laid out as a forward reference,
6743 make sure we lay it out again. */
6747 decl_attributes (&t
, attributes
, (int) ATTR_FLAG_TYPE_IN_PLACE
);
6751 for (x
= fieldlist
; x
; x
= TREE_CHAIN (x
))
6752 if (DECL_NAME (x
) != 0)
6757 if (TREE_CODE (t
) == UNION_TYPE
)
6760 pedwarn (loc
, OPT_pedantic
, "union has no named members");
6762 pedwarn (loc
, OPT_pedantic
, "union has no members");
6767 pedwarn (loc
, OPT_pedantic
, "struct has no named members");
6769 pedwarn (loc
, OPT_pedantic
, "struct has no members");
6774 /* Install struct as DECL_CONTEXT of each field decl.
6775 Also process specified field sizes, found in the DECL_INITIAL,
6776 storing 0 there after the type has been changed to precision equal
6777 to its width, rather than the precision of the specified standard
6778 type. (Correct layout requires the original type to have been preserved
6781 saw_named_field
= 0;
6782 for (x
= fieldlist
; x
; x
= TREE_CHAIN (x
))
6784 if (TREE_TYPE (x
) == error_mark_node
)
6787 DECL_CONTEXT (x
) = t
;
6789 /* If any field is const, the structure type is pseudo-const. */
6790 if (TREE_READONLY (x
))
6791 C_TYPE_FIELDS_READONLY (t
) = 1;
6794 /* A field that is pseudo-const makes the structure likewise. */
6795 tree t1
= TREE_TYPE (x
);
6796 while (TREE_CODE (t1
) == ARRAY_TYPE
)
6797 t1
= TREE_TYPE (t1
);
6798 if ((TREE_CODE (t1
) == RECORD_TYPE
|| TREE_CODE (t1
) == UNION_TYPE
)
6799 && C_TYPE_FIELDS_READONLY (t1
))
6800 C_TYPE_FIELDS_READONLY (t
) = 1;
6803 /* Any field that is volatile means variables of this type must be
6804 treated in some ways as volatile. */
6805 if (TREE_THIS_VOLATILE (x
))
6806 C_TYPE_FIELDS_VOLATILE (t
) = 1;
6808 /* Any field of nominal variable size implies structure is too. */
6809 if (C_DECL_VARIABLE_SIZE (x
))
6810 C_TYPE_VARIABLE_SIZE (t
) = 1;
6812 if (DECL_INITIAL (x
))
6814 unsigned HOST_WIDE_INT width
= tree_low_cst (DECL_INITIAL (x
), 1);
6815 DECL_SIZE (x
) = bitsize_int (width
);
6816 DECL_BIT_FIELD (x
) = 1;
6817 SET_DECL_C_BIT_FIELD (x
);
6821 && (DECL_BIT_FIELD (x
)
6822 || TYPE_ALIGN (TREE_TYPE (x
)) > BITS_PER_UNIT
))
6823 DECL_PACKED (x
) = 1;
6825 /* Detect flexible array member in an invalid context. */
6826 if (TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
6827 && TYPE_SIZE (TREE_TYPE (x
)) == NULL_TREE
6828 && TYPE_DOMAIN (TREE_TYPE (x
)) != NULL_TREE
6829 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x
))) == NULL_TREE
)
6831 if (TREE_CODE (t
) == UNION_TYPE
)
6833 error_at (DECL_SOURCE_LOCATION (x
),
6834 "flexible array member in union");
6835 TREE_TYPE (x
) = error_mark_node
;
6837 else if (TREE_CHAIN (x
) != NULL_TREE
)
6839 error_at (DECL_SOURCE_LOCATION (x
),
6840 "flexible array member not at end of struct");
6841 TREE_TYPE (x
) = error_mark_node
;
6843 else if (!saw_named_field
)
6845 error_at (DECL_SOURCE_LOCATION (x
),
6846 "flexible array member in otherwise empty struct");
6847 TREE_TYPE (x
) = error_mark_node
;
6851 if (pedantic
&& TREE_CODE (t
) == RECORD_TYPE
6852 && flexible_array_type_p (TREE_TYPE (x
)))
6853 pedwarn (DECL_SOURCE_LOCATION (x
), OPT_pedantic
,
6854 "invalid use of structure with flexible array member");
6857 saw_named_field
= 1;
6860 detect_field_duplicates (fieldlist
);
6862 /* Now we have the nearly final fieldlist. Record it,
6863 then lay out the structure or union (including the fields). */
6865 TYPE_FIELDS (t
) = fieldlist
;
6869 /* Give bit-fields their proper types. */
6871 tree
*fieldlistp
= &fieldlist
;
6873 if (TREE_CODE (*fieldlistp
) == FIELD_DECL
&& DECL_INITIAL (*fieldlistp
)
6874 && TREE_TYPE (*fieldlistp
) != error_mark_node
)
6876 unsigned HOST_WIDE_INT width
6877 = tree_low_cst (DECL_INITIAL (*fieldlistp
), 1);
6878 tree type
= TREE_TYPE (*fieldlistp
);
6879 if (width
!= TYPE_PRECISION (type
))
6881 TREE_TYPE (*fieldlistp
)
6882 = c_build_bitfield_integer_type (width
, TYPE_UNSIGNED (type
));
6883 DECL_MODE (*fieldlistp
) = TYPE_MODE (TREE_TYPE (*fieldlistp
));
6885 DECL_INITIAL (*fieldlistp
) = 0;
6888 fieldlistp
= &TREE_CHAIN (*fieldlistp
);
6891 /* Now we have the truly final field list.
6892 Store it in this type and in the variants. */
6894 TYPE_FIELDS (t
) = fieldlist
;
6896 /* If there are lots of fields, sort so we can look through them fast.
6897 We arbitrarily consider 16 or more elts to be "a lot". */
6902 for (x
= fieldlist
; x
; x
= TREE_CHAIN (x
))
6904 if (len
> 15 || DECL_NAME (x
) == NULL
)
6912 struct lang_type
*space
;
6913 struct sorted_fields_type
*space2
;
6915 len
+= list_length (x
);
6917 /* Use the same allocation policy here that make_node uses, to
6918 ensure that this lives as long as the rest of the struct decl.
6919 All decls in an inline function need to be saved. */
6921 space
= GGC_CNEW (struct lang_type
);
6922 space2
= GGC_NEWVAR (struct sorted_fields_type
,
6923 sizeof (struct sorted_fields_type
) + len
* sizeof (tree
));
6927 field_array
= &space2
->elts
[0];
6928 for (x
= fieldlist
; x
; x
= TREE_CHAIN (x
))
6930 field_array
[len
++] = x
;
6932 /* If there is anonymous struct or union, break out of the loop. */
6933 if (DECL_NAME (x
) == NULL
)
6936 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
6939 TYPE_LANG_SPECIFIC (t
) = space
;
6940 TYPE_LANG_SPECIFIC (t
)->s
->len
= len
;
6941 field_array
= TYPE_LANG_SPECIFIC (t
)->s
->elts
;
6942 qsort (field_array
, len
, sizeof (tree
), field_decl_cmp
);
6947 for (x
= TYPE_MAIN_VARIANT (t
); x
; x
= TYPE_NEXT_VARIANT (x
))
6949 TYPE_FIELDS (x
) = TYPE_FIELDS (t
);
6950 TYPE_LANG_SPECIFIC (x
) = TYPE_LANG_SPECIFIC (t
);
6951 C_TYPE_FIELDS_READONLY (x
) = C_TYPE_FIELDS_READONLY (t
);
6952 C_TYPE_FIELDS_VOLATILE (x
) = C_TYPE_FIELDS_VOLATILE (t
);
6953 C_TYPE_VARIABLE_SIZE (x
) = C_TYPE_VARIABLE_SIZE (t
);
6956 /* If this was supposed to be a transparent union, but we can't
6957 make it one, warn and turn off the flag. */
6958 if (TREE_CODE (t
) == UNION_TYPE
6959 && TYPE_TRANSPARENT_AGGR (t
)
6960 && (!TYPE_FIELDS (t
) || TYPE_MODE (t
) != DECL_MODE (TYPE_FIELDS (t
))))
6962 TYPE_TRANSPARENT_AGGR (t
) = 0;
6963 warning_at (loc
, 0, "union cannot be made transparent");
6966 /* If this structure or union completes the type of any previous
6967 variable declaration, lay it out and output its rtl. */
6968 for (x
= C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t
));
6972 tree decl
= TREE_VALUE (x
);
6973 if (TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
)
6974 layout_array_type (TREE_TYPE (decl
));
6975 if (TREE_CODE (decl
) != TYPE_DECL
)
6977 layout_decl (decl
, 0);
6978 if (c_dialect_objc ())
6979 objc_check_decl (decl
);
6980 rest_of_decl_compilation (decl
, toplevel
, 0);
6985 C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t
)) = 0;
6987 /* Update type location to the one of the definition, instead of e.g.
6988 a forward declaration. */
6989 if (TYPE_STUB_DECL (t
))
6990 DECL_SOURCE_LOCATION (TYPE_STUB_DECL (t
)) = loc
;
6992 /* Finish debugging output for this type. */
6993 rest_of_type_compilation (t
, toplevel
);
6995 /* If we're inside a function proper, i.e. not file-scope and not still
6996 parsing parameters, then arrange for the size of a variable sized type
6998 if (cur_stmt_list
&& variably_modified_type_p (t
, NULL_TREE
))
6999 add_stmt (build_stmt (loc
,
7000 DECL_EXPR
, build_decl (loc
, TYPE_DECL
, NULL
, t
)));
7002 if (warn_cxx_compat
)
7003 warn_cxx_compat_finish_struct (fieldlist
);
7005 VEC_free (tree
, heap
, struct_parse_info
->struct_types
);
7006 VEC_free (c_binding_ptr
, heap
, struct_parse_info
->fields
);
7007 VEC_free (tree
, heap
, struct_parse_info
->typedefs_seen
);
7008 XDELETE (struct_parse_info
);
7010 struct_parse_info
= enclosing_struct_parse_info
;
7012 /* If this struct is defined inside a struct, add it to
7015 && struct_parse_info
!= NULL
7016 && !in_sizeof
&& !in_typeof
&& !in_alignof
)
7017 VEC_safe_push (tree
, heap
, struct_parse_info
->struct_types
, t
);
7022 /* Lay out the type T, and its element type, and so on. */
7025 layout_array_type (tree t
)
7027 if (TREE_CODE (TREE_TYPE (t
)) == ARRAY_TYPE
)
7028 layout_array_type (TREE_TYPE (t
));
7032 /* Begin compiling the definition of an enumeration type.
7033 NAME is its name (or null if anonymous).
7034 LOC is the enum's location.
7035 Returns the type object, as yet incomplete.
7036 Also records info about it so that build_enumerator
7037 may be used to declare the individual values as they are read. */
7040 start_enum (location_t loc
, struct c_enum_contents
*the_enum
, tree name
)
7042 tree enumtype
= NULL_TREE
;
7043 location_t enumloc
= UNKNOWN_LOCATION
;
7045 /* If this is the real definition for a previous forward reference,
7046 fill in the contents in the same object that used to be the
7047 forward reference. */
7049 if (name
!= NULL_TREE
)
7050 enumtype
= lookup_tag (ENUMERAL_TYPE
, name
, 1, &enumloc
);
7052 if (enumtype
== 0 || TREE_CODE (enumtype
) != ENUMERAL_TYPE
)
7054 enumtype
= make_node (ENUMERAL_TYPE
);
7055 pushtag (loc
, name
, enumtype
);
7058 if (C_TYPE_BEING_DEFINED (enumtype
))
7059 error_at (loc
, "nested redefinition of %<enum %E%>", name
);
7061 C_TYPE_BEING_DEFINED (enumtype
) = 1;
7063 if (TYPE_VALUES (enumtype
) != 0)
7065 /* This enum is a named one that has been declared already. */
7066 error_at (loc
, "redeclaration of %<enum %E%>", name
);
7067 if (enumloc
!= UNKNOWN_LOCATION
)
7068 inform (enumloc
, "originally defined here");
7070 /* Completely replace its old definition.
