1 /* Process declarations and variables for C compiler.
2 Copyright (C) 1988-2014 Free Software Foundation, Inc.
4 This file is part of GCC.
6 GCC is free software; you can redistribute it and/or modify it under
7 the terms of the GNU General Public License as published by the Free
8 Software Foundation; either version 3, or (at your option) any later
11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 You should have received a copy of the GNU General Public License
17 along with GCC; see the file COPYING3. If not see
18 <http://www.gnu.org/licenses/>. */
20 /* Process declarations and symbol lookup for C front end.
21 Also constructs types; the standard scalar types at initialization,
22 and structure, union, array and enum types when they are declared. */
24 /* ??? not all decl nodes are given the most useful possible
25 line numbers. For example, the CONST_DECLs for enum values. */
29 #include "coretypes.h"
34 #include "print-tree.h"
35 #include "stor-layout.h"
38 #include "stringpool.h"
39 #include "tree-inline.h"
50 #include "c-family/c-common.h"
51 #include "c-family/c-objc.h"
52 #include "c-family/c-pragma.h"
53 #include "c-family/c-ubsan.h"
55 #include "langhooks.h"
56 #include "tree-iterator.h"
57 #include "diagnostic-core.h"
60 #include "hash-table.h"
61 #include "langhooks-def.h"
62 #include "pointer-set.h"
64 #include "c-family/c-ada-spec.h"
68 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
70 { NORMAL
, /* Ordinary declaration */
71 FUNCDEF
, /* Function definition */
72 PARM
, /* Declaration of parm before function body */
73 FIELD
, /* Declaration inside struct or union */
74 TYPENAME
}; /* Typename (inside cast or sizeof) */
76 /* States indicating how grokdeclarator() should handle declspecs marked
77 with __attribute__((deprecated)). An object declared as
78 __attribute__((deprecated)) suppresses warnings of uses of other
81 enum deprecated_states
{
87 /* Nonzero if we have seen an invalid cross reference
88 to a struct, union, or enum, but not yet printed the message. */
89 tree pending_invalid_xref
;
91 /* File and line to appear in the eventual error message. */
92 location_t pending_invalid_xref_location
;
94 /* The file and line that the prototype came from if this is an
95 old-style definition; used for diagnostics in
96 store_parm_decls_oldstyle. */
98 static location_t current_function_prototype_locus
;
100 /* Whether this prototype was built-in. */
102 static bool current_function_prototype_built_in
;
104 /* The argument type information of this prototype. */
106 static tree current_function_prototype_arg_types
;
108 /* The argument information structure for the function currently being
111 static struct c_arg_info
*current_function_arg_info
;
113 /* The obstack on which parser and related data structures, which are
114 not live beyond their top-level declaration or definition, are
116 struct obstack parser_obstack
;
118 /* The current statement tree. */
120 static GTY(()) struct stmt_tree_s c_stmt_tree
;
122 /* State saving variables. */
126 /* A list of decls to be made automatically visible in each file scope. */
127 static GTY(()) tree visible_builtins
;
129 /* Set to 0 at beginning of a function definition, set to 1 if
130 a return statement that specifies a return value is seen. */
132 int current_function_returns_value
;
134 /* Set to 0 at beginning of a function definition, set to 1 if
135 a return statement with no argument is seen. */
137 int current_function_returns_null
;
139 /* Set to 0 at beginning of a function definition, set to 1 if
140 a call to a noreturn function is seen. */
142 int current_function_returns_abnormally
;
144 /* Set to nonzero by `grokdeclarator' for a function
145 whose return type is defaulted, if warnings for this are desired. */
147 static int warn_about_return_type
;
149 /* Nonzero when the current toplevel function contains a declaration
150 of a nested function which is never defined. */
152 static bool undef_nested_function
;
154 /* Mode used to build pointers (VOIDmode means ptr_mode). */
156 enum machine_mode c_default_pointer_mode
= VOIDmode
;
158 /* If non-zero, implicit "omp declare target" attribute is added into the
160 int current_omp_declare_target_attribute
;
162 /* Each c_binding structure describes one binding of an identifier to
163 a decl. All the decls in a scope - irrespective of namespace - are
164 chained together by the ->prev field, which (as the name implies)
165 runs in reverse order. All the decls in a given namespace bound to
166 a given identifier are chained by the ->shadowed field, which runs
167 from inner to outer scopes.
169 The ->decl field usually points to a DECL node, but there are two
170 exceptions. In the namespace of type tags, the bound entity is a
171 RECORD_TYPE, UNION_TYPE, or ENUMERAL_TYPE node. If an undeclared
172 identifier is encountered, it is bound to error_mark_node to
173 suppress further errors about that identifier in the current
176 The ->u.type field stores the type of the declaration in this scope;
177 if NULL, the type is the type of the ->decl field. This is only of
178 relevance for objects with external or internal linkage which may
179 be redeclared in inner scopes, forming composite types that only
180 persist for the duration of those scopes. In the external scope,
181 this stores the composite of all the types declared for this
182 object, visible or not. The ->inner_comp field (used only at file
183 scope) stores whether an incomplete array type at file scope was
184 completed at an inner scope to an array size other than 1.
186 The ->u.label field is used for labels. It points to a structure
187 which stores additional information used for warnings.
189 The depth field is copied from the scope structure that holds this
190 decl. It is used to preserve the proper ordering of the ->shadowed
191 field (see bind()) and also for a handful of special-case checks.
192 Finally, the invisible bit is true for a decl which should be
193 ignored for purposes of normal name lookup, and the nested bit is
194 true for a decl that's been bound a second time in an inner scope;
195 in all such cases, the binding in the outer scope will have its
196 invisible bit true. */
198 struct GTY((chain_next ("%h.prev"))) c_binding
{
199 union GTY(()) { /* first so GTY desc can use decl */
200 tree
GTY((tag ("0"))) type
; /* the type in this scope */
201 struct c_label_vars
* GTY((tag ("1"))) label
; /* for warnings */
202 } GTY((desc ("TREE_CODE (%0.decl) == LABEL_DECL"))) u
;
203 tree decl
; /* the decl bound */
204 tree id
; /* the identifier it's bound to */
205 struct c_binding
*prev
; /* the previous decl in this scope */
206 struct c_binding
*shadowed
; /* the innermost decl shadowed by this one */
207 unsigned int depth
: 28; /* depth of this scope */
208 BOOL_BITFIELD invisible
: 1; /* normal lookup should ignore this binding */
209 BOOL_BITFIELD nested
: 1; /* do not set DECL_CONTEXT when popping */
210 BOOL_BITFIELD inner_comp
: 1; /* incomplete array completed in inner scope */
211 BOOL_BITFIELD in_struct
: 1; /* currently defined as struct field */
212 location_t locus
; /* location for nested bindings */
214 #define B_IN_SCOPE(b1, b2) ((b1)->depth == (b2)->depth)
215 #define B_IN_CURRENT_SCOPE(b) ((b)->depth == current_scope->depth)
216 #define B_IN_FILE_SCOPE(b) ((b)->depth == 1 /*file_scope->depth*/)
217 #define B_IN_EXTERNAL_SCOPE(b) ((b)->depth == 0 /*external_scope->depth*/)
219 #define I_SYMBOL_BINDING(node) \
220 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->symbol_binding)
221 #define I_SYMBOL_DECL(node) \
222 (I_SYMBOL_BINDING(node) ? I_SYMBOL_BINDING(node)->decl : 0)
224 #define I_TAG_BINDING(node) \
225 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->tag_binding)
226 #define I_TAG_DECL(node) \
227 (I_TAG_BINDING(node) ? I_TAG_BINDING(node)->decl : 0)
229 #define I_LABEL_BINDING(node) \
230 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->label_binding)
231 #define I_LABEL_DECL(node) \
232 (I_LABEL_BINDING(node) ? I_LABEL_BINDING(node)->decl : 0)
234 /* Each C symbol points to three linked lists of c_binding structures.
235 These describe the values of the identifier in the three different
236 namespaces defined by the language. */
238 struct GTY(()) lang_identifier
{
239 struct c_common_identifier common_id
;
240 struct c_binding
*symbol_binding
; /* vars, funcs, constants, typedefs */
241 struct c_binding
*tag_binding
; /* struct/union/enum tags */
242 struct c_binding
*label_binding
; /* labels */
245 /* Validate c-lang.c's assumptions. */
246 extern char C_SIZEOF_STRUCT_LANG_IDENTIFIER_isnt_accurate
247 [(sizeof(struct lang_identifier
) == C_SIZEOF_STRUCT_LANG_IDENTIFIER
) ? 1 : -1];
249 /* The resulting tree type. */
251 union GTY((desc ("TREE_CODE (&%h.generic) == IDENTIFIER_NODE"),
252 chain_next ("(union lang_tree_node *) c_tree_chain_next (&%h.generic)"))) lang_tree_node
254 union tree_node
GTY ((tag ("0"),
255 desc ("tree_node_structure (&%h)")))
257 struct lang_identifier
GTY ((tag ("1"))) identifier
;
260 /* Track bindings and other things that matter for goto warnings. For
261 efficiency, we do not gather all the decls at the point of
262 definition. Instead, we point into the bindings structure. As
263 scopes are popped, we update these structures and gather the decls
264 that matter at that time. */
266 struct GTY(()) c_spot_bindings
{
267 /* The currently open scope which holds bindings defined when the
268 label was defined or the goto statement was found. */
269 struct c_scope
*scope
;
270 /* The bindings in the scope field which were defined at the point
271 of the label or goto. This lets us look at older or newer
272 bindings in the scope, as appropriate. */
273 struct c_binding
*bindings_in_scope
;
274 /* The number of statement expressions that have started since this
275 label or goto statement was defined. This is zero if we are at
276 the same statement expression level. It is positive if we are in
277 a statement expression started since this spot. It is negative
278 if this spot was in a statement expression and we have left
281 /* Whether we started in a statement expression but are no longer in
282 it. This is set to true if stmt_exprs ever goes negative. */
286 /* This structure is used to keep track of bindings seen when a goto
287 statement is defined. This is only used if we see the goto
288 statement before we see the label. */
290 struct GTY(()) c_goto_bindings
{
291 /* The location of the goto statement. */
293 /* The bindings of the goto statement. */
294 struct c_spot_bindings goto_bindings
;
297 typedef struct c_goto_bindings
*c_goto_bindings_p
;
299 /* The additional information we keep track of for a label binding.
300 These fields are updated as scopes are popped. */
302 struct GTY(()) c_label_vars
{
303 /* The shadowed c_label_vars, when one label shadows another (which
304 can only happen using a __label__ declaration). */
305 struct c_label_vars
*shadowed
;
306 /* The bindings when the label was defined. */
307 struct c_spot_bindings label_bindings
;
308 /* A list of decls that we care about: decls about which we should
309 warn if a goto branches to this label from later in the function.
310 Decls are added to this list as scopes are popped. We only add
311 the decls that matter. */
312 vec
<tree
, va_gc
> *decls_in_scope
;
313 /* A list of goto statements to this label. This is only used for
314 goto statements seen before the label was defined, so that we can
315 issue appropriate warnings for them. */
316 vec
<c_goto_bindings_p
, va_gc
> *gotos
;
319 /* Each c_scope structure describes the complete contents of one
320 scope. Four scopes are distinguished specially: the innermost or
321 current scope, the innermost function scope, the file scope (always
322 the second to outermost) and the outermost or external scope.
324 Most declarations are recorded in the current scope.
326 All normal label declarations are recorded in the innermost
327 function scope, as are bindings of undeclared identifiers to
328 error_mark_node. (GCC permits nested functions as an extension,
329 hence the 'innermost' qualifier.) Explicitly declared labels
330 (using the __label__ extension) appear in the current scope.
332 Being in the file scope (current_scope == file_scope) causes
333 special behavior in several places below. Also, under some
334 conditions the Objective-C front end records declarations in the
335 file scope even though that isn't the current scope.
337 All declarations with external linkage are recorded in the external
338 scope, even if they aren't visible there; this models the fact that
339 such declarations are visible to the entire program, and (with a
340 bit of cleverness, see pushdecl) allows diagnosis of some violations
341 of C99 6.2.2p7 and 6.2.7p2:
343 If, within the same translation unit, the same identifier appears
344 with both internal and external linkage, the behavior is
347 All declarations that refer to the same object or function shall
348 have compatible type; otherwise, the behavior is undefined.
350 Initially only the built-in declarations, which describe compiler
351 intrinsic functions plus a subset of the standard library, are in
354 The order of the blocks list matters, and it is frequently appended
355 to. To avoid having to walk all the way to the end of the list on
356 each insertion, or reverse the list later, we maintain a pointer to
357 the last list entry. (FIXME: It should be feasible to use a reversed
360 The bindings list is strictly in reverse order of declarations;
361 pop_scope relies on this. */
364 struct GTY((chain_next ("%h.outer"))) c_scope
{
365 /* The scope containing this one. */
366 struct c_scope
*outer
;
368 /* The next outermost function scope. */
369 struct c_scope
*outer_function
;
371 /* All bindings in this scope. */
372 struct c_binding
*bindings
;
374 /* For each scope (except the global one), a chain of BLOCK nodes
375 for all the scopes that were entered and exited one level down. */
379 /* The depth of this scope. Used to keep the ->shadowed chain of
380 bindings sorted innermost to outermost. */
381 unsigned int depth
: 28;
383 /* True if we are currently filling this scope with parameter
385 BOOL_BITFIELD parm_flag
: 1;
387 /* True if we saw [*] in this scope. Used to give an error messages
388 if these appears in a function definition. */
389 BOOL_BITFIELD had_vla_unspec
: 1;
391 /* True if we already complained about forward parameter decls
392 in this scope. This prevents double warnings on
393 foo (int a; int b; ...) */
394 BOOL_BITFIELD warned_forward_parm_decls
: 1;
396 /* True if this is the outermost block scope of a function body.
397 This scope contains the parameters, the local variables declared
398 in the outermost block, and all the labels (except those in
399 nested functions, or declared at block scope with __label__). */
400 BOOL_BITFIELD function_body
: 1;
402 /* True means make a BLOCK for this scope no matter what. */
403 BOOL_BITFIELD keep
: 1;
405 /* True means that an unsuffixed float constant is _Decimal64. */
406 BOOL_BITFIELD float_const_decimal64
: 1;
408 /* True if this scope has any label bindings. This is used to speed
409 up searching for labels when popping scopes, particularly since
410 labels are normally only found at function scope. */
411 BOOL_BITFIELD has_label_bindings
: 1;
413 /* True if we should issue a warning if a goto statement crosses any
414 of the bindings. We still need to check the list of bindings to
415 find the specific ones we need to warn about. This is true if
416 decl_jump_unsafe would return true for any of the bindings. This
417 is used to avoid looping over all the bindings unnecessarily. */
418 BOOL_BITFIELD has_jump_unsafe_decl
: 1;
421 /* The scope currently in effect. */
423 static GTY(()) struct c_scope
*current_scope
;
425 /* The innermost function scope. Ordinary (not explicitly declared)
426 labels, bindings to error_mark_node, and the lazily-created
427 bindings of __func__ and its friends get this scope. */
429 static GTY(()) struct c_scope
*current_function_scope
;
431 /* The C file scope. This is reset for each input translation unit. */
433 static GTY(()) struct c_scope
*file_scope
;
435 /* The outermost scope. This is used for all declarations with
436 external linkage, and only these, hence the name. */
438 static GTY(()) struct c_scope
*external_scope
;
440 /* A chain of c_scope structures awaiting reuse. */
442 static GTY((deletable
)) struct c_scope
*scope_freelist
;
444 /* A chain of c_binding structures awaiting reuse. */
446 static GTY((deletable
)) struct c_binding
*binding_freelist
;
448 /* Append VAR to LIST in scope SCOPE. */
449 #define SCOPE_LIST_APPEND(scope, list, decl) do { \
450 struct c_scope *s_ = (scope); \
452 if (s_->list##_last) \
453 BLOCK_CHAIN (s_->list##_last) = d_; \
456 s_->list##_last = d_; \
459 /* Concatenate FROM in scope FSCOPE onto TO in scope TSCOPE. */
460 #define SCOPE_LIST_CONCAT(tscope, to, fscope, from) do { \
461 struct c_scope *t_ = (tscope); \
462 struct c_scope *f_ = (fscope); \
464 BLOCK_CHAIN (t_->to##_last) = f_->from; \
467 t_->to##_last = f_->from##_last; \
470 /* A c_inline_static structure stores details of a static identifier
471 referenced in a definition of a function that may be an inline
472 definition if no subsequent declaration of that function uses
473 "extern" or does not use "inline". */
475 struct GTY((chain_next ("%h.next"))) c_inline_static
{
476 /* The location for a diagnostic. */
479 /* The function that may be an inline definition. */
482 /* The object or function referenced. */
485 /* What sort of reference this is. */
486 enum c_inline_static_type type
;
488 /* The next such structure or NULL. */
489 struct c_inline_static
*next
;
492 /* List of static identifiers used or referenced in functions that may
493 be inline definitions. */
494 static GTY(()) struct c_inline_static
*c_inline_statics
;
496 /* True means unconditionally make a BLOCK for the next scope pushed. */
498 static bool keep_next_level_flag
;
500 /* True means the next call to push_scope will be the outermost scope
501 of a function body, so do not push a new scope, merely cease
502 expecting parameter decls. */
504 static bool next_is_function_body
;
506 /* A vector of pointers to c_binding structures. */
508 typedef struct c_binding
*c_binding_ptr
;
510 /* Information that we keep for a struct or union while it is being
513 struct c_struct_parse_info
515 /* If warn_cxx_compat, a list of types defined within this
517 vec
<tree
> struct_types
;
518 /* If warn_cxx_compat, a list of field names which have bindings,
519 and which are defined in this struct, but which are not defined
520 in any enclosing struct. This is used to clear the in_struct
521 field of the c_bindings structure. */
522 vec
<c_binding_ptr
> fields
;
523 /* If warn_cxx_compat, a list of typedef names used when defining
524 fields in this struct. */
525 vec
<tree
> typedefs_seen
;
528 /* Information for the struct or union currently being parsed, or
529 NULL if not parsing a struct or union. */
530 static struct c_struct_parse_info
*struct_parse_info
;
532 /* Forward declarations. */
533 static tree
lookup_name_in_scope (tree
, struct c_scope
*);
534 static tree
c_make_fname_decl (location_t
, tree
, int);
535 static tree
grokdeclarator (const struct c_declarator
*,
536 struct c_declspecs
*,
537 enum decl_context
, bool, tree
*, tree
*, tree
*,
538 bool *, enum deprecated_states
);
539 static tree
grokparms (struct c_arg_info
*, bool);
540 static void layout_array_type (tree
);
542 /* T is a statement. Add it to the statement-tree. This is the
543 C/ObjC version--C++ has a slightly different version of this
549 enum tree_code code
= TREE_CODE (t
);
551 if (CAN_HAVE_LOCATION_P (t
) && code
!= LABEL_EXPR
)
553 if (!EXPR_HAS_LOCATION (t
))
554 SET_EXPR_LOCATION (t
, input_location
);
557 if (code
== LABEL_EXPR
|| code
== CASE_LABEL_EXPR
)
558 STATEMENT_LIST_HAS_LABEL (cur_stmt_list
) = 1;
560 /* Add T to the statement-tree. Non-side-effect statements need to be
561 recorded during statement expressions. */
562 if (!building_stmt_list_p ())
564 append_to_statement_list_force (t
, &cur_stmt_list
);
569 /* Build a pointer type using the default pointer mode. */
572 c_build_pointer_type (tree to_type
)
574 addr_space_t as
= to_type
== error_mark_node
? ADDR_SPACE_GENERIC
575 : TYPE_ADDR_SPACE (to_type
);
576 enum machine_mode pointer_mode
;
578 if (as
!= ADDR_SPACE_GENERIC
|| c_default_pointer_mode
== VOIDmode
)
579 pointer_mode
= targetm
.addr_space
.pointer_mode (as
);
581 pointer_mode
= c_default_pointer_mode
;
582 return build_pointer_type_for_mode (to_type
, pointer_mode
, false);
586 /* Return true if we will want to say something if a goto statement
590 decl_jump_unsafe (tree decl
)
592 if (error_operand_p (decl
))
595 /* Always warn about crossing variably modified types. */
596 if ((TREE_CODE (decl
) == VAR_DECL
|| TREE_CODE (decl
) == TYPE_DECL
)
597 && variably_modified_type_p (TREE_TYPE (decl
), NULL_TREE
))
600 /* Otherwise, only warn if -Wgoto-misses-init and this is an
601 initialized automatic decl. */
602 if (warn_jump_misses_init
603 && TREE_CODE (decl
) == VAR_DECL
604 && !TREE_STATIC (decl
)
605 && DECL_INITIAL (decl
) != NULL_TREE
)
613 c_print_identifier (FILE *file
, tree node
, int indent
)
615 print_node (file
, "symbol", I_SYMBOL_DECL (node
), indent
+ 4);
616 print_node (file
, "tag", I_TAG_DECL (node
), indent
+ 4);
617 print_node (file
, "label", I_LABEL_DECL (node
), indent
+ 4);
618 if (C_IS_RESERVED_WORD (node
) && C_RID_CODE (node
) != RID_CXX_COMPAT_WARN
)
620 tree rid
= ridpointers
[C_RID_CODE (node
)];
621 indent_to (file
, indent
+ 4);
622 fprintf (file
, "rid " HOST_PTR_PRINTF
" \"%s\"",
623 (void *) rid
, IDENTIFIER_POINTER (rid
));
627 /* Establish a binding between NAME, an IDENTIFIER_NODE, and DECL,
628 which may be any of several kinds of DECL or TYPE or error_mark_node,
629 in the scope SCOPE. */
631 bind (tree name
, tree decl
, struct c_scope
*scope
, bool invisible
,
632 bool nested
, location_t locus
)
634 struct c_binding
*b
, **here
;
636 if (binding_freelist
)
638 b
= binding_freelist
;
639 binding_freelist
= b
->prev
;
642 b
= ggc_alloc
<c_binding
> ();
647 b
->depth
= scope
->depth
;
648 b
->invisible
= invisible
;
656 b
->prev
= scope
->bindings
;
659 if (decl_jump_unsafe (decl
))
660 scope
->has_jump_unsafe_decl
= 1;
665 switch (TREE_CODE (decl
))
667 case LABEL_DECL
: here
= &I_LABEL_BINDING (name
); break;
670 case RECORD_TYPE
: here
= &I_TAG_BINDING (name
); break;
676 case ERROR_MARK
: here
= &I_SYMBOL_BINDING (name
); break;
682 /* Locate the appropriate place in the chain of shadowed decls
683 to insert this binding. Normally, scope == current_scope and
684 this does nothing. */
685 while (*here
&& (*here
)->depth
> scope
->depth
)
686 here
= &(*here
)->shadowed
;
692 /* Clear the binding structure B, stick it on the binding_freelist,
693 and return the former value of b->prev. This is used by pop_scope
694 and get_parm_info to iterate destructively over all the bindings
695 from a given scope. */
696 static struct c_binding
*
697 free_binding_and_advance (struct c_binding
*b
)
699 struct c_binding
*prev
= b
->prev
;
701 memset (b
, 0, sizeof (struct c_binding
));
702 b
->prev
= binding_freelist
;
703 binding_freelist
= b
;
708 /* Bind a label. Like bind, but skip fields which aren't used for
709 labels, and add the LABEL_VARS value. */
711 bind_label (tree name
, tree label
, struct c_scope
*scope
,
712 struct c_label_vars
*label_vars
)
716 bind (name
, label
, scope
, /*invisible=*/false, /*nested=*/false,
719 scope
->has_label_bindings
= true;
722 gcc_assert (b
->decl
== label
);
723 label_vars
->shadowed
= b
->u
.label
;
724 b
->u
.label
= label_vars
;
727 /* Hook called at end of compilation to assume 1 elt
728 for a file-scope tentative array defn that wasn't complete before. */
731 c_finish_incomplete_decl (tree decl
)
733 if (TREE_CODE (decl
) == VAR_DECL
)
735 tree type
= TREE_TYPE (decl
);
736 if (type
!= error_mark_node
737 && TREE_CODE (type
) == ARRAY_TYPE
738 && !DECL_EXTERNAL (decl
)
739 && TYPE_DOMAIN (type
) == 0)
741 warning_at (DECL_SOURCE_LOCATION (decl
),
742 0, "array %q+D assumed to have one element", decl
);
744 complete_array_type (&TREE_TYPE (decl
), NULL_TREE
, true);
746 relayout_decl (decl
);
751 /* Record that inline function FUNC contains a reference (location
752 LOC) to static DECL (file-scope or function-local according to
756 record_inline_static (location_t loc
, tree func
, tree decl
,
757 enum c_inline_static_type type
)
759 c_inline_static
*csi
= ggc_alloc
<c_inline_static
> ();
761 csi
->function
= func
;
762 csi
->static_decl
= decl
;
764 csi
->next
= c_inline_statics
;
765 c_inline_statics
= csi
;
768 /* Check for references to static declarations in inline functions at
769 the end of the translation unit and diagnose them if the functions
770 are still inline definitions. */
773 check_inline_statics (void)
775 struct c_inline_static
*csi
;
776 for (csi
= c_inline_statics
; csi
; csi
= csi
->next
)
778 if (DECL_EXTERNAL (csi
->function
))
782 pedwarn (csi
->location
, 0,
783 "%qD is static but used in inline function %qD "
784 "which is not static", csi
->static_decl
, csi
->function
);
787 pedwarn (csi
->location
, 0,
788 "%q+D is static but declared in inline function %qD "
789 "which is not static", csi
->static_decl
, csi
->function
);
795 c_inline_statics
= NULL
;
798 /* Fill in a c_spot_bindings structure. If DEFINING is true, set it
799 for the current state, otherwise set it to uninitialized. */
802 set_spot_bindings (struct c_spot_bindings
*p
, bool defining
)
806 p
->scope
= current_scope
;
807 p
->bindings_in_scope
= current_scope
->bindings
;
812 p
->bindings_in_scope
= NULL
;
815 p
->left_stmt_expr
= false;
818 /* Update spot bindings P as we pop out of SCOPE. Return true if we
819 should push decls for a label. */
822 update_spot_bindings (struct c_scope
*scope
, struct c_spot_bindings
*p
)
824 if (p
->scope
!= scope
)
826 /* This label or goto is defined in some other scope, or it is a
827 label which is not yet defined. There is nothing to
832 /* Adjust the spot bindings to refer to the bindings already defined
833 in the enclosing scope. */
834 p
->scope
= scope
->outer
;
835 p
->bindings_in_scope
= p
->scope
->bindings
;
840 /* The Objective-C front-end often needs to determine the current scope. */
843 objc_get_current_scope (void)
845 return current_scope
;
848 /* The following function is used only by Objective-C. It needs to live here
849 because it accesses the innards of c_scope. */
852 objc_mark_locals_volatile (void *enclosing_blk
)
854 struct c_scope
*scope
;
857 for (scope
= current_scope
;
858 scope
&& scope
!= enclosing_blk
;
859 scope
= scope
->outer
)
861 for (b
= scope
->bindings
; b
; b
= b
->prev
)
862 objc_volatilize_decl (b
->decl
);
864 /* Do not climb up past the current function. */
865 if (scope
->function_body
)
870 /* Return true if we are in the global binding level. */
873 global_bindings_p (void)
875 return current_scope
== file_scope
;
879 keep_next_level (void)
881 keep_next_level_flag
= true;
884 /* Set the flag for the FLOAT_CONST_DECIMAL64 pragma being ON. */
887 set_float_const_decimal64 (void)
889 current_scope
->float_const_decimal64
= true;
892 /* Clear the flag for the FLOAT_CONST_DECIMAL64 pragma. */
895 clear_float_const_decimal64 (void)
897 current_scope
->float_const_decimal64
= false;
900 /* Return nonzero if an unsuffixed float constant is _Decimal64. */
903 float_const_decimal64_p (void)
905 return current_scope
->float_const_decimal64
;
908 /* Identify this scope as currently being filled with parameters. */
911 declare_parm_level (void)
913 current_scope
->parm_flag
= true;
919 if (next_is_function_body
)
921 /* This is the transition from the parameters to the top level
922 of the function body. These are the same scope
923 (C99 6.2.1p4,6) so we do not push another scope structure.
924 next_is_function_body is set only by store_parm_decls, which
925 in turn is called when and only when we are about to
926 encounter the opening curly brace for the function body.
928 The outermost block of a function always gets a BLOCK node,
929 because the debugging output routines expect that each
930 function has at least one BLOCK. */
931 current_scope
->parm_flag
= false;
932 current_scope
->function_body
= true;
933 current_scope
->keep
= true;
934 current_scope
->outer_function
= current_function_scope
;
935 current_function_scope
= current_scope
;
937 keep_next_level_flag
= false;
938 next_is_function_body
= false;
940 /* The FLOAT_CONST_DECIMAL64 pragma applies to nested scopes. */
941 if (current_scope
->outer
)
942 current_scope
->float_const_decimal64
943 = current_scope
->outer
->float_const_decimal64
;
945 current_scope
->float_const_decimal64
= false;
949 struct c_scope
*scope
;
952 scope
= scope_freelist
;
953 scope_freelist
= scope
->outer
;
956 scope
= ggc_cleared_alloc
<c_scope
> ();
958 /* The FLOAT_CONST_DECIMAL64 pragma applies to nested scopes. */
960 scope
->float_const_decimal64
= current_scope
->float_const_decimal64
;
962 scope
->float_const_decimal64
= false;
964 scope
->keep
= keep_next_level_flag
;
965 scope
->outer
= current_scope
;
966 scope
->depth
= current_scope
? (current_scope
->depth
+ 1) : 0;
968 /* Check for scope depth overflow. Unlikely (2^28 == 268,435,456) but
970 if (current_scope
&& scope
->depth
== 0)
973 sorry ("GCC supports only %u nested scopes", scope
->depth
);
976 current_scope
= scope
;
977 keep_next_level_flag
= false;
981 /* This is called when we are leaving SCOPE. For each label defined
982 in SCOPE, add any appropriate decls to its decls_in_scope fields.
983 These are the decls whose initialization will be skipped by a goto
984 later in the function. */
987 update_label_decls (struct c_scope
*scope
)
994 if (s
->has_label_bindings
)
998 for (b
= s
->bindings
; b
!= NULL
; b
= b
->prev
)
1000 struct c_label_vars
*label_vars
;
1001 struct c_binding
*b1
;
1004 struct c_goto_bindings
*g
;
1006 if (TREE_CODE (b
->decl
) != LABEL_DECL
)
1008 label_vars
= b
->u
.label
;
1010 b1
= label_vars
->label_bindings
.bindings_in_scope
;
1011 if (label_vars
->label_bindings
.scope
== NULL
)
1014 hjud
= label_vars
->label_bindings
.scope
->has_jump_unsafe_decl
;
1015 if (update_spot_bindings (scope
, &label_vars
->label_bindings
))
1017 /* This label is defined in this scope. */
1020 for (; b1
!= NULL
; b1
= b1
->prev
)
1022 /* A goto from later in the function to this
1023 label will never see the initialization
1024 of B1, if any. Save it to issue a
1025 warning if needed. */
1026 if (decl_jump_unsafe (b1
->decl
))
1027 vec_safe_push(label_vars
->decls_in_scope
, b1
->decl
);
1032 /* Update the bindings of any goto statements associated
1034 FOR_EACH_VEC_SAFE_ELT (label_vars
->gotos
, ix
, g
)
1035 update_spot_bindings (scope
, &g
->goto_bindings
);
1039 /* Don't search beyond the current function. */
1040 if (s
== current_function_scope
)
1047 /* Set the TYPE_CONTEXT of all of TYPE's variants to CONTEXT. */
1050 set_type_context (tree type
, tree context
)
1052 for (type
= TYPE_MAIN_VARIANT (type
); type
;
1053 type
= TYPE_NEXT_VARIANT (type
))
1054 TYPE_CONTEXT (type
) = context
;
1057 /* Exit a scope. Restore the state of the identifier-decl mappings
1058 that were in effect when this scope was entered. Return a BLOCK
1059 node containing all the DECLs in this scope that are of interest
1060 to debug info generation. */
1065 struct c_scope
*scope
= current_scope
;
1066 tree block
, context
, p
;
1067 struct c_binding
*b
;
1069 bool functionbody
= scope
->function_body
;
1070 bool keep
= functionbody
|| scope
->keep
|| scope
->bindings
;
1072 update_label_decls (scope
);
1074 /* If appropriate, create a BLOCK to record the decls for the life
1075 of this function. */
1079 block
= make_node (BLOCK
);
1080 BLOCK_SUBBLOCKS (block
) = scope
->blocks
;
1081 TREE_USED (block
) = 1;
1083 /* In each subblock, record that this is its superior. */
1084 for (p
= scope
->blocks
; p
; p
= BLOCK_CHAIN (p
))
1085 BLOCK_SUPERCONTEXT (p
) = block
;
1087 BLOCK_VARS (block
) = 0;
1090 /* The TYPE_CONTEXTs for all of the tagged types belonging to this
1091 scope must be set so that they point to the appropriate
1092 construct, i.e. either to the current FUNCTION_DECL node, or
1093 else to the BLOCK node we just constructed.
1095 Note that for tagged types whose scope is just the formal
1096 parameter list for some function type specification, we can't
1097 properly set their TYPE_CONTEXTs here, because we don't have a
1098 pointer to the appropriate FUNCTION_TYPE node readily available
1099 to us. For those cases, the TYPE_CONTEXTs of the relevant tagged
1100 type nodes get set in `grokdeclarator' as soon as we have created
1101 the FUNCTION_TYPE node which will represent the "scope" for these
1102 "parameter list local" tagged types. */
1103 if (scope
->function_body
)
1104 context
= current_function_decl
;
1105 else if (scope
== file_scope
)
1107 tree file_decl
= build_translation_unit_decl (NULL_TREE
);
1108 context
= file_decl
;
1113 /* Clear all bindings in this scope. */
1114 for (b
= scope
->bindings
; b
; b
= free_binding_and_advance (b
))
1117 switch (TREE_CODE (p
))
1120 /* Warnings for unused labels, errors for undefined labels. */
1121 if (TREE_USED (p
) && !DECL_INITIAL (p
))
1123 error ("label %q+D used but not defined", p
);
1124 DECL_INITIAL (p
) = error_mark_node
;
1127 warn_for_unused_label (p
);
1129 /* Labels go in BLOCK_VARS. */
1130 DECL_CHAIN (p
) = BLOCK_VARS (block
);
1131 BLOCK_VARS (block
) = p
;
1132 gcc_assert (I_LABEL_BINDING (b
->id
) == b
);
1133 I_LABEL_BINDING (b
->id
) = b
->shadowed
;
1135 /* Also pop back to the shadowed label_vars. */
1136 release_tree_vector (b
->u
.label
->decls_in_scope
);
1137 b
->u
.label
= b
->u
.label
->shadowed
;
1143 set_type_context (p
, context
);
1145 /* Types may not have tag-names, in which case the type
1146 appears in the bindings list with b->id NULL. */
1149 gcc_assert (I_TAG_BINDING (b
->id
) == b
);
1150 I_TAG_BINDING (b
->id
) = b
->shadowed
;
1155 /* Propagate TREE_ADDRESSABLE from nested functions to their
1156 containing functions. */
1157 if (!TREE_ASM_WRITTEN (p
)
1158 && DECL_INITIAL (p
) != 0
1159 && TREE_ADDRESSABLE (p
)
1160 && DECL_ABSTRACT_ORIGIN (p
) != 0
1161 && DECL_ABSTRACT_ORIGIN (p
) != p
)
1162 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (p
)) = 1;
1163 if (!DECL_EXTERNAL (p
)
1164 && !DECL_INITIAL (p
)
1165 && scope
!= file_scope
1166 && scope
!= external_scope
)
1168 error ("nested function %q+D declared but never defined", p
);
1169 undef_nested_function
= true;
1171 else if (DECL_DECLARED_INLINE_P (p
)
1173 && !DECL_INITIAL (p
))
1175 /* C99 6.7.4p6: "a function with external linkage... declared
1176 with an inline function specifier ... shall also be defined
1177 in the same translation unit." */
1178 if (!flag_gnu89_inline
)
1179 pedwarn (input_location
, 0,
1180 "inline function %q+D declared but never defined", p
);
1181 DECL_EXTERNAL (p
) = 1;
1187 /* Warnings for unused variables. */
1188 if ((!TREE_USED (p
) || !DECL_READ_P (p
))
1189 && !TREE_NO_WARNING (p
)
1190 && !DECL_IN_SYSTEM_HEADER (p
)
1192 && !DECL_ARTIFICIAL (p
)
1193 && scope
!= file_scope
1194 && scope
!= external_scope
)
1197 warning (OPT_Wunused_variable
, "unused variable %q+D", p
);
1198 else if (DECL_CONTEXT (p
) == current_function_decl
)
1199 warning_at (DECL_SOURCE_LOCATION (p
),
1200 OPT_Wunused_but_set_variable
,
1201 "variable %qD set but not used", p
);
1206 error ("type of array %q+D completed incompatibly with"
1207 " implicit initialization", p
);
1214 /* All of these go in BLOCK_VARS, but only if this is the
1215 binding in the home scope. */
1218 DECL_CHAIN (p
) = BLOCK_VARS (block
);
1219 BLOCK_VARS (block
) = p
;
1221 else if (VAR_OR_FUNCTION_DECL_P (p
) && scope
!= file_scope
)
1223 /* For block local externs add a special
1224 DECL_EXTERNAL decl for debug info generation. */
1225 tree extp
= copy_node (p
);
1227 DECL_EXTERNAL (extp
) = 1;
1228 TREE_STATIC (extp
) = 0;
1229 TREE_PUBLIC (extp
) = 1;
1230 DECL_INITIAL (extp
) = NULL_TREE
;
1231 DECL_LANG_SPECIFIC (extp
) = NULL
;
1232 DECL_CONTEXT (extp
) = current_function_decl
;
1233 if (TREE_CODE (p
) == FUNCTION_DECL
)
1235 DECL_RESULT (extp
) = NULL_TREE
;
1236 DECL_SAVED_TREE (extp
) = NULL_TREE
;
1237 DECL_STRUCT_FUNCTION (extp
) = NULL
;
1239 if (b
->locus
!= UNKNOWN_LOCATION
)
1240 DECL_SOURCE_LOCATION (extp
) = b
->locus
;
1241 DECL_CHAIN (extp
) = BLOCK_VARS (block
);
1242 BLOCK_VARS (block
) = extp
;
1244 /* If this is the file scope set DECL_CONTEXT of each decl to
1245 the TRANSLATION_UNIT_DECL. This makes same_translation_unit_p
1247 if (scope
== file_scope
)
1249 DECL_CONTEXT (p
) = context
;
1250 if (TREE_CODE (p
) == TYPE_DECL
1251 && TREE_TYPE (p
) != error_mark_node
)
1252 set_type_context (TREE_TYPE (p
), context
);
1256 /* Parameters go in DECL_ARGUMENTS, not BLOCK_VARS, and have
1257 already been put there by store_parm_decls. Unused-
1258 parameter warnings are handled by function.c.
1259 error_mark_node obviously does not go in BLOCK_VARS and
1260 does not get unused-variable warnings. */
1263 /* It is possible for a decl not to have a name. We get
1264 here with b->id NULL in this case. */
1267 gcc_assert (I_SYMBOL_BINDING (b
->id
) == b
);
1268 I_SYMBOL_BINDING (b
->id
) = b
->shadowed
;
1269 if (b
->shadowed
&& b
->shadowed
->u
.type
)
1270 TREE_TYPE (b
->shadowed
->decl
) = b
->shadowed
->u
.type
;
1280 /* Dispose of the block that we just made inside some higher level. */
1281 if ((scope
->function_body
|| scope
== file_scope
) && context
)
1283 DECL_INITIAL (context
) = block
;
1284 BLOCK_SUPERCONTEXT (block
) = context
;
1286 else if (scope
->outer
)
1289 SCOPE_LIST_APPEND (scope
->outer
, blocks
, block
);
1290 /* If we did not make a block for the scope just exited, any
1291 blocks made for inner scopes must be carried forward so they
1292 will later become subblocks of something else. */
1293 else if (scope
->blocks
)
1294 SCOPE_LIST_CONCAT (scope
->outer
, blocks
, scope
, blocks
);
1297 /* Pop the current scope, and free the structure for reuse. */
1298 current_scope
= scope
->outer
;
1299 if (scope
->function_body
)
1300 current_function_scope
= scope
->outer_function
;
1302 memset (scope
, 0, sizeof (struct c_scope
));
1303 scope
->outer
= scope_freelist
;
1304 scope_freelist
= scope
;
1310 push_file_scope (void)
1318 file_scope
= current_scope
;
1320 start_fname_decls ();
1322 for (decl
= visible_builtins
; decl
; decl
= DECL_CHAIN (decl
))
1323 bind (DECL_NAME (decl
), decl
, file_scope
,
1324 /*invisible=*/false, /*nested=*/true, DECL_SOURCE_LOCATION (decl
));
1328 pop_file_scope (void)
1330 /* In case there were missing closebraces, get us back to the global
1332 while (current_scope
!= file_scope
)
1335 /* __FUNCTION__ is defined at file scope (""). This
1336 call may not be necessary as my tests indicate it
1337 still works without it. */
1338 finish_fname_decls ();
1340 check_inline_statics ();
1342 /* This is the point to write out a PCH if we're doing that.
1343 In that case we do not want to do anything else. */
1346 c_common_write_pch ();
1350 /* Pop off the file scope and close this translation unit. */
1354 maybe_apply_pending_pragma_weaks ();
1357 /* Adjust the bindings for the start of a statement expression. */
1360 c_bindings_start_stmt_expr (struct c_spot_bindings
* switch_bindings
)
1362 struct c_scope
*scope
;
1364 for (scope
= current_scope
; scope
!= NULL
; scope
= scope
->outer
)
1366 struct c_binding
*b
;
1368 if (!scope
->has_label_bindings
)
1371 for (b
= scope
->bindings
; b
!= NULL
; b
= b
->prev
)
1373 struct c_label_vars
*label_vars
;
1375 struct c_goto_bindings
*g
;
1377 if (TREE_CODE (b
->decl
) != LABEL_DECL
)
1379 label_vars
= b
->u
.label
;
1380 ++label_vars
->label_bindings
.stmt_exprs
;
1381 FOR_EACH_VEC_SAFE_ELT (label_vars
->gotos
, ix
, g
)
1382 ++g
->goto_bindings
.stmt_exprs
;
1386 if (switch_bindings
!= NULL
)
1387 ++switch_bindings
->stmt_exprs
;
1390 /* Adjust the bindings for the end of a statement expression. */
1393 c_bindings_end_stmt_expr (struct c_spot_bindings
*switch_bindings
)
1395 struct c_scope
*scope
;
1397 for (scope
= current_scope
; scope
!= NULL
; scope
= scope
->outer
)
1399 struct c_binding
*b
;
1401 if (!scope
->has_label_bindings
)
1404 for (b
= scope
->bindings
; b
!= NULL
; b
= b
->prev
)
1406 struct c_label_vars
*label_vars
;
1408 struct c_goto_bindings
*g
;
1410 if (TREE_CODE (b
->decl
) != LABEL_DECL
)
1412 label_vars
= b
->u
.label
;
1413 --label_vars
->label_bindings
.stmt_exprs
;
1414 if (label_vars
->label_bindings
.stmt_exprs
< 0)
1416 label_vars
->label_bindings
.left_stmt_expr
= true;
1417 label_vars
->label_bindings
.stmt_exprs
= 0;
1419 FOR_EACH_VEC_SAFE_ELT (label_vars
->gotos
, ix
, g
)
1421 --g
->goto_bindings
.stmt_exprs
;
1422 if (g
->goto_bindings
.stmt_exprs
< 0)
1424 g
->goto_bindings
.left_stmt_expr
= true;
1425 g
->goto_bindings
.stmt_exprs
= 0;
1431 if (switch_bindings
!= NULL
)
1433 --switch_bindings
->stmt_exprs
;
1434 gcc_assert (switch_bindings
->stmt_exprs
>= 0);
1438 /* Push a definition or a declaration of struct, union or enum tag "name".
1439 "type" should be the type node.
1440 We assume that the tag "name" is not already defined, and has a location
1443 Note that the definition may really be just a forward reference.
1444 In that case, the TYPE_SIZE will be zero. */
1447 pushtag (location_t loc
, tree name
, tree type
)
1449 /* Record the identifier as the type's name if it has none. */
1450 if (name
&& !TYPE_NAME (type
))
1451 TYPE_NAME (type
) = name
;
1452 bind (name
, type
, current_scope
, /*invisible=*/false, /*nested=*/false, loc
);
1454 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1455 tagged type we just added to the current scope. This fake
1456 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1457 to output a representation of a tagged type, and it also gives
1458 us a convenient place to record the "scope start" address for the
1461 TYPE_STUB_DECL (type
) = pushdecl (build_decl (loc
,
1462 TYPE_DECL
, NULL_TREE
, type
));
1464 /* An approximation for now, so we can tell this is a function-scope tag.
