1 /* Process declarations and variables for C compiler.
2 Copyright (C) 1988-2015 Free Software Foundation, Inc.
4 This file is part of GCC.
6 GCC is free software; you can redistribute it and/or modify it under
7 the terms of the GNU General Public License as published by the Free
8 Software Foundation; either version 3, or (at your option) any later
11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 You should have received a copy of the GNU General Public License
17 along with GCC; see the file COPYING3. If not see
18 <http://www.gnu.org/licenses/>. */
20 /* Process declarations and symbol lookup for C front end.
21 Also constructs types; the standard scalar types at initialization,
22 and structure, union, array and enum types when they are declared. */
24 /* ??? not all decl nodes are given the most useful possible
25 line numbers. For example, the CONST_DECLs for enum values. */
29 #include "coretypes.h"
40 #include "fold-const.h"
41 #include "print-tree.h"
42 #include "stor-layout.h"
45 #include "stringpool.h"
46 #include "tree-inline.h"
51 #include "hard-reg-set.h"
61 #include "c-family/c-common.h"
62 #include "c-family/c-objc.h"
63 #include "c-family/c-pragma.h"
64 #include "c-family/c-ubsan.h"
66 #include "langhooks.h"
67 #include "tree-iterator.h"
68 #include "diagnostic-core.h"
72 #include "plugin-api.h"
75 #include "hash-table.h"
76 #include "langhooks-def.h"
78 #include "c-family/c-ada-spec.h"
82 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
84 { NORMAL
, /* Ordinary declaration */
85 FUNCDEF
, /* Function definition */
86 PARM
, /* Declaration of parm before function body */
87 FIELD
, /* Declaration inside struct or union */
88 TYPENAME
}; /* Typename (inside cast or sizeof) */
90 /* States indicating how grokdeclarator() should handle declspecs marked
91 with __attribute__((deprecated)). An object declared as
92 __attribute__((deprecated)) suppresses warnings of uses of other
95 enum deprecated_states
{
101 /* Nonzero if we have seen an invalid cross reference
102 to a struct, union, or enum, but not yet printed the message. */
103 tree pending_invalid_xref
;
105 /* File and line to appear in the eventual error message. */
106 location_t pending_invalid_xref_location
;
108 /* The file and line that the prototype came from if this is an
109 old-style definition; used for diagnostics in
110 store_parm_decls_oldstyle. */
112 static location_t current_function_prototype_locus
;
114 /* Whether this prototype was built-in. */
116 static bool current_function_prototype_built_in
;
118 /* The argument type information of this prototype. */
120 static tree current_function_prototype_arg_types
;
122 /* The argument information structure for the function currently being
125 static struct c_arg_info
*current_function_arg_info
;
127 /* The obstack on which parser and related data structures, which are
128 not live beyond their top-level declaration or definition, are
130 struct obstack parser_obstack
;
132 /* The current statement tree. */
134 static GTY(()) struct stmt_tree_s c_stmt_tree
;
136 /* State saving variables. */
140 /* A list of decls to be made automatically visible in each file scope. */
141 static GTY(()) tree visible_builtins
;
143 /* Set to 0 at beginning of a function definition, set to 1 if
144 a return statement that specifies a return value is seen. */
146 int current_function_returns_value
;
148 /* Set to 0 at beginning of a function definition, set to 1 if
149 a return statement with no argument is seen. */
151 int current_function_returns_null
;
153 /* Set to 0 at beginning of a function definition, set to 1 if
154 a call to a noreturn function is seen. */
156 int current_function_returns_abnormally
;
158 /* Set to nonzero by `grokdeclarator' for a function
159 whose return type is defaulted, if warnings for this are desired. */
161 static int warn_about_return_type
;
163 /* Nonzero when the current toplevel function contains a declaration
164 of a nested function which is never defined. */
166 static bool undef_nested_function
;
168 /* If non-zero, implicit "omp declare target" attribute is added into the
170 int current_omp_declare_target_attribute
;
172 /* Each c_binding structure describes one binding of an identifier to
173 a decl. All the decls in a scope - irrespective of namespace - are
174 chained together by the ->prev field, which (as the name implies)
175 runs in reverse order. All the decls in a given namespace bound to
176 a given identifier are chained by the ->shadowed field, which runs
177 from inner to outer scopes.
179 The ->decl field usually points to a DECL node, but there are two
180 exceptions. In the namespace of type tags, the bound entity is a
181 RECORD_TYPE, UNION_TYPE, or ENUMERAL_TYPE node. If an undeclared
182 identifier is encountered, it is bound to error_mark_node to
183 suppress further errors about that identifier in the current
186 The ->u.type field stores the type of the declaration in this scope;
187 if NULL, the type is the type of the ->decl field. This is only of
188 relevance for objects with external or internal linkage which may
189 be redeclared in inner scopes, forming composite types that only
190 persist for the duration of those scopes. In the external scope,
191 this stores the composite of all the types declared for this
192 object, visible or not. The ->inner_comp field (used only at file
193 scope) stores whether an incomplete array type at file scope was
194 completed at an inner scope to an array size other than 1.
196 The ->u.label field is used for labels. It points to a structure
197 which stores additional information used for warnings.
199 The depth field is copied from the scope structure that holds this
200 decl. It is used to preserve the proper ordering of the ->shadowed
201 field (see bind()) and also for a handful of special-case checks.
202 Finally, the invisible bit is true for a decl which should be
203 ignored for purposes of normal name lookup, and the nested bit is
204 true for a decl that's been bound a second time in an inner scope;
205 in all such cases, the binding in the outer scope will have its
206 invisible bit true. */
208 struct GTY((chain_next ("%h.prev"))) c_binding
{
209 union GTY(()) { /* first so GTY desc can use decl */
210 tree
GTY((tag ("0"))) type
; /* the type in this scope */
211 struct c_label_vars
* GTY((tag ("1"))) label
; /* for warnings */
212 } GTY((desc ("TREE_CODE (%0.decl) == LABEL_DECL"))) u
;
213 tree decl
; /* the decl bound */
214 tree id
; /* the identifier it's bound to */
215 struct c_binding
*prev
; /* the previous decl in this scope */
216 struct c_binding
*shadowed
; /* the innermost decl shadowed by this one */
217 unsigned int depth
: 28; /* depth of this scope */
218 BOOL_BITFIELD invisible
: 1; /* normal lookup should ignore this binding */
219 BOOL_BITFIELD nested
: 1; /* do not set DECL_CONTEXT when popping */
220 BOOL_BITFIELD inner_comp
: 1; /* incomplete array completed in inner scope */
221 BOOL_BITFIELD in_struct
: 1; /* currently defined as struct field */
222 location_t locus
; /* location for nested bindings */
224 #define B_IN_SCOPE(b1, b2) ((b1)->depth == (b2)->depth)
225 #define B_IN_CURRENT_SCOPE(b) ((b)->depth == current_scope->depth)
226 #define B_IN_FILE_SCOPE(b) ((b)->depth == 1 /*file_scope->depth*/)
227 #define B_IN_EXTERNAL_SCOPE(b) ((b)->depth == 0 /*external_scope->depth*/)
229 /* Each C symbol points to three linked lists of c_binding structures.
230 These describe the values of the identifier in the three different
231 namespaces defined by the language. */
233 struct GTY(()) lang_identifier
{
234 struct c_common_identifier common_id
;
235 struct c_binding
*symbol_binding
; /* vars, funcs, constants, typedefs */
236 struct c_binding
*tag_binding
; /* struct/union/enum tags */
237 struct c_binding
*label_binding
; /* labels */
240 /* Validate c-lang.c's assumptions. */
241 extern char C_SIZEOF_STRUCT_LANG_IDENTIFIER_isnt_accurate
242 [(sizeof(struct lang_identifier
) == C_SIZEOF_STRUCT_LANG_IDENTIFIER
) ? 1 : -1];
244 /* The binding oracle; see c-tree.h. */
245 void (*c_binding_oracle
) (enum c_oracle_request
, tree identifier
);
247 /* This flag is set on an identifier if we have previously asked the
248 binding oracle for this identifier's symbol binding. */
249 #define I_SYMBOL_CHECKED(node) \
250 (TREE_LANG_FLAG_4 (IDENTIFIER_NODE_CHECK (node)))
252 static inline struct c_binding
* *
253 i_symbol_binding (tree node
)
255 struct lang_identifier
*lid
256 = (struct lang_identifier
*) IDENTIFIER_NODE_CHECK (node
);
258 if (lid
->symbol_binding
== NULL
259 && c_binding_oracle
!= NULL
260 && !I_SYMBOL_CHECKED (node
))
262 /* Set the "checked" flag first, to avoid infinite recursion
263 when the binding oracle calls back into gcc. */
264 I_SYMBOL_CHECKED (node
) = 1;
265 c_binding_oracle (C_ORACLE_SYMBOL
, node
);
268 return &lid
->symbol_binding
;
271 #define I_SYMBOL_BINDING(node) (*i_symbol_binding (node))
273 #define I_SYMBOL_DECL(node) \
274 (I_SYMBOL_BINDING(node) ? I_SYMBOL_BINDING(node)->decl : 0)
276 /* This flag is set on an identifier if we have previously asked the
277 binding oracle for this identifier's tag binding. */
278 #define I_TAG_CHECKED(node) \
279 (TREE_LANG_FLAG_5 (IDENTIFIER_NODE_CHECK (node)))
281 static inline struct c_binding
**
282 i_tag_binding (tree node
)
284 struct lang_identifier
*lid
285 = (struct lang_identifier
*) IDENTIFIER_NODE_CHECK (node
);
287 if (lid
->tag_binding
== NULL
288 && c_binding_oracle
!= NULL
289 && !I_TAG_CHECKED (node
))
291 /* Set the "checked" flag first, to avoid infinite recursion
292 when the binding oracle calls back into gcc. */
293 I_TAG_CHECKED (node
) = 1;
294 c_binding_oracle (C_ORACLE_TAG
, node
);
297 return &lid
->tag_binding
;
300 #define I_TAG_BINDING(node) (*i_tag_binding (node))
302 #define I_TAG_DECL(node) \
303 (I_TAG_BINDING(node) ? I_TAG_BINDING(node)->decl : 0)
305 /* This flag is set on an identifier if we have previously asked the
306 binding oracle for this identifier's label binding. */
307 #define I_LABEL_CHECKED(node) \
308 (TREE_LANG_FLAG_6 (IDENTIFIER_NODE_CHECK (node)))
310 static inline struct c_binding
**
311 i_label_binding (tree node
)
313 struct lang_identifier
*lid
314 = (struct lang_identifier
*) IDENTIFIER_NODE_CHECK (node
);
316 if (lid
->label_binding
== NULL
317 && c_binding_oracle
!= NULL
318 && !I_LABEL_CHECKED (node
))
320 /* Set the "checked" flag first, to avoid infinite recursion
321 when the binding oracle calls back into gcc. */
322 I_LABEL_CHECKED (node
) = 1;
323 c_binding_oracle (C_ORACLE_LABEL
, node
);
326 return &lid
->label_binding
;
329 #define I_LABEL_BINDING(node) (*i_label_binding (node))
331 #define I_LABEL_DECL(node) \
332 (I_LABEL_BINDING(node) ? I_LABEL_BINDING(node)->decl : 0)
334 /* The resulting tree type. */
336 union GTY((desc ("TREE_CODE (&%h.generic) == IDENTIFIER_NODE"),
337 chain_next ("(union lang_tree_node *) c_tree_chain_next (&%h.generic)"))) lang_tree_node
339 union tree_node
GTY ((tag ("0"),
340 desc ("tree_node_structure (&%h)")))
342 struct lang_identifier
GTY ((tag ("1"))) identifier
;
345 /* Track bindings and other things that matter for goto warnings. For
346 efficiency, we do not gather all the decls at the point of
347 definition. Instead, we point into the bindings structure. As
348 scopes are popped, we update these structures and gather the decls
349 that matter at that time. */
351 struct GTY(()) c_spot_bindings
{
352 /* The currently open scope which holds bindings defined when the
353 label was defined or the goto statement was found. */
354 struct c_scope
*scope
;
355 /* The bindings in the scope field which were defined at the point
356 of the label or goto. This lets us look at older or newer
357 bindings in the scope, as appropriate. */
358 struct c_binding
*bindings_in_scope
;
359 /* The number of statement expressions that have started since this
360 label or goto statement was defined. This is zero if we are at
361 the same statement expression level. It is positive if we are in
362 a statement expression started since this spot. It is negative
363 if this spot was in a statement expression and we have left
366 /* Whether we started in a statement expression but are no longer in
367 it. This is set to true if stmt_exprs ever goes negative. */
371 /* This structure is used to keep track of bindings seen when a goto
372 statement is defined. This is only used if we see the goto
373 statement before we see the label. */
375 struct GTY(()) c_goto_bindings
{
376 /* The location of the goto statement. */
378 /* The bindings of the goto statement. */
379 struct c_spot_bindings goto_bindings
;
382 typedef struct c_goto_bindings
*c_goto_bindings_p
;
384 /* The additional information we keep track of for a label binding.
385 These fields are updated as scopes are popped. */
387 struct GTY(()) c_label_vars
{
388 /* The shadowed c_label_vars, when one label shadows another (which
389 can only happen using a __label__ declaration). */
390 struct c_label_vars
*shadowed
;
391 /* The bindings when the label was defined. */
392 struct c_spot_bindings label_bindings
;
393 /* A list of decls that we care about: decls about which we should
394 warn if a goto branches to this label from later in the function.
395 Decls are added to this list as scopes are popped. We only add
396 the decls that matter. */
397 vec
<tree
, va_gc
> *decls_in_scope
;
398 /* A list of goto statements to this label. This is only used for
399 goto statements seen before the label was defined, so that we can
400 issue appropriate warnings for them. */
401 vec
<c_goto_bindings_p
, va_gc
> *gotos
;
404 /* Each c_scope structure describes the complete contents of one
405 scope. Four scopes are distinguished specially: the innermost or
406 current scope, the innermost function scope, the file scope (always
407 the second to outermost) and the outermost or external scope.
409 Most declarations are recorded in the current scope.
411 All normal label declarations are recorded in the innermost
412 function scope, as are bindings of undeclared identifiers to
413 error_mark_node. (GCC permits nested functions as an extension,
414 hence the 'innermost' qualifier.) Explicitly declared labels
415 (using the __label__ extension) appear in the current scope.
417 Being in the file scope (current_scope == file_scope) causes
418 special behavior in several places below. Also, under some
419 conditions the Objective-C front end records declarations in the
420 file scope even though that isn't the current scope.
422 All declarations with external linkage are recorded in the external
423 scope, even if they aren't visible there; this models the fact that
424 such declarations are visible to the entire program, and (with a
425 bit of cleverness, see pushdecl) allows diagnosis of some violations
426 of C99 6.2.2p7 and 6.2.7p2:
428 If, within the same translation unit, the same identifier appears
429 with both internal and external linkage, the behavior is
432 All declarations that refer to the same object or function shall
433 have compatible type; otherwise, the behavior is undefined.
435 Initially only the built-in declarations, which describe compiler
436 intrinsic functions plus a subset of the standard library, are in
439 The order of the blocks list matters, and it is frequently appended
440 to. To avoid having to walk all the way to the end of the list on
441 each insertion, or reverse the list later, we maintain a pointer to
442 the last list entry. (FIXME: It should be feasible to use a reversed
445 The bindings list is strictly in reverse order of declarations;
446 pop_scope relies on this. */
449 struct GTY((chain_next ("%h.outer"))) c_scope
{
450 /* The scope containing this one. */
451 struct c_scope
*outer
;
453 /* The next outermost function scope. */
454 struct c_scope
*outer_function
;
456 /* All bindings in this scope. */
457 struct c_binding
*bindings
;
459 /* For each scope (except the global one), a chain of BLOCK nodes
460 for all the scopes that were entered and exited one level down. */
464 /* The depth of this scope. Used to keep the ->shadowed chain of
465 bindings sorted innermost to outermost. */
466 unsigned int depth
: 28;
468 /* True if we are currently filling this scope with parameter
470 BOOL_BITFIELD parm_flag
: 1;
472 /* True if we saw [*] in this scope. Used to give an error messages
473 if these appears in a function definition. */
474 BOOL_BITFIELD had_vla_unspec
: 1;
476 /* True if we already complained about forward parameter decls
477 in this scope. This prevents double warnings on
478 foo (int a; int b; ...) */
479 BOOL_BITFIELD warned_forward_parm_decls
: 1;
481 /* True if this is the outermost block scope of a function body.
482 This scope contains the parameters, the local variables declared
483 in the outermost block, and all the labels (except those in
484 nested functions, or declared at block scope with __label__). */
485 BOOL_BITFIELD function_body
: 1;
487 /* True means make a BLOCK for this scope no matter what. */
488 BOOL_BITFIELD keep
: 1;
490 /* True means that an unsuffixed float constant is _Decimal64. */
491 BOOL_BITFIELD float_const_decimal64
: 1;
493 /* True if this scope has any label bindings. This is used to speed
494 up searching for labels when popping scopes, particularly since
495 labels are normally only found at function scope. */
496 BOOL_BITFIELD has_label_bindings
: 1;
498 /* True if we should issue a warning if a goto statement crosses any
499 of the bindings. We still need to check the list of bindings to
500 find the specific ones we need to warn about. This is true if
501 decl_jump_unsafe would return true for any of the bindings. This
502 is used to avoid looping over all the bindings unnecessarily. */
503 BOOL_BITFIELD has_jump_unsafe_decl
: 1;
506 /* The scope currently in effect. */
508 static GTY(()) struct c_scope
*current_scope
;
510 /* The innermost function scope. Ordinary (not explicitly declared)
511 labels, bindings to error_mark_node, and the lazily-created
512 bindings of __func__ and its friends get this scope. */
514 static GTY(()) struct c_scope
*current_function_scope
;
516 /* The C file scope. This is reset for each input translation unit. */
518 static GTY(()) struct c_scope
*file_scope
;
520 /* The outermost scope. This is used for all declarations with
521 external linkage, and only these, hence the name. */
523 static GTY(()) struct c_scope
*external_scope
;
525 /* A chain of c_scope structures awaiting reuse. */
527 static GTY((deletable
)) struct c_scope
*scope_freelist
;
529 /* A chain of c_binding structures awaiting reuse. */
531 static GTY((deletable
)) struct c_binding
*binding_freelist
;
533 /* Append VAR to LIST in scope SCOPE. */
534 #define SCOPE_LIST_APPEND(scope, list, decl) do { \
535 struct c_scope *s_ = (scope); \
537 if (s_->list##_last) \
538 BLOCK_CHAIN (s_->list##_last) = d_; \
541 s_->list##_last = d_; \
544 /* Concatenate FROM in scope FSCOPE onto TO in scope TSCOPE. */
545 #define SCOPE_LIST_CONCAT(tscope, to, fscope, from) do { \
546 struct c_scope *t_ = (tscope); \
547 struct c_scope *f_ = (fscope); \
549 BLOCK_CHAIN (t_->to##_last) = f_->from; \
552 t_->to##_last = f_->from##_last; \
555 /* A c_inline_static structure stores details of a static identifier
556 referenced in a definition of a function that may be an inline
557 definition if no subsequent declaration of that function uses
558 "extern" or does not use "inline". */
560 struct GTY((chain_next ("%h.next"))) c_inline_static
{
561 /* The location for a diagnostic. */
564 /* The function that may be an inline definition. */
567 /* The object or function referenced. */
570 /* What sort of reference this is. */
571 enum c_inline_static_type type
;
573 /* The next such structure or NULL. */
574 struct c_inline_static
*next
;
577 /* List of static identifiers used or referenced in functions that may
578 be inline definitions. */
579 static GTY(()) struct c_inline_static
*c_inline_statics
;
581 /* True means unconditionally make a BLOCK for the next scope pushed. */
583 static bool keep_next_level_flag
;
585 /* True means the next call to push_scope will be the outermost scope
586 of a function body, so do not push a new scope, merely cease
587 expecting parameter decls. */
589 static bool next_is_function_body
;
591 /* A vector of pointers to c_binding structures. */
593 typedef struct c_binding
*c_binding_ptr
;
595 /* Information that we keep for a struct or union while it is being
598 struct c_struct_parse_info
600 /* If warn_cxx_compat, a list of types defined within this
602 vec
<tree
> struct_types
;
603 /* If warn_cxx_compat, a list of field names which have bindings,
604 and which are defined in this struct, but which are not defined
605 in any enclosing struct. This is used to clear the in_struct
606 field of the c_bindings structure. */
607 vec
<c_binding_ptr
> fields
;
608 /* If warn_cxx_compat, a list of typedef names used when defining
609 fields in this struct. */
610 vec
<tree
> typedefs_seen
;
613 /* Information for the struct or union currently being parsed, or
614 NULL if not parsing a struct or union. */
615 static struct c_struct_parse_info
*struct_parse_info
;
617 /* Forward declarations. */
618 static tree
lookup_name_in_scope (tree
, struct c_scope
*);
619 static tree
c_make_fname_decl (location_t
, tree
, int);
620 static tree
grokdeclarator (const struct c_declarator
*,
621 struct c_declspecs
*,
622 enum decl_context
, bool, tree
*, tree
*, tree
*,
623 bool *, enum deprecated_states
);
624 static tree
grokparms (struct c_arg_info
*, bool);
625 static void layout_array_type (tree
);
626 static void warn_defaults_to (location_t
, int, const char *, ...)
627 ATTRIBUTE_GCC_DIAG(3,4);
629 /* T is a statement. Add it to the statement-tree. This is the
630 C/ObjC version--C++ has a slightly different version of this
636 enum tree_code code
= TREE_CODE (t
);
638 if (CAN_HAVE_LOCATION_P (t
) && code
!= LABEL_EXPR
)
640 if (!EXPR_HAS_LOCATION (t
))
641 SET_EXPR_LOCATION (t
, input_location
);
644 if (code
== LABEL_EXPR
|| code
== CASE_LABEL_EXPR
)
645 STATEMENT_LIST_HAS_LABEL (cur_stmt_list
) = 1;
647 /* Add T to the statement-tree. Non-side-effect statements need to be
648 recorded during statement expressions. */
649 if (!building_stmt_list_p ())
651 append_to_statement_list_force (t
, &cur_stmt_list
);
656 /* Build a pointer type using the default pointer mode. */
659 c_build_pointer_type (tree to_type
)
661 addr_space_t as
= to_type
== error_mark_node
? ADDR_SPACE_GENERIC
662 : TYPE_ADDR_SPACE (to_type
);
663 machine_mode pointer_mode
;
665 if (as
!= ADDR_SPACE_GENERIC
|| c_default_pointer_mode
== VOIDmode
)
666 pointer_mode
= targetm
.addr_space
.pointer_mode (as
);
668 pointer_mode
= c_default_pointer_mode
;
669 return build_pointer_type_for_mode (to_type
, pointer_mode
, false);
673 /* Return true if we will want to say something if a goto statement
677 decl_jump_unsafe (tree decl
)
679 if (error_operand_p (decl
))
682 /* Always warn about crossing variably modified types. */
683 if ((TREE_CODE (decl
) == VAR_DECL
|| TREE_CODE (decl
) == TYPE_DECL
)
684 && variably_modified_type_p (TREE_TYPE (decl
), NULL_TREE
))
687 /* Otherwise, only warn if -Wgoto-misses-init and this is an
688 initialized automatic decl. */
689 if (warn_jump_misses_init
690 && TREE_CODE (decl
) == VAR_DECL
691 && !TREE_STATIC (decl
)
692 && DECL_INITIAL (decl
) != NULL_TREE
)
700 c_print_identifier (FILE *file
, tree node
, int indent
)
702 void (*save
) (enum c_oracle_request
, tree identifier
);
704 /* Temporarily hide any binding oracle. Without this, calls to
705 debug_tree from the debugger will end up calling into the oracle,
706 making for a confusing debug session. As the oracle isn't needed
707 here for normal operation, it's simplest to suppress it. */
708 save
= c_binding_oracle
;
709 c_binding_oracle
= NULL
;
711 print_node (file
, "symbol", I_SYMBOL_DECL (node
), indent
+ 4);
712 print_node (file
, "tag", I_TAG_DECL (node
), indent
+ 4);
713 print_node (file
, "label", I_LABEL_DECL (node
), indent
+ 4);
714 if (C_IS_RESERVED_WORD (node
) && C_RID_CODE (node
) != RID_CXX_COMPAT_WARN
)
716 tree rid
= ridpointers
[C_RID_CODE (node
)];
717 indent_to (file
, indent
+ 4);
718 fprintf (file
, "rid " HOST_PTR_PRINTF
" \"%s\"",
719 (void *) rid
, IDENTIFIER_POINTER (rid
));
722 c_binding_oracle
= save
;
725 /* Establish a binding between NAME, an IDENTIFIER_NODE, and DECL,
726 which may be any of several kinds of DECL or TYPE or error_mark_node,
727 in the scope SCOPE. */
729 bind (tree name
, tree decl
, struct c_scope
*scope
, bool invisible
,
730 bool nested
, location_t locus
)
732 struct c_binding
*b
, **here
;
734 if (binding_freelist
)
736 b
= binding_freelist
;
737 binding_freelist
= b
->prev
;
740 b
= ggc_alloc
<c_binding
> ();
745 b
->depth
= scope
->depth
;
746 b
->invisible
= invisible
;
754 b
->prev
= scope
->bindings
;
757 if (decl_jump_unsafe (decl
))
758 scope
->has_jump_unsafe_decl
= 1;
763 switch (TREE_CODE (decl
))
765 case LABEL_DECL
: here
= &I_LABEL_BINDING (name
); break;
768 case RECORD_TYPE
: here
= &I_TAG_BINDING (name
); break;
774 case ERROR_MARK
: here
= &I_SYMBOL_BINDING (name
); break;
780 /* Locate the appropriate place in the chain of shadowed decls
781 to insert this binding. Normally, scope == current_scope and
782 this does nothing. */
783 while (*here
&& (*here
)->depth
> scope
->depth
)
784 here
= &(*here
)->shadowed
;
790 /* Clear the binding structure B, stick it on the binding_freelist,
791 and return the former value of b->prev. This is used by pop_scope
792 and get_parm_info to iterate destructively over all the bindings
793 from a given scope. */
794 static struct c_binding
*
795 free_binding_and_advance (struct c_binding
*b
)
797 struct c_binding
*prev
= b
->prev
;
799 memset (b
, 0, sizeof (struct c_binding
));
800 b
->prev
= binding_freelist
;
801 binding_freelist
= b
;
806 /* Bind a label. Like bind, but skip fields which aren't used for
807 labels, and add the LABEL_VARS value. */
809 bind_label (tree name
, tree label
, struct c_scope
*scope
,
810 struct c_label_vars
*label_vars
)
814 bind (name
, label
, scope
, /*invisible=*/false, /*nested=*/false,
817 scope
->has_label_bindings
= true;
820 gcc_assert (b
->decl
== label
);
821 label_vars
->shadowed
= b
->u
.label
;
822 b
->u
.label
= label_vars
;
825 /* Hook called at end of compilation to assume 1 elt
826 for a file-scope tentative array defn that wasn't complete before. */
829 c_finish_incomplete_decl (tree decl
)
831 if (TREE_CODE (decl
) == VAR_DECL
)
833 tree type
= TREE_TYPE (decl
);
834 if (type
!= error_mark_node
835 && TREE_CODE (type
) == ARRAY_TYPE
836 && !DECL_EXTERNAL (decl
)
837 && TYPE_DOMAIN (type
) == 0)
839 warning_at (DECL_SOURCE_LOCATION (decl
),
840 0, "array %q+D assumed to have one element", decl
);
842 complete_array_type (&TREE_TYPE (decl
), NULL_TREE
, true);
844 relayout_decl (decl
);
849 /* Record that inline function FUNC contains a reference (location
850 LOC) to static DECL (file-scope or function-local according to
854 record_inline_static (location_t loc
, tree func
, tree decl
,
855 enum c_inline_static_type type
)
857 c_inline_static
*csi
= ggc_alloc
<c_inline_static
> ();
859 csi
->function
= func
;
860 csi
->static_decl
= decl
;
862 csi
->next
= c_inline_statics
;
863 c_inline_statics
= csi
;
866 /* Check for references to static declarations in inline functions at
867 the end of the translation unit and diagnose them if the functions
868 are still inline definitions. */
871 check_inline_statics (void)
873 struct c_inline_static
*csi
;
874 for (csi
= c_inline_statics
; csi
; csi
= csi
->next
)
876 if (DECL_EXTERNAL (csi
->function
))
880 pedwarn (csi
->location
, 0,
881 "%qD is static but used in inline function %qD "
882 "which is not static", csi
->static_decl
, csi
->function
);
885 pedwarn (csi
->location
, 0,
886 "%q+D is static but declared in inline function %qD "
887 "which is not static", csi
->static_decl
, csi
->function
);
893 c_inline_statics
= NULL
;
896 /* Fill in a c_spot_bindings structure. If DEFINING is true, set it
897 for the current state, otherwise set it to uninitialized. */
900 set_spot_bindings (struct c_spot_bindings
*p
, bool defining
)
904 p
->scope
= current_scope
;
905 p
->bindings_in_scope
= current_scope
->bindings
;
910 p
->bindings_in_scope
= NULL
;
913 p
->left_stmt_expr
= false;
916 /* Update spot bindings P as we pop out of SCOPE. Return true if we
917 should push decls for a label. */
920 update_spot_bindings (struct c_scope
*scope
, struct c_spot_bindings
*p
)
922 if (p
->scope
!= scope
)
924 /* This label or goto is defined in some other scope, or it is a
925 label which is not yet defined. There is nothing to
930 /* Adjust the spot bindings to refer to the bindings already defined
931 in the enclosing scope. */
932 p
->scope
= scope
->outer
;
933 p
->bindings_in_scope
= p
->scope
->bindings
;
938 /* The Objective-C front-end often needs to determine the current scope. */
941 objc_get_current_scope (void)
943 return current_scope
;
946 /* The following function is used only by Objective-C. It needs to live here
947 because it accesses the innards of c_scope. */
950 objc_mark_locals_volatile (void *enclosing_blk
)
952 struct c_scope
*scope
;
955 for (scope
= current_scope
;
956 scope
&& scope
!= enclosing_blk
;
957 scope
= scope
->outer
)
959 for (b
= scope
->bindings
; b
; b
= b
->prev
)
960 objc_volatilize_decl (b
->decl
);
962 /* Do not climb up past the current function. */
963 if (scope
->function_body
)
968 /* Return true if we are in the global binding level. */
971 global_bindings_p (void)
973 return current_scope
== file_scope
;
977 keep_next_level (void)
979 keep_next_level_flag
= true;
982 /* Set the flag for the FLOAT_CONST_DECIMAL64 pragma being ON. */
985 set_float_const_decimal64 (void)
987 current_scope
->float_const_decimal64
= true;
990 /* Clear the flag for the FLOAT_CONST_DECIMAL64 pragma. */
993 clear_float_const_decimal64 (void)
995 current_scope
->float_const_decimal64
= false;
998 /* Return nonzero if an unsuffixed float constant is _Decimal64. */
1001 float_const_decimal64_p (void)
1003 return current_scope
->float_const_decimal64
;
1006 /* Identify this scope as currently being filled with parameters. */
1009 declare_parm_level (void)
1011 current_scope
->parm_flag
= true;
1017 if (next_is_function_body
)
1019 /* This is the transition from the parameters to the top level
1020 of the function body. These are the same scope
1021 (C99 6.2.1p4,6) so we do not push another scope structure.
1022 next_is_function_body is set only by store_parm_decls, which
1023 in turn is called when and only when we are about to
1024 encounter the opening curly brace for the function body.
1026 The outermost block of a function always gets a BLOCK node,
1027 because the debugging output routines expect that each
1028 function has at least one BLOCK. */
1029 current_scope
->parm_flag
= false;
1030 current_scope
->function_body
= true;
1031 current_scope
->keep
= true;
1032 current_scope
->outer_function
= current_function_scope
;
1033 current_function_scope
= current_scope
;
1035 keep_next_level_flag
= false;
1036 next_is_function_body
= false;
1038 /* The FLOAT_CONST_DECIMAL64 pragma applies to nested scopes. */
1039 if (current_scope
->outer
)
1040 current_scope
->float_const_decimal64
1041 = current_scope
->outer
->float_const_decimal64
;
1043 current_scope
->float_const_decimal64
= false;
1047 struct c_scope
*scope
;
1050 scope
= scope_freelist
;
1051 scope_freelist
= scope
->outer
;
1054 scope
= ggc_cleared_alloc
<c_scope
> ();
1056 /* The FLOAT_CONST_DECIMAL64 pragma applies to nested scopes. */
1058 scope
->float_const_decimal64
= current_scope
->float_const_decimal64
;
1060 scope
->float_const_decimal64
= false;
1062 scope
->keep
= keep_next_level_flag
;
1063 scope
->outer
= current_scope
;
1064 scope
->depth
= current_scope
? (current_scope
->depth
+ 1) : 0;
1066 /* Check for scope depth overflow. Unlikely (2^28 == 268,435,456) but
1068 if (current_scope
&& scope
->depth
== 0)
1071 sorry ("GCC supports only %u nested scopes", scope
->depth
);
1074 current_scope
= scope
;
1075 keep_next_level_flag
= false;
1079 /* This is called when we are leaving SCOPE. For each label defined
1080 in SCOPE, add any appropriate decls to its decls_in_scope fields.
1081 These are the decls whose initialization will be skipped by a goto
1082 later in the function. */
1085 update_label_decls (struct c_scope
*scope
)
1092 if (s
->has_label_bindings
)
1094 struct c_binding
*b
;
1096 for (b
= s
->bindings
; b
!= NULL
; b
= b
->prev
)
1098 struct c_label_vars
*label_vars
;
1099 struct c_binding
*b1
;
1102 struct c_goto_bindings
*g
;
1104 if (TREE_CODE (b
->decl
) != LABEL_DECL
)
1106 label_vars
= b
->u
.label
;
1108 b1
= label_vars
->label_bindings
.bindings_in_scope
;
1109 if (label_vars
->label_bindings
.scope
== NULL
)
1112 hjud
= label_vars
->label_bindings
.scope
->has_jump_unsafe_decl
;
1113 if (update_spot_bindings (scope
, &label_vars
->label_bindings
))
1115 /* This label is defined in this scope. */
1118 for (; b1
!= NULL
; b1
= b1
->prev
)
1120 /* A goto from later in the function to this
1121 label will never see the initialization
1122 of B1, if any. Save it to issue a
1123 warning if needed. */
1124 if (decl_jump_unsafe (b1
->decl
))
1125 vec_safe_push(label_vars
->decls_in_scope
, b1
->decl
);
1130 /* Update the bindings of any goto statements associated
1132 FOR_EACH_VEC_SAFE_ELT (label_vars
->gotos
, ix
, g
)
1133 update_spot_bindings (scope
, &g
->goto_bindings
);
1137 /* Don't search beyond the current function. */
1138 if (s
== current_function_scope
)
1145 /* Set the TYPE_CONTEXT of all of TYPE's variants to CONTEXT. */
1148 set_type_context (tree type
, tree context
)
1150 for (type
= TYPE_MAIN_VARIANT (type
); type
;
1151 type
= TYPE_NEXT_VARIANT (type
))
1152 TYPE_CONTEXT (type
) = context
;
1155 /* Exit a scope. Restore the state of the identifier-decl mappings
1156 that were in effect when this scope was entered. Return a BLOCK
1157 node containing all the DECLs in this scope that are of interest
1158 to debug info generation. */
1163 struct c_scope
*scope
= current_scope
;
1164 tree block
, context
, p
;
1165 struct c_binding
*b
;
1167 bool functionbody
= scope
->function_body
;
1168 bool keep
= functionbody
|| scope
->keep
|| scope
->bindings
;
1170 update_label_decls (scope
);
1172 /* If appropriate, create a BLOCK to record the decls for the life
1173 of this function. */
1177 block
= make_node (BLOCK
);
1178 BLOCK_SUBBLOCKS (block
) = scope
->blocks
;
1179 TREE_USED (block
) = 1;
1181 /* In each subblock, record that this is its superior. */
1182 for (p
= scope
->blocks
; p
; p
= BLOCK_CHAIN (p
))
1183 BLOCK_SUPERCONTEXT (p
) = block
;
1185 BLOCK_VARS (block
) = 0;
1188 /* The TYPE_CONTEXTs for all of the tagged types belonging to this
1189 scope must be set so that they point to the appropriate
1190 construct, i.e. either to the current FUNCTION_DECL node, or
1191 else to the BLOCK node we just constructed.
1193 Note that for tagged types whose scope is just the formal
1194 parameter list for some function type specification, we can't
1195 properly set their TYPE_CONTEXTs here, because we don't have a
1196 pointer to the appropriate FUNCTION_TYPE node readily available
1197 to us. For those cases, the TYPE_CONTEXTs of the relevant tagged
1198 type nodes get set in `grokdeclarator' as soon as we have created
1199 the FUNCTION_TYPE node which will represent the "scope" for these
1200 "parameter list local" tagged types. */
1201 if (scope
->function_body
)
1202 context
= current_function_decl
;
1203 else if (scope
== file_scope
)
1205 tree file_decl
= build_translation_unit_decl (NULL_TREE
);
1206 context
= file_decl
;
1211 /* Clear all bindings in this scope. */
1212 for (b
= scope
->bindings
; b
; b
= free_binding_and_advance (b
))
1215 switch (TREE_CODE (p
))
1218 /* Warnings for unused labels, errors for undefined labels. */
1219 if (TREE_USED (p
) && !DECL_INITIAL (p
))
1221 error ("label %q+D used but not defined", p
);
1222 DECL_INITIAL (p
) = error_mark_node
;
1225 warn_for_unused_label (p
);
1227 /* Labels go in BLOCK_VARS. */
1228 DECL_CHAIN (p
) = BLOCK_VARS (block
);
1229 BLOCK_VARS (block
) = p
;
1230 gcc_assert (I_LABEL_BINDING (b
->id
) == b
);
1231 I_LABEL_BINDING (b
->id
) = b
->shadowed
;
1233 /* Also pop back to the shadowed label_vars. */
1234 release_tree_vector (b
->u
.label
->decls_in_scope
);
1235 b
->u
.label
= b
->u
.label
->shadowed
;
1241 set_type_context (p
, context
);
1243 /* Types may not have tag-names, in which case the type
1244 appears in the bindings list with b->id NULL. */
1247 gcc_assert (I_TAG_BINDING (b
->id
) == b
);
1248 I_TAG_BINDING (b
->id
) = b
->shadowed
;
1253 /* Propagate TREE_ADDRESSABLE from nested functions to their
1254 containing functions. */
1255 if (!TREE_ASM_WRITTEN (p
)
1256 && DECL_INITIAL (p
) != 0
1257 && TREE_ADDRESSABLE (p
)
1258 && DECL_ABSTRACT_ORIGIN (p
) != 0
1259 && DECL_ABSTRACT_ORIGIN (p
) != p
)
1260 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (p
)) = 1;
1261 if (!DECL_EXTERNAL (p
)
1262 && !DECL_INITIAL (p
)
1263 && scope
!= file_scope
1264 && scope
!= external_scope
)
1266 error ("nested function %q+D declared but never defined", p
);
1267 undef_nested_function
= true;
1269 else if (DECL_DECLARED_INLINE_P (p
)
1271 && !DECL_INITIAL (p
))
1273 /* C99 6.7.4p6: "a function with external linkage... declared
1274 with an inline function specifier ... shall also be defined
1275 in the same translation unit." */
1276 if (!flag_gnu89_inline
1277 && !lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (p
))
1278 && scope
!= external_scope
)
1279 pedwarn (input_location
, 0,
1280 "inline function %q+D declared but never defined", p
);
1281 DECL_EXTERNAL (p
) = 1;
1287 /* Warnings for unused variables. */
1288 if ((!TREE_USED (p
) || !DECL_READ_P (p
))
1289 && !TREE_NO_WARNING (p
)
1290 && !DECL_IN_SYSTEM_HEADER (p
)
1292 && !DECL_ARTIFICIAL (p
)
1293 && scope
!= file_scope
1294 && scope
!= external_scope
)
1297 warning (OPT_Wunused_variable
, "unused variable %q+D", p
);
1298 else if (DECL_CONTEXT (p
) == current_function_decl
)
1299 warning_at (DECL_SOURCE_LOCATION (p
),
1300 OPT_Wunused_but_set_variable
,
1301 "variable %qD set but not used", p
);
1306 error ("type of array %q+D completed incompatibly with"
1307 " implicit initialization", p
);
1314 /* All of these go in BLOCK_VARS, but only if this is the
1315 binding in the home scope. */
1318 DECL_CHAIN (p
) = BLOCK_VARS (block
);
1319 BLOCK_VARS (block
) = p
;
1321 else if (VAR_OR_FUNCTION_DECL_P (p
) && scope
!= file_scope
)
1323 /* For block local externs add a special
1324 DECL_EXTERNAL decl for debug info generation. */
1325 tree extp
= copy_node (p
);
1327 DECL_EXTERNAL (extp
) = 1;
1328 TREE_STATIC (extp
) = 0;
1329 TREE_PUBLIC (extp
) = 1;
1330 DECL_INITIAL (extp
) = NULL_TREE
;
1331 DECL_LANG_SPECIFIC (extp
) = NULL
;
1332 DECL_CONTEXT (extp
) = current_function_decl
;
1333 if (TREE_CODE (p
) == FUNCTION_DECL
)
1335 DECL_RESULT (extp
) = NULL_TREE
;
1336 DECL_SAVED_TREE (extp
) = NULL_TREE
;
1337 DECL_STRUCT_FUNCTION (extp
) = NULL
;
1339 if (b
->locus
!= UNKNOWN_LOCATION
)
1340 DECL_SOURCE_LOCATION (extp
) = b
->locus
;
1341 DECL_CHAIN (extp
) = BLOCK_VARS (block
);
1342 BLOCK_VARS (block
) = extp
;
1344 /* If this is the file scope set DECL_CONTEXT of each decl to
1345 the TRANSLATION_UNIT_DECL. This makes same_translation_unit_p
1347 if (scope
== file_scope
)
1349 DECL_CONTEXT (p
) = context
;
1350 if (TREE_CODE (p
) == TYPE_DECL
1351 && TREE_TYPE (p
) != error_mark_node
)
1352 set_type_context (TREE_TYPE (p
), context
);
1356 /* Parameters go in DECL_ARGUMENTS, not BLOCK_VARS, and have
1357 already been put there by store_parm_decls. Unused-
1358 parameter warnings are handled by function.c.
1359 error_mark_node obviously does not go in BLOCK_VARS and
1360 does not get unused-variable warnings. */
1363 /* It is possible for a decl not to have a name. We get
1364 here with b->id NULL in this case. */
1367 gcc_assert (I_SYMBOL_BINDING (b
->id
) == b
);
1368 I_SYMBOL_BINDING (b
->id
) = b
->shadowed
;
1369 if (b
->shadowed
&& b
->shadowed
->u
.type
)
1370 TREE_TYPE (b
->shadowed
->decl
) = b
->shadowed
->u
.type
;
1380 /* Dispose of the block that we just made inside some higher level. */
1381 if ((scope
->function_body
|| scope
== file_scope
) && context
)
1383 DECL_INITIAL (context
) = block
;
1384 BLOCK_SUPERCONTEXT (block
) = context
;
1386 else if (scope
->outer
)
1389 SCOPE_LIST_APPEND (scope
->outer
, blocks
, block
);
1390 /* If we did not make a block for the scope just exited, any
1391 blocks made for inner scopes must be carried forward so they
1392 will later become subblocks of something else. */
1393 else if (scope
->blocks
)
1394 SCOPE_LIST_CONCAT (scope
->outer
, blocks
, scope
, blocks
);
1397 /* Pop the current scope, and free the structure for reuse. */
1398 current_scope
= scope
->outer
;
1399 if (scope
->function_body
)
1400 current_function_scope
= scope
->outer_function
;
1402 memset (scope
, 0, sizeof (struct c_scope
));
1403 scope
->outer
= scope_freelist
;
1404 scope_freelist
= scope
;
1410 push_file_scope (void)
1418 file_scope
= current_scope
;
1420 start_fname_decls ();
1422 for (decl
= visible_builtins
; decl
; decl
= DECL_CHAIN (decl
))
1423 bind (DECL_NAME (decl
), decl
, file_scope
,
1424 /*invisible=*/false, /*nested=*/true, DECL_SOURCE_LOCATION (decl
));
1428 pop_file_scope (void)
1430 /* In case there were missing closebraces, get us back to the global
1432 while (current_scope
!= file_scope
)
1435 /* __FUNCTION__ is defined at file scope (""). This
1436 call may not be necessary as my tests indicate it
1437 still works without it. */
1438 finish_fname_decls ();
1440 check_inline_statics ();
1442 /* This is the point to write out a PCH if we're doing that.
1443 In that case we do not want to do anything else. */
1446 c_common_write_pch ();
1450 /* Pop off the file scope and close this translation unit. */
1454 maybe_apply_pending_pragma_weaks ();
1457 /* Adjust the bindings for the start of a statement expression. */
1460 c_bindings_start_stmt_expr (struct c_spot_bindings
* switch_bindings
)
1462 struct c_scope
*scope
;
1464 for (scope
= current_scope
; scope
!= NULL
; scope
= scope
->outer
)
1466 struct c_binding
*b
;
1468 if (!scope
->has_label_bindings
)
1471 for (b
= scope
->bindings
; b
!= NULL
; b
= b
->prev
)
1473 struct c_label_vars
*label_vars
;
1475 struct c_goto_bindings
*g
;
1477 if (TREE_CODE (b
->decl
) != LABEL_DECL
)
1479 label_vars
= b
->u
.label
;
1480 ++label_vars
->label_bindings
.stmt_exprs
;
1481 FOR_EACH_VEC_SAFE_ELT (label_vars
->gotos
, ix
, g
)
1482 ++g
->goto_bindings
.stmt_exprs
;
1486 if (switch_bindings
!= NULL
)
1487 ++switch_bindings
->stmt_exprs
;
1490 /* Adjust the bindings for the end of a statement expression. */
1493 c_bindings_end_stmt_expr (struct c_spot_bindings
*switch_bindings
)
1495 struct c_scope
*scope
;
1497 for (scope
= current_scope
; scope
!= NULL
; scope
= scope
->outer
)
1499 struct c_binding
*b
;
1501 if (!scope
->has_label_bindings
)
1504 for (b
= scope
->bindings
; b
!= NULL
; b
= b
->prev
)
1506 struct c_label_vars
*label_vars
;
1508 struct c_goto_bindings
*g
;
1510 if (TREE_CODE (b
->decl
) != LABEL_DECL
)
1512 label_vars
= b
->u
.label
;
1513 --label_vars
->label_bindings
.stmt_exprs
;
1514 if (label_vars
->label_bindings
.stmt_exprs
< 0)
1516 label_vars
->label_bindings
.left_stmt_expr
= true;
1517 label_vars
->label_bindings
.stmt_exprs
= 0;
1519 FOR_EACH_VEC_SAFE_ELT (label_vars
->gotos
, ix
, g
)
1521 --g
->goto_bindings
.stmt_exprs
;
1522 if (g
->goto_bindings
.stmt_exprs
< 0)
1524 g
->goto_bindings
.left_stmt_expr
= true;
1525 g
->goto_bindings
.stmt_exprs
= 0;
1531 if (switch_bindings
!= NULL
)
1533 --switch_bindings
->stmt_exprs
;
1534 gcc_assert (switch_bindings
->stmt_exprs
>= 0);
1538 /* Push a definition or a declaration of struct, union or enum tag "name".
