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"
38 #include "double-int.h"
42 #include "fold-const.h"
43 #include "print-tree.h"
44 #include "stor-layout.h"
47 #include "stringpool.h"
48 #include "tree-inline.h"
54 #include "hard-reg-set.h"
64 #include "c-family/c-common.h"
65 #include "c-family/c-objc.h"
66 #include "c-family/c-pragma.h"
67 #include "c-family/c-ubsan.h"
69 #include "langhooks.h"
70 #include "tree-iterator.h"
71 #include "diagnostic-core.h"
75 #include "plugin-api.h"
78 #include "hash-table.h"
79 #include "langhooks-def.h"
81 #include "c-family/c-ada-spec.h"
85 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
87 { NORMAL
, /* Ordinary declaration */
88 FUNCDEF
, /* Function definition */
89 PARM
, /* Declaration of parm before function body */
90 FIELD
, /* Declaration inside struct or union */
91 TYPENAME
}; /* Typename (inside cast or sizeof) */
93 /* States indicating how grokdeclarator() should handle declspecs marked
94 with __attribute__((deprecated)). An object declared as
95 __attribute__((deprecated)) suppresses warnings of uses of other
98 enum deprecated_states
{
104 /* Nonzero if we have seen an invalid cross reference
105 to a struct, union, or enum, but not yet printed the message. */
106 tree pending_invalid_xref
;
108 /* File and line to appear in the eventual error message. */
109 location_t pending_invalid_xref_location
;
111 /* The file and line that the prototype came from if this is an
112 old-style definition; used for diagnostics in
113 store_parm_decls_oldstyle. */
115 static location_t current_function_prototype_locus
;
117 /* Whether this prototype was built-in. */
119 static bool current_function_prototype_built_in
;
121 /* The argument type information of this prototype. */
123 static tree current_function_prototype_arg_types
;
125 /* The argument information structure for the function currently being
128 static struct c_arg_info
*current_function_arg_info
;
130 /* The obstack on which parser and related data structures, which are
131 not live beyond their top-level declaration or definition, are
133 struct obstack parser_obstack
;
135 /* The current statement tree. */
137 static GTY(()) struct stmt_tree_s c_stmt_tree
;
139 /* State saving variables. */
143 /* A list of decls to be made automatically visible in each file scope. */
144 static GTY(()) tree visible_builtins
;
146 /* Set to 0 at beginning of a function definition, set to 1 if
147 a return statement that specifies a return value is seen. */
149 int current_function_returns_value
;
151 /* Set to 0 at beginning of a function definition, set to 1 if
152 a return statement with no argument is seen. */
154 int current_function_returns_null
;
156 /* Set to 0 at beginning of a function definition, set to 1 if
157 a call to a noreturn function is seen. */
159 int current_function_returns_abnormally
;
161 /* Set to nonzero by `grokdeclarator' for a function
162 whose return type is defaulted, if warnings for this are desired. */
164 static int warn_about_return_type
;
166 /* Nonzero when the current toplevel function contains a declaration
167 of a nested function which is never defined. */
169 static bool undef_nested_function
;
171 /* Mode used to build pointers (VOIDmode means ptr_mode). */
173 machine_mode c_default_pointer_mode
= VOIDmode
;
175 /* If non-zero, implicit "omp declare target" attribute is added into the
177 int current_omp_declare_target_attribute
;
179 /* Each c_binding structure describes one binding of an identifier to
180 a decl. All the decls in a scope - irrespective of namespace - are
181 chained together by the ->prev field, which (as the name implies)
182 runs in reverse order. All the decls in a given namespace bound to
183 a given identifier are chained by the ->shadowed field, which runs
184 from inner to outer scopes.
186 The ->decl field usually points to a DECL node, but there are two
187 exceptions. In the namespace of type tags, the bound entity is a
188 RECORD_TYPE, UNION_TYPE, or ENUMERAL_TYPE node. If an undeclared
189 identifier is encountered, it is bound to error_mark_node to
190 suppress further errors about that identifier in the current
193 The ->u.type field stores the type of the declaration in this scope;
194 if NULL, the type is the type of the ->decl field. This is only of
195 relevance for objects with external or internal linkage which may
196 be redeclared in inner scopes, forming composite types that only
197 persist for the duration of those scopes. In the external scope,
198 this stores the composite of all the types declared for this
199 object, visible or not. The ->inner_comp field (used only at file
200 scope) stores whether an incomplete array type at file scope was
201 completed at an inner scope to an array size other than 1.
203 The ->u.label field is used for labels. It points to a structure
204 which stores additional information used for warnings.
206 The depth field is copied from the scope structure that holds this
207 decl. It is used to preserve the proper ordering of the ->shadowed
208 field (see bind()) and also for a handful of special-case checks.
209 Finally, the invisible bit is true for a decl which should be
210 ignored for purposes of normal name lookup, and the nested bit is
211 true for a decl that's been bound a second time in an inner scope;
212 in all such cases, the binding in the outer scope will have its
213 invisible bit true. */
215 struct GTY((chain_next ("%h.prev"))) c_binding
{
216 union GTY(()) { /* first so GTY desc can use decl */
217 tree
GTY((tag ("0"))) type
; /* the type in this scope */
218 struct c_label_vars
* GTY((tag ("1"))) label
; /* for warnings */
219 } GTY((desc ("TREE_CODE (%0.decl) == LABEL_DECL"))) u
;
220 tree decl
; /* the decl bound */
221 tree id
; /* the identifier it's bound to */
222 struct c_binding
*prev
; /* the previous decl in this scope */
223 struct c_binding
*shadowed
; /* the innermost decl shadowed by this one */
224 unsigned int depth
: 28; /* depth of this scope */
225 BOOL_BITFIELD invisible
: 1; /* normal lookup should ignore this binding */
226 BOOL_BITFIELD nested
: 1; /* do not set DECL_CONTEXT when popping */
227 BOOL_BITFIELD inner_comp
: 1; /* incomplete array completed in inner scope */
228 BOOL_BITFIELD in_struct
: 1; /* currently defined as struct field */
229 location_t locus
; /* location for nested bindings */
231 #define B_IN_SCOPE(b1, b2) ((b1)->depth == (b2)->depth)
232 #define B_IN_CURRENT_SCOPE(b) ((b)->depth == current_scope->depth)
233 #define B_IN_FILE_SCOPE(b) ((b)->depth == 1 /*file_scope->depth*/)
234 #define B_IN_EXTERNAL_SCOPE(b) ((b)->depth == 0 /*external_scope->depth*/)
236 /* Each C symbol points to three linked lists of c_binding structures.
237 These describe the values of the identifier in the three different
238 namespaces defined by the language. */
240 struct GTY(()) lang_identifier
{
241 struct c_common_identifier common_id
;
242 struct c_binding
*symbol_binding
; /* vars, funcs, constants, typedefs */
243 struct c_binding
*tag_binding
; /* struct/union/enum tags */
244 struct c_binding
*label_binding
; /* labels */
247 /* Validate c-lang.c's assumptions. */
248 extern char C_SIZEOF_STRUCT_LANG_IDENTIFIER_isnt_accurate
249 [(sizeof(struct lang_identifier
) == C_SIZEOF_STRUCT_LANG_IDENTIFIER
) ? 1 : -1];
251 /* The binding oracle; see c-tree.h. */
252 void (*c_binding_oracle
) (enum c_oracle_request
, tree identifier
);
254 /* This flag is set on an identifier if we have previously asked the
255 binding oracle for this identifier's symbol binding. */
256 #define I_SYMBOL_CHECKED(node) \
257 (TREE_LANG_FLAG_4 (IDENTIFIER_NODE_CHECK (node)))
259 static inline struct c_binding
* *
260 i_symbol_binding (tree node
)
262 struct lang_identifier
*lid
263 = (struct lang_identifier
*) IDENTIFIER_NODE_CHECK (node
);
265 if (lid
->symbol_binding
== NULL
266 && c_binding_oracle
!= NULL
267 && !I_SYMBOL_CHECKED (node
))
269 /* Set the "checked" flag first, to avoid infinite recursion
270 when the binding oracle calls back into gcc. */
271 I_SYMBOL_CHECKED (node
) = 1;
272 c_binding_oracle (C_ORACLE_SYMBOL
, node
);
275 return &lid
->symbol_binding
;
278 #define I_SYMBOL_BINDING(node) (*i_symbol_binding (node))
280 #define I_SYMBOL_DECL(node) \
281 (I_SYMBOL_BINDING(node) ? I_SYMBOL_BINDING(node)->decl : 0)
283 /* This flag is set on an identifier if we have previously asked the
284 binding oracle for this identifier's tag binding. */
285 #define I_TAG_CHECKED(node) \
286 (TREE_LANG_FLAG_5 (IDENTIFIER_NODE_CHECK (node)))
288 static inline struct c_binding
**
289 i_tag_binding (tree node
)
291 struct lang_identifier
*lid
292 = (struct lang_identifier
*) IDENTIFIER_NODE_CHECK (node
);
294 if (lid
->tag_binding
== NULL
295 && c_binding_oracle
!= NULL
296 && !I_TAG_CHECKED (node
))
298 /* Set the "checked" flag first, to avoid infinite recursion
299 when the binding oracle calls back into gcc. */
300 I_TAG_CHECKED (node
) = 1;
301 c_binding_oracle (C_ORACLE_TAG
, node
);
304 return &lid
->tag_binding
;
307 #define I_TAG_BINDING(node) (*i_tag_binding (node))
309 #define I_TAG_DECL(node) \
310 (I_TAG_BINDING(node) ? I_TAG_BINDING(node)->decl : 0)
312 /* This flag is set on an identifier if we have previously asked the
313 binding oracle for this identifier's label binding. */
314 #define I_LABEL_CHECKED(node) \
315 (TREE_LANG_FLAG_6 (IDENTIFIER_NODE_CHECK (node)))
317 static inline struct c_binding
**
318 i_label_binding (tree node
)
320 struct lang_identifier
*lid
321 = (struct lang_identifier
*) IDENTIFIER_NODE_CHECK (node
);
323 if (lid
->label_binding
== NULL
324 && c_binding_oracle
!= NULL
325 && !I_LABEL_CHECKED (node
))
327 /* Set the "checked" flag first, to avoid infinite recursion
328 when the binding oracle calls back into gcc. */
329 I_LABEL_CHECKED (node
) = 1;
330 c_binding_oracle (C_ORACLE_LABEL
, node
);
333 return &lid
->label_binding
;
336 #define I_LABEL_BINDING(node) (*i_label_binding (node))
338 #define I_LABEL_DECL(node) \
339 (I_LABEL_BINDING(node) ? I_LABEL_BINDING(node)->decl : 0)
341 /* The resulting tree type. */
343 union GTY((desc ("TREE_CODE (&%h.generic) == IDENTIFIER_NODE"),
344 chain_next ("(union lang_tree_node *) c_tree_chain_next (&%h.generic)"))) lang_tree_node
346 union tree_node
GTY ((tag ("0"),
347 desc ("tree_node_structure (&%h)")))
349 struct lang_identifier
GTY ((tag ("1"))) identifier
;
352 /* Track bindings and other things that matter for goto warnings. For
353 efficiency, we do not gather all the decls at the point of
354 definition. Instead, we point into the bindings structure. As
355 scopes are popped, we update these structures and gather the decls
356 that matter at that time. */
358 struct GTY(()) c_spot_bindings
{
359 /* The currently open scope which holds bindings defined when the
360 label was defined or the goto statement was found. */
361 struct c_scope
*scope
;
362 /* The bindings in the scope field which were defined at the point
363 of the label or goto. This lets us look at older or newer
364 bindings in the scope, as appropriate. */
365 struct c_binding
*bindings_in_scope
;
366 /* The number of statement expressions that have started since this
367 label or goto statement was defined. This is zero if we are at
368 the same statement expression level. It is positive if we are in
369 a statement expression started since this spot. It is negative
370 if this spot was in a statement expression and we have left
373 /* Whether we started in a statement expression but are no longer in
374 it. This is set to true if stmt_exprs ever goes negative. */
378 /* This structure is used to keep track of bindings seen when a goto
379 statement is defined. This is only used if we see the goto
380 statement before we see the label. */
382 struct GTY(()) c_goto_bindings
{
383 /* The location of the goto statement. */
385 /* The bindings of the goto statement. */
386 struct c_spot_bindings goto_bindings
;
389 typedef struct c_goto_bindings
*c_goto_bindings_p
;
391 /* The additional information we keep track of for a label binding.
392 These fields are updated as scopes are popped. */
394 struct GTY(()) c_label_vars
{
395 /* The shadowed c_label_vars, when one label shadows another (which
396 can only happen using a __label__ declaration). */
397 struct c_label_vars
*shadowed
;
398 /* The bindings when the label was defined. */
399 struct c_spot_bindings label_bindings
;
400 /* A list of decls that we care about: decls about which we should
401 warn if a goto branches to this label from later in the function.
402 Decls are added to this list as scopes are popped. We only add
403 the decls that matter. */
404 vec
<tree
, va_gc
> *decls_in_scope
;
405 /* A list of goto statements to this label. This is only used for
406 goto statements seen before the label was defined, so that we can
407 issue appropriate warnings for them. */
408 vec
<c_goto_bindings_p
, va_gc
> *gotos
;
411 /* Each c_scope structure describes the complete contents of one
412 scope. Four scopes are distinguished specially: the innermost or
413 current scope, the innermost function scope, the file scope (always
414 the second to outermost) and the outermost or external scope.
416 Most declarations are recorded in the current scope.
418 All normal label declarations are recorded in the innermost
419 function scope, as are bindings of undeclared identifiers to
420 error_mark_node. (GCC permits nested functions as an extension,
421 hence the 'innermost' qualifier.) Explicitly declared labels
422 (using the __label__ extension) appear in the current scope.
424 Being in the file scope (current_scope == file_scope) causes
425 special behavior in several places below. Also, under some
426 conditions the Objective-C front end records declarations in the
427 file scope even though that isn't the current scope.
429 All declarations with external linkage are recorded in the external
430 scope, even if they aren't visible there; this models the fact that
431 such declarations are visible to the entire program, and (with a
432 bit of cleverness, see pushdecl) allows diagnosis of some violations
433 of C99 6.2.2p7 and 6.2.7p2:
435 If, within the same translation unit, the same identifier appears
436 with both internal and external linkage, the behavior is
439 All declarations that refer to the same object or function shall
440 have compatible type; otherwise, the behavior is undefined.
442 Initially only the built-in declarations, which describe compiler
443 intrinsic functions plus a subset of the standard library, are in
446 The order of the blocks list matters, and it is frequently appended
447 to. To avoid having to walk all the way to the end of the list on
448 each insertion, or reverse the list later, we maintain a pointer to
449 the last list entry. (FIXME: It should be feasible to use a reversed
452 The bindings list is strictly in reverse order of declarations;
453 pop_scope relies on this. */
456 struct GTY((chain_next ("%h.outer"))) c_scope
{
457 /* The scope containing this one. */
458 struct c_scope
*outer
;
460 /* The next outermost function scope. */
461 struct c_scope
*outer_function
;
463 /* All bindings in this scope. */
464 struct c_binding
*bindings
;
466 /* For each scope (except the global one), a chain of BLOCK nodes
467 for all the scopes that were entered and exited one level down. */
471 /* The depth of this scope. Used to keep the ->shadowed chain of
472 bindings sorted innermost to outermost. */
473 unsigned int depth
: 28;
475 /* True if we are currently filling this scope with parameter
477 BOOL_BITFIELD parm_flag
: 1;
479 /* True if we saw [*] in this scope. Used to give an error messages
480 if these appears in a function definition. */
481 BOOL_BITFIELD had_vla_unspec
: 1;
483 /* True if we already complained about forward parameter decls
484 in this scope. This prevents double warnings on
485 foo (int a; int b; ...) */
486 BOOL_BITFIELD warned_forward_parm_decls
: 1;
488 /* True if this is the outermost block scope of a function body.
489 This scope contains the parameters, the local variables declared
490 in the outermost block, and all the labels (except those in
491 nested functions, or declared at block scope with __label__). */
492 BOOL_BITFIELD function_body
: 1;
494 /* True means make a BLOCK for this scope no matter what. */
495 BOOL_BITFIELD keep
: 1;
497 /* True means that an unsuffixed float constant is _Decimal64. */
498 BOOL_BITFIELD float_const_decimal64
: 1;
500 /* True if this scope has any label bindings. This is used to speed
501 up searching for labels when popping scopes, particularly since
502 labels are normally only found at function scope. */
503 BOOL_BITFIELD has_label_bindings
: 1;
505 /* True if we should issue a warning if a goto statement crosses any
506 of the bindings. We still need to check the list of bindings to
507 find the specific ones we need to warn about. This is true if
508 decl_jump_unsafe would return true for any of the bindings. This
509 is used to avoid looping over all the bindings unnecessarily. */
510 BOOL_BITFIELD has_jump_unsafe_decl
: 1;
513 /* The scope currently in effect. */
515 static GTY(()) struct c_scope
*current_scope
;
517 /* The innermost function scope. Ordinary (not explicitly declared)
518 labels, bindings to error_mark_node, and the lazily-created
519 bindings of __func__ and its friends get this scope. */
521 static GTY(()) struct c_scope
*current_function_scope
;
523 /* The C file scope. This is reset for each input translation unit. */
525 static GTY(()) struct c_scope
*file_scope
;
527 /* The outermost scope. This is used for all declarations with
528 external linkage, and only these, hence the name. */
530 static GTY(()) struct c_scope
*external_scope
;
532 /* A chain of c_scope structures awaiting reuse. */
534 static GTY((deletable
)) struct c_scope
*scope_freelist
;
536 /* A chain of c_binding structures awaiting reuse. */
538 static GTY((deletable
)) struct c_binding
*binding_freelist
;
540 /* Append VAR to LIST in scope SCOPE. */
541 #define SCOPE_LIST_APPEND(scope, list, decl) do { \
542 struct c_scope *s_ = (scope); \
544 if (s_->list##_last) \
545 BLOCK_CHAIN (s_->list##_last) = d_; \
548 s_->list##_last = d_; \
551 /* Concatenate FROM in scope FSCOPE onto TO in scope TSCOPE. */
552 #define SCOPE_LIST_CONCAT(tscope, to, fscope, from) do { \
553 struct c_scope *t_ = (tscope); \
554 struct c_scope *f_ = (fscope); \
556 BLOCK_CHAIN (t_->to##_last) = f_->from; \
559 t_->to##_last = f_->from##_last; \
562 /* A c_inline_static structure stores details of a static identifier
563 referenced in a definition of a function that may be an inline
564 definition if no subsequent declaration of that function uses
565 "extern" or does not use "inline". */
567 struct GTY((chain_next ("%h.next"))) c_inline_static
{
568 /* The location for a diagnostic. */
571 /* The function that may be an inline definition. */
574 /* The object or function referenced. */
577 /* What sort of reference this is. */
578 enum c_inline_static_type type
;
580 /* The next such structure or NULL. */
581 struct c_inline_static
*next
;
584 /* List of static identifiers used or referenced in functions that may
585 be inline definitions. */
586 static GTY(()) struct c_inline_static
*c_inline_statics
;
588 /* True means unconditionally make a BLOCK for the next scope pushed. */
590 static bool keep_next_level_flag
;
592 /* True means the next call to push_scope will be the outermost scope
593 of a function body, so do not push a new scope, merely cease
594 expecting parameter decls. */
596 static bool next_is_function_body
;
598 /* A vector of pointers to c_binding structures. */
600 typedef struct c_binding
*c_binding_ptr
;
602 /* Information that we keep for a struct or union while it is being
605 struct c_struct_parse_info
607 /* If warn_cxx_compat, a list of types defined within this
609 vec
<tree
> struct_types
;
610 /* If warn_cxx_compat, a list of field names which have bindings,
611 and which are defined in this struct, but which are not defined
612 in any enclosing struct. This is used to clear the in_struct
613 field of the c_bindings structure. */
614 vec
<c_binding_ptr
> fields
;
615 /* If warn_cxx_compat, a list of typedef names used when defining
616 fields in this struct. */
617 vec
<tree
> typedefs_seen
;
620 /* Information for the struct or union currently being parsed, or
621 NULL if not parsing a struct or union. */
622 static struct c_struct_parse_info
*struct_parse_info
;
624 /* Forward declarations. */
625 static tree
lookup_name_in_scope (tree
, struct c_scope
*);
626 static tree
c_make_fname_decl (location_t
, tree
, int);
627 static tree
grokdeclarator (const struct c_declarator
*,
628 struct c_declspecs
*,
629 enum decl_context
, bool, tree
*, tree
*, tree
*,
630 bool *, enum deprecated_states
);
631 static tree
grokparms (struct c_arg_info
*, bool);
632 static void layout_array_type (tree
);
633 static void warn_defaults_to (location_t
, int, const char *, ...)
634 ATTRIBUTE_GCC_DIAG(3,4);
636 /* T is a statement. Add it to the statement-tree. This is the
637 C/ObjC version--C++ has a slightly different version of this
643 enum tree_code code
= TREE_CODE (t
);
645 if (CAN_HAVE_LOCATION_P (t
) && code
!= LABEL_EXPR
)
647 if (!EXPR_HAS_LOCATION (t
))
648 SET_EXPR_LOCATION (t
, input_location
);
651 if (code
== LABEL_EXPR
|| code
== CASE_LABEL_EXPR
)
652 STATEMENT_LIST_HAS_LABEL (cur_stmt_list
) = 1;
654 /* Add T to the statement-tree. Non-side-effect statements need to be
655 recorded during statement expressions. */
656 if (!building_stmt_list_p ())
658 append_to_statement_list_force (t
, &cur_stmt_list
);
663 /* Build a pointer type using the default pointer mode. */
666 c_build_pointer_type (tree to_type
)
668 addr_space_t as
= to_type
== error_mark_node
? ADDR_SPACE_GENERIC
669 : TYPE_ADDR_SPACE (to_type
);
670 machine_mode pointer_mode
;
672 if (as
!= ADDR_SPACE_GENERIC
|| c_default_pointer_mode
== VOIDmode
)
673 pointer_mode
= targetm
.addr_space
.pointer_mode (as
);
675 pointer_mode
= c_default_pointer_mode
;
676 return build_pointer_type_for_mode (to_type
, pointer_mode
, false);
680 /* Return true if we will want to say something if a goto statement
684 decl_jump_unsafe (tree decl
)
686 if (error_operand_p (decl
))
689 /* Always warn about crossing variably modified types. */
690 if ((TREE_CODE (decl
) == VAR_DECL
|| TREE_CODE (decl
) == TYPE_DECL
)
691 && variably_modified_type_p (TREE_TYPE (decl
), NULL_TREE
))
694 /* Otherwise, only warn if -Wgoto-misses-init and this is an
695 initialized automatic decl. */
696 if (warn_jump_misses_init
697 && TREE_CODE (decl
) == VAR_DECL
698 && !TREE_STATIC (decl
)
699 && DECL_INITIAL (decl
) != NULL_TREE
)
707 c_print_identifier (FILE *file
, tree node
, int indent
)
709 void (*save
) (enum c_oracle_request
, tree identifier
);
711 /* Temporarily hide any binding oracle. Without this, calls to
712 debug_tree from the debugger will end up calling into the oracle,
713 making for a confusing debug session. As the oracle isn't needed
714 here for normal operation, it's simplest to suppress it. */
715 save
= c_binding_oracle
;
716 c_binding_oracle
= NULL
;
718 print_node (file
, "symbol", I_SYMBOL_DECL (node
), indent
+ 4);
719 print_node (file
, "tag", I_TAG_DECL (node
), indent
+ 4);
720 print_node (file
, "label", I_LABEL_DECL (node
), indent
+ 4);
721 if (C_IS_RESERVED_WORD (node
) && C_RID_CODE (node
) != RID_CXX_COMPAT_WARN
)
723 tree rid
= ridpointers
[C_RID_CODE (node
)];
724 indent_to (file
, indent
+ 4);
725 fprintf (file
, "rid " HOST_PTR_PRINTF
" \"%s\"",
726 (void *) rid
, IDENTIFIER_POINTER (rid
));
729 c_binding_oracle
= save
;
732 /* Establish a binding between NAME, an IDENTIFIER_NODE, and DECL,
733 which may be any of several kinds of DECL or TYPE or error_mark_node,
734 in the scope SCOPE. */
736 bind (tree name
, tree decl
, struct c_scope
*scope
, bool invisible
,
737 bool nested
, location_t locus
)
739 struct c_binding
*b
, **here
;
741 if (binding_freelist
)
743 b
= binding_freelist
;
744 binding_freelist
= b
->prev
;
747 b
= ggc_alloc
<c_binding
> ();
752 b
->depth
= scope
->depth
;
753 b
->invisible
= invisible
;
761 b
->prev
= scope
->bindings
;
764 if (decl_jump_unsafe (decl
))
765 scope
->has_jump_unsafe_decl
= 1;
770 switch (TREE_CODE (decl
))
772 case LABEL_DECL
: here
= &I_LABEL_BINDING (name
); break;
775 case RECORD_TYPE
: here
= &I_TAG_BINDING (name
); break;
781 case ERROR_MARK
: here
= &I_SYMBOL_BINDING (name
); break;
787 /* Locate the appropriate place in the chain of shadowed decls
788 to insert this binding. Normally, scope == current_scope and
789 this does nothing. */
790 while (*here
&& (*here
)->depth
> scope
->depth
)
791 here
= &(*here
)->shadowed
;
797 /* Clear the binding structure B, stick it on the binding_freelist,
798 and return the former value of b->prev. This is used by pop_scope
799 and get_parm_info to iterate destructively over all the bindings
800 from a given scope. */
801 static struct c_binding
*
802 free_binding_and_advance (struct c_binding
*b
)
804 struct c_binding
*prev
= b
->prev
;
806 memset (b
, 0, sizeof (struct c_binding
));
807 b
->prev
= binding_freelist
;
808 binding_freelist
= b
;
813 /* Bind a label. Like bind, but skip fields which aren't used for
814 labels, and add the LABEL_VARS value. */
816 bind_label (tree name
, tree label
, struct c_scope
*scope
,
817 struct c_label_vars
*label_vars
)
821 bind (name
, label
, scope
, /*invisible=*/false, /*nested=*/false,
824 scope
->has_label_bindings
= true;
827 gcc_assert (b
->decl
== label
);
828 label_vars
->shadowed
= b
->u
.label
;
829 b
->u
.label
= label_vars
;
832 /* Hook called at end of compilation to assume 1 elt
833 for a file-scope tentative array defn that wasn't complete before. */
836 c_finish_incomplete_decl (tree decl
)
838 if (TREE_CODE (decl
) == VAR_DECL
)
840 tree type
= TREE_TYPE (decl
);
841 if (type
!= error_mark_node
842 && TREE_CODE (type
) == ARRAY_TYPE
843 && !DECL_EXTERNAL (decl
)
844 && TYPE_DOMAIN (type
) == 0)
846 warning_at (DECL_SOURCE_LOCATION (decl
),
847 0, "array %q+D assumed to have one element", decl
);
849 complete_array_type (&TREE_TYPE (decl
), NULL_TREE
, true);
851 relayout_decl (decl
);
856 /* Record that inline function FUNC contains a reference (location
857 LOC) to static DECL (file-scope or function-local according to
861 record_inline_static (location_t loc
, tree func
, tree decl
,
862 enum c_inline_static_type type
)
864 c_inline_static
*csi
= ggc_alloc
<c_inline_static
> ();
866 csi
->function
= func
;
867 csi
->static_decl
= decl
;
869 csi
->next
= c_inline_statics
;
870 c_inline_statics
= csi
;
873 /* Check for references to static declarations in inline functions at
874 the end of the translation unit and diagnose them if the functions
875 are still inline definitions. */
878 check_inline_statics (void)
880 struct c_inline_static
*csi
;
881 for (csi
= c_inline_statics
; csi
; csi
= csi
->next
)
883 if (DECL_EXTERNAL (csi
->function
))
887 pedwarn (csi
->location
, 0,
888 "%qD is static but used in inline function %qD "
889 "which is not static", csi
->static_decl
, csi
->function
);
892 pedwarn (csi
->location
, 0,
893 "%q+D is static but declared in inline function %qD "
894 "which is not static", csi
->static_decl
, csi
->function
);
900 c_inline_statics
= NULL
;
903 /* Fill in a c_spot_bindings structure. If DEFINING is true, set it
904 for the current state, otherwise set it to uninitialized. */
907 set_spot_bindings (struct c_spot_bindings
*p
, bool defining
)
911 p
->scope
= current_scope
;
912 p
->bindings_in_scope
= current_scope
->bindings
;
917 p
->bindings_in_scope
= NULL
;
920 p
->left_stmt_expr
= false;
923 /* Update spot bindings P as we pop out of SCOPE. Return true if we
924 should push decls for a label. */
927 update_spot_bindings (struct c_scope
*scope
, struct c_spot_bindings
*p
)
929 if (p
->scope
!= scope
)
931 /* This label or goto is defined in some other scope, or it is a
932 label which is not yet defined. There is nothing to
937 /* Adjust the spot bindings to refer to the bindings already defined
938 in the enclosing scope. */
939 p
->scope
= scope
->outer
;
940 p
->bindings_in_scope
= p
->scope
->bindings
;
945 /* The Objective-C front-end often needs to determine the current scope. */
948 objc_get_current_scope (void)
950 return current_scope
;
953 /* The following function is used only by Objective-C. It needs to live here
954 because it accesses the innards of c_scope. */
957 objc_mark_locals_volatile (void *enclosing_blk
)
959 struct c_scope
*scope
;
962 for (scope
= current_scope
;
963 scope
&& scope
!= enclosing_blk
;
964 scope
= scope
->outer
)
966 for (b
= scope
->bindings
; b
; b
= b
->prev
)
967 objc_volatilize_decl (b
->decl
);
969 /* Do not climb up past the current function. */
970 if (scope
->function_body
)
975 /* Return true if we are in the global binding level. */
978 global_bindings_p (void)
980 return current_scope
== file_scope
;
984 keep_next_level (void)
986 keep_next_level_flag
= true;
989 /* Set the flag for the FLOAT_CONST_DECIMAL64 pragma being ON. */
992 set_float_const_decimal64 (void)
994 current_scope
->float_const_decimal64
= true;
997 /* Clear the flag for the FLOAT_CONST_DECIMAL64 pragma. */
1000 clear_float_const_decimal64 (void)
1002 current_scope
->float_const_decimal64
= false;
1005 /* Return nonzero if an unsuffixed float constant is _Decimal64. */
1008 float_const_decimal64_p (void)
1010 return current_scope
->float_const_decimal64
;
1013 /* Identify this scope as currently being filled with parameters. */
1016 declare_parm_level (void)
1018 current_scope
->parm_flag
= true;
1024 if (next_is_function_body
)
1026 /* This is the transition from the parameters to the top level
1027 of the function body. These are the same scope
1028 (C99 6.2.1p4,6) so we do not push another scope structure.
1029 next_is_function_body is set only by store_parm_decls, which
1030 in turn is called when and only when we are about to
1031 encounter the opening curly brace for the function body.
1033 The outermost block of a function always gets a BLOCK node,
1034 because the debugging output routines expect that each
1035 function has at least one BLOCK. */
1036 current_scope
->parm_flag
= false;
1037 current_scope
->function_body
= true;
1038 current_scope
->keep
= true;
1039 current_scope
->outer_function
= current_function_scope
;
1040 current_function_scope
= current_scope
;
1042 keep_next_level_flag
= false;
1043 next_is_function_body
= false;
1045 /* The FLOAT_CONST_DECIMAL64 pragma applies to nested scopes. */
1046 if (current_scope
->outer
)
1047 current_scope
->float_const_decimal64
1048 = current_scope
->outer
->float_const_decimal64
;
1050 current_scope
->float_const_decimal64
= false;
1054 struct c_scope
*scope
;
1057 scope
= scope_freelist
;
1058 scope_freelist
= scope
->outer
;
1061 scope
= ggc_cleared_alloc
<c_scope
> ();
1063 /* The FLOAT_CONST_DECIMAL64 pragma applies to nested scopes. */
1065 scope
->float_const_decimal64
= current_scope
->float_const_decimal64
;
1067 scope
->float_const_decimal64
= false;
1069 scope
->keep
= keep_next_level_flag
;
1070 scope
->outer
= current_scope
;
1071 scope
->depth
= current_scope
? (current_scope
->depth
+ 1) : 0;
1073 /* Check for scope depth overflow. Unlikely (2^28 == 268,435,456) but
1075 if (current_scope
&& scope
->depth
== 0)
1078 sorry ("GCC supports only %u nested scopes", scope
->depth
);
1081 current_scope
= scope
;
1082 keep_next_level_flag
= false;
1086 /* This is called when we are leaving SCOPE. For each label defined
1087 in SCOPE, add any appropriate decls to its decls_in_scope fields.
1088 These are the decls whose initialization will be skipped by a goto
1089 later in the function. */
1092 update_label_decls (struct c_scope
*scope
)
1099 if (s
->has_label_bindings
)
1101 struct c_binding
*b
;
1103 for (b
= s
->bindings
; b
!= NULL
; b
= b
->prev
)
1105 struct c_label_vars
*label_vars
;
1106 struct c_binding
*b1
;
1109 struct c_goto_bindings
*g
;
1111 if (TREE_CODE (b
->decl
) != LABEL_DECL
)
1113 label_vars
= b
->u
.label
;
1115 b1
= label_vars
->label_bindings
.bindings_in_scope
;
1116 if (label_vars
->label_bindings
.scope
== NULL
)
1119 hjud
= label_vars
->label_bindings
.scope
->has_jump_unsafe_decl
;
1120 if (update_spot_bindings (scope
, &label_vars
->label_bindings
))
1122 /* This label is defined in this scope. */
1125 for (; b1
!= NULL
; b1
= b1
->prev
)
1127 /* A goto from later in the function to this
1128 label will never see the initialization
1129 of B1, if any. Save it to issue a
1130 warning if needed. */
1131 if (decl_jump_unsafe (b1
->decl
))
1132 vec_safe_push(label_vars
->decls_in_scope
, b1
->decl
);
1137 /* Update the bindings of any goto statements associated
1139 FOR_EACH_VEC_SAFE_ELT (label_vars
->gotos
, ix
, g
)
1140 update_spot_bindings (scope
, &g
->goto_bindings
);
1144 /* Don't search beyond the current function. */
1145 if (s
== current_function_scope
)
1152 /* Set the TYPE_CONTEXT of all of TYPE's variants to CONTEXT. */
1155 set_type_context (tree type
, tree context
)
1157 for (type
= TYPE_MAIN_VARIANT (type
); type
;
1158 type
= TYPE_NEXT_VARIANT (type
))
1159 TYPE_CONTEXT (type
) = context
;
1162 /* Exit a scope. Restore the state of the identifier-decl mappings
1163 that were in effect when this scope was entered. Return a BLOCK
1164 node containing all the DECLs in this scope that are of interest
1165 to debug info generation. */
1170 struct c_scope
*scope
= current_scope
;
1171 tree block
, context
, p
;
1172 struct c_binding
*b
;
1174 bool functionbody
= scope
->function_body
;
1175 bool keep
= functionbody
|| scope
->keep
|| scope
->bindings
;
1177 update_label_decls (scope
);
1179 /* If appropriate, create a BLOCK to record the decls for the life
1180 of this function. */
1184 block
= make_node (BLOCK
);
1185 BLOCK_SUBBLOCKS (block
) = scope
->blocks
;
1186 TREE_USED (block
) = 1;
1188 /* In each subblock, record that this is its superior. */
1189 for (p
= scope
->blocks
; p
; p
= BLOCK_CHAIN (p
))
1190 BLOCK_SUPERCONTEXT (p
) = block
;
1192 BLOCK_VARS (block
) = 0;
1195 /* The TYPE_CONTEXTs for all of the tagged types belonging to this
1196 scope must be set so that they point to the appropriate
1197 construct, i.e. either to the current FUNCTION_DECL node, or
1198 else to the BLOCK node we just constructed.
1200 Note that for tagged types whose scope is just the formal
1201 parameter list for some function type specification, we can't
1202 properly set their TYPE_CONTEXTs here, because we don't have a
1203 pointer to the appropriate FUNCTION_TYPE node readily available
1204 to us. For those cases, the TYPE_CONTEXTs of the relevant tagged
1205 type nodes get set in `grokdeclarator' as soon as we have created
1206 the FUNCTION_TYPE node which will represent the "scope" for these
1207 "parameter list local" tagged types. */
1208 if (scope
->function_body
)
1209 context
= current_function_decl
;
1210 else if (scope
== file_scope
)
1212 tree file_decl
= build_translation_unit_decl (NULL_TREE
);
1213 context
= file_decl
;
1218 /* Clear all bindings in this scope. */
1219 for (b
= scope
->bindings
; b
; b
= free_binding_and_advance (b
))
1222 switch (TREE_CODE (p
))
1225 /* Warnings for unused labels, errors for undefined labels. */
1226 if (TREE_USED (p
) && !DECL_INITIAL (p
))
1228 error ("label %q+D used but not defined", p
);
1229 DECL_INITIAL (p
) = error_mark_node
;
1232 warn_for_unused_label (p
);
1234 /* Labels go in BLOCK_VARS. */
1235 DECL_CHAIN (p
) = BLOCK_VARS (block
);
1236 BLOCK_VARS (block
) = p
;
1237 gcc_assert (I_LABEL_BINDING (b
->id
) == b
);
1238 I_LABEL_BINDING (b
->id
) = b
->shadowed
;
1240 /* Also pop back to the shadowed label_vars. */
1241 release_tree_vector (b
->u
.label
->decls_in_scope
);
1242 b
->u
.label
= b
->u
.label
->shadowed
;
1248 set_type_context (p
, context
);
1250 /* Types may not have tag-names, in which case the type
1251 appears in the bindings list with b->id NULL. */
1254 gcc_assert (I_TAG_BINDING (b
->id
) == b
);
1255 I_TAG_BINDING (b
->id
) = b
->shadowed
;
1260 /* Propagate TREE_ADDRESSABLE from nested functions to their
1261 containing functions. */
1262 if (!TREE_ASM_WRITTEN (p
)
1263 && DECL_INITIAL (p
) != 0
1264 && TREE_ADDRESSABLE (p
)
1265 && DECL_ABSTRACT_ORIGIN (p
) != 0
1266 && DECL_ABSTRACT_ORIGIN (p
) != p
)
1267 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (p
)) = 1;
1268 if (!DECL_EXTERNAL (p
)
1269 && !DECL_INITIAL (p
)
1270 && scope
!= file_scope
1271 && scope
!= external_scope
)
1273 error ("nested function %q+D declared but never defined", p
);
1274 undef_nested_function
= true;
1276 else if (DECL_DECLARED_INLINE_P (p
)
1278 && !DECL_INITIAL (p
))
1280 /* C99 6.7.4p6: "a function with external linkage... declared
1281 with an inline function specifier ... shall also be defined
1282 in the same translation unit." */
1283 if (!flag_gnu89_inline
1284 && !lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (p
))
1285 && scope
!= external_scope
)
1286 pedwarn (input_location
, 0,
1287 "inline function %q+D declared but never defined", p
);
1288 DECL_EXTERNAL (p
) = 1;
1294 /* Warnings for unused variables. */
1295 if ((!TREE_USED (p
) || !DECL_READ_P (p
))
1296 && !TREE_NO_WARNING (p
)
1297 && !DECL_IN_SYSTEM_HEADER (p
)
1299 && !DECL_ARTIFICIAL (p
)
1300 && scope
!= file_scope
1301 && scope
!= external_scope
)
1304 warning (OPT_Wunused_variable
, "unused variable %q+D", p
);
1305 else if (DECL_CONTEXT (p
) == current_function_decl
)
1306 warning_at (DECL_SOURCE_LOCATION (p
),
1307 OPT_Wunused_but_set_variable
,
1308 "variable %qD set but not used", p
);
1313 error ("type of array %q+D completed incompatibly with"
1314 " implicit initialization", p
);
1321 /* All of these go in BLOCK_VARS, but only if this is the
1322 binding in the home scope. */
1325 DECL_CHAIN (p
) = BLOCK_VARS (block
);
1326 BLOCK_VARS (block
) = p
;
1328 else if (VAR_OR_FUNCTION_DECL_P (p
) && scope
!= file_scope
)
1330 /* For block local externs add a special
1331 DECL_EXTERNAL decl for debug info generation. */
1332 tree extp
= copy_node (p
);
1334 DECL_EXTERNAL (extp
) = 1;
1335 TREE_STATIC (extp
) = 0;
1336 TREE_PUBLIC (extp
) = 1;
1337 DECL_INITIAL (extp
) = NULL_TREE
;
1338 DECL_LANG_SPECIFIC (extp
) = NULL
;
1339 DECL_CONTEXT (extp
) = current_function_decl
;
1340 if (TREE_CODE (p
) == FUNCTION_DECL
)
1342 DECL_RESULT (extp
) = NULL_TREE
;
1343 DECL_SAVED_TREE (extp
) = NULL_TREE
;
1344 DECL_STRUCT_FUNCTION (extp
) = NULL
;
1346 if (b
->locus
!= UNKNOWN_LOCATION
)
1347 DECL_SOURCE_LOCATION (extp
) = b
->locus
;
1348 DECL_CHAIN (extp
) = BLOCK_VARS (block
);
1349 BLOCK_VARS (block
) = extp
;
1351 /* If this is the file scope set DECL_CONTEXT of each decl to
1352 the TRANSLATION_UNIT_DECL. This makes same_translation_unit_p
1354 if (scope
== file_scope
)
1356 DECL_CONTEXT (p
) = context
;
1357 if (TREE_CODE (p
) == TYPE_DECL
1358 && TREE_TYPE (p
) != error_mark_node
)
1359 set_type_context (TREE_TYPE (p
), context
);
1363 /* Parameters go in DECL_ARGUMENTS, not BLOCK_VARS, and have
1364 already been put there by store_parm_decls. Unused-
1365 parameter warnings are handled by function.c.
1366 error_mark_node obviously does not go in BLOCK_VARS and
1367 does not get unused-variable warnings. */
1370 /* It is possible for a decl not to have a name. We get
1371 here with b->id NULL in this case. */
1374 gcc_assert (I_SYMBOL_BINDING (b
->id
) == b
);
1375 I_SYMBOL_BINDING (b
->id
) = b
->shadowed
;
1376 if (b
->shadowed
&& b
->shadowed
->u
.type
)
1377 TREE_TYPE (b
->shadowed
->decl
) = b
->shadowed
->u
.type
;
1387 /* Dispose of the block that we just made inside some higher level. */
1388 if ((scope
->function_body
|| scope
== file_scope
) && context
)
1390 DECL_INITIAL (context
) = block
;
1391 BLOCK_SUPERCONTEXT (block
) = context
;
1393 else if (scope
->outer
)
1396 SCOPE_LIST_APPEND (scope
->outer
, blocks
, block
);
1397 /* If we did not make a block for the scope just exited, any
1398 blocks made for inner scopes must be carried forward so they
1399 will later become subblocks of something else. */
1400 else if (scope
->blocks
)
1401 SCOPE_LIST_CONCAT (scope
->outer
, blocks
, scope
, blocks
);
1404 /* Pop the current scope, and free the structure for reuse. */
1405 current_scope
= scope
->outer
;
1406 if (scope
->function_body
)
1407 current_function_scope
= scope
->outer_function
;
1409 memset (scope
, 0, sizeof (struct c_scope
));
1410 scope
->outer
= scope_freelist
;
1411 scope_freelist
= scope
;
1417 push_file_scope (void)
1425 file_scope
= current_scope
;
1427 start_fname_decls ();
1429 for (decl
= visible_builtins
; decl
; decl
= DECL_CHAIN (decl
))
1430 bind (DECL_NAME (decl
), decl
, file_scope
,
1431 /*invisible=*/false, /*nested=*/true, DECL_SOURCE_LOCATION (decl
));
1435 pop_file_scope (void)
1437 /* In case there were missing closebraces, get us back to the global
1439 while (current_scope
!= file_scope
)
1442 /* __FUNCTION__ is defined at file scope (""). This
1443 call may not be necessary as my tests indicate it
1444 still works without it. */
1445 finish_fname_decls ();
1447 check_inline_statics ();
1449 /* This is the point to write out a PCH if we're doing that.
