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 warning_at (loc
, OPT_Wc___compat
,
1561 ("using %qD as both a typedef and a tag is "
1564 if (b
->locus
!= UNKNOWN_LOCATION
)
1565 inform (b
->locus
, "originally defined here");
1570 /* An exported interface to pushtag. This is used by the gdb plugin's
1571 binding oracle to introduce a new tag binding. */
1574 c_pushtag (location_t loc
, tree name
, tree type
)
1576 pushtag (loc
, name
, type
);
1579 /* An exported interface to bind a declaration. LOC is the location
1580 to use. DECL is the declaration to bind. The decl's name is used
1581 to determine how it is bound. If DECL is a VAR_DECL, then
1582 IS_GLOBAL determines whether the decl is put into the global (file
1583 and external) scope or the current function's scope; if DECL is not
1584 a VAR_DECL then it is always put into the file scope. */
1587 c_bind (location_t loc
, tree decl
, bool is_global
)
1589 struct c_scope
*scope
;
1590 bool nested
= false;
1592 if (!VAR_P (decl
) || current_function_scope
== NULL
)
1594 /* Types and functions are always considered to be global. */
1596 DECL_EXTERNAL (decl
) = 1;
1597 TREE_PUBLIC (decl
) = 1;
1601 /* Also bind it into the external scope. */
1602 bind (DECL_NAME (decl
), decl
, external_scope
, true, false, loc
);
1605 DECL_EXTERNAL (decl
) = 1;
1606 TREE_PUBLIC (decl
) = 1;
1610 DECL_CONTEXT (decl
) = current_function_decl
;
1611 TREE_PUBLIC (decl
) = 0;
1612 scope
= current_function_scope
;
1615 bind (DECL_NAME (decl
), decl
, scope
, false, nested
, loc
);
1618 /* Subroutine of compare_decls. Allow harmless mismatches in return
1619 and argument types provided that the type modes match. This function
1620 return a unified type given a suitable match, and 0 otherwise. */
1623 match_builtin_function_types (tree newtype
, tree oldtype
)
1625 tree newrettype
, oldrettype
;
1626 tree newargs
, oldargs
;
1627 tree trytype
, tryargs
;
1629 /* Accept the return type of the new declaration if same modes. */
1630 oldrettype
= TREE_TYPE (oldtype
);
1631 newrettype
= TREE_TYPE (newtype
);
1633 if (TYPE_MODE (oldrettype
) != TYPE_MODE (newrettype
))
1636 oldargs
= TYPE_ARG_TYPES (oldtype
);
1637 newargs
= TYPE_ARG_TYPES (newtype
);
1640 while (oldargs
|| newargs
)
1644 || !TREE_VALUE (oldargs
)
1645 || !TREE_VALUE (newargs
)
1646 || TYPE_MODE (TREE_VALUE (oldargs
))
1647 != TYPE_MODE (TREE_VALUE (newargs
)))
1650 oldargs
= TREE_CHAIN (oldargs
);
1651 newargs
= TREE_CHAIN (newargs
);
1654 trytype
= build_function_type (newrettype
, tryargs
);
1656 /* Allow declaration to change transaction_safe attribute. */
1657 tree oldattrs
= TYPE_ATTRIBUTES (oldtype
);
1658 tree oldtsafe
= lookup_attribute ("transaction_safe", oldattrs
);
1659 tree newattrs
= TYPE_ATTRIBUTES (newtype
);
1660 tree newtsafe
= lookup_attribute ("transaction_safe", newattrs
);
1661 if (oldtsafe
&& !newtsafe
)
1662 oldattrs
= remove_attribute ("transaction_safe", oldattrs
);
1663 else if (newtsafe
&& !oldtsafe
)
1664 oldattrs
= tree_cons (get_identifier ("transaction_safe"),
1665 NULL_TREE
, oldattrs
);
1667 return build_type_attribute_variant (trytype
, oldattrs
);
1670 /* Subroutine of diagnose_mismatched_decls. Check for function type
1671 mismatch involving an empty arglist vs a nonempty one and give clearer
1674 diagnose_arglist_conflict (tree newdecl
, tree olddecl
,
1675 tree newtype
, tree oldtype
)
1679 if (TREE_CODE (olddecl
) != FUNCTION_DECL
1680 || !comptypes (TREE_TYPE (oldtype
), TREE_TYPE (newtype
))
1681 || !((!prototype_p (oldtype
) && DECL_INITIAL (olddecl
) == NULL_TREE
)
1682 || (!prototype_p (newtype
) && DECL_INITIAL (newdecl
) == NULL_TREE
)))
1685 t
= TYPE_ARG_TYPES (oldtype
);
1687 t
= TYPE_ARG_TYPES (newtype
);
1688 for (; t
; t
= TREE_CHAIN (t
))
1690 tree type
= TREE_VALUE (t
);
1692 if (TREE_CHAIN (t
) == NULL_TREE
1693 && TYPE_MAIN_VARIANT (type
) != void_type_node
)
1695 inform (input_location
, "a parameter list with an ellipsis can%'t match "
1696 "an empty parameter name list declaration");
1700 if (c_type_promotes_to (type
) != type
)
1702 inform (input_location
, "an argument type that has a default promotion can%'t match "
1703 "an empty parameter name list declaration");
1709 /* Another subroutine of diagnose_mismatched_decls. OLDDECL is an
1710 old-style function definition, NEWDECL is a prototype declaration.
1711 Diagnose inconsistencies in the argument list. Returns TRUE if
1712 the prototype is compatible, FALSE if not. */
1714 validate_proto_after_old_defn (tree newdecl
, tree newtype
, tree oldtype
)
1716 tree newargs
, oldargs
;
1719 #define END_OF_ARGLIST(t) ((t) == void_type_node)
1721 oldargs
= TYPE_ACTUAL_ARG_TYPES (oldtype
);
1722 newargs
= TYPE_ARG_TYPES (newtype
);
1727 tree oldargtype
= TREE_VALUE (oldargs
);
1728 tree newargtype
= TREE_VALUE (newargs
);
1730 if (oldargtype
== error_mark_node
|| newargtype
== error_mark_node
)
1733 oldargtype
= (TYPE_ATOMIC (oldargtype
)
1734 ? c_build_qualified_type (TYPE_MAIN_VARIANT (oldargtype
),
1736 : TYPE_MAIN_VARIANT (oldargtype
));
1737 newargtype
= (TYPE_ATOMIC (newargtype
)
1738 ? c_build_qualified_type (TYPE_MAIN_VARIANT (newargtype
),
1740 : TYPE_MAIN_VARIANT (newargtype
));
1742 if (END_OF_ARGLIST (oldargtype
) && END_OF_ARGLIST (newargtype
))
1745 /* Reaching the end of just one list means the two decls don't
1746 agree on the number of arguments. */
1747 if (END_OF_ARGLIST (oldargtype
))
1749 error ("prototype for %q+D declares more arguments "
1750 "than previous old-style definition", newdecl
);
1753 else if (END_OF_ARGLIST (newargtype
))
1755 error ("prototype for %q+D declares fewer arguments "
1756 "than previous old-style definition", newdecl
);
1760 /* Type for passing arg must be consistent with that declared
1762 else if (!comptypes (oldargtype
, newargtype
))
1764 error ("prototype for %q+D declares argument %d"
1765 " with incompatible type",
1770 oldargs
= TREE_CHAIN (oldargs
);
1771 newargs
= TREE_CHAIN (newargs
);
1775 /* If we get here, no errors were found, but do issue a warning
1776 for this poor-style construct. */
1777 warning (0, "prototype for %q+D follows non-prototype definition",
1780 #undef END_OF_ARGLIST
1783 /* Subroutine of diagnose_mismatched_decls. Report the location of DECL,
1784 first in a pair of mismatched declarations, using the diagnostic
1787 locate_old_decl (tree decl
)
1789 if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_BUILT_IN (decl
)
1790 && !C_DECL_DECLARED_BUILTIN (decl
))
1792 else if (DECL_INITIAL (decl
))
1793 inform (input_location
, "previous definition of %q+D was here", decl
);
1794 else if (C_DECL_IMPLICIT (decl
))
1795 inform (input_location
, "previous implicit declaration of %q+D was here", decl
);
1797 inform (input_location
, "previous declaration of %q+D was here", decl
);
1800 /* Subroutine of duplicate_decls. Compare NEWDECL to OLDDECL.
1801 Returns true if the caller should proceed to merge the two, false
1802 if OLDDECL should simply be discarded. As a side effect, issues
1803 all necessary diagnostics for invalid or poor-style combinations.
1804 If it returns true, writes the types of NEWDECL and OLDDECL to
1805 *NEWTYPEP and *OLDTYPEP - these may have been adjusted from
1806 TREE_TYPE (NEWDECL, OLDDECL) respectively. */
1809 diagnose_mismatched_decls (tree newdecl
, tree olddecl
,
1810 tree
*newtypep
, tree
*oldtypep
)
1812 tree newtype
, oldtype
;
1813 bool pedwarned
= false;
1814 bool warned
= false;
1817 #define DECL_EXTERN_INLINE(DECL) (DECL_DECLARED_INLINE_P (DECL) \
1818 && DECL_EXTERNAL (DECL))
1820 /* If we have error_mark_node for either decl or type, just discard
1821 the previous decl - we're in an error cascade already. */
1822 if (olddecl
== error_mark_node
|| newdecl
== error_mark_node
)
1824 *oldtypep
= oldtype
= TREE_TYPE (olddecl
);
1825 *newtypep
= newtype
= TREE_TYPE (newdecl
);
1826 if (oldtype
== error_mark_node
|| newtype
== error_mark_node
)
1829 /* Two different categories of symbol altogether. This is an error
1830 unless OLDDECL is a builtin. OLDDECL will be discarded in any case. */
1831 if (TREE_CODE (olddecl
) != TREE_CODE (newdecl
))
1833 if (!(TREE_CODE (olddecl
) == FUNCTION_DECL
1834 && DECL_BUILT_IN (olddecl
)
1835 && !C_DECL_DECLARED_BUILTIN (olddecl
)))
1837 error ("%q+D redeclared as different kind of symbol", newdecl
);
1838 locate_old_decl (olddecl
);
1840 else if (TREE_PUBLIC (newdecl
))
1841 warning (0, "built-in function %q+D declared as non-function",
1844 warning (OPT_Wshadow
, "declaration of %q+D shadows "
1845 "a built-in function", newdecl
);
1849 /* Enumerators have no linkage, so may only be declared once in a
1851 if (TREE_CODE (olddecl
) == CONST_DECL
)
1853 error ("redeclaration of enumerator %q+D", newdecl
);
1854 locate_old_decl (olddecl
);
1858 if (!comptypes (oldtype
, newtype
))
1860 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1861 && DECL_BUILT_IN (olddecl
) && !C_DECL_DECLARED_BUILTIN (olddecl
))
1863 /* Accept harmless mismatch in function types.
1864 This is for the ffs and fprintf builtins. */
1865 tree trytype
= match_builtin_function_types (newtype
, oldtype
);
1867 if (trytype
&& comptypes (newtype
, trytype
))
1868 *oldtypep
= oldtype
= trytype
;
1871 /* If types don't match for a built-in, throw away the
1872 built-in. No point in calling locate_old_decl here, it
1873 won't print anything. */
1874 warning (OPT_Wbuiltin_declaration_mismatch
,
1875 "conflicting types for built-in function %q+D",
1880 else if (TREE_CODE (olddecl
) == FUNCTION_DECL
1881 && DECL_IS_BUILTIN (olddecl
))
1883 /* A conflicting function declaration for a predeclared
1884 function that isn't actually built in. Objective C uses
1885 these. The new declaration silently overrides everything
1886 but the volatility (i.e. noreturn) indication. See also
1887 below. FIXME: Make Objective C use normal builtins. */
1888 TREE_THIS_VOLATILE (newdecl
) |= TREE_THIS_VOLATILE (olddecl
);
1891 /* Permit void foo (...) to match int foo (...) if the latter is
1892 the definition and implicit int was used. See
1893 c-torture/compile/920625-2.c. */
1894 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
&& DECL_INITIAL (newdecl
)
1895 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype
)) == void_type_node
1896 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype
)) == integer_type_node
1897 && C_FUNCTION_IMPLICIT_INT (newdecl
) && !DECL_INITIAL (olddecl
))
1899 pedwarned
= pedwarn (input_location
, 0,
1900 "conflicting types for %q+D", newdecl
);
1901 /* Make sure we keep void as the return type. */
1902 TREE_TYPE (newdecl
) = *newtypep
= newtype
= oldtype
;
1903 C_FUNCTION_IMPLICIT_INT (newdecl
) = 0;
1905 /* Permit void foo (...) to match an earlier call to foo (...) with
1906 no declared type (thus, implicitly int). */
1907 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
1908 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype
)) == void_type_node
1909 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype
)) == integer_type_node
1910 && C_DECL_IMPLICIT (olddecl
) && !DECL_INITIAL (olddecl
))
1912 pedwarned
= pedwarn (input_location
, 0,
1913 "conflicting types for %q+D", newdecl
);
1914 /* Make sure we keep void as the return type. */
1915 TREE_TYPE (olddecl
) = *oldtypep
= oldtype
= newtype
;
1919 int new_quals
= TYPE_QUALS (newtype
);
1920 int old_quals
= TYPE_QUALS (oldtype
);
1922 if (new_quals
!= old_quals
)
1924 addr_space_t new_addr
= DECODE_QUAL_ADDR_SPACE (new_quals
);
1925 addr_space_t old_addr
= DECODE_QUAL_ADDR_SPACE (old_quals
);
1926 if (new_addr
!= old_addr
)
1928 if (ADDR_SPACE_GENERIC_P (new_addr
))
1929 error ("conflicting named address spaces (generic vs %s) "
1931 c_addr_space_name (old_addr
), newdecl
);
1932 else if (ADDR_SPACE_GENERIC_P (old_addr
))
1933 error ("conflicting named address spaces (%s vs generic) "
1935 c_addr_space_name (new_addr
), newdecl
);
1937 error ("conflicting named address spaces (%s vs %s) "
1939 c_addr_space_name (new_addr
),
1940 c_addr_space_name (old_addr
),
1944 if (CLEAR_QUAL_ADDR_SPACE (new_quals
)
1945 != CLEAR_QUAL_ADDR_SPACE (old_quals
))
1946 error ("conflicting type qualifiers for %q+D", newdecl
);
1949 error ("conflicting types for %q+D", newdecl
);
1950 diagnose_arglist_conflict (newdecl
, olddecl
, newtype
, oldtype
);
1951 locate_old_decl (olddecl
);
1956 /* Redeclaration of a type is a constraint violation (6.7.2.3p1),
1957 but silently ignore the redeclaration if either is in a system
1958 header. (Conflicting redeclarations were handled above.) This
1959 is allowed for C11 if the types are the same, not just
1961 if (TREE_CODE (newdecl
) == TYPE_DECL
)
1963 bool types_different
= false;
1964 int comptypes_result
;
1967 = comptypes_check_different_types (oldtype
, newtype
, &types_different
);
1969 if (comptypes_result
!= 1 || types_different
)
1971 error ("redefinition of typedef %q+D with different type", newdecl
);
1972 locate_old_decl (olddecl
);
1976 if (DECL_IN_SYSTEM_HEADER (newdecl
)
1977 || DECL_IN_SYSTEM_HEADER (olddecl
)
1978 || TREE_NO_WARNING (newdecl
)
1979 || TREE_NO_WARNING (olddecl
))
1980 return true; /* Allow OLDDECL to continue in use. */
1982 if (variably_modified_type_p (newtype
, NULL
))
1984 error ("redefinition of typedef %q+D with variably modified type",
1986 locate_old_decl (olddecl
);
1988 else if (pedwarn_c99 (input_location
, OPT_Wpedantic
,
1989 "redefinition of typedef %q+D", newdecl
))
1990 locate_old_decl (olddecl
);
1995 /* Function declarations can either be 'static' or 'extern' (no
1996 qualifier is equivalent to 'extern' - C99 6.2.2p5) and therefore
1997 can never conflict with each other on account of linkage
1998 (6.2.2p4). Multiple definitions are not allowed (6.9p3,5) but
1999 gnu89 mode permits two definitions if one is 'extern inline' and
2000 one is not. The non- extern-inline definition supersedes the
2001 extern-inline definition. */
2003 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2005 /* If you declare a built-in function name as static, or
2006 define the built-in with an old-style definition (so we
2007 can't validate the argument list) the built-in definition is
2008 overridden, but optionally warn this was a bad choice of name. */
2009 if (DECL_BUILT_IN (olddecl
)
2010 && !C_DECL_DECLARED_BUILTIN (olddecl
)
2011 && (!TREE_PUBLIC (newdecl
)
2012 || (DECL_INITIAL (newdecl
)
2013 && !prototype_p (TREE_TYPE (newdecl
)))))
2015 warning (OPT_Wshadow
, "declaration of %q+D shadows "
2016 "a built-in function", newdecl
);
2017 /* Discard the old built-in function. */
2021 if (DECL_INITIAL (newdecl
))
2023 if (DECL_INITIAL (olddecl
))
2025 /* If both decls are in the same TU and the new declaration
2026 isn't overriding an extern inline reject the new decl.
2027 In c99, no overriding is allowed in the same translation
2029 if ((!DECL_EXTERN_INLINE (olddecl
)
2030 || DECL_EXTERN_INLINE (newdecl
)
2031 || (!flag_gnu89_inline
2032 && (!DECL_DECLARED_INLINE_P (olddecl
)
2033 || !lookup_attribute ("gnu_inline",
2034 DECL_ATTRIBUTES (olddecl
)))
2035 && (!DECL_DECLARED_INLINE_P (newdecl
)
2036 || !lookup_attribute ("gnu_inline",
2037 DECL_ATTRIBUTES (newdecl
))))
2039 && same_translation_unit_p (newdecl
, olddecl
))
2041 error ("redefinition of %q+D", newdecl
);
2042 locate_old_decl (olddecl
);
2047 /* If we have a prototype after an old-style function definition,
2048 the argument types must be checked specially. */
2049 else if (DECL_INITIAL (olddecl
)
2050 && !prototype_p (oldtype
) && prototype_p (newtype
)
2051 && TYPE_ACTUAL_ARG_TYPES (oldtype
)
2052 && !validate_proto_after_old_defn (newdecl
, newtype
, oldtype
))
2054 locate_old_decl (olddecl
);
2057 /* A non-static declaration (even an "extern") followed by a
2058 static declaration is undefined behavior per C99 6.2.2p3-5,7.
2059 The same is true for a static forward declaration at block
2060 scope followed by a non-static declaration/definition at file
2061 scope. Static followed by non-static at the same scope is
2062 not undefined behavior, and is the most convenient way to get
2063 some effects (see e.g. what unwind-dw2-fde-glibc.c does to
2064 the definition of _Unwind_Find_FDE in unwind-dw2-fde.c), but
2065 we do diagnose it if -Wtraditional. */
2066 if (TREE_PUBLIC (olddecl
) && !TREE_PUBLIC (newdecl
))
2068 /* Two exceptions to the rule. If olddecl is an extern
2069 inline, or a predeclared function that isn't actually
2070 built in, newdecl silently overrides olddecl. The latter
2071 occur only in Objective C; see also above. (FIXME: Make
2072 Objective C use normal builtins.) */
2073 if (!DECL_IS_BUILTIN (olddecl
)
2074 && !DECL_EXTERN_INLINE (olddecl
))
2076 error ("static declaration of %q+D follows "
2077 "non-static declaration", newdecl
);
2078 locate_old_decl (olddecl
);
2082 else if (TREE_PUBLIC (newdecl
) && !TREE_PUBLIC (olddecl
))
2084 if (DECL_CONTEXT (olddecl
))
2086 error ("non-static declaration of %q+D follows "
2087 "static declaration", newdecl
);
2088 locate_old_decl (olddecl
);
2091 else if (warn_traditional
)
2093 warned
|= warning (OPT_Wtraditional
,
2094 "non-static declaration of %q+D "
2095 "follows static declaration", newdecl
);
2099 /* Make sure gnu_inline attribute is either not present, or
2100 present on all inline decls. */
2101 if (DECL_DECLARED_INLINE_P (olddecl
)
2102 && DECL_DECLARED_INLINE_P (newdecl
))
2104 bool newa
= lookup_attribute ("gnu_inline",
2105 DECL_ATTRIBUTES (newdecl
)) != NULL
;
2106 bool olda
= lookup_attribute ("gnu_inline",
2107 DECL_ATTRIBUTES (olddecl
)) != NULL
;
2110 error_at (input_location
, "%<gnu_inline%> attribute present on %q+D",
2111 newa
? newdecl
: olddecl
);
2112 error_at (DECL_SOURCE_LOCATION (newa
? olddecl
: newdecl
),
2117 else if (VAR_P (newdecl
))
2119 /* Only variables can be thread-local, and all declarations must
2120 agree on this property. */
2121 if (C_DECL_THREADPRIVATE_P (olddecl
) && !DECL_THREAD_LOCAL_P (newdecl
))
2123 /* Nothing to check. Since OLDDECL is marked threadprivate
2124 and NEWDECL does not have a thread-local attribute, we
2125 will merge the threadprivate attribute into NEWDECL. */
2128 else if (DECL_THREAD_LOCAL_P (newdecl
) != DECL_THREAD_LOCAL_P (olddecl
))
2130 if (DECL_THREAD_LOCAL_P (newdecl
))
2131 error ("thread-local declaration of %q+D follows "
2132 "non-thread-local declaration", newdecl
);
2134 error ("non-thread-local declaration of %q+D follows "
2135 "thread-local declaration", newdecl
);
2137 locate_old_decl (olddecl
);
2141 /* Multiple initialized definitions are not allowed (6.9p3,5). */
2142 if (DECL_INITIAL (newdecl
) && DECL_INITIAL (olddecl
))
2144 error ("redefinition of %q+D", newdecl
);
2145 locate_old_decl (olddecl
);
2149 /* Objects declared at file scope: if the first declaration had
2150 external linkage (even if it was an external reference) the
2151 second must have external linkage as well, or the behavior is
2152 undefined. If the first declaration had internal linkage, then
2153 the second must too, or else be an external reference (in which
2154 case the composite declaration still has internal linkage).
2155 As for function declarations, we warn about the static-then-
2156 extern case only for -Wtraditional. See generally 6.2.2p3-5,7. */
2157 if (DECL_FILE_SCOPE_P (newdecl
)
2158 && TREE_PUBLIC (newdecl
) != TREE_PUBLIC (olddecl
))
2160 if (DECL_EXTERNAL (newdecl
))
2162 if (!DECL_FILE_SCOPE_P (olddecl
))
2164 error ("extern declaration of %q+D follows "
2165 "declaration with no linkage", newdecl
);
2166 locate_old_decl (olddecl
);
2169 else if (warn_traditional
)
2171 warned
|= warning (OPT_Wtraditional
,
2172 "non-static declaration of %q+D "
2173 "follows static declaration", newdecl
);
2178 if (TREE_PUBLIC (newdecl
))
2179 error ("non-static declaration of %q+D follows "
2180 "static declaration", newdecl
);
2182 error ("static declaration of %q+D follows "
2183 "non-static declaration", newdecl
);
2185 locate_old_decl (olddecl
);
2189 /* Two objects with the same name declared at the same block
2190 scope must both be external references (6.7p3). */
2191 else if (!DECL_FILE_SCOPE_P (newdecl
))
2193 if (DECL_EXTERNAL (newdecl
))
2195 /* Extern with initializer at block scope, which will
2196 already have received an error. */
2198 else if (DECL_EXTERNAL (olddecl
))
2200 error ("declaration of %q+D with no linkage follows "
2201 "extern declaration", newdecl
);
2202 locate_old_decl (olddecl
);
2206 error ("redeclaration of %q+D with no linkage", newdecl
);
2207 locate_old_decl (olddecl
);
2213 /* C++ does not permit a decl to appear multiple times at file
2216 && DECL_FILE_SCOPE_P (newdecl
)
2217 && !DECL_EXTERNAL (newdecl
)
2218 && !DECL_EXTERNAL (olddecl
))
2219 warned
|= warning_at (DECL_SOURCE_LOCATION (newdecl
),
2221 ("duplicate declaration of %qD is "
2227 /* All decls must agree on a visibility. */
2228 if (CODE_CONTAINS_STRUCT (TREE_CODE (newdecl
), TS_DECL_WITH_VIS
)
2229 && DECL_VISIBILITY_SPECIFIED (newdecl
) && DECL_VISIBILITY_SPECIFIED (olddecl
)
2230 && DECL_VISIBILITY (newdecl
) != DECL_VISIBILITY (olddecl
))
2232 warned
|= warning (0, "redeclaration of %q+D with different visibility "
2233 "(old visibility preserved)", newdecl
);
2236 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2237 warned
|= diagnose_mismatched_attributes (olddecl
, newdecl
);
2238 else /* PARM_DECL, VAR_DECL */
2240 /* Redeclaration of a parameter is a constraint violation (this is
2241 not explicitly stated, but follows from C99 6.7p3 [no more than
2242 one declaration of the same identifier with no linkage in the
2243 same scope, except type tags] and 6.2.2p6 [parameters have no
2244 linkage]). We must check for a forward parameter declaration,
2245 indicated by TREE_ASM_WRITTEN on the old declaration - this is
2246 an extension, the mandatory diagnostic for which is handled by
2247 mark_forward_parm_decls. */
2249 if (TREE_CODE (newdecl
) == PARM_DECL
2250 && (!TREE_ASM_WRITTEN (olddecl
) || TREE_ASM_WRITTEN (newdecl
)))
2252 error ("redefinition of parameter %q+D", newdecl
);
2253 locate_old_decl (olddecl
);
2258 /* Optional warning for completely redundant decls. */
2259 if (!warned
&& !pedwarned
2260 && warn_redundant_decls
2261 /* Don't warn about a function declaration followed by a
2263 && !(TREE_CODE (newdecl
) == FUNCTION_DECL
2264 && DECL_INITIAL (newdecl
) && !DECL_INITIAL (olddecl
))
2265 /* Don't warn about redundant redeclarations of builtins. */
2266 && !(TREE_CODE (newdecl
) == FUNCTION_DECL
2267 && !DECL_BUILT_IN (newdecl
)
2268 && DECL_BUILT_IN (olddecl
)
2269 && !C_DECL_DECLARED_BUILTIN (olddecl
))
2270 /* Don't warn about an extern followed by a definition. */
2271 && !(DECL_EXTERNAL (olddecl
) && !DECL_EXTERNAL (newdecl
))
2272 /* Don't warn about forward parameter decls. */
2273 && !(TREE_CODE (newdecl
) == PARM_DECL
2274 && TREE_ASM_WRITTEN (olddecl
) && !TREE_ASM_WRITTEN (newdecl
))
2275 /* Don't warn about a variable definition following a declaration. */
2276 && !(VAR_P (newdecl
)
2277 && DECL_INITIAL (newdecl
) && !DECL_INITIAL (olddecl
)))
2279 warned
= warning (OPT_Wredundant_decls
, "redundant redeclaration of %q+D",
2283 /* Report location of previous decl/defn. */
2284 if (warned
|| pedwarned
)
2285 locate_old_decl (olddecl
);
2287 #undef DECL_EXTERN_INLINE
2292 /* Subroutine of duplicate_decls. NEWDECL has been found to be
2293 consistent with OLDDECL, but carries new information. Merge the
2294 new information into OLDDECL. This function issues no
2298 merge_decls (tree newdecl
, tree olddecl
, tree newtype
, tree oldtype
)
2300 bool new_is_definition
= (TREE_CODE (newdecl
) == FUNCTION_DECL
2301 && DECL_INITIAL (newdecl
) != NULL_TREE
);
2302 bool new_is_prototype
= (TREE_CODE (newdecl
) == FUNCTION_DECL
2303 && prototype_p (TREE_TYPE (newdecl
)));
2304 bool old_is_prototype
= (TREE_CODE (olddecl
) == FUNCTION_DECL
2305 && prototype_p (TREE_TYPE (olddecl
)));
2307 /* For real parm decl following a forward decl, rechain the old decl
2308 in its new location and clear TREE_ASM_WRITTEN (it's not a
2309 forward decl anymore). */
2310 if (TREE_CODE (newdecl
) == PARM_DECL
2311 && TREE_ASM_WRITTEN (olddecl
) && !TREE_ASM_WRITTEN (newdecl
))
2313 struct c_binding
*b
, **here
;
2315 for (here
= ¤t_scope
->bindings
; *here
; here
= &(*here
)->prev
)
2316 if ((*here
)->decl
== olddecl
)
2323 b
->prev
= current_scope
->bindings
;
2324 current_scope
->bindings
= b
;
2326 TREE_ASM_WRITTEN (olddecl
) = 0;
2329 DECL_ATTRIBUTES (newdecl
)
2330 = targetm
.merge_decl_attributes (olddecl
, newdecl
);
2332 /* For typedefs use the old type, as the new type's DECL_NAME points
2333 at newdecl, which will be ggc_freed. */
2334 if (TREE_CODE (newdecl
) == TYPE_DECL
)
2336 /* But NEWTYPE might have an attribute, honor that. */
2340 if (TYPE_USER_ALIGN (tem
))
2342 if (TYPE_ALIGN (tem
) > TYPE_ALIGN (newtype
))
2343 SET_TYPE_ALIGN (newtype
, TYPE_ALIGN (tem
));
2344 TYPE_USER_ALIGN (newtype
) = true;
2347 /* And remove the new type from the variants list. */
2348 if (TYPE_NAME (TREE_TYPE (newdecl
)) == newdecl
)
2350 tree remove
= TREE_TYPE (newdecl
);
2351 for (tree t
= TYPE_MAIN_VARIANT (remove
); ;
2352 t
= TYPE_NEXT_VARIANT (t
))
2353 if (TYPE_NEXT_VARIANT (t
) == remove
)
2355 TYPE_NEXT_VARIANT (t
) = TYPE_NEXT_VARIANT (remove
);
2361 /* Merge the data types specified in the two decls. */
2363 = TREE_TYPE (olddecl
)
2364 = composite_type (newtype
, oldtype
);
2366 /* Lay the type out, unless already done. */
2367 if (!comptypes (oldtype
, TREE_TYPE (newdecl
)))
2369 if (TREE_TYPE (newdecl
) != error_mark_node
)
2370 layout_type (TREE_TYPE (newdecl
));
2371 if (TREE_CODE (newdecl
) != FUNCTION_DECL
2372 && TREE_CODE (newdecl
) != TYPE_DECL
2373 && TREE_CODE (newdecl
) != CONST_DECL
)
2374 layout_decl (newdecl
, 0);
2378 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
2379 DECL_SIZE (newdecl
) = DECL_SIZE (olddecl
);
2380 DECL_SIZE_UNIT (newdecl
) = DECL_SIZE_UNIT (olddecl
);
2381 SET_DECL_MODE (newdecl
, DECL_MODE (olddecl
));
2382 if (DECL_ALIGN (olddecl
) > DECL_ALIGN (newdecl
))
2384 SET_DECL_ALIGN (newdecl
, DECL_ALIGN (olddecl
));
2385 DECL_USER_ALIGN (newdecl
) |= DECL_USER_ALIGN (olddecl
);
2389 /* Keep the old rtl since we can safely use it. */
2390 if (HAS_RTL_P (olddecl
))
2391 COPY_DECL_RTL (olddecl
, newdecl
);
2393 /* Merge the type qualifiers. */
2394 if (TREE_READONLY (newdecl
))
2395 TREE_READONLY (olddecl
) = 1;
2397 if (TREE_THIS_VOLATILE (newdecl
))
2398 TREE_THIS_VOLATILE (olddecl
) = 1;
2400 /* Merge deprecatedness. */
2401 if (TREE_DEPRECATED (newdecl
))
2402 TREE_DEPRECATED (olddecl
) = 1;
2404 /* If a decl is in a system header and the other isn't, keep the one on the
2405 system header. Otherwise, keep source location of definition rather than
2406 declaration and of prototype rather than non-prototype unless that
2407 prototype is built-in. */
2408 if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl
), TS_DECL_WITH_VIS
)
2409 && DECL_IN_SYSTEM_HEADER (olddecl
)
2410 && !DECL_IN_SYSTEM_HEADER (newdecl
) )
2411 DECL_SOURCE_LOCATION (newdecl
) = DECL_SOURCE_LOCATION (olddecl
);
2412 else if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl
), TS_DECL_WITH_VIS
)
2413 && DECL_IN_SYSTEM_HEADER (newdecl
)
2414 && !DECL_IN_SYSTEM_HEADER (olddecl
))
2415 DECL_SOURCE_LOCATION (olddecl
) = DECL_SOURCE_LOCATION (newdecl
);
2416 else if ((DECL_INITIAL (newdecl
) == NULL_TREE
2417 && DECL_INITIAL (olddecl
) != NULL_TREE
)
2418 || (old_is_prototype
&& !new_is_prototype
2419 && !C_DECL_BUILTIN_PROTOTYPE (olddecl
)))
2420 DECL_SOURCE_LOCATION (newdecl
) = DECL_SOURCE_LOCATION (olddecl
);
2422 /* Merge the initialization information. */
2423 if (DECL_INITIAL (newdecl
) == NULL_TREE
)
2424 DECL_INITIAL (newdecl
) = DECL_INITIAL (olddecl
);
2426 /* Merge the threadprivate attribute. */
2427 if (VAR_P (olddecl
) && C_DECL_THREADPRIVATE_P (olddecl
))
2428 C_DECL_THREADPRIVATE_P (newdecl
) = 1;
2430 if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl
), TS_DECL_WITH_VIS
))
2432 /* Copy the assembler name.
2433 Currently, it can only be defined in the prototype. */
2434 COPY_DECL_ASSEMBLER_NAME (olddecl
, newdecl
);
2436 /* Use visibility of whichever declaration had it specified */
2437 if (DECL_VISIBILITY_SPECIFIED (olddecl
))
2439 DECL_VISIBILITY (newdecl
) = DECL_VISIBILITY (olddecl
);
2440 DECL_VISIBILITY_SPECIFIED (newdecl
) = 1;
2443 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2445 DECL_STATIC_CONSTRUCTOR(newdecl
) |= DECL_STATIC_CONSTRUCTOR(olddecl
);
2446 DECL_STATIC_DESTRUCTOR (newdecl
) |= DECL_STATIC_DESTRUCTOR (olddecl
);
2447 DECL_NO_LIMIT_STACK (newdecl
) |= DECL_NO_LIMIT_STACK (olddecl
);
2448 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl
)
2449 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl
);
2450 TREE_THIS_VOLATILE (newdecl
) |= TREE_THIS_VOLATILE (olddecl
);
2451 DECL_IS_MALLOC (newdecl
) |= DECL_IS_MALLOC (olddecl
);
2452 DECL_IS_OPERATOR_NEW (newdecl
) |= DECL_IS_OPERATOR_NEW (olddecl
);
2453 TREE_READONLY (newdecl
) |= TREE_READONLY (olddecl
);
2454 DECL_PURE_P (newdecl
) |= DECL_PURE_P (olddecl
);
2455 DECL_IS_NOVOPS (newdecl
) |= DECL_IS_NOVOPS (olddecl
);
2458 /* Merge the storage class information. */
2459 merge_weak (newdecl
, olddecl
);
2461 /* For functions, static overrides non-static. */
2462 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2464 TREE_PUBLIC (newdecl
) &= TREE_PUBLIC (olddecl
);
2465 /* This is since we don't automatically
2466 copy the attributes of NEWDECL into OLDDECL. */
2467 TREE_PUBLIC (olddecl
) = TREE_PUBLIC (newdecl
);
2468 /* If this clears `static', clear it in the identifier too. */
2469 if (!TREE_PUBLIC (olddecl
))
2470 TREE_PUBLIC (DECL_NAME (olddecl
)) = 0;
2474 /* In c99, 'extern' declaration before (or after) 'inline' means this
2475 function is not DECL_EXTERNAL, unless 'gnu_inline' attribute
2477 if (TREE_CODE (newdecl
) == FUNCTION_DECL
2478 && !flag_gnu89_inline
2479 && (DECL_DECLARED_INLINE_P (newdecl
)
2480 || DECL_DECLARED_INLINE_P (olddecl
))
2481 && (!DECL_DECLARED_INLINE_P (newdecl
)
2482 || !DECL_DECLARED_INLINE_P (olddecl
)
2483 || !DECL_EXTERNAL (olddecl
))
2484 && DECL_EXTERNAL (newdecl
)
2485 && !lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (newdecl
))
2486 && !current_function_decl
)
2487 DECL_EXTERNAL (newdecl
) = 0;
2489 /* An inline definition following a static declaration is not
2491 if (new_is_definition
2492 && (DECL_DECLARED_INLINE_P (newdecl
)
2493 || DECL_DECLARED_INLINE_P (olddecl
))
2494 && !TREE_PUBLIC (olddecl
))
2495 DECL_EXTERNAL (newdecl
) = 0;
2497 if (DECL_EXTERNAL (newdecl
))
2499 TREE_STATIC (newdecl
) = TREE_STATIC (olddecl
);
2500 DECL_EXTERNAL (newdecl
) = DECL_EXTERNAL (olddecl
);
2502 /* An extern decl does not override previous storage class. */
2503 TREE_PUBLIC (newdecl
) = TREE_PUBLIC (olddecl
);
2504 if (!DECL_EXTERNAL (newdecl
))
2506 DECL_CONTEXT (newdecl
) = DECL_CONTEXT (olddecl
);
2507 DECL_COMMON (newdecl
) = DECL_COMMON (olddecl
);
2512 TREE_STATIC (olddecl
) = TREE_STATIC (newdecl
);
2513 TREE_PUBLIC (olddecl
) = TREE_PUBLIC (newdecl
);
2516 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2518 /* If we're redefining a function previously defined as extern
2519 inline, make sure we emit debug info for the inline before we
2520 throw it away, in case it was inlined into a function that
2521 hasn't been written out yet. */
2522 if (new_is_definition
&& DECL_INITIAL (olddecl
))
2523 /* The new defn must not be inline. */
2524 DECL_UNINLINABLE (newdecl
) = 1;
2527 /* If either decl says `inline', this fn is inline, unless
2528 its definition was passed already. */
2529 if (DECL_DECLARED_INLINE_P (newdecl
)
2530 || DECL_DECLARED_INLINE_P (olddecl
))
2531 DECL_DECLARED_INLINE_P (newdecl
) = 1;
2533 DECL_UNINLINABLE (newdecl
) = DECL_UNINLINABLE (olddecl
)
2534 = (DECL_UNINLINABLE (newdecl
) || DECL_UNINLINABLE (olddecl
));
2536 DECL_DISREGARD_INLINE_LIMITS (newdecl
)
2537 = DECL_DISREGARD_INLINE_LIMITS (olddecl
)
2538 = (DECL_DISREGARD_INLINE_LIMITS (newdecl
)
2539 || DECL_DISREGARD_INLINE_LIMITS (olddecl
));
2542 if (DECL_BUILT_IN (olddecl
))
2544 /* If redeclaring a builtin function, it stays built in.
2545 But it gets tagged as having been declared. */
2546 DECL_BUILT_IN_CLASS (newdecl
) = DECL_BUILT_IN_CLASS (olddecl
);
2547 DECL_FUNCTION_CODE (newdecl
) = DECL_FUNCTION_CODE (olddecl
);
2548 C_DECL_DECLARED_BUILTIN (newdecl
) = 1;
2549 if (new_is_prototype
)
2551 C_DECL_BUILTIN_PROTOTYPE (newdecl
) = 0;
2552 if (DECL_BUILT_IN_CLASS (newdecl
) == BUILT_IN_NORMAL
)
2554 enum built_in_function fncode
= DECL_FUNCTION_CODE (newdecl
);
2557 /* If a compatible prototype of these builtin functions
2558 is seen, assume the runtime implements it with the
2559 expected semantics. */
2560 case BUILT_IN_STPCPY
:
2561 if (builtin_decl_explicit_p (fncode
))
2562 set_builtin_decl_implicit_p (fncode
, true);
2565 if (builtin_decl_explicit_p (fncode
))
2566 set_builtin_decl_declared_p (fncode
, true);
2572 C_DECL_BUILTIN_PROTOTYPE (newdecl
)
2573 = C_DECL_BUILTIN_PROTOTYPE (olddecl
);
2576 /* Preserve function specific target and optimization options */
2577 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl
)
2578 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl
))
2579 DECL_FUNCTION_SPECIFIC_TARGET (newdecl
)
2580 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl
);
2582 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl
)
2583 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl
))
2584 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl
)
2585 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl
);
2587 /* Also preserve various other info from the definition. */
2588 if (!new_is_definition
)
2591 DECL_RESULT (newdecl
) = DECL_RESULT (olddecl
);
2592 DECL_INITIAL (newdecl
) = DECL_INITIAL (olddecl
);
2593 DECL_STRUCT_FUNCTION (newdecl
) = DECL_STRUCT_FUNCTION (olddecl
);
2594 DECL_SAVED_TREE (newdecl
) = DECL_SAVED_TREE (olddecl
);
2595 DECL_ARGUMENTS (newdecl
) = copy_list (DECL_ARGUMENTS (olddecl
));
2596 for (t
= DECL_ARGUMENTS (newdecl
); t
; t
= DECL_CHAIN (t
))
2597 DECL_CONTEXT (t
) = newdecl
;
2599 /* See if we've got a function to instantiate from. */
2600 if (DECL_SAVED_TREE (olddecl
))
2601 DECL_ABSTRACT_ORIGIN (newdecl
)
2602 = DECL_ABSTRACT_ORIGIN (olddecl
);
2606 /* Merge the USED information. */
2607 if (TREE_USED (olddecl
))
2608 TREE_USED (newdecl
) = 1;
2609 else if (TREE_USED (newdecl
))
2610 TREE_USED (olddecl
) = 1;
2611 if (VAR_P (olddecl
) || TREE_CODE (olddecl
) == PARM_DECL
)
2612 DECL_READ_P (newdecl
) |= DECL_READ_P (olddecl
);
2613 if (DECL_PRESERVE_P (olddecl
))
2614 DECL_PRESERVE_P (newdecl
) = 1;
2615 else if (DECL_PRESERVE_P (newdecl
))
2616 DECL_PRESERVE_P (olddecl
) = 1;
2618 /* Merge DECL_COMMON */
2619 if (VAR_P (olddecl
) && VAR_P (newdecl
)
2620 && !lookup_attribute ("common", DECL_ATTRIBUTES (newdecl
))
2621 && !lookup_attribute ("nocommon", DECL_ATTRIBUTES (newdecl
)))
2622 DECL_COMMON (newdecl
) = DECL_COMMON (newdecl
) && DECL_COMMON (olddecl
);
2624 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
2625 But preserve OLDDECL's DECL_UID, DECL_CONTEXT and
2626 DECL_ARGUMENTS (if appropriate). */
2628 unsigned olddecl_uid
= DECL_UID (olddecl
);
2629 tree olddecl_context
= DECL_CONTEXT (olddecl
);
2630 tree olddecl_arguments
= NULL
;
2631 if (TREE_CODE (olddecl
) == FUNCTION_DECL
)
2632 olddecl_arguments
= DECL_ARGUMENTS (olddecl
);
2634 memcpy ((char *) olddecl
+ sizeof (struct tree_common
),
2635 (char *) newdecl
+ sizeof (struct tree_common
),
2636 sizeof (struct tree_decl_common
) - sizeof (struct tree_common
));
2637 DECL_USER_ALIGN (olddecl
) = DECL_USER_ALIGN (newdecl
);
2638 switch (TREE_CODE (olddecl
))
2643 struct symtab_node
*snode
= olddecl
->decl_with_vis
.symtab_node
;
2645 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
2646 (char *) newdecl
+ sizeof (struct tree_decl_common
),
2647 tree_code_size (TREE_CODE (olddecl
)) - sizeof (struct tree_decl_common
));
2648 olddecl
->decl_with_vis
.symtab_node
= snode
;
2650 if ((DECL_EXTERNAL (olddecl
)
2651 || TREE_PUBLIC (olddecl
)
2652 || TREE_STATIC (olddecl
))
2653 && DECL_SECTION_NAME (newdecl
) != NULL
)
2654 set_decl_section_name (olddecl
, DECL_SECTION_NAME (newdecl
));
2656 /* This isn't quite correct for something like
2657 int __thread x attribute ((tls_model ("local-exec")));
2658 extern int __thread x;
2659 as we'll lose the "local-exec" model. */
2660 if (VAR_P (olddecl
) && DECL_THREAD_LOCAL_P (newdecl
))
2661 set_decl_tls_model (olddecl
, DECL_TLS_MODEL (newdecl
));
2671 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
2672 (char *) newdecl
+ sizeof (struct tree_decl_common
),
2673 tree_code_size (TREE_CODE (olddecl
)) - sizeof (struct tree_decl_common
));
2678 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
2679 (char *) newdecl
+ sizeof (struct tree_decl_common
),
2680 sizeof (struct tree_decl_non_common
) - sizeof (struct tree_decl_common
));
2682 DECL_UID (olddecl
) = olddecl_uid
;
2683 DECL_CONTEXT (olddecl
) = olddecl_context
;
2684 if (TREE_CODE (olddecl
) == FUNCTION_DECL
)
2685 DECL_ARGUMENTS (olddecl
) = olddecl_arguments
;
2688 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2689 so that encode_section_info has a chance to look at the new decl
2690 flags and attributes. */
2691 if (DECL_RTL_SET_P (olddecl
)
2692 && (TREE_CODE (olddecl
) == FUNCTION_DECL
2693 || (VAR_P (olddecl
) && TREE_STATIC (olddecl
))))
2694 make_decl_rtl (olddecl
);
2697 /* Handle when a new declaration NEWDECL has the same name as an old
2698 one OLDDECL in the same binding contour. Prints an error message
2701 If safely possible, alter OLDDECL to look like NEWDECL, and return
2702 true. Otherwise, return false. */
2705 duplicate_decls (tree newdecl
, tree olddecl
)
2707 tree newtype
= NULL
, oldtype
= NULL
;
2709 if (!diagnose_mismatched_decls (newdecl
, olddecl
, &newtype
, &oldtype
))
2711 /* Avoid `unused variable' and other warnings for OLDDECL. */
2712 TREE_NO_WARNING (olddecl
) = 1;
2716 merge_decls (newdecl
, olddecl
, newtype
, oldtype
);
2718 /* The NEWDECL will no longer be needed.
