1 /* Process declarations and variables for C compiler.
2 Copyright (C) 1988-2022 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. */
28 #define INCLUDE_STRING
29 #define INCLUDE_MEMORY
31 #include "coretypes.h"
36 #include "stringpool.h"
39 #include "print-tree.h"
40 #include "stor-layout.h"
45 #include "c-family/c-objc.h"
46 #include "c-family/c-pragma.h"
47 #include "c-family/c-ubsan.h"
49 #include "langhooks.h"
50 #include "tree-iterator.h"
53 #include "c-family/c-ada-spec.h"
55 #include "spellcheck-tree.h"
56 #include "gcc-rich-location.h"
58 #include "c-family/name-hint.h"
59 #include "c-family/known-headers.h"
60 #include "c-family/c-spellcheck.h"
61 #include "context.h" /* For 'g'. */
62 #include "omp-general.h"
63 #include "omp-offload.h" /* For offload_vars. */
65 #include "tree-pretty-print.h"
67 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
69 { NORMAL
, /* Ordinary declaration */
70 FUNCDEF
, /* Function definition */
71 PARM
, /* Declaration of parm before function body */
72 FIELD
, /* Declaration inside struct or union */
73 TYPENAME
}; /* Typename (inside cast or sizeof) */
75 /* States indicating how grokdeclarator() should handle declspecs marked
76 with __attribute__((deprecated)) or __attribute__((unavailable)).
77 An object declared as __attribute__((unavailable)) should suppress
78 any reports of being declared with unavailable or deprecated items.
79 An object declared as __attribute__((deprecated)) should suppress
80 warnings of uses of other deprecated items. */
82 enum deprecated_states
{
85 UNAVAILABLE_DEPRECATED_SUPPRESS
89 /* Nonzero if we have seen an invalid cross reference
90 to a struct, union, or enum, but not yet printed the message. */
91 tree pending_invalid_xref
;
93 /* File and line to appear in the eventual error message. */
94 location_t pending_invalid_xref_location
;
96 /* The file and line that the prototype came from if this is an
97 old-style definition; used for diagnostics in
98 store_parm_decls_oldstyle. */
100 static location_t current_function_prototype_locus
;
102 /* Whether this prototype was built-in. */
104 static bool current_function_prototype_built_in
;
106 /* The argument type information of this prototype. */
108 static tree current_function_prototype_arg_types
;
110 /* The argument information structure for the function currently being
113 static struct c_arg_info
*current_function_arg_info
;
115 /* The obstack on which parser and related data structures, which are
116 not live beyond their top-level declaration or definition, are
118 struct obstack parser_obstack
;
120 /* The current statement tree. */
122 static GTY(()) struct stmt_tree_s c_stmt_tree
;
124 /* Zero if we are not in an iteration or switch statement, otherwise
125 a bitmask. See bitmask definitions in c-tree.h. */
126 unsigned char in_statement
;
128 /* A list of decls to be made automatically visible in each file scope. */
129 static GTY(()) tree visible_builtins
;
131 /* Set to 0 at beginning of a function definition, set to 1 if
132 a return statement that specifies a return value is seen. */
134 int current_function_returns_value
;
136 /* Set to 0 at beginning of a function definition, set to 1 if
137 a return statement with no argument is seen. */
139 int current_function_returns_null
;
141 /* Set to 0 at beginning of a function definition, set to 1 if
142 a call to a noreturn function is seen. */
144 int current_function_returns_abnormally
;
146 /* Set to nonzero by `grokdeclarator' for a function
147 whose return type is defaulted, if warnings for this are desired. */
149 static int warn_about_return_type
;
151 /* Nonzero when the current toplevel function contains a declaration
152 of a nested function which is never defined. */
154 static bool undef_nested_function
;
156 /* If non-zero, implicit "omp declare target" attribute is added into the
158 int current_omp_declare_target_attribute
;
160 /* Each c_binding structure describes one binding of an identifier to
161 a decl. All the decls in a scope - irrespective of namespace - are
162 chained together by the ->prev field, which (as the name implies)
163 runs in reverse order. All the decls in a given namespace bound to
164 a given identifier are chained by the ->shadowed field, which runs
165 from inner to outer scopes.
167 The ->decl field usually points to a DECL node, but there are two
168 exceptions. In the namespace of type tags, the bound entity is a
169 RECORD_TYPE, UNION_TYPE, or ENUMERAL_TYPE node. If an undeclared
170 identifier is encountered, it is bound to error_mark_node to
171 suppress further errors about that identifier in the current
174 The ->u.type field stores the type of the declaration in this scope;
175 if NULL, the type is the type of the ->decl field. This is only of
176 relevance for objects with external or internal linkage which may
177 be redeclared in inner scopes, forming composite types that only
178 persist for the duration of those scopes. In the external scope,
179 this stores the composite of all the types declared for this
180 object, visible or not. The ->inner_comp field (used only at file
181 scope) stores whether an incomplete array type at file scope was
182 completed at an inner scope to an array size other than 1.
184 The ->u.label field is used for labels. It points to a structure
185 which stores additional information used for warnings.
187 The depth field is copied from the scope structure that holds this
188 decl. It is used to preserve the proper ordering of the ->shadowed
189 field (see bind()) and also for a handful of special-case checks.
190 Finally, the invisible bit is true for a decl which should be
191 ignored for purposes of normal name lookup, and the nested bit is
192 true for a decl that's been bound a second time in an inner scope;
193 in all such cases, the binding in the outer scope will have its
194 invisible bit true. */
196 struct GTY((chain_next ("%h.prev"))) c_binding
{
197 union GTY(()) { /* first so GTY desc can use decl */
198 tree
GTY((tag ("0"))) type
; /* the type in this scope */
199 struct c_label_vars
* GTY((tag ("1"))) label
; /* for warnings */
200 } GTY((desc ("TREE_CODE (%0.decl) == LABEL_DECL"))) u
;
201 tree decl
; /* the decl bound */
202 tree id
; /* the identifier it's bound to */
203 struct c_binding
*prev
; /* the previous decl in this scope */
204 struct c_binding
*shadowed
; /* the innermost decl shadowed by this one */
205 unsigned int depth
: 28; /* depth of this scope */
206 BOOL_BITFIELD invisible
: 1; /* normal lookup should ignore this binding */
207 BOOL_BITFIELD nested
: 1; /* do not set DECL_CONTEXT when popping */
208 BOOL_BITFIELD inner_comp
: 1; /* incomplete array completed in inner scope */
209 BOOL_BITFIELD in_struct
: 1; /* currently defined as struct field */
210 location_t locus
; /* location for nested bindings */
212 #define B_IN_SCOPE(b1, b2) ((b1)->depth == (b2)->depth)
213 #define B_IN_CURRENT_SCOPE(b) ((b)->depth == current_scope->depth)
214 #define B_IN_FILE_SCOPE(b) ((b)->depth == 1 /*file_scope->depth*/)
215 #define B_IN_EXTERNAL_SCOPE(b) ((b)->depth == 0 /*external_scope->depth*/)
217 /* Each C symbol points to three linked lists of c_binding structures.
218 These describe the values of the identifier in the three different
219 namespaces defined by the language. */
221 struct GTY(()) lang_identifier
{
222 struct c_common_identifier common_id
;
223 struct c_binding
*symbol_binding
; /* vars, funcs, constants, typedefs */
224 struct c_binding
*tag_binding
; /* struct/union/enum tags */
225 struct c_binding
*label_binding
; /* labels */
228 /* Validate c-lang.cc's assumptions. */
229 extern char C_SIZEOF_STRUCT_LANG_IDENTIFIER_isnt_accurate
230 [(sizeof(struct lang_identifier
) == C_SIZEOF_STRUCT_LANG_IDENTIFIER
) ? 1 : -1];
232 /* The binding oracle; see c-tree.h. */
233 void (*c_binding_oracle
) (enum c_oracle_request
, tree identifier
);
235 /* This flag is set on an identifier if we have previously asked the
236 binding oracle for this identifier's symbol binding. */
237 #define I_SYMBOL_CHECKED(node) \
238 (TREE_LANG_FLAG_4 (IDENTIFIER_NODE_CHECK (node)))
240 static inline struct c_binding
* *
241 i_symbol_binding (tree node
)
243 struct lang_identifier
*lid
244 = (struct lang_identifier
*) IDENTIFIER_NODE_CHECK (node
);
246 if (lid
->symbol_binding
== NULL
247 && c_binding_oracle
!= NULL
248 && !I_SYMBOL_CHECKED (node
))
250 /* Set the "checked" flag first, to avoid infinite recursion
251 when the binding oracle calls back into gcc. */
252 I_SYMBOL_CHECKED (node
) = 1;
253 c_binding_oracle (C_ORACLE_SYMBOL
, node
);
256 return &lid
->symbol_binding
;
259 #define I_SYMBOL_BINDING(node) (*i_symbol_binding (node))
261 #define I_SYMBOL_DECL(node) \
262 (I_SYMBOL_BINDING(node) ? I_SYMBOL_BINDING(node)->decl : 0)
264 /* This flag is set on an identifier if we have previously asked the
265 binding oracle for this identifier's tag binding. */
266 #define I_TAG_CHECKED(node) \
267 (TREE_LANG_FLAG_5 (IDENTIFIER_NODE_CHECK (node)))
269 static inline struct c_binding
**
270 i_tag_binding (tree node
)
272 struct lang_identifier
*lid
273 = (struct lang_identifier
*) IDENTIFIER_NODE_CHECK (node
);
275 if (lid
->tag_binding
== NULL
276 && c_binding_oracle
!= NULL
277 && !I_TAG_CHECKED (node
))
279 /* Set the "checked" flag first, to avoid infinite recursion
280 when the binding oracle calls back into gcc. */
281 I_TAG_CHECKED (node
) = 1;
282 c_binding_oracle (C_ORACLE_TAG
, node
);
285 return &lid
->tag_binding
;
288 #define I_TAG_BINDING(node) (*i_tag_binding (node))
290 #define I_TAG_DECL(node) \
291 (I_TAG_BINDING(node) ? I_TAG_BINDING(node)->decl : 0)
293 /* This flag is set on an identifier if we have previously asked the
294 binding oracle for this identifier's label binding. */
295 #define I_LABEL_CHECKED(node) \
296 (TREE_LANG_FLAG_6 (IDENTIFIER_NODE_CHECK (node)))
298 static inline struct c_binding
**
299 i_label_binding (tree node
)
301 struct lang_identifier
*lid
302 = (struct lang_identifier
*) IDENTIFIER_NODE_CHECK (node
);
304 if (lid
->label_binding
== NULL
305 && c_binding_oracle
!= NULL
306 && !I_LABEL_CHECKED (node
))
308 /* Set the "checked" flag first, to avoid infinite recursion
309 when the binding oracle calls back into gcc. */
310 I_LABEL_CHECKED (node
) = 1;
311 c_binding_oracle (C_ORACLE_LABEL
, node
);
314 return &lid
->label_binding
;
317 #define I_LABEL_BINDING(node) (*i_label_binding (node))
319 #define I_LABEL_DECL(node) \
320 (I_LABEL_BINDING(node) ? I_LABEL_BINDING(node)->decl : 0)
322 /* The resulting tree type. */
324 union GTY((desc ("TREE_CODE (&%h.generic) == IDENTIFIER_NODE"),
325 chain_next ("(union lang_tree_node *) c_tree_chain_next (&%h.generic)"))) lang_tree_node
327 union tree_node
GTY ((tag ("0"),
328 desc ("tree_node_structure (&%h)")))
330 struct lang_identifier
GTY ((tag ("1"))) identifier
;
333 /* Track bindings and other things that matter for goto warnings. For
334 efficiency, we do not gather all the decls at the point of
335 definition. Instead, we point into the bindings structure. As
336 scopes are popped, we update these structures and gather the decls
337 that matter at that time. */
339 struct GTY(()) c_spot_bindings
{
340 /* The currently open scope which holds bindings defined when the
341 label was defined or the goto statement was found. */
342 struct c_scope
*scope
;
343 /* The bindings in the scope field which were defined at the point
344 of the label or goto. This lets us look at older or newer
345 bindings in the scope, as appropriate. */
346 struct c_binding
*bindings_in_scope
;
347 /* The number of statement expressions that have started since this
348 label or goto statement was defined. This is zero if we are at
349 the same statement expression level. It is positive if we are in
350 a statement expression started since this spot. It is negative
351 if this spot was in a statement expression and we have left
354 /* Whether we started in a statement expression but are no longer in
355 it. This is set to true if stmt_exprs ever goes negative. */
359 /* This structure is used to keep track of bindings seen when a goto
360 statement is defined. This is only used if we see the goto
361 statement before we see the label. */
363 struct GTY(()) c_goto_bindings
{
364 /* The location of the goto statement. */
366 /* The bindings of the goto statement. */
367 struct c_spot_bindings goto_bindings
;
370 typedef struct c_goto_bindings
*c_goto_bindings_p
;
372 /* The additional information we keep track of for a label binding.
373 These fields are updated as scopes are popped. */
375 struct GTY(()) c_label_vars
{
376 /* The shadowed c_label_vars, when one label shadows another (which
377 can only happen using a __label__ declaration). */
378 struct c_label_vars
*shadowed
;
379 /* The bindings when the label was defined. */
380 struct c_spot_bindings label_bindings
;
381 /* A list of decls that we care about: decls about which we should
382 warn if a goto branches to this label from later in the function.
383 Decls are added to this list as scopes are popped. We only add
384 the decls that matter. */
385 vec
<tree
, va_gc
> *decls_in_scope
;
386 /* A list of goto statements to this label. This is only used for
387 goto statements seen before the label was defined, so that we can
388 issue appropriate warnings for them. */
389 vec
<c_goto_bindings_p
, va_gc
> *gotos
;
392 /* Each c_scope structure describes the complete contents of one
393 scope. Four scopes are distinguished specially: the innermost or
394 current scope, the innermost function scope, the file scope (always
395 the second to outermost) and the outermost or external scope.
397 Most declarations are recorded in the current scope.
399 All normal label declarations are recorded in the innermost
400 function scope, as are bindings of undeclared identifiers to
401 error_mark_node. (GCC permits nested functions as an extension,
402 hence the 'innermost' qualifier.) Explicitly declared labels
403 (using the __label__ extension) appear in the current scope.
405 Being in the file scope (current_scope == file_scope) causes
406 special behavior in several places below. Also, under some
407 conditions the Objective-C front end records declarations in the
408 file scope even though that isn't the current scope.
410 All declarations with external linkage are recorded in the external
411 scope, even if they aren't visible there; this models the fact that
412 such declarations are visible to the entire program, and (with a
413 bit of cleverness, see pushdecl) allows diagnosis of some violations
414 of C99 6.2.2p7 and 6.2.7p2:
416 If, within the same translation unit, the same identifier appears
417 with both internal and external linkage, the behavior is
420 All declarations that refer to the same object or function shall
421 have compatible type; otherwise, the behavior is undefined.
423 Initially only the built-in declarations, which describe compiler
424 intrinsic functions plus a subset of the standard library, are in
427 The order of the blocks list matters, and it is frequently appended
428 to. To avoid having to walk all the way to the end of the list on
429 each insertion, or reverse the list later, we maintain a pointer to
430 the last list entry. (FIXME: It should be feasible to use a reversed
433 The bindings list is strictly in reverse order of declarations;
434 pop_scope relies on this. */
437 struct GTY((chain_next ("%h.outer"))) c_scope
{
438 /* The scope containing this one. */
439 struct c_scope
*outer
;
441 /* The next outermost function scope. */
442 struct c_scope
*outer_function
;
444 /* All bindings in this scope. */
445 struct c_binding
*bindings
;
447 /* For each scope (except the global one), a chain of BLOCK nodes
448 for all the scopes that were entered and exited one level down. */
452 /* The depth of this scope. Used to keep the ->shadowed chain of
453 bindings sorted innermost to outermost. */
454 unsigned int depth
: 28;
456 /* True if we are currently filling this scope with parameter
458 BOOL_BITFIELD parm_flag
: 1;
460 /* True if we saw [*] in this scope. Used to give an error messages
461 if these appears in a function definition. */
462 BOOL_BITFIELD had_vla_unspec
: 1;
464 /* True if we already complained about forward parameter decls
465 in this scope. This prevents double warnings on
466 foo (int a; int b; ...) */
467 BOOL_BITFIELD warned_forward_parm_decls
: 1;
469 /* True if this is the outermost block scope of a function body.
470 This scope contains the parameters, the local variables declared
471 in the outermost block, and all the labels (except those in
472 nested functions, or declared at block scope with __label__). */
473 BOOL_BITFIELD function_body
: 1;
475 /* True means make a BLOCK for this scope no matter what. */
476 BOOL_BITFIELD keep
: 1;
478 /* True means that an unsuffixed float constant is _Decimal64. */
479 BOOL_BITFIELD float_const_decimal64
: 1;
481 /* True if this scope has any label bindings. This is used to speed
482 up searching for labels when popping scopes, particularly since
483 labels are normally only found at function scope. */
484 BOOL_BITFIELD has_label_bindings
: 1;
486 /* True if we should issue a warning if a goto statement crosses any
487 of the bindings. We still need to check the list of bindings to
488 find the specific ones we need to warn about. This is true if
489 decl_jump_unsafe would return true for any of the bindings. This
490 is used to avoid looping over all the bindings unnecessarily. */
491 BOOL_BITFIELD has_jump_unsafe_decl
: 1;
494 /* The scope currently in effect. */
496 static GTY(()) struct c_scope
*current_scope
;
498 /* The innermost function scope. Ordinary (not explicitly declared)
499 labels, bindings to error_mark_node, and the lazily-created
500 bindings of __func__ and its friends get this scope. */
502 static GTY(()) struct c_scope
*current_function_scope
;
504 /* The C file scope. This is reset for each input translation unit. */
506 static GTY(()) struct c_scope
*file_scope
;
508 /* The outermost scope. This is used for all declarations with
509 external linkage, and only these, hence the name. */
511 static GTY(()) struct c_scope
*external_scope
;
513 /* A chain of c_scope structures awaiting reuse. */
515 static GTY((deletable
)) struct c_scope
*scope_freelist
;
517 /* A chain of c_binding structures awaiting reuse. */
519 static GTY((deletable
)) struct c_binding
*binding_freelist
;
521 /* Append VAR to LIST in scope SCOPE. */
522 #define SCOPE_LIST_APPEND(scope, list, decl) do { \
523 struct c_scope *s_ = (scope); \
525 if (s_->list##_last) \
526 BLOCK_CHAIN (s_->list##_last) = d_; \
529 s_->list##_last = d_; \
532 /* Concatenate FROM in scope FSCOPE onto TO in scope TSCOPE. */
533 #define SCOPE_LIST_CONCAT(tscope, to, fscope, from) do { \
534 struct c_scope *t_ = (tscope); \
535 struct c_scope *f_ = (fscope); \
537 BLOCK_CHAIN (t_->to##_last) = f_->from; \
540 t_->to##_last = f_->from##_last; \
543 /* A c_inline_static structure stores details of a static identifier
544 referenced in a definition of a function that may be an inline
545 definition if no subsequent declaration of that function uses
546 "extern" or does not use "inline". */
548 struct GTY((chain_next ("%h.next"))) c_inline_static
{
549 /* The location for a diagnostic. */
552 /* The function that may be an inline definition. */
555 /* The object or function referenced. */
558 /* What sort of reference this is. */
559 enum c_inline_static_type type
;
561 /* The next such structure or NULL. */
562 struct c_inline_static
*next
;
565 /* List of static identifiers used or referenced in functions that may
566 be inline definitions. */
567 static GTY(()) struct c_inline_static
*c_inline_statics
;
569 /* True means unconditionally make a BLOCK for the next scope pushed. */
571 static bool keep_next_level_flag
;
573 /* True means the next call to push_scope will be the outermost scope
574 of a function body, so do not push a new scope, merely cease
575 expecting parameter decls. */
577 static bool next_is_function_body
;
579 /* A vector of pointers to c_binding structures. */
581 typedef struct c_binding
*c_binding_ptr
;
583 /* Information that we keep for a struct or union while it is being
586 class c_struct_parse_info
589 /* If warn_cxx_compat, a list of types defined within this
591 auto_vec
<tree
> struct_types
;
592 /* If warn_cxx_compat, a list of field names which have bindings,
593 and which are defined in this struct, but which are not defined
594 in any enclosing struct. This is used to clear the in_struct
595 field of the c_bindings structure. */
596 auto_vec
<c_binding_ptr
> fields
;
597 /* If warn_cxx_compat, a list of typedef names used when defining
598 fields in this struct. */
599 auto_vec
<tree
> typedefs_seen
;
602 /* Information for the struct or union currently being parsed, or
603 NULL if not parsing a struct or union. */
604 static class c_struct_parse_info
*struct_parse_info
;
606 /* Forward declarations. */
607 static tree
lookup_name_in_scope (tree
, struct c_scope
*);
608 static tree
c_make_fname_decl (location_t
, tree
, int);
609 static tree
grokdeclarator (const struct c_declarator
*,
610 struct c_declspecs
*,
611 enum decl_context
, bool, tree
*, tree
*, tree
*,
612 bool *, enum deprecated_states
);
613 static tree
grokparms (struct c_arg_info
*, bool);
614 static void layout_array_type (tree
);
615 static void warn_defaults_to (location_t
, int, const char *, ...)
616 ATTRIBUTE_GCC_DIAG(3,4);
617 static const char *header_for_builtin_fn (tree
);
619 /* T is a statement. Add it to the statement-tree. This is the
620 C/ObjC version--C++ has a slightly different version of this
626 enum tree_code code
= TREE_CODE (t
);
628 if (CAN_HAVE_LOCATION_P (t
) && code
!= LABEL_EXPR
)
630 if (!EXPR_HAS_LOCATION (t
))
631 SET_EXPR_LOCATION (t
, input_location
);
634 if (code
== LABEL_EXPR
|| code
== CASE_LABEL_EXPR
)
635 STATEMENT_LIST_HAS_LABEL (cur_stmt_list
) = 1;
637 /* Add T to the statement-tree. Non-side-effect statements need to be
638 recorded during statement expressions. */
639 if (!building_stmt_list_p ())
641 append_to_statement_list_force (t
, &cur_stmt_list
);
646 /* Build a pointer type using the default pointer mode. */
649 c_build_pointer_type (tree to_type
)
651 addr_space_t as
= to_type
== error_mark_node
? ADDR_SPACE_GENERIC
652 : TYPE_ADDR_SPACE (to_type
);
653 machine_mode pointer_mode
;
655 if (as
!= ADDR_SPACE_GENERIC
|| c_default_pointer_mode
== VOIDmode
)
656 pointer_mode
= targetm
.addr_space
.pointer_mode (as
);
658 pointer_mode
= c_default_pointer_mode
;
659 return build_pointer_type_for_mode (to_type
, pointer_mode
, false);
663 /* Return true if we will want to say something if a goto statement
667 decl_jump_unsafe (tree decl
)
669 if (error_operand_p (decl
))
672 /* Don't warn for compound literals. If a goto statement crosses
673 their initialization, it should cross also all the places where
674 the complit is used or where the complit address might be saved
675 into some variable, so code after the label to which goto jumps
676 should not be able to refer to the compound literal. */
677 if (VAR_P (decl
) && C_DECL_COMPOUND_LITERAL_P (decl
))
680 /* Always warn about crossing variably modified types. */
681 if ((VAR_P (decl
) || TREE_CODE (decl
) == TYPE_DECL
)
682 && variably_modified_type_p (TREE_TYPE (decl
), NULL_TREE
))
685 /* Otherwise, only warn if -Wgoto-misses-init and this is an
686 initialized automatic decl. */
687 if (warn_jump_misses_init
689 && !TREE_STATIC (decl
)
690 && DECL_INITIAL (decl
) != NULL_TREE
)
698 c_print_identifier (FILE *file
, tree node
, int indent
)
700 void (*save
) (enum c_oracle_request
, tree identifier
);
702 /* Temporarily hide any binding oracle. Without this, calls to
703 debug_tree from the debugger will end up calling into the oracle,
704 making for a confusing debug session. As the oracle isn't needed
705 here for normal operation, it's simplest to suppress it. */
706 save
= c_binding_oracle
;
707 c_binding_oracle
= NULL
;
709 print_node (file
, "symbol", I_SYMBOL_DECL (node
), indent
+ 4);
710 print_node (file
, "tag", I_TAG_DECL (node
), indent
+ 4);
711 print_node (file
, "label", I_LABEL_DECL (node
), indent
+ 4);
712 if (C_IS_RESERVED_WORD (node
) && C_RID_CODE (node
) != RID_CXX_COMPAT_WARN
)
714 tree rid
= ridpointers
[C_RID_CODE (node
)];
715 indent_to (file
, indent
+ 4);
716 fprintf (file
, "rid " HOST_PTR_PRINTF
" \"%s\"",
717 (void *) rid
, IDENTIFIER_POINTER (rid
));
720 c_binding_oracle
= save
;
723 /* Establish a binding between NAME, an IDENTIFIER_NODE, and DECL,
724 which may be any of several kinds of DECL or TYPE or error_mark_node,
725 in the scope SCOPE. */
727 bind (tree name
, tree decl
, struct c_scope
*scope
, bool invisible
,
728 bool nested
, location_t locus
)
730 struct c_binding
*b
, **here
;
732 if (binding_freelist
)
734 b
= binding_freelist
;
735 binding_freelist
= b
->prev
;
738 b
= ggc_alloc
<c_binding
> ();
743 b
->depth
= scope
->depth
;
744 b
->invisible
= invisible
;
752 b
->prev
= scope
->bindings
;
755 if (decl_jump_unsafe (decl
))
756 scope
->has_jump_unsafe_decl
= 1;
761 switch (TREE_CODE (decl
))
763 case LABEL_DECL
: here
= &I_LABEL_BINDING (name
); break;
766 case RECORD_TYPE
: here
= &I_TAG_BINDING (name
); break;
772 case ERROR_MARK
: here
= &I_SYMBOL_BINDING (name
); break;
778 /* Locate the appropriate place in the chain of shadowed decls
779 to insert this binding. Normally, scope == current_scope and
780 this does nothing. */
781 while (*here
&& (*here
)->depth
> scope
->depth
)
782 here
= &(*here
)->shadowed
;
788 /* Clear the binding structure B, stick it on the binding_freelist,
789 and return the former value of b->prev. This is used by pop_scope
790 and get_parm_info to iterate destructively over all the bindings
791 from a given scope. */
792 static struct c_binding
*
793 free_binding_and_advance (struct c_binding
*b
)
795 struct c_binding
*prev
= b
->prev
;
797 memset (b
, 0, sizeof (struct c_binding
));
798 b
->prev
= binding_freelist
;
799 binding_freelist
= b
;
804 /* Bind a label. Like bind, but skip fields which aren't used for
805 labels, and add the LABEL_VARS value. */
807 bind_label (tree name
, tree label
, struct c_scope
*scope
,
808 struct c_label_vars
*label_vars
)
812 bind (name
, label
, scope
, /*invisible=*/false, /*nested=*/false,
815 scope
->has_label_bindings
= true;
818 gcc_assert (b
->decl
== label
);
819 label_vars
->shadowed
= b
->u
.label
;
820 b
->u
.label
= label_vars
;
823 /* Hook called at end of compilation to assume 1 elt
824 for a file-scope tentative array defn that wasn't complete before. */
827 c_finish_incomplete_decl (tree decl
)
831 tree type
= TREE_TYPE (decl
);
832 if (type
!= error_mark_node
833 && TREE_CODE (type
) == ARRAY_TYPE
834 && !DECL_EXTERNAL (decl
)
835 && TYPE_DOMAIN (type
) == NULL_TREE
)
837 warning_at (DECL_SOURCE_LOCATION (decl
),
838 0, "array %q+D assumed to have one element", decl
);
840 complete_array_type (&TREE_TYPE (decl
), NULL_TREE
, true);
842 relayout_decl (decl
);
847 /* Record that inline function FUNC contains a reference (location
848 LOC) to static DECL (file-scope or function-local according to
852 record_inline_static (location_t loc
, tree func
, tree decl
,
853 enum c_inline_static_type type
)
855 c_inline_static
*csi
= ggc_alloc
<c_inline_static
> ();
857 csi
->function
= func
;
858 csi
->static_decl
= decl
;
860 csi
->next
= c_inline_statics
;
861 c_inline_statics
= csi
;
864 /* Check for references to static declarations in inline functions at
865 the end of the translation unit and diagnose them if the functions
866 are still inline definitions. */
869 check_inline_statics (void)
871 struct c_inline_static
*csi
;
872 for (csi
= c_inline_statics
; csi
; csi
= csi
->next
)
874 if (DECL_EXTERNAL (csi
->function
))
878 pedwarn (csi
->location
, 0,
879 "%qD is static but used in inline function %qD "
880 "which is not static", csi
->static_decl
, csi
->function
);
883 pedwarn (csi
->location
, 0,
884 "%q+D is static but declared in inline function %qD "
885 "which is not static", csi
->static_decl
, csi
->function
);
891 c_inline_statics
= NULL
;
894 /* Fill in a c_spot_bindings structure. If DEFINING is true, set it
895 for the current state, otherwise set it to uninitialized. */
898 set_spot_bindings (struct c_spot_bindings
*p
, bool defining
)
902 p
->scope
= current_scope
;
903 p
->bindings_in_scope
= current_scope
->bindings
;
908 p
->bindings_in_scope
= NULL
;
911 p
->left_stmt_expr
= false;
914 /* Update spot bindings P as we pop out of SCOPE. Return true if we
915 should push decls for a label. */
918 update_spot_bindings (struct c_scope
*scope
, struct c_spot_bindings
*p
)
920 if (p
->scope
!= scope
)
922 /* This label or goto is defined in some other scope, or it is a
923 label which is not yet defined. There is nothing to
928 /* Adjust the spot bindings to refer to the bindings already defined
929 in the enclosing scope. */
930 p
->scope
= scope
->outer
;
931 p
->bindings_in_scope
= p
->scope
->bindings
;
936 /* The Objective-C front-end often needs to determine the current scope. */
939 objc_get_current_scope (void)
941 return current_scope
;
944 /* The following function is used only by Objective-C. It needs to live here
945 because it accesses the innards of c_scope. */
948 objc_mark_locals_volatile (void *enclosing_blk
)
950 struct c_scope
*scope
;
953 for (scope
= current_scope
;
954 scope
&& scope
!= enclosing_blk
;
955 scope
= scope
->outer
)
957 for (b
= scope
->bindings
; b
; b
= b
->prev
)
958 objc_volatilize_decl (b
->decl
);
960 /* Do not climb up past the current function. */
961 if (scope
->function_body
)
966 /* Return true if we are in the global binding level. */
969 global_bindings_p (void)
971 return current_scope
== file_scope
;
974 /* Return true if we're declaring parameters in an old-style function
978 old_style_parameter_scope (void)
980 /* If processing parameters and there is no function statement list, we
981 * have an old-style function declaration. */
982 return (current_scope
->parm_flag
&& !DECL_SAVED_TREE (current_function_decl
));
986 keep_next_level (void)
988 keep_next_level_flag
= true;
991 /* Set the flag for the FLOAT_CONST_DECIMAL64 pragma being ON. */
994 set_float_const_decimal64 (void)
996 current_scope
->float_const_decimal64
= true;
999 /* Clear the flag for the FLOAT_CONST_DECIMAL64 pragma. */
1002 clear_float_const_decimal64 (void)
1004 current_scope
->float_const_decimal64
= false;
1007 /* Return nonzero if an unsuffixed float constant is _Decimal64. */
1010 float_const_decimal64_p (void)
1012 return current_scope
->float_const_decimal64
;
1015 /* Identify this scope as currently being filled with parameters. */
1018 declare_parm_level (void)
1020 current_scope
->parm_flag
= true;
1026 if (next_is_function_body
)
1028 /* This is the transition from the parameters to the top level
1029 of the function body. These are the same scope
1030 (C99 6.2.1p4,6) so we do not push another scope structure.
1031 next_is_function_body is set only by store_parm_decls, which
1032 in turn is called when and only when we are about to
1033 encounter the opening curly brace for the function body.
1035 The outermost block of a function always gets a BLOCK node,
1036 because the debugging output routines expect that each
1037 function has at least one BLOCK. */
1038 current_scope
->parm_flag
= false;
1039 current_scope
->function_body
= true;
1040 current_scope
->keep
= true;
1041 current_scope
->outer_function
= current_function_scope
;
1042 current_function_scope
= current_scope
;
1044 keep_next_level_flag
= false;
1045 next_is_function_body
= false;
1047 /* The FLOAT_CONST_DECIMAL64 pragma applies to nested scopes. */
1048 if (current_scope
->outer
)
1049 current_scope
->float_const_decimal64
1050 = current_scope
->outer
->float_const_decimal64
;
1052 current_scope
->float_const_decimal64
= false;
1056 struct c_scope
*scope
;
1059 scope
= scope_freelist
;
1060 scope_freelist
= scope
->outer
;
1063 scope
= ggc_cleared_alloc
<c_scope
> ();
1065 /* The FLOAT_CONST_DECIMAL64 pragma applies to nested scopes. */
1067 scope
->float_const_decimal64
= current_scope
->float_const_decimal64
;
1069 scope
->float_const_decimal64
= false;
1071 scope
->keep
= keep_next_level_flag
;
1072 scope
->outer
= current_scope
;
1073 scope
->depth
= current_scope
? (current_scope
->depth
+ 1) : 0;
1075 /* Check for scope depth overflow. Unlikely (2^28 == 268,435,456) but
1077 if (current_scope
&& scope
->depth
== 0)
1080 sorry ("GCC supports only %u nested scopes", scope
->depth
);
1083 current_scope
= scope
;
1084 keep_next_level_flag
= false;
1088 /* This is called when we are leaving SCOPE. For each label defined
1089 in SCOPE, add any appropriate decls to its decls_in_scope fields.
1090 These are the decls whose initialization will be skipped by a goto
1091 later in the function. */
1094 update_label_decls (struct c_scope
*scope
)
1101 if (s
->has_label_bindings
)
1103 struct c_binding
*b
;
1105 for (b
= s
->bindings
; b
!= NULL
; b
= b
->prev
)
1107 struct c_label_vars
*label_vars
;
1108 struct c_binding
*b1
;
1111 struct c_goto_bindings
*g
;
1113 if (TREE_CODE (b
->decl
) != LABEL_DECL
)
1115 label_vars
= b
->u
.label
;
1117 b1
= label_vars
->label_bindings
.bindings_in_scope
;
1118 if (label_vars
->label_bindings
.scope
== NULL
)
1121 hjud
= label_vars
->label_bindings
.scope
->has_jump_unsafe_decl
;
1122 if (update_spot_bindings (scope
, &label_vars
->label_bindings
))
1124 /* This label is defined in this scope. */
1127 for (; b1
!= NULL
; b1
= b1
->prev
)
1129 /* A goto from later in the function to this
1130 label will never see the initialization
1131 of B1, if any. Save it to issue a
1132 warning if needed. */
1133 if (decl_jump_unsafe (b1
->decl
))
1134 vec_safe_push(label_vars
->decls_in_scope
, b1
->decl
);
1139 /* Update the bindings of any goto statements associated
1141 FOR_EACH_VEC_SAFE_ELT (label_vars
->gotos
, ix
, g
)
1142 update_spot_bindings (scope
, &g
->goto_bindings
);
1146 /* Don't search beyond the current function. */
1147 if (s
== current_function_scope
)
1154 /* Set the TYPE_CONTEXT of all of TYPE's variants to CONTEXT. */
1157 set_type_context (tree type
, tree context
)
1159 for (type
= TYPE_MAIN_VARIANT (type
); type
;
1160 type
= TYPE_NEXT_VARIANT (type
))
1161 TYPE_CONTEXT (type
) = context
;
1164 /* Exit a scope. Restore the state of the identifier-decl mappings
1165 that were in effect when this scope was entered. Return a BLOCK
1166 node containing all the DECLs in this scope that are of interest
1167 to debug info generation. */
1172 struct c_scope
*scope
= current_scope
;
1173 tree block
, context
, p
;
1174 struct c_binding
*b
;
1176 bool functionbody
= scope
->function_body
;
1177 bool keep
= functionbody
|| scope
->keep
|| scope
->bindings
;
1179 update_label_decls (scope
);
1181 /* If appropriate, create a BLOCK to record the decls for the life
1182 of this function. */
1186 block
= make_node (BLOCK
);
1187 BLOCK_SUBBLOCKS (block
) = scope
->blocks
;
1188 TREE_USED (block
) = 1;
1190 /* In each subblock, record that this is its superior. */
1191 for (p
= scope
->blocks
; p
; p
= BLOCK_CHAIN (p
))
1192 BLOCK_SUPERCONTEXT (p
) = block
;
1194 BLOCK_VARS (block
) = NULL_TREE
;
1197 /* The TYPE_CONTEXTs for all of the tagged types belonging to this
1198 scope must be set so that they point to the appropriate
1199 construct, i.e. either to the current FUNCTION_DECL node, or
1200 else to the BLOCK node we just constructed.
1202 Note that for tagged types whose scope is just the formal
1203 parameter list for some function type specification, we can't
1204 properly set their TYPE_CONTEXTs here, because we don't have a
1205 pointer to the appropriate FUNCTION_TYPE node readily available
1206 to us. For those cases, the TYPE_CONTEXTs of the relevant tagged
1207 type nodes get set in `grokdeclarator' as soon as we have created
1208 the FUNCTION_TYPE node which will represent the "scope" for these
1209 "parameter list local" tagged types. */
1210 if (scope
->function_body
)
1211 context
= current_function_decl
;
1212 else if (scope
== file_scope
)
1215 = build_translation_unit_decl (get_identifier (main_input_filename
));
1216 context
= file_decl
;
1217 debug_hooks
->register_main_translation_unit (file_decl
);
1222 /* Clear all bindings in this scope. */
1223 for (b
= scope
->bindings
; b
; b
= free_binding_and_advance (b
))
1226 switch (TREE_CODE (p
))
1229 /* Warnings for unused labels, errors for undefined labels. */
1230 if (TREE_USED (p
) && !DECL_INITIAL (p
))
1232 error ("label %q+D used but not defined", p
);
1233 DECL_INITIAL (p
) = error_mark_node
;
1236 warn_for_unused_label (p
);
1238 /* Labels go in BLOCK_VARS. */
1239 DECL_CHAIN (p
) = BLOCK_VARS (block
);
1240 BLOCK_VARS (block
) = p
;
1241 gcc_assert (I_LABEL_BINDING (b
->id
) == b
);
1242 I_LABEL_BINDING (b
->id
) = b
->shadowed
;
1244 /* Also pop back to the shadowed label_vars. */
1245 release_tree_vector (b
->u
.label
->decls_in_scope
);
1246 b
->u
.label
= b
->u
.label
->shadowed
;
1252 set_type_context (p
, context
);
1254 /* Types may not have tag-names, in which case the type
1255 appears in the bindings list with b->id NULL. */
1258 gcc_assert (I_TAG_BINDING (b
->id
) == b
);
1259 I_TAG_BINDING (b
->id
) = b
->shadowed
;
1264 /* Propagate TREE_ADDRESSABLE from nested functions to their
1265 containing functions. */
1266 if (!TREE_ASM_WRITTEN (p
)
1267 && DECL_INITIAL (p
) != NULL_TREE
1268 && TREE_ADDRESSABLE (p
)
1269 && DECL_ABSTRACT_ORIGIN (p
) != NULL_TREE
1270 && DECL_ABSTRACT_ORIGIN (p
) != p
)
1271 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (p
)) = 1;
1272 if (!TREE_PUBLIC (p
)
1273 && !DECL_INITIAL (p
)
1275 && scope
!= file_scope
1276 && scope
!= external_scope
)
1278 error ("nested function %q+D declared but never defined", p
);
1279 undef_nested_function
= true;
1281 else if (DECL_DECLARED_INLINE_P (p
)
1283 && !DECL_INITIAL (p
))
1285 /* C99 6.7.4p6: "a function with external linkage... declared
1286 with an inline function specifier ... shall also be defined
1287 in the same translation unit." */
1288 if (!flag_gnu89_inline
1289 && !lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (p
))
1290 && scope
== external_scope
)
1291 pedwarn (input_location
, 0,
1292 "inline function %q+D declared but never defined", p
);
1293 DECL_EXTERNAL (p
) = 1;
1299 /* Warnings for unused variables. */
1300 if ((!TREE_USED (p
) || !DECL_READ_P (p
))
1301 && !warning_suppressed_p (p
, OPT_Wunused_but_set_variable
)
1302 && !DECL_IN_SYSTEM_HEADER (p
)
1304 && !DECL_ARTIFICIAL (p
)
1305 && scope
!= file_scope
1306 && scope
!= external_scope
)
1309 warning (OPT_Wunused_variable
, "unused variable %q+D", p
);
1310 else if (DECL_CONTEXT (p
) == current_function_decl
)
1311 warning_at (DECL_SOURCE_LOCATION (p
),
1312 OPT_Wunused_but_set_variable
,
1313 "variable %qD set but not used", p
);
1318 error ("type of array %q+D completed incompatibly with"
1319 " implicit initialization", p
);
1326 /* All of these go in BLOCK_VARS, but only if this is the
1327 binding in the home scope. */
1330 DECL_CHAIN (p
) = BLOCK_VARS (block
);
1331 BLOCK_VARS (block
) = p
;
1333 else if (VAR_OR_FUNCTION_DECL_P (p
) && scope
!= file_scope
)
1335 /* For block local externs add a special
1336 DECL_EXTERNAL decl for debug info generation. */
1337 tree extp
= copy_node (p
);
1339 DECL_EXTERNAL (extp
) = 1;
1340 TREE_STATIC (extp
) = 0;
1341 TREE_PUBLIC (extp
) = 1;
1342 DECL_INITIAL (extp
) = NULL_TREE
;
1343 DECL_LANG_SPECIFIC (extp
) = NULL
;
1344 DECL_CONTEXT (extp
) = current_function_decl
;
1345 if (TREE_CODE (p
) == FUNCTION_DECL
)
1347 DECL_RESULT (extp
) = NULL_TREE
;
1348 DECL_SAVED_TREE (extp
) = NULL_TREE
;
1349 DECL_STRUCT_FUNCTION (extp
) = NULL
;
1351 if (b
->locus
!= UNKNOWN_LOCATION
)
1352 DECL_SOURCE_LOCATION (extp
) = b
->locus
;
1353 DECL_CHAIN (extp
) = BLOCK_VARS (block
);
1354 BLOCK_VARS (block
) = extp
;
1356 /* If this is the file scope set DECL_CONTEXT of each decl to
1357 the TRANSLATION_UNIT_DECL. This makes same_translation_unit_p
1359 if (scope
== file_scope
)
1361 DECL_CONTEXT (p
) = context
;
1362 if (TREE_CODE (p
) == TYPE_DECL
1363 && TREE_TYPE (p
) != error_mark_node
)
1364 set_type_context (TREE_TYPE (p
), context
);
1368 /* Parameters go in DECL_ARGUMENTS, not BLOCK_VARS, and have
1369 already been put there by store_parm_decls. Unused-
1370 parameter warnings are handled by function.cc.
1371 error_mark_node obviously does not go in BLOCK_VARS and
1372 does not get unused-variable warnings. */
1375 /* It is possible for a decl not to have a name. We get
1376 here with b->id NULL in this case. */
1379 gcc_assert (I_SYMBOL_BINDING (b
->id
) == b
);
1380 I_SYMBOL_BINDING (b
->id
) = b
->shadowed
;
1381 if (b
->shadowed
&& b
->shadowed
->u
.type
)
1382 TREE_TYPE (b
->shadowed
->decl
) = b
->shadowed
->u
.type
;
1392 /* Dispose of the block that we just made inside some higher level. */
1393 if ((scope
->function_body
|| scope
== file_scope
) && context
)
1395 DECL_INITIAL (context
) = block
;
1396 BLOCK_SUPERCONTEXT (block
) = context
;
1398 else if (scope
->outer
)
1401 SCOPE_LIST_APPEND (scope
->outer
, blocks
, block
);
1402 /* If we did not make a block for the scope just exited, any
1403 blocks made for inner scopes must be carried forward so they
1404 will later become subblocks of something else. */
1405 else if (scope
->blocks
)
1406 SCOPE_LIST_CONCAT (scope
->outer
, blocks
, scope
, blocks
);
1409 /* Pop the current scope, and free the structure for reuse. */
1410 current_scope
= scope
->outer
;
1411 if (scope
->function_body
)
1412 current_function_scope
= scope
->outer_function
;
1414 memset (scope
, 0, sizeof (struct c_scope
));
1415 scope
->outer
= scope_freelist
;
1416 scope_freelist
= scope
;
1422 push_file_scope (void)
1430 file_scope
= current_scope
;
1432 start_fname_decls ();
1434 for (decl
= visible_builtins
; decl
; decl
= DECL_CHAIN (decl
))
1435 bind (DECL_NAME (decl
), decl
, file_scope
,
1436 /*invisible=*/false, /*nested=*/true, DECL_SOURCE_LOCATION (decl
));
1440 pop_file_scope (void)
1442 /* In case there were missing closebraces, get us back to the global
1444 while (current_scope
!= file_scope
)
1447 /* __FUNCTION__ is defined at file scope (""). This
1448 call may not be necessary as my tests indicate it
1449 still works without it. */
1450 finish_fname_decls ();
1452 check_inline_statics ();
1454 /* This is the point to write out a PCH if we're doing that.
1455 In that case we do not want to do anything else. */
1458 c_common_write_pch ();
1459 /* Ensure even the callers don't try to finalize the CU. */
1460 flag_syntax_only
= 1;
1464 /* Pop off the file scope and close this translation unit. */
1468 maybe_apply_pending_pragma_weaks ();
1471 /* Adjust the bindings for the start of a statement expression. */
1474 c_bindings_start_stmt_expr (struct c_spot_bindings
* switch_bindings
)
1476 struct c_scope
*scope
;
1478 for (scope
= current_scope
; scope
!= NULL
; scope
= scope
->outer
)
1480 struct c_binding
*b
;
1482 if (!scope
->has_label_bindings
)
1485 for (b
= scope
->bindings
; b
!= NULL
; b
= b
->prev
)
1487 struct c_label_vars
*label_vars
;
1489 struct c_goto_bindings
*g
;
1491 if (TREE_CODE (b
->decl
) != LABEL_DECL
)
1493 label_vars
= b
->u
.label
;
1494 ++label_vars
->label_bindings
.stmt_exprs
;
1495 FOR_EACH_VEC_SAFE_ELT (label_vars
->gotos
, ix
, g
)
1496 ++g
->goto_bindings
.stmt_exprs
;
1500 if (switch_bindings
!= NULL
)
1501 ++switch_bindings
->stmt_exprs
;
1504 /* Adjust the bindings for the end of a statement expression. */
1507 c_bindings_end_stmt_expr (struct c_spot_bindings
*switch_bindings
)
1509 struct c_scope
*scope
;
1511 for (scope
= current_scope
; scope
!= NULL
; scope
= scope
->outer
)
1513 struct c_binding
*b
;
1515 if (!scope
->has_label_bindings
)
1518 for (b
= scope
->bindings
; b
!= NULL
; b
= b
->prev
)
1520 struct c_label_vars
*label_vars
;
1522 struct c_goto_bindings
*g
;
1524 if (TREE_CODE (b
->decl
) != LABEL_DECL
)
1526 label_vars
= b
->u
.label
;
1527 --label_vars
->label_bindings
.stmt_exprs
;
1528 if (label_vars
->label_bindings
.stmt_exprs
< 0)
1530 label_vars
->label_bindings
.left_stmt_expr
= true;
1531 label_vars
->label_bindings
.stmt_exprs
= 0;
1533 FOR_EACH_VEC_SAFE_ELT (label_vars
->gotos
, ix
, g
)
1535 --g
->goto_bindings
.stmt_exprs
;
1536 if (g
->goto_bindings
.stmt_exprs
< 0)
1538 g
->goto_bindings
.left_stmt_expr
= true;
1539 g
->goto_bindings
.stmt_exprs
= 0;
1545 if (switch_bindings
!= NULL
)
1547 --switch_bindings
->stmt_exprs
;
1548 gcc_assert (switch_bindings
->stmt_exprs
>= 0);
1552 /* Push a definition or a declaration of struct, union or enum tag "name".
1553 "type" should be the type node.
1554 We assume that the tag "name" is not already defined, and has a location
1557 Note that the definition may really be just a forward reference.
1558 In that case, the TYPE_SIZE will be zero. */
1561 pushtag (location_t loc
, tree name
, tree type
)
1563 /* Record the identifier as the type's name if it has none. */
1564 if (name
&& !TYPE_NAME (type
))
1565 TYPE_NAME (type
) = name
;
1566 bind (name
, type
, current_scope
, /*invisible=*/false, /*nested=*/false, loc
);
1568 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1569 tagged type we just added to the current scope. This fake
1570 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1571 to output a representation of a tagged type, and it also gives
1572 us a convenient place to record the "scope start" address for the
1575 TYPE_STUB_DECL (type
) = pushdecl (build_decl (loc
,
1576 TYPE_DECL
, NULL_TREE
, type
));
1578 /* An approximation for now, so we can tell this is a function-scope tag.
1579 This will be updated in pop_scope. */
1580 TYPE_CONTEXT (type
) = DECL_CONTEXT (TYPE_STUB_DECL (type
));
1582 if (warn_cxx_compat
&& name
!= NULL_TREE
)
1584 struct c_binding
*b
= I_SYMBOL_BINDING (name
);
1587 && b
->decl
!= NULL_TREE
1588 && TREE_CODE (b
->decl
) == TYPE_DECL
1589 && (B_IN_CURRENT_SCOPE (b
)
1590 || (current_scope
== file_scope
&& B_IN_EXTERNAL_SCOPE (b
)))
1591 && (TYPE_MAIN_VARIANT (TREE_TYPE (b
->decl
))
1592 != TYPE_MAIN_VARIANT (type
)))
1594 auto_diagnostic_group d
;
1595 if (warning_at (loc
, OPT_Wc___compat
,
1596 ("using %qD as both a typedef and a tag is "
1597 "invalid in C++"), b
->decl
)
1598 && b
->locus
!= UNKNOWN_LOCATION
)
1599 inform (b
->locus
, "originally defined here");
1604 /* An exported interface to pushtag. This is used by the gdb plugin's
1605 binding oracle to introduce a new tag binding. */
1608 c_pushtag (location_t loc
, tree name
, tree type
)
1610 pushtag (loc
, name
, type
);
1613 /* An exported interface to bind a declaration. LOC is the location
1614 to use. DECL is the declaration to bind. The decl's name is used
1615 to determine how it is bound. If DECL is a VAR_DECL, then
1616 IS_GLOBAL determines whether the decl is put into the global (file
1617 and external) scope or the current function's scope; if DECL is not
1618 a VAR_DECL then it is always put into the file scope. */
1621 c_bind (location_t loc
, tree decl
, bool is_global
)
1623 struct c_scope
*scope
;
1624 bool nested
= false;
1626 if (!VAR_P (decl
) || current_function_scope
== NULL
)
1628 /* Types and functions are always considered to be global. */
1630 DECL_EXTERNAL (decl
) = 1;
1631 TREE_PUBLIC (decl
) = 1;
1635 /* Also bind it into the external scope. */
1636 bind (DECL_NAME (decl
), decl
, external_scope
, true, false, loc
);
1639 DECL_EXTERNAL (decl
) = 1;
1640 TREE_PUBLIC (decl
) = 1;
1644 DECL_CONTEXT (decl
) = current_function_decl
;
1645 TREE_PUBLIC (decl
) = 0;
1646 scope
= current_function_scope
;
1649 bind (DECL_NAME (decl
), decl
, scope
, false, nested
, loc
);
1653 /* Stores the first FILE*, const struct tm* etc. argument type (whatever
1654 it is) seen in a declaration of a file I/O etc. built-in, corresponding
1655 to the builtin_structptr_types array. Subsequent declarations of such
1656 built-ins are expected to refer to it rather than to fileptr_type_node,
1657 etc. which is just void* (or to any other type).
