1 /* Process declarations and variables for C compiler.
2 Copyright (C) 1988-2017 Free Software Foundation, Inc.
4 This file is part of GCC.
6 GCC is free software; you can redistribute it and/or modify it under
7 the terms of the GNU General Public License as published by the Free
8 Software Foundation; either version 3, or (at your option) any later
11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 You should have received a copy of the GNU General Public License
17 along with GCC; see the file COPYING3. If not see
18 <http://www.gnu.org/licenses/>. */
20 /* Process declarations and symbol lookup for C front end.
21 Also constructs types; the standard scalar types at initialization,
22 and structure, union, array and enum types when they are declared. */
24 /* ??? not all decl nodes are given the most useful possible
25 line numbers. For example, the CONST_DECLs for enum values. */
29 #include "coretypes.h"
34 #include "stringpool.h"
37 #include "print-tree.h"
38 #include "stor-layout.h"
43 #include "c-family/c-objc.h"
44 #include "c-family/c-pragma.h"
45 #include "c-family/c-ubsan.h"
47 #include "langhooks.h"
48 #include "tree-iterator.h"
51 #include "c-family/c-ada-spec.h"
54 #include "spellcheck-tree.h"
55 #include "gcc-rich-location.h"
58 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
60 { NORMAL
, /* Ordinary declaration */
61 FUNCDEF
, /* Function definition */
62 PARM
, /* Declaration of parm before function body */
63 FIELD
, /* Declaration inside struct or union */
64 TYPENAME
}; /* Typename (inside cast or sizeof) */
66 /* States indicating how grokdeclarator() should handle declspecs marked
67 with __attribute__((deprecated)). An object declared as
68 __attribute__((deprecated)) suppresses warnings of uses of other
71 enum deprecated_states
{
77 /* Nonzero if we have seen an invalid cross reference
78 to a struct, union, or enum, but not yet printed the message. */
79 tree pending_invalid_xref
;
81 /* File and line to appear in the eventual error message. */
82 location_t pending_invalid_xref_location
;
84 /* The file and line that the prototype came from if this is an
85 old-style definition; used for diagnostics in
86 store_parm_decls_oldstyle. */
88 static location_t current_function_prototype_locus
;
90 /* Whether this prototype was built-in. */
92 static bool current_function_prototype_built_in
;
94 /* The argument type information of this prototype. */
96 static tree current_function_prototype_arg_types
;
98 /* The argument information structure for the function currently being
101 static struct c_arg_info
*current_function_arg_info
;
103 /* The obstack on which parser and related data structures, which are
104 not live beyond their top-level declaration or definition, are
106 struct obstack parser_obstack
;
108 /* The current statement tree. */
110 static GTY(()) struct stmt_tree_s c_stmt_tree
;
112 /* State saving variables. */
116 /* A list of decls to be made automatically visible in each file scope. */
117 static GTY(()) tree visible_builtins
;
119 /* Set to 0 at beginning of a function definition, set to 1 if
120 a return statement that specifies a return value is seen. */
122 int current_function_returns_value
;
124 /* Set to 0 at beginning of a function definition, set to 1 if
125 a return statement with no argument is seen. */
127 int current_function_returns_null
;
129 /* Set to 0 at beginning of a function definition, set to 1 if
130 a call to a noreturn function is seen. */
132 int current_function_returns_abnormally
;
134 /* Set to nonzero by `grokdeclarator' for a function
135 whose return type is defaulted, if warnings for this are desired. */
137 static int warn_about_return_type
;
139 /* Nonzero when the current toplevel function contains a declaration
140 of a nested function which is never defined. */
142 static bool undef_nested_function
;
144 /* If non-zero, implicit "omp declare target" attribute is added into the
146 int current_omp_declare_target_attribute
;
148 /* Each c_binding structure describes one binding of an identifier to
149 a decl. All the decls in a scope - irrespective of namespace - are
150 chained together by the ->prev field, which (as the name implies)
151 runs in reverse order. All the decls in a given namespace bound to
152 a given identifier are chained by the ->shadowed field, which runs
153 from inner to outer scopes.
155 The ->decl field usually points to a DECL node, but there are two
156 exceptions. In the namespace of type tags, the bound entity is a
157 RECORD_TYPE, UNION_TYPE, or ENUMERAL_TYPE node. If an undeclared
158 identifier is encountered, it is bound to error_mark_node to
159 suppress further errors about that identifier in the current
162 The ->u.type field stores the type of the declaration in this scope;
163 if NULL, the type is the type of the ->decl field. This is only of
164 relevance for objects with external or internal linkage which may
165 be redeclared in inner scopes, forming composite types that only
166 persist for the duration of those scopes. In the external scope,
167 this stores the composite of all the types declared for this
168 object, visible or not. The ->inner_comp field (used only at file
169 scope) stores whether an incomplete array type at file scope was
170 completed at an inner scope to an array size other than 1.
172 The ->u.label field is used for labels. It points to a structure
173 which stores additional information used for warnings.
175 The depth field is copied from the scope structure that holds this
176 decl. It is used to preserve the proper ordering of the ->shadowed
177 field (see bind()) and also for a handful of special-case checks.
178 Finally, the invisible bit is true for a decl which should be
179 ignored for purposes of normal name lookup, and the nested bit is
180 true for a decl that's been bound a second time in an inner scope;
181 in all such cases, the binding in the outer scope will have its
182 invisible bit true. */
184 struct GTY((chain_next ("%h.prev"))) c_binding
{
185 union GTY(()) { /* first so GTY desc can use decl */
186 tree
GTY((tag ("0"))) type
; /* the type in this scope */
187 struct c_label_vars
* GTY((tag ("1"))) label
; /* for warnings */
188 } GTY((desc ("TREE_CODE (%0.decl) == LABEL_DECL"))) u
;
189 tree decl
; /* the decl bound */
190 tree id
; /* the identifier it's bound to */
191 struct c_binding
*prev
; /* the previous decl in this scope */
192 struct c_binding
*shadowed
; /* the innermost decl shadowed by this one */
193 unsigned int depth
: 28; /* depth of this scope */
194 BOOL_BITFIELD invisible
: 1; /* normal lookup should ignore this binding */
195 BOOL_BITFIELD nested
: 1; /* do not set DECL_CONTEXT when popping */
196 BOOL_BITFIELD inner_comp
: 1; /* incomplete array completed in inner scope */
197 BOOL_BITFIELD in_struct
: 1; /* currently defined as struct field */
198 location_t locus
; /* location for nested bindings */
200 #define B_IN_SCOPE(b1, b2) ((b1)->depth == (b2)->depth)
201 #define B_IN_CURRENT_SCOPE(b) ((b)->depth == current_scope->depth)
202 #define B_IN_FILE_SCOPE(b) ((b)->depth == 1 /*file_scope->depth*/)
203 #define B_IN_EXTERNAL_SCOPE(b) ((b)->depth == 0 /*external_scope->depth*/)
205 /* Each C symbol points to three linked lists of c_binding structures.
206 These describe the values of the identifier in the three different
207 namespaces defined by the language. */
209 struct GTY(()) lang_identifier
{
210 struct c_common_identifier common_id
;
211 struct c_binding
*symbol_binding
; /* vars, funcs, constants, typedefs */
212 struct c_binding
*tag_binding
; /* struct/union/enum tags */
213 struct c_binding
*label_binding
; /* labels */
216 /* Validate c-lang.c's assumptions. */
217 extern char C_SIZEOF_STRUCT_LANG_IDENTIFIER_isnt_accurate
218 [(sizeof(struct lang_identifier
) == C_SIZEOF_STRUCT_LANG_IDENTIFIER
) ? 1 : -1];
220 /* The binding oracle; see c-tree.h. */
221 void (*c_binding_oracle
) (enum c_oracle_request
, tree identifier
);
223 /* This flag is set on an identifier if we have previously asked the
224 binding oracle for this identifier's symbol binding. */
225 #define I_SYMBOL_CHECKED(node) \
226 (TREE_LANG_FLAG_4 (IDENTIFIER_NODE_CHECK (node)))
228 static inline struct c_binding
* *
229 i_symbol_binding (tree node
)
231 struct lang_identifier
*lid
232 = (struct lang_identifier
*) IDENTIFIER_NODE_CHECK (node
);
234 if (lid
->symbol_binding
== NULL
235 && c_binding_oracle
!= NULL
236 && !I_SYMBOL_CHECKED (node
))
238 /* Set the "checked" flag first, to avoid infinite recursion
239 when the binding oracle calls back into gcc. */
240 I_SYMBOL_CHECKED (node
) = 1;
241 c_binding_oracle (C_ORACLE_SYMBOL
, node
);
244 return &lid
->symbol_binding
;
247 #define I_SYMBOL_BINDING(node) (*i_symbol_binding (node))
249 #define I_SYMBOL_DECL(node) \
250 (I_SYMBOL_BINDING(node) ? I_SYMBOL_BINDING(node)->decl : 0)
252 /* This flag is set on an identifier if we have previously asked the
253 binding oracle for this identifier's tag binding. */
254 #define I_TAG_CHECKED(node) \
255 (TREE_LANG_FLAG_5 (IDENTIFIER_NODE_CHECK (node)))
257 static inline struct c_binding
**
258 i_tag_binding (tree node
)
260 struct lang_identifier
*lid
261 = (struct lang_identifier
*) IDENTIFIER_NODE_CHECK (node
);
263 if (lid
->tag_binding
== NULL
264 && c_binding_oracle
!= NULL
265 && !I_TAG_CHECKED (node
))
267 /* Set the "checked" flag first, to avoid infinite recursion
268 when the binding oracle calls back into gcc. */
269 I_TAG_CHECKED (node
) = 1;
270 c_binding_oracle (C_ORACLE_TAG
, node
);
273 return &lid
->tag_binding
;
276 #define I_TAG_BINDING(node) (*i_tag_binding (node))
278 #define I_TAG_DECL(node) \
279 (I_TAG_BINDING(node) ? I_TAG_BINDING(node)->decl : 0)
281 /* This flag is set on an identifier if we have previously asked the
282 binding oracle for this identifier's label binding. */
283 #define I_LABEL_CHECKED(node) \
284 (TREE_LANG_FLAG_6 (IDENTIFIER_NODE_CHECK (node)))
286 static inline struct c_binding
**
287 i_label_binding (tree node
)
289 struct lang_identifier
*lid
290 = (struct lang_identifier
*) IDENTIFIER_NODE_CHECK (node
);
292 if (lid
->label_binding
== NULL
293 && c_binding_oracle
!= NULL
294 && !I_LABEL_CHECKED (node
))
296 /* Set the "checked" flag first, to avoid infinite recursion
297 when the binding oracle calls back into gcc. */
298 I_LABEL_CHECKED (node
) = 1;
299 c_binding_oracle (C_ORACLE_LABEL
, node
);
302 return &lid
->label_binding
;
305 #define I_LABEL_BINDING(node) (*i_label_binding (node))
307 #define I_LABEL_DECL(node) \
308 (I_LABEL_BINDING(node) ? I_LABEL_BINDING(node)->decl : 0)
310 /* The resulting tree type. */
312 union GTY((desc ("TREE_CODE (&%h.generic) == IDENTIFIER_NODE"),
313 chain_next ("(union lang_tree_node *) c_tree_chain_next (&%h.generic)"))) lang_tree_node
315 union tree_node
GTY ((tag ("0"),
316 desc ("tree_node_structure (&%h)")))
318 struct lang_identifier
GTY ((tag ("1"))) identifier
;
321 /* Track bindings and other things that matter for goto warnings. For
322 efficiency, we do not gather all the decls at the point of
323 definition. Instead, we point into the bindings structure. As
324 scopes are popped, we update these structures and gather the decls
325 that matter at that time. */
327 struct GTY(()) c_spot_bindings
{
328 /* The currently open scope which holds bindings defined when the
329 label was defined or the goto statement was found. */
330 struct c_scope
*scope
;
331 /* The bindings in the scope field which were defined at the point
332 of the label or goto. This lets us look at older or newer
333 bindings in the scope, as appropriate. */
334 struct c_binding
*bindings_in_scope
;
335 /* The number of statement expressions that have started since this
336 label or goto statement was defined. This is zero if we are at
337 the same statement expression level. It is positive if we are in
338 a statement expression started since this spot. It is negative
339 if this spot was in a statement expression and we have left
342 /* Whether we started in a statement expression but are no longer in
343 it. This is set to true if stmt_exprs ever goes negative. */
347 /* This structure is used to keep track of bindings seen when a goto
348 statement is defined. This is only used if we see the goto
349 statement before we see the label. */
351 struct GTY(()) c_goto_bindings
{
352 /* The location of the goto statement. */
354 /* The bindings of the goto statement. */
355 struct c_spot_bindings goto_bindings
;
358 typedef struct c_goto_bindings
*c_goto_bindings_p
;
360 /* The additional information we keep track of for a label binding.
361 These fields are updated as scopes are popped. */
363 struct GTY(()) c_label_vars
{
364 /* The shadowed c_label_vars, when one label shadows another (which
365 can only happen using a __label__ declaration). */
366 struct c_label_vars
*shadowed
;
367 /* The bindings when the label was defined. */
368 struct c_spot_bindings label_bindings
;
369 /* A list of decls that we care about: decls about which we should
370 warn if a goto branches to this label from later in the function.
371 Decls are added to this list as scopes are popped. We only add
372 the decls that matter. */
373 vec
<tree
, va_gc
> *decls_in_scope
;
374 /* A list of goto statements to this label. This is only used for
375 goto statements seen before the label was defined, so that we can
376 issue appropriate warnings for them. */
377 vec
<c_goto_bindings_p
, va_gc
> *gotos
;
380 /* Each c_scope structure describes the complete contents of one
381 scope. Four scopes are distinguished specially: the innermost or
382 current scope, the innermost function scope, the file scope (always
383 the second to outermost) and the outermost or external scope.
385 Most declarations are recorded in the current scope.
387 All normal label declarations are recorded in the innermost
388 function scope, as are bindings of undeclared identifiers to
389 error_mark_node. (GCC permits nested functions as an extension,
390 hence the 'innermost' qualifier.) Explicitly declared labels
391 (using the __label__ extension) appear in the current scope.
393 Being in the file scope (current_scope == file_scope) causes
394 special behavior in several places below. Also, under some
395 conditions the Objective-C front end records declarations in the
396 file scope even though that isn't the current scope.
398 All declarations with external linkage are recorded in the external
399 scope, even if they aren't visible there; this models the fact that
400 such declarations are visible to the entire program, and (with a
401 bit of cleverness, see pushdecl) allows diagnosis of some violations
402 of C99 6.2.2p7 and 6.2.7p2:
404 If, within the same translation unit, the same identifier appears
405 with both internal and external linkage, the behavior is
408 All declarations that refer to the same object or function shall
409 have compatible type; otherwise, the behavior is undefined.
411 Initially only the built-in declarations, which describe compiler
412 intrinsic functions plus a subset of the standard library, are in
415 The order of the blocks list matters, and it is frequently appended
416 to. To avoid having to walk all the way to the end of the list on
417 each insertion, or reverse the list later, we maintain a pointer to
418 the last list entry. (FIXME: It should be feasible to use a reversed
421 The bindings list is strictly in reverse order of declarations;
422 pop_scope relies on this. */
425 struct GTY((chain_next ("%h.outer"))) c_scope
{
426 /* The scope containing this one. */
427 struct c_scope
*outer
;
429 /* The next outermost function scope. */
430 struct c_scope
*outer_function
;
432 /* All bindings in this scope. */
433 struct c_binding
*bindings
;
435 /* For each scope (except the global one), a chain of BLOCK nodes
436 for all the scopes that were entered and exited one level down. */
440 /* The depth of this scope. Used to keep the ->shadowed chain of
441 bindings sorted innermost to outermost. */
442 unsigned int depth
: 28;
444 /* True if we are currently filling this scope with parameter
446 BOOL_BITFIELD parm_flag
: 1;
448 /* True if we saw [*] in this scope. Used to give an error messages
449 if these appears in a function definition. */
450 BOOL_BITFIELD had_vla_unspec
: 1;
452 /* True if we already complained about forward parameter decls
453 in this scope. This prevents double warnings on
454 foo (int a; int b; ...) */
455 BOOL_BITFIELD warned_forward_parm_decls
: 1;
457 /* True if this is the outermost block scope of a function body.
458 This scope contains the parameters, the local variables declared
459 in the outermost block, and all the labels (except those in
460 nested functions, or declared at block scope with __label__). */
461 BOOL_BITFIELD function_body
: 1;
463 /* True means make a BLOCK for this scope no matter what. */
464 BOOL_BITFIELD keep
: 1;
466 /* True means that an unsuffixed float constant is _Decimal64. */
467 BOOL_BITFIELD float_const_decimal64
: 1;
469 /* True if this scope has any label bindings. This is used to speed
470 up searching for labels when popping scopes, particularly since
471 labels are normally only found at function scope. */
472 BOOL_BITFIELD has_label_bindings
: 1;
474 /* True if we should issue a warning if a goto statement crosses any
475 of the bindings. We still need to check the list of bindings to
476 find the specific ones we need to warn about. This is true if
477 decl_jump_unsafe would return true for any of the bindings. This
478 is used to avoid looping over all the bindings unnecessarily. */
479 BOOL_BITFIELD has_jump_unsafe_decl
: 1;
482 /* The scope currently in effect. */
484 static GTY(()) struct c_scope
*current_scope
;
486 /* The innermost function scope. Ordinary (not explicitly declared)
487 labels, bindings to error_mark_node, and the lazily-created
488 bindings of __func__ and its friends get this scope. */
490 static GTY(()) struct c_scope
*current_function_scope
;
492 /* The C file scope. This is reset for each input translation unit. */
494 static GTY(()) struct c_scope
*file_scope
;
496 /* The outermost scope. This is used for all declarations with
497 external linkage, and only these, hence the name. */
499 static GTY(()) struct c_scope
*external_scope
;
501 /* A chain of c_scope structures awaiting reuse. */
503 static GTY((deletable
)) struct c_scope
*scope_freelist
;
505 /* A chain of c_binding structures awaiting reuse. */
507 static GTY((deletable
)) struct c_binding
*binding_freelist
;
509 /* Append VAR to LIST in scope SCOPE. */
510 #define SCOPE_LIST_APPEND(scope, list, decl) do { \
511 struct c_scope *s_ = (scope); \
513 if (s_->list##_last) \
514 BLOCK_CHAIN (s_->list##_last) = d_; \
517 s_->list##_last = d_; \
520 /* Concatenate FROM in scope FSCOPE onto TO in scope TSCOPE. */
521 #define SCOPE_LIST_CONCAT(tscope, to, fscope, from) do { \
522 struct c_scope *t_ = (tscope); \
523 struct c_scope *f_ = (fscope); \
525 BLOCK_CHAIN (t_->to##_last) = f_->from; \
528 t_->to##_last = f_->from##_last; \
531 /* A c_inline_static structure stores details of a static identifier
532 referenced in a definition of a function that may be an inline
533 definition if no subsequent declaration of that function uses
534 "extern" or does not use "inline". */
536 struct GTY((chain_next ("%h.next"))) c_inline_static
{
537 /* The location for a diagnostic. */
540 /* The function that may be an inline definition. */
543 /* The object or function referenced. */
546 /* What sort of reference this is. */
547 enum c_inline_static_type type
;
549 /* The next such structure or NULL. */
550 struct c_inline_static
*next
;
553 /* List of static identifiers used or referenced in functions that may
554 be inline definitions. */
555 static GTY(()) struct c_inline_static
*c_inline_statics
;
557 /* True means unconditionally make a BLOCK for the next scope pushed. */
559 static bool keep_next_level_flag
;
561 /* True means the next call to push_scope will be the outermost scope
562 of a function body, so do not push a new scope, merely cease
563 expecting parameter decls. */
565 static bool next_is_function_body
;
567 /* A vector of pointers to c_binding structures. */
569 typedef struct c_binding
*c_binding_ptr
;
571 /* Information that we keep for a struct or union while it is being
574 struct c_struct_parse_info
576 /* If warn_cxx_compat, a list of types defined within this
578 auto_vec
<tree
> struct_types
;
579 /* If warn_cxx_compat, a list of field names which have bindings,
580 and which are defined in this struct, but which are not defined
581 in any enclosing struct. This is used to clear the in_struct
582 field of the c_bindings structure. */
583 auto_vec
<c_binding_ptr
> fields
;
584 /* If warn_cxx_compat, a list of typedef names used when defining
585 fields in this struct. */
586 auto_vec
<tree
> typedefs_seen
;
589 /* Information for the struct or union currently being parsed, or
590 NULL if not parsing a struct or union. */
591 static struct c_struct_parse_info
*struct_parse_info
;
593 /* Forward declarations. */
594 static tree
lookup_name_in_scope (tree
, struct c_scope
*);
595 static tree
c_make_fname_decl (location_t
, tree
, int);
596 static tree
grokdeclarator (const struct c_declarator
*,
597 struct c_declspecs
*,
598 enum decl_context
, bool, tree
*, tree
*, tree
*,
599 bool *, enum deprecated_states
);
600 static tree
grokparms (struct c_arg_info
*, bool);
601 static void layout_array_type (tree
);
602 static void warn_defaults_to (location_t
, int, const char *, ...)
603 ATTRIBUTE_GCC_DIAG(3,4);
605 /* T is a statement. Add it to the statement-tree. This is the
606 C/ObjC version--C++ has a slightly different version of this
612 enum tree_code code
= TREE_CODE (t
);
614 if (CAN_HAVE_LOCATION_P (t
) && code
!= LABEL_EXPR
)
616 if (!EXPR_HAS_LOCATION (t
))
617 SET_EXPR_LOCATION (t
, input_location
);
620 if (code
== LABEL_EXPR
|| code
== CASE_LABEL_EXPR
)
621 STATEMENT_LIST_HAS_LABEL (cur_stmt_list
) = 1;
623 /* Add T to the statement-tree. Non-side-effect statements need to be
624 recorded during statement expressions. */
625 if (!building_stmt_list_p ())
627 append_to_statement_list_force (t
, &cur_stmt_list
);
632 /* Build a pointer type using the default pointer mode. */
635 c_build_pointer_type (tree to_type
)
637 addr_space_t as
= to_type
== error_mark_node
? ADDR_SPACE_GENERIC
638 : TYPE_ADDR_SPACE (to_type
);
639 machine_mode pointer_mode
;
641 if (as
!= ADDR_SPACE_GENERIC
|| c_default_pointer_mode
== VOIDmode
)
642 pointer_mode
= targetm
.addr_space
.pointer_mode (as
);
644 pointer_mode
= c_default_pointer_mode
;
645 return build_pointer_type_for_mode (to_type
, pointer_mode
, false);
649 /* Return true if we will want to say something if a goto statement
653 decl_jump_unsafe (tree decl
)
655 if (error_operand_p (decl
))
658 /* Always warn about crossing variably modified types. */
659 if ((VAR_P (decl
) || TREE_CODE (decl
) == TYPE_DECL
)
660 && variably_modified_type_p (TREE_TYPE (decl
), NULL_TREE
))
663 /* Otherwise, only warn if -Wgoto-misses-init and this is an
664 initialized automatic decl. */
665 if (warn_jump_misses_init
667 && !TREE_STATIC (decl
)
668 && DECL_INITIAL (decl
) != NULL_TREE
)
676 c_print_identifier (FILE *file
, tree node
, int indent
)
678 void (*save
) (enum c_oracle_request
, tree identifier
);
680 /* Temporarily hide any binding oracle. Without this, calls to
681 debug_tree from the debugger will end up calling into the oracle,
682 making for a confusing debug session. As the oracle isn't needed
683 here for normal operation, it's simplest to suppress it. */
684 save
= c_binding_oracle
;
685 c_binding_oracle
= NULL
;
687 print_node (file
, "symbol", I_SYMBOL_DECL (node
), indent
+ 4);
688 print_node (file
, "tag", I_TAG_DECL (node
), indent
+ 4);
689 print_node (file
, "label", I_LABEL_DECL (node
), indent
+ 4);
690 if (C_IS_RESERVED_WORD (node
) && C_RID_CODE (node
) != RID_CXX_COMPAT_WARN
)
692 tree rid
= ridpointers
[C_RID_CODE (node
)];
693 indent_to (file
, indent
+ 4);
694 fprintf (file
, "rid " HOST_PTR_PRINTF
" \"%s\"",
695 (void *) rid
, IDENTIFIER_POINTER (rid
));
698 c_binding_oracle
= save
;
701 /* Establish a binding between NAME, an IDENTIFIER_NODE, and DECL,
702 which may be any of several kinds of DECL or TYPE or error_mark_node,
703 in the scope SCOPE. */
705 bind (tree name
, tree decl
, struct c_scope
*scope
, bool invisible
,
706 bool nested
, location_t locus
)
708 struct c_binding
*b
, **here
;
710 if (binding_freelist
)
712 b
= binding_freelist
;
713 binding_freelist
= b
->prev
;
716 b
= ggc_alloc
<c_binding
> ();
721 b
->depth
= scope
->depth
;
722 b
->invisible
= invisible
;
730 b
->prev
= scope
->bindings
;
733 if (decl_jump_unsafe (decl
))
734 scope
->has_jump_unsafe_decl
= 1;
739 switch (TREE_CODE (decl
))
741 case LABEL_DECL
: here
= &I_LABEL_BINDING (name
); break;
744 case RECORD_TYPE
: here
= &I_TAG_BINDING (name
); break;
750 case ERROR_MARK
: here
= &I_SYMBOL_BINDING (name
); break;
756 /* Locate the appropriate place in the chain of shadowed decls
757 to insert this binding. Normally, scope == current_scope and
758 this does nothing. */
759 while (*here
&& (*here
)->depth
> scope
->depth
)
760 here
= &(*here
)->shadowed
;
766 /* Clear the binding structure B, stick it on the binding_freelist,
767 and return the former value of b->prev. This is used by pop_scope
768 and get_parm_info to iterate destructively over all the bindings
769 from a given scope. */
770 static struct c_binding
*
771 free_binding_and_advance (struct c_binding
*b
)
773 struct c_binding
*prev
= b
->prev
;
775 memset (b
, 0, sizeof (struct c_binding
));
776 b
->prev
= binding_freelist
;
777 binding_freelist
= b
;
782 /* Bind a label. Like bind, but skip fields which aren't used for
783 labels, and add the LABEL_VARS value. */
785 bind_label (tree name
, tree label
, struct c_scope
*scope
,
786 struct c_label_vars
*label_vars
)
790 bind (name
, label
, scope
, /*invisible=*/false, /*nested=*/false,
793 scope
->has_label_bindings
= true;
796 gcc_assert (b
->decl
== label
);
797 label_vars
->shadowed
= b
->u
.label
;
798 b
->u
.label
= label_vars
;
801 /* Hook called at end of compilation to assume 1 elt
802 for a file-scope tentative array defn that wasn't complete before. */
805 c_finish_incomplete_decl (tree decl
)
809 tree type
= TREE_TYPE (decl
);
810 if (type
!= error_mark_node
811 && TREE_CODE (type
) == ARRAY_TYPE
812 && !DECL_EXTERNAL (decl
)
813 && TYPE_DOMAIN (type
) == NULL_TREE
)
815 warning_at (DECL_SOURCE_LOCATION (decl
),
816 0, "array %q+D assumed to have one element", decl
);
818 complete_array_type (&TREE_TYPE (decl
), NULL_TREE
, true);
820 relayout_decl (decl
);
825 /* Record that inline function FUNC contains a reference (location
826 LOC) to static DECL (file-scope or function-local according to
830 record_inline_static (location_t loc
, tree func
, tree decl
,
831 enum c_inline_static_type type
)
833 c_inline_static
*csi
= ggc_alloc
<c_inline_static
> ();
835 csi
->function
= func
;
836 csi
->static_decl
= decl
;
838 csi
->next
= c_inline_statics
;
839 c_inline_statics
= csi
;
842 /* Check for references to static declarations in inline functions at
843 the end of the translation unit and diagnose them if the functions
844 are still inline definitions. */
847 check_inline_statics (void)
849 struct c_inline_static
*csi
;
850 for (csi
= c_inline_statics
; csi
; csi
= csi
->next
)
852 if (DECL_EXTERNAL (csi
->function
))
856 pedwarn (csi
->location
, 0,
857 "%qD is static but used in inline function %qD "
858 "which is not static", csi
->static_decl
, csi
->function
);
861 pedwarn (csi
->location
, 0,
862 "%q+D is static but declared in inline function %qD "
863 "which is not static", csi
->static_decl
, csi
->function
);
869 c_inline_statics
= NULL
;
872 /* Fill in a c_spot_bindings structure. If DEFINING is true, set it
873 for the current state, otherwise set it to uninitialized. */
876 set_spot_bindings (struct c_spot_bindings
*p
, bool defining
)
880 p
->scope
= current_scope
;
881 p
->bindings_in_scope
= current_scope
->bindings
;
886 p
->bindings_in_scope
= NULL
;
889 p
->left_stmt_expr
= false;
892 /* Update spot bindings P as we pop out of SCOPE. Return true if we
893 should push decls for a label. */
896 update_spot_bindings (struct c_scope
*scope
, struct c_spot_bindings
*p
)
898 if (p
->scope
!= scope
)
900 /* This label or goto is defined in some other scope, or it is a
901 label which is not yet defined. There is nothing to
906 /* Adjust the spot bindings to refer to the bindings already defined
907 in the enclosing scope. */
908 p
->scope
= scope
->outer
;
909 p
->bindings_in_scope
= p
->scope
->bindings
;
914 /* The Objective-C front-end often needs to determine the current scope. */
917 objc_get_current_scope (void)
919 return current_scope
;
922 /* The following function is used only by Objective-C. It needs to live here
923 because it accesses the innards of c_scope. */
926 objc_mark_locals_volatile (void *enclosing_blk
)
928 struct c_scope
*scope
;
931 for (scope
= current_scope
;
932 scope
&& scope
!= enclosing_blk
;
933 scope
= scope
->outer
)
935 for (b
= scope
->bindings
; b
; b
= b
->prev
)
936 objc_volatilize_decl (b
->decl
);
938 /* Do not climb up past the current function. */
939 if (scope
->function_body
)
944 /* Return true if we are in the global binding level. */
947 global_bindings_p (void)
949 return current_scope
== file_scope
;
953 keep_next_level (void)
955 keep_next_level_flag
= true;
958 /* Set the flag for the FLOAT_CONST_DECIMAL64 pragma being ON. */
961 set_float_const_decimal64 (void)
963 current_scope
->float_const_decimal64
= true;
966 /* Clear the flag for the FLOAT_CONST_DECIMAL64 pragma. */
969 clear_float_const_decimal64 (void)
971 current_scope
->float_const_decimal64
= false;
974 /* Return nonzero if an unsuffixed float constant is _Decimal64. */
977 float_const_decimal64_p (void)
979 return current_scope
->float_const_decimal64
;
982 /* Identify this scope as currently being filled with parameters. */
985 declare_parm_level (void)
987 current_scope
->parm_flag
= true;
993 if (next_is_function_body
)
995 /* This is the transition from the parameters to the top level
996 of the function body. These are the same scope
997 (C99 6.2.1p4,6) so we do not push another scope structure.
998 next_is_function_body is set only by store_parm_decls, which
999 in turn is called when and only when we are about to
1000 encounter the opening curly brace for the function body.
1002 The outermost block of a function always gets a BLOCK node,
1003 because the debugging output routines expect that each
1004 function has at least one BLOCK. */
1005 current_scope
->parm_flag
= false;
1006 current_scope
->function_body
= true;
1007 current_scope
->keep
= true;
1008 current_scope
->outer_function
= current_function_scope
;
1009 current_function_scope
= current_scope
;
1011 keep_next_level_flag
= false;
1012 next_is_function_body
= false;
1014 /* The FLOAT_CONST_DECIMAL64 pragma applies to nested scopes. */
1015 if (current_scope
->outer
)
1016 current_scope
->float_const_decimal64
1017 = current_scope
->outer
->float_const_decimal64
;
1019 current_scope
->float_const_decimal64
= false;
1023 struct c_scope
*scope
;
1026 scope
= scope_freelist
;
1027 scope_freelist
= scope
->outer
;
1030 scope
= ggc_cleared_alloc
<c_scope
> ();
1032 /* The FLOAT_CONST_DECIMAL64 pragma applies to nested scopes. */
1034 scope
->float_const_decimal64
= current_scope
->float_const_decimal64
;
1036 scope
->float_const_decimal64
= false;
1038 scope
->keep
= keep_next_level_flag
;
1039 scope
->outer
= current_scope
;
1040 scope
->depth
= current_scope
? (current_scope
->depth
+ 1) : 0;
1042 /* Check for scope depth overflow. Unlikely (2^28 == 268,435,456) but
1044 if (current_scope
&& scope
->depth
== 0)
1047 sorry ("GCC supports only %u nested scopes", scope
->depth
);
1050 current_scope
= scope
;
1051 keep_next_level_flag
= false;
1055 /* This is called when we are leaving SCOPE. For each label defined
1056 in SCOPE, add any appropriate decls to its decls_in_scope fields.
1057 These are the decls whose initialization will be skipped by a goto
1058 later in the function. */
1061 update_label_decls (struct c_scope
*scope
)
1068 if (s
->has_label_bindings
)
1070 struct c_binding
*b
;
1072 for (b
= s
->bindings
; b
!= NULL
; b
= b
->prev
)
1074 struct c_label_vars
*label_vars
;
1075 struct c_binding
*b1
;
1078 struct c_goto_bindings
*g
;
1080 if (TREE_CODE (b
->decl
) != LABEL_DECL
)
1082 label_vars
= b
->u
.label
;
1084 b1
= label_vars
->label_bindings
.bindings_in_scope
;
1085 if (label_vars
->label_bindings
.scope
== NULL
)
1088 hjud
= label_vars
->label_bindings
.scope
->has_jump_unsafe_decl
;
1089 if (update_spot_bindings (scope
, &label_vars
->label_bindings
))
1091 /* This label is defined in this scope. */
1094 for (; b1
!= NULL
; b1
= b1
->prev
)
1096 /* A goto from later in the function to this
1097 label will never see the initialization
1098 of B1, if any. Save it to issue a
1099 warning if needed. */
1100 if (decl_jump_unsafe (b1
->decl
))
1101 vec_safe_push(label_vars
->decls_in_scope
, b1
->decl
);
1106 /* Update the bindings of any goto statements associated
1108 FOR_EACH_VEC_SAFE_ELT (label_vars
->gotos
, ix
, g
)
1109 update_spot_bindings (scope
, &g
->goto_bindings
);
1113 /* Don't search beyond the current function. */
1114 if (s
== current_function_scope
)
1121 /* Set the TYPE_CONTEXT of all of TYPE's variants to CONTEXT. */
1124 set_type_context (tree type
, tree context
)
1126 for (type
= TYPE_MAIN_VARIANT (type
); type
;
1127 type
= TYPE_NEXT_VARIANT (type
))
1128 TYPE_CONTEXT (type
) = context
;
1131 /* Exit a scope. Restore the state of the identifier-decl mappings
1132 that were in effect when this scope was entered. Return a BLOCK
1133 node containing all the DECLs in this scope that are of interest
1134 to debug info generation. */
1139 struct c_scope
*scope
= current_scope
;
1140 tree block
, context
, p
;
1141 struct c_binding
*b
;
1143 bool functionbody
= scope
->function_body
;
1144 bool keep
= functionbody
|| scope
->keep
|| scope
->bindings
;
1146 update_label_decls (scope
);
1148 /* If appropriate, create a BLOCK to record the decls for the life
1149 of this function. */
1153 block
= make_node (BLOCK
);
1154 BLOCK_SUBBLOCKS (block
) = scope
->blocks
;
1155 TREE_USED (block
) = 1;
1157 /* In each subblock, record that this is its superior. */
1158 for (p
= scope
->blocks
; p
; p
= BLOCK_CHAIN (p
))
1159 BLOCK_SUPERCONTEXT (p
) = block
;
1161 BLOCK_VARS (block
) = NULL_TREE
;
1164 /* The TYPE_CONTEXTs for all of the tagged types belonging to this
1165 scope must be set so that they point to the appropriate
1166 construct, i.e. either to the current FUNCTION_DECL node, or
1167 else to the BLOCK node we just constructed.
1169 Note that for tagged types whose scope is just the formal
1170 parameter list for some function type specification, we can't
1171 properly set their TYPE_CONTEXTs here, because we don't have a
1172 pointer to the appropriate FUNCTION_TYPE node readily available
1173 to us. For those cases, the TYPE_CONTEXTs of the relevant tagged
1174 type nodes get set in `grokdeclarator' as soon as we have created
1175 the FUNCTION_TYPE node which will represent the "scope" for these
1176 "parameter list local" tagged types. */
1177 if (scope
->function_body
)
1178 context
= current_function_decl
;
1179 else if (scope
== file_scope
)
1182 = build_translation_unit_decl (get_identifier (main_input_filename
));
1183 context
= file_decl
;
1184 debug_hooks
->register_main_translation_unit (file_decl
);
1189 /* Clear all bindings in this scope. */
1190 for (b
= scope
->bindings
; b
; b
= free_binding_and_advance (b
))
1193 switch (TREE_CODE (p
))
1196 /* Warnings for unused labels, errors for undefined labels. */
1197 if (TREE_USED (p
) && !DECL_INITIAL (p
))
1199 error ("label %q+D used but not defined", p
);
1200 DECL_INITIAL (p
) = error_mark_node
;
1203 warn_for_unused_label (p
);
1205 /* Labels go in BLOCK_VARS. */
1206 DECL_CHAIN (p
) = BLOCK_VARS (block
);
1207 BLOCK_VARS (block
) = p
;
1208 gcc_assert (I_LABEL_BINDING (b
->id
) == b
);
1209 I_LABEL_BINDING (b
->id
) = b
->shadowed
;
1211 /* Also pop back to the shadowed label_vars. */
1212 release_tree_vector (b
->u
.label
->decls_in_scope
);
1213 b
->u
.label
= b
->u
.label
->shadowed
;
1219 set_type_context (p
, context
);
1221 /* Types may not have tag-names, in which case the type
1222 appears in the bindings list with b->id NULL. */
1225 gcc_assert (I_TAG_BINDING (b
->id
) == b
);
1226 I_TAG_BINDING (b
->id
) = b
->shadowed
;
1231 /* Propagate TREE_ADDRESSABLE from nested functions to their
1232 containing functions. */
1233 if (!TREE_ASM_WRITTEN (p
)
1234 && DECL_INITIAL (p
) != NULL_TREE
1235 && TREE_ADDRESSABLE (p
)
1236 && DECL_ABSTRACT_ORIGIN (p
) != NULL_TREE
1237 && DECL_ABSTRACT_ORIGIN (p
) != p
)
1238 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (p
)) = 1;
1239 if (!DECL_EXTERNAL (p
)
1240 && !DECL_INITIAL (p
)
1241 && scope
!= file_scope
1242 && scope
!= external_scope
)
1244 error ("nested function %q+D declared but never defined", p
);
1245 undef_nested_function
= true;
1247 else if (DECL_DECLARED_INLINE_P (p
)
1249 && !DECL_INITIAL (p
))
1251 /* C99 6.7.4p6: "a function with external linkage... declared
1252 with an inline function specifier ... shall also be defined
1253 in the same translation unit." */
1254 if (!flag_gnu89_inline
1255 && !lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (p
))
1256 && scope
!= external_scope
)
1257 pedwarn (input_location
, 0,
1258 "inline function %q+D declared but never defined", p
);
1259 DECL_EXTERNAL (p
) = 1;
1265 /* Warnings for unused variables. */
1266 if ((!TREE_USED (p
) || !DECL_READ_P (p
))
1267 && !TREE_NO_WARNING (p
)
1268 && !DECL_IN_SYSTEM_HEADER (p
)
1270 && !DECL_ARTIFICIAL (p
)
1271 && scope
!= file_scope
1272 && scope
!= external_scope
)
1275 warning (OPT_Wunused_variable
, "unused variable %q+D", p
);
1276 else if (DECL_CONTEXT (p
) == current_function_decl
)
1277 warning_at (DECL_SOURCE_LOCATION (p
),
1278 OPT_Wunused_but_set_variable
,
1279 "variable %qD set but not used", p
);
1284 error ("type of array %q+D completed incompatibly with"
1285 " implicit initialization", p
);
1292 /* All of these go in BLOCK_VARS, but only if this is the
1293 binding in the home scope. */
1296 DECL_CHAIN (p
) = BLOCK_VARS (block
);
1297 BLOCK_VARS (block
) = p
;
1299 else if (VAR_OR_FUNCTION_DECL_P (p
) && scope
!= file_scope
)
1301 /* For block local externs add a special
1302 DECL_EXTERNAL decl for debug info generation. */
1303 tree extp
= copy_node (p
);
1305 DECL_EXTERNAL (extp
) = 1;
1306 TREE_STATIC (extp
) = 0;
1307 TREE_PUBLIC (extp
) = 1;
1308 DECL_INITIAL (extp
) = NULL_TREE
;
1309 DECL_LANG_SPECIFIC (extp
) = NULL
;
1310 DECL_CONTEXT (extp
) = current_function_decl
;
1311 if (TREE_CODE (p
) == FUNCTION_DECL
)
1313 DECL_RESULT (extp
) = NULL_TREE
;
1314 DECL_SAVED_TREE (extp
) = NULL_TREE
;
1315 DECL_STRUCT_FUNCTION (extp
) = NULL
;
1317 if (b
->locus
!= UNKNOWN_LOCATION
)
1318 DECL_SOURCE_LOCATION (extp
) = b
->locus
;
1319 DECL_CHAIN (extp
) = BLOCK_VARS (block
);
1320 BLOCK_VARS (block
) = extp
;
1322 /* If this is the file scope set DECL_CONTEXT of each decl to
1323 the TRANSLATION_UNIT_DECL. This makes same_translation_unit_p
1325 if (scope
== file_scope
)
1327 DECL_CONTEXT (p
) = context
;
1328 if (TREE_CODE (p
) == TYPE_DECL
1329 && TREE_TYPE (p
) != error_mark_node
)
1330 set_type_context (TREE_TYPE (p
), context
);
1334 /* Parameters go in DECL_ARGUMENTS, not BLOCK_VARS, and have
1335 already been put there by store_parm_decls. Unused-
1336 parameter warnings are handled by function.c.
1337 error_mark_node obviously does not go in BLOCK_VARS and
1338 does not get unused-variable warnings. */
1341 /* It is possible for a decl not to have a name. We get
1342 here with b->id NULL in this case. */
1345 gcc_assert (I_SYMBOL_BINDING (b
->id
) == b
);
1346 I_SYMBOL_BINDING (b
->id
) = b
->shadowed
;
1347 if (b
->shadowed
&& b
->shadowed
->u
.type
)
1348 TREE_TYPE (b
->shadowed
->decl
) = b
->shadowed
->u
.type
;
1358 /* Dispose of the block that we just made inside some higher level. */
1359 if ((scope
->function_body
|| scope
== file_scope
) && context
)
1361 DECL_INITIAL (context
) = block
;
1362 BLOCK_SUPERCONTEXT (block
) = context
;
1364 else if (scope
->outer
)
1367 SCOPE_LIST_APPEND (scope
->outer
, blocks
, block
);
1368 /* If we did not make a block for the scope just exited, any
1369 blocks made for inner scopes must be carried forward so they
1370 will later become subblocks of something else. */
1371 else if (scope
->blocks
)
1372 SCOPE_LIST_CONCAT (scope
->outer
, blocks
, scope
, blocks
);
1375 /* Pop the current scope, and free the structure for reuse. */
1376 current_scope
= scope
->outer
;
1377 if (scope
->function_body
)
1378 current_function_scope
= scope
->outer_function
;
1380 memset (scope
, 0, sizeof (struct c_scope
));
1381 scope
->outer
= scope_freelist
;
1382 scope_freelist
= scope
;
1388 push_file_scope (void)
1396 file_scope
= current_scope
;
1398 start_fname_decls ();
1400 for (decl
= visible_builtins
; decl
; decl
= DECL_CHAIN (decl
))
1401 bind (DECL_NAME (decl
), decl
, file_scope
,
1402 /*invisible=*/false, /*nested=*/true, DECL_SOURCE_LOCATION (decl
));
1406 pop_file_scope (void)
1408 /* In case there were missing closebraces, get us back to the global
1410 while (current_scope
!= file_scope
)
1413 /* __FUNCTION__ is defined at file scope (""). This
1414 call may not be necessary as my tests indicate it
1415 still works without it. */
1416 finish_fname_decls ();
1418 check_inline_statics ();
1420 /* This is the point to write out a PCH if we're doing that.
1421 In that case we do not want to do anything else. */
1424 c_common_write_pch ();
1425 /* Ensure even the callers don't try to finalize the CU. */
1426 flag_syntax_only
= 1;
1430 /* Pop off the file scope and close this translation unit. */
1434 maybe_apply_pending_pragma_weaks ();
1437 /* Adjust the bindings for the start of a statement expression. */
1440 c_bindings_start_stmt_expr (struct c_spot_bindings
* switch_bindings
)
1442 struct c_scope
*scope
;
1444 for (scope
= current_scope
; scope
!= NULL
; scope
= scope
->outer
)
1446 struct c_binding
*b
;
1448 if (!scope
->has_label_bindings
)
1451 for (b
= scope
->bindings
; b
!= NULL
; b
= b
->prev
)
1453 struct c_label_vars
*label_vars
;
1455 struct c_goto_bindings
*g
;
1457 if (TREE_CODE (b
->decl
) != LABEL_DECL
)
1459 label_vars
= b
->u
.label
;
1460 ++label_vars
->label_bindings
.stmt_exprs
;
1461 FOR_EACH_VEC_SAFE_ELT (label_vars
->gotos
, ix
, g
)
1462 ++g
->goto_bindings
.stmt_exprs
;
1466 if (switch_bindings
!= NULL
)
1467 ++switch_bindings
->stmt_exprs
;
1470 /* Adjust the bindings for the end of a statement expression. */
1473 c_bindings_end_stmt_expr (struct c_spot_bindings
*switch_bindings
)
1475 struct c_scope
*scope
;
1477 for (scope
= current_scope
; scope
!= NULL
; scope
= scope
->outer
)
1479 struct c_binding
*b
;
1481 if (!scope
->has_label_bindings
)
1484 for (b
= scope
->bindings
; b
!= NULL
; b
= b
->prev
)
1486 struct c_label_vars
*label_vars
;
1488 struct c_goto_bindings
*g
;
1490 if (TREE_CODE (b
->decl
) != LABEL_DECL
)
1492 label_vars
= b
->u
.label
;
1493 --label_vars
->label_bindings
.stmt_exprs
;
1494 if (label_vars
->label_bindings
.stmt_exprs
< 0)
1496 label_vars
->label_bindings
.left_stmt_expr
= true;
1497 label_vars
->label_bindings
.stmt_exprs
= 0;
1499 FOR_EACH_VEC_SAFE_ELT (label_vars
->gotos
, ix
, g
)
1501 --g
->goto_bindings
.stmt_exprs
;
1502 if (g
->goto_bindings
.stmt_exprs
< 0)
1504 g
->goto_bindings
.left_stmt_expr
= true;
1505 g
->goto_bindings
.stmt_exprs
= 0;
1511 if (switch_bindings
!= NULL
)
1513 --switch_bindings
->stmt_exprs
;
1514 gcc_assert (switch_bindings
->stmt_exprs
>= 0);
1518 /* Push a definition or a declaration of struct, union or enum tag "name".
1519 "type" should be the type node.
1520 We assume that the tag "name" is not already defined, and has a location
1523 Note that the definition may really be just a forward reference.
1524 In that case, the TYPE_SIZE will be zero. */
1527 pushtag (location_t loc
, tree name
, tree type
)
1529 /* Record the identifier as the type's name if it has none. */
1530 if (name
&& !TYPE_NAME (type
))
1531 TYPE_NAME (type
) = name
;
1532 bind (name
, type
, current_scope
, /*invisible=*/false, /*nested=*/false, loc
);
1534 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1535 tagged type we just added to the current scope. This fake
1536 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1537 to output a representation of a tagged type, and it also gives
1538 us a convenient place to record the "scope start" address for the
1541 TYPE_STUB_DECL (type
) = pushdecl (build_decl (loc
,
1542 TYPE_DECL
, NULL_TREE
, type
));
1544 /* An approximation for now, so we can tell this is a function-scope tag.
