1 /* Process declarations and variables for C compiler.
2 Copyright (C) 1988-2015 Free Software Foundation, Inc.
4 This file is part of GCC.
6 GCC is free software; you can redistribute it and/or modify it under
7 the terms of the GNU General Public License as published by the Free
8 Software Foundation; either version 3, or (at your option) any later
11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 You should have received a copy of the GNU General Public License
17 along with GCC; see the file COPYING3. If not see
18 <http://www.gnu.org/licenses/>. */
20 /* Process declarations and symbol lookup for C front end.
21 Also constructs types; the standard scalar types at initialization,
22 and structure, union, array and enum types when they are declared. */
24 /* ??? not all decl nodes are given the most useful possible
25 line numbers. For example, the CONST_DECLs for enum values. */
29 #include "coretypes.h"
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"
55 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
57 { NORMAL
, /* Ordinary declaration */
58 FUNCDEF
, /* Function definition */
59 PARM
, /* Declaration of parm before function body */
60 FIELD
, /* Declaration inside struct or union */
61 TYPENAME
}; /* Typename (inside cast or sizeof) */
63 /* States indicating how grokdeclarator() should handle declspecs marked
64 with __attribute__((deprecated)). An object declared as
65 __attribute__((deprecated)) suppresses warnings of uses of other
68 enum deprecated_states
{
74 /* Nonzero if we have seen an invalid cross reference
75 to a struct, union, or enum, but not yet printed the message. */
76 tree pending_invalid_xref
;
78 /* File and line to appear in the eventual error message. */
79 location_t pending_invalid_xref_location
;
81 /* The file and line that the prototype came from if this is an
82 old-style definition; used for diagnostics in
83 store_parm_decls_oldstyle. */
85 static location_t current_function_prototype_locus
;
87 /* Whether this prototype was built-in. */
89 static bool current_function_prototype_built_in
;
91 /* The argument type information of this prototype. */
93 static tree current_function_prototype_arg_types
;
95 /* The argument information structure for the function currently being
98 static struct c_arg_info
*current_function_arg_info
;
100 /* The obstack on which parser and related data structures, which are
101 not live beyond their top-level declaration or definition, are
103 struct obstack parser_obstack
;
105 /* The current statement tree. */
107 static GTY(()) struct stmt_tree_s c_stmt_tree
;
109 /* State saving variables. */
113 /* A list of decls to be made automatically visible in each file scope. */
114 static GTY(()) tree visible_builtins
;
116 /* Set to 0 at beginning of a function definition, set to 1 if
117 a return statement that specifies a return value is seen. */
119 int current_function_returns_value
;
121 /* Set to 0 at beginning of a function definition, set to 1 if
122 a return statement with no argument is seen. */
124 int current_function_returns_null
;
126 /* Set to 0 at beginning of a function definition, set to 1 if
127 a call to a noreturn function is seen. */
129 int current_function_returns_abnormally
;
131 /* Set to nonzero by `grokdeclarator' for a function
132 whose return type is defaulted, if warnings for this are desired. */
134 static int warn_about_return_type
;
136 /* Nonzero when the current toplevel function contains a declaration
137 of a nested function which is never defined. */
139 static bool undef_nested_function
;
141 /* If non-zero, implicit "omp declare target" attribute is added into the
143 int current_omp_declare_target_attribute
;
145 /* Each c_binding structure describes one binding of an identifier to
146 a decl. All the decls in a scope - irrespective of namespace - are
147 chained together by the ->prev field, which (as the name implies)
148 runs in reverse order. All the decls in a given namespace bound to
149 a given identifier are chained by the ->shadowed field, which runs
150 from inner to outer scopes.
152 The ->decl field usually points to a DECL node, but there are two
153 exceptions. In the namespace of type tags, the bound entity is a
154 RECORD_TYPE, UNION_TYPE, or ENUMERAL_TYPE node. If an undeclared
155 identifier is encountered, it is bound to error_mark_node to
156 suppress further errors about that identifier in the current
159 The ->u.type field stores the type of the declaration in this scope;
160 if NULL, the type is the type of the ->decl field. This is only of
161 relevance for objects with external or internal linkage which may
162 be redeclared in inner scopes, forming composite types that only
163 persist for the duration of those scopes. In the external scope,
164 this stores the composite of all the types declared for this
165 object, visible or not. The ->inner_comp field (used only at file
166 scope) stores whether an incomplete array type at file scope was
167 completed at an inner scope to an array size other than 1.
169 The ->u.label field is used for labels. It points to a structure
170 which stores additional information used for warnings.
172 The depth field is copied from the scope structure that holds this
173 decl. It is used to preserve the proper ordering of the ->shadowed
174 field (see bind()) and also for a handful of special-case checks.
175 Finally, the invisible bit is true for a decl which should be
176 ignored for purposes of normal name lookup, and the nested bit is
177 true for a decl that's been bound a second time in an inner scope;
178 in all such cases, the binding in the outer scope will have its
179 invisible bit true. */
181 struct GTY((chain_next ("%h.prev"))) c_binding
{
182 union GTY(()) { /* first so GTY desc can use decl */
183 tree
GTY((tag ("0"))) type
; /* the type in this scope */
184 struct c_label_vars
* GTY((tag ("1"))) label
; /* for warnings */
185 } GTY((desc ("TREE_CODE (%0.decl) == LABEL_DECL"))) u
;
186 tree decl
; /* the decl bound */
187 tree id
; /* the identifier it's bound to */
188 struct c_binding
*prev
; /* the previous decl in this scope */
189 struct c_binding
*shadowed
; /* the innermost decl shadowed by this one */
190 unsigned int depth
: 28; /* depth of this scope */
191 BOOL_BITFIELD invisible
: 1; /* normal lookup should ignore this binding */
192 BOOL_BITFIELD nested
: 1; /* do not set DECL_CONTEXT when popping */
193 BOOL_BITFIELD inner_comp
: 1; /* incomplete array completed in inner scope */
194 BOOL_BITFIELD in_struct
: 1; /* currently defined as struct field */
195 location_t locus
; /* location for nested bindings */
197 #define B_IN_SCOPE(b1, b2) ((b1)->depth == (b2)->depth)
198 #define B_IN_CURRENT_SCOPE(b) ((b)->depth == current_scope->depth)
199 #define B_IN_FILE_SCOPE(b) ((b)->depth == 1 /*file_scope->depth*/)
200 #define B_IN_EXTERNAL_SCOPE(b) ((b)->depth == 0 /*external_scope->depth*/)
202 /* Each C symbol points to three linked lists of c_binding structures.
203 These describe the values of the identifier in the three different
204 namespaces defined by the language. */
206 struct GTY(()) lang_identifier
{
207 struct c_common_identifier common_id
;
208 struct c_binding
*symbol_binding
; /* vars, funcs, constants, typedefs */
209 struct c_binding
*tag_binding
; /* struct/union/enum tags */
210 struct c_binding
*label_binding
; /* labels */
213 /* Validate c-lang.c's assumptions. */
214 extern char C_SIZEOF_STRUCT_LANG_IDENTIFIER_isnt_accurate
215 [(sizeof(struct lang_identifier
) == C_SIZEOF_STRUCT_LANG_IDENTIFIER
) ? 1 : -1];
217 /* The binding oracle; see c-tree.h. */
218 void (*c_binding_oracle
) (enum c_oracle_request
, tree identifier
);
220 /* This flag is set on an identifier if we have previously asked the
221 binding oracle for this identifier's symbol binding. */
222 #define I_SYMBOL_CHECKED(node) \
223 (TREE_LANG_FLAG_4 (IDENTIFIER_NODE_CHECK (node)))
225 static inline struct c_binding
* *
226 i_symbol_binding (tree node
)
228 struct lang_identifier
*lid
229 = (struct lang_identifier
*) IDENTIFIER_NODE_CHECK (node
);
231 if (lid
->symbol_binding
== NULL
232 && c_binding_oracle
!= NULL
233 && !I_SYMBOL_CHECKED (node
))
235 /* Set the "checked" flag first, to avoid infinite recursion
236 when the binding oracle calls back into gcc. */
237 I_SYMBOL_CHECKED (node
) = 1;
238 c_binding_oracle (C_ORACLE_SYMBOL
, node
);
241 return &lid
->symbol_binding
;
244 #define I_SYMBOL_BINDING(node) (*i_symbol_binding (node))
246 #define I_SYMBOL_DECL(node) \
247 (I_SYMBOL_BINDING(node) ? I_SYMBOL_BINDING(node)->decl : 0)
249 /* This flag is set on an identifier if we have previously asked the
250 binding oracle for this identifier's tag binding. */
251 #define I_TAG_CHECKED(node) \
252 (TREE_LANG_FLAG_5 (IDENTIFIER_NODE_CHECK (node)))
254 static inline struct c_binding
**
255 i_tag_binding (tree node
)
257 struct lang_identifier
*lid
258 = (struct lang_identifier
*) IDENTIFIER_NODE_CHECK (node
);
260 if (lid
->tag_binding
== NULL
261 && c_binding_oracle
!= NULL
262 && !I_TAG_CHECKED (node
))
264 /* Set the "checked" flag first, to avoid infinite recursion
265 when the binding oracle calls back into gcc. */
266 I_TAG_CHECKED (node
) = 1;
267 c_binding_oracle (C_ORACLE_TAG
, node
);
270 return &lid
->tag_binding
;
273 #define I_TAG_BINDING(node) (*i_tag_binding (node))
275 #define I_TAG_DECL(node) \
276 (I_TAG_BINDING(node) ? I_TAG_BINDING(node)->decl : 0)
278 /* This flag is set on an identifier if we have previously asked the
279 binding oracle for this identifier's label binding. */
280 #define I_LABEL_CHECKED(node) \
281 (TREE_LANG_FLAG_6 (IDENTIFIER_NODE_CHECK (node)))
283 static inline struct c_binding
**
284 i_label_binding (tree node
)
286 struct lang_identifier
*lid
287 = (struct lang_identifier
*) IDENTIFIER_NODE_CHECK (node
);
289 if (lid
->label_binding
== NULL
290 && c_binding_oracle
!= NULL
291 && !I_LABEL_CHECKED (node
))
293 /* Set the "checked" flag first, to avoid infinite recursion
294 when the binding oracle calls back into gcc. */
295 I_LABEL_CHECKED (node
) = 1;
296 c_binding_oracle (C_ORACLE_LABEL
, node
);
299 return &lid
->label_binding
;
302 #define I_LABEL_BINDING(node) (*i_label_binding (node))
304 #define I_LABEL_DECL(node) \
305 (I_LABEL_BINDING(node) ? I_LABEL_BINDING(node)->decl : 0)
307 /* The resulting tree type. */
309 union GTY((desc ("TREE_CODE (&%h.generic) == IDENTIFIER_NODE"),
310 chain_next ("(union lang_tree_node *) c_tree_chain_next (&%h.generic)"))) lang_tree_node
312 union tree_node
GTY ((tag ("0"),
313 desc ("tree_node_structure (&%h)")))
315 struct lang_identifier
GTY ((tag ("1"))) identifier
;
318 /* Track bindings and other things that matter for goto warnings. For
319 efficiency, we do not gather all the decls at the point of
320 definition. Instead, we point into the bindings structure. As
321 scopes are popped, we update these structures and gather the decls
322 that matter at that time. */
324 struct GTY(()) c_spot_bindings
{
325 /* The currently open scope which holds bindings defined when the
326 label was defined or the goto statement was found. */
327 struct c_scope
*scope
;
328 /* The bindings in the scope field which were defined at the point
329 of the label or goto. This lets us look at older or newer
330 bindings in the scope, as appropriate. */
331 struct c_binding
*bindings_in_scope
;
332 /* The number of statement expressions that have started since this
333 label or goto statement was defined. This is zero if we are at
334 the same statement expression level. It is positive if we are in
335 a statement expression started since this spot. It is negative
336 if this spot was in a statement expression and we have left
339 /* Whether we started in a statement expression but are no longer in
340 it. This is set to true if stmt_exprs ever goes negative. */
344 /* This structure is used to keep track of bindings seen when a goto
345 statement is defined. This is only used if we see the goto
346 statement before we see the label. */
348 struct GTY(()) c_goto_bindings
{
349 /* The location of the goto statement. */
351 /* The bindings of the goto statement. */
352 struct c_spot_bindings goto_bindings
;
355 typedef struct c_goto_bindings
*c_goto_bindings_p
;
357 /* The additional information we keep track of for a label binding.
358 These fields are updated as scopes are popped. */
360 struct GTY(()) c_label_vars
{
361 /* The shadowed c_label_vars, when one label shadows another (which
362 can only happen using a __label__ declaration). */
363 struct c_label_vars
*shadowed
;
364 /* The bindings when the label was defined. */
365 struct c_spot_bindings label_bindings
;
366 /* A list of decls that we care about: decls about which we should
367 warn if a goto branches to this label from later in the function.
368 Decls are added to this list as scopes are popped. We only add
369 the decls that matter. */
370 vec
<tree
, va_gc
> *decls_in_scope
;
371 /* A list of goto statements to this label. This is only used for
372 goto statements seen before the label was defined, so that we can
373 issue appropriate warnings for them. */
374 vec
<c_goto_bindings_p
, va_gc
> *gotos
;
377 /* Each c_scope structure describes the complete contents of one
378 scope. Four scopes are distinguished specially: the innermost or
379 current scope, the innermost function scope, the file scope (always
380 the second to outermost) and the outermost or external scope.
382 Most declarations are recorded in the current scope.
384 All normal label declarations are recorded in the innermost
385 function scope, as are bindings of undeclared identifiers to
386 error_mark_node. (GCC permits nested functions as an extension,
387 hence the 'innermost' qualifier.) Explicitly declared labels
388 (using the __label__ extension) appear in the current scope.
390 Being in the file scope (current_scope == file_scope) causes
391 special behavior in several places below. Also, under some
392 conditions the Objective-C front end records declarations in the
393 file scope even though that isn't the current scope.
395 All declarations with external linkage are recorded in the external
396 scope, even if they aren't visible there; this models the fact that
397 such declarations are visible to the entire program, and (with a
398 bit of cleverness, see pushdecl) allows diagnosis of some violations
399 of C99 6.2.2p7 and 6.2.7p2:
401 If, within the same translation unit, the same identifier appears
402 with both internal and external linkage, the behavior is
405 All declarations that refer to the same object or function shall
406 have compatible type; otherwise, the behavior is undefined.
408 Initially only the built-in declarations, which describe compiler
409 intrinsic functions plus a subset of the standard library, are in
412 The order of the blocks list matters, and it is frequently appended
413 to. To avoid having to walk all the way to the end of the list on
414 each insertion, or reverse the list later, we maintain a pointer to
415 the last list entry. (FIXME: It should be feasible to use a reversed
418 The bindings list is strictly in reverse order of declarations;
419 pop_scope relies on this. */
422 struct GTY((chain_next ("%h.outer"))) c_scope
{
423 /* The scope containing this one. */
424 struct c_scope
*outer
;
426 /* The next outermost function scope. */
427 struct c_scope
*outer_function
;
429 /* All bindings in this scope. */
430 struct c_binding
*bindings
;
432 /* For each scope (except the global one), a chain of BLOCK nodes
433 for all the scopes that were entered and exited one level down. */
437 /* The depth of this scope. Used to keep the ->shadowed chain of
438 bindings sorted innermost to outermost. */
439 unsigned int depth
: 28;
441 /* True if we are currently filling this scope with parameter
443 BOOL_BITFIELD parm_flag
: 1;
445 /* True if we saw [*] in this scope. Used to give an error messages
446 if these appears in a function definition. */
447 BOOL_BITFIELD had_vla_unspec
: 1;
449 /* True if we already complained about forward parameter decls
450 in this scope. This prevents double warnings on
451 foo (int a; int b; ...) */
452 BOOL_BITFIELD warned_forward_parm_decls
: 1;
454 /* True if this is the outermost block scope of a function body.
455 This scope contains the parameters, the local variables declared
456 in the outermost block, and all the labels (except those in
457 nested functions, or declared at block scope with __label__). */
458 BOOL_BITFIELD function_body
: 1;
460 /* True means make a BLOCK for this scope no matter what. */
461 BOOL_BITFIELD keep
: 1;
463 /* True means that an unsuffixed float constant is _Decimal64. */
464 BOOL_BITFIELD float_const_decimal64
: 1;
466 /* True if this scope has any label bindings. This is used to speed
467 up searching for labels when popping scopes, particularly since
468 labels are normally only found at function scope. */
469 BOOL_BITFIELD has_label_bindings
: 1;
471 /* True if we should issue a warning if a goto statement crosses any
472 of the bindings. We still need to check the list of bindings to
473 find the specific ones we need to warn about. This is true if
474 decl_jump_unsafe would return true for any of the bindings. This
475 is used to avoid looping over all the bindings unnecessarily. */
476 BOOL_BITFIELD has_jump_unsafe_decl
: 1;
479 /* The scope currently in effect. */
481 static GTY(()) struct c_scope
*current_scope
;
483 /* The innermost function scope. Ordinary (not explicitly declared)
484 labels, bindings to error_mark_node, and the lazily-created
485 bindings of __func__ and its friends get this scope. */
487 static GTY(()) struct c_scope
*current_function_scope
;
489 /* The C file scope. This is reset for each input translation unit. */
491 static GTY(()) struct c_scope
*file_scope
;
493 /* The outermost scope. This is used for all declarations with
494 external linkage, and only these, hence the name. */
496 static GTY(()) struct c_scope
*external_scope
;
498 /* A chain of c_scope structures awaiting reuse. */
500 static GTY((deletable
)) struct c_scope
*scope_freelist
;
502 /* A chain of c_binding structures awaiting reuse. */
504 static GTY((deletable
)) struct c_binding
*binding_freelist
;
506 /* Append VAR to LIST in scope SCOPE. */
507 #define SCOPE_LIST_APPEND(scope, list, decl) do { \
508 struct c_scope *s_ = (scope); \
510 if (s_->list##_last) \
511 BLOCK_CHAIN (s_->list##_last) = d_; \
514 s_->list##_last = d_; \
517 /* Concatenate FROM in scope FSCOPE onto TO in scope TSCOPE. */
518 #define SCOPE_LIST_CONCAT(tscope, to, fscope, from) do { \
519 struct c_scope *t_ = (tscope); \
520 struct c_scope *f_ = (fscope); \
522 BLOCK_CHAIN (t_->to##_last) = f_->from; \
525 t_->to##_last = f_->from##_last; \
528 /* A c_inline_static structure stores details of a static identifier
529 referenced in a definition of a function that may be an inline
530 definition if no subsequent declaration of that function uses
531 "extern" or does not use "inline". */
533 struct GTY((chain_next ("%h.next"))) c_inline_static
{
534 /* The location for a diagnostic. */
537 /* The function that may be an inline definition. */
540 /* The object or function referenced. */
543 /* What sort of reference this is. */
544 enum c_inline_static_type type
;
546 /* The next such structure or NULL. */
547 struct c_inline_static
*next
;
550 /* List of static identifiers used or referenced in functions that may
551 be inline definitions. */
552 static GTY(()) struct c_inline_static
*c_inline_statics
;
554 /* True means unconditionally make a BLOCK for the next scope pushed. */
556 static bool keep_next_level_flag
;
558 /* True means the next call to push_scope will be the outermost scope
559 of a function body, so do not push a new scope, merely cease
560 expecting parameter decls. */
562 static bool next_is_function_body
;
564 /* A vector of pointers to c_binding structures. */
566 typedef struct c_binding
*c_binding_ptr
;
568 /* Information that we keep for a struct or union while it is being
571 struct c_struct_parse_info
573 /* If warn_cxx_compat, a list of types defined within this
575 vec
<tree
> struct_types
;
576 /* If warn_cxx_compat, a list of field names which have bindings,
577 and which are defined in this struct, but which are not defined
578 in any enclosing struct. This is used to clear the in_struct
579 field of the c_bindings structure. */
580 vec
<c_binding_ptr
> fields
;
581 /* If warn_cxx_compat, a list of typedef names used when defining
582 fields in this struct. */
583 vec
<tree
> typedefs_seen
;
586 /* Information for the struct or union currently being parsed, or
587 NULL if not parsing a struct or union. */
588 static struct c_struct_parse_info
*struct_parse_info
;
590 /* Forward declarations. */
591 static tree
lookup_name_in_scope (tree
, struct c_scope
*);
592 static tree
c_make_fname_decl (location_t
, tree
, int);
593 static tree
grokdeclarator (const struct c_declarator
*,
594 struct c_declspecs
*,
595 enum decl_context
, bool, tree
*, tree
*, tree
*,
596 bool *, enum deprecated_states
);
597 static tree
grokparms (struct c_arg_info
*, bool);
598 static void layout_array_type (tree
);
599 static void warn_defaults_to (location_t
, int, const char *, ...)