2720 Before releasing the node, be sure to remove function from symbol
2721 table that might have been inserted there to record comdat group.
2722 Be sure to however do not free DECL_STRUCT_FUNCTION because this
2723 structure is shared in between NEWDECL and OLDECL. */
2724 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2725 DECL_STRUCT_FUNCTION (newdecl
) = NULL
;
2726 if (VAR_OR_FUNCTION_DECL_P (newdecl
))
2728 struct symtab_node
*snode
= symtab_node::get (newdecl
);
2737 /* Check whether decl-node NEW_DECL shadows an existing declaration. */
2739 warn_if_shadowing (tree new_decl
)
2741 struct c_binding
*b
;
2743 /* Shadow warnings wanted? */
2745 || warn_shadow_local
2746 || warn_shadow_compatible_local
)
2747 /* No shadow warnings for internally generated vars. */
2748 || DECL_IS_BUILTIN (new_decl
)
2749 /* No shadow warnings for vars made for inlining. */
2750 || DECL_FROM_INLINE (new_decl
))
2753 /* Is anything being shadowed? Invisible decls do not count. */
2754 for (b
= I_SYMBOL_BINDING (DECL_NAME (new_decl
)); b
; b
= b
->shadowed
)
2755 if (b
->decl
&& b
->decl
!= new_decl
&& !b
->invisible
2756 && (b
->decl
== error_mark_node
2757 || diagnostic_report_warnings_p (global_dc
,
2758 DECL_SOURCE_LOCATION (b
->decl
))))
2760 tree old_decl
= b
->decl
;
2761 bool warned
= false;
2763 if (old_decl
== error_mark_node
)
2765 warning (OPT_Wshadow
, "declaration of %q+D shadows previous "
2766 "non-variable", new_decl
);
2769 else if (TREE_CODE (old_decl
) == PARM_DECL
)
2771 enum opt_code warning_code
;
2773 /* If '-Wshadow=compatible-local' is specified without other
2774 -Wshadow= flags, we will warn only when the types of the
2775 shadowing variable (i.e. new_decl) and the shadowed variable
2776 (old_decl) are compatible. */
2778 warning_code
= OPT_Wshadow
;
2779 else if (comptypes (TREE_TYPE (old_decl
), TREE_TYPE (new_decl
)))
2780 warning_code
= OPT_Wshadow_compatible_local
;
2782 warning_code
= OPT_Wshadow_local
;
2783 warned
= warning_at (DECL_SOURCE_LOCATION (new_decl
), warning_code
,
2784 "declaration of %qD shadows a parameter",
2787 else if (DECL_FILE_SCOPE_P (old_decl
))
2789 /* Do not warn if a variable shadows a function, unless
2790 the variable is a function or a pointer-to-function. */
2791 if (TREE_CODE (old_decl
) == FUNCTION_DECL
2792 && TREE_CODE (new_decl
) != FUNCTION_DECL
2793 && !FUNCTION_POINTER_TYPE_P (TREE_TYPE (new_decl
)))
2796 warned
= warning_at (DECL_SOURCE_LOCATION (new_decl
), OPT_Wshadow
,
2797 "declaration of %qD shadows a global "
2801 else if (TREE_CODE (old_decl
) == FUNCTION_DECL
2802 && DECL_BUILT_IN (old_decl
))
2804 warning (OPT_Wshadow
, "declaration of %q+D shadows "
2805 "a built-in function", new_decl
);
2810 enum opt_code warning_code
;
2812 /* If '-Wshadow=compatible-local' is specified without other
2813 -Wshadow= flags, we will warn only when the types of the
2814 shadowing variable (i.e. new_decl) and the shadowed variable
2815 (old_decl) are compatible. */
2817 warning_code
= OPT_Wshadow
;
2818 else if (comptypes (TREE_TYPE (old_decl
), TREE_TYPE (new_decl
)))
2819 warning_code
= OPT_Wshadow_compatible_local
;
2821 warning_code
= OPT_Wshadow_local
;
2822 warned
= warning_at (DECL_SOURCE_LOCATION (new_decl
), warning_code
,
2823 "declaration of %qD shadows a previous local",
2828 inform (DECL_SOURCE_LOCATION (old_decl
),
2829 "shadowed declaration is here");
2835 /* Record a decl-node X as belonging to the current lexical scope.
2836 Check for errors (such as an incompatible declaration for the same
2837 name already seen in the same scope).
2839 Returns either X or an old decl for the same name.
2840 If an old decl is returned, it may have been smashed
2841 to agree with what X says. */
2846 tree name
= DECL_NAME (x
);
2847 struct c_scope
*scope
= current_scope
;
2848 struct c_binding
*b
;
2849 bool nested
= false;
2850 location_t locus
= DECL_SOURCE_LOCATION (x
);
2852 /* Must set DECL_CONTEXT for everything not at file scope or
2853 DECL_FILE_SCOPE_P won't work. Local externs don't count
2854 unless they have initializers (which generate code). */
2855 if (current_function_decl
2856 && (!VAR_OR_FUNCTION_DECL_P (x
)
2857 || DECL_INITIAL (x
) || !DECL_EXTERNAL (x
)))
2858 DECL_CONTEXT (x
) = current_function_decl
;
2860 /* Anonymous decls are just inserted in the scope. */
2863 bind (name
, x
, scope
, /*invisible=*/false, /*nested=*/false,
2868 /* First, see if there is another declaration with the same name in
2869 the current scope. If there is, duplicate_decls may do all the
2870 work for us. If duplicate_decls returns false, that indicates
2871 two incompatible decls in the same scope; we are to silently
2872 replace the old one (duplicate_decls has issued all appropriate
2873 diagnostics). In particular, we should not consider possible
2874 duplicates in the external scope, or shadowing. */
2875 b
= I_SYMBOL_BINDING (name
);
2876 if (b
&& B_IN_SCOPE (b
, scope
))
2878 struct c_binding
*b_ext
, *b_use
;
2879 tree type
= TREE_TYPE (x
);
2880 tree visdecl
= b
->decl
;
2881 tree vistype
= TREE_TYPE (visdecl
);
2882 if (TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
2883 && COMPLETE_TYPE_P (TREE_TYPE (x
)))
2884 b
->inner_comp
= false;
2887 /* If this is an external linkage declaration, we should check
2888 for compatibility with the type in the external scope before
2889 setting the type at this scope based on the visible
2890 information only. */
2891 if (TREE_PUBLIC (x
) && TREE_PUBLIC (visdecl
))
2893 while (b_ext
&& !B_IN_EXTERNAL_SCOPE (b_ext
))
2894 b_ext
= b_ext
->shadowed
;
2899 TREE_TYPE (b_use
->decl
) = b_use
->u
.type
;
2902 if (duplicate_decls (x
, b_use
->decl
))
2906 /* Save the updated type in the external scope and
2907 restore the proper type for this scope. */
2909 if (comptypes (vistype
, type
))
2910 thistype
= composite_type (vistype
, type
);
2912 thistype
= TREE_TYPE (b_use
->decl
);
2913 b_use
->u
.type
= TREE_TYPE (b_use
->decl
);
2914 if (TREE_CODE (b_use
->decl
) == FUNCTION_DECL
2915 && DECL_BUILT_IN (b_use
->decl
))
2917 = build_type_attribute_variant (thistype
,
2920 TREE_TYPE (b_use
->decl
) = thistype
;
2925 goto skip_external_and_shadow_checks
;
2928 /* All declarations with external linkage, and all external
2929 references, go in the external scope, no matter what scope is
2930 current. However, the binding in that scope is ignored for
2931 purposes of normal name lookup. A separate binding structure is
2932 created in the requested scope; this governs the normal
2933 visibility of the symbol.
2935 The binding in the externals scope is used exclusively for
2936 detecting duplicate declarations of the same object, no matter
2937 what scope they are in; this is what we do here. (C99 6.2.7p2:
2938 All declarations that refer to the same object or function shall
2939 have compatible type; otherwise, the behavior is undefined.) */
2940 if (DECL_EXTERNAL (x
) || scope
== file_scope
)
2942 tree type
= TREE_TYPE (x
);
2943 tree vistype
= NULL_TREE
;
2944 tree visdecl
= NULL_TREE
;
2945 bool type_saved
= false;
2946 if (b
&& !B_IN_EXTERNAL_SCOPE (b
)
2947 && VAR_OR_FUNCTION_DECL_P (b
->decl
)
2948 && DECL_FILE_SCOPE_P (b
->decl
))
2951 vistype
= TREE_TYPE (visdecl
);
2953 if (scope
!= file_scope
2954 && !DECL_IN_SYSTEM_HEADER (x
))
2955 warning_at (locus
, OPT_Wnested_externs
,
2956 "nested extern declaration of %qD", x
);
2958 while (b
&& !B_IN_EXTERNAL_SCOPE (b
))
2960 /* If this decl might be modified, save its type. This is
2961 done here rather than when the decl is first bound
2962 because the type may change after first binding, through
2963 being completed or through attributes being added. If we
2964 encounter multiple such decls, only the first should have
2965 its type saved; the others will already have had their
2966 proper types saved and the types will not have changed as
2967 their scopes will not have been re-entered. */
2968 if (DECL_P (b
->decl
) && DECL_FILE_SCOPE_P (b
->decl
) && !type_saved
)
2970 b
->u
.type
= TREE_TYPE (b
->decl
);
2973 if (B_IN_FILE_SCOPE (b
)
2975 && TREE_STATIC (b
->decl
)
2976 && TREE_CODE (TREE_TYPE (b
->decl
)) == ARRAY_TYPE
2977 && !TYPE_DOMAIN (TREE_TYPE (b
->decl
))
2978 && TREE_CODE (type
) == ARRAY_TYPE
2979 && TYPE_DOMAIN (type
)
2980 && TYPE_MAX_VALUE (TYPE_DOMAIN (type
))
2981 && !integer_zerop (TYPE_MAX_VALUE (TYPE_DOMAIN (type
))))
2983 /* Array type completed in inner scope, which should be
2984 diagnosed if the completion does not have size 1 and
2985 it does not get completed in the file scope. */
2986 b
->inner_comp
= true;
2991 /* If a matching external declaration has been found, set its
2992 type to the composite of all the types of that declaration.
2993 After the consistency checks, it will be reset to the
2994 composite of the visible types only. */
2995 if (b
&& (TREE_PUBLIC (x
) || same_translation_unit_p (x
, b
->decl
))
2997 TREE_TYPE (b
->decl
) = b
->u
.type
;
2999 /* The point of the same_translation_unit_p check here is,
3000 we want to detect a duplicate decl for a construct like
3001 foo() { extern bar(); } ... static bar(); but not if
3002 they are in different translation units. In any case,
3003 the static does not go in the externals scope. */
3005 && (TREE_PUBLIC (x
) || same_translation_unit_p (x
, b
->decl
))
3006 && duplicate_decls (x
, b
->decl
))
3011 if (comptypes (vistype
, type
))
3012 thistype
= composite_type (vistype
, type
);
3014 thistype
= TREE_TYPE (b
->decl
);
3018 b
->u
.type
= TREE_TYPE (b
->decl
);
3019 if (TREE_CODE (b
->decl
) == FUNCTION_DECL
&& DECL_BUILT_IN (b
->decl
))
3021 = build_type_attribute_variant (thistype
,
3022 TYPE_ATTRIBUTES (b
->u
.type
));
3023 TREE_TYPE (b
->decl
) = thistype
;
3024 bind (name
, b
->decl
, scope
, /*invisible=*/false, /*nested=*/true,
3028 else if (TREE_PUBLIC (x
))
3030 if (visdecl
&& !b
&& duplicate_decls (x
, visdecl
))
3032 /* An external declaration at block scope referring to a
3033 visible entity with internal linkage. The composite
3034 type will already be correct for this scope, so we
3035 just need to fall through to make the declaration in
3042 bind (name
, x
, external_scope
, /*invisible=*/true,
3043 /*nested=*/false, locus
);
3049 if (TREE_CODE (x
) != PARM_DECL
)
3050 warn_if_shadowing (x
);
3052 skip_external_and_shadow_checks
:
3053 if (TREE_CODE (x
) == TYPE_DECL
)
3055 /* So this is a typedef, set its underlying type. */
3056 set_underlying_type (x
);
3058 /* If X is a typedef defined in the current function, record it
3059 for the purpose of implementing the -Wunused-local-typedefs
3061 record_locally_defined_typedef (x
);
3064 bind (name
, x
, scope
, /*invisible=*/false, nested
, locus
);
3066 /* If x's type is incomplete because it's based on a
3067 structure or union which has not yet been fully declared,
3068 attach it to that structure or union type, so we can go
3069 back and complete the variable declaration later, if the
3070 structure or union gets fully declared.
3072 If the input is erroneous, we can have error_mark in the type
3073 slot (e.g. "f(void a, ...)") - that doesn't count as an
3075 if (TREE_TYPE (x
) != error_mark_node
3076 && !COMPLETE_TYPE_P (TREE_TYPE (x
)))
3078 tree element
= TREE_TYPE (x
);
3080 while (TREE_CODE (element
) == ARRAY_TYPE
)
3081 element
= TREE_TYPE (element
);
3082 element
= TYPE_MAIN_VARIANT (element
);
3084 if (RECORD_OR_UNION_TYPE_P (element
)
3085 && (TREE_CODE (x
) != TYPE_DECL
3086 || TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
)
3087 && !COMPLETE_TYPE_P (element
))
3088 C_TYPE_INCOMPLETE_VARS (element
)
3089 = tree_cons (NULL_TREE
, x
, C_TYPE_INCOMPLETE_VARS (element
));
3095 /* Issue a warning about implicit function declaration. ID is the function
3096 identifier, OLDDECL is a declaration of the function in a different scope,
3100 implicit_decl_warning (location_t loc
, tree id
, tree olddecl
)
3102 if (!warn_implicit_function_declaration
)
3106 const char *hint
= NULL
;
3108 hint
= lookup_name_fuzzy (id
, FUZZY_LOOKUP_FUNCTION_NAME
);
3114 gcc_rich_location
richloc (loc
);
3115 richloc
.add_fixit_replace (hint
);
3116 warned
= pedwarn_at_rich_loc
3117 (&richloc
, OPT_Wimplicit_function_declaration
,
3118 "implicit declaration of function %qE; did you mean %qs?",
3122 warned
= pedwarn (loc
, OPT_Wimplicit_function_declaration
,
3123 "implicit declaration of function %qE", id
);
3127 gcc_rich_location
richloc (loc
);
3128 richloc
.add_fixit_replace (hint
);
3129 warned
= warning_at_rich_loc
3130 (&richloc
, OPT_Wimplicit_function_declaration
,
3131 G_("implicit declaration of function %qE; did you mean %qs?"),
3135 warned
= warning_at (loc
, OPT_Wimplicit_function_declaration
,
3136 G_("implicit declaration of function %qE"), id
);
3138 if (olddecl
&& warned
)
3139 locate_old_decl (olddecl
);
3142 /* This function represents mapping of a function code FCODE
3143 to its respective header. */
3146 header_for_builtin_fn (enum built_in_function fcode
)
3150 CASE_FLT_FN (BUILT_IN_ACOS
):
3151 CASE_FLT_FN (BUILT_IN_ACOSH
):
3152 CASE_FLT_FN (BUILT_IN_ASIN
):
3153 CASE_FLT_FN (BUILT_IN_ASINH
):
3154 CASE_FLT_FN (BUILT_IN_ATAN
):
3155 CASE_FLT_FN (BUILT_IN_ATANH
):
3156 CASE_FLT_FN (BUILT_IN_ATAN2
):
3157 CASE_FLT_FN (BUILT_IN_CBRT
):
3158 CASE_FLT_FN (BUILT_IN_CEIL
):
3159 CASE_FLT_FN (BUILT_IN_COPYSIGN
):
3160 CASE_FLT_FN (BUILT_IN_COS
):
3161 CASE_FLT_FN (BUILT_IN_COSH
):
3162 CASE_FLT_FN (BUILT_IN_ERF
):
3163 CASE_FLT_FN (BUILT_IN_ERFC
):
3164 CASE_FLT_FN (BUILT_IN_EXP
):
3165 CASE_FLT_FN (BUILT_IN_EXP2
):
3166 CASE_FLT_FN (BUILT_IN_EXPM1
):
3167 CASE_FLT_FN (BUILT_IN_FABS
):
3168 CASE_FLT_FN (BUILT_IN_FDIM
):
3169 CASE_FLT_FN (BUILT_IN_FLOOR
):
3170 CASE_FLT_FN (BUILT_IN_FMA
):
3171 CASE_FLT_FN (BUILT_IN_FMAX
):
3172 CASE_FLT_FN (BUILT_IN_FMIN
):
3173 CASE_FLT_FN (BUILT_IN_FMOD
):
3174 CASE_FLT_FN (BUILT_IN_FREXP
):
3175 CASE_FLT_FN (BUILT_IN_HYPOT
):
3176 CASE_FLT_FN (BUILT_IN_ILOGB
):
3177 CASE_FLT_FN (BUILT_IN_LDEXP
):
3178 CASE_FLT_FN (BUILT_IN_LGAMMA
):
3179 CASE_FLT_FN (BUILT_IN_LLRINT
):
3180 CASE_FLT_FN (BUILT_IN_LLROUND
):
3181 CASE_FLT_FN (BUILT_IN_LOG
):
3182 CASE_FLT_FN (BUILT_IN_LOG10
):
3183 CASE_FLT_FN (BUILT_IN_LOG1P
):
3184 CASE_FLT_FN (BUILT_IN_LOG2
):
3185 CASE_FLT_FN (BUILT_IN_LOGB
):
3186 CASE_FLT_FN (BUILT_IN_LRINT
):
3187 CASE_FLT_FN (BUILT_IN_LROUND
):
3188 CASE_FLT_FN (BUILT_IN_MODF
):
3189 CASE_FLT_FN (BUILT_IN_NAN
):
3190 CASE_FLT_FN (BUILT_IN_NEARBYINT
):
3191 CASE_FLT_FN (BUILT_IN_NEXTAFTER
):
3192 CASE_FLT_FN (BUILT_IN_NEXTTOWARD
):
3193 CASE_FLT_FN (BUILT_IN_POW
):
3194 CASE_FLT_FN (BUILT_IN_REMAINDER
):
3195 CASE_FLT_FN (BUILT_IN_REMQUO
):
3196 CASE_FLT_FN (BUILT_IN_RINT
):
3197 CASE_FLT_FN (BUILT_IN_ROUND
):
3198 CASE_FLT_FN (BUILT_IN_SCALBLN
):
3199 CASE_FLT_FN (BUILT_IN_SCALBN
):
3200 CASE_FLT_FN (BUILT_IN_SIN
):
3201 CASE_FLT_FN (BUILT_IN_SINH
):
3202 CASE_FLT_FN (BUILT_IN_SINCOS
):
3203 CASE_FLT_FN (BUILT_IN_SQRT
):
3204 CASE_FLT_FN (BUILT_IN_TAN
):
3205 CASE_FLT_FN (BUILT_IN_TANH
):
3206 CASE_FLT_FN (BUILT_IN_TGAMMA
):
3207 CASE_FLT_FN (BUILT_IN_TRUNC
):
3208 case BUILT_IN_ISINF
:
3209 case BUILT_IN_ISNAN
:
3211 CASE_FLT_FN (BUILT_IN_CABS
):
3212 CASE_FLT_FN (BUILT_IN_CACOS
):
3213 CASE_FLT_FN (BUILT_IN_CACOSH
):
3214 CASE_FLT_FN (BUILT_IN_CARG
):
3215 CASE_FLT_FN (BUILT_IN_CASIN
):
3216 CASE_FLT_FN (BUILT_IN_CASINH
):
3217 CASE_FLT_FN (BUILT_IN_CATAN
):
3218 CASE_FLT_FN (BUILT_IN_CATANH
):
3219 CASE_FLT_FN (BUILT_IN_CCOS
):
3220 CASE_FLT_FN (BUILT_IN_CCOSH
):
3221 CASE_FLT_FN (BUILT_IN_CEXP
):
3222 CASE_FLT_FN (BUILT_IN_CIMAG
):
3223 CASE_FLT_FN (BUILT_IN_CLOG
):
3224 CASE_FLT_FN (BUILT_IN_CONJ
):
3225 CASE_FLT_FN (BUILT_IN_CPOW
):
3226 CASE_FLT_FN (BUILT_IN_CPROJ
):
3227 CASE_FLT_FN (BUILT_IN_CREAL
):
3228 CASE_FLT_FN (BUILT_IN_CSIN
):
3229 CASE_FLT_FN (BUILT_IN_CSINH
):
3230 CASE_FLT_FN (BUILT_IN_CSQRT
):
3231 CASE_FLT_FN (BUILT_IN_CTAN
):
3232 CASE_FLT_FN (BUILT_IN_CTANH
):
3233 return "<complex.h>";
3234 case BUILT_IN_MEMCHR
:
3235 case BUILT_IN_MEMCMP
:
3236 case BUILT_IN_MEMCPY
:
3237 case BUILT_IN_MEMMOVE
:
3238 case BUILT_IN_MEMSET
:
3239 case BUILT_IN_STRCAT
:
3240 case BUILT_IN_STRCHR
:
3241 case BUILT_IN_STRCMP
:
3242 case BUILT_IN_STRCPY
:
3243 case BUILT_IN_STRCSPN
:
3244 case BUILT_IN_STRLEN
:
3245 case BUILT_IN_STRNCAT
:
3246 case BUILT_IN_STRNCMP
:
3247 case BUILT_IN_STRNCPY
:
3248 case BUILT_IN_STRPBRK
:
3249 case BUILT_IN_STRRCHR
:
3250 case BUILT_IN_STRSPN
:
3251 case BUILT_IN_STRSTR
:
3252 return "<string.h>";
3253 case BUILT_IN_FPRINTF
:
3255 case BUILT_IN_FPUTC
:
3256 case BUILT_IN_FPUTS
:
3257 case BUILT_IN_FSCANF
:
3258 case BUILT_IN_FWRITE
:
3259 case BUILT_IN_PRINTF
:
3260 case BUILT_IN_PUTCHAR
:
3262 case BUILT_IN_SCANF
:
3263 case BUILT_IN_SNPRINTF
:
3264 case BUILT_IN_SPRINTF
:
3265 case BUILT_IN_SSCANF
:
3266 case BUILT_IN_VFPRINTF
:
3267 case BUILT_IN_VFSCANF
:
3268 case BUILT_IN_VPRINTF
:
3269 case BUILT_IN_VSCANF
:
3270 case BUILT_IN_VSNPRINTF
:
3271 case BUILT_IN_VSPRINTF
:
3272 case BUILT_IN_VSSCANF
:
3274 case BUILT_IN_ISALNUM
:
3275 case BUILT_IN_ISALPHA
:
3276 case BUILT_IN_ISBLANK
:
3277 case BUILT_IN_ISCNTRL
:
3278 case BUILT_IN_ISDIGIT
:
3279 case BUILT_IN_ISGRAPH
:
3280 case BUILT_IN_ISLOWER
:
3281 case BUILT_IN_ISPRINT
:
3282 case BUILT_IN_ISPUNCT
:
3283 case BUILT_IN_ISSPACE
:
3284 case BUILT_IN_ISUPPER
:
3285 case BUILT_IN_ISXDIGIT
:
3286 case BUILT_IN_TOLOWER
:
3287 case BUILT_IN_TOUPPER
:
3289 case BUILT_IN_ISWALNUM
:
3290 case BUILT_IN_ISWALPHA
:
3291 case BUILT_IN_ISWBLANK
:
3292 case BUILT_IN_ISWCNTRL
:
3293 case BUILT_IN_ISWDIGIT
:
3294 case BUILT_IN_ISWGRAPH
:
3295 case BUILT_IN_ISWLOWER
:
3296 case BUILT_IN_ISWPRINT
:
3297 case BUILT_IN_ISWPUNCT
:
3298 case BUILT_IN_ISWSPACE
:
3299 case BUILT_IN_ISWUPPER
:
3300 case BUILT_IN_ISWXDIGIT
:
3301 case BUILT_IN_TOWLOWER
:
3302 case BUILT_IN_TOWUPPER
:
3303 return "<wctype.h>";
3304 case BUILT_IN_ABORT
:
3306 case BUILT_IN_CALLOC
:
3310 case BUILT_IN_LLABS
:
3311 case BUILT_IN_MALLOC
:
3312 case BUILT_IN_REALLOC
:
3313 case BUILT_IN__EXIT2
:
3314 case BUILT_IN_ALIGNED_ALLOC
:
3315 return "<stdlib.h>";
3316 case BUILT_IN_IMAXABS
:
3317 return "<inttypes.h>";
3318 case BUILT_IN_STRFTIME
:
3325 /* Generate an implicit declaration for identifier FUNCTIONID at LOC as a
3326 function of type int (). */
3329 implicitly_declare (location_t loc
, tree functionid
)
3331 struct c_binding
*b
;
3332 tree decl
= NULL_TREE
;
3335 for (b
= I_SYMBOL_BINDING (functionid
); b
; b
= b
->shadowed
)
3337 if (B_IN_SCOPE (b
, external_scope
))
3346 if (TREE_CODE (decl
) != FUNCTION_DECL
)
3349 /* FIXME: Objective-C has weird not-really-builtin functions
3350 which are supposed to be visible automatically. They wind up
3351 in the external scope because they're pushed before the file
3352 scope gets created. Catch this here and rebind them into the
3354 if (!DECL_BUILT_IN (decl
) && DECL_IS_BUILTIN (decl
))
3356 bind (functionid
, decl
, file_scope
,
3357 /*invisible=*/false, /*nested=*/true,
3358 DECL_SOURCE_LOCATION (decl
));
3363 tree newtype
= default_function_type
;
3365 TREE_TYPE (decl
) = b
->u
.type
;
3366 /* Implicit declaration of a function already declared
3367 (somehow) in a different scope, or as a built-in.
3368 If this is the first time this has happened, warn;
3369 then recycle the old declaration but with the new type. */
3370 if (!C_DECL_IMPLICIT (decl
))
3372 implicit_decl_warning (loc
, functionid
, decl
);
3373 C_DECL_IMPLICIT (decl
) = 1;
3375 if (DECL_BUILT_IN (decl
))
3377 newtype
= build_type_attribute_variant (newtype
,
3379 (TREE_TYPE (decl
)));
3380 if (!comptypes (newtype
, TREE_TYPE (decl
)))
3382 bool warned
= warning_at (loc
, 0, "incompatible implicit "
3383 "declaration of built-in "
3384 "function %qD", decl
);
3385 /* See if we can hint which header to include. */
3387 = header_for_builtin_fn (DECL_FUNCTION_CODE (decl
));
3388 if (header
!= NULL
&& warned
)
3390 rich_location
richloc (line_table
, loc
);
3391 maybe_add_include_fixit (&richloc
, header
);
3394 "include %qs or provide a declaration of %qD",
3397 newtype
= TREE_TYPE (decl
);
3402 if (!comptypes (newtype
, TREE_TYPE (decl
)))
3404 error_at (loc
, "incompatible implicit declaration of "
3405 "function %qD", decl
);
3406 locate_old_decl (decl
);
3409 b
->u
.type
= TREE_TYPE (decl
);
3410 TREE_TYPE (decl
) = newtype
;
3411 bind (functionid
, decl
, current_scope
,
3412 /*invisible=*/false, /*nested=*/true,
3413 DECL_SOURCE_LOCATION (decl
));
3418 /* Not seen before. */
3419 decl
= build_decl (loc
, FUNCTION_DECL
, functionid
, default_function_type
);
3420 DECL_EXTERNAL (decl
) = 1;
3421 TREE_PUBLIC (decl
) = 1;
3422 C_DECL_IMPLICIT (decl
) = 1;
3423 implicit_decl_warning (loc
, functionid
, 0);
3424 asmspec_tree
= maybe_apply_renaming_pragma (decl
, /*asmname=*/NULL
);
3426 set_user_assembler_name (decl
, TREE_STRING_POINTER (asmspec_tree
));
3428 /* C89 says implicit declarations are in the innermost block.
3429 So we record the decl in the standard fashion. */
3430 decl
= pushdecl (decl
);
3432 /* No need to call objc_check_decl here - it's a function type. */
3433 rest_of_decl_compilation (decl
, 0, 0);
3435 /* Write a record describing this implicit function declaration
3436 to the prototypes file (if requested). */
3437 gen_aux_info_record (decl
, 0, 1, 0);
3439 /* Possibly apply some default attributes to this implicit declaration. */
3440 decl_attributes (&decl
, NULL_TREE
, 0);
3445 /* Issue an error message for a reference to an undeclared variable
3446 ID, including a reference to a builtin outside of function-call
3447 context. Establish a binding of the identifier to error_mark_node
3448 in an appropriate scope, which will suppress further errors for the
3449 same identifier. The error message should be given location LOC. */
3451 undeclared_variable (location_t loc
, tree id
)
3453 static bool already
= false;
3454 struct c_scope
*scope
;
3456 if (current_function_decl
== NULL_TREE
)
3458 const char *guessed_id
= lookup_name_fuzzy (id
, FUZZY_LOOKUP_NAME
);
3461 gcc_rich_location
richloc (loc
);
3462 richloc
.add_fixit_replace (guessed_id
);
3463 error_at_rich_loc (&richloc
,
3464 "%qE undeclared here (not in a function);"
3465 " did you mean %qs?",
3469 error_at (loc
, "%qE undeclared here (not in a function)", id
);
3470 scope
= current_scope
;
3474 if (!objc_diagnose_private_ivar (id
))
3476 const char *guessed_id
= lookup_name_fuzzy (id
, FUZZY_LOOKUP_NAME
);
3479 gcc_rich_location
richloc (loc
);
3480 richloc
.add_fixit_replace (guessed_id
);
3483 "%qE undeclared (first use in this function);"
3484 " did you mean %qs?",
3488 error_at (loc
, "%qE undeclared (first use in this function)", id
);
3492 inform (loc
, "each undeclared identifier is reported only"
3493 " once for each function it appears in");
3497 /* If we are parsing old-style parameter decls, current_function_decl
3498 will be nonnull but current_function_scope will be null. */
3499 scope
= current_function_scope
? current_function_scope
: current_scope
;
3501 bind (id
, error_mark_node
, scope
, /*invisible=*/false, /*nested=*/false,
3505 /* Subroutine of lookup_label, declare_label, define_label: construct a
3506 LABEL_DECL with all the proper frills. Also create a struct
3507 c_label_vars initialized for the current scope. */
3510 make_label (location_t location
, tree name
, bool defining
,
3511 struct c_label_vars
**p_label_vars
)
3513 tree label
= build_decl (location
, LABEL_DECL
, name
, void_type_node
);
3514 DECL_CONTEXT (label
) = current_function_decl
;
3515 SET_DECL_MODE (label
, VOIDmode
);
3517 c_label_vars
*label_vars
= ggc_alloc
<c_label_vars
> ();
3518 label_vars
->shadowed
= NULL
;
3519 set_spot_bindings (&label_vars
->label_bindings
, defining
);
3520 label_vars
->decls_in_scope
= make_tree_vector ();
3521 label_vars
->gotos
= NULL
;
3522 *p_label_vars
= label_vars
;
3527 /* Get the LABEL_DECL corresponding to identifier NAME as a label.
3528 Create one if none exists so far for the current function.
3529 This is called when a label is used in a goto expression or
3530 has its address taken. */
3533 lookup_label (tree name
)
3536 struct c_label_vars
*label_vars
;
3538 if (current_function_scope
== 0)
3540 error ("label %qE referenced outside of any function", name
);
3544 /* Use a label already defined or ref'd with this name, but not if
3545 it is inherited from a containing function and wasn't declared
3547 label
= I_LABEL_DECL (name
);
3548 if (label
&& (DECL_CONTEXT (label
) == current_function_decl
3549 || C_DECLARED_LABEL_FLAG (label
)))
3551 /* If the label has only been declared, update its apparent
3552 location to point here, for better diagnostics if it
3553 turns out not to have been defined. */
3554 if (DECL_INITIAL (label
) == NULL_TREE
)
3555 DECL_SOURCE_LOCATION (label
) = input_location
;
3559 /* No label binding for that identifier; make one. */
3560 label
= make_label (input_location
, name
, false, &label_vars
);
3562 /* Ordinary labels go in the current function scope. */
3563 bind_label (name
, label
, current_function_scope
, label_vars
);
3568 /* Issue a warning about DECL for a goto statement at GOTO_LOC going
3572 warn_about_goto (location_t goto_loc
, tree label
, tree decl
)
3574 if (variably_modified_type_p (TREE_TYPE (decl
), NULL_TREE
))
3576 "jump into scope of identifier with variably modified type");
3578 warning_at (goto_loc
, OPT_Wjump_misses_init
,
3579 "jump skips variable initialization");
3580 inform (DECL_SOURCE_LOCATION (label
), "label %qD defined here", label
);
3581 inform (DECL_SOURCE_LOCATION (decl
), "%qD declared here", decl
);
3584 /* Look up a label because of a goto statement. This is like
3585 lookup_label, but also issues any appropriate warnings. */
3588 lookup_label_for_goto (location_t loc
, tree name
)
3591 struct c_label_vars
*label_vars
;
3595 label
= lookup_label (name
);
3596 if (label
== NULL_TREE
)
3599 /* If we are jumping to a different function, we can't issue any
3601 if (DECL_CONTEXT (label
) != current_function_decl
)
3603 gcc_assert (C_DECLARED_LABEL_FLAG (label
));
3607 label_vars
= I_LABEL_BINDING (name
)->u
.label
;
3609 /* If the label has not yet been defined, then push this goto on a
3610 list for possible later warnings. */
3611 if (label_vars
->label_bindings
.scope
== NULL
)
3613 c_goto_bindings
*g
= ggc_alloc
<c_goto_bindings
> ();
3616 set_spot_bindings (&g
->goto_bindings
, true);
3617 vec_safe_push (label_vars
->gotos
, g
);
3621 /* If there are any decls in label_vars->decls_in_scope, then this
3622 goto has missed the declaration of the decl. This happens for a
3628 Issue a warning or error. */
3629 FOR_EACH_VEC_SAFE_ELT (label_vars
->decls_in_scope
, ix
, decl
)
3630 warn_about_goto (loc
, label
, decl
);
3632 if (label_vars
->label_bindings
.left_stmt_expr
)
3634 error_at (loc
, "jump into statement expression");
3635 inform (DECL_SOURCE_LOCATION (label
), "label %qD defined here", label
);
3641 /* Make a label named NAME in the current function, shadowing silently
3642 any that may be inherited from containing functions or containing
3643 scopes. This is called for __label__ declarations. */
3646 declare_label (tree name
)
3648 struct c_binding
*b
= I_LABEL_BINDING (name
);
3650 struct c_label_vars
*label_vars
;
3652 /* Check to make sure that the label hasn't already been declared
3654 if (b
&& B_IN_CURRENT_SCOPE (b
))
3656 error ("duplicate label declaration %qE", name
);
3657 locate_old_decl (b
->decl
);
3659 /* Just use the previous declaration. */
3663 label
= make_label (input_location
, name
, false, &label_vars
);
3664 C_DECLARED_LABEL_FLAG (label
) = 1;
3666 /* Declared labels go in the current scope. */
3667 bind_label (name
, label
, current_scope
, label_vars
);
3672 /* When we define a label, issue any appropriate warnings if there are
3673 any gotos earlier in the function which jump to this label. */
3676 check_earlier_gotos (tree label
, struct c_label_vars
* label_vars
)
3679 struct c_goto_bindings
*g
;
3681 FOR_EACH_VEC_SAFE_ELT (label_vars
->gotos
, ix
, g
)
3683 struct c_binding
*b
;
3684 struct c_scope
*scope
;
3686 /* We have a goto to this label. The goto is going forward. In
3687 g->scope, the goto is going to skip any binding which was
3688 defined after g->bindings_in_scope. */
3689 if (g
->goto_bindings
.scope
->has_jump_unsafe_decl
)
3691 for (b
= g
->goto_bindings
.scope
->bindings
;
3692 b
!= g
->goto_bindings
.bindings_in_scope
;
3695 if (decl_jump_unsafe (b
->decl
))
3696 warn_about_goto (g
->loc
, label
, b
->decl
);
3700 /* We also need to warn about decls defined in any scopes
3701 between the scope of the label and the scope of the goto. */
3702 for (scope
= label_vars
->label_bindings
.scope
;
3703 scope
!= g
->goto_bindings
.scope
;
3704 scope
= scope
->outer
)
3706 gcc_assert (scope
!= NULL
);
3707 if (scope
->has_jump_unsafe_decl
)
3709 if (scope
== label_vars
->label_bindings
.scope
)
3710 b
= label_vars
->label_bindings
.bindings_in_scope
;
3712 b
= scope
->bindings
;
3713 for (; b
!= NULL
; b
= b
->prev
)
3715 if (decl_jump_unsafe (b
->decl
))
3716 warn_about_goto (g
->loc
, label
, b
->decl
);
3721 if (g
->goto_bindings
.stmt_exprs
> 0)
3723 error_at (g
->loc
, "jump into statement expression");
3724 inform (DECL_SOURCE_LOCATION (label
), "label %qD defined here",
3729 /* Now that the label is defined, we will issue warnings about
3730 subsequent gotos to this label when we see them. */
3731 vec_safe_truncate (label_vars
->gotos
, 0);
3732 label_vars
->gotos
= NULL
;
3735 /* Define a label, specifying the location in the source file.
3736 Return the LABEL_DECL node for the label, if the definition is valid.
3737 Otherwise return NULL_TREE. */
3740 define_label (location_t location
, tree name
)
3742 /* Find any preexisting label with this name. It is an error
3743 if that label has already been defined in this function, or
3744 if there is a containing function with a declared label with
3746 tree label
= I_LABEL_DECL (name
);
3749 && ((DECL_CONTEXT (label
) == current_function_decl
3750 && DECL_INITIAL (label
) != NULL_TREE
)
3751 || (DECL_CONTEXT (label
) != current_function_decl
3752 && C_DECLARED_LABEL_FLAG (label
))))
3754 error_at (location
, "duplicate label %qD", label
);
3755 locate_old_decl (label
);
3758 else if (label
&& DECL_CONTEXT (label
) == current_function_decl
)
3760 struct c_label_vars
*label_vars
= I_LABEL_BINDING (name
)->u
.label
;
3762 /* The label has been used or declared already in this function,
3763 but not defined. Update its location to point to this
3765 DECL_SOURCE_LOCATION (label
) = location
;
3766 set_spot_bindings (&label_vars
->label_bindings
, true);
3768 /* Issue warnings as required about any goto statements from
3769 earlier in the function. */
3770 check_earlier_gotos (label
, label_vars
);
3774 struct c_label_vars
*label_vars
;
3776 /* No label binding for that identifier; make one. */
3777 label
= make_label (location
, name
, true, &label_vars
);
3779 /* Ordinary labels go in the current function scope. */
3780 bind_label (name
, label
, current_function_scope
, label_vars
);
3783 if (!in_system_header_at (input_location
) && lookup_name (name
))
3784 warning_at (location
, OPT_Wtraditional
,
3785 "traditional C lacks a separate namespace "
3786 "for labels, identifier %qE conflicts", name
);
3788 /* Mark label as having been defined. */
3789 DECL_INITIAL (label
) = error_mark_node
;
3793 /* Get the bindings for a new switch statement. This is used to issue
3794 warnings as appropriate for jumps from the switch to case or
3797 struct c_spot_bindings
*
3798 c_get_switch_bindings (void)
3800 struct c_spot_bindings
*switch_bindings
;
3802 switch_bindings
= XNEW (struct c_spot_bindings
);
3803 set_spot_bindings (switch_bindings
, true);
3804 return switch_bindings
;
3808 c_release_switch_bindings (struct c_spot_bindings
*bindings
)
3810 gcc_assert (bindings
->stmt_exprs
== 0 && !bindings
->left_stmt_expr
);
3814 /* This is called at the point of a case or default label to issue
3815 warnings about decls as needed. It returns true if it found an
3816 error, not just a warning. */
3819 c_check_switch_jump_warnings (struct c_spot_bindings
*switch_bindings
,
3820 location_t switch_loc
, location_t case_loc
)
3823 struct c_scope
*scope
;
3826 for (scope
= current_scope
;
3827 scope
!= switch_bindings
->scope
;
3828 scope
= scope
->outer
)
3830 struct c_binding
*b
;
3832 gcc_assert (scope
!= NULL
);
3834 if (!scope
->has_jump_unsafe_decl
)
3837 for (b
= scope
->bindings
; b
!= NULL
; b
= b
->prev
)
3839 if (decl_jump_unsafe (b
->decl
))
3841 if (variably_modified_type_p (TREE_TYPE (b
->decl
), NULL_TREE
))
3845 ("switch jumps into scope of identifier with "
3846 "variably modified type"));
3849 warning_at (case_loc
, OPT_Wjump_misses_init
,
3850 "switch jumps over variable initialization");
3851 inform (switch_loc
, "switch starts here");
3852 inform (DECL_SOURCE_LOCATION (b
->decl
), "%qD declared here",
3858 if (switch_bindings
->stmt_exprs
> 0)
3861 error_at (case_loc
, "switch jumps into statement expression");
3862 inform (switch_loc
, "switch starts here");
3868 /* Given NAME, an IDENTIFIER_NODE,
3869 return the structure (or union or enum) definition for that name.