7071 The old enumerators remain defined, however. */
7072 TYPE_VALUES (enumtype
) = 0;
7075 the_enum
->enum_next_value
= integer_zero_node
;
7076 the_enum
->enum_overflow
= 0;
7078 if (flag_short_enums
)
7079 TYPE_PACKED (enumtype
) = 1;
7081 /* FIXME: This will issue a warning for a use of a type defined
7082 within sizeof in a statement expr. This is not terribly serious
7083 as C++ doesn't permit statement exprs within sizeof anyhow. */
7084 if (warn_cxx_compat
&& (in_sizeof
|| in_typeof
|| in_alignof
))
7085 warning_at (loc
, OPT_Wc___compat
,
7086 "defining type in %qs expression is invalid in C++",
7089 : (in_typeof
? "typeof" : "alignof")));
7094 /* After processing and defining all the values of an enumeration type,
7095 install their decls in the enumeration type and finish it off.
7096 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
7097 and ATTRIBUTES are the specified attributes.
7098 Returns ENUMTYPE. */
7101 finish_enum (tree enumtype
, tree values
, tree attributes
)
7104 tree minnode
= 0, maxnode
= 0;
7105 int precision
, unsign
;
7106 bool toplevel
= (file_scope
== current_scope
);
7107 struct lang_type
*lt
;
7109 decl_attributes (&enumtype
, attributes
, (int) ATTR_FLAG_TYPE_IN_PLACE
);
7111 /* Calculate the maximum value of any enumerator in this type. */
7113 if (values
== error_mark_node
)
7114 minnode
= maxnode
= integer_zero_node
;
7117 minnode
= maxnode
= TREE_VALUE (values
);
7118 for (pair
= TREE_CHAIN (values
); pair
; pair
= TREE_CHAIN (pair
))
7120 tree value
= TREE_VALUE (pair
);
7121 if (tree_int_cst_lt (maxnode
, value
))
7123 if (tree_int_cst_lt (value
, minnode
))
7128 /* Construct the final type of this enumeration. It is the same
7129 as one of the integral types - the narrowest one that fits, except
7130 that normally we only go as narrow as int - and signed iff any of
7131 the values are negative. */
7132 unsign
= (tree_int_cst_sgn (minnode
) >= 0);
7133 precision
= MAX (tree_int_cst_min_precision (minnode
, unsign
),
7134 tree_int_cst_min_precision (maxnode
, unsign
));
7136 if (TYPE_PACKED (enumtype
) || precision
> TYPE_PRECISION (integer_type_node
))
7138 tem
= c_common_type_for_size (precision
, unsign
);
7141 warning (0, "enumeration values exceed range of largest integer");
7142 tem
= long_long_integer_type_node
;
7146 tem
= unsign
? unsigned_type_node
: integer_type_node
;
7148 TYPE_MIN_VALUE (enumtype
) = TYPE_MIN_VALUE (tem
);
7149 TYPE_MAX_VALUE (enumtype
) = TYPE_MAX_VALUE (tem
);
7150 TYPE_UNSIGNED (enumtype
) = TYPE_UNSIGNED (tem
);
7151 TYPE_SIZE (enumtype
) = 0;
7153 /* If the precision of the type was specific with an attribute and it
7154 was too small, give an error. Otherwise, use it. */
7155 if (TYPE_PRECISION (enumtype
))
7157 if (precision
> TYPE_PRECISION (enumtype
))
7158 error ("specified mode too small for enumeral values");
7161 TYPE_PRECISION (enumtype
) = TYPE_PRECISION (tem
);
7163 layout_type (enumtype
);
7165 if (values
!= error_mark_node
)
7167 /* Change the type of the enumerators to be the enum type. We
7168 need to do this irrespective of the size of the enum, for
7169 proper type checking. Replace the DECL_INITIALs of the
7170 enumerators, and the value slots of the list, with copies
7171 that have the enum type; they cannot be modified in place
7172 because they may be shared (e.g. integer_zero_node) Finally,
7173 change the purpose slots to point to the names of the decls. */
7174 for (pair
= values
; pair
; pair
= TREE_CHAIN (pair
))
7176 tree enu
= TREE_PURPOSE (pair
);
7177 tree ini
= DECL_INITIAL (enu
);
7179 TREE_TYPE (enu
) = enumtype
;
7181 /* The ISO C Standard mandates enumerators to have type int,
7182 even though the underlying type of an enum type is
7183 unspecified. However, GCC allows enumerators of any
7184 integer type as an extensions. build_enumerator()
7185 converts any enumerators that fit in an int to type int,
7186 to avoid promotions to unsigned types when comparing
7187 integers with enumerators that fit in the int range.
7188 When -pedantic is given, build_enumerator() would have
7189 already warned about those that don't fit. Here we
7190 convert the rest to the enumerator type. */
7191 if (TREE_TYPE (ini
) != integer_type_node
)
7192 ini
= convert (enumtype
, ini
);
7194 DECL_INITIAL (enu
) = ini
;
7195 TREE_PURPOSE (pair
) = DECL_NAME (enu
);
7196 TREE_VALUE (pair
) = ini
;
7199 TYPE_VALUES (enumtype
) = values
;
7202 /* Record the min/max values so that we can warn about bit-field
7203 enumerations that are too small for the values. */
7204 lt
= GGC_CNEW (struct lang_type
);
7205 lt
->enum_min
= minnode
;
7206 lt
->enum_max
= maxnode
;
7207 TYPE_LANG_SPECIFIC (enumtype
) = lt
;
7209 /* Fix up all variant types of this enum type. */
7210 for (tem
= TYPE_MAIN_VARIANT (enumtype
); tem
; tem
= TYPE_NEXT_VARIANT (tem
))
7212 if (tem
== enumtype
)
7214 TYPE_VALUES (tem
) = TYPE_VALUES (enumtype
);
7215 TYPE_MIN_VALUE (tem
) = TYPE_MIN_VALUE (enumtype
);
7216 TYPE_MAX_VALUE (tem
) = TYPE_MAX_VALUE (enumtype
);
7217 TYPE_SIZE (tem
) = TYPE_SIZE (enumtype
);
7218 TYPE_SIZE_UNIT (tem
) = TYPE_SIZE_UNIT (enumtype
);
7219 SET_TYPE_MODE (tem
, TYPE_MODE (enumtype
));
7220 TYPE_PRECISION (tem
) = TYPE_PRECISION (enumtype
);
7221 TYPE_ALIGN (tem
) = TYPE_ALIGN (enumtype
);
7222 TYPE_USER_ALIGN (tem
) = TYPE_USER_ALIGN (enumtype
);
7223 TYPE_UNSIGNED (tem
) = TYPE_UNSIGNED (enumtype
);
7224 TYPE_LANG_SPECIFIC (tem
) = TYPE_LANG_SPECIFIC (enumtype
);
7227 /* Finish debugging output for this type. */
7228 rest_of_type_compilation (enumtype
, toplevel
);
7230 /* If this enum is defined inside a struct, add it to
7233 && struct_parse_info
!= NULL
7234 && !in_sizeof
&& !in_typeof
&& !in_alignof
)
7235 VEC_safe_push (tree
, heap
, struct_parse_info
->struct_types
, enumtype
);
7240 /* Build and install a CONST_DECL for one value of the
7241 current enumeration type (one that was begun with start_enum).
7242 LOC is the location of the enumerator.
7243 Return a tree-list containing the CONST_DECL and its value.
7244 Assignment of sequential values by default is handled here. */
7247 build_enumerator (location_t loc
,
7248 struct c_enum_contents
*the_enum
, tree name
, tree value
)
7252 /* Validate and default VALUE. */
7256 /* Don't issue more errors for error_mark_node (i.e. an
7257 undeclared identifier) - just ignore the value expression. */
7258 if (value
== error_mark_node
)
7260 else if (!INTEGRAL_TYPE_P (TREE_TYPE (value
)))
7262 error_at (loc
, "enumerator value for %qE is not an integer constant",
7268 if (TREE_CODE (value
) != INTEGER_CST
)
7270 value
= c_fully_fold (value
, false, NULL
);
7271 if (TREE_CODE (value
) == INTEGER_CST
)
7272 pedwarn (loc
, OPT_pedantic
,
7273 "enumerator value for %qE is not an integer "
7274 "constant expression", name
);
7276 if (TREE_CODE (value
) != INTEGER_CST
)
7278 error ("enumerator value for %qE is not an integer constant",
7284 value
= default_conversion (value
);
7285 constant_expression_warning (value
);
7290 /* Default based on previous value. */
7291 /* It should no longer be possible to have NON_LVALUE_EXPR
7295 value
= the_enum
->enum_next_value
;
7296 if (the_enum
->enum_overflow
)
7297 error_at (loc
, "overflow in enumeration values");
7299 /* Even though the underlying type of an enum is unspecified, the
7300 type of enumeration constants is explicitly defined as int
7301 (6.4.4.3/2 in the C99 Standard). GCC allows any integer type as
7303 else if (!int_fits_type_p (value
, integer_type_node
))
7304 pedwarn (loc
, OPT_pedantic
,
7305 "ISO C restricts enumerator values to range of %<int%>");
7307 /* The ISO C Standard mandates enumerators to have type int, even
7308 though the underlying type of an enum type is unspecified.
7309 However, GCC allows enumerators of any integer type as an
7310 extensions. Here we convert any enumerators that fit in an int
7311 to type int, to avoid promotions to unsigned types when comparing
7312 integers with enumerators that fit in the int range. When
7313 -pedantic is given, we would have already warned about those that
7314 don't fit. We have to do this here rather than in finish_enum
7315 because this value may be used to define more enumerators. */
7316 if (int_fits_type_p (value
, integer_type_node
))
7317 value
= convert (integer_type_node
, value
);
7319 /* Set basis for default for next value. */
7320 the_enum
->enum_next_value
7322 (EXPR_HAS_LOCATION (value
) ? EXPR_LOCATION (value
) : input_location
,
7323 PLUS_EXPR
, value
, integer_one_node
, 0);
7324 the_enum
->enum_overflow
= tree_int_cst_lt (the_enum
->enum_next_value
, value
);
7326 /* Now create a declaration for the enum value name. */
7328 type
= TREE_TYPE (value
);
7329 type
= c_common_type_for_size (MAX (TYPE_PRECISION (type
),
7330 TYPE_PRECISION (integer_type_node
)),
7331 (TYPE_PRECISION (type
)
7332 >= TYPE_PRECISION (integer_type_node
)
7333 && TYPE_UNSIGNED (type
)));
7335 decl
= build_decl (loc
, CONST_DECL
, name
, type
);
7336 DECL_INITIAL (decl
) = convert (type
, value
);
7339 return tree_cons (decl
, value
, NULL_TREE
);
7343 /* Create the FUNCTION_DECL for a function definition.
7344 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
7345 the declaration; they describe the function's name and the type it returns,
7346 but twisted together in a fashion that parallels the syntax of C.
7348 This function creates a binding context for the function body
7349 as well as setting up the FUNCTION_DECL in current_function_decl.