1465 This will be updated in pop_scope. */
1466 TYPE_CONTEXT (type
) = DECL_CONTEXT (TYPE_STUB_DECL (type
));
1468 if (warn_cxx_compat
&& name
!= NULL_TREE
)
1470 struct c_binding
*b
= I_SYMBOL_BINDING (name
);
1473 && b
->decl
!= NULL_TREE
1474 && TREE_CODE (b
->decl
) == TYPE_DECL
1475 && (B_IN_CURRENT_SCOPE (b
)
1476 || (current_scope
== file_scope
&& B_IN_EXTERNAL_SCOPE (b
)))
1477 && (TYPE_MAIN_VARIANT (TREE_TYPE (b
->decl
))
1478 != TYPE_MAIN_VARIANT (type
)))
1480 warning_at (loc
, OPT_Wc___compat
,
1481 ("using %qD as both a typedef and a tag is "
1484 if (b
->locus
!= UNKNOWN_LOCATION
)
1485 inform (b
->locus
, "originally defined here");
1490 /* Subroutine of compare_decls. Allow harmless mismatches in return
1491 and argument types provided that the type modes match. This function
1492 return a unified type given a suitable match, and 0 otherwise. */
1495 match_builtin_function_types (tree newtype
, tree oldtype
)
1497 tree newrettype
, oldrettype
;
1498 tree newargs
, oldargs
;
1499 tree trytype
, tryargs
;
1501 /* Accept the return type of the new declaration if same modes. */
1502 oldrettype
= TREE_TYPE (oldtype
);
1503 newrettype
= TREE_TYPE (newtype
);
1505 if (TYPE_MODE (oldrettype
) != TYPE_MODE (newrettype
))
1508 oldargs
= TYPE_ARG_TYPES (oldtype
);
1509 newargs
= TYPE_ARG_TYPES (newtype
);
1512 while (oldargs
|| newargs
)
1516 || !TREE_VALUE (oldargs
)
1517 || !TREE_VALUE (newargs
)
1518 || TYPE_MODE (TREE_VALUE (oldargs
))
1519 != TYPE_MODE (TREE_VALUE (newargs
)))
1522 oldargs
= TREE_CHAIN (oldargs
);
1523 newargs
= TREE_CHAIN (newargs
);
1526 trytype
= build_function_type (newrettype
, tryargs
);
1527 return build_type_attribute_variant (trytype
, TYPE_ATTRIBUTES (oldtype
));
1530 /* Subroutine of diagnose_mismatched_decls. Check for function type
1531 mismatch involving an empty arglist vs a nonempty one and give clearer
1534 diagnose_arglist_conflict (tree newdecl
, tree olddecl
,
1535 tree newtype
, tree oldtype
)
1539 if (TREE_CODE (olddecl
) != FUNCTION_DECL
1540 || !comptypes (TREE_TYPE (oldtype
), TREE_TYPE (newtype
))
1541 || !((!prototype_p (oldtype
) && DECL_INITIAL (olddecl
) == 0)
1542 || (!prototype_p (newtype
) && DECL_INITIAL (newdecl
) == 0)))
1545 t
= TYPE_ARG_TYPES (oldtype
);
1547 t
= TYPE_ARG_TYPES (newtype
);
1548 for (; t
; t
= TREE_CHAIN (t
))
1550 tree type
= TREE_VALUE (t
);
1552 if (TREE_CHAIN (t
) == 0
1553 && TYPE_MAIN_VARIANT (type
) != void_type_node
)
1555 inform (input_location
, "a parameter list with an ellipsis can%'t match "
1556 "an empty parameter name list declaration");
1560 if (c_type_promotes_to (type
) != type
)
1562 inform (input_location
, "an argument type that has a default promotion can%'t match "
1563 "an empty parameter name list declaration");
1569 /* Another subroutine of diagnose_mismatched_decls. OLDDECL is an
1570 old-style function definition, NEWDECL is a prototype declaration.
1571 Diagnose inconsistencies in the argument list. Returns TRUE if
1572 the prototype is compatible, FALSE if not. */
1574 validate_proto_after_old_defn (tree newdecl
, tree newtype
, tree oldtype
)
1576 tree newargs
, oldargs
;
1579 #define END_OF_ARGLIST(t) ((t) == void_type_node)
1581 oldargs
= TYPE_ACTUAL_ARG_TYPES (oldtype
);
1582 newargs
= TYPE_ARG_TYPES (newtype
);
1587 tree oldargtype
= TREE_VALUE (oldargs
);
1588 tree newargtype
= TREE_VALUE (newargs
);
1590 if (oldargtype
== error_mark_node
|| newargtype
== error_mark_node
)
1593 oldargtype
= (TYPE_ATOMIC (oldargtype
)
1594 ? c_build_qualified_type (TYPE_MAIN_VARIANT (oldargtype
),
1596 : TYPE_MAIN_VARIANT (oldargtype
));
1597 newargtype
= (TYPE_ATOMIC (newargtype
)
1598 ? c_build_qualified_type (TYPE_MAIN_VARIANT (newargtype
),
1600 : TYPE_MAIN_VARIANT (newargtype
));
1602 if (END_OF_ARGLIST (oldargtype
) && END_OF_ARGLIST (newargtype
))
1605 /* Reaching the end of just one list means the two decls don't
1606 agree on the number of arguments. */
1607 if (END_OF_ARGLIST (oldargtype
))
1609 error ("prototype for %q+D declares more arguments "
1610 "than previous old-style definition", newdecl
);
1613 else if (END_OF_ARGLIST (newargtype
))
1615 error ("prototype for %q+D declares fewer arguments "
1616 "than previous old-style definition", newdecl
);
1620 /* Type for passing arg must be consistent with that declared
1622 else if (!comptypes (oldargtype
, newargtype
))
1624 error ("prototype for %q+D declares argument %d"
1625 " with incompatible type",
1630 oldargs
= TREE_CHAIN (oldargs
);
1631 newargs
= TREE_CHAIN (newargs
);
1635 /* If we get here, no errors were found, but do issue a warning
1636 for this poor-style construct. */
1637 warning (0, "prototype for %q+D follows non-prototype definition",
1640 #undef END_OF_ARGLIST
1643 /* Subroutine of diagnose_mismatched_decls. Report the location of DECL,
1644 first in a pair of mismatched declarations, using the diagnostic
1647 locate_old_decl (tree decl
)
1649 if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_BUILT_IN (decl
)
1650 && !C_DECL_DECLARED_BUILTIN (decl
))
1652 else if (DECL_INITIAL (decl
))
1653 inform (input_location
, "previous definition of %q+D was here", decl
);
1654 else if (C_DECL_IMPLICIT (decl
))
1655 inform (input_location
, "previous implicit declaration of %q+D was here", decl
);
1657 inform (input_location
, "previous declaration of %q+D was here", decl
);
1660 /* Subroutine of duplicate_decls. Compare NEWDECL to OLDDECL.
1661 Returns true if the caller should proceed to merge the two, false
1662 if OLDDECL should simply be discarded. As a side effect, issues
1663 all necessary diagnostics for invalid or poor-style combinations.
1664 If it returns true, writes the types of NEWDECL and OLDDECL to
1665 *NEWTYPEP and *OLDTYPEP - these may have been adjusted from
1666 TREE_TYPE (NEWDECL, OLDDECL) respectively. */
1669 diagnose_mismatched_decls (tree newdecl
, tree olddecl
,
1670 tree
*newtypep
, tree
*oldtypep
)
1672 tree newtype
, oldtype
;
1673 bool pedwarned
= false;
1674 bool warned
= false;
1677 #define DECL_EXTERN_INLINE(DECL) (DECL_DECLARED_INLINE_P (DECL) \
1678 && DECL_EXTERNAL (DECL))
1680 /* If we have error_mark_node for either decl or type, just discard
1681 the previous decl - we're in an error cascade already. */
1682 if (olddecl
== error_mark_node
|| newdecl
== error_mark_node
)
1684 *oldtypep
= oldtype
= TREE_TYPE (olddecl
);
1685 *newtypep
= newtype
= TREE_TYPE (newdecl
);
1686 if (oldtype
== error_mark_node
|| newtype
== error_mark_node
)
1689 /* Two different categories of symbol altogether. This is an error
1690 unless OLDDECL is a builtin. OLDDECL will be discarded in any case. */
1691 if (TREE_CODE (olddecl
) != TREE_CODE (newdecl
))
1693 if (!(TREE_CODE (olddecl
) == FUNCTION_DECL
1694 && DECL_BUILT_IN (olddecl
)
1695 && !C_DECL_DECLARED_BUILTIN (olddecl
)))
1697 error ("%q+D redeclared as different kind of symbol", newdecl
);
1698 locate_old_decl (olddecl
);
1700 else if (TREE_PUBLIC (newdecl
))
1701 warning (0, "built-in function %q+D declared as non-function",
1704 warning (OPT_Wshadow
, "declaration of %q+D shadows "
1705 "a built-in function", newdecl
);
1709 /* Enumerators have no linkage, so may only be declared once in a
1711 if (TREE_CODE (olddecl
) == CONST_DECL
)
1713 error ("redeclaration of enumerator %q+D", newdecl
);
1714 locate_old_decl (olddecl
);
1718 if (!comptypes (oldtype
, newtype
))
1720 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1721 && DECL_BUILT_IN (olddecl
) && !C_DECL_DECLARED_BUILTIN (olddecl
))
1723 /* Accept harmless mismatch in function types.
1724 This is for the ffs and fprintf builtins. */
1725 tree trytype
= match_builtin_function_types (newtype
, oldtype
);
1727 if (trytype
&& comptypes (newtype
, trytype
))
1728 *oldtypep
= oldtype
= trytype
;
1731 /* If types don't match for a built-in, throw away the
1732 built-in. No point in calling locate_old_decl here, it
1733 won't print anything. */
1734 warning (0, "conflicting types for built-in function %q+D",
1739 else if (TREE_CODE (olddecl
) == FUNCTION_DECL
1740 && DECL_IS_BUILTIN (olddecl
))
1742 /* A conflicting function declaration for a predeclared
1743 function that isn't actually built in. Objective C uses
1744 these. The new declaration silently overrides everything
1745 but the volatility (i.e. noreturn) indication. See also
1746 below. FIXME: Make Objective C use normal builtins. */
1747 TREE_THIS_VOLATILE (newdecl
) |= TREE_THIS_VOLATILE (olddecl
);
1750 /* Permit void foo (...) to match int foo (...) if the latter is
1751 the definition and implicit int was used. See
1752 c-torture/compile/920625-2.c. */
1753 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
&& DECL_INITIAL (newdecl
)
1754 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype
)) == void_type_node
1755 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype
)) == integer_type_node
1756 && C_FUNCTION_IMPLICIT_INT (newdecl
) && !DECL_INITIAL (olddecl
))
1758 pedwarned
= pedwarn (input_location
, 0,
1759 "conflicting types for %q+D", newdecl
);
1760 /* Make sure we keep void as the return type. */
1761 TREE_TYPE (newdecl
) = *newtypep
= newtype
= oldtype
;
1762 C_FUNCTION_IMPLICIT_INT (newdecl
) = 0;
1764 /* Permit void foo (...) to match an earlier call to foo (...) with
1765 no declared type (thus, implicitly int). */
1766 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
1767 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype
)) == void_type_node
1768 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype
)) == integer_type_node
1769 && C_DECL_IMPLICIT (olddecl
) && !DECL_INITIAL (olddecl
))
1771 pedwarned
= pedwarn (input_location
, 0,
1772 "conflicting types for %q+D", newdecl
);
1773 /* Make sure we keep void as the return type. */
1774 TREE_TYPE (olddecl
) = *oldtypep
= oldtype
= newtype
;
1778 int new_quals
= TYPE_QUALS (newtype
);
1779 int old_quals
= TYPE_QUALS (oldtype
);
1781 if (new_quals
!= old_quals
)
1783 addr_space_t new_addr
= DECODE_QUAL_ADDR_SPACE (new_quals
);
1784 addr_space_t old_addr
= DECODE_QUAL_ADDR_SPACE (old_quals
);
1785 if (new_addr
!= old_addr
)
1787 if (ADDR_SPACE_GENERIC_P (new_addr
))
1788 error ("conflicting named address spaces (generic vs %s) "
1790 c_addr_space_name (old_addr
), newdecl
);
1791 else if (ADDR_SPACE_GENERIC_P (old_addr
))
1792 error ("conflicting named address spaces (%s vs generic) "
1794 c_addr_space_name (new_addr
), newdecl
);
1796 error ("conflicting named address spaces (%s vs %s) "
1798 c_addr_space_name (new_addr
),
1799 c_addr_space_name (old_addr
),
1803 if (CLEAR_QUAL_ADDR_SPACE (new_quals
)
1804 != CLEAR_QUAL_ADDR_SPACE (old_quals
))
1805 error ("conflicting type qualifiers for %q+D", newdecl
);
1808 error ("conflicting types for %q+D", newdecl
);
1809 diagnose_arglist_conflict (newdecl
, olddecl
, newtype
, oldtype
);
1810 locate_old_decl (olddecl
);
1815 /* Redeclaration of a type is a constraint violation (6.7.2.3p1),
1816 but silently ignore the redeclaration if either is in a system
1817 header. (Conflicting redeclarations were handled above.) This
1818 is allowed for C11 if the types are the same, not just
1820 if (TREE_CODE (newdecl
) == TYPE_DECL
)
1822 bool types_different
= false;
1823 int comptypes_result
;
1826 = comptypes_check_different_types (oldtype
, newtype
, &types_different
);
1828 if (comptypes_result
!= 1 || types_different
)
1830 error ("redefinition of typedef %q+D with different type", newdecl
);
1831 locate_old_decl (olddecl
);
1835 if (DECL_IN_SYSTEM_HEADER (newdecl
)
1836 || DECL_IN_SYSTEM_HEADER (olddecl
)
1837 || TREE_NO_WARNING (newdecl
)
1838 || TREE_NO_WARNING (olddecl
))
1839 return true; /* Allow OLDDECL to continue in use. */
1841 if (variably_modified_type_p (newtype
, NULL
))
1843 error ("redefinition of typedef %q+D with variably modified type",
1845 locate_old_decl (olddecl
);
1847 else if (pedantic
&& !flag_isoc11
)
1849 pedwarn (input_location
, OPT_Wpedantic
,
1850 "redefinition of typedef %q+D", newdecl
);
1851 locate_old_decl (olddecl
);
1857 /* Function declarations can either be 'static' or 'extern' (no
1858 qualifier is equivalent to 'extern' - C99 6.2.2p5) and therefore
1859 can never conflict with each other on account of linkage
1860 (6.2.2p4). Multiple definitions are not allowed (6.9p3,5) but
1861 gnu89 mode permits two definitions if one is 'extern inline' and
1862 one is not. The non- extern-inline definition supersedes the
1863 extern-inline definition. */
1865 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1867 /* If you declare a built-in function name as static, or
1868 define the built-in with an old-style definition (so we
1869 can't validate the argument list) the built-in definition is
1870 overridden, but optionally warn this was a bad choice of name. */
1871 if (DECL_BUILT_IN (olddecl
)
1872 && !C_DECL_DECLARED_BUILTIN (olddecl
)
1873 && (!TREE_PUBLIC (newdecl
)
1874 || (DECL_INITIAL (newdecl
)
1875 && !prototype_p (TREE_TYPE (newdecl
)))))
1877 warning (OPT_Wshadow
, "declaration of %q+D shadows "
1878 "a built-in function", newdecl
);
1879 /* Discard the old built-in function. */
1883 if (DECL_INITIAL (newdecl
))
1885 if (DECL_INITIAL (olddecl
))
1887 /* If both decls are in the same TU and the new declaration
1888 isn't overriding an extern inline reject the new decl.
1889 In c99, no overriding is allowed in the same translation
1891 if ((!DECL_EXTERN_INLINE (olddecl
)
1892 || DECL_EXTERN_INLINE (newdecl
)
1893 || (!flag_gnu89_inline
1894 && (!DECL_DECLARED_INLINE_P (olddecl
)
1895 || !lookup_attribute ("gnu_inline",
1896 DECL_ATTRIBUTES (olddecl
)))
1897 && (!DECL_DECLARED_INLINE_P (newdecl
)
1898 || !lookup_attribute ("gnu_inline",
1899 DECL_ATTRIBUTES (newdecl
))))
1901 && same_translation_unit_p (newdecl
, olddecl
))
1903 error ("redefinition of %q+D", newdecl
);
1904 locate_old_decl (olddecl
);
1909 /* If we have a prototype after an old-style function definition,
1910 the argument types must be checked specially. */
1911 else if (DECL_INITIAL (olddecl
)
1912 && !prototype_p (oldtype
) && prototype_p (newtype
)
1913 && TYPE_ACTUAL_ARG_TYPES (oldtype
)
1914 && !validate_proto_after_old_defn (newdecl
, newtype
, oldtype
))
1916 locate_old_decl (olddecl
);
1919 /* A non-static declaration (even an "extern") followed by a
1920 static declaration is undefined behavior per C99 6.2.2p3-5,7.
1921 The same is true for a static forward declaration at block
1922 scope followed by a non-static declaration/definition at file
1923 scope. Static followed by non-static at the same scope is
1924 not undefined behavior, and is the most convenient way to get
1925 some effects (see e.g. what unwind-dw2-fde-glibc.c does to
1926 the definition of _Unwind_Find_FDE in unwind-dw2-fde.c), but
1927 we do diagnose it if -Wtraditional. */
1928 if (TREE_PUBLIC (olddecl
) && !TREE_PUBLIC (newdecl
))
1930 /* Two exceptions to the rule. If olddecl is an extern
1931 inline, or a predeclared function that isn't actually
1932 built in, newdecl silently overrides olddecl. The latter
1933 occur only in Objective C; see also above. (FIXME: Make
1934 Objective C use normal builtins.) */
1935 if (!DECL_IS_BUILTIN (olddecl
)
1936 && !DECL_EXTERN_INLINE (olddecl
))
1938 error ("static declaration of %q+D follows "
1939 "non-static declaration", newdecl
);
1940 locate_old_decl (olddecl
);
1944 else if (TREE_PUBLIC (newdecl
) && !TREE_PUBLIC (olddecl
))
1946 if (DECL_CONTEXT (olddecl
))
1948 error ("non-static declaration of %q+D follows "
1949 "static declaration", newdecl
);
1950 locate_old_decl (olddecl
);
1953 else if (warn_traditional
)
1955 warned
|= warning (OPT_Wtraditional
,
1956 "non-static declaration of %q+D "
1957 "follows static declaration", newdecl
);
1961 /* Make sure gnu_inline attribute is either not present, or
1962 present on all inline decls. */
1963 if (DECL_DECLARED_INLINE_P (olddecl
)
1964 && DECL_DECLARED_INLINE_P (newdecl
))
1966 bool newa
= lookup_attribute ("gnu_inline",
1967 DECL_ATTRIBUTES (newdecl
)) != NULL
;
1968 bool olda
= lookup_attribute ("gnu_inline",
1969 DECL_ATTRIBUTES (olddecl
)) != NULL
;
1972 error_at (input_location
, "%<gnu_inline%> attribute present on %q+D",
1973 newa
? newdecl
: olddecl
);
1974 error_at (DECL_SOURCE_LOCATION (newa
? olddecl
: newdecl
),
1979 else if (TREE_CODE (newdecl
) == VAR_DECL
)
1981 /* Only variables can be thread-local, and all declarations must
1982 agree on this property. */
1983 if (C_DECL_THREADPRIVATE_P (olddecl
) && !DECL_THREAD_LOCAL_P (newdecl
))
1985 /* Nothing to check. Since OLDDECL is marked threadprivate
1986 and NEWDECL does not have a thread-local attribute, we
1987 will merge the threadprivate attribute into NEWDECL. */
1990 else if (DECL_THREAD_LOCAL_P (newdecl
) != DECL_THREAD_LOCAL_P (olddecl
))
1992 if (DECL_THREAD_LOCAL_P (newdecl
))
1993 error ("thread-local declaration of %q+D follows "
1994 "non-thread-local declaration", newdecl
);
1996 error ("non-thread-local declaration of %q+D follows "
1997 "thread-local declaration", newdecl
);
1999 locate_old_decl (olddecl
);
2003 /* Multiple initialized definitions are not allowed (6.9p3,5). */
2004 if (DECL_INITIAL (newdecl
) && DECL_INITIAL (olddecl
))
2006 error ("redefinition of %q+D", newdecl
);
2007 locate_old_decl (olddecl
);
2011 /* Objects declared at file scope: if the first declaration had
2012 external linkage (even if it was an external reference) the
2013 second must have external linkage as well, or the behavior is
2014 undefined. If the first declaration had internal linkage, then
2015 the second must too, or else be an external reference (in which
2016 case the composite declaration still has internal linkage).
2017 As for function declarations, we warn about the static-then-
2018 extern case only for -Wtraditional. See generally 6.2.2p3-5,7. */
2019 if (DECL_FILE_SCOPE_P (newdecl
)
2020 && TREE_PUBLIC (newdecl
) != TREE_PUBLIC (olddecl
))
2022 if (DECL_EXTERNAL (newdecl
))
2024 if (!DECL_FILE_SCOPE_P (olddecl
))
2026 error ("extern declaration of %q+D follows "
2027 "declaration with no linkage", newdecl
);
2028 locate_old_decl (olddecl
);
2031 else if (warn_traditional
)
2033 warned
|= warning (OPT_Wtraditional
,
2034 "non-static declaration of %q+D "
2035 "follows static declaration", newdecl
);
2040 if (TREE_PUBLIC (newdecl
))
2041 error ("non-static declaration of %q+D follows "
2042 "static declaration", newdecl
);
2044 error ("static declaration of %q+D follows "
2045 "non-static declaration", newdecl
);
2047 locate_old_decl (olddecl
);
2051 /* Two objects with the same name declared at the same block
2052 scope must both be external references (6.7p3). */
2053 else if (!DECL_FILE_SCOPE_P (newdecl
))
2055 if (DECL_EXTERNAL (newdecl
))
2057 /* Extern with initializer at block scope, which will
2058 already have received an error. */
2060 else if (DECL_EXTERNAL (olddecl
))
2062 error ("declaration of %q+D with no linkage follows "
2063 "extern declaration", newdecl
);
2064 locate_old_decl (olddecl
);
2068 error ("redeclaration of %q+D with no linkage", newdecl
);
2069 locate_old_decl (olddecl
);
2075 /* C++ does not permit a decl to appear multiple times at file
2078 && DECL_FILE_SCOPE_P (newdecl
)
2079 && !DECL_EXTERNAL (newdecl
)
2080 && !DECL_EXTERNAL (olddecl
))
2081 warned
|= warning_at (DECL_SOURCE_LOCATION (newdecl
),
2083 ("duplicate declaration of %qD is "
2089 /* All decls must agree on a visibility. */
2090 if (CODE_CONTAINS_STRUCT (TREE_CODE (newdecl
), TS_DECL_WITH_VIS
)
2091 && DECL_VISIBILITY_SPECIFIED (newdecl
) && DECL_VISIBILITY_SPECIFIED (olddecl
)
2092 && DECL_VISIBILITY (newdecl
) != DECL_VISIBILITY (olddecl
))
2094 warned
|= warning (0, "redeclaration of %q+D with different visibility "
2095 "(old visibility preserved)", newdecl
);
2098 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2100 /* Diagnose inline __attribute__ ((noinline)) which is silly. */
2101 if (DECL_DECLARED_INLINE_P (newdecl
)
2102 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl
)))
2103 warned
|= warning (OPT_Wattributes
,
2104 "inline declaration of %qD follows "
2105 "declaration with attribute noinline", newdecl
);
2106 else if (DECL_DECLARED_INLINE_P (olddecl
)
2107 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl
)))
2108 warned
|= warning (OPT_Wattributes
,
2109 "declaration of %q+D with attribute "
2110 "noinline follows inline declaration ", newdecl
);
2111 else if (lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl
))
2112 && lookup_attribute ("always_inline", DECL_ATTRIBUTES (olddecl
)))
2113 warned
|= warning (OPT_Wattributes
,
2114 "declaration of %q+D with attribute "
2115 "%qs follows declaration with attribute %qs",
2116 newdecl
, "noinline", "always_inline");
2117 else if (lookup_attribute ("always_inline", DECL_ATTRIBUTES (newdecl
))
2118 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl
)))
2119 warned
|= warning (OPT_Wattributes
,
2120 "declaration of %q+D with attribute "
2121 "%qs follows declaration with attribute %qs",
2122 newdecl
, "always_inline", "noinline");
2123 else if (lookup_attribute ("cold", DECL_ATTRIBUTES (newdecl
))
2124 && lookup_attribute ("hot", DECL_ATTRIBUTES (olddecl
)))
2125 warned
|= warning (OPT_Wattributes
,
2126 "declaration of %q+D with attribute %qs follows "
2127 "declaration with attribute %qs", newdecl
, "cold",
2129 else if (lookup_attribute ("hot", DECL_ATTRIBUTES (newdecl
))
2130 && lookup_attribute ("cold", DECL_ATTRIBUTES (olddecl
)))
2131 warned
|= warning (OPT_Wattributes
,
2132 "declaration of %q+D with attribute %qs follows "
2133 "declaration with attribute %qs", newdecl
, "hot",
2136 else /* PARM_DECL, VAR_DECL */
2138 /* Redeclaration of a parameter is a constraint violation (this is
2139 not explicitly stated, but follows from C99 6.7p3 [no more than
2140 one declaration of the same identifier with no linkage in the
2141 same scope, except type tags] and 6.2.2p6 [parameters have no
2142 linkage]). We must check for a forward parameter declaration,
2143 indicated by TREE_ASM_WRITTEN on the old declaration - this is
2144 an extension, the mandatory diagnostic for which is handled by
2145 mark_forward_parm_decls. */
2147 if (TREE_CODE (newdecl
) == PARM_DECL
2148 && (!TREE_ASM_WRITTEN (olddecl
) || TREE_ASM_WRITTEN (newdecl
)))
2150 error ("redefinition of parameter %q+D", newdecl
);
2151 locate_old_decl (olddecl
);
2156 /* Optional warning for completely redundant decls. */
2157 if (!warned
&& !pedwarned
2158 && warn_redundant_decls
2159 /* Don't warn about a function declaration followed by a
2161 && !(TREE_CODE (newdecl
) == FUNCTION_DECL
2162 && DECL_INITIAL (newdecl
) && !DECL_INITIAL (olddecl
))
2163 /* Don't warn about redundant redeclarations of builtins. */
2164 && !(TREE_CODE (newdecl
) == FUNCTION_DECL
2165 && !DECL_BUILT_IN (newdecl
)
2166 && DECL_BUILT_IN (olddecl
)
2167 && !C_DECL_DECLARED_BUILTIN (olddecl
))
2168 /* Don't warn about an extern followed by a definition. */
2169 && !(DECL_EXTERNAL (olddecl
) && !DECL_EXTERNAL (newdecl
))
2170 /* Don't warn about forward parameter decls. */
2171 && !(TREE_CODE (newdecl
) == PARM_DECL
2172 && TREE_ASM_WRITTEN (olddecl
) && !TREE_ASM_WRITTEN (newdecl
))
2173 /* Don't warn about a variable definition following a declaration. */
2174 && !(TREE_CODE (newdecl
) == VAR_DECL
2175 && DECL_INITIAL (newdecl
) && !DECL_INITIAL (olddecl
)))
2177 warned
= warning (OPT_Wredundant_decls
, "redundant redeclaration of %q+D",
2181 /* Report location of previous decl/defn. */
2182 if (warned
|| pedwarned
)
2183 locate_old_decl (olddecl
);
2185 #undef DECL_EXTERN_INLINE
2190 /* Subroutine of duplicate_decls. NEWDECL has been found to be
2191 consistent with OLDDECL, but carries new information. Merge the
2192 new information into OLDDECL. This function issues no
2196 merge_decls (tree newdecl
, tree olddecl
, tree newtype
, tree oldtype
)
2198 bool new_is_definition
= (TREE_CODE (newdecl
) == FUNCTION_DECL
2199 && DECL_INITIAL (newdecl
) != 0);
2200 bool new_is_prototype
= (TREE_CODE (newdecl
) == FUNCTION_DECL
2201 && prototype_p (TREE_TYPE (newdecl
)));
2202 bool old_is_prototype
= (TREE_CODE (olddecl
) == FUNCTION_DECL
2203 && prototype_p (TREE_TYPE (olddecl
)));
2205 /* For real parm decl following a forward decl, rechain the old decl
2206 in its new location and clear TREE_ASM_WRITTEN (it's not a
2207 forward decl anymore). */
2208 if (TREE_CODE (newdecl
) == PARM_DECL
2209 && TREE_ASM_WRITTEN (olddecl
) && !TREE_ASM_WRITTEN (newdecl
))
2211 struct c_binding
*b
, **here
;
2213 for (here
= ¤t_scope
->bindings
; *here
; here
= &(*here
)->prev
)
2214 if ((*here
)->decl
== olddecl
)
2221 b
->prev
= current_scope
->bindings
;
2222 current_scope
->bindings
= b
;
2224 TREE_ASM_WRITTEN (olddecl
) = 0;
2227 DECL_ATTRIBUTES (newdecl
)
2228 = targetm
.merge_decl_attributes (olddecl
, newdecl
);
2230 /* Merge the data types specified in the two decls. */
2232 = TREE_TYPE (olddecl
)
2233 = composite_type (newtype
, oldtype
);
2235 /* Lay the type out, unless already done. */
2236 if (!comptypes (oldtype
, TREE_TYPE (newdecl
)))
2238 if (TREE_TYPE (newdecl
) != error_mark_node
)
2239 layout_type (TREE_TYPE (newdecl
));
2240 if (TREE_CODE (newdecl
) != FUNCTION_DECL
2241 && TREE_CODE (newdecl
) != TYPE_DECL
2242 && TREE_CODE (newdecl
) != CONST_DECL
)
2243 layout_decl (newdecl
, 0);
2247 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
2248 DECL_SIZE (newdecl
) = DECL_SIZE (olddecl
);
2249 DECL_SIZE_UNIT (newdecl
) = DECL_SIZE_UNIT (olddecl
);
2250 DECL_MODE (newdecl
) = DECL_MODE (olddecl
);
2251 if (DECL_ALIGN (olddecl
) > DECL_ALIGN (newdecl
))
2253 DECL_ALIGN (newdecl
) = DECL_ALIGN (olddecl
);
2254 DECL_USER_ALIGN (newdecl
) |= DECL_USER_ALIGN (olddecl
);
2258 /* Keep the old rtl since we can safely use it. */
2259 if (HAS_RTL_P (olddecl
))
2260 COPY_DECL_RTL (olddecl
, newdecl
);
2262 /* Merge the type qualifiers. */
2263 if (TREE_READONLY (newdecl
))
2264 TREE_READONLY (olddecl
) = 1;
2266 if (TREE_THIS_VOLATILE (newdecl
))
2267 TREE_THIS_VOLATILE (olddecl
) = 1;
2269 /* Merge deprecatedness. */
2270 if (TREE_DEPRECATED (newdecl
))
2271 TREE_DEPRECATED (olddecl
) = 1;
2273 /* If a decl is in a system header and the other isn't, keep the one on the
2274 system header. Otherwise, keep source location of definition rather than
2275 declaration and of prototype rather than non-prototype unless that
2276 prototype is built-in. */
2277 if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl
), TS_DECL_WITH_VIS
)
2278 && DECL_IN_SYSTEM_HEADER (olddecl
)
2279 && !DECL_IN_SYSTEM_HEADER (newdecl
) )
2280 DECL_SOURCE_LOCATION (newdecl
) = DECL_SOURCE_LOCATION (olddecl
);
2281 else if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl
), TS_DECL_WITH_VIS
)
2282 && DECL_IN_SYSTEM_HEADER (newdecl
)
2283 && !DECL_IN_SYSTEM_HEADER (olddecl
))
2284 DECL_SOURCE_LOCATION (olddecl
) = DECL_SOURCE_LOCATION (newdecl
);
2285 else if ((DECL_INITIAL (newdecl
) == 0 && DECL_INITIAL (olddecl
) != 0)
2286 || (old_is_prototype
&& !new_is_prototype
2287 && !C_DECL_BUILTIN_PROTOTYPE (olddecl
)))
2288 DECL_SOURCE_LOCATION (newdecl
) = DECL_SOURCE_LOCATION (olddecl
);
2290 /* Merge the initialization information. */
2291 if (DECL_INITIAL (newdecl
) == 0)
2292 DECL_INITIAL (newdecl
) = DECL_INITIAL (olddecl
);
2294 /* Merge the threadprivate attribute. */
2295 if (TREE_CODE (olddecl
) == VAR_DECL
&& C_DECL_THREADPRIVATE_P (olddecl
))
2297 DECL_TLS_MODEL (newdecl
) = DECL_TLS_MODEL (olddecl
);
2298 C_DECL_THREADPRIVATE_P (newdecl
) = 1;
2301 if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl
), TS_DECL_WITH_VIS
))
2303 /* Merge the section attribute.
2304 We want to issue an error if the sections conflict but that
2305 must be done later in decl_attributes since we are called
2306 before attributes are assigned. */
2307 if (DECL_SECTION_NAME (newdecl
) == NULL_TREE
)
2308 DECL_SECTION_NAME (newdecl
) = DECL_SECTION_NAME (olddecl
);
2310 /* Copy the assembler name.
2311 Currently, it can only be defined in the prototype. */
2312 COPY_DECL_ASSEMBLER_NAME (olddecl
, newdecl
);
2314 /* Use visibility of whichever declaration had it specified */
2315 if (DECL_VISIBILITY_SPECIFIED (olddecl
))
2317 DECL_VISIBILITY (newdecl
) = DECL_VISIBILITY (olddecl
);
2318 DECL_VISIBILITY_SPECIFIED (newdecl
) = 1;
2321 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2323 DECL_STATIC_CONSTRUCTOR(newdecl
) |= DECL_STATIC_CONSTRUCTOR(olddecl
);
2324 DECL_STATIC_DESTRUCTOR (newdecl
) |= DECL_STATIC_DESTRUCTOR (olddecl
);
2325 DECL_NO_LIMIT_STACK (newdecl
) |= DECL_NO_LIMIT_STACK (olddecl
);
2326 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl
)
2327 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl
);
2328 TREE_THIS_VOLATILE (newdecl
) |= TREE_THIS_VOLATILE (olddecl
);
2329 DECL_IS_MALLOC (newdecl
) |= DECL_IS_MALLOC (olddecl
);
2330 DECL_IS_OPERATOR_NEW (newdecl
) |= DECL_IS_OPERATOR_NEW (olddecl
);
2331 TREE_READONLY (newdecl
) |= TREE_READONLY (olddecl
);
2332 DECL_PURE_P (newdecl
) |= DECL_PURE_P (olddecl
);
2333 DECL_IS_NOVOPS (newdecl
) |= DECL_IS_NOVOPS (olddecl
);
2336 /* Merge the storage class information. */
2337 merge_weak (newdecl
, olddecl
);
2339 /* For functions, static overrides non-static. */
2340 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2342 TREE_PUBLIC (newdecl
) &= TREE_PUBLIC (olddecl
);
2343 /* This is since we don't automatically
2344 copy the attributes of NEWDECL into OLDDECL. */
2345 TREE_PUBLIC (olddecl
) = TREE_PUBLIC (newdecl
);
2346 /* If this clears `static', clear it in the identifier too. */
2347 if (!TREE_PUBLIC (olddecl
))
2348 TREE_PUBLIC (DECL_NAME (olddecl
)) = 0;
2352 /* In c99, 'extern' declaration before (or after) 'inline' means this
2353 function is not DECL_EXTERNAL, unless 'gnu_inline' attribute
2355 if (TREE_CODE (newdecl
) == FUNCTION_DECL
2356 && !flag_gnu89_inline
2357 && (DECL_DECLARED_INLINE_P (newdecl
)
2358 || DECL_DECLARED_INLINE_P (olddecl
))
2359 && (!DECL_DECLARED_INLINE_P (newdecl
)
2360 || !DECL_DECLARED_INLINE_P (olddecl
)
2361 || !DECL_EXTERNAL (olddecl
))
2362 && DECL_EXTERNAL (newdecl
)
2363 && !lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (newdecl
))
2364 && !current_function_decl
)
2365 DECL_EXTERNAL (newdecl
) = 0;
2367 /* An inline definition following a static declaration is not
2369 if (new_is_definition
2370 && (DECL_DECLARED_INLINE_P (newdecl
)
2371 || DECL_DECLARED_INLINE_P (olddecl
))
2372 && !TREE_PUBLIC (olddecl
))
2373 DECL_EXTERNAL (newdecl
) = 0;
2375 if (DECL_EXTERNAL (newdecl
))
2377 TREE_STATIC (newdecl
) = TREE_STATIC (olddecl
);
2378 DECL_EXTERNAL (newdecl
) = DECL_EXTERNAL (olddecl
);
2380 /* An extern decl does not override previous storage class. */
2381 TREE_PUBLIC (newdecl
) = TREE_PUBLIC (olddecl
);
2382 if (!DECL_EXTERNAL (newdecl
))
2384 DECL_CONTEXT (newdecl
) = DECL_CONTEXT (olddecl
);
2385 DECL_COMMON (newdecl
) = DECL_COMMON (olddecl
);
2390 TREE_STATIC (olddecl
) = TREE_STATIC (newdecl
);
2391 TREE_PUBLIC (olddecl
) = TREE_PUBLIC (newdecl
);
2394 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2396 /* If we're redefining a function previously defined as extern
2397 inline, make sure we emit debug info for the inline before we
2398 throw it away, in case it was inlined into a function that
2399 hasn't been written out yet. */
2400 if (new_is_definition
&& DECL_INITIAL (olddecl
))
2401 /* The new defn must not be inline. */
2402 DECL_UNINLINABLE (newdecl
) = 1;
2405 /* If either decl says `inline', this fn is inline, unless
2406 its definition was passed already. */
2407 if (DECL_DECLARED_INLINE_P (newdecl
)
2408 || DECL_DECLARED_INLINE_P (olddecl
))
2409 DECL_DECLARED_INLINE_P (newdecl
) = 1;
2411 DECL_UNINLINABLE (newdecl
) = DECL_UNINLINABLE (olddecl
)
2412 = (DECL_UNINLINABLE (newdecl
) || DECL_UNINLINABLE (olddecl
));
2414 DECL_DISREGARD_INLINE_LIMITS (newdecl
)
2415 = DECL_DISREGARD_INLINE_LIMITS (olddecl
)
2416 = (DECL_DISREGARD_INLINE_LIMITS (newdecl
)
2417 || DECL_DISREGARD_INLINE_LIMITS (olddecl
));
2420 if (DECL_BUILT_IN (olddecl
))
2422 /* If redeclaring a builtin function, it stays built in.
2423 But it gets tagged as having been declared. */
2424 DECL_BUILT_IN_CLASS (newdecl
) = DECL_BUILT_IN_CLASS (olddecl
);
2425 DECL_FUNCTION_CODE (newdecl
) = DECL_FUNCTION_CODE (olddecl
);
2426 C_DECL_DECLARED_BUILTIN (newdecl
) = 1;
2427 if (new_is_prototype
)
2429 C_DECL_BUILTIN_PROTOTYPE (newdecl
) = 0;
2430 if (DECL_BUILT_IN_CLASS (newdecl
) == BUILT_IN_NORMAL
)
2432 enum built_in_function fncode
= DECL_FUNCTION_CODE (newdecl
);
2435 /* If a compatible prototype of these builtin functions
2436 is seen, assume the runtime implements it with the
2437 expected semantics. */
2438 case BUILT_IN_STPCPY
:
2439 if (builtin_decl_explicit_p (fncode
))
2440 set_builtin_decl_implicit_p (fncode
, true);
2448 C_DECL_BUILTIN_PROTOTYPE (newdecl
)
2449 = C_DECL_BUILTIN_PROTOTYPE (olddecl
);
2452 /* Preserve function specific target and optimization options */
2453 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl
)
2454 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl
))
2455 DECL_FUNCTION_SPECIFIC_TARGET (newdecl
)
2456 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl
);
2458 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl
)
2459 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl
))
2460 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl
)
2461 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl
);
2463 /* Also preserve various other info from the definition. */
2464 if (!new_is_definition
)
2467 DECL_RESULT (newdecl
) = DECL_RESULT (olddecl
);
2468 DECL_INITIAL (newdecl
) = DECL_INITIAL (olddecl
);
2469 DECL_STRUCT_FUNCTION (newdecl
) = DECL_STRUCT_FUNCTION (olddecl
);
2470 DECL_SAVED_TREE (newdecl
) = DECL_SAVED_TREE (olddecl
);
2471 DECL_ARGUMENTS (newdecl
) = copy_list (DECL_ARGUMENTS (olddecl
));
2472 for (t
= DECL_ARGUMENTS (newdecl
); t
; t
= DECL_CHAIN (t
))
2473 DECL_CONTEXT (t
) = newdecl
;
2475 /* See if we've got a function to instantiate from. */
2476 if (DECL_SAVED_TREE (olddecl
))
2477 DECL_ABSTRACT_ORIGIN (newdecl
)
2478 = DECL_ABSTRACT_ORIGIN (olddecl
);
2482 /* Merge the USED information. */
2483 if (TREE_USED (olddecl
))
2484 TREE_USED (newdecl
) = 1;
2485 else if (TREE_USED (newdecl
))
2486 TREE_USED (olddecl
) = 1;
2487 if (TREE_CODE (olddecl
) == VAR_DECL
|| TREE_CODE (olddecl
) == PARM_DECL
)
2488 DECL_READ_P (newdecl
) |= DECL_READ_P (olddecl
);
2489 if (DECL_PRESERVE_P (olddecl
))
2490 DECL_PRESERVE_P (newdecl
) = 1;
2491 else if (DECL_PRESERVE_P (newdecl
))
2492 DECL_PRESERVE_P (olddecl
) = 1;
2494 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
2495 But preserve OLDDECL's DECL_UID, DECL_CONTEXT and
2496 DECL_ARGUMENTS (if appropriate). */
2498 unsigned olddecl_uid
= DECL_UID (olddecl
);
2499 tree olddecl_context
= DECL_CONTEXT (olddecl
);
2500 tree olddecl_arguments
= NULL
;
2501 if (TREE_CODE (olddecl
) == FUNCTION_DECL
)
2502 olddecl_arguments
= DECL_ARGUMENTS (olddecl
);
2504 memcpy ((char *) olddecl
+ sizeof (struct tree_common
),
2505 (char *) newdecl
+ sizeof (struct tree_common
),
2506 sizeof (struct tree_decl_common
) - sizeof (struct tree_common
));
2507 DECL_USER_ALIGN (olddecl
) = DECL_USER_ALIGN (newdecl
);
2508 switch (TREE_CODE (olddecl
))
2513 struct symtab_node
*snode
= olddecl
->decl_with_vis
.symtab_node
;
2515 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
2516 (char *) newdecl
+ sizeof (struct tree_decl_common
),
2517 tree_code_size (TREE_CODE (olddecl
)) - sizeof (struct tree_decl_common
));
2518 olddecl
->decl_with_vis
.symtab_node
= snode
;
2528 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
2529 (char *) newdecl
+ sizeof (struct tree_decl_common
),
2530 tree_code_size (TREE_CODE (olddecl
)) - sizeof (struct tree_decl_common
));
2535 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
2536 (char *) newdecl
+ sizeof (struct tree_decl_common
),
2537 sizeof (struct tree_decl_non_common
) - sizeof (struct tree_decl_common
));
2539 DECL_UID (olddecl
) = olddecl_uid
;
2540 DECL_CONTEXT (olddecl
) = olddecl_context
;
2541 if (TREE_CODE (olddecl
) == FUNCTION_DECL
)
2542 DECL_ARGUMENTS (olddecl
) = olddecl_arguments
;
2545 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2546 so that encode_section_info has a chance to look at the new decl
2547 flags and attributes. */
2548 if (DECL_RTL_SET_P (olddecl
)
2549 && (TREE_CODE (olddecl
) == FUNCTION_DECL
2550 || (TREE_CODE (olddecl
) == VAR_DECL
2551 && TREE_STATIC (olddecl
))))
2552 make_decl_rtl (olddecl
);
2555 /* Handle when a new declaration NEWDECL has the same name as an old
2556 one OLDDECL in the same binding contour. Prints an error message
2559 If safely possible, alter OLDDECL to look like NEWDECL, and return
2560 true. Otherwise, return false. */
2563 duplicate_decls (tree newdecl
, tree olddecl
)
2565 tree newtype
= NULL
, oldtype
= NULL
;
2567 if (!diagnose_mismatched_decls (newdecl
, olddecl
, &newtype
, &oldtype
))
2569 /* Avoid `unused variable' and other warnings for OLDDECL. */
2570 TREE_NO_WARNING (olddecl
) = 1;
2574 merge_decls (newdecl
, olddecl
, newtype
, oldtype
);
2576 /* The NEWDECL will no longer be needed. */
2582 /* Check whether decl-node NEW_DECL shadows an existing declaration. */
2584 warn_if_shadowing (tree new_decl
)
2586 struct c_binding
*b
;
2588 /* Shadow warnings wanted? */
2590 /* No shadow warnings for internally generated vars. */
2591 || DECL_IS_BUILTIN (new_decl
)
2592 /* No shadow warnings for vars made for inlining. */
2593 || DECL_FROM_INLINE (new_decl
))
2596 /* Is anything being shadowed? Invisible decls do not count. */
2597 for (b
= I_SYMBOL_BINDING (DECL_NAME (new_decl
)); b
; b
= b
->shadowed
)
2598 if (b
->decl
&& b
->decl
!= new_decl
&& !b
->invisible
2599 && (b
->decl
== error_mark_node
2600 || diagnostic_report_warnings_p (global_dc
,
2601 DECL_SOURCE_LOCATION (b
->decl
))))
2603 tree old_decl
= b
->decl
;
2605 if (old_decl
== error_mark_node
)
2607 warning (OPT_Wshadow
, "declaration of %q+D shadows previous "
2608 "non-variable", new_decl
);
2611 else if (TREE_CODE (old_decl
) == PARM_DECL
)
2612 warning (OPT_Wshadow
, "declaration of %q+D shadows a parameter",
2614 else if (DECL_FILE_SCOPE_P (old_decl
))
2616 /* Do not warn if a variable shadows a function, unless
2617 the variable is a function or a pointer-to-function. */
2618 if (TREE_CODE (old_decl
) == FUNCTION_DECL
2619 && TREE_CODE (new_decl
) != FUNCTION_DECL
2620 && !FUNCTION_POINTER_TYPE_P (TREE_TYPE (new_decl
)))
2623 warning_at (DECL_SOURCE_LOCATION (new_decl
), OPT_Wshadow
,
2624 "declaration of %qD shadows a global declaration",
2627 else if (TREE_CODE (old_decl
) == FUNCTION_DECL
2628 && DECL_BUILT_IN (old_decl
))
2630 warning (OPT_Wshadow
, "declaration of %q+D shadows "
2631 "a built-in function", new_decl
);
2635 warning (OPT_Wshadow
, "declaration of %q+D shadows a previous local",
2638 warning_at (DECL_SOURCE_LOCATION (old_decl
), OPT_Wshadow
,
2639 "shadowed declaration is here");
2645 /* Record a decl-node X as belonging to the current lexical scope.