600 ATTRIBUTE_GCC_DIAG(3,4);
602 /* T is a statement. Add it to the statement-tree. This is the
603 C/ObjC version--C++ has a slightly different version of this
609 enum tree_code code
= TREE_CODE (t
);
611 if (CAN_HAVE_LOCATION_P (t
) && code
!= LABEL_EXPR
)
613 if (!EXPR_HAS_LOCATION (t
))
614 SET_EXPR_LOCATION (t
, input_location
);
617 if (code
== LABEL_EXPR
|| code
== CASE_LABEL_EXPR
)
618 STATEMENT_LIST_HAS_LABEL (cur_stmt_list
) = 1;
620 /* Add T to the statement-tree. Non-side-effect statements need to be
621 recorded during statement expressions. */
622 if (!building_stmt_list_p ())
624 append_to_statement_list_force (t
, &cur_stmt_list
);
629 /* Build a pointer type using the default pointer mode. */
632 c_build_pointer_type (tree to_type
)
634 addr_space_t as
= to_type
== error_mark_node
? ADDR_SPACE_GENERIC
635 : TYPE_ADDR_SPACE (to_type
);
636 machine_mode pointer_mode
;
638 if (as
!= ADDR_SPACE_GENERIC
|| c_default_pointer_mode
== VOIDmode
)
639 pointer_mode
= targetm
.addr_space
.pointer_mode (as
);
641 pointer_mode
= c_default_pointer_mode
;
642 return build_pointer_type_for_mode (to_type
, pointer_mode
, false);
646 /* Return true if we will want to say something if a goto statement
650 decl_jump_unsafe (tree decl
)
652 if (error_operand_p (decl
))
655 /* Always warn about crossing variably modified types. */
656 if ((VAR_P (decl
) || TREE_CODE (decl
) == TYPE_DECL
)
657 && variably_modified_type_p (TREE_TYPE (decl
), NULL_TREE
))
660 /* Otherwise, only warn if -Wgoto-misses-init and this is an
661 initialized automatic decl. */
662 if (warn_jump_misses_init
664 && !TREE_STATIC (decl
)
665 && DECL_INITIAL (decl
) != NULL_TREE
)
673 c_print_identifier (FILE *file
, tree node
, int indent
)
675 void (*save
) (enum c_oracle_request
, tree identifier
);
677 /* Temporarily hide any binding oracle. Without this, calls to
678 debug_tree from the debugger will end up calling into the oracle,
679 making for a confusing debug session. As the oracle isn't needed
680 here for normal operation, it's simplest to suppress it. */
681 save
= c_binding_oracle
;
682 c_binding_oracle
= NULL
;
684 print_node (file
, "symbol", I_SYMBOL_DECL (node
), indent
+ 4);
685 print_node (file
, "tag", I_TAG_DECL (node
), indent
+ 4);
686 print_node (file
, "label", I_LABEL_DECL (node
), indent
+ 4);
687 if (C_IS_RESERVED_WORD (node
) && C_RID_CODE (node
) != RID_CXX_COMPAT_WARN
)
689 tree rid
= ridpointers
[C_RID_CODE (node
)];
690 indent_to (file
, indent
+ 4);
691 fprintf (file
, "rid " HOST_PTR_PRINTF
" \"%s\"",
692 (void *) rid
, IDENTIFIER_POINTER (rid
));
695 c_binding_oracle
= save
;
698 /* Establish a binding between NAME, an IDENTIFIER_NODE, and DECL,
699 which may be any of several kinds of DECL or TYPE or error_mark_node,
700 in the scope SCOPE. */
702 bind (tree name
, tree decl
, struct c_scope
*scope
, bool invisible
,
703 bool nested
, location_t locus
)
705 struct c_binding
*b
, **here
;
707 if (binding_freelist
)
709 b
= binding_freelist
;
710 binding_freelist
= b
->prev
;
713 b
= ggc_alloc
<c_binding
> ();
718 b
->depth
= scope
->depth
;
719 b
->invisible
= invisible
;
727 b
->prev
= scope
->bindings
;
730 if (decl_jump_unsafe (decl
))
731 scope
->has_jump_unsafe_decl
= 1;
736 switch (TREE_CODE (decl
))
738 case LABEL_DECL
: here
= &I_LABEL_BINDING (name
); break;
741 case RECORD_TYPE
: here
= &I_TAG_BINDING (name
); break;
747 case ERROR_MARK
: here
= &I_SYMBOL_BINDING (name
); break;
753 /* Locate the appropriate place in the chain of shadowed decls
754 to insert this binding. Normally, scope == current_scope and
755 this does nothing. */
756 while (*here
&& (*here
)->depth
> scope
->depth
)
757 here
= &(*here
)->shadowed
;
763 /* Clear the binding structure B, stick it on the binding_freelist,
764 and return the former value of b->prev. This is used by pop_scope
765 and get_parm_info to iterate destructively over all the bindings
766 from a given scope. */
767 static struct c_binding
*
768 free_binding_and_advance (struct c_binding
*b
)
770 struct c_binding
*prev
= b
->prev
;
772 memset (b
, 0, sizeof (struct c_binding
));
773 b
->prev
= binding_freelist
;
774 binding_freelist
= b
;
779 /* Bind a label. Like bind, but skip fields which aren't used for
780 labels, and add the LABEL_VARS value. */
782 bind_label (tree name
, tree label
, struct c_scope
*scope
,
783 struct c_label_vars
*label_vars
)
787 bind (name
, label
, scope
, /*invisible=*/false, /*nested=*/false,
790 scope
->has_label_bindings
= true;
793 gcc_assert (b
->decl
== label
);
794 label_vars
->shadowed
= b
->u
.label
;
795 b
->u
.label
= label_vars
;
798 /* Hook called at end of compilation to assume 1 elt
799 for a file-scope tentative array defn that wasn't complete before. */
802 c_finish_incomplete_decl (tree decl
)
806 tree type
= TREE_TYPE (decl
);
807 if (type
!= error_mark_node
808 && TREE_CODE (type
) == ARRAY_TYPE
809 && !DECL_EXTERNAL (decl
)
810 && TYPE_DOMAIN (type
) == 0)
812 warning_at (DECL_SOURCE_LOCATION (decl
),
813 0, "array %q+D assumed to have one element", decl
);
815 complete_array_type (&TREE_TYPE (decl
), NULL_TREE
, true);
817 relayout_decl (decl
);
822 /* Record that inline function FUNC contains a reference (location
823 LOC) to static DECL (file-scope or function-local according to
827 record_inline_static (location_t loc
, tree func
, tree decl
,
828 enum c_inline_static_type type
)
830 c_inline_static
*csi
= ggc_alloc
<c_inline_static
> ();
832 csi
->function
= func
;
833 csi
->static_decl
= decl
;
835 csi
->next
= c_inline_statics
;
836 c_inline_statics
= csi
;
839 /* Check for references to static declarations in inline functions at
840 the end of the translation unit and diagnose them if the functions
841 are still inline definitions. */
844 check_inline_statics (void)
846 struct c_inline_static
*csi
;
847 for (csi
= c_inline_statics
; csi
; csi
= csi
->next
)
849 if (DECL_EXTERNAL (csi
->function
))
853 pedwarn (csi
->location
, 0,
854 "%qD is static but used in inline function %qD "
855 "which is not static", csi
->static_decl
, csi
->function
);
858 pedwarn (csi
->location
, 0,
859 "%q+D is static but declared in inline function %qD "
860 "which is not static", csi
->static_decl
, csi
->function
);
866 c_inline_statics
= NULL
;
869 /* Fill in a c_spot_bindings structure. If DEFINING is true, set it
870 for the current state, otherwise set it to uninitialized. */
873 set_spot_bindings (struct c_spot_bindings
*p
, bool defining
)
877 p
->scope
= current_scope
;
878 p
->bindings_in_scope
= current_scope
->bindings
;
883 p
->bindings_in_scope
= NULL
;
886 p
->left_stmt_expr
= false;
889 /* Update spot bindings P as we pop out of SCOPE. Return true if we
890 should push decls for a label. */
893 update_spot_bindings (struct c_scope
*scope
, struct c_spot_bindings
*p
)
895 if (p
->scope
!= scope
)
897 /* This label or goto is defined in some other scope, or it is a
898 label which is not yet defined. There is nothing to
903 /* Adjust the spot bindings to refer to the bindings already defined
904 in the enclosing scope. */
905 p
->scope
= scope
->outer
;
906 p
->bindings_in_scope
= p
->scope
->bindings
;
911 /* The Objective-C front-end often needs to determine the current scope. */
914 objc_get_current_scope (void)
916 return current_scope
;
919 /* The following function is used only by Objective-C. It needs to live here
920 because it accesses the innards of c_scope. */
923 objc_mark_locals_volatile (void *enclosing_blk
)
925 struct c_scope
*scope
;
928 for (scope
= current_scope
;
929 scope
&& scope
!= enclosing_blk
;
930 scope
= scope
->outer
)
932 for (b
= scope
->bindings
; b
; b
= b
->prev
)
933 objc_volatilize_decl (b
->decl
);
935 /* Do not climb up past the current function. */
936 if (scope
->function_body
)
941 /* Return true if we are in the global binding level. */
944 global_bindings_p (void)
946 return current_scope
== file_scope
;
950 keep_next_level (void)
952 keep_next_level_flag
= true;
955 /* Set the flag for the FLOAT_CONST_DECIMAL64 pragma being ON. */
958 set_float_const_decimal64 (void)
960 current_scope
->float_const_decimal64
= true;
963 /* Clear the flag for the FLOAT_CONST_DECIMAL64 pragma. */
966 clear_float_const_decimal64 (void)
968 current_scope
->float_const_decimal64
= false;
971 /* Return nonzero if an unsuffixed float constant is _Decimal64. */
974 float_const_decimal64_p (void)
976 return current_scope
->float_const_decimal64
;
979 /* Identify this scope as currently being filled with parameters. */
982 declare_parm_level (void)
984 current_scope
->parm_flag
= true;
990 if (next_is_function_body
)
992 /* This is the transition from the parameters to the top level
993 of the function body. These are the same scope
994 (C99 6.2.1p4,6) so we do not push another scope structure.
995 next_is_function_body is set only by store_parm_decls, which
996 in turn is called when and only when we are about to
997 encounter the opening curly brace for the function body.
999 The outermost block of a function always gets a BLOCK node,
1000 because the debugging output routines expect that each
1001 function has at least one BLOCK. */
1002 current_scope
->parm_flag
= false;
1003 current_scope
->function_body
= true;
1004 current_scope
->keep
= true;
1005 current_scope
->outer_function
= current_function_scope
;
1006 current_function_scope
= current_scope
;
1008 keep_next_level_flag
= false;
1009 next_is_function_body
= false;
1011 /* The FLOAT_CONST_DECIMAL64 pragma applies to nested scopes. */
1012 if (current_scope
->outer
)
1013 current_scope
->float_const_decimal64
1014 = current_scope
->outer
->float_const_decimal64
;
1016 current_scope
->float_const_decimal64
= false;
1020 struct c_scope
*scope
;
1023 scope
= scope_freelist
;
1024 scope_freelist
= scope
->outer
;
1027 scope
= ggc_cleared_alloc
<c_scope
> ();
1029 /* The FLOAT_CONST_DECIMAL64 pragma applies to nested scopes. */
1031 scope
->float_const_decimal64
= current_scope
->float_const_decimal64
;
1033 scope
->float_const_decimal64
= false;
1035 scope
->keep
= keep_next_level_flag
;
1036 scope
->outer
= current_scope
;
1037 scope
->depth
= current_scope
? (current_scope
->depth
+ 1) : 0;
1039 /* Check for scope depth overflow. Unlikely (2^28 == 268,435,456) but
1041 if (current_scope
&& scope
->depth
== 0)
1044 sorry ("GCC supports only %u nested scopes", scope
->depth
);
1047 current_scope
= scope
;
1048 keep_next_level_flag
= false;
1052 /* This is called when we are leaving SCOPE. For each label defined
1053 in SCOPE, add any appropriate decls to its decls_in_scope fields.
1054 These are the decls whose initialization will be skipped by a goto
1055 later in the function. */
1058 update_label_decls (struct c_scope
*scope
)
1065 if (s
->has_label_bindings
)
1067 struct c_binding
*b
;
1069 for (b
= s
->bindings
; b
!= NULL
; b
= b
->prev
)
1071 struct c_label_vars
*label_vars
;
1072 struct c_binding
*b1
;
1075 struct c_goto_bindings
*g
;
1077 if (TREE_CODE (b
->decl
) != LABEL_DECL
)
1079 label_vars
= b
->u
.label
;
1081 b1
= label_vars
->label_bindings
.bindings_in_scope
;
1082 if (label_vars
->label_bindings
.scope
== NULL
)
1085 hjud
= label_vars
->label_bindings
.scope
->has_jump_unsafe_decl
;
1086 if (update_spot_bindings (scope
, &label_vars
->label_bindings
))
1088 /* This label is defined in this scope. */
1091 for (; b1
!= NULL
; b1
= b1
->prev
)
1093 /* A goto from later in the function to this
1094 label will never see the initialization
1095 of B1, if any. Save it to issue a
1096 warning if needed. */
1097 if (decl_jump_unsafe (b1
->decl
))
1098 vec_safe_push(label_vars
->decls_in_scope
, b1
->decl
);
1103 /* Update the bindings of any goto statements associated
1105 FOR_EACH_VEC_SAFE_ELT (label_vars
->gotos
, ix
, g
)
1106 update_spot_bindings (scope
, &g
->goto_bindings
);
1110 /* Don't search beyond the current function. */
1111 if (s
== current_function_scope
)
1118 /* Set the TYPE_CONTEXT of all of TYPE's variants to CONTEXT. */
1121 set_type_context (tree type
, tree context
)
1123 for (type
= TYPE_MAIN_VARIANT (type
); type
;
1124 type
= TYPE_NEXT_VARIANT (type
))
1125 TYPE_CONTEXT (type
) = context
;
1128 /* Exit a scope. Restore the state of the identifier-decl mappings
1129 that were in effect when this scope was entered. Return a BLOCK
1130 node containing all the DECLs in this scope that are of interest
1131 to debug info generation. */
1136 struct c_scope
*scope
= current_scope
;
1137 tree block
, context
, p
;
1138 struct c_binding
*b
;
1140 bool functionbody
= scope
->function_body
;
1141 bool keep
= functionbody
|| scope
->keep
|| scope
->bindings
;
1143 update_label_decls (scope
);
1145 /* If appropriate, create a BLOCK to record the decls for the life
1146 of this function. */
1150 block
= make_node (BLOCK
);
1151 BLOCK_SUBBLOCKS (block
) = scope
->blocks
;
1152 TREE_USED (block
) = 1;
1154 /* In each subblock, record that this is its superior. */
1155 for (p
= scope
->blocks
; p
; p
= BLOCK_CHAIN (p
))
1156 BLOCK_SUPERCONTEXT (p
) = block
;
1158 BLOCK_VARS (block
) = 0;
1161 /* The TYPE_CONTEXTs for all of the tagged types belonging to this
1162 scope must be set so that they point to the appropriate
1163 construct, i.e. either to the current FUNCTION_DECL node, or
1164 else to the BLOCK node we just constructed.
1166 Note that for tagged types whose scope is just the formal
1167 parameter list for some function type specification, we can't
1168 properly set their TYPE_CONTEXTs here, because we don't have a
1169 pointer to the appropriate FUNCTION_TYPE node readily available
1170 to us. For those cases, the TYPE_CONTEXTs of the relevant tagged
1171 type nodes get set in `grokdeclarator' as soon as we have created
1172 the FUNCTION_TYPE node which will represent the "scope" for these
1173 "parameter list local" tagged types. */
1174 if (scope
->function_body
)
1175 context
= current_function_decl
;
1176 else if (scope
== file_scope
)
1178 tree file_decl
= build_translation_unit_decl (NULL_TREE
);
1179 context
= file_decl
;
1180 debug_hooks
->register_main_translation_unit (file_decl
);
1185 /* Clear all bindings in this scope. */
1186 for (b
= scope
->bindings
; b
; b
= free_binding_and_advance (b
))
1189 switch (TREE_CODE (p
))
1192 /* Warnings for unused labels, errors for undefined labels. */
1193 if (TREE_USED (p
) && !DECL_INITIAL (p
))
1195 error ("label %q+D used but not defined", p
);
1196 DECL_INITIAL (p
) = error_mark_node
;
1199 warn_for_unused_label (p
);
1201 /* Labels go in BLOCK_VARS. */
1202 DECL_CHAIN (p
) = BLOCK_VARS (block
);
1203 BLOCK_VARS (block
) = p
;
1204 gcc_assert (I_LABEL_BINDING (b
->id
) == b
);
1205 I_LABEL_BINDING (b
->id
) = b
->shadowed
;
1207 /* Also pop back to the shadowed label_vars. */
1208 release_tree_vector (b
->u
.label
->decls_in_scope
);
1209 b
->u
.label
= b
->u
.label
->shadowed
;
1215 set_type_context (p
, context
);
1217 /* Types may not have tag-names, in which case the type
1218 appears in the bindings list with b->id NULL. */
1221 gcc_assert (I_TAG_BINDING (b
->id
) == b
);
1222 I_TAG_BINDING (b
->id
) = b
->shadowed
;
1227 /* Propagate TREE_ADDRESSABLE from nested functions to their
1228 containing functions. */
1229 if (!TREE_ASM_WRITTEN (p
)
1230 && DECL_INITIAL (p
) != 0
1231 && TREE_ADDRESSABLE (p
)
1232 && DECL_ABSTRACT_ORIGIN (p
) != 0
1233 && DECL_ABSTRACT_ORIGIN (p
) != p
)
1234 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (p
)) = 1;
1235 if (!DECL_EXTERNAL (p
)
1236 && !DECL_INITIAL (p
)
1237 && scope
!= file_scope
1238 && scope
!= external_scope
)
1240 error ("nested function %q+D declared but never defined", p
);
1241 undef_nested_function
= true;
1243 else if (DECL_DECLARED_INLINE_P (p
)
1245 && !DECL_INITIAL (p
))
1247 /* C99 6.7.4p6: "a function with external linkage... declared
1248 with an inline function specifier ... shall also be defined
1249 in the same translation unit." */
1250 if (!flag_gnu89_inline
1251 && !lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (p
))
1252 && scope
!= external_scope
)
1253 pedwarn (input_location
, 0,
1254 "inline function %q+D declared but never defined", p
);
1255 DECL_EXTERNAL (p
) = 1;
1261 /* Warnings for unused variables. */
1262 if ((!TREE_USED (p
) || !DECL_READ_P (p
))
1263 && !TREE_NO_WARNING (p
)
1264 && !DECL_IN_SYSTEM_HEADER (p
)
1266 && !DECL_ARTIFICIAL (p
)
1267 && scope
!= file_scope
1268 && scope
!= external_scope
)
1271 warning (OPT_Wunused_variable
, "unused variable %q+D", p
);
1272 else if (DECL_CONTEXT (p
) == current_function_decl
)
1273 warning_at (DECL_SOURCE_LOCATION (p
),
1274 OPT_Wunused_but_set_variable
,
1275 "variable %qD set but not used", p
);
1280 error ("type of array %q+D completed incompatibly with"
1281 " implicit initialization", p
);
1288 /* All of these go in BLOCK_VARS, but only if this is the
1289 binding in the home scope. */
1292 DECL_CHAIN (p
) = BLOCK_VARS (block
);
1293 BLOCK_VARS (block
) = p
;
1295 else if (VAR_OR_FUNCTION_DECL_P (p
) && scope
!= file_scope
)
1297 /* For block local externs add a special
1298 DECL_EXTERNAL decl for debug info generation. */
1299 tree extp
= copy_node (p
);
1301 DECL_EXTERNAL (extp
) = 1;
1302 TREE_STATIC (extp
) = 0;
1303 TREE_PUBLIC (extp
) = 1;
1304 DECL_INITIAL (extp
) = NULL_TREE
;
1305 DECL_LANG_SPECIFIC (extp
) = NULL
;
1306 DECL_CONTEXT (extp
) = current_function_decl
;
1307 if (TREE_CODE (p
) == FUNCTION_DECL
)
1309 DECL_RESULT (extp
) = NULL_TREE
;
1310 DECL_SAVED_TREE (extp
) = NULL_TREE
;
1311 DECL_STRUCT_FUNCTION (extp
) = NULL
;
1313 if (b
->locus
!= UNKNOWN_LOCATION
)
1314 DECL_SOURCE_LOCATION (extp
) = b
->locus
;
1315 DECL_CHAIN (extp
) = BLOCK_VARS (block
);
1316 BLOCK_VARS (block
) = extp
;
1318 /* If this is the file scope set DECL_CONTEXT of each decl to
1319 the TRANSLATION_UNIT_DECL. This makes same_translation_unit_p
1321 if (scope
== file_scope
)
1323 DECL_CONTEXT (p
) = context
;
1324 if (TREE_CODE (p
) == TYPE_DECL
1325 && TREE_TYPE (p
) != error_mark_node
)
1326 set_type_context (TREE_TYPE (p
), context
);
1330 /* Parameters go in DECL_ARGUMENTS, not BLOCK_VARS, and have
1331 already been put there by store_parm_decls. Unused-
1332 parameter warnings are handled by function.c.