1450 In that case we do not want to do anything else. */
1453 c_common_write_pch ();
1457 /* Pop off the file scope and close this translation unit. */
1461 maybe_apply_pending_pragma_weaks ();
1464 /* Adjust the bindings for the start of a statement expression. */
1467 c_bindings_start_stmt_expr (struct c_spot_bindings
* switch_bindings
)
1469 struct c_scope
*scope
;
1471 for (scope
= current_scope
; scope
!= NULL
; scope
= scope
->outer
)
1473 struct c_binding
*b
;
1475 if (!scope
->has_label_bindings
)
1478 for (b
= scope
->bindings
; b
!= NULL
; b
= b
->prev
)
1480 struct c_label_vars
*label_vars
;
1482 struct c_goto_bindings
*g
;
1484 if (TREE_CODE (b
->decl
) != LABEL_DECL
)
1486 label_vars
= b
->u
.label
;
1487 ++label_vars
->label_bindings
.stmt_exprs
;
1488 FOR_EACH_VEC_SAFE_ELT (label_vars
->gotos
, ix
, g
)
1489 ++g
->goto_bindings
.stmt_exprs
;
1493 if (switch_bindings
!= NULL
)
1494 ++switch_bindings
->stmt_exprs
;
1497 /* Adjust the bindings for the end of a statement expression. */
1500 c_bindings_end_stmt_expr (struct c_spot_bindings
*switch_bindings
)
1502 struct c_scope
*scope
;
1504 for (scope
= current_scope
; scope
!= NULL
; scope
= scope
->outer
)
1506 struct c_binding
*b
;
1508 if (!scope
->has_label_bindings
)
1511 for (b
= scope
->bindings
; b
!= NULL
; b
= b
->prev
)
1513 struct c_label_vars
*label_vars
;
1515 struct c_goto_bindings
*g
;
1517 if (TREE_CODE (b
->decl
) != LABEL_DECL
)
1519 label_vars
= b
->u
.label
;
1520 --label_vars
->label_bindings
.stmt_exprs
;
1521 if (label_vars
->label_bindings
.stmt_exprs
< 0)
1523 label_vars
->label_bindings
.left_stmt_expr
= true;
1524 label_vars
->label_bindings
.stmt_exprs
= 0;
1526 FOR_EACH_VEC_SAFE_ELT (label_vars
->gotos
, ix
, g
)
1528 --g
->goto_bindings
.stmt_exprs
;
1529 if (g
->goto_bindings
.stmt_exprs
< 0)
1531 g
->goto_bindings
.left_stmt_expr
= true;
1532 g
->goto_bindings
.stmt_exprs
= 0;
1538 if (switch_bindings
!= NULL
)
1540 --switch_bindings
->stmt_exprs
;
1541 gcc_assert (switch_bindings
->stmt_exprs
>= 0);
1545 /* Push a definition or a declaration of struct, union or enum tag "name".
1546 "type" should be the type node.
1547 We assume that the tag "name" is not already defined, and has a location
1550 Note that the definition may really be just a forward reference.
1551 In that case, the TYPE_SIZE will be zero. */
1554 pushtag (location_t loc
, tree name
, tree type
)
1556 /* Record the identifier as the type's name if it has none. */
1557 if (name
&& !TYPE_NAME (type
))
1558 TYPE_NAME (type
) = name
;
1559 bind (name
, type
, current_scope
, /*invisible=*/false, /*nested=*/false, loc
);
1561 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1562 tagged type we just added to the current scope. This fake
1563 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1564 to output a representation of a tagged type, and it also gives
1565 us a convenient place to record the "scope start" address for the
1568 TYPE_STUB_DECL (type
) = pushdecl (build_decl (loc
,
1569 TYPE_DECL
, NULL_TREE
, type
));
1571 /* An approximation for now, so we can tell this is a function-scope tag.
1572 This will be updated in pop_scope. */
1573 TYPE_CONTEXT (type
) = DECL_CONTEXT (TYPE_STUB_DECL (type
));
1575 if (warn_cxx_compat
&& name
!= NULL_TREE
)
1577 struct c_binding
*b
= I_SYMBOL_BINDING (name
);
1580 && b
->decl
!= NULL_TREE
1581 && TREE_CODE (b
->decl
) == TYPE_DECL
1582 && (B_IN_CURRENT_SCOPE (b
)
1583 || (current_scope
== file_scope
&& B_IN_EXTERNAL_SCOPE (b
)))
1584 && (TYPE_MAIN_VARIANT (TREE_TYPE (b
->decl
))
1585 != TYPE_MAIN_VARIANT (type
)))
1587 warning_at (loc
, OPT_Wc___compat
,
1588 ("using %qD as both a typedef and a tag is "
1591 if (b
->locus
!= UNKNOWN_LOCATION
)
1592 inform (b
->locus
, "originally defined here");
1597 /* An exported interface to pushtag. This is used by the gdb plugin's
1598 binding oracle to introduce a new tag binding. */
1601 c_pushtag (location_t loc
, tree name
, tree type
)
1603 pushtag (loc
, name
, type
);
1606 /* An exported interface to bind a declaration. LOC is the location
1607 to use. DECL is the declaration to bind. The decl's name is used
1608 to determine how it is bound. If DECL is a VAR_DECL, then
1609 IS_GLOBAL determines whether the decl is put into the global (file
1610 and external) scope or the current function's scope; if DECL is not
1611 a VAR_DECL then it is always put into the file scope. */
1614 c_bind (location_t loc
, tree decl
, bool is_global
)
1616 struct c_scope
*scope
;
1617 bool nested
= false;
1619 if (TREE_CODE (decl
) != VAR_DECL
|| current_function_scope
== NULL
)
1621 /* Types and functions are always considered to be global. */
1623 DECL_EXTERNAL (decl
) = 1;
1624 TREE_PUBLIC (decl
) = 1;
1628 /* Also bind it into the external scope. */
1629 bind (DECL_NAME (decl
), decl
, external_scope
, true, false, loc
);
1632 DECL_EXTERNAL (decl
) = 1;
1633 TREE_PUBLIC (decl
) = 1;
1637 DECL_CONTEXT (decl
) = current_function_decl
;
1638 TREE_PUBLIC (decl
) = 0;
1639 scope
= current_function_scope
;
1642 bind (DECL_NAME (decl
), decl
, scope
, false, nested
, loc
);
1645 /* Subroutine of compare_decls. Allow harmless mismatches in return
1646 and argument types provided that the type modes match. This function
1647 return a unified type given a suitable match, and 0 otherwise. */
1650 match_builtin_function_types (tree newtype
, tree oldtype
)
1652 tree newrettype
, oldrettype
;
1653 tree newargs
, oldargs
;
1654 tree trytype
, tryargs
;
1656 /* Accept the return type of the new declaration if same modes. */
1657 oldrettype
= TREE_TYPE (oldtype
);
1658 newrettype
= TREE_TYPE (newtype
);
1660 if (TYPE_MODE (oldrettype
) != TYPE_MODE (newrettype
))
1663 oldargs
= TYPE_ARG_TYPES (oldtype
);
1664 newargs
= TYPE_ARG_TYPES (newtype
);
1667 while (oldargs
|| newargs
)
1671 || !TREE_VALUE (oldargs
)
1672 || !TREE_VALUE (newargs
)
1673 || TYPE_MODE (TREE_VALUE (oldargs
))
1674 != TYPE_MODE (TREE_VALUE (newargs
)))
1677 oldargs
= TREE_CHAIN (oldargs
);
1678 newargs
= TREE_CHAIN (newargs
);
1681 trytype
= build_function_type (newrettype
, tryargs
);
1682 return build_type_attribute_variant (trytype
, TYPE_ATTRIBUTES (oldtype
));
1685 /* Subroutine of diagnose_mismatched_decls. Check for function type
1686 mismatch involving an empty arglist vs a nonempty one and give clearer
1689 diagnose_arglist_conflict (tree newdecl
, tree olddecl
,
1690 tree newtype
, tree oldtype
)
1694 if (TREE_CODE (olddecl
) != FUNCTION_DECL
1695 || !comptypes (TREE_TYPE (oldtype
), TREE_TYPE (newtype
))
1696 || !((!prototype_p (oldtype
) && DECL_INITIAL (olddecl
) == 0)
1697 || (!prototype_p (newtype
) && DECL_INITIAL (newdecl
) == 0)))
1700 t
= TYPE_ARG_TYPES (oldtype
);
1702 t
= TYPE_ARG_TYPES (newtype
);
1703 for (; t
; t
= TREE_CHAIN (t
))
1705 tree type
= TREE_VALUE (t
);
1707 if (TREE_CHAIN (t
) == 0
1708 && TYPE_MAIN_VARIANT (type
) != void_type_node
)
1710 inform (input_location
, "a parameter list with an ellipsis can%'t match "
1711 "an empty parameter name list declaration");
1715 if (c_type_promotes_to (type
) != type
)
1717 inform (input_location
, "an argument type that has a default promotion can%'t match "
1718 "an empty parameter name list declaration");
1724 /* Another subroutine of diagnose_mismatched_decls. OLDDECL is an
1725 old-style function definition, NEWDECL is a prototype declaration.
1726 Diagnose inconsistencies in the argument list. Returns TRUE if
1727 the prototype is compatible, FALSE if not. */
1729 validate_proto_after_old_defn (tree newdecl
, tree newtype
, tree oldtype
)
1731 tree newargs
, oldargs
;
1734 #define END_OF_ARGLIST(t) ((t) == void_type_node)
1736 oldargs
= TYPE_ACTUAL_ARG_TYPES (oldtype
);
1737 newargs
= TYPE_ARG_TYPES (newtype
);
1742 tree oldargtype
= TREE_VALUE (oldargs
);
1743 tree newargtype
= TREE_VALUE (newargs
);
1745 if (oldargtype
== error_mark_node
|| newargtype
== error_mark_node
)
1748 oldargtype
= (TYPE_ATOMIC (oldargtype
)
1749 ? c_build_qualified_type (TYPE_MAIN_VARIANT (oldargtype
),
1751 : TYPE_MAIN_VARIANT (oldargtype
));
1752 newargtype
= (TYPE_ATOMIC (newargtype
)
1753 ? c_build_qualified_type (TYPE_MAIN_VARIANT (newargtype
),
1755 : TYPE_MAIN_VARIANT (newargtype
));
1757 if (END_OF_ARGLIST (oldargtype
) && END_OF_ARGLIST (newargtype
))
1760 /* Reaching the end of just one list means the two decls don't
1761 agree on the number of arguments. */
1762 if (END_OF_ARGLIST (oldargtype
))
1764 error ("prototype for %q+D declares more arguments "
1765 "than previous old-style definition", newdecl
);
1768 else if (END_OF_ARGLIST (newargtype
))
1770 error ("prototype for %q+D declares fewer arguments "
1771 "than previous old-style definition", newdecl
);
1775 /* Type for passing arg must be consistent with that declared
1777 else if (!comptypes (oldargtype
, newargtype
))
1779 error ("prototype for %q+D declares argument %d"
1780 " with incompatible type",
1785 oldargs
= TREE_CHAIN (oldargs
);
1786 newargs
= TREE_CHAIN (newargs
);
1790 /* If we get here, no errors were found, but do issue a warning
1791 for this poor-style construct. */
1792 warning (0, "prototype for %q+D follows non-prototype definition",
1795 #undef END_OF_ARGLIST
1798 /* Subroutine of diagnose_mismatched_decls. Report the location of DECL,
1799 first in a pair of mismatched declarations, using the diagnostic
1802 locate_old_decl (tree decl
)
1804 if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_BUILT_IN (decl
)
1805 && !C_DECL_DECLARED_BUILTIN (decl
))
1807 else if (DECL_INITIAL (decl
))
1808 inform (input_location
, "previous definition of %q+D was here", decl
);
1809 else if (C_DECL_IMPLICIT (decl
))
1810 inform (input_location
, "previous implicit declaration of %q+D was here", decl
);
1812 inform (input_location
, "previous declaration of %q+D was here", decl
);
1815 /* Subroutine of duplicate_decls. Compare NEWDECL to OLDDECL.
1816 Returns true if the caller should proceed to merge the two, false
1817 if OLDDECL should simply be discarded. As a side effect, issues
1818 all necessary diagnostics for invalid or poor-style combinations.
1819 If it returns true, writes the types of NEWDECL and OLDDECL to
1820 *NEWTYPEP and *OLDTYPEP - these may have been adjusted from
1821 TREE_TYPE (NEWDECL, OLDDECL) respectively. */
1824 diagnose_mismatched_decls (tree newdecl
, tree olddecl
,
1825 tree
*newtypep
, tree
*oldtypep
)
1827 tree newtype
, oldtype
;
1828 bool pedwarned
= false;
1829 bool warned
= false;
1832 #define DECL_EXTERN_INLINE(DECL) (DECL_DECLARED_INLINE_P (DECL) \
1833 && DECL_EXTERNAL (DECL))
1835 /* If we have error_mark_node for either decl or type, just discard
1836 the previous decl - we're in an error cascade already. */
1837 if (olddecl
== error_mark_node
|| newdecl
== error_mark_node
)
1839 *oldtypep
= oldtype
= TREE_TYPE (olddecl
);
1840 *newtypep
= newtype
= TREE_TYPE (newdecl
);
1841 if (oldtype
== error_mark_node
|| newtype
== error_mark_node
)
1844 /* Two different categories of symbol altogether. This is an error
1845 unless OLDDECL is a builtin. OLDDECL will be discarded in any case. */
1846 if (TREE_CODE (olddecl
) != TREE_CODE (newdecl
))
1848 if (!(TREE_CODE (olddecl
) == FUNCTION_DECL
1849 && DECL_BUILT_IN (olddecl
)
1850 && !C_DECL_DECLARED_BUILTIN (olddecl
)))
1852 error ("%q+D redeclared as different kind of symbol", newdecl
);
1853 locate_old_decl (olddecl
);
1855 else if (TREE_PUBLIC (newdecl
))
1856 warning (0, "built-in function %q+D declared as non-function",
1859 warning (OPT_Wshadow
, "declaration of %q+D shadows "
1860 "a built-in function", newdecl
);
1864 /* Enumerators have no linkage, so may only be declared once in a
1866 if (TREE_CODE (olddecl
) == CONST_DECL
)
1868 error ("redeclaration of enumerator %q+D", newdecl
);
1869 locate_old_decl (olddecl
);
1873 if (!comptypes (oldtype
, newtype
))
1875 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1876 && DECL_BUILT_IN (olddecl
) && !C_DECL_DECLARED_BUILTIN (olddecl
))
1878 /* Accept harmless mismatch in function types.
1879 This is for the ffs and fprintf builtins. */
1880 tree trytype
= match_builtin_function_types (newtype
, oldtype
);
1882 if (trytype
&& comptypes (newtype
, trytype
))
1883 *oldtypep
= oldtype
= trytype
;
1886 /* If types don't match for a built-in, throw away the
1887 built-in. No point in calling locate_old_decl here, it
1888 won't print anything. */
1889 warning (0, "conflicting types for built-in function %q+D",
1894 else if (TREE_CODE (olddecl
) == FUNCTION_DECL
1895 && DECL_IS_BUILTIN (olddecl
))
1897 /* A conflicting function declaration for a predeclared
1898 function that isn't actually built in. Objective C uses
1899 these. The new declaration silently overrides everything
1900 but the volatility (i.e. noreturn) indication. See also
1901 below. FIXME: Make Objective C use normal builtins. */
1902 TREE_THIS_VOLATILE (newdecl
) |= TREE_THIS_VOLATILE (olddecl
);
1905 /* Permit void foo (...) to match int foo (...) if the latter is
1906 the definition and implicit int was used. See
1907 c-torture/compile/920625-2.c. */
1908 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
&& DECL_INITIAL (newdecl
)
1909 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype
)) == void_type_node
1910 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype
)) == integer_type_node
1911 && C_FUNCTION_IMPLICIT_INT (newdecl
) && !DECL_INITIAL (olddecl
))
1913 pedwarned
= pedwarn (input_location
, 0,
1914 "conflicting types for %q+D", newdecl
);
1915 /* Make sure we keep void as the return type. */
1916 TREE_TYPE (newdecl
) = *newtypep
= newtype
= oldtype
;
1917 C_FUNCTION_IMPLICIT_INT (newdecl
) = 0;
1919 /* Permit void foo (...) to match an earlier call to foo (...) with
1920 no declared type (thus, implicitly int). */
1921 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
1922 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype
)) == void_type_node
1923 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype
)) == integer_type_node
1924 && C_DECL_IMPLICIT (olddecl
) && !DECL_INITIAL (olddecl
))
1926 pedwarned
= pedwarn (input_location
, 0,
1927 "conflicting types for %q+D", newdecl
);
1928 /* Make sure we keep void as the return type. */
1929 TREE_TYPE (olddecl
) = *oldtypep
= oldtype
= newtype
;
1933 int new_quals
= TYPE_QUALS (newtype
);
1934 int old_quals
= TYPE_QUALS (oldtype
);
1936 if (new_quals
!= old_quals
)
1938 addr_space_t new_addr
= DECODE_QUAL_ADDR_SPACE (new_quals
);
1939 addr_space_t old_addr
= DECODE_QUAL_ADDR_SPACE (old_quals
);
1940 if (new_addr
!= old_addr
)
1942 if (ADDR_SPACE_GENERIC_P (new_addr
))
1943 error ("conflicting named address spaces (generic vs %s) "
1945 c_addr_space_name (old_addr
), newdecl
);
1946 else if (ADDR_SPACE_GENERIC_P (old_addr
))
1947 error ("conflicting named address spaces (%s vs generic) "
1949 c_addr_space_name (new_addr
), newdecl
);
1951 error ("conflicting named address spaces (%s vs %s) "
1953 c_addr_space_name (new_addr
),
1954 c_addr_space_name (old_addr
),
1958 if (CLEAR_QUAL_ADDR_SPACE (new_quals
)
1959 != CLEAR_QUAL_ADDR_SPACE (old_quals
))
1960 error ("conflicting type qualifiers for %q+D", newdecl
);
1963 error ("conflicting types for %q+D", newdecl
);
1964 diagnose_arglist_conflict (newdecl
, olddecl
, newtype
, oldtype
);
1965 locate_old_decl (olddecl
);
1970 /* Redeclaration of a type is a constraint violation (6.7.2.3p1),
1971 but silently ignore the redeclaration if either is in a system
1972 header. (Conflicting redeclarations were handled above.) This
1973 is allowed for C11 if the types are the same, not just
1975 if (TREE_CODE (newdecl
) == TYPE_DECL
)
1977 bool types_different
= false;
1978 int comptypes_result
;
1981 = comptypes_check_different_types (oldtype
, newtype
, &types_different
);
1983 if (comptypes_result
!= 1 || types_different
)
1985 error ("redefinition of typedef %q+D with different type", newdecl
);
1986 locate_old_decl (olddecl
);
1990 if (DECL_IN_SYSTEM_HEADER (newdecl
)
1991 || DECL_IN_SYSTEM_HEADER (olddecl
)
1992 || TREE_NO_WARNING (newdecl
)
1993 || TREE_NO_WARNING (olddecl
))
1994 return true; /* Allow OLDDECL to continue in use. */
1996 if (variably_modified_type_p (newtype
, NULL
))
1998 error ("redefinition of typedef %q+D with variably modified type",
2000 locate_old_decl (olddecl
);
2002 else if (pedwarn_c99 (input_location
, OPT_Wpedantic
,
2003 "redefinition of typedef %q+D", newdecl
))
2004 locate_old_decl (olddecl
);
2009 /* Function declarations can either be 'static' or 'extern' (no
2010 qualifier is equivalent to 'extern' - C99 6.2.2p5) and therefore
2011 can never conflict with each other on account of linkage
2012 (6.2.2p4). Multiple definitions are not allowed (6.9p3,5) but
2013 gnu89 mode permits two definitions if one is 'extern inline' and
2014 one is not. The non- extern-inline definition supersedes the
2015 extern-inline definition. */
2017 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2019 /* If you declare a built-in function name as static, or
2020 define the built-in with an old-style definition (so we
2021 can't validate the argument list) the built-in definition is
2022 overridden, but optionally warn this was a bad choice of name. */
2023 if (DECL_BUILT_IN (olddecl
)
2024 && !C_DECL_DECLARED_BUILTIN (olddecl
)
2025 && (!TREE_PUBLIC (newdecl
)
2026 || (DECL_INITIAL (newdecl
)
2027 && !prototype_p (TREE_TYPE (newdecl
)))))
2029 warning (OPT_Wshadow
, "declaration of %q+D shadows "
2030 "a built-in function", newdecl
);
2031 /* Discard the old built-in function. */
2035 if (DECL_INITIAL (newdecl
))
2037 if (DECL_INITIAL (olddecl
))
2039 /* If both decls are in the same TU and the new declaration
2040 isn't overriding an extern inline reject the new decl.
2041 In c99, no overriding is allowed in the same translation
2043 if ((!DECL_EXTERN_INLINE (olddecl
)
2044 || DECL_EXTERN_INLINE (newdecl
)
2045 || (!flag_gnu89_inline
2046 && (!DECL_DECLARED_INLINE_P (olddecl
)
2047 || !lookup_attribute ("gnu_inline",
2048 DECL_ATTRIBUTES (olddecl
)))
2049 && (!DECL_DECLARED_INLINE_P (newdecl
)
2050 || !lookup_attribute ("gnu_inline",
2051 DECL_ATTRIBUTES (newdecl
))))
2053 && same_translation_unit_p (newdecl
, olddecl
))
2055 error ("redefinition of %q+D", newdecl
);
2056 locate_old_decl (olddecl
);
2061 /* If we have a prototype after an old-style function definition,
2062 the argument types must be checked specially. */
2063 else if (DECL_INITIAL (olddecl
)
2064 && !prototype_p (oldtype
) && prototype_p (newtype
)
2065 && TYPE_ACTUAL_ARG_TYPES (oldtype
)
2066 && !validate_proto_after_old_defn (newdecl
, newtype
, oldtype
))
2068 locate_old_decl (olddecl
);
2071 /* A non-static declaration (even an "extern") followed by a
2072 static declaration is undefined behavior per C99 6.2.2p3-5,7.
2073 The same is true for a static forward declaration at block
2074 scope followed by a non-static declaration/definition at file
2075 scope. Static followed by non-static at the same scope is
2076 not undefined behavior, and is the most convenient way to get
2077 some effects (see e.g. what unwind-dw2-fde-glibc.c does to
2078 the definition of _Unwind_Find_FDE in unwind-dw2-fde.c), but
2079 we do diagnose it if -Wtraditional. */
2080 if (TREE_PUBLIC (olddecl
) && !TREE_PUBLIC (newdecl
))
2082 /* Two exceptions to the rule. If olddecl is an extern
2083 inline, or a predeclared function that isn't actually
2084 built in, newdecl silently overrides olddecl. The latter
2085 occur only in Objective C; see also above. (FIXME: Make
2086 Objective C use normal builtins.) */
2087 if (!DECL_IS_BUILTIN (olddecl
)
2088 && !DECL_EXTERN_INLINE (olddecl
))
2090 error ("static declaration of %q+D follows "
2091 "non-static declaration", newdecl
);
2092 locate_old_decl (olddecl
);
2096 else if (TREE_PUBLIC (newdecl
) && !TREE_PUBLIC (olddecl
))
2098 if (DECL_CONTEXT (olddecl
))
2100 error ("non-static declaration of %q+D follows "
2101 "static declaration", newdecl
);
2102 locate_old_decl (olddecl
);
2105 else if (warn_traditional
)
2107 warned
|= warning (OPT_Wtraditional
,
2108 "non-static declaration of %q+D "
2109 "follows static declaration", newdecl
);
2113 /* Make sure gnu_inline attribute is either not present, or
2114 present on all inline decls. */
2115 if (DECL_DECLARED_INLINE_P (olddecl
)
2116 && DECL_DECLARED_INLINE_P (newdecl
))
2118 bool newa
= lookup_attribute ("gnu_inline",
2119 DECL_ATTRIBUTES (newdecl
)) != NULL
;
2120 bool olda
= lookup_attribute ("gnu_inline",
2121 DECL_ATTRIBUTES (olddecl
)) != NULL
;
2124 error_at (input_location
, "%<gnu_inline%> attribute present on %q+D",
2125 newa
? newdecl
: olddecl
);
2126 error_at (DECL_SOURCE_LOCATION (newa
? olddecl
: newdecl
),
2131 else if (TREE_CODE (newdecl
) == VAR_DECL
)
2133 /* Only variables can be thread-local, and all declarations must
2134 agree on this property. */
2135 if (C_DECL_THREADPRIVATE_P (olddecl
) && !DECL_THREAD_LOCAL_P (newdecl
))
2137 /* Nothing to check. Since OLDDECL is marked threadprivate
2138 and NEWDECL does not have a thread-local attribute, we
2139 will merge the threadprivate attribute into NEWDECL. */
2142 else if (DECL_THREAD_LOCAL_P (newdecl
) != DECL_THREAD_LOCAL_P (olddecl
))
2144 if (DECL_THREAD_LOCAL_P (newdecl
))
2145 error ("thread-local declaration of %q+D follows "
2146 "non-thread-local declaration", newdecl
);
2148 error ("non-thread-local declaration of %q+D follows "
2149 "thread-local declaration", newdecl
);
2151 locate_old_decl (olddecl
);
2155 /* Multiple initialized definitions are not allowed (6.9p3,5). */
2156 if (DECL_INITIAL (newdecl
) && DECL_INITIAL (olddecl
))
2158 error ("redefinition of %q+D", newdecl
);
2159 locate_old_decl (olddecl
);
2163 /* Objects declared at file scope: if the first declaration had
2164 external linkage (even if it was an external reference) the
2165 second must have external linkage as well, or the behavior is
2166 undefined. If the first declaration had internal linkage, then
2167 the second must too, or else be an external reference (in which
2168 case the composite declaration still has internal linkage).
2169 As for function declarations, we warn about the static-then-
2170 extern case only for -Wtraditional. See generally 6.2.2p3-5,7. */
2171 if (DECL_FILE_SCOPE_P (newdecl
)
2172 && TREE_PUBLIC (newdecl
) != TREE_PUBLIC (olddecl
))
2174 if (DECL_EXTERNAL (newdecl
))
2176 if (!DECL_FILE_SCOPE_P (olddecl
))
2178 error ("extern declaration of %q+D follows "
2179 "declaration with no linkage", newdecl
);
2180 locate_old_decl (olddecl
);
2183 else if (warn_traditional
)
2185 warned
|= warning (OPT_Wtraditional
,
2186 "non-static declaration of %q+D "
2187 "follows static declaration", newdecl
);
2192 if (TREE_PUBLIC (newdecl
))
2193 error ("non-static declaration of %q+D follows "
2194 "static declaration", newdecl
);
2196 error ("static declaration of %q+D follows "
2197 "non-static declaration", newdecl
);
2199 locate_old_decl (olddecl
);
2203 /* Two objects with the same name declared at the same block
2204 scope must both be external references (6.7p3). */
2205 else if (!DECL_FILE_SCOPE_P (newdecl
))
2207 if (DECL_EXTERNAL (newdecl
))
2209 /* Extern with initializer at block scope, which will
2210 already have received an error. */
2212 else if (DECL_EXTERNAL (olddecl
))
2214 error ("declaration of %q+D with no linkage follows "
2215 "extern declaration", newdecl
);
2216 locate_old_decl (olddecl
);
2220 error ("redeclaration of %q+D with no linkage", newdecl
);
2221 locate_old_decl (olddecl
);
2227 /* C++ does not permit a decl to appear multiple times at file
2230 && DECL_FILE_SCOPE_P (newdecl
)
2231 && !DECL_EXTERNAL (newdecl
)
2232 && !DECL_EXTERNAL (olddecl
))
2233 warned
|= warning_at (DECL_SOURCE_LOCATION (newdecl
),
2235 ("duplicate declaration of %qD is "
2241 /* All decls must agree on a visibility. */
2242 if (CODE_CONTAINS_STRUCT (TREE_CODE (newdecl
), TS_DECL_WITH_VIS
)
2243 && DECL_VISIBILITY_SPECIFIED (newdecl
) && DECL_VISIBILITY_SPECIFIED (olddecl
)
2244 && DECL_VISIBILITY (newdecl
) != DECL_VISIBILITY (olddecl
))
2246 warned
|= warning (0, "redeclaration of %q+D with different visibility "
2247 "(old visibility preserved)", newdecl
);
2250 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2252 /* Diagnose inline __attribute__ ((noinline)) which is silly. */
2253 if (DECL_DECLARED_INLINE_P (newdecl
)
2254 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl
)))
2255 warned
|= warning (OPT_Wattributes
,
2256 "inline declaration of %qD follows "
2257 "declaration with attribute noinline", newdecl
);
2258 else if (DECL_DECLARED_INLINE_P (olddecl
)
2259 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl
)))
2260 warned
|= warning (OPT_Wattributes
,
2261 "declaration of %q+D with attribute "
2262 "noinline follows inline declaration ", newdecl
);
2263 else if (lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl
))
2264 && lookup_attribute ("always_inline", DECL_ATTRIBUTES (olddecl
)))
2265 warned
|= warning (OPT_Wattributes
,
2266 "declaration of %q+D with attribute "
2267 "%qs follows declaration with attribute %qs",
2268 newdecl
, "noinline", "always_inline");
2269 else if (lookup_attribute ("always_inline", DECL_ATTRIBUTES (newdecl
))
2270 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl
)))
2271 warned
|= warning (OPT_Wattributes
,
2272 "declaration of %q+D with attribute "
2273 "%qs follows declaration with attribute %qs",
2274 newdecl
, "always_inline", "noinline");
2275 else if (lookup_attribute ("cold", DECL_ATTRIBUTES (newdecl
))
2276 && lookup_attribute ("hot", DECL_ATTRIBUTES (olddecl
)))
2277 warned
|= warning (OPT_Wattributes
,
2278 "declaration of %q+D with attribute %qs follows "
2279 "declaration with attribute %qs", newdecl
, "cold",
2281 else if (lookup_attribute ("hot", DECL_ATTRIBUTES (newdecl
))
2282 && lookup_attribute ("cold", DECL_ATTRIBUTES (olddecl
)))
2283 warned
|= warning (OPT_Wattributes
,
2284 "declaration of %q+D with attribute %qs follows "
2285 "declaration with attribute %qs", newdecl
, "hot",
2288 else /* PARM_DECL, VAR_DECL */
2290 /* Redeclaration of a parameter is a constraint violation (this is
2291 not explicitly stated, but follows from C99 6.7p3 [no more than
2292 one declaration of the same identifier with no linkage in the
2293 same scope, except type tags] and 6.2.2p6 [parameters have no
2294 linkage]). We must check for a forward parameter declaration,
2295 indicated by TREE_ASM_WRITTEN on the old declaration - this is
2296 an extension, the mandatory diagnostic for which is handled by
2297 mark_forward_parm_decls. */
2299 if (TREE_CODE (newdecl
) == PARM_DECL
2300 && (!TREE_ASM_WRITTEN (olddecl
) || TREE_ASM_WRITTEN (newdecl
)))
2302 error ("redefinition of parameter %q+D", newdecl
);
2303 locate_old_decl (olddecl
);
2308 /* Optional warning for completely redundant decls. */
2309 if (!warned
&& !pedwarned
2310 && warn_redundant_decls
2311 /* Don't warn about a function declaration followed by a
2313 && !(TREE_CODE (newdecl
) == FUNCTION_DECL
2314 && DECL_INITIAL (newdecl
) && !DECL_INITIAL (olddecl
))
2315 /* Don't warn about redundant redeclarations of builtins. */
2316 && !(TREE_CODE (newdecl
) == FUNCTION_DECL
2317 && !DECL_BUILT_IN (newdecl
)
2318 && DECL_BUILT_IN (olddecl
)
2319 && !C_DECL_DECLARED_BUILTIN (olddecl
))
2320 /* Don't warn about an extern followed by a definition. */
2321 && !(DECL_EXTERNAL (olddecl
) && !DECL_EXTERNAL (newdecl
))
2322 /* Don't warn about forward parameter decls. */
2323 && !(TREE_CODE (newdecl
) == PARM_DECL
2324 && TREE_ASM_WRITTEN (olddecl
) && !TREE_ASM_WRITTEN (newdecl
))
2325 /* Don't warn about a variable definition following a declaration. */
2326 && !(TREE_CODE (newdecl
) == VAR_DECL
2327 && DECL_INITIAL (newdecl
) && !DECL_INITIAL (olddecl
)))
2329 warned
= warning (OPT_Wredundant_decls
, "redundant redeclaration of %q+D",
2333 /* Report location of previous decl/defn. */
2334 if (warned
|| pedwarned
)
2335 locate_old_decl (olddecl
);
2337 #undef DECL_EXTERN_INLINE
2342 /* Subroutine of duplicate_decls. NEWDECL has been found to be
2343 consistent with OLDDECL, but carries new information. Merge the
2344 new information into OLDDECL. This function issues no
2348 merge_decls (tree newdecl
, tree olddecl
, tree newtype
, tree oldtype
)
2350 bool new_is_definition
= (TREE_CODE (newdecl
) == FUNCTION_DECL
2351 && DECL_INITIAL (newdecl
) != 0);
2352 bool new_is_prototype
= (TREE_CODE (newdecl
) == FUNCTION_DECL
2353 && prototype_p (TREE_TYPE (newdecl
)));
2354 bool old_is_prototype
= (TREE_CODE (olddecl
) == FUNCTION_DECL
2355 && prototype_p (TREE_TYPE (olddecl
)));
2357 /* For real parm decl following a forward decl, rechain the old decl
2358 in its new location and clear TREE_ASM_WRITTEN (it's not a
2359 forward decl anymore). */
2360 if (TREE_CODE (newdecl
) == PARM_DECL
2361 && TREE_ASM_WRITTEN (olddecl
) && !TREE_ASM_WRITTEN (newdecl
))
2363 struct c_binding
*b
, **here
;
2365 for (here
= ¤t_scope
->bindings
; *here
; here
= &(*here
)->prev
)
2366 if ((*here
)->decl
== olddecl
)
2373 b
->prev
= current_scope
->bindings
;
2374 current_scope
->bindings
= b
;
2376 TREE_ASM_WRITTEN (olddecl
) = 0;
2379 DECL_ATTRIBUTES (newdecl
)
2380 = targetm
.merge_decl_attributes (olddecl
, newdecl
);
2382 /* Merge the data types specified in the two decls. */
2384 = TREE_TYPE (olddecl
)
2385 = composite_type (newtype
, oldtype
);
2387 /* Lay the type out, unless already done. */
2388 if (!comptypes (oldtype
, TREE_TYPE (newdecl
)))
2390 if (TREE_TYPE (newdecl
) != error_mark_node
)
2391 layout_type (TREE_TYPE (newdecl
));
2392 if (TREE_CODE (newdecl
) != FUNCTION_DECL
2393 && TREE_CODE (newdecl
) != TYPE_DECL
2394 && TREE_CODE (newdecl
) != CONST_DECL
)
2395 layout_decl (newdecl
, 0);
2399 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
2400 DECL_SIZE (newdecl
) = DECL_SIZE (olddecl
);
2401 DECL_SIZE_UNIT (newdecl
) = DECL_SIZE_UNIT (olddecl
);
2402 DECL_MODE (newdecl
) = DECL_MODE (olddecl
);
2403 if (DECL_ALIGN (olddecl
) > DECL_ALIGN (newdecl
))
2405 DECL_ALIGN (newdecl
) = DECL_ALIGN (olddecl
);
2406 DECL_USER_ALIGN (newdecl
) |= DECL_USER_ALIGN (olddecl
);
2410 /* Keep the old rtl since we can safely use it. */
2411 if (HAS_RTL_P (olddecl
))
2412 COPY_DECL_RTL (olddecl
, newdecl
);
2414 /* Merge the type qualifiers. */
2415 if (TREE_READONLY (newdecl
))
2416 TREE_READONLY (olddecl
) = 1;
2418 if (TREE_THIS_VOLATILE (newdecl
))
2419 TREE_THIS_VOLATILE (olddecl
) = 1;
2421 /* Merge deprecatedness. */
2422 if (TREE_DEPRECATED (newdecl
))
2423 TREE_DEPRECATED (olddecl
) = 1;
2425 /* If a decl is in a system header and the other isn't, keep the one on the
2426 system header. Otherwise, keep source location of definition rather than
2427 declaration and of prototype rather than non-prototype unless that
2428 prototype is built-in. */
2429 if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl
), TS_DECL_WITH_VIS
)
2430 && DECL_IN_SYSTEM_HEADER (olddecl
)
2431 && !DECL_IN_SYSTEM_HEADER (newdecl
) )
2432 DECL_SOURCE_LOCATION (newdecl
) = DECL_SOURCE_LOCATION (olddecl
);
2433 else if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl
), TS_DECL_WITH_VIS
)
2434 && DECL_IN_SYSTEM_HEADER (newdecl
)
2435 && !DECL_IN_SYSTEM_HEADER (olddecl
))
2436 DECL_SOURCE_LOCATION (olddecl
) = DECL_SOURCE_LOCATION (newdecl
);
2437 else if ((DECL_INITIAL (newdecl
) == 0 && DECL_INITIAL (olddecl
) != 0)
2438 || (old_is_prototype
&& !new_is_prototype
2439 && !C_DECL_BUILTIN_PROTOTYPE (olddecl
)))
2440 DECL_SOURCE_LOCATION (newdecl
) = DECL_SOURCE_LOCATION (olddecl
);
2442 /* Merge the initialization information. */
2443 if (DECL_INITIAL (newdecl
) == 0)
2444 DECL_INITIAL (newdecl
) = DECL_INITIAL (olddecl
);
2446 /* Merge the threadprivate attribute. */
2447 if (TREE_CODE (olddecl
) == VAR_DECL
&& C_DECL_THREADPRIVATE_P (olddecl
))
2448 C_DECL_THREADPRIVATE_P (newdecl
) = 1;
2450 if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl
), TS_DECL_WITH_VIS
))
2452 /* Copy the assembler name.
2453 Currently, it can only be defined in the prototype. */
2454 COPY_DECL_ASSEMBLER_NAME (olddecl
, newdecl
);
2456 /* Use visibility of whichever declaration had it specified */
2457 if (DECL_VISIBILITY_SPECIFIED (olddecl
))
2459 DECL_VISIBILITY (newdecl
) = DECL_VISIBILITY (olddecl
);
2460 DECL_VISIBILITY_SPECIFIED (newdecl
) = 1;
2463 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2465 DECL_STATIC_CONSTRUCTOR(newdecl
) |= DECL_STATIC_CONSTRUCTOR(olddecl
);
2466 DECL_STATIC_DESTRUCTOR (newdecl
) |= DECL_STATIC_DESTRUCTOR (olddecl
);
2467 DECL_NO_LIMIT_STACK (newdecl
) |= DECL_NO_LIMIT_STACK (olddecl
);
2468 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl
)
2469 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl
);
2470 TREE_THIS_VOLATILE (newdecl
) |= TREE_THIS_VOLATILE (olddecl
);
2471 DECL_IS_MALLOC (newdecl
) |= DECL_IS_MALLOC (olddecl
);
2472 DECL_IS_OPERATOR_NEW (newdecl
) |= DECL_IS_OPERATOR_NEW (olddecl
);
2473 TREE_READONLY (newdecl
) |= TREE_READONLY (olddecl
);
2474 DECL_PURE_P (newdecl
) |= DECL_PURE_P (olddecl
);
2475 DECL_IS_NOVOPS (newdecl
) |= DECL_IS_NOVOPS (olddecl
);
2478 /* Merge the storage class information. */
2479 merge_weak (newdecl
, olddecl
);
2481 /* For functions, static overrides non-static. */
2482 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2484 TREE_PUBLIC (newdecl
) &= TREE_PUBLIC (olddecl
);
2485 /* This is since we don't automatically
2486 copy the attributes of NEWDECL into OLDDECL. */
2487 TREE_PUBLIC (olddecl
) = TREE_PUBLIC (newdecl
);
2488 /* If this clears `static', clear it in the identifier too. */
2489 if (!TREE_PUBLIC (olddecl
))
2490 TREE_PUBLIC (DECL_NAME (olddecl
)) = 0;
2494 /* In c99, 'extern' declaration before (or after) 'inline' means this
2495 function is not DECL_EXTERNAL, unless 'gnu_inline' attribute
2497 if (TREE_CODE (newdecl
) == FUNCTION_DECL
2498 && !flag_gnu89_inline
2499 && (DECL_DECLARED_INLINE_P (newdecl
)
2500 || DECL_DECLARED_INLINE_P (olddecl
))
2501 && (!DECL_DECLARED_INLINE_P (newdecl
)
2502 || !DECL_DECLARED_INLINE_P (olddecl
)
2503 || !DECL_EXTERNAL (olddecl
))
2504 && DECL_EXTERNAL (newdecl
)
2505 && !lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (newdecl
))
2506 && !current_function_decl
)
2507 DECL_EXTERNAL (newdecl
) = 0;
2509 /* An inline definition following a static declaration is not
2511 if (new_is_definition
2512 && (DECL_DECLARED_INLINE_P (newdecl
)
2513 || DECL_DECLARED_INLINE_P (olddecl
))
2514 && !TREE_PUBLIC (olddecl
))
2515 DECL_EXTERNAL (newdecl
) = 0;
2517 if (DECL_EXTERNAL (newdecl
))
2519 TREE_STATIC (newdecl
) = TREE_STATIC (olddecl
);
2520 DECL_EXTERNAL (newdecl
) = DECL_EXTERNAL (olddecl
);
2522 /* An extern decl does not override previous storage class. */
2523 TREE_PUBLIC (newdecl
) = TREE_PUBLIC (olddecl
);
2524 if (!DECL_EXTERNAL (newdecl
))
2526 DECL_CONTEXT (newdecl
) = DECL_CONTEXT (olddecl
);
2527 DECL_COMMON (newdecl
) = DECL_COMMON (olddecl
);
2532 TREE_STATIC (olddecl
) = TREE_STATIC (newdecl
);
2533 TREE_PUBLIC (olddecl
) = TREE_PUBLIC (newdecl
);
2536 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2538 /* If we're redefining a function previously defined as extern
2539 inline, make sure we emit debug info for the inline before we
2540 throw it away, in case it was inlined into a function that
2541 hasn't been written out yet. */
2542 if (new_is_definition
&& DECL_INITIAL (olddecl
))
2543 /* The new defn must not be inline. */
2544 DECL_UNINLINABLE (newdecl
) = 1;
2547 /* If either decl says `inline', this fn is inline, unless
2548 its definition was passed already. */
2549 if (DECL_DECLARED_INLINE_P (newdecl
)
2550 || DECL_DECLARED_INLINE_P (olddecl
))
2551 DECL_DECLARED_INLINE_P (newdecl
) = 1;
2553 DECL_UNINLINABLE (newdecl
) = DECL_UNINLINABLE (olddecl
)
2554 = (DECL_UNINLINABLE (newdecl
) || DECL_UNINLINABLE (olddecl
));
2556 DECL_DISREGARD_INLINE_LIMITS (newdecl
)
2557 = DECL_DISREGARD_INLINE_LIMITS (olddecl
)
2558 = (DECL_DISREGARD_INLINE_LIMITS (newdecl
)
2559 || DECL_DISREGARD_INLINE_LIMITS (olddecl
));
2562 if (DECL_BUILT_IN (olddecl
))
2564 /* If redeclaring a builtin function, it stays built in.