2646 Check for errors (such as an incompatible declaration for the same
2647 name already seen in the same scope).
2649 Returns either X or an old decl for the same name.
2650 If an old decl is returned, it may have been smashed
2651 to agree with what X says. */
2656 tree name
= DECL_NAME (x
);
2657 struct c_scope
*scope
= current_scope
;
2658 struct c_binding
*b
;
2659 bool nested
= false;
2660 location_t locus
= DECL_SOURCE_LOCATION (x
);
2662 /* Must set DECL_CONTEXT for everything not at file scope or
2663 DECL_FILE_SCOPE_P won't work. Local externs don't count
2664 unless they have initializers (which generate code). */
2665 if (current_function_decl
2666 && ((TREE_CODE (x
) != FUNCTION_DECL
&& TREE_CODE (x
) != VAR_DECL
)
2667 || DECL_INITIAL (x
) || !DECL_EXTERNAL (x
)))
2668 DECL_CONTEXT (x
) = current_function_decl
;
2670 /* Anonymous decls are just inserted in the scope. */
2673 bind (name
, x
, scope
, /*invisible=*/false, /*nested=*/false,
2678 /* First, see if there is another declaration with the same name in
2679 the current scope. If there is, duplicate_decls may do all the
2680 work for us. If duplicate_decls returns false, that indicates
2681 two incompatible decls in the same scope; we are to silently
2682 replace the old one (duplicate_decls has issued all appropriate
2683 diagnostics). In particular, we should not consider possible
2684 duplicates in the external scope, or shadowing. */
2685 b
= I_SYMBOL_BINDING (name
);
2686 if (b
&& B_IN_SCOPE (b
, scope
))
2688 struct c_binding
*b_ext
, *b_use
;
2689 tree type
= TREE_TYPE (x
);
2690 tree visdecl
= b
->decl
;
2691 tree vistype
= TREE_TYPE (visdecl
);
2692 if (TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
2693 && COMPLETE_TYPE_P (TREE_TYPE (x
)))
2694 b
->inner_comp
= false;
2697 /* If this is an external linkage declaration, we should check
2698 for compatibility with the type in the external scope before
2699 setting the type at this scope based on the visible
2700 information only. */
2701 if (TREE_PUBLIC (x
) && TREE_PUBLIC (visdecl
))
2703 while (b_ext
&& !B_IN_EXTERNAL_SCOPE (b_ext
))
2704 b_ext
= b_ext
->shadowed
;
2709 TREE_TYPE (b_use
->decl
) = b_use
->u
.type
;
2712 if (duplicate_decls (x
, b_use
->decl
))
2716 /* Save the updated type in the external scope and
2717 restore the proper type for this scope. */
2719 if (comptypes (vistype
, type
))
2720 thistype
= composite_type (vistype
, type
);
2722 thistype
= TREE_TYPE (b_use
->decl
);
2723 b_use
->u
.type
= TREE_TYPE (b_use
->decl
);
2724 if (TREE_CODE (b_use
->decl
) == FUNCTION_DECL
2725 && DECL_BUILT_IN (b_use
->decl
))
2727 = build_type_attribute_variant (thistype
,
2730 TREE_TYPE (b_use
->decl
) = thistype
;
2735 goto skip_external_and_shadow_checks
;
2738 /* All declarations with external linkage, and all external
2739 references, go in the external scope, no matter what scope is
2740 current. However, the binding in that scope is ignored for
2741 purposes of normal name lookup. A separate binding structure is
2742 created in the requested scope; this governs the normal
2743 visibility of the symbol.
2745 The binding in the externals scope is used exclusively for
2746 detecting duplicate declarations of the same object, no matter
2747 what scope they are in; this is what we do here. (C99 6.2.7p2:
2748 All declarations that refer to the same object or function shall
2749 have compatible type; otherwise, the behavior is undefined.) */
2750 if (DECL_EXTERNAL (x
) || scope
== file_scope
)
2752 tree type
= TREE_TYPE (x
);
2755 bool type_saved
= false;
2756 if (b
&& !B_IN_EXTERNAL_SCOPE (b
)
2757 && (TREE_CODE (b
->decl
) == FUNCTION_DECL
2758 || TREE_CODE (b
->decl
) == VAR_DECL
)
2759 && DECL_FILE_SCOPE_P (b
->decl
))
2762 vistype
= TREE_TYPE (visdecl
);
2764 if (scope
!= file_scope
2765 && !DECL_IN_SYSTEM_HEADER (x
))
2766 warning (OPT_Wnested_externs
, "nested extern declaration of %qD", x
);
2768 while (b
&& !B_IN_EXTERNAL_SCOPE (b
))
2770 /* If this decl might be modified, save its type. This is
2771 done here rather than when the decl is first bound
2772 because the type may change after first binding, through
2773 being completed or through attributes being added. If we
2774 encounter multiple such decls, only the first should have
2775 its type saved; the others will already have had their
2776 proper types saved and the types will not have changed as
2777 their scopes will not have been re-entered. */
2778 if (DECL_P (b
->decl
) && DECL_FILE_SCOPE_P (b
->decl
) && !type_saved
)
2780 b
->u
.type
= TREE_TYPE (b
->decl
);
2783 if (B_IN_FILE_SCOPE (b
)
2784 && TREE_CODE (b
->decl
) == VAR_DECL
2785 && TREE_STATIC (b
->decl
)
2786 && TREE_CODE (TREE_TYPE (b
->decl
)) == ARRAY_TYPE
2787 && !TYPE_DOMAIN (TREE_TYPE (b
->decl
))
2788 && TREE_CODE (type
) == ARRAY_TYPE
2789 && TYPE_DOMAIN (type
)
2790 && TYPE_MAX_VALUE (TYPE_DOMAIN (type
))
2791 && !integer_zerop (TYPE_MAX_VALUE (TYPE_DOMAIN (type
))))
2793 /* Array type completed in inner scope, which should be
2794 diagnosed if the completion does not have size 1 and
2795 it does not get completed in the file scope. */
2796 b
->inner_comp
= true;
2801 /* If a matching external declaration has been found, set its
2802 type to the composite of all the types of that declaration.
2803 After the consistency checks, it will be reset to the
2804 composite of the visible types only. */
2805 if (b
&& (TREE_PUBLIC (x
) || same_translation_unit_p (x
, b
->decl
))
2807 TREE_TYPE (b
->decl
) = b
->u
.type
;
2809 /* The point of the same_translation_unit_p check here is,
2810 we want to detect a duplicate decl for a construct like
2811 foo() { extern bar(); } ... static bar(); but not if
2812 they are in different translation units. In any case,
2813 the static does not go in the externals scope. */
2815 && (TREE_PUBLIC (x
) || same_translation_unit_p (x
, b
->decl
))
2816 && duplicate_decls (x
, b
->decl
))
2821 if (comptypes (vistype
, type
))
2822 thistype
= composite_type (vistype
, type
);
2824 thistype
= TREE_TYPE (b
->decl
);
2828 b
->u
.type
= TREE_TYPE (b
->decl
);
2829 if (TREE_CODE (b
->decl
) == FUNCTION_DECL
&& DECL_BUILT_IN (b
->decl
))
2831 = build_type_attribute_variant (thistype
,
2832 TYPE_ATTRIBUTES (b
->u
.type
));
2833 TREE_TYPE (b
->decl
) = thistype
;
2834 bind (name
, b
->decl
, scope
, /*invisible=*/false, /*nested=*/true,
2838 else if (TREE_PUBLIC (x
))
2840 if (visdecl
&& !b
&& duplicate_decls (x
, visdecl
))
2842 /* An external declaration at block scope referring to a
2843 visible entity with internal linkage. The composite
2844 type will already be correct for this scope, so we
2845 just need to fall through to make the declaration in
2852 bind (name
, x
, external_scope
, /*invisible=*/true,
2853 /*nested=*/false, locus
);
2859 if (TREE_CODE (x
) != PARM_DECL
)
2860 warn_if_shadowing (x
);
2862 skip_external_and_shadow_checks
:
2863 if (TREE_CODE (x
) == TYPE_DECL
)
2865 /* So this is a typedef, set its underlying type. */
2866 set_underlying_type (x
);
2868 /* If X is a typedef defined in the current function, record it
2869 for the purpose of implementing the -Wunused-local-typedefs
2871 record_locally_defined_typedef (x
);
2874 bind (name
, x
, scope
, /*invisible=*/false, nested
, locus
);
2876 /* If x's type is incomplete because it's based on a
2877 structure or union which has not yet been fully declared,
2878 attach it to that structure or union type, so we can go
2879 back and complete the variable declaration later, if the
2880 structure or union gets fully declared.
2882 If the input is erroneous, we can have error_mark in the type
2883 slot (e.g. "f(void a, ...)") - that doesn't count as an
2885 if (TREE_TYPE (x
) != error_mark_node
2886 && !COMPLETE_TYPE_P (TREE_TYPE (x
)))
2888 tree element
= TREE_TYPE (x
);
2890 while (TREE_CODE (element
) == ARRAY_TYPE
)
2891 element
= TREE_TYPE (element
);
2892 element
= TYPE_MAIN_VARIANT (element
);
2894 if ((TREE_CODE (element
) == RECORD_TYPE
2895 || TREE_CODE (element
) == UNION_TYPE
)
2896 && (TREE_CODE (x
) != TYPE_DECL
2897 || TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
)
2898 && !COMPLETE_TYPE_P (element
))
2899 C_TYPE_INCOMPLETE_VARS (element
)
2900 = tree_cons (NULL_TREE
, x
, C_TYPE_INCOMPLETE_VARS (element
));
2905 /* Record X as belonging to file scope.
2906 This is used only internally by the Objective-C front end,
2907 and is limited to its needs. duplicate_decls is not called;
2908 if there is any preexisting decl for this identifier, it is an ICE. */
2911 pushdecl_top_level (tree x
)
2914 bool nested
= false;
2915 gcc_assert (TREE_CODE (x
) == VAR_DECL
|| TREE_CODE (x
) == CONST_DECL
);
2917 name
= DECL_NAME (x
);
2919 gcc_assert (TREE_CODE (x
) == CONST_DECL
|| !I_SYMBOL_BINDING (name
));
2921 if (TREE_PUBLIC (x
))
2923 bind (name
, x
, external_scope
, /*invisible=*/true, /*nested=*/false,
2928 bind (name
, x
, file_scope
, /*invisible=*/false, nested
, UNKNOWN_LOCATION
);
2934 implicit_decl_warning (tree id
, tree olddecl
)
2936 if (warn_implicit_function_declaration
)
2941 warned
= pedwarn (input_location
, OPT_Wimplicit_function_declaration
,
2942 "implicit declaration of function %qE", id
);
2944 warned
= warning (OPT_Wimplicit_function_declaration
,
2945 G_("implicit declaration of function %qE"), id
);
2946 if (olddecl
&& warned
)
2947 locate_old_decl (olddecl
);
2951 /* Generate an implicit declaration for identifier FUNCTIONID at LOC as a
2952 function of type int (). */
2955 implicitly_declare (location_t loc
, tree functionid
)
2957 struct c_binding
*b
;
2961 for (b
= I_SYMBOL_BINDING (functionid
); b
; b
= b
->shadowed
)
2963 if (B_IN_SCOPE (b
, external_scope
))
2972 if (decl
== error_mark_node
)
2975 /* FIXME: Objective-C has weird not-really-builtin functions
2976 which are supposed to be visible automatically. They wind up
2977 in the external scope because they're pushed before the file
2978 scope gets created. Catch this here and rebind them into the
2980 if (!DECL_BUILT_IN (decl
) && DECL_IS_BUILTIN (decl
))
2982 bind (functionid
, decl
, file_scope
,
2983 /*invisible=*/false, /*nested=*/true,
2984 DECL_SOURCE_LOCATION (decl
));
2989 tree newtype
= default_function_type
;
2991 TREE_TYPE (decl
) = b
->u
.type
;
2992 /* Implicit declaration of a function already declared
2993 (somehow) in a different scope, or as a built-in.
2994 If this is the first time this has happened, warn;
2995 then recycle the old declaration but with the new type. */
2996 if (!C_DECL_IMPLICIT (decl
))
2998 implicit_decl_warning (functionid
, decl
);
2999 C_DECL_IMPLICIT (decl
) = 1;
3001 if (DECL_BUILT_IN (decl
))
3003 newtype
= build_type_attribute_variant (newtype
,
3005 (TREE_TYPE (decl
)));
3006 if (!comptypes (newtype
, TREE_TYPE (decl
)))
3008 warning_at (loc
, 0, "incompatible implicit declaration of "
3009 "built-in function %qD", decl
);
3010 newtype
= TREE_TYPE (decl
);
3015 if (!comptypes (newtype
, TREE_TYPE (decl
)))
3017 error_at (loc
, "incompatible implicit declaration of function %qD", decl
);
3018 locate_old_decl (decl
);
3021 b
->u
.type
= TREE_TYPE (decl
);
3022 TREE_TYPE (decl
) = newtype
;
3023 bind (functionid
, decl
, current_scope
,
3024 /*invisible=*/false, /*nested=*/true,
3025 DECL_SOURCE_LOCATION (decl
));
3030 /* Not seen before. */
3031 decl
= build_decl (loc
, FUNCTION_DECL
, functionid
, default_function_type
);
3032 DECL_EXTERNAL (decl
) = 1;
3033 TREE_PUBLIC (decl
) = 1;
3034 C_DECL_IMPLICIT (decl
) = 1;
3035 implicit_decl_warning (functionid
, 0);
3036 asmspec_tree
= maybe_apply_renaming_pragma (decl
, /*asmname=*/NULL
);
3038 set_user_assembler_name (decl
, TREE_STRING_POINTER (asmspec_tree
));
3040 /* C89 says implicit declarations are in the innermost block.
3041 So we record the decl in the standard fashion. */
3042 decl
= pushdecl (decl
);
3044 /* No need to call objc_check_decl here - it's a function type. */
3045 rest_of_decl_compilation (decl
, 0, 0);
3047 /* Write a record describing this implicit function declaration
3048 to the prototypes file (if requested). */
3049 gen_aux_info_record (decl
, 0, 1, 0);
3051 /* Possibly apply some default attributes to this implicit declaration. */
3052 decl_attributes (&decl
, NULL_TREE
, 0);
3057 /* Issue an error message for a reference to an undeclared variable
3058 ID, including a reference to a builtin outside of function-call
3059 context. Establish a binding of the identifier to error_mark_node
3060 in an appropriate scope, which will suppress further errors for the
3061 same identifier. The error message should be given location LOC. */
3063 undeclared_variable (location_t loc
, tree id
)
3065 static bool already
= false;
3066 struct c_scope
*scope
;
3068 if (current_function_decl
== 0)
3070 error_at (loc
, "%qE undeclared here (not in a function)", id
);
3071 scope
= current_scope
;
3075 if (!objc_diagnose_private_ivar (id
))
3076 error_at (loc
, "%qE undeclared (first use in this function)", id
);
3079 inform (loc
, "each undeclared identifier is reported only"
3080 " once for each function it appears in");
3084 /* If we are parsing old-style parameter decls, current_function_decl
3085 will be nonnull but current_function_scope will be null. */
3086 scope
= current_function_scope
? current_function_scope
: current_scope
;
3088 bind (id
, error_mark_node
, scope
, /*invisible=*/false, /*nested=*/false,
3092 /* Subroutine of lookup_label, declare_label, define_label: construct a
3093 LABEL_DECL with all the proper frills. Also create a struct
3094 c_label_vars initialized for the current scope. */
3097 make_label (location_t location
, tree name
, bool defining
,
3098 struct c_label_vars
**p_label_vars
)
3100 tree label
= build_decl (location
, LABEL_DECL
, name
, void_type_node
);
3101 DECL_CONTEXT (label
) = current_function_decl
;
3102 DECL_MODE (label
) = VOIDmode
;
3104 c_label_vars
*label_vars
= ggc_alloc
<c_label_vars
> ();
3105 label_vars
->shadowed
= NULL
;
3106 set_spot_bindings (&label_vars
->label_bindings
, defining
);
3107 label_vars
->decls_in_scope
= make_tree_vector ();
3108 label_vars
->gotos
= NULL
;
3109 *p_label_vars
= label_vars
;
3114 /* Get the LABEL_DECL corresponding to identifier NAME as a label.
3115 Create one if none exists so far for the current function.
3116 This is called when a label is used in a goto expression or
3117 has its address taken. */
3120 lookup_label (tree name
)
3123 struct c_label_vars
*label_vars
;
3125 if (current_function_scope
== 0)
3127 error ("label %qE referenced outside of any function", name
);
3131 /* Use a label already defined or ref'd with this name, but not if
3132 it is inherited from a containing function and wasn't declared
3134 label
= I_LABEL_DECL (name
);
3135 if (label
&& (DECL_CONTEXT (label
) == current_function_decl
3136 || C_DECLARED_LABEL_FLAG (label
)))
3138 /* If the label has only been declared, update its apparent
3139 location to point here, for better diagnostics if it
3140 turns out not to have been defined. */
3141 if (DECL_INITIAL (label
) == NULL_TREE
)
3142 DECL_SOURCE_LOCATION (label
) = input_location
;
3146 /* No label binding for that identifier; make one. */
3147 label
= make_label (input_location
, name
, false, &label_vars
);
3149 /* Ordinary labels go in the current function scope. */
3150 bind_label (name
, label
, current_function_scope
, label_vars
);
3155 /* Issue a warning about DECL for a goto statement at GOTO_LOC going
3159 warn_about_goto (location_t goto_loc
, tree label
, tree decl
)
3161 if (variably_modified_type_p (TREE_TYPE (decl
), NULL_TREE
))
3163 "jump into scope of identifier with variably modified type");
3165 warning_at (goto_loc
, OPT_Wjump_misses_init
,
3166 "jump skips variable initialization");
3167 inform (DECL_SOURCE_LOCATION (label
), "label %qD defined here", label
);
3168 inform (DECL_SOURCE_LOCATION (decl
), "%qD declared here", decl
);
3171 /* Look up a label because of a goto statement. This is like
3172 lookup_label, but also issues any appropriate warnings. */
3175 lookup_label_for_goto (location_t loc
, tree name
)
3178 struct c_label_vars
*label_vars
;
3182 label
= lookup_label (name
);
3183 if (label
== NULL_TREE
)
3186 /* If we are jumping to a different function, we can't issue any
3188 if (DECL_CONTEXT (label
) != current_function_decl
)
3190 gcc_assert (C_DECLARED_LABEL_FLAG (label
));
3194 label_vars
= I_LABEL_BINDING (name
)->u
.label
;
3196 /* If the label has not yet been defined, then push this goto on a
3197 list for possible later warnings. */
3198 if (label_vars
->label_bindings
.scope
== NULL
)
3200 c_goto_bindings
*g
= ggc_alloc
<c_goto_bindings
> ();
3203 set_spot_bindings (&g
->goto_bindings
, true);
3204 vec_safe_push (label_vars
->gotos
, g
);
3208 /* If there are any decls in label_vars->decls_in_scope, then this
3209 goto has missed the declaration of the decl. This happens for a
3215 Issue a warning or error. */
3216 FOR_EACH_VEC_SAFE_ELT (label_vars
->decls_in_scope
, ix
, decl
)
3217 warn_about_goto (loc
, label
, decl
);
3219 if (label_vars
->label_bindings
.left_stmt_expr
)
3221 error_at (loc
, "jump into statement expression");
3222 inform (DECL_SOURCE_LOCATION (label
), "label %qD defined here", label
);
3228 /* Make a label named NAME in the current function, shadowing silently
3229 any that may be inherited from containing functions or containing
3230 scopes. This is called for __label__ declarations. */
3233 declare_label (tree name
)
3235 struct c_binding
*b
= I_LABEL_BINDING (name
);
3237 struct c_label_vars
*label_vars
;
3239 /* Check to make sure that the label hasn't already been declared
3241 if (b
&& B_IN_CURRENT_SCOPE (b
))
3243 error ("duplicate label declaration %qE", name
);
3244 locate_old_decl (b
->decl
);
3246 /* Just use the previous declaration. */
3250 label
= make_label (input_location
, name
, false, &label_vars
);
3251 C_DECLARED_LABEL_FLAG (label
) = 1;
3253 /* Declared labels go in the current scope. */
3254 bind_label (name
, label
, current_scope
, label_vars
);
3259 /* When we define a label, issue any appropriate warnings if there are
3260 any gotos earlier in the function which jump to this label. */
3263 check_earlier_gotos (tree label
, struct c_label_vars
* label_vars
)
3266 struct c_goto_bindings
*g
;
3268 FOR_EACH_VEC_SAFE_ELT (label_vars
->gotos
, ix
, g
)
3270 struct c_binding
*b
;
3271 struct c_scope
*scope
;
3273 /* We have a goto to this label. The goto is going forward. In
3274 g->scope, the goto is going to skip any binding which was
3275 defined after g->bindings_in_scope. */
3276 if (g
->goto_bindings
.scope
->has_jump_unsafe_decl
)
3278 for (b
= g
->goto_bindings
.scope
->bindings
;
3279 b
!= g
->goto_bindings
.bindings_in_scope
;
3282 if (decl_jump_unsafe (b
->decl
))
3283 warn_about_goto (g
->loc
, label
, b
->decl
);
3287 /* We also need to warn about decls defined in any scopes
3288 between the scope of the label and the scope of the goto. */
3289 for (scope
= label_vars
->label_bindings
.scope
;
3290 scope
!= g
->goto_bindings
.scope
;
3291 scope
= scope
->outer
)
3293 gcc_assert (scope
!= NULL
);
3294 if (scope
->has_jump_unsafe_decl
)
3296 if (scope
== label_vars
->label_bindings
.scope
)
3297 b
= label_vars
->label_bindings
.bindings_in_scope
;
3299 b
= scope
->bindings
;
3300 for (; b
!= NULL
; b
= b
->prev
)
3302 if (decl_jump_unsafe (b
->decl
))
3303 warn_about_goto (g
->loc
, label
, b
->decl
);
3308 if (g
->goto_bindings
.stmt_exprs
> 0)
3310 error_at (g
->loc
, "jump into statement expression");
3311 inform (DECL_SOURCE_LOCATION (label
), "label %qD defined here",
3316 /* Now that the label is defined, we will issue warnings about
3317 subsequent gotos to this label when we see them. */
3318 vec_safe_truncate (label_vars
->gotos
, 0);
3319 label_vars
->gotos
= NULL
;
3322 /* Define a label, specifying the location in the source file.
3323 Return the LABEL_DECL node for the label, if the definition is valid.
3324 Otherwise return 0. */
3327 define_label (location_t location
, tree name
)
3329 /* Find any preexisting label with this name. It is an error
3330 if that label has already been defined in this function, or
3331 if there is a containing function with a declared label with
3333 tree label
= I_LABEL_DECL (name
);
3336 && ((DECL_CONTEXT (label
) == current_function_decl
3337 && DECL_INITIAL (label
) != 0)
3338 || (DECL_CONTEXT (label
) != current_function_decl
3339 && C_DECLARED_LABEL_FLAG (label
))))
3341 error_at (location
, "duplicate label %qD", label
);
3342 locate_old_decl (label
);
3345 else if (label
&& DECL_CONTEXT (label
) == current_function_decl
)
3347 struct c_label_vars
*label_vars
= I_LABEL_BINDING (name
)->u
.label
;
3349 /* The label has been used or declared already in this function,
3350 but not defined. Update its location to point to this
3352 DECL_SOURCE_LOCATION (label
) = location
;
3353 set_spot_bindings (&label_vars
->label_bindings
, true);
3355 /* Issue warnings as required about any goto statements from
3356 earlier in the function. */
3357 check_earlier_gotos (label
, label_vars
);
3361 struct c_label_vars
*label_vars
;
3363 /* No label binding for that identifier; make one. */
3364 label
= make_label (location
, name
, true, &label_vars
);
3366 /* Ordinary labels go in the current function scope. */
3367 bind_label (name
, label
, current_function_scope
, label_vars
);
3370 if (!in_system_header_at (input_location
) && lookup_name (name
))
3371 warning_at (location
, OPT_Wtraditional
,
3372 "traditional C lacks a separate namespace "
3373 "for labels, identifier %qE conflicts", name
);
3375 /* Mark label as having been defined. */
3376 DECL_INITIAL (label
) = error_mark_node
;
3380 /* Get the bindings for a new switch statement. This is used to issue
3381 warnings as appropriate for jumps from the switch to case or
3384 struct c_spot_bindings
*
3385 c_get_switch_bindings (void)
3387 struct c_spot_bindings
*switch_bindings
;
3389 switch_bindings
= XNEW (struct c_spot_bindings
);
3390 set_spot_bindings (switch_bindings
, true);
3391 return switch_bindings
;
3395 c_release_switch_bindings (struct c_spot_bindings
*bindings
)
3397 gcc_assert (bindings
->stmt_exprs
== 0 && !bindings
->left_stmt_expr
);
3401 /* This is called at the point of a case or default label to issue
3402 warnings about decls as needed. It returns true if it found an
3403 error, not just a warning. */
3406 c_check_switch_jump_warnings (struct c_spot_bindings
*switch_bindings
,
3407 location_t switch_loc
, location_t case_loc
)
3410 struct c_scope
*scope
;
3413 for (scope
= current_scope
;
3414 scope
!= switch_bindings
->scope
;
3415 scope
= scope
->outer
)
3417 struct c_binding
*b
;
3419 gcc_assert (scope
!= NULL
);
3421 if (!scope
->has_jump_unsafe_decl
)
3424 for (b
= scope
->bindings
; b
!= NULL
; b
= b
->prev
)
3426 if (decl_jump_unsafe (b
->decl
))
3428 if (variably_modified_type_p (TREE_TYPE (b
->decl
), NULL_TREE
))
3432 ("switch jumps into scope of identifier with "
3433 "variably modified type"));
3436 warning_at (case_loc
, OPT_Wjump_misses_init
,
3437 "switch jumps over variable initialization");
3438 inform (switch_loc
, "switch starts here");
3439 inform (DECL_SOURCE_LOCATION (b
->decl
), "%qD declared here",
3445 if (switch_bindings
->stmt_exprs
> 0)
3448 error_at (case_loc
, "switch jumps into statement expression");
3449 inform (switch_loc
, "switch starts here");
3455 /* Given NAME, an IDENTIFIER_NODE,
3456 return the structure (or union or enum) definition for that name.
3457 If THISLEVEL_ONLY is nonzero, searches only the current_scope.
3458 CODE says which kind of type the caller wants;
3459 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
3460 If PLOC is not NULL and this returns non-null, it sets *PLOC to the
3461 location where the tag was defined.
3462 If the wrong kind of type is found, an error is reported. */
3465 lookup_tag (enum tree_code code
, tree name
, int thislevel_only
,
3468 struct c_binding
*b
= I_TAG_BINDING (name
);
3474 /* We only care about whether it's in this level if
3475 thislevel_only was set or it might be a type clash. */
3476 if (thislevel_only
|| TREE_CODE (b
->decl
) != code
)
3478 /* For our purposes, a tag in the external scope is the same as
3479 a tag in the file scope. (Primarily relevant to Objective-C
3480 and its builtin structure tags, which get pushed before the
3481 file scope is created.) */
3482 if (B_IN_CURRENT_SCOPE (b
)
3483 || (current_scope
== file_scope
&& B_IN_EXTERNAL_SCOPE (b
)))
3487 if (thislevel_only
&& !thislevel
)
3490 if (TREE_CODE (b
->decl
) != code
)
3492 /* Definition isn't the kind we were looking for. */
3493 pending_invalid_xref
= name
;
3494 pending_invalid_xref_location
= input_location
;
3496 /* If in the same binding level as a declaration as a tag
3497 of a different type, this must not be allowed to
3498 shadow that tag, so give the error immediately.
3499 (For example, "struct foo; union foo;" is invalid.) */
3501 pending_xref_error ();
3510 /* Print an error message now
3511 for a recent invalid struct, union or enum cross reference.
3512 We don't print them immediately because they are not invalid
3513 when used in the `struct foo;' construct for shadowing. */
3516 pending_xref_error (void)
3518 if (pending_invalid_xref
!= 0)
3519 error_at (pending_invalid_xref_location
, "%qE defined as wrong kind of tag",
3520 pending_invalid_xref
);
3521 pending_invalid_xref
= 0;
3525 /* Look up NAME in the current scope and its superiors
3526 in the namespace of variables, functions and typedefs.
3527 Return a ..._DECL node of some kind representing its definition,
3528 or return 0 if it is undefined. */
3531 lookup_name (tree name
)
3533 struct c_binding
*b
= I_SYMBOL_BINDING (name
);
3534 if (b
&& !b
->invisible
)
3536 maybe_record_typedef_use (b
->decl
);
3542 /* Similar to `lookup_name' but look only at the indicated scope. */
3545 lookup_name_in_scope (tree name
, struct c_scope
*scope
)
3547 struct c_binding
*b
;
3549 for (b
= I_SYMBOL_BINDING (name
); b
; b
= b
->shadowed
)
3550 if (B_IN_SCOPE (b
, scope
))
3555 /* Create the predefined scalar types of C,
3556 and some nodes representing standard constants (0, 1, (void *) 0).
3557 Initialize the global scope.
3558 Make definitions for built-in primitive functions. */
3561 c_init_decl_processing (void)
3563 location_t save_loc
= input_location
;
3565 /* Initialize reserved words for parser. */
3568 current_function_decl
= 0;
3570 gcc_obstack_init (&parser_obstack
);
3572 /* Make the externals scope. */
3574 external_scope
= current_scope
;
3576 /* Declarations from c_common_nodes_and_builtins must not be associated
3577 with this input file, lest we get differences between using and not
3578 using preprocessed headers. */
3579 input_location
= BUILTINS_LOCATION
;
3581 c_common_nodes_and_builtins ();
3583 /* In C, comparisons and TRUTH_* expressions have type int. */
3584 truthvalue_type_node
= integer_type_node
;
3585 truthvalue_true_node
= integer_one_node
;
3586 truthvalue_false_node
= integer_zero_node
;
3588 /* Even in C99, which has a real boolean type. */
3589 pushdecl (build_decl (UNKNOWN_LOCATION
, TYPE_DECL
, get_identifier ("_Bool"),
3590 boolean_type_node
));
3592 input_location
= save_loc
;
3594 pedantic_lvalues
= true;
3596 make_fname_decl
= c_make_fname_decl
;
3597 start_fname_decls ();
3600 /* Create the VAR_DECL at LOC for __FUNCTION__ etc. ID is the name to
3601 give the decl, NAME is the initialization string and TYPE_DEP
3602 indicates whether NAME depended on the type of the function. As we
3603 don't yet implement delayed emission of static data, we mark the
3604 decl as emitted so it is not placed in the output. Anything using
3605 it must therefore pull out the STRING_CST initializer directly.
3609 c_make_fname_decl (location_t loc
, tree id
, int type_dep
)
3611 const char *name
= fname_as_string (type_dep
);
3612 tree decl
, type
, init
;
3613 size_t length
= strlen (name
);
3615 type
= build_array_type (char_type_node
,
3616 build_index_type (size_int (length
)));
3617 type
= c_build_qualified_type (type
, TYPE_QUAL_CONST
);
3619 decl
= build_decl (loc
, VAR_DECL
, id
, type
);
3621 TREE_STATIC (decl
) = 1;
3622 TREE_READONLY (decl
) = 1;
3623 DECL_ARTIFICIAL (decl
) = 1;
3625 init
= build_string (length
+ 1, name
);
3626 free (CONST_CAST (char *, name
));
3627 TREE_TYPE (init
) = type
;
3628 DECL_INITIAL (decl
) = init
;
3630 TREE_USED (decl
) = 1;
3632 if (current_function_decl
3633 /* For invalid programs like this:
3636 const char* p = __FUNCTION__;
3638 the __FUNCTION__ is believed to appear in K&R style function
3639 parameter declarator. In that case we still don't have
3641 && (!seen_error () || current_function_scope
))
3643 DECL_CONTEXT (decl
) = current_function_decl
;
3644 bind (id
, decl
, current_function_scope
,
3645 /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION
);
3648 finish_decl (decl
, loc
, init
, NULL_TREE
, NULL_TREE
);
3654 c_builtin_function (tree decl
)
3656 tree type
= TREE_TYPE (decl
);
3657 tree id
= DECL_NAME (decl
);
3659 const char *name
= IDENTIFIER_POINTER (id
);
3660 C_DECL_BUILTIN_PROTOTYPE (decl
) = prototype_p (type
);
3662 /* Should never be called on a symbol with a preexisting meaning. */
3663 gcc_assert (!I_SYMBOL_BINDING (id
));
3665 bind (id
, decl
, external_scope
, /*invisible=*/true, /*nested=*/false,
3668 /* Builtins in the implementation namespace are made visible without
3669 needing to be explicitly declared. See push_file_scope. */
3670 if (name
[0] == '_' && (name
[1] == '_' || ISUPPER (name
[1])))
3672 DECL_CHAIN (decl
) = visible_builtins
;
3673 visible_builtins
= decl
;
3680 c_builtin_function_ext_scope (tree decl
)
3682 tree type
= TREE_TYPE (decl
);
3683 tree id
= DECL_NAME (decl
);
3685 const char *name
= IDENTIFIER_POINTER (id
);
3686 C_DECL_BUILTIN_PROTOTYPE (decl
) = prototype_p (type
);
3689 bind (id
, decl
, external_scope
, /*invisible=*/false, /*nested=*/false,
3692 /* Builtins in the implementation namespace are made visible without
3693 needing to be explicitly declared. See push_file_scope. */
3694 if (name
[0] == '_' && (name
[1] == '_' || ISUPPER (name
[1])))
3696 DECL_CHAIN (decl
) = visible_builtins
;
3697 visible_builtins
= decl
;
3703 /* Called when a declaration is seen that contains no names to declare.
3704 If its type is a reference to a structure, union or enum inherited
3705 from a containing scope, shadow that tag name for the current scope
3706 with a forward reference.
3707 If its type defines a new named structure or union
3708 or defines an enum, it is valid but we need not do anything here.
3709 Otherwise, it is an error. */
3712 shadow_tag (const struct c_declspecs
*declspecs
)
3714 shadow_tag_warned (declspecs
, 0);
3717 /* WARNED is 1 if we have done a pedwarn, 2 if we have done a warning,
3720 shadow_tag_warned (const struct c_declspecs
*declspecs
, int warned
)
3722 bool found_tag
= false;
3724 if (declspecs
->type
&& !declspecs
->default_int_p
&& !declspecs
->typedef_p
)
3726 tree value
= declspecs
->type
;
3727 enum tree_code code
= TREE_CODE (value
);
3729 if (code
== RECORD_TYPE
|| code
== UNION_TYPE
|| code
== ENUMERAL_TYPE
)
3730 /* Used to test also that TYPE_SIZE (value) != 0.
3731 That caused warning for `struct foo;' at top level in the file. */
3733 tree name
= TYPE_NAME (value
);
3738 if (declspecs
->restrict_p
)
3740 error ("invalid use of %<restrict%>");
3746 if (warned
!= 1 && code
!= ENUMERAL_TYPE
)
3747 /* Empty unnamed enum OK */
3749 pedwarn (input_location
, 0,
3750 "unnamed struct/union that defines no instances");
3754 else if (declspecs
->typespec_kind
!= ctsk_tagdef
3755 && declspecs
->typespec_kind
!= ctsk_tagfirstref
3756 && declspecs
->storage_class
!= csc_none
)
3759 pedwarn (input_location
, 0,
3760 "empty declaration with storage class specifier "
3761 "does not redeclare tag");
3763 pending_xref_error ();
3765 else if (declspecs
->typespec_kind
!= ctsk_tagdef
3766 && declspecs
->typespec_kind
!= ctsk_tagfirstref
3767 && (declspecs
->const_p
3768 || declspecs
->volatile_p
3769 || declspecs
->atomic_p
3770 || declspecs
->restrict_p
3771 || declspecs
->address_space
))
3774 pedwarn (input_location
, 0,
3775 "empty declaration with type qualifier "
3776 "does not redeclare tag");
3778 pending_xref_error ();
3780 else if (declspecs
->typespec_kind
!= ctsk_tagdef
3781 && declspecs
->typespec_kind
!= ctsk_tagfirstref
3782 && declspecs
->alignas_p
)
3785 pedwarn (input_location
, 0,
3786 "empty declaration with %<_Alignas%> "
3787 "does not redeclare tag");
3789 pending_xref_error ();
3793 pending_invalid_xref
= 0;
3794 t
= lookup_tag (code
, name
, 1, NULL
);
3798 t
= make_node (code
);
3799 pushtag (input_location
, name
, t
);
3805 if (warned
!= 1 && !in_system_header_at (input_location
))
3807 pedwarn (input_location
, 0,
3808 "useless type name in empty declaration");
3813 else if (warned
!= 1 && !in_system_header_at (input_location
)
3814 && declspecs
->typedef_p
)
3816 pedwarn (input_location
, 0, "useless type name in empty declaration");
3820 pending_invalid_xref
= 0;
3822 if (declspecs
->inline_p
)
3824 error ("%<inline%> in empty declaration");
3828 if (declspecs
->noreturn_p
)
3830 error ("%<_Noreturn%> in empty declaration");
3834 if (current_scope
== file_scope
&& declspecs
->storage_class
== csc_auto
)
3836 error ("%<auto%> in file-scope empty declaration");
3840 if (current_scope
== file_scope
&& declspecs
->storage_class
== csc_register
)
3842 error ("%<register%> in file-scope empty declaration");
3846 if (!warned
&& !in_system_header_at (input_location
)
3847 && declspecs
->storage_class
!= csc_none
)
3849 warning (0, "useless storage class specifier in empty declaration");
3853 if (!warned
&& !in_system_header_at (input_location
) && declspecs
->thread_p
)
3855 warning (0, "useless %qs in empty declaration",
3856 declspecs
->thread_gnu_p
? "__thread" : "_Thread_local");
3861 && !in_system_header_at (input_location
)
3862 && (declspecs
->const_p
3863 || declspecs
->volatile_p
3864 || declspecs
->atomic_p
3865 || declspecs
->restrict_p
3866 || declspecs
->address_space
))
3868 warning (0, "useless type qualifier in empty declaration");
3872 if (!warned
&& !in_system_header_at (input_location
)
3873 && declspecs
->alignas_p
)
3875 warning (0, "useless %<_Alignas%> in empty declaration");
3882 pedwarn (input_location
, 0, "empty declaration");
3887 /* Return the qualifiers from SPECS as a bitwise OR of TYPE_QUAL_*
3888 bits. SPECS represents declaration specifiers that the grammar
3889 only permits to contain type qualifiers and attributes. */
3892 quals_from_declspecs (const struct c_declspecs
*specs
)
3894 int quals
= ((specs
->const_p
? TYPE_QUAL_CONST
: 0)
3895 | (specs
->volatile_p
? TYPE_QUAL_VOLATILE
: 0)
3896 | (specs
->restrict_p
? TYPE_QUAL_RESTRICT
: 0)
3897 | (specs
->atomic_p
? TYPE_QUAL_ATOMIC
: 0)
3898 | (ENCODE_QUAL_ADDR_SPACE (specs
->address_space
)));
3899 gcc_assert (!specs
->type
3900 && !specs
->decl_attr
3901 && specs
->typespec_word
== cts_none
3902 && specs
->storage_class
== csc_none
3903 && !specs
->typedef_p
3904 && !specs
->explicit_signed_p
3905 && !specs
->deprecated_p
3907 && !specs
->long_long_p
3910 && !specs
->unsigned_p
3911 && !specs
->complex_p
3913 && !specs
->noreturn_p
3914 && !specs
->thread_p
);
3918 /* Construct an array declarator. LOC is the location of the
3919 beginning of the array (usually the opening brace). EXPR is the
3920 expression inside [], or NULL_TREE. QUALS are the type qualifiers
3921 inside the [] (to be applied to the pointer to which a parameter
3922 array is converted). STATIC_P is true if "static" is inside the
3923 [], false otherwise. VLA_UNSPEC_P is true if the array is [*], a
3924 VLA of unspecified length which is nevertheless a complete type,
3925 false otherwise. The field for the contained declarator is left to
3926 be filled in by set_array_declarator_inner. */
3928 struct c_declarator
*
3929 build_array_declarator (location_t loc
,
3930 tree expr
, struct c_declspecs
*quals
, bool static_p
,
3933 struct c_declarator
*declarator
= XOBNEW (&parser_obstack
,
3934 struct c_declarator
);
3935 declarator
->id_loc
= loc
;
3936 declarator
->kind
= cdk_array
;
3937 declarator
->declarator
= 0;
3938 declarator
->u
.array
.dimen
= expr
;
3941 declarator
->u
.array
.attrs
= quals
->attrs
;
3942 declarator
->u
.array
.quals
= quals_from_declspecs (quals
);
3946 declarator
->u
.array
.attrs
= NULL_TREE
;
3947 declarator
->u
.array
.quals
= 0;
3949 declarator
->u
.array
.static_p
= static_p
;
3950 declarator
->u
.array
.vla_unspec_p
= vla_unspec_p
;
3953 if (static_p
|| quals
!= NULL
)
3954 pedwarn (loc
, OPT_Wpedantic
,
3955 "ISO C90 does not support %<static%> or type "
3956 "qualifiers in parameter array declarators");
3958 pedwarn (loc
, OPT_Wpedantic
,
3959 "ISO C90 does not support %<[*]%> array declarators");
3963 if (!current_scope
->parm_flag
)
3966 error_at (loc
, "%<[*]%> not allowed in other than "
3967 "function prototype scope");
3968 declarator
->u
.array
.vla_unspec_p
= false;
3971 current_scope
->had_vla_unspec
= true;
3976 /* Set the contained declarator of an array declarator. DECL is the
3977 declarator, as constructed by build_array_declarator; INNER is what
3978 appears on the left of the []. */
3980 struct c_declarator
*
3981 set_array_declarator_inner (struct c_declarator
*decl
,
3982 struct c_declarator
*inner
)
3984 decl
->declarator
= inner
;
3988 /* INIT is a constructor that forms DECL's initializer. If the final
3989 element initializes a flexible array field, add the size of that
3990 initializer to DECL's size. */
3993 add_flexible_array_elts_to_size (tree decl
, tree init
)
3997 if (vec_safe_is_empty (CONSTRUCTOR_ELTS (init
)))
4000 elt
= CONSTRUCTOR_ELTS (init
)->last ().value
;
4001 type
= TREE_TYPE (elt
);
4002 if (TREE_CODE (type
) == ARRAY_TYPE
4003 && TYPE_SIZE (type
) == NULL_TREE
4004 && TYPE_DOMAIN (type
) != NULL_TREE
4005 && TYPE_MAX_VALUE (TYPE_DOMAIN (type
)) == NULL_TREE
)
4007 complete_array_type (&type
, elt
, false);
4009 = size_binop (PLUS_EXPR
, DECL_SIZE (decl
), TYPE_SIZE (type
));
4010 DECL_SIZE_UNIT (decl
)
4011 = size_binop (PLUS_EXPR
, DECL_SIZE_UNIT (decl
), TYPE_SIZE_UNIT (type
));
4015 /* Decode a "typename", such as "int **", returning a ..._TYPE node.