1333 error_mark_node obviously does not go in BLOCK_VARS and
1334 does not get unused-variable warnings. */
1337 /* It is possible for a decl not to have a name. We get
1338 here with b->id NULL in this case. */
1341 gcc_assert (I_SYMBOL_BINDING (b
->id
) == b
);
1342 I_SYMBOL_BINDING (b
->id
) = b
->shadowed
;
1343 if (b
->shadowed
&& b
->shadowed
->u
.type
)
1344 TREE_TYPE (b
->shadowed
->decl
) = b
->shadowed
->u
.type
;
1354 /* Dispose of the block that we just made inside some higher level. */
1355 if ((scope
->function_body
|| scope
== file_scope
) && context
)
1357 DECL_INITIAL (context
) = block
;
1358 BLOCK_SUPERCONTEXT (block
) = context
;
1360 else if (scope
->outer
)
1363 SCOPE_LIST_APPEND (scope
->outer
, blocks
, block
);
1364 /* If we did not make a block for the scope just exited, any
1365 blocks made for inner scopes must be carried forward so they
1366 will later become subblocks of something else. */
1367 else if (scope
->blocks
)
1368 SCOPE_LIST_CONCAT (scope
->outer
, blocks
, scope
, blocks
);
1371 /* Pop the current scope, and free the structure for reuse. */
1372 current_scope
= scope
->outer
;
1373 if (scope
->function_body
)
1374 current_function_scope
= scope
->outer_function
;
1376 memset (scope
, 0, sizeof (struct c_scope
));
1377 scope
->outer
= scope_freelist
;
1378 scope_freelist
= scope
;
1384 push_file_scope (void)
1392 file_scope
= current_scope
;
1394 start_fname_decls ();
1396 for (decl
= visible_builtins
; decl
; decl
= DECL_CHAIN (decl
))
1397 bind (DECL_NAME (decl
), decl
, file_scope
,
1398 /*invisible=*/false, /*nested=*/true, DECL_SOURCE_LOCATION (decl
));
1402 pop_file_scope (void)
1404 /* In case there were missing closebraces, get us back to the global
1406 while (current_scope
!= file_scope
)
1409 /* __FUNCTION__ is defined at file scope (""). This
1410 call may not be necessary as my tests indicate it
1411 still works without it. */
1412 finish_fname_decls ();
1414 check_inline_statics ();
1416 /* This is the point to write out a PCH if we're doing that.
1417 In that case we do not want to do anything else. */
1420 c_common_write_pch ();
1424 /* Pop off the file scope and close this translation unit. */
1428 maybe_apply_pending_pragma_weaks ();
1431 /* Adjust the bindings for the start of a statement expression. */
1434 c_bindings_start_stmt_expr (struct c_spot_bindings
* switch_bindings
)
1436 struct c_scope
*scope
;
1438 for (scope
= current_scope
; scope
!= NULL
; scope
= scope
->outer
)
1440 struct c_binding
*b
;
1442 if (!scope
->has_label_bindings
)
1445 for (b
= scope
->bindings
; b
!= NULL
; b
= b
->prev
)
1447 struct c_label_vars
*label_vars
;
1449 struct c_goto_bindings
*g
;
1451 if (TREE_CODE (b
->decl
) != LABEL_DECL
)
1453 label_vars
= b
->u
.label
;
1454 ++label_vars
->label_bindings
.stmt_exprs
;
1455 FOR_EACH_VEC_SAFE_ELT (label_vars
->gotos
, ix
, g
)
1456 ++g
->goto_bindings
.stmt_exprs
;
1460 if (switch_bindings
!= NULL
)
1461 ++switch_bindings
->stmt_exprs
;
1464 /* Adjust the bindings for the end of a statement expression. */
1467 c_bindings_end_stmt_expr (struct c_spot_bindings
*switch_bindings
)
1469 struct c_scope
*scope
;
1471 for (scope
= current_scope
; scope
!= NULL
; scope
= scope
->outer
)
1473 struct c_binding
*b
;
1475 if (!scope
->has_label_bindings
)
1478 for (b
= scope
->bindings
; b
!= NULL
; b
= b
->prev
)
1480 struct c_label_vars
*label_vars
;
1482 struct c_goto_bindings
*g
;
1484 if (TREE_CODE (b
->decl
) != LABEL_DECL
)
1486 label_vars
= b
->u
.label
;
1487 --label_vars
->label_bindings
.stmt_exprs
;
1488 if (label_vars
->label_bindings
.stmt_exprs
< 0)
1490 label_vars
->label_bindings
.left_stmt_expr
= true;
1491 label_vars
->label_bindings
.stmt_exprs
= 0;
1493 FOR_EACH_VEC_SAFE_ELT (label_vars
->gotos
, ix
, g
)
1495 --g
->goto_bindings
.stmt_exprs
;
1496 if (g
->goto_bindings
.stmt_exprs
< 0)
1498 g
->goto_bindings
.left_stmt_expr
= true;
1499 g
->goto_bindings
.stmt_exprs
= 0;
1505 if (switch_bindings
!= NULL
)
1507 --switch_bindings
->stmt_exprs
;
1508 gcc_assert (switch_bindings
->stmt_exprs
>= 0);
1512 /* Push a definition or a declaration of struct, union or enum tag "name".
1513 "type" should be the type node.
1514 We assume that the tag "name" is not already defined, and has a location
1517 Note that the definition may really be just a forward reference.
1518 In that case, the TYPE_SIZE will be zero. */
1521 pushtag (location_t loc
, tree name
, tree type
)
1523 /* Record the identifier as the type's name if it has none. */
1524 if (name
&& !TYPE_NAME (type
))
1525 TYPE_NAME (type
) = name
;
1526 bind (name
, type
, current_scope
, /*invisible=*/false, /*nested=*/false, loc
);
1528 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1529 tagged type we just added to the current scope. This fake
1530 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1531 to output a representation of a tagged type, and it also gives
1532 us a convenient place to record the "scope start" address for the
1535 TYPE_STUB_DECL (type
) = pushdecl (build_decl (loc
,
1536 TYPE_DECL
, NULL_TREE
, type
));
1538 /* An approximation for now, so we can tell this is a function-scope tag.
1539 This will be updated in pop_scope. */
1540 TYPE_CONTEXT (type
) = DECL_CONTEXT (TYPE_STUB_DECL (type
));
1542 if (warn_cxx_compat
&& name
!= NULL_TREE
)
1544 struct c_binding
*b
= I_SYMBOL_BINDING (name
);
1547 && b
->decl
!= NULL_TREE
1548 && TREE_CODE (b
->decl
) == TYPE_DECL
1549 && (B_IN_CURRENT_SCOPE (b
)
1550 || (current_scope
== file_scope
&& B_IN_EXTERNAL_SCOPE (b
)))
1551 && (TYPE_MAIN_VARIANT (TREE_TYPE (b
->decl
))
1552 != TYPE_MAIN_VARIANT (type
)))
1554 warning_at (loc
, OPT_Wc___compat
,
1555 ("using %qD as both a typedef and a tag is "
1558 if (b
->locus
!= UNKNOWN_LOCATION
)
1559 inform (b
->locus
, "originally defined here");
1564 /* An exported interface to pushtag. This is used by the gdb plugin's
1565 binding oracle to introduce a new tag binding. */
1568 c_pushtag (location_t loc
, tree name
, tree type
)
1570 pushtag (loc
, name
, type
);
1573 /* An exported interface to bind a declaration. LOC is the location
1574 to use. DECL is the declaration to bind. The decl's name is used
1575 to determine how it is bound. If DECL is a VAR_DECL, then
1576 IS_GLOBAL determines whether the decl is put into the global (file
1577 and external) scope or the current function's scope; if DECL is not
1578 a VAR_DECL then it is always put into the file scope. */
1581 c_bind (location_t loc
, tree decl
, bool is_global
)
1583 struct c_scope
*scope
;
1584 bool nested
= false;
1586 if (!VAR_P (decl
) || current_function_scope
== NULL
)
1588 /* Types and functions are always considered to be global. */
1590 DECL_EXTERNAL (decl
) = 1;
1591 TREE_PUBLIC (decl
) = 1;
1595 /* Also bind it into the external scope. */
1596 bind (DECL_NAME (decl
), decl
, external_scope
, true, false, loc
);
1599 DECL_EXTERNAL (decl
) = 1;
1600 TREE_PUBLIC (decl
) = 1;
1604 DECL_CONTEXT (decl
) = current_function_decl
;
1605 TREE_PUBLIC (decl
) = 0;
1606 scope
= current_function_scope
;
1609 bind (DECL_NAME (decl
), decl
, scope
, false, nested
, loc
);
1612 /* Subroutine of compare_decls. Allow harmless mismatches in return
1613 and argument types provided that the type modes match. This function
1614 return a unified type given a suitable match, and 0 otherwise. */
1617 match_builtin_function_types (tree newtype
, tree oldtype
)
1619 tree newrettype
, oldrettype
;
1620 tree newargs
, oldargs
;
1621 tree trytype
, tryargs
;
1623 /* Accept the return type of the new declaration if same modes. */
1624 oldrettype
= TREE_TYPE (oldtype
);
1625 newrettype
= TREE_TYPE (newtype
);
1627 if (TYPE_MODE (oldrettype
) != TYPE_MODE (newrettype
))
1630 oldargs
= TYPE_ARG_TYPES (oldtype
);
1631 newargs
= TYPE_ARG_TYPES (newtype
);
1634 while (oldargs
|| newargs
)
1638 || !TREE_VALUE (oldargs
)
1639 || !TREE_VALUE (newargs
)
1640 || TYPE_MODE (TREE_VALUE (oldargs
))
1641 != TYPE_MODE (TREE_VALUE (newargs
)))
1644 oldargs
= TREE_CHAIN (oldargs
);
1645 newargs
= TREE_CHAIN (newargs
);
1648 trytype
= build_function_type (newrettype
, tryargs
);
1650 /* Allow declaration to change transaction_safe attribute. */
1651 tree oldattrs
= TYPE_ATTRIBUTES (oldtype
);
1652 tree oldtsafe
= lookup_attribute ("transaction_safe", oldattrs
);
1653 tree newattrs
= TYPE_ATTRIBUTES (newtype
);
1654 tree newtsafe
= lookup_attribute ("transaction_safe", newattrs
);
1655 if (oldtsafe
&& !newtsafe
)
1656 oldattrs
= remove_attribute ("transaction_safe", oldattrs
);
1657 else if (newtsafe
&& !oldtsafe
)
1658 oldattrs
= tree_cons (get_identifier ("transaction_safe"),
1659 NULL_TREE
, oldattrs
);
1661 return build_type_attribute_variant (trytype
, oldattrs
);
1664 /* Subroutine of diagnose_mismatched_decls. Check for function type
1665 mismatch involving an empty arglist vs a nonempty one and give clearer
1668 diagnose_arglist_conflict (tree newdecl
, tree olddecl
,
1669 tree newtype
, tree oldtype
)
1673 if (TREE_CODE (olddecl
) != FUNCTION_DECL
1674 || !comptypes (TREE_TYPE (oldtype
), TREE_TYPE (newtype
))
1675 || !((!prototype_p (oldtype
) && DECL_INITIAL (olddecl
) == 0)
1676 || (!prototype_p (newtype
) && DECL_INITIAL (newdecl
) == 0)))
1679 t
= TYPE_ARG_TYPES (oldtype
);
1681 t
= TYPE_ARG_TYPES (newtype
);
1682 for (; t
; t
= TREE_CHAIN (t
))
1684 tree type
= TREE_VALUE (t
);
1686 if (TREE_CHAIN (t
) == 0
1687 && TYPE_MAIN_VARIANT (type
) != void_type_node
)
1689 inform (input_location
, "a parameter list with an ellipsis can%'t match "
1690 "an empty parameter name list declaration");
1694 if (c_type_promotes_to (type
) != type
)
1696 inform (input_location
, "an argument type that has a default promotion can%'t match "
1697 "an empty parameter name list declaration");
1703 /* Another subroutine of diagnose_mismatched_decls. OLDDECL is an
1704 old-style function definition, NEWDECL is a prototype declaration.
1705 Diagnose inconsistencies in the argument list. Returns TRUE if
1706 the prototype is compatible, FALSE if not. */
1708 validate_proto_after_old_defn (tree newdecl
, tree newtype
, tree oldtype
)
1710 tree newargs
, oldargs
;
1713 #define END_OF_ARGLIST(t) ((t) == void_type_node)
1715 oldargs
= TYPE_ACTUAL_ARG_TYPES (oldtype
);
1716 newargs
= TYPE_ARG_TYPES (newtype
);
1721 tree oldargtype
= TREE_VALUE (oldargs
);
1722 tree newargtype
= TREE_VALUE (newargs
);
1724 if (oldargtype
== error_mark_node
|| newargtype
== error_mark_node
)
1727 oldargtype
= (TYPE_ATOMIC (oldargtype
)
1728 ? c_build_qualified_type (TYPE_MAIN_VARIANT (oldargtype
),
1730 : TYPE_MAIN_VARIANT (oldargtype
));
1731 newargtype
= (TYPE_ATOMIC (newargtype
)
1732 ? c_build_qualified_type (TYPE_MAIN_VARIANT (newargtype
),
1734 : TYPE_MAIN_VARIANT (newargtype
));
1736 if (END_OF_ARGLIST (oldargtype
) && END_OF_ARGLIST (newargtype
))
1739 /* Reaching the end of just one list means the two decls don't
1740 agree on the number of arguments. */
1741 if (END_OF_ARGLIST (oldargtype
))
1743 error ("prototype for %q+D declares more arguments "
1744 "than previous old-style definition", newdecl
);
1747 else if (END_OF_ARGLIST (newargtype
))
1749 error ("prototype for %q+D declares fewer arguments "
1750 "than previous old-style definition", newdecl
);
1754 /* Type for passing arg must be consistent with that declared
1756 else if (!comptypes (oldargtype
, newargtype
))
1758 error ("prototype for %q+D declares argument %d"
1759 " with incompatible type",
1764 oldargs
= TREE_CHAIN (oldargs
);
1765 newargs
= TREE_CHAIN (newargs
);
1769 /* If we get here, no errors were found, but do issue a warning
1770 for this poor-style construct. */
1771 warning (0, "prototype for %q+D follows non-prototype definition",
1774 #undef END_OF_ARGLIST
1777 /* Subroutine of diagnose_mismatched_decls. Report the location of DECL,
1778 first in a pair of mismatched declarations, using the diagnostic
1781 locate_old_decl (tree decl
)
1783 if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_BUILT_IN (decl
)
1784 && !C_DECL_DECLARED_BUILTIN (decl
))
1786 else if (DECL_INITIAL (decl
))
1787 inform (input_location
, "previous definition of %q+D was here", decl
);
1788 else if (C_DECL_IMPLICIT (decl
))
1789 inform (input_location
, "previous implicit declaration of %q+D was here", decl
);
1791 inform (input_location
, "previous declaration of %q+D was here", decl
);
1794 /* Subroutine of duplicate_decls. Compare NEWDECL to OLDDECL.
1795 Returns true if the caller should proceed to merge the two, false
1796 if OLDDECL should simply be discarded. As a side effect, issues
1797 all necessary diagnostics for invalid or poor-style combinations.
1798 If it returns true, writes the types of NEWDECL and OLDDECL to
1799 *NEWTYPEP and *OLDTYPEP - these may have been adjusted from
1800 TREE_TYPE (NEWDECL, OLDDECL) respectively. */
1803 diagnose_mismatched_decls (tree newdecl
, tree olddecl
,
1804 tree
*newtypep
, tree
*oldtypep
)
1806 tree newtype
, oldtype
;
1807 bool pedwarned
= false;
1808 bool warned
= false;
1811 #define DECL_EXTERN_INLINE(DECL) (DECL_DECLARED_INLINE_P (DECL) \
1812 && DECL_EXTERNAL (DECL))
1814 /* If we have error_mark_node for either decl or type, just discard
1815 the previous decl - we're in an error cascade already. */
1816 if (olddecl
== error_mark_node
|| newdecl
== error_mark_node
)
1818 *oldtypep
= oldtype
= TREE_TYPE (olddecl
);
1819 *newtypep
= newtype
= TREE_TYPE (newdecl
);
1820 if (oldtype
== error_mark_node
|| newtype
== error_mark_node
)
1823 /* Two different categories of symbol altogether. This is an error
1824 unless OLDDECL is a builtin. OLDDECL will be discarded in any case. */
1825 if (TREE_CODE (olddecl
) != TREE_CODE (newdecl
))
1827 if (!(TREE_CODE (olddecl
) == FUNCTION_DECL
1828 && DECL_BUILT_IN (olddecl
)
1829 && !C_DECL_DECLARED_BUILTIN (olddecl
)))
1831 error ("%q+D redeclared as different kind of symbol", newdecl
);
1832 locate_old_decl (olddecl
);
1834 else if (TREE_PUBLIC (newdecl
))
1835 warning (0, "built-in function %q+D declared as non-function",
1838 warning (OPT_Wshadow
, "declaration of %q+D shadows "
1839 "a built-in function", newdecl
);
1843 /* Enumerators have no linkage, so may only be declared once in a
1845 if (TREE_CODE (olddecl
) == CONST_DECL
)
1847 error ("redeclaration of enumerator %q+D", newdecl
);
1848 locate_old_decl (olddecl
);
1852 if (!comptypes (oldtype
, newtype
))
1854 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1855 && DECL_BUILT_IN (olddecl
) && !C_DECL_DECLARED_BUILTIN (olddecl
))
1857 /* Accept harmless mismatch in function types.