1658 Used only by match_builtin_function_types. */
1660 static const unsigned builtin_structptr_type_count
1661 = ARRAY_SIZE (builtin_structptr_types
);
1663 static GTY(()) tree last_structptr_types
[builtin_structptr_type_count
];
1665 /* Returns true if types T1 and T2 representing return types or types
1666 of function arguments are close enough to be considered interchangeable
1667 in redeclarations of built-in functions. */
1670 types_close_enough_to_match (tree t1
, tree t2
)
1672 return (TYPE_MODE (t1
) == TYPE_MODE (t2
)
1673 && POINTER_TYPE_P (t1
) == POINTER_TYPE_P (t2
)
1674 && FUNCTION_POINTER_TYPE_P (t1
) == FUNCTION_POINTER_TYPE_P (t2
));
1677 /* Subroutine of compare_decls. Allow harmless mismatches in return
1678 and argument types provided that the type modes match. Set *STRICT
1679 and *ARGNO to the expected argument type and number in case of
1680 an argument type mismatch or null and zero otherwise. Return
1681 a unified type given a suitable match, and 0 otherwise. */
1684 match_builtin_function_types (tree newtype
, tree oldtype
,
1685 tree
*strict
, unsigned *argno
)
1688 *strict
= NULL_TREE
;
1690 /* Accept the return type of the new declaration if it has the same
1691 mode and if they're both pointers or if neither is. */
1692 tree oldrettype
= TREE_TYPE (oldtype
);
1693 tree newrettype
= TREE_TYPE (newtype
);
1695 if (!types_close_enough_to_match (oldrettype
, newrettype
))
1698 /* Check that the return types are compatible but don't fail if they
1699 are not (e.g., int vs long in ILP32) and just let the caller know. */
1700 if (!comptypes (TYPE_MAIN_VARIANT (oldrettype
),
1701 TYPE_MAIN_VARIANT (newrettype
)))
1702 *strict
= oldrettype
;
1704 tree oldargs
= TYPE_ARG_TYPES (oldtype
);
1705 tree newargs
= TYPE_ARG_TYPES (newtype
);
1706 tree tryargs
= newargs
;
1708 const unsigned nlst
= ARRAY_SIZE (last_structptr_types
);
1709 const unsigned nbst
= ARRAY_SIZE (builtin_structptr_types
);
1711 gcc_checking_assert (nlst
== nbst
);
1713 for (unsigned i
= 1; oldargs
|| newargs
; ++i
)
1717 || !TREE_VALUE (oldargs
)
1718 || !TREE_VALUE (newargs
))
1721 tree oldtype
= TYPE_MAIN_VARIANT (TREE_VALUE (oldargs
));
1722 tree newtype
= TREE_VALUE (newargs
);
1723 if (newtype
== error_mark_node
)
1725 newtype
= TYPE_MAIN_VARIANT (newtype
);
1727 if (!types_close_enough_to_match (oldtype
, newtype
))
1731 if (POINTER_TYPE_P (oldtype
))
1732 /* Iterate over well-known struct types like FILE (whose types
1733 aren't known to us) and compare the pointer to each to
1734 the pointer argument. */
1735 for (j
= 0; j
< nbst
; ++j
)
1737 if (TREE_VALUE (oldargs
) != builtin_structptr_types
[j
].node
)
1739 /* Store the first FILE* etc. argument type (whatever it is), and
1740 expect any subsequent declarations of file I/O etc. built-ins
1741 to refer to it rather than to fileptr_type_node etc. which is
1742 just void* (or const void*). */
1743 if (last_structptr_types
[j
])
1745 if (!comptypes (last_structptr_types
[j
], newtype
))
1748 *strict
= last_structptr_types
[j
];
1752 last_structptr_types
[j
] = newtype
;
1756 if (j
== nbst
&& !comptypes (oldtype
, newtype
))
1758 if (POINTER_TYPE_P (oldtype
))
1760 /* For incompatible pointers, only reject differences in
1761 the unqualified variants of the referenced types but
1762 consider differences in qualifiers as benign (report
1763 those to caller via *STRICT below). */
1764 tree oldref
= TYPE_MAIN_VARIANT (TREE_TYPE (oldtype
));
1765 tree newref
= TYPE_MAIN_VARIANT (TREE_TYPE (newtype
));
1766 if (!comptypes (oldref
, newref
))
1777 oldargs
= TREE_CHAIN (oldargs
);
1778 newargs
= TREE_CHAIN (newargs
);
1781 tree trytype
= build_function_type (newrettype
, tryargs
);
1783 /* Allow declaration to change transaction_safe attribute. */
1784 tree oldattrs
= TYPE_ATTRIBUTES (oldtype
);
1785 tree oldtsafe
= lookup_attribute ("transaction_safe", oldattrs
);
1786 tree newattrs
= TYPE_ATTRIBUTES (newtype
);
1787 tree newtsafe
= lookup_attribute ("transaction_safe", newattrs
);
1788 if (oldtsafe
&& !newtsafe
)
1789 oldattrs
= remove_attribute ("transaction_safe", oldattrs
);
1790 else if (newtsafe
&& !oldtsafe
)
1791 oldattrs
= tree_cons (get_identifier ("transaction_safe"),
1792 NULL_TREE
, oldattrs
);
1794 return build_type_attribute_variant (trytype
, oldattrs
);
1797 /* Subroutine of diagnose_mismatched_decls. Check for function type
1798 mismatch involving an empty arglist vs a nonempty one and give clearer
1801 diagnose_arglist_conflict (tree newdecl
, tree olddecl
,
1802 tree newtype
, tree oldtype
)
1806 if (TREE_CODE (olddecl
) != FUNCTION_DECL
1807 || !comptypes (TREE_TYPE (oldtype
), TREE_TYPE (newtype
))
1808 || !((!prototype_p (oldtype
) && DECL_INITIAL (olddecl
) == NULL_TREE
)
1809 || (!prototype_p (newtype
) && DECL_INITIAL (newdecl
) == NULL_TREE
)))
1812 t
= TYPE_ARG_TYPES (oldtype
);
1814 t
= TYPE_ARG_TYPES (newtype
);
1815 for (; t
; t
= TREE_CHAIN (t
))
1817 tree type
= TREE_VALUE (t
);
1819 if (TREE_CHAIN (t
) == NULL_TREE
1820 && TYPE_MAIN_VARIANT (type
) != void_type_node
)
1822 inform (input_location
, "a parameter list with an ellipsis "
1823 "cannot match an empty parameter name list declaration");
1827 if (c_type_promotes_to (type
) != type
)
1829 inform (input_location
, "an argument type that has a default "
1830 "promotion cannot match an empty parameter name list "
1837 /* Another subroutine of diagnose_mismatched_decls. OLDDECL is an
1838 old-style function definition, NEWDECL is a prototype declaration.
1839 Diagnose inconsistencies in the argument list. Returns TRUE if
1840 the prototype is compatible, FALSE if not. */
1842 validate_proto_after_old_defn (tree newdecl
, tree newtype
, tree oldtype
)
1844 tree newargs
, oldargs
;
1847 #define END_OF_ARGLIST(t) ((t) == void_type_node)
1849 oldargs
= TYPE_ACTUAL_ARG_TYPES (oldtype
);
1850 newargs
= TYPE_ARG_TYPES (newtype
);
1855 tree oldargtype
= TREE_VALUE (oldargs
);
1856 tree newargtype
= TREE_VALUE (newargs
);
1858 if (oldargtype
== error_mark_node
|| newargtype
== error_mark_node
)
1861 oldargtype
= (TYPE_ATOMIC (oldargtype
)
1862 ? c_build_qualified_type (TYPE_MAIN_VARIANT (oldargtype
),
1864 : TYPE_MAIN_VARIANT (oldargtype
));
1865 newargtype
= (TYPE_ATOMIC (newargtype
)
1866 ? c_build_qualified_type (TYPE_MAIN_VARIANT (newargtype
),
1868 : TYPE_MAIN_VARIANT (newargtype
));
1870 if (END_OF_ARGLIST (oldargtype
) && END_OF_ARGLIST (newargtype
))
1873 /* Reaching the end of just one list means the two decls don't
1874 agree on the number of arguments. */
1875 if (END_OF_ARGLIST (oldargtype
))
1877 error ("prototype for %q+D declares more arguments "
1878 "than previous old-style definition", newdecl
);
1881 else if (END_OF_ARGLIST (newargtype
))
1883 error ("prototype for %q+D declares fewer arguments "
1884 "than previous old-style definition", newdecl
);
1888 /* Type for passing arg must be consistent with that declared
1890 else if (!comptypes (oldargtype
, newargtype
))
1892 error ("prototype for %q+D declares argument %d"
1893 " with incompatible type",
1898 oldargs
= TREE_CHAIN (oldargs
);
1899 newargs
= TREE_CHAIN (newargs
);
1903 /* If we get here, no errors were found, but do issue a warning
1904 for this poor-style construct. */
1905 warning (0, "prototype for %q+D follows non-prototype definition",
1908 #undef END_OF_ARGLIST
1911 /* Subroutine of diagnose_mismatched_decls. Report the location of DECL,
1912 first in a pair of mismatched declarations, using the diagnostic
1915 locate_old_decl (tree decl
)
1917 if (TREE_CODE (decl
) == FUNCTION_DECL
1918 && fndecl_built_in_p (decl
)
1919 && !C_DECL_DECLARED_BUILTIN (decl
))
1921 else if (DECL_INITIAL (decl
))
1922 inform (input_location
,
1923 "previous definition of %q+D with type %qT",
1924 decl
, TREE_TYPE (decl
));
1925 else if (C_DECL_IMPLICIT (decl
))
1926 inform (input_location
,
1927 "previous implicit declaration of %q+D with type %qT",
1928 decl
, TREE_TYPE (decl
));
1930 inform (input_location
,
1931 "previous declaration of %q+D with type %qT",
1932 decl
, TREE_TYPE (decl
));
1935 /* Subroutine of duplicate_decls. Compare NEWDECL to OLDDECL.
1936 Returns true if the caller should proceed to merge the two, false
1937 if OLDDECL should simply be discarded. As a side effect, issues
1938 all necessary diagnostics for invalid or poor-style combinations.
1939 If it returns true, writes the types of NEWDECL and OLDDECL to
1940 *NEWTYPEP and *OLDTYPEP - these may have been adjusted from
1941 TREE_TYPE (NEWDECL, OLDDECL) respectively. */
1944 diagnose_mismatched_decls (tree newdecl
, tree olddecl
,
1945 tree
*newtypep
, tree
*oldtypep
)
1947 tree newtype
, oldtype
;
1950 #define DECL_EXTERN_INLINE(DECL) (DECL_DECLARED_INLINE_P (DECL) \
1951 && DECL_EXTERNAL (DECL))
1953 /* If we have error_mark_node for either decl or type, just discard
1954 the previous decl - we're in an error cascade already. */
1955 if (olddecl
== error_mark_node
|| newdecl
== error_mark_node
)
1957 *oldtypep
= oldtype
= TREE_TYPE (olddecl
);
1958 *newtypep
= newtype
= TREE_TYPE (newdecl
);
1959 if (oldtype
== error_mark_node
|| newtype
== error_mark_node
)
1962 /* Two different categories of symbol altogether. This is an error
1963 unless OLDDECL is a builtin. OLDDECL will be discarded in any case. */
1964 if (TREE_CODE (olddecl
) != TREE_CODE (newdecl
))
1966 if (!(TREE_CODE (olddecl
) == FUNCTION_DECL
1967 && fndecl_built_in_p (olddecl
)
1968 && !C_DECL_DECLARED_BUILTIN (olddecl
)))
1970 auto_diagnostic_group d
;
1971 error ("%q+D redeclared as different kind of symbol", newdecl
);
1972 locate_old_decl (olddecl
);
1974 else if (TREE_PUBLIC (newdecl
))
1975 warning (OPT_Wbuiltin_declaration_mismatch
,
1976 "built-in function %q+D declared as non-function",
1979 warning (OPT_Wshadow
, "declaration of %q+D shadows "
1980 "a built-in function", newdecl
);
1984 /* Enumerators have no linkage, so may only be declared once in a
1986 if (TREE_CODE (olddecl
) == CONST_DECL
)
1988 auto_diagnostic_group d
;
1989 error ("redeclaration of enumerator %q+D", newdecl
);
1990 locate_old_decl (olddecl
);
1994 bool pedwarned
= false;
1995 bool warned
= false;
1996 bool enum_and_int_p
= false;
1997 auto_diagnostic_group d
;
1999 int comptypes_result
= comptypes_check_enum_int (oldtype
, newtype
,
2001 if (!comptypes_result
)
2003 if (TREE_CODE (olddecl
) == FUNCTION_DECL
2004 && fndecl_built_in_p (olddecl
, BUILT_IN_NORMAL
)
2005 && !C_DECL_DECLARED_BUILTIN (olddecl
))
2007 /* Accept "harmless" mismatches in function types such
2008 as missing qualifiers or int vs long when they're the same
2009 size. However, diagnose return and argument types that are
2010 incompatible according to language rules. */
2011 tree mismatch_expect
;
2012 unsigned mismatch_argno
;
2014 tree trytype
= match_builtin_function_types (newtype
, oldtype
,
2018 if (trytype
&& comptypes (newtype
, trytype
))
2019 *oldtypep
= oldtype
= trytype
;
2022 /* If types don't match for a built-in, throw away the
2023 built-in. No point in calling locate_old_decl here, it
2024 won't print anything. */
2025 const char *header
= header_for_builtin_fn (olddecl
);
2026 location_t loc
= DECL_SOURCE_LOCATION (newdecl
);
2027 if (warning_at (loc
, OPT_Wbuiltin_declaration_mismatch
,
2028 "conflicting types for built-in function %q+D; "
2033 /* Suggest the right header to include as the preferred
2034 solution rather than the spelling of the declaration. */
2035 rich_location
richloc (line_table
, loc
);
2036 maybe_add_include_fixit (&richloc
, header
, true);
2038 "%qD is declared in header %qs", olddecl
, header
);
2043 if (mismatch_expect
&& extra_warnings
)
2045 location_t newloc
= DECL_SOURCE_LOCATION (newdecl
);
2046 bool warned
= false;
2048 warned
= warning_at (newloc
, OPT_Wbuiltin_declaration_mismatch
,
2049 "mismatch in argument %u type of built-in "
2050 "function %qD; expected %qT",
2051 mismatch_argno
, newdecl
, mismatch_expect
);
2053 warned
= warning_at (newloc
, OPT_Wbuiltin_declaration_mismatch
,
2054 "mismatch in return type of built-in "
2055 "function %qD; expected %qT",
2056 newdecl
, mismatch_expect
);
2057 const char *header
= header_for_builtin_fn (olddecl
);
2058 if (warned
&& header
)
2060 rich_location
richloc (line_table
, newloc
);
2061 maybe_add_include_fixit (&richloc
, header
, true);
2063 "%qD is declared in header %qs", olddecl
, header
);
2067 else if (TREE_CODE (olddecl
) == FUNCTION_DECL
2068 && DECL_IS_UNDECLARED_BUILTIN (olddecl
))
2070 /* A conflicting function declaration for a predeclared
2071 function that isn't actually built in. Objective C uses
2072 these. The new declaration silently overrides everything
2073 but the volatility (i.e. noreturn) indication. See also
2074 below. FIXME: Make Objective C use normal builtins. */
2075 TREE_THIS_VOLATILE (newdecl
) |= TREE_THIS_VOLATILE (olddecl
);
2078 /* Permit void foo (...) to match int foo (...) if the latter is
2079 the definition and implicit int was used. See
2080 c-torture/compile/920625-2.c. */
2081 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
&& DECL_INITIAL (newdecl
)
2082 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype
)) == void_type_node
2083 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype
)) == integer_type_node
2084 && C_FUNCTION_IMPLICIT_INT (newdecl
) && !DECL_INITIAL (olddecl
))
2086 pedwarned
= pedwarn (input_location
, 0,
2087 "conflicting types for %q+D", newdecl
);
2088 /* Make sure we keep void as the return type. */
2089 TREE_TYPE (newdecl
) = *newtypep
= newtype
= oldtype
;
2090 C_FUNCTION_IMPLICIT_INT (newdecl
) = 0;
2092 /* Permit void foo (...) to match an earlier call to foo (...) with
2093 no declared type (thus, implicitly int). */
2094 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
2095 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype
)) == void_type_node
2096 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype
)) == integer_type_node
2097 && C_DECL_IMPLICIT (olddecl
) && !DECL_INITIAL (olddecl
))
2099 pedwarned
= pedwarn (input_location
, 0,
2100 "conflicting types for %q+D; have %qT",
2102 /* Make sure we keep void as the return type. */
2103 TREE_TYPE (olddecl
) = *oldtypep
= oldtype
= newtype
;
2107 int new_quals
= TYPE_QUALS (newtype
);
2108 int old_quals
= TYPE_QUALS (oldtype
);
2110 if (new_quals
!= old_quals
)
2112 addr_space_t new_addr
= DECODE_QUAL_ADDR_SPACE (new_quals
);
2113 addr_space_t old_addr
= DECODE_QUAL_ADDR_SPACE (old_quals
);
2114 if (new_addr
!= old_addr
)
2116 if (ADDR_SPACE_GENERIC_P (new_addr
))
2117 error ("conflicting named address spaces (generic vs %s) "
2119 c_addr_space_name (old_addr
), newdecl
);
2120 else if (ADDR_SPACE_GENERIC_P (old_addr
))
2121 error ("conflicting named address spaces (%s vs generic) "
2123 c_addr_space_name (new_addr
), newdecl
);
2125 error ("conflicting named address spaces (%s vs %s) "
2127 c_addr_space_name (new_addr
),
2128 c_addr_space_name (old_addr
),
2132 if (CLEAR_QUAL_ADDR_SPACE (new_quals
)
2133 != CLEAR_QUAL_ADDR_SPACE (old_quals
))
2134 error ("conflicting type qualifiers for %q+D", newdecl
);
2137 error ("conflicting types for %q+D; have %qT", newdecl
, newtype
);
2138 diagnose_arglist_conflict (newdecl
, olddecl
, newtype
, oldtype
);
2139 locate_old_decl (olddecl
);
2143 /* Warn about enum/integer type mismatches. They are compatible types
2144 (C2X 6.7.2.2/5), but may pose portability problems. */
2145 else if (enum_and_int_p
&& TREE_CODE (newdecl
) != TYPE_DECL
)
2146 warned
= warning_at (DECL_SOURCE_LOCATION (newdecl
),
2147 OPT_Wenum_int_mismatch
,
2148 "conflicting types for %q+D due to enum/integer "
2149 "mismatch; have %qT", newdecl
, newtype
);
2151 /* Redeclaration of a type is a constraint violation (6.7.2.3p1),
2152 but silently ignore the redeclaration if either is in a system
2153 header. (Conflicting redeclarations were handled above.) This
2154 is allowed for C11 if the types are the same, not just
2156 if (TREE_CODE (newdecl
) == TYPE_DECL
)
2158 bool types_different
= false;
2161 = comptypes_check_different_types (oldtype
, newtype
, &types_different
);
2163 if (comptypes_result
!= 1 || types_different
)
2165 error ("redefinition of typedef %q+D with different type", newdecl
);
2166 locate_old_decl (olddecl
);
2170 if (DECL_IN_SYSTEM_HEADER (newdecl
)
2171 || DECL_IN_SYSTEM_HEADER (olddecl
)
2172 || warning_suppressed_p (newdecl
, OPT_Wpedantic
)
2173 || warning_suppressed_p (olddecl
, OPT_Wpedantic
))
2174 return true; /* Allow OLDDECL to continue in use. */
2176 if (variably_modified_type_p (newtype
, NULL
))
2178 error ("redefinition of typedef %q+D with variably modified type",
2180 locate_old_decl (olddecl
);
2182 else if (pedwarn_c99 (input_location
, OPT_Wpedantic
,
2183 "redefinition of typedef %q+D", newdecl
))
2184 locate_old_decl (olddecl
);
2189 /* Function declarations can either be 'static' or 'extern' (no
2190 qualifier is equivalent to 'extern' - C99 6.2.2p5) and therefore
2191 can never conflict with each other on account of linkage
2192 (6.2.2p4). Multiple definitions are not allowed (6.9p3,5) but
2193 gnu89 mode permits two definitions if one is 'extern inline' and
2194 one is not. The non- extern-inline definition supersedes the
2195 extern-inline definition. */
2197 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2199 /* If you declare a built-in function name as static, or
2200 define the built-in with an old-style definition (so we
2201 can't validate the argument list) the built-in definition is
2202 overridden, but optionally warn this was a bad choice of name. */
2203 if (fndecl_built_in_p (olddecl
)
2204 && !C_DECL_DECLARED_BUILTIN (olddecl
))
2206 if (!TREE_PUBLIC (newdecl
)
2207 || (DECL_INITIAL (newdecl
)
2208 && !prototype_p (TREE_TYPE (newdecl
))))
2210 warning_at (DECL_SOURCE_LOCATION (newdecl
),
2211 OPT_Wshadow
, "declaration of %qD shadows "
2212 "a built-in function", newdecl
);
2213 /* Discard the old built-in function. */
2217 if (!prototype_p (TREE_TYPE (newdecl
)))
2219 /* Set for built-ins that take no arguments. */
2220 bool func_void_args
= false;
2221 if (tree at
= TYPE_ARG_TYPES (oldtype
))
2222 func_void_args
= VOID_TYPE_P (TREE_VALUE (at
));
2224 if (extra_warnings
&& !func_void_args
)
2225 warning_at (DECL_SOURCE_LOCATION (newdecl
),
2226 OPT_Wbuiltin_declaration_mismatch
,
2227 "declaration of built-in function %qD without "
2228 "a prototype; expected %qT",
2229 newdecl
, TREE_TYPE (olddecl
));
2233 if (DECL_INITIAL (newdecl
))
2235 if (DECL_INITIAL (olddecl
))
2237 /* If both decls are in the same TU and the new declaration
2238 isn't overriding an extern inline reject the new decl.
2239 In c99, no overriding is allowed in the same translation
2241 if ((!DECL_EXTERN_INLINE (olddecl
)
2242 || DECL_EXTERN_INLINE (newdecl
)
2243 || (!flag_gnu89_inline
2244 && (!DECL_DECLARED_INLINE_P (olddecl
)
2245 || !lookup_attribute ("gnu_inline",
2246 DECL_ATTRIBUTES (olddecl
)))
2247 && (!DECL_DECLARED_INLINE_P (newdecl
)
2248 || !lookup_attribute ("gnu_inline",
2249 DECL_ATTRIBUTES (newdecl
))))
2251 && same_translation_unit_p (newdecl
, olddecl
))
2253 auto_diagnostic_group d
;
2254 error ("redefinition of %q+D", newdecl
);
2255 locate_old_decl (olddecl
);
2260 /* If we have a prototype after an old-style function definition,
2261 the argument types must be checked specially. */
2262 else if (DECL_INITIAL (olddecl
)
2263 && !prototype_p (oldtype
) && prototype_p (newtype
)
2264 && TYPE_ACTUAL_ARG_TYPES (oldtype
))
2266 auto_diagnostic_group d
;
2267 if (!validate_proto_after_old_defn (newdecl
, newtype
, oldtype
))
2269 locate_old_decl (olddecl
);
2273 /* A non-static declaration (even an "extern") followed by a
2274 static declaration is undefined behavior per C99 6.2.2p3-5,7.
2275 The same is true for a static forward declaration at block
2276 scope followed by a non-static declaration/definition at file
2277 scope. Static followed by non-static at the same scope is
2278 not undefined behavior, and is the most convenient way to get
2279 some effects (see e.g. what unwind-dw2-fde-glibc.c does to
2280 the definition of _Unwind_Find_FDE in unwind-dw2-fde.c), but
2281 we do diagnose it if -Wtraditional. */
2282 if (TREE_PUBLIC (olddecl
) && !TREE_PUBLIC (newdecl
))
2284 /* Two exceptions to the rule. If olddecl is an extern
2285 inline, or a predeclared function that isn't actually
2286 built in, newdecl silently overrides olddecl. The latter
2287 occur only in Objective C; see also above. (FIXME: Make
2288 Objective C use normal builtins.) */
2289 if (!DECL_IS_UNDECLARED_BUILTIN (olddecl
)
2290 && !DECL_EXTERN_INLINE (olddecl
))
2292 auto_diagnostic_group d
;
2293 error ("static declaration of %q+D follows "
2294 "non-static declaration", newdecl
);
2295 locate_old_decl (olddecl
);
2299 else if (TREE_PUBLIC (newdecl
) && !TREE_PUBLIC (olddecl
))
2301 if (DECL_CONTEXT (olddecl
))
2303 auto_diagnostic_group d
;
2304 error ("non-static declaration of %q+D follows "
2305 "static declaration", newdecl
);
2306 locate_old_decl (olddecl
);
2309 else if (warn_traditional
)
2311 warned
|= warning (OPT_Wtraditional
,
2312 "non-static declaration of %q+D "
2313 "follows static declaration", newdecl
);
2317 /* Make sure gnu_inline attribute is either not present, or
2318 present on all inline decls. */
2319 if (DECL_DECLARED_INLINE_P (olddecl
)
2320 && DECL_DECLARED_INLINE_P (newdecl
))
2322 bool newa
= lookup_attribute ("gnu_inline",
2323 DECL_ATTRIBUTES (newdecl
)) != NULL
;
2324 bool olda
= lookup_attribute ("gnu_inline",
2325 DECL_ATTRIBUTES (olddecl
)) != NULL
;
2328 auto_diagnostic_group d
;
2329 error_at (input_location
, "%<gnu_inline%> attribute present on %q+D",
2330 newa
? newdecl
: olddecl
);
2331 error_at (DECL_SOURCE_LOCATION (newa
? olddecl
: newdecl
),
2336 else if (VAR_P (newdecl
))
2338 /* Only variables can be thread-local, and all declarations must
2339 agree on this property. */
2340 if (C_DECL_THREADPRIVATE_P (olddecl
) && !DECL_THREAD_LOCAL_P (newdecl
))
2342 /* Nothing to check. Since OLDDECL is marked threadprivate
2343 and NEWDECL does not have a thread-local attribute, we
2344 will merge the threadprivate attribute into NEWDECL. */
2347 else if (DECL_THREAD_LOCAL_P (newdecl
) != DECL_THREAD_LOCAL_P (olddecl
))
2349 auto_diagnostic_group d
;
2350 if (DECL_THREAD_LOCAL_P (newdecl
))
2351 error ("thread-local declaration of %q+D follows "
2352 "non-thread-local declaration", newdecl
);
2354 error ("non-thread-local declaration of %q+D follows "
2355 "thread-local declaration", newdecl
);
2357 locate_old_decl (olddecl
);
2361 /* Multiple initialized definitions are not allowed (6.9p3,5). */
2362 if (DECL_INITIAL (newdecl
) && DECL_INITIAL (olddecl
))
2364 auto_diagnostic_group d
;
2365 error ("redefinition of %q+D", newdecl
);
2366 locate_old_decl (olddecl
);
2370 /* Objects declared at file scope: if the first declaration had
2371 external linkage (even if it was an external reference) the
2372 second must have external linkage as well, or the behavior is
2373 undefined. If the first declaration had internal linkage, then
2374 the second must too, or else be an external reference (in which
2375 case the composite declaration still has internal linkage).
2376 As for function declarations, we warn about the static-then-
2377 extern case only for -Wtraditional. See generally 6.2.2p3-5,7. */
2378 if (DECL_FILE_SCOPE_P (newdecl
)
2379 && TREE_PUBLIC (newdecl
) != TREE_PUBLIC (olddecl
))
2381 if (DECL_EXTERNAL (newdecl
))
2383 if (!DECL_FILE_SCOPE_P (olddecl
))
2385 auto_diagnostic_group d
;
2386 error ("extern declaration of %q+D follows "
2387 "declaration with no linkage", newdecl
);
2388 locate_old_decl (olddecl
);
2391 else if (warn_traditional
)
2393 warned
|= warning (OPT_Wtraditional
,
2394 "non-static declaration of %q+D "
2395 "follows static declaration", newdecl
);
2400 auto_diagnostic_group d
;
2401 if (TREE_PUBLIC (newdecl
))
2402 error ("non-static declaration of %q+D follows "
2403 "static declaration", newdecl
);
2405 error ("static declaration of %q+D follows "
2406 "non-static declaration", newdecl
);
2408 locate_old_decl (olddecl
);
2412 /* Two objects with the same name declared at the same block
2413 scope must both be external references (6.7p3). */
2414 else if (!DECL_FILE_SCOPE_P (newdecl
))
2416 if (DECL_EXTERNAL (newdecl
))
2418 /* Extern with initializer at block scope, which will
2419 already have received an error. */
2421 else if (DECL_EXTERNAL (olddecl
))
2423 auto_diagnostic_group d
;
2424 error ("declaration of %q+D with no linkage follows "
2425 "extern declaration", newdecl
);
2426 locate_old_decl (olddecl
);
2430 auto_diagnostic_group d
;
2431 error ("redeclaration of %q+D with no linkage", newdecl
);
2432 locate_old_decl (olddecl
);
2438 /* C++ does not permit a decl to appear multiple times at file
2441 && DECL_FILE_SCOPE_P (newdecl
)
2442 && !DECL_EXTERNAL (newdecl
)
2443 && !DECL_EXTERNAL (olddecl
))
2444 warned
|= warning_at (DECL_SOURCE_LOCATION (newdecl
),
2446 ("duplicate declaration of %qD is "
2452 /* All decls must agree on a visibility. */
2453 if (CODE_CONTAINS_STRUCT (TREE_CODE (newdecl
), TS_DECL_WITH_VIS
)
2454 && DECL_VISIBILITY_SPECIFIED (newdecl
) && DECL_VISIBILITY_SPECIFIED (olddecl
)
2455 && DECL_VISIBILITY (newdecl
) != DECL_VISIBILITY (olddecl
))
2457 warned
|= warning (0, "redeclaration of %q+D with different visibility "
2458 "(old visibility preserved)", newdecl
);
2461 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2462 warned
|= diagnose_mismatched_attributes (olddecl
, newdecl
);
2463 else /* PARM_DECL, VAR_DECL */
2465 /* Redeclaration of a parameter is a constraint violation (this is
2466 not explicitly stated, but follows from C99 6.7p3 [no more than
2467 one declaration of the same identifier with no linkage in the
2468 same scope, except type tags] and 6.2.2p6 [parameters have no
2469 linkage]). We must check for a forward parameter declaration,
2470 indicated by TREE_ASM_WRITTEN on the old declaration - this is
2471 an extension, the mandatory diagnostic for which is handled by
2472 mark_forward_parm_decls. */
2474 if (TREE_CODE (newdecl
) == PARM_DECL
2475 && (!TREE_ASM_WRITTEN (olddecl
) || TREE_ASM_WRITTEN (newdecl
)))
2477 auto_diagnostic_group d
;
2478 error ("redefinition of parameter %q+D", newdecl
);
2479 locate_old_decl (olddecl
);
2484 /* Optional warning for completely redundant decls. */
2485 if (!warned
&& !pedwarned
2486 && warn_redundant_decls
2487 /* Don't warn about a function declaration followed by a
2489 && !(TREE_CODE (newdecl
) == FUNCTION_DECL
2490 && DECL_INITIAL (newdecl
) && !DECL_INITIAL (olddecl
))
2491 /* Don't warn about redundant redeclarations of builtins. */
2492 && !(TREE_CODE (newdecl
) == FUNCTION_DECL
2493 && !fndecl_built_in_p (newdecl
)
2494 && fndecl_built_in_p (olddecl
)
2495 && !C_DECL_DECLARED_BUILTIN (olddecl
))
2496 /* Don't warn about an extern followed by a definition. */
2497 && !(DECL_EXTERNAL (olddecl
) && !DECL_EXTERNAL (newdecl
))
2498 /* Don't warn about forward parameter decls. */
2499 && !(TREE_CODE (newdecl
) == PARM_DECL
2500 && TREE_ASM_WRITTEN (olddecl
) && !TREE_ASM_WRITTEN (newdecl
))
2501 /* Don't warn about a variable definition following a declaration. */
2502 && !(VAR_P (newdecl
)
2503 && DECL_INITIAL (newdecl
) && !DECL_INITIAL (olddecl
)))
2505 warned
= warning (OPT_Wredundant_decls
, "redundant redeclaration of %q+D",
2509 /* Report location of previous decl/defn. */
2510 if (warned
|| pedwarned
)
2511 locate_old_decl (olddecl
);
2513 #undef DECL_EXTERN_INLINE
2518 /* Subroutine of duplicate_decls. NEWDECL has been found to be
2519 consistent with OLDDECL, but carries new information. Merge the
2520 new information into OLDDECL. This function issues no
2524 merge_decls (tree newdecl
, tree olddecl
, tree newtype
, tree oldtype
)
2526 bool new_is_definition
= (TREE_CODE (newdecl
) == FUNCTION_DECL
2527 && DECL_INITIAL (newdecl
) != NULL_TREE
);
2528 bool new_is_prototype
= (TREE_CODE (newdecl
) == FUNCTION_DECL
2529 && prototype_p (TREE_TYPE (newdecl
)));
2530 bool old_is_prototype
= (TREE_CODE (olddecl
) == FUNCTION_DECL
2531 && prototype_p (TREE_TYPE (olddecl
)));
2533 /* For real parm decl following a forward decl, rechain the old decl
2534 in its new location and clear TREE_ASM_WRITTEN (it's not a
2535 forward decl anymore). */
2536 if (TREE_CODE (newdecl
) == PARM_DECL
2537 && TREE_ASM_WRITTEN (olddecl
) && !TREE_ASM_WRITTEN (newdecl
))
2539 struct c_binding
*b
, **here
;
2541 for (here
= ¤t_scope
->bindings
; *here
; here
= &(*here
)->prev
)
2542 if ((*here
)->decl
== olddecl
)
2549 b
->prev
= current_scope
->bindings
;
2550 current_scope
->bindings
= b
;
2552 TREE_ASM_WRITTEN (olddecl
) = 0;
2555 DECL_ATTRIBUTES (newdecl
)
2556 = targetm
.merge_decl_attributes (olddecl
, newdecl
);
2558 /* For typedefs use the old type, as the new type's DECL_NAME points
2559 at newdecl, which will be ggc_freed. */
2560 if (TREE_CODE (newdecl
) == TYPE_DECL
)
2562 /* But NEWTYPE might have an attribute, honor that. */
2566 if (TYPE_USER_ALIGN (tem
))
2568 if (TYPE_ALIGN (tem
) > TYPE_ALIGN (newtype
))
2569 SET_TYPE_ALIGN (newtype
, TYPE_ALIGN (tem
));
2570 TYPE_USER_ALIGN (newtype
) = true;
2573 /* And remove the new type from the variants list. */
2574 if (TYPE_NAME (TREE_TYPE (newdecl
)) == newdecl
)
2576 tree remove
= TREE_TYPE (newdecl
);
2577 if (TYPE_MAIN_VARIANT (remove
) == remove
)
2579 gcc_assert (TYPE_NEXT_VARIANT (remove
) == NULL_TREE
);
2580 /* If remove is the main variant, no need to remove that
2581 from the list. One of the DECL_ORIGINAL_TYPE
2582 variants, e.g. created for aligned attribute, might still
2583 refer to the newdecl TYPE_DECL though, so remove that one
2585 if (DECL_ORIGINAL_TYPE (newdecl
)
2586 && DECL_ORIGINAL_TYPE (newdecl
) != remove
)
2587 for (tree t
= TYPE_MAIN_VARIANT (DECL_ORIGINAL_TYPE (newdecl
));
2588 t
; t
= TYPE_MAIN_VARIANT (t
))
2589 if (TYPE_NAME (TYPE_NEXT_VARIANT (t
)) == newdecl
)
2591 TYPE_NEXT_VARIANT (t
)
2592 = TYPE_NEXT_VARIANT (TYPE_NEXT_VARIANT (t
));
2597 for (tree t
= TYPE_MAIN_VARIANT (remove
); ;
2598 t
= TYPE_NEXT_VARIANT (t
))
2599 if (TYPE_NEXT_VARIANT (t
) == remove
)
2601 TYPE_NEXT_VARIANT (t
) = TYPE_NEXT_VARIANT (remove
);
2607 /* Merge the data types specified in the two decls. */
2609 = TREE_TYPE (olddecl
)
2610 = composite_type (newtype
, oldtype
);
2612 /* Lay the type out, unless already done. */
2613 if (!comptypes (oldtype
, TREE_TYPE (newdecl
)))
2615 if (TREE_TYPE (newdecl
) != error_mark_node
)
2616 layout_type (TREE_TYPE (newdecl
));
2617 if (TREE_CODE (newdecl
) != FUNCTION_DECL
2618 && TREE_CODE (newdecl
) != TYPE_DECL
2619 && TREE_CODE (newdecl
) != CONST_DECL
)
2620 layout_decl (newdecl
, 0);
2624 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
2625 DECL_SIZE (newdecl
) = DECL_SIZE (olddecl
);
2626 DECL_SIZE_UNIT (newdecl
) = DECL_SIZE_UNIT (olddecl
);
2627 SET_DECL_MODE (newdecl
, DECL_MODE (olddecl
));
2628 if (DECL_ALIGN (olddecl
) > DECL_ALIGN (newdecl
))
2630 SET_DECL_ALIGN (newdecl
, DECL_ALIGN (olddecl
));
2631 DECL_USER_ALIGN (newdecl
) |= DECL_USER_ALIGN (olddecl
);
2633 else if (DECL_ALIGN (olddecl
) == DECL_ALIGN (newdecl
)
2634 && DECL_USER_ALIGN (olddecl
) != DECL_USER_ALIGN (newdecl
))
2635 DECL_USER_ALIGN (newdecl
) = 1;
2636 if (DECL_WARN_IF_NOT_ALIGN (olddecl
)
2637 > DECL_WARN_IF_NOT_ALIGN (newdecl
))
2638 SET_DECL_WARN_IF_NOT_ALIGN (newdecl
,
2639 DECL_WARN_IF_NOT_ALIGN (olddecl
));
2642 /* Keep the old rtl since we can safely use it. */
2643 if (HAS_RTL_P (olddecl
))
2644 COPY_DECL_RTL (olddecl
, newdecl
);
2646 /* Merge the type qualifiers. */
2647 if (TREE_READONLY (newdecl
))
2648 TREE_READONLY (olddecl
) = 1;
2650 if (TREE_THIS_VOLATILE (newdecl
))
2651 TREE_THIS_VOLATILE (olddecl
) = 1;
2653 /* Merge deprecatedness. */
2654 if (TREE_DEPRECATED (newdecl
))
2655 TREE_DEPRECATED (olddecl
) = 1;
2657 /* Merge unavailability. */
2658 if (TREE_UNAVAILABLE (newdecl
))
2659 TREE_UNAVAILABLE (olddecl
) = 1;
2661 /* If a decl is in a system header and the other isn't, keep the one on the
2662 system header. Otherwise, keep source location of definition rather than
2663 declaration and of prototype rather than non-prototype unless that
2664 prototype is built-in. */
2665 if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl
), TS_DECL_WITH_VIS
)
2666 && DECL_IN_SYSTEM_HEADER (olddecl
)
2667 && !DECL_IN_SYSTEM_HEADER (newdecl
) )
2668 DECL_SOURCE_LOCATION (newdecl
) = DECL_SOURCE_LOCATION (olddecl
);
2669 else if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl
), TS_DECL_WITH_VIS
)
2670 && DECL_IN_SYSTEM_HEADER (newdecl
)
2671 && !DECL_IN_SYSTEM_HEADER (olddecl
))
2672 DECL_SOURCE_LOCATION (olddecl
) = DECL_SOURCE_LOCATION (newdecl
);
2673 else if ((DECL_INITIAL (newdecl
) == NULL_TREE
2674 && DECL_INITIAL (olddecl
) != NULL_TREE
)
2675 || (old_is_prototype
&& !new_is_prototype
2676 && !C_DECL_BUILTIN_PROTOTYPE (olddecl
)))
2677 DECL_SOURCE_LOCATION (newdecl
) = DECL_SOURCE_LOCATION (olddecl
);
2679 /* Merge the initialization information. */
2680 if (DECL_INITIAL (newdecl
) == NULL_TREE
)
2681 DECL_INITIAL (newdecl
) = DECL_INITIAL (olddecl
);
2683 /* Merge the threadprivate attribute. */
2684 if (VAR_P (olddecl
) && C_DECL_THREADPRIVATE_P (olddecl
))
2685 C_DECL_THREADPRIVATE_P (newdecl
) = 1;
2687 if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl
), TS_DECL_WITH_VIS
))
2689 /* Copy the assembler name.
2690 Currently, it can only be defined in the prototype. */
2691 COPY_DECL_ASSEMBLER_NAME (olddecl
, newdecl
);
2693 /* Use visibility of whichever declaration had it specified */
2694 if (DECL_VISIBILITY_SPECIFIED (olddecl
))
2696 DECL_VISIBILITY (newdecl
) = DECL_VISIBILITY (olddecl
);
2697 DECL_VISIBILITY_SPECIFIED (newdecl
) = 1;
2700 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2702 DECL_STATIC_CONSTRUCTOR(newdecl
) |= DECL_STATIC_CONSTRUCTOR(olddecl
);
2703 DECL_STATIC_DESTRUCTOR (newdecl
) |= DECL_STATIC_DESTRUCTOR (olddecl
);
2704 DECL_NO_LIMIT_STACK (newdecl
) |= DECL_NO_LIMIT_STACK (olddecl
);
2705 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl
)
2706 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl
);
2707 TREE_THIS_VOLATILE (newdecl
) |= TREE_THIS_VOLATILE (olddecl
);
2708 DECL_IS_MALLOC (newdecl
) |= DECL_IS_MALLOC (olddecl
);
2709 if (DECL_IS_OPERATOR_NEW_P (olddecl
))
2710 DECL_SET_IS_OPERATOR_NEW (newdecl
, true);
2711 if (DECL_IS_OPERATOR_DELETE_P (olddecl
))
2712 DECL_SET_IS_OPERATOR_DELETE (newdecl
, true);
2713 TREE_READONLY (newdecl
) |= TREE_READONLY (olddecl
);
2714 DECL_PURE_P (newdecl
) |= DECL_PURE_P (olddecl
);
2715 DECL_IS_NOVOPS (newdecl
) |= DECL_IS_NOVOPS (olddecl
);
2718 /* Merge the storage class information. */
2719 merge_weak (newdecl
, olddecl
);
2721 /* For functions, static overrides non-static. */
2722 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2724 TREE_PUBLIC (newdecl
) &= TREE_PUBLIC (olddecl
);
2725 /* This is since we don't automatically
2726 copy the attributes of NEWDECL into OLDDECL. */
2727 TREE_PUBLIC (olddecl
) = TREE_PUBLIC (newdecl
);
2728 /* If this clears `static', clear it in the identifier too. */
2729 if (!TREE_PUBLIC (olddecl
))
2730 TREE_PUBLIC (DECL_NAME (olddecl
)) = 0;
2734 /* In c99, 'extern' declaration before (or after) 'inline' means this
2735 function is not DECL_EXTERNAL, unless 'gnu_inline' attribute
2737 if (TREE_CODE (newdecl
) == FUNCTION_DECL
2738 && !flag_gnu89_inline
2739 && (DECL_DECLARED_INLINE_P (newdecl
)
2740 || DECL_DECLARED_INLINE_P (olddecl
))
2741 && (!DECL_DECLARED_INLINE_P (newdecl
)
2742 || !DECL_DECLARED_INLINE_P (olddecl
)
2743 || !DECL_EXTERNAL (olddecl
))
2744 && DECL_EXTERNAL (newdecl
)
2745 && !lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (newdecl
))
2746 && !current_function_decl
)
2747 DECL_EXTERNAL (newdecl
) = 0;
2749 /* An inline definition following a static declaration is not
2751 if (new_is_definition
2752 && (DECL_DECLARED_INLINE_P (newdecl
)
2753 || DECL_DECLARED_INLINE_P (olddecl
))
2754 && !TREE_PUBLIC (olddecl
))
2755 DECL_EXTERNAL (newdecl
) = 0;
2757 if (DECL_EXTERNAL (newdecl
))
2759 TREE_STATIC (newdecl
) = TREE_STATIC (olddecl
);
2760 DECL_EXTERNAL (newdecl
) = DECL_EXTERNAL (olddecl
);
2762 /* An extern decl does not override previous storage class. */
2763 TREE_PUBLIC (newdecl
) = TREE_PUBLIC (olddecl
);
2764 if (!DECL_EXTERNAL (newdecl
))
2766 DECL_CONTEXT (newdecl
) = DECL_CONTEXT (olddecl
);
2767 DECL_COMMON (newdecl
) = DECL_COMMON (olddecl
);
2772 TREE_STATIC (olddecl
) = TREE_STATIC (newdecl
);
2773 TREE_PUBLIC (olddecl
) = TREE_PUBLIC (newdecl
);
2776 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2778 /* If we're redefining a function previously defined as extern
2779 inline, make sure we emit debug info for the inline before we
2780 throw it away, in case it was inlined into a function that
2781 hasn't been written out yet. */
2782 if (new_is_definition
&& DECL_INITIAL (olddecl
))
2783 /* The new defn must not be inline. */
2784 DECL_UNINLINABLE (newdecl
) = 1;
2787 /* If either decl says `inline', this fn is inline, unless
2788 its definition was passed already. */
2789 if (DECL_DECLARED_INLINE_P (newdecl
)
2790 || DECL_DECLARED_INLINE_P (olddecl
))
2791 DECL_DECLARED_INLINE_P (newdecl
) = 1;
2793 DECL_UNINLINABLE (newdecl
) = DECL_UNINLINABLE (olddecl
)
2794 = (DECL_UNINLINABLE (newdecl
) || DECL_UNINLINABLE (olddecl
));
2796 DECL_DISREGARD_INLINE_LIMITS (newdecl
)
2797 = DECL_DISREGARD_INLINE_LIMITS (olddecl
)
2798 = (DECL_DISREGARD_INLINE_LIMITS (newdecl
)
2799 || DECL_DISREGARD_INLINE_LIMITS (olddecl
));
2802 if (fndecl_built_in_p (olddecl
))
2804 /* If redeclaring a builtin function, it stays built in.
2805 But it gets tagged as having been declared. */
2806 copy_decl_built_in_function (newdecl
, olddecl
);
2807 C_DECL_DECLARED_BUILTIN (newdecl
) = 1;
2808 if (new_is_prototype
)
2810 C_DECL_BUILTIN_PROTOTYPE (newdecl
) = 0;
2811 if (DECL_BUILT_IN_CLASS (newdecl
) == BUILT_IN_NORMAL
)
2813 enum built_in_function fncode
= DECL_FUNCTION_CODE (newdecl
);
2816 /* If a compatible prototype of these builtin functions
2817 is seen, assume the runtime implements it with the
2818 expected semantics. */
2819 case BUILT_IN_STPCPY
:
2820 if (builtin_decl_explicit_p (fncode
))
2821 set_builtin_decl_implicit_p (fncode
, true);
2824 if (builtin_decl_explicit_p (fncode
))
2825 set_builtin_decl_declared_p (fncode
, true);
2829 copy_attributes_to_builtin (newdecl
);
2833 C_DECL_BUILTIN_PROTOTYPE (newdecl
)
2834 = C_DECL_BUILTIN_PROTOTYPE (olddecl
);
2837 /* Preserve function specific target and optimization options */
2838 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl
)
2839 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl
))
2840 DECL_FUNCTION_SPECIFIC_TARGET (newdecl
)
2841 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl
);
2843 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl
)
2844 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl
))
2845 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl
)
2846 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl
);
2848 /* Also preserve various other info from the definition. */
2849 if (!new_is_definition
)
2852 DECL_RESULT (newdecl
) = DECL_RESULT (olddecl
);
2853 DECL_INITIAL (newdecl
) = DECL_INITIAL (olddecl
);
2854 DECL_STRUCT_FUNCTION (newdecl
) = DECL_STRUCT_FUNCTION (olddecl
);
2855 DECL_SAVED_TREE (newdecl
) = DECL_SAVED_TREE (olddecl
);
2856 DECL_ARGUMENTS (newdecl
) = copy_list (DECL_ARGUMENTS (olddecl
));
2857 for (t
= DECL_ARGUMENTS (newdecl
); t
; t
= DECL_CHAIN (t
))
2858 DECL_CONTEXT (t
) = newdecl
;
2860 /* See if we've got a function to instantiate from. */
2861 if (DECL_SAVED_TREE (olddecl
))
2862 DECL_ABSTRACT_ORIGIN (newdecl
)
2863 = DECL_ABSTRACT_ORIGIN (olddecl
);
2867 /* Merge the USED information. */
2868 if (TREE_USED (olddecl
))
2869 TREE_USED (newdecl
) = 1;
2870 else if (TREE_USED (newdecl
))
2871 TREE_USED (olddecl
) = 1;
2872 if (VAR_P (olddecl
) || TREE_CODE (olddecl
) == PARM_DECL
)
2873 DECL_READ_P (newdecl
) |= DECL_READ_P (olddecl
);
2874 if (DECL_PRESERVE_P (olddecl
))
2875 DECL_PRESERVE_P (newdecl
) = 1;
2876 else if (DECL_PRESERVE_P (newdecl
))
2877 DECL_PRESERVE_P (olddecl
) = 1;
2879 /* Merge DECL_COMMON */
2880 if (VAR_P (olddecl
) && VAR_P (newdecl
)
2881 && !lookup_attribute ("common", DECL_ATTRIBUTES (newdecl
))
2882 && !lookup_attribute ("nocommon", DECL_ATTRIBUTES (newdecl
)))
2883 DECL_COMMON (newdecl
) = DECL_COMMON (newdecl
) && DECL_COMMON (olddecl
);
2885 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
2886 But preserve OLDDECL's DECL_UID, DECL_CONTEXT and
2887 DECL_ARGUMENTS (if appropriate). */
2889 unsigned olddecl_uid
= DECL_UID (olddecl
);
2890 tree olddecl_context
= DECL_CONTEXT (olddecl
);
2891 tree olddecl_arguments
= NULL
;
2892 if (TREE_CODE (olddecl
) == FUNCTION_DECL
)
2893 olddecl_arguments
= DECL_ARGUMENTS (olddecl
);
2895 memcpy ((char *) olddecl
+ sizeof (struct tree_common
),
2896 (char *) newdecl
+ sizeof (struct tree_common
),
2897 sizeof (struct tree_decl_common
) - sizeof (struct tree_common
));
2898 DECL_USER_ALIGN (olddecl
) = DECL_USER_ALIGN (newdecl
);
2899 switch (TREE_CODE (olddecl
))
2904 struct symtab_node
*snode
= olddecl
->decl_with_vis
.symtab_node
;
2906 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
2907 (char *) newdecl
+ sizeof (struct tree_decl_common
),
2908 tree_code_size (TREE_CODE (olddecl
)) - sizeof (struct tree_decl_common
));
2909 olddecl
->decl_with_vis
.symtab_node
= snode
;
2911 if ((DECL_EXTERNAL (olddecl
)
2912 || TREE_PUBLIC (olddecl
)
2913 || TREE_STATIC (olddecl
))
2914 && DECL_SECTION_NAME (newdecl
) != NULL
)
2915 set_decl_section_name (olddecl
, newdecl
);
2917 /* This isn't quite correct for something like
2918 int __thread x attribute ((tls_model ("local-exec")));
2919 extern int __thread x;
2920 as we'll lose the "local-exec" model. */
2921 if (VAR_P (olddecl
) && DECL_THREAD_LOCAL_P (newdecl
))
2922 set_decl_tls_model (olddecl
, DECL_TLS_MODEL (newdecl
));
2932 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
2933 (char *) newdecl
+ sizeof (struct tree_decl_common
),
2934 tree_code_size (TREE_CODE (olddecl
)) - sizeof (struct tree_decl_common
));
2939 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
2940 (char *) newdecl
+ sizeof (struct tree_decl_common
),
2941 sizeof (struct tree_decl_non_common
) - sizeof (struct tree_decl_common
));
2943 DECL_UID (olddecl
) = olddecl_uid
;
2944 DECL_CONTEXT (olddecl
) = olddecl_context
;
2945 if (TREE_CODE (olddecl
) == FUNCTION_DECL
)
2946 DECL_ARGUMENTS (olddecl
) = olddecl_arguments
;
2949 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2950 so that encode_section_info has a chance to look at the new decl
2951 flags and attributes. */
2952 if (DECL_RTL_SET_P (olddecl
)
2953 && (TREE_CODE (olddecl
) == FUNCTION_DECL
2954 || (VAR_P (olddecl
) && TREE_STATIC (olddecl
))))
2955 make_decl_rtl (olddecl
);
2958 /* Handle when a new declaration NEWDECL has the same name as an old
2959 one OLDDECL in the same binding contour. Prints an error message
2962 If safely possible, alter OLDDECL to look like NEWDECL, and return
2963 true. Otherwise, return false. */
2966 duplicate_decls (tree newdecl
, tree olddecl
)
2968 tree newtype
= NULL
, oldtype
= NULL
;
2970 if (!diagnose_mismatched_decls (newdecl
, olddecl
, &newtype
, &oldtype
))
2972 /* Avoid `unused variable' and other warnings for OLDDECL. */
2973 suppress_warning (olddecl
, OPT_Wunused
);
2974 /* If the types are completely different, poison them both with
2976 if (TREE_CODE (TREE_TYPE (newdecl
)) != TREE_CODE (TREE_TYPE (olddecl
))
2977 && olddecl
!= error_mark_node
2980 if (TREE_CODE (olddecl
) != FUNCTION_DECL
)
2981 TREE_TYPE (olddecl
) = error_mark_node
;
2982 if (TREE_CODE (newdecl
) != FUNCTION_DECL
)
2983 TREE_TYPE (newdecl
) = error_mark_node
;
2988 merge_decls (newdecl
, olddecl
, newtype
, oldtype
);
2990 /* The NEWDECL will no longer be needed.
2992 Before releasing the node, be sure to remove function from symbol
2993 table that might have been inserted there to record comdat group.
2994 Be sure to however do not free DECL_STRUCT_FUNCTION because this
2995 structure is shared in between NEWDECL and OLDECL. */
2996 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2997 DECL_STRUCT_FUNCTION (newdecl
) = NULL
;
2998 if (VAR_OR_FUNCTION_DECL_P (newdecl
))
3000 struct symtab_node
*snode
= symtab_node::get (newdecl
);
3009 /* Check whether decl-node NEW_DECL shadows an existing declaration. */
3011 warn_if_shadowing (tree new_decl
)
3013 struct c_binding
*b
;
3015 /* Shadow warnings wanted? */
3017 || warn_shadow_local
3018 || warn_shadow_compatible_local
)
3019 /* No shadow warnings for internally generated vars. */
3020 || DECL_IS_UNDECLARED_BUILTIN (new_decl
))
3023 /* Is anything being shadowed? Invisible decls do not count. */
3024 for (b
= I_SYMBOL_BINDING (DECL_NAME (new_decl
)); b
; b
= b
->shadowed
)
3025 if (b
->decl
&& b
->decl
!= new_decl
&& !b
->invisible
3026 && (b
->decl
== error_mark_node
3027 || diagnostic_report_warnings_p (global_dc
,
3028 DECL_SOURCE_LOCATION (b
->decl
))))
3030 tree old_decl
= b
->decl
;
3032 if (old_decl
== error_mark_node
)
3034 warning (OPT_Wshadow
, "declaration of %q+D shadows previous "
3035 "non-variable", new_decl
);
3039 bool warned
= false;
3040 auto_diagnostic_group d
;
3041 if (TREE_CODE (old_decl
) == PARM_DECL
)
3043 enum opt_code warning_code
;
3045 /* If '-Wshadow=compatible-local' is specified without other
3046 -Wshadow= flags, we will warn only when the types of the
3047 shadowing variable (i.e. new_decl) and the shadowed variable
3048 (old_decl) are compatible. */
3050 warning_code
= OPT_Wshadow
;
3051 else if (comptypes (TREE_TYPE (old_decl
), TREE_TYPE (new_decl
)))
3052 warning_code
= OPT_Wshadow_compatible_local
;
3054 warning_code
= OPT_Wshadow_local
;
3055 warned
= warning_at (DECL_SOURCE_LOCATION (new_decl
), warning_code
,
3056 "declaration of %qD shadows a parameter",
3059 else if (DECL_FILE_SCOPE_P (old_decl
))
3061 /* Do not warn if a variable shadows a function, unless
3062 the variable is a function or a pointer-to-function. */
3063 if (TREE_CODE (old_decl
) == FUNCTION_DECL
3064 && TREE_CODE (new_decl
) != FUNCTION_DECL
3065 && !FUNCTION_POINTER_TYPE_P (TREE_TYPE (new_decl
)))
3068 warned
= warning_at (DECL_SOURCE_LOCATION (new_decl
), OPT_Wshadow
,
3069 "declaration of %qD shadows a global "
3073 else if (TREE_CODE (old_decl
) == FUNCTION_DECL
3074 && fndecl_built_in_p (old_decl
))
3076 warning (OPT_Wshadow
, "declaration of %q+D shadows "
3077 "a built-in function", new_decl
);
3082 enum opt_code warning_code
;
3084 /* If '-Wshadow=compatible-local' is specified without other
3085 -Wshadow= flags, we will warn only when the types of the
3086 shadowing variable (i.e. new_decl) and the shadowed variable
3087 (old_decl) are compatible. */
3089 warning_code
= OPT_Wshadow
;
3090 else if (comptypes (TREE_TYPE (old_decl
), TREE_TYPE (new_decl
)))
3091 warning_code
= OPT_Wshadow_compatible_local
;
3093 warning_code
= OPT_Wshadow_local
;
3094 warned
= warning_at (DECL_SOURCE_LOCATION (new_decl
), warning_code
,
3095 "declaration of %qD shadows a previous local",
3100 inform (DECL_SOURCE_LOCATION (old_decl
),
3101 "shadowed declaration is here");
3107 /* Record a decl-node X as belonging to the current lexical scope.