4016 Set *EXPR, if EXPR not NULL, to any expression to be evaluated
4017 before the type name, and set *EXPR_CONST_OPERANDS, if
4018 EXPR_CONST_OPERANDS not NULL, to indicate whether the type name may
4019 appear in a constant expression. */
4022 groktypename (struct c_type_name
*type_name
, tree
*expr
,
4023 bool *expr_const_operands
)
4026 tree attrs
= type_name
->specs
->attrs
;
4028 type_name
->specs
->attrs
= NULL_TREE
;
4030 type
= grokdeclarator (type_name
->declarator
, type_name
->specs
, TYPENAME
,
4031 false, NULL
, &attrs
, expr
, expr_const_operands
,
4034 /* Apply attributes. */
4035 decl_attributes (&type
, attrs
, 0);
4040 /* Wrapper for decl_attributes that adds some implicit attributes
4041 to VAR_DECLs or FUNCTION_DECLs. */
4044 c_decl_attributes (tree
*node
, tree attributes
, int flags
)
4046 /* Add implicit "omp declare target" attribute if requested. */
4047 if (current_omp_declare_target_attribute
4048 && ((TREE_CODE (*node
) == VAR_DECL
&& TREE_STATIC (*node
))
4049 || TREE_CODE (*node
) == FUNCTION_DECL
))
4051 if (TREE_CODE (*node
) == VAR_DECL
4052 && ((DECL_CONTEXT (*node
)
4053 && TREE_CODE (DECL_CONTEXT (*node
)) == FUNCTION_DECL
)
4054 || (current_function_decl
&& !DECL_EXTERNAL (*node
))))
4055 error ("%q+D in block scope inside of declare target directive",
4057 else if (TREE_CODE (*node
) == VAR_DECL
4058 && !lang_hooks
.types
.omp_mappable_type (TREE_TYPE (*node
)))
4059 error ("%q+D in declare target directive does not have mappable type",
4062 attributes
= tree_cons (get_identifier ("omp declare target"),
4063 NULL_TREE
, attributes
);
4065 return decl_attributes (node
, attributes
, flags
);
4069 /* Decode a declarator in an ordinary declaration or data definition.
4070 This is called as soon as the type information and variable name
4071 have been parsed, before parsing the initializer if any.
4072 Here we create the ..._DECL node, fill in its type,
4073 and put it on the list of decls for the current context.
4074 The ..._DECL node is returned as the value.
4076 Exception: for arrays where the length is not specified,
4077 the type is left null, to be filled in by `finish_decl'.
4079 Function definitions do not come here; they go to start_function
4080 instead. However, external and forward declarations of functions
4081 do go through here. Structure field declarations are done by
4082 grokfield and not through here. */
4085 start_decl (struct c_declarator
*declarator
, struct c_declspecs
*declspecs
,
4086 bool initialized
, tree attributes
)
4090 tree expr
= NULL_TREE
;
4091 enum deprecated_states deprecated_state
= DEPRECATED_NORMAL
;
4093 /* An object declared as __attribute__((deprecated)) suppresses
4094 warnings of uses of other deprecated items. */
4095 if (lookup_attribute ("deprecated", attributes
))
4096 deprecated_state
= DEPRECATED_SUPPRESS
;
4098 decl
= grokdeclarator (declarator
, declspecs
,
4099 NORMAL
, initialized
, NULL
, &attributes
, &expr
, NULL
,
4105 add_stmt (fold_convert (void_type_node
, expr
));
4107 if (TREE_CODE (decl
) != FUNCTION_DECL
&& MAIN_NAME_P (DECL_NAME (decl
)))
4108 warning (OPT_Wmain
, "%q+D is usually a function", decl
);
4111 /* Is it valid for this decl to have an initializer at all?
4112 If not, set INITIALIZED to zero, which will indirectly
4113 tell 'finish_decl' to ignore the initializer once it is parsed. */
4114 switch (TREE_CODE (decl
))
4117 error ("typedef %qD is initialized (use __typeof__ instead)", decl
);
4122 error ("function %qD is initialized like a variable", decl
);
4127 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
4128 error ("parameter %qD is initialized", decl
);
4133 /* Don't allow initializations for incomplete types except for
4134 arrays which might be completed by the initialization. */
4136 /* This can happen if the array size is an undefined macro.
4137 We already gave a warning, so we don't need another one. */
4138 if (TREE_TYPE (decl
) == error_mark_node
)
4140 else if (COMPLETE_TYPE_P (TREE_TYPE (decl
)))
4142 /* A complete type is ok if size is fixed. */
4144 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl
))) != INTEGER_CST
4145 || C_DECL_VARIABLE_SIZE (decl
))
4147 error ("variable-sized object may not be initialized");
4151 else if (TREE_CODE (TREE_TYPE (decl
)) != ARRAY_TYPE
)
4153 error ("variable %qD has initializer but incomplete type", decl
);
4156 else if (C_DECL_VARIABLE_SIZE (decl
))
4158 /* Although C99 is unclear about whether incomplete arrays
4159 of VLAs themselves count as VLAs, it does not make
4160 sense to permit them to be initialized given that
4161 ordinary VLAs may not be initialized. */
4162 error ("variable-sized object may not be initialized");
4169 if (current_scope
== file_scope
)
4170 TREE_STATIC (decl
) = 1;
4172 /* Tell 'pushdecl' this is an initialized decl
4173 even though we don't yet have the initializer expression.
4174 Also tell 'finish_decl' it may store the real initializer. */
4175 DECL_INITIAL (decl
) = error_mark_node
;
4178 /* If this is a function declaration, write a record describing it to the
4179 prototypes file (if requested). */
4181 if (TREE_CODE (decl
) == FUNCTION_DECL
)
4182 gen_aux_info_record (decl
, 0, 0, prototype_p (TREE_TYPE (decl
)));
4184 /* ANSI specifies that a tentative definition which is not merged with
4185 a non-tentative definition behaves exactly like a definition with an
4186 initializer equal to zero. (Section 3.7.2)
4188 -fno-common gives strict ANSI behavior, though this tends to break
4189 a large body of code that grew up without this rule.
4191 Thread-local variables are never common, since there's no entrenched
4192 body of code to break, and it allows more efficient variable references
4193 in the presence of dynamic linking. */
4195 if (TREE_CODE (decl
) == VAR_DECL
4197 && TREE_PUBLIC (decl
)
4198 && !DECL_THREAD_LOCAL_P (decl
)
4200 DECL_COMMON (decl
) = 1;
4202 /* Set attributes here so if duplicate decl, will have proper attributes. */
4203 c_decl_attributes (&decl
, attributes
, 0);
4205 /* Handle gnu_inline attribute. */
4206 if (declspecs
->inline_p
4207 && !flag_gnu89_inline
4208 && TREE_CODE (decl
) == FUNCTION_DECL
4209 && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl
))
4210 || current_function_decl
))
4212 if (declspecs
->storage_class
== csc_auto
&& current_scope
!= file_scope
)
4214 else if (declspecs
->storage_class
!= csc_static
)
4215 DECL_EXTERNAL (decl
) = !DECL_EXTERNAL (decl
);
4218 if (TREE_CODE (decl
) == FUNCTION_DECL
4219 && targetm
.calls
.promote_prototypes (TREE_TYPE (decl
)))
4221 struct c_declarator
*ce
= declarator
;
4223 if (ce
->kind
== cdk_pointer
)
4224 ce
= declarator
->declarator
;
4225 if (ce
->kind
== cdk_function
)
4227 tree args
= ce
->u
.arg_info
->parms
;
4228 for (; args
; args
= DECL_CHAIN (args
))
4230 tree type
= TREE_TYPE (args
);
4231 if (type
&& INTEGRAL_TYPE_P (type
)
4232 && TYPE_PRECISION (type
) < TYPE_PRECISION (integer_type_node
))
4233 DECL_ARG_TYPE (args
) = c_type_promotes_to (type
);
4238 if (TREE_CODE (decl
) == FUNCTION_DECL
4239 && DECL_DECLARED_INLINE_P (decl
)
4240 && DECL_UNINLINABLE (decl
)
4241 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl
)))
4242 warning (OPT_Wattributes
, "inline function %q+D given attribute noinline",
4245 /* C99 6.7.4p3: An inline definition of a function with external
4246 linkage shall not contain a definition of a modifiable object
4247 with static storage duration... */
4248 if (TREE_CODE (decl
) == VAR_DECL
4249 && current_scope
!= file_scope
4250 && TREE_STATIC (decl
)
4251 && !TREE_READONLY (decl
)
4252 && DECL_DECLARED_INLINE_P (current_function_decl
)
4253 && DECL_EXTERNAL (current_function_decl
))
4254 record_inline_static (input_location
, current_function_decl
,
4255 decl
, csi_modifiable
);
4257 if (c_dialect_objc ()
4258 && (TREE_CODE (decl
) == VAR_DECL
4259 || TREE_CODE (decl
) == FUNCTION_DECL
))
4260 objc_check_global_decl (decl
);
4262 /* Add this decl to the current scope.
4263 TEM may equal DECL or it may be a previous decl of the same name. */
4264 tem
= pushdecl (decl
);
4266 if (initialized
&& DECL_EXTERNAL (tem
))
4268 DECL_EXTERNAL (tem
) = 0;
4269 TREE_STATIC (tem
) = 1;
4275 /* Subroutine of finish_decl. TYPE is the type of an uninitialized object
4276 DECL or the non-array element type if DECL is an uninitialized array.
4277 If that type has a const member, diagnose this. */
4280 diagnose_uninitialized_cst_member (tree decl
, tree type
)
4283 for (field
= TYPE_FIELDS (type
); field
; field
= TREE_CHAIN (field
))
4286 if (TREE_CODE (field
) != FIELD_DECL
)
4288 field_type
= strip_array_types (TREE_TYPE (field
));
4290 if (TYPE_QUALS (field_type
) & TYPE_QUAL_CONST
)
4292 warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wc___compat
,
4293 "uninitialized const member in %qT is invalid in C++",
4294 strip_array_types (TREE_TYPE (decl
)));
4295 inform (DECL_SOURCE_LOCATION (field
), "%qD should be initialized", field
);
4298 if (TREE_CODE (field_type
) == RECORD_TYPE
4299 || TREE_CODE (field_type
) == UNION_TYPE
)
4300 diagnose_uninitialized_cst_member (decl
, field_type
);
4304 /* Finish processing of a declaration;
4305 install its initial value.
4306 If ORIGTYPE is not NULL_TREE, it is the original type of INIT.
4307 If the length of an array type is not known before,
4308 it must be determined now, from the initial value, or it is an error.
4310 INIT_LOC is the location of the initial value. */
4313 finish_decl (tree decl
, location_t init_loc
, tree init
,
4314 tree origtype
, tree asmspec_tree
)
4317 bool was_incomplete
= (DECL_SIZE (decl
) == 0);
4318 const char *asmspec
= 0;
4320 /* If a name was specified, get the string. */
4321 if ((TREE_CODE (decl
) == FUNCTION_DECL
|| TREE_CODE (decl
) == VAR_DECL
)
4322 && DECL_FILE_SCOPE_P (decl
))
4323 asmspec_tree
= maybe_apply_renaming_pragma (decl
, asmspec_tree
);
4325 asmspec
= TREE_STRING_POINTER (asmspec_tree
);
4327 if (TREE_CODE (decl
) == VAR_DECL
4328 && TREE_STATIC (decl
)
4329 && global_bindings_p ())
4330 /* So decl is a global variable. Record the types it uses
4331 so that we can decide later to emit debug info for them. */
4332 record_types_used_by_current_var_decl (decl
);
4334 /* If `start_decl' didn't like having an initialization, ignore it now. */
4335 if (init
!= 0 && DECL_INITIAL (decl
) == 0)
4338 /* Don't crash if parm is initialized. */
4339 if (TREE_CODE (decl
) == PARM_DECL
)
4343 store_init_value (init_loc
, decl
, init
, origtype
);
4345 if (c_dialect_objc () && (TREE_CODE (decl
) == VAR_DECL
4346 || TREE_CODE (decl
) == FUNCTION_DECL
4347 || TREE_CODE (decl
) == FIELD_DECL
))
4348 objc_check_decl (decl
);
4350 type
= TREE_TYPE (decl
);
4352 /* Deduce size of array from initialization, if not already known. */
4353 if (TREE_CODE (type
) == ARRAY_TYPE
4354 && TYPE_DOMAIN (type
) == 0
4355 && TREE_CODE (decl
) != TYPE_DECL
)
4358 = (TREE_STATIC (decl
)
4359 /* Even if pedantic, an external linkage array
4360 may have incomplete type at first. */
4361 ? pedantic
&& !TREE_PUBLIC (decl
)
4362 : !DECL_EXTERNAL (decl
));
4364 = complete_array_type (&TREE_TYPE (decl
), DECL_INITIAL (decl
),
4367 /* Get the completed type made by complete_array_type. */
4368 type
= TREE_TYPE (decl
);
4373 error ("initializer fails to determine size of %q+D", decl
);
4378 error ("array size missing in %q+D", decl
);
4379 /* If a `static' var's size isn't known,
4380 make it extern as well as static, so it does not get
4382 If it is not `static', then do not mark extern;
4383 finish_incomplete_decl will give it a default size
4384 and it will get allocated. */
4385 else if (!pedantic
&& TREE_STATIC (decl
) && !TREE_PUBLIC (decl
))
4386 DECL_EXTERNAL (decl
) = 1;
4390 error ("zero or negative size array %q+D", decl
);
4394 /* For global variables, update the copy of the type that
4395 exists in the binding. */
4396 if (TREE_PUBLIC (decl
))
4398 struct c_binding
*b_ext
= I_SYMBOL_BINDING (DECL_NAME (decl
));
4399 while (b_ext
&& !B_IN_EXTERNAL_SCOPE (b_ext
))
4400 b_ext
= b_ext
->shadowed
;
4403 if (b_ext
->u
.type
&& comptypes (b_ext
->u
.type
, type
))
4404 b_ext
->u
.type
= composite_type (b_ext
->u
.type
, type
);
4406 b_ext
->u
.type
= type
;
4415 if (DECL_INITIAL (decl
))
4416 TREE_TYPE (DECL_INITIAL (decl
)) = type
;
4418 relayout_decl (decl
);
4421 if (TREE_CODE (decl
) == VAR_DECL
)
4423 if (init
&& TREE_CODE (init
) == CONSTRUCTOR
)
4424 add_flexible_array_elts_to_size (decl
, init
);
4426 if (DECL_SIZE (decl
) == 0 && TREE_TYPE (decl
) != error_mark_node
4427 && COMPLETE_TYPE_P (TREE_TYPE (decl
)))
4428 layout_decl (decl
, 0);
4430 if (DECL_SIZE (decl
) == 0
4431 /* Don't give an error if we already gave one earlier. */
4432 && TREE_TYPE (decl
) != error_mark_node
4433 && (TREE_STATIC (decl
)
4434 /* A static variable with an incomplete type
4435 is an error if it is initialized.
4436 Also if it is not file scope.
4437 Otherwise, let it through, but if it is not `extern'
4438 then it may cause an error message later. */
4439 ? (DECL_INITIAL (decl
) != 0
4440 || !DECL_FILE_SCOPE_P (decl
))
4441 /* An automatic variable with an incomplete type
4443 : !DECL_EXTERNAL (decl
)))
4445 error ("storage size of %q+D isn%'t known", decl
);
4446 TREE_TYPE (decl
) = error_mark_node
;
4449 if ((DECL_EXTERNAL (decl
) || TREE_STATIC (decl
))
4450 && DECL_SIZE (decl
) != 0)
4452 if (TREE_CODE (DECL_SIZE (decl
)) == INTEGER_CST
)
4453 constant_expression_warning (DECL_SIZE (decl
));
4456 error ("storage size of %q+D isn%'t constant", decl
);
4457 TREE_TYPE (decl
) = error_mark_node
;
4461 if (TREE_USED (type
))
4463 TREE_USED (decl
) = 1;
4464 DECL_READ_P (decl
) = 1;
4468 /* If this is a function and an assembler name is specified, reset DECL_RTL
4469 so we can give it its new name. Also, update builtin_decl if it
4470 was a normal built-in. */
4471 if (TREE_CODE (decl
) == FUNCTION_DECL
&& asmspec
)
4473 if (DECL_BUILT_IN_CLASS (decl
) == BUILT_IN_NORMAL
)
4474 set_builtin_user_assembler_name (decl
, asmspec
);
4475 set_user_assembler_name (decl
, asmspec
);
4478 /* If #pragma weak was used, mark the decl weak now. */
4479 maybe_apply_pragma_weak (decl
);
4481 /* Output the assembler code and/or RTL code for variables and functions,
4482 unless the type is an undefined structure or union.
4483 If not, it will get done when the type is completed. */
4485 if (TREE_CODE (decl
) == VAR_DECL
|| TREE_CODE (decl
) == FUNCTION_DECL
)
4487 /* Determine the ELF visibility. */
4488 if (TREE_PUBLIC (decl
))
4489 c_determine_visibility (decl
);
4491 /* This is a no-op in c-lang.c or something real in objc-act.c. */
4492 if (c_dialect_objc ())
4493 objc_check_decl (decl
);
4497 /* If this is not a static variable, issue a warning.
4498 It doesn't make any sense to give an ASMSPEC for an
4499 ordinary, non-register local variable. Historically,
4500 GCC has accepted -- but ignored -- the ASMSPEC in
4502 if (!DECL_FILE_SCOPE_P (decl
)
4503 && TREE_CODE (decl
) == VAR_DECL
4504 && !C_DECL_REGISTER (decl
)
4505 && !TREE_STATIC (decl
))
4506 warning (0, "ignoring asm-specifier for non-static local "
4507 "variable %q+D", decl
);
4509 set_user_assembler_name (decl
, asmspec
);
4512 if (DECL_FILE_SCOPE_P (decl
))
4514 if (DECL_INITIAL (decl
) == NULL_TREE
4515 || DECL_INITIAL (decl
) == error_mark_node
)
4516 /* Don't output anything
4517 when a tentative file-scope definition is seen.
4518 But at end of compilation, do output code for them. */
4519 DECL_DEFER_OUTPUT (decl
) = 1;
4520 if (asmspec
&& C_DECL_REGISTER (decl
))
4521 DECL_HARD_REGISTER (decl
) = 1;
4522 rest_of_decl_compilation (decl
, true, 0);
4526 /* In conjunction with an ASMSPEC, the `register'
4527 keyword indicates that we should place the variable
4528 in a particular register. */
4529 if (asmspec
&& C_DECL_REGISTER (decl
))
4531 DECL_HARD_REGISTER (decl
) = 1;
4532 /* This cannot be done for a structure with volatile
4533 fields, on which DECL_REGISTER will have been
4535 if (!DECL_REGISTER (decl
))
4536 error ("cannot put object with volatile field into register");
4539 if (TREE_CODE (decl
) != FUNCTION_DECL
)
4541 /* If we're building a variable sized type, and we might be
4542 reachable other than via the top of the current binding
4543 level, then create a new BIND_EXPR so that we deallocate
4544 the object at the right time. */
4545 /* Note that DECL_SIZE can be null due to errors. */
4546 if (DECL_SIZE (decl
)
4547 && !TREE_CONSTANT (DECL_SIZE (decl
))
4548 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list
))
4551 bind
= build3 (BIND_EXPR
, void_type_node
, NULL
, NULL
, NULL
);
4552 TREE_SIDE_EFFECTS (bind
) = 1;
4554 BIND_EXPR_BODY (bind
) = push_stmt_list ();
4556 add_stmt (build_stmt (DECL_SOURCE_LOCATION (decl
),
4562 if (!DECL_FILE_SCOPE_P (decl
))
4564 /* Recompute the RTL of a local array now
4565 if it used to be an incomplete type. */
4567 && !TREE_STATIC (decl
) && !DECL_EXTERNAL (decl
))
4569 /* If we used it already as memory, it must stay in memory. */
4570 TREE_ADDRESSABLE (decl
) = TREE_USED (decl
);
4571 /* If it's still incomplete now, no init will save it. */
4572 if (DECL_SIZE (decl
) == 0)
4573 DECL_INITIAL (decl
) = 0;
4578 if (TREE_CODE (decl
) == TYPE_DECL
)
4580 if (!DECL_FILE_SCOPE_P (decl
)
4581 && variably_modified_type_p (TREE_TYPE (decl
), NULL_TREE
))
4582 add_stmt (build_stmt (DECL_SOURCE_LOCATION (decl
), DECL_EXPR
, decl
));
4584 rest_of_decl_compilation (decl
, DECL_FILE_SCOPE_P (decl
), 0);
4587 /* Install a cleanup (aka destructor) if one was given. */
4588 if (TREE_CODE (decl
) == VAR_DECL
&& !TREE_STATIC (decl
))
4590 tree attr
= lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl
));
4593 tree cleanup_id
= TREE_VALUE (TREE_VALUE (attr
));
4594 tree cleanup_decl
= lookup_name (cleanup_id
);
4596 vec
<tree
, va_gc
> *v
;
4598 /* Build "cleanup(&decl)" for the destructor. */
4599 cleanup
= build_unary_op (input_location
, ADDR_EXPR
, decl
, 0);
4601 v
->quick_push (cleanup
);
4602 cleanup
= c_build_function_call_vec (DECL_SOURCE_LOCATION (decl
),
4603 vNULL
, cleanup_decl
, v
, NULL
);
4606 /* Don't warn about decl unused; the cleanup uses it. */
4607 TREE_USED (decl
) = 1;
4608 TREE_USED (cleanup_decl
) = 1;
4609 DECL_READ_P (decl
) = 1;
4611 push_cleanup (decl
, cleanup
, false);
4616 && TREE_CODE (decl
) == VAR_DECL
4617 && !DECL_EXTERNAL (decl
)
4618 && DECL_INITIAL (decl
) == NULL_TREE
)
4620 type
= strip_array_types (type
);
4621 if (TREE_READONLY (decl
))
4622 warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wc___compat
,
4623 "uninitialized const %qD is invalid in C++", decl
);
4624 else if ((TREE_CODE (type
) == RECORD_TYPE
4625 || TREE_CODE (type
) == UNION_TYPE
)
4626 && C_TYPE_FIELDS_READONLY (type
))
4627 diagnose_uninitialized_cst_member (decl
, type
);
4630 invoke_plugin_callbacks (PLUGIN_FINISH_DECL
, decl
);
4633 /* Given a parsed parameter declaration, decode it into a PARM_DECL.
4634 EXPR is NULL or a pointer to an expression that needs to be
4635 evaluated for the side effects of array size expressions in the
4639 grokparm (const struct c_parm
*parm
, tree
*expr
)
4641 tree attrs
= parm
->attrs
;
4642 tree decl
= grokdeclarator (parm
->declarator
, parm
->specs
, PARM
, false,
4643 NULL
, &attrs
, expr
, NULL
, DEPRECATED_NORMAL
);
4645 decl_attributes (&decl
, attrs
, 0);
4650 /* Given a parsed parameter declaration, decode it into a PARM_DECL
4651 and push that on the current scope. EXPR is a pointer to an
4652 expression that needs to be evaluated for the side effects of array
4653 size expressions in the parameters. */
4656 push_parm_decl (const struct c_parm
*parm
, tree
*expr
)
4658 tree attrs
= parm
->attrs
;
4661 decl
= grokdeclarator (parm
->declarator
, parm
->specs
, PARM
, false, NULL
,
4662 &attrs
, expr
, NULL
, DEPRECATED_NORMAL
);
4663 decl_attributes (&decl
, attrs
, 0);
4665 decl
= pushdecl (decl
);
4667 finish_decl (decl
, input_location
, NULL_TREE
, NULL_TREE
, NULL_TREE
);
4670 /* Mark all the parameter declarations to date as forward decls.
4671 Also diagnose use of this extension. */
4674 mark_forward_parm_decls (void)
4676 struct c_binding
*b
;
4678 if (pedantic
&& !current_scope
->warned_forward_parm_decls
)
4680 pedwarn (input_location
, OPT_Wpedantic
,
4681 "ISO C forbids forward parameter declarations");
4682 current_scope
->warned_forward_parm_decls
= true;
4685 for (b
= current_scope
->bindings
; b
; b
= b
->prev
)
4686 if (TREE_CODE (b
->decl
) == PARM_DECL
)
4687 TREE_ASM_WRITTEN (b
->decl
) = 1;
4690 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
4691 literal, which may be an incomplete array type completed by the
4692 initializer; INIT is a CONSTRUCTOR at LOC that initializes the compound
4693 literal. NON_CONST is true if the initializers contain something
4694 that cannot occur in a constant expression. */
4697 build_compound_literal (location_t loc
, tree type
, tree init
, bool non_const
)
4699 /* We do not use start_decl here because we have a type, not a declarator;
4700 and do not use finish_decl because the decl should be stored inside
4701 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_EXPR. */
4706 if (type
== error_mark_node
4707 || init
== error_mark_node
)
4708 return error_mark_node
;
4710 decl
= build_decl (loc
, VAR_DECL
, NULL_TREE
, type
);
4711 DECL_EXTERNAL (decl
) = 0;
4712 TREE_PUBLIC (decl
) = 0;
4713 TREE_STATIC (decl
) = (current_scope
== file_scope
);
4714 DECL_CONTEXT (decl
) = current_function_decl
;
4715 TREE_USED (decl
) = 1;
4716 DECL_READ_P (decl
) = 1;
4717 TREE_TYPE (decl
) = type
;
4718 TREE_READONLY (decl
) = (TYPE_READONLY (type
)
4719 || (TREE_CODE (type
) == ARRAY_TYPE
4720 && TYPE_READONLY (TREE_TYPE (type
))));
4721 store_init_value (loc
, decl
, init
, NULL_TREE
);
4723 if (TREE_CODE (type
) == ARRAY_TYPE
&& !COMPLETE_TYPE_P (type
))
4725 int failure
= complete_array_type (&TREE_TYPE (decl
),
4726 DECL_INITIAL (decl
), true);
4727 /* If complete_array_type returns 3, it means that the
4728 initial value of the compound literal is empty. Allow it. */
4729 gcc_assert (failure
== 0 || failure
== 3);
4731 type
= TREE_TYPE (decl
);
4732 TREE_TYPE (DECL_INITIAL (decl
)) = type
;
4735 if (type
== error_mark_node
|| !COMPLETE_TYPE_P (type
))
4737 c_incomplete_type_error (NULL_TREE
, type
);
4738 return error_mark_node
;
4741 stmt
= build_stmt (DECL_SOURCE_LOCATION (decl
), DECL_EXPR
, decl
);
4742 complit
= build1 (COMPOUND_LITERAL_EXPR
, type
, stmt
);
4743 TREE_SIDE_EFFECTS (complit
) = 1;
4745 layout_decl (decl
, 0);
4747 if (TREE_STATIC (decl
))
4749 /* This decl needs a name for the assembler output. */
4750 set_compound_literal_name (decl
);
4751 DECL_DEFER_OUTPUT (decl
) = 1;
4752 DECL_COMDAT (decl
) = 1;
4753 DECL_ARTIFICIAL (decl
) = 1;
4754 DECL_IGNORED_P (decl
) = 1;
4756 rest_of_decl_compilation (decl
, 1, 0);
4761 complit
= build2 (C_MAYBE_CONST_EXPR
, type
, NULL
, complit
);
4762 C_MAYBE_CONST_EXPR_NON_CONST (complit
) = 1;
4768 /* Check the type of a compound literal. Here we just check that it
4769 is valid for C++. */
4772 check_compound_literal_type (location_t loc
, struct c_type_name
*type_name
)
4775 && (type_name
->specs
->typespec_kind
== ctsk_tagdef
4776 || type_name
->specs
->typespec_kind
== ctsk_tagfirstref
))
4777 warning_at (loc
, OPT_Wc___compat
,
4778 "defining a type in a compound literal is invalid in C++");
4781 /* Determine whether TYPE is a structure with a flexible array member,
4782 or a union containing such a structure (possibly recursively). */
4785 flexible_array_type_p (tree type
)
4788 switch (TREE_CODE (type
))
4791 x
= TYPE_FIELDS (type
);
4794 while (DECL_CHAIN (x
) != NULL_TREE
)
4796 if (TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
4797 && TYPE_SIZE (TREE_TYPE (x
)) == NULL_TREE
4798 && TYPE_DOMAIN (TREE_TYPE (x
)) != NULL_TREE
4799 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x
))) == NULL_TREE
)
4803 for (x
= TYPE_FIELDS (type
); x
!= NULL_TREE
; x
= DECL_CHAIN (x
))
4805 if (flexible_array_type_p (TREE_TYPE (x
)))
4814 /* Performs sanity checks on the TYPE and WIDTH of the bit-field NAME,
4815 replacing with appropriate values if they are invalid. */
4817 check_bitfield_type_and_width (tree
*type
, tree
*width
, tree orig_name
)
4820 unsigned int max_width
;
4821 unsigned HOST_WIDE_INT w
;
4822 const char *name
= (orig_name
4823 ? identifier_to_locale (IDENTIFIER_POINTER (orig_name
))
4824 : _("<anonymous>"));
4826 /* Detect and ignore out of range field width and process valid
4828 if (!INTEGRAL_TYPE_P (TREE_TYPE (*width
)))
4830 error ("bit-field %qs width not an integer constant", name
);
4831 *width
= integer_one_node
;
4835 if (TREE_CODE (*width
) != INTEGER_CST
)
4837 *width
= c_fully_fold (*width
, false, NULL
);
4838 if (TREE_CODE (*width
) == INTEGER_CST
)
4839 pedwarn (input_location
, OPT_Wpedantic
,
4840 "bit-field %qs width not an integer constant expression",
4843 if (TREE_CODE (*width
) != INTEGER_CST
)
4845 error ("bit-field %qs width not an integer constant", name
);
4846 *width
= integer_one_node
;
4848 constant_expression_warning (*width
);
4849 if (tree_int_cst_sgn (*width
) < 0)
4851 error ("negative width in bit-field %qs", name
);
4852 *width
= integer_one_node
;
4854 else if (integer_zerop (*width
) && orig_name
)
4856 error ("zero width for bit-field %qs", name
);
4857 *width
= integer_one_node
;
4861 /* Detect invalid bit-field type. */
4862 if (TREE_CODE (*type
) != INTEGER_TYPE
4863 && TREE_CODE (*type
) != BOOLEAN_TYPE
4864 && TREE_CODE (*type
) != ENUMERAL_TYPE
)
4866 error ("bit-field %qs has invalid type", name
);
4867 *type
= unsigned_type_node
;
4870 type_mv
= TYPE_MAIN_VARIANT (*type
);
4871 if (!in_system_header_at (input_location
)
4872 && type_mv
!= integer_type_node
4873 && type_mv
!= unsigned_type_node
4874 && type_mv
!= boolean_type_node
4876 pedwarn (input_location
, OPT_Wpedantic
,
4877 "type of bit-field %qs is a GCC extension", name
);
4879 max_width
= TYPE_PRECISION (*type
);
4881 if (0 < compare_tree_int (*width
, max_width
))
4883 error ("width of %qs exceeds its type", name
);
4885 *width
= build_int_cst (integer_type_node
, w
);
4888 w
= tree_to_uhwi (*width
);
4890 if (TREE_CODE (*type
) == ENUMERAL_TYPE
)
4892 struct lang_type
*lt
= TYPE_LANG_SPECIFIC (*type
);
4894 || w
< tree_int_cst_min_precision (lt
->enum_min
, TYPE_SIGN (*type
))
4895 || w
< tree_int_cst_min_precision (lt
->enum_max
, TYPE_SIGN (*type
)))
4896 warning (0, "%qs is narrower than values of its type", name
);
4902 /* Print warning about variable length array if necessary. */
4905 warn_variable_length_array (tree name
, tree size
)
4907 int const_size
= TREE_CONSTANT (size
);
4909 if (!flag_isoc99
&& pedantic
&& warn_vla
!= 0)
4914 pedwarn (input_location
, OPT_Wvla
,
4915 "ISO C90 forbids array %qE whose size "
4916 "can%'t be evaluated",
4919 pedwarn (input_location
, OPT_Wvla
, "ISO C90 forbids array whose size "
4920 "can%'t be evaluated");
4925 pedwarn (input_location
, OPT_Wvla
,
4926 "ISO C90 forbids variable length array %qE",
4929 pedwarn (input_location
, OPT_Wvla
, "ISO C90 forbids variable length array");
4932 else if (warn_vla
> 0)
4938 "the size of array %qE can"
4939 "%'t be evaluated", name
);
4942 "the size of array can %'t be evaluated");
4948 "variable length array %qE is used",
4952 "variable length array is used");
4957 /* Given declspecs and a declarator,
4958 determine the name and type of the object declared
4959 and construct a ..._DECL node for it.
4960 (In one case we can return a ..._TYPE node instead.
4961 For invalid input we sometimes return 0.)
4963 DECLSPECS is a c_declspecs structure for the declaration specifiers.
4965 DECL_CONTEXT says which syntactic context this declaration is in:
4966 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
4967 FUNCDEF for a function definition. Like NORMAL but a few different
4968 error messages in each case. Return value may be zero meaning
4969 this definition is too screwy to try to parse.
4970 PARM for a parameter declaration (either within a function prototype
4971 or before a function body). Make a PARM_DECL, or return void_type_node.
4972 TYPENAME if for a typename (in a cast or sizeof).
4973 Don't make a DECL node; just return the ..._TYPE node.
4974 FIELD for a struct or union field; make a FIELD_DECL.
4975 INITIALIZED is true if the decl has an initializer.
4976 WIDTH is non-NULL for bit-fields, and is a pointer to an INTEGER_CST node
4977 representing the width of the bit-field.
4978 DECL_ATTRS points to the list of attributes that should be added to this
4979 decl. Any nested attributes that belong on the decl itself will be
4981 If EXPR is not NULL, any expressions that need to be evaluated as
4982 part of evaluating variably modified types will be stored in *EXPR.
4983 If EXPR_CONST_OPERANDS is not NULL, *EXPR_CONST_OPERANDS will be
4984 set to indicate whether operands in *EXPR can be used in constant
4986 DEPRECATED_STATE is a deprecated_states value indicating whether
4987 deprecation warnings should be suppressed.
4989 In the TYPENAME case, DECLARATOR is really an absolute declarator.
4990 It may also be so in the PARM case, for a prototype where the
4991 argument type is specified but not the name.
4993 This function is where the complicated C meanings of `static'
4994 and `extern' are interpreted. */
4997 grokdeclarator (const struct c_declarator
*declarator
,
4998 struct c_declspecs
*declspecs
,
4999 enum decl_context decl_context
, bool initialized
, tree
*width
,
5000 tree
*decl_attrs
, tree
*expr
, bool *expr_const_operands
,
5001 enum deprecated_states deprecated_state
)
5003 tree type
= declspecs
->type
;
5004 bool threadp
= declspecs
->thread_p
;
5005 enum c_storage_class storage_class
= declspecs
->storage_class
;
5010 int type_quals
= TYPE_UNQUALIFIED
;
5011 tree name
= NULL_TREE
;
5012 bool funcdef_flag
= false;
5013 bool funcdef_syntax
= false;
5014 bool size_varies
= false;
5015 tree decl_attr
= declspecs
->decl_attr
;
5016 int array_ptr_quals
= TYPE_UNQUALIFIED
;
5017 tree array_ptr_attrs
= NULL_TREE
;
5018 int array_parm_static
= 0;
5019 bool array_parm_vla_unspec_p
= false;
5020 tree returned_attrs
= NULL_TREE
;
5021 bool bitfield
= width
!= NULL
;
5023 struct c_arg_info
*arg_info
= 0;
5024 addr_space_t as1
, as2
, address_space
;
5025 location_t loc
= UNKNOWN_LOCATION
;
5028 bool expr_const_operands_dummy
;
5029 enum c_declarator_kind first_non_attr_kind
;
5030 unsigned int alignas_align
= 0;
5032 if (TREE_CODE (type
) == ERROR_MARK
)
5033 return error_mark_node
;
5036 if (expr_const_operands
== NULL
)
5037 expr_const_operands
= &expr_const_operands_dummy
;
5039 *expr
= declspecs
->expr
;
5040 *expr_const_operands
= declspecs
->expr_const_operands
;
5042 if (decl_context
== FUNCDEF
)
5043 funcdef_flag
= true, decl_context
= NORMAL
;
5045 /* Look inside a declarator for the name being declared
5046 and get it as an IDENTIFIER_NODE, for an error message. */
5048 const struct c_declarator
*decl
= declarator
;
5050 first_non_attr_kind
= cdk_attrs
;
5060 funcdef_syntax
= (decl
->kind
== cdk_function
);
5061 decl
= decl
->declarator
;
5062 if (first_non_attr_kind
== cdk_attrs
)
5063 first_non_attr_kind
= decl
->kind
;
5067 decl
= decl
->declarator
;
5074 if (first_non_attr_kind
== cdk_attrs
)
5075 first_non_attr_kind
= decl
->kind
;
5084 gcc_assert (decl_context
== PARM
5085 || decl_context
== TYPENAME
5086 || (decl_context
== FIELD
5087 && declarator
->kind
== cdk_id
));
5088 gcc_assert (!initialized
);
5092 /* A function definition's declarator must have the form of
5093 a function declarator. */
5095 if (funcdef_flag
&& !funcdef_syntax
)
5098 /* If this looks like a function definition, make it one,
5099 even if it occurs where parms are expected.
5100 Then store_parm_decls will reject it and not use it as a parm. */
5101 if (decl_context
== NORMAL
&& !funcdef_flag
&& current_scope
->parm_flag
)
5102 decl_context
= PARM
;
5104 if (declspecs
->deprecated_p
&& deprecated_state
!= DEPRECATED_SUPPRESS
)
5105 warn_deprecated_use (declspecs
->type
, declspecs
->decl_attr
);
5107 if ((decl_context
== NORMAL
|| decl_context
== FIELD
)
5108 && current_scope
== file_scope
5109 && variably_modified_type_p (type
, NULL_TREE
))
5112 error_at (loc
, "variably modified %qE at file scope", name
);
5114 error_at (loc
, "variably modified field at file scope");
5115 type
= integer_type_node
;
5118 size_varies
= C_TYPE_VARIABLE_SIZE (type
) != 0;
5120 /* Diagnose defaulting to "int". */
5122 if (declspecs
->default_int_p
&& !in_system_header_at (input_location
))
5124 /* Issue a warning if this is an ISO C 99 program or if
5125 -Wreturn-type and this is a function, or if -Wimplicit;
5126 prefer the former warning since it is more explicit. */
5127 if ((warn_implicit_int
|| warn_return_type
|| flag_isoc99
)
5129 warn_about_return_type
= 1;
5133 pedwarn_c99 (loc
, flag_isoc99
? 0 : OPT_Wimplicit_int
,
5134 "type defaults to %<int%> in declaration of %qE",
5137 pedwarn_c99 (input_location
, flag_isoc99
? 0 : OPT_Wimplicit_int
,
5138 "type defaults to %<int%> in type name");
5142 /* Adjust the type if a bit-field is being declared,
5143 -funsigned-bitfields applied and the type is not explicitly
5145 if (bitfield
&& !flag_signed_bitfields
&& !declspecs
->explicit_signed_p
5146 && TREE_CODE (type
) == INTEGER_TYPE
)
5147 type
= unsigned_type_for (type
);
5149 /* Figure out the type qualifiers for the declaration. There are
5150 two ways a declaration can become qualified. One is something
5151 like `const int i' where the `const' is explicit. Another is
5152 something like `typedef const int CI; CI i' where the type of the
5153 declaration contains the `const'. A third possibility is that
5154 there is a type qualifier on the element type of a typedefed
5155 array type, in which case we should extract that qualifier so
5156 that c_apply_type_quals_to_decl receives the full list of
5157 qualifiers to work with (C90 is not entirely clear about whether
5158 duplicate qualifiers should be diagnosed in this case, but it
5159 seems most appropriate to do so). */
5160 element_type
= strip_array_types (type
);
5161 constp
= declspecs
->const_p
+ TYPE_READONLY (element_type
);
5162 restrictp
= declspecs
->restrict_p
+ TYPE_RESTRICT (element_type
);
5163 volatilep
= declspecs
->volatile_p
+ TYPE_VOLATILE (element_type
);
5164 atomicp
= declspecs
->atomic_p
+ TYPE_ATOMIC (element_type
);
5165 as1
= declspecs
->address_space
;
5166 as2
= TYPE_ADDR_SPACE (element_type
);
5167 address_space
= ADDR_SPACE_GENERIC_P (as1
)? as2
: as1
;
5169 if (pedantic
&& !flag_isoc99
)
5172 pedwarn (loc
, OPT_Wpedantic
, "duplicate %<const%>");
5174 pedwarn (loc
, OPT_Wpedantic
, "duplicate %<restrict%>");
5176 pedwarn (loc
, OPT_Wpedantic
, "duplicate %<volatile%>");
5178 pedwarn (loc
, OPT_Wpedantic
, "duplicate %<_Atomic%>");
5182 if (!ADDR_SPACE_GENERIC_P (as1
) && !ADDR_SPACE_GENERIC_P (as2
) && as1
!= as2
)
5183 error_at (loc
, "conflicting named address spaces (%s vs %s)",
5184 c_addr_space_name (as1
), c_addr_space_name (as2
));
5186 if ((TREE_CODE (type
) == ARRAY_TYPE
5187 || first_non_attr_kind
== cdk_array
)
5188 && TYPE_QUALS (element_type
))
5189 type
= TYPE_MAIN_VARIANT (type
);
5190 type_quals
= ((constp
? TYPE_QUAL_CONST
: 0)
5191 | (restrictp
? TYPE_QUAL_RESTRICT
: 0)
5192 | (volatilep
? TYPE_QUAL_VOLATILE
: 0)
5193 | (atomicp
? TYPE_QUAL_ATOMIC
: 0)
5194 | ENCODE_QUAL_ADDR_SPACE (address_space
));
5196 /* Applying the _Atomic qualifier to an array type (through the use
5197 of typedefs or typeof) must be detected here. If the qualifier
5198 is introduced later, any appearance of applying it to an array is
5199 actually applying it to an element of that array. */
5200 if (atomicp
&& TREE_CODE (type
) == ARRAY_TYPE
)
5201 error_at (loc
, "%<_Atomic%>-qualified array type");
5203 /* Warn about storage classes that are invalid for certain
5204 kinds of declarations (parameters, typenames, etc.). */
5208 || storage_class
== csc_auto
5209 || storage_class
== csc_register
5210 || storage_class
== csc_typedef
))
5212 if (storage_class
== csc_auto
)
5214 (current_scope
== file_scope
) ? 0 : OPT_Wpedantic
,
5215 "function definition declared %<auto%>");
5216 if (storage_class
== csc_register
)
5217 error_at (loc
, "function definition declared %<register%>");
5218 if (storage_class
== csc_typedef
)
5219 error_at (loc
, "function definition declared %<typedef%>");
5221 error_at (loc
, "function definition declared %qs",
5222 declspecs
->thread_gnu_p
? "__thread" : "_Thread_local");
5224 if (storage_class
== csc_auto
5225 || storage_class
== csc_register
5226 || storage_class
== csc_typedef
)
5227 storage_class
= csc_none
;
5229 else if (decl_context
!= NORMAL
&& (storage_class
!= csc_none
|| threadp
))
5231 if (decl_context
== PARM
&& storage_class
== csc_register
)
5235 switch (decl_context
)
5239 error_at (loc
, "storage class specified for structure "
5242 error_at (loc
, "storage class specified for structure field");
5246 error_at (loc
, "storage class specified for parameter %qE",
5249 error_at (loc
, "storage class specified for unnamed parameter");
5252 error_at (loc
, "storage class specified for typename");
5255 storage_class
= csc_none
;
5259 else if (storage_class
== csc_extern
5263 /* 'extern' with initialization is invalid if not at file scope. */
5264 if (current_scope
== file_scope
)
5266 /* It is fine to have 'extern const' when compiling at C
5267 and C++ intersection. */
5268 if (!(warn_cxx_compat
&& constp
))
5269 warning_at (loc
, 0, "%qE initialized and declared %<extern%>",
5273 error_at (loc
, "%qE has both %<extern%> and initializer", name
);
5275 else if (current_scope
== file_scope
)
5277 if (storage_class
== csc_auto
)
5278 error_at (loc
, "file-scope declaration of %qE specifies %<auto%>",
5280 if (pedantic
&& storage_class
== csc_register
)
5281 pedwarn (input_location
, OPT_Wpedantic
,
5282 "file-scope declaration of %qE specifies %<register%>", name
);
5286 if (storage_class
== csc_extern
&& funcdef_flag
)
5287 error_at (loc
, "nested function %qE declared %<extern%>", name
);
5288 else if (threadp
&& storage_class
== csc_none
)
5290 error_at (loc
, "function-scope %qE implicitly auto and declared "
5292 declspecs
->thread_gnu_p
? "__thread" : "_Thread_local");
5297 /* Now figure out the structure of the declarator proper.