2565 But it gets tagged as having been declared. */
2566 DECL_BUILT_IN_CLASS (newdecl
) = DECL_BUILT_IN_CLASS (olddecl
);
2567 DECL_FUNCTION_CODE (newdecl
) = DECL_FUNCTION_CODE (olddecl
);
2568 C_DECL_DECLARED_BUILTIN (newdecl
) = 1;
2569 if (new_is_prototype
)
2571 C_DECL_BUILTIN_PROTOTYPE (newdecl
) = 0;
2572 if (DECL_BUILT_IN_CLASS (newdecl
) == BUILT_IN_NORMAL
)
2574 enum built_in_function fncode
= DECL_FUNCTION_CODE (newdecl
);
2577 /* If a compatible prototype of these builtin functions
2578 is seen, assume the runtime implements it with the
2579 expected semantics. */
2580 case BUILT_IN_STPCPY
:
2581 if (builtin_decl_explicit_p (fncode
))
2582 set_builtin_decl_implicit_p (fncode
, true);
2590 C_DECL_BUILTIN_PROTOTYPE (newdecl
)
2591 = C_DECL_BUILTIN_PROTOTYPE (olddecl
);
2594 /* Preserve function specific target and optimization options */
2595 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl
)
2596 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl
))
2597 DECL_FUNCTION_SPECIFIC_TARGET (newdecl
)
2598 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl
);
2600 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl
)
2601 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl
))
2602 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl
)
2603 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl
);
2605 /* Also preserve various other info from the definition. */
2606 if (!new_is_definition
)
2609 DECL_RESULT (newdecl
) = DECL_RESULT (olddecl
);
2610 DECL_INITIAL (newdecl
) = DECL_INITIAL (olddecl
);
2611 DECL_STRUCT_FUNCTION (newdecl
) = DECL_STRUCT_FUNCTION (olddecl
);
2612 DECL_SAVED_TREE (newdecl
) = DECL_SAVED_TREE (olddecl
);
2613 DECL_ARGUMENTS (newdecl
) = copy_list (DECL_ARGUMENTS (olddecl
));
2614 for (t
= DECL_ARGUMENTS (newdecl
); t
; t
= DECL_CHAIN (t
))
2615 DECL_CONTEXT (t
) = newdecl
;
2617 /* See if we've got a function to instantiate from. */
2618 if (DECL_SAVED_TREE (olddecl
))
2619 DECL_ABSTRACT_ORIGIN (newdecl
)
2620 = DECL_ABSTRACT_ORIGIN (olddecl
);
2624 /* Merge the USED information. */
2625 if (TREE_USED (olddecl
))
2626 TREE_USED (newdecl
) = 1;
2627 else if (TREE_USED (newdecl
))
2628 TREE_USED (olddecl
) = 1;
2629 if (TREE_CODE (olddecl
) == VAR_DECL
|| TREE_CODE (olddecl
) == PARM_DECL
)
2630 DECL_READ_P (newdecl
) |= DECL_READ_P (olddecl
);
2631 if (DECL_PRESERVE_P (olddecl
))
2632 DECL_PRESERVE_P (newdecl
) = 1;
2633 else if (DECL_PRESERVE_P (newdecl
))
2634 DECL_PRESERVE_P (olddecl
) = 1;
2636 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
2637 But preserve OLDDECL's DECL_UID, DECL_CONTEXT and
2638 DECL_ARGUMENTS (if appropriate). */
2640 unsigned olddecl_uid
= DECL_UID (olddecl
);
2641 tree olddecl_context
= DECL_CONTEXT (olddecl
);
2642 tree olddecl_arguments
= NULL
;
2643 if (TREE_CODE (olddecl
) == FUNCTION_DECL
)
2644 olddecl_arguments
= DECL_ARGUMENTS (olddecl
);
2646 memcpy ((char *) olddecl
+ sizeof (struct tree_common
),
2647 (char *) newdecl
+ sizeof (struct tree_common
),
2648 sizeof (struct tree_decl_common
) - sizeof (struct tree_common
));
2649 DECL_USER_ALIGN (olddecl
) = DECL_USER_ALIGN (newdecl
);
2650 switch (TREE_CODE (olddecl
))
2655 struct symtab_node
*snode
= olddecl
->decl_with_vis
.symtab_node
;
2657 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
2658 (char *) newdecl
+ sizeof (struct tree_decl_common
),
2659 tree_code_size (TREE_CODE (olddecl
)) - sizeof (struct tree_decl_common
));
2660 olddecl
->decl_with_vis
.symtab_node
= snode
;
2662 if ((DECL_EXTERNAL (olddecl
)
2663 || TREE_PUBLIC (olddecl
)
2664 || TREE_STATIC (olddecl
))
2665 && DECL_SECTION_NAME (newdecl
) != NULL
)
2666 set_decl_section_name (olddecl
, DECL_SECTION_NAME (newdecl
));
2668 /* This isn't quite correct for something like
2669 int __thread x attribute ((tls_model ("local-exec")));
2670 extern int __thread x;
2671 as we'll lose the "local-exec" model. */
2672 if (TREE_CODE (olddecl
) == VAR_DECL
2673 && DECL_THREAD_LOCAL_P (newdecl
))
2674 set_decl_tls_model (olddecl
, DECL_TLS_MODEL (newdecl
));
2684 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
2685 (char *) newdecl
+ sizeof (struct tree_decl_common
),
2686 tree_code_size (TREE_CODE (olddecl
)) - sizeof (struct tree_decl_common
));
2691 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
2692 (char *) newdecl
+ sizeof (struct tree_decl_common
),
2693 sizeof (struct tree_decl_non_common
) - sizeof (struct tree_decl_common
));
2695 DECL_UID (olddecl
) = olddecl_uid
;
2696 DECL_CONTEXT (olddecl
) = olddecl_context
;
2697 if (TREE_CODE (olddecl
) == FUNCTION_DECL
)
2698 DECL_ARGUMENTS (olddecl
) = olddecl_arguments
;
2701 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2702 so that encode_section_info has a chance to look at the new decl
2703 flags and attributes. */
2704 if (DECL_RTL_SET_P (olddecl
)
2705 && (TREE_CODE (olddecl
) == FUNCTION_DECL
2706 || (TREE_CODE (olddecl
) == VAR_DECL
2707 && TREE_STATIC (olddecl
))))
2708 make_decl_rtl (olddecl
);
2711 /* Handle when a new declaration NEWDECL has the same name as an old
2712 one OLDDECL in the same binding contour. Prints an error message
2715 If safely possible, alter OLDDECL to look like NEWDECL, and return
2716 true. Otherwise, return false. */
2719 duplicate_decls (tree newdecl
, tree olddecl
)
2721 tree newtype
= NULL
, oldtype
= NULL
;
2723 if (!diagnose_mismatched_decls (newdecl
, olddecl
, &newtype
, &oldtype
))
2725 /* Avoid `unused variable' and other warnings for OLDDECL. */
2726 TREE_NO_WARNING (olddecl
) = 1;
2730 merge_decls (newdecl
, olddecl
, newtype
, oldtype
);
2732 /* The NEWDECL will no longer be needed.
2734 Before releasing the node, be sure to remove function from symbol
2735 table that might have been inserted there to record comdat group.
2736 Be sure to however do not free DECL_STRUCT_FUNCTION because this
2737 structure is shared in between NEWDECL and OLDECL. */
2738 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2739 DECL_STRUCT_FUNCTION (newdecl
) = NULL
;
2740 if (TREE_CODE (newdecl
) == FUNCTION_DECL
2741 || TREE_CODE (newdecl
) == VAR_DECL
)
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 && ((TREE_CODE (x
) != FUNCTION_DECL
&& TREE_CODE (x
) != VAR_DECL
)
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 && (TREE_CODE (b
->decl
) == FUNCTION_DECL
2932 || TREE_CODE (b
->decl
) == VAR_DECL
)
2933 && DECL_FILE_SCOPE_P (b
->decl
))
2936 vistype
= TREE_TYPE (visdecl
);
2938 if (scope
!= file_scope
2939 && !DECL_IN_SYSTEM_HEADER (x
))
2940 warning (OPT_Wnested_externs
, "nested extern declaration of %qD", x
);
2942 while (b
&& !B_IN_EXTERNAL_SCOPE (b
))
2944 /* If this decl might be modified, save its type. This is
2945 done here rather than when the decl is first bound
2946 because the type may change after first binding, through
2947 being completed or through attributes being added. If we
2948 encounter multiple such decls, only the first should have
2949 its type saved; the others will already have had their
2950 proper types saved and the types will not have changed as
2951 their scopes will not have been re-entered. */
2952 if (DECL_P (b
->decl
) && DECL_FILE_SCOPE_P (b
->decl
) && !type_saved
)
2954 b
->u
.type
= TREE_TYPE (b
->decl
);
2957 if (B_IN_FILE_SCOPE (b
)
2958 && TREE_CODE (b
->decl
) == VAR_DECL
2959 && TREE_STATIC (b
->decl
)
2960 && TREE_CODE (TREE_TYPE (b
->decl
)) == ARRAY_TYPE
2961 && !TYPE_DOMAIN (TREE_TYPE (b
->decl
))
2962 && TREE_CODE (type
) == ARRAY_TYPE
2963 && TYPE_DOMAIN (type
)
2964 && TYPE_MAX_VALUE (TYPE_DOMAIN (type
))
2965 && !integer_zerop (TYPE_MAX_VALUE (TYPE_DOMAIN (type
))))
2967 /* Array type completed in inner scope, which should be
2968 diagnosed if the completion does not have size 1 and
2969 it does not get completed in the file scope. */
2970 b
->inner_comp
= true;
2975 /* If a matching external declaration has been found, set its
2976 type to the composite of all the types of that declaration.
2977 After the consistency checks, it will be reset to the
2978 composite of the visible types only. */
2979 if (b
&& (TREE_PUBLIC (x
) || same_translation_unit_p (x
, b
->decl
))
2981 TREE_TYPE (b
->decl
) = b
->u
.type
;
2983 /* The point of the same_translation_unit_p check here is,
2984 we want to detect a duplicate decl for a construct like
2985 foo() { extern bar(); } ... static bar(); but not if
2986 they are in different translation units. In any case,
2987 the static does not go in the externals scope. */
2989 && (TREE_PUBLIC (x
) || same_translation_unit_p (x
, b
->decl
))
2990 && duplicate_decls (x
, b
->decl
))
2995 if (comptypes (vistype
, type
))
2996 thistype
= composite_type (vistype
, type
);
2998 thistype
= TREE_TYPE (b
->decl
);
3002 b
->u
.type
= TREE_TYPE (b
->decl
);
3003 if (TREE_CODE (b
->decl
) == FUNCTION_DECL
&& DECL_BUILT_IN (b
->decl
))
3005 = build_type_attribute_variant (thistype
,
3006 TYPE_ATTRIBUTES (b
->u
.type
));
3007 TREE_TYPE (b
->decl
) = thistype
;
3008 bind (name
, b
->decl
, scope
, /*invisible=*/false, /*nested=*/true,
3012 else if (TREE_PUBLIC (x
))
3014 if (visdecl
&& !b
&& duplicate_decls (x
, visdecl
))
3016 /* An external declaration at block scope referring to a
3017 visible entity with internal linkage. The composite
3018 type will already be correct for this scope, so we
3019 just need to fall through to make the declaration in
3026 bind (name
, x
, external_scope
, /*invisible=*/true,
3027 /*nested=*/false, locus
);
3033 if (TREE_CODE (x
) != PARM_DECL
)
3034 warn_if_shadowing (x
);
3036 skip_external_and_shadow_checks
:
3037 if (TREE_CODE (x
) == TYPE_DECL
)
3039 /* So this is a typedef, set its underlying type. */
3040 set_underlying_type (x
);
3042 /* If X is a typedef defined in the current function, record it
3043 for the purpose of implementing the -Wunused-local-typedefs
3045 record_locally_defined_typedef (x
);
3048 bind (name
, x
, scope
, /*invisible=*/false, nested
, locus
);
3050 /* If x's type is incomplete because it's based on a
3051 structure or union which has not yet been fully declared,
3052 attach it to that structure or union type, so we can go
3053 back and complete the variable declaration later, if the
3054 structure or union gets fully declared.
3056 If the input is erroneous, we can have error_mark in the type
3057 slot (e.g. "f(void a, ...)") - that doesn't count as an
3059 if (TREE_TYPE (x
) != error_mark_node
3060 && !COMPLETE_TYPE_P (TREE_TYPE (x
)))
3062 tree element
= TREE_TYPE (x
);
3064 while (TREE_CODE (element
) == ARRAY_TYPE
)
3065 element
= TREE_TYPE (element
);
3066 element
= TYPE_MAIN_VARIANT (element
);
3068 if ((TREE_CODE (element
) == RECORD_TYPE
3069 || TREE_CODE (element
) == UNION_TYPE
)
3070 && (TREE_CODE (x
) != TYPE_DECL
3071 || TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
)
3072 && !COMPLETE_TYPE_P (element
))
3073 C_TYPE_INCOMPLETE_VARS (element
)
3074 = tree_cons (NULL_TREE
, x
, C_TYPE_INCOMPLETE_VARS (element
));
3079 /* Record X as belonging to file scope.
3080 This is used only internally by the Objective-C front end,
3081 and is limited to its needs. duplicate_decls is not called;
3082 if there is any preexisting decl for this identifier, it is an ICE. */
3085 pushdecl_top_level (tree x
)
3088 bool nested
= false;
3089 gcc_assert (TREE_CODE (x
) == VAR_DECL
|| TREE_CODE (x
) == CONST_DECL
);
3091 name
= DECL_NAME (x
);
3093 gcc_assert (TREE_CODE (x
) == CONST_DECL
|| !I_SYMBOL_BINDING (name
));
3095 if (TREE_PUBLIC (x
))
3097 bind (name
, x
, external_scope
, /*invisible=*/true, /*nested=*/false,
3102 bind (name
, x
, file_scope
, /*invisible=*/false, nested
, UNKNOWN_LOCATION
);
3108 implicit_decl_warning (location_t loc
, tree id
, tree olddecl
)
3110 if (warn_implicit_function_declaration
)
3115 warned
= pedwarn (loc
, OPT_Wimplicit_function_declaration
,
3116 "implicit declaration of function %qE", id
);
3118 warned
= warning_at (loc
, OPT_Wimplicit_function_declaration
,
3119 G_("implicit declaration of function %qE"), id
);
3120 if (olddecl
&& warned
)
3121 locate_old_decl (olddecl
);
3125 /* This function represents mapping of a function code FCODE
3126 to its respective header. */
3129 header_for_builtin_fn (enum built_in_function fcode
)
3133 CASE_FLT_FN (BUILT_IN_ACOS
):
3134 CASE_FLT_FN (BUILT_IN_ACOSH
):
3135 CASE_FLT_FN (BUILT_IN_ASIN
):
3136 CASE_FLT_FN (BUILT_IN_ASINH
):
3137 CASE_FLT_FN (BUILT_IN_ATAN
):
3138 CASE_FLT_FN (BUILT_IN_ATANH
):
3139 CASE_FLT_FN (BUILT_IN_ATAN2
):
3140 CASE_FLT_FN (BUILT_IN_CBRT
):
3141 CASE_FLT_FN (BUILT_IN_CEIL
):
3142 CASE_FLT_FN (BUILT_IN_COPYSIGN
):
3143 CASE_FLT_FN (BUILT_IN_COS
):
3144 CASE_FLT_FN (BUILT_IN_COSH
):
3145 CASE_FLT_FN (BUILT_IN_ERF
):
3146 CASE_FLT_FN (BUILT_IN_ERFC
):
3147 CASE_FLT_FN (BUILT_IN_EXP
):
3148 CASE_FLT_FN (BUILT_IN_EXP2
):
3149 CASE_FLT_FN (BUILT_IN_EXPM1
):
3150 CASE_FLT_FN (BUILT_IN_FABS
):
3151 CASE_FLT_FN (BUILT_IN_FDIM
):
3152 CASE_FLT_FN (BUILT_IN_FLOOR
):
3153 CASE_FLT_FN (BUILT_IN_FMA
):
3154 CASE_FLT_FN (BUILT_IN_FMAX
):
3155 CASE_FLT_FN (BUILT_IN_FMIN
):
3156 CASE_FLT_FN (BUILT_IN_FMOD
):
3157 CASE_FLT_FN (BUILT_IN_FREXP
):
3158 CASE_FLT_FN (BUILT_IN_HYPOT
):
3159 CASE_FLT_FN (BUILT_IN_ILOGB
):
3160 CASE_FLT_FN (BUILT_IN_LDEXP
):
3161 CASE_FLT_FN (BUILT_IN_LGAMMA
):
3162 CASE_FLT_FN (BUILT_IN_LLRINT
):
3163 CASE_FLT_FN (BUILT_IN_LLROUND
):
3164 CASE_FLT_FN (BUILT_IN_LOG
):
3165 CASE_FLT_FN (BUILT_IN_LOG10
):
3166 CASE_FLT_FN (BUILT_IN_LOG1P
):
3167 CASE_FLT_FN (BUILT_IN_LOG2
):
3168 CASE_FLT_FN (BUILT_IN_LOGB
):
3169 CASE_FLT_FN (BUILT_IN_LRINT
):
3170 CASE_FLT_FN (BUILT_IN_LROUND
):
3171 CASE_FLT_FN (BUILT_IN_MODF
):
3172 CASE_FLT_FN (BUILT_IN_NAN
):
3173 CASE_FLT_FN (BUILT_IN_NEARBYINT
):
3174 CASE_FLT_FN (BUILT_IN_NEXTAFTER
):
3175 CASE_FLT_FN (BUILT_IN_NEXTTOWARD
):
3176 CASE_FLT_FN (BUILT_IN_POW
):
3177 CASE_FLT_FN (BUILT_IN_REMAINDER
):
3178 CASE_FLT_FN (BUILT_IN_REMQUO
):
3179 CASE_FLT_FN (BUILT_IN_RINT
):
3180 CASE_FLT_FN (BUILT_IN_ROUND
):
3181 CASE_FLT_FN (BUILT_IN_SCALBLN
):
3182 CASE_FLT_FN (BUILT_IN_SCALBN
):
3183 CASE_FLT_FN (BUILT_IN_SIN
):
3184 CASE_FLT_FN (BUILT_IN_SINH
):
3185 CASE_FLT_FN (BUILT_IN_SINCOS
):
3186 CASE_FLT_FN (BUILT_IN_SQRT
):
3187 CASE_FLT_FN (BUILT_IN_TAN
):
3188 CASE_FLT_FN (BUILT_IN_TANH
):
3189 CASE_FLT_FN (BUILT_IN_TGAMMA
):
3190 CASE_FLT_FN (BUILT_IN_TRUNC
):
3191 case BUILT_IN_ISINF
:
3192 case BUILT_IN_ISNAN
:
3194 CASE_FLT_FN (BUILT_IN_CABS
):
3195 CASE_FLT_FN (BUILT_IN_CACOS
):
3196 CASE_FLT_FN (BUILT_IN_CACOSH
):
3197 CASE_FLT_FN (BUILT_IN_CARG
):
3198 CASE_FLT_FN (BUILT_IN_CASIN
):
3199 CASE_FLT_FN (BUILT_IN_CASINH
):
3200 CASE_FLT_FN (BUILT_IN_CATAN
):
3201 CASE_FLT_FN (BUILT_IN_CATANH
):
3202 CASE_FLT_FN (BUILT_IN_CCOS
):
3203 CASE_FLT_FN (BUILT_IN_CCOSH
):
3204 CASE_FLT_FN (BUILT_IN_CEXP
):
3205 CASE_FLT_FN (BUILT_IN_CIMAG
):
3206 CASE_FLT_FN (BUILT_IN_CLOG
):
3207 CASE_FLT_FN (BUILT_IN_CONJ
):
3208 CASE_FLT_FN (BUILT_IN_CPOW
):
3209 CASE_FLT_FN (BUILT_IN_CPROJ
):
3210 CASE_FLT_FN (BUILT_IN_CREAL
):
3211 CASE_FLT_FN (BUILT_IN_CSIN
):
3212 CASE_FLT_FN (BUILT_IN_CSINH
):
3213 CASE_FLT_FN (BUILT_IN_CSQRT
):
3214 CASE_FLT_FN (BUILT_IN_CTAN
):
3215 CASE_FLT_FN (BUILT_IN_CTANH
):
3216 return "<complex.h>";
3217 case BUILT_IN_MEMCHR
:
3218 case BUILT_IN_MEMCMP
:
3219 case BUILT_IN_MEMCPY
:
3220 case BUILT_IN_MEMMOVE
:
3221 case BUILT_IN_MEMSET
:
3222 case BUILT_IN_STRCAT
:
3223 case BUILT_IN_STRCHR
:
3224 case BUILT_IN_STRCMP
:
3225 case BUILT_IN_STRCPY
:
3226 case BUILT_IN_STRCSPN
:
3227 case BUILT_IN_STRLEN
:
3228 case BUILT_IN_STRNCAT
:
3229 case BUILT_IN_STRNCMP
:
3230 case BUILT_IN_STRNCPY
:
3231 case BUILT_IN_STRPBRK
:
3232 case BUILT_IN_STRRCHR
:
3233 case BUILT_IN_STRSPN
:
3234 case BUILT_IN_STRSTR
:
3235 return "<string.h>";
3236 case BUILT_IN_FPRINTF
:
3238 case BUILT_IN_FPUTC
:
3239 case BUILT_IN_FPUTS
:
3240 case BUILT_IN_FSCANF
:
3241 case BUILT_IN_FWRITE
:
3242 case BUILT_IN_PRINTF
:
3243 case BUILT_IN_PUTCHAR
:
3245 case BUILT_IN_SCANF
:
3246 case BUILT_IN_SNPRINTF
:
3247 case BUILT_IN_SPRINTF
:
3248 case BUILT_IN_SSCANF
:
3249 case BUILT_IN_VFPRINTF
:
3250 case BUILT_IN_VFSCANF
:
3251 case BUILT_IN_VPRINTF
:
3252 case BUILT_IN_VSCANF
:
3253 case BUILT_IN_VSNPRINTF
:
3254 case BUILT_IN_VSPRINTF
:
3255 case BUILT_IN_VSSCANF
:
3257 case BUILT_IN_ISALNUM
:
3258 case BUILT_IN_ISALPHA
:
3259 case BUILT_IN_ISBLANK
:
3260 case BUILT_IN_ISCNTRL
:
3261 case BUILT_IN_ISDIGIT
:
3262 case BUILT_IN_ISGRAPH
:
3263 case BUILT_IN_ISLOWER
:
3264 case BUILT_IN_ISPRINT
:
3265 case BUILT_IN_ISPUNCT
:
3266 case BUILT_IN_ISSPACE
:
3267 case BUILT_IN_ISUPPER
:
3268 case BUILT_IN_ISXDIGIT
:
3269 case BUILT_IN_TOLOWER
:
3270 case BUILT_IN_TOUPPER
:
3272 case BUILT_IN_ISWALNUM
:
3273 case BUILT_IN_ISWALPHA
:
3274 case BUILT_IN_ISWBLANK
:
3275 case BUILT_IN_ISWCNTRL
:
3276 case BUILT_IN_ISWDIGIT
:
3277 case BUILT_IN_ISWGRAPH
:
3278 case BUILT_IN_ISWLOWER
:
3279 case BUILT_IN_ISWPRINT
:
3280 case BUILT_IN_ISWPUNCT
:
3281 case BUILT_IN_ISWSPACE
:
3282 case BUILT_IN_ISWUPPER
:
3283 case BUILT_IN_ISWXDIGIT
:
3284 case BUILT_IN_TOWLOWER
:
3285 case BUILT_IN_TOWUPPER
:
3286 return "<wctype.h>";
3287 case BUILT_IN_ABORT
:
3289 case BUILT_IN_CALLOC
:
3293 case BUILT_IN_LLABS
:
3294 case BUILT_IN_MALLOC
:
3295 case BUILT_IN_REALLOC
:
3296 case BUILT_IN__EXIT2
:
3297 case BUILT_IN_ALIGNED_ALLOC
:
3298 return "<stdlib.h>";
3299 case BUILT_IN_IMAXABS
:
3300 return "<inttypes.h>";
3301 case BUILT_IN_STRFTIME
:
3308 /* Generate an implicit declaration for identifier FUNCTIONID at LOC as a
3309 function of type int (). */
3312 implicitly_declare (location_t loc
, tree functionid
)
3314 struct c_binding
*b
;
3318 for (b
= I_SYMBOL_BINDING (functionid
); b
; b
= b
->shadowed
)
3320 if (B_IN_SCOPE (b
, external_scope
))
3329 if (decl
== error_mark_node
)
3332 /* FIXME: Objective-C has weird not-really-builtin functions
3333 which are supposed to be visible automatically. They wind up
3334 in the external scope because they're pushed before the file
3335 scope gets created. Catch this here and rebind them into the
3337 if (!DECL_BUILT_IN (decl
) && DECL_IS_BUILTIN (decl
))
3339 bind (functionid
, decl
, file_scope
,
3340 /*invisible=*/false, /*nested=*/true,
3341 DECL_SOURCE_LOCATION (decl
));
3346 tree newtype
= default_function_type
;
3348 TREE_TYPE (decl
) = b
->u
.type
;
3349 /* Implicit declaration of a function already declared
3350 (somehow) in a different scope, or as a built-in.
3351 If this is the first time this has happened, warn;
3352 then recycle the old declaration but with the new type. */
3353 if (!C_DECL_IMPLICIT (decl
))
3355 implicit_decl_warning (loc
, functionid
, decl
);
3356 C_DECL_IMPLICIT (decl
) = 1;
3358 if (DECL_BUILT_IN (decl
))
3360 newtype
= build_type_attribute_variant (newtype
,
3362 (TREE_TYPE (decl
)));
3363 if (!comptypes (newtype
, TREE_TYPE (decl
)))
3365 bool warned
= warning_at (loc
, 0, "incompatible implicit "
3366 "declaration of built-in "
3367 "function %qD", decl
);
3368 /* See if we can hint which header to include. */
3370 = header_for_builtin_fn (DECL_FUNCTION_CODE (decl
));
3371 if (header
!= NULL
&& warned
)
3372 inform (loc
, "include %qs or provide a declaration of %qD",
3374 newtype
= TREE_TYPE (decl
);
3379 if (!comptypes (newtype
, TREE_TYPE (decl
)))
3381 error_at (loc
, "incompatible implicit declaration of "
3382 "function %qD", decl
);
3383 locate_old_decl (decl
);
3386 b
->u
.type
= TREE_TYPE (decl
);
3387 TREE_TYPE (decl
) = newtype
;
3388 bind (functionid
, decl
, current_scope
,
3389 /*invisible=*/false, /*nested=*/true,
3390 DECL_SOURCE_LOCATION (decl
));
3395 /* Not seen before. */
3396 decl
= build_decl (loc
, FUNCTION_DECL
, functionid
, default_function_type
);
3397 DECL_EXTERNAL (decl
) = 1;
3398 TREE_PUBLIC (decl
) = 1;
3399 C_DECL_IMPLICIT (decl
) = 1;
3400 implicit_decl_warning (loc
, functionid
, 0);
3401 asmspec_tree
= maybe_apply_renaming_pragma (decl
, /*asmname=*/NULL
);
3403 set_user_assembler_name (decl
, TREE_STRING_POINTER (asmspec_tree
));
3405 /* C89 says implicit declarations are in the innermost block.
3406 So we record the decl in the standard fashion. */
3407 decl
= pushdecl (decl
);
3409 /* No need to call objc_check_decl here - it's a function type. */
3410 rest_of_decl_compilation (decl
, 0, 0);
3412 /* Write a record describing this implicit function declaration
3413 to the prototypes file (if requested). */
3414 gen_aux_info_record (decl
, 0, 1, 0);
3416 /* Possibly apply some default attributes to this implicit declaration. */
3417 decl_attributes (&decl
, NULL_TREE
, 0);
3422 /* Issue an error message for a reference to an undeclared variable
3423 ID, including a reference to a builtin outside of function-call
3424 context. Establish a binding of the identifier to error_mark_node
3425 in an appropriate scope, which will suppress further errors for the
3426 same identifier. The error message should be given location LOC. */
3428 undeclared_variable (location_t loc
, tree id
)
3430 static bool already
= false;
3431 struct c_scope
*scope
;
3433 if (current_function_decl
== 0)
3435 error_at (loc
, "%qE undeclared here (not in a function)", id
);
3436 scope
= current_scope
;
3440 if (!objc_diagnose_private_ivar (id
))
3441 error_at (loc
, "%qE undeclared (first use in this function)", id
);
3444 inform (loc
, "each undeclared identifier is reported only"
3445 " once for each function it appears in");
3449 /* If we are parsing old-style parameter decls, current_function_decl
3450 will be nonnull but current_function_scope will be null. */
3451 scope
= current_function_scope
? current_function_scope
: current_scope
;
3453 bind (id
, error_mark_node
, scope
, /*invisible=*/false, /*nested=*/false,
3457 /* Subroutine of lookup_label, declare_label, define_label: construct a
3458 LABEL_DECL with all the proper frills. Also create a struct
3459 c_label_vars initialized for the current scope. */
3462 make_label (location_t location
, tree name
, bool defining
,
3463 struct c_label_vars
**p_label_vars
)
3465 tree label
= build_decl (location
, LABEL_DECL
, name
, void_type_node
);
3466 DECL_CONTEXT (label
) = current_function_decl
;
3467 DECL_MODE (label
) = VOIDmode
;
3469 c_label_vars
*label_vars
= ggc_alloc
<c_label_vars
> ();
3470 label_vars
->shadowed
= NULL
;
3471 set_spot_bindings (&label_vars
->label_bindings
, defining
);
3472 label_vars
->decls_in_scope
= make_tree_vector ();
3473 label_vars
->gotos
= NULL
;
3474 *p_label_vars
= label_vars
;
3479 /* Get the LABEL_DECL corresponding to identifier NAME as a label.
3480 Create one if none exists so far for the current function.
3481 This is called when a label is used in a goto expression or
3482 has its address taken. */
3485 lookup_label (tree name
)
3488 struct c_label_vars
*label_vars
;
3490 if (current_function_scope
== 0)
3492 error ("label %qE referenced outside of any function", name
);
3496 /* Use a label already defined or ref'd with this name, but not if
3497 it is inherited from a containing function and wasn't declared
3499 label
= I_LABEL_DECL (name
);
3500 if (label
&& (DECL_CONTEXT (label
) == current_function_decl
3501 || C_DECLARED_LABEL_FLAG (label
)))
3503 /* If the label has only been declared, update its apparent
3504 location to point here, for better diagnostics if it
3505 turns out not to have been defined. */
3506 if (DECL_INITIAL (label
) == NULL_TREE
)
3507 DECL_SOURCE_LOCATION (label
) = input_location
;
3511 /* No label binding for that identifier; make one. */
3512 label
= make_label (input_location
, name
, false, &label_vars
);
3514 /* Ordinary labels go in the current function scope. */
3515 bind_label (name
, label
, current_function_scope
, label_vars
);
3520 /* Issue a warning about DECL for a goto statement at GOTO_LOC going
3524 warn_about_goto (location_t goto_loc
, tree label
, tree decl
)
3526 if (variably_modified_type_p (TREE_TYPE (decl
), NULL_TREE
))
3528 "jump into scope of identifier with variably modified type");
3530 warning_at (goto_loc
, OPT_Wjump_misses_init
,
3531 "jump skips variable initialization");
3532 inform (DECL_SOURCE_LOCATION (label
), "label %qD defined here", label
);
3533 inform (DECL_SOURCE_LOCATION (decl
), "%qD declared here", decl
);
3536 /* Look up a label because of a goto statement. This is like
3537 lookup_label, but also issues any appropriate warnings. */
3540 lookup_label_for_goto (location_t loc
, tree name
)
3543 struct c_label_vars
*label_vars
;
3547 label
= lookup_label (name
);
3548 if (label
== NULL_TREE
)
3551 /* If we are jumping to a different function, we can't issue any
3553 if (DECL_CONTEXT (label
) != current_function_decl
)
3555 gcc_assert (C_DECLARED_LABEL_FLAG (label
));
3559 label_vars
= I_LABEL_BINDING (name
)->u
.label
;
3561 /* If the label has not yet been defined, then push this goto on a
3562 list for possible later warnings. */
3563 if (label_vars
->label_bindings
.scope
== NULL
)
3565 c_goto_bindings
*g
= ggc_alloc
<c_goto_bindings
> ();
3568 set_spot_bindings (&g
->goto_bindings
, true);
3569 vec_safe_push (label_vars
->gotos
, g
);
3573 /* If there are any decls in label_vars->decls_in_scope, then this
3574 goto has missed the declaration of the decl. This happens for a
3580 Issue a warning or error. */
3581 FOR_EACH_VEC_SAFE_ELT (label_vars
->decls_in_scope
, ix
, decl
)
3582 warn_about_goto (loc
, label
, decl
);
3584 if (label_vars
->label_bindings
.left_stmt_expr
)
3586 error_at (loc
, "jump into statement expression");
3587 inform (DECL_SOURCE_LOCATION (label
), "label %qD defined here", label
);
3593 /* Make a label named NAME in the current function, shadowing silently
3594 any that may be inherited from containing functions or containing
3595 scopes. This is called for __label__ declarations. */
3598 declare_label (tree name
)
3600 struct c_binding
*b
= I_LABEL_BINDING (name
);
3602 struct c_label_vars
*label_vars
;
3604 /* Check to make sure that the label hasn't already been declared
3606 if (b
&& B_IN_CURRENT_SCOPE (b
))
3608 error ("duplicate label declaration %qE", name
);
3609 locate_old_decl (b
->decl
);
3611 /* Just use the previous declaration. */
3615 label
= make_label (input_location
, name
, false, &label_vars
);
3616 C_DECLARED_LABEL_FLAG (label
) = 1;
3618 /* Declared labels go in the current scope. */
3619 bind_label (name
, label
, current_scope
, label_vars
);
3624 /* When we define a label, issue any appropriate warnings if there are
3625 any gotos earlier in the function which jump to this label. */
3628 check_earlier_gotos (tree label
, struct c_label_vars
* label_vars
)
3631 struct c_goto_bindings
*g
;
3633 FOR_EACH_VEC_SAFE_ELT (label_vars
->gotos
, ix
, g
)
3635 struct c_binding
*b
;
3636 struct c_scope
*scope
;
3638 /* We have a goto to this label. The goto is going forward. In
3639 g->scope, the goto is going to skip any binding which was
3640 defined after g->bindings_in_scope. */
3641 if (g
->goto_bindings
.scope
->has_jump_unsafe_decl
)
3643 for (b
= g
->goto_bindings
.scope
->bindings
;
3644 b
!= g
->goto_bindings
.bindings_in_scope
;
3647 if (decl_jump_unsafe (b
->decl
))
3648 warn_about_goto (g
->loc
, label
, b
->decl
);
3652 /* We also need to warn about decls defined in any scopes
3653 between the scope of the label and the scope of the goto. */
3654 for (scope
= label_vars
->label_bindings
.scope
;
3655 scope
!= g
->goto_bindings
.scope
;
3656 scope
= scope
->outer
)
3658 gcc_assert (scope
!= NULL
);
3659 if (scope
->has_jump_unsafe_decl
)
3661 if (scope
== label_vars
->label_bindings
.scope
)
3662 b
= label_vars
->label_bindings
.bindings_in_scope
;
3664 b
= scope
->bindings
;
3665 for (; b
!= NULL
; b
= b
->prev
)
3667 if (decl_jump_unsafe (b
->decl
))
3668 warn_about_goto (g
->loc
, label
, b
->decl
);
3673 if (g
->goto_bindings
.stmt_exprs
> 0)
3675 error_at (g
->loc
, "jump into statement expression");
3676 inform (DECL_SOURCE_LOCATION (label
), "label %qD defined here",
3681 /* Now that the label is defined, we will issue warnings about
3682 subsequent gotos to this label when we see them. */
3683 vec_safe_truncate (label_vars
->gotos
, 0);
3684 label_vars
->gotos
= NULL
;
3687 /* Define a label, specifying the location in the source file.
3688 Return the LABEL_DECL node for the label, if the definition is valid.
3689 Otherwise return 0. */
3692 define_label (location_t location
, tree name
)
3694 /* Find any preexisting label with this name. It is an error
3695 if that label has already been defined in this function, or
3696 if there is a containing function with a declared label with
3698 tree label
= I_LABEL_DECL (name
);
3701 && ((DECL_CONTEXT (label
) == current_function_decl
3702 && DECL_INITIAL (label
) != 0)
3703 || (DECL_CONTEXT (label
) != current_function_decl
3704 && C_DECLARED_LABEL_FLAG (label
))))
3706 error_at (location
, "duplicate label %qD", label
);
3707 locate_old_decl (label
);
3710 else if (label
&& DECL_CONTEXT (label
) == current_function_decl
)
3712 struct c_label_vars
*label_vars
= I_LABEL_BINDING (name
)->u
.label
;
3714 /* The label has been used or declared already in this function,
3715 but not defined. Update its location to point to this
3717 DECL_SOURCE_LOCATION (label
) = location
;
3718 set_spot_bindings (&label_vars
->label_bindings
, true);
3720 /* Issue warnings as required about any goto statements from
3721 earlier in the function. */
3722 check_earlier_gotos (label
, label_vars
);
3726 struct c_label_vars
*label_vars
;
3728 /* No label binding for that identifier; make one. */
3729 label
= make_label (location
, name
, true, &label_vars
);
3731 /* Ordinary labels go in the current function scope. */
3732 bind_label (name
, label
, current_function_scope
, label_vars
);
3735 if (!in_system_header_at (input_location
) && lookup_name (name
))
3736 warning_at (location
, OPT_Wtraditional
,
3737 "traditional C lacks a separate namespace "
3738 "for labels, identifier %qE conflicts", name
);
3740 /* Mark label as having been defined. */
3741 DECL_INITIAL (label
) = error_mark_node
;
3745 /* Get the bindings for a new switch statement. This is used to issue
3746 warnings as appropriate for jumps from the switch to case or
3749 struct c_spot_bindings
*
3750 c_get_switch_bindings (void)
3752 struct c_spot_bindings
*switch_bindings
;
3754 switch_bindings
= XNEW (struct c_spot_bindings
);
3755 set_spot_bindings (switch_bindings
, true);
3756 return switch_bindings
;
3760 c_release_switch_bindings (struct c_spot_bindings
*bindings
)
3762 gcc_assert (bindings
->stmt_exprs
== 0 && !bindings
->left_stmt_expr
);
3766 /* This is called at the point of a case or default label to issue
3767 warnings about decls as needed. It returns true if it found an
3768 error, not just a warning. */
3771 c_check_switch_jump_warnings (struct c_spot_bindings
*switch_bindings
,
3772 location_t switch_loc
, location_t case_loc
)
3775 struct c_scope
*scope
;
3778 for (scope
= current_scope
;
3779 scope
!= switch_bindings
->scope
;
3780 scope
= scope
->outer
)
3782 struct c_binding
*b
;
3784 gcc_assert (scope
!= NULL
);
3786 if (!scope
->has_jump_unsafe_decl
)
3789 for (b
= scope
->bindings
; b
!= NULL
; b
= b
->prev
)
3791 if (decl_jump_unsafe (b
->decl
))
3793 if (variably_modified_type_p (TREE_TYPE (b
->decl
), NULL_TREE
))
3797 ("switch jumps into scope of identifier with "
3798 "variably modified type"));
3801 warning_at (case_loc
, OPT_Wjump_misses_init
,
3802 "switch jumps over variable initialization");
3803 inform (switch_loc
, "switch starts here");
3804 inform (DECL_SOURCE_LOCATION (b
->decl
), "%qD declared here",
3810 if (switch_bindings
->stmt_exprs
> 0)
3813 error_at (case_loc
, "switch jumps into statement expression");
3814 inform (switch_loc
, "switch starts here");
3820 /* Given NAME, an IDENTIFIER_NODE,
3821 return the structure (or union or enum) definition for that name.
3822 If THISLEVEL_ONLY is nonzero, searches only the current_scope.
3823 CODE says which kind of type the caller wants;
3824 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
3825 If PLOC is not NULL and this returns non-null, it sets *PLOC to the
3826 location where the tag was defined.
3827 If the wrong kind of type is found, an error is reported. */
3830 lookup_tag (enum tree_code code
, tree name
, int thislevel_only
,
3833 struct c_binding
*b
= I_TAG_BINDING (name
);
3839 /* We only care about whether it's in this level if
3840 thislevel_only was set or it might be a type clash. */
3841 if (thislevel_only
|| TREE_CODE (b
->decl
) != code
)
3843 /* For our purposes, a tag in the external scope is the same as
3844 a tag in the file scope. (Primarily relevant to Objective-C
3845 and its builtin structure tags, which get pushed before the
3846 file scope is created.) */
3847 if (B_IN_CURRENT_SCOPE (b
)
3848 || (current_scope
== file_scope
&& B_IN_EXTERNAL_SCOPE (b
)))
3852 if (thislevel_only
&& !thislevel
)
3855 if (TREE_CODE (b
->decl
) != code
)
3857 /* Definition isn't the kind we were looking for. */
3858 pending_invalid_xref
= name
;
3859 pending_invalid_xref_location
= input_location
;
3861 /* If in the same binding level as a declaration as a tag
3862 of a different type, this must not be allowed to
3863 shadow that tag, so give the error immediately.
3864 (For example, "struct foo; union foo;" is invalid.) */
3866 pending_xref_error ();
3875 /* Print an error message now
3876 for a recent invalid struct, union or enum cross reference.
3877 We don't print them immediately because they are not invalid
3878 when used in the `struct foo;' construct for shadowing. */
3881 pending_xref_error (void)
3883 if (pending_invalid_xref
!= 0)
3884 error_at (pending_invalid_xref_location
, "%qE defined as wrong kind of tag",
3885 pending_invalid_xref
);
3886 pending_invalid_xref
= 0;
3890 /* Look up NAME in the current scope and its superiors
3891 in the namespace of variables, functions and typedefs.
3892 Return a ..._DECL node of some kind representing its definition,
3893 or return 0 if it is undefined. */
3896 lookup_name (tree name
)
3898 struct c_binding
*b
= I_SYMBOL_BINDING (name
);
3899 if (b
&& !b
->invisible
)
3901 maybe_record_typedef_use (b
->decl
);
3907 /* Similar to `lookup_name' but look only at the indicated scope. */
3910 lookup_name_in_scope (tree name
, struct c_scope
*scope
)
3912 struct c_binding
*b
;
3914 for (b
= I_SYMBOL_BINDING (name
); b
; b
= b
->shadowed
)
3915 if (B_IN_SCOPE (b
, scope
))
3920 /* Create the predefined scalar types of C,
3921 and some nodes representing standard constants (0, 1, (void *) 0).
3922 Initialize the global scope.
3923 Make definitions for built-in primitive functions. */
3926 c_init_decl_processing (void)
3928 location_t save_loc
= input_location
;
3930 /* Initialize reserved words for parser. */
3933 current_function_decl
= 0;
3935 gcc_obstack_init (&parser_obstack
);
3937 /* Make the externals scope. */
3939 external_scope
= current_scope
;
3941 /* Declarations from c_common_nodes_and_builtins must not be associated
3942 with this input file, lest we get differences between using and not
3943 using preprocessed headers. */
3944 input_location
= BUILTINS_LOCATION
;
3946 c_common_nodes_and_builtins ();
3948 /* In C, comparisons and TRUTH_* expressions have type int. */
3949 truthvalue_type_node
= integer_type_node
;
3950 truthvalue_true_node
= integer_one_node
;
3951 truthvalue_false_node
= integer_zero_node
;
3953 /* Even in C99, which has a real boolean type. */
3954 pushdecl (build_decl (UNKNOWN_LOCATION
, TYPE_DECL
, get_identifier ("_Bool"),
3955 boolean_type_node
));
3957 input_location
= save_loc
;
3959 make_fname_decl
= c_make_fname_decl
;
3960 start_fname_decls ();
3963 /* Create the VAR_DECL at LOC for __FUNCTION__ etc. ID is the name to
3964 give the decl, NAME is the initialization string and TYPE_DEP
3965 indicates whether NAME depended on the type of the function. As we
3966 don't yet implement delayed emission of static data, we mark the
3967 decl as emitted so it is not placed in the output. Anything using
3968 it must therefore pull out the STRING_CST initializer directly.
3972 c_make_fname_decl (location_t loc
, tree id
, int type_dep
)
3974 const char *name
= fname_as_string (type_dep
);
3975 tree decl
, type
, init
;
3976 size_t length
= strlen (name
);
3978 type
= build_array_type (char_type_node
,
3979 build_index_type (size_int (length
)));
3980 type
= c_build_qualified_type (type
, TYPE_QUAL_CONST
);
3982 decl
= build_decl (loc
, VAR_DECL
, id
, type
);
3984 TREE_STATIC (decl
) = 1;
3985 TREE_READONLY (decl
) = 1;
3986 DECL_ARTIFICIAL (decl
) = 1;
3988 init
= build_string (length
+ 1, name
);
3989 free (CONST_CAST (char *, name
));
3990 TREE_TYPE (init
) = type
;
3991 DECL_INITIAL (decl
) = init
;
3993 TREE_USED (decl
) = 1;
3995 if (current_function_decl
3996 /* For invalid programs like this:
3999 const char* p = __FUNCTION__;
4001 the __FUNCTION__ is believed to appear in K&R style function
4002 parameter declarator. In that case we still don't have
4004 && (!seen_error () || current_function_scope
))
4006 DECL_CONTEXT (decl
) = current_function_decl
;
4007 bind (id
, decl
, current_function_scope
,
4008 /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION
);
4011 finish_decl (decl
, loc
, init
, NULL_TREE
, NULL_TREE
);
4017 c_builtin_function (tree decl
)
4019 tree type
= TREE_TYPE (decl
);
4020 tree id
= DECL_NAME (decl
);
4022 const char *name
= IDENTIFIER_POINTER (id
);
4023 C_DECL_BUILTIN_PROTOTYPE (decl
) = prototype_p (type
);
4025 /* Should never be called on a symbol with a preexisting meaning. */
4026 gcc_assert (!I_SYMBOL_BINDING (id
));
4028 bind (id
, decl
, external_scope
, /*invisible=*/true, /*nested=*/false,
4031 /* Builtins in the implementation namespace are made visible without
4032 needing to be explicitly declared. See push_file_scope. */
4033 if (name
[0] == '_' && (name
[1] == '_' || ISUPPER (name
[1])))
4035 DECL_CHAIN (decl
) = visible_builtins
;
4036 visible_builtins
= decl
;
4043 c_builtin_function_ext_scope (tree decl
)
4045 tree type
= TREE_TYPE (decl
);
4046 tree id
= DECL_NAME (decl
);
4048 const char *name
= IDENTIFIER_POINTER (id
);
4049 C_DECL_BUILTIN_PROTOTYPE (decl
) = prototype_p (type
);
4052 bind (id
, decl
, external_scope
, /*invisible=*/false, /*nested=*/false,
4055 /* Builtins in the implementation namespace are made visible without
4056 needing to be explicitly declared. See push_file_scope. */
4057 if (name
[0] == '_' && (name
[1] == '_' || ISUPPER (name
[1])))
4059 DECL_CHAIN (decl
) = visible_builtins
;
4060 visible_builtins
= decl
;
4066 /* Called when a declaration is seen that contains no names to declare.
4067 If its type is a reference to a structure, union or enum inherited
4068 from a containing scope, shadow that tag name for the current scope
4069 with a forward reference.
4070 If its type defines a new named structure or union
4071 or defines an enum, it is valid but we need not do anything here.