1539 "type" should be the type node.
1540 We assume that the tag "name" is not already defined, and has a location
1543 Note that the definition may really be just a forward reference.
1544 In that case, the TYPE_SIZE will be zero. */
1547 pushtag (location_t loc
, tree name
, tree type
)
1549 /* Record the identifier as the type's name if it has none. */
1550 if (name
&& !TYPE_NAME (type
))
1551 TYPE_NAME (type
) = name
;
1552 bind (name
, type
, current_scope
, /*invisible=*/false, /*nested=*/false, loc
);
1554 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1555 tagged type we just added to the current scope. This fake
1556 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1557 to output a representation of a tagged type, and it also gives
1558 us a convenient place to record the "scope start" address for the
1561 TYPE_STUB_DECL (type
) = pushdecl (build_decl (loc
,
1562 TYPE_DECL
, NULL_TREE
, type
));
1564 /* An approximation for now, so we can tell this is a function-scope tag.
1565 This will be updated in pop_scope. */
1566 TYPE_CONTEXT (type
) = DECL_CONTEXT (TYPE_STUB_DECL (type
));
1568 if (warn_cxx_compat
&& name
!= NULL_TREE
)
1570 struct c_binding
*b
= I_SYMBOL_BINDING (name
);
1573 && b
->decl
!= NULL_TREE
1574 && TREE_CODE (b
->decl
) == TYPE_DECL
1575 && (B_IN_CURRENT_SCOPE (b
)
1576 || (current_scope
== file_scope
&& B_IN_EXTERNAL_SCOPE (b
)))
1577 && (TYPE_MAIN_VARIANT (TREE_TYPE (b
->decl
))
1578 != TYPE_MAIN_VARIANT (type
)))
1580 warning_at (loc
, OPT_Wc___compat
,
1581 ("using %qD as both a typedef and a tag is "
1584 if (b
->locus
!= UNKNOWN_LOCATION
)
1585 inform (b
->locus
, "originally defined here");
1590 /* An exported interface to pushtag. This is used by the gdb plugin's
1591 binding oracle to introduce a new tag binding. */
1594 c_pushtag (location_t loc
, tree name
, tree type
)
1596 pushtag (loc
, name
, type
);
1599 /* An exported interface to bind a declaration. LOC is the location
1600 to use. DECL is the declaration to bind. The decl's name is used
1601 to determine how it is bound. If DECL is a VAR_DECL, then
1602 IS_GLOBAL determines whether the decl is put into the global (file
1603 and external) scope or the current function's scope; if DECL is not
1604 a VAR_DECL then it is always put into the file scope. */
1607 c_bind (location_t loc
, tree decl
, bool is_global
)
1609 struct c_scope
*scope
;
1610 bool nested
= false;
1612 if (TREE_CODE (decl
) != VAR_DECL
|| current_function_scope
== NULL
)
1614 /* Types and functions are always considered to be global. */
1616 DECL_EXTERNAL (decl
) = 1;
1617 TREE_PUBLIC (decl
) = 1;
1621 /* Also bind it into the external scope. */
1622 bind (DECL_NAME (decl
), decl
, external_scope
, true, false, loc
);
1625 DECL_EXTERNAL (decl
) = 1;
1626 TREE_PUBLIC (decl
) = 1;
1630 DECL_CONTEXT (decl
) = current_function_decl
;
1631 TREE_PUBLIC (decl
) = 0;
1632 scope
= current_function_scope
;
1635 bind (DECL_NAME (decl
), decl
, scope
, false, nested
, loc
);
1638 /* Subroutine of compare_decls. Allow harmless mismatches in return
1639 and argument types provided that the type modes match. This function
1640 return a unified type given a suitable match, and 0 otherwise. */
1643 match_builtin_function_types (tree newtype
, tree oldtype
)
1645 tree newrettype
, oldrettype
;
1646 tree newargs
, oldargs
;
1647 tree trytype
, tryargs
;
1649 /* Accept the return type of the new declaration if same modes. */
1650 oldrettype
= TREE_TYPE (oldtype
);
1651 newrettype
= TREE_TYPE (newtype
);
1653 if (TYPE_MODE (oldrettype
) != TYPE_MODE (newrettype
))
1656 oldargs
= TYPE_ARG_TYPES (oldtype
);
1657 newargs
= TYPE_ARG_TYPES (newtype
);
1660 while (oldargs
|| newargs
)
1664 || !TREE_VALUE (oldargs
)
1665 || !TREE_VALUE (newargs
)
1666 || TYPE_MODE (TREE_VALUE (oldargs
))
1667 != TYPE_MODE (TREE_VALUE (newargs
)))
1670 oldargs
= TREE_CHAIN (oldargs
);
1671 newargs
= TREE_CHAIN (newargs
);
1674 trytype
= build_function_type (newrettype
, tryargs
);
1675 return build_type_attribute_variant (trytype
, TYPE_ATTRIBUTES (oldtype
));
1678 /* Subroutine of diagnose_mismatched_decls. Check for function type
1679 mismatch involving an empty arglist vs a nonempty one and give clearer
1682 diagnose_arglist_conflict (tree newdecl
, tree olddecl
,
1683 tree newtype
, tree oldtype
)
1687 if (TREE_CODE (olddecl
) != FUNCTION_DECL
1688 || !comptypes (TREE_TYPE (oldtype
), TREE_TYPE (newtype
))
1689 || !((!prototype_p (oldtype
) && DECL_INITIAL (olddecl
) == 0)
1690 || (!prototype_p (newtype
) && DECL_INITIAL (newdecl
) == 0)))
1693 t
= TYPE_ARG_TYPES (oldtype
);
1695 t
= TYPE_ARG_TYPES (newtype
);
1696 for (; t
; t
= TREE_CHAIN (t
))
1698 tree type
= TREE_VALUE (t
);
1700 if (TREE_CHAIN (t
) == 0
1701 && TYPE_MAIN_VARIANT (type
) != void_type_node
)
1703 inform (input_location
, "a parameter list with an ellipsis can%'t match "
1704 "an empty parameter name list declaration");
1708 if (c_type_promotes_to (type
) != type
)
1710 inform (input_location
, "an argument type that has a default promotion can%'t match "
1711 "an empty parameter name list declaration");
1717 /* Another subroutine of diagnose_mismatched_decls. OLDDECL is an
1718 old-style function definition, NEWDECL is a prototype declaration.
1719 Diagnose inconsistencies in the argument list. Returns TRUE if
1720 the prototype is compatible, FALSE if not. */
1722 validate_proto_after_old_defn (tree newdecl
, tree newtype
, tree oldtype
)
1724 tree newargs
, oldargs
;
1727 #define END_OF_ARGLIST(t) ((t) == void_type_node)
1729 oldargs
= TYPE_ACTUAL_ARG_TYPES (oldtype
);
1730 newargs
= TYPE_ARG_TYPES (newtype
);
1735 tree oldargtype
= TREE_VALUE (oldargs
);
1736 tree newargtype
= TREE_VALUE (newargs
);
1738 if (oldargtype
== error_mark_node
|| newargtype
== error_mark_node
)
1741 oldargtype
= (TYPE_ATOMIC (oldargtype
)
1742 ? c_build_qualified_type (TYPE_MAIN_VARIANT (oldargtype
),
1744 : TYPE_MAIN_VARIANT (oldargtype
));
1745 newargtype
= (TYPE_ATOMIC (newargtype
)
1746 ? c_build_qualified_type (TYPE_MAIN_VARIANT (newargtype
),
1748 : TYPE_MAIN_VARIANT (newargtype
));
1750 if (END_OF_ARGLIST (oldargtype
) && END_OF_ARGLIST (newargtype
))
1753 /* Reaching the end of just one list means the two decls don't
1754 agree on the number of arguments. */
1755 if (END_OF_ARGLIST (oldargtype
))
1757 error ("prototype for %q+D declares more arguments "
1758 "than previous old-style definition", newdecl
);
1761 else if (END_OF_ARGLIST (newargtype
))
1763 error ("prototype for %q+D declares fewer arguments "
1764 "than previous old-style definition", newdecl
);
1768 /* Type for passing arg must be consistent with that declared
1770 else if (!comptypes (oldargtype
, newargtype
))
1772 error ("prototype for %q+D declares argument %d"
1773 " with incompatible type",
1778 oldargs
= TREE_CHAIN (oldargs
);
1779 newargs
= TREE_CHAIN (newargs
);
1783 /* If we get here, no errors were found, but do issue a warning
1784 for this poor-style construct. */
1785 warning (0, "prototype for %q+D follows non-prototype definition",
1788 #undef END_OF_ARGLIST
1791 /* Subroutine of diagnose_mismatched_decls. Report the location of DECL,
1792 first in a pair of mismatched declarations, using the diagnostic
1795 locate_old_decl (tree decl
)
1797 if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_BUILT_IN (decl
)
1798 && !C_DECL_DECLARED_BUILTIN (decl
))
1800 else if (DECL_INITIAL (decl
))
1801 inform (input_location
, "previous definition of %q+D was here", decl
);
1802 else if (C_DECL_IMPLICIT (decl
))
1803 inform (input_location
, "previous implicit declaration of %q+D was here", decl
);
1805 inform (input_location
, "previous declaration of %q+D was here", decl
);
1808 /* Subroutine of duplicate_decls. Compare NEWDECL to OLDDECL.
1809 Returns true if the caller should proceed to merge the two, false
1810 if OLDDECL should simply be discarded. As a side effect, issues
1811 all necessary diagnostics for invalid or poor-style combinations.
1812 If it returns true, writes the types of NEWDECL and OLDDECL to
1813 *NEWTYPEP and *OLDTYPEP - these may have been adjusted from
1814 TREE_TYPE (NEWDECL, OLDDECL) respectively. */
1817 diagnose_mismatched_decls (tree newdecl
, tree olddecl
,
1818 tree
*newtypep
, tree
*oldtypep
)
1820 tree newtype
, oldtype
;
1821 bool pedwarned
= false;
1822 bool warned
= false;
1825 #define DECL_EXTERN_INLINE(DECL) (DECL_DECLARED_INLINE_P (DECL) \
1826 && DECL_EXTERNAL (DECL))
1828 /* If we have error_mark_node for either decl or type, just discard
1829 the previous decl - we're in an error cascade already. */
1830 if (olddecl
== error_mark_node
|| newdecl
== error_mark_node
)
1832 *oldtypep
= oldtype
= TREE_TYPE (olddecl
);
1833 *newtypep
= newtype
= TREE_TYPE (newdecl
);
1834 if (oldtype
== error_mark_node
|| newtype
== error_mark_node
)
1837 /* Two different categories of symbol altogether. This is an error
1838 unless OLDDECL is a builtin. OLDDECL will be discarded in any case. */
1839 if (TREE_CODE (olddecl
) != TREE_CODE (newdecl
))
1841 if (!(TREE_CODE (olddecl
) == FUNCTION_DECL
1842 && DECL_BUILT_IN (olddecl
)
1843 && !C_DECL_DECLARED_BUILTIN (olddecl
)))
1845 error ("%q+D redeclared as different kind of symbol", newdecl
);
1846 locate_old_decl (olddecl
);
1848 else if (TREE_PUBLIC (newdecl
))
1849 warning (0, "built-in function %q+D declared as non-function",
1852 warning (OPT_Wshadow
, "declaration of %q+D shadows "
1853 "a built-in function", newdecl
);
1857 /* Enumerators have no linkage, so may only be declared once in a
1859 if (TREE_CODE (olddecl
) == CONST_DECL
)
1861 error ("redeclaration of enumerator %q+D", newdecl
);
1862 locate_old_decl (olddecl
);
1866 if (!comptypes (oldtype
, newtype
))
1868 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1869 && DECL_BUILT_IN (olddecl
) && !C_DECL_DECLARED_BUILTIN (olddecl
))
1871 /* Accept harmless mismatch in function types.
1872 This is for the ffs and fprintf builtins. */
1873 tree trytype
= match_builtin_function_types (newtype
, oldtype
);
1875 if (trytype
&& comptypes (newtype
, trytype
))
1876 *oldtypep
= oldtype
= trytype
;
1879 /* If types don't match for a built-in, throw away the
1880 built-in. No point in calling locate_old_decl here, it
1881 won't print anything. */
1882 warning (0, "conflicting types for built-in function %q+D",
1887 else if (TREE_CODE (olddecl
) == FUNCTION_DECL
1888 && DECL_IS_BUILTIN (olddecl
))
1890 /* A conflicting function declaration for a predeclared
1891 function that isn't actually built in. Objective C uses
1892 these. The new declaration silently overrides everything
1893 but the volatility (i.e. noreturn) indication. See also
1894 below. FIXME: Make Objective C use normal builtins. */
1895 TREE_THIS_VOLATILE (newdecl
) |= TREE_THIS_VOLATILE (olddecl
);
1898 /* Permit void foo (...) to match int foo (...) if the latter is
1899 the definition and implicit int was used. See
1900 c-torture/compile/920625-2.c. */
1901 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
&& DECL_INITIAL (newdecl
)
1902 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype
)) == void_type_node
1903 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype
)) == integer_type_node
1904 && C_FUNCTION_IMPLICIT_INT (newdecl
) && !DECL_INITIAL (olddecl
))
1906 pedwarned
= pedwarn (input_location
, 0,
1907 "conflicting types for %q+D", newdecl
);
1908 /* Make sure we keep void as the return type. */
1909 TREE_TYPE (newdecl
) = *newtypep
= newtype
= oldtype
;
1910 C_FUNCTION_IMPLICIT_INT (newdecl
) = 0;
1912 /* Permit void foo (...) to match an earlier call to foo (...) with
1913 no declared type (thus, implicitly int). */
1914 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
1915 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype
)) == void_type_node
1916 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype
)) == integer_type_node
1917 && C_DECL_IMPLICIT (olddecl
) && !DECL_INITIAL (olddecl
))
1919 pedwarned
= pedwarn (input_location
, 0,
1920 "conflicting types for %q+D", newdecl
);
1921 /* Make sure we keep void as the return type. */
1922 TREE_TYPE (olddecl
) = *oldtypep
= oldtype
= newtype
;
1926 int new_quals
= TYPE_QUALS (newtype
);
1927 int old_quals
= TYPE_QUALS (oldtype
);
1929 if (new_quals
!= old_quals
)
1931 addr_space_t new_addr
= DECODE_QUAL_ADDR_SPACE (new_quals
);
1932 addr_space_t old_addr
= DECODE_QUAL_ADDR_SPACE (old_quals
);
1933 if (new_addr
!= old_addr
)
1935 if (ADDR_SPACE_GENERIC_P (new_addr
))
1936 error ("conflicting named address spaces (generic vs %s) "
1938 c_addr_space_name (old_addr
), newdecl
);
1939 else if (ADDR_SPACE_GENERIC_P (old_addr
))
1940 error ("conflicting named address spaces (%s vs generic) "
1942 c_addr_space_name (new_addr
), newdecl
);
1944 error ("conflicting named address spaces (%s vs %s) "
1946 c_addr_space_name (new_addr
),
1947 c_addr_space_name (old_addr
),
1951 if (CLEAR_QUAL_ADDR_SPACE (new_quals
)
1952 != CLEAR_QUAL_ADDR_SPACE (old_quals
))
1953 error ("conflicting type qualifiers for %q+D", newdecl
);
1956 error ("conflicting types for %q+D", newdecl
);
1957 diagnose_arglist_conflict (newdecl
, olddecl
, newtype
, oldtype
);
1958 locate_old_decl (olddecl
);
1963 /* Redeclaration of a type is a constraint violation (6.7.2.3p1),
1964 but silently ignore the redeclaration if either is in a system
1965 header. (Conflicting redeclarations were handled above.) This
1966 is allowed for C11 if the types are the same, not just
1968 if (TREE_CODE (newdecl
) == TYPE_DECL
)
1970 bool types_different
= false;
1971 int comptypes_result
;
1974 = comptypes_check_different_types (oldtype
, newtype
, &types_different
);
1976 if (comptypes_result
!= 1 || types_different
)
1978 error ("redefinition of typedef %q+D with different type", newdecl
);
1979 locate_old_decl (olddecl
);
1983 if (DECL_IN_SYSTEM_HEADER (newdecl
)
1984 || DECL_IN_SYSTEM_HEADER (olddecl
)
1985 || TREE_NO_WARNING (newdecl
)
1986 || TREE_NO_WARNING (olddecl
))
1987 return true; /* Allow OLDDECL to continue in use. */
1989 if (variably_modified_type_p (newtype
, NULL
))
1991 error ("redefinition of typedef %q+D with variably modified type",
1993 locate_old_decl (olddecl
);
1995 else if (pedwarn_c99 (input_location
, OPT_Wpedantic
,
1996 "redefinition of typedef %q+D", newdecl
))
1997 locate_old_decl (olddecl
);
2002 /* Function declarations can either be 'static' or 'extern' (no
2003 qualifier is equivalent to 'extern' - C99 6.2.2p5) and therefore
2004 can never conflict with each other on account of linkage
2005 (6.2.2p4). Multiple definitions are not allowed (6.9p3,5) but
2006 gnu89 mode permits two definitions if one is 'extern inline' and
2007 one is not. The non- extern-inline definition supersedes the
2008 extern-inline definition. */
2010 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2012 /* If you declare a built-in function name as static, or
2013 define the built-in with an old-style definition (so we
2014 can't validate the argument list) the built-in definition is
2015 overridden, but optionally warn this was a bad choice of name. */
2016 if (DECL_BUILT_IN (olddecl
)
2017 && !C_DECL_DECLARED_BUILTIN (olddecl
)
2018 && (!TREE_PUBLIC (newdecl
)
2019 || (DECL_INITIAL (newdecl
)
2020 && !prototype_p (TREE_TYPE (newdecl
)))))
2022 warning (OPT_Wshadow
, "declaration of %q+D shadows "
2023 "a built-in function", newdecl
);
2024 /* Discard the old built-in function. */
2028 if (DECL_INITIAL (newdecl
))
2030 if (DECL_INITIAL (olddecl
))
2032 /* If both decls are in the same TU and the new declaration
2033 isn't overriding an extern inline reject the new decl.
2034 In c99, no overriding is allowed in the same translation
2036 if ((!DECL_EXTERN_INLINE (olddecl
)
2037 || DECL_EXTERN_INLINE (newdecl
)
2038 || (!flag_gnu89_inline
2039 && (!DECL_DECLARED_INLINE_P (olddecl
)
2040 || !lookup_attribute ("gnu_inline",
2041 DECL_ATTRIBUTES (olddecl
)))
2042 && (!DECL_DECLARED_INLINE_P (newdecl
)
2043 || !lookup_attribute ("gnu_inline",
2044 DECL_ATTRIBUTES (newdecl
))))
2046 && same_translation_unit_p (newdecl
, olddecl
))
2048 error ("redefinition of %q+D", newdecl
);
2049 locate_old_decl (olddecl
);
2054 /* If we have a prototype after an old-style function definition,
2055 the argument types must be checked specially. */
2056 else if (DECL_INITIAL (olddecl
)
2057 && !prototype_p (oldtype
) && prototype_p (newtype
)
2058 && TYPE_ACTUAL_ARG_TYPES (oldtype
)
2059 && !validate_proto_after_old_defn (newdecl
, newtype
, oldtype
))
2061 locate_old_decl (olddecl
);
2064 /* A non-static declaration (even an "extern") followed by a
2065 static declaration is undefined behavior per C99 6.2.2p3-5,7.
2066 The same is true for a static forward declaration at block
2067 scope followed by a non-static declaration/definition at file
2068 scope. Static followed by non-static at the same scope is
2069 not undefined behavior, and is the most convenient way to get
2070 some effects (see e.g. what unwind-dw2-fde-glibc.c does to
2071 the definition of _Unwind_Find_FDE in unwind-dw2-fde.c), but
2072 we do diagnose it if -Wtraditional. */
2073 if (TREE_PUBLIC (olddecl
) && !TREE_PUBLIC (newdecl
))
2075 /* Two exceptions to the rule. If olddecl is an extern
2076 inline, or a predeclared function that isn't actually
2077 built in, newdecl silently overrides olddecl. The latter
2078 occur only in Objective C; see also above. (FIXME: Make
2079 Objective C use normal builtins.) */
2080 if (!DECL_IS_BUILTIN (olddecl
)
2081 && !DECL_EXTERN_INLINE (olddecl
))
2083 error ("static declaration of %q+D follows "
2084 "non-static declaration", newdecl
);
2085 locate_old_decl (olddecl
);
2089 else if (TREE_PUBLIC (newdecl
) && !TREE_PUBLIC (olddecl
))
2091 if (DECL_CONTEXT (olddecl
))
2093 error ("non-static declaration of %q+D follows "
2094 "static declaration", newdecl
);
2095 locate_old_decl (olddecl
);
2098 else if (warn_traditional
)
2100 warned
|= warning (OPT_Wtraditional
,
2101 "non-static declaration of %q+D "
2102 "follows static declaration", newdecl
);
2106 /* Make sure gnu_inline attribute is either not present, or
2107 present on all inline decls. */
2108 if (DECL_DECLARED_INLINE_P (olddecl
)
2109 && DECL_DECLARED_INLINE_P (newdecl
))
2111 bool newa
= lookup_attribute ("gnu_inline",
2112 DECL_ATTRIBUTES (newdecl
)) != NULL
;
2113 bool olda
= lookup_attribute ("gnu_inline",
2114 DECL_ATTRIBUTES (olddecl
)) != NULL
;
2117 error_at (input_location
, "%<gnu_inline%> attribute present on %q+D",
2118 newa
? newdecl
: olddecl
);
2119 error_at (DECL_SOURCE_LOCATION (newa
? olddecl
: newdecl
),
2124 else if (TREE_CODE (newdecl
) == VAR_DECL
)
2126 /* Only variables can be thread-local, and all declarations must
2127 agree on this property. */
2128 if (C_DECL_THREADPRIVATE_P (olddecl
) && !DECL_THREAD_LOCAL_P (newdecl
))
2130 /* Nothing to check. Since OLDDECL is marked threadprivate
2131 and NEWDECL does not have a thread-local attribute, we
2132 will merge the threadprivate attribute into NEWDECL. */
2135 else if (DECL_THREAD_LOCAL_P (newdecl
) != DECL_THREAD_LOCAL_P (olddecl
))
2137 if (DECL_THREAD_LOCAL_P (newdecl
))
2138 error ("thread-local declaration of %q+D follows "
2139 "non-thread-local declaration", newdecl
);
2141 error ("non-thread-local declaration of %q+D follows "
2142 "thread-local declaration", newdecl
);
2144 locate_old_decl (olddecl
);
2148 /* Multiple initialized definitions are not allowed (6.9p3,5). */
2149 if (DECL_INITIAL (newdecl
) && DECL_INITIAL (olddecl
))
2151 error ("redefinition of %q+D", newdecl
);
2152 locate_old_decl (olddecl
);
2156 /* Objects declared at file scope: if the first declaration had
2157 external linkage (even if it was an external reference) the
2158 second must have external linkage as well, or the behavior is
2159 undefined. If the first declaration had internal linkage, then
2160 the second must too, or else be an external reference (in which
2161 case the composite declaration still has internal linkage).
2162 As for function declarations, we warn about the static-then-
2163 extern case only for -Wtraditional. See generally 6.2.2p3-5,7. */
2164 if (DECL_FILE_SCOPE_P (newdecl
)
2165 && TREE_PUBLIC (newdecl
) != TREE_PUBLIC (olddecl
))
2167 if (DECL_EXTERNAL (newdecl
))
2169 if (!DECL_FILE_SCOPE_P (olddecl
))
2171 error ("extern declaration of %q+D follows "
2172 "declaration with no linkage", newdecl
);
2173 locate_old_decl (olddecl
);
2176 else if (warn_traditional
)
2178 warned
|= warning (OPT_Wtraditional
,
2179 "non-static declaration of %q+D "
2180 "follows static declaration", newdecl
);
2185 if (TREE_PUBLIC (newdecl
))
2186 error ("non-static declaration of %q+D follows "
2187 "static declaration", newdecl
);
2189 error ("static declaration of %q+D follows "
2190 "non-static declaration", newdecl
);
2192 locate_old_decl (olddecl
);
2196 /* Two objects with the same name declared at the same block
2197 scope must both be external references (6.7p3). */
2198 else if (!DECL_FILE_SCOPE_P (newdecl
))
2200 if (DECL_EXTERNAL (newdecl
))
2202 /* Extern with initializer at block scope, which will
2203 already have received an error. */
2205 else if (DECL_EXTERNAL (olddecl
))
2207 error ("declaration of %q+D with no linkage follows "
2208 "extern declaration", newdecl
);
2209 locate_old_decl (olddecl
);
2213 error ("redeclaration of %q+D with no linkage", newdecl
);
2214 locate_old_decl (olddecl
);
2220 /* C++ does not permit a decl to appear multiple times at file
2223 && DECL_FILE_SCOPE_P (newdecl
)
2224 && !DECL_EXTERNAL (newdecl
)
2225 && !DECL_EXTERNAL (olddecl
))
2226 warned
|= warning_at (DECL_SOURCE_LOCATION (newdecl
),
2228 ("duplicate declaration of %qD is "
2234 /* All decls must agree on a visibility. */
2235 if (CODE_CONTAINS_STRUCT (TREE_CODE (newdecl
), TS_DECL_WITH_VIS
)
2236 && DECL_VISIBILITY_SPECIFIED (newdecl
) && DECL_VISIBILITY_SPECIFIED (olddecl
)
2237 && DECL_VISIBILITY (newdecl
) != DECL_VISIBILITY (olddecl
))
2239 warned
|= warning (0, "redeclaration of %q+D with different visibility "
2240 "(old visibility preserved)", newdecl
);
2243 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2245 /* Diagnose inline __attribute__ ((noinline)) which is silly. */
2246 if (DECL_DECLARED_INLINE_P (newdecl
)
2247 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl
)))
2248 warned
|= warning (OPT_Wattributes
,
2249 "inline declaration of %qD follows "
2250 "declaration with attribute noinline", newdecl
);
2251 else if (DECL_DECLARED_INLINE_P (olddecl
)
2252 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl
)))
2253 warned
|= warning (OPT_Wattributes
,
2254 "declaration of %q+D with attribute "
2255 "noinline follows inline declaration ", newdecl
);
2256 else if (lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl
))
2257 && lookup_attribute ("always_inline", DECL_ATTRIBUTES (olddecl
)))
2258 warned
|= warning (OPT_Wattributes
,
2259 "declaration of %q+D with attribute "
2260 "%qs follows declaration with attribute %qs",
2261 newdecl
, "noinline", "always_inline");
2262 else if (lookup_attribute ("always_inline", DECL_ATTRIBUTES (newdecl
))
2263 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl
)))
2264 warned
|= warning (OPT_Wattributes
,
2265 "declaration of %q+D with attribute "
2266 "%qs follows declaration with attribute %qs",
2267 newdecl
, "always_inline", "noinline");
2268 else if (lookup_attribute ("cold", DECL_ATTRIBUTES (newdecl
))
2269 && lookup_attribute ("hot", DECL_ATTRIBUTES (olddecl
)))
2270 warned
|= warning (OPT_Wattributes
,
2271 "declaration of %q+D with attribute %qs follows "
2272 "declaration with attribute %qs", newdecl
, "cold",
2274 else if (lookup_attribute ("hot", DECL_ATTRIBUTES (newdecl
))
2275 && lookup_attribute ("cold", DECL_ATTRIBUTES (olddecl
)))
2276 warned
|= warning (OPT_Wattributes
,
2277 "declaration of %q+D with attribute %qs follows "
2278 "declaration with attribute %qs", newdecl
, "hot",
2281 else /* PARM_DECL, VAR_DECL */
2283 /* Redeclaration of a parameter is a constraint violation (this is
2284 not explicitly stated, but follows from C99 6.7p3 [no more than
2285 one declaration of the same identifier with no linkage in the
2286 same scope, except type tags] and 6.2.2p6 [parameters have no
2287 linkage]). We must check for a forward parameter declaration,
2288 indicated by TREE_ASM_WRITTEN on the old declaration - this is
2289 an extension, the mandatory diagnostic for which is handled by
2290 mark_forward_parm_decls. */
2292 if (TREE_CODE (newdecl
) == PARM_DECL
2293 && (!TREE_ASM_WRITTEN (olddecl
) || TREE_ASM_WRITTEN (newdecl
)))
2295 error ("redefinition of parameter %q+D", newdecl
);
2296 locate_old_decl (olddecl
);
2301 /* Optional warning for completely redundant decls. */
2302 if (!warned
&& !pedwarned
2303 && warn_redundant_decls
2304 /* Don't warn about a function declaration followed by a
2306 && !(TREE_CODE (newdecl
) == FUNCTION_DECL
2307 && DECL_INITIAL (newdecl
) && !DECL_INITIAL (olddecl
))
2308 /* Don't warn about redundant redeclarations of builtins. */
2309 && !(TREE_CODE (newdecl
) == FUNCTION_DECL
2310 && !DECL_BUILT_IN (newdecl
)
2311 && DECL_BUILT_IN (olddecl
)
2312 && !C_DECL_DECLARED_BUILTIN (olddecl
))
2313 /* Don't warn about an extern followed by a definition. */
2314 && !(DECL_EXTERNAL (olddecl
) && !DECL_EXTERNAL (newdecl
))
2315 /* Don't warn about forward parameter decls. */
2316 && !(TREE_CODE (newdecl
) == PARM_DECL
2317 && TREE_ASM_WRITTEN (olddecl
) && !TREE_ASM_WRITTEN (newdecl
))
2318 /* Don't warn about a variable definition following a declaration. */
2319 && !(TREE_CODE (newdecl
) == VAR_DECL
2320 && DECL_INITIAL (newdecl
) && !DECL_INITIAL (olddecl
)))
2322 warned
= warning (OPT_Wredundant_decls
, "redundant redeclaration of %q+D",
2326 /* Report location of previous decl/defn. */
2327 if (warned
|| pedwarned
)
2328 locate_old_decl (olddecl
);
2330 #undef DECL_EXTERN_INLINE
2335 /* Subroutine of duplicate_decls. NEWDECL has been found to be
2336 consistent with OLDDECL, but carries new information. Merge the
2337 new information into OLDDECL. This function issues no
2341 merge_decls (tree newdecl
, tree olddecl
, tree newtype
, tree oldtype
)
2343 bool new_is_definition
= (TREE_CODE (newdecl
) == FUNCTION_DECL
2344 && DECL_INITIAL (newdecl
) != 0);
2345 bool new_is_prototype
= (TREE_CODE (newdecl
) == FUNCTION_DECL
2346 && prototype_p (TREE_TYPE (newdecl
)));
2347 bool old_is_prototype
= (TREE_CODE (olddecl
) == FUNCTION_DECL
2348 && prototype_p (TREE_TYPE (olddecl
)));
2350 /* For real parm decl following a forward decl, rechain the old decl
2351 in its new location and clear TREE_ASM_WRITTEN (it's not a
2352 forward decl anymore). */
2353 if (TREE_CODE (newdecl
) == PARM_DECL
2354 && TREE_ASM_WRITTEN (olddecl
) && !TREE_ASM_WRITTEN (newdecl
))
2356 struct c_binding
*b
, **here
;
2358 for (here
= ¤t_scope
->bindings
; *here
; here
= &(*here
)->prev
)
2359 if ((*here
)->decl
== olddecl
)
2366 b
->prev
= current_scope
->bindings
;
2367 current_scope
->bindings
= b
;
2369 TREE_ASM_WRITTEN (olddecl
) = 0;
2372 DECL_ATTRIBUTES (newdecl
)
2373 = targetm
.merge_decl_attributes (olddecl
, newdecl
);
2375 /* Merge the data types specified in the two decls. */
2377 = TREE_TYPE (olddecl
)
2378 = composite_type (newtype
, oldtype
);
2380 /* Lay the type out, unless already done. */
2381 if (!comptypes (oldtype
, TREE_TYPE (newdecl
)))
2383 if (TREE_TYPE (newdecl
) != error_mark_node
)
2384 layout_type (TREE_TYPE (newdecl
));
2385 if (TREE_CODE (newdecl
) != FUNCTION_DECL
2386 && TREE_CODE (newdecl
) != TYPE_DECL
2387 && TREE_CODE (newdecl
) != CONST_DECL
)
2388 layout_decl (newdecl
, 0);
2392 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
2393 DECL_SIZE (newdecl
) = DECL_SIZE (olddecl
);
2394 DECL_SIZE_UNIT (newdecl
) = DECL_SIZE_UNIT (olddecl
);
2395 DECL_MODE (newdecl
) = DECL_MODE (olddecl
);
2396 if (DECL_ALIGN (olddecl
) > DECL_ALIGN (newdecl
))
2398 DECL_ALIGN (newdecl
) = DECL_ALIGN (olddecl
);
2399 DECL_USER_ALIGN (newdecl
) |= DECL_USER_ALIGN (olddecl
);
2403 /* Keep the old rtl since we can safely use it. */
2404 if (HAS_RTL_P (olddecl
))
2405 COPY_DECL_RTL (olddecl
, newdecl
);
2407 /* Merge the type qualifiers. */
2408 if (TREE_READONLY (newdecl
))
2409 TREE_READONLY (olddecl
) = 1;
2411 if (TREE_THIS_VOLATILE (newdecl
))
2412 TREE_THIS_VOLATILE (olddecl
) = 1;
2414 /* Merge deprecatedness. */
2415 if (TREE_DEPRECATED (newdecl
))
2416 TREE_DEPRECATED (olddecl
) = 1;
2418 /* If a decl is in a system header and the other isn't, keep the one on the
2419 system header. Otherwise, keep source location of definition rather than
2420 declaration and of prototype rather than non-prototype unless that
2421 prototype is built-in. */
2422 if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl
), TS_DECL_WITH_VIS
)
2423 && DECL_IN_SYSTEM_HEADER (olddecl
)
2424 && !DECL_IN_SYSTEM_HEADER (newdecl
) )
2425 DECL_SOURCE_LOCATION (newdecl
) = DECL_SOURCE_LOCATION (olddecl
);
2426 else if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl
), TS_DECL_WITH_VIS
)
2427 && DECL_IN_SYSTEM_HEADER (newdecl
)
2428 && !DECL_IN_SYSTEM_HEADER (olddecl
))
2429 DECL_SOURCE_LOCATION (olddecl
) = DECL_SOURCE_LOCATION (newdecl
);
2430 else if ((DECL_INITIAL (newdecl
) == 0 && DECL_INITIAL (olddecl
) != 0)
2431 || (old_is_prototype
&& !new_is_prototype
2432 && !C_DECL_BUILTIN_PROTOTYPE (olddecl
)))
2433 DECL_SOURCE_LOCATION (newdecl
) = DECL_SOURCE_LOCATION (olddecl
);
2435 /* Merge the initialization information. */
2436 if (DECL_INITIAL (newdecl
) == 0)
2437 DECL_INITIAL (newdecl
) = DECL_INITIAL (olddecl
);
2439 /* Merge the threadprivate attribute. */
2440 if (TREE_CODE (olddecl
) == VAR_DECL
&& C_DECL_THREADPRIVATE_P (olddecl
))
2441 C_DECL_THREADPRIVATE_P (newdecl
) = 1;
2443 if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl
), TS_DECL_WITH_VIS
))
2445 /* Copy the assembler name.
2446 Currently, it can only be defined in the prototype. */
2447 COPY_DECL_ASSEMBLER_NAME (olddecl
, newdecl
);
2449 /* Use visibility of whichever declaration had it specified */
2450 if (DECL_VISIBILITY_SPECIFIED (olddecl
))
2452 DECL_VISIBILITY (newdecl
) = DECL_VISIBILITY (olddecl
);
2453 DECL_VISIBILITY_SPECIFIED (newdecl
) = 1;
2456 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2458 DECL_STATIC_CONSTRUCTOR(newdecl
) |= DECL_STATIC_CONSTRUCTOR(olddecl
);
2459 DECL_STATIC_DESTRUCTOR (newdecl
) |= DECL_STATIC_DESTRUCTOR (olddecl
);
2460 DECL_NO_LIMIT_STACK (newdecl
) |= DECL_NO_LIMIT_STACK (olddecl
);
2461 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl
)
2462 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl
);
2463 TREE_THIS_VOLATILE (newdecl
) |= TREE_THIS_VOLATILE (olddecl
);
2464 DECL_IS_MALLOC (newdecl
) |= DECL_IS_MALLOC (olddecl
);
2465 DECL_IS_OPERATOR_NEW (newdecl
) |= DECL_IS_OPERATOR_NEW (olddecl
);
2466 TREE_READONLY (newdecl
) |= TREE_READONLY (olddecl
);
2467 DECL_PURE_P (newdecl
) |= DECL_PURE_P (olddecl
);
2468 DECL_IS_NOVOPS (newdecl
) |= DECL_IS_NOVOPS (olddecl
);
2471 /* Merge the storage class information. */
2472 merge_weak (newdecl
, olddecl
);
2474 /* For functions, static overrides non-static. */
2475 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2477 TREE_PUBLIC (newdecl
) &= TREE_PUBLIC (olddecl
);
2478 /* This is since we don't automatically
2479 copy the attributes of NEWDECL into OLDDECL. */
2480 TREE_PUBLIC (olddecl
) = TREE_PUBLIC (newdecl
);
2481 /* If this clears `static', clear it in the identifier too. */
2482 if (!TREE_PUBLIC (olddecl
))
2483 TREE_PUBLIC (DECL_NAME (olddecl
)) = 0;
2487 /* In c99, 'extern' declaration before (or after) 'inline' means this
2488 function is not DECL_EXTERNAL, unless 'gnu_inline' attribute
2490 if (TREE_CODE (newdecl
) == FUNCTION_DECL
2491 && !flag_gnu89_inline
2492 && (DECL_DECLARED_INLINE_P (newdecl
)
2493 || DECL_DECLARED_INLINE_P (olddecl
))
2494 && (!DECL_DECLARED_INLINE_P (newdecl
)
2495 || !DECL_DECLARED_INLINE_P (olddecl
)
2496 || !DECL_EXTERNAL (olddecl
))
2497 && DECL_EXTERNAL (newdecl
)
2498 && !lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (newdecl
))
2499 && !current_function_decl
)
2500 DECL_EXTERNAL (newdecl
) = 0;
2502 /* An inline definition following a static declaration is not
2504 if (new_is_definition
2505 && (DECL_DECLARED_INLINE_P (newdecl
)
2506 || DECL_DECLARED_INLINE_P (olddecl
))
2507 && !TREE_PUBLIC (olddecl
))
2508 DECL_EXTERNAL (newdecl
) = 0;
2510 if (DECL_EXTERNAL (newdecl
))
2512 TREE_STATIC (newdecl
) = TREE_STATIC (olddecl
);
2513 DECL_EXTERNAL (newdecl
) = DECL_EXTERNAL (olddecl
);
2515 /* An extern decl does not override previous storage class. */
2516 TREE_PUBLIC (newdecl
) = TREE_PUBLIC (olddecl
);
2517 if (!DECL_EXTERNAL (newdecl
))
2519 DECL_CONTEXT (newdecl
) = DECL_CONTEXT (olddecl
);
2520 DECL_COMMON (newdecl
) = DECL_COMMON (olddecl
);
2525 TREE_STATIC (olddecl
) = TREE_STATIC (newdecl
);
2526 TREE_PUBLIC (olddecl
) = TREE_PUBLIC (newdecl
);
2529 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2531 /* If we're redefining a function previously defined as extern
2532 inline, make sure we emit debug info for the inline before we
2533 throw it away, in case it was inlined into a function that
2534 hasn't been written out yet. */
2535 if (new_is_definition
&& DECL_INITIAL (olddecl
))
2536 /* The new defn must not be inline. */
2537 DECL_UNINLINABLE (newdecl
) = 1;
2540 /* If either decl says `inline', this fn is inline, unless
2541 its definition was passed already. */
2542 if (DECL_DECLARED_INLINE_P (newdecl
)
2543 || DECL_DECLARED_INLINE_P (olddecl
))
2544 DECL_DECLARED_INLINE_P (newdecl
) = 1;
2546 DECL_UNINLINABLE (newdecl
) = DECL_UNINLINABLE (olddecl
)
2547 = (DECL_UNINLINABLE (newdecl
) || DECL_UNINLINABLE (olddecl
));
2549 DECL_DISREGARD_INLINE_LIMITS (newdecl
)
2550 = DECL_DISREGARD_INLINE_LIMITS (olddecl
)
2551 = (DECL_DISREGARD_INLINE_LIMITS (newdecl
)
2552 || DECL_DISREGARD_INLINE_LIMITS (olddecl
));
2555 if (DECL_BUILT_IN (olddecl
))
2557 /* If redeclaring a builtin function, it stays built in.
2558 But it gets tagged as having been declared. */
2559 DECL_BUILT_IN_CLASS (newdecl
) = DECL_BUILT_IN_CLASS (olddecl
);
2560 DECL_FUNCTION_CODE (newdecl
) = DECL_FUNCTION_CODE (olddecl
);
2561 C_DECL_DECLARED_BUILTIN (newdecl
) = 1;
2562 if (new_is_prototype
)
2564 C_DECL_BUILTIN_PROTOTYPE (newdecl
) = 0;
2565 if (DECL_BUILT_IN_CLASS (newdecl
) == BUILT_IN_NORMAL
)
2567 enum built_in_function fncode
= DECL_FUNCTION_CODE (newdecl
);
2570 /* If a compatible prototype of these builtin functions
2571 is seen, assume the runtime implements it with the
2572 expected semantics. */
2573 case BUILT_IN_STPCPY
:
2574 if (builtin_decl_explicit_p (fncode
))
2575 set_builtin_decl_implicit_p (fncode
, true);
2578 if (builtin_decl_explicit_p (fncode
))
2579 set_builtin_decl_declared_p (fncode
, true);
2585 C_DECL_BUILTIN_PROTOTYPE (newdecl
)
2586 = C_DECL_BUILTIN_PROTOTYPE (olddecl
);
2589 /* Preserve function specific target and optimization options */
2590 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl
)
2591 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl
))
2592 DECL_FUNCTION_SPECIFIC_TARGET (newdecl
)
2593 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl
);
2595 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl
)
2596 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl
))
2597 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl
)
2598 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl
);
2600 /* Also preserve various other info from the definition. */
2601 if (!new_is_definition
)
2604 DECL_RESULT (newdecl
) = DECL_RESULT (olddecl
);
2605 DECL_INITIAL (newdecl
) = DECL_INITIAL (olddecl
);
2606 DECL_STRUCT_FUNCTION (newdecl
) = DECL_STRUCT_FUNCTION (olddecl
);
2607 DECL_SAVED_TREE (newdecl
) = DECL_SAVED_TREE (olddecl
);
2608 DECL_ARGUMENTS (newdecl
) = copy_list (DECL_ARGUMENTS (olddecl
));
2609 for (t
= DECL_ARGUMENTS (newdecl
); t
; t
= DECL_CHAIN (t
))
2610 DECL_CONTEXT (t
) = newdecl
;
2612 /* See if we've got a function to instantiate from. */
2613 if (DECL_SAVED_TREE (olddecl
))
2614 DECL_ABSTRACT_ORIGIN (newdecl
)
2615 = DECL_ABSTRACT_ORIGIN (olddecl
);
2619 /* Merge the USED information. */
2620 if (TREE_USED (olddecl
))
2621 TREE_USED (newdecl
) = 1;
2622 else if (TREE_USED (newdecl
))
2623 TREE_USED (olddecl
) = 1;
2624 if (TREE_CODE (olddecl
) == VAR_DECL
|| TREE_CODE (olddecl
) == PARM_DECL
)
2625 DECL_READ_P (newdecl
) |= DECL_READ_P (olddecl
);
2626 if (DECL_PRESERVE_P (olddecl
))
2627 DECL_PRESERVE_P (newdecl
) = 1;
2628 else if (DECL_PRESERVE_P (newdecl
))
2629 DECL_PRESERVE_P (olddecl
) = 1;
2631 /* Merge DECL_COMMON */
2632 if (VAR_P (olddecl
) && VAR_P (newdecl
)
2633 && !lookup_attribute ("common", DECL_ATTRIBUTES (newdecl
))
2634 && !lookup_attribute ("nocommon", DECL_ATTRIBUTES (newdecl
)))
2635 DECL_COMMON (newdecl
) = DECL_COMMON (newdecl
) && DECL_COMMON (olddecl
);
2637 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
2638 But preserve OLDDECL's DECL_UID, DECL_CONTEXT and
2639 DECL_ARGUMENTS (if appropriate). */
2641 unsigned olddecl_uid
= DECL_UID (olddecl
);
2642 tree olddecl_context
= DECL_CONTEXT (olddecl
);
2643 tree olddecl_arguments
= NULL
;
2644 if (TREE_CODE (olddecl
) == FUNCTION_DECL
)
2645 olddecl_arguments
= DECL_ARGUMENTS (olddecl
);
2647 memcpy ((char *) olddecl
+ sizeof (struct tree_common
),
2648 (char *) newdecl
+ sizeof (struct tree_common
),
2649 sizeof (struct tree_decl_common
) - sizeof (struct tree_common
));
2650 DECL_USER_ALIGN (olddecl
) = DECL_USER_ALIGN (newdecl
);
2651 switch (TREE_CODE (olddecl
))
2656 struct symtab_node
*snode
= olddecl
->decl_with_vis
.symtab_node
;
2658 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
2659 (char *) newdecl
+ sizeof (struct tree_decl_common
),
2660 tree_code_size (TREE_CODE (olddecl
)) - sizeof (struct tree_decl_common
));
2661 olddecl
->decl_with_vis
.symtab_node
= snode
;
2663 if ((DECL_EXTERNAL (olddecl
)
2664 || TREE_PUBLIC (olddecl
)
2665 || TREE_STATIC (olddecl
))
2666 && DECL_SECTION_NAME (newdecl
) != NULL
)
2667 set_decl_section_name (olddecl
, DECL_SECTION_NAME (newdecl
));
2669 /* This isn't quite correct for something like
2670 int __thread x attribute ((tls_model ("local-exec")));
2671 extern int __thread x;
2672 as we'll lose the "local-exec" model. */
2673 if (TREE_CODE (olddecl
) == VAR_DECL
2674 && DECL_THREAD_LOCAL_P (newdecl
))
2675 set_decl_tls_model (olddecl
, DECL_TLS_MODEL (newdecl
));
2685 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
2686 (char *) newdecl
+ sizeof (struct tree_decl_common
),
2687 tree_code_size (TREE_CODE (olddecl
)) - sizeof (struct tree_decl_common
));
2692 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
2693 (char *) newdecl
+ sizeof (struct tree_decl_common
),
2694 sizeof (struct tree_decl_non_common
) - sizeof (struct tree_decl_common
));
2696 DECL_UID (olddecl
) = olddecl_uid
;
2697 DECL_CONTEXT (olddecl
) = olddecl_context
;
2698 if (TREE_CODE (olddecl
) == FUNCTION_DECL
)
2699 DECL_ARGUMENTS (olddecl
) = olddecl_arguments
;
2702 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2703 so that encode_section_info has a chance to look at the new decl
2704 flags and attributes. */
2705 if (DECL_RTL_SET_P (olddecl
)
2706 && (TREE_CODE (olddecl
) == FUNCTION_DECL
2707 || (TREE_CODE (olddecl
) == VAR_DECL
2708 && TREE_STATIC (olddecl
))))
2709 make_decl_rtl (olddecl
);
2712 /* Handle when a new declaration NEWDECL has the same name as an old
2713 one OLDDECL in the same binding contour. Prints an error message
2716 If safely possible, alter OLDDECL to look like NEWDECL, and return
2717 true. Otherwise, return false. */
2720 duplicate_decls (tree newdecl
, tree olddecl
)
2722 tree newtype
= NULL
, oldtype
= NULL
;
2724 if (!diagnose_mismatched_decls (newdecl
, olddecl
, &newtype
, &oldtype
))
2726 /* Avoid `unused variable' and other warnings for OLDDECL. */
2727 TREE_NO_WARNING (olddecl
) = 1;
2731 merge_decls (newdecl
, olddecl
, newtype
, oldtype
);
2733 /* The NEWDECL will no longer be needed.