1858 This is for the ffs and fprintf builtins. */
1859 tree trytype
= match_builtin_function_types (newtype
, oldtype
);
1861 if (trytype
&& comptypes (newtype
, trytype
))
1862 *oldtypep
= oldtype
= trytype
;
1865 /* If types don't match for a built-in, throw away the
1866 built-in. No point in calling locate_old_decl here, it
1867 won't print anything. */
1868 warning (0, "conflicting types for built-in function %q+D",
1873 else if (TREE_CODE (olddecl
) == FUNCTION_DECL
1874 && DECL_IS_BUILTIN (olddecl
))
1876 /* A conflicting function declaration for a predeclared
1877 function that isn't actually built in. Objective C uses
1878 these. The new declaration silently overrides everything
1879 but the volatility (i.e. noreturn) indication. See also
1880 below. FIXME: Make Objective C use normal builtins. */
1881 TREE_THIS_VOLATILE (newdecl
) |= TREE_THIS_VOLATILE (olddecl
);
1884 /* Permit void foo (...) to match int foo (...) if the latter is
1885 the definition and implicit int was used. See
1886 c-torture/compile/920625-2.c. */
1887 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
&& DECL_INITIAL (newdecl
)
1888 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype
)) == void_type_node
1889 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype
)) == integer_type_node
1890 && C_FUNCTION_IMPLICIT_INT (newdecl
) && !DECL_INITIAL (olddecl
))
1892 pedwarned
= pedwarn (input_location
, 0,
1893 "conflicting types for %q+D", newdecl
);
1894 /* Make sure we keep void as the return type. */
1895 TREE_TYPE (newdecl
) = *newtypep
= newtype
= oldtype
;
1896 C_FUNCTION_IMPLICIT_INT (newdecl
) = 0;
1898 /* Permit void foo (...) to match an earlier call to foo (...) with
1899 no declared type (thus, implicitly int). */
1900 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
1901 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype
)) == void_type_node
1902 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype
)) == integer_type_node
1903 && C_DECL_IMPLICIT (olddecl
) && !DECL_INITIAL (olddecl
))
1905 pedwarned
= pedwarn (input_location
, 0,
1906 "conflicting types for %q+D", newdecl
);
1907 /* Make sure we keep void as the return type. */
1908 TREE_TYPE (olddecl
) = *oldtypep
= oldtype
= newtype
;
1912 int new_quals
= TYPE_QUALS (newtype
);
1913 int old_quals
= TYPE_QUALS (oldtype
);
1915 if (new_quals
!= old_quals
)
1917 addr_space_t new_addr
= DECODE_QUAL_ADDR_SPACE (new_quals
);
1918 addr_space_t old_addr
= DECODE_QUAL_ADDR_SPACE (old_quals
);
1919 if (new_addr
!= old_addr
)
1921 if (ADDR_SPACE_GENERIC_P (new_addr
))
1922 error ("conflicting named address spaces (generic vs %s) "
1924 c_addr_space_name (old_addr
), newdecl
);
1925 else if (ADDR_SPACE_GENERIC_P (old_addr
))
1926 error ("conflicting named address spaces (%s vs generic) "
1928 c_addr_space_name (new_addr
), newdecl
);
1930 error ("conflicting named address spaces (%s vs %s) "
1932 c_addr_space_name (new_addr
),
1933 c_addr_space_name (old_addr
),
1937 if (CLEAR_QUAL_ADDR_SPACE (new_quals
)
1938 != CLEAR_QUAL_ADDR_SPACE (old_quals
))
1939 error ("conflicting type qualifiers for %q+D", newdecl
);
1942 error ("conflicting types for %q+D", newdecl
);
1943 diagnose_arglist_conflict (newdecl
, olddecl
, newtype
, oldtype
);
1944 locate_old_decl (olddecl
);
1949 /* Redeclaration of a type is a constraint violation (6.7.2.3p1),
1950 but silently ignore the redeclaration if either is in a system
1951 header. (Conflicting redeclarations were handled above.) This
1952 is allowed for C11 if the types are the same, not just
1954 if (TREE_CODE (newdecl
) == TYPE_DECL
)
1956 bool types_different
= false;
1957 int comptypes_result
;
1960 = comptypes_check_different_types (oldtype
, newtype
, &types_different
);
1962 if (comptypes_result
!= 1 || types_different
)
1964 error ("redefinition of typedef %q+D with different type", newdecl
);
1965 locate_old_decl (olddecl
);
1969 if (DECL_IN_SYSTEM_HEADER (newdecl
)
1970 || DECL_IN_SYSTEM_HEADER (olddecl
)
1971 || TREE_NO_WARNING (newdecl
)
1972 || TREE_NO_WARNING (olddecl
))
1973 return true; /* Allow OLDDECL to continue in use. */
1975 if (variably_modified_type_p (newtype
, NULL
))
1977 error ("redefinition of typedef %q+D with variably modified type",
1979 locate_old_decl (olddecl
);
1981 else if (pedwarn_c99 (input_location
, OPT_Wpedantic
,
1982 "redefinition of typedef %q+D", newdecl
))
1983 locate_old_decl (olddecl
);
1988 /* Function declarations can either be 'static' or 'extern' (no
1989 qualifier is equivalent to 'extern' - C99 6.2.2p5) and therefore
1990 can never conflict with each other on account of linkage
1991 (6.2.2p4). Multiple definitions are not allowed (6.9p3,5) but
1992 gnu89 mode permits two definitions if one is 'extern inline' and
1993 one is not. The non- extern-inline definition supersedes the
1994 extern-inline definition. */
1996 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1998 /* If you declare a built-in function name as static, or
1999 define the built-in with an old-style definition (so we
2000 can't validate the argument list) the built-in definition is
2001 overridden, but optionally warn this was a bad choice of name. */
2002 if (DECL_BUILT_IN (olddecl
)
2003 && !C_DECL_DECLARED_BUILTIN (olddecl
)
2004 && (!TREE_PUBLIC (newdecl
)
2005 || (DECL_INITIAL (newdecl
)
2006 && !prototype_p (TREE_TYPE (newdecl
)))))
2008 warning (OPT_Wshadow
, "declaration of %q+D shadows "
2009 "a built-in function", newdecl
);
2010 /* Discard the old built-in function. */
2014 if (DECL_INITIAL (newdecl
))
2016 if (DECL_INITIAL (olddecl
))
2018 /* If both decls are in the same TU and the new declaration
2019 isn't overriding an extern inline reject the new decl.
2020 In c99, no overriding is allowed in the same translation
2022 if ((!DECL_EXTERN_INLINE (olddecl
)
2023 || DECL_EXTERN_INLINE (newdecl
)
2024 || (!flag_gnu89_inline
2025 && (!DECL_DECLARED_INLINE_P (olddecl
)
2026 || !lookup_attribute ("gnu_inline",
2027 DECL_ATTRIBUTES (olddecl
)))
2028 && (!DECL_DECLARED_INLINE_P (newdecl
)
2029 || !lookup_attribute ("gnu_inline",
2030 DECL_ATTRIBUTES (newdecl
))))
2032 && same_translation_unit_p (newdecl
, olddecl
))
2034 error ("redefinition of %q+D", newdecl
);
2035 locate_old_decl (olddecl
);
2040 /* If we have a prototype after an old-style function definition,
2041 the argument types must be checked specially. */
2042 else if (DECL_INITIAL (olddecl
)
2043 && !prototype_p (oldtype
) && prototype_p (newtype
)
2044 && TYPE_ACTUAL_ARG_TYPES (oldtype
)
2045 && !validate_proto_after_old_defn (newdecl
, newtype
, oldtype
))
2047 locate_old_decl (olddecl
);
2050 /* A non-static declaration (even an "extern") followed by a
2051 static declaration is undefined behavior per C99 6.2.2p3-5,7.
2052 The same is true for a static forward declaration at block
2053 scope followed by a non-static declaration/definition at file
2054 scope. Static followed by non-static at the same scope is
2055 not undefined behavior, and is the most convenient way to get
2056 some effects (see e.g. what unwind-dw2-fde-glibc.c does to
2057 the definition of _Unwind_Find_FDE in unwind-dw2-fde.c), but
2058 we do diagnose it if -Wtraditional. */
2059 if (TREE_PUBLIC (olddecl
) && !TREE_PUBLIC (newdecl
))
2061 /* Two exceptions to the rule. If olddecl is an extern
2062 inline, or a predeclared function that isn't actually
2063 built in, newdecl silently overrides olddecl. The latter
2064 occur only in Objective C; see also above. (FIXME: Make
2065 Objective C use normal builtins.) */
2066 if (!DECL_IS_BUILTIN (olddecl
)
2067 && !DECL_EXTERN_INLINE (olddecl
))
2069 error ("static declaration of %q+D follows "
2070 "non-static declaration", newdecl
);
2071 locate_old_decl (olddecl
);
2075 else if (TREE_PUBLIC (newdecl
) && !TREE_PUBLIC (olddecl
))
2077 if (DECL_CONTEXT (olddecl
))
2079 error ("non-static declaration of %q+D follows "
2080 "static declaration", newdecl
);
2081 locate_old_decl (olddecl
);
2084 else if (warn_traditional
)
2086 warned
|= warning (OPT_Wtraditional
,
2087 "non-static declaration of %q+D "
2088 "follows static declaration", newdecl
);
2092 /* Make sure gnu_inline attribute is either not present, or
2093 present on all inline decls. */
2094 if (DECL_DECLARED_INLINE_P (olddecl
)
2095 && DECL_DECLARED_INLINE_P (newdecl
))
2097 bool newa
= lookup_attribute ("gnu_inline",
2098 DECL_ATTRIBUTES (newdecl
)) != NULL
;
2099 bool olda
= lookup_attribute ("gnu_inline",
2100 DECL_ATTRIBUTES (olddecl
)) != NULL
;
2103 error_at (input_location
, "%<gnu_inline%> attribute present on %q+D",
2104 newa
? newdecl
: olddecl
);
2105 error_at (DECL_SOURCE_LOCATION (newa
? olddecl
: newdecl
),
2110 else if (VAR_P (newdecl
))
2112 /* Only variables can be thread-local, and all declarations must
2113 agree on this property. */
2114 if (C_DECL_THREADPRIVATE_P (olddecl
) && !DECL_THREAD_LOCAL_P (newdecl
))
2116 /* Nothing to check. Since OLDDECL is marked threadprivate
2117 and NEWDECL does not have a thread-local attribute, we
2118 will merge the threadprivate attribute into NEWDECL. */
2121 else if (DECL_THREAD_LOCAL_P (newdecl
) != DECL_THREAD_LOCAL_P (olddecl
))
2123 if (DECL_THREAD_LOCAL_P (newdecl
))
2124 error ("thread-local declaration of %q+D follows "
2125 "non-thread-local declaration", newdecl
);
2127 error ("non-thread-local declaration of %q+D follows "
2128 "thread-local declaration", newdecl
);
2130 locate_old_decl (olddecl
);
2134 /* Multiple initialized definitions are not allowed (6.9p3,5). */
2135 if (DECL_INITIAL (newdecl
) && DECL_INITIAL (olddecl
))
2137 error ("redefinition of %q+D", newdecl
);
2138 locate_old_decl (olddecl
);
2142 /* Objects declared at file scope: if the first declaration had
2143 external linkage (even if it was an external reference) the
2144 second must have external linkage as well, or the behavior is
2145 undefined. If the first declaration had internal linkage, then
2146 the second must too, or else be an external reference (in which
2147 case the composite declaration still has internal linkage).
2148 As for function declarations, we warn about the static-then-
2149 extern case only for -Wtraditional. See generally 6.2.2p3-5,7. */
2150 if (DECL_FILE_SCOPE_P (newdecl
)
2151 && TREE_PUBLIC (newdecl
) != TREE_PUBLIC (olddecl
))
2153 if (DECL_EXTERNAL (newdecl
))
2155 if (!DECL_FILE_SCOPE_P (olddecl
))
2157 error ("extern declaration of %q+D follows "
2158 "declaration with no linkage", newdecl
);
2159 locate_old_decl (olddecl
);
2162 else if (warn_traditional
)
2164 warned
|= warning (OPT_Wtraditional
,
2165 "non-static declaration of %q+D "
2166 "follows static declaration", newdecl
);
2171 if (TREE_PUBLIC (newdecl
))
2172 error ("non-static declaration of %q+D follows "
2173 "static declaration", newdecl
);
2175 error ("static declaration of %q+D follows "
2176 "non-static declaration", newdecl
);
2178 locate_old_decl (olddecl
);
2182 /* Two objects with the same name declared at the same block
2183 scope must both be external references (6.7p3). */
2184 else if (!DECL_FILE_SCOPE_P (newdecl
))
2186 if (DECL_EXTERNAL (newdecl
))
2188 /* Extern with initializer at block scope, which will
2189 already have received an error. */
2191 else if (DECL_EXTERNAL (olddecl
))
2193 error ("declaration of %q+D with no linkage follows "
2194 "extern declaration", newdecl
);
2195 locate_old_decl (olddecl
);
2199 error ("redeclaration of %q+D with no linkage", newdecl
);
2200 locate_old_decl (olddecl
);
2206 /* C++ does not permit a decl to appear multiple times at file
2209 && DECL_FILE_SCOPE_P (newdecl
)
2210 && !DECL_EXTERNAL (newdecl
)
2211 && !DECL_EXTERNAL (olddecl
))
2212 warned
|= warning_at (DECL_SOURCE_LOCATION (newdecl
),
2214 ("duplicate declaration of %qD is "
2220 /* All decls must agree on a visibility. */
2221 if (CODE_CONTAINS_STRUCT (TREE_CODE (newdecl
), TS_DECL_WITH_VIS
)
2222 && DECL_VISIBILITY_SPECIFIED (newdecl
) && DECL_VISIBILITY_SPECIFIED (olddecl
)
2223 && DECL_VISIBILITY (newdecl
) != DECL_VISIBILITY (olddecl
))
2225 warned
|= warning (0, "redeclaration of %q+D with different visibility "
2226 "(old visibility preserved)", newdecl
);
2229 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2231 /* Diagnose inline __attribute__ ((noinline)) which is silly. */
2232 if (DECL_DECLARED_INLINE_P (newdecl
)
2233 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl
)))
2234 warned
|= warning (OPT_Wattributes
,
2235 "inline declaration of %qD follows "
2236 "declaration with attribute noinline", newdecl
);
2237 else if (DECL_DECLARED_INLINE_P (olddecl
)
2238 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl
)))
2239 warned
|= warning (OPT_Wattributes
,
2240 "declaration of %q+D with attribute "
2241 "noinline follows inline declaration ", newdecl
);
2242 else if (lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl
))
2243 && lookup_attribute ("always_inline", DECL_ATTRIBUTES (olddecl
)))
2244 warned
|= warning (OPT_Wattributes
,
2245 "declaration of %q+D with attribute "
2246 "%qs follows declaration with attribute %qs",
2247 newdecl
, "noinline", "always_inline");
2248 else if (lookup_attribute ("always_inline", DECL_ATTRIBUTES (newdecl
))
2249 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl
)))
2250 warned
|= warning (OPT_Wattributes
,
2251 "declaration of %q+D with attribute "
2252 "%qs follows declaration with attribute %qs",
2253 newdecl
, "always_inline", "noinline");
2254 else if (lookup_attribute ("cold", DECL_ATTRIBUTES (newdecl
))
2255 && lookup_attribute ("hot", DECL_ATTRIBUTES (olddecl
)))
2256 warned
|= warning (OPT_Wattributes
,
2257 "declaration of %q+D with attribute %qs follows "
2258 "declaration with attribute %qs", newdecl
, "cold",
2260 else if (lookup_attribute ("hot", DECL_ATTRIBUTES (newdecl
))
2261 && lookup_attribute ("cold", DECL_ATTRIBUTES (olddecl
)))
2262 warned
|= warning (OPT_Wattributes
,
2263 "declaration of %q+D with attribute %qs follows "
2264 "declaration with attribute %qs", newdecl
, "hot",
2267 else /* PARM_DECL, VAR_DECL */
2269 /* Redeclaration of a parameter is a constraint violation (this is
2270 not explicitly stated, but follows from C99 6.7p3 [no more than
2271 one declaration of the same identifier with no linkage in the
2272 same scope, except type tags] and 6.2.2p6 [parameters have no
2273 linkage]). We must check for a forward parameter declaration,
2274 indicated by TREE_ASM_WRITTEN on the old declaration - this is
2275 an extension, the mandatory diagnostic for which is handled by
2276 mark_forward_parm_decls. */
2278 if (TREE_CODE (newdecl
) == PARM_DECL
2279 && (!TREE_ASM_WRITTEN (olddecl
) || TREE_ASM_WRITTEN (newdecl
)))
2281 error ("redefinition of parameter %q+D", newdecl
);
2282 locate_old_decl (olddecl
);
2287 /* Optional warning for completely redundant decls. */
2288 if (!warned
&& !pedwarned
2289 && warn_redundant_decls
2290 /* Don't warn about a function declaration followed by a
2292 && !(TREE_CODE (newdecl
) == FUNCTION_DECL
2293 && DECL_INITIAL (newdecl
) && !DECL_INITIAL (olddecl
))
2294 /* Don't warn about redundant redeclarations of builtins. */
2295 && !(TREE_CODE (newdecl
) == FUNCTION_DECL
2296 && !DECL_BUILT_IN (newdecl
)
2297 && DECL_BUILT_IN (olddecl
)
2298 && !C_DECL_DECLARED_BUILTIN (olddecl
))
2299 /* Don't warn about an extern followed by a definition. */
2300 && !(DECL_EXTERNAL (olddecl
) && !DECL_EXTERNAL (newdecl
))
2301 /* Don't warn about forward parameter decls. */
2302 && !(TREE_CODE (newdecl
) == PARM_DECL
2303 && TREE_ASM_WRITTEN (olddecl
) && !TREE_ASM_WRITTEN (newdecl
))
2304 /* Don't warn about a variable definition following a declaration. */
2305 && !(VAR_P (newdecl
)
2306 && DECL_INITIAL (newdecl
) && !DECL_INITIAL (olddecl
)))
2308 warned
= warning (OPT_Wredundant_decls
, "redundant redeclaration of %q+D",
2312 /* Report location of previous decl/defn. */
2313 if (warned
|| pedwarned
)
2314 locate_old_decl (olddecl
);
2316 #undef DECL_EXTERN_INLINE
2321 /* Subroutine of duplicate_decls. NEWDECL has been found to be
2322 consistent with OLDDECL, but carries new information. Merge the
2323 new information into OLDDECL. This function issues no
2327 merge_decls (tree newdecl
, tree olddecl
, tree newtype
, tree oldtype
)
2329 bool new_is_definition
= (TREE_CODE (newdecl
) == FUNCTION_DECL
2330 && DECL_INITIAL (newdecl
) != 0);
2331 bool new_is_prototype
= (TREE_CODE (newdecl
) == FUNCTION_DECL
2332 && prototype_p (TREE_TYPE (newdecl
)));
2333 bool old_is_prototype
= (TREE_CODE (olddecl
) == FUNCTION_DECL
2334 && prototype_p (TREE_TYPE (olddecl
)));
2336 /* For real parm decl following a forward decl, rechain the old decl
2337 in its new location and clear TREE_ASM_WRITTEN (it's not a
2338 forward decl anymore). */
2339 if (TREE_CODE (newdecl
) == PARM_DECL
2340 && TREE_ASM_WRITTEN (olddecl
) && !TREE_ASM_WRITTEN (newdecl
))
2342 struct c_binding
*b
, **here
;
2344 for (here
= ¤t_scope
->bindings
; *here
; here
= &(*here
)->prev
)
2345 if ((*here
)->decl
== olddecl
)
2352 b
->prev
= current_scope
->bindings
;
2353 current_scope
->bindings
= b
;
2355 TREE_ASM_WRITTEN (olddecl
) = 0;
2358 DECL_ATTRIBUTES (newdecl
)
2359 = targetm
.merge_decl_attributes (olddecl
, newdecl
);
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 DECL_MODE (newdecl
) = DECL_MODE (olddecl
);
2382 if (DECL_ALIGN (olddecl
) > DECL_ALIGN (newdecl
))
2384 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
) == 0 && DECL_INITIAL (olddecl
) != 0)
2417 || (old_is_prototype
&& !new_is_prototype
2418 && !C_DECL_BUILTIN_PROTOTYPE (olddecl
)))
2419 DECL_SOURCE_LOCATION (newdecl
) = DECL_SOURCE_LOCATION (olddecl
);
2421 /* Merge the initialization information. */
2422 if (DECL_INITIAL (newdecl
) == 0)
2423 DECL_INITIAL (newdecl
) = DECL_INITIAL (olddecl
);
2425 /* Merge the threadprivate attribute. */
2426 if (VAR_P (olddecl
) && C_DECL_THREADPRIVATE_P (olddecl
))
2427 C_DECL_THREADPRIVATE_P (newdecl
) = 1;
2429 if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl
), TS_DECL_WITH_VIS
))
2431 /* Copy the assembler name.