1545 This will be updated in pop_scope. */
1546 TYPE_CONTEXT (type
) = DECL_CONTEXT (TYPE_STUB_DECL (type
));
1548 if (warn_cxx_compat
&& name
!= NULL_TREE
)
1550 struct c_binding
*b
= I_SYMBOL_BINDING (name
);
1553 && b
->decl
!= NULL_TREE
1554 && TREE_CODE (b
->decl
) == TYPE_DECL
1555 && (B_IN_CURRENT_SCOPE (b
)
1556 || (current_scope
== file_scope
&& B_IN_EXTERNAL_SCOPE (b
)))
1557 && (TYPE_MAIN_VARIANT (TREE_TYPE (b
->decl
))
1558 != TYPE_MAIN_VARIANT (type
)))
1560 if (warning_at (loc
, OPT_Wc___compat
,
1561 ("using %qD as both a typedef and a tag is "
1562 "invalid in C++"), b
->decl
)
1563 && b
->locus
!= UNKNOWN_LOCATION
)
1564 inform (b
->locus
, "originally defined here");
1569 /* An exported interface to pushtag. This is used by the gdb plugin's
1570 binding oracle to introduce a new tag binding. */
1573 c_pushtag (location_t loc
, tree name
, tree type
)
1575 pushtag (loc
, name
, type
);
1578 /* An exported interface to bind a declaration. LOC is the location
1579 to use. DECL is the declaration to bind. The decl's name is used
1580 to determine how it is bound. If DECL is a VAR_DECL, then
1581 IS_GLOBAL determines whether the decl is put into the global (file
1582 and external) scope or the current function's scope; if DECL is not
1583 a VAR_DECL then it is always put into the file scope. */
1586 c_bind (location_t loc
, tree decl
, bool is_global
)
1588 struct c_scope
*scope
;
1589 bool nested
= false;
1591 if (!VAR_P (decl
) || current_function_scope
== NULL
)
1593 /* Types and functions are always considered to be global. */
1595 DECL_EXTERNAL (decl
) = 1;
1596 TREE_PUBLIC (decl
) = 1;
1600 /* Also bind it into the external scope. */
1601 bind (DECL_NAME (decl
), decl
, external_scope
, true, false, loc
);
1604 DECL_EXTERNAL (decl
) = 1;
1605 TREE_PUBLIC (decl
) = 1;
1609 DECL_CONTEXT (decl
) = current_function_decl
;
1610 TREE_PUBLIC (decl
) = 0;
1611 scope
= current_function_scope
;
1614 bind (DECL_NAME (decl
), decl
, scope
, false, nested
, loc
);
1617 /* Subroutine of compare_decls. Allow harmless mismatches in return
1618 and argument types provided that the type modes match. This function
1619 return a unified type given a suitable match, and 0 otherwise. */
1622 match_builtin_function_types (tree newtype
, tree oldtype
)
1624 tree newrettype
, oldrettype
;
1625 tree newargs
, oldargs
;
1626 tree trytype
, tryargs
;
1628 /* Accept the return type of the new declaration if same modes. */
1629 oldrettype
= TREE_TYPE (oldtype
);
1630 newrettype
= TREE_TYPE (newtype
);
1632 if (TYPE_MODE (oldrettype
) != TYPE_MODE (newrettype
))
1635 oldargs
= TYPE_ARG_TYPES (oldtype
);
1636 newargs
= TYPE_ARG_TYPES (newtype
);
1639 while (oldargs
|| newargs
)
1643 || !TREE_VALUE (oldargs
)
1644 || !TREE_VALUE (newargs
)
1645 || TYPE_MODE (TREE_VALUE (oldargs
))
1646 != TYPE_MODE (TREE_VALUE (newargs
)))
1649 oldargs
= TREE_CHAIN (oldargs
);
1650 newargs
= TREE_CHAIN (newargs
);
1653 trytype
= build_function_type (newrettype
, tryargs
);
1655 /* Allow declaration to change transaction_safe attribute. */
1656 tree oldattrs
= TYPE_ATTRIBUTES (oldtype
);
1657 tree oldtsafe
= lookup_attribute ("transaction_safe", oldattrs
);
1658 tree newattrs
= TYPE_ATTRIBUTES (newtype
);
1659 tree newtsafe
= lookup_attribute ("transaction_safe", newattrs
);
1660 if (oldtsafe
&& !newtsafe
)
1661 oldattrs
= remove_attribute ("transaction_safe", oldattrs
);
1662 else if (newtsafe
&& !oldtsafe
)
1663 oldattrs
= tree_cons (get_identifier ("transaction_safe"),
1664 NULL_TREE
, oldattrs
);
1666 return build_type_attribute_variant (trytype
, oldattrs
);
1669 /* Subroutine of diagnose_mismatched_decls. Check for function type
1670 mismatch involving an empty arglist vs a nonempty one and give clearer
1673 diagnose_arglist_conflict (tree newdecl
, tree olddecl
,
1674 tree newtype
, tree oldtype
)
1678 if (TREE_CODE (olddecl
) != FUNCTION_DECL
1679 || !comptypes (TREE_TYPE (oldtype
), TREE_TYPE (newtype
))
1680 || !((!prototype_p (oldtype
) && DECL_INITIAL (olddecl
) == NULL_TREE
)
1681 || (!prototype_p (newtype
) && DECL_INITIAL (newdecl
) == NULL_TREE
)))
1684 t
= TYPE_ARG_TYPES (oldtype
);
1686 t
= TYPE_ARG_TYPES (newtype
);
1687 for (; t
; t
= TREE_CHAIN (t
))
1689 tree type
= TREE_VALUE (t
);
1691 if (TREE_CHAIN (t
) == NULL_TREE
1692 && TYPE_MAIN_VARIANT (type
) != void_type_node
)
1694 inform (input_location
, "a parameter list with an ellipsis can%'t match "
1695 "an empty parameter name list declaration");
1699 if (c_type_promotes_to (type
) != type
)
1701 inform (input_location
, "an argument type that has a default promotion can%'t match "
1702 "an empty parameter name list declaration");
1708 /* Another subroutine of diagnose_mismatched_decls. OLDDECL is an
1709 old-style function definition, NEWDECL is a prototype declaration.
1710 Diagnose inconsistencies in the argument list. Returns TRUE if
1711 the prototype is compatible, FALSE if not. */
1713 validate_proto_after_old_defn (tree newdecl
, tree newtype
, tree oldtype
)
1715 tree newargs
, oldargs
;
1718 #define END_OF_ARGLIST(t) ((t) == void_type_node)
1720 oldargs
= TYPE_ACTUAL_ARG_TYPES (oldtype
);
1721 newargs
= TYPE_ARG_TYPES (newtype
);
1726 tree oldargtype
= TREE_VALUE (oldargs
);
1727 tree newargtype
= TREE_VALUE (newargs
);
1729 if (oldargtype
== error_mark_node
|| newargtype
== error_mark_node
)
1732 oldargtype
= (TYPE_ATOMIC (oldargtype
)
1733 ? c_build_qualified_type (TYPE_MAIN_VARIANT (oldargtype
),
1735 : TYPE_MAIN_VARIANT (oldargtype
));
1736 newargtype
= (TYPE_ATOMIC (newargtype
)
1737 ? c_build_qualified_type (TYPE_MAIN_VARIANT (newargtype
),
1739 : TYPE_MAIN_VARIANT (newargtype
));
1741 if (END_OF_ARGLIST (oldargtype
) && END_OF_ARGLIST (newargtype
))
1744 /* Reaching the end of just one list means the two decls don't
1745 agree on the number of arguments. */
1746 if (END_OF_ARGLIST (oldargtype
))
1748 error ("prototype for %q+D declares more arguments "
1749 "than previous old-style definition", newdecl
);
1752 else if (END_OF_ARGLIST (newargtype
))
1754 error ("prototype for %q+D declares fewer arguments "
1755 "than previous old-style definition", newdecl
);
1759 /* Type for passing arg must be consistent with that declared
1761 else if (!comptypes (oldargtype
, newargtype
))
1763 error ("prototype for %q+D declares argument %d"
1764 " with incompatible type",
1769 oldargs
= TREE_CHAIN (oldargs
);
1770 newargs
= TREE_CHAIN (newargs
);
1774 /* If we get here, no errors were found, but do issue a warning
1775 for this poor-style construct. */
1776 warning (0, "prototype for %q+D follows non-prototype definition",
1779 #undef END_OF_ARGLIST
1782 /* Subroutine of diagnose_mismatched_decls. Report the location of DECL,
1783 first in a pair of mismatched declarations, using the diagnostic
1786 locate_old_decl (tree decl
)
1788 if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_BUILT_IN (decl
)
1789 && !C_DECL_DECLARED_BUILTIN (decl
))
1791 else if (DECL_INITIAL (decl
))
1792 inform (input_location
, "previous definition of %q+D was here", decl
);
1793 else if (C_DECL_IMPLICIT (decl
))
1794 inform (input_location
, "previous implicit declaration of %q+D was here", decl
);
1796 inform (input_location
, "previous declaration of %q+D was here", decl
);
1799 /* Subroutine of duplicate_decls. Compare NEWDECL to OLDDECL.
1800 Returns true if the caller should proceed to merge the two, false
1801 if OLDDECL should simply be discarded. As a side effect, issues
1802 all necessary diagnostics for invalid or poor-style combinations.
1803 If it returns true, writes the types of NEWDECL and OLDDECL to
1804 *NEWTYPEP and *OLDTYPEP - these may have been adjusted from
1805 TREE_TYPE (NEWDECL, OLDDECL) respectively. */
1808 diagnose_mismatched_decls (tree newdecl
, tree olddecl
,
1809 tree
*newtypep
, tree
*oldtypep
)
1811 tree newtype
, oldtype
;
1812 bool pedwarned
= false;
1813 bool warned
= false;
1816 #define DECL_EXTERN_INLINE(DECL) (DECL_DECLARED_INLINE_P (DECL) \
1817 && DECL_EXTERNAL (DECL))
1819 /* If we have error_mark_node for either decl or type, just discard
1820 the previous decl - we're in an error cascade already. */
1821 if (olddecl
== error_mark_node
|| newdecl
== error_mark_node
)
1823 *oldtypep
= oldtype
= TREE_TYPE (olddecl
);
1824 *newtypep
= newtype
= TREE_TYPE (newdecl
);
1825 if (oldtype
== error_mark_node
|| newtype
== error_mark_node
)
1828 /* Two different categories of symbol altogether. This is an error
1829 unless OLDDECL is a builtin. OLDDECL will be discarded in any case. */
1830 if (TREE_CODE (olddecl
) != TREE_CODE (newdecl
))
1832 if (!(TREE_CODE (olddecl
) == FUNCTION_DECL
1833 && DECL_BUILT_IN (olddecl
)
1834 && !C_DECL_DECLARED_BUILTIN (olddecl
)))
1836 error ("%q+D redeclared as different kind of symbol", newdecl
);
1837 locate_old_decl (olddecl
);
1839 else if (TREE_PUBLIC (newdecl
))
1840 warning (0, "built-in function %q+D declared as non-function",
1843 warning (OPT_Wshadow
, "declaration of %q+D shadows "
1844 "a built-in function", newdecl
);
1848 /* Enumerators have no linkage, so may only be declared once in a
1850 if (TREE_CODE (olddecl
) == CONST_DECL
)
1852 error ("redeclaration of enumerator %q+D", newdecl
);
1853 locate_old_decl (olddecl
);
1857 if (!comptypes (oldtype
, newtype
))
1859 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1860 && DECL_BUILT_IN (olddecl
) && !C_DECL_DECLARED_BUILTIN (olddecl
))
1862 /* Accept harmless mismatch in function types.
1863 This is for the ffs and fprintf builtins. */
1864 tree trytype
= match_builtin_function_types (newtype
, oldtype
);
1866 if (trytype
&& comptypes (newtype
, trytype
))
1867 *oldtypep
= oldtype
= trytype
;
1870 /* If types don't match for a built-in, throw away the
1871 built-in. No point in calling locate_old_decl here, it
1872 won't print anything. */
1873 warning (OPT_Wbuiltin_declaration_mismatch
,
1874 "conflicting types for built-in function %q+D",
1879 else if (TREE_CODE (olddecl
) == FUNCTION_DECL
1880 && DECL_IS_BUILTIN (olddecl
))
1882 /* A conflicting function declaration for a predeclared
1883 function that isn't actually built in. Objective C uses
1884 these. The new declaration silently overrides everything
1885 but the volatility (i.e. noreturn) indication. See also
1886 below. FIXME: Make Objective C use normal builtins. */
1887 TREE_THIS_VOLATILE (newdecl
) |= TREE_THIS_VOLATILE (olddecl
);
1890 /* Permit void foo (...) to match int foo (...) if the latter is
1891 the definition and implicit int was used. See
1892 c-torture/compile/920625-2.c. */
1893 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
&& DECL_INITIAL (newdecl
)
1894 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype
)) == void_type_node
1895 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype
)) == integer_type_node
1896 && C_FUNCTION_IMPLICIT_INT (newdecl
) && !DECL_INITIAL (olddecl
))
1898 pedwarned
= pedwarn (input_location
, 0,
1899 "conflicting types for %q+D", newdecl
);
1900 /* Make sure we keep void as the return type. */
1901 TREE_TYPE (newdecl
) = *newtypep
= newtype
= oldtype
;
1902 C_FUNCTION_IMPLICIT_INT (newdecl
) = 0;
1904 /* Permit void foo (...) to match an earlier call to foo (...) with
1905 no declared type (thus, implicitly int). */
1906 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
1907 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype
)) == void_type_node
1908 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype
)) == integer_type_node
1909 && C_DECL_IMPLICIT (olddecl
) && !DECL_INITIAL (olddecl
))
1911 pedwarned
= pedwarn (input_location
, 0,
1912 "conflicting types for %q+D", newdecl
);
1913 /* Make sure we keep void as the return type. */
1914 TREE_TYPE (olddecl
) = *oldtypep
= oldtype
= newtype
;
1918 int new_quals
= TYPE_QUALS (newtype
);
1919 int old_quals
= TYPE_QUALS (oldtype
);
1921 if (new_quals
!= old_quals
)
1923 addr_space_t new_addr
= DECODE_QUAL_ADDR_SPACE (new_quals
);
1924 addr_space_t old_addr
= DECODE_QUAL_ADDR_SPACE (old_quals
);
1925 if (new_addr
!= old_addr
)
1927 if (ADDR_SPACE_GENERIC_P (new_addr
))
1928 error ("conflicting named address spaces (generic vs %s) "
1930 c_addr_space_name (old_addr
), newdecl
);
1931 else if (ADDR_SPACE_GENERIC_P (old_addr
))
1932 error ("conflicting named address spaces (%s vs generic) "
1934 c_addr_space_name (new_addr
), newdecl
);
1936 error ("conflicting named address spaces (%s vs %s) "
1938 c_addr_space_name (new_addr
),
1939 c_addr_space_name (old_addr
),
1943 if (CLEAR_QUAL_ADDR_SPACE (new_quals
)
1944 != CLEAR_QUAL_ADDR_SPACE (old_quals
))
1945 error ("conflicting type qualifiers for %q+D", newdecl
);
1948 error ("conflicting types for %q+D", newdecl
);
1949 diagnose_arglist_conflict (newdecl
, olddecl
, newtype
, oldtype
);
1950 locate_old_decl (olddecl
);
1955 /* Redeclaration of a type is a constraint violation (6.7.2.3p1),
1956 but silently ignore the redeclaration if either is in a system
1957 header. (Conflicting redeclarations were handled above.) This
1958 is allowed for C11 if the types are the same, not just
1960 if (TREE_CODE (newdecl
) == TYPE_DECL
)
1962 bool types_different
= false;
1963 int comptypes_result
;
1966 = comptypes_check_different_types (oldtype
, newtype
, &types_different
);
1968 if (comptypes_result
!= 1 || types_different
)
1970 error ("redefinition of typedef %q+D with different type", newdecl
);
1971 locate_old_decl (olddecl
);
1975 if (DECL_IN_SYSTEM_HEADER (newdecl
)
1976 || DECL_IN_SYSTEM_HEADER (olddecl
)
1977 || TREE_NO_WARNING (newdecl
)
1978 || TREE_NO_WARNING (olddecl
))
1979 return true; /* Allow OLDDECL to continue in use. */
1981 if (variably_modified_type_p (newtype
, NULL
))
1983 error ("redefinition of typedef %q+D with variably modified type",
1985 locate_old_decl (olddecl
);
1987 else if (pedwarn_c99 (input_location
, OPT_Wpedantic
,
1988 "redefinition of typedef %q+D", newdecl
))
1989 locate_old_decl (olddecl
);
1994 /* Function declarations can either be 'static' or 'extern' (no
1995 qualifier is equivalent to 'extern' - C99 6.2.2p5) and therefore
1996 can never conflict with each other on account of linkage
1997 (6.2.2p4). Multiple definitions are not allowed (6.9p3,5) but
1998 gnu89 mode permits two definitions if one is 'extern inline' and
1999 one is not. The non- extern-inline definition supersedes the
2000 extern-inline definition. */
2002 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2004 /* If you declare a built-in function name as static, or
2005 define the built-in with an old-style definition (so we
2006 can't validate the argument list) the built-in definition is
2007 overridden, but optionally warn this was a bad choice of name. */
2008 if (DECL_BUILT_IN (olddecl
)
2009 && !C_DECL_DECLARED_BUILTIN (olddecl
)
2010 && (!TREE_PUBLIC (newdecl
)
2011 || (DECL_INITIAL (newdecl
)
2012 && !prototype_p (TREE_TYPE (newdecl
)))))
2014 warning (OPT_Wshadow
, "declaration of %q+D shadows "
2015 "a built-in function", newdecl
);
2016 /* Discard the old built-in function. */
2020 if (DECL_INITIAL (newdecl
))
2022 if (DECL_INITIAL (olddecl
))
2024 /* If both decls are in the same TU and the new declaration
2025 isn't overriding an extern inline reject the new decl.
2026 In c99, no overriding is allowed in the same translation
2028 if ((!DECL_EXTERN_INLINE (olddecl
)
2029 || DECL_EXTERN_INLINE (newdecl
)
2030 || (!flag_gnu89_inline
2031 && (!DECL_DECLARED_INLINE_P (olddecl
)
2032 || !lookup_attribute ("gnu_inline",
2033 DECL_ATTRIBUTES (olddecl
)))
2034 && (!DECL_DECLARED_INLINE_P (newdecl
)
2035 || !lookup_attribute ("gnu_inline",
2036 DECL_ATTRIBUTES (newdecl
))))
2038 && same_translation_unit_p (newdecl
, olddecl
))
2040 error ("redefinition of %q+D", newdecl
);
2041 locate_old_decl (olddecl
);
2046 /* If we have a prototype after an old-style function definition,
2047 the argument types must be checked specially. */
2048 else if (DECL_INITIAL (olddecl
)
2049 && !prototype_p (oldtype
) && prototype_p (newtype
)
2050 && TYPE_ACTUAL_ARG_TYPES (oldtype
)
2051 && !validate_proto_after_old_defn (newdecl
, newtype
, oldtype
))
2053 locate_old_decl (olddecl
);
2056 /* A non-static declaration (even an "extern") followed by a
2057 static declaration is undefined behavior per C99 6.2.2p3-5,7.
2058 The same is true for a static forward declaration at block
2059 scope followed by a non-static declaration/definition at file
2060 scope. Static followed by non-static at the same scope is
2061 not undefined behavior, and is the most convenient way to get
2062 some effects (see e.g. what unwind-dw2-fde-glibc.c does to
2063 the definition of _Unwind_Find_FDE in unwind-dw2-fde.c), but
2064 we do diagnose it if -Wtraditional. */
2065 if (TREE_PUBLIC (olddecl
) && !TREE_PUBLIC (newdecl
))
2067 /* Two exceptions to the rule. If olddecl is an extern
2068 inline, or a predeclared function that isn't actually
2069 built in, newdecl silently overrides olddecl. The latter
2070 occur only in Objective C; see also above. (FIXME: Make
2071 Objective C use normal builtins.) */
2072 if (!DECL_IS_BUILTIN (olddecl
)
2073 && !DECL_EXTERN_INLINE (olddecl
))
2075 error ("static declaration of %q+D follows "
2076 "non-static declaration", newdecl
);
2077 locate_old_decl (olddecl
);
2081 else if (TREE_PUBLIC (newdecl
) && !TREE_PUBLIC (olddecl
))
2083 if (DECL_CONTEXT (olddecl
))
2085 error ("non-static declaration of %q+D follows "
2086 "static declaration", newdecl
);
2087 locate_old_decl (olddecl
);
2090 else if (warn_traditional
)
2092 warned
|= warning (OPT_Wtraditional
,
2093 "non-static declaration of %q+D "
2094 "follows static declaration", newdecl
);
2098 /* Make sure gnu_inline attribute is either not present, or
2099 present on all inline decls. */
2100 if (DECL_DECLARED_INLINE_P (olddecl
)
2101 && DECL_DECLARED_INLINE_P (newdecl
))
2103 bool newa
= lookup_attribute ("gnu_inline",
2104 DECL_ATTRIBUTES (newdecl
)) != NULL
;
2105 bool olda
= lookup_attribute ("gnu_inline",
2106 DECL_ATTRIBUTES (olddecl
)) != NULL
;
2109 error_at (input_location
, "%<gnu_inline%> attribute present on %q+D",
2110 newa
? newdecl
: olddecl
);
2111 error_at (DECL_SOURCE_LOCATION (newa
? olddecl
: newdecl
),
2116 else if (VAR_P (newdecl
))
2118 /* Only variables can be thread-local, and all declarations must
2119 agree on this property. */
2120 if (C_DECL_THREADPRIVATE_P (olddecl
) && !DECL_THREAD_LOCAL_P (newdecl
))
2122 /* Nothing to check. Since OLDDECL is marked threadprivate
2123 and NEWDECL does not have a thread-local attribute, we
2124 will merge the threadprivate attribute into NEWDECL. */
2127 else if (DECL_THREAD_LOCAL_P (newdecl
) != DECL_THREAD_LOCAL_P (olddecl
))
2129 if (DECL_THREAD_LOCAL_P (newdecl
))
2130 error ("thread-local declaration of %q+D follows "
2131 "non-thread-local declaration", newdecl
);
2133 error ("non-thread-local declaration of %q+D follows "
2134 "thread-local declaration", newdecl
);
2136 locate_old_decl (olddecl
);
2140 /* Multiple initialized definitions are not allowed (6.9p3,5). */
2141 if (DECL_INITIAL (newdecl
) && DECL_INITIAL (olddecl
))
2143 error ("redefinition of %q+D", newdecl
);
2144 locate_old_decl (olddecl
);
2148 /* Objects declared at file scope: if the first declaration had
2149 external linkage (even if it was an external reference) the
2150 second must have external linkage as well, or the behavior is
2151 undefined. If the first declaration had internal linkage, then
2152 the second must too, or else be an external reference (in which
2153 case the composite declaration still has internal linkage).
2154 As for function declarations, we warn about the static-then-
2155 extern case only for -Wtraditional. See generally 6.2.2p3-5,7. */
2156 if (DECL_FILE_SCOPE_P (newdecl
)
2157 && TREE_PUBLIC (newdecl
) != TREE_PUBLIC (olddecl
))
2159 if (DECL_EXTERNAL (newdecl
))
2161 if (!DECL_FILE_SCOPE_P (olddecl
))
2163 error ("extern declaration of %q+D follows "
2164 "declaration with no linkage", newdecl
);
2165 locate_old_decl (olddecl
);
2168 else if (warn_traditional
)
2170 warned
|= warning (OPT_Wtraditional
,
2171 "non-static declaration of %q+D "
2172 "follows static declaration", newdecl
);
2177 if (TREE_PUBLIC (newdecl
))
2178 error ("non-static declaration of %q+D follows "
2179 "static declaration", newdecl
);
2181 error ("static declaration of %q+D follows "
2182 "non-static declaration", newdecl
);
2184 locate_old_decl (olddecl
);
2188 /* Two objects with the same name declared at the same block
2189 scope must both be external references (6.7p3). */
2190 else if (!DECL_FILE_SCOPE_P (newdecl
))
2192 if (DECL_EXTERNAL (newdecl
))
2194 /* Extern with initializer at block scope, which will
2195 already have received an error. */
2197 else if (DECL_EXTERNAL (olddecl
))
2199 error ("declaration of %q+D with no linkage follows "
2200 "extern declaration", newdecl
);
2201 locate_old_decl (olddecl
);
2205 error ("redeclaration of %q+D with no linkage", newdecl
);
2206 locate_old_decl (olddecl
);
2212 /* C++ does not permit a decl to appear multiple times at file
2215 && DECL_FILE_SCOPE_P (newdecl
)
2216 && !DECL_EXTERNAL (newdecl
)
2217 && !DECL_EXTERNAL (olddecl
))
2218 warned
|= warning_at (DECL_SOURCE_LOCATION (newdecl
),
2220 ("duplicate declaration of %qD is "
2226 /* All decls must agree on a visibility. */
2227 if (CODE_CONTAINS_STRUCT (TREE_CODE (newdecl
), TS_DECL_WITH_VIS
)
2228 && DECL_VISIBILITY_SPECIFIED (newdecl
) && DECL_VISIBILITY_SPECIFIED (olddecl
)
2229 && DECL_VISIBILITY (newdecl
) != DECL_VISIBILITY (olddecl
))
2231 warned
|= warning (0, "redeclaration of %q+D with different visibility "
2232 "(old visibility preserved)", newdecl
);
2235 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2236 warned
|= diagnose_mismatched_attributes (olddecl
, newdecl
);
2237 else /* PARM_DECL, VAR_DECL */
2239 /* Redeclaration of a parameter is a constraint violation (this is
2240 not explicitly stated, but follows from C99 6.7p3 [no more than
2241 one declaration of the same identifier with no linkage in the
2242 same scope, except type tags] and 6.2.2p6 [parameters have no
2243 linkage]). We must check for a forward parameter declaration,
2244 indicated by TREE_ASM_WRITTEN on the old declaration - this is
2245 an extension, the mandatory diagnostic for which is handled by
2246 mark_forward_parm_decls. */
2248 if (TREE_CODE (newdecl
) == PARM_DECL
2249 && (!TREE_ASM_WRITTEN (olddecl
) || TREE_ASM_WRITTEN (newdecl
)))
2251 error ("redefinition of parameter %q+D", newdecl
);
2252 locate_old_decl (olddecl
);
2257 /* Optional warning for completely redundant decls. */
2258 if (!warned
&& !pedwarned
2259 && warn_redundant_decls
2260 /* Don't warn about a function declaration followed by a
2262 && !(TREE_CODE (newdecl
) == FUNCTION_DECL
2263 && DECL_INITIAL (newdecl
) && !DECL_INITIAL (olddecl
))
2264 /* Don't warn about redundant redeclarations of builtins. */
2265 && !(TREE_CODE (newdecl
) == FUNCTION_DECL
2266 && !DECL_BUILT_IN (newdecl
)
2267 && DECL_BUILT_IN (olddecl
)
2268 && !C_DECL_DECLARED_BUILTIN (olddecl
))
2269 /* Don't warn about an extern followed by a definition. */
2270 && !(DECL_EXTERNAL (olddecl
) && !DECL_EXTERNAL (newdecl
))
2271 /* Don't warn about forward parameter decls. */
2272 && !(TREE_CODE (newdecl
) == PARM_DECL
2273 && TREE_ASM_WRITTEN (olddecl
) && !TREE_ASM_WRITTEN (newdecl
))
2274 /* Don't warn about a variable definition following a declaration. */
2275 && !(VAR_P (newdecl
)
2276 && DECL_INITIAL (newdecl
) && !DECL_INITIAL (olddecl
)))
2278 warned
= warning (OPT_Wredundant_decls
, "redundant redeclaration of %q+D",
2282 /* Report location of previous decl/defn. */
2283 if (warned
|| pedwarned
)
2284 locate_old_decl (olddecl
);
2286 #undef DECL_EXTERN_INLINE
2291 /* Subroutine of duplicate_decls. NEWDECL has been found to be
2292 consistent with OLDDECL, but carries new information. Merge the
2293 new information into OLDDECL. This function issues no
2297 merge_decls (tree newdecl
, tree olddecl
, tree newtype
, tree oldtype
)
2299 bool new_is_definition
= (TREE_CODE (newdecl
) == FUNCTION_DECL
2300 && DECL_INITIAL (newdecl
) != NULL_TREE
);
2301 bool new_is_prototype
= (TREE_CODE (newdecl
) == FUNCTION_DECL
2302 && prototype_p (TREE_TYPE (newdecl
)));
2303 bool old_is_prototype
= (TREE_CODE (olddecl
) == FUNCTION_DECL
2304 && prototype_p (TREE_TYPE (olddecl
)));
2306 /* For real parm decl following a forward decl, rechain the old decl
2307 in its new location and clear TREE_ASM_WRITTEN (it's not a
2308 forward decl anymore). */
2309 if (TREE_CODE (newdecl
) == PARM_DECL
2310 && TREE_ASM_WRITTEN (olddecl
) && !TREE_ASM_WRITTEN (newdecl
))
2312 struct c_binding
*b
, **here
;
2314 for (here
= ¤t_scope
->bindings
; *here
; here
= &(*here
)->prev
)
2315 if ((*here
)->decl
== olddecl
)
2322 b
->prev
= current_scope
->bindings
;
2323 current_scope
->bindings
= b
;
2325 TREE_ASM_WRITTEN (olddecl
) = 0;
2328 DECL_ATTRIBUTES (newdecl
)
2329 = targetm
.merge_decl_attributes (olddecl
, newdecl
);
2331 /* For typedefs use the old type, as the new type's DECL_NAME points
2332 at newdecl, which will be ggc_freed. */
2333 if (TREE_CODE (newdecl
) == TYPE_DECL
)
2335 /* But NEWTYPE might have an attribute, honor that. */
2339 if (TYPE_USER_ALIGN (tem
))
2341 if (TYPE_ALIGN (tem
) > TYPE_ALIGN (newtype
))
2342 SET_TYPE_ALIGN (newtype
, TYPE_ALIGN (tem
));
2343 TYPE_USER_ALIGN (newtype
) = true;
2346 /* And remove the new type from the variants list. */
2347 if (TYPE_NAME (TREE_TYPE (newdecl
)) == newdecl
)
2349 tree remove
= TREE_TYPE (newdecl
);
2350 for (tree t
= TYPE_MAIN_VARIANT (remove
); ;
2351 t
= TYPE_NEXT_VARIANT (t
))
2352 if (TYPE_NEXT_VARIANT (t
) == remove
)
2354 TYPE_NEXT_VARIANT (t
) = TYPE_NEXT_VARIANT (remove
);
2360 /* Merge the data types specified in the two decls. */
2362 = TREE_TYPE (olddecl
)
2363 = composite_type (newtype
, oldtype
);
2365 /* Lay the type out, unless already done. */
2366 if (!comptypes (oldtype
, TREE_TYPE (newdecl
)))
2368 if (TREE_TYPE (newdecl
) != error_mark_node
)
2369 layout_type (TREE_TYPE (newdecl
));
2370 if (TREE_CODE (newdecl
) != FUNCTION_DECL
2371 && TREE_CODE (newdecl
) != TYPE_DECL
2372 && TREE_CODE (newdecl
) != CONST_DECL
)
2373 layout_decl (newdecl
, 0);
2377 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
2378 DECL_SIZE (newdecl
) = DECL_SIZE (olddecl
);
2379 DECL_SIZE_UNIT (newdecl
) = DECL_SIZE_UNIT (olddecl
);
2380 SET_DECL_MODE (newdecl
, DECL_MODE (olddecl
));
2381 if (DECL_ALIGN (olddecl
) > DECL_ALIGN (newdecl
))
2383 SET_DECL_ALIGN (newdecl
, DECL_ALIGN (olddecl
));
2384 DECL_USER_ALIGN (newdecl
) |= DECL_USER_ALIGN (olddecl
);
2386 if (DECL_WARN_IF_NOT_ALIGN (olddecl
)
2387 > DECL_WARN_IF_NOT_ALIGN (newdecl
))
2388 SET_DECL_WARN_IF_NOT_ALIGN (newdecl
,
2389 DECL_WARN_IF_NOT_ALIGN (olddecl
));
2392 /* Keep the old rtl since we can safely use it. */
2393 if (HAS_RTL_P (olddecl
))
2394 COPY_DECL_RTL (olddecl
, newdecl
);
2396 /* Merge the type qualifiers. */
2397 if (TREE_READONLY (newdecl
))
2398 TREE_READONLY (olddecl
) = 1;
2400 if (TREE_THIS_VOLATILE (newdecl
))
2401 TREE_THIS_VOLATILE (olddecl
) = 1;
2403 /* Merge deprecatedness. */
2404 if (TREE_DEPRECATED (newdecl
))
2405 TREE_DEPRECATED (olddecl
) = 1;
2407 /* If a decl is in a system header and the other isn't, keep the one on the
2408 system header. Otherwise, keep source location of definition rather than
2409 declaration and of prototype rather than non-prototype unless that
2410 prototype is built-in. */
2411 if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl
), TS_DECL_WITH_VIS
)
2412 && DECL_IN_SYSTEM_HEADER (olddecl
)
2413 && !DECL_IN_SYSTEM_HEADER (newdecl
) )
2414 DECL_SOURCE_LOCATION (newdecl
) = DECL_SOURCE_LOCATION (olddecl
);
2415 else if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl
), TS_DECL_WITH_VIS
)
2416 && DECL_IN_SYSTEM_HEADER (newdecl
)
2417 && !DECL_IN_SYSTEM_HEADER (olddecl
))
2418 DECL_SOURCE_LOCATION (olddecl
) = DECL_SOURCE_LOCATION (newdecl
);
2419 else if ((DECL_INITIAL (newdecl
) == NULL_TREE
2420 && DECL_INITIAL (olddecl
) != NULL_TREE
)
2421 || (old_is_prototype
&& !new_is_prototype
2422 && !C_DECL_BUILTIN_PROTOTYPE (olddecl
)))
2423 DECL_SOURCE_LOCATION (newdecl
) = DECL_SOURCE_LOCATION (olddecl
);
2425 /* Merge the initialization information. */
2426 if (DECL_INITIAL (newdecl
) == NULL_TREE
)
2427 DECL_INITIAL (newdecl
) = DECL_INITIAL (olddecl
);
2429 /* Merge the threadprivate attribute. */
2430 if (VAR_P (olddecl
) && C_DECL_THREADPRIVATE_P (olddecl
))
2431 C_DECL_THREADPRIVATE_P (newdecl
) = 1;
2433 if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl
), TS_DECL_WITH_VIS
))
2435 /* Copy the assembler name.
2436 Currently, it can only be defined in the prototype. */
2437 COPY_DECL_ASSEMBLER_NAME (olddecl
, newdecl
);
2439 /* Use visibility of whichever declaration had it specified */
2440 if (DECL_VISIBILITY_SPECIFIED (olddecl
))
2442 DECL_VISIBILITY (newdecl
) = DECL_VISIBILITY (olddecl
);
2443 DECL_VISIBILITY_SPECIFIED (newdecl
) = 1;
2446 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2448 DECL_STATIC_CONSTRUCTOR(newdecl
) |= DECL_STATIC_CONSTRUCTOR(olddecl
);
2449 DECL_STATIC_DESTRUCTOR (newdecl
) |= DECL_STATIC_DESTRUCTOR (olddecl
);
2450 DECL_NO_LIMIT_STACK (newdecl
) |= DECL_NO_LIMIT_STACK (olddecl
);
2451 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl
)
2452 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl
);
2453 TREE_THIS_VOLATILE (newdecl
) |= TREE_THIS_VOLATILE (olddecl
);
2454 DECL_IS_MALLOC (newdecl
) |= DECL_IS_MALLOC (olddecl
);
2455 DECL_IS_OPERATOR_NEW (newdecl
) |= DECL_IS_OPERATOR_NEW (olddecl
);
2456 TREE_READONLY (newdecl
) |= TREE_READONLY (olddecl
);
2457 DECL_PURE_P (newdecl
) |= DECL_PURE_P (olddecl
);
2458 DECL_IS_NOVOPS (newdecl
) |= DECL_IS_NOVOPS (olddecl
);
2461 /* Merge the storage class information. */
2462 merge_weak (newdecl
, olddecl
);
2464 /* For functions, static overrides non-static. */
2465 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2467 TREE_PUBLIC (newdecl
) &= TREE_PUBLIC (olddecl
);
2468 /* This is since we don't automatically
2469 copy the attributes of NEWDECL into OLDDECL. */
2470 TREE_PUBLIC (olddecl
) = TREE_PUBLIC (newdecl
);
2471 /* If this clears `static', clear it in the identifier too. */
2472 if (!TREE_PUBLIC (olddecl
))
2473 TREE_PUBLIC (DECL_NAME (olddecl
)) = 0;
2477 /* In c99, 'extern' declaration before (or after) 'inline' means this
2478 function is not DECL_EXTERNAL, unless 'gnu_inline' attribute
2480 if (TREE_CODE (newdecl
) == FUNCTION_DECL
2481 && !flag_gnu89_inline
2482 && (DECL_DECLARED_INLINE_P (newdecl
)
2483 || DECL_DECLARED_INLINE_P (olddecl
))
2484 && (!DECL_DECLARED_INLINE_P (newdecl
)
2485 || !DECL_DECLARED_INLINE_P (olddecl
)
2486 || !DECL_EXTERNAL (olddecl
))
2487 && DECL_EXTERNAL (newdecl
)
2488 && !lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (newdecl
))
2489 && !current_function_decl
)
2490 DECL_EXTERNAL (newdecl
) = 0;
2492 /* An inline definition following a static declaration is not
2494 if (new_is_definition
2495 && (DECL_DECLARED_INLINE_P (newdecl
)
2496 || DECL_DECLARED_INLINE_P (olddecl
))
2497 && !TREE_PUBLIC (olddecl
))
2498 DECL_EXTERNAL (newdecl
) = 0;
2500 if (DECL_EXTERNAL (newdecl
))
2502 TREE_STATIC (newdecl
) = TREE_STATIC (olddecl
);
2503 DECL_EXTERNAL (newdecl
) = DECL_EXTERNAL (olddecl
);
2505 /* An extern decl does not override previous storage class. */
2506 TREE_PUBLIC (newdecl
) = TREE_PUBLIC (olddecl
);
2507 if (!DECL_EXTERNAL (newdecl
))
2509 DECL_CONTEXT (newdecl
) = DECL_CONTEXT (olddecl
);
2510 DECL_COMMON (newdecl
) = DECL_COMMON (olddecl
);
2515 TREE_STATIC (olddecl
) = TREE_STATIC (newdecl
);
2516 TREE_PUBLIC (olddecl
) = TREE_PUBLIC (newdecl
);
2519 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2521 /* If we're redefining a function previously defined as extern
2522 inline, make sure we emit debug info for the inline before we
2523 throw it away, in case it was inlined into a function that
2524 hasn't been written out yet. */
2525 if (new_is_definition
&& DECL_INITIAL (olddecl
))
2526 /* The new defn must not be inline. */
2527 DECL_UNINLINABLE (newdecl
) = 1;
2530 /* If either decl says `inline', this fn is inline, unless
2531 its definition was passed already. */
2532 if (DECL_DECLARED_INLINE_P (newdecl
)
2533 || DECL_DECLARED_INLINE_P (olddecl
))
2534 DECL_DECLARED_INLINE_P (newdecl
) = 1;
2536 DECL_UNINLINABLE (newdecl
) = DECL_UNINLINABLE (olddecl
)
2537 = (DECL_UNINLINABLE (newdecl
) || DECL_UNINLINABLE (olddecl
));
2539 DECL_DISREGARD_INLINE_LIMITS (newdecl
)
2540 = DECL_DISREGARD_INLINE_LIMITS (olddecl
)
2541 = (DECL_DISREGARD_INLINE_LIMITS (newdecl
)
2542 || DECL_DISREGARD_INLINE_LIMITS (olddecl
));
2545 if (DECL_BUILT_IN (olddecl
))
2547 /* If redeclaring a builtin function, it stays built in.
2548 But it gets tagged as having been declared. */
2549 DECL_BUILT_IN_CLASS (newdecl
) = DECL_BUILT_IN_CLASS (olddecl
);
2550 DECL_FUNCTION_CODE (newdecl
) = DECL_FUNCTION_CODE (olddecl
);
2551 C_DECL_DECLARED_BUILTIN (newdecl
) = 1;
2552 if (new_is_prototype
)
2554 C_DECL_BUILTIN_PROTOTYPE (newdecl
) = 0;
2555 if (DECL_BUILT_IN_CLASS (newdecl
) == BUILT_IN_NORMAL
)
2557 enum built_in_function fncode
= DECL_FUNCTION_CODE (newdecl
);
2560 /* If a compatible prototype of these builtin functions
2561 is seen, assume the runtime implements it with the
2562 expected semantics. */
2563 case BUILT_IN_STPCPY
:
2564 if (builtin_decl_explicit_p (fncode
))
2565 set_builtin_decl_implicit_p (fncode
, true);
2568 if (builtin_decl_explicit_p (fncode
))
2569 set_builtin_decl_declared_p (fncode
, true);
2575 C_DECL_BUILTIN_PROTOTYPE (newdecl
)
2576 = C_DECL_BUILTIN_PROTOTYPE (olddecl
);
2579 /* Preserve function specific target and optimization options */
2580 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl
)
2581 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl
))
2582 DECL_FUNCTION_SPECIFIC_TARGET (newdecl
)
2583 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl
);
2585 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl
)
2586 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl
))
2587 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl
)
2588 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl
);
2590 /* Also preserve various other info from the definition. */
2591 if (!new_is_definition
)
2594 DECL_RESULT (newdecl
) = DECL_RESULT (olddecl
);
2595 DECL_INITIAL (newdecl
) = DECL_INITIAL (olddecl
);
2596 DECL_STRUCT_FUNCTION (newdecl
) = DECL_STRUCT_FUNCTION (olddecl
);
2597 DECL_SAVED_TREE (newdecl
) = DECL_SAVED_TREE (olddecl
);
2598 DECL_ARGUMENTS (newdecl
) = copy_list (DECL_ARGUMENTS (olddecl
));
2599 for (t
= DECL_ARGUMENTS (newdecl
); t
; t
= DECL_CHAIN (t
))
2600 DECL_CONTEXT (t
) = newdecl
;
2602 /* See if we've got a function to instantiate from. */
2603 if (DECL_SAVED_TREE (olddecl
))
2604 DECL_ABSTRACT_ORIGIN (newdecl
)
2605 = DECL_ABSTRACT_ORIGIN (olddecl
);
2609 /* Merge the USED information. */
2610 if (TREE_USED (olddecl
))
2611 TREE_USED (newdecl
) = 1;
2612 else if (TREE_USED (newdecl
))
2613 TREE_USED (olddecl
) = 1;
2614 if (VAR_P (olddecl
) || TREE_CODE (olddecl
) == PARM_DECL
)
2615 DECL_READ_P (newdecl
) |= DECL_READ_P (olddecl
);
2616 if (DECL_PRESERVE_P (olddecl
))
2617 DECL_PRESERVE_P (newdecl
) = 1;
2618 else if (DECL_PRESERVE_P (newdecl
))
2619 DECL_PRESERVE_P (olddecl
) = 1;
2621 /* Merge DECL_COMMON */
2622 if (VAR_P (olddecl
) && VAR_P (newdecl
)
2623 && !lookup_attribute ("common", DECL_ATTRIBUTES (newdecl
))
2624 && !lookup_attribute ("nocommon", DECL_ATTRIBUTES (newdecl
)))
2625 DECL_COMMON (newdecl
) = DECL_COMMON (newdecl
) && DECL_COMMON (olddecl
);
2627 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
2628 But preserve OLDDECL's DECL_UID, DECL_CONTEXT and
2629 DECL_ARGUMENTS (if appropriate). */
2631 unsigned olddecl_uid
= DECL_UID (olddecl
);
2632 tree olddecl_context
= DECL_CONTEXT (olddecl
);
2633 tree olddecl_arguments
= NULL
;
2634 if (TREE_CODE (olddecl
) == FUNCTION_DECL
)
2635 olddecl_arguments
= DECL_ARGUMENTS (olddecl
);
2637 memcpy ((char *) olddecl
+ sizeof (struct tree_common
),
2638 (char *) newdecl
+ sizeof (struct tree_common
),
2639 sizeof (struct tree_decl_common
) - sizeof (struct tree_common
));
2640 DECL_USER_ALIGN (olddecl
) = DECL_USER_ALIGN (newdecl
);
2641 switch (TREE_CODE (olddecl
))
2646 struct symtab_node
*snode
= olddecl
->decl_with_vis
.symtab_node
;
2648 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
2649 (char *) newdecl
+ sizeof (struct tree_decl_common
),
2650 tree_code_size (TREE_CODE (olddecl
)) - sizeof (struct tree_decl_common
));
2651 olddecl
->decl_with_vis
.symtab_node
= snode
;
2653 if ((DECL_EXTERNAL (olddecl
)
2654 || TREE_PUBLIC (olddecl
)
2655 || TREE_STATIC (olddecl
))
2656 && DECL_SECTION_NAME (newdecl
) != NULL
)
2657 set_decl_section_name (olddecl
, DECL_SECTION_NAME (newdecl
));
2659 /* This isn't quite correct for something like
2660 int __thread x attribute ((tls_model ("local-exec")));
2661 extern int __thread x;
2662 as we'll lose the "local-exec" model. */
2663 if (VAR_P (olddecl
) && DECL_THREAD_LOCAL_P (newdecl
))
2664 set_decl_tls_model (olddecl
, DECL_TLS_MODEL (newdecl
));
2674 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
2675 (char *) newdecl
+ sizeof (struct tree_decl_common
),
2676 tree_code_size (TREE_CODE (olddecl
)) - sizeof (struct tree_decl_common
));
2681 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
2682 (char *) newdecl
+ sizeof (struct tree_decl_common
),
2683 sizeof (struct tree_decl_non_common
) - sizeof (struct tree_decl_common
));
2685 DECL_UID (olddecl
) = olddecl_uid
;
2686 DECL_CONTEXT (olddecl
) = olddecl_context
;
2687 if (TREE_CODE (olddecl
) == FUNCTION_DECL
)
2688 DECL_ARGUMENTS (olddecl
) = olddecl_arguments
;
2691 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2692 so that encode_section_info has a chance to look at the new decl
2693 flags and attributes. */
2694 if (DECL_RTL_SET_P (olddecl
)
2695 && (TREE_CODE (olddecl
) == FUNCTION_DECL
2696 || (VAR_P (olddecl
) && TREE_STATIC (olddecl
))))
2697 make_decl_rtl (olddecl
);
2700 /* Handle when a new declaration NEWDECL has the same name as an old
2701 one OLDDECL in the same binding contour. Prints an error message
2704 If safely possible, alter OLDDECL to look like NEWDECL, and return
2705 true. Otherwise, return false. */
2708 duplicate_decls (tree newdecl
, tree olddecl
)
2710 tree newtype
= NULL
, oldtype
= NULL
;
2712 if (!diagnose_mismatched_decls (newdecl
, olddecl
, &newtype
, &oldtype
))
2714 /* Avoid `unused variable' and other warnings for OLDDECL. */
2715 TREE_NO_WARNING (olddecl
) = 1;
2719 merge_decls (newdecl
, olddecl
, newtype
, oldtype
);
2721 /* The NEWDECL will no longer be needed.
2723 Before releasing the node, be sure to remove function from symbol
2724 table that might have been inserted there to record comdat group.
2725 Be sure to however do not free DECL_STRUCT_FUNCTION because this
2726 structure is shared in between NEWDECL and OLDECL. */
2727 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2728 DECL_STRUCT_FUNCTION (newdecl
) = NULL
;
2729 if (VAR_OR_FUNCTION_DECL_P (newdecl
))
2731 struct symtab_node
*snode
= symtab_node::get (newdecl
);
2740 /* Check whether decl-node NEW_DECL shadows an existing declaration. */
2742 warn_if_shadowing (tree new_decl
)
2744 struct c_binding
*b
;
2746 /* Shadow warnings wanted? */
2748 || warn_shadow_local
2749 || warn_shadow_compatible_local
)
2750 /* No shadow warnings for internally generated vars. */
2751 || DECL_IS_BUILTIN (new_decl
)
2752 /* No shadow warnings for vars made for inlining. */
2753 || DECL_FROM_INLINE (new_decl
))
2756 /* Is anything being shadowed? Invisible decls do not count. */
2757 for (b
= I_SYMBOL_BINDING (DECL_NAME (new_decl
)); b
; b
= b
->shadowed
)
2758 if (b
->decl
&& b
->decl
!= new_decl
&& !b
->invisible
2759 && (b
->decl
== error_mark_node
2760 || diagnostic_report_warnings_p (global_dc
,
2761 DECL_SOURCE_LOCATION (b
->decl
))))
2763 tree old_decl
= b
->decl
;
2764 bool warned
= false;
2766 if (old_decl
== error_mark_node
)
2768 warning (OPT_Wshadow
, "declaration of %q+D shadows previous "
2769 "non-variable", new_decl
);
2772 else if (TREE_CODE (old_decl
) == PARM_DECL
)
2774 enum opt_code warning_code
;
2776 /* If '-Wshadow=compatible-local' is specified without other
2777 -Wshadow= flags, we will warn only when the types of the
2778 shadowing variable (i.e. new_decl) and the shadowed variable
2779 (old_decl) are compatible. */
2781 warning_code
= OPT_Wshadow
;
2782 else if (comptypes (TREE_TYPE (old_decl
), TREE_TYPE (new_decl
)))
2783 warning_code
= OPT_Wshadow_compatible_local
;
2785 warning_code
= OPT_Wshadow_local
;
2786 warned
= warning_at (DECL_SOURCE_LOCATION (new_decl
), warning_code
,
2787 "declaration of %qD shadows a parameter",
2790 else if (DECL_FILE_SCOPE_P (old_decl
))
2792 /* Do not warn if a variable shadows a function, unless
2793 the variable is a function or a pointer-to-function. */
2794 if (TREE_CODE (old_decl
) == FUNCTION_DECL
2795 && TREE_CODE (new_decl
) != FUNCTION_DECL
2796 && !FUNCTION_POINTER_TYPE_P (TREE_TYPE (new_decl
)))
2799 warned
= warning_at (DECL_SOURCE_LOCATION (new_decl
), OPT_Wshadow
,
2800 "declaration of %qD shadows a global "
2804 else if (TREE_CODE (old_decl
) == FUNCTION_DECL
2805 && DECL_BUILT_IN (old_decl
))
2807 warning (OPT_Wshadow
, "declaration of %q+D shadows "
2808 "a built-in function", new_decl
);
2813 enum opt_code warning_code
;
2815 /* If '-Wshadow=compatible-local' is specified without other
2816 -Wshadow= flags, we will warn only when the types of the
2817 shadowing variable (i.e. new_decl) and the shadowed variable
2818 (old_decl) are compatible. */
2820 warning_code
= OPT_Wshadow
;
2821 else if (comptypes (TREE_TYPE (old_decl
), TREE_TYPE (new_decl
)))
2822 warning_code
= OPT_Wshadow_compatible_local
;
2824 warning_code
= OPT_Wshadow_local
;
2825 warned
= warning_at (DECL_SOURCE_LOCATION (new_decl
), warning_code
,
2826 "declaration of %qD shadows a previous local",
2831 inform (DECL_SOURCE_LOCATION (old_decl
),
2832 "shadowed declaration is here");
2838 /* Record a decl-node X as belonging to the current lexical scope.