5298 Descend through it, creating more complex types, until we reach
5299 the declared identifier (or NULL_TREE, in an absolute declarator).
5300 At each stage we maintain an unqualified version of the type
5301 together with any qualifiers that should be applied to it with
5302 c_build_qualified_type; this way, array types including
5303 multidimensional array types are first built up in unqualified
5304 form and then the qualified form is created with
5305 TYPE_MAIN_VARIANT pointing to the unqualified form. */
5307 while (declarator
&& declarator
->kind
!= cdk_id
)
5309 if (type
== error_mark_node
)
5311 declarator
= declarator
->declarator
;
5315 /* Each level of DECLARATOR is either a cdk_array (for ...[..]),
5316 a cdk_pointer (for *...),
5317 a cdk_function (for ...(...)),
5318 a cdk_attrs (for nested attributes),
5319 or a cdk_id (for the name being declared
5320 or the place in an absolute declarator
5321 where the name was omitted).
5322 For the last case, we have just exited the loop.
5324 At this point, TYPE is the type of elements of an array,
5325 or for a function to return, or for a pointer to point to.
5326 After this sequence of ifs, TYPE is the type of the
5327 array or function or pointer, and DECLARATOR has had its
5328 outermost layer removed. */
5330 if (array_ptr_quals
!= TYPE_UNQUALIFIED
5331 || array_ptr_attrs
!= NULL_TREE
5332 || array_parm_static
)
5334 /* Only the innermost declarator (making a parameter be of
5335 array type which is converted to pointer type)
5336 may have static or type qualifiers. */
5337 error_at (loc
, "static or type qualifiers in non-parameter array declarator");
5338 array_ptr_quals
= TYPE_UNQUALIFIED
;
5339 array_ptr_attrs
= NULL_TREE
;
5340 array_parm_static
= 0;
5343 switch (declarator
->kind
)
5347 /* A declarator with embedded attributes. */
5348 tree attrs
= declarator
->u
.attrs
;
5349 const struct c_declarator
*inner_decl
;
5351 declarator
= declarator
->declarator
;
5352 inner_decl
= declarator
;
5353 while (inner_decl
->kind
== cdk_attrs
)
5354 inner_decl
= inner_decl
->declarator
;
5355 if (inner_decl
->kind
== cdk_id
)
5356 attr_flags
|= (int) ATTR_FLAG_DECL_NEXT
;
5357 else if (inner_decl
->kind
== cdk_function
)
5358 attr_flags
|= (int) ATTR_FLAG_FUNCTION_NEXT
;
5359 else if (inner_decl
->kind
== cdk_array
)
5360 attr_flags
|= (int) ATTR_FLAG_ARRAY_NEXT
;
5361 returned_attrs
= decl_attributes (&type
,
5362 chainon (returned_attrs
, attrs
),
5368 tree itype
= NULL_TREE
;
5369 tree size
= declarator
->u
.array
.dimen
;
5370 /* The index is a signed object `sizetype' bits wide. */
5371 tree index_type
= c_common_signed_type (sizetype
);
5373 array_ptr_quals
= declarator
->u
.array
.quals
;
5374 array_ptr_attrs
= declarator
->u
.array
.attrs
;
5375 array_parm_static
= declarator
->u
.array
.static_p
;
5376 array_parm_vla_unspec_p
= declarator
->u
.array
.vla_unspec_p
;
5378 declarator
= declarator
->declarator
;
5380 /* Check for some types that there cannot be arrays of. */
5382 if (VOID_TYPE_P (type
))
5385 error_at (loc
, "declaration of %qE as array of voids", name
);
5387 error_at (loc
, "declaration of type name as array of voids");
5388 type
= error_mark_node
;
5391 if (TREE_CODE (type
) == FUNCTION_TYPE
)
5394 error_at (loc
, "declaration of %qE as array of functions",
5397 error_at (loc
, "declaration of type name as array of "
5399 type
= error_mark_node
;
5402 if (pedantic
&& !in_system_header_at (input_location
)
5403 && flexible_array_type_p (type
))
5404 pedwarn (loc
, OPT_Wpedantic
,
5405 "invalid use of structure with flexible array member");
5407 if (size
== error_mark_node
)
5408 type
= error_mark_node
;
5410 if (type
== error_mark_node
)
5413 /* If size was specified, set ITYPE to a range-type for
5414 that size. Otherwise, ITYPE remains null. finish_decl
5415 may figure it out from an initial value. */
5419 bool size_maybe_const
= true;
5420 bool size_int_const
= (TREE_CODE (size
) == INTEGER_CST
5421 && !TREE_OVERFLOW (size
));
5422 bool this_size_varies
= false;
5424 /* Strip NON_LVALUE_EXPRs since we aren't using as an
5426 STRIP_TYPE_NOPS (size
);
5428 if (!INTEGRAL_TYPE_P (TREE_TYPE (size
)))
5431 error_at (loc
, "size of array %qE has non-integer type",
5435 "size of unnamed array has non-integer type");
5436 size
= integer_one_node
;
5439 size
= c_fully_fold (size
, false, &size_maybe_const
);
5441 if (pedantic
&& size_maybe_const
&& integer_zerop (size
))
5444 pedwarn (loc
, OPT_Wpedantic
,
5445 "ISO C forbids zero-size array %qE", name
);
5447 pedwarn (loc
, OPT_Wpedantic
,
5448 "ISO C forbids zero-size array");
5451 if (TREE_CODE (size
) == INTEGER_CST
&& size_maybe_const
)
5453 constant_expression_warning (size
);
5454 if (tree_int_cst_sgn (size
) < 0)
5457 error_at (loc
, "size of array %qE is negative", name
);
5459 error_at (loc
, "size of unnamed array is negative");
5460 size
= integer_one_node
;
5462 /* Handle a size folded to an integer constant but
5463 not an integer constant expression. */
5464 if (!size_int_const
)
5466 /* If this is a file scope declaration of an
5467 ordinary identifier, this is invalid code;
5468 diagnosing it here and not subsequently
5469 treating the type as variable-length avoids
5470 more confusing diagnostics later. */
5471 if ((decl_context
== NORMAL
|| decl_context
== FIELD
)
5472 && current_scope
== file_scope
)
5473 pedwarn (input_location
, 0,
5474 "variably modified %qE at file scope",
5477 this_size_varies
= size_varies
= true;
5478 warn_variable_length_array (name
, size
);
5481 else if ((decl_context
== NORMAL
|| decl_context
== FIELD
)
5482 && current_scope
== file_scope
)
5484 error_at (loc
, "variably modified %qE at file scope", name
);
5485 size
= integer_one_node
;
5489 /* Make sure the array size remains visibly
5490 nonconstant even if it is (eg) a const variable
5491 with known value. */
5492 this_size_varies
= size_varies
= true;
5493 warn_variable_length_array (name
, size
);
5494 if (flag_sanitize
& SANITIZE_VLA
5495 && decl_context
== NORMAL
)
5497 /* Evaluate the array size only once. */
5498 size
= c_save_expr (size
);
5499 size
= c_fully_fold (size
, false, NULL
);
5500 size
= fold_build2 (COMPOUND_EXPR
, TREE_TYPE (size
),
5501 ubsan_instrument_vla (loc
, size
),
5506 if (integer_zerop (size
) && !this_size_varies
)
5508 /* A zero-length array cannot be represented with
5509 an unsigned index type, which is what we'll
5510 get with build_index_type. Create an
5511 open-ended range instead. */
5512 itype
= build_range_type (sizetype
, size
, NULL_TREE
);
5516 /* Arrange for the SAVE_EXPR on the inside of the
5517 MINUS_EXPR, which allows the -1 to get folded
5518 with the +1 that happens when building TYPE_SIZE. */
5520 size
= save_expr (size
);
5521 if (this_size_varies
&& TREE_CODE (size
) == INTEGER_CST
)
5522 size
= build2 (COMPOUND_EXPR
, TREE_TYPE (size
),
5523 integer_zero_node
, size
);
5525 /* Compute the maximum valid index, that is, size
5526 - 1. Do the calculation in index_type, so that
5527 if it is a variable the computations will be
5528 done in the proper mode. */
5529 itype
= fold_build2_loc (loc
, MINUS_EXPR
, index_type
,
5530 convert (index_type
, size
),
5531 convert (index_type
,
5534 /* The above overflows when size does not fit
5536 ??? While a size of INT_MAX+1 technically shouldn't
5537 cause an overflow (because we subtract 1), handling
5538 this case seems like an unnecessary complication. */
5539 if (TREE_CODE (size
) == INTEGER_CST
5540 && !int_fits_type_p (size
, index_type
))
5543 error_at (loc
, "size of array %qE is too large",
5546 error_at (loc
, "size of unnamed array is too large");
5547 type
= error_mark_node
;
5551 itype
= build_index_type (itype
);
5553 if (this_size_varies
)
5556 *expr
= build2 (COMPOUND_EXPR
, TREE_TYPE (size
),
5560 *expr_const_operands
&= size_maybe_const
;
5563 else if (decl_context
== FIELD
)
5565 bool flexible_array_member
= false;
5566 if (array_parm_vla_unspec_p
)
5567 /* Field names can in fact have function prototype
5568 scope so [*] is disallowed here through making
5569 the field variably modified, not through being
5570 something other than a declaration with function
5575 const struct c_declarator
*t
= declarator
;
5576 while (t
->kind
== cdk_attrs
)
5578 flexible_array_member
= (t
->kind
== cdk_id
);
5580 if (flexible_array_member
5581 && pedantic
&& !flag_isoc99
5582 && !in_system_header_at (input_location
))
5583 pedwarn (loc
, OPT_Wpedantic
,
5584 "ISO C90 does not support flexible array members");
5586 /* ISO C99 Flexible array members are effectively
5587 identical to GCC's zero-length array extension. */
5588 if (flexible_array_member
|| array_parm_vla_unspec_p
)
5589 itype
= build_range_type (sizetype
, size_zero_node
,
5592 else if (decl_context
== PARM
)
5594 if (array_parm_vla_unspec_p
)
5596 itype
= build_range_type (sizetype
, size_zero_node
, NULL_TREE
);
5600 else if (decl_context
== TYPENAME
)
5602 if (array_parm_vla_unspec_p
)
5605 warning (0, "%<[*]%> not in a declaration");
5606 /* We use this to avoid messing up with incomplete
5607 array types of the same type, that would
5608 otherwise be modified below. */
5609 itype
= build_range_type (sizetype
, size_zero_node
,
5615 /* Complain about arrays of incomplete types. */
5616 if (!COMPLETE_TYPE_P (type
))
5618 error_at (loc
, "array type has incomplete element type");
5619 type
= error_mark_node
;
5622 /* When itype is NULL, a shared incomplete array type is
5623 returned for all array of a given type. Elsewhere we
5624 make sure we don't complete that type before copying
5625 it, but here we want to make sure we don't ever
5626 modify the shared type, so we gcc_assert (itype)
5629 addr_space_t as
= DECODE_QUAL_ADDR_SPACE (type_quals
);
5630 if (!ADDR_SPACE_GENERIC_P (as
) && as
!= TYPE_ADDR_SPACE (type
))
5631 type
= build_qualified_type (type
,
5632 ENCODE_QUAL_ADDR_SPACE (as
));
5634 type
= build_array_type (type
, itype
);
5637 if (type
!= error_mark_node
)
5641 /* It is ok to modify type here even if itype is
5642 NULL: if size_varies, we're in a
5643 multi-dimensional array and the inner type has
5644 variable size, so the enclosing shared array type
5646 if (size
&& TREE_CODE (size
) == INTEGER_CST
)
5648 = build_distinct_type_copy (TYPE_MAIN_VARIANT (type
));
5649 C_TYPE_VARIABLE_SIZE (type
) = 1;
5652 /* The GCC extension for zero-length arrays differs from
5653 ISO flexible array members in that sizeof yields
5655 if (size
&& integer_zerop (size
))
5658 type
= build_distinct_type_copy (TYPE_MAIN_VARIANT (type
));
5659 TYPE_SIZE (type
) = bitsize_zero_node
;
5660 TYPE_SIZE_UNIT (type
) = size_zero_node
;
5661 SET_TYPE_STRUCTURAL_EQUALITY (type
);
5663 if (array_parm_vla_unspec_p
)
5666 /* The type is complete. C99 6.7.5.2p4 */
5667 type
= build_distinct_type_copy (TYPE_MAIN_VARIANT (type
));
5668 TYPE_SIZE (type
) = bitsize_zero_node
;
5669 TYPE_SIZE_UNIT (type
) = size_zero_node
;
5670 SET_TYPE_STRUCTURAL_EQUALITY (type
);
5674 if (decl_context
!= PARM
5675 && (array_ptr_quals
!= TYPE_UNQUALIFIED
5676 || array_ptr_attrs
!= NULL_TREE
5677 || array_parm_static
))
5679 error_at (loc
, "static or type qualifiers in non-parameter array declarator");
5680 array_ptr_quals
= TYPE_UNQUALIFIED
;
5681 array_ptr_attrs
= NULL_TREE
;
5682 array_parm_static
= 0;
5688 /* Say it's a definition only for the declarator closest
5689 to the identifier, apart possibly from some
5691 bool really_funcdef
= false;
5695 const struct c_declarator
*t
= declarator
->declarator
;
5696 while (t
->kind
== cdk_attrs
)
5698 really_funcdef
= (t
->kind
== cdk_id
);
5701 /* Declaring a function type. Make sure we have a valid
5702 type for the function to return. */
5703 if (type
== error_mark_node
)
5706 size_varies
= false;
5708 /* Warn about some types functions can't return. */
5709 if (TREE_CODE (type
) == FUNCTION_TYPE
)
5712 error_at (loc
, "%qE declared as function returning a "
5715 error_at (loc
, "type name declared as function "
5716 "returning a function");
5717 type
= integer_type_node
;
5719 if (TREE_CODE (type
) == ARRAY_TYPE
)
5722 error_at (loc
, "%qE declared as function returning an array",
5725 error_at (loc
, "type name declared as function returning "
5727 type
= integer_type_node
;
5729 errmsg
= targetm
.invalid_return_type (type
);
5733 type
= integer_type_node
;
5736 /* Construct the function type and go to the next
5737 inner layer of declarator. */
5738 arg_info
= declarator
->u
.arg_info
;
5739 arg_types
= grokparms (arg_info
, really_funcdef
);
5741 /* Type qualifiers before the return type of the function
5742 qualify the return type, not the function type. */
5745 /* Type qualifiers on a function return type are
5746 normally permitted by the standard but have no
5747 effect, so give a warning at -Wreturn-type.
5748 Qualifiers on a void return type are banned on
5749 function definitions in ISO C; GCC used to used
5750 them for noreturn functions. */
5751 if (VOID_TYPE_P (type
) && really_funcdef
)
5753 "function definition has qualified void return type");
5755 warning_at (loc
, OPT_Wignored_qualifiers
,
5756 "type qualifiers ignored on function return type");
5758 type
= c_build_qualified_type (type
, type_quals
);
5760 type_quals
= TYPE_UNQUALIFIED
;
5762 type
= build_function_type (type
, arg_types
);
5763 declarator
= declarator
->declarator
;
5765 /* Set the TYPE_CONTEXTs for each tagged type which is local to
5766 the formal parameter list of this FUNCTION_TYPE to point to
5767 the FUNCTION_TYPE node itself. */
5772 FOR_EACH_VEC_SAFE_ELT_REVERSE (arg_info
->tags
, ix
, tag
)
5773 TYPE_CONTEXT (tag
->type
) = type
;
5779 /* Merge any constancy or volatility into the target type
5781 if ((type_quals
& TYPE_QUAL_ATOMIC
)
5782 && TREE_CODE (type
) == FUNCTION_TYPE
)
5785 "%<_Atomic%>-qualified function type");
5786 type_quals
&= ~TYPE_QUAL_ATOMIC
;
5788 else if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
5790 pedwarn (loc
, OPT_Wpedantic
,
5791 "ISO C forbids qualified function types");
5793 type
= c_build_qualified_type (type
, type_quals
);
5794 size_varies
= false;
5796 /* When the pointed-to type involves components of variable size,
5797 care must be taken to ensure that the size evaluation code is
5798 emitted early enough to dominate all the possible later uses
5799 and late enough for the variables on which it depends to have
5802 This is expected to happen automatically when the pointed-to
5803 type has a name/declaration of it's own, but special attention
5804 is required if the type is anonymous.
5806 We handle the NORMAL and FIELD contexts here by attaching an
5807 artificial TYPE_DECL to such pointed-to type. This forces the
5808 sizes evaluation at a safe point and ensures it is not deferred
5809 until e.g. within a deeper conditional context.
5811 We expect nothing to be needed here for PARM or TYPENAME.
5812 Pushing a TYPE_DECL at this point for TYPENAME would actually
5813 be incorrect, as we might be in the middle of an expression
5814 with side effects on the pointed-to type size "arguments" prior
5815 to the pointer declaration point and the fake TYPE_DECL in the
5816 enclosing context would force the size evaluation prior to the
5819 if (!TYPE_NAME (type
)
5820 && (decl_context
== NORMAL
|| decl_context
== FIELD
)
5821 && variably_modified_type_p (type
, NULL_TREE
))
5823 tree decl
= build_decl (loc
, TYPE_DECL
, NULL_TREE
, type
);
5824 DECL_ARTIFICIAL (decl
) = 1;
5826 finish_decl (decl
, loc
, NULL_TREE
, NULL_TREE
, NULL_TREE
);
5827 TYPE_NAME (type
) = decl
;
5830 type
= c_build_pointer_type (type
);
5832 /* Process type qualifiers (such as const or volatile)
5833 that were given inside the `*'. */
5834 type_quals
= declarator
->u
.pointer_quals
;
5836 declarator
= declarator
->declarator
;
5843 *decl_attrs
= chainon (returned_attrs
, *decl_attrs
);
5845 /* Now TYPE has the actual type, apart from any qualifiers in
5848 /* Warn about address space used for things other than static memory or
5850 address_space
= DECODE_QUAL_ADDR_SPACE (type_quals
);
5851 if (!ADDR_SPACE_GENERIC_P (address_space
))
5853 if (decl_context
== NORMAL
)
5855 switch (storage_class
)
5858 error ("%qs combined with %<auto%> qualifier for %qE",
5859 c_addr_space_name (address_space
), name
);
5862 error ("%qs combined with %<register%> qualifier for %qE",
5863 c_addr_space_name (address_space
), name
);
5866 if (current_function_scope
)
5868 error ("%qs specified for auto variable %qE",
5869 c_addr_space_name (address_space
), name
);
5881 else if (decl_context
== PARM
&& TREE_CODE (type
) != ARRAY_TYPE
)
5884 error ("%qs specified for parameter %qE",
5885 c_addr_space_name (address_space
), name
);
5887 error ("%qs specified for unnamed parameter",
5888 c_addr_space_name (address_space
));
5890 else if (decl_context
== FIELD
)
5893 error ("%qs specified for structure field %qE",
5894 c_addr_space_name (address_space
), name
);
5896 error ("%qs specified for structure field",
5897 c_addr_space_name (address_space
));
5901 /* Check the type and width of a bit-field. */
5904 check_bitfield_type_and_width (&type
, width
, name
);
5905 /* C11 makes it implementation-defined (6.7.2.1#5) whether
5906 atomic types are permitted for bit-fields; we have no code to
5907 make bit-field accesses atomic, so disallow them. */
5908 if (type_quals
& TYPE_QUAL_ATOMIC
)
5911 error ("bit-field %qE has atomic type", name
);
5913 error ("bit-field has atomic type");
5914 type_quals
&= ~TYPE_QUAL_ATOMIC
;
5918 /* Reject invalid uses of _Alignas. */
5919 if (declspecs
->alignas_p
)
5921 if (storage_class
== csc_typedef
)
5922 error_at (loc
, "alignment specified for typedef %qE", name
);
5923 else if (storage_class
== csc_register
)
5924 error_at (loc
, "alignment specified for %<register%> object %qE",
5926 else if (decl_context
== PARM
)
5929 error_at (loc
, "alignment specified for parameter %qE", name
);
5931 error_at (loc
, "alignment specified for unnamed parameter");
5936 error_at (loc
, "alignment specified for bit-field %qE", name
);
5938 error_at (loc
, "alignment specified for unnamed bit-field");
5940 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
5941 error_at (loc
, "alignment specified for function %qE", name
);
5942 else if (declspecs
->align_log
!= -1)
5944 alignas_align
= 1U << declspecs
->align_log
;
5945 if (alignas_align
< min_align_of_type (type
))
5948 error_at (loc
, "%<_Alignas%> specifiers cannot reduce "
5949 "alignment of %qE", name
);
5951 error_at (loc
, "%<_Alignas%> specifiers cannot reduce "
5952 "alignment of unnamed field");
5958 /* Did array size calculations overflow or does the array cover more
5959 than half of the address-space? */
5960 if (TREE_CODE (type
) == ARRAY_TYPE
5961 && COMPLETE_TYPE_P (type
)
5962 && TREE_CODE (TYPE_SIZE_UNIT (type
)) == INTEGER_CST
5963 && ! valid_constant_size_p (TYPE_SIZE_UNIT (type
)))
5966 error_at (loc
, "size of array %qE is too large", name
);
5968 error_at (loc
, "size of unnamed array is too large");
5969 /* If we proceed with the array type as it is, we'll eventually
5970 crash in tree_to_[su]hwi(). */
5971 type
= error_mark_node
;
5974 /* If this is declaring a typedef name, return a TYPE_DECL. */
5976 if (storage_class
== csc_typedef
)
5979 if ((type_quals
& TYPE_QUAL_ATOMIC
)
5980 && TREE_CODE (type
) == FUNCTION_TYPE
)
5983 "%<_Atomic%>-qualified function type");
5984 type_quals
&= ~TYPE_QUAL_ATOMIC
;
5986 else if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
5988 pedwarn (loc
, OPT_Wpedantic
,
5989 "ISO C forbids qualified function types");
5991 type
= c_build_qualified_type (type
, type_quals
);
5992 decl
= build_decl (declarator
->id_loc
,
5993 TYPE_DECL
, declarator
->u
.id
, type
);
5994 if (declspecs
->explicit_signed_p
)
5995 C_TYPEDEF_EXPLICITLY_SIGNED (decl
) = 1;
5996 if (declspecs
->inline_p
)
5997 pedwarn (loc
, 0,"typedef %q+D declared %<inline%>", decl
);
5998 if (declspecs
->noreturn_p
)
5999 pedwarn (loc
, 0,"typedef %q+D declared %<_Noreturn%>", decl
);
6001 if (warn_cxx_compat
&& declarator
->u
.id
!= NULL_TREE
)
6003 struct c_binding
*b
= I_TAG_BINDING (declarator
->u
.id
);
6006 && b
->decl
!= NULL_TREE
6007 && (B_IN_CURRENT_SCOPE (b
)
6008 || (current_scope
== file_scope
&& B_IN_EXTERNAL_SCOPE (b
)))
6009 && TYPE_MAIN_VARIANT (b
->decl
) != TYPE_MAIN_VARIANT (type
))
6011 warning_at (declarator
->id_loc
, OPT_Wc___compat
,
6012 ("using %qD as both a typedef and a tag is "
6015 if (b
->locus
!= UNKNOWN_LOCATION
)
6016 inform (b
->locus
, "originally defined here");
6023 /* If this is a type name (such as, in a cast or sizeof),
6024 compute the type and return it now. */
6026 if (decl_context
== TYPENAME
)
6028 /* Note that the grammar rejects storage classes in typenames
6030 gcc_assert (storage_class
== csc_none
&& !threadp
6031 && !declspecs
->inline_p
&& !declspecs
->noreturn_p
);
6032 if ((type_quals
& TYPE_QUAL_ATOMIC
)
6033 && TREE_CODE (type
) == FUNCTION_TYPE
)
6036 "%<_Atomic%>-qualified function type");
6037 type_quals
&= ~TYPE_QUAL_ATOMIC
;
6039 else if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
6041 pedwarn (loc
, OPT_Wpedantic
,
6042 "ISO C forbids const or volatile function types");
6044 type
= c_build_qualified_type (type
, type_quals
);
6048 if (pedantic
&& decl_context
== FIELD
6049 && variably_modified_type_p (type
, NULL_TREE
))
6052 pedwarn (loc
, OPT_Wpedantic
, "a member of a structure or union cannot "
6053 "have a variably modified type");
6056 /* Aside from typedefs and type names (handle above),
6057 `void' at top level (not within pointer)
6058 is allowed only in public variables.
6059 We don't complain about parms either, but that is because
6060 a better error message can be made later. */
6062 if (VOID_TYPE_P (type
) && decl_context
!= PARM
6063 && !((decl_context
!= FIELD
&& TREE_CODE (type
) != FUNCTION_TYPE
)
6064 && (storage_class
== csc_extern
6065 || (current_scope
== file_scope
6066 && !(storage_class
== csc_static
6067 || storage_class
== csc_register
)))))
6069 error_at (loc
, "variable or field %qE declared void", name
);
6070 type
= integer_type_node
;
6073 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
6074 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
6079 if (decl_context
== PARM
)
6083 /* A parameter declared as an array of T is really a pointer to T.
6084 One declared as a function is really a pointer to a function. */
6086 if (TREE_CODE (type
) == ARRAY_TYPE
)
6088 /* Transfer const-ness of array into that of type pointed to. */
6089 type
= TREE_TYPE (type
);
6091 type
= c_build_qualified_type (type
, type_quals
);
6092 type
= c_build_pointer_type (type
);
6093 type_quals
= array_ptr_quals
;
6095 type
= c_build_qualified_type (type
, type_quals
);
6097 /* We don't yet implement attributes in this context. */
6098 if (array_ptr_attrs
!= NULL_TREE
)
6099 warning_at (loc
, OPT_Wattributes
,
6100 "attributes in parameter array declarator ignored");
6102 size_varies
= false;
6104 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
6106 if (type_quals
& TYPE_QUAL_ATOMIC
)
6109 "%<_Atomic%>-qualified function type");
6110 type_quals
&= ~TYPE_QUAL_ATOMIC
;
6112 else if (type_quals
)
6113 pedwarn (loc
, OPT_Wpedantic
,
6114 "ISO C forbids qualified function types");
6116 type
= c_build_qualified_type (type
, type_quals
);
6117 type
= c_build_pointer_type (type
);
6118 type_quals
= TYPE_UNQUALIFIED
;
6120 else if (type_quals
)
6121 type
= c_build_qualified_type (type
, type_quals
);
6123 decl
= build_decl (declarator
->id_loc
,
6124 PARM_DECL
, declarator
->u
.id
, type
);
6126 C_DECL_VARIABLE_SIZE (decl
) = 1;
6128 /* Compute the type actually passed in the parmlist,
6129 for the case where there is no prototype.
6130 (For example, shorts and chars are passed as ints.)
6131 When there is a prototype, this is overridden later. */
6133 if (type
== error_mark_node
)
6134 promoted_type
= type
;
6136 promoted_type
= c_type_promotes_to (type
);
6138 DECL_ARG_TYPE (decl
) = promoted_type
;
6139 if (declspecs
->inline_p
)
6140 pedwarn (loc
, 0, "parameter %q+D declared %<inline%>", decl
);
6141 if (declspecs
->noreturn_p
)
6142 pedwarn (loc
, 0, "parameter %q+D declared %<_Noreturn%>", decl
);
6144 else if (decl_context
== FIELD
)
6146 /* Note that the grammar rejects storage classes in typenames
6148 gcc_assert (storage_class
== csc_none
&& !threadp
6149 && !declspecs
->inline_p
&& !declspecs
->noreturn_p
);
6151 /* Structure field. It may not be a function. */
6153 if (TREE_CODE (type
) == FUNCTION_TYPE
)
6155 error_at (loc
, "field %qE declared as a function", name
);
6156 type
= build_pointer_type (type
);
6158 else if (TREE_CODE (type
) != ERROR_MARK
6159 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type
))
6162 error_at (loc
, "field %qE has incomplete type", name
);
6164 error_at (loc
, "unnamed field has incomplete type");
6165 type
= error_mark_node
;
6167 type
= c_build_qualified_type (type
, type_quals
);
6168 decl
= build_decl (declarator
->id_loc
,
6169 FIELD_DECL
, declarator
->u
.id
, type
);
6170 DECL_NONADDRESSABLE_P (decl
) = bitfield
;
6171 if (bitfield
&& !declarator
->u
.id
)
6172 TREE_NO_WARNING (decl
) = 1;
6175 C_DECL_VARIABLE_SIZE (decl
) = 1;
6177 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
6179 if (storage_class
== csc_register
|| threadp
)
6181 error_at (loc
, "invalid storage class for function %qE", name
);
6183 else if (current_scope
!= file_scope
)
6185 /* Function declaration not at file scope. Storage
6186 classes other than `extern' are not allowed, C99
6187 6.7.1p5, and `extern' makes no difference. However,
6188 GCC allows 'auto', perhaps with 'inline', to support
6189 nested functions. */
6190 if (storage_class
== csc_auto
)
6191 pedwarn (loc
, OPT_Wpedantic
,
6192 "invalid storage class for function %qE", name
);
6193 else if (storage_class
== csc_static
)
6195 error_at (loc
, "invalid storage class for function %qE", name
);
6197 storage_class
= declspecs
->storage_class
= csc_none
;
6203 decl
= build_decl (declarator
->id_loc
,
6204 FUNCTION_DECL
, declarator
->u
.id
, type
);
6205 decl
= build_decl_attribute_variant (decl
, decl_attr
);
6207 if (type_quals
& TYPE_QUAL_ATOMIC
)
6210 "%<_Atomic%>-qualified function type");
6211 type_quals
&= ~TYPE_QUAL_ATOMIC
;
6213 else if (pedantic
&& type_quals
&& !DECL_IN_SYSTEM_HEADER (decl
))
6214 pedwarn (loc
, OPT_Wpedantic
,
6215 "ISO C forbids qualified function types");
6217 /* Every function declaration is an external reference
6218 (DECL_EXTERNAL) except for those which are not at file
6219 scope and are explicitly declared "auto". This is
6220 forbidden by standard C (C99 6.7.1p5) and is interpreted by
6221 GCC to signify a forward declaration of a nested function. */
6222 if (storage_class
== csc_auto
&& current_scope
!= file_scope
)
6223 DECL_EXTERNAL (decl
) = 0;
6224 /* In C99, a function which is declared 'inline' with 'extern'
6225 is not an external reference (which is confusing). It
6226 means that the later definition of the function must be output
6227 in this file, C99 6.7.4p6. In GNU C89, a function declared
6228 'extern inline' is an external reference. */
6229 else if (declspecs
->inline_p
&& storage_class
!= csc_static
)
6230 DECL_EXTERNAL (decl
) = ((storage_class
== csc_extern
)
6231 == flag_gnu89_inline
);
6233 DECL_EXTERNAL (decl
) = !initialized
;
6235 /* Record absence of global scope for `static' or `auto'. */
6237 = !(storage_class
== csc_static
|| storage_class
== csc_auto
);
6239 /* For a function definition, record the argument information
6240 block where store_parm_decls will look for it. */
6242 current_function_arg_info
= arg_info
;
6244 if (declspecs
->default_int_p
)
6245 C_FUNCTION_IMPLICIT_INT (decl
) = 1;
6247 /* Record presence of `inline' and `_Noreturn', if it is
6249 if (flag_hosted
&& MAIN_NAME_P (declarator
->u
.id
))
6251 if (declspecs
->inline_p
)
6252 pedwarn (loc
, 0, "cannot inline function %<main%>");
6253 if (declspecs
->noreturn_p
)
6254 pedwarn (loc
, 0, "%<main%> declared %<_Noreturn%>");
6258 if (declspecs
->inline_p
)
6259 /* Record that the function is declared `inline'. */
6260 DECL_DECLARED_INLINE_P (decl
) = 1;
6261 if (declspecs
->noreturn_p
)
6266 pedwarn (loc
, OPT_Wpedantic
,
6267 "ISO C99 does not support %<_Noreturn%>");
6269 pedwarn (loc
, OPT_Wpedantic
,
6270 "ISO C90 does not support %<_Noreturn%>");
6272 TREE_THIS_VOLATILE (decl
) = 1;
6278 /* It's a variable. */
6279 /* An uninitialized decl with `extern' is a reference. */
6280 int extern_ref
= !initialized
&& storage_class
== csc_extern
;
6282 type
= c_build_qualified_type (type
, type_quals
);
6284 /* C99 6.2.2p7: It is invalid (compile-time undefined
6285 behavior) to create an 'extern' declaration for a
6286 variable if there is a global declaration that is
6287 'static' and the global declaration is not visible.
6288 (If the static declaration _is_ currently visible,
6289 the 'extern' declaration is taken to refer to that decl.) */
6290 if (extern_ref
&& current_scope
!= file_scope
)
6292 tree global_decl
= identifier_global_value (declarator
->u
.id
);
6293 tree visible_decl
= lookup_name (declarator
->u
.id
);
6296 && global_decl
!= visible_decl
6297 && TREE_CODE (global_decl
) == VAR_DECL
6298 && !TREE_PUBLIC (global_decl
))
6299 error_at (loc
, "variable previously declared %<static%> "
6300 "redeclared %<extern%>");
6303 decl
= build_decl (declarator
->id_loc
,
6304 VAR_DECL
, declarator
->u
.id
, type
);
6306 C_DECL_VARIABLE_SIZE (decl
) = 1;
6308 if (declspecs
->inline_p
)
6309 pedwarn (loc
, 0, "variable %q+D declared %<inline%>", decl
);
6310 if (declspecs
->noreturn_p
)
6311 pedwarn (loc
, 0, "variable %q+D declared %<_Noreturn%>", decl
);
6313 /* At file scope, an initialized extern declaration may follow
6314 a static declaration. In that case, DECL_EXTERNAL will be
6315 reset later in start_decl. */
6316 DECL_EXTERNAL (decl
) = (storage_class
== csc_extern
);
6318 /* At file scope, the presence of a `static' or `register' storage
6319 class specifier, or the absence of all storage class specifiers
6320 makes this declaration a definition (perhaps tentative). Also,
6321 the absence of `static' makes it public. */
6322 if (current_scope
== file_scope
)
6324 TREE_PUBLIC (decl
) = storage_class
!= csc_static
;
6325 TREE_STATIC (decl
) = !extern_ref
;
6327 /* Not at file scope, only `static' makes a static definition. */
6330 TREE_STATIC (decl
) = (storage_class
== csc_static
);
6331 TREE_PUBLIC (decl
) = extern_ref
;
6335 DECL_TLS_MODEL (decl
) = decl_default_tls_model (decl
);
6338 if ((storage_class
== csc_extern
6339 || (storage_class
== csc_none
6340 && TREE_CODE (type
) == FUNCTION_TYPE
6342 && variably_modified_type_p (type
, NULL_TREE
))
6345 if (TREE_CODE (type
) == FUNCTION_TYPE
)
6346 error_at (loc
, "non-nested function with variably modified type");
6348 error_at (loc
, "object with variably modified type must have "
6352 /* Record `register' declaration for warnings on &
6353 and in case doing stupid register allocation. */
6355 if (storage_class
== csc_register
)
6357 C_DECL_REGISTER (decl
) = 1;
6358 DECL_REGISTER (decl
) = 1;
6361 /* Record constancy and volatility. */
6362 c_apply_type_quals_to_decl (type_quals
, decl
);
6364 /* Apply _Alignas specifiers. */
6367 DECL_ALIGN (decl
) = alignas_align
* BITS_PER_UNIT
;
6368 DECL_USER_ALIGN (decl
) = 1;
6371 /* If a type has volatile components, it should be stored in memory.
6372 Otherwise, the fact that those components are volatile
6373 will be ignored, and would even crash the compiler.
6374 Of course, this only makes sense on VAR,PARM, and RESULT decl's. */
6375 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl
))
6376 && (TREE_CODE (decl
) == VAR_DECL
|| TREE_CODE (decl
) == PARM_DECL
6377 || TREE_CODE (decl
) == RESULT_DECL
))
6379 /* It is not an error for a structure with volatile fields to
6380 be declared register, but reset DECL_REGISTER since it
6381 cannot actually go in a register. */
6382 int was_reg
= C_DECL_REGISTER (decl
);
6383 C_DECL_REGISTER (decl
) = 0;
6384 DECL_REGISTER (decl
) = 0;
6385 c_mark_addressable (decl
);
6386 C_DECL_REGISTER (decl
) = was_reg
;
6389 /* This is the earliest point at which we might know the assembler
6390 name of a variable. Thus, if it's known before this, die horribly. */
6391 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl
));
6394 && TREE_CODE (decl
) == VAR_DECL
6395 && TREE_PUBLIC (decl
)
6396 && TREE_STATIC (decl
)
6397 && (TREE_CODE (TREE_TYPE (decl
)) == RECORD_TYPE
6398 || TREE_CODE (TREE_TYPE (decl
)) == UNION_TYPE
6399 || TREE_CODE (TREE_TYPE (decl
)) == ENUMERAL_TYPE
)
6400 && TYPE_NAME (TREE_TYPE (decl
)) == NULL_TREE
)
6401 warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wc___compat
,
6402 ("non-local variable %qD with anonymous type is "
6403 "questionable in C++"),
6410 /* Decode the parameter-list info for a function type or function definition.
6411 The argument is the value returned by `get_parm_info' (or made in c-parse.c
6412 if there is an identifier list instead of a parameter decl list).
6413 These two functions are separate because when a function returns
6414 or receives functions then each is called multiple times but the order
6415 of calls is different. The last call to `grokparms' is always the one
6416 that contains the formal parameter names of a function definition.
6418 Return a list of arg types to use in the FUNCTION_TYPE for this function.
6420 FUNCDEF_FLAG is true for a function definition, false for
6421 a mere declaration. A nonempty identifier-list gets an error message
6422 when FUNCDEF_FLAG is false. */
6425 grokparms (struct c_arg_info
*arg_info
, bool funcdef_flag
)
6427 tree arg_types
= arg_info
->types
;
6429 if (funcdef_flag
&& arg_info
->had_vla_unspec
)
6431 /* A function definition isn't function prototype scope C99 6.2.1p4. */
6433 error ("%<[*]%> not allowed in other than function prototype scope");
6436 if (arg_types
== 0 && !funcdef_flag
6437 && !in_system_header_at (input_location
))
6438 warning (OPT_Wstrict_prototypes
,
6439 "function declaration isn%'t a prototype");
6441 if (arg_types
== error_mark_node
)
6442 return 0; /* don't set TYPE_ARG_TYPES in this case */
6444 else if (arg_types
&& TREE_CODE (TREE_VALUE (arg_types
)) == IDENTIFIER_NODE
)
6448 pedwarn (input_location
, 0, "parameter names (without types) in function declaration");
6449 arg_info
->parms
= NULL_TREE
;
6452 arg_info
->parms
= arg_info
->types
;
6454 arg_info
->types
= 0;
6459 tree parm
, type
, typelt
;
6460 unsigned int parmno
;
6463 /* If there is a parameter of incomplete type in a definition,
6464 this is an error. In a declaration this is valid, and a
6465 struct or union type may be completed later, before any calls
6466 or definition of the function. In the case where the tag was
6467 first declared within the parameter list, a warning has
6468 already been given. If a parameter has void type, then
6469 however the function cannot be defined or called, so
6472 for (parm
= arg_info
->parms
, typelt
= arg_types
, parmno
= 1;
6474 parm
= DECL_CHAIN (parm
), typelt
= TREE_CHAIN (typelt
), parmno
++)
6476 type
= TREE_VALUE (typelt
);
6477 if (type
== error_mark_node
)
6480 if (!COMPLETE_TYPE_P (type
))
6484 if (DECL_NAME (parm
))
6485 error_at (input_location
,
6486 "parameter %u (%q+D) has incomplete type",
6489 error_at (DECL_SOURCE_LOCATION (parm
),
6490 "parameter %u has incomplete type",
6493 TREE_VALUE (typelt
) = error_mark_node
;
6494 TREE_TYPE (parm
) = error_mark_node
;
6495 arg_types
= NULL_TREE
;
6497 else if (VOID_TYPE_P (type
))
6499 if (DECL_NAME (parm
))
6500 warning_at (input_location
, 0,
6501 "parameter %u (%q+D) has void type",
6504 warning_at (DECL_SOURCE_LOCATION (parm
), 0,
6505 "parameter %u has void type",
6510 errmsg
= targetm
.invalid_parameter_type (type
);
6514 TREE_VALUE (typelt
) = error_mark_node
;
6515 TREE_TYPE (parm
) = error_mark_node
;
6516 arg_types
= NULL_TREE
;
6519 if (DECL_NAME (parm
) && TREE_USED (parm
))
6520 warn_if_shadowing (parm
);
6526 /* Allocate and initialize a c_arg_info structure from the parser's
6530 build_arg_info (void)
6532 struct c_arg_info
*ret
= XOBNEW (&parser_obstack
, struct c_arg_info
);
6533 ret
->parms
= NULL_TREE
;
6535 ret
->types
= NULL_TREE
;
6536 ret
->others
= NULL_TREE
;
6537 ret
->pending_sizes
= NULL
;
6538 ret
->had_vla_unspec
= 0;
6542 /* Take apart the current scope and return a c_arg_info structure with
6543 info on a parameter list just parsed.
6545 This structure is later fed to 'grokparms' and 'store_parm_decls'.
6547 ELLIPSIS being true means the argument list ended in '...' so don't
6548 append a sentinel (void_list_node) to the end of the type-list.
6550 EXPR is NULL or an expression that needs to be evaluated for the
6551 side effects of array size expressions in the parameters. */
6554 get_parm_info (bool ellipsis
, tree expr
)
6556 struct c_binding
*b
= current_scope
->bindings
;
6557 struct c_arg_info
*arg_info
= build_arg_info ();
6560 vec
<c_arg_tag
, va_gc
> *tags
= NULL
;
6564 static bool explained_incomplete_types
= false;
6565 bool gave_void_only_once_err
= false;
6567 arg_info
->had_vla_unspec
= current_scope
->had_vla_unspec
;
6569 /* The bindings in this scope must not get put into a block.
6570 We will take care of deleting the binding nodes. */
6571 current_scope
->bindings
= 0;
6573 /* This function is only called if there was *something* on the
6577 /* A parameter list consisting solely of 'void' indicates that the
6578 function takes no arguments. But if the 'void' is qualified
6579 (by 'const' or 'volatile'), or has a storage class specifier
6580 ('register'), then the behavior is undefined; issue an error.