7351 Returns 1 on success. If the DECLARATOR is not suitable for a function
7352 (it defines a datum instead), we return 0, which tells
7353 yyparse to report a parse error. */
7356 start_function (struct c_declspecs
*declspecs
, struct c_declarator
*declarator
,
7359 tree decl1
, old_decl
;
7360 tree restype
, resdecl
;
7363 current_function_returns_value
= 0; /* Assume, until we see it does. */
7364 current_function_returns_null
= 0;
7365 current_function_returns_abnormally
= 0;
7366 warn_about_return_type
= 0;
7367 c_switch_stack
= NULL
;
7369 /* Indicate no valid break/continue context by setting these variables
7370 to some non-null, non-label value. We'll notice and emit the proper
7371 error message in c_finish_bc_stmt. */
7372 c_break_label
= c_cont_label
= size_zero_node
;
7374 decl1
= grokdeclarator (declarator
, declspecs
, FUNCDEF
, true, NULL
,
7375 &attributes
, NULL
, NULL
, DEPRECATED_NORMAL
);
7377 /* If the declarator is not suitable for a function definition,
7378 cause a syntax error. */
7382 loc
= DECL_SOURCE_LOCATION (decl1
);
7384 decl_attributes (&decl1
, attributes
, 0);
7386 if (DECL_DECLARED_INLINE_P (decl1
)
7387 && DECL_UNINLINABLE (decl1
)
7388 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1
)))
7389 warning_at (loc
, OPT_Wattributes
,
7390 "inline function %qD given attribute noinline",
7393 /* Handle gnu_inline attribute. */
7394 if (declspecs
->inline_p
7395 && !flag_gnu89_inline
7396 && TREE_CODE (decl1
) == FUNCTION_DECL
7397 && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl1
))
7398 || current_function_decl
))
7400 if (declspecs
->storage_class
!= csc_static
)
7401 DECL_EXTERNAL (decl1
) = !DECL_EXTERNAL (decl1
);
7404 announce_function (decl1
);
7406 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1
))))
7408 error_at (loc
, "return type is an incomplete type");
7409 /* Make it return void instead. */
7411 = build_function_type (void_type_node
,
7412 TYPE_ARG_TYPES (TREE_TYPE (decl1
)));
7415 if (warn_about_return_type
)
7416 pedwarn_c99 (loc
, flag_isoc99
? 0
7417 : (warn_return_type
? OPT_Wreturn_type
: OPT_Wimplicit_int
),
7418 "return type defaults to %<int%>");
7420 /* Make the init_value nonzero so pushdecl knows this is not tentative.
7421 error_mark_node is replaced below (in pop_scope) with the BLOCK. */
7422 DECL_INITIAL (decl1
) = error_mark_node
;
7424 /* If this definition isn't a prototype and we had a prototype declaration
7425 before, copy the arg type info from that prototype. */
7426 old_decl
= lookup_name_in_scope (DECL_NAME (decl1
), current_scope
);
7427 if (old_decl
&& TREE_CODE (old_decl
) != FUNCTION_DECL
)
7429 current_function_prototype_locus
= UNKNOWN_LOCATION
;
7430 current_function_prototype_built_in
= false;
7431 current_function_prototype_arg_types
= NULL_TREE
;
7432 if (TYPE_ARG_TYPES (TREE_TYPE (decl1
)) == 0)
7434 if (old_decl
!= 0 && TREE_CODE (TREE_TYPE (old_decl
)) == FUNCTION_TYPE
7435 && comptypes (TREE_TYPE (TREE_TYPE (decl1
)),
7436 TREE_TYPE (TREE_TYPE (old_decl
))))
7438 TREE_TYPE (decl1
) = composite_type (TREE_TYPE (old_decl
),
7440 current_function_prototype_locus
= DECL_SOURCE_LOCATION (old_decl
);
7441 current_function_prototype_built_in
7442 = C_DECL_BUILTIN_PROTOTYPE (old_decl
);
7443 current_function_prototype_arg_types
7444 = TYPE_ARG_TYPES (TREE_TYPE (decl1
));
7446 if (TREE_PUBLIC (decl1
))
7448 /* If there is an external prototype declaration of this
7449 function, record its location but do not copy information
7450 to this decl. This may be an invisible declaration
7451 (built-in or in a scope which has finished) or simply
7452 have more refined argument types than any declaration
7454 struct c_binding
*b
;
7455 for (b
= I_SYMBOL_BINDING (DECL_NAME (decl1
)); b
; b
= b
->shadowed
)
7456 if (B_IN_SCOPE (b
, external_scope
))
7460 tree ext_decl
, ext_type
;
7462 ext_type
= b
->u
.type
? b
->u
.type
: TREE_TYPE (ext_decl
);
7463 if (TREE_CODE (ext_type
) == FUNCTION_TYPE
7464 && comptypes (TREE_TYPE (TREE_TYPE (decl1
)),
7465 TREE_TYPE (ext_type
)))
7467 current_function_prototype_locus
7468 = DECL_SOURCE_LOCATION (ext_decl
);
7469 current_function_prototype_built_in
7470 = C_DECL_BUILTIN_PROTOTYPE (ext_decl
);
7471 current_function_prototype_arg_types
7472 = TYPE_ARG_TYPES (ext_type
);
7478 /* Optionally warn of old-fashioned def with no previous prototype. */
7479 if (warn_strict_prototypes
7480 && old_decl
!= error_mark_node
7481 && TYPE_ARG_TYPES (TREE_TYPE (decl1
)) == 0
7482 && C_DECL_ISNT_PROTOTYPE (old_decl
))
7483 warning_at (loc
, OPT_Wstrict_prototypes
,
7484 "function declaration isn%'t a prototype");
7485 /* Optionally warn of any global def with no previous prototype. */
7486 else if (warn_missing_prototypes
7487 && old_decl
!= error_mark_node
7488 && TREE_PUBLIC (decl1
)
7489 && !MAIN_NAME_P (DECL_NAME (decl1
))
7490 && C_DECL_ISNT_PROTOTYPE (old_decl
))
7491 warning_at (loc
, OPT_Wmissing_prototypes
,
7492 "no previous prototype for %qD", decl1
);
7493 /* Optionally warn of any def with no previous prototype
7494 if the function has already been used. */
7495 else if (warn_missing_prototypes
7497 && old_decl
!= error_mark_node
7498 && TREE_USED (old_decl
)
7499 && TYPE_ARG_TYPES (TREE_TYPE (old_decl
)) == 0)
7500 warning_at (loc
, OPT_Wmissing_prototypes
,
7501 "%qD was used with no prototype before its definition", decl1
);
7502 /* Optionally warn of any global def with no previous declaration. */
7503 else if (warn_missing_declarations
7504 && TREE_PUBLIC (decl1
)
7506 && !MAIN_NAME_P (DECL_NAME (decl1
)))
7507 warning_at (loc
, OPT_Wmissing_declarations
,
7508 "no previous declaration for %qD",
7510 /* Optionally warn of any def with no previous declaration
7511 if the function has already been used. */
7512 else if (warn_missing_declarations
7514 && old_decl
!= error_mark_node
7515 && TREE_USED (old_decl
)
7516 && C_DECL_IMPLICIT (old_decl
))
7517 warning_at (loc
, OPT_Wmissing_declarations
,
7518 "%qD was used with no declaration before its definition", decl1
);
7520 /* This function exists in static storage.
7521 (This does not mean `static' in the C sense!) */
7522 TREE_STATIC (decl1
) = 1;
7524 /* A nested function is not global. */
7525 if (current_function_decl
!= 0)
7526 TREE_PUBLIC (decl1
) = 0;
7528 /* This is the earliest point at which we might know the assembler
7529 name of the function. Thus, if it's set before this, die horribly. */
7530 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl1
));
7532 /* If #pragma weak was used, mark the decl weak now. */
7533 if (current_scope
== file_scope
)
7534 maybe_apply_pragma_weak (decl1
);
7536 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
7537 if (warn_main
&& MAIN_NAME_P (DECL_NAME (decl1
)))
7539 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1
)))
7540 != integer_type_node
)
7541 pedwarn (loc
, OPT_Wmain
, "return type of %qD is not %<int%>", decl1
);
7543 check_main_parameter_types (decl1
);
7545 if (!TREE_PUBLIC (decl1
))
7546 pedwarn (loc
, OPT_Wmain
,
7547 "%qD is normally a non-static function", decl1
);
7550 /* Record the decl so that the function name is defined.
7551 If we already have a decl for this name, and it is a FUNCTION_DECL,
7552 use the old decl. */
7554 current_function_decl
= pushdecl (decl1
);
7557 declare_parm_level ();
7559 restype
= TREE_TYPE (TREE_TYPE (current_function_decl
));
7560 resdecl
= build_decl (loc
, RESULT_DECL
, NULL_TREE
, restype
);
7561 DECL_ARTIFICIAL (resdecl
) = 1;
7562 DECL_IGNORED_P (resdecl
) = 1;
7563 DECL_RESULT (current_function_decl
) = resdecl
;
7565 start_fname_decls ();
7570 /* Subroutine of store_parm_decls which handles new-style function
7571 definitions (prototype format). The parms already have decls, so we
7572 need only record them as in effect and complain if any redundant
7573 old-style parm decls were written. */
7575 store_parm_decls_newstyle (tree fndecl
, const struct c_arg_info
*arg_info
)
7579 if (current_scope
->bindings
)
7581 error_at (DECL_SOURCE_LOCATION (fndecl
),
7582 "old-style parameter declarations in prototyped "
7583 "function definition");
7585 /* Get rid of the old-style declarations. */
7589 /* Don't issue this warning for nested functions, and don't issue this
7590 warning if we got here because ARG_INFO_TYPES was error_mark_node
7591 (this happens when a function definition has just an ellipsis in
7592 its parameter list). */
7593 else if (!in_system_header
&& !current_function_scope
7594 && arg_info
->types
!= error_mark_node
)
7595 warning_at (DECL_SOURCE_LOCATION (fndecl
), OPT_Wtraditional
,
7596 "traditional C rejects ISO C style function definitions");
7598 /* Now make all the parameter declarations visible in the function body.
7599 We can bypass most of the grunt work of pushdecl. */
7600 for (decl
= arg_info
->parms
; decl
; decl
= TREE_CHAIN (decl
))
7602 DECL_CONTEXT (decl
) = current_function_decl
;
7603 if (DECL_NAME (decl
))
7605 bind (DECL_NAME (decl
), decl
, current_scope
,
7606 /*invisible=*/false, /*nested=*/false,
7608 if (!TREE_USED (decl
))
7609 warn_if_shadowing (decl
);
7612 error_at (DECL_SOURCE_LOCATION (decl
), "parameter name omitted");
7615 /* Record the parameter list in the function declaration. */
7616 DECL_ARGUMENTS (fndecl
) = arg_info
->parms
;
7618 /* Now make all the ancillary declarations visible, likewise. */
7619 for (decl
= arg_info
->others
; decl
; decl
= TREE_CHAIN (decl
))
7621 DECL_CONTEXT (decl
) = current_function_decl
;
7622 if (DECL_NAME (decl
))
7623 bind (DECL_NAME (decl
), decl
, current_scope
,
7624 /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION
);
7627 /* And all the tag declarations. */
7628 for (decl
= arg_info
->tags
; decl
; decl
= TREE_CHAIN (decl
))
7629 if (TREE_PURPOSE (decl
))
7630 bind (TREE_PURPOSE (decl
), TREE_VALUE (decl
), current_scope
,
7631 /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION
);
7634 /* Subroutine of store_parm_decls which handles old-style function
7635 definitions (separate parameter list and declarations). */
7638 store_parm_decls_oldstyle (tree fndecl
, const struct c_arg_info
*arg_info
)
7640 struct c_binding
*b
;
7641 tree parm
, decl
, last
;
7642 tree parmids
= arg_info
->parms
;
7643 struct pointer_set_t
*seen_args
= pointer_set_create ();
7645 if (!in_system_header
)
7646 warning_at (DECL_SOURCE_LOCATION (fndecl
),
7647 OPT_Wold_style_definition
, "old-style function definition");
7649 /* Match each formal parameter name with its declaration. Save each
7650 decl in the appropriate TREE_PURPOSE slot of the parmids chain. */
7651 for (parm
= parmids
; parm
; parm
= TREE_CHAIN (parm
))
7653 if (TREE_VALUE (parm
) == 0)
7655 error_at (DECL_SOURCE_LOCATION (fndecl
),
7656 "parameter name missing from parameter list");
7657 TREE_PURPOSE (parm
) = 0;
7661 b
= I_SYMBOL_BINDING (TREE_VALUE (parm
));
7662 if (b
&& B_IN_CURRENT_SCOPE (b
))
7665 /* If we got something other than a PARM_DECL it is an error. */
7666 if (TREE_CODE (decl
) != PARM_DECL
)
7667 error_at (DECL_SOURCE_LOCATION (decl
),
7668 "%qD declared as a non-parameter", decl
);
7669 /* If the declaration is already marked, we have a duplicate
7670 name. Complain and ignore the duplicate. */
7671 else if (pointer_set_contains (seen_args
, decl
))
7673 error_at (DECL_SOURCE_LOCATION (decl
),
7674 "multiple parameters named %qD", decl
);
7675 TREE_PURPOSE (parm
) = 0;
7678 /* If the declaration says "void", complain and turn it into
7680 else if (VOID_TYPE_P (TREE_TYPE (decl
)))
7682 error_at (DECL_SOURCE_LOCATION (decl
),
7683 "parameter %qD declared with void type", decl
);
7684 TREE_TYPE (decl
) = integer_type_node
;
7685 DECL_ARG_TYPE (decl
) = integer_type_node
;
7686 layout_decl (decl
, 0);
7688 warn_if_shadowing (decl
);