2735 Before releasing the node, be sure to remove function from symbol
2736 table that might have been inserted there to record comdat group.
2737 Be sure to however do not free DECL_STRUCT_FUNCTION because this
2738 structure is shared in between NEWDECL and OLDECL. */
2739 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2740 DECL_STRUCT_FUNCTION (newdecl
) = NULL
;
2741 if (VAR_OR_FUNCTION_DECL_P (newdecl
))
2743 struct symtab_node
*snode
= symtab_node::get (newdecl
);
2752 /* Check whether decl-node NEW_DECL shadows an existing declaration. */
2754 warn_if_shadowing (tree new_decl
)
2756 struct c_binding
*b
;
2758 /* Shadow warnings wanted? */
2760 /* No shadow warnings for internally generated vars. */
2761 || DECL_IS_BUILTIN (new_decl
)
2762 /* No shadow warnings for vars made for inlining. */
2763 || DECL_FROM_INLINE (new_decl
))
2766 /* Is anything being shadowed? Invisible decls do not count. */
2767 for (b
= I_SYMBOL_BINDING (DECL_NAME (new_decl
)); b
; b
= b
->shadowed
)
2768 if (b
->decl
&& b
->decl
!= new_decl
&& !b
->invisible
2769 && (b
->decl
== error_mark_node
2770 || diagnostic_report_warnings_p (global_dc
,
2771 DECL_SOURCE_LOCATION (b
->decl
))))
2773 tree old_decl
= b
->decl
;
2774 bool warned
= false;
2776 if (old_decl
== error_mark_node
)
2778 warning (OPT_Wshadow
, "declaration of %q+D shadows previous "
2779 "non-variable", new_decl
);
2782 else if (TREE_CODE (old_decl
) == PARM_DECL
)
2783 warned
= warning (OPT_Wshadow
,
2784 "declaration of %q+D shadows a parameter",
2786 else if (DECL_FILE_SCOPE_P (old_decl
))
2788 /* Do not warn if a variable shadows a function, unless
2789 the variable is a function or a pointer-to-function. */
2790 if (TREE_CODE (old_decl
) == FUNCTION_DECL
2791 && TREE_CODE (new_decl
) != FUNCTION_DECL
2792 && !FUNCTION_POINTER_TYPE_P (TREE_TYPE (new_decl
)))
2795 warned
= warning_at (DECL_SOURCE_LOCATION (new_decl
), OPT_Wshadow
,
2796 "declaration of %qD shadows a global "
2800 else if (TREE_CODE (old_decl
) == FUNCTION_DECL
2801 && DECL_BUILT_IN (old_decl
))
2803 warning (OPT_Wshadow
, "declaration of %q+D shadows "
2804 "a built-in function", new_decl
);
2808 warned
= warning (OPT_Wshadow
, "declaration of %q+D shadows a "
2809 "previous local", new_decl
);
2812 inform (DECL_SOURCE_LOCATION (old_decl
),
2813 "shadowed declaration is here");
2819 /* Record a decl-node X as belonging to the current lexical scope.
2820 Check for errors (such as an incompatible declaration for the same
2821 name already seen in the same scope).
2823 Returns either X or an old decl for the same name.
2824 If an old decl is returned, it may have been smashed
2825 to agree with what X says. */
2830 tree name
= DECL_NAME (x
);
2831 struct c_scope
*scope
= current_scope
;
2832 struct c_binding
*b
;
2833 bool nested
= false;
2834 location_t locus
= DECL_SOURCE_LOCATION (x
);
2836 /* Must set DECL_CONTEXT for everything not at file scope or
2837 DECL_FILE_SCOPE_P won't work. Local externs don't count
2838 unless they have initializers (which generate code). */
2839 if (current_function_decl
2840 && (!VAR_OR_FUNCTION_DECL_P (x
)
2841 || DECL_INITIAL (x
) || !DECL_EXTERNAL (x
)))
2842 DECL_CONTEXT (x
) = current_function_decl
;
2844 /* Anonymous decls are just inserted in the scope. */
2847 bind (name
, x
, scope
, /*invisible=*/false, /*nested=*/false,
2852 /* First, see if there is another declaration with the same name in
2853 the current scope. If there is, duplicate_decls may do all the
2854 work for us. If duplicate_decls returns false, that indicates
2855 two incompatible decls in the same scope; we are to silently
2856 replace the old one (duplicate_decls has issued all appropriate
2857 diagnostics). In particular, we should not consider possible
2858 duplicates in the external scope, or shadowing. */
2859 b
= I_SYMBOL_BINDING (name
);
2860 if (b
&& B_IN_SCOPE (b
, scope
))
2862 struct c_binding
*b_ext
, *b_use
;
2863 tree type
= TREE_TYPE (x
);
2864 tree visdecl
= b
->decl
;
2865 tree vistype
= TREE_TYPE (visdecl
);
2866 if (TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
2867 && COMPLETE_TYPE_P (TREE_TYPE (x
)))
2868 b
->inner_comp
= false;
2871 /* If this is an external linkage declaration, we should check
2872 for compatibility with the type in the external scope before
2873 setting the type at this scope based on the visible
2874 information only. */
2875 if (TREE_PUBLIC (x
) && TREE_PUBLIC (visdecl
))
2877 while (b_ext
&& !B_IN_EXTERNAL_SCOPE (b_ext
))
2878 b_ext
= b_ext
->shadowed
;
2883 TREE_TYPE (b_use
->decl
) = b_use
->u
.type
;
2886 if (duplicate_decls (x
, b_use
->decl
))
2890 /* Save the updated type in the external scope and
2891 restore the proper type for this scope. */
2893 if (comptypes (vistype
, type
))
2894 thistype
= composite_type (vistype
, type
);
2896 thistype
= TREE_TYPE (b_use
->decl
);
2897 b_use
->u
.type
= TREE_TYPE (b_use
->decl
);
2898 if (TREE_CODE (b_use
->decl
) == FUNCTION_DECL
2899 && DECL_BUILT_IN (b_use
->decl
))
2901 = build_type_attribute_variant (thistype
,
2904 TREE_TYPE (b_use
->decl
) = thistype
;
2909 goto skip_external_and_shadow_checks
;
2912 /* All declarations with external linkage, and all external
2913 references, go in the external scope, no matter what scope is
2914 current. However, the binding in that scope is ignored for
2915 purposes of normal name lookup. A separate binding structure is
2916 created in the requested scope; this governs the normal
2917 visibility of the symbol.
2919 The binding in the externals scope is used exclusively for
2920 detecting duplicate declarations of the same object, no matter
2921 what scope they are in; this is what we do here. (C99 6.2.7p2:
2922 All declarations that refer to the same object or function shall
2923 have compatible type; otherwise, the behavior is undefined.) */
2924 if (DECL_EXTERNAL (x
) || scope
== file_scope
)
2926 tree type
= TREE_TYPE (x
);
2929 bool type_saved
= false;
2930 if (b
&& !B_IN_EXTERNAL_SCOPE (b
)
2931 && VAR_OR_FUNCTION_DECL_P (b
->decl
)
2932 && DECL_FILE_SCOPE_P (b
->decl
))
2935 vistype
= TREE_TYPE (visdecl
);
2937 if (scope
!= file_scope
2938 && !DECL_IN_SYSTEM_HEADER (x
))
2939 warning (OPT_Wnested_externs
, "nested extern declaration of %qD", x
);
2941 while (b
&& !B_IN_EXTERNAL_SCOPE (b
))
2943 /* If this decl might be modified, save its type. This is
2944 done here rather than when the decl is first bound
2945 because the type may change after first binding, through
2946 being completed or through attributes being added. If we
2947 encounter multiple such decls, only the first should have
2948 its type saved; the others will already have had their
2949 proper types saved and the types will not have changed as
2950 their scopes will not have been re-entered. */
2951 if (DECL_P (b
->decl
) && DECL_FILE_SCOPE_P (b
->decl
) && !type_saved
)
2953 b
->u
.type
= TREE_TYPE (b
->decl
);
2956 if (B_IN_FILE_SCOPE (b
)
2957 && TREE_CODE (b
->decl
) == VAR_DECL
2958 && TREE_STATIC (b
->decl
)
2959 && TREE_CODE (TREE_TYPE (b
->decl
)) == ARRAY_TYPE
2960 && !TYPE_DOMAIN (TREE_TYPE (b
->decl
))
2961 && TREE_CODE (type
) == ARRAY_TYPE
2962 && TYPE_DOMAIN (type
)
2963 && TYPE_MAX_VALUE (TYPE_DOMAIN (type
))
2964 && !integer_zerop (TYPE_MAX_VALUE (TYPE_DOMAIN (type
))))
2966 /* Array type completed in inner scope, which should be
2967 diagnosed if the completion does not have size 1 and
2968 it does not get completed in the file scope. */
2969 b
->inner_comp
= true;
2974 /* If a matching external declaration has been found, set its
2975 type to the composite of all the types of that declaration.
2976 After the consistency checks, it will be reset to the
2977 composite of the visible types only. */
2978 if (b
&& (TREE_PUBLIC (x
) || same_translation_unit_p (x
, b
->decl
))
2980 TREE_TYPE (b
->decl
) = b
->u
.type
;
2982 /* The point of the same_translation_unit_p check here is,
2983 we want to detect a duplicate decl for a construct like
2984 foo() { extern bar(); } ... static bar(); but not if
2985 they are in different translation units. In any case,
2986 the static does not go in the externals scope. */
2988 && (TREE_PUBLIC (x
) || same_translation_unit_p (x
, b
->decl
))
2989 && duplicate_decls (x
, b
->decl
))
2994 if (comptypes (vistype
, type
))
2995 thistype
= composite_type (vistype
, type
);
2997 thistype
= TREE_TYPE (b
->decl
);
3001 b
->u
.type
= TREE_TYPE (b
->decl
);
3002 if (TREE_CODE (b
->decl
) == FUNCTION_DECL
&& DECL_BUILT_IN (b
->decl
))
3004 = build_type_attribute_variant (thistype
,
3005 TYPE_ATTRIBUTES (b
->u
.type
));
3006 TREE_TYPE (b
->decl
) = thistype
;
3007 bind (name
, b
->decl
, scope
, /*invisible=*/false, /*nested=*/true,
3011 else if (TREE_PUBLIC (x
))
3013 if (visdecl
&& !b
&& duplicate_decls (x
, visdecl
))
3015 /* An external declaration at block scope referring to a
3016 visible entity with internal linkage. The composite
3017 type will already be correct for this scope, so we
3018 just need to fall through to make the declaration in
3025 bind (name
, x
, external_scope
, /*invisible=*/true,
3026 /*nested=*/false, locus
);
3032 if (TREE_CODE (x
) != PARM_DECL
)
3033 warn_if_shadowing (x
);
3035 skip_external_and_shadow_checks
:
3036 if (TREE_CODE (x
) == TYPE_DECL
)
3038 /* So this is a typedef, set its underlying type. */
3039 set_underlying_type (x
);
3041 /* If X is a typedef defined in the current function, record it
3042 for the purpose of implementing the -Wunused-local-typedefs
3044 record_locally_defined_typedef (x
);
3047 bind (name
, x
, scope
, /*invisible=*/false, nested
, locus
);
3049 /* If x's type is incomplete because it's based on a
3050 structure or union which has not yet been fully declared,
3051 attach it to that structure or union type, so we can go
3052 back and complete the variable declaration later, if the
3053 structure or union gets fully declared.
3055 If the input is erroneous, we can have error_mark in the type
3056 slot (e.g. "f(void a, ...)") - that doesn't count as an
3058 if (TREE_TYPE (x
) != error_mark_node
3059 && !COMPLETE_TYPE_P (TREE_TYPE (x
)))
3061 tree element
= TREE_TYPE (x
);
3063 while (TREE_CODE (element
) == ARRAY_TYPE
)
3064 element
= TREE_TYPE (element
);
3065 element
= TYPE_MAIN_VARIANT (element
);
3067 if ((TREE_CODE (element
) == RECORD_TYPE
3068 || TREE_CODE (element
) == UNION_TYPE
)
3069 && (TREE_CODE (x
) != TYPE_DECL
3070 || TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
)
3071 && !COMPLETE_TYPE_P (element
))
3072 C_TYPE_INCOMPLETE_VARS (element
)
3073 = tree_cons (NULL_TREE
, x
, C_TYPE_INCOMPLETE_VARS (element
));
3078 /* Record X as belonging to file scope.
3079 This is used only internally by the Objective-C front end,
3080 and is limited to its needs. duplicate_decls is not called;
3081 if there is any preexisting decl for this identifier, it is an ICE. */
3084 pushdecl_top_level (tree x
)
3087 bool nested
= false;
3088 gcc_assert (TREE_CODE (x
) == VAR_DECL
|| TREE_CODE (x
) == CONST_DECL
);
3090 name
= DECL_NAME (x
);
3092 gcc_assert (TREE_CODE (x
) == CONST_DECL
|| !I_SYMBOL_BINDING (name
));
3094 if (TREE_PUBLIC (x
))
3096 bind (name
, x
, external_scope
, /*invisible=*/true, /*nested=*/false,
3101 bind (name
, x
, file_scope
, /*invisible=*/false, nested
, UNKNOWN_LOCATION
);
3107 implicit_decl_warning (location_t loc
, tree id
, tree olddecl
)
3109 if (warn_implicit_function_declaration
)
3114 warned
= pedwarn (loc
, OPT_Wimplicit_function_declaration
,
3115 "implicit declaration of function %qE", id
);
3117 warned
= warning_at (loc
, OPT_Wimplicit_function_declaration
,
3118 G_("implicit declaration of function %qE"), id
);
3119 if (olddecl
&& warned
)
3120 locate_old_decl (olddecl
);
3124 /* This function represents mapping of a function code FCODE
3125 to its respective header. */
3128 header_for_builtin_fn (enum built_in_function fcode
)
3132 CASE_FLT_FN (BUILT_IN_ACOS
):
3133 CASE_FLT_FN (BUILT_IN_ACOSH
):
3134 CASE_FLT_FN (BUILT_IN_ASIN
):
3135 CASE_FLT_FN (BUILT_IN_ASINH
):
3136 CASE_FLT_FN (BUILT_IN_ATAN
):
3137 CASE_FLT_FN (BUILT_IN_ATANH
):
3138 CASE_FLT_FN (BUILT_IN_ATAN2
):
3139 CASE_FLT_FN (BUILT_IN_CBRT
):
3140 CASE_FLT_FN (BUILT_IN_CEIL
):
3141 CASE_FLT_FN (BUILT_IN_COPYSIGN
):
3142 CASE_FLT_FN (BUILT_IN_COS
):
3143 CASE_FLT_FN (BUILT_IN_COSH
):
3144 CASE_FLT_FN (BUILT_IN_ERF
):
3145 CASE_FLT_FN (BUILT_IN_ERFC
):
3146 CASE_FLT_FN (BUILT_IN_EXP
):
3147 CASE_FLT_FN (BUILT_IN_EXP2
):
3148 CASE_FLT_FN (BUILT_IN_EXPM1
):
3149 CASE_FLT_FN (BUILT_IN_FABS
):
3150 CASE_FLT_FN (BUILT_IN_FDIM
):
3151 CASE_FLT_FN (BUILT_IN_FLOOR
):
3152 CASE_FLT_FN (BUILT_IN_FMA
):
3153 CASE_FLT_FN (BUILT_IN_FMAX
):
3154 CASE_FLT_FN (BUILT_IN_FMIN
):
3155 CASE_FLT_FN (BUILT_IN_FMOD
):
3156 CASE_FLT_FN (BUILT_IN_FREXP
):
3157 CASE_FLT_FN (BUILT_IN_HYPOT
):
3158 CASE_FLT_FN (BUILT_IN_ILOGB
):
3159 CASE_FLT_FN (BUILT_IN_LDEXP
):
3160 CASE_FLT_FN (BUILT_IN_LGAMMA
):
3161 CASE_FLT_FN (BUILT_IN_LLRINT
):
3162 CASE_FLT_FN (BUILT_IN_LLROUND
):
3163 CASE_FLT_FN (BUILT_IN_LOG
):
3164 CASE_FLT_FN (BUILT_IN_LOG10
):
3165 CASE_FLT_FN (BUILT_IN_LOG1P
):
3166 CASE_FLT_FN (BUILT_IN_LOG2
):
3167 CASE_FLT_FN (BUILT_IN_LOGB
):
3168 CASE_FLT_FN (BUILT_IN_LRINT
):
3169 CASE_FLT_FN (BUILT_IN_LROUND
):
3170 CASE_FLT_FN (BUILT_IN_MODF
):
3171 CASE_FLT_FN (BUILT_IN_NAN
):
3172 CASE_FLT_FN (BUILT_IN_NEARBYINT
):
3173 CASE_FLT_FN (BUILT_IN_NEXTAFTER
):
3174 CASE_FLT_FN (BUILT_IN_NEXTTOWARD
):
3175 CASE_FLT_FN (BUILT_IN_POW
):
3176 CASE_FLT_FN (BUILT_IN_REMAINDER
):
3177 CASE_FLT_FN (BUILT_IN_REMQUO
):
3178 CASE_FLT_FN (BUILT_IN_RINT
):
3179 CASE_FLT_FN (BUILT_IN_ROUND
):
3180 CASE_FLT_FN (BUILT_IN_SCALBLN
):
3181 CASE_FLT_FN (BUILT_IN_SCALBN
):
3182 CASE_FLT_FN (BUILT_IN_SIN
):
3183 CASE_FLT_FN (BUILT_IN_SINH
):
3184 CASE_FLT_FN (BUILT_IN_SINCOS
):
3185 CASE_FLT_FN (BUILT_IN_SQRT
):
3186 CASE_FLT_FN (BUILT_IN_TAN
):
3187 CASE_FLT_FN (BUILT_IN_TANH
):
3188 CASE_FLT_FN (BUILT_IN_TGAMMA
):
3189 CASE_FLT_FN (BUILT_IN_TRUNC
):
3190 case BUILT_IN_ISINF
:
3191 case BUILT_IN_ISNAN
:
3193 CASE_FLT_FN (BUILT_IN_CABS
):
3194 CASE_FLT_FN (BUILT_IN_CACOS
):
3195 CASE_FLT_FN (BUILT_IN_CACOSH
):
3196 CASE_FLT_FN (BUILT_IN_CARG
):
3197 CASE_FLT_FN (BUILT_IN_CASIN
):
3198 CASE_FLT_FN (BUILT_IN_CASINH
):
3199 CASE_FLT_FN (BUILT_IN_CATAN
):
3200 CASE_FLT_FN (BUILT_IN_CATANH
):
3201 CASE_FLT_FN (BUILT_IN_CCOS
):
3202 CASE_FLT_FN (BUILT_IN_CCOSH
):
3203 CASE_FLT_FN (BUILT_IN_CEXP
):
3204 CASE_FLT_FN (BUILT_IN_CIMAG
):
3205 CASE_FLT_FN (BUILT_IN_CLOG
):
3206 CASE_FLT_FN (BUILT_IN_CONJ
):
3207 CASE_FLT_FN (BUILT_IN_CPOW
):
3208 CASE_FLT_FN (BUILT_IN_CPROJ
):
3209 CASE_FLT_FN (BUILT_IN_CREAL
):
3210 CASE_FLT_FN (BUILT_IN_CSIN
):
3211 CASE_FLT_FN (BUILT_IN_CSINH
):
3212 CASE_FLT_FN (BUILT_IN_CSQRT
):
3213 CASE_FLT_FN (BUILT_IN_CTAN
):
3214 CASE_FLT_FN (BUILT_IN_CTANH
):
3215 return "<complex.h>";
3216 case BUILT_IN_MEMCHR
:
3217 case BUILT_IN_MEMCMP
:
3218 case BUILT_IN_MEMCPY
:
3219 case BUILT_IN_MEMMOVE
:
3220 case BUILT_IN_MEMSET
:
3221 case BUILT_IN_STRCAT
:
3222 case BUILT_IN_STRCHR
:
3223 case BUILT_IN_STRCMP
:
3224 case BUILT_IN_STRCPY
:
3225 case BUILT_IN_STRCSPN
:
3226 case BUILT_IN_STRLEN
:
3227 case BUILT_IN_STRNCAT
:
3228 case BUILT_IN_STRNCMP
:
3229 case BUILT_IN_STRNCPY
:
3230 case BUILT_IN_STRPBRK
:
3231 case BUILT_IN_STRRCHR
:
3232 case BUILT_IN_STRSPN
:
3233 case BUILT_IN_STRSTR
:
3234 return "<string.h>";
3235 case BUILT_IN_FPRINTF
:
3237 case BUILT_IN_FPUTC
:
3238 case BUILT_IN_FPUTS
:
3239 case BUILT_IN_FSCANF
:
3240 case BUILT_IN_FWRITE
:
3241 case BUILT_IN_PRINTF
:
3242 case BUILT_IN_PUTCHAR
:
3244 case BUILT_IN_SCANF
:
3245 case BUILT_IN_SNPRINTF
:
3246 case BUILT_IN_SPRINTF
:
3247 case BUILT_IN_SSCANF
:
3248 case BUILT_IN_VFPRINTF
:
3249 case BUILT_IN_VFSCANF
:
3250 case BUILT_IN_VPRINTF
:
3251 case BUILT_IN_VSCANF
:
3252 case BUILT_IN_VSNPRINTF
:
3253 case BUILT_IN_VSPRINTF
:
3254 case BUILT_IN_VSSCANF
:
3256 case BUILT_IN_ISALNUM
:
3257 case BUILT_IN_ISALPHA
:
3258 case BUILT_IN_ISBLANK
:
3259 case BUILT_IN_ISCNTRL
:
3260 case BUILT_IN_ISDIGIT
:
3261 case BUILT_IN_ISGRAPH
:
3262 case BUILT_IN_ISLOWER
:
3263 case BUILT_IN_ISPRINT
:
3264 case BUILT_IN_ISPUNCT
:
3265 case BUILT_IN_ISSPACE
:
3266 case BUILT_IN_ISUPPER
:
3267 case BUILT_IN_ISXDIGIT
:
3268 case BUILT_IN_TOLOWER
:
3269 case BUILT_IN_TOUPPER
:
3271 case BUILT_IN_ISWALNUM
:
3272 case BUILT_IN_ISWALPHA
:
3273 case BUILT_IN_ISWBLANK
:
3274 case BUILT_IN_ISWCNTRL
:
3275 case BUILT_IN_ISWDIGIT
:
3276 case BUILT_IN_ISWGRAPH
:
3277 case BUILT_IN_ISWLOWER
:
3278 case BUILT_IN_ISWPRINT
:
3279 case BUILT_IN_ISWPUNCT
:
3280 case BUILT_IN_ISWSPACE
:
3281 case BUILT_IN_ISWUPPER
:
3282 case BUILT_IN_ISWXDIGIT
:
3283 case BUILT_IN_TOWLOWER
:
3284 case BUILT_IN_TOWUPPER
:
3285 return "<wctype.h>";
3286 case BUILT_IN_ABORT
:
3288 case BUILT_IN_CALLOC
:
3292 case BUILT_IN_LLABS
:
3293 case BUILT_IN_MALLOC
:
3294 case BUILT_IN_REALLOC
:
3295 case BUILT_IN__EXIT2
:
3296 case BUILT_IN_ALIGNED_ALLOC
:
3297 return "<stdlib.h>";
3298 case BUILT_IN_IMAXABS
:
3299 return "<inttypes.h>";
3300 case BUILT_IN_STRFTIME
:
3307 /* Generate an implicit declaration for identifier FUNCTIONID at LOC as a
3308 function of type int (). */
3311 implicitly_declare (location_t loc
, tree functionid
)
3313 struct c_binding
*b
;
3317 for (b
= I_SYMBOL_BINDING (functionid
); b
; b
= b
->shadowed
)
3319 if (B_IN_SCOPE (b
, external_scope
))
3328 if (decl
== error_mark_node
)
3331 /* FIXME: Objective-C has weird not-really-builtin functions
3332 which are supposed to be visible automatically. They wind up
3333 in the external scope because they're pushed before the file
3334 scope gets created. Catch this here and rebind them into the
3336 if (!DECL_BUILT_IN (decl
) && DECL_IS_BUILTIN (decl
))
3338 bind (functionid
, decl
, file_scope
,
3339 /*invisible=*/false, /*nested=*/true,
3340 DECL_SOURCE_LOCATION (decl
));
3345 tree newtype
= default_function_type
;
3347 TREE_TYPE (decl
) = b
->u
.type
;
3348 /* Implicit declaration of a function already declared
3349 (somehow) in a different scope, or as a built-in.
3350 If this is the first time this has happened, warn;
3351 then recycle the old declaration but with the new type. */
3352 if (!C_DECL_IMPLICIT (decl
))
3354 implicit_decl_warning (loc
, functionid
, decl
);
3355 C_DECL_IMPLICIT (decl
) = 1;
3357 if (DECL_BUILT_IN (decl
))
3359 newtype
= build_type_attribute_variant (newtype
,
3361 (TREE_TYPE (decl
)));
3362 if (!comptypes (newtype
, TREE_TYPE (decl
)))
3364 bool warned
= warning_at (loc
, 0, "incompatible implicit "
3365 "declaration of built-in "
3366 "function %qD", decl
);
3367 /* See if we can hint which header to include. */
3369 = header_for_builtin_fn (DECL_FUNCTION_CODE (decl
));
3370 if (header
!= NULL
&& warned
)
3371 inform (loc
, "include %qs or provide a declaration of %qD",
3373 newtype
= TREE_TYPE (decl
);
3378 if (!comptypes (newtype
, TREE_TYPE (decl
)))
3380 error_at (loc
, "incompatible implicit declaration of "
3381 "function %qD", decl
);
3382 locate_old_decl (decl
);
3385 b
->u
.type
= TREE_TYPE (decl
);
3386 TREE_TYPE (decl
) = newtype
;
3387 bind (functionid
, decl
, current_scope
,
3388 /*invisible=*/false, /*nested=*/true,
3389 DECL_SOURCE_LOCATION (decl
));
3394 /* Not seen before. */
3395 decl
= build_decl (loc
, FUNCTION_DECL
, functionid
, default_function_type
);
3396 DECL_EXTERNAL (decl
) = 1;
3397 TREE_PUBLIC (decl
) = 1;
3398 C_DECL_IMPLICIT (decl
) = 1;
3399 implicit_decl_warning (loc
, functionid
, 0);
3400 asmspec_tree
= maybe_apply_renaming_pragma (decl
, /*asmname=*/NULL
);
3402 set_user_assembler_name (decl
, TREE_STRING_POINTER (asmspec_tree
));
3404 /* C89 says implicit declarations are in the innermost block.
3405 So we record the decl in the standard fashion. */
3406 decl
= pushdecl (decl
);
3408 /* No need to call objc_check_decl here - it's a function type. */
3409 rest_of_decl_compilation (decl
, 0, 0);
3411 /* Write a record describing this implicit function declaration
3412 to the prototypes file (if requested). */
3413 gen_aux_info_record (decl
, 0, 1, 0);
3415 /* Possibly apply some default attributes to this implicit declaration. */
3416 decl_attributes (&decl
, NULL_TREE
, 0);
3421 /* Issue an error message for a reference to an undeclared variable
3422 ID, including a reference to a builtin outside of function-call
3423 context. Establish a binding of the identifier to error_mark_node
3424 in an appropriate scope, which will suppress further errors for the
3425 same identifier. The error message should be given location LOC. */
3427 undeclared_variable (location_t loc
, tree id
)
3429 static bool already
= false;
3430 struct c_scope
*scope
;
3432 if (current_function_decl
== 0)
3434 error_at (loc
, "%qE undeclared here (not in a function)", id
);
3435 scope
= current_scope
;
3439 if (!objc_diagnose_private_ivar (id
))
3440 error_at (loc
, "%qE undeclared (first use in this function)", id
);
3443 inform (loc
, "each undeclared identifier is reported only"
3444 " once for each function it appears in");
3448 /* If we are parsing old-style parameter decls, current_function_decl
3449 will be nonnull but current_function_scope will be null. */
3450 scope
= current_function_scope
? current_function_scope
: current_scope
;
3452 bind (id
, error_mark_node
, scope
, /*invisible=*/false, /*nested=*/false,
3456 /* Subroutine of lookup_label, declare_label, define_label: construct a
3457 LABEL_DECL with all the proper frills. Also create a struct
3458 c_label_vars initialized for the current scope. */
3461 make_label (location_t location
, tree name
, bool defining
,
3462 struct c_label_vars
**p_label_vars
)
3464 tree label
= build_decl (location
, LABEL_DECL
, name
, void_type_node
);
3465 DECL_CONTEXT (label
) = current_function_decl
;
3466 DECL_MODE (label
) = VOIDmode
;
3468 c_label_vars
*label_vars
= ggc_alloc
<c_label_vars
> ();
3469 label_vars
->shadowed
= NULL
;
3470 set_spot_bindings (&label_vars
->label_bindings
, defining
);
3471 label_vars
->decls_in_scope
= make_tree_vector ();
3472 label_vars
->gotos
= NULL
;
3473 *p_label_vars
= label_vars
;
3478 /* Get the LABEL_DECL corresponding to identifier NAME as a label.
3479 Create one if none exists so far for the current function.
3480 This is called when a label is used in a goto expression or
3481 has its address taken. */
3484 lookup_label (tree name
)
3487 struct c_label_vars
*label_vars
;
3489 if (current_function_scope
== 0)
3491 error ("label %qE referenced outside of any function", name
);
3495 /* Use a label already defined or ref'd with this name, but not if
3496 it is inherited from a containing function and wasn't declared
3498 label
= I_LABEL_DECL (name
);
3499 if (label
&& (DECL_CONTEXT (label
) == current_function_decl
3500 || C_DECLARED_LABEL_FLAG (label
)))
3502 /* If the label has only been declared, update its apparent
3503 location to point here, for better diagnostics if it
3504 turns out not to have been defined. */
3505 if (DECL_INITIAL (label
) == NULL_TREE
)
3506 DECL_SOURCE_LOCATION (label
) = input_location
;
3510 /* No label binding for that identifier; make one. */
3511 label
= make_label (input_location
, name
, false, &label_vars
);
3513 /* Ordinary labels go in the current function scope. */
3514 bind_label (name
, label
, current_function_scope
, label_vars
);
3519 /* Issue a warning about DECL for a goto statement at GOTO_LOC going
3523 warn_about_goto (location_t goto_loc
, tree label
, tree decl
)
3525 if (variably_modified_type_p (TREE_TYPE (decl
), NULL_TREE
))
3527 "jump into scope of identifier with variably modified type");
3529 warning_at (goto_loc
, OPT_Wjump_misses_init
,
3530 "jump skips variable initialization");
3531 inform (DECL_SOURCE_LOCATION (label
), "label %qD defined here", label
);
3532 inform (DECL_SOURCE_LOCATION (decl
), "%qD declared here", decl
);
3535 /* Look up a label because of a goto statement. This is like
3536 lookup_label, but also issues any appropriate warnings. */
3539 lookup_label_for_goto (location_t loc
, tree name
)
3542 struct c_label_vars
*label_vars
;
3546 label
= lookup_label (name
);
3547 if (label
== NULL_TREE
)
3550 /* If we are jumping to a different function, we can't issue any
3552 if (DECL_CONTEXT (label
) != current_function_decl
)
3554 gcc_assert (C_DECLARED_LABEL_FLAG (label
));
3558 label_vars
= I_LABEL_BINDING (name
)->u
.label
;
3560 /* If the label has not yet been defined, then push this goto on a
3561 list for possible later warnings. */
3562 if (label_vars
->label_bindings
.scope
== NULL
)
3564 c_goto_bindings
*g
= ggc_alloc
<c_goto_bindings
> ();
3567 set_spot_bindings (&g
->goto_bindings
, true);
3568 vec_safe_push (label_vars
->gotos
, g
);
3572 /* If there are any decls in label_vars->decls_in_scope, then this
3573 goto has missed the declaration of the decl. This happens for a
3579 Issue a warning or error. */
3580 FOR_EACH_VEC_SAFE_ELT (label_vars
->decls_in_scope
, ix
, decl
)
3581 warn_about_goto (loc
, label
, decl
);
3583 if (label_vars
->label_bindings
.left_stmt_expr
)
3585 error_at (loc
, "jump into statement expression");
3586 inform (DECL_SOURCE_LOCATION (label
), "label %qD defined here", label
);
3592 /* Make a label named NAME in the current function, shadowing silently
3593 any that may be inherited from containing functions or containing
3594 scopes. This is called for __label__ declarations. */
3597 declare_label (tree name
)
3599 struct c_binding
*b
= I_LABEL_BINDING (name
);
3601 struct c_label_vars
*label_vars
;
3603 /* Check to make sure that the label hasn't already been declared
3605 if (b
&& B_IN_CURRENT_SCOPE (b
))
3607 error ("duplicate label declaration %qE", name
);
3608 locate_old_decl (b
->decl
);
3610 /* Just use the previous declaration. */
3614 label
= make_label (input_location
, name
, false, &label_vars
);
3615 C_DECLARED_LABEL_FLAG (label
) = 1;
3617 /* Declared labels go in the current scope. */
3618 bind_label (name
, label
, current_scope
, label_vars
);
3623 /* When we define a label, issue any appropriate warnings if there are
3624 any gotos earlier in the function which jump to this label. */
3627 check_earlier_gotos (tree label
, struct c_label_vars
* label_vars
)
3630 struct c_goto_bindings
*g
;
3632 FOR_EACH_VEC_SAFE_ELT (label_vars
->gotos
, ix
, g
)
3634 struct c_binding
*b
;
3635 struct c_scope
*scope
;
3637 /* We have a goto to this label. The goto is going forward. In
3638 g->scope, the goto is going to skip any binding which was
3639 defined after g->bindings_in_scope. */
3640 if (g
->goto_bindings
.scope
->has_jump_unsafe_decl
)
3642 for (b
= g
->goto_bindings
.scope
->bindings
;
3643 b
!= g
->goto_bindings
.bindings_in_scope
;
3646 if (decl_jump_unsafe (b
->decl
))
3647 warn_about_goto (g
->loc
, label
, b
->decl
);
3651 /* We also need to warn about decls defined in any scopes
3652 between the scope of the label and the scope of the goto. */
3653 for (scope
= label_vars
->label_bindings
.scope
;
3654 scope
!= g
->goto_bindings
.scope
;
3655 scope
= scope
->outer
)
3657 gcc_assert (scope
!= NULL
);
3658 if (scope
->has_jump_unsafe_decl
)
3660 if (scope
== label_vars
->label_bindings
.scope
)
3661 b
= label_vars
->label_bindings
.bindings_in_scope
;
3663 b
= scope
->bindings
;
3664 for (; b
!= NULL
; b
= b
->prev
)
3666 if (decl_jump_unsafe (b
->decl
))
3667 warn_about_goto (g
->loc
, label
, b
->decl
);
3672 if (g
->goto_bindings
.stmt_exprs
> 0)
3674 error_at (g
->loc
, "jump into statement expression");
3675 inform (DECL_SOURCE_LOCATION (label
), "label %qD defined here",
3680 /* Now that the label is defined, we will issue warnings about
3681 subsequent gotos to this label when we see them. */
3682 vec_safe_truncate (label_vars
->gotos
, 0);
3683 label_vars
->gotos
= NULL
;
3686 /* Define a label, specifying the location in the source file.
3687 Return the LABEL_DECL node for the label, if the definition is valid.
3688 Otherwise return 0. */
3691 define_label (location_t location
, tree name
)
3693 /* Find any preexisting label with this name. It is an error
3694 if that label has already been defined in this function, or
3695 if there is a containing function with a declared label with
3697 tree label
= I_LABEL_DECL (name
);
3700 && ((DECL_CONTEXT (label
) == current_function_decl
3701 && DECL_INITIAL (label
) != 0)
3702 || (DECL_CONTEXT (label
) != current_function_decl
3703 && C_DECLARED_LABEL_FLAG (label
))))
3705 error_at (location
, "duplicate label %qD", label
);
3706 locate_old_decl (label
);
3709 else if (label
&& DECL_CONTEXT (label
) == current_function_decl
)
3711 struct c_label_vars
*label_vars
= I_LABEL_BINDING (name
)->u
.label
;
3713 /* The label has been used or declared already in this function,
3714 but not defined. Update its location to point to this
3716 DECL_SOURCE_LOCATION (label
) = location
;
3717 set_spot_bindings (&label_vars
->label_bindings
, true);
3719 /* Issue warnings as required about any goto statements from
3720 earlier in the function. */
3721 check_earlier_gotos (label
, label_vars
);
3725 struct c_label_vars
*label_vars
;
3727 /* No label binding for that identifier; make one. */
3728 label
= make_label (location
, name
, true, &label_vars
);
3730 /* Ordinary labels go in the current function scope. */
3731 bind_label (name
, label
, current_function_scope
, label_vars
);
3734 if (!in_system_header_at (input_location
) && lookup_name (name
))
3735 warning_at (location
, OPT_Wtraditional
,
3736 "traditional C lacks a separate namespace "
3737 "for labels, identifier %qE conflicts", name
);
3739 /* Mark label as having been defined. */
3740 DECL_INITIAL (label
) = error_mark_node
;
3744 /* Get the bindings for a new switch statement. This is used to issue
3745 warnings as appropriate for jumps from the switch to case or
3748 struct c_spot_bindings
*
3749 c_get_switch_bindings (void)
3751 struct c_spot_bindings
*switch_bindings
;
3753 switch_bindings
= XNEW (struct c_spot_bindings
);
3754 set_spot_bindings (switch_bindings
, true);
3755 return switch_bindings
;
3759 c_release_switch_bindings (struct c_spot_bindings
*bindings
)
3761 gcc_assert (bindings
->stmt_exprs
== 0 && !bindings
->left_stmt_expr
);
3765 /* This is called at the point of a case or default label to issue
3766 warnings about decls as needed. It returns true if it found an
3767 error, not just a warning. */
3770 c_check_switch_jump_warnings (struct c_spot_bindings
*switch_bindings
,
3771 location_t switch_loc
, location_t case_loc
)
3774 struct c_scope
*scope
;
3777 for (scope
= current_scope
;
3778 scope
!= switch_bindings
->scope
;
3779 scope
= scope
->outer
)
3781 struct c_binding
*b
;
3783 gcc_assert (scope
!= NULL
);
3785 if (!scope
->has_jump_unsafe_decl
)
3788 for (b
= scope
->bindings
; b
!= NULL
; b
= b
->prev
)
3790 if (decl_jump_unsafe (b
->decl
))
3792 if (variably_modified_type_p (TREE_TYPE (b
->decl
), NULL_TREE
))
3796 ("switch jumps into scope of identifier with "
3797 "variably modified type"));
3800 warning_at (case_loc
, OPT_Wjump_misses_init
,
3801 "switch jumps over variable initialization");
3802 inform (switch_loc
, "switch starts here");
3803 inform (DECL_SOURCE_LOCATION (b
->decl
), "%qD declared here",
3809 if (switch_bindings
->stmt_exprs
> 0)
3812 error_at (case_loc
, "switch jumps into statement expression");
3813 inform (switch_loc
, "switch starts here");
3819 /* Given NAME, an IDENTIFIER_NODE,
3820 return the structure (or union or enum) definition for that name.
3821 If THISLEVEL_ONLY is nonzero, searches only the current_scope.
3822 CODE says which kind of type the caller wants;
3823 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
3824 If PLOC is not NULL and this returns non-null, it sets *PLOC to the
3825 location where the tag was defined.
3826 If the wrong kind of type is found, an error is reported. */
3829 lookup_tag (enum tree_code code
, tree name
, int thislevel_only
,
3832 struct c_binding
*b
= I_TAG_BINDING (name
);
3838 /* We only care about whether it's in this level if
3839 thislevel_only was set or it might be a type clash. */
3840 if (thislevel_only
|| TREE_CODE (b
->decl
) != code
)
3842 /* For our purposes, a tag in the external scope is the same as
3843 a tag in the file scope. (Primarily relevant to Objective-C
3844 and its builtin structure tags, which get pushed before the
3845 file scope is created.) */
3846 if (B_IN_CURRENT_SCOPE (b
)
3847 || (current_scope
== file_scope
&& B_IN_EXTERNAL_SCOPE (b
)))
3851 if (thislevel_only
&& !thislevel
)
3854 if (TREE_CODE (b
->decl
) != code
)
3856 /* Definition isn't the kind we were looking for. */
3857 pending_invalid_xref
= name
;
3858 pending_invalid_xref_location
= input_location
;
3860 /* If in the same binding level as a declaration as a tag
3861 of a different type, this must not be allowed to
3862 shadow that tag, so give the error immediately.
3863 (For example, "struct foo; union foo;" is invalid.) */
3865 pending_xref_error ();
3874 /* Print an error message now
3875 for a recent invalid struct, union or enum cross reference.
3876 We don't print them immediately because they are not invalid
3877 when used in the `struct foo;' construct for shadowing. */
3880 pending_xref_error (void)
3882 if (pending_invalid_xref
!= 0)
3883 error_at (pending_invalid_xref_location
, "%qE defined as wrong kind of tag",
3884 pending_invalid_xref
);
3885 pending_invalid_xref
= 0;
3889 /* Look up NAME in the current scope and its superiors
3890 in the namespace of variables, functions and typedefs.
3891 Return a ..._DECL node of some kind representing its definition,
3892 or return 0 if it is undefined. */
3895 lookup_name (tree name
)
3897 struct c_binding
*b
= I_SYMBOL_BINDING (name
);
3898 if (b
&& !b
->invisible
)
3900 maybe_record_typedef_use (b
->decl
);
3906 /* Similar to `lookup_name' but look only at the indicated scope. */
3909 lookup_name_in_scope (tree name
, struct c_scope
*scope
)
3911 struct c_binding
*b
;
3913 for (b
= I_SYMBOL_BINDING (name
); b
; b
= b
->shadowed
)
3914 if (B_IN_SCOPE (b
, scope
))
3919 /* Create the predefined scalar types of C,
3920 and some nodes representing standard constants (0, 1, (void *) 0).
3921 Initialize the global scope.
3922 Make definitions for built-in primitive functions. */
3925 c_init_decl_processing (void)
3927 location_t save_loc
= input_location
;
3929 /* Initialize reserved words for parser. */
3932 current_function_decl
= 0;
3934 gcc_obstack_init (&parser_obstack
);
3936 /* Make the externals scope. */
3938 external_scope
= current_scope
;
3940 /* Declarations from c_common_nodes_and_builtins must not be associated
3941 with this input file, lest we get differences between using and not
3942 using preprocessed headers. */
3943 input_location
= BUILTINS_LOCATION
;
3945 c_common_nodes_and_builtins ();
3947 /* In C, comparisons and TRUTH_* expressions have type int. */
3948 truthvalue_type_node
= integer_type_node
;
3949 truthvalue_true_node
= integer_one_node
;
3950 truthvalue_false_node
= integer_zero_node
;
3952 /* Even in C99, which has a real boolean type. */
3953 pushdecl (build_decl (UNKNOWN_LOCATION
, TYPE_DECL
, get_identifier ("_Bool"),
3954 boolean_type_node
));
3956 input_location
= save_loc
;
3958 make_fname_decl
= c_make_fname_decl
;
3959 start_fname_decls ();
3962 /* Create the VAR_DECL at LOC for __FUNCTION__ etc. ID is the name to
3963 give the decl, NAME is the initialization string and TYPE_DEP
3964 indicates whether NAME depended on the type of the function. As we
3965 don't yet implement delayed emission of static data, we mark the
3966 decl as emitted so it is not placed in the output. Anything using
3967 it must therefore pull out the STRING_CST initializer directly.
3971 c_make_fname_decl (location_t loc
, tree id
, int type_dep
)
3973 const char *name
= fname_as_string (type_dep
);
3974 tree decl
, type
, init
;
3975 size_t length
= strlen (name
);
3977 type
= build_array_type (char_type_node
,
3978 build_index_type (size_int (length
)));
3979 type
= c_build_qualified_type (type
, TYPE_QUAL_CONST
);
3981 decl
= build_decl (loc
, VAR_DECL
, id
, type
);
3983 TREE_STATIC (decl
) = 1;
3984 TREE_READONLY (decl
) = 1;
3985 DECL_ARTIFICIAL (decl
) = 1;
3987 init
= build_string (length
+ 1, name
);
3988 free (CONST_CAST (char *, name
));
3989 TREE_TYPE (init
) = type
;
3990 DECL_INITIAL (decl
) = init
;
3992 TREE_USED (decl
) = 1;
3994 if (current_function_decl
3995 /* For invalid programs like this:
3998 const char* p = __FUNCTION__;
4000 the __FUNCTION__ is believed to appear in K&R style function
4001 parameter declarator. In that case we still don't have
4003 && (!seen_error () || current_function_scope
))
4005 DECL_CONTEXT (decl
) = current_function_decl
;
4006 bind (id
, decl
, current_function_scope
,
4007 /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION
);
4010 finish_decl (decl
, loc
, init
, NULL_TREE
, NULL_TREE
);
4016 c_builtin_function (tree decl
)
4018 tree type
= TREE_TYPE (decl
);
4019 tree id
= DECL_NAME (decl
);
4021 const char *name
= IDENTIFIER_POINTER (id
);
4022 C_DECL_BUILTIN_PROTOTYPE (decl
) = prototype_p (type
);
4024 /* Should never be called on a symbol with a preexisting meaning. */
4025 gcc_assert (!I_SYMBOL_BINDING (id
));
4027 bind (id
, decl
, external_scope
, /*invisible=*/true, /*nested=*/false,
4030 /* Builtins in the implementation namespace are made visible without
4031 needing to be explicitly declared. See push_file_scope. */
4032 if (name
[0] == '_' && (name
[1] == '_' || ISUPPER (name
[1])))
4034 DECL_CHAIN (decl
) = visible_builtins
;
4035 visible_builtins
= decl
;
4042 c_builtin_function_ext_scope (tree decl
)
4044 tree type
= TREE_TYPE (decl
);
4045 tree id
= DECL_NAME (decl
);
4047 const char *name
= IDENTIFIER_POINTER (id
);
4048 C_DECL_BUILTIN_PROTOTYPE (decl
) = prototype_p (type
);
4051 bind (id
, decl
, external_scope
, /*invisible=*/false, /*nested=*/false,
4054 /* Builtins in the implementation namespace are made visible without
4055 needing to be explicitly declared. See push_file_scope. */
4056 if (name
[0] == '_' && (name
[1] == '_' || ISUPPER (name
[1])))
4058 DECL_CHAIN (decl
) = visible_builtins
;
4059 visible_builtins
= decl
;
4065 /* Called when a declaration is seen that contains no names to declare.