6581 Typedefs for 'void' are OK (see DR#157). */
6582 if (b
->prev
== 0 /* one binding */
6583 && TREE_CODE (b
->decl
) == PARM_DECL
/* which is a parameter */
6584 && !DECL_NAME (b
->decl
) /* anonymous */
6585 && VOID_TYPE_P (TREE_TYPE (b
->decl
))) /* of void type */
6587 if (TYPE_QUALS (TREE_TYPE (b
->decl
)) != TYPE_UNQUALIFIED
6588 || C_DECL_REGISTER (b
->decl
))
6589 error ("%<void%> as only parameter may not be qualified");
6591 /* There cannot be an ellipsis. */
6593 error ("%<void%> must be the only parameter");
6595 arg_info
->types
= void_list_node
;
6600 types
= void_list_node
;
6602 /* Break up the bindings list into parms, tags, types, and others;
6603 apply sanity checks; purge the name-to-decl bindings. */
6606 tree decl
= b
->decl
;
6607 tree type
= TREE_TYPE (decl
);
6609 const char *keyword
;
6611 switch (TREE_CODE (decl
))
6616 gcc_assert (I_SYMBOL_BINDING (b
->id
) == b
);
6617 I_SYMBOL_BINDING (b
->id
) = b
->shadowed
;
6620 /* Check for forward decls that never got their actual decl. */
6621 if (TREE_ASM_WRITTEN (decl
))
6622 error ("parameter %q+D has just a forward declaration", decl
);
6623 /* Check for (..., void, ...) and issue an error. */
6624 else if (VOID_TYPE_P (type
) && !DECL_NAME (decl
))
6626 if (!gave_void_only_once_err
)
6628 error ("%<void%> must be the only parameter");
6629 gave_void_only_once_err
= true;
6634 /* Valid parameter, add it to the list. */
6635 DECL_CHAIN (decl
) = parms
;
6638 /* Since there is a prototype, args are passed in their
6639 declared types. The back end may override this later. */
6640 DECL_ARG_TYPE (decl
) = type
;
6641 types
= tree_cons (0, type
, types
);
6645 case ENUMERAL_TYPE
: keyword
= "enum"; goto tag
;
6646 case UNION_TYPE
: keyword
= "union"; goto tag
;
6647 case RECORD_TYPE
: keyword
= "struct"; goto tag
;
6649 /* Types may not have tag-names, in which case the type
6650 appears in the bindings list with b->id NULL. */
6653 gcc_assert (I_TAG_BINDING (b
->id
) == b
);
6654 I_TAG_BINDING (b
->id
) = b
->shadowed
;
6657 /* Warn about any struct, union or enum tags defined in a
6658 parameter list. The scope of such types is limited to
6659 the parameter list, which is rarely if ever desirable
6660 (it's impossible to call such a function with type-
6661 correct arguments). An anonymous union parm type is
6662 meaningful as a GNU extension, so don't warn for that. */
6663 if (TREE_CODE (decl
) != UNION_TYPE
|| b
->id
!= 0)
6666 /* The %s will be one of 'struct', 'union', or 'enum'. */
6667 warning (0, "%<%s %E%> declared inside parameter list",
6670 /* The %s will be one of 'struct', 'union', or 'enum'. */
6671 warning (0, "anonymous %s declared inside parameter list",
6674 if (!explained_incomplete_types
)
6676 warning (0, "its scope is only this definition or declaration,"
6677 " which is probably not what you want");
6678 explained_incomplete_types
= true;
6684 vec_safe_push (tags
, tag
);
6690 /* CONST_DECLs appear here when we have an embedded enum,
6691 and TYPE_DECLs appear here when we have an embedded struct
6692 or union. No warnings for this - we already warned about the
6693 type itself. FUNCTION_DECLs appear when there is an implicit
6694 function declaration in the parameter list. */
6696 /* When we reinsert this decl in the function body, we need
6697 to reconstruct whether it was marked as nested. */
6698 gcc_assert (TREE_CODE (decl
) == FUNCTION_DECL
6701 DECL_CHAIN (decl
) = others
;
6706 /* error_mark_node appears here when we have an undeclared
6707 variable. Just throw it away. */
6710 gcc_assert (I_SYMBOL_BINDING (b
->id
) == b
);
6711 I_SYMBOL_BINDING (b
->id
) = b
->shadowed
;
6715 /* Other things that might be encountered. */
6722 b
= free_binding_and_advance (b
);
6725 arg_info
->parms
= parms
;
6726 arg_info
->tags
= tags
;
6727 arg_info
->types
= types
;
6728 arg_info
->others
= others
;
6729 arg_info
->pending_sizes
= expr
;
6733 /* Get the struct, enum or union (CODE says which) with tag NAME.
6734 Define the tag as a forward-reference with location LOC if it is
6735 not defined. Return a c_typespec structure for the type
6739 parser_xref_tag (location_t loc
, enum tree_code code
, tree name
)
6741 struct c_typespec ret
;
6745 ret
.expr
= NULL_TREE
;
6746 ret
.expr_const_operands
= true;
6748 /* If a cross reference is requested, look up the type
6749 already defined for this tag and return it. */
6751 ref
= lookup_tag (code
, name
, 0, &refloc
);
6752 /* If this is the right type of tag, return what we found.
6753 (This reference will be shadowed by shadow_tag later if appropriate.)
6754 If this is the wrong type of tag, do not return it. If it was the
6755 wrong type in the same scope, we will have had an error
6756 message already; if in a different scope and declaring
6757 a name, pending_xref_error will give an error message; but if in a
6758 different scope and not declaring a name, this tag should
6759 shadow the previous declaration of a different type of tag, and
6760 this would not work properly if we return the reference found.
6761 (For example, with "struct foo" in an outer scope, "union foo;"
6762 must shadow that tag with a new one of union type.) */
6763 ret
.kind
= (ref
? ctsk_tagref
: ctsk_tagfirstref
);
6764 if (ref
&& TREE_CODE (ref
) == code
)
6766 if (C_TYPE_DEFINED_IN_STRUCT (ref
)
6767 && loc
!= UNKNOWN_LOCATION
6773 warning_at (loc
, OPT_Wc___compat
,
6774 ("enum type defined in struct or union "
6775 "is not visible in C++"));
6776 inform (refloc
, "enum type defined here");
6779 warning_at (loc
, OPT_Wc___compat
,
6780 ("struct defined in struct or union "
6781 "is not visible in C++"));
6782 inform (refloc
, "struct defined here");
6785 warning_at (loc
, OPT_Wc___compat
,
6786 ("union defined in struct or union "
6787 "is not visible in C++"));
6788 inform (refloc
, "union defined here");
6799 /* If no such tag is yet defined, create a forward-reference node
6800 and record it as the "definition".
6801 When a real declaration of this type is found,
6802 the forward-reference will be altered into a real type. */
6804 ref
= make_node (code
);
6805 if (code
== ENUMERAL_TYPE
)
6807 /* Give the type a default layout like unsigned int
6808 to avoid crashing if it does not get defined. */
6809 SET_TYPE_MODE (ref
, TYPE_MODE (unsigned_type_node
));
6810 TYPE_ALIGN (ref
) = TYPE_ALIGN (unsigned_type_node
);
6811 TYPE_USER_ALIGN (ref
) = 0;
6812 TYPE_UNSIGNED (ref
) = 1;
6813 TYPE_PRECISION (ref
) = TYPE_PRECISION (unsigned_type_node
);
6814 TYPE_MIN_VALUE (ref
) = TYPE_MIN_VALUE (unsigned_type_node
);
6815 TYPE_MAX_VALUE (ref
) = TYPE_MAX_VALUE (unsigned_type_node
);
6818 pushtag (loc
, name
, ref
);
6824 /* Get the struct, enum or union (CODE says which) with tag NAME.
6825 Define the tag as a forward-reference if it is not defined.
6826 Return a tree for the type. */
6829 xref_tag (enum tree_code code
, tree name
)
6831 return parser_xref_tag (input_location
, code
, name
).spec
;
6834 /* Make sure that the tag NAME is defined *in the current scope*
6835 at least as a forward reference.
6836 LOC is the location of the struct's definition.
6837 CODE says which kind of tag NAME ought to be.
6839 This stores the current value of the file static STRUCT_PARSE_INFO
6840 in *ENCLOSING_STRUCT_PARSE_INFO, and points STRUCT_PARSE_INFO at a
6841 new c_struct_parse_info structure. The old value of
6842 STRUCT_PARSE_INFO is restored in finish_struct. */
6845 start_struct (location_t loc
, enum tree_code code
, tree name
,
6846 struct c_struct_parse_info
**enclosing_struct_parse_info
)
6848 /* If there is already a tag defined at this scope
6849 (as a forward reference), just return it. */
6851 tree ref
= NULL_TREE
;
6852 location_t refloc
= UNKNOWN_LOCATION
;
6854 if (name
!= NULL_TREE
)
6855 ref
= lookup_tag (code
, name
, 1, &refloc
);
6856 if (ref
&& TREE_CODE (ref
) == code
)
6858 if (TYPE_SIZE (ref
))
6860 if (code
== UNION_TYPE
)
6861 error_at (loc
, "redefinition of %<union %E%>", name
);
6863 error_at (loc
, "redefinition of %<struct %E%>", name
);
6864 if (refloc
!= UNKNOWN_LOCATION
)
6865 inform (refloc
, "originally defined here");
6866 /* Don't create structures using a name already in use. */
6869 else if (C_TYPE_BEING_DEFINED (ref
))
6871 if (code
== UNION_TYPE
)
6872 error_at (loc
, "nested redefinition of %<union %E%>", name
);
6874 error_at (loc
, "nested redefinition of %<struct %E%>", name
);
6875 /* Don't bother to report "originally defined here" for a
6876 nested redefinition; the original definition should be
6878 /* Don't create structures that contain themselves. */
6883 /* Otherwise create a forward-reference just so the tag is in scope. */
6885 if (ref
== NULL_TREE
|| TREE_CODE (ref
) != code
)
6887 ref
= make_node (code
);
6888 pushtag (loc
, name
, ref
);
6891 C_TYPE_BEING_DEFINED (ref
) = 1;
6892 TYPE_PACKED (ref
) = flag_pack_struct
;
6894 *enclosing_struct_parse_info
= struct_parse_info
;
6895 struct_parse_info
= XNEW (struct c_struct_parse_info
);
6896 struct_parse_info
->struct_types
.create (0);
6897 struct_parse_info
->fields
.create (0);
6898 struct_parse_info
->typedefs_seen
.create (0);
6900 /* FIXME: This will issue a warning for a use of a type defined
6901 within a statement expr used within sizeof, et. al. This is not
6902 terribly serious as C++ doesn't permit statement exprs within
6904 if (warn_cxx_compat
&& (in_sizeof
|| in_typeof
|| in_alignof
))
6905 warning_at (loc
, OPT_Wc___compat
,
6906 "defining type in %qs expression is invalid in C++",
6909 : (in_typeof
? "typeof" : "alignof")));
6914 /* Process the specs, declarator and width (NULL if omitted)
6915 of a structure component, returning a FIELD_DECL node.
6916 WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node.
6917 DECL_ATTRS is as for grokdeclarator.
6919 LOC is the location of the structure component.
6921 This is done during the parsing of the struct declaration.
6922 The FIELD_DECL nodes are chained together and the lot of them
6923 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
6926 grokfield (location_t loc
,
6927 struct c_declarator
*declarator
, struct c_declspecs
*declspecs
,
6928 tree width
, tree
*decl_attrs
)
6932 if (declarator
->kind
== cdk_id
&& declarator
->u
.id
== NULL_TREE
6933 && width
== NULL_TREE
)
6935 /* This is an unnamed decl.
6937 If we have something of the form "union { list } ;" then this
6938 is the anonymous union extension. Similarly for struct.
6940 If this is something of the form "struct foo;", then
6941 If MS or Plan 9 extensions are enabled, this is handled as
6942 an anonymous struct.
6943 Otherwise this is a forward declaration of a structure tag.
6945 If this is something of the form "foo;" and foo is a TYPE_DECL, then
6946 If foo names a structure or union without a tag, then this
6947 is an anonymous struct (this is permitted by C11).
6948 If MS or Plan 9 extensions are enabled and foo names a
6949 structure, then again this is an anonymous struct.
6950 Otherwise this is an error.
6952 Oh what a horrid tangled web we weave. I wonder if MS consciously
6953 took this from Plan 9 or if it was an accident of implementation
6954 that took root before someone noticed the bug... */
6956 tree type
= declspecs
->type
;
6957 bool type_ok
= (TREE_CODE (type
) == RECORD_TYPE
6958 || TREE_CODE (type
) == UNION_TYPE
);
6962 && (flag_ms_extensions
6963 || flag_plan9_extensions
6964 || !declspecs
->typedef_p
))
6966 if (flag_ms_extensions
|| flag_plan9_extensions
)
6968 else if (TYPE_NAME (type
) == NULL
)
6975 pedwarn (loc
, 0, "declaration does not declare anything");
6981 pedwarn (loc
, OPT_Wpedantic
,
6982 "ISO C99 doesn%'t support unnamed structs/unions");
6984 pedwarn (loc
, OPT_Wpedantic
,
6985 "ISO C90 doesn%'t support unnamed structs/unions");
6989 value
= grokdeclarator (declarator
, declspecs
, FIELD
, false,
6990 width
? &width
: NULL
, decl_attrs
, NULL
, NULL
,
6993 finish_decl (value
, loc
, NULL_TREE
, NULL_TREE
, NULL_TREE
);
6994 DECL_INITIAL (value
) = width
;
6996 if (warn_cxx_compat
&& DECL_NAME (value
) != NULL_TREE
)
6998 /* If we currently have a binding for this field, set the
6999 in_struct field in the binding, so that we warn about lookups
7001 struct c_binding
*b
= I_SYMBOL_BINDING (DECL_NAME (value
));
7004 /* If the in_struct field is not yet set, push it on a list
7005 to be cleared when this struct is finished. */
7008 struct_parse_info
->fields
.safe_push (b
);
7017 /* Subroutine of detect_field_duplicates: return whether X and Y,
7018 which are both fields in the same struct, have duplicate field
7022 is_duplicate_field (tree x
, tree y
)
7024 if (DECL_NAME (x
) != NULL_TREE
&& DECL_NAME (x
) == DECL_NAME (y
))
7027 /* When using -fplan9-extensions, an anonymous field whose name is a
7028 typedef can duplicate a field name. */
7029 if (flag_plan9_extensions
7030 && (DECL_NAME (x
) == NULL_TREE
|| DECL_NAME (y
) == NULL_TREE
))
7032 tree xt
, xn
, yt
, yn
;
7035 if (DECL_NAME (x
) != NULL_TREE
)
7037 else if ((TREE_CODE (xt
) == RECORD_TYPE
|| TREE_CODE (xt
) == UNION_TYPE
)
7038 && TYPE_NAME (xt
) != NULL_TREE
7039 && TREE_CODE (TYPE_NAME (xt
)) == TYPE_DECL
)
7040 xn
= DECL_NAME (TYPE_NAME (xt
));
7045 if (DECL_NAME (y
) != NULL_TREE
)
7047 else if ((TREE_CODE (yt
) == RECORD_TYPE
|| TREE_CODE (yt
) == UNION_TYPE
)
7048 && TYPE_NAME (yt
) != NULL_TREE
7049 && TREE_CODE (TYPE_NAME (yt
)) == TYPE_DECL
)
7050 yn
= DECL_NAME (TYPE_NAME (yt
));
7054 if (xn
!= NULL_TREE
&& xn
== yn
)
7061 /* Subroutine of detect_field_duplicates: add the fields of FIELDLIST
7062 to HTAB, giving errors for any duplicates. */
7065 detect_field_duplicates_hash (tree fieldlist
,
7066 hash_table
<pointer_hash
<tree_node
> > htab
)
7071 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
7072 if ((y
= DECL_NAME (x
)) != 0)
7074 slot
= htab
.find_slot (y
, INSERT
);
7077 error ("duplicate member %q+D", x
);
7078 DECL_NAME (x
) = NULL_TREE
;
7082 else if (TREE_CODE (TREE_TYPE (x
)) == RECORD_TYPE
7083 || TREE_CODE (TREE_TYPE (x
)) == UNION_TYPE
)
7085 detect_field_duplicates_hash (TYPE_FIELDS (TREE_TYPE (x
)), htab
);
7087 /* When using -fplan9-extensions, an anonymous field whose
7088 name is a typedef can duplicate a field name. */
7089 if (flag_plan9_extensions
7090 && TYPE_NAME (TREE_TYPE (x
)) != NULL_TREE
7091 && TREE_CODE (TYPE_NAME (TREE_TYPE (x
))) == TYPE_DECL
)
7093 tree xn
= DECL_NAME (TYPE_NAME (TREE_TYPE (x
)));
7094 slot
= htab
.find_slot (xn
, INSERT
);
7096 error ("duplicate member %q+D", TYPE_NAME (TREE_TYPE (x
)));
7102 /* Generate an error for any duplicate field names in FIELDLIST. Munge
7103 the list such that this does not present a problem later. */
7106 detect_field_duplicates (tree fieldlist
)
7111 /* If the struct is the list of instance variables of an Objective-C
7112 class, then we need to check all the instance variables of
7113 superclasses when checking for duplicates (since you can't have
7114 an instance variable in a subclass with the same name as an
7115 instance variable in a superclass). We pass on this job to the
7116 Objective-C compiler. objc_detect_field_duplicates() will return
7117 false if we are not checking the list of instance variables and
7118 the C frontend should proceed with the standard field duplicate
7119 checks. If we are checking the list of instance variables, the
7120 ObjC frontend will do the check, emit the errors if needed, and
7121 then return true. */
7122 if (c_dialect_objc ())
7123 if (objc_detect_field_duplicates (false))
7126 /* First, see if there are more than "a few" fields.
7127 This is trivially true if there are zero or one fields. */
7128 if (!fieldlist
|| !DECL_CHAIN (fieldlist
))
7133 if (DECL_NAME (x
) == NULL_TREE
7134 && (TREE_CODE (TREE_TYPE (x
)) == RECORD_TYPE
7135 || TREE_CODE (TREE_TYPE (x
)) == UNION_TYPE
))
7138 } while (timeout
> 0 && x
);
7140 /* If there were "few" fields and no anonymous structures or unions,
7141 avoid the overhead of allocating a hash table. Instead just do
7142 the nested traversal thing. */
7145 for (x
= DECL_CHAIN (fieldlist
); x
; x
= DECL_CHAIN (x
))
7146 /* When using -fplan9-extensions, we can have duplicates
7147 between typedef names and fields. */
7149 || (flag_plan9_extensions
7150 && DECL_NAME (x
) == NULL_TREE
7151 && (TREE_CODE (TREE_TYPE (x
)) == RECORD_TYPE
7152 || TREE_CODE (TREE_TYPE (x
)) == UNION_TYPE
)
7153 && TYPE_NAME (TREE_TYPE (x
)) != NULL_TREE
7154 && TREE_CODE (TYPE_NAME (TREE_TYPE (x
))) == TYPE_DECL
))
7156 for (y
= fieldlist
; y
!= x
; y
= TREE_CHAIN (y
))
7157 if (is_duplicate_field (y
, x
))
7159 error ("duplicate member %q+D", x
);
7160 DECL_NAME (x
) = NULL_TREE
;
7166 hash_table
<pointer_hash
<tree_node
> > htab
;
7169 detect_field_duplicates_hash (fieldlist
, htab
);
7174 /* Finish up struct info used by -Wc++-compat. */
7177 warn_cxx_compat_finish_struct (tree fieldlist
)
7181 struct c_binding
*b
;
7183 /* Set the C_TYPE_DEFINED_IN_STRUCT flag for each type defined in
7184 the current struct. We do this now at the end of the struct
7185 because the flag is used to issue visibility warnings, and we
7186 only want to issue those warnings if the type is referenced
7187 outside of the struct declaration. */
7188 FOR_EACH_VEC_ELT (struct_parse_info
->struct_types
, ix
, x
)
7189 C_TYPE_DEFINED_IN_STRUCT (x
) = 1;
7191 /* The TYPEDEFS_SEEN field of STRUCT_PARSE_INFO is a list of
7192 typedefs used when declaring fields in this struct. If the name
7193 of any of the fields is also a typedef name then the struct would
7194 not parse in C++, because the C++ lookup rules say that the
7195 typedef name would be looked up in the context of the struct, and
7196 would thus be the field rather than the typedef. */
7197 if (!struct_parse_info
->typedefs_seen
.is_empty ()
7198 && fieldlist
!= NULL_TREE
)
7200 /* Use a pointer_set using the name of the typedef. We can use
7201 a pointer_set because identifiers are interned. */
7202 struct pointer_set_t
*tset
= pointer_set_create ();
7204 FOR_EACH_VEC_ELT (struct_parse_info
->typedefs_seen
, ix
, x
)
7205 pointer_set_insert (tset
, DECL_NAME (x
));
7207 for (x
= fieldlist
; x
!= NULL_TREE
; x
= DECL_CHAIN (x
))
7209 if (DECL_NAME (x
) != NULL_TREE
7210 && pointer_set_contains (tset
, DECL_NAME (x
)))
7212 warning_at (DECL_SOURCE_LOCATION (x
), OPT_Wc___compat
,
7213 ("using %qD as both field and typedef name is "
7216 /* FIXME: It would be nice to report the location where
7217 the typedef name is used. */
7221 pointer_set_destroy (tset
);
7224 /* For each field which has a binding and which was not defined in
7225 an enclosing struct, clear the in_struct field. */
7226 FOR_EACH_VEC_ELT (struct_parse_info
->fields
, ix
, b
)
7230 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
7231 LOC is the location of the RECORD_TYPE or UNION_TYPE's definition.
7232 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
7233 ATTRIBUTES are attributes to be applied to the structure.
7235 ENCLOSING_STRUCT_PARSE_INFO is the value of STRUCT_PARSE_INFO when
7236 the struct was started. */
7239 finish_struct (location_t loc
, tree t
, tree fieldlist
, tree attributes
,
7240 struct c_struct_parse_info
*enclosing_struct_parse_info
)
7243 bool toplevel
= file_scope
== current_scope
;
7244 int saw_named_field
;
7246 /* If this type was previously laid out as a forward reference,
7247 make sure we lay it out again. */
7251 decl_attributes (&t
, attributes
, (int) ATTR_FLAG_TYPE_IN_PLACE
);
7255 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
7257 if (DECL_NAME (x
) != 0)
7260 && (TREE_CODE (TREE_TYPE (x
)) == RECORD_TYPE
7261 || TREE_CODE (TREE_TYPE (x
)) == UNION_TYPE
))
7267 if (TREE_CODE (t
) == UNION_TYPE
)
7270 pedwarn (loc
, OPT_Wpedantic
, "union has no named members");
7272 pedwarn (loc
, OPT_Wpedantic
, "union has no members");
7277 pedwarn (loc
, OPT_Wpedantic
, "struct has no named members");
7279 pedwarn (loc
, OPT_Wpedantic
, "struct has no members");
7284 /* Install struct as DECL_CONTEXT of each field decl.
7285 Also process specified field sizes, found in the DECL_INITIAL,
7286 storing 0 there after the type has been changed to precision equal
7287 to its width, rather than the precision of the specified standard
7288 type. (Correct layout requires the original type to have been preserved
7291 saw_named_field
= 0;
7292 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
7294 if (TREE_TYPE (x
) == error_mark_node
)
7297 DECL_CONTEXT (x
) = t
;
7299 /* If any field is const, the structure type is pseudo-const. */
7300 if (TREE_READONLY (x
))
7301 C_TYPE_FIELDS_READONLY (t
) = 1;
7304 /* A field that is pseudo-const makes the structure likewise. */
7305 tree t1
= strip_array_types (TREE_TYPE (x
));
7306 if ((TREE_CODE (t1
) == RECORD_TYPE
|| TREE_CODE (t1
) == UNION_TYPE
)
7307 && C_TYPE_FIELDS_READONLY (t1
))
7308 C_TYPE_FIELDS_READONLY (t
) = 1;
7311 /* Any field that is volatile means variables of this type must be
7312 treated in some ways as volatile. */
7313 if (TREE_THIS_VOLATILE (x
))
7314 C_TYPE_FIELDS_VOLATILE (t
) = 1;
7316 /* Any field of nominal variable size implies structure is too. */
7317 if (C_DECL_VARIABLE_SIZE (x
))
7318 C_TYPE_VARIABLE_SIZE (t
) = 1;
7320 if (DECL_INITIAL (x
))
7322 unsigned HOST_WIDE_INT width
= tree_to_uhwi (DECL_INITIAL (x
));
7323 DECL_SIZE (x
) = bitsize_int (width
);
7324 DECL_BIT_FIELD (x
) = 1;
7325 SET_DECL_C_BIT_FIELD (x
);
7329 && (DECL_BIT_FIELD (x
)
7330 || TYPE_ALIGN (TREE_TYPE (x
)) > BITS_PER_UNIT
))
7331 DECL_PACKED (x
) = 1;
7333 /* Detect flexible array member in an invalid context. */
7334 if (TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
7335 && TYPE_SIZE (TREE_TYPE (x
)) == NULL_TREE
7336 && TYPE_DOMAIN (TREE_TYPE (x
)) != NULL_TREE
7337 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x
))) == NULL_TREE
)
7339 if (TREE_CODE (t
) == UNION_TYPE
)
7341 error_at (DECL_SOURCE_LOCATION (x
),
7342 "flexible array member in union");
7343 TREE_TYPE (x
) = error_mark_node
;
7345 else if (DECL_CHAIN (x
) != NULL_TREE
)
7347 error_at (DECL_SOURCE_LOCATION (x
),
7348 "flexible array member not at end of struct");
7349 TREE_TYPE (x
) = error_mark_node
;
7351 else if (!saw_named_field
)
7353 error_at (DECL_SOURCE_LOCATION (x
),
7354 "flexible array member in otherwise empty struct");
7355 TREE_TYPE (x
) = error_mark_node
;
7359 if (pedantic
&& TREE_CODE (t
) == RECORD_TYPE
7360 && flexible_array_type_p (TREE_TYPE (x
)))
7361 pedwarn (DECL_SOURCE_LOCATION (x
), OPT_Wpedantic
,
7362 "invalid use of structure with flexible array member");
7365 || TREE_CODE (TREE_TYPE (x
)) == RECORD_TYPE
7366 || TREE_CODE (TREE_TYPE (x
)) == UNION_TYPE
)
7367 saw_named_field
= 1;
7370 detect_field_duplicates (fieldlist
);
7372 /* Now we have the nearly final fieldlist. Record it,
7373 then lay out the structure or union (including the fields). */
7375 TYPE_FIELDS (t
) = fieldlist
;
7379 if (TYPE_SIZE_UNIT (t
)
7380 && TREE_CODE (TYPE_SIZE_UNIT (t
)) == INTEGER_CST
7381 && !TREE_OVERFLOW (TYPE_SIZE_UNIT (t
))
7382 && !valid_constant_size_p (TYPE_SIZE_UNIT (t
)))
7383 error ("type %qT is too large", t
);
7385 /* Give bit-fields their proper types. */
7387 tree
*fieldlistp
= &fieldlist
;
7389 if (TREE_CODE (*fieldlistp
) == FIELD_DECL
&& DECL_INITIAL (*fieldlistp
)
7390 && TREE_TYPE (*fieldlistp
) != error_mark_node
)
7392 unsigned HOST_WIDE_INT width
7393 = tree_to_uhwi (DECL_INITIAL (*fieldlistp
));
7394 tree type
= TREE_TYPE (*fieldlistp
);
7395 if (width
!= TYPE_PRECISION (type
))
7397 TREE_TYPE (*fieldlistp
)
7398 = c_build_bitfield_integer_type (width
, TYPE_UNSIGNED (type
));
7399 DECL_MODE (*fieldlistp
) = TYPE_MODE (TREE_TYPE (*fieldlistp
));
7401 DECL_INITIAL (*fieldlistp
) = 0;
7404 fieldlistp
= &DECL_CHAIN (*fieldlistp
);
7407 /* Now we have the truly final field list.
7408 Store it in this type and in the variants. */
7410 TYPE_FIELDS (t
) = fieldlist
;
7412 /* If there are lots of fields, sort so we can look through them fast.
7413 We arbitrarily consider 16 or more elts to be "a lot". */
7418 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
7420 if (len
> 15 || DECL_NAME (x
) == NULL
)
7428 struct lang_type
*space
;
7429 struct sorted_fields_type
*space2
;
7431 len
+= list_length (x
);
7433 /* Use the same allocation policy here that make_node uses, to
7434 ensure that this lives as long as the rest of the struct decl.
7435 All decls in an inline function need to be saved. */
7437 space
= ggc_cleared_alloc
<struct lang_type
> ();
7438 space2
= (sorted_fields_type
*) ggc_internal_alloc
7439 (sizeof (struct sorted_fields_type
) + len
* sizeof (tree
));
7443 field_array
= &space2
->elts
[0];
7444 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
7446 field_array
[len
++] = x
;
7448 /* If there is anonymous struct or union, break out of the loop. */
7449 if (DECL_NAME (x
) == NULL
)
7452 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
7455 TYPE_LANG_SPECIFIC (t
) = space
;
7456 TYPE_LANG_SPECIFIC (t
)->s
->len
= len
;
7457 field_array
= TYPE_LANG_SPECIFIC (t
)->s
->elts
;
7458 qsort (field_array
, len
, sizeof (tree
), field_decl_cmp
);
7463 for (x
= TYPE_MAIN_VARIANT (t
); x
; x
= TYPE_NEXT_VARIANT (x
))
7465 TYPE_FIELDS (x
) = TYPE_FIELDS (t
);
7466 TYPE_LANG_SPECIFIC (x
) = TYPE_LANG_SPECIFIC (t
);
7467 C_TYPE_FIELDS_READONLY (x
) = C_TYPE_FIELDS_READONLY (t
);
7468 C_TYPE_FIELDS_VOLATILE (x
) = C_TYPE_FIELDS_VOLATILE (t
);
7469 C_TYPE_VARIABLE_SIZE (x
) = C_TYPE_VARIABLE_SIZE (t
);
7472 /* If this was supposed to be a transparent union, but we can't
7473 make it one, warn and turn off the flag. */
7474 if (TREE_CODE (t
) == UNION_TYPE
7475 && TYPE_TRANSPARENT_AGGR (t
)
7476 && (!TYPE_FIELDS (t
) || TYPE_MODE (t
) != DECL_MODE (TYPE_FIELDS (t
))))
7478 TYPE_TRANSPARENT_AGGR (t
) = 0;
7479 warning_at (loc
, 0, "union cannot be made transparent");
7482 /* If this structure or union completes the type of any previous
7483 variable declaration, lay it out and output its rtl. */
7484 for (x
= C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t
));
7488 tree decl
= TREE_VALUE (x
);
7489 if (TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
)
7490 layout_array_type (TREE_TYPE (decl
));
7491 if (TREE_CODE (decl
) != TYPE_DECL
)
7493 layout_decl (decl
, 0);
7494 if (c_dialect_objc ())
7495 objc_check_decl (decl
);
7496 rest_of_decl_compilation (decl
, toplevel
, 0);
7499 C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t
)) = 0;
7501 /* Update type location to the one of the definition, instead of e.g.
7502 a forward declaration. */
7503 if (TYPE_STUB_DECL (t
))
7504 DECL_SOURCE_LOCATION (TYPE_STUB_DECL (t
)) = loc
;
7506 /* Finish debugging output for this type. */
7507 rest_of_type_compilation (t
, toplevel
);
7509 /* If we're inside a function proper, i.e. not file-scope and not still
7510 parsing parameters, then arrange for the size of a variable sized type
7512 if (building_stmt_list_p () && variably_modified_type_p (t
, NULL_TREE
))
7513 add_stmt (build_stmt (loc
,
7514 DECL_EXPR
, build_decl (loc
, TYPE_DECL
, NULL
, t
)));
7516 if (warn_cxx_compat
)
7517 warn_cxx_compat_finish_struct (fieldlist
);
7519 struct_parse_info
->struct_types
.release ();
7520 struct_parse_info
->fields
.release ();
7521 struct_parse_info
->typedefs_seen
.release ();
7522 XDELETE (struct_parse_info
);
7524 struct_parse_info
= enclosing_struct_parse_info
;
7526 /* If this struct is defined inside a struct, add it to
7529 && struct_parse_info
!= NULL
7530 && !in_sizeof
&& !in_typeof
&& !in_alignof
)
7531 struct_parse_info
->struct_types
.safe_push (t
);
7536 /* Lay out the type T, and its element type, and so on. */
7539 layout_array_type (tree t
)
7541 if (TREE_CODE (TREE_TYPE (t
)) == ARRAY_TYPE
)
7542 layout_array_type (TREE_TYPE (t
));
7546 /* Begin compiling the definition of an enumeration type.
7547 NAME is its name (or null if anonymous).
7548 LOC is the enum's location.
7549 Returns the type object, as yet incomplete.
7550 Also records info about it so that build_enumerator
7551 may be used to declare the individual values as they are read. */
7554 start_enum (location_t loc
, struct c_enum_contents
*the_enum
, tree name
)
7556 tree enumtype
= NULL_TREE
;
7557 location_t enumloc
= UNKNOWN_LOCATION
;
7559 /* If this is the real definition for a previous forward reference,
7560 fill in the contents in the same object that used to be the
7561 forward reference. */
7563 if (name
!= NULL_TREE
)
7564 enumtype
= lookup_tag (ENUMERAL_TYPE
, name
, 1, &enumloc
);
7566 if (enumtype
== 0 || TREE_CODE (enumtype
) != ENUMERAL_TYPE
)
7568 enumtype
= make_node (ENUMERAL_TYPE
);
7569 pushtag (loc
, name
, enumtype
);
7572 if (C_TYPE_BEING_DEFINED (enumtype
))
7573 error_at (loc
, "nested redefinition of %<enum %E%>", name
);
7575 C_TYPE_BEING_DEFINED (enumtype
) = 1;
7577 if (TYPE_VALUES (enumtype
) != 0)
7579 /* This enum is a named one that has been declared already. */
7580 error_at (loc
, "redeclaration of %<enum %E%>", name
);
7581 if (enumloc
!= UNKNOWN_LOCATION
)
7582 inform (enumloc
, "originally defined here");
7584 /* Completely replace its old definition.
7585 The old enumerators remain defined, however. */
7586 TYPE_VALUES (enumtype
) = 0;
7589 the_enum
->enum_next_value
= integer_zero_node
;
7590 the_enum
->enum_overflow
= 0;
7592 if (flag_short_enums
)
7593 TYPE_PACKED (enumtype
) = 1;
7595 /* FIXME: This will issue a warning for a use of a type defined
7596 within sizeof in a statement expr. This is not terribly serious
7597 as C++ doesn't permit statement exprs within sizeof anyhow. */
7598 if (warn_cxx_compat
&& (in_sizeof
|| in_typeof
|| in_alignof
))
7599 warning_at (loc
, OPT_Wc___compat
,
7600 "defining type in %qs expression is invalid in C++",
7603 : (in_typeof
? "typeof" : "alignof")));
7608 /* After processing and defining all the values of an enumeration type,
7609 install their decls in the enumeration type and finish it off.
7610 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
7611 and ATTRIBUTES are the specified attributes.
7612 Returns ENUMTYPE. */
7615 finish_enum (tree enumtype
, tree values
, tree attributes
)
7618 tree minnode
= 0, maxnode
= 0;
7621 bool toplevel
= (file_scope
== current_scope
);
7622 struct lang_type
*lt
;
7624 decl_attributes (&enumtype
, attributes
, (int) ATTR_FLAG_TYPE_IN_PLACE
);
7626 /* Calculate the maximum value of any enumerator in this type. */
7628 if (values
== error_mark_node
)
7629 minnode
= maxnode
= integer_zero_node
;
7632 minnode
= maxnode
= TREE_VALUE (values
);
7633 for (pair
= TREE_CHAIN (values
); pair
; pair
= TREE_CHAIN (pair
))
7635 tree value
= TREE_VALUE (pair
);
7636 if (tree_int_cst_lt (maxnode
, value
))
7638 if (tree_int_cst_lt (value
, minnode
))
7643 /* Construct the final type of this enumeration. It is the same
7644 as one of the integral types - the narrowest one that fits, except
7645 that normally we only go as narrow as int - and signed iff any of
7646 the values are negative. */
7647 sign
= (tree_int_cst_sgn (minnode
) >= 0) ? UNSIGNED
: SIGNED
;
7648 precision
= MAX (tree_int_cst_min_precision (minnode
, sign
),
7649 tree_int_cst_min_precision (maxnode
, sign
));
7651 if (TYPE_PACKED (enumtype
) || precision
> TYPE_PRECISION (integer_type_node
))
7653 tem
= c_common_type_for_size (precision
, sign
== UNSIGNED
? 1 : 0);
7656 warning (0, "enumeration values exceed range of largest integer");
7657 tem
= long_long_integer_type_node
;
7661 tem
= sign
== UNSIGNED
? unsigned_type_node
: integer_type_node
;
7663 TYPE_MIN_VALUE (enumtype
) = TYPE_MIN_VALUE (tem
);
7664 TYPE_MAX_VALUE (enumtype
) = TYPE_MAX_VALUE (tem
);
7665 TYPE_UNSIGNED (enumtype
) = TYPE_UNSIGNED (tem
);
7666 TYPE_SIZE (enumtype
) = 0;
7668 /* If the precision of the type was specific with an attribute and it
7669 was too small, give an error. Otherwise, use it. */
7670 if (TYPE_PRECISION (enumtype
))
7672 if (precision
> TYPE_PRECISION (enumtype
))
7673 error ("specified mode too small for enumeral values");
7676 TYPE_PRECISION (enumtype
) = TYPE_PRECISION (tem
);
7678 layout_type (enumtype
);
7680 if (values
!= error_mark_node
)
7682 /* Change the type of the enumerators to be the enum type. We
7683 need to do this irrespective of the size of the enum, for
7684 proper type checking. Replace the DECL_INITIALs of the
7685 enumerators, and the value slots of the list, with copies
7686 that have the enum type; they cannot be modified in place
7687 because they may be shared (e.g. integer_zero_node) Finally,
7688 change the purpose slots to point to the names of the decls. */
7689 for (pair
= values
; pair
; pair
= TREE_CHAIN (pair
))
7691 tree enu
= TREE_PURPOSE (pair
);
7692 tree ini
= DECL_INITIAL (enu
);
7694 TREE_TYPE (enu
) = enumtype
;
7696 /* The ISO C Standard mandates enumerators to have type int,
7697 even though the underlying type of an enum type is
7698 unspecified. However, GCC allows enumerators of any
7699 integer type as an extensions. build_enumerator()
7700 converts any enumerators that fit in an int to type int,
7701 to avoid promotions to unsigned types when comparing
7702 integers with enumerators that fit in the int range.
7703 When -pedantic is given, build_enumerator() would have
7704 already warned about those that don't fit. Here we
7705 convert the rest to the enumerator type. */
7706 if (TREE_TYPE (ini
) != integer_type_node
)
7707 ini
= convert (enumtype
, ini
);
7709 DECL_INITIAL (enu
) = ini
;
7710 TREE_PURPOSE (pair
) = DECL_NAME (enu
);
7711 TREE_VALUE (pair
) = ini
;
7714 TYPE_VALUES (enumtype
) = values
;
7717 /* Record the min/max values so that we can warn about bit-field
7718 enumerations that are too small for the values. */
7719 lt
= ggc_cleared_alloc
<struct lang_type
> ();
7720 lt
->enum_min
= minnode
;
7721 lt
->enum_max
= maxnode
;
7722 TYPE_LANG_SPECIFIC (enumtype
) = lt
;
7724 /* Fix up all variant types of this enum type. */
7725 for (tem
= TYPE_MAIN_VARIANT (enumtype
); tem
; tem
= TYPE_NEXT_VARIANT (tem
))
7727 if (tem
== enumtype
)
7729 TYPE_VALUES (tem
) = TYPE_VALUES (enumtype
);
7730 TYPE_MIN_VALUE (tem
) = TYPE_MIN_VALUE (enumtype
);
7731 TYPE_MAX_VALUE (tem
) = TYPE_MAX_VALUE (enumtype
);
7732 TYPE_SIZE (tem
) = TYPE_SIZE (enumtype
);
7733 TYPE_SIZE_UNIT (tem
) = TYPE_SIZE_UNIT (enumtype
);
7734 SET_TYPE_MODE (tem
, TYPE_MODE (enumtype
));
7735 TYPE_PRECISION (tem
) = TYPE_PRECISION (enumtype
);
7736 TYPE_ALIGN (tem
) = TYPE_ALIGN (enumtype
);
7737 TYPE_USER_ALIGN (tem
) = TYPE_USER_ALIGN (enumtype
);
7738 TYPE_UNSIGNED (tem
) = TYPE_UNSIGNED (enumtype
);
7739 TYPE_LANG_SPECIFIC (tem
) = TYPE_LANG_SPECIFIC (enumtype
);
7742 /* Finish debugging output for this type. */
7743 rest_of_type_compilation (enumtype
, toplevel
);
7745 /* If this enum is defined inside a struct, add it to
7748 && struct_parse_info
!= NULL
7749 && !in_sizeof
&& !in_typeof
&& !in_alignof
)
7750 struct_parse_info
->struct_types
.safe_push (enumtype
);
7755 /* Build and install a CONST_DECL for one value of the
7756 current enumeration type (one that was begun with start_enum).
7757 DECL_LOC is the location of the enumerator.
7758 LOC is the location of the '=' operator if any, DECL_LOC otherwise.
7759 Return a tree-list containing the CONST_DECL and its value.
7760 Assignment of sequential values by default is handled here. */
7763 build_enumerator (location_t decl_loc
, location_t loc
,
7764 struct c_enum_contents
*the_enum
, tree name
, tree value
)
7768 /* Validate and default VALUE. */
7772 /* Don't issue more errors for error_mark_node (i.e. an
7773 undeclared identifier) - just ignore the value expression. */
7774 if (value
== error_mark_node
)
7776 else if (!INTEGRAL_TYPE_P (TREE_TYPE (value
)))
7778 error_at (loc
, "enumerator value for %qE is not an integer constant",
7784 if (TREE_CODE (value
) != INTEGER_CST
)
7786 value
= c_fully_fold (value
, false, NULL
);
7787 if (TREE_CODE (value
) == INTEGER_CST
)
7788 pedwarn (loc
, OPT_Wpedantic
,
7789 "enumerator value for %qE is not an integer "
7790 "constant expression", name
);
7792 if (TREE_CODE (value
) != INTEGER_CST
)
7794 error ("enumerator value for %qE is not an integer constant",
7800 value
= default_conversion (value
);
7801 constant_expression_warning (value
);
7806 /* Default based on previous value. */
7807 /* It should no longer be possible to have NON_LVALUE_EXPR
7811 value
= the_enum
->enum_next_value
;
7812 if (the_enum
->enum_overflow
)
7813 error_at (loc
, "overflow in enumeration values");
7815 /* Even though the underlying type of an enum is unspecified, the
7816 type of enumeration constants is explicitly defined as int
7817 (6.4.4.3/2 in the C99 Standard). GCC allows any integer type as
7819 else if (!int_fits_type_p (value
, integer_type_node
))
7820 pedwarn (loc
, OPT_Wpedantic
,
7821 "ISO C restricts enumerator values to range of %<int%>");
7823 /* The ISO C Standard mandates enumerators to have type int, even
7824 though the underlying type of an enum type is unspecified.
7825 However, GCC allows enumerators of any integer type as an
7826 extensions. Here we convert any enumerators that fit in an int
7827 to type int, to avoid promotions to unsigned types when comparing
7828 integers with enumerators that fit in the int range. When
7829 -pedantic is given, we would have already warned about those that
7830 don't fit. We have to do this here rather than in finish_enum
7831 because this value may be used to define more enumerators. */
7832 if (int_fits_type_p (value
, integer_type_node
))
7833 value
= convert (integer_type_node
, value
);
7835 /* Set basis for default for next value. */
7836 the_enum
->enum_next_value
7837 = build_binary_op (EXPR_LOC_OR_LOC (value
, input_location
),
7838 PLUS_EXPR
, value
, integer_one_node
, 0);
7839 the_enum
->enum_overflow
= tree_int_cst_lt (the_enum
->enum_next_value
, value
);
7841 /* Now create a declaration for the enum value name. */
7843 type
= TREE_TYPE (value
);
7844 type
= c_common_type_for_size (MAX (TYPE_PRECISION (type
),
7845 TYPE_PRECISION (integer_type_node
)),
7846 (TYPE_PRECISION (type
)
7847 >= TYPE_PRECISION (integer_type_node
)
7848 && TYPE_UNSIGNED (type
)));
7850 decl
= build_decl (decl_loc
, CONST_DECL
, name
, type
);
7851 DECL_INITIAL (decl
) = convert (type
, value
);
7854 return tree_cons (decl
, value
, NULL_TREE
);
7858 /* Create the FUNCTION_DECL for a function definition.
7859 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
7860 the declaration; they describe the function's name and the type it returns,
7861 but twisted together in a fashion that parallels the syntax of C.
7863 This function creates a binding context for the function body
7864 as well as setting up the FUNCTION_DECL in current_function_decl.