3108 Check for errors (such as an incompatible declaration for the same
3109 name already seen in the same scope).
3111 Returns either X or an old decl for the same name.
3112 If an old decl is returned, it may have been smashed
3113 to agree with what X says. */
3118 tree name
= DECL_NAME (x
);
3119 struct c_scope
*scope
= current_scope
;
3120 struct c_binding
*b
;
3121 bool nested
= false;
3122 location_t locus
= DECL_SOURCE_LOCATION (x
);
3124 /* Must set DECL_CONTEXT for everything not at file scope or
3125 DECL_FILE_SCOPE_P won't work. Local externs don't count
3126 unless they have initializers (which generate code). */
3127 if (current_function_decl
3128 && (!VAR_OR_FUNCTION_DECL_P (x
)
3129 || DECL_INITIAL (x
) || !TREE_PUBLIC (x
)))
3130 DECL_CONTEXT (x
) = current_function_decl
;
3132 /* Anonymous decls are just inserted in the scope. */
3135 bind (name
, x
, scope
, /*invisible=*/false, /*nested=*/false,
3140 /* First, see if there is another declaration with the same name in
3141 the current scope. If there is, duplicate_decls may do all the
3142 work for us. If duplicate_decls returns false, that indicates
3143 two incompatible decls in the same scope; we are to silently
3144 replace the old one (duplicate_decls has issued all appropriate
3145 diagnostics). In particular, we should not consider possible
3146 duplicates in the external scope, or shadowing. */
3147 b
= I_SYMBOL_BINDING (name
);
3148 if (b
&& B_IN_SCOPE (b
, scope
))
3150 struct c_binding
*b_ext
, *b_use
;
3151 tree type
= TREE_TYPE (x
);
3152 tree visdecl
= b
->decl
;
3153 tree vistype
= TREE_TYPE (visdecl
);
3154 if (TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
3155 && COMPLETE_TYPE_P (TREE_TYPE (x
)))
3156 b
->inner_comp
= false;
3159 /* If this is an external linkage declaration, we should check
3160 for compatibility with the type in the external scope before
3161 setting the type at this scope based on the visible
3162 information only. */
3163 if (TREE_PUBLIC (x
) && TREE_PUBLIC (visdecl
))
3165 while (b_ext
&& !B_IN_EXTERNAL_SCOPE (b_ext
))
3166 b_ext
= b_ext
->shadowed
;
3171 TREE_TYPE (b_use
->decl
) = b_use
->u
.type
;
3174 if (duplicate_decls (x
, b_use
->decl
))
3178 /* Save the updated type in the external scope and
3179 restore the proper type for this scope. */
3181 if (comptypes (vistype
, type
))
3182 thistype
= composite_type (vistype
, type
);
3184 thistype
= TREE_TYPE (b_use
->decl
);
3185 b_use
->u
.type
= TREE_TYPE (b_use
->decl
);
3186 if (TREE_CODE (b_use
->decl
) == FUNCTION_DECL
3187 && fndecl_built_in_p (b_use
->decl
))
3189 = build_type_attribute_variant (thistype
,
3192 TREE_TYPE (b_use
->decl
) = thistype
;
3197 goto skip_external_and_shadow_checks
;
3200 /* All declarations with external linkage, and all external
3201 references, go in the external scope, no matter what scope is
3202 current. However, the binding in that scope is ignored for
3203 purposes of normal name lookup. A separate binding structure is
3204 created in the requested scope; this governs the normal
3205 visibility of the symbol.
3207 The binding in the externals scope is used exclusively for
3208 detecting duplicate declarations of the same object, no matter
3209 what scope they are in; this is what we do here. (C99 6.2.7p2:
3210 All declarations that refer to the same object or function shall
3211 have compatible type; otherwise, the behavior is undefined.)
3212 However, in Objective-C, we also want to detect declarations
3213 conflicting with those of the basic types. */
3214 if ((DECL_EXTERNAL (x
) || scope
== file_scope
)
3215 && (VAR_OR_FUNCTION_DECL_P (x
) || c_dialect_objc ()))
3217 tree type
= TREE_TYPE (x
);
3218 tree vistype
= NULL_TREE
;
3219 tree visdecl
= NULL_TREE
;
3220 bool type_saved
= false;
3221 if (b
&& !B_IN_EXTERNAL_SCOPE (b
)
3222 && VAR_OR_FUNCTION_DECL_P (b
->decl
)
3223 && DECL_FILE_SCOPE_P (b
->decl
))
3226 vistype
= TREE_TYPE (visdecl
);
3228 if (scope
!= file_scope
3229 && !DECL_IN_SYSTEM_HEADER (x
))
3230 warning_at (locus
, OPT_Wnested_externs
,
3231 "nested extern declaration of %qD", x
);
3233 while (b
&& !B_IN_EXTERNAL_SCOPE (b
))
3235 /* If this decl might be modified, save its type. This is
3236 done here rather than when the decl is first bound
3237 because the type may change after first binding, through
3238 being completed or through attributes being added. If we
3239 encounter multiple such decls, only the first should have
3240 its type saved; the others will already have had their
3241 proper types saved and the types will not have changed as
3242 their scopes will not have been re-entered. */
3243 if (DECL_P (b
->decl
) && DECL_FILE_SCOPE_P (b
->decl
) && !type_saved
)
3245 b
->u
.type
= TREE_TYPE (b
->decl
);
3248 if (B_IN_FILE_SCOPE (b
)
3250 && TREE_STATIC (b
->decl
)
3251 && TREE_CODE (TREE_TYPE (b
->decl
)) == ARRAY_TYPE
3252 && !TYPE_DOMAIN (TREE_TYPE (b
->decl
))
3253 && TREE_CODE (type
) == ARRAY_TYPE
3254 && TYPE_DOMAIN (type
)
3255 && TYPE_MAX_VALUE (TYPE_DOMAIN (type
))
3256 && !integer_zerop (TYPE_MAX_VALUE (TYPE_DOMAIN (type
))))
3258 /* Array type completed in inner scope, which should be
3259 diagnosed if the completion does not have size 1 and
3260 it does not get completed in the file scope. */
3261 b
->inner_comp
= true;
3266 /* If a matching external declaration has been found, set its
3267 type to the composite of all the types of that declaration.
3268 After the consistency checks, it will be reset to the
3269 composite of the visible types only. */
3270 if (b
&& (TREE_PUBLIC (x
) || same_translation_unit_p (x
, b
->decl
))
3272 TREE_TYPE (b
->decl
) = b
->u
.type
;
3274 /* The point of the same_translation_unit_p check here is,
3275 we want to detect a duplicate decl for a construct like
3276 foo() { extern bar(); } ... static bar(); but not if
3277 they are in different translation units. In any case,
3278 the static does not go in the externals scope. */
3280 && (TREE_PUBLIC (x
) || same_translation_unit_p (x
, b
->decl
))
3281 && duplicate_decls (x
, b
->decl
))
3286 if (comptypes (vistype
, type
))
3287 thistype
= composite_type (vistype
, type
);
3289 thistype
= TREE_TYPE (b
->decl
);
3293 b
->u
.type
= TREE_TYPE (b
->decl
);
3294 /* Propagate the type attributes to the decl. */
3296 = build_type_attribute_variant (thistype
,
3297 TYPE_ATTRIBUTES (b
->u
.type
));
3298 TREE_TYPE (b
->decl
) = thistype
;
3299 bind (name
, b
->decl
, scope
, /*invisible=*/false, /*nested=*/true,
3303 else if (TREE_PUBLIC (x
))
3305 if (visdecl
&& !b
&& duplicate_decls (x
, visdecl
))
3307 /* An external declaration at block scope referring to a
3308 visible entity with internal linkage. The composite
3309 type will already be correct for this scope, so we
3310 just need to fall through to make the declaration in
3317 bind (name
, x
, external_scope
, /*invisible=*/true,
3318 /*nested=*/false, locus
);
3324 if (TREE_CODE (x
) != PARM_DECL
)
3325 warn_if_shadowing (x
);
3327 skip_external_and_shadow_checks
:
3328 if (TREE_CODE (x
) == TYPE_DECL
)
3330 /* So this is a typedef, set its underlying type. */
3331 set_underlying_type (x
);
3333 /* If X is a typedef defined in the current function, record it
3334 for the purpose of implementing the -Wunused-local-typedefs
3336 record_locally_defined_typedef (x
);
3339 bind (name
, x
, scope
, /*invisible=*/false, nested
, locus
);
3341 /* If x's type is incomplete because it's based on a
3342 structure or union which has not yet been fully declared,
3343 attach it to that structure or union type, so we can go
3344 back and complete the variable declaration later, if the
3345 structure or union gets fully declared.
3347 If the input is erroneous, we can have error_mark in the type
3348 slot (e.g. "f(void a, ...)") - that doesn't count as an
3350 if (TREE_TYPE (x
) != error_mark_node
3351 && !COMPLETE_TYPE_P (TREE_TYPE (x
)))
3353 tree element
= TREE_TYPE (x
);
3355 while (TREE_CODE (element
) == ARRAY_TYPE
)
3356 element
= TREE_TYPE (element
);
3357 element
= TYPE_MAIN_VARIANT (element
);
3359 if ((RECORD_OR_UNION_TYPE_P (element
)
3360 || TREE_CODE (element
) == ENUMERAL_TYPE
)
3361 && (TREE_CODE (x
) != TYPE_DECL
3362 || TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
)
3363 && !COMPLETE_TYPE_P (element
))
3364 C_TYPE_INCOMPLETE_VARS (element
)
3365 = tree_cons (NULL_TREE
, x
, C_TYPE_INCOMPLETE_VARS (element
));
3371 /* Issue a warning about implicit function declaration. ID is the function
3372 identifier, OLDDECL is a declaration of the function in a different scope,
3376 implicit_decl_warning (location_t loc
, tree id
, tree olddecl
)
3378 if (!warn_implicit_function_declaration
)
3382 auto_diagnostic_group d
;
3385 hint
= lookup_name_fuzzy (id
, FUZZY_LOOKUP_FUNCTION_NAME
, loc
);
3389 if (const char *suggestion
= hint
.suggestion ())
3391 gcc_rich_location
richloc (loc
);
3392 richloc
.add_fixit_replace (suggestion
);
3393 warned
= pedwarn (&richloc
, OPT_Wimplicit_function_declaration
,
3394 "implicit declaration of function %qE;"
3395 " did you mean %qs?",
3399 warned
= pedwarn (loc
, OPT_Wimplicit_function_declaration
,
3400 "implicit declaration of function %qE", id
);
3402 else if (const char *suggestion
= hint
.suggestion ())
3404 gcc_rich_location
richloc (loc
);
3405 richloc
.add_fixit_replace (suggestion
);
3407 (&richloc
, OPT_Wimplicit_function_declaration
,
3408 G_("implicit declaration of function %qE; did you mean %qs?"),
3412 warned
= warning_at (loc
, OPT_Wimplicit_function_declaration
,
3413 G_("implicit declaration of function %qE"), id
);
3417 /* Whether the olddecl is an undeclared builtin function.
3418 locate_old_decl will not generate a diagnostic for those,
3419 so in that case we want to look elsewhere. */
3420 bool undeclared_builtin
= (olddecl
3421 && TREE_CODE (olddecl
) == FUNCTION_DECL
3422 && fndecl_built_in_p (olddecl
)
3423 && !C_DECL_DECLARED_BUILTIN (olddecl
));
3424 if (undeclared_builtin
)
3426 const char *header
= header_for_builtin_fn (olddecl
);
3429 rich_location
richloc (line_table
, loc
);
3430 maybe_add_include_fixit (&richloc
, header
, true);
3432 "include %qs or provide a declaration of %qE",
3437 locate_old_decl (olddecl
);
3444 /* Return the name of the header file that declares built-in function
3445 FNDECL, or null if either we don't know or don't expect to see an
3446 explicit declaration. */
3449 header_for_builtin_fn (tree fndecl
)
3451 if (DECL_BUILT_IN_CLASS (fndecl
) != BUILT_IN_NORMAL
)
3454 switch (DECL_FUNCTION_CODE (fndecl
))
3456 CASE_FLT_FN (BUILT_IN_ACOS
):
3457 CASE_FLT_FN (BUILT_IN_ACOSH
):
3458 CASE_FLT_FN (BUILT_IN_ASIN
):
3459 CASE_FLT_FN (BUILT_IN_ASINH
):
3460 CASE_FLT_FN (BUILT_IN_ATAN
):
3461 CASE_FLT_FN (BUILT_IN_ATANH
):
3462 CASE_FLT_FN (BUILT_IN_ATAN2
):
3463 CASE_FLT_FN (BUILT_IN_CBRT
):
3464 CASE_FLT_FN (BUILT_IN_CEIL
):
3465 CASE_FLT_FN_FLOATN_NX (BUILT_IN_CEIL
):
3466 CASE_FLT_FN (BUILT_IN_COPYSIGN
):
3467 CASE_FLT_FN_FLOATN_NX (BUILT_IN_COPYSIGN
):
3468 CASE_FLT_FN (BUILT_IN_COS
):
3469 CASE_FLT_FN (BUILT_IN_COSH
):
3470 CASE_FLT_FN (BUILT_IN_ERF
):
3471 CASE_FLT_FN (BUILT_IN_ERFC
):
3472 CASE_FLT_FN (BUILT_IN_EXP
):
3473 CASE_FLT_FN (BUILT_IN_EXP2
):
3474 CASE_FLT_FN (BUILT_IN_EXPM1
):
3475 CASE_FLT_FN (BUILT_IN_FABS
):
3476 CASE_FLT_FN_FLOATN_NX (BUILT_IN_FABS
):
3477 CASE_FLT_FN (BUILT_IN_FDIM
):
3478 CASE_FLT_FN (BUILT_IN_FLOOR
):
3479 CASE_FLT_FN_FLOATN_NX (BUILT_IN_FLOOR
):
3480 CASE_FLT_FN (BUILT_IN_FMA
):
3481 CASE_FLT_FN_FLOATN_NX (BUILT_IN_FMA
):
3482 CASE_FLT_FN (BUILT_IN_FMAX
):
3483 CASE_FLT_FN_FLOATN_NX (BUILT_IN_FMAX
):
3484 CASE_FLT_FN (BUILT_IN_FMIN
):
3485 CASE_FLT_FN_FLOATN_NX (BUILT_IN_FMIN
):
3486 CASE_FLT_FN (BUILT_IN_FMOD
):
3487 CASE_FLT_FN (BUILT_IN_FREXP
):
3488 CASE_FLT_FN (BUILT_IN_HYPOT
):
3489 CASE_FLT_FN (BUILT_IN_ILOGB
):
3490 CASE_FLT_FN (BUILT_IN_LDEXP
):
3491 CASE_FLT_FN (BUILT_IN_LGAMMA
):
3492 CASE_FLT_FN (BUILT_IN_LLRINT
):
3493 CASE_FLT_FN (BUILT_IN_LLROUND
):
3494 CASE_FLT_FN (BUILT_IN_LOG
):
3495 CASE_FLT_FN (BUILT_IN_LOG10
):
3496 CASE_FLT_FN (BUILT_IN_LOG1P
):
3497 CASE_FLT_FN (BUILT_IN_LOG2
):
3498 CASE_FLT_FN (BUILT_IN_LOGB
):
3499 CASE_FLT_FN (BUILT_IN_LRINT
):
3500 CASE_FLT_FN (BUILT_IN_LROUND
):
3501 CASE_FLT_FN (BUILT_IN_MODF
):
3502 CASE_FLT_FN (BUILT_IN_NAN
):
3503 CASE_FLT_FN (BUILT_IN_NEARBYINT
):
3504 CASE_FLT_FN_FLOATN_NX (BUILT_IN_NEARBYINT
):
3505 CASE_FLT_FN (BUILT_IN_NEXTAFTER
):
3506 CASE_FLT_FN (BUILT_IN_NEXTTOWARD
):
3507 CASE_FLT_FN (BUILT_IN_POW
):
3508 CASE_FLT_FN (BUILT_IN_REMAINDER
):
3509 CASE_FLT_FN (BUILT_IN_REMQUO
):
3510 CASE_FLT_FN (BUILT_IN_RINT
):
3511 CASE_FLT_FN_FLOATN_NX (BUILT_IN_RINT
):
3512 CASE_FLT_FN (BUILT_IN_ROUND
):
3513 CASE_FLT_FN_FLOATN_NX (BUILT_IN_ROUND
):
3514 CASE_FLT_FN (BUILT_IN_SCALBLN
):
3515 CASE_FLT_FN (BUILT_IN_SCALBN
):
3516 CASE_FLT_FN (BUILT_IN_SIN
):
3517 CASE_FLT_FN (BUILT_IN_SINH
):
3518 CASE_FLT_FN (BUILT_IN_SINCOS
):
3519 CASE_FLT_FN (BUILT_IN_SQRT
):
3520 CASE_FLT_FN_FLOATN_NX (BUILT_IN_SQRT
):
3521 CASE_FLT_FN (BUILT_IN_TAN
):
3522 CASE_FLT_FN (BUILT_IN_TANH
):
3523 CASE_FLT_FN (BUILT_IN_TGAMMA
):
3524 CASE_FLT_FN (BUILT_IN_TRUNC
):
3525 CASE_FLT_FN_FLOATN_NX (BUILT_IN_TRUNC
):
3526 case BUILT_IN_ISINF
:
3527 case BUILT_IN_ISNAN
:
3529 CASE_FLT_FN (BUILT_IN_CABS
):
3530 CASE_FLT_FN (BUILT_IN_CACOS
):
3531 CASE_FLT_FN (BUILT_IN_CACOSH
):
3532 CASE_FLT_FN (BUILT_IN_CARG
):
3533 CASE_FLT_FN (BUILT_IN_CASIN
):
3534 CASE_FLT_FN (BUILT_IN_CASINH
):
3535 CASE_FLT_FN (BUILT_IN_CATAN
):
3536 CASE_FLT_FN (BUILT_IN_CATANH
):
3537 CASE_FLT_FN (BUILT_IN_CCOS
):
3538 CASE_FLT_FN (BUILT_IN_CCOSH
):
3539 CASE_FLT_FN (BUILT_IN_CEXP
):
3540 CASE_FLT_FN (BUILT_IN_CIMAG
):
3541 CASE_FLT_FN (BUILT_IN_CLOG
):
3542 CASE_FLT_FN (BUILT_IN_CONJ
):
3543 CASE_FLT_FN (BUILT_IN_CPOW
):
3544 CASE_FLT_FN (BUILT_IN_CPROJ
):
3545 CASE_FLT_FN (BUILT_IN_CREAL
):
3546 CASE_FLT_FN (BUILT_IN_CSIN
):
3547 CASE_FLT_FN (BUILT_IN_CSINH
):
3548 CASE_FLT_FN (BUILT_IN_CSQRT
):
3549 CASE_FLT_FN (BUILT_IN_CTAN
):
3550 CASE_FLT_FN (BUILT_IN_CTANH
):
3551 return "<complex.h>";
3552 case BUILT_IN_MEMCHR
:
3553 case BUILT_IN_MEMCMP
:
3554 case BUILT_IN_MEMCPY
:
3555 case BUILT_IN_MEMMOVE
:
3556 case BUILT_IN_MEMSET
:
3557 case BUILT_IN_STRCAT
:
3558 case BUILT_IN_STRCHR
:
3559 case BUILT_IN_STRCMP
:
3560 case BUILT_IN_STRCPY
:
3561 case BUILT_IN_STRCSPN
:
3562 case BUILT_IN_STRLEN
:
3563 case BUILT_IN_STRNCAT
:
3564 case BUILT_IN_STRNCMP
:
3565 case BUILT_IN_STRNCPY
:
3566 case BUILT_IN_STRPBRK
:
3567 case BUILT_IN_STRRCHR
:
3568 case BUILT_IN_STRSPN
:
3569 case BUILT_IN_STRSTR
:
3570 return "<string.h>";
3571 case BUILT_IN_FPRINTF
:
3573 case BUILT_IN_FPUTC
:
3574 case BUILT_IN_FPUTS
:
3575 case BUILT_IN_FSCANF
:
3576 case BUILT_IN_FWRITE
:
3577 case BUILT_IN_PRINTF
:
3578 case BUILT_IN_PUTCHAR
:
3580 case BUILT_IN_SCANF
:
3581 case BUILT_IN_SNPRINTF
:
3582 case BUILT_IN_SPRINTF
:
3583 case BUILT_IN_SSCANF
:
3584 case BUILT_IN_VFPRINTF
:
3585 case BUILT_IN_VFSCANF
:
3586 case BUILT_IN_VPRINTF
:
3587 case BUILT_IN_VSCANF
:
3588 case BUILT_IN_VSNPRINTF
:
3589 case BUILT_IN_VSPRINTF
:
3590 case BUILT_IN_VSSCANF
:
3592 case BUILT_IN_ISALNUM
:
3593 case BUILT_IN_ISALPHA
:
3594 case BUILT_IN_ISBLANK
:
3595 case BUILT_IN_ISCNTRL
:
3596 case BUILT_IN_ISDIGIT
:
3597 case BUILT_IN_ISGRAPH
:
3598 case BUILT_IN_ISLOWER
:
3599 case BUILT_IN_ISPRINT
:
3600 case BUILT_IN_ISPUNCT
:
3601 case BUILT_IN_ISSPACE
:
3602 case BUILT_IN_ISUPPER
:
3603 case BUILT_IN_ISXDIGIT
:
3604 case BUILT_IN_TOLOWER
:
3605 case BUILT_IN_TOUPPER
:
3607 case BUILT_IN_ISWALNUM
:
3608 case BUILT_IN_ISWALPHA
:
3609 case BUILT_IN_ISWBLANK
:
3610 case BUILT_IN_ISWCNTRL
:
3611 case BUILT_IN_ISWDIGIT
:
3612 case BUILT_IN_ISWGRAPH
:
3613 case BUILT_IN_ISWLOWER
:
3614 case BUILT_IN_ISWPRINT
:
3615 case BUILT_IN_ISWPUNCT
:
3616 case BUILT_IN_ISWSPACE
:
3617 case BUILT_IN_ISWUPPER
:
3618 case BUILT_IN_ISWXDIGIT
:
3619 case BUILT_IN_TOWLOWER
:
3620 case BUILT_IN_TOWUPPER
:
3621 return "<wctype.h>";
3622 case BUILT_IN_ABORT
:
3624 case BUILT_IN_CALLOC
:
3628 case BUILT_IN_LLABS
:
3629 case BUILT_IN_MALLOC
:
3630 case BUILT_IN_REALLOC
:
3631 case BUILT_IN__EXIT2
:
3632 case BUILT_IN_ALIGNED_ALLOC
:
3633 return "<stdlib.h>";
3634 case BUILT_IN_IMAXABS
:
3635 return "<inttypes.h>";
3636 case BUILT_IN_STRFTIME
:
3643 /* Generate an implicit declaration for identifier FUNCTIONID at LOC as a
3644 function of type int (). */
3647 implicitly_declare (location_t loc
, tree functionid
)
3649 struct c_binding
*b
;
3650 tree decl
= NULL_TREE
;
3653 for (b
= I_SYMBOL_BINDING (functionid
); b
; b
= b
->shadowed
)
3655 if (B_IN_SCOPE (b
, external_scope
))
3664 if (TREE_CODE (decl
) != FUNCTION_DECL
)
3667 /* FIXME: Objective-C has weird not-really-builtin functions
3668 which are supposed to be visible automatically. They wind up
3669 in the external scope because they're pushed before the file
3670 scope gets created. Catch this here and rebind them into the
3672 if (!fndecl_built_in_p (decl
) && DECL_IS_UNDECLARED_BUILTIN (decl
))
3674 bind (functionid
, decl
, file_scope
,
3675 /*invisible=*/false, /*nested=*/true,
3676 DECL_SOURCE_LOCATION (decl
));
3681 tree newtype
= default_function_type
;
3683 TREE_TYPE (decl
) = b
->u
.type
;
3684 /* Implicit declaration of a function already declared
3685 (somehow) in a different scope, or as a built-in.
3686 If this is the first time this has happened, warn;
3687 then recycle the old declaration but with the new type. */
3688 if (!C_DECL_IMPLICIT (decl
))
3690 implicit_decl_warning (loc
, functionid
, decl
);
3691 C_DECL_IMPLICIT (decl
) = 1;
3693 if (fndecl_built_in_p (decl
))
3695 newtype
= build_type_attribute_variant (newtype
,
3697 (TREE_TYPE (decl
)));
3698 if (!comptypes (newtype
, TREE_TYPE (decl
)))
3700 auto_diagnostic_group d
;
3701 bool warned
= warning_at (loc
,
3702 OPT_Wbuiltin_declaration_mismatch
,
3703 "incompatible implicit "
3704 "declaration of built-in "
3705 "function %qD", decl
);
3706 /* See if we can hint which header to include. */
3707 const char *header
= header_for_builtin_fn (decl
);
3708 if (header
!= NULL
&& warned
)
3710 rich_location
richloc (line_table
, loc
);
3711 maybe_add_include_fixit (&richloc
, header
, true);
3713 "include %qs or provide a declaration of %qD",
3716 newtype
= TREE_TYPE (decl
);
3721 if (!comptypes (newtype
, TREE_TYPE (decl
)))
3723 auto_diagnostic_group d
;
3724 error_at (loc
, "incompatible implicit declaration of "
3725 "function %qD", decl
);
3726 locate_old_decl (decl
);
3729 b
->u
.type
= TREE_TYPE (decl
);
3730 TREE_TYPE (decl
) = newtype
;
3731 bind (functionid
, decl
, current_scope
,
3732 /*invisible=*/false, /*nested=*/true,
3733 DECL_SOURCE_LOCATION (decl
));
3738 /* Not seen before. */
3739 decl
= build_decl (loc
, FUNCTION_DECL
, functionid
, default_function_type
);
3740 DECL_EXTERNAL (decl
) = 1;
3741 TREE_PUBLIC (decl
) = 1;
3742 C_DECL_IMPLICIT (decl
) = 1;
3743 implicit_decl_warning (loc
, functionid
, 0);
3744 asmspec_tree
= maybe_apply_renaming_pragma (decl
, /*asmname=*/NULL
);
3746 set_user_assembler_name (decl
, TREE_STRING_POINTER (asmspec_tree
));
3748 /* C89 says implicit declarations are in the innermost block.
3749 So we record the decl in the standard fashion. */
3750 decl
= pushdecl (decl
);
3752 /* No need to call objc_check_decl here - it's a function type. */
3753 rest_of_decl_compilation (decl
, 0, 0);
3755 /* Write a record describing this implicit function declaration
3756 to the prototypes file (if requested). */
3757 gen_aux_info_record (decl
, 0, 1, 0);
3759 /* Possibly apply some default attributes to this implicit declaration. */
3760 decl_attributes (&decl
, NULL_TREE
, 0);
3765 /* Issue an error message for a reference to an undeclared variable
3766 ID, including a reference to a builtin outside of function-call
3767 context. Establish a binding of the identifier to error_mark_node
3768 in an appropriate scope, which will suppress further errors for the
3769 same identifier. The error message should be given location LOC. */
3771 undeclared_variable (location_t loc
, tree id
)
3773 static bool already
= false;
3774 struct c_scope
*scope
;
3776 auto_diagnostic_group d
;
3777 if (current_function_decl
== NULL_TREE
)
3779 name_hint guessed_id
= lookup_name_fuzzy (id
, FUZZY_LOOKUP_NAME
, loc
);
3780 if (const char *suggestion
= guessed_id
.suggestion ())
3782 gcc_rich_location
richloc (loc
);
3783 richloc
.add_fixit_replace (suggestion
);
3785 "%qE undeclared here (not in a function);"
3786 " did you mean %qs?",
3790 error_at (loc
, "%qE undeclared here (not in a function)", id
);
3791 scope
= current_scope
;
3795 if (!objc_diagnose_private_ivar (id
))
3797 name_hint guessed_id
= lookup_name_fuzzy (id
, FUZZY_LOOKUP_NAME
, loc
);
3798 if (const char *suggestion
= guessed_id
.suggestion ())
3800 gcc_rich_location
richloc (loc
);
3801 richloc
.add_fixit_replace (suggestion
);
3803 "%qE undeclared (first use in this function);"
3804 " did you mean %qs?",
3808 error_at (loc
, "%qE undeclared (first use in this function)", id
);
3812 inform (loc
, "each undeclared identifier is reported only"
3813 " once for each function it appears in");
3817 /* If we are parsing old-style parameter decls, current_function_decl
3818 will be nonnull but current_function_scope will be null. */
3819 scope
= current_function_scope
? current_function_scope
: current_scope
;
3821 bind (id
, error_mark_node
, scope
, /*invisible=*/false, /*nested=*/false,
3825 /* Subroutine of lookup_label, declare_label, define_label: construct a
3826 LABEL_DECL with all the proper frills. Also create a struct
3827 c_label_vars initialized for the current scope. */
3830 make_label (location_t location
, tree name
, bool defining
,
3831 struct c_label_vars
**p_label_vars
)
3833 tree label
= build_decl (location
, LABEL_DECL
, name
, void_type_node
);
3834 DECL_CONTEXT (label
) = current_function_decl
;
3835 SET_DECL_MODE (label
, VOIDmode
);
3837 c_label_vars
*label_vars
= ggc_alloc
<c_label_vars
> ();
3838 label_vars
->shadowed
= NULL
;
3839 set_spot_bindings (&label_vars
->label_bindings
, defining
);
3840 label_vars
->decls_in_scope
= make_tree_vector ();
3841 label_vars
->gotos
= NULL
;
3842 *p_label_vars
= label_vars
;
3847 /* Get the LABEL_DECL corresponding to identifier NAME as a label.
3848 Create one if none exists so far for the current function.
3849 This is called when a label is used in a goto expression or
3850 has its address taken. */
3853 lookup_label (tree name
)
3856 struct c_label_vars
*label_vars
;
3858 if (current_function_scope
== 0)
3860 error ("label %qE referenced outside of any function", name
);
3864 /* Use a label already defined or ref'd with this name, but not if
3865 it is inherited from a containing function and wasn't declared
3867 label
= I_LABEL_DECL (name
);
3868 if (label
&& (DECL_CONTEXT (label
) == current_function_decl
3869 || C_DECLARED_LABEL_FLAG (label
)))
3871 /* If the label has only been declared, update its apparent
3872 location to point here, for better diagnostics if it
3873 turns out not to have been defined. */
3874 if (DECL_INITIAL (label
) == NULL_TREE
)
3875 DECL_SOURCE_LOCATION (label
) = input_location
;
3879 /* No label binding for that identifier; make one. */
3880 label
= make_label (input_location
, name
, false, &label_vars
);
3882 /* Ordinary labels go in the current function scope. */
3883 bind_label (name
, label
, current_function_scope
, label_vars
);
3888 /* Issue a warning about DECL for a goto statement at GOTO_LOC going
3892 warn_about_goto (location_t goto_loc
, tree label
, tree decl
)
3894 auto_diagnostic_group d
;
3895 if (variably_modified_type_p (TREE_TYPE (decl
), NULL_TREE
))
3897 "jump into scope of identifier with variably modified type");
3899 if (!warning_at (goto_loc
, OPT_Wjump_misses_init
,
3900 "jump skips variable initialization"))
3902 inform (DECL_SOURCE_LOCATION (label
), "label %qD defined here", label
);
3903 inform (DECL_SOURCE_LOCATION (decl
), "%qD declared here", decl
);
3906 /* Look up a label because of a goto statement. This is like
3907 lookup_label, but also issues any appropriate warnings. */
3910 lookup_label_for_goto (location_t loc
, tree name
)
3913 struct c_label_vars
*label_vars
;
3917 label
= lookup_label (name
);
3918 if (label
== NULL_TREE
)
3921 /* If we are jumping to a different function, we can't issue any
3923 if (DECL_CONTEXT (label
) != current_function_decl
)
3925 gcc_assert (C_DECLARED_LABEL_FLAG (label
));
3929 label_vars
= I_LABEL_BINDING (name
)->u
.label
;
3931 /* If the label has not yet been defined, then push this goto on a
3932 list for possible later warnings. */
3933 if (label_vars
->label_bindings
.scope
== NULL
)
3935 c_goto_bindings
*g
= ggc_alloc
<c_goto_bindings
> ();
3938 set_spot_bindings (&g
->goto_bindings
, true);
3939 vec_safe_push (label_vars
->gotos
, g
);
3943 /* If there are any decls in label_vars->decls_in_scope, then this
3944 goto has missed the declaration of the decl. This happens for a
3950 Issue a warning or error. */
3951 FOR_EACH_VEC_SAFE_ELT (label_vars
->decls_in_scope
, ix
, decl
)
3952 warn_about_goto (loc
, label
, decl
);
3954 if (label_vars
->label_bindings
.left_stmt_expr
)
3956 auto_diagnostic_group d
;
3957 error_at (loc
, "jump into statement expression");
3958 inform (DECL_SOURCE_LOCATION (label
), "label %qD defined here", label
);
3964 /* Make a label named NAME in the current function, shadowing silently
3965 any that may be inherited from containing functions or containing
3966 scopes. This is called for __label__ declarations. */
3969 declare_label (tree name
)
3971 struct c_binding
*b
= I_LABEL_BINDING (name
);
3973 struct c_label_vars
*label_vars
;
3975 /* Check to make sure that the label hasn't already been declared
3977 if (b
&& B_IN_CURRENT_SCOPE (b
))
3979 auto_diagnostic_group d
;
3980 error ("duplicate label declaration %qE", name
);
3981 locate_old_decl (b
->decl
);
3983 /* Just use the previous declaration. */
3987 label
= make_label (input_location
, name
, false, &label_vars
);
3988 C_DECLARED_LABEL_FLAG (label
) = 1;
3990 /* Declared labels go in the current scope. */
3991 bind_label (name
, label
, current_scope
, label_vars
);
3996 /* When we define a label, issue any appropriate warnings if there are
3997 any gotos earlier in the function which jump to this label. */
4000 check_earlier_gotos (tree label
, struct c_label_vars
* label_vars
)
4003 struct c_goto_bindings
*g
;
4005 FOR_EACH_VEC_SAFE_ELT (label_vars
->gotos
, ix
, g
)
4007 struct c_binding
*b
;
4008 struct c_scope
*scope
;
4010 /* We have a goto to this label. The goto is going forward. In
4011 g->scope, the goto is going to skip any binding which was
4012 defined after g->bindings_in_scope. */
4013 if (g
->goto_bindings
.scope
->has_jump_unsafe_decl
)
4015 for (b
= g
->goto_bindings
.scope
->bindings
;
4016 b
!= g
->goto_bindings
.bindings_in_scope
;
4019 if (decl_jump_unsafe (b
->decl
))
4020 warn_about_goto (g
->loc
, label
, b
->decl
);
4024 /* We also need to warn about decls defined in any scopes
4025 between the scope of the label and the scope of the goto. */
4026 for (scope
= label_vars
->label_bindings
.scope
;
4027 scope
!= g
->goto_bindings
.scope
;
4028 scope
= scope
->outer
)
4030 gcc_assert (scope
!= NULL
);
4031 if (scope
->has_jump_unsafe_decl
)
4033 if (scope
== label_vars
->label_bindings
.scope
)
4034 b
= label_vars
->label_bindings
.bindings_in_scope
;
4036 b
= scope
->bindings
;
4037 for (; b
!= NULL
; b
= b
->prev
)
4039 if (decl_jump_unsafe (b
->decl
))
4040 warn_about_goto (g
->loc
, label
, b
->decl
);
4045 if (g
->goto_bindings
.stmt_exprs
> 0)
4047 auto_diagnostic_group d
;
4048 error_at (g
->loc
, "jump into statement expression");
4049 inform (DECL_SOURCE_LOCATION (label
), "label %qD defined here",
4054 /* Now that the label is defined, we will issue warnings about
4055 subsequent gotos to this label when we see them. */
4056 vec_safe_truncate (label_vars
->gotos
, 0);
4057 label_vars
->gotos
= NULL
;
4060 /* Define a label, specifying the location in the source file.
4061 Return the LABEL_DECL node for the label, if the definition is valid.
4062 Otherwise return NULL_TREE. */
4065 define_label (location_t location
, tree name
)
4067 /* Find any preexisting label with this name. It is an error
4068 if that label has already been defined in this function, or
4069 if there is a containing function with a declared label with
4071 tree label
= I_LABEL_DECL (name
);
4074 && ((DECL_CONTEXT (label
) == current_function_decl
4075 && DECL_INITIAL (label
) != NULL_TREE
)
4076 || (DECL_CONTEXT (label
) != current_function_decl
4077 && C_DECLARED_LABEL_FLAG (label
))))
4079 auto_diagnostic_group d
;
4080 error_at (location
, "duplicate label %qD", label
);
4081 locate_old_decl (label
);
4084 else if (label
&& DECL_CONTEXT (label
) == current_function_decl
)
4086 struct c_label_vars
*label_vars
= I_LABEL_BINDING (name
)->u
.label
;
4088 /* The label has been used or declared already in this function,
4089 but not defined. Update its location to point to this
4091 DECL_SOURCE_LOCATION (label
) = location
;
4092 set_spot_bindings (&label_vars
->label_bindings
, true);
4094 /* Issue warnings as required about any goto statements from
4095 earlier in the function. */
4096 check_earlier_gotos (label
, label_vars
);
4100 struct c_label_vars
*label_vars
;
4102 /* No label binding for that identifier; make one. */
4103 label
= make_label (location
, name
, true, &label_vars
);
4105 /* Ordinary labels go in the current function scope. */
4106 bind_label (name
, label
, current_function_scope
, label_vars
);
4109 if (!in_system_header_at (input_location
) && lookup_name (name
))
4110 warning_at (location
, OPT_Wtraditional
,
4111 "traditional C lacks a separate namespace "
4112 "for labels, identifier %qE conflicts", name
);
4114 /* Mark label as having been defined. */
4115 DECL_INITIAL (label
) = error_mark_node
;
4119 /* Get the bindings for a new switch statement. This is used to issue
4120 warnings as appropriate for jumps from the switch to case or
4123 struct c_spot_bindings
*
4124 c_get_switch_bindings (void)
4126 struct c_spot_bindings
*switch_bindings
;
4128 switch_bindings
= XNEW (struct c_spot_bindings
);
4129 set_spot_bindings (switch_bindings
, true);
4130 return switch_bindings
;
4134 c_release_switch_bindings (struct c_spot_bindings
*bindings
)
4136 gcc_assert (bindings
->stmt_exprs
== 0 && !bindings
->left_stmt_expr
);
4140 /* This is called at the point of a case or default label to issue
4141 warnings about decls as needed. It returns true if it found an
4142 error, not just a warning. */
4145 c_check_switch_jump_warnings (struct c_spot_bindings
*switch_bindings
,
4146 location_t switch_loc
, location_t case_loc
)
4149 struct c_scope
*scope
;
4152 for (scope
= current_scope
;
4153 scope
!= switch_bindings
->scope
;
4154 scope
= scope
->outer
)
4156 struct c_binding
*b
;
4158 gcc_assert (scope
!= NULL
);
4160 if (!scope
->has_jump_unsafe_decl
)
4163 for (b
= scope
->bindings
; b
!= NULL
; b
= b
->prev
)
4165 if (decl_jump_unsafe (b
->decl
))
4167 auto_diagnostic_group d
;
4169 if (variably_modified_type_p (TREE_TYPE (b
->decl
), NULL_TREE
))
4173 ("switch jumps into scope of identifier with "
4174 "variably modified type"));
4179 = warning_at (case_loc
, OPT_Wjump_misses_init
,
4180 "switch jumps over variable initialization");
4183 inform (switch_loc
, "switch starts here");
4184 inform (DECL_SOURCE_LOCATION (b
->decl
), "%qD declared here",
4191 if (switch_bindings
->stmt_exprs
> 0)
4194 auto_diagnostic_group d
;
4195 error_at (case_loc
, "switch jumps into statement expression");
4196 inform (switch_loc
, "switch starts here");
4202 /* Given NAME, an IDENTIFIER_NODE,
4203 return the structure (or union or enum) definition for that name.
4204 If THISLEVEL_ONLY is nonzero, searches only the current_scope.
4205 CODE says which kind of type the caller wants;
4206 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
4207 If PLOC is not NULL and this returns non-null, it sets *PLOC to the
4208 location where the tag was defined.
4209 If the wrong kind of type is found, an error is reported. */
4212 lookup_tag (enum tree_code code
, tree name
, bool thislevel_only
,
4215 struct c_binding
*b
= I_TAG_BINDING (name
);
4216 bool thislevel
= false;
4221 /* We only care about whether it's in this level if
4222 thislevel_only was set or it might be a type clash. */
4223 if (thislevel_only
|| TREE_CODE (b
->decl
) != code
)
4225 /* For our purposes, a tag in the external scope is the same as
4226 a tag in the file scope. (Primarily relevant to Objective-C
4227 and its builtin structure tags, which get pushed before the
4228 file scope is created.) */
4229 if (B_IN_CURRENT_SCOPE (b
)
4230 || (current_scope
== file_scope
&& B_IN_EXTERNAL_SCOPE (b
)))
4234 if (thislevel_only
&& !thislevel
)
4237 if (TREE_CODE (b
->decl
) != code
)
4239 /* Definition isn't the kind we were looking for. */
4240 pending_invalid_xref
= name
;
4241 pending_invalid_xref_location
= input_location
;
4243 /* If in the same binding level as a declaration as a tag
4244 of a different type, this must not be allowed to
4245 shadow that tag, so give the error immediately.
4246 (For example, "struct foo; union foo;" is invalid.) */
4248 pending_xref_error ();
4257 /* Return true if a definition exists for NAME with code CODE. */
4260 tag_exists_p (enum tree_code code
, tree name
)
4262 struct c_binding
*b
= I_TAG_BINDING (name
);
4264 if (b
== NULL
|| b
->decl
== NULL_TREE
)
4266 return TREE_CODE (b
->decl
) == code
;
4269 /* Print an error message now
4270 for a recent invalid struct, union or enum cross reference.
4271 We don't print them immediately because they are not invalid
4272 when used in the `struct foo;' construct for shadowing. */
4275 pending_xref_error (void)
4277 if (pending_invalid_xref
!= NULL_TREE
)
4278 error_at (pending_invalid_xref_location
, "%qE defined as wrong kind of tag",
4279 pending_invalid_xref
);
4280 pending_invalid_xref
= NULL_TREE
;
4284 /* Look up NAME in the current scope and its superiors
4285 in the namespace of variables, functions and typedefs.
4286 Return a ..._DECL node of some kind representing its definition,
4287 or return NULL_TREE if it is undefined. */
4290 lookup_name (tree name
)
4292 struct c_binding
*b
= I_SYMBOL_BINDING (name
);
4293 if (b
&& !b
->invisible
)
4295 maybe_record_typedef_use (b
->decl
);
4301 /* Similar to `lookup_name' but look only at the indicated scope. */
4304 lookup_name_in_scope (tree name
, struct c_scope
*scope
)
4306 struct c_binding
*b
;
4308 for (b
= I_SYMBOL_BINDING (name
); b
; b
= b
->shadowed
)
4309 if (B_IN_SCOPE (b
, scope
))
4314 /* Look for the closest match for NAME within the currently valid
4317 This finds the identifier with the lowest Levenshtein distance to
4318 NAME. If there are multiple candidates with equal minimal distance,
4319 the first one found is returned. Scopes are searched from innermost
4320 outwards, and within a scope in reverse order of declaration, thus
4321 benefiting candidates "near" to the current scope.
4323 The function also looks for similar macro names to NAME, since a
4324 misspelled macro name will not be expanded, and hence looks like an
4325 identifier to the C frontend.
4327 It also looks for start_typename keywords, to detect "singed" vs "signed"
4330 Use LOC for any deferred diagnostics. */
4333 lookup_name_fuzzy (tree name
, enum lookup_name_fuzzy_kind kind
, location_t loc
)
4335 gcc_assert (TREE_CODE (name
) == IDENTIFIER_NODE
);
4337 /* First, try some well-known names in the C standard library, in case
4338 the user forgot a #include. */
4339 const char *header_hint
4340 = get_c_stdlib_header_for_name (IDENTIFIER_POINTER (name
));
4343 return name_hint (NULL
,
4344 new suggest_missing_header (loc
,
4345 IDENTIFIER_POINTER (name
),
4348 /* Only suggest names reserved for the implementation if NAME begins
4349 with an underscore. */
4350 bool consider_implementation_names
= (IDENTIFIER_POINTER (name
)[0] == '_');
4352 best_match
<tree
, tree
> bm (name
);
4354 /* Look within currently valid scopes. */
4355 for (c_scope
*scope
= current_scope
; scope
; scope
= scope
->outer
)
4356 for (c_binding
*binding
= scope
->bindings
; binding
; binding
= binding
->prev
)
4358 if (!binding
->id
|| binding
->invisible
)
4360 if (binding
->decl
== error_mark_node
)
4362 /* Don't use bindings from implicitly declared functions,
4363 as they were likely misspellings themselves. */
4364 if (TREE_CODE (binding
->decl
) == FUNCTION_DECL
)
4365 if (C_DECL_IMPLICIT (binding
->decl
))
4367 /* Don't suggest names that are reserved for use by the
4368 implementation, unless NAME began with an underscore. */
4369 if (!consider_implementation_names
)
4371 const char *suggestion_str
= IDENTIFIER_POINTER (binding
->id
);
4372 if (name_reserved_for_implementation_p (suggestion_str
))
4377 case FUZZY_LOOKUP_TYPENAME
:
4378 if (TREE_CODE (binding
->decl
) != TYPE_DECL
)
4382 case FUZZY_LOOKUP_FUNCTION_NAME
:
4383 if (TREE_CODE (binding
->decl
) != FUNCTION_DECL
)
4385 /* Allow function pointers. */
4386 if ((VAR_P (binding
->decl
)
4387 || TREE_CODE (binding
->decl
) == PARM_DECL
)
4388 && TREE_CODE (TREE_TYPE (binding
->decl
)) == POINTER_TYPE
4389 && (TREE_CODE (TREE_TYPE (TREE_TYPE (binding
->decl
)))
4399 bm
.consider (binding
->id
);
4402 /* Consider macros: if the user misspelled a macro name e.g. "SOME_MACRO"
4404 x = SOME_OTHER_MACRO (y);
4405 then "SOME_OTHER_MACRO" will survive to the frontend and show up
4406 as a misspelled identifier.
4408 Use the best distance so far so that a candidate is only set if
4409 a macro is better than anything so far. This allows early rejection
4410 (without calculating the edit distance) of macro names that must have
4411 distance >= bm.get_best_distance (), and means that we only get a
4412 non-NULL result for best_macro_match if it's better than any of
4413 the identifiers already checked, which avoids needless creation
4414 of identifiers for macro hashnodes. */
4415 best_macro_match
bmm (name
, bm
.get_best_distance (), parse_in
);
4416 cpp_hashnode
*best_macro
= bmm
.get_best_meaningful_candidate ();
4417 /* If a macro is the closest so far to NAME, use it, creating an
4418 identifier tree node for it. */
4421 const char *id
= (const char *)best_macro
->ident
.str
;
4422 tree macro_as_identifier
4423 = get_identifier_with_length (id
, best_macro
->ident
.len
);
4424 bm
.set_best_so_far (macro_as_identifier
,
4425 bmm
.get_best_distance (),
4426 bmm
.get_best_candidate_length ());
4429 /* Try the "start_typename" keywords to detect
4430 "singed" vs "signed" typos. */
4431 if (kind
== FUZZY_LOOKUP_TYPENAME
)
4433 for (unsigned i
= 0; i
< num_c_common_reswords
; i
++)
4435 const c_common_resword
*resword
= &c_common_reswords
[i
];
4436 if (!c_keyword_starts_typename (resword
->rid
))
4438 tree resword_identifier
= ridpointers
[resword
->rid
];
4439 if (!resword_identifier
)
4441 gcc_assert (TREE_CODE (resword_identifier
) == IDENTIFIER_NODE
);
4442 bm
.consider (resword_identifier
);
4446 tree best
= bm
.get_best_meaningful_candidate ();
4448 return name_hint (IDENTIFIER_POINTER (best
), NULL
);
4450 return name_hint (NULL
, NULL
);
4454 /* Handle the standard [[nodiscard]] attribute. */
4457 handle_nodiscard_attribute (tree
*node
, tree name
, tree
/*args*/,
4458 int /*flags*/, bool *no_add_attrs
)
4460 if (TREE_CODE (*node
) == FUNCTION_DECL
)
4462 if (VOID_TYPE_P (TREE_TYPE (TREE_TYPE (*node
))))
4463 warning_at (DECL_SOURCE_LOCATION (*node
),
4464 OPT_Wattributes
, "%qE attribute applied to %qD with void "
4465 "return type", name
, *node
);
4467 else if (RECORD_OR_UNION_TYPE_P (*node
)
4468 || TREE_CODE (*node
) == ENUMERAL_TYPE
)
4472 pedwarn (input_location
,
4473 OPT_Wattributes
, "%qE attribute can only be applied to "
4474 "functions or to structure, union or enumeration types", name
);
4475 *no_add_attrs
= true;
4479 /* Table of supported standard (C2x) attributes. */
4480 const struct attribute_spec std_attribute_table
[] =
4482 /* { name, min_len, max_len, decl_req, type_req, fn_type_req,
4483 affects_type_identity, handler, exclude } */
4484 { "deprecated", 0, 1, false, false, false, false,
4485 handle_deprecated_attribute
, NULL
},
4486 { "fallthrough", 0, 0, false, false, false, false,
4487 handle_fallthrough_attribute
, NULL
},
4488 { "maybe_unused", 0, 0, false, false, false, false,
4489 handle_unused_attribute
, NULL
},
4490 { "nodiscard", 0, 1, false, false, false, false,
4491 handle_nodiscard_attribute
, NULL
},
4492 { NULL
, 0, 0, false, false, false, false, NULL
, NULL
}
4495 /* Create the predefined scalar types of C,
4496 and some nodes representing standard constants (0, 1, (void *) 0).
4497 Initialize the global scope.
4498 Make definitions for built-in primitive functions. */
4501 c_init_decl_processing (void)
4503 location_t save_loc
= input_location
;
4505 /* Initialize reserved words for parser. */
4508 register_scoped_attributes (std_attribute_table
, NULL
);
4510 current_function_decl
= NULL_TREE
;
4512 gcc_obstack_init (&parser_obstack
);
4514 /* Make the externals scope. */
4516 external_scope
= current_scope
;
4518 /* Declarations from c_common_nodes_and_builtins must not be associated
4519 with this input file, lest we get differences between using and not
4520 using preprocessed headers. */
4521 input_location
= BUILTINS_LOCATION
;
4523 c_common_nodes_and_builtins ();
4525 /* In C, comparisons and TRUTH_* expressions have type int. */
4526 truthvalue_type_node
= integer_type_node
;
4527 truthvalue_true_node
= integer_one_node
;
4528 truthvalue_false_node
= integer_zero_node
;
4530 /* Even in C99, which has a real boolean type. */
4531 pushdecl (build_decl (UNKNOWN_LOCATION
, TYPE_DECL
, get_identifier ("_Bool"),
4532 boolean_type_node
));
4534 /* C-specific nullptr initialization. */
4535 record_builtin_type (RID_MAX
, "nullptr_t", nullptr_type_node
);
4536 /* The size and alignment of nullptr_t is the same as for a pointer to
4538 SET_TYPE_ALIGN (nullptr_type_node
, GET_MODE_ALIGNMENT (ptr_mode
));
4540 input_location
= save_loc
;
4542 make_fname_decl
= c_make_fname_decl
;
4543 start_fname_decls ();
4546 /* Create the VAR_DECL at LOC for __FUNCTION__ etc. ID is the name to
4547 give the decl, NAME is the initialization string and TYPE_DEP
4548 indicates whether NAME depended on the type of the function. As we
4549 don't yet implement delayed emission of static data, we mark the
4550 decl as emitted so it is not placed in the output. Anything using
4551 it must therefore pull out the STRING_CST initializer directly.