2432 Currently, it can only be defined in the prototype. */
2433 COPY_DECL_ASSEMBLER_NAME (olddecl
, newdecl
);
2435 /* Use visibility of whichever declaration had it specified */
2436 if (DECL_VISIBILITY_SPECIFIED (olddecl
))
2438 DECL_VISIBILITY (newdecl
) = DECL_VISIBILITY (olddecl
);
2439 DECL_VISIBILITY_SPECIFIED (newdecl
) = 1;
2442 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2444 DECL_STATIC_CONSTRUCTOR(newdecl
) |= DECL_STATIC_CONSTRUCTOR(olddecl
);
2445 DECL_STATIC_DESTRUCTOR (newdecl
) |= DECL_STATIC_DESTRUCTOR (olddecl
);
2446 DECL_NO_LIMIT_STACK (newdecl
) |= DECL_NO_LIMIT_STACK (olddecl
);
2447 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl
)
2448 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl
);
2449 TREE_THIS_VOLATILE (newdecl
) |= TREE_THIS_VOLATILE (olddecl
);
2450 DECL_IS_MALLOC (newdecl
) |= DECL_IS_MALLOC (olddecl
);
2451 DECL_IS_OPERATOR_NEW (newdecl
) |= DECL_IS_OPERATOR_NEW (olddecl
);
2452 TREE_READONLY (newdecl
) |= TREE_READONLY (olddecl
);
2453 DECL_PURE_P (newdecl
) |= DECL_PURE_P (olddecl
);
2454 DECL_IS_NOVOPS (newdecl
) |= DECL_IS_NOVOPS (olddecl
);
2457 /* Merge the storage class information. */
2458 merge_weak (newdecl
, olddecl
);
2460 /* For functions, static overrides non-static. */
2461 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2463 TREE_PUBLIC (newdecl
) &= TREE_PUBLIC (olddecl
);
2464 /* This is since we don't automatically
2465 copy the attributes of NEWDECL into OLDDECL. */
2466 TREE_PUBLIC (olddecl
) = TREE_PUBLIC (newdecl
);
2467 /* If this clears `static', clear it in the identifier too. */
2468 if (!TREE_PUBLIC (olddecl
))
2469 TREE_PUBLIC (DECL_NAME (olddecl
)) = 0;
2473 /* In c99, 'extern' declaration before (or after) 'inline' means this
2474 function is not DECL_EXTERNAL, unless 'gnu_inline' attribute
2476 if (TREE_CODE (newdecl
) == FUNCTION_DECL
2477 && !flag_gnu89_inline
2478 && (DECL_DECLARED_INLINE_P (newdecl
)
2479 || DECL_DECLARED_INLINE_P (olddecl
))
2480 && (!DECL_DECLARED_INLINE_P (newdecl
)
2481 || !DECL_DECLARED_INLINE_P (olddecl
)
2482 || !DECL_EXTERNAL (olddecl
))
2483 && DECL_EXTERNAL (newdecl
)
2484 && !lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (newdecl
))
2485 && !current_function_decl
)
2486 DECL_EXTERNAL (newdecl
) = 0;
2488 /* An inline definition following a static declaration is not
2490 if (new_is_definition
2491 && (DECL_DECLARED_INLINE_P (newdecl
)
2492 || DECL_DECLARED_INLINE_P (olddecl
))
2493 && !TREE_PUBLIC (olddecl
))
2494 DECL_EXTERNAL (newdecl
) = 0;
2496 if (DECL_EXTERNAL (newdecl
))
2498 TREE_STATIC (newdecl
) = TREE_STATIC (olddecl
);
2499 DECL_EXTERNAL (newdecl
) = DECL_EXTERNAL (olddecl
);
2501 /* An extern decl does not override previous storage class. */
2502 TREE_PUBLIC (newdecl
) = TREE_PUBLIC (olddecl
);
2503 if (!DECL_EXTERNAL (newdecl
))
2505 DECL_CONTEXT (newdecl
) = DECL_CONTEXT (olddecl
);
2506 DECL_COMMON (newdecl
) = DECL_COMMON (olddecl
);
2511 TREE_STATIC (olddecl
) = TREE_STATIC (newdecl
);
2512 TREE_PUBLIC (olddecl
) = TREE_PUBLIC (newdecl
);
2515 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2517 /* If we're redefining a function previously defined as extern
2518 inline, make sure we emit debug info for the inline before we
2519 throw it away, in case it was inlined into a function that
2520 hasn't been written out yet. */
2521 if (new_is_definition
&& DECL_INITIAL (olddecl
))
2522 /* The new defn must not be inline. */
2523 DECL_UNINLINABLE (newdecl
) = 1;
2526 /* If either decl says `inline', this fn is inline, unless
2527 its definition was passed already. */
2528 if (DECL_DECLARED_INLINE_P (newdecl
)
2529 || DECL_DECLARED_INLINE_P (olddecl
))
2530 DECL_DECLARED_INLINE_P (newdecl
) = 1;
2532 DECL_UNINLINABLE (newdecl
) = DECL_UNINLINABLE (olddecl
)
2533 = (DECL_UNINLINABLE (newdecl
) || DECL_UNINLINABLE (olddecl
));
2535 DECL_DISREGARD_INLINE_LIMITS (newdecl
)
2536 = DECL_DISREGARD_INLINE_LIMITS (olddecl
)
2537 = (DECL_DISREGARD_INLINE_LIMITS (newdecl
)
2538 || DECL_DISREGARD_INLINE_LIMITS (olddecl
));
2541 if (DECL_BUILT_IN (olddecl
))
2543 /* If redeclaring a builtin function, it stays built in.
2544 But it gets tagged as having been declared. */
2545 DECL_BUILT_IN_CLASS (newdecl
) = DECL_BUILT_IN_CLASS (olddecl
);
2546 DECL_FUNCTION_CODE (newdecl
) = DECL_FUNCTION_CODE (olddecl
);
2547 C_DECL_DECLARED_BUILTIN (newdecl
) = 1;
2548 if (new_is_prototype
)
2550 C_DECL_BUILTIN_PROTOTYPE (newdecl
) = 0;
2551 if (DECL_BUILT_IN_CLASS (newdecl
) == BUILT_IN_NORMAL
)
2553 enum built_in_function fncode
= DECL_FUNCTION_CODE (newdecl
);
2556 /* If a compatible prototype of these builtin functions
2557 is seen, assume the runtime implements it with the
2558 expected semantics. */
2559 case BUILT_IN_STPCPY
:
2560 if (builtin_decl_explicit_p (fncode
))
2561 set_builtin_decl_implicit_p (fncode
, true);
2564 if (builtin_decl_explicit_p (fncode
))
2565 set_builtin_decl_declared_p (fncode
, true);
2571 C_DECL_BUILTIN_PROTOTYPE (newdecl
)
2572 = C_DECL_BUILTIN_PROTOTYPE (olddecl
);
2575 /* Preserve function specific target and optimization options */
2576 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl
)
2577 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl
))
2578 DECL_FUNCTION_SPECIFIC_TARGET (newdecl
)
2579 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl
);
2581 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl
)
2582 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl
))
2583 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl
)
2584 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl
);
2586 /* Also preserve various other info from the definition. */
2587 if (!new_is_definition
)
2590 DECL_RESULT (newdecl
) = DECL_RESULT (olddecl
);
2591 DECL_INITIAL (newdecl
) = DECL_INITIAL (olddecl
);
2592 DECL_STRUCT_FUNCTION (newdecl
) = DECL_STRUCT_FUNCTION (olddecl
);
2593 DECL_SAVED_TREE (newdecl
) = DECL_SAVED_TREE (olddecl
);
2594 DECL_ARGUMENTS (newdecl
) = copy_list (DECL_ARGUMENTS (olddecl
));
2595 for (t
= DECL_ARGUMENTS (newdecl
); t
; t
= DECL_CHAIN (t
))
2596 DECL_CONTEXT (t
) = newdecl
;
2598 /* See if we've got a function to instantiate from. */
2599 if (DECL_SAVED_TREE (olddecl
))
2600 DECL_ABSTRACT_ORIGIN (newdecl
)
2601 = DECL_ABSTRACT_ORIGIN (olddecl
);
2605 /* Merge the USED information. */
2606 if (TREE_USED (olddecl
))
2607 TREE_USED (newdecl
) = 1;
2608 else if (TREE_USED (newdecl
))
2609 TREE_USED (olddecl
) = 1;
2610 if (VAR_P (olddecl
) || TREE_CODE (olddecl
) == PARM_DECL
)
2611 DECL_READ_P (newdecl
) |= DECL_READ_P (olddecl
);
2612 if (DECL_PRESERVE_P (olddecl
))
2613 DECL_PRESERVE_P (newdecl
) = 1;
2614 else if (DECL_PRESERVE_P (newdecl
))
2615 DECL_PRESERVE_P (olddecl
) = 1;
2617 /* Merge DECL_COMMON */
2618 if (VAR_P (olddecl
) && VAR_P (newdecl
)
2619 && !lookup_attribute ("common", DECL_ATTRIBUTES (newdecl
))
2620 && !lookup_attribute ("nocommon", DECL_ATTRIBUTES (newdecl
)))
2621 DECL_COMMON (newdecl
) = DECL_COMMON (newdecl
) && DECL_COMMON (olddecl
);
2623 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
2624 But preserve OLDDECL's DECL_UID, DECL_CONTEXT and
2625 DECL_ARGUMENTS (if appropriate). */
2627 unsigned olddecl_uid
= DECL_UID (olddecl
);
2628 tree olddecl_context
= DECL_CONTEXT (olddecl
);
2629 tree olddecl_arguments
= NULL
;
2630 if (TREE_CODE (olddecl
) == FUNCTION_DECL
)
2631 olddecl_arguments
= DECL_ARGUMENTS (olddecl
);
2633 memcpy ((char *) olddecl
+ sizeof (struct tree_common
),
2634 (char *) newdecl
+ sizeof (struct tree_common
),
2635 sizeof (struct tree_decl_common
) - sizeof (struct tree_common
));
2636 DECL_USER_ALIGN (olddecl
) = DECL_USER_ALIGN (newdecl
);
2637 switch (TREE_CODE (olddecl
))
2642 struct symtab_node
*snode
= olddecl
->decl_with_vis
.symtab_node
;
2644 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
2645 (char *) newdecl
+ sizeof (struct tree_decl_common
),
2646 tree_code_size (TREE_CODE (olddecl
)) - sizeof (struct tree_decl_common
));
2647 olddecl
->decl_with_vis
.symtab_node
= snode
;
2649 if ((DECL_EXTERNAL (olddecl
)
2650 || TREE_PUBLIC (olddecl
)
2651 || TREE_STATIC (olddecl
))
2652 && DECL_SECTION_NAME (newdecl
) != NULL
)
2653 set_decl_section_name (olddecl
, DECL_SECTION_NAME (newdecl
));
2655 /* This isn't quite correct for something like
2656 int __thread x attribute ((tls_model ("local-exec")));
2657 extern int __thread x;
2658 as we'll lose the "local-exec" model. */
2659 if (VAR_P (olddecl
) && DECL_THREAD_LOCAL_P (newdecl
))
2660 set_decl_tls_model (olddecl
, DECL_TLS_MODEL (newdecl
));
2670 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
2671 (char *) newdecl
+ sizeof (struct tree_decl_common
),
2672 tree_code_size (TREE_CODE (olddecl
)) - sizeof (struct tree_decl_common
));
2677 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
2678 (char *) newdecl
+ sizeof (struct tree_decl_common
),
2679 sizeof (struct tree_decl_non_common
) - sizeof (struct tree_decl_common
));
2681 DECL_UID (olddecl
) = olddecl_uid
;
2682 DECL_CONTEXT (olddecl
) = olddecl_context
;
2683 if (TREE_CODE (olddecl
) == FUNCTION_DECL
)
2684 DECL_ARGUMENTS (olddecl
) = olddecl_arguments
;
2687 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2688 so that encode_section_info has a chance to look at the new decl
2689 flags and attributes. */
2690 if (DECL_RTL_SET_P (olddecl
)
2691 && (TREE_CODE (olddecl
) == FUNCTION_DECL
2692 || (VAR_P (olddecl
) && TREE_STATIC (olddecl
))))
2693 make_decl_rtl (olddecl
);
2696 /* Handle when a new declaration NEWDECL has the same name as an old
2697 one OLDDECL in the same binding contour. Prints an error message
2700 If safely possible, alter OLDDECL to look like NEWDECL, and return
2701 true. Otherwise, return false. */
2704 duplicate_decls (tree newdecl
, tree olddecl
)
2706 tree newtype
= NULL
, oldtype
= NULL
;
2708 if (!diagnose_mismatched_decls (newdecl
, olddecl
, &newtype
, &oldtype
))
2710 /* Avoid `unused variable' and other warnings for OLDDECL. */
2711 TREE_NO_WARNING (olddecl
) = 1;
2715 merge_decls (newdecl
, olddecl
, newtype
, oldtype
);
2717 /* The NEWDECL will no longer be needed.
2719 Before releasing the node, be sure to remove function from symbol
2720 table that might have been inserted there to record comdat group.
2721 Be sure to however do not free DECL_STRUCT_FUNCTION because this
2722 structure is shared in between NEWDECL and OLDECL. */
2723 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2724 DECL_STRUCT_FUNCTION (newdecl
) = NULL
;
2725 if (VAR_OR_FUNCTION_DECL_P (newdecl
))
2727 struct symtab_node
*snode
= symtab_node::get (newdecl
);
2736 /* Check whether decl-node NEW_DECL shadows an existing declaration. */
2738 warn_if_shadowing (tree new_decl
)
2740 struct c_binding
*b
;
2742 /* Shadow warnings wanted? */
2744 /* No shadow warnings for internally generated vars. */
2745 || DECL_IS_BUILTIN (new_decl
)
2746 /* No shadow warnings for vars made for inlining. */
2747 || DECL_FROM_INLINE (new_decl
))
2750 /* Is anything being shadowed? Invisible decls do not count. */
2751 for (b
= I_SYMBOL_BINDING (DECL_NAME (new_decl
)); b
; b
= b
->shadowed
)
2752 if (b
->decl
&& b
->decl
!= new_decl
&& !b
->invisible
2753 && (b
->decl
== error_mark_node
2754 || diagnostic_report_warnings_p (global_dc
,
2755 DECL_SOURCE_LOCATION (b
->decl
))))
2757 tree old_decl
= b
->decl
;
2758 bool warned
= false;
2760 if (old_decl
== error_mark_node
)
2762 warning (OPT_Wshadow
, "declaration of %q+D shadows previous "
2763 "non-variable", new_decl
);
2766 else if (TREE_CODE (old_decl
) == PARM_DECL
)
2767 warned
= warning (OPT_Wshadow
,
2768 "declaration of %q+D shadows a parameter",
2770 else if (DECL_FILE_SCOPE_P (old_decl
))
2772 /* Do not warn if a variable shadows a function, unless
2773 the variable is a function or a pointer-to-function. */
2774 if (TREE_CODE (old_decl
) == FUNCTION_DECL
2775 && TREE_CODE (new_decl
) != FUNCTION_DECL
2776 && !FUNCTION_POINTER_TYPE_P (TREE_TYPE (new_decl
)))
2779 warned
= warning_at (DECL_SOURCE_LOCATION (new_decl
), OPT_Wshadow
,
2780 "declaration of %qD shadows a global "
2784 else if (TREE_CODE (old_decl
) == FUNCTION_DECL
2785 && DECL_BUILT_IN (old_decl
))
2787 warning (OPT_Wshadow
, "declaration of %q+D shadows "
2788 "a built-in function", new_decl
);
2792 warned
= warning (OPT_Wshadow
, "declaration of %q+D shadows a "
2793 "previous local", new_decl
);
2796 inform (DECL_SOURCE_LOCATION (old_decl
),
2797 "shadowed declaration is here");
2803 /* Record a decl-node X as belonging to the current lexical scope.
2804 Check for errors (such as an incompatible declaration for the same
2805 name already seen in the same scope).
2807 Returns either X or an old decl for the same name.
2808 If an old decl is returned, it may have been smashed
2809 to agree with what X says. */
2814 tree name
= DECL_NAME (x
);
2815 struct c_scope
*scope
= current_scope
;
2816 struct c_binding
*b
;
2817 bool nested
= false;
2818 location_t locus
= DECL_SOURCE_LOCATION (x
);
2820 /* Must set DECL_CONTEXT for everything not at file scope or
2821 DECL_FILE_SCOPE_P won't work. Local externs don't count
2822 unless they have initializers (which generate code). */
2823 if (current_function_decl
2824 && (!VAR_OR_FUNCTION_DECL_P (x
)
2825 || DECL_INITIAL (x
) || !DECL_EXTERNAL (x
)))
2826 DECL_CONTEXT (x
) = current_function_decl
;
2828 /* Anonymous decls are just inserted in the scope. */
2831 bind (name
, x
, scope
, /*invisible=*/false, /*nested=*/false,
2836 /* First, see if there is another declaration with the same name in
2837 the current scope. If there is, duplicate_decls may do all the
2838 work for us. If duplicate_decls returns false, that indicates
2839 two incompatible decls in the same scope; we are to silently
2840 replace the old one (duplicate_decls has issued all appropriate
2841 diagnostics). In particular, we should not consider possible
2842 duplicates in the external scope, or shadowing. */
2843 b
= I_SYMBOL_BINDING (name
);
2844 if (b
&& B_IN_SCOPE (b
, scope
))
2846 struct c_binding
*b_ext
, *b_use
;
2847 tree type
= TREE_TYPE (x
);
2848 tree visdecl
= b
->decl
;
2849 tree vistype
= TREE_TYPE (visdecl
);
2850 if (TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
2851 && COMPLETE_TYPE_P (TREE_TYPE (x
)))
2852 b
->inner_comp
= false;
2855 /* If this is an external linkage declaration, we should check
2856 for compatibility with the type in the external scope before
2857 setting the type at this scope based on the visible
2858 information only. */
2859 if (TREE_PUBLIC (x
) && TREE_PUBLIC (visdecl
))
2861 while (b_ext
&& !B_IN_EXTERNAL_SCOPE (b_ext
))
2862 b_ext
= b_ext
->shadowed
;
2867 TREE_TYPE (b_use
->decl
) = b_use
->u
.type
;
2870 if (duplicate_decls (x
, b_use
->decl
))
2874 /* Save the updated type in the external scope and
2875 restore the proper type for this scope. */
2877 if (comptypes (vistype
, type
))
2878 thistype
= composite_type (vistype
, type
);
2880 thistype
= TREE_TYPE (b_use
->decl
);
2881 b_use
->u
.type
= TREE_TYPE (b_use
->decl
);
2882 if (TREE_CODE (b_use
->decl
) == FUNCTION_DECL
2883 && DECL_BUILT_IN (b_use
->decl
))
2885 = build_type_attribute_variant (thistype
,
2888 TREE_TYPE (b_use
->decl
) = thistype
;
2893 goto skip_external_and_shadow_checks
;
2896 /* All declarations with external linkage, and all external
2897 references, go in the external scope, no matter what scope is
2898 current. However, the binding in that scope is ignored for
2899 purposes of normal name lookup. A separate binding structure is
2900 created in the requested scope; this governs the normal
2901 visibility of the symbol.
2903 The binding in the externals scope is used exclusively for
2904 detecting duplicate declarations of the same object, no matter
2905 what scope they are in; this is what we do here. (C99 6.2.7p2:
2906 All declarations that refer to the same object or function shall
2907 have compatible type; otherwise, the behavior is undefined.) */
2908 if (DECL_EXTERNAL (x
) || scope
== file_scope
)
2910 tree type
= TREE_TYPE (x
);
2913 bool type_saved
= false;
2914 if (b
&& !B_IN_EXTERNAL_SCOPE (b
)
2915 && VAR_OR_FUNCTION_DECL_P (b
->decl
)
2916 && DECL_FILE_SCOPE_P (b
->decl
))
2919 vistype
= TREE_TYPE (visdecl
);
2921 if (scope
!= file_scope
2922 && !DECL_IN_SYSTEM_HEADER (x
))
2923 warning (OPT_Wnested_externs
, "nested extern declaration of %qD", x
);
2925 while (b
&& !B_IN_EXTERNAL_SCOPE (b
))
2927 /* If this decl might be modified, save its type. This is
2928 done here rather than when the decl is first bound
2929 because the type may change after first binding, through
2930 being completed or through attributes being added. If we
2931 encounter multiple such decls, only the first should have
2932 its type saved; the others will already have had their
2933 proper types saved and the types will not have changed as
2934 their scopes will not have been re-entered. */
2935 if (DECL_P (b
->decl
) && DECL_FILE_SCOPE_P (b
->decl
) && !type_saved
)
2937 b
->u
.type
= TREE_TYPE (b
->decl
);
2940 if (B_IN_FILE_SCOPE (b
)
2942 && TREE_STATIC (b
->decl
)
2943 && TREE_CODE (TREE_TYPE (b
->decl
)) == ARRAY_TYPE
2944 && !TYPE_DOMAIN (TREE_TYPE (b
->decl
))
2945 && TREE_CODE (type
) == ARRAY_TYPE
2946 && TYPE_DOMAIN (type
)
2947 && TYPE_MAX_VALUE (TYPE_DOMAIN (type
))
2948 && !integer_zerop (TYPE_MAX_VALUE (TYPE_DOMAIN (type
))))
2950 /* Array type completed in inner scope, which should be
2951 diagnosed if the completion does not have size 1 and
2952 it does not get completed in the file scope. */
2953 b
->inner_comp
= true;
2958 /* If a matching external declaration has been found, set its
2959 type to the composite of all the types of that declaration.