3870 If THISLEVEL_ONLY is nonzero, searches only the current_scope.
3871 CODE says which kind of type the caller wants;
3872 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
3873 If PLOC is not NULL and this returns non-null, it sets *PLOC to the
3874 location where the tag was defined.
3875 If the wrong kind of type is found, an error is reported. */
3878 lookup_tag (enum tree_code code
, tree name
, bool thislevel_only
,
3881 struct c_binding
*b
= I_TAG_BINDING (name
);
3882 bool thislevel
= false;
3887 /* We only care about whether it's in this level if
3888 thislevel_only was set or it might be a type clash. */
3889 if (thislevel_only
|| TREE_CODE (b
->decl
) != code
)
3891 /* For our purposes, a tag in the external scope is the same as
3892 a tag in the file scope. (Primarily relevant to Objective-C
3893 and its builtin structure tags, which get pushed before the
3894 file scope is created.) */
3895 if (B_IN_CURRENT_SCOPE (b
)
3896 || (current_scope
== file_scope
&& B_IN_EXTERNAL_SCOPE (b
)))
3900 if (thislevel_only
&& !thislevel
)
3903 if (TREE_CODE (b
->decl
) != code
)
3905 /* Definition isn't the kind we were looking for. */
3906 pending_invalid_xref
= name
;
3907 pending_invalid_xref_location
= input_location
;
3909 /* If in the same binding level as a declaration as a tag
3910 of a different type, this must not be allowed to
3911 shadow that tag, so give the error immediately.
3912 (For example, "struct foo; union foo;" is invalid.) */
3914 pending_xref_error ();
3923 /* Return true if a definition exists for NAME with code CODE. */
3926 tag_exists_p (enum tree_code code
, tree name
)
3928 struct c_binding
*b
= I_TAG_BINDING (name
);
3930 if (b
== NULL
|| b
->decl
== NULL_TREE
)
3932 return TREE_CODE (b
->decl
) == code
;
3935 /* Print an error message now
3936 for a recent invalid struct, union or enum cross reference.
3937 We don't print them immediately because they are not invalid
3938 when used in the `struct foo;' construct for shadowing. */
3941 pending_xref_error (void)
3943 if (pending_invalid_xref
!= NULL_TREE
)
3944 error_at (pending_invalid_xref_location
, "%qE defined as wrong kind of tag",
3945 pending_invalid_xref
);
3946 pending_invalid_xref
= NULL_TREE
;
3950 /* Look up NAME in the current scope and its superiors
3951 in the namespace of variables, functions and typedefs.
3952 Return a ..._DECL node of some kind representing its definition,
3953 or return NULL_TREE if it is undefined. */
3956 lookup_name (tree name
)
3958 struct c_binding
*b
= I_SYMBOL_BINDING (name
);
3959 if (b
&& !b
->invisible
)
3961 maybe_record_typedef_use (b
->decl
);
3967 /* Similar to `lookup_name' but look only at the indicated scope. */
3970 lookup_name_in_scope (tree name
, struct c_scope
*scope
)
3972 struct c_binding
*b
;
3974 for (b
= I_SYMBOL_BINDING (name
); b
; b
= b
->shadowed
)
3975 if (B_IN_SCOPE (b
, scope
))
3980 /* Look for the closest match for NAME within the currently valid
3983 This finds the identifier with the lowest Levenshtein distance to
3984 NAME. If there are multiple candidates with equal minimal distance,
3985 the first one found is returned. Scopes are searched from innermost
3986 outwards, and within a scope in reverse order of declaration, thus
3987 benefiting candidates "near" to the current scope.
3989 The function also looks for similar macro names to NAME, since a
3990 misspelled macro name will not be expanded, and hence looks like an
3991 identifier to the C frontend.
3993 It also looks for start_typename keywords, to detect "singed" vs "signed"
3997 lookup_name_fuzzy (tree name
, enum lookup_name_fuzzy_kind kind
)
3999 gcc_assert (TREE_CODE (name
) == IDENTIFIER_NODE
);
4001 best_match
<tree
, tree
> bm (name
);
4003 /* Look within currently valid scopes. */
4004 for (c_scope
*scope
= current_scope
; scope
; scope
= scope
->outer
)
4005 for (c_binding
*binding
= scope
->bindings
; binding
; binding
= binding
->prev
)
4007 if (!binding
->id
|| binding
->invisible
)
4009 /* Don't use bindings from implicitly declared functions,
4010 as they were likely misspellings themselves. */
4011 if (TREE_CODE (binding
->decl
) == FUNCTION_DECL
)
4012 if (C_DECL_IMPLICIT (binding
->decl
))
4016 case FUZZY_LOOKUP_TYPENAME
:
4017 if (TREE_CODE (binding
->decl
) != TYPE_DECL
)
4021 case FUZZY_LOOKUP_FUNCTION_NAME
:
4022 if (TREE_CODE (binding
->decl
) != FUNCTION_DECL
)
4024 /* Allow function pointers. */
4025 if ((VAR_P (binding
->decl
)
4026 || TREE_CODE (binding
->decl
) == PARM_DECL
)
4027 && TREE_CODE (TREE_TYPE (binding
->decl
)) == POINTER_TYPE
4028 && (TREE_CODE (TREE_TYPE (TREE_TYPE (binding
->decl
)))
4038 bm
.consider (binding
->id
);
4041 /* Consider macros: if the user misspelled a macro name e.g. "SOME_MACRO"
4043 x = SOME_OTHER_MACRO (y);
4044 then "SOME_OTHER_MACRO" will survive to the frontend and show up
4045 as a misspelled identifier.
4047 Use the best distance so far so that a candidate is only set if
4048 a macro is better than anything so far. This allows early rejection
4049 (without calculating the edit distance) of macro names that must have
4050 distance >= bm.get_best_distance (), and means that we only get a
4051 non-NULL result for best_macro_match if it's better than any of
4052 the identifiers already checked, which avoids needless creation
4053 of identifiers for macro hashnodes. */
4054 best_macro_match
bmm (name
, bm
.get_best_distance (), parse_in
);
4055 cpp_hashnode
*best_macro
= bmm
.get_best_meaningful_candidate ();
4056 /* If a macro is the closest so far to NAME, use it, creating an
4057 identifier tree node for it. */
4060 const char *id
= (const char *)best_macro
->ident
.str
;
4061 tree macro_as_identifier
4062 = get_identifier_with_length (id
, best_macro
->ident
.len
);
4063 bm
.set_best_so_far (macro_as_identifier
,
4064 bmm
.get_best_distance (),
4065 bmm
.get_best_candidate_length ());
4068 /* Try the "start_typename" keywords to detect
4069 "singed" vs "signed" typos. */
4070 if (kind
== FUZZY_LOOKUP_TYPENAME
)
4072 for (unsigned i
= 0; i
< num_c_common_reswords
; i
++)
4074 const c_common_resword
*resword
= &c_common_reswords
[i
];
4075 if (!c_keyword_starts_typename (resword
->rid
))
4077 tree resword_identifier
= ridpointers
[resword
->rid
];
4078 if (!resword_identifier
)
4080 gcc_assert (TREE_CODE (resword_identifier
) == IDENTIFIER_NODE
);
4081 bm
.consider (resword_identifier
);
4085 tree best
= bm
.get_best_meaningful_candidate ();
4087 return IDENTIFIER_POINTER (best
);
4093 /* Create the predefined scalar types of C,
4094 and some nodes representing standard constants (0, 1, (void *) 0).
4095 Initialize the global scope.
4096 Make definitions for built-in primitive functions. */
4099 c_init_decl_processing (void)
4101 location_t save_loc
= input_location
;
4103 /* Initialize reserved words for parser. */
4106 current_function_decl
= NULL_TREE
;
4108 gcc_obstack_init (&parser_obstack
);
4110 /* Make the externals scope. */
4112 external_scope
= current_scope
;
4114 /* Declarations from c_common_nodes_and_builtins must not be associated
4115 with this input file, lest we get differences between using and not
4116 using preprocessed headers. */
4117 input_location
= BUILTINS_LOCATION
;
4119 c_common_nodes_and_builtins ();
4121 /* In C, comparisons and TRUTH_* expressions have type int. */
4122 truthvalue_type_node
= integer_type_node
;
4123 truthvalue_true_node
= integer_one_node
;
4124 truthvalue_false_node
= integer_zero_node
;
4126 /* Even in C99, which has a real boolean type. */
4127 pushdecl (build_decl (UNKNOWN_LOCATION
, TYPE_DECL
, get_identifier ("_Bool"),
4128 boolean_type_node
));
4130 input_location
= save_loc
;
4132 make_fname_decl
= c_make_fname_decl
;
4133 start_fname_decls ();
4136 /* Create the VAR_DECL at LOC for __FUNCTION__ etc. ID is the name to
4137 give the decl, NAME is the initialization string and TYPE_DEP
4138 indicates whether NAME depended on the type of the function. As we
4139 don't yet implement delayed emission of static data, we mark the
4140 decl as emitted so it is not placed in the output. Anything using
4141 it must therefore pull out the STRING_CST initializer directly.
4145 c_make_fname_decl (location_t loc
, tree id
, int type_dep
)
4147 const char *name
= fname_as_string (type_dep
);
4148 tree decl
, type
, init
;
4149 size_t length
= strlen (name
);
4151 type
= build_array_type (char_type_node
,
4152 build_index_type (size_int (length
)));
4153 type
= c_build_qualified_type (type
, TYPE_QUAL_CONST
);
4155 decl
= build_decl (loc
, VAR_DECL
, id
, type
);
4157 TREE_STATIC (decl
) = 1;
4158 TREE_READONLY (decl
) = 1;
4159 DECL_ARTIFICIAL (decl
) = 1;
4161 init
= build_string (length
+ 1, name
);
4162 free (CONST_CAST (char *, name
));
4163 TREE_TYPE (init
) = type
;
4164 DECL_INITIAL (decl
) = init
;
4166 TREE_USED (decl
) = 1;
4168 if (current_function_decl
4169 /* For invalid programs like this:
4172 const char* p = __FUNCTION__;
4174 the __FUNCTION__ is believed to appear in K&R style function
4175 parameter declarator. In that case we still don't have
4177 && current_function_scope
)
4179 DECL_CONTEXT (decl
) = current_function_decl
;
4180 bind (id
, decl
, current_function_scope
,
4181 /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION
);
4184 finish_decl (decl
, loc
, init
, NULL_TREE
, NULL_TREE
);
4190 c_builtin_function (tree decl
)
4192 tree type
= TREE_TYPE (decl
);
4193 tree id
= DECL_NAME (decl
);
4195 const char *name
= IDENTIFIER_POINTER (id
);
4196 C_DECL_BUILTIN_PROTOTYPE (decl
) = prototype_p (type
);
4198 /* Should never be called on a symbol with a preexisting meaning. */
4199 gcc_assert (!I_SYMBOL_BINDING (id
));
4201 bind (id
, decl
, external_scope
, /*invisible=*/true, /*nested=*/false,
4204 /* Builtins in the implementation namespace are made visible without
4205 needing to be explicitly declared. See push_file_scope. */
4206 if (name
[0] == '_' && (name
[1] == '_' || ISUPPER (name
[1])))
4208 DECL_CHAIN (decl
) = visible_builtins
;
4209 visible_builtins
= decl
;
4216 c_builtin_function_ext_scope (tree decl
)
4218 tree type
= TREE_TYPE (decl
);
4219 tree id
= DECL_NAME (decl
);
4221 const char *name
= IDENTIFIER_POINTER (id
);
4222 C_DECL_BUILTIN_PROTOTYPE (decl
) = prototype_p (type
);
4225 bind (id
, decl
, external_scope
, /*invisible=*/false, /*nested=*/false,
4228 /* Builtins in the implementation namespace are made visible without
4229 needing to be explicitly declared. See push_file_scope. */
4230 if (name
[0] == '_' && (name
[1] == '_' || ISUPPER (name
[1])))
4232 DECL_CHAIN (decl
) = visible_builtins
;
4233 visible_builtins
= decl
;
4239 /* Called when a declaration is seen that contains no names to declare.
4240 If its type is a reference to a structure, union or enum inherited
4241 from a containing scope, shadow that tag name for the current scope
4242 with a forward reference.
4243 If its type defines a new named structure or union
4244 or defines an enum, it is valid but we need not do anything here.
4245 Otherwise, it is an error. */
4248 shadow_tag (const struct c_declspecs
*declspecs
)
4250 shadow_tag_warned (declspecs
, 0);
4253 /* WARNED is 1 if we have done a pedwarn, 2 if we have done a warning,
4256 shadow_tag_warned (const struct c_declspecs
*declspecs
, int warned
)
4258 bool found_tag
= false;
4260 if (declspecs
->type
&& !declspecs
->default_int_p
&& !declspecs
->typedef_p
)
4262 tree value
= declspecs
->type
;
4263 enum tree_code code
= TREE_CODE (value
);
4265 if (code
== RECORD_TYPE
|| code
== UNION_TYPE
|| code
== ENUMERAL_TYPE
)
4266 /* Used to test also that TYPE_SIZE (value) != 0.
4267 That caused warning for `struct foo;' at top level in the file. */
4269 tree name
= TYPE_NAME (value
);
4274 if (declspecs
->restrict_p
)
4276 error ("invalid use of %<restrict%>");
4280 if (name
== NULL_TREE
)
4282 if (warned
!= 1 && code
!= ENUMERAL_TYPE
)
4283 /* Empty unnamed enum OK */
4285 pedwarn (input_location
, 0,
4286 "unnamed struct/union that defines no instances");
4290 else if (declspecs
->typespec_kind
!= ctsk_tagdef
4291 && declspecs
->typespec_kind
!= ctsk_tagfirstref
4292 && declspecs
->storage_class
!= csc_none
)
4295 pedwarn (input_location
, 0,
4296 "empty declaration with storage class specifier "
4297 "does not redeclare tag");
4299 pending_xref_error ();
4301 else if (declspecs
->typespec_kind
!= ctsk_tagdef
4302 && declspecs
->typespec_kind
!= ctsk_tagfirstref
4303 && (declspecs
->const_p
4304 || declspecs
->volatile_p
4305 || declspecs
->atomic_p
4306 || declspecs
->restrict_p
4307 || declspecs
->address_space
))
4310 pedwarn (input_location
, 0,
4311 "empty declaration with type qualifier "
4312 "does not redeclare tag");
4314 pending_xref_error ();
4316 else if (declspecs
->typespec_kind
!= ctsk_tagdef
4317 && declspecs
->typespec_kind
!= ctsk_tagfirstref
4318 && declspecs
->alignas_p
)
4321 pedwarn (input_location
, 0,
4322 "empty declaration with %<_Alignas%> "
4323 "does not redeclare tag");
4325 pending_xref_error ();
4329 pending_invalid_xref
= NULL_TREE
;
4330 t
= lookup_tag (code
, name
, true, NULL
);
4334 t
= make_node (code
);
4335 pushtag (input_location
, name
, t
);
4341 if (warned
!= 1 && !in_system_header_at (input_location
))
4343 pedwarn (input_location
, 0,
4344 "useless type name in empty declaration");
4349 else if (warned
!= 1 && !in_system_header_at (input_location
)
4350 && declspecs
->typedef_p
)
4352 pedwarn (input_location
, 0, "useless type name in empty declaration");
4356 pending_invalid_xref
= NULL_TREE
;
4358 if (declspecs
->inline_p
)
4360 error ("%<inline%> in empty declaration");
4364 if (declspecs
->noreturn_p
)
4366 error ("%<_Noreturn%> in empty declaration");
4370 if (current_scope
== file_scope
&& declspecs
->storage_class
== csc_auto
)
4372 error ("%<auto%> in file-scope empty declaration");
4376 if (current_scope
== file_scope
&& declspecs
->storage_class
== csc_register
)
4378 error ("%<register%> in file-scope empty declaration");
4382 if (!warned
&& !in_system_header_at (input_location
)
4383 && declspecs
->storage_class
!= csc_none
)
4385 warning (0, "useless storage class specifier in empty declaration");
4389 if (!warned
&& !in_system_header_at (input_location
) && declspecs
->thread_p
)
4391 warning (0, "useless %qs in empty declaration",
4392 declspecs
->thread_gnu_p
? "__thread" : "_Thread_local");
4397 && !in_system_header_at (input_location
)
4398 && (declspecs
->const_p
4399 || declspecs
->volatile_p
4400 || declspecs
->atomic_p
4401 || declspecs
->restrict_p
4402 || declspecs
->address_space
))
4404 warning (0, "useless type qualifier in empty declaration");
4408 if (!warned
&& !in_system_header_at (input_location
)
4409 && declspecs
->alignas_p
)
4411 warning (0, "useless %<_Alignas%> in empty declaration");
4418 pedwarn (input_location
, 0, "empty declaration");
4423 /* Return the qualifiers from SPECS as a bitwise OR of TYPE_QUAL_*
4424 bits. SPECS represents declaration specifiers that the grammar
4425 only permits to contain type qualifiers and attributes. */
4428 quals_from_declspecs (const struct c_declspecs
*specs
)
4430 int quals
= ((specs
->const_p
? TYPE_QUAL_CONST
: 0)
4431 | (specs
->volatile_p
? TYPE_QUAL_VOLATILE
: 0)
4432 | (specs
->restrict_p
? TYPE_QUAL_RESTRICT
: 0)
4433 | (specs
->atomic_p
? TYPE_QUAL_ATOMIC
: 0)
4434 | (ENCODE_QUAL_ADDR_SPACE (specs
->address_space
)));
4435 gcc_assert (!specs
->type
4436 && !specs
->decl_attr
4437 && specs
->typespec_word
== cts_none
4438 && specs
->storage_class
== csc_none
4439 && !specs
->typedef_p
4440 && !specs
->explicit_signed_p
4441 && !specs
->deprecated_p
4443 && !specs
->long_long_p
4446 && !specs
->unsigned_p
4447 && !specs
->complex_p
4449 && !specs
->noreturn_p
4450 && !specs
->thread_p
);
4454 /* Construct an array declarator. LOC is the location of the
4455 beginning of the array (usually the opening brace). EXPR is the
4456 expression inside [], or NULL_TREE. QUALS are the type qualifiers
4457 inside the [] (to be applied to the pointer to which a parameter
4458 array is converted). STATIC_P is true if "static" is inside the
4459 [], false otherwise. VLA_UNSPEC_P is true if the array is [*], a
4460 VLA of unspecified length which is nevertheless a complete type,
4461 false otherwise. The field for the contained declarator is left to
4462 be filled in by set_array_declarator_inner. */
4464 struct c_declarator
*
4465 build_array_declarator (location_t loc
,
4466 tree expr
, struct c_declspecs
*quals
, bool static_p
,
4469 struct c_declarator
*declarator
= XOBNEW (&parser_obstack
,
4470 struct c_declarator
);
4471 declarator
->id_loc
= loc
;
4472 declarator
->kind
= cdk_array
;
4473 declarator
->declarator
= 0;
4474 declarator
->u
.array
.dimen
= expr
;
4477 declarator
->u
.array
.attrs
= quals
->attrs
;
4478 declarator
->u
.array
.quals
= quals_from_declspecs (quals
);
4482 declarator
->u
.array
.attrs
= NULL_TREE
;
4483 declarator
->u
.array
.quals
= 0;
4485 declarator
->u
.array
.static_p
= static_p
;
4486 declarator
->u
.array
.vla_unspec_p
= vla_unspec_p
;
4487 if (static_p
|| quals
!= NULL
)
4488 pedwarn_c90 (loc
, OPT_Wpedantic
,
4489 "ISO C90 does not support %<static%> or type "
4490 "qualifiers in parameter array declarators");
4492 pedwarn_c90 (loc
, OPT_Wpedantic
,
4493 "ISO C90 does not support %<[*]%> array declarators");
4496 if (!current_scope
->parm_flag
)
4499 error_at (loc
, "%<[*]%> not allowed in other than "
4500 "function prototype scope");
4501 declarator
->u
.array
.vla_unspec_p
= false;
4504 current_scope
->had_vla_unspec
= true;
4509 /* Set the contained declarator of an array declarator. DECL is the
4510 declarator, as constructed by build_array_declarator; INNER is what
4511 appears on the left of the []. */
4513 struct c_declarator
*
4514 set_array_declarator_inner (struct c_declarator
*decl
,
4515 struct c_declarator
*inner
)
4517 decl
->declarator
= inner
;
4521 /* INIT is a constructor that forms DECL's initializer. If the final
4522 element initializes a flexible array field, add the size of that
4523 initializer to DECL's size. */
4526 add_flexible_array_elts_to_size (tree decl
, tree init
)
4530 if (vec_safe_is_empty (CONSTRUCTOR_ELTS (init
)))
4533 elt
= CONSTRUCTOR_ELTS (init
)->last ().value
;
4534 type
= TREE_TYPE (elt
);
4535 if (TREE_CODE (type
) == ARRAY_TYPE
4536 && TYPE_SIZE (type
) == NULL_TREE
4537 && TYPE_DOMAIN (type
) != NULL_TREE
4538 && TYPE_MAX_VALUE (TYPE_DOMAIN (type
)) == NULL_TREE
)
4540 complete_array_type (&type
, elt
, false);
4542 = size_binop (PLUS_EXPR
, DECL_SIZE (decl
), TYPE_SIZE (type
));
4543 DECL_SIZE_UNIT (decl
)
4544 = size_binop (PLUS_EXPR
, DECL_SIZE_UNIT (decl
), TYPE_SIZE_UNIT (type
));
4548 /* Decode a "typename", such as "int **", returning a ..._TYPE node.
4549 Set *EXPR, if EXPR not NULL, to any expression to be evaluated
4550 before the type name, and set *EXPR_CONST_OPERANDS, if
4551 EXPR_CONST_OPERANDS not NULL, to indicate whether the type name may
4552 appear in a constant expression. */
4555 groktypename (struct c_type_name
*type_name
, tree
*expr
,
4556 bool *expr_const_operands
)
4559 tree attrs
= type_name
->specs
->attrs
;
4561 type_name
->specs
->attrs
= NULL_TREE
;
4563 type
= grokdeclarator (type_name
->declarator
, type_name
->specs
, TYPENAME
,
4564 false, NULL
, &attrs
, expr
, expr_const_operands
,
4567 /* Apply attributes. */
4568 decl_attributes (&type
, attrs
, 0);
4573 /* Wrapper for decl_attributes that adds some implicit attributes
4574 to VAR_DECLs or FUNCTION_DECLs. */
4577 c_decl_attributes (tree
*node
, tree attributes
, int flags
)
4579 /* Add implicit "omp declare target" attribute if requested. */
4580 if (current_omp_declare_target_attribute
4581 && ((VAR_P (*node
) && is_global_var (*node
))
4582 || TREE_CODE (*node
) == FUNCTION_DECL
))
4585 && !lang_hooks
.types
.omp_mappable_type (TREE_TYPE (*node
)))
4586 error ("%q+D in declare target directive does not have mappable type",
4589 attributes
= tree_cons (get_identifier ("omp declare target"),
4590 NULL_TREE
, attributes
);
4592 return decl_attributes (node
, attributes
, flags
);
4596 /* Decode a declarator in an ordinary declaration or data definition.
4597 This is called as soon as the type information and variable name
4598 have been parsed, before parsing the initializer if any.
4599 Here we create the ..._DECL node, fill in its type,
4600 and put it on the list of decls for the current context.
4601 The ..._DECL node is returned as the value.
4603 Exception: for arrays where the length is not specified,
4604 the type is left null, to be filled in by `finish_decl'.
4606 Function definitions do not come here; they go to start_function
4607 instead. However, external and forward declarations of functions
4608 do go through here. Structure field declarations are done by
4609 grokfield and not through here. */
4612 start_decl (struct c_declarator
*declarator
, struct c_declspecs
*declspecs
,
4613 bool initialized
, tree attributes
)
4617 tree expr
= NULL_TREE
;
4618 enum deprecated_states deprecated_state
= DEPRECATED_NORMAL
;
4620 /* An object declared as __attribute__((deprecated)) suppresses
4621 warnings of uses of other deprecated items. */
4622 if (lookup_attribute ("deprecated", attributes
))
4623 deprecated_state
= DEPRECATED_SUPPRESS
;
4625 decl
= grokdeclarator (declarator
, declspecs
,
4626 NORMAL
, initialized
, NULL
, &attributes
, &expr
, NULL
,
4628 if (!decl
|| decl
== error_mark_node
)
4632 add_stmt (fold_convert (void_type_node
, expr
));
4634 if (TREE_CODE (decl
) != FUNCTION_DECL
&& MAIN_NAME_P (DECL_NAME (decl
)))
4635 warning (OPT_Wmain
, "%q+D is usually a function", decl
);
4638 /* Is it valid for this decl to have an initializer at all?
4639 If not, set INITIALIZED to zero, which will indirectly
4640 tell 'finish_decl' to ignore the initializer once it is parsed. */
4641 switch (TREE_CODE (decl
))
4644 error ("typedef %qD is initialized (use __typeof__ instead)", decl
);
4645 initialized
= false;
4649 error ("function %qD is initialized like a variable", decl
);
4650 initialized
= false;
4654 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
4655 error ("parameter %qD is initialized", decl
);
4656 initialized
= false;
4660 /* Don't allow initializations for incomplete types except for
4661 arrays which might be completed by the initialization. */
4663 /* This can happen if the array size is an undefined macro.
4664 We already gave a warning, so we don't need another one. */
4665 if (TREE_TYPE (decl
) == error_mark_node
)
4666 initialized
= false;
4667 else if (COMPLETE_TYPE_P (TREE_TYPE (decl
)))
4669 /* A complete type is ok if size is fixed. */
4671 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl
))) != INTEGER_CST
4672 || C_DECL_VARIABLE_SIZE (decl
))
4674 error ("variable-sized object may not be initialized");
4675 initialized
= false;
4678 else if (TREE_CODE (TREE_TYPE (decl
)) != ARRAY_TYPE
)
4680 error ("variable %qD has initializer but incomplete type", decl
);
4681 initialized
= false;
4683 else if (C_DECL_VARIABLE_SIZE (decl
))
4685 /* Although C99 is unclear about whether incomplete arrays
4686 of VLAs themselves count as VLAs, it does not make
4687 sense to permit them to be initialized given that
4688 ordinary VLAs may not be initialized. */
4689 error ("variable-sized object may not be initialized");
4690 initialized
= false;
4696 if (current_scope
== file_scope
)
4697 TREE_STATIC (decl
) = 1;
4699 /* Tell 'pushdecl' this is an initialized decl
4700 even though we don't yet have the initializer expression.
4701 Also tell 'finish_decl' it may store the real initializer. */
4702 DECL_INITIAL (decl
) = error_mark_node
;
4705 /* If this is a function declaration, write a record describing it to the
4706 prototypes file (if requested). */
4708 if (TREE_CODE (decl
) == FUNCTION_DECL
)
4709 gen_aux_info_record (decl
, 0, 0, prototype_p (TREE_TYPE (decl
)));
4711 /* ANSI specifies that a tentative definition which is not merged with
4712 a non-tentative definition behaves exactly like a definition with an
4713 initializer equal to zero. (Section 3.7.2)
4715 -fno-common gives strict ANSI behavior, though this tends to break
4716 a large body of code that grew up without this rule.
4718 Thread-local variables are never common, since there's no entrenched
4719 body of code to break, and it allows more efficient variable references
4720 in the presence of dynamic linking. */
4724 && TREE_PUBLIC (decl
)
4725 && !DECL_THREAD_LOCAL_P (decl
)
4727 DECL_COMMON (decl
) = 1;
4729 /* Set attributes here so if duplicate decl, will have proper attributes. */
4730 c_decl_attributes (&decl
, attributes
, 0);
4732 /* Handle gnu_inline attribute. */
4733 if (declspecs
->inline_p
4734 && !flag_gnu89_inline
4735 && TREE_CODE (decl
) == FUNCTION_DECL
4736 && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl
))
4737 || current_function_decl
))
4739 if (declspecs
->storage_class
== csc_auto
&& current_scope
!= file_scope
)
4741 else if (declspecs
->storage_class
!= csc_static
)
4742 DECL_EXTERNAL (decl
) = !DECL_EXTERNAL (decl
);
4745 if (TREE_CODE (decl
) == FUNCTION_DECL
4746 && targetm
.calls
.promote_prototypes (TREE_TYPE (decl
)))
4748 struct c_declarator
*ce
= declarator
;
4750 if (ce
->kind
== cdk_pointer
)
4751 ce
= declarator
->declarator
;
4752 if (ce
->kind
== cdk_function
)
4754 tree args
= ce
->u
.arg_info
->parms
;
4755 for (; args
; args
= DECL_CHAIN (args
))
4757 tree type
= TREE_TYPE (args
);
4758 if (type
&& INTEGRAL_TYPE_P (type
)
4759 && TYPE_PRECISION (type
) < TYPE_PRECISION (integer_type_node
))
4760 DECL_ARG_TYPE (args
) = c_type_promotes_to (type
);
4765 if (TREE_CODE (decl
) == FUNCTION_DECL
4766 && DECL_DECLARED_INLINE_P (decl
)
4767 && DECL_UNINLINABLE (decl
)
4768 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl
)))
4769 warning (OPT_Wattributes
, "inline function %q+D given attribute noinline",
4772 /* C99 6.7.4p3: An inline definition of a function with external
4773 linkage shall not contain a definition of a modifiable object
4774 with static storage duration... */
4776 && current_scope
!= file_scope
4777 && TREE_STATIC (decl
)
4778 && !TREE_READONLY (decl
)
4779 && DECL_DECLARED_INLINE_P (current_function_decl
)
4780 && DECL_EXTERNAL (current_function_decl
))
4781 record_inline_static (input_location
, current_function_decl
,
4782 decl
, csi_modifiable
);
4784 if (c_dialect_objc ()
4785 && VAR_OR_FUNCTION_DECL_P (decl
))
4786 objc_check_global_decl (decl
);
4788 /* Add this decl to the current scope.
4789 TEM may equal DECL or it may be a previous decl of the same name. */
4790 tem
= pushdecl (decl
);
4792 if (initialized
&& DECL_EXTERNAL (tem
))
4794 DECL_EXTERNAL (tem
) = 0;
4795 TREE_STATIC (tem
) = 1;
4801 /* Subroutine of finish_decl. TYPE is the type of an uninitialized object
4802 DECL or the non-array element type if DECL is an uninitialized array.
4803 If that type has a const member, diagnose this. */
4806 diagnose_uninitialized_cst_member (tree decl
, tree type
)
4809 for (field
= TYPE_FIELDS (type
); field
; field
= TREE_CHAIN (field
))
4812 if (TREE_CODE (field
) != FIELD_DECL
)
4814 field_type
= strip_array_types (TREE_TYPE (field
));
4816 if (TYPE_QUALS (field_type
) & TYPE_QUAL_CONST
)
4818 warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wc___compat
,
4819 "uninitialized const member in %qT is invalid in C++",
4820 strip_array_types (TREE_TYPE (decl
)));
4821 inform (DECL_SOURCE_LOCATION (field
), "%qD should be initialized", field
);
4824 if (RECORD_OR_UNION_TYPE_P (field_type
))
4825 diagnose_uninitialized_cst_member (decl
, field_type
);
4829 /* Finish processing of a declaration;
4830 install its initial value.
4831 If ORIGTYPE is not NULL_TREE, it is the original type of INIT.
4832 If the length of an array type is not known before,
4833 it must be determined now, from the initial value, or it is an error.
4835 INIT_LOC is the location of the initial value. */
4838 finish_decl (tree decl
, location_t init_loc
, tree init
,
4839 tree origtype
, tree asmspec_tree
)
4842 bool was_incomplete
= (DECL_SIZE (decl
) == NULL_TREE
);
4843 const char *asmspec
= 0;
4845 /* If a name was specified, get the string. */
4846 if (VAR_OR_FUNCTION_DECL_P (decl
)
4847 && DECL_FILE_SCOPE_P (decl
))
4848 asmspec_tree
= maybe_apply_renaming_pragma (decl
, asmspec_tree
);
4850 asmspec
= TREE_STRING_POINTER (asmspec_tree
);
4853 && TREE_STATIC (decl
)
4854 && global_bindings_p ())
4855 /* So decl is a global variable. Record the types it uses
4856 so that we can decide later to emit debug info for them. */
4857 record_types_used_by_current_var_decl (decl
);
4859 /* If `start_decl' didn't like having an initialization, ignore it now. */
4860 if (init
!= NULL_TREE
&& DECL_INITIAL (decl
) == NULL_TREE
)
4863 /* Don't crash if parm is initialized. */
4864 if (TREE_CODE (decl
) == PARM_DECL
)
4868 store_init_value (init_loc
, decl
, init
, origtype
);
4870 if (c_dialect_objc () && (VAR_OR_FUNCTION_DECL_P (decl
)
4871 || TREE_CODE (decl
) == FIELD_DECL
))
4872 objc_check_decl (decl
);
4874 type
= TREE_TYPE (decl
);
4876 /* Deduce size of array from initialization, if not already known. */
4877 if (TREE_CODE (type
) == ARRAY_TYPE
4878 && TYPE_DOMAIN (type
) == NULL_TREE
4879 && TREE_CODE (decl
) != TYPE_DECL
)
4882 = (TREE_STATIC (decl
)
4883 /* Even if pedantic, an external linkage array
4884 may have incomplete type at first. */
4885 ? pedantic
&& !TREE_PUBLIC (decl
)
4886 : !DECL_EXTERNAL (decl
));
4888 = complete_array_type (&TREE_TYPE (decl
), DECL_INITIAL (decl
),
4891 /* Get the completed type made by complete_array_type. */
4892 type
= TREE_TYPE (decl
);
4897 error ("initializer fails to determine size of %q+D", decl
);
4902 error ("array size missing in %q+D", decl
);
4903 /* If a `static' var's size isn't known,
4904 make it extern as well as static, so it does not get
4906 If it is not `static', then do not mark extern;
4907 finish_incomplete_decl will give it a default size
4908 and it will get allocated. */
4909 else if (!pedantic
&& TREE_STATIC (decl
) && !TREE_PUBLIC (decl
))
4910 DECL_EXTERNAL (decl
) = 1;
4914 error ("zero or negative size array %q+D", decl
);
4918 /* For global variables, update the copy of the type that
4919 exists in the binding. */
4920 if (TREE_PUBLIC (decl
))
4922 struct c_binding
*b_ext
= I_SYMBOL_BINDING (DECL_NAME (decl
));
4923 while (b_ext
&& !B_IN_EXTERNAL_SCOPE (b_ext
))
4924 b_ext
= b_ext
->shadowed
;
4925 if (b_ext
&& TREE_CODE (decl
) == TREE_CODE (b_ext
->decl
))
4927 if (b_ext
->u
.type
&& comptypes (b_ext
->u
.type
, type
))
4928 b_ext
->u
.type
= composite_type (b_ext
->u
.type
, type
);
4930 b_ext
->u
.type
= type
;
4939 if (DECL_INITIAL (decl
))
4940 TREE_TYPE (DECL_INITIAL (decl
)) = type
;
4942 relayout_decl (decl
);
4947 if (init
&& TREE_CODE (init
) == CONSTRUCTOR
)
4948 add_flexible_array_elts_to_size (decl
, init
);
4950 if (DECL_SIZE (decl
) == NULL_TREE
&& TREE_TYPE (decl
) != error_mark_node
4951 && COMPLETE_TYPE_P (TREE_TYPE (decl
)))
4952 layout_decl (decl
, 0);
4954 if (DECL_SIZE (decl
) == NULL_TREE
4955 /* Don't give an error if we already gave one earlier. */
4956 && TREE_TYPE (decl
) != error_mark_node
4957 && (TREE_STATIC (decl
)
4958 /* A static variable with an incomplete type
4959 is an error if it is initialized.
4960 Also if it is not file scope.
4961 Otherwise, let it through, but if it is not `extern'
4962 then it may cause an error message later. */
4963 ? (DECL_INITIAL (decl
) != NULL_TREE
4964 || !DECL_FILE_SCOPE_P (decl
))
4965 /* An automatic variable with an incomplete type
4967 : !DECL_EXTERNAL (decl
)))
4969 error ("storage size of %q+D isn%'t known", decl
);
4970 TREE_TYPE (decl
) = error_mark_node
;
4973 if ((RECORD_OR_UNION_TYPE_P (TREE_TYPE (decl
))
4974 || TREE_CODE (TREE_TYPE (decl
)) == ENUMERAL_TYPE
)
4975 && DECL_SIZE (decl
) == NULL_TREE
4976 && TREE_STATIC (decl
))
4977 incomplete_record_decls
.safe_push (decl
);
4979 if (is_global_var (decl
) && DECL_SIZE (decl
) != NULL_TREE
)
4981 if (TREE_CODE (DECL_SIZE (decl
)) == INTEGER_CST
)
4982 constant_expression_warning (DECL_SIZE (decl
));
4985 error ("storage size of %q+D isn%'t constant", decl
);
4986 TREE_TYPE (decl
) = error_mark_node
;
4990 if (TREE_USED (type
))
4992 TREE_USED (decl
) = 1;
4993 DECL_READ_P (decl
) = 1;
4997 /* If this is a function and an assembler name is specified, reset DECL_RTL
4998 so we can give it its new name. Also, update builtin_decl if it
4999 was a normal built-in. */
5000 if (TREE_CODE (decl
) == FUNCTION_DECL
&& asmspec
)
5002 if (DECL_BUILT_IN_CLASS (decl
) == BUILT_IN_NORMAL
)
5003 set_builtin_user_assembler_name (decl
, asmspec
);
5004 set_user_assembler_name (decl
, asmspec
);
5007 /* If #pragma weak was used, mark the decl weak now. */
5008 maybe_apply_pragma_weak (decl
);
5010 /* Output the assembler code and/or RTL code for variables and functions,
5011 unless the type is an undefined structure or union.
5012 If not, it will get done when the type is completed. */
5014 if (VAR_OR_FUNCTION_DECL_P (decl
))
5016 /* Determine the ELF visibility. */
5017 if (TREE_PUBLIC (decl
))
5018 c_determine_visibility (decl
);
5020 /* This is a no-op in c-lang.c or something real in objc-act.c. */
5021 if (c_dialect_objc ())
5022 objc_check_decl (decl
);
5026 /* If this is not a static variable, issue a warning.
5027 It doesn't make any sense to give an ASMSPEC for an
5028 ordinary, non-register local variable. Historically,
5029 GCC has accepted -- but ignored -- the ASMSPEC in
5031 if (!DECL_FILE_SCOPE_P (decl
)
5033 && !C_DECL_REGISTER (decl
)
5034 && !TREE_STATIC (decl
))
5035 warning (0, "ignoring asm-specifier for non-static local "
5036 "variable %q+D", decl
);
5038 set_user_assembler_name (decl
, asmspec
);
5041 if (DECL_FILE_SCOPE_P (decl
))
5043 if (DECL_INITIAL (decl
) == NULL_TREE
5044 || DECL_INITIAL (decl
) == error_mark_node
)
5045 /* Don't output anything
5046 when a tentative file-scope definition is seen.
5047 But at end of compilation, do output code for them. */
5048 DECL_DEFER_OUTPUT (decl
) = 1;
5049 if (asmspec
&& VAR_P (decl
) && C_DECL_REGISTER (decl
))
5050 DECL_HARD_REGISTER (decl
) = 1;
5051 rest_of_decl_compilation (decl
, true, 0);
5055 /* In conjunction with an ASMSPEC, the `register'
5056 keyword indicates that we should place the variable
5057 in a particular register. */
5058 if (asmspec
&& C_DECL_REGISTER (decl
))
5060 DECL_HARD_REGISTER (decl
) = 1;
5061 /* This cannot be done for a structure with volatile
5062 fields, on which DECL_REGISTER will have been
5064 if (!DECL_REGISTER (decl
))
5065 error ("cannot put object with volatile field into register");
5068 if (TREE_CODE (decl
) != FUNCTION_DECL
)
5070 /* If we're building a variable sized type, and we might be
5071 reachable other than via the top of the current binding
5072 level, then create a new BIND_EXPR so that we deallocate
5073 the object at the right time. */
5074 /* Note that DECL_SIZE can be null due to errors. */
5075 if (DECL_SIZE (decl
)
5076 && !TREE_CONSTANT (DECL_SIZE (decl
))
5077 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list
))
5080 bind
= build3 (BIND_EXPR
, void_type_node
, NULL
, NULL
, NULL
);
5081 TREE_SIDE_EFFECTS (bind
) = 1;
5083 BIND_EXPR_BODY (bind
) = push_stmt_list ();
5085 add_stmt (build_stmt (DECL_SOURCE_LOCATION (decl
),
5091 if (!DECL_FILE_SCOPE_P (decl
))
5093 /* Recompute the RTL of a local array now
5094 if it used to be an incomplete type. */
5095 if (was_incomplete
&& !is_global_var (decl
))
5097 /* If we used it already as memory, it must stay in memory. */
5098 TREE_ADDRESSABLE (decl
) = TREE_USED (decl
);
5099 /* If it's still incomplete now, no init will save it. */
5100 if (DECL_SIZE (decl
) == NULL_TREE
)
5101 DECL_INITIAL (decl
) = NULL_TREE
;
5106 if (TREE_CODE (decl
) == TYPE_DECL
)
5108 if (!DECL_FILE_SCOPE_P (decl
)
5109 && variably_modified_type_p (TREE_TYPE (decl
), NULL_TREE
))
5110 add_stmt (build_stmt (DECL_SOURCE_LOCATION (decl
), DECL_EXPR
, decl
));
5112 rest_of_decl_compilation (decl
, DECL_FILE_SCOPE_P (decl
), 0);
5115 /* Install a cleanup (aka destructor) if one was given. */
5116 if (VAR_P (decl
) && !TREE_STATIC (decl
))
5118 tree attr
= lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl
));
5121 tree cleanup_id
= TREE_VALUE (TREE_VALUE (attr
));
5122 tree cleanup_decl
= lookup_name (cleanup_id
);
5124 vec
<tree
, va_gc
> *v
;
5126 /* Build "cleanup(&decl)" for the destructor. */
5127 cleanup
= build_unary_op (input_location
, ADDR_EXPR
, decl
, false);
5129 v
->quick_push (cleanup
);
5130 cleanup
= c_build_function_call_vec (DECL_SOURCE_LOCATION (decl
),
5131 vNULL
, cleanup_decl
, v
, NULL
);
5134 /* Don't warn about decl unused; the cleanup uses it. */
5135 TREE_USED (decl
) = 1;
5136 TREE_USED (cleanup_decl
) = 1;
5137 DECL_READ_P (decl
) = 1;
5139 push_cleanup (decl
, cleanup
, false);
5145 && !DECL_EXTERNAL (decl
)
5146 && DECL_INITIAL (decl
) == NULL_TREE
)
5148 type
= strip_array_types (type
);
5149 if (TREE_READONLY (decl
))
5150 warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wc___compat
,
5151 "uninitialized const %qD is invalid in C++", decl
);
5152 else if (RECORD_OR_UNION_TYPE_P (type
)
5153 && C_TYPE_FIELDS_READONLY (type
))
5154 diagnose_uninitialized_cst_member (decl
, type
);
5157 invoke_plugin_callbacks (PLUGIN_FINISH_DECL
, decl
);
5160 /* Given a parsed parameter declaration, decode it into a PARM_DECL.