4555 c_make_fname_decl (location_t loc
, tree id
, int type_dep
)
4557 const char *name
= fname_as_string (type_dep
);
4558 tree decl
, type
, init
;
4559 size_t length
= strlen (name
);
4561 type
= build_array_type (char_type_node
,
4562 build_index_type (size_int (length
)));
4563 type
= c_build_qualified_type (type
, TYPE_QUAL_CONST
);
4565 decl
= build_decl (loc
, VAR_DECL
, id
, type
);
4567 TREE_STATIC (decl
) = 1;
4568 TREE_READONLY (decl
) = 1;
4569 DECL_ARTIFICIAL (decl
) = 1;
4571 init
= build_string (length
+ 1, name
);
4572 free (CONST_CAST (char *, name
));
4573 TREE_TYPE (init
) = type
;
4574 DECL_INITIAL (decl
) = init
;
4576 TREE_USED (decl
) = 1;
4578 if (current_function_decl
4579 /* For invalid programs like this:
4582 const char* p = __FUNCTION__;
4584 the __FUNCTION__ is believed to appear in K&R style function
4585 parameter declarator. In that case we still don't have
4587 && current_function_scope
)
4589 DECL_CONTEXT (decl
) = current_function_decl
;
4590 bind (id
, decl
, current_function_scope
,
4591 /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION
);
4594 finish_decl (decl
, loc
, init
, NULL_TREE
, NULL_TREE
);
4600 c_builtin_function (tree decl
)
4602 tree type
= TREE_TYPE (decl
);
4603 tree id
= DECL_NAME (decl
);
4605 const char *name
= IDENTIFIER_POINTER (id
);
4606 C_DECL_BUILTIN_PROTOTYPE (decl
) = prototype_p (type
);
4608 /* Should never be called on a symbol with a preexisting meaning. */
4609 gcc_assert (!I_SYMBOL_BINDING (id
));
4611 bind (id
, decl
, external_scope
, /*invisible=*/true, /*nested=*/false,
4614 /* Builtins in the implementation namespace are made visible without
4615 needing to be explicitly declared. See push_file_scope. */
4616 if (name
[0] == '_' && (name
[1] == '_' || ISUPPER (name
[1])))
4618 DECL_CHAIN (decl
) = visible_builtins
;
4619 visible_builtins
= decl
;
4626 c_builtin_function_ext_scope (tree decl
)
4628 tree type
= TREE_TYPE (decl
);
4629 tree id
= DECL_NAME (decl
);
4631 const char *name
= IDENTIFIER_POINTER (id
);
4632 C_DECL_BUILTIN_PROTOTYPE (decl
) = prototype_p (type
);
4635 bind (id
, decl
, external_scope
, /*invisible=*/false, /*nested=*/false,
4638 /* Builtins in the implementation namespace are made visible without
4639 needing to be explicitly declared. See push_file_scope. */
4640 if (name
[0] == '_' && (name
[1] == '_' || ISUPPER (name
[1])))
4642 DECL_CHAIN (decl
) = visible_builtins
;
4643 visible_builtins
= decl
;
4649 /* Implement LANG_HOOKS_SIMULATE_BUILTIN_FUNCTION_DECL. */
4652 c_simulate_builtin_function_decl (tree decl
)
4654 tree type
= TREE_TYPE (decl
);
4655 C_DECL_BUILTIN_PROTOTYPE (decl
) = prototype_p (type
);
4656 return pushdecl (decl
);
4659 /* Warn about attributes in a context where they are unused
4660 (attribute-declarations, except for the "fallthrough" case, and
4661 attributes on statements). */
4664 c_warn_unused_attributes (tree attrs
)
4666 for (tree t
= attrs
; t
!= NULL_TREE
; t
= TREE_CHAIN (t
))
4667 if (get_attribute_namespace (t
) == NULL_TREE
)
4668 /* The specifications of standard attributes mean this is a
4669 constraint violation. */
4670 pedwarn (input_location
, OPT_Wattributes
, "%qE attribute ignored",
4671 get_attribute_name (t
));
4672 else if (!attribute_ignored_p (t
))
4673 warning (OPT_Wattributes
, "%qE attribute ignored",
4674 get_attribute_name (t
));
4677 /* Warn for standard attributes being applied to a type that is not
4678 being defined, where that is a constraint violation, and return a
4679 list of attributes with them removed. */
4682 c_warn_type_attributes (tree attrs
)
4684 tree
*attr_ptr
= &attrs
;
4686 if (get_attribute_namespace (*attr_ptr
) == NULL_TREE
)
4688 pedwarn (input_location
, OPT_Wattributes
, "%qE attribute ignored",
4689 get_attribute_name (*attr_ptr
));
4690 *attr_ptr
= TREE_CHAIN (*attr_ptr
);
4693 attr_ptr
= &TREE_CHAIN (*attr_ptr
);
4697 /* Called when a declaration is seen that contains no names to declare.
4698 If its type is a reference to a structure, union or enum inherited
4699 from a containing scope, shadow that tag name for the current scope
4700 with a forward reference.
4701 If its type defines a new named structure or union
4702 or defines an enum, it is valid but we need not do anything here.
4703 Otherwise, it is an error. */
4706 shadow_tag (const struct c_declspecs
*declspecs
)
4708 shadow_tag_warned (declspecs
, 0);
4711 /* WARNED is 1 if we have done a pedwarn, 2 if we have done a warning,
4714 shadow_tag_warned (const struct c_declspecs
*declspecs
, int warned
)
4716 bool found_tag
= false;
4718 if (declspecs
->type
&& !declspecs
->default_int_p
&& !declspecs
->typedef_p
)
4720 tree value
= declspecs
->type
;
4721 enum tree_code code
= TREE_CODE (value
);
4723 if (code
== RECORD_TYPE
|| code
== UNION_TYPE
|| code
== ENUMERAL_TYPE
)
4724 /* Used to test also that TYPE_SIZE (value) != 0.
4725 That caused warning for `struct foo;' at top level in the file. */
4727 tree name
= TYPE_NAME (value
);
4732 if (declspecs
->restrict_p
)
4734 error ("invalid use of %<restrict%>");
4738 if (name
== NULL_TREE
)
4740 if (warned
!= 1 && code
!= ENUMERAL_TYPE
)
4741 /* Empty unnamed enum OK */
4743 pedwarn (input_location
, 0,
4744 "unnamed struct/union that defines no instances");
4748 else if (declspecs
->typespec_kind
!= ctsk_tagdef
4749 && declspecs
->typespec_kind
!= ctsk_tagfirstref
4750 && declspecs
->typespec_kind
!= ctsk_tagfirstref_attrs
4751 && declspecs
->storage_class
!= csc_none
)
4754 pedwarn (input_location
, 0,
4755 "empty declaration with storage class specifier "
4756 "does not redeclare tag");
4758 pending_xref_error ();
4760 else if (declspecs
->typespec_kind
!= ctsk_tagdef
4761 && declspecs
->typespec_kind
!= ctsk_tagfirstref
4762 && declspecs
->typespec_kind
!= ctsk_tagfirstref_attrs
4763 && (declspecs
->const_p
4764 || declspecs
->volatile_p
4765 || declspecs
->atomic_p
4766 || declspecs
->restrict_p
4767 || declspecs
->address_space
))
4770 pedwarn (input_location
, 0,
4771 "empty declaration with type qualifier "
4772 "does not redeclare tag");
4774 pending_xref_error ();
4776 else if (declspecs
->typespec_kind
!= ctsk_tagdef
4777 && declspecs
->typespec_kind
!= ctsk_tagfirstref
4778 && declspecs
->typespec_kind
!= ctsk_tagfirstref_attrs
4779 && declspecs
->alignas_p
)
4782 pedwarn (input_location
, 0,
4783 "empty declaration with %<_Alignas%> "
4784 "does not redeclare tag");
4786 pending_xref_error ();
4790 pending_invalid_xref
= NULL_TREE
;
4791 t
= lookup_tag (code
, name
, true, NULL
);
4795 t
= make_node (code
);
4796 pushtag (input_location
, name
, t
);
4802 if (warned
!= 1 && !in_system_header_at (input_location
))
4804 pedwarn (input_location
, 0,
4805 "useless type name in empty declaration");
4810 else if (warned
!= 1 && !in_system_header_at (input_location
)
4811 && declspecs
->typedef_p
)
4813 pedwarn (input_location
, 0, "useless type name in empty declaration");
4817 pending_invalid_xref
= NULL_TREE
;
4819 if (declspecs
->inline_p
)
4821 error ("%<inline%> in empty declaration");
4825 if (declspecs
->noreturn_p
)
4827 error ("%<_Noreturn%> in empty declaration");
4831 if (current_scope
== file_scope
&& declspecs
->storage_class
== csc_auto
)
4833 error ("%<auto%> in file-scope empty declaration");
4837 if (current_scope
== file_scope
&& declspecs
->storage_class
== csc_register
)
4839 error ("%<register%> in file-scope empty declaration");
4843 if (!warned
&& !in_system_header_at (input_location
)
4844 && declspecs
->storage_class
!= csc_none
)
4846 warning (0, "useless storage class specifier in empty declaration");
4850 if (!warned
&& !in_system_header_at (input_location
) && declspecs
->thread_p
)
4852 warning (0, "useless %qs in empty declaration",
4853 declspecs
->thread_gnu_p
? "__thread" : "_Thread_local");
4858 && !in_system_header_at (input_location
)
4859 && (declspecs
->const_p
4860 || declspecs
->volatile_p
4861 || declspecs
->atomic_p
4862 || declspecs
->restrict_p
4863 || declspecs
->address_space
))
4865 warning (0, "useless type qualifier in empty declaration");
4869 if (!warned
&& !in_system_header_at (input_location
)
4870 && declspecs
->alignas_p
)
4872 warning (0, "useless %<_Alignas%> in empty declaration");
4878 && (declspecs
->typespec_kind
== ctsk_tagref_attrs
4879 || declspecs
->typespec_kind
== ctsk_tagfirstref_attrs
))
4881 /* Standard attributes after the "struct" or "union" keyword are
4882 only permitted when the contents of the type are defined, or
4883 in the form "struct-or-union attribute-specifier-sequence
4884 identifier;". If the ';' was not present, attributes were
4885 diagnosed in the parser. Here, ensure that any other useless
4886 elements of the declaration result in a pedwarn, not just a
4887 warning. Forward declarations of enum types are not part of
4888 standard C, but handle them the same. */
4889 pedwarn (input_location
, 0,
4890 "invalid use of attributes in empty declaration");
4896 if (declspecs
->declspecs_seen_p
4897 && !declspecs
->non_std_attrs_seen_p
)
4898 /* An attribute declaration (but not a fallthrough attribute
4899 declaration, which was handled separately); warn if there
4900 are any attributes being ignored (but not if the attributes
4902 c_warn_unused_attributes (declspecs
->attrs
);
4903 else if (!found_tag
)
4904 pedwarn (input_location
, 0, "empty declaration");
4909 /* Return the qualifiers from SPECS as a bitwise OR of TYPE_QUAL_*
4910 bits. SPECS represents declaration specifiers that the grammar
4911 only permits to contain type qualifiers and attributes. */
4914 quals_from_declspecs (const struct c_declspecs
*specs
)
4916 int quals
= ((specs
->const_p
? TYPE_QUAL_CONST
: 0)
4917 | (specs
->volatile_p
? TYPE_QUAL_VOLATILE
: 0)
4918 | (specs
->restrict_p
? TYPE_QUAL_RESTRICT
: 0)
4919 | (specs
->atomic_p
? TYPE_QUAL_ATOMIC
: 0)
4920 | (ENCODE_QUAL_ADDR_SPACE (specs
->address_space
)));
4921 gcc_assert (!specs
->type
4922 && !specs
->decl_attr
4923 && specs
->typespec_word
== cts_none
4924 && specs
->storage_class
== csc_none
4925 && !specs
->typedef_p
4926 && !specs
->explicit_signed_p
4927 && !specs
->deprecated_p
4928 && !specs
->unavailable_p
4930 && !specs
->long_long_p
4933 && !specs
->unsigned_p
4934 && !specs
->complex_p
4936 && !specs
->noreturn_p
4937 && !specs
->thread_p
);
4941 /* Construct an array declarator. LOC is the location of the
4942 beginning of the array (usually the opening brace). EXPR is the
4943 expression inside [], or NULL_TREE. QUALS are the type qualifiers
4944 inside the [] (to be applied to the pointer to which a parameter
4945 array is converted). STATIC_P is true if "static" is inside the
4946 [], false otherwise. VLA_UNSPEC_P is true if the array is [*], a
4947 VLA of unspecified length which is nevertheless a complete type,
4948 false otherwise. The field for the contained declarator is left to
4949 be filled in by set_array_declarator_inner. */
4951 struct c_declarator
*
4952 build_array_declarator (location_t loc
,
4953 tree expr
, struct c_declspecs
*quals
, bool static_p
,
4956 struct c_declarator
*declarator
= XOBNEW (&parser_obstack
,
4957 struct c_declarator
);
4958 declarator
->id_loc
= loc
;
4959 declarator
->kind
= cdk_array
;
4960 declarator
->declarator
= 0;
4961 declarator
->u
.array
.dimen
= expr
;
4964 declarator
->u
.array
.attrs
= quals
->attrs
;
4965 declarator
->u
.array
.quals
= quals_from_declspecs (quals
);
4969 declarator
->u
.array
.attrs
= NULL_TREE
;
4970 declarator
->u
.array
.quals
= 0;
4972 declarator
->u
.array
.static_p
= static_p
;
4973 declarator
->u
.array
.vla_unspec_p
= vla_unspec_p
;
4974 if (static_p
|| quals
!= NULL
)
4975 pedwarn_c90 (loc
, OPT_Wpedantic
,
4976 "ISO C90 does not support %<static%> or type "
4977 "qualifiers in parameter array declarators");
4979 pedwarn_c90 (loc
, OPT_Wpedantic
,
4980 "ISO C90 does not support %<[*]%> array declarators");
4983 if (!current_scope
->parm_flag
)
4986 error_at (loc
, "%<[*]%> not allowed in other than "
4987 "function prototype scope");
4988 declarator
->u
.array
.vla_unspec_p
= false;
4991 current_scope
->had_vla_unspec
= true;
4996 /* Set the contained declarator of an array declarator. DECL is the
4997 declarator, as constructed by build_array_declarator; INNER is what
4998 appears on the left of the []. */
5000 struct c_declarator
*
5001 set_array_declarator_inner (struct c_declarator
*decl
,
5002 struct c_declarator
*inner
)
5004 decl
->declarator
= inner
;
5008 /* INIT is a constructor that forms DECL's initializer. If the final
5009 element initializes a flexible array field, add the size of that
5010 initializer to DECL's size. */
5013 add_flexible_array_elts_to_size (tree decl
, tree init
)
5017 if (vec_safe_is_empty (CONSTRUCTOR_ELTS (init
)))
5020 elt
= CONSTRUCTOR_ELTS (init
)->last ().value
;
5021 type
= TREE_TYPE (elt
);
5022 if (TREE_CODE (type
) == ARRAY_TYPE
5023 && TYPE_SIZE (type
) == NULL_TREE
5024 && TYPE_DOMAIN (type
) != NULL_TREE
5025 && TYPE_MAX_VALUE (TYPE_DOMAIN (type
)) == NULL_TREE
)
5027 complete_array_type (&type
, elt
, false);
5029 = size_binop (PLUS_EXPR
, DECL_SIZE (decl
), TYPE_SIZE (type
));
5030 DECL_SIZE_UNIT (decl
)
5031 = size_binop (PLUS_EXPR
, DECL_SIZE_UNIT (decl
), TYPE_SIZE_UNIT (type
));
5035 /* Decode a "typename", such as "int **", returning a ..._TYPE node.
5036 Set *EXPR, if EXPR not NULL, to any expression to be evaluated
5037 before the type name, and set *EXPR_CONST_OPERANDS, if
5038 EXPR_CONST_OPERANDS not NULL, to indicate whether the type name may
5039 appear in a constant expression. */
5042 groktypename (struct c_type_name
*type_name
, tree
*expr
,
5043 bool *expr_const_operands
)
5046 tree attrs
= type_name
->specs
->attrs
;
5048 type_name
->specs
->attrs
= NULL_TREE
;
5050 type
= grokdeclarator (type_name
->declarator
, type_name
->specs
, TYPENAME
,
5051 false, NULL
, &attrs
, expr
, expr_const_operands
,
5054 /* Apply attributes. */
5055 attrs
= c_warn_type_attributes (attrs
);
5056 decl_attributes (&type
, attrs
, 0);
5061 /* Looks up the most recent pushed declaration corresponding to DECL. */
5064 lookup_last_decl (tree decl
)
5066 tree last_decl
= lookup_name (DECL_NAME (decl
));
5068 last_decl
= lookup_name_in_scope (DECL_NAME (decl
), external_scope
);
5072 /* Wrapper for decl_attributes that adds some implicit attributes
5073 to VAR_DECLs or FUNCTION_DECLs. */
5076 c_decl_attributes (tree
*node
, tree attributes
, int flags
)
5078 /* Add implicit "omp declare target" attribute if requested. */
5079 if (current_omp_declare_target_attribute
5080 && ((VAR_P (*node
) && is_global_var (*node
))
5081 || TREE_CODE (*node
) == FUNCTION_DECL
))
5083 if (VAR_P (*node
) && !omp_mappable_type (TREE_TYPE (*node
)))
5084 attributes
= tree_cons (get_identifier ("omp declare target implicit"),
5085 NULL_TREE
, attributes
);
5088 attributes
= tree_cons (get_identifier ("omp declare target"),
5089 NULL_TREE
, attributes
);
5090 attributes
= tree_cons (get_identifier ("omp declare target block"),
5091 NULL_TREE
, attributes
);
5095 /* Look up the current declaration with all the attributes merged
5096 so far so that attributes on the current declaration that's
5097 about to be pushed that conflict with the former can be detected,
5098 diagnosed, and rejected as appropriate. */
5099 tree last_decl
= lookup_last_decl (*node
);
5100 return decl_attributes (node
, attributes
, flags
, last_decl
);
5104 /* Decode a declarator in an ordinary declaration or data definition.
5105 This is called as soon as the type information and variable name
5106 have been parsed, before parsing the initializer if any.
5107 Here we create the ..._DECL node, fill in its type,
5108 and put it on the list of decls for the current context.
5109 When nonnull, set *LASTLOC to the location of the prior declaration
5110 of the same entity if one exists.
5111 The ..._DECL node is returned as the value.
5113 Exception: for arrays where the length is not specified,
5114 the type is left null, to be filled in by `finish_decl'.
5116 Function definitions do not come here; they go to start_function
5117 instead. However, external and forward declarations of functions
5118 do go through here. Structure field declarations are done by
5119 grokfield and not through here. */
5122 start_decl (struct c_declarator
*declarator
, struct c_declspecs
*declspecs
,
5123 bool initialized
, tree attributes
, location_t
*lastloc
/* = NULL */)
5127 tree expr
= NULL_TREE
;
5128 enum deprecated_states deprecated_state
= DEPRECATED_NORMAL
;
5130 /* An object declared as __attribute__((unavailable)) suppresses
5131 warnings and errors from __attribute__((deprecated/unavailable))
5133 An object declared as __attribute__((deprecated)) suppresses
5134 warnings of uses of other deprecated items. */
5135 if (lookup_attribute ("unavailable", attributes
))
5136 deprecated_state
= UNAVAILABLE_DEPRECATED_SUPPRESS
;
5137 else if (lookup_attribute ("deprecated", attributes
))
5138 deprecated_state
= DEPRECATED_SUPPRESS
;
5140 decl
= grokdeclarator (declarator
, declspecs
,
5141 NORMAL
, initialized
, NULL
, &attributes
, &expr
, NULL
,
5143 if (!decl
|| decl
== error_mark_node
)
5146 if (tree lastdecl
= lastloc
? lookup_last_decl (decl
) : NULL_TREE
)
5147 if (lastdecl
!= error_mark_node
)
5148 *lastloc
= DECL_SOURCE_LOCATION (lastdecl
);
5151 add_stmt (fold_convert (void_type_node
, expr
));
5153 if (TREE_CODE (decl
) != FUNCTION_DECL
&& MAIN_NAME_P (DECL_NAME (decl
))
5154 && TREE_PUBLIC (decl
))
5155 warning (OPT_Wmain
, "%q+D is usually a function", decl
);
5158 /* Is it valid for this decl to have an initializer at all?
5159 If not, set INITIALIZED to zero, which will indirectly
5160 tell 'finish_decl' to ignore the initializer once it is parsed. */
5161 switch (TREE_CODE (decl
))
5164 error ("typedef %qD is initialized (use %<__typeof__%> instead)", decl
);
5165 initialized
= false;
5169 error ("function %qD is initialized like a variable", decl
);
5170 initialized
= false;
5174 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
5175 error ("parameter %qD is initialized", decl
);
5176 initialized
= false;
5180 /* Don't allow initializations for incomplete types except for
5181 arrays which might be completed by the initialization. */
5183 /* This can happen if the array size is an undefined macro.
5184 We already gave a warning, so we don't need another one. */
5185 if (TREE_TYPE (decl
) == error_mark_node
)
5186 initialized
= false;
5187 else if (COMPLETE_TYPE_P (TREE_TYPE (decl
)))
5189 /* A complete type is ok if size is fixed. If the size is
5190 variable, an empty initializer is OK and nonempty
5191 initializers will be diagnosed in the parser. */
5193 else if (TREE_CODE (TREE_TYPE (decl
)) != ARRAY_TYPE
)
5195 error ("variable %qD has initializer but incomplete type", decl
);
5196 initialized
= false;
5202 if (current_scope
== file_scope
)
5203 TREE_STATIC (decl
) = 1;
5205 /* Tell 'pushdecl' this is an initialized decl
5206 even though we don't yet have the initializer expression.
5207 Also tell 'finish_decl' it may store the real initializer. */
5208 DECL_INITIAL (decl
) = error_mark_node
;
5211 /* If this is a function declaration, write a record describing it to the
5212 prototypes file (if requested). */
5214 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5215 gen_aux_info_record (decl
, 0, 0, prototype_p (TREE_TYPE (decl
)));
5217 /* ANSI specifies that a tentative definition which is not merged with
5218 a non-tentative definition behaves exactly like a definition with an
5219 initializer equal to zero. (Section 3.7.2)
5221 -fno-common gives strict ANSI behavior, though this tends to break
5222 a large body of code that grew up without this rule.
5224 Thread-local variables are never common, since there's no entrenched
5225 body of code to break, and it allows more efficient variable references
5226 in the presence of dynamic linking. */
5230 && TREE_PUBLIC (decl
)
5231 && !DECL_THREAD_LOCAL_P (decl
)
5233 DECL_COMMON (decl
) = 1;
5235 /* Set attributes here so if duplicate decl, will have proper attributes. */
5236 c_decl_attributes (&decl
, attributes
, 0);
5238 /* Handle gnu_inline attribute. */
5239 if (declspecs
->inline_p
5240 && !flag_gnu89_inline
5241 && TREE_CODE (decl
) == FUNCTION_DECL
5242 && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl
))
5243 || current_function_decl
))
5245 if (declspecs
->storage_class
== csc_auto
&& current_scope
!= file_scope
)
5247 else if (declspecs
->storage_class
!= csc_static
)
5248 DECL_EXTERNAL (decl
) = !DECL_EXTERNAL (decl
);
5251 if (TREE_CODE (decl
) == FUNCTION_DECL
5252 && targetm
.calls
.promote_prototypes (TREE_TYPE (decl
)))
5254 struct c_declarator
*ce
= declarator
;
5256 if (ce
->kind
== cdk_pointer
)
5257 ce
= declarator
->declarator
;
5258 if (ce
->kind
== cdk_function
)
5260 tree args
= ce
->u
.arg_info
->parms
;
5261 for (; args
; args
= DECL_CHAIN (args
))
5263 tree type
= TREE_TYPE (args
);
5264 if (type
&& INTEGRAL_TYPE_P (type
)
5265 && TYPE_PRECISION (type
) < TYPE_PRECISION (integer_type_node
))
5266 DECL_ARG_TYPE (args
) = c_type_promotes_to (type
);
5271 if (TREE_CODE (decl
) == FUNCTION_DECL
5272 && DECL_DECLARED_INLINE_P (decl
)
5273 && DECL_UNINLINABLE (decl
)
5274 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl
)))
5275 warning (OPT_Wattributes
, "inline function %q+D given attribute %qs",
5278 /* C99 6.7.4p3: An inline definition of a function with external
5279 linkage shall not contain a definition of a modifiable object
5280 with static storage duration... */
5282 && current_scope
!= file_scope
5283 && TREE_STATIC (decl
)
5284 && !TREE_READONLY (decl
)
5285 && DECL_DECLARED_INLINE_P (current_function_decl
)
5286 && DECL_EXTERNAL (current_function_decl
))
5287 record_inline_static (input_location
, current_function_decl
,
5288 decl
, csi_modifiable
);
5290 if (c_dialect_objc ()
5291 && VAR_OR_FUNCTION_DECL_P (decl
))
5292 objc_check_global_decl (decl
);
5294 /* Add this decl to the current scope.
5295 TEM may equal DECL or it may be a previous decl of the same name. */
5296 tem
= pushdecl (decl
);
5298 if (initialized
&& DECL_EXTERNAL (tem
))
5300 DECL_EXTERNAL (tem
) = 0;
5301 TREE_STATIC (tem
) = 1;
5307 /* Subroutine of finish_decl. TYPE is the type of an uninitialized object
5308 DECL or the non-array element type if DECL is an uninitialized array.
5309 If that type has a const member, diagnose this. */
5312 diagnose_uninitialized_cst_member (tree decl
, tree type
)
5315 for (field
= TYPE_FIELDS (type
); field
; field
= TREE_CHAIN (field
))
5318 if (TREE_CODE (field
) != FIELD_DECL
)
5320 field_type
= strip_array_types (TREE_TYPE (field
));
5322 if (TYPE_QUALS (field_type
) & TYPE_QUAL_CONST
)
5324 auto_diagnostic_group d
;
5325 if (warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wc___compat
,
5326 "uninitialized const member in %qT is invalid in C++",
5327 strip_array_types (TREE_TYPE (decl
))))
5328 inform (DECL_SOURCE_LOCATION (field
), "%qD should be initialized", field
);
5331 if (RECORD_OR_UNION_TYPE_P (field_type
))
5332 diagnose_uninitialized_cst_member (decl
, field_type
);
5336 /* Finish processing of a declaration;
5337 install its initial value.
5338 If ORIGTYPE is not NULL_TREE, it is the original type of INIT.
5339 If the length of an array type is not known before,
5340 it must be determined now, from the initial value, or it is an error.
5342 INIT_LOC is the location of the initial value. */
5345 finish_decl (tree decl
, location_t init_loc
, tree init
,
5346 tree origtype
, tree asmspec_tree
)
5349 bool was_incomplete
= (DECL_SIZE (decl
) == NULL_TREE
);
5350 const char *asmspec
= 0;
5352 /* If a name was specified, get the string. */
5353 if (VAR_OR_FUNCTION_DECL_P (decl
)
5354 && DECL_FILE_SCOPE_P (decl
))
5355 asmspec_tree
= maybe_apply_renaming_pragma (decl
, asmspec_tree
);
5357 asmspec
= TREE_STRING_POINTER (asmspec_tree
);
5360 && TREE_STATIC (decl
)
5361 && global_bindings_p ())
5362 /* So decl is a global variable. Record the types it uses
5363 so that we can decide later to emit debug info for them. */
5364 record_types_used_by_current_var_decl (decl
);
5366 /* If `start_decl' didn't like having an initialization, ignore it now. */
5367 if (init
!= NULL_TREE
&& DECL_INITIAL (decl
) == NULL_TREE
)
5370 /* Don't crash if parm is initialized. */
5371 if (TREE_CODE (decl
) == PARM_DECL
)
5375 store_init_value (init_loc
, decl
, init
, origtype
);
5377 if (c_dialect_objc () && (VAR_OR_FUNCTION_DECL_P (decl
)
5378 || TREE_CODE (decl
) == FIELD_DECL
))
5379 objc_check_decl (decl
);
5381 type
= TREE_TYPE (decl
);
5383 /* Deduce size of array from initialization, if not already known.
5384 This is only needed for an initialization in the current scope;
5385 it must not be done for a file-scope initialization of a
5386 declaration with external linkage, redeclared in an inner scope
5387 with the outer declaration shadowed in an intermediate scope. */
5388 if (TREE_CODE (type
) == ARRAY_TYPE
5389 && TYPE_DOMAIN (type
) == NULL_TREE
5390 && TREE_CODE (decl
) != TYPE_DECL
5391 && !(TREE_PUBLIC (decl
) && current_scope
!= file_scope
))
5394 = (TREE_STATIC (decl
)
5395 /* Even if pedantic, an external linkage array
5396 may have incomplete type at first. */
5397 ? pedantic
&& !TREE_PUBLIC (decl
)
5398 : !DECL_EXTERNAL (decl
));
5400 = complete_array_type (&TREE_TYPE (decl
), DECL_INITIAL (decl
),
5403 /* Get the completed type made by complete_array_type. */
5404 type
= TREE_TYPE (decl
);
5409 error ("initializer fails to determine size of %q+D", decl
);
5414 error ("array size missing in %q+D", decl
);
5418 error ("zero or negative size array %q+D", decl
);
5422 /* For global variables, update the copy of the type that
5423 exists in the binding. */
5424 if (TREE_PUBLIC (decl
))
5426 struct c_binding
*b_ext
= I_SYMBOL_BINDING (DECL_NAME (decl
));
5427 while (b_ext
&& !B_IN_EXTERNAL_SCOPE (b_ext
))
5428 b_ext
= b_ext
->shadowed
;
5429 if (b_ext
&& TREE_CODE (decl
) == TREE_CODE (b_ext
->decl
))
5431 if (b_ext
->u
.type
&& comptypes (b_ext
->u
.type
, type
))
5432 b_ext
->u
.type
= composite_type (b_ext
->u
.type
, type
);
5434 b_ext
->u
.type
= type
;
5443 if (DECL_INITIAL (decl
) && DECL_INITIAL (decl
) != error_mark_node
)
5444 TREE_TYPE (DECL_INITIAL (decl
)) = type
;
5446 relayout_decl (decl
);
5449 /* Look for braced array initializers for character arrays and
5450 recursively convert them into STRING_CSTs. */
5451 if (tree init
= DECL_INITIAL (decl
))
5452 DECL_INITIAL (decl
) = braced_lists_to_strings (type
, init
);
5456 if (init
&& TREE_CODE (init
) == CONSTRUCTOR
)
5457 add_flexible_array_elts_to_size (decl
, init
);
5459 complete_flexible_array_elts (DECL_INITIAL (decl
));
5461 if (is_global_var (decl
))
5463 type_context_kind context
= (DECL_THREAD_LOCAL_P (decl
)
5464 ? TCTX_THREAD_STORAGE
5465 : TCTX_STATIC_STORAGE
);
5466 if (!verify_type_context (input_location
, context
, TREE_TYPE (decl
)))
5467 TREE_TYPE (decl
) = error_mark_node
;
5470 if (DECL_SIZE (decl
) == NULL_TREE
&& TREE_TYPE (decl
) != error_mark_node
5471 && COMPLETE_TYPE_P (TREE_TYPE (decl
)))
5472 layout_decl (decl
, 0);
5474 if (DECL_SIZE (decl
) == NULL_TREE
5475 /* Don't give an error if we already gave one earlier. */
5476 && TREE_TYPE (decl
) != error_mark_node
5477 && (TREE_STATIC (decl
)
5478 /* A static variable with an incomplete type
5479 is an error if it is initialized.
5480 Also if it is not file scope.
5481 Otherwise, let it through, but if it is not `extern'
5482 then it may cause an error message later. */
5483 ? (DECL_INITIAL (decl
) != NULL_TREE
5484 || !DECL_FILE_SCOPE_P (decl
))
5485 /* An automatic variable with an incomplete type
5487 : !DECL_EXTERNAL (decl
)))
5489 error ("storage size of %q+D isn%'t known", decl
);
5490 TREE_TYPE (decl
) = error_mark_node
;
5493 if ((RECORD_OR_UNION_TYPE_P (TREE_TYPE (decl
))
5494 || TREE_CODE (TREE_TYPE (decl
)) == ENUMERAL_TYPE
)
5495 && DECL_SIZE (decl
) == NULL_TREE
5496 && TREE_STATIC (decl
))
5497 incomplete_record_decls
.safe_push (decl
);
5499 if (is_global_var (decl
)
5500 && DECL_SIZE (decl
) != NULL_TREE
5501 && TREE_TYPE (decl
) != error_mark_node
)
5503 if (TREE_CODE (DECL_SIZE (decl
)) == INTEGER_CST
)
5504 constant_expression_warning (DECL_SIZE (decl
));
5507 error ("storage size of %q+D isn%'t constant", decl
);
5508 TREE_TYPE (decl
) = error_mark_node
;
5512 if (TREE_USED (type
))
5514 TREE_USED (decl
) = 1;
5515 DECL_READ_P (decl
) = 1;
5519 /* If this is a function and an assembler name is specified, reset DECL_RTL
5520 so we can give it its new name. Also, update builtin_decl if it
5521 was a normal built-in. */
5522 if (TREE_CODE (decl
) == FUNCTION_DECL
&& asmspec
)
5524 if (DECL_BUILT_IN_CLASS (decl
) == BUILT_IN_NORMAL
)
5525 set_builtin_user_assembler_name (decl
, asmspec
);
5526 set_user_assembler_name (decl
, asmspec
);
5529 /* If #pragma weak was used, mark the decl weak now. */
5530 maybe_apply_pragma_weak (decl
);
5532 /* Output the assembler code and/or RTL code for variables and functions,
5533 unless the type is an undefined structure or union.
5534 If not, it will get done when the type is completed. */
5536 if (VAR_OR_FUNCTION_DECL_P (decl
))
5538 /* Determine the ELF visibility. */
5539 if (TREE_PUBLIC (decl
))
5540 c_determine_visibility (decl
);
5542 /* This is a no-op in c-lang.cc or something real in objc-act.cc. */
5543 if (c_dialect_objc ())
5544 objc_check_decl (decl
);
5548 /* If this is not a static variable, issue a warning.
5549 It doesn't make any sense to give an ASMSPEC for an
5550 ordinary, non-register local variable. Historically,
5551 GCC has accepted -- but ignored -- the ASMSPEC in
5553 if (!DECL_FILE_SCOPE_P (decl
)
5555 && !C_DECL_REGISTER (decl
)
5556 && !TREE_STATIC (decl
))
5557 warning (0, "ignoring %<asm%> specifier for non-static local "
5558 "variable %q+D", decl
);
5560 set_user_assembler_name (decl
, asmspec
);
5563 if (DECL_FILE_SCOPE_P (decl
))
5565 if (DECL_INITIAL (decl
) == NULL_TREE
5566 || DECL_INITIAL (decl
) == error_mark_node
)
5567 /* Don't output anything
5568 when a tentative file-scope definition is seen.
5569 But at end of compilation, do output code for them. */
5570 DECL_DEFER_OUTPUT (decl
) = 1;
5571 if (asmspec
&& VAR_P (decl
) && C_DECL_REGISTER (decl
))
5572 DECL_HARD_REGISTER (decl
) = 1;
5573 rest_of_decl_compilation (decl
, true, 0);
5575 if (TREE_CODE (decl
) == FUNCTION_DECL
)
5577 tree parms
= DECL_ARGUMENTS (decl
);
5578 const bool builtin
= fndecl_built_in_p (decl
);
5579 if (tree access
= build_attr_access_from_parms (parms
, !builtin
))
5580 decl_attributes (&decl
, access
, 0);
5585 /* In conjunction with an ASMSPEC, the `register'
5586 keyword indicates that we should place the variable
5587 in a particular register. */
5588 if (asmspec
&& C_DECL_REGISTER (decl
))
5590 DECL_HARD_REGISTER (decl
) = 1;
5591 /* This cannot be done for a structure with volatile
5592 fields, on which DECL_REGISTER will have been
5594 if (!DECL_REGISTER (decl
))
5595 error ("cannot put object with volatile field into register");
5598 if (TREE_CODE (decl
) != FUNCTION_DECL
)
5600 /* If we're building a variable sized type, and we might be
5601 reachable other than via the top of the current binding
5602 level, then create a new BIND_EXPR so that we deallocate
5603 the object at the right time. */
5604 /* Note that DECL_SIZE can be null due to errors. */
5605 if (DECL_SIZE (decl
)
5606 && !TREE_CONSTANT (DECL_SIZE (decl
))
5607 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list
))
5610 bind
= build3 (BIND_EXPR
, void_type_node
, NULL
, NULL
, NULL
);
5611 TREE_SIDE_EFFECTS (bind
) = 1;
5613 BIND_EXPR_BODY (bind
) = push_stmt_list ();
5615 add_stmt (build_stmt (DECL_SOURCE_LOCATION (decl
),
5621 if (!DECL_FILE_SCOPE_P (decl
))
5623 /* Recompute the RTL of a local array now
5624 if it used to be an incomplete type. */
5625 if (was_incomplete
&& !is_global_var (decl
))
5627 /* If we used it already as memory, it must stay in memory. */
5628 TREE_ADDRESSABLE (decl
) = TREE_USED (decl
);
5629 /* If it's still incomplete now, no init will save it. */
5630 if (DECL_SIZE (decl
) == NULL_TREE
)
5631 DECL_INITIAL (decl
) = NULL_TREE
;
5636 if (TREE_CODE (decl
) == TYPE_DECL
)
5638 if (!DECL_FILE_SCOPE_P (decl
)
5639 && variably_modified_type_p (TREE_TYPE (decl
), NULL_TREE
))
5640 add_stmt (build_stmt (DECL_SOURCE_LOCATION (decl
), DECL_EXPR
, decl
));
5642 rest_of_decl_compilation (decl
, DECL_FILE_SCOPE_P (decl
), 0);
5645 /* Install a cleanup (aka destructor) if one was given. */
5646 if (VAR_P (decl
) && !TREE_STATIC (decl
))
5648 tree attr
= lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl
));
5651 tree cleanup_id
= TREE_VALUE (TREE_VALUE (attr
));
5652 tree cleanup_decl
= lookup_name (cleanup_id
);
5654 vec
<tree
, va_gc
> *v
;
5656 /* Build "cleanup(&decl)" for the destructor. */
5657 cleanup
= build_unary_op (input_location
, ADDR_EXPR
, decl
, false);
5659 v
->quick_push (cleanup
);
5660 cleanup
= c_build_function_call_vec (DECL_SOURCE_LOCATION (decl
),
5661 vNULL
, cleanup_decl
, v
, NULL
);
5664 /* Don't warn about decl unused; the cleanup uses it. */
5665 TREE_USED (decl
) = 1;
5666 TREE_USED (cleanup_decl
) = 1;
5667 DECL_READ_P (decl
) = 1;
5669 push_cleanup (decl
, cleanup
, false);
5675 && !DECL_EXTERNAL (decl
)
5676 && DECL_INITIAL (decl
) == NULL_TREE
)
5678 type
= strip_array_types (type
);
5679 if (TREE_READONLY (decl
))
5680 warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wc___compat
,
5681 "uninitialized %<const %D%> is invalid in C++", decl
);
5682 else if (RECORD_OR_UNION_TYPE_P (type
)
5683 && C_TYPE_FIELDS_READONLY (type
))
5684 diagnose_uninitialized_cst_member (decl
, type
);
5689 && lookup_attribute ("omp declare target implicit",
5690 DECL_ATTRIBUTES (decl
)))
5692 DECL_ATTRIBUTES (decl
)
5693 = remove_attribute ("omp declare target implicit",
5694 DECL_ATTRIBUTES (decl
));
5695 if (!omp_mappable_type (TREE_TYPE (decl
)))
5696 error ("%q+D in declare target directive does not have mappable type",
5698 else if (!lookup_attribute ("omp declare target",
5699 DECL_ATTRIBUTES (decl
))
5700 && !lookup_attribute ("omp declare target link",
5701 DECL_ATTRIBUTES (decl
)))
5703 DECL_ATTRIBUTES (decl
)
5704 = tree_cons (get_identifier ("omp declare target"),
5705 NULL_TREE
, DECL_ATTRIBUTES (decl
));
5706 symtab_node
*node
= symtab_node::get (decl
);
5709 node
->offloadable
= 1;
5710 if (ENABLE_OFFLOADING
)
5712 g
->have_offload
= true;
5713 if (is_a
<varpool_node
*> (node
))
5714 vec_safe_push (offload_vars
, decl
);
5720 /* This is the last point we can lower alignment so give the target the
5723 && !is_global_var (decl
)
5724 && !DECL_HARD_REGISTER (decl
))
5725 targetm
.lower_local_decl_alignment (decl
);
5727 invoke_plugin_callbacks (PLUGIN_FINISH_DECL
, decl
);
5730 /* Given a parsed parameter declaration, decode it into a PARM_DECL.
5731 EXPR is NULL or a pointer to an expression that needs to be
5732 evaluated for the side effects of array size expressions in the
5736 grokparm (const struct c_parm
*parm
, tree
*expr
)
5738 tree attrs
= parm
->attrs
;
5739 tree decl
= grokdeclarator (parm
->declarator
, parm
->specs
, PARM
, false,
5740 NULL
, &attrs
, expr
, NULL
, DEPRECATED_NORMAL
);
5742 decl_attributes (&decl
, attrs
, 0);
5747 /* Return attribute "arg spec" corresponding to an array/VLA parameter
5748 described by PARM, concatenated onto attributes ATTRS.
5749 The spec consists of one dollar symbol for each specified variable
5750 bound, one asterisk for each unspecified variable bound, followed
5751 by at most one specification of the most significant bound of
5752 an ordinary array parameter. For ordinary arrays the specification
5753 is either the constant bound itself, or the space character for
5754 an array with an unspecified bound (the [] form). Finally, a chain
5755 of specified variable bounds is appended to the spec, starting with
5756 the most significant bound. For example, the PARM T a[2][m][3][n]
5757 will produce __attribute__((arg spec ("[$$2]", m, n)).
5758 For T a typedef for an array with variable bounds, the bounds are
5759 included in the specification in the expected order.
5760 No "arg spec" is created for parameters of pointer types, making
5761 a distinction between T(*)[N] (or, equivalently, T[][N]) and
5762 the T[M][N] form, all of which have the same type and are represented
5763 the same, but only the last of which gets an "arg spec" describing
5764 the most significant bound M. */
5767 get_parm_array_spec (const struct c_parm
*parm
, tree attrs
)
5769 /* The attribute specification string, minor bound first. */
5772 /* A list of VLA variable bounds, major first, or null if unspecified
5774 tree vbchain
= NULL_TREE
;
5775 /* True for a pointer parameter. */
5776 bool pointer
= false;
5777 /* True for an ordinary array with an unpecified bound. */
5778 bool nobound
= false;
5780 /* Create a string representation for the bounds of the array/VLA. */
5781 for (c_declarator
*pd
= parm
->declarator
, *next
; pd
; pd
= next
)
5783 next
= pd
->declarator
;
5784 while (next
&& next
->kind
== cdk_attrs
)
5785 next
= next
->declarator
;
5787 /* Remember if a pointer has been seen to avoid storing the constant
5789 if (pd
->kind
== cdk_pointer
)
5792 if ((pd
->kind
== cdk_pointer
|| pd
->kind
== cdk_function
)
5793 && (!next
|| next
->kind
== cdk_id
))
5795 /* Do nothing for the common case of a pointer. The fact that
5796 the parameter is one can be deduced from the absence of
5797 an arg spec for it. */
5801 if (pd
->kind
== cdk_id
)
5804 || !parm
->specs
->type
5805 || TREE_CODE (parm
->specs
->type
) != ARRAY_TYPE
5806 || !TYPE_DOMAIN (parm
->specs
->type
)
5807 || !TYPE_MAX_VALUE (TYPE_DOMAIN (parm
->specs
->type
)))
5810 tree max
= TYPE_MAX_VALUE (TYPE_DOMAIN (parm
->specs
->type
));
5812 && TREE_CODE (max
) == INTEGER_CST
)
5814 /* Extract the upper bound from a parameter of an array type
5815 unless the parameter is an ordinary array of unspecified
5816 bound in which case a next iteration of the loop will
5818 if (spec
.empty () || spec
.end ()[-1] != ' ')
5820 if (!tree_fits_shwi_p (max
))
5823 /* The upper bound is the value of the largest valid
5825 HOST_WIDE_INT n
= tree_to_shwi (max
) + 1;
5827 sprintf (buf
, "%lu", (unsigned long)n
);
5833 /* For a VLA typedef, create a list of its variable bounds and
5834 append it in the expected order to VBCHAIN. */
5835 tree tpbnds
= NULL_TREE
;
5836 for (tree type
= parm
->specs
->type
; TREE_CODE (type
) == ARRAY_TYPE
;
5837 type
= TREE_TYPE (type
))
5839 tree nelts
= array_type_nelts (type
);
5840 if (error_operand_p (nelts
))
5842 if (TREE_CODE (nelts
) != INTEGER_CST
)
5844 /* Each variable VLA bound is represented by the dollar
5847 tpbnds
= tree_cons (NULL_TREE
, nelts
, tpbnds
);
5850 tpbnds
= nreverse (tpbnds
);
5851 vbchain
= chainon (vbchain
, tpbnds
);
5855 if (pd
->kind
!= cdk_array
)
5858 if (pd
->u
.array
.vla_unspec_p
)
5860 /* Each unspecified bound is represented by a star. There
5861 can be any number of these in a declaration (but none in
5867 tree nelts
= pd
->u
.array
.dimen
;
5870 /* Ordinary array of unspecified size. There can be at most
5871 one for the most significant bound. Exit on the next
5872 iteration which determines whether or not PARM is declared
5873 as a pointer or an array. */
5878 if (pd
->u
.array
.static_p
)
5881 if (!INTEGRAL_TYPE_P (TREE_TYPE (nelts
)))
5882 /* Avoid invalid NELTS. */
5886 nelts
= c_fully_fold (nelts
, false, nullptr);
5887 if (TREE_CODE (nelts
) == INTEGER_CST
)
5889 /* Skip all constant bounds except the most significant one.
5890 The interior ones are included in the array type. */
5891 if (next
&& (next
->kind
== cdk_array
|| next
->kind
== cdk_pointer
))
5894 if (!tree_fits_uhwi_p (nelts
))
5895 /* Bail completely on invalid bounds. */
5899 unsigned HOST_WIDE_INT n
= tree_to_uhwi (nelts
);
5900 sprintf (buf
, "%llu", (unsigned long long)n
);
5905 /* Each variable VLA bound is represented by a dollar sign. */
5907 vbchain
= tree_cons (NULL_TREE
, nelts
, vbchain
);
5910 if (spec
.empty () && !nobound
)
5913 spec
.insert (0, "[");
5915 /* Ordinary array of unspecified bound is represented by a space.
5916 It must be last in the spec. */
5920 tree acsstr
= build_string (spec
.length () + 1, spec
.c_str ());
5921 tree args
= tree_cons (NULL_TREE
, acsstr
, vbchain
);
5922 tree name
= get_identifier ("arg spec");
5923 return tree_cons (name
, args
, attrs
);
5926 /* Given a parsed parameter declaration, decode it into a PARM_DECL
5927 and push that on the current scope. EXPR is a pointer to an
5928 expression that needs to be evaluated for the side effects of array
5929 size expressions in the parameters. */
5932 push_parm_decl (const struct c_parm
*parm
, tree
*expr
)
5934 tree attrs
= parm
->attrs
;
5935 tree decl
= grokdeclarator (parm
->declarator
, parm
->specs
, PARM
, false, NULL
,
5936 &attrs
, expr
, NULL
, DEPRECATED_NORMAL
);
5937 if (decl
&& DECL_P (decl
))
5938 DECL_SOURCE_LOCATION (decl
) = parm
->loc
;
5940 attrs
= get_parm_array_spec (parm
, attrs
);
5941 decl_attributes (&decl
, attrs
, 0);
5943 decl
= pushdecl (decl
);
5945 finish_decl (decl
, input_location
, NULL_TREE
, NULL_TREE
, NULL_TREE
);
5948 /* Mark all the parameter declarations to date as forward decls.
5949 Also diagnose use of this extension. */
5952 mark_forward_parm_decls (void)
5954 struct c_binding
*b
;
5956 if (pedantic
&& !current_scope
->warned_forward_parm_decls
)
5958 pedwarn (input_location
, OPT_Wpedantic
,
5959 "ISO C forbids forward parameter declarations");
5960 current_scope
->warned_forward_parm_decls
= true;
5963 for (b
= current_scope
->bindings
; b
; b
= b
->prev
)
5964 if (TREE_CODE (b
->decl
) == PARM_DECL
)
5965 TREE_ASM_WRITTEN (b
->decl
) = 1;
5968 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
5969 literal, which may be an incomplete array type completed by the
5970 initializer; INIT is a CONSTRUCTOR at LOC that initializes the compound
5971 literal. NON_CONST is true if the initializers contain something
5972 that cannot occur in a constant expression. If ALIGNAS_ALIGN is nonzero,
5973 it is the (valid) alignment for this compound literal, as specified
5977 build_compound_literal (location_t loc
, tree type
, tree init
, bool non_const
,
5978 unsigned int alignas_align
)
5980 /* We do not use start_decl here because we have a type, not a declarator;
5981 and do not use finish_decl because the decl should be stored inside
5982 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_EXPR. */
5987 if (type
== error_mark_node
5988 || init
== error_mark_node
)
5989 return error_mark_node
;
5991 decl
= build_decl (loc
, VAR_DECL
, NULL_TREE
, type
);
5992 DECL_EXTERNAL (decl
) = 0;
5993 TREE_PUBLIC (decl
) = 0;
5994 TREE_STATIC (decl
) = (current_scope
== file_scope
);
5995 DECL_CONTEXT (decl
) = current_function_decl
;
5996 TREE_USED (decl
) = 1;
5997 DECL_READ_P (decl
) = 1;
5998 DECL_ARTIFICIAL (decl
) = 1;
5999 DECL_IGNORED_P (decl
) = 1;
6000 C_DECL_COMPOUND_LITERAL_P (decl
) = 1;
6001 TREE_TYPE (decl
) = type
;
6002 c_apply_type_quals_to_decl (TYPE_QUALS (strip_array_types (type
)), decl
);
6005 SET_DECL_ALIGN (decl
, alignas_align
* BITS_PER_UNIT
);
6006 DECL_USER_ALIGN (decl
) = 1;
6008 store_init_value (loc
, decl
, init
, NULL_TREE
);
6010 if (TREE_CODE (type
) == ARRAY_TYPE
&& !COMPLETE_TYPE_P (type
))
6012 int failure
= complete_array_type (&TREE_TYPE (decl
),
6013 DECL_INITIAL (decl
), true);
6014 /* If complete_array_type returns 3, it means that the
6015 initial value of the compound literal is empty. Allow it. */
6016 gcc_assert (failure
== 0 || failure
== 3);
6018 type
= TREE_TYPE (decl
);
6019 TREE_TYPE (DECL_INITIAL (decl
)) = type
;
6022 if (type
== error_mark_node
|| !COMPLETE_TYPE_P (type
))
6024 c_incomplete_type_error (loc
, NULL_TREE
, type
);
6025 return error_mark_node
;
6028 if (TREE_STATIC (decl
)
6029 && !verify_type_context (loc
, TCTX_STATIC_STORAGE
, type
))
6030 return error_mark_node
;
6032 stmt
= build_stmt (DECL_SOURCE_LOCATION (decl
), DECL_EXPR
, decl
);
6033 complit
= build1 (COMPOUND_LITERAL_EXPR
, type
, stmt
);
6034 TREE_SIDE_EFFECTS (complit
) = 1;
6036 layout_decl (decl
, 0);
6038 if (TREE_STATIC (decl
))
6040 /* This decl needs a name for the assembler output. */
6041 set_compound_literal_name (decl
);
6042 DECL_DEFER_OUTPUT (decl
) = 1;
6043 DECL_COMDAT (decl
) = 1;
6045 rest_of_decl_compilation (decl
, 1, 0);
6047 else if (current_function_decl
&& !current_scope
->parm_flag
)
6052 complit
= build2 (C_MAYBE_CONST_EXPR
, type
, NULL
, complit
);
6053 C_MAYBE_CONST_EXPR_NON_CONST (complit
) = 1;
6059 /* Check the type of a compound literal. Here we just check that it
6060 is valid for C++. */
6063 check_compound_literal_type (location_t loc
, struct c_type_name
*type_name
)
6066 && (type_name
->specs
->typespec_kind
== ctsk_tagdef
6067 || type_name
->specs
->typespec_kind
== ctsk_tagfirstref
6068 || type_name
->specs
->typespec_kind
== ctsk_tagfirstref_attrs
))
6069 warning_at (loc
, OPT_Wc___compat
,
6070 "defining a type in a compound literal is invalid in C++");
6073 /* Performs sanity checks on the TYPE and WIDTH of the bit-field NAME,
6074 replacing with appropriate values if they are invalid. */
6077 check_bitfield_type_and_width (location_t loc
, tree
*type
, tree
*width
,
6081 unsigned int max_width
;
6082 unsigned HOST_WIDE_INT w
;
6083 const char *name
= (orig_name
6084 ? identifier_to_locale (IDENTIFIER_POINTER (orig_name
))
6085 : _("<anonymous>"));
6087 /* Detect and ignore out of range field width and process valid
6089 if (!INTEGRAL_TYPE_P (TREE_TYPE (*width
)))
6091 error_at (loc
, "bit-field %qs width not an integer constant", name
);
6092 *width
= integer_one_node
;
6096 if (TREE_CODE (*width
) != INTEGER_CST
)
6098 *width
= c_fully_fold (*width
, false, NULL
);
6099 if (TREE_CODE (*width
) == INTEGER_CST
)
6100 pedwarn (loc
, OPT_Wpedantic
,
6101 "bit-field %qs width not an integer constant expression",
6104 if (TREE_CODE (*width
) != INTEGER_CST
)
6106 error_at (loc
, "bit-field %qs width not an integer constant", name
);
6107 *width
= integer_one_node
;
6109 constant_expression_warning (*width
);
6110 if (tree_int_cst_sgn (*width
) < 0)
6112 error_at (loc
, "negative width in bit-field %qs", name
);
6113 *width
= integer_one_node
;
6115 else if (integer_zerop (*width
) && orig_name
)
6117 error_at (loc
, "zero width for bit-field %qs", name
);
6118 *width
= integer_one_node
;
6122 /* Detect invalid bit-field type. */
6123 if (TREE_CODE (*type
) != INTEGER_TYPE
6124 && TREE_CODE (*type
) != BOOLEAN_TYPE
6125 && TREE_CODE (*type
) != ENUMERAL_TYPE
)
6127 error_at (loc
, "bit-field %qs has invalid type", name
);
6128 *type
= unsigned_type_node
;
6131 if (TYPE_WARN_IF_NOT_ALIGN (*type
))
6133 error_at (loc
, "cannot declare bit-field %qs with %<warn_if_not_aligned%> type",
6135 *type
= unsigned_type_node
;
6138 type_mv
= TYPE_MAIN_VARIANT (*type
);
6139 if (!in_system_header_at (input_location
)
6140 && type_mv
!= integer_type_node
6141 && type_mv
!= unsigned_type_node
6142 && type_mv
!= boolean_type_node
)
6143 pedwarn_c90 (loc
, OPT_Wpedantic
,
6144 "type of bit-field %qs is a GCC extension", name
);
6146 max_width
= TYPE_PRECISION (*type
);
6148 if (compare_tree_int (*width
, max_width
) > 0)
6150 error_at (loc
, "width of %qs exceeds its type", name
);
6152 *width
= build_int_cst (integer_type_node
, w
);
6155 w
= tree_to_uhwi (*width
);
6157 if (TREE_CODE (*type
) == ENUMERAL_TYPE
)
6159 struct lang_type
*lt
= TYPE_LANG_SPECIFIC (*type
);
6161 || w
< tree_int_cst_min_precision (lt
->enum_min
, TYPE_SIGN (*type
))
6162 || w
< tree_int_cst_min_precision (lt
->enum_max
, TYPE_SIGN (*type
)))
6163 warning_at (loc
, 0, "%qs is narrower than values of its type", name
);
6169 /* Print warning about variable length array if necessary. */
6172 warn_variable_length_array (tree name
, tree size
)
6174 if (TREE_CONSTANT (size
))
6177 pedwarn_c90 (input_location
, OPT_Wvla
,
6178 "ISO C90 forbids array %qE whose size "
6179 "cannot be evaluated", name
);
6181 pedwarn_c90 (input_location
, OPT_Wvla
, "ISO C90 forbids array "
6182 "whose size cannot be evaluated");
6187 pedwarn_c90 (input_location
, OPT_Wvla
,
6188 "ISO C90 forbids variable length array %qE", name
);
6190 pedwarn_c90 (input_location
, OPT_Wvla
, "ISO C90 forbids variable "
6195 /* Print warning about defaulting to int if necessary. */
6198 warn_defaults_to (location_t location
, int opt
, const char *gmsgid
, ...)