2960 After the consistency checks, it will be reset to the
2961 composite of the visible types only. */
2962 if (b
&& (TREE_PUBLIC (x
) || same_translation_unit_p (x
, b
->decl
))
2964 TREE_TYPE (b
->decl
) = b
->u
.type
;
2966 /* The point of the same_translation_unit_p check here is,
2967 we want to detect a duplicate decl for a construct like
2968 foo() { extern bar(); } ... static bar(); but not if
2969 they are in different translation units. In any case,
2970 the static does not go in the externals scope. */
2972 && (TREE_PUBLIC (x
) || same_translation_unit_p (x
, b
->decl
))
2973 && duplicate_decls (x
, b
->decl
))
2978 if (comptypes (vistype
, type
))
2979 thistype
= composite_type (vistype
, type
);
2981 thistype
= TREE_TYPE (b
->decl
);
2985 b
->u
.type
= TREE_TYPE (b
->decl
);
2986 if (TREE_CODE (b
->decl
) == FUNCTION_DECL
&& DECL_BUILT_IN (b
->decl
))
2988 = build_type_attribute_variant (thistype
,
2989 TYPE_ATTRIBUTES (b
->u
.type
));
2990 TREE_TYPE (b
->decl
) = thistype
;
2991 bind (name
, b
->decl
, scope
, /*invisible=*/false, /*nested=*/true,
2995 else if (TREE_PUBLIC (x
))
2997 if (visdecl
&& !b
&& duplicate_decls (x
, visdecl
))
2999 /* An external declaration at block scope referring to a
3000 visible entity with internal linkage. The composite
3001 type will already be correct for this scope, so we
3002 just need to fall through to make the declaration in
3009 bind (name
, x
, external_scope
, /*invisible=*/true,
3010 /*nested=*/false, locus
);
3016 if (TREE_CODE (x
) != PARM_DECL
)
3017 warn_if_shadowing (x
);
3019 skip_external_and_shadow_checks
:
3020 if (TREE_CODE (x
) == TYPE_DECL
)
3022 /* So this is a typedef, set its underlying type. */
3023 set_underlying_type (x
);
3025 /* If X is a typedef defined in the current function, record it
3026 for the purpose of implementing the -Wunused-local-typedefs
3028 record_locally_defined_typedef (x
);
3031 bind (name
, x
, scope
, /*invisible=*/false, nested
, locus
);
3033 /* If x's type is incomplete because it's based on a
3034 structure or union which has not yet been fully declared,
3035 attach it to that structure or union type, so we can go
3036 back and complete the variable declaration later, if the
3037 structure or union gets fully declared.
3039 If the input is erroneous, we can have error_mark in the type
3040 slot (e.g. "f(void a, ...)") - that doesn't count as an
3042 if (TREE_TYPE (x
) != error_mark_node
3043 && !COMPLETE_TYPE_P (TREE_TYPE (x
)))
3045 tree element
= TREE_TYPE (x
);
3047 while (TREE_CODE (element
) == ARRAY_TYPE
)
3048 element
= TREE_TYPE (element
);
3049 element
= TYPE_MAIN_VARIANT (element
);
3051 if (RECORD_OR_UNION_TYPE_P (element
)
3052 && (TREE_CODE (x
) != TYPE_DECL
3053 || TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
)
3054 && !COMPLETE_TYPE_P (element
))
3055 C_TYPE_INCOMPLETE_VARS (element
)
3056 = tree_cons (NULL_TREE
, x
, C_TYPE_INCOMPLETE_VARS (element
));
3061 /* Record X as belonging to file scope.
3062 This is used only internally by the Objective-C front end,
3063 and is limited to its needs. duplicate_decls is not called;
3064 if there is any preexisting decl for this identifier, it is an ICE. */
3067 pushdecl_top_level (tree x
)
3070 bool nested
= false;
3071 gcc_assert (VAR_P (x
) || TREE_CODE (x
) == CONST_DECL
);
3073 name
= DECL_NAME (x
);
3075 gcc_assert (TREE_CODE (x
) == CONST_DECL
|| !I_SYMBOL_BINDING (name
));
3077 if (TREE_PUBLIC (x
))
3079 bind (name
, x
, external_scope
, /*invisible=*/true, /*nested=*/false,
3084 bind (name
, x
, file_scope
, /*invisible=*/false, nested
, UNKNOWN_LOCATION
);
3090 implicit_decl_warning (location_t loc
, tree id
, tree olddecl
)
3092 if (warn_implicit_function_declaration
)
3097 warned
= pedwarn (loc
, OPT_Wimplicit_function_declaration
,
3098 "implicit declaration of function %qE", id
);
3100 warned
= warning_at (loc
, OPT_Wimplicit_function_declaration
,
3101 G_("implicit declaration of function %qE"), id
);
3102 if (olddecl
&& warned
)
3103 locate_old_decl (olddecl
);
3107 /* This function represents mapping of a function code FCODE
3108 to its respective header. */
3111 header_for_builtin_fn (enum built_in_function fcode
)
3115 CASE_FLT_FN (BUILT_IN_ACOS
):
3116 CASE_FLT_FN (BUILT_IN_ACOSH
):
3117 CASE_FLT_FN (BUILT_IN_ASIN
):
3118 CASE_FLT_FN (BUILT_IN_ASINH
):
3119 CASE_FLT_FN (BUILT_IN_ATAN
):
3120 CASE_FLT_FN (BUILT_IN_ATANH
):
3121 CASE_FLT_FN (BUILT_IN_ATAN2
):
3122 CASE_FLT_FN (BUILT_IN_CBRT
):
3123 CASE_FLT_FN (BUILT_IN_CEIL
):
3124 CASE_FLT_FN (BUILT_IN_COPYSIGN
):
3125 CASE_FLT_FN (BUILT_IN_COS
):
3126 CASE_FLT_FN (BUILT_IN_COSH
):
3127 CASE_FLT_FN (BUILT_IN_ERF
):
3128 CASE_FLT_FN (BUILT_IN_ERFC
):
3129 CASE_FLT_FN (BUILT_IN_EXP
):
3130 CASE_FLT_FN (BUILT_IN_EXP2
):
3131 CASE_FLT_FN (BUILT_IN_EXPM1
):
3132 CASE_FLT_FN (BUILT_IN_FABS
):
3133 CASE_FLT_FN (BUILT_IN_FDIM
):
3134 CASE_FLT_FN (BUILT_IN_FLOOR
):
3135 CASE_FLT_FN (BUILT_IN_FMA
):
3136 CASE_FLT_FN (BUILT_IN_FMAX
):
3137 CASE_FLT_FN (BUILT_IN_FMIN
):
3138 CASE_FLT_FN (BUILT_IN_FMOD
):
3139 CASE_FLT_FN (BUILT_IN_FREXP
):
3140 CASE_FLT_FN (BUILT_IN_HYPOT
):
3141 CASE_FLT_FN (BUILT_IN_ILOGB
):
3142 CASE_FLT_FN (BUILT_IN_LDEXP
):
3143 CASE_FLT_FN (BUILT_IN_LGAMMA
):
3144 CASE_FLT_FN (BUILT_IN_LLRINT
):
3145 CASE_FLT_FN (BUILT_IN_LLROUND
):
3146 CASE_FLT_FN (BUILT_IN_LOG
):
3147 CASE_FLT_FN (BUILT_IN_LOG10
):
3148 CASE_FLT_FN (BUILT_IN_LOG1P
):
3149 CASE_FLT_FN (BUILT_IN_LOG2
):
3150 CASE_FLT_FN (BUILT_IN_LOGB
):
3151 CASE_FLT_FN (BUILT_IN_LRINT
):
3152 CASE_FLT_FN (BUILT_IN_LROUND
):
3153 CASE_FLT_FN (BUILT_IN_MODF
):
3154 CASE_FLT_FN (BUILT_IN_NAN
):
3155 CASE_FLT_FN (BUILT_IN_NEARBYINT
):
3156 CASE_FLT_FN (BUILT_IN_NEXTAFTER
):
3157 CASE_FLT_FN (BUILT_IN_NEXTTOWARD
):
3158 CASE_FLT_FN (BUILT_IN_POW
):
3159 CASE_FLT_FN (BUILT_IN_REMAINDER
):
3160 CASE_FLT_FN (BUILT_IN_REMQUO
):
3161 CASE_FLT_FN (BUILT_IN_RINT
):
3162 CASE_FLT_FN (BUILT_IN_ROUND
):
3163 CASE_FLT_FN (BUILT_IN_SCALBLN
):
3164 CASE_FLT_FN (BUILT_IN_SCALBN
):
3165 CASE_FLT_FN (BUILT_IN_SIN
):
3166 CASE_FLT_FN (BUILT_IN_SINH
):
3167 CASE_FLT_FN (BUILT_IN_SINCOS
):
3168 CASE_FLT_FN (BUILT_IN_SQRT
):
3169 CASE_FLT_FN (BUILT_IN_TAN
):
3170 CASE_FLT_FN (BUILT_IN_TANH
):
3171 CASE_FLT_FN (BUILT_IN_TGAMMA
):
3172 CASE_FLT_FN (BUILT_IN_TRUNC
):
3173 case BUILT_IN_ISINF
:
3174 case BUILT_IN_ISNAN
:
3176 CASE_FLT_FN (BUILT_IN_CABS
):
3177 CASE_FLT_FN (BUILT_IN_CACOS
):
3178 CASE_FLT_FN (BUILT_IN_CACOSH
):
3179 CASE_FLT_FN (BUILT_IN_CARG
):
3180 CASE_FLT_FN (BUILT_IN_CASIN
):
3181 CASE_FLT_FN (BUILT_IN_CASINH
):
3182 CASE_FLT_FN (BUILT_IN_CATAN
):
3183 CASE_FLT_FN (BUILT_IN_CATANH
):
3184 CASE_FLT_FN (BUILT_IN_CCOS
):
3185 CASE_FLT_FN (BUILT_IN_CCOSH
):
3186 CASE_FLT_FN (BUILT_IN_CEXP
):
3187 CASE_FLT_FN (BUILT_IN_CIMAG
):
3188 CASE_FLT_FN (BUILT_IN_CLOG
):
3189 CASE_FLT_FN (BUILT_IN_CONJ
):
3190 CASE_FLT_FN (BUILT_IN_CPOW
):
3191 CASE_FLT_FN (BUILT_IN_CPROJ
):
3192 CASE_FLT_FN (BUILT_IN_CREAL
):
3193 CASE_FLT_FN (BUILT_IN_CSIN
):
3194 CASE_FLT_FN (BUILT_IN_CSINH
):
3195 CASE_FLT_FN (BUILT_IN_CSQRT
):
3196 CASE_FLT_FN (BUILT_IN_CTAN
):
3197 CASE_FLT_FN (BUILT_IN_CTANH
):
3198 return "<complex.h>";
3199 case BUILT_IN_MEMCHR
:
3200 case BUILT_IN_MEMCMP
:
3201 case BUILT_IN_MEMCPY
:
3202 case BUILT_IN_MEMMOVE
:
3203 case BUILT_IN_MEMSET
:
3204 case BUILT_IN_STRCAT
:
3205 case BUILT_IN_STRCHR
:
3206 case BUILT_IN_STRCMP
:
3207 case BUILT_IN_STRCPY
:
3208 case BUILT_IN_STRCSPN
:
3209 case BUILT_IN_STRLEN
:
3210 case BUILT_IN_STRNCAT
:
3211 case BUILT_IN_STRNCMP
:
3212 case BUILT_IN_STRNCPY
:
3213 case BUILT_IN_STRPBRK
:
3214 case BUILT_IN_STRRCHR
:
3215 case BUILT_IN_STRSPN
:
3216 case BUILT_IN_STRSTR
:
3217 return "<string.h>";
3218 case BUILT_IN_FPRINTF
:
3220 case BUILT_IN_FPUTC
:
3221 case BUILT_IN_FPUTS
:
3222 case BUILT_IN_FSCANF
:
3223 case BUILT_IN_FWRITE
:
3224 case BUILT_IN_PRINTF
:
3225 case BUILT_IN_PUTCHAR
:
3227 case BUILT_IN_SCANF
:
3228 case BUILT_IN_SNPRINTF
:
3229 case BUILT_IN_SPRINTF
:
3230 case BUILT_IN_SSCANF
:
3231 case BUILT_IN_VFPRINTF
:
3232 case BUILT_IN_VFSCANF
:
3233 case BUILT_IN_VPRINTF
:
3234 case BUILT_IN_VSCANF
:
3235 case BUILT_IN_VSNPRINTF
:
3236 case BUILT_IN_VSPRINTF
:
3237 case BUILT_IN_VSSCANF
:
3239 case BUILT_IN_ISALNUM
:
3240 case BUILT_IN_ISALPHA
:
3241 case BUILT_IN_ISBLANK
:
3242 case BUILT_IN_ISCNTRL
:
3243 case BUILT_IN_ISDIGIT
:
3244 case BUILT_IN_ISGRAPH
:
3245 case BUILT_IN_ISLOWER
:
3246 case BUILT_IN_ISPRINT
:
3247 case BUILT_IN_ISPUNCT
:
3248 case BUILT_IN_ISSPACE
:
3249 case BUILT_IN_ISUPPER
:
3250 case BUILT_IN_ISXDIGIT
:
3251 case BUILT_IN_TOLOWER
:
3252 case BUILT_IN_TOUPPER
:
3254 case BUILT_IN_ISWALNUM
:
3255 case BUILT_IN_ISWALPHA
:
3256 case BUILT_IN_ISWBLANK
:
3257 case BUILT_IN_ISWCNTRL
:
3258 case BUILT_IN_ISWDIGIT
:
3259 case BUILT_IN_ISWGRAPH
:
3260 case BUILT_IN_ISWLOWER
:
3261 case BUILT_IN_ISWPRINT
:
3262 case BUILT_IN_ISWPUNCT
:
3263 case BUILT_IN_ISWSPACE
:
3264 case BUILT_IN_ISWUPPER
:
3265 case BUILT_IN_ISWXDIGIT
:
3266 case BUILT_IN_TOWLOWER
:
3267 case BUILT_IN_TOWUPPER
:
3268 return "<wctype.h>";
3269 case BUILT_IN_ABORT
:
3271 case BUILT_IN_CALLOC
:
3275 case BUILT_IN_LLABS
:
3276 case BUILT_IN_MALLOC
:
3277 case BUILT_IN_REALLOC
:
3278 case BUILT_IN__EXIT2
:
3279 case BUILT_IN_ALIGNED_ALLOC
:
3280 return "<stdlib.h>";
3281 case BUILT_IN_IMAXABS
:
3282 return "<inttypes.h>";
3283 case BUILT_IN_STRFTIME
:
3290 /* Generate an implicit declaration for identifier FUNCTIONID at LOC as a
3291 function of type int (). */
3294 implicitly_declare (location_t loc
, tree functionid
)
3296 struct c_binding
*b
;
3300 for (b
= I_SYMBOL_BINDING (functionid
); b
; b
= b
->shadowed
)
3302 if (B_IN_SCOPE (b
, external_scope
))
3311 if (decl
== error_mark_node
)
3314 /* FIXME: Objective-C has weird not-really-builtin functions
3315 which are supposed to be visible automatically. They wind up
3316 in the external scope because they're pushed before the file
3317 scope gets created. Catch this here and rebind them into the
3319 if (!DECL_BUILT_IN (decl
) && DECL_IS_BUILTIN (decl
))
3321 bind (functionid
, decl
, file_scope
,
3322 /*invisible=*/false, /*nested=*/true,
3323 DECL_SOURCE_LOCATION (decl
));
3328 tree newtype
= default_function_type
;
3330 TREE_TYPE (decl
) = b
->u
.type
;
3331 /* Implicit declaration of a function already declared
3332 (somehow) in a different scope, or as a built-in.
3333 If this is the first time this has happened, warn;
3334 then recycle the old declaration but with the new type. */
3335 if (!C_DECL_IMPLICIT (decl
))
3337 implicit_decl_warning (loc
, functionid
, decl
);
3338 C_DECL_IMPLICIT (decl
) = 1;
3340 if (DECL_BUILT_IN (decl
))
3342 newtype
= build_type_attribute_variant (newtype
,
3344 (TREE_TYPE (decl
)));
3345 if (!comptypes (newtype
, TREE_TYPE (decl
)))
3347 bool warned
= warning_at (loc
, 0, "incompatible implicit "
3348 "declaration of built-in "
3349 "function %qD", decl
);
3350 /* See if we can hint which header to include. */
3352 = header_for_builtin_fn (DECL_FUNCTION_CODE (decl
));
3353 if (header
!= NULL
&& warned
)
3354 inform (loc
, "include %qs or provide a declaration of %qD",
3356 newtype
= TREE_TYPE (decl
);
3361 if (!comptypes (newtype
, TREE_TYPE (decl
)))
3363 error_at (loc
, "incompatible implicit declaration of "
3364 "function %qD", decl
);
3365 locate_old_decl (decl
);
3368 b
->u
.type
= TREE_TYPE (decl
);
3369 TREE_TYPE (decl
) = newtype
;
3370 bind (functionid
, decl
, current_scope
,
3371 /*invisible=*/false, /*nested=*/true,
3372 DECL_SOURCE_LOCATION (decl
));
3377 /* Not seen before. */
3378 decl
= build_decl (loc
, FUNCTION_DECL
, functionid
, default_function_type
);
3379 DECL_EXTERNAL (decl
) = 1;
3380 TREE_PUBLIC (decl
) = 1;
3381 C_DECL_IMPLICIT (decl
) = 1;
3382 implicit_decl_warning (loc
, functionid
, 0);
3383 asmspec_tree
= maybe_apply_renaming_pragma (decl
, /*asmname=*/NULL
);
3385 set_user_assembler_name (decl
, TREE_STRING_POINTER (asmspec_tree
));
3387 /* C89 says implicit declarations are in the innermost block.
3388 So we record the decl in the standard fashion. */
3389 decl
= pushdecl (decl
);
3391 /* No need to call objc_check_decl here - it's a function type. */
3392 rest_of_decl_compilation (decl
, 0, 0);
3394 /* Write a record describing this implicit function declaration
3395 to the prototypes file (if requested). */
3396 gen_aux_info_record (decl
, 0, 1, 0);
3398 /* Possibly apply some default attributes to this implicit declaration. */
3399 decl_attributes (&decl
, NULL_TREE
, 0);
3404 /* Issue an error message for a reference to an undeclared variable
3405 ID, including a reference to a builtin outside of function-call
3406 context. Establish a binding of the identifier to error_mark_node
3407 in an appropriate scope, which will suppress further errors for the
3408 same identifier. The error message should be given location LOC. */
3410 undeclared_variable (location_t loc
, tree id
)
3412 static bool already
= false;
3413 struct c_scope
*scope
;
3415 if (current_function_decl
== 0)
3417 error_at (loc
, "%qE undeclared here (not in a function)", id
);
3418 scope
= current_scope
;
3422 if (!objc_diagnose_private_ivar (id
))
3423 error_at (loc
, "%qE undeclared (first use in this function)", id
);
3426 inform (loc
, "each undeclared identifier is reported only"
3427 " once for each function it appears in");
3431 /* If we are parsing old-style parameter decls, current_function_decl
3432 will be nonnull but current_function_scope will be null. */
3433 scope
= current_function_scope
? current_function_scope
: current_scope
;
3435 bind (id
, error_mark_node
, scope
, /*invisible=*/false, /*nested=*/false,
3439 /* Subroutine of lookup_label, declare_label, define_label: construct a
3440 LABEL_DECL with all the proper frills. Also create a struct
3441 c_label_vars initialized for the current scope. */
3444 make_label (location_t location
, tree name
, bool defining
,
3445 struct c_label_vars
**p_label_vars
)
3447 tree label
= build_decl (location
, LABEL_DECL
, name
, void_type_node
);
3448 DECL_CONTEXT (label
) = current_function_decl
;
3449 DECL_MODE (label
) = VOIDmode
;
3451 c_label_vars
*label_vars
= ggc_alloc
<c_label_vars
> ();
3452 label_vars
->shadowed
= NULL
;
3453 set_spot_bindings (&label_vars
->label_bindings
, defining
);
3454 label_vars
->decls_in_scope
= make_tree_vector ();
3455 label_vars
->gotos
= NULL
;
3456 *p_label_vars
= label_vars
;
3461 /* Get the LABEL_DECL corresponding to identifier NAME as a label.