5161 EXPR is NULL or a pointer to an expression that needs to be
5162 evaluated for the side effects of array size expressions in the
5166 grokparm (const struct c_parm
*parm
, tree
*expr
)
5168 tree attrs
= parm
->attrs
;
5169 tree decl
= grokdeclarator (parm
->declarator
, parm
->specs
, PARM
, false,
5170 NULL
, &attrs
, expr
, NULL
, DEPRECATED_NORMAL
);
5172 decl_attributes (&decl
, attrs
, 0);
5177 /* Given a parsed parameter declaration, decode it into a PARM_DECL
5178 and push that on the current scope. EXPR is a pointer to an
5179 expression that needs to be evaluated for the side effects of array
5180 size expressions in the parameters. */
5183 push_parm_decl (const struct c_parm
*parm
, tree
*expr
)
5185 tree attrs
= parm
->attrs
;
5188 decl
= grokdeclarator (parm
->declarator
, parm
->specs
, PARM
, false, NULL
,
5189 &attrs
, expr
, NULL
, DEPRECATED_NORMAL
);
5190 decl_attributes (&decl
, attrs
, 0);
5192 decl
= pushdecl (decl
);
5194 finish_decl (decl
, input_location
, NULL_TREE
, NULL_TREE
, NULL_TREE
);
5197 /* Mark all the parameter declarations to date as forward decls.
5198 Also diagnose use of this extension. */
5201 mark_forward_parm_decls (void)
5203 struct c_binding
*b
;
5205 if (pedantic
&& !current_scope
->warned_forward_parm_decls
)
5207 pedwarn (input_location
, OPT_Wpedantic
,
5208 "ISO C forbids forward parameter declarations");
5209 current_scope
->warned_forward_parm_decls
= true;
5212 for (b
= current_scope
->bindings
; b
; b
= b
->prev
)
5213 if (TREE_CODE (b
->decl
) == PARM_DECL
)
5214 TREE_ASM_WRITTEN (b
->decl
) = 1;
5217 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
5218 literal, which may be an incomplete array type completed by the
5219 initializer; INIT is a CONSTRUCTOR at LOC that initializes the compound
5220 literal. NON_CONST is true if the initializers contain something
5221 that cannot occur in a constant expression. */
5224 build_compound_literal (location_t loc
, tree type
, tree init
, bool non_const
)
5226 /* We do not use start_decl here because we have a type, not a declarator;
5227 and do not use finish_decl because the decl should be stored inside
5228 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_EXPR. */
5233 if (type
== error_mark_node
5234 || init
== error_mark_node
)
5235 return error_mark_node
;
5237 decl
= build_decl (loc
, VAR_DECL
, NULL_TREE
, type
);
5238 DECL_EXTERNAL (decl
) = 0;
5239 TREE_PUBLIC (decl
) = 0;
5240 TREE_STATIC (decl
) = (current_scope
== file_scope
);
5241 DECL_CONTEXT (decl
) = current_function_decl
;
5242 TREE_USED (decl
) = 1;
5243 DECL_READ_P (decl
) = 1;
5244 DECL_ARTIFICIAL (decl
) = 1;
5245 DECL_IGNORED_P (decl
) = 1;
5246 TREE_TYPE (decl
) = type
;
5247 TREE_READONLY (decl
) = (TYPE_READONLY (type
)
5248 || (TREE_CODE (type
) == ARRAY_TYPE
5249 && TYPE_READONLY (TREE_TYPE (type
))));
5250 store_init_value (loc
, decl
, init
, NULL_TREE
);
5252 if (TREE_CODE (type
) == ARRAY_TYPE
&& !COMPLETE_TYPE_P (type
))
5254 int failure
= complete_array_type (&TREE_TYPE (decl
),
5255 DECL_INITIAL (decl
), true);
5256 /* If complete_array_type returns 3, it means that the
5257 initial value of the compound literal is empty. Allow it. */
5258 gcc_assert (failure
== 0 || failure
== 3);
5260 type
= TREE_TYPE (decl
);
5261 TREE_TYPE (DECL_INITIAL (decl
)) = type
;
5264 if (type
== error_mark_node
|| !COMPLETE_TYPE_P (type
))
5266 c_incomplete_type_error (loc
, NULL_TREE
, type
);
5267 return error_mark_node
;
5270 stmt
= build_stmt (DECL_SOURCE_LOCATION (decl
), DECL_EXPR
, decl
);
5271 complit
= build1 (COMPOUND_LITERAL_EXPR
, type
, stmt
);
5272 TREE_SIDE_EFFECTS (complit
) = 1;
5274 layout_decl (decl
, 0);
5276 if (TREE_STATIC (decl
))
5278 /* This decl needs a name for the assembler output. */
5279 set_compound_literal_name (decl
);
5280 DECL_DEFER_OUTPUT (decl
) = 1;
5281 DECL_COMDAT (decl
) = 1;
5283 rest_of_decl_compilation (decl
, 1, 0);
5288 complit
= build2 (C_MAYBE_CONST_EXPR
, type
, NULL
, complit
);
5289 C_MAYBE_CONST_EXPR_NON_CONST (complit
) = 1;
5295 /* Check the type of a compound literal. Here we just check that it
5296 is valid for C++. */
5299 check_compound_literal_type (location_t loc
, struct c_type_name
*type_name
)
5302 && (type_name
->specs
->typespec_kind
== ctsk_tagdef
5303 || type_name
->specs
->typespec_kind
== ctsk_tagfirstref
))
5304 warning_at (loc
, OPT_Wc___compat
,
5305 "defining a type in a compound literal is invalid in C++");
5308 /* Determine whether TYPE is a structure with a flexible array member,
5309 or a union containing such a structure (possibly recursively). */
5312 flexible_array_type_p (tree type
)
5315 switch (TREE_CODE (type
))
5318 x
= TYPE_FIELDS (type
);
5321 while (DECL_CHAIN (x
) != NULL_TREE
)
5323 if (TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
5324 && TYPE_SIZE (TREE_TYPE (x
)) == NULL_TREE
5325 && TYPE_DOMAIN (TREE_TYPE (x
)) != NULL_TREE
5326 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x
))) == NULL_TREE
)
5330 for (x
= TYPE_FIELDS (type
); x
!= NULL_TREE
; x
= DECL_CHAIN (x
))
5332 if (flexible_array_type_p (TREE_TYPE (x
)))
5341 /* Performs sanity checks on the TYPE and WIDTH of the bit-field NAME,
5342 replacing with appropriate values if they are invalid. */
5345 check_bitfield_type_and_width (location_t loc
, tree
*type
, tree
*width
,
5349 unsigned int max_width
;
5350 unsigned HOST_WIDE_INT w
;
5351 const char *name
= (orig_name
5352 ? identifier_to_locale (IDENTIFIER_POINTER (orig_name
))
5353 : _("<anonymous>"));
5355 /* Detect and ignore out of range field width and process valid
5357 if (!INTEGRAL_TYPE_P (TREE_TYPE (*width
)))
5359 error_at (loc
, "bit-field %qs width not an integer constant", name
);
5360 *width
= integer_one_node
;
5364 if (TREE_CODE (*width
) != INTEGER_CST
)
5366 *width
= c_fully_fold (*width
, false, NULL
);
5367 if (TREE_CODE (*width
) == INTEGER_CST
)
5368 pedwarn (loc
, OPT_Wpedantic
,
5369 "bit-field %qs width not an integer constant expression",
5372 if (TREE_CODE (*width
) != INTEGER_CST
)
5374 error_at (loc
, "bit-field %qs width not an integer constant", name
);
5375 *width
= integer_one_node
;
5377 constant_expression_warning (*width
);
5378 if (tree_int_cst_sgn (*width
) < 0)
5380 error_at (loc
, "negative width in bit-field %qs", name
);
5381 *width
= integer_one_node
;
5383 else if (integer_zerop (*width
) && orig_name
)
5385 error_at (loc
, "zero width for bit-field %qs", name
);
5386 *width
= integer_one_node
;
5390 /* Detect invalid bit-field type. */
5391 if (TREE_CODE (*type
) != INTEGER_TYPE
5392 && TREE_CODE (*type
) != BOOLEAN_TYPE
5393 && TREE_CODE (*type
) != ENUMERAL_TYPE
)
5395 error_at (loc
, "bit-field %qs has invalid type", name
);
5396 *type
= unsigned_type_node
;
5399 type_mv
= TYPE_MAIN_VARIANT (*type
);
5400 if (!in_system_header_at (input_location
)
5401 && type_mv
!= integer_type_node
5402 && type_mv
!= unsigned_type_node
5403 && type_mv
!= boolean_type_node
)
5404 pedwarn_c90 (loc
, OPT_Wpedantic
,
5405 "type of bit-field %qs is a GCC extension", name
);
5407 max_width
= TYPE_PRECISION (*type
);
5409 if (0 < compare_tree_int (*width
, max_width
))
5411 error_at (loc
, "width of %qs exceeds its type", name
);
5413 *width
= build_int_cst (integer_type_node
, w
);
5416 w
= tree_to_uhwi (*width
);
5418 if (TREE_CODE (*type
) == ENUMERAL_TYPE
)
5420 struct lang_type
*lt
= TYPE_LANG_SPECIFIC (*type
);
5422 || w
< tree_int_cst_min_precision (lt
->enum_min
, TYPE_SIGN (*type
))
5423 || w
< tree_int_cst_min_precision (lt
->enum_max
, TYPE_SIGN (*type
)))
5424 warning_at (loc
, 0, "%qs is narrower than values of its type", name
);
5430 /* Print warning about variable length array if necessary. */
5433 warn_variable_length_array (tree name
, tree size
)
5435 if (TREE_CONSTANT (size
))
5438 pedwarn_c90 (input_location
, OPT_Wvla
,
5439 "ISO C90 forbids array %qE whose size "
5440 "can%'t be evaluated", name
);
5442 pedwarn_c90 (input_location
, OPT_Wvla
, "ISO C90 forbids array "
5443 "whose size can%'t be evaluated");
5448 pedwarn_c90 (input_location
, OPT_Wvla
,
5449 "ISO C90 forbids variable length array %qE", name
);
5451 pedwarn_c90 (input_location
, OPT_Wvla
, "ISO C90 forbids variable "
5456 /* Print warning about defaulting to int if necessary. */
5459 warn_defaults_to (location_t location
, int opt
, const char *gmsgid
, ...)
5461 diagnostic_info diagnostic
;
5463 rich_location
richloc (line_table
, location
);
5465 va_start (ap
, gmsgid
);
5466 diagnostic_set_info (&diagnostic
, gmsgid
, &ap
, &richloc
,
5467 flag_isoc99
? DK_PEDWARN
: DK_WARNING
);
5468 diagnostic
.option_index
= opt
;
5469 diagnostic_report_diagnostic (global_dc
, &diagnostic
);
5473 /* Returns the smallest location != UNKNOWN_LOCATION in LOCATIONS,
5474 considering only those c_declspec_words found in LIST, which
5475 must be terminated by cdw_number_of_elements. */
5478 smallest_type_quals_location (const location_t
*locations
,
5479 const c_declspec_word
*list
)
5481 location_t loc
= UNKNOWN_LOCATION
;
5482 while (*list
!= cdw_number_of_elements
)
5484 location_t newloc
= locations
[*list
];
5485 if (loc
== UNKNOWN_LOCATION
5486 || (newloc
!= UNKNOWN_LOCATION
&& newloc
< loc
))
5494 /* Given declspecs and a declarator,
5495 determine the name and type of the object declared
5496 and construct a ..._DECL node for it.
5497 (In one case we can return a ..._TYPE node instead.
5498 For invalid input we sometimes return NULL_TREE.)
5500 DECLSPECS is a c_declspecs structure for the declaration specifiers.
5502 DECL_CONTEXT says which syntactic context this declaration is in:
5503 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
5504 FUNCDEF for a function definition. Like NORMAL but a few different
5505 error messages in each case. Return value may be zero meaning
5506 this definition is too screwy to try to parse.
5507 PARM for a parameter declaration (either within a function prototype
5508 or before a function body). Make a PARM_DECL, or return void_type_node.
5509 TYPENAME if for a typename (in a cast or sizeof).
5510 Don't make a DECL node; just return the ..._TYPE node.
5511 FIELD for a struct or union field; make a FIELD_DECL.
5512 INITIALIZED is true if the decl has an initializer.
5513 WIDTH is non-NULL for bit-fields, and is a pointer to an INTEGER_CST node
5514 representing the width of the bit-field.
5515 DECL_ATTRS points to the list of attributes that should be added to this
5516 decl. Any nested attributes that belong on the decl itself will be
5518 If EXPR is not NULL, any expressions that need to be evaluated as
5519 part of evaluating variably modified types will be stored in *EXPR.
5520 If EXPR_CONST_OPERANDS is not NULL, *EXPR_CONST_OPERANDS will be
5521 set to indicate whether operands in *EXPR can be used in constant
5523 DEPRECATED_STATE is a deprecated_states value indicating whether
5524 deprecation warnings should be suppressed.
5526 In the TYPENAME case, DECLARATOR is really an absolute declarator.
5527 It may also be so in the PARM case, for a prototype where the
5528 argument type is specified but not the name.
5530 This function is where the complicated C meanings of `static'
5531 and `extern' are interpreted. */
5534 grokdeclarator (const struct c_declarator
*declarator
,
5535 struct c_declspecs
*declspecs
,
5536 enum decl_context decl_context
, bool initialized
, tree
*width
,
5537 tree
*decl_attrs
, tree
*expr
, bool *expr_const_operands
,
5538 enum deprecated_states deprecated_state
)
5540 tree type
= declspecs
->type
;
5541 bool threadp
= declspecs
->thread_p
;
5542 enum c_storage_class storage_class
= declspecs
->storage_class
;
5547 int type_quals
= TYPE_UNQUALIFIED
;
5548 tree name
= NULL_TREE
;
5549 bool funcdef_flag
= false;
5550 bool funcdef_syntax
= false;
5551 bool size_varies
= false;
5552 tree decl_attr
= declspecs
->decl_attr
;
5553 int array_ptr_quals
= TYPE_UNQUALIFIED
;
5554 tree array_ptr_attrs
= NULL_TREE
;
5555 bool array_parm_static
= false;
5556 bool array_parm_vla_unspec_p
= false;
5557 tree returned_attrs
= NULL_TREE
;
5558 bool bitfield
= width
!= NULL
;
5560 tree orig_qual_type
= NULL
;
5561 size_t orig_qual_indirect
= 0;
5562 struct c_arg_info
*arg_info
= 0;
5563 addr_space_t as1
, as2
, address_space
;
5564 location_t loc
= UNKNOWN_LOCATION
;
5566 bool expr_const_operands_dummy
;
5567 enum c_declarator_kind first_non_attr_kind
;
5568 unsigned int alignas_align
= 0;
5570 if (TREE_CODE (type
) == ERROR_MARK
)
5571 return error_mark_node
;
5575 expr_dummy
= NULL_TREE
;
5577 if (expr_const_operands
== NULL
)
5578 expr_const_operands
= &expr_const_operands_dummy
;
5580 if (declspecs
->expr
)
5583 *expr
= build2 (COMPOUND_EXPR
, TREE_TYPE (declspecs
->expr
), *expr
,
5586 *expr
= declspecs
->expr
;
5588 *expr_const_operands
= declspecs
->expr_const_operands
;
5590 if (decl_context
== FUNCDEF
)
5591 funcdef_flag
= true, decl_context
= NORMAL
;
5593 /* Look inside a declarator for the name being declared
5594 and get it as an IDENTIFIER_NODE, for an error message. */
5596 const struct c_declarator
*decl
= declarator
;
5598 first_non_attr_kind
= cdk_attrs
;
5608 funcdef_syntax
= (decl
->kind
== cdk_function
);
5609 if (first_non_attr_kind
== cdk_attrs
)
5610 first_non_attr_kind
= decl
->kind
;
5611 decl
= decl
->declarator
;
5615 decl
= decl
->declarator
;
5622 if (first_non_attr_kind
== cdk_attrs
)
5623 first_non_attr_kind
= decl
->kind
;
5630 if (name
== NULL_TREE
)
5632 gcc_assert (decl_context
== PARM
5633 || decl_context
== TYPENAME
5634 || (decl_context
== FIELD
5635 && declarator
->kind
== cdk_id
));
5636 gcc_assert (!initialized
);
5640 /* A function definition's declarator must have the form of
5641 a function declarator. */
5643 if (funcdef_flag
&& !funcdef_syntax
)
5646 /* If this looks like a function definition, make it one,
5647 even if it occurs where parms are expected.
5648 Then store_parm_decls will reject it and not use it as a parm. */
5649 if (decl_context
== NORMAL
&& !funcdef_flag
&& current_scope
->parm_flag
)
5650 decl_context
= PARM
;
5652 if (declspecs
->deprecated_p
&& deprecated_state
!= DEPRECATED_SUPPRESS
)
5653 warn_deprecated_use (declspecs
->type
, declspecs
->decl_attr
);
5655 if ((decl_context
== NORMAL
|| decl_context
== FIELD
)
5656 && current_scope
== file_scope
5657 && variably_modified_type_p (type
, NULL_TREE
))
5660 error_at (loc
, "variably modified %qE at file scope", name
);
5662 error_at (loc
, "variably modified field at file scope");
5663 type
= integer_type_node
;
5666 size_varies
= C_TYPE_VARIABLE_SIZE (type
) != 0;
5668 /* Diagnose defaulting to "int". */
5670 if (declspecs
->default_int_p
&& !in_system_header_at (input_location
))
5672 /* Issue a warning if this is an ISO C 99 program or if
5673 -Wreturn-type and this is a function, or if -Wimplicit;
5674 prefer the former warning since it is more explicit. */
5675 if ((warn_implicit_int
|| warn_return_type
|| flag_isoc99
)
5677 warn_about_return_type
= 1;
5681 warn_defaults_to (loc
, OPT_Wimplicit_int
,
5682 "type defaults to %<int%> in declaration "
5685 warn_defaults_to (loc
, OPT_Wimplicit_int
,
5686 "type defaults to %<int%> in type name");
5690 /* Adjust the type if a bit-field is being declared,
5691 -funsigned-bitfields applied and the type is not explicitly
5693 if (bitfield
&& !flag_signed_bitfields
&& !declspecs
->explicit_signed_p
5694 && TREE_CODE (type
) == INTEGER_TYPE
)
5695 type
= unsigned_type_for (type
);
5697 /* Figure out the type qualifiers for the declaration. There are
5698 two ways a declaration can become qualified. One is something
5699 like `const int i' where the `const' is explicit. Another is
5700 something like `typedef const int CI; CI i' where the type of the
5701 declaration contains the `const'. A third possibility is that
5702 there is a type qualifier on the element type of a typedefed
5703 array type, in which case we should extract that qualifier so
5704 that c_apply_type_quals_to_decl receives the full list of
5705 qualifiers to work with (C90 is not entirely clear about whether
5706 duplicate qualifiers should be diagnosed in this case, but it
5707 seems most appropriate to do so). */
5708 element_type
= strip_array_types (type
);
5709 constp
= declspecs
->const_p
+ TYPE_READONLY (element_type
);
5710 restrictp
= declspecs
->restrict_p
+ TYPE_RESTRICT (element_type
);
5711 volatilep
= declspecs
->volatile_p
+ TYPE_VOLATILE (element_type
);
5712 atomicp
= declspecs
->atomic_p
+ TYPE_ATOMIC (element_type
);
5713 as1
= declspecs
->address_space
;
5714 as2
= TYPE_ADDR_SPACE (element_type
);
5715 address_space
= ADDR_SPACE_GENERIC_P (as1
)? as2
: as1
;
5718 pedwarn_c90 (loc
, OPT_Wpedantic
, "duplicate %<const%>");
5720 pedwarn_c90 (loc
, OPT_Wpedantic
, "duplicate %<restrict%>");
5722 pedwarn_c90 (loc
, OPT_Wpedantic
, "duplicate %<volatile%>");
5724 pedwarn_c90 (loc
, OPT_Wpedantic
, "duplicate %<_Atomic%>");
5726 if (!ADDR_SPACE_GENERIC_P (as1
) && !ADDR_SPACE_GENERIC_P (as2
) && as1
!= as2
)
5727 error_at (loc
, "conflicting named address spaces (%s vs %s)",
5728 c_addr_space_name (as1
), c_addr_space_name (as2
));
5730 if ((TREE_CODE (type
) == ARRAY_TYPE
5731 || first_non_attr_kind
== cdk_array
)
5732 && TYPE_QUALS (element_type
))
5734 orig_qual_type
= type
;
5735 type
= TYPE_MAIN_VARIANT (type
);
5737 type_quals
= ((constp
? TYPE_QUAL_CONST
: 0)
5738 | (restrictp
? TYPE_QUAL_RESTRICT
: 0)
5739 | (volatilep
? TYPE_QUAL_VOLATILE
: 0)
5740 | (atomicp
? TYPE_QUAL_ATOMIC
: 0)
5741 | ENCODE_QUAL_ADDR_SPACE (address_space
));
5742 if (type_quals
!= TYPE_QUALS (element_type
))
5743 orig_qual_type
= NULL_TREE
;
5745 /* Applying the _Atomic qualifier to an array type (through the use
5746 of typedefs or typeof) must be detected here. If the qualifier
5747 is introduced later, any appearance of applying it to an array is
5748 actually applying it to an element of that array. */
5749 if (atomicp
&& TREE_CODE (type
) == ARRAY_TYPE
)
5750 error_at (loc
, "%<_Atomic%>-qualified array type");
5752 /* Warn about storage classes that are invalid for certain
5753 kinds of declarations (parameters, typenames, etc.). */
5757 || storage_class
== csc_auto
5758 || storage_class
== csc_register
5759 || storage_class
== csc_typedef
))
5761 if (storage_class
== csc_auto
)
5763 (current_scope
== file_scope
) ? 0 : OPT_Wpedantic
,
5764 "function definition declared %<auto%>");
5765 if (storage_class
== csc_register
)
5766 error_at (loc
, "function definition declared %<register%>");
5767 if (storage_class
== csc_typedef
)
5768 error_at (loc
, "function definition declared %<typedef%>");
5770 error_at (loc
, "function definition declared %qs",
5771 declspecs
->thread_gnu_p
? "__thread" : "_Thread_local");
5773 if (storage_class
== csc_auto
5774 || storage_class
== csc_register
5775 || storage_class
== csc_typedef
)
5776 storage_class
= csc_none
;
5778 else if (decl_context
!= NORMAL
&& (storage_class
!= csc_none
|| threadp
))
5780 if (decl_context
== PARM
&& storage_class
== csc_register
)
5784 switch (decl_context
)
5788 error_at (loc
, "storage class specified for structure "
5791 error_at (loc
, "storage class specified for structure field");
5795 error_at (loc
, "storage class specified for parameter %qE",
5798 error_at (loc
, "storage class specified for unnamed parameter");
5801 error_at (loc
, "storage class specified for typename");
5804 storage_class
= csc_none
;
5808 else if (storage_class
== csc_extern
5812 /* 'extern' with initialization is invalid if not at file scope. */
5813 if (current_scope
== file_scope
)
5815 /* It is fine to have 'extern const' when compiling at C
5816 and C++ intersection. */
5817 if (!(warn_cxx_compat
&& constp
))
5818 warning_at (loc
, 0, "%qE initialized and declared %<extern%>",
5822 error_at (loc
, "%qE has both %<extern%> and initializer", name
);
5824 else if (current_scope
== file_scope
)
5826 if (storage_class
== csc_auto
)
5827 error_at (loc
, "file-scope declaration of %qE specifies %<auto%>",
5829 if (pedantic
&& storage_class
== csc_register
)
5830 pedwarn (input_location
, OPT_Wpedantic
,
5831 "file-scope declaration of %qE specifies %<register%>", name
);
5835 if (storage_class
== csc_extern
&& funcdef_flag
)
5836 error_at (loc
, "nested function %qE declared %<extern%>", name
);
5837 else if (threadp
&& storage_class
== csc_none
)
5839 error_at (loc
, "function-scope %qE implicitly auto and declared "
5841 declspecs
->thread_gnu_p
? "__thread" : "_Thread_local");
5846 /* Now figure out the structure of the declarator proper.
5847 Descend through it, creating more complex types, until we reach
5848 the declared identifier (or NULL_TREE, in an absolute declarator).
5849 At each stage we maintain an unqualified version of the type
5850 together with any qualifiers that should be applied to it with
5851 c_build_qualified_type; this way, array types including
5852 multidimensional array types are first built up in unqualified
5853 form and then the qualified form is created with
5854 TYPE_MAIN_VARIANT pointing to the unqualified form. */
5856 while (declarator
&& declarator
->kind
!= cdk_id
)
5858 if (type
== error_mark_node
)
5860 declarator
= declarator
->declarator
;
5864 /* Each level of DECLARATOR is either a cdk_array (for ...[..]),
5865 a cdk_pointer (for *...),
5866 a cdk_function (for ...(...)),
5867 a cdk_attrs (for nested attributes),
5868 or a cdk_id (for the name being declared
5869 or the place in an absolute declarator
5870 where the name was omitted).
5871 For the last case, we have just exited the loop.
5873 At this point, TYPE is the type of elements of an array,
5874 or for a function to return, or for a pointer to point to.
5875 After this sequence of ifs, TYPE is the type of the
5876 array or function or pointer, and DECLARATOR has had its
5877 outermost layer removed. */
5879 if (array_ptr_quals
!= TYPE_UNQUALIFIED
5880 || array_ptr_attrs
!= NULL_TREE
5881 || array_parm_static
)
5883 /* Only the innermost declarator (making a parameter be of
5884 array type which is converted to pointer type)
5885 may have static or type qualifiers. */
5886 error_at (loc
, "static or type qualifiers in non-parameter array declarator");
5887 array_ptr_quals
= TYPE_UNQUALIFIED
;
5888 array_ptr_attrs
= NULL_TREE
;
5889 array_parm_static
= false;
5892 switch (declarator
->kind
)
5896 /* A declarator with embedded attributes. */
5897 tree attrs
= declarator
->u
.attrs
;
5898 const struct c_declarator
*inner_decl
;
5900 declarator
= declarator
->declarator
;
5901 inner_decl
= declarator
;
5902 while (inner_decl
->kind
== cdk_attrs
)
5903 inner_decl
= inner_decl
->declarator
;
5904 if (inner_decl
->kind
== cdk_id
)
5905 attr_flags
|= (int) ATTR_FLAG_DECL_NEXT
;
5906 else if (inner_decl
->kind
== cdk_function
)
5907 attr_flags
|= (int) ATTR_FLAG_FUNCTION_NEXT
;
5908 else if (inner_decl
->kind
== cdk_array
)
5909 attr_flags
|= (int) ATTR_FLAG_ARRAY_NEXT
;
5910 returned_attrs
= decl_attributes (&type
,
5911 chainon (returned_attrs
, attrs
),
5917 tree itype
= NULL_TREE
;
5918 tree size
= declarator
->u
.array
.dimen
;
5919 /* The index is a signed object `sizetype' bits wide. */
5920 tree index_type
= c_common_signed_type (sizetype
);
5922 array_ptr_quals
= declarator
->u
.array
.quals
;
5923 array_ptr_attrs
= declarator
->u
.array
.attrs
;
5924 array_parm_static
= declarator
->u
.array
.static_p
;
5925 array_parm_vla_unspec_p
= declarator
->u
.array
.vla_unspec_p
;
5927 declarator
= declarator
->declarator
;
5929 /* Check for some types that there cannot be arrays of. */
5931 if (VOID_TYPE_P (type
))
5934 error_at (loc
, "declaration of %qE as array of voids", name
);
5936 error_at (loc
, "declaration of type name as array of voids");
5937 type
= error_mark_node
;
5940 if (TREE_CODE (type
) == FUNCTION_TYPE
)
5943 error_at (loc
, "declaration of %qE as array of functions",
5946 error_at (loc
, "declaration of type name as array of "
5948 type
= error_mark_node
;
5951 if (pedantic
&& !in_system_header_at (input_location
)
5952 && flexible_array_type_p (type
))
5953 pedwarn (loc
, OPT_Wpedantic
,
5954 "invalid use of structure with flexible array member");
5956 if (size
== error_mark_node
)
5957 type
= error_mark_node
;
5959 if (type
== error_mark_node
)
5962 /* If size was specified, set ITYPE to a range-type for
5963 that size. Otherwise, ITYPE remains null. finish_decl
5964 may figure it out from an initial value. */
5968 bool size_maybe_const
= true;
5969 bool size_int_const
= (TREE_CODE (size
) == INTEGER_CST
5970 && !TREE_OVERFLOW (size
));
5971 bool this_size_varies
= false;
5973 /* Strip NON_LVALUE_EXPRs since we aren't using as an
5975 STRIP_TYPE_NOPS (size
);
5977 if (!INTEGRAL_TYPE_P (TREE_TYPE (size
)))
5980 error_at (loc
, "size of array %qE has non-integer type",
5984 "size of unnamed array has non-integer type");
5985 size
= integer_one_node
;
5987 /* This can happen with enum forward declaration. */
5988 else if (!COMPLETE_TYPE_P (TREE_TYPE (size
)))
5991 error_at (loc
, "size of array %qE has incomplete type",
5994 error_at (loc
, "size of unnamed array has incomplete "
5996 size
= integer_one_node
;
5999 size
= c_fully_fold (size
, false, &size_maybe_const
);
6001 if (pedantic
&& size_maybe_const
&& integer_zerop (size
))
6004 pedwarn (loc
, OPT_Wpedantic
,
6005 "ISO C forbids zero-size array %qE", name
);
6007 pedwarn (loc
, OPT_Wpedantic
,
6008 "ISO C forbids zero-size array");
6011 if (TREE_CODE (size
) == INTEGER_CST
&& size_maybe_const
)
6013 constant_expression_warning (size
);
6014 if (tree_int_cst_sgn (size
) < 0)
6017 error_at (loc
, "size of array %qE is negative", name
);
6019 error_at (loc
, "size of unnamed array is negative");
6020 size
= integer_one_node
;
6022 /* Handle a size folded to an integer constant but
6023 not an integer constant expression. */
6024 if (!size_int_const
)
6026 /* If this is a file scope declaration of an
6027 ordinary identifier, this is invalid code;
6028 diagnosing it here and not subsequently
6029 treating the type as variable-length avoids
6030 more confusing diagnostics later. */
6031 if ((decl_context
== NORMAL
|| decl_context
== FIELD
)
6032 && current_scope
== file_scope
)
6033 pedwarn (input_location
, 0,
6034 "variably modified %qE at file scope",
6037 this_size_varies
= size_varies
= true;
6038 warn_variable_length_array (name
, size
);
6041 else if ((decl_context
== NORMAL
|| decl_context
== FIELD
)
6042 && current_scope
== file_scope
)
6044 error_at (loc
, "variably modified %qE at file scope", name
);
6045 size
= integer_one_node
;
6049 /* Make sure the array size remains visibly
6050 nonconstant even if it is (eg) a const variable
6051 with known value. */
6052 this_size_varies
= size_varies
= true;
6053 warn_variable_length_array (name
, size
);
6054 if (sanitize_flags_p (SANITIZE_VLA
)
6055 && decl_context
== NORMAL
)
6057 /* Evaluate the array size only once. */
6058 size
= save_expr (size
);
6059 size
= c_fully_fold (size
, false, NULL
);
6060 size
= fold_build2 (COMPOUND_EXPR
, TREE_TYPE (size
),
6061 ubsan_instrument_vla (loc
, size
),
6066 if (integer_zerop (size
) && !this_size_varies
)
6068 /* A zero-length array cannot be represented with
6069 an unsigned index type, which is what we'll
6070 get with build_index_type. Create an
6071 open-ended range instead. */
6072 itype
= build_range_type (sizetype
, size
, NULL_TREE
);
6076 /* Arrange for the SAVE_EXPR on the inside of the
6077 MINUS_EXPR, which allows the -1 to get folded
6078 with the +1 that happens when building TYPE_SIZE. */
6080 size
= save_expr (size
);
6081 if (this_size_varies
&& TREE_CODE (size
) == INTEGER_CST
)
6082 size
= build2 (COMPOUND_EXPR
, TREE_TYPE (size
),
6083 integer_zero_node
, size
);
6085 /* Compute the maximum valid index, that is, size
6086 - 1. Do the calculation in index_type, so that
6087 if it is a variable the computations will be
6088 done in the proper mode. */
6089 itype
= fold_build2_loc (loc
, MINUS_EXPR
, index_type
,
6090 convert (index_type
, size
),
6091 convert (index_type
,
6094 /* The above overflows when size does not fit
6096 ??? While a size of INT_MAX+1 technically shouldn't
6097 cause an overflow (because we subtract 1), handling
6098 this case seems like an unnecessary complication. */
6099 if (TREE_CODE (size
) == INTEGER_CST
6100 && !int_fits_type_p (size
, index_type
))
6103 error_at (loc
, "size of array %qE is too large",
6106 error_at (loc
, "size of unnamed array is too large");
6107 type
= error_mark_node
;
6111 itype
= build_index_type (itype
);
6113 if (this_size_varies
)
6116 *expr
= build2 (COMPOUND_EXPR
, TREE_TYPE (size
),
6120 *expr_const_operands
&= size_maybe_const
;
6123 else if (decl_context
== FIELD
)
6125 bool flexible_array_member
= false;
6126 if (array_parm_vla_unspec_p
)
6127 /* Field names can in fact have function prototype
6128 scope so [*] is disallowed here through making
6129 the field variably modified, not through being
6130 something other than a declaration with function
6135 const struct c_declarator
*t
= declarator
;
6136 while (t
->kind
== cdk_attrs
)
6138 flexible_array_member
= (t
->kind
== cdk_id
);
6140 if (flexible_array_member
6141 && !in_system_header_at (input_location
))
6142 pedwarn_c90 (loc
, OPT_Wpedantic
, "ISO C90 does not "
6143 "support flexible array members");
6145 /* ISO C99 Flexible array members are effectively
6146 identical to GCC's zero-length array extension. */
6147 if (flexible_array_member
|| array_parm_vla_unspec_p
)
6148 itype
= build_range_type (sizetype
, size_zero_node
,
6151 else if (decl_context
== PARM
)
6153 if (array_parm_vla_unspec_p
)
6155 itype
= build_range_type (sizetype
, size_zero_node
, NULL_TREE
);
6159 else if (decl_context
== TYPENAME
)
6161 if (array_parm_vla_unspec_p
)
6164 warning (0, "%<[*]%> not in a declaration");
6165 /* We use this to avoid messing up with incomplete
6166 array types of the same type, that would
6167 otherwise be modified below. */
6168 itype
= build_range_type (sizetype
, size_zero_node
,
6174 /* Complain about arrays of incomplete types. */
6175 if (!COMPLETE_TYPE_P (type
))
6177 error_at (loc
, "array type has incomplete element type %qT",
6179 /* See if we can be more helpful. */
6180 if (TREE_CODE (type
) == ARRAY_TYPE
)
6183 inform (loc
, "declaration of %qE as multidimensional "
6184 "array must have bounds for all dimensions "
6185 "except the first", name
);
6187 inform (loc
, "declaration of multidimensional array "
6188 "must have bounds for all dimensions except "
6191 type
= error_mark_node
;
6194 /* When itype is NULL, a shared incomplete array type is
6195 returned for all array of a given type. Elsewhere we
6196 make sure we don't complete that type before copying
6197 it, but here we want to make sure we don't ever
6198 modify the shared type, so we gcc_assert (itype)
6201 addr_space_t as
= DECODE_QUAL_ADDR_SPACE (type_quals
);
6202 if (!ADDR_SPACE_GENERIC_P (as
) && as
!= TYPE_ADDR_SPACE (type
))
6203 type
= build_qualified_type (type
,
6204 ENCODE_QUAL_ADDR_SPACE (as
));
6206 type
= build_array_type (type
, itype
);
6209 if (type
!= error_mark_node
)
6213 /* It is ok to modify type here even if itype is
6214 NULL: if size_varies, we're in a
6215 multi-dimensional array and the inner type has
6216 variable size, so the enclosing shared array type
6218 if (size
&& TREE_CODE (size
) == INTEGER_CST
)
6220 = build_distinct_type_copy (TYPE_MAIN_VARIANT (type
));
6221 C_TYPE_VARIABLE_SIZE (type
) = 1;
6224 /* The GCC extension for zero-length arrays differs from
6225 ISO flexible array members in that sizeof yields
6227 if (size
&& integer_zerop (size
))
6230 type
= build_distinct_type_copy (TYPE_MAIN_VARIANT (type
));
6231 TYPE_SIZE (type
) = bitsize_zero_node
;
6232 TYPE_SIZE_UNIT (type
) = size_zero_node
;
6233 SET_TYPE_STRUCTURAL_EQUALITY (type
);
6235 if (array_parm_vla_unspec_p
)
6238 /* The type is complete. C99 6.7.5.2p4 */
6239 type
= build_distinct_type_copy (TYPE_MAIN_VARIANT (type
));
6240 TYPE_SIZE (type
) = bitsize_zero_node
;
6241 TYPE_SIZE_UNIT (type
) = size_zero_node
;
6242 SET_TYPE_STRUCTURAL_EQUALITY (type
);
6245 if (!valid_array_size_p (loc
, type
, name
))
6246 type
= error_mark_node
;
6249 if (decl_context
!= PARM
6250 && (array_ptr_quals
!= TYPE_UNQUALIFIED
6251 || array_ptr_attrs
!= NULL_TREE
6252 || array_parm_static
))
6254 error_at (loc
, "static or type qualifiers in non-parameter "
6255 "array declarator");
6256 array_ptr_quals
= TYPE_UNQUALIFIED
;
6257 array_ptr_attrs
= NULL_TREE
;
6258 array_parm_static
= false;
6260 orig_qual_indirect
++;
6265 /* Say it's a definition only for the declarator closest
6266 to the identifier, apart possibly from some
6268 bool really_funcdef
= false;
6270 orig_qual_type
= NULL_TREE
;
6273 const struct c_declarator
*t
= declarator
->declarator
;
6274 while (t
->kind
== cdk_attrs
)
6276 really_funcdef
= (t
->kind
== cdk_id
);
6279 /* Declaring a function type. Make sure we have a valid
6280 type for the function to return. */
6281 if (type
== error_mark_node
)
6284 size_varies
= false;
6286 /* Warn about some types functions can't return. */
6287 if (TREE_CODE (type
) == FUNCTION_TYPE
)
6290 error_at (loc
, "%qE declared as function returning a "
6293 error_at (loc
, "type name declared as function "
6294 "returning a function");
6295 type
= integer_type_node
;
6297 if (TREE_CODE (type
) == ARRAY_TYPE
)
6300 error_at (loc
, "%qE declared as function returning an array",
6303 error_at (loc
, "type name declared as function returning "
6305 type
= integer_type_node
;
6308 /* Construct the function type and go to the next
6309 inner layer of declarator. */
6310 arg_info
= declarator
->u
.arg_info
;
6311 arg_types
= grokparms (arg_info
, really_funcdef
);
6313 /* Type qualifiers before the return type of the function
6314 qualify the return type, not the function type. */
6317 const enum c_declspec_word ignored_quals_list
[] =
6319 cdw_const
, cdw_volatile
, cdw_restrict
, cdw_address_space
,
6320 cdw_atomic
, cdw_number_of_elements
6322 location_t specs_loc
6323 = smallest_type_quals_location (declspecs
->locations
,
6324 ignored_quals_list
);
6325 if (specs_loc
== UNKNOWN_LOCATION
)
6326 specs_loc
= declspecs
->locations
[cdw_typedef
];
6327 if (specs_loc
== UNKNOWN_LOCATION
)
6330 /* Type qualifiers on a function return type are
6331 normally permitted by the standard but have no
6332 effect, so give a warning at -Wreturn-type.
6333 Qualifiers on a void return type are banned on
6334 function definitions in ISO C; GCC used to used
6335 them for noreturn functions. The resolution of C11
6336 DR#423 means qualifiers (other than _Atomic) are
6337 actually removed from the return type when
6338 determining the function type. */
6339 int quals_used
= type_quals
;
6341 quals_used
&= TYPE_QUAL_ATOMIC
;
6342 if (quals_used
&& VOID_TYPE_P (type
) && really_funcdef
)
6343 pedwarn (specs_loc
, 0,
6344 "function definition has qualified void return type");
6346 warning_at (specs_loc
, OPT_Wignored_qualifiers
,
6347 "type qualifiers ignored on function return type");
6349 /* Ensure an error for restrict on invalid types; the
6350 DR#423 resolution is not entirely clear about
6353 && (type_quals
& TYPE_QUAL_RESTRICT
)
6354 && (!POINTER_TYPE_P (type
)
6355 || !C_TYPE_OBJECT_OR_INCOMPLETE_P (TREE_TYPE (type
))))
6356 error_at (loc
, "invalid use of %<restrict%>");
6358 type
= c_build_qualified_type (type
, quals_used
);
6360 type_quals
= TYPE_UNQUALIFIED
;
6362 type
= build_function_type (type
, arg_types
);
6363 declarator
= declarator
->declarator
;
6365 /* Set the TYPE_CONTEXTs for each tagged type which is local to
6366 the formal parameter list of this FUNCTION_TYPE to point to
6367 the FUNCTION_TYPE node itself. */
6372 FOR_EACH_VEC_SAFE_ELT_REVERSE (arg_info
->tags
, ix
, tag
)
6373 TYPE_CONTEXT (tag
->type
) = type
;
6379 /* Merge any constancy or volatility into the target type
6381 if ((type_quals
& TYPE_QUAL_ATOMIC
)
6382 && TREE_CODE (type
) == FUNCTION_TYPE
)
6385 "%<_Atomic%>-qualified function type");
6386 type_quals
&= ~TYPE_QUAL_ATOMIC
;
6388 else if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
6390 pedwarn (loc
, OPT_Wpedantic
,
6391 "ISO C forbids qualified function types");
6393 type
= c_build_qualified_type (type
, type_quals
, orig_qual_type
,
6394 orig_qual_indirect
);
6395 orig_qual_type
= NULL_TREE
;
6396 size_varies
= false;
6398 /* When the pointed-to type involves components of variable size,
6399 care must be taken to ensure that the size evaluation code is
6400 emitted early enough to dominate all the possible later uses
6401 and late enough for the variables on which it depends to have
6404 This is expected to happen automatically when the pointed-to
6405 type has a name/declaration of it's own, but special attention
6406 is required if the type is anonymous.