6200 diagnostic_info diagnostic
;
6202 rich_location
richloc (line_table
, location
);
6204 va_start (ap
, gmsgid
);
6205 diagnostic_set_info (&diagnostic
, gmsgid
, &ap
, &richloc
,
6206 flag_isoc99
? DK_PEDWARN
: DK_WARNING
);
6207 diagnostic
.option_index
= opt
;
6208 diagnostic_report_diagnostic (global_dc
, &diagnostic
);
6212 /* Returns the smallest location != UNKNOWN_LOCATION in LOCATIONS,
6213 considering only those c_declspec_words found in LIST, which
6214 must be terminated by cdw_number_of_elements. */
6217 smallest_type_quals_location (const location_t
*locations
,
6218 const c_declspec_word
*list
)
6220 location_t loc
= UNKNOWN_LOCATION
;
6221 while (*list
!= cdw_number_of_elements
)
6223 location_t newloc
= locations
[*list
];
6224 if (loc
== UNKNOWN_LOCATION
6225 || (newloc
!= UNKNOWN_LOCATION
&& newloc
< loc
))
6233 /* Given declspecs and a declarator,
6234 determine the name and type of the object declared
6235 and construct a ..._DECL node for it.
6236 (In one case we can return a ..._TYPE node instead.
6237 For invalid input we sometimes return NULL_TREE.)
6239 DECLSPECS is a c_declspecs structure for the declaration specifiers.
6241 DECL_CONTEXT says which syntactic context this declaration is in:
6242 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
6243 FUNCDEF for a function definition. Like NORMAL but a few different
6244 error messages in each case. Return value may be zero meaning
6245 this definition is too screwy to try to parse.
6246 PARM for a parameter declaration (either within a function prototype
6247 or before a function body). Make a PARM_DECL, or return void_type_node.
6248 TYPENAME if for a typename (in a cast or sizeof).
6249 Don't make a DECL node; just return the ..._TYPE node.
6250 FIELD for a struct or union field; make a FIELD_DECL.
6251 INITIALIZED is true if the decl has an initializer.
6252 WIDTH is non-NULL for bit-fields, and is a pointer to an INTEGER_CST node
6253 representing the width of the bit-field.
6254 DECL_ATTRS points to the list of attributes that should be added to this
6255 decl. Any nested attributes that belong on the decl itself will be
6257 If EXPR is not NULL, any expressions that need to be evaluated as
6258 part of evaluating variably modified types will be stored in *EXPR.
6259 If EXPR_CONST_OPERANDS is not NULL, *EXPR_CONST_OPERANDS will be
6260 set to indicate whether operands in *EXPR can be used in constant
6262 DEPRECATED_STATE is a deprecated_states value indicating whether
6263 deprecation/unavailability warnings should be suppressed.
6265 In the TYPENAME case, DECLARATOR is really an absolute declarator.
6266 It may also be so in the PARM case, for a prototype where the
6267 argument type is specified but not the name.
6269 This function is where the complicated C meanings of `static'
6270 and `extern' are interpreted. */
6273 grokdeclarator (const struct c_declarator
*declarator
,
6274 struct c_declspecs
*declspecs
,
6275 enum decl_context decl_context
, bool initialized
, tree
*width
,
6276 tree
*decl_attrs
, tree
*expr
, bool *expr_const_operands
,
6277 enum deprecated_states deprecated_state
)
6279 tree type
= declspecs
->type
;
6280 bool threadp
= declspecs
->thread_p
;
6281 enum c_storage_class storage_class
= declspecs
->storage_class
;
6286 int type_quals
= TYPE_UNQUALIFIED
;
6287 tree name
= NULL_TREE
;
6288 bool funcdef_flag
= false;
6289 bool funcdef_syntax
= false;
6290 bool size_varies
= false;
6291 tree decl_attr
= declspecs
->decl_attr
;
6292 int array_ptr_quals
= TYPE_UNQUALIFIED
;
6293 tree array_ptr_attrs
= NULL_TREE
;
6294 bool array_parm_static
= false;
6295 bool array_parm_vla_unspec_p
= false;
6296 tree returned_attrs
= NULL_TREE
;
6297 tree decl_id_attrs
= NULL_TREE
;
6298 bool bitfield
= width
!= NULL
;
6300 tree orig_qual_type
= NULL
;
6301 size_t orig_qual_indirect
= 0;
6302 struct c_arg_info
*arg_info
= 0;
6303 addr_space_t as1
, as2
, address_space
;
6304 location_t loc
= UNKNOWN_LOCATION
;
6306 bool expr_const_operands_dummy
;
6307 enum c_declarator_kind first_non_attr_kind
;
6308 unsigned int alignas_align
= 0;
6310 if (TREE_CODE (type
) == ERROR_MARK
)
6311 return error_mark_node
;
6315 expr_dummy
= NULL_TREE
;
6317 if (expr_const_operands
== NULL
)
6318 expr_const_operands
= &expr_const_operands_dummy
;
6320 if (declspecs
->expr
)
6323 *expr
= build2 (COMPOUND_EXPR
, TREE_TYPE (declspecs
->expr
), *expr
,
6326 *expr
= declspecs
->expr
;
6328 *expr_const_operands
= declspecs
->expr_const_operands
;
6330 if (decl_context
== FUNCDEF
)
6331 funcdef_flag
= true, decl_context
= NORMAL
;
6333 /* Look inside a declarator for the name being declared
6334 and get it as an IDENTIFIER_NODE, for an error message. */
6336 const struct c_declarator
*decl
= declarator
;
6338 first_non_attr_kind
= cdk_attrs
;
6348 funcdef_syntax
= (decl
->kind
== cdk_function
);
6349 if (first_non_attr_kind
== cdk_attrs
)
6350 first_non_attr_kind
= decl
->kind
;
6351 decl
= decl
->declarator
;
6355 decl
= decl
->declarator
;
6361 name
= decl
->u
.id
.id
;
6362 decl_id_attrs
= decl
->u
.id
.attrs
;
6363 if (first_non_attr_kind
== cdk_attrs
)
6364 first_non_attr_kind
= decl
->kind
;
6371 if (name
== NULL_TREE
)
6373 gcc_assert (decl_context
== PARM
6374 || decl_context
== TYPENAME
6375 || (decl_context
== FIELD
6376 && declarator
->kind
== cdk_id
));
6377 gcc_assert (!initialized
);
6381 /* A function definition's declarator must have the form of
6382 a function declarator. */
6384 if (funcdef_flag
&& !funcdef_syntax
)
6387 /* If this looks like a function definition, make it one,
6388 even if it occurs where parms are expected.
6389 Then store_parm_decls will reject it and not use it as a parm. */
6390 if (decl_context
== NORMAL
&& !funcdef_flag
&& current_scope
->parm_flag
)
6391 decl_context
= PARM
;
6393 if (deprecated_state
!= UNAVAILABLE_DEPRECATED_SUPPRESS
)
6395 if (declspecs
->unavailable_p
)
6396 error_unavailable_use (declspecs
->type
, declspecs
->decl_attr
);
6397 else if (declspecs
->deprecated_p
6398 && deprecated_state
!= DEPRECATED_SUPPRESS
)
6399 warn_deprecated_use (declspecs
->type
, declspecs
->decl_attr
);
6402 if ((decl_context
== NORMAL
|| decl_context
== FIELD
)
6403 && current_scope
== file_scope
6404 && variably_modified_type_p (type
, NULL_TREE
))
6407 error_at (loc
, "variably modified %qE at file scope", name
);
6409 error_at (loc
, "variably modified field at file scope");
6410 type
= integer_type_node
;
6413 size_varies
= C_TYPE_VARIABLE_SIZE (type
) != 0;
6415 /* Diagnose defaulting to "int". */
6417 if (declspecs
->default_int_p
&& !in_system_header_at (input_location
))
6419 /* Issue a warning if this is an ISO C 99 program or if
6420 -Wreturn-type and this is a function, or if -Wimplicit;
6421 prefer the former warning since it is more explicit. */
6422 if ((warn_implicit_int
|| warn_return_type
> 0 || flag_isoc99
)
6424 warn_about_return_type
= 1;
6428 warn_defaults_to (loc
, OPT_Wimplicit_int
,
6429 "type defaults to %<int%> in declaration "
6432 warn_defaults_to (loc
, OPT_Wimplicit_int
,
6433 "type defaults to %<int%> in type name");
6437 /* Adjust the type if a bit-field is being declared,
6438 -funsigned-bitfields applied and the type is not explicitly
6440 if (bitfield
&& !flag_signed_bitfields
&& !declspecs
->explicit_signed_p
6441 && TREE_CODE (type
) == INTEGER_TYPE
)
6442 type
= unsigned_type_for (type
);
6444 /* Figure out the type qualifiers for the declaration. There are
6445 two ways a declaration can become qualified. One is something
6446 like `const int i' where the `const' is explicit. Another is
6447 something like `typedef const int CI; CI i' where the type of the
6448 declaration contains the `const'. A third possibility is that
6449 there is a type qualifier on the element type of a typedefed
6450 array type, in which case we should extract that qualifier so
6451 that c_apply_type_quals_to_decl receives the full list of
6452 qualifiers to work with (C90 is not entirely clear about whether
6453 duplicate qualifiers should be diagnosed in this case, but it
6454 seems most appropriate to do so). */
6455 element_type
= strip_array_types (type
);
6456 constp
= declspecs
->const_p
+ TYPE_READONLY (element_type
);
6457 restrictp
= declspecs
->restrict_p
+ TYPE_RESTRICT (element_type
);
6458 volatilep
= declspecs
->volatile_p
+ TYPE_VOLATILE (element_type
);
6459 atomicp
= declspecs
->atomic_p
+ TYPE_ATOMIC (element_type
);
6460 as1
= declspecs
->address_space
;
6461 as2
= TYPE_ADDR_SPACE (element_type
);
6462 address_space
= ADDR_SPACE_GENERIC_P (as1
)? as2
: as1
;
6465 pedwarn_c90 (loc
, OPT_Wpedantic
, "duplicate %<const%>");
6467 pedwarn_c90 (loc
, OPT_Wpedantic
, "duplicate %<restrict%>");
6469 pedwarn_c90 (loc
, OPT_Wpedantic
, "duplicate %<volatile%>");
6471 pedwarn_c90 (loc
, OPT_Wpedantic
, "duplicate %<_Atomic%>");
6473 if (!ADDR_SPACE_GENERIC_P (as1
) && !ADDR_SPACE_GENERIC_P (as2
) && as1
!= as2
)
6474 error_at (loc
, "conflicting named address spaces (%s vs %s)",
6475 c_addr_space_name (as1
), c_addr_space_name (as2
));
6477 if ((TREE_CODE (type
) == ARRAY_TYPE
6478 || first_non_attr_kind
== cdk_array
)
6479 && TYPE_QUALS (element_type
))
6481 orig_qual_type
= type
;
6482 type
= TYPE_MAIN_VARIANT (type
);
6484 type_quals
= ((constp
? TYPE_QUAL_CONST
: 0)
6485 | (restrictp
? TYPE_QUAL_RESTRICT
: 0)
6486 | (volatilep
? TYPE_QUAL_VOLATILE
: 0)
6487 | (atomicp
? TYPE_QUAL_ATOMIC
: 0)
6488 | ENCODE_QUAL_ADDR_SPACE (address_space
));
6489 if (type_quals
!= TYPE_QUALS (element_type
))
6490 orig_qual_type
= NULL_TREE
;
6492 /* Applying the _Atomic qualifier to an array type (through the use
6493 of typedefs or typeof) must be detected here. If the qualifier
6494 is introduced later, any appearance of applying it to an array is
6495 actually applying it to an element of that array. */
6496 if (declspecs
->atomic_p
&& TREE_CODE (type
) == ARRAY_TYPE
)
6497 error_at (loc
, "%<_Atomic%>-qualified array type");
6499 /* Warn about storage classes that are invalid for certain
6500 kinds of declarations (parameters, typenames, etc.). */
6504 || storage_class
== csc_auto
6505 || storage_class
== csc_register
6506 || storage_class
== csc_typedef
))
6508 if (storage_class
== csc_auto
)
6510 (current_scope
== file_scope
) ? 0 : OPT_Wpedantic
,
6511 "function definition declared %<auto%>");
6512 if (storage_class
== csc_register
)
6513 error_at (loc
, "function definition declared %<register%>");
6514 if (storage_class
== csc_typedef
)
6515 error_at (loc
, "function definition declared %<typedef%>");
6517 error_at (loc
, "function definition declared %qs",
6518 declspecs
->thread_gnu_p
? "__thread" : "_Thread_local");
6520 if (storage_class
== csc_auto
6521 || storage_class
== csc_register
6522 || storage_class
== csc_typedef
)
6523 storage_class
= csc_none
;
6525 else if (decl_context
!= NORMAL
&& (storage_class
!= csc_none
|| threadp
))
6527 if (decl_context
== PARM
&& storage_class
== csc_register
)
6531 switch (decl_context
)
6535 error_at (loc
, "storage class specified for structure "
6538 error_at (loc
, "storage class specified for structure field");
6542 error_at (loc
, "storage class specified for parameter %qE",
6545 error_at (loc
, "storage class specified for unnamed parameter");
6548 error_at (loc
, "storage class specified for typename");
6551 storage_class
= csc_none
;
6555 else if (storage_class
== csc_extern
6559 /* 'extern' with initialization is invalid if not at file scope. */
6560 if (current_scope
== file_scope
)
6562 /* It is fine to have 'extern const' when compiling at C
6563 and C++ intersection. */
6564 if (!(warn_cxx_compat
&& constp
))
6565 warning_at (loc
, 0, "%qE initialized and declared %<extern%>",
6569 error_at (loc
, "%qE has both %<extern%> and initializer", name
);
6571 else if (current_scope
== file_scope
)
6573 if (storage_class
== csc_auto
)
6574 error_at (loc
, "file-scope declaration of %qE specifies %<auto%>",
6576 if (pedantic
&& storage_class
== csc_register
)
6577 pedwarn (input_location
, OPT_Wpedantic
,
6578 "file-scope declaration of %qE specifies %<register%>", name
);
6582 if (storage_class
== csc_extern
&& funcdef_flag
)
6583 error_at (loc
, "nested function %qE declared %<extern%>", name
);
6584 else if (threadp
&& storage_class
== csc_none
)
6586 error_at (loc
, "function-scope %qE implicitly auto and declared "
6588 declspecs
->thread_gnu_p
? "__thread" : "_Thread_local");
6593 /* Now figure out the structure of the declarator proper.
6594 Descend through it, creating more complex types, until we reach
6595 the declared identifier (or NULL_TREE, in an absolute declarator).
6596 At each stage we maintain an unqualified version of the type
6597 together with any qualifiers that should be applied to it with
6598 c_build_qualified_type; this way, array types including
6599 multidimensional array types are first built up in unqualified
6600 form and then the qualified form is created with
6601 TYPE_MAIN_VARIANT pointing to the unqualified form. */
6603 while (declarator
&& declarator
->kind
!= cdk_id
)
6605 if (type
== error_mark_node
)
6607 declarator
= declarator
->declarator
;
6611 /* Each level of DECLARATOR is either a cdk_array (for ...[..]),
6612 a cdk_pointer (for *...),
6613 a cdk_function (for ...(...)),
6614 a cdk_attrs (for nested attributes),
6615 or a cdk_id (for the name being declared
6616 or the place in an absolute declarator
6617 where the name was omitted).
6618 For the last case, we have just exited the loop.
6620 At this point, TYPE is the type of elements of an array,
6621 or for a function to return, or for a pointer to point to.
6622 After this sequence of ifs, TYPE is the type of the
6623 array or function or pointer, and DECLARATOR has had its
6624 outermost layer removed. */
6626 if (array_ptr_quals
!= TYPE_UNQUALIFIED
6627 || array_ptr_attrs
!= NULL_TREE
6628 || array_parm_static
)
6630 /* Only the innermost declarator (making a parameter be of
6631 array type which is converted to pointer type)
6632 may have static or type qualifiers. */
6633 error_at (loc
, "static or type qualifiers in non-parameter array declarator");
6634 array_ptr_quals
= TYPE_UNQUALIFIED
;
6635 array_ptr_attrs
= NULL_TREE
;
6636 array_parm_static
= false;
6639 switch (declarator
->kind
)
6643 /* A declarator with embedded attributes. */
6644 tree attrs
= declarator
->u
.attrs
;
6645 const struct c_declarator
*inner_decl
;
6647 declarator
= declarator
->declarator
;
6648 /* Standard attribute syntax precisely defines what entity
6649 an attribute in each position appertains to, so only
6650 apply laxity about positioning to GNU attribute syntax.
6651 Standard attributes applied to a function or array
6652 declarator apply exactly to that type; standard
6653 attributes applied to the identifier apply to the
6654 declaration rather than to the type, and are specified
6655 using a cdk_id declarator rather than using
6657 inner_decl
= declarator
;
6658 while (inner_decl
->kind
== cdk_attrs
)
6659 inner_decl
= inner_decl
->declarator
;
6660 if (!cxx11_attribute_p (attrs
))
6662 if (inner_decl
->kind
== cdk_id
)
6663 attr_flags
|= (int) ATTR_FLAG_DECL_NEXT
;
6664 else if (inner_decl
->kind
== cdk_function
)
6665 attr_flags
|= (int) ATTR_FLAG_FUNCTION_NEXT
;
6666 else if (inner_decl
->kind
== cdk_array
)
6667 attr_flags
|= (int) ATTR_FLAG_ARRAY_NEXT
;
6669 attrs
= c_warn_type_attributes (attrs
);
6670 returned_attrs
= decl_attributes (&type
,
6671 chainon (returned_attrs
, attrs
),
6677 tree itype
= NULL_TREE
;
6678 tree size
= declarator
->u
.array
.dimen
;
6679 /* The index is a signed object `sizetype' bits wide. */
6680 tree index_type
= c_common_signed_type (sizetype
);
6682 array_ptr_quals
= declarator
->u
.array
.quals
;
6683 array_ptr_attrs
= declarator
->u
.array
.attrs
;
6684 array_parm_static
= declarator
->u
.array
.static_p
;
6685 array_parm_vla_unspec_p
= declarator
->u
.array
.vla_unspec_p
;
6687 declarator
= declarator
->declarator
;
6689 /* Check for some types that there cannot be arrays of. */
6691 if (VOID_TYPE_P (type
))
6694 error_at (loc
, "declaration of %qE as array of voids", name
);
6696 error_at (loc
, "declaration of type name as array of voids");
6697 type
= error_mark_node
;
6700 if (TREE_CODE (type
) == FUNCTION_TYPE
)
6703 error_at (loc
, "declaration of %qE as array of functions",
6706 error_at (loc
, "declaration of type name as array of "
6708 type
= error_mark_node
;
6711 if (pedantic
&& !in_system_header_at (input_location
)
6712 && flexible_array_type_p (type
))
6713 pedwarn (loc
, OPT_Wpedantic
,
6714 "invalid use of structure with flexible array member");
6716 if (size
== error_mark_node
)
6717 type
= error_mark_node
;
6719 if (type
== error_mark_node
)
6722 if (!verify_type_context (loc
, TCTX_ARRAY_ELEMENT
, type
))
6724 type
= error_mark_node
;
6728 /* If size was specified, set ITYPE to a range-type for
6729 that size. Otherwise, ITYPE remains null. finish_decl
6730 may figure it out from an initial value. */
6734 bool size_maybe_const
= true;
6735 bool size_int_const
= (TREE_CODE (size
) == INTEGER_CST
6736 && !TREE_OVERFLOW (size
));
6737 bool this_size_varies
= false;
6739 /* Strip NON_LVALUE_EXPRs since we aren't using as an
6741 STRIP_TYPE_NOPS (size
);
6743 if (!INTEGRAL_TYPE_P (TREE_TYPE (size
)))
6746 error_at (loc
, "size of array %qE has non-integer type",
6750 "size of unnamed array has non-integer type");
6751 size
= integer_one_node
;
6752 size_int_const
= true;
6754 /* This can happen with enum forward declaration. */
6755 else if (!COMPLETE_TYPE_P (TREE_TYPE (size
)))
6758 error_at (loc
, "size of array %qE has incomplete type",
6761 error_at (loc
, "size of unnamed array has incomplete "
6763 size
= integer_one_node
;
6764 size_int_const
= true;
6767 size
= c_fully_fold (size
, false, &size_maybe_const
);
6769 if (pedantic
&& size_maybe_const
&& integer_zerop (size
))
6772 pedwarn (loc
, OPT_Wpedantic
,
6773 "ISO C forbids zero-size array %qE", name
);
6775 pedwarn (loc
, OPT_Wpedantic
,
6776 "ISO C forbids zero-size array");
6779 if (TREE_CODE (size
) == INTEGER_CST
&& size_maybe_const
)
6781 constant_expression_warning (size
);
6782 if (tree_int_cst_sgn (size
) < 0)
6785 error_at (loc
, "size of array %qE is negative", name
);
6787 error_at (loc
, "size of unnamed array is negative");
6788 size
= integer_one_node
;
6789 size_int_const
= true;
6791 /* Handle a size folded to an integer constant but
6792 not an integer constant expression. */
6793 if (!size_int_const
)
6795 /* If this is a file scope declaration of an
6796 ordinary identifier, this is invalid code;
6797 diagnosing it here and not subsequently
6798 treating the type as variable-length avoids
6799 more confusing diagnostics later. */
6800 if ((decl_context
== NORMAL
|| decl_context
== FIELD
)
6801 && current_scope
== file_scope
)
6802 pedwarn (input_location
, 0,
6803 "variably modified %qE at file scope",
6806 this_size_varies
= size_varies
= true;
6807 warn_variable_length_array (name
, size
);
6810 else if ((decl_context
== NORMAL
|| decl_context
== FIELD
)
6811 && current_scope
== file_scope
)
6813 error_at (loc
, "variably modified %qE at file scope", name
);
6814 size
= integer_one_node
;
6818 /* Make sure the array size remains visibly
6819 nonconstant even if it is (eg) a const variable
6820 with known value. */
6821 this_size_varies
= size_varies
= true;
6822 warn_variable_length_array (name
, size
);
6823 if (sanitize_flags_p (SANITIZE_VLA
)
6824 && current_function_decl
!= NULL_TREE
6825 && decl_context
== NORMAL
)
6827 /* Evaluate the array size only once. */
6828 size
= save_expr (size
);
6829 size
= c_fully_fold (size
, false, NULL
);
6830 size
= fold_build2 (COMPOUND_EXPR
, TREE_TYPE (size
),
6831 ubsan_instrument_vla (loc
, size
),
6836 if (integer_zerop (size
) && !this_size_varies
)
6838 /* A zero-length array cannot be represented with
6839 an unsigned index type, which is what we'll
6840 get with build_index_type. Create an
6841 open-ended range instead. */
6842 itype
= build_range_type (sizetype
, size
, NULL_TREE
);
6846 /* Arrange for the SAVE_EXPR on the inside of the
6847 MINUS_EXPR, which allows the -1 to get folded
6848 with the +1 that happens when building TYPE_SIZE. */
6850 size
= save_expr (size
);
6851 if (this_size_varies
&& TREE_CODE (size
) == INTEGER_CST
)
6852 size
= build2 (COMPOUND_EXPR
, TREE_TYPE (size
),
6853 integer_zero_node
, size
);
6855 /* Compute the maximum valid index, that is, size
6856 - 1. Do the calculation in index_type, so that
6857 if it is a variable the computations will be
6858 done in the proper mode. */
6859 itype
= fold_build2_loc (loc
, MINUS_EXPR
, index_type
,
6860 convert (index_type
, size
),
6861 convert (index_type
,
6864 /* The above overflows when size does not fit
6866 ??? While a size of INT_MAX+1 technically shouldn't
6867 cause an overflow (because we subtract 1), handling
6868 this case seems like an unnecessary complication. */
6869 if (TREE_CODE (size
) == INTEGER_CST
6870 && !int_fits_type_p (size
, index_type
))
6873 error_at (loc
, "size of array %qE is too large",
6876 error_at (loc
, "size of unnamed array is too large");
6877 type
= error_mark_node
;
6881 itype
= build_index_type (itype
);
6883 if (this_size_varies
)
6885 if (TREE_SIDE_EFFECTS (size
))
6888 *expr
= build2 (COMPOUND_EXPR
, TREE_TYPE (size
),
6893 *expr_const_operands
&= size_maybe_const
;
6896 else if (decl_context
== FIELD
)
6898 bool flexible_array_member
= false;
6899 if (array_parm_vla_unspec_p
)
6900 /* Field names can in fact have function prototype
6901 scope so [*] is disallowed here through making
6902 the field variably modified, not through being
6903 something other than a declaration with function
6908 const struct c_declarator
*t
= declarator
;
6909 while (t
->kind
== cdk_attrs
)
6911 flexible_array_member
= (t
->kind
== cdk_id
);
6913 if (flexible_array_member
6914 && !in_system_header_at (input_location
))
6915 pedwarn_c90 (loc
, OPT_Wpedantic
, "ISO C90 does not "
6916 "support flexible array members");
6918 /* ISO C99 Flexible array members are effectively
6919 identical to GCC's zero-length array extension. */
6920 if (flexible_array_member
|| array_parm_vla_unspec_p
)
6921 itype
= build_range_type (sizetype
, size_zero_node
,
6924 else if (decl_context
== PARM
)
6926 if (array_parm_vla_unspec_p
)
6928 itype
= build_range_type (sizetype
, size_zero_node
, NULL_TREE
);
6932 else if (decl_context
== TYPENAME
)
6934 if (array_parm_vla_unspec_p
)
6937 warning (0, "%<[*]%> not in a declaration");
6938 /* We use this to avoid messing up with incomplete
6939 array types of the same type, that would
6940 otherwise be modified below. */
6941 itype
= build_range_type (sizetype
, size_zero_node
,
6947 /* Complain about arrays of incomplete types. */
6948 if (!COMPLETE_TYPE_P (type
))
6950 auto_diagnostic_group d
;
6951 error_at (loc
, "array type has incomplete element type %qT",
6953 /* See if we can be more helpful. */
6954 if (TREE_CODE (type
) == ARRAY_TYPE
)
6957 inform (loc
, "declaration of %qE as multidimensional "
6958 "array must have bounds for all dimensions "
6959 "except the first", name
);
6961 inform (loc
, "declaration of multidimensional array "
6962 "must have bounds for all dimensions except "
6965 type
= error_mark_node
;
6968 /* When itype is NULL, a shared incomplete array type is
6969 returned for all array of a given type. Elsewhere we
6970 make sure we don't complete that type before copying
6971 it, but here we want to make sure we don't ever
6972 modify the shared type, so we gcc_assert (itype)
6975 addr_space_t as
= DECODE_QUAL_ADDR_SPACE (type_quals
);
6976 if (!ADDR_SPACE_GENERIC_P (as
) && as
!= TYPE_ADDR_SPACE (type
))
6977 type
= build_qualified_type (type
,
6978 ENCODE_QUAL_ADDR_SPACE (as
));
6980 type
= build_array_type (type
, itype
);
6983 if (type
!= error_mark_node
)
6987 /* It is ok to modify type here even if itype is
6988 NULL: if size_varies, we're in a
6989 multi-dimensional array and the inner type has
6990 variable size, so the enclosing shared array type
6992 if (size
&& TREE_CODE (size
) == INTEGER_CST
)
6994 = build_distinct_type_copy (TYPE_MAIN_VARIANT (type
));
6995 C_TYPE_VARIABLE_SIZE (type
) = 1;
6998 /* The GCC extension for zero-length arrays differs from
6999 ISO flexible array members in that sizeof yields
7001 if (size
&& integer_zerop (size
))
7004 type
= build_distinct_type_copy (TYPE_MAIN_VARIANT (type
));
7005 TYPE_SIZE (type
) = bitsize_zero_node
;
7006 TYPE_SIZE_UNIT (type
) = size_zero_node
;
7007 SET_TYPE_STRUCTURAL_EQUALITY (type
);
7009 if (array_parm_vla_unspec_p
)
7012 /* The type is complete. C99 6.7.5.2p4 */
7013 type
= build_distinct_type_copy (TYPE_MAIN_VARIANT (type
));
7014 TYPE_SIZE (type
) = bitsize_zero_node
;
7015 TYPE_SIZE_UNIT (type
) = size_zero_node
;
7016 SET_TYPE_STRUCTURAL_EQUALITY (type
);
7019 if (!valid_array_size_p (loc
, type
, name
))
7020 type
= error_mark_node
;
7023 if (decl_context
!= PARM
7024 && (array_ptr_quals
!= TYPE_UNQUALIFIED
7025 || array_ptr_attrs
!= NULL_TREE
7026 || array_parm_static
))
7028 error_at (loc
, "static or type qualifiers in non-parameter "
7029 "array declarator");
7030 array_ptr_quals
= TYPE_UNQUALIFIED
;
7031 array_ptr_attrs
= NULL_TREE
;
7032 array_parm_static
= false;
7034 orig_qual_indirect
++;
7039 /* Say it's a definition only for the declarator closest
7040 to the identifier, apart possibly from some
7042 bool really_funcdef
= false;
7044 orig_qual_type
= NULL_TREE
;
7047 const struct c_declarator
*t
= declarator
->declarator
;
7048 while (t
->kind
== cdk_attrs
)
7050 really_funcdef
= (t
->kind
== cdk_id
);
7053 /* Declaring a function type. Make sure we have a valid
7054 type for the function to return. */
7055 if (type
== error_mark_node
)
7058 size_varies
= false;
7060 /* Warn about some types functions can't return. */
7061 if (TREE_CODE (type
) == FUNCTION_TYPE
)
7064 error_at (loc
, "%qE declared as function returning a "
7067 error_at (loc
, "type name declared as function "
7068 "returning a function");
7069 type
= integer_type_node
;
7071 if (TREE_CODE (type
) == ARRAY_TYPE
)
7074 error_at (loc
, "%qE declared as function returning an array",
7077 error_at (loc
, "type name declared as function returning "
7079 type
= integer_type_node
;
7082 /* Construct the function type and go to the next
7083 inner layer of declarator. */
7084 arg_info
= declarator
->u
.arg_info
;
7085 arg_types
= grokparms (arg_info
, really_funcdef
);
7087 /* Type qualifiers before the return type of the function
7088 qualify the return type, not the function type. */
7091 const enum c_declspec_word ignored_quals_list
[] =
7093 cdw_const
, cdw_volatile
, cdw_restrict
, cdw_address_space
,
7094 cdw_atomic
, cdw_number_of_elements
7096 location_t specs_loc
7097 = smallest_type_quals_location (declspecs
->locations
,
7098 ignored_quals_list
);
7099 if (specs_loc
== UNKNOWN_LOCATION
)
7100 specs_loc
= declspecs
->locations
[cdw_typedef
];
7101 if (specs_loc
== UNKNOWN_LOCATION
)
7104 /* Type qualifiers on a function return type are
7105 normally permitted by the standard but have no
7106 effect, so give a warning at -Wreturn-type.
7107 Qualifiers on a void return type are banned on
7108 function definitions in ISO C; GCC used to used
7109 them for noreturn functions. The resolution of C11
7110 DR#423 means qualifiers (other than _Atomic) are
7111 actually removed from the return type when
7112 determining the function type. */
7113 int quals_used
= type_quals
;
7115 quals_used
&= TYPE_QUAL_ATOMIC
;
7116 if (quals_used
&& VOID_TYPE_P (type
) && really_funcdef
)
7117 pedwarn (specs_loc
, 0,
7118 "function definition has qualified void "
7121 warning_at (specs_loc
, OPT_Wignored_qualifiers
,
7122 "type qualifiers ignored on function "
7125 /* Ensure an error for restrict on invalid types; the
7126 DR#423 resolution is not entirely clear about
7129 && (type_quals
& TYPE_QUAL_RESTRICT
)
7130 && (!POINTER_TYPE_P (type
)
7131 || !C_TYPE_OBJECT_OR_INCOMPLETE_P (TREE_TYPE (type
))))
7132 error_at (loc
, "invalid use of %<restrict%>");
7133 type
= c_build_qualified_type (type
, quals_used
);
7135 type_quals
= TYPE_UNQUALIFIED
;
7137 type
= build_function_type (type
, arg_types
);
7138 declarator
= declarator
->declarator
;
7140 /* Set the TYPE_CONTEXTs for each tagged type which is local to
7141 the formal parameter list of this FUNCTION_TYPE to point to
7142 the FUNCTION_TYPE node itself. */
7147 FOR_EACH_VEC_SAFE_ELT_REVERSE (arg_info
->tags
, ix
, tag
)
7148 TYPE_CONTEXT (tag
->type
) = type
;
7154 /* Merge any constancy or volatility into the target type
7156 if ((type_quals
& TYPE_QUAL_ATOMIC
)
7157 && TREE_CODE (type
) == FUNCTION_TYPE
)
7160 "%<_Atomic%>-qualified function type");
7161 type_quals
&= ~TYPE_QUAL_ATOMIC
;
7163 else if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
7165 pedwarn (loc
, OPT_Wpedantic
,
7166 "ISO C forbids qualified function types");
7168 type
= c_build_qualified_type (type
, type_quals
, orig_qual_type
,
7169 orig_qual_indirect
);
7170 orig_qual_type
= NULL_TREE
;
7171 size_varies
= false;
7173 /* When the pointed-to type involves components of variable size,
7174 care must be taken to ensure that the size evaluation code is
7175 emitted early enough to dominate all the possible later uses
7176 and late enough for the variables on which it depends to have
7179 This is expected to happen automatically when the pointed-to
7180 type has a name/declaration of it's own, but special attention
7181 is required if the type is anonymous.
7183 We attach an artificial TYPE_DECL to such pointed-to type
7184 and arrange for it to be included in a DECL_EXPR. This
7185 forces the sizes evaluation at a safe point and ensures it
7186 is not deferred until e.g. within a deeper conditional context.
7188 PARM contexts have no enclosing statement list that
7189 can hold the DECL_EXPR, so we need to use a BIND_EXPR
7190 instead, and add it to the list of expressions that
7191 need to be evaluated.
7193 TYPENAME contexts do have an enclosing statement list,
7194 but it would be incorrect to use it, as the size should
7195 only be evaluated if the containing expression is
7196 evaluated. We might also be in the middle of an
7197 expression with side effects on the pointed-to type size
7198 "arguments" prior to the pointer declaration point and
7199 the fake TYPE_DECL in the enclosing context would force
7200 the size evaluation prior to the side effects. We therefore
7201 use BIND_EXPRs in TYPENAME contexts too. */
7202 if (!TYPE_NAME (type
)
7203 && variably_modified_type_p (type
, NULL_TREE
))
7205 tree bind
= NULL_TREE
;
7206 if (decl_context
== TYPENAME
|| decl_context
== PARM
)
7208 bind
= build3 (BIND_EXPR
, void_type_node
, NULL_TREE
,
7209 NULL_TREE
, NULL_TREE
);
7210 TREE_SIDE_EFFECTS (bind
) = 1;
7211 BIND_EXPR_BODY (bind
) = push_stmt_list ();
7214 tree decl
= build_decl (loc
, TYPE_DECL
, NULL_TREE
, type
);
7215 DECL_ARTIFICIAL (decl
) = 1;
7217 finish_decl (decl
, loc
, NULL_TREE
, NULL_TREE
, NULL_TREE
);
7218 TYPE_NAME (type
) = decl
;
7222 BIND_EXPR_BODY (bind
)
7223 = pop_stmt_list (BIND_EXPR_BODY (bind
));
7225 *expr
= build2 (COMPOUND_EXPR
, void_type_node
, *expr
,
7232 type
= c_build_pointer_type (type
);
7234 /* Process type qualifiers (such as const or volatile)
7235 that were given inside the `*'. */
7236 type_quals
= declarator
->u
.pointer_quals
;
7238 declarator
= declarator
->declarator
;
7245 *decl_attrs
= chainon (returned_attrs
, *decl_attrs
);
7246 *decl_attrs
= chainon (decl_id_attrs
, *decl_attrs
);
7248 /* Now TYPE has the actual type, apart from any qualifiers in
7251 /* Warn about address space used for things other than static memory or
7253 address_space
= DECODE_QUAL_ADDR_SPACE (type_quals
);
7254 if (!ADDR_SPACE_GENERIC_P (address_space
))
7256 if (decl_context
== NORMAL
)
7258 switch (storage_class
)
7261 error ("%qs combined with %<auto%> qualifier for %qE",
7262 c_addr_space_name (address_space
), name
);
7265 error ("%qs combined with %<register%> qualifier for %qE",
7266 c_addr_space_name (address_space
), name
);
7269 if (current_function_scope
)
7271 error ("%qs specified for auto variable %qE",
7272 c_addr_space_name (address_space
), name
);
7284 else if (decl_context
== PARM
&& TREE_CODE (type
) != ARRAY_TYPE
)
7287 error ("%qs specified for parameter %qE",
7288 c_addr_space_name (address_space
), name
);
7290 error ("%qs specified for unnamed parameter",
7291 c_addr_space_name (address_space
));
7293 else if (decl_context
== FIELD
)
7296 error ("%qs specified for structure field %qE",
7297 c_addr_space_name (address_space
), name
);
7299 error ("%qs specified for structure field",
7300 c_addr_space_name (address_space
));
7304 /* Check the type and width of a bit-field. */
7307 check_bitfield_type_and_width (loc
, &type
, width
, name
);
7308 /* C11 makes it implementation-defined (6.7.2.1#5) whether
7309 atomic types are permitted for bit-fields; we have no code to
7310 make bit-field accesses atomic, so disallow them. */
7311 if (type_quals
& TYPE_QUAL_ATOMIC
)
7314 error_at (loc
, "bit-field %qE has atomic type", name
);
7316 error_at (loc
, "bit-field has atomic type");
7317 type_quals
&= ~TYPE_QUAL_ATOMIC
;
7321 /* Reject invalid uses of _Alignas. */
7322 if (declspecs
->alignas_p
)
7324 if (storage_class
== csc_typedef
)
7325 error_at (loc
, "alignment specified for typedef %qE", name
);
7326 else if (storage_class
== csc_register
)
7327 error_at (loc
, "alignment specified for %<register%> object %qE",
7329 else if (decl_context
== PARM
)
7332 error_at (loc
, "alignment specified for parameter %qE", name
);
7334 error_at (loc
, "alignment specified for unnamed parameter");
7339 error_at (loc
, "alignment specified for bit-field %qE", name
);
7341 error_at (loc
, "alignment specified for unnamed bit-field");
7343 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
7344 error_at (loc
, "alignment specified for function %qE", name
);
7345 else if (declspecs
->align_log
!= -1 && TYPE_P (type
))
7347 alignas_align
= 1U << declspecs
->align_log
;
7348 if (alignas_align
< min_align_of_type (type
))
7351 error_at (loc
, "%<_Alignas%> specifiers cannot reduce "
7352 "alignment of %qE", name
);
7354 error_at (loc
, "%<_Alignas%> specifiers cannot reduce "
7355 "alignment of unnamed field");
7361 /* If this is declaring a typedef name, return a TYPE_DECL. */
7363 if (storage_class
== csc_typedef
)
7366 if ((type_quals
& TYPE_QUAL_ATOMIC
)
7367 && TREE_CODE (type
) == FUNCTION_TYPE
)
7370 "%<_Atomic%>-qualified function type");
7371 type_quals
&= ~TYPE_QUAL_ATOMIC
;
7373 else if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
7375 pedwarn (loc
, OPT_Wpedantic
,
7376 "ISO C forbids qualified function types");
7378 type
= c_build_qualified_type (type
, type_quals
, orig_qual_type
,
7379 orig_qual_indirect
);
7380 decl
= build_decl (declarator
->id_loc
,
7381 TYPE_DECL
, declarator
->u
.id
.id
, type
);
7382 if (declspecs
->explicit_signed_p
)
7383 C_TYPEDEF_EXPLICITLY_SIGNED (decl
) = 1;
7384 if (declspecs
->inline_p
)
7385 pedwarn (loc
, 0,"typedef %q+D declared %<inline%>", decl
);
7386 if (declspecs
->noreturn_p
)
7387 pedwarn (loc
, 0,"typedef %q+D declared %<_Noreturn%>", decl
);
7389 if (warn_cxx_compat
&& declarator
->u
.id
.id
!= NULL_TREE
)
7391 struct c_binding
*b
= I_TAG_BINDING (declarator
->u
.id
.id
);
7394 && b
->decl
!= NULL_TREE
7395 && (B_IN_CURRENT_SCOPE (b
)
7396 || (current_scope
== file_scope
&& B_IN_EXTERNAL_SCOPE (b
)))
7397 && TYPE_MAIN_VARIANT (b
->decl
) != TYPE_MAIN_VARIANT (type
))
7399 auto_diagnostic_group d
;
7400 if (warning_at (declarator
->id_loc
, OPT_Wc___compat
,
7401 ("using %qD as both a typedef and a tag is "
7402 "invalid in C++"), decl
)
7403 && b
->locus
!= UNKNOWN_LOCATION
)
7404 inform (b
->locus
, "originally defined here");
7411 /* If this is a type name (such as, in a cast or sizeof),
7412 compute the type and return it now. */
7414 if (decl_context
== TYPENAME
)
7416 /* Note that the grammar rejects storage classes in typenames
7418 gcc_assert (storage_class
== csc_none
&& !threadp
7419 && !declspecs
->inline_p
&& !declspecs
->noreturn_p
);
7420 if ((type_quals
& TYPE_QUAL_ATOMIC
)
7421 && TREE_CODE (type
) == FUNCTION_TYPE
)
7424 "%<_Atomic%>-qualified function type");
7425 type_quals
&= ~TYPE_QUAL_ATOMIC
;
7427 else if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
7429 pedwarn (loc
, OPT_Wpedantic
,
7430 "ISO C forbids const or volatile function types");
7432 type
= c_build_qualified_type (type
, type_quals
, orig_qual_type
,
7433 orig_qual_indirect
);
7437 if (pedantic
&& decl_context
== FIELD
7438 && variably_modified_type_p (type
, NULL_TREE
))
7441 pedwarn (loc
, OPT_Wpedantic
, "a member of a structure or union cannot "
7442 "have a variably modified type");
7445 /* Aside from typedefs and type names (handle above),
7446 `void' at top level (not within pointer)
7447 is allowed only in public variables.
7448 We don't complain about parms either, but that is because
7449 a better error message can be made later. */
7451 if (VOID_TYPE_P (type
) && decl_context
!= PARM
7452 && !((decl_context
!= FIELD
&& TREE_CODE (type
) != FUNCTION_TYPE
)
7453 && (storage_class
== csc_extern
7454 || (current_scope
== file_scope
7455 && !(storage_class
== csc_static
7456 || storage_class
== csc_register
)))))
7458 error_at (loc
, "variable or field %qE declared void", name
);
7459 type
= integer_type_node
;
7462 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
7463 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
7468 if (decl_context
== PARM
)
7471 bool array_parameter_p
= false;
7473 /* A parameter declared as an array of T is really a pointer to T.
7474 One declared as a function is really a pointer to a function. */
7476 if (TREE_CODE (type
) == ARRAY_TYPE
)
7478 /* Transfer const-ness of array into that of type pointed to. */
7479 type
= TREE_TYPE (type
);
7480 if (orig_qual_type
!= NULL_TREE
)
7482 if (orig_qual_indirect
== 0)
7483 orig_qual_type
= TREE_TYPE (orig_qual_type
);
7485 orig_qual_indirect
--;
7488 type
= c_build_qualified_type (type
, type_quals
, orig_qual_type
,
7489 orig_qual_indirect
);
7490 type
= c_build_pointer_type (type
);
7491 type_quals
= array_ptr_quals
;
7493 type
= c_build_qualified_type (type
, type_quals
);
7495 /* We don't yet implement attributes in this context. */
7496 if (array_ptr_attrs
!= NULL_TREE
)
7497 warning_at (loc
, OPT_Wattributes
,
7498 "attributes in parameter array declarator ignored");
7500 size_varies
= false;
7501 array_parameter_p
= true;
7503 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
7505 if (type_quals
& TYPE_QUAL_ATOMIC
)
7508 "%<_Atomic%>-qualified function type");
7509 type_quals
&= ~TYPE_QUAL_ATOMIC
;
7511 else if (type_quals
)
7512 pedwarn (loc
, OPT_Wpedantic
,
7513 "ISO C forbids qualified function types");
7515 type
= c_build_qualified_type (type
, type_quals
);
7516 type
= c_build_pointer_type (type
);
7517 type_quals
= TYPE_UNQUALIFIED
;
7519 else if (type_quals
)
7520 type
= c_build_qualified_type (type
, type_quals
);
7522 decl
= build_decl (declarator
->id_loc
,
7523 PARM_DECL
, declarator
->u
.id
.id
, type
);
7525 C_DECL_VARIABLE_SIZE (decl
) = 1;
7526 C_ARRAY_PARAMETER (decl
) = array_parameter_p
;
7528 /* Compute the type actually passed in the parmlist,
7529 for the case where there is no prototype.
7530 (For example, shorts and chars are passed as ints.)
7531 When there is a prototype, this is overridden later. */
7533 if (type
== error_mark_node
)
7534 promoted_type
= type
;
7536 promoted_type
= c_type_promotes_to (type
);
7538 DECL_ARG_TYPE (decl
) = promoted_type
;
7539 if (declspecs
->inline_p
)
7540 pedwarn (loc
, 0, "parameter %q+D declared %<inline%>", decl
);
7541 if (declspecs
->noreturn_p
)
7542 pedwarn (loc
, 0, "parameter %q+D declared %<_Noreturn%>", decl
);
7544 else if (decl_context
== FIELD
)
7546 /* Note that the grammar rejects storage classes in typenames
7548 gcc_assert (storage_class
== csc_none
&& !threadp
7549 && !declspecs
->inline_p
&& !declspecs
->noreturn_p
);
7551 /* Structure field. It may not be a function. */
7553 if (TREE_CODE (type
) == FUNCTION_TYPE
)
7555 error_at (loc
, "field %qE declared as a function", name
);
7556 type
= build_pointer_type (type
);
7558 else if (TREE_CODE (type
) != ERROR_MARK
7559 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type
))
7562 error_at (loc
, "field %qE has incomplete type", name
);
7564 error_at (loc
, "unnamed field has incomplete type");
7565 type
= error_mark_node
;
7567 else if (TREE_CODE (type
) == ARRAY_TYPE
7568 && TYPE_DOMAIN (type
) == NULL_TREE
)
7570 /* We have a flexible array member through a typedef.
7571 Set suitable range. Whether this is a correct position
7572 for a flexible array member will be determined elsewhere. */
7573 if (!in_system_header_at (input_location
))
7574 pedwarn_c90 (loc
, OPT_Wpedantic
, "ISO C90 does not "
7575 "support flexible array members");
7576 type
= build_distinct_type_copy (TYPE_MAIN_VARIANT (type
));
7577 TYPE_DOMAIN (type
) = build_range_type (sizetype
, size_zero_node
,
7579 if (orig_qual_indirect
== 0)
7580 orig_qual_type
= NULL_TREE
;
7582 if (type
!= error_mark_node
7583 && !verify_type_context (loc
, TCTX_FIELD
, type
))
7584 type
= error_mark_node
;
7586 type
= c_build_qualified_type (type
, type_quals
, orig_qual_type
,
7587 orig_qual_indirect
);
7588 decl
= build_decl (declarator
->id_loc
,
7589 FIELD_DECL
, declarator
->u
.id
.id
, type
);
7590 DECL_NONADDRESSABLE_P (decl
) = bitfield
;
7591 if (bitfield
&& !declarator
->u
.id
.id
)
7592 DECL_PADDING_P (decl
) = 1;
7595 C_DECL_VARIABLE_SIZE (decl
) = 1;
7597 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
7599 if (storage_class
== csc_register
|| threadp
)
7601 error_at (loc
, "invalid storage class for function %qE", name
);
7603 else if (current_scope
!= file_scope
)
7605 /* Function declaration not at file scope. Storage
7606 classes other than `extern' are not allowed, C99
7607 6.7.1p5, and `extern' makes no difference. However,
7608 GCC allows 'auto', perhaps with 'inline', to support
7609 nested functions. */
7610 if (storage_class
== csc_auto
)
7611 pedwarn (loc
, OPT_Wpedantic
,
7612 "invalid storage class for function %qE", name
);
7613 else if (storage_class
== csc_static
)
7615 error_at (loc
, "invalid storage class for function %qE", name
);
7617 storage_class
= declspecs
->storage_class
= csc_none
;
7623 decl
= build_decl (declarator
->id_loc
,
7624 FUNCTION_DECL
, declarator
->u
.id
.id
, type
);
7625 decl
= build_decl_attribute_variant (decl
, decl_attr
);
7627 if (type_quals
& TYPE_QUAL_ATOMIC
)
7630 "%<_Atomic%>-qualified function type");
7631 type_quals
&= ~TYPE_QUAL_ATOMIC
;
7633 else if (pedantic
&& type_quals
&& !DECL_IN_SYSTEM_HEADER (decl
))
7634 pedwarn (loc
, OPT_Wpedantic
,
7635 "ISO C forbids qualified function types");
7637 /* Every function declaration is an external reference
7638 (DECL_EXTERNAL) except for those which are not at file
7639 scope and are explicitly declared "auto". This is
7640 forbidden by standard C (C99 6.7.1p5) and is interpreted by
7641 GCC to signify a forward declaration of a nested function. */
7642 if (storage_class
== csc_auto
&& current_scope
!= file_scope
)
7643 DECL_EXTERNAL (decl
) = 0;
7644 /* In C99, a function which is declared 'inline' with 'extern'
7645 is not an external reference (which is confusing). It
7646 means that the later definition of the function must be output
7647 in this file, C99 6.7.4p6. In GNU C89, a function declared
7648 'extern inline' is an external reference. */
7649 else if (declspecs
->inline_p
&& storage_class
!= csc_static
)
7650 DECL_EXTERNAL (decl
) = ((storage_class
== csc_extern
)
7651 == flag_gnu89_inline
);
7653 DECL_EXTERNAL (decl
) = !initialized
;
7655 /* Record absence of global scope for `static' or `auto'. */
7657 = !(storage_class
== csc_static
|| storage_class
== csc_auto
);
7659 /* For a function definition, record the argument information
7660 block where store_parm_decls will look for it. */
7662 current_function_arg_info
= arg_info
;
7664 if (declspecs
->default_int_p
)
7665 C_FUNCTION_IMPLICIT_INT (decl
) = 1;
7667 /* Record presence of `inline' and `_Noreturn', if it is
7669 if (flag_hosted
&& MAIN_NAME_P (declarator
->u
.id
.id
))
7671 if (declspecs
->inline_p
)
7672 pedwarn (loc
, 0, "cannot inline function %<main%>");
7673 if (declspecs
->noreturn_p
)
7674 pedwarn (loc
, 0, "%<main%> declared %<_Noreturn%>");
7678 if (declspecs
->inline_p
)
7679 /* Record that the function is declared `inline'. */
7680 DECL_DECLARED_INLINE_P (decl
) = 1;
7681 if (declspecs
->noreturn_p
)
7684 pedwarn_c99 (loc
, OPT_Wpedantic
,
7685 "ISO C99 does not support %<_Noreturn%>");
7687 pedwarn_c99 (loc
, OPT_Wpedantic
,
7688 "ISO C90 does not support %<_Noreturn%>");
7689 TREE_THIS_VOLATILE (decl
) = 1;
7695 /* It's a variable. */
7696 /* An uninitialized decl with `extern' is a reference. */
7697 int extern_ref
= !initialized
&& storage_class
== csc_extern
;
7699 type
= c_build_qualified_type (type
, type_quals
, orig_qual_type
,
7700 orig_qual_indirect
);
7702 /* C99 6.2.2p7: It is invalid (compile-time undefined
7703 behavior) to create an 'extern' declaration for a
7704 variable if there is a global declaration that is
7705 'static' and the global declaration is not visible.
7706 (If the static declaration _is_ currently visible,
7707 the 'extern' declaration is taken to refer to that decl.) */
7708 if (extern_ref
&& current_scope
!= file_scope
)
7710 tree global_decl
= identifier_global_value (declarator
->u
.id
.id
);
7711 tree visible_decl
= lookup_name (declarator
->u
.id
.id
);
7714 && global_decl
!= visible_decl
7715 && VAR_P (global_decl
)
7716 && !TREE_PUBLIC (global_decl
))
7717 error_at (loc
, "variable previously declared %<static%> "
7718 "redeclared %<extern%>");
7721 decl
= build_decl (declarator
->id_loc
,
7722 VAR_DECL
, declarator
->u
.id
.id
, type
);
7724 C_DECL_VARIABLE_SIZE (decl
) = 1;
7726 if (declspecs
->inline_p
)
7727 pedwarn (loc
, 0, "variable %q+D declared %<inline%>", decl
);
7728 if (declspecs
->noreturn_p
)
7729 pedwarn (loc
, 0, "variable %q+D declared %<_Noreturn%>", decl
);
7731 /* At file scope, an initialized extern declaration may follow
7732 a static declaration. In that case, DECL_EXTERNAL will be
7733 reset later in start_decl. */
7734 DECL_EXTERNAL (decl
) = (storage_class
== csc_extern
);
7736 /* At file scope, the presence of a `static' or `register' storage
7737 class specifier, or the absence of all storage class specifiers
7738 makes this declaration a definition (perhaps tentative). Also,
7739 the absence of `static' makes it public. */
7740 if (current_scope
== file_scope
)
7742 TREE_PUBLIC (decl
) = storage_class
!= csc_static
;
7743 TREE_STATIC (decl
) = !extern_ref
;
7745 /* Not at file scope, only `static' makes a static definition. */
7748 TREE_STATIC (decl
) = (storage_class
== csc_static
);
7749 TREE_PUBLIC (decl
) = extern_ref
;
7753 set_decl_tls_model (decl
, decl_default_tls_model (decl
));
7756 if ((storage_class
== csc_extern
7757 || (storage_class
== csc_none
7758 && TREE_CODE (type
) == FUNCTION_TYPE
7760 && variably_modified_type_p (type
, NULL_TREE
))
7763 if (TREE_CODE (type
) == FUNCTION_TYPE
)
7764 error_at (loc
, "non-nested function with variably modified type");
7766 error_at (loc
, "object with variably modified type must have "
7770 /* For nested functions disqualify ones taking VLAs by value
7771 from inlining since the middle-end cannot deal with this.