2839 Check for errors (such as an incompatible declaration for the same
2840 name already seen in the same scope).
2842 Returns either X or an old decl for the same name.
2843 If an old decl is returned, it may have been smashed
2844 to agree with what X says. */
2849 tree name
= DECL_NAME (x
);
2850 struct c_scope
*scope
= current_scope
;
2851 struct c_binding
*b
;
2852 bool nested
= false;
2853 location_t locus
= DECL_SOURCE_LOCATION (x
);
2855 /* Must set DECL_CONTEXT for everything not at file scope or
2856 DECL_FILE_SCOPE_P won't work. Local externs don't count
2857 unless they have initializers (which generate code). */
2858 if (current_function_decl
2859 && (!VAR_OR_FUNCTION_DECL_P (x
)
2860 || DECL_INITIAL (x
) || !DECL_EXTERNAL (x
)))
2861 DECL_CONTEXT (x
) = current_function_decl
;
2863 /* Anonymous decls are just inserted in the scope. */
2866 bind (name
, x
, scope
, /*invisible=*/false, /*nested=*/false,
2871 /* First, see if there is another declaration with the same name in
2872 the current scope. If there is, duplicate_decls may do all the
2873 work for us. If duplicate_decls returns false, that indicates
2874 two incompatible decls in the same scope; we are to silently
2875 replace the old one (duplicate_decls has issued all appropriate
2876 diagnostics). In particular, we should not consider possible
2877 duplicates in the external scope, or shadowing. */
2878 b
= I_SYMBOL_BINDING (name
);
2879 if (b
&& B_IN_SCOPE (b
, scope
))
2881 struct c_binding
*b_ext
, *b_use
;
2882 tree type
= TREE_TYPE (x
);
2883 tree visdecl
= b
->decl
;
2884 tree vistype
= TREE_TYPE (visdecl
);
2885 if (TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
2886 && COMPLETE_TYPE_P (TREE_TYPE (x
)))
2887 b
->inner_comp
= false;
2890 /* If this is an external linkage declaration, we should check
2891 for compatibility with the type in the external scope before
2892 setting the type at this scope based on the visible
2893 information only. */
2894 if (TREE_PUBLIC (x
) && TREE_PUBLIC (visdecl
))
2896 while (b_ext
&& !B_IN_EXTERNAL_SCOPE (b_ext
))
2897 b_ext
= b_ext
->shadowed
;
2902 TREE_TYPE (b_use
->decl
) = b_use
->u
.type
;
2905 if (duplicate_decls (x
, b_use
->decl
))
2909 /* Save the updated type in the external scope and
2910 restore the proper type for this scope. */
2912 if (comptypes (vistype
, type
))
2913 thistype
= composite_type (vistype
, type
);
2915 thistype
= TREE_TYPE (b_use
->decl
);
2916 b_use
->u
.type
= TREE_TYPE (b_use
->decl
);
2917 if (TREE_CODE (b_use
->decl
) == FUNCTION_DECL
2918 && DECL_BUILT_IN (b_use
->decl
))
2920 = build_type_attribute_variant (thistype
,
2923 TREE_TYPE (b_use
->decl
) = thistype
;
2928 goto skip_external_and_shadow_checks
;
2931 /* All declarations with external linkage, and all external
2932 references, go in the external scope, no matter what scope is
2933 current. However, the binding in that scope is ignored for
2934 purposes of normal name lookup. A separate binding structure is
2935 created in the requested scope; this governs the normal
2936 visibility of the symbol.
2938 The binding in the externals scope is used exclusively for
2939 detecting duplicate declarations of the same object, no matter
2940 what scope they are in; this is what we do here. (C99 6.2.7p2:
2941 All declarations that refer to the same object or function shall
2942 have compatible type; otherwise, the behavior is undefined.) */
2943 if (DECL_EXTERNAL (x
) || scope
== file_scope
)
2945 tree type
= TREE_TYPE (x
);
2946 tree vistype
= NULL_TREE
;
2947 tree visdecl
= NULL_TREE
;
2948 bool type_saved
= false;
2949 if (b
&& !B_IN_EXTERNAL_SCOPE (b
)
2950 && VAR_OR_FUNCTION_DECL_P (b
->decl
)
2951 && DECL_FILE_SCOPE_P (b
->decl
))
2954 vistype
= TREE_TYPE (visdecl
);
2956 if (scope
!= file_scope
2957 && !DECL_IN_SYSTEM_HEADER (x
))
2958 warning_at (locus
, OPT_Wnested_externs
,
2959 "nested extern declaration of %qD", x
);
2961 while (b
&& !B_IN_EXTERNAL_SCOPE (b
))
2963 /* If this decl might be modified, save its type. This is
2964 done here rather than when the decl is first bound
2965 because the type may change after first binding, through
2966 being completed or through attributes being added. If we
2967 encounter multiple such decls, only the first should have
2968 its type saved; the others will already have had their
2969 proper types saved and the types will not have changed as
2970 their scopes will not have been re-entered. */
2971 if (DECL_P (b
->decl
) && DECL_FILE_SCOPE_P (b
->decl
) && !type_saved
)
2973 b
->u
.type
= TREE_TYPE (b
->decl
);
2976 if (B_IN_FILE_SCOPE (b
)
2978 && TREE_STATIC (b
->decl
)
2979 && TREE_CODE (TREE_TYPE (b
->decl
)) == ARRAY_TYPE
2980 && !TYPE_DOMAIN (TREE_TYPE (b
->decl
))
2981 && TREE_CODE (type
) == ARRAY_TYPE
2982 && TYPE_DOMAIN (type
)
2983 && TYPE_MAX_VALUE (TYPE_DOMAIN (type
))
2984 && !integer_zerop (TYPE_MAX_VALUE (TYPE_DOMAIN (type
))))
2986 /* Array type completed in inner scope, which should be
2987 diagnosed if the completion does not have size 1 and
2988 it does not get completed in the file scope. */
2989 b
->inner_comp
= true;
2994 /* If a matching external declaration has been found, set its
2995 type to the composite of all the types of that declaration.
2996 After the consistency checks, it will be reset to the
2997 composite of the visible types only. */
2998 if (b
&& (TREE_PUBLIC (x
) || same_translation_unit_p (x
, b
->decl
))
3000 TREE_TYPE (b
->decl
) = b
->u
.type
;
3002 /* The point of the same_translation_unit_p check here is,
3003 we want to detect a duplicate decl for a construct like
3004 foo() { extern bar(); } ... static bar(); but not if
3005 they are in different translation units. In any case,
3006 the static does not go in the externals scope. */
3008 && (TREE_PUBLIC (x
) || same_translation_unit_p (x
, b
->decl
))
3009 && duplicate_decls (x
, b
->decl
))
3014 if (comptypes (vistype
, type
))
3015 thistype
= composite_type (vistype
, type
);
3017 thistype
= TREE_TYPE (b
->decl
);
3021 b
->u
.type
= TREE_TYPE (b
->decl
);
3022 if (TREE_CODE (b
->decl
) == FUNCTION_DECL
&& DECL_BUILT_IN (b
->decl
))
3024 = build_type_attribute_variant (thistype
,
3025 TYPE_ATTRIBUTES (b
->u
.type
));
3026 TREE_TYPE (b
->decl
) = thistype
;
3027 bind (name
, b
->decl
, scope
, /*invisible=*/false, /*nested=*/true,
3031 else if (TREE_PUBLIC (x
))
3033 if (visdecl
&& !b
&& duplicate_decls (x
, visdecl
))
3035 /* An external declaration at block scope referring to a
3036 visible entity with internal linkage. The composite
3037 type will already be correct for this scope, so we
3038 just need to fall through to make the declaration in
3045 bind (name
, x
, external_scope
, /*invisible=*/true,
3046 /*nested=*/false, locus
);
3052 if (TREE_CODE (x
) != PARM_DECL
)
3053 warn_if_shadowing (x
);
3055 skip_external_and_shadow_checks
:
3056 if (TREE_CODE (x
) == TYPE_DECL
)
3058 /* So this is a typedef, set its underlying type. */
3059 set_underlying_type (x
);
3061 /* If X is a typedef defined in the current function, record it
3062 for the purpose of implementing the -Wunused-local-typedefs
3064 record_locally_defined_typedef (x
);
3067 bind (name
, x
, scope
, /*invisible=*/false, nested
, locus
);
3069 /* If x's type is incomplete because it's based on a
3070 structure or union which has not yet been fully declared,
3071 attach it to that structure or union type, so we can go
3072 back and complete the variable declaration later, if the
3073 structure or union gets fully declared.
3075 If the input is erroneous, we can have error_mark in the type
3076 slot (e.g. "f(void a, ...)") - that doesn't count as an
3078 if (TREE_TYPE (x
) != error_mark_node
3079 && !COMPLETE_TYPE_P (TREE_TYPE (x
)))
3081 tree element
= TREE_TYPE (x
);
3083 while (TREE_CODE (element
) == ARRAY_TYPE
)
3084 element
= TREE_TYPE (element
);
3085 element
= TYPE_MAIN_VARIANT (element
);
3087 if (RECORD_OR_UNION_TYPE_P (element
)
3088 && (TREE_CODE (x
) != TYPE_DECL
3089 || TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
)
3090 && !COMPLETE_TYPE_P (element
))
3091 C_TYPE_INCOMPLETE_VARS (element
)
3092 = tree_cons (NULL_TREE
, x
, C_TYPE_INCOMPLETE_VARS (element
));
3098 /* Issue a warning about implicit function declaration. ID is the function
3099 identifier, OLDDECL is a declaration of the function in a different scope,
3103 implicit_decl_warning (location_t loc
, tree id
, tree olddecl
)
3105 if (!warn_implicit_function_declaration
)
3109 const char *hint
= NULL
;
3111 hint
= lookup_name_fuzzy (id
, FUZZY_LOOKUP_FUNCTION_NAME
);
3117 gcc_rich_location
richloc (loc
);
3118 richloc
.add_fixit_replace (hint
);
3119 warned
= pedwarn_at_rich_loc
3120 (&richloc
, OPT_Wimplicit_function_declaration
,
3121 "implicit declaration of function %qE; did you mean %qs?",
3125 warned
= pedwarn (loc
, OPT_Wimplicit_function_declaration
,
3126 "implicit declaration of function %qE", id
);
3130 gcc_rich_location
richloc (loc
);
3131 richloc
.add_fixit_replace (hint
);
3132 warned
= warning_at_rich_loc
3133 (&richloc
, OPT_Wimplicit_function_declaration
,
3134 G_("implicit declaration of function %qE; did you mean %qs?"),
3138 warned
= warning_at (loc
, OPT_Wimplicit_function_declaration
,
3139 G_("implicit declaration of function %qE"), id
);
3141 if (olddecl
&& warned
)
3142 locate_old_decl (olddecl
);
3145 /* This function represents mapping of a function code FCODE
3146 to its respective header. */
3149 header_for_builtin_fn (enum built_in_function fcode
)
3153 CASE_FLT_FN (BUILT_IN_ACOS
):
3154 CASE_FLT_FN (BUILT_IN_ACOSH
):
3155 CASE_FLT_FN (BUILT_IN_ASIN
):
3156 CASE_FLT_FN (BUILT_IN_ASINH
):
3157 CASE_FLT_FN (BUILT_IN_ATAN
):
3158 CASE_FLT_FN (BUILT_IN_ATANH
):
3159 CASE_FLT_FN (BUILT_IN_ATAN2
):
3160 CASE_FLT_FN (BUILT_IN_CBRT
):
3161 CASE_FLT_FN (BUILT_IN_CEIL
):
3162 CASE_FLT_FN (BUILT_IN_COPYSIGN
):
3163 CASE_FLT_FN (BUILT_IN_COS
):
3164 CASE_FLT_FN (BUILT_IN_COSH
):
3165 CASE_FLT_FN (BUILT_IN_ERF
):
3166 CASE_FLT_FN (BUILT_IN_ERFC
):
3167 CASE_FLT_FN (BUILT_IN_EXP
):
3168 CASE_FLT_FN (BUILT_IN_EXP2
):
3169 CASE_FLT_FN (BUILT_IN_EXPM1
):
3170 CASE_FLT_FN (BUILT_IN_FABS
):
3171 CASE_FLT_FN (BUILT_IN_FDIM
):
3172 CASE_FLT_FN (BUILT_IN_FLOOR
):
3173 CASE_FLT_FN (BUILT_IN_FMA
):
3174 CASE_FLT_FN (BUILT_IN_FMAX
):
3175 CASE_FLT_FN (BUILT_IN_FMIN
):
3176 CASE_FLT_FN (BUILT_IN_FMOD
):
3177 CASE_FLT_FN (BUILT_IN_FREXP
):
3178 CASE_FLT_FN (BUILT_IN_HYPOT
):
3179 CASE_FLT_FN (BUILT_IN_ILOGB
):
3180 CASE_FLT_FN (BUILT_IN_LDEXP
):
3181 CASE_FLT_FN (BUILT_IN_LGAMMA
):
3182 CASE_FLT_FN (BUILT_IN_LLRINT
):
3183 CASE_FLT_FN (BUILT_IN_LLROUND
):
3184 CASE_FLT_FN (BUILT_IN_LOG
):
3185 CASE_FLT_FN (BUILT_IN_LOG10
):
3186 CASE_FLT_FN (BUILT_IN_LOG1P
):
3187 CASE_FLT_FN (BUILT_IN_LOG2
):
3188 CASE_FLT_FN (BUILT_IN_LOGB
):
3189 CASE_FLT_FN (BUILT_IN_LRINT
):
3190 CASE_FLT_FN (BUILT_IN_LROUND
):
3191 CASE_FLT_FN (BUILT_IN_MODF
):
3192 CASE_FLT_FN (BUILT_IN_NAN
):
3193 CASE_FLT_FN (BUILT_IN_NEARBYINT
):
3194 CASE_FLT_FN (BUILT_IN_NEXTAFTER
):
3195 CASE_FLT_FN (BUILT_IN_NEXTTOWARD
):
3196 CASE_FLT_FN (BUILT_IN_POW
):
3197 CASE_FLT_FN (BUILT_IN_REMAINDER
):
3198 CASE_FLT_FN (BUILT_IN_REMQUO
):
3199 CASE_FLT_FN (BUILT_IN_RINT
):
3200 CASE_FLT_FN (BUILT_IN_ROUND
):
3201 CASE_FLT_FN (BUILT_IN_SCALBLN
):
3202 CASE_FLT_FN (BUILT_IN_SCALBN
):
3203 CASE_FLT_FN (BUILT_IN_SIN
):
3204 CASE_FLT_FN (BUILT_IN_SINH
):
3205 CASE_FLT_FN (BUILT_IN_SINCOS
):
3206 CASE_FLT_FN (BUILT_IN_SQRT
):
3207 CASE_FLT_FN (BUILT_IN_TAN
):
3208 CASE_FLT_FN (BUILT_IN_TANH
):
3209 CASE_FLT_FN (BUILT_IN_TGAMMA
):
3210 CASE_FLT_FN (BUILT_IN_TRUNC
):
3211 case BUILT_IN_ISINF
:
3212 case BUILT_IN_ISNAN
:
3214 CASE_FLT_FN (BUILT_IN_CABS
):
3215 CASE_FLT_FN (BUILT_IN_CACOS
):
3216 CASE_FLT_FN (BUILT_IN_CACOSH
):
3217 CASE_FLT_FN (BUILT_IN_CARG
):
3218 CASE_FLT_FN (BUILT_IN_CASIN
):
3219 CASE_FLT_FN (BUILT_IN_CASINH
):
3220 CASE_FLT_FN (BUILT_IN_CATAN
):
3221 CASE_FLT_FN (BUILT_IN_CATANH
):
3222 CASE_FLT_FN (BUILT_IN_CCOS
):
3223 CASE_FLT_FN (BUILT_IN_CCOSH
):
3224 CASE_FLT_FN (BUILT_IN_CEXP
):
3225 CASE_FLT_FN (BUILT_IN_CIMAG
):
3226 CASE_FLT_FN (BUILT_IN_CLOG
):
3227 CASE_FLT_FN (BUILT_IN_CONJ
):
3228 CASE_FLT_FN (BUILT_IN_CPOW
):
3229 CASE_FLT_FN (BUILT_IN_CPROJ
):
3230 CASE_FLT_FN (BUILT_IN_CREAL
):
3231 CASE_FLT_FN (BUILT_IN_CSIN
):
3232 CASE_FLT_FN (BUILT_IN_CSINH
):
3233 CASE_FLT_FN (BUILT_IN_CSQRT
):
3234 CASE_FLT_FN (BUILT_IN_CTAN
):
3235 CASE_FLT_FN (BUILT_IN_CTANH
):
3236 return "<complex.h>";
3237 case BUILT_IN_MEMCHR
:
3238 case BUILT_IN_MEMCMP
:
3239 case BUILT_IN_MEMCPY
:
3240 case BUILT_IN_MEMMOVE
:
3241 case BUILT_IN_MEMSET
:
3242 case BUILT_IN_STRCAT
:
3243 case BUILT_IN_STRCHR
:
3244 case BUILT_IN_STRCMP
:
3245 case BUILT_IN_STRCPY
:
3246 case BUILT_IN_STRCSPN
:
3247 case BUILT_IN_STRLEN
:
3248 case BUILT_IN_STRNCAT
:
3249 case BUILT_IN_STRNCMP
:
3250 case BUILT_IN_STRNCPY
:
3251 case BUILT_IN_STRPBRK
:
3252 case BUILT_IN_STRRCHR
:
3253 case BUILT_IN_STRSPN
:
3254 case BUILT_IN_STRSTR
:
3255 return "<string.h>";
3256 case BUILT_IN_FPRINTF
:
3258 case BUILT_IN_FPUTC
:
3259 case BUILT_IN_FPUTS
:
3260 case BUILT_IN_FSCANF
:
3261 case BUILT_IN_FWRITE
:
3262 case BUILT_IN_PRINTF
:
3263 case BUILT_IN_PUTCHAR
:
3265 case BUILT_IN_SCANF
:
3266 case BUILT_IN_SNPRINTF
:
3267 case BUILT_IN_SPRINTF
:
3268 case BUILT_IN_SSCANF
:
3269 case BUILT_IN_VFPRINTF
:
3270 case BUILT_IN_VFSCANF
:
3271 case BUILT_IN_VPRINTF
:
3272 case BUILT_IN_VSCANF
:
3273 case BUILT_IN_VSNPRINTF
:
3274 case BUILT_IN_VSPRINTF
:
3275 case BUILT_IN_VSSCANF
:
3277 case BUILT_IN_ISALNUM
:
3278 case BUILT_IN_ISALPHA
:
3279 case BUILT_IN_ISBLANK
:
3280 case BUILT_IN_ISCNTRL
:
3281 case BUILT_IN_ISDIGIT
:
3282 case BUILT_IN_ISGRAPH
:
3283 case BUILT_IN_ISLOWER
:
3284 case BUILT_IN_ISPRINT
:
3285 case BUILT_IN_ISPUNCT
:
3286 case BUILT_IN_ISSPACE
:
3287 case BUILT_IN_ISUPPER
:
3288 case BUILT_IN_ISXDIGIT
:
3289 case BUILT_IN_TOLOWER
:
3290 case BUILT_IN_TOUPPER
:
3292 case BUILT_IN_ISWALNUM
:
3293 case BUILT_IN_ISWALPHA
:
3294 case BUILT_IN_ISWBLANK
:
3295 case BUILT_IN_ISWCNTRL
:
3296 case BUILT_IN_ISWDIGIT
:
3297 case BUILT_IN_ISWGRAPH
:
3298 case BUILT_IN_ISWLOWER
:
3299 case BUILT_IN_ISWPRINT
:
3300 case BUILT_IN_ISWPUNCT
:
3301 case BUILT_IN_ISWSPACE
:
3302 case BUILT_IN_ISWUPPER
:
3303 case BUILT_IN_ISWXDIGIT
:
3304 case BUILT_IN_TOWLOWER
:
3305 case BUILT_IN_TOWUPPER
:
3306 return "<wctype.h>";
3307 case BUILT_IN_ABORT
:
3309 case BUILT_IN_CALLOC
:
3313 case BUILT_IN_LLABS
:
3314 case BUILT_IN_MALLOC
:
3315 case BUILT_IN_REALLOC
:
3316 case BUILT_IN__EXIT2
:
3317 case BUILT_IN_ALIGNED_ALLOC
:
3318 return "<stdlib.h>";
3319 case BUILT_IN_IMAXABS
:
3320 return "<inttypes.h>";
3321 case BUILT_IN_STRFTIME
:
3328 /* Generate an implicit declaration for identifier FUNCTIONID at LOC as a
3329 function of type int (). */
3332 implicitly_declare (location_t loc
, tree functionid
)
3334 struct c_binding
*b
;
3335 tree decl
= NULL_TREE
;
3338 for (b
= I_SYMBOL_BINDING (functionid
); b
; b
= b
->shadowed
)
3340 if (B_IN_SCOPE (b
, external_scope
))
3349 if (TREE_CODE (decl
) != FUNCTION_DECL
)
3352 /* FIXME: Objective-C has weird not-really-builtin functions
3353 which are supposed to be visible automatically. They wind up
3354 in the external scope because they're pushed before the file
3355 scope gets created. Catch this here and rebind them into the
3357 if (!DECL_BUILT_IN (decl
) && DECL_IS_BUILTIN (decl
))
3359 bind (functionid
, decl
, file_scope
,
3360 /*invisible=*/false, /*nested=*/true,
3361 DECL_SOURCE_LOCATION (decl
));
3366 tree newtype
= default_function_type
;
3368 TREE_TYPE (decl
) = b
->u
.type
;
3369 /* Implicit declaration of a function already declared
3370 (somehow) in a different scope, or as a built-in.
3371 If this is the first time this has happened, warn;
3372 then recycle the old declaration but with the new type. */
3373 if (!C_DECL_IMPLICIT (decl
))
3375 implicit_decl_warning (loc
, functionid
, decl
);
3376 C_DECL_IMPLICIT (decl
) = 1;
3378 if (DECL_BUILT_IN (decl
))
3380 newtype
= build_type_attribute_variant (newtype
,
3382 (TREE_TYPE (decl
)));
3383 if (!comptypes (newtype
, TREE_TYPE (decl
)))
3385 bool warned
= warning_at (loc
, 0, "incompatible implicit "
3386 "declaration of built-in "
3387 "function %qD", decl
);
3388 /* See if we can hint which header to include. */
3390 = header_for_builtin_fn (DECL_FUNCTION_CODE (decl
));
3391 if (header
!= NULL
&& warned
)
3393 rich_location
richloc (line_table
, loc
);
3394 maybe_add_include_fixit (&richloc
, header
);
3397 "include %qs or provide a declaration of %qD",
3400 newtype
= TREE_TYPE (decl
);
3405 if (!comptypes (newtype
, TREE_TYPE (decl
)))
3407 error_at (loc
, "incompatible implicit declaration of "
3408 "function %qD", decl
);
3409 locate_old_decl (decl
);
3412 b
->u
.type
= TREE_TYPE (decl
);
3413 TREE_TYPE (decl
) = newtype
;
3414 bind (functionid
, decl
, current_scope
,
3415 /*invisible=*/false, /*nested=*/true,
3416 DECL_SOURCE_LOCATION (decl
));
3421 /* Not seen before. */
3422 decl
= build_decl (loc
, FUNCTION_DECL
, functionid
, default_function_type
);
3423 DECL_EXTERNAL (decl
) = 1;
3424 TREE_PUBLIC (decl
) = 1;
3425 C_DECL_IMPLICIT (decl
) = 1;
3426 implicit_decl_warning (loc
, functionid
, 0);
3427 asmspec_tree
= maybe_apply_renaming_pragma (decl
, /*asmname=*/NULL
);
3429 set_user_assembler_name (decl
, TREE_STRING_POINTER (asmspec_tree
));
3431 /* C89 says implicit declarations are in the innermost block.
3432 So we record the decl in the standard fashion. */
3433 decl
= pushdecl (decl
);
3435 /* No need to call objc_check_decl here - it's a function type. */
3436 rest_of_decl_compilation (decl
, 0, 0);
3438 /* Write a record describing this implicit function declaration
3439 to the prototypes file (if requested). */
3440 gen_aux_info_record (decl
, 0, 1, 0);
3442 /* Possibly apply some default attributes to this implicit declaration. */
3443 decl_attributes (&decl
, NULL_TREE
, 0);
3448 /* Issue an error message for a reference to an undeclared variable
3449 ID, including a reference to a builtin outside of function-call
3450 context. Establish a binding of the identifier to error_mark_node
3451 in an appropriate scope, which will suppress further errors for the
3452 same identifier. The error message should be given location LOC. */
3454 undeclared_variable (location_t loc
, tree id
)
3456 static bool already
= false;
3457 struct c_scope
*scope
;
3459 if (current_function_decl
== NULL_TREE
)
3461 const char *guessed_id
= lookup_name_fuzzy (id
, FUZZY_LOOKUP_NAME
);
3464 gcc_rich_location
richloc (loc
);
3465 richloc
.add_fixit_replace (guessed_id
);
3466 error_at_rich_loc (&richloc
,
3467 "%qE undeclared here (not in a function);"
3468 " did you mean %qs?",
3472 error_at (loc
, "%qE undeclared here (not in a function)", id
);
3473 scope
= current_scope
;
3477 if (!objc_diagnose_private_ivar (id
))
3479 const char *guessed_id
= lookup_name_fuzzy (id
, FUZZY_LOOKUP_NAME
);
3482 gcc_rich_location
richloc (loc
);
3483 richloc
.add_fixit_replace (guessed_id
);
3486 "%qE undeclared (first use in this function);"
3487 " did you mean %qs?",
3491 error_at (loc
, "%qE undeclared (first use in this function)", id
);
3495 inform (loc
, "each undeclared identifier is reported only"
3496 " once for each function it appears in");
3500 /* If we are parsing old-style parameter decls, current_function_decl
3501 will be nonnull but current_function_scope will be null. */
3502 scope
= current_function_scope
? current_function_scope
: current_scope
;
3504 bind (id
, error_mark_node
, scope
, /*invisible=*/false, /*nested=*/false,
3508 /* Subroutine of lookup_label, declare_label, define_label: construct a
3509 LABEL_DECL with all the proper frills. Also create a struct
3510 c_label_vars initialized for the current scope. */
3513 make_label (location_t location
, tree name
, bool defining
,
3514 struct c_label_vars
**p_label_vars
)
3516 tree label
= build_decl (location
, LABEL_DECL
, name
, void_type_node
);
3517 DECL_CONTEXT (label
) = current_function_decl
;
3518 SET_DECL_MODE (label
, VOIDmode
);
3520 c_label_vars
*label_vars
= ggc_alloc
<c_label_vars
> ();
3521 label_vars
->shadowed
= NULL
;
3522 set_spot_bindings (&label_vars
->label_bindings
, defining
);
3523 label_vars
->decls_in_scope
= make_tree_vector ();
3524 label_vars
->gotos
= NULL
;
3525 *p_label_vars
= label_vars
;
3530 /* Get the LABEL_DECL corresponding to identifier NAME as a label.
3531 Create one if none exists so far for the current function.
3532 This is called when a label is used in a goto expression or
3533 has its address taken. */
3536 lookup_label (tree name
)
3539 struct c_label_vars
*label_vars
;
3541 if (current_function_scope
== 0)
3543 error ("label %qE referenced outside of any function", name
);
3547 /* Use a label already defined or ref'd with this name, but not if
3548 it is inherited from a containing function and wasn't declared
3550 label
= I_LABEL_DECL (name
);
3551 if (label
&& (DECL_CONTEXT (label
) == current_function_decl
3552 || C_DECLARED_LABEL_FLAG (label
)))
3554 /* If the label has only been declared, update its apparent
3555 location to point here, for better diagnostics if it
3556 turns out not to have been defined. */
3557 if (DECL_INITIAL (label
) == NULL_TREE
)
3558 DECL_SOURCE_LOCATION (label
) = input_location
;
3562 /* No label binding for that identifier; make one. */
3563 label
= make_label (input_location
, name
, false, &label_vars
);
3565 /* Ordinary labels go in the current function scope. */
3566 bind_label (name
, label
, current_function_scope
, label_vars
);
3571 /* Issue a warning about DECL for a goto statement at GOTO_LOC going
3575 warn_about_goto (location_t goto_loc
, tree label
, tree decl
)
3577 if (variably_modified_type_p (TREE_TYPE (decl
), NULL_TREE
))
3579 "jump into scope of identifier with variably modified type");
3581 warning_at (goto_loc
, OPT_Wjump_misses_init
,
3582 "jump skips variable initialization");
3583 inform (DECL_SOURCE_LOCATION (label
), "label %qD defined here", label
);
3584 inform (DECL_SOURCE_LOCATION (decl
), "%qD declared here", decl
);
3587 /* Look up a label because of a goto statement. This is like
3588 lookup_label, but also issues any appropriate warnings. */
3591 lookup_label_for_goto (location_t loc
, tree name
)
3594 struct c_label_vars
*label_vars
;
3598 label
= lookup_label (name
);
3599 if (label
== NULL_TREE
)
3602 /* If we are jumping to a different function, we can't issue any
3604 if (DECL_CONTEXT (label
) != current_function_decl
)
3606 gcc_assert (C_DECLARED_LABEL_FLAG (label
));
3610 label_vars
= I_LABEL_BINDING (name
)->u
.label
;
3612 /* If the label has not yet been defined, then push this goto on a
3613 list for possible later warnings. */
3614 if (label_vars
->label_bindings
.scope
== NULL
)
3616 c_goto_bindings
*g
= ggc_alloc
<c_goto_bindings
> ();
3619 set_spot_bindings (&g
->goto_bindings
, true);
3620 vec_safe_push (label_vars
->gotos
, g
);
3624 /* If there are any decls in label_vars->decls_in_scope, then this
3625 goto has missed the declaration of the decl. This happens for a
3631 Issue a warning or error. */
3632 FOR_EACH_VEC_SAFE_ELT (label_vars
->decls_in_scope
, ix
, decl
)
3633 warn_about_goto (loc
, label
, decl
);
3635 if (label_vars
->label_bindings
.left_stmt_expr
)
3637 error_at (loc
, "jump into statement expression");
3638 inform (DECL_SOURCE_LOCATION (label
), "label %qD defined here", label
);
3644 /* Make a label named NAME in the current function, shadowing silently
3645 any that may be inherited from containing functions or containing
3646 scopes. This is called for __label__ declarations. */
3649 declare_label (tree name
)
3651 struct c_binding
*b
= I_LABEL_BINDING (name
);
3653 struct c_label_vars
*label_vars
;
3655 /* Check to make sure that the label hasn't already been declared
3657 if (b
&& B_IN_CURRENT_SCOPE (b
))
3659 error ("duplicate label declaration %qE", name
);
3660 locate_old_decl (b
->decl
);
3662 /* Just use the previous declaration. */
3666 label
= make_label (input_location
, name
, false, &label_vars
);
3667 C_DECLARED_LABEL_FLAG (label
) = 1;
3669 /* Declared labels go in the current scope. */
3670 bind_label (name
, label
, current_scope
, label_vars
);
3675 /* When we define a label, issue any appropriate warnings if there are
3676 any gotos earlier in the function which jump to this label. */
3679 check_earlier_gotos (tree label
, struct c_label_vars
* label_vars
)
3682 struct c_goto_bindings
*g
;
3684 FOR_EACH_VEC_SAFE_ELT (label_vars
->gotos
, ix
, g
)
3686 struct c_binding
*b
;
3687 struct c_scope
*scope
;
3689 /* We have a goto to this label. The goto is going forward. In
3690 g->scope, the goto is going to skip any binding which was
3691 defined after g->bindings_in_scope. */
3692 if (g
->goto_bindings
.scope
->has_jump_unsafe_decl
)
3694 for (b
= g
->goto_bindings
.scope
->bindings
;
3695 b
!= g
->goto_bindings
.bindings_in_scope
;
3698 if (decl_jump_unsafe (b
->decl
))
3699 warn_about_goto (g
->loc
, label
, b
->decl
);
3703 /* We also need to warn about decls defined in any scopes
3704 between the scope of the label and the scope of the goto. */
3705 for (scope
= label_vars
->label_bindings
.scope
;
3706 scope
!= g
->goto_bindings
.scope
;
3707 scope
= scope
->outer
)
3709 gcc_assert (scope
!= NULL
);
3710 if (scope
->has_jump_unsafe_decl
)
3712 if (scope
== label_vars
->label_bindings
.scope
)
3713 b
= label_vars
->label_bindings
.bindings_in_scope
;
3715 b
= scope
->bindings
;
3716 for (; b
!= NULL
; b
= b
->prev
)
3718 if (decl_jump_unsafe (b
->decl
))
3719 warn_about_goto (g
->loc
, label
, b
->decl
);
3724 if (g
->goto_bindings
.stmt_exprs
> 0)
3726 error_at (g
->loc
, "jump into statement expression");
3727 inform (DECL_SOURCE_LOCATION (label
), "label %qD defined here",
3732 /* Now that the label is defined, we will issue warnings about
3733 subsequent gotos to this label when we see them. */
3734 vec_safe_truncate (label_vars
->gotos
, 0);
3735 label_vars
->gotos
= NULL
;
3738 /* Define a label, specifying the location in the source file.
3739 Return the LABEL_DECL node for the label, if the definition is valid.
3740 Otherwise return NULL_TREE. */
3743 define_label (location_t location
, tree name
)
3745 /* Find any preexisting label with this name. It is an error
3746 if that label has already been defined in this function, or
3747 if there is a containing function with a declared label with
3749 tree label
= I_LABEL_DECL (name
);
3752 && ((DECL_CONTEXT (label
) == current_function_decl
3753 && DECL_INITIAL (label
) != NULL_TREE
)
3754 || (DECL_CONTEXT (label
) != current_function_decl
3755 && C_DECLARED_LABEL_FLAG (label
))))
3757 error_at (location
, "duplicate label %qD", label
);
3758 locate_old_decl (label
);
3761 else if (label
&& DECL_CONTEXT (label
) == current_function_decl
)
3763 struct c_label_vars
*label_vars
= I_LABEL_BINDING (name
)->u
.label
;
3765 /* The label has been used or declared already in this function,
3766 but not defined. Update its location to point to this
3768 DECL_SOURCE_LOCATION (label
) = location
;
3769 set_spot_bindings (&label_vars
->label_bindings
, true);
3771 /* Issue warnings as required about any goto statements from
3772 earlier in the function. */
3773 check_earlier_gotos (label
, label_vars
);
3777 struct c_label_vars
*label_vars
;
3779 /* No label binding for that identifier; make one. */
3780 label
= make_label (location
, name
, true, &label_vars
);
3782 /* Ordinary labels go in the current function scope. */
3783 bind_label (name
, label
, current_function_scope
, label_vars
);
3786 if (!in_system_header_at (input_location
) && lookup_name (name
))
3787 warning_at (location
, OPT_Wtraditional
,
3788 "traditional C lacks a separate namespace "
3789 "for labels, identifier %qE conflicts", name
);
3791 /* Mark label as having been defined. */
3792 DECL_INITIAL (label
) = error_mark_node
;
3796 /* Get the bindings for a new switch statement. This is used to issue
3797 warnings as appropriate for jumps from the switch to case or
3800 struct c_spot_bindings
*
3801 c_get_switch_bindings (void)
3803 struct c_spot_bindings
*switch_bindings
;
3805 switch_bindings
= XNEW (struct c_spot_bindings
);
3806 set_spot_bindings (switch_bindings
, true);
3807 return switch_bindings
;
3811 c_release_switch_bindings (struct c_spot_bindings
*bindings
)
3813 gcc_assert (bindings
->stmt_exprs
== 0 && !bindings
->left_stmt_expr
);
3817 /* This is called at the point of a case or default label to issue
3818 warnings about decls as needed. It returns true if it found an
3819 error, not just a warning. */
3822 c_check_switch_jump_warnings (struct c_spot_bindings
*switch_bindings
,
3823 location_t switch_loc
, location_t case_loc
)
3826 struct c_scope
*scope
;
3829 for (scope
= current_scope
;
3830 scope
!= switch_bindings
->scope
;
3831 scope
= scope
->outer
)
3833 struct c_binding
*b
;
3835 gcc_assert (scope
!= NULL
);
3837 if (!scope
->has_jump_unsafe_decl
)
3840 for (b
= scope
->bindings
; b
!= NULL
; b
= b
->prev
)
3842 if (decl_jump_unsafe (b
->decl
))
3844 if (variably_modified_type_p (TREE_TYPE (b
->decl
), NULL_TREE
))
3848 ("switch jumps into scope of identifier with "
3849 "variably modified type"));
3852 warning_at (case_loc
, OPT_Wjump_misses_init
,
3853 "switch jumps over variable initialization");
3854 inform (switch_loc
, "switch starts here");
3855 inform (DECL_SOURCE_LOCATION (b
->decl
), "%qD declared here",
3861 if (switch_bindings
->stmt_exprs
> 0)
3864 error_at (case_loc
, "switch jumps into statement expression");
3865 inform (switch_loc
, "switch starts here");
3871 /* Given NAME, an IDENTIFIER_NODE,
3872 return the structure (or union or enum) definition for that name.
3873 If THISLEVEL_ONLY is nonzero, searches only the current_scope.
3874 CODE says which kind of type the caller wants;
3875 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
3876 If PLOC is not NULL and this returns non-null, it sets *PLOC to the
3877 location where the tag was defined.
3878 If the wrong kind of type is found, an error is reported. */
3881 lookup_tag (enum tree_code code
, tree name
, bool thislevel_only
,
3884 struct c_binding
*b
= I_TAG_BINDING (name
);
3885 bool thislevel
= false;
3890 /* We only care about whether it's in this level if
3891 thislevel_only was set or it might be a type clash. */
3892 if (thislevel_only
|| TREE_CODE (b
->decl
) != code
)
3894 /* For our purposes, a tag in the external scope is the same as
3895 a tag in the file scope. (Primarily relevant to Objective-C
3896 and its builtin structure tags, which get pushed before the
3897 file scope is created.) */
3898 if (B_IN_CURRENT_SCOPE (b
)
3899 || (current_scope
== file_scope
&& B_IN_EXTERNAL_SCOPE (b
)))
3903 if (thislevel_only
&& !thislevel
)
3906 if (TREE_CODE (b
->decl
) != code
)
3908 /* Definition isn't the kind we were looking for. */
3909 pending_invalid_xref
= name
;
3910 pending_invalid_xref_location
= input_location
;
3912 /* If in the same binding level as a declaration as a tag
3913 of a different type, this must not be allowed to
3914 shadow that tag, so give the error immediately.
3915 (For example, "struct foo; union foo;" is invalid.) */
3917 pending_xref_error ();
3926 /* Return true if a definition exists for NAME with code CODE. */
3929 tag_exists_p (enum tree_code code
, tree name
)
3931 struct c_binding
*b
= I_TAG_BINDING (name
);
3933 if (b
== NULL
|| b
->decl
== NULL_TREE
)
3935 return TREE_CODE (b
->decl
) == code
;
3938 /* Print an error message now
3939 for a recent invalid struct, union or enum cross reference.
3940 We don't print them immediately because they are not invalid
3941 when used in the `struct foo;' construct for shadowing. */
3944 pending_xref_error (void)
3946 if (pending_invalid_xref
!= NULL_TREE
)
3947 error_at (pending_invalid_xref_location
, "%qE defined as wrong kind of tag",
3948 pending_invalid_xref
);
3949 pending_invalid_xref
= NULL_TREE
;
3953 /* Look up NAME in the current scope and its superiors
3954 in the namespace of variables, functions and typedefs.
3955 Return a ..._DECL node of some kind representing its definition,
3956 or return NULL_TREE if it is undefined. */
3959 lookup_name (tree name
)
3961 struct c_binding
*b
= I_SYMBOL_BINDING (name
);
3962 if (b
&& !b
->invisible
)
3964 maybe_record_typedef_use (b
->decl
);
3970 /* Similar to `lookup_name' but look only at the indicated scope. */
3973 lookup_name_in_scope (tree name
, struct c_scope
*scope
)
3975 struct c_binding
*b
;
3977 for (b
= I_SYMBOL_BINDING (name
); b
; b
= b
->shadowed
)
3978 if (B_IN_SCOPE (b
, scope
))
3983 /* Look for the closest match for NAME within the currently valid
3986 This finds the identifier with the lowest Levenshtein distance to
3987 NAME. If there are multiple candidates with equal minimal distance,
3988 the first one found is returned. Scopes are searched from innermost
3989 outwards, and within a scope in reverse order of declaration, thus
3990 benefiting candidates "near" to the current scope.
3992 The function also looks for similar macro names to NAME, since a
3993 misspelled macro name will not be expanded, and hence looks like an
3994 identifier to the C frontend.
3996 It also looks for start_typename keywords, to detect "singed" vs "signed"
4000 lookup_name_fuzzy (tree name
, enum lookup_name_fuzzy_kind kind
)
4002 gcc_assert (TREE_CODE (name
) == IDENTIFIER_NODE
);
4004 best_match
<tree
, tree
> bm (name
);
4006 /* Look within currently valid scopes. */
4007 for (c_scope
*scope
= current_scope
; scope
; scope
= scope
->outer
)
4008 for (c_binding
*binding
= scope
->bindings
; binding
; binding
= binding
->prev
)
4010 if (!binding
->id
|| binding
->invisible
)
4012 /* Don't use bindings from implicitly declared functions,
4013 as they were likely misspellings themselves. */
4014 if (TREE_CODE (binding
->decl
) == FUNCTION_DECL
)
4015 if (C_DECL_IMPLICIT (binding
->decl
))
4019 case FUZZY_LOOKUP_TYPENAME
:
4020 if (TREE_CODE (binding
->decl
) != TYPE_DECL
)
4024 case FUZZY_LOOKUP_FUNCTION_NAME
:
4025 if (TREE_CODE (binding
->decl
) != FUNCTION_DECL
)
4027 /* Allow function pointers. */
4028 if ((VAR_P (binding
->decl
)
4029 || TREE_CODE (binding
->decl
) == PARM_DECL
)
4030 && TREE_CODE (TREE_TYPE (binding
->decl
)) == POINTER_TYPE
4031 && (TREE_CODE (TREE_TYPE (TREE_TYPE (binding
->decl
)))
4041 bm
.consider (binding
->id
);
4044 /* Consider macros: if the user misspelled a macro name e.g. "SOME_MACRO"
4046 x = SOME_OTHER_MACRO (y);
4047 then "SOME_OTHER_MACRO" will survive to the frontend and show up
4048 as a misspelled identifier.
4050 Use the best distance so far so that a candidate is only set if
4051 a macro is better than anything so far. This allows early rejection
4052 (without calculating the edit distance) of macro names that must have
4053 distance >= bm.get_best_distance (), and means that we only get a
4054 non-NULL result for best_macro_match if it's better than any of
4055 the identifiers already checked, which avoids needless creation
4056 of identifiers for macro hashnodes. */
4057 best_macro_match
bmm (name
, bm
.get_best_distance (), parse_in
);
4058 cpp_hashnode
*best_macro
= bmm
.get_best_meaningful_candidate ();
4059 /* If a macro is the closest so far to NAME, use it, creating an
4060 identifier tree node for it. */
4063 const char *id
= (const char *)best_macro
->ident
.str
;
4064 tree macro_as_identifier
4065 = get_identifier_with_length (id
, best_macro
->ident
.len
);
4066 bm
.set_best_so_far (macro_as_identifier
,
4067 bmm
.get_best_distance (),
4068 bmm
.get_best_candidate_length ());
4071 /* Try the "start_typename" keywords to detect
4072 "singed" vs "signed" typos. */
4073 if (kind
== FUZZY_LOOKUP_TYPENAME
)
4075 for (unsigned i
= 0; i
< num_c_common_reswords
; i
++)
4077 const c_common_resword
*resword
= &c_common_reswords
[i
];
4078 if (!c_keyword_starts_typename (resword
->rid
))
4080 tree resword_identifier
= ridpointers
[resword
->rid
];
4081 if (!resword_identifier
)
4083 gcc_assert (TREE_CODE (resword_identifier
) == IDENTIFIER_NODE
);
4084 bm
.consider (resword_identifier
);
4088 tree best
= bm
.get_best_meaningful_candidate ();
4090 return IDENTIFIER_POINTER (best
);
4096 /* Create the predefined scalar types of C,
4097 and some nodes representing standard constants (0, 1, (void *) 0).
4098 Initialize the global scope.
4099 Make definitions for built-in primitive functions. */
4102 c_init_decl_processing (void)
4104 location_t save_loc
= input_location
;
4106 /* Initialize reserved words for parser. */
4109 current_function_decl
= NULL_TREE
;
4111 gcc_obstack_init (&parser_obstack
);
4113 /* Make the externals scope. */
4115 external_scope
= current_scope
;
4117 /* Declarations from c_common_nodes_and_builtins must not be associated
4118 with this input file, lest we get differences between using and not
4119 using preprocessed headers. */
4120 input_location
= BUILTINS_LOCATION
;
4122 c_common_nodes_and_builtins ();
4124 /* In C, comparisons and TRUTH_* expressions have type int. */
4125 truthvalue_type_node
= integer_type_node
;
4126 truthvalue_true_node
= integer_one_node
;
4127 truthvalue_false_node
= integer_zero_node
;
4129 /* Even in C99, which has a real boolean type. */
4130 pushdecl (build_decl (UNKNOWN_LOCATION
, TYPE_DECL
, get_identifier ("_Bool"),
4131 boolean_type_node
));
4133 input_location
= save_loc
;
4135 make_fname_decl
= c_make_fname_decl
;
4136 start_fname_decls ();
4139 /* Create the VAR_DECL at LOC for __FUNCTION__ etc. ID is the name to
4140 give the decl, NAME is the initialization string and TYPE_DEP
4141 indicates whether NAME depended on the type of the function. As we
4142 don't yet implement delayed emission of static data, we mark the
4143 decl as emitted so it is not placed in the output. Anything using
4144 it must therefore pull out the STRING_CST initializer directly.
4148 c_make_fname_decl (location_t loc
, tree id
, int type_dep
)
4150 const char *name
= fname_as_string (type_dep
);
4151 tree decl
, type
, init
;
4152 size_t length
= strlen (name
);
4154 type
= build_array_type (char_type_node
,
4155 build_index_type (size_int (length
)));
4156 type
= c_build_qualified_type (type
, TYPE_QUAL_CONST
);
4158 decl
= build_decl (loc
, VAR_DECL
, id
, type
);
4160 TREE_STATIC (decl
) = 1;
4161 TREE_READONLY (decl
) = 1;
4162 DECL_ARTIFICIAL (decl
) = 1;
4164 init
= build_string (length
+ 1, name
);
4165 free (CONST_CAST (char *, name
));
4166 TREE_TYPE (init
) = type
;
4167 DECL_INITIAL (decl
) = init
;
4169 TREE_USED (decl
) = 1;
4171 if (current_function_decl
4172 /* For invalid programs like this:
4175 const char* p = __FUNCTION__;
4177 the __FUNCTION__ is believed to appear in K&R style function
4178 parameter declarator. In that case we still don't have
4180 && current_function_scope
)
4182 DECL_CONTEXT (decl
) = current_function_decl
;
4183 bind (id
, decl
, current_function_scope
,
4184 /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION
);
4187 finish_decl (decl
, loc
, init
, NULL_TREE
, NULL_TREE
);
4193 c_builtin_function (tree decl
)
4195 tree type
= TREE_TYPE (decl
);
4196 tree id
= DECL_NAME (decl
);
4198 const char *name
= IDENTIFIER_POINTER (id
);
4199 C_DECL_BUILTIN_PROTOTYPE (decl
) = prototype_p (type
);
4201 /* Should never be called on a symbol with a preexisting meaning. */
4202 gcc_assert (!I_SYMBOL_BINDING (id
));
4204 bind (id
, decl
, external_scope
, /*invisible=*/true, /*nested=*/false,
4207 /* Builtins in the implementation namespace are made visible without
4208 needing to be explicitly declared. See push_file_scope. */
4209 if (name
[0] == '_' && (name
[1] == '_' || ISUPPER (name
[1])))
4211 DECL_CHAIN (decl
) = visible_builtins
;
4212 visible_builtins
= decl
;
4219 c_builtin_function_ext_scope (tree decl
)
4221 tree type
= TREE_TYPE (decl
);
4222 tree id
= DECL_NAME (decl
);
4224 const char *name
= IDENTIFIER_POINTER (id
);
4225 C_DECL_BUILTIN_PROTOTYPE (decl
) = prototype_p (type
);
4228 bind (id
, decl
, external_scope
, /*invisible=*/false, /*nested=*/false,
4231 /* Builtins in the implementation namespace are made visible without
4232 needing to be explicitly declared. See push_file_scope. */
4233 if (name
[0] == '_' && (name
[1] == '_' || ISUPPER (name
[1])))
4235 DECL_CHAIN (decl
) = visible_builtins
;
4236 visible_builtins
= decl
;
4242 /* Called when a declaration is seen that contains no names to declare.