6408 We handle the NORMAL and FIELD contexts here by attaching an
6409 artificial TYPE_DECL to such pointed-to type. This forces the
6410 sizes evaluation at a safe point and ensures it is not deferred
6411 until e.g. within a deeper conditional context.
6413 We expect nothing to be needed here for PARM or TYPENAME.
6414 Pushing a TYPE_DECL at this point for TYPENAME would actually
6415 be incorrect, as we might be in the middle of an expression
6416 with side effects on the pointed-to type size "arguments" prior
6417 to the pointer declaration point and the fake TYPE_DECL in the
6418 enclosing context would force the size evaluation prior to the
6421 if (!TYPE_NAME (type
)
6422 && (decl_context
== NORMAL
|| decl_context
== FIELD
)
6423 && variably_modified_type_p (type
, NULL_TREE
))
6425 tree decl
= build_decl (loc
, TYPE_DECL
, NULL_TREE
, type
);
6426 DECL_ARTIFICIAL (decl
) = 1;
6428 finish_decl (decl
, loc
, NULL_TREE
, NULL_TREE
, NULL_TREE
);
6429 TYPE_NAME (type
) = decl
;
6432 type
= c_build_pointer_type (type
);
6434 /* Process type qualifiers (such as const or volatile)
6435 that were given inside the `*'. */
6436 type_quals
= declarator
->u
.pointer_quals
;
6438 declarator
= declarator
->declarator
;
6445 *decl_attrs
= chainon (returned_attrs
, *decl_attrs
);
6447 /* Now TYPE has the actual type, apart from any qualifiers in
6450 /* Warn about address space used for things other than static memory or
6452 address_space
= DECODE_QUAL_ADDR_SPACE (type_quals
);
6453 if (!ADDR_SPACE_GENERIC_P (address_space
))
6455 if (decl_context
== NORMAL
)
6457 switch (storage_class
)
6460 error ("%qs combined with %<auto%> qualifier for %qE",
6461 c_addr_space_name (address_space
), name
);
6464 error ("%qs combined with %<register%> qualifier for %qE",
6465 c_addr_space_name (address_space
), name
);
6468 if (current_function_scope
)
6470 error ("%qs specified for auto variable %qE",
6471 c_addr_space_name (address_space
), name
);
6483 else if (decl_context
== PARM
&& TREE_CODE (type
) != ARRAY_TYPE
)
6486 error ("%qs specified for parameter %qE",
6487 c_addr_space_name (address_space
), name
);
6489 error ("%qs specified for unnamed parameter",
6490 c_addr_space_name (address_space
));
6492 else if (decl_context
== FIELD
)
6495 error ("%qs specified for structure field %qE",
6496 c_addr_space_name (address_space
), name
);
6498 error ("%qs specified for structure field",
6499 c_addr_space_name (address_space
));
6503 /* Check the type and width of a bit-field. */
6506 check_bitfield_type_and_width (loc
, &type
, width
, name
);
6507 /* C11 makes it implementation-defined (6.7.2.1#5) whether
6508 atomic types are permitted for bit-fields; we have no code to
6509 make bit-field accesses atomic, so disallow them. */
6510 if (type_quals
& TYPE_QUAL_ATOMIC
)
6513 error_at (loc
, "bit-field %qE has atomic type", name
);
6515 error_at (loc
, "bit-field has atomic type");
6516 type_quals
&= ~TYPE_QUAL_ATOMIC
;
6520 /* Reject invalid uses of _Alignas. */
6521 if (declspecs
->alignas_p
)
6523 if (storage_class
== csc_typedef
)
6524 error_at (loc
, "alignment specified for typedef %qE", name
);
6525 else if (storage_class
== csc_register
)
6526 error_at (loc
, "alignment specified for %<register%> object %qE",
6528 else if (decl_context
== PARM
)
6531 error_at (loc
, "alignment specified for parameter %qE", name
);
6533 error_at (loc
, "alignment specified for unnamed parameter");
6538 error_at (loc
, "alignment specified for bit-field %qE", name
);
6540 error_at (loc
, "alignment specified for unnamed bit-field");
6542 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
6543 error_at (loc
, "alignment specified for function %qE", name
);
6544 else if (declspecs
->align_log
!= -1 && TYPE_P (type
))
6546 alignas_align
= 1U << declspecs
->align_log
;
6547 if (alignas_align
< min_align_of_type (type
))
6550 error_at (loc
, "%<_Alignas%> specifiers cannot reduce "
6551 "alignment of %qE", name
);
6553 error_at (loc
, "%<_Alignas%> specifiers cannot reduce "
6554 "alignment of unnamed field");
6560 /* If this is declaring a typedef name, return a TYPE_DECL. */
6562 if (storage_class
== csc_typedef
)
6565 if ((type_quals
& TYPE_QUAL_ATOMIC
)
6566 && TREE_CODE (type
) == FUNCTION_TYPE
)
6569 "%<_Atomic%>-qualified function type");
6570 type_quals
&= ~TYPE_QUAL_ATOMIC
;
6572 else if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
6574 pedwarn (loc
, OPT_Wpedantic
,
6575 "ISO C forbids qualified function types");
6577 type
= c_build_qualified_type (type
, type_quals
, orig_qual_type
,
6578 orig_qual_indirect
);
6579 decl
= build_decl (declarator
->id_loc
,
6580 TYPE_DECL
, declarator
->u
.id
, type
);
6581 if (declspecs
->explicit_signed_p
)
6582 C_TYPEDEF_EXPLICITLY_SIGNED (decl
) = 1;
6583 if (declspecs
->inline_p
)
6584 pedwarn (loc
, 0,"typedef %q+D declared %<inline%>", decl
);
6585 if (declspecs
->noreturn_p
)
6586 pedwarn (loc
, 0,"typedef %q+D declared %<_Noreturn%>", decl
);
6588 if (warn_cxx_compat
&& declarator
->u
.id
!= NULL_TREE
)
6590 struct c_binding
*b
= I_TAG_BINDING (declarator
->u
.id
);
6593 && b
->decl
!= NULL_TREE
6594 && (B_IN_CURRENT_SCOPE (b
)
6595 || (current_scope
== file_scope
&& B_IN_EXTERNAL_SCOPE (b
)))
6596 && TYPE_MAIN_VARIANT (b
->decl
) != TYPE_MAIN_VARIANT (type
))
6598 warning_at (declarator
->id_loc
, OPT_Wc___compat
,
6599 ("using %qD as both a typedef and a tag is "
6602 if (b
->locus
!= UNKNOWN_LOCATION
)
6603 inform (b
->locus
, "originally defined here");
6610 /* If this is a type name (such as, in a cast or sizeof),
6611 compute the type and return it now. */
6613 if (decl_context
== TYPENAME
)
6615 /* Note that the grammar rejects storage classes in typenames
6617 gcc_assert (storage_class
== csc_none
&& !threadp
6618 && !declspecs
->inline_p
&& !declspecs
->noreturn_p
);
6619 if ((type_quals
& TYPE_QUAL_ATOMIC
)
6620 && TREE_CODE (type
) == FUNCTION_TYPE
)
6623 "%<_Atomic%>-qualified function type");
6624 type_quals
&= ~TYPE_QUAL_ATOMIC
;
6626 else if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
6628 pedwarn (loc
, OPT_Wpedantic
,
6629 "ISO C forbids const or volatile function types");
6631 type
= c_build_qualified_type (type
, type_quals
, orig_qual_type
,
6632 orig_qual_indirect
);
6636 if (pedantic
&& decl_context
== FIELD
6637 && variably_modified_type_p (type
, NULL_TREE
))
6640 pedwarn (loc
, OPT_Wpedantic
, "a member of a structure or union cannot "
6641 "have a variably modified type");
6644 /* Aside from typedefs and type names (handle above),
6645 `void' at top level (not within pointer)
6646 is allowed only in public variables.
6647 We don't complain about parms either, but that is because
6648 a better error message can be made later. */
6650 if (VOID_TYPE_P (type
) && decl_context
!= PARM
6651 && !((decl_context
!= FIELD
&& TREE_CODE (type
) != FUNCTION_TYPE
)
6652 && (storage_class
== csc_extern
6653 || (current_scope
== file_scope
6654 && !(storage_class
== csc_static
6655 || storage_class
== csc_register
)))))
6657 error_at (loc
, "variable or field %qE declared void", name
);
6658 type
= integer_type_node
;
6661 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
6662 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
6667 if (decl_context
== PARM
)
6670 bool array_parameter_p
= false;
6672 /* A parameter declared as an array of T is really a pointer to T.
6673 One declared as a function is really a pointer to a function. */
6675 if (TREE_CODE (type
) == ARRAY_TYPE
)
6677 /* Transfer const-ness of array into that of type pointed to. */
6678 type
= TREE_TYPE (type
);
6679 if (orig_qual_type
!= NULL_TREE
)
6681 if (orig_qual_indirect
== 0)
6682 orig_qual_type
= TREE_TYPE (orig_qual_type
);
6684 orig_qual_indirect
--;
6687 type
= c_build_qualified_type (type
, type_quals
, orig_qual_type
,
6688 orig_qual_indirect
);
6689 type
= c_build_pointer_type (type
);
6690 type_quals
= array_ptr_quals
;
6692 type
= c_build_qualified_type (type
, type_quals
);
6694 /* We don't yet implement attributes in this context. */
6695 if (array_ptr_attrs
!= NULL_TREE
)
6696 warning_at (loc
, OPT_Wattributes
,
6697 "attributes in parameter array declarator ignored");
6699 size_varies
= false;
6700 array_parameter_p
= true;
6702 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
6704 if (type_quals
& TYPE_QUAL_ATOMIC
)
6707 "%<_Atomic%>-qualified function type");
6708 type_quals
&= ~TYPE_QUAL_ATOMIC
;
6710 else if (type_quals
)
6711 pedwarn (loc
, OPT_Wpedantic
,
6712 "ISO C forbids qualified function types");
6714 type
= c_build_qualified_type (type
, type_quals
);
6715 type
= c_build_pointer_type (type
);
6716 type_quals
= TYPE_UNQUALIFIED
;
6718 else if (type_quals
)
6719 type
= c_build_qualified_type (type
, type_quals
);
6721 decl
= build_decl (declarator
->id_loc
,
6722 PARM_DECL
, declarator
->u
.id
, type
);
6724 C_DECL_VARIABLE_SIZE (decl
) = 1;
6725 C_ARRAY_PARAMETER (decl
) = array_parameter_p
;
6727 /* Compute the type actually passed in the parmlist,
6728 for the case where there is no prototype.
6729 (For example, shorts and chars are passed as ints.)
6730 When there is a prototype, this is overridden later. */
6732 if (type
== error_mark_node
)
6733 promoted_type
= type
;
6735 promoted_type
= c_type_promotes_to (type
);
6737 DECL_ARG_TYPE (decl
) = promoted_type
;
6738 if (declspecs
->inline_p
)
6739 pedwarn (loc
, 0, "parameter %q+D declared %<inline%>", decl
);
6740 if (declspecs
->noreturn_p
)
6741 pedwarn (loc
, 0, "parameter %q+D declared %<_Noreturn%>", decl
);
6743 else if (decl_context
== FIELD
)
6745 /* Note that the grammar rejects storage classes in typenames
6747 gcc_assert (storage_class
== csc_none
&& !threadp
6748 && !declspecs
->inline_p
&& !declspecs
->noreturn_p
);
6750 /* Structure field. It may not be a function. */
6752 if (TREE_CODE (type
) == FUNCTION_TYPE
)
6754 error_at (loc
, "field %qE declared as a function", name
);
6755 type
= build_pointer_type (type
);
6757 else if (TREE_CODE (type
) != ERROR_MARK
6758 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type
))
6761 error_at (loc
, "field %qE has incomplete type", name
);
6763 error_at (loc
, "unnamed field has incomplete type");
6764 type
= error_mark_node
;
6766 else if (TREE_CODE (type
) == ARRAY_TYPE
6767 && TYPE_DOMAIN (type
) == NULL_TREE
)
6769 /* We have a flexible array member through a typedef.
6770 Set suitable range. Whether this is a correct position
6771 for a flexible array member will be determined elsewhere. */
6772 if (!in_system_header_at (input_location
))
6773 pedwarn_c90 (loc
, OPT_Wpedantic
, "ISO C90 does not "
6774 "support flexible array members");
6775 type
= build_distinct_type_copy (TYPE_MAIN_VARIANT (type
));
6776 TYPE_DOMAIN (type
) = build_range_type (sizetype
, size_zero_node
,
6778 if (orig_qual_indirect
== 0)
6779 orig_qual_type
= NULL_TREE
;
6781 type
= c_build_qualified_type (type
, type_quals
, orig_qual_type
,
6782 orig_qual_indirect
);
6783 decl
= build_decl (declarator
->id_loc
,
6784 FIELD_DECL
, declarator
->u
.id
, type
);
6785 DECL_NONADDRESSABLE_P (decl
) = bitfield
;
6786 if (bitfield
&& !declarator
->u
.id
)
6787 TREE_NO_WARNING (decl
) = 1;
6790 C_DECL_VARIABLE_SIZE (decl
) = 1;
6792 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
6794 if (storage_class
== csc_register
|| threadp
)
6796 error_at (loc
, "invalid storage class for function %qE", name
);
6798 else if (current_scope
!= file_scope
)
6800 /* Function declaration not at file scope. Storage
6801 classes other than `extern' are not allowed, C99
6802 6.7.1p5, and `extern' makes no difference. However,
6803 GCC allows 'auto', perhaps with 'inline', to support
6804 nested functions. */
6805 if (storage_class
== csc_auto
)
6806 pedwarn (loc
, OPT_Wpedantic
,
6807 "invalid storage class for function %qE", name
);
6808 else if (storage_class
== csc_static
)
6810 error_at (loc
, "invalid storage class for function %qE", name
);
6812 storage_class
= declspecs
->storage_class
= csc_none
;
6818 decl
= build_decl (declarator
->id_loc
,
6819 FUNCTION_DECL
, declarator
->u
.id
, type
);
6820 decl
= build_decl_attribute_variant (decl
, decl_attr
);
6822 if (type_quals
& TYPE_QUAL_ATOMIC
)
6825 "%<_Atomic%>-qualified function type");
6826 type_quals
&= ~TYPE_QUAL_ATOMIC
;
6828 else if (pedantic
&& type_quals
&& !DECL_IN_SYSTEM_HEADER (decl
))
6829 pedwarn (loc
, OPT_Wpedantic
,
6830 "ISO C forbids qualified function types");
6832 /* Every function declaration is an external reference
6833 (DECL_EXTERNAL) except for those which are not at file
6834 scope and are explicitly declared "auto". This is
6835 forbidden by standard C (C99 6.7.1p5) and is interpreted by
6836 GCC to signify a forward declaration of a nested function. */
6837 if (storage_class
== csc_auto
&& current_scope
!= file_scope
)
6838 DECL_EXTERNAL (decl
) = 0;
6839 /* In C99, a function which is declared 'inline' with 'extern'
6840 is not an external reference (which is confusing). It
6841 means that the later definition of the function must be output
6842 in this file, C99 6.7.4p6. In GNU C89, a function declared
6843 'extern inline' is an external reference. */
6844 else if (declspecs
->inline_p
&& storage_class
!= csc_static
)
6845 DECL_EXTERNAL (decl
) = ((storage_class
== csc_extern
)
6846 == flag_gnu89_inline
);
6848 DECL_EXTERNAL (decl
) = !initialized
;
6850 /* Record absence of global scope for `static' or `auto'. */
6852 = !(storage_class
== csc_static
|| storage_class
== csc_auto
);
6854 /* For a function definition, record the argument information
6855 block where store_parm_decls will look for it. */
6857 current_function_arg_info
= arg_info
;
6859 if (declspecs
->default_int_p
)
6860 C_FUNCTION_IMPLICIT_INT (decl
) = 1;
6862 /* Record presence of `inline' and `_Noreturn', if it is
6864 if (flag_hosted
&& MAIN_NAME_P (declarator
->u
.id
))
6866 if (declspecs
->inline_p
)
6867 pedwarn (loc
, 0, "cannot inline function %<main%>");
6868 if (declspecs
->noreturn_p
)
6869 pedwarn (loc
, 0, "%<main%> declared %<_Noreturn%>");
6873 if (declspecs
->inline_p
)
6874 /* Record that the function is declared `inline'. */
6875 DECL_DECLARED_INLINE_P (decl
) = 1;
6876 if (declspecs
->noreturn_p
)
6879 pedwarn_c99 (loc
, OPT_Wpedantic
,
6880 "ISO C99 does not support %<_Noreturn%>");
6882 pedwarn_c99 (loc
, OPT_Wpedantic
,
6883 "ISO C90 does not support %<_Noreturn%>");
6884 TREE_THIS_VOLATILE (decl
) = 1;
6890 /* It's a variable. */
6891 /* An uninitialized decl with `extern' is a reference. */
6892 int extern_ref
= !initialized
&& storage_class
== csc_extern
;
6894 type
= c_build_qualified_type (type
, type_quals
, orig_qual_type
,
6895 orig_qual_indirect
);
6897 /* C99 6.2.2p7: It is invalid (compile-time undefined
6898 behavior) to create an 'extern' declaration for a
6899 variable if there is a global declaration that is
6900 'static' and the global declaration is not visible.
6901 (If the static declaration _is_ currently visible,
6902 the 'extern' declaration is taken to refer to that decl.) */
6903 if (extern_ref
&& current_scope
!= file_scope
)
6905 tree global_decl
= identifier_global_value (declarator
->u
.id
);
6906 tree visible_decl
= lookup_name (declarator
->u
.id
);
6909 && global_decl
!= visible_decl
6910 && VAR_P (global_decl
)
6911 && !TREE_PUBLIC (global_decl
))
6912 error_at (loc
, "variable previously declared %<static%> "
6913 "redeclared %<extern%>");
6916 decl
= build_decl (declarator
->id_loc
,
6917 VAR_DECL
, declarator
->u
.id
, type
);
6919 C_DECL_VARIABLE_SIZE (decl
) = 1;
6921 if (declspecs
->inline_p
)
6922 pedwarn (loc
, 0, "variable %q+D declared %<inline%>", decl
);
6923 if (declspecs
->noreturn_p
)
6924 pedwarn (loc
, 0, "variable %q+D declared %<_Noreturn%>", decl
);
6926 /* At file scope, an initialized extern declaration may follow
6927 a static declaration. In that case, DECL_EXTERNAL will be
6928 reset later in start_decl. */
6929 DECL_EXTERNAL (decl
) = (storage_class
== csc_extern
);
6931 /* At file scope, the presence of a `static' or `register' storage
6932 class specifier, or the absence of all storage class specifiers
6933 makes this declaration a definition (perhaps tentative). Also,
6934 the absence of `static' makes it public. */
6935 if (current_scope
== file_scope
)
6937 TREE_PUBLIC (decl
) = storage_class
!= csc_static
;
6938 TREE_STATIC (decl
) = !extern_ref
;
6940 /* Not at file scope, only `static' makes a static definition. */
6943 TREE_STATIC (decl
) = (storage_class
== csc_static
);
6944 TREE_PUBLIC (decl
) = extern_ref
;
6948 set_decl_tls_model (decl
, decl_default_tls_model (decl
));
6951 if ((storage_class
== csc_extern
6952 || (storage_class
== csc_none
6953 && TREE_CODE (type
) == FUNCTION_TYPE
6955 && variably_modified_type_p (type
, NULL_TREE
))
6958 if (TREE_CODE (type
) == FUNCTION_TYPE
)
6959 error_at (loc
, "non-nested function with variably modified type");
6961 error_at (loc
, "object with variably modified type must have "
6965 /* Record `register' declaration for warnings on &
6966 and in case doing stupid register allocation. */
6968 if (storage_class
== csc_register
)
6970 C_DECL_REGISTER (decl
) = 1;
6971 DECL_REGISTER (decl
) = 1;
6974 /* Record constancy and volatility. */
6975 c_apply_type_quals_to_decl (type_quals
, decl
);
6977 /* Apply _Alignas specifiers. */
6980 SET_DECL_ALIGN (decl
, alignas_align
* BITS_PER_UNIT
);
6981 DECL_USER_ALIGN (decl
) = 1;
6984 /* If a type has volatile components, it should be stored in memory.
6985 Otherwise, the fact that those components are volatile
6986 will be ignored, and would even crash the compiler.
6987 Of course, this only makes sense on VAR,PARM, and RESULT decl's. */
6988 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl
))
6989 && (VAR_P (decl
) || TREE_CODE (decl
) == PARM_DECL
6990 || TREE_CODE (decl
) == RESULT_DECL
))
6992 /* It is not an error for a structure with volatile fields to
6993 be declared register, but reset DECL_REGISTER since it
6994 cannot actually go in a register. */
6995 int was_reg
= C_DECL_REGISTER (decl
);
6996 C_DECL_REGISTER (decl
) = 0;
6997 DECL_REGISTER (decl
) = 0;
6998 c_mark_addressable (decl
);
6999 C_DECL_REGISTER (decl
) = was_reg
;
7002 /* This is the earliest point at which we might know the assembler
7003 name of a variable. Thus, if it's known before this, die horribly. */
7004 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl
));
7008 && TREE_PUBLIC (decl
)
7009 && TREE_STATIC (decl
)
7010 && (RECORD_OR_UNION_TYPE_P (TREE_TYPE (decl
))
7011 || TREE_CODE (TREE_TYPE (decl
)) == ENUMERAL_TYPE
)
7012 && TYPE_NAME (TREE_TYPE (decl
)) == NULL_TREE
)
7013 warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wc___compat
,
7014 ("non-local variable %qD with anonymous type is "
7015 "questionable in C++"),
7022 /* Decode the parameter-list info for a function type or function definition.
7023 The argument is the value returned by `get_parm_info' (or made in c-parse.c
7024 if there is an identifier list instead of a parameter decl list).
7025 These two functions are separate because when a function returns
7026 or receives functions then each is called multiple times but the order
7027 of calls is different. The last call to `grokparms' is always the one
7028 that contains the formal parameter names of a function definition.
7030 Return a list of arg types to use in the FUNCTION_TYPE for this function.
7032 FUNCDEF_FLAG is true for a function definition, false for
7033 a mere declaration. A nonempty identifier-list gets an error message
7034 when FUNCDEF_FLAG is false. */
7037 grokparms (struct c_arg_info
*arg_info
, bool funcdef_flag
)
7039 tree arg_types
= arg_info
->types
;
7041 if (funcdef_flag
&& arg_info
->had_vla_unspec
)
7043 /* A function definition isn't function prototype scope C99 6.2.1p4. */
7045 error ("%<[*]%> not allowed in other than function prototype scope");
7048 if (arg_types
== NULL_TREE
&& !funcdef_flag
7049 && !in_system_header_at (input_location
))
7050 warning (OPT_Wstrict_prototypes
,
7051 "function declaration isn%'t a prototype");
7053 if (arg_types
== error_mark_node
)
7054 /* Don't set TYPE_ARG_TYPES in this case. */
7057 else if (arg_types
&& TREE_CODE (TREE_VALUE (arg_types
)) == IDENTIFIER_NODE
)
7061 pedwarn (input_location
, 0, "parameter names (without types) in "
7062 "function declaration");
7063 arg_info
->parms
= NULL_TREE
;
7066 arg_info
->parms
= arg_info
->types
;
7068 arg_info
->types
= NULL_TREE
;
7073 tree parm
, type
, typelt
;
7074 unsigned int parmno
;
7076 /* If there is a parameter of incomplete type in a definition,
7077 this is an error. In a declaration this is valid, and a
7078 struct or union type may be completed later, before any calls
7079 or definition of the function. In the case where the tag was
7080 first declared within the parameter list, a warning has
7081 already been given. If a parameter has void type, then
7082 however the function cannot be defined or called, so
7085 for (parm
= arg_info
->parms
, typelt
= arg_types
, parmno
= 1;
7087 parm
= DECL_CHAIN (parm
), typelt
= TREE_CHAIN (typelt
), parmno
++)
7089 type
= TREE_VALUE (typelt
);
7090 if (type
== error_mark_node
)
7093 if (!COMPLETE_TYPE_P (type
))
7097 if (DECL_NAME (parm
))
7098 error_at (input_location
,
7099 "parameter %u (%q+D) has incomplete type",
7102 error_at (DECL_SOURCE_LOCATION (parm
),
7103 "parameter %u has incomplete type",
7106 TREE_VALUE (typelt
) = error_mark_node
;
7107 TREE_TYPE (parm
) = error_mark_node
;
7108 arg_types
= NULL_TREE
;
7110 else if (VOID_TYPE_P (type
))
7112 if (DECL_NAME (parm
))
7113 warning_at (input_location
, 0,
7114 "parameter %u (%q+D) has void type",
7117 warning_at (DECL_SOURCE_LOCATION (parm
), 0,
7118 "parameter %u has void type",
7123 if (DECL_NAME (parm
) && TREE_USED (parm
))
7124 warn_if_shadowing (parm
);
7130 /* Allocate and initialize a c_arg_info structure from the parser's
7134 build_arg_info (void)
7136 struct c_arg_info
*ret
= XOBNEW (&parser_obstack
, struct c_arg_info
);
7137 ret
->parms
= NULL_TREE
;
7139 ret
->types
= NULL_TREE
;
7140 ret
->others
= NULL_TREE
;
7141 ret
->pending_sizes
= NULL
;
7142 ret
->had_vla_unspec
= 0;
7146 /* Take apart the current scope and return a c_arg_info structure with
7147 info on a parameter list just parsed.
7149 This structure is later fed to 'grokparms' and 'store_parm_decls'.
7151 ELLIPSIS being true means the argument list ended in '...' so don't
7152 append a sentinel (void_list_node) to the end of the type-list.
7154 EXPR is NULL or an expression that needs to be evaluated for the
7155 side effects of array size expressions in the parameters. */
7158 get_parm_info (bool ellipsis
, tree expr
)
7160 struct c_binding
*b
= current_scope
->bindings
;
7161 struct c_arg_info
*arg_info
= build_arg_info ();
7163 tree parms
= NULL_TREE
;
7164 vec
<c_arg_tag
, va_gc
> *tags
= NULL
;
7165 tree types
= NULL_TREE
;
7166 tree others
= NULL_TREE
;
7168 bool gave_void_only_once_err
= false;
7170 arg_info
->had_vla_unspec
= current_scope
->had_vla_unspec
;
7172 /* The bindings in this scope must not get put into a block.
7173 We will take care of deleting the binding nodes. */
7174 current_scope
->bindings
= 0;
7176 /* This function is only called if there was *something* on the
7180 /* A parameter list consisting solely of 'void' indicates that the
7181 function takes no arguments. But if the 'void' is qualified
7182 (by 'const' or 'volatile'), or has a storage class specifier
7183 ('register'), then the behavior is undefined; issue an error.
7184 Typedefs for 'void' are OK (see DR#157). */
7185 if (b
->prev
== 0 /* one binding */
7186 && TREE_CODE (b
->decl
) == PARM_DECL
/* which is a parameter */
7187 && !DECL_NAME (b
->decl
) /* anonymous */
7188 && VOID_TYPE_P (TREE_TYPE (b
->decl
))) /* of void type */
7190 if (TYPE_QUALS (TREE_TYPE (b
->decl
)) != TYPE_UNQUALIFIED
7191 || C_DECL_REGISTER (b
->decl
))
7192 error_at (b
->locus
, "%<void%> as only parameter may not be qualified");
7194 /* There cannot be an ellipsis. */
7196 error_at (b
->locus
, "%<void%> must be the only parameter");
7198 arg_info
->types
= void_list_node
;
7203 types
= void_list_node
;
7205 /* Break up the bindings list into parms, tags, types, and others;
7206 apply sanity checks; purge the name-to-decl bindings. */
7209 tree decl
= b
->decl
;
7210 tree type
= TREE_TYPE (decl
);
7212 const char *keyword
;
7214 switch (TREE_CODE (decl
))
7219 gcc_assert (I_SYMBOL_BINDING (b
->id
) == b
);
7220 I_SYMBOL_BINDING (b
->id
) = b
->shadowed
;
7223 /* Check for forward decls that never got their actual decl. */
7224 if (TREE_ASM_WRITTEN (decl
))
7226 "parameter %q+D has just a forward declaration", decl
);
7227 /* Check for (..., void, ...) and issue an error. */
7228 else if (VOID_TYPE_P (type
) && !DECL_NAME (decl
))
7230 if (!gave_void_only_once_err
)
7232 error_at (b
->locus
, "%<void%> must be the only parameter");
7233 gave_void_only_once_err
= true;
7238 /* Valid parameter, add it to the list. */
7239 DECL_CHAIN (decl
) = parms
;
7242 /* Since there is a prototype, args are passed in their
7243 declared types. The back end may override this later. */
7244 DECL_ARG_TYPE (decl
) = type
;
7245 types
= tree_cons (0, type
, types
);
7249 case ENUMERAL_TYPE
: keyword
= "enum"; goto tag
;
7250 case UNION_TYPE
: keyword
= "union"; goto tag
;
7251 case RECORD_TYPE
: keyword
= "struct"; goto tag
;
7253 /* Types may not have tag-names, in which case the type
7254 appears in the bindings list with b->id NULL. */
7257 gcc_assert (I_TAG_BINDING (b
->id
) == b
);
7258 I_TAG_BINDING (b
->id
) = b
->shadowed
;
7261 /* Warn about any struct, union or enum tags defined in a
7262 parameter list. The scope of such types is limited to
7263 the parameter list, which is rarely if ever desirable
7264 (it's impossible to call such a function with type-
7265 correct arguments). An anonymous union parm type is
7266 meaningful as a GNU extension, so don't warn for that. */
7267 if (TREE_CODE (decl
) != UNION_TYPE
|| b
->id
!= NULL_TREE
)
7270 /* The %s will be one of 'struct', 'union', or 'enum'. */
7271 warning_at (b
->locus
, 0,
7272 "%<%s %E%> declared inside parameter list"
7273 " will not be visible outside of this definition or"
7274 " declaration", keyword
, b
->id
);
7276 /* The %s will be one of 'struct', 'union', or 'enum'. */
7277 warning_at (b
->locus
, 0,
7278 "anonymous %s declared inside parameter list"
7279 " will not be visible outside of this definition or"
7280 " declaration", keyword
);
7285 vec_safe_push (tags
, tag
);
7289 /* FUNCTION_DECLs appear when there is an implicit function
7290 declaration in the parameter list. */
7291 gcc_assert (b
->nested
|| seen_error ());
7296 /* CONST_DECLs appear here when we have an embedded enum,
7297 and TYPE_DECLs appear here when we have an embedded struct
7298 or union. No warnings for this - we already warned about the
7301 /* When we reinsert this decl in the function body, we need
7302 to reconstruct whether it was marked as nested. */
7303 gcc_assert (!b
->nested
);
7304 DECL_CHAIN (decl
) = others
;
7310 /* error_mark_node appears here when we have an undeclared
7311 variable. Just throw it away. */
7314 gcc_assert (I_SYMBOL_BINDING (b
->id
) == b
);
7315 I_SYMBOL_BINDING (b
->id
) = b
->shadowed
;
7319 /* Other things that might be encountered. */
7326 b
= free_binding_and_advance (b
);
7329 arg_info
->parms
= parms
;
7330 arg_info
->tags
= tags
;
7331 arg_info
->types
= types
;
7332 arg_info
->others
= others
;
7333 arg_info
->pending_sizes
= expr
;
7337 /* Get the struct, enum or union (CODE says which) with tag NAME.
7338 Define the tag as a forward-reference with location LOC if it is
7339 not defined. Return a c_typespec structure for the type
7343 parser_xref_tag (location_t loc
, enum tree_code code
, tree name
)
7345 struct c_typespec ret
;
7349 ret
.expr
= NULL_TREE
;
7350 ret
.expr_const_operands
= true;
7352 /* If a cross reference is requested, look up the type
7353 already defined for this tag and return it. */
7355 ref
= lookup_tag (code
, name
, false, &refloc
);
7356 /* If this is the right type of tag, return what we found.
7357 (This reference will be shadowed by shadow_tag later if appropriate.)
7358 If this is the wrong type of tag, do not return it. If it was the
7359 wrong type in the same scope, we will have had an error
7360 message already; if in a different scope and declaring
7361 a name, pending_xref_error will give an error message; but if in a
7362 different scope and not declaring a name, this tag should
7363 shadow the previous declaration of a different type of tag, and
7364 this would not work properly if we return the reference found.
7365 (For example, with "struct foo" in an outer scope, "union foo;"
7366 must shadow that tag with a new one of union type.) */
7367 ret
.kind
= (ref
? ctsk_tagref
: ctsk_tagfirstref
);
7368 if (ref
&& TREE_CODE (ref
) == code
)
7370 if (C_TYPE_DEFINED_IN_STRUCT (ref
)
7371 && loc
!= UNKNOWN_LOCATION
7377 warning_at (loc
, OPT_Wc___compat
,
7378 ("enum type defined in struct or union "
7379 "is not visible in C++"));
7380 inform (refloc
, "enum type defined here");
7383 warning_at (loc
, OPT_Wc___compat
,
7384 ("struct defined in struct or union "
7385 "is not visible in C++"));
7386 inform (refloc
, "struct defined here");
7389 warning_at (loc
, OPT_Wc___compat
,
7390 ("union defined in struct or union "
7391 "is not visible in C++"));
7392 inform (refloc
, "union defined here");
7403 /* If no such tag is yet defined, create a forward-reference node
7404 and record it as the "definition".
7405 When a real declaration of this type is found,
7406 the forward-reference will be altered into a real type. */
7408 ref
= make_node (code
);
7409 if (code
== ENUMERAL_TYPE
)
7411 /* Give the type a default layout like unsigned int
7412 to avoid crashing if it does not get defined. */
7413 SET_TYPE_MODE (ref
, TYPE_MODE (unsigned_type_node
));
7414 SET_TYPE_ALIGN (ref
, TYPE_ALIGN (unsigned_type_node
));
7415 TYPE_USER_ALIGN (ref
) = 0;
7416 TYPE_UNSIGNED (ref
) = 1;
7417 TYPE_PRECISION (ref
) = TYPE_PRECISION (unsigned_type_node
);
7418 TYPE_MIN_VALUE (ref
) = TYPE_MIN_VALUE (unsigned_type_node
);
7419 TYPE_MAX_VALUE (ref
) = TYPE_MAX_VALUE (unsigned_type_node
);
7422 pushtag (loc
, name
, ref
);
7428 /* Get the struct, enum or union (CODE says which) with tag NAME.
7429 Define the tag as a forward-reference if it is not defined.
7430 Return a tree for the type. */
7433 xref_tag (enum tree_code code
, tree name
)
7435 return parser_xref_tag (input_location
, code
, name
).spec
;
7438 /* Make sure that the tag NAME is defined *in the current scope*
7439 at least as a forward reference.
7440 LOC is the location of the struct's definition.
7441 CODE says which kind of tag NAME ought to be.
7443 This stores the current value of the file static STRUCT_PARSE_INFO
7444 in *ENCLOSING_STRUCT_PARSE_INFO, and points STRUCT_PARSE_INFO at a
7445 new c_struct_parse_info structure. The old value of
7446 STRUCT_PARSE_INFO is restored in finish_struct. */
7449 start_struct (location_t loc
, enum tree_code code
, tree name
,
7450 struct c_struct_parse_info
**enclosing_struct_parse_info
)
7452 /* If there is already a tag defined at this scope
7453 (as a forward reference), just return it. */
7455 tree ref
= NULL_TREE
;
7456 location_t refloc
= UNKNOWN_LOCATION
;
7458 if (name
!= NULL_TREE
)
7459 ref
= lookup_tag (code
, name
, true, &refloc
);
7460 if (ref
&& TREE_CODE (ref
) == code
)
7462 if (TYPE_STUB_DECL (ref
))
7463 refloc
= DECL_SOURCE_LOCATION (TYPE_STUB_DECL (ref
));
7465 if (TYPE_SIZE (ref
))
7467 if (code
== UNION_TYPE
)
7468 error_at (loc
, "redefinition of %<union %E%>", name
);
7470 error_at (loc
, "redefinition of %<struct %E%>", name
);
7471 if (refloc
!= UNKNOWN_LOCATION
)
7472 inform (refloc
, "originally defined here");
7473 /* Don't create structures using a name already in use. */
7476 else if (C_TYPE_BEING_DEFINED (ref
))
7478 if (code
== UNION_TYPE
)
7479 error_at (loc
, "nested redefinition of %<union %E%>", name
);
7481 error_at (loc
, "nested redefinition of %<struct %E%>", name
);
7482 /* Don't bother to report "originally defined here" for a
7483 nested redefinition; the original definition should be
7485 /* Don't create structures that contain themselves. */
7490 /* Otherwise create a forward-reference just so the tag is in scope. */
7492 if (ref
== NULL_TREE
|| TREE_CODE (ref
) != code
)
7494 ref
= make_node (code
);
7495 pushtag (loc
, name
, ref
);
7498 C_TYPE_BEING_DEFINED (ref
) = 1;
7499 for (tree v
= TYPE_MAIN_VARIANT (ref
); v
; v
= TYPE_NEXT_VARIANT (v
))
7500 TYPE_PACKED (v
) = flag_pack_struct
;
7502 *enclosing_struct_parse_info
= struct_parse_info
;
7503 struct_parse_info
= new c_struct_parse_info ();
7505 /* FIXME: This will issue a warning for a use of a type defined
7506 within a statement expr used within sizeof, et. al. This is not
7507 terribly serious as C++ doesn't permit statement exprs within
7509 if (warn_cxx_compat
&& (in_sizeof
|| in_typeof
|| in_alignof
))
7510 warning_at (loc
, OPT_Wc___compat
,
7511 "defining type in %qs expression is invalid in C++",
7514 : (in_typeof
? "typeof" : "alignof")));
7519 /* Process the specs, declarator and width (NULL if omitted)
7520 of a structure component, returning a FIELD_DECL node.
7521 WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node.
7522 DECL_ATTRS is as for grokdeclarator.
7524 LOC is the location of the structure component.
7526 This is done during the parsing of the struct declaration.
7527 The FIELD_DECL nodes are chained together and the lot of them
7528 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
7531 grokfield (location_t loc
,
7532 struct c_declarator
*declarator
, struct c_declspecs
*declspecs
,
7533 tree width
, tree
*decl_attrs
)
7537 if (declarator
->kind
== cdk_id
&& declarator
->u
.id
== NULL_TREE
7538 && width
== NULL_TREE
)
7540 /* This is an unnamed decl.
7542 If we have something of the form "union { list } ;" then this
7543 is the anonymous union extension. Similarly for struct.
7545 If this is something of the form "struct foo;", then
7546 If MS or Plan 9 extensions are enabled, this is handled as
7547 an anonymous struct.
7548 Otherwise this is a forward declaration of a structure tag.
7550 If this is something of the form "foo;" and foo is a TYPE_DECL, then
7551 If foo names a structure or union without a tag, then this
7552 is an anonymous struct (this is permitted by C11).
7553 If MS or Plan 9 extensions are enabled and foo names a
7554 structure, then again this is an anonymous struct.
7555 Otherwise this is an error.
7557 Oh what a horrid tangled web we weave. I wonder if MS consciously
7558 took this from Plan 9 or if it was an accident of implementation
7559 that took root before someone noticed the bug... */
7561 tree type
= declspecs
->type
;
7564 if (RECORD_OR_UNION_TYPE_P (type
)
7565 && (flag_ms_extensions
7566 || flag_plan9_extensions
7567 || !declspecs
->typedef_p
))
7569 if (flag_ms_extensions
|| flag_plan9_extensions
)
7571 else if (TYPE_NAME (type
) == NULL
)
7578 pedwarn (loc
, 0, "declaration does not declare anything");
7582 pedwarn_c99 (loc
, OPT_Wpedantic
,
7583 "ISO C99 doesn%'t support unnamed structs/unions");
7585 pedwarn_c99 (loc
, OPT_Wpedantic
,
7586 "ISO C90 doesn%'t support unnamed structs/unions");
7589 value
= grokdeclarator (declarator
, declspecs
, FIELD
, false,
7590 width
? &width
: NULL
, decl_attrs
, NULL
, NULL
,
7593 finish_decl (value
, loc
, NULL_TREE
, NULL_TREE
, NULL_TREE
);
7594 DECL_INITIAL (value
) = width
;
7596 if (warn_cxx_compat
&& DECL_NAME (value
) != NULL_TREE
)
7598 /* If we currently have a binding for this field, set the
7599 in_struct field in the binding, so that we warn about lookups
7601 struct c_binding
*b
= I_SYMBOL_BINDING (DECL_NAME (value
));
7604 /* If the in_struct field is not yet set, push it on a list
7605 to be cleared when this struct is finished. */
7608 struct_parse_info
->fields
.safe_push (b
);
7617 /* Subroutine of detect_field_duplicates: return whether X and Y,
7618 which are both fields in the same struct, have duplicate field
7622 is_duplicate_field (tree x
, tree y
)
7624 if (DECL_NAME (x
) != NULL_TREE
&& DECL_NAME (x
) == DECL_NAME (y
))
7627 /* When using -fplan9-extensions, an anonymous field whose name is a
7628 typedef can duplicate a field name. */
7629 if (flag_plan9_extensions
7630 && (DECL_NAME (x
) == NULL_TREE
|| DECL_NAME (y
) == NULL_TREE
))
7632 tree xt
, xn
, yt
, yn
;
7635 if (DECL_NAME (x
) != NULL_TREE
)
7637 else if (RECORD_OR_UNION_TYPE_P (xt
)
7638 && TYPE_NAME (xt
) != NULL_TREE
7639 && TREE_CODE (TYPE_NAME (xt
)) == TYPE_DECL
)
7640 xn
= DECL_NAME (TYPE_NAME (xt
));
7645 if (DECL_NAME (y
) != NULL_TREE
)
7647 else if (RECORD_OR_UNION_TYPE_P (yt
)
7648 && TYPE_NAME (yt
) != NULL_TREE
7649 && TREE_CODE (TYPE_NAME (yt
)) == TYPE_DECL
)
7650 yn
= DECL_NAME (TYPE_NAME (yt
));
7654 if (xn
!= NULL_TREE
&& xn
== yn
)
7661 /* Subroutine of detect_field_duplicates: add the fields of FIELDLIST
7662 to HTAB, giving errors for any duplicates. */
7665 detect_field_duplicates_hash (tree fieldlist
,
7666 hash_table
<nofree_ptr_hash
<tree_node
> > *htab
)
7671 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
7672 if ((y
= DECL_NAME (x
)) != NULL_TREE
)
7674 slot
= htab
->find_slot (y
, INSERT
);
7677 error ("duplicate member %q+D", x
);
7678 DECL_NAME (x
) = NULL_TREE
;
7682 else if (RECORD_OR_UNION_TYPE_P (TREE_TYPE (x
)))
7684 detect_field_duplicates_hash (TYPE_FIELDS (TREE_TYPE (x
)), htab
);
7686 /* When using -fplan9-extensions, an anonymous field whose
7687 name is a typedef can duplicate a field name. */
7688 if (flag_plan9_extensions
7689 && TYPE_NAME (TREE_TYPE (x
)) != NULL_TREE
7690 && TREE_CODE (TYPE_NAME (TREE_TYPE (x
))) == TYPE_DECL
)
7692 tree xn
= DECL_NAME (TYPE_NAME (TREE_TYPE (x
)));
7693 slot
= htab
->find_slot (xn
, INSERT
);
7695 error ("duplicate member %q+D", TYPE_NAME (TREE_TYPE (x
)));
7701 /* Generate an error for any duplicate field names in FIELDLIST. Munge
7702 the list such that this does not present a problem later. */
7705 detect_field_duplicates (tree fieldlist
)
7710 /* If the struct is the list of instance variables of an Objective-C
7711 class, then we need to check all the instance variables of
7712 superclasses when checking for duplicates (since you can't have
7713 an instance variable in a subclass with the same name as an
7714 instance variable in a superclass). We pass on this job to the
7715 Objective-C compiler. objc_detect_field_duplicates() will return
7716 false if we are not checking the list of instance variables and
7717 the C frontend should proceed with the standard field duplicate
7718 checks. If we are checking the list of instance variables, the
7719 ObjC frontend will do the check, emit the errors if needed, and
7720 then return true. */
7721 if (c_dialect_objc ())
7722 if (objc_detect_field_duplicates (false))
7725 /* First, see if there are more than "a few" fields.