7772 ??? We should arrange for those to be passed by reference
7773 with emitting the copy on the caller side in the frontend. */
7774 if (storage_class
== csc_none
7775 && TREE_CODE (type
) == FUNCTION_TYPE
)
7776 for (tree al
= TYPE_ARG_TYPES (type
); al
; al
= TREE_CHAIN (al
))
7778 tree arg
= TREE_VALUE (al
);
7779 if (arg
!= error_mark_node
7780 && C_TYPE_VARIABLE_SIZE (arg
))
7782 DECL_UNINLINABLE (decl
) = 1;
7787 /* Record `register' declaration for warnings on &
7788 and in case doing stupid register allocation. */
7790 if (storage_class
== csc_register
)
7792 C_DECL_REGISTER (decl
) = 1;
7793 DECL_REGISTER (decl
) = 1;
7796 /* Record constancy and volatility. */
7797 c_apply_type_quals_to_decl (type_quals
, decl
);
7799 /* Apply _Alignas specifiers. */
7802 SET_DECL_ALIGN (decl
, alignas_align
* BITS_PER_UNIT
);
7803 DECL_USER_ALIGN (decl
) = 1;
7806 /* If a type has volatile components, it should be stored in memory.
7807 Otherwise, the fact that those components are volatile
7808 will be ignored, and would even crash the compiler.
7809 Of course, this only makes sense on VAR,PARM, and RESULT decl's. */
7810 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl
))
7811 && (VAR_P (decl
) || TREE_CODE (decl
) == PARM_DECL
7812 || TREE_CODE (decl
) == RESULT_DECL
))
7814 /* It is not an error for a structure with volatile fields to
7815 be declared register, but reset DECL_REGISTER since it
7816 cannot actually go in a register. */
7817 int was_reg
= C_DECL_REGISTER (decl
);
7818 C_DECL_REGISTER (decl
) = 0;
7819 DECL_REGISTER (decl
) = 0;
7820 c_mark_addressable (decl
);
7821 C_DECL_REGISTER (decl
) = was_reg
;
7824 /* This is the earliest point at which we might know the assembler
7825 name of a variable. Thus, if it's known before this, die horribly. */
7826 gcc_assert (!HAS_DECL_ASSEMBLER_NAME_P (decl
)
7827 || !DECL_ASSEMBLER_NAME_SET_P (decl
));
7831 && TREE_PUBLIC (decl
)
7832 && TREE_STATIC (decl
)
7833 && (RECORD_OR_UNION_TYPE_P (TREE_TYPE (decl
))
7834 || TREE_CODE (TREE_TYPE (decl
)) == ENUMERAL_TYPE
)
7835 && TYPE_NAME (TREE_TYPE (decl
)) == NULL_TREE
)
7836 warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wc___compat
,
7837 ("non-local variable %qD with anonymous type is "
7838 "questionable in C++"),
7845 /* Decode the parameter-list info for a function type or function definition.
7846 The argument is the value returned by `get_parm_info' (or made in c-parse.c
7847 if there is an identifier list instead of a parameter decl list).
7848 These two functions are separate because when a function returns
7849 or receives functions then each is called multiple times but the order
7850 of calls is different. The last call to `grokparms' is always the one
7851 that contains the formal parameter names of a function definition.
7853 Return a list of arg types to use in the FUNCTION_TYPE for this function.
7855 FUNCDEF_FLAG is true for a function definition, false for
7856 a mere declaration. A nonempty identifier-list gets an error message
7857 when FUNCDEF_FLAG is false. */
7860 grokparms (struct c_arg_info
*arg_info
, bool funcdef_flag
)
7862 tree arg_types
= arg_info
->types
;
7864 if (funcdef_flag
&& arg_info
->had_vla_unspec
)
7866 /* A function definition isn't function prototype scope C99 6.2.1p4. */
7868 error ("%<[*]%> not allowed in other than function prototype scope");
7871 if (arg_types
== NULL_TREE
&& !funcdef_flag
7872 && !in_system_header_at (input_location
))
7873 warning (OPT_Wstrict_prototypes
,
7874 "function declaration isn%'t a prototype");
7876 if (arg_types
== error_mark_node
)
7877 /* Don't set TYPE_ARG_TYPES in this case. */
7880 else if (arg_types
&& TREE_CODE (TREE_VALUE (arg_types
)) == IDENTIFIER_NODE
)
7884 pedwarn (input_location
, 0, "parameter names (without types) in "
7885 "function declaration");
7886 arg_info
->parms
= NULL_TREE
;
7889 arg_info
->parms
= arg_info
->types
;
7891 arg_info
->types
= NULL_TREE
;
7896 tree parm
, type
, typelt
;
7897 unsigned int parmno
;
7899 /* In C2X, convert () in a function definition to (void). */
7903 && !arg_info
->parms
)
7904 arg_types
= arg_info
->types
= void_list_node
;
7906 /* If there is a parameter of incomplete type in a definition,
7907 this is an error. In a declaration this is valid, and a
7908 struct or union type may be completed later, before any calls
7909 or definition of the function. In the case where the tag was
7910 first declared within the parameter list, a warning has
7911 already been given. If a parameter has void type, then
7912 however the function cannot be defined or called, so
7915 for (parm
= arg_info
->parms
, typelt
= arg_types
, parmno
= 1;
7917 parm
= DECL_CHAIN (parm
), typelt
= TREE_CHAIN (typelt
), parmno
++)
7919 type
= TREE_VALUE (typelt
);
7920 if (type
== error_mark_node
)
7923 if (!COMPLETE_TYPE_P (type
))
7927 if (DECL_NAME (parm
))
7928 error_at (input_location
,
7929 "parameter %u (%q+D) has incomplete type",
7932 error_at (DECL_SOURCE_LOCATION (parm
),
7933 "parameter %u has incomplete type",
7936 TREE_VALUE (typelt
) = error_mark_node
;
7937 TREE_TYPE (parm
) = error_mark_node
;
7938 arg_types
= NULL_TREE
;
7940 else if (VOID_TYPE_P (type
))
7942 if (DECL_NAME (parm
))
7943 warning_at (input_location
, 0,
7944 "parameter %u (%q+D) has void type",
7947 warning_at (DECL_SOURCE_LOCATION (parm
), 0,
7948 "parameter %u has void type",
7953 if (DECL_NAME (parm
) && TREE_USED (parm
))
7954 warn_if_shadowing (parm
);
7960 /* Allocate and initialize a c_arg_info structure from the parser's
7964 build_arg_info (void)
7966 struct c_arg_info
*ret
= XOBNEW (&parser_obstack
, struct c_arg_info
);
7967 ret
->parms
= NULL_TREE
;
7969 ret
->types
= NULL_TREE
;
7970 ret
->others
= NULL_TREE
;
7971 ret
->pending_sizes
= NULL
;
7972 ret
->had_vla_unspec
= 0;
7976 /* Take apart the current scope and return a c_arg_info structure with
7977 info on a parameter list just parsed.
7979 This structure is later fed to 'grokparms' and 'store_parm_decls'.
7981 ELLIPSIS being true means the argument list ended in '...' so don't
7982 append a sentinel (void_list_node) to the end of the type-list.
7984 EXPR is NULL or an expression that needs to be evaluated for the
7985 side effects of array size expressions in the parameters. */
7988 get_parm_info (bool ellipsis
, tree expr
)
7990 struct c_binding
*b
= current_scope
->bindings
;
7991 struct c_arg_info
*arg_info
= build_arg_info ();
7993 tree parms
= NULL_TREE
;
7994 vec
<c_arg_tag
, va_gc
> *tags
= NULL
;
7995 tree types
= NULL_TREE
;
7996 tree others
= NULL_TREE
;
7998 bool gave_void_only_once_err
= false;
8000 arg_info
->had_vla_unspec
= current_scope
->had_vla_unspec
;
8002 /* The bindings in this scope must not get put into a block.
8003 We will take care of deleting the binding nodes. */
8004 current_scope
->bindings
= 0;
8006 /* This function is only called if there was *something* on the
8010 /* A parameter list consisting solely of 'void' indicates that the
8011 function takes no arguments. But if the 'void' is qualified
8012 (by 'const' or 'volatile'), or has a storage class specifier
8013 ('register'), then the behavior is undefined; issue an error.
8014 Typedefs for 'void' are OK (see DR#157). */
8015 if (b
->prev
== 0 /* one binding */
8016 && TREE_CODE (b
->decl
) == PARM_DECL
/* which is a parameter */
8017 && !DECL_NAME (b
->decl
) /* anonymous */
8018 && VOID_TYPE_P (TREE_TYPE (b
->decl
))) /* of void type */
8020 if (TYPE_QUALS (TREE_TYPE (b
->decl
)) != TYPE_UNQUALIFIED
8021 || C_DECL_REGISTER (b
->decl
))
8022 error_at (b
->locus
, "%<void%> as only parameter may not be qualified");
8024 /* There cannot be an ellipsis. */
8026 error_at (b
->locus
, "%<void%> must be the only parameter");
8028 arg_info
->types
= void_list_node
;
8033 types
= void_list_node
;
8035 /* Break up the bindings list into parms, tags, types, and others;
8036 apply sanity checks; purge the name-to-decl bindings. */
8039 tree decl
= b
->decl
;
8040 tree type
= TREE_TYPE (decl
);
8042 const char *keyword
;
8044 switch (TREE_CODE (decl
))
8049 gcc_assert (I_SYMBOL_BINDING (b
->id
) == b
);
8050 I_SYMBOL_BINDING (b
->id
) = b
->shadowed
;
8053 /* Check for forward decls that never got their actual decl. */
8054 if (TREE_ASM_WRITTEN (decl
))
8056 "parameter %q+D has just a forward declaration", decl
);
8057 /* Check for (..., void, ...) and issue an error. */
8058 else if (VOID_TYPE_P (type
) && !DECL_NAME (decl
))
8060 if (!gave_void_only_once_err
)
8062 error_at (b
->locus
, "%<void%> must be the only parameter");
8063 gave_void_only_once_err
= true;
8068 /* Valid parameter, add it to the list. */
8069 DECL_CHAIN (decl
) = parms
;
8072 /* Since there is a prototype, args are passed in their
8073 declared types. The back end may override this later. */
8074 DECL_ARG_TYPE (decl
) = type
;
8075 types
= tree_cons (0, type
, types
);
8079 case ENUMERAL_TYPE
: keyword
= "enum"; goto tag
;
8080 case UNION_TYPE
: keyword
= "union"; goto tag
;
8081 case RECORD_TYPE
: keyword
= "struct"; goto tag
;
8083 /* Types may not have tag-names, in which case the type
8084 appears in the bindings list with b->id NULL. */
8087 gcc_assert (I_TAG_BINDING (b
->id
) == b
);
8088 I_TAG_BINDING (b
->id
) = b
->shadowed
;
8091 /* Warn about any struct, union or enum tags defined in a
8092 parameter list. The scope of such types is limited to
8093 the parameter list, which is rarely if ever desirable
8094 (it's impossible to call such a function with type-
8095 correct arguments). An anonymous union parm type is
8096 meaningful as a GNU extension, so don't warn for that. */
8097 if (TREE_CODE (decl
) != UNION_TYPE
|| b
->id
!= NULL_TREE
)
8100 /* The %s will be one of 'struct', 'union', or 'enum'. */
8101 warning_at (b
->locus
, 0,
8102 "%<%s %E%> declared inside parameter list"
8103 " will not be visible outside of this definition or"
8104 " declaration", keyword
, b
->id
);
8106 /* The %s will be one of 'struct', 'union', or 'enum'. */
8107 warning_at (b
->locus
, 0,
8108 "anonymous %s declared inside parameter list"
8109 " will not be visible outside of this definition or"
8110 " declaration", keyword
);
8115 vec_safe_push (tags
, tag
);
8119 /* FUNCTION_DECLs appear when there is an implicit function
8120 declaration in the parameter list. */
8121 gcc_assert (b
->nested
|| seen_error ());
8126 /* CONST_DECLs appear here when we have an embedded enum,
8127 and TYPE_DECLs appear here when we have an embedded struct
8128 or union. No warnings for this - we already warned about the
8131 /* When we reinsert this decl in the function body, we need
8132 to reconstruct whether it was marked as nested. */
8133 gcc_assert (!b
->nested
);
8134 DECL_CHAIN (decl
) = others
;
8140 /* error_mark_node appears here when we have an undeclared
8141 variable. Just throw it away. */
8144 gcc_assert (I_SYMBOL_BINDING (b
->id
) == b
);
8145 I_SYMBOL_BINDING (b
->id
) = b
->shadowed
;
8149 /* Other things that might be encountered. */
8156 b
= free_binding_and_advance (b
);
8159 arg_info
->parms
= parms
;
8160 arg_info
->tags
= tags
;
8161 arg_info
->types
= types
;
8162 arg_info
->others
= others
;
8163 arg_info
->pending_sizes
= expr
;
8167 /* Get the struct, enum or union (CODE says which) with tag NAME.
8168 Define the tag as a forward-reference with location LOC if it is
8169 not defined. HAVE_STD_ATTRS says whether any standard attributes
8170 were present after the struct, union or enum keyword; ATTRS are the
8171 standard attributes present there. Return a c_typespec structure
8172 for the type specifier. */
8175 parser_xref_tag (location_t loc
, enum tree_code code
, tree name
,
8176 bool have_std_attrs
, tree attrs
)
8178 struct c_typespec ret
;
8182 ret
.expr
= NULL_TREE
;
8183 ret
.expr_const_operands
= true;
8185 /* If a cross reference is requested, look up the type
8186 already defined for this tag and return it. */
8188 ref
= lookup_tag (code
, name
, false, &refloc
);
8189 /* If this is the right type of tag, return what we found.
8190 (This reference will be shadowed by shadow_tag later if appropriate.)
8191 If this is the wrong type of tag, do not return it. If it was the
8192 wrong type in the same scope, we will have had an error
8193 message already; if in a different scope and declaring
8194 a name, pending_xref_error will give an error message; but if in a
8195 different scope and not declaring a name, this tag should
8196 shadow the previous declaration of a different type of tag, and
8197 this would not work properly if we return the reference found.
8198 (For example, with "struct foo" in an outer scope, "union foo;"
8199 must shadow that tag with a new one of union type.) */
8201 ? (have_std_attrs
? ctsk_tagref_attrs
: ctsk_tagref
)
8202 : (have_std_attrs
? ctsk_tagfirstref_attrs
: ctsk_tagfirstref
));
8203 if (ref
&& TREE_CODE (ref
) == code
)
8205 decl_attributes (&ref
, attrs
, (int) ATTR_FLAG_TYPE_IN_PLACE
);
8206 if (C_TYPE_DEFINED_IN_STRUCT (ref
)
8207 && loc
!= UNKNOWN_LOCATION
8210 auto_diagnostic_group d
;
8214 if (warning_at (loc
, OPT_Wc___compat
,
8215 ("enum type defined in struct or union "
8216 "is not visible in C++")))
8217 inform (refloc
, "enum type defined here");
8220 if (warning_at (loc
, OPT_Wc___compat
,
8221 ("struct defined in struct or union "
8222 "is not visible in C++")))
8223 inform (refloc
, "struct defined here");
8226 if (warning_at (loc
, OPT_Wc___compat
,
8227 ("union defined in struct or union "
8228 "is not visible in C++")))
8229 inform (refloc
, "union defined here");
8240 /* If no such tag is yet defined, create a forward-reference node
8241 and record it as the "definition".
8242 When a real declaration of this type is found,
8243 the forward-reference will be altered into a real type. */
8245 ref
= make_node (code
);
8246 if (code
== ENUMERAL_TYPE
)
8248 /* Give the type a default layout like unsigned int
8249 to avoid crashing if it does not get defined. */
8250 SET_TYPE_MODE (ref
, TYPE_MODE (unsigned_type_node
));
8251 SET_TYPE_ALIGN (ref
, TYPE_ALIGN (unsigned_type_node
));
8252 TYPE_USER_ALIGN (ref
) = 0;
8253 TYPE_UNSIGNED (ref
) = 1;
8254 TYPE_PRECISION (ref
) = TYPE_PRECISION (unsigned_type_node
);
8255 TYPE_MIN_VALUE (ref
) = TYPE_MIN_VALUE (unsigned_type_node
);
8256 TYPE_MAX_VALUE (ref
) = TYPE_MAX_VALUE (unsigned_type_node
);
8259 pushtag (loc
, name
, ref
);
8260 decl_attributes (&ref
, attrs
, (int) ATTR_FLAG_TYPE_IN_PLACE
);
8266 /* Get the struct, enum or union (CODE says which) with tag NAME.
8267 Define the tag as a forward-reference if it is not defined.
8268 Return a tree for the type. */
8271 xref_tag (enum tree_code code
, tree name
)
8273 return parser_xref_tag (input_location
, code
, name
, false, NULL_TREE
).spec
;
8276 /* Make sure that the tag NAME is defined *in the current scope*
8277 at least as a forward reference.
8278 LOC is the location of the struct's definition.
8279 CODE says which kind of tag NAME ought to be.
8281 This stores the current value of the file static STRUCT_PARSE_INFO
8282 in *ENCLOSING_STRUCT_PARSE_INFO, and points STRUCT_PARSE_INFO at a
8283 new c_struct_parse_info structure. The old value of
8284 STRUCT_PARSE_INFO is restored in finish_struct. */
8287 start_struct (location_t loc
, enum tree_code code
, tree name
,
8288 class c_struct_parse_info
**enclosing_struct_parse_info
)
8290 /* If there is already a tag defined at this scope
8291 (as a forward reference), just return it. */
8293 tree ref
= NULL_TREE
;
8294 location_t refloc
= UNKNOWN_LOCATION
;
8296 if (name
!= NULL_TREE
)
8297 ref
= lookup_tag (code
, name
, true, &refloc
);
8298 if (ref
&& TREE_CODE (ref
) == code
)
8300 if (TYPE_STUB_DECL (ref
))
8301 refloc
= DECL_SOURCE_LOCATION (TYPE_STUB_DECL (ref
));
8303 if (TYPE_SIZE (ref
))
8305 auto_diagnostic_group d
;
8306 if (code
== UNION_TYPE
)
8307 error_at (loc
, "redefinition of %<union %E%>", name
);
8309 error_at (loc
, "redefinition of %<struct %E%>", name
);
8310 if (refloc
!= UNKNOWN_LOCATION
)
8311 inform (refloc
, "originally defined here");
8312 /* Don't create structures using a name already in use. */
8315 else if (C_TYPE_BEING_DEFINED (ref
))
8317 if (code
== UNION_TYPE
)
8318 error_at (loc
, "nested redefinition of %<union %E%>", name
);
8320 error_at (loc
, "nested redefinition of %<struct %E%>", name
);
8321 /* Don't bother to report "originally defined here" for a
8322 nested redefinition; the original definition should be
8324 /* Don't create structures that contain themselves. */
8329 /* Otherwise create a forward-reference just so the tag is in scope. */
8331 if (ref
== NULL_TREE
|| TREE_CODE (ref
) != code
)
8333 ref
= make_node (code
);
8334 pushtag (loc
, name
, ref
);
8337 C_TYPE_BEING_DEFINED (ref
) = 1;
8338 for (tree v
= TYPE_MAIN_VARIANT (ref
); v
; v
= TYPE_NEXT_VARIANT (v
))
8339 TYPE_PACKED (v
) = flag_pack_struct
;
8341 *enclosing_struct_parse_info
= struct_parse_info
;
8342 struct_parse_info
= new c_struct_parse_info ();
8344 /* FIXME: This will issue a warning for a use of a type defined
8345 within a statement expr used within sizeof, et. al. This is not
8346 terribly serious as C++ doesn't permit statement exprs within
8348 if (warn_cxx_compat
&& (in_sizeof
|| in_typeof
|| in_alignof
))
8349 warning_at (loc
, OPT_Wc___compat
,
8350 "defining type in %qs expression is invalid in C++",
8353 : (in_typeof
? "typeof" : "alignof")));
8358 /* Process the specs, declarator and width (NULL if omitted)
8359 of a structure component, returning a FIELD_DECL node.
8360 WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node.
8361 DECL_ATTRS is as for grokdeclarator.
8363 LOC is the location of the structure component.
8365 This is done during the parsing of the struct declaration.
8366 The FIELD_DECL nodes are chained together and the lot of them
8367 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
8370 grokfield (location_t loc
,
8371 struct c_declarator
*declarator
, struct c_declspecs
*declspecs
,
8372 tree width
, tree
*decl_attrs
)
8376 if (declarator
->kind
== cdk_id
&& declarator
->u
.id
.id
== NULL_TREE
8377 && width
== NULL_TREE
)
8379 /* This is an unnamed decl.
8381 If we have something of the form "union { list } ;" then this
8382 is the anonymous union extension. Similarly for struct.
8384 If this is something of the form "struct foo;", then
8385 If MS or Plan 9 extensions are enabled, this is handled as
8386 an anonymous struct.
8387 Otherwise this is a forward declaration of a structure tag.
8389 If this is something of the form "foo;" and foo is a TYPE_DECL, then
8390 If foo names a structure or union without a tag, then this
8391 is an anonymous struct (this is permitted by C11).
8392 If MS or Plan 9 extensions are enabled and foo names a
8393 structure, then again this is an anonymous struct.
8394 Otherwise this is an error.
8396 Oh what a horrid tangled web we weave. I wonder if MS consciously
8397 took this from Plan 9 or if it was an accident of implementation
8398 that took root before someone noticed the bug... */
8400 tree type
= declspecs
->type
;
8403 if (RECORD_OR_UNION_TYPE_P (type
)
8404 && (flag_ms_extensions
8405 || flag_plan9_extensions
8406 || !declspecs
->typedef_p
))
8408 if (flag_ms_extensions
|| flag_plan9_extensions
)
8410 else if (TYPE_NAME (type
) == NULL
)
8417 pedwarn (loc
, 0, "declaration does not declare anything");
8421 pedwarn_c99 (loc
, OPT_Wpedantic
,
8422 "ISO C99 doesn%'t support unnamed structs/unions");
8424 pedwarn_c99 (loc
, OPT_Wpedantic
,
8425 "ISO C90 doesn%'t support unnamed structs/unions");
8428 value
= grokdeclarator (declarator
, declspecs
, FIELD
, false,
8429 width
? &width
: NULL
, decl_attrs
, NULL
, NULL
,
8432 finish_decl (value
, loc
, NULL_TREE
, NULL_TREE
, NULL_TREE
);
8433 DECL_INITIAL (value
) = width
;
8435 SET_DECL_C_BIT_FIELD (value
);
8437 if (warn_cxx_compat
&& DECL_NAME (value
) != NULL_TREE
)
8439 /* If we currently have a binding for this field, set the
8440 in_struct field in the binding, so that we warn about lookups
8442 struct c_binding
*b
= I_SYMBOL_BINDING (DECL_NAME (value
));
8445 /* If the in_struct field is not yet set, push it on a list
8446 to be cleared when this struct is finished. */
8449 struct_parse_info
->fields
.safe_push (b
);
8458 /* Subroutine of detect_field_duplicates: return whether X and Y,
8459 which are both fields in the same struct, have duplicate field
8463 is_duplicate_field (tree x
, tree y
)
8465 if (DECL_NAME (x
) != NULL_TREE
&& DECL_NAME (x
) == DECL_NAME (y
))
8468 /* When using -fplan9-extensions, an anonymous field whose name is a
8469 typedef can duplicate a field name. */
8470 if (flag_plan9_extensions
8471 && (DECL_NAME (x
) == NULL_TREE
|| DECL_NAME (y
) == NULL_TREE
))
8473 tree xt
, xn
, yt
, yn
;
8476 if (DECL_NAME (x
) != NULL_TREE
)
8478 else if (RECORD_OR_UNION_TYPE_P (xt
)
8479 && TYPE_NAME (xt
) != NULL_TREE
8480 && TREE_CODE (TYPE_NAME (xt
)) == TYPE_DECL
)
8481 xn
= DECL_NAME (TYPE_NAME (xt
));
8486 if (DECL_NAME (y
) != NULL_TREE
)
8488 else if (RECORD_OR_UNION_TYPE_P (yt
)
8489 && TYPE_NAME (yt
) != NULL_TREE
8490 && TREE_CODE (TYPE_NAME (yt
)) == TYPE_DECL
)
8491 yn
= DECL_NAME (TYPE_NAME (yt
));
8495 if (xn
!= NULL_TREE
&& xn
== yn
)
8502 /* Subroutine of detect_field_duplicates: add the fields of FIELDLIST
8503 to HTAB, giving errors for any duplicates. */
8506 detect_field_duplicates_hash (tree fieldlist
,
8507 hash_table
<nofree_ptr_hash
<tree_node
> > *htab
)
8512 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
8513 if ((y
= DECL_NAME (x
)) != NULL_TREE
)
8515 slot
= htab
->find_slot (y
, INSERT
);
8518 error ("duplicate member %q+D", x
);
8519 DECL_NAME (x
) = NULL_TREE
;
8523 else if (RECORD_OR_UNION_TYPE_P (TREE_TYPE (x
)))
8525 detect_field_duplicates_hash (TYPE_FIELDS (TREE_TYPE (x
)), htab
);
8527 /* When using -fplan9-extensions, an anonymous field whose
8528 name is a typedef can duplicate a field name. */
8529 if (flag_plan9_extensions
8530 && TYPE_NAME (TREE_TYPE (x
)) != NULL_TREE
8531 && TREE_CODE (TYPE_NAME (TREE_TYPE (x
))) == TYPE_DECL
)
8533 tree xn
= DECL_NAME (TYPE_NAME (TREE_TYPE (x
)));
8534 slot
= htab
->find_slot (xn
, INSERT
);
8536 error ("duplicate member %q+D", TYPE_NAME (TREE_TYPE (x
)));
8542 /* Generate an error for any duplicate field names in FIELDLIST. Munge
8543 the list such that this does not present a problem later. */
8546 detect_field_duplicates (tree fieldlist
)
8551 /* If the struct is the list of instance variables of an Objective-C
8552 class, then we need to check all the instance variables of
8553 superclasses when checking for duplicates (since you can't have
8554 an instance variable in a subclass with the same name as an
8555 instance variable in a superclass). We pass on this job to the
8556 Objective-C compiler. objc_detect_field_duplicates() will return
8557 false if we are not checking the list of instance variables and
8558 the C frontend should proceed with the standard field duplicate
8559 checks. If we are checking the list of instance variables, the
8560 ObjC frontend will do the check, emit the errors if needed, and
8561 then return true. */
8562 if (c_dialect_objc ())
8563 if (objc_detect_field_duplicates (false))
8566 /* First, see if there are more than "a few" fields.
8567 This is trivially true if there are zero or one fields. */
8568 if (!fieldlist
|| !DECL_CHAIN (fieldlist
))
8573 if (DECL_NAME (x
) == NULL_TREE
8574 && RECORD_OR_UNION_TYPE_P (TREE_TYPE (x
)))
8577 } while (timeout
> 0 && x
);
8579 /* If there were "few" fields and no anonymous structures or unions,
8580 avoid the overhead of allocating a hash table. Instead just do
8581 the nested traversal thing. */
8584 for (x
= DECL_CHAIN (fieldlist
); x
; x
= DECL_CHAIN (x
))
8585 /* When using -fplan9-extensions, we can have duplicates
8586 between typedef names and fields. */
8588 || (flag_plan9_extensions
8589 && DECL_NAME (x
) == NULL_TREE
8590 && RECORD_OR_UNION_TYPE_P (TREE_TYPE (x
))
8591 && TYPE_NAME (TREE_TYPE (x
)) != NULL_TREE
8592 && TREE_CODE (TYPE_NAME (TREE_TYPE (x
))) == TYPE_DECL
))
8594 for (y
= fieldlist
; y
!= x
; y
= TREE_CHAIN (y
))
8595 if (is_duplicate_field (y
, x
))
8597 error ("duplicate member %q+D", x
);
8598 DECL_NAME (x
) = NULL_TREE
;
8604 hash_table
<nofree_ptr_hash
<tree_node
> > htab (37);
8605 detect_field_duplicates_hash (fieldlist
, &htab
);
8609 /* Finish up struct info used by -Wc++-compat. */
8612 warn_cxx_compat_finish_struct (tree fieldlist
, enum tree_code code
,
8613 location_t record_loc
)
8617 struct c_binding
*b
;
8619 if (fieldlist
== NULL_TREE
)
8621 if (code
== RECORD_TYPE
)
8622 warning_at (record_loc
, OPT_Wc___compat
,
8623 "empty struct has size 0 in C, size 1 in C++");
8625 warning_at (record_loc
, OPT_Wc___compat
,
8626 "empty union has size 0 in C, size 1 in C++");
8629 /* Set the C_TYPE_DEFINED_IN_STRUCT flag for each type defined in
8630 the current struct. We do this now at the end of the struct
8631 because the flag is used to issue visibility warnings, and we
8632 only want to issue those warnings if the type is referenced
8633 outside of the struct declaration. */
8634 FOR_EACH_VEC_ELT (struct_parse_info
->struct_types
, ix
, x
)
8635 C_TYPE_DEFINED_IN_STRUCT (x
) = 1;
8637 /* The TYPEDEFS_SEEN field of STRUCT_PARSE_INFO is a list of
8638 typedefs used when declaring fields in this struct. If the name
8639 of any of the fields is also a typedef name then the struct would
8640 not parse in C++, because the C++ lookup rules say that the
8641 typedef name would be looked up in the context of the struct, and
8642 would thus be the field rather than the typedef. */
8643 if (!struct_parse_info
->typedefs_seen
.is_empty ()
8644 && fieldlist
!= NULL_TREE
)
8646 /* Use a hash_set<tree> using the name of the typedef. We can use
8647 a hash_set<tree> because identifiers are interned. */
8648 hash_set
<tree
> tset
;
8650 FOR_EACH_VEC_ELT (struct_parse_info
->typedefs_seen
, ix
, x
)
8651 tset
.add (DECL_NAME (x
));
8653 for (x
= fieldlist
; x
!= NULL_TREE
; x
= DECL_CHAIN (x
))
8655 if (DECL_NAME (x
) != NULL_TREE
8656 && tset
.contains (DECL_NAME (x
)))
8658 warning_at (DECL_SOURCE_LOCATION (x
), OPT_Wc___compat
,
8659 ("using %qD as both field and typedef name is "
8662 /* FIXME: It would be nice to report the location where
8663 the typedef name is used. */
8668 /* For each field which has a binding and which was not defined in
8669 an enclosing struct, clear the in_struct field. */
8670 FOR_EACH_VEC_ELT (struct_parse_info
->fields
, ix
, b
)
8674 /* Function to help qsort sort FIELD_DECLs by name order. */
8677 field_decl_cmp (const void *x_p
, const void *y_p
)
8679 const tree
*const x
= (const tree
*) x_p
;
8680 const tree
*const y
= (const tree
*) y_p
;
8682 if (DECL_NAME (*x
) == DECL_NAME (*y
))
8683 /* A nontype is "greater" than a type. */
8684 return (TREE_CODE (*y
) == TYPE_DECL
) - (TREE_CODE (*x
) == TYPE_DECL
);
8685 if (DECL_NAME (*x
) == NULL_TREE
)
8687 if (DECL_NAME (*y
) == NULL_TREE
)
8689 if (DECL_NAME (*x
) < DECL_NAME (*y
))
8694 /* If this structure or union completes the type of any previous
8695 variable declaration, lay it out and output its rtl. */
8697 finish_incomplete_vars (tree incomplete_vars
, bool toplevel
)
8699 for (tree x
= incomplete_vars
; x
; x
= TREE_CHAIN (x
))
8701 tree decl
= TREE_VALUE (x
);
8702 if (TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
)
8703 layout_array_type (TREE_TYPE (decl
));
8704 if (TREE_CODE (decl
) != TYPE_DECL
)
8706 relayout_decl (decl
);
8707 if (c_dialect_objc ())
8708 objc_check_decl (decl
);
8709 rest_of_decl_compilation (decl
, toplevel
, 0);
8714 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
8715 LOC is the location of the RECORD_TYPE or UNION_TYPE's definition.
8716 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
8717 ATTRIBUTES are attributes to be applied to the structure.
8719 ENCLOSING_STRUCT_PARSE_INFO is the value of STRUCT_PARSE_INFO when
8720 the struct was started. */
8723 finish_struct (location_t loc
, tree t
, tree fieldlist
, tree attributes
,
8724 class c_struct_parse_info
*enclosing_struct_parse_info
)
8727 bool toplevel
= file_scope
== current_scope
;
8729 /* If this type was previously laid out as a forward reference,
8730 make sure we lay it out again. */
8732 TYPE_SIZE (t
) = NULL_TREE
;
8734 decl_attributes (&t
, attributes
, (int) ATTR_FLAG_TYPE_IN_PLACE
);
8738 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
8740 if (DECL_NAME (x
) != NULL_TREE
)
8742 if (flag_isoc11
&& RECORD_OR_UNION_TYPE_P (TREE_TYPE (x
)))
8748 if (TREE_CODE (t
) == UNION_TYPE
)
8751 pedwarn (loc
, OPT_Wpedantic
, "union has no named members");
8753 pedwarn (loc
, OPT_Wpedantic
, "union has no members");
8758 pedwarn (loc
, OPT_Wpedantic
, "struct has no named members");
8760 pedwarn (loc
, OPT_Wpedantic
, "struct has no members");
8765 /* Install struct as DECL_CONTEXT of each field decl.
8766 Also process specified field sizes, found in the DECL_INITIAL,
8767 storing 0 there after the type has been changed to precision equal
8768 to its width, rather than the precision of the specified standard
8769 type. (Correct layout requires the original type to have been preserved
8772 bool saw_named_field
= false;
8773 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
8775 if (TREE_TYPE (x
) == error_mark_node
)
8778 DECL_CONTEXT (x
) = t
;
8780 /* If any field is const, the structure type is pseudo-const. */
8781 if (TREE_READONLY (x
))
8782 C_TYPE_FIELDS_READONLY (t
) = 1;
8785 /* A field that is pseudo-const makes the structure likewise. */
8786 tree t1
= strip_array_types (TREE_TYPE (x
));
8787 if (RECORD_OR_UNION_TYPE_P (t1
) && C_TYPE_FIELDS_READONLY (t1
))
8788 C_TYPE_FIELDS_READONLY (t
) = 1;
8791 /* Any field that is volatile means variables of this type must be
8792 treated in some ways as volatile. */
8793 if (TREE_THIS_VOLATILE (x
))
8794 C_TYPE_FIELDS_VOLATILE (t
) = 1;
8796 /* Any field of nominal variable size implies structure is too. */
8797 if (C_DECL_VARIABLE_SIZE (x
))
8798 C_TYPE_VARIABLE_SIZE (t
) = 1;
8800 if (DECL_C_BIT_FIELD (x
))
8802 unsigned HOST_WIDE_INT width
= tree_to_uhwi (DECL_INITIAL (x
));
8803 DECL_SIZE (x
) = bitsize_int (width
);
8804 DECL_BIT_FIELD (x
) = 1;
8808 && (DECL_BIT_FIELD (x
)
8809 || TYPE_ALIGN (TREE_TYPE (x
)) > BITS_PER_UNIT
))
8810 DECL_PACKED (x
) = 1;
8812 /* Detect flexible array member in an invalid context. */
8813 if (TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
8814 && TYPE_SIZE (TREE_TYPE (x
)) == NULL_TREE
8815 && TYPE_DOMAIN (TREE_TYPE (x
)) != NULL_TREE
8816 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x
))) == NULL_TREE
)
8818 if (TREE_CODE (t
) == UNION_TYPE
)
8820 error_at (DECL_SOURCE_LOCATION (x
),
8821 "flexible array member in union");
8822 TREE_TYPE (x
) = error_mark_node
;
8824 else if (DECL_CHAIN (x
) != NULL_TREE
)
8826 error_at (DECL_SOURCE_LOCATION (x
),
8827 "flexible array member not at end of struct");
8828 TREE_TYPE (x
) = error_mark_node
;
8830 else if (!saw_named_field
)
8832 error_at (DECL_SOURCE_LOCATION (x
),
8833 "flexible array member in a struct with no named "
8835 TREE_TYPE (x
) = error_mark_node
;
8839 if (pedantic
&& TREE_CODE (t
) == RECORD_TYPE
8840 && flexible_array_type_p (TREE_TYPE (x
)))
8841 pedwarn (DECL_SOURCE_LOCATION (x
), OPT_Wpedantic
,
8842 "invalid use of structure with flexible array member");
8845 || RECORD_OR_UNION_TYPE_P (TREE_TYPE (x
)))
8846 saw_named_field
= true;
8849 detect_field_duplicates (fieldlist
);
8851 /* Now we have the nearly final fieldlist. Record it,
8852 then lay out the structure or union (including the fields). */
8854 TYPE_FIELDS (t
) = fieldlist
;
8856 maybe_apply_pragma_scalar_storage_order (t
);
8860 if (TYPE_SIZE_UNIT (t
)
8861 && TREE_CODE (TYPE_SIZE_UNIT (t
)) == INTEGER_CST
8862 && !TREE_OVERFLOW (TYPE_SIZE_UNIT (t
))
8863 && !valid_constant_size_p (TYPE_SIZE_UNIT (t
)))
8864 error ("type %qT is too large", t
);
8866 /* Give bit-fields their proper types and rewrite the type of array fields
8867 with scalar component if the enclosing type has reverse storage order. */
8868 for (tree field
= fieldlist
; field
; field
= DECL_CHAIN (field
))
8870 if (TREE_CODE (field
) == FIELD_DECL
8871 && DECL_INITIAL (field
)
8872 && TREE_TYPE (field
) != error_mark_node
)
8874 unsigned HOST_WIDE_INT width
8875 = tree_to_uhwi (DECL_INITIAL (field
));
8876 tree type
= TREE_TYPE (field
);
8877 if (width
!= TYPE_PRECISION (type
))
8880 = c_build_bitfield_integer_type (width
, TYPE_UNSIGNED (type
));
8881 SET_DECL_MODE (field
, TYPE_MODE (TREE_TYPE (field
)));
8883 DECL_INITIAL (field
) = NULL_TREE
;
8885 else if (TYPE_REVERSE_STORAGE_ORDER (t
)
8886 && TREE_CODE (field
) == FIELD_DECL
8887 && TREE_CODE (TREE_TYPE (field
)) == ARRAY_TYPE
)
8889 tree ftype
= TREE_TYPE (field
);
8890 tree ctype
= strip_array_types (ftype
);
8891 if (!RECORD_OR_UNION_TYPE_P (ctype
) && TYPE_MODE (ctype
) != QImode
)
8893 tree fmain_type
= TYPE_MAIN_VARIANT (ftype
);
8894 tree
*typep
= &fmain_type
;
8896 *typep
= build_distinct_type_copy (*typep
);
8897 TYPE_REVERSE_STORAGE_ORDER (*typep
) = 1;
8898 typep
= &TREE_TYPE (*typep
);
8899 } while (TREE_CODE (*typep
) == ARRAY_TYPE
);
8901 = c_build_qualified_type (fmain_type
, TYPE_QUALS (ftype
));
8905 /* Warn on problematic type punning for storage order purposes. */
8906 if (TREE_CODE (t
) == UNION_TYPE
8907 && TREE_CODE (field
) == FIELD_DECL
8908 && AGGREGATE_TYPE_P (TREE_TYPE (field
)))
8910 tree ftype
= TREE_TYPE (field
);
8911 if (TREE_CODE (ftype
) == ARRAY_TYPE
)
8912 ftype
= strip_array_types (ftype
);
8913 if (RECORD_OR_UNION_TYPE_P (ftype
)
8914 && TYPE_REVERSE_STORAGE_ORDER (ftype
)
8915 != TYPE_REVERSE_STORAGE_ORDER (t
))
8916 warning_at (DECL_SOURCE_LOCATION (field
),
8917 OPT_Wscalar_storage_order
,
8918 "type punning toggles scalar storage order");
8922 /* Now we have the truly final field list.
8923 Store it in this type and in the variants. */
8925 TYPE_FIELDS (t
) = fieldlist
;
8927 /* If there are lots of fields, sort so we can look through them fast.
8928 We arbitrarily consider 16 or more elts to be "a lot". */
8933 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
8935 if (len
> 15 || DECL_NAME (x
) == NULL
)
8943 struct lang_type
*space
;
8944 struct sorted_fields_type
*space2
;
8946 len
+= list_length (x
);
8948 /* Use the same allocation policy here that make_node uses, to
8949 ensure that this lives as long as the rest of the struct decl.
8950 All decls in an inline function need to be saved. */
8952 space
= ggc_cleared_alloc
<struct lang_type
> ();
8953 space2
= (sorted_fields_type
*) ggc_internal_alloc
8954 (sizeof (struct sorted_fields_type
) + len
* sizeof (tree
));
8958 field_array
= &space2
->elts
[0];
8959 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
8961 field_array
[len
++] = x
;
8963 /* If there is anonymous struct or union, break out of the loop. */
8964 if (DECL_NAME (x
) == NULL
)
8967 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
8970 TYPE_LANG_SPECIFIC (t
) = space
;
8971 TYPE_LANG_SPECIFIC (t
)->s
->len
= len
;
8972 field_array
= TYPE_LANG_SPECIFIC (t
)->s
->elts
;
8973 qsort (field_array
, len
, sizeof (tree
), field_decl_cmp
);
8978 /* If this was supposed to be a transparent union, but we can't
8979 make it one, warn and turn off the flag. */
8980 if (TREE_CODE (t
) == UNION_TYPE
8981 && TYPE_TRANSPARENT_AGGR (t
)
8982 && (!TYPE_FIELDS (t
) || TYPE_MODE (t
) != DECL_MODE (TYPE_FIELDS (t
))))
8984 TYPE_TRANSPARENT_AGGR (t
) = 0;
8985 warning_at (loc
, 0, "union cannot be made transparent");
8988 tree incomplete_vars
= C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t
));
8989 for (x
= TYPE_MAIN_VARIANT (t
); x
; x
= TYPE_NEXT_VARIANT (x
))
8991 TYPE_FIELDS (x
) = TYPE_FIELDS (t
);
8992 TYPE_LANG_SPECIFIC (x
) = TYPE_LANG_SPECIFIC (t
);
8993 TYPE_TRANSPARENT_AGGR (x
) = TYPE_TRANSPARENT_AGGR (t
);
8994 C_TYPE_FIELDS_READONLY (x
) = C_TYPE_FIELDS_READONLY (t
);
8995 C_TYPE_FIELDS_VOLATILE (x
) = C_TYPE_FIELDS_VOLATILE (t
);
8996 C_TYPE_VARIABLE_SIZE (x
) = C_TYPE_VARIABLE_SIZE (t
);
8997 C_TYPE_INCOMPLETE_VARS (x
) = NULL_TREE
;
9000 /* Update type location to the one of the definition, instead of e.g.
9001 a forward declaration. */
9002 if (TYPE_STUB_DECL (t
))
9003 DECL_SOURCE_LOCATION (TYPE_STUB_DECL (t
)) = loc
;
9005 /* Finish debugging output for this type. */
9006 rest_of_type_compilation (t
, toplevel
);
9008 finish_incomplete_vars (incomplete_vars
, toplevel
);
9010 /* If we're inside a function proper, i.e. not file-scope and not still
9011 parsing parameters, then arrange for the size of a variable sized type
9013 if (building_stmt_list_p () && variably_modified_type_p (t
, NULL_TREE
))
9014 add_stmt (build_stmt (loc
,
9015 DECL_EXPR
, build_decl (loc
, TYPE_DECL
, NULL
, t
)));
9017 if (warn_cxx_compat
)
9018 warn_cxx_compat_finish_struct (fieldlist
, TREE_CODE (t
), loc
);
9020 delete struct_parse_info
;
9022 struct_parse_info
= enclosing_struct_parse_info
;
9024 /* If this struct is defined inside a struct, add it to
9027 && struct_parse_info
!= NULL
9028 && !in_sizeof
&& !in_typeof
&& !in_alignof
)
9029 struct_parse_info
->struct_types
.safe_push (t
);
9035 gt_pointer_operator new_value
;
9039 /* This routine compares two fields like field_decl_cmp but using the
9040 pointer operator in resort_data. */
9043 resort_field_decl_cmp (const void *x_p
, const void *y_p
)
9045 const tree
*const x
= (const tree
*) x_p
;
9046 const tree
*const y
= (const tree
*) y_p
;
9048 if (DECL_NAME (*x
) == DECL_NAME (*y
))
9049 /* A nontype is "greater" than a type. */
9050 return (TREE_CODE (*y
) == TYPE_DECL
) - (TREE_CODE (*x
) == TYPE_DECL
);
9051 if (DECL_NAME (*x
) == NULL_TREE
)
9053 if (DECL_NAME (*y
) == NULL_TREE
)
9056 tree d1
= DECL_NAME (*x
);
9057 tree d2
= DECL_NAME (*y
);
9058 resort_data
.new_value (&d1
, &d1
, resort_data
.cookie
);
9059 resort_data
.new_value (&d2
, &d2
, resort_data
.cookie
);
9066 /* Resort DECL_SORTED_FIELDS because pointers have been reordered. */
9069 resort_sorted_fields (void *obj
,
9070 void * ARG_UNUSED (orig_obj
),
9071 gt_pointer_operator new_value
,
9074 struct sorted_fields_type
*sf
= (struct sorted_fields_type
*) obj
;
9075 resort_data
.new_value
= new_value
;
9076 resort_data
.cookie
= cookie
;
9077 qsort (&sf
->elts
[0], sf
->len
, sizeof (tree
),
9078 resort_field_decl_cmp
);
9081 /* Lay out the type T, and its element type, and so on. */
9084 layout_array_type (tree t
)
9086 if (TREE_CODE (TREE_TYPE (t
)) == ARRAY_TYPE
)
9087 layout_array_type (TREE_TYPE (t
));
9091 /* Begin compiling the definition of an enumeration type.
9092 NAME is its name (or null if anonymous).
9093 LOC is the enum's location.
9094 Returns the type object, as yet incomplete.
9095 Also records info about it so that build_enumerator
9096 may be used to declare the individual values as they are read. */
9099 start_enum (location_t loc
, struct c_enum_contents
*the_enum
, tree name
)
9101 tree enumtype
= NULL_TREE
;
9102 location_t enumloc
= UNKNOWN_LOCATION
;
9104 /* If this is the real definition for a previous forward reference,
9105 fill in the contents in the same object that used to be the
9106 forward reference. */
9108 if (name
!= NULL_TREE
)
9109 enumtype
= lookup_tag (ENUMERAL_TYPE
, name
, true, &enumloc
);
9111 if (enumtype
== NULL_TREE
|| TREE_CODE (enumtype
) != ENUMERAL_TYPE
)
9113 enumtype
= make_node (ENUMERAL_TYPE
);
9114 pushtag (loc
, name
, enumtype
);
9116 /* Update type location to the one of the definition, instead of e.g.
9117 a forward declaration. */
9118 else if (TYPE_STUB_DECL (enumtype
))
9120 enumloc
= DECL_SOURCE_LOCATION (TYPE_STUB_DECL (enumtype
));
9121 DECL_SOURCE_LOCATION (TYPE_STUB_DECL (enumtype
)) = loc
;
9124 if (C_TYPE_BEING_DEFINED (enumtype
))
9125 error_at (loc
, "nested redefinition of %<enum %E%>", name
);
9127 C_TYPE_BEING_DEFINED (enumtype
) = 1;
9129 if (TYPE_VALUES (enumtype
) != NULL_TREE
)
9131 /* This enum is a named one that has been declared already. */
9132 auto_diagnostic_group d
;
9133 error_at (loc
, "redeclaration of %<enum %E%>", name
);
9134 if (enumloc
!= UNKNOWN_LOCATION
)
9135 inform (enumloc
, "originally defined here");
9137 /* Completely replace its old definition.
9138 The old enumerators remain defined, however. */
9139 TYPE_VALUES (enumtype
) = NULL_TREE
;
9142 the_enum
->enum_next_value
= integer_zero_node
;
9143 the_enum
->enum_overflow
= 0;
9145 if (flag_short_enums
)
9146 for (tree v
= TYPE_MAIN_VARIANT (enumtype
); v
; v
= TYPE_NEXT_VARIANT (v
))
9147 TYPE_PACKED (v
) = 1;
9149 /* FIXME: This will issue a warning for a use of a type defined
9150 within sizeof in a statement expr. This is not terribly serious
9151 as C++ doesn't permit statement exprs within sizeof anyhow. */
9152 if (warn_cxx_compat
&& (in_sizeof
|| in_typeof
|| in_alignof
))
9153 warning_at (loc
, OPT_Wc___compat
,
9154 "defining type in %qs expression is invalid in C++",
9157 : (in_typeof
? "typeof" : "alignof")));
9162 /* After processing and defining all the values of an enumeration type,
9163 install their decls in the enumeration type and finish it off.
9164 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
9165 and ATTRIBUTES are the specified attributes.
9166 Returns ENUMTYPE. */
9169 finish_enum (tree enumtype
, tree values
, tree attributes
)
9172 tree minnode
= NULL_TREE
, maxnode
= NULL_TREE
;
9175 bool toplevel
= (file_scope
== current_scope
);
9176 struct lang_type
*lt
;
9178 decl_attributes (&enumtype
, attributes
, (int) ATTR_FLAG_TYPE_IN_PLACE
);
9180 /* Calculate the maximum value of any enumerator in this type. */
9182 if (values
== error_mark_node
)
9183 minnode
= maxnode
= integer_zero_node
;
9186 minnode
= maxnode
= TREE_VALUE (values
);
9187 for (pair
= TREE_CHAIN (values
); pair
; pair
= TREE_CHAIN (pair
))
9189 tree value
= TREE_VALUE (pair
);
9190 if (tree_int_cst_lt (maxnode
, value
))
9192 if (tree_int_cst_lt (value
, minnode
))
9197 /* Construct the final type of this enumeration. It is the same
9198 as one of the integral types - the narrowest one that fits, except
9199 that normally we only go as narrow as int - and signed iff any of
9200 the values are negative. */
9201 sign
= (tree_int_cst_sgn (minnode
) >= 0) ? UNSIGNED
: SIGNED
;
9202 precision
= MAX (tree_int_cst_min_precision (minnode
, sign
),
9203 tree_int_cst_min_precision (maxnode
, sign
));
9205 /* If the precision of the type was specified with an attribute and it
9206 was too small, give an error. Otherwise, use it. */
9207 if (TYPE_PRECISION (enumtype
) && lookup_attribute ("mode", attributes
))
9209 if (precision
> TYPE_PRECISION (enumtype
))
9211 TYPE_PRECISION (enumtype
) = 0;
9212 error ("specified mode too small for enumerated values");
9215 precision
= TYPE_PRECISION (enumtype
);
9218 TYPE_PRECISION (enumtype
) = 0;
9220 if (TYPE_PACKED (enumtype
)
9221 || precision
> TYPE_PRECISION (integer_type_node
)
9222 || TYPE_PRECISION (enumtype
))
9224 tem
= c_common_type_for_size (precision
, sign
== UNSIGNED
? 1 : 0);
9227 warning (0, "enumeration values exceed range of largest integer");
9228 tem
= long_long_integer_type_node
;
9232 tem
= sign
== UNSIGNED
? unsigned_type_node
: integer_type_node
;
9234 TYPE_MIN_VALUE (enumtype
) = TYPE_MIN_VALUE (tem
);
9235 TYPE_MAX_VALUE (enumtype
) = TYPE_MAX_VALUE (tem
);
9236 TYPE_UNSIGNED (enumtype
) = TYPE_UNSIGNED (tem
);
9237 SET_TYPE_ALIGN (enumtype
, TYPE_ALIGN (tem
));
9238 TYPE_SIZE (enumtype
) = NULL_TREE
;
9239 TYPE_PRECISION (enumtype
) = TYPE_PRECISION (tem
);
9241 layout_type (enumtype
);
9243 if (values
!= error_mark_node
)
9245 /* Change the type of the enumerators to be the enum type. We
9246 need to do this irrespective of the size of the enum, for
9247 proper type checking. Replace the DECL_INITIALs of the
9248 enumerators, and the value slots of the list, with copies
9249 that have the enum type; they cannot be modified in place
9250 because they may be shared (e.g. integer_zero_node) Finally,
9251 change the purpose slots to point to the names of the decls. */
9252 for (pair
= values
; pair
; pair
= TREE_CHAIN (pair
))
9254 tree enu
= TREE_PURPOSE (pair
);
9255 tree ini
= DECL_INITIAL (enu
);
9257 TREE_TYPE (enu
) = enumtype
;
9259 /* The ISO C Standard mandates enumerators to have type int,
9260 even though the underlying type of an enum type is
9261 unspecified. However, GCC allows enumerators of any
9262 integer type as an extensions. build_enumerator()
9263 converts any enumerators that fit in an int to type int,
9264 to avoid promotions to unsigned types when comparing
9265 integers with enumerators that fit in the int range.
9266 When -pedantic is given, build_enumerator() would have
9267 already warned about those that don't fit. Here we
9268 convert the rest to the enumerator type. */
9269 if (TREE_TYPE (ini
) != integer_type_node
)
9270 ini
= convert (enumtype
, ini
);
9272 DECL_INITIAL (enu
) = ini
;
9273 TREE_PURPOSE (pair
) = DECL_NAME (enu
);
9274 /* To match the C++ FE, store the CONST_DECL rather than just its
9276 TREE_VALUE (pair
) = enu
;
9279 TYPE_VALUES (enumtype
) = values
;
9282 /* Record the min/max values so that we can warn about bit-field
9283 enumerations that are too small for the values. */
9284 lt
= ggc_cleared_alloc
<struct lang_type
> ();
9285 lt
->enum_min
= minnode
;
9286 lt
->enum_max
= maxnode
;
9287 TYPE_LANG_SPECIFIC (enumtype
) = lt
;
9289 /* Fix up all variant types of this enum type. */
9290 tree incomplete_vars
= C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (enumtype
));
9291 for (tem
= TYPE_MAIN_VARIANT (enumtype
); tem
; tem
= TYPE_NEXT_VARIANT (tem
))
9293 C_TYPE_INCOMPLETE_VARS (tem
) = NULL_TREE
;
9294 if (tem
== enumtype
)
9296 TYPE_VALUES (tem
) = TYPE_VALUES (enumtype
);
9297 TYPE_MIN_VALUE (tem
) = TYPE_MIN_VALUE (enumtype
);
9298 TYPE_MAX_VALUE (tem
) = TYPE_MAX_VALUE (enumtype
);
9299 TYPE_SIZE (tem
) = TYPE_SIZE (enumtype
);
9300 TYPE_SIZE_UNIT (tem
) = TYPE_SIZE_UNIT (enumtype
);
9301 SET_TYPE_MODE (tem
, TYPE_MODE (enumtype
));
9302 TYPE_PRECISION (tem
) = TYPE_PRECISION (enumtype
);
9303 SET_TYPE_ALIGN (tem
, TYPE_ALIGN (enumtype
));
9304 TYPE_USER_ALIGN (tem
) = TYPE_USER_ALIGN (enumtype
);
9305 TYPE_UNSIGNED (tem
) = TYPE_UNSIGNED (enumtype
);
9306 TYPE_LANG_SPECIFIC (tem
) = TYPE_LANG_SPECIFIC (enumtype
);
9309 /* Finish debugging output for this type. */
9310 rest_of_type_compilation (enumtype
, toplevel
);
9312 finish_incomplete_vars (incomplete_vars
, toplevel
);
9314 /* If this enum is defined inside a struct, add it to
9317 && struct_parse_info
!= NULL
9318 && !in_sizeof
&& !in_typeof
&& !in_alignof
)
9319 struct_parse_info
->struct_types
.safe_push (enumtype
);
9321 C_TYPE_BEING_DEFINED (enumtype
) = 0;
9326 /* Build and install a CONST_DECL for one value of the
9327 current enumeration type (one that was begun with start_enum).