4066 If its type is a reference to a structure, union or enum inherited
4067 from a containing scope, shadow that tag name for the current scope
4068 with a forward reference.
4069 If its type defines a new named structure or union
4070 or defines an enum, it is valid but we need not do anything here.
4071 Otherwise, it is an error. */
4074 shadow_tag (const struct c_declspecs
*declspecs
)
4076 shadow_tag_warned (declspecs
, 0);
4079 /* WARNED is 1 if we have done a pedwarn, 2 if we have done a warning,
4082 shadow_tag_warned (const struct c_declspecs
*declspecs
, int warned
)
4084 bool found_tag
= false;
4086 if (declspecs
->type
&& !declspecs
->default_int_p
&& !declspecs
->typedef_p
)
4088 tree value
= declspecs
->type
;
4089 enum tree_code code
= TREE_CODE (value
);
4091 if (code
== RECORD_TYPE
|| code
== UNION_TYPE
|| code
== ENUMERAL_TYPE
)
4092 /* Used to test also that TYPE_SIZE (value) != 0.
4093 That caused warning for `struct foo;' at top level in the file. */
4095 tree name
= TYPE_NAME (value
);
4100 if (declspecs
->restrict_p
)
4102 error ("invalid use of %<restrict%>");
4108 if (warned
!= 1 && code
!= ENUMERAL_TYPE
)
4109 /* Empty unnamed enum OK */
4111 pedwarn (input_location
, 0,
4112 "unnamed struct/union that defines no instances");
4116 else if (declspecs
->typespec_kind
!= ctsk_tagdef
4117 && declspecs
->typespec_kind
!= ctsk_tagfirstref
4118 && declspecs
->storage_class
!= csc_none
)
4121 pedwarn (input_location
, 0,
4122 "empty declaration with storage class specifier "
4123 "does not redeclare tag");
4125 pending_xref_error ();
4127 else if (declspecs
->typespec_kind
!= ctsk_tagdef
4128 && declspecs
->typespec_kind
!= ctsk_tagfirstref
4129 && (declspecs
->const_p
4130 || declspecs
->volatile_p
4131 || declspecs
->atomic_p
4132 || declspecs
->restrict_p
4133 || declspecs
->address_space
))
4136 pedwarn (input_location
, 0,
4137 "empty declaration with type qualifier "
4138 "does not redeclare tag");
4140 pending_xref_error ();
4142 else if (declspecs
->typespec_kind
!= ctsk_tagdef
4143 && declspecs
->typespec_kind
!= ctsk_tagfirstref
4144 && declspecs
->alignas_p
)
4147 pedwarn (input_location
, 0,
4148 "empty declaration with %<_Alignas%> "
4149 "does not redeclare tag");
4151 pending_xref_error ();
4155 pending_invalid_xref
= 0;
4156 t
= lookup_tag (code
, name
, 1, NULL
);
4160 t
= make_node (code
);
4161 pushtag (input_location
, name
, t
);
4167 if (warned
!= 1 && !in_system_header_at (input_location
))
4169 pedwarn (input_location
, 0,
4170 "useless type name in empty declaration");
4175 else if (warned
!= 1 && !in_system_header_at (input_location
)
4176 && declspecs
->typedef_p
)
4178 pedwarn (input_location
, 0, "useless type name in empty declaration");
4182 pending_invalid_xref
= 0;
4184 if (declspecs
->inline_p
)
4186 error ("%<inline%> in empty declaration");
4190 if (declspecs
->noreturn_p
)
4192 error ("%<_Noreturn%> in empty declaration");
4196 if (current_scope
== file_scope
&& declspecs
->storage_class
== csc_auto
)
4198 error ("%<auto%> in file-scope empty declaration");
4202 if (current_scope
== file_scope
&& declspecs
->storage_class
== csc_register
)
4204 error ("%<register%> in file-scope empty declaration");
4208 if (!warned
&& !in_system_header_at (input_location
)
4209 && declspecs
->storage_class
!= csc_none
)
4211 warning (0, "useless storage class specifier in empty declaration");
4215 if (!warned
&& !in_system_header_at (input_location
) && declspecs
->thread_p
)
4217 warning (0, "useless %qs in empty declaration",
4218 declspecs
->thread_gnu_p
? "__thread" : "_Thread_local");
4223 && !in_system_header_at (input_location
)
4224 && (declspecs
->const_p
4225 || declspecs
->volatile_p
4226 || declspecs
->atomic_p
4227 || declspecs
->restrict_p
4228 || declspecs
->address_space
))
4230 warning (0, "useless type qualifier in empty declaration");
4234 if (!warned
&& !in_system_header_at (input_location
)
4235 && declspecs
->alignas_p
)
4237 warning (0, "useless %<_Alignas%> in empty declaration");
4244 pedwarn (input_location
, 0, "empty declaration");
4249 /* Return the qualifiers from SPECS as a bitwise OR of TYPE_QUAL_*
4250 bits. SPECS represents declaration specifiers that the grammar
4251 only permits to contain type qualifiers and attributes. */
4254 quals_from_declspecs (const struct c_declspecs
*specs
)
4256 int quals
= ((specs
->const_p
? TYPE_QUAL_CONST
: 0)
4257 | (specs
->volatile_p
? TYPE_QUAL_VOLATILE
: 0)
4258 | (specs
->restrict_p
? TYPE_QUAL_RESTRICT
: 0)
4259 | (specs
->atomic_p
? TYPE_QUAL_ATOMIC
: 0)
4260 | (ENCODE_QUAL_ADDR_SPACE (specs
->address_space
)));
4261 gcc_assert (!specs
->type
4262 && !specs
->decl_attr
4263 && specs
->typespec_word
== cts_none
4264 && specs
->storage_class
== csc_none
4265 && !specs
->typedef_p
4266 && !specs
->explicit_signed_p
4267 && !specs
->deprecated_p
4269 && !specs
->long_long_p
4272 && !specs
->unsigned_p
4273 && !specs
->complex_p
4275 && !specs
->noreturn_p
4276 && !specs
->thread_p
);
4280 /* Construct an array declarator. LOC is the location of the
4281 beginning of the array (usually the opening brace). EXPR is the
4282 expression inside [], or NULL_TREE. QUALS are the type qualifiers
4283 inside the [] (to be applied to the pointer to which a parameter
4284 array is converted). STATIC_P is true if "static" is inside the
4285 [], false otherwise. VLA_UNSPEC_P is true if the array is [*], a
4286 VLA of unspecified length which is nevertheless a complete type,
4287 false otherwise. The field for the contained declarator is left to
4288 be filled in by set_array_declarator_inner. */
4290 struct c_declarator
*
4291 build_array_declarator (location_t loc
,
4292 tree expr
, struct c_declspecs
*quals
, bool static_p
,
4295 struct c_declarator
*declarator
= XOBNEW (&parser_obstack
,
4296 struct c_declarator
);
4297 declarator
->id_loc
= loc
;
4298 declarator
->kind
= cdk_array
;
4299 declarator
->declarator
= 0;
4300 declarator
->u
.array
.dimen
= expr
;
4303 declarator
->u
.array
.attrs
= quals
->attrs
;
4304 declarator
->u
.array
.quals
= quals_from_declspecs (quals
);
4308 declarator
->u
.array
.attrs
= NULL_TREE
;
4309 declarator
->u
.array
.quals
= 0;
4311 declarator
->u
.array
.static_p
= static_p
;
4312 declarator
->u
.array
.vla_unspec_p
= vla_unspec_p
;
4313 if (static_p
|| quals
!= NULL
)
4314 pedwarn_c90 (loc
, OPT_Wpedantic
,
4315 "ISO C90 does not support %<static%> or type "
4316 "qualifiers in parameter array declarators");
4318 pedwarn_c90 (loc
, OPT_Wpedantic
,
4319 "ISO C90 does not support %<[*]%> array declarators");
4322 if (!current_scope
->parm_flag
)
4325 error_at (loc
, "%<[*]%> not allowed in other than "
4326 "function prototype scope");
4327 declarator
->u
.array
.vla_unspec_p
= false;
4330 current_scope
->had_vla_unspec
= true;
4335 /* Set the contained declarator of an array declarator. DECL is the
4336 declarator, as constructed by build_array_declarator; INNER is what
4337 appears on the left of the []. */
4339 struct c_declarator
*
4340 set_array_declarator_inner (struct c_declarator
*decl
,
4341 struct c_declarator
*inner
)
4343 decl
->declarator
= inner
;
4347 /* INIT is a constructor that forms DECL's initializer. If the final
4348 element initializes a flexible array field, add the size of that
4349 initializer to DECL's size. */
4352 add_flexible_array_elts_to_size (tree decl
, tree init
)
4356 if (vec_safe_is_empty (CONSTRUCTOR_ELTS (init
)))
4359 elt
= CONSTRUCTOR_ELTS (init
)->last ().value
;
4360 type
= TREE_TYPE (elt
);
4361 if (TREE_CODE (type
) == ARRAY_TYPE
4362 && TYPE_SIZE (type
) == NULL_TREE
4363 && TYPE_DOMAIN (type
) != NULL_TREE
4364 && TYPE_MAX_VALUE (TYPE_DOMAIN (type
)) == NULL_TREE
)
4366 complete_array_type (&type
, elt
, false);
4368 = size_binop (PLUS_EXPR
, DECL_SIZE (decl
), TYPE_SIZE (type
));
4369 DECL_SIZE_UNIT (decl
)
4370 = size_binop (PLUS_EXPR
, DECL_SIZE_UNIT (decl
), TYPE_SIZE_UNIT (type
));
4374 /* Decode a "typename", such as "int **", returning a ..._TYPE node.
4375 Set *EXPR, if EXPR not NULL, to any expression to be evaluated
4376 before the type name, and set *EXPR_CONST_OPERANDS, if
4377 EXPR_CONST_OPERANDS not NULL, to indicate whether the type name may
4378 appear in a constant expression. */
4381 groktypename (struct c_type_name
*type_name
, tree
*expr
,
4382 bool *expr_const_operands
)
4385 tree attrs
= type_name
->specs
->attrs
;
4387 type_name
->specs
->attrs
= NULL_TREE
;
4389 type
= grokdeclarator (type_name
->declarator
, type_name
->specs
, TYPENAME
,
4390 false, NULL
, &attrs
, expr
, expr_const_operands
,
4393 /* Apply attributes. */
4394 decl_attributes (&type
, attrs
, 0);
4399 /* Wrapper for decl_attributes that adds some implicit attributes
4400 to VAR_DECLs or FUNCTION_DECLs. */
4403 c_decl_attributes (tree
*node
, tree attributes
, int flags
)
4405 /* Add implicit "omp declare target" attribute if requested. */
4406 if (current_omp_declare_target_attribute
4407 && ((TREE_CODE (*node
) == VAR_DECL
4408 && (TREE_STATIC (*node
) || DECL_EXTERNAL (*node
)))
4409 || TREE_CODE (*node
) == FUNCTION_DECL
))
4411 if (TREE_CODE (*node
) == VAR_DECL
4412 && ((DECL_CONTEXT (*node
)
4413 && TREE_CODE (DECL_CONTEXT (*node
)) == FUNCTION_DECL
)
4414 || (current_function_decl
&& !DECL_EXTERNAL (*node
))))
4415 error ("%q+D in block scope inside of declare target directive",
4417 else if (TREE_CODE (*node
) == VAR_DECL
4418 && !lang_hooks
.types
.omp_mappable_type (TREE_TYPE (*node
)))
4419 error ("%q+D in declare target directive does not have mappable type",
4422 attributes
= tree_cons (get_identifier ("omp declare target"),
4423 NULL_TREE
, attributes
);
4425 return decl_attributes (node
, attributes
, flags
);
4429 /* Decode a declarator in an ordinary declaration or data definition.
4430 This is called as soon as the type information and variable name
4431 have been parsed, before parsing the initializer if any.
4432 Here we create the ..._DECL node, fill in its type,
4433 and put it on the list of decls for the current context.
4434 The ..._DECL node is returned as the value.
4436 Exception: for arrays where the length is not specified,
4437 the type is left null, to be filled in by `finish_decl'.
4439 Function definitions do not come here; they go to start_function
4440 instead. However, external and forward declarations of functions
4441 do go through here. Structure field declarations are done by
4442 grokfield and not through here. */
4445 start_decl (struct c_declarator
*declarator
, struct c_declspecs
*declspecs
,
4446 bool initialized
, tree attributes
)
4450 tree expr
= NULL_TREE
;
4451 enum deprecated_states deprecated_state
= DEPRECATED_NORMAL
;
4453 /* An object declared as __attribute__((deprecated)) suppresses
4454 warnings of uses of other deprecated items. */
4455 if (lookup_attribute ("deprecated", attributes
))
4456 deprecated_state
= DEPRECATED_SUPPRESS
;
4458 decl
= grokdeclarator (declarator
, declspecs
,
4459 NORMAL
, initialized
, NULL
, &attributes
, &expr
, NULL
,
4461 if (!decl
|| decl
== error_mark_node
)
4465 add_stmt (fold_convert (void_type_node
, expr
));
4467 if (TREE_CODE (decl
) != FUNCTION_DECL
&& MAIN_NAME_P (DECL_NAME (decl
)))
4468 warning (OPT_Wmain
, "%q+D is usually a function", decl
);
4471 /* Is it valid for this decl to have an initializer at all?
4472 If not, set INITIALIZED to zero, which will indirectly
4473 tell 'finish_decl' to ignore the initializer once it is parsed. */
4474 switch (TREE_CODE (decl
))
4477 error ("typedef %qD is initialized (use __typeof__ instead)", decl
);
4482 error ("function %qD is initialized like a variable", decl
);
4487 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
4488 error ("parameter %qD is initialized", decl
);
4493 /* Don't allow initializations for incomplete types except for
4494 arrays which might be completed by the initialization. */
4496 /* This can happen if the array size is an undefined macro.
4497 We already gave a warning, so we don't need another one. */
4498 if (TREE_TYPE (decl
) == error_mark_node
)
4500 else if (COMPLETE_TYPE_P (TREE_TYPE (decl
)))
4502 /* A complete type is ok if size is fixed. */
4504 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl
))) != INTEGER_CST
4505 || C_DECL_VARIABLE_SIZE (decl
))
4507 error ("variable-sized object may not be initialized");
4511 else if (TREE_CODE (TREE_TYPE (decl
)) != ARRAY_TYPE
)
4513 error ("variable %qD has initializer but incomplete type", decl
);
4516 else if (C_DECL_VARIABLE_SIZE (decl
))
4518 /* Although C99 is unclear about whether incomplete arrays
4519 of VLAs themselves count as VLAs, it does not make
4520 sense to permit them to be initialized given that
4521 ordinary VLAs may not be initialized. */
4522 error ("variable-sized object may not be initialized");
4529 if (current_scope
== file_scope
)
4530 TREE_STATIC (decl
) = 1;
4532 /* Tell 'pushdecl' this is an initialized decl
4533 even though we don't yet have the initializer expression.
4534 Also tell 'finish_decl' it may store the real initializer. */
4535 DECL_INITIAL (decl
) = error_mark_node
;
4538 /* If this is a function declaration, write a record describing it to the
4539 prototypes file (if requested). */
4541 if (TREE_CODE (decl
) == FUNCTION_DECL
)
4542 gen_aux_info_record (decl
, 0, 0, prototype_p (TREE_TYPE (decl
)));
4544 /* ANSI specifies that a tentative definition which is not merged with
4545 a non-tentative definition behaves exactly like a definition with an
4546 initializer equal to zero. (Section 3.7.2)
4548 -fno-common gives strict ANSI behavior, though this tends to break
4549 a large body of code that grew up without this rule.
4551 Thread-local variables are never common, since there's no entrenched
4552 body of code to break, and it allows more efficient variable references
4553 in the presence of dynamic linking. */
4555 if (TREE_CODE (decl
) == VAR_DECL
4557 && TREE_PUBLIC (decl
)
4558 && !DECL_THREAD_LOCAL_P (decl
)
4560 DECL_COMMON (decl
) = 1;
4562 /* Set attributes here so if duplicate decl, will have proper attributes. */
4563 c_decl_attributes (&decl
, attributes
, 0);
4565 /* Handle gnu_inline attribute. */
4566 if (declspecs
->inline_p
4567 && !flag_gnu89_inline
4568 && TREE_CODE (decl
) == FUNCTION_DECL
4569 && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl
))
4570 || current_function_decl
))
4572 if (declspecs
->storage_class
== csc_auto
&& current_scope
!= file_scope
)
4574 else if (declspecs
->storage_class
!= csc_static
)
4575 DECL_EXTERNAL (decl
) = !DECL_EXTERNAL (decl
);
4578 if (TREE_CODE (decl
) == FUNCTION_DECL
4579 && targetm
.calls
.promote_prototypes (TREE_TYPE (decl
)))
4581 struct c_declarator
*ce
= declarator
;
4583 if (ce
->kind
== cdk_pointer
)
4584 ce
= declarator
->declarator
;
4585 if (ce
->kind
== cdk_function
)
4587 tree args
= ce
->u
.arg_info
->parms
;
4588 for (; args
; args
= DECL_CHAIN (args
))
4590 tree type
= TREE_TYPE (args
);
4591 if (type
&& INTEGRAL_TYPE_P (type
)
4592 && TYPE_PRECISION (type
) < TYPE_PRECISION (integer_type_node
))
4593 DECL_ARG_TYPE (args
) = c_type_promotes_to (type
);
4598 if (TREE_CODE (decl
) == FUNCTION_DECL
4599 && DECL_DECLARED_INLINE_P (decl
)
4600 && DECL_UNINLINABLE (decl
)
4601 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl
)))
4602 warning (OPT_Wattributes
, "inline function %q+D given attribute noinline",
4605 /* C99 6.7.4p3: An inline definition of a function with external
4606 linkage shall not contain a definition of a modifiable object
4607 with static storage duration... */
4608 if (TREE_CODE (decl
) == VAR_DECL
4609 && current_scope
!= file_scope
4610 && TREE_STATIC (decl
)
4611 && !TREE_READONLY (decl
)
4612 && DECL_DECLARED_INLINE_P (current_function_decl
)
4613 && DECL_EXTERNAL (current_function_decl
))
4614 record_inline_static (input_location
, current_function_decl
,
4615 decl
, csi_modifiable
);
4617 if (c_dialect_objc ()
4618 && VAR_OR_FUNCTION_DECL_P (decl
))
4619 objc_check_global_decl (decl
);
4621 /* Add this decl to the current scope.
4622 TEM may equal DECL or it may be a previous decl of the same name. */
4623 tem
= pushdecl (decl
);
4625 if (initialized
&& DECL_EXTERNAL (tem
))
4627 DECL_EXTERNAL (tem
) = 0;
4628 TREE_STATIC (tem
) = 1;
4634 /* Subroutine of finish_decl. TYPE is the type of an uninitialized object
4635 DECL or the non-array element type if DECL is an uninitialized array.
4636 If that type has a const member, diagnose this. */
4639 diagnose_uninitialized_cst_member (tree decl
, tree type
)
4642 for (field
= TYPE_FIELDS (type
); field
; field
= TREE_CHAIN (field
))
4645 if (TREE_CODE (field
) != FIELD_DECL
)
4647 field_type
= strip_array_types (TREE_TYPE (field
));
4649 if (TYPE_QUALS (field_type
) & TYPE_QUAL_CONST
)
4651 warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wc___compat
,
4652 "uninitialized const member in %qT is invalid in C++",
4653 strip_array_types (TREE_TYPE (decl
)));
4654 inform (DECL_SOURCE_LOCATION (field
), "%qD should be initialized", field
);
4657 if (TREE_CODE (field_type
) == RECORD_TYPE
4658 || TREE_CODE (field_type
) == UNION_TYPE
)
4659 diagnose_uninitialized_cst_member (decl
, field_type
);
4663 /* Finish processing of a declaration;
4664 install its initial value.
4665 If ORIGTYPE is not NULL_TREE, it is the original type of INIT.
4666 If the length of an array type is not known before,
4667 it must be determined now, from the initial value, or it is an error.
4669 INIT_LOC is the location of the initial value. */
4672 finish_decl (tree decl
, location_t init_loc
, tree init
,
4673 tree origtype
, tree asmspec_tree
)
4676 bool was_incomplete
= (DECL_SIZE (decl
) == 0);
4677 const char *asmspec
= 0;
4679 /* If a name was specified, get the string. */
4680 if (VAR_OR_FUNCTION_DECL_P (decl
)
4681 && DECL_FILE_SCOPE_P (decl
))
4682 asmspec_tree
= maybe_apply_renaming_pragma (decl
, asmspec_tree
);
4684 asmspec
= TREE_STRING_POINTER (asmspec_tree
);
4686 if (TREE_CODE (decl
) == VAR_DECL
4687 && TREE_STATIC (decl
)
4688 && global_bindings_p ())
4689 /* So decl is a global variable. Record the types it uses
4690 so that we can decide later to emit debug info for them. */
4691 record_types_used_by_current_var_decl (decl
);
4693 /* If `start_decl' didn't like having an initialization, ignore it now. */
4694 if (init
!= 0 && DECL_INITIAL (decl
) == 0)
4697 /* Don't crash if parm is initialized. */
4698 if (TREE_CODE (decl
) == PARM_DECL
)
4702 store_init_value (init_loc
, decl
, init
, origtype
);
4704 if (c_dialect_objc () && (VAR_OR_FUNCTION_DECL_P (decl
)
4705 || TREE_CODE (decl
) == FIELD_DECL
))
4706 objc_check_decl (decl
);
4708 type
= TREE_TYPE (decl
);
4710 /* Deduce size of array from initialization, if not already known. */
4711 if (TREE_CODE (type
) == ARRAY_TYPE
4712 && TYPE_DOMAIN (type
) == 0
4713 && TREE_CODE (decl
) != TYPE_DECL
)
4716 = (TREE_STATIC (decl
)
4717 /* Even if pedantic, an external linkage array
4718 may have incomplete type at first. */
4719 ? pedantic
&& !TREE_PUBLIC (decl
)
4720 : !DECL_EXTERNAL (decl
));
4722 = complete_array_type (&TREE_TYPE (decl
), DECL_INITIAL (decl
),
4725 /* Get the completed type made by complete_array_type. */
4726 type
= TREE_TYPE (decl
);
4731 error ("initializer fails to determine size of %q+D", decl
);
4736 error ("array size missing in %q+D", decl
);
4737 /* If a `static' var's size isn't known,
4738 make it extern as well as static, so it does not get
4740 If it is not `static', then do not mark extern;
4741 finish_incomplete_decl will give it a default size
4742 and it will get allocated. */
4743 else if (!pedantic
&& TREE_STATIC (decl
) && !TREE_PUBLIC (decl
))
4744 DECL_EXTERNAL (decl
) = 1;
4748 error ("zero or negative size array %q+D", decl
);
4752 /* For global variables, update the copy of the type that
4753 exists in the binding. */
4754 if (TREE_PUBLIC (decl
))
4756 struct c_binding
*b_ext
= I_SYMBOL_BINDING (DECL_NAME (decl
));
4757 while (b_ext
&& !B_IN_EXTERNAL_SCOPE (b_ext
))
4758 b_ext
= b_ext
->shadowed
;
4761 if (b_ext
->u
.type
&& comptypes (b_ext
->u
.type
, type
))
4762 b_ext
->u
.type
= composite_type (b_ext
->u
.type
, type
);
4764 b_ext
->u
.type
= type
;
4773 if (DECL_INITIAL (decl
))
4774 TREE_TYPE (DECL_INITIAL (decl
)) = type
;
4776 relayout_decl (decl
);
4779 if (TREE_CODE (decl
) == VAR_DECL
)
4781 if (init
&& TREE_CODE (init
) == CONSTRUCTOR
)
4782 add_flexible_array_elts_to_size (decl
, init
);
4784 if (DECL_SIZE (decl
) == 0 && TREE_TYPE (decl
) != error_mark_node
4785 && COMPLETE_TYPE_P (TREE_TYPE (decl
)))
4786 layout_decl (decl
, 0);
4788 if (DECL_SIZE (decl
) == 0
4789 /* Don't give an error if we already gave one earlier. */
4790 && TREE_TYPE (decl
) != error_mark_node
4791 && (TREE_STATIC (decl
)
4792 /* A static variable with an incomplete type
4793 is an error if it is initialized.
4794 Also if it is not file scope.
4795 Otherwise, let it through, but if it is not `extern'
4796 then it may cause an error message later. */
4797 ? (DECL_INITIAL (decl
) != 0
4798 || !DECL_FILE_SCOPE_P (decl
))
4799 /* An automatic variable with an incomplete type
4801 : !DECL_EXTERNAL (decl
)))
4803 error ("storage size of %q+D isn%'t known", decl
);
4804 TREE_TYPE (decl
) = error_mark_node
;
4807 if ((DECL_EXTERNAL (decl
) || TREE_STATIC (decl
))
4808 && DECL_SIZE (decl
) != 0)
4810 if (TREE_CODE (DECL_SIZE (decl
)) == INTEGER_CST
)
4811 constant_expression_warning (DECL_SIZE (decl
));
4814 error ("storage size of %q+D isn%'t constant", decl
);
4815 TREE_TYPE (decl
) = error_mark_node
;
4819 if (TREE_USED (type
))
4821 TREE_USED (decl
) = 1;
4822 DECL_READ_P (decl
) = 1;
4826 /* If this is a function and an assembler name is specified, reset DECL_RTL
4827 so we can give it its new name. Also, update builtin_decl if it
4828 was a normal built-in. */
4829 if (TREE_CODE (decl
) == FUNCTION_DECL
&& asmspec
)
4831 if (DECL_BUILT_IN_CLASS (decl
) == BUILT_IN_NORMAL
)
4832 set_builtin_user_assembler_name (decl
, asmspec
);
4833 set_user_assembler_name (decl
, asmspec
);
4836 /* If #pragma weak was used, mark the decl weak now. */
4837 maybe_apply_pragma_weak (decl
);
4839 /* Output the assembler code and/or RTL code for variables and functions,
4840 unless the type is an undefined structure or union.
4841 If not, it will get done when the type is completed. */
4843 if (VAR_OR_FUNCTION_DECL_P (decl
))
4845 /* Determine the ELF visibility. */
4846 if (TREE_PUBLIC (decl
))
4847 c_determine_visibility (decl
);
4849 /* This is a no-op in c-lang.c or something real in objc-act.c. */
4850 if (c_dialect_objc ())
4851 objc_check_decl (decl
);
4855 /* If this is not a static variable, issue a warning.
4856 It doesn't make any sense to give an ASMSPEC for an
4857 ordinary, non-register local variable. Historically,
4858 GCC has accepted -- but ignored -- the ASMSPEC in
4860 if (!DECL_FILE_SCOPE_P (decl
)
4861 && TREE_CODE (decl
) == VAR_DECL
4862 && !C_DECL_REGISTER (decl
)
4863 && !TREE_STATIC (decl
))
4864 warning (0, "ignoring asm-specifier for non-static local "
4865 "variable %q+D", decl
);
4867 set_user_assembler_name (decl
, asmspec
);
4870 if (DECL_FILE_SCOPE_P (decl
))
4872 if (DECL_INITIAL (decl
) == NULL_TREE
4873 || DECL_INITIAL (decl
) == error_mark_node
)
4874 /* Don't output anything
4875 when a tentative file-scope definition is seen.
4876 But at end of compilation, do output code for them. */
4877 DECL_DEFER_OUTPUT (decl
) = 1;
4878 if (asmspec
&& C_DECL_REGISTER (decl
))
4879 DECL_HARD_REGISTER (decl
) = 1;
4880 rest_of_decl_compilation (decl
, true, 0);
4884 /* In conjunction with an ASMSPEC, the `register'
4885 keyword indicates that we should place the variable
4886 in a particular register. */
4887 if (asmspec
&& C_DECL_REGISTER (decl
))
4889 DECL_HARD_REGISTER (decl
) = 1;
4890 /* This cannot be done for a structure with volatile
4891 fields, on which DECL_REGISTER will have been
4893 if (!DECL_REGISTER (decl
))
4894 error ("cannot put object with volatile field into register");
4897 if (TREE_CODE (decl
) != FUNCTION_DECL
)
4899 /* If we're building a variable sized type, and we might be
4900 reachable other than via the top of the current binding
4901 level, then create a new BIND_EXPR so that we deallocate
4902 the object at the right time. */
4903 /* Note that DECL_SIZE can be null due to errors. */
4904 if (DECL_SIZE (decl
)
4905 && !TREE_CONSTANT (DECL_SIZE (decl
))
4906 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list
))
4909 bind
= build3 (BIND_EXPR
, void_type_node
, NULL
, NULL
, NULL
);
4910 TREE_SIDE_EFFECTS (bind
) = 1;
4912 BIND_EXPR_BODY (bind
) = push_stmt_list ();
4914 add_stmt (build_stmt (DECL_SOURCE_LOCATION (decl
),
4920 if (!DECL_FILE_SCOPE_P (decl
))
4922 /* Recompute the RTL of a local array now
4923 if it used to be an incomplete type. */
4925 && !TREE_STATIC (decl
) && !DECL_EXTERNAL (decl
))
4927 /* If we used it already as memory, it must stay in memory. */
4928 TREE_ADDRESSABLE (decl
) = TREE_USED (decl
);
4929 /* If it's still incomplete now, no init will save it. */
4930 if (DECL_SIZE (decl
) == 0)
4931 DECL_INITIAL (decl
) = 0;
4936 if (TREE_CODE (decl
) == TYPE_DECL
)
4938 if (!DECL_FILE_SCOPE_P (decl
)
4939 && variably_modified_type_p (TREE_TYPE (decl
), NULL_TREE
))
4940 add_stmt (build_stmt (DECL_SOURCE_LOCATION (decl
), DECL_EXPR
, decl
));
4942 rest_of_decl_compilation (decl
, DECL_FILE_SCOPE_P (decl
), 0);
4945 /* Install a cleanup (aka destructor) if one was given. */
4946 if (TREE_CODE (decl
) == VAR_DECL
&& !TREE_STATIC (decl
))
4948 tree attr
= lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl
));
4951 tree cleanup_id
= TREE_VALUE (TREE_VALUE (attr
));
4952 tree cleanup_decl
= lookup_name (cleanup_id
);
4954 vec
<tree
, va_gc
> *v
;
4956 /* Build "cleanup(&decl)" for the destructor. */
4957 cleanup
= build_unary_op (input_location
, ADDR_EXPR
, decl
, 0);
4959 v
->quick_push (cleanup
);
4960 cleanup
= c_build_function_call_vec (DECL_SOURCE_LOCATION (decl
),
4961 vNULL
, cleanup_decl
, v
, NULL
);
4964 /* Don't warn about decl unused; the cleanup uses it. */
4965 TREE_USED (decl
) = 1;
4966 TREE_USED (cleanup_decl
) = 1;
4967 DECL_READ_P (decl
) = 1;
4969 push_cleanup (decl
, cleanup
, false);
4974 && TREE_CODE (decl
) == VAR_DECL
4975 && !DECL_EXTERNAL (decl
)
4976 && DECL_INITIAL (decl
) == NULL_TREE
)
4978 type
= strip_array_types (type
);
4979 if (TREE_READONLY (decl
))
4980 warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wc___compat
,
4981 "uninitialized const %qD is invalid in C++", decl
);
4982 else if ((TREE_CODE (type
) == RECORD_TYPE
4983 || TREE_CODE (type
) == UNION_TYPE
)
4984 && C_TYPE_FIELDS_READONLY (type
))
4985 diagnose_uninitialized_cst_member (decl
, type
);
4988 invoke_plugin_callbacks (PLUGIN_FINISH_DECL
, decl
);
4991 /* Given a parsed parameter declaration, decode it into a PARM_DECL.
4992 EXPR is NULL or a pointer to an expression that needs to be
4993 evaluated for the side effects of array size expressions in the
4997 grokparm (const struct c_parm
*parm
, tree
*expr
)
4999 tree attrs
= parm
->attrs
;
5000 tree decl
= grokdeclarator (parm
->declarator
, parm
->specs
, PARM
, false,
5001 NULL
, &attrs
, expr
, NULL
, DEPRECATED_NORMAL
);
5003 decl_attributes (&decl
, attrs
, 0);
5008 /* Given a parsed parameter declaration, decode it into a PARM_DECL
5009 and push that on the current scope. EXPR is a pointer to an
5010 expression that needs to be evaluated for the side effects of array
5011 size expressions in the parameters. */
5014 push_parm_decl (const struct c_parm
*parm
, tree
*expr
)
5016 tree attrs
= parm
->attrs
;
5019 decl
= grokdeclarator (parm
->declarator
, parm
->specs
, PARM
, false, NULL
,
5020 &attrs
, expr
, NULL
, DEPRECATED_NORMAL
);
5021 decl_attributes (&decl
, attrs
, 0);
5023 decl
= pushdecl (decl
);
5025 finish_decl (decl
, input_location
, NULL_TREE
, NULL_TREE
, NULL_TREE
);
5028 /* Mark all the parameter declarations to date as forward decls.
5029 Also diagnose use of this extension. */
5032 mark_forward_parm_decls (void)
5034 struct c_binding
*b
;
5036 if (pedantic
&& !current_scope
->warned_forward_parm_decls
)
5038 pedwarn (input_location
, OPT_Wpedantic
,
5039 "ISO C forbids forward parameter declarations");
5040 current_scope
->warned_forward_parm_decls
= true;
5043 for (b
= current_scope
->bindings
; b
; b
= b
->prev
)
5044 if (TREE_CODE (b
->decl
) == PARM_DECL
)
5045 TREE_ASM_WRITTEN (b
->decl
) = 1;
5048 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
5049 literal, which may be an incomplete array type completed by the
5050 initializer; INIT is a CONSTRUCTOR at LOC that initializes the compound
5051 literal. NON_CONST is true if the initializers contain something
5052 that cannot occur in a constant expression. */
5055 build_compound_literal (location_t loc
, tree type
, tree init
, bool non_const
)
5057 /* We do not use start_decl here because we have a type, not a declarator;
5058 and do not use finish_decl because the decl should be stored inside
5059 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_EXPR. */
5064 if (type
== error_mark_node
5065 || init
== error_mark_node
)
5066 return error_mark_node
;
5068 decl
= build_decl (loc
, VAR_DECL
, NULL_TREE
, type
);
5069 DECL_EXTERNAL (decl
) = 0;
5070 TREE_PUBLIC (decl
) = 0;
5071 TREE_STATIC (decl
) = (current_scope
== file_scope
);
5072 DECL_CONTEXT (decl
) = current_function_decl
;
5073 TREE_USED (decl
) = 1;
5074 DECL_READ_P (decl
) = 1;
5075 TREE_TYPE (decl
) = type
;
5076 TREE_READONLY (decl
) = (TYPE_READONLY (type
)
5077 || (TREE_CODE (type
) == ARRAY_TYPE
5078 && TYPE_READONLY (TREE_TYPE (type
))));
5079 store_init_value (loc
, decl
, init
, NULL_TREE
);
5081 if (TREE_CODE (type
) == ARRAY_TYPE
&& !COMPLETE_TYPE_P (type
))
5083 int failure
= complete_array_type (&TREE_TYPE (decl
),
5084 DECL_INITIAL (decl
), true);
5085 /* If complete_array_type returns 3, it means that the
5086 initial value of the compound literal is empty. Allow it. */
5087 gcc_assert (failure
== 0 || failure
== 3);
5089 type
= TREE_TYPE (decl
);
5090 TREE_TYPE (DECL_INITIAL (decl
)) = type
;
5093 if (type
== error_mark_node
|| !COMPLETE_TYPE_P (type
))
5095 c_incomplete_type_error (NULL_TREE
, type
);
5096 return error_mark_node
;
5099 stmt
= build_stmt (DECL_SOURCE_LOCATION (decl
), DECL_EXPR
, decl
);
5100 complit
= build1 (COMPOUND_LITERAL_EXPR
, type
, stmt
);
5101 TREE_SIDE_EFFECTS (complit
) = 1;
5103 layout_decl (decl
, 0);
5105 if (TREE_STATIC (decl
))
5107 /* This decl needs a name for the assembler output. */
5108 set_compound_literal_name (decl
);
5109 DECL_DEFER_OUTPUT (decl
) = 1;
5110 DECL_COMDAT (decl
) = 1;
5111 DECL_ARTIFICIAL (decl
) = 1;
5112 DECL_IGNORED_P (decl
) = 1;
5114 rest_of_decl_compilation (decl
, 1, 0);
5119 complit
= build2 (C_MAYBE_CONST_EXPR
, type
, NULL
, complit
);
5120 C_MAYBE_CONST_EXPR_NON_CONST (complit
) = 1;
5126 /* Check the type of a compound literal. Here we just check that it
5127 is valid for C++. */
5130 check_compound_literal_type (location_t loc
, struct c_type_name
*type_name
)
5133 && (type_name
->specs
->typespec_kind
== ctsk_tagdef
5134 || type_name
->specs
->typespec_kind
== ctsk_tagfirstref
))
5135 warning_at (loc
, OPT_Wc___compat
,
5136 "defining a type in a compound literal is invalid in C++");
5139 /* Determine whether TYPE is a structure with a flexible array member,
5140 or a union containing such a structure (possibly recursively). */
5143 flexible_array_type_p (tree type
)
5146 switch (TREE_CODE (type
))
5149 x
= TYPE_FIELDS (type
);
5152 while (DECL_CHAIN (x
) != NULL_TREE
)
5154 if (TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
5155 && TYPE_SIZE (TREE_TYPE (x
)) == NULL_TREE
5156 && TYPE_DOMAIN (TREE_TYPE (x
)) != NULL_TREE
5157 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x
))) == NULL_TREE
)
5161 for (x
= TYPE_FIELDS (type
); x
!= NULL_TREE
; x
= DECL_CHAIN (x
))
5163 if (flexible_array_type_p (TREE_TYPE (x
)))
5172 /* Performs sanity checks on the TYPE and WIDTH of the bit-field NAME,
5173 replacing with appropriate values if they are invalid. */
5175 check_bitfield_type_and_width (tree
*type
, tree
*width
, tree orig_name
)
5178 unsigned int max_width
;
5179 unsigned HOST_WIDE_INT w
;
5180 const char *name
= (orig_name
5181 ? identifier_to_locale (IDENTIFIER_POINTER (orig_name
))
5182 : _("<anonymous>"));
5184 /* Detect and ignore out of range field width and process valid
5186 if (!INTEGRAL_TYPE_P (TREE_TYPE (*width
)))
5188 error ("bit-field %qs width not an integer constant", name
);
5189 *width
= integer_one_node
;
5193 if (TREE_CODE (*width
) != INTEGER_CST
)
5195 *width
= c_fully_fold (*width
, false, NULL
);
5196 if (TREE_CODE (*width
) == INTEGER_CST
)
5197 pedwarn (input_location
, OPT_Wpedantic
,
5198 "bit-field %qs width not an integer constant expression",
5201 if (TREE_CODE (*width
) != INTEGER_CST
)
5203 error ("bit-field %qs width not an integer constant", name
);
5204 *width
= integer_one_node
;
5206 constant_expression_warning (*width
);
5207 if (tree_int_cst_sgn (*width
) < 0)
5209 error ("negative width in bit-field %qs", name
);
5210 *width
= integer_one_node
;
5212 else if (integer_zerop (*width
) && orig_name
)
5214 error ("zero width for bit-field %qs", name
);
5215 *width
= integer_one_node
;
5219 /* Detect invalid bit-field type. */
5220 if (TREE_CODE (*type
) != INTEGER_TYPE
5221 && TREE_CODE (*type
) != BOOLEAN_TYPE
5222 && TREE_CODE (*type
) != ENUMERAL_TYPE
)
5224 error ("bit-field %qs has invalid type", name
);
5225 *type
= unsigned_type_node
;
5228 type_mv
= TYPE_MAIN_VARIANT (*type
);
5229 if (!in_system_header_at (input_location
)
5230 && type_mv
!= integer_type_node
5231 && type_mv
!= unsigned_type_node
5232 && type_mv
!= boolean_type_node
)
5233 pedwarn_c90 (input_location
, OPT_Wpedantic
,
5234 "type of bit-field %qs is a GCC extension", name
);
5236 max_width
= TYPE_PRECISION (*type
);
5238 if (0 < compare_tree_int (*width
, max_width
))
5240 error ("width of %qs exceeds its type", name
);
5242 *width
= build_int_cst (integer_type_node
, w
);
5245 w
= tree_to_uhwi (*width
);
5247 if (TREE_CODE (*type
) == ENUMERAL_TYPE
)
5249 struct lang_type
*lt
= TYPE_LANG_SPECIFIC (*type
);
5251 || w
< tree_int_cst_min_precision (lt
->enum_min
, TYPE_SIGN (*type
))
5252 || w
< tree_int_cst_min_precision (lt
->enum_max
, TYPE_SIGN (*type
)))
5253 warning (0, "%qs is narrower than values of its type", name
);
5259 /* Print warning about variable length array if necessary. */
5262 warn_variable_length_array (tree name
, tree size
)
5264 if (TREE_CONSTANT (size
))
5267 pedwarn_c90 (input_location
, OPT_Wvla
,
5268 "ISO C90 forbids array %qE whose size "
5269 "can%'t be evaluated", name
);
5271 pedwarn_c90 (input_location
, OPT_Wvla
, "ISO C90 forbids array "
5272 "whose size can%'t be evaluated");
5277 pedwarn_c90 (input_location
, OPT_Wvla
,
5278 "ISO C90 forbids variable length array %qE", name
);
5280 pedwarn_c90 (input_location
, OPT_Wvla
, "ISO C90 forbids variable "
5285 /* Print warning about defaulting to int if necessary. */
5288 warn_defaults_to (location_t location
, int opt
, const char *gmsgid
, ...)
5290 diagnostic_info diagnostic
;
5293 va_start (ap
, gmsgid
);
5294 diagnostic_set_info (&diagnostic
, gmsgid
, &ap
, location
,
5295 flag_isoc99
? DK_PEDWARN
: DK_WARNING
);
5296 diagnostic
.option_index
= opt
;
5297 report_diagnostic (&diagnostic
);
5301 /* Given declspecs and a declarator,
5302 determine the name and type of the object declared
5303 and construct a ..._DECL node for it.
5304 (In one case we can return a ..._TYPE node instead.
5305 For invalid input we sometimes return 0.)
5307 DECLSPECS is a c_declspecs structure for the declaration specifiers.
5309 DECL_CONTEXT says which syntactic context this declaration is in:
5310 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
5311 FUNCDEF for a function definition. Like NORMAL but a few different
5312 error messages in each case. Return value may be zero meaning
5313 this definition is too screwy to try to parse.
5314 PARM for a parameter declaration (either within a function prototype
5315 or before a function body). Make a PARM_DECL, or return void_type_node.
5316 TYPENAME if for a typename (in a cast or sizeof).
5317 Don't make a DECL node; just return the ..._TYPE node.
5318 FIELD for a struct or union field; make a FIELD_DECL.
5319 INITIALIZED is true if the decl has an initializer.
5320 WIDTH is non-NULL for bit-fields, and is a pointer to an INTEGER_CST node
5321 representing the width of the bit-field.
5322 DECL_ATTRS points to the list of attributes that should be added to this
5323 decl. Any nested attributes that belong on the decl itself will be
5325 If EXPR is not NULL, any expressions that need to be evaluated as
5326 part of evaluating variably modified types will be stored in *EXPR.
5327 If EXPR_CONST_OPERANDS is not NULL, *EXPR_CONST_OPERANDS will be
5328 set to indicate whether operands in *EXPR can be used in constant
5330 DEPRECATED_STATE is a deprecated_states value indicating whether
5331 deprecation warnings should be suppressed.
5333 In the TYPENAME case, DECLARATOR is really an absolute declarator.
5334 It may also be so in the PARM case, for a prototype where the
5335 argument type is specified but not the name.
5337 This function is where the complicated C meanings of `static'
5338 and `extern' are interpreted. */
5341 grokdeclarator (const struct c_declarator
*declarator
,
5342 struct c_declspecs
*declspecs
,
5343 enum decl_context decl_context
, bool initialized
, tree
*width
,
5344 tree
*decl_attrs
, tree
*expr
, bool *expr_const_operands
,
5345 enum deprecated_states deprecated_state
)
5347 tree type
= declspecs
->type
;
5348 bool threadp
= declspecs
->thread_p
;
5349 enum c_storage_class storage_class
= declspecs
->storage_class
;
5354 int type_quals
= TYPE_UNQUALIFIED
;
5355 tree name
= NULL_TREE
;
5356 bool funcdef_flag
= false;
5357 bool funcdef_syntax
= false;
5358 bool size_varies
= false;
5359 tree decl_attr
= declspecs
->decl_attr
;
5360 int array_ptr_quals
= TYPE_UNQUALIFIED
;
5361 tree array_ptr_attrs
= NULL_TREE
;
5362 int array_parm_static
= 0;
5363 bool array_parm_vla_unspec_p
= false;
5364 tree returned_attrs
= NULL_TREE
;
5365 bool bitfield
= width
!= NULL
;
5367 struct c_arg_info
*arg_info
= 0;
5368 addr_space_t as1
, as2
, address_space
;
5369 location_t loc
= UNKNOWN_LOCATION
;
5372 bool expr_const_operands_dummy
;
5373 enum c_declarator_kind first_non_attr_kind
;
5374 unsigned int alignas_align
= 0;
5376 if (TREE_CODE (type
) == ERROR_MARK
)
5377 return error_mark_node
;
5380 if (expr_const_operands
== NULL
)
5381 expr_const_operands
= &expr_const_operands_dummy
;
5383 *expr
= declspecs
->expr
;
5384 *expr_const_operands
= declspecs
->expr_const_operands
;
5386 if (decl_context
== FUNCDEF
)
5387 funcdef_flag
= true, decl_context
= NORMAL
;
5389 /* Look inside a declarator for the name being declared
5390 and get it as an IDENTIFIER_NODE, for an error message. */
5392 const struct c_declarator
*decl
= declarator
;
5394 first_non_attr_kind
= cdk_attrs
;
5404 funcdef_syntax
= (decl
->kind
== cdk_function
);
5405 decl
= decl
->declarator
;
5406 if (first_non_attr_kind
== cdk_attrs
)
5407 first_non_attr_kind
= decl
->kind
;
5411 decl
= decl
->declarator
;
5418 if (first_non_attr_kind
== cdk_attrs
)
5419 first_non_attr_kind
= decl
->kind
;
5428 gcc_assert (decl_context
== PARM
5429 || decl_context
== TYPENAME
5430 || (decl_context
== FIELD
5431 && declarator
->kind
== cdk_id
));
5432 gcc_assert (!initialized
);
5436 /* A function definition's declarator must have the form of
5437 a function declarator. */
5439 if (funcdef_flag
&& !funcdef_syntax
)
5442 /* If this looks like a function definition, make it one,
5443 even if it occurs where parms are expected.