4072 Otherwise, it is an error. */
4075 shadow_tag (const struct c_declspecs
*declspecs
)
4077 shadow_tag_warned (declspecs
, 0);
4080 /* WARNED is 1 if we have done a pedwarn, 2 if we have done a warning,
4083 shadow_tag_warned (const struct c_declspecs
*declspecs
, int warned
)
4085 bool found_tag
= false;
4087 if (declspecs
->type
&& !declspecs
->default_int_p
&& !declspecs
->typedef_p
)
4089 tree value
= declspecs
->type
;
4090 enum tree_code code
= TREE_CODE (value
);
4092 if (code
== RECORD_TYPE
|| code
== UNION_TYPE
|| code
== ENUMERAL_TYPE
)
4093 /* Used to test also that TYPE_SIZE (value) != 0.
4094 That caused warning for `struct foo;' at top level in the file. */
4096 tree name
= TYPE_NAME (value
);
4101 if (declspecs
->restrict_p
)
4103 error ("invalid use of %<restrict%>");
4109 if (warned
!= 1 && code
!= ENUMERAL_TYPE
)
4110 /* Empty unnamed enum OK */
4112 pedwarn (input_location
, 0,
4113 "unnamed struct/union that defines no instances");
4117 else if (declspecs
->typespec_kind
!= ctsk_tagdef
4118 && declspecs
->typespec_kind
!= ctsk_tagfirstref
4119 && declspecs
->storage_class
!= csc_none
)
4122 pedwarn (input_location
, 0,
4123 "empty declaration with storage class specifier "
4124 "does not redeclare tag");
4126 pending_xref_error ();
4128 else if (declspecs
->typespec_kind
!= ctsk_tagdef
4129 && declspecs
->typespec_kind
!= ctsk_tagfirstref
4130 && (declspecs
->const_p
4131 || declspecs
->volatile_p
4132 || declspecs
->atomic_p
4133 || declspecs
->restrict_p
4134 || declspecs
->address_space
))
4137 pedwarn (input_location
, 0,
4138 "empty declaration with type qualifier "
4139 "does not redeclare tag");
4141 pending_xref_error ();
4143 else if (declspecs
->typespec_kind
!= ctsk_tagdef
4144 && declspecs
->typespec_kind
!= ctsk_tagfirstref
4145 && declspecs
->alignas_p
)
4148 pedwarn (input_location
, 0,
4149 "empty declaration with %<_Alignas%> "
4150 "does not redeclare tag");
4152 pending_xref_error ();
4156 pending_invalid_xref
= 0;
4157 t
= lookup_tag (code
, name
, 1, NULL
);
4161 t
= make_node (code
);
4162 pushtag (input_location
, name
, t
);
4168 if (warned
!= 1 && !in_system_header_at (input_location
))
4170 pedwarn (input_location
, 0,
4171 "useless type name in empty declaration");
4176 else if (warned
!= 1 && !in_system_header_at (input_location
)
4177 && declspecs
->typedef_p
)
4179 pedwarn (input_location
, 0, "useless type name in empty declaration");
4183 pending_invalid_xref
= 0;
4185 if (declspecs
->inline_p
)
4187 error ("%<inline%> in empty declaration");
4191 if (declspecs
->noreturn_p
)
4193 error ("%<_Noreturn%> in empty declaration");
4197 if (current_scope
== file_scope
&& declspecs
->storage_class
== csc_auto
)
4199 error ("%<auto%> in file-scope empty declaration");
4203 if (current_scope
== file_scope
&& declspecs
->storage_class
== csc_register
)
4205 error ("%<register%> in file-scope empty declaration");
4209 if (!warned
&& !in_system_header_at (input_location
)
4210 && declspecs
->storage_class
!= csc_none
)
4212 warning (0, "useless storage class specifier in empty declaration");
4216 if (!warned
&& !in_system_header_at (input_location
) && declspecs
->thread_p
)
4218 warning (0, "useless %qs in empty declaration",
4219 declspecs
->thread_gnu_p
? "__thread" : "_Thread_local");
4224 && !in_system_header_at (input_location
)
4225 && (declspecs
->const_p
4226 || declspecs
->volatile_p
4227 || declspecs
->atomic_p
4228 || declspecs
->restrict_p
4229 || declspecs
->address_space
))
4231 warning (0, "useless type qualifier in empty declaration");
4235 if (!warned
&& !in_system_header_at (input_location
)
4236 && declspecs
->alignas_p
)
4238 warning (0, "useless %<_Alignas%> in empty declaration");
4245 pedwarn (input_location
, 0, "empty declaration");
4250 /* Return the qualifiers from SPECS as a bitwise OR of TYPE_QUAL_*
4251 bits. SPECS represents declaration specifiers that the grammar
4252 only permits to contain type qualifiers and attributes. */
4255 quals_from_declspecs (const struct c_declspecs
*specs
)
4257 int quals
= ((specs
->const_p
? TYPE_QUAL_CONST
: 0)
4258 | (specs
->volatile_p
? TYPE_QUAL_VOLATILE
: 0)
4259 | (specs
->restrict_p
? TYPE_QUAL_RESTRICT
: 0)
4260 | (specs
->atomic_p
? TYPE_QUAL_ATOMIC
: 0)
4261 | (ENCODE_QUAL_ADDR_SPACE (specs
->address_space
)));
4262 gcc_assert (!specs
->type
4263 && !specs
->decl_attr
4264 && specs
->typespec_word
== cts_none
4265 && specs
->storage_class
== csc_none
4266 && !specs
->typedef_p
4267 && !specs
->explicit_signed_p
4268 && !specs
->deprecated_p
4270 && !specs
->long_long_p
4273 && !specs
->unsigned_p
4274 && !specs
->complex_p
4276 && !specs
->noreturn_p
4277 && !specs
->thread_p
);
4281 /* Construct an array declarator. LOC is the location of the
4282 beginning of the array (usually the opening brace). EXPR is the
4283 expression inside [], or NULL_TREE. QUALS are the type qualifiers
4284 inside the [] (to be applied to the pointer to which a parameter
4285 array is converted). STATIC_P is true if "static" is inside the
4286 [], false otherwise. VLA_UNSPEC_P is true if the array is [*], a
4287 VLA of unspecified length which is nevertheless a complete type,
4288 false otherwise. The field for the contained declarator is left to
4289 be filled in by set_array_declarator_inner. */
4291 struct c_declarator
*
4292 build_array_declarator (location_t loc
,
4293 tree expr
, struct c_declspecs
*quals
, bool static_p
,
4296 struct c_declarator
*declarator
= XOBNEW (&parser_obstack
,
4297 struct c_declarator
);
4298 declarator
->id_loc
= loc
;
4299 declarator
->kind
= cdk_array
;
4300 declarator
->declarator
= 0;
4301 declarator
->u
.array
.dimen
= expr
;
4304 declarator
->u
.array
.attrs
= quals
->attrs
;
4305 declarator
->u
.array
.quals
= quals_from_declspecs (quals
);
4309 declarator
->u
.array
.attrs
= NULL_TREE
;
4310 declarator
->u
.array
.quals
= 0;
4312 declarator
->u
.array
.static_p
= static_p
;
4313 declarator
->u
.array
.vla_unspec_p
= vla_unspec_p
;
4314 if (static_p
|| quals
!= NULL
)
4315 pedwarn_c90 (loc
, OPT_Wpedantic
,
4316 "ISO C90 does not support %<static%> or type "
4317 "qualifiers in parameter array declarators");
4319 pedwarn_c90 (loc
, OPT_Wpedantic
,
4320 "ISO C90 does not support %<[*]%> array declarators");
4323 if (!current_scope
->parm_flag
)
4326 error_at (loc
, "%<[*]%> not allowed in other than "
4327 "function prototype scope");
4328 declarator
->u
.array
.vla_unspec_p
= false;
4331 current_scope
->had_vla_unspec
= true;
4336 /* Set the contained declarator of an array declarator. DECL is the
4337 declarator, as constructed by build_array_declarator; INNER is what
4338 appears on the left of the []. */
4340 struct c_declarator
*
4341 set_array_declarator_inner (struct c_declarator
*decl
,
4342 struct c_declarator
*inner
)
4344 decl
->declarator
= inner
;
4348 /* INIT is a constructor that forms DECL's initializer. If the final
4349 element initializes a flexible array field, add the size of that
4350 initializer to DECL's size. */
4353 add_flexible_array_elts_to_size (tree decl
, tree init
)
4357 if (vec_safe_is_empty (CONSTRUCTOR_ELTS (init
)))
4360 elt
= CONSTRUCTOR_ELTS (init
)->last ().value
;
4361 type
= TREE_TYPE (elt
);
4362 if (TREE_CODE (type
) == ARRAY_TYPE
4363 && TYPE_SIZE (type
) == NULL_TREE
4364 && TYPE_DOMAIN (type
) != NULL_TREE
4365 && TYPE_MAX_VALUE (TYPE_DOMAIN (type
)) == NULL_TREE
)
4367 complete_array_type (&type
, elt
, false);
4369 = size_binop (PLUS_EXPR
, DECL_SIZE (decl
), TYPE_SIZE (type
));
4370 DECL_SIZE_UNIT (decl
)
4371 = size_binop (PLUS_EXPR
, DECL_SIZE_UNIT (decl
), TYPE_SIZE_UNIT (type
));
4375 /* Decode a "typename", such as "int **", returning a ..._TYPE node.
4376 Set *EXPR, if EXPR not NULL, to any expression to be evaluated
4377 before the type name, and set *EXPR_CONST_OPERANDS, if
4378 EXPR_CONST_OPERANDS not NULL, to indicate whether the type name may
4379 appear in a constant expression. */
4382 groktypename (struct c_type_name
*type_name
, tree
*expr
,
4383 bool *expr_const_operands
)
4386 tree attrs
= type_name
->specs
->attrs
;
4388 type_name
->specs
->attrs
= NULL_TREE
;
4390 type
= grokdeclarator (type_name
->declarator
, type_name
->specs
, TYPENAME
,
4391 false, NULL
, &attrs
, expr
, expr_const_operands
,
4394 /* Apply attributes. */
4395 decl_attributes (&type
, attrs
, 0);
4400 /* Wrapper for decl_attributes that adds some implicit attributes
4401 to VAR_DECLs or FUNCTION_DECLs. */
4404 c_decl_attributes (tree
*node
, tree attributes
, int flags
)
4406 /* Add implicit "omp declare target" attribute if requested. */
4407 if (current_omp_declare_target_attribute
4408 && ((TREE_CODE (*node
) == VAR_DECL
&& TREE_STATIC (*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
,
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 && (TREE_CODE (decl
) == VAR_DECL
4619 || TREE_CODE (decl
) == FUNCTION_DECL
))
4620 objc_check_global_decl (decl
);
4622 /* Add this decl to the current scope.
4623 TEM may equal DECL or it may be a previous decl of the same name. */
4624 tem
= pushdecl (decl
);
4626 if (initialized
&& DECL_EXTERNAL (tem
))
4628 DECL_EXTERNAL (tem
) = 0;
4629 TREE_STATIC (tem
) = 1;
4635 /* Subroutine of finish_decl. TYPE is the type of an uninitialized object
4636 DECL or the non-array element type if DECL is an uninitialized array.
4637 If that type has a const member, diagnose this. */
4640 diagnose_uninitialized_cst_member (tree decl
, tree type
)
4643 for (field
= TYPE_FIELDS (type
); field
; field
= TREE_CHAIN (field
))
4646 if (TREE_CODE (field
) != FIELD_DECL
)
4648 field_type
= strip_array_types (TREE_TYPE (field
));
4650 if (TYPE_QUALS (field_type
) & TYPE_QUAL_CONST
)
4652 warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wc___compat
,
4653 "uninitialized const member in %qT is invalid in C++",
4654 strip_array_types (TREE_TYPE (decl
)));
4655 inform (DECL_SOURCE_LOCATION (field
), "%qD should be initialized", field
);
4658 if (TREE_CODE (field_type
) == RECORD_TYPE
4659 || TREE_CODE (field_type
) == UNION_TYPE
)
4660 diagnose_uninitialized_cst_member (decl
, field_type
);
4664 /* Finish processing of a declaration;
4665 install its initial value.
4666 If ORIGTYPE is not NULL_TREE, it is the original type of INIT.
4667 If the length of an array type is not known before,
4668 it must be determined now, from the initial value, or it is an error.
4670 INIT_LOC is the location of the initial value. */
4673 finish_decl (tree decl
, location_t init_loc
, tree init
,
4674 tree origtype
, tree asmspec_tree
)
4677 bool was_incomplete
= (DECL_SIZE (decl
) == 0);
4678 const char *asmspec
= 0;
4680 /* If a name was specified, get the string. */
4681 if ((TREE_CODE (decl
) == FUNCTION_DECL
|| TREE_CODE (decl
) == VAR_DECL
)
4682 && DECL_FILE_SCOPE_P (decl
))
4683 asmspec_tree
= maybe_apply_renaming_pragma (decl
, asmspec_tree
);
4685 asmspec
= TREE_STRING_POINTER (asmspec_tree
);
4687 if (TREE_CODE (decl
) == VAR_DECL
4688 && TREE_STATIC (decl
)
4689 && global_bindings_p ())
4690 /* So decl is a global variable. Record the types it uses
4691 so that we can decide later to emit debug info for them. */
4692 record_types_used_by_current_var_decl (decl
);
4694 /* If `start_decl' didn't like having an initialization, ignore it now. */
4695 if (init
!= 0 && DECL_INITIAL (decl
) == 0)
4698 /* Don't crash if parm is initialized. */
4699 if (TREE_CODE (decl
) == PARM_DECL
)
4703 store_init_value (init_loc
, decl
, init
, origtype
);
4705 if (c_dialect_objc () && (TREE_CODE (decl
) == VAR_DECL
4706 || TREE_CODE (decl
) == FUNCTION_DECL
4707 || TREE_CODE (decl
) == FIELD_DECL
))
4708 objc_check_decl (decl
);
4710 type
= TREE_TYPE (decl
);
4712 /* Deduce size of array from initialization, if not already known. */
4713 if (TREE_CODE (type
) == ARRAY_TYPE
4714 && TYPE_DOMAIN (type
) == 0
4715 && TREE_CODE (decl
) != TYPE_DECL
)
4718 = (TREE_STATIC (decl
)
4719 /* Even if pedantic, an external linkage array
4720 may have incomplete type at first. */
4721 ? pedantic
&& !TREE_PUBLIC (decl
)
4722 : !DECL_EXTERNAL (decl
));
4724 = complete_array_type (&TREE_TYPE (decl
), DECL_INITIAL (decl
),
4727 /* Get the completed type made by complete_array_type. */
4728 type
= TREE_TYPE (decl
);
4733 error ("initializer fails to determine size of %q+D", decl
);
4738 error ("array size missing in %q+D", decl
);
4739 /* If a `static' var's size isn't known,
4740 make it extern as well as static, so it does not get
4742 If it is not `static', then do not mark extern;
4743 finish_incomplete_decl will give it a default size
4744 and it will get allocated. */
4745 else if (!pedantic
&& TREE_STATIC (decl
) && !TREE_PUBLIC (decl
))
4746 DECL_EXTERNAL (decl
) = 1;
4750 error ("zero or negative size array %q+D", decl
);
4754 /* For global variables, update the copy of the type that
4755 exists in the binding. */
4756 if (TREE_PUBLIC (decl
))
4758 struct c_binding
*b_ext
= I_SYMBOL_BINDING (DECL_NAME (decl
));
4759 while (b_ext
&& !B_IN_EXTERNAL_SCOPE (b_ext
))
4760 b_ext
= b_ext
->shadowed
;
4763 if (b_ext
->u
.type
&& comptypes (b_ext
->u
.type
, type
))
4764 b_ext
->u
.type
= composite_type (b_ext
->u
.type
, type
);
4766 b_ext
->u
.type
= type
;
4775 if (DECL_INITIAL (decl
))
4776 TREE_TYPE (DECL_INITIAL (decl
)) = type
;
4778 relayout_decl (decl
);
4781 if (TREE_CODE (decl
) == VAR_DECL
)
4783 if (init
&& TREE_CODE (init
) == CONSTRUCTOR
)
4784 add_flexible_array_elts_to_size (decl
, init
);
4786 if (DECL_SIZE (decl
) == 0 && TREE_TYPE (decl
) != error_mark_node
4787 && COMPLETE_TYPE_P (TREE_TYPE (decl
)))
4788 layout_decl (decl
, 0);
4790 if (DECL_SIZE (decl
) == 0
4791 /* Don't give an error if we already gave one earlier. */
4792 && TREE_TYPE (decl
) != error_mark_node
4793 && (TREE_STATIC (decl
)
4794 /* A static variable with an incomplete type
4795 is an error if it is initialized.
4796 Also if it is not file scope.
4797 Otherwise, let it through, but if it is not `extern'
4798 then it may cause an error message later. */
4799 ? (DECL_INITIAL (decl
) != 0
4800 || !DECL_FILE_SCOPE_P (decl
))
4801 /* An automatic variable with an incomplete type
4803 : !DECL_EXTERNAL (decl
)))
4805 error ("storage size of %q+D isn%'t known", decl
);
4806 TREE_TYPE (decl
) = error_mark_node
;
4809 if ((DECL_EXTERNAL (decl
) || TREE_STATIC (decl
))
4810 && DECL_SIZE (decl
) != 0)
4812 if (TREE_CODE (DECL_SIZE (decl
)) == INTEGER_CST
)
4813 constant_expression_warning (DECL_SIZE (decl
));
4816 error ("storage size of %q+D isn%'t constant", decl
);
4817 TREE_TYPE (decl
) = error_mark_node
;
4821 if (TREE_USED (type
))
4823 TREE_USED (decl
) = 1;
4824 DECL_READ_P (decl
) = 1;
4828 /* If this is a function and an assembler name is specified, reset DECL_RTL
4829 so we can give it its new name. Also, update builtin_decl if it
4830 was a normal built-in. */
4831 if (TREE_CODE (decl
) == FUNCTION_DECL
&& asmspec
)
4833 if (DECL_BUILT_IN_CLASS (decl
) == BUILT_IN_NORMAL
)
4834 set_builtin_user_assembler_name (decl
, asmspec
);
4835 set_user_assembler_name (decl
, asmspec
);
4838 /* If #pragma weak was used, mark the decl weak now. */
4839 maybe_apply_pragma_weak (decl
);
4841 /* Output the assembler code and/or RTL code for variables and functions,
4842 unless the type is an undefined structure or union.
4843 If not, it will get done when the type is completed. */
4845 if (TREE_CODE (decl
) == VAR_DECL
|| TREE_CODE (decl
) == FUNCTION_DECL
)
4847 /* Determine the ELF visibility. */
4848 if (TREE_PUBLIC (decl
))
4849 c_determine_visibility (decl
);
4851 /* This is a no-op in c-lang.c or something real in objc-act.c. */
4852 if (c_dialect_objc ())
4853 objc_check_decl (decl
);
4857 /* If this is not a static variable, issue a warning.
4858 It doesn't make any sense to give an ASMSPEC for an
4859 ordinary, non-register local variable. Historically,
4860 GCC has accepted -- but ignored -- the ASMSPEC in
4862 if (!DECL_FILE_SCOPE_P (decl
)
4863 && TREE_CODE (decl
) == VAR_DECL
4864 && !C_DECL_REGISTER (decl
)
4865 && !TREE_STATIC (decl
))
4866 warning (0, "ignoring asm-specifier for non-static local "
4867 "variable %q+D", decl
);
4869 set_user_assembler_name (decl
, asmspec
);
4872 if (DECL_FILE_SCOPE_P (decl
))
4874 if (DECL_INITIAL (decl
) == NULL_TREE
4875 || DECL_INITIAL (decl
) == error_mark_node
)
4876 /* Don't output anything
4877 when a tentative file-scope definition is seen.
4878 But at end of compilation, do output code for them. */
4879 DECL_DEFER_OUTPUT (decl
) = 1;
4880 if (asmspec
&& C_DECL_REGISTER (decl
))
4881 DECL_HARD_REGISTER (decl
) = 1;
4882 rest_of_decl_compilation (decl
, true, 0);
4886 /* In conjunction with an ASMSPEC, the `register'
4887 keyword indicates that we should place the variable
4888 in a particular register. */
4889 if (asmspec
&& C_DECL_REGISTER (decl
))
4891 DECL_HARD_REGISTER (decl
) = 1;
4892 /* This cannot be done for a structure with volatile
4893 fields, on which DECL_REGISTER will have been
4895 if (!DECL_REGISTER (decl
))
4896 error ("cannot put object with volatile field into register");
4899 if (TREE_CODE (decl
) != FUNCTION_DECL
)
4901 /* If we're building a variable sized type, and we might be
4902 reachable other than via the top of the current binding
4903 level, then create a new BIND_EXPR so that we deallocate
4904 the object at the right time. */
4905 /* Note that DECL_SIZE can be null due to errors. */
4906 if (DECL_SIZE (decl
)
4907 && !TREE_CONSTANT (DECL_SIZE (decl
))
4908 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list
))
4911 bind
= build3 (BIND_EXPR
, void_type_node
, NULL
, NULL
, NULL
);
4912 TREE_SIDE_EFFECTS (bind
) = 1;
4914 BIND_EXPR_BODY (bind
) = push_stmt_list ();
4916 add_stmt (build_stmt (DECL_SOURCE_LOCATION (decl
),
4922 if (!DECL_FILE_SCOPE_P (decl
))
4924 /* Recompute the RTL of a local array now
4925 if it used to be an incomplete type. */
4927 && !TREE_STATIC (decl
) && !DECL_EXTERNAL (decl
))
4929 /* If we used it already as memory, it must stay in memory. */
4930 TREE_ADDRESSABLE (decl
) = TREE_USED (decl
);
4931 /* If it's still incomplete now, no init will save it. */
4932 if (DECL_SIZE (decl
) == 0)
4933 DECL_INITIAL (decl
) = 0;
4938 if (TREE_CODE (decl
) == TYPE_DECL
)
4940 if (!DECL_FILE_SCOPE_P (decl
)
4941 && variably_modified_type_p (TREE_TYPE (decl
), NULL_TREE
))
4942 add_stmt (build_stmt (DECL_SOURCE_LOCATION (decl
), DECL_EXPR
, decl
));
4944 rest_of_decl_compilation (decl
, DECL_FILE_SCOPE_P (decl
), 0);
4947 /* Install a cleanup (aka destructor) if one was given. */
4948 if (TREE_CODE (decl
) == VAR_DECL
&& !TREE_STATIC (decl
))
4950 tree attr
= lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl
));
4953 tree cleanup_id
= TREE_VALUE (TREE_VALUE (attr
));
4954 tree cleanup_decl
= lookup_name (cleanup_id
);
4956 vec
<tree
, va_gc
> *v
;
4958 /* Build "cleanup(&decl)" for the destructor. */
4959 cleanup
= build_unary_op (input_location
, ADDR_EXPR
, decl
, 0);
4961 v
->quick_push (cleanup
);
4962 cleanup
= c_build_function_call_vec (DECL_SOURCE_LOCATION (decl
),
4963 vNULL
, cleanup_decl
, v
, NULL
);
4966 /* Don't warn about decl unused; the cleanup uses it. */
4967 TREE_USED (decl
) = 1;
4968 TREE_USED (cleanup_decl
) = 1;
4969 DECL_READ_P (decl
) = 1;
4971 push_cleanup (decl
, cleanup
, false);
4976 && TREE_CODE (decl
) == VAR_DECL
4977 && !DECL_EXTERNAL (decl
)
4978 && DECL_INITIAL (decl
) == NULL_TREE
)
4980 type
= strip_array_types (type
);
4981 if (TREE_READONLY (decl
))
4982 warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wc___compat
,
4983 "uninitialized const %qD is invalid in C++", decl
);
4984 else if ((TREE_CODE (type
) == RECORD_TYPE
4985 || TREE_CODE (type
) == UNION_TYPE
)
4986 && C_TYPE_FIELDS_READONLY (type
))
4987 diagnose_uninitialized_cst_member (decl
, type
);
4990 invoke_plugin_callbacks (PLUGIN_FINISH_DECL
, decl
);
4993 /* Given a parsed parameter declaration, decode it into a PARM_DECL.
4994 EXPR is NULL or a pointer to an expression that needs to be
4995 evaluated for the side effects of array size expressions in the
4999 grokparm (const struct c_parm
*parm
, tree
*expr
)
5001 tree attrs
= parm
->attrs
;
5002 tree decl
= grokdeclarator (parm
->declarator
, parm
->specs
, PARM
, false,
5003 NULL
, &attrs
, expr
, NULL
, DEPRECATED_NORMAL
);
5005 decl_attributes (&decl
, attrs
, 0);
5010 /* Given a parsed parameter declaration, decode it into a PARM_DECL
5011 and push that on the current scope. EXPR is a pointer to an
5012 expression that needs to be evaluated for the side effects of array
5013 size expressions in the parameters. */
5016 push_parm_decl (const struct c_parm
*parm
, tree
*expr
)
5018 tree attrs
= parm
->attrs
;
5021 decl
= grokdeclarator (parm
->declarator
, parm
->specs
, PARM
, false, NULL
,
5022 &attrs
, expr
, NULL
, DEPRECATED_NORMAL
);
5023 decl_attributes (&decl
, attrs
, 0);
5025 decl
= pushdecl (decl
);
5027 finish_decl (decl
, input_location
, NULL_TREE
, NULL_TREE
, NULL_TREE
);
5030 /* Mark all the parameter declarations to date as forward decls.
5031 Also diagnose use of this extension. */
5034 mark_forward_parm_decls (void)
5036 struct c_binding
*b
;
5038 if (pedantic
&& !current_scope
->warned_forward_parm_decls
)
5040 pedwarn (input_location
, OPT_Wpedantic
,
5041 "ISO C forbids forward parameter declarations");
5042 current_scope
->warned_forward_parm_decls
= true;
5045 for (b
= current_scope
->bindings
; b
; b
= b
->prev
)
5046 if (TREE_CODE (b
->decl
) == PARM_DECL
)
5047 TREE_ASM_WRITTEN (b
->decl
) = 1;
5050 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
5051 literal, which may be an incomplete array type completed by the
5052 initializer; INIT is a CONSTRUCTOR at LOC that initializes the compound
5053 literal. NON_CONST is true if the initializers contain something
5054 that cannot occur in a constant expression. */
5057 build_compound_literal (location_t loc
, tree type
, tree init
, bool non_const
)
5059 /* We do not use start_decl here because we have a type, not a declarator;
5060 and do not use finish_decl because the decl should be stored inside
5061 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_EXPR. */
5066 if (type
== error_mark_node
5067 || init
== error_mark_node
)
5068 return error_mark_node
;
5070 decl
= build_decl (loc
, VAR_DECL
, NULL_TREE
, type
);
5071 DECL_EXTERNAL (decl
) = 0;
5072 TREE_PUBLIC (decl
) = 0;
5073 TREE_STATIC (decl
) = (current_scope
== file_scope
);
5074 DECL_CONTEXT (decl
) = current_function_decl
;
5075 TREE_USED (decl
) = 1;
5076 DECL_READ_P (decl
) = 1;
5077 TREE_TYPE (decl
) = type
;
5078 TREE_READONLY (decl
) = (TYPE_READONLY (type
)
5079 || (TREE_CODE (type
) == ARRAY_TYPE
5080 && TYPE_READONLY (TREE_TYPE (type
))));
5081 store_init_value (loc
, decl
, init
, NULL_TREE
);
5083 if (TREE_CODE (type
) == ARRAY_TYPE
&& !COMPLETE_TYPE_P (type
))
5085 int failure
= complete_array_type (&TREE_TYPE (decl
),
5086 DECL_INITIAL (decl
), true);
5087 /* If complete_array_type returns 3, it means that the
5088 initial value of the compound literal is empty. Allow it. */
5089 gcc_assert (failure
== 0 || failure
== 3);
5091 type
= TREE_TYPE (decl
);
5092 TREE_TYPE (DECL_INITIAL (decl
)) = type
;
5095 if (type
== error_mark_node
|| !COMPLETE_TYPE_P (type
))
5097 c_incomplete_type_error (NULL_TREE
, type
);
5098 return error_mark_node
;
5101 stmt
= build_stmt (DECL_SOURCE_LOCATION (decl
), DECL_EXPR
, decl
);
5102 complit
= build1 (COMPOUND_LITERAL_EXPR
, type
, stmt
);
5103 TREE_SIDE_EFFECTS (complit
) = 1;
5105 layout_decl (decl
, 0);
5107 if (TREE_STATIC (decl
))
5109 /* This decl needs a name for the assembler output. */
5110 set_compound_literal_name (decl
);
5111 DECL_DEFER_OUTPUT (decl
) = 1;
5112 DECL_COMDAT (decl
) = 1;
5113 DECL_ARTIFICIAL (decl
) = 1;
5114 DECL_IGNORED_P (decl
) = 1;
5116 rest_of_decl_compilation (decl
, 1, 0);
5121 complit
= build2 (C_MAYBE_CONST_EXPR
, type
, NULL
, complit
);
5122 C_MAYBE_CONST_EXPR_NON_CONST (complit
) = 1;
5128 /* Check the type of a compound literal. Here we just check that it
5129 is valid for C++. */
5132 check_compound_literal_type (location_t loc
, struct c_type_name
*type_name
)
5135 && (type_name
->specs
->typespec_kind
== ctsk_tagdef
5136 || type_name
->specs
->typespec_kind
== ctsk_tagfirstref
))
5137 warning_at (loc
, OPT_Wc___compat
,
5138 "defining a type in a compound literal is invalid in C++");
5141 /* Determine whether TYPE is a structure with a flexible array member,
5142 or a union containing such a structure (possibly recursively). */
5145 flexible_array_type_p (tree type
)
5148 switch (TREE_CODE (type
))
5151 x
= TYPE_FIELDS (type
);
5154 while (DECL_CHAIN (x
) != NULL_TREE
)
5156 if (TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
5157 && TYPE_SIZE (TREE_TYPE (x
)) == NULL_TREE
5158 && TYPE_DOMAIN (TREE_TYPE (x
)) != NULL_TREE
5159 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x
))) == NULL_TREE
)
5163 for (x
= TYPE_FIELDS (type
); x
!= NULL_TREE
; x
= DECL_CHAIN (x
))
5165 if (flexible_array_type_p (TREE_TYPE (x
)))
5174 /* Performs sanity checks on the TYPE and WIDTH of the bit-field NAME,
5175 replacing with appropriate values if they are invalid. */
5177 check_bitfield_type_and_width (tree
*type
, tree
*width
, tree orig_name
)
5180 unsigned int max_width
;
5181 unsigned HOST_WIDE_INT w
;
5182 const char *name
= (orig_name
5183 ? identifier_to_locale (IDENTIFIER_POINTER (orig_name
))
5184 : _("<anonymous>"));
5186 /* Detect and ignore out of range field width and process valid
5188 if (!INTEGRAL_TYPE_P (TREE_TYPE (*width
)))
5190 error ("bit-field %qs width not an integer constant", name
);
5191 *width
= integer_one_node
;
5195 if (TREE_CODE (*width
) != INTEGER_CST
)
5197 *width
= c_fully_fold (*width
, false, NULL
);
5198 if (TREE_CODE (*width
) == INTEGER_CST
)
5199 pedwarn (input_location
, OPT_Wpedantic
,
5200 "bit-field %qs width not an integer constant expression",
5203 if (TREE_CODE (*width
) != INTEGER_CST
)
5205 error ("bit-field %qs width not an integer constant", name
);
5206 *width
= integer_one_node
;
5208 constant_expression_warning (*width
);
5209 if (tree_int_cst_sgn (*width
) < 0)
5211 error ("negative width in bit-field %qs", name
);
5212 *width
= integer_one_node
;
5214 else if (integer_zerop (*width
) && orig_name
)
5216 error ("zero width for bit-field %qs", name
);
5217 *width
= integer_one_node
;
5221 /* Detect invalid bit-field type. */
5222 if (TREE_CODE (*type
) != INTEGER_TYPE
5223 && TREE_CODE (*type
) != BOOLEAN_TYPE
5224 && TREE_CODE (*type
) != ENUMERAL_TYPE
)
5226 error ("bit-field %qs has invalid type", name
);
5227 *type
= unsigned_type_node
;
5230 type_mv
= TYPE_MAIN_VARIANT (*type
);
5231 if (!in_system_header_at (input_location
)
5232 && type_mv
!= integer_type_node
5233 && type_mv
!= unsigned_type_node
5234 && type_mv
!= boolean_type_node
)
5235 pedwarn_c90 (input_location
, OPT_Wpedantic
,
5236 "type of bit-field %qs is a GCC extension", name
);
5238 max_width
= TYPE_PRECISION (*type
);
5240 if (0 < compare_tree_int (*width
, max_width
))
5242 error ("width of %qs exceeds its type", name
);
5244 *width
= build_int_cst (integer_type_node
, w
);
5247 w
= tree_to_uhwi (*width
);
5249 if (TREE_CODE (*type
) == ENUMERAL_TYPE
)
5251 struct lang_type
*lt
= TYPE_LANG_SPECIFIC (*type
);
5253 || w
< tree_int_cst_min_precision (lt
->enum_min
, TYPE_SIGN (*type
))
5254 || w
< tree_int_cst_min_precision (lt
->enum_max
, TYPE_SIGN (*type
)))
5255 warning (0, "%qs is narrower than values of its type", name
);
5261 /* Print warning about variable length array if necessary. */
5264 warn_variable_length_array (tree name
, tree size
)
5266 if (TREE_CONSTANT (size
))
5269 pedwarn_c90 (input_location
, OPT_Wvla
,
5270 "ISO C90 forbids array %qE whose size "
5271 "can%'t be evaluated", name
);
5273 pedwarn_c90 (input_location
, OPT_Wvla
, "ISO C90 forbids array "
5274 "whose size can%'t be evaluated");
5279 pedwarn_c90 (input_location
, OPT_Wvla
,
5280 "ISO C90 forbids variable length array %qE", name
);
5282 pedwarn_c90 (input_location
, OPT_Wvla
, "ISO C90 forbids variable "
5287 /* Print warning about defaulting to int if necessary. */
5290 warn_defaults_to (location_t location
, int opt
, const char *gmsgid
, ...)
5292 diagnostic_info diagnostic
;
5295 va_start (ap
, gmsgid
);
5296 diagnostic_set_info (&diagnostic
, gmsgid
, &ap
, location
,
5297 flag_isoc99
? DK_PEDWARN
: DK_WARNING
);
5298 diagnostic
.option_index
= opt
;
5299 report_diagnostic (&diagnostic
);
5303 /* Given declspecs and a declarator,
5304 determine the name and type of the object declared
5305 and construct a ..._DECL node for it.
5306 (In one case we can return a ..._TYPE node instead.
5307 For invalid input we sometimes return 0.)
5309 DECLSPECS is a c_declspecs structure for the declaration specifiers.
5311 DECL_CONTEXT says which syntactic context this declaration is in:
5312 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
5313 FUNCDEF for a function definition. Like NORMAL but a few different
5314 error messages in each case. Return value may be zero meaning
5315 this definition is too screwy to try to parse.
5316 PARM for a parameter declaration (either within a function prototype
5317 or before a function body). Make a PARM_DECL, or return void_type_node.
5318 TYPENAME if for a typename (in a cast or sizeof).
5319 Don't make a DECL node; just return the ..._TYPE node.
5320 FIELD for a struct or union field; make a FIELD_DECL.
5321 INITIALIZED is true if the decl has an initializer.
5322 WIDTH is non-NULL for bit-fields, and is a pointer to an INTEGER_CST node
5323 representing the width of the bit-field.
5324 DECL_ATTRS points to the list of attributes that should be added to this
5325 decl. Any nested attributes that belong on the decl itself will be
5327 If EXPR is not NULL, any expressions that need to be evaluated as
5328 part of evaluating variably modified types will be stored in *EXPR.
5329 If EXPR_CONST_OPERANDS is not NULL, *EXPR_CONST_OPERANDS will be
5330 set to indicate whether operands in *EXPR can be used in constant
5332 DEPRECATED_STATE is a deprecated_states value indicating whether
5333 deprecation warnings should be suppressed.
5335 In the TYPENAME case, DECLARATOR is really an absolute declarator.
5336 It may also be so in the PARM case, for a prototype where the
5337 argument type is specified but not the name.
5339 This function is where the complicated C meanings of `static'
5340 and `extern' are interpreted. */
5343 grokdeclarator (const struct c_declarator
*declarator
,
5344 struct c_declspecs
*declspecs
,
5345 enum decl_context decl_context
, bool initialized
, tree
*width
,
5346 tree
*decl_attrs
, tree
*expr
, bool *expr_const_operands
,
5347 enum deprecated_states deprecated_state
)
5349 tree type
= declspecs
->type
;
5350 bool threadp
= declspecs
->thread_p
;
5351 enum c_storage_class storage_class
= declspecs
->storage_class
;
5356 int type_quals
= TYPE_UNQUALIFIED
;
5357 tree name
= NULL_TREE
;
5358 bool funcdef_flag
= false;
5359 bool funcdef_syntax
= false;
5360 bool size_varies
= false;
5361 tree decl_attr
= declspecs
->decl_attr
;
5362 int array_ptr_quals
= TYPE_UNQUALIFIED
;
5363 tree array_ptr_attrs
= NULL_TREE
;
5364 int array_parm_static
= 0;
5365 bool array_parm_vla_unspec_p
= false;
5366 tree returned_attrs
= NULL_TREE
;
5367 bool bitfield
= width
!= NULL
;
5369 struct c_arg_info
*arg_info
= 0;
5370 addr_space_t as1
, as2
, address_space
;
5371 location_t loc
= UNKNOWN_LOCATION
;
5374 bool expr_const_operands_dummy
;
5375 enum c_declarator_kind first_non_attr_kind
;
5376 unsigned int alignas_align
= 0;
5378 if (TREE_CODE (type
) == ERROR_MARK
)
5379 return error_mark_node
;
5382 if (expr_const_operands
== NULL
)
5383 expr_const_operands
= &expr_const_operands_dummy
;
5385 *expr
= declspecs
->expr
;
5386 *expr_const_operands
= declspecs
->expr_const_operands
;
5388 if (decl_context
== FUNCDEF
)
5389 funcdef_flag
= true, decl_context
= NORMAL
;
5391 /* Look inside a declarator for the name being declared
5392 and get it as an IDENTIFIER_NODE, for an error message. */
5394 const struct c_declarator
*decl
= declarator
;
5396 first_non_attr_kind
= cdk_attrs
;
5406 funcdef_syntax
= (decl
->kind
== cdk_function
);
5407 decl
= decl
->declarator
;
5408 if (first_non_attr_kind
== cdk_attrs
)
5409 first_non_attr_kind
= decl
->kind
;
5413 decl
= decl
->declarator
;
5420 if (first_non_attr_kind
== cdk_attrs
)
5421 first_non_attr_kind
= decl
->kind
;
5430 gcc_assert (decl_context
== PARM
5431 || decl_context
== TYPENAME
5432 || (decl_context
== FIELD
5433 && declarator
->kind
== cdk_id
));
5434 gcc_assert (!initialized
);
5438 /* A function definition's declarator must have the form of
5439 a function declarator. */
5441 if (funcdef_flag
&& !funcdef_syntax
)
5444 /* If this looks like a function definition, make it one,
5445 even if it occurs where parms are expected.
5446 Then store_parm_decls will reject it and not use it as a parm. */
5447 if (decl_context
== NORMAL
&& !funcdef_flag
&& current_scope
->parm_flag
)
5448 decl_context
= PARM
;
5450 if (declspecs
->deprecated_p
&& deprecated_state
!= DEPRECATED_SUPPRESS
)
5451 warn_deprecated_use (declspecs
->type
, declspecs
->decl_attr
);
5453 if ((decl_context
== NORMAL
|| decl_context
== FIELD
)
5454 && current_scope
== file_scope
5455 && variably_modified_type_p (type
, NULL_TREE
))
5458 error_at (loc
, "variably modified %qE at file scope", name
);
5460 error_at (loc
, "variably modified field at file scope");
5461 type
= integer_type_node
;
5464 size_varies
= C_TYPE_VARIABLE_SIZE (type
) != 0;
5466 /* Diagnose defaulting to "int". */
5468 if (declspecs
->default_int_p
&& !in_system_header_at (input_location
))
5470 /* Issue a warning if this is an ISO C 99 program or if
5471 -Wreturn-type and this is a function, or if -Wimplicit;
5472 prefer the former warning since it is more explicit. */
5473 if ((warn_implicit_int
|| warn_return_type
|| flag_isoc99
)
5475 warn_about_return_type
= 1;
5479 warn_defaults_to (loc
, OPT_Wimplicit_int
,
5480 "type defaults to %<int%> in declaration "
5483 warn_defaults_to (loc
, OPT_Wimplicit_int
,
5484 "type defaults to %<int%> in type name");
5488 /* Adjust the type if a bit-field is being declared,
5489 -funsigned-bitfields applied and the type is not explicitly
5491 if (bitfield
&& !flag_signed_bitfields
&& !declspecs
->explicit_signed_p
5492 && TREE_CODE (type
) == INTEGER_TYPE
)
5493 type
= unsigned_type_for (type
);
5495 /* Figure out the type qualifiers for the declaration. There are
5496 two ways a declaration can become qualified. One is something
5497 like `const int i' where the `const' is explicit. Another is
5498 something like `typedef const int CI; CI i' where the type of the
5499 declaration contains the `const'. A third possibility is that
5500 there is a type qualifier on the element type of a typedefed
5501 array type, in which case we should extract that qualifier so
5502 that c_apply_type_quals_to_decl receives the full list of
5503 qualifiers to work with (C90 is not entirely clear about whether
5504 duplicate qualifiers should be diagnosed in this case, but it
5505 seems most appropriate to do so). */
5506 element_type
= strip_array_types (type
);
5507 constp
= declspecs
->const_p
+ TYPE_READONLY (element_type
);
5508 restrictp
= declspecs
->restrict_p
+ TYPE_RESTRICT (element_type
);
5509 volatilep
= declspecs
->volatile_p
+ TYPE_VOLATILE (element_type
);
5510 atomicp
= declspecs
->atomic_p
+ TYPE_ATOMIC (element_type
);
5511 as1
= declspecs
->address_space
;
5512 as2
= TYPE_ADDR_SPACE (element_type
);
5513 address_space
= ADDR_SPACE_GENERIC_P (as1
)? as2
: as1
;
5516 pedwarn_c90 (loc
, OPT_Wpedantic
, "duplicate %<const%>");
5518 pedwarn_c90 (loc
, OPT_Wpedantic
, "duplicate %<restrict%>");
5520 pedwarn_c90 (loc
, OPT_Wpedantic
, "duplicate %<volatile%>");
5522 pedwarn_c90 (loc
, OPT_Wpedantic
, "duplicate %<_Atomic%>");
5524 if (!ADDR_SPACE_GENERIC_P (as1
) && !ADDR_SPACE_GENERIC_P (as2
) && as1
!= as2
)
5525 error_at (loc
, "conflicting named address spaces (%s vs %s)",
5526 c_addr_space_name (as1
), c_addr_space_name (as2
));
5528 if ((TREE_CODE (type
) == ARRAY_TYPE
5529 || first_non_attr_kind
== cdk_array
)
5530 && TYPE_QUALS (element_type
))
5531 type
= TYPE_MAIN_VARIANT (type
);
5532 type_quals
= ((constp
? TYPE_QUAL_CONST
: 0)
5533 | (restrictp
? TYPE_QUAL_RESTRICT
: 0)
5534 | (volatilep
? TYPE_QUAL_VOLATILE
: 0)
5535 | (atomicp
? TYPE_QUAL_ATOMIC
: 0)
5536 | ENCODE_QUAL_ADDR_SPACE (address_space
));
5538 /* Applying the _Atomic qualifier to an array type (through the use
5539 of typedefs or typeof) must be detected here. If the qualifier
5540 is introduced later, any appearance of applying it to an array is
5541 actually applying it to an element of that array. */
5542 if (atomicp
&& TREE_CODE (type
) == ARRAY_TYPE
)
5543 error_at (loc
, "%<_Atomic%>-qualified array type");
5545 /* Warn about storage classes that are invalid for certain
5546 kinds of declarations (parameters, typenames, etc.). */
5550 || storage_class
== csc_auto
5551 || storage_class
== csc_register
5552 || storage_class
== csc_typedef
))
5554 if (storage_class
== csc_auto
)
5556 (current_scope
== file_scope
) ? 0 : OPT_Wpedantic
,
5557 "function definition declared %<auto%>");
5558 if (storage_class
== csc_register
)
5559 error_at (loc
, "function definition declared %<register%>");
5560 if (storage_class
== csc_typedef
)
5561 error_at (loc
, "function definition declared %<typedef%>");
5563 error_at (loc
, "function definition declared %qs",
5564 declspecs
->thread_gnu_p
? "__thread" : "_Thread_local");
5566 if (storage_class
== csc_auto
5567 || storage_class
== csc_register
5568 || storage_class
== csc_typedef
)
5569 storage_class
= csc_none
;
5571 else if (decl_context
!= NORMAL
&& (storage_class
!= csc_none
|| threadp
))
5573 if (decl_context
== PARM
&& storage_class
== csc_register
)
5577 switch (decl_context
)
5581 error_at (loc
, "storage class specified for structure "
5584 error_at (loc
, "storage class specified for structure field");
5588 error_at (loc
, "storage class specified for parameter %qE",
5591 error_at (loc
, "storage class specified for unnamed parameter");
5594 error_at (loc
, "storage class specified for typename");
5597 storage_class
= csc_none
;
5601 else if (storage_class
== csc_extern
5605 /* 'extern' with initialization is invalid if not at file scope. */
5606 if (current_scope
== file_scope
)
5608 /* It is fine to have 'extern const' when compiling at C
5609 and C++ intersection. */
5610 if (!(warn_cxx_compat
&& constp
))
5611 warning_at (loc
, 0, "%qE initialized and declared %<extern%>",
5615 error_at (loc
, "%qE has both %<extern%> and initializer", name
);
5617 else if (current_scope
== file_scope
)
5619 if (storage_class
== csc_auto
)
5620 error_at (loc
, "file-scope declaration of %qE specifies %<auto%>",
5622 if (pedantic
&& storage_class
== csc_register
)
5623 pedwarn (input_location
, OPT_Wpedantic
,
5624 "file-scope declaration of %qE specifies %<register%>", name
);
5628 if (storage_class
== csc_extern
&& funcdef_flag
)
5629 error_at (loc
, "nested function %qE declared %<extern%>", name
);
5630 else if (threadp
&& storage_class
== csc_none
)
5632 error_at (loc
, "function-scope %qE implicitly auto and declared "
5634 declspecs
->thread_gnu_p
? "__thread" : "_Thread_local");
5639 /* Now figure out the structure of the declarator proper.