4243 If its type is a reference to a structure, union or enum inherited
4244 from a containing scope, shadow that tag name for the current scope
4245 with a forward reference.
4246 If its type defines a new named structure or union
4247 or defines an enum, it is valid but we need not do anything here.
4248 Otherwise, it is an error. */
4251 shadow_tag (const struct c_declspecs
*declspecs
)
4253 shadow_tag_warned (declspecs
, 0);
4256 /* WARNED is 1 if we have done a pedwarn, 2 if we have done a warning,
4259 shadow_tag_warned (const struct c_declspecs
*declspecs
, int warned
)
4261 bool found_tag
= false;
4263 if (declspecs
->type
&& !declspecs
->default_int_p
&& !declspecs
->typedef_p
)
4265 tree value
= declspecs
->type
;
4266 enum tree_code code
= TREE_CODE (value
);
4268 if (code
== RECORD_TYPE
|| code
== UNION_TYPE
|| code
== ENUMERAL_TYPE
)
4269 /* Used to test also that TYPE_SIZE (value) != 0.
4270 That caused warning for `struct foo;' at top level in the file. */
4272 tree name
= TYPE_NAME (value
);
4277 if (declspecs
->restrict_p
)
4279 error ("invalid use of %<restrict%>");
4283 if (name
== NULL_TREE
)
4285 if (warned
!= 1 && code
!= ENUMERAL_TYPE
)
4286 /* Empty unnamed enum OK */
4288 pedwarn (input_location
, 0,
4289 "unnamed struct/union that defines no instances");
4293 else if (declspecs
->typespec_kind
!= ctsk_tagdef
4294 && declspecs
->typespec_kind
!= ctsk_tagfirstref
4295 && declspecs
->storage_class
!= csc_none
)
4298 pedwarn (input_location
, 0,
4299 "empty declaration with storage class specifier "
4300 "does not redeclare tag");
4302 pending_xref_error ();
4304 else if (declspecs
->typespec_kind
!= ctsk_tagdef
4305 && declspecs
->typespec_kind
!= ctsk_tagfirstref
4306 && (declspecs
->const_p
4307 || declspecs
->volatile_p
4308 || declspecs
->atomic_p
4309 || declspecs
->restrict_p
4310 || declspecs
->address_space
))
4313 pedwarn (input_location
, 0,
4314 "empty declaration with type qualifier "
4315 "does not redeclare tag");
4317 pending_xref_error ();
4319 else if (declspecs
->typespec_kind
!= ctsk_tagdef
4320 && declspecs
->typespec_kind
!= ctsk_tagfirstref
4321 && declspecs
->alignas_p
)
4324 pedwarn (input_location
, 0,
4325 "empty declaration with %<_Alignas%> "
4326 "does not redeclare tag");
4328 pending_xref_error ();
4332 pending_invalid_xref
= NULL_TREE
;
4333 t
= lookup_tag (code
, name
, true, NULL
);
4337 t
= make_node (code
);
4338 pushtag (input_location
, name
, t
);
4344 if (warned
!= 1 && !in_system_header_at (input_location
))
4346 pedwarn (input_location
, 0,
4347 "useless type name in empty declaration");
4352 else if (warned
!= 1 && !in_system_header_at (input_location
)
4353 && declspecs
->typedef_p
)
4355 pedwarn (input_location
, 0, "useless type name in empty declaration");
4359 pending_invalid_xref
= NULL_TREE
;
4361 if (declspecs
->inline_p
)
4363 error ("%<inline%> in empty declaration");
4367 if (declspecs
->noreturn_p
)
4369 error ("%<_Noreturn%> in empty declaration");
4373 if (current_scope
== file_scope
&& declspecs
->storage_class
== csc_auto
)
4375 error ("%<auto%> in file-scope empty declaration");
4379 if (current_scope
== file_scope
&& declspecs
->storage_class
== csc_register
)
4381 error ("%<register%> in file-scope empty declaration");
4385 if (!warned
&& !in_system_header_at (input_location
)
4386 && declspecs
->storage_class
!= csc_none
)
4388 warning (0, "useless storage class specifier in empty declaration");
4392 if (!warned
&& !in_system_header_at (input_location
) && declspecs
->thread_p
)
4394 warning (0, "useless %qs in empty declaration",
4395 declspecs
->thread_gnu_p
? "__thread" : "_Thread_local");
4400 && !in_system_header_at (input_location
)
4401 && (declspecs
->const_p
4402 || declspecs
->volatile_p
4403 || declspecs
->atomic_p
4404 || declspecs
->restrict_p
4405 || declspecs
->address_space
))
4407 warning (0, "useless type qualifier in empty declaration");
4411 if (!warned
&& !in_system_header_at (input_location
)
4412 && declspecs
->alignas_p
)
4414 warning (0, "useless %<_Alignas%> in empty declaration");
4421 pedwarn (input_location
, 0, "empty declaration");
4426 /* Return the qualifiers from SPECS as a bitwise OR of TYPE_QUAL_*
4427 bits. SPECS represents declaration specifiers that the grammar
4428 only permits to contain type qualifiers and attributes. */
4431 quals_from_declspecs (const struct c_declspecs
*specs
)
4433 int quals
= ((specs
->const_p
? TYPE_QUAL_CONST
: 0)
4434 | (specs
->volatile_p
? TYPE_QUAL_VOLATILE
: 0)
4435 | (specs
->restrict_p
? TYPE_QUAL_RESTRICT
: 0)
4436 | (specs
->atomic_p
? TYPE_QUAL_ATOMIC
: 0)
4437 | (ENCODE_QUAL_ADDR_SPACE (specs
->address_space
)));
4438 gcc_assert (!specs
->type
4439 && !specs
->decl_attr
4440 && specs
->typespec_word
== cts_none
4441 && specs
->storage_class
== csc_none
4442 && !specs
->typedef_p
4443 && !specs
->explicit_signed_p
4444 && !specs
->deprecated_p
4446 && !specs
->long_long_p
4449 && !specs
->unsigned_p
4450 && !specs
->complex_p
4452 && !specs
->noreturn_p
4453 && !specs
->thread_p
);
4457 /* Construct an array declarator. LOC is the location of the
4458 beginning of the array (usually the opening brace). EXPR is the
4459 expression inside [], or NULL_TREE. QUALS are the type qualifiers
4460 inside the [] (to be applied to the pointer to which a parameter
4461 array is converted). STATIC_P is true if "static" is inside the
4462 [], false otherwise. VLA_UNSPEC_P is true if the array is [*], a
4463 VLA of unspecified length which is nevertheless a complete type,
4464 false otherwise. The field for the contained declarator is left to
4465 be filled in by set_array_declarator_inner. */
4467 struct c_declarator
*
4468 build_array_declarator (location_t loc
,
4469 tree expr
, struct c_declspecs
*quals
, bool static_p
,
4472 struct c_declarator
*declarator
= XOBNEW (&parser_obstack
,
4473 struct c_declarator
);
4474 declarator
->id_loc
= loc
;
4475 declarator
->kind
= cdk_array
;
4476 declarator
->declarator
= 0;
4477 declarator
->u
.array
.dimen
= expr
;
4480 declarator
->u
.array
.attrs
= quals
->attrs
;
4481 declarator
->u
.array
.quals
= quals_from_declspecs (quals
);
4485 declarator
->u
.array
.attrs
= NULL_TREE
;
4486 declarator
->u
.array
.quals
= 0;
4488 declarator
->u
.array
.static_p
= static_p
;
4489 declarator
->u
.array
.vla_unspec_p
= vla_unspec_p
;
4490 if (static_p
|| quals
!= NULL
)
4491 pedwarn_c90 (loc
, OPT_Wpedantic
,
4492 "ISO C90 does not support %<static%> or type "
4493 "qualifiers in parameter array declarators");
4495 pedwarn_c90 (loc
, OPT_Wpedantic
,
4496 "ISO C90 does not support %<[*]%> array declarators");
4499 if (!current_scope
->parm_flag
)
4502 error_at (loc
, "%<[*]%> not allowed in other than "
4503 "function prototype scope");
4504 declarator
->u
.array
.vla_unspec_p
= false;
4507 current_scope
->had_vla_unspec
= true;
4512 /* Set the contained declarator of an array declarator. DECL is the
4513 declarator, as constructed by build_array_declarator; INNER is what
4514 appears on the left of the []. */
4516 struct c_declarator
*
4517 set_array_declarator_inner (struct c_declarator
*decl
,
4518 struct c_declarator
*inner
)
4520 decl
->declarator
= inner
;
4524 /* INIT is a constructor that forms DECL's initializer. If the final
4525 element initializes a flexible array field, add the size of that
4526 initializer to DECL's size. */
4529 add_flexible_array_elts_to_size (tree decl
, tree init
)
4533 if (vec_safe_is_empty (CONSTRUCTOR_ELTS (init
)))
4536 elt
= CONSTRUCTOR_ELTS (init
)->last ().value
;
4537 type
= TREE_TYPE (elt
);
4538 if (TREE_CODE (type
) == ARRAY_TYPE
4539 && TYPE_SIZE (type
) == NULL_TREE
4540 && TYPE_DOMAIN (type
) != NULL_TREE
4541 && TYPE_MAX_VALUE (TYPE_DOMAIN (type
)) == NULL_TREE
)
4543 complete_array_type (&type
, elt
, false);
4545 = size_binop (PLUS_EXPR
, DECL_SIZE (decl
), TYPE_SIZE (type
));
4546 DECL_SIZE_UNIT (decl
)
4547 = size_binop (PLUS_EXPR
, DECL_SIZE_UNIT (decl
), TYPE_SIZE_UNIT (type
));
4551 /* Decode a "typename", such as "int **", returning a ..._TYPE node.
4552 Set *EXPR, if EXPR not NULL, to any expression to be evaluated
4553 before the type name, and set *EXPR_CONST_OPERANDS, if
4554 EXPR_CONST_OPERANDS not NULL, to indicate whether the type name may
4555 appear in a constant expression. */
4558 groktypename (struct c_type_name
*type_name
, tree
*expr
,
4559 bool *expr_const_operands
)
4562 tree attrs
= type_name
->specs
->attrs
;
4564 type_name
->specs
->attrs
= NULL_TREE
;
4566 type
= grokdeclarator (type_name
->declarator
, type_name
->specs
, TYPENAME
,
4567 false, NULL
, &attrs
, expr
, expr_const_operands
,
4570 /* Apply attributes. */
4571 decl_attributes (&type
, attrs
, 0);
4576 /* Wrapper for decl_attributes that adds some implicit attributes
4577 to VAR_DECLs or FUNCTION_DECLs. */
4580 c_decl_attributes (tree
*node
, tree attributes
, int flags
)
4582 /* Add implicit "omp declare target" attribute if requested. */
4583 if (current_omp_declare_target_attribute
4584 && ((VAR_P (*node
) && is_global_var (*node
))
4585 || TREE_CODE (*node
) == FUNCTION_DECL
))
4588 && !lang_hooks
.types
.omp_mappable_type (TREE_TYPE (*node
)))
4589 error ("%q+D in declare target directive does not have mappable type",
4592 attributes
= tree_cons (get_identifier ("omp declare target"),
4593 NULL_TREE
, attributes
);
4595 return decl_attributes (node
, attributes
, flags
);
4599 /* Decode a declarator in an ordinary declaration or data definition.
4600 This is called as soon as the type information and variable name
4601 have been parsed, before parsing the initializer if any.
4602 Here we create the ..._DECL node, fill in its type,
4603 and put it on the list of decls for the current context.
4604 The ..._DECL node is returned as the value.
4606 Exception: for arrays where the length is not specified,
4607 the type is left null, to be filled in by `finish_decl'.
4609 Function definitions do not come here; they go to start_function
4610 instead. However, external and forward declarations of functions
4611 do go through here. Structure field declarations are done by
4612 grokfield and not through here. */
4615 start_decl (struct c_declarator
*declarator
, struct c_declspecs
*declspecs
,
4616 bool initialized
, tree attributes
)
4620 tree expr
= NULL_TREE
;
4621 enum deprecated_states deprecated_state
= DEPRECATED_NORMAL
;
4623 /* An object declared as __attribute__((deprecated)) suppresses
4624 warnings of uses of other deprecated items. */
4625 if (lookup_attribute ("deprecated", attributes
))
4626 deprecated_state
= DEPRECATED_SUPPRESS
;
4628 decl
= grokdeclarator (declarator
, declspecs
,
4629 NORMAL
, initialized
, NULL
, &attributes
, &expr
, NULL
,
4631 if (!decl
|| decl
== error_mark_node
)
4635 add_stmt (fold_convert (void_type_node
, expr
));
4637 if (TREE_CODE (decl
) != FUNCTION_DECL
&& MAIN_NAME_P (DECL_NAME (decl
)))
4638 warning (OPT_Wmain
, "%q+D is usually a function", decl
);
4641 /* Is it valid for this decl to have an initializer at all?
4642 If not, set INITIALIZED to zero, which will indirectly
4643 tell 'finish_decl' to ignore the initializer once it is parsed. */
4644 switch (TREE_CODE (decl
))
4647 error ("typedef %qD is initialized (use __typeof__ instead)", decl
);
4648 initialized
= false;
4652 error ("function %qD is initialized like a variable", decl
);
4653 initialized
= false;
4657 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
4658 error ("parameter %qD is initialized", decl
);
4659 initialized
= false;
4663 /* Don't allow initializations for incomplete types except for
4664 arrays which might be completed by the initialization. */
4666 /* This can happen if the array size is an undefined macro.
4667 We already gave a warning, so we don't need another one. */
4668 if (TREE_TYPE (decl
) == error_mark_node
)
4669 initialized
= false;
4670 else if (COMPLETE_TYPE_P (TREE_TYPE (decl
)))
4672 /* A complete type is ok if size is fixed. */
4674 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl
))) != INTEGER_CST
4675 || C_DECL_VARIABLE_SIZE (decl
))
4677 error ("variable-sized object may not be initialized");
4678 initialized
= false;
4681 else if (TREE_CODE (TREE_TYPE (decl
)) != ARRAY_TYPE
)
4683 error ("variable %qD has initializer but incomplete type", decl
);
4684 initialized
= false;
4686 else if (C_DECL_VARIABLE_SIZE (decl
))
4688 /* Although C99 is unclear about whether incomplete arrays
4689 of VLAs themselves count as VLAs, it does not make
4690 sense to permit them to be initialized given that
4691 ordinary VLAs may not be initialized. */
4692 error ("variable-sized object may not be initialized");
4693 initialized
= false;
4699 if (current_scope
== file_scope
)
4700 TREE_STATIC (decl
) = 1;
4702 /* Tell 'pushdecl' this is an initialized decl
4703 even though we don't yet have the initializer expression.
4704 Also tell 'finish_decl' it may store the real initializer. */
4705 DECL_INITIAL (decl
) = error_mark_node
;
4708 /* If this is a function declaration, write a record describing it to the
4709 prototypes file (if requested). */
4711 if (TREE_CODE (decl
) == FUNCTION_DECL
)
4712 gen_aux_info_record (decl
, 0, 0, prototype_p (TREE_TYPE (decl
)));
4714 /* ANSI specifies that a tentative definition which is not merged with
4715 a non-tentative definition behaves exactly like a definition with an
4716 initializer equal to zero. (Section 3.7.2)
4718 -fno-common gives strict ANSI behavior, though this tends to break
4719 a large body of code that grew up without this rule.
4721 Thread-local variables are never common, since there's no entrenched
4722 body of code to break, and it allows more efficient variable references
4723 in the presence of dynamic linking. */
4727 && TREE_PUBLIC (decl
)
4728 && !DECL_THREAD_LOCAL_P (decl
)
4730 DECL_COMMON (decl
) = 1;
4732 /* Set attributes here so if duplicate decl, will have proper attributes. */
4733 c_decl_attributes (&decl
, attributes
, 0);
4735 /* Handle gnu_inline attribute. */
4736 if (declspecs
->inline_p
4737 && !flag_gnu89_inline
4738 && TREE_CODE (decl
) == FUNCTION_DECL
4739 && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl
))
4740 || current_function_decl
))
4742 if (declspecs
->storage_class
== csc_auto
&& current_scope
!= file_scope
)
4744 else if (declspecs
->storage_class
!= csc_static
)
4745 DECL_EXTERNAL (decl
) = !DECL_EXTERNAL (decl
);
4748 if (TREE_CODE (decl
) == FUNCTION_DECL
4749 && targetm
.calls
.promote_prototypes (TREE_TYPE (decl
)))
4751 struct c_declarator
*ce
= declarator
;
4753 if (ce
->kind
== cdk_pointer
)
4754 ce
= declarator
->declarator
;
4755 if (ce
->kind
== cdk_function
)
4757 tree args
= ce
->u
.arg_info
->parms
;
4758 for (; args
; args
= DECL_CHAIN (args
))
4760 tree type
= TREE_TYPE (args
);
4761 if (type
&& INTEGRAL_TYPE_P (type
)
4762 && TYPE_PRECISION (type
) < TYPE_PRECISION (integer_type_node
))
4763 DECL_ARG_TYPE (args
) = c_type_promotes_to (type
);
4768 if (TREE_CODE (decl
) == FUNCTION_DECL
4769 && DECL_DECLARED_INLINE_P (decl
)
4770 && DECL_UNINLINABLE (decl
)
4771 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl
)))
4772 warning (OPT_Wattributes
, "inline function %q+D given attribute noinline",
4775 /* C99 6.7.4p3: An inline definition of a function with external
4776 linkage shall not contain a definition of a modifiable object
4777 with static storage duration... */
4779 && current_scope
!= file_scope
4780 && TREE_STATIC (decl
)
4781 && !TREE_READONLY (decl
)
4782 && DECL_DECLARED_INLINE_P (current_function_decl
)
4783 && DECL_EXTERNAL (current_function_decl
))
4784 record_inline_static (input_location
, current_function_decl
,
4785 decl
, csi_modifiable
);
4787 if (c_dialect_objc ()
4788 && VAR_OR_FUNCTION_DECL_P (decl
))
4789 objc_check_global_decl (decl
);
4791 /* Add this decl to the current scope.
4792 TEM may equal DECL or it may be a previous decl of the same name. */
4793 tem
= pushdecl (decl
);
4795 if (initialized
&& DECL_EXTERNAL (tem
))
4797 DECL_EXTERNAL (tem
) = 0;
4798 TREE_STATIC (tem
) = 1;
4804 /* Subroutine of finish_decl. TYPE is the type of an uninitialized object
4805 DECL or the non-array element type if DECL is an uninitialized array.
4806 If that type has a const member, diagnose this. */
4809 diagnose_uninitialized_cst_member (tree decl
, tree type
)
4812 for (field
= TYPE_FIELDS (type
); field
; field
= TREE_CHAIN (field
))
4815 if (TREE_CODE (field
) != FIELD_DECL
)
4817 field_type
= strip_array_types (TREE_TYPE (field
));
4819 if (TYPE_QUALS (field_type
) & TYPE_QUAL_CONST
)
4821 warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wc___compat
,
4822 "uninitialized const member in %qT is invalid in C++",
4823 strip_array_types (TREE_TYPE (decl
)));
4824 inform (DECL_SOURCE_LOCATION (field
), "%qD should be initialized", field
);
4827 if (RECORD_OR_UNION_TYPE_P (field_type
))
4828 diagnose_uninitialized_cst_member (decl
, field_type
);
4832 /* Finish processing of a declaration;
4833 install its initial value.
4834 If ORIGTYPE is not NULL_TREE, it is the original type of INIT.
4835 If the length of an array type is not known before,
4836 it must be determined now, from the initial value, or it is an error.
4838 INIT_LOC is the location of the initial value. */
4841 finish_decl (tree decl
, location_t init_loc
, tree init
,
4842 tree origtype
, tree asmspec_tree
)
4845 bool was_incomplete
= (DECL_SIZE (decl
) == NULL_TREE
);
4846 const char *asmspec
= 0;
4848 /* If a name was specified, get the string. */
4849 if (VAR_OR_FUNCTION_DECL_P (decl
)
4850 && DECL_FILE_SCOPE_P (decl
))
4851 asmspec_tree
= maybe_apply_renaming_pragma (decl
, asmspec_tree
);
4853 asmspec
= TREE_STRING_POINTER (asmspec_tree
);
4856 && TREE_STATIC (decl
)
4857 && global_bindings_p ())
4858 /* So decl is a global variable. Record the types it uses
4859 so that we can decide later to emit debug info for them. */
4860 record_types_used_by_current_var_decl (decl
);
4862 /* If `start_decl' didn't like having an initialization, ignore it now. */
4863 if (init
!= NULL_TREE
&& DECL_INITIAL (decl
) == NULL_TREE
)
4866 /* Don't crash if parm is initialized. */
4867 if (TREE_CODE (decl
) == PARM_DECL
)
4871 store_init_value (init_loc
, decl
, init
, origtype
);
4873 if (c_dialect_objc () && (VAR_OR_FUNCTION_DECL_P (decl
)
4874 || TREE_CODE (decl
) == FIELD_DECL
))
4875 objc_check_decl (decl
);
4877 type
= TREE_TYPE (decl
);
4879 /* Deduce size of array from initialization, if not already known. */
4880 if (TREE_CODE (type
) == ARRAY_TYPE
4881 && TYPE_DOMAIN (type
) == NULL_TREE
4882 && TREE_CODE (decl
) != TYPE_DECL
)
4885 = (TREE_STATIC (decl
)
4886 /* Even if pedantic, an external linkage array
4887 may have incomplete type at first. */
4888 ? pedantic
&& !TREE_PUBLIC (decl
)
4889 : !DECL_EXTERNAL (decl
));
4891 = complete_array_type (&TREE_TYPE (decl
), DECL_INITIAL (decl
),
4894 /* Get the completed type made by complete_array_type. */
4895 type
= TREE_TYPE (decl
);
4900 error ("initializer fails to determine size of %q+D", decl
);
4905 error ("array size missing in %q+D", decl
);
4906 /* If a `static' var's size isn't known,
4907 make it extern as well as static, so it does not get
4909 If it is not `static', then do not mark extern;
4910 finish_incomplete_decl will give it a default size
4911 and it will get allocated. */
4912 else if (!pedantic
&& TREE_STATIC (decl
) && !TREE_PUBLIC (decl
))
4913 DECL_EXTERNAL (decl
) = 1;
4917 error ("zero or negative size array %q+D", decl
);
4921 /* For global variables, update the copy of the type that
4922 exists in the binding. */
4923 if (TREE_PUBLIC (decl
))
4925 struct c_binding
*b_ext
= I_SYMBOL_BINDING (DECL_NAME (decl
));
4926 while (b_ext
&& !B_IN_EXTERNAL_SCOPE (b_ext
))
4927 b_ext
= b_ext
->shadowed
;
4928 if (b_ext
&& TREE_CODE (decl
) == TREE_CODE (b_ext
->decl
))
4930 if (b_ext
->u
.type
&& comptypes (b_ext
->u
.type
, type
))
4931 b_ext
->u
.type
= composite_type (b_ext
->u
.type
, type
);
4933 b_ext
->u
.type
= type
;
4942 if (DECL_INITIAL (decl
))
4943 TREE_TYPE (DECL_INITIAL (decl
)) = type
;
4945 relayout_decl (decl
);
4950 if (init
&& TREE_CODE (init
) == CONSTRUCTOR
)
4951 add_flexible_array_elts_to_size (decl
, init
);
4953 if (DECL_SIZE (decl
) == NULL_TREE
&& TREE_TYPE (decl
) != error_mark_node
4954 && COMPLETE_TYPE_P (TREE_TYPE (decl
)))
4955 layout_decl (decl
, 0);
4957 if (DECL_SIZE (decl
) == NULL_TREE
4958 /* Don't give an error if we already gave one earlier. */
4959 && TREE_TYPE (decl
) != error_mark_node
4960 && (TREE_STATIC (decl
)
4961 /* A static variable with an incomplete type
4962 is an error if it is initialized.
4963 Also if it is not file scope.
4964 Otherwise, let it through, but if it is not `extern'
4965 then it may cause an error message later. */
4966 ? (DECL_INITIAL (decl
) != NULL_TREE
4967 || !DECL_FILE_SCOPE_P (decl
))
4968 /* An automatic variable with an incomplete type
4970 : !DECL_EXTERNAL (decl
)))
4972 error ("storage size of %q+D isn%'t known", decl
);
4973 TREE_TYPE (decl
) = error_mark_node
;
4976 if ((RECORD_OR_UNION_TYPE_P (TREE_TYPE (decl
))
4977 || TREE_CODE (TREE_TYPE (decl
)) == ENUMERAL_TYPE
)
4978 && DECL_SIZE (decl
) == NULL_TREE
4979 && TREE_STATIC (decl
))
4980 incomplete_record_decls
.safe_push (decl
);
4982 if (is_global_var (decl
) && DECL_SIZE (decl
) != NULL_TREE
)
4984 if (TREE_CODE (DECL_SIZE (decl
)) == INTEGER_CST
)
4985 constant_expression_warning (DECL_SIZE (decl
));
4988 error ("storage size of %q+D isn%'t constant", decl
);
4989 TREE_TYPE (decl
) = error_mark_node
;
4993 if (TREE_USED (type
))
4995 TREE_USED (decl
) = 1;
4996 DECL_READ_P (decl
) = 1;
5000 /* If this is a function and an assembler name is specified, reset DECL_RTL
5001 so we can give it its new name. Also, update builtin_decl if it
5002 was a normal built-in. */
5003 if (TREE_CODE (decl
) == FUNCTION_DECL
&& asmspec
)
5005 if (DECL_BUILT_IN_CLASS (decl
) == BUILT_IN_NORMAL
)
5006 set_builtin_user_assembler_name (decl
, asmspec
);
5007 set_user_assembler_name (decl
, asmspec
);
5010 /* If #pragma weak was used, mark the decl weak now. */
5011 maybe_apply_pragma_weak (decl
);
5013 /* Output the assembler code and/or RTL code for variables and functions,
5014 unless the type is an undefined structure or union.
5015 If not, it will get done when the type is completed. */
5017 if (VAR_OR_FUNCTION_DECL_P (decl
))
5019 /* Determine the ELF visibility. */
5020 if (TREE_PUBLIC (decl
))
5021 c_determine_visibility (decl
);
5023 /* This is a no-op in c-lang.c or something real in objc-act.c. */
5024 if (c_dialect_objc ())
5025 objc_check_decl (decl
);
5029 /* If this is not a static variable, issue a warning.
5030 It doesn't make any sense to give an ASMSPEC for an
5031 ordinary, non-register local variable. Historically,
5032 GCC has accepted -- but ignored -- the ASMSPEC in
5034 if (!DECL_FILE_SCOPE_P (decl
)
5036 && !C_DECL_REGISTER (decl
)
5037 && !TREE_STATIC (decl
))
5038 warning (0, "ignoring asm-specifier for non-static local "
5039 "variable %q+D", decl
);
5041 set_user_assembler_name (decl
, asmspec
);
5044 if (DECL_FILE_SCOPE_P (decl
))
5046 if (DECL_INITIAL (decl
) == NULL_TREE
5047 || DECL_INITIAL (decl
) == error_mark_node
)
5048 /* Don't output anything
5049 when a tentative file-scope definition is seen.
5050 But at end of compilation, do output code for them. */
5051 DECL_DEFER_OUTPUT (decl
) = 1;
5052 if (asmspec
&& VAR_P (decl
) && C_DECL_REGISTER (decl
))
5053 DECL_HARD_REGISTER (decl
) = 1;
5054 rest_of_decl_compilation (decl
, true, 0);
5058 /* In conjunction with an ASMSPEC, the `register'
5059 keyword indicates that we should place the variable
5060 in a particular register. */
5061 if (asmspec
&& C_DECL_REGISTER (decl
))
5063 DECL_HARD_REGISTER (decl
) = 1;
5064 /* This cannot be done for a structure with volatile
5065 fields, on which DECL_REGISTER will have been
5067 if (!DECL_REGISTER (decl
))
5068 error ("cannot put object with volatile field into register");
5071 if (TREE_CODE (decl
) != FUNCTION_DECL
)
5073 /* If we're building a variable sized type, and we might be
5074 reachable other than via the top of the current binding
5075 level, then create a new BIND_EXPR so that we deallocate
5076 the object at the right time. */
5077 /* Note that DECL_SIZE can be null due to errors. */
5078 if (DECL_SIZE (decl
)
5079 && !TREE_CONSTANT (DECL_SIZE (decl
))
5080 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list
))
5083 bind
= build3 (BIND_EXPR
, void_type_node
, NULL
, NULL
, NULL
);
5084 TREE_SIDE_EFFECTS (bind
) = 1;
5086 BIND_EXPR_BODY (bind
) = push_stmt_list ();
5088 add_stmt (build_stmt (DECL_SOURCE_LOCATION (decl
),
5094 if (!DECL_FILE_SCOPE_P (decl
))
5096 /* Recompute the RTL of a local array now
5097 if it used to be an incomplete type. */
5098 if (was_incomplete
&& !is_global_var (decl
))
5100 /* If we used it already as memory, it must stay in memory. */
5101 TREE_ADDRESSABLE (decl
) = TREE_USED (decl
);
5102 /* If it's still incomplete now, no init will save it. */
5103 if (DECL_SIZE (decl
) == NULL_TREE
)
5104 DECL_INITIAL (decl
) = NULL_TREE
;
5109 if (TREE_CODE (decl
) == TYPE_DECL
)
5111 if (!DECL_FILE_SCOPE_P (decl
)
5112 && variably_modified_type_p (TREE_TYPE (decl
), NULL_TREE
))
5113 add_stmt (build_stmt (DECL_SOURCE_LOCATION (decl
), DECL_EXPR
, decl
));
5115 rest_of_decl_compilation (decl
, DECL_FILE_SCOPE_P (decl
), 0);
5118 /* Install a cleanup (aka destructor) if one was given. */
5119 if (VAR_P (decl
) && !TREE_STATIC (decl
))
5121 tree attr
= lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl
));
5124 tree cleanup_id
= TREE_VALUE (TREE_VALUE (attr
));
5125 tree cleanup_decl
= lookup_name (cleanup_id
);
5127 vec
<tree
, va_gc
> *v
;
5129 /* Build "cleanup(&decl)" for the destructor. */
5130 cleanup
= build_unary_op (input_location
, ADDR_EXPR
, decl
, false);
5132 v
->quick_push (cleanup
);
5133 cleanup
= c_build_function_call_vec (DECL_SOURCE_LOCATION (decl
),
5134 vNULL
, cleanup_decl
, v
, NULL
);
5137 /* Don't warn about decl unused; the cleanup uses it. */
5138 TREE_USED (decl
) = 1;
5139 TREE_USED (cleanup_decl
) = 1;
5140 DECL_READ_P (decl
) = 1;
5142 push_cleanup (decl
, cleanup
, false);
5148 && !DECL_EXTERNAL (decl
)
5149 && DECL_INITIAL (decl
) == NULL_TREE
)
5151 type
= strip_array_types (type
);
5152 if (TREE_READONLY (decl
))
5153 warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wc___compat
,
5154 "uninitialized const %qD is invalid in C++", decl
);
5155 else if (RECORD_OR_UNION_TYPE_P (type
)
5156 && C_TYPE_FIELDS_READONLY (type
))
5157 diagnose_uninitialized_cst_member (decl
, type
);
5160 invoke_plugin_callbacks (PLUGIN_FINISH_DECL
, decl
);
5163 /* Given a parsed parameter declaration, decode it into a PARM_DECL.
5164 EXPR is NULL or a pointer to an expression that needs to be
5165 evaluated for the side effects of array size expressions in the
5169 grokparm (const struct c_parm
*parm
, tree
*expr
)
5171 tree attrs
= parm
->attrs
;
5172 tree decl
= grokdeclarator (parm
->declarator
, parm
->specs
, PARM
, false,
5173 NULL
, &attrs
, expr
, NULL
, DEPRECATED_NORMAL
);
5175 decl_attributes (&decl
, attrs
, 0);
5180 /* Given a parsed parameter declaration, decode it into a PARM_DECL
5181 and push that on the current scope. EXPR is a pointer to an
5182 expression that needs to be evaluated for the side effects of array
5183 size expressions in the parameters. */
5186 push_parm_decl (const struct c_parm
*parm
, tree
*expr
)
5188 tree attrs
= parm
->attrs
;
5191 decl
= grokdeclarator (parm
->declarator
, parm
->specs
, PARM
, false, NULL
,
5192 &attrs
, expr
, NULL
, DEPRECATED_NORMAL
);
5193 decl_attributes (&decl
, attrs
, 0);
5195 decl
= pushdecl (decl
);
5197 finish_decl (decl
, input_location
, NULL_TREE
, NULL_TREE
, NULL_TREE
);
5200 /* Mark all the parameter declarations to date as forward decls.
5201 Also diagnose use of this extension. */
5204 mark_forward_parm_decls (void)
5206 struct c_binding
*b
;
5208 if (pedantic
&& !current_scope
->warned_forward_parm_decls
)
5210 pedwarn (input_location
, OPT_Wpedantic
,
5211 "ISO C forbids forward parameter declarations");
5212 current_scope
->warned_forward_parm_decls
= true;
5215 for (b
= current_scope
->bindings
; b
; b
= b
->prev
)
5216 if (TREE_CODE (b
->decl
) == PARM_DECL
)
5217 TREE_ASM_WRITTEN (b
->decl
) = 1;
5220 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
5221 literal, which may be an incomplete array type completed by the
5222 initializer; INIT is a CONSTRUCTOR at LOC that initializes the compound
5223 literal. NON_CONST is true if the initializers contain something
5224 that cannot occur in a constant expression. */
5227 build_compound_literal (location_t loc
, tree type
, tree init
, bool non_const
)
5229 /* We do not use start_decl here because we have a type, not a declarator;
5230 and do not use finish_decl because the decl should be stored inside
5231 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_EXPR. */
5236 if (type
== error_mark_node
5237 || init
== error_mark_node
)
5238 return error_mark_node
;
5240 decl
= build_decl (loc
, VAR_DECL
, NULL_TREE
, type
);
5241 DECL_EXTERNAL (decl
) = 0;
5242 TREE_PUBLIC (decl
) = 0;
5243 TREE_STATIC (decl
) = (current_scope
== file_scope
);
5244 DECL_CONTEXT (decl
) = current_function_decl
;
5245 TREE_USED (decl
) = 1;
5246 DECL_READ_P (decl
) = 1;
5247 DECL_ARTIFICIAL (decl
) = 1;
5248 DECL_IGNORED_P (decl
) = 1;
5249 TREE_TYPE (decl
) = type
;
5250 TREE_READONLY (decl
) = (TYPE_READONLY (type
)
5251 || (TREE_CODE (type
) == ARRAY_TYPE
5252 && TYPE_READONLY (TREE_TYPE (type
))));
5253 store_init_value (loc
, decl
, init
, NULL_TREE
);
5255 if (TREE_CODE (type
) == ARRAY_TYPE
&& !COMPLETE_TYPE_P (type
))
5257 int failure
= complete_array_type (&TREE_TYPE (decl
),
5258 DECL_INITIAL (decl
), true);
5259 /* If complete_array_type returns 3, it means that the
5260 initial value of the compound literal is empty. Allow it. */
5261 gcc_assert (failure
== 0 || failure
== 3);
5263 type
= TREE_TYPE (decl
);
5264 TREE_TYPE (DECL_INITIAL (decl
)) = type
;
5267 if (type
== error_mark_node
|| !COMPLETE_TYPE_P (type
))
5269 c_incomplete_type_error (loc
, NULL_TREE
, type
);
5270 return error_mark_node
;
5273 stmt
= build_stmt (DECL_SOURCE_LOCATION (decl
), DECL_EXPR
, decl
);
5274 complit
= build1 (COMPOUND_LITERAL_EXPR
, type
, stmt
);
5275 TREE_SIDE_EFFECTS (complit
) = 1;
5277 layout_decl (decl
, 0);
5279 if (TREE_STATIC (decl
))
5281 /* This decl needs a name for the assembler output. */
5282 set_compound_literal_name (decl
);
5283 DECL_DEFER_OUTPUT (decl
) = 1;
5284 DECL_COMDAT (decl
) = 1;
5286 rest_of_decl_compilation (decl
, 1, 0);
5291 complit
= build2 (C_MAYBE_CONST_EXPR
, type
, NULL
, complit
);
5292 C_MAYBE_CONST_EXPR_NON_CONST (complit
) = 1;
5298 /* Check the type of a compound literal. Here we just check that it
5299 is valid for C++. */
5302 check_compound_literal_type (location_t loc
, struct c_type_name
*type_name
)
5305 && (type_name
->specs
->typespec_kind
== ctsk_tagdef
5306 || type_name
->specs
->typespec_kind
== ctsk_tagfirstref
))
5307 warning_at (loc
, OPT_Wc___compat
,
5308 "defining a type in a compound literal is invalid in C++");
5311 /* Determine whether TYPE is a structure with a flexible array member,
5312 or a union containing such a structure (possibly recursively). */
5315 flexible_array_type_p (tree type
)
5318 switch (TREE_CODE (type
))
5321 x
= TYPE_FIELDS (type
);
5324 while (DECL_CHAIN (x
) != NULL_TREE
)
5326 if (TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
5327 && TYPE_SIZE (TREE_TYPE (x
)) == NULL_TREE
5328 && TYPE_DOMAIN (TREE_TYPE (x
)) != NULL_TREE
5329 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x
))) == NULL_TREE
)
5333 for (x
= TYPE_FIELDS (type
); x
!= NULL_TREE
; x
= DECL_CHAIN (x
))
5335 if (flexible_array_type_p (TREE_TYPE (x
)))
5344 /* Performs sanity checks on the TYPE and WIDTH of the bit-field NAME,
5345 replacing with appropriate values if they are invalid. */
5348 check_bitfield_type_and_width (location_t loc
, tree
*type
, tree
*width
,
5352 unsigned int max_width
;
5353 unsigned HOST_WIDE_INT w
;
5354 const char *name
= (orig_name
5355 ? identifier_to_locale (IDENTIFIER_POINTER (orig_name
))
5356 : _("<anonymous>"));
5358 /* Detect and ignore out of range field width and process valid
5360 if (!INTEGRAL_TYPE_P (TREE_TYPE (*width
)))
5362 error_at (loc
, "bit-field %qs width not an integer constant", name
);
5363 *width
= integer_one_node
;
5367 if (TREE_CODE (*width
) != INTEGER_CST
)
5369 *width
= c_fully_fold (*width
, false, NULL
);
5370 if (TREE_CODE (*width
) == INTEGER_CST
)
5371 pedwarn (loc
, OPT_Wpedantic
,
5372 "bit-field %qs width not an integer constant expression",
5375 if (TREE_CODE (*width
) != INTEGER_CST
)
5377 error_at (loc
, "bit-field %qs width not an integer constant", name
);
5378 *width
= integer_one_node
;
5380 constant_expression_warning (*width
);
5381 if (tree_int_cst_sgn (*width
) < 0)
5383 error_at (loc
, "negative width in bit-field %qs", name
);
5384 *width
= integer_one_node
;
5386 else if (integer_zerop (*width
) && orig_name
)
5388 error_at (loc
, "zero width for bit-field %qs", name
);
5389 *width
= integer_one_node
;
5393 /* Detect invalid bit-field type. */
5394 if (TREE_CODE (*type
) != INTEGER_TYPE
5395 && TREE_CODE (*type
) != BOOLEAN_TYPE
5396 && TREE_CODE (*type
) != ENUMERAL_TYPE
)
5398 error_at (loc
, "bit-field %qs has invalid type", name
);
5399 *type
= unsigned_type_node
;
5402 if (TYPE_WARN_IF_NOT_ALIGN (*type
))
5404 error_at (loc
, "cannot declare bit-field %qs with %<warn_if_not_aligned%> type",
5406 *type
= unsigned_type_node
;
5409 type_mv
= TYPE_MAIN_VARIANT (*type
);
5410 if (!in_system_header_at (input_location
)
5411 && type_mv
!= integer_type_node
5412 && type_mv
!= unsigned_type_node
5413 && type_mv
!= boolean_type_node
)
5414 pedwarn_c90 (loc
, OPT_Wpedantic
,
5415 "type of bit-field %qs is a GCC extension", name
);
5417 max_width
= TYPE_PRECISION (*type
);
5419 if (0 < compare_tree_int (*width
, max_width
))
5421 error_at (loc
, "width of %qs exceeds its type", name
);
5423 *width
= build_int_cst (integer_type_node
, w
);
5426 w
= tree_to_uhwi (*width
);
5428 if (TREE_CODE (*type
) == ENUMERAL_TYPE
)
5430 struct lang_type
*lt
= TYPE_LANG_SPECIFIC (*type
);
5432 || w
< tree_int_cst_min_precision (lt
->enum_min
, TYPE_SIGN (*type
))
5433 || w
< tree_int_cst_min_precision (lt
->enum_max
, TYPE_SIGN (*type
)))
5434 warning_at (loc
, 0, "%qs is narrower than values of its type", name
);
5440 /* Print warning about variable length array if necessary. */
5443 warn_variable_length_array (tree name
, tree size
)
5445 if (TREE_CONSTANT (size
))
5448 pedwarn_c90 (input_location
, OPT_Wvla
,
5449 "ISO C90 forbids array %qE whose size "
5450 "can%'t be evaluated", name
);
5452 pedwarn_c90 (input_location
, OPT_Wvla
, "ISO C90 forbids array "
5453 "whose size can%'t be evaluated");
5458 pedwarn_c90 (input_location
, OPT_Wvla
,
5459 "ISO C90 forbids variable length array %qE", name
);
5461 pedwarn_c90 (input_location
, OPT_Wvla
, "ISO C90 forbids variable "
5466 /* Print warning about defaulting to int if necessary. */
5469 warn_defaults_to (location_t location
, int opt
, const char *gmsgid
, ...)
5471 diagnostic_info diagnostic
;
5473 rich_location
richloc (line_table
, location
);
5475 va_start (ap
, gmsgid
);
5476 diagnostic_set_info (&diagnostic
, gmsgid
, &ap
, &richloc
,
5477 flag_isoc99
? DK_PEDWARN
: DK_WARNING
);
5478 diagnostic
.option_index
= opt
;
5479 diagnostic_report_diagnostic (global_dc
, &diagnostic
);
5483 /* Returns the smallest location != UNKNOWN_LOCATION in LOCATIONS,
5484 considering only those c_declspec_words found in LIST, which
5485 must be terminated by cdw_number_of_elements. */
5488 smallest_type_quals_location (const location_t
*locations
,
5489 const c_declspec_word
*list
)
5491 location_t loc
= UNKNOWN_LOCATION
;
5492 while (*list
!= cdw_number_of_elements
)
5494 location_t newloc
= locations
[*list
];
5495 if (loc
== UNKNOWN_LOCATION
5496 || (newloc
!= UNKNOWN_LOCATION
&& newloc
< loc
))
5504 /* Given declspecs and a declarator,
5505 determine the name and type of the object declared
5506 and construct a ..._DECL node for it.
5507 (In one case we can return a ..._TYPE node instead.
5508 For invalid input we sometimes return NULL_TREE.)
5510 DECLSPECS is a c_declspecs structure for the declaration specifiers.
5512 DECL_CONTEXT says which syntactic context this declaration is in:
5513 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
5514 FUNCDEF for a function definition. Like NORMAL but a few different
5515 error messages in each case. Return value may be zero meaning
5516 this definition is too screwy to try to parse.
5517 PARM for a parameter declaration (either within a function prototype
5518 or before a function body). Make a PARM_DECL, or return void_type_node.
5519 TYPENAME if for a typename (in a cast or sizeof).
5520 Don't make a DECL node; just return the ..._TYPE node.
5521 FIELD for a struct or union field; make a FIELD_DECL.
5522 INITIALIZED is true if the decl has an initializer.
5523 WIDTH is non-NULL for bit-fields, and is a pointer to an INTEGER_CST node
5524 representing the width of the bit-field.
5525 DECL_ATTRS points to the list of attributes that should be added to this
5526 decl. Any nested attributes that belong on the decl itself will be
5528 If EXPR is not NULL, any expressions that need to be evaluated as
5529 part of evaluating variably modified types will be stored in *EXPR.
5530 If EXPR_CONST_OPERANDS is not NULL, *EXPR_CONST_OPERANDS will be
5531 set to indicate whether operands in *EXPR can be used in constant
5533 DEPRECATED_STATE is a deprecated_states value indicating whether
5534 deprecation warnings should be suppressed.
5536 In the TYPENAME case, DECLARATOR is really an absolute declarator.
5537 It may also be so in the PARM case, for a prototype where the
5538 argument type is specified but not the name.
5540 This function is where the complicated C meanings of `static'
5541 and `extern' are interpreted. */
5544 grokdeclarator (const struct c_declarator
*declarator
,
5545 struct c_declspecs
*declspecs
,
5546 enum decl_context decl_context
, bool initialized
, tree
*width
,
5547 tree
*decl_attrs
, tree
*expr
, bool *expr_const_operands
,
5548 enum deprecated_states deprecated_state
)
5550 tree type
= declspecs
->type
;
5551 bool threadp
= declspecs
->thread_p
;
5552 enum c_storage_class storage_class
= declspecs
->storage_class
;
5557 int type_quals
= TYPE_UNQUALIFIED
;
5558 tree name
= NULL_TREE
;
5559 bool funcdef_flag
= false;
5560 bool funcdef_syntax
= false;
5561 bool size_varies
= false;
5562 tree decl_attr
= declspecs
->decl_attr
;
5563 int array_ptr_quals
= TYPE_UNQUALIFIED
;
5564 tree array_ptr_attrs
= NULL_TREE
;
5565 bool array_parm_static
= false;
5566 bool array_parm_vla_unspec_p
= false;
5567 tree returned_attrs
= NULL_TREE
;
5568 bool bitfield
= width
!= NULL
;
5570 tree orig_qual_type
= NULL
;
5571 size_t orig_qual_indirect
= 0;
5572 struct c_arg_info
*arg_info
= 0;
5573 addr_space_t as1
, as2
, address_space
;
5574 location_t loc
= UNKNOWN_LOCATION
;
5576 bool expr_const_operands_dummy
;
5577 enum c_declarator_kind first_non_attr_kind
;
5578 unsigned int alignas_align
= 0;
5580 if (TREE_CODE (type
) == ERROR_MARK
)
5581 return error_mark_node
;
5585 expr_dummy
= NULL_TREE
;
5587 if (expr_const_operands
== NULL
)
5588 expr_const_operands
= &expr_const_operands_dummy
;
5590 if (declspecs
->expr
)
5593 *expr
= build2 (COMPOUND_EXPR
, TREE_TYPE (declspecs
->expr
), *expr
,
5596 *expr
= declspecs
->expr
;
5598 *expr_const_operands
= declspecs
->expr_const_operands
;
5600 if (decl_context
== FUNCDEF
)
5601 funcdef_flag
= true, decl_context
= NORMAL
;
5603 /* Look inside a declarator for the name being declared
5604 and get it as an IDENTIFIER_NODE, for an error message. */
5606 const struct c_declarator
*decl
= declarator
;
5608 first_non_attr_kind
= cdk_attrs
;
5618 funcdef_syntax
= (decl
->kind
== cdk_function
);
5619 if (first_non_attr_kind
== cdk_attrs
)
5620 first_non_attr_kind
= decl
->kind
;
5621 decl
= decl
->declarator
;
5625 decl
= decl
->declarator
;
5632 if (first_non_attr_kind
== cdk_attrs
)
5633 first_non_attr_kind
= decl
->kind
;
5640 if (name
== NULL_TREE
)
5642 gcc_assert (decl_context
== PARM
5643 || decl_context
== TYPENAME
5644 || (decl_context
== FIELD
5645 && declarator
->kind
== cdk_id
));
5646 gcc_assert (!initialized
);
5650 /* A function definition's declarator must have the form of
5651 a function declarator. */
5653 if (funcdef_flag
&& !funcdef_syntax
)
5656 /* If this looks like a function definition, make it one,
5657 even if it occurs where parms are expected.