5444 Then store_parm_decls will reject it and not use it as a parm. */
5445 if (decl_context
== NORMAL
&& !funcdef_flag
&& current_scope
->parm_flag
)
5446 decl_context
= PARM
;
5448 if (declspecs
->deprecated_p
&& deprecated_state
!= DEPRECATED_SUPPRESS
)
5449 warn_deprecated_use (declspecs
->type
, declspecs
->decl_attr
);
5451 if ((decl_context
== NORMAL
|| decl_context
== FIELD
)
5452 && current_scope
== file_scope
5453 && variably_modified_type_p (type
, NULL_TREE
))
5456 error_at (loc
, "variably modified %qE at file scope", name
);
5458 error_at (loc
, "variably modified field at file scope");
5459 type
= integer_type_node
;
5462 size_varies
= C_TYPE_VARIABLE_SIZE (type
) != 0;
5464 /* Diagnose defaulting to "int". */
5466 if (declspecs
->default_int_p
&& !in_system_header_at (input_location
))
5468 /* Issue a warning if this is an ISO C 99 program or if
5469 -Wreturn-type and this is a function, or if -Wimplicit;
5470 prefer the former warning since it is more explicit. */
5471 if ((warn_implicit_int
|| warn_return_type
|| flag_isoc99
)
5473 warn_about_return_type
= 1;
5477 warn_defaults_to (loc
, OPT_Wimplicit_int
,
5478 "type defaults to %<int%> in declaration "
5481 warn_defaults_to (loc
, OPT_Wimplicit_int
,
5482 "type defaults to %<int%> in type name");
5486 /* Adjust the type if a bit-field is being declared,
5487 -funsigned-bitfields applied and the type is not explicitly
5489 if (bitfield
&& !flag_signed_bitfields
&& !declspecs
->explicit_signed_p
5490 && TREE_CODE (type
) == INTEGER_TYPE
)
5491 type
= unsigned_type_for (type
);
5493 /* Figure out the type qualifiers for the declaration. There are
5494 two ways a declaration can become qualified. One is something
5495 like `const int i' where the `const' is explicit. Another is
5496 something like `typedef const int CI; CI i' where the type of the
5497 declaration contains the `const'. A third possibility is that
5498 there is a type qualifier on the element type of a typedefed
5499 array type, in which case we should extract that qualifier so
5500 that c_apply_type_quals_to_decl receives the full list of
5501 qualifiers to work with (C90 is not entirely clear about whether
5502 duplicate qualifiers should be diagnosed in this case, but it
5503 seems most appropriate to do so). */
5504 element_type
= strip_array_types (type
);
5505 constp
= declspecs
->const_p
+ TYPE_READONLY (element_type
);
5506 restrictp
= declspecs
->restrict_p
+ TYPE_RESTRICT (element_type
);
5507 volatilep
= declspecs
->volatile_p
+ TYPE_VOLATILE (element_type
);
5508 atomicp
= declspecs
->atomic_p
+ TYPE_ATOMIC (element_type
);
5509 as1
= declspecs
->address_space
;
5510 as2
= TYPE_ADDR_SPACE (element_type
);
5511 address_space
= ADDR_SPACE_GENERIC_P (as1
)? as2
: as1
;
5514 pedwarn_c90 (loc
, OPT_Wpedantic
, "duplicate %<const%>");
5516 pedwarn_c90 (loc
, OPT_Wpedantic
, "duplicate %<restrict%>");
5518 pedwarn_c90 (loc
, OPT_Wpedantic
, "duplicate %<volatile%>");
5520 pedwarn_c90 (loc
, OPT_Wpedantic
, "duplicate %<_Atomic%>");
5522 if (!ADDR_SPACE_GENERIC_P (as1
) && !ADDR_SPACE_GENERIC_P (as2
) && as1
!= as2
)
5523 error_at (loc
, "conflicting named address spaces (%s vs %s)",
5524 c_addr_space_name (as1
), c_addr_space_name (as2
));
5526 if ((TREE_CODE (type
) == ARRAY_TYPE
5527 || first_non_attr_kind
== cdk_array
)
5528 && TYPE_QUALS (element_type
))
5529 type
= TYPE_MAIN_VARIANT (type
);
5530 type_quals
= ((constp
? TYPE_QUAL_CONST
: 0)
5531 | (restrictp
? TYPE_QUAL_RESTRICT
: 0)
5532 | (volatilep
? TYPE_QUAL_VOLATILE
: 0)
5533 | (atomicp
? TYPE_QUAL_ATOMIC
: 0)
5534 | ENCODE_QUAL_ADDR_SPACE (address_space
));
5536 /* Applying the _Atomic qualifier to an array type (through the use
5537 of typedefs or typeof) must be detected here. If the qualifier
5538 is introduced later, any appearance of applying it to an array is
5539 actually applying it to an element of that array. */
5540 if (atomicp
&& TREE_CODE (type
) == ARRAY_TYPE
)
5541 error_at (loc
, "%<_Atomic%>-qualified array type");
5543 /* Warn about storage classes that are invalid for certain
5544 kinds of declarations (parameters, typenames, etc.). */
5548 || storage_class
== csc_auto
5549 || storage_class
== csc_register
5550 || storage_class
== csc_typedef
))
5552 if (storage_class
== csc_auto
)
5554 (current_scope
== file_scope
) ? 0 : OPT_Wpedantic
,
5555 "function definition declared %<auto%>");
5556 if (storage_class
== csc_register
)
5557 error_at (loc
, "function definition declared %<register%>");
5558 if (storage_class
== csc_typedef
)
5559 error_at (loc
, "function definition declared %<typedef%>");
5561 error_at (loc
, "function definition declared %qs",
5562 declspecs
->thread_gnu_p
? "__thread" : "_Thread_local");
5564 if (storage_class
== csc_auto
5565 || storage_class
== csc_register
5566 || storage_class
== csc_typedef
)
5567 storage_class
= csc_none
;
5569 else if (decl_context
!= NORMAL
&& (storage_class
!= csc_none
|| threadp
))
5571 if (decl_context
== PARM
&& storage_class
== csc_register
)
5575 switch (decl_context
)
5579 error_at (loc
, "storage class specified for structure "
5582 error_at (loc
, "storage class specified for structure field");
5586 error_at (loc
, "storage class specified for parameter %qE",
5589 error_at (loc
, "storage class specified for unnamed parameter");
5592 error_at (loc
, "storage class specified for typename");
5595 storage_class
= csc_none
;
5599 else if (storage_class
== csc_extern
5603 /* 'extern' with initialization is invalid if not at file scope. */
5604 if (current_scope
== file_scope
)
5606 /* It is fine to have 'extern const' when compiling at C
5607 and C++ intersection. */
5608 if (!(warn_cxx_compat
&& constp
))
5609 warning_at (loc
, 0, "%qE initialized and declared %<extern%>",
5613 error_at (loc
, "%qE has both %<extern%> and initializer", name
);
5615 else if (current_scope
== file_scope
)
5617 if (storage_class
== csc_auto
)
5618 error_at (loc
, "file-scope declaration of %qE specifies %<auto%>",
5620 if (pedantic
&& storage_class
== csc_register
)
5621 pedwarn (input_location
, OPT_Wpedantic
,
5622 "file-scope declaration of %qE specifies %<register%>", name
);
5626 if (storage_class
== csc_extern
&& funcdef_flag
)
5627 error_at (loc
, "nested function %qE declared %<extern%>", name
);
5628 else if (threadp
&& storage_class
== csc_none
)
5630 error_at (loc
, "function-scope %qE implicitly auto and declared "
5632 declspecs
->thread_gnu_p
? "__thread" : "_Thread_local");
5637 /* Now figure out the structure of the declarator proper.
5638 Descend through it, creating more complex types, until we reach
5639 the declared identifier (or NULL_TREE, in an absolute declarator).
5640 At each stage we maintain an unqualified version of the type
5641 together with any qualifiers that should be applied to it with
5642 c_build_qualified_type; this way, array types including
5643 multidimensional array types are first built up in unqualified
5644 form and then the qualified form is created with
5645 TYPE_MAIN_VARIANT pointing to the unqualified form. */
5647 while (declarator
&& declarator
->kind
!= cdk_id
)
5649 if (type
== error_mark_node
)
5651 declarator
= declarator
->declarator
;
5655 /* Each level of DECLARATOR is either a cdk_array (for ...[..]),
5656 a cdk_pointer (for *...),
5657 a cdk_function (for ...(...)),
5658 a cdk_attrs (for nested attributes),
5659 or a cdk_id (for the name being declared
5660 or the place in an absolute declarator
5661 where the name was omitted).
5662 For the last case, we have just exited the loop.
5664 At this point, TYPE is the type of elements of an array,
5665 or for a function to return, or for a pointer to point to.
5666 After this sequence of ifs, TYPE is the type of the
5667 array or function or pointer, and DECLARATOR has had its
5668 outermost layer removed. */
5670 if (array_ptr_quals
!= TYPE_UNQUALIFIED
5671 || array_ptr_attrs
!= NULL_TREE
5672 || array_parm_static
)
5674 /* Only the innermost declarator (making a parameter be of
5675 array type which is converted to pointer type)
5676 may have static or type qualifiers. */
5677 error_at (loc
, "static or type qualifiers in non-parameter array declarator");
5678 array_ptr_quals
= TYPE_UNQUALIFIED
;
5679 array_ptr_attrs
= NULL_TREE
;
5680 array_parm_static
= 0;
5683 switch (declarator
->kind
)
5687 /* A declarator with embedded attributes. */
5688 tree attrs
= declarator
->u
.attrs
;
5689 const struct c_declarator
*inner_decl
;
5691 declarator
= declarator
->declarator
;
5692 inner_decl
= declarator
;
5693 while (inner_decl
->kind
== cdk_attrs
)
5694 inner_decl
= inner_decl
->declarator
;
5695 if (inner_decl
->kind
== cdk_id
)
5696 attr_flags
|= (int) ATTR_FLAG_DECL_NEXT
;
5697 else if (inner_decl
->kind
== cdk_function
)
5698 attr_flags
|= (int) ATTR_FLAG_FUNCTION_NEXT
;
5699 else if (inner_decl
->kind
== cdk_array
)
5700 attr_flags
|= (int) ATTR_FLAG_ARRAY_NEXT
;
5701 returned_attrs
= decl_attributes (&type
,
5702 chainon (returned_attrs
, attrs
),
5708 tree itype
= NULL_TREE
;
5709 tree size
= declarator
->u
.array
.dimen
;
5710 /* The index is a signed object `sizetype' bits wide. */
5711 tree index_type
= c_common_signed_type (sizetype
);
5713 array_ptr_quals
= declarator
->u
.array
.quals
;
5714 array_ptr_attrs
= declarator
->u
.array
.attrs
;
5715 array_parm_static
= declarator
->u
.array
.static_p
;
5716 array_parm_vla_unspec_p
= declarator
->u
.array
.vla_unspec_p
;
5718 declarator
= declarator
->declarator
;
5720 /* Check for some types that there cannot be arrays of. */
5722 if (VOID_TYPE_P (type
))
5725 error_at (loc
, "declaration of %qE as array of voids", name
);
5727 error_at (loc
, "declaration of type name as array of voids");
5728 type
= error_mark_node
;
5731 if (TREE_CODE (type
) == FUNCTION_TYPE
)
5734 error_at (loc
, "declaration of %qE as array of functions",
5737 error_at (loc
, "declaration of type name as array of "
5739 type
= error_mark_node
;
5742 if (pedantic
&& !in_system_header_at (input_location
)
5743 && flexible_array_type_p (type
))
5744 pedwarn (loc
, OPT_Wpedantic
,
5745 "invalid use of structure with flexible array member");
5747 if (size
== error_mark_node
)
5748 type
= error_mark_node
;
5750 if (type
== error_mark_node
)
5753 /* If size was specified, set ITYPE to a range-type for
5754 that size. Otherwise, ITYPE remains null. finish_decl
5755 may figure it out from an initial value. */
5759 bool size_maybe_const
= true;
5760 bool size_int_const
= (TREE_CODE (size
) == INTEGER_CST
5761 && !TREE_OVERFLOW (size
));
5762 bool this_size_varies
= false;
5764 /* Strip NON_LVALUE_EXPRs since we aren't using as an
5766 STRIP_TYPE_NOPS (size
);
5768 if (!INTEGRAL_TYPE_P (TREE_TYPE (size
)))
5771 error_at (loc
, "size of array %qE has non-integer type",
5775 "size of unnamed array has non-integer type");
5776 size
= integer_one_node
;
5779 size
= c_fully_fold (size
, false, &size_maybe_const
);
5781 if (pedantic
&& size_maybe_const
&& integer_zerop (size
))
5784 pedwarn (loc
, OPT_Wpedantic
,
5785 "ISO C forbids zero-size array %qE", name
);
5787 pedwarn (loc
, OPT_Wpedantic
,
5788 "ISO C forbids zero-size array");
5791 if (TREE_CODE (size
) == INTEGER_CST
&& size_maybe_const
)
5793 constant_expression_warning (size
);
5794 if (tree_int_cst_sgn (size
) < 0)
5797 error_at (loc
, "size of array %qE is negative", name
);
5799 error_at (loc
, "size of unnamed array is negative");
5800 size
= integer_one_node
;
5802 /* Handle a size folded to an integer constant but
5803 not an integer constant expression. */
5804 if (!size_int_const
)
5806 /* If this is a file scope declaration of an
5807 ordinary identifier, this is invalid code;
5808 diagnosing it here and not subsequently
5809 treating the type as variable-length avoids
5810 more confusing diagnostics later. */
5811 if ((decl_context
== NORMAL
|| decl_context
== FIELD
)
5812 && current_scope
== file_scope
)
5813 pedwarn (input_location
, 0,
5814 "variably modified %qE at file scope",
5817 this_size_varies
= size_varies
= true;
5818 warn_variable_length_array (name
, size
);
5821 else if ((decl_context
== NORMAL
|| decl_context
== FIELD
)
5822 && current_scope
== file_scope
)
5824 error_at (loc
, "variably modified %qE at file scope", name
);
5825 size
= integer_one_node
;
5829 /* Make sure the array size remains visibly
5830 nonconstant even if it is (eg) a const variable
5831 with known value. */
5832 this_size_varies
= size_varies
= true;
5833 warn_variable_length_array (name
, size
);
5834 if (flag_sanitize
& SANITIZE_VLA
5835 && decl_context
== NORMAL
5836 && do_ubsan_in_current_function ())
5838 /* Evaluate the array size only once. */
5839 size
= c_save_expr (size
);
5840 size
= c_fully_fold (size
, false, NULL
);
5841 size
= fold_build2 (COMPOUND_EXPR
, TREE_TYPE (size
),
5842 ubsan_instrument_vla (loc
, size
),
5847 if (integer_zerop (size
) && !this_size_varies
)
5849 /* A zero-length array cannot be represented with
5850 an unsigned index type, which is what we'll
5851 get with build_index_type. Create an
5852 open-ended range instead. */
5853 itype
= build_range_type (sizetype
, size
, NULL_TREE
);
5857 /* Arrange for the SAVE_EXPR on the inside of the
5858 MINUS_EXPR, which allows the -1 to get folded
5859 with the +1 that happens when building TYPE_SIZE. */
5861 size
= save_expr (size
);
5862 if (this_size_varies
&& TREE_CODE (size
) == INTEGER_CST
)
5863 size
= build2 (COMPOUND_EXPR
, TREE_TYPE (size
),
5864 integer_zero_node
, size
);
5866 /* Compute the maximum valid index, that is, size
5867 - 1. Do the calculation in index_type, so that
5868 if it is a variable the computations will be
5869 done in the proper mode. */
5870 itype
= fold_build2_loc (loc
, MINUS_EXPR
, index_type
,
5871 convert (index_type
, size
),
5872 convert (index_type
,
5875 /* The above overflows when size does not fit
5877 ??? While a size of INT_MAX+1 technically shouldn't
5878 cause an overflow (because we subtract 1), handling
5879 this case seems like an unnecessary complication. */
5880 if (TREE_CODE (size
) == INTEGER_CST
5881 && !int_fits_type_p (size
, index_type
))
5884 error_at (loc
, "size of array %qE is too large",
5887 error_at (loc
, "size of unnamed array is too large");
5888 type
= error_mark_node
;
5892 itype
= build_index_type (itype
);
5894 if (this_size_varies
)
5897 *expr
= build2 (COMPOUND_EXPR
, TREE_TYPE (size
),
5901 *expr_const_operands
&= size_maybe_const
;
5904 else if (decl_context
== FIELD
)
5906 bool flexible_array_member
= false;
5907 if (array_parm_vla_unspec_p
)
5908 /* Field names can in fact have function prototype
5909 scope so [*] is disallowed here through making
5910 the field variably modified, not through being
5911 something other than a declaration with function
5916 const struct c_declarator
*t
= declarator
;
5917 while (t
->kind
== cdk_attrs
)
5919 flexible_array_member
= (t
->kind
== cdk_id
);
5921 if (flexible_array_member
5922 && !in_system_header_at (input_location
))
5923 pedwarn_c90 (loc
, OPT_Wpedantic
, "ISO C90 does not "
5924 "support flexible array members");
5926 /* ISO C99 Flexible array members are effectively
5927 identical to GCC's zero-length array extension. */
5928 if (flexible_array_member
|| array_parm_vla_unspec_p
)
5929 itype
= build_range_type (sizetype
, size_zero_node
,
5932 else if (decl_context
== PARM
)
5934 if (array_parm_vla_unspec_p
)
5936 itype
= build_range_type (sizetype
, size_zero_node
, NULL_TREE
);
5940 else if (decl_context
== TYPENAME
)
5942 if (array_parm_vla_unspec_p
)
5945 warning (0, "%<[*]%> not in a declaration");
5946 /* We use this to avoid messing up with incomplete
5947 array types of the same type, that would
5948 otherwise be modified below. */
5949 itype
= build_range_type (sizetype
, size_zero_node
,
5955 /* Complain about arrays of incomplete types. */
5956 if (!COMPLETE_TYPE_P (type
))
5958 error_at (loc
, "array type has incomplete element type %qT",
5960 type
= error_mark_node
;
5963 /* When itype is NULL, a shared incomplete array type is
5964 returned for all array of a given type. Elsewhere we
5965 make sure we don't complete that type before copying
5966 it, but here we want to make sure we don't ever
5967 modify the shared type, so we gcc_assert (itype)
5970 addr_space_t as
= DECODE_QUAL_ADDR_SPACE (type_quals
);
5971 if (!ADDR_SPACE_GENERIC_P (as
) && as
!= TYPE_ADDR_SPACE (type
))
5972 type
= build_qualified_type (type
,
5973 ENCODE_QUAL_ADDR_SPACE (as
));
5975 type
= build_array_type (type
, itype
);
5978 if (type
!= error_mark_node
)
5982 /* It is ok to modify type here even if itype is
5983 NULL: if size_varies, we're in a
5984 multi-dimensional array and the inner type has
5985 variable size, so the enclosing shared array type
5987 if (size
&& TREE_CODE (size
) == INTEGER_CST
)
5989 = build_distinct_type_copy (TYPE_MAIN_VARIANT (type
));
5990 C_TYPE_VARIABLE_SIZE (type
) = 1;
5993 /* The GCC extension for zero-length arrays differs from
5994 ISO flexible array members in that sizeof yields
5996 if (size
&& integer_zerop (size
))
5999 type
= build_distinct_type_copy (TYPE_MAIN_VARIANT (type
));
6000 TYPE_SIZE (type
) = bitsize_zero_node
;
6001 TYPE_SIZE_UNIT (type
) = size_zero_node
;
6002 SET_TYPE_STRUCTURAL_EQUALITY (type
);
6004 if (array_parm_vla_unspec_p
)
6007 /* The type is complete. C99 6.7.5.2p4 */
6008 type
= build_distinct_type_copy (TYPE_MAIN_VARIANT (type
));
6009 TYPE_SIZE (type
) = bitsize_zero_node
;
6010 TYPE_SIZE_UNIT (type
) = size_zero_node
;
6011 SET_TYPE_STRUCTURAL_EQUALITY (type
);
6015 if (decl_context
!= PARM
6016 && (array_ptr_quals
!= TYPE_UNQUALIFIED
6017 || array_ptr_attrs
!= NULL_TREE
6018 || array_parm_static
))
6020 error_at (loc
, "static or type qualifiers in non-parameter array declarator");
6021 array_ptr_quals
= TYPE_UNQUALIFIED
;
6022 array_ptr_attrs
= NULL_TREE
;
6023 array_parm_static
= 0;
6029 /* Say it's a definition only for the declarator closest
6030 to the identifier, apart possibly from some
6032 bool really_funcdef
= false;
6036 const struct c_declarator
*t
= declarator
->declarator
;
6037 while (t
->kind
== cdk_attrs
)
6039 really_funcdef
= (t
->kind
== cdk_id
);
6042 /* Declaring a function type. Make sure we have a valid
6043 type for the function to return. */
6044 if (type
== error_mark_node
)
6047 size_varies
= false;
6049 /* Warn about some types functions can't return. */
6050 if (TREE_CODE (type
) == FUNCTION_TYPE
)
6053 error_at (loc
, "%qE declared as function returning a "
6056 error_at (loc
, "type name declared as function "
6057 "returning a function");
6058 type
= integer_type_node
;
6060 if (TREE_CODE (type
) == ARRAY_TYPE
)
6063 error_at (loc
, "%qE declared as function returning an array",
6066 error_at (loc
, "type name declared as function returning "
6068 type
= integer_type_node
;
6070 errmsg
= targetm
.invalid_return_type (type
);
6074 type
= integer_type_node
;
6077 /* Construct the function type and go to the next
6078 inner layer of declarator. */
6079 arg_info
= declarator
->u
.arg_info
;
6080 arg_types
= grokparms (arg_info
, really_funcdef
);
6082 /* Type qualifiers before the return type of the function
6083 qualify the return type, not the function type. */
6086 /* Type qualifiers on a function return type are
6087 normally permitted by the standard but have no
6088 effect, so give a warning at -Wreturn-type.
6089 Qualifiers on a void return type are banned on
6090 function definitions in ISO C; GCC used to used
6091 them for noreturn functions. */
6092 if (VOID_TYPE_P (type
) && really_funcdef
)
6094 "function definition has qualified void return type");
6096 warning_at (loc
, OPT_Wignored_qualifiers
,
6097 "type qualifiers ignored on function return type");
6099 type
= c_build_qualified_type (type
, type_quals
);
6101 type_quals
= TYPE_UNQUALIFIED
;
6103 type
= build_function_type (type
, arg_types
);
6104 declarator
= declarator
->declarator
;
6106 /* Set the TYPE_CONTEXTs for each tagged type which is local to
6107 the formal parameter list of this FUNCTION_TYPE to point to
6108 the FUNCTION_TYPE node itself. */
6113 FOR_EACH_VEC_SAFE_ELT_REVERSE (arg_info
->tags
, ix
, tag
)
6114 TYPE_CONTEXT (tag
->type
) = type
;
6120 /* Merge any constancy or volatility into the target type
6122 if ((type_quals
& TYPE_QUAL_ATOMIC
)
6123 && TREE_CODE (type
) == FUNCTION_TYPE
)
6126 "%<_Atomic%>-qualified function type");
6127 type_quals
&= ~TYPE_QUAL_ATOMIC
;
6129 else if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
6131 pedwarn (loc
, OPT_Wpedantic
,
6132 "ISO C forbids qualified function types");
6134 type
= c_build_qualified_type (type
, type_quals
);
6135 size_varies
= false;
6137 /* When the pointed-to type involves components of variable size,
6138 care must be taken to ensure that the size evaluation code is
6139 emitted early enough to dominate all the possible later uses
6140 and late enough for the variables on which it depends to have
6143 This is expected to happen automatically when the pointed-to
6144 type has a name/declaration of it's own, but special attention
6145 is required if the type is anonymous.
6147 We handle the NORMAL and FIELD contexts here by attaching an
6148 artificial TYPE_DECL to such pointed-to type. This forces the
6149 sizes evaluation at a safe point and ensures it is not deferred
6150 until e.g. within a deeper conditional context.
6152 We expect nothing to be needed here for PARM or TYPENAME.
6153 Pushing a TYPE_DECL at this point for TYPENAME would actually
6154 be incorrect, as we might be in the middle of an expression
6155 with side effects on the pointed-to type size "arguments" prior
6156 to the pointer declaration point and the fake TYPE_DECL in the
6157 enclosing context would force the size evaluation prior to the
6160 if (!TYPE_NAME (type
)
6161 && (decl_context
== NORMAL
|| decl_context
== FIELD
)
6162 && variably_modified_type_p (type
, NULL_TREE
))
6164 tree decl
= build_decl (loc
, TYPE_DECL
, NULL_TREE
, type
);
6165 DECL_ARTIFICIAL (decl
) = 1;
6167 finish_decl (decl
, loc
, NULL_TREE
, NULL_TREE
, NULL_TREE
);
6168 TYPE_NAME (type
) = decl
;
6171 type
= c_build_pointer_type (type
);
6173 /* Process type qualifiers (such as const or volatile)
6174 that were given inside the `*'. */
6175 type_quals
= declarator
->u
.pointer_quals
;
6177 declarator
= declarator
->declarator
;
6184 *decl_attrs
= chainon (returned_attrs
, *decl_attrs
);
6186 /* Now TYPE has the actual type, apart from any qualifiers in
6189 /* Warn about address space used for things other than static memory or
6191 address_space
= DECODE_QUAL_ADDR_SPACE (type_quals
);
6192 if (!ADDR_SPACE_GENERIC_P (address_space
))
6194 if (decl_context
== NORMAL
)
6196 switch (storage_class
)
6199 error ("%qs combined with %<auto%> qualifier for %qE",
6200 c_addr_space_name (address_space
), name
);
6203 error ("%qs combined with %<register%> qualifier for %qE",
6204 c_addr_space_name (address_space
), name
);
6207 if (current_function_scope
)
6209 error ("%qs specified for auto variable %qE",
6210 c_addr_space_name (address_space
), name
);
6222 else if (decl_context
== PARM
&& TREE_CODE (type
) != ARRAY_TYPE
)
6225 error ("%qs specified for parameter %qE",
6226 c_addr_space_name (address_space
), name
);
6228 error ("%qs specified for unnamed parameter",
6229 c_addr_space_name (address_space
));
6231 else if (decl_context
== FIELD
)
6234 error ("%qs specified for structure field %qE",
6235 c_addr_space_name (address_space
), name
);
6237 error ("%qs specified for structure field",
6238 c_addr_space_name (address_space
));
6242 /* Check the type and width of a bit-field. */
6245 check_bitfield_type_and_width (&type
, width
, name
);
6246 /* C11 makes it implementation-defined (6.7.2.1#5) whether
6247 atomic types are permitted for bit-fields; we have no code to
6248 make bit-field accesses atomic, so disallow them. */
6249 if (type_quals
& TYPE_QUAL_ATOMIC
)
6252 error ("bit-field %qE has atomic type", name
);
6254 error ("bit-field has atomic type");
6255 type_quals
&= ~TYPE_QUAL_ATOMIC
;
6259 /* Reject invalid uses of _Alignas. */
6260 if (declspecs
->alignas_p
)
6262 if (storage_class
== csc_typedef
)
6263 error_at (loc
, "alignment specified for typedef %qE", name
);
6264 else if (storage_class
== csc_register
)
6265 error_at (loc
, "alignment specified for %<register%> object %qE",
6267 else if (decl_context
== PARM
)
6270 error_at (loc
, "alignment specified for parameter %qE", name
);
6272 error_at (loc
, "alignment specified for unnamed parameter");
6277 error_at (loc
, "alignment specified for bit-field %qE", name
);
6279 error_at (loc
, "alignment specified for unnamed bit-field");
6281 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
6282 error_at (loc
, "alignment specified for function %qE", name
);
6283 else if (declspecs
->align_log
!= -1)
6285 alignas_align
= 1U << declspecs
->align_log
;
6286 if (alignas_align
< min_align_of_type (type
))
6289 error_at (loc
, "%<_Alignas%> specifiers cannot reduce "
6290 "alignment of %qE", name
);
6292 error_at (loc
, "%<_Alignas%> specifiers cannot reduce "
6293 "alignment of unnamed field");
6299 /* Did array size calculations overflow or does the array cover more
6300 than half of the address-space? */
6301 if (TREE_CODE (type
) == ARRAY_TYPE
6302 && COMPLETE_TYPE_P (type
)
6303 && TREE_CODE (TYPE_SIZE_UNIT (type
)) == INTEGER_CST
6304 && ! valid_constant_size_p (TYPE_SIZE_UNIT (type
)))
6307 error_at (loc
, "size of array %qE is too large", name
);
6309 error_at (loc
, "size of unnamed array is too large");
6310 /* If we proceed with the array type as it is, we'll eventually
6311 crash in tree_to_[su]hwi(). */
6312 type
= error_mark_node
;
6315 /* If this is declaring a typedef name, return a TYPE_DECL. */
6317 if (storage_class
== csc_typedef
)
6320 if ((type_quals
& TYPE_QUAL_ATOMIC
)
6321 && TREE_CODE (type
) == FUNCTION_TYPE
)
6324 "%<_Atomic%>-qualified function type");
6325 type_quals
&= ~TYPE_QUAL_ATOMIC
;
6327 else if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
6329 pedwarn (loc
, OPT_Wpedantic
,
6330 "ISO C forbids qualified function types");
6332 type
= c_build_qualified_type (type
, type_quals
);
6333 decl
= build_decl (declarator
->id_loc
,
6334 TYPE_DECL
, declarator
->u
.id
, type
);
6335 if (declspecs
->explicit_signed_p
)
6336 C_TYPEDEF_EXPLICITLY_SIGNED (decl
) = 1;
6337 if (declspecs
->inline_p
)
6338 pedwarn (loc
, 0,"typedef %q+D declared %<inline%>", decl
);
6339 if (declspecs
->noreturn_p
)
6340 pedwarn (loc
, 0,"typedef %q+D declared %<_Noreturn%>", decl
);
6342 if (warn_cxx_compat
&& declarator
->u
.id
!= NULL_TREE
)
6344 struct c_binding
*b
= I_TAG_BINDING (declarator
->u
.id
);
6347 && b
->decl
!= NULL_TREE
6348 && (B_IN_CURRENT_SCOPE (b
)
6349 || (current_scope
== file_scope
&& B_IN_EXTERNAL_SCOPE (b
)))
6350 && TYPE_MAIN_VARIANT (b
->decl
) != TYPE_MAIN_VARIANT (type
))
6352 warning_at (declarator
->id_loc
, OPT_Wc___compat
,
6353 ("using %qD as both a typedef and a tag is "
6356 if (b
->locus
!= UNKNOWN_LOCATION
)
6357 inform (b
->locus
, "originally defined here");
6364 /* If this is a type name (such as, in a cast or sizeof),
6365 compute the type and return it now. */
6367 if (decl_context
== TYPENAME
)
6369 /* Note that the grammar rejects storage classes in typenames
6371 gcc_assert (storage_class
== csc_none
&& !threadp
6372 && !declspecs
->inline_p
&& !declspecs
->noreturn_p
);
6373 if ((type_quals
& TYPE_QUAL_ATOMIC
)
6374 && TREE_CODE (type
) == FUNCTION_TYPE
)
6377 "%<_Atomic%>-qualified function type");
6378 type_quals
&= ~TYPE_QUAL_ATOMIC
;
6380 else if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
6382 pedwarn (loc
, OPT_Wpedantic
,
6383 "ISO C forbids const or volatile function types");
6385 type
= c_build_qualified_type (type
, type_quals
);
6389 if (pedantic
&& decl_context
== FIELD
6390 && variably_modified_type_p (type
, NULL_TREE
))
6393 pedwarn (loc
, OPT_Wpedantic
, "a member of a structure or union cannot "
6394 "have a variably modified type");
6397 /* Aside from typedefs and type names (handle above),
6398 `void' at top level (not within pointer)
6399 is allowed only in public variables.
6400 We don't complain about parms either, but that is because
6401 a better error message can be made later. */
6403 if (VOID_TYPE_P (type
) && decl_context
!= PARM
6404 && !((decl_context
!= FIELD
&& TREE_CODE (type
) != FUNCTION_TYPE
)
6405 && (storage_class
== csc_extern
6406 || (current_scope
== file_scope
6407 && !(storage_class
== csc_static
6408 || storage_class
== csc_register
)))))
6410 error_at (loc
, "variable or field %qE declared void", name
);
6411 type
= integer_type_node
;
6414 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
6415 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
6420 if (decl_context
== PARM
)
6423 bool array_parameter_p
= false;
6425 /* A parameter declared as an array of T is really a pointer to T.
6426 One declared as a function is really a pointer to a function. */
6428 if (TREE_CODE (type
) == ARRAY_TYPE
)
6430 /* Transfer const-ness of array into that of type pointed to. */
6431 type
= TREE_TYPE (type
);
6433 type
= c_build_qualified_type (type
, type_quals
);
6434 type
= c_build_pointer_type (type
);
6435 type_quals
= array_ptr_quals
;
6437 type
= c_build_qualified_type (type
, type_quals
);
6439 /* We don't yet implement attributes in this context. */
6440 if (array_ptr_attrs
!= NULL_TREE
)
6441 warning_at (loc
, OPT_Wattributes
,
6442 "attributes in parameter array declarator ignored");
6444 size_varies
= false;
6445 array_parameter_p
= true;
6447 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
6449 if (type_quals
& TYPE_QUAL_ATOMIC
)
6452 "%<_Atomic%>-qualified function type");
6453 type_quals
&= ~TYPE_QUAL_ATOMIC
;
6455 else if (type_quals
)
6456 pedwarn (loc
, OPT_Wpedantic
,
6457 "ISO C forbids qualified function types");
6459 type
= c_build_qualified_type (type
, type_quals
);
6460 type
= c_build_pointer_type (type
);
6461 type_quals
= TYPE_UNQUALIFIED
;
6463 else if (type_quals
)
6464 type
= c_build_qualified_type (type
, type_quals
);
6466 decl
= build_decl (declarator
->id_loc
,
6467 PARM_DECL
, declarator
->u
.id
, type
);
6469 C_DECL_VARIABLE_SIZE (decl
) = 1;
6470 C_ARRAY_PARAMETER (decl
) = array_parameter_p
;
6472 /* Compute the type actually passed in the parmlist,
6473 for the case where there is no prototype.
6474 (For example, shorts and chars are passed as ints.)
6475 When there is a prototype, this is overridden later. */
6477 if (type
== error_mark_node
)
6478 promoted_type
= type
;
6480 promoted_type
= c_type_promotes_to (type
);
6482 DECL_ARG_TYPE (decl
) = promoted_type
;
6483 if (declspecs
->inline_p
)
6484 pedwarn (loc
, 0, "parameter %q+D declared %<inline%>", decl
);
6485 if (declspecs
->noreturn_p
)
6486 pedwarn (loc
, 0, "parameter %q+D declared %<_Noreturn%>", decl
);
6488 else if (decl_context
== FIELD
)
6490 /* Note that the grammar rejects storage classes in typenames
6492 gcc_assert (storage_class
== csc_none
&& !threadp
6493 && !declspecs
->inline_p
&& !declspecs
->noreturn_p
);
6495 /* Structure field. It may not be a function. */
6497 if (TREE_CODE (type
) == FUNCTION_TYPE
)
6499 error_at (loc
, "field %qE declared as a function", name
);
6500 type
= build_pointer_type (type
);
6502 else if (TREE_CODE (type
) != ERROR_MARK
6503 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type
))
6506 error_at (loc
, "field %qE has incomplete type", name
);
6508 error_at (loc
, "unnamed field has incomplete type");
6509 type
= error_mark_node
;
6511 else if (TREE_CODE (type
) == ARRAY_TYPE
6512 && TYPE_DOMAIN (type
) == NULL_TREE
)
6514 /* We have a flexible array member through a typedef.
6515 Set suitable range. Whether this is a correct position
6516 for a flexible array member will be determined elsewhere. */
6517 if (!in_system_header_at (input_location
))
6518 pedwarn_c90 (loc
, OPT_Wpedantic
, "ISO C90 does not "
6519 "support flexible array members");
6520 type
= build_distinct_type_copy (TYPE_MAIN_VARIANT (type
));
6521 TYPE_DOMAIN (type
) = build_range_type (sizetype
, size_zero_node
,
6524 type
= c_build_qualified_type (type
, type_quals
);
6525 decl
= build_decl (declarator
->id_loc
,
6526 FIELD_DECL
, declarator
->u
.id
, type
);
6527 DECL_NONADDRESSABLE_P (decl
) = bitfield
;
6528 if (bitfield
&& !declarator
->u
.id
)
6529 TREE_NO_WARNING (decl
) = 1;
6532 C_DECL_VARIABLE_SIZE (decl
) = 1;
6534 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
6536 if (storage_class
== csc_register
|| threadp
)
6538 error_at (loc
, "invalid storage class for function %qE", name
);
6540 else if (current_scope
!= file_scope
)
6542 /* Function declaration not at file scope. Storage
6543 classes other than `extern' are not allowed, C99
6544 6.7.1p5, and `extern' makes no difference. However,
6545 GCC allows 'auto', perhaps with 'inline', to support
6546 nested functions. */
6547 if (storage_class
== csc_auto
)
6548 pedwarn (loc
, OPT_Wpedantic
,
6549 "invalid storage class for function %qE", name
);
6550 else if (storage_class
== csc_static
)
6552 error_at (loc
, "invalid storage class for function %qE", name
);
6554 storage_class
= declspecs
->storage_class
= csc_none
;
6560 decl
= build_decl (declarator
->id_loc
,
6561 FUNCTION_DECL
, declarator
->u
.id
, type
);
6562 decl
= build_decl_attribute_variant (decl
, decl_attr
);
6564 if (type_quals
& TYPE_QUAL_ATOMIC
)
6567 "%<_Atomic%>-qualified function type");
6568 type_quals
&= ~TYPE_QUAL_ATOMIC
;
6570 else if (pedantic
&& type_quals
&& !DECL_IN_SYSTEM_HEADER (decl
))
6571 pedwarn (loc
, OPT_Wpedantic
,
6572 "ISO C forbids qualified function types");
6574 /* Every function declaration is an external reference
6575 (DECL_EXTERNAL) except for those which are not at file
6576 scope and are explicitly declared "auto". This is
6577 forbidden by standard C (C99 6.7.1p5) and is interpreted by
6578 GCC to signify a forward declaration of a nested function. */
6579 if (storage_class
== csc_auto
&& current_scope
!= file_scope
)
6580 DECL_EXTERNAL (decl
) = 0;
6581 /* In C99, a function which is declared 'inline' with 'extern'
6582 is not an external reference (which is confusing). It
6583 means that the later definition of the function must be output
6584 in this file, C99 6.7.4p6. In GNU C89, a function declared
6585 'extern inline' is an external reference. */
6586 else if (declspecs
->inline_p
&& storage_class
!= csc_static
)
6587 DECL_EXTERNAL (decl
) = ((storage_class
== csc_extern
)
6588 == flag_gnu89_inline
);
6590 DECL_EXTERNAL (decl
) = !initialized
;
6592 /* Record absence of global scope for `static' or `auto'. */
6594 = !(storage_class
== csc_static
|| storage_class
== csc_auto
);
6596 /* For a function definition, record the argument information
6597 block where store_parm_decls will look for it. */
6599 current_function_arg_info
= arg_info
;
6601 if (declspecs
->default_int_p
)
6602 C_FUNCTION_IMPLICIT_INT (decl
) = 1;
6604 /* Record presence of `inline' and `_Noreturn', if it is
6606 if (flag_hosted
&& MAIN_NAME_P (declarator
->u
.id
))
6608 if (declspecs
->inline_p
)
6609 pedwarn (loc
, 0, "cannot inline function %<main%>");
6610 if (declspecs
->noreturn_p
)
6611 pedwarn (loc
, 0, "%<main%> declared %<_Noreturn%>");
6615 if (declspecs
->inline_p
)
6616 /* Record that the function is declared `inline'. */
6617 DECL_DECLARED_INLINE_P (decl
) = 1;
6618 if (declspecs
->noreturn_p
)
6621 pedwarn_c99 (loc
, OPT_Wpedantic
,
6622 "ISO C99 does not support %<_Noreturn%>");
6624 pedwarn_c99 (loc
, OPT_Wpedantic
,
6625 "ISO C90 does not support %<_Noreturn%>");
6626 TREE_THIS_VOLATILE (decl
) = 1;
6632 /* It's a variable. */
6633 /* An uninitialized decl with `extern' is a reference. */
6634 int extern_ref
= !initialized
&& storage_class
== csc_extern
;
6636 type
= c_build_qualified_type (type
, type_quals
);
6638 /* C99 6.2.2p7: It is invalid (compile-time undefined
6639 behavior) to create an 'extern' declaration for a
6640 variable if there is a global declaration that is
6641 'static' and the global declaration is not visible.
6642 (If the static declaration _is_ currently visible,
6643 the 'extern' declaration is taken to refer to that decl.) */
6644 if (extern_ref
&& current_scope
!= file_scope
)
6646 tree global_decl
= identifier_global_value (declarator
->u
.id
);
6647 tree visible_decl
= lookup_name (declarator
->u
.id
);
6650 && global_decl
!= visible_decl
6651 && TREE_CODE (global_decl
) == VAR_DECL
6652 && !TREE_PUBLIC (global_decl
))
6653 error_at (loc
, "variable previously declared %<static%> "
6654 "redeclared %<extern%>");
6657 decl
= build_decl (declarator
->id_loc
,
6658 VAR_DECL
, declarator
->u
.id
, type
);
6660 C_DECL_VARIABLE_SIZE (decl
) = 1;
6662 if (declspecs
->inline_p
)
6663 pedwarn (loc
, 0, "variable %q+D declared %<inline%>", decl
);
6664 if (declspecs
->noreturn_p
)
6665 pedwarn (loc
, 0, "variable %q+D declared %<_Noreturn%>", decl
);
6667 /* At file scope, an initialized extern declaration may follow
6668 a static declaration. In that case, DECL_EXTERNAL will be
6669 reset later in start_decl. */
6670 DECL_EXTERNAL (decl
) = (storage_class
== csc_extern
);
6672 /* At file scope, the presence of a `static' or `register' storage
6673 class specifier, or the absence of all storage class specifiers
6674 makes this declaration a definition (perhaps tentative). Also,
6675 the absence of `static' makes it public. */
6676 if (current_scope
== file_scope
)
6678 TREE_PUBLIC (decl
) = storage_class
!= csc_static
;
6679 TREE_STATIC (decl
) = !extern_ref
;
6681 /* Not at file scope, only `static' makes a static definition. */
6684 TREE_STATIC (decl
) = (storage_class
== csc_static
);
6685 TREE_PUBLIC (decl
) = extern_ref
;
6689 set_decl_tls_model (decl
, decl_default_tls_model (decl
));
6692 if ((storage_class
== csc_extern
6693 || (storage_class
== csc_none
6694 && TREE_CODE (type
) == FUNCTION_TYPE
6696 && variably_modified_type_p (type
, NULL_TREE
))
6699 if (TREE_CODE (type
) == FUNCTION_TYPE
)
6700 error_at (loc
, "non-nested function with variably modified type");
6702 error_at (loc
, "object with variably modified type must have "
6706 /* Record `register' declaration for warnings on &
6707 and in case doing stupid register allocation. */
6709 if (storage_class
== csc_register
)
6711 C_DECL_REGISTER (decl
) = 1;
6712 DECL_REGISTER (decl
) = 1;
6715 /* Record constancy and volatility. */
6716 c_apply_type_quals_to_decl (type_quals
, decl
);
6718 /* Apply _Alignas specifiers. */
6721 DECL_ALIGN (decl
) = alignas_align
* BITS_PER_UNIT
;
6722 DECL_USER_ALIGN (decl
) = 1;
6725 /* If a type has volatile components, it should be stored in memory.
6726 Otherwise, the fact that those components are volatile
6727 will be ignored, and would even crash the compiler.
6728 Of course, this only makes sense on VAR,PARM, and RESULT decl's. */
6729 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl
))
6730 && (TREE_CODE (decl
) == VAR_DECL
|| TREE_CODE (decl
) == PARM_DECL
6731 || TREE_CODE (decl
) == RESULT_DECL
))
6733 /* It is not an error for a structure with volatile fields to
6734 be declared register, but reset DECL_REGISTER since it
6735 cannot actually go in a register. */
6736 int was_reg
= C_DECL_REGISTER (decl
);
6737 C_DECL_REGISTER (decl
) = 0;
6738 DECL_REGISTER (decl
) = 0;
6739 c_mark_addressable (decl
);
6740 C_DECL_REGISTER (decl
) = was_reg
;
6743 /* This is the earliest point at which we might know the assembler
6744 name of a variable. Thus, if it's known before this, die horribly. */
6745 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl
));
6748 && TREE_CODE (decl
) == VAR_DECL
6749 && TREE_PUBLIC (decl
)
6750 && TREE_STATIC (decl
)
6751 && (TREE_CODE (TREE_TYPE (decl
)) == RECORD_TYPE
6752 || TREE_CODE (TREE_TYPE (decl
)) == UNION_TYPE
6753 || TREE_CODE (TREE_TYPE (decl
)) == ENUMERAL_TYPE
)
6754 && TYPE_NAME (TREE_TYPE (decl
)) == NULL_TREE
)
6755 warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wc___compat
,
6756 ("non-local variable %qD with anonymous type is "
6757 "questionable in C++"),
6764 /* Decode the parameter-list info for a function type or function definition.
6765 The argument is the value returned by `get_parm_info' (or made in c-parse.c
6766 if there is an identifier list instead of a parameter decl list).
6767 These two functions are separate because when a function returns
6768 or receives functions then each is called multiple times but the order
6769 of calls is different. The last call to `grokparms' is always the one
6770 that contains the formal parameter names of a function definition.