5640 Descend through it, creating more complex types, until we reach
5641 the declared identifier (or NULL_TREE, in an absolute declarator).
5642 At each stage we maintain an unqualified version of the type
5643 together with any qualifiers that should be applied to it with
5644 c_build_qualified_type; this way, array types including
5645 multidimensional array types are first built up in unqualified
5646 form and then the qualified form is created with
5647 TYPE_MAIN_VARIANT pointing to the unqualified form. */
5649 while (declarator
&& declarator
->kind
!= cdk_id
)
5651 if (type
== error_mark_node
)
5653 declarator
= declarator
->declarator
;
5657 /* Each level of DECLARATOR is either a cdk_array (for ...[..]),
5658 a cdk_pointer (for *...),
5659 a cdk_function (for ...(...)),
5660 a cdk_attrs (for nested attributes),
5661 or a cdk_id (for the name being declared
5662 or the place in an absolute declarator
5663 where the name was omitted).
5664 For the last case, we have just exited the loop.
5666 At this point, TYPE is the type of elements of an array,
5667 or for a function to return, or for a pointer to point to.
5668 After this sequence of ifs, TYPE is the type of the
5669 array or function or pointer, and DECLARATOR has had its
5670 outermost layer removed. */
5672 if (array_ptr_quals
!= TYPE_UNQUALIFIED
5673 || array_ptr_attrs
!= NULL_TREE
5674 || array_parm_static
)
5676 /* Only the innermost declarator (making a parameter be of
5677 array type which is converted to pointer type)
5678 may have static or type qualifiers. */
5679 error_at (loc
, "static or type qualifiers in non-parameter array declarator");
5680 array_ptr_quals
= TYPE_UNQUALIFIED
;
5681 array_ptr_attrs
= NULL_TREE
;
5682 array_parm_static
= 0;
5685 switch (declarator
->kind
)
5689 /* A declarator with embedded attributes. */
5690 tree attrs
= declarator
->u
.attrs
;
5691 const struct c_declarator
*inner_decl
;
5693 declarator
= declarator
->declarator
;
5694 inner_decl
= declarator
;
5695 while (inner_decl
->kind
== cdk_attrs
)
5696 inner_decl
= inner_decl
->declarator
;
5697 if (inner_decl
->kind
== cdk_id
)
5698 attr_flags
|= (int) ATTR_FLAG_DECL_NEXT
;
5699 else if (inner_decl
->kind
== cdk_function
)
5700 attr_flags
|= (int) ATTR_FLAG_FUNCTION_NEXT
;
5701 else if (inner_decl
->kind
== cdk_array
)
5702 attr_flags
|= (int) ATTR_FLAG_ARRAY_NEXT
;
5703 returned_attrs
= decl_attributes (&type
,
5704 chainon (returned_attrs
, attrs
),
5710 tree itype
= NULL_TREE
;
5711 tree size
= declarator
->u
.array
.dimen
;
5712 /* The index is a signed object `sizetype' bits wide. */
5713 tree index_type
= c_common_signed_type (sizetype
);
5715 array_ptr_quals
= declarator
->u
.array
.quals
;
5716 array_ptr_attrs
= declarator
->u
.array
.attrs
;
5717 array_parm_static
= declarator
->u
.array
.static_p
;
5718 array_parm_vla_unspec_p
= declarator
->u
.array
.vla_unspec_p
;
5720 declarator
= declarator
->declarator
;
5722 /* Check for some types that there cannot be arrays of. */
5724 if (VOID_TYPE_P (type
))
5727 error_at (loc
, "declaration of %qE as array of voids", name
);
5729 error_at (loc
, "declaration of type name as array of voids");
5730 type
= error_mark_node
;
5733 if (TREE_CODE (type
) == FUNCTION_TYPE
)
5736 error_at (loc
, "declaration of %qE as array of functions",
5739 error_at (loc
, "declaration of type name as array of "
5741 type
= error_mark_node
;
5744 if (pedantic
&& !in_system_header_at (input_location
)
5745 && flexible_array_type_p (type
))
5746 pedwarn (loc
, OPT_Wpedantic
,
5747 "invalid use of structure with flexible array member");
5749 if (size
== error_mark_node
)
5750 type
= error_mark_node
;
5752 if (type
== error_mark_node
)
5755 /* If size was specified, set ITYPE to a range-type for
5756 that size. Otherwise, ITYPE remains null. finish_decl
5757 may figure it out from an initial value. */
5761 bool size_maybe_const
= true;
5762 bool size_int_const
= (TREE_CODE (size
) == INTEGER_CST
5763 && !TREE_OVERFLOW (size
));
5764 bool this_size_varies
= false;
5766 /* Strip NON_LVALUE_EXPRs since we aren't using as an
5768 STRIP_TYPE_NOPS (size
);
5770 if (!INTEGRAL_TYPE_P (TREE_TYPE (size
)))
5773 error_at (loc
, "size of array %qE has non-integer type",
5777 "size of unnamed array has non-integer type");
5778 size
= integer_one_node
;
5781 size
= c_fully_fold (size
, false, &size_maybe_const
);
5783 if (pedantic
&& size_maybe_const
&& integer_zerop (size
))
5786 pedwarn (loc
, OPT_Wpedantic
,
5787 "ISO C forbids zero-size array %qE", name
);
5789 pedwarn (loc
, OPT_Wpedantic
,
5790 "ISO C forbids zero-size array");
5793 if (TREE_CODE (size
) == INTEGER_CST
&& size_maybe_const
)
5795 constant_expression_warning (size
);
5796 if (tree_int_cst_sgn (size
) < 0)
5799 error_at (loc
, "size of array %qE is negative", name
);
5801 error_at (loc
, "size of unnamed array is negative");
5802 size
= integer_one_node
;
5804 /* Handle a size folded to an integer constant but
5805 not an integer constant expression. */
5806 if (!size_int_const
)
5808 /* If this is a file scope declaration of an
5809 ordinary identifier, this is invalid code;
5810 diagnosing it here and not subsequently
5811 treating the type as variable-length avoids
5812 more confusing diagnostics later. */
5813 if ((decl_context
== NORMAL
|| decl_context
== FIELD
)
5814 && current_scope
== file_scope
)
5815 pedwarn (input_location
, 0,
5816 "variably modified %qE at file scope",
5819 this_size_varies
= size_varies
= true;
5820 warn_variable_length_array (name
, size
);
5823 else if ((decl_context
== NORMAL
|| decl_context
== FIELD
)
5824 && current_scope
== file_scope
)
5826 error_at (loc
, "variably modified %qE at file scope", name
);
5827 size
= integer_one_node
;
5831 /* Make sure the array size remains visibly
5832 nonconstant even if it is (eg) a const variable
5833 with known value. */
5834 this_size_varies
= size_varies
= true;
5835 warn_variable_length_array (name
, size
);
5836 if (flag_sanitize
& SANITIZE_VLA
5837 && decl_context
== NORMAL
5838 && current_function_decl
!= NULL_TREE
5839 && !lookup_attribute ("no_sanitize_undefined",
5841 (current_function_decl
)))
5843 /* Evaluate the array size only once. */
5844 size
= c_save_expr (size
);
5845 size
= c_fully_fold (size
, false, NULL
);
5846 size
= fold_build2 (COMPOUND_EXPR
, TREE_TYPE (size
),
5847 ubsan_instrument_vla (loc
, size
),
5852 if (integer_zerop (size
) && !this_size_varies
)
5854 /* A zero-length array cannot be represented with
5855 an unsigned index type, which is what we'll
5856 get with build_index_type. Create an
5857 open-ended range instead. */
5858 itype
= build_range_type (sizetype
, size
, NULL_TREE
);
5862 /* Arrange for the SAVE_EXPR on the inside of the
5863 MINUS_EXPR, which allows the -1 to get folded
5864 with the +1 that happens when building TYPE_SIZE. */
5866 size
= save_expr (size
);
5867 if (this_size_varies
&& TREE_CODE (size
) == INTEGER_CST
)
5868 size
= build2 (COMPOUND_EXPR
, TREE_TYPE (size
),
5869 integer_zero_node
, size
);
5871 /* Compute the maximum valid index, that is, size
5872 - 1. Do the calculation in index_type, so that
5873 if it is a variable the computations will be
5874 done in the proper mode. */
5875 itype
= fold_build2_loc (loc
, MINUS_EXPR
, index_type
,
5876 convert (index_type
, size
),
5877 convert (index_type
,
5880 /* The above overflows when size does not fit
5882 ??? While a size of INT_MAX+1 technically shouldn't
5883 cause an overflow (because we subtract 1), handling
5884 this case seems like an unnecessary complication. */
5885 if (TREE_CODE (size
) == INTEGER_CST
5886 && !int_fits_type_p (size
, index_type
))
5889 error_at (loc
, "size of array %qE is too large",
5892 error_at (loc
, "size of unnamed array is too large");
5893 type
= error_mark_node
;
5897 itype
= build_index_type (itype
);
5899 if (this_size_varies
)
5902 *expr
= build2 (COMPOUND_EXPR
, TREE_TYPE (size
),
5906 *expr_const_operands
&= size_maybe_const
;
5909 else if (decl_context
== FIELD
)
5911 bool flexible_array_member
= false;
5912 if (array_parm_vla_unspec_p
)
5913 /* Field names can in fact have function prototype
5914 scope so [*] is disallowed here through making
5915 the field variably modified, not through being
5916 something other than a declaration with function
5921 const struct c_declarator
*t
= declarator
;
5922 while (t
->kind
== cdk_attrs
)
5924 flexible_array_member
= (t
->kind
== cdk_id
);
5926 if (flexible_array_member
5927 && !in_system_header_at (input_location
))
5928 pedwarn_c90 (loc
, OPT_Wpedantic
, "ISO C90 does not "
5929 "support flexible array members");
5931 /* ISO C99 Flexible array members are effectively
5932 identical to GCC's zero-length array extension. */
5933 if (flexible_array_member
|| array_parm_vla_unspec_p
)
5934 itype
= build_range_type (sizetype
, size_zero_node
,
5937 else if (decl_context
== PARM
)
5939 if (array_parm_vla_unspec_p
)
5941 itype
= build_range_type (sizetype
, size_zero_node
, NULL_TREE
);
5945 else if (decl_context
== TYPENAME
)
5947 if (array_parm_vla_unspec_p
)
5950 warning (0, "%<[*]%> not in a declaration");
5951 /* We use this to avoid messing up with incomplete
5952 array types of the same type, that would
5953 otherwise be modified below. */
5954 itype
= build_range_type (sizetype
, size_zero_node
,
5960 /* Complain about arrays of incomplete types. */
5961 if (!COMPLETE_TYPE_P (type
))
5963 error_at (loc
, "array type has incomplete element type");
5964 type
= error_mark_node
;
5967 /* When itype is NULL, a shared incomplete array type is
5968 returned for all array of a given type. Elsewhere we
5969 make sure we don't complete that type before copying
5970 it, but here we want to make sure we don't ever
5971 modify the shared type, so we gcc_assert (itype)
5974 addr_space_t as
= DECODE_QUAL_ADDR_SPACE (type_quals
);
5975 if (!ADDR_SPACE_GENERIC_P (as
) && as
!= TYPE_ADDR_SPACE (type
))
5976 type
= build_qualified_type (type
,
5977 ENCODE_QUAL_ADDR_SPACE (as
));
5979 type
= build_array_type (type
, itype
);
5982 if (type
!= error_mark_node
)
5986 /* It is ok to modify type here even if itype is
5987 NULL: if size_varies, we're in a
5988 multi-dimensional array and the inner type has
5989 variable size, so the enclosing shared array type
5991 if (size
&& TREE_CODE (size
) == INTEGER_CST
)
5993 = build_distinct_type_copy (TYPE_MAIN_VARIANT (type
));
5994 C_TYPE_VARIABLE_SIZE (type
) = 1;
5997 /* The GCC extension for zero-length arrays differs from
5998 ISO flexible array members in that sizeof yields
6000 if (size
&& integer_zerop (size
))
6003 type
= build_distinct_type_copy (TYPE_MAIN_VARIANT (type
));
6004 TYPE_SIZE (type
) = bitsize_zero_node
;
6005 TYPE_SIZE_UNIT (type
) = size_zero_node
;
6006 SET_TYPE_STRUCTURAL_EQUALITY (type
);
6008 if (array_parm_vla_unspec_p
)
6011 /* The type is complete. C99 6.7.5.2p4 */
6012 type
= build_distinct_type_copy (TYPE_MAIN_VARIANT (type
));
6013 TYPE_SIZE (type
) = bitsize_zero_node
;
6014 TYPE_SIZE_UNIT (type
) = size_zero_node
;
6015 SET_TYPE_STRUCTURAL_EQUALITY (type
);
6019 if (decl_context
!= PARM
6020 && (array_ptr_quals
!= TYPE_UNQUALIFIED
6021 || array_ptr_attrs
!= NULL_TREE
6022 || array_parm_static
))
6024 error_at (loc
, "static or type qualifiers in non-parameter array declarator");
6025 array_ptr_quals
= TYPE_UNQUALIFIED
;
6026 array_ptr_attrs
= NULL_TREE
;
6027 array_parm_static
= 0;
6033 /* Say it's a definition only for the declarator closest
6034 to the identifier, apart possibly from some
6036 bool really_funcdef
= false;
6040 const struct c_declarator
*t
= declarator
->declarator
;
6041 while (t
->kind
== cdk_attrs
)
6043 really_funcdef
= (t
->kind
== cdk_id
);
6046 /* Declaring a function type. Make sure we have a valid
6047 type for the function to return. */
6048 if (type
== error_mark_node
)
6051 size_varies
= false;
6053 /* Warn about some types functions can't return. */
6054 if (TREE_CODE (type
) == FUNCTION_TYPE
)
6057 error_at (loc
, "%qE declared as function returning a "
6060 error_at (loc
, "type name declared as function "
6061 "returning a function");
6062 type
= integer_type_node
;
6064 if (TREE_CODE (type
) == ARRAY_TYPE
)
6067 error_at (loc
, "%qE declared as function returning an array",
6070 error_at (loc
, "type name declared as function returning "
6072 type
= integer_type_node
;
6074 errmsg
= targetm
.invalid_return_type (type
);
6078 type
= integer_type_node
;
6081 /* Construct the function type and go to the next
6082 inner layer of declarator. */
6083 arg_info
= declarator
->u
.arg_info
;
6084 arg_types
= grokparms (arg_info
, really_funcdef
);
6086 /* Type qualifiers before the return type of the function
6087 qualify the return type, not the function type. */
6090 /* Type qualifiers on a function return type are
6091 normally permitted by the standard but have no
6092 effect, so give a warning at -Wreturn-type.
6093 Qualifiers on a void return type are banned on
6094 function definitions in ISO C; GCC used to used
6095 them for noreturn functions. */
6096 if (VOID_TYPE_P (type
) && really_funcdef
)
6098 "function definition has qualified void return type");
6100 warning_at (loc
, OPT_Wignored_qualifiers
,
6101 "type qualifiers ignored on function return type");
6103 type
= c_build_qualified_type (type
, type_quals
);
6105 type_quals
= TYPE_UNQUALIFIED
;
6107 type
= build_function_type (type
, arg_types
);
6108 declarator
= declarator
->declarator
;
6110 /* Set the TYPE_CONTEXTs for each tagged type which is local to
6111 the formal parameter list of this FUNCTION_TYPE to point to
6112 the FUNCTION_TYPE node itself. */
6117 FOR_EACH_VEC_SAFE_ELT_REVERSE (arg_info
->tags
, ix
, tag
)
6118 TYPE_CONTEXT (tag
->type
) = type
;
6124 /* Merge any constancy or volatility into the target type
6126 if ((type_quals
& TYPE_QUAL_ATOMIC
)
6127 && TREE_CODE (type
) == FUNCTION_TYPE
)
6130 "%<_Atomic%>-qualified function type");
6131 type_quals
&= ~TYPE_QUAL_ATOMIC
;
6133 else if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
6135 pedwarn (loc
, OPT_Wpedantic
,
6136 "ISO C forbids qualified function types");
6138 type
= c_build_qualified_type (type
, type_quals
);
6139 size_varies
= false;
6141 /* When the pointed-to type involves components of variable size,
6142 care must be taken to ensure that the size evaluation code is
6143 emitted early enough to dominate all the possible later uses
6144 and late enough for the variables on which it depends to have
6147 This is expected to happen automatically when the pointed-to
6148 type has a name/declaration of it's own, but special attention
6149 is required if the type is anonymous.
6151 We handle the NORMAL and FIELD contexts here by attaching an
6152 artificial TYPE_DECL to such pointed-to type. This forces the
6153 sizes evaluation at a safe point and ensures it is not deferred
6154 until e.g. within a deeper conditional context.
6156 We expect nothing to be needed here for PARM or TYPENAME.
6157 Pushing a TYPE_DECL at this point for TYPENAME would actually
6158 be incorrect, as we might be in the middle of an expression
6159 with side effects on the pointed-to type size "arguments" prior
6160 to the pointer declaration point and the fake TYPE_DECL in the
6161 enclosing context would force the size evaluation prior to the
6164 if (!TYPE_NAME (type
)
6165 && (decl_context
== NORMAL
|| decl_context
== FIELD
)
6166 && variably_modified_type_p (type
, NULL_TREE
))
6168 tree decl
= build_decl (loc
, TYPE_DECL
, NULL_TREE
, type
);
6169 DECL_ARTIFICIAL (decl
) = 1;
6171 finish_decl (decl
, loc
, NULL_TREE
, NULL_TREE
, NULL_TREE
);
6172 TYPE_NAME (type
) = decl
;
6175 type
= c_build_pointer_type (type
);
6177 /* Process type qualifiers (such as const or volatile)
6178 that were given inside the `*'. */
6179 type_quals
= declarator
->u
.pointer_quals
;
6181 declarator
= declarator
->declarator
;
6188 *decl_attrs
= chainon (returned_attrs
, *decl_attrs
);
6190 /* Now TYPE has the actual type, apart from any qualifiers in
6193 /* Warn about address space used for things other than static memory or
6195 address_space
= DECODE_QUAL_ADDR_SPACE (type_quals
);
6196 if (!ADDR_SPACE_GENERIC_P (address_space
))
6198 if (decl_context
== NORMAL
)
6200 switch (storage_class
)
6203 error ("%qs combined with %<auto%> qualifier for %qE",
6204 c_addr_space_name (address_space
), name
);
6207 error ("%qs combined with %<register%> qualifier for %qE",
6208 c_addr_space_name (address_space
), name
);
6211 if (current_function_scope
)
6213 error ("%qs specified for auto variable %qE",
6214 c_addr_space_name (address_space
), name
);
6226 else if (decl_context
== PARM
&& TREE_CODE (type
) != ARRAY_TYPE
)
6229 error ("%qs specified for parameter %qE",
6230 c_addr_space_name (address_space
), name
);
6232 error ("%qs specified for unnamed parameter",
6233 c_addr_space_name (address_space
));
6235 else if (decl_context
== FIELD
)
6238 error ("%qs specified for structure field %qE",
6239 c_addr_space_name (address_space
), name
);
6241 error ("%qs specified for structure field",
6242 c_addr_space_name (address_space
));
6246 /* Check the type and width of a bit-field. */
6249 check_bitfield_type_and_width (&type
, width
, name
);
6250 /* C11 makes it implementation-defined (6.7.2.1#5) whether
6251 atomic types are permitted for bit-fields; we have no code to
6252 make bit-field accesses atomic, so disallow them. */
6253 if (type_quals
& TYPE_QUAL_ATOMIC
)
6256 error ("bit-field %qE has atomic type", name
);
6258 error ("bit-field has atomic type");
6259 type_quals
&= ~TYPE_QUAL_ATOMIC
;
6263 /* Reject invalid uses of _Alignas. */
6264 if (declspecs
->alignas_p
)
6266 if (storage_class
== csc_typedef
)
6267 error_at (loc
, "alignment specified for typedef %qE", name
);
6268 else if (storage_class
== csc_register
)
6269 error_at (loc
, "alignment specified for %<register%> object %qE",
6271 else if (decl_context
== PARM
)
6274 error_at (loc
, "alignment specified for parameter %qE", name
);
6276 error_at (loc
, "alignment specified for unnamed parameter");
6281 error_at (loc
, "alignment specified for bit-field %qE", name
);
6283 error_at (loc
, "alignment specified for unnamed bit-field");
6285 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
6286 error_at (loc
, "alignment specified for function %qE", name
);
6287 else if (declspecs
->align_log
!= -1)
6289 alignas_align
= 1U << declspecs
->align_log
;
6290 if (alignas_align
< min_align_of_type (type
))
6293 error_at (loc
, "%<_Alignas%> specifiers cannot reduce "
6294 "alignment of %qE", name
);
6296 error_at (loc
, "%<_Alignas%> specifiers cannot reduce "
6297 "alignment of unnamed field");
6303 /* Did array size calculations overflow or does the array cover more
6304 than half of the address-space? */
6305 if (TREE_CODE (type
) == ARRAY_TYPE
6306 && COMPLETE_TYPE_P (type
)
6307 && TREE_CODE (TYPE_SIZE_UNIT (type
)) == INTEGER_CST
6308 && ! valid_constant_size_p (TYPE_SIZE_UNIT (type
)))
6311 error_at (loc
, "size of array %qE is too large", name
);
6313 error_at (loc
, "size of unnamed array is too large");
6314 /* If we proceed with the array type as it is, we'll eventually
6315 crash in tree_to_[su]hwi(). */
6316 type
= error_mark_node
;
6319 /* If this is declaring a typedef name, return a TYPE_DECL. */
6321 if (storage_class
== csc_typedef
)
6324 if ((type_quals
& TYPE_QUAL_ATOMIC
)
6325 && TREE_CODE (type
) == FUNCTION_TYPE
)
6328 "%<_Atomic%>-qualified function type");
6329 type_quals
&= ~TYPE_QUAL_ATOMIC
;
6331 else if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
6333 pedwarn (loc
, OPT_Wpedantic
,
6334 "ISO C forbids qualified function types");
6336 type
= c_build_qualified_type (type
, type_quals
);
6337 decl
= build_decl (declarator
->id_loc
,
6338 TYPE_DECL
, declarator
->u
.id
, type
);
6339 if (declspecs
->explicit_signed_p
)
6340 C_TYPEDEF_EXPLICITLY_SIGNED (decl
) = 1;
6341 if (declspecs
->inline_p
)
6342 pedwarn (loc
, 0,"typedef %q+D declared %<inline%>", decl
);
6343 if (declspecs
->noreturn_p
)
6344 pedwarn (loc
, 0,"typedef %q+D declared %<_Noreturn%>", decl
);
6346 if (warn_cxx_compat
&& declarator
->u
.id
!= NULL_TREE
)
6348 struct c_binding
*b
= I_TAG_BINDING (declarator
->u
.id
);
6351 && b
->decl
!= NULL_TREE
6352 && (B_IN_CURRENT_SCOPE (b
)
6353 || (current_scope
== file_scope
&& B_IN_EXTERNAL_SCOPE (b
)))
6354 && TYPE_MAIN_VARIANT (b
->decl
) != TYPE_MAIN_VARIANT (type
))
6356 warning_at (declarator
->id_loc
, OPT_Wc___compat
,
6357 ("using %qD as both a typedef and a tag is "
6360 if (b
->locus
!= UNKNOWN_LOCATION
)
6361 inform (b
->locus
, "originally defined here");
6368 /* If this is a type name (such as, in a cast or sizeof),
6369 compute the type and return it now. */
6371 if (decl_context
== TYPENAME
)
6373 /* Note that the grammar rejects storage classes in typenames
6375 gcc_assert (storage_class
== csc_none
&& !threadp
6376 && !declspecs
->inline_p
&& !declspecs
->noreturn_p
);
6377 if ((type_quals
& TYPE_QUAL_ATOMIC
)
6378 && TREE_CODE (type
) == FUNCTION_TYPE
)
6381 "%<_Atomic%>-qualified function type");
6382 type_quals
&= ~TYPE_QUAL_ATOMIC
;
6384 else if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
6386 pedwarn (loc
, OPT_Wpedantic
,
6387 "ISO C forbids const or volatile function types");
6389 type
= c_build_qualified_type (type
, type_quals
);
6393 if (pedantic
&& decl_context
== FIELD
6394 && variably_modified_type_p (type
, NULL_TREE
))
6397 pedwarn (loc
, OPT_Wpedantic
, "a member of a structure or union cannot "
6398 "have a variably modified type");
6401 /* Aside from typedefs and type names (handle above),
6402 `void' at top level (not within pointer)
6403 is allowed only in public variables.
6404 We don't complain about parms either, but that is because
6405 a better error message can be made later. */
6407 if (VOID_TYPE_P (type
) && decl_context
!= PARM
6408 && !((decl_context
!= FIELD
&& TREE_CODE (type
) != FUNCTION_TYPE
)
6409 && (storage_class
== csc_extern
6410 || (current_scope
== file_scope
6411 && !(storage_class
== csc_static
6412 || storage_class
== csc_register
)))))
6414 error_at (loc
, "variable or field %qE declared void", name
);
6415 type
= integer_type_node
;
6418 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
6419 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
6424 if (decl_context
== PARM
)
6427 bool array_parameter_p
= false;
6429 /* A parameter declared as an array of T is really a pointer to T.
6430 One declared as a function is really a pointer to a function. */
6432 if (TREE_CODE (type
) == ARRAY_TYPE
)
6434 /* Transfer const-ness of array into that of type pointed to. */
6435 type
= TREE_TYPE (type
);
6437 type
= c_build_qualified_type (type
, type_quals
);
6438 type
= c_build_pointer_type (type
);
6439 type_quals
= array_ptr_quals
;
6441 type
= c_build_qualified_type (type
, type_quals
);
6443 /* We don't yet implement attributes in this context. */
6444 if (array_ptr_attrs
!= NULL_TREE
)
6445 warning_at (loc
, OPT_Wattributes
,
6446 "attributes in parameter array declarator ignored");
6448 size_varies
= false;
6449 array_parameter_p
= true;
6451 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
6453 if (type_quals
& TYPE_QUAL_ATOMIC
)
6456 "%<_Atomic%>-qualified function type");
6457 type_quals
&= ~TYPE_QUAL_ATOMIC
;
6459 else if (type_quals
)
6460 pedwarn (loc
, OPT_Wpedantic
,
6461 "ISO C forbids qualified function types");
6463 type
= c_build_qualified_type (type
, type_quals
);
6464 type
= c_build_pointer_type (type
);
6465 type_quals
= TYPE_UNQUALIFIED
;
6467 else if (type_quals
)
6468 type
= c_build_qualified_type (type
, type_quals
);
6470 decl
= build_decl (declarator
->id_loc
,
6471 PARM_DECL
, declarator
->u
.id
, type
);
6473 C_DECL_VARIABLE_SIZE (decl
) = 1;
6474 C_ARRAY_PARAMETER (decl
) = array_parameter_p
;
6476 /* Compute the type actually passed in the parmlist,
6477 for the case where there is no prototype.
6478 (For example, shorts and chars are passed as ints.)
6479 When there is a prototype, this is overridden later. */
6481 if (type
== error_mark_node
)
6482 promoted_type
= type
;
6484 promoted_type
= c_type_promotes_to (type
);
6486 DECL_ARG_TYPE (decl
) = promoted_type
;
6487 if (declspecs
->inline_p
)
6488 pedwarn (loc
, 0, "parameter %q+D declared %<inline%>", decl
);
6489 if (declspecs
->noreturn_p
)
6490 pedwarn (loc
, 0, "parameter %q+D declared %<_Noreturn%>", decl
);
6492 else if (decl_context
== FIELD
)
6494 /* Note that the grammar rejects storage classes in typenames
6496 gcc_assert (storage_class
== csc_none
&& !threadp
6497 && !declspecs
->inline_p
&& !declspecs
->noreturn_p
);
6499 /* Structure field. It may not be a function. */
6501 if (TREE_CODE (type
) == FUNCTION_TYPE
)
6503 error_at (loc
, "field %qE declared as a function", name
);
6504 type
= build_pointer_type (type
);
6506 else if (TREE_CODE (type
) != ERROR_MARK
6507 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type
))
6510 error_at (loc
, "field %qE has incomplete type", name
);
6512 error_at (loc
, "unnamed field has incomplete type");
6513 type
= error_mark_node
;
6515 type
= c_build_qualified_type (type
, type_quals
);
6516 decl
= build_decl (declarator
->id_loc
,
6517 FIELD_DECL
, declarator
->u
.id
, type
);
6518 DECL_NONADDRESSABLE_P (decl
) = bitfield
;
6519 if (bitfield
&& !declarator
->u
.id
)
6520 TREE_NO_WARNING (decl
) = 1;
6523 C_DECL_VARIABLE_SIZE (decl
) = 1;
6525 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
6527 if (storage_class
== csc_register
|| threadp
)
6529 error_at (loc
, "invalid storage class for function %qE", name
);
6531 else if (current_scope
!= file_scope
)
6533 /* Function declaration not at file scope. Storage
6534 classes other than `extern' are not allowed, C99
6535 6.7.1p5, and `extern' makes no difference. However,
6536 GCC allows 'auto', perhaps with 'inline', to support
6537 nested functions. */
6538 if (storage_class
== csc_auto
)
6539 pedwarn (loc
, OPT_Wpedantic
,
6540 "invalid storage class for function %qE", name
);
6541 else if (storage_class
== csc_static
)
6543 error_at (loc
, "invalid storage class for function %qE", name
);
6545 storage_class
= declspecs
->storage_class
= csc_none
;
6551 decl
= build_decl (declarator
->id_loc
,
6552 FUNCTION_DECL
, declarator
->u
.id
, type
);
6553 decl
= build_decl_attribute_variant (decl
, decl_attr
);
6555 if (type_quals
& TYPE_QUAL_ATOMIC
)
6558 "%<_Atomic%>-qualified function type");
6559 type_quals
&= ~TYPE_QUAL_ATOMIC
;
6561 else if (pedantic
&& type_quals
&& !DECL_IN_SYSTEM_HEADER (decl
))
6562 pedwarn (loc
, OPT_Wpedantic
,
6563 "ISO C forbids qualified function types");
6565 /* Every function declaration is an external reference
6566 (DECL_EXTERNAL) except for those which are not at file
6567 scope and are explicitly declared "auto". This is
6568 forbidden by standard C (C99 6.7.1p5) and is interpreted by
6569 GCC to signify a forward declaration of a nested function. */
6570 if (storage_class
== csc_auto
&& current_scope
!= file_scope
)
6571 DECL_EXTERNAL (decl
) = 0;
6572 /* In C99, a function which is declared 'inline' with 'extern'
6573 is not an external reference (which is confusing). It
6574 means that the later definition of the function must be output
6575 in this file, C99 6.7.4p6. In GNU C89, a function declared
6576 'extern inline' is an external reference. */
6577 else if (declspecs
->inline_p
&& storage_class
!= csc_static
)
6578 DECL_EXTERNAL (decl
) = ((storage_class
== csc_extern
)
6579 == flag_gnu89_inline
);
6581 DECL_EXTERNAL (decl
) = !initialized
;
6583 /* Record absence of global scope for `static' or `auto'. */
6585 = !(storage_class
== csc_static
|| storage_class
== csc_auto
);
6587 /* For a function definition, record the argument information
6588 block where store_parm_decls will look for it. */
6590 current_function_arg_info
= arg_info
;
6592 if (declspecs
->default_int_p
)
6593 C_FUNCTION_IMPLICIT_INT (decl
) = 1;
6595 /* Record presence of `inline' and `_Noreturn', if it is
6597 if (flag_hosted
&& MAIN_NAME_P (declarator
->u
.id
))
6599 if (declspecs
->inline_p
)
6600 pedwarn (loc
, 0, "cannot inline function %<main%>");
6601 if (declspecs
->noreturn_p
)
6602 pedwarn (loc
, 0, "%<main%> declared %<_Noreturn%>");
6606 if (declspecs
->inline_p
)
6607 /* Record that the function is declared `inline'. */
6608 DECL_DECLARED_INLINE_P (decl
) = 1;
6609 if (declspecs
->noreturn_p
)
6612 pedwarn_c99 (loc
, OPT_Wpedantic
,
6613 "ISO C99 does not support %<_Noreturn%>");
6615 pedwarn_c99 (loc
, OPT_Wpedantic
,
6616 "ISO C90 does not support %<_Noreturn%>");
6617 TREE_THIS_VOLATILE (decl
) = 1;
6623 /* It's a variable. */
6624 /* An uninitialized decl with `extern' is a reference. */
6625 int extern_ref
= !initialized
&& storage_class
== csc_extern
;
6627 type
= c_build_qualified_type (type
, type_quals
);
6629 /* C99 6.2.2p7: It is invalid (compile-time undefined
6630 behavior) to create an 'extern' declaration for a
6631 variable if there is a global declaration that is
6632 'static' and the global declaration is not visible.
6633 (If the static declaration _is_ currently visible,
6634 the 'extern' declaration is taken to refer to that decl.) */
6635 if (extern_ref
&& current_scope
!= file_scope
)
6637 tree global_decl
= identifier_global_value (declarator
->u
.id
);
6638 tree visible_decl
= lookup_name (declarator
->u
.id
);
6641 && global_decl
!= visible_decl
6642 && TREE_CODE (global_decl
) == VAR_DECL
6643 && !TREE_PUBLIC (global_decl
))
6644 error_at (loc
, "variable previously declared %<static%> "
6645 "redeclared %<extern%>");
6648 decl
= build_decl (declarator
->id_loc
,
6649 VAR_DECL
, declarator
->u
.id
, type
);
6651 C_DECL_VARIABLE_SIZE (decl
) = 1;
6653 if (declspecs
->inline_p
)
6654 pedwarn (loc
, 0, "variable %q+D declared %<inline%>", decl
);
6655 if (declspecs
->noreturn_p
)
6656 pedwarn (loc
, 0, "variable %q+D declared %<_Noreturn%>", decl
);
6658 /* At file scope, an initialized extern declaration may follow
6659 a static declaration. In that case, DECL_EXTERNAL will be
6660 reset later in start_decl. */
6661 DECL_EXTERNAL (decl
) = (storage_class
== csc_extern
);
6663 /* At file scope, the presence of a `static' or `register' storage
6664 class specifier, or the absence of all storage class specifiers
6665 makes this declaration a definition (perhaps tentative). Also,
6666 the absence of `static' makes it public. */
6667 if (current_scope
== file_scope
)
6669 TREE_PUBLIC (decl
) = storage_class
!= csc_static
;
6670 TREE_STATIC (decl
) = !extern_ref
;
6672 /* Not at file scope, only `static' makes a static definition. */
6675 TREE_STATIC (decl
) = (storage_class
== csc_static
);
6676 TREE_PUBLIC (decl
) = extern_ref
;
6680 set_decl_tls_model (decl
, decl_default_tls_model (decl
));
6683 if ((storage_class
== csc_extern
6684 || (storage_class
== csc_none
6685 && TREE_CODE (type
) == FUNCTION_TYPE
6687 && variably_modified_type_p (type
, NULL_TREE
))
6690 if (TREE_CODE (type
) == FUNCTION_TYPE
)
6691 error_at (loc
, "non-nested function with variably modified type");
6693 error_at (loc
, "object with variably modified type must have "
6697 /* Record `register' declaration for warnings on &
6698 and in case doing stupid register allocation. */
6700 if (storage_class
== csc_register
)
6702 C_DECL_REGISTER (decl
) = 1;
6703 DECL_REGISTER (decl
) = 1;
6706 /* Record constancy and volatility. */
6707 c_apply_type_quals_to_decl (type_quals
, decl
);
6709 /* Apply _Alignas specifiers. */
6712 DECL_ALIGN (decl
) = alignas_align
* BITS_PER_UNIT
;
6713 DECL_USER_ALIGN (decl
) = 1;
6716 /* If a type has volatile components, it should be stored in memory.
6717 Otherwise, the fact that those components are volatile
6718 will be ignored, and would even crash the compiler.
6719 Of course, this only makes sense on VAR,PARM, and RESULT decl's. */
6720 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl
))
6721 && (TREE_CODE (decl
) == VAR_DECL
|| TREE_CODE (decl
) == PARM_DECL
6722 || TREE_CODE (decl
) == RESULT_DECL
))
6724 /* It is not an error for a structure with volatile fields to
6725 be declared register, but reset DECL_REGISTER since it
6726 cannot actually go in a register. */
6727 int was_reg
= C_DECL_REGISTER (decl
);
6728 C_DECL_REGISTER (decl
) = 0;
6729 DECL_REGISTER (decl
) = 0;
6730 c_mark_addressable (decl
);
6731 C_DECL_REGISTER (decl
) = was_reg
;
6734 /* This is the earliest point at which we might know the assembler
6735 name of a variable. Thus, if it's known before this, die horribly. */
6736 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl
));
6739 && TREE_CODE (decl
) == VAR_DECL
6740 && TREE_PUBLIC (decl
)
6741 && TREE_STATIC (decl
)
6742 && (TREE_CODE (TREE_TYPE (decl
)) == RECORD_TYPE
6743 || TREE_CODE (TREE_TYPE (decl
)) == UNION_TYPE
6744 || TREE_CODE (TREE_TYPE (decl
)) == ENUMERAL_TYPE
)
6745 && TYPE_NAME (TREE_TYPE (decl
)) == NULL_TREE
)
6746 warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wc___compat
,
6747 ("non-local variable %qD with anonymous type is "
6748 "questionable in C++"),
6755 /* Decode the parameter-list info for a function type or function definition.
6756 The argument is the value returned by `get_parm_info' (or made in c-parse.c
6757 if there is an identifier list instead of a parameter decl list).
6758 These two functions are separate because when a function returns
6759 or receives functions then each is called multiple times but the order
6760 of calls is different. The last call to `grokparms' is always the one
6761 that contains the formal parameter names of a function definition.
6763 Return a list of arg types to use in the FUNCTION_TYPE for this function.
6765 FUNCDEF_FLAG is true for a function definition, false for
6766 a mere declaration. A nonempty identifier-list gets an error message
6767 when FUNCDEF_FLAG is false. */
6770 grokparms (struct c_arg_info
*arg_info
, bool funcdef_flag
)
6772 tree arg_types
= arg_info
->types
;
6774 if (funcdef_flag
&& arg_info
->had_vla_unspec
)
6776 /* A function definition isn't function prototype scope C99 6.2.1p4. */
6778 error ("%<[*]%> not allowed in other than function prototype scope");
6781 if (arg_types
== 0 && !funcdef_flag
6782 && !in_system_header_at (input_location
))
6783 warning (OPT_Wstrict_prototypes
,
6784 "function declaration isn%'t a prototype");
6786 if (arg_types
== error_mark_node
)
6787 return 0; /* don't set TYPE_ARG_TYPES in this case */
6789 else if (arg_types
&& TREE_CODE (TREE_VALUE (arg_types
)) == IDENTIFIER_NODE
)
6793 pedwarn (input_location
, 0, "parameter names (without types) in function declaration");
6794 arg_info
->parms
= NULL_TREE
;
6797 arg_info
->parms
= arg_info
->types
;
6799 arg_info
->types
= 0;
6804 tree parm
, type
, typelt
;
6805 unsigned int parmno
;
6808 /* If there is a parameter of incomplete type in a definition,
6809 this is an error. In a declaration this is valid, and a
6810 struct or union type may be completed later, before any calls
6811 or definition of the function. In the case where the tag was
6812 first declared within the parameter list, a warning has
6813 already been given. If a parameter has void type, then
6814 however the function cannot be defined or called, so
6817 for (parm
= arg_info
->parms
, typelt
= arg_types
, parmno
= 1;
6819 parm
= DECL_CHAIN (parm
), typelt
= TREE_CHAIN (typelt
), parmno
++)
6821 type
= TREE_VALUE (typelt
);
6822 if (type
== error_mark_node
)
6825 if (!COMPLETE_TYPE_P (type
))
6829 if (DECL_NAME (parm
))
6830 error_at (input_location
,
6831 "parameter %u (%q+D) has incomplete type",
6834 error_at (DECL_SOURCE_LOCATION (parm
),
6835 "parameter %u has incomplete type",
6838 TREE_VALUE (typelt
) = error_mark_node
;
6839 TREE_TYPE (parm
) = error_mark_node
;
6840 arg_types
= NULL_TREE
;
6842 else if (VOID_TYPE_P (type
))
6844 if (DECL_NAME (parm
))
6845 warning_at (input_location
, 0,
6846 "parameter %u (%q+D) has void type",
6849 warning_at (DECL_SOURCE_LOCATION (parm
), 0,
6850 "parameter %u has void type",
6855 errmsg
= targetm
.invalid_parameter_type (type
);
6859 TREE_VALUE (typelt
) = error_mark_node
;
6860 TREE_TYPE (parm
) = error_mark_node
;
6861 arg_types
= NULL_TREE
;
6864 if (DECL_NAME (parm
) && TREE_USED (parm
))
6865 warn_if_shadowing (parm
);
6871 /* Allocate and initialize a c_arg_info structure from the parser's
6875 build_arg_info (void)
6877 struct c_arg_info
*ret
= XOBNEW (&parser_obstack
, struct c_arg_info
);
6878 ret
->parms
= NULL_TREE
;
6880 ret
->types
= NULL_TREE
;
6881 ret
->others
= NULL_TREE
;
6882 ret
->pending_sizes
= NULL
;
6883 ret
->had_vla_unspec
= 0;
6887 /* Take apart the current scope and return a c_arg_info structure with
6888 info on a parameter list just parsed.
6890 This structure is later fed to 'grokparms' and 'store_parm_decls'.
6892 ELLIPSIS being true means the argument list ended in '...' so don't
6893 append a sentinel (void_list_node) to the end of the type-list.
6895 EXPR is NULL or an expression that needs to be evaluated for the
6896 side effects of array size expressions in the parameters. */
6899 get_parm_info (bool ellipsis
, tree expr
)
6901 struct c_binding
*b
= current_scope
->bindings
;
6902 struct c_arg_info
*arg_info
= build_arg_info ();
6905 vec
<c_arg_tag
, va_gc
> *tags
= NULL
;
6909 static bool explained_incomplete_types
= false;
6910 bool gave_void_only_once_err
= false;
6912 arg_info
->had_vla_unspec
= current_scope
->had_vla_unspec
;
6914 /* The bindings in this scope must not get put into a block.
6915 We will take care of deleting the binding nodes. */
6916 current_scope
->bindings
= 0;
6918 /* This function is only called if there was *something* on the
6922 /* A parameter list consisting solely of 'void' indicates that the
6923 function takes no arguments. But if the 'void' is qualified
6924 (by 'const' or 'volatile'), or has a storage class specifier
6925 ('register'), then the behavior is undefined; issue an error.