9328 DECL_LOC is the location of the enumerator.
9329 LOC is the location of the '=' operator if any, DECL_LOC otherwise.
9330 Return a tree-list containing the CONST_DECL and its value.
9331 Assignment of sequential values by default is handled here. */
9334 build_enumerator (location_t decl_loc
, location_t loc
,
9335 struct c_enum_contents
*the_enum
, tree name
, tree value
)
9339 /* Validate and default VALUE. */
9341 if (value
!= NULL_TREE
)
9343 /* Don't issue more errors for error_mark_node (i.e. an
9344 undeclared identifier) - just ignore the value expression. */
9345 if (value
== error_mark_node
)
9347 else if (!INTEGRAL_TYPE_P (TREE_TYPE (value
)))
9349 error_at (loc
, "enumerator value for %qE is not an integer constant",
9355 if (TREE_CODE (value
) != INTEGER_CST
)
9357 value
= c_fully_fold (value
, false, NULL
);
9358 if (TREE_CODE (value
) == INTEGER_CST
)
9359 pedwarn (loc
, OPT_Wpedantic
,
9360 "enumerator value for %qE is not an integer "
9361 "constant expression", name
);
9363 if (TREE_CODE (value
) != INTEGER_CST
)
9365 error ("enumerator value for %qE is not an integer constant",
9371 value
= default_conversion (value
);
9372 constant_expression_warning (value
);
9377 /* Default based on previous value. */
9378 /* It should no longer be possible to have NON_LVALUE_EXPR
9380 if (value
== NULL_TREE
)
9382 value
= the_enum
->enum_next_value
;
9383 if (the_enum
->enum_overflow
)
9384 error_at (loc
, "overflow in enumeration values");
9386 /* Even though the underlying type of an enum is unspecified, the
9387 type of enumeration constants is explicitly defined as int
9388 (6.4.4.3/2 in the C99 Standard). GCC allows any integer type as
9390 else if (!int_fits_type_p (value
, integer_type_node
))
9391 pedwarn (loc
, OPT_Wpedantic
,
9392 "ISO C restricts enumerator values to range of %<int%>");
9394 /* The ISO C Standard mandates enumerators to have type int, even
9395 though the underlying type of an enum type is unspecified.
9396 However, GCC allows enumerators of any integer type as an
9397 extensions. Here we convert any enumerators that fit in an int
9398 to type int, to avoid promotions to unsigned types when comparing
9399 integers with enumerators that fit in the int range. When
9400 -pedantic is given, we would have already warned about those that
9401 don't fit. We have to do this here rather than in finish_enum
9402 because this value may be used to define more enumerators. */
9403 if (int_fits_type_p (value
, integer_type_node
))
9404 value
= convert (integer_type_node
, value
);
9406 /* Set basis for default for next value. */
9407 the_enum
->enum_next_value
9408 = build_binary_op (EXPR_LOC_OR_LOC (value
, input_location
),
9409 PLUS_EXPR
, value
, integer_one_node
, false);
9410 the_enum
->enum_overflow
= tree_int_cst_lt (the_enum
->enum_next_value
, value
);
9412 /* Now create a declaration for the enum value name. */
9414 type
= TREE_TYPE (value
);
9415 type
= c_common_type_for_size (MAX (TYPE_PRECISION (type
),
9416 TYPE_PRECISION (integer_type_node
)),
9417 (TYPE_PRECISION (type
)
9418 >= TYPE_PRECISION (integer_type_node
)
9419 && TYPE_UNSIGNED (type
)));
9421 decl
= build_decl (decl_loc
, CONST_DECL
, name
, type
);
9422 DECL_INITIAL (decl
) = convert (type
, value
);
9425 return tree_cons (decl
, value
, NULL_TREE
);
9428 /* Implement LANG_HOOKS_SIMULATE_ENUM_DECL. */
9431 c_simulate_enum_decl (location_t loc
, const char *name
,
9432 vec
<string_int_pair
> *values_ptr
)
9434 location_t saved_loc
= input_location
;
9435 input_location
= loc
;
9437 struct c_enum_contents the_enum
;
9438 tree enumtype
= start_enum (loc
, &the_enum
, get_identifier (name
));
9440 tree value_chain
= NULL_TREE
;
9441 string_int_pair
*value
;
9442 vec
<string_int_pair
> values
= *values_ptr
;
9444 FOR_EACH_VEC_ELT (values
, i
, value
)
9446 tree decl
= build_enumerator (loc
, loc
, &the_enum
,
9447 get_identifier (value
->first
),
9448 build_int_cst (integer_type_node
,
9450 TREE_CHAIN (decl
) = value_chain
;
9454 finish_enum (enumtype
, nreverse (value_chain
), NULL_TREE
);
9456 input_location
= saved_loc
;
9460 /* Implement LANG_HOOKS_SIMULATE_RECORD_DECL. */
9463 c_simulate_record_decl (location_t loc
, const char *name
,
9464 array_slice
<const tree
> fields
)
9466 location_t saved_loc
= input_location
;
9467 input_location
= loc
;
9469 class c_struct_parse_info
*struct_info
;
9470 tree ident
= get_identifier (name
);
9471 tree type
= start_struct (loc
, RECORD_TYPE
, ident
, &struct_info
);
9473 for (unsigned int i
= 0; i
< fields
.size (); ++i
)
9475 DECL_FIELD_CONTEXT (fields
[i
]) = type
;
9477 DECL_CHAIN (fields
[i
- 1]) = fields
[i
];
9480 finish_struct (loc
, type
, fields
[0], NULL_TREE
, struct_info
);
9482 tree decl
= build_decl (loc
, TYPE_DECL
, ident
, type
);
9483 set_underlying_type (decl
);
9484 lang_hooks
.decls
.pushdecl (decl
);
9486 input_location
= saved_loc
;
9490 /* Create the FUNCTION_DECL for a function definition.
9491 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
9492 the declaration; they describe the function's name and the type it returns,
9493 but twisted together in a fashion that parallels the syntax of C.
9495 This function creates a binding context for the function body
9496 as well as setting up the FUNCTION_DECL in current_function_decl.
9498 Returns true on success. If the DECLARATOR is not suitable for a function
9499 (it defines a datum instead), we return false to report a parse error. */
9502 start_function (struct c_declspecs
*declspecs
, struct c_declarator
*declarator
,
9505 tree decl1
, old_decl
;
9506 tree restype
, resdecl
;
9509 current_function_returns_value
= 0; /* Assume, until we see it does. */
9510 current_function_returns_null
= 0;
9511 current_function_returns_abnormally
= 0;
9512 warn_about_return_type
= 0;
9513 c_switch_stack
= NULL
;
9515 /* Indicate no valid break/continue context. */
9518 decl1
= grokdeclarator (declarator
, declspecs
, FUNCDEF
, true, NULL
,
9519 &attributes
, NULL
, NULL
, DEPRECATED_NORMAL
);
9520 invoke_plugin_callbacks (PLUGIN_START_PARSE_FUNCTION
, decl1
);
9522 /* If the declarator is not suitable for a function definition,
9523 cause a syntax error. */
9524 if (decl1
== NULL_TREE
9525 || TREE_CODE (decl1
) != FUNCTION_DECL
)
9528 loc
= DECL_SOURCE_LOCATION (decl1
);
9530 /* A nested function is not global. */
9531 if (current_function_decl
!= NULL_TREE
)
9532 TREE_PUBLIC (decl1
) = 0;
9534 c_decl_attributes (&decl1
, attributes
, 0);
9536 if (DECL_DECLARED_INLINE_P (decl1
)
9537 && DECL_UNINLINABLE (decl1
)
9538 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1
)))
9539 warning_at (loc
, OPT_Wattributes
,
9540 "inline function %qD given attribute %qs",
9543 /* Handle gnu_inline attribute. */
9544 if (declspecs
->inline_p
9545 && !flag_gnu89_inline
9546 && TREE_CODE (decl1
) == FUNCTION_DECL
9547 && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl1
))
9548 || current_function_decl
))
9550 if (declspecs
->storage_class
!= csc_static
)
9551 DECL_EXTERNAL (decl1
) = !DECL_EXTERNAL (decl1
);
9554 announce_function (decl1
);
9556 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1
))))
9558 error_at (loc
, "return type is an incomplete type");
9559 /* Make it return void instead. */
9561 = build_function_type (void_type_node
,
9562 TYPE_ARG_TYPES (TREE_TYPE (decl1
)));
9565 if (warn_about_return_type
)
9566 warn_defaults_to (loc
, flag_isoc99
? OPT_Wimplicit_int
9567 : (warn_return_type
> 0 ? OPT_Wreturn_type
9568 : OPT_Wimplicit_int
),
9569 "return type defaults to %<int%>");
9571 /* Make the init_value nonzero so pushdecl knows this is not tentative.
9572 error_mark_node is replaced below (in pop_scope) with the BLOCK. */
9573 DECL_INITIAL (decl1
) = error_mark_node
;
9575 /* If this definition isn't a prototype and we had a prototype declaration
9576 before, copy the arg type info from that prototype. */
9577 old_decl
= lookup_name_in_scope (DECL_NAME (decl1
), current_scope
);
9578 if (old_decl
&& TREE_CODE (old_decl
) != FUNCTION_DECL
)
9579 old_decl
= NULL_TREE
;
9581 current_function_prototype_locus
= UNKNOWN_LOCATION
;
9582 current_function_prototype_built_in
= false;
9583 current_function_prototype_arg_types
= NULL_TREE
;
9584 tree newtype
= TREE_TYPE (decl1
);
9585 tree oldtype
= old_decl
? TREE_TYPE (old_decl
) : newtype
;
9586 if (!prototype_p (newtype
))
9588 tree oldrt
= TREE_TYPE (oldtype
);
9589 tree newrt
= TREE_TYPE (newtype
);
9590 if (old_decl
!= NULL_TREE
9591 && TREE_CODE (oldtype
) == FUNCTION_TYPE
9592 && comptypes (oldrt
, newrt
))
9594 if (stdarg_p (oldtype
))
9596 auto_diagnostic_group d
;
9597 warning_at (loc
, 0, "%q+D defined as variadic function "
9598 "without prototype", decl1
);
9599 locate_old_decl (old_decl
);
9601 TREE_TYPE (decl1
) = composite_type (oldtype
, newtype
);
9602 current_function_prototype_locus
= DECL_SOURCE_LOCATION (old_decl
);
9603 current_function_prototype_built_in
9604 = C_DECL_BUILTIN_PROTOTYPE (old_decl
);
9605 current_function_prototype_arg_types
9606 = TYPE_ARG_TYPES (newtype
);
9608 if (TREE_PUBLIC (decl1
))
9610 /* If there is an external prototype declaration of this
9611 function, record its location but do not copy information
9612 to this decl. This may be an invisible declaration
9613 (built-in or in a scope which has finished) or simply
9614 have more refined argument types than any declaration
9616 struct c_binding
*b
;
9617 for (b
= I_SYMBOL_BINDING (DECL_NAME (decl1
)); b
; b
= b
->shadowed
)
9618 if (B_IN_SCOPE (b
, external_scope
))
9622 tree ext_decl
, ext_type
;
9624 ext_type
= b
->u
.type
? b
->u
.type
: TREE_TYPE (ext_decl
);
9625 if (TREE_CODE (ext_type
) == FUNCTION_TYPE
9626 && comptypes (TREE_TYPE (TREE_TYPE (decl1
)),
9627 TREE_TYPE (ext_type
)))
9629 current_function_prototype_locus
9630 = DECL_SOURCE_LOCATION (ext_decl
);
9631 current_function_prototype_built_in
9632 = C_DECL_BUILTIN_PROTOTYPE (ext_decl
);
9633 current_function_prototype_arg_types
9634 = TYPE_ARG_TYPES (ext_type
);
9640 /* Optionally warn of old-fashioned def with no previous prototype. */
9641 if (warn_strict_prototypes
9642 && old_decl
!= error_mark_node
9643 && !prototype_p (TREE_TYPE (decl1
))
9644 && C_DECL_ISNT_PROTOTYPE (old_decl
))
9645 warning_at (loc
, OPT_Wstrict_prototypes
,
9646 "function declaration isn%'t a prototype");
9647 /* Optionally warn of any global def with no previous prototype. */
9648 else if (warn_missing_prototypes
9649 && old_decl
!= error_mark_node
9650 && TREE_PUBLIC (decl1
)
9651 && !MAIN_NAME_P (DECL_NAME (decl1
))
9652 && C_DECL_ISNT_PROTOTYPE (old_decl
)
9653 && !DECL_DECLARED_INLINE_P (decl1
))
9654 warning_at (loc
, OPT_Wmissing_prototypes
,
9655 "no previous prototype for %qD", decl1
);
9656 /* Optionally warn of any def with no previous prototype
9657 if the function has already been used. */
9658 else if (warn_missing_prototypes
9659 && old_decl
!= NULL_TREE
9660 && old_decl
!= error_mark_node
9661 && TREE_USED (old_decl
)
9662 && !prototype_p (TREE_TYPE (old_decl
)))
9663 warning_at (loc
, OPT_Wmissing_prototypes
,
9664 "%qD was used with no prototype before its definition", decl1
);
9665 /* Optionally warn of any global def with no previous declaration. */
9666 else if (warn_missing_declarations
9667 && TREE_PUBLIC (decl1
)
9668 && old_decl
== NULL_TREE
9669 && !MAIN_NAME_P (DECL_NAME (decl1
))
9670 && !DECL_DECLARED_INLINE_P (decl1
))
9671 warning_at (loc
, OPT_Wmissing_declarations
,
9672 "no previous declaration for %qD",
9674 /* Optionally warn of any def with no previous declaration
9675 if the function has already been used. */
9676 else if (warn_missing_declarations
9677 && old_decl
!= NULL_TREE
9678 && old_decl
!= error_mark_node
9679 && TREE_USED (old_decl
)
9680 && C_DECL_IMPLICIT (old_decl
))
9681 warning_at (loc
, OPT_Wmissing_declarations
,
9682 "%qD was used with no declaration before its definition", decl1
);
9684 /* This function exists in static storage.
9685 (This does not mean `static' in the C sense!) */
9686 TREE_STATIC (decl1
) = 1;
9688 /* This is the earliest point at which we might know the assembler
9689 name of the function. Thus, if it's set before this, die horribly. */
9690 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl1
));
9692 /* If #pragma weak was used, mark the decl weak now. */
9693 if (current_scope
== file_scope
)
9694 maybe_apply_pragma_weak (decl1
);
9696 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
9697 if (warn_main
&& MAIN_NAME_P (DECL_NAME (decl1
)))
9699 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1
)))
9700 != integer_type_node
)
9701 pedwarn (loc
, OPT_Wmain
, "return type of %qD is not %<int%>", decl1
);
9702 else if (TYPE_ATOMIC (TREE_TYPE (TREE_TYPE (decl1
))))
9703 pedwarn (loc
, OPT_Wmain
, "%<_Atomic%>-qualified return type of %qD",
9706 check_main_parameter_types (decl1
);
9708 if (!TREE_PUBLIC (decl1
))
9709 pedwarn (loc
, OPT_Wmain
,
9710 "%qD is normally a non-static function", decl1
);
9713 tree parms
= current_function_arg_info
->parms
;
9716 location_t origloc
= DECL_SOURCE_LOCATION (old_decl
);
9717 warn_parm_array_mismatch (origloc
, old_decl
, parms
);
9720 /* Record the decl so that the function name is defined.
9721 If we already have a decl for this name, and it is a FUNCTION_DECL,
9722 use the old decl. */
9724 current_function_decl
= pushdecl (decl1
);
9726 if (tree access
= build_attr_access_from_parms (parms
, false))
9727 decl_attributes (¤t_function_decl
, access
, ATTR_FLAG_INTERNAL
,
9731 declare_parm_level ();
9733 restype
= TREE_TYPE (TREE_TYPE (current_function_decl
));
9734 resdecl
= build_decl (loc
, RESULT_DECL
, NULL_TREE
, restype
);
9735 DECL_ARTIFICIAL (resdecl
) = 1;
9736 DECL_IGNORED_P (resdecl
) = 1;
9737 DECL_RESULT (current_function_decl
) = resdecl
;
9739 start_fname_decls ();
9744 /* Subroutine of store_parm_decls which handles new-style function
9745 definitions (prototype format). The parms already have decls, so we
9746 need only record them as in effect and complain if any redundant
9747 old-style parm decls were written. */
9749 store_parm_decls_newstyle (tree fndecl
, const struct c_arg_info
*arg_info
)
9755 if (current_scope
->bindings
)
9757 error_at (DECL_SOURCE_LOCATION (fndecl
),
9758 "old-style parameter declarations in prototyped "
9759 "function definition");
9761 /* Get rid of the old-style declarations. */
9765 /* Don't issue this warning for nested functions, and don't issue this
9766 warning if we got here because ARG_INFO_TYPES was error_mark_node
9767 (this happens when a function definition has just an ellipsis in
9768 its parameter list). */
9769 else if (!in_system_header_at (input_location
)
9770 && !current_function_scope
9771 && arg_info
->types
!= error_mark_node
)
9772 warning_at (DECL_SOURCE_LOCATION (fndecl
), OPT_Wtraditional
,
9773 "traditional C rejects ISO C style function definitions");
9775 /* Now make all the parameter declarations visible in the function body.
9776 We can bypass most of the grunt work of pushdecl. */
9777 for (decl
= arg_info
->parms
; decl
; decl
= DECL_CHAIN (decl
))
9779 DECL_CONTEXT (decl
) = current_function_decl
;
9780 if (DECL_NAME (decl
))
9782 bind (DECL_NAME (decl
), decl
, current_scope
,
9783 /*invisible=*/false, /*nested=*/false,
9785 if (!TREE_USED (decl
))
9786 warn_if_shadowing (decl
);
9789 pedwarn_c11 (DECL_SOURCE_LOCATION (decl
), OPT_Wpedantic
,
9790 "ISO C does not support omitting parameter names in "
9791 "function definitions before C2X");
9794 /* Record the parameter list in the function declaration. */
9795 DECL_ARGUMENTS (fndecl
) = arg_info
->parms
;
9797 /* Now make all the ancillary declarations visible, likewise. */
9798 for (decl
= arg_info
->others
; decl
; decl
= DECL_CHAIN (decl
))
9800 DECL_CONTEXT (decl
) = current_function_decl
;
9801 if (DECL_NAME (decl
))
9802 bind (DECL_NAME (decl
), decl
, current_scope
,
9803 /*invisible=*/false,
9804 /*nested=*/(TREE_CODE (decl
) == FUNCTION_DECL
),
9808 /* And all the tag declarations. */
9809 FOR_EACH_VEC_SAFE_ELT_REVERSE (arg_info
->tags
, ix
, tag
)
9811 bind (tag
->id
, tag
->type
, current_scope
,
9812 /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION
);
9815 /* Subroutine of store_parm_decls which handles old-style function
9816 definitions (separate parameter list and declarations). */
9819 store_parm_decls_oldstyle (tree fndecl
, const struct c_arg_info
*arg_info
)
9821 struct c_binding
*b
;
9822 tree parm
, decl
, last
;
9823 tree parmids
= arg_info
->parms
;
9824 hash_set
<tree
> seen_args
;
9826 if (!in_system_header_at (input_location
))
9829 pedwarn (DECL_SOURCE_LOCATION (fndecl
),
9830 OPT_Wold_style_definition
, "old-style function definition");
9832 warning_at (DECL_SOURCE_LOCATION (fndecl
),
9833 OPT_Wold_style_definition
,
9834 "old-style function definition");
9837 if (current_scope
->had_vla_unspec
)
9838 error ("%<[*]%> not allowed in other than function prototype scope");
9840 /* Match each formal parameter name with its declaration. Save each
9841 decl in the appropriate TREE_PURPOSE slot of the parmids chain. */
9842 for (parm
= parmids
; parm
; parm
= TREE_CHAIN (parm
))
9844 if (TREE_VALUE (parm
) == NULL_TREE
)
9846 error_at (DECL_SOURCE_LOCATION (fndecl
),
9847 "parameter name missing from parameter list");
9848 TREE_PURPOSE (parm
) = NULL_TREE
;
9852 b
= I_SYMBOL_BINDING (TREE_VALUE (parm
));
9853 if (b
&& B_IN_CURRENT_SCOPE (b
))
9856 /* Skip erroneous parameters. */
9857 if (decl
== error_mark_node
)
9859 /* If we got something other than a PARM_DECL it is an error. */
9860 if (TREE_CODE (decl
) != PARM_DECL
)
9862 error_at (DECL_SOURCE_LOCATION (decl
),
9863 "%qD declared as a non-parameter", decl
);
9866 /* If the declaration is already marked, we have a duplicate
9867 name. Complain and ignore the duplicate. */
9868 else if (seen_args
.contains (decl
))
9870 error_at (DECL_SOURCE_LOCATION (decl
),
9871 "multiple parameters named %qD", decl
);
9872 TREE_PURPOSE (parm
) = NULL_TREE
;
9875 /* If the declaration says "void", complain and turn it into
9877 else if (VOID_TYPE_P (TREE_TYPE (decl
)))
9879 error_at (DECL_SOURCE_LOCATION (decl
),
9880 "parameter %qD declared with void type", decl
);
9881 TREE_TYPE (decl
) = integer_type_node
;
9882 DECL_ARG_TYPE (decl
) = integer_type_node
;
9883 layout_decl (decl
, 0);
9885 warn_if_shadowing (decl
);
9887 /* If no declaration found, default to int. */
9890 /* FIXME diagnostics: This should be the location of the argument,
9891 not the FNDECL. E.g., for an old-style declaration
9893 int f10(v) { blah; }
9895 We should use the location of the V, not the F10.
9896 Unfortunately, the V is an IDENTIFIER_NODE which has no
9897 location. In the future we need locations for c_arg_info
9900 See gcc.dg/Wshadow-3.c for an example of this problem. */
9901 decl
= build_decl (DECL_SOURCE_LOCATION (fndecl
),
9902 PARM_DECL
, TREE_VALUE (parm
), integer_type_node
);
9903 DECL_ARG_TYPE (decl
) = TREE_TYPE (decl
);
9905 warn_if_shadowing (decl
);
9908 pedwarn (DECL_SOURCE_LOCATION (decl
),
9909 OPT_Wimplicit_int
, "type of %qD defaults to %<int%>",
9912 warning_at (DECL_SOURCE_LOCATION (decl
),
9913 OPT_Wmissing_parameter_type
,
9914 "type of %qD defaults to %<int%>", decl
);
9917 TREE_PURPOSE (parm
) = decl
;
9918 seen_args
.add (decl
);
9921 /* Now examine the parms chain for incomplete declarations
9922 and declarations with no corresponding names. */
9924 for (b
= current_scope
->bindings
; b
; b
= b
->prev
)
9927 if (TREE_CODE (parm
) != PARM_DECL
)
9930 if (TREE_TYPE (parm
) != error_mark_node
9931 && !COMPLETE_TYPE_P (TREE_TYPE (parm
)))
9933 error_at (DECL_SOURCE_LOCATION (parm
),
9934 "parameter %qD has incomplete type", parm
);
9935 TREE_TYPE (parm
) = error_mark_node
;
9938 if (!seen_args
.contains (parm
))
9940 error_at (DECL_SOURCE_LOCATION (parm
),
9941 "declaration for parameter %qD but no such parameter",
9944 /* Pretend the parameter was not missing.
9945 This gets us to a standard state and minimizes
9946 further error messages. */
9947 parmids
= chainon (parmids
, tree_cons (parm
, 0, 0));
9951 /* Chain the declarations together in the order of the list of
9952 names. Store that chain in the function decl, replacing the
9953 list of names. Update the current scope to match. */
9954 DECL_ARGUMENTS (fndecl
) = NULL_TREE
;
9956 for (parm
= parmids
; parm
; parm
= TREE_CHAIN (parm
))
9957 if (TREE_PURPOSE (parm
))
9959 if (parm
&& TREE_PURPOSE (parm
))
9961 last
= TREE_PURPOSE (parm
);
9962 DECL_ARGUMENTS (fndecl
) = last
;
9964 for (parm
= TREE_CHAIN (parm
); parm
; parm
= TREE_CHAIN (parm
))
9965 if (TREE_PURPOSE (parm
))
9967 DECL_CHAIN (last
) = TREE_PURPOSE (parm
);
9968 last
= TREE_PURPOSE (parm
);
9970 DECL_CHAIN (last
) = NULL_TREE
;
9973 /* If there was a previous prototype,
9974 set the DECL_ARG_TYPE of each argument according to
9975 the type previously specified, and report any mismatches. */
9977 if (current_function_prototype_arg_types
)
9980 for (parm
= DECL_ARGUMENTS (fndecl
),
9981 type
= current_function_prototype_arg_types
;
9982 parm
|| (type
!= NULL_TREE
9983 && TREE_VALUE (type
) != error_mark_node
9984 && TYPE_MAIN_VARIANT (TREE_VALUE (type
)) != void_type_node
);
9985 parm
= DECL_CHAIN (parm
), type
= TREE_CHAIN (type
))
9987 if (parm
== NULL_TREE
9988 || type
== NULL_TREE
9989 || (TREE_VALUE (type
) != error_mark_node
9990 && TYPE_MAIN_VARIANT (TREE_VALUE (type
)) == void_type_node
))
9992 if (current_function_prototype_built_in
)
9993 warning_at (DECL_SOURCE_LOCATION (fndecl
),
9994 0, "number of arguments doesn%'t match "
9995 "built-in prototype");
9998 /* FIXME diagnostics: This should be the location of
9999 FNDECL, but there is bug when a prototype is
10000 declared inside function context, but defined
10001 outside of it (e.g., gcc.dg/pr15698-2.c). In
10002 which case FNDECL gets the location of the
10003 prototype, not the definition. */
10004 error_at (input_location
,
10005 "number of arguments doesn%'t match prototype");
10007 error_at (current_function_prototype_locus
,
10008 "prototype declaration");
10012 /* Type for passing arg must be consistent with that
10013 declared for the arg. ISO C says we take the unqualified
10014 type for parameters declared with qualified type. */
10015 if (TREE_TYPE (parm
) != error_mark_node
10016 && TREE_VALUE (type
) != error_mark_node
10017 && ((TYPE_ATOMIC (DECL_ARG_TYPE (parm
))
10018 != TYPE_ATOMIC (TREE_VALUE (type
)))
10019 || !comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm
)),
10020 TYPE_MAIN_VARIANT (TREE_VALUE (type
)))))
10022 if ((TYPE_ATOMIC (DECL_ARG_TYPE (parm
))
10023 == TYPE_ATOMIC (TREE_VALUE (type
)))
10024 && (TYPE_MAIN_VARIANT (TREE_TYPE (parm
))
10025 == TYPE_MAIN_VARIANT (TREE_VALUE (type
))))
10027 /* Adjust argument to match prototype. E.g. a previous
10028 `int foo(float);' prototype causes
10029 `int foo(x) float x; {...}' to be treated like
10030 `int foo(float x) {...}'. This is particularly
10031 useful for argument types like uid_t. */
10032 DECL_ARG_TYPE (parm
) = TREE_TYPE (parm
);
10034 if (targetm
.calls
.promote_prototypes (TREE_TYPE (current_function_decl
))
10035 && INTEGRAL_TYPE_P (TREE_TYPE (parm
))
10036 && (TYPE_PRECISION (TREE_TYPE (parm
))
10037 < TYPE_PRECISION (integer_type_node
)))
10038 DECL_ARG_TYPE (parm
)
10039 = c_type_promotes_to (TREE_TYPE (parm
));
10041 /* ??? Is it possible to get here with a
10042 built-in prototype or will it always have
10043 been diagnosed as conflicting with an
10044 old-style definition and discarded? */
10045 if (current_function_prototype_built_in
)
10046 warning_at (DECL_SOURCE_LOCATION (parm
),
10047 OPT_Wpedantic
, "promoted argument %qD "
10048 "doesn%'t match built-in prototype", parm
);
10051 pedwarn (DECL_SOURCE_LOCATION (parm
),
10052 OPT_Wpedantic
, "promoted argument %qD "
10053 "doesn%'t match prototype", parm
);
10054 pedwarn (current_function_prototype_locus
, OPT_Wpedantic
,
10055 "prototype declaration");
10060 if (current_function_prototype_built_in
)
10061 warning_at (DECL_SOURCE_LOCATION (parm
),
10062 0, "argument %qD doesn%'t match "
10063 "built-in prototype", parm
);
10066 error_at (DECL_SOURCE_LOCATION (parm
),
10067 "argument %qD doesn%'t match prototype", parm
);
10068 error_at (current_function_prototype_locus
,
10069 "prototype declaration");
10074 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl
)) = NULL_TREE
;
10077 /* Otherwise, create a prototype that would match. */
10081 tree actual
= NULL_TREE
, last
= NULL_TREE
, type
;
10083 for (parm
= DECL_ARGUMENTS (fndecl
); parm
; parm
= DECL_CHAIN (parm
))
10085 type
= tree_cons (NULL_TREE
, DECL_ARG_TYPE (parm
), NULL_TREE
);
10087 TREE_CHAIN (last
) = type
;
10092 type
= tree_cons (NULL_TREE
, void_type_node
, NULL_TREE
);
10094 TREE_CHAIN (last
) = type
;
10098 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
10099 of the type of this function, but we need to avoid having this
10100 affect the types of other similarly-typed functions, so we must
10101 first force the generation of an identical (but separate) type
10102 node for the relevant function type. The new node we create
10103 will be a variant of the main variant of the original function
10106 TREE_TYPE (fndecl
) = build_variant_type_copy (TREE_TYPE (fndecl
));
10108 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl
)) = actual
;
10112 /* Store parameter declarations passed in ARG_INFO into the current
10113 function declaration. */
10116 store_parm_decls_from (struct c_arg_info
*arg_info
)
10118 current_function_arg_info
= arg_info
;
10119 store_parm_decls ();
10122 /* Called by walk_tree to look for and update context-less labels
10123 or labels with context in the parent function. */
10126 set_labels_context_r (tree
*tp
, int *walk_subtrees
, void *data
)
10128 tree ctx
= static_cast<tree
>(data
);
10129 if (TREE_CODE (*tp
) == LABEL_EXPR
10130 && (DECL_CONTEXT (LABEL_EXPR_LABEL (*tp
)) == NULL_TREE
10131 || DECL_CONTEXT (LABEL_EXPR_LABEL (*tp
)) == DECL_CONTEXT (ctx
)))
10133 DECL_CONTEXT (LABEL_EXPR_LABEL (*tp
)) = ctx
;
10134 *walk_subtrees
= 0;
10140 /* Store the parameter declarations into the current function declaration.
10141 This is called after parsing the parameter declarations, before
10142 digesting the body of the function.
10144 For an old-style definition, construct a prototype out of the old-style
10145 parameter declarations and inject it into the function's type. */
10148 store_parm_decls (void)
10150 tree fndecl
= current_function_decl
;
10153 /* The argument information block for FNDECL. */
10154 struct c_arg_info
*arg_info
= current_function_arg_info
;
10155 current_function_arg_info
= 0;
10157 /* True if this definition is written with a prototype. In C2X, an
10158 empty argument list was converted to (void) in grokparms; in
10159 older C standard versions, it does not give the function a type
10160 with a prototype for future calls. */
10161 proto
= arg_info
->types
!= 0;
10164 store_parm_decls_newstyle (fndecl
, arg_info
);
10166 store_parm_decls_oldstyle (fndecl
, arg_info
);
10168 /* The next call to push_scope will be a function body. */
10170 next_is_function_body
= true;
10172 /* Write a record describing this function definition to the prototypes
10173 file (if requested). */
10175 gen_aux_info_record (fndecl
, 1, 0, proto
);
10177 /* Initialize the RTL code for the function. */
10178 allocate_struct_function (fndecl
, false);
10180 if (warn_unused_local_typedefs
)
10181 cfun
->language
= ggc_cleared_alloc
<language_function
> ();
10183 /* Begin the statement tree for this function. */
10184 DECL_SAVED_TREE (fndecl
) = push_stmt_list ();
10186 /* ??? Insert the contents of the pending sizes list into the function
10187 to be evaluated. The only reason left to have this is
10188 void foo(int n, int array[n++])
10189 because we throw away the array type in favor of a pointer type, and
10190 thus won't naturally see the SAVE_EXPR containing the increment. All
10191 other pending sizes would be handled by gimplify_parameters. */
10192 if (arg_info
->pending_sizes
)
10194 /* In very special circumstances, e.g. for code like
10196 void f (int a[i += 2]) {}
10197 we need to execute the atomic assignment on function entry.
10198 But in this case, it is not just a straight store, it has the
10199 op= form, which means that build_atomic_assign has generated
10200 gotos, labels, etc. Because at that time the function decl
10201 for F has not been created yet, those labels do not have any
10202 function context. But we have the fndecl now, so update the
10203 labels accordingly. gimplify_expr would crash otherwise.
10204 Or with nested functions the labels could be created with parent
10205 function's context, while when the statement is emitted at the
10206 start of the nested function, it needs the nested function's
10208 walk_tree_without_duplicates (&arg_info
->pending_sizes
,
10209 set_labels_context_r
, fndecl
);
10210 add_stmt (arg_info
->pending_sizes
);
10214 /* Store PARM_DECLs in PARMS into scope temporarily. Used for
10215 c_finish_omp_declare_simd for function prototypes. No diagnostics
10219 temp_store_parm_decls (tree fndecl
, tree parms
)
10222 for (tree p
= parms
; p
; p
= DECL_CHAIN (p
))
10224 DECL_CONTEXT (p
) = fndecl
;
10226 bind (DECL_NAME (p
), p
, current_scope
,
10227 /*invisible=*/false, /*nested=*/false,
10232 /* Undo what temp_store_parm_decls did. */
10235 temp_pop_parm_decls (void)
10237 /* Clear all bindings in this temporary scope, so that
10238 pop_scope doesn't create a BLOCK. */
10239 struct c_binding
*b
= current_scope
->bindings
;
10240 current_scope
->bindings
= NULL
;
10241 for (; b
; b
= free_binding_and_advance (b
))
10243 gcc_assert (TREE_CODE (b
->decl
) == PARM_DECL
10244 || b
->decl
== error_mark_node
);
10245 gcc_assert (I_SYMBOL_BINDING (b
->id
) == b
);
10246 I_SYMBOL_BINDING (b
->id
) = b
->shadowed
;
10247 if (b
->shadowed
&& b
->shadowed
->u
.type
)
10248 TREE_TYPE (b
->shadowed
->decl
) = b
->shadowed
->u
.type
;
10254 /* Finish up a function declaration and compile that function
10255 all the way to assembler language output. Then free the storage
10256 for the function definition.
10258 This is called after parsing the body of the function definition. */
10261 finish_function (location_t end_loc
)
10263 tree fndecl
= current_function_decl
;
10265 if (c_dialect_objc ())
10266 objc_finish_function ();
10268 if (TREE_CODE (fndecl
) == FUNCTION_DECL
10269 && targetm
.calls
.promote_prototypes (TREE_TYPE (fndecl
)))
10271 tree args
= DECL_ARGUMENTS (fndecl
);
10272 for (; args
; args
= DECL_CHAIN (args
))
10274 tree type
= TREE_TYPE (args
);
10275 if (INTEGRAL_TYPE_P (type
)
10276 && TYPE_PRECISION (type
) < TYPE_PRECISION (integer_type_node
))
10277 DECL_ARG_TYPE (args
) = c_type_promotes_to (type
);
10281 if (DECL_INITIAL (fndecl
) && DECL_INITIAL (fndecl
) != error_mark_node
)
10282 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl
)) = fndecl
;
10284 /* Must mark the RESULT_DECL as being in this function. */
10286 if (DECL_RESULT (fndecl
) && DECL_RESULT (fndecl
) != error_mark_node
)
10287 DECL_CONTEXT (DECL_RESULT (fndecl
)) = fndecl
;
10289 if (MAIN_NAME_P (DECL_NAME (fndecl
)) && flag_hosted
10290 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl
)))
10291 == integer_type_node
&& flag_isoc99
)
10293 /* Hack. We don't want the middle-end to warn that this return
10294 is unreachable, so we mark its location as special. Using
10295 UNKNOWN_LOCATION has the problem that it gets clobbered in
10296 annotate_one_with_locus. A cleaner solution might be to
10297 ensure ! should_carry_locus_p (stmt), but that needs a flag.
10299 c_finish_return (BUILTINS_LOCATION
, integer_zero_node
, NULL_TREE
);
10302 /* Tie off the statement tree for this function. */
10303 DECL_SAVED_TREE (fndecl
) = pop_stmt_list (DECL_SAVED_TREE (fndecl
));
10305 finish_fname_decls ();
10307 /* Complain if there's no return statement only if option specified on
10309 if (warn_return_type
> 0
10310 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl
))) != VOID_TYPE
10311 && !current_function_returns_value
&& !current_function_returns_null
10312 /* Don't complain if we are no-return. */
10313 && !current_function_returns_abnormally
10314 /* Don't complain if we are declared noreturn. */
10315 && !TREE_THIS_VOLATILE (fndecl
)
10316 /* Don't warn for main(). */
10317 && !MAIN_NAME_P (DECL_NAME (fndecl
))
10318 /* Or if they didn't actually specify a return type. */
10319 && !C_FUNCTION_IMPLICIT_INT (fndecl
)
10320 /* Normally, with -Wreturn-type, flow will complain, but we might
10321 optimize out static functions. */
10322 && !TREE_PUBLIC (fndecl
)
10323 && targetm
.warn_func_return (fndecl
)
10324 && warning (OPT_Wreturn_type
,
10325 "no return statement in function returning non-void"))
10326 suppress_warning (fndecl
, OPT_Wreturn_type
);
10328 /* Complain about parameters that are only set, but never otherwise used. */
10329 if (warn_unused_but_set_parameter
)
10333 for (decl
= DECL_ARGUMENTS (fndecl
);
10335 decl
= DECL_CHAIN (decl
))
10336 if (TREE_USED (decl
)
10337 && TREE_CODE (decl
) == PARM_DECL
10338 && !DECL_READ_P (decl
)
10339 && DECL_NAME (decl
)
10340 && !DECL_ARTIFICIAL (decl
)
10341 && !warning_suppressed_p (decl
, OPT_Wunused_but_set_parameter
))
10342 warning_at (DECL_SOURCE_LOCATION (decl
),
10343 OPT_Wunused_but_set_parameter
,
10344 "parameter %qD set but not used", decl
);
10347 /* Complain about locally defined typedefs that are not used in this
10349 maybe_warn_unused_local_typedefs ();
10351 /* Possibly warn about unused parameters. */
10352 if (warn_unused_parameter
)
10353 do_warn_unused_parameter (fndecl
);
10355 /* Store the end of the function, so that we get good line number
10356 info for the epilogue. */
10357 cfun
->function_end_locus
= end_loc
;
10359 /* Finalize the ELF visibility for the function. */
10360 c_determine_visibility (fndecl
);
10362 /* For GNU C extern inline functions disregard inline limits. */
10363 if (DECL_EXTERNAL (fndecl
)
10364 && DECL_DECLARED_INLINE_P (fndecl
)
10365 && (flag_gnu89_inline
10366 || lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (fndecl
))))
10367 DECL_DISREGARD_INLINE_LIMITS (fndecl
) = 1;
10369 /* Genericize before inlining. Delay genericizing nested functions
10370 until their parent function is genericized. Since finalizing
10371 requires GENERIC, delay that as well. */
10373 if (DECL_INITIAL (fndecl
) && DECL_INITIAL (fndecl
) != error_mark_node
10374 && !undef_nested_function
)
10376 if (!decl_function_context (fndecl
))
10378 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE
, fndecl
);
10379 c_genericize (fndecl
);
10381 /* ??? Objc emits functions after finalizing the compilation unit.
10382 This should be cleaned up later and this conditional removed. */
10383 if (symtab
->global_info_ready
)
10385 cgraph_node::add_new_function (fndecl
, false);
10388 cgraph_node::finalize_function (fndecl
, false);
10392 /* Register this function with cgraph just far enough to get it
10393 added to our parent's nested function list. Handy, since the
10394 C front end doesn't have such a list. */
10395 (void) cgraph_node::get_create (fndecl
);
10399 if (!decl_function_context (fndecl
))
10400 undef_nested_function
= false;
10402 if (cfun
->language
!= NULL
)
10404 ggc_free (cfun
->language
);
10405 cfun
->language
= NULL
;
10408 /* We're leaving the context of this function, so zap cfun.
10409 It's still in DECL_STRUCT_FUNCTION, and we'll restore it in
10410 tree_rest_of_compilation. */
10412 invoke_plugin_callbacks (PLUGIN_FINISH_PARSE_FUNCTION
, current_function_decl
);
10413 current_function_decl
= NULL
;
10416 /* Check the declarations given in a for-loop for satisfying the C99
10417 constraints. If exactly one such decl is found, return it. LOC is
10418 the location of the opening parenthesis of the for loop. The last
10419 parameter allows you to control the "for loop initial declarations
10420 are only allowed in C99 mode". Normally, you should pass
10421 flag_isoc99 as that parameter. But in some cases (Objective-C
10422 foreach loop, for example) we want to run the checks in this
10423 function even if not in C99 mode, so we allow the caller to turn
10424 off the error about not being in C99 mode.
10428 check_for_loop_decls (location_t loc
, bool turn_off_iso_c99_error
)
10430 struct c_binding
*b
;
10431 tree one_decl
= NULL_TREE
;
10434 if (!turn_off_iso_c99_error
)
10436 static bool hint
= true;
10437 /* If we get here, declarations have been used in a for loop without
10438 the C99 for loop scope. This doesn't make much sense, so don't
10440 auto_diagnostic_group d
;
10441 error_at (loc
, "%<for%> loop initial declarations "
10442 "are only allowed in C99 or C11 mode");
10446 "use option %<-std=c99%>, %<-std=gnu99%>, %<-std=c11%> or "
10447 "%<-std=gnu11%> to compile your code");
10453 pedwarn_c90 (loc
, OPT_Wpedantic
, "ISO C90 does not support %<for%> loop "
10454 "initial declarations");
10456 /* C99 subclause 6.8.5 paragraph 3:
10458 [#3] The declaration part of a for statement shall only
10459 declare identifiers for objects having storage class auto or
10462 It isn't clear whether, in this sentence, "identifiers" binds to
10463 "shall only declare" or to "objects" - that is, whether all identifiers
10464 declared must be identifiers for objects, or whether the restriction
10465 only applies to those that are. (A question on this in comp.std.c
10466 in November 2000 received no answer.) We implement the strictest
10467 interpretation, to avoid creating an extension which later causes
10470 for (b
= current_scope
->bindings
; b
; b
= b
->prev
)
10473 tree decl
= b
->decl
;
10478 switch (TREE_CODE (decl
))
10482 location_t decl_loc
= DECL_SOURCE_LOCATION (decl
);
10483 if (TREE_STATIC (decl
))
10484 error_at (decl_loc
,
10485 "declaration of static variable %qD in %<for%> loop "
10486 "initial declaration", decl
);
10487 else if (DECL_EXTERNAL (decl
))
10488 error_at (decl_loc
,
10489 "declaration of %<extern%> variable %qD in %<for%> loop "
10490 "initial declaration", decl
);
10496 "%<struct %E%> declared in %<for%> loop initial "
10497 "declaration", id
);
10501 "%<union %E%> declared in %<for%> loop initial declaration",
10504 case ENUMERAL_TYPE
:
10505 error_at (loc
, "%<enum %E%> declared in %<for%> loop "
10506 "initial declaration", id
);
10509 error_at (loc
, "declaration of non-variable "
10510 "%qD in %<for%> loop initial declaration", decl
);
10517 return n_decls
== 1 ? one_decl
: NULL_TREE
;
10520 /* Save and reinitialize the variables
10521 used during compilation of a C function. */
10524 c_push_function_context (void)
10526 struct language_function
*p
= cfun
->language
;
10527 /* cfun->language might have been already allocated by the use of
10528 -Wunused-local-typedefs. In that case, just re-use it. */
10530 cfun
->language
= p
= ggc_cleared_alloc
<language_function
> ();
10532 p
->base
.x_stmt_tree
= c_stmt_tree
;
10533 c_stmt_tree
.x_cur_stmt_list
= vec_safe_copy (c_stmt_tree
.x_cur_stmt_list
);
10534 p
->x_in_statement
= in_statement
;
10535 p
->x_switch_stack
= c_switch_stack
;
10536 p
->arg_info
= current_function_arg_info
;
10537 p
->returns_value
= current_function_returns_value
;
10538 p
->returns_null
= current_function_returns_null
;
10539 p
->returns_abnormally
= current_function_returns_abnormally
;
10540 p
->warn_about_return_type
= warn_about_return_type
;
10542 push_function_context ();
10545 /* Restore the variables used during compilation of a C function. */
10548 c_pop_function_context (void)
10550 struct language_function
*p
;
10552 pop_function_context ();
10553 p
= cfun
->language
;
10555 /* When -Wunused-local-typedefs is in effect, cfun->languages is
10556 used to store data throughout the life time of the current cfun,
10557 So don't deallocate it. */
10558 if (!warn_unused_local_typedefs
)
10559 cfun
->language
= NULL
;
10561 if (DECL_STRUCT_FUNCTION (current_function_decl
) == 0
10562 && DECL_SAVED_TREE (current_function_decl
) == NULL_TREE
)
10564 /* Stop pointing to the local nodes about to be freed. */
10565 /* But DECL_INITIAL must remain nonzero so we know this
10566 was an actual function definition. */
10567 DECL_INITIAL (current_function_decl
) = error_mark_node
;
10568 DECL_ARGUMENTS (current_function_decl
) = NULL_TREE
;
10571 c_stmt_tree
= p
->base
.x_stmt_tree
;
10572 p
->base
.x_stmt_tree
.x_cur_stmt_list
= NULL
;
10573 in_statement
= p
->x_in_statement
;
10574 c_switch_stack
= p
->x_switch_stack
;
10575 current_function_arg_info
= p
->arg_info
;
10576 current_function_returns_value
= p
->returns_value
;
10577 current_function_returns_null
= p
->returns_null
;
10578 current_function_returns_abnormally
= p
->returns_abnormally
;
10579 warn_about_return_type
= p
->warn_about_return_type
;
10582 /* The functions below are required for functionality of doing
10583 function at once processing in the C front end. Currently these
10584 functions are not called from anywhere in the C front end, but as
10585 these changes continue, that will change. */
10587 /* Returns the stmt_tree (if any) to which statements are currently
10588 being added. If there is no active statement-tree, NULL is
10592 current_stmt_tree (void)
10594 return &c_stmt_tree
;
10597 /* Return the global value of T as a symbol. */
10600 identifier_global_value (tree t
)
10602 struct c_binding
*b
;
10604 for (b
= I_SYMBOL_BINDING (t
); b
; b
= b
->shadowed
)
10605 if (B_IN_FILE_SCOPE (b
) || B_IN_EXTERNAL_SCOPE (b
))
10611 /* Return the global value of tag T as a symbol. */
10614 identifier_global_tag (tree t
)
10616 struct c_binding
*b
;
10618 for (b
= I_TAG_BINDING (t
); b
; b
= b
->shadowed
)
10619 if (B_IN_FILE_SCOPE (b
) || B_IN_EXTERNAL_SCOPE (b
))
10625 /* Returns true if NAME refers to a built-in function or function-like
10629 names_builtin_p (const char *name
)
10631 tree id
= get_identifier (name
);
10632 if (tree decl
= identifier_global_value (id
))
10633 return TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_IS_UNDECLARED_BUILTIN (decl
);
10635 /* Also detect common reserved C words that aren't strictly built-in
10637 switch (C_RID_CODE (id
))
10639 case RID_BUILTIN_CONVERTVECTOR
:
10640 case RID_BUILTIN_HAS_ATTRIBUTE
:
10641 case RID_BUILTIN_SHUFFLE
:
10642 case RID_BUILTIN_SHUFFLEVECTOR
:
10643 case RID_BUILTIN_ASSOC_BARRIER
:
10644 case RID_CHOOSE_EXPR
:
10646 case RID_TYPES_COMPATIBLE_P
:
10655 /* In C, the only C-linkage public declaration is at file scope. */
10658 c_linkage_bindings (tree name
)
10660 return identifier_global_value (name
);
10663 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
10664 otherwise the name is found in ridpointers from RID_INDEX. */
10667 record_builtin_type (enum rid rid_index
, const char *name
, tree type
)
10671 id
= ridpointers
[(int) rid_index
];
10673 id
= get_identifier (name
);
10674 decl
= build_decl (UNKNOWN_LOCATION
, TYPE_DECL
, id
, type
);
10676 if (debug_hooks
->type_decl
)
10677 debug_hooks
->type_decl (decl
, false);
10680 /* Build the void_list_node (void_type_node having been created). */
10682 build_void_list_node (void)
10684 tree t
= build_tree_list (NULL_TREE
, void_type_node
);
10688 /* Return a c_parm structure with the given SPECS, ATTRS and DECLARATOR. */
10691 build_c_parm (struct c_declspecs
*specs
, tree attrs
,
10692 struct c_declarator
*declarator
,
10695 struct c_parm
*ret
= XOBNEW (&parser_obstack
, struct c_parm
);
10696 ret
->specs
= specs
;
10697 ret
->attrs
= attrs
;
10698 ret
->declarator
= declarator
;
10703 /* Return a declarator with nested attributes. TARGET is the inner
10704 declarator to which these attributes apply. ATTRS are the
10707 struct c_declarator
*
10708 build_attrs_declarator (tree attrs
, struct c_declarator
*target
)
10710 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
10711 ret
->kind
= cdk_attrs
;
10712 ret
->declarator
= target
;
10713 ret
->u
.attrs
= attrs
;
10717 /* Return a declarator for a function with arguments specified by ARGS
10718 and return type specified by TARGET. */
10720 struct c_declarator
*
10721 build_function_declarator (struct c_arg_info
*args
,
10722 struct c_declarator
*target
)
10724 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
10725 ret
->kind
= cdk_function
;
10726 ret
->declarator
= target
;
10727 ret
->u
.arg_info
= args
;
10731 /* Return a declarator for the identifier IDENT (which may be
10732 NULL_TREE for an abstract declarator). */
10734 struct c_declarator
*
10735 build_id_declarator (tree ident
)
10737 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
10738 ret
->kind
= cdk_id
;
10739 ret
->declarator
= 0;
10740 ret
->u
.id
.id
= ident
;
10741 ret
->u
.id
.attrs
= NULL_TREE
;
10742 /* Default value - may get reset to a more precise location. */
10743 ret
->id_loc
= input_location
;
10747 /* Return something to represent absolute declarators containing a *.