5658 Then store_parm_decls will reject it and not use it as a parm. */
5659 if (decl_context
== NORMAL
&& !funcdef_flag
&& current_scope
->parm_flag
)
5660 decl_context
= PARM
;
5662 if (declspecs
->deprecated_p
&& deprecated_state
!= DEPRECATED_SUPPRESS
)
5663 warn_deprecated_use (declspecs
->type
, declspecs
->decl_attr
);
5665 if ((decl_context
== NORMAL
|| decl_context
== FIELD
)
5666 && current_scope
== file_scope
5667 && variably_modified_type_p (type
, NULL_TREE
))
5670 error_at (loc
, "variably modified %qE at file scope", name
);
5672 error_at (loc
, "variably modified field at file scope");
5673 type
= integer_type_node
;
5676 size_varies
= C_TYPE_VARIABLE_SIZE (type
) != 0;
5678 /* Diagnose defaulting to "int". */
5680 if (declspecs
->default_int_p
&& !in_system_header_at (input_location
))
5682 /* Issue a warning if this is an ISO C 99 program or if
5683 -Wreturn-type and this is a function, or if -Wimplicit;
5684 prefer the former warning since it is more explicit. */
5685 if ((warn_implicit_int
|| warn_return_type
|| flag_isoc99
)
5687 warn_about_return_type
= 1;
5691 warn_defaults_to (loc
, OPT_Wimplicit_int
,
5692 "type defaults to %<int%> in declaration "
5695 warn_defaults_to (loc
, OPT_Wimplicit_int
,
5696 "type defaults to %<int%> in type name");
5700 /* Adjust the type if a bit-field is being declared,
5701 -funsigned-bitfields applied and the type is not explicitly
5703 if (bitfield
&& !flag_signed_bitfields
&& !declspecs
->explicit_signed_p
5704 && TREE_CODE (type
) == INTEGER_TYPE
)
5705 type
= unsigned_type_for (type
);
5707 /* Figure out the type qualifiers for the declaration. There are
5708 two ways a declaration can become qualified. One is something
5709 like `const int i' where the `const' is explicit. Another is
5710 something like `typedef const int CI; CI i' where the type of the
5711 declaration contains the `const'. A third possibility is that
5712 there is a type qualifier on the element type of a typedefed
5713 array type, in which case we should extract that qualifier so
5714 that c_apply_type_quals_to_decl receives the full list of
5715 qualifiers to work with (C90 is not entirely clear about whether
5716 duplicate qualifiers should be diagnosed in this case, but it
5717 seems most appropriate to do so). */
5718 element_type
= strip_array_types (type
);
5719 constp
= declspecs
->const_p
+ TYPE_READONLY (element_type
);
5720 restrictp
= declspecs
->restrict_p
+ TYPE_RESTRICT (element_type
);
5721 volatilep
= declspecs
->volatile_p
+ TYPE_VOLATILE (element_type
);
5722 atomicp
= declspecs
->atomic_p
+ TYPE_ATOMIC (element_type
);
5723 as1
= declspecs
->address_space
;
5724 as2
= TYPE_ADDR_SPACE (element_type
);
5725 address_space
= ADDR_SPACE_GENERIC_P (as1
)? as2
: as1
;
5728 pedwarn_c90 (loc
, OPT_Wpedantic
, "duplicate %<const%>");
5730 pedwarn_c90 (loc
, OPT_Wpedantic
, "duplicate %<restrict%>");
5732 pedwarn_c90 (loc
, OPT_Wpedantic
, "duplicate %<volatile%>");
5734 pedwarn_c90 (loc
, OPT_Wpedantic
, "duplicate %<_Atomic%>");
5736 if (!ADDR_SPACE_GENERIC_P (as1
) && !ADDR_SPACE_GENERIC_P (as2
) && as1
!= as2
)
5737 error_at (loc
, "conflicting named address spaces (%s vs %s)",
5738 c_addr_space_name (as1
), c_addr_space_name (as2
));
5740 if ((TREE_CODE (type
) == ARRAY_TYPE
5741 || first_non_attr_kind
== cdk_array
)
5742 && TYPE_QUALS (element_type
))
5744 orig_qual_type
= type
;
5745 type
= TYPE_MAIN_VARIANT (type
);
5747 type_quals
= ((constp
? TYPE_QUAL_CONST
: 0)
5748 | (restrictp
? TYPE_QUAL_RESTRICT
: 0)
5749 | (volatilep
? TYPE_QUAL_VOLATILE
: 0)
5750 | (atomicp
? TYPE_QUAL_ATOMIC
: 0)
5751 | ENCODE_QUAL_ADDR_SPACE (address_space
));
5752 if (type_quals
!= TYPE_QUALS (element_type
))
5753 orig_qual_type
= NULL_TREE
;
5755 /* Applying the _Atomic qualifier to an array type (through the use
5756 of typedefs or typeof) must be detected here. If the qualifier
5757 is introduced later, any appearance of applying it to an array is
5758 actually applying it to an element of that array. */
5759 if (atomicp
&& TREE_CODE (type
) == ARRAY_TYPE
)
5760 error_at (loc
, "%<_Atomic%>-qualified array type");
5762 /* Warn about storage classes that are invalid for certain
5763 kinds of declarations (parameters, typenames, etc.). */
5767 || storage_class
== csc_auto
5768 || storage_class
== csc_register
5769 || storage_class
== csc_typedef
))
5771 if (storage_class
== csc_auto
)
5773 (current_scope
== file_scope
) ? 0 : OPT_Wpedantic
,
5774 "function definition declared %<auto%>");
5775 if (storage_class
== csc_register
)
5776 error_at (loc
, "function definition declared %<register%>");
5777 if (storage_class
== csc_typedef
)
5778 error_at (loc
, "function definition declared %<typedef%>");
5780 error_at (loc
, "function definition declared %qs",
5781 declspecs
->thread_gnu_p
? "__thread" : "_Thread_local");
5783 if (storage_class
== csc_auto
5784 || storage_class
== csc_register
5785 || storage_class
== csc_typedef
)
5786 storage_class
= csc_none
;
5788 else if (decl_context
!= NORMAL
&& (storage_class
!= csc_none
|| threadp
))
5790 if (decl_context
== PARM
&& storage_class
== csc_register
)
5794 switch (decl_context
)
5798 error_at (loc
, "storage class specified for structure "
5801 error_at (loc
, "storage class specified for structure field");
5805 error_at (loc
, "storage class specified for parameter %qE",
5808 error_at (loc
, "storage class specified for unnamed parameter");
5811 error_at (loc
, "storage class specified for typename");
5814 storage_class
= csc_none
;
5818 else if (storage_class
== csc_extern
5822 /* 'extern' with initialization is invalid if not at file scope. */
5823 if (current_scope
== file_scope
)
5825 /* It is fine to have 'extern const' when compiling at C
5826 and C++ intersection. */
5827 if (!(warn_cxx_compat
&& constp
))
5828 warning_at (loc
, 0, "%qE initialized and declared %<extern%>",
5832 error_at (loc
, "%qE has both %<extern%> and initializer", name
);
5834 else if (current_scope
== file_scope
)
5836 if (storage_class
== csc_auto
)
5837 error_at (loc
, "file-scope declaration of %qE specifies %<auto%>",
5839 if (pedantic
&& storage_class
== csc_register
)
5840 pedwarn (input_location
, OPT_Wpedantic
,
5841 "file-scope declaration of %qE specifies %<register%>", name
);
5845 if (storage_class
== csc_extern
&& funcdef_flag
)
5846 error_at (loc
, "nested function %qE declared %<extern%>", name
);
5847 else if (threadp
&& storage_class
== csc_none
)
5849 error_at (loc
, "function-scope %qE implicitly auto and declared "
5851 declspecs
->thread_gnu_p
? "__thread" : "_Thread_local");
5856 /* Now figure out the structure of the declarator proper.
5857 Descend through it, creating more complex types, until we reach
5858 the declared identifier (or NULL_TREE, in an absolute declarator).
5859 At each stage we maintain an unqualified version of the type
5860 together with any qualifiers that should be applied to it with
5861 c_build_qualified_type; this way, array types including
5862 multidimensional array types are first built up in unqualified
5863 form and then the qualified form is created with
5864 TYPE_MAIN_VARIANT pointing to the unqualified form. */
5866 while (declarator
&& declarator
->kind
!= cdk_id
)
5868 if (type
== error_mark_node
)
5870 declarator
= declarator
->declarator
;
5874 /* Each level of DECLARATOR is either a cdk_array (for ...[..]),
5875 a cdk_pointer (for *...),
5876 a cdk_function (for ...(...)),
5877 a cdk_attrs (for nested attributes),
5878 or a cdk_id (for the name being declared
5879 or the place in an absolute declarator
5880 where the name was omitted).
5881 For the last case, we have just exited the loop.
5883 At this point, TYPE is the type of elements of an array,
5884 or for a function to return, or for a pointer to point to.
5885 After this sequence of ifs, TYPE is the type of the
5886 array or function or pointer, and DECLARATOR has had its
5887 outermost layer removed. */
5889 if (array_ptr_quals
!= TYPE_UNQUALIFIED
5890 || array_ptr_attrs
!= NULL_TREE
5891 || array_parm_static
)
5893 /* Only the innermost declarator (making a parameter be of
5894 array type which is converted to pointer type)
5895 may have static or type qualifiers. */
5896 error_at (loc
, "static or type qualifiers in non-parameter array declarator");
5897 array_ptr_quals
= TYPE_UNQUALIFIED
;
5898 array_ptr_attrs
= NULL_TREE
;
5899 array_parm_static
= false;
5902 switch (declarator
->kind
)
5906 /* A declarator with embedded attributes. */
5907 tree attrs
= declarator
->u
.attrs
;
5908 const struct c_declarator
*inner_decl
;
5910 declarator
= declarator
->declarator
;
5911 inner_decl
= declarator
;
5912 while (inner_decl
->kind
== cdk_attrs
)
5913 inner_decl
= inner_decl
->declarator
;
5914 if (inner_decl
->kind
== cdk_id
)
5915 attr_flags
|= (int) ATTR_FLAG_DECL_NEXT
;
5916 else if (inner_decl
->kind
== cdk_function
)
5917 attr_flags
|= (int) ATTR_FLAG_FUNCTION_NEXT
;
5918 else if (inner_decl
->kind
== cdk_array
)
5919 attr_flags
|= (int) ATTR_FLAG_ARRAY_NEXT
;
5920 returned_attrs
= decl_attributes (&type
,
5921 chainon (returned_attrs
, attrs
),
5927 tree itype
= NULL_TREE
;
5928 tree size
= declarator
->u
.array
.dimen
;
5929 /* The index is a signed object `sizetype' bits wide. */
5930 tree index_type
= c_common_signed_type (sizetype
);
5932 array_ptr_quals
= declarator
->u
.array
.quals
;
5933 array_ptr_attrs
= declarator
->u
.array
.attrs
;
5934 array_parm_static
= declarator
->u
.array
.static_p
;
5935 array_parm_vla_unspec_p
= declarator
->u
.array
.vla_unspec_p
;
5937 declarator
= declarator
->declarator
;
5939 /* Check for some types that there cannot be arrays of. */
5941 if (VOID_TYPE_P (type
))
5944 error_at (loc
, "declaration of %qE as array of voids", name
);
5946 error_at (loc
, "declaration of type name as array of voids");
5947 type
= error_mark_node
;
5950 if (TREE_CODE (type
) == FUNCTION_TYPE
)
5953 error_at (loc
, "declaration of %qE as array of functions",
5956 error_at (loc
, "declaration of type name as array of "
5958 type
= error_mark_node
;
5961 if (pedantic
&& !in_system_header_at (input_location
)
5962 && flexible_array_type_p (type
))
5963 pedwarn (loc
, OPT_Wpedantic
,
5964 "invalid use of structure with flexible array member");
5966 if (size
== error_mark_node
)
5967 type
= error_mark_node
;
5969 if (type
== error_mark_node
)
5972 /* If size was specified, set ITYPE to a range-type for
5973 that size. Otherwise, ITYPE remains null. finish_decl
5974 may figure it out from an initial value. */
5978 bool size_maybe_const
= true;
5979 bool size_int_const
= (TREE_CODE (size
) == INTEGER_CST
5980 && !TREE_OVERFLOW (size
));
5981 bool this_size_varies
= false;
5983 /* Strip NON_LVALUE_EXPRs since we aren't using as an
5985 STRIP_TYPE_NOPS (size
);
5987 if (!INTEGRAL_TYPE_P (TREE_TYPE (size
)))
5990 error_at (loc
, "size of array %qE has non-integer type",
5994 "size of unnamed array has non-integer type");
5995 size
= integer_one_node
;
5997 /* This can happen with enum forward declaration. */
5998 else if (!COMPLETE_TYPE_P (TREE_TYPE (size
)))
6001 error_at (loc
, "size of array %qE has incomplete type",
6004 error_at (loc
, "size of unnamed array has incomplete "
6006 size
= integer_one_node
;
6009 size
= c_fully_fold (size
, false, &size_maybe_const
);
6011 if (pedantic
&& size_maybe_const
&& integer_zerop (size
))
6014 pedwarn (loc
, OPT_Wpedantic
,
6015 "ISO C forbids zero-size array %qE", name
);
6017 pedwarn (loc
, OPT_Wpedantic
,
6018 "ISO C forbids zero-size array");
6021 if (TREE_CODE (size
) == INTEGER_CST
&& size_maybe_const
)
6023 constant_expression_warning (size
);
6024 if (tree_int_cst_sgn (size
) < 0)
6027 error_at (loc
, "size of array %qE is negative", name
);
6029 error_at (loc
, "size of unnamed array is negative");
6030 size
= integer_one_node
;
6032 /* Handle a size folded to an integer constant but
6033 not an integer constant expression. */
6034 if (!size_int_const
)
6036 /* If this is a file scope declaration of an
6037 ordinary identifier, this is invalid code;
6038 diagnosing it here and not subsequently
6039 treating the type as variable-length avoids
6040 more confusing diagnostics later. */
6041 if ((decl_context
== NORMAL
|| decl_context
== FIELD
)
6042 && current_scope
== file_scope
)
6043 pedwarn (input_location
, 0,
6044 "variably modified %qE at file scope",
6047 this_size_varies
= size_varies
= true;
6048 warn_variable_length_array (name
, size
);
6051 else if ((decl_context
== NORMAL
|| decl_context
== FIELD
)
6052 && current_scope
== file_scope
)
6054 error_at (loc
, "variably modified %qE at file scope", name
);
6055 size
= integer_one_node
;
6059 /* Make sure the array size remains visibly
6060 nonconstant even if it is (eg) a const variable
6061 with known value. */
6062 this_size_varies
= size_varies
= true;
6063 warn_variable_length_array (name
, size
);
6064 if (sanitize_flags_p (SANITIZE_VLA
)
6065 && current_function_decl
!= NULL_TREE
6066 && decl_context
== NORMAL
)
6068 /* Evaluate the array size only once. */
6069 size
= save_expr (size
);
6070 size
= c_fully_fold (size
, false, NULL
);
6071 size
= fold_build2 (COMPOUND_EXPR
, TREE_TYPE (size
),
6072 ubsan_instrument_vla (loc
, size
),
6077 if (integer_zerop (size
) && !this_size_varies
)
6079 /* A zero-length array cannot be represented with
6080 an unsigned index type, which is what we'll
6081 get with build_index_type. Create an
6082 open-ended range instead. */
6083 itype
= build_range_type (sizetype
, size
, NULL_TREE
);
6087 /* Arrange for the SAVE_EXPR on the inside of the
6088 MINUS_EXPR, which allows the -1 to get folded
6089 with the +1 that happens when building TYPE_SIZE. */
6091 size
= save_expr (size
);
6092 if (this_size_varies
&& TREE_CODE (size
) == INTEGER_CST
)
6093 size
= build2 (COMPOUND_EXPR
, TREE_TYPE (size
),
6094 integer_zero_node
, size
);
6096 /* Compute the maximum valid index, that is, size
6097 - 1. Do the calculation in index_type, so that
6098 if it is a variable the computations will be
6099 done in the proper mode. */
6100 itype
= fold_build2_loc (loc
, MINUS_EXPR
, index_type
,
6101 convert (index_type
, size
),
6102 convert (index_type
,
6105 /* The above overflows when size does not fit
6107 ??? While a size of INT_MAX+1 technically shouldn't
6108 cause an overflow (because we subtract 1), handling
6109 this case seems like an unnecessary complication. */
6110 if (TREE_CODE (size
) == INTEGER_CST
6111 && !int_fits_type_p (size
, index_type
))
6114 error_at (loc
, "size of array %qE is too large",
6117 error_at (loc
, "size of unnamed array is too large");
6118 type
= error_mark_node
;
6122 itype
= build_index_type (itype
);
6124 if (this_size_varies
)
6127 *expr
= build2 (COMPOUND_EXPR
, TREE_TYPE (size
),
6131 *expr_const_operands
&= size_maybe_const
;
6134 else if (decl_context
== FIELD
)
6136 bool flexible_array_member
= false;
6137 if (array_parm_vla_unspec_p
)
6138 /* Field names can in fact have function prototype
6139 scope so [*] is disallowed here through making
6140 the field variably modified, not through being
6141 something other than a declaration with function
6146 const struct c_declarator
*t
= declarator
;
6147 while (t
->kind
== cdk_attrs
)
6149 flexible_array_member
= (t
->kind
== cdk_id
);
6151 if (flexible_array_member
6152 && !in_system_header_at (input_location
))
6153 pedwarn_c90 (loc
, OPT_Wpedantic
, "ISO C90 does not "
6154 "support flexible array members");
6156 /* ISO C99 Flexible array members are effectively
6157 identical to GCC's zero-length array extension. */
6158 if (flexible_array_member
|| array_parm_vla_unspec_p
)
6159 itype
= build_range_type (sizetype
, size_zero_node
,
6162 else if (decl_context
== PARM
)
6164 if (array_parm_vla_unspec_p
)
6166 itype
= build_range_type (sizetype
, size_zero_node
, NULL_TREE
);
6170 else if (decl_context
== TYPENAME
)
6172 if (array_parm_vla_unspec_p
)
6175 warning (0, "%<[*]%> not in a declaration");
6176 /* We use this to avoid messing up with incomplete
6177 array types of the same type, that would
6178 otherwise be modified below. */
6179 itype
= build_range_type (sizetype
, size_zero_node
,
6185 /* Complain about arrays of incomplete types. */
6186 if (!COMPLETE_TYPE_P (type
))
6188 error_at (loc
, "array type has incomplete element type %qT",
6190 /* See if we can be more helpful. */
6191 if (TREE_CODE (type
) == ARRAY_TYPE
)
6194 inform (loc
, "declaration of %qE as multidimensional "
6195 "array must have bounds for all dimensions "
6196 "except the first", name
);
6198 inform (loc
, "declaration of multidimensional array "
6199 "must have bounds for all dimensions except "
6202 type
= error_mark_node
;
6205 /* When itype is NULL, a shared incomplete array type is
6206 returned for all array of a given type. Elsewhere we
6207 make sure we don't complete that type before copying
6208 it, but here we want to make sure we don't ever
6209 modify the shared type, so we gcc_assert (itype)
6212 addr_space_t as
= DECODE_QUAL_ADDR_SPACE (type_quals
);
6213 if (!ADDR_SPACE_GENERIC_P (as
) && as
!= TYPE_ADDR_SPACE (type
))
6214 type
= build_qualified_type (type
,
6215 ENCODE_QUAL_ADDR_SPACE (as
));
6217 type
= build_array_type (type
, itype
);
6220 if (type
!= error_mark_node
)
6224 /* It is ok to modify type here even if itype is
6225 NULL: if size_varies, we're in a
6226 multi-dimensional array and the inner type has
6227 variable size, so the enclosing shared array type
6229 if (size
&& TREE_CODE (size
) == INTEGER_CST
)
6231 = build_distinct_type_copy (TYPE_MAIN_VARIANT (type
));
6232 C_TYPE_VARIABLE_SIZE (type
) = 1;
6235 /* The GCC extension for zero-length arrays differs from
6236 ISO flexible array members in that sizeof yields
6238 if (size
&& integer_zerop (size
))
6241 type
= build_distinct_type_copy (TYPE_MAIN_VARIANT (type
));
6242 TYPE_SIZE (type
) = bitsize_zero_node
;
6243 TYPE_SIZE_UNIT (type
) = size_zero_node
;
6244 SET_TYPE_STRUCTURAL_EQUALITY (type
);
6246 if (array_parm_vla_unspec_p
)
6249 /* The type is complete. C99 6.7.5.2p4 */
6250 type
= build_distinct_type_copy (TYPE_MAIN_VARIANT (type
));
6251 TYPE_SIZE (type
) = bitsize_zero_node
;
6252 TYPE_SIZE_UNIT (type
) = size_zero_node
;
6253 SET_TYPE_STRUCTURAL_EQUALITY (type
);
6256 if (!valid_array_size_p (loc
, type
, name
))
6257 type
= error_mark_node
;
6260 if (decl_context
!= PARM
6261 && (array_ptr_quals
!= TYPE_UNQUALIFIED
6262 || array_ptr_attrs
!= NULL_TREE
6263 || array_parm_static
))
6265 error_at (loc
, "static or type qualifiers in non-parameter "
6266 "array declarator");
6267 array_ptr_quals
= TYPE_UNQUALIFIED
;
6268 array_ptr_attrs
= NULL_TREE
;
6269 array_parm_static
= false;
6271 orig_qual_indirect
++;
6276 /* Say it's a definition only for the declarator closest
6277 to the identifier, apart possibly from some
6279 bool really_funcdef
= false;
6281 orig_qual_type
= NULL_TREE
;
6284 const struct c_declarator
*t
= declarator
->declarator
;
6285 while (t
->kind
== cdk_attrs
)
6287 really_funcdef
= (t
->kind
== cdk_id
);
6290 /* Declaring a function type. Make sure we have a valid
6291 type for the function to return. */
6292 if (type
== error_mark_node
)
6295 size_varies
= false;
6297 /* Warn about some types functions can't return. */
6298 if (TREE_CODE (type
) == FUNCTION_TYPE
)
6301 error_at (loc
, "%qE declared as function returning a "
6304 error_at (loc
, "type name declared as function "
6305 "returning a function");
6306 type
= integer_type_node
;
6308 if (TREE_CODE (type
) == ARRAY_TYPE
)
6311 error_at (loc
, "%qE declared as function returning an array",
6314 error_at (loc
, "type name declared as function returning "
6316 type
= integer_type_node
;
6319 /* Construct the function type and go to the next
6320 inner layer of declarator. */
6321 arg_info
= declarator
->u
.arg_info
;
6322 arg_types
= grokparms (arg_info
, really_funcdef
);
6324 /* Type qualifiers before the return type of the function
6325 qualify the return type, not the function type. */
6328 const enum c_declspec_word ignored_quals_list
[] =
6330 cdw_const
, cdw_volatile
, cdw_restrict
, cdw_address_space
,
6331 cdw_atomic
, cdw_number_of_elements
6333 location_t specs_loc
6334 = smallest_type_quals_location (declspecs
->locations
,
6335 ignored_quals_list
);
6336 if (specs_loc
== UNKNOWN_LOCATION
)
6337 specs_loc
= declspecs
->locations
[cdw_typedef
];
6338 if (specs_loc
== UNKNOWN_LOCATION
)
6341 /* Type qualifiers on a function return type are
6342 normally permitted by the standard but have no
6343 effect, so give a warning at -Wreturn-type.
6344 Qualifiers on a void return type are banned on
6345 function definitions in ISO C; GCC used to used
6346 them for noreturn functions. The resolution of C11
6347 DR#423 means qualifiers (other than _Atomic) are
6348 actually removed from the return type when
6349 determining the function type. */
6350 int quals_used
= type_quals
;
6352 quals_used
&= TYPE_QUAL_ATOMIC
;
6353 if (quals_used
&& VOID_TYPE_P (type
) && really_funcdef
)
6354 pedwarn (specs_loc
, 0,
6355 "function definition has qualified void return type");
6357 warning_at (specs_loc
, OPT_Wignored_qualifiers
,
6358 "type qualifiers ignored on function return type");
6360 /* Ensure an error for restrict on invalid types; the
6361 DR#423 resolution is not entirely clear about
6364 && (type_quals
& TYPE_QUAL_RESTRICT
)
6365 && (!POINTER_TYPE_P (type
)
6366 || !C_TYPE_OBJECT_OR_INCOMPLETE_P (TREE_TYPE (type
))))
6367 error_at (loc
, "invalid use of %<restrict%>");
6369 type
= c_build_qualified_type (type
, quals_used
);
6371 type_quals
= TYPE_UNQUALIFIED
;
6373 type
= build_function_type (type
, arg_types
);
6374 declarator
= declarator
->declarator
;
6376 /* Set the TYPE_CONTEXTs for each tagged type which is local to
6377 the formal parameter list of this FUNCTION_TYPE to point to
6378 the FUNCTION_TYPE node itself. */
6383 FOR_EACH_VEC_SAFE_ELT_REVERSE (arg_info
->tags
, ix
, tag
)
6384 TYPE_CONTEXT (tag
->type
) = type
;
6390 /* Merge any constancy or volatility into the target type
6392 if ((type_quals
& TYPE_QUAL_ATOMIC
)
6393 && TREE_CODE (type
) == FUNCTION_TYPE
)
6396 "%<_Atomic%>-qualified function type");
6397 type_quals
&= ~TYPE_QUAL_ATOMIC
;
6399 else if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
6401 pedwarn (loc
, OPT_Wpedantic
,
6402 "ISO C forbids qualified function types");
6404 type
= c_build_qualified_type (type
, type_quals
, orig_qual_type
,
6405 orig_qual_indirect
);
6406 orig_qual_type
= NULL_TREE
;
6407 size_varies
= false;
6409 /* When the pointed-to type involves components of variable size,
6410 care must be taken to ensure that the size evaluation code is
6411 emitted early enough to dominate all the possible later uses
6412 and late enough for the variables on which it depends to have
6415 This is expected to happen automatically when the pointed-to
6416 type has a name/declaration of it's own, but special attention
6417 is required if the type is anonymous.
6419 We handle the NORMAL and FIELD contexts here by attaching an
6420 artificial TYPE_DECL to such pointed-to type. This forces the
6421 sizes evaluation at a safe point and ensures it is not deferred
6422 until e.g. within a deeper conditional context.
6424 We expect nothing to be needed here for PARM or TYPENAME.
6425 Pushing a TYPE_DECL at this point for TYPENAME would actually
6426 be incorrect, as we might be in the middle of an expression
6427 with side effects on the pointed-to type size "arguments" prior
6428 to the pointer declaration point and the fake TYPE_DECL in the
6429 enclosing context would force the size evaluation prior to the
6432 if (!TYPE_NAME (type
)
6433 && (decl_context
== NORMAL
|| decl_context
== FIELD
)
6434 && variably_modified_type_p (type
, NULL_TREE
))
6436 tree decl
= build_decl (loc
, TYPE_DECL
, NULL_TREE
, type
);
6437 DECL_ARTIFICIAL (decl
) = 1;
6439 finish_decl (decl
, loc
, NULL_TREE
, NULL_TREE
, NULL_TREE
);
6440 TYPE_NAME (type
) = decl
;
6443 type
= c_build_pointer_type (type
);
6445 /* Process type qualifiers (such as const or volatile)
6446 that were given inside the `*'. */
6447 type_quals
= declarator
->u
.pointer_quals
;
6449 declarator
= declarator
->declarator
;
6456 *decl_attrs
= chainon (returned_attrs
, *decl_attrs
);
6458 /* Now TYPE has the actual type, apart from any qualifiers in
6461 /* Warn about address space used for things other than static memory or
6463 address_space
= DECODE_QUAL_ADDR_SPACE (type_quals
);
6464 if (!ADDR_SPACE_GENERIC_P (address_space
))
6466 if (decl_context
== NORMAL
)
6468 switch (storage_class
)
6471 error ("%qs combined with %<auto%> qualifier for %qE",
6472 c_addr_space_name (address_space
), name
);
6475 error ("%qs combined with %<register%> qualifier for %qE",
6476 c_addr_space_name (address_space
), name
);
6479 if (current_function_scope
)
6481 error ("%qs specified for auto variable %qE",
6482 c_addr_space_name (address_space
), name
);
6494 else if (decl_context
== PARM
&& TREE_CODE (type
) != ARRAY_TYPE
)
6497 error ("%qs specified for parameter %qE",
6498 c_addr_space_name (address_space
), name
);
6500 error ("%qs specified for unnamed parameter",
6501 c_addr_space_name (address_space
));
6503 else if (decl_context
== FIELD
)
6506 error ("%qs specified for structure field %qE",
6507 c_addr_space_name (address_space
), name
);
6509 error ("%qs specified for structure field",
6510 c_addr_space_name (address_space
));
6514 /* Check the type and width of a bit-field. */
6517 check_bitfield_type_and_width (loc
, &type
, width
, name
);
6518 /* C11 makes it implementation-defined (6.7.2.1#5) whether
6519 atomic types are permitted for bit-fields; we have no code to
6520 make bit-field accesses atomic, so disallow them. */
6521 if (type_quals
& TYPE_QUAL_ATOMIC
)
6524 error_at (loc
, "bit-field %qE has atomic type", name
);
6526 error_at (loc
, "bit-field has atomic type");
6527 type_quals
&= ~TYPE_QUAL_ATOMIC
;
6531 /* Reject invalid uses of _Alignas. */
6532 if (declspecs
->alignas_p
)
6534 if (storage_class
== csc_typedef
)
6535 error_at (loc
, "alignment specified for typedef %qE", name
);
6536 else if (storage_class
== csc_register
)
6537 error_at (loc
, "alignment specified for %<register%> object %qE",
6539 else if (decl_context
== PARM
)
6542 error_at (loc
, "alignment specified for parameter %qE", name
);
6544 error_at (loc
, "alignment specified for unnamed parameter");
6549 error_at (loc
, "alignment specified for bit-field %qE", name
);
6551 error_at (loc
, "alignment specified for unnamed bit-field");
6553 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
6554 error_at (loc
, "alignment specified for function %qE", name
);
6555 else if (declspecs
->align_log
!= -1 && TYPE_P (type
))
6557 alignas_align
= 1U << declspecs
->align_log
;
6558 if (alignas_align
< min_align_of_type (type
))
6561 error_at (loc
, "%<_Alignas%> specifiers cannot reduce "
6562 "alignment of %qE", name
);
6564 error_at (loc
, "%<_Alignas%> specifiers cannot reduce "
6565 "alignment of unnamed field");
6571 /* If this is declaring a typedef name, return a TYPE_DECL. */
6573 if (storage_class
== csc_typedef
)
6576 if ((type_quals
& TYPE_QUAL_ATOMIC
)
6577 && TREE_CODE (type
) == FUNCTION_TYPE
)
6580 "%<_Atomic%>-qualified function type");
6581 type_quals
&= ~TYPE_QUAL_ATOMIC
;
6583 else if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
6585 pedwarn (loc
, OPT_Wpedantic
,
6586 "ISO C forbids qualified function types");
6588 type
= c_build_qualified_type (type
, type_quals
, orig_qual_type
,
6589 orig_qual_indirect
);
6590 decl
= build_decl (declarator
->id_loc
,
6591 TYPE_DECL
, declarator
->u
.id
, type
);
6592 if (declspecs
->explicit_signed_p
)
6593 C_TYPEDEF_EXPLICITLY_SIGNED (decl
) = 1;
6594 if (declspecs
->inline_p
)
6595 pedwarn (loc
, 0,"typedef %q+D declared %<inline%>", decl
);
6596 if (declspecs
->noreturn_p
)
6597 pedwarn (loc
, 0,"typedef %q+D declared %<_Noreturn%>", decl
);
6599 if (warn_cxx_compat
&& declarator
->u
.id
!= NULL_TREE
)
6601 struct c_binding
*b
= I_TAG_BINDING (declarator
->u
.id
);
6604 && b
->decl
!= NULL_TREE
6605 && (B_IN_CURRENT_SCOPE (b
)
6606 || (current_scope
== file_scope
&& B_IN_EXTERNAL_SCOPE (b
)))
6607 && TYPE_MAIN_VARIANT (b
->decl
) != TYPE_MAIN_VARIANT (type
))
6609 if (warning_at (declarator
->id_loc
, OPT_Wc___compat
,
6610 ("using %qD as both a typedef and a tag is "
6611 "invalid in C++"), decl
)
6612 && b
->locus
!= UNKNOWN_LOCATION
)
6613 inform (b
->locus
, "originally defined here");
6620 /* If this is a type name (such as, in a cast or sizeof),
6621 compute the type and return it now. */
6623 if (decl_context
== TYPENAME
)
6625 /* Note that the grammar rejects storage classes in typenames
6627 gcc_assert (storage_class
== csc_none
&& !threadp
6628 && !declspecs
->inline_p
&& !declspecs
->noreturn_p
);
6629 if ((type_quals
& TYPE_QUAL_ATOMIC
)
6630 && TREE_CODE (type
) == FUNCTION_TYPE
)
6633 "%<_Atomic%>-qualified function type");
6634 type_quals
&= ~TYPE_QUAL_ATOMIC
;
6636 else if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
6638 pedwarn (loc
, OPT_Wpedantic
,
6639 "ISO C forbids const or volatile function types");
6641 type
= c_build_qualified_type (type
, type_quals
, orig_qual_type
,
6642 orig_qual_indirect
);
6646 if (pedantic
&& decl_context
== FIELD
6647 && variably_modified_type_p (type
, NULL_TREE
))
6650 pedwarn (loc
, OPT_Wpedantic
, "a member of a structure or union cannot "
6651 "have a variably modified type");
6654 /* Aside from typedefs and type names (handle above),
6655 `void' at top level (not within pointer)
6656 is allowed only in public variables.
6657 We don't complain about parms either, but that is because
6658 a better error message can be made later. */
6660 if (VOID_TYPE_P (type
) && decl_context
!= PARM
6661 && !((decl_context
!= FIELD
&& TREE_CODE (type
) != FUNCTION_TYPE
)
6662 && (storage_class
== csc_extern
6663 || (current_scope
== file_scope
6664 && !(storage_class
== csc_static
6665 || storage_class
== csc_register
)))))
6667 error_at (loc
, "variable or field %qE declared void", name
);
6668 type
= integer_type_node
;
6671 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
6672 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
6677 if (decl_context
== PARM
)
6680 bool array_parameter_p
= false;
6682 /* A parameter declared as an array of T is really a pointer to T.
6683 One declared as a function is really a pointer to a function. */
6685 if (TREE_CODE (type
) == ARRAY_TYPE
)
6687 /* Transfer const-ness of array into that of type pointed to. */
6688 type
= TREE_TYPE (type
);
6689 if (orig_qual_type
!= NULL_TREE
)
6691 if (orig_qual_indirect
== 0)
6692 orig_qual_type
= TREE_TYPE (orig_qual_type
);
6694 orig_qual_indirect
--;
6697 type
= c_build_qualified_type (type
, type_quals
, orig_qual_type
,
6698 orig_qual_indirect
);
6699 type
= c_build_pointer_type (type
);
6700 type_quals
= array_ptr_quals
;
6702 type
= c_build_qualified_type (type
, type_quals
);
6704 /* We don't yet implement attributes in this context. */
6705 if (array_ptr_attrs
!= NULL_TREE
)
6706 warning_at (loc
, OPT_Wattributes
,
6707 "attributes in parameter array declarator ignored");
6709 size_varies
= false;
6710 array_parameter_p
= true;
6712 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
6714 if (type_quals
& TYPE_QUAL_ATOMIC
)
6717 "%<_Atomic%>-qualified function type");
6718 type_quals
&= ~TYPE_QUAL_ATOMIC
;
6720 else if (type_quals
)
6721 pedwarn (loc
, OPT_Wpedantic
,
6722 "ISO C forbids qualified function types");
6724 type
= c_build_qualified_type (type
, type_quals
);
6725 type
= c_build_pointer_type (type
);
6726 type_quals
= TYPE_UNQUALIFIED
;
6728 else if (type_quals
)
6729 type
= c_build_qualified_type (type
, type_quals
);
6731 decl
= build_decl (declarator
->id_loc
,
6732 PARM_DECL
, declarator
->u
.id
, type
);
6734 C_DECL_VARIABLE_SIZE (decl
) = 1;
6735 C_ARRAY_PARAMETER (decl
) = array_parameter_p
;
6737 /* Compute the type actually passed in the parmlist,
6738 for the case where there is no prototype.
6739 (For example, shorts and chars are passed as ints.)
6740 When there is a prototype, this is overridden later. */
6742 if (type
== error_mark_node
)
6743 promoted_type
= type
;
6745 promoted_type
= c_type_promotes_to (type
);
6747 DECL_ARG_TYPE (decl
) = promoted_type
;
6748 if (declspecs
->inline_p
)
6749 pedwarn (loc
, 0, "parameter %q+D declared %<inline%>", decl
);
6750 if (declspecs
->noreturn_p
)
6751 pedwarn (loc
, 0, "parameter %q+D declared %<_Noreturn%>", decl
);
6753 else if (decl_context
== FIELD
)
6755 /* Note that the grammar rejects storage classes in typenames
6757 gcc_assert (storage_class
== csc_none
&& !threadp
6758 && !declspecs
->inline_p
&& !declspecs
->noreturn_p
);
6760 /* Structure field. It may not be a function. */
6762 if (TREE_CODE (type
) == FUNCTION_TYPE
)
6764 error_at (loc
, "field %qE declared as a function", name
);
6765 type
= build_pointer_type (type
);
6767 else if (TREE_CODE (type
) != ERROR_MARK
6768 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type
))
6771 error_at (loc
, "field %qE has incomplete type", name
);
6773 error_at (loc
, "unnamed field has incomplete type");
6774 type
= error_mark_node
;
6776 else if (TREE_CODE (type
) == ARRAY_TYPE
6777 && TYPE_DOMAIN (type
) == NULL_TREE
)
6779 /* We have a flexible array member through a typedef.
6780 Set suitable range. Whether this is a correct position
6781 for a flexible array member will be determined elsewhere. */
6782 if (!in_system_header_at (input_location
))
6783 pedwarn_c90 (loc
, OPT_Wpedantic
, "ISO C90 does not "
6784 "support flexible array members");
6785 type
= build_distinct_type_copy (TYPE_MAIN_VARIANT (type
));
6786 TYPE_DOMAIN (type
) = build_range_type (sizetype
, size_zero_node
,
6788 if (orig_qual_indirect
== 0)
6789 orig_qual_type
= NULL_TREE
;
6791 type
= c_build_qualified_type (type
, type_quals
, orig_qual_type
,
6792 orig_qual_indirect
);
6793 decl
= build_decl (declarator
->id_loc
,
6794 FIELD_DECL
, declarator
->u
.id
, type
);
6795 DECL_NONADDRESSABLE_P (decl
) = bitfield
;
6796 if (bitfield
&& !declarator
->u
.id
)
6797 TREE_NO_WARNING (decl
) = 1;
6800 C_DECL_VARIABLE_SIZE (decl
) = 1;
6802 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
6804 if (storage_class
== csc_register
|| threadp
)
6806 error_at (loc
, "invalid storage class for function %qE", name
);
6808 else if (current_scope
!= file_scope
)
6810 /* Function declaration not at file scope. Storage
6811 classes other than `extern' are not allowed, C99
6812 6.7.1p5, and `extern' makes no difference. However,
6813 GCC allows 'auto', perhaps with 'inline', to support
6814 nested functions. */
6815 if (storage_class
== csc_auto
)
6816 pedwarn (loc
, OPT_Wpedantic
,
6817 "invalid storage class for function %qE", name
);
6818 else if (storage_class
== csc_static
)
6820 error_at (loc
, "invalid storage class for function %qE", name
);
6822 storage_class
= declspecs
->storage_class
= csc_none
;
6828 decl
= build_decl (declarator
->id_loc
,
6829 FUNCTION_DECL
, declarator
->u
.id
, type
);
6830 decl
= build_decl_attribute_variant (decl
, decl_attr
);
6832 if (type_quals
& TYPE_QUAL_ATOMIC
)
6835 "%<_Atomic%>-qualified function type");
6836 type_quals
&= ~TYPE_QUAL_ATOMIC
;
6838 else if (pedantic
&& type_quals
&& !DECL_IN_SYSTEM_HEADER (decl
))
6839 pedwarn (loc
, OPT_Wpedantic
,
6840 "ISO C forbids qualified function types");
6842 /* Every function declaration is an external reference
6843 (DECL_EXTERNAL) except for those which are not at file
6844 scope and are explicitly declared "auto". This is
6845 forbidden by standard C (C99 6.7.1p5) and is interpreted by
6846 GCC to signify a forward declaration of a nested function. */
6847 if (storage_class
== csc_auto
&& current_scope
!= file_scope
)
6848 DECL_EXTERNAL (decl
) = 0;
6849 /* In C99, a function which is declared 'inline' with 'extern'
6850 is not an external reference (which is confusing). It
6851 means that the later definition of the function must be output
6852 in this file, C99 6.7.4p6. In GNU C89, a function declared
6853 'extern inline' is an external reference. */
6854 else if (declspecs
->inline_p
&& storage_class
!= csc_static
)
6855 DECL_EXTERNAL (decl
) = ((storage_class
== csc_extern
)
6856 == flag_gnu89_inline
);
6858 DECL_EXTERNAL (decl
) = !initialized
;
6860 /* Record absence of global scope for `static' or `auto'. */
6862 = !(storage_class
== csc_static
|| storage_class
== csc_auto
);
6864 /* For a function definition, record the argument information
6865 block where store_parm_decls will look for it. */
6867 current_function_arg_info
= arg_info
;
6869 if (declspecs
->default_int_p
)
6870 C_FUNCTION_IMPLICIT_INT (decl
) = 1;
6872 /* Record presence of `inline' and `_Noreturn', if it is
6874 if (flag_hosted
&& MAIN_NAME_P (declarator
->u
.id
))
6876 if (declspecs
->inline_p
)
6877 pedwarn (loc
, 0, "cannot inline function %<main%>");
6878 if (declspecs
->noreturn_p
)
6879 pedwarn (loc
, 0, "%<main%> declared %<_Noreturn%>");
6883 if (declspecs
->inline_p
)
6884 /* Record that the function is declared `inline'. */
6885 DECL_DECLARED_INLINE_P (decl
) = 1;
6886 if (declspecs
->noreturn_p
)
6889 pedwarn_c99 (loc
, OPT_Wpedantic
,
6890 "ISO C99 does not support %<_Noreturn%>");
6892 pedwarn_c99 (loc
, OPT_Wpedantic
,
6893 "ISO C90 does not support %<_Noreturn%>");
6894 TREE_THIS_VOLATILE (decl
) = 1;
6900 /* It's a variable. */
6901 /* An uninitialized decl with `extern' is a reference. */
6902 int extern_ref
= !initialized
&& storage_class
== csc_extern
;
6904 type
= c_build_qualified_type (type
, type_quals
, orig_qual_type
,
6905 orig_qual_indirect
);
6907 /* C99 6.2.2p7: It is invalid (compile-time undefined
6908 behavior) to create an 'extern' declaration for a
6909 variable if there is a global declaration that is
6910 'static' and the global declaration is not visible.
6911 (If the static declaration _is_ currently visible,
6912 the 'extern' declaration is taken to refer to that decl.) */
6913 if (extern_ref
&& current_scope
!= file_scope
)
6915 tree global_decl
= identifier_global_value (declarator
->u
.id
);
6916 tree visible_decl
= lookup_name (declarator
->u
.id
);
6919 && global_decl
!= visible_decl
6920 && VAR_P (global_decl
)
6921 && !TREE_PUBLIC (global_decl
))
6922 error_at (loc
, "variable previously declared %<static%> "
6923 "redeclared %<extern%>");
6926 decl
= build_decl (declarator
->id_loc
,
6927 VAR_DECL
, declarator
->u
.id
, type
);
6929 C_DECL_VARIABLE_SIZE (decl
) = 1;
6931 if (declspecs
->inline_p
)
6932 pedwarn (loc
, 0, "variable %q+D declared %<inline%>", decl
);
6933 if (declspecs
->noreturn_p
)
6934 pedwarn (loc
, 0, "variable %q+D declared %<_Noreturn%>", decl
);
6936 /* At file scope, an initialized extern declaration may follow
6937 a static declaration. In that case, DECL_EXTERNAL will be
6938 reset later in start_decl. */
6939 DECL_EXTERNAL (decl
) = (storage_class
== csc_extern
);
6941 /* At file scope, the presence of a `static' or `register' storage
6942 class specifier, or the absence of all storage class specifiers
6943 makes this declaration a definition (perhaps tentative). Also,
6944 the absence of `static' makes it public. */
6945 if (current_scope
== file_scope
)
6947 TREE_PUBLIC (decl
) = storage_class
!= csc_static
;
6948 TREE_STATIC (decl
) = !extern_ref
;
6950 /* Not at file scope, only `static' makes a static definition. */
6953 TREE_STATIC (decl
) = (storage_class
== csc_static
);
6954 TREE_PUBLIC (decl
) = extern_ref
;
6958 set_decl_tls_model (decl
, decl_default_tls_model (decl
));
6961 if ((storage_class
== csc_extern
6962 || (storage_class
== csc_none
6963 && TREE_CODE (type
) == FUNCTION_TYPE
6965 && variably_modified_type_p (type
, NULL_TREE
))
6968 if (TREE_CODE (type
) == FUNCTION_TYPE
)
6969 error_at (loc
, "non-nested function with variably modified type");
6971 error_at (loc
, "object with variably modified type must have "
6975 /* Record `register' declaration for warnings on &
6976 and in case doing stupid register allocation. */
6978 if (storage_class
== csc_register
)
6980 C_DECL_REGISTER (decl
) = 1;
6981 DECL_REGISTER (decl
) = 1;
6984 /* Record constancy and volatility. */
6985 c_apply_type_quals_to_decl (type_quals
, decl
);
6987 /* Apply _Alignas specifiers. */
6990 SET_DECL_ALIGN (decl
, alignas_align
* BITS_PER_UNIT
);
6991 DECL_USER_ALIGN (decl
) = 1;
6994 /* If a type has volatile components, it should be stored in memory.
6995 Otherwise, the fact that those components are volatile
6996 will be ignored, and would even crash the compiler.
6997 Of course, this only makes sense on VAR,PARM, and RESULT decl's. */
6998 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl
))
6999 && (VAR_P (decl
) || TREE_CODE (decl
) == PARM_DECL
7000 || TREE_CODE (decl
) == RESULT_DECL
))
7002 /* It is not an error for a structure with volatile fields to
7003 be declared register, but reset DECL_REGISTER since it
7004 cannot actually go in a register. */
7005 int was_reg
= C_DECL_REGISTER (decl
);
7006 C_DECL_REGISTER (decl
) = 0;
7007 DECL_REGISTER (decl
) = 0;
7008 c_mark_addressable (decl
);
7009 C_DECL_REGISTER (decl
) = was_reg
;
7012 /* This is the earliest point at which we might know the assembler
7013 name of a variable. Thus, if it's known before this, die horribly. */
7014 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl
));
7018 && TREE_PUBLIC (decl
)
7019 && TREE_STATIC (decl
)
7020 && (RECORD_OR_UNION_TYPE_P (TREE_TYPE (decl
))
7021 || TREE_CODE (TREE_TYPE (decl
)) == ENUMERAL_TYPE
)
7022 && TYPE_NAME (TREE_TYPE (decl
)) == NULL_TREE
)
7023 warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wc___compat
,
7024 ("non-local variable %qD with anonymous type is "
7025 "questionable in C++"),
7032 /* Decode the parameter-list info for a function type or function definition.
7033 The argument is the value returned by `get_parm_info' (or made in c-parse.c
7034 if there is an identifier list instead of a parameter decl list).
7035 These two functions are separate because when a function returns
7036 or receives functions then each is called multiple times but the order
7037 of calls is different. The last call to `grokparms' is always the one
7038 that contains the formal parameter names of a function definition.
7040 Return a list of arg types to use in the FUNCTION_TYPE for this function.
7042 FUNCDEF_FLAG is true for a function definition, false for
7043 a mere declaration. A nonempty identifier-list gets an error message
7044 when FUNCDEF_FLAG is false. */
7047 grokparms (struct c_arg_info
*arg_info
, bool funcdef_flag
)
7049 tree arg_types
= arg_info
->types
;
7051 if (funcdef_flag
&& arg_info
->had_vla_unspec
)
7053 /* A function definition isn't function prototype scope C99 6.2.1p4. */
7055 error ("%<[*]%> not allowed in other than function prototype scope");
7058 if (arg_types
== NULL_TREE
&& !funcdef_flag
7059 && !in_system_header_at (input_location
))
7060 warning (OPT_Wstrict_prototypes
,
7061 "function declaration isn%'t a prototype");
7063 if (arg_types
== error_mark_node
)
7064 /* Don't set TYPE_ARG_TYPES in this case. */
7067 else if (arg_types
&& TREE_CODE (TREE_VALUE (arg_types
)) == IDENTIFIER_NODE
)
7071 pedwarn (input_location
, 0, "parameter names (without types) in "
7072 "function declaration");
7073 arg_info
->parms
= NULL_TREE
;
7076 arg_info
->parms
= arg_info
->types
;
7078 arg_info
->types
= NULL_TREE
;
7083 tree parm
, type
, typelt
;
7084 unsigned int parmno
;
7086 /* If there is a parameter of incomplete type in a definition,
7087 this is an error. In a declaration this is valid, and a
7088 struct or union type may be completed later, before any calls
7089 or definition of the function. In the case where the tag was
7090 first declared within the parameter list, a warning has
7091 already been given. If a parameter has void type, then
7092 however the function cannot be defined or called, so
7095 for (parm
= arg_info
->parms
, typelt
= arg_types
, parmno
= 1;
7097 parm
= DECL_CHAIN (parm
), typelt
= TREE_CHAIN (typelt
), parmno
++)
7099 type
= TREE_VALUE (typelt
);
7100 if (type
== error_mark_node
)
7103 if (!COMPLETE_TYPE_P (type
))
7107 if (DECL_NAME (parm
))
7108 error_at (input_location
,
7109 "parameter %u (%q+D) has incomplete type",
7112 error_at (DECL_SOURCE_LOCATION (parm
),
7113 "parameter %u has incomplete type",
7116 TREE_VALUE (typelt
) = error_mark_node
;
7117 TREE_TYPE (parm
) = error_mark_node
;
7118 arg_types
= NULL_TREE
;
7120 else if (VOID_TYPE_P (type
))
7122 if (DECL_NAME (parm
))
7123 warning_at (input_location
, 0,
7124 "parameter %u (%q+D) has void type",
7127 warning_at (DECL_SOURCE_LOCATION (parm
), 0,
7128 "parameter %u has void type",
7133 if (DECL_NAME (parm
) && TREE_USED (parm
))
7134 warn_if_shadowing (parm
);
7140 /* Allocate and initialize a c_arg_info structure from the parser's
7144 build_arg_info (void)
7146 struct c_arg_info
*ret
= XOBNEW (&parser_obstack
, struct c_arg_info
);
7147 ret
->parms
= NULL_TREE
;
7149 ret
->types
= NULL_TREE
;
7150 ret
->others
= NULL_TREE
;
7151 ret
->pending_sizes
= NULL
;
7152 ret
->had_vla_unspec
= 0;
7156 /* Take apart the current scope and return a c_arg_info structure with
7157 info on a parameter list just parsed.