6926 Typedefs for 'void' are OK (see DR#157). */
6927 if (b
->prev
== 0 /* one binding */
6928 && TREE_CODE (b
->decl
) == PARM_DECL
/* which is a parameter */
6929 && !DECL_NAME (b
->decl
) /* anonymous */
6930 && VOID_TYPE_P (TREE_TYPE (b
->decl
))) /* of void type */
6932 if (TYPE_QUALS (TREE_TYPE (b
->decl
)) != TYPE_UNQUALIFIED
6933 || C_DECL_REGISTER (b
->decl
))
6934 error ("%<void%> as only parameter may not be qualified");
6936 /* There cannot be an ellipsis. */
6938 error ("%<void%> must be the only parameter");
6940 arg_info
->types
= void_list_node
;
6945 types
= void_list_node
;
6947 /* Break up the bindings list into parms, tags, types, and others;
6948 apply sanity checks; purge the name-to-decl bindings. */
6951 tree decl
= b
->decl
;
6952 tree type
= TREE_TYPE (decl
);
6954 const char *keyword
;
6956 switch (TREE_CODE (decl
))
6961 gcc_assert (I_SYMBOL_BINDING (b
->id
) == b
);
6962 I_SYMBOL_BINDING (b
->id
) = b
->shadowed
;
6965 /* Check for forward decls that never got their actual decl. */
6966 if (TREE_ASM_WRITTEN (decl
))
6967 error ("parameter %q+D has just a forward declaration", decl
);
6968 /* Check for (..., void, ...) and issue an error. */
6969 else if (VOID_TYPE_P (type
) && !DECL_NAME (decl
))
6971 if (!gave_void_only_once_err
)
6973 error ("%<void%> must be the only parameter");
6974 gave_void_only_once_err
= true;
6979 /* Valid parameter, add it to the list. */
6980 DECL_CHAIN (decl
) = parms
;
6983 /* Since there is a prototype, args are passed in their
6984 declared types. The back end may override this later. */
6985 DECL_ARG_TYPE (decl
) = type
;
6986 types
= tree_cons (0, type
, types
);
6990 case ENUMERAL_TYPE
: keyword
= "enum"; goto tag
;
6991 case UNION_TYPE
: keyword
= "union"; goto tag
;
6992 case RECORD_TYPE
: keyword
= "struct"; goto tag
;
6994 /* Types may not have tag-names, in which case the type
6995 appears in the bindings list with b->id NULL. */
6998 gcc_assert (I_TAG_BINDING (b
->id
) == b
);
6999 I_TAG_BINDING (b
->id
) = b
->shadowed
;
7002 /* Warn about any struct, union or enum tags defined in a
7003 parameter list. The scope of such types is limited to
7004 the parameter list, which is rarely if ever desirable
7005 (it's impossible to call such a function with type-
7006 correct arguments). An anonymous union parm type is
7007 meaningful as a GNU extension, so don't warn for that. */
7008 if (TREE_CODE (decl
) != UNION_TYPE
|| b
->id
!= 0)
7011 /* The %s will be one of 'struct', 'union', or 'enum'. */
7012 warning (0, "%<%s %E%> declared inside parameter list",
7015 /* The %s will be one of 'struct', 'union', or 'enum'. */
7016 warning (0, "anonymous %s declared inside parameter list",
7019 if (!explained_incomplete_types
)
7021 warning (0, "its scope is only this definition or declaration,"
7022 " which is probably not what you want");
7023 explained_incomplete_types
= true;
7029 vec_safe_push (tags
, tag
);
7035 /* CONST_DECLs appear here when we have an embedded enum,
7036 and TYPE_DECLs appear here when we have an embedded struct
7037 or union. No warnings for this - we already warned about the
7038 type itself. FUNCTION_DECLs appear when there is an implicit
7039 function declaration in the parameter list. */
7041 /* When we reinsert this decl in the function body, we need
7042 to reconstruct whether it was marked as nested. */
7043 gcc_assert (TREE_CODE (decl
) == FUNCTION_DECL
7046 DECL_CHAIN (decl
) = others
;
7051 /* error_mark_node appears here when we have an undeclared
7052 variable. Just throw it away. */
7055 gcc_assert (I_SYMBOL_BINDING (b
->id
) == b
);
7056 I_SYMBOL_BINDING (b
->id
) = b
->shadowed
;
7060 /* Other things that might be encountered. */
7067 b
= free_binding_and_advance (b
);
7070 arg_info
->parms
= parms
;
7071 arg_info
->tags
= tags
;
7072 arg_info
->types
= types
;
7073 arg_info
->others
= others
;
7074 arg_info
->pending_sizes
= expr
;
7078 /* Get the struct, enum or union (CODE says which) with tag NAME.
7079 Define the tag as a forward-reference with location LOC if it is
7080 not defined. Return a c_typespec structure for the type
7084 parser_xref_tag (location_t loc
, enum tree_code code
, tree name
)
7086 struct c_typespec ret
;
7090 ret
.expr
= NULL_TREE
;
7091 ret
.expr_const_operands
= true;
7093 /* If a cross reference is requested, look up the type
7094 already defined for this tag and return it. */
7096 ref
= lookup_tag (code
, name
, 0, &refloc
);
7097 /* If this is the right type of tag, return what we found.
7098 (This reference will be shadowed by shadow_tag later if appropriate.)
7099 If this is the wrong type of tag, do not return it. If it was the
7100 wrong type in the same scope, we will have had an error
7101 message already; if in a different scope and declaring
7102 a name, pending_xref_error will give an error message; but if in a
7103 different scope and not declaring a name, this tag should
7104 shadow the previous declaration of a different type of tag, and
7105 this would not work properly if we return the reference found.
7106 (For example, with "struct foo" in an outer scope, "union foo;"
7107 must shadow that tag with a new one of union type.) */
7108 ret
.kind
= (ref
? ctsk_tagref
: ctsk_tagfirstref
);
7109 if (ref
&& TREE_CODE (ref
) == code
)
7111 if (C_TYPE_DEFINED_IN_STRUCT (ref
)
7112 && loc
!= UNKNOWN_LOCATION
7118 warning_at (loc
, OPT_Wc___compat
,
7119 ("enum type defined in struct or union "
7120 "is not visible in C++"));
7121 inform (refloc
, "enum type defined here");
7124 warning_at (loc
, OPT_Wc___compat
,
7125 ("struct defined in struct or union "
7126 "is not visible in C++"));
7127 inform (refloc
, "struct defined here");
7130 warning_at (loc
, OPT_Wc___compat
,
7131 ("union defined in struct or union "
7132 "is not visible in C++"));
7133 inform (refloc
, "union defined here");
7144 /* If no such tag is yet defined, create a forward-reference node
7145 and record it as the "definition".
7146 When a real declaration of this type is found,
7147 the forward-reference will be altered into a real type. */
7149 ref
= make_node (code
);
7150 if (code
== ENUMERAL_TYPE
)
7152 /* Give the type a default layout like unsigned int
7153 to avoid crashing if it does not get defined. */
7154 SET_TYPE_MODE (ref
, TYPE_MODE (unsigned_type_node
));
7155 TYPE_ALIGN (ref
) = TYPE_ALIGN (unsigned_type_node
);
7156 TYPE_USER_ALIGN (ref
) = 0;
7157 TYPE_UNSIGNED (ref
) = 1;
7158 TYPE_PRECISION (ref
) = TYPE_PRECISION (unsigned_type_node
);
7159 TYPE_MIN_VALUE (ref
) = TYPE_MIN_VALUE (unsigned_type_node
);
7160 TYPE_MAX_VALUE (ref
) = TYPE_MAX_VALUE (unsigned_type_node
);
7163 pushtag (loc
, name
, ref
);
7169 /* Get the struct, enum or union (CODE says which) with tag NAME.
7170 Define the tag as a forward-reference if it is not defined.
7171 Return a tree for the type. */
7174 xref_tag (enum tree_code code
, tree name
)
7176 return parser_xref_tag (input_location
, code
, name
).spec
;
7179 /* Make sure that the tag NAME is defined *in the current scope*
7180 at least as a forward reference.
7181 LOC is the location of the struct's definition.
7182 CODE says which kind of tag NAME ought to be.
7184 This stores the current value of the file static STRUCT_PARSE_INFO
7185 in *ENCLOSING_STRUCT_PARSE_INFO, and points STRUCT_PARSE_INFO at a
7186 new c_struct_parse_info structure. The old value of
7187 STRUCT_PARSE_INFO is restored in finish_struct. */
7190 start_struct (location_t loc
, enum tree_code code
, tree name
,
7191 struct c_struct_parse_info
**enclosing_struct_parse_info
)
7193 /* If there is already a tag defined at this scope
7194 (as a forward reference), just return it. */
7196 tree ref
= NULL_TREE
;
7197 location_t refloc
= UNKNOWN_LOCATION
;
7199 if (name
!= NULL_TREE
)
7200 ref
= lookup_tag (code
, name
, 1, &refloc
);
7201 if (ref
&& TREE_CODE (ref
) == code
)
7203 if (TYPE_SIZE (ref
))
7205 if (code
== UNION_TYPE
)
7206 error_at (loc
, "redefinition of %<union %E%>", name
);
7208 error_at (loc
, "redefinition of %<struct %E%>", name
);
7209 if (refloc
!= UNKNOWN_LOCATION
)
7210 inform (refloc
, "originally defined here");
7211 /* Don't create structures using a name already in use. */
7214 else if (C_TYPE_BEING_DEFINED (ref
))
7216 if (code
== UNION_TYPE
)
7217 error_at (loc
, "nested redefinition of %<union %E%>", name
);
7219 error_at (loc
, "nested redefinition of %<struct %E%>", name
);
7220 /* Don't bother to report "originally defined here" for a
7221 nested redefinition; the original definition should be
7223 /* Don't create structures that contain themselves. */
7228 /* Otherwise create a forward-reference just so the tag is in scope. */
7230 if (ref
== NULL_TREE
|| TREE_CODE (ref
) != code
)
7232 ref
= make_node (code
);
7233 pushtag (loc
, name
, ref
);
7236 C_TYPE_BEING_DEFINED (ref
) = 1;
7237 TYPE_PACKED (ref
) = flag_pack_struct
;
7239 *enclosing_struct_parse_info
= struct_parse_info
;
7240 struct_parse_info
= XNEW (struct c_struct_parse_info
);
7241 struct_parse_info
->struct_types
.create (0);
7242 struct_parse_info
->fields
.create (0);
7243 struct_parse_info
->typedefs_seen
.create (0);
7245 /* FIXME: This will issue a warning for a use of a type defined
7246 within a statement expr used within sizeof, et. al. This is not
7247 terribly serious as C++ doesn't permit statement exprs within
7249 if (warn_cxx_compat
&& (in_sizeof
|| in_typeof
|| in_alignof
))
7250 warning_at (loc
, OPT_Wc___compat
,
7251 "defining type in %qs expression is invalid in C++",
7254 : (in_typeof
? "typeof" : "alignof")));
7259 /* Process the specs, declarator and width (NULL if omitted)
7260 of a structure component, returning a FIELD_DECL node.
7261 WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node.
7262 DECL_ATTRS is as for grokdeclarator.
7264 LOC is the location of the structure component.
7266 This is done during the parsing of the struct declaration.
7267 The FIELD_DECL nodes are chained together and the lot of them
7268 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
7271 grokfield (location_t loc
,
7272 struct c_declarator
*declarator
, struct c_declspecs
*declspecs
,
7273 tree width
, tree
*decl_attrs
)
7277 if (declarator
->kind
== cdk_id
&& declarator
->u
.id
== NULL_TREE
7278 && width
== NULL_TREE
)
7280 /* This is an unnamed decl.
7282 If we have something of the form "union { list } ;" then this
7283 is the anonymous union extension. Similarly for struct.
7285 If this is something of the form "struct foo;", then
7286 If MS or Plan 9 extensions are enabled, this is handled as
7287 an anonymous struct.
7288 Otherwise this is a forward declaration of a structure tag.
7290 If this is something of the form "foo;" and foo is a TYPE_DECL, then
7291 If foo names a structure or union without a tag, then this
7292 is an anonymous struct (this is permitted by C11).
7293 If MS or Plan 9 extensions are enabled and foo names a
7294 structure, then again this is an anonymous struct.
7295 Otherwise this is an error.
7297 Oh what a horrid tangled web we weave. I wonder if MS consciously
7298 took this from Plan 9 or if it was an accident of implementation
7299 that took root before someone noticed the bug... */
7301 tree type
= declspecs
->type
;
7302 bool type_ok
= (TREE_CODE (type
) == RECORD_TYPE
7303 || TREE_CODE (type
) == UNION_TYPE
);
7307 && (flag_ms_extensions
7308 || flag_plan9_extensions
7309 || !declspecs
->typedef_p
))
7311 if (flag_ms_extensions
|| flag_plan9_extensions
)
7313 else if (TYPE_NAME (type
) == NULL
)
7320 pedwarn (loc
, 0, "declaration does not declare anything");
7324 pedwarn_c99 (loc
, OPT_Wpedantic
,
7325 "ISO C99 doesn%'t support unnamed structs/unions");
7327 pedwarn_c99 (loc
, OPT_Wpedantic
,
7328 "ISO C90 doesn%'t support unnamed structs/unions");
7331 value
= grokdeclarator (declarator
, declspecs
, FIELD
, false,
7332 width
? &width
: NULL
, decl_attrs
, NULL
, NULL
,
7335 finish_decl (value
, loc
, NULL_TREE
, NULL_TREE
, NULL_TREE
);
7336 DECL_INITIAL (value
) = width
;
7338 if (warn_cxx_compat
&& DECL_NAME (value
) != NULL_TREE
)
7340 /* If we currently have a binding for this field, set the
7341 in_struct field in the binding, so that we warn about lookups
7343 struct c_binding
*b
= I_SYMBOL_BINDING (DECL_NAME (value
));
7346 /* If the in_struct field is not yet set, push it on a list
7347 to be cleared when this struct is finished. */
7350 struct_parse_info
->fields
.safe_push (b
);
7359 /* Subroutine of detect_field_duplicates: return whether X and Y,
7360 which are both fields in the same struct, have duplicate field
7364 is_duplicate_field (tree x
, tree y
)
7366 if (DECL_NAME (x
) != NULL_TREE
&& DECL_NAME (x
) == DECL_NAME (y
))
7369 /* When using -fplan9-extensions, an anonymous field whose name is a
7370 typedef can duplicate a field name. */
7371 if (flag_plan9_extensions
7372 && (DECL_NAME (x
) == NULL_TREE
|| DECL_NAME (y
) == NULL_TREE
))
7374 tree xt
, xn
, yt
, yn
;
7377 if (DECL_NAME (x
) != NULL_TREE
)
7379 else if ((TREE_CODE (xt
) == RECORD_TYPE
|| TREE_CODE (xt
) == UNION_TYPE
)
7380 && TYPE_NAME (xt
) != NULL_TREE
7381 && TREE_CODE (TYPE_NAME (xt
)) == TYPE_DECL
)
7382 xn
= DECL_NAME (TYPE_NAME (xt
));
7387 if (DECL_NAME (y
) != NULL_TREE
)
7389 else if ((TREE_CODE (yt
) == RECORD_TYPE
|| TREE_CODE (yt
) == UNION_TYPE
)
7390 && TYPE_NAME (yt
) != NULL_TREE
7391 && TREE_CODE (TYPE_NAME (yt
)) == TYPE_DECL
)
7392 yn
= DECL_NAME (TYPE_NAME (yt
));
7396 if (xn
!= NULL_TREE
&& xn
== yn
)
7403 /* Subroutine of detect_field_duplicates: add the fields of FIELDLIST
7404 to HTAB, giving errors for any duplicates. */
7407 detect_field_duplicates_hash (tree fieldlist
,
7408 hash_table
<pointer_hash
<tree_node
> > *htab
)
7413 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
7414 if ((y
= DECL_NAME (x
)) != 0)
7416 slot
= htab
->find_slot (y
, INSERT
);
7419 error ("duplicate member %q+D", x
);
7420 DECL_NAME (x
) = NULL_TREE
;
7424 else if (TREE_CODE (TREE_TYPE (x
)) == RECORD_TYPE
7425 || TREE_CODE (TREE_TYPE (x
)) == UNION_TYPE
)
7427 detect_field_duplicates_hash (TYPE_FIELDS (TREE_TYPE (x
)), htab
);
7429 /* When using -fplan9-extensions, an anonymous field whose
7430 name is a typedef can duplicate a field name. */
7431 if (flag_plan9_extensions
7432 && TYPE_NAME (TREE_TYPE (x
)) != NULL_TREE
7433 && TREE_CODE (TYPE_NAME (TREE_TYPE (x
))) == TYPE_DECL
)
7435 tree xn
= DECL_NAME (TYPE_NAME (TREE_TYPE (x
)));
7436 slot
= htab
->find_slot (xn
, INSERT
);
7438 error ("duplicate member %q+D", TYPE_NAME (TREE_TYPE (x
)));
7444 /* Generate an error for any duplicate field names in FIELDLIST. Munge
7445 the list such that this does not present a problem later. */
7448 detect_field_duplicates (tree fieldlist
)
7453 /* If the struct is the list of instance variables of an Objective-C
7454 class, then we need to check all the instance variables of
7455 superclasses when checking for duplicates (since you can't have
7456 an instance variable in a subclass with the same name as an
7457 instance variable in a superclass). We pass on this job to the
7458 Objective-C compiler. objc_detect_field_duplicates() will return
7459 false if we are not checking the list of instance variables and
7460 the C frontend should proceed with the standard field duplicate
7461 checks. If we are checking the list of instance variables, the
7462 ObjC frontend will do the check, emit the errors if needed, and
7463 then return true. */
7464 if (c_dialect_objc ())
7465 if (objc_detect_field_duplicates (false))
7468 /* First, see if there are more than "a few" fields.
7469 This is trivially true if there are zero or one fields. */
7470 if (!fieldlist
|| !DECL_CHAIN (fieldlist
))
7475 if (DECL_NAME (x
) == NULL_TREE
7476 && (TREE_CODE (TREE_TYPE (x
)) == RECORD_TYPE
7477 || TREE_CODE (TREE_TYPE (x
)) == UNION_TYPE
))
7480 } while (timeout
> 0 && x
);
7482 /* If there were "few" fields and no anonymous structures or unions,
7483 avoid the overhead of allocating a hash table. Instead just do
7484 the nested traversal thing. */
7487 for (x
= DECL_CHAIN (fieldlist
); x
; x
= DECL_CHAIN (x
))
7488 /* When using -fplan9-extensions, we can have duplicates
7489 between typedef names and fields. */
7491 || (flag_plan9_extensions
7492 && DECL_NAME (x
) == NULL_TREE
7493 && (TREE_CODE (TREE_TYPE (x
)) == RECORD_TYPE
7494 || TREE_CODE (TREE_TYPE (x
)) == UNION_TYPE
)
7495 && TYPE_NAME (TREE_TYPE (x
)) != NULL_TREE
7496 && TREE_CODE (TYPE_NAME (TREE_TYPE (x
))) == TYPE_DECL
))
7498 for (y
= fieldlist
; y
!= x
; y
= TREE_CHAIN (y
))
7499 if (is_duplicate_field (y
, x
))
7501 error ("duplicate member %q+D", x
);
7502 DECL_NAME (x
) = NULL_TREE
;
7508 hash_table
<pointer_hash
<tree_node
> > htab (37);
7509 detect_field_duplicates_hash (fieldlist
, &htab
);
7513 /* Finish up struct info used by -Wc++-compat. */
7516 warn_cxx_compat_finish_struct (tree fieldlist
)
7520 struct c_binding
*b
;
7522 /* Set the C_TYPE_DEFINED_IN_STRUCT flag for each type defined in
7523 the current struct. We do this now at the end of the struct
7524 because the flag is used to issue visibility warnings, and we
7525 only want to issue those warnings if the type is referenced
7526 outside of the struct declaration. */
7527 FOR_EACH_VEC_ELT (struct_parse_info
->struct_types
, ix
, x
)
7528 C_TYPE_DEFINED_IN_STRUCT (x
) = 1;
7530 /* The TYPEDEFS_SEEN field of STRUCT_PARSE_INFO is a list of
7531 typedefs used when declaring fields in this struct. If the name
7532 of any of the fields is also a typedef name then the struct would
7533 not parse in C++, because the C++ lookup rules say that the
7534 typedef name would be looked up in the context of the struct, and
7535 would thus be the field rather than the typedef. */
7536 if (!struct_parse_info
->typedefs_seen
.is_empty ()
7537 && fieldlist
!= NULL_TREE
)
7539 /* Use a hash_set<tree> using the name of the typedef. We can use
7540 a hash_set<tree> because identifiers are interned. */
7541 hash_set
<tree
> tset
;
7543 FOR_EACH_VEC_ELT (struct_parse_info
->typedefs_seen
, ix
, x
)
7544 tset
.add (DECL_NAME (x
));
7546 for (x
= fieldlist
; x
!= NULL_TREE
; x
= DECL_CHAIN (x
))
7548 if (DECL_NAME (x
) != NULL_TREE
7549 && tset
.contains (DECL_NAME (x
)))
7551 warning_at (DECL_SOURCE_LOCATION (x
), OPT_Wc___compat
,
7552 ("using %qD as both field and typedef name is "
7555 /* FIXME: It would be nice to report the location where
7556 the typedef name is used. */
7561 /* For each field which has a binding and which was not defined in
7562 an enclosing struct, clear the in_struct field. */
7563 FOR_EACH_VEC_ELT (struct_parse_info
->fields
, ix
, b
)
7567 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
7568 LOC is the location of the RECORD_TYPE or UNION_TYPE's definition.
7569 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
7570 ATTRIBUTES are attributes to be applied to the structure.
7572 ENCLOSING_STRUCT_PARSE_INFO is the value of STRUCT_PARSE_INFO when
7573 the struct was started. */
7576 finish_struct (location_t loc
, tree t
, tree fieldlist
, tree attributes
,
7577 struct c_struct_parse_info
*enclosing_struct_parse_info
)
7580 bool toplevel
= file_scope
== current_scope
;
7581 int saw_named_field
;
7583 /* If this type was previously laid out as a forward reference,
7584 make sure we lay it out again. */
7588 decl_attributes (&t
, attributes
, (int) ATTR_FLAG_TYPE_IN_PLACE
);
7592 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
7594 if (DECL_NAME (x
) != 0)
7597 && (TREE_CODE (TREE_TYPE (x
)) == RECORD_TYPE
7598 || TREE_CODE (TREE_TYPE (x
)) == UNION_TYPE
))
7604 if (TREE_CODE (t
) == UNION_TYPE
)
7607 pedwarn (loc
, OPT_Wpedantic
, "union has no named members");
7609 pedwarn (loc
, OPT_Wpedantic
, "union has no members");
7614 pedwarn (loc
, OPT_Wpedantic
, "struct has no named members");
7616 pedwarn (loc
, OPT_Wpedantic
, "struct has no members");
7621 /* Install struct as DECL_CONTEXT of each field decl.
7622 Also process specified field sizes, found in the DECL_INITIAL,
7623 storing 0 there after the type has been changed to precision equal
7624 to its width, rather than the precision of the specified standard
7625 type. (Correct layout requires the original type to have been preserved
7628 saw_named_field
= 0;
7629 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
7631 if (TREE_TYPE (x
) == error_mark_node
)
7634 DECL_CONTEXT (x
) = t
;
7636 /* If any field is const, the structure type is pseudo-const. */
7637 if (TREE_READONLY (x
))
7638 C_TYPE_FIELDS_READONLY (t
) = 1;
7641 /* A field that is pseudo-const makes the structure likewise. */
7642 tree t1
= strip_array_types (TREE_TYPE (x
));
7643 if ((TREE_CODE (t1
) == RECORD_TYPE
|| TREE_CODE (t1
) == UNION_TYPE
)
7644 && C_TYPE_FIELDS_READONLY (t1
))
7645 C_TYPE_FIELDS_READONLY (t
) = 1;
7648 /* Any field that is volatile means variables of this type must be
7649 treated in some ways as volatile. */
7650 if (TREE_THIS_VOLATILE (x
))
7651 C_TYPE_FIELDS_VOLATILE (t
) = 1;
7653 /* Any field of nominal variable size implies structure is too. */
7654 if (C_DECL_VARIABLE_SIZE (x
))
7655 C_TYPE_VARIABLE_SIZE (t
) = 1;
7657 if (DECL_INITIAL (x
))
7659 unsigned HOST_WIDE_INT width
= tree_to_uhwi (DECL_INITIAL (x
));
7660 DECL_SIZE (x
) = bitsize_int (width
);
7661 DECL_BIT_FIELD (x
) = 1;
7662 SET_DECL_C_BIT_FIELD (x
);
7666 && (DECL_BIT_FIELD (x
)
7667 || TYPE_ALIGN (TREE_TYPE (x
)) > BITS_PER_UNIT
))
7668 DECL_PACKED (x
) = 1;
7670 /* Detect flexible array member in an invalid context. */
7671 if (TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
7672 && TYPE_SIZE (TREE_TYPE (x
)) == NULL_TREE
7673 && TYPE_DOMAIN (TREE_TYPE (x
)) != NULL_TREE
7674 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x
))) == NULL_TREE
)
7676 if (TREE_CODE (t
) == UNION_TYPE
)
7678 error_at (DECL_SOURCE_LOCATION (x
),
7679 "flexible array member in union");
7680 TREE_TYPE (x
) = error_mark_node
;
7682 else if (DECL_CHAIN (x
) != NULL_TREE
)
7684 error_at (DECL_SOURCE_LOCATION (x
),
7685 "flexible array member not at end of struct");
7686 TREE_TYPE (x
) = error_mark_node
;
7688 else if (!saw_named_field
)
7690 error_at (DECL_SOURCE_LOCATION (x
),
7691 "flexible array member in otherwise empty struct");
7692 TREE_TYPE (x
) = error_mark_node
;
7696 if (pedantic
&& TREE_CODE (t
) == RECORD_TYPE
7697 && flexible_array_type_p (TREE_TYPE (x
)))
7698 pedwarn (DECL_SOURCE_LOCATION (x
), OPT_Wpedantic
,
7699 "invalid use of structure with flexible array member");
7702 || TREE_CODE (TREE_TYPE (x
)) == RECORD_TYPE
7703 || TREE_CODE (TREE_TYPE (x
)) == UNION_TYPE
)
7704 saw_named_field
= 1;
7707 detect_field_duplicates (fieldlist
);
7709 /* Now we have the nearly final fieldlist. Record it,
7710 then lay out the structure or union (including the fields). */
7712 TYPE_FIELDS (t
) = fieldlist
;
7716 if (TYPE_SIZE_UNIT (t
)
7717 && TREE_CODE (TYPE_SIZE_UNIT (t
)) == INTEGER_CST
7718 && !TREE_OVERFLOW (TYPE_SIZE_UNIT (t
))
7719 && !valid_constant_size_p (TYPE_SIZE_UNIT (t
)))
7720 error ("type %qT is too large", t
);
7722 /* Give bit-fields their proper types. */
7724 tree
*fieldlistp
= &fieldlist
;
7726 if (TREE_CODE (*fieldlistp
) == FIELD_DECL
&& DECL_INITIAL (*fieldlistp
)
7727 && TREE_TYPE (*fieldlistp
) != error_mark_node
)
7729 unsigned HOST_WIDE_INT width
7730 = tree_to_uhwi (DECL_INITIAL (*fieldlistp
));
7731 tree type
= TREE_TYPE (*fieldlistp
);
7732 if (width
!= TYPE_PRECISION (type
))
7734 TREE_TYPE (*fieldlistp
)
7735 = c_build_bitfield_integer_type (width
, TYPE_UNSIGNED (type
));
7736 DECL_MODE (*fieldlistp
) = TYPE_MODE (TREE_TYPE (*fieldlistp
));
7738 DECL_INITIAL (*fieldlistp
) = 0;
7741 fieldlistp
= &DECL_CHAIN (*fieldlistp
);
7744 /* Now we have the truly final field list.
7745 Store it in this type and in the variants. */
7747 TYPE_FIELDS (t
) = fieldlist
;
7749 /* If there are lots of fields, sort so we can look through them fast.
7750 We arbitrarily consider 16 or more elts to be "a lot". */
7755 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
7757 if (len
> 15 || DECL_NAME (x
) == NULL
)
7765 struct lang_type
*space
;
7766 struct sorted_fields_type
*space2
;
7768 len
+= list_length (x
);
7770 /* Use the same allocation policy here that make_node uses, to
7771 ensure that this lives as long as the rest of the struct decl.
7772 All decls in an inline function need to be saved. */
7774 space
= ggc_cleared_alloc
<struct lang_type
> ();
7775 space2
= (sorted_fields_type
*) ggc_internal_alloc
7776 (sizeof (struct sorted_fields_type
) + len
* sizeof (tree
));
7780 field_array
= &space2
->elts
[0];
7781 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
7783 field_array
[len
++] = x
;
7785 /* If there is anonymous struct or union, break out of the loop. */
7786 if (DECL_NAME (x
) == NULL
)
7789 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
7792 TYPE_LANG_SPECIFIC (t
) = space
;
7793 TYPE_LANG_SPECIFIC (t
)->s
->len
= len
;
7794 field_array
= TYPE_LANG_SPECIFIC (t
)->s
->elts
;
7795 qsort (field_array
, len
, sizeof (tree
), field_decl_cmp
);
7800 for (x
= TYPE_MAIN_VARIANT (t
); x
; x
= TYPE_NEXT_VARIANT (x
))
7802 TYPE_FIELDS (x
) = TYPE_FIELDS (t
);
7803 TYPE_LANG_SPECIFIC (x
) = TYPE_LANG_SPECIFIC (t
);
7804 C_TYPE_FIELDS_READONLY (x
) = C_TYPE_FIELDS_READONLY (t
);
7805 C_TYPE_FIELDS_VOLATILE (x
) = C_TYPE_FIELDS_VOLATILE (t
);
7806 C_TYPE_VARIABLE_SIZE (x
) = C_TYPE_VARIABLE_SIZE (t
);
7809 /* If this was supposed to be a transparent union, but we can't
7810 make it one, warn and turn off the flag. */
7811 if (TREE_CODE (t
) == UNION_TYPE
7812 && TYPE_TRANSPARENT_AGGR (t
)
7813 && (!TYPE_FIELDS (t
) || TYPE_MODE (t
) != DECL_MODE (TYPE_FIELDS (t
))))
7815 TYPE_TRANSPARENT_AGGR (t
) = 0;
7816 warning_at (loc
, 0, "union cannot be made transparent");
7819 /* If this structure or union completes the type of any previous
7820 variable declaration, lay it out and output its rtl. */
7821 for (x
= C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t
));
7825 tree decl
= TREE_VALUE (x
);
7826 if (TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
)
7827 layout_array_type (TREE_TYPE (decl
));
7828 if (TREE_CODE (decl
) != TYPE_DECL
)
7830 layout_decl (decl
, 0);
7831 if (c_dialect_objc ())
7832 objc_check_decl (decl
);
7833 rest_of_decl_compilation (decl
, toplevel
, 0);
7836 C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t
)) = 0;
7838 /* Update type location to the one of the definition, instead of e.g.
7839 a forward declaration. */
7840 if (TYPE_STUB_DECL (t
))
7841 DECL_SOURCE_LOCATION (TYPE_STUB_DECL (t
)) = loc
;
7843 /* Finish debugging output for this type. */
7844 rest_of_type_compilation (t
, toplevel
);
7846 /* If we're inside a function proper, i.e. not file-scope and not still
7847 parsing parameters, then arrange for the size of a variable sized type
7849 if (building_stmt_list_p () && variably_modified_type_p (t
, NULL_TREE
))
7850 add_stmt (build_stmt (loc
,
7851 DECL_EXPR
, build_decl (loc
, TYPE_DECL
, NULL
, t
)));
7853 if (warn_cxx_compat
)
7854 warn_cxx_compat_finish_struct (fieldlist
);
7856 struct_parse_info
->struct_types
.release ();
7857 struct_parse_info
->fields
.release ();
7858 struct_parse_info
->typedefs_seen
.release ();
7859 XDELETE (struct_parse_info
);
7861 struct_parse_info
= enclosing_struct_parse_info
;
7863 /* If this struct is defined inside a struct, add it to
7866 && struct_parse_info
!= NULL
7867 && !in_sizeof
&& !in_typeof
&& !in_alignof
)
7868 struct_parse_info
->struct_types
.safe_push (t
);
7873 /* Lay out the type T, and its element type, and so on. */
7876 layout_array_type (tree t
)
7878 if (TREE_CODE (TREE_TYPE (t
)) == ARRAY_TYPE
)
7879 layout_array_type (TREE_TYPE (t
));
7883 /* Begin compiling the definition of an enumeration type.
7884 NAME is its name (or null if anonymous).
7885 LOC is the enum's location.
7886 Returns the type object, as yet incomplete.
7887 Also records info about it so that build_enumerator
7888 may be used to declare the individual values as they are read. */
7891 start_enum (location_t loc
, struct c_enum_contents
*the_enum
, tree name
)
7893 tree enumtype
= NULL_TREE
;
7894 location_t enumloc
= UNKNOWN_LOCATION
;
7896 /* If this is the real definition for a previous forward reference,
7897 fill in the contents in the same object that used to be the
7898 forward reference. */
7900 if (name
!= NULL_TREE
)
7901 enumtype
= lookup_tag (ENUMERAL_TYPE
, name
, 1, &enumloc
);
7903 if (enumtype
== 0 || TREE_CODE (enumtype
) != ENUMERAL_TYPE
)
7905 enumtype
= make_node (ENUMERAL_TYPE
);
7906 pushtag (loc
, name
, enumtype
);
7909 if (C_TYPE_BEING_DEFINED (enumtype
))
7910 error_at (loc
, "nested redefinition of %<enum %E%>", name
);
7912 C_TYPE_BEING_DEFINED (enumtype
) = 1;
7914 if (TYPE_VALUES (enumtype
) != 0)
7916 /* This enum is a named one that has been declared already. */
7917 error_at (loc
, "redeclaration of %<enum %E%>", name
);
7918 if (enumloc
!= UNKNOWN_LOCATION
)
7919 inform (enumloc
, "originally defined here");
7921 /* Completely replace its old definition.
7922 The old enumerators remain defined, however. */
7923 TYPE_VALUES (enumtype
) = 0;
7926 the_enum
->enum_next_value
= integer_zero_node
;
7927 the_enum
->enum_overflow
= 0;
7929 if (flag_short_enums
)
7930 TYPE_PACKED (enumtype
) = 1;
7932 /* FIXME: This will issue a warning for a use of a type defined
7933 within sizeof in a statement expr. This is not terribly serious
7934 as C++ doesn't permit statement exprs within sizeof anyhow. */
7935 if (warn_cxx_compat
&& (in_sizeof
|| in_typeof
|| in_alignof
))
7936 warning_at (loc
, OPT_Wc___compat
,
7937 "defining type in %qs expression is invalid in C++",
7940 : (in_typeof
? "typeof" : "alignof")));
7945 /* After processing and defining all the values of an enumeration type,
7946 install their decls in the enumeration type and finish it off.
7947 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
7948 and ATTRIBUTES are the specified attributes.
7949 Returns ENUMTYPE. */
7952 finish_enum (tree enumtype
, tree values
, tree attributes
)
7955 tree minnode
= 0, maxnode
= 0;
7958 bool toplevel
= (file_scope
== current_scope
);
7959 struct lang_type
*lt
;
7961 decl_attributes (&enumtype
, attributes
, (int) ATTR_FLAG_TYPE_IN_PLACE
);
7963 /* Calculate the maximum value of any enumerator in this type. */
7965 if (values
== error_mark_node
)
7966 minnode
= maxnode
= integer_zero_node
;
7969 minnode
= maxnode
= TREE_VALUE (values
);
7970 for (pair
= TREE_CHAIN (values
); pair
; pair
= TREE_CHAIN (pair
))
7972 tree value
= TREE_VALUE (pair
);
7973 if (tree_int_cst_lt (maxnode
, value
))
7975 if (tree_int_cst_lt (value
, minnode
))
7980 /* Construct the final type of this enumeration. It is the same
7981 as one of the integral types - the narrowest one that fits, except
7982 that normally we only go as narrow as int - and signed iff any of
7983 the values are negative. */
7984 sign
= (tree_int_cst_sgn (minnode
) >= 0) ? UNSIGNED
: SIGNED
;
7985 precision
= MAX (tree_int_cst_min_precision (minnode
, sign
),
7986 tree_int_cst_min_precision (maxnode
, sign
));
7988 if (TYPE_PACKED (enumtype
) || precision
> TYPE_PRECISION (integer_type_node
))
7990 tem
= c_common_type_for_size (precision
, sign
== UNSIGNED
? 1 : 0);
7993 warning (0, "enumeration values exceed range of largest integer");
7994 tem
= long_long_integer_type_node
;
7998 tem
= sign
== UNSIGNED
? unsigned_type_node
: integer_type_node
;
8000 TYPE_MIN_VALUE (enumtype
) = TYPE_MIN_VALUE (tem
);
8001 TYPE_MAX_VALUE (enumtype
) = TYPE_MAX_VALUE (tem
);
8002 TYPE_UNSIGNED (enumtype
) = TYPE_UNSIGNED (tem
);
8003 TYPE_SIZE (enumtype
) = 0;
8005 /* If the precision of the type was specific with an attribute and it
8006 was too small, give an error. Otherwise, use it. */
8007 if (TYPE_PRECISION (enumtype
))
8009 if (precision
> TYPE_PRECISION (enumtype
))
8010 error ("specified mode too small for enumeral values");
8013 TYPE_PRECISION (enumtype
) = TYPE_PRECISION (tem
);
8015 layout_type (enumtype
);
8017 if (values
!= error_mark_node
)
8019 /* Change the type of the enumerators to be the enum type. We
8020 need to do this irrespective of the size of the enum, for
8021 proper type checking. Replace the DECL_INITIALs of the
8022 enumerators, and the value slots of the list, with copies
8023 that have the enum type; they cannot be modified in place
8024 because they may be shared (e.g. integer_zero_node) Finally,
8025 change the purpose slots to point to the names of the decls. */
8026 for (pair
= values
; pair
; pair
= TREE_CHAIN (pair
))
8028 tree enu
= TREE_PURPOSE (pair
);
8029 tree ini
= DECL_INITIAL (enu
);
8031 TREE_TYPE (enu
) = enumtype
;
8033 /* The ISO C Standard mandates enumerators to have type int,
8034 even though the underlying type of an enum type is
8035 unspecified. However, GCC allows enumerators of any
8036 integer type as an extensions. build_enumerator()
8037 converts any enumerators that fit in an int to type int,
8038 to avoid promotions to unsigned types when comparing
8039 integers with enumerators that fit in the int range.
8040 When -pedantic is given, build_enumerator() would have
8041 already warned about those that don't fit. Here we
8042 convert the rest to the enumerator type. */
8043 if (TREE_TYPE (ini
) != integer_type_node
)
8044 ini
= convert (enumtype
, ini
);
8046 DECL_INITIAL (enu
) = ini
;
8047 TREE_PURPOSE (pair
) = DECL_NAME (enu
);
8048 TREE_VALUE (pair
) = ini
;
8051 TYPE_VALUES (enumtype
) = values
;
8054 /* Record the min/max values so that we can warn about bit-field
8055 enumerations that are too small for the values. */
8056 lt
= ggc_cleared_alloc
<struct lang_type
> ();
8057 lt
->enum_min
= minnode
;
8058 lt
->enum_max
= maxnode
;
8059 TYPE_LANG_SPECIFIC (enumtype
) = lt
;
8061 /* Fix up all variant types of this enum type. */
8062 for (tem
= TYPE_MAIN_VARIANT (enumtype
); tem
; tem
= TYPE_NEXT_VARIANT (tem
))
8064 if (tem
== enumtype
)
8066 TYPE_VALUES (tem
) = TYPE_VALUES (enumtype
);
8067 TYPE_MIN_VALUE (tem
) = TYPE_MIN_VALUE (enumtype
);
8068 TYPE_MAX_VALUE (tem
) = TYPE_MAX_VALUE (enumtype
);
8069 TYPE_SIZE (tem
) = TYPE_SIZE (enumtype
);
8070 TYPE_SIZE_UNIT (tem
) = TYPE_SIZE_UNIT (enumtype
);
8071 SET_TYPE_MODE (tem
, TYPE_MODE (enumtype
));
8072 TYPE_PRECISION (tem
) = TYPE_PRECISION (enumtype
);
8073 TYPE_ALIGN (tem
) = TYPE_ALIGN (enumtype
);
8074 TYPE_USER_ALIGN (tem
) = TYPE_USER_ALIGN (enumtype
);
8075 TYPE_UNSIGNED (tem
) = TYPE_UNSIGNED (enumtype
);
8076 TYPE_LANG_SPECIFIC (tem
) = TYPE_LANG_SPECIFIC (enumtype
);
8079 /* Finish debugging output for this type. */
8080 rest_of_type_compilation (enumtype
, toplevel
);
8082 /* If this enum is defined inside a struct, add it to
8085 && struct_parse_info
!= NULL
8086 && !in_sizeof
&& !in_typeof
&& !in_alignof
)
8087 struct_parse_info
->struct_types
.safe_push (enumtype
);
8092 /* Build and install a CONST_DECL for one value of the
8093 current enumeration type (one that was begun with start_enum).
8094 DECL_LOC is the location of the enumerator.
8095 LOC is the location of the '=' operator if any, DECL_LOC otherwise.
8096 Return a tree-list containing the CONST_DECL and its value.
8097 Assignment of sequential values by default is handled here. */
8100 build_enumerator (location_t decl_loc
, location_t loc
,
8101 struct c_enum_contents
*the_enum
, tree name
, tree value
)
8105 /* Validate and default VALUE. */
8109 /* Don't issue more errors for error_mark_node (i.e. an
8110 undeclared identifier) - just ignore the value expression. */
8111 if (value
== error_mark_node
)
8113 else if (!INTEGRAL_TYPE_P (TREE_TYPE (value
)))
8115 error_at (loc
, "enumerator value for %qE is not an integer constant",
8121 if (TREE_CODE (value
) != INTEGER_CST
)
8123 value
= c_fully_fold (value
, false, NULL
);
8124 if (TREE_CODE (value
) == INTEGER_CST
)
8125 pedwarn (loc
, OPT_Wpedantic
,
8126 "enumerator value for %qE is not an integer "
8127 "constant expression", name
);
8129 if (TREE_CODE (value
) != INTEGER_CST
)
8131 error ("enumerator value for %qE is not an integer constant",
8137 value
= default_conversion (value
);
8138 constant_expression_warning (value
);
8143 /* Default based on previous value. */
8144 /* It should no longer be possible to have NON_LVALUE_EXPR
8148 value
= the_enum
->enum_next_value
;
8149 if (the_enum
->enum_overflow
)
8150 error_at (loc
, "overflow in enumeration values");
8152 /* Even though the underlying type of an enum is unspecified, the
8153 type of enumeration constants is explicitly defined as int
8154 (6.4.4.3/2 in the C99 Standard). GCC allows any integer type as
8156 else if (!int_fits_type_p (value
, integer_type_node
))
8157 pedwarn (loc
, OPT_Wpedantic
,
8158 "ISO C restricts enumerator values to range of %<int%>");
8160 /* The ISO C Standard mandates enumerators to have type int, even
8161 though the underlying type of an enum type is unspecified.
8162 However, GCC allows enumerators of any integer type as an
8163 extensions. Here we convert any enumerators that fit in an int
8164 to type int, to avoid promotions to unsigned types when comparing
8165 integers with enumerators that fit in the int range. When
8166 -pedantic is given, we would have already warned about those that
8167 don't fit. We have to do this here rather than in finish_enum
8168 because this value may be used to define more enumerators. */
8169 if (int_fits_type_p (value
, integer_type_node
))
8170 value
= convert (integer_type_node
, value
);
8172 /* Set basis for default for next value. */
8173 the_enum
->enum_next_value
8174 = build_binary_op (EXPR_LOC_OR_LOC (value
, input_location
),
8175 PLUS_EXPR
, value
, integer_one_node
, 0);
8176 the_enum
->enum_overflow
= tree_int_cst_lt (the_enum
->enum_next_value
, value
);
8178 /* Now create a declaration for the enum value name. */
8180 type
= TREE_TYPE (value
);
8181 type
= c_common_type_for_size (MAX (TYPE_PRECISION (type
),
8182 TYPE_PRECISION (integer_type_node
)),
8183 (TYPE_PRECISION (type
)
8184 >= TYPE_PRECISION (integer_type_node
)
8185 && TYPE_UNSIGNED (type
)));
8187 decl
= build_decl (decl_loc
, CONST_DECL
, name
, type
);
8188 DECL_INITIAL (decl
) = convert (type
, value
);
8191 return tree_cons (decl
, value
, NULL_TREE
);
8195 /* Create the FUNCTION_DECL for a function definition.
8196 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
8197 the declaration; they describe the function's name and the type it returns,
8198 but twisted together in a fashion that parallels the syntax of C.
8200 This function creates a binding context for the function body
8201 as well as setting up the FUNCTION_DECL in current_function_decl.