7690 /* If no declaration found, default to int. */
7693 /* FIXME diagnostics: This should be the location of the argument,
7694 not the FNDECL. E.g., for an old-style declaration
7696 int f10(v) { blah; }
7698 We should use the location of the V, not the F10.
7699 Unfortunately, the V is an IDENTIFIER_NODE which has no
7700 location. In the future we need locations for c_arg_info
7703 See gcc.dg/Wshadow-3.c for an example of this problem. */
7704 decl
= build_decl (DECL_SOURCE_LOCATION (fndecl
),
7705 PARM_DECL
, TREE_VALUE (parm
), integer_type_node
);
7706 DECL_ARG_TYPE (decl
) = TREE_TYPE (decl
);
7708 warn_if_shadowing (decl
);
7711 pedwarn (DECL_SOURCE_LOCATION (decl
),
7712 0, "type of %qD defaults to %<int%>", decl
);
7714 warning_at (DECL_SOURCE_LOCATION (decl
),
7715 OPT_Wmissing_parameter_type
,
7716 "type of %qD defaults to %<int%>", decl
);
7719 TREE_PURPOSE (parm
) = decl
;
7720 pointer_set_insert (seen_args
, decl
);
7723 /* Now examine the parms chain for incomplete declarations
7724 and declarations with no corresponding names. */
7726 for (b
= current_scope
->bindings
; b
; b
= b
->prev
)
7729 if (TREE_CODE (parm
) != PARM_DECL
)
7732 if (TREE_TYPE (parm
) != error_mark_node
7733 && !COMPLETE_TYPE_P (TREE_TYPE (parm
)))
7735 error_at (DECL_SOURCE_LOCATION (parm
),
7736 "parameter %qD has incomplete type", parm
);
7737 TREE_TYPE (parm
) = error_mark_node
;
7740 if (!pointer_set_contains (seen_args
, parm
))
7742 error_at (DECL_SOURCE_LOCATION (parm
),
7743 "declaration for parameter %qD but no such parameter",
7746 /* Pretend the parameter was not missing.
7747 This gets us to a standard state and minimizes
7748 further error messages. */
7749 parmids
= chainon (parmids
, tree_cons (parm
, 0, 0));
7753 /* Chain the declarations together in the order of the list of
7754 names. Store that chain in the function decl, replacing the
7755 list of names. Update the current scope to match. */
7756 DECL_ARGUMENTS (fndecl
) = 0;
7758 for (parm
= parmids
; parm
; parm
= TREE_CHAIN (parm
))
7759 if (TREE_PURPOSE (parm
))
7761 if (parm
&& TREE_PURPOSE (parm
))
7763 last
= TREE_PURPOSE (parm
);
7764 DECL_ARGUMENTS (fndecl
) = last
;
7766 for (parm
= TREE_CHAIN (parm
); parm
; parm
= TREE_CHAIN (parm
))
7767 if (TREE_PURPOSE (parm
))
7769 TREE_CHAIN (last
) = TREE_PURPOSE (parm
);
7770 last
= TREE_PURPOSE (parm
);
7772 TREE_CHAIN (last
) = 0;
7775 pointer_set_destroy (seen_args
);
7777 /* If there was a previous prototype,
7778 set the DECL_ARG_TYPE of each argument according to
7779 the type previously specified, and report any mismatches. */
7781 if (current_function_prototype_arg_types
)
7784 for (parm
= DECL_ARGUMENTS (fndecl
),
7785 type
= current_function_prototype_arg_types
;
7786 parm
|| (type
&& TREE_VALUE (type
) != error_mark_node
7787 && (TYPE_MAIN_VARIANT (TREE_VALUE (type
)) != void_type_node
));
7788 parm
= TREE_CHAIN (parm
), type
= TREE_CHAIN (type
))
7790 if (parm
== 0 || type
== 0
7791 || TYPE_MAIN_VARIANT (TREE_VALUE (type
)) == void_type_node
)
7793 if (current_function_prototype_built_in
)
7794 warning_at (DECL_SOURCE_LOCATION (fndecl
),
7795 0, "number of arguments doesn%'t match "
7796 "built-in prototype");
7799 /* FIXME diagnostics: This should be the location of
7800 FNDECL, but there is bug when a prototype is
7801 declared inside function context, but defined
7802 outside of it (e.g., gcc.dg/pr15698-2.c). In
7803 which case FNDECL gets the location of the
7804 prototype, not the definition. */
7805 error_at (input_location
,
7806 "number of arguments doesn%'t match prototype");
7808 error_at (current_function_prototype_locus
,
7809 "prototype declaration");
7813 /* Type for passing arg must be consistent with that
7814 declared for the arg. ISO C says we take the unqualified
7815 type for parameters declared with qualified type. */
7816 if (TREE_TYPE (parm
) != error_mark_node
7817 && TREE_TYPE (type
) != error_mark_node
7818 && !comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm
)),
7819 TYPE_MAIN_VARIANT (TREE_VALUE (type
))))
7821 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm
))
7822 == TYPE_MAIN_VARIANT (TREE_VALUE (type
)))
7824 /* Adjust argument to match prototype. E.g. a previous
7825 `int foo(float);' prototype causes
7826 `int foo(x) float x; {...}' to be treated like
7827 `int foo(float x) {...}'. This is particularly
7828 useful for argument types like uid_t. */
7829 DECL_ARG_TYPE (parm
) = TREE_TYPE (parm
);
7831 if (targetm
.calls
.promote_prototypes (TREE_TYPE (current_function_decl
))
7832 && INTEGRAL_TYPE_P (TREE_TYPE (parm
))
7833 && TYPE_PRECISION (TREE_TYPE (parm
))
7834 < TYPE_PRECISION (integer_type_node
))
7835 DECL_ARG_TYPE (parm
) = integer_type_node
;
7837 /* ??? Is it possible to get here with a
7838 built-in prototype or will it always have
7839 been diagnosed as conflicting with an
7840 old-style definition and discarded? */
7841 if (current_function_prototype_built_in
)
7842 warning_at (DECL_SOURCE_LOCATION (parm
),
7843 OPT_pedantic
, "promoted argument %qD "
7844 "doesn%'t match built-in prototype", parm
);
7847 pedwarn (DECL_SOURCE_LOCATION (parm
),
7848 OPT_pedantic
, "promoted argument %qD "
7849 "doesn%'t match prototype", parm
);
7850 pedwarn (current_function_prototype_locus
, OPT_pedantic
,
7851 "prototype declaration");
7856 if (current_function_prototype_built_in
)
7857 warning_at (DECL_SOURCE_LOCATION (parm
),
7858 0, "argument %qD doesn%'t match "
7859 "built-in prototype", parm
);
7862 error_at (DECL_SOURCE_LOCATION (parm
),
7863 "argument %qD doesn%'t match prototype", parm
);
7864 error_at (current_function_prototype_locus
,
7865 "prototype declaration");
7870 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl
)) = 0;
7873 /* Otherwise, create a prototype that would match. */
7877 tree actual
= 0, last
= 0, type
;
7879 for (parm
= DECL_ARGUMENTS (fndecl
); parm
; parm
= TREE_CHAIN (parm
))
7881 type
= tree_cons (NULL_TREE
, DECL_ARG_TYPE (parm
), NULL_TREE
);
7883 TREE_CHAIN (last
) = type
;
7888 type
= tree_cons (NULL_TREE
, void_type_node
, NULL_TREE
);
7890 TREE_CHAIN (last
) = type
;
7894 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
7895 of the type of this function, but we need to avoid having this
7896 affect the types of other similarly-typed functions, so we must
7897 first force the generation of an identical (but separate) type
7898 node for the relevant function type. The new node we create
7899 will be a variant of the main variant of the original function
7902 TREE_TYPE (fndecl
) = build_variant_type_copy (TREE_TYPE (fndecl
));
7904 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl
)) = actual
;
7908 /* Store parameter declarations passed in ARG_INFO into the current
7909 function declaration. */
7912 store_parm_decls_from (struct c_arg_info
*arg_info
)
7914 current_function_arg_info
= arg_info
;
7915 store_parm_decls ();
7918 /* Store the parameter declarations into the current function declaration.
7919 This is called after parsing the parameter declarations, before
7920 digesting the body of the function.
7922 For an old-style definition, construct a prototype out of the old-style
7923 parameter declarations and inject it into the function's type. */
7926 store_parm_decls (void)
7928 tree fndecl
= current_function_decl
;
7931 /* The argument information block for FNDECL. */
7932 struct c_arg_info
*arg_info
= current_function_arg_info
;
7933 current_function_arg_info
= 0;
7935 /* True if this definition is written with a prototype. Note:
7936 despite C99 6.7.5.3p14, we can *not* treat an empty argument
7937 list in a function definition as equivalent to (void) -- an
7938 empty argument list specifies the function has no parameters,
7939 but only (void) sets up a prototype for future calls. */
7940 proto
= arg_info
->types
!= 0;
7943 store_parm_decls_newstyle (fndecl
, arg_info
);
7945 store_parm_decls_oldstyle (fndecl
, arg_info
);
7947 /* The next call to push_scope will be a function body. */
7949 next_is_function_body
= true;
7951 /* Write a record describing this function definition to the prototypes
7952 file (if requested). */
7954 gen_aux_info_record (fndecl
, 1, 0, proto
);
7956 /* Initialize the RTL code for the function. */
7957 allocate_struct_function (fndecl
, false);
7959 /* Begin the statement tree for this function. */
7960 DECL_SAVED_TREE (fndecl
) = push_stmt_list ();
7962 /* ??? Insert the contents of the pending sizes list into the function
7963 to be evaluated. The only reason left to have this is
7964 void foo(int n, int array[n++])
7965 because we throw away the array type in favor of a pointer type, and
7966 thus won't naturally see the SAVE_EXPR containing the increment. All
7967 other pending sizes would be handled by gimplify_parameters. */
7970 for (t
= nreverse (get_pending_sizes ()); t
; t
= TREE_CHAIN (t
))
7971 add_stmt (TREE_VALUE (t
));
7974 /* Even though we're inside a function body, we still don't want to
7975 call expand_expr to calculate the size of a variable-sized array.
7976 We haven't necessarily assigned RTL to all variables yet, so it's
7977 not safe to try to expand expressions involving them. */
7978 cfun
->dont_save_pending_sizes_p
= 1;
7982 /* Finish up a function declaration and compile that function
7983 all the way to assembler language output. The free the storage
7984 for the function definition.