7159 This structure is later fed to 'grokparms' and 'store_parm_decls'.
7161 ELLIPSIS being true means the argument list ended in '...' so don't
7162 append a sentinel (void_list_node) to the end of the type-list.
7164 EXPR is NULL or an expression that needs to be evaluated for the
7165 side effects of array size expressions in the parameters. */
7168 get_parm_info (bool ellipsis
, tree expr
)
7170 struct c_binding
*b
= current_scope
->bindings
;
7171 struct c_arg_info
*arg_info
= build_arg_info ();
7173 tree parms
= NULL_TREE
;
7174 vec
<c_arg_tag
, va_gc
> *tags
= NULL
;
7175 tree types
= NULL_TREE
;
7176 tree others
= NULL_TREE
;
7178 bool gave_void_only_once_err
= false;
7180 arg_info
->had_vla_unspec
= current_scope
->had_vla_unspec
;
7182 /* The bindings in this scope must not get put into a block.
7183 We will take care of deleting the binding nodes. */
7184 current_scope
->bindings
= 0;
7186 /* This function is only called if there was *something* on the
7190 /* A parameter list consisting solely of 'void' indicates that the
7191 function takes no arguments. But if the 'void' is qualified
7192 (by 'const' or 'volatile'), or has a storage class specifier
7193 ('register'), then the behavior is undefined; issue an error.
7194 Typedefs for 'void' are OK (see DR#157). */
7195 if (b
->prev
== 0 /* one binding */
7196 && TREE_CODE (b
->decl
) == PARM_DECL
/* which is a parameter */
7197 && !DECL_NAME (b
->decl
) /* anonymous */
7198 && VOID_TYPE_P (TREE_TYPE (b
->decl
))) /* of void type */
7200 if (TYPE_QUALS (TREE_TYPE (b
->decl
)) != TYPE_UNQUALIFIED
7201 || C_DECL_REGISTER (b
->decl
))
7202 error_at (b
->locus
, "%<void%> as only parameter may not be qualified");
7204 /* There cannot be an ellipsis. */
7206 error_at (b
->locus
, "%<void%> must be the only parameter");
7208 arg_info
->types
= void_list_node
;
7213 types
= void_list_node
;
7215 /* Break up the bindings list into parms, tags, types, and others;
7216 apply sanity checks; purge the name-to-decl bindings. */
7219 tree decl
= b
->decl
;
7220 tree type
= TREE_TYPE (decl
);
7222 const char *keyword
;
7224 switch (TREE_CODE (decl
))
7229 gcc_assert (I_SYMBOL_BINDING (b
->id
) == b
);
7230 I_SYMBOL_BINDING (b
->id
) = b
->shadowed
;
7233 /* Check for forward decls that never got their actual decl. */
7234 if (TREE_ASM_WRITTEN (decl
))
7236 "parameter %q+D has just a forward declaration", decl
);
7237 /* Check for (..., void, ...) and issue an error. */
7238 else if (VOID_TYPE_P (type
) && !DECL_NAME (decl
))
7240 if (!gave_void_only_once_err
)
7242 error_at (b
->locus
, "%<void%> must be the only parameter");
7243 gave_void_only_once_err
= true;
7248 /* Valid parameter, add it to the list. */
7249 DECL_CHAIN (decl
) = parms
;
7252 /* Since there is a prototype, args are passed in their
7253 declared types. The back end may override this later. */
7254 DECL_ARG_TYPE (decl
) = type
;
7255 types
= tree_cons (0, type
, types
);
7259 case ENUMERAL_TYPE
: keyword
= "enum"; goto tag
;
7260 case UNION_TYPE
: keyword
= "union"; goto tag
;
7261 case RECORD_TYPE
: keyword
= "struct"; goto tag
;
7263 /* Types may not have tag-names, in which case the type
7264 appears in the bindings list with b->id NULL. */
7267 gcc_assert (I_TAG_BINDING (b
->id
) == b
);
7268 I_TAG_BINDING (b
->id
) = b
->shadowed
;
7271 /* Warn about any struct, union or enum tags defined in a
7272 parameter list. The scope of such types is limited to
7273 the parameter list, which is rarely if ever desirable
7274 (it's impossible to call such a function with type-
7275 correct arguments). An anonymous union parm type is
7276 meaningful as a GNU extension, so don't warn for that. */
7277 if (TREE_CODE (decl
) != UNION_TYPE
|| b
->id
!= NULL_TREE
)
7280 /* The %s will be one of 'struct', 'union', or 'enum'. */
7281 warning_at (b
->locus
, 0,
7282 "%<%s %E%> declared inside parameter list"
7283 " will not be visible outside of this definition or"
7284 " declaration", keyword
, b
->id
);
7286 /* The %s will be one of 'struct', 'union', or 'enum'. */
7287 warning_at (b
->locus
, 0,
7288 "anonymous %s declared inside parameter list"
7289 " will not be visible outside of this definition or"
7290 " declaration", keyword
);
7295 vec_safe_push (tags
, tag
);
7299 /* FUNCTION_DECLs appear when there is an implicit function
7300 declaration in the parameter list. */
7301 gcc_assert (b
->nested
|| seen_error ());
7306 /* CONST_DECLs appear here when we have an embedded enum,
7307 and TYPE_DECLs appear here when we have an embedded struct
7308 or union. No warnings for this - we already warned about the
7311 /* When we reinsert this decl in the function body, we need
7312 to reconstruct whether it was marked as nested. */
7313 gcc_assert (!b
->nested
);
7314 DECL_CHAIN (decl
) = others
;
7320 /* error_mark_node appears here when we have an undeclared
7321 variable. Just throw it away. */
7324 gcc_assert (I_SYMBOL_BINDING (b
->id
) == b
);
7325 I_SYMBOL_BINDING (b
->id
) = b
->shadowed
;
7329 /* Other things that might be encountered. */
7336 b
= free_binding_and_advance (b
);
7339 arg_info
->parms
= parms
;
7340 arg_info
->tags
= tags
;
7341 arg_info
->types
= types
;
7342 arg_info
->others
= others
;
7343 arg_info
->pending_sizes
= expr
;
7347 /* Get the struct, enum or union (CODE says which) with tag NAME.
7348 Define the tag as a forward-reference with location LOC if it is
7349 not defined. Return a c_typespec structure for the type
7353 parser_xref_tag (location_t loc
, enum tree_code code
, tree name
)
7355 struct c_typespec ret
;
7359 ret
.expr
= NULL_TREE
;
7360 ret
.expr_const_operands
= true;
7362 /* If a cross reference is requested, look up the type
7363 already defined for this tag and return it. */
7365 ref
= lookup_tag (code
, name
, false, &refloc
);
7366 /* If this is the right type of tag, return what we found.
7367 (This reference will be shadowed by shadow_tag later if appropriate.)
7368 If this is the wrong type of tag, do not return it. If it was the
7369 wrong type in the same scope, we will have had an error
7370 message already; if in a different scope and declaring
7371 a name, pending_xref_error will give an error message; but if in a
7372 different scope and not declaring a name, this tag should
7373 shadow the previous declaration of a different type of tag, and
7374 this would not work properly if we return the reference found.
7375 (For example, with "struct foo" in an outer scope, "union foo;"
7376 must shadow that tag with a new one of union type.) */
7377 ret
.kind
= (ref
? ctsk_tagref
: ctsk_tagfirstref
);
7378 if (ref
&& TREE_CODE (ref
) == code
)
7380 if (C_TYPE_DEFINED_IN_STRUCT (ref
)
7381 && loc
!= UNKNOWN_LOCATION
7387 warning_at (loc
, OPT_Wc___compat
,
7388 ("enum type defined in struct or union "
7389 "is not visible in C++"));
7390 inform (refloc
, "enum type defined here");
7393 warning_at (loc
, OPT_Wc___compat
,
7394 ("struct defined in struct or union "
7395 "is not visible in C++"));
7396 inform (refloc
, "struct defined here");
7399 warning_at (loc
, OPT_Wc___compat
,
7400 ("union defined in struct or union "
7401 "is not visible in C++"));
7402 inform (refloc
, "union defined here");
7413 /* If no such tag is yet defined, create a forward-reference node
7414 and record it as the "definition".
7415 When a real declaration of this type is found,
7416 the forward-reference will be altered into a real type. */
7418 ref
= make_node (code
);
7419 if (code
== ENUMERAL_TYPE
)
7421 /* Give the type a default layout like unsigned int
7422 to avoid crashing if it does not get defined. */
7423 SET_TYPE_MODE (ref
, TYPE_MODE (unsigned_type_node
));
7424 SET_TYPE_ALIGN (ref
, TYPE_ALIGN (unsigned_type_node
));
7425 TYPE_USER_ALIGN (ref
) = 0;
7426 TYPE_UNSIGNED (ref
) = 1;
7427 TYPE_PRECISION (ref
) = TYPE_PRECISION (unsigned_type_node
);
7428 TYPE_MIN_VALUE (ref
) = TYPE_MIN_VALUE (unsigned_type_node
);
7429 TYPE_MAX_VALUE (ref
) = TYPE_MAX_VALUE (unsigned_type_node
);
7432 pushtag (loc
, name
, ref
);
7438 /* Get the struct, enum or union (CODE says which) with tag NAME.
7439 Define the tag as a forward-reference if it is not defined.
7440 Return a tree for the type. */
7443 xref_tag (enum tree_code code
, tree name
)
7445 return parser_xref_tag (input_location
, code
, name
).spec
;
7448 /* Make sure that the tag NAME is defined *in the current scope*
7449 at least as a forward reference.
7450 LOC is the location of the struct's definition.
7451 CODE says which kind of tag NAME ought to be.
7453 This stores the current value of the file static STRUCT_PARSE_INFO
7454 in *ENCLOSING_STRUCT_PARSE_INFO, and points STRUCT_PARSE_INFO at a
7455 new c_struct_parse_info structure. The old value of
7456 STRUCT_PARSE_INFO is restored in finish_struct. */
7459 start_struct (location_t loc
, enum tree_code code
, tree name
,
7460 struct c_struct_parse_info
**enclosing_struct_parse_info
)
7462 /* If there is already a tag defined at this scope
7463 (as a forward reference), just return it. */
7465 tree ref
= NULL_TREE
;
7466 location_t refloc
= UNKNOWN_LOCATION
;
7468 if (name
!= NULL_TREE
)
7469 ref
= lookup_tag (code
, name
, true, &refloc
);
7470 if (ref
&& TREE_CODE (ref
) == code
)
7472 if (TYPE_STUB_DECL (ref
))
7473 refloc
= DECL_SOURCE_LOCATION (TYPE_STUB_DECL (ref
));
7475 if (TYPE_SIZE (ref
))
7477 if (code
== UNION_TYPE
)
7478 error_at (loc
, "redefinition of %<union %E%>", name
);
7480 error_at (loc
, "redefinition of %<struct %E%>", name
);
7481 if (refloc
!= UNKNOWN_LOCATION
)
7482 inform (refloc
, "originally defined here");
7483 /* Don't create structures using a name already in use. */
7486 else if (C_TYPE_BEING_DEFINED (ref
))
7488 if (code
== UNION_TYPE
)
7489 error_at (loc
, "nested redefinition of %<union %E%>", name
);
7491 error_at (loc
, "nested redefinition of %<struct %E%>", name
);
7492 /* Don't bother to report "originally defined here" for a
7493 nested redefinition; the original definition should be
7495 /* Don't create structures that contain themselves. */
7500 /* Otherwise create a forward-reference just so the tag is in scope. */
7502 if (ref
== NULL_TREE
|| TREE_CODE (ref
) != code
)
7504 ref
= make_node (code
);
7505 pushtag (loc
, name
, ref
);
7508 C_TYPE_BEING_DEFINED (ref
) = 1;
7509 for (tree v
= TYPE_MAIN_VARIANT (ref
); v
; v
= TYPE_NEXT_VARIANT (v
))
7510 TYPE_PACKED (v
) = flag_pack_struct
;
7512 *enclosing_struct_parse_info
= struct_parse_info
;
7513 struct_parse_info
= new c_struct_parse_info ();
7515 /* FIXME: This will issue a warning for a use of a type defined
7516 within a statement expr used within sizeof, et. al. This is not
7517 terribly serious as C++ doesn't permit statement exprs within
7519 if (warn_cxx_compat
&& (in_sizeof
|| in_typeof
|| in_alignof
))
7520 warning_at (loc
, OPT_Wc___compat
,
7521 "defining type in %qs expression is invalid in C++",
7524 : (in_typeof
? "typeof" : "alignof")));
7529 /* Process the specs, declarator and width (NULL if omitted)
7530 of a structure component, returning a FIELD_DECL node.
7531 WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node.
7532 DECL_ATTRS is as for grokdeclarator.
7534 LOC is the location of the structure component.
7536 This is done during the parsing of the struct declaration.
7537 The FIELD_DECL nodes are chained together and the lot of them
7538 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
7541 grokfield (location_t loc
,
7542 struct c_declarator
*declarator
, struct c_declspecs
*declspecs
,
7543 tree width
, tree
*decl_attrs
)
7547 if (declarator
->kind
== cdk_id
&& declarator
->u
.id
== NULL_TREE
7548 && width
== NULL_TREE
)
7550 /* This is an unnamed decl.
7552 If we have something of the form "union { list } ;" then this
7553 is the anonymous union extension. Similarly for struct.
7555 If this is something of the form "struct foo;", then
7556 If MS or Plan 9 extensions are enabled, this is handled as
7557 an anonymous struct.
7558 Otherwise this is a forward declaration of a structure tag.
7560 If this is something of the form "foo;" and foo is a TYPE_DECL, then
7561 If foo names a structure or union without a tag, then this
7562 is an anonymous struct (this is permitted by C11).
7563 If MS or Plan 9 extensions are enabled and foo names a
7564 structure, then again this is an anonymous struct.
7565 Otherwise this is an error.
7567 Oh what a horrid tangled web we weave. I wonder if MS consciously
7568 took this from Plan 9 or if it was an accident of implementation
7569 that took root before someone noticed the bug... */
7571 tree type
= declspecs
->type
;
7574 if (RECORD_OR_UNION_TYPE_P (type
)
7575 && (flag_ms_extensions
7576 || flag_plan9_extensions
7577 || !declspecs
->typedef_p
))
7579 if (flag_ms_extensions
|| flag_plan9_extensions
)
7581 else if (TYPE_NAME (type
) == NULL
)
7588 pedwarn (loc
, 0, "declaration does not declare anything");
7592 pedwarn_c99 (loc
, OPT_Wpedantic
,
7593 "ISO C99 doesn%'t support unnamed structs/unions");
7595 pedwarn_c99 (loc
, OPT_Wpedantic
,
7596 "ISO C90 doesn%'t support unnamed structs/unions");
7599 value
= grokdeclarator (declarator
, declspecs
, FIELD
, false,
7600 width
? &width
: NULL
, decl_attrs
, NULL
, NULL
,
7603 finish_decl (value
, loc
, NULL_TREE
, NULL_TREE
, NULL_TREE
);
7604 DECL_INITIAL (value
) = width
;
7606 if (warn_cxx_compat
&& DECL_NAME (value
) != NULL_TREE
)
7608 /* If we currently have a binding for this field, set the
7609 in_struct field in the binding, so that we warn about lookups
7611 struct c_binding
*b
= I_SYMBOL_BINDING (DECL_NAME (value
));
7614 /* If the in_struct field is not yet set, push it on a list
7615 to be cleared when this struct is finished. */
7618 struct_parse_info
->fields
.safe_push (b
);
7627 /* Subroutine of detect_field_duplicates: return whether X and Y,
7628 which are both fields in the same struct, have duplicate field
7632 is_duplicate_field (tree x
, tree y
)
7634 if (DECL_NAME (x
) != NULL_TREE
&& DECL_NAME (x
) == DECL_NAME (y
))
7637 /* When using -fplan9-extensions, an anonymous field whose name is a
7638 typedef can duplicate a field name. */
7639 if (flag_plan9_extensions
7640 && (DECL_NAME (x
) == NULL_TREE
|| DECL_NAME (y
) == NULL_TREE
))
7642 tree xt
, xn
, yt
, yn
;
7645 if (DECL_NAME (x
) != NULL_TREE
)
7647 else if (RECORD_OR_UNION_TYPE_P (xt
)
7648 && TYPE_NAME (xt
) != NULL_TREE
7649 && TREE_CODE (TYPE_NAME (xt
)) == TYPE_DECL
)
7650 xn
= DECL_NAME (TYPE_NAME (xt
));
7655 if (DECL_NAME (y
) != NULL_TREE
)
7657 else if (RECORD_OR_UNION_TYPE_P (yt
)
7658 && TYPE_NAME (yt
) != NULL_TREE
7659 && TREE_CODE (TYPE_NAME (yt
)) == TYPE_DECL
)
7660 yn
= DECL_NAME (TYPE_NAME (yt
));
7664 if (xn
!= NULL_TREE
&& xn
== yn
)
7671 /* Subroutine of detect_field_duplicates: add the fields of FIELDLIST
7672 to HTAB, giving errors for any duplicates. */
7675 detect_field_duplicates_hash (tree fieldlist
,
7676 hash_table
<nofree_ptr_hash
<tree_node
> > *htab
)
7681 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
7682 if ((y
= DECL_NAME (x
)) != NULL_TREE
)
7684 slot
= htab
->find_slot (y
, INSERT
);
7687 error ("duplicate member %q+D", x
);
7688 DECL_NAME (x
) = NULL_TREE
;
7692 else if (RECORD_OR_UNION_TYPE_P (TREE_TYPE (x
)))
7694 detect_field_duplicates_hash (TYPE_FIELDS (TREE_TYPE (x
)), htab
);
7696 /* When using -fplan9-extensions, an anonymous field whose
7697 name is a typedef can duplicate a field name. */
7698 if (flag_plan9_extensions
7699 && TYPE_NAME (TREE_TYPE (x
)) != NULL_TREE
7700 && TREE_CODE (TYPE_NAME (TREE_TYPE (x
))) == TYPE_DECL
)
7702 tree xn
= DECL_NAME (TYPE_NAME (TREE_TYPE (x
)));
7703 slot
= htab
->find_slot (xn
, INSERT
);
7705 error ("duplicate member %q+D", TYPE_NAME (TREE_TYPE (x
)));
7711 /* Generate an error for any duplicate field names in FIELDLIST. Munge
7712 the list such that this does not present a problem later. */
7715 detect_field_duplicates (tree fieldlist
)
7720 /* If the struct is the list of instance variables of an Objective-C
7721 class, then we need to check all the instance variables of
7722 superclasses when checking for duplicates (since you can't have
7723 an instance variable in a subclass with the same name as an
7724 instance variable in a superclass). We pass on this job to the
7725 Objective-C compiler. objc_detect_field_duplicates() will return
7726 false if we are not checking the list of instance variables and
7727 the C frontend should proceed with the standard field duplicate
7728 checks. If we are checking the list of instance variables, the
7729 ObjC frontend will do the check, emit the errors if needed, and
7730 then return true. */
7731 if (c_dialect_objc ())
7732 if (objc_detect_field_duplicates (false))
7735 /* First, see if there are more than "a few" fields.
7736 This is trivially true if there are zero or one fields. */
7737 if (!fieldlist
|| !DECL_CHAIN (fieldlist
))
7742 if (DECL_NAME (x
) == NULL_TREE
7743 && RECORD_OR_UNION_TYPE_P (TREE_TYPE (x
)))
7746 } while (timeout
> 0 && x
);
7748 /* If there were "few" fields and no anonymous structures or unions,
7749 avoid the overhead of allocating a hash table. Instead just do
7750 the nested traversal thing. */
7753 for (x
= DECL_CHAIN (fieldlist
); x
; x
= DECL_CHAIN (x
))
7754 /* When using -fplan9-extensions, we can have duplicates
7755 between typedef names and fields. */
7757 || (flag_plan9_extensions
7758 && DECL_NAME (x
) == NULL_TREE
7759 && RECORD_OR_UNION_TYPE_P (TREE_TYPE (x
))
7760 && TYPE_NAME (TREE_TYPE (x
)) != NULL_TREE
7761 && TREE_CODE (TYPE_NAME (TREE_TYPE (x
))) == TYPE_DECL
))
7763 for (y
= fieldlist
; y
!= x
; y
= TREE_CHAIN (y
))
7764 if (is_duplicate_field (y
, x
))
7766 error ("duplicate member %q+D", x
);
7767 DECL_NAME (x
) = NULL_TREE
;
7773 hash_table
<nofree_ptr_hash
<tree_node
> > htab (37);
7774 detect_field_duplicates_hash (fieldlist
, &htab
);
7778 /* Finish up struct info used by -Wc++-compat. */
7781 warn_cxx_compat_finish_struct (tree fieldlist
, enum tree_code code
,
7782 location_t record_loc
)
7786 struct c_binding
*b
;
7788 if (fieldlist
== NULL_TREE
)
7790 if (code
== RECORD_TYPE
)
7791 warning_at (record_loc
, OPT_Wc___compat
,
7792 "empty struct has size 0 in C, size 1 in C++");
7794 warning_at (record_loc
, OPT_Wc___compat
,
7795 "empty union has size 0 in C, size 1 in C++");
7798 /* Set the C_TYPE_DEFINED_IN_STRUCT flag for each type defined in
7799 the current struct. We do this now at the end of the struct
7800 because the flag is used to issue visibility warnings, and we
7801 only want to issue those warnings if the type is referenced
7802 outside of the struct declaration. */
7803 FOR_EACH_VEC_ELT (struct_parse_info
->struct_types
, ix
, x
)
7804 C_TYPE_DEFINED_IN_STRUCT (x
) = 1;
7806 /* The TYPEDEFS_SEEN field of STRUCT_PARSE_INFO is a list of
7807 typedefs used when declaring fields in this struct. If the name
7808 of any of the fields is also a typedef name then the struct would
7809 not parse in C++, because the C++ lookup rules say that the
7810 typedef name would be looked up in the context of the struct, and
7811 would thus be the field rather than the typedef. */
7812 if (!struct_parse_info
->typedefs_seen
.is_empty ()
7813 && fieldlist
!= NULL_TREE
)
7815 /* Use a hash_set<tree> using the name of the typedef. We can use
7816 a hash_set<tree> because identifiers are interned. */
7817 hash_set
<tree
> tset
;
7819 FOR_EACH_VEC_ELT (struct_parse_info
->typedefs_seen
, ix
, x
)
7820 tset
.add (DECL_NAME (x
));
7822 for (x
= fieldlist
; x
!= NULL_TREE
; x
= DECL_CHAIN (x
))
7824 if (DECL_NAME (x
) != NULL_TREE
7825 && tset
.contains (DECL_NAME (x
)))
7827 warning_at (DECL_SOURCE_LOCATION (x
), OPT_Wc___compat
,
7828 ("using %qD as both field and typedef name is "
7831 /* FIXME: It would be nice to report the location where
7832 the typedef name is used. */
7837 /* For each field which has a binding and which was not defined in
7838 an enclosing struct, clear the in_struct field. */
7839 FOR_EACH_VEC_ELT (struct_parse_info
->fields
, ix
, b
)
7843 /* Function to help qsort sort FIELD_DECLs by name order. */
7846 field_decl_cmp (const void *x_p
, const void *y_p
)
7848 const tree
*const x
= (const tree
*) x_p
;
7849 const tree
*const y
= (const tree
*) y_p
;
7851 if (DECL_NAME (*x
) == DECL_NAME (*y
))
7852 /* A nontype is "greater" than a type. */
7853 return (TREE_CODE (*y
) == TYPE_DECL
) - (TREE_CODE (*x
) == TYPE_DECL
);
7854 if (DECL_NAME (*x
) == NULL_TREE
)
7856 if (DECL_NAME (*y
) == NULL_TREE
)
7858 if (DECL_NAME (*x
) < DECL_NAME (*y
))
7863 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
7864 LOC is the location of the RECORD_TYPE or UNION_TYPE's definition.
7865 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
7866 ATTRIBUTES are attributes to be applied to the structure.
7868 ENCLOSING_STRUCT_PARSE_INFO is the value of STRUCT_PARSE_INFO when
7869 the struct was started. */
7872 finish_struct (location_t loc
, tree t
, tree fieldlist
, tree attributes
,
7873 struct c_struct_parse_info
*enclosing_struct_parse_info
)
7876 bool toplevel
= file_scope
== current_scope
;
7878 /* If this type was previously laid out as a forward reference,
7879 make sure we lay it out again. */
7881 TYPE_SIZE (t
) = NULL_TREE
;
7883 decl_attributes (&t
, attributes
, (int) ATTR_FLAG_TYPE_IN_PLACE
);
7887 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
7889 if (DECL_NAME (x
) != NULL_TREE
)
7891 if (flag_isoc11
&& RECORD_OR_UNION_TYPE_P (TREE_TYPE (x
)))
7897 if (TREE_CODE (t
) == UNION_TYPE
)
7900 pedwarn (loc
, OPT_Wpedantic
, "union has no named members");
7902 pedwarn (loc
, OPT_Wpedantic
, "union has no members");
7907 pedwarn (loc
, OPT_Wpedantic
, "struct has no named members");
7909 pedwarn (loc
, OPT_Wpedantic
, "struct has no members");
7914 /* Install struct as DECL_CONTEXT of each field decl.
7915 Also process specified field sizes, found in the DECL_INITIAL,
7916 storing 0 there after the type has been changed to precision equal
7917 to its width, rather than the precision of the specified standard
7918 type. (Correct layout requires the original type to have been preserved
7921 bool saw_named_field
= false;
7922 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
7924 if (TREE_TYPE (x
) == error_mark_node
)
7927 DECL_CONTEXT (x
) = t
;
7929 /* If any field is const, the structure type is pseudo-const. */
7930 if (TREE_READONLY (x
))
7931 C_TYPE_FIELDS_READONLY (t
) = 1;
7934 /* A field that is pseudo-const makes the structure likewise. */
7935 tree t1
= strip_array_types (TREE_TYPE (x
));
7936 if (RECORD_OR_UNION_TYPE_P (t1
) && C_TYPE_FIELDS_READONLY (t1
))
7937 C_TYPE_FIELDS_READONLY (t
) = 1;
7940 /* Any field that is volatile means variables of this type must be
7941 treated in some ways as volatile. */
7942 if (TREE_THIS_VOLATILE (x
))
7943 C_TYPE_FIELDS_VOLATILE (t
) = 1;
7945 /* Any field of nominal variable size implies structure is too. */
7946 if (C_DECL_VARIABLE_SIZE (x
))
7947 C_TYPE_VARIABLE_SIZE (t
) = 1;
7949 if (DECL_INITIAL (x
))
7951 unsigned HOST_WIDE_INT width
= tree_to_uhwi (DECL_INITIAL (x
));
7952 DECL_SIZE (x
) = bitsize_int (width
);
7953 DECL_BIT_FIELD (x
) = 1;
7954 SET_DECL_C_BIT_FIELD (x
);
7958 && (DECL_BIT_FIELD (x
)
7959 || TYPE_ALIGN (TREE_TYPE (x
)) > BITS_PER_UNIT
))
7960 DECL_PACKED (x
) = 1;
7962 /* Detect flexible array member in an invalid context. */
7963 if (TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
7964 && TYPE_SIZE (TREE_TYPE (x
)) == NULL_TREE
7965 && TYPE_DOMAIN (TREE_TYPE (x
)) != NULL_TREE
7966 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x
))) == NULL_TREE
)
7968 if (TREE_CODE (t
) == UNION_TYPE
)
7970 error_at (DECL_SOURCE_LOCATION (x
),
7971 "flexible array member in union");
7972 TREE_TYPE (x
) = error_mark_node
;
7974 else if (DECL_CHAIN (x
) != NULL_TREE
)
7976 error_at (DECL_SOURCE_LOCATION (x
),
7977 "flexible array member not at end of struct");
7978 TREE_TYPE (x
) = error_mark_node
;
7980 else if (!saw_named_field
)
7982 error_at (DECL_SOURCE_LOCATION (x
),
7983 "flexible array member in a struct with no named "
7985 TREE_TYPE (x
) = error_mark_node
;
7989 if (pedantic
&& TREE_CODE (t
) == RECORD_TYPE
7990 && flexible_array_type_p (TREE_TYPE (x
)))
7991 pedwarn (DECL_SOURCE_LOCATION (x
), OPT_Wpedantic
,
7992 "invalid use of structure with flexible array member");
7995 || RECORD_OR_UNION_TYPE_P (TREE_TYPE (x
)))
7996 saw_named_field
= true;
7999 detect_field_duplicates (fieldlist
);
8001 /* Now we have the nearly final fieldlist. Record it,
8002 then lay out the structure or union (including the fields). */
8004 TYPE_FIELDS (t
) = fieldlist
;
8006 maybe_apply_pragma_scalar_storage_order (t
);
8010 if (TYPE_SIZE_UNIT (t
)
8011 && TREE_CODE (TYPE_SIZE_UNIT (t
)) == INTEGER_CST
8012 && !TREE_OVERFLOW (TYPE_SIZE_UNIT (t
))
8013 && !valid_constant_size_p (TYPE_SIZE_UNIT (t
)))
8014 error ("type %qT is too large", t
);
8016 /* Give bit-fields their proper types and rewrite the type of array fields
8017 with scalar component if the enclosing type has reverse storage order. */
8018 for (tree field
= fieldlist
; field
; field
= DECL_CHAIN (field
))
8020 if (TREE_CODE (field
) == FIELD_DECL
8021 && DECL_INITIAL (field
)
8022 && TREE_TYPE (field
) != error_mark_node
)
8024 unsigned HOST_WIDE_INT width
8025 = tree_to_uhwi (DECL_INITIAL (field
));
8026 tree type
= TREE_TYPE (field
);
8027 if (width
!= TYPE_PRECISION (type
))
8030 = c_build_bitfield_integer_type (width
, TYPE_UNSIGNED (type
));
8031 SET_DECL_MODE (field
, TYPE_MODE (TREE_TYPE (field
)));
8033 DECL_INITIAL (field
) = NULL_TREE
;
8035 else if (TYPE_REVERSE_STORAGE_ORDER (t
)
8036 && TREE_CODE (field
) == FIELD_DECL
8037 && TREE_CODE (TREE_TYPE (field
)) == ARRAY_TYPE
)
8039 tree ftype
= TREE_TYPE (field
);
8040 tree ctype
= strip_array_types (ftype
);
8041 if (!RECORD_OR_UNION_TYPE_P (ctype
) && TYPE_MODE (ctype
) != QImode
)
8043 tree fmain_type
= TYPE_MAIN_VARIANT (ftype
);
8044 tree
*typep
= &fmain_type
;
8046 *typep
= build_distinct_type_copy (*typep
);
8047 TYPE_REVERSE_STORAGE_ORDER (*typep
) = 1;
8048 typep
= &TREE_TYPE (*typep
);
8049 } while (TREE_CODE (*typep
) == ARRAY_TYPE
);
8051 = c_build_qualified_type (fmain_type
, TYPE_QUALS (ftype
));
8056 /* Now we have the truly final field list.
8057 Store it in this type and in the variants. */
8059 TYPE_FIELDS (t
) = fieldlist
;
8061 /* If there are lots of fields, sort so we can look through them fast.
8062 We arbitrarily consider 16 or more elts to be "a lot". */
8067 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
8069 if (len
> 15 || DECL_NAME (x
) == NULL
)
8077 struct lang_type
*space
;
8078 struct sorted_fields_type
*space2
;
8080 len
+= list_length (x
);
8082 /* Use the same allocation policy here that make_node uses, to
8083 ensure that this lives as long as the rest of the struct decl.
8084 All decls in an inline function need to be saved. */
8086 space
= ggc_cleared_alloc
<struct lang_type
> ();
8087 space2
= (sorted_fields_type
*) ggc_internal_alloc
8088 (sizeof (struct sorted_fields_type
) + len
* sizeof (tree
));
8092 field_array
= &space2
->elts
[0];
8093 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
8095 field_array
[len
++] = x
;
8097 /* If there is anonymous struct or union, break out of the loop. */
8098 if (DECL_NAME (x
) == NULL
)
8101 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
8104 TYPE_LANG_SPECIFIC (t
) = space
;
8105 TYPE_LANG_SPECIFIC (t
)->s
->len
= len
;
8106 field_array
= TYPE_LANG_SPECIFIC (t
)->s
->elts
;
8107 qsort (field_array
, len
, sizeof (tree
), field_decl_cmp
);
8112 /* Note: C_TYPE_INCOMPLETE_VARS overloads TYPE_VFIELD which is used
8113 in dwarf2out via rest_of_decl_compilation below and means
8114 something totally different. Since we will be clearing
8115 C_TYPE_INCOMPLETE_VARS shortly after we iterate through them,
8116 clear it ahead of time and avoid problems in dwarf2out. Ideally,
8117 C_TYPE_INCOMPLETE_VARS should use some language specific
8119 tree incomplete_vars
= C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t
));
8120 for (x
= TYPE_MAIN_VARIANT (t
); x
; x
= TYPE_NEXT_VARIANT (x
))
8122 TYPE_FIELDS (x
) = TYPE_FIELDS (t
);
8123 TYPE_LANG_SPECIFIC (x
) = TYPE_LANG_SPECIFIC (t
);
8124 C_TYPE_FIELDS_READONLY (x
) = C_TYPE_FIELDS_READONLY (t
);
8125 C_TYPE_FIELDS_VOLATILE (x
) = C_TYPE_FIELDS_VOLATILE (t
);
8126 C_TYPE_VARIABLE_SIZE (x
) = C_TYPE_VARIABLE_SIZE (t
);
8127 C_TYPE_INCOMPLETE_VARS (x
) = NULL_TREE
;
8130 /* If this was supposed to be a transparent union, but we can't
8131 make it one, warn and turn off the flag. */
8132 if (TREE_CODE (t
) == UNION_TYPE
8133 && TYPE_TRANSPARENT_AGGR (t
)
8134 && (!TYPE_FIELDS (t
) || TYPE_MODE (t
) != DECL_MODE (TYPE_FIELDS (t
))))
8136 TYPE_TRANSPARENT_AGGR (t
) = 0;
8137 warning_at (loc
, 0, "union cannot be made transparent");
8140 /* If this structure or union completes the type of any previous
8141 variable declaration, lay it out and output its rtl. */
8142 for (x
= incomplete_vars
; x
; x
= TREE_CHAIN (x
))
8144 tree decl
= TREE_VALUE (x
);
8145 if (TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
)
8146 layout_array_type (TREE_TYPE (decl
));
8147 if (TREE_CODE (decl
) != TYPE_DECL
)
8149 layout_decl (decl
, 0);
8150 if (c_dialect_objc ())
8151 objc_check_decl (decl
);
8152 rest_of_decl_compilation (decl
, toplevel
, 0);
8156 /* Update type location to the one of the definition, instead of e.g.
8157 a forward declaration. */
8158 if (TYPE_STUB_DECL (t
))
8159 DECL_SOURCE_LOCATION (TYPE_STUB_DECL (t
)) = loc
;
8161 /* Finish debugging output for this type. */
8162 rest_of_type_compilation (t
, toplevel
);
8164 /* If we're inside a function proper, i.e. not file-scope and not still
8165 parsing parameters, then arrange for the size of a variable sized type
8167 if (building_stmt_list_p () && variably_modified_type_p (t
, NULL_TREE
))
8168 add_stmt (build_stmt (loc
,
8169 DECL_EXPR
, build_decl (loc
, TYPE_DECL
, NULL
, t
)));
8171 if (warn_cxx_compat
)
8172 warn_cxx_compat_finish_struct (fieldlist
, TREE_CODE (t
), loc
);
8174 delete struct_parse_info
;
8176 struct_parse_info
= enclosing_struct_parse_info
;
8178 /* If this struct is defined inside a struct, add it to
8181 && struct_parse_info
!= NULL
8182 && !in_sizeof
&& !in_typeof
&& !in_alignof
)
8183 struct_parse_info
->struct_types
.safe_push (t
);
8189 gt_pointer_operator new_value
;
8193 /* This routine compares two fields like field_decl_cmp but using the
8194 pointer operator in resort_data. */
8197 resort_field_decl_cmp (const void *x_p
, const void *y_p
)
8199 const tree
*const x
= (const tree
*) x_p
;
8200 const tree
*const y
= (const tree
*) y_p
;
8202 if (DECL_NAME (*x
) == DECL_NAME (*y
))
8203 /* A nontype is "greater" than a type. */
8204 return (TREE_CODE (*y
) == TYPE_DECL
) - (TREE_CODE (*x
) == TYPE_DECL
);
8205 if (DECL_NAME (*x
) == NULL_TREE
)
8207 if (DECL_NAME (*y
) == NULL_TREE
)
8210 tree d1
= DECL_NAME (*x
);
8211 tree d2
= DECL_NAME (*y
);
8212 resort_data
.new_value (&d1
, resort_data
.cookie
);
8213 resort_data
.new_value (&d2
, resort_data
.cookie
);
8220 /* Resort DECL_SORTED_FIELDS because pointers have been reordered. */
8223 resort_sorted_fields (void *obj
,
8224 void * ARG_UNUSED (orig_obj
),
8225 gt_pointer_operator new_value
,
8228 struct sorted_fields_type
*sf
= (struct sorted_fields_type
*) obj
;
8229 resort_data
.new_value
= new_value
;
8230 resort_data
.cookie
= cookie
;
8231 qsort (&sf
->elts
[0], sf
->len
, sizeof (tree
),
8232 resort_field_decl_cmp
);
8235 /* Lay out the type T, and its element type, and so on. */
8238 layout_array_type (tree t
)
8240 if (TREE_CODE (TREE_TYPE (t
)) == ARRAY_TYPE
)
8241 layout_array_type (TREE_TYPE (t
));
8245 /* Begin compiling the definition of an enumeration type.
8246 NAME is its name (or null if anonymous).
8247 LOC is the enum's location.
8248 Returns the type object, as yet incomplete.
8249 Also records info about it so that build_enumerator
8250 may be used to declare the individual values as they are read. */
8253 start_enum (location_t loc
, struct c_enum_contents
*the_enum
, tree name
)
8255 tree enumtype
= NULL_TREE
;
8256 location_t enumloc
= UNKNOWN_LOCATION
;
8258 /* If this is the real definition for a previous forward reference,
8259 fill in the contents in the same object that used to be the
8260 forward reference. */
8262 if (name
!= NULL_TREE
)
8263 enumtype
= lookup_tag (ENUMERAL_TYPE
, name
, true, &enumloc
);
8265 if (enumtype
== NULL_TREE
|| TREE_CODE (enumtype
) != ENUMERAL_TYPE
)
8267 enumtype
= make_node (ENUMERAL_TYPE
);
8268 pushtag (loc
, name
, enumtype
);
8270 /* Update type location to the one of the definition, instead of e.g.
8271 a forward declaration. */
8272 else if (TYPE_STUB_DECL (enumtype
))
8274 enumloc
= DECL_SOURCE_LOCATION (TYPE_STUB_DECL (enumtype
));
8275 DECL_SOURCE_LOCATION (TYPE_STUB_DECL (enumtype
)) = loc
;
8278 if (C_TYPE_BEING_DEFINED (enumtype
))
8279 error_at (loc
, "nested redefinition of %<enum %E%>", name
);
8281 C_TYPE_BEING_DEFINED (enumtype
) = 1;
8283 if (TYPE_VALUES (enumtype
) != NULL_TREE
)
8285 /* This enum is a named one that has been declared already. */
8286 error_at (loc
, "redeclaration of %<enum %E%>", name
);
8287 if (enumloc
!= UNKNOWN_LOCATION
)
8288 inform (enumloc
, "originally defined here");
8290 /* Completely replace its old definition.
8291 The old enumerators remain defined, however. */
8292 TYPE_VALUES (enumtype
) = NULL_TREE
;
8295 the_enum
->enum_next_value
= integer_zero_node
;
8296 the_enum
->enum_overflow
= 0;
8298 if (flag_short_enums
)
8299 for (tree v
= TYPE_MAIN_VARIANT (enumtype
); v
; v
= TYPE_NEXT_VARIANT (v
))
8300 TYPE_PACKED (v
) = 1;
8302 /* FIXME: This will issue a warning for a use of a type defined
8303 within sizeof in a statement expr. This is not terribly serious
8304 as C++ doesn't permit statement exprs within sizeof anyhow. */
8305 if (warn_cxx_compat
&& (in_sizeof
|| in_typeof
|| in_alignof
))
8306 warning_at (loc
, OPT_Wc___compat
,
8307 "defining type in %qs expression is invalid in C++",
8310 : (in_typeof
? "typeof" : "alignof")));
8315 /* After processing and defining all the values of an enumeration type,
8316 install their decls in the enumeration type and finish it off.
8317 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
8318 and ATTRIBUTES are the specified attributes.
8319 Returns ENUMTYPE. */
8322 finish_enum (tree enumtype
, tree values
, tree attributes
)
8325 tree minnode
= NULL_TREE
, maxnode
= NULL_TREE
;
8328 bool toplevel
= (file_scope
== current_scope
);
8329 struct lang_type
*lt
;
8331 decl_attributes (&enumtype
, attributes
, (int) ATTR_FLAG_TYPE_IN_PLACE
);
8333 /* Calculate the maximum value of any enumerator in this type. */
8335 if (values
== error_mark_node
)
8336 minnode
= maxnode
= integer_zero_node
;
8339 minnode
= maxnode
= TREE_VALUE (values
);
8340 for (pair
= TREE_CHAIN (values
); pair
; pair
= TREE_CHAIN (pair
))
8342 tree value
= TREE_VALUE (pair
);
8343 if (tree_int_cst_lt (maxnode
, value
))
8345 if (tree_int_cst_lt (value
, minnode
))
8350 /* Construct the final type of this enumeration. It is the same
8351 as one of the integral types - the narrowest one that fits, except
8352 that normally we only go as narrow as int - and signed iff any of
8353 the values are negative. */
8354 sign
= (tree_int_cst_sgn (minnode
) >= 0) ? UNSIGNED
: SIGNED
;
8355 precision
= MAX (tree_int_cst_min_precision (minnode
, sign
),
8356 tree_int_cst_min_precision (maxnode
, sign
));
8358 /* If the precision of the type was specified with an attribute and it
8359 was too small, give an error. Otherwise, use it. */
8360 if (TYPE_PRECISION (enumtype
) && lookup_attribute ("mode", attributes
))
8362 if (precision
> TYPE_PRECISION (enumtype
))
8364 TYPE_PRECISION (enumtype
) = 0;
8365 error ("specified mode too small for enumeral values");
8368 precision
= TYPE_PRECISION (enumtype
);
8371 TYPE_PRECISION (enumtype
) = 0;
8373 if (TYPE_PACKED (enumtype
)
8374 || precision
> TYPE_PRECISION (integer_type_node
)
8375 || TYPE_PRECISION (enumtype
))
8377 tem
= c_common_type_for_size (precision
, sign
== UNSIGNED
? 1 : 0);
8380 warning (0, "enumeration values exceed range of largest integer");
8381 tem
= long_long_integer_type_node
;
8385 tem
= sign
== UNSIGNED
? unsigned_type_node
: integer_type_node
;
8387 TYPE_MIN_VALUE (enumtype
) = TYPE_MIN_VALUE (tem
);
8388 TYPE_MAX_VALUE (enumtype
) = TYPE_MAX_VALUE (tem
);
8389 TYPE_UNSIGNED (enumtype
) = TYPE_UNSIGNED (tem
);
8390 SET_TYPE_ALIGN (enumtype
, TYPE_ALIGN (tem
));
8391 TYPE_SIZE (enumtype
) = NULL_TREE
;
8392 TYPE_PRECISION (enumtype
) = TYPE_PRECISION (tem
);
8394 layout_type (enumtype
);
8396 if (values
!= error_mark_node
)
8398 /* Change the type of the enumerators to be the enum type. We
8399 need to do this irrespective of the size of the enum, for
8400 proper type checking. Replace the DECL_INITIALs of the
8401 enumerators, and the value slots of the list, with copies
8402 that have the enum type; they cannot be modified in place
8403 because they may be shared (e.g. integer_zero_node) Finally,
8404 change the purpose slots to point to the names of the decls. */
8405 for (pair
= values
; pair
; pair
= TREE_CHAIN (pair
))
8407 tree enu
= TREE_PURPOSE (pair
);
8408 tree ini
= DECL_INITIAL (enu
);
8410 TREE_TYPE (enu
) = enumtype
;
8412 /* The ISO C Standard mandates enumerators to have type int,
8413 even though the underlying type of an enum type is
8414 unspecified. However, GCC allows enumerators of any
8415 integer type as an extensions. build_enumerator()
8416 converts any enumerators that fit in an int to type int,
8417 to avoid promotions to unsigned types when comparing
8418 integers with enumerators that fit in the int range.
8419 When -pedantic is given, build_enumerator() would have
8420 already warned about those that don't fit. Here we
8421 convert the rest to the enumerator type. */
8422 if (TREE_TYPE (ini
) != integer_type_node
)
8423 ini
= convert (enumtype
, ini
);
8425 DECL_INITIAL (enu
) = ini
;
8426 TREE_PURPOSE (pair
) = DECL_NAME (enu
);
8427 TREE_VALUE (pair
) = ini
;
8430 TYPE_VALUES (enumtype
) = values
;
8433 /* Record the min/max values so that we can warn about bit-field
8434 enumerations that are too small for the values. */
8435 lt
= ggc_cleared_alloc
<struct lang_type
> ();
8436 lt
->enum_min
= minnode
;
8437 lt
->enum_max
= maxnode
;
8438 TYPE_LANG_SPECIFIC (enumtype
) = lt
;
8440 /* Fix up all variant types of this enum type. */
8441 for (tem
= TYPE_MAIN_VARIANT (enumtype
); tem
; tem
= TYPE_NEXT_VARIANT (tem
))
8443 if (tem
== enumtype
)
8445 TYPE_VALUES (tem
) = TYPE_VALUES (enumtype
);
8446 TYPE_MIN_VALUE (tem
) = TYPE_MIN_VALUE (enumtype
);
8447 TYPE_MAX_VALUE (tem
) = TYPE_MAX_VALUE (enumtype
);
8448 TYPE_SIZE (tem
) = TYPE_SIZE (enumtype
);
8449 TYPE_SIZE_UNIT (tem
) = TYPE_SIZE_UNIT (enumtype
);
8450 SET_TYPE_MODE (tem
, TYPE_MODE (enumtype
));
8451 TYPE_PRECISION (tem
) = TYPE_PRECISION (enumtype
);
8452 SET_TYPE_ALIGN (tem
, TYPE_ALIGN (enumtype
));
8453 TYPE_USER_ALIGN (tem
) = TYPE_USER_ALIGN (enumtype
);
8454 TYPE_UNSIGNED (tem
) = TYPE_UNSIGNED (enumtype
);
8455 TYPE_LANG_SPECIFIC (tem
) = TYPE_LANG_SPECIFIC (enumtype
);
8458 /* Finish debugging output for this type. */
8459 rest_of_type_compilation (enumtype
, toplevel
);
8461 /* If this enum is defined inside a struct, add it to
8464 && struct_parse_info
!= NULL
8465 && !in_sizeof
&& !in_typeof
&& !in_alignof
)
8466 struct_parse_info
->struct_types
.safe_push (enumtype
);
8471 /* Build and install a CONST_DECL for one value of the
8472 current enumeration type (one that was begun with start_enum).
8473 DECL_LOC is the location of the enumerator.
8474 LOC is the location of the '=' operator if any, DECL_LOC otherwise.
8475 Return a tree-list containing the CONST_DECL and its value.
8476 Assignment of sequential values by default is handled here. */
8479 build_enumerator (location_t decl_loc
, location_t loc
,
8480 struct c_enum_contents
*the_enum
, tree name
, tree value
)
8484 /* Validate and default VALUE. */
8486 if (value
!= NULL_TREE
)
8488 /* Don't issue more errors for error_mark_node (i.e. an
8489 undeclared identifier) - just ignore the value expression. */
8490 if (value
== error_mark_node
)
8492 else if (!INTEGRAL_TYPE_P (TREE_TYPE (value
)))
8494 error_at (loc
, "enumerator value for %qE is not an integer constant",
8500 if (TREE_CODE (value
) != INTEGER_CST
)
8502 value
= c_fully_fold (value
, false, NULL
);
8503 if (TREE_CODE (value
) == INTEGER_CST
)
8504 pedwarn (loc
, OPT_Wpedantic
,
8505 "enumerator value for %qE is not an integer "
8506 "constant expression", name
);
8508 if (TREE_CODE (value
) != INTEGER_CST
)
8510 error ("enumerator value for %qE is not an integer constant",
8516 value
= default_conversion (value
);
8517 constant_expression_warning (value
);
8522 /* Default based on previous value. */
8523 /* It should no longer be possible to have NON_LVALUE_EXPR
8525 if (value
== NULL_TREE
)
8527 value
= the_enum
->enum_next_value
;
8528 if (the_enum
->enum_overflow
)
8529 error_at (loc
, "overflow in enumeration values");
8531 /* Even though the underlying type of an enum is unspecified, the
8532 type of enumeration constants is explicitly defined as int
8533 (6.4.4.3/2 in the C99 Standard). GCC allows any integer type as
8535 else if (!int_fits_type_p (value
, integer_type_node
))
8536 pedwarn (loc
, OPT_Wpedantic
,
8537 "ISO C restricts enumerator values to range of %<int%>");
8539 /* The ISO C Standard mandates enumerators to have type int, even
8540 though the underlying type of an enum type is unspecified.