3462 Create one if none exists so far for the current function.
3463 This is called when a label is used in a goto expression or
3464 has its address taken. */
3467 lookup_label (tree name
)
3470 struct c_label_vars
*label_vars
;
3472 if (current_function_scope
== 0)
3474 error ("label %qE referenced outside of any function", name
);
3478 /* Use a label already defined or ref'd with this name, but not if
3479 it is inherited from a containing function and wasn't declared
3481 label
= I_LABEL_DECL (name
);
3482 if (label
&& (DECL_CONTEXT (label
) == current_function_decl
3483 || C_DECLARED_LABEL_FLAG (label
)))
3485 /* If the label has only been declared, update its apparent
3486 location to point here, for better diagnostics if it
3487 turns out not to have been defined. */
3488 if (DECL_INITIAL (label
) == NULL_TREE
)
3489 DECL_SOURCE_LOCATION (label
) = input_location
;
3493 /* No label binding for that identifier; make one. */
3494 label
= make_label (input_location
, name
, false, &label_vars
);
3496 /* Ordinary labels go in the current function scope. */
3497 bind_label (name
, label
, current_function_scope
, label_vars
);
3502 /* Issue a warning about DECL for a goto statement at GOTO_LOC going
3506 warn_about_goto (location_t goto_loc
, tree label
, tree decl
)
3508 if (variably_modified_type_p (TREE_TYPE (decl
), NULL_TREE
))
3510 "jump into scope of identifier with variably modified type");
3512 warning_at (goto_loc
, OPT_Wjump_misses_init
,
3513 "jump skips variable initialization");
3514 inform (DECL_SOURCE_LOCATION (label
), "label %qD defined here", label
);
3515 inform (DECL_SOURCE_LOCATION (decl
), "%qD declared here", decl
);
3518 /* Look up a label because of a goto statement. This is like
3519 lookup_label, but also issues any appropriate warnings. */
3522 lookup_label_for_goto (location_t loc
, tree name
)
3525 struct c_label_vars
*label_vars
;
3529 label
= lookup_label (name
);
3530 if (label
== NULL_TREE
)
3533 /* If we are jumping to a different function, we can't issue any
3535 if (DECL_CONTEXT (label
) != current_function_decl
)
3537 gcc_assert (C_DECLARED_LABEL_FLAG (label
));
3541 label_vars
= I_LABEL_BINDING (name
)->u
.label
;
3543 /* If the label has not yet been defined, then push this goto on a
3544 list for possible later warnings. */
3545 if (label_vars
->label_bindings
.scope
== NULL
)
3547 c_goto_bindings
*g
= ggc_alloc
<c_goto_bindings
> ();
3550 set_spot_bindings (&g
->goto_bindings
, true);
3551 vec_safe_push (label_vars
->gotos
, g
);
3555 /* If there are any decls in label_vars->decls_in_scope, then this
3556 goto has missed the declaration of the decl. This happens for a
3562 Issue a warning or error. */
3563 FOR_EACH_VEC_SAFE_ELT (label_vars
->decls_in_scope
, ix
, decl
)
3564 warn_about_goto (loc
, label
, decl
);
3566 if (label_vars
->label_bindings
.left_stmt_expr
)
3568 error_at (loc
, "jump into statement expression");
3569 inform (DECL_SOURCE_LOCATION (label
), "label %qD defined here", label
);
3575 /* Make a label named NAME in the current function, shadowing silently
3576 any that may be inherited from containing functions or containing
3577 scopes. This is called for __label__ declarations. */
3580 declare_label (tree name
)
3582 struct c_binding
*b
= I_LABEL_BINDING (name
);
3584 struct c_label_vars
*label_vars
;
3586 /* Check to make sure that the label hasn't already been declared
3588 if (b
&& B_IN_CURRENT_SCOPE (b
))
3590 error ("duplicate label declaration %qE", name
);
3591 locate_old_decl (b
->decl
);
3593 /* Just use the previous declaration. */
3597 label
= make_label (input_location
, name
, false, &label_vars
);
3598 C_DECLARED_LABEL_FLAG (label
) = 1;
3600 /* Declared labels go in the current scope. */
3601 bind_label (name
, label
, current_scope
, label_vars
);
3606 /* When we define a label, issue any appropriate warnings if there are
3607 any gotos earlier in the function which jump to this label. */
3610 check_earlier_gotos (tree label
, struct c_label_vars
* label_vars
)
3613 struct c_goto_bindings
*g
;
3615 FOR_EACH_VEC_SAFE_ELT (label_vars
->gotos
, ix
, g
)
3617 struct c_binding
*b
;
3618 struct c_scope
*scope
;
3620 /* We have a goto to this label. The goto is going forward. In
3621 g->scope, the goto is going to skip any binding which was
3622 defined after g->bindings_in_scope. */
3623 if (g
->goto_bindings
.scope
->has_jump_unsafe_decl
)
3625 for (b
= g
->goto_bindings
.scope
->bindings
;
3626 b
!= g
->goto_bindings
.bindings_in_scope
;
3629 if (decl_jump_unsafe (b
->decl
))
3630 warn_about_goto (g
->loc
, label
, b
->decl
);
3634 /* We also need to warn about decls defined in any scopes
3635 between the scope of the label and the scope of the goto. */
3636 for (scope
= label_vars
->label_bindings
.scope
;
3637 scope
!= g
->goto_bindings
.scope
;
3638 scope
= scope
->outer
)
3640 gcc_assert (scope
!= NULL
);
3641 if (scope
->has_jump_unsafe_decl
)
3643 if (scope
== label_vars
->label_bindings
.scope
)
3644 b
= label_vars
->label_bindings
.bindings_in_scope
;
3646 b
= scope
->bindings
;
3647 for (; b
!= NULL
; b
= b
->prev
)
3649 if (decl_jump_unsafe (b
->decl
))
3650 warn_about_goto (g
->loc
, label
, b
->decl
);
3655 if (g
->goto_bindings
.stmt_exprs
> 0)
3657 error_at (g
->loc
, "jump into statement expression");
3658 inform (DECL_SOURCE_LOCATION (label
), "label %qD defined here",
3663 /* Now that the label is defined, we will issue warnings about
3664 subsequent gotos to this label when we see them. */
3665 vec_safe_truncate (label_vars
->gotos
, 0);
3666 label_vars
->gotos
= NULL
;
3669 /* Define a label, specifying the location in the source file.
3670 Return the LABEL_DECL node for the label, if the definition is valid.
3671 Otherwise return 0. */
3674 define_label (location_t location
, tree name
)
3676 /* Find any preexisting label with this name. It is an error
3677 if that label has already been defined in this function, or
3678 if there is a containing function with a declared label with
3680 tree label
= I_LABEL_DECL (name
);
3683 && ((DECL_CONTEXT (label
) == current_function_decl
3684 && DECL_INITIAL (label
) != 0)
3685 || (DECL_CONTEXT (label
) != current_function_decl
3686 && C_DECLARED_LABEL_FLAG (label
))))
3688 error_at (location
, "duplicate label %qD", label
);
3689 locate_old_decl (label
);
3692 else if (label
&& DECL_CONTEXT (label
) == current_function_decl
)
3694 struct c_label_vars
*label_vars
= I_LABEL_BINDING (name
)->u
.label
;
3696 /* The label has been used or declared already in this function,
3697 but not defined. Update its location to point to this
3699 DECL_SOURCE_LOCATION (label
) = location
;
3700 set_spot_bindings (&label_vars
->label_bindings
, true);
3702 /* Issue warnings as required about any goto statements from
3703 earlier in the function. */
3704 check_earlier_gotos (label
, label_vars
);
3708 struct c_label_vars
*label_vars
;
3710 /* No label binding for that identifier; make one. */
3711 label
= make_label (location
, name
, true, &label_vars
);
3713 /* Ordinary labels go in the current function scope. */
3714 bind_label (name
, label
, current_function_scope
, label_vars
);
3717 if (!in_system_header_at (input_location
) && lookup_name (name
))
3718 warning_at (location
, OPT_Wtraditional
,
3719 "traditional C lacks a separate namespace "
3720 "for labels, identifier %qE conflicts", name
);
3722 /* Mark label as having been defined. */
3723 DECL_INITIAL (label
) = error_mark_node
;
3727 /* Get the bindings for a new switch statement. This is used to issue
3728 warnings as appropriate for jumps from the switch to case or
3731 struct c_spot_bindings
*
3732 c_get_switch_bindings (void)
3734 struct c_spot_bindings
*switch_bindings
;
3736 switch_bindings
= XNEW (struct c_spot_bindings
);
3737 set_spot_bindings (switch_bindings
, true);
3738 return switch_bindings
;
3742 c_release_switch_bindings (struct c_spot_bindings
*bindings
)
3744 gcc_assert (bindings
->stmt_exprs
== 0 && !bindings
->left_stmt_expr
);
3748 /* This is called at the point of a case or default label to issue
3749 warnings about decls as needed. It returns true if it found an
3750 error, not just a warning. */
3753 c_check_switch_jump_warnings (struct c_spot_bindings
*switch_bindings
,
3754 location_t switch_loc
, location_t case_loc
)
3757 struct c_scope
*scope
;
3760 for (scope
= current_scope
;
3761 scope
!= switch_bindings
->scope
;
3762 scope
= scope
->outer
)
3764 struct c_binding
*b
;
3766 gcc_assert (scope
!= NULL
);
3768 if (!scope
->has_jump_unsafe_decl
)
3771 for (b
= scope
->bindings
; b
!= NULL
; b
= b
->prev
)
3773 if (decl_jump_unsafe (b
->decl
))
3775 if (variably_modified_type_p (TREE_TYPE (b
->decl
), NULL_TREE
))
3779 ("switch jumps into scope of identifier with "
3780 "variably modified type"));
3783 warning_at (case_loc
, OPT_Wjump_misses_init
,
3784 "switch jumps over variable initialization");
3785 inform (switch_loc
, "switch starts here");
3786 inform (DECL_SOURCE_LOCATION (b
->decl
), "%qD declared here",
3792 if (switch_bindings
->stmt_exprs
> 0)
3795 error_at (case_loc
, "switch jumps into statement expression");
3796 inform (switch_loc
, "switch starts here");
3802 /* Given NAME, an IDENTIFIER_NODE,
3803 return the structure (or union or enum) definition for that name.
3804 If THISLEVEL_ONLY is nonzero, searches only the current_scope.
3805 CODE says which kind of type the caller wants;
3806 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
3807 If PLOC is not NULL and this returns non-null, it sets *PLOC to the
3808 location where the tag was defined.
3809 If the wrong kind of type is found, an error is reported. */
3812 lookup_tag (enum tree_code code
, tree name
, bool thislevel_only
,
3815 struct c_binding
*b
= I_TAG_BINDING (name
);
3816 bool thislevel
= false;
3821 /* We only care about whether it's in this level if
3822 thislevel_only was set or it might be a type clash. */
3823 if (thislevel_only
|| TREE_CODE (b
->decl
) != code
)
3825 /* For our purposes, a tag in the external scope is the same as
3826 a tag in the file scope. (Primarily relevant to Objective-C
3827 and its builtin structure tags, which get pushed before the
3828 file scope is created.) */
3829 if (B_IN_CURRENT_SCOPE (b
)
3830 || (current_scope
== file_scope
&& B_IN_EXTERNAL_SCOPE (b
)))
3834 if (thislevel_only
&& !thislevel
)
3837 if (TREE_CODE (b
->decl
) != code
)
3839 /* Definition isn't the kind we were looking for. */
3840 pending_invalid_xref
= name
;
3841 pending_invalid_xref_location
= input_location
;
3843 /* If in the same binding level as a declaration as a tag
3844 of a different type, this must not be allowed to
3845 shadow that tag, so give the error immediately.
3846 (For example, "struct foo; union foo;" is invalid.) */
3848 pending_xref_error ();
3857 /* Return true if a definition exists for NAME with code CODE. */
3860 tag_exists_p (enum tree_code code
, tree name
)
3862 struct c_binding
*b
= I_TAG_BINDING (name
);
3864 if (b
== NULL
|| b
->decl
== NULL_TREE
)
3866 return TREE_CODE (b
->decl
) == code
;
3869 /* Print an error message now
3870 for a recent invalid struct, union or enum cross reference.
3871 We don't print them immediately because they are not invalid
3872 when used in the `struct foo;' construct for shadowing. */
3875 pending_xref_error (void)
3877 if (pending_invalid_xref
!= 0)
3878 error_at (pending_invalid_xref_location
, "%qE defined as wrong kind of tag",
3879 pending_invalid_xref
);
3880 pending_invalid_xref
= 0;
3884 /* Look up NAME in the current scope and its superiors
3885 in the namespace of variables, functions and typedefs.
3886 Return a ..._DECL node of some kind representing its definition,
3887 or return 0 if it is undefined. */
3890 lookup_name (tree name
)
3892 struct c_binding
*b
= I_SYMBOL_BINDING (name
);
3893 if (b
&& !b
->invisible
)
3895 maybe_record_typedef_use (b
->decl
);
3901 /* Similar to `lookup_name' but look only at the indicated scope. */
3904 lookup_name_in_scope (tree name
, struct c_scope
*scope
)
3906 struct c_binding
*b
;
3908 for (b
= I_SYMBOL_BINDING (name
); b
; b
= b
->shadowed
)
3909 if (B_IN_SCOPE (b
, scope
))
3914 /* Create the predefined scalar types of C,
3915 and some nodes representing standard constants (0, 1, (void *) 0).
3916 Initialize the global scope.
3917 Make definitions for built-in primitive functions. */
3920 c_init_decl_processing (void)
3922 location_t save_loc
= input_location
;
3924 /* Initialize reserved words for parser. */
3927 current_function_decl
= 0;
3929 gcc_obstack_init (&parser_obstack
);
3931 /* Make the externals scope. */
3933 external_scope
= current_scope
;
3935 /* Declarations from c_common_nodes_and_builtins must not be associated
3936 with this input file, lest we get differences between using and not
3937 using preprocessed headers. */
3938 input_location
= BUILTINS_LOCATION
;
3940 c_common_nodes_and_builtins ();
3942 /* In C, comparisons and TRUTH_* expressions have type int. */
3943 truthvalue_type_node
= integer_type_node
;
3944 truthvalue_true_node
= integer_one_node
;
3945 truthvalue_false_node
= integer_zero_node
;
3947 /* Even in C99, which has a real boolean type. */
3948 pushdecl (build_decl (UNKNOWN_LOCATION
, TYPE_DECL
, get_identifier ("_Bool"),
3949 boolean_type_node
));
3951 input_location
= save_loc
;
3953 make_fname_decl
= c_make_fname_decl
;
3954 start_fname_decls ();
3957 /* Create the VAR_DECL at LOC for __FUNCTION__ etc. ID is the name to
3958 give the decl, NAME is the initialization string and TYPE_DEP
3959 indicates whether NAME depended on the type of the function. As we
3960 don't yet implement delayed emission of static data, we mark the
3961 decl as emitted so it is not placed in the output. Anything using
3962 it must therefore pull out the STRING_CST initializer directly.
3966 c_make_fname_decl (location_t loc
, tree id
, int type_dep
)
3968 const char *name
= fname_as_string (type_dep
);
3969 tree decl
, type
, init
;
3970 size_t length
= strlen (name
);
3972 type
= build_array_type (char_type_node
,
3973 build_index_type (size_int (length
)));
3974 type
= c_build_qualified_type (type
, TYPE_QUAL_CONST
);
3976 decl
= build_decl (loc
, VAR_DECL
, id
, type
);
3978 TREE_STATIC (decl
) = 1;
3979 TREE_READONLY (decl
) = 1;
3980 DECL_ARTIFICIAL (decl
) = 1;
3982 init
= build_string (length
+ 1, name
);
3983 free (CONST_CAST (char *, name
));
3984 TREE_TYPE (init
) = type
;
3985 DECL_INITIAL (decl
) = init
;
3987 TREE_USED (decl
) = 1;
3989 if (current_function_decl
3990 /* For invalid programs like this:
3993 const char* p = __FUNCTION__;
3995 the __FUNCTION__ is believed to appear in K&R style function
3996 parameter declarator. In that case we still don't have
3998 && (!seen_error () || current_function_scope
))
4000 DECL_CONTEXT (decl
) = current_function_decl
;
4001 bind (id
, decl
, current_function_scope
,
4002 /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION
);
4005 finish_decl (decl
, loc
, init
, NULL_TREE
, NULL_TREE
);
4011 c_builtin_function (tree decl
)
4013 tree type
= TREE_TYPE (decl
);
4014 tree id
= DECL_NAME (decl
);
4016 const char *name
= IDENTIFIER_POINTER (id
);
4017 C_DECL_BUILTIN_PROTOTYPE (decl
) = prototype_p (type
);
4019 /* Should never be called on a symbol with a preexisting meaning. */
4020 gcc_assert (!I_SYMBOL_BINDING (id
));
4022 bind (id
, decl
, external_scope
, /*invisible=*/true, /*nested=*/false,
4025 /* Builtins in the implementation namespace are made visible without
4026 needing to be explicitly declared. See push_file_scope. */
4027 if (name
[0] == '_' && (name
[1] == '_' || ISUPPER (name
[1])))
4029 DECL_CHAIN (decl
) = visible_builtins
;
4030 visible_builtins
= decl
;
4037 c_builtin_function_ext_scope (tree decl
)
4039 tree type
= TREE_TYPE (decl
);
4040 tree id
= DECL_NAME (decl
);
4042 const char *name
= IDENTIFIER_POINTER (id
);
4043 C_DECL_BUILTIN_PROTOTYPE (decl
) = prototype_p (type
);
4046 bind (id
, decl
, external_scope
, /*invisible=*/false, /*nested=*/false,
4049 /* Builtins in the implementation namespace are made visible without
4050 needing to be explicitly declared. See push_file_scope. */
4051 if (name
[0] == '_' && (name
[1] == '_' || ISUPPER (name
[1])))
4053 DECL_CHAIN (decl
) = visible_builtins
;
4054 visible_builtins
= decl
;
4060 /* Called when a declaration is seen that contains no names to declare.
4061 If its type is a reference to a structure, union or enum inherited
4062 from a containing scope, shadow that tag name for the current scope
4063 with a forward reference.
4064 If its type defines a new named structure or union
4065 or defines an enum, it is valid but we need not do anything here.
4066 Otherwise, it is an error. */
4069 shadow_tag (const struct c_declspecs
*declspecs
)
4071 shadow_tag_warned (declspecs
, 0);
4074 /* WARNED is 1 if we have done a pedwarn, 2 if we have done a warning,
4077 shadow_tag_warned (const struct c_declspecs
*declspecs
, int warned
)
4079 bool found_tag
= false;
4081 if (declspecs
->type
&& !declspecs
->default_int_p
&& !declspecs
->typedef_p
)
4083 tree value
= declspecs
->type
;
4084 enum tree_code code
= TREE_CODE (value
);
4086 if (code
== RECORD_TYPE
|| code
== UNION_TYPE
|| code
== ENUMERAL_TYPE
)
4087 /* Used to test also that TYPE_SIZE (value) != 0.