7986 This is called after parsing the body of the function definition. */
7989 finish_function (void)
7991 tree fndecl
= current_function_decl
;
7993 if (TREE_CODE (fndecl
) == FUNCTION_DECL
7994 && targetm
.calls
.promote_prototypes (TREE_TYPE (fndecl
)))
7996 tree args
= DECL_ARGUMENTS (fndecl
);
7997 for (; args
; args
= TREE_CHAIN (args
))
7999 tree type
= TREE_TYPE (args
);
8000 if (INTEGRAL_TYPE_P (type
)
8001 && TYPE_PRECISION (type
) < TYPE_PRECISION (integer_type_node
))
8002 DECL_ARG_TYPE (args
) = integer_type_node
;
8006 if (DECL_INITIAL (fndecl
) && DECL_INITIAL (fndecl
) != error_mark_node
)
8007 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl
)) = fndecl
;
8009 /* Must mark the RESULT_DECL as being in this function. */
8011 if (DECL_RESULT (fndecl
) && DECL_RESULT (fndecl
) != error_mark_node
)
8012 DECL_CONTEXT (DECL_RESULT (fndecl
)) = fndecl
;
8014 if (MAIN_NAME_P (DECL_NAME (fndecl
)) && flag_hosted
8015 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl
)))
8016 == integer_type_node
&& flag_isoc99
)
8018 /* Hack. We don't want the middle-end to warn that this return
8019 is unreachable, so we mark its location as special. Using
8020 UNKNOWN_LOCATION has the problem that it gets clobbered in
8021 annotate_one_with_locus. A cleaner solution might be to
8022 ensure ! should_carry_locus_p (stmt), but that needs a flag.
8024 c_finish_return (BUILTINS_LOCATION
, integer_zero_node
, NULL_TREE
);
8027 /* Tie off the statement tree for this function. */
8028 DECL_SAVED_TREE (fndecl
) = pop_stmt_list (DECL_SAVED_TREE (fndecl
));
8030 finish_fname_decls ();
8032 /* Complain if there's just no return statement. */
8033 if (warn_return_type
8034 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl
))) != VOID_TYPE
8035 && !current_function_returns_value
&& !current_function_returns_null
8036 /* Don't complain if we are no-return. */
8037 && !current_function_returns_abnormally
8038 /* Don't complain if we are declared noreturn. */
8039 && !TREE_THIS_VOLATILE (fndecl
)
8040 /* Don't warn for main(). */
8041 && !MAIN_NAME_P (DECL_NAME (fndecl
))
8042 /* Or if they didn't actually specify a return type. */
8043 && !C_FUNCTION_IMPLICIT_INT (fndecl
)
8044 /* Normally, with -Wreturn-type, flow will complain, but we might
8045 optimize out static functions. */
8046 && !TREE_PUBLIC (fndecl
))
8048 warning (OPT_Wreturn_type
,
8049 "no return statement in function returning non-void");
8050 TREE_NO_WARNING (fndecl
) = 1;
8053 /* Store the end of the function, so that we get good line number
8054 info for the epilogue. */
8055 cfun
->function_end_locus
= input_location
;
8057 /* Finalize the ELF visibility for the function. */
8058 c_determine_visibility (fndecl
);
8060 /* For GNU C extern inline functions disregard inline limits. */
8061 if (DECL_EXTERNAL (fndecl
)
8062 && DECL_DECLARED_INLINE_P (fndecl
))
8063 DECL_DISREGARD_INLINE_LIMITS (fndecl
) = 1;
8065 /* Genericize before inlining. Delay genericizing nested functions
8066 until their parent function is genericized. Since finalizing
8067 requires GENERIC, delay that as well. */
8069 if (DECL_INITIAL (fndecl
) && DECL_INITIAL (fndecl
) != error_mark_node
8070 && !undef_nested_function
)
8072 if (!decl_function_context (fndecl
))
8074 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE
, fndecl
);
8075 c_genericize (fndecl
);
8077 /* ??? Objc emits functions after finalizing the compilation unit.
8078 This should be cleaned up later and this conditional removed. */
8079 if (cgraph_global_info_ready
)
8081 cgraph_add_new_function (fndecl
, false);
8084 cgraph_finalize_function (fndecl
, false);
8088 /* Register this function with cgraph just far enough to get it
8089 added to our parent's nested function list. Handy, since the
8090 C front end doesn't have such a list. */
8091 (void) cgraph_node (fndecl
);
8095 if (!decl_function_context (fndecl
))
8096 undef_nested_function
= false;
8098 /* We're leaving the context of this function, so zap cfun.
8099 It's still in DECL_STRUCT_FUNCTION, and we'll restore it in
8100 tree_rest_of_compilation. */
8102 current_function_decl
= NULL
;
8105 /* Check the declarations given in a for-loop for satisfying the C99
8106 constraints. If exactly one such decl is found, return it. LOC is
8107 the location of the opening parenthesis of the for loop. */
8110 check_for_loop_decls (location_t loc
)
8112 struct c_binding
*b
;
8113 tree one_decl
= NULL_TREE
;
8118 static bool hint
= true;
8119 /* If we get here, declarations have been used in a for loop without
8120 the C99 for loop scope. This doesn't make much sense, so don't
8122 error_at (loc
, "%<for%> loop initial declarations "
8123 "are only allowed in C99 mode");
8127 "use option -std=c99 or -std=gnu99 to compile your code");
8132 /* C99 subclause 6.8.5 paragraph 3:
8134 [#3] The declaration part of a for statement shall only
8135 declare identifiers for objects having storage class auto or
8138 It isn't clear whether, in this sentence, "identifiers" binds to
8139 "shall only declare" or to "objects" - that is, whether all identifiers
8140 declared must be identifiers for objects, or whether the restriction
8141 only applies to those that are. (A question on this in comp.std.c
8142 in November 2000 received no answer.) We implement the strictest
8143 interpretation, to avoid creating an extension which later causes
8146 for (b
= current_scope
->bindings
; b
; b
= b
->prev
)
8149 tree decl
= b
->decl
;
8154 switch (TREE_CODE (decl
))
8158 location_t decl_loc
= DECL_SOURCE_LOCATION (decl
);
8159 if (TREE_STATIC (decl
))
8161 "declaration of static variable %qD in %<for%> loop "
8162 "initial declaration", decl
);
8163 else if (DECL_EXTERNAL (decl
))
8165 "declaration of %<extern%> variable %qD in %<for%> loop "
8166 "initial declaration", decl
);
8172 "%<struct %E%> declared in %<for%> loop initial "
8177 "%<union %E%> declared in %<for%> loop initial declaration",
8181 error_at (loc
, "%<enum %E%> declared in %<for%> loop "
8182 "initial declaration", id
);
8185 error_at (loc
, "declaration of non-variable "
8186 "%qD in %<for%> loop initial declaration", decl
);
8193 return n_decls
== 1 ? one_decl
: NULL_TREE
;
8196 /* Save and reinitialize the variables
8197 used during compilation of a C function. */
8200 c_push_function_context (void)
8202 struct language_function
*p
;
8203 p
= GGC_NEW (struct language_function
);
8206 p
->base
.x_stmt_tree
= c_stmt_tree
;
8207 p
->x_break_label
= c_break_label
;
8208 p
->x_cont_label
= c_cont_label
;
8209 p
->x_switch_stack
= c_switch_stack
;
8210 p
->arg_info
= current_function_arg_info
;
8211 p
->returns_value
= current_function_returns_value
;
8212 p
->returns_null
= current_function_returns_null
;
8213 p
->returns_abnormally
= current_function_returns_abnormally
;
8214 p
->warn_about_return_type
= warn_about_return_type
;
8216 push_function_context ();
8219 /* Restore the variables used during compilation of a C function. */
8222 c_pop_function_context (void)
8224 struct language_function
*p
;
8226 pop_function_context ();
8228 cfun
->language
= NULL
;
8230 if (DECL_STRUCT_FUNCTION (current_function_decl
) == 0
8231 && DECL_SAVED_TREE (current_function_decl
) == NULL_TREE
)
8233 /* Stop pointing to the local nodes about to be freed. */
8234 /* But DECL_INITIAL must remain nonzero so we know this
8235 was an actual function definition. */
8236 DECL_INITIAL (current_function_decl
) = error_mark_node
;
8237 DECL_ARGUMENTS (current_function_decl
) = 0;
8240 c_stmt_tree
= p
->base
.x_stmt_tree
;
8241 c_break_label
= p
->x_break_label
;
8242 c_cont_label
= p
->x_cont_label
;
8243 c_switch_stack
= p
->x_switch_stack
;
8244 current_function_arg_info
= p
->arg_info
;
8245 current_function_returns_value
= p
->returns_value
;
8246 current_function_returns_null
= p
->returns_null
;
8247 current_function_returns_abnormally
= p
->returns_abnormally
;
8248 warn_about_return_type
= p
->warn_about_return_type
;
8251 /* The functions below are required for functionality of doing
8252 function at once processing in the C front end. Currently these
8253 functions are not called from anywhere in the C front end, but as
8254 these changes continue, that will change. */
8256 /* Returns the stmt_tree (if any) to which statements are currently
8257 being added. If there is no active statement-tree, NULL is
8261 current_stmt_tree (void)
8263 return &c_stmt_tree
;
8266 /* Return the global value of T as a symbol. */
8269 identifier_global_value (tree t
)
8271 struct c_binding
*b
;
8273 for (b
= I_SYMBOL_BINDING (t
); b
; b
= b
->shadowed
)
8274 if (B_IN_FILE_SCOPE (b
) || B_IN_EXTERNAL_SCOPE (b
))
8280 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
8281 otherwise the name is found in ridpointers from RID_INDEX. */
8284 record_builtin_type (enum rid rid_index
, const char *name
, tree type
)
8288 id
= ridpointers
[(int) rid_index
];
8290 id
= get_identifier (name
);
8291 decl
= build_decl (UNKNOWN_LOCATION
, TYPE_DECL
, id
, type
);
8293 if (debug_hooks
->type_decl
)
8294 debug_hooks
->type_decl (decl
, false);
8297 /* Build the void_list_node (void_type_node having been created). */
8299 build_void_list_node (void)
8301 tree t
= build_tree_list (NULL_TREE
, void_type_node
);
8305 /* Return a c_parm structure with the given SPECS, ATTRS and DECLARATOR. */
8308 build_c_parm (struct c_declspecs
*specs
, tree attrs
,
8309 struct c_declarator
*declarator
)
8311 struct c_parm
*ret
= XOBNEW (&parser_obstack
, struct c_parm
);
8314 ret
->declarator
= declarator
;
8318 /* Return a declarator with nested attributes. TARGET is the inner
8319 declarator to which these attributes apply. ATTRS are the
8322 struct c_declarator
*
8323 build_attrs_declarator (tree attrs
, struct c_declarator
*target
)
8325 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
8326 ret
->kind
= cdk_attrs
;
8327 ret
->declarator
= target
;
8328 ret
->u
.attrs
= attrs
;
8332 /* Return a declarator for a function with arguments specified by ARGS
8333 and return type specified by TARGET. */
8335 struct c_declarator
*
8336 build_function_declarator (struct c_arg_info
*args
,
8337 struct c_declarator
*target
)
8339 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
8340 ret
->kind
= cdk_function
;
8341 ret
->declarator
= target
;
8342 ret
->u
.arg_info
= args
;
8346 /* Return a declarator for the identifier IDENT (which may be
8347 NULL_TREE for an abstract declarator). */
8349 struct c_declarator
*
8350 build_id_declarator (tree ident
)
8352 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
8354 ret
->declarator
= 0;
8356 /* Default value - may get reset to a more precise location. */
8357 ret
->id_loc
= input_location
;
8361 /* Return something to represent absolute declarators containing a *.