7726 This is trivially true if there are zero or one fields. */
7727 if (!fieldlist
|| !DECL_CHAIN (fieldlist
))
7732 if (DECL_NAME (x
) == NULL_TREE
7733 && RECORD_OR_UNION_TYPE_P (TREE_TYPE (x
)))
7736 } while (timeout
> 0 && x
);
7738 /* If there were "few" fields and no anonymous structures or unions,
7739 avoid the overhead of allocating a hash table. Instead just do
7740 the nested traversal thing. */
7743 for (x
= DECL_CHAIN (fieldlist
); x
; x
= DECL_CHAIN (x
))
7744 /* When using -fplan9-extensions, we can have duplicates
7745 between typedef names and fields. */
7747 || (flag_plan9_extensions
7748 && DECL_NAME (x
) == NULL_TREE
7749 && RECORD_OR_UNION_TYPE_P (TREE_TYPE (x
))
7750 && TYPE_NAME (TREE_TYPE (x
)) != NULL_TREE
7751 && TREE_CODE (TYPE_NAME (TREE_TYPE (x
))) == TYPE_DECL
))
7753 for (y
= fieldlist
; y
!= x
; y
= TREE_CHAIN (y
))
7754 if (is_duplicate_field (y
, x
))
7756 error ("duplicate member %q+D", x
);
7757 DECL_NAME (x
) = NULL_TREE
;
7763 hash_table
<nofree_ptr_hash
<tree_node
> > htab (37);
7764 detect_field_duplicates_hash (fieldlist
, &htab
);
7768 /* Finish up struct info used by -Wc++-compat. */
7771 warn_cxx_compat_finish_struct (tree fieldlist
, enum tree_code code
,
7772 location_t record_loc
)
7776 struct c_binding
*b
;
7778 if (fieldlist
== NULL_TREE
)
7780 if (code
== RECORD_TYPE
)
7781 warning_at (record_loc
, OPT_Wc___compat
,
7782 "empty struct has size 0 in C, size 1 in C++");
7784 warning_at (record_loc
, OPT_Wc___compat
,
7785 "empty union has size 0 in C, size 1 in C++");
7788 /* Set the C_TYPE_DEFINED_IN_STRUCT flag for each type defined in
7789 the current struct. We do this now at the end of the struct
7790 because the flag is used to issue visibility warnings, and we
7791 only want to issue those warnings if the type is referenced
7792 outside of the struct declaration. */
7793 FOR_EACH_VEC_ELT (struct_parse_info
->struct_types
, ix
, x
)
7794 C_TYPE_DEFINED_IN_STRUCT (x
) = 1;
7796 /* The TYPEDEFS_SEEN field of STRUCT_PARSE_INFO is a list of
7797 typedefs used when declaring fields in this struct. If the name
7798 of any of the fields is also a typedef name then the struct would
7799 not parse in C++, because the C++ lookup rules say that the
7800 typedef name would be looked up in the context of the struct, and
7801 would thus be the field rather than the typedef. */
7802 if (!struct_parse_info
->typedefs_seen
.is_empty ()
7803 && fieldlist
!= NULL_TREE
)
7805 /* Use a hash_set<tree> using the name of the typedef. We can use
7806 a hash_set<tree> because identifiers are interned. */
7807 hash_set
<tree
> tset
;
7809 FOR_EACH_VEC_ELT (struct_parse_info
->typedefs_seen
, ix
, x
)
7810 tset
.add (DECL_NAME (x
));
7812 for (x
= fieldlist
; x
!= NULL_TREE
; x
= DECL_CHAIN (x
))
7814 if (DECL_NAME (x
) != NULL_TREE
7815 && tset
.contains (DECL_NAME (x
)))
7817 warning_at (DECL_SOURCE_LOCATION (x
), OPT_Wc___compat
,
7818 ("using %qD as both field and typedef name is "
7821 /* FIXME: It would be nice to report the location where
7822 the typedef name is used. */
7827 /* For each field which has a binding and which was not defined in
7828 an enclosing struct, clear the in_struct field. */
7829 FOR_EACH_VEC_ELT (struct_parse_info
->fields
, ix
, b
)
7833 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
7834 LOC is the location of the RECORD_TYPE or UNION_TYPE's definition.
7835 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
7836 ATTRIBUTES are attributes to be applied to the structure.
7838 ENCLOSING_STRUCT_PARSE_INFO is the value of STRUCT_PARSE_INFO when
7839 the struct was started. */
7842 finish_struct (location_t loc
, tree t
, tree fieldlist
, tree attributes
,
7843 struct c_struct_parse_info
*enclosing_struct_parse_info
)
7846 bool toplevel
= file_scope
== current_scope
;
7848 /* If this type was previously laid out as a forward reference,
7849 make sure we lay it out again. */
7851 TYPE_SIZE (t
) = NULL_TREE
;
7853 decl_attributes (&t
, attributes
, (int) ATTR_FLAG_TYPE_IN_PLACE
);
7857 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
7859 if (DECL_NAME (x
) != NULL_TREE
)
7861 if (flag_isoc11
&& RECORD_OR_UNION_TYPE_P (TREE_TYPE (x
)))
7867 if (TREE_CODE (t
) == UNION_TYPE
)
7870 pedwarn (loc
, OPT_Wpedantic
, "union has no named members");
7872 pedwarn (loc
, OPT_Wpedantic
, "union has no members");
7877 pedwarn (loc
, OPT_Wpedantic
, "struct has no named members");
7879 pedwarn (loc
, OPT_Wpedantic
, "struct has no members");
7884 /* Install struct as DECL_CONTEXT of each field decl.
7885 Also process specified field sizes, found in the DECL_INITIAL,
7886 storing 0 there after the type has been changed to precision equal
7887 to its width, rather than the precision of the specified standard
7888 type. (Correct layout requires the original type to have been preserved
7891 bool saw_named_field
= false;
7892 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
7894 if (TREE_TYPE (x
) == error_mark_node
)
7897 DECL_CONTEXT (x
) = t
;
7899 /* If any field is const, the structure type is pseudo-const. */
7900 if (TREE_READONLY (x
))
7901 C_TYPE_FIELDS_READONLY (t
) = 1;
7904 /* A field that is pseudo-const makes the structure likewise. */
7905 tree t1
= strip_array_types (TREE_TYPE (x
));
7906 if (RECORD_OR_UNION_TYPE_P (t1
) && C_TYPE_FIELDS_READONLY (t1
))
7907 C_TYPE_FIELDS_READONLY (t
) = 1;
7910 /* Any field that is volatile means variables of this type must be
7911 treated in some ways as volatile. */
7912 if (TREE_THIS_VOLATILE (x
))
7913 C_TYPE_FIELDS_VOLATILE (t
) = 1;
7915 /* Any field of nominal variable size implies structure is too. */
7916 if (C_DECL_VARIABLE_SIZE (x
))
7917 C_TYPE_VARIABLE_SIZE (t
) = 1;
7919 if (DECL_INITIAL (x
))
7921 unsigned HOST_WIDE_INT width
= tree_to_uhwi (DECL_INITIAL (x
));
7922 DECL_SIZE (x
) = bitsize_int (width
);
7923 DECL_BIT_FIELD (x
) = 1;
7924 SET_DECL_C_BIT_FIELD (x
);
7928 && (DECL_BIT_FIELD (x
)
7929 || TYPE_ALIGN (TREE_TYPE (x
)) > BITS_PER_UNIT
))
7930 DECL_PACKED (x
) = 1;
7932 /* Detect flexible array member in an invalid context. */
7933 if (TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
7934 && TYPE_SIZE (TREE_TYPE (x
)) == NULL_TREE
7935 && TYPE_DOMAIN (TREE_TYPE (x
)) != NULL_TREE
7936 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x
))) == NULL_TREE
)
7938 if (TREE_CODE (t
) == UNION_TYPE
)
7940 error_at (DECL_SOURCE_LOCATION (x
),
7941 "flexible array member in union");
7942 TREE_TYPE (x
) = error_mark_node
;
7944 else if (DECL_CHAIN (x
) != NULL_TREE
)
7946 error_at (DECL_SOURCE_LOCATION (x
),
7947 "flexible array member not at end of struct");
7948 TREE_TYPE (x
) = error_mark_node
;
7950 else if (!saw_named_field
)
7952 error_at (DECL_SOURCE_LOCATION (x
),
7953 "flexible array member in a struct with no named "
7955 TREE_TYPE (x
) = error_mark_node
;
7959 if (pedantic
&& TREE_CODE (t
) == RECORD_TYPE
7960 && flexible_array_type_p (TREE_TYPE (x
)))
7961 pedwarn (DECL_SOURCE_LOCATION (x
), OPT_Wpedantic
,
7962 "invalid use of structure with flexible array member");
7965 || RECORD_OR_UNION_TYPE_P (TREE_TYPE (x
)))
7966 saw_named_field
= true;
7969 detect_field_duplicates (fieldlist
);
7971 /* Now we have the nearly final fieldlist. Record it,
7972 then lay out the structure or union (including the fields). */
7974 TYPE_FIELDS (t
) = fieldlist
;
7976 maybe_apply_pragma_scalar_storage_order (t
);
7980 if (TYPE_SIZE_UNIT (t
)
7981 && TREE_CODE (TYPE_SIZE_UNIT (t
)) == INTEGER_CST
7982 && !TREE_OVERFLOW (TYPE_SIZE_UNIT (t
))
7983 && !valid_constant_size_p (TYPE_SIZE_UNIT (t
)))
7984 error ("type %qT is too large", t
);
7986 /* Give bit-fields their proper types and rewrite the type of array fields
7987 with scalar component if the enclosing type has reverse storage order. */
7988 for (tree field
= fieldlist
; field
; field
= DECL_CHAIN (field
))
7990 if (TREE_CODE (field
) == FIELD_DECL
7991 && DECL_INITIAL (field
)
7992 && TREE_TYPE (field
) != error_mark_node
)
7994 unsigned HOST_WIDE_INT width
7995 = tree_to_uhwi (DECL_INITIAL (field
));
7996 tree type
= TREE_TYPE (field
);
7997 if (width
!= TYPE_PRECISION (type
))
8000 = c_build_bitfield_integer_type (width
, TYPE_UNSIGNED (type
));
8001 SET_DECL_MODE (field
, TYPE_MODE (TREE_TYPE (field
)));
8003 DECL_INITIAL (field
) = NULL_TREE
;
8005 else if (TYPE_REVERSE_STORAGE_ORDER (t
)
8006 && TREE_CODE (field
) == FIELD_DECL
8007 && TREE_CODE (TREE_TYPE (field
)) == ARRAY_TYPE
)
8009 tree ftype
= TREE_TYPE (field
);
8010 tree ctype
= strip_array_types (ftype
);
8011 if (!RECORD_OR_UNION_TYPE_P (ctype
) && TYPE_MODE (ctype
) != QImode
)
8013 tree fmain_type
= TYPE_MAIN_VARIANT (ftype
);
8014 tree
*typep
= &fmain_type
;
8016 *typep
= build_distinct_type_copy (*typep
);
8017 TYPE_REVERSE_STORAGE_ORDER (*typep
) = 1;
8018 typep
= &TREE_TYPE (*typep
);
8019 } while (TREE_CODE (*typep
) == ARRAY_TYPE
);
8021 = c_build_qualified_type (fmain_type
, TYPE_QUALS (ftype
));
8026 /* Now we have the truly final field list.
8027 Store it in this type and in the variants. */
8029 TYPE_FIELDS (t
) = fieldlist
;
8031 /* If there are lots of fields, sort so we can look through them fast.
8032 We arbitrarily consider 16 or more elts to be "a lot". */
8037 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
8039 if (len
> 15 || DECL_NAME (x
) == NULL
)
8047 struct lang_type
*space
;
8048 struct sorted_fields_type
*space2
;
8050 len
+= list_length (x
);
8052 /* Use the same allocation policy here that make_node uses, to
8053 ensure that this lives as long as the rest of the struct decl.
8054 All decls in an inline function need to be saved. */
8056 space
= ggc_cleared_alloc
<struct lang_type
> ();
8057 space2
= (sorted_fields_type
*) ggc_internal_alloc
8058 (sizeof (struct sorted_fields_type
) + len
* sizeof (tree
));
8062 field_array
= &space2
->elts
[0];
8063 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
8065 field_array
[len
++] = x
;
8067 /* If there is anonymous struct or union, break out of the loop. */
8068 if (DECL_NAME (x
) == NULL
)
8071 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
8074 TYPE_LANG_SPECIFIC (t
) = space
;
8075 TYPE_LANG_SPECIFIC (t
)->s
->len
= len
;
8076 field_array
= TYPE_LANG_SPECIFIC (t
)->s
->elts
;
8077 qsort (field_array
, len
, sizeof (tree
), field_decl_cmp
);
8082 /* Note: C_TYPE_INCOMPLETE_VARS overloads TYPE_VFIELD which is used
8083 in dwarf2out via rest_of_decl_compilation below and means
8084 something totally different. Since we will be clearing
8085 C_TYPE_INCOMPLETE_VARS shortly after we iterate through them,
8086 clear it ahead of time and avoid problems in dwarf2out. Ideally,
8087 C_TYPE_INCOMPLETE_VARS should use some language specific
8089 tree incomplete_vars
= C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t
));
8090 for (x
= TYPE_MAIN_VARIANT (t
); x
; x
= TYPE_NEXT_VARIANT (x
))
8092 TYPE_FIELDS (x
) = TYPE_FIELDS (t
);
8093 TYPE_LANG_SPECIFIC (x
) = TYPE_LANG_SPECIFIC (t
);
8094 C_TYPE_FIELDS_READONLY (x
) = C_TYPE_FIELDS_READONLY (t
);
8095 C_TYPE_FIELDS_VOLATILE (x
) = C_TYPE_FIELDS_VOLATILE (t
);
8096 C_TYPE_VARIABLE_SIZE (x
) = C_TYPE_VARIABLE_SIZE (t
);
8097 C_TYPE_INCOMPLETE_VARS (x
) = NULL_TREE
;
8100 /* If this was supposed to be a transparent union, but we can't
8101 make it one, warn and turn off the flag. */
8102 if (TREE_CODE (t
) == UNION_TYPE
8103 && TYPE_TRANSPARENT_AGGR (t
)
8104 && (!TYPE_FIELDS (t
) || TYPE_MODE (t
) != DECL_MODE (TYPE_FIELDS (t
))))
8106 TYPE_TRANSPARENT_AGGR (t
) = 0;
8107 warning_at (loc
, 0, "union cannot be made transparent");
8110 /* If this structure or union completes the type of any previous
8111 variable declaration, lay it out and output its rtl. */
8112 for (x
= incomplete_vars
; x
; x
= TREE_CHAIN (x
))
8114 tree decl
= TREE_VALUE (x
);
8115 if (TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
)
8116 layout_array_type (TREE_TYPE (decl
));
8117 if (TREE_CODE (decl
) != TYPE_DECL
)
8119 layout_decl (decl
, 0);
8120 if (c_dialect_objc ())
8121 objc_check_decl (decl
);
8122 rest_of_decl_compilation (decl
, toplevel
, 0);
8126 /* Update type location to the one of the definition, instead of e.g.
8127 a forward declaration. */
8128 if (TYPE_STUB_DECL (t
))
8129 DECL_SOURCE_LOCATION (TYPE_STUB_DECL (t
)) = loc
;
8131 /* Finish debugging output for this type. */
8132 rest_of_type_compilation (t
, toplevel
);
8134 /* If we're inside a function proper, i.e. not file-scope and not still
8135 parsing parameters, then arrange for the size of a variable sized type
8137 if (building_stmt_list_p () && variably_modified_type_p (t
, NULL_TREE
))
8138 add_stmt (build_stmt (loc
,
8139 DECL_EXPR
, build_decl (loc
, TYPE_DECL
, NULL
, t
)));
8141 if (warn_cxx_compat
)
8142 warn_cxx_compat_finish_struct (fieldlist
, TREE_CODE (t
), loc
);
8144 delete struct_parse_info
;
8146 struct_parse_info
= enclosing_struct_parse_info
;
8148 /* If this struct is defined inside a struct, add it to
8151 && struct_parse_info
!= NULL
8152 && !in_sizeof
&& !in_typeof
&& !in_alignof
)
8153 struct_parse_info
->struct_types
.safe_push (t
);
8158 /* Lay out the type T, and its element type, and so on. */
8161 layout_array_type (tree t
)
8163 if (TREE_CODE (TREE_TYPE (t
)) == ARRAY_TYPE
)
8164 layout_array_type (TREE_TYPE (t
));
8168 /* Begin compiling the definition of an enumeration type.
8169 NAME is its name (or null if anonymous).
8170 LOC is the enum's location.
8171 Returns the type object, as yet incomplete.
8172 Also records info about it so that build_enumerator
8173 may be used to declare the individual values as they are read. */
8176 start_enum (location_t loc
, struct c_enum_contents
*the_enum
, tree name
)
8178 tree enumtype
= NULL_TREE
;
8179 location_t enumloc
= UNKNOWN_LOCATION
;
8181 /* If this is the real definition for a previous forward reference,
8182 fill in the contents in the same object that used to be the
8183 forward reference. */
8185 if (name
!= NULL_TREE
)
8186 enumtype
= lookup_tag (ENUMERAL_TYPE
, name
, true, &enumloc
);
8188 if (enumtype
== NULL_TREE
|| TREE_CODE (enumtype
) != ENUMERAL_TYPE
)
8190 enumtype
= make_node (ENUMERAL_TYPE
);
8191 pushtag (loc
, name
, enumtype
);
8193 /* Update type location to the one of the definition, instead of e.g.
8194 a forward declaration. */
8195 else if (TYPE_STUB_DECL (enumtype
))
8197 enumloc
= DECL_SOURCE_LOCATION (TYPE_STUB_DECL (enumtype
));
8198 DECL_SOURCE_LOCATION (TYPE_STUB_DECL (enumtype
)) = loc
;
8201 if (C_TYPE_BEING_DEFINED (enumtype
))
8202 error_at (loc
, "nested redefinition of %<enum %E%>", name
);
8204 C_TYPE_BEING_DEFINED (enumtype
) = 1;
8206 if (TYPE_VALUES (enumtype
) != NULL_TREE
)
8208 /* This enum is a named one that has been declared already. */
8209 error_at (loc
, "redeclaration of %<enum %E%>", name
);
8210 if (enumloc
!= UNKNOWN_LOCATION
)
8211 inform (enumloc
, "originally defined here");
8213 /* Completely replace its old definition.
8214 The old enumerators remain defined, however. */
8215 TYPE_VALUES (enumtype
) = NULL_TREE
;
8218 the_enum
->enum_next_value
= integer_zero_node
;
8219 the_enum
->enum_overflow
= 0;
8221 if (flag_short_enums
)
8222 for (tree v
= TYPE_MAIN_VARIANT (enumtype
); v
; v
= TYPE_NEXT_VARIANT (v
))
8223 TYPE_PACKED (v
) = 1;
8225 /* FIXME: This will issue a warning for a use of a type defined
8226 within sizeof in a statement expr. This is not terribly serious
8227 as C++ doesn't permit statement exprs within sizeof anyhow. */
8228 if (warn_cxx_compat
&& (in_sizeof
|| in_typeof
|| in_alignof
))
8229 warning_at (loc
, OPT_Wc___compat
,
8230 "defining type in %qs expression is invalid in C++",
8233 : (in_typeof
? "typeof" : "alignof")));
8238 /* After processing and defining all the values of an enumeration type,
8239 install their decls in the enumeration type and finish it off.
8240 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
8241 and ATTRIBUTES are the specified attributes.
8242 Returns ENUMTYPE. */
8245 finish_enum (tree enumtype
, tree values
, tree attributes
)
8248 tree minnode
= NULL_TREE
, maxnode
= NULL_TREE
;
8251 bool toplevel
= (file_scope
== current_scope
);
8252 struct lang_type
*lt
;
8254 decl_attributes (&enumtype
, attributes
, (int) ATTR_FLAG_TYPE_IN_PLACE
);
8256 /* Calculate the maximum value of any enumerator in this type. */
8258 if (values
== error_mark_node
)
8259 minnode
= maxnode
= integer_zero_node
;
8262 minnode
= maxnode
= TREE_VALUE (values
);
8263 for (pair
= TREE_CHAIN (values
); pair
; pair
= TREE_CHAIN (pair
))
8265 tree value
= TREE_VALUE (pair
);
8266 if (tree_int_cst_lt (maxnode
, value
))
8268 if (tree_int_cst_lt (value
, minnode
))
8273 /* Construct the final type of this enumeration. It is the same
8274 as one of the integral types - the narrowest one that fits, except
8275 that normally we only go as narrow as int - and signed iff any of
8276 the values are negative. */
8277 sign
= (tree_int_cst_sgn (minnode
) >= 0) ? UNSIGNED
: SIGNED
;
8278 precision
= MAX (tree_int_cst_min_precision (minnode
, sign
),
8279 tree_int_cst_min_precision (maxnode
, sign
));
8281 /* If the precision of the type was specified with an attribute and it
8282 was too small, give an error. Otherwise, use it. */
8283 if (TYPE_PRECISION (enumtype
) && lookup_attribute ("mode", attributes
))
8285 if (precision
> TYPE_PRECISION (enumtype
))
8287 TYPE_PRECISION (enumtype
) = 0;
8288 error ("specified mode too small for enumeral values");
8291 precision
= TYPE_PRECISION (enumtype
);
8294 TYPE_PRECISION (enumtype
) = 0;
8296 if (TYPE_PACKED (enumtype
)
8297 || precision
> TYPE_PRECISION (integer_type_node
)
8298 || TYPE_PRECISION (enumtype
))
8300 tem
= c_common_type_for_size (precision
, sign
== UNSIGNED
? 1 : 0);
8303 warning (0, "enumeration values exceed range of largest integer");
8304 tem
= long_long_integer_type_node
;
8308 tem
= sign
== UNSIGNED
? unsigned_type_node
: integer_type_node
;
8310 TYPE_MIN_VALUE (enumtype
) = TYPE_MIN_VALUE (tem
);
8311 TYPE_MAX_VALUE (enumtype
) = TYPE_MAX_VALUE (tem
);
8312 TYPE_UNSIGNED (enumtype
) = TYPE_UNSIGNED (tem
);
8313 SET_TYPE_ALIGN (enumtype
, TYPE_ALIGN (tem
));
8314 TYPE_SIZE (enumtype
) = NULL_TREE
;
8315 TYPE_PRECISION (enumtype
) = TYPE_PRECISION (tem
);
8317 layout_type (enumtype
);
8319 if (values
!= error_mark_node
)
8321 /* Change the type of the enumerators to be the enum type. We
8322 need to do this irrespective of the size of the enum, for
8323 proper type checking. Replace the DECL_INITIALs of the
8324 enumerators, and the value slots of the list, with copies
8325 that have the enum type; they cannot be modified in place
8326 because they may be shared (e.g. integer_zero_node) Finally,
8327 change the purpose slots to point to the names of the decls. */
8328 for (pair
= values
; pair
; pair
= TREE_CHAIN (pair
))
8330 tree enu
= TREE_PURPOSE (pair
);
8331 tree ini
= DECL_INITIAL (enu
);
8333 TREE_TYPE (enu
) = enumtype
;
8335 /* The ISO C Standard mandates enumerators to have type int,
8336 even though the underlying type of an enum type is
8337 unspecified. However, GCC allows enumerators of any
8338 integer type as an extensions. build_enumerator()
8339 converts any enumerators that fit in an int to type int,
8340 to avoid promotions to unsigned types when comparing
8341 integers with enumerators that fit in the int range.
8342 When -pedantic is given, build_enumerator() would have
8343 already warned about those that don't fit. Here we
8344 convert the rest to the enumerator type. */
8345 if (TREE_TYPE (ini
) != integer_type_node
)
8346 ini
= convert (enumtype
, ini
);
8348 DECL_INITIAL (enu
) = ini
;
8349 TREE_PURPOSE (pair
) = DECL_NAME (enu
);
8350 TREE_VALUE (pair
) = ini
;
8353 TYPE_VALUES (enumtype
) = values
;
8356 /* Record the min/max values so that we can warn about bit-field
8357 enumerations that are too small for the values. */
8358 lt
= ggc_cleared_alloc
<struct lang_type
> ();
8359 lt
->enum_min
= minnode
;
8360 lt
->enum_max
= maxnode
;
8361 TYPE_LANG_SPECIFIC (enumtype
) = lt
;
8363 /* Fix up all variant types of this enum type. */
8364 for (tem
= TYPE_MAIN_VARIANT (enumtype
); tem
; tem
= TYPE_NEXT_VARIANT (tem
))
8366 if (tem
== enumtype
)
8368 TYPE_VALUES (tem
) = TYPE_VALUES (enumtype
);
8369 TYPE_MIN_VALUE (tem
) = TYPE_MIN_VALUE (enumtype
);
8370 TYPE_MAX_VALUE (tem
) = TYPE_MAX_VALUE (enumtype
);
8371 TYPE_SIZE (tem
) = TYPE_SIZE (enumtype
);
8372 TYPE_SIZE_UNIT (tem
) = TYPE_SIZE_UNIT (enumtype
);
8373 SET_TYPE_MODE (tem
, TYPE_MODE (enumtype
));
8374 TYPE_PRECISION (tem
) = TYPE_PRECISION (enumtype
);
8375 SET_TYPE_ALIGN (tem
, TYPE_ALIGN (enumtype
));
8376 TYPE_USER_ALIGN (tem
) = TYPE_USER_ALIGN (enumtype
);
8377 TYPE_UNSIGNED (tem
) = TYPE_UNSIGNED (enumtype
);
8378 TYPE_LANG_SPECIFIC (tem
) = TYPE_LANG_SPECIFIC (enumtype
);
8381 /* Finish debugging output for this type. */
8382 rest_of_type_compilation (enumtype
, toplevel
);
8384 /* If this enum is defined inside a struct, add it to
8387 && struct_parse_info
!= NULL
8388 && !in_sizeof
&& !in_typeof
&& !in_alignof
)
8389 struct_parse_info
->struct_types
.safe_push (enumtype
);
8394 /* Build and install a CONST_DECL for one value of the
8395 current enumeration type (one that was begun with start_enum).
8396 DECL_LOC is the location of the enumerator.
8397 LOC is the location of the '=' operator if any, DECL_LOC otherwise.
8398 Return a tree-list containing the CONST_DECL and its value.
8399 Assignment of sequential values by default is handled here. */
8402 build_enumerator (location_t decl_loc
, location_t loc
,
8403 struct c_enum_contents
*the_enum
, tree name
, tree value
)
8407 /* Validate and default VALUE. */
8409 if (value
!= NULL_TREE
)
8411 /* Don't issue more errors for error_mark_node (i.e. an
8412 undeclared identifier) - just ignore the value expression. */
8413 if (value
== error_mark_node
)
8415 else if (!INTEGRAL_TYPE_P (TREE_TYPE (value
)))
8417 error_at (loc
, "enumerator value for %qE is not an integer constant",
8423 if (TREE_CODE (value
) != INTEGER_CST
)
8425 value
= c_fully_fold (value
, false, NULL
);
8426 if (TREE_CODE (value
) == INTEGER_CST
)
8427 pedwarn (loc
, OPT_Wpedantic
,
8428 "enumerator value for %qE is not an integer "
8429 "constant expression", name
);
8431 if (TREE_CODE (value
) != INTEGER_CST
)
8433 error ("enumerator value for %qE is not an integer constant",
8439 value
= default_conversion (value
);
8440 constant_expression_warning (value
);
8445 /* Default based on previous value. */
8446 /* It should no longer be possible to have NON_LVALUE_EXPR
8448 if (value
== NULL_TREE
)
8450 value
= the_enum
->enum_next_value
;
8451 if (the_enum
->enum_overflow
)
8452 error_at (loc
, "overflow in enumeration values");
8454 /* Even though the underlying type of an enum is unspecified, the
8455 type of enumeration constants is explicitly defined as int
8456 (6.4.4.3/2 in the C99 Standard). GCC allows any integer type as
8458 else if (!int_fits_type_p (value
, integer_type_node
))
8459 pedwarn (loc
, OPT_Wpedantic
,
8460 "ISO C restricts enumerator values to range of %<int%>");
8462 /* The ISO C Standard mandates enumerators to have type int, even
8463 though the underlying type of an enum type is unspecified.
8464 However, GCC allows enumerators of any integer type as an
8465 extensions. Here we convert any enumerators that fit in an int
8466 to type int, to avoid promotions to unsigned types when comparing
8467 integers with enumerators that fit in the int range. When
8468 -pedantic is given, we would have already warned about those that
8469 don't fit. We have to do this here rather than in finish_enum
8470 because this value may be used to define more enumerators. */
8471 if (int_fits_type_p (value
, integer_type_node
))
8472 value
= convert (integer_type_node
, value
);
8474 /* Set basis for default for next value. */
8475 the_enum
->enum_next_value
8476 = build_binary_op (EXPR_LOC_OR_LOC (value
, input_location
),
8477 PLUS_EXPR
, value
, integer_one_node
, 0);
8478 the_enum
->enum_overflow
= tree_int_cst_lt (the_enum
->enum_next_value
, value
);
8480 /* Now create a declaration for the enum value name. */
8482 type
= TREE_TYPE (value
);
8483 type
= c_common_type_for_size (MAX (TYPE_PRECISION (type
),
8484 TYPE_PRECISION (integer_type_node
)),
8485 (TYPE_PRECISION (type
)
8486 >= TYPE_PRECISION (integer_type_node
)
8487 && TYPE_UNSIGNED (type
)));
8489 decl
= build_decl (decl_loc
, CONST_DECL
, name
, type
);
8490 DECL_INITIAL (decl
) = convert (type
, value
);
8493 return tree_cons (decl
, value
, NULL_TREE
);
8497 /* Create the FUNCTION_DECL for a function definition.
8498 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
8499 the declaration; they describe the function's name and the type it returns,
8500 but twisted together in a fashion that parallels the syntax of C.
8502 This function creates a binding context for the function body
8503 as well as setting up the FUNCTION_DECL in current_function_decl.
8505 Returns true on success. If the DECLARATOR is not suitable for a function
8506 (it defines a datum instead), we return false to report a parse error. */
8509 start_function (struct c_declspecs
*declspecs
, struct c_declarator
*declarator
,
8512 tree decl1
, old_decl
;
8513 tree restype
, resdecl
;
8516 current_function_returns_value
= 0; /* Assume, until we see it does. */
8517 current_function_returns_null
= 0;
8518 current_function_returns_abnormally
= 0;
8519 warn_about_return_type
= 0;
8520 c_switch_stack
= NULL
;
8522 /* Indicate no valid break/continue context by setting these variables
8523 to some non-null, non-label value. We'll notice and emit the proper
8524 error message in c_finish_bc_stmt. */
8525 c_break_label
= c_cont_label
= size_zero_node
;
8527 decl1
= grokdeclarator (declarator
, declspecs
, FUNCDEF
, true, NULL
,
8528 &attributes
, NULL
, NULL
, DEPRECATED_NORMAL
);
8529 invoke_plugin_callbacks (PLUGIN_START_PARSE_FUNCTION
, decl1
);
8531 /* If the declarator is not suitable for a function definition,
8532 cause a syntax error. */
8533 if (decl1
== NULL_TREE
8534 || TREE_CODE (decl1
) != FUNCTION_DECL
)
8537 loc
= DECL_SOURCE_LOCATION (decl1
);
8539 c_decl_attributes (&decl1
, attributes
, 0);
8541 if (DECL_DECLARED_INLINE_P (decl1
)
8542 && DECL_UNINLINABLE (decl1
)
8543 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1
)))
8544 warning_at (loc
, OPT_Wattributes
,
8545 "inline function %qD given attribute noinline",
8548 /* Handle gnu_inline attribute. */
8549 if (declspecs
->inline_p
8550 && !flag_gnu89_inline
8551 && TREE_CODE (decl1
) == FUNCTION_DECL
8552 && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl1
))
8553 || current_function_decl
))
8555 if (declspecs
->storage_class
!= csc_static
)
8556 DECL_EXTERNAL (decl1
) = !DECL_EXTERNAL (decl1
);
8559 announce_function (decl1
);
8561 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1
))))
8563 error_at (loc
, "return type is an incomplete type");
8564 /* Make it return void instead. */
8566 = build_function_type (void_type_node
,
8567 TYPE_ARG_TYPES (TREE_TYPE (decl1
)));
8570 if (warn_about_return_type
)
8571 warn_defaults_to (loc
, flag_isoc99
? OPT_Wimplicit_int
8572 : (warn_return_type
? OPT_Wreturn_type
8573 : OPT_Wimplicit_int
),
8574 "return type defaults to %<int%>");
8576 /* Make the init_value nonzero so pushdecl knows this is not tentative.
8577 error_mark_node is replaced below (in pop_scope) with the BLOCK. */
8578 DECL_INITIAL (decl1
) = error_mark_node
;
8580 /* A nested function is not global. */
8581 if (current_function_decl
!= NULL_TREE
)
8582 TREE_PUBLIC (decl1
) = 0;
8584 /* If this definition isn't a prototype and we had a prototype declaration
8585 before, copy the arg type info from that prototype. */
8586 old_decl
= lookup_name_in_scope (DECL_NAME (decl1
), current_scope
);
8587 if (old_decl
&& TREE_CODE (old_decl
) != FUNCTION_DECL
)
8588 old_decl
= NULL_TREE
;
8589 current_function_prototype_locus
= UNKNOWN_LOCATION
;
8590 current_function_prototype_built_in
= false;
8591 current_function_prototype_arg_types
= NULL_TREE
;
8592 if (!prototype_p (TREE_TYPE (decl1
)))
8594 if (old_decl
!= NULL_TREE
8595 && TREE_CODE (TREE_TYPE (old_decl
)) == FUNCTION_TYPE
8596 && comptypes (TREE_TYPE (TREE_TYPE (decl1
)),
8597 TREE_TYPE (TREE_TYPE (old_decl
))))
8599 if (stdarg_p (TREE_TYPE (old_decl
)))
8601 warning_at (loc
, 0, "%q+D defined as variadic function "
8602 "without prototype", decl1
);
8603 locate_old_decl (old_decl
);
8605 TREE_TYPE (decl1
) = composite_type (TREE_TYPE (old_decl
),
8607 current_function_prototype_locus
= DECL_SOURCE_LOCATION (old_decl
);
8608 current_function_prototype_built_in
8609 = C_DECL_BUILTIN_PROTOTYPE (old_decl
);
8610 current_function_prototype_arg_types
8611 = TYPE_ARG_TYPES (TREE_TYPE (decl1
));
8613 if (TREE_PUBLIC (decl1
))
8615 /* If there is an external prototype declaration of this
8616 function, record its location but do not copy information
8617 to this decl. This may be an invisible declaration
8618 (built-in or in a scope which has finished) or simply
8619 have more refined argument types than any declaration
8621 struct c_binding
*b
;
8622 for (b
= I_SYMBOL_BINDING (DECL_NAME (decl1
)); b
; b
= b
->shadowed
)
8623 if (B_IN_SCOPE (b
, external_scope
))
8627 tree ext_decl
, ext_type
;
8629 ext_type
= b
->u
.type
? b
->u
.type
: TREE_TYPE (ext_decl
);
8630 if (TREE_CODE (ext_type
) == FUNCTION_TYPE
8631 && comptypes (TREE_TYPE (TREE_TYPE (decl1
)),
8632 TREE_TYPE (ext_type
)))
8634 current_function_prototype_locus
8635 = DECL_SOURCE_LOCATION (ext_decl
);
8636 current_function_prototype_built_in
8637 = C_DECL_BUILTIN_PROTOTYPE (ext_decl
);
8638 current_function_prototype_arg_types
8639 = TYPE_ARG_TYPES (ext_type
);
8645 /* Optionally warn of old-fashioned def with no previous prototype. */
8646 if (warn_strict_prototypes
8647 && old_decl
!= error_mark_node
8648 && !prototype_p (TREE_TYPE (decl1
))
8649 && C_DECL_ISNT_PROTOTYPE (old_decl
))
8650 warning_at (loc
, OPT_Wstrict_prototypes
,
8651 "function declaration isn%'t a prototype");
8652 /* Optionally warn of any global def with no previous prototype. */
8653 else if (warn_missing_prototypes
8654 && old_decl
!= error_mark_node
8655 && TREE_PUBLIC (decl1
)
8656 && !MAIN_NAME_P (DECL_NAME (decl1
))
8657 && C_DECL_ISNT_PROTOTYPE (old_decl
)
8658 && !DECL_DECLARED_INLINE_P (decl1
))
8659 warning_at (loc
, OPT_Wmissing_prototypes
,
8660 "no previous prototype for %qD", decl1
);
8661 /* Optionally warn of any def with no previous prototype
8662 if the function has already been used. */
8663 else if (warn_missing_prototypes
8664 && old_decl
!= NULL_TREE
8665 && old_decl
!= error_mark_node
8666 && TREE_USED (old_decl
)
8667 && !prototype_p (TREE_TYPE (old_decl
)))
8668 warning_at (loc
, OPT_Wmissing_prototypes
,
8669 "%qD was used with no prototype before its definition", decl1
);
8670 /* Optionally warn of any global def with no previous declaration. */
8671 else if (warn_missing_declarations
8672 && TREE_PUBLIC (decl1
)
8673 && old_decl
== NULL_TREE
8674 && !MAIN_NAME_P (DECL_NAME (decl1
))
8675 && !DECL_DECLARED_INLINE_P (decl1
))
8676 warning_at (loc
, OPT_Wmissing_declarations
,
8677 "no previous declaration for %qD",
8679 /* Optionally warn of any def with no previous declaration
8680 if the function has already been used. */
8681 else if (warn_missing_declarations
8682 && old_decl
!= NULL_TREE
8683 && old_decl
!= error_mark_node
8684 && TREE_USED (old_decl
)
8685 && C_DECL_IMPLICIT (old_decl
))
8686 warning_at (loc
, OPT_Wmissing_declarations
,
8687 "%qD was used with no declaration before its definition", decl1
);
8689 /* This function exists in static storage.
8690 (This does not mean `static' in the C sense!) */
8691 TREE_STATIC (decl1
) = 1;
8693 /* This is the earliest point at which we might know the assembler
8694 name of the function. Thus, if it's set before this, die horribly. */
8695 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl1
));
8697 /* If #pragma weak was used, mark the decl weak now. */
8698 if (current_scope
== file_scope
)
8699 maybe_apply_pragma_weak (decl1
);
8701 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
8702 if (warn_main
&& MAIN_NAME_P (DECL_NAME (decl1
)))
8704 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1
)))
8705 != integer_type_node
)
8706 pedwarn (loc
, OPT_Wmain
, "return type of %qD is not %<int%>", decl1
);
8707 else if (TYPE_ATOMIC (TREE_TYPE (TREE_TYPE (decl1
))))
8708 pedwarn (loc
, OPT_Wmain
, "%<_Atomic%>-qualified return type of %qD",
8711 check_main_parameter_types (decl1
);
8713 if (!TREE_PUBLIC (decl1
))
8714 pedwarn (loc
, OPT_Wmain
,
8715 "%qD is normally a non-static function", decl1
);
8718 /* Record the decl so that the function name is defined.
8719 If we already have a decl for this name, and it is a FUNCTION_DECL,
8720 use the old decl. */
8722 current_function_decl
= pushdecl (decl1
);
8725 declare_parm_level ();
8727 restype
= TREE_TYPE (TREE_TYPE (current_function_decl
));
8728 resdecl
= build_decl (loc
, RESULT_DECL
, NULL_TREE
, restype
);
8729 DECL_ARTIFICIAL (resdecl
) = 1;
8730 DECL_IGNORED_P (resdecl
) = 1;
8731 DECL_RESULT (current_function_decl
) = resdecl
;
8733 start_fname_decls ();
8738 /* Subroutine of store_parm_decls which handles new-style function
8739 definitions (prototype format). The parms already have decls, so we
8740 need only record them as in effect and complain if any redundant
8741 old-style parm decls were written. */
8743 store_parm_decls_newstyle (tree fndecl
, const struct c_arg_info
*arg_info
)
8749 if (current_scope
->bindings
)
8751 error_at (DECL_SOURCE_LOCATION (fndecl
),
8752 "old-style parameter declarations in prototyped "
8753 "function definition");
8755 /* Get rid of the old-style declarations. */
8759 /* Don't issue this warning for nested functions, and don't issue this
8760 warning if we got here because ARG_INFO_TYPES was error_mark_node
8761 (this happens when a function definition has just an ellipsis in
8762 its parameter list). */
8763 else if (!in_system_header_at (input_location
)
8764 && !current_function_scope
8765 && arg_info
->types
!= error_mark_node
)
8766 warning_at (DECL_SOURCE_LOCATION (fndecl
), OPT_Wtraditional
,
8767 "traditional C rejects ISO C style function definitions");
8769 /* Now make all the parameter declarations visible in the function body.