8203 Returns 1 on success. If the DECLARATOR is not suitable for a function
8204 (it defines a datum instead), we return 0, which tells
8205 yyparse to report a parse error. */
8208 start_function (struct c_declspecs
*declspecs
, struct c_declarator
*declarator
,
8211 tree decl1
, old_decl
;
8212 tree restype
, resdecl
;
8215 current_function_returns_value
= 0; /* Assume, until we see it does. */
8216 current_function_returns_null
= 0;
8217 current_function_returns_abnormally
= 0;
8218 warn_about_return_type
= 0;
8219 c_switch_stack
= NULL
;
8221 /* Indicate no valid break/continue context by setting these variables
8222 to some non-null, non-label value. We'll notice and emit the proper
8223 error message in c_finish_bc_stmt. */
8224 c_break_label
= c_cont_label
= size_zero_node
;
8226 decl1
= grokdeclarator (declarator
, declspecs
, FUNCDEF
, true, NULL
,
8227 &attributes
, NULL
, NULL
, DEPRECATED_NORMAL
);
8229 /* If the declarator is not suitable for a function definition,
8230 cause a syntax error. */
8232 || TREE_CODE (decl1
) != FUNCTION_DECL
)
8235 loc
= DECL_SOURCE_LOCATION (decl1
);
8237 c_decl_attributes (&decl1
, attributes
, 0);
8239 if (DECL_DECLARED_INLINE_P (decl1
)
8240 && DECL_UNINLINABLE (decl1
)
8241 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1
)))
8242 warning_at (loc
, OPT_Wattributes
,
8243 "inline function %qD given attribute noinline",
8246 /* Handle gnu_inline attribute. */
8247 if (declspecs
->inline_p
8248 && !flag_gnu89_inline
8249 && TREE_CODE (decl1
) == FUNCTION_DECL
8250 && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl1
))
8251 || current_function_decl
))
8253 if (declspecs
->storage_class
!= csc_static
)
8254 DECL_EXTERNAL (decl1
) = !DECL_EXTERNAL (decl1
);
8257 announce_function (decl1
);
8259 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1
))))
8261 error_at (loc
, "return type is an incomplete type");
8262 /* Make it return void instead. */
8264 = build_function_type (void_type_node
,
8265 TYPE_ARG_TYPES (TREE_TYPE (decl1
)));
8268 if (warn_about_return_type
)
8269 warn_defaults_to (loc
, flag_isoc99
? OPT_Wimplicit_int
8270 : (warn_return_type
? OPT_Wreturn_type
8271 : OPT_Wimplicit_int
),
8272 "return type defaults to %<int%>");
8274 /* Make the init_value nonzero so pushdecl knows this is not tentative.
8275 error_mark_node is replaced below (in pop_scope) with the BLOCK. */
8276 DECL_INITIAL (decl1
) = error_mark_node
;
8278 /* A nested function is not global. */
8279 if (current_function_decl
!= 0)
8280 TREE_PUBLIC (decl1
) = 0;
8282 /* If this definition isn't a prototype and we had a prototype declaration
8283 before, copy the arg type info from that prototype. */
8284 old_decl
= lookup_name_in_scope (DECL_NAME (decl1
), current_scope
);
8285 if (old_decl
&& TREE_CODE (old_decl
) != FUNCTION_DECL
)
8287 current_function_prototype_locus
= UNKNOWN_LOCATION
;
8288 current_function_prototype_built_in
= false;
8289 current_function_prototype_arg_types
= NULL_TREE
;
8290 if (!prototype_p (TREE_TYPE (decl1
)))
8292 if (old_decl
!= 0 && TREE_CODE (TREE_TYPE (old_decl
)) == FUNCTION_TYPE
8293 && comptypes (TREE_TYPE (TREE_TYPE (decl1
)),
8294 TREE_TYPE (TREE_TYPE (old_decl
))))
8296 TREE_TYPE (decl1
) = composite_type (TREE_TYPE (old_decl
),
8298 current_function_prototype_locus
= DECL_SOURCE_LOCATION (old_decl
);
8299 current_function_prototype_built_in
8300 = C_DECL_BUILTIN_PROTOTYPE (old_decl
);
8301 current_function_prototype_arg_types
8302 = TYPE_ARG_TYPES (TREE_TYPE (decl1
));
8304 if (TREE_PUBLIC (decl1
))
8306 /* If there is an external prototype declaration of this
8307 function, record its location but do not copy information
8308 to this decl. This may be an invisible declaration
8309 (built-in or in a scope which has finished) or simply
8310 have more refined argument types than any declaration
8312 struct c_binding
*b
;
8313 for (b
= I_SYMBOL_BINDING (DECL_NAME (decl1
)); b
; b
= b
->shadowed
)
8314 if (B_IN_SCOPE (b
, external_scope
))
8318 tree ext_decl
, ext_type
;
8320 ext_type
= b
->u
.type
? b
->u
.type
: TREE_TYPE (ext_decl
);
8321 if (TREE_CODE (ext_type
) == FUNCTION_TYPE
8322 && comptypes (TREE_TYPE (TREE_TYPE (decl1
)),
8323 TREE_TYPE (ext_type
)))
8325 current_function_prototype_locus
8326 = DECL_SOURCE_LOCATION (ext_decl
);
8327 current_function_prototype_built_in
8328 = C_DECL_BUILTIN_PROTOTYPE (ext_decl
);
8329 current_function_prototype_arg_types
8330 = TYPE_ARG_TYPES (ext_type
);
8336 /* Optionally warn of old-fashioned def with no previous prototype. */
8337 if (warn_strict_prototypes
8338 && old_decl
!= error_mark_node
8339 && !prototype_p (TREE_TYPE (decl1
))
8340 && C_DECL_ISNT_PROTOTYPE (old_decl
))
8341 warning_at (loc
, OPT_Wstrict_prototypes
,
8342 "function declaration isn%'t a prototype");
8343 /* Optionally warn of any global def with no previous prototype. */
8344 else if (warn_missing_prototypes
8345 && old_decl
!= error_mark_node
8346 && TREE_PUBLIC (decl1
)
8347 && !MAIN_NAME_P (DECL_NAME (decl1
))
8348 && C_DECL_ISNT_PROTOTYPE (old_decl
)
8349 && !DECL_DECLARED_INLINE_P (decl1
))
8350 warning_at (loc
, OPT_Wmissing_prototypes
,
8351 "no previous prototype for %qD", decl1
);
8352 /* Optionally warn of any def with no previous prototype
8353 if the function has already been used. */
8354 else if (warn_missing_prototypes
8356 && old_decl
!= error_mark_node
8357 && TREE_USED (old_decl
)
8358 && !prototype_p (TREE_TYPE (old_decl
)))
8359 warning_at (loc
, OPT_Wmissing_prototypes
,
8360 "%qD was used with no prototype before its definition", decl1
);
8361 /* Optionally warn of any global def with no previous declaration. */
8362 else if (warn_missing_declarations
8363 && TREE_PUBLIC (decl1
)
8365 && !MAIN_NAME_P (DECL_NAME (decl1
))
8366 && !DECL_DECLARED_INLINE_P (decl1
))
8367 warning_at (loc
, OPT_Wmissing_declarations
,
8368 "no previous declaration for %qD",
8370 /* Optionally warn of any def with no previous declaration
8371 if the function has already been used. */
8372 else if (warn_missing_declarations
8374 && old_decl
!= error_mark_node
8375 && TREE_USED (old_decl
)
8376 && C_DECL_IMPLICIT (old_decl
))
8377 warning_at (loc
, OPT_Wmissing_declarations
,
8378 "%qD was used with no declaration before its definition", decl1
);
8380 /* This function exists in static storage.
8381 (This does not mean `static' in the C sense!) */
8382 TREE_STATIC (decl1
) = 1;
8384 /* This is the earliest point at which we might know the assembler
8385 name of the function. Thus, if it's set before this, die horribly. */
8386 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl1
));
8388 /* If #pragma weak was used, mark the decl weak now. */
8389 if (current_scope
== file_scope
)
8390 maybe_apply_pragma_weak (decl1
);
8392 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
8393 if (warn_main
&& MAIN_NAME_P (DECL_NAME (decl1
)))
8395 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1
)))
8396 != integer_type_node
)
8397 pedwarn (loc
, OPT_Wmain
, "return type of %qD is not %<int%>", decl1
);
8398 else if (TYPE_ATOMIC (TREE_TYPE (TREE_TYPE (decl1
))))
8399 pedwarn (loc
, OPT_Wmain
, "%<_Atomic%>-qualified return type of %qD",
8402 check_main_parameter_types (decl1
);
8404 if (!TREE_PUBLIC (decl1
))
8405 pedwarn (loc
, OPT_Wmain
,
8406 "%qD is normally a non-static function", decl1
);
8409 /* Record the decl so that the function name is defined.
8410 If we already have a decl for this name, and it is a FUNCTION_DECL,
8411 use the old decl. */
8413 current_function_decl
= pushdecl (decl1
);
8416 declare_parm_level ();
8418 restype
= TREE_TYPE (TREE_TYPE (current_function_decl
));
8419 resdecl
= build_decl (loc
, RESULT_DECL
, NULL_TREE
, restype
);
8420 DECL_ARTIFICIAL (resdecl
) = 1;
8421 DECL_IGNORED_P (resdecl
) = 1;
8422 DECL_RESULT (current_function_decl
) = resdecl
;
8424 start_fname_decls ();
8429 /* Subroutine of store_parm_decls which handles new-style function
8430 definitions (prototype format). The parms already have decls, so we
8431 need only record them as in effect and complain if any redundant
8432 old-style parm decls were written. */
8434 store_parm_decls_newstyle (tree fndecl
, const struct c_arg_info
*arg_info
)
8440 if (current_scope
->bindings
)
8442 error_at (DECL_SOURCE_LOCATION (fndecl
),
8443 "old-style parameter declarations in prototyped "
8444 "function definition");
8446 /* Get rid of the old-style declarations. */
8450 /* Don't issue this warning for nested functions, and don't issue this
8451 warning if we got here because ARG_INFO_TYPES was error_mark_node
8452 (this happens when a function definition has just an ellipsis in
8453 its parameter list). */
8454 else if (!in_system_header_at (input_location
)
8455 && !current_function_scope
8456 && arg_info
->types
!= error_mark_node
)
8457 warning_at (DECL_SOURCE_LOCATION (fndecl
), OPT_Wtraditional
,
8458 "traditional C rejects ISO C style function definitions");
8460 /* Now make all the parameter declarations visible in the function body.
8461 We can bypass most of the grunt work of pushdecl. */
8462 for (decl
= arg_info
->parms
; decl
; decl
= DECL_CHAIN (decl
))
8464 DECL_CONTEXT (decl
) = current_function_decl
;
8465 if (DECL_NAME (decl
))
8467 bind (DECL_NAME (decl
), decl
, current_scope
,
8468 /*invisible=*/false, /*nested=*/false,
8470 if (!TREE_USED (decl
))
8471 warn_if_shadowing (decl
);
8474 error_at (DECL_SOURCE_LOCATION (decl
), "parameter name omitted");
8477 /* Record the parameter list in the function declaration. */
8478 DECL_ARGUMENTS (fndecl
) = arg_info
->parms
;
8480 /* Now make all the ancillary declarations visible, likewise. */
8481 for (decl
= arg_info
->others
; decl
; decl
= DECL_CHAIN (decl
))
8483 DECL_CONTEXT (decl
) = current_function_decl
;
8484 if (DECL_NAME (decl
))
8485 bind (DECL_NAME (decl
), decl
, current_scope
,
8486 /*invisible=*/false,
8487 /*nested=*/(TREE_CODE (decl
) == FUNCTION_DECL
),
8491 /* And all the tag declarations. */
8492 FOR_EACH_VEC_SAFE_ELT_REVERSE (arg_info
->tags
, ix
, tag
)
8494 bind (tag
->id
, tag
->type
, current_scope
,
8495 /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION
);
8498 /* Subroutine of store_parm_decls which handles old-style function
8499 definitions (separate parameter list and declarations). */
8502 store_parm_decls_oldstyle (tree fndecl
, const struct c_arg_info
*arg_info
)
8504 struct c_binding
*b
;
8505 tree parm
, decl
, last
;
8506 tree parmids
= arg_info
->parms
;
8507 hash_set
<tree
> seen_args
;
8509 if (!in_system_header_at (input_location
))
8510 warning_at (DECL_SOURCE_LOCATION (fndecl
),
8511 OPT_Wold_style_definition
, "old-style function definition");
8513 /* Match each formal parameter name with its declaration. Save each
8514 decl in the appropriate TREE_PURPOSE slot of the parmids chain. */
8515 for (parm
= parmids
; parm
; parm
= TREE_CHAIN (parm
))
8517 if (TREE_VALUE (parm
) == 0)
8519 error_at (DECL_SOURCE_LOCATION (fndecl
),
8520 "parameter name missing from parameter list");
8521 TREE_PURPOSE (parm
) = 0;
8525 b
= I_SYMBOL_BINDING (TREE_VALUE (parm
));
8526 if (b
&& B_IN_CURRENT_SCOPE (b
))
8529 /* Skip erroneous parameters. */
8530 if (decl
== error_mark_node
)
8532 /* If we got something other than a PARM_DECL it is an error. */
8533 if (TREE_CODE (decl
) != PARM_DECL
)
8534 error_at (DECL_SOURCE_LOCATION (decl
),
8535 "%qD declared as a non-parameter", decl
);
8536 /* If the declaration is already marked, we have a duplicate
8537 name. Complain and ignore the duplicate. */
8538 else if (seen_args
.contains (decl
))
8540 error_at (DECL_SOURCE_LOCATION (decl
),
8541 "multiple parameters named %qD", decl
);
8542 TREE_PURPOSE (parm
) = 0;
8545 /* If the declaration says "void", complain and turn it into
8547 else if (VOID_TYPE_P (TREE_TYPE (decl
)))
8549 error_at (DECL_SOURCE_LOCATION (decl
),
8550 "parameter %qD declared with void type", decl
);
8551 TREE_TYPE (decl
) = integer_type_node
;
8552 DECL_ARG_TYPE (decl
) = integer_type_node
;
8553 layout_decl (decl
, 0);
8555 warn_if_shadowing (decl
);
8557 /* If no declaration found, default to int. */
8560 /* FIXME diagnostics: This should be the location of the argument,
8561 not the FNDECL. E.g., for an old-style declaration
8563 int f10(v) { blah; }
8565 We should use the location of the V, not the F10.
8566 Unfortunately, the V is an IDENTIFIER_NODE which has no
8567 location. In the future we need locations for c_arg_info
8570 See gcc.dg/Wshadow-3.c for an example of this problem. */
8571 decl
= build_decl (DECL_SOURCE_LOCATION (fndecl
),
8572 PARM_DECL
, TREE_VALUE (parm
), integer_type_node
);
8573 DECL_ARG_TYPE (decl
) = TREE_TYPE (decl
);
8575 warn_if_shadowing (decl
);
8578 pedwarn (DECL_SOURCE_LOCATION (decl
),
8579 OPT_Wimplicit_int
, "type of %qD defaults to %<int%>",
8582 warning_at (DECL_SOURCE_LOCATION (decl
),
8583 OPT_Wmissing_parameter_type
,
8584 "type of %qD defaults to %<int%>", decl
);
8587 TREE_PURPOSE (parm
) = decl
;
8588 seen_args
.add (decl
);
8591 /* Now examine the parms chain for incomplete declarations
8592 and declarations with no corresponding names. */
8594 for (b
= current_scope
->bindings
; b
; b
= b
->prev
)
8597 if (TREE_CODE (parm
) != PARM_DECL
)
8600 if (TREE_TYPE (parm
) != error_mark_node
8601 && !COMPLETE_TYPE_P (TREE_TYPE (parm
)))
8603 error_at (DECL_SOURCE_LOCATION (parm
),
8604 "parameter %qD has incomplete type", parm
);
8605 TREE_TYPE (parm
) = error_mark_node
;
8608 if (!seen_args
.contains (parm
))
8610 error_at (DECL_SOURCE_LOCATION (parm
),
8611 "declaration for parameter %qD but no such parameter",
8614 /* Pretend the parameter was not missing.
8615 This gets us to a standard state and minimizes
8616 further error messages. */
8617 parmids
= chainon (parmids
, tree_cons (parm
, 0, 0));
8621 /* Chain the declarations together in the order of the list of
8622 names. Store that chain in the function decl, replacing the
8623 list of names. Update the current scope to match. */
8624 DECL_ARGUMENTS (fndecl
) = 0;
8626 for (parm
= parmids
; parm
; parm
= TREE_CHAIN (parm
))
8627 if (TREE_PURPOSE (parm
))
8629 if (parm
&& TREE_PURPOSE (parm
))
8631 last
= TREE_PURPOSE (parm
);
8632 DECL_ARGUMENTS (fndecl
) = last
;
8634 for (parm
= TREE_CHAIN (parm
); parm
; parm
= TREE_CHAIN (parm
))
8635 if (TREE_PURPOSE (parm
))
8637 DECL_CHAIN (last
) = TREE_PURPOSE (parm
);
8638 last
= TREE_PURPOSE (parm
);
8640 DECL_CHAIN (last
) = 0;
8643 /* If there was a previous prototype,
8644 set the DECL_ARG_TYPE of each argument according to
8645 the type previously specified, and report any mismatches. */
8647 if (current_function_prototype_arg_types
)
8650 for (parm
= DECL_ARGUMENTS (fndecl
),
8651 type
= current_function_prototype_arg_types
;
8652 parm
|| (type
&& TREE_VALUE (type
) != error_mark_node
8653 && (TYPE_MAIN_VARIANT (TREE_VALUE (type
)) != void_type_node
));
8654 parm
= DECL_CHAIN (parm
), type
= TREE_CHAIN (type
))
8656 if (parm
== 0 || type
== 0
8657 || TYPE_MAIN_VARIANT (TREE_VALUE (type
)) == void_type_node
)
8659 if (current_function_prototype_built_in
)
8660 warning_at (DECL_SOURCE_LOCATION (fndecl
),
8661 0, "number of arguments doesn%'t match "
8662 "built-in prototype");
8665 /* FIXME diagnostics: This should be the location of
8666 FNDECL, but there is bug when a prototype is
8667 declared inside function context, but defined
8668 outside of it (e.g., gcc.dg/pr15698-2.c). In
8669 which case FNDECL gets the location of the
8670 prototype, not the definition. */
8671 error_at (input_location
,
8672 "number of arguments doesn%'t match prototype");
8674 error_at (current_function_prototype_locus
,
8675 "prototype declaration");
8679 /* Type for passing arg must be consistent with that
8680 declared for the arg. ISO C says we take the unqualified
8681 type for parameters declared with qualified type. */
8682 if (TREE_TYPE (parm
) != error_mark_node
8683 && TREE_TYPE (type
) != error_mark_node
8684 && ((TYPE_ATOMIC (DECL_ARG_TYPE (parm
))
8685 != TYPE_ATOMIC (TREE_VALUE (type
)))
8686 || !comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm
)),
8687 TYPE_MAIN_VARIANT (TREE_VALUE (type
)))))
8689 if ((TYPE_ATOMIC (DECL_ARG_TYPE (parm
))
8690 == TYPE_ATOMIC (TREE_VALUE (type
)))
8691 && (TYPE_MAIN_VARIANT (TREE_TYPE (parm
))
8692 == TYPE_MAIN_VARIANT (TREE_VALUE (type
))))
8694 /* Adjust argument to match prototype. E.g. a previous
8695 `int foo(float);' prototype causes
8696 `int foo(x) float x; {...}' to be treated like
8697 `int foo(float x) {...}'. This is particularly
8698 useful for argument types like uid_t. */
8699 DECL_ARG_TYPE (parm
) = TREE_TYPE (parm
);
8701 if (targetm
.calls
.promote_prototypes (TREE_TYPE (current_function_decl
))
8702 && INTEGRAL_TYPE_P (TREE_TYPE (parm
))
8703 && TYPE_PRECISION (TREE_TYPE (parm
))
8704 < TYPE_PRECISION (integer_type_node
))
8705 DECL_ARG_TYPE (parm
)
8706 = c_type_promotes_to (TREE_TYPE (parm
));
8708 /* ??? Is it possible to get here with a
8709 built-in prototype or will it always have
8710 been diagnosed as conflicting with an
8711 old-style definition and discarded? */
8712 if (current_function_prototype_built_in
)
8713 warning_at (DECL_SOURCE_LOCATION (parm
),
8714 OPT_Wpedantic
, "promoted argument %qD "
8715 "doesn%'t match built-in prototype", parm
);
8718 pedwarn (DECL_SOURCE_LOCATION (parm
),
8719 OPT_Wpedantic
, "promoted argument %qD "
8720 "doesn%'t match prototype", parm
);
8721 pedwarn (current_function_prototype_locus
, OPT_Wpedantic
,
8722 "prototype declaration");
8727 if (current_function_prototype_built_in
)
8728 warning_at (DECL_SOURCE_LOCATION (parm
),
8729 0, "argument %qD doesn%'t match "
8730 "built-in prototype", parm
);
8733 error_at (DECL_SOURCE_LOCATION (parm
),
8734 "argument %qD doesn%'t match prototype", parm
);
8735 error_at (current_function_prototype_locus
,
8736 "prototype declaration");
8741 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl
)) = 0;
8744 /* Otherwise, create a prototype that would match. */
8748 tree actual
= 0, last
= 0, type
;
8750 for (parm
= DECL_ARGUMENTS (fndecl
); parm
; parm
= DECL_CHAIN (parm
))
8752 type
= tree_cons (NULL_TREE
, DECL_ARG_TYPE (parm
), NULL_TREE
);
8754 TREE_CHAIN (last
) = type
;
8759 type
= tree_cons (NULL_TREE
, void_type_node
, NULL_TREE
);
8761 TREE_CHAIN (last
) = type
;
8765 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
8766 of the type of this function, but we need to avoid having this
8767 affect the types of other similarly-typed functions, so we must
8768 first force the generation of an identical (but separate) type
8769 node for the relevant function type. The new node we create
8770 will be a variant of the main variant of the original function
8773 TREE_TYPE (fndecl
) = build_variant_type_copy (TREE_TYPE (fndecl
));
8775 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl
)) = actual
;
8779 /* Store parameter declarations passed in ARG_INFO into the current
8780 function declaration. */
8783 store_parm_decls_from (struct c_arg_info
*arg_info
)
8785 current_function_arg_info
= arg_info
;
8786 store_parm_decls ();
8789 /* Store the parameter declarations into the current function declaration.
8790 This is called after parsing the parameter declarations, before
8791 digesting the body of the function.
8793 For an old-style definition, construct a prototype out of the old-style
8794 parameter declarations and inject it into the function's type. */
8797 store_parm_decls (void)
8799 tree fndecl
= current_function_decl
;
8802 /* The argument information block for FNDECL. */
8803 struct c_arg_info
*arg_info
= current_function_arg_info
;
8804 current_function_arg_info
= 0;
8806 /* True if this definition is written with a prototype. Note:
8807 despite C99 6.7.5.3p14, we can *not* treat an empty argument
8808 list in a function definition as equivalent to (void) -- an
8809 empty argument list specifies the function has no parameters,
8810 but only (void) sets up a prototype for future calls. */
8811 proto
= arg_info
->types
!= 0;
8814 store_parm_decls_newstyle (fndecl
, arg_info
);
8816 store_parm_decls_oldstyle (fndecl
, arg_info
);
8818 /* The next call to push_scope will be a function body. */
8820 next_is_function_body
= true;
8822 /* Write a record describing this function definition to the prototypes
8823 file (if requested). */
8825 gen_aux_info_record (fndecl
, 1, 0, proto
);
8827 /* Initialize the RTL code for the function. */
8828 allocate_struct_function (fndecl
, false);
8830 if (warn_unused_local_typedefs
)
8831 cfun
->language
= ggc_cleared_alloc
<language_function
> ();
8833 /* Begin the statement tree for this function. */
8834 DECL_SAVED_TREE (fndecl
) = push_stmt_list ();
8836 /* ??? Insert the contents of the pending sizes list into the function
8837 to be evaluated. The only reason left to have this is
8838 void foo(int n, int array[n++])
8839 because we throw away the array type in favor of a pointer type, and
8840 thus won't naturally see the SAVE_EXPR containing the increment. All
8841 other pending sizes would be handled by gimplify_parameters. */
8842 if (arg_info
->pending_sizes
)
8843 add_stmt (arg_info
->pending_sizes
);
8846 /* Store PARM_DECLs in PARMS into scope temporarily. Used for
8847 c_finish_omp_declare_simd for function prototypes. No diagnostics
8851 temp_store_parm_decls (tree fndecl
, tree parms
)
8854 for (tree p
= parms
; p
; p
= DECL_CHAIN (p
))
8856 DECL_CONTEXT (p
) = fndecl
;
8858 bind (DECL_NAME (p
), p
, current_scope
,
8859 /*invisible=*/false, /*nested=*/false,
8864 /* Undo what temp_store_parm_decls did. */
8867 temp_pop_parm_decls (void)
8869 /* Clear all bindings in this temporary scope, so that
8870 pop_scope doesn't create a BLOCK. */
8871 struct c_binding
*b
= current_scope
->bindings
;
8872 current_scope
->bindings
= NULL
;
8873 for (; b
; b
= free_binding_and_advance (b
))
8875 gcc_assert (TREE_CODE (b
->decl
) == PARM_DECL
);
8876 gcc_assert (I_SYMBOL_BINDING (b
->id
) == b
);
8877 I_SYMBOL_BINDING (b
->id
) = b
->shadowed
;
8878 if (b
->shadowed
&& b
->shadowed
->u
.type
)
8879 TREE_TYPE (b
->shadowed
->decl
) = b
->shadowed
->u
.type
;
8885 /* Finish up a function declaration and compile that function
8886 all the way to assembler language output. Then free the storage
8887 for the function definition.
8889 This is called after parsing the body of the function definition. */
8892 finish_function (void)
8894 tree fndecl
= current_function_decl
;
8896 if (c_dialect_objc ())
8897 objc_finish_function ();
8899 if (TREE_CODE (fndecl
) == FUNCTION_DECL
8900 && targetm
.calls
.promote_prototypes (TREE_TYPE (fndecl
)))
8902 tree args
= DECL_ARGUMENTS (fndecl
);
8903 for (; args
; args
= DECL_CHAIN (args
))
8905 tree type
= TREE_TYPE (args
);
8906 if (INTEGRAL_TYPE_P (type
)
8907 && TYPE_PRECISION (type
) < TYPE_PRECISION (integer_type_node
))
8908 DECL_ARG_TYPE (args
) = c_type_promotes_to (type
);
8912 if (DECL_INITIAL (fndecl
) && DECL_INITIAL (fndecl
) != error_mark_node
)
8913 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl
)) = fndecl
;
8915 /* Must mark the RESULT_DECL as being in this function. */
8917 if (DECL_RESULT (fndecl
) && DECL_RESULT (fndecl
) != error_mark_node
)
8918 DECL_CONTEXT (DECL_RESULT (fndecl
)) = fndecl
;
8920 if (MAIN_NAME_P (DECL_NAME (fndecl
)) && flag_hosted
8921 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl
)))
8922 == integer_type_node
&& flag_isoc99
)
8924 /* Hack. We don't want the middle-end to warn that this return
8925 is unreachable, so we mark its location as special. Using
8926 UNKNOWN_LOCATION has the problem that it gets clobbered in
8927 annotate_one_with_locus. A cleaner solution might be to
8928 ensure ! should_carry_locus_p (stmt), but that needs a flag.
8930 c_finish_return (BUILTINS_LOCATION
, integer_zero_node
, NULL_TREE
);
8933 /* Tie off the statement tree for this function. */
8934 DECL_SAVED_TREE (fndecl
) = pop_stmt_list (DECL_SAVED_TREE (fndecl
));
8936 /* If the function has _Cilk_spawn in front of a function call inside it
8937 i.e. it is a spawning function, then add the appropriate Cilk plus
8938 functions inside. */
8939 if (fn_contains_cilk_spawn_p (cfun
))
8940 cfun
->cilk_frame_decl
= insert_cilk_frame (fndecl
);
8942 finish_fname_decls ();
8944 /* Complain if there's just no return statement. */
8945 if (warn_return_type
8946 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl
))) != VOID_TYPE
8947 && !current_function_returns_value
&& !current_function_returns_null
8948 /* Don't complain if we are no-return. */
8949 && !current_function_returns_abnormally
8950 /* Don't complain if we are declared noreturn. */
8951 && !TREE_THIS_VOLATILE (fndecl
)
8952 /* Don't warn for main(). */
8953 && !MAIN_NAME_P (DECL_NAME (fndecl
))
8954 /* Or if they didn't actually specify a return type. */
8955 && !C_FUNCTION_IMPLICIT_INT (fndecl
)
8956 /* Normally, with -Wreturn-type, flow will complain, but we might
8957 optimize out static functions. */
8958 && !TREE_PUBLIC (fndecl
))
8960 warning (OPT_Wreturn_type
,
8961 "no return statement in function returning non-void");
8962 TREE_NO_WARNING (fndecl
) = 1;
8965 /* Complain about parameters that are only set, but never otherwise used. */
8966 if (warn_unused_but_set_parameter
)
8970 for (decl
= DECL_ARGUMENTS (fndecl
);
8972 decl
= DECL_CHAIN (decl
))
8973 if (TREE_USED (decl
)
8974 && TREE_CODE (decl
) == PARM_DECL
8975 && !DECL_READ_P (decl
)
8977 && !DECL_ARTIFICIAL (decl
)
8978 && !TREE_NO_WARNING (decl
))
8979 warning_at (DECL_SOURCE_LOCATION (decl
),
8980 OPT_Wunused_but_set_parameter
,
8981 "parameter %qD set but not used", decl
);
8984 /* Complain about locally defined typedefs that are not used in this
8986 maybe_warn_unused_local_typedefs ();
8988 /* Store the end of the function, so that we get good line number
8989 info for the epilogue. */
8990 cfun
->function_end_locus
= input_location
;
8992 /* Finalize the ELF visibility for the function. */
8993 c_determine_visibility (fndecl
);
8995 /* For GNU C extern inline functions disregard inline limits. */
8996 if (DECL_EXTERNAL (fndecl
)
8997 && DECL_DECLARED_INLINE_P (fndecl
))
8998 DECL_DISREGARD_INLINE_LIMITS (fndecl
) = 1;
9000 /* Genericize before inlining. Delay genericizing nested functions
9001 until their parent function is genericized. Since finalizing
9002 requires GENERIC, delay that as well. */
9004 if (DECL_INITIAL (fndecl
) && DECL_INITIAL (fndecl
) != error_mark_node
9005 && !undef_nested_function
)
9007 if (!decl_function_context (fndecl
))
9009 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE
, fndecl
);
9010 c_genericize (fndecl
);
9012 /* ??? Objc emits functions after finalizing the compilation unit.
9013 This should be cleaned up later and this conditional removed. */
9014 if (symtab
->global_info_ready
)
9016 cgraph_node::add_new_function (fndecl
, false);
9019 cgraph_node::finalize_function (fndecl
, false);
9023 /* Register this function with cgraph just far enough to get it
9024 added to our parent's nested function list. Handy, since the
9025 C front end doesn't have such a list. */
9026 (void) cgraph_node::get_create (fndecl
);
9030 if (!decl_function_context (fndecl
))
9031 undef_nested_function
= false;
9033 if (cfun
->language
!= NULL
)
9035 ggc_free (cfun
->language
);
9036 cfun
->language
= NULL
;
9039 /* We're leaving the context of this function, so zap cfun.
9040 It's still in DECL_STRUCT_FUNCTION, and we'll restore it in
9041 tree_rest_of_compilation. */
9043 current_function_decl
= NULL
;
9046 /* Check the declarations given in a for-loop for satisfying the C99
9047 constraints. If exactly one such decl is found, return it. LOC is
9048 the location of the opening parenthesis of the for loop. The last
9049 parameter allows you to control the "for loop initial declarations
9050 are only allowed in C99 mode". Normally, you should pass
9051 flag_isoc99 as that parameter. But in some cases (Objective-C
9052 foreach loop, for example) we want to run the checks in this
9053 function even if not in C99 mode, so we allow the caller to turn
9054 off the error about not being in C99 mode.
9058 check_for_loop_decls (location_t loc
, bool turn_off_iso_c99_error
)
9060 struct c_binding
*b
;
9061 tree one_decl
= NULL_TREE
;
9064 if (!turn_off_iso_c99_error
)
9066 static bool hint
= true;
9067 /* If we get here, declarations have been used in a for loop without
9068 the C99 for loop scope. This doesn't make much sense, so don't
9070 error_at (loc
, "%<for%> loop initial declarations "
9071 "are only allowed in C99 or C11 mode");
9075 "use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 "
9076 "to compile your code");
9081 /* C99 subclause 6.8.5 paragraph 3:
9083 [#3] The declaration part of a for statement shall only
9084 declare identifiers for objects having storage class auto or
9087 It isn't clear whether, in this sentence, "identifiers" binds to
9088 "shall only declare" or to "objects" - that is, whether all identifiers
9089 declared must be identifiers for objects, or whether the restriction
9090 only applies to those that are. (A question on this in comp.std.c
9091 in November 2000 received no answer.) We implement the strictest
9092 interpretation, to avoid creating an extension which later causes
9095 for (b
= current_scope
->bindings
; b
; b
= b
->prev
)
9098 tree decl
= b
->decl
;
9103 switch (TREE_CODE (decl
))
9107 location_t decl_loc
= DECL_SOURCE_LOCATION (decl
);
9108 if (TREE_STATIC (decl
))
9110 "declaration of static variable %qD in %<for%> loop "
9111 "initial declaration", decl
);
9112 else if (DECL_EXTERNAL (decl
))
9114 "declaration of %<extern%> variable %qD in %<for%> loop "
9115 "initial declaration", decl
);
9121 "%<struct %E%> declared in %<for%> loop initial "
9126 "%<union %E%> declared in %<for%> loop initial declaration",
9130 error_at (loc
, "%<enum %E%> declared in %<for%> loop "
9131 "initial declaration", id
);
9134 error_at (loc
, "declaration of non-variable "
9135 "%qD in %<for%> loop initial declaration", decl
);
9142 return n_decls
== 1 ? one_decl
: NULL_TREE
;
9145 /* Save and reinitialize the variables
9146 used during compilation of a C function. */
9149 c_push_function_context (void)
9151 struct language_function
*p
= cfun
->language
;
9152 /* cfun->language might have been already allocated by the use of
9153 -Wunused-local-typedefs. In that case, just re-use it. */
9155 cfun
->language
= p
= ggc_cleared_alloc
<language_function
> ();
9157 p
->base
.x_stmt_tree
= c_stmt_tree
;
9158 c_stmt_tree
.x_cur_stmt_list
= vec_safe_copy (c_stmt_tree
.x_cur_stmt_list
);
9159 p
->x_break_label
= c_break_label
;
9160 p
->x_cont_label
= c_cont_label
;
9161 p
->x_switch_stack
= c_switch_stack
;
9162 p
->arg_info
= current_function_arg_info
;
9163 p
->returns_value
= current_function_returns_value
;
9164 p
->returns_null
= current_function_returns_null
;
9165 p
->returns_abnormally
= current_function_returns_abnormally
;
9166 p
->warn_about_return_type
= warn_about_return_type
;
9168 push_function_context ();
9171 /* Restore the variables used during compilation of a C function. */
9174 c_pop_function_context (void)
9176 struct language_function
*p
;
9178 pop_function_context ();
9181 /* When -Wunused-local-typedefs is in effect, cfun->languages is
9182 used to store data throughout the life time of the current cfun,
9183 So don't deallocate it. */
9184 if (!warn_unused_local_typedefs
)
9185 cfun
->language
= NULL
;
9187 if (DECL_STRUCT_FUNCTION (current_function_decl
) == 0
9188 && DECL_SAVED_TREE (current_function_decl
) == NULL_TREE
)
9190 /* Stop pointing to the local nodes about to be freed. */
9191 /* But DECL_INITIAL must remain nonzero so we know this
9192 was an actual function definition. */
9193 DECL_INITIAL (current_function_decl
) = error_mark_node
;
9194 DECL_ARGUMENTS (current_function_decl
) = 0;
9197 c_stmt_tree
= p
->base
.x_stmt_tree
;
9198 p
->base
.x_stmt_tree
.x_cur_stmt_list
= NULL
;
9199 c_break_label
= p
->x_break_label
;
9200 c_cont_label
= p
->x_cont_label
;
9201 c_switch_stack
= p
->x_switch_stack
;
9202 current_function_arg_info
= p
->arg_info
;
9203 current_function_returns_value
= p
->returns_value
;
9204 current_function_returns_null
= p
->returns_null
;
9205 current_function_returns_abnormally
= p
->returns_abnormally
;
9206 warn_about_return_type
= p
->warn_about_return_type
;
9209 /* The functions below are required for functionality of doing
9210 function at once processing in the C front end. Currently these
9211 functions are not called from anywhere in the C front end, but as
9212 these changes continue, that will change. */
9214 /* Returns the stmt_tree (if any) to which statements are currently
9215 being added. If there is no active statement-tree, NULL is
9219 current_stmt_tree (void)
9221 return &c_stmt_tree
;
9224 /* Return the global value of T as a symbol. */
9227 identifier_global_value (tree t
)
9229 struct c_binding
*b
;
9231 for (b
= I_SYMBOL_BINDING (t
); b
; b
= b
->shadowed
)
9232 if (B_IN_FILE_SCOPE (b
) || B_IN_EXTERNAL_SCOPE (b
))
9238 /* In C, the only C-linkage public declaration is at file scope. */
9241 c_linkage_bindings (tree name
)
9243 return identifier_global_value (name
);
9246 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
9247 otherwise the name is found in ridpointers from RID_INDEX. */
9250 record_builtin_type (enum rid rid_index
, const char *name
, tree type
)
9254 id
= ridpointers
[(int) rid_index
];
9256 id
= get_identifier (name
);
9257 decl
= build_decl (UNKNOWN_LOCATION
, TYPE_DECL
, id
, type
);
9259 if (debug_hooks
->type_decl
)
9260 debug_hooks
->type_decl (decl
, false);
9263 /* Build the void_list_node (void_type_node having been created). */
9265 build_void_list_node (void)
9267 tree t
= build_tree_list (NULL_TREE
, void_type_node
);
9271 /* Return a c_parm structure with the given SPECS, ATTRS and DECLARATOR. */
9274 build_c_parm (struct c_declspecs
*specs
, tree attrs
,
9275 struct c_declarator
*declarator
)
9277 struct c_parm
*ret
= XOBNEW (&parser_obstack
, struct c_parm
);
9280 ret
->declarator
= declarator
;
9284 /* Return a declarator with nested attributes. TARGET is the inner
9285 declarator to which these attributes apply. ATTRS are the
9288 struct c_declarator
*
9289 build_attrs_declarator (tree attrs
, struct c_declarator
*target
)
9291 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
9292 ret
->kind
= cdk_attrs
;
9293 ret
->declarator
= target
;
9294 ret
->u
.attrs
= attrs
;
9298 /* Return a declarator for a function with arguments specified by ARGS
9299 and return type specified by TARGET. */
9301 struct c_declarator
*
9302 build_function_declarator (struct c_arg_info
*args
,
9303 struct c_declarator
*target
)
9305 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
9306 ret
->kind
= cdk_function
;
9307 ret
->declarator
= target
;
9308 ret
->u
.arg_info
= args
;
9312 /* Return a declarator for the identifier IDENT (which may be
9313 NULL_TREE for an abstract declarator). */
9315 struct c_declarator
*
9316 build_id_declarator (tree ident
)
9318 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
9320 ret
->declarator
= 0;
9322 /* Default value - may get reset to a more precise location. */
9323 ret
->id_loc
= input_location
;
9327 /* Return something to represent absolute declarators containing a *.