8362 TARGET is the absolute declarator that the * contains.
8363 TYPE_QUALS_ATTRS is a structure for type qualifiers and attributes
8364 to apply to the pointer type. */
8366 struct c_declarator
*
8367 make_pointer_declarator (struct c_declspecs
*type_quals_attrs
,
8368 struct c_declarator
*target
)
8372 struct c_declarator
*itarget
= target
;
8373 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
8374 if (type_quals_attrs
)
8376 attrs
= type_quals_attrs
->attrs
;
8377 quals
= quals_from_declspecs (type_quals_attrs
);
8378 if (attrs
!= NULL_TREE
)
8379 itarget
= build_attrs_declarator (attrs
, target
);
8381 ret
->kind
= cdk_pointer
;
8382 ret
->declarator
= itarget
;
8383 ret
->u
.pointer_quals
= quals
;
8387 /* Return a pointer to a structure for an empty list of declaration
8390 struct c_declspecs
*
8391 build_null_declspecs (void)
8393 struct c_declspecs
*ret
= XOBNEW (&parser_obstack
, struct c_declspecs
);
8398 ret
->typespec_word
= cts_none
;
8399 ret
->storage_class
= csc_none
;
8400 ret
->expr_const_operands
= true;
8401 ret
->declspecs_seen_p
= false;
8402 ret
->type_seen_p
= false;
8403 ret
->non_sc_seen_p
= false;
8404 ret
->typedef_p
= false;
8405 ret
->tag_defined_p
= false;
8406 ret
->explicit_signed_p
= false;
8407 ret
->deprecated_p
= false;
8408 ret
->default_int_p
= false;
8409 ret
->long_p
= false;
8410 ret
->long_long_p
= false;
8411 ret
->short_p
= false;
8412 ret
->signed_p
= false;
8413 ret
->unsigned_p
= false;
8414 ret
->complex_p
= false;
8415 ret
->inline_p
= false;
8416 ret
->thread_p
= false;
8417 ret
->const_p
= false;
8418 ret
->volatile_p
= false;
8419 ret
->restrict_p
= false;
8420 ret
->saturating_p
= false;
8421 ret
->address_space
= ADDR_SPACE_GENERIC
;
8425 /* Add the address space ADDRSPACE to the declaration specifiers
8426 SPECS, returning SPECS. */
8428 struct c_declspecs
*
8429 declspecs_add_addrspace (struct c_declspecs
*specs
, addr_space_t as
)
8431 specs
->non_sc_seen_p
= true;
8432 specs
->declspecs_seen_p
= true;
8434 if (!ADDR_SPACE_GENERIC_P (specs
->address_space
)
8435 && specs
->address_space
!= as
)
8436 error ("incompatible address space qualifiers %qs and %qs",
8437 c_addr_space_name (as
),
8438 c_addr_space_name (specs
->address_space
));
8440 specs
->address_space
= as
;
8444 /* Add the type qualifier QUAL to the declaration specifiers SPECS,
8447 struct c_declspecs
*
8448 declspecs_add_qual (struct c_declspecs
*specs
, tree qual
)
8452 specs
->non_sc_seen_p
= true;
8453 specs
->declspecs_seen_p
= true;
8454 gcc_assert (TREE_CODE (qual
) == IDENTIFIER_NODE
8455 && C_IS_RESERVED_WORD (qual
));
8456 i
= C_RID_CODE (qual
);
8460 dupe
= specs
->const_p
;
8461 specs
->const_p
= true;
8464 dupe
= specs
->volatile_p
;
8465 specs
->volatile_p
= true;
8468 dupe
= specs
->restrict_p
;
8469 specs
->restrict_p
= true;
8474 if (dupe
&& !flag_isoc99
)
8475 pedwarn (input_location
, OPT_pedantic
, "duplicate %qE", qual
);
8479 /* Add the type specifier TYPE to the declaration specifiers SPECS,
8482 struct c_declspecs
*
8483 declspecs_add_type (location_t loc
, struct c_declspecs
*specs
,
8484 struct c_typespec spec
)
8486 tree type
= spec
.spec
;
8487 specs
->non_sc_seen_p
= true;
8488 specs
->declspecs_seen_p
= true;
8489 specs
->type_seen_p
= true;
8490 if (TREE_DEPRECATED (type
))
8491 specs
->deprecated_p
= true;
8493 /* Handle type specifier keywords. */
8494 if (TREE_CODE (type
) == IDENTIFIER_NODE
8495 && C_IS_RESERVED_WORD (type
)
8496 && C_RID_CODE (type
) != RID_CXX_COMPAT_WARN
)
8498 enum rid i
= C_RID_CODE (type
);
8501 error_at (loc
, "two or more data types in declaration specifiers");
8504 if ((int) i
<= (int) RID_LAST_MODIFIER
)
8506 /* "long", "short", "signed", "unsigned", "_Complex" or "_Sat". */
8511 if (specs
->long_long_p
)
8513 error_at (loc
, "%<long long long%> is too long for GCC");
8518 if (specs
->typespec_word
== cts_double
)
8521 ("both %<long long%> and %<double%> in "
8522 "declaration specifiers"));
8525 pedwarn_c90 (loc
, OPT_Wlong_long
,
8526 "ISO C90 does not support %<long long%>");
8527 specs
->long_long_p
= 1;
8532 ("both %<long%> and %<short%> in "
8533 "declaration specifiers"));
8534 else if (specs
->typespec_word
== cts_void
)
8536 ("both %<long%> and %<void%> in "
8537 "declaration specifiers"));
8538 else if (specs
->typespec_word
== cts_bool
)
8540 ("both %<long%> and %<_Bool%> in "
8541 "declaration specifiers"));
8542 else if (specs
->typespec_word
== cts_char
)
8544 ("both %<long%> and %<char%> in "
8545 "declaration specifiers"));
8546 else if (specs
->typespec_word
== cts_float
)
8548 ("both %<long%> and %<float%> in "
8549 "declaration specifiers"));
8550 else if (specs
->typespec_word
== cts_dfloat32
)
8552 ("both %<long%> and %<_Decimal32%> in "
8553 "declaration specifiers"));
8554 else if (specs
->typespec_word
== cts_dfloat64
)
8556 ("both %<long%> and %<_Decimal64%> in "
8557 "declaration specifiers"));
8558 else if (specs
->typespec_word
== cts_dfloat128
)
8560 ("both %<long%> and %<_Decimal128%> in "
8561 "declaration specifiers"));
8563 specs
->long_p
= true;
8566 dupe
= specs
->short_p
;
8569 ("both %<long%> and %<short%> in "
8570 "declaration specifiers"));
8571 else if (specs
->typespec_word
== cts_void
)
8573 ("both %<short%> and %<void%> in "
8574 "declaration specifiers"));
8575 else if (specs
->typespec_word
== cts_bool
)
8577 ("both %<short%> and %<_Bool%> in "
8578 "declaration specifiers"));
8579 else if (specs
->typespec_word
== cts_char
)
8581 ("both %<short%> and %<char%> in "
8582 "declaration specifiers"));
8583 else if (specs
->typespec_word
== cts_float
)
8585 ("both %<short%> and %<float%> in "
8586 "declaration specifiers"));
8587 else if (specs
->typespec_word
== cts_double
)
8589 ("both %<short%> and %<double%> in "
8590 "declaration specifiers"));
8591 else if (specs
->typespec_word
== cts_dfloat32
)
8593 ("both %<short%> and %<_Decimal32%> in "
8594 "declaration specifiers"));
8595 else if (specs
->typespec_word
== cts_dfloat64
)
8597 ("both %<short%> and %<_Decimal64%> in "
8598 "declaration specifiers"));
8599 else if (specs
->typespec_word
== cts_dfloat128
)
8601 ("both %<short%> and %<_Decimal128%> in "
8602 "declaration specifiers"));
8604 specs
->short_p
= true;
8607 dupe
= specs
->signed_p
;
8608 if (specs
->unsigned_p
)
8610 ("both %<signed%> and %<unsigned%> in "
8611 "declaration specifiers"));
8612 else if (specs
->typespec_word
== cts_void
)
8614 ("both %<signed%> and %<void%> in "
8615 "declaration specifiers"));
8616 else if (specs
->typespec_word
== cts_bool
)
8618 ("both %<signed%> and %<_Bool%> in "
8619 "declaration specifiers"));
8620 else if (specs
->typespec_word
== cts_float
)
8622 ("both %<signed%> and %<float%> in "
8623 "declaration specifiers"));
8624 else if (specs
->typespec_word
== cts_double
)
8626 ("both %<signed%> and %<double%> in "
8627 "declaration specifiers"));
8628 else if (specs
->typespec_word
== cts_dfloat32
)
8630 ("both %<signed%> and %<_Decimal32%> in "
8631 "declaration specifiers"));
8632 else if (specs
->typespec_word
== cts_dfloat64
)
8634 ("both %<signed%> and %<_Decimal64%> in "
8635 "declaration specifiers"));
8636 else if (specs
->typespec_word
== cts_dfloat128
)
8638 ("both %<signed%> and %<_Decimal128%> in "
8639 "declaration specifiers"));
8641 specs
->signed_p
= true;
8644 dupe
= specs
->unsigned_p
;
8645 if (specs
->signed_p
)
8647 ("both %<signed%> and %<unsigned%> in "
8648 "declaration specifiers"));
8649 else if (specs
->typespec_word
== cts_void
)
8651 ("both %<unsigned%> and %<void%> in "
8652 "declaration specifiers"));
8653 else if (specs
->typespec_word
== cts_bool
)
8655 ("both %<unsigned%> and %<_Bool%> in "
8656 "declaration specifiers"));
8657 else if (specs
->typespec_word
== cts_float
)
8659 ("both %<unsigned%> and %<float%> in "
8660 "declaration specifiers"));
8661 else if (specs
->typespec_word
== cts_double
)
8663 ("both %<unsigned%> and %<double%> in "
8664 "declaration specifiers"));
8665 else if (specs
->typespec_word
== cts_dfloat32
)
8667 ("both %<unsigned%> and %<_Decimal32%> in "
8668 "declaration specifiers"));
8669 else if (specs
->typespec_word
== cts_dfloat64
)
8671 ("both %<unsigned%> and %<_Decimal64%> in "
8672 "declaration specifiers"));
8673 else if (specs
->typespec_word
== cts_dfloat128
)
8675 ("both %<unsigned%> and %<_Decimal128%> in "
8676 "declaration specifiers"));
8678 specs
->unsigned_p
= true;
8681 dupe
= specs
->complex_p
;
8682 if (!flag_isoc99
&& !in_system_header
)
8683 pedwarn (loc
, OPT_pedantic
,
8684 "ISO C90 does not support complex types");
8685 if (specs
->typespec_word
== cts_void
)
8687 ("both %<complex%> and %<void%> in "
8688 "declaration specifiers"));
8689 else if (specs
->typespec_word
== cts_bool
)
8691 ("both %<complex%> and %<_Bool%> in "
8692 "declaration specifiers"));
8693 else if (specs
->typespec_word
== cts_dfloat32
)
8695 ("both %<complex%> and %<_Decimal32%> in "
8696 "declaration specifiers"));
8697 else if (specs
->typespec_word
== cts_dfloat64
)
8699 ("both %<complex%> and %<_Decimal64%> in "
8700 "declaration specifiers"));
8701 else if (specs
->typespec_word
== cts_dfloat128
)
8703 ("both %<complex%> and %<_Decimal128%> in "
8704 "declaration specifiers"));
8705 else if (specs
->typespec_word
== cts_fract
)
8707 ("both %<complex%> and %<_Fract%> in "
8708 "declaration specifiers"));
8709 else if (specs
->typespec_word
== cts_accum
)
8711 ("both %<complex%> and %<_Accum%> in "
8712 "declaration specifiers"));
8713 else if (specs
->saturating_p
)
8715 ("both %<complex%> and %<_Sat%> in "
8716 "declaration specifiers"));
8718 specs
->complex_p
= true;
8721 dupe
= specs
->saturating_p
;
8722 pedwarn (loc
, OPT_pedantic
,
8723 "ISO C does not support saturating types");
8724 if (specs
->typespec_word
== cts_void
)
8726 ("both %<_Sat%> and %<void%> in "
8727 "declaration specifiers"));
8728 else if (specs
->typespec_word
== cts_bool
)
8730 ("both %<_Sat%> and %<_Bool%> in "
8731 "declaration specifiers"));
8732 else if (specs
->typespec_word
== cts_char
)
8734 ("both %<_Sat%> and %<char%> in "
8735 "declaration specifiers"));
8736 else if (specs
->typespec_word
== cts_int
)
8738 ("both %<_Sat%> and %<int%> in "
8739 "declaration specifiers"));
8740 else if (specs
->typespec_word
== cts_float
)
8742 ("both %<_Sat%> and %<float%> in "
8743 "declaration specifiers"));
8744 else if (specs
->typespec_word
== cts_double
)
8746 ("both %<_Sat%> and %<double%> in "
8747 "declaration specifiers"));
8748 else if (specs