8770 We can bypass most of the grunt work of pushdecl. */
8771 for (decl
= arg_info
->parms
; decl
; decl
= DECL_CHAIN (decl
))
8773 DECL_CONTEXT (decl
) = current_function_decl
;
8774 if (DECL_NAME (decl
))
8776 bind (DECL_NAME (decl
), decl
, current_scope
,
8777 /*invisible=*/false, /*nested=*/false,
8779 if (!TREE_USED (decl
))
8780 warn_if_shadowing (decl
);
8783 error_at (DECL_SOURCE_LOCATION (decl
), "parameter name omitted");
8786 /* Record the parameter list in the function declaration. */
8787 DECL_ARGUMENTS (fndecl
) = arg_info
->parms
;
8789 /* Now make all the ancillary declarations visible, likewise. */
8790 for (decl
= arg_info
->others
; decl
; decl
= DECL_CHAIN (decl
))
8792 DECL_CONTEXT (decl
) = current_function_decl
;
8793 if (DECL_NAME (decl
))
8794 bind (DECL_NAME (decl
), decl
, current_scope
,
8795 /*invisible=*/false,
8796 /*nested=*/(TREE_CODE (decl
) == FUNCTION_DECL
),
8800 /* And all the tag declarations. */
8801 FOR_EACH_VEC_SAFE_ELT_REVERSE (arg_info
->tags
, ix
, tag
)
8803 bind (tag
->id
, tag
->type
, current_scope
,
8804 /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION
);
8807 /* Subroutine of store_parm_decls which handles old-style function
8808 definitions (separate parameter list and declarations). */
8811 store_parm_decls_oldstyle (tree fndecl
, const struct c_arg_info
*arg_info
)
8813 struct c_binding
*b
;
8814 tree parm
, decl
, last
;
8815 tree parmids
= arg_info
->parms
;
8816 hash_set
<tree
> seen_args
;
8818 if (!in_system_header_at (input_location
))
8819 warning_at (DECL_SOURCE_LOCATION (fndecl
),
8820 OPT_Wold_style_definition
, "old-style function definition");
8822 /* Match each formal parameter name with its declaration. Save each
8823 decl in the appropriate TREE_PURPOSE slot of the parmids chain. */
8824 for (parm
= parmids
; parm
; parm
= TREE_CHAIN (parm
))
8826 if (TREE_VALUE (parm
) == NULL_TREE
)
8828 error_at (DECL_SOURCE_LOCATION (fndecl
),
8829 "parameter name missing from parameter list");
8830 TREE_PURPOSE (parm
) = NULL_TREE
;
8834 b
= I_SYMBOL_BINDING (TREE_VALUE (parm
));
8835 if (b
&& B_IN_CURRENT_SCOPE (b
))
8838 /* Skip erroneous parameters. */
8839 if (decl
== error_mark_node
)
8841 /* If we got something other than a PARM_DECL it is an error. */
8842 if (TREE_CODE (decl
) != PARM_DECL
)
8844 error_at (DECL_SOURCE_LOCATION (decl
),
8845 "%qD declared as a non-parameter", decl
);
8848 /* If the declaration is already marked, we have a duplicate
8849 name. Complain and ignore the duplicate. */
8850 else if (seen_args
.contains (decl
))
8852 error_at (DECL_SOURCE_LOCATION (decl
),
8853 "multiple parameters named %qD", decl
);
8854 TREE_PURPOSE (parm
) = NULL_TREE
;
8857 /* If the declaration says "void", complain and turn it into
8859 else if (VOID_TYPE_P (TREE_TYPE (decl
)))
8861 error_at (DECL_SOURCE_LOCATION (decl
),
8862 "parameter %qD declared with void type", decl
);
8863 TREE_TYPE (decl
) = integer_type_node
;
8864 DECL_ARG_TYPE (decl
) = integer_type_node
;
8865 layout_decl (decl
, 0);
8867 warn_if_shadowing (decl
);
8869 /* If no declaration found, default to int. */
8872 /* FIXME diagnostics: This should be the location of the argument,
8873 not the FNDECL. E.g., for an old-style declaration
8875 int f10(v) { blah; }
8877 We should use the location of the V, not the F10.
8878 Unfortunately, the V is an IDENTIFIER_NODE which has no
8879 location. In the future we need locations for c_arg_info
8882 See gcc.dg/Wshadow-3.c for an example of this problem. */
8883 decl
= build_decl (DECL_SOURCE_LOCATION (fndecl
),
8884 PARM_DECL
, TREE_VALUE (parm
), integer_type_node
);
8885 DECL_ARG_TYPE (decl
) = TREE_TYPE (decl
);
8887 warn_if_shadowing (decl
);
8890 pedwarn (DECL_SOURCE_LOCATION (decl
),
8891 OPT_Wimplicit_int
, "type of %qD defaults to %<int%>",
8894 warning_at (DECL_SOURCE_LOCATION (decl
),
8895 OPT_Wmissing_parameter_type
,
8896 "type of %qD defaults to %<int%>", decl
);
8899 TREE_PURPOSE (parm
) = decl
;
8900 seen_args
.add (decl
);
8903 /* Now examine the parms chain for incomplete declarations
8904 and declarations with no corresponding names. */
8906 for (b
= current_scope
->bindings
; b
; b
= b
->prev
)
8909 if (TREE_CODE (parm
) != PARM_DECL
)
8912 if (TREE_TYPE (parm
) != error_mark_node
8913 && !COMPLETE_TYPE_P (TREE_TYPE (parm
)))
8915 error_at (DECL_SOURCE_LOCATION (parm
),
8916 "parameter %qD has incomplete type", parm
);
8917 TREE_TYPE (parm
) = error_mark_node
;
8920 if (!seen_args
.contains (parm
))
8922 error_at (DECL_SOURCE_LOCATION (parm
),
8923 "declaration for parameter %qD but no such parameter",
8926 /* Pretend the parameter was not missing.
8927 This gets us to a standard state and minimizes
8928 further error messages. */
8929 parmids
= chainon (parmids
, tree_cons (parm
, 0, 0));
8933 /* Chain the declarations together in the order of the list of
8934 names. Store that chain in the function decl, replacing the
8935 list of names. Update the current scope to match. */
8936 DECL_ARGUMENTS (fndecl
) = NULL_TREE
;
8938 for (parm
= parmids
; parm
; parm
= TREE_CHAIN (parm
))
8939 if (TREE_PURPOSE (parm
))
8941 if (parm
&& TREE_PURPOSE (parm
))
8943 last
= TREE_PURPOSE (parm
);
8944 DECL_ARGUMENTS (fndecl
) = last
;
8946 for (parm
= TREE_CHAIN (parm
); parm
; parm
= TREE_CHAIN (parm
))
8947 if (TREE_PURPOSE (parm
))
8949 DECL_CHAIN (last
) = TREE_PURPOSE (parm
);
8950 last
= TREE_PURPOSE (parm
);
8952 DECL_CHAIN (last
) = NULL_TREE
;
8955 /* If there was a previous prototype,
8956 set the DECL_ARG_TYPE of each argument according to
8957 the type previously specified, and report any mismatches. */
8959 if (current_function_prototype_arg_types
)
8962 for (parm
= DECL_ARGUMENTS (fndecl
),
8963 type
= current_function_prototype_arg_types
;
8964 parm
|| (type
!= NULL_TREE
8965 && TREE_VALUE (type
) != error_mark_node
8966 && TYPE_MAIN_VARIANT (TREE_VALUE (type
)) != void_type_node
);
8967 parm
= DECL_CHAIN (parm
), type
= TREE_CHAIN (type
))
8969 if (parm
== NULL_TREE
8970 || type
== NULL_TREE
8971 || (TREE_VALUE (type
) != error_mark_node
8972 && TYPE_MAIN_VARIANT (TREE_VALUE (type
)) == void_type_node
))
8974 if (current_function_prototype_built_in
)
8975 warning_at (DECL_SOURCE_LOCATION (fndecl
),
8976 0, "number of arguments doesn%'t match "
8977 "built-in prototype");
8980 /* FIXME diagnostics: This should be the location of
8981 FNDECL, but there is bug when a prototype is
8982 declared inside function context, but defined
8983 outside of it (e.g., gcc.dg/pr15698-2.c). In
8984 which case FNDECL gets the location of the
8985 prototype, not the definition. */
8986 error_at (input_location
,
8987 "number of arguments doesn%'t match prototype");
8989 error_at (current_function_prototype_locus
,
8990 "prototype declaration");
8994 /* Type for passing arg must be consistent with that
8995 declared for the arg. ISO C says we take the unqualified
8996 type for parameters declared with qualified type. */
8997 if (TREE_TYPE (parm
) != error_mark_node
8998 && TREE_VALUE (type
) != error_mark_node
8999 && ((TYPE_ATOMIC (DECL_ARG_TYPE (parm
))
9000 != TYPE_ATOMIC (TREE_VALUE (type
)))
9001 || !comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm
)),
9002 TYPE_MAIN_VARIANT (TREE_VALUE (type
)))))
9004 if ((TYPE_ATOMIC (DECL_ARG_TYPE (parm
))
9005 == TYPE_ATOMIC (TREE_VALUE (type
)))
9006 && (TYPE_MAIN_VARIANT (TREE_TYPE (parm
))
9007 == TYPE_MAIN_VARIANT (TREE_VALUE (type
))))
9009 /* Adjust argument to match prototype. E.g. a previous
9010 `int foo(float);' prototype causes
9011 `int foo(x) float x; {...}' to be treated like
9012 `int foo(float x) {...}'. This is particularly
9013 useful for argument types like uid_t. */
9014 DECL_ARG_TYPE (parm
) = TREE_TYPE (parm
);
9016 if (targetm
.calls
.promote_prototypes (TREE_TYPE (current_function_decl
))
9017 && INTEGRAL_TYPE_P (TREE_TYPE (parm
))
9018 && (TYPE_PRECISION (TREE_TYPE (parm
))
9019 < TYPE_PRECISION (integer_type_node
)))
9020 DECL_ARG_TYPE (parm
)
9021 = c_type_promotes_to (TREE_TYPE (parm
));
9023 /* ??? Is it possible to get here with a
9024 built-in prototype or will it always have
9025 been diagnosed as conflicting with an
9026 old-style definition and discarded? */
9027 if (current_function_prototype_built_in
)
9028 warning_at (DECL_SOURCE_LOCATION (parm
),
9029 OPT_Wpedantic
, "promoted argument %qD "
9030 "doesn%'t match built-in prototype", parm
);
9033 pedwarn (DECL_SOURCE_LOCATION (parm
),
9034 OPT_Wpedantic
, "promoted argument %qD "
9035 "doesn%'t match prototype", parm
);
9036 pedwarn (current_function_prototype_locus
, OPT_Wpedantic
,
9037 "prototype declaration");
9042 if (current_function_prototype_built_in
)
9043 warning_at (DECL_SOURCE_LOCATION (parm
),
9044 0, "argument %qD doesn%'t match "
9045 "built-in prototype", parm
);
9048 error_at (DECL_SOURCE_LOCATION (parm
),
9049 "argument %qD doesn%'t match prototype", parm
);
9050 error_at (current_function_prototype_locus
,
9051 "prototype declaration");
9056 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl
)) = NULL_TREE
;
9059 /* Otherwise, create a prototype that would match. */
9063 tree actual
= NULL_TREE
, last
= NULL_TREE
, type
;
9065 for (parm
= DECL_ARGUMENTS (fndecl
); parm
; parm
= DECL_CHAIN (parm
))
9067 type
= tree_cons (NULL_TREE
, DECL_ARG_TYPE (parm
), NULL_TREE
);
9069 TREE_CHAIN (last
) = type
;
9074 type
= tree_cons (NULL_TREE
, void_type_node
, NULL_TREE
);
9076 TREE_CHAIN (last
) = type
;
9080 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
9081 of the type of this function, but we need to avoid having this
9082 affect the types of other similarly-typed functions, so we must
9083 first force the generation of an identical (but separate) type
9084 node for the relevant function type. The new node we create
9085 will be a variant of the main variant of the original function
9088 TREE_TYPE (fndecl
) = build_variant_type_copy (TREE_TYPE (fndecl
));
9090 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl
)) = actual
;
9094 /* Store parameter declarations passed in ARG_INFO into the current
9095 function declaration. */
9098 store_parm_decls_from (struct c_arg_info
*arg_info
)
9100 current_function_arg_info
= arg_info
;
9101 store_parm_decls ();
9104 /* Called by walk_tree to look for and update context-less labels. */
9107 set_labels_context_r (tree
*tp
, int *walk_subtrees
, void *data
)
9109 if (TREE_CODE (*tp
) == LABEL_EXPR
9110 && DECL_CONTEXT (LABEL_EXPR_LABEL (*tp
)) == NULL_TREE
)
9112 DECL_CONTEXT (LABEL_EXPR_LABEL (*tp
)) = static_cast<tree
>(data
);
9119 /* Store the parameter declarations into the current function declaration.
9120 This is called after parsing the parameter declarations, before
9121 digesting the body of the function.
9123 For an old-style definition, construct a prototype out of the old-style
9124 parameter declarations and inject it into the function's type. */
9127 store_parm_decls (void)
9129 tree fndecl
= current_function_decl
;
9132 /* The argument information block for FNDECL. */
9133 struct c_arg_info
*arg_info
= current_function_arg_info
;
9134 current_function_arg_info
= 0;
9136 /* True if this definition is written with a prototype. Note:
9137 despite C99 6.7.5.3p14, we can *not* treat an empty argument
9138 list in a function definition as equivalent to (void) -- an
9139 empty argument list specifies the function has no parameters,
9140 but only (void) sets up a prototype for future calls. */
9141 proto
= arg_info
->types
!= 0;
9144 store_parm_decls_newstyle (fndecl
, arg_info
);
9146 store_parm_decls_oldstyle (fndecl
, arg_info
);
9148 /* The next call to push_scope will be a function body. */
9150 next_is_function_body
= true;
9152 /* Write a record describing this function definition to the prototypes
9153 file (if requested). */
9155 gen_aux_info_record (fndecl
, 1, 0, proto
);
9157 /* Initialize the RTL code for the function. */
9158 allocate_struct_function (fndecl
, false);
9160 if (warn_unused_local_typedefs
)
9161 cfun
->language
= ggc_cleared_alloc
<language_function
> ();
9163 /* Begin the statement tree for this function. */
9164 DECL_SAVED_TREE (fndecl
) = push_stmt_list ();
9166 /* ??? Insert the contents of the pending sizes list into the function
9167 to be evaluated. The only reason left to have this is
9168 void foo(int n, int array[n++])
9169 because we throw away the array type in favor of a pointer type, and
9170 thus won't naturally see the SAVE_EXPR containing the increment. All
9171 other pending sizes would be handled by gimplify_parameters. */
9172 if (arg_info
->pending_sizes
)
9174 /* In very special circumstances, e.g. for code like
9176 void f (int a[i += 2]) {}
9177 we need to execute the atomic assignment on function entry.
9178 But in this case, it is not just a straight store, it has the
9179 op= form, which means that build_atomic_assign has generated
9180 gotos, labels, etc. Because at that time the function decl
9181 for F has not been created yet, those labels do not have any
9182 function context. But we have the fndecl now, so update the
9183 labels accordingly. gimplify_expr would crash otherwise. */
9184 walk_tree_without_duplicates (&arg_info
->pending_sizes
,
9185 set_labels_context_r
, fndecl
);
9186 add_stmt (arg_info
->pending_sizes
);
9190 /* Store PARM_DECLs in PARMS into scope temporarily. Used for
9191 c_finish_omp_declare_simd for function prototypes. No diagnostics
9195 temp_store_parm_decls (tree fndecl
, tree parms
)
9198 for (tree p
= parms
; p
; p
= DECL_CHAIN (p
))
9200 DECL_CONTEXT (p
) = fndecl
;
9202 bind (DECL_NAME (p
), p
, current_scope
,
9203 /*invisible=*/false, /*nested=*/false,
9208 /* Undo what temp_store_parm_decls did. */
9211 temp_pop_parm_decls (void)
9213 /* Clear all bindings in this temporary scope, so that
9214 pop_scope doesn't create a BLOCK. */
9215 struct c_binding
*b
= current_scope
->bindings
;
9216 current_scope
->bindings
= NULL
;
9217 for (; b
; b
= free_binding_and_advance (b
))
9219 gcc_assert (TREE_CODE (b
->decl
) == PARM_DECL
9220 || b
->decl
== error_mark_node
);
9221 gcc_assert (I_SYMBOL_BINDING (b
->id
) == b
);
9222 I_SYMBOL_BINDING (b
->id
) = b
->shadowed
;
9223 if (b
->shadowed
&& b
->shadowed
->u
.type
)
9224 TREE_TYPE (b
->shadowed
->decl
) = b
->shadowed
->u
.type
;
9230 /* Finish up a function declaration and compile that function
9231 all the way to assembler language output. Then free the storage
9232 for the function definition.
9234 This is called after parsing the body of the function definition. */
9237 finish_function (void)
9239 tree fndecl
= current_function_decl
;
9241 if (c_dialect_objc ())
9242 objc_finish_function ();
9244 if (TREE_CODE (fndecl
) == FUNCTION_DECL
9245 && targetm
.calls
.promote_prototypes (TREE_TYPE (fndecl
)))
9247 tree args
= DECL_ARGUMENTS (fndecl
);
9248 for (; args
; args
= DECL_CHAIN (args
))
9250 tree type
= TREE_TYPE (args
);
9251 if (INTEGRAL_TYPE_P (type
)
9252 && TYPE_PRECISION (type
) < TYPE_PRECISION (integer_type_node
))
9253 DECL_ARG_TYPE (args
) = c_type_promotes_to (type
);
9257 if (DECL_INITIAL (fndecl
) && DECL_INITIAL (fndecl
) != error_mark_node
)
9258 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl
)) = fndecl
;
9260 /* Must mark the RESULT_DECL as being in this function. */
9262 if (DECL_RESULT (fndecl
) && DECL_RESULT (fndecl
) != error_mark_node
)
9263 DECL_CONTEXT (DECL_RESULT (fndecl
)) = fndecl
;
9265 if (MAIN_NAME_P (DECL_NAME (fndecl
)) && flag_hosted
9266 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl
)))
9267 == integer_type_node
&& flag_isoc99
)
9269 /* Hack. We don't want the middle-end to warn that this return
9270 is unreachable, so we mark its location as special. Using
9271 UNKNOWN_LOCATION has the problem that it gets clobbered in
9272 annotate_one_with_locus. A cleaner solution might be to
9273 ensure ! should_carry_locus_p (stmt), but that needs a flag.
9275 c_finish_return (BUILTINS_LOCATION
, integer_zero_node
, NULL_TREE
);
9278 /* Tie off the statement tree for this function. */
9279 DECL_SAVED_TREE (fndecl
) = pop_stmt_list (DECL_SAVED_TREE (fndecl
));
9281 /* If the function has _Cilk_spawn in front of a function call inside it
9282 i.e. it is a spawning function, then add the appropriate Cilk plus
9283 functions inside. */
9284 if (fn_contains_cilk_spawn_p (cfun
))
9285 cfun
->cilk_frame_decl
= insert_cilk_frame (fndecl
);
9287 finish_fname_decls ();
9289 /* Complain if there's just no return statement. */
9290 if (warn_return_type
9291 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl
))) != VOID_TYPE
9292 && !current_function_returns_value
&& !current_function_returns_null
9293 /* Don't complain if we are no-return. */
9294 && !current_function_returns_abnormally
9295 /* Don't complain if we are declared noreturn. */
9296 && !TREE_THIS_VOLATILE (fndecl
)
9297 /* Don't warn for main(). */
9298 && !MAIN_NAME_P (DECL_NAME (fndecl
))
9299 /* Or if they didn't actually specify a return type. */
9300 && !C_FUNCTION_IMPLICIT_INT (fndecl
)
9301 /* Normally, with -Wreturn-type, flow will complain, but we might
9302 optimize out static functions. */
9303 && !TREE_PUBLIC (fndecl
))
9305 warning (OPT_Wreturn_type
,
9306 "no return statement in function returning non-void");
9307 TREE_NO_WARNING (fndecl
) = 1;
9310 /* Complain about parameters that are only set, but never otherwise used. */
9311 if (warn_unused_but_set_parameter
)
9315 for (decl
= DECL_ARGUMENTS (fndecl
);
9317 decl
= DECL_CHAIN (decl
))
9318 if (TREE_USED (decl
)
9319 && TREE_CODE (decl
) == PARM_DECL
9320 && !DECL_READ_P (decl
)
9322 && !DECL_ARTIFICIAL (decl
)
9323 && !TREE_NO_WARNING (decl
))
9324 warning_at (DECL_SOURCE_LOCATION (decl
),
9325 OPT_Wunused_but_set_parameter
,
9326 "parameter %qD set but not used", decl
);
9329 /* Complain about locally defined typedefs that are not used in this
9331 maybe_warn_unused_local_typedefs ();
9333 /* Possibly warn about unused parameters. */
9334 if (warn_unused_parameter
)
9335 do_warn_unused_parameter (fndecl
);
9337 /* Store the end of the function, so that we get good line number
9338 info for the epilogue. */
9339 cfun
->function_end_locus
= input_location
;
9341 /* Finalize the ELF visibility for the function. */
9342 c_determine_visibility (fndecl
);
9344 /* For GNU C extern inline functions disregard inline limits. */
9345 if (DECL_EXTERNAL (fndecl
)
9346 && DECL_DECLARED_INLINE_P (fndecl
)
9347 && (flag_gnu89_inline
9348 || lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (fndecl
))))
9349 DECL_DISREGARD_INLINE_LIMITS (fndecl
) = 1;
9351 /* Genericize before inlining. Delay genericizing nested functions
9352 until their parent function is genericized. Since finalizing
9353 requires GENERIC, delay that as well. */
9355 if (DECL_INITIAL (fndecl
) && DECL_INITIAL (fndecl
) != error_mark_node
9356 && !undef_nested_function
)
9358 if (!decl_function_context (fndecl
))
9360 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE
, fndecl
);
9361 c_genericize (fndecl
);
9363 /* ??? Objc emits functions after finalizing the compilation unit.
9364 This should be cleaned up later and this conditional removed. */
9365 if (symtab
->global_info_ready
)
9367 cgraph_node::add_new_function (fndecl
, false);
9370 cgraph_node::finalize_function (fndecl
, false);
9374 /* Register this function with cgraph just far enough to get it
9375 added to our parent's nested function list. Handy, since the
9376 C front end doesn't have such a list. */
9377 (void) cgraph_node::get_create (fndecl
);
9381 if (!decl_function_context (fndecl
))
9382 undef_nested_function
= false;
9384 if (cfun
->language
!= NULL
)
9386 ggc_free (cfun
->language
);
9387 cfun
->language
= NULL
;
9390 /* We're leaving the context of this function, so zap cfun.
9391 It's still in DECL_STRUCT_FUNCTION, and we'll restore it in
9392 tree_rest_of_compilation. */
9394 invoke_plugin_callbacks (PLUGIN_FINISH_PARSE_FUNCTION
, current_function_decl
);
9395 current_function_decl
= NULL
;
9398 /* Check the declarations given in a for-loop for satisfying the C99
9399 constraints. If exactly one such decl is found, return it. LOC is
9400 the location of the opening parenthesis of the for loop. The last
9401 parameter allows you to control the "for loop initial declarations
9402 are only allowed in C99 mode". Normally, you should pass
9403 flag_isoc99 as that parameter. But in some cases (Objective-C
9404 foreach loop, for example) we want to run the checks in this
9405 function even if not in C99 mode, so we allow the caller to turn
9406 off the error about not being in C99 mode.
9410 check_for_loop_decls (location_t loc
, bool turn_off_iso_c99_error
)
9412 struct c_binding
*b
;
9413 tree one_decl
= NULL_TREE
;
9416 if (!turn_off_iso_c99_error
)
9418 static bool hint
= true;
9419 /* If we get here, declarations have been used in a for loop without
9420 the C99 for loop scope. This doesn't make much sense, so don't
9422 error_at (loc
, "%<for%> loop initial declarations "
9423 "are only allowed in C99 or C11 mode");
9427 "use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 "
9428 "to compile your code");
9433 /* C99 subclause 6.8.5 paragraph 3:
9435 [#3] The declaration part of a for statement shall only
9436 declare identifiers for objects having storage class auto or
9439 It isn't clear whether, in this sentence, "identifiers" binds to
9440 "shall only declare" or to "objects" - that is, whether all identifiers
9441 declared must be identifiers for objects, or whether the restriction
9442 only applies to those that are. (A question on this in comp.std.c
9443 in November 2000 received no answer.) We implement the strictest
9444 interpretation, to avoid creating an extension which later causes
9447 for (b
= current_scope
->bindings
; b
; b
= b
->prev
)
9450 tree decl
= b
->decl
;
9455 switch (TREE_CODE (decl
))
9459 location_t decl_loc
= DECL_SOURCE_LOCATION (decl
);
9460 if (TREE_STATIC (decl
))
9462 "declaration of static variable %qD in %<for%> loop "
9463 "initial declaration", decl
);
9464 else if (DECL_EXTERNAL (decl
))
9466 "declaration of %<extern%> variable %qD in %<for%> loop "
9467 "initial declaration", decl
);
9473 "%<struct %E%> declared in %<for%> loop initial "
9478 "%<union %E%> declared in %<for%> loop initial declaration",
9482 error_at (loc
, "%<enum %E%> declared in %<for%> loop "
9483 "initial declaration", id
);
9486 error_at (loc
, "declaration of non-variable "
9487 "%qD in %<for%> loop initial declaration", decl
);
9494 return n_decls
== 1 ? one_decl
: NULL_TREE
;
9497 /* Save and reinitialize the variables
9498 used during compilation of a C function. */
9501 c_push_function_context (void)
9503 struct language_function
*p
= cfun
->language
;
9504 /* cfun->language might have been already allocated by the use of
9505 -Wunused-local-typedefs. In that case, just re-use it. */
9507 cfun
->language
= p
= ggc_cleared_alloc
<language_function
> ();
9509 p
->base
.x_stmt_tree
= c_stmt_tree
;
9510 c_stmt_tree
.x_cur_stmt_list
= vec_safe_copy (c_stmt_tree
.x_cur_stmt_list
);
9511 p
->x_break_label
= c_break_label
;
9512 p
->x_cont_label
= c_cont_label
;
9513 p
->x_switch_stack
= c_switch_stack
;
9514 p
->arg_info
= current_function_arg_info
;
9515 p
->returns_value
= current_function_returns_value
;
9516 p
->returns_null
= current_function_returns_null
;
9517 p
->returns_abnormally
= current_function_returns_abnormally
;
9518 p
->warn_about_return_type
= warn_about_return_type
;
9520 push_function_context ();
9523 /* Restore the variables used during compilation of a C function. */
9526 c_pop_function_context (void)
9528 struct language_function
*p
;
9530 pop_function_context ();
9533 /* When -Wunused-local-typedefs is in effect, cfun->languages is
9534 used to store data throughout the life time of the current cfun,
9535 So don't deallocate it. */
9536 if (!warn_unused_local_typedefs
)
9537 cfun
->language
= NULL
;
9539 if (DECL_STRUCT_FUNCTION (current_function_decl
) == 0
9540 && DECL_SAVED_TREE (current_function_decl
) == NULL_TREE
)
9542 /* Stop pointing to the local nodes about to be freed. */
9543 /* But DECL_INITIAL must remain nonzero so we know this
9544 was an actual function definition. */
9545 DECL_INITIAL (current_function_decl
) = error_mark_node
;
9546 DECL_ARGUMENTS (current_function_decl
) = NULL_TREE
;
9549 c_stmt_tree
= p
->base
.x_stmt_tree
;
9550 p
->base
.x_stmt_tree
.x_cur_stmt_list
= NULL
;
9551 c_break_label
= p
->x_break_label
;
9552 c_cont_label
= p
->x_cont_label
;
9553 c_switch_stack
= p
->x_switch_stack
;
9554 current_function_arg_info
= p
->arg_info
;
9555 current_function_returns_value
= p
->returns_value
;
9556 current_function_returns_null
= p
->returns_null
;
9557 current_function_returns_abnormally
= p
->returns_abnormally
;
9558 warn_about_return_type
= p
->warn_about_return_type
;
9561 /* The functions below are required for functionality of doing
9562 function at once processing in the C front end. Currently these
9563 functions are not called from anywhere in the C front end, but as
9564 these changes continue, that will change. */
9566 /* Returns the stmt_tree (if any) to which statements are currently
9567 being added. If there is no active statement-tree, NULL is
9571 current_stmt_tree (void)
9573 return &c_stmt_tree
;
9576 /* Return the global value of T as a symbol. */
9579 identifier_global_value (tree t
)
9581 struct c_binding
*b
;
9583 for (b
= I_SYMBOL_BINDING (t
); b
; b
= b
->shadowed
)
9584 if (B_IN_FILE_SCOPE (b
) || B_IN_EXTERNAL_SCOPE (b
))
9590 /* In C, the only C-linkage public declaration is at file scope. */
9593 c_linkage_bindings (tree name
)
9595 return identifier_global_value (name
);
9598 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
9599 otherwise the name is found in ridpointers from RID_INDEX. */
9602 record_builtin_type (enum rid rid_index
, const char *name
, tree type
)
9606 id
= ridpointers
[(int) rid_index
];
9608 id
= get_identifier (name
);
9609 decl
= build_decl (UNKNOWN_LOCATION
, TYPE_DECL
, id
, type
);
9611 if (debug_hooks
->type_decl
)
9612 debug_hooks
->type_decl (decl
, false);
9615 /* Build the void_list_node (void_type_node having been created). */
9617 build_void_list_node (void)
9619 tree t
= build_tree_list (NULL_TREE
, void_type_node
);
9623 /* Return a c_parm structure with the given SPECS, ATTRS and DECLARATOR. */
9626 build_c_parm (struct c_declspecs
*specs
, tree attrs
,
9627 struct c_declarator
*declarator
)
9629 struct c_parm
*ret
= XOBNEW (&parser_obstack
, struct c_parm
);
9632 ret
->declarator
= declarator
;
9636 /* Return a declarator with nested attributes. TARGET is the inner
9637 declarator to which these attributes apply. ATTRS are the
9640 struct c_declarator
*
9641 build_attrs_declarator (tree attrs
, struct c_declarator
*target
)
9643 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
9644 ret
->kind
= cdk_attrs
;
9645 ret
->declarator
= target
;
9646 ret
->u
.attrs
= attrs
;
9650 /* Return a declarator for a function with arguments specified by ARGS
9651 and return type specified by TARGET. */
9653 struct c_declarator
*
9654 build_function_declarator (struct c_arg_info
*args
,
9655 struct c_declarator
*target
)
9657 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
9658 ret
->kind
= cdk_function
;
9659 ret
->declarator
= target
;
9660 ret
->u
.arg_info
= args
;
9664 /* Return a declarator for the identifier IDENT (which may be
9665 NULL_TREE for an abstract declarator). */
9667 struct c_declarator
*
9668 build_id_declarator (tree ident
)
9670 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
9672 ret
->declarator
= 0;
9674 /* Default value - may get reset to a more precise location. */
9675 ret
->id_loc
= input_location
;
9679 /* Return something to represent absolute declarators containing a *.