7866 Returns 1 on success. If the DECLARATOR is not suitable for a function
7867 (it defines a datum instead), we return 0, which tells
7868 yyparse to report a parse error. */
7871 start_function (struct c_declspecs
*declspecs
, struct c_declarator
*declarator
,
7874 tree decl1
, old_decl
;
7875 tree restype
, resdecl
;
7878 current_function_returns_value
= 0; /* Assume, until we see it does. */
7879 current_function_returns_null
= 0;
7880 current_function_returns_abnormally
= 0;
7881 warn_about_return_type
= 0;
7882 c_switch_stack
= NULL
;
7884 /* Indicate no valid break/continue context by setting these variables
7885 to some non-null, non-label value. We'll notice and emit the proper
7886 error message in c_finish_bc_stmt. */
7887 c_break_label
= c_cont_label
= size_zero_node
;
7889 decl1
= grokdeclarator (declarator
, declspecs
, FUNCDEF
, true, NULL
,
7890 &attributes
, NULL
, NULL
, DEPRECATED_NORMAL
);
7892 /* If the declarator is not suitable for a function definition,
7893 cause a syntax error. */
7895 || TREE_CODE (decl1
) != FUNCTION_DECL
)
7898 loc
= DECL_SOURCE_LOCATION (decl1
);
7900 c_decl_attributes (&decl1
, attributes
, 0);
7902 if (DECL_DECLARED_INLINE_P (decl1
)
7903 && DECL_UNINLINABLE (decl1
)
7904 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1
)))
7905 warning_at (loc
, OPT_Wattributes
,
7906 "inline function %qD given attribute noinline",
7909 /* Handle gnu_inline attribute. */
7910 if (declspecs
->inline_p
7911 && !flag_gnu89_inline
7912 && TREE_CODE (decl1
) == FUNCTION_DECL
7913 && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl1
))
7914 || current_function_decl
))
7916 if (declspecs
->storage_class
!= csc_static
)
7917 DECL_EXTERNAL (decl1
) = !DECL_EXTERNAL (decl1
);
7920 announce_function (decl1
);
7922 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1
))))
7924 error_at (loc
, "return type is an incomplete type");
7925 /* Make it return void instead. */
7927 = build_function_type (void_type_node
,
7928 TYPE_ARG_TYPES (TREE_TYPE (decl1
)));
7931 if (warn_about_return_type
)
7932 pedwarn_c99 (loc
, flag_isoc99
? 0
7933 : (warn_return_type
? OPT_Wreturn_type
: OPT_Wimplicit_int
),
7934 "return type defaults to %<int%>");
7936 /* Make the init_value nonzero so pushdecl knows this is not tentative.
7937 error_mark_node is replaced below (in pop_scope) with the BLOCK. */
7938 DECL_INITIAL (decl1
) = error_mark_node
;
7940 /* A nested function is not global. */
7941 if (current_function_decl
!= 0)
7942 TREE_PUBLIC (decl1
) = 0;
7944 /* If this definition isn't a prototype and we had a prototype declaration
7945 before, copy the arg type info from that prototype. */
7946 old_decl
= lookup_name_in_scope (DECL_NAME (decl1
), current_scope
);
7947 if (old_decl
&& TREE_CODE (old_decl
) != FUNCTION_DECL
)
7949 current_function_prototype_locus
= UNKNOWN_LOCATION
;
7950 current_function_prototype_built_in
= false;
7951 current_function_prototype_arg_types
= NULL_TREE
;
7952 if (!prototype_p (TREE_TYPE (decl1
)))
7954 if (old_decl
!= 0 && TREE_CODE (TREE_TYPE (old_decl
)) == FUNCTION_TYPE
7955 && comptypes (TREE_TYPE (TREE_TYPE (decl1
)),
7956 TREE_TYPE (TREE_TYPE (old_decl
))))
7958 TREE_TYPE (decl1
) = composite_type (TREE_TYPE (old_decl
),
7960 current_function_prototype_locus
= DECL_SOURCE_LOCATION (old_decl
);
7961 current_function_prototype_built_in
7962 = C_DECL_BUILTIN_PROTOTYPE (old_decl
);
7963 current_function_prototype_arg_types
7964 = TYPE_ARG_TYPES (TREE_TYPE (decl1
));
7966 if (TREE_PUBLIC (decl1
))
7968 /* If there is an external prototype declaration of this
7969 function, record its location but do not copy information
7970 to this decl. This may be an invisible declaration
7971 (built-in or in a scope which has finished) or simply
7972 have more refined argument types than any declaration
7974 struct c_binding
*b
;
7975 for (b
= I_SYMBOL_BINDING (DECL_NAME (decl1
)); b
; b
= b
->shadowed
)
7976 if (B_IN_SCOPE (b
, external_scope
))
7980 tree ext_decl
, ext_type
;
7982 ext_type
= b
->u
.type
? b
->u
.type
: TREE_TYPE (ext_decl
);
7983 if (TREE_CODE (ext_type
) == FUNCTION_TYPE
7984 && comptypes (TREE_TYPE (TREE_TYPE (decl1
)),
7985 TREE_TYPE (ext_type
)))
7987 current_function_prototype_locus
7988 = DECL_SOURCE_LOCATION (ext_decl
);
7989 current_function_prototype_built_in
7990 = C_DECL_BUILTIN_PROTOTYPE (ext_decl
);
7991 current_function_prototype_arg_types
7992 = TYPE_ARG_TYPES (ext_type
);
7998 /* Optionally warn of old-fashioned def with no previous prototype. */
7999 if (warn_strict_prototypes
8000 && old_decl
!= error_mark_node
8001 && !prototype_p (TREE_TYPE (decl1
))
8002 && C_DECL_ISNT_PROTOTYPE (old_decl
))
8003 warning_at (loc
, OPT_Wstrict_prototypes
,
8004 "function declaration isn%'t a prototype");
8005 /* Optionally warn of any global def with no previous prototype. */
8006 else if (warn_missing_prototypes
8007 && old_decl
!= error_mark_node
8008 && TREE_PUBLIC (decl1
)
8009 && !MAIN_NAME_P (DECL_NAME (decl1
))
8010 && C_DECL_ISNT_PROTOTYPE (old_decl
)
8011 && !DECL_DECLARED_INLINE_P (decl1
))
8012 warning_at (loc
, OPT_Wmissing_prototypes
,
8013 "no previous prototype for %qD", decl1
);
8014 /* Optionally warn of any def with no previous prototype
8015 if the function has already been used. */
8016 else if (warn_missing_prototypes
8018 && old_decl
!= error_mark_node
8019 && TREE_USED (old_decl
)
8020 && !prototype_p (TREE_TYPE (old_decl
)))
8021 warning_at (loc
, OPT_Wmissing_prototypes
,
8022 "%qD was used with no prototype before its definition", decl1
);
8023 /* Optionally warn of any global def with no previous declaration. */
8024 else if (warn_missing_declarations
8025 && TREE_PUBLIC (decl1
)
8027 && !MAIN_NAME_P (DECL_NAME (decl1
)))
8028 warning_at (loc
, OPT_Wmissing_declarations
,
8029 "no previous declaration for %qD",
8031 /* Optionally warn of any def with no previous declaration
8032 if the function has already been used. */
8033 else if (warn_missing_declarations
8035 && old_decl
!= error_mark_node
8036 && TREE_USED (old_decl
)
8037 && C_DECL_IMPLICIT (old_decl
))
8038 warning_at (loc
, OPT_Wmissing_declarations
,
8039 "%qD was used with no declaration before its definition", decl1
);
8041 /* This function exists in static storage.
8042 (This does not mean `static' in the C sense!) */
8043 TREE_STATIC (decl1
) = 1;
8045 /* This is the earliest point at which we might know the assembler
8046 name of the function. Thus, if it's set before this, die horribly. */
8047 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl1
));
8049 /* If #pragma weak was used, mark the decl weak now. */
8050 if (current_scope
== file_scope
)
8051 maybe_apply_pragma_weak (decl1
);
8053 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
8054 if (warn_main
&& MAIN_NAME_P (DECL_NAME (decl1
)))
8056 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1
)))
8057 != integer_type_node
)
8058 pedwarn (loc
, OPT_Wmain
, "return type of %qD is not %<int%>", decl1
);
8059 else if (TYPE_ATOMIC (TREE_TYPE (TREE_TYPE (decl1
))))
8060 pedwarn (loc
, OPT_Wmain
, "%<_Atomic%>-qualified return type of %qD",
8063 check_main_parameter_types (decl1
);
8065 if (!TREE_PUBLIC (decl1
))
8066 pedwarn (loc
, OPT_Wmain
,
8067 "%qD is normally a non-static function", decl1
);
8070 /* Record the decl so that the function name is defined.
8071 If we already have a decl for this name, and it is a FUNCTION_DECL,
8072 use the old decl. */
8074 current_function_decl
= pushdecl (decl1
);
8077 declare_parm_level ();
8079 restype
= TREE_TYPE (TREE_TYPE (current_function_decl
));
8080 resdecl
= build_decl (loc
, RESULT_DECL
, NULL_TREE
, restype
);
8081 DECL_ARTIFICIAL (resdecl
) = 1;
8082 DECL_IGNORED_P (resdecl
) = 1;
8083 DECL_RESULT (current_function_decl
) = resdecl
;
8085 start_fname_decls ();
8090 /* Subroutine of store_parm_decls which handles new-style function
8091 definitions (prototype format). The parms already have decls, so we
8092 need only record them as in effect and complain if any redundant
8093 old-style parm decls were written. */
8095 store_parm_decls_newstyle (tree fndecl
, const struct c_arg_info
*arg_info
)
8101 if (current_scope
->bindings
)
8103 error_at (DECL_SOURCE_LOCATION (fndecl
),
8104 "old-style parameter declarations in prototyped "
8105 "function definition");
8107 /* Get rid of the old-style declarations. */
8111 /* Don't issue this warning for nested functions, and don't issue this
8112 warning if we got here because ARG_INFO_TYPES was error_mark_node
8113 (this happens when a function definition has just an ellipsis in
8114 its parameter list). */
8115 else if (!in_system_header_at (input_location
)
8116 && !current_function_scope
8117 && arg_info
->types
!= error_mark_node
)
8118 warning_at (DECL_SOURCE_LOCATION (fndecl
), OPT_Wtraditional
,
8119 "traditional C rejects ISO C style function definitions");
8121 /* Now make all the parameter declarations visible in the function body.
8122 We can bypass most of the grunt work of pushdecl. */
8123 for (decl
= arg_info
->parms
; decl
; decl
= DECL_CHAIN (decl
))
8125 DECL_CONTEXT (decl
) = current_function_decl
;
8126 if (DECL_NAME (decl
))
8128 bind (DECL_NAME (decl
), decl
, current_scope
,
8129 /*invisible=*/false, /*nested=*/false,
8131 if (!TREE_USED (decl
))
8132 warn_if_shadowing (decl
);
8135 error_at (DECL_SOURCE_LOCATION (decl
), "parameter name omitted");
8138 /* Record the parameter list in the function declaration. */
8139 DECL_ARGUMENTS (fndecl
) = arg_info
->parms
;
8141 /* Now make all the ancillary declarations visible, likewise. */
8142 for (decl
= arg_info
->others
; decl
; decl
= DECL_CHAIN (decl
))
8144 DECL_CONTEXT (decl
) = current_function_decl
;
8145 if (DECL_NAME (decl
))
8146 bind (DECL_NAME (decl
), decl
, current_scope
,
8147 /*invisible=*/false,
8148 /*nested=*/(TREE_CODE (decl
) == FUNCTION_DECL
),
8152 /* And all the tag declarations. */
8153 FOR_EACH_VEC_SAFE_ELT_REVERSE (arg_info
->tags
, ix
, tag
)
8155 bind (tag
->id
, tag
->type
, current_scope
,
8156 /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION
);
8159 /* Subroutine of store_parm_decls which handles old-style function
8160 definitions (separate parameter list and declarations). */
8163 store_parm_decls_oldstyle (tree fndecl
, const struct c_arg_info
*arg_info
)
8165 struct c_binding
*b
;
8166 tree parm
, decl
, last
;
8167 tree parmids
= arg_info
->parms
;
8168 struct pointer_set_t
*seen_args
= pointer_set_create ();
8170 if (!in_system_header_at (input_location
))
8171 warning_at (DECL_SOURCE_LOCATION (fndecl
),
8172 OPT_Wold_style_definition
, "old-style function definition");
8174 /* Match each formal parameter name with its declaration. Save each
8175 decl in the appropriate TREE_PURPOSE slot of the parmids chain. */
8176 for (parm
= parmids
; parm
; parm
= TREE_CHAIN (parm
))
8178 if (TREE_VALUE (parm
) == 0)
8180 error_at (DECL_SOURCE_LOCATION (fndecl
),
8181 "parameter name missing from parameter list");
8182 TREE_PURPOSE (parm
) = 0;
8186 b
= I_SYMBOL_BINDING (TREE_VALUE (parm
));
8187 if (b
&& B_IN_CURRENT_SCOPE (b
))
8190 /* Skip erroneous parameters. */
8191 if (decl
== error_mark_node
)
8193 /* If we got something other than a PARM_DECL it is an error. */
8194 if (TREE_CODE (decl
) != PARM_DECL
)
8195 error_at (DECL_SOURCE_LOCATION (decl
),
8196 "%qD declared as a non-parameter", decl
);
8197 /* If the declaration is already marked, we have a duplicate
8198 name. Complain and ignore the duplicate. */
8199 else if (pointer_set_contains (seen_args
, decl
))
8201 error_at (DECL_SOURCE_LOCATION (decl
),
8202 "multiple parameters named %qD", decl
);
8203 TREE_PURPOSE (parm
) = 0;
8206 /* If the declaration says "void", complain and turn it into
8208 else if (VOID_TYPE_P (TREE_TYPE (decl
)))
8210 error_at (DECL_SOURCE_LOCATION (decl
),
8211 "parameter %qD declared with void type", decl
);
8212 TREE_TYPE (decl
) = integer_type_node
;
8213 DECL_ARG_TYPE (decl
) = integer_type_node
;
8214 layout_decl (decl
, 0);
8216 warn_if_shadowing (decl
);
8218 /* If no declaration found, default to int. */
8221 /* FIXME diagnostics: This should be the location of the argument,
8222 not the FNDECL. E.g., for an old-style declaration
8224 int f10(v) { blah; }
8226 We should use the location of the V, not the F10.
8227 Unfortunately, the V is an IDENTIFIER_NODE which has no
8228 location. In the future we need locations for c_arg_info
8231 See gcc.dg/Wshadow-3.c for an example of this problem. */
8232 decl
= build_decl (DECL_SOURCE_LOCATION (fndecl
),
8233 PARM_DECL
, TREE_VALUE (parm
), integer_type_node
);
8234 DECL_ARG_TYPE (decl
) = TREE_TYPE (decl
);
8236 warn_if_shadowing (decl
);
8239 pedwarn (DECL_SOURCE_LOCATION (decl
),
8240 0, "type of %qD defaults to %<int%>", decl
);
8242 warning_at (DECL_SOURCE_LOCATION (decl
),
8243 OPT_Wmissing_parameter_type
,
8244 "type of %qD defaults to %<int%>", decl
);
8247 TREE_PURPOSE (parm
) = decl
;
8248 pointer_set_insert (seen_args
, decl
);
8251 /* Now examine the parms chain for incomplete declarations
8252 and declarations with no corresponding names. */
8254 for (b
= current_scope
->bindings
; b
; b
= b
->prev
)
8257 if (TREE_CODE (parm
) != PARM_DECL
)
8260 if (TREE_TYPE (parm
) != error_mark_node
8261 && !COMPLETE_TYPE_P (TREE_TYPE (parm
)))
8263 error_at (DECL_SOURCE_LOCATION (parm
),
8264 "parameter %qD has incomplete type", parm
);
8265 TREE_TYPE (parm
) = error_mark_node
;
8268 if (!pointer_set_contains (seen_args
, parm
))
8270 error_at (DECL_SOURCE_LOCATION (parm
),
8271 "declaration for parameter %qD but no such parameter",
8274 /* Pretend the parameter was not missing.
8275 This gets us to a standard state and minimizes
8276 further error messages. */
8277 parmids
= chainon (parmids
, tree_cons (parm
, 0, 0));
8281 /* Chain the declarations together in the order of the list of
8282 names. Store that chain in the function decl, replacing the
8283 list of names. Update the current scope to match. */
8284 DECL_ARGUMENTS (fndecl
) = 0;
8286 for (parm
= parmids
; parm
; parm
= TREE_CHAIN (parm
))
8287 if (TREE_PURPOSE (parm
))
8289 if (parm
&& TREE_PURPOSE (parm
))
8291 last
= TREE_PURPOSE (parm
);
8292 DECL_ARGUMENTS (fndecl
) = last
;
8294 for (parm
= TREE_CHAIN (parm
); parm
; parm
= TREE_CHAIN (parm
))
8295 if (TREE_PURPOSE (parm
))
8297 DECL_CHAIN (last
) = TREE_PURPOSE (parm
);
8298 last
= TREE_PURPOSE (parm
);
8300 DECL_CHAIN (last
) = 0;
8303 pointer_set_destroy (seen_args
);
8305 /* If there was a previous prototype,
8306 set the DECL_ARG_TYPE of each argument according to
8307 the type previously specified, and report any mismatches. */
8309 if (current_function_prototype_arg_types
)
8312 for (parm
= DECL_ARGUMENTS (fndecl
),
8313 type
= current_function_prototype_arg_types
;
8314 parm
|| (type
&& TREE_VALUE (type
) != error_mark_node
8315 && (TYPE_MAIN_VARIANT (TREE_VALUE (type
)) != void_type_node
));
8316 parm
= DECL_CHAIN (parm
), type
= TREE_CHAIN (type
))
8318 if (parm
== 0 || type
== 0
8319 || TYPE_MAIN_VARIANT (TREE_VALUE (type
)) == void_type_node
)
8321 if (current_function_prototype_built_in
)
8322 warning_at (DECL_SOURCE_LOCATION (fndecl
),
8323 0, "number of arguments doesn%'t match "
8324 "built-in prototype");
8327 /* FIXME diagnostics: This should be the location of
8328 FNDECL, but there is bug when a prototype is
8329 declared inside function context, but defined
8330 outside of it (e.g., gcc.dg/pr15698-2.c). In
8331 which case FNDECL gets the location of the
8332 prototype, not the definition. */
8333 error_at (input_location
,
8334 "number of arguments doesn%'t match prototype");
8336 error_at (current_function_prototype_locus
,
8337 "prototype declaration");
8341 /* Type for passing arg must be consistent with that
8342 declared for the arg. ISO C says we take the unqualified
8343 type for parameters declared with qualified type. */
8344 if (TREE_TYPE (parm
) != error_mark_node
8345 && TREE_TYPE (type
) != error_mark_node
8346 && ((TYPE_ATOMIC (DECL_ARG_TYPE (parm
))
8347 != TYPE_ATOMIC (TREE_VALUE (type
)))
8348 || !comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm
)),
8349 TYPE_MAIN_VARIANT (TREE_VALUE (type
)))))
8351 if ((TYPE_ATOMIC (DECL_ARG_TYPE (parm
))
8352 == TYPE_ATOMIC (TREE_VALUE (type
)))
8353 && (TYPE_MAIN_VARIANT (TREE_TYPE (parm
))
8354 == TYPE_MAIN_VARIANT (TREE_VALUE (type
))))
8356 /* Adjust argument to match prototype. E.g. a previous
8357 `int foo(float);' prototype causes
8358 `int foo(x) float x; {...}' to be treated like
8359 `int foo(float x) {...}'. This is particularly
8360 useful for argument types like uid_t. */
8361 DECL_ARG_TYPE (parm
) = TREE_TYPE (parm
);
8363 if (targetm
.calls
.promote_prototypes (TREE_TYPE (current_function_decl
))
8364 && INTEGRAL_TYPE_P (TREE_TYPE (parm
))
8365 && TYPE_PRECISION (TREE_TYPE (parm
))
8366 < TYPE_PRECISION (integer_type_node
))
8367 DECL_ARG_TYPE (parm
)
8368 = c_type_promotes_to (TREE_TYPE (parm
));
8370 /* ??? Is it possible to get here with a
8371 built-in prototype or will it always have
8372 been diagnosed as conflicting with an
8373 old-style definition and discarded? */
8374 if (current_function_prototype_built_in
)
8375 warning_at (DECL_SOURCE_LOCATION (parm
),
8376 OPT_Wpedantic
, "promoted argument %qD "
8377 "doesn%'t match built-in prototype", parm
);
8380 pedwarn (DECL_SOURCE_LOCATION (parm
),
8381 OPT_Wpedantic
, "promoted argument %qD "
8382 "doesn%'t match prototype", parm
);
8383 pedwarn (current_function_prototype_locus
, OPT_Wpedantic
,
8384 "prototype declaration");
8389 if (current_function_prototype_built_in
)
8390 warning_at (DECL_SOURCE_LOCATION (parm
),
8391 0, "argument %qD doesn%'t match "
8392 "built-in prototype", parm
);
8395 error_at (DECL_SOURCE_LOCATION (parm
),
8396 "argument %qD doesn%'t match prototype", parm
);
8397 error_at (current_function_prototype_locus
,
8398 "prototype declaration");
8403 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl
)) = 0;
8406 /* Otherwise, create a prototype that would match. */
8410 tree actual
= 0, last
= 0, type
;
8412 for (parm
= DECL_ARGUMENTS (fndecl
); parm
; parm
= DECL_CHAIN (parm
))
8414 type
= tree_cons (NULL_TREE
, DECL_ARG_TYPE (parm
), NULL_TREE
);
8416 TREE_CHAIN (last
) = type
;
8421 type
= tree_cons (NULL_TREE
, void_type_node
, NULL_TREE
);
8423 TREE_CHAIN (last
) = type
;
8427 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
8428 of the type of this function, but we need to avoid having this
8429 affect the types of other similarly-typed functions, so we must
8430 first force the generation of an identical (but separate) type
8431 node for the relevant function type. The new node we create
8432 will be a variant of the main variant of the original function
8435 TREE_TYPE (fndecl
) = build_variant_type_copy (TREE_TYPE (fndecl
));
8437 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl
)) = actual
;
8441 /* Store parameter declarations passed in ARG_INFO into the current
8442 function declaration. */
8445 store_parm_decls_from (struct c_arg_info
*arg_info
)
8447 current_function_arg_info
= arg_info
;
8448 store_parm_decls ();
8451 /* Store the parameter declarations into the current function declaration.
8452 This is called after parsing the parameter declarations, before
8453 digesting the body of the function.
8455 For an old-style definition, construct a prototype out of the old-style
8456 parameter declarations and inject it into the function's type. */
8459 store_parm_decls (void)
8461 tree fndecl
= current_function_decl
;
8464 /* The argument information block for FNDECL. */
8465 struct c_arg_info
*arg_info
= current_function_arg_info
;
8466 current_function_arg_info
= 0;
8468 /* True if this definition is written with a prototype. Note:
8469 despite C99 6.7.5.3p14, we can *not* treat an empty argument
8470 list in a function definition as equivalent to (void) -- an
8471 empty argument list specifies the function has no parameters,
8472 but only (void) sets up a prototype for future calls. */
8473 proto
= arg_info
->types
!= 0;
8476 store_parm_decls_newstyle (fndecl
, arg_info
);
8478 store_parm_decls_oldstyle (fndecl
, arg_info
);
8480 /* The next call to push_scope will be a function body. */
8482 next_is_function_body
= true;
8484 /* Write a record describing this function definition to the prototypes
8485 file (if requested). */
8487 gen_aux_info_record (fndecl
, 1, 0, proto
);
8489 /* Initialize the RTL code for the function. */
8490 allocate_struct_function (fndecl
, false);
8492 if (warn_unused_local_typedefs
)
8493 cfun
->language
= ggc_cleared_alloc
<language_function
> ();
8495 /* Begin the statement tree for this function. */
8496 DECL_SAVED_TREE (fndecl
) = push_stmt_list ();
8498 /* ??? Insert the contents of the pending sizes list into the function
8499 to be evaluated. The only reason left to have this is
8500 void foo(int n, int array[n++])
8501 because we throw away the array type in favor of a pointer type, and
8502 thus won't naturally see the SAVE_EXPR containing the increment. All
8503 other pending sizes would be handled by gimplify_parameters. */
8504 if (arg_info
->pending_sizes
)
8505 add_stmt (arg_info
->pending_sizes
);
8508 /* Store PARM_DECLs in PARMS into scope temporarily. Used for
8509 c_finish_omp_declare_simd for function prototypes. No diagnostics
8513 temp_store_parm_decls (tree fndecl
, tree parms
)
8516 for (tree p
= parms
; p
; p
= DECL_CHAIN (p
))
8518 DECL_CONTEXT (p
) = fndecl
;
8520 bind (DECL_NAME (p
), p
, current_scope
,
8521 /*invisible=*/false, /*nested=*/false,
8526 /* Undo what temp_store_parm_decls did. */
8529 temp_pop_parm_decls (void)
8531 /* Clear all bindings in this temporary scope, so that
8532 pop_scope doesn't create a BLOCK. */
8533 struct c_binding
*b
= current_scope
->bindings
;
8534 current_scope
->bindings
= NULL
;
8535 for (; b
; b
= free_binding_and_advance (b
))
8537 gcc_assert (TREE_CODE (b
->decl
) == PARM_DECL
);
8538 gcc_assert (I_SYMBOL_BINDING (b
->id
) == b
);
8539 I_SYMBOL_BINDING (b
->id
) = b
->shadowed
;
8540 if (b
->shadowed
&& b
->shadowed
->u
.type
)
8541 TREE_TYPE (b
->shadowed
->decl
) = b
->shadowed
->u
.type
;
8547 /* Finish up a function declaration and compile that function
8548 all the way to assembler language output. Then free the storage
8549 for the function definition.
8551 This is called after parsing the body of the function definition. */
8554 finish_function (void)
8556 tree fndecl
= current_function_decl
;
8558 if (c_dialect_objc ())
8559 objc_finish_function ();
8561 if (TREE_CODE (fndecl
) == FUNCTION_DECL
8562 && targetm
.calls
.promote_prototypes (TREE_TYPE (fndecl
)))
8564 tree args
= DECL_ARGUMENTS (fndecl
);
8565 for (; args
; args
= DECL_CHAIN (args
))
8567 tree type
= TREE_TYPE (args
);
8568 if (INTEGRAL_TYPE_P (type
)
8569 && TYPE_PRECISION (type
) < TYPE_PRECISION (integer_type_node
))
8570 DECL_ARG_TYPE (args
) = c_type_promotes_to (type
);
8574 if (DECL_INITIAL (fndecl
) && DECL_INITIAL (fndecl
) != error_mark_node
)
8575 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl
)) = fndecl
;
8577 /* Must mark the RESULT_DECL as being in this function. */
8579 if (DECL_RESULT (fndecl
) && DECL_RESULT (fndecl
) != error_mark_node
)
8580 DECL_CONTEXT (DECL_RESULT (fndecl
)) = fndecl
;
8582 if (MAIN_NAME_P (DECL_NAME (fndecl
)) && flag_hosted
8583 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl
)))
8584 == integer_type_node
&& flag_isoc99
)
8586 /* Hack. We don't want the middle-end to warn that this return
8587 is unreachable, so we mark its location as special. Using
8588 UNKNOWN_LOCATION has the problem that it gets clobbered in
8589 annotate_one_with_locus. A cleaner solution might be to
8590 ensure ! should_carry_locus_p (stmt), but that needs a flag.
8592 c_finish_return (BUILTINS_LOCATION
, integer_zero_node
, NULL_TREE
);
8595 /* Tie off the statement tree for this function. */
8596 DECL_SAVED_TREE (fndecl
) = pop_stmt_list (DECL_SAVED_TREE (fndecl
));
8598 /* If the function has _Cilk_spawn in front of a function call inside it
8599 i.e. it is a spawning function, then add the appropriate Cilk plus
8600 functions inside. */
8601 if (fn_contains_cilk_spawn_p (cfun
))
8602 cfun
->cilk_frame_decl
= insert_cilk_frame (fndecl
);
8604 finish_fname_decls ();
8606 /* Complain if there's just no return statement. */
8607 if (warn_return_type
8608 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl
))) != VOID_TYPE
8609 && !current_function_returns_value
&& !current_function_returns_null
8610 /* Don't complain if we are no-return. */
8611 && !current_function_returns_abnormally
8612 /* Don't complain if we are declared noreturn. */
8613 && !TREE_THIS_VOLATILE (fndecl
)
8614 /* Don't warn for main(). */
8615 && !MAIN_NAME_P (DECL_NAME (fndecl
))
8616 /* Or if they didn't actually specify a return type. */
8617 && !C_FUNCTION_IMPLICIT_INT (fndecl
)
8618 /* Normally, with -Wreturn-type, flow will complain, but we might
8619 optimize out static functions. */
8620 && !TREE_PUBLIC (fndecl
))
8622 warning (OPT_Wreturn_type
,
8623 "no return statement in function returning non-void");
8624 TREE_NO_WARNING (fndecl
) = 1;
8627 /* Complain about parameters that are only set, but never otherwise used. */
8628 if (warn_unused_but_set_parameter
)
8632 for (decl
= DECL_ARGUMENTS (fndecl
);
8634 decl
= DECL_CHAIN (decl
))
8635 if (TREE_USED (decl
)
8636 && TREE_CODE (decl
) == PARM_DECL
8637 && !DECL_READ_P (decl
)
8639 && !DECL_ARTIFICIAL (decl
)
8640 && !TREE_NO_WARNING (decl
))
8641 warning_at (DECL_SOURCE_LOCATION (decl
),
8642 OPT_Wunused_but_set_parameter
,
8643 "parameter %qD set but not used", decl
);
8646 /* Complain about locally defined typedefs that are not used in this
8648 maybe_warn_unused_local_typedefs ();
8650 /* Store the end of the function, so that we get good line number
8651 info for the epilogue. */
8652 cfun
->function_end_locus
= input_location
;
8654 /* Finalize the ELF visibility for the function. */
8655 c_determine_visibility (fndecl
);
8657 /* For GNU C extern inline functions disregard inline limits. */
8658 if (DECL_EXTERNAL (fndecl
)
8659 && DECL_DECLARED_INLINE_P (fndecl
))
8660 DECL_DISREGARD_INLINE_LIMITS (fndecl
) = 1;
8662 /* Genericize before inlining. Delay genericizing nested functions
8663 until their parent function is genericized. Since finalizing
8664 requires GENERIC, delay that as well. */
8666 if (DECL_INITIAL (fndecl
) && DECL_INITIAL (fndecl
) != error_mark_node
8667 && !undef_nested_function
)
8669 if (!decl_function_context (fndecl
))
8671 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE
, fndecl
);
8672 c_genericize (fndecl
);
8674 /* ??? Objc emits functions after finalizing the compilation unit.
8675 This should be cleaned up later and this conditional removed. */
8676 if (cgraph_global_info_ready
)
8678 cgraph_add_new_function (fndecl
, false);
8681 cgraph_finalize_function (fndecl
, false);
8685 /* Register this function with cgraph just far enough to get it
8686 added to our parent's nested function list. Handy, since the
8687 C front end doesn't have such a list. */
8688 (void) cgraph_get_create_node (fndecl
);
8692 if (!decl_function_context (fndecl
))
8693 undef_nested_function
= false;
8695 if (cfun
->language
!= NULL
)
8697 ggc_free (cfun
->language
);
8698 cfun
->language
= NULL
;
8701 /* We're leaving the context of this function, so zap cfun.
8702 It's still in DECL_STRUCT_FUNCTION, and we'll restore it in
8703 tree_rest_of_compilation. */
8705 current_function_decl
= NULL
;
8708 /* Check the declarations given in a for-loop for satisfying the C99
8709 constraints. If exactly one such decl is found, return it. LOC is
8710 the location of the opening parenthesis of the for loop. The last
8711 parameter allows you to control the "for loop initial declarations
8712 are only allowed in C99 mode". Normally, you should pass
8713 flag_isoc99 as that parameter. But in some cases (Objective-C
8714 foreach loop, for example) we want to run the checks in this
8715 function even if not in C99 mode, so we allow the caller to turn
8716 off the error about not being in C99 mode.
8720 check_for_loop_decls (location_t loc
, bool turn_off_iso_c99_error
)
8722 struct c_binding
*b
;
8723 tree one_decl
= NULL_TREE
;
8726 if (!turn_off_iso_c99_error
)
8728 static bool hint
= true;
8729 /* If we get here, declarations have been used in a for loop without
8730 the C99 for loop scope. This doesn't make much sense, so don't
8732 error_at (loc
, "%<for%> loop initial declarations "
8733 "are only allowed in C99 or C11 mode");
8737 "use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 "
8738 "to compile your code");
8743 /* C99 subclause 6.8.5 paragraph 3:
8745 [#3] The declaration part of a for statement shall only
8746 declare identifiers for objects having storage class auto or
8749 It isn't clear whether, in this sentence, "identifiers" binds to
8750 "shall only declare" or to "objects" - that is, whether all identifiers
8751 declared must be identifiers for objects, or whether the restriction
8752 only applies to those that are. (A question on this in comp.std.c
8753 in November 2000 received no answer.) We implement the strictest
8754 interpretation, to avoid creating an extension which later causes
8757 for (b
= current_scope
->bindings
; b
; b
= b
->prev
)
8760 tree decl
= b
->decl
;
8765 switch (TREE_CODE (decl
))
8769 location_t decl_loc
= DECL_SOURCE_LOCATION (decl
);
8770 if (TREE_STATIC (decl
))
8772 "declaration of static variable %qD in %<for%> loop "
8773 "initial declaration", decl
);
8774 else if (DECL_EXTERNAL (decl
))
8776 "declaration of %<extern%> variable %qD in %<for%> loop "
8777 "initial declaration", decl
);
8783 "%<struct %E%> declared in %<for%> loop initial "
8788 "%<union %E%> declared in %<for%> loop initial declaration",
8792 error_at (loc
, "%<enum %E%> declared in %<for%> loop "
8793 "initial declaration", id
);
8796 error_at (loc
, "declaration of non-variable "
8797 "%qD in %<for%> loop initial declaration", decl
);
8804 return n_decls
== 1 ? one_decl
: NULL_TREE
;
8807 /* Save and reinitialize the variables
8808 used during compilation of a C function. */
8811 c_push_function_context (void)
8813 struct language_function
*p
= cfun
->language
;
8814 /* cfun->language might have been already allocated by the use of
8815 -Wunused-local-typedefs. In that case, just re-use it. */
8817 cfun
->language
= p
= ggc_cleared_alloc
<language_function
> ();
8819 p
->base
.x_stmt_tree
= c_stmt_tree
;
8820 c_stmt_tree
.x_cur_stmt_list
= vec_safe_copy (c_stmt_tree
.x_cur_stmt_list
);
8821 p
->x_break_label
= c_break_label
;
8822 p
->x_cont_label
= c_cont_label
;
8823 p
->x_switch_stack
= c_switch_stack
;
8824 p
->arg_info
= current_function_arg_info
;
8825 p
->returns_value
= current_function_returns_value
;
8826 p
->returns_null
= current_function_returns_null
;
8827 p
->returns_abnormally
= current_function_returns_abnormally
;
8828 p
->warn_about_return_type
= warn_about_return_type
;
8830 push_function_context ();
8833 /* Restore the variables used during compilation of a C function. */
8836 c_pop_function_context (void)
8838 struct language_function
*p
;
8840 pop_function_context ();
8843 /* When -Wunused-local-typedefs is in effect, cfun->languages is
8844 used to store data throughout the life time of the current cfun,
8845 So don't deallocate it. */
8846 if (!warn_unused_local_typedefs
)
8847 cfun
->language
= NULL
;
8849 if (DECL_STRUCT_FUNCTION (current_function_decl
) == 0
8850 && DECL_SAVED_TREE (current_function_decl
) == NULL_TREE
)
8852 /* Stop pointing to the local nodes about to be freed. */
8853 /* But DECL_INITIAL must remain nonzero so we know this
8854 was an actual function definition. */
8855 DECL_INITIAL (current_function_decl
) = error_mark_node
;
8856 DECL_ARGUMENTS (current_function_decl
) = 0;
8859 c_stmt_tree
= p
->base
.x_stmt_tree
;
8860 p
->base
.x_stmt_tree
.x_cur_stmt_list
= NULL
;
8861 c_break_label
= p
->x_break_label
;
8862 c_cont_label
= p
->x_cont_label
;
8863 c_switch_stack
= p
->x_switch_stack
;
8864 current_function_arg_info
= p
->arg_info
;
8865 current_function_returns_value
= p
->returns_value
;
8866 current_function_returns_null
= p
->returns_null
;
8867 current_function_returns_abnormally
= p
->returns_abnormally
;
8868 warn_about_return_type
= p
->warn_about_return_type
;
8871 /* The functions below are required for functionality of doing
8872 function at once processing in the C front end. Currently these
8873 functions are not called from anywhere in the C front end, but as
8874 these changes continue, that will change. */
8876 /* Returns the stmt_tree (if any) to which statements are currently
8877 being added. If there is no active statement-tree, NULL is
8881 current_stmt_tree (void)
8883 return &c_stmt_tree
;
8886 /* Return the global value of T as a symbol. */
8889 identifier_global_value (tree t
)
8891 struct c_binding
*b
;
8893 for (b
= I_SYMBOL_BINDING (t
); b
; b
= b
->shadowed
)
8894 if (B_IN_FILE_SCOPE (b
) || B_IN_EXTERNAL_SCOPE (b
))
8900 /* In C, the only C-linkage public declaration is at file scope. */
8903 c_linkage_bindings (tree name
)
8905 return identifier_global_value (name
);
8908 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
8909 otherwise the name is found in ridpointers from RID_INDEX. */
8912 record_builtin_type (enum rid rid_index
, const char *name
, tree type
)
8916 id
= ridpointers
[(int) rid_index
];
8918 id
= get_identifier (name
);
8919 decl
= build_decl (UNKNOWN_LOCATION
, TYPE_DECL
, id
, type
);
8921 if (debug_hooks
->type_decl
)
8922 debug_hooks
->type_decl (decl
, false);
8925 /* Build the void_list_node (void_type_node having been created). */
8927 build_void_list_node (void)
8929 tree t
= build_tree_list (NULL_TREE
, void_type_node
);
8933 /* Return a c_parm structure with the given SPECS, ATTRS and DECLARATOR. */
8936 build_c_parm (struct c_declspecs
*specs
, tree attrs
,
8937 struct c_declarator
*declarator
)
8939 struct c_parm
*ret
= XOBNEW (&parser_obstack
, struct c_parm
);
8942 ret
->declarator
= declarator
;
8946 /* Return a declarator with nested attributes. TARGET is the inner
8947 declarator to which these attributes apply. ATTRS are the
8950 struct c_declarator
*
8951 build_attrs_declarator (tree attrs
, struct c_declarator
*target
)
8953 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
8954 ret
->kind
= cdk_attrs
;
8955 ret
->declarator
= target
;
8956 ret
->u
.attrs
= attrs
;
8960 /* Return a declarator for a function with arguments specified by ARGS
8961 and return type specified by TARGET. */
8963 struct c_declarator
*
8964 build_function_declarator (struct c_arg_info
*args
,
8965 struct c_declarator
*target
)
8967 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
8968 ret
->kind
= cdk_function
;
8969 ret
->declarator
= target
;
8970 ret
->u
.arg_info
= args
;
8974 /* Return a declarator for the identifier IDENT (which may be
8975 NULL_TREE for an abstract declarator). */
8977 struct c_declarator
*
8978 build_id_declarator (tree ident
)
8980 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
8982 ret
->declarator
= 0;
8984 /* Default value - may get reset to a more precise location. */
8985 ret
->id_loc
= input_location
;
8989 /* Return something to represent absolute declarators containing a *.