->typespec_word
== cts_dfloat32
)
8750 ("both %<_Sat%> and %<_Decimal32%> in "
8751 "declaration specifiers"));
8752 else if (specs
->typespec_word
== cts_dfloat64
)
8754 ("both %<_Sat%> and %<_Decimal64%> in "
8755 "declaration specifiers"));
8756 else if (specs
->typespec_word
== cts_dfloat128
)
8758 ("both %<_Sat%> and %<_Decimal128%> in "
8759 "declaration specifiers"));
8760 else if (specs
->complex_p
)
8762 ("both %<_Sat%> and %<complex%> in "
8763 "declaration specifiers"));
8765 specs
->saturating_p
= true;
8772 error_at (loc
, "duplicate %qE", type
);
8778 /* "void", "_Bool", "char", "int", "float", "double", "_Decimal32",
8779 "_Decimal64", "_Decimal128", "_Fract" or "_Accum". */
8780 if (specs
->typespec_word
!= cts_none
)
8783 "two or more data types in declaration specifiers");
8791 ("both %<long%> and %<void%> in "
8792 "declaration specifiers"));
8793 else if (specs
->short_p
)
8795 ("both %<short%> and %<void%> in "
8796 "declaration specifiers"));
8797 else if (specs
->signed_p
)
8799 ("both %<signed%> and %<void%> in "
8800 "declaration specifiers"));
8801 else if (specs
->unsigned_p
)
8803 ("both %<unsigned%> and %<void%> in "
8804 "declaration specifiers"));
8805 else if (specs
->complex_p
)
8807 ("both %<complex%> and %<void%> in "
8808 "declaration specifiers"));
8809 else if (specs
->saturating_p
)
8811 ("both %<_Sat%> and %<void%> in "
8812 "declaration specifiers"));
8814 specs
->typespec_word
= cts_void
;
8819 ("both %<long%> and %<_Bool%> in "
8820 "declaration specifiers"));
8821 else if (specs
->short_p
)
8823 ("both %<short%> and %<_Bool%> in "
8824 "declaration specifiers"));
8825 else if (specs
->signed_p
)
8827 ("both %<signed%> and %<_Bool%> in "
8828 "declaration specifiers"));
8829 else if (specs
->unsigned_p
)
8831 ("both %<unsigned%> and %<_Bool%> in "
8832 "declaration specifiers"));
8833 else if (specs
->complex_p
)
8835 ("both %<complex%> and %<_Bool%> in "
8836 "declaration specifiers"));
8837 else if (specs
->saturating_p
)
8839 ("both %<_Sat%> and %<_Bool%> in "
8840 "declaration specifiers"));
8842 specs
->typespec_word
= cts_bool
;
8847 ("both %<long%> and %<char%> in "
8848 "declaration specifiers"));
8849 else if (specs
->short_p
)
8851 ("both %<short%> and %<char%> in "
8852 "declaration specifiers"));
8853 else if (specs
->saturating_p
)
8855 ("both %<_Sat%> and %<char%> in "
8856 "declaration specifiers"));
8858 specs
->typespec_word
= cts_char
;
8861 if (specs
->saturating_p
)
8863 ("both %<_Sat%> and %<int%> in "
8864 "declaration specifiers"));
8866 specs
->typespec_word
= cts_int
;
8871 ("both %<long%> and %<float%> in "
8872 "declaration specifiers"));
8873 else if (specs
->short_p
)
8875 ("both %<short%> and %<float%> in "
8876 "declaration specifiers"));
8877 else if (specs
->signed_p
)
8879 ("both %<signed%> and %<float%> in "
8880 "declaration specifiers"));
8881 else if (specs
->unsigned_p
)
8883 ("both %<unsigned%> and %<float%> in "
8884 "declaration specifiers"));
8885 else if (specs
->saturating_p
)
8887 ("both %<_Sat%> and %<float%> in "
8888 "declaration specifiers"));
8890 specs
->typespec_word
= cts_float
;
8893 if (specs
->long_long_p
)
8895 ("both %<long long%> and %<double%> in "
8896 "declaration specifiers"));
8897 else if (specs
->short_p
)
8899 ("both %<short%> and %<double%> in "
8900 "declaration specifiers"));
8901 else if (specs
->signed_p
)
8903 ("both %<signed%> and %<double%> in "
8904 "declaration specifiers"));
8905 else if (specs
->unsigned_p
)
8907 ("both %<unsigned%> and %<double%> in "
8908 "declaration specifiers"));
8909 else if (specs
->saturating_p
)
8911 ("both %<_Sat%> and %<double%> in "
8912 "declaration specifiers"));
8914 specs
->typespec_word
= cts_double
;
8921 if (i
== RID_DFLOAT32
)
8923 else if (i
== RID_DFLOAT64
)
8926 str
= "_Decimal128";
8927 if (specs
->long_long_p
)
8929 ("both %<long long%> and %<%s%> in "
8930 "declaration specifiers"),
8934 ("both %<long%> and %<%s%> in "
8935 "declaration specifiers"),
8937 else if (specs
->short_p
)
8939 ("both %<short%> and %<%s%> in "
8940 "declaration specifiers"),
8942 else if (specs
->signed_p
)
8944 ("both %<signed%> and %<%s%> in "
8945 "declaration specifiers"),
8947 else if (specs
->unsigned_p
)
8949 ("both %<unsigned%> and %<%s%> in "
8950 "declaration specifiers"),
8952 else if (specs
->complex_p
)
8954 ("both %<complex%> and %<%s%> in "
8955 "declaration specifiers"),
8957 else if (specs
->saturating_p
)
8959 ("both %<_Sat%> and %<%s%> in "
8960 "declaration specifiers"),
8962 else if (i
== RID_DFLOAT32
)
8963 specs
->typespec_word
= cts_dfloat32
;
8964 else if (i
== RID_DFLOAT64
)
8965 specs
->typespec_word
= cts_dfloat64
;
8967 specs
->typespec_word
= cts_dfloat128
;
8969 if (!targetm
.decimal_float_supported_p ())
8971 ("decimal floating point not supported "
8972 "for this target"));
8973 pedwarn (loc
, OPT_pedantic
,
8974 "ISO C does not support decimal floating point");
8984 if (specs
->complex_p
)
8986 ("both %<complex%> and %<%s%> in "
8987 "declaration specifiers"),
8989 else if (i
== RID_FRACT
)
8990 specs
->typespec_word
= cts_fract
;
8992 specs
->typespec_word
= cts_accum
;
8994 if (!targetm
.fixed_point_supported_p ())
8996 "fixed-point types not supported for this target");
8997 pedwarn (loc
, OPT_pedantic
,
8998 "ISO C does not support fixed-point types");
9001 /* ObjC reserved word "id", handled below. */
9007 /* Now we have a typedef (a TYPE_DECL node), an identifier (some
9008 form of ObjC type, cases such as "int" and "long" being handled
9009 above), a TYPE (struct, union, enum and typeof specifiers) or an
9010 ERROR_MARK. In none of these cases may there have previously
9011 been any type specifiers. */
9012 if (specs
->type
|| specs
->typespec_word
!= cts_none
9013 || specs
->long_p
|| specs
->short_p
|| specs
->signed_p
9014 || specs
->unsigned_p
|| specs
->complex_p
)
9015 error_at (loc
, "two or more data types in declaration specifiers");
9016 else if (TREE_CODE (type
) == TYPE_DECL
)
9018 if (TREE_TYPE (type
) == error_mark_node
)
9019 ; /* Allow the type to default to int to avoid cascading errors. */
9022 specs
->type
= TREE_TYPE (type
);
9023 specs
->decl_attr
= DECL_ATTRIBUTES (type
);
9024 specs
->typedef_p
= true;
9025 specs
->explicit_signed_p
= C_TYPEDEF_EXPLICITLY_SIGNED (type
);
9027 /* If this typedef name is defined in a struct, then a C++
9028 lookup would return a different value. */
9030 && I_SYMBOL_BINDING (DECL_NAME (type
))->in_struct
)
9031 warning_at (loc
, OPT_Wc___compat
,
9032 "C++ lookup of %qD would return a field, not a type",
9035 /* If we are parsing a struct, record that a struct field
9037 if (warn_cxx_compat
&& struct_parse_info
!= NULL
)
9038 VEC_safe_push (tree
, heap
, struct_parse_info
->typedefs_seen
, type
);
9041 else if (TREE_CODE (type
) == IDENTIFIER_NODE
)
9043 tree t
= lookup_name (type
);
9044 if (!t
|| TREE_CODE (t
) != TYPE_DECL
)
9045 error_at (loc
, "%qE fails to be a typedef or built in type", type
);
9046 else if (TREE_TYPE (t
) == error_mark_node
)
9049 specs
->type
= TREE_TYPE (t
);
9051 else if (TREE_CODE (type
) != ERROR_MARK
)
9053 if (spec
.kind
== ctsk_tagdef
|| spec
.kind
== ctsk_tagfirstref
)
9054 specs
->tag_defined_p
= true;
9055 if (spec
.kind
== ctsk_typeof
)
9057 specs
->typedef_p
= true;
9061 specs
->expr
= build2 (COMPOUND_EXPR
, TREE_TYPE (spec
.expr
),
9062 specs
->expr
, spec
.expr
);
9064 specs
->expr
= spec
.expr
;
9065 specs
->expr_const_operands
&= spec
.expr_const_operands
;
9074 /* Add the storage class specifier or function specifier SCSPEC to the
9075 declaration specifiers SPECS, returning SPECS. */
9077 struct c_declspecs
*
9078 declspecs_add_scspec (struct c_declspecs
*specs
, tree scspec
)
9081 enum c_storage_class n
= csc_none
;
9083 specs
->declspecs_seen_p
= true;
9084 gcc_assert (TREE_CODE (scspec
) == IDENTIFIER_NODE
9085 && C_IS_RESERVED_WORD (scspec
));
9086 i
= C_RID_CODE (scspec
);
9087 if (specs
->non_sc_seen_p
)
9088 warning (OPT_Wold_style_declaration
,
9089 "%qE is not at beginning of declaration", scspec
);
9093 /* C99 permits duplicate inline. Although of doubtful utility,
9094 it seems simplest to permit it in gnu89 mode as well, as
9095 there is also little utility in maintaining this as a
9096 difference between gnu89 and C99 inline. */
9098 specs
->inline_p
= true;
9101 dupe
= specs
->thread_p
;
9102 if (specs
->storage_class
== csc_auto
)
9103 error ("%<__thread%> used with %<auto%>");
9104 else if (specs
->storage_class
== csc_register
)
9105 error ("%<__thread%> used with %<register%>");
9106 else if (specs
->storage_class
== csc_typedef
)
9107 error ("%<__thread%> used with %<typedef%>");
9109 specs
->thread_p
= true;
9116 /* Diagnose "__thread extern". */
9117 if (specs
->thread_p
)
9118 error ("%<__thread%> before %<extern%>");
9125 /* Diagnose "__thread static". */
9126 if (specs
->thread_p
)
9127 error ("%<__thread%> before %<static%>");
9135 if (n
!= csc_none
&& n
== specs
->storage_class
)
9138 error ("duplicate %qE", scspec
);
9141 if (specs
->storage_class
!= csc_none
&& n
!= specs
->storage_class
)
9143 error ("multiple storage classes in declaration specifiers");
9147 specs
->storage_class
= n
;
9148 if (n
!= csc_extern
&& n
!= csc_static
&& specs
->thread_p
)
9150 error ("%<__thread%> used with %qE", scspec
);
9151 specs
->thread_p
= false;
9158 /* Add the attributes ATTRS to the declaration specifiers SPECS,
9161 struct c_declspecs
*
9162 declspecs_add_attrs (struct c_declspecs
*specs
, tree attrs
)
9164 specs
->attrs
= chainon (attrs
, specs
->attrs
);
9165 specs
->declspecs_seen_p
= true;
9169 /* Combine "long", "short", "signed", "unsigned" and "_Complex" type
9170 specifiers with any other type specifier to determine the resulting
9171 type. This is where ISO C checks on complex types are made, since
9172 "_Complex long" is a prefix of the valid ISO C type "_Complex long
9175 struct c_declspecs
*
9176 finish_declspecs (struct c_declspecs
*specs
)
9178 /* If a type was specified as a whole, we have no modifiers and are
9180 if (specs
->type
!= NULL_TREE
)
9182 gcc_assert (!specs
->long_p
&& !specs
->long_long_p
&& !specs
->short_p
9183 && !specs
->signed_p
&& !specs
->unsigned_p
9184 && !specs
->complex_p
);
9188 /* If none of "void", "_Bool", "char", "int", "float" or "double"
9189 has been specified, treat it as "int" unless "_Complex" is
9190 present and there are no other specifiers. If we just have
9191 "_Complex", it is equivalent to "_Complex double", but e.g.