6772 Return a list of arg types to use in the FUNCTION_TYPE for this function.
6774 FUNCDEF_FLAG is true for a function definition, false for
6775 a mere declaration. A nonempty identifier-list gets an error message
6776 when FUNCDEF_FLAG is false. */
6779 grokparms (struct c_arg_info
*arg_info
, bool funcdef_flag
)
6781 tree arg_types
= arg_info
->types
;
6783 if (funcdef_flag
&& arg_info
->had_vla_unspec
)
6785 /* A function definition isn't function prototype scope C99 6.2.1p4. */
6787 error ("%<[*]%> not allowed in other than function prototype scope");
6790 if (arg_types
== 0 && !funcdef_flag
6791 && !in_system_header_at (input_location
))
6792 warning (OPT_Wstrict_prototypes
,
6793 "function declaration isn%'t a prototype");
6795 if (arg_types
== error_mark_node
)
6796 return 0; /* don't set TYPE_ARG_TYPES in this case */
6798 else if (arg_types
&& TREE_CODE (TREE_VALUE (arg_types
)) == IDENTIFIER_NODE
)
6802 pedwarn (input_location
, 0, "parameter names (without types) in function declaration");
6803 arg_info
->parms
= NULL_TREE
;
6806 arg_info
->parms
= arg_info
->types
;
6808 arg_info
->types
= 0;
6813 tree parm
, type
, typelt
;
6814 unsigned int parmno
;
6817 /* If there is a parameter of incomplete type in a definition,
6818 this is an error. In a declaration this is valid, and a
6819 struct or union type may be completed later, before any calls
6820 or definition of the function. In the case where the tag was
6821 first declared within the parameter list, a warning has
6822 already been given. If a parameter has void type, then
6823 however the function cannot be defined or called, so
6826 for (parm
= arg_info
->parms
, typelt
= arg_types
, parmno
= 1;
6828 parm
= DECL_CHAIN (parm
), typelt
= TREE_CHAIN (typelt
), parmno
++)
6830 type
= TREE_VALUE (typelt
);
6831 if (type
== error_mark_node
)
6834 if (!COMPLETE_TYPE_P (type
))
6838 if (DECL_NAME (parm
))
6839 error_at (input_location
,
6840 "parameter %u (%q+D) has incomplete type",
6843 error_at (DECL_SOURCE_LOCATION (parm
),
6844 "parameter %u has incomplete type",
6847 TREE_VALUE (typelt
) = error_mark_node
;
6848 TREE_TYPE (parm
) = error_mark_node
;
6849 arg_types
= NULL_TREE
;
6851 else if (VOID_TYPE_P (type
))
6853 if (DECL_NAME (parm
))
6854 warning_at (input_location
, 0,
6855 "parameter %u (%q+D) has void type",
6858 warning_at (DECL_SOURCE_LOCATION (parm
), 0,
6859 "parameter %u has void type",
6864 errmsg
= targetm
.invalid_parameter_type (type
);
6868 TREE_VALUE (typelt
) = error_mark_node
;
6869 TREE_TYPE (parm
) = error_mark_node
;
6870 arg_types
= NULL_TREE
;
6873 if (DECL_NAME (parm
) && TREE_USED (parm
))
6874 warn_if_shadowing (parm
);
6880 /* Allocate and initialize a c_arg_info structure from the parser's
6884 build_arg_info (void)
6886 struct c_arg_info
*ret
= XOBNEW (&parser_obstack
, struct c_arg_info
);
6887 ret
->parms
= NULL_TREE
;
6889 ret
->types
= NULL_TREE
;
6890 ret
->others
= NULL_TREE
;
6891 ret
->pending_sizes
= NULL
;
6892 ret
->had_vla_unspec
= 0;
6896 /* Take apart the current scope and return a c_arg_info structure with
6897 info on a parameter list just parsed.
6899 This structure is later fed to 'grokparms' and 'store_parm_decls'.
6901 ELLIPSIS being true means the argument list ended in '...' so don't
6902 append a sentinel (void_list_node) to the end of the type-list.
6904 EXPR is NULL or an expression that needs to be evaluated for the
6905 side effects of array size expressions in the parameters. */
6908 get_parm_info (bool ellipsis
, tree expr
)
6910 struct c_binding
*b
= current_scope
->bindings
;
6911 struct c_arg_info
*arg_info
= build_arg_info ();
6914 vec
<c_arg_tag
, va_gc
> *tags
= NULL
;
6918 static bool explained_incomplete_types
= false;
6919 bool gave_void_only_once_err
= false;
6921 arg_info
->had_vla_unspec
= current_scope
->had_vla_unspec
;
6923 /* The bindings in this scope must not get put into a block.
6924 We will take care of deleting the binding nodes. */
6925 current_scope
->bindings
= 0;
6927 /* This function is only called if there was *something* on the
6931 /* A parameter list consisting solely of 'void' indicates that the
6932 function takes no arguments. But if the 'void' is qualified
6933 (by 'const' or 'volatile'), or has a storage class specifier
6934 ('register'), then the behavior is undefined; issue an error.
6935 Typedefs for 'void' are OK (see DR#157). */
6936 if (b
->prev
== 0 /* one binding */
6937 && TREE_CODE (b
->decl
) == PARM_DECL
/* which is a parameter */
6938 && !DECL_NAME (b
->decl
) /* anonymous */
6939 && VOID_TYPE_P (TREE_TYPE (b
->decl
))) /* of void type */
6941 if (TYPE_QUALS (TREE_TYPE (b
->decl
)) != TYPE_UNQUALIFIED
6942 || C_DECL_REGISTER (b
->decl
))
6943 error ("%<void%> as only parameter may not be qualified");
6945 /* There cannot be an ellipsis. */
6947 error ("%<void%> must be the only parameter");
6949 arg_info
->types
= void_list_node
;
6954 types
= void_list_node
;
6956 /* Break up the bindings list into parms, tags, types, and others;
6957 apply sanity checks; purge the name-to-decl bindings. */
6960 tree decl
= b
->decl
;
6961 tree type
= TREE_TYPE (decl
);
6963 const char *keyword
;
6965 switch (TREE_CODE (decl
))
6970 gcc_assert (I_SYMBOL_BINDING (b
->id
) == b
);
6971 I_SYMBOL_BINDING (b
->id
) = b
->shadowed
;
6974 /* Check for forward decls that never got their actual decl. */
6975 if (TREE_ASM_WRITTEN (decl
))
6976 error ("parameter %q+D has just a forward declaration", decl
);
6977 /* Check for (..., void, ...) and issue an error. */
6978 else if (VOID_TYPE_P (type
) && !DECL_NAME (decl
))
6980 if (!gave_void_only_once_err
)
6982 error ("%<void%> must be the only parameter");
6983 gave_void_only_once_err
= true;
6988 /* Valid parameter, add it to the list. */
6989 DECL_CHAIN (decl
) = parms
;
6992 /* Since there is a prototype, args are passed in their
6993 declared types. The back end may override this later. */
6994 DECL_ARG_TYPE (decl
) = type
;
6995 types
= tree_cons (0, type
, types
);
6999 case ENUMERAL_TYPE
: keyword
= "enum"; goto tag
;
7000 case UNION_TYPE
: keyword
= "union"; goto tag
;
7001 case RECORD_TYPE
: keyword
= "struct"; goto tag
;
7003 /* Types may not have tag-names, in which case the type
7004 appears in the bindings list with b->id NULL. */
7007 gcc_assert (I_TAG_BINDING (b
->id
) == b
);
7008 I_TAG_BINDING (b
->id
) = b
->shadowed
;
7011 /* Warn about any struct, union or enum tags defined in a
7012 parameter list. The scope of such types is limited to
7013 the parameter list, which is rarely if ever desirable
7014 (it's impossible to call such a function with type-
7015 correct arguments). An anonymous union parm type is
7016 meaningful as a GNU extension, so don't warn for that. */
7017 if (TREE_CODE (decl
) != UNION_TYPE
|| b
->id
!= 0)
7020 /* The %s will be one of 'struct', 'union', or 'enum'. */
7021 warning (0, "%<%s %E%> declared inside parameter list",
7024 /* The %s will be one of 'struct', 'union', or 'enum'. */
7025 warning (0, "anonymous %s declared inside parameter list",
7028 if (!explained_incomplete_types
)
7030 warning (0, "its scope is only this definition or declaration,"
7031 " which is probably not what you want");
7032 explained_incomplete_types
= true;
7038 vec_safe_push (tags
, tag
);
7044 /* CONST_DECLs appear here when we have an embedded enum,
7045 and TYPE_DECLs appear here when we have an embedded struct
7046 or union. No warnings for this - we already warned about the
7047 type itself. FUNCTION_DECLs appear when there is an implicit
7048 function declaration in the parameter list. */
7050 /* When we reinsert this decl in the function body, we need
7051 to reconstruct whether it was marked as nested. */
7052 gcc_assert (TREE_CODE (decl
) == FUNCTION_DECL
7055 DECL_CHAIN (decl
) = others
;
7060 /* error_mark_node appears here when we have an undeclared
7061 variable. Just throw it away. */
7064 gcc_assert (I_SYMBOL_BINDING (b
->id
) == b
);
7065 I_SYMBOL_BINDING (b
->id
) = b
->shadowed
;
7069 /* Other things that might be encountered. */
7076 b
= free_binding_and_advance (b
);
7079 arg_info
->parms
= parms
;
7080 arg_info
->tags
= tags
;
7081 arg_info
->types
= types
;
7082 arg_info
->others
= others
;
7083 arg_info
->pending_sizes
= expr
;
7087 /* Get the struct, enum or union (CODE says which) with tag NAME.
7088 Define the tag as a forward-reference with location LOC if it is
7089 not defined. Return a c_typespec structure for the type
7093 parser_xref_tag (location_t loc
, enum tree_code code
, tree name
)
7095 struct c_typespec ret
;
7099 ret
.expr
= NULL_TREE
;
7100 ret
.expr_const_operands
= true;
7102 /* If a cross reference is requested, look up the type
7103 already defined for this tag and return it. */
7105 ref
= lookup_tag (code
, name
, 0, &refloc
);
7106 /* If this is the right type of tag, return what we found.
7107 (This reference will be shadowed by shadow_tag later if appropriate.)
7108 If this is the wrong type of tag, do not return it. If it was the
7109 wrong type in the same scope, we will have had an error
7110 message already; if in a different scope and declaring
7111 a name, pending_xref_error will give an error message; but if in a
7112 different scope and not declaring a name, this tag should
7113 shadow the previous declaration of a different type of tag, and
7114 this would not work properly if we return the reference found.
7115 (For example, with "struct foo" in an outer scope, "union foo;"
7116 must shadow that tag with a new one of union type.) */
7117 ret
.kind
= (ref
? ctsk_tagref
: ctsk_tagfirstref
);
7118 if (ref
&& TREE_CODE (ref
) == code
)
7120 if (C_TYPE_DEFINED_IN_STRUCT (ref
)
7121 && loc
!= UNKNOWN_LOCATION
7127 warning_at (loc
, OPT_Wc___compat
,
7128 ("enum type defined in struct or union "
7129 "is not visible in C++"));
7130 inform (refloc
, "enum type defined here");
7133 warning_at (loc
, OPT_Wc___compat
,
7134 ("struct defined in struct or union "
7135 "is not visible in C++"));
7136 inform (refloc
, "struct defined here");
7139 warning_at (loc
, OPT_Wc___compat
,
7140 ("union defined in struct or union "
7141 "is not visible in C++"));
7142 inform (refloc
, "union defined here");
7153 /* If no such tag is yet defined, create a forward-reference node
7154 and record it as the "definition".
7155 When a real declaration of this type is found,
7156 the forward-reference will be altered into a real type. */
7158 ref
= make_node (code
);
7159 if (code
== ENUMERAL_TYPE
)
7161 /* Give the type a default layout like unsigned int
7162 to avoid crashing if it does not get defined. */
7163 SET_TYPE_MODE (ref
, TYPE_MODE (unsigned_type_node
));
7164 TYPE_ALIGN (ref
) = TYPE_ALIGN (unsigned_type_node
);
7165 TYPE_USER_ALIGN (ref
) = 0;
7166 TYPE_UNSIGNED (ref
) = 1;
7167 TYPE_PRECISION (ref
) = TYPE_PRECISION (unsigned_type_node
);
7168 TYPE_MIN_VALUE (ref
) = TYPE_MIN_VALUE (unsigned_type_node
);
7169 TYPE_MAX_VALUE (ref
) = TYPE_MAX_VALUE (unsigned_type_node
);
7172 pushtag (loc
, name
, ref
);
7178 /* Get the struct, enum or union (CODE says which) with tag NAME.
7179 Define the tag as a forward-reference if it is not defined.
7180 Return a tree for the type. */
7183 xref_tag (enum tree_code code
, tree name
)
7185 return parser_xref_tag (input_location
, code
, name
).spec
;
7188 /* Make sure that the tag NAME is defined *in the current scope*
7189 at least as a forward reference.
7190 LOC is the location of the struct's definition.
7191 CODE says which kind of tag NAME ought to be.
7193 This stores the current value of the file static STRUCT_PARSE_INFO
7194 in *ENCLOSING_STRUCT_PARSE_INFO, and points STRUCT_PARSE_INFO at a
7195 new c_struct_parse_info structure. The old value of
7196 STRUCT_PARSE_INFO is restored in finish_struct. */
7199 start_struct (location_t loc
, enum tree_code code
, tree name
,
7200 struct c_struct_parse_info
**enclosing_struct_parse_info
)
7202 /* If there is already a tag defined at this scope
7203 (as a forward reference), just return it. */
7205 tree ref
= NULL_TREE
;
7206 location_t refloc
= UNKNOWN_LOCATION
;
7208 if (name
!= NULL_TREE
)
7209 ref
= lookup_tag (code
, name
, 1, &refloc
);
7210 if (ref
&& TREE_CODE (ref
) == code
)
7212 if (TYPE_SIZE (ref
))
7214 if (code
== UNION_TYPE
)
7215 error_at (loc
, "redefinition of %<union %E%>", name
);
7217 error_at (loc
, "redefinition of %<struct %E%>", name
);
7218 if (refloc
!= UNKNOWN_LOCATION
)
7219 inform (refloc
, "originally defined here");
7220 /* Don't create structures using a name already in use. */
7223 else if (C_TYPE_BEING_DEFINED (ref
))
7225 if (code
== UNION_TYPE
)
7226 error_at (loc
, "nested redefinition of %<union %E%>", name
);
7228 error_at (loc
, "nested redefinition of %<struct %E%>", name
);
7229 /* Don't bother to report "originally defined here" for a
7230 nested redefinition; the original definition should be
7232 /* Don't create structures that contain themselves. */
7237 /* Otherwise create a forward-reference just so the tag is in scope. */
7239 if (ref
== NULL_TREE
|| TREE_CODE (ref
) != code
)
7241 ref
= make_node (code
);
7242 pushtag (loc
, name
, ref
);
7245 C_TYPE_BEING_DEFINED (ref
) = 1;
7246 TYPE_PACKED (ref
) = flag_pack_struct
;
7248 *enclosing_struct_parse_info
= struct_parse_info
;
7249 struct_parse_info
= XNEW (struct c_struct_parse_info
);
7250 struct_parse_info
->struct_types
.create (0);
7251 struct_parse_info
->fields
.create (0);
7252 struct_parse_info
->typedefs_seen
.create (0);
7254 /* FIXME: This will issue a warning for a use of a type defined
7255 within a statement expr used within sizeof, et. al. This is not
7256 terribly serious as C++ doesn't permit statement exprs within
7258 if (warn_cxx_compat
&& (in_sizeof
|| in_typeof
|| in_alignof
))
7259 warning_at (loc
, OPT_Wc___compat
,
7260 "defining type in %qs expression is invalid in C++",
7263 : (in_typeof
? "typeof" : "alignof")));
7268 /* Process the specs, declarator and width (NULL if omitted)
7269 of a structure component, returning a FIELD_DECL node.
7270 WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node.
7271 DECL_ATTRS is as for grokdeclarator.
7273 LOC is the location of the structure component.
7275 This is done during the parsing of the struct declaration.
7276 The FIELD_DECL nodes are chained together and the lot of them
7277 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
7280 grokfield (location_t loc
,
7281 struct c_declarator
*declarator
, struct c_declspecs
*declspecs
,
7282 tree width
, tree
*decl_attrs
)
7286 if (declarator
->kind
== cdk_id
&& declarator
->u
.id
== NULL_TREE
7287 && width
== NULL_TREE
)
7289 /* This is an unnamed decl.
7291 If we have something of the form "union { list } ;" then this
7292 is the anonymous union extension. Similarly for struct.
7294 If this is something of the form "struct foo;", then
7295 If MS or Plan 9 extensions are enabled, this is handled as
7296 an anonymous struct.
7297 Otherwise this is a forward declaration of a structure tag.
7299 If this is something of the form "foo;" and foo is a TYPE_DECL, then
7300 If foo names a structure or union without a tag, then this
7301 is an anonymous struct (this is permitted by C11).
7302 If MS or Plan 9 extensions are enabled and foo names a
7303 structure, then again this is an anonymous struct.
7304 Otherwise this is an error.
7306 Oh what a horrid tangled web we weave. I wonder if MS consciously
7307 took this from Plan 9 or if it was an accident of implementation
7308 that took root before someone noticed the bug... */
7310 tree type
= declspecs
->type
;
7311 bool type_ok
= (TREE_CODE (type
) == RECORD_TYPE
7312 || TREE_CODE (type
) == UNION_TYPE
);
7316 && (flag_ms_extensions
7317 || flag_plan9_extensions
7318 || !declspecs
->typedef_p
))
7320 if (flag_ms_extensions
|| flag_plan9_extensions
)
7322 else if (TYPE_NAME (type
) == NULL
)
7329 pedwarn (loc
, 0, "declaration does not declare anything");
7333 pedwarn_c99 (loc
, OPT_Wpedantic
,
7334 "ISO C99 doesn%'t support unnamed structs/unions");
7336 pedwarn_c99 (loc
, OPT_Wpedantic
,
7337 "ISO C90 doesn%'t support unnamed structs/unions");
7340 value
= grokdeclarator (declarator
, declspecs
, FIELD
, false,
7341 width
? &width
: NULL
, decl_attrs
, NULL
, NULL
,
7344 finish_decl (value
, loc
, NULL_TREE
, NULL_TREE
, NULL_TREE
);
7345 DECL_INITIAL (value
) = width
;
7347 if (warn_cxx_compat
&& DECL_NAME (value
) != NULL_TREE
)
7349 /* If we currently have a binding for this field, set the
7350 in_struct field in the binding, so that we warn about lookups
7352 struct c_binding
*b
= I_SYMBOL_BINDING (DECL_NAME (value
));
7355 /* If the in_struct field is not yet set, push it on a list
7356 to be cleared when this struct is finished. */
7359 struct_parse_info
->fields
.safe_push (b
);
7368 /* Subroutine of detect_field_duplicates: return whether X and Y,
7369 which are both fields in the same struct, have duplicate field
7373 is_duplicate_field (tree x
, tree y
)
7375 if (DECL_NAME (x
) != NULL_TREE
&& DECL_NAME (x
) == DECL_NAME (y
))
7378 /* When using -fplan9-extensions, an anonymous field whose name is a
7379 typedef can duplicate a field name. */
7380 if (flag_plan9_extensions
7381 && (DECL_NAME (x
) == NULL_TREE
|| DECL_NAME (y
) == NULL_TREE
))
7383 tree xt
, xn
, yt
, yn
;
7386 if (DECL_NAME (x
) != NULL_TREE
)
7388 else if ((TREE_CODE (xt
) == RECORD_TYPE
|| TREE_CODE (xt
) == UNION_TYPE
)
7389 && TYPE_NAME (xt
) != NULL_TREE
7390 && TREE_CODE (TYPE_NAME (xt
)) == TYPE_DECL
)
7391 xn
= DECL_NAME (TYPE_NAME (xt
));
7396 if (DECL_NAME (y
) != NULL_TREE
)
7398 else if ((TREE_CODE (yt
) == RECORD_TYPE
|| TREE_CODE (yt
) == UNION_TYPE
)
7399 && TYPE_NAME (yt
) != NULL_TREE
7400 && TREE_CODE (TYPE_NAME (yt
)) == TYPE_DECL
)
7401 yn
= DECL_NAME (TYPE_NAME (yt
));
7405 if (xn
!= NULL_TREE
&& xn
== yn
)
7412 /* Subroutine of detect_field_duplicates: add the fields of FIELDLIST
7413 to HTAB, giving errors for any duplicates. */
7416 detect_field_duplicates_hash (tree fieldlist
,
7417 hash_table
<pointer_hash
<tree_node
> > *htab
)
7422 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
7423 if ((y
= DECL_NAME (x
)) != 0)
7425 slot
= htab
->find_slot (y
, INSERT
);
7428 error ("duplicate member %q+D", x
);
7429 DECL_NAME (x
) = NULL_TREE
;
7433 else if (TREE_CODE (TREE_TYPE (x
)) == RECORD_TYPE
7434 || TREE_CODE (TREE_TYPE (x
)) == UNION_TYPE
)
7436 detect_field_duplicates_hash (TYPE_FIELDS (TREE_TYPE (x
)), htab
);
7438 /* When using -fplan9-extensions, an anonymous field whose
7439 name is a typedef can duplicate a field name. */
7440 if (flag_plan9_extensions
7441 && TYPE_NAME (TREE_TYPE (x
)) != NULL_TREE
7442 && TREE_CODE (TYPE_NAME (TREE_TYPE (x
))) == TYPE_DECL
)
7444 tree xn
= DECL_NAME (TYPE_NAME (TREE_TYPE (x
)));
7445 slot
= htab
->find_slot (xn
, INSERT
);
7447 error ("duplicate member %q+D", TYPE_NAME (TREE_TYPE (x
)));
7453 /* Generate an error for any duplicate field names in FIELDLIST. Munge
7454 the list such that this does not present a problem later. */
7457 detect_field_duplicates (tree fieldlist
)
7462 /* If the struct is the list of instance variables of an Objective-C
7463 class, then we need to check all the instance variables of
7464 superclasses when checking for duplicates (since you can't have
7465 an instance variable in a subclass with the same name as an
7466 instance variable in a superclass). We pass on this job to the
7467 Objective-C compiler. objc_detect_field_duplicates() will return
7468 false if we are not checking the list of instance variables and
7469 the C frontend should proceed with the standard field duplicate
7470 checks. If we are checking the list of instance variables, the
7471 ObjC frontend will do the check, emit the errors if needed, and
7472 then return true. */
7473 if (c_dialect_objc ())
7474 if (objc_detect_field_duplicates (false))
7477 /* First, see if there are more than "a few" fields.
7478 This is trivially true if there are zero or one fields. */
7479 if (!fieldlist
|| !DECL_CHAIN (fieldlist
))
7484 if (DECL_NAME (x
) == NULL_TREE
7485 && (TREE_CODE (TREE_TYPE (x
)) == RECORD_TYPE
7486 || TREE_CODE (TREE_TYPE (x
)) == UNION_TYPE
))
7489 } while (timeout
> 0 && x
);
7491 /* If there were "few" fields and no anonymous structures or unions,
7492 avoid the overhead of allocating a hash table. Instead just do
7493 the nested traversal thing. */
7496 for (x
= DECL_CHAIN (fieldlist
); x
; x
= DECL_CHAIN (x
))
7497 /* When using -fplan9-extensions, we can have duplicates
7498 between typedef names and fields. */
7500 || (flag_plan9_extensions
7501 && DECL_NAME (x
) == NULL_TREE
7502 && (TREE_CODE (TREE_TYPE (x
)) == RECORD_TYPE
7503 || TREE_CODE (TREE_TYPE (x
)) == UNION_TYPE
)
7504 && TYPE_NAME (TREE_TYPE (x
)) != NULL_TREE
7505 && TREE_CODE (TYPE_NAME (TREE_TYPE (x
))) == TYPE_DECL
))
7507 for (y
= fieldlist
; y
!= x
; y
= TREE_CHAIN (y
))
7508 if (is_duplicate_field (y
, x
))
7510 error ("duplicate member %q+D", x
);
7511 DECL_NAME (x
) = NULL_TREE
;
7517 hash_table
<pointer_hash
<tree_node
> > htab (37);
7518 detect_field_duplicates_hash (fieldlist
, &htab
);
7522 /* Finish up struct info used by -Wc++-compat. */
7525 warn_cxx_compat_finish_struct (tree fieldlist
, enum tree_code code
,
7526 location_t record_loc
)
7530 struct c_binding
*b
;
7532 if (fieldlist
== NULL_TREE
)
7534 if (code
== RECORD_TYPE
)
7535 warning_at (record_loc
, OPT_Wc___compat
,
7536 "empty struct has size 0 in C, size 1 in C++");
7538 warning_at (record_loc
, OPT_Wc___compat
,
7539 "empty union has size 0 in C, size 1 in C++");
7542 /* Set the C_TYPE_DEFINED_IN_STRUCT flag for each type defined in
7543 the current struct. We do this now at the end of the struct
7544 because the flag is used to issue visibility warnings, and we
7545 only want to issue those warnings if the type is referenced
7546 outside of the struct declaration. */
7547 FOR_EACH_VEC_ELT (struct_parse_info
->struct_types
, ix
, x
)
7548 C_TYPE_DEFINED_IN_STRUCT (x
) = 1;
7550 /* The TYPEDEFS_SEEN field of STRUCT_PARSE_INFO is a list of
7551 typedefs used when declaring fields in this struct. If the name
7552 of any of the fields is also a typedef name then the struct would
7553 not parse in C++, because the C++ lookup rules say that the
7554 typedef name would be looked up in the context of the struct, and
7555 would thus be the field rather than the typedef. */
7556 if (!struct_parse_info
->typedefs_seen
.is_empty ()
7557 && fieldlist
!= NULL_TREE
)
7559 /* Use a hash_set<tree> using the name of the typedef. We can use
7560 a hash_set<tree> because identifiers are interned. */
7561 hash_set
<tree
> tset
;
7563 FOR_EACH_VEC_ELT (struct_parse_info
->typedefs_seen
, ix
, x
)
7564 tset
.add (DECL_NAME (x
));
7566 for (x
= fieldlist
; x
!= NULL_TREE
; x
= DECL_CHAIN (x
))
7568 if (DECL_NAME (x
) != NULL_TREE
7569 && tset
.contains (DECL_NAME (x
)))
7571 warning_at (DECL_SOURCE_LOCATION (x
), OPT_Wc___compat
,
7572 ("using %qD as both field and typedef name is "
7575 /* FIXME: It would be nice to report the location where
7576 the typedef name is used. */
7581 /* For each field which has a binding and which was not defined in
7582 an enclosing struct, clear the in_struct field. */
7583 FOR_EACH_VEC_ELT (struct_parse_info
->fields
, ix
, b
)
7587 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
7588 LOC is the location of the RECORD_TYPE or UNION_TYPE's definition.
7589 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
7590 ATTRIBUTES are attributes to be applied to the structure.
7592 ENCLOSING_STRUCT_PARSE_INFO is the value of STRUCT_PARSE_INFO when
7593 the struct was started. */
7596 finish_struct (location_t loc
, tree t
, tree fieldlist
, tree attributes
,
7597 struct c_struct_parse_info
*enclosing_struct_parse_info
)
7600 bool toplevel
= file_scope
== current_scope
;
7601 int saw_named_field
;
7603 /* If this type was previously laid out as a forward reference,
7604 make sure we lay it out again. */
7608 decl_attributes (&t
, attributes
, (int) ATTR_FLAG_TYPE_IN_PLACE
);
7612 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
7614 if (DECL_NAME (x
) != 0)
7617 && (TREE_CODE (TREE_TYPE (x
)) == RECORD_TYPE
7618 || TREE_CODE (TREE_TYPE (x
)) == UNION_TYPE
))
7624 if (TREE_CODE (t
) == UNION_TYPE
)
7627 pedwarn (loc
, OPT_Wpedantic
, "union has no named members");
7629 pedwarn (loc
, OPT_Wpedantic
, "union has no members");
7634 pedwarn (loc
, OPT_Wpedantic
, "struct has no named members");
7636 pedwarn (loc
, OPT_Wpedantic
, "struct has no members");
7641 /* Install struct as DECL_CONTEXT of each field decl.
7642 Also process specified field sizes, found in the DECL_INITIAL,
7643 storing 0 there after the type has been changed to precision equal
7644 to its width, rather than the precision of the specified standard
7645 type. (Correct layout requires the original type to have been preserved
7648 saw_named_field
= 0;
7649 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
7651 if (TREE_TYPE (x
) == error_mark_node
)
7654 DECL_CONTEXT (x
) = t
;
7656 /* If any field is const, the structure type is pseudo-const. */
7657 if (TREE_READONLY (x
))
7658 C_TYPE_FIELDS_READONLY (t
) = 1;
7661 /* A field that is pseudo-const makes the structure likewise. */
7662 tree t1
= strip_array_types (TREE_TYPE (x
));
7663 if ((TREE_CODE (t1
) == RECORD_TYPE
|| TREE_CODE (t1
) == UNION_TYPE
)
7664 && C_TYPE_FIELDS_READONLY (t1
))
7665 C_TYPE_FIELDS_READONLY (t
) = 1;
7668 /* Any field that is volatile means variables of this type must be
7669 treated in some ways as volatile. */
7670 if (TREE_THIS_VOLATILE (x
))
7671 C_TYPE_FIELDS_VOLATILE (t
) = 1;
7673 /* Any field of nominal variable size implies structure is too. */
7674 if (C_DECL_VARIABLE_SIZE (x
))
7675 C_TYPE_VARIABLE_SIZE (t
) = 1;
7677 if (DECL_INITIAL (x
))
7679 unsigned HOST_WIDE_INT width
= tree_to_uhwi (DECL_INITIAL (x
));
7680 DECL_SIZE (x
) = bitsize_int (width
);
7681 DECL_BIT_FIELD (x
) = 1;
7682 SET_DECL_C_BIT_FIELD (x
);
7686 && (DECL_BIT_FIELD (x
)
7687 || TYPE_ALIGN (TREE_TYPE (x
)) > BITS_PER_UNIT
))
7688 DECL_PACKED (x
) = 1;
7690 /* Detect flexible array member in an invalid context. */
7691 if (TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
7692 && TYPE_SIZE (TREE_TYPE (x
)) == NULL_TREE
7693 && TYPE_DOMAIN (TREE_TYPE (x
)) != NULL_TREE
7694 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x
))) == NULL_TREE
)
7696 if (TREE_CODE (t
) == UNION_TYPE
)
7698 error_at (DECL_SOURCE_LOCATION (x
),
7699 "flexible array member in union");
7700 TREE_TYPE (x
) = error_mark_node
;
7702 else if (DECL_CHAIN (x
) != NULL_TREE
)
7704 error_at (DECL_SOURCE_LOCATION (x
),
7705 "flexible array member not at end of struct");
7706 TREE_TYPE (x
) = error_mark_node
;
7708 else if (!saw_named_field
)
7710 error_at (DECL_SOURCE_LOCATION (x
),
7711 "flexible array member in otherwise empty struct");
7712 TREE_TYPE (x
) = error_mark_node
;
7716 if (pedantic
&& TREE_CODE (t
) == RECORD_TYPE
7717 && flexible_array_type_p (TREE_TYPE (x
)))
7718 pedwarn (DECL_SOURCE_LOCATION (x
), OPT_Wpedantic
,
7719 "invalid use of structure with flexible array member");
7722 || TREE_CODE (TREE_TYPE (x
)) == RECORD_TYPE
7723 || TREE_CODE (TREE_TYPE (x
)) == UNION_TYPE
)
7724 saw_named_field
= 1;
7727 detect_field_duplicates (fieldlist
);
7729 /* Now we have the nearly final fieldlist. Record it,
7730 then lay out the structure or union (including the fields). */
7732 TYPE_FIELDS (t
) = fieldlist
;
7736 if (TYPE_SIZE_UNIT (t
)
7737 && TREE_CODE (TYPE_SIZE_UNIT (t
)) == INTEGER_CST
7738 && !TREE_OVERFLOW (TYPE_SIZE_UNIT (t
))
7739 && !valid_constant_size_p (TYPE_SIZE_UNIT (t
)))
7740 error ("type %qT is too large", t
);
7742 /* Give bit-fields their proper types. */
7744 tree
*fieldlistp
= &fieldlist
;
7746 if (TREE_CODE (*fieldlistp
) == FIELD_DECL
&& DECL_INITIAL (*fieldlistp
)
7747 && TREE_TYPE (*fieldlistp
) != error_mark_node
)
7749 unsigned HOST_WIDE_INT width
7750 = tree_to_uhwi (DECL_INITIAL (*fieldlistp
));
7751 tree type
= TREE_TYPE (*fieldlistp
);
7752 if (width
!= TYPE_PRECISION (type
))
7754 TREE_TYPE (*fieldlistp
)
7755 = c_build_bitfield_integer_type (width
, TYPE_UNSIGNED (type
));
7756 DECL_MODE (*fieldlistp
) = TYPE_MODE (TREE_TYPE (*fieldlistp
));
7758 DECL_INITIAL (*fieldlistp
) = 0;
7761 fieldlistp
= &DECL_CHAIN (*fieldlistp
);
7764 /* Now we have the truly final field list.
7765 Store it in this type and in the variants. */
7767 TYPE_FIELDS (t
) = fieldlist
;
7769 /* If there are lots of fields, sort so we can look through them fast.
7770 We arbitrarily consider 16 or more elts to be "a lot". */
7775 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
7777 if (len
> 15 || DECL_NAME (x
) == NULL
)
7785 struct lang_type
*space
;
7786 struct sorted_fields_type
*space2
;
7788 len
+= list_length (x
);
7790 /* Use the same allocation policy here that make_node uses, to
7791 ensure that this lives as long as the rest of the struct decl.
7792 All decls in an inline function need to be saved. */
7794 space
= ggc_cleared_alloc
<struct lang_type
> ();
7795 space2
= (sorted_fields_type
*) ggc_internal_alloc
7796 (sizeof (struct sorted_fields_type
) + len
* sizeof (tree
));
7800 field_array
= &space2
->elts
[0];
7801 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
7803 field_array
[len
++] = x
;
7805 /* If there is anonymous struct or union, break out of the loop. */
7806 if (DECL_NAME (x
) == NULL
)
7809 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
7812 TYPE_LANG_SPECIFIC (t
) = space
;
7813 TYPE_LANG_SPECIFIC (t
)->s
->len
= len
;
7814 field_array
= TYPE_LANG_SPECIFIC (t
)->s
->elts
;
7815 qsort (field_array
, len
, sizeof (tree
), field_decl_cmp
);
7820 for (x
= TYPE_MAIN_VARIANT (t
); x
; x
= TYPE_NEXT_VARIANT (x
))
7822 TYPE_FIELDS (x
) = TYPE_FIELDS (t
);
7823 TYPE_LANG_SPECIFIC (x
) = TYPE_LANG_SPECIFIC (t
);
7824 C_TYPE_FIELDS_READONLY (x
) = C_TYPE_FIELDS_READONLY (t
);
7825 C_TYPE_FIELDS_VOLATILE (x
) = C_TYPE_FIELDS_VOLATILE (t
);
7826 C_TYPE_VARIABLE_SIZE (x
) = C_TYPE_VARIABLE_SIZE (t
);
7829 /* If this was supposed to be a transparent union, but we can't
7830 make it one, warn and turn off the flag. */
7831 if (TREE_CODE (t
) == UNION_TYPE
7832 && TYPE_TRANSPARENT_AGGR (t
)
7833 && (!TYPE_FIELDS (t
) || TYPE_MODE (t
) != DECL_MODE (TYPE_FIELDS (t
))))
7835 TYPE_TRANSPARENT_AGGR (t
) = 0;
7836 warning_at (loc
, 0, "union cannot be made transparent");
7839 /* If this structure or union completes the type of any previous
7840 variable declaration, lay it out and output its rtl. */
7841 for (x
= C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t
));
7845 tree decl
= TREE_VALUE (x
);
7846 if (TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
)
7847 layout_array_type (TREE_TYPE (decl
));
7848 if (TREE_CODE (decl
) != TYPE_DECL
)
7850 layout_decl (decl
, 0);
7851 if (c_dialect_objc ())
7852 objc_check_decl (decl
);
7853 rest_of_decl_compilation (decl
, toplevel
, 0);
7856 C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t
)) = 0;
7858 /* Update type location to the one of the definition, instead of e.g.
7859 a forward declaration. */
7860 if (TYPE_STUB_DECL (t
))
7861 DECL_SOURCE_LOCATION (TYPE_STUB_DECL (t
)) = loc
;
7863 /* Finish debugging output for this type. */
7864 rest_of_type_compilation (t
, toplevel
);
7866 /* If we're inside a function proper, i.e. not file-scope and not still
7867 parsing parameters, then arrange for the size of a variable sized type
7869 if (building_stmt_list_p () && variably_modified_type_p (t
, NULL_TREE
))
7870 add_stmt (build_stmt (loc
,
7871 DECL_EXPR
, build_decl (loc
, TYPE_DECL
, NULL
, t
)));
7873 if (warn_cxx_compat
)
7874 warn_cxx_compat_finish_struct (fieldlist
, TREE_CODE (t
), loc
);
7876 struct_parse_info
->struct_types
.release ();
7877 struct_parse_info
->fields
.release ();
7878 struct_parse_info
->typedefs_seen
.release ();
7879 XDELETE (struct_parse_info
);
7881 struct_parse_info
= enclosing_struct_parse_info
;
7883 /* If this struct is defined inside a struct, add it to
7886 && struct_parse_info
!= NULL
7887 && !in_sizeof
&& !in_typeof
&& !in_alignof
)
7888 struct_parse_info
->struct_types
.safe_push (t
);
7893 /* Lay out the type T, and its element type, and so on. */
7896 layout_array_type (tree t
)
7898 if (TREE_CODE (TREE_TYPE (t
)) == ARRAY_TYPE
)
7899 layout_array_type (TREE_TYPE (t
));
7903 /* Begin compiling the definition of an enumeration type.
7904 NAME is its name (or null if anonymous).
7905 LOC is the enum's location.
7906 Returns the type object, as yet incomplete.
7907 Also records info about it so that build_enumerator
7908 may be used to declare the individual values as they are read. */
7911 start_enum (location_t loc
, struct c_enum_contents
*the_enum
, tree name
)
7913 tree enumtype
= NULL_TREE
;
7914 location_t enumloc
= UNKNOWN_LOCATION
;
7916 /* If this is the real definition for a previous forward reference,
7917 fill in the contents in the same object that used to be the
7918 forward reference. */
7920 if (name
!= NULL_TREE
)
7921 enumtype
= lookup_tag (ENUMERAL_TYPE
, name
, 1, &enumloc
);
7923 if (enumtype
== 0 || TREE_CODE (enumtype
) != ENUMERAL_TYPE
)
7925 enumtype
= make_node (ENUMERAL_TYPE
);
7926 pushtag (loc
, name
, enumtype
);
7929 if (C_TYPE_BEING_DEFINED (enumtype
))
7930 error_at (loc
, "nested redefinition of %<enum %E%>", name
);
7932 C_TYPE_BEING_DEFINED (enumtype
) = 1;
7934 if (TYPE_VALUES (enumtype
) != 0)
7936 /* This enum is a named one that has been declared already. */
7937 error_at (loc
, "redeclaration of %<enum %E%>", name
);
7938 if (enumloc
!= UNKNOWN_LOCATION
)
7939 inform (enumloc
, "originally defined here");
7941 /* Completely replace its old definition.
7942 The old enumerators remain defined, however. */
7943 TYPE_VALUES (enumtype
) = 0;
7946 the_enum
->enum_next_value
= integer_zero_node
;
7947 the_enum
->enum_overflow
= 0;
7949 if (flag_short_enums
)
7950 TYPE_PACKED (enumtype
) = 1;
7952 /* FIXME: This will issue a warning for a use of a type defined
7953 within sizeof in a statement expr. This is not terribly serious
7954 as C++ doesn't permit statement exprs within sizeof anyhow. */
7955 if (warn_cxx_compat
&& (in_sizeof
|| in_typeof
|| in_alignof
))
7956 warning_at (loc
, OPT_Wc___compat
,
7957 "defining type in %qs expression is invalid in C++",
7960 : (in_typeof
? "typeof" : "alignof")));
7965 /* After processing and defining all the values of an enumeration type,
7966 install their decls in the enumeration type and finish it off.
7967 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
7968 and ATTRIBUTES are the specified attributes.
7969 Returns ENUMTYPE. */
7972 finish_enum (tree enumtype
, tree values
, tree attributes
)
7975 tree minnode
= 0, maxnode
= 0;
7978 bool toplevel
= (file_scope
== current_scope
);
7979 struct lang_type
*lt
;
7981 decl_attributes (&enumtype
, attributes
, (int) ATTR_FLAG_TYPE_IN_PLACE
);
7983 /* Calculate the maximum value of any enumerator in this type. */
7985 if (values
== error_mark_node
)
7986 minnode
= maxnode
= integer_zero_node
;
7989 minnode
= maxnode
= TREE_VALUE (values
);
7990 for (pair
= TREE_CHAIN (values
); pair
; pair
= TREE_CHAIN (pair
))
7992 tree value
= TREE_VALUE (pair
);
7993 if (tree_int_cst_lt (maxnode
, value
))
7995 if (tree_int_cst_lt (value
, minnode
))
8000 /* Construct the final type of this enumeration. It is the same
8001 as one of the integral types - the narrowest one that fits, except
8002 that normally we only go as narrow as int - and signed iff any of
8003 the values are negative. */
8004 sign
= (tree_int_cst_sgn (minnode
) >= 0) ? UNSIGNED
: SIGNED
;
8005 precision
= MAX (tree_int_cst_min_precision (minnode
, sign
),
8006 tree_int_cst_min_precision (maxnode
, sign
));
8008 if (TYPE_PACKED (enumtype
) || precision
> TYPE_PRECISION (integer_type_node
))
8010 tem
= c_common_type_for_size (precision
, sign
== UNSIGNED
? 1 : 0);
8013 warning (0, "enumeration values exceed range of largest integer");
8014 tem
= long_long_integer_type_node
;
8018 tem
= sign
== UNSIGNED
? unsigned_type_node
: integer_type_node
;
8020 TYPE_MIN_VALUE (enumtype
) = TYPE_MIN_VALUE (tem
);
8021 TYPE_MAX_VALUE (enumtype
) = TYPE_MAX_VALUE (tem
);
8022 TYPE_UNSIGNED (enumtype
) = TYPE_UNSIGNED (tem
);
8023 TYPE_ALIGN (enumtype
) = TYPE_ALIGN (tem
);
8024 TYPE_SIZE (enumtype
) = 0;
8026 /* If the precision of the type was specified with an attribute and it
8027 was too small, give an error. Otherwise, use it. */
8028 if (TYPE_PRECISION (enumtype
)
8029 && lookup_attribute ("mode", attributes
))
8031 if (precision
> TYPE_PRECISION (enumtype
))
8032 error ("specified mode too small for enumeral values");
8035 TYPE_PRECISION (enumtype
) = TYPE_PRECISION (tem
);
8037 layout_type (enumtype
);
8039 if (values
!= error_mark_node
)
8041 /* Change the type of the enumerators to be the enum type. We
8042 need to do this irrespective of the size of the enum, for
8043 proper type checking. Replace the DECL_INITIALs of the
8044 enumerators, and the value slots of the list, with copies
8045 that have the enum type; they cannot be modified in place
8046 because they may be shared (e.g. integer_zero_node) Finally,
8047 change the purpose slots to point to the names of the decls. */
8048 for (pair
= values
; pair
; pair
= TREE_CHAIN (pair
))
8050 tree enu
= TREE_PURPOSE (pair
);
8051 tree ini
= DECL_INITIAL (enu
);
8053 TREE_TYPE (enu
) = enumtype
;
8055 /* The ISO C Standard mandates enumerators to have type int,
8056 even though the underlying type of an enum type is
8057 unspecified. However, GCC allows enumerators of any
8058 integer type as an extensions. build_enumerator()
8059 converts any enumerators that fit in an int to type int,
8060 to avoid promotions to unsigned types when comparing
8061 integers with enumerators that fit in the int range.
8062 When -pedantic is given, build_enumerator() would have
8063 already warned about those that don't fit. Here we
8064 convert the rest to the enumerator type. */
8065 if (TREE_TYPE (ini
) != integer_type_node
)
8066 ini
= convert (enumtype
, ini
);
8068 DECL_INITIAL (enu
) = ini
;
8069 TREE_PURPOSE (pair
) = DECL_NAME (enu
);
8070 TREE_VALUE (pair
) = ini
;
8073 TYPE_VALUES (enumtype
) = values
;
8076 /* Record the min/max values so that we can warn about bit-field
8077 enumerations that are too small for the values. */
8078 lt
= ggc_cleared_alloc
<struct lang_type
> ();
8079 lt
->enum_min
= minnode
;
8080 lt
->enum_max
= maxnode
;
8081 TYPE_LANG_SPECIFIC (enumtype
) = lt
;
8083 /* Fix up all variant types of this enum type. */
8084 for (tem
= TYPE_MAIN_VARIANT (enumtype
); tem
; tem
= TYPE_NEXT_VARIANT (tem
))
8086 if (tem
== enumtype
)
8088 TYPE_VALUES (tem
) = TYPE_VALUES (enumtype
);
8089 TYPE_MIN_VALUE (tem
) = TYPE_MIN_VALUE (enumtype
);
8090 TYPE_MAX_VALUE (tem
) = TYPE_MAX_VALUE (enumtype
);
8091 TYPE_SIZE (tem
) = TYPE_SIZE (enumtype
);
8092 TYPE_SIZE_UNIT (tem
) = TYPE_SIZE_UNIT (enumtype
);
8093 SET_TYPE_MODE (tem
, TYPE_MODE (enumtype
));
8094 TYPE_PRECISION (tem
) = TYPE_PRECISION (enumtype
);
8095 TYPE_ALIGN (tem
) = TYPE_ALIGN (enumtype
);
8096 TYPE_USER_ALIGN (tem
) = TYPE_USER_ALIGN (enumtype
);
8097 TYPE_UNSIGNED (tem
) = TYPE_UNSIGNED (enumtype
);
8098 TYPE_LANG_SPECIFIC (tem
) = TYPE_LANG_SPECIFIC (enumtype
);
8101 /* Finish debugging output for this type. */
8102 rest_of_type_compilation (enumtype
, toplevel
);
8104 /* If this enum is defined inside a struct, add it to
8107 && struct_parse_info
!= NULL
8108 && !in_sizeof
&& !in_typeof
&& !in_alignof
)
8109 struct_parse_info
->struct_types
.safe_push (enumtype
);
8114 /* Build and install a CONST_DECL for one value of the
8115 current enumeration type (one that was begun with start_enum).
8116 DECL_LOC is the location of the enumerator.
8117 LOC is the location of the '=' operator if any, DECL_LOC otherwise.
8118 Return a tree-list containing the CONST_DECL and its value.
8119 Assignment of sequential values by default is handled here. */
8122 build_enumerator (location_t decl_loc
, location_t loc
,
8123 struct c_enum_contents
*the_enum
, tree name
, tree value
)
8127 /* Validate and default VALUE. */
8131 /* Don't issue more errors for error_mark_node (i.e. an
8132 undeclared identifier) - just ignore the value expression. */
8133 if (value
== error_mark_node
)
8135 else if (!INTEGRAL_TYPE_P (TREE_TYPE (value
)))
8137 error_at (loc
, "enumerator value for %qE is not an integer constant",
8143 if (TREE_CODE (value
) != INTEGER_CST
)
8145 value
= c_fully_fold (value
, false, NULL
);
8146 if (TREE_CODE (value
) == INTEGER_CST
)
8147 pedwarn (loc
, OPT_Wpedantic
,
8148 "enumerator value for %qE is not an integer "
8149 "constant expression", name
);
8151 if (TREE_CODE (value
) != INTEGER_CST
)
8153 error ("enumerator value for %qE is not an integer constant",
8159 value
= default_conversion (value
);
8160 constant_expression_warning (value
);
8165 /* Default based on previous value. */
8166 /* It should no longer be possible to have NON_LVALUE_EXPR
8170 value
= the_enum
->enum_next_value
;
8171 if (the_enum
->enum_overflow
)
8172 error_at (loc
, "overflow in enumeration values");
8174 /* Even though the underlying type of an enum is unspecified, the
8175 type of enumeration constants is explicitly defined as int
8176 (6.4.4.3/2 in the C99 Standard). GCC allows any integer type as
8178 else if (!int_fits_type_p (value
, integer_type_node
))
8179 pedwarn (loc
, OPT_Wpedantic
,
8180 "ISO C restricts enumerator values to range of %<int%>");
8182 /* The ISO C Standard mandates enumerators to have type int, even
8183 though the underlying type of an enum type is unspecified.