8541 However, GCC allows enumerators of any integer type as an
8542 extensions. Here we convert any enumerators that fit in an int
8543 to type int, to avoid promotions to unsigned types when comparing
8544 integers with enumerators that fit in the int range. When
8545 -pedantic is given, we would have already warned about those that
8546 don't fit. We have to do this here rather than in finish_enum
8547 because this value may be used to define more enumerators. */
8548 if (int_fits_type_p (value
, integer_type_node
))
8549 value
= convert (integer_type_node
, value
);
8551 /* Set basis for default for next value. */
8552 the_enum
->enum_next_value
8553 = build_binary_op (EXPR_LOC_OR_LOC (value
, input_location
),
8554 PLUS_EXPR
, value
, integer_one_node
, false);
8555 the_enum
->enum_overflow
= tree_int_cst_lt (the_enum
->enum_next_value
, value
);
8557 /* Now create a declaration for the enum value name. */
8559 type
= TREE_TYPE (value
);
8560 type
= c_common_type_for_size (MAX (TYPE_PRECISION (type
),
8561 TYPE_PRECISION (integer_type_node
)),
8562 (TYPE_PRECISION (type
)
8563 >= TYPE_PRECISION (integer_type_node
)
8564 && TYPE_UNSIGNED (type
)));
8566 decl
= build_decl (decl_loc
, CONST_DECL
, name
, type
);
8567 DECL_INITIAL (decl
) = convert (type
, value
);
8570 return tree_cons (decl
, value
, NULL_TREE
);
8574 /* Create the FUNCTION_DECL for a function definition.
8575 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
8576 the declaration; they describe the function's name and the type it returns,
8577 but twisted together in a fashion that parallels the syntax of C.
8579 This function creates a binding context for the function body
8580 as well as setting up the FUNCTION_DECL in current_function_decl.
8582 Returns true on success. If the DECLARATOR is not suitable for a function
8583 (it defines a datum instead), we return false to report a parse error. */
8586 start_function (struct c_declspecs
*declspecs
, struct c_declarator
*declarator
,
8589 tree decl1
, old_decl
;
8590 tree restype
, resdecl
;
8593 current_function_returns_value
= 0; /* Assume, until we see it does. */
8594 current_function_returns_null
= 0;
8595 current_function_returns_abnormally
= 0;
8596 warn_about_return_type
= 0;
8597 c_switch_stack
= NULL
;
8599 /* Indicate no valid break/continue context by setting these variables
8600 to some non-null, non-label value. We'll notice and emit the proper
8601 error message in c_finish_bc_stmt. */
8602 c_break_label
= c_cont_label
= size_zero_node
;
8604 decl1
= grokdeclarator (declarator
, declspecs
, FUNCDEF
, true, NULL
,
8605 &attributes
, NULL
, NULL
, DEPRECATED_NORMAL
);
8606 invoke_plugin_callbacks (PLUGIN_START_PARSE_FUNCTION
, decl1
);
8608 /* If the declarator is not suitable for a function definition,
8609 cause a syntax error. */
8610 if (decl1
== NULL_TREE
8611 || TREE_CODE (decl1
) != FUNCTION_DECL
)
8614 loc
= DECL_SOURCE_LOCATION (decl1
);
8616 c_decl_attributes (&decl1
, attributes
, 0);
8618 if (DECL_DECLARED_INLINE_P (decl1
)
8619 && DECL_UNINLINABLE (decl1
)
8620 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1
)))
8621 warning_at (loc
, OPT_Wattributes
,
8622 "inline function %qD given attribute noinline",
8625 /* Handle gnu_inline attribute. */
8626 if (declspecs
->inline_p
8627 && !flag_gnu89_inline
8628 && TREE_CODE (decl1
) == FUNCTION_DECL
8629 && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl1
))
8630 || current_function_decl
))
8632 if (declspecs
->storage_class
!= csc_static
)
8633 DECL_EXTERNAL (decl1
) = !DECL_EXTERNAL (decl1
);
8636 announce_function (decl1
);
8638 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1
))))
8640 error_at (loc
, "return type is an incomplete type");
8641 /* Make it return void instead. */
8643 = build_function_type (void_type_node
,
8644 TYPE_ARG_TYPES (TREE_TYPE (decl1
)));
8647 if (warn_about_return_type
)
8648 warn_defaults_to (loc
, flag_isoc99
? OPT_Wimplicit_int
8649 : (warn_return_type
? OPT_Wreturn_type
8650 : OPT_Wimplicit_int
),
8651 "return type defaults to %<int%>");
8653 /* Make the init_value nonzero so pushdecl knows this is not tentative.
8654 error_mark_node is replaced below (in pop_scope) with the BLOCK. */
8655 DECL_INITIAL (decl1
) = error_mark_node
;
8657 /* A nested function is not global. */
8658 if (current_function_decl
!= NULL_TREE
)
8659 TREE_PUBLIC (decl1
) = 0;
8661 /* If this definition isn't a prototype and we had a prototype declaration
8662 before, copy the arg type info from that prototype. */
8663 old_decl
= lookup_name_in_scope (DECL_NAME (decl1
), current_scope
);
8664 if (old_decl
&& TREE_CODE (old_decl
) != FUNCTION_DECL
)
8665 old_decl
= NULL_TREE
;
8666 current_function_prototype_locus
= UNKNOWN_LOCATION
;
8667 current_function_prototype_built_in
= false;
8668 current_function_prototype_arg_types
= NULL_TREE
;
8669 if (!prototype_p (TREE_TYPE (decl1
)))
8671 if (old_decl
!= NULL_TREE
8672 && TREE_CODE (TREE_TYPE (old_decl
)) == FUNCTION_TYPE
8673 && comptypes (TREE_TYPE (TREE_TYPE (decl1
)),
8674 TREE_TYPE (TREE_TYPE (old_decl
))))
8676 if (stdarg_p (TREE_TYPE (old_decl
)))
8678 warning_at (loc
, 0, "%q+D defined as variadic function "
8679 "without prototype", decl1
);
8680 locate_old_decl (old_decl
);
8682 TREE_TYPE (decl1
) = composite_type (TREE_TYPE (old_decl
),
8684 current_function_prototype_locus
= DECL_SOURCE_LOCATION (old_decl
);
8685 current_function_prototype_built_in
8686 = C_DECL_BUILTIN_PROTOTYPE (old_decl
);
8687 current_function_prototype_arg_types
8688 = TYPE_ARG_TYPES (TREE_TYPE (decl1
));
8690 if (TREE_PUBLIC (decl1
))
8692 /* If there is an external prototype declaration of this
8693 function, record its location but do not copy information
8694 to this decl. This may be an invisible declaration
8695 (built-in or in a scope which has finished) or simply
8696 have more refined argument types than any declaration
8698 struct c_binding
*b
;
8699 for (b
= I_SYMBOL_BINDING (DECL_NAME (decl1
)); b
; b
= b
->shadowed
)
8700 if (B_IN_SCOPE (b
, external_scope
))
8704 tree ext_decl
, ext_type
;
8706 ext_type
= b
->u
.type
? b
->u
.type
: TREE_TYPE (ext_decl
);
8707 if (TREE_CODE (ext_type
) == FUNCTION_TYPE
8708 && comptypes (TREE_TYPE (TREE_TYPE (decl1
)),
8709 TREE_TYPE (ext_type
)))
8711 current_function_prototype_locus
8712 = DECL_SOURCE_LOCATION (ext_decl
);
8713 current_function_prototype_built_in
8714 = C_DECL_BUILTIN_PROTOTYPE (ext_decl
);
8715 current_function_prototype_arg_types
8716 = TYPE_ARG_TYPES (ext_type
);
8722 /* Optionally warn of old-fashioned def with no previous prototype. */
8723 if (warn_strict_prototypes
8724 && old_decl
!= error_mark_node
8725 && !prototype_p (TREE_TYPE (decl1
))
8726 && C_DECL_ISNT_PROTOTYPE (old_decl
))
8727 warning_at (loc
, OPT_Wstrict_prototypes
,
8728 "function declaration isn%'t a prototype");
8729 /* Optionally warn of any global def with no previous prototype. */
8730 else if (warn_missing_prototypes
8731 && old_decl
!= error_mark_node
8732 && TREE_PUBLIC (decl1
)
8733 && !MAIN_NAME_P (DECL_NAME (decl1
))
8734 && C_DECL_ISNT_PROTOTYPE (old_decl
)
8735 && !DECL_DECLARED_INLINE_P (decl1
))
8736 warning_at (loc
, OPT_Wmissing_prototypes
,
8737 "no previous prototype for %qD", decl1
);
8738 /* Optionally warn of any def with no previous prototype
8739 if the function has already been used. */
8740 else if (warn_missing_prototypes
8741 && old_decl
!= NULL_TREE
8742 && old_decl
!= error_mark_node
8743 && TREE_USED (old_decl
)
8744 && !prototype_p (TREE_TYPE (old_decl
)))
8745 warning_at (loc
, OPT_Wmissing_prototypes
,
8746 "%qD was used with no prototype before its definition", decl1
);
8747 /* Optionally warn of any global def with no previous declaration. */
8748 else if (warn_missing_declarations
8749 && TREE_PUBLIC (decl1
)
8750 && old_decl
== NULL_TREE
8751 && !MAIN_NAME_P (DECL_NAME (decl1
))
8752 && !DECL_DECLARED_INLINE_P (decl1
))
8753 warning_at (loc
, OPT_Wmissing_declarations
,
8754 "no previous declaration for %qD",
8756 /* Optionally warn of any def with no previous declaration
8757 if the function has already been used. */
8758 else if (warn_missing_declarations
8759 && old_decl
!= NULL_TREE
8760 && old_decl
!= error_mark_node
8761 && TREE_USED (old_decl
)
8762 && C_DECL_IMPLICIT (old_decl
))
8763 warning_at (loc
, OPT_Wmissing_declarations
,
8764 "%qD was used with no declaration before its definition", decl1
);
8766 /* This function exists in static storage.
8767 (This does not mean `static' in the C sense!) */
8768 TREE_STATIC (decl1
) = 1;
8770 /* This is the earliest point at which we might know the assembler
8771 name of the function. Thus, if it's set before this, die horribly. */
8772 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl1
));
8774 /* If #pragma weak was used, mark the decl weak now. */
8775 if (current_scope
== file_scope
)
8776 maybe_apply_pragma_weak (decl1
);
8778 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
8779 if (warn_main
&& MAIN_NAME_P (DECL_NAME (decl1
)))
8781 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1
)))
8782 != integer_type_node
)
8783 pedwarn (loc
, OPT_Wmain
, "return type of %qD is not %<int%>", decl1
);
8784 else if (TYPE_ATOMIC (TREE_TYPE (TREE_TYPE (decl1
))))
8785 pedwarn (loc
, OPT_Wmain
, "%<_Atomic%>-qualified return type of %qD",
8788 check_main_parameter_types (decl1
);
8790 if (!TREE_PUBLIC (decl1
))
8791 pedwarn (loc
, OPT_Wmain
,
8792 "%qD is normally a non-static function", decl1
);
8795 /* Record the decl so that the function name is defined.
8796 If we already have a decl for this name, and it is a FUNCTION_DECL,
8797 use the old decl. */
8799 current_function_decl
= pushdecl (decl1
);
8802 declare_parm_level ();
8804 restype
= TREE_TYPE (TREE_TYPE (current_function_decl
));
8805 resdecl
= build_decl (loc
, RESULT_DECL
, NULL_TREE
, restype
);
8806 DECL_ARTIFICIAL (resdecl
) = 1;
8807 DECL_IGNORED_P (resdecl
) = 1;
8808 DECL_RESULT (current_function_decl
) = resdecl
;
8810 start_fname_decls ();
8815 /* Subroutine of store_parm_decls which handles new-style function
8816 definitions (prototype format). The parms already have decls, so we
8817 need only record them as in effect and complain if any redundant
8818 old-style parm decls were written. */
8820 store_parm_decls_newstyle (tree fndecl
, const struct c_arg_info
*arg_info
)
8826 if (current_scope
->bindings
)
8828 error_at (DECL_SOURCE_LOCATION (fndecl
),
8829 "old-style parameter declarations in prototyped "
8830 "function definition");
8832 /* Get rid of the old-style declarations. */
8836 /* Don't issue this warning for nested functions, and don't issue this
8837 warning if we got here because ARG_INFO_TYPES was error_mark_node
8838 (this happens when a function definition has just an ellipsis in
8839 its parameter list). */
8840 else if (!in_system_header_at (input_location
)
8841 && !current_function_scope
8842 && arg_info
->types
!= error_mark_node
)
8843 warning_at (DECL_SOURCE_LOCATION (fndecl
), OPT_Wtraditional
,
8844 "traditional C rejects ISO C style function definitions");
8846 /* Now make all the parameter declarations visible in the function body.
8847 We can bypass most of the grunt work of pushdecl. */
8848 for (decl
= arg_info
->parms
; decl
; decl
= DECL_CHAIN (decl
))
8850 DECL_CONTEXT (decl
) = current_function_decl
;
8851 if (DECL_NAME (decl
))
8853 bind (DECL_NAME (decl
), decl
, current_scope
,
8854 /*invisible=*/false, /*nested=*/false,
8856 if (!TREE_USED (decl
))
8857 warn_if_shadowing (decl
);
8860 error_at (DECL_SOURCE_LOCATION (decl
), "parameter name omitted");
8863 /* Record the parameter list in the function declaration. */
8864 DECL_ARGUMENTS (fndecl
) = arg_info
->parms
;
8866 /* Now make all the ancillary declarations visible, likewise. */
8867 for (decl
= arg_info
->others
; decl
; decl
= DECL_CHAIN (decl
))
8869 DECL_CONTEXT (decl
) = current_function_decl
;
8870 if (DECL_NAME (decl
))
8871 bind (DECL_NAME (decl
), decl
, current_scope
,
8872 /*invisible=*/false,
8873 /*nested=*/(TREE_CODE (decl
) == FUNCTION_DECL
),
8877 /* And all the tag declarations. */
8878 FOR_EACH_VEC_SAFE_ELT_REVERSE (arg_info
->tags
, ix
, tag
)
8880 bind (tag
->id
, tag
->type
, current_scope
,
8881 /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION
);
8884 /* Subroutine of store_parm_decls which handles old-style function
8885 definitions (separate parameter list and declarations). */
8888 store_parm_decls_oldstyle (tree fndecl
, const struct c_arg_info
*arg_info
)
8890 struct c_binding
*b
;
8891 tree parm
, decl
, last
;
8892 tree parmids
= arg_info
->parms
;
8893 hash_set
<tree
> seen_args
;
8895 if (!in_system_header_at (input_location
))
8896 warning_at (DECL_SOURCE_LOCATION (fndecl
),
8897 OPT_Wold_style_definition
, "old-style function definition");
8899 /* Match each formal parameter name with its declaration. Save each
8900 decl in the appropriate TREE_PURPOSE slot of the parmids chain. */
8901 for (parm
= parmids
; parm
; parm
= TREE_CHAIN (parm
))
8903 if (TREE_VALUE (parm
) == NULL_TREE
)
8905 error_at (DECL_SOURCE_LOCATION (fndecl
),
8906 "parameter name missing from parameter list");
8907 TREE_PURPOSE (parm
) = NULL_TREE
;
8911 b
= I_SYMBOL_BINDING (TREE_VALUE (parm
));
8912 if (b
&& B_IN_CURRENT_SCOPE (b
))
8915 /* Skip erroneous parameters. */
8916 if (decl
== error_mark_node
)
8918 /* If we got something other than a PARM_DECL it is an error. */
8919 if (TREE_CODE (decl
) != PARM_DECL
)
8921 error_at (DECL_SOURCE_LOCATION (decl
),
8922 "%qD declared as a non-parameter", decl
);
8925 /* If the declaration is already marked, we have a duplicate
8926 name. Complain and ignore the duplicate. */
8927 else if (seen_args
.contains (decl
))
8929 error_at (DECL_SOURCE_LOCATION (decl
),
8930 "multiple parameters named %qD", decl
);
8931 TREE_PURPOSE (parm
) = NULL_TREE
;
8934 /* If the declaration says "void", complain and turn it into
8936 else if (VOID_TYPE_P (TREE_TYPE (decl
)))
8938 error_at (DECL_SOURCE_LOCATION (decl
),
8939 "parameter %qD declared with void type", decl
);
8940 TREE_TYPE (decl
) = integer_type_node
;
8941 DECL_ARG_TYPE (decl
) = integer_type_node
;
8942 layout_decl (decl
, 0);
8944 warn_if_shadowing (decl
);
8946 /* If no declaration found, default to int. */
8949 /* FIXME diagnostics: This should be the location of the argument,
8950 not the FNDECL. E.g., for an old-style declaration
8952 int f10(v) { blah; }
8954 We should use the location of the V, not the F10.
8955 Unfortunately, the V is an IDENTIFIER_NODE which has no
8956 location. In the future we need locations for c_arg_info
8959 See gcc.dg/Wshadow-3.c for an example of this problem. */
8960 decl
= build_decl (DECL_SOURCE_LOCATION (fndecl
),
8961 PARM_DECL
, TREE_VALUE (parm
), integer_type_node
);
8962 DECL_ARG_TYPE (decl
) = TREE_TYPE (decl
);
8964 warn_if_shadowing (decl
);
8967 pedwarn (DECL_SOURCE_LOCATION (decl
),
8968 OPT_Wimplicit_int
, "type of %qD defaults to %<int%>",
8971 warning_at (DECL_SOURCE_LOCATION (decl
),
8972 OPT_Wmissing_parameter_type
,
8973 "type of %qD defaults to %<int%>", decl
);
8976 TREE_PURPOSE (parm
) = decl
;
8977 seen_args
.add (decl
);
8980 /* Now examine the parms chain for incomplete declarations
8981 and declarations with no corresponding names. */
8983 for (b
= current_scope
->bindings
; b
; b
= b
->prev
)
8986 if (TREE_CODE (parm
) != PARM_DECL
)
8989 if (TREE_TYPE (parm
) != error_mark_node
8990 && !COMPLETE_TYPE_P (TREE_TYPE (parm
)))
8992 error_at (DECL_SOURCE_LOCATION (parm
),
8993 "parameter %qD has incomplete type", parm
);
8994 TREE_TYPE (parm
) = error_mark_node
;
8997 if (!seen_args
.contains (parm
))
8999 error_at (DECL_SOURCE_LOCATION (parm
),
9000 "declaration for parameter %qD but no such parameter",
9003 /* Pretend the parameter was not missing.
9004 This gets us to a standard state and minimizes
9005 further error messages. */
9006 parmids
= chainon (parmids
, tree_cons (parm
, 0, 0));
9010 /* Chain the declarations together in the order of the list of
9011 names. Store that chain in the function decl, replacing the
9012 list of names. Update the current scope to match. */
9013 DECL_ARGUMENTS (fndecl
) = NULL_TREE
;
9015 for (parm
= parmids
; parm
; parm
= TREE_CHAIN (parm
))
9016 if (TREE_PURPOSE (parm
))
9018 if (parm
&& TREE_PURPOSE (parm
))
9020 last
= TREE_PURPOSE (parm
);
9021 DECL_ARGUMENTS (fndecl
) = last
;
9023 for (parm
= TREE_CHAIN (parm
); parm
; parm
= TREE_CHAIN (parm
))
9024 if (TREE_PURPOSE (parm
))
9026 DECL_CHAIN (last
) = TREE_PURPOSE (parm
);
9027 last
= TREE_PURPOSE (parm
);
9029 DECL_CHAIN (last
) = NULL_TREE
;
9032 /* If there was a previous prototype,
9033 set the DECL_ARG_TYPE of each argument according to
9034 the type previously specified, and report any mismatches. */
9036 if (current_function_prototype_arg_types
)
9039 for (parm
= DECL_ARGUMENTS (fndecl
),
9040 type
= current_function_prototype_arg_types
;
9041 parm
|| (type
!= NULL_TREE
9042 && TREE_VALUE (type
) != error_mark_node
9043 && TYPE_MAIN_VARIANT (TREE_VALUE (type
)) != void_type_node
);
9044 parm
= DECL_CHAIN (parm
), type
= TREE_CHAIN (type
))
9046 if (parm
== NULL_TREE
9047 || type
== NULL_TREE
9048 || (TREE_VALUE (type
) != error_mark_node
9049 && TYPE_MAIN_VARIANT (TREE_VALUE (type
)) == void_type_node
))
9051 if (current_function_prototype_built_in
)
9052 warning_at (DECL_SOURCE_LOCATION (fndecl
),
9053 0, "number of arguments doesn%'t match "
9054 "built-in prototype");
9057 /* FIXME diagnostics: This should be the location of
9058 FNDECL, but there is bug when a prototype is
9059 declared inside function context, but defined
9060 outside of it (e.g., gcc.dg/pr15698-2.c). In
9061 which case FNDECL gets the location of the
9062 prototype, not the definition. */
9063 error_at (input_location
,
9064 "number of arguments doesn%'t match prototype");
9066 error_at (current_function_prototype_locus
,
9067 "prototype declaration");
9071 /* Type for passing arg must be consistent with that
9072 declared for the arg. ISO C says we take the unqualified
9073 type for parameters declared with qualified type. */
9074 if (TREE_TYPE (parm
) != error_mark_node
9075 && TREE_VALUE (type
) != error_mark_node
9076 && ((TYPE_ATOMIC (DECL_ARG_TYPE (parm
))
9077 != TYPE_ATOMIC (TREE_VALUE (type
)))
9078 || !comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm
)),
9079 TYPE_MAIN_VARIANT (TREE_VALUE (type
)))))
9081 if ((TYPE_ATOMIC (DECL_ARG_TYPE (parm
))
9082 == TYPE_ATOMIC (TREE_VALUE (type
)))
9083 && (TYPE_MAIN_VARIANT (TREE_TYPE (parm
))
9084 == TYPE_MAIN_VARIANT (TREE_VALUE (type
))))
9086 /* Adjust argument to match prototype. E.g. a previous
9087 `int foo(float);' prototype causes
9088 `int foo(x) float x; {...}' to be treated like
9089 `int foo(float x) {...}'. This is particularly
9090 useful for argument types like uid_t. */
9091 DECL_ARG_TYPE (parm
) = TREE_TYPE (parm
);
9093 if (targetm
.calls
.promote_prototypes (TREE_TYPE (current_function_decl
))
9094 && INTEGRAL_TYPE_P (TREE_TYPE (parm
))
9095 && (TYPE_PRECISION (TREE_TYPE (parm
))
9096 < TYPE_PRECISION (integer_type_node
)))
9097 DECL_ARG_TYPE (parm
)
9098 = c_type_promotes_to (TREE_TYPE (parm
));
9100 /* ??? Is it possible to get here with a
9101 built-in prototype or will it always have
9102 been diagnosed as conflicting with an
9103 old-style definition and discarded? */
9104 if (current_function_prototype_built_in
)
9105 warning_at (DECL_SOURCE_LOCATION (parm
),
9106 OPT_Wpedantic
, "promoted argument %qD "
9107 "doesn%'t match built-in prototype", parm
);
9110 pedwarn (DECL_SOURCE_LOCATION (parm
),
9111 OPT_Wpedantic
, "promoted argument %qD "
9112 "doesn%'t match prototype", parm
);
9113 pedwarn (current_function_prototype_locus
, OPT_Wpedantic
,
9114 "prototype declaration");
9119 if (current_function_prototype_built_in
)
9120 warning_at (DECL_SOURCE_LOCATION (parm
),
9121 0, "argument %qD doesn%'t match "
9122 "built-in prototype", parm
);
9125 error_at (DECL_SOURCE_LOCATION (parm
),
9126 "argument %qD doesn%'t match prototype", parm
);
9127 error_at (current_function_prototype_locus
,
9128 "prototype declaration");
9133 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl
)) = NULL_TREE
;
9136 /* Otherwise, create a prototype that would match. */
9140 tree actual
= NULL_TREE
, last
= NULL_TREE
, type
;
9142 for (parm
= DECL_ARGUMENTS (fndecl
); parm
; parm
= DECL_CHAIN (parm
))
9144 type
= tree_cons (NULL_TREE
, DECL_ARG_TYPE (parm
), NULL_TREE
);
9146 TREE_CHAIN (last
) = type
;
9151 type
= tree_cons (NULL_TREE
, void_type_node
, NULL_TREE
);
9153 TREE_CHAIN (last
) = type
;
9157 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
9158 of the type of this function, but we need to avoid having this
9159 affect the types of other similarly-typed functions, so we must
9160 first force the generation of an identical (but separate) type
9161 node for the relevant function type. The new node we create
9162 will be a variant of the main variant of the original function
9165 TREE_TYPE (fndecl
) = build_variant_type_copy (TREE_TYPE (fndecl
));
9167 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl
)) = actual
;
9171 /* Store parameter declarations passed in ARG_INFO into the current
9172 function declaration. */
9175 store_parm_decls_from (struct c_arg_info
*arg_info
)
9177 current_function_arg_info
= arg_info
;
9178 store_parm_decls ();
9181 /* Called by walk_tree to look for and update context-less labels. */
9184 set_labels_context_r (tree
*tp
, int *walk_subtrees
, void *data
)
9186 if (TREE_CODE (*tp
) == LABEL_EXPR
9187 && DECL_CONTEXT (LABEL_EXPR_LABEL (*tp
)) == NULL_TREE
)
9189 DECL_CONTEXT (LABEL_EXPR_LABEL (*tp
)) = static_cast<tree
>(data
);
9196 /* Store the parameter declarations into the current function declaration.
9197 This is called after parsing the parameter declarations, before
9198 digesting the body of the function.
9200 For an old-style definition, construct a prototype out of the old-style
9201 parameter declarations and inject it into the function's type. */
9204 store_parm_decls (void)
9206 tree fndecl
= current_function_decl
;
9209 /* The argument information block for FNDECL. */
9210 struct c_arg_info
*arg_info
= current_function_arg_info
;
9211 current_function_arg_info
= 0;
9213 /* True if this definition is written with a prototype. Note:
9214 despite C99 6.7.5.3p14, we can *not* treat an empty argument
9215 list in a function definition as equivalent to (void) -- an
9216 empty argument list specifies the function has no parameters,
9217 but only (void) sets up a prototype for future calls. */
9218 proto
= arg_info
->types
!= 0;
9221 store_parm_decls_newstyle (fndecl
, arg_info
);
9223 store_parm_decls_oldstyle (fndecl
, arg_info
);
9225 /* The next call to push_scope will be a function body. */
9227 next_is_function_body
= true;
9229 /* Write a record describing this function definition to the prototypes
9230 file (if requested). */
9232 gen_aux_info_record (fndecl
, 1, 0, proto
);
9234 /* Initialize the RTL code for the function. */
9235 allocate_struct_function (fndecl
, false);
9237 if (warn_unused_local_typedefs
)
9238 cfun
->language
= ggc_cleared_alloc
<language_function
> ();
9240 /* Begin the statement tree for this function. */
9241 DECL_SAVED_TREE (fndecl
) = push_stmt_list ();
9243 /* ??? Insert the contents of the pending sizes list into the function
9244 to be evaluated. The only reason left to have this is
9245 void foo(int n, int array[n++])
9246 because we throw away the array type in favor of a pointer type, and
9247 thus won't naturally see the SAVE_EXPR containing the increment. All
9248 other pending sizes would be handled by gimplify_parameters. */
9249 if (arg_info
->pending_sizes
)
9251 /* In very special circumstances, e.g. for code like
9253 void f (int a[i += 2]) {}
9254 we need to execute the atomic assignment on function entry.
9255 But in this case, it is not just a straight store, it has the
9256 op= form, which means that build_atomic_assign has generated
9257 gotos, labels, etc. Because at that time the function decl
9258 for F has not been created yet, those labels do not have any
9259 function context. But we have the fndecl now, so update the
9260 labels accordingly. gimplify_expr would crash otherwise. */
9261 walk_tree_without_duplicates (&arg_info
->pending_sizes
,
9262 set_labels_context_r
, fndecl
);
9263 add_stmt (arg_info
->pending_sizes
);
9267 /* Store PARM_DECLs in PARMS into scope temporarily. Used for
9268 c_finish_omp_declare_simd for function prototypes. No diagnostics
9272 temp_store_parm_decls (tree fndecl
, tree parms
)
9275 for (tree p
= parms
; p
; p
= DECL_CHAIN (p
))
9277 DECL_CONTEXT (p
) = fndecl
;
9279 bind (DECL_NAME (p
), p
, current_scope
,
9280 /*invisible=*/false, /*nested=*/false,
9285 /* Undo what temp_store_parm_decls did. */
9288 temp_pop_parm_decls (void)
9290 /* Clear all bindings in this temporary scope, so that
9291 pop_scope doesn't create a BLOCK. */
9292 struct c_binding
*b
= current_scope
->bindings
;
9293 current_scope
->bindings
= NULL
;
9294 for (; b
; b
= free_binding_and_advance (b
))
9296 gcc_assert (TREE_CODE (b
->decl
) == PARM_DECL
9297 || b
->decl
== error_mark_node
);
9298 gcc_assert (I_SYMBOL_BINDING (b
->id
) == b
);
9299 I_SYMBOL_BINDING (b
->id
) = b
->shadowed
;
9300 if (b
->shadowed
&& b
->shadowed
->u
.type
)
9301 TREE_TYPE (b
->shadowed
->decl
) = b
->shadowed
->u
.type
;
9307 /* Finish up a function declaration and compile that function
9308 all the way to assembler language output. Then free the storage
9309 for the function definition.
9311 This is called after parsing the body of the function definition. */
9314 finish_function (void)
9316 tree fndecl
= current_function_decl
;
9318 if (c_dialect_objc ())
9319 objc_finish_function ();
9321 if (TREE_CODE (fndecl
) == FUNCTION_DECL
9322 && targetm
.calls
.promote_prototypes (TREE_TYPE (fndecl
)))
9324 tree args
= DECL_ARGUMENTS (fndecl
);
9325 for (; args
; args
= DECL_CHAIN (args
))
9327 tree type
= TREE_TYPE (args
);
9328 if (INTEGRAL_TYPE_P (type
)
9329 && TYPE_PRECISION (type
) < TYPE_PRECISION (integer_type_node
))
9330 DECL_ARG_TYPE (args
) = c_type_promotes_to (type
);
9334 if (DECL_INITIAL (fndecl
) && DECL_INITIAL (fndecl
) != error_mark_node
)
9335 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl
)) = fndecl
;
9337 /* Must mark the RESULT_DECL as being in this function. */
9339 if (DECL_RESULT (fndecl
) && DECL_RESULT (fndecl
) != error_mark_node
)
9340 DECL_CONTEXT (DECL_RESULT (fndecl
)) = fndecl
;
9342 if (MAIN_NAME_P (DECL_NAME (fndecl
)) && flag_hosted
9343 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl
)))
9344 == integer_type_node
&& flag_isoc99
)
9346 /* Hack. We don't want the middle-end to warn that this return
9347 is unreachable, so we mark its location as special. Using
9348 UNKNOWN_LOCATION has the problem that it gets clobbered in
9349 annotate_one_with_locus. A cleaner solution might be to
9350 ensure ! should_carry_locus_p (stmt), but that needs a flag.
9352 c_finish_return (BUILTINS_LOCATION
, integer_zero_node
, NULL_TREE
);
9355 /* Tie off the statement tree for this function. */
9356 DECL_SAVED_TREE (fndecl
) = pop_stmt_list (DECL_SAVED_TREE (fndecl
));
9358 /* If the function has _Cilk_spawn in front of a function call inside it
9359 i.e. it is a spawning function, then add the appropriate Cilk plus
9360 functions inside. */
9361 if (fn_contains_cilk_spawn_p (cfun
))
9362 cfun
->cilk_frame_decl
= insert_cilk_frame (fndecl
);
9364 finish_fname_decls ();
9366 /* Complain if there's just no return statement. */
9367 if (warn_return_type
9368 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl
))) != VOID_TYPE
9369 && !current_function_returns_value
&& !current_function_returns_null
9370 /* Don't complain if we are no-return. */
9371 && !current_function_returns_abnormally
9372 /* Don't complain if we are declared noreturn. */
9373 && !TREE_THIS_VOLATILE (fndecl
)
9374 /* Don't warn for main(). */
9375 && !MAIN_NAME_P (DECL_NAME (fndecl
))
9376 /* Or if they didn't actually specify a return type. */
9377 && !C_FUNCTION_IMPLICIT_INT (fndecl
)
9378 /* Normally, with -Wreturn-type, flow will complain, but we might
9379 optimize out static functions. */
9380 && !TREE_PUBLIC (fndecl
))
9382 warning (OPT_Wreturn_type
,
9383 "no return statement in function returning non-void");
9384 TREE_NO_WARNING (fndecl
) = 1;
9387 /* Complain about parameters that are only set, but never otherwise used. */
9388 if (warn_unused_but_set_parameter
)
9392 for (decl
= DECL_ARGUMENTS (fndecl
);
9394 decl
= DECL_CHAIN (decl
))
9395 if (TREE_USED (decl
)
9396 && TREE_CODE (decl
) == PARM_DECL
9397 && !DECL_READ_P (decl
)
9399 && !DECL_ARTIFICIAL (decl
)
9400 && !TREE_NO_WARNING (decl
))
9401 warning_at (DECL_SOURCE_LOCATION (decl
),
9402 OPT_Wunused_but_set_parameter
,
9403 "parameter %qD set but not used", decl
);
9406 /* Complain about locally defined typedefs that are not used in this
9408 maybe_warn_unused_local_typedefs ();
9410 /* Possibly warn about unused parameters. */
9411 if (warn_unused_parameter
)
9412 do_warn_unused_parameter (fndecl
);
9414 /* Store the end of the function, so that we get good line number
9415 info for the epilogue. */
9416 cfun
->function_end_locus
= input_location
;
9418 /* Finalize the ELF visibility for the function. */
9419 c_determine_visibility (fndecl
);
9421 /* For GNU C extern inline functions disregard inline limits. */
9422 if (DECL_EXTERNAL (fndecl
)
9423 && DECL_DECLARED_INLINE_P (fndecl
)
9424 && (flag_gnu89_inline
9425 || lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (fndecl
))))
9426 DECL_DISREGARD_INLINE_LIMITS (fndecl
) = 1;
9428 /* Genericize before inlining. Delay genericizing nested functions
9429 until their parent function is genericized. Since finalizing
9430 requires GENERIC, delay that as well. */
9432 if (DECL_INITIAL (fndecl
) && DECL_INITIAL (fndecl
) != error_mark_node
9433 && !undef_nested_function
)
9435 if (!decl_function_context (fndecl
))
9437 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE
, fndecl
);
9438 c_genericize (fndecl
);
9440 /* ??? Objc emits functions after finalizing the compilation unit.
9441 This should be cleaned up later and this conditional removed. */
9442 if (symtab
->global_info_ready
)
9444 cgraph_node::add_new_function (fndecl
, false);
9447 cgraph_node::finalize_function (fndecl
, false);
9451 /* Register this function with cgraph just far enough to get it
9452 added to our parent's nested function list. Handy, since the
9453 C front end doesn't have such a list. */
9454 (void) cgraph_node::get_create (fndecl
);
9458 if (!decl_function_context (fndecl
))
9459 undef_nested_function
= false;
9461 if (cfun
->language
!= NULL
)
9463 ggc_free (cfun
->language
);
9464 cfun
->language
= NULL
;
9467 /* We're leaving the context of this function, so zap cfun.
9468 It's still in DECL_STRUCT_FUNCTION, and we'll restore it in
9469 tree_rest_of_compilation. */
9471 invoke_plugin_callbacks (PLUGIN_FINISH_PARSE_FUNCTION
, current_function_decl
);
9472 current_function_decl
= NULL
;
9475 /* Check the declarations given in a for-loop for satisfying the C99
9476 constraints. If exactly one such decl is found, return it. LOC is
9477 the location of the opening parenthesis of the for loop. The last
9478 parameter allows you to control the "for loop initial declarations
9479 are only allowed in C99 mode". Normally, you should pass
9480 flag_isoc99 as that parameter. But in some cases (Objective-C
9481 foreach loop, for example) we want to run the checks in this
9482 function even if not in C99 mode, so we allow the caller to turn
9483 off the error about not being in C99 mode.
9487 check_for_loop_decls (location_t loc
, bool turn_off_iso_c99_error
)
9489 struct c_binding
*b
;
9490 tree one_decl
= NULL_TREE
;
9493 if (!turn_off_iso_c99_error
)
9495 static bool hint
= true;
9496 /* If we get here, declarations have been used in a for loop without
9497 the C99 for loop scope. This doesn't make much sense, so don't
9499 error_at (loc
, "%<for%> loop initial declarations "
9500 "are only allowed in C99 or C11 mode");
9504 "use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 "
9505 "to compile your code");
9510 /* C99 subclause 6.8.5 paragraph 3:
9512 [#3] The declaration part of a for statement shall only
9513 declare identifiers for objects having storage class auto or
9516 It isn't clear whether, in this sentence, "identifiers" binds to
9517 "shall only declare" or to "objects" - that is, whether all identifiers
9518 declared must be identifiers for objects, or whether the restriction
9519 only applies to those that are. (A question on this in comp.std.c
9520 in November 2000 received no answer.) We implement the strictest
9521 interpretation, to avoid creating an extension which later causes
9524 for (b
= current_scope
->bindings
; b
; b
= b
->prev
)
9527 tree decl
= b
->decl
;
9532 switch (TREE_CODE (decl
))
9536 location_t decl_loc
= DECL_SOURCE_LOCATION (decl
);
9537 if (TREE_STATIC (decl
))
9539 "declaration of static variable %qD in %<for%> loop "
9540 "initial declaration", decl
);
9541 else if (DECL_EXTERNAL (decl
))
9543 "declaration of %<extern%> variable %qD in %<for%> loop "
9544 "initial declaration", decl
);
9550 "%<struct %E%> declared in %<for%> loop initial "
9555 "%<union %E%> declared in %<for%> loop initial declaration",
9559 error_at (loc
, "%<enum %E%> declared in %<for%> loop "
9560 "initial declaration", id
);
9563 error_at (loc
, "declaration of non-variable "
9564 "%qD in %<for%> loop initial declaration", decl
);
9571 return n_decls
== 1 ? one_decl
: NULL_TREE
;
9574 /* Save and reinitialize the variables
9575 used during compilation of a C function. */
9578 c_push_function_context (void)
9580 struct language_function
*p
= cfun
->language
;
9581 /* cfun->language might have been already allocated by the use of
9582 -Wunused-local-typedefs. In that case, just re-use it. */
9584 cfun
->language
= p
= ggc_cleared_alloc
<language_function
> ();
9586 p
->base
.x_stmt_tree
= c_stmt_tree
;
9587 c_stmt_tree
.x_cur_stmt_list
= vec_safe_copy (c_stmt_tree
.x_cur_stmt_list
);
9588 p
->x_break_label
= c_break_label
;
9589 p
->x_cont_label
= c_cont_label
;
9590 p
->x_switch_stack
= c_switch_stack
;
9591 p
->arg_info
= current_function_arg_info
;
9592 p
->returns_value
= current_function_returns_value
;
9593 p
->returns_null
= current_function_returns_null
;
9594 p
->returns_abnormally
= current_function_returns_abnormally
;
9595 p
->warn_about_return_type
= warn_about_return_type
;
9597 push_function_context ();
9600 /* Restore the variables used during compilation of a C function. */
9603 c_pop_function_context (void)
9605 struct language_function
*p
;
9607 pop_function_context ();
9610 /* When -Wunused-local-typedefs is in effect, cfun->languages is
9611 used to store data throughout the life time of the current cfun,
9612 So don't deallocate it. */
9613 if (!warn_unused_local_typedefs
)
9614 cfun
->language
= NULL
;
9616 if (DECL_STRUCT_FUNCTION (current_function_decl
) == 0
9617 && DECL_SAVED_TREE (current_function_decl
) == NULL_TREE
)
9619 /* Stop pointing to the local nodes about to be freed. */
9620 /* But DECL_INITIAL must remain nonzero so we know this
9621 was an actual function definition. */
9622 DECL_INITIAL (current_function_decl
) = error_mark_node
;
9623 DECL_ARGUMENTS (current_function_decl
) = NULL_TREE
;
9626 c_stmt_tree
= p
->base
.x_stmt_tree
;
9627 p
->base
.x_stmt_tree
.x_cur_stmt_list
= NULL
;
9628 c_break_label
= p
->x_break_label
;
9629 c_cont_label
= p
->x_cont_label
;
9630 c_switch_stack
= p
->x_switch_stack
;
9631 current_function_arg_info
= p
->arg_info
;
9632 current_function_returns_value
= p
->returns_value
;
9633 current_function_returns_null
= p
->returns_null
;
9634 current_function_returns_abnormally
= p
->returns_abnormally
;
9635 warn_about_return_type
= p
->warn_about_return_type
;
9638 /* The functions below are required for functionality of doing
9639 function at once processing in the C front end. Currently these
9640 functions are not called from anywhere in the C front end, but as
9641 these changes continue, that will change. */
9643 /* Returns the stmt_tree (if any) to which statements are currently
9644 being added. If there is no active statement-tree, NULL is
9648 current_stmt_tree (void)
9650 return &c_stmt_tree
;
9653 /* Return the global value of T as a symbol. */
9656 identifier_global_value (tree t
)
9658 struct c_binding
*b
;
9660 for (b
= I_SYMBOL_BINDING (t
); b
; b
= b
->shadowed
)
9661 if (B_IN_FILE_SCOPE (b
) || B_IN_EXTERNAL_SCOPE (b
))
9667 /* In C, the only C-linkage public declaration is at file scope. */
9670 c_linkage_bindings (tree name
)
9672 return identifier_global_value (name
);
9675 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
9676 otherwise the name is found in ridpointers from RID_INDEX. */
9679 record_builtin_type (enum rid rid_index
, const char *name
, tree type
)
9683 id
= ridpointers
[(int) rid_index
];
9685 id
= get_identifier (name
);
9686 decl
= build_decl (UNKNOWN_LOCATION
, TYPE_DECL
, id
, type
);
9688 if (debug_hooks
->type_decl
)
9689 debug_hooks
->type_decl (decl
, false);
9692 /* Build the void_list_node (void_type_node having been created). */
9694 build_void_list_node (void)
9696 tree t
= build_tree_list (NULL_TREE
, void_type_node
);
9700 /* Return a c_parm structure with the given SPECS, ATTRS and DECLARATOR. */
9703 build_c_parm (struct c_declspecs
*specs
, tree attrs
,
9704 struct c_declarator
*declarator
)
9706 struct c_parm
*ret
= XOBNEW (&parser_obstack
, struct c_parm
);
9709 ret
->declarator
= declarator
;
9713 /* Return a declarator with nested attributes. TARGET is the inner
9714 declarator to which these attributes apply. ATTRS are the
9717 struct c_declarator
*
9718 build_attrs_declarator (tree attrs
, struct c_declarator
*target
)
9720 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
9721 ret
->kind
= cdk_attrs
;
9722 ret
->declarator
= target
;
9723 ret
->u
.attrs
= attrs
;
9727 /* Return a declarator for a function with arguments specified by ARGS
9728 and return type specified by TARGET. */
9730 struct c_declarator
*
9731 build_function_declarator (struct c_arg_info
*args
,
9732 struct c_declarator
*target
)
9734 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
9735 ret
->kind
= cdk_function
;
9736 ret
->declarator
= target
;
9737 ret
->u
.arg_info
= args
;
9741 /* Return a declarator for the identifier IDENT (which may be
9742 NULL_TREE for an abstract declarator). */
9744 struct c_declarator
*
9745 build_id_declarator (tree ident
)
9747 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
9749 ret
->declarator
= 0;
9751 /* Default value - may get reset to a more precise location. */
9752 ret
->id_loc
= input_location
;
9756 /* Return something to represent absolute declarators containing a *.