9680 TARGET is the absolute declarator that the * contains.
9681 TYPE_QUALS_ATTRS is a structure for type qualifiers and attributes
9682 to apply to the pointer type. */
9684 struct c_declarator
*
9685 make_pointer_declarator (struct c_declspecs
*type_quals_attrs
,
9686 struct c_declarator
*target
)
9690 struct c_declarator
*itarget
= target
;
9691 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
9692 if (type_quals_attrs
)
9694 attrs
= type_quals_attrs
->attrs
;
9695 quals
= quals_from_declspecs (type_quals_attrs
);
9696 if (attrs
!= NULL_TREE
)
9697 itarget
= build_attrs_declarator (attrs
, target
);
9699 ret
->kind
= cdk_pointer
;
9700 ret
->declarator
= itarget
;
9701 ret
->u
.pointer_quals
= quals
;
9705 /* Return a pointer to a structure for an empty list of declaration
9708 struct c_declspecs
*
9709 build_null_declspecs (void)
9711 struct c_declspecs
*ret
= XOBNEW (&parser_obstack
, struct c_declspecs
);
9712 memset (ret
, 0, sizeof *ret
);
9713 ret
->align_log
= -1;
9714 ret
->typespec_word
= cts_none
;
9715 ret
->storage_class
= csc_none
;
9716 ret
->expr_const_operands
= true;
9717 ret
->typespec_kind
= ctsk_none
;
9718 ret
->address_space
= ADDR_SPACE_GENERIC
;
9722 /* Add the address space ADDRSPACE to the declaration specifiers
9723 SPECS, returning SPECS. */
9725 struct c_declspecs
*
9726 declspecs_add_addrspace (source_location location
,
9727 struct c_declspecs
*specs
, addr_space_t as
)
9729 specs
->non_sc_seen_p
= true;
9730 specs
->declspecs_seen_p
= true;
9732 if (!ADDR_SPACE_GENERIC_P (specs
->address_space
)
9733 && specs
->address_space
!= as
)
9734 error ("incompatible address space qualifiers %qs and %qs",
9735 c_addr_space_name (as
),
9736 c_addr_space_name (specs
->address_space
));
9739 specs
->address_space
= as
;
9740 specs
->locations
[cdw_address_space
] = location
;
9745 /* Add the type qualifier QUAL to the declaration specifiers SPECS,
9748 struct c_declspecs
*
9749 declspecs_add_qual (source_location loc
,
9750 struct c_declspecs
*specs
, tree qual
)
9754 specs
->non_sc_seen_p
= true;
9755 specs
->declspecs_seen_p
= true;
9756 gcc_assert (TREE_CODE (qual
) == IDENTIFIER_NODE
9757 && C_IS_RESERVED_WORD (qual
));
9758 i
= C_RID_CODE (qual
);
9759 location_t prev_loc
= UNKNOWN_LOCATION
;
9763 dupe
= specs
->const_p
;
9764 specs
->const_p
= true;
9765 prev_loc
= specs
->locations
[cdw_const
];
9766 specs
->locations
[cdw_const
] = loc
;
9769 dupe
= specs
->volatile_p
;
9770 specs
->volatile_p
= true;
9771 prev_loc
= specs
->locations
[cdw_volatile
];
9772 specs
->locations
[cdw_volatile
] = loc
;
9775 dupe
= specs
->restrict_p
;
9776 specs
->restrict_p
= true;
9777 prev_loc
= specs
->locations
[cdw_restrict
];
9778 specs
->locations
[cdw_restrict
] = loc
;
9781 dupe
= specs
->atomic_p
;
9782 specs
->atomic_p
= true;
9783 prev_loc
= specs
->locations
[cdw_atomic
];
9784 specs
->locations
[cdw_atomic
] = loc
;
9791 bool warned
= pedwarn_c90 (loc
, OPT_Wpedantic
,
9792 "duplicate %qE declaration specifier", qual
);
9794 && warn_duplicate_decl_specifier
9795 && prev_loc
>= RESERVED_LOCATION_COUNT
9796 && !from_macro_expansion_at (prev_loc
)
9797 && !from_macro_expansion_at (loc
))
9798 warning_at (loc
, OPT_Wduplicate_decl_specifier
,
9799 "duplicate %qE declaration specifier", qual
);
9804 /* Add the type specifier TYPE to the declaration specifiers SPECS,
9807 struct c_declspecs
*
9808 declspecs_add_type (location_t loc
, struct c_declspecs
*specs
,
9809 struct c_typespec spec
)
9811 tree type
= spec
.spec
;
9812 specs
->non_sc_seen_p
= true;
9813 specs
->declspecs_seen_p
= true;
9814 specs
->typespec_kind
= spec
.kind
;
9815 if (TREE_DEPRECATED (type
))
9816 specs
->deprecated_p
= true;
9818 /* Handle type specifier keywords. */
9819 if (TREE_CODE (type
) == IDENTIFIER_NODE
9820 && C_IS_RESERVED_WORD (type
)
9821 && C_RID_CODE (type
) != RID_CXX_COMPAT_WARN
)
9823 enum rid i
= C_RID_CODE (type
);
9826 error_at (loc
, "two or more data types in declaration specifiers");
9829 if ((int) i
<= (int) RID_LAST_MODIFIER
)
9831 /* "long", "short", "signed", "unsigned", "_Complex" or "_Sat". */
9836 if (specs
->long_long_p
)
9838 error_at (loc
, "%<long long long%> is too long for GCC");
9843 if (specs
->typespec_word
== cts_double
)
9846 ("both %<long long%> and %<double%> in "
9847 "declaration specifiers"));
9850 pedwarn_c90 (loc
, OPT_Wlong_long
,
9851 "ISO C90 does not support %<long long%>");
9852 specs
->long_long_p
= 1;
9853 specs
->locations
[cdw_long_long
] = loc
;
9858 ("both %<long%> and %<short%> in "
9859 "declaration specifiers"));
9860 else if (specs
->typespec_word
== cts_auto_type
)
9862 ("both %<long%> and %<__auto_type%> in "
9863 "declaration specifiers"));
9864 else if (specs
->typespec_word
== cts_void
)
9866 ("both %<long%> and %<void%> in "
9867 "declaration specifiers"));
9868 else if (specs
->typespec_word
== cts_int_n
)
9870 ("both %<long%> and %<__int%d%> in "
9871 "declaration specifiers"),
9872 int_n_data
[specs
->int_n_idx
].bitsize
);
9873 else if (specs
->typespec_word
== cts_bool
)
9875 ("both %<long%> and %<_Bool%> in "
9876 "declaration specifiers"));
9877 else if (specs
->typespec_word
== cts_char
)
9879 ("both %<long%> and %<char%> in "
9880 "declaration specifiers"));
9881 else if (specs
->typespec_word
== cts_float
)
9883 ("both %<long%> and %<float%> in "
9884 "declaration specifiers"));
9885 else if (specs
->typespec_word
== cts_floatn_nx
)
9887 ("both %<long%> and %<_Float%d%s%> in "
9888 "declaration specifiers"),
9889 floatn_nx_types
[specs
->floatn_nx_idx
].n
,
9890 (floatn_nx_types
[specs
->floatn_nx_idx
].extended
9893 else if (specs
->typespec_word
== cts_dfloat32
)
9895 ("both %<long%> and %<_Decimal32%> in "
9896 "declaration specifiers"));
9897 else if (specs
->typespec_word
== cts_dfloat64
)
9899 ("both %<long%> and %<_Decimal64%> in "
9900 "declaration specifiers"));
9901 else if (specs
->typespec_word
== cts_dfloat128
)
9903 ("both %<long%> and %<_Decimal128%> in "
9904 "declaration specifiers"));
9907 specs
->long_p
= true;
9908 specs
->locations
[cdw_long
] = loc
;
9912 dupe
= specs
->short_p
;
9915 ("both %<long%> and %<short%> in "
9916 "declaration specifiers"));
9917 else if (specs
->typespec_word
== cts_auto_type
)
9919 ("both %<short%> and %<__auto_type%> in "
9920 "declaration specifiers"));
9921 else if (specs
->typespec_word
== cts_void
)
9923 ("both %<short%> and %<void%> in "
9924 "declaration specifiers"));
9925 else if (specs
->typespec_word
== cts_int_n
)
9927 ("both %<short%> and %<__int%d%> in "
9928 "declaration specifiers"),
9929 int_n_data
[specs
->int_n_idx
].bitsize
);
9930 else if (specs
->typespec_word
== cts_bool
)
9932 ("both %<short%> and %<_Bool%> in "
9933 "declaration specifiers"));
9934 else if (specs
->typespec_word
== cts_char
)
9936 ("both %<short%> and %<char%> in "
9937 "declaration specifiers"));
9938 else if (specs
->typespec_word
== cts_float
)
9940 ("both %<short%> and %<float%> in "
9941 "declaration specifiers"));
9942 else if (specs
->typespec_word
== cts_double
)
9944 ("both %<short%> and %<double%> in "
9945 "declaration specifiers"));
9946 else if (specs
->typespec_word
== cts_floatn_nx
)
9948 ("both %<short%> and %<_Float%d%s%> in "
9949 "declaration specifiers"),
9950 floatn_nx_types
[specs
->floatn_nx_idx
].n
,
9951 (floatn_nx_types
[specs
->floatn_nx_idx
].extended
9954 else if (specs
->typespec_word
== cts_dfloat32
)
9956 ("both %<short%> and %<_Decimal32%> in "
9957 "declaration specifiers"));
9958 else if (specs
->typespec_word
== cts_dfloat64
)
9960 ("both %<short%> and %<_Decimal64%> in "
9961 "declaration specifiers"));
9962 else if (specs
->typespec_word
== cts_dfloat128
)
9964 ("both %<short%> and %<_Decimal128%> in "
9965 "declaration specifiers"));
9968 specs
->short_p
= true;
9969 specs
->locations
[cdw_short
] = loc
;
9973 dupe
= specs
->signed_p
;
9974 if (specs
->unsigned_p
)
9976 ("both %<signed%> and %<unsigned%> in "
9977 "declaration specifiers"));
9978 else if (specs
->typespec_word
== cts_auto_type
)
9980 ("both %<signed%> and %<__auto_type%> in "
9981 "declaration specifiers"));
9982 else if (specs
->typespec_word
== cts_void
)
9984 ("both %<signed%> and %<void%> in "
9985 "declaration specifiers"));
9986 else if (specs
->typespec_word
== cts_bool
)
9988 ("both %<signed%> and %<_Bool%> in "
9989 "declaration specifiers"));
9990 else if (specs
->typespec_word
== cts_float
)
9992 ("both %<signed%> and %<float%> in "
9993 "declaration specifiers"));
9994 else if (specs
->typespec_word
== cts_double
)
9996 ("both %<signed%> and %<double%> in "
9997 "declaration specifiers"));
9998 else if (specs
->typespec_word
== cts_floatn_nx
)
10000 ("both %<signed%> and %<_Float%d%s%> in "
10001 "declaration specifiers"),
10002 floatn_nx_types
[specs
->floatn_nx_idx
].n
,
10003 (floatn_nx_types
[specs
->floatn_nx_idx
].extended
10006 else if (specs
->typespec_word
== cts_dfloat32
)
10008 ("both %<signed%> and %<_Decimal32%> in "
10009 "declaration specifiers"));
10010 else if (specs
->typespec_word
== cts_dfloat64
)
10012 ("both %<signed%> and %<_Decimal64%> in "
10013 "declaration specifiers"));
10014 else if (specs
->typespec_word
== cts_dfloat128
)
10016 ("both %<signed%> and %<_Decimal128%> in "
10017 "declaration specifiers"));
10020 specs
->signed_p
= true;
10021 specs
->locations
[cdw_signed
] = loc
;
10025 dupe
= specs
->unsigned_p
;
10026 if (specs
->signed_p
)
10028 ("both %<signed%> and %<unsigned%> in "
10029 "declaration specifiers"));
10030 else if (specs
->typespec_word
== cts_auto_type
)
10032 ("both %<unsigned%> and %<__auto_type%> in "
10033 "declaration specifiers"));
10034 else if (specs
->typespec_word
== cts_void
)
10036 ("both %<unsigned%> and %<void%> in "
10037 "declaration specifiers"));
10038 else if (specs
->typespec_word
== cts_bool
)
10040 ("both %<unsigned%> and %<_Bool%> in "
10041 "declaration specifiers"));
10042 else if (specs
->typespec_word
== cts_float
)
10044 ("both %<unsigned%> and %<float%> in "
10045 "declaration specifiers"));
10046 else if (specs
->typespec_word
== cts_double
)
10048 ("both %<unsigned%> and %<double%> in "
10049 "declaration specifiers"));
10050 else if (specs
->typespec_word
== cts_floatn_nx
)
10052 ("both %<unsigned%> and %<_Float%d%s%> in "
10053 "declaration specifiers"),
10054 floatn_nx_types
[specs
->floatn_nx_idx
].n
,
10055 (floatn_nx_types
[specs
->floatn_nx_idx
].extended
10058 else if (specs
->typespec_word
== cts_dfloat32
)
10060 ("both %<unsigned%> and %<_Decimal32%> in "
10061 "declaration specifiers"));
10062 else if (specs
->typespec_word
== cts_dfloat64
)
10064 ("both %<unsigned%> and %<_Decimal64%> in "
10065 "declaration specifiers"));
10066 else if (specs
->typespec_word
== cts_dfloat128
)
10068 ("both %<unsigned%> and %<_Decimal128%> in "
10069 "declaration specifiers"));
10072 specs
->unsigned_p
= true;
10073 specs
->locations
[cdw_unsigned
] = loc
;
10077 dupe
= specs
->complex_p
;
10078 if (!in_system_header_at (loc
))
10079 pedwarn_c90 (loc
, OPT_Wpedantic
,
10080 "ISO C90 does not support complex types");
10081 if (specs
->typespec_word
== cts_auto_type
)
10083 ("both %<complex%> and %<__auto_type%> in "
10084 "declaration specifiers"));
10085 else if (specs
->typespec_word
== cts_void
)
10087 ("both %<complex%> and %<void%> in "
10088 "declaration specifiers"));
10089 else if (specs
->typespec_word
== cts_bool
)
10091 ("both %<complex%> and %<_Bool%> in "
10092 "declaration specifiers"));
10093 else if (specs
->typespec_word
== cts_dfloat32
)
10095 ("both %<complex%> and %<_Decimal32%> in "
10096 "declaration specifiers"));
10097 else if (specs
->typespec_word
== cts_dfloat64
)
10099 ("both %<complex%> and %<_Decimal64%> in "
10100 "declaration specifiers"));
10101 else if (specs
->typespec_word
== cts_dfloat128
)
10103 ("both %<complex%> and %<_Decimal128%> in "
10104 "declaration specifiers"));
10105 else if (specs
->typespec_word
== cts_fract
)
10107 ("both %<complex%> and %<_Fract%> in "
10108 "declaration specifiers"));
10109 else if (specs
->typespec_word
== cts_accum
)
10111 ("both %<complex%> and %<_Accum%> in "
10112 "declaration specifiers"));
10113 else if (specs
->saturating_p
)
10115 ("both %<complex%> and %<_Sat%> in "
10116 "declaration specifiers"));
10119 specs
->complex_p
= true;
10120 specs
->locations
[cdw_complex
] = loc
;
10124 dupe
= specs
->saturating_p
;
10125 pedwarn (loc
, OPT_Wpedantic
,
10126 "ISO C does not support saturating types");
10127 if (specs
->typespec_word
== cts_int_n
)
10130 ("both %<_Sat%> and %<__int%d%> in "
10131 "declaration specifiers"),
10132 int_n_data
[specs
->int_n_idx
].bitsize
);
10134 else if (specs
->typespec_word
== cts_auto_type
)
10136 ("both %<_Sat%> and %<__auto_type%> in "
10137 "declaration specifiers"));
10138 else if (specs
->typespec_word
== cts_void
)
10140 ("both %<_Sat%> and %<void%> in "
10141 "declaration specifiers"));
10142 else if (specs
->typespec_word
== cts_bool
)
10144 ("both %<_Sat%> and %<_Bool%> in "
10145 "declaration specifiers"));
10146 else if (specs
->typespec_word
== cts_char
)
10148 ("both %<_Sat%> and %<char%> in "
10149 "declaration specifiers"));
10150 else if (specs
->typespec_word
== cts_int
)
10152 ("both %<_Sat%> and %<int%> in "
10153 "declaration specifiers"));
10154 else if (specs
->typespec_word
== cts_float
)
10156 ("both %<_Sat%> and %<float%> in "
10157 "declaration specifiers"));
10158 else if (specs
->typespec_word
== cts_double
)
10160 ("both %<_Sat%> and %<double%> in "
10161 "declaration specifiers"));
10162 else if (specs
->typespec_word
== cts_floatn_nx
)
10164 ("both %<_Sat%> and %<_Float%d%s%> in "
10165 "declaration specifiers"),
10166 floatn_nx_types
[specs
->floatn_nx_idx
].n
,
10167 (floatn_nx_types
[specs
->floatn_nx_idx
].extended
10170 else if (specs
->typespec_word
== cts_dfloat32
)
10172 ("both %<_Sat%> and %<_Decimal32%> in "
10173 "declaration specifiers"));
10174 else if (specs
->typespec_word
== cts_dfloat64
)
10176 ("both %<_Sat%> and %<_Decimal64%> in "
10177 "declaration specifiers"));
10178 else if (specs
->typespec_word
== cts_dfloat128
)
10180 ("both %<_Sat%> and %<_Decimal128%> in "
10181 "declaration specifiers"));
10182 else if (specs
->complex_p
)
10184 ("both %<_Sat%> and %<complex%> in "
10185 "declaration specifiers"));
10188 specs
->saturating_p
= true;
10189 specs
->locations
[cdw_saturating
] = loc
;
10193 gcc_unreachable ();
10197 error_at (loc
, "duplicate %qE", type
);
10203 /* "void", "_Bool", "char", "int", "float", "double",
10204 "_FloatN", "_FloatNx", "_Decimal32", "__intN",
10205 "_Decimal64", "_Decimal128", "_Fract", "_Accum" or
10207 if (specs
->typespec_word
!= cts_none
)
10210 "two or more data types in declaration specifiers");
10215 case RID_AUTO_TYPE
:
10218 ("both %<long%> and %<__auto_type%> in "
10219 "declaration specifiers"));
10220 else if (specs
->short_p
)
10222 ("both %<short%> and %<__auto_type%> in "
10223 "declaration specifiers"));
10224 else if (specs
->signed_p
)
10226 ("both %<signed%> and %<__auto_type%> in "
10227 "declaration specifiers"));
10228 else if (specs
->unsigned_p
)
10230 ("both %<unsigned%> and %<__auto_type%> in "
10231 "declaration specifiers"));
10232 else if (specs
->complex_p
)
10234 ("both %<complex%> and %<__auto_type%> in "
10235 "declaration specifiers"));
10236 else if (specs
->saturating_p
)
10238 ("both %<_Sat%> and %<__auto_type%> in "
10239 "declaration specifiers"));
10242 specs
->typespec_word
= cts_auto_type
;
10243 specs
->locations
[cdw_typespec
] = loc
;
10250 specs
->int_n_idx
= i
- RID_INT_N_0
;
10251 if (!in_system_header_at (input_location
))
10252 pedwarn (loc
, OPT_Wpedantic
,
10253 "ISO C does not support %<__int%d%> types",
10254 int_n_data
[specs
->int_n_idx
].bitsize
);
10258 ("both %<__int%d%> and %<long%> in "
10259 "declaration specifiers"),
10260 int_n_data
[specs
->int_n_idx
].bitsize
);
10261 else if (specs
->saturating_p
)
10263 ("both %<_Sat%> and %<__int%d%> in "
10264 "declaration specifiers"),
10265 int_n_data
[specs
->int_n_idx
].bitsize
);
10266 else if (specs
->short_p
)
10268 ("both %<__int%d%> and %<short%> in "
10269 "declaration specifiers"),
10270 int_n_data
[specs
->int_n_idx
].bitsize
);
10271 else if (! int_n_enabled_p
[specs
->int_n_idx
])
10273 specs
->typespec_word
= cts_int_n
;
10275 "%<__int%d%> is not supported on this target",
10276 int_n_data
[specs
->int_n_idx
].bitsize
);
10280 specs
->typespec_word
= cts_int_n
;
10281 specs
->locations
[cdw_typespec
] = loc
;
10287 ("both %<long%> and %<void%> in "
10288 "declaration specifiers"));
10289 else if (specs
->short_p
)
10291 ("both %<short%> and %<void%> in "
10292 "declaration specifiers"));
10293 else if (specs
->signed_p
)
10295 ("both %<signed%> and %<void%> in "
10296 "declaration specifiers"));
10297 else if (specs
->unsigned_p
)
10299 ("both %<unsigned%> and %<void%> in "
10300 "declaration specifiers"));
10301 else if (specs
->complex_p
)
10303 ("both %<complex%> and %<void%> in "
10304 "declaration specifiers"));
10305 else if (specs
->saturating_p
)
10307 ("both %<_Sat%> and %<void%> in "
10308 "declaration specifiers"));
10311 specs
->typespec_word
= cts_void
;
10312 specs
->locations
[cdw_typespec
] = loc
;
10316 if (!in_system_header_at (loc
))
10317 pedwarn_c90 (loc
, OPT_Wpedantic
,
10318 "ISO C90 does not support boolean types");
10321 ("both %<long%> and %<_Bool%> in "
10322 "declaration specifiers"));
10323 else if (specs
->short_p
)
10325 ("both %<short%> and %<_Bool%> in "
10326 "declaration specifiers"));
10327 else if (specs
->signed_p
)
10329 ("both %<signed%> and %<_Bool%> in "
10330 "declaration specifiers"));
10331 else if (specs
->unsigned_p
)
10333 ("both %<unsigned%> and %<_Bool%> in "
10334 "declaration specifiers"));
10335 else if (specs
->complex_p
)
10337 ("both %<complex%> and %<_Bool%> in "
10338 "declaration specifiers"));
10339 else if (specs
->saturating_p
)
10341 ("both %<_Sat%> and %<_Bool%> in "
10342 "declaration specifiers"));
10345 specs
->typespec_word
= cts_bool
;
10346 specs
->locations
[cdw_typespec
] = loc
;
10352 ("both %<long%> and %<char%> in "
10353 "declaration specifiers"));
10354 else if (specs
->short_p
)
10356 ("both %<short%> and %<char%> in "
10357 "declaration specifiers"));
10358 else if (specs
->saturating_p
)
10360 ("both %<_Sat%> and %<char%> in "
10361 "declaration specifiers"));
10364 specs
->typespec_word
= cts_char
;
10365 specs
->locations
[cdw_typespec
] = loc
;
10369 if (specs
->saturating_p
)
10371 ("both %<_Sat%> and %<int%> in "
10372 "declaration specifiers"));
10375 specs
->typespec_word
= cts_int
;
10376 specs
->locations
[cdw_typespec
] = loc
;
10382 ("both %<long%> and %<float%> in "
10383 "declaration specifiers"));
10384 else if (specs
->short_p
)
10386 ("both %<short%> and %<float%> in "
10387 "declaration specifiers"));
10388 else if (specs
->signed_p
)
10390 ("both %<signed%> and %<float%> in "
10391 "declaration specifiers"));
10392 else if (specs
->unsigned_p
)
10394 ("both %<unsigned%> and %<float%> in "
10395 "declaration specifiers"));
10396 else if (specs
->saturating_p
)
10398 ("both %<_Sat%> and %<float%> in "
10399 "declaration specifiers"));
10402 specs
->typespec_word
= cts_float
;
10403 specs
->locations
[cdw_typespec
] = loc
;
10407 if (specs
->long_long_p
)
10409 ("both %<long long%> and %<double%> in "
10410 "declaration specifiers"));
10411 else if (specs
->short_p
)
10413 ("both %<short%> and %<double%> in "
10414 "declaration specifiers"));
10415 else if (specs
->signed_p
)
10417 ("both %<signed%> and %<double%> in "
10418 "declaration specifiers"));
10419 else if (specs
->unsigned_p
)
10421 ("both %<unsigned%> and %<double%> in "
10422 "declaration specifiers"));
10423 else if (specs
->saturating_p
)
10425 ("both %<_Sat%> and %<double%> in "
10426 "declaration specifiers"));
10429 specs
->typespec_word
= cts_double
;
10430 specs
->locations
[cdw_typespec
] = loc
;
10433 CASE_RID_FLOATN_NX
:
10434 specs
->floatn_nx_idx
= i
- RID_FLOATN_NX_FIRST
;
10435 if (!in_system_header_at (input_location
))
10436 pedwarn (loc
, OPT_Wpedantic
,
10437 "ISO C does not support the %<_Float%d%s%> type",
10438 floatn_nx_types
[specs
->floatn_nx_idx
].n
,
10439 (floatn_nx_types
[specs
->floatn_nx_idx
].extended
10445 ("both %<long%> and %<_Float%d%s%> in "
10446 "declaration specifiers"),
10447 floatn_nx_types
[specs
->floatn_nx_idx
].n
,
10448 (floatn_nx_types
[specs
->floatn_nx_idx
].extended
10451 else if (specs
->short_p
)
10453 ("both %<short%> and %<_Float%d%s%> in "
10454 "declaration specifiers"),
10455 floatn_nx_types
[specs
->floatn_nx_idx
].n
,
10456 (floatn_nx_types
[specs
->floatn_nx_idx
].extended
10459 else if (specs
->signed_p
)
10461 ("both %<signed%> and %<_Float%d%s%> in "
10462 "declaration specifiers"),
10463 floatn_nx_types
[specs
->floatn_nx_idx
].n
,
10464 (floatn_nx_types
[specs
->floatn_nx_idx
].extended
10467 else if (specs
->unsigned_p
)
10469 ("both %<unsigned%> and %<_Float%d%s%> in "
10470 "declaration specifiers"),
10471 floatn_nx_types
[specs
->floatn_nx_idx
].n
,
10472 (floatn_nx_types
[specs
->floatn_nx_idx
].extended
10475 else if (specs
->saturating_p
)
10477 ("both %<_Sat%> and %<_Float%d%s%> in "
10478 "declaration specifiers"),
10479 floatn_nx_types
[specs
->floatn_nx_idx
].n
,
10480 (floatn_nx_types
[specs
->floatn_nx_idx
].extended
10483 else if (FLOATN_NX_TYPE_NODE (specs
->floatn_nx_idx
) == NULL_TREE
)
10485 specs
->typespec_word
= cts_floatn_nx
;
10487 "%<_Float%d%s%> is not supported on this target",
10488 floatn_nx_types
[specs
->floatn_nx_idx
].n
,
10489 (floatn_nx_types
[specs
->floatn_nx_idx
].extended
10495 specs
->typespec_word
= cts_floatn_nx
;
10496 specs
->locations
[cdw_typespec
] = loc
;
10501 case RID_DFLOAT128
:
10504 if (i
== RID_DFLOAT32
)
10505 str
= "_Decimal32";
10506 else if (i
== RID_DFLOAT64
)
10507 str
= "_Decimal64";
10509 str
= "_Decimal128";
10510 if (specs
->long_long_p
)
10512 ("both %<long long%> and %qs in "
10513 "declaration specifiers"),
10517 ("both %<long%> and %qs in "
10518 "declaration specifiers"),
10520 else if (specs
->short_p
)
10522 ("both %<short%> and %qs in "
10523 "declaration specifiers"),
10525 else if (specs
->signed_p
)
10527 ("both %<signed%> and %qs in "
10528 "declaration specifiers"),
10530 else if (specs
->unsigned_p
)
10532 ("both %<unsigned%> and %qs in "
10533 "declaration specifiers"),
10535 else if (specs
->complex_p
)
10537 ("both %<complex%> and %qs in "
10538 "declaration specifiers"),
10540 else if (specs
->saturating_p
)
10542 ("both %<_Sat%> and %qs in "
10543 "declaration specifiers"),
10545 else if (i
== RID_DFLOAT32
)
10546 specs
->typespec_word
= cts_dfloat32
;
10547 else if (i
== RID_DFLOAT64
)
10548 specs
->typespec_word
= cts_dfloat64
;
10550 specs
->typespec_word
= cts_dfloat128
;
10551 specs
->locations
[cdw_typespec
] = loc
;
10553 if (!targetm
.decimal_float_supported_p ())
10555 ("decimal floating point not supported "
10556 "for this target"));
10557 pedwarn (loc
, OPT_Wpedantic
,
10558 "ISO C does not support decimal floating point");
10564 if (i
== RID_FRACT
)
10568 if (specs
->complex_p
)
10570 ("both %<complex%> and %qs in "
10571 "declaration specifiers"),
10573 else if (i
== RID_FRACT
)
10574 specs
->typespec_word
= cts_fract
;
10576 specs
->typespec_word
= cts_accum
;
10577 specs
->locations
[cdw_typespec
] = loc
;
10579 if (!targetm
.fixed_point_supported_p ())
10581 "fixed-point types not supported for this target");
10582 pedwarn (loc
, OPT_Wpedantic
,
10583 "ISO C does not support fixed-point types");
10586 /* ObjC reserved word "id", handled below. */
10592 /* Now we have a typedef (a TYPE_DECL node), an identifier (some
10593 form of ObjC type, cases such as "int" and "long" being handled
10594 above), a TYPE (struct, union, enum and typeof specifiers) or an
10595 ERROR_MARK. In none of these cases may there have previously
10596 been any type specifiers. */
10597 if (specs
->type
|| specs
->typespec_word
!= cts_none
10598 || specs
->long_p
|| specs
->short_p
|| specs
->signed_p
10599 || specs
->unsigned_p
|| specs
->complex_p
)
10600 error_at (loc
, "two or more data types in declaration specifiers");
10601 else if (TREE_CODE (type
) == TYPE_DECL
)
10603 if (TREE_TYPE (type
) == error_mark_node
)
10604 ; /* Allow the type to default to int to avoid cascading errors. */
10607 specs
->type
= TREE_TYPE (type
);
10608 specs
->decl_attr
= DECL_ATTRIBUTES (type
);
10609 specs
->typedef_p
= true;
10610 specs
->explicit_signed_p
= C_TYPEDEF_EXPLICITLY_SIGNED (type
);
10611 specs
->locations
[cdw_typedef
] = loc
;
10613 /* If this typedef name is defined in a struct, then a C++
10614 lookup would return a different value. */
10615 if (warn_cxx_compat
10616 && I_SYMBOL_BINDING (DECL_NAME (type
))->in_struct
)
10617 warning_at (loc
, OPT_Wc___compat
,
10618 "C++ lookup of %qD would return a field, not a type",
10621 /* If we are parsing a struct, record that a struct field
10623 if (warn_cxx_compat
&& struct_parse_info
!= NULL
)
10624 struct_parse_info
->typedefs_seen
.safe_push (type
);
10627 else if (TREE_CODE (type
) == IDENTIFIER_NODE
)
10629 tree t
= lookup_name (type
);
10630 if (!t
|| TREE_CODE (t
) != TYPE_DECL
)
10631 error_at (loc
, "%qE fails to be a typedef or built in type", type
);
10632 else if (TREE_TYPE (t
) == error_mark_node
)
10636 specs
->type
= TREE_TYPE (t
);
10637 specs
->locations
[cdw_typespec
] = loc
;
10642 if (TREE_CODE (type
) != ERROR_MARK
&& spec
.kind
== ctsk_typeof
)
10644 specs
->typedef_p
= true;
10645 specs
->locations
[cdw_typedef
] = loc
;
10649 specs
->expr
= build2 (COMPOUND_EXPR
, TREE_TYPE (spec
.expr
),
10650 specs
->expr
, spec
.expr
);
10652 specs
->expr
= spec
.expr
;
10653 specs
->expr_const_operands
&= spec
.expr_const_operands
;
10656 specs
->type
= type
;
10662 /* Add the storage class specifier or function specifier SCSPEC to the
10663 declaration specifiers SPECS, returning SPECS. */
10665 struct c_declspecs
*
10666 declspecs_add_scspec (source_location loc
,
10667 struct c_declspecs
*specs
,
10671 enum c_storage_class n
= csc_none
;
10673 specs
->declspecs_seen_p
= true;
10674 gcc_assert (TREE_CODE (scspec
) == IDENTIFIER_NODE
10675 && C_IS_RESERVED_WORD (scspec
));
10676 i
= C_RID_CODE (scspec
);
10677 if (specs
->non_sc_seen_p
)
10678 warning (OPT_Wold_style_declaration
,
10679 "%qE is not at beginning of declaration", scspec
);
10683 /* C99 permits duplicate inline. Although of doubtful utility,
10684 it seems simplest to permit it in gnu89 mode as well, as
10685 there is also little utility in maintaining this as a
10686 difference between gnu89 and C99 inline. */
10688 specs
->inline_p
= true;
10689 specs
->locations
[cdw_inline
] = loc
;
10692 /* Duplicate _Noreturn is permitted. */
10694 specs
->noreturn_p
= true;
10695 specs
->locations
[cdw_noreturn
] = loc
;
10698 dupe
= specs
->thread_p
;
10699 if (specs
->storage_class
== csc_auto
)
10700 error ("%qE used with %<auto%>", scspec
);
10701 else if (specs
->storage_class
== csc_register
)
10702 error ("%qE used with %<register%>", scspec
);
10703 else if (specs
->storage_class
== csc_typedef
)
10704 error ("%qE used with %<typedef%>", scspec
);
10707 specs
->thread_p
= true;
10708 specs
->thread_gnu_p
= (strcmp (IDENTIFIER_POINTER (scspec
),
10710 /* A diagnostic is not required for the use of this
10711 identifier in the implementation namespace; only diagnose
10712 it for the C11 spelling because of existing code using
10713 the other spelling. */
10714 if (!specs
->thread_gnu_p
)
10717 pedwarn_c99 (loc
, OPT_Wpedantic
,
10718 "ISO C99 does not support %qE", scspec
);
10720 pedwarn_c99 (loc
, OPT_Wpedantic
,
10721 "ISO C90 does not support %qE", scspec
);
10723 specs
->locations
[cdw_thread
] = loc
;
10731 /* Diagnose "__thread extern". */
10732 if (specs
->thread_p
&& specs
->thread_gnu_p
)
10733 error ("%<__thread%> before %<extern%>");
10740 /* Diagnose "__thread static". */
10741 if (specs
->thread_p
&& specs
->thread_gnu_p
)
10742 error ("%<__thread%> before %<static%>");
10748 gcc_unreachable ();
10750 if (n
!= csc_none
&& n
== specs
->storage_class
)
10754 if (i
== RID_THREAD
)
10755 error ("duplicate %<_Thread_local%> or %<__thread%>");
10757 error ("duplicate %qE", scspec
);
10761 if (specs
->storage_class
!= csc_none
&& n
!= specs
->storage_class
)
10763 error ("multiple storage classes in declaration specifiers");
10767 specs
->storage_class
= n
;
10768 specs
->locations
[cdw_storage_class
] = loc
;
10769 if (n
!= csc_extern
&& n
!= csc_static
&& specs
->thread_p
)
10771 error ("%qs used with %qE",
10772 specs
->thread_gnu_p
? "__thread" : "_Thread_local",
10774 specs
->thread_p
= false;
10781 /* Add the attributes ATTRS to the declaration specifiers SPECS,
10782 returning SPECS. */
10784 struct c_declspecs
*
10785 declspecs_add_attrs (source_location loc
, struct c_declspecs
*specs
, tree attrs
)
10787 specs
->attrs
= chainon (attrs
, specs
->attrs
);
10788 specs
->locations
[cdw_attributes
] = loc
;
10789 specs
->declspecs_seen_p
= true;
10793 /* Add an _Alignas specifier (expression ALIGN, or type whose
10794 alignment is ALIGN) to the declaration specifiers SPECS, returning
10796 struct c_declspecs
*
10797 declspecs_add_alignas (source_location loc
,
10798 struct c_declspecs
*specs
, tree align
)
10801 specs
->alignas_p
= true;
10802 specs
->locations
[cdw_alignas
] = loc
;
10803 if (align
== error_mark_node
)
10805 align_log
= check_user_alignment (align
, true);
10806 if (align_log
> specs
->align_log
)
10807 specs
->align_log
= align_log
;
10811 /* Combine "long", "short", "signed", "unsigned" and "_Complex" type
10812 specifiers with any other type specifier to determine the resulting
10813 type. This is where ISO C checks on complex types are made, since
10814 "_Complex long" is a prefix of the valid ISO C type "_Complex long
10817 struct c_declspecs
*
10818 finish_declspecs (struct c_declspecs
*specs
)
10820 /* If a type was specified as a whole, we have no modifiers and are
10822 if (specs
->type
!= NULL_TREE
)
10824 gcc_assert (!specs
->long_p
&& !specs
->long_long_p
&& !specs
->short_p
10825 && !specs
->signed_p
&& !specs
->unsigned_p
10826 && !specs
->complex_p
);
10828 /* Set a dummy type. */
10829 if (TREE_CODE (specs
->type
) == ERROR_MARK
)
10830 specs
->type
= integer_type_node
;
10834 /* If none of "void", "_Bool", "char", "int", "float" or "double"
10835 has been specified, treat it as "int" unless "_Complex" is
10836 present and there are no other specifiers. If we just have
10837 "_Complex", it is equivalent to "_Complex double", but e.g.
10838 "_Complex short" is equivalent to "_Complex short int". */
10839 if (specs
->typespec_word
== cts_none
)
10841 if (specs
->saturating_p
)
10843 error_at (specs
->locations
[cdw_saturating
],
10844 "%<_Sat%> is used without %<_Fract%> or %<_Accum%>");
10845 if (!targetm
.fixed_point_supported_p ())
10846 error_at (specs
->locations
[cdw_saturating
],
10847 "fixed-point types not supported for this target");
10848 specs
->typespec_word
= cts_fract
;
10850 else if (specs
->long_p
|| specs
->short_p
10851 || specs
->signed_p
|| specs
->unsigned_p
)
10853 specs
->typespec_word
= cts_int
;
10855 else if (specs
->complex_p
)
10857 specs
->typespec_word
= cts_double
;
10858 pedwarn (specs
->locations
[cdw_complex
], OPT_Wpedantic
,
10859 "ISO C does not support plain %<complex%> meaning "
10860 "%<double complex%>");
10864 specs
->typespec_word
= cts_int
;
10865 specs
->default_int_p
= true;
10866 /* We don't diagnose this here because grokdeclarator will
10867 give more specific diagnostics according to whether it is
10868 a function definition. */
10872 /* If "signed" was specified, record this to distinguish "int" and
10873 "signed int" in the case of a bit-field with
10874 -funsigned-bitfields. */
10875 specs
->explicit_signed_p
= specs
->signed_p
;
10877 /* Now compute the actual type. */
10878 switch (specs
->typespec_word
)
10880 case cts_auto_type
:
10881 gcc_assert (!specs
->long_p
&& !specs
->short_p
10882 && !specs
->signed_p
&& !specs
->unsigned_p
10883 && !specs
->complex_p
);
10884 /* Type to be filled in later. */
10887 gcc_assert (!specs
->long_p
&& !specs
->short_p
10888 && !specs
->signed_p
&& !specs
->unsigned_p
10889 && !specs
->complex_p
);
10890 specs
->type
= void_type_node
;
10893 gcc_assert (!specs
->long_p
&& !specs
->short_p
10894 && !specs
->signed_p
&& !specs
->unsigned_p
10895 && !specs
->complex_p
);
10896 specs
->type
= boolean_type_node
;
10899 gcc_assert (!specs
->long_p
&& !specs
->short_p
);
10900 gcc_assert (!(specs
->signed_p
&& specs
->unsigned_p
));
10901 if (specs
->signed_p
)
10902 specs
->type
= signed_char_type_node
;
10903 else if (specs
->unsigned_p
)
10904 specs
->type
= unsigned_char_type_node
;
10906 specs
->type
= char_type_node
;
10907 if (specs
->complex_p
)
10909 pedwarn (specs
->locations
[cdw_complex
], OPT_Wpedantic
,
10910 "ISO C does not support complex integer types");
10911 specs
->type
= build_complex_type (specs
->type
);
10915 gcc_assert (!specs
->long_p
&& !specs
->short_p
&& !specs
->long_long_p
);
10916 gcc_assert (!(specs
->signed_p
&& specs
->unsigned_p
));
10917 if (! int_n_enabled_p
[specs
->int_n_idx
])
10918 specs
->type
= integer_type_node
;
10920 specs
->type
= (specs
->unsigned_p
10921 ? int_n_trees
[specs
->int_n_idx
].unsigned_type
10922 : int_n_trees
[specs
->int_n_idx
].signed_type
);
10923 if (specs
->complex_p
)
10925 pedwarn (specs
->locations
[cdw_complex
], OPT_Wpedantic
,
10926 "ISO C does not support complex integer types");
10927 specs
->type
= build_complex_type (specs
->type
);
10931 gcc_assert (!(specs
->long_p
&& specs
->short_p
));
10932 gcc_assert (!(specs
->signed_p
&& specs
->unsigned_p
));
10933 if (specs
->long_long_p
)
10934 specs
->type
= (specs
->unsigned_p
10935 ? long_long_unsigned_type_node
10936 : long_long_integer_type_node
);
10937 else if (specs
->long_p
)
10938 specs
->type
= (specs
->unsigned_p
10939 ? long_unsigned_type_node
10940 : long_integer_type_node
);
10941 else if (specs
->short_p
)
10942 specs
->type
= (specs
->unsigned_p
10943 ? short_unsigned_type_node
10944 : short_integer_type_node
);
10946 specs
->type
= (specs
->unsigned_p
10947 ? unsigned_type_node
10948 : integer_type_node
);
10949 if (specs
->complex_p
)
10951 pedwarn (specs
->locations
[cdw_complex
], OPT_Wpedantic
,
10952 "ISO C does not support complex integer types");
10953 specs
->type
= build_complex_type (specs
->type
);
10957 gcc_assert (!specs
->long_p
&& !specs
->short_p
10958 && !specs
->signed_p
&& !specs
->unsigned_p
);
10959 specs
->type
= (specs
->complex_p
10960 ? complex_float_type_node
10961 : float_type_node
);
10964 gcc_assert (!specs
->long_long_p
&& !specs
->short_p
10965 && !specs
->signed_p
&& !specs
->unsigned_p
);
10968 specs
->type
= (specs
->complex_p
10969 ? complex_long_double_type_node
10970 : long_double_type_node
);
10974 specs
->type
= (specs
->complex_p
10975 ? complex_double_type_node
10976 : double_type_node
);
10979 case cts_floatn_nx
:
10980 gcc_assert (!specs
->long_p
&& !specs
->short_p
10981 && !specs
->signed_p
&& !specs
->unsigned_p
);
10982 if (FLOATN_NX_TYPE_NODE (specs
->floatn_nx_idx
) == NULL_TREE
)
10983 specs
->type
= integer_type_node
;
10984 else if (specs
->complex_p
)
10985 specs
->type
= COMPLEX_FLOATN_NX_TYPE_NODE (specs
->floatn_nx_idx
);
10987 specs
->type
= FLOATN_NX_TYPE_NODE (specs
->floatn_nx_idx
);
10991 case cts_dfloat128
:
10992 gcc_assert (!specs
->long_p
&& !specs
->long_long_p
&& !specs
->short_p
10993 && !specs
->signed_p
&& !specs
->unsigned_p
&& !specs
->complex_p
);
10994 if (specs
->typespec_word
== cts_dfloat32
)
10995 specs
->type
= dfloat32_type_node
;
10996 else if (specs
->typespec_word
== cts_dfloat64
)
10997 specs
->type
= dfloat64_type_node
;
10999 specs
->type
= dfloat128_type_node
;
11002 gcc_assert (!specs
->complex_p
);
11003 if (!targetm
.fixed_point_supported_p ())
11004 specs
->type
= integer_type_node
;
11005 else if (specs
->saturating_p
)
11007 if (specs
->long_long_p
)
11008 specs
->type
= specs
->unsigned_p
11009 ? sat_unsigned_long_long_fract_type_node
11010 : sat_long_long_fract_type_node
;
11011 else if (specs
->long_p
)
11012 specs
->type
= specs
->unsigned_p
11013 ? sat_unsigned_long_fract_type_node
11014 : sat_long_fract_type_node
;
11015 else if (specs
->short_p
)
11016 specs
->type
= specs
->unsigned_p
11017 ? sat_unsigned_short_fract_type_node
11018 : sat_short_fract_type_node
;
11020 specs
->type
= specs
->unsigned_p
11021 ? sat_unsigned_fract_type_node
11022 : sat_fract_type_node
;
11026 if (specs
->long_long_p
)
11027 specs
->type
= specs
->unsigned_p
11028 ? unsigned_long_long_fract_type_node
11029 : long_long_fract_type_node
;
11030 else if (specs
->long_p
)
11031 specs
->type
= specs
->unsigned_p
11032 ? unsigned_long_fract_type_node
11033 : long_fract_type_node
;
11034 else if (specs
->short_p
)
11035 specs
->type
= specs
->unsigned_p
11036 ? unsigned_short_fract_type_node
11037 : short_fract_type_node
;
11039 specs
->type
= specs
->unsigned_p
11040 ? unsigned_fract_type_node
11045 gcc_assert (!specs
->complex_p
);
11046 if (!targetm
.fixed_point_supported_p ())
11047 specs
->type
= integer_type_node
;
11048 else if (specs
->saturating_p
)
11050 if (specs
->long_long_p
)
11051 specs
->type
= specs
->unsigned_p
11052 ? sat_unsigned_long_long_accum_type_node
11053 : sat_long_long_accum_type_node
;
11054 else if (specs
->long_p
)
11055 specs
->type
= specs
->unsigned_p
11056 ? sat_unsigned_long_accum_type_node
11057 : sat_long_accum_type_node
;
11058 else if (specs
->short_p
)
11059 specs
->type
= specs
->unsigned_p
11060 ? sat_unsigned_short_accum_type_node
11061 : sat_short_accum_type_node
;
11063 specs
->type
= specs
->unsigned_p
11064 ? sat_unsigned_accum_type_node
11065 : sat_accum_type_node
;
11069 if (specs
->long_long_p
)
11070 specs
->type
= specs
->unsigned_p
11071 ? unsigned_long_long_accum_type_node
11072 : long_long_accum_type_node
;
11073 else if (specs
->long_p
)
11074 specs
->type
= specs
->unsigned_p
11075 ? unsigned_long_accum_type_node
11076 : long_accum_type_node
;
11077 else if (specs
->short_p
)
11078 specs
->type
= specs
->unsigned_p
11079 ? unsigned_short_accum_type_node
11080 : short_accum_type_node
;
11082 specs
->type
= specs
->unsigned_p
11083 ? unsigned_accum_type_node
11088 gcc_unreachable ();
11094 /* Perform final processing on one file scope's declarations (or the
11095 external scope's declarations), GLOBALS. */
11098 c_write_global_declarations_1 (tree globals
)
11103 /* Process the decls in the order they were written. */
11104 for (decl
= globals
; decl
; decl
= DECL_CHAIN (decl
))
11106 /* Check for used but undefined static functions using the C
11107 standard's definition of "used", and set TREE_NO_WARNING so
11108 that check_global_declaration doesn't repeat the check. */
11109 if (TREE_CODE (decl
) == FUNCTION_DECL
11110 && DECL_INITIAL (decl
) == NULL_TREE
11111 && DECL_EXTERNAL (decl
)
11112 && !TREE_PUBLIC (decl
))
11114 if (C_DECL_USED (decl
))
11116 pedwarn (input_location
, 0, "%q+F used but never defined", decl
);
11117 TREE_NO_WARNING (decl
) = 1;
11119 /* For -Wunused-function warn about unused static prototypes. */
11120 else if (warn_unused_function
11121 && ! DECL_ARTIFICIAL (decl
)
11122 && ! TREE_NO_WARNING (decl
))
11124 warning (OPT_Wunused_function
,
11125 "%q+F declared %<static%> but never defined", decl
);
11126 TREE_NO_WARNING (decl
) = 1;
11130 wrapup_global_declaration_1 (decl
);
11135 reconsider
= false;
11136 for (decl
= globals
; decl
; decl
= DECL_CHAIN (decl
))
11137 reconsider
|= wrapup_global_declaration_2 (decl
);
11139 while (reconsider
);
11142 /* Callback to collect a source_ref from a DECL. */
11145 collect_source_ref_cb (tree decl
)
11147 if (!DECL_IS_BUILTIN (decl
))
11148 collect_source_ref (LOCATION_FILE (decl_sloc (decl
, false)));
11151 /* Preserve the external declarations scope across a garbage collect. */
11152 static GTY(()) tree ext_block
;
11154 /* Collect all references relevant to SOURCE_FILE. */
11157 collect_all_refs (const char *source_file
)
11162 FOR_EACH_VEC_ELT (*all_translation_units
, i
, t
)
11163 collect_ada_nodes (BLOCK_VARS (DECL_INITIAL (t
)), source_file
);
11165 collect_ada_nodes (BLOCK_VARS (ext_block
), source_file
);
11168 /* Iterate over all global declarations and call CALLBACK. */
11171 for_each_global_decl (void (*callback
) (tree decl
))
11178 FOR_EACH_VEC_ELT (*all_translation_units
, i
, t
)
11180 decls
= DECL_INITIAL (t
);
11181 for (decl
= BLOCK_VARS (decls
); decl
; decl
= TREE_CHAIN (decl
))
11185 for (decl
= BLOCK_VARS (ext_block
); decl
; decl
= TREE_CHAIN (decl
))
11189 /* Perform any final parser cleanups and generate initial debugging
11193 c_parse_final_cleanups (void)
11198 /* We don't want to do this if generating a PCH. */
11202 timevar_stop (TV_PHASE_PARSING
);
11203 timevar_start (TV_PHASE_DEFERRED
);
11205 /* Do the Objective-C stuff. This is where all the Objective-C
11206 module stuff gets generated (symtab, class/protocol/selector
11208 if (c_dialect_objc ())
11209 objc_write_global_declarations ();
11211 /* Close the external scope. */
11212 ext_block
= pop_scope ();
11213 external_scope
= 0;
11214 gcc_assert (!current_scope
);
11216 /* Handle -fdump-ada-spec[-slim]. */
11217 if (flag_dump_ada_spec
|| flag_dump_ada_spec_slim
)
11219 /* Build a table of files to generate specs for */
11220 if (flag_dump_ada_spec_slim
)
11221 collect_source_ref (main_input_filename
);
11223 for_each_global_decl (collect_source_ref_cb
);
11225 dump_ada_specs (collect_all_refs
, NULL
);
11228 /* Process all file scopes in this compilation, and the external_scope,
11229 through wrapup_global_declarations. */
11230 FOR_EACH_VEC_ELT (*all_translation_units
, i
, t
)
11231 c_write_global_declarations_1 (BLOCK_VARS (DECL_INITIAL (t
)));
11232 c_write_global_declarations_1 (BLOCK_VARS (ext_block
));
11234 timevar_stop (TV_PHASE_DEFERRED
);
11235 timevar_start (TV_PHASE_PARSING
);
11240 /* Register reserved keyword WORD as qualifier for address space AS. */
11243 c_register_addr_space (const char *word
, addr_space_t as
)
11245 int rid
= RID_FIRST_ADDR_SPACE
+ as
;
11248 /* Address space qualifiers are only supported
11249 in C with GNU extensions enabled. */
11250 if (c_dialect_objc () || flag_no_asm
)
11253 id
= get_identifier (word
);
11254 C_SET_RID_CODE (id
, rid
);
11255 C_IS_RESERVED_WORD (id
) = 1;
11256 ridpointers
[rid
] = id
;
11259 /* Return identifier to look up for omp declare reduction. */
11262 c_omp_reduction_id (enum tree_code reduction_code
, tree reduction_id
)
11264 const char *p
= NULL
;
11265 switch (reduction_code
)
11267 case PLUS_EXPR
: p
= "+"; break;
11268 case MULT_EXPR
: p
= "*"; break;
11269 case MINUS_EXPR
: p
= "-"; break;
11270 case BIT_AND_EXPR
: p
= "&"; break;
11271 case BIT_XOR_EXPR
: p
= "^"; break;
11272 case BIT_IOR_EXPR
: p
= "|"; break;
11273 case TRUTH_ANDIF_EXPR
: p
= "&&"; break;
11274 case TRUTH_ORIF_EXPR
: p
= "||"; break;
11275 case MIN_EXPR
: p
= "min"; break;
11276 case MAX_EXPR
: p
= "max"; break;
11283 if (TREE_CODE (reduction_id
) != IDENTIFIER_NODE
)
11284 return error_mark_node
;
11285 p
= IDENTIFIER_POINTER (reduction_id
);
11288 const char prefix
[] = "omp declare reduction ";
11289 size_t lenp
= sizeof (prefix
);
11290 size_t len
= strlen (p
);
11291 char *name
= XALLOCAVEC (char, lenp
+ len
);
11292 memcpy (name
, prefix
, lenp
- 1);
11293 memcpy (name
+ lenp
- 1, p
, len
+ 1);
11294 return get_identifier (name
);
11297 /* Lookup REDUCTION_ID in the current scope, or create an artificial
11298 VAR_DECL, bind it into the current scope and return it. */
11301 c_omp_reduction_decl (tree reduction_id
)
11303 struct c_binding
*b
= I_SYMBOL_BINDING (reduction_id
);
11304 if (b
!= NULL
&& B_IN_CURRENT_SCOPE (b
))
11307 tree decl
= build_decl (BUILTINS_LOCATION
, VAR_DECL
,
11308 reduction_id
, integer_type_node
);
11309 DECL_ARTIFICIAL (decl
) = 1;
11310 DECL_EXTERNAL (decl
) = 1;
11311 TREE_STATIC (decl
) = 1;
11312 TREE_PUBLIC (decl
) = 0;
11313 bind (reduction_id
, decl
, current_scope
, true, false, BUILTINS_LOCATION
);
11317 /* Lookup REDUCTION_ID in the first scope where it has entry for TYPE. */
11320 c_omp_reduction_lookup (tree reduction_id
, tree type
)
11322 struct c_binding
*b
= I_SYMBOL_BINDING (reduction_id
);
11326 for (t
= DECL_INITIAL (b
->decl
); t
; t
= TREE_CHAIN (t
))
11327 if (comptypes (TREE_PURPOSE (t
), type
))
11328 return TREE_VALUE (t
);
11331 return error_mark_node
;
11334 /* Helper function called via walk_tree, to diagnose invalid
11335 #pragma omp declare reduction combiners or initializers. */
11338 c_check_omp_declare_reduction_r (tree
*tp
, int *, void *data
)
11340 tree
*vars
= (tree
*) data
;
11341 if (SSA_VAR_P (*tp
)
11342 && !DECL_ARTIFICIAL (*tp
)
11346 location_t loc
= DECL_SOURCE_LOCATION (vars
[0]);
11347 if (strcmp (IDENTIFIER_POINTER (DECL_NAME (vars
[0])), "omp_out") == 0)
11348 error_at (loc
, "%<#pragma omp declare reduction%> combiner refers to "
11349 "variable %qD which is not %<omp_out%> nor %<omp_in%>",
11352 error_at (loc
, "%<#pragma omp declare reduction%> initializer refers "
11353 "to variable %qD which is not %<omp_priv%> nor "
11361 #include "gt-c-c-decl.h"