9192 "_Complex short" is equivalent to "_Complex short int". */
9193 if (specs
->typespec_word
== cts_none
)
9195 if (specs
->saturating_p
)
9197 error ("%<_Sat%> is used without %<_Fract%> or %<_Accum%>");
9198 if (!targetm
.fixed_point_supported_p ())
9199 error ("fixed-point types not supported for this target");
9200 specs
->typespec_word
= cts_fract
;
9202 else if (specs
->long_p
|| specs
->short_p
9203 || specs
->signed_p
|| specs
->unsigned_p
)
9205 specs
->typespec_word
= cts_int
;
9207 else if (specs
->complex_p
)
9209 specs
->typespec_word
= cts_double
;
9210 pedwarn (input_location
, OPT_pedantic
,
9211 "ISO C does not support plain %<complex%> meaning "
9212 "%<double complex%>");
9216 specs
->typespec_word
= cts_int
;
9217 specs
->default_int_p
= true;
9218 /* We don't diagnose this here because grokdeclarator will
9219 give more specific diagnostics according to whether it is
9220 a function definition. */
9224 /* If "signed" was specified, record this to distinguish "int" and
9225 "signed int" in the case of a bit-field with
9226 -funsigned-bitfields. */
9227 specs
->explicit_signed_p
= specs
->signed_p
;
9229 /* Now compute the actual type. */
9230 switch (specs
->typespec_word
)
9233 gcc_assert (!specs
->long_p
&& !specs
->short_p
9234 && !specs
->signed_p
&& !specs
->unsigned_p
9235 && !specs
->complex_p
);
9236 specs
->type
= void_type_node
;
9239 gcc_assert (!specs
->long_p
&& !specs
->short_p
9240 && !specs
->signed_p
&& !specs
->unsigned_p
9241 && !specs
->complex_p
);
9242 specs
->type
= boolean_type_node
;
9245 gcc_assert (!specs
->long_p
&& !specs
->short_p
);
9246 gcc_assert (!(specs
->signed_p
&& specs
->unsigned_p
));
9247 if (specs
->signed_p
)
9248 specs
->type
= signed_char_type_node
;
9249 else if (specs
->unsigned_p
)
9250 specs
->type
= unsigned_char_type_node
;
9252 specs
->type
= char_type_node
;
9253 if (specs
->complex_p
)
9255 pedwarn (input_location
, OPT_pedantic
,
9256 "ISO C does not support complex integer types");
9257 specs
->type
= build_complex_type (specs
->type
);
9261 gcc_assert (!(specs
->long_p
&& specs
->short_p
));
9262 gcc_assert (!(specs
->signed_p
&& specs
->unsigned_p
));
9263 if (specs
->long_long_p
)
9264 specs
->type
= (specs
->unsigned_p
9265 ? long_long_unsigned_type_node
9266 : long_long_integer_type_node
);
9267 else if (specs
->long_p
)
9268 specs
->type
= (specs
->unsigned_p
9269 ? long_unsigned_type_node
9270 : long_integer_type_node
);
9271 else if (specs
->short_p
)
9272 specs
->type
= (specs
->unsigned_p
9273 ? short_unsigned_type_node
9274 : short_integer_type_node
);
9276 specs
->type
= (specs
->unsigned_p
9277 ? unsigned_type_node
9278 : integer_type_node
);
9279 if (specs
->complex_p
)
9281 pedwarn (input_location
, OPT_pedantic
,
9282 "ISO C does not support complex integer types");
9283 specs
->type
= build_complex_type (specs
->type
);
9287 gcc_assert (!specs
->long_p
&& !specs
->short_p
9288 && !specs
->signed_p
&& !specs
->unsigned_p
);
9289 specs
->type
= (specs
->complex_p
9290 ? complex_float_type_node
9294 gcc_assert (!specs
->long_long_p
&& !specs
->short_p
9295 && !specs
->signed_p
&& !specs
->unsigned_p
);
9298 specs
->type
= (specs
->complex_p
9299 ? complex_long_double_type_node
9300 : long_double_type_node
);
9304 specs
->type
= (specs
->complex_p
9305 ? complex_double_type_node
9306 : double_type_node
);
9312 gcc_assert (!specs
->long_p
&& !specs
->long_long_p
&& !specs
->short_p
9313 && !specs
->signed_p
&& !specs
->unsigned_p
&& !specs
->complex_p
);
9314 if (specs
->typespec_word
== cts_dfloat32
)
9315 specs
->type
= dfloat32_type_node
;
9316 else if (specs
->typespec_word
== cts_dfloat64
)
9317 specs
->type
= dfloat64_type_node
;
9319 specs
->type
= dfloat128_type_node
;
9322 gcc_assert (!specs
->complex_p
);
9323 if (!targetm
.fixed_point_supported_p ())
9324 specs
->type
= integer_type_node
;
9325 else if (specs
->saturating_p
)
9327 if (specs
->long_long_p
)
9328 specs
->type
= specs
->unsigned_p
9329 ? sat_unsigned_long_long_fract_type_node
9330 : sat_long_long_fract_type_node
;
9331 else if (specs
->long_p
)
9332 specs
->type
= specs
->unsigned_p
9333 ? sat_unsigned_long_fract_type_node
9334 : sat_long_fract_type_node
;
9335 else if (specs
->short_p
)
9336 specs
->type
= specs
->unsigned_p
9337 ? sat_unsigned_short_fract_type_node
9338 : sat_short_fract_type_node
;
9340 specs
->type
= specs
->unsigned_p
9341 ? sat_unsigned_fract_type_node
9342 : sat_fract_type_node
;
9346 if (specs
->long_long_p
)
9347 specs
->type
= specs
->unsigned_p
9348 ? unsigned_long_long_fract_type_node
9349 : long_long_fract_type_node
;
9350 else if (specs
->long_p
)
9351 specs
->type
= specs
->unsigned_p
9352 ? unsigned_long_fract_type_node
9353 : long_fract_type_node
;
9354 else if (specs
->short_p
)
9355 specs
->type
= specs
->unsigned_p
9356 ? unsigned_short_fract_type_node
9357 : short_fract_type_node
;
9359 specs
->type
= specs
->unsigned_p
9360 ? unsigned_fract_type_node
9365 gcc_assert (!specs
->complex_p
);
9366 if (!targetm
.fixed_point_supported_p ())
9367 specs
->type
= integer_type_node
;
9368 else if (specs
->saturating_p
)
9370 if (specs
->long_long_p
)
9371 specs
->type
= specs
->unsigned_p
9372 ? sat_unsigned_long_long_accum_type_node
9373 : sat_long_long_accum_type_node
;
9374 else if (specs
->long_p
)
9375 specs
->type
= specs
->unsigned_p
9376 ? sat_unsigned_long_accum_type_node
9377 : sat_long_accum_type_node
;
9378 else if (specs
->short_p
)
9379 specs
->type
= specs
->unsigned_p
9380 ? sat_unsigned_short_accum_type_node
9381 : sat_short_accum_type_node
;
9383 specs
->type
= specs
->unsigned_p
9384 ? sat_unsigned_accum_type_node
9385 : sat_accum_type_node
;
9389 if (specs
->long_long_p
)
9390 specs
->type
= specs
->unsigned_p
9391 ? unsigned_long_long_accum_type_node
9392 : long_long_accum_type_node
;
9393 else if (specs
->long_p
)
9394 specs
->type
= specs
->unsigned_p
9395 ? unsigned_long_accum_type_node
9396 : long_accum_type_node
;
9397 else if (specs
->short_p
)
9398 specs
->type
= specs
->unsigned_p
9399 ? unsigned_short_accum_type_node
9400 : short_accum_type_node
;
9402 specs
->type
= specs
->unsigned_p
9403 ? unsigned_accum_type_node
9414 /* A subroutine of c_write_global_declarations. Perform final processing
9415 on one file scope's declarations (or the external scope's declarations),
9419 c_write_global_declarations_1 (tree globals
)
9424 /* Process the decls in the order they were written. */
9425 for (decl
= globals
; decl
; decl
= TREE_CHAIN (decl
))
9427 /* Check for used but undefined static functions using the C
9428 standard's definition of "used", and set TREE_NO_WARNING so
9429 that check_global_declarations doesn't repeat the check. */
9430 if (TREE_CODE (decl
) == FUNCTION_DECL
9431 && DECL_INITIAL (decl
) == 0
9432 && DECL_EXTERNAL (decl
)
9433 && !TREE_PUBLIC (decl
)
9434 && C_DECL_USED (decl
))
9436 pedwarn (input_location
, 0, "%q+F used but never defined", decl
);
9437 TREE_NO_WARNING (decl
) = 1;
9440 wrapup_global_declaration_1 (decl
);
9446 for (decl
= globals
; decl
; decl
= TREE_CHAIN (decl
))
9447 reconsider
|= wrapup_global_declaration_2 (decl
);
9451 for (decl
= globals
; decl
; decl
= TREE_CHAIN (decl
))
9452 check_global_declaration_1 (decl
);
9455 /* A subroutine of c_write_global_declarations Emit debug information for each
9456 of the declarations in GLOBALS. */
9459 c_write_global_declarations_2 (tree globals
)
9463 for (decl
= globals
; decl
; decl
= TREE_CHAIN (decl
))
9464 debug_hooks
->global_decl (decl
);
9467 /* Preserve the external declarations scope across a garbage collect. */
9468 static GTY(()) tree ext_block
;
9471 c_write_global_declarations (void)
9475 /* We don't want to do this if generating a PCH. */
9479 /* Don't waste time on further processing if -fsyntax-only.
9480 Continue for warning and errors issued during lowering though. */
9481 if (flag_syntax_only
)
9484 /* Close the external scope. */
9485 ext_block
= pop_scope ();
9487 gcc_assert (!current_scope
);
9491 tree tmp
= BLOCK_VARS (ext_block
);
9493 FILE * stream
= dump_begin (TDI_tu
, &flags
);
9496 dump_node (tmp
, flags
& ~TDF_SLIM
, stream
);
9497 dump_end (TDI_tu
, stream
);
9501 /* Process all file scopes in this compilation, and the external_scope,
9502 through wrapup_global_declarations and check_global_declarations. */
9503 for (t
= all_translation_units
; t
; t
= TREE_CHAIN (t
))
9504 c_write_global_declarations_1 (BLOCK_VARS (DECL_INITIAL (t
)));
9505 c_write_global_declarations_1 (BLOCK_VARS (ext_block
));
9507 /* We're done parsing; proceed to optimize and emit assembly.
9508 FIXME: shouldn't be the front end's responsibility to call this. */
9509 cgraph_finalize_compilation_unit ();
9511 /* After cgraph has had a chance to emit everything that's going to
9512 be emitted, output debug information for globals. */
9513 if (errorcount
== 0 && sorrycount
== 0)
9515 timevar_push (TV_SYMOUT
);
9516 for (t
= all_translation_units
; t
; t
= TREE_CHAIN (t
))
9517 c_write_global_declarations_2 (BLOCK_VARS (DECL_INITIAL (t
)));
9518 c_write_global_declarations_2 (BLOCK_VARS (ext_block
));
9519 timevar_pop (TV_SYMOUT
);
9525 #include "gt-c-decl.h"