8184 However, GCC allows enumerators of any integer type as an
8185 extensions. Here we convert any enumerators that fit in an int
8186 to type int, to avoid promotions to unsigned types when comparing
8187 integers with enumerators that fit in the int range. When
8188 -pedantic is given, we would have already warned about those that
8189 don't fit. We have to do this here rather than in finish_enum
8190 because this value may be used to define more enumerators. */
8191 if (int_fits_type_p (value
, integer_type_node
))
8192 value
= convert (integer_type_node
, value
);
8194 /* Set basis for default for next value. */
8195 the_enum
->enum_next_value
8196 = build_binary_op (EXPR_LOC_OR_LOC (value
, input_location
),
8197 PLUS_EXPR
, value
, integer_one_node
, 0);
8198 the_enum
->enum_overflow
= tree_int_cst_lt (the_enum
->enum_next_value
, value
);
8200 /* Now create a declaration for the enum value name. */
8202 type
= TREE_TYPE (value
);
8203 type
= c_common_type_for_size (MAX (TYPE_PRECISION (type
),
8204 TYPE_PRECISION (integer_type_node
)),
8205 (TYPE_PRECISION (type
)
8206 >= TYPE_PRECISION (integer_type_node
)
8207 && TYPE_UNSIGNED (type
)));
8209 decl
= build_decl (decl_loc
, CONST_DECL
, name
, type
);
8210 DECL_INITIAL (decl
) = convert (type
, value
);
8213 return tree_cons (decl
, value
, NULL_TREE
);
8217 /* Create the FUNCTION_DECL for a function definition.
8218 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
8219 the declaration; they describe the function's name and the type it returns,
8220 but twisted together in a fashion that parallels the syntax of C.
8222 This function creates a binding context for the function body
8223 as well as setting up the FUNCTION_DECL in current_function_decl.
8225 Returns 1 on success. If the DECLARATOR is not suitable for a function
8226 (it defines a datum instead), we return 0, which tells
8227 yyparse to report a parse error. */
8230 start_function (struct c_declspecs
*declspecs
, struct c_declarator
*declarator
,
8233 tree decl1
, old_decl
;
8234 tree restype
, resdecl
;
8237 current_function_returns_value
= 0; /* Assume, until we see it does. */
8238 current_function_returns_null
= 0;
8239 current_function_returns_abnormally
= 0;
8240 warn_about_return_type
= 0;
8241 c_switch_stack
= NULL
;
8243 /* Indicate no valid break/continue context by setting these variables
8244 to some non-null, non-label value. We'll notice and emit the proper
8245 error message in c_finish_bc_stmt. */
8246 c_break_label
= c_cont_label
= size_zero_node
;
8248 decl1
= grokdeclarator (declarator
, declspecs
, FUNCDEF
, true, NULL
,
8249 &attributes
, NULL
, NULL
, DEPRECATED_NORMAL
);
8250 invoke_plugin_callbacks (PLUGIN_START_PARSE_FUNCTION
, decl1
);
8252 /* If the declarator is not suitable for a function definition,
8253 cause a syntax error. */
8255 || TREE_CODE (decl1
) != FUNCTION_DECL
)
8258 loc
= DECL_SOURCE_LOCATION (decl1
);
8260 c_decl_attributes (&decl1
, attributes
, 0);
8262 if (DECL_DECLARED_INLINE_P (decl1
)
8263 && DECL_UNINLINABLE (decl1
)
8264 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1
)))
8265 warning_at (loc
, OPT_Wattributes
,
8266 "inline function %qD given attribute noinline",
8269 /* Handle gnu_inline attribute. */
8270 if (declspecs
->inline_p
8271 && !flag_gnu89_inline
8272 && TREE_CODE (decl1
) == FUNCTION_DECL
8273 && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl1
))
8274 || current_function_decl
))
8276 if (declspecs
->storage_class
!= csc_static
)
8277 DECL_EXTERNAL (decl1
) = !DECL_EXTERNAL (decl1
);
8280 announce_function (decl1
);
8282 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1
))))
8284 error_at (loc
, "return type is an incomplete type");
8285 /* Make it return void instead. */
8287 = build_function_type (void_type_node
,
8288 TYPE_ARG_TYPES (TREE_TYPE (decl1
)));
8291 if (warn_about_return_type
)
8292 warn_defaults_to (loc
, flag_isoc99
? OPT_Wimplicit_int
8293 : (warn_return_type
? OPT_Wreturn_type
8294 : OPT_Wimplicit_int
),
8295 "return type defaults to %<int%>");
8297 /* Make the init_value nonzero so pushdecl knows this is not tentative.
8298 error_mark_node is replaced below (in pop_scope) with the BLOCK. */
8299 DECL_INITIAL (decl1
) = error_mark_node
;
8301 /* A nested function is not global. */
8302 if (current_function_decl
!= 0)
8303 TREE_PUBLIC (decl1
) = 0;
8305 /* If this definition isn't a prototype and we had a prototype declaration
8306 before, copy the arg type info from that prototype. */
8307 old_decl
= lookup_name_in_scope (DECL_NAME (decl1
), current_scope
);
8308 if (old_decl
&& TREE_CODE (old_decl
) != FUNCTION_DECL
)
8310 current_function_prototype_locus
= UNKNOWN_LOCATION
;
8311 current_function_prototype_built_in
= false;
8312 current_function_prototype_arg_types
= NULL_TREE
;
8313 if (!prototype_p (TREE_TYPE (decl1
)))
8315 if (old_decl
!= 0 && TREE_CODE (TREE_TYPE (old_decl
)) == FUNCTION_TYPE
8316 && comptypes (TREE_TYPE (TREE_TYPE (decl1
)),
8317 TREE_TYPE (TREE_TYPE (old_decl
))))
8319 TREE_TYPE (decl1
) = composite_type (TREE_TYPE (old_decl
),
8321 current_function_prototype_locus
= DECL_SOURCE_LOCATION (old_decl
);
8322 current_function_prototype_built_in
8323 = C_DECL_BUILTIN_PROTOTYPE (old_decl
);
8324 current_function_prototype_arg_types
8325 = TYPE_ARG_TYPES (TREE_TYPE (decl1
));
8327 if (TREE_PUBLIC (decl1
))
8329 /* If there is an external prototype declaration of this
8330 function, record its location but do not copy information
8331 to this decl. This may be an invisible declaration
8332 (built-in or in a scope which has finished) or simply
8333 have more refined argument types than any declaration
8335 struct c_binding
*b
;
8336 for (b
= I_SYMBOL_BINDING (DECL_NAME (decl1
)); b
; b
= b
->shadowed
)
8337 if (B_IN_SCOPE (b
, external_scope
))
8341 tree ext_decl
, ext_type
;
8343 ext_type
= b
->u
.type
? b
->u
.type
: TREE_TYPE (ext_decl
);
8344 if (TREE_CODE (ext_type
) == FUNCTION_TYPE
8345 && comptypes (TREE_TYPE (TREE_TYPE (decl1
)),
8346 TREE_TYPE (ext_type
)))
8348 current_function_prototype_locus
8349 = DECL_SOURCE_LOCATION (ext_decl
);
8350 current_function_prototype_built_in
8351 = C_DECL_BUILTIN_PROTOTYPE (ext_decl
);
8352 current_function_prototype_arg_types
8353 = TYPE_ARG_TYPES (ext_type
);
8359 /* Optionally warn of old-fashioned def with no previous prototype. */
8360 if (warn_strict_prototypes
8361 && old_decl
!= error_mark_node
8362 && !prototype_p (TREE_TYPE (decl1
))
8363 && C_DECL_ISNT_PROTOTYPE (old_decl
))
8364 warning_at (loc
, OPT_Wstrict_prototypes
,
8365 "function declaration isn%'t a prototype");
8366 /* Optionally warn of any global def with no previous prototype. */
8367 else if (warn_missing_prototypes
8368 && old_decl
!= error_mark_node
8369 && TREE_PUBLIC (decl1
)
8370 && !MAIN_NAME_P (DECL_NAME (decl1
))
8371 && C_DECL_ISNT_PROTOTYPE (old_decl
)
8372 && !DECL_DECLARED_INLINE_P (decl1
))
8373 warning_at (loc
, OPT_Wmissing_prototypes
,
8374 "no previous prototype for %qD", decl1
);
8375 /* Optionally warn of any def with no previous prototype
8376 if the function has already been used. */
8377 else if (warn_missing_prototypes
8379 && old_decl
!= error_mark_node
8380 && TREE_USED (old_decl
)
8381 && !prototype_p (TREE_TYPE (old_decl
)))
8382 warning_at (loc
, OPT_Wmissing_prototypes
,
8383 "%qD was used with no prototype before its definition", decl1
);
8384 /* Optionally warn of any global def with no previous declaration. */
8385 else if (warn_missing_declarations
8386 && TREE_PUBLIC (decl1
)
8388 && !MAIN_NAME_P (DECL_NAME (decl1
))
8389 && !DECL_DECLARED_INLINE_P (decl1
))
8390 warning_at (loc
, OPT_Wmissing_declarations
,
8391 "no previous declaration for %qD",
8393 /* Optionally warn of any def with no previous declaration
8394 if the function has already been used. */
8395 else if (warn_missing_declarations
8397 && old_decl
!= error_mark_node
8398 && TREE_USED (old_decl
)
8399 && C_DECL_IMPLICIT (old_decl
))
8400 warning_at (loc
, OPT_Wmissing_declarations
,
8401 "%qD was used with no declaration before its definition", decl1
);
8403 /* This function exists in static storage.
8404 (This does not mean `static' in the C sense!) */
8405 TREE_STATIC (decl1
) = 1;
8407 /* This is the earliest point at which we might know the assembler
8408 name of the function. Thus, if it's set before this, die horribly. */
8409 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl1
));
8411 /* If #pragma weak was used, mark the decl weak now. */
8412 if (current_scope
== file_scope
)
8413 maybe_apply_pragma_weak (decl1
);
8415 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
8416 if (warn_main
&& MAIN_NAME_P (DECL_NAME (decl1
)))
8418 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1
)))
8419 != integer_type_node
)
8420 pedwarn (loc
, OPT_Wmain
, "return type of %qD is not %<int%>", decl1
);
8421 else if (TYPE_ATOMIC (TREE_TYPE (TREE_TYPE (decl1
))))
8422 pedwarn (loc
, OPT_Wmain
, "%<_Atomic%>-qualified return type of %qD",
8425 check_main_parameter_types (decl1
);
8427 if (!TREE_PUBLIC (decl1
))
8428 pedwarn (loc
, OPT_Wmain
,
8429 "%qD is normally a non-static function", decl1
);
8432 /* Record the decl so that the function name is defined.
8433 If we already have a decl for this name, and it is a FUNCTION_DECL,
8434 use the old decl. */
8436 current_function_decl
= pushdecl (decl1
);
8439 declare_parm_level ();
8441 restype
= TREE_TYPE (TREE_TYPE (current_function_decl
));
8442 resdecl
= build_decl (loc
, RESULT_DECL
, NULL_TREE
, restype
);
8443 DECL_ARTIFICIAL (resdecl
) = 1;
8444 DECL_IGNORED_P (resdecl
) = 1;
8445 DECL_RESULT (current_function_decl
) = resdecl
;
8447 start_fname_decls ();
8452 /* Subroutine of store_parm_decls which handles new-style function
8453 definitions (prototype format). The parms already have decls, so we
8454 need only record them as in effect and complain if any redundant
8455 old-style parm decls were written. */
8457 store_parm_decls_newstyle (tree fndecl
, const struct c_arg_info
*arg_info
)
8463 if (current_scope
->bindings
)
8465 error_at (DECL_SOURCE_LOCATION (fndecl
),
8466 "old-style parameter declarations in prototyped "
8467 "function definition");
8469 /* Get rid of the old-style declarations. */
8473 /* Don't issue this warning for nested functions, and don't issue this
8474 warning if we got here because ARG_INFO_TYPES was error_mark_node
8475 (this happens when a function definition has just an ellipsis in
8476 its parameter list). */
8477 else if (!in_system_header_at (input_location
)
8478 && !current_function_scope
8479 && arg_info
->types
!= error_mark_node
)
8480 warning_at (DECL_SOURCE_LOCATION (fndecl
), OPT_Wtraditional
,
8481 "traditional C rejects ISO C style function definitions");
8483 /* Now make all the parameter declarations visible in the function body.
8484 We can bypass most of the grunt work of pushdecl. */
8485 for (decl
= arg_info
->parms
; decl
; decl
= DECL_CHAIN (decl
))
8487 DECL_CONTEXT (decl
) = current_function_decl
;
8488 if (DECL_NAME (decl
))
8490 bind (DECL_NAME (decl
), decl
, current_scope
,
8491 /*invisible=*/false, /*nested=*/false,
8493 if (!TREE_USED (decl
))
8494 warn_if_shadowing (decl
);
8497 error_at (DECL_SOURCE_LOCATION (decl
), "parameter name omitted");
8500 /* Record the parameter list in the function declaration. */
8501 DECL_ARGUMENTS (fndecl
) = arg_info
->parms
;
8503 /* Now make all the ancillary declarations visible, likewise. */
8504 for (decl
= arg_info
->others
; decl
; decl
= DECL_CHAIN (decl
))
8506 DECL_CONTEXT (decl
) = current_function_decl
;
8507 if (DECL_NAME (decl
))
8508 bind (DECL_NAME (decl
), decl
, current_scope
,
8509 /*invisible=*/false,
8510 /*nested=*/(TREE_CODE (decl
) == FUNCTION_DECL
),
8514 /* And all the tag declarations. */
8515 FOR_EACH_VEC_SAFE_ELT_REVERSE (arg_info
->tags
, ix
, tag
)
8517 bind (tag
->id
, tag
->type
, current_scope
,
8518 /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION
);
8521 /* Subroutine of store_parm_decls which handles old-style function
8522 definitions (separate parameter list and declarations). */
8525 store_parm_decls_oldstyle (tree fndecl
, const struct c_arg_info
*arg_info
)
8527 struct c_binding
*b
;
8528 tree parm
, decl
, last
;
8529 tree parmids
= arg_info
->parms
;
8530 hash_set
<tree
> seen_args
;
8532 if (!in_system_header_at (input_location
))
8533 warning_at (DECL_SOURCE_LOCATION (fndecl
),
8534 OPT_Wold_style_definition
, "old-style function definition");
8536 /* Match each formal parameter name with its declaration. Save each
8537 decl in the appropriate TREE_PURPOSE slot of the parmids chain. */
8538 for (parm
= parmids
; parm
; parm
= TREE_CHAIN (parm
))
8540 if (TREE_VALUE (parm
) == 0)
8542 error_at (DECL_SOURCE_LOCATION (fndecl
),
8543 "parameter name missing from parameter list");
8544 TREE_PURPOSE (parm
) = 0;
8548 b
= I_SYMBOL_BINDING (TREE_VALUE (parm
));
8549 if (b
&& B_IN_CURRENT_SCOPE (b
))
8552 /* Skip erroneous parameters. */
8553 if (decl
== error_mark_node
)
8555 /* If we got something other than a PARM_DECL it is an error. */
8556 if (TREE_CODE (decl
) != PARM_DECL
)
8557 error_at (DECL_SOURCE_LOCATION (decl
),
8558 "%qD declared as a non-parameter", decl
);
8559 /* If the declaration is already marked, we have a duplicate
8560 name. Complain and ignore the duplicate. */
8561 else if (seen_args
.contains (decl
))
8563 error_at (DECL_SOURCE_LOCATION (decl
),
8564 "multiple parameters named %qD", decl
);
8565 TREE_PURPOSE (parm
) = 0;
8568 /* If the declaration says "void", complain and turn it into
8570 else if (VOID_TYPE_P (TREE_TYPE (decl
)))
8572 error_at (DECL_SOURCE_LOCATION (decl
),
8573 "parameter %qD declared with void type", decl
);
8574 TREE_TYPE (decl
) = integer_type_node
;
8575 DECL_ARG_TYPE (decl
) = integer_type_node
;
8576 layout_decl (decl
, 0);
8578 warn_if_shadowing (decl
);
8580 /* If no declaration found, default to int. */
8583 /* FIXME diagnostics: This should be the location of the argument,
8584 not the FNDECL. E.g., for an old-style declaration
8586 int f10(v) { blah; }
8588 We should use the location of the V, not the F10.
8589 Unfortunately, the V is an IDENTIFIER_NODE which has no
8590 location. In the future we need locations for c_arg_info
8593 See gcc.dg/Wshadow-3.c for an example of this problem. */
8594 decl
= build_decl (DECL_SOURCE_LOCATION (fndecl
),
8595 PARM_DECL
, TREE_VALUE (parm
), integer_type_node
);
8596 DECL_ARG_TYPE (decl
) = TREE_TYPE (decl
);
8598 warn_if_shadowing (decl
);
8601 pedwarn (DECL_SOURCE_LOCATION (decl
),
8602 OPT_Wimplicit_int
, "type of %qD defaults to %<int%>",
8605 warning_at (DECL_SOURCE_LOCATION (decl
),
8606 OPT_Wmissing_parameter_type
,
8607 "type of %qD defaults to %<int%>", decl
);
8610 TREE_PURPOSE (parm
) = decl
;
8611 seen_args
.add (decl
);
8614 /* Now examine the parms chain for incomplete declarations
8615 and declarations with no corresponding names. */
8617 for (b
= current_scope
->bindings
; b
; b
= b
->prev
)
8620 if (TREE_CODE (parm
) != PARM_DECL
)
8623 if (TREE_TYPE (parm
) != error_mark_node
8624 && !COMPLETE_TYPE_P (TREE_TYPE (parm
)))
8626 error_at (DECL_SOURCE_LOCATION (parm
),
8627 "parameter %qD has incomplete type", parm
);
8628 TREE_TYPE (parm
) = error_mark_node
;
8631 if (!seen_args
.contains (parm
))
8633 error_at (DECL_SOURCE_LOCATION (parm
),
8634 "declaration for parameter %qD but no such parameter",
8637 /* Pretend the parameter was not missing.
8638 This gets us to a standard state and minimizes
8639 further error messages. */
8640 parmids
= chainon (parmids
, tree_cons (parm
, 0, 0));
8644 /* Chain the declarations together in the order of the list of
8645 names. Store that chain in the function decl, replacing the
8646 list of names. Update the current scope to match. */
8647 DECL_ARGUMENTS (fndecl
) = 0;
8649 for (parm
= parmids
; parm
; parm
= TREE_CHAIN (parm
))
8650 if (TREE_PURPOSE (parm
))
8652 if (parm
&& TREE_PURPOSE (parm
))
8654 last
= TREE_PURPOSE (parm
);
8655 DECL_ARGUMENTS (fndecl
) = last
;
8657 for (parm
= TREE_CHAIN (parm
); parm
; parm
= TREE_CHAIN (parm
))
8658 if (TREE_PURPOSE (parm
))
8660 DECL_CHAIN (last
) = TREE_PURPOSE (parm
);
8661 last
= TREE_PURPOSE (parm
);
8663 DECL_CHAIN (last
) = 0;
8666 /* If there was a previous prototype,
8667 set the DECL_ARG_TYPE of each argument according to
8668 the type previously specified, and report any mismatches. */
8670 if (current_function_prototype_arg_types
)
8673 for (parm
= DECL_ARGUMENTS (fndecl
),
8674 type
= current_function_prototype_arg_types
;
8675 parm
|| (type
&& TREE_VALUE (type
) != error_mark_node
8676 && (TYPE_MAIN_VARIANT (TREE_VALUE (type
)) != void_type_node
));
8677 parm
= DECL_CHAIN (parm
), type
= TREE_CHAIN (type
))
8679 if (parm
== 0 || type
== 0
8680 || TYPE_MAIN_VARIANT (TREE_VALUE (type
)) == void_type_node
)
8682 if (current_function_prototype_built_in
)
8683 warning_at (DECL_SOURCE_LOCATION (fndecl
),
8684 0, "number of arguments doesn%'t match "
8685 "built-in prototype");
8688 /* FIXME diagnostics: This should be the location of
8689 FNDECL, but there is bug when a prototype is
8690 declared inside function context, but defined
8691 outside of it (e.g., gcc.dg/pr15698-2.c). In
8692 which case FNDECL gets the location of the
8693 prototype, not the definition. */
8694 error_at (input_location
,
8695 "number of arguments doesn%'t match prototype");
8697 error_at (current_function_prototype_locus
,
8698 "prototype declaration");
8702 /* Type for passing arg must be consistent with that
8703 declared for the arg. ISO C says we take the unqualified
8704 type for parameters declared with qualified type. */
8705 if (TREE_TYPE (parm
) != error_mark_node
8706 && TREE_TYPE (type
) != error_mark_node
8707 && ((TYPE_ATOMIC (DECL_ARG_TYPE (parm
))
8708 != TYPE_ATOMIC (TREE_VALUE (type
)))
8709 || !comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm
)),
8710 TYPE_MAIN_VARIANT (TREE_VALUE (type
)))))
8712 if ((TYPE_ATOMIC (DECL_ARG_TYPE (parm
))
8713 == TYPE_ATOMIC (TREE_VALUE (type
)))
8714 && (TYPE_MAIN_VARIANT (TREE_TYPE (parm
))
8715 == TYPE_MAIN_VARIANT (TREE_VALUE (type
))))
8717 /* Adjust argument to match prototype. E.g. a previous
8718 `int foo(float);' prototype causes
8719 `int foo(x) float x; {...}' to be treated like
8720 `int foo(float x) {...}'. This is particularly
8721 useful for argument types like uid_t. */
8722 DECL_ARG_TYPE (parm
) = TREE_TYPE (parm
);
8724 if (targetm
.calls
.promote_prototypes (TREE_TYPE (current_function_decl
))
8725 && INTEGRAL_TYPE_P (TREE_TYPE (parm
))
8726 && TYPE_PRECISION (TREE_TYPE (parm
))
8727 < TYPE_PRECISION (integer_type_node
))
8728 DECL_ARG_TYPE (parm
)
8729 = c_type_promotes_to (TREE_TYPE (parm
));
8731 /* ??? Is it possible to get here with a
8732 built-in prototype or will it always have
8733 been diagnosed as conflicting with an
8734 old-style definition and discarded? */
8735 if (current_function_prototype_built_in
)
8736 warning_at (DECL_SOURCE_LOCATION (parm
),
8737 OPT_Wpedantic
, "promoted argument %qD "
8738 "doesn%'t match built-in prototype", parm
);
8741 pedwarn (DECL_SOURCE_LOCATION (parm
),
8742 OPT_Wpedantic
, "promoted argument %qD "
8743 "doesn%'t match prototype", parm
);
8744 pedwarn (current_function_prototype_locus
, OPT_Wpedantic
,
8745 "prototype declaration");
8750 if (current_function_prototype_built_in
)
8751 warning_at (DECL_SOURCE_LOCATION (parm
),
8752 0, "argument %qD doesn%'t match "
8753 "built-in prototype", parm
);
8756 error_at (DECL_SOURCE_LOCATION (parm
),
8757 "argument %qD doesn%'t match prototype", parm
);
8758 error_at (current_function_prototype_locus
,
8759 "prototype declaration");
8764 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl
)) = 0;
8767 /* Otherwise, create a prototype that would match. */
8771 tree actual
= 0, last
= 0, type
;
8773 for (parm
= DECL_ARGUMENTS (fndecl
); parm
; parm
= DECL_CHAIN (parm
))
8775 type
= tree_cons (NULL_TREE
, DECL_ARG_TYPE (parm
), NULL_TREE
);
8777 TREE_CHAIN (last
) = type
;
8782 type
= tree_cons (NULL_TREE
, void_type_node
, NULL_TREE
);
8784 TREE_CHAIN (last
) = type
;
8788 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
8789 of the type of this function, but we need to avoid having this
8790 affect the types of other similarly-typed functions, so we must
8791 first force the generation of an identical (but separate) type
8792 node for the relevant function type. The new node we create
8793 will be a variant of the main variant of the original function
8796 TREE_TYPE (fndecl
) = build_variant_type_copy (TREE_TYPE (fndecl
));
8798 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl
)) = actual
;
8802 /* Store parameter declarations passed in ARG_INFO into the current
8803 function declaration. */
8806 store_parm_decls_from (struct c_arg_info
*arg_info
)
8808 current_function_arg_info
= arg_info
;
8809 store_parm_decls ();
8812 /* Called by walk_tree to look for and update context-less labels. */
8815 set_labels_context_r (tree
*tp
, int *walk_subtrees
, void *data
)
8817 if (TREE_CODE (*tp
) == LABEL_EXPR
8818 && DECL_CONTEXT (LABEL_EXPR_LABEL (*tp
)) == NULL_TREE
)
8820 DECL_CONTEXT (LABEL_EXPR_LABEL (*tp
)) = static_cast<tree
>(data
);
8827 /* Store the parameter declarations into the current function declaration.
8828 This is called after parsing the parameter declarations, before
8829 digesting the body of the function.
8831 For an old-style definition, construct a prototype out of the old-style
8832 parameter declarations and inject it into the function's type. */
8835 store_parm_decls (void)
8837 tree fndecl
= current_function_decl
;
8840 /* The argument information block for FNDECL. */
8841 struct c_arg_info
*arg_info
= current_function_arg_info
;
8842 current_function_arg_info
= 0;
8844 /* True if this definition is written with a prototype. Note:
8845 despite C99 6.7.5.3p14, we can *not* treat an empty argument
8846 list in a function definition as equivalent to (void) -- an
8847 empty argument list specifies the function has no parameters,
8848 but only (void) sets up a prototype for future calls. */
8849 proto
= arg_info
->types
!= 0;
8852 store_parm_decls_newstyle (fndecl
, arg_info
);
8854 store_parm_decls_oldstyle (fndecl
, arg_info
);
8856 /* The next call to push_scope will be a function body. */
8858 next_is_function_body
= true;
8860 /* Write a record describing this function definition to the prototypes
8861 file (if requested). */
8863 gen_aux_info_record (fndecl
, 1, 0, proto
);
8865 /* Initialize the RTL code for the function. */
8866 allocate_struct_function (fndecl
, false);
8868 if (warn_unused_local_typedefs
)
8869 cfun
->language
= ggc_cleared_alloc
<language_function
> ();
8871 /* Begin the statement tree for this function. */
8872 DECL_SAVED_TREE (fndecl
) = push_stmt_list ();
8874 /* ??? Insert the contents of the pending sizes list into the function
8875 to be evaluated. The only reason left to have this is
8876 void foo(int n, int array[n++])
8877 because we throw away the array type in favor of a pointer type, and
8878 thus won't naturally see the SAVE_EXPR containing the increment. All
8879 other pending sizes would be handled by gimplify_parameters. */
8880 if (arg_info
->pending_sizes
)
8882 /* In very special circumstances, e.g. for code like
8884 void f (int a[i += 2]) {}
8885 we need to execute the atomic assignment on function entry.
8886 But in this case, it is not just a straight store, it has the
8887 op= form, which means that build_atomic_assign has generated
8888 gotos, labels, etc. Because at that time the function decl
8889 for F has not been created yet, those labels do not have any
8890 function context. But we have the fndecl now, so update the
8891 labels accordingly. gimplify_expr would crash otherwise. */
8892 walk_tree_without_duplicates (&arg_info
->pending_sizes
,
8893 set_labels_context_r
, fndecl
);
8894 add_stmt (arg_info
->pending_sizes
);
8898 /* Store PARM_DECLs in PARMS into scope temporarily. Used for
8899 c_finish_omp_declare_simd for function prototypes. No diagnostics
8903 temp_store_parm_decls (tree fndecl
, tree parms
)
8906 for (tree p
= parms
; p
; p
= DECL_CHAIN (p
))
8908 DECL_CONTEXT (p
) = fndecl
;
8910 bind (DECL_NAME (p
), p
, current_scope
,
8911 /*invisible=*/false, /*nested=*/false,
8916 /* Undo what temp_store_parm_decls did. */
8919 temp_pop_parm_decls (void)
8921 /* Clear all bindings in this temporary scope, so that
8922 pop_scope doesn't create a BLOCK. */
8923 struct c_binding
*b
= current_scope
->bindings
;
8924 current_scope
->bindings
= NULL
;
8925 for (; b
; b
= free_binding_and_advance (b
))
8927 gcc_assert (TREE_CODE (b
->decl
) == PARM_DECL
);
8928 gcc_assert (I_SYMBOL_BINDING (b
->id
) == b
);
8929 I_SYMBOL_BINDING (b
->id
) = b
->shadowed
;
8930 if (b
->shadowed
&& b
->shadowed
->u
.type
)
8931 TREE_TYPE (b
->shadowed
->decl
) = b
->shadowed
->u
.type
;
8937 /* Finish up a function declaration and compile that function
8938 all the way to assembler language output. Then free the storage
8939 for the function definition.
8941 This is called after parsing the body of the function definition. */
8944 finish_function (void)
8946 tree fndecl
= current_function_decl
;
8948 if (c_dialect_objc ())
8949 objc_finish_function ();
8951 if (TREE_CODE (fndecl
) == FUNCTION_DECL
8952 && targetm
.calls
.promote_prototypes (TREE_TYPE (fndecl
)))
8954 tree args
= DECL_ARGUMENTS (fndecl
);
8955 for (; args
; args
= DECL_CHAIN (args
))
8957 tree type
= TREE_TYPE (args
);
8958 if (INTEGRAL_TYPE_P (type
)
8959 && TYPE_PRECISION (type
) < TYPE_PRECISION (integer_type_node
))
8960 DECL_ARG_TYPE (args
) = c_type_promotes_to (type
);
8964 if (DECL_INITIAL (fndecl
) && DECL_INITIAL (fndecl
) != error_mark_node
)
8965 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl
)) = fndecl
;
8967 /* Must mark the RESULT_DECL as being in this function. */
8969 if (DECL_RESULT (fndecl
) && DECL_RESULT (fndecl
) != error_mark_node
)
8970 DECL_CONTEXT (DECL_RESULT (fndecl
)) = fndecl
;
8972 if (MAIN_NAME_P (DECL_NAME (fndecl
)) && flag_hosted
8973 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl
)))
8974 == integer_type_node
&& flag_isoc99
)
8976 /* Hack. We don't want the middle-end to warn that this return
8977 is unreachable, so we mark its location as special. Using
8978 UNKNOWN_LOCATION has the problem that it gets clobbered in
8979 annotate_one_with_locus. A cleaner solution might be to
8980 ensure ! should_carry_locus_p (stmt), but that needs a flag.
8982 c_finish_return (BUILTINS_LOCATION
, integer_zero_node
, NULL_TREE
);
8985 /* Tie off the statement tree for this function. */
8986 DECL_SAVED_TREE (fndecl
) = pop_stmt_list (DECL_SAVED_TREE (fndecl
));
8988 /* If the function has _Cilk_spawn in front of a function call inside it
8989 i.e. it is a spawning function, then add the appropriate Cilk plus
8990 functions inside. */
8991 if (fn_contains_cilk_spawn_p (cfun
))
8992 cfun
->cilk_frame_decl
= insert_cilk_frame (fndecl
);
8994 finish_fname_decls ();
8996 /* Complain if there's just no return statement. */
8997 if (warn_return_type
8998 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl
))) != VOID_TYPE
8999 && !current_function_returns_value
&& !current_function_returns_null
9000 /* Don't complain if we are no-return. */
9001 && !current_function_returns_abnormally
9002 /* Don't complain if we are declared noreturn. */
9003 && !TREE_THIS_VOLATILE (fndecl
)
9004 /* Don't warn for main(). */
9005 && !MAIN_NAME_P (DECL_NAME (fndecl
))
9006 /* Or if they didn't actually specify a return type. */
9007 && !C_FUNCTION_IMPLICIT_INT (fndecl
)
9008 /* Normally, with -Wreturn-type, flow will complain, but we might
9009 optimize out static functions. */
9010 && !TREE_PUBLIC (fndecl
))
9012 warning (OPT_Wreturn_type
,
9013 "no return statement in function returning non-void");
9014 TREE_NO_WARNING (fndecl
) = 1;
9017 /* Complain about parameters that are only set, but never otherwise used. */
9018 if (warn_unused_but_set_parameter
)
9022 for (decl
= DECL_ARGUMENTS (fndecl
);
9024 decl
= DECL_CHAIN (decl
))
9025 if (TREE_USED (decl
)
9026 && TREE_CODE (decl
) == PARM_DECL
9027 && !DECL_READ_P (decl
)
9029 && !DECL_ARTIFICIAL (decl
)
9030 && !TREE_NO_WARNING (decl
))
9031 warning_at (DECL_SOURCE_LOCATION (decl
),
9032 OPT_Wunused_but_set_parameter
,
9033 "parameter %qD set but not used", decl
);
9036 /* Complain about locally defined typedefs that are not used in this
9038 maybe_warn_unused_local_typedefs ();
9040 /* Store the end of the function, so that we get good line number
9041 info for the epilogue. */
9042 cfun
->function_end_locus
= input_location
;
9044 /* Finalize the ELF visibility for the function. */
9045 c_determine_visibility (fndecl
);
9047 /* For GNU C extern inline functions disregard inline limits. */
9048 if (DECL_EXTERNAL (fndecl
)
9049 && DECL_DECLARED_INLINE_P (fndecl
))
9050 DECL_DISREGARD_INLINE_LIMITS (fndecl
) = 1;
9052 /* Genericize before inlining. Delay genericizing nested functions
9053 until their parent function is genericized. Since finalizing
9054 requires GENERIC, delay that as well. */
9056 if (DECL_INITIAL (fndecl
) && DECL_INITIAL (fndecl
) != error_mark_node
9057 && !undef_nested_function
)
9059 if (!decl_function_context (fndecl
))
9061 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE
, fndecl
);
9062 c_genericize (fndecl
);
9064 /* ??? Objc emits functions after finalizing the compilation unit.
9065 This should be cleaned up later and this conditional removed. */
9066 if (symtab
->global_info_ready
)
9068 cgraph_node::add_new_function (fndecl
, false);
9071 cgraph_node::finalize_function (fndecl
, false);
9075 /* Register this function with cgraph just far enough to get it
9076 added to our parent's nested function list. Handy, since the
9077 C front end doesn't have such a list. */
9078 (void) cgraph_node::get_create (fndecl
);
9082 if (!decl_function_context (fndecl
))
9083 undef_nested_function
= false;
9085 if (cfun
->language
!= NULL
)
9087 ggc_free (cfun
->language
);
9088 cfun
->language
= NULL
;
9091 /* We're leaving the context of this function, so zap cfun.
9092 It's still in DECL_STRUCT_FUNCTION, and we'll restore it in
9093 tree_rest_of_compilation. */
9095 invoke_plugin_callbacks (PLUGIN_FINISH_PARSE_FUNCTION
, current_function_decl
);
9096 current_function_decl
= NULL
;
9099 /* Check the declarations given in a for-loop for satisfying the C99
9100 constraints. If exactly one such decl is found, return it. LOC is
9101 the location of the opening parenthesis of the for loop. The last
9102 parameter allows you to control the "for loop initial declarations
9103 are only allowed in C99 mode". Normally, you should pass
9104 flag_isoc99 as that parameter. But in some cases (Objective-C
9105 foreach loop, for example) we want to run the checks in this
9106 function even if not in C99 mode, so we allow the caller to turn
9107 off the error about not being in C99 mode.
9111 check_for_loop_decls (location_t loc
, bool turn_off_iso_c99_error
)
9113 struct c_binding
*b
;
9114 tree one_decl
= NULL_TREE
;
9117 if (!turn_off_iso_c99_error
)
9119 static bool hint
= true;
9120 /* If we get here, declarations have been used in a for loop without
9121 the C99 for loop scope. This doesn't make much sense, so don't
9123 error_at (loc
, "%<for%> loop initial declarations "
9124 "are only allowed in C99 or C11 mode");
9128 "use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 "
9129 "to compile your code");
9134 /* C99 subclause 6.8.5 paragraph 3:
9136 [#3] The declaration part of a for statement shall only
9137 declare identifiers for objects having storage class auto or
9140 It isn't clear whether, in this sentence, "identifiers" binds to
9141 "shall only declare" or to "objects" - that is, whether all identifiers
9142 declared must be identifiers for objects, or whether the restriction
9143 only applies to those that are. (A question on this in comp.std.c
9144 in November 2000 received no answer.) We implement the strictest
9145 interpretation, to avoid creating an extension which later causes
9148 for (b
= current_scope
->bindings
; b
; b
= b
->prev
)
9151 tree decl
= b
->decl
;
9156 switch (TREE_CODE (decl
))
9160 location_t decl_loc
= DECL_SOURCE_LOCATION (decl
);
9161 if (TREE_STATIC (decl
))
9163 "declaration of static variable %qD in %<for%> loop "
9164 "initial declaration", decl
);
9165 else if (DECL_EXTERNAL (decl
))
9167 "declaration of %<extern%> variable %qD in %<for%> loop "
9168 "initial declaration", decl
);
9174 "%<struct %E%> declared in %<for%> loop initial "
9179 "%<union %E%> declared in %<for%> loop initial declaration",
9183 error_at (loc
, "%<enum %E%> declared in %<for%> loop "
9184 "initial declaration", id
);
9187 error_at (loc
, "declaration of non-variable "
9188 "%qD in %<for%> loop initial declaration", decl
);
9195 return n_decls
== 1 ? one_decl
: NULL_TREE
;
9198 /* Save and reinitialize the variables
9199 used during compilation of a C function. */
9202 c_push_function_context (void)
9204 struct language_function
*p
= cfun
->language
;
9205 /* cfun->language might have been already allocated by the use of
9206 -Wunused-local-typedefs. In that case, just re-use it. */
9208 cfun
->language
= p
= ggc_cleared_alloc
<language_function
> ();
9210 p
->base
.x_stmt_tree
= c_stmt_tree
;
9211 c_stmt_tree
.x_cur_stmt_list
= vec_safe_copy (c_stmt_tree
.x_cur_stmt_list
);
9212 p
->x_break_label
= c_break_label
;
9213 p
->x_cont_label
= c_cont_label
;
9214 p
->x_switch_stack
= c_switch_stack
;
9215 p
->arg_info
= current_function_arg_info
;
9216 p
->returns_value
= current_function_returns_value
;
9217 p
->returns_null
= current_function_returns_null
;
9218 p
->returns_abnormally
= current_function_returns_abnormally
;
9219 p
->warn_about_return_type
= warn_about_return_type
;
9221 push_function_context ();
9224 /* Restore the variables used during compilation of a C function. */
9227 c_pop_function_context (void)
9229 struct language_function
*p
;
9231 pop_function_context ();
9234 /* When -Wunused-local-typedefs is in effect, cfun->languages is
9235 used to store data throughout the life time of the current cfun,
9236 So don't deallocate it. */
9237 if (!warn_unused_local_typedefs
)
9238 cfun
->language
= NULL
;
9240 if (DECL_STRUCT_FUNCTION (current_function_decl
) == 0
9241 && DECL_SAVED_TREE (current_function_decl
) == NULL_TREE
)
9243 /* Stop pointing to the local nodes about to be freed. */
9244 /* But DECL_INITIAL must remain nonzero so we know this
9245 was an actual function definition. */
9246 DECL_INITIAL (current_function_decl
) = error_mark_node
;
9247 DECL_ARGUMENTS (current_function_decl
) = 0;
9250 c_stmt_tree
= p
->base
.x_stmt_tree
;
9251 p
->base
.x_stmt_tree
.x_cur_stmt_list
= NULL
;
9252 c_break_label
= p
->x_break_label
;
9253 c_cont_label
= p
->x_cont_label
;
9254 c_switch_stack
= p
->x_switch_stack
;
9255 current_function_arg_info
= p
->arg_info
;
9256 current_function_returns_value
= p
->returns_value
;
9257 current_function_returns_null
= p
->returns_null
;
9258 current_function_returns_abnormally
= p
->returns_abnormally
;
9259 warn_about_return_type
= p
->warn_about_return_type
;
9262 /* The functions below are required for functionality of doing
9263 function at once processing in the C front end. Currently these
9264 functions are not called from anywhere in the C front end, but as
9265 these changes continue, that will change. */
9267 /* Returns the stmt_tree (if any) to which statements are currently
9268 being added. If there is no active statement-tree, NULL is
9272 current_stmt_tree (void)
9274 return &c_stmt_tree
;
9277 /* Return the global value of T as a symbol. */
9280 identifier_global_value (tree t
)
9282 struct c_binding
*b
;
9284 for (b
= I_SYMBOL_BINDING (t
); b
; b
= b
->shadowed
)
9285 if (B_IN_FILE_SCOPE (b
) || B_IN_EXTERNAL_SCOPE (b
))
9291 /* In C, the only C-linkage public declaration is at file scope. */
9294 c_linkage_bindings (tree name
)
9296 return identifier_global_value (name
);
9299 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
9300 otherwise the name is found in ridpointers from RID_INDEX. */
9303 record_builtin_type (enum rid rid_index
, const char *name
, tree type
)
9307 id
= ridpointers
[(int) rid_index
];
9309 id
= get_identifier (name
);
9310 decl
= build_decl (UNKNOWN_LOCATION
, TYPE_DECL
, id
, type
);
9312 if (debug_hooks
->type_decl
)
9313 debug_hooks
->type_decl (decl
, false);
9316 /* Build the void_list_node (void_type_node having been created). */
9318 build_void_list_node (void)
9320 tree t
= build_tree_list (NULL_TREE
, void_type_node
);
9324 /* Return a c_parm structure with the given SPECS, ATTRS and DECLARATOR. */
9327 build_c_parm (struct c_declspecs
*specs
, tree attrs
,
9328 struct c_declarator
*declarator
)
9330 struct c_parm
*ret
= XOBNEW (&parser_obstack
, struct c_parm
);
9333 ret
->declarator
= declarator
;
9337 /* Return a declarator with nested attributes. TARGET is the inner
9338 declarator to which these attributes apply. ATTRS are the
9341 struct c_declarator
*
9342 build_attrs_declarator (tree attrs
, struct c_declarator
*target
)
9344 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
9345 ret
->kind
= cdk_attrs
;
9346 ret
->declarator
= target
;
9347 ret
->u
.attrs
= attrs
;
9351 /* Return a declarator for a function with arguments specified by ARGS
9352 and return type specified by TARGET. */
9354 struct c_declarator
*
9355 build_function_declarator (struct c_arg_info
*args
,
9356 struct c_declarator
*target
)
9358 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
9359 ret
->kind
= cdk_function
;
9360 ret
->declarator
= target
;
9361 ret
->u
.arg_info
= args
;
9365 /* Return a declarator for the identifier IDENT (which may be
9366 NULL_TREE for an abstract declarator). */
9368 struct c_declarator
*
9369 build_id_declarator (tree ident
)
9371 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
9373 ret
->declarator
= 0;
9375 /* Default value - may get reset to a more precise location. */
9376 ret
->id_loc
= input_location
;
9380 /* Return something to represent absolute declarators containing a *.