9328 TARGET is the absolute declarator that the * contains.
9329 TYPE_QUALS_ATTRS is a structure for type qualifiers and attributes
9330 to apply to the pointer type. */
9332 struct c_declarator
*
9333 make_pointer_declarator (struct c_declspecs
*type_quals_attrs
,
9334 struct c_declarator
*target
)
9338 struct c_declarator
*itarget
= target
;
9339 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
9340 if (type_quals_attrs
)
9342 attrs
= type_quals_attrs
->attrs
;
9343 quals
= quals_from_declspecs (type_quals_attrs
);
9344 if (attrs
!= NULL_TREE
)
9345 itarget
= build_attrs_declarator (attrs
, target
);
9347 ret
->kind
= cdk_pointer
;
9348 ret
->declarator
= itarget
;
9349 ret
->u
.pointer_quals
= quals
;
9353 /* Return a pointer to a structure for an empty list of declaration
9356 struct c_declspecs
*
9357 build_null_declspecs (void)
9359 struct c_declspecs
*ret
= XOBNEW (&parser_obstack
, struct c_declspecs
);
9360 memset (&ret
->locations
, 0, cdw_number_of_elements
);
9365 ret
->align_log
= -1;
9366 ret
->typespec_word
= cts_none
;
9367 ret
->storage_class
= csc_none
;
9368 ret
->expr_const_operands
= true;
9369 ret
->declspecs_seen_p
= false;
9370 ret
->typespec_kind
= ctsk_none
;
9371 ret
->non_sc_seen_p
= false;
9372 ret
->typedef_p
= false;
9373 ret
->explicit_signed_p
= false;
9374 ret
->deprecated_p
= false;
9375 ret
->default_int_p
= false;
9376 ret
->long_p
= false;
9377 ret
->long_long_p
= false;
9378 ret
->short_p
= false;
9379 ret
->signed_p
= false;
9380 ret
->unsigned_p
= false;
9381 ret
->complex_p
= false;
9382 ret
->inline_p
= false;
9383 ret
->noreturn_p
= false;
9384 ret
->thread_p
= false;
9385 ret
->thread_gnu_p
= false;
9386 ret
->const_p
= false;
9387 ret
->volatile_p
= false;
9388 ret
->atomic_p
= false;
9389 ret
->restrict_p
= false;
9390 ret
->saturating_p
= false;
9391 ret
->alignas_p
= false;
9392 ret
->address_space
= ADDR_SPACE_GENERIC
;
9396 /* Add the address space ADDRSPACE to the declaration specifiers
9397 SPECS, returning SPECS. */
9399 struct c_declspecs
*
9400 declspecs_add_addrspace (source_location location
,
9401 struct c_declspecs
*specs
, addr_space_t as
)
9403 specs
->non_sc_seen_p
= true;
9404 specs
->declspecs_seen_p
= true;
9406 if (!ADDR_SPACE_GENERIC_P (specs
->address_space
)
9407 && specs
->address_space
!= as
)
9408 error ("incompatible address space qualifiers %qs and %qs",
9409 c_addr_space_name (as
),
9410 c_addr_space_name (specs
->address_space
));
9413 specs
->address_space
= as
;
9414 specs
->locations
[cdw_address_space
] = location
;
9419 /* Add the type qualifier QUAL to the declaration specifiers SPECS,
9422 struct c_declspecs
*
9423 declspecs_add_qual (source_location loc
,
9424 struct c_declspecs
*specs
, tree qual
)
9428 specs
->non_sc_seen_p
= true;
9429 specs
->declspecs_seen_p
= true;
9430 gcc_assert (TREE_CODE (qual
) == IDENTIFIER_NODE
9431 && C_IS_RESERVED_WORD (qual
));
9432 i
= C_RID_CODE (qual
);
9436 dupe
= specs
->const_p
;
9437 specs
->const_p
= true;
9438 specs
->locations
[cdw_const
] = loc
;
9441 dupe
= specs
->volatile_p
;
9442 specs
->volatile_p
= true;
9443 specs
->locations
[cdw_volatile
] = loc
;
9446 dupe
= specs
->restrict_p
;
9447 specs
->restrict_p
= true;
9448 specs
->locations
[cdw_restrict
] = loc
;
9451 dupe
= specs
->atomic_p
;
9452 specs
->atomic_p
= true;
9458 pedwarn_c90 (loc
, OPT_Wpedantic
, "duplicate %qE", qual
);
9462 /* Add the type specifier TYPE to the declaration specifiers SPECS,
9465 struct c_declspecs
*
9466 declspecs_add_type (location_t loc
, struct c_declspecs
*specs
,
9467 struct c_typespec spec
)
9469 tree type
= spec
.spec
;
9470 specs
->non_sc_seen_p
= true;
9471 specs
->declspecs_seen_p
= true;
9472 specs
->typespec_kind
= spec
.kind
;
9473 if (TREE_DEPRECATED (type
))
9474 specs
->deprecated_p
= true;
9476 /* Handle type specifier keywords. */
9477 if (TREE_CODE (type
) == IDENTIFIER_NODE
9478 && C_IS_RESERVED_WORD (type
)
9479 && C_RID_CODE (type
) != RID_CXX_COMPAT_WARN
)
9481 enum rid i
= C_RID_CODE (type
);
9484 error_at (loc
, "two or more data types in declaration specifiers");
9487 if ((int) i
<= (int) RID_LAST_MODIFIER
)
9489 /* "long", "short", "signed", "unsigned", "_Complex" or "_Sat". */
9494 if (specs
->long_long_p
)
9496 error_at (loc
, "%<long long long%> is too long for GCC");
9501 if (specs
->typespec_word
== cts_double
)
9504 ("both %<long long%> and %<double%> in "
9505 "declaration specifiers"));
9508 pedwarn_c90 (loc
, OPT_Wlong_long
,
9509 "ISO C90 does not support %<long long%>");
9510 specs
->long_long_p
= 1;
9511 specs
->locations
[cdw_long_long
] = loc
;
9516 ("both %<long%> and %<short%> in "
9517 "declaration specifiers"));
9518 else if (specs
->typespec_word
== cts_auto_type
)
9520 ("both %<long%> and %<__auto_type%> in "
9521 "declaration specifiers"));
9522 else if (specs
->typespec_word
== cts_void
)
9524 ("both %<long%> and %<void%> in "
9525 "declaration specifiers"));
9526 else if (specs
->typespec_word
== cts_int_n
)
9528 ("both %<long%> and %<__int%d%> in "
9529 "declaration specifiers"),
9530 int_n_data
[specs
->int_n_idx
].bitsize
);
9531 else if (specs
->typespec_word
== cts_bool
)
9533 ("both %<long%> and %<_Bool%> in "
9534 "declaration specifiers"));
9535 else if (specs
->typespec_word
== cts_char
)
9537 ("both %<long%> and %<char%> in "
9538 "declaration specifiers"));
9539 else if (specs
->typespec_word
== cts_float
)
9541 ("both %<long%> and %<float%> in "
9542 "declaration specifiers"));
9543 else if (specs
->typespec_word
== cts_dfloat32
)
9545 ("both %<long%> and %<_Decimal32%> in "
9546 "declaration specifiers"));
9547 else if (specs
->typespec_word
== cts_dfloat64
)
9549 ("both %<long%> and %<_Decimal64%> in "
9550 "declaration specifiers"));
9551 else if (specs
->typespec_word
== cts_dfloat128
)
9553 ("both %<long%> and %<_Decimal128%> in "
9554 "declaration specifiers"));
9557 specs
->long_p
= true;
9558 specs
->locations
[cdw_long
] = loc
;
9562 dupe
= specs
->short_p
;
9565 ("both %<long%> and %<short%> in "
9566 "declaration specifiers"));
9567 else if (specs
->typespec_word
== cts_auto_type
)
9569 ("both %<short%> and %<__auto_type%> in "
9570 "declaration specifiers"));
9571 else if (specs
->typespec_word
== cts_void
)
9573 ("both %<short%> and %<void%> in "
9574 "declaration specifiers"));
9575 else if (specs
->typespec_word
== cts_int_n
)
9577 ("both %<short%> and %<__int%d%> in "
9578 "declaration specifiers"),
9579 int_n_data
[specs
->int_n_idx
].bitsize
);
9580 else if (specs
->typespec_word
== cts_bool
)
9582 ("both %<short%> and %<_Bool%> in "
9583 "declaration specifiers"));
9584 else if (specs
->typespec_word
== cts_char
)
9586 ("both %<short%> and %<char%> in "
9587 "declaration specifiers"));
9588 else if (specs
->typespec_word
== cts_float
)
9590 ("both %<short%> and %<float%> in "
9591 "declaration specifiers"));
9592 else if (specs
->typespec_word
== cts_double
)
9594 ("both %<short%> and %<double%> in "
9595 "declaration specifiers"));
9596 else if (specs
->typespec_word
== cts_dfloat32
)
9598 ("both %<short%> and %<_Decimal32%> in "
9599 "declaration specifiers"));
9600 else if (specs
->typespec_word
== cts_dfloat64
)
9602 ("both %<short%> and %<_Decimal64%> in "
9603 "declaration specifiers"));
9604 else if (specs
->typespec_word
== cts_dfloat128
)
9606 ("both %<short%> and %<_Decimal128%> in "
9607 "declaration specifiers"));
9610 specs
->short_p
= true;
9611 specs
->locations
[cdw_short
] = loc
;
9615 dupe
= specs
->signed_p
;
9616 if (specs
->unsigned_p
)
9618 ("both %<signed%> and %<unsigned%> in "
9619 "declaration specifiers"));
9620 else if (specs
->typespec_word
== cts_auto_type
)
9622 ("both %<signed%> and %<__auto_type%> in "
9623 "declaration specifiers"));
9624 else if (specs
->typespec_word
== cts_void
)
9626 ("both %<signed%> and %<void%> in "
9627 "declaration specifiers"));
9628 else if (specs
->typespec_word
== cts_bool
)
9630 ("both %<signed%> and %<_Bool%> in "
9631 "declaration specifiers"));
9632 else if (specs
->typespec_word
== cts_float
)
9634 ("both %<signed%> and %<float%> in "
9635 "declaration specifiers"));
9636 else if (specs
->typespec_word
== cts_double
)
9638 ("both %<signed%> and %<double%> in "
9639 "declaration specifiers"));
9640 else if (specs
->typespec_word
== cts_dfloat32
)
9642 ("both %<signed%> and %<_Decimal32%> in "
9643 "declaration specifiers"));
9644 else if (specs
->typespec_word
== cts_dfloat64
)
9646 ("both %<signed%> and %<_Decimal64%> in "
9647 "declaration specifiers"));
9648 else if (specs
->typespec_word
== cts_dfloat128
)
9650 ("both %<signed%> and %<_Decimal128%> in "
9651 "declaration specifiers"));
9654 specs
->signed_p
= true;
9655 specs
->locations
[cdw_signed
] = loc
;
9659 dupe
= specs
->unsigned_p
;
9660 if (specs
->signed_p
)
9662 ("both %<signed%> and %<unsigned%> in "
9663 "declaration specifiers"));
9664 else if (specs
->typespec_word
== cts_auto_type
)
9666 ("both %<unsigned%> and %<__auto_type%> in "
9667 "declaration specifiers"));
9668 else if (specs
->typespec_word
== cts_void
)
9670 ("both %<unsigned%> and %<void%> in "
9671 "declaration specifiers"));
9672 else if (specs
->typespec_word
== cts_bool
)
9674 ("both %<unsigned%> and %<_Bool%> in "
9675 "declaration specifiers"));
9676 else if (specs
->typespec_word
== cts_float
)
9678 ("both %<unsigned%> and %<float%> in "
9679 "declaration specifiers"));
9680 else if (specs
->typespec_word
== cts_double
)
9682 ("both %<unsigned%> and %<double%> in "
9683 "declaration specifiers"));
9684 else if (specs
->typespec_word
== cts_dfloat32
)
9686 ("both %<unsigned%> and %<_Decimal32%> in "
9687 "declaration specifiers"));
9688 else if (specs
->typespec_word
== cts_dfloat64
)
9690 ("both %<unsigned%> and %<_Decimal64%> in "
9691 "declaration specifiers"));
9692 else if (specs
->typespec_word
== cts_dfloat128
)
9694 ("both %<unsigned%> and %<_Decimal128%> in "
9695 "declaration specifiers"));
9698 specs
->unsigned_p
= true;
9699 specs
->locations
[cdw_unsigned
] = loc
;
9703 dupe
= specs
->complex_p
;
9704 if (!in_system_header_at (loc
))
9705 pedwarn_c90 (loc
, OPT_Wpedantic
,
9706 "ISO C90 does not support complex types");
9707 if (specs
->typespec_word
== cts_auto_type
)
9709 ("both %<complex%> and %<__auto_type%> in "
9710 "declaration specifiers"));
9711 else if (specs
->typespec_word
== cts_void
)
9713 ("both %<complex%> and %<void%> in "
9714 "declaration specifiers"));
9715 else if (specs
->typespec_word
== cts_bool
)
9717 ("both %<complex%> and %<_Bool%> in "
9718 "declaration specifiers"));
9719 else if (specs
->typespec_word
== cts_dfloat32
)
9721 ("both %<complex%> and %<_Decimal32%> in "
9722 "declaration specifiers"));
9723 else if (specs
->typespec_word
== cts_dfloat64
)
9725 ("both %<complex%> and %<_Decimal64%> in "
9726 "declaration specifiers"));
9727 else if (specs
->typespec_word
== cts_dfloat128
)
9729 ("both %<complex%> and %<_Decimal128%> in "
9730 "declaration specifiers"));
9731 else if (specs
->typespec_word
== cts_fract
)
9733 ("both %<complex%> and %<_Fract%> in "
9734 "declaration specifiers"));
9735 else if (specs
->typespec_word
== cts_accum
)
9737 ("both %<complex%> and %<_Accum%> in "
9738 "declaration specifiers"));
9739 else if (specs
->saturating_p
)
9741 ("both %<complex%> and %<_Sat%> in "
9742 "declaration specifiers"));
9745 specs
->complex_p
= true;
9746 specs
->locations
[cdw_complex
] = loc
;
9750 dupe
= specs
->saturating_p
;
9751 pedwarn (loc
, OPT_Wpedantic
,
9752 "ISO C does not support saturating types");
9753 if (specs
->typespec_word
== cts_int_n
)
9756 ("both %<_Sat%> and %<__int%d%> in "
9757 "declaration specifiers"),
9758 int_n_data
[specs
->int_n_idx
].bitsize
);
9760 else if (specs
->typespec_word
== cts_auto_type
)
9762 ("both %<_Sat%> and %<__auto_type%> in "
9763 "declaration specifiers"));
9764 else if (specs
->typespec_word
== cts_void
)
9766 ("both %<_Sat%> and %<void%> in "
9767 "declaration specifiers"));
9768 else if (specs
->typespec_word
== cts_bool
)
9770 ("both %<_Sat%> and %<_Bool%> in "
9771 "declaration specifiers"));
9772 else if (specs
->typespec_word
== cts_char
)
9774 ("both %<_Sat%> and %<char%> in "
9775 "declaration specifiers"));
9776 else if (specs
->typespec_word
== cts_int
)
9778 ("both %<_Sat%> and %<int%> in "
9779 "declaration specifiers"));
9780 else if (specs
->typespec_word
== cts_float
)
9782 ("both %<_Sat%> and %<float%> in "
9783 "declaration specifiers"));
9784 else if (specs
->typespec_word
== cts_double
)
9786 ("both %<_Sat%> and %<double%> in "
9787 "declaration specifiers"));
9788 else if (specs
->typespec_word
== cts_dfloat32
)
9790 ("both %<_Sat%> and %<_Decimal32%> in "
9791 "declaration specifiers"));
9792 else if (specs
->typespec_word
== cts_dfloat64
)
9794 ("both %<_Sat%> and %<_Decimal64%> in "
9795 "declaration specifiers"));
9796 else if (specs
->typespec_word
== cts_dfloat128
)
9798 ("both %<_Sat%> and %<_Decimal128%> in "
9799 "declaration specifiers"));
9800 else if (specs
->complex_p
)
9802 ("both %<_Sat%> and %<complex%> in "
9803 "declaration specifiers"));
9806 specs
->saturating_p
= true;
9807 specs
->locations
[cdw_saturating
] = loc
;
9815 error_at (loc
, "duplicate %qE", type
);
9821 /* "void", "_Bool", "char", "int", "float", "double", "_Decimal32",
9822 "__intN", "_Decimal64", "_Decimal128", "_Fract", "_Accum" or
9824 if (specs
->typespec_word
!= cts_none
)
9827 "two or more data types in declaration specifiers");
9835 ("both %<long%> and %<__auto_type%> in "
9836 "declaration specifiers"));
9837 else if (specs
->short_p
)
9839 ("both %<short%> and %<__auto_type%> in "
9840 "declaration specifiers"));
9841 else if (specs
->signed_p
)
9843 ("both %<signed%> and %<__auto_type%> in "
9844 "declaration specifiers"));
9845 else if (specs
->unsigned_p
)
9847 ("both %<unsigned%> and %<__auto_type%> in "
9848 "declaration specifiers"));
9849 else if (specs
->complex_p
)
9851 ("both %<complex%> and %<__auto_type%> in "
9852 "declaration specifiers"));
9853 else if (specs
->saturating_p
)
9855 ("both %<_Sat%> and %<__auto_type%> in "
9856 "declaration specifiers"));
9859 specs
->typespec_word
= cts_auto_type
;
9860 specs
->locations
[cdw_typespec
] = loc
;
9867 specs
->int_n_idx
= i
- RID_INT_N_0
;
9868 if (!in_system_header_at (input_location
))
9869 pedwarn (loc
, OPT_Wpedantic
,
9870 "ISO C does not support %<__int%d%> types",
9871 int_n_data
[specs
->int_n_idx
].bitsize
);
9875 ("both %<__int%d%> and %<long%> in "
9876 "declaration specifiers"),
9877 int_n_data
[specs
->int_n_idx
].bitsize
);
9878 else if (specs
->saturating_p
)
9880 ("both %<_Sat%> and %<__int%d%> in "
9881 "declaration specifiers"),
9882 int_n_data
[specs
->int_n_idx
].bitsize
);
9883 else if (specs
->short_p
)
9885 ("both %<__int%d%> and %<short%> in "
9886 "declaration specifiers"),
9887 int_n_data
[specs
->int_n_idx
].bitsize
);
9888 else if (! int_n_enabled_p
[specs
->int_n_idx
])
9890 "%<__int%d%> is not supported on this target",
9891 int_n_data
[specs
->int_n_idx
].bitsize
);
9894 specs
->typespec_word
= cts_int_n
;
9895 specs
->locations
[cdw_typespec
] = loc
;
9901 ("both %<long%> and %<void%> in "
9902 "declaration specifiers"));
9903 else if (specs
->short_p
)
9905 ("both %<short%> and %<void%> in "
9906 "declaration specifiers"));
9907 else if (specs
->signed_p
)
9909 ("both %<signed%> and %<void%> in "
9910 "declaration specifiers"));
9911 else if (specs
->unsigned_p
)
9913 ("both %<unsigned%> and %<void%> in "
9914 "declaration specifiers"));
9915 else if (specs
->complex_p
)
9917 ("both %<complex%> and %<void%> in "
9918 "declaration specifiers"));
9919 else if (specs
->saturating_p
)
9921 ("both %<_Sat%> and %<void%> in "
9922 "declaration specifiers"));
9925 specs
->typespec_word
= cts_void
;
9926 specs
->locations
[cdw_typespec
] = loc
;
9930 if (!in_system_header_at (loc
))
9931 pedwarn_c90 (loc
, OPT_Wpedantic
,
9932 "ISO C90 does not support boolean types");
9935 ("both %<long%> and %<_Bool%> in "
9936 "declaration specifiers"));
9937 else if (specs
->short_p
)
9939 ("both %<short%> and %<_Bool%> in "
9940 "declaration specifiers"));
9941 else if (specs
->signed_p
)
9943 ("both %<signed%> and %<_Bool%> in "
9944 "declaration specifiers"));
9945 else if (specs
->unsigned_p
)
9947 ("both %<unsigned%> and %<_Bool%> in "
9948 "declaration specifiers"));
9949 else if (specs
->complex_p
)
9951 ("both %<complex%> and %<_Bool%> in "
9952 "declaration specifiers"));
9953 else if (specs
->saturating_p
)
9955 ("both %<_Sat%> and %<_Bool%> in "
9956 "declaration specifiers"));
9959 specs
->typespec_word
= cts_bool
;
9960 specs
->locations
[cdw_typespec
] = loc
;
9966 ("both %<long%> and %<char%> in "
9967 "declaration specifiers"));
9968 else if (specs
->short_p
)
9970 ("both %<short%> and %<char%> in "
9971 "declaration specifiers"));
9972 else if (specs
->saturating_p
)
9974 ("both %<_Sat%> and %<char%> in "
9975 "declaration specifiers"));
9978 specs
->typespec_word
= cts_char
;
9979 specs
->locations
[cdw_typespec
] = loc
;
9983 if (specs
->saturating_p
)
9985 ("both %<_Sat%> and %<int%> in "
9986 "declaration specifiers"));
9989 specs
->typespec_word
= cts_int
;
9990 specs
->locations
[cdw_typespec
] = loc
;
9996 ("both %<long%> and %<float%> in "
9997 "declaration specifiers"));
9998 else if (specs
->short_p
)
10000 ("both %<short%> and %<float%> in "
10001 "declaration specifiers"));
10002 else if (specs
->signed_p
)
10004 ("both %<signed%> and %<float%> in "
10005 "declaration specifiers"));
10006 else if (specs
->unsigned_p
)
10008 ("both %<unsigned%> and %<float%> in "
10009 "declaration specifiers"));
10010 else if (specs
->saturating_p
)
10012 ("both %<_Sat%> and %<float%> in "
10013 "declaration specifiers"));
10016 specs
->typespec_word
= cts_float
;
10017 specs
->locations
[cdw_typespec
] = loc
;
10021 if (specs
->long_long_p
)
10023 ("both %<long long%> and %<double%> in "
10024 "declaration specifiers"));
10025 else if (specs
->short_p
)
10027 ("both %<short%> and %<double%> in "
10028 "declaration specifiers"));
10029 else if (specs
->signed_p
)
10031 ("both %<signed%> and %<double%> in "
10032 "declaration specifiers"));
10033 else if (specs
->unsigned_p
)
10035 ("both %<unsigned%> and %<double%> in "
10036 "declaration specifiers"));
10037 else if (specs
->saturating_p
)
10039 ("both %<_Sat%> and %<double%> in "
10040 "declaration specifiers"));
10043 specs
->typespec_word
= cts_double
;
10044 specs
->locations
[cdw_typespec
] = loc
;
10049 case RID_DFLOAT128
:
10052 if (i
== RID_DFLOAT32
)
10053 str
= "_Decimal32";
10054 else if (i
== RID_DFLOAT64
)
10055 str
= "_Decimal64";
10057 str
= "_Decimal128";
10058 if (specs
->long_long_p
)
10060 ("both %<long long%> and %<%s%> in "
10061 "declaration specifiers"),
10065 ("both %<long%> and %<%s%> in "
10066 "declaration specifiers"),
10068 else if (specs
->short_p
)
10070 ("both %<short%> and %<%s%> in "
10071 "declaration specifiers"),
10073 else if (specs
->signed_p
)
10075 ("both %<signed%> and %<%s%> in "
10076 "declaration specifiers"),
10078 else if (specs
->unsigned_p
)
10080 ("both %<unsigned%> and %<%s%> in "
10081 "declaration specifiers"),
10083 else if (specs
->complex_p
)
10085 ("both %<complex%> and %<%s%> in "
10086 "declaration specifiers"),
10088 else if (specs
->saturating_p
)
10090 ("both %<_Sat%> and %<%s%> in "
10091 "declaration specifiers"),
10093 else if (i
== RID_DFLOAT32
)
10094 specs
->typespec_word
= cts_dfloat32
;
10095 else if (i
== RID_DFLOAT64
)
10096 specs
->typespec_word
= cts_dfloat64
;
10098 specs
->typespec_word
= cts_dfloat128
;
10099 specs
->locations
[cdw_typespec
] = loc
;
10101 if (!targetm
.decimal_float_supported_p ())
10103 ("decimal floating point not supported "
10104 "for this target"));
10105 pedwarn (loc
, OPT_Wpedantic
,
10106 "ISO C does not support decimal floating point");
10112 if (i
== RID_FRACT
)
10116 if (specs
->complex_p
)
10118 ("both %<complex%> and %<%s%> in "
10119 "declaration specifiers"),
10121 else if (i
== RID_FRACT
)
10122 specs
->typespec_word
= cts_fract
;
10124 specs
->typespec_word
= cts_accum
;
10125 specs
->locations
[cdw_typespec
] = loc
;
10127 if (!targetm
.fixed_point_supported_p ())
10129 "fixed-point types not supported for this target");
10130 pedwarn (loc
, OPT_Wpedantic
,
10131 "ISO C does not support fixed-point types");
10134 /* ObjC reserved word "id", handled below. */
10140 /* Now we have a typedef (a TYPE_DECL node), an identifier (some
10141 form of ObjC type, cases such as "int" and "long" being handled
10142 above), a TYPE (struct, union, enum and typeof specifiers) or an
10143 ERROR_MARK. In none of these cases may there have previously
10144 been any type specifiers. */
10145 if (specs
->type
|| specs
->typespec_word
!= cts_none
10146 || specs
->long_p
|| specs
->short_p
|| specs
->signed_p
10147 || specs
->unsigned_p
|| specs
->complex_p
)
10148 error_at (loc
, "two or more data types in declaration specifiers");
10149 else if (TREE_CODE (type
) == TYPE_DECL
)
10151 if (TREE_TYPE (type
) == error_mark_node
)
10152 ; /* Allow the type to default to int to avoid cascading errors. */
10155 specs
->type
= TREE_TYPE (type
);
10156 specs
->decl_attr
= DECL_ATTRIBUTES (type
);
10157 specs
->typedef_p
= true;
10158 specs
->explicit_signed_p
= C_TYPEDEF_EXPLICITLY_SIGNED (type
);
10159 specs
->locations
[cdw_typedef
] = loc
;
10161 /* If this typedef name is defined in a struct, then a C++
10162 lookup would return a different value. */
10163 if (warn_cxx_compat
10164 && I_SYMBOL_BINDING (DECL_NAME (type
))->in_struct
)
10165 warning_at (loc
, OPT_Wc___compat
,
10166 "C++ lookup of %qD would return a field, not a type",
10169 /* If we are parsing a struct, record that a struct field
10171 if (warn_cxx_compat
&& struct_parse_info
!= NULL
)
10172 struct_parse_info
->typedefs_seen
.safe_push (type
);
10175 else if (TREE_CODE (type
) == IDENTIFIER_NODE
)
10177 tree t
= lookup_name (type
);
10178 if (!t
|| TREE_CODE (t
) != TYPE_DECL
)
10179 error_at (loc
, "%qE fails to be a typedef or built in type", type
);
10180 else if (TREE_TYPE (t
) == error_mark_node
)
10184 specs
->type
= TREE_TYPE (t
);
10185 specs
->locations
[cdw_typespec
] = loc
;
10190 if (TREE_CODE (type
) != ERROR_MARK
&& spec
.kind
== ctsk_typeof
)
10192 specs
->typedef_p
= true;
10193 specs
->locations
[cdw_typedef
] = loc
;
10197 specs
->expr
= build2 (COMPOUND_EXPR
, TREE_TYPE (spec
.expr
),
10198 specs
->expr
, spec
.expr
);
10200 specs
->expr
= spec
.expr
;
10201 specs
->expr_const_operands
&= spec
.expr_const_operands
;
10204 specs
->type
= type
;
10210 /* Add the storage class specifier or function specifier SCSPEC to the
10211 declaration specifiers SPECS, returning SPECS. */
10213 struct c_declspecs
*
10214 declspecs_add_scspec (source_location loc
,
10215 struct c_declspecs
*specs
,
10219 enum c_storage_class n
= csc_none
;
10221 specs
->declspecs_seen_p
= true;
10222 gcc_assert (TREE_CODE (scspec
) == IDENTIFIER_NODE
10223 && C_IS_RESERVED_WORD (scspec
));
10224 i
= C_RID_CODE (scspec
);
10225 if (specs
->non_sc_seen_p
)
10226 warning (OPT_Wold_style_declaration
,
10227 "%qE is not at beginning of declaration", scspec
);
10231 /* C99 permits duplicate inline. Although of doubtful utility,
10232 it seems simplest to permit it in gnu89 mode as well, as
10233 there is also little utility in maintaining this as a
10234 difference between gnu89 and C99 inline. */
10236 specs
->inline_p
= true;
10237 specs
->locations
[cdw_inline
] = loc
;
10240 /* Duplicate _Noreturn is permitted. */
10242 specs
->noreturn_p
= true;
10243 specs
->locations
[cdw_noreturn
] = loc
;
10246 dupe
= specs
->thread_p
;
10247 if (specs
->storage_class
== csc_auto
)
10248 error ("%qE used with %<auto%>", scspec
);
10249 else if (specs
->storage_class
== csc_register
)
10250 error ("%qE used with %<register%>", scspec
);
10251 else if (specs
->storage_class
== csc_typedef
)
10252 error ("%qE used with %<typedef%>", scspec
);
10255 specs
->thread_p
= true;
10256 specs
->thread_gnu_p
= (strcmp (IDENTIFIER_POINTER (scspec
),
10258 /* A diagnostic is not required for the use of this
10259 identifier in the implementation namespace; only diagnose
10260 it for the C11 spelling because of existing code using
10261 the other spelling. */
10262 if (!specs
->thread_gnu_p
)
10265 pedwarn_c99 (loc
, OPT_Wpedantic
,
10266 "ISO C99 does not support %qE", scspec
);
10268 pedwarn_c99 (loc
, OPT_Wpedantic
,
10269 "ISO C90 does not support %qE", scspec
);
10271 specs
->locations
[cdw_thread
] = loc
;
10279 /* Diagnose "__thread extern". */
10280 if (specs
->thread_p
&& specs
->thread_gnu_p
)
10281 error ("%<__thread%> before %<extern%>");
10288 /* Diagnose "__thread static". */
10289 if (specs
->thread_p
&& specs
->thread_gnu_p
)
10290 error ("%<__thread%> before %<static%>");
10296 gcc_unreachable ();
10298 if (n
!= csc_none
&& n
== specs
->storage_class
)
10302 if (i
== RID_THREAD
)
10303 error ("duplicate %<_Thread_local%> or %<__thread%>");
10305 error ("duplicate %qE", scspec
);
10309 if (specs
->storage_class
!= csc_none
&& n
!= specs
->storage_class
)
10311 error ("multiple storage classes in declaration specifiers");
10315 specs
->storage_class
= n
;
10316 specs
->locations
[cdw_storage_class
] = loc
;
10317 if (n
!= csc_extern
&& n
!= csc_static
&& specs
->thread_p
)
10319 error ("%qs used with %qE",
10320 specs
->thread_gnu_p
? "__thread" : "_Thread_local",
10322 specs
->thread_p
= false;
10329 /* Add the attributes ATTRS to the declaration specifiers SPECS,
10330 returning SPECS. */
10332 struct c_declspecs
*
10333 declspecs_add_attrs (source_location loc
, struct c_declspecs
*specs
, tree attrs
)
10335 specs
->attrs
= chainon (attrs
, specs
->attrs
);
10336 specs
->locations
[cdw_attributes
] = loc
;
10337 specs
->declspecs_seen_p
= true;
10341 /* Add an _Alignas specifier (expression ALIGN, or type whose
10342 alignment is ALIGN) to the declaration specifiers SPECS, returning
10344 struct c_declspecs
*
10345 declspecs_add_alignas (source_location loc
,
10346 struct c_declspecs
*specs
, tree align
)
10349 specs
->alignas_p
= true;
10350 specs
->locations
[cdw_alignas
] = loc
;
10351 if (align
== error_mark_node
)
10353 align_log
= check_user_alignment (align
, true);
10354 if (align_log
> specs
->align_log
)
10355 specs
->align_log
= align_log
;
10359 /* Combine "long", "short", "signed", "unsigned" and "_Complex" type
10360 specifiers with any other type specifier to determine the resulting
10361 type. This is where ISO C checks on complex types are made, since
10362 "_Complex long" is a prefix of the valid ISO C type "_Complex long
10365 struct c_declspecs
*
10366 finish_declspecs (struct c_declspecs
*specs
)
10368 /* If a type was specified as a whole, we have no modifiers and are
10370 if (specs
->type
!= NULL_TREE
)
10372 gcc_assert (!specs
->long_p
&& !specs
->long_long_p
&& !specs
->short_p
10373 && !specs
->signed_p
&& !specs
->unsigned_p
10374 && !specs
->complex_p
);
10376 /* Set a dummy type. */
10377 if (TREE_CODE (specs
->type
) == ERROR_MARK
)
10378 specs
->type
= integer_type_node
;
10382 /* If none of "void", "_Bool", "char", "int", "float" or "double"
10383 has been specified, treat it as "int" unless "_Complex" is
10384 present and there are no other specifiers. If we just have
10385 "_Complex", it is equivalent to "_Complex double", but e.g.
10386 "_Complex short" is equivalent to "_Complex short int". */
10387 if (specs
->typespec_word
== cts_none
)
10389 if (specs
->saturating_p
)
10391 error_at (specs
->locations
[cdw_saturating
],
10392 "%<_Sat%> is used without %<_Fract%> or %<_Accum%>");
10393 if (!targetm
.fixed_point_supported_p ())
10394 error_at (specs
->locations
[cdw_saturating
],
10395 "fixed-point types not supported for this target");
10396 specs
->typespec_word
= cts_fract
;
10398 else if (specs
->long_p
|| specs
->short_p
10399 || specs
->signed_p
|| specs
->unsigned_p
)
10401 specs
->typespec_word
= cts_int
;
10403 else if (specs
->complex_p
)
10405 specs
->typespec_word
= cts_double
;
10406 pedwarn (specs
->locations
[cdw_complex
], OPT_Wpedantic
,
10407 "ISO C does not support plain %<complex%> meaning "
10408 "%<double complex%>");
10412 specs
->typespec_word
= cts_int
;
10413 specs
->default_int_p
= true;
10414 /* We don't diagnose this here because grokdeclarator will
10415 give more specific diagnostics according to whether it is
10416 a function definition. */
10420 /* If "signed" was specified, record this to distinguish "int" and
10421 "signed int" in the case of a bit-field with
10422 -funsigned-bitfields. */
10423 specs
->explicit_signed_p
= specs
->signed_p
;
10425 /* Now compute the actual type. */
10426 switch (specs
->typespec_word
)
10428 case cts_auto_type
:
10429 gcc_assert (!specs
->long_p
&& !specs
->short_p
10430 && !specs
->signed_p
&& !specs
->unsigned_p
10431 && !specs
->complex_p
);
10432 /* Type to be filled in later. */
10435 gcc_assert (!specs
->long_p
&& !specs
->short_p
10436 && !specs
->signed_p
&& !specs
->unsigned_p
10437 && !specs
->complex_p
);
10438 specs
->type
= void_type_node
;
10441 gcc_assert (!specs
->long_p
&& !specs
->short_p
10442 && !specs
->signed_p
&& !specs
->unsigned_p
10443 && !specs
->complex_p
);
10444 specs
->type
= boolean_type_node
;
10447 gcc_assert (!specs
->long_p
&& !specs
->short_p
);
10448 gcc_assert (!(specs
->signed_p
&& specs
->unsigned_p
));
10449 if (specs
->signed_p
)
10450 specs
->type
= signed_char_type_node
;
10451 else if (specs
->unsigned_p
)
10452 specs
->type
= unsigned_char_type_node
;
10454 specs
->type
= char_type_node
;
10455 if (specs
->complex_p
)
10457 pedwarn (specs
->locations
[cdw_complex
], OPT_Wpedantic
,
10458 "ISO C does not support complex integer types");
10459 specs
->type
= build_complex_type (specs
->type
);
10463 gcc_assert (!specs
->long_p
&& !specs
->short_p
&& !specs
->long_long_p
);
10464 gcc_assert (!(specs
->signed_p
&& specs
->unsigned_p
));
10465 specs
->type
= (specs
->unsigned_p
10466 ? int_n_trees
[specs
->int_n_idx
].unsigned_type
10467 : int_n_trees
[specs
->int_n_idx
].signed_type
);
10468 if (specs
->complex_p
)
10470 pedwarn (specs
->locations
[cdw_complex
], OPT_Wpedantic
,
10471 "ISO C does not support complex integer types");
10472 specs
->type
= build_complex_type (specs
->type
);
10476 gcc_assert (!(specs
->long_p
&& specs
->short_p
));
10477 gcc_assert (!(specs
->signed_p
&& specs
->unsigned_p
));
10478 if (specs
->long_long_p
)
10479 specs
->type
= (specs
->unsigned_p
10480 ? long_long_unsigned_type_node
10481 : long_long_integer_type_node
);
10482 else if (specs
->long_p
)
10483 specs
->type
= (specs
->unsigned_p
10484 ? long_unsigned_type_node
10485 : long_integer_type_node
);
10486 else if (specs
->short_p
)
10487 specs
->type
= (specs
->unsigned_p
10488 ? short_unsigned_type_node
10489 : short_integer_type_node
);
10491 specs
->type
= (specs
->unsigned_p
10492 ? unsigned_type_node
10493 : integer_type_node
);
10494 if (specs
->complex_p
)
10496 pedwarn (specs
->locations
[cdw_complex
], OPT_Wpedantic
,
10497 "ISO C does not support complex integer types");
10498 specs
->type
= build_complex_type (specs
->type
);
10502 gcc_assert (!specs
->long_p
&& !specs
->short_p
10503 && !specs
->signed_p
&& !specs
->unsigned_p
);
10504 specs
->type
= (specs
->complex_p
10505 ? complex_float_type_node
10506 : float_type_node
);
10509 gcc_assert (!specs
->long_long_p
&& !specs
->short_p
10510 && !specs
->signed_p
&& !specs
->unsigned_p
);
10513 specs
->type
= (specs
->complex_p
10514 ? complex_long_double_type_node
10515 : long_double_type_node
);
10519 specs
->type
= (specs
->complex_p
10520 ? complex_double_type_node
10521 : double_type_node
);
10526 case cts_dfloat128
:
10527 gcc_assert (!specs
->long_p
&& !specs
->long_long_p
&& !specs
->short_p
10528 && !specs
->signed_p
&& !specs
->unsigned_p
&& !specs
->complex_p
);
10529 if (specs
->typespec_word
== cts_dfloat32
)
10530 specs
->type
= dfloat32_type_node
;
10531 else if (specs
->typespec_word
== cts_dfloat64
)
10532 specs
->type
= dfloat64_type_node
;
10534 specs
->type
= dfloat128_type_node
;
10537 gcc_assert (!specs
->complex_p
);
10538 if (!targetm
.fixed_point_supported_p ())
10539 specs
->type
= integer_type_node
;
10540 else if (specs
->saturating_p
)
10542 if (specs
->long_long_p
)
10543 specs
->type
= specs
->unsigned_p
10544 ? sat_unsigned_long_long_fract_type_node
10545 : sat_long_long_fract_type_node
;
10546 else if (specs
->long_p
)
10547 specs
->type
= specs
->unsigned_p
10548 ? sat_unsigned_long_fract_type_node
10549 : sat_long_fract_type_node
;
10550 else if (specs
->short_p
)
10551 specs
->type
= specs
->unsigned_p
10552 ? sat_unsigned_short_fract_type_node
10553 : sat_short_fract_type_node
;
10555 specs
->type
= specs
->unsigned_p
10556 ? sat_unsigned_fract_type_node
10557 : sat_fract_type_node
;
10561 if (specs
->long_long_p
)
10562 specs
->type
= specs
->unsigned_p
10563 ? unsigned_long_long_fract_type_node
10564 : long_long_fract_type_node
;
10565 else if (specs
->long_p
)
10566 specs
->type
= specs
->unsigned_p
10567 ? unsigned_long_fract_type_node
10568 : long_fract_type_node
;
10569 else if (specs
->short_p
)
10570 specs
->type
= specs
->unsigned_p
10571 ? unsigned_short_fract_type_node
10572 : short_fract_type_node
;
10574 specs
->type
= specs
->unsigned_p
10575 ? unsigned_fract_type_node
10580 gcc_assert (!specs
->complex_p
);
10581 if (!targetm
.fixed_point_supported_p ())
10582 specs
->type
= integer_type_node
;
10583 else if (specs
->saturating_p
)
10585 if (specs
->long_long_p
)
10586 specs
->type
= specs
->unsigned_p
10587 ? sat_unsigned_long_long_accum_type_node
10588 : sat_long_long_accum_type_node
;
10589 else if (specs
->long_p
)
10590 specs
->type
= specs
->unsigned_p
10591 ? sat_unsigned_long_accum_type_node
10592 : sat_long_accum_type_node
;
10593 else if (specs
->short_p
)
10594 specs
->type
= specs
->unsigned_p
10595 ? sat_unsigned_short_accum_type_node
10596 : sat_short_accum_type_node
;
10598 specs
->type
= specs
->unsigned_p
10599 ? sat_unsigned_accum_type_node
10600 : sat_accum_type_node
;
10604 if (specs
->long_long_p
)
10605 specs
->type
= specs
->unsigned_p
10606 ? unsigned_long_long_accum_type_node
10607 : long_long_accum_type_node
;
10608 else if (specs
->long_p
)
10609 specs
->type
= specs
->unsigned_p
10610 ? unsigned_long_accum_type_node
10611 : long_accum_type_node
;
10612 else if (specs
->short_p
)
10613 specs
->type
= specs
->unsigned_p
10614 ? unsigned_short_accum_type_node
10615 : short_accum_type_node
;
10617 specs
->type
= specs
->unsigned_p
10618 ? unsigned_accum_type_node
10623 gcc_unreachable ();
10629 /* A subroutine of c_write_global_declarations. Perform final processing
10630 on one file scope's declarations (or the external scope's declarations),
10634 c_write_global_declarations_1 (tree globals
)
10639 /* Process the decls in the order they were written. */
10640 for (decl
= globals
; decl
; decl
= DECL_CHAIN (decl
))
10642 /* Check for used but undefined static functions using the C
10643 standard's definition of "used", and set TREE_NO_WARNING so
10644 that check_global_declarations doesn't repeat the check. */
10645 if (TREE_CODE (decl
) == FUNCTION_DECL
10646 && DECL_INITIAL (decl
) == 0
10647 && DECL_EXTERNAL (decl
)
10648 && !TREE_PUBLIC (decl
)
10649 && C_DECL_USED (decl
))
10651 pedwarn (input_location
, 0, "%q+F used but never defined", decl
);
10652 TREE_NO_WARNING (decl
) = 1;
10655 wrapup_global_declaration_1 (decl
);
10660 reconsider
= false;
10661 for (decl
= globals
; decl
; decl
= DECL_CHAIN (decl
))
10662 reconsider
|= wrapup_global_declaration_2 (decl
);
10664 while (reconsider
);
10666 for (decl
= globals
; decl
; decl
= DECL_CHAIN (decl
))
10667 check_global_declaration_1 (decl
);
10670 /* A subroutine of c_write_global_declarations Emit debug information for each
10671 of the declarations in GLOBALS. */
10674 c_write_global_declarations_2 (tree globals
)
10678 for (decl
= globals
; decl
; decl
= DECL_CHAIN (decl
))
10679 debug_hooks
->global_decl (decl
);
10682 /* Callback to collect a source_ref from a DECL. */
10685 collect_source_ref_cb (tree decl
)
10687 if (!DECL_IS_BUILTIN (decl
))
10688 collect_source_ref (LOCATION_FILE (decl_sloc (decl
, false)));
10691 /* Preserve the external declarations scope across a garbage collect. */
10692 static GTY(()) tree ext_block
;
10694 /* Collect all references relevant to SOURCE_FILE. */
10697 collect_all_refs (const char *source_file
)
10702 FOR_EACH_VEC_ELT (*all_translation_units
, i
, t
)
10703 collect_ada_nodes (BLOCK_VARS (DECL_INITIAL (t
)), source_file
);
10705 collect_ada_nodes (BLOCK_VARS (ext_block
), source_file
);
10708 /* Iterate over all global declarations and call CALLBACK. */
10711 for_each_global_decl (void (*callback
) (tree decl
))
10718 FOR_EACH_VEC_ELT (*all_translation_units
, i
, t
)
10720 decls
= DECL_INITIAL (t
);
10721 for (decl
= BLOCK_VARS (decls
); decl
; decl
= TREE_CHAIN (decl
))
10725 for (decl
= BLOCK_VARS (ext_block
); decl
; decl
= TREE_CHAIN (decl
))
10730 c_write_global_declarations (void)
10735 /* We don't want to do this if generating a PCH. */
10739 timevar_start (TV_PHASE_DEFERRED
);
10741 /* Do the Objective-C stuff. This is where all the Objective-C
10742 module stuff gets generated (symtab, class/protocol/selector
10744 if (c_dialect_objc ())
10745 objc_write_global_declarations ();
10747 /* Close the external scope. */
10748 ext_block
= pop_scope ();
10749 external_scope
= 0;
10750 gcc_assert (!current_scope
);
10752 /* Handle -fdump-ada-spec[-slim]. */
10753 if (flag_dump_ada_spec
|| flag_dump_ada_spec_slim
)
10755 /* Build a table of files to generate specs for */
10756 if (flag_dump_ada_spec_slim
)
10757 collect_source_ref (main_input_filename
);
10759 for_each_global_decl (collect_source_ref_cb
);
10761 dump_ada_specs (collect_all_refs
, NULL
);
10766 tree tmp
= BLOCK_VARS (ext_block
);
10768 FILE * stream
= dump_begin (TDI_tu
, &flags
);
10771 dump_node (tmp
, flags
& ~TDF_SLIM
, stream
);
10772 dump_end (TDI_tu
, stream
);
10776 /* Process all file scopes in this compilation, and the external_scope,
10777 through wrapup_global_declarations and check_global_declarations. */
10778 FOR_EACH_VEC_ELT (*all_translation_units
, i
, t
)
10779 c_write_global_declarations_1 (BLOCK_VARS (DECL_INITIAL (t
)));
10780 c_write_global_declarations_1 (BLOCK_VARS (ext_block
));
10782 timevar_stop (TV_PHASE_DEFERRED
);
10783 timevar_start (TV_PHASE_OPT_GEN
);
10785 /* We're done parsing; proceed to optimize and emit assembly.
10786 FIXME: shouldn't be the front end's responsibility to call this. */
10787 symtab
->finalize_compilation_unit ();
10789 timevar_stop (TV_PHASE_OPT_GEN
);
10790 timevar_start (TV_PHASE_DBGINFO
);
10792 /* After cgraph has had a chance to emit everything that's going to
10793 be emitted, output debug information for globals. */
10794 if (!seen_error ())
10796 timevar_push (TV_SYMOUT
);
10797 FOR_EACH_VEC_ELT (*all_translation_units
, i
, t
)
10798 c_write_global_declarations_2 (BLOCK_VARS (DECL_INITIAL (t
)));
10799 c_write_global_declarations_2 (BLOCK_VARS (ext_block
));
10800 timevar_pop (TV_SYMOUT
);
10804 timevar_stop (TV_PHASE_DBGINFO
);
10807 /* Register reserved keyword WORD as qualifier for address space AS. */
10810 c_register_addr_space (const char *word
, addr_space_t as
)
10812 int rid
= RID_FIRST_ADDR_SPACE
+ as
;
10815 /* Address space qualifiers are only supported
10816 in C with GNU extensions enabled. */
10817 if (c_dialect_objc () || flag_no_asm
)
10820 id
= get_identifier (word
);
10821 C_SET_RID_CODE (id
, rid
);
10822 C_IS_RESERVED_WORD (id
) = 1;
10823 ridpointers
[rid
] = id
;
10826 /* Return identifier to look up for omp declare reduction. */
10829 c_omp_reduction_id (enum tree_code reduction_code
, tree reduction_id
)
10831 const char *p
= NULL
;
10832 switch (reduction_code
)
10834 case PLUS_EXPR
: p
= "+"; break;
10835 case MULT_EXPR
: p
= "*"; break;
10836 case MINUS_EXPR
: p
= "-"; break;
10837 case BIT_AND_EXPR
: p
= "&"; break;
10838 case BIT_XOR_EXPR
: p
= "^"; break;
10839 case BIT_IOR_EXPR
: p
= "|"; break;
10840 case TRUTH_ANDIF_EXPR
: p
= "&&"; break;
10841 case TRUTH_ORIF_EXPR
: p
= "||"; break;
10842 case MIN_EXPR
: p
= "min"; break;
10843 case MAX_EXPR
: p
= "max"; break;
10850 if (TREE_CODE (reduction_id
) != IDENTIFIER_NODE
)
10851 return error_mark_node
;
10852 p
= IDENTIFIER_POINTER (reduction_id
);
10855 const char prefix
[] = "omp declare reduction ";
10856 size_t lenp
= sizeof (prefix
);
10857 size_t len
= strlen (p
);
10858 char *name
= XALLOCAVEC (char, lenp
+ len
);
10859 memcpy (name
, prefix
, lenp
- 1);
10860 memcpy (name
+ lenp
- 1, p
, len
+ 1);
10861 return get_identifier (name
);
10864 /* Lookup REDUCTION_ID in the current scope, or create an artificial
10865 VAR_DECL, bind it into the current scope and return it. */
10868 c_omp_reduction_decl (tree reduction_id
)
10870 struct c_binding
*b
= I_SYMBOL_BINDING (reduction_id
);
10871 if (b
!= NULL
&& B_IN_CURRENT_SCOPE (b
))
10874 tree decl
= build_decl (BUILTINS_LOCATION
, VAR_DECL
,
10875 reduction_id
, integer_type_node
);
10876 DECL_ARTIFICIAL (decl
) = 1;
10877 DECL_EXTERNAL (decl
) = 1;
10878 TREE_STATIC (decl
) = 1;
10879 TREE_PUBLIC (decl
) = 0;
10880 bind (reduction_id
, decl
, current_scope
, true, false, BUILTINS_LOCATION
);
10884 /* Lookup REDUCTION_ID in the first scope where it has entry for TYPE. */
10887 c_omp_reduction_lookup (tree reduction_id
, tree type
)
10889 struct c_binding
*b
= I_SYMBOL_BINDING (reduction_id
);
10893 for (t
= DECL_INITIAL (b
->decl
); t
; t
= TREE_CHAIN (t
))
10894 if (comptypes (TREE_PURPOSE (t
), type
))
10895 return TREE_VALUE (t
);
10898 return error_mark_node
;
10901 /* Helper function called via walk_tree, to diagnose invalid
10902 #pragma omp declare reduction combiners or initializers. */
10905 c_check_omp_declare_reduction_r (tree
*tp
, int *, void *data
)
10907 tree
*vars
= (tree
*) data
;
10908 if (SSA_VAR_P (*tp
)
10909 && !DECL_ARTIFICIAL (*tp
)
10913 location_t loc
= DECL_SOURCE_LOCATION (vars
[0]);
10914 if (strcmp (IDENTIFIER_POINTER (DECL_NAME (vars
[0])), "omp_out") == 0)
10915 error_at (loc
, "%<#pragma omp declare reduction%> combiner refers to "
10916 "variable %qD which is not %<omp_out%> nor %<omp_in%>",
10919 error_at (loc
, "%<#pragma omp declare reduction%> initializer refers "
10920 "to variable %qD which is not %<omp_priv%> nor "
10928 #include "gt-c-c-decl.h"