8990 TARGET is the absolute declarator that the * contains.
8991 TYPE_QUALS_ATTRS is a structure for type qualifiers and attributes
8992 to apply to the pointer type. */
8994 struct c_declarator
*
8995 make_pointer_declarator (struct c_declspecs
*type_quals_attrs
,
8996 struct c_declarator
*target
)
9000 struct c_declarator
*itarget
= target
;
9001 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
9002 if (type_quals_attrs
)
9004 attrs
= type_quals_attrs
->attrs
;
9005 quals
= quals_from_declspecs (type_quals_attrs
);
9006 if (attrs
!= NULL_TREE
)
9007 itarget
= build_attrs_declarator (attrs
, target
);
9009 ret
->kind
= cdk_pointer
;
9010 ret
->declarator
= itarget
;
9011 ret
->u
.pointer_quals
= quals
;
9015 /* Return a pointer to a structure for an empty list of declaration
9018 struct c_declspecs
*
9019 build_null_declspecs (void)
9021 struct c_declspecs
*ret
= XOBNEW (&parser_obstack
, struct c_declspecs
);
9022 memset (&ret
->locations
, 0, cdw_number_of_elements
);
9027 ret
->align_log
= -1;
9028 ret
->typespec_word
= cts_none
;
9029 ret
->storage_class
= csc_none
;
9030 ret
->expr_const_operands
= true;
9031 ret
->declspecs_seen_p
= false;
9032 ret
->typespec_kind
= ctsk_none
;
9033 ret
->non_sc_seen_p
= false;
9034 ret
->typedef_p
= false;
9035 ret
->explicit_signed_p
= false;
9036 ret
->deprecated_p
= false;
9037 ret
->default_int_p
= false;
9038 ret
->long_p
= false;
9039 ret
->long_long_p
= false;
9040 ret
->short_p
= false;
9041 ret
->signed_p
= false;
9042 ret
->unsigned_p
= false;
9043 ret
->complex_p
= false;
9044 ret
->inline_p
= false;
9045 ret
->noreturn_p
= false;
9046 ret
->thread_p
= false;
9047 ret
->thread_gnu_p
= false;
9048 ret
->const_p
= false;
9049 ret
->volatile_p
= false;
9050 ret
->atomic_p
= false;
9051 ret
->restrict_p
= false;
9052 ret
->saturating_p
= false;
9053 ret
->alignas_p
= false;
9054 ret
->address_space
= ADDR_SPACE_GENERIC
;
9058 /* Add the address space ADDRSPACE to the declaration specifiers
9059 SPECS, returning SPECS. */
9061 struct c_declspecs
*
9062 declspecs_add_addrspace (source_location location
,
9063 struct c_declspecs
*specs
, addr_space_t as
)
9065 specs
->non_sc_seen_p
= true;
9066 specs
->declspecs_seen_p
= true;
9068 if (!ADDR_SPACE_GENERIC_P (specs
->address_space
)
9069 && specs
->address_space
!= as
)
9070 error ("incompatible address space qualifiers %qs and %qs",
9071 c_addr_space_name (as
),
9072 c_addr_space_name (specs
->address_space
));
9075 specs
->address_space
= as
;
9076 specs
->locations
[cdw_address_space
] = location
;
9081 /* Add the type qualifier QUAL to the declaration specifiers SPECS,
9084 struct c_declspecs
*
9085 declspecs_add_qual (source_location loc
,
9086 struct c_declspecs
*specs
, tree qual
)
9090 specs
->non_sc_seen_p
= true;
9091 specs
->declspecs_seen_p
= true;
9092 gcc_assert (TREE_CODE (qual
) == IDENTIFIER_NODE
9093 && C_IS_RESERVED_WORD (qual
));
9094 i
= C_RID_CODE (qual
);
9098 dupe
= specs
->const_p
;
9099 specs
->const_p
= true;
9100 specs
->locations
[cdw_const
] = loc
;
9103 dupe
= specs
->volatile_p
;
9104 specs
->volatile_p
= true;
9105 specs
->locations
[cdw_volatile
] = loc
;
9108 dupe
= specs
->restrict_p
;
9109 specs
->restrict_p
= true;
9110 specs
->locations
[cdw_restrict
] = loc
;
9113 dupe
= specs
->atomic_p
;
9114 specs
->atomic_p
= true;
9119 if (dupe
&& !flag_isoc99
)
9120 pedwarn (loc
, OPT_Wpedantic
, "duplicate %qE", qual
);
9124 /* Add the type specifier TYPE to the declaration specifiers SPECS,
9127 struct c_declspecs
*
9128 declspecs_add_type (location_t loc
, struct c_declspecs
*specs
,
9129 struct c_typespec spec
)
9131 tree type
= spec
.spec
;
9132 specs
->non_sc_seen_p
= true;
9133 specs
->declspecs_seen_p
= true;
9134 specs
->typespec_kind
= spec
.kind
;
9135 if (TREE_DEPRECATED (type
))
9136 specs
->deprecated_p
= true;
9138 /* Handle type specifier keywords. */
9139 if (TREE_CODE (type
) == IDENTIFIER_NODE
9140 && C_IS_RESERVED_WORD (type
)
9141 && C_RID_CODE (type
) != RID_CXX_COMPAT_WARN
)
9143 enum rid i
= C_RID_CODE (type
);
9146 error_at (loc
, "two or more data types in declaration specifiers");
9149 if ((int) i
<= (int) RID_LAST_MODIFIER
)
9151 /* "long", "short", "signed", "unsigned", "_Complex" or "_Sat". */
9156 if (specs
->long_long_p
)
9158 error_at (loc
, "%<long long long%> is too long for GCC");
9163 if (specs
->typespec_word
== cts_double
)
9166 ("both %<long long%> and %<double%> in "
9167 "declaration specifiers"));
9170 pedwarn_c90 (loc
, OPT_Wlong_long
,
9171 "ISO C90 does not support %<long long%>");
9172 specs
->long_long_p
= 1;
9173 specs
->locations
[cdw_long_long
] = loc
;
9178 ("both %<long%> and %<short%> in "
9179 "declaration specifiers"));
9180 else if (specs
->typespec_word
== cts_auto_type
)
9182 ("both %<long%> and %<__auto_type%> in "
9183 "declaration specifiers"));
9184 else if (specs
->typespec_word
== cts_void
)
9186 ("both %<long%> and %<void%> in "
9187 "declaration specifiers"));
9188 else if (specs
->typespec_word
== cts_int128
)
9190 ("both %<long%> and %<__int128%> in "
9191 "declaration specifiers"));
9192 else if (specs
->typespec_word
== cts_bool
)
9194 ("both %<long%> and %<_Bool%> in "
9195 "declaration specifiers"));
9196 else if (specs
->typespec_word
== cts_char
)
9198 ("both %<long%> and %<char%> in "
9199 "declaration specifiers"));
9200 else if (specs
->typespec_word
== cts_float
)
9202 ("both %<long%> and %<float%> in "
9203 "declaration specifiers"));
9204 else if (specs
->typespec_word
== cts_dfloat32
)
9206 ("both %<long%> and %<_Decimal32%> in "
9207 "declaration specifiers"));
9208 else if (specs
->typespec_word
== cts_dfloat64
)
9210 ("both %<long%> and %<_Decimal64%> in "
9211 "declaration specifiers"));
9212 else if (specs
->typespec_word
== cts_dfloat128
)
9214 ("both %<long%> and %<_Decimal128%> in "
9215 "declaration specifiers"));
9218 specs
->long_p
= true;
9219 specs
->locations
[cdw_long
] = loc
;
9223 dupe
= specs
->short_p
;
9226 ("both %<long%> and %<short%> in "
9227 "declaration specifiers"));
9228 else if (specs
->typespec_word
== cts_auto_type
)
9230 ("both %<short%> and %<__auto_type%> in "
9231 "declaration specifiers"));
9232 else if (specs
->typespec_word
== cts_void
)
9234 ("both %<short%> and %<void%> in "
9235 "declaration specifiers"));
9236 else if (specs
->typespec_word
== cts_int128
)
9238 ("both %<short%> and %<__int128%> in "
9239 "declaration specifiers"));
9240 else if (specs
->typespec_word
== cts_bool
)
9242 ("both %<short%> and %<_Bool%> in "
9243 "declaration specifiers"));
9244 else if (specs
->typespec_word
== cts_char
)
9246 ("both %<short%> and %<char%> in "
9247 "declaration specifiers"));
9248 else if (specs
->typespec_word
== cts_float
)
9250 ("both %<short%> and %<float%> in "
9251 "declaration specifiers"));
9252 else if (specs
->typespec_word
== cts_double
)
9254 ("both %<short%> and %<double%> in "
9255 "declaration specifiers"));
9256 else if (specs
->typespec_word
== cts_dfloat32
)
9258 ("both %<short%> and %<_Decimal32%> in "
9259 "declaration specifiers"));
9260 else if (specs
->typespec_word
== cts_dfloat64
)
9262 ("both %<short%> and %<_Decimal64%> in "
9263 "declaration specifiers"));
9264 else if (specs
->typespec_word
== cts_dfloat128
)
9266 ("both %<short%> and %<_Decimal128%> in "
9267 "declaration specifiers"));
9270 specs
->short_p
= true;
9271 specs
->locations
[cdw_short
] = loc
;
9275 dupe
= specs
->signed_p
;
9276 if (specs
->unsigned_p
)
9278 ("both %<signed%> and %<unsigned%> in "
9279 "declaration specifiers"));
9280 else if (specs
->typespec_word
== cts_auto_type
)
9282 ("both %<signed%> and %<__auto_type%> in "
9283 "declaration specifiers"));
9284 else if (specs
->typespec_word
== cts_void
)
9286 ("both %<signed%> and %<void%> in "
9287 "declaration specifiers"));
9288 else if (specs
->typespec_word
== cts_bool
)
9290 ("both %<signed%> and %<_Bool%> in "
9291 "declaration specifiers"));
9292 else if (specs
->typespec_word
== cts_float
)
9294 ("both %<signed%> and %<float%> in "
9295 "declaration specifiers"));
9296 else if (specs
->typespec_word
== cts_double
)
9298 ("both %<signed%> and %<double%> in "
9299 "declaration specifiers"));
9300 else if (specs
->typespec_word
== cts_dfloat32
)
9302 ("both %<signed%> and %<_Decimal32%> in "
9303 "declaration specifiers"));
9304 else if (specs
->typespec_word
== cts_dfloat64
)
9306 ("both %<signed%> and %<_Decimal64%> in "
9307 "declaration specifiers"));
9308 else if (specs
->typespec_word
== cts_dfloat128
)
9310 ("both %<signed%> and %<_Decimal128%> in "
9311 "declaration specifiers"));
9314 specs
->signed_p
= true;
9315 specs
->locations
[cdw_signed
] = loc
;
9319 dupe
= specs
->unsigned_p
;
9320 if (specs
->signed_p
)
9322 ("both %<signed%> and %<unsigned%> in "
9323 "declaration specifiers"));
9324 else if (specs
->typespec_word
== cts_auto_type
)
9326 ("both %<unsigned%> and %<__auto_type%> in "
9327 "declaration specifiers"));
9328 else if (specs
->typespec_word
== cts_void
)
9330 ("both %<unsigned%> and %<void%> in "
9331 "declaration specifiers"));
9332 else if (specs
->typespec_word
== cts_bool
)
9334 ("both %<unsigned%> and %<_Bool%> in "
9335 "declaration specifiers"));
9336 else if (specs
->typespec_word
== cts_float
)
9338 ("both %<unsigned%> and %<float%> in "
9339 "declaration specifiers"));
9340 else if (specs
->typespec_word
== cts_double
)
9342 ("both %<unsigned%> and %<double%> in "
9343 "declaration specifiers"));
9344 else if (specs
->typespec_word
== cts_dfloat32
)
9346 ("both %<unsigned%> and %<_Decimal32%> in "
9347 "declaration specifiers"));
9348 else if (specs
->typespec_word
== cts_dfloat64
)
9350 ("both %<unsigned%> and %<_Decimal64%> in "
9351 "declaration specifiers"));
9352 else if (specs
->typespec_word
== cts_dfloat128
)
9354 ("both %<unsigned%> and %<_Decimal128%> in "
9355 "declaration specifiers"));
9358 specs
->unsigned_p
= true;
9359 specs
->locations
[cdw_unsigned
] = loc
;
9363 dupe
= specs
->complex_p
;
9364 if (!flag_isoc99
&& !in_system_header_at (loc
))
9365 pedwarn (loc
, OPT_Wpedantic
,
9366 "ISO C90 does not support complex types");
9367 if (specs
->typespec_word
== cts_auto_type
)
9369 ("both %<complex%> and %<__auto_type%> in "
9370 "declaration specifiers"));
9371 else if (specs
->typespec_word
== cts_void
)
9373 ("both %<complex%> and %<void%> in "
9374 "declaration specifiers"));
9375 else if (specs
->typespec_word
== cts_bool
)
9377 ("both %<complex%> and %<_Bool%> in "
9378 "declaration specifiers"));
9379 else if (specs
->typespec_word
== cts_dfloat32
)
9381 ("both %<complex%> and %<_Decimal32%> in "
9382 "declaration specifiers"));
9383 else if (specs
->typespec_word
== cts_dfloat64
)
9385 ("both %<complex%> and %<_Decimal64%> in "
9386 "declaration specifiers"));
9387 else if (specs
->typespec_word
== cts_dfloat128
)
9389 ("both %<complex%> and %<_Decimal128%> in "
9390 "declaration specifiers"));
9391 else if (specs
->typespec_word
== cts_fract
)
9393 ("both %<complex%> and %<_Fract%> in "
9394 "declaration specifiers"));
9395 else if (specs
->typespec_word
== cts_accum
)
9397 ("both %<complex%> and %<_Accum%> in "
9398 "declaration specifiers"));
9399 else if (specs
->saturating_p
)
9401 ("both %<complex%> and %<_Sat%> in "
9402 "declaration specifiers"));
9405 specs
->complex_p
= true;
9406 specs
->locations
[cdw_complex
] = loc
;
9410 dupe
= specs
->saturating_p
;
9411 pedwarn (loc
, OPT_Wpedantic
,
9412 "ISO C does not support saturating types");
9413 if (specs
->typespec_word
== cts_int128
)
9416 ("both %<_Sat%> and %<__int128%> in "
9417 "declaration specifiers"));
9419 else if (specs
->typespec_word
== cts_auto_type
)
9421 ("both %<_Sat%> and %<__auto_type%> in "
9422 "declaration specifiers"));
9423 else if (specs
->typespec_word
== cts_void
)
9425 ("both %<_Sat%> and %<void%> in "
9426 "declaration specifiers"));
9427 else if (specs
->typespec_word
== cts_bool
)
9429 ("both %<_Sat%> and %<_Bool%> in "
9430 "declaration specifiers"));
9431 else if (specs
->typespec_word
== cts_char
)
9433 ("both %<_Sat%> and %<char%> in "
9434 "declaration specifiers"));
9435 else if (specs
->typespec_word
== cts_int
)
9437 ("both %<_Sat%> and %<int%> in "
9438 "declaration specifiers"));
9439 else if (specs
->typespec_word
== cts_float
)
9441 ("both %<_Sat%> and %<float%> in "
9442 "declaration specifiers"));
9443 else if (specs
->typespec_word
== cts_double
)
9445 ("both %<_Sat%> and %<double%> in "
9446 "declaration specifiers"));
9447 else if (specs
->typespec_word
== cts_dfloat32
)
9449 ("both %<_Sat%> and %<_Decimal32%> in "
9450 "declaration specifiers"));
9451 else if (specs
->typespec_word
== cts_dfloat64
)
9453 ("both %<_Sat%> and %<_Decimal64%> in "
9454 "declaration specifiers"));
9455 else if (specs
->typespec_word
== cts_dfloat128
)
9457 ("both %<_Sat%> and %<_Decimal128%> in "
9458 "declaration specifiers"));
9459 else if (specs
->complex_p
)
9461 ("both %<_Sat%> and %<complex%> in "
9462 "declaration specifiers"));
9465 specs
->saturating_p
= true;
9466 specs
->locations
[cdw_saturating
] = loc
;
9474 error_at (loc
, "duplicate %qE", type
);
9480 /* "void", "_Bool", "char", "int", "float", "double", "_Decimal32",
9481 "__int128", "_Decimal64", "_Decimal128", "_Fract", "_Accum" or
9483 if (specs
->typespec_word
!= cts_none
)
9486 "two or more data types in declaration specifiers");
9494 ("both %<long%> and %<__auto_type%> in "
9495 "declaration specifiers"));
9496 else if (specs
->short_p
)
9498 ("both %<short%> and %<__auto_type%> in "
9499 "declaration specifiers"));
9500 else if (specs
->signed_p
)
9502 ("both %<signed%> and %<__auto_type%> in "
9503 "declaration specifiers"));
9504 else if (specs
->unsigned_p
)
9506 ("both %<unsigned%> and %<__auto_type%> in "
9507 "declaration specifiers"));
9508 else if (specs
->complex_p
)
9510 ("both %<complex%> and %<__auto_type%> in "
9511 "declaration specifiers"));
9512 else if (specs
->saturating_p
)
9514 ("both %<_Sat%> and %<__auto_type%> in "
9515 "declaration specifiers"));
9518 specs
->typespec_word
= cts_auto_type
;
9519 specs
->locations
[cdw_typespec
] = loc
;
9523 if (int128_integer_type_node
== NULL_TREE
)
9525 error_at (loc
, "%<__int128%> is not supported for this target");
9528 if (!in_system_header_at (input_location
))
9529 pedwarn (loc
, OPT_Wpedantic
,
9530 "ISO C does not support %<__int128%> type");
9534 ("both %<__int128%> and %<long%> in "
9535 "declaration specifiers"));
9536 else if (specs
->saturating_p
)
9538 ("both %<_Sat%> and %<__int128%> in "
9539 "declaration specifiers"));
9540 else if (specs
->short_p
)
9542 ("both %<__int128%> and %<short%> in "
9543 "declaration specifiers"));
9546 specs
->typespec_word
= cts_int128
;
9547 specs
->locations
[cdw_typespec
] = loc
;
9553 ("both %<long%> and %<void%> in "
9554 "declaration specifiers"));
9555 else if (specs
->short_p
)
9557 ("both %<short%> and %<void%> in "
9558 "declaration specifiers"));
9559 else if (specs
->signed_p
)
9561 ("both %<signed%> and %<void%> in "
9562 "declaration specifiers"));
9563 else if (specs
->unsigned_p
)
9565 ("both %<unsigned%> and %<void%> in "
9566 "declaration specifiers"));
9567 else if (specs
->complex_p
)
9569 ("both %<complex%> and %<void%> in "
9570 "declaration specifiers"));
9571 else if (specs
->saturating_p
)
9573 ("both %<_Sat%> and %<void%> in "
9574 "declaration specifiers"));
9577 specs
->typespec_word
= cts_void
;
9578 specs
->locations
[cdw_typespec
] = loc
;
9582 if (!flag_isoc99
&& !in_system_header_at (loc
))
9583 pedwarn (loc
, OPT_Wpedantic
,
9584 "ISO C90 does not support boolean types");
9587 ("both %<long%> and %<_Bool%> in "
9588 "declaration specifiers"));
9589 else if (specs
->short_p
)
9591 ("both %<short%> and %<_Bool%> in "
9592 "declaration specifiers"));
9593 else if (specs
->signed_p
)
9595 ("both %<signed%> and %<_Bool%> in "
9596 "declaration specifiers"));
9597 else if (specs
->unsigned_p
)
9599 ("both %<unsigned%> and %<_Bool%> in "
9600 "declaration specifiers"));
9601 else if (specs
->complex_p
)
9603 ("both %<complex%> and %<_Bool%> in "
9604 "declaration specifiers"));
9605 else if (specs
->saturating_p
)
9607 ("both %<_Sat%> and %<_Bool%> in "
9608 "declaration specifiers"));
9611 specs
->typespec_word
= cts_bool
;
9612 specs
->locations
[cdw_typespec
] = loc
;
9618 ("both %<long%> and %<char%> in "
9619 "declaration specifiers"));
9620 else if (specs
->short_p
)
9622 ("both %<short%> and %<char%> in "
9623 "declaration specifiers"));
9624 else if (specs
->saturating_p
)
9626 ("both %<_Sat%> and %<char%> in "
9627 "declaration specifiers"));
9630 specs
->typespec_word
= cts_char
;
9631 specs
->locations
[cdw_typespec
] = loc
;
9635 if (specs
->saturating_p
)
9637 ("both %<_Sat%> and %<int%> in "
9638 "declaration specifiers"));
9641 specs
->typespec_word
= cts_int
;
9642 specs
->locations
[cdw_typespec
] = loc
;
9648 ("both %<long%> and %<float%> in "
9649 "declaration specifiers"));
9650 else if (specs
->short_p
)
9652 ("both %<short%> and %<float%> in "
9653 "declaration specifiers"));
9654 else if (specs
->signed_p
)
9656 ("both %<signed%> and %<float%> in "
9657 "declaration specifiers"));
9658 else if (specs
->unsigned_p
)
9660 ("both %<unsigned%> and %<float%> in "
9661 "declaration specifiers"));
9662 else if (specs
->saturating_p
)
9664 ("both %<_Sat%> and %<float%> in "
9665 "declaration specifiers"));
9668 specs
->typespec_word
= cts_float
;
9669 specs
->locations
[cdw_typespec
] = loc
;
9673 if (specs
->long_long_p
)
9675 ("both %<long long%> and %<double%> in "
9676 "declaration specifiers"));
9677 else if (specs
->short_p
)
9679 ("both %<short%> and %<double%> in "
9680 "declaration specifiers"));
9681 else if (specs
->signed_p
)
9683 ("both %<signed%> and %<double%> in "
9684 "declaration specifiers"));
9685 else if (specs
->unsigned_p
)
9687 ("both %<unsigned%> and %<double%> in "
9688 "declaration specifiers"));
9689 else if (specs
->saturating_p
)
9691 ("both %<_Sat%> and %<double%> in "
9692 "declaration specifiers"));
9695 specs
->typespec_word
= cts_double
;
9696 specs
->locations
[cdw_typespec
] = loc
;
9704 if (i
== RID_DFLOAT32
)
9706 else if (i
== RID_DFLOAT64
)
9709 str
= "_Decimal128";
9710 if (specs
->long_long_p
)
9712 ("both %<long long%> and %<%s%> in "
9713 "declaration specifiers"),
9717 ("both %<long%> and %<%s%> in "
9718 "declaration specifiers"),
9720 else if (specs
->short_p
)
9722 ("both %<short%> and %<%s%> in "
9723 "declaration specifiers"),
9725 else if (specs
->signed_p
)
9727 ("both %<signed%> and %<%s%> in "
9728 "declaration specifiers"),
9730 else if (specs
->unsigned_p
)
9732 ("both %<unsigned%> and %<%s%> in "
9733 "declaration specifiers"),
9735 else if (specs
->complex_p
)
9737 ("both %<complex%> and %<%s%> in "
9738 "declaration specifiers"),
9740 else if (specs
->saturating_p
)
9742 ("both %<_Sat%> and %<%s%> in "
9743 "declaration specifiers"),
9745 else if (i
== RID_DFLOAT32
)
9746 specs
->typespec_word
= cts_dfloat32
;
9747 else if (i
== RID_DFLOAT64
)
9748 specs
->typespec_word
= cts_dfloat64
;
9750 specs
->typespec_word
= cts_dfloat128
;
9751 specs
->locations
[cdw_typespec
] = loc
;
9753 if (!targetm
.decimal_float_supported_p ())
9755 ("decimal floating point not supported "
9756 "for this target"));
9757 pedwarn (loc
, OPT_Wpedantic
,
9758 "ISO C does not support decimal floating point");
9768 if (specs
->complex_p
)
9770 ("both %<complex%> and %<%s%> in "
9771 "declaration specifiers"),
9773 else if (i
== RID_FRACT
)
9774 specs
->typespec_word
= cts_fract
;
9776 specs
->typespec_word
= cts_accum
;
9777 specs
->locations
[cdw_typespec
] = loc
;
9779 if (!targetm
.fixed_point_supported_p ())
9781 "fixed-point types not supported for this target");
9782 pedwarn (loc
, OPT_Wpedantic
,
9783 "ISO C does not support fixed-point types");
9786 /* ObjC reserved word "id", handled below. */
9792 /* Now we have a typedef (a TYPE_DECL node), an identifier (some
9793 form of ObjC type, cases such as "int" and "long" being handled
9794 above), a TYPE (struct, union, enum and typeof specifiers) or an
9795 ERROR_MARK. In none of these cases may there have previously
9796 been any type specifiers. */
9797 if (specs
->type
|| specs
->typespec_word
!= cts_none
9798 || specs
->long_p
|| specs
->short_p
|| specs
->signed_p
9799 || specs
->unsigned_p
|| specs
->complex_p
)
9800 error_at (loc
, "two or more data types in declaration specifiers");
9801 else if (TREE_CODE (type
) == TYPE_DECL
)
9803 if (TREE_TYPE (type
) == error_mark_node
)
9804 ; /* Allow the type to default to int to avoid cascading errors. */
9807 specs
->type
= TREE_TYPE (type
);
9808 specs
->decl_attr
= DECL_ATTRIBUTES (type
);
9809 specs
->typedef_p
= true;
9810 specs
->explicit_signed_p
= C_TYPEDEF_EXPLICITLY_SIGNED (type
);
9811 specs
->locations
[cdw_typedef
] = loc
;
9813 /* If this typedef name is defined in a struct, then a C++
9814 lookup would return a different value. */
9816 && I_SYMBOL_BINDING (DECL_NAME (type
))->in_struct
)
9817 warning_at (loc
, OPT_Wc___compat
,
9818 "C++ lookup of %qD would return a field, not a type",
9821 /* If we are parsing a struct, record that a struct field
9823 if (warn_cxx_compat
&& struct_parse_info
!= NULL
)
9824 struct_parse_info
->typedefs_seen
.safe_push (type
);
9827 else if (TREE_CODE (type
) == IDENTIFIER_NODE
)
9829 tree t
= lookup_name (type
);
9830 if (!t
|| TREE_CODE (t
) != TYPE_DECL
)
9831 error_at (loc
, "%qE fails to be a typedef or built in type", type
);
9832 else if (TREE_TYPE (t
) == error_mark_node
)
9836 specs
->type
= TREE_TYPE (t
);
9837 specs
->locations
[cdw_typespec
] = loc
;
9842 if (TREE_CODE (type
) != ERROR_MARK
&& spec
.kind
== ctsk_typeof
)
9844 specs
->typedef_p
= true;
9845 specs
->locations
[cdw_typedef
] = loc
;
9849 specs
->expr
= build2 (COMPOUND_EXPR
, TREE_TYPE (spec
.expr
),
9850 specs
->expr
, spec
.expr
);
9852 specs
->expr
= spec
.expr
;
9853 specs
->expr_const_operands
&= spec
.expr_const_operands
;
9862 /* Add the storage class specifier or function specifier SCSPEC to the
9863 declaration specifiers SPECS, returning SPECS. */
9865 struct c_declspecs
*
9866 declspecs_add_scspec (source_location loc
,
9867 struct c_declspecs
*specs
,
9871 enum c_storage_class n
= csc_none
;
9873 specs
->declspecs_seen_p
= true;
9874 gcc_assert (TREE_CODE (scspec
) == IDENTIFIER_NODE
9875 && C_IS_RESERVED_WORD (scspec
));
9876 i
= C_RID_CODE (scspec
);
9877 if (specs
->non_sc_seen_p
)
9878 warning (OPT_Wold_style_declaration
,
9879 "%qE is not at beginning of declaration", scspec
);
9883 /* C99 permits duplicate inline. Although of doubtful utility,
9884 it seems simplest to permit it in gnu89 mode as well, as
9885 there is also little utility in maintaining this as a
9886 difference between gnu89 and C99 inline. */
9888 specs
->inline_p
= true;
9889 specs
->locations
[cdw_inline
] = loc
;
9892 /* Duplicate _Noreturn is permitted. */
9894 specs
->noreturn_p
= true;
9895 specs
->locations
[cdw_noreturn
] = loc
;
9898 dupe
= specs
->thread_p
;
9899 if (specs
->storage_class
== csc_auto
)
9900 error ("%qE used with %<auto%>", scspec
);
9901 else if (specs
->storage_class
== csc_register
)
9902 error ("%qE used with %<register%>", scspec
);
9903 else if (specs
->storage_class
== csc_typedef
)
9904 error ("%qE used with %<typedef%>", scspec
);
9907 specs
->thread_p
= true;
9908 specs
->thread_gnu_p
= (strcmp (IDENTIFIER_POINTER (scspec
),
9910 /* A diagnostic is not required for the use of this
9911 identifier in the implementation namespace; only diagnose
9912 it for the C11 spelling because of existing code using
9913 the other spelling. */
9914 if (!flag_isoc11
&& !specs
->thread_gnu_p
)
9917 pedwarn (loc
, OPT_Wpedantic
,
9918 "ISO C99 does not support %qE", scspec
);
9920 pedwarn (loc
, OPT_Wpedantic
,
9921 "ISO C90 does not support %qE", scspec
);
9923 specs
->locations
[cdw_thread
] = loc
;
9931 /* Diagnose "__thread extern". */
9932 if (specs
->thread_p
&& specs
->thread_gnu_p
)
9933 error ("%<__thread%> before %<extern%>");
9940 /* Diagnose "__thread static". */
9941 if (specs
->thread_p
&& specs
->thread_gnu_p
)
9942 error ("%<__thread%> before %<static%>");
9950 if (n
!= csc_none
&& n
== specs
->storage_class
)
9954 if (i
== RID_THREAD
)
9955 error ("duplicate %<_Thread_local%> or %<__thread%>");
9957 error ("duplicate %qE", scspec
);
9961 if (specs
->storage_class
!= csc_none
&& n
!= specs
->storage_class
)
9963 error ("multiple storage classes in declaration specifiers");
9967 specs
->storage_class
= n
;
9968 specs
->locations
[cdw_storage_class
] = loc
;
9969 if (n
!= csc_extern
&& n
!= csc_static
&& specs
->thread_p
)
9971 error ("%qs used with %qE",
9972 specs
->thread_gnu_p
? "__thread" : "_Thread_local",
9974 specs
->thread_p
= false;
9981 /* Add the attributes ATTRS to the declaration specifiers SPECS,
9984 struct c_declspecs
*
9985 declspecs_add_attrs (source_location loc
, struct c_declspecs
*specs
, tree attrs
)
9987 specs
->attrs
= chainon (attrs
, specs
->attrs
);
9988 specs
->locations
[cdw_attributes
] = loc
;
9989 specs
->declspecs_seen_p
= true;
9993 /* Add an _Alignas specifier (expression ALIGN, or type whose
9994 alignment is ALIGN) to the declaration specifiers SPECS, returning
9996 struct c_declspecs
*
9997 declspecs_add_alignas (source_location loc
,
9998 struct c_declspecs
*specs
, tree align
)
10001 specs
->alignas_p
= true;
10002 specs
->locations
[cdw_alignas
] = loc
;
10003 if (align
== error_mark_node
)
10005 align_log
= check_user_alignment (align
, true);
10006 if (align_log
> specs
->align_log
)
10007 specs
->align_log
= align_log
;
10011 /* Combine "long", "short", "signed", "unsigned" and "_Complex" type
10012 specifiers with any other type specifier to determine the resulting
10013 type. This is where ISO C checks on complex types are made, since
10014 "_Complex long" is a prefix of the valid ISO C type "_Complex long
10017 struct c_declspecs
*
10018 finish_declspecs (struct c_declspecs
*specs
)
10020 /* If a type was specified as a whole, we have no modifiers and are
10022 if (specs
->type
!= NULL_TREE
)
10024 gcc_assert (!specs
->long_p
&& !specs
->long_long_p
&& !specs
->short_p
10025 && !specs
->signed_p
&& !specs
->unsigned_p
10026 && !specs
->complex_p
);
10028 /* Set a dummy type. */
10029 if (TREE_CODE (specs
->type
) == ERROR_MARK
)
10030 specs
->type
= integer_type_node
;
10034 /* If none of "void", "_Bool", "char", "int", "float" or "double"
10035 has been specified, treat it as "int" unless "_Complex" is
10036 present and there are no other specifiers. If we just have
10037 "_Complex", it is equivalent to "_Complex double", but e.g.
10038 "_Complex short" is equivalent to "_Complex short int". */
10039 if (specs
->typespec_word
== cts_none
)
10041 if (specs
->saturating_p
)
10043 error_at (specs
->locations
[cdw_saturating
],
10044 "%<_Sat%> is used without %<_Fract%> or %<_Accum%>");
10045 if (!targetm
.fixed_point_supported_p ())
10046 error_at (specs
->locations
[cdw_saturating
],
10047 "fixed-point types not supported for this target");
10048 specs
->typespec_word
= cts_fract
;
10050 else if (specs
->long_p
|| specs
->short_p
10051 || specs
->signed_p
|| specs
->unsigned_p
)
10053 specs
->typespec_word
= cts_int
;
10055 else if (specs
->complex_p
)
10057 specs
->typespec_word
= cts_double
;
10058 pedwarn (specs
->locations
[cdw_complex
], OPT_Wpedantic
,
10059 "ISO C does not support plain %<complex%> meaning "
10060 "%<double complex%>");
10064 specs
->typespec_word
= cts_int
;
10065 specs
->default_int_p
= true;
10066 /* We don't diagnose this here because grokdeclarator will
10067 give more specific diagnostics according to whether it is
10068 a function definition. */
10072 /* If "signed" was specified, record this to distinguish "int" and
10073 "signed int" in the case of a bit-field with
10074 -funsigned-bitfields. */
10075 specs
->explicit_signed_p
= specs
->signed_p
;
10077 /* Now compute the actual type. */
10078 switch (specs
->typespec_word
)
10080 case cts_auto_type
:
10081 gcc_assert (!specs
->long_p
&& !specs
->short_p
10082 && !specs
->signed_p
&& !specs
->unsigned_p
10083 && !specs
->complex_p
);
10084 /* Type to be filled in later. */
10087 gcc_assert (!specs
->long_p
&& !specs
->short_p
10088 && !specs
->signed_p
&& !specs
->unsigned_p
10089 && !specs
->complex_p
);
10090 specs
->type
= void_type_node
;
10093 gcc_assert (!specs
->long_p
&& !specs
->short_p
10094 && !specs
->signed_p
&& !specs
->unsigned_p
10095 && !specs
->complex_p
);
10096 specs
->type
= boolean_type_node
;
10099 gcc_assert (!specs
->long_p
&& !specs
->short_p
);
10100 gcc_assert (!(specs
->signed_p
&& specs
->unsigned_p
));
10101 if (specs
->signed_p
)
10102 specs
->type
= signed_char_type_node
;
10103 else if (specs
->unsigned_p
)
10104 specs
->type
= unsigned_char_type_node
;
10106 specs
->type
= char_type_node
;
10107 if (specs
->complex_p
)
10109 pedwarn (specs
->locations
[cdw_complex
], OPT_Wpedantic
,
10110 "ISO C does not support complex integer types");
10111 specs
->type
= build_complex_type (specs
->type
);
10115 gcc_assert (!specs
->long_p
&& !specs
->short_p
&& !specs
->long_long_p
);
10116 gcc_assert (!(specs
->signed_p
&& specs
->unsigned_p
));
10117 specs
->type
= (specs
->unsigned_p
10118 ? int128_unsigned_type_node
10119 : int128_integer_type_node
);
10120 if (specs
->complex_p
)
10122 pedwarn (specs
->locations
[cdw_complex
], OPT_Wpedantic
,
10123 "ISO C does not support complex integer types");
10124 specs
->type
= build_complex_type (specs
->type
);
10128 gcc_assert (!(specs
->long_p
&& specs
->short_p
));
10129 gcc_assert (!(specs
->signed_p
&& specs
->unsigned_p
));
10130 if (specs
->long_long_p
)
10131 specs
->type
= (specs
->unsigned_p
10132 ? long_long_unsigned_type_node
10133 : long_long_integer_type_node
);
10134 else if (specs
->long_p
)
10135 specs
->type
= (specs
->unsigned_p
10136 ? long_unsigned_type_node
10137 : long_integer_type_node
);
10138 else if (specs
->short_p
)
10139 specs
->type
= (specs
->unsigned_p
10140 ? short_unsigned_type_node
10141 : short_integer_type_node
);
10143 specs
->type
= (specs
->unsigned_p
10144 ? unsigned_type_node
10145 : integer_type_node
);
10146 if (specs
->complex_p
)
10148 pedwarn (specs
->locations
[cdw_complex
], OPT_Wpedantic
,
10149 "ISO C does not support complex integer types");
10150 specs
->type
= build_complex_type (specs
->type
);
10154 gcc_assert (!specs
->long_p
&& !specs
->short_p
10155 && !specs
->signed_p
&& !specs
->unsigned_p
);
10156 specs
->type
= (specs
->complex_p
10157 ? complex_float_type_node
10158 : float_type_node
);
10161 gcc_assert (!specs
->long_long_p
&& !specs
->short_p
10162 && !specs
->signed_p
&& !specs
->unsigned_p
);
10165 specs
->type
= (specs
->complex_p
10166 ? complex_long_double_type_node
10167 : long_double_type_node
);
10171 specs
->type
= (specs
->complex_p
10172 ? complex_double_type_node
10173 : double_type_node
);
10178 case cts_dfloat128
:
10179 gcc_assert (!specs
->long_p
&& !specs
->long_long_p
&& !specs
->short_p
10180 && !specs
->signed_p
&& !specs
->unsigned_p
&& !specs
->complex_p
);
10181 if (specs
->typespec_word
== cts_dfloat32
)
10182 specs
->type
= dfloat32_type_node
;
10183 else if (specs
->typespec_word
== cts_dfloat64
)
10184 specs
->type
= dfloat64_type_node
;
10186 specs
->type
= dfloat128_type_node
;
10189 gcc_assert (!specs
->complex_p
);
10190 if (!targetm
.fixed_point_supported_p ())
10191 specs
->type
= integer_type_node
;
10192 else if (specs
->saturating_p
)
10194 if (specs
->long_long_p
)
10195 specs
->type
= specs
->unsigned_p
10196 ? sat_unsigned_long_long_fract_type_node
10197 : sat_long_long_fract_type_node
;
10198 else if (specs
->long_p
)
10199 specs
->type
= specs
->unsigned_p
10200 ? sat_unsigned_long_fract_type_node
10201 : sat_long_fract_type_node
;
10202 else if (specs
->short_p
)
10203 specs
->type
= specs
->unsigned_p
10204 ? sat_unsigned_short_fract_type_node
10205 : sat_short_fract_type_node
;
10207 specs
->type
= specs
->unsigned_p
10208 ? sat_unsigned_fract_type_node
10209 : sat_fract_type_node
;
10213 if (specs
->long_long_p
)
10214 specs
->type
= specs
->unsigned_p
10215 ? unsigned_long_long_fract_type_node
10216 : long_long_fract_type_node
;
10217 else if (specs
->long_p
)
10218 specs
->type
= specs
->unsigned_p
10219 ? unsigned_long_fract_type_node
10220 : long_fract_type_node
;
10221 else if (specs
->short_p
)
10222 specs
->type
= specs
->unsigned_p
10223 ? unsigned_short_fract_type_node
10224 : short_fract_type_node
;
10226 specs
->type
= specs
->unsigned_p
10227 ? unsigned_fract_type_node
10232 gcc_assert (!specs
->complex_p
);
10233 if (!targetm
.fixed_point_supported_p ())
10234 specs
->type
= integer_type_node
;
10235 else if (specs
->saturating_p
)
10237 if (specs
->long_long_p
)
10238 specs
->type
= specs
->unsigned_p
10239 ? sat_unsigned_long_long_accum_type_node
10240 : sat_long_long_accum_type_node
;
10241 else if (specs
->long_p
)
10242 specs
->type
= specs
->unsigned_p
10243 ? sat_unsigned_long_accum_type_node
10244 : sat_long_accum_type_node
;
10245 else if (specs
->short_p
)
10246 specs
->type
= specs
->unsigned_p
10247 ? sat_unsigned_short_accum_type_node
10248 : sat_short_accum_type_node
;
10250 specs
->type
= specs
->unsigned_p
10251 ? sat_unsigned_accum_type_node
10252 : sat_accum_type_node
;
10256 if (specs
->long_long_p
)
10257 specs
->type
= specs
->unsigned_p
10258 ? unsigned_long_long_accum_type_node
10259 : long_long_accum_type_node
;
10260 else if (specs
->long_p
)
10261 specs
->type
= specs
->unsigned_p
10262 ? unsigned_long_accum_type_node
10263 : long_accum_type_node
;
10264 else if (specs
->short_p
)
10265 specs
->type
= specs
->unsigned_p
10266 ? unsigned_short_accum_type_node
10267 : short_accum_type_node
;
10269 specs
->type
= specs
->unsigned_p
10270 ? unsigned_accum_type_node
10275 gcc_unreachable ();
10281 /* A subroutine of c_write_global_declarations. Perform final processing
10282 on one file scope's declarations (or the external scope's declarations),
10286 c_write_global_declarations_1 (tree globals
)
10291 /* Process the decls in the order they were written. */
10292 for (decl
= globals
; decl
; decl
= DECL_CHAIN (decl
))
10294 /* Check for used but undefined static functions using the C
10295 standard's definition of "used", and set TREE_NO_WARNING so
10296 that check_global_declarations doesn't repeat the check. */
10297 if (TREE_CODE (decl
) == FUNCTION_DECL
10298 && DECL_INITIAL (decl
) == 0
10299 && DECL_EXTERNAL (decl
)
10300 && !TREE_PUBLIC (decl
)
10301 && C_DECL_USED (decl
))
10303 pedwarn (input_location
, 0, "%q+F used but never defined", decl
);
10304 TREE_NO_WARNING (decl
) = 1;
10307 wrapup_global_declaration_1 (decl
);
10312 reconsider
= false;
10313 for (decl
= globals
; decl
; decl
= DECL_CHAIN (decl
))
10314 reconsider
|= wrapup_global_declaration_2 (decl
);
10316 while (reconsider
);
10318 for (decl
= globals
; decl
; decl
= DECL_CHAIN (decl
))
10319 check_global_declaration_1 (decl
);
10322 /* A subroutine of c_write_global_declarations Emit debug information for each
10323 of the declarations in GLOBALS. */
10326 c_write_global_declarations_2 (tree globals
)
10330 for (decl
= globals
; decl
; decl
= DECL_CHAIN (decl
))
10331 debug_hooks
->global_decl (decl
);
10334 /* Callback to collect a source_ref from a DECL. */
10337 collect_source_ref_cb (tree decl
)
10339 if (!DECL_IS_BUILTIN (decl
))
10340 collect_source_ref (LOCATION_FILE (decl_sloc (decl
, false)));
10343 /* Preserve the external declarations scope across a garbage collect. */
10344 static GTY(()) tree ext_block
;
10346 /* Collect all references relevant to SOURCE_FILE. */
10349 collect_all_refs (const char *source_file
)
10354 FOR_EACH_VEC_ELT (*all_translation_units
, i
, t
)
10355 collect_ada_nodes (BLOCK_VARS (DECL_INITIAL (t
)), source_file
);
10357 collect_ada_nodes (BLOCK_VARS (ext_block
), source_file
);
10360 /* Iterate over all global declarations and call CALLBACK. */
10363 for_each_global_decl (void (*callback
) (tree decl
))
10370 FOR_EACH_VEC_ELT (*all_translation_units
, i
, t
)
10372 decls
= DECL_INITIAL (t
);
10373 for (decl
= BLOCK_VARS (decls
); decl
; decl
= TREE_CHAIN (decl
))
10377 for (decl
= BLOCK_VARS (ext_block
); decl
; decl
= TREE_CHAIN (decl
))
10382 c_write_global_declarations (void)
10387 /* We don't want to do this if generating a PCH. */
10391 timevar_start (TV_PHASE_DEFERRED
);
10393 /* Do the Objective-C stuff. This is where all the Objective-C
10394 module stuff gets generated (symtab, class/protocol/selector
10396 if (c_dialect_objc ())
10397 objc_write_global_declarations ();
10399 /* Close the external scope. */
10400 ext_block
= pop_scope ();
10401 external_scope
= 0;
10402 gcc_assert (!current_scope
);
10404 /* Handle -fdump-ada-spec[-slim]. */
10405 if (flag_dump_ada_spec
|| flag_dump_ada_spec_slim
)
10407 /* Build a table of files to generate specs for */
10408 if (flag_dump_ada_spec_slim
)
10409 collect_source_ref (main_input_filename
);
10411 for_each_global_decl (collect_source_ref_cb
);
10413 dump_ada_specs (collect_all_refs
, NULL
);
10418 tree tmp
= BLOCK_VARS (ext_block
);
10420 FILE * stream
= dump_begin (TDI_tu
, &flags
);
10423 dump_node (tmp
, flags
& ~TDF_SLIM
, stream
);
10424 dump_end (TDI_tu
, stream
);
10428 /* Process all file scopes in this compilation, and the external_scope,
10429 through wrapup_global_declarations and check_global_declarations. */
10430 FOR_EACH_VEC_ELT (*all_translation_units
, i
, t
)
10431 c_write_global_declarations_1 (BLOCK_VARS (DECL_INITIAL (t
)));
10432 c_write_global_declarations_1 (BLOCK_VARS (ext_block
));
10434 timevar_stop (TV_PHASE_DEFERRED
);
10435 timevar_start (TV_PHASE_OPT_GEN
);
10437 /* We're done parsing; proceed to optimize and emit assembly.
10438 FIXME: shouldn't be the front end's responsibility to call this. */
10439 finalize_compilation_unit ();
10441 timevar_stop (TV_PHASE_OPT_GEN
);
10442 timevar_start (TV_PHASE_DBGINFO
);
10444 /* After cgraph has had a chance to emit everything that's going to
10445 be emitted, output debug information for globals. */
10446 if (!seen_error ())
10448 timevar_push (TV_SYMOUT
);
10449 FOR_EACH_VEC_ELT (*all_translation_units
, i
, t
)
10450 c_write_global_declarations_2 (BLOCK_VARS (DECL_INITIAL (t
)));
10451 c_write_global_declarations_2 (BLOCK_VARS (ext_block
));
10452 timevar_pop (TV_SYMOUT
);
10456 timevar_stop (TV_PHASE_DBGINFO
);
10459 /* Register reserved keyword WORD as qualifier for address space AS. */
10462 c_register_addr_space (const char *word
, addr_space_t as
)
10464 int rid
= RID_FIRST_ADDR_SPACE
+ as
;
10467 /* Address space qualifiers are only supported
10468 in C with GNU extensions enabled. */
10469 if (c_dialect_objc () || flag_no_asm
)
10472 id
= get_identifier (word
);
10473 C_SET_RID_CODE (id
, rid
);
10474 C_IS_RESERVED_WORD (id
) = 1;
10475 ridpointers
[rid
] = id
;
10478 /* Return identifier to look up for omp declare reduction. */
10481 c_omp_reduction_id (enum tree_code reduction_code
, tree reduction_id
)
10483 const char *p
= NULL
;
10484 switch (reduction_code
)
10486 case PLUS_EXPR
: p
= "+"; break;
10487 case MULT_EXPR
: p
= "*"; break;
10488 case MINUS_EXPR
: p
= "-"; break;
10489 case BIT_AND_EXPR
: p
= "&"; break;
10490 case BIT_XOR_EXPR
: p
= "^"; break;
10491 case BIT_IOR_EXPR
: p
= "|"; break;
10492 case TRUTH_ANDIF_EXPR
: p
= "&&"; break;
10493 case TRUTH_ORIF_EXPR
: p
= "||"; break;
10494 case MIN_EXPR
: p
= "min"; break;
10495 case MAX_EXPR
: p
= "max"; break;
10502 if (TREE_CODE (reduction_id
) != IDENTIFIER_NODE
)
10503 return error_mark_node
;
10504 p
= IDENTIFIER_POINTER (reduction_id
);
10507 const char prefix
[] = "omp declare reduction ";
10508 size_t lenp
= sizeof (prefix
);
10509 size_t len
= strlen (p
);
10510 char *name
= XALLOCAVEC (char, lenp
+ len
);
10511 memcpy (name
, prefix
, lenp
- 1);
10512 memcpy (name
+ lenp
- 1, p
, len
+ 1);
10513 return get_identifier (name
);
10516 /* Lookup REDUCTION_ID in the current scope, or create an artificial
10517 VAR_DECL, bind it into the current scope and return it. */
10520 c_omp_reduction_decl (tree reduction_id
)
10522 struct c_binding
*b
= I_SYMBOL_BINDING (reduction_id
);
10523 if (b
!= NULL
&& B_IN_CURRENT_SCOPE (b
))
10526 tree decl
= build_decl (BUILTINS_LOCATION
, VAR_DECL
,
10527 reduction_id
, integer_type_node
);
10528 DECL_ARTIFICIAL (decl
) = 1;
10529 DECL_EXTERNAL (decl
) = 1;
10530 TREE_STATIC (decl
) = 1;
10531 TREE_PUBLIC (decl
) = 0;
10532 bind (reduction_id
, decl
, current_scope
, true, false, BUILTINS_LOCATION
);
10536 /* Lookup REDUCTION_ID in the first scope where it has entry for TYPE. */
10539 c_omp_reduction_lookup (tree reduction_id
, tree type
)
10541 struct c_binding
*b
= I_SYMBOL_BINDING (reduction_id
);
10545 for (t
= DECL_INITIAL (b
->decl
); t
; t
= TREE_CHAIN (t
))
10546 if (comptypes (TREE_PURPOSE (t
), type
))
10547 return TREE_VALUE (t
);
10550 return error_mark_node
;
10553 /* Helper function called via walk_tree, to diagnose invalid
10554 #pragma omp declare reduction combiners or initializers. */
10557 c_check_omp_declare_reduction_r (tree
*tp
, int *, void *data
)
10559 tree
*vars
= (tree
*) data
;
10560 if (SSA_VAR_P (*tp
)
10561 && !DECL_ARTIFICIAL (*tp
)
10565 location_t loc
= DECL_SOURCE_LOCATION (vars
[0]);
10566 if (strcmp (IDENTIFIER_POINTER (DECL_NAME (vars
[0])), "omp_out") == 0)
10567 error_at (loc
, "%<#pragma omp declare reduction%> combiner refers to "
10568 "variable %qD which is not %<omp_out%> nor %<omp_in%>",
10571 error_at (loc
, "%<#pragma omp declare reduction%> initializer refers "
10572 "to variable %qD which is not %<omp_priv%> nor "
10580 #include "gt-c-c-decl.h"