9757 TARGET is the absolute declarator that the * contains.
9758 TYPE_QUALS_ATTRS is a structure for type qualifiers and attributes
9759 to apply to the pointer type. */
9761 struct c_declarator
*
9762 make_pointer_declarator (struct c_declspecs
*type_quals_attrs
,
9763 struct c_declarator
*target
)
9767 struct c_declarator
*itarget
= target
;
9768 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
9769 if (type_quals_attrs
)
9771 attrs
= type_quals_attrs
->attrs
;
9772 quals
= quals_from_declspecs (type_quals_attrs
);
9773 if (attrs
!= NULL_TREE
)
9774 itarget
= build_attrs_declarator (attrs
, target
);
9776 ret
->kind
= cdk_pointer
;
9777 ret
->declarator
= itarget
;
9778 ret
->u
.pointer_quals
= quals
;
9782 /* Return a pointer to a structure for an empty list of declaration
9785 struct c_declspecs
*
9786 build_null_declspecs (void)
9788 struct c_declspecs
*ret
= XOBNEW (&parser_obstack
, struct c_declspecs
);
9789 memset (ret
, 0, sizeof *ret
);
9790 ret
->align_log
= -1;
9791 ret
->typespec_word
= cts_none
;
9792 ret
->storage_class
= csc_none
;
9793 ret
->expr_const_operands
= true;
9794 ret
->typespec_kind
= ctsk_none
;
9795 ret
->address_space
= ADDR_SPACE_GENERIC
;
9799 /* Add the address space ADDRSPACE to the declaration specifiers
9800 SPECS, returning SPECS. */
9802 struct c_declspecs
*
9803 declspecs_add_addrspace (source_location location
,
9804 struct c_declspecs
*specs
, addr_space_t as
)
9806 specs
->non_sc_seen_p
= true;
9807 specs
->declspecs_seen_p
= true;
9809 if (!ADDR_SPACE_GENERIC_P (specs
->address_space
)
9810 && specs
->address_space
!= as
)
9811 error ("incompatible address space qualifiers %qs and %qs",
9812 c_addr_space_name (as
),
9813 c_addr_space_name (specs
->address_space
));
9816 specs
->address_space
= as
;
9817 specs
->locations
[cdw_address_space
] = location
;
9822 /* Add the type qualifier QUAL to the declaration specifiers SPECS,
9825 struct c_declspecs
*
9826 declspecs_add_qual (source_location loc
,
9827 struct c_declspecs
*specs
, tree qual
)
9831 specs
->non_sc_seen_p
= true;
9832 specs
->declspecs_seen_p
= true;
9833 gcc_assert (TREE_CODE (qual
) == IDENTIFIER_NODE
9834 && C_IS_RESERVED_WORD (qual
));
9835 i
= C_RID_CODE (qual
);
9836 location_t prev_loc
= UNKNOWN_LOCATION
;
9840 dupe
= specs
->const_p
;
9841 specs
->const_p
= true;
9842 prev_loc
= specs
->locations
[cdw_const
];
9843 specs
->locations
[cdw_const
] = loc
;
9846 dupe
= specs
->volatile_p
;
9847 specs
->volatile_p
= true;
9848 prev_loc
= specs
->locations
[cdw_volatile
];
9849 specs
->locations
[cdw_volatile
] = loc
;
9852 dupe
= specs
->restrict_p
;
9853 specs
->restrict_p
= true;
9854 prev_loc
= specs
->locations
[cdw_restrict
];
9855 specs
->locations
[cdw_restrict
] = loc
;
9858 dupe
= specs
->atomic_p
;
9859 specs
->atomic_p
= true;
9860 prev_loc
= specs
->locations
[cdw_atomic
];
9861 specs
->locations
[cdw_atomic
] = loc
;
9868 bool warned
= pedwarn_c90 (loc
, OPT_Wpedantic
,
9869 "duplicate %qE declaration specifier", qual
);
9871 && warn_duplicate_decl_specifier
9872 && prev_loc
>= RESERVED_LOCATION_COUNT
9873 && !from_macro_expansion_at (prev_loc
)
9874 && !from_macro_expansion_at (loc
))
9875 warning_at (loc
, OPT_Wduplicate_decl_specifier
,
9876 "duplicate %qE declaration specifier", qual
);
9881 /* Add the type specifier TYPE to the declaration specifiers SPECS,
9884 struct c_declspecs
*
9885 declspecs_add_type (location_t loc
, struct c_declspecs
*specs
,
9886 struct c_typespec spec
)
9888 tree type
= spec
.spec
;
9889 specs
->non_sc_seen_p
= true;
9890 specs
->declspecs_seen_p
= true;
9891 specs
->typespec_kind
= spec
.kind
;
9892 if (TREE_DEPRECATED (type
))
9893 specs
->deprecated_p
= true;
9895 /* Handle type specifier keywords. */
9896 if (TREE_CODE (type
) == IDENTIFIER_NODE
9897 && C_IS_RESERVED_WORD (type
)
9898 && C_RID_CODE (type
) != RID_CXX_COMPAT_WARN
)
9900 enum rid i
= C_RID_CODE (type
);
9903 error_at (loc
, "two or more data types in declaration specifiers");
9906 if ((int) i
<= (int) RID_LAST_MODIFIER
)
9908 /* "long", "short", "signed", "unsigned", "_Complex" or "_Sat". */
9913 if (specs
->long_long_p
)
9915 error_at (loc
, "%<long long long%> is too long for GCC");
9920 if (specs
->typespec_word
== cts_double
)
9923 ("both %<long long%> and %<double%> in "
9924 "declaration specifiers"));
9927 pedwarn_c90 (loc
, OPT_Wlong_long
,
9928 "ISO C90 does not support %<long long%>");
9929 specs
->long_long_p
= 1;
9930 specs
->locations
[cdw_long_long
] = loc
;
9935 ("both %<long%> and %<short%> in "
9936 "declaration specifiers"));
9937 else if (specs
->typespec_word
== cts_auto_type
)
9939 ("both %<long%> and %<__auto_type%> in "
9940 "declaration specifiers"));
9941 else if (specs
->typespec_word
== cts_void
)
9943 ("both %<long%> and %<void%> in "
9944 "declaration specifiers"));
9945 else if (specs
->typespec_word
== cts_int_n
)
9947 ("both %<long%> and %<__int%d%> in "
9948 "declaration specifiers"),
9949 int_n_data
[specs
->int_n_idx
].bitsize
);
9950 else if (specs
->typespec_word
== cts_bool
)
9952 ("both %<long%> and %<_Bool%> in "
9953 "declaration specifiers"));
9954 else if (specs
->typespec_word
== cts_char
)
9956 ("both %<long%> and %<char%> in "
9957 "declaration specifiers"));
9958 else if (specs
->typespec_word
== cts_float
)
9960 ("both %<long%> and %<float%> in "
9961 "declaration specifiers"));
9962 else if (specs
->typespec_word
== cts_floatn_nx
)
9964 ("both %<long%> and %<_Float%d%s%> in "
9965 "declaration specifiers"),
9966 floatn_nx_types
[specs
->floatn_nx_idx
].n
,
9967 (floatn_nx_types
[specs
->floatn_nx_idx
].extended
9970 else if (specs
->typespec_word
== cts_dfloat32
)
9972 ("both %<long%> and %<_Decimal32%> in "
9973 "declaration specifiers"));
9974 else if (specs
->typespec_word
== cts_dfloat64
)
9976 ("both %<long%> and %<_Decimal64%> in "
9977 "declaration specifiers"));
9978 else if (specs
->typespec_word
== cts_dfloat128
)
9980 ("both %<long%> and %<_Decimal128%> in "
9981 "declaration specifiers"));
9984 specs
->long_p
= true;
9985 specs
->locations
[cdw_long
] = loc
;
9989 dupe
= specs
->short_p
;
9992 ("both %<long%> and %<short%> in "
9993 "declaration specifiers"));
9994 else if (specs
->typespec_word
== cts_auto_type
)
9996 ("both %<short%> and %<__auto_type%> in "
9997 "declaration specifiers"));
9998 else if (specs
->typespec_word
== cts_void
)
10000 ("both %<short%> and %<void%> in "
10001 "declaration specifiers"));
10002 else if (specs
->typespec_word
== cts_int_n
)
10004 ("both %<short%> and %<__int%d%> in "
10005 "declaration specifiers"),
10006 int_n_data
[specs
->int_n_idx
].bitsize
);
10007 else if (specs
->typespec_word
== cts_bool
)
10009 ("both %<short%> and %<_Bool%> in "
10010 "declaration specifiers"));
10011 else if (specs
->typespec_word
== cts_char
)
10013 ("both %<short%> and %<char%> in "
10014 "declaration specifiers"));
10015 else if (specs
->typespec_word
== cts_float
)
10017 ("both %<short%> and %<float%> in "
10018 "declaration specifiers"));
10019 else if (specs
->typespec_word
== cts_double
)
10021 ("both %<short%> and %<double%> in "
10022 "declaration specifiers"));
10023 else if (specs
->typespec_word
== cts_floatn_nx
)
10025 ("both %<short%> and %<_Float%d%s%> in "
10026 "declaration specifiers"),
10027 floatn_nx_types
[specs
->floatn_nx_idx
].n
,
10028 (floatn_nx_types
[specs
->floatn_nx_idx
].extended
10031 else if (specs
->typespec_word
== cts_dfloat32
)
10033 ("both %<short%> and %<_Decimal32%> in "
10034 "declaration specifiers"));
10035 else if (specs
->typespec_word
== cts_dfloat64
)
10037 ("both %<short%> and %<_Decimal64%> in "
10038 "declaration specifiers"));
10039 else if (specs
->typespec_word
== cts_dfloat128
)
10041 ("both %<short%> and %<_Decimal128%> in "
10042 "declaration specifiers"));
10045 specs
->short_p
= true;
10046 specs
->locations
[cdw_short
] = loc
;
10050 dupe
= specs
->signed_p
;
10051 if (specs
->unsigned_p
)
10053 ("both %<signed%> and %<unsigned%> in "
10054 "declaration specifiers"));
10055 else if (specs
->typespec_word
== cts_auto_type
)
10057 ("both %<signed%> and %<__auto_type%> in "
10058 "declaration specifiers"));
10059 else if (specs
->typespec_word
== cts_void
)
10061 ("both %<signed%> and %<void%> in "
10062 "declaration specifiers"));
10063 else if (specs
->typespec_word
== cts_bool
)
10065 ("both %<signed%> and %<_Bool%> in "
10066 "declaration specifiers"));
10067 else if (specs
->typespec_word
== cts_float
)
10069 ("both %<signed%> and %<float%> in "
10070 "declaration specifiers"));
10071 else if (specs
->typespec_word
== cts_double
)
10073 ("both %<signed%> and %<double%> in "
10074 "declaration specifiers"));
10075 else if (specs
->typespec_word
== cts_floatn_nx
)
10077 ("both %<signed%> and %<_Float%d%s%> in "
10078 "declaration specifiers"),
10079 floatn_nx_types
[specs
->floatn_nx_idx
].n
,
10080 (floatn_nx_types
[specs
->floatn_nx_idx
].extended
10083 else if (specs
->typespec_word
== cts_dfloat32
)
10085 ("both %<signed%> and %<_Decimal32%> in "
10086 "declaration specifiers"));
10087 else if (specs
->typespec_word
== cts_dfloat64
)
10089 ("both %<signed%> and %<_Decimal64%> in "
10090 "declaration specifiers"));
10091 else if (specs
->typespec_word
== cts_dfloat128
)
10093 ("both %<signed%> and %<_Decimal128%> in "
10094 "declaration specifiers"));
10097 specs
->signed_p
= true;
10098 specs
->locations
[cdw_signed
] = loc
;
10102 dupe
= specs
->unsigned_p
;
10103 if (specs
->signed_p
)
10105 ("both %<signed%> and %<unsigned%> in "
10106 "declaration specifiers"));
10107 else if (specs
->typespec_word
== cts_auto_type
)
10109 ("both %<unsigned%> and %<__auto_type%> in "
10110 "declaration specifiers"));
10111 else if (specs
->typespec_word
== cts_void
)
10113 ("both %<unsigned%> and %<void%> in "
10114 "declaration specifiers"));
10115 else if (specs
->typespec_word
== cts_bool
)
10117 ("both %<unsigned%> and %<_Bool%> in "
10118 "declaration specifiers"));
10119 else if (specs
->typespec_word
== cts_float
)
10121 ("both %<unsigned%> and %<float%> in "
10122 "declaration specifiers"));
10123 else if (specs
->typespec_word
== cts_double
)
10125 ("both %<unsigned%> and %<double%> in "
10126 "declaration specifiers"));
10127 else if (specs
->typespec_word
== cts_floatn_nx
)
10129 ("both %<unsigned%> and %<_Float%d%s%> in "
10130 "declaration specifiers"),
10131 floatn_nx_types
[specs
->floatn_nx_idx
].n
,
10132 (floatn_nx_types
[specs
->floatn_nx_idx
].extended
10135 else if (specs
->typespec_word
== cts_dfloat32
)
10137 ("both %<unsigned%> and %<_Decimal32%> in "
10138 "declaration specifiers"));
10139 else if (specs
->typespec_word
== cts_dfloat64
)
10141 ("both %<unsigned%> and %<_Decimal64%> in "
10142 "declaration specifiers"));
10143 else if (specs
->typespec_word
== cts_dfloat128
)
10145 ("both %<unsigned%> and %<_Decimal128%> in "
10146 "declaration specifiers"));
10149 specs
->unsigned_p
= true;
10150 specs
->locations
[cdw_unsigned
] = loc
;
10154 dupe
= specs
->complex_p
;
10155 if (!in_system_header_at (loc
))
10156 pedwarn_c90 (loc
, OPT_Wpedantic
,
10157 "ISO C90 does not support complex types");
10158 if (specs
->typespec_word
== cts_auto_type
)
10160 ("both %<complex%> and %<__auto_type%> in "
10161 "declaration specifiers"));
10162 else if (specs
->typespec_word
== cts_void
)
10164 ("both %<complex%> and %<void%> in "
10165 "declaration specifiers"));
10166 else if (specs
->typespec_word
== cts_bool
)
10168 ("both %<complex%> and %<_Bool%> in "
10169 "declaration specifiers"));
10170 else if (specs
->typespec_word
== cts_dfloat32
)
10172 ("both %<complex%> and %<_Decimal32%> in "
10173 "declaration specifiers"));
10174 else if (specs
->typespec_word
== cts_dfloat64
)
10176 ("both %<complex%> and %<_Decimal64%> in "
10177 "declaration specifiers"));
10178 else if (specs
->typespec_word
== cts_dfloat128
)
10180 ("both %<complex%> and %<_Decimal128%> in "
10181 "declaration specifiers"));
10182 else if (specs
->typespec_word
== cts_fract
)
10184 ("both %<complex%> and %<_Fract%> in "
10185 "declaration specifiers"));
10186 else if (specs
->typespec_word
== cts_accum
)
10188 ("both %<complex%> and %<_Accum%> in "
10189 "declaration specifiers"));
10190 else if (specs
->saturating_p
)
10192 ("both %<complex%> and %<_Sat%> in "
10193 "declaration specifiers"));
10196 specs
->complex_p
= true;
10197 specs
->locations
[cdw_complex
] = loc
;
10201 dupe
= specs
->saturating_p
;
10202 pedwarn (loc
, OPT_Wpedantic
,
10203 "ISO C does not support saturating types");
10204 if (specs
->typespec_word
== cts_int_n
)
10207 ("both %<_Sat%> and %<__int%d%> in "
10208 "declaration specifiers"),
10209 int_n_data
[specs
->int_n_idx
].bitsize
);
10211 else if (specs
->typespec_word
== cts_auto_type
)
10213 ("both %<_Sat%> and %<__auto_type%> in "
10214 "declaration specifiers"));
10215 else if (specs
->typespec_word
== cts_void
)
10217 ("both %<_Sat%> and %<void%> in "
10218 "declaration specifiers"));
10219 else if (specs
->typespec_word
== cts_bool
)
10221 ("both %<_Sat%> and %<_Bool%> in "
10222 "declaration specifiers"));
10223 else if (specs
->typespec_word
== cts_char
)
10225 ("both %<_Sat%> and %<char%> in "
10226 "declaration specifiers"));
10227 else if (specs
->typespec_word
== cts_int
)
10229 ("both %<_Sat%> and %<int%> in "
10230 "declaration specifiers"));
10231 else if (specs
->typespec_word
== cts_float
)
10233 ("both %<_Sat%> and %<float%> in "
10234 "declaration specifiers"));
10235 else if (specs
->typespec_word
== cts_double
)
10237 ("both %<_Sat%> and %<double%> in "
10238 "declaration specifiers"));
10239 else if (specs
->typespec_word
== cts_floatn_nx
)
10241 ("both %<_Sat%> and %<_Float%d%s%> in "
10242 "declaration specifiers"),
10243 floatn_nx_types
[specs
->floatn_nx_idx
].n
,
10244 (floatn_nx_types
[specs
->floatn_nx_idx
].extended
10247 else if (specs
->typespec_word
== cts_dfloat32
)
10249 ("both %<_Sat%> and %<_Decimal32%> in "
10250 "declaration specifiers"));
10251 else if (specs
->typespec_word
== cts_dfloat64
)
10253 ("both %<_Sat%> and %<_Decimal64%> in "
10254 "declaration specifiers"));
10255 else if (specs
->typespec_word
== cts_dfloat128
)
10257 ("both %<_Sat%> and %<_Decimal128%> in "
10258 "declaration specifiers"));
10259 else if (specs
->complex_p
)
10261 ("both %<_Sat%> and %<complex%> in "
10262 "declaration specifiers"));
10265 specs
->saturating_p
= true;
10266 specs
->locations
[cdw_saturating
] = loc
;
10270 gcc_unreachable ();
10274 error_at (loc
, "duplicate %qE", type
);
10280 /* "void", "_Bool", "char", "int", "float", "double",
10281 "_FloatN", "_FloatNx", "_Decimal32", "__intN",
10282 "_Decimal64", "_Decimal128", "_Fract", "_Accum" or
10284 if (specs
->typespec_word
!= cts_none
)
10287 "two or more data types in declaration specifiers");
10292 case RID_AUTO_TYPE
:
10295 ("both %<long%> and %<__auto_type%> in "
10296 "declaration specifiers"));
10297 else if (specs
->short_p
)
10299 ("both %<short%> and %<__auto_type%> in "
10300 "declaration specifiers"));
10301 else if (specs
->signed_p
)
10303 ("both %<signed%> and %<__auto_type%> in "
10304 "declaration specifiers"));
10305 else if (specs
->unsigned_p
)
10307 ("both %<unsigned%> and %<__auto_type%> in "
10308 "declaration specifiers"));
10309 else if (specs
->complex_p
)
10311 ("both %<complex%> and %<__auto_type%> in "
10312 "declaration specifiers"));
10313 else if (specs
->saturating_p
)
10315 ("both %<_Sat%> and %<__auto_type%> in "
10316 "declaration specifiers"));
10319 specs
->typespec_word
= cts_auto_type
;
10320 specs
->locations
[cdw_typespec
] = loc
;
10327 specs
->int_n_idx
= i
- RID_INT_N_0
;
10328 if (!in_system_header_at (input_location
))
10329 pedwarn (loc
, OPT_Wpedantic
,
10330 "ISO C does not support %<__int%d%> types",
10331 int_n_data
[specs
->int_n_idx
].bitsize
);
10335 ("both %<__int%d%> and %<long%> in "
10336 "declaration specifiers"),
10337 int_n_data
[specs
->int_n_idx
].bitsize
);
10338 else if (specs
->saturating_p
)
10340 ("both %<_Sat%> and %<__int%d%> in "
10341 "declaration specifiers"),
10342 int_n_data
[specs
->int_n_idx
].bitsize
);
10343 else if (specs
->short_p
)
10345 ("both %<__int%d%> and %<short%> in "
10346 "declaration specifiers"),
10347 int_n_data
[specs
->int_n_idx
].bitsize
);
10348 else if (! int_n_enabled_p
[specs
->int_n_idx
])
10350 specs
->typespec_word
= cts_int_n
;
10352 "%<__int%d%> is not supported on this target",
10353 int_n_data
[specs
->int_n_idx
].bitsize
);
10357 specs
->typespec_word
= cts_int_n
;
10358 specs
->locations
[cdw_typespec
] = loc
;
10364 ("both %<long%> and %<void%> in "
10365 "declaration specifiers"));
10366 else if (specs
->short_p
)
10368 ("both %<short%> and %<void%> in "
10369 "declaration specifiers"));
10370 else if (specs
->signed_p
)
10372 ("both %<signed%> and %<void%> in "
10373 "declaration specifiers"));
10374 else if (specs
->unsigned_p
)
10376 ("both %<unsigned%> and %<void%> in "
10377 "declaration specifiers"));
10378 else if (specs
->complex_p
)
10380 ("both %<complex%> and %<void%> in "
10381 "declaration specifiers"));
10382 else if (specs
->saturating_p
)
10384 ("both %<_Sat%> and %<void%> in "
10385 "declaration specifiers"));
10388 specs
->typespec_word
= cts_void
;
10389 specs
->locations
[cdw_typespec
] = loc
;
10393 if (!in_system_header_at (loc
))
10394 pedwarn_c90 (loc
, OPT_Wpedantic
,
10395 "ISO C90 does not support boolean types");
10398 ("both %<long%> and %<_Bool%> in "
10399 "declaration specifiers"));
10400 else if (specs
->short_p
)
10402 ("both %<short%> and %<_Bool%> in "
10403 "declaration specifiers"));
10404 else if (specs
->signed_p
)
10406 ("both %<signed%> and %<_Bool%> in "
10407 "declaration specifiers"));
10408 else if (specs
->unsigned_p
)
10410 ("both %<unsigned%> and %<_Bool%> in "
10411 "declaration specifiers"));
10412 else if (specs
->complex_p
)
10414 ("both %<complex%> and %<_Bool%> in "
10415 "declaration specifiers"));
10416 else if (specs
->saturating_p
)
10418 ("both %<_Sat%> and %<_Bool%> in "
10419 "declaration specifiers"));
10422 specs
->typespec_word
= cts_bool
;
10423 specs
->locations
[cdw_typespec
] = loc
;
10429 ("both %<long%> and %<char%> in "
10430 "declaration specifiers"));
10431 else if (specs
->short_p
)
10433 ("both %<short%> and %<char%> in "
10434 "declaration specifiers"));
10435 else if (specs
->saturating_p
)
10437 ("both %<_Sat%> and %<char%> in "
10438 "declaration specifiers"));
10441 specs
->typespec_word
= cts_char
;
10442 specs
->locations
[cdw_typespec
] = loc
;
10446 if (specs
->saturating_p
)
10448 ("both %<_Sat%> and %<int%> in "
10449 "declaration specifiers"));
10452 specs
->typespec_word
= cts_int
;
10453 specs
->locations
[cdw_typespec
] = loc
;
10459 ("both %<long%> and %<float%> in "
10460 "declaration specifiers"));
10461 else if (specs
->short_p
)
10463 ("both %<short%> and %<float%> in "
10464 "declaration specifiers"));
10465 else if (specs
->signed_p
)
10467 ("both %<signed%> and %<float%> in "
10468 "declaration specifiers"));
10469 else if (specs
->unsigned_p
)
10471 ("both %<unsigned%> and %<float%> in "
10472 "declaration specifiers"));
10473 else if (specs
->saturating_p
)
10475 ("both %<_Sat%> and %<float%> in "
10476 "declaration specifiers"));
10479 specs
->typespec_word
= cts_float
;
10480 specs
->locations
[cdw_typespec
] = loc
;
10484 if (specs
->long_long_p
)
10486 ("both %<long long%> and %<double%> in "
10487 "declaration specifiers"));
10488 else if (specs
->short_p
)
10490 ("both %<short%> and %<double%> in "
10491 "declaration specifiers"));
10492 else if (specs
->signed_p
)
10494 ("both %<signed%> and %<double%> in "
10495 "declaration specifiers"));
10496 else if (specs
->unsigned_p
)
10498 ("both %<unsigned%> and %<double%> in "
10499 "declaration specifiers"));
10500 else if (specs
->saturating_p
)
10502 ("both %<_Sat%> and %<double%> in "
10503 "declaration specifiers"));
10506 specs
->typespec_word
= cts_double
;
10507 specs
->locations
[cdw_typespec
] = loc
;
10510 CASE_RID_FLOATN_NX
:
10511 specs
->floatn_nx_idx
= i
- RID_FLOATN_NX_FIRST
;
10512 if (!in_system_header_at (input_location
))
10513 pedwarn (loc
, OPT_Wpedantic
,
10514 "ISO C does not support the %<_Float%d%s%> type",
10515 floatn_nx_types
[specs
->floatn_nx_idx
].n
,
10516 (floatn_nx_types
[specs
->floatn_nx_idx
].extended
10522 ("both %<long%> and %<_Float%d%s%> in "
10523 "declaration specifiers"),
10524 floatn_nx_types
[specs
->floatn_nx_idx
].n
,
10525 (floatn_nx_types
[specs
->floatn_nx_idx
].extended
10528 else if (specs
->short_p
)
10530 ("both %<short%> and %<_Float%d%s%> in "
10531 "declaration specifiers"),
10532 floatn_nx_types
[specs
->floatn_nx_idx
].n
,
10533 (floatn_nx_types
[specs
->floatn_nx_idx
].extended
10536 else if (specs
->signed_p
)
10538 ("both %<signed%> and %<_Float%d%s%> in "
10539 "declaration specifiers"),
10540 floatn_nx_types
[specs
->floatn_nx_idx
].n
,
10541 (floatn_nx_types
[specs
->floatn_nx_idx
].extended
10544 else if (specs
->unsigned_p
)
10546 ("both %<unsigned%> and %<_Float%d%s%> in "
10547 "declaration specifiers"),
10548 floatn_nx_types
[specs
->floatn_nx_idx
].n
,
10549 (floatn_nx_types
[specs
->floatn_nx_idx
].extended
10552 else if (specs
->saturating_p
)
10554 ("both %<_Sat%> and %<_Float%d%s%> in "
10555 "declaration specifiers"),
10556 floatn_nx_types
[specs
->floatn_nx_idx
].n
,
10557 (floatn_nx_types
[specs
->floatn_nx_idx
].extended
10560 else if (FLOATN_NX_TYPE_NODE (specs
->floatn_nx_idx
) == NULL_TREE
)
10562 specs
->typespec_word
= cts_floatn_nx
;
10564 "%<_Float%d%s%> is not supported on this target",
10565 floatn_nx_types
[specs
->floatn_nx_idx
].n
,
10566 (floatn_nx_types
[specs
->floatn_nx_idx
].extended
10572 specs
->typespec_word
= cts_floatn_nx
;
10573 specs
->locations
[cdw_typespec
] = loc
;
10578 case RID_DFLOAT128
:
10581 if (i
== RID_DFLOAT32
)
10582 str
= "_Decimal32";
10583 else if (i
== RID_DFLOAT64
)
10584 str
= "_Decimal64";
10586 str
= "_Decimal128";
10587 if (specs
->long_long_p
)
10589 ("both %<long long%> and %qs in "
10590 "declaration specifiers"),
10594 ("both %<long%> and %qs in "
10595 "declaration specifiers"),
10597 else if (specs
->short_p
)
10599 ("both %<short%> and %qs in "
10600 "declaration specifiers"),
10602 else if (specs
->signed_p
)
10604 ("both %<signed%> and %qs in "
10605 "declaration specifiers"),
10607 else if (specs
->unsigned_p
)
10609 ("both %<unsigned%> and %qs in "
10610 "declaration specifiers"),
10612 else if (specs
->complex_p
)
10614 ("both %<complex%> and %qs in "
10615 "declaration specifiers"),
10617 else if (specs
->saturating_p
)
10619 ("both %<_Sat%> and %qs in "
10620 "declaration specifiers"),
10622 else if (i
== RID_DFLOAT32
)
10623 specs
->typespec_word
= cts_dfloat32
;
10624 else if (i
== RID_DFLOAT64
)
10625 specs
->typespec_word
= cts_dfloat64
;
10627 specs
->typespec_word
= cts_dfloat128
;
10628 specs
->locations
[cdw_typespec
] = loc
;
10630 if (!targetm
.decimal_float_supported_p ())
10632 ("decimal floating point not supported "
10633 "for this target"));
10634 pedwarn (loc
, OPT_Wpedantic
,
10635 "ISO C does not support decimal floating point");
10641 if (i
== RID_FRACT
)
10645 if (specs
->complex_p
)
10647 ("both %<complex%> and %qs in "
10648 "declaration specifiers"),
10650 else if (i
== RID_FRACT
)
10651 specs
->typespec_word
= cts_fract
;
10653 specs
->typespec_word
= cts_accum
;
10654 specs
->locations
[cdw_typespec
] = loc
;
10656 if (!targetm
.fixed_point_supported_p ())
10658 "fixed-point types not supported for this target");
10659 pedwarn (loc
, OPT_Wpedantic
,
10660 "ISO C does not support fixed-point types");
10663 /* ObjC reserved word "id", handled below. */
10669 /* Now we have a typedef (a TYPE_DECL node), an identifier (some
10670 form of ObjC type, cases such as "int" and "long" being handled
10671 above), a TYPE (struct, union, enum and typeof specifiers) or an
10672 ERROR_MARK. In none of these cases may there have previously
10673 been any type specifiers. */
10674 if (specs
->type
|| specs
->typespec_word
!= cts_none
10675 || specs
->long_p
|| specs
->short_p
|| specs
->signed_p
10676 || specs
->unsigned_p
|| specs
->complex_p
)
10677 error_at (loc
, "two or more data types in declaration specifiers");
10678 else if (TREE_CODE (type
) == TYPE_DECL
)
10680 if (TREE_TYPE (type
) == error_mark_node
)
10681 ; /* Allow the type to default to int to avoid cascading errors. */
10684 specs
->type
= TREE_TYPE (type
);
10685 specs
->decl_attr
= DECL_ATTRIBUTES (type
);
10686 specs
->typedef_p
= true;
10687 specs
->explicit_signed_p
= C_TYPEDEF_EXPLICITLY_SIGNED (type
);
10688 specs
->locations
[cdw_typedef
] = loc
;
10690 /* If this typedef name is defined in a struct, then a C++
10691 lookup would return a different value. */
10692 if (warn_cxx_compat
10693 && I_SYMBOL_BINDING (DECL_NAME (type
))->in_struct
)
10694 warning_at (loc
, OPT_Wc___compat
,
10695 "C++ lookup of %qD would return a field, not a type",
10698 /* If we are parsing a struct, record that a struct field
10700 if (warn_cxx_compat
&& struct_parse_info
!= NULL
)
10701 struct_parse_info
->typedefs_seen
.safe_push (type
);
10704 else if (TREE_CODE (type
) == IDENTIFIER_NODE
)
10706 tree t
= lookup_name (type
);
10707 if (!t
|| TREE_CODE (t
) != TYPE_DECL
)
10708 error_at (loc
, "%qE fails to be a typedef or built in type", type
);
10709 else if (TREE_TYPE (t
) == error_mark_node
)
10713 specs
->type
= TREE_TYPE (t
);
10714 specs
->locations
[cdw_typespec
] = loc
;
10719 if (TREE_CODE (type
) != ERROR_MARK
&& spec
.kind
== ctsk_typeof
)
10721 specs
->typedef_p
= true;
10722 specs
->locations
[cdw_typedef
] = loc
;
10726 specs
->expr
= build2 (COMPOUND_EXPR
, TREE_TYPE (spec
.expr
),
10727 specs
->expr
, spec
.expr
);
10729 specs
->expr
= spec
.expr
;
10730 specs
->expr_const_operands
&= spec
.expr_const_operands
;
10733 specs
->type
= type
;
10739 /* Add the storage class specifier or function specifier SCSPEC to the
10740 declaration specifiers SPECS, returning SPECS. */
10742 struct c_declspecs
*
10743 declspecs_add_scspec (source_location loc
,
10744 struct c_declspecs
*specs
,
10748 enum c_storage_class n
= csc_none
;
10750 specs
->declspecs_seen_p
= true;
10751 gcc_assert (TREE_CODE (scspec
) == IDENTIFIER_NODE
10752 && C_IS_RESERVED_WORD (scspec
));
10753 i
= C_RID_CODE (scspec
);
10754 if (specs
->non_sc_seen_p
)
10755 warning (OPT_Wold_style_declaration
,
10756 "%qE is not at beginning of declaration", scspec
);
10760 /* C99 permits duplicate inline. Although of doubtful utility,
10761 it seems simplest to permit it in gnu89 mode as well, as
10762 there is also little utility in maintaining this as a
10763 difference between gnu89 and C99 inline. */
10765 specs
->inline_p
= true;
10766 specs
->locations
[cdw_inline
] = loc
;
10769 /* Duplicate _Noreturn is permitted. */
10771 specs
->noreturn_p
= true;
10772 specs
->locations
[cdw_noreturn
] = loc
;
10775 dupe
= specs
->thread_p
;
10776 if (specs
->storage_class
== csc_auto
)
10777 error ("%qE used with %<auto%>", scspec
);
10778 else if (specs
->storage_class
== csc_register
)
10779 error ("%qE used with %<register%>", scspec
);
10780 else if (specs
->storage_class
== csc_typedef
)
10781 error ("%qE used with %<typedef%>", scspec
);
10784 specs
->thread_p
= true;
10785 specs
->thread_gnu_p
= (strcmp (IDENTIFIER_POINTER (scspec
),
10787 /* A diagnostic is not required for the use of this
10788 identifier in the implementation namespace; only diagnose
10789 it for the C11 spelling because of existing code using
10790 the other spelling. */
10791 if (!specs
->thread_gnu_p
)
10794 pedwarn_c99 (loc
, OPT_Wpedantic
,
10795 "ISO C99 does not support %qE", scspec
);
10797 pedwarn_c99 (loc
, OPT_Wpedantic
,
10798 "ISO C90 does not support %qE", scspec
);
10800 specs
->locations
[cdw_thread
] = loc
;
10808 /* Diagnose "__thread extern". */
10809 if (specs
->thread_p
&& specs
->thread_gnu_p
)
10810 error ("%<__thread%> before %<extern%>");
10817 /* Diagnose "__thread static". */
10818 if (specs
->thread_p
&& specs
->thread_gnu_p
)
10819 error ("%<__thread%> before %<static%>");
10825 gcc_unreachable ();
10827 if (n
!= csc_none
&& n
== specs
->storage_class
)
10831 if (i
== RID_THREAD
)
10832 error ("duplicate %<_Thread_local%> or %<__thread%>");
10834 error ("duplicate %qE", scspec
);
10838 if (specs
->storage_class
!= csc_none
&& n
!= specs
->storage_class
)
10840 error ("multiple storage classes in declaration specifiers");
10844 specs
->storage_class
= n
;
10845 specs
->locations
[cdw_storage_class
] = loc
;
10846 if (n
!= csc_extern
&& n
!= csc_static
&& specs
->thread_p
)
10848 error ("%qs used with %qE",
10849 specs
->thread_gnu_p
? "__thread" : "_Thread_local",
10851 specs
->thread_p
= false;
10858 /* Add the attributes ATTRS to the declaration specifiers SPECS,
10859 returning SPECS. */
10861 struct c_declspecs
*
10862 declspecs_add_attrs (source_location loc
, struct c_declspecs
*specs
, tree attrs
)
10864 specs
->attrs
= chainon (attrs
, specs
->attrs
);
10865 specs
->locations
[cdw_attributes
] = loc
;
10866 specs
->declspecs_seen_p
= true;
10870 /* Add an _Alignas specifier (expression ALIGN, or type whose
10871 alignment is ALIGN) to the declaration specifiers SPECS, returning
10873 struct c_declspecs
*
10874 declspecs_add_alignas (source_location loc
,
10875 struct c_declspecs
*specs
, tree align
)
10878 specs
->alignas_p
= true;
10879 specs
->locations
[cdw_alignas
] = loc
;
10880 if (align
== error_mark_node
)
10882 align_log
= check_user_alignment (align
, true);
10883 if (align_log
> specs
->align_log
)
10884 specs
->align_log
= align_log
;
10888 /* Combine "long", "short", "signed", "unsigned" and "_Complex" type
10889 specifiers with any other type specifier to determine the resulting
10890 type. This is where ISO C checks on complex types are made, since
10891 "_Complex long" is a prefix of the valid ISO C type "_Complex long
10894 struct c_declspecs
*
10895 finish_declspecs (struct c_declspecs
*specs
)
10897 /* If a type was specified as a whole, we have no modifiers and are
10899 if (specs
->type
!= NULL_TREE
)
10901 gcc_assert (!specs
->long_p
&& !specs
->long_long_p
&& !specs
->short_p
10902 && !specs
->signed_p
&& !specs
->unsigned_p
10903 && !specs
->complex_p
);
10905 /* Set a dummy type. */
10906 if (TREE_CODE (specs
->type
) == ERROR_MARK
)
10907 specs
->type
= integer_type_node
;
10911 /* If none of "void", "_Bool", "char", "int", "float" or "double"
10912 has been specified, treat it as "int" unless "_Complex" is
10913 present and there are no other specifiers. If we just have
10914 "_Complex", it is equivalent to "_Complex double", but e.g.
10915 "_Complex short" is equivalent to "_Complex short int". */
10916 if (specs
->typespec_word
== cts_none
)
10918 if (specs
->saturating_p
)
10920 error_at (specs
->locations
[cdw_saturating
],
10921 "%<_Sat%> is used without %<_Fract%> or %<_Accum%>");
10922 if (!targetm
.fixed_point_supported_p ())
10923 error_at (specs
->locations
[cdw_saturating
],
10924 "fixed-point types not supported for this target");
10925 specs
->typespec_word
= cts_fract
;
10927 else if (specs
->long_p
|| specs
->short_p
10928 || specs
->signed_p
|| specs
->unsigned_p
)
10930 specs
->typespec_word
= cts_int
;
10932 else if (specs
->complex_p
)
10934 specs
->typespec_word
= cts_double
;
10935 pedwarn (specs
->locations
[cdw_complex
], OPT_Wpedantic
,
10936 "ISO C does not support plain %<complex%> meaning "
10937 "%<double complex%>");
10941 specs
->typespec_word
= cts_int
;
10942 specs
->default_int_p
= true;
10943 /* We don't diagnose this here because grokdeclarator will
10944 give more specific diagnostics according to whether it is
10945 a function definition. */
10949 /* If "signed" was specified, record this to distinguish "int" and
10950 "signed int" in the case of a bit-field with
10951 -funsigned-bitfields. */
10952 specs
->explicit_signed_p
= specs
->signed_p
;
10954 /* Now compute the actual type. */
10955 switch (specs
->typespec_word
)
10957 case cts_auto_type
:
10958 gcc_assert (!specs
->long_p
&& !specs
->short_p
10959 && !specs
->signed_p
&& !specs
->unsigned_p
10960 && !specs
->complex_p
);
10961 /* Type to be filled in later. */
10964 gcc_assert (!specs
->long_p
&& !specs
->short_p
10965 && !specs
->signed_p
&& !specs
->unsigned_p
10966 && !specs
->complex_p
);
10967 specs
->type
= void_type_node
;
10970 gcc_assert (!specs
->long_p
&& !specs
->short_p
10971 && !specs
->signed_p
&& !specs
->unsigned_p
10972 && !specs
->complex_p
);
10973 specs
->type
= boolean_type_node
;
10976 gcc_assert (!specs
->long_p
&& !specs
->short_p
);
10977 gcc_assert (!(specs
->signed_p
&& specs
->unsigned_p
));
10978 if (specs
->signed_p
)
10979 specs
->type
= signed_char_type_node
;
10980 else if (specs
->unsigned_p
)
10981 specs
->type
= unsigned_char_type_node
;
10983 specs
->type
= char_type_node
;
10984 if (specs
->complex_p
)
10986 pedwarn (specs
->locations
[cdw_complex
], OPT_Wpedantic
,
10987 "ISO C does not support complex integer types");
10988 specs
->type
= build_complex_type (specs
->type
);
10992 gcc_assert (!specs
->long_p
&& !specs
->short_p
&& !specs
->long_long_p
);
10993 gcc_assert (!(specs
->signed_p
&& specs
->unsigned_p
));
10994 if (! int_n_enabled_p
[specs
->int_n_idx
])
10995 specs
->type
= integer_type_node
;
10997 specs
->type
= (specs
->unsigned_p
10998 ? int_n_trees
[specs
->int_n_idx
].unsigned_type
10999 : int_n_trees
[specs
->int_n_idx
].signed_type
);
11000 if (specs
->complex_p
)
11002 pedwarn (specs
->locations
[cdw_complex
], OPT_Wpedantic
,
11003 "ISO C does not support complex integer types");
11004 specs
->type
= build_complex_type (specs
->type
);
11008 gcc_assert (!(specs
->long_p
&& specs
->short_p
));
11009 gcc_assert (!(specs
->signed_p
&& specs
->unsigned_p
));
11010 if (specs
->long_long_p
)
11011 specs
->type
= (specs
->unsigned_p
11012 ? long_long_unsigned_type_node
11013 : long_long_integer_type_node
);
11014 else if (specs
->long_p
)
11015 specs
->type
= (specs
->unsigned_p
11016 ? long_unsigned_type_node
11017 : long_integer_type_node
);
11018 else if (specs
->short_p
)
11019 specs
->type
= (specs
->unsigned_p
11020 ? short_unsigned_type_node
11021 : short_integer_type_node
);
11023 specs
->type
= (specs
->unsigned_p
11024 ? unsigned_type_node
11025 : integer_type_node
);
11026 if (specs
->complex_p
)
11028 pedwarn (specs
->locations
[cdw_complex
], OPT_Wpedantic
,
11029 "ISO C does not support complex integer types");
11030 specs
->type
= build_complex_type (specs
->type
);
11034 gcc_assert (!specs
->long_p
&& !specs
->short_p
11035 && !specs
->signed_p
&& !specs
->unsigned_p
);
11036 specs
->type
= (specs
->complex_p
11037 ? complex_float_type_node
11038 : float_type_node
);
11041 gcc_assert (!specs
->long_long_p
&& !specs
->short_p
11042 && !specs
->signed_p
&& !specs
->unsigned_p
);
11045 specs
->type
= (specs
->complex_p
11046 ? complex_long_double_type_node
11047 : long_double_type_node
);
11051 specs
->type
= (specs
->complex_p
11052 ? complex_double_type_node
11053 : double_type_node
);
11056 case cts_floatn_nx
:
11057 gcc_assert (!specs
->long_p
&& !specs
->short_p
11058 && !specs
->signed_p
&& !specs
->unsigned_p
);
11059 if (FLOATN_NX_TYPE_NODE (specs
->floatn_nx_idx
) == NULL_TREE
)
11060 specs
->type
= integer_type_node
;
11061 else if (specs
->complex_p
)
11062 specs
->type
= COMPLEX_FLOATN_NX_TYPE_NODE (specs
->floatn_nx_idx
);
11064 specs
->type
= FLOATN_NX_TYPE_NODE (specs
->floatn_nx_idx
);
11068 case cts_dfloat128
:
11069 gcc_assert (!specs
->long_p
&& !specs
->long_long_p
&& !specs
->short_p
11070 && !specs
->signed_p
&& !specs
->unsigned_p
&& !specs
->complex_p
);
11071 if (specs
->typespec_word
== cts_dfloat32
)
11072 specs
->type
= dfloat32_type_node
;
11073 else if (specs
->typespec_word
== cts_dfloat64
)
11074 specs
->type
= dfloat64_type_node
;
11076 specs
->type
= dfloat128_type_node
;
11079 gcc_assert (!specs
->complex_p
);
11080 if (!targetm
.fixed_point_supported_p ())
11081 specs
->type
= integer_type_node
;
11082 else if (specs
->saturating_p
)
11084 if (specs
->long_long_p
)
11085 specs
->type
= specs
->unsigned_p
11086 ? sat_unsigned_long_long_fract_type_node
11087 : sat_long_long_fract_type_node
;
11088 else if (specs
->long_p
)
11089 specs
->type
= specs
->unsigned_p
11090 ? sat_unsigned_long_fract_type_node
11091 : sat_long_fract_type_node
;
11092 else if (specs
->short_p
)
11093 specs
->type
= specs
->unsigned_p
11094 ? sat_unsigned_short_fract_type_node
11095 : sat_short_fract_type_node
;
11097 specs
->type
= specs
->unsigned_p
11098 ? sat_unsigned_fract_type_node
11099 : sat_fract_type_node
;
11103 if (specs
->long_long_p
)
11104 specs
->type
= specs
->unsigned_p
11105 ? unsigned_long_long_fract_type_node
11106 : long_long_fract_type_node
;
11107 else if (specs
->long_p
)
11108 specs
->type
= specs
->unsigned_p
11109 ? unsigned_long_fract_type_node
11110 : long_fract_type_node
;
11111 else if (specs
->short_p
)
11112 specs
->type
= specs
->unsigned_p
11113 ? unsigned_short_fract_type_node
11114 : short_fract_type_node
;
11116 specs
->type
= specs
->unsigned_p
11117 ? unsigned_fract_type_node
11122 gcc_assert (!specs
->complex_p
);
11123 if (!targetm
.fixed_point_supported_p ())
11124 specs
->type
= integer_type_node
;
11125 else if (specs
->saturating_p
)
11127 if (specs
->long_long_p
)
11128 specs
->type
= specs
->unsigned_p
11129 ? sat_unsigned_long_long_accum_type_node
11130 : sat_long_long_accum_type_node
;
11131 else if (specs
->long_p
)
11132 specs
->type
= specs
->unsigned_p
11133 ? sat_unsigned_long_accum_type_node
11134 : sat_long_accum_type_node
;
11135 else if (specs
->short_p
)
11136 specs
->type
= specs
->unsigned_p
11137 ? sat_unsigned_short_accum_type_node
11138 : sat_short_accum_type_node
;
11140 specs
->type
= specs
->unsigned_p
11141 ? sat_unsigned_accum_type_node
11142 : sat_accum_type_node
;
11146 if (specs
->long_long_p
)
11147 specs
->type
= specs
->unsigned_p
11148 ? unsigned_long_long_accum_type_node
11149 : long_long_accum_type_node
;
11150 else if (specs
->long_p
)
11151 specs
->type
= specs
->unsigned_p
11152 ? unsigned_long_accum_type_node
11153 : long_accum_type_node
;
11154 else if (specs
->short_p
)
11155 specs
->type
= specs
->unsigned_p
11156 ? unsigned_short_accum_type_node
11157 : short_accum_type_node
;
11159 specs
->type
= specs
->unsigned_p
11160 ? unsigned_accum_type_node
11165 gcc_unreachable ();
11171 /* Perform final processing on one file scope's declarations (or the
11172 external scope's declarations), GLOBALS. */
11175 c_write_global_declarations_1 (tree globals
)
11180 /* Process the decls in the order they were written. */
11181 for (decl
= globals
; decl
; decl
= DECL_CHAIN (decl
))
11183 /* Check for used but undefined static functions using the C
11184 standard's definition of "used", and set TREE_NO_WARNING so
11185 that check_global_declaration doesn't repeat the check. */
11186 if (TREE_CODE (decl
) == FUNCTION_DECL
11187 && DECL_INITIAL (decl
) == NULL_TREE
11188 && DECL_EXTERNAL (decl
)
11189 && !TREE_PUBLIC (decl
))
11191 if (C_DECL_USED (decl
))
11193 pedwarn (input_location
, 0, "%q+F used but never defined", decl
);
11194 TREE_NO_WARNING (decl
) = 1;
11196 /* For -Wunused-function warn about unused static prototypes. */
11197 else if (warn_unused_function
11198 && ! DECL_ARTIFICIAL (decl
)
11199 && ! TREE_NO_WARNING (decl
))
11201 warning (OPT_Wunused_function
,
11202 "%q+F declared %<static%> but never defined", decl
);
11203 TREE_NO_WARNING (decl
) = 1;
11207 wrapup_global_declaration_1 (decl
);
11212 reconsider
= false;
11213 for (decl
= globals
; decl
; decl
= DECL_CHAIN (decl
))
11214 reconsider
|= wrapup_global_declaration_2 (decl
);
11216 while (reconsider
);
11219 /* Callback to collect a source_ref from a DECL. */
11222 collect_source_ref_cb (tree decl
)
11224 if (!DECL_IS_BUILTIN (decl
))
11225 collect_source_ref (LOCATION_FILE (decl_sloc (decl
, false)));
11228 /* Preserve the external declarations scope across a garbage collect. */
11229 static GTY(()) tree ext_block
;
11231 /* Collect all references relevant to SOURCE_FILE. */
11234 collect_all_refs (const char *source_file
)
11239 FOR_EACH_VEC_ELT (*all_translation_units
, i
, t
)
11240 collect_ada_nodes (BLOCK_VARS (DECL_INITIAL (t
)), source_file
);
11242 collect_ada_nodes (BLOCK_VARS (ext_block
), source_file
);
11245 /* Iterate over all global declarations and call CALLBACK. */
11248 for_each_global_decl (void (*callback
) (tree decl
))
11255 FOR_EACH_VEC_ELT (*all_translation_units
, i
, t
)
11257 decls
= DECL_INITIAL (t
);
11258 for (decl
= BLOCK_VARS (decls
); decl
; decl
= TREE_CHAIN (decl
))
11262 for (decl
= BLOCK_VARS (ext_block
); decl
; decl
= TREE_CHAIN (decl
))
11266 /* Perform any final parser cleanups and generate initial debugging
11270 c_parse_final_cleanups (void)
11275 /* We don't want to do this if generating a PCH. */
11279 timevar_stop (TV_PHASE_PARSING
);
11280 timevar_start (TV_PHASE_DEFERRED
);
11282 /* Do the Objective-C stuff. This is where all the Objective-C
11283 module stuff gets generated (symtab, class/protocol/selector
11285 if (c_dialect_objc ())
11286 objc_write_global_declarations ();
11288 /* Close the external scope. */
11289 ext_block
= pop_scope ();
11290 external_scope
= 0;
11291 gcc_assert (!current_scope
);
11293 /* Handle -fdump-ada-spec[-slim]. */
11294 if (flag_dump_ada_spec
|| flag_dump_ada_spec_slim
)
11296 /* Build a table of files to generate specs for */
11297 if (flag_dump_ada_spec_slim
)
11298 collect_source_ref (main_input_filename
);
11300 for_each_global_decl (collect_source_ref_cb
);
11302 dump_ada_specs (collect_all_refs
, NULL
);
11305 /* Process all file scopes in this compilation, and the external_scope,
11306 through wrapup_global_declarations. */
11307 FOR_EACH_VEC_ELT (*all_translation_units
, i
, t
)
11308 c_write_global_declarations_1 (BLOCK_VARS (DECL_INITIAL (t
)));
11309 c_write_global_declarations_1 (BLOCK_VARS (ext_block
));
11311 timevar_stop (TV_PHASE_DEFERRED
);
11312 timevar_start (TV_PHASE_PARSING
);
11317 /* Register reserved keyword WORD as qualifier for address space AS. */
11320 c_register_addr_space (const char *word
, addr_space_t as
)
11322 int rid
= RID_FIRST_ADDR_SPACE
+ as
;
11325 /* Address space qualifiers are only supported
11326 in C with GNU extensions enabled. */
11327 if (c_dialect_objc () || flag_no_asm
)
11330 id
= get_identifier (word
);
11331 C_SET_RID_CODE (id
, rid
);
11332 C_IS_RESERVED_WORD (id
) = 1;
11333 ridpointers
[rid
] = id
;
11336 /* Return identifier to look up for omp declare reduction. */
11339 c_omp_reduction_id (enum tree_code reduction_code
, tree reduction_id
)
11341 const char *p
= NULL
;
11342 switch (reduction_code
)
11344 case PLUS_EXPR
: p
= "+"; break;
11345 case MULT_EXPR
: p
= "*"; break;
11346 case MINUS_EXPR
: p
= "-"; break;
11347 case BIT_AND_EXPR
: p
= "&"; break;
11348 case BIT_XOR_EXPR
: p
= "^"; break;
11349 case BIT_IOR_EXPR
: p
= "|"; break;
11350 case TRUTH_ANDIF_EXPR
: p
= "&&"; break;
11351 case TRUTH_ORIF_EXPR
: p
= "||"; break;
11352 case MIN_EXPR
: p
= "min"; break;
11353 case MAX_EXPR
: p
= "max"; break;
11360 if (TREE_CODE (reduction_id
) != IDENTIFIER_NODE
)
11361 return error_mark_node
;
11362 p
= IDENTIFIER_POINTER (reduction_id
);
11365 const char prefix
[] = "omp declare reduction ";
11366 size_t lenp
= sizeof (prefix
);
11367 size_t len
= strlen (p
);
11368 char *name
= XALLOCAVEC (char, lenp
+ len
);
11369 memcpy (name
, prefix
, lenp
- 1);
11370 memcpy (name
+ lenp
- 1, p
, len
+ 1);
11371 return get_identifier (name
);
11374 /* Lookup REDUCTION_ID in the current scope, or create an artificial
11375 VAR_DECL, bind it into the current scope and return it. */
11378 c_omp_reduction_decl (tree reduction_id
)
11380 struct c_binding
*b
= I_SYMBOL_BINDING (reduction_id
);
11381 if (b
!= NULL
&& B_IN_CURRENT_SCOPE (b
))
11384 tree decl
= build_decl (BUILTINS_LOCATION
, VAR_DECL
,
11385 reduction_id
, integer_type_node
);
11386 DECL_ARTIFICIAL (decl
) = 1;
11387 DECL_EXTERNAL (decl
) = 1;
11388 TREE_STATIC (decl
) = 1;
11389 TREE_PUBLIC (decl
) = 0;
11390 bind (reduction_id
, decl
, current_scope
, true, false, BUILTINS_LOCATION
);
11394 /* Lookup REDUCTION_ID in the first scope where it has entry for TYPE. */
11397 c_omp_reduction_lookup (tree reduction_id
, tree type
)
11399 struct c_binding
*b
= I_SYMBOL_BINDING (reduction_id
);
11403 for (t
= DECL_INITIAL (b
->decl
); t
; t
= TREE_CHAIN (t
))
11404 if (comptypes (TREE_PURPOSE (t
), type
))
11405 return TREE_VALUE (t
);
11408 return error_mark_node
;
11411 /* Helper function called via walk_tree, to diagnose invalid
11412 #pragma omp declare reduction combiners or initializers. */
11415 c_check_omp_declare_reduction_r (tree
*tp
, int *, void *data
)
11417 tree
*vars
= (tree
*) data
;
11418 if (SSA_VAR_P (*tp
)
11419 && !DECL_ARTIFICIAL (*tp
)
11423 location_t loc
= DECL_SOURCE_LOCATION (vars
[0]);
11424 if (strcmp (IDENTIFIER_POINTER (DECL_NAME (vars
[0])), "omp_out") == 0)
11425 error_at (loc
, "%<#pragma omp declare reduction%> combiner refers to "
11426 "variable %qD which is not %<omp_out%> nor %<omp_in%>",
11429 error_at (loc
, "%<#pragma omp declare reduction%> initializer refers "
11430 "to variable %qD which is not %<omp_priv%> nor "
11438 #include "gt-c-c-decl.h"