9381 TARGET is the absolute declarator that the * contains.
9382 TYPE_QUALS_ATTRS is a structure for type qualifiers and attributes
9383 to apply to the pointer type. */
9385 struct c_declarator
*
9386 make_pointer_declarator (struct c_declspecs
*type_quals_attrs
,
9387 struct c_declarator
*target
)
9391 struct c_declarator
*itarget
= target
;
9392 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
9393 if (type_quals_attrs
)
9395 attrs
= type_quals_attrs
->attrs
;
9396 quals
= quals_from_declspecs (type_quals_attrs
);
9397 if (attrs
!= NULL_TREE
)
9398 itarget
= build_attrs_declarator (attrs
, target
);
9400 ret
->kind
= cdk_pointer
;
9401 ret
->declarator
= itarget
;
9402 ret
->u
.pointer_quals
= quals
;
9406 /* Return a pointer to a structure for an empty list of declaration
9409 struct c_declspecs
*
9410 build_null_declspecs (void)
9412 struct c_declspecs
*ret
= XOBNEW (&parser_obstack
, struct c_declspecs
);
9413 memset (&ret
->locations
, 0, cdw_number_of_elements
);
9418 ret
->align_log
= -1;
9419 ret
->typespec_word
= cts_none
;
9420 ret
->storage_class
= csc_none
;
9421 ret
->expr_const_operands
= true;
9422 ret
->declspecs_seen_p
= false;
9423 ret
->typespec_kind
= ctsk_none
;
9424 ret
->non_sc_seen_p
= false;
9425 ret
->typedef_p
= false;
9426 ret
->explicit_signed_p
= false;
9427 ret
->deprecated_p
= false;
9428 ret
->default_int_p
= false;
9429 ret
->long_p
= false;
9430 ret
->long_long_p
= false;
9431 ret
->short_p
= false;
9432 ret
->signed_p
= false;
9433 ret
->unsigned_p
= false;
9434 ret
->complex_p
= false;
9435 ret
->inline_p
= false;
9436 ret
->noreturn_p
= false;
9437 ret
->thread_p
= false;
9438 ret
->thread_gnu_p
= false;
9439 ret
->const_p
= false;
9440 ret
->volatile_p
= false;
9441 ret
->atomic_p
= false;
9442 ret
->restrict_p
= false;
9443 ret
->saturating_p
= false;
9444 ret
->alignas_p
= false;
9445 ret
->address_space
= ADDR_SPACE_GENERIC
;
9449 /* Add the address space ADDRSPACE to the declaration specifiers
9450 SPECS, returning SPECS. */
9452 struct c_declspecs
*
9453 declspecs_add_addrspace (source_location location
,
9454 struct c_declspecs
*specs
, addr_space_t as
)
9456 specs
->non_sc_seen_p
= true;
9457 specs
->declspecs_seen_p
= true;
9459 if (!ADDR_SPACE_GENERIC_P (specs
->address_space
)
9460 && specs
->address_space
!= as
)
9461 error ("incompatible address space qualifiers %qs and %qs",
9462 c_addr_space_name (as
),
9463 c_addr_space_name (specs
->address_space
));
9466 specs
->address_space
= as
;
9467 specs
->locations
[cdw_address_space
] = location
;
9472 /* Add the type qualifier QUAL to the declaration specifiers SPECS,
9475 struct c_declspecs
*
9476 declspecs_add_qual (source_location loc
,
9477 struct c_declspecs
*specs
, tree qual
)
9481 specs
->non_sc_seen_p
= true;
9482 specs
->declspecs_seen_p
= true;
9483 gcc_assert (TREE_CODE (qual
) == IDENTIFIER_NODE
9484 && C_IS_RESERVED_WORD (qual
));
9485 i
= C_RID_CODE (qual
);
9489 dupe
= specs
->const_p
;
9490 specs
->const_p
= true;
9491 specs
->locations
[cdw_const
] = loc
;
9494 dupe
= specs
->volatile_p
;
9495 specs
->volatile_p
= true;
9496 specs
->locations
[cdw_volatile
] = loc
;
9499 dupe
= specs
->restrict_p
;
9500 specs
->restrict_p
= true;
9501 specs
->locations
[cdw_restrict
] = loc
;
9504 dupe
= specs
->atomic_p
;
9505 specs
->atomic_p
= true;
9511 pedwarn_c90 (loc
, OPT_Wpedantic
, "duplicate %qE", qual
);
9515 /* Add the type specifier TYPE to the declaration specifiers SPECS,
9518 struct c_declspecs
*
9519 declspecs_add_type (location_t loc
, struct c_declspecs
*specs
,
9520 struct c_typespec spec
)
9522 tree type
= spec
.spec
;
9523 specs
->non_sc_seen_p
= true;
9524 specs
->declspecs_seen_p
= true;
9525 specs
->typespec_kind
= spec
.kind
;
9526 if (TREE_DEPRECATED (type
))
9527 specs
->deprecated_p
= true;
9529 /* Handle type specifier keywords. */
9530 if (TREE_CODE (type
) == IDENTIFIER_NODE
9531 && C_IS_RESERVED_WORD (type
)
9532 && C_RID_CODE (type
) != RID_CXX_COMPAT_WARN
)
9534 enum rid i
= C_RID_CODE (type
);
9537 error_at (loc
, "two or more data types in declaration specifiers");
9540 if ((int) i
<= (int) RID_LAST_MODIFIER
)
9542 /* "long", "short", "signed", "unsigned", "_Complex" or "_Sat". */
9547 if (specs
->long_long_p
)
9549 error_at (loc
, "%<long long long%> is too long for GCC");
9554 if (specs
->typespec_word
== cts_double
)
9557 ("both %<long long%> and %<double%> in "
9558 "declaration specifiers"));
9561 pedwarn_c90 (loc
, OPT_Wlong_long
,
9562 "ISO C90 does not support %<long long%>");
9563 specs
->long_long_p
= 1;
9564 specs
->locations
[cdw_long_long
] = loc
;
9569 ("both %<long%> and %<short%> in "
9570 "declaration specifiers"));
9571 else if (specs
->typespec_word
== cts_auto_type
)
9573 ("both %<long%> and %<__auto_type%> in "
9574 "declaration specifiers"));
9575 else if (specs
->typespec_word
== cts_void
)
9577 ("both %<long%> and %<void%> in "
9578 "declaration specifiers"));
9579 else if (specs
->typespec_word
== cts_int_n
)
9581 ("both %<long%> and %<__int%d%> in "
9582 "declaration specifiers"),
9583 int_n_data
[specs
->int_n_idx
].bitsize
);
9584 else if (specs
->typespec_word
== cts_bool
)
9586 ("both %<long%> and %<_Bool%> in "
9587 "declaration specifiers"));
9588 else if (specs
->typespec_word
== cts_char
)
9590 ("both %<long%> and %<char%> in "
9591 "declaration specifiers"));
9592 else if (specs
->typespec_word
== cts_float
)
9594 ("both %<long%> and %<float%> in "
9595 "declaration specifiers"));
9596 else if (specs
->typespec_word
== cts_dfloat32
)
9598 ("both %<long%> and %<_Decimal32%> in "
9599 "declaration specifiers"));
9600 else if (specs
->typespec_word
== cts_dfloat64
)
9602 ("both %<long%> and %<_Decimal64%> in "
9603 "declaration specifiers"));
9604 else if (specs
->typespec_word
== cts_dfloat128
)
9606 ("both %<long%> and %<_Decimal128%> in "
9607 "declaration specifiers"));
9610 specs
->long_p
= true;
9611 specs
->locations
[cdw_long
] = loc
;
9615 dupe
= specs
->short_p
;
9618 ("both %<long%> and %<short%> in "
9619 "declaration specifiers"));
9620 else if (specs
->typespec_word
== cts_auto_type
)
9622 ("both %<short%> and %<__auto_type%> in "
9623 "declaration specifiers"));
9624 else if (specs
->typespec_word
== cts_void
)
9626 ("both %<short%> and %<void%> in "
9627 "declaration specifiers"));
9628 else if (specs
->typespec_word
== cts_int_n
)
9630 ("both %<short%> and %<__int%d%> in "
9631 "declaration specifiers"),
9632 int_n_data
[specs
->int_n_idx
].bitsize
);
9633 else if (specs
->typespec_word
== cts_bool
)
9635 ("both %<short%> and %<_Bool%> in "
9636 "declaration specifiers"));
9637 else if (specs
->typespec_word
== cts_char
)
9639 ("both %<short%> and %<char%> in "
9640 "declaration specifiers"));
9641 else if (specs
->typespec_word
== cts_float
)
9643 ("both %<short%> and %<float%> in "
9644 "declaration specifiers"));
9645 else if (specs
->typespec_word
== cts_double
)
9647 ("both %<short%> and %<double%> in "
9648 "declaration specifiers"));
9649 else if (specs
->typespec_word
== cts_dfloat32
)
9651 ("both %<short%> and %<_Decimal32%> in "
9652 "declaration specifiers"));
9653 else if (specs
->typespec_word
== cts_dfloat64
)
9655 ("both %<short%> and %<_Decimal64%> in "
9656 "declaration specifiers"));
9657 else if (specs
->typespec_word
== cts_dfloat128
)
9659 ("both %<short%> and %<_Decimal128%> in "
9660 "declaration specifiers"));
9663 specs
->short_p
= true;
9664 specs
->locations
[cdw_short
] = loc
;
9668 dupe
= specs
->signed_p
;
9669 if (specs
->unsigned_p
)
9671 ("both %<signed%> and %<unsigned%> in "
9672 "declaration specifiers"));
9673 else if (specs
->typespec_word
== cts_auto_type
)
9675 ("both %<signed%> and %<__auto_type%> in "
9676 "declaration specifiers"));
9677 else if (specs
->typespec_word
== cts_void
)
9679 ("both %<signed%> and %<void%> in "
9680 "declaration specifiers"));
9681 else if (specs
->typespec_word
== cts_bool
)
9683 ("both %<signed%> and %<_Bool%> in "
9684 "declaration specifiers"));
9685 else if (specs
->typespec_word
== cts_float
)
9687 ("both %<signed%> and %<float%> in "
9688 "declaration specifiers"));
9689 else if (specs
->typespec_word
== cts_double
)
9691 ("both %<signed%> and %<double%> in "
9692 "declaration specifiers"));
9693 else if (specs
->typespec_word
== cts_dfloat32
)
9695 ("both %<signed%> and %<_Decimal32%> in "
9696 "declaration specifiers"));
9697 else if (specs
->typespec_word
== cts_dfloat64
)
9699 ("both %<signed%> and %<_Decimal64%> in "
9700 "declaration specifiers"));
9701 else if (specs
->typespec_word
== cts_dfloat128
)
9703 ("both %<signed%> and %<_Decimal128%> in "
9704 "declaration specifiers"));
9707 specs
->signed_p
= true;
9708 specs
->locations
[cdw_signed
] = loc
;
9712 dupe
= specs
->unsigned_p
;
9713 if (specs
->signed_p
)
9715 ("both %<signed%> and %<unsigned%> in "
9716 "declaration specifiers"));
9717 else if (specs
->typespec_word
== cts_auto_type
)
9719 ("both %<unsigned%> and %<__auto_type%> in "
9720 "declaration specifiers"));
9721 else if (specs
->typespec_word
== cts_void
)
9723 ("both %<unsigned%> and %<void%> in "
9724 "declaration specifiers"));
9725 else if (specs
->typespec_word
== cts_bool
)
9727 ("both %<unsigned%> and %<_Bool%> in "
9728 "declaration specifiers"));
9729 else if (specs
->typespec_word
== cts_float
)
9731 ("both %<unsigned%> and %<float%> in "
9732 "declaration specifiers"));
9733 else if (specs
->typespec_word
== cts_double
)
9735 ("both %<unsigned%> and %<double%> in "
9736 "declaration specifiers"));
9737 else if (specs
->typespec_word
== cts_dfloat32
)
9739 ("both %<unsigned%> and %<_Decimal32%> in "
9740 "declaration specifiers"));
9741 else if (specs
->typespec_word
== cts_dfloat64
)
9743 ("both %<unsigned%> and %<_Decimal64%> in "
9744 "declaration specifiers"));
9745 else if (specs
->typespec_word
== cts_dfloat128
)
9747 ("both %<unsigned%> and %<_Decimal128%> in "
9748 "declaration specifiers"));
9751 specs
->unsigned_p
= true;
9752 specs
->locations
[cdw_unsigned
] = loc
;
9756 dupe
= specs
->complex_p
;
9757 if (!in_system_header_at (loc
))
9758 pedwarn_c90 (loc
, OPT_Wpedantic
,
9759 "ISO C90 does not support complex types");
9760 if (specs
->typespec_word
== cts_auto_type
)
9762 ("both %<complex%> and %<__auto_type%> in "
9763 "declaration specifiers"));
9764 else if (specs
->typespec_word
== cts_void
)
9766 ("both %<complex%> and %<void%> in "
9767 "declaration specifiers"));
9768 else if (specs
->typespec_word
== cts_bool
)
9770 ("both %<complex%> and %<_Bool%> in "
9771 "declaration specifiers"));
9772 else if (specs
->typespec_word
== cts_dfloat32
)
9774 ("both %<complex%> and %<_Decimal32%> in "
9775 "declaration specifiers"));
9776 else if (specs
->typespec_word
== cts_dfloat64
)
9778 ("both %<complex%> and %<_Decimal64%> in "
9779 "declaration specifiers"));
9780 else if (specs
->typespec_word
== cts_dfloat128
)
9782 ("both %<complex%> and %<_Decimal128%> in "
9783 "declaration specifiers"));
9784 else if (specs
->typespec_word
== cts_fract
)
9786 ("both %<complex%> and %<_Fract%> in "
9787 "declaration specifiers"));
9788 else if (specs
->typespec_word
== cts_accum
)
9790 ("both %<complex%> and %<_Accum%> in "
9791 "declaration specifiers"));
9792 else if (specs
->saturating_p
)
9794 ("both %<complex%> and %<_Sat%> in "
9795 "declaration specifiers"));
9798 specs
->complex_p
= true;
9799 specs
->locations
[cdw_complex
] = loc
;
9803 dupe
= specs
->saturating_p
;
9804 pedwarn (loc
, OPT_Wpedantic
,
9805 "ISO C does not support saturating types");
9806 if (specs
->typespec_word
== cts_int_n
)
9809 ("both %<_Sat%> and %<__int%d%> in "
9810 "declaration specifiers"),
9811 int_n_data
[specs
->int_n_idx
].bitsize
);
9813 else if (specs
->typespec_word
== cts_auto_type
)
9815 ("both %<_Sat%> and %<__auto_type%> in "
9816 "declaration specifiers"));
9817 else if (specs
->typespec_word
== cts_void
)
9819 ("both %<_Sat%> and %<void%> in "
9820 "declaration specifiers"));
9821 else if (specs
->typespec_word
== cts_bool
)
9823 ("both %<_Sat%> and %<_Bool%> in "
9824 "declaration specifiers"));
9825 else if (specs
->typespec_word
== cts_char
)
9827 ("both %<_Sat%> and %<char%> in "
9828 "declaration specifiers"));
9829 else if (specs
->typespec_word
== cts_int
)
9831 ("both %<_Sat%> and %<int%> in "
9832 "declaration specifiers"));
9833 else if (specs
->typespec_word
== cts_float
)
9835 ("both %<_Sat%> and %<float%> in "
9836 "declaration specifiers"));
9837 else if (specs
->typespec_word
== cts_double
)
9839 ("both %<_Sat%> and %<double%> in "
9840 "declaration specifiers"));
9841 else if (specs
->typespec_word
== cts_dfloat32
)
9843 ("both %<_Sat%> and %<_Decimal32%> in "
9844 "declaration specifiers"));
9845 else if (specs
->typespec_word
== cts_dfloat64
)
9847 ("both %<_Sat%> and %<_Decimal64%> in "
9848 "declaration specifiers"));
9849 else if (specs
->typespec_word
== cts_dfloat128
)
9851 ("both %<_Sat%> and %<_Decimal128%> in "
9852 "declaration specifiers"));
9853 else if (specs
->complex_p
)
9855 ("both %<_Sat%> and %<complex%> in "
9856 "declaration specifiers"));
9859 specs
->saturating_p
= true;
9860 specs
->locations
[cdw_saturating
] = loc
;
9868 error_at (loc
, "duplicate %qE", type
);
9874 /* "void", "_Bool", "char", "int", "float", "double", "_Decimal32",
9875 "__intN", "_Decimal64", "_Decimal128", "_Fract", "_Accum" or
9877 if (specs
->typespec_word
!= cts_none
)
9880 "two or more data types in declaration specifiers");
9888 ("both %<long%> and %<__auto_type%> in "
9889 "declaration specifiers"));
9890 else if (specs
->short_p
)
9892 ("both %<short%> and %<__auto_type%> in "
9893 "declaration specifiers"));
9894 else if (specs
->signed_p
)
9896 ("both %<signed%> and %<__auto_type%> in "
9897 "declaration specifiers"));
9898 else if (specs
->unsigned_p
)
9900 ("both %<unsigned%> and %<__auto_type%> in "
9901 "declaration specifiers"));
9902 else if (specs
->complex_p
)
9904 ("both %<complex%> and %<__auto_type%> in "
9905 "declaration specifiers"));
9906 else if (specs
->saturating_p
)
9908 ("both %<_Sat%> and %<__auto_type%> in "
9909 "declaration specifiers"));
9912 specs
->typespec_word
= cts_auto_type
;
9913 specs
->locations
[cdw_typespec
] = loc
;
9920 specs
->int_n_idx
= i
- RID_INT_N_0
;
9921 if (!in_system_header_at (input_location
))
9922 pedwarn (loc
, OPT_Wpedantic
,
9923 "ISO C does not support %<__int%d%> types",
9924 int_n_data
[specs
->int_n_idx
].bitsize
);
9928 ("both %<__int%d%> and %<long%> in "
9929 "declaration specifiers"),
9930 int_n_data
[specs
->int_n_idx
].bitsize
);
9931 else if (specs
->saturating_p
)
9933 ("both %<_Sat%> and %<__int%d%> in "
9934 "declaration specifiers"),
9935 int_n_data
[specs
->int_n_idx
].bitsize
);
9936 else if (specs
->short_p
)
9938 ("both %<__int%d%> and %<short%> in "
9939 "declaration specifiers"),
9940 int_n_data
[specs
->int_n_idx
].bitsize
);
9941 else if (! int_n_enabled_p
[specs
->int_n_idx
])
9943 "%<__int%d%> is not supported on this target",
9944 int_n_data
[specs
->int_n_idx
].bitsize
);
9947 specs
->typespec_word
= cts_int_n
;
9948 specs
->locations
[cdw_typespec
] = loc
;
9954 ("both %<long%> and %<void%> in "
9955 "declaration specifiers"));
9956 else if (specs
->short_p
)
9958 ("both %<short%> and %<void%> in "
9959 "declaration specifiers"));
9960 else if (specs
->signed_p
)
9962 ("both %<signed%> and %<void%> in "
9963 "declaration specifiers"));
9964 else if (specs
->unsigned_p
)
9966 ("both %<unsigned%> and %<void%> in "
9967 "declaration specifiers"));
9968 else if (specs
->complex_p
)
9970 ("both %<complex%> and %<void%> in "
9971 "declaration specifiers"));
9972 else if (specs
->saturating_p
)
9974 ("both %<_Sat%> and %<void%> in "
9975 "declaration specifiers"));
9978 specs
->typespec_word
= cts_void
;
9979 specs
->locations
[cdw_typespec
] = loc
;
9983 if (!in_system_header_at (loc
))
9984 pedwarn_c90 (loc
, OPT_Wpedantic
,
9985 "ISO C90 does not support boolean types");
9988 ("both %<long%> and %<_Bool%> in "
9989 "declaration specifiers"));
9990 else if (specs
->short_p
)
9992 ("both %<short%> and %<_Bool%> in "
9993 "declaration specifiers"));
9994 else if (specs
->signed_p
)
9996 ("both %<signed%> and %<_Bool%> in "
9997 "declaration specifiers"));
9998 else if (specs
->unsigned_p
)
10000 ("both %<unsigned%> and %<_Bool%> in "
10001 "declaration specifiers"));
10002 else if (specs
->complex_p
)
10004 ("both %<complex%> and %<_Bool%> in "
10005 "declaration specifiers"));
10006 else if (specs
->saturating_p
)
10008 ("both %<_Sat%> and %<_Bool%> in "
10009 "declaration specifiers"));
10012 specs
->typespec_word
= cts_bool
;
10013 specs
->locations
[cdw_typespec
] = loc
;
10019 ("both %<long%> and %<char%> in "
10020 "declaration specifiers"));
10021 else if (specs
->short_p
)
10023 ("both %<short%> and %<char%> in "
10024 "declaration specifiers"));
10025 else if (specs
->saturating_p
)
10027 ("both %<_Sat%> and %<char%> in "
10028 "declaration specifiers"));
10031 specs
->typespec_word
= cts_char
;
10032 specs
->locations
[cdw_typespec
] = loc
;
10036 if (specs
->saturating_p
)
10038 ("both %<_Sat%> and %<int%> in "
10039 "declaration specifiers"));
10042 specs
->typespec_word
= cts_int
;
10043 specs
->locations
[cdw_typespec
] = loc
;
10049 ("both %<long%> and %<float%> in "
10050 "declaration specifiers"));
10051 else if (specs
->short_p
)
10053 ("both %<short%> and %<float%> in "
10054 "declaration specifiers"));
10055 else if (specs
->signed_p
)
10057 ("both %<signed%> and %<float%> in "
10058 "declaration specifiers"));
10059 else if (specs
->unsigned_p
)
10061 ("both %<unsigned%> and %<float%> in "
10062 "declaration specifiers"));
10063 else if (specs
->saturating_p
)
10065 ("both %<_Sat%> and %<float%> in "
10066 "declaration specifiers"));
10069 specs
->typespec_word
= cts_float
;
10070 specs
->locations
[cdw_typespec
] = loc
;
10074 if (specs
->long_long_p
)
10076 ("both %<long long%> and %<double%> in "
10077 "declaration specifiers"));
10078 else if (specs
->short_p
)
10080 ("both %<short%> and %<double%> in "
10081 "declaration specifiers"));
10082 else if (specs
->signed_p
)
10084 ("both %<signed%> and %<double%> in "
10085 "declaration specifiers"));
10086 else if (specs
->unsigned_p
)
10088 ("both %<unsigned%> and %<double%> in "
10089 "declaration specifiers"));
10090 else if (specs
->saturating_p
)
10092 ("both %<_Sat%> and %<double%> in "
10093 "declaration specifiers"));
10096 specs
->typespec_word
= cts_double
;
10097 specs
->locations
[cdw_typespec
] = loc
;
10102 case RID_DFLOAT128
:
10105 if (i
== RID_DFLOAT32
)
10106 str
= "_Decimal32";
10107 else if (i
== RID_DFLOAT64
)
10108 str
= "_Decimal64";
10110 str
= "_Decimal128";
10111 if (specs
->long_long_p
)
10113 ("both %<long long%> and %<%s%> in "
10114 "declaration specifiers"),
10118 ("both %<long%> and %<%s%> in "
10119 "declaration specifiers"),
10121 else if (specs
->short_p
)
10123 ("both %<short%> and %<%s%> in "
10124 "declaration specifiers"),
10126 else if (specs
->signed_p
)
10128 ("both %<signed%> and %<%s%> in "
10129 "declaration specifiers"),
10131 else if (specs
->unsigned_p
)
10133 ("both %<unsigned%> and %<%s%> in "
10134 "declaration specifiers"),
10136 else if (specs
->complex_p
)
10138 ("both %<complex%> and %<%s%> in "
10139 "declaration specifiers"),
10141 else if (specs
->saturating_p
)
10143 ("both %<_Sat%> and %<%s%> in "
10144 "declaration specifiers"),
10146 else if (i
== RID_DFLOAT32
)
10147 specs
->typespec_word
= cts_dfloat32
;
10148 else if (i
== RID_DFLOAT64
)
10149 specs
->typespec_word
= cts_dfloat64
;
10151 specs
->typespec_word
= cts_dfloat128
;
10152 specs
->locations
[cdw_typespec
] = loc
;
10154 if (!targetm
.decimal_float_supported_p ())
10156 ("decimal floating point not supported "
10157 "for this target"));
10158 pedwarn (loc
, OPT_Wpedantic
,
10159 "ISO C does not support decimal floating point");
10165 if (i
== RID_FRACT
)
10169 if (specs
->complex_p
)
10171 ("both %<complex%> and %<%s%> in "
10172 "declaration specifiers"),
10174 else if (i
== RID_FRACT
)
10175 specs
->typespec_word
= cts_fract
;
10177 specs
->typespec_word
= cts_accum
;
10178 specs
->locations
[cdw_typespec
] = loc
;
10180 if (!targetm
.fixed_point_supported_p ())
10182 "fixed-point types not supported for this target");
10183 pedwarn (loc
, OPT_Wpedantic
,
10184 "ISO C does not support fixed-point types");
10187 /* ObjC reserved word "id", handled below. */
10193 /* Now we have a typedef (a TYPE_DECL node), an identifier (some
10194 form of ObjC type, cases such as "int" and "long" being handled
10195 above), a TYPE (struct, union, enum and typeof specifiers) or an
10196 ERROR_MARK. In none of these cases may there have previously
10197 been any type specifiers. */
10198 if (specs
->type
|| specs
->typespec_word
!= cts_none
10199 || specs
->long_p
|| specs
->short_p
|| specs
->signed_p
10200 || specs
->unsigned_p
|| specs
->complex_p
)
10201 error_at (loc
, "two or more data types in declaration specifiers");
10202 else if (TREE_CODE (type
) == TYPE_DECL
)
10204 if (TREE_TYPE (type
) == error_mark_node
)
10205 ; /* Allow the type to default to int to avoid cascading errors. */
10208 specs
->type
= TREE_TYPE (type
);
10209 specs
->decl_attr
= DECL_ATTRIBUTES (type
);
10210 specs
->typedef_p
= true;
10211 specs
->explicit_signed_p
= C_TYPEDEF_EXPLICITLY_SIGNED (type
);
10212 specs
->locations
[cdw_typedef
] = loc
;
10214 /* If this typedef name is defined in a struct, then a C++
10215 lookup would return a different value. */
10216 if (warn_cxx_compat
10217 && I_SYMBOL_BINDING (DECL_NAME (type
))->in_struct
)
10218 warning_at (loc
, OPT_Wc___compat
,
10219 "C++ lookup of %qD would return a field, not a type",
10222 /* If we are parsing a struct, record that a struct field
10224 if (warn_cxx_compat
&& struct_parse_info
!= NULL
)
10225 struct_parse_info
->typedefs_seen
.safe_push (type
);
10228 else if (TREE_CODE (type
) == IDENTIFIER_NODE
)
10230 tree t
= lookup_name (type
);
10231 if (!t
|| TREE_CODE (t
) != TYPE_DECL
)
10232 error_at (loc
, "%qE fails to be a typedef or built in type", type
);
10233 else if (TREE_TYPE (t
) == error_mark_node
)
10237 specs
->type
= TREE_TYPE (t
);
10238 specs
->locations
[cdw_typespec
] = loc
;
10243 if (TREE_CODE (type
) != ERROR_MARK
&& spec
.kind
== ctsk_typeof
)
10245 specs
->typedef_p
= true;
10246 specs
->locations
[cdw_typedef
] = loc
;
10250 specs
->expr
= build2 (COMPOUND_EXPR
, TREE_TYPE (spec
.expr
),
10251 specs
->expr
, spec
.expr
);
10253 specs
->expr
= spec
.expr
;
10254 specs
->expr_const_operands
&= spec
.expr_const_operands
;
10257 specs
->type
= type
;
10263 /* Add the storage class specifier or function specifier SCSPEC to the
10264 declaration specifiers SPECS, returning SPECS. */
10266 struct c_declspecs
*
10267 declspecs_add_scspec (source_location loc
,
10268 struct c_declspecs
*specs
,
10272 enum c_storage_class n
= csc_none
;
10274 specs
->declspecs_seen_p
= true;
10275 gcc_assert (TREE_CODE (scspec
) == IDENTIFIER_NODE
10276 && C_IS_RESERVED_WORD (scspec
));
10277 i
= C_RID_CODE (scspec
);
10278 if (specs
->non_sc_seen_p
)
10279 warning (OPT_Wold_style_declaration
,
10280 "%qE is not at beginning of declaration", scspec
);
10284 /* C99 permits duplicate inline. Although of doubtful utility,
10285 it seems simplest to permit it in gnu89 mode as well, as
10286 there is also little utility in maintaining this as a
10287 difference between gnu89 and C99 inline. */
10289 specs
->inline_p
= true;
10290 specs
->locations
[cdw_inline
] = loc
;
10293 /* Duplicate _Noreturn is permitted. */
10295 specs
->noreturn_p
= true;
10296 specs
->locations
[cdw_noreturn
] = loc
;
10299 dupe
= specs
->thread_p
;
10300 if (specs
->storage_class
== csc_auto
)
10301 error ("%qE used with %<auto%>", scspec
);
10302 else if (specs
->storage_class
== csc_register
)
10303 error ("%qE used with %<register%>", scspec
);
10304 else if (specs
->storage_class
== csc_typedef
)
10305 error ("%qE used with %<typedef%>", scspec
);
10308 specs
->thread_p
= true;
10309 specs
->thread_gnu_p
= (strcmp (IDENTIFIER_POINTER (scspec
),
10311 /* A diagnostic is not required for the use of this
10312 identifier in the implementation namespace; only diagnose
10313 it for the C11 spelling because of existing code using
10314 the other spelling. */
10315 if (!specs
->thread_gnu_p
)
10318 pedwarn_c99 (loc
, OPT_Wpedantic
,
10319 "ISO C99 does not support %qE", scspec
);
10321 pedwarn_c99 (loc
, OPT_Wpedantic
,
10322 "ISO C90 does not support %qE", scspec
);
10324 specs
->locations
[cdw_thread
] = loc
;
10332 /* Diagnose "__thread extern". */
10333 if (specs
->thread_p
&& specs
->thread_gnu_p
)
10334 error ("%<__thread%> before %<extern%>");
10341 /* Diagnose "__thread static". */
10342 if (specs
->thread_p
&& specs
->thread_gnu_p
)
10343 error ("%<__thread%> before %<static%>");
10349 gcc_unreachable ();
10351 if (n
!= csc_none
&& n
== specs
->storage_class
)
10355 if (i
== RID_THREAD
)
10356 error ("duplicate %<_Thread_local%> or %<__thread%>");
10358 error ("duplicate %qE", scspec
);
10362 if (specs
->storage_class
!= csc_none
&& n
!= specs
->storage_class
)
10364 error ("multiple storage classes in declaration specifiers");
10368 specs
->storage_class
= n
;
10369 specs
->locations
[cdw_storage_class
] = loc
;
10370 if (n
!= csc_extern
&& n
!= csc_static
&& specs
->thread_p
)
10372 error ("%qs used with %qE",
10373 specs
->thread_gnu_p
? "__thread" : "_Thread_local",
10375 specs
->thread_p
= false;
10382 /* Add the attributes ATTRS to the declaration specifiers SPECS,
10383 returning SPECS. */
10385 struct c_declspecs
*
10386 declspecs_add_attrs (source_location loc
, struct c_declspecs
*specs
, tree attrs
)
10388 specs
->attrs
= chainon (attrs
, specs
->attrs
);
10389 specs
->locations
[cdw_attributes
] = loc
;
10390 specs
->declspecs_seen_p
= true;
10394 /* Add an _Alignas specifier (expression ALIGN, or type whose
10395 alignment is ALIGN) to the declaration specifiers SPECS, returning
10397 struct c_declspecs
*
10398 declspecs_add_alignas (source_location loc
,
10399 struct c_declspecs
*specs
, tree align
)
10402 specs
->alignas_p
= true;
10403 specs
->locations
[cdw_alignas
] = loc
;
10404 if (align
== error_mark_node
)
10406 align_log
= check_user_alignment (align
, true);
10407 if (align_log
> specs
->align_log
)
10408 specs
->align_log
= align_log
;
10412 /* Combine "long", "short", "signed", "unsigned" and "_Complex" type
10413 specifiers with any other type specifier to determine the resulting
10414 type. This is where ISO C checks on complex types are made, since
10415 "_Complex long" is a prefix of the valid ISO C type "_Complex long
10418 struct c_declspecs
*
10419 finish_declspecs (struct c_declspecs
*specs
)
10421 /* If a type was specified as a whole, we have no modifiers and are
10423 if (specs
->type
!= NULL_TREE
)
10425 gcc_assert (!specs
->long_p
&& !specs
->long_long_p
&& !specs
->short_p
10426 && !specs
->signed_p
&& !specs
->unsigned_p
10427 && !specs
->complex_p
);
10429 /* Set a dummy type. */
10430 if (TREE_CODE (specs
->type
) == ERROR_MARK
)
10431 specs
->type
= integer_type_node
;
10435 /* If none of "void", "_Bool", "char", "int", "float" or "double"
10436 has been specified, treat it as "int" unless "_Complex" is
10437 present and there are no other specifiers. If we just have
10438 "_Complex", it is equivalent to "_Complex double", but e.g.
10439 "_Complex short" is equivalent to "_Complex short int". */
10440 if (specs
->typespec_word
== cts_none
)
10442 if (specs
->saturating_p
)
10444 error_at (specs
->locations
[cdw_saturating
],
10445 "%<_Sat%> is used without %<_Fract%> or %<_Accum%>");
10446 if (!targetm
.fixed_point_supported_p ())
10447 error_at (specs
->locations
[cdw_saturating
],
10448 "fixed-point types not supported for this target");
10449 specs
->typespec_word
= cts_fract
;
10451 else if (specs
->long_p
|| specs
->short_p
10452 || specs
->signed_p
|| specs
->unsigned_p
)
10454 specs
->typespec_word
= cts_int
;
10456 else if (specs
->complex_p
)
10458 specs
->typespec_word
= cts_double
;
10459 pedwarn (specs
->locations
[cdw_complex
], OPT_Wpedantic
,
10460 "ISO C does not support plain %<complex%> meaning "
10461 "%<double complex%>");
10465 specs
->typespec_word
= cts_int
;
10466 specs
->default_int_p
= true;
10467 /* We don't diagnose this here because grokdeclarator will
10468 give more specific diagnostics according to whether it is
10469 a function definition. */
10473 /* If "signed" was specified, record this to distinguish "int" and
10474 "signed int" in the case of a bit-field with
10475 -funsigned-bitfields. */
10476 specs
->explicit_signed_p
= specs
->signed_p
;
10478 /* Now compute the actual type. */
10479 switch (specs
->typespec_word
)
10481 case cts_auto_type
:
10482 gcc_assert (!specs
->long_p
&& !specs
->short_p
10483 && !specs
->signed_p
&& !specs
->unsigned_p
10484 && !specs
->complex_p
);
10485 /* Type to be filled in later. */
10488 gcc_assert (!specs
->long_p
&& !specs
->short_p
10489 && !specs
->signed_p
&& !specs
->unsigned_p
10490 && !specs
->complex_p
);
10491 specs
->type
= void_type_node
;
10494 gcc_assert (!specs
->long_p
&& !specs
->short_p
10495 && !specs
->signed_p
&& !specs
->unsigned_p
10496 && !specs
->complex_p
);
10497 specs
->type
= boolean_type_node
;
10500 gcc_assert (!specs
->long_p
&& !specs
->short_p
);
10501 gcc_assert (!(specs
->signed_p
&& specs
->unsigned_p
));
10502 if (specs
->signed_p
)
10503 specs
->type
= signed_char_type_node
;
10504 else if (specs
->unsigned_p
)
10505 specs
->type
= unsigned_char_type_node
;
10507 specs
->type
= char_type_node
;
10508 if (specs
->complex_p
)
10510 pedwarn (specs
->locations
[cdw_complex
], OPT_Wpedantic
,
10511 "ISO C does not support complex integer types");
10512 specs
->type
= build_complex_type (specs
->type
);
10516 gcc_assert (!specs
->long_p
&& !specs
->short_p
&& !specs
->long_long_p
);
10517 gcc_assert (!(specs
->signed_p
&& specs
->unsigned_p
));
10518 specs
->type
= (specs
->unsigned_p
10519 ? int_n_trees
[specs
->int_n_idx
].unsigned_type
10520 : int_n_trees
[specs
->int_n_idx
].signed_type
);
10521 if (specs
->complex_p
)
10523 pedwarn (specs
->locations
[cdw_complex
], OPT_Wpedantic
,
10524 "ISO C does not support complex integer types");
10525 specs
->type
= build_complex_type (specs
->type
);
10529 gcc_assert (!(specs
->long_p
&& specs
->short_p
));
10530 gcc_assert (!(specs
->signed_p
&& specs
->unsigned_p
));
10531 if (specs
->long_long_p
)
10532 specs
->type
= (specs
->unsigned_p
10533 ? long_long_unsigned_type_node
10534 : long_long_integer_type_node
);
10535 else if (specs
->long_p
)
10536 specs
->type
= (specs
->unsigned_p
10537 ? long_unsigned_type_node
10538 : long_integer_type_node
);
10539 else if (specs
->short_p
)
10540 specs
->type
= (specs
->unsigned_p
10541 ? short_unsigned_type_node
10542 : short_integer_type_node
);
10544 specs
->type
= (specs
->unsigned_p
10545 ? unsigned_type_node
10546 : integer_type_node
);
10547 if (specs
->complex_p
)
10549 pedwarn (specs
->locations
[cdw_complex
], OPT_Wpedantic
,
10550 "ISO C does not support complex integer types");
10551 specs
->type
= build_complex_type (specs
->type
);
10555 gcc_assert (!specs
->long_p
&& !specs
->short_p
10556 && !specs
->signed_p
&& !specs
->unsigned_p
);
10557 specs
->type
= (specs
->complex_p
10558 ? complex_float_type_node
10559 : float_type_node
);
10562 gcc_assert (!specs
->long_long_p
&& !specs
->short_p
10563 && !specs
->signed_p
&& !specs
->unsigned_p
);
10566 specs
->type
= (specs
->complex_p
10567 ? complex_long_double_type_node
10568 : long_double_type_node
);
10572 specs
->type
= (specs
->complex_p
10573 ? complex_double_type_node
10574 : double_type_node
);
10579 case cts_dfloat128
:
10580 gcc_assert (!specs
->long_p
&& !specs
->long_long_p
&& !specs
->short_p
10581 && !specs
->signed_p
&& !specs
->unsigned_p
&& !specs
->complex_p
);
10582 if (specs
->typespec_word
== cts_dfloat32
)
10583 specs
->type
= dfloat32_type_node
;
10584 else if (specs
->typespec_word
== cts_dfloat64
)
10585 specs
->type
= dfloat64_type_node
;
10587 specs
->type
= dfloat128_type_node
;
10590 gcc_assert (!specs
->complex_p
);
10591 if (!targetm
.fixed_point_supported_p ())
10592 specs
->type
= integer_type_node
;
10593 else if (specs
->saturating_p
)
10595 if (specs
->long_long_p
)
10596 specs
->type
= specs
->unsigned_p
10597 ? sat_unsigned_long_long_fract_type_node
10598 : sat_long_long_fract_type_node
;
10599 else if (specs
->long_p
)
10600 specs
->type
= specs
->unsigned_p
10601 ? sat_unsigned_long_fract_type_node
10602 : sat_long_fract_type_node
;
10603 else if (specs
->short_p
)
10604 specs
->type
= specs
->unsigned_p
10605 ? sat_unsigned_short_fract_type_node
10606 : sat_short_fract_type_node
;
10608 specs
->type
= specs
->unsigned_p
10609 ? sat_unsigned_fract_type_node
10610 : sat_fract_type_node
;
10614 if (specs
->long_long_p
)
10615 specs
->type
= specs
->unsigned_p
10616 ? unsigned_long_long_fract_type_node
10617 : long_long_fract_type_node
;
10618 else if (specs
->long_p
)
10619 specs
->type
= specs
->unsigned_p
10620 ? unsigned_long_fract_type_node
10621 : long_fract_type_node
;
10622 else if (specs
->short_p
)
10623 specs
->type
= specs
->unsigned_p
10624 ? unsigned_short_fract_type_node
10625 : short_fract_type_node
;
10627 specs
->type
= specs
->unsigned_p
10628 ? unsigned_fract_type_node
10633 gcc_assert (!specs
->complex_p
);
10634 if (!targetm
.fixed_point_supported_p ())
10635 specs
->type
= integer_type_node
;
10636 else if (specs
->saturating_p
)
10638 if (specs
->long_long_p
)
10639 specs
->type
= specs
->unsigned_p
10640 ? sat_unsigned_long_long_accum_type_node
10641 : sat_long_long_accum_type_node
;
10642 else if (specs
->long_p
)
10643 specs
->type
= specs
->unsigned_p
10644 ? sat_unsigned_long_accum_type_node
10645 : sat_long_accum_type_node
;
10646 else if (specs
->short_p
)
10647 specs
->type
= specs
->unsigned_p
10648 ? sat_unsigned_short_accum_type_node
10649 : sat_short_accum_type_node
;
10651 specs
->type
= specs
->unsigned_p
10652 ? sat_unsigned_accum_type_node
10653 : sat_accum_type_node
;
10657 if (specs
->long_long_p
)
10658 specs
->type
= specs
->unsigned_p
10659 ? unsigned_long_long_accum_type_node
10660 : long_long_accum_type_node
;
10661 else if (specs
->long_p
)
10662 specs
->type
= specs
->unsigned_p
10663 ? unsigned_long_accum_type_node
10664 : long_accum_type_node
;
10665 else if (specs
->short_p
)
10666 specs
->type
= specs
->unsigned_p
10667 ? unsigned_short_accum_type_node
10668 : short_accum_type_node
;
10670 specs
->type
= specs
->unsigned_p
10671 ? unsigned_accum_type_node
10676 gcc_unreachable ();
10682 /* A subroutine of c_write_global_declarations. Perform final processing
10683 on one file scope's declarations (or the external scope's declarations),
10687 c_write_global_declarations_1 (tree globals
)
10692 /* Process the decls in the order they were written. */
10693 for (decl
= globals
; decl
; decl
= DECL_CHAIN (decl
))
10695 /* Check for used but undefined static functions using the C
10696 standard's definition of "used", and set TREE_NO_WARNING so
10697 that check_global_declarations doesn't repeat the check. */
10698 if (TREE_CODE (decl
) == FUNCTION_DECL
10699 && DECL_INITIAL (decl
) == 0
10700 && DECL_EXTERNAL (decl
)
10701 && !TREE_PUBLIC (decl
)
10702 && C_DECL_USED (decl
))
10704 pedwarn (input_location
, 0, "%q+F used but never defined", decl
);
10705 TREE_NO_WARNING (decl
) = 1;
10708 wrapup_global_declaration_1 (decl
);
10713 reconsider
= false;
10714 for (decl
= globals
; decl
; decl
= DECL_CHAIN (decl
))
10715 reconsider
|= wrapup_global_declaration_2 (decl
);
10717 while (reconsider
);
10719 for (decl
= globals
; decl
; decl
= DECL_CHAIN (decl
))
10720 check_global_declaration_1 (decl
);
10723 /* A subroutine of c_write_global_declarations Emit debug information for each
10724 of the declarations in GLOBALS. */
10727 c_write_global_declarations_2 (tree globals
)
10731 for (decl
= globals
; decl
; decl
= DECL_CHAIN (decl
))
10732 debug_hooks
->global_decl (decl
);
10735 /* Callback to collect a source_ref from a DECL. */
10738 collect_source_ref_cb (tree decl
)
10740 if (!DECL_IS_BUILTIN (decl
))
10741 collect_source_ref (LOCATION_FILE (decl_sloc (decl
, false)));
10744 /* Preserve the external declarations scope across a garbage collect. */
10745 static GTY(()) tree ext_block
;
10747 /* Collect all references relevant to SOURCE_FILE. */
10750 collect_all_refs (const char *source_file
)
10755 FOR_EACH_VEC_ELT (*all_translation_units
, i
, t
)
10756 collect_ada_nodes (BLOCK_VARS (DECL_INITIAL (t
)), source_file
);
10758 collect_ada_nodes (BLOCK_VARS (ext_block
), source_file
);
10761 /* Iterate over all global declarations and call CALLBACK. */
10764 for_each_global_decl (void (*callback
) (tree decl
))
10771 FOR_EACH_VEC_ELT (*all_translation_units
, i
, t
)
10773 decls
= DECL_INITIAL (t
);
10774 for (decl
= BLOCK_VARS (decls
); decl
; decl
= TREE_CHAIN (decl
))
10778 for (decl
= BLOCK_VARS (ext_block
); decl
; decl
= TREE_CHAIN (decl
))
10783 c_write_global_declarations (void)
10788 /* We don't want to do this if generating a PCH. */
10792 timevar_start (TV_PHASE_DEFERRED
);
10794 /* Do the Objective-C stuff. This is where all the Objective-C
10795 module stuff gets generated (symtab, class/protocol/selector
10797 if (c_dialect_objc ())
10798 objc_write_global_declarations ();
10800 /* Close the external scope. */
10801 ext_block
= pop_scope ();
10802 external_scope
= 0;
10803 gcc_assert (!current_scope
);
10805 /* Handle -fdump-ada-spec[-slim]. */
10806 if (flag_dump_ada_spec
|| flag_dump_ada_spec_slim
)
10808 /* Build a table of files to generate specs for */
10809 if (flag_dump_ada_spec_slim
)
10810 collect_source_ref (main_input_filename
);
10812 for_each_global_decl (collect_source_ref_cb
);
10814 dump_ada_specs (collect_all_refs
, NULL
);
10819 tree tmp
= BLOCK_VARS (ext_block
);
10821 FILE * stream
= dump_begin (TDI_tu
, &flags
);
10824 dump_node (tmp
, flags
& ~TDF_SLIM
, stream
);
10825 dump_end (TDI_tu
, stream
);
10829 /* Process all file scopes in this compilation, and the external_scope,
10830 through wrapup_global_declarations and check_global_declarations. */
10831 FOR_EACH_VEC_ELT (*all_translation_units
, i
, t
)
10832 c_write_global_declarations_1 (BLOCK_VARS (DECL_INITIAL (t
)));
10833 c_write_global_declarations_1 (BLOCK_VARS (ext_block
));
10835 timevar_stop (TV_PHASE_DEFERRED
);
10836 timevar_start (TV_PHASE_OPT_GEN
);
10838 /* We're done parsing; proceed to optimize and emit assembly.
10839 FIXME: shouldn't be the front end's responsibility to call this. */
10840 symtab
->finalize_compilation_unit ();
10842 timevar_stop (TV_PHASE_OPT_GEN
);
10843 timevar_start (TV_PHASE_DBGINFO
);
10845 /* After cgraph has had a chance to emit everything that's going to
10846 be emitted, output debug information for globals. */
10847 if (!seen_error ())
10849 timevar_push (TV_SYMOUT
);
10850 FOR_EACH_VEC_ELT (*all_translation_units
, i
, t
)
10851 c_write_global_declarations_2 (BLOCK_VARS (DECL_INITIAL (t
)));
10852 c_write_global_declarations_2 (BLOCK_VARS (ext_block
));
10853 timevar_pop (TV_SYMOUT
);
10857 timevar_stop (TV_PHASE_DBGINFO
);
10860 /* Register reserved keyword WORD as qualifier for address space AS. */
10863 c_register_addr_space (const char *word
, addr_space_t as
)
10865 int rid
= RID_FIRST_ADDR_SPACE
+ as
;
10868 /* Address space qualifiers are only supported
10869 in C with GNU extensions enabled. */
10870 if (c_dialect_objc () || flag_no_asm
)
10873 id
= get_identifier (word
);
10874 C_SET_RID_CODE (id
, rid
);
10875 C_IS_RESERVED_WORD (id
) = 1;
10876 ridpointers
[rid
] = id
;
10879 /* Return identifier to look up for omp declare reduction. */
10882 c_omp_reduction_id (enum tree_code reduction_code
, tree reduction_id
)
10884 const char *p
= NULL
;
10885 switch (reduction_code
)
10887 case PLUS_EXPR
: p
= "+"; break;
10888 case MULT_EXPR
: p
= "*"; break;
10889 case MINUS_EXPR
: p
= "-"; break;
10890 case BIT_AND_EXPR
: p
= "&"; break;
10891 case BIT_XOR_EXPR
: p
= "^"; break;
10892 case BIT_IOR_EXPR
: p
= "|"; break;
10893 case TRUTH_ANDIF_EXPR
: p
= "&&"; break;
10894 case TRUTH_ORIF_EXPR
: p
= "||"; break;
10895 case MIN_EXPR
: p
= "min"; break;
10896 case MAX_EXPR
: p
= "max"; break;
10903 if (TREE_CODE (reduction_id
) != IDENTIFIER_NODE
)
10904 return error_mark_node
;
10905 p
= IDENTIFIER_POINTER (reduction_id
);
10908 const char prefix
[] = "omp declare reduction ";
10909 size_t lenp
= sizeof (prefix
);
10910 size_t len
= strlen (p
);
10911 char *name
= XALLOCAVEC (char, lenp
+ len
);
10912 memcpy (name
, prefix
, lenp
- 1);
10913 memcpy (name
+ lenp
- 1, p
, len
+ 1);
10914 return get_identifier (name
);
10917 /* Lookup REDUCTION_ID in the current scope, or create an artificial
10918 VAR_DECL, bind it into the current scope and return it. */
10921 c_omp_reduction_decl (tree reduction_id
)
10923 struct c_binding
*b
= I_SYMBOL_BINDING (reduction_id
);
10924 if (b
!= NULL
&& B_IN_CURRENT_SCOPE (b
))
10927 tree decl
= build_decl (BUILTINS_LOCATION
, VAR_DECL
,
10928 reduction_id
, integer_type_node
);
10929 DECL_ARTIFICIAL (decl
) = 1;
10930 DECL_EXTERNAL (decl
) = 1;
10931 TREE_STATIC (decl
) = 1;
10932 TREE_PUBLIC (decl
) = 0;
10933 bind (reduction_id
, decl
, current_scope
, true, false, BUILTINS_LOCATION
);
10937 /* Lookup REDUCTION_ID in the first scope where it has entry for TYPE. */
10940 c_omp_reduction_lookup (tree reduction_id
, tree type
)
10942 struct c_binding
*b
= I_SYMBOL_BINDING (reduction_id
);
10946 for (t
= DECL_INITIAL (b
->decl
); t
; t
= TREE_CHAIN (t
))
10947 if (comptypes (TREE_PURPOSE (t
), type
))
10948 return TREE_VALUE (t
);
10951 return error_mark_node
;
10954 /* Helper function called via walk_tree, to diagnose invalid
10955 #pragma omp declare reduction combiners or initializers. */
10958 c_check_omp_declare_reduction_r (tree
*tp
, int *, void *data
)
10960 tree
*vars
= (tree
*) data
;
10961 if (SSA_VAR_P (*tp
)
10962 && !DECL_ARTIFICIAL (*tp
)
10966 location_t loc
= DECL_SOURCE_LOCATION (vars
[0]);
10967 if (strcmp (IDENTIFIER_POINTER (DECL_NAME (vars
[0])), "omp_out") == 0)
10968 error_at (loc
, "%<#pragma omp declare reduction%> combiner refers to "
10969 "variable %qD which is not %<omp_out%> nor %<omp_in%>",
10972 error_at (loc
, "%<#pragma omp declare reduction%> initializer refers "
10973 "to variable %qD which is not %<omp_priv%> nor "
10981 #include "gt-c-c-decl.h"