10748 TARGET is the absolute declarator that the * contains.
10749 TYPE_QUALS_ATTRS is a structure for type qualifiers and attributes
10750 to apply to the pointer type. */
10752 struct c_declarator
*
10753 make_pointer_declarator (struct c_declspecs
*type_quals_attrs
,
10754 struct c_declarator
*target
)
10758 struct c_declarator
*itarget
= target
;
10759 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
10760 if (type_quals_attrs
)
10762 attrs
= type_quals_attrs
->attrs
;
10763 quals
= quals_from_declspecs (type_quals_attrs
);
10764 if (attrs
!= NULL_TREE
)
10765 itarget
= build_attrs_declarator (attrs
, target
);
10767 ret
->kind
= cdk_pointer
;
10768 ret
->declarator
= itarget
;
10769 ret
->u
.pointer_quals
= quals
;
10773 /* Return a pointer to a structure for an empty list of declaration
10776 struct c_declspecs
*
10777 build_null_declspecs (void)
10779 struct c_declspecs
*ret
= XOBNEW (&parser_obstack
, struct c_declspecs
);
10780 memset (ret
, 0, sizeof *ret
);
10781 ret
->align_log
= -1;
10782 ret
->typespec_word
= cts_none
;
10783 ret
->storage_class
= csc_none
;
10784 ret
->expr_const_operands
= true;
10785 ret
->typespec_kind
= ctsk_none
;
10786 ret
->address_space
= ADDR_SPACE_GENERIC
;
10790 /* Add the address space ADDRSPACE to the declaration specifiers
10791 SPECS, returning SPECS. */
10793 struct c_declspecs
*
10794 declspecs_add_addrspace (location_t location
,
10795 struct c_declspecs
*specs
, addr_space_t as
)
10797 specs
->non_sc_seen_p
= true;
10798 specs
->declspecs_seen_p
= true;
10799 specs
->non_std_attrs_seen_p
= true;
10801 if (!ADDR_SPACE_GENERIC_P (specs
->address_space
)
10802 && specs
->address_space
!= as
)
10803 error ("incompatible address space qualifiers %qs and %qs",
10804 c_addr_space_name (as
),
10805 c_addr_space_name (specs
->address_space
));
10808 specs
->address_space
= as
;
10809 specs
->locations
[cdw_address_space
] = location
;
10814 /* Add the type qualifier QUAL to the declaration specifiers SPECS,
10815 returning SPECS. */
10817 struct c_declspecs
*
10818 declspecs_add_qual (location_t loc
,
10819 struct c_declspecs
*specs
, tree qual
)
10823 specs
->non_sc_seen_p
= true;
10824 specs
->declspecs_seen_p
= true;
10825 specs
->non_std_attrs_seen_p
= true;
10826 gcc_assert (TREE_CODE (qual
) == IDENTIFIER_NODE
10827 && C_IS_RESERVED_WORD (qual
));
10828 i
= C_RID_CODE (qual
);
10829 location_t prev_loc
= UNKNOWN_LOCATION
;
10833 dupe
= specs
->const_p
;
10834 specs
->const_p
= true;
10835 prev_loc
= specs
->locations
[cdw_const
];
10836 specs
->locations
[cdw_const
] = loc
;
10839 dupe
= specs
->volatile_p
;
10840 specs
->volatile_p
= true;
10841 prev_loc
= specs
->locations
[cdw_volatile
];
10842 specs
->locations
[cdw_volatile
] = loc
;
10845 dupe
= specs
->restrict_p
;
10846 specs
->restrict_p
= true;
10847 prev_loc
= specs
->locations
[cdw_restrict
];
10848 specs
->locations
[cdw_restrict
] = loc
;
10851 dupe
= specs
->atomic_p
;
10852 specs
->atomic_p
= true;
10853 prev_loc
= specs
->locations
[cdw_atomic
];
10854 specs
->locations
[cdw_atomic
] = loc
;
10857 gcc_unreachable ();
10861 bool warned
= pedwarn_c90 (loc
, OPT_Wpedantic
,
10862 "duplicate %qE declaration specifier", qual
);
10864 && warn_duplicate_decl_specifier
10865 && prev_loc
>= RESERVED_LOCATION_COUNT
10866 && !from_macro_expansion_at (prev_loc
)
10867 && !from_macro_expansion_at (loc
))
10868 warning_at (loc
, OPT_Wduplicate_decl_specifier
,
10869 "duplicate %qE declaration specifier", qual
);
10874 /* Add the type specifier TYPE to the declaration specifiers SPECS,
10875 returning SPECS. */
10877 struct c_declspecs
*
10878 declspecs_add_type (location_t loc
, struct c_declspecs
*specs
,
10879 struct c_typespec spec
)
10881 tree type
= spec
.spec
;
10882 specs
->non_sc_seen_p
= true;
10883 specs
->declspecs_seen_p
= true;
10884 specs
->non_std_attrs_seen_p
= true;
10885 specs
->typespec_kind
= spec
.kind
;
10886 if (TREE_DEPRECATED (type
))
10887 specs
->deprecated_p
= true;
10888 if (TREE_UNAVAILABLE (type
))
10889 specs
->unavailable_p
= true;
10891 /* Handle type specifier keywords. */
10892 if (TREE_CODE (type
) == IDENTIFIER_NODE
10893 && C_IS_RESERVED_WORD (type
)
10894 && C_RID_CODE (type
) != RID_CXX_COMPAT_WARN
)
10896 enum rid i
= C_RID_CODE (type
);
10899 error_at (loc
, "two or more data types in declaration specifiers");
10902 if ((int) i
<= (int) RID_LAST_MODIFIER
)
10904 /* "long", "short", "signed", "unsigned", "_Complex" or "_Sat". */
10909 if (specs
->long_long_p
)
10911 error_at (loc
, "%<long long long%> is too long for GCC");
10916 if (specs
->typespec_word
== cts_double
)
10919 ("both %<long long%> and %<double%> in "
10920 "declaration specifiers"));
10923 pedwarn_c90 (loc
, OPT_Wlong_long
,
10924 "ISO C90 does not support %<long long%>");
10925 specs
->long_long_p
= 1;
10926 specs
->locations
[cdw_long_long
] = loc
;
10929 if (specs
->short_p
)
10931 ("both %<long%> and %<short%> in "
10932 "declaration specifiers"));
10933 else if (specs
->typespec_word
== cts_auto_type
)
10935 ("both %<long%> and %<__auto_type%> in "
10936 "declaration specifiers"));
10937 else if (specs
->typespec_word
== cts_void
)
10939 ("both %<long%> and %<void%> in "
10940 "declaration specifiers"));
10941 else if (specs
->typespec_word
== cts_int_n
)
10943 ("both %<long%> and %<__int%d%> in "
10944 "declaration specifiers"),
10945 int_n_data
[specs
->int_n_idx
].bitsize
);
10946 else if (specs
->typespec_word
== cts_bool
)
10948 ("both %<long%> and %<_Bool%> in "
10949 "declaration specifiers"));
10950 else if (specs
->typespec_word
== cts_char
)
10952 ("both %<long%> and %<char%> in "
10953 "declaration specifiers"));
10954 else if (specs
->typespec_word
== cts_float
)
10956 ("both %<long%> and %<float%> in "
10957 "declaration specifiers"));
10958 else if (specs
->typespec_word
== cts_floatn_nx
)
10960 ("both %<long%> and %<_Float%d%s%> in "
10961 "declaration specifiers"),
10962 floatn_nx_types
[specs
->floatn_nx_idx
].n
,
10963 (floatn_nx_types
[specs
->floatn_nx_idx
].extended
10966 else if (specs
->typespec_word
== cts_dfloat32
)
10968 ("both %<long%> and %<_Decimal32%> in "
10969 "declaration specifiers"));
10970 else if (specs
->typespec_word
== cts_dfloat64
)
10972 ("both %<long%> and %<_Decimal64%> in "
10973 "declaration specifiers"));
10974 else if (specs
->typespec_word
== cts_dfloat128
)
10976 ("both %<long%> and %<_Decimal128%> in "
10977 "declaration specifiers"));
10980 specs
->long_p
= true;
10981 specs
->locations
[cdw_long
] = loc
;
10985 dupe
= specs
->short_p
;
10988 ("both %<long%> and %<short%> in "
10989 "declaration specifiers"));
10990 else if (specs
->typespec_word
== cts_auto_type
)
10992 ("both %<short%> and %<__auto_type%> in "
10993 "declaration specifiers"));
10994 else if (specs
->typespec_word
== cts_void
)
10996 ("both %<short%> and %<void%> in "
10997 "declaration specifiers"));
10998 else if (specs
->typespec_word
== cts_int_n
)
11000 ("both %<short%> and %<__int%d%> in "
11001 "declaration specifiers"),
11002 int_n_data
[specs
->int_n_idx
].bitsize
);
11003 else if (specs
->typespec_word
== cts_bool
)
11005 ("both %<short%> and %<_Bool%> in "
11006 "declaration specifiers"));
11007 else if (specs
->typespec_word
== cts_char
)
11009 ("both %<short%> and %<char%> in "
11010 "declaration specifiers"));
11011 else if (specs
->typespec_word
== cts_float
)
11013 ("both %<short%> and %<float%> in "
11014 "declaration specifiers"));
11015 else if (specs
->typespec_word
== cts_double
)
11017 ("both %<short%> and %<double%> in "
11018 "declaration specifiers"));
11019 else if (specs
->typespec_word
== cts_floatn_nx
)
11021 ("both %<short%> and %<_Float%d%s%> in "
11022 "declaration specifiers"),
11023 floatn_nx_types
[specs
->floatn_nx_idx
].n
,
11024 (floatn_nx_types
[specs
->floatn_nx_idx
].extended
11027 else if (specs
->typespec_word
== cts_dfloat32
)
11029 ("both %<short%> and %<_Decimal32%> in "
11030 "declaration specifiers"));
11031 else if (specs
->typespec_word
== cts_dfloat64
)
11033 ("both %<short%> and %<_Decimal64%> in "
11034 "declaration specifiers"));
11035 else if (specs
->typespec_word
== cts_dfloat128
)
11037 ("both %<short%> and %<_Decimal128%> in "
11038 "declaration specifiers"));
11041 specs
->short_p
= true;
11042 specs
->locations
[cdw_short
] = loc
;
11046 dupe
= specs
->signed_p
;
11047 if (specs
->unsigned_p
)
11049 ("both %<signed%> and %<unsigned%> in "
11050 "declaration specifiers"));
11051 else if (specs
->typespec_word
== cts_auto_type
)
11053 ("both %<signed%> and %<__auto_type%> in "
11054 "declaration specifiers"));
11055 else if (specs
->typespec_word
== cts_void
)
11057 ("both %<signed%> and %<void%> in "
11058 "declaration specifiers"));
11059 else if (specs
->typespec_word
== cts_bool
)
11061 ("both %<signed%> and %<_Bool%> in "
11062 "declaration specifiers"));
11063 else if (specs
->typespec_word
== cts_float
)
11065 ("both %<signed%> and %<float%> in "
11066 "declaration specifiers"));
11067 else if (specs
->typespec_word
== cts_double
)
11069 ("both %<signed%> and %<double%> in "
11070 "declaration specifiers"));
11071 else if (specs
->typespec_word
== cts_floatn_nx
)
11073 ("both %<signed%> and %<_Float%d%s%> in "
11074 "declaration specifiers"),
11075 floatn_nx_types
[specs
->floatn_nx_idx
].n
,
11076 (floatn_nx_types
[specs
->floatn_nx_idx
].extended
11079 else if (specs
->typespec_word
== cts_dfloat32
)
11081 ("both %<signed%> and %<_Decimal32%> in "
11082 "declaration specifiers"));
11083 else if (specs
->typespec_word
== cts_dfloat64
)
11085 ("both %<signed%> and %<_Decimal64%> in "
11086 "declaration specifiers"));
11087 else if (specs
->typespec_word
== cts_dfloat128
)
11089 ("both %<signed%> and %<_Decimal128%> in "
11090 "declaration specifiers"));
11093 specs
->signed_p
= true;
11094 specs
->locations
[cdw_signed
] = loc
;
11098 dupe
= specs
->unsigned_p
;
11099 if (specs
->signed_p
)
11101 ("both %<signed%> and %<unsigned%> in "
11102 "declaration specifiers"));
11103 else if (specs
->typespec_word
== cts_auto_type
)
11105 ("both %<unsigned%> and %<__auto_type%> in "
11106 "declaration specifiers"));
11107 else if (specs
->typespec_word
== cts_void
)
11109 ("both %<unsigned%> and %<void%> in "
11110 "declaration specifiers"));
11111 else if (specs
->typespec_word
== cts_bool
)
11113 ("both %<unsigned%> and %<_Bool%> in "
11114 "declaration specifiers"));
11115 else if (specs
->typespec_word
== cts_float
)
11117 ("both %<unsigned%> and %<float%> in "
11118 "declaration specifiers"));
11119 else if (specs
->typespec_word
== cts_double
)
11121 ("both %<unsigned%> and %<double%> in "
11122 "declaration specifiers"));
11123 else if (specs
->typespec_word
== cts_floatn_nx
)
11125 ("both %<unsigned%> and %<_Float%d%s%> in "
11126 "declaration specifiers"),
11127 floatn_nx_types
[specs
->floatn_nx_idx
].n
,
11128 (floatn_nx_types
[specs
->floatn_nx_idx
].extended
11131 else if (specs
->typespec_word
== cts_dfloat32
)
11133 ("both %<unsigned%> and %<_Decimal32%> in "
11134 "declaration specifiers"));
11135 else if (specs
->typespec_word
== cts_dfloat64
)
11137 ("both %<unsigned%> and %<_Decimal64%> in "
11138 "declaration specifiers"));
11139 else if (specs
->typespec_word
== cts_dfloat128
)
11141 ("both %<unsigned%> and %<_Decimal128%> in "
11142 "declaration specifiers"));
11145 specs
->unsigned_p
= true;
11146 specs
->locations
[cdw_unsigned
] = loc
;
11150 dupe
= specs
->complex_p
;
11151 if (!in_system_header_at (loc
))
11152 pedwarn_c90 (loc
, OPT_Wpedantic
,
11153 "ISO C90 does not support complex types");
11154 if (specs
->typespec_word
== cts_auto_type
)
11156 ("both %<complex%> and %<__auto_type%> in "
11157 "declaration specifiers"));
11158 else if (specs
->typespec_word
== cts_void
)
11160 ("both %<complex%> and %<void%> in "
11161 "declaration specifiers"));
11162 else if (specs
->typespec_word
== cts_bool
)
11164 ("both %<complex%> and %<_Bool%> in "
11165 "declaration specifiers"));
11166 else if (specs
->typespec_word
== cts_dfloat32
)
11168 ("both %<complex%> and %<_Decimal32%> in "
11169 "declaration specifiers"));
11170 else if (specs
->typespec_word
== cts_dfloat64
)
11172 ("both %<complex%> and %<_Decimal64%> in "
11173 "declaration specifiers"));
11174 else if (specs
->typespec_word
== cts_dfloat128
)
11176 ("both %<complex%> and %<_Decimal128%> in "
11177 "declaration specifiers"));
11178 else if (specs
->typespec_word
== cts_fract
)
11180 ("both %<complex%> and %<_Fract%> in "
11181 "declaration specifiers"));
11182 else if (specs
->typespec_word
== cts_accum
)
11184 ("both %<complex%> and %<_Accum%> in "
11185 "declaration specifiers"));
11186 else if (specs
->saturating_p
)
11188 ("both %<complex%> and %<_Sat%> in "
11189 "declaration specifiers"));
11192 specs
->complex_p
= true;
11193 specs
->locations
[cdw_complex
] = loc
;
11197 dupe
= specs
->saturating_p
;
11198 pedwarn (loc
, OPT_Wpedantic
,
11199 "ISO C does not support saturating types");
11200 if (specs
->typespec_word
== cts_int_n
)
11203 ("both %<_Sat%> and %<__int%d%> in "
11204 "declaration specifiers"),
11205 int_n_data
[specs
->int_n_idx
].bitsize
);
11207 else if (specs
->typespec_word
== cts_auto_type
)
11209 ("both %<_Sat%> and %<__auto_type%> in "
11210 "declaration specifiers"));
11211 else if (specs
->typespec_word
== cts_void
)
11213 ("both %<_Sat%> and %<void%> in "
11214 "declaration specifiers"));
11215 else if (specs
->typespec_word
== cts_bool
)
11217 ("both %<_Sat%> and %<_Bool%> in "
11218 "declaration specifiers"));
11219 else if (specs
->typespec_word
== cts_char
)
11221 ("both %<_Sat%> and %<char%> in "
11222 "declaration specifiers"));
11223 else if (specs
->typespec_word
== cts_int
)
11225 ("both %<_Sat%> and %<int%> in "
11226 "declaration specifiers"));
11227 else if (specs
->typespec_word
== cts_float
)
11229 ("both %<_Sat%> and %<float%> in "
11230 "declaration specifiers"));
11231 else if (specs
->typespec_word
== cts_double
)
11233 ("both %<_Sat%> and %<double%> in "
11234 "declaration specifiers"));
11235 else if (specs
->typespec_word
== cts_floatn_nx
)
11237 ("both %<_Sat%> and %<_Float%d%s%> in "
11238 "declaration specifiers"),
11239 floatn_nx_types
[specs
->floatn_nx_idx
].n
,
11240 (floatn_nx_types
[specs
->floatn_nx_idx
].extended
11243 else if (specs
->typespec_word
== cts_dfloat32
)
11245 ("both %<_Sat%> and %<_Decimal32%> in "
11246 "declaration specifiers"));
11247 else if (specs
->typespec_word
== cts_dfloat64
)
11249 ("both %<_Sat%> and %<_Decimal64%> in "
11250 "declaration specifiers"));
11251 else if (specs
->typespec_word
== cts_dfloat128
)
11253 ("both %<_Sat%> and %<_Decimal128%> in "
11254 "declaration specifiers"));
11255 else if (specs
->complex_p
)
11257 ("both %<_Sat%> and %<complex%> in "
11258 "declaration specifiers"));
11261 specs
->saturating_p
= true;
11262 specs
->locations
[cdw_saturating
] = loc
;
11266 gcc_unreachable ();
11270 error_at (loc
, "duplicate %qE", type
);
11276 /* "void", "_Bool", "char", "int", "float", "double",
11277 "_FloatN", "_FloatNx", "_Decimal32", "__intN",
11278 "_Decimal64", "_Decimal128", "_Fract", "_Accum" or
11280 if (specs
->typespec_word
!= cts_none
)
11283 "two or more data types in declaration specifiers");
11288 case RID_AUTO_TYPE
:
11291 ("both %<long%> and %<__auto_type%> in "
11292 "declaration specifiers"));
11293 else if (specs
->short_p
)
11295 ("both %<short%> and %<__auto_type%> in "
11296 "declaration specifiers"));
11297 else if (specs
->signed_p
)
11299 ("both %<signed%> and %<__auto_type%> in "
11300 "declaration specifiers"));
11301 else if (specs
->unsigned_p
)
11303 ("both %<unsigned%> and %<__auto_type%> in "
11304 "declaration specifiers"));
11305 else if (specs
->complex_p
)
11307 ("both %<complex%> and %<__auto_type%> in "
11308 "declaration specifiers"));
11309 else if (specs
->saturating_p
)
11311 ("both %<_Sat%> and %<__auto_type%> in "
11312 "declaration specifiers"));
11315 specs
->typespec_word
= cts_auto_type
;
11316 specs
->locations
[cdw_typespec
] = loc
;
11323 specs
->int_n_idx
= i
- RID_INT_N_0
;
11324 if (!in_system_header_at (input_location
)
11325 /* If the INT_N type ends in "__", and so is of the format
11326 "__intN__", don't pedwarn. */
11327 && (strncmp (IDENTIFIER_POINTER (type
)
11328 + (IDENTIFIER_LENGTH (type
) - 2), "__", 2) != 0))
11329 pedwarn (loc
, OPT_Wpedantic
,
11330 "ISO C does not support %<__int%d%> types",
11331 int_n_data
[specs
->int_n_idx
].bitsize
);
11335 ("both %<__int%d%> and %<long%> in "
11336 "declaration specifiers"),
11337 int_n_data
[specs
->int_n_idx
].bitsize
);
11338 else if (specs
->saturating_p
)
11340 ("both %<_Sat%> and %<__int%d%> in "
11341 "declaration specifiers"),
11342 int_n_data
[specs
->int_n_idx
].bitsize
);
11343 else if (specs
->short_p
)
11345 ("both %<__int%d%> and %<short%> in "
11346 "declaration specifiers"),
11347 int_n_data
[specs
->int_n_idx
].bitsize
);
11348 else if (! int_n_enabled_p
[specs
->int_n_idx
])
11350 specs
->typespec_word
= cts_int_n
;
11352 "%<__int%d%> is not supported on this target",
11353 int_n_data
[specs
->int_n_idx
].bitsize
);
11357 specs
->typespec_word
= cts_int_n
;
11358 specs
->locations
[cdw_typespec
] = loc
;
11364 ("both %<long%> and %<void%> in "
11365 "declaration specifiers"));
11366 else if (specs
->short_p
)
11368 ("both %<short%> and %<void%> in "
11369 "declaration specifiers"));
11370 else if (specs
->signed_p
)
11372 ("both %<signed%> and %<void%> in "
11373 "declaration specifiers"));
11374 else if (specs
->unsigned_p
)
11376 ("both %<unsigned%> and %<void%> in "
11377 "declaration specifiers"));
11378 else if (specs
->complex_p
)
11380 ("both %<complex%> and %<void%> in "
11381 "declaration specifiers"));
11382 else if (specs
->saturating_p
)
11384 ("both %<_Sat%> and %<void%> in "
11385 "declaration specifiers"));
11388 specs
->typespec_word
= cts_void
;
11389 specs
->locations
[cdw_typespec
] = loc
;
11393 if (!in_system_header_at (loc
))
11394 pedwarn_c90 (loc
, OPT_Wpedantic
,
11395 "ISO C90 does not support boolean types");
11398 ("both %<long%> and %<_Bool%> in "
11399 "declaration specifiers"));
11400 else if (specs
->short_p
)
11402 ("both %<short%> and %<_Bool%> in "
11403 "declaration specifiers"));
11404 else if (specs
->signed_p
)
11406 ("both %<signed%> and %<_Bool%> in "
11407 "declaration specifiers"));
11408 else if (specs
->unsigned_p
)
11410 ("both %<unsigned%> and %<_Bool%> in "
11411 "declaration specifiers"));
11412 else if (specs
->complex_p
)
11414 ("both %<complex%> and %<_Bool%> in "
11415 "declaration specifiers"));
11416 else if (specs
->saturating_p
)
11418 ("both %<_Sat%> and %<_Bool%> in "
11419 "declaration specifiers"));
11422 specs
->typespec_word
= cts_bool
;
11423 specs
->locations
[cdw_typespec
] = loc
;
11429 ("both %<long%> and %<char%> in "
11430 "declaration specifiers"));
11431 else if (specs
->short_p
)
11433 ("both %<short%> and %<char%> in "
11434 "declaration specifiers"));
11435 else if (specs
->saturating_p
)
11437 ("both %<_Sat%> and %<char%> in "
11438 "declaration specifiers"));
11441 specs
->typespec_word
= cts_char
;
11442 specs
->locations
[cdw_typespec
] = loc
;
11446 if (specs
->saturating_p
)
11448 ("both %<_Sat%> and %<int%> in "
11449 "declaration specifiers"));
11452 specs
->typespec_word
= cts_int
;
11453 specs
->locations
[cdw_typespec
] = loc
;
11459 ("both %<long%> and %<float%> in "
11460 "declaration specifiers"));
11461 else if (specs
->short_p
)
11463 ("both %<short%> and %<float%> in "
11464 "declaration specifiers"));
11465 else if (specs
->signed_p
)
11467 ("both %<signed%> and %<float%> in "
11468 "declaration specifiers"));
11469 else if (specs
->unsigned_p
)
11471 ("both %<unsigned%> and %<float%> in "
11472 "declaration specifiers"));
11473 else if (specs
->saturating_p
)
11475 ("both %<_Sat%> and %<float%> in "
11476 "declaration specifiers"));
11479 specs
->typespec_word
= cts_float
;
11480 specs
->locations
[cdw_typespec
] = loc
;
11484 if (specs
->long_long_p
)
11486 ("both %<long long%> and %<double%> in "
11487 "declaration specifiers"));
11488 else if (specs
->short_p
)
11490 ("both %<short%> and %<double%> in "
11491 "declaration specifiers"));
11492 else if (specs
->signed_p
)
11494 ("both %<signed%> and %<double%> in "
11495 "declaration specifiers"));
11496 else if (specs
->unsigned_p
)
11498 ("both %<unsigned%> and %<double%> in "
11499 "declaration specifiers"));
11500 else if (specs
->saturating_p
)
11502 ("both %<_Sat%> and %<double%> in "
11503 "declaration specifiers"));
11506 specs
->typespec_word
= cts_double
;
11507 specs
->locations
[cdw_typespec
] = loc
;
11510 CASE_RID_FLOATN_NX
:
11511 specs
->floatn_nx_idx
= i
- RID_FLOATN_NX_FIRST
;
11512 if (!in_system_header_at (input_location
))
11513 pedwarn (loc
, OPT_Wpedantic
,
11514 "ISO C does not support the %<_Float%d%s%> type",
11515 floatn_nx_types
[specs
->floatn_nx_idx
].n
,
11516 (floatn_nx_types
[specs
->floatn_nx_idx
].extended
11522 ("both %<long%> and %<_Float%d%s%> in "
11523 "declaration specifiers"),
11524 floatn_nx_types
[specs
->floatn_nx_idx
].n
,
11525 (floatn_nx_types
[specs
->floatn_nx_idx
].extended
11528 else if (specs
->short_p
)
11530 ("both %<short%> and %<_Float%d%s%> in "
11531 "declaration specifiers"),
11532 floatn_nx_types
[specs
->floatn_nx_idx
].n
,
11533 (floatn_nx_types
[specs
->floatn_nx_idx
].extended
11536 else if (specs
->signed_p
)
11538 ("both %<signed%> and %<_Float%d%s%> in "
11539 "declaration specifiers"),
11540 floatn_nx_types
[specs
->floatn_nx_idx
].n
,
11541 (floatn_nx_types
[specs
->floatn_nx_idx
].extended
11544 else if (specs
->unsigned_p
)
11546 ("both %<unsigned%> and %<_Float%d%s%> in "
11547 "declaration specifiers"),
11548 floatn_nx_types
[specs
->floatn_nx_idx
].n
,
11549 (floatn_nx_types
[specs
->floatn_nx_idx
].extended
11552 else if (specs
->saturating_p
)
11554 ("both %<_Sat%> and %<_Float%d%s%> in "
11555 "declaration specifiers"),
11556 floatn_nx_types
[specs
->floatn_nx_idx
].n
,
11557 (floatn_nx_types
[specs
->floatn_nx_idx
].extended
11560 else if (FLOATN_NX_TYPE_NODE (specs
->floatn_nx_idx
) == NULL_TREE
)
11562 specs
->typespec_word
= cts_floatn_nx
;
11564 "%<_Float%d%s%> is not supported on this target",
11565 floatn_nx_types
[specs
->floatn_nx_idx
].n
,
11566 (floatn_nx_types
[specs
->floatn_nx_idx
].extended
11572 specs
->typespec_word
= cts_floatn_nx
;
11573 specs
->locations
[cdw_typespec
] = loc
;
11578 case RID_DFLOAT128
:
11581 if (i
== RID_DFLOAT32
)
11582 str
= "_Decimal32";
11583 else if (i
== RID_DFLOAT64
)
11584 str
= "_Decimal64";
11586 str
= "_Decimal128";
11587 if (specs
->long_long_p
)
11589 ("both %<long long%> and %qs in "
11590 "declaration specifiers"),
11594 ("both %<long%> and %qs in "
11595 "declaration specifiers"),
11597 else if (specs
->short_p
)
11599 ("both %<short%> and %qs in "
11600 "declaration specifiers"),
11602 else if (specs
->signed_p
)
11604 ("both %<signed%> and %qs in "
11605 "declaration specifiers"),
11607 else if (specs
->unsigned_p
)
11609 ("both %<unsigned%> and %qs in "
11610 "declaration specifiers"),
11612 else if (specs
->complex_p
)
11614 ("both %<complex%> and %qs in "
11615 "declaration specifiers"),
11617 else if (specs
->saturating_p
)
11619 ("both %<_Sat%> and %qs in "
11620 "declaration specifiers"),
11622 else if (i
== RID_DFLOAT32
)
11623 specs
->typespec_word
= cts_dfloat32
;
11624 else if (i
== RID_DFLOAT64
)
11625 specs
->typespec_word
= cts_dfloat64
;
11627 specs
->typespec_word
= cts_dfloat128
;
11628 specs
->locations
[cdw_typespec
] = loc
;
11630 if (!targetm
.decimal_float_supported_p ())
11632 ("decimal floating-point not supported "
11633 "for this target"));
11634 pedwarn_c11 (loc
, OPT_Wpedantic
,
11635 "ISO C does not support decimal floating-point "
11642 if (i
== RID_FRACT
)
11646 if (specs
->complex_p
)
11648 ("both %<complex%> and %qs in "
11649 "declaration specifiers"),
11651 else if (i
== RID_FRACT
)
11652 specs
->typespec_word
= cts_fract
;
11654 specs
->typespec_word
= cts_accum
;
11655 specs
->locations
[cdw_typespec
] = loc
;
11657 if (!targetm
.fixed_point_supported_p ())
11659 "fixed-point types not supported for this target");
11660 pedwarn (loc
, OPT_Wpedantic
,
11661 "ISO C does not support fixed-point types");
11664 /* ObjC reserved word "id", handled below. */
11670 /* Now we have a typedef (a TYPE_DECL node), an identifier (some
11671 form of ObjC type, cases such as "int" and "long" being handled
11672 above), a TYPE (struct, union, enum and typeof specifiers) or an
11673 ERROR_MARK. In none of these cases may there have previously
11674 been any type specifiers. */
11675 if (specs
->type
|| specs
->typespec_word
!= cts_none
11676 || specs
->long_p
|| specs
->short_p
|| specs
->signed_p
11677 || specs
->unsigned_p
|| specs
->complex_p
)
11678 error_at (loc
, "two or more data types in declaration specifiers");
11679 else if (TREE_CODE (type
) == TYPE_DECL
)
11681 if (TREE_TYPE (type
) == error_mark_node
)
11682 ; /* Allow the type to default to int to avoid cascading errors. */
11685 specs
->type
= TREE_TYPE (type
);
11686 specs
->decl_attr
= DECL_ATTRIBUTES (type
);
11687 specs
->typedef_p
= true;
11688 specs
->explicit_signed_p
= C_TYPEDEF_EXPLICITLY_SIGNED (type
);
11689 specs
->locations
[cdw_typedef
] = loc
;
11691 /* If this typedef name is defined in a struct, then a C++
11692 lookup would return a different value. */
11693 if (warn_cxx_compat
11694 && I_SYMBOL_BINDING (DECL_NAME (type
))->in_struct
)
11695 warning_at (loc
, OPT_Wc___compat
,
11696 "C++ lookup of %qD would return a field, not a type",
11699 /* If we are parsing a struct, record that a struct field
11701 if (warn_cxx_compat
&& struct_parse_info
!= NULL
)
11702 struct_parse_info
->typedefs_seen
.safe_push (type
);
11705 else if (TREE_CODE (type
) == IDENTIFIER_NODE
)
11707 tree t
= lookup_name (type
);
11708 if (!t
|| TREE_CODE (t
) != TYPE_DECL
)
11709 error_at (loc
, "%qE fails to be a typedef or built in type", type
);
11710 else if (TREE_TYPE (t
) == error_mark_node
)
11714 specs
->type
= TREE_TYPE (t
);
11715 specs
->locations
[cdw_typespec
] = loc
;
11720 if (TREE_CODE (type
) != ERROR_MARK
&& spec
.kind
== ctsk_typeof
)
11722 specs
->typedef_p
= true;
11723 specs
->locations
[cdw_typedef
] = loc
;
11727 specs
->expr
= build2 (COMPOUND_EXPR
, TREE_TYPE (spec
.expr
),
11728 specs
->expr
, spec
.expr
);
11730 specs
->expr
= spec
.expr
;
11731 specs
->expr_const_operands
&= spec
.expr_const_operands
;
11734 specs
->type
= type
;
11740 /* Add the storage class specifier or function specifier SCSPEC to the
11741 declaration specifiers SPECS, returning SPECS. */
11743 struct c_declspecs
*
11744 declspecs_add_scspec (location_t loc
,
11745 struct c_declspecs
*specs
,
11749 enum c_storage_class n
= csc_none
;
11751 specs
->declspecs_seen_p
= true;
11752 specs
->non_std_attrs_seen_p
= true;
11753 gcc_assert (TREE_CODE (scspec
) == IDENTIFIER_NODE
11754 && C_IS_RESERVED_WORD (scspec
));
11755 i
= C_RID_CODE (scspec
);
11756 if (specs
->non_sc_seen_p
)
11757 warning (OPT_Wold_style_declaration
,
11758 "%qE is not at beginning of declaration", scspec
);
11762 /* C99 permits duplicate inline. Although of doubtful utility,
11763 it seems simplest to permit it in gnu89 mode as well, as
11764 there is also little utility in maintaining this as a
11765 difference between gnu89 and C99 inline. */
11767 specs
->inline_p
= true;
11768 specs
->locations
[cdw_inline
] = loc
;
11771 /* Duplicate _Noreturn is permitted. */
11773 specs
->noreturn_p
= true;
11774 specs
->locations
[cdw_noreturn
] = loc
;
11777 dupe
= specs
->thread_p
;
11778 if (specs
->storage_class
== csc_auto
)
11779 error ("%qE used with %<auto%>", scspec
);
11780 else if (specs
->storage_class
== csc_register
)
11781 error ("%qE used with %<register%>", scspec
);
11782 else if (specs
->storage_class
== csc_typedef
)
11783 error ("%qE used with %<typedef%>", scspec
);
11786 specs
->thread_p
= true;
11787 specs
->thread_gnu_p
= (strcmp (IDENTIFIER_POINTER (scspec
),
11789 /* A diagnostic is not required for the use of this
11790 identifier in the implementation namespace; only diagnose
11791 it for the C11 spelling because of existing code using
11792 the other spelling. */
11793 if (!specs
->thread_gnu_p
)
11796 pedwarn_c99 (loc
, OPT_Wpedantic
,
11797 "ISO C99 does not support %qE", scspec
);
11799 pedwarn_c99 (loc
, OPT_Wpedantic
,
11800 "ISO C90 does not support %qE", scspec
);
11802 specs
->locations
[cdw_thread
] = loc
;
11810 /* Diagnose "__thread extern". */
11811 if (specs
->thread_p
&& specs
->thread_gnu_p
)
11812 error ("%<__thread%> before %<extern%>");
11819 /* Diagnose "__thread static". */
11820 if (specs
->thread_p
&& specs
->thread_gnu_p
)
11821 error ("%<__thread%> before %<static%>");
11827 gcc_unreachable ();
11829 if (n
!= csc_none
&& n
== specs
->storage_class
)
11833 if (i
== RID_THREAD
)
11834 error ("duplicate %<_Thread_local%> or %<__thread%>");
11836 error ("duplicate %qE", scspec
);
11840 if (specs
->storage_class
!= csc_none
&& n
!= specs
->storage_class
)
11842 error ("multiple storage classes in declaration specifiers");
11846 specs
->storage_class
= n
;
11847 specs
->locations
[cdw_storage_class
] = loc
;
11848 if (n
!= csc_extern
&& n
!= csc_static
&& specs
->thread_p
)
11850 error ("%qs used with %qE",
11851 specs
->thread_gnu_p
? "__thread" : "_Thread_local",
11853 specs
->thread_p
= false;
11860 /* Add the attributes ATTRS to the declaration specifiers SPECS,
11861 returning SPECS. */
11863 struct c_declspecs
*
11864 declspecs_add_attrs (location_t loc
, struct c_declspecs
*specs
, tree attrs
)
11866 specs
->attrs
= chainon (attrs
, specs
->attrs
);
11867 specs
->locations
[cdw_attributes
] = loc
;
11868 specs
->declspecs_seen_p
= true;
11869 /* In the case of standard attributes at the start of the
11870 declaration, the caller will reset this. */
11871 specs
->non_std_attrs_seen_p
= true;
11875 /* Add an _Alignas specifier (expression ALIGN, or type whose
11876 alignment is ALIGN) to the declaration specifiers SPECS, returning
11878 struct c_declspecs
*
11879 declspecs_add_alignas (location_t loc
,
11880 struct c_declspecs
*specs
, tree align
)
11882 specs
->alignas_p
= true;
11883 specs
->locations
[cdw_alignas
] = loc
;
11884 if (align
== error_mark_node
)
11887 /* Only accept the alignment if it's valid and greater than
11888 the current one. Zero is invalid but by C11 required to
11889 be silently ignored. */
11890 int align_log
= check_user_alignment (align
, false, /* warn_zero = */false);
11891 if (align_log
> specs
->align_log
)
11892 specs
->align_log
= align_log
;
11896 /* Combine "long", "short", "signed", "unsigned" and "_Complex" type
11897 specifiers with any other type specifier to determine the resulting
11898 type. This is where ISO C checks on complex types are made, since
11899 "_Complex long" is a prefix of the valid ISO C type "_Complex long
11900 double". Also apply postfix standard attributes to modify the type. */
11902 struct c_declspecs
*
11903 finish_declspecs (struct c_declspecs
*specs
)
11905 /* If a type was specified as a whole, we have no modifiers and are
11907 if (specs
->type
!= NULL_TREE
)
11909 gcc_assert (!specs
->long_p
&& !specs
->long_long_p
&& !specs
->short_p
11910 && !specs
->signed_p
&& !specs
->unsigned_p
11911 && !specs
->complex_p
);
11913 /* Set a dummy type. */
11914 if (TREE_CODE (specs
->type
) == ERROR_MARK
)
11915 specs
->type
= integer_type_node
;
11916 goto handle_postfix_attrs
;
11919 /* If none of "void", "_Bool", "char", "int", "float" or "double"
11920 has been specified, treat it as "int" unless "_Complex" is
11921 present and there are no other specifiers. If we just have
11922 "_Complex", it is equivalent to "_Complex double", but e.g.
11923 "_Complex short" is equivalent to "_Complex short int". */
11924 if (specs
->typespec_word
== cts_none
)
11926 if (specs
->saturating_p
)
11928 error_at (specs
->locations
[cdw_saturating
],
11929 "%<_Sat%> is used without %<_Fract%> or %<_Accum%>");
11930 if (!targetm
.fixed_point_supported_p ())
11931 error_at (specs
->locations
[cdw_saturating
],
11932 "fixed-point types not supported for this target");
11933 specs
->typespec_word
= cts_fract
;
11935 else if (specs
->long_p
|| specs
->short_p
11936 || specs
->signed_p
|| specs
->unsigned_p
)
11938 specs
->typespec_word
= cts_int
;
11940 else if (specs
->complex_p
)
11942 specs
->typespec_word
= cts_double
;
11943 pedwarn (specs
->locations
[cdw_complex
], OPT_Wpedantic
,
11944 "ISO C does not support plain %<complex%> meaning "
11945 "%<double complex%>");
11949 specs
->typespec_word
= cts_int
;
11950 specs
->default_int_p
= true;
11951 /* We don't diagnose this here because grokdeclarator will
11952 give more specific diagnostics according to whether it is
11953 a function definition. */
11957 /* If "signed" was specified, record this to distinguish "int" and
11958 "signed int" in the case of a bit-field with
11959 -funsigned-bitfields. */
11960 specs
->explicit_signed_p
= specs
->signed_p
;
11962 /* Now compute the actual type. */
11963 switch (specs
->typespec_word
)
11965 case cts_auto_type
:
11966 gcc_assert (!specs
->long_p
&& !specs
->short_p
11967 && !specs
->signed_p
&& !specs
->unsigned_p
11968 && !specs
->complex_p
);
11969 /* Type to be filled in later. */
11970 if (specs
->postfix_attrs
)
11971 error ("%<__auto_type%> followed by %<[[]]%> attributes");
11974 gcc_assert (!specs
->long_p
&& !specs
->short_p
11975 && !specs
->signed_p
&& !specs
->unsigned_p
11976 && !specs
->complex_p
);
11977 specs
->type
= void_type_node
;
11980 gcc_assert (!specs
->long_p
&& !specs
->short_p
11981 && !specs
->signed_p
&& !specs
->unsigned_p
11982 && !specs
->complex_p
);
11983 specs
->type
= boolean_type_node
;
11986 gcc_assert (!specs
->long_p
&& !specs
->short_p
);
11987 gcc_assert (!(specs
->signed_p
&& specs
->unsigned_p
));
11988 if (specs
->signed_p
)
11989 specs
->type
= signed_char_type_node
;
11990 else if (specs
->unsigned_p
)
11991 specs
->type
= unsigned_char_type_node
;
11993 specs
->type
= char_type_node
;
11994 if (specs
->complex_p
)
11996 pedwarn (specs
->locations
[cdw_complex
], OPT_Wpedantic
,
11997 "ISO C does not support complex integer types");
11998 specs
->type
= build_complex_type (specs
->type
);
12002 gcc_assert (!specs
->long_p
&& !specs
->short_p
&& !specs
->long_long_p
);
12003 gcc_assert (!(specs
->signed_p
&& specs
->unsigned_p
));
12004 if (! int_n_enabled_p
[specs
->int_n_idx
])
12005 specs
->type
= integer_type_node
;
12007 specs
->type
= (specs
->unsigned_p
12008 ? int_n_trees
[specs
->int_n_idx
].unsigned_type
12009 : int_n_trees
[specs
->int_n_idx
].signed_type
);
12010 if (specs
->complex_p
)
12012 pedwarn (specs
->locations
[cdw_complex
], OPT_Wpedantic
,
12013 "ISO C does not support complex integer types");
12014 specs
->type
= build_complex_type (specs
->type
);
12018 gcc_assert (!(specs
->long_p
&& specs
->short_p
));
12019 gcc_assert (!(specs
->signed_p
&& specs
->unsigned_p
));
12020 if (specs
->long_long_p
)
12021 specs
->type
= (specs
->unsigned_p
12022 ? long_long_unsigned_type_node
12023 : long_long_integer_type_node
);
12024 else if (specs
->long_p
)
12025 specs
->type
= (specs
->unsigned_p
12026 ? long_unsigned_type_node
12027 : long_integer_type_node
);
12028 else if (specs
->short_p
)
12029 specs
->type
= (specs
->unsigned_p
12030 ? short_unsigned_type_node
12031 : short_integer_type_node
);
12033 specs
->type
= (specs
->unsigned_p
12034 ? unsigned_type_node
12035 : integer_type_node
);
12036 if (specs
->complex_p
)
12038 pedwarn (specs
->locations
[cdw_complex
], OPT_Wpedantic
,
12039 "ISO C does not support complex integer types");
12040 specs
->type
= build_complex_type (specs
->type
);
12044 gcc_assert (!specs
->long_p
&& !specs
->short_p
12045 && !specs
->signed_p
&& !specs
->unsigned_p
);
12046 specs
->type
= (specs
->complex_p
12047 ? complex_float_type_node
12048 : float_type_node
);
12051 gcc_assert (!specs
->long_long_p
&& !specs
->short_p
12052 && !specs
->signed_p
&& !specs
->unsigned_p
);
12055 specs
->type
= (specs
->complex_p
12056 ? complex_long_double_type_node
12057 : long_double_type_node
);
12061 specs
->type
= (specs
->complex_p
12062 ? complex_double_type_node
12063 : double_type_node
);
12066 case cts_floatn_nx
:
12067 gcc_assert (!specs
->long_p
&& !specs
->short_p
12068 && !specs
->signed_p
&& !specs
->unsigned_p
);
12069 if (FLOATN_NX_TYPE_NODE (specs
->floatn_nx_idx
) == NULL_TREE
)
12070 specs
->type
= integer_type_node
;
12071 else if (specs
->complex_p
)
12072 specs
->type
= COMPLEX_FLOATN_NX_TYPE_NODE (specs
->floatn_nx_idx
);
12074 specs
->type
= FLOATN_NX_TYPE_NODE (specs
->floatn_nx_idx
);
12078 case cts_dfloat128
:
12079 gcc_assert (!specs
->long_p
&& !specs
->long_long_p
&& !specs
->short_p
12080 && !specs
->signed_p
&& !specs
->unsigned_p
&& !specs
->complex_p
);
12081 if (!targetm
.decimal_float_supported_p ())
12082 specs
->type
= integer_type_node
;
12083 else if (specs
->typespec_word
== cts_dfloat32
)
12084 specs
->type
= dfloat32_type_node
;
12085 else if (specs
->typespec_word
== cts_dfloat64
)
12086 specs
->type
= dfloat64_type_node
;
12088 specs
->type
= dfloat128_type_node
;
12091 gcc_assert (!specs
->complex_p
);
12092 if (!targetm
.fixed_point_supported_p ())
12093 specs
->type
= integer_type_node
;
12094 else if (specs
->saturating_p
)
12096 if (specs
->long_long_p
)
12097 specs
->type
= specs
->unsigned_p
12098 ? sat_unsigned_long_long_fract_type_node
12099 : sat_long_long_fract_type_node
;
12100 else if (specs
->long_p
)
12101 specs
->type
= specs
->unsigned_p
12102 ? sat_unsigned_long_fract_type_node
12103 : sat_long_fract_type_node
;
12104 else if (specs
->short_p
)
12105 specs
->type
= specs
->unsigned_p
12106 ? sat_unsigned_short_fract_type_node
12107 : sat_short_fract_type_node
;
12109 specs
->type
= specs
->unsigned_p
12110 ? sat_unsigned_fract_type_node
12111 : sat_fract_type_node
;
12115 if (specs
->long_long_p
)
12116 specs
->type
= specs
->unsigned_p
12117 ? unsigned_long_long_fract_type_node
12118 : long_long_fract_type_node
;
12119 else if (specs
->long_p
)
12120 specs
->type
= specs
->unsigned_p
12121 ? unsigned_long_fract_type_node
12122 : long_fract_type_node
;
12123 else if (specs
->short_p
)
12124 specs
->type
= specs
->unsigned_p
12125 ? unsigned_short_fract_type_node
12126 : short_fract_type_node
;
12128 specs
->type
= specs
->unsigned_p
12129 ? unsigned_fract_type_node
12134 gcc_assert (!specs
->complex_p
);
12135 if (!targetm
.fixed_point_supported_p ())
12136 specs
->type
= integer_type_node
;
12137 else if (specs
->saturating_p
)
12139 if (specs
->long_long_p
)
12140 specs
->type
= specs
->unsigned_p
12141 ? sat_unsigned_long_long_accum_type_node
12142 : sat_long_long_accum_type_node
;
12143 else if (specs
->long_p
)
12144 specs
->type
= specs
->unsigned_p
12145 ? sat_unsigned_long_accum_type_node
12146 : sat_long_accum_type_node
;
12147 else if (specs
->short_p
)
12148 specs
->type
= specs
->unsigned_p
12149 ? sat_unsigned_short_accum_type_node
12150 : sat_short_accum_type_node
;
12152 specs
->type
= specs
->unsigned_p
12153 ? sat_unsigned_accum_type_node
12154 : sat_accum_type_node
;
12158 if (specs
->long_long_p
)
12159 specs
->type
= specs
->unsigned_p
12160 ? unsigned_long_long_accum_type_node
12161 : long_long_accum_type_node
;
12162 else if (specs
->long_p
)
12163 specs
->type
= specs
->unsigned_p
12164 ? unsigned_long_accum_type_node
12165 : long_accum_type_node
;
12166 else if (specs
->short_p
)
12167 specs
->type
= specs
->unsigned_p
12168 ? unsigned_short_accum_type_node
12169 : short_accum_type_node
;
12171 specs
->type
= specs
->unsigned_p
12172 ? unsigned_accum_type_node
12177 gcc_unreachable ();
12179 handle_postfix_attrs
:
12180 if (specs
->type
!= NULL
)
12182 specs
->postfix_attrs
= c_warn_type_attributes (specs
->postfix_attrs
);
12183 decl_attributes (&specs
->type
, specs
->postfix_attrs
, 0);
12184 specs
->postfix_attrs
= NULL_TREE
;
12190 /* Perform final processing on one file scope's declarations (or the
12191 external scope's declarations), GLOBALS. */
12194 c_write_global_declarations_1 (tree globals
)
12199 /* Process the decls in the order they were written. */
12200 for (decl
= globals
; decl
; decl
= DECL_CHAIN (decl
))
12202 /* Check for used but undefined static functions using the C
12203 standard's definition of "used", and set TREE_NO_WARNING so
12204 that check_global_declaration doesn't repeat the check. */
12205 if (TREE_CODE (decl
) == FUNCTION_DECL
12206 && DECL_INITIAL (decl
) == NULL_TREE
12207 && DECL_EXTERNAL (decl
)
12208 && !TREE_PUBLIC (decl
))
12210 if (C_DECL_USED (decl
))
12212 /* TODO: Add OPT_Wundefined-inline. */
12213 if (pedwarn (input_location
, 0, "%q+F used but never defined",
12215 suppress_warning (decl
/* OPT_Wundefined-inline. */);
12217 /* For -Wunused-function warn about unused static prototypes. */
12218 else if (warn_unused_function
12219 && ! DECL_ARTIFICIAL (decl
)
12220 && ! warning_suppressed_p (decl
, OPT_Wunused_function
))
12222 if (warning (OPT_Wunused_function
,
12223 "%q+F declared %<static%> but never defined",
12225 suppress_warning (decl
, OPT_Wunused_function
);
12229 wrapup_global_declaration_1 (decl
);
12234 reconsider
= false;
12235 for (decl
= globals
; decl
; decl
= DECL_CHAIN (decl
))
12236 reconsider
|= wrapup_global_declaration_2 (decl
);
12238 while (reconsider
);
12241 /* Preserve the external declarations scope across a garbage collect. */
12242 static GTY(()) tree ext_block
;
12244 /* Collect all references relevant to SOURCE_FILE. */
12247 collect_all_refs (const char *source_file
)
12252 FOR_EACH_VEC_ELT (*all_translation_units
, i
, t
)
12253 collect_ada_nodes (BLOCK_VARS (DECL_INITIAL (t
)), source_file
);
12255 collect_ada_nodes (BLOCK_VARS (ext_block
), source_file
);
12258 /* Collect source file references at global level. */
12261 collect_source_refs (void)
12268 FOR_EACH_VEC_ELT (*all_translation_units
, i
, t
)
12270 decls
= DECL_INITIAL (t
);
12271 for (decl
= BLOCK_VARS (decls
); decl
; decl
= TREE_CHAIN (decl
))
12272 if (!DECL_IS_UNDECLARED_BUILTIN (decl
))
12273 collect_source_ref (DECL_SOURCE_FILE (decl
));
12276 for (decl
= BLOCK_VARS (ext_block
); decl
; decl
= TREE_CHAIN (decl
))
12277 if (!DECL_IS_UNDECLARED_BUILTIN (decl
))
12278 collect_source_ref (DECL_SOURCE_FILE (decl
));
12281 /* Free attribute access data that are not needed by the middle end. */
12284 free_attr_access_data ()
12286 struct cgraph_node
*n
;
12288 /* Iterate over all functions declared in the translation unit. */
12289 FOR_EACH_FUNCTION (n
)
12291 for (tree parm
= DECL_ARGUMENTS (n
->decl
); parm
; parm
= TREE_CHAIN (parm
))
12292 if (tree attrs
= DECL_ATTRIBUTES (parm
))
12293 attr_access::free_lang_data (attrs
);
12295 tree fntype
= TREE_TYPE (n
->decl
);
12296 if (!fntype
|| fntype
== error_mark_node
)
12298 tree attrs
= TYPE_ATTRIBUTES (fntype
);
12302 attr_access::free_lang_data (attrs
);
12306 /* Perform any final parser cleanups and generate initial debugging
12310 c_parse_final_cleanups (void)
12315 /* We don't want to do this if generating a PCH. */
12319 timevar_stop (TV_PHASE_PARSING
);
12320 timevar_start (TV_PHASE_DEFERRED
);
12322 /* Do the Objective-C stuff. This is where all the Objective-C
12323 module stuff gets generated (symtab, class/protocol/selector
12325 if (c_dialect_objc ())
12326 objc_write_global_declarations ();
12328 /* Close the external scope. */
12329 ext_block
= pop_scope ();
12330 external_scope
= 0;
12331 gcc_assert (!current_scope
);
12333 /* Handle -fdump-ada-spec[-slim]. */
12334 if (flag_dump_ada_spec
|| flag_dump_ada_spec_slim
)
12336 /* Build a table of files to generate specs for */
12337 collect_source_ref (main_input_filename
);
12338 if (!flag_dump_ada_spec_slim
)
12339 collect_source_refs ();
12341 dump_ada_specs (collect_all_refs
, NULL
);
12344 /* Process all file scopes in this compilation, and the external_scope,
12345 through wrapup_global_declarations. */
12346 FOR_EACH_VEC_ELT (*all_translation_units
, i
, t
)
12347 c_write_global_declarations_1 (BLOCK_VARS (DECL_INITIAL (t
)));
12348 c_write_global_declarations_1 (BLOCK_VARS (ext_block
));
12351 free_attr_access_data ();
12353 timevar_stop (TV_PHASE_DEFERRED
);
12354 timevar_start (TV_PHASE_PARSING
);
12359 /* Register reserved keyword WORD as qualifier for address space AS. */
12362 c_register_addr_space (const char *word
, addr_space_t as
)
12364 int rid
= RID_FIRST_ADDR_SPACE
+ as
;
12367 /* Address space qualifiers are only supported
12368 in C with GNU extensions enabled. */
12369 if (c_dialect_objc () || flag_no_asm
)
12372 id
= get_identifier (word
);
12373 C_SET_RID_CODE (id
, rid
);
12374 C_IS_RESERVED_WORD (id
) = 1;
12375 ridpointers
[rid
] = id
;
12378 /* Return identifier to look up for omp declare reduction. */
12381 c_omp_reduction_id (enum tree_code reduction_code
, tree reduction_id
)
12383 const char *p
= NULL
;
12384 switch (reduction_code
)
12386 case PLUS_EXPR
: p
= "+"; break;
12387 case MULT_EXPR
: p
= "*"; break;
12388 case MINUS_EXPR
: p
= "-"; break;
12389 case BIT_AND_EXPR
: p
= "&"; break;
12390 case BIT_XOR_EXPR
: p
= "^"; break;
12391 case BIT_IOR_EXPR
: p
= "|"; break;
12392 case TRUTH_ANDIF_EXPR
: p
= "&&"; break;
12393 case TRUTH_ORIF_EXPR
: p
= "||"; break;
12394 case MIN_EXPR
: p
= "min"; break;
12395 case MAX_EXPR
: p
= "max"; break;
12402 if (TREE_CODE (reduction_id
) != IDENTIFIER_NODE
)
12403 return error_mark_node
;
12404 p
= IDENTIFIER_POINTER (reduction_id
);
12407 const char prefix
[] = "omp declare reduction ";
12408 size_t lenp
= sizeof (prefix
);
12409 size_t len
= strlen (p
);
12410 char *name
= XALLOCAVEC (char, lenp
+ len
);
12411 memcpy (name
, prefix
, lenp
- 1);
12412 memcpy (name
+ lenp
- 1, p
, len
+ 1);
12413 return get_identifier (name
);
12416 /* Lookup REDUCTION_ID in the current scope, or create an artificial
12417 VAR_DECL, bind it into the current scope and return it. */
12420 c_omp_reduction_decl (tree reduction_id
)
12422 struct c_binding
*b
= I_SYMBOL_BINDING (reduction_id
);
12423 if (b
!= NULL
&& B_IN_CURRENT_SCOPE (b
))
12426 tree decl
= build_decl (BUILTINS_LOCATION
, VAR_DECL
,
12427 reduction_id
, integer_type_node
);
12428 DECL_ARTIFICIAL (decl
) = 1;
12429 DECL_EXTERNAL (decl
) = 1;
12430 TREE_STATIC (decl
) = 1;
12431 TREE_PUBLIC (decl
) = 0;
12432 bind (reduction_id
, decl
, current_scope
, true, false, BUILTINS_LOCATION
);
12436 /* Lookup REDUCTION_ID in the first scope where it has entry for TYPE. */
12439 c_omp_reduction_lookup (tree reduction_id
, tree type
)
12441 struct c_binding
*b
= I_SYMBOL_BINDING (reduction_id
);
12445 for (t
= DECL_INITIAL (b
->decl
); t
; t
= TREE_CHAIN (t
))
12446 if (comptypes (TREE_PURPOSE (t
), type
))
12447 return TREE_VALUE (t
);
12450 return error_mark_node
;
12453 /* Helper function called via walk_tree, to diagnose invalid
12454 #pragma omp declare reduction combiners or initializers. */
12457 c_check_omp_declare_reduction_r (tree
*tp
, int *, void *data
)
12459 tree
*vars
= (tree
*) data
;
12460 if (SSA_VAR_P (*tp
)
12461 && !DECL_ARTIFICIAL (*tp
)
12465 location_t loc
= DECL_SOURCE_LOCATION (vars
[0]);
12466 if (strcmp (IDENTIFIER_POINTER (DECL_NAME (vars
[0])), "omp_out") == 0)
12467 error_at (loc
, "%<#pragma omp declare reduction%> combiner refers to "
12468 "variable %qD which is not %<omp_out%> nor %<omp_in%>",
12471 error_at (loc
, "%<#pragma omp declare reduction%> initializer refers "
12472 "to variable %qD which is not %<omp_priv%> nor "
12482 c_check_in_current_scope (tree decl
)
12484 struct c_binding
*b
= I_SYMBOL_BINDING (DECL_NAME (decl
));
12485 return b
!= NULL
&& B_IN_CURRENT_SCOPE (b
);
12488 #include "gt-c-c-decl.h"