4088 That caused warning for `struct foo;' at top level in the file. */
4090 tree name
= TYPE_NAME (value
);
4095 if (declspecs
->restrict_p
)
4097 error ("invalid use of %<restrict%>");
4103 if (warned
!= 1 && code
!= ENUMERAL_TYPE
)
4104 /* Empty unnamed enum OK */
4106 pedwarn (input_location
, 0,
4107 "unnamed struct/union that defines no instances");
4111 else if (declspecs
->typespec_kind
!= ctsk_tagdef
4112 && declspecs
->typespec_kind
!= ctsk_tagfirstref
4113 && declspecs
->storage_class
!= csc_none
)
4116 pedwarn (input_location
, 0,
4117 "empty declaration with storage class specifier "
4118 "does not redeclare tag");
4120 pending_xref_error ();
4122 else if (declspecs
->typespec_kind
!= ctsk_tagdef
4123 && declspecs
->typespec_kind
!= ctsk_tagfirstref
4124 && (declspecs
->const_p
4125 || declspecs
->volatile_p
4126 || declspecs
->atomic_p
4127 || declspecs
->restrict_p
4128 || declspecs
->address_space
))
4131 pedwarn (input_location
, 0,
4132 "empty declaration with type qualifier "
4133 "does not redeclare tag");
4135 pending_xref_error ();
4137 else if (declspecs
->typespec_kind
!= ctsk_tagdef
4138 && declspecs
->typespec_kind
!= ctsk_tagfirstref
4139 && declspecs
->alignas_p
)
4142 pedwarn (input_location
, 0,
4143 "empty declaration with %<_Alignas%> "
4144 "does not redeclare tag");
4146 pending_xref_error ();
4150 pending_invalid_xref
= 0;
4151 t
= lookup_tag (code
, name
, true, NULL
);
4155 t
= make_node (code
);
4156 pushtag (input_location
, name
, t
);
4162 if (warned
!= 1 && !in_system_header_at (input_location
))
4164 pedwarn (input_location
, 0,
4165 "useless type name in empty declaration");
4170 else if (warned
!= 1 && !in_system_header_at (input_location
)
4171 && declspecs
->typedef_p
)
4173 pedwarn (input_location
, 0, "useless type name in empty declaration");
4177 pending_invalid_xref
= 0;
4179 if (declspecs
->inline_p
)
4181 error ("%<inline%> in empty declaration");
4185 if (declspecs
->noreturn_p
)
4187 error ("%<_Noreturn%> in empty declaration");
4191 if (current_scope
== file_scope
&& declspecs
->storage_class
== csc_auto
)
4193 error ("%<auto%> in file-scope empty declaration");
4197 if (current_scope
== file_scope
&& declspecs
->storage_class
== csc_register
)
4199 error ("%<register%> in file-scope empty declaration");
4203 if (!warned
&& !in_system_header_at (input_location
)
4204 && declspecs
->storage_class
!= csc_none
)
4206 warning (0, "useless storage class specifier in empty declaration");
4210 if (!warned
&& !in_system_header_at (input_location
) && declspecs
->thread_p
)
4212 warning (0, "useless %qs in empty declaration",
4213 declspecs
->thread_gnu_p
? "__thread" : "_Thread_local");
4218 && !in_system_header_at (input_location
)
4219 && (declspecs
->const_p
4220 || declspecs
->volatile_p
4221 || declspecs
->atomic_p
4222 || declspecs
->restrict_p
4223 || declspecs
->address_space
))
4225 warning (0, "useless type qualifier in empty declaration");
4229 if (!warned
&& !in_system_header_at (input_location
)
4230 && declspecs
->alignas_p
)
4232 warning (0, "useless %<_Alignas%> in empty declaration");
4239 pedwarn (input_location
, 0, "empty declaration");
4244 /* Return the qualifiers from SPECS as a bitwise OR of TYPE_QUAL_*
4245 bits. SPECS represents declaration specifiers that the grammar
4246 only permits to contain type qualifiers and attributes. */
4249 quals_from_declspecs (const struct c_declspecs
*specs
)
4251 int quals
= ((specs
->const_p
? TYPE_QUAL_CONST
: 0)
4252 | (specs
->volatile_p
? TYPE_QUAL_VOLATILE
: 0)
4253 | (specs
->restrict_p
? TYPE_QUAL_RESTRICT
: 0)
4254 | (specs
->atomic_p
? TYPE_QUAL_ATOMIC
: 0)
4255 | (ENCODE_QUAL_ADDR_SPACE (specs
->address_space
)));
4256 gcc_assert (!specs
->type
4257 && !specs
->decl_attr
4258 && specs
->typespec_word
== cts_none
4259 && specs
->storage_class
== csc_none
4260 && !specs
->typedef_p
4261 && !specs
->explicit_signed_p
4262 && !specs
->deprecated_p
4264 && !specs
->long_long_p
4267 && !specs
->unsigned_p
4268 && !specs
->complex_p
4270 && !specs
->noreturn_p
4271 && !specs
->thread_p
);
4275 /* Construct an array declarator. LOC is the location of the
4276 beginning of the array (usually the opening brace). EXPR is the
4277 expression inside [], or NULL_TREE. QUALS are the type qualifiers
4278 inside the [] (to be applied to the pointer to which a parameter
4279 array is converted). STATIC_P is true if "static" is inside the
4280 [], false otherwise. VLA_UNSPEC_P is true if the array is [*], a
4281 VLA of unspecified length which is nevertheless a complete type,
4282 false otherwise. The field for the contained declarator is left to
4283 be filled in by set_array_declarator_inner. */
4285 struct c_declarator
*
4286 build_array_declarator (location_t loc
,
4287 tree expr
, struct c_declspecs
*quals
, bool static_p
,
4290 struct c_declarator
*declarator
= XOBNEW (&parser_obstack
,
4291 struct c_declarator
);
4292 declarator
->id_loc
= loc
;
4293 declarator
->kind
= cdk_array
;
4294 declarator
->declarator
= 0;
4295 declarator
->u
.array
.dimen
= expr
;
4298 declarator
->u
.array
.attrs
= quals
->attrs
;
4299 declarator
->u
.array
.quals
= quals_from_declspecs (quals
);
4303 declarator
->u
.array
.attrs
= NULL_TREE
;
4304 declarator
->u
.array
.quals
= 0;
4306 declarator
->u
.array
.static_p
= static_p
;
4307 declarator
->u
.array
.vla_unspec_p
= vla_unspec_p
;
4308 if (static_p
|| quals
!= NULL
)
4309 pedwarn_c90 (loc
, OPT_Wpedantic
,
4310 "ISO C90 does not support %<static%> or type "
4311 "qualifiers in parameter array declarators");
4313 pedwarn_c90 (loc
, OPT_Wpedantic
,
4314 "ISO C90 does not support %<[*]%> array declarators");
4317 if (!current_scope
->parm_flag
)
4320 error_at (loc
, "%<[*]%> not allowed in other than "
4321 "function prototype scope");
4322 declarator
->u
.array
.vla_unspec_p
= false;
4325 current_scope
->had_vla_unspec
= true;
4330 /* Set the contained declarator of an array declarator. DECL is the
4331 declarator, as constructed by build_array_declarator; INNER is what
4332 appears on the left of the []. */
4334 struct c_declarator
*
4335 set_array_declarator_inner (struct c_declarator
*decl
,
4336 struct c_declarator
*inner
)
4338 decl
->declarator
= inner
;
4342 /* INIT is a constructor that forms DECL's initializer. If the final
4343 element initializes a flexible array field, add the size of that
4344 initializer to DECL's size. */
4347 add_flexible_array_elts_to_size (tree decl
, tree init
)
4351 if (vec_safe_is_empty (CONSTRUCTOR_ELTS (init
)))
4354 elt
= CONSTRUCTOR_ELTS (init
)->last ().value
;
4355 type
= TREE_TYPE (elt
);
4356 if (TREE_CODE (type
) == ARRAY_TYPE
4357 && TYPE_SIZE (type
) == NULL_TREE
4358 && TYPE_DOMAIN (type
) != NULL_TREE
4359 && TYPE_MAX_VALUE (TYPE_DOMAIN (type
)) == NULL_TREE
)
4361 complete_array_type (&type
, elt
, false);
4363 = size_binop (PLUS_EXPR
, DECL_SIZE (decl
), TYPE_SIZE (type
));
4364 DECL_SIZE_UNIT (decl
)
4365 = size_binop (PLUS_EXPR
, DECL_SIZE_UNIT (decl
), TYPE_SIZE_UNIT (type
));
4369 /* Decode a "typename", such as "int **", returning a ..._TYPE node.
4370 Set *EXPR, if EXPR not NULL, to any expression to be evaluated
4371 before the type name, and set *EXPR_CONST_OPERANDS, if
4372 EXPR_CONST_OPERANDS not NULL, to indicate whether the type name may
4373 appear in a constant expression. */
4376 groktypename (struct c_type_name
*type_name
, tree
*expr
,
4377 bool *expr_const_operands
)
4380 tree attrs
= type_name
->specs
->attrs
;
4382 type_name
->specs
->attrs
= NULL_TREE
;
4384 type
= grokdeclarator (type_name
->declarator
, type_name
->specs
, TYPENAME
,
4385 false, NULL
, &attrs
, expr
, expr_const_operands
,
4388 /* Apply attributes. */
4389 decl_attributes (&type
, attrs
, 0);
4394 /* Wrapper for decl_attributes that adds some implicit attributes
4395 to VAR_DECLs or FUNCTION_DECLs. */
4398 c_decl_attributes (tree
*node
, tree attributes
, int flags
)
4400 /* Add implicit "omp declare target" attribute if requested. */
4401 if (current_omp_declare_target_attribute
4402 && ((VAR_P (*node
) && is_global_var (*node
))
4403 || TREE_CODE (*node
) == FUNCTION_DECL
))
4406 && !lang_hooks
.types
.omp_mappable_type (TREE_TYPE (*node
)))
4407 error ("%q+D in declare target directive does not have mappable type",
4410 attributes
= tree_cons (get_identifier ("omp declare target"),
4411 NULL_TREE
, attributes
);
4413 return decl_attributes (node
, attributes
, flags
);
4417 /* Decode a declarator in an ordinary declaration or data definition.
4418 This is called as soon as the type information and variable name
4419 have been parsed, before parsing the initializer if any.
4420 Here we create the ..._DECL node, fill in its type,
4421 and put it on the list of decls for the current context.
4422 The ..._DECL node is returned as the value.
4424 Exception: for arrays where the length is not specified,
4425 the type is left null, to be filled in by `finish_decl'.
4427 Function definitions do not come here; they go to start_function
4428 instead. However, external and forward declarations of functions
4429 do go through here. Structure field declarations are done by
4430 grokfield and not through here. */
4433 start_decl (struct c_declarator
*declarator
, struct c_declspecs
*declspecs
,
4434 bool initialized
, tree attributes
)
4438 tree expr
= NULL_TREE
;
4439 enum deprecated_states deprecated_state
= DEPRECATED_NORMAL
;
4441 /* An object declared as __attribute__((deprecated)) suppresses
4442 warnings of uses of other deprecated items. */
4443 if (lookup_attribute ("deprecated", attributes
))
4444 deprecated_state
= DEPRECATED_SUPPRESS
;
4446 decl
= grokdeclarator (declarator
, declspecs
,
4447 NORMAL
, initialized
, NULL
, &attributes
, &expr
, NULL
,
4449 if (!decl
|| decl
== error_mark_node
)
4453 add_stmt (fold_convert (void_type_node
, expr
));
4455 if (TREE_CODE (decl
) != FUNCTION_DECL
&& MAIN_NAME_P (DECL_NAME (decl
)))
4456 warning (OPT_Wmain
, "%q+D is usually a function", decl
);
4459 /* Is it valid for this decl to have an initializer at all?
4460 If not, set INITIALIZED to zero, which will indirectly
4461 tell 'finish_decl' to ignore the initializer once it is parsed. */
4462 switch (TREE_CODE (decl
))
4465 error ("typedef %qD is initialized (use __typeof__ instead)", decl
);
4470 error ("function %qD is initialized like a variable", decl
);
4475 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
4476 error ("parameter %qD is initialized", decl
);
4481 /* Don't allow initializations for incomplete types except for
4482 arrays which might be completed by the initialization. */
4484 /* This can happen if the array size is an undefined macro.
4485 We already gave a warning, so we don't need another one. */
4486 if (TREE_TYPE (decl
) == error_mark_node
)
4488 else if (COMPLETE_TYPE_P (TREE_TYPE (decl
)))
4490 /* A complete type is ok if size is fixed. */
4492 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl
))) != INTEGER_CST
4493 || C_DECL_VARIABLE_SIZE (decl
))
4495 error ("variable-sized object may not be initialized");
4499 else if (TREE_CODE (TREE_TYPE (decl
)) != ARRAY_TYPE
)
4501 error ("variable %qD has initializer but incomplete type", decl
);
4504 else if (C_DECL_VARIABLE_SIZE (decl
))
4506 /* Although C99 is unclear about whether incomplete arrays
4507 of VLAs themselves count as VLAs, it does not make
4508 sense to permit them to be initialized given that
4509 ordinary VLAs may not be initialized. */
4510 error ("variable-sized object may not be initialized");
4517 if (current_scope
== file_scope
)
4518 TREE_STATIC (decl
) = 1;
4520 /* Tell 'pushdecl' this is an initialized decl
4521 even though we don't yet have the initializer expression.
4522 Also tell 'finish_decl' it may store the real initializer. */
4523 DECL_INITIAL (decl
) = error_mark_node
;
4526 /* If this is a function declaration, write a record describing it to the
4527 prototypes file (if requested). */
4529 if (TREE_CODE (decl
) == FUNCTION_DECL
)
4530 gen_aux_info_record (decl
, 0, 0, prototype_p (TREE_TYPE (decl
)));
4532 /* ANSI specifies that a tentative definition which is not merged with
4533 a non-tentative definition behaves exactly like a definition with an
4534 initializer equal to zero. (Section 3.7.2)
4536 -fno-common gives strict ANSI behavior, though this tends to break
4537 a large body of code that grew up without this rule.
4539 Thread-local variables are never common, since there's no entrenched
4540 body of code to break, and it allows more efficient variable references
4541 in the presence of dynamic linking. */
4545 && TREE_PUBLIC (decl
)
4546 && !DECL_THREAD_LOCAL_P (decl
)
4548 DECL_COMMON (decl
) = 1;
4550 /* Set attributes here so if duplicate decl, will have proper attributes. */
4551 c_decl_attributes (&decl
, attributes
, 0);
4553 /* Handle gnu_inline attribute. */
4554 if (declspecs
->inline_p
4555 && !flag_gnu89_inline
4556 && TREE_CODE (decl
) == FUNCTION_DECL
4557 && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl
))
4558 || current_function_decl
))
4560 if (declspecs
->storage_class
== csc_auto
&& current_scope
!= file_scope
)
4562 else if (declspecs
->storage_class
!= csc_static
)
4563 DECL_EXTERNAL (decl
) = !DECL_EXTERNAL (decl
);
4566 if (TREE_CODE (decl
) == FUNCTION_DECL
4567 && targetm
.calls
.promote_prototypes (TREE_TYPE (decl
)))
4569 struct c_declarator
*ce
= declarator
;
4571 if (ce
->kind
== cdk_pointer
)
4572 ce
= declarator
->declarator
;
4573 if (ce
->kind
== cdk_function
)
4575 tree args
= ce
->u
.arg_info
->parms
;
4576 for (; args
; args
= DECL_CHAIN (args
))
4578 tree type
= TREE_TYPE (args
);
4579 if (type
&& INTEGRAL_TYPE_P (type
)
4580 && TYPE_PRECISION (type
) < TYPE_PRECISION (integer_type_node
))
4581 DECL_ARG_TYPE (args
) = c_type_promotes_to (type
);
4586 if (TREE_CODE (decl
) == FUNCTION_DECL
4587 && DECL_DECLARED_INLINE_P (decl
)
4588 && DECL_UNINLINABLE (decl
)
4589 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl
)))
4590 warning (OPT_Wattributes
, "inline function %q+D given attribute noinline",
4593 /* C99 6.7.4p3: An inline definition of a function with external
4594 linkage shall not contain a definition of a modifiable object
4595 with static storage duration... */
4597 && current_scope
!= file_scope
4598 && TREE_STATIC (decl
)
4599 && !TREE_READONLY (decl
)
4600 && DECL_DECLARED_INLINE_P (current_function_decl
)
4601 && DECL_EXTERNAL (current_function_decl
))
4602 record_inline_static (input_location
, current_function_decl
,
4603 decl
, csi_modifiable
);
4605 if (c_dialect_objc ()
4606 && VAR_OR_FUNCTION_DECL_P (decl
))
4607 objc_check_global_decl (decl
);
4609 /* Add this decl to the current scope.
4610 TEM may equal DECL or it may be a previous decl of the same name. */
4611 tem
= pushdecl (decl
);
4613 if (initialized
&& DECL_EXTERNAL (tem
))
4615 DECL_EXTERNAL (tem
) = 0;
4616 TREE_STATIC (tem
) = 1;
4622 /* Subroutine of finish_decl. TYPE is the type of an uninitialized object
4623 DECL or the non-array element type if DECL is an uninitialized array.
4624 If that type has a const member, diagnose this. */
4627 diagnose_uninitialized_cst_member (tree decl
, tree type
)
4630 for (field
= TYPE_FIELDS (type
); field
; field
= TREE_CHAIN (field
))
4633 if (TREE_CODE (field
) != FIELD_DECL
)
4635 field_type
= strip_array_types (TREE_TYPE (field
));
4637 if (TYPE_QUALS (field_type
) & TYPE_QUAL_CONST
)
4639 warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wc___compat
,
4640 "uninitialized const member in %qT is invalid in C++",
4641 strip_array_types (TREE_TYPE (decl
)));
4642 inform (DECL_SOURCE_LOCATION (field
), "%qD should be initialized", field
);
4645 if (RECORD_OR_UNION_TYPE_P (field_type
))
4646 diagnose_uninitialized_cst_member (decl
, field_type
);
4650 /* Finish processing of a declaration;
4651 install its initial value.
4652 If ORIGTYPE is not NULL_TREE, it is the original type of INIT.
4653 If the length of an array type is not known before,
4654 it must be determined now, from the initial value, or it is an error.
4656 INIT_LOC is the location of the initial value. */
4659 finish_decl (tree decl
, location_t init_loc
, tree init
,
4660 tree origtype
, tree asmspec_tree
)
4663 bool was_incomplete
= (DECL_SIZE (decl
) == 0);
4664 const char *asmspec
= 0;
4666 /* If a name was specified, get the string. */
4667 if (VAR_OR_FUNCTION_DECL_P (decl
)
4668 && DECL_FILE_SCOPE_P (decl
))
4669 asmspec_tree
= maybe_apply_renaming_pragma (decl
, asmspec_tree
);
4671 asmspec
= TREE_STRING_POINTER (asmspec_tree
);
4674 && TREE_STATIC (decl
)
4675 && global_bindings_p ())
4676 /* So decl is a global variable. Record the types it uses
4677 so that we can decide later to emit debug info for them. */
4678 record_types_used_by_current_var_decl (decl
);
4680 /* If `start_decl' didn't like having an initialization, ignore it now. */
4681 if (init
!= 0 && DECL_INITIAL (decl
) == 0)
4684 /* Don't crash if parm is initialized. */
4685 if (TREE_CODE (decl
) == PARM_DECL
)
4689 store_init_value (init_loc
, decl
, init
, origtype
);
4691 if (c_dialect_objc () && (VAR_OR_FUNCTION_DECL_P (decl
)
4692 || TREE_CODE (decl
) == FIELD_DECL
))
4693 objc_check_decl (decl
);
4695 type
= TREE_TYPE (decl
);
4697 /* Deduce size of array from initialization, if not already known. */
4698 if (TREE_CODE (type
) == ARRAY_TYPE
4699 && TYPE_DOMAIN (type
) == 0
4700 && TREE_CODE (decl
) != TYPE_DECL
)
4703 = (TREE_STATIC (decl
)
4704 /* Even if pedantic, an external linkage array
4705 may have incomplete type at first. */
4706 ? pedantic
&& !TREE_PUBLIC (decl
)
4707 : !DECL_EXTERNAL (decl
));
4709 = complete_array_type (&TREE_TYPE (decl
), DECL_INITIAL (decl
),
4712 /* Get the completed type made by complete_array_type. */
4713 type
= TREE_TYPE (decl
);
4718 error ("initializer fails to determine size of %q+D", decl
);
4723 error ("array size missing in %q+D", decl
);
4724 /* If a `static' var's size isn't known,
4725 make it extern as well as static, so it does not get
4727 If it is not `static', then do not mark extern;
4728 finish_incomplete_decl will give it a default size
4729 and it will get allocated. */
4730 else if (!pedantic
&& TREE_STATIC (decl
) && !TREE_PUBLIC (decl
))
4731 DECL_EXTERNAL (decl
) = 1;
4735 error ("zero or negative size array %q+D", decl
);
4739 /* For global variables, update the copy of the type that
4740 exists in the binding. */
4741 if (TREE_PUBLIC (decl
))
4743 struct c_binding
*b_ext
= I_SYMBOL_BINDING (DECL_NAME (decl
));
4744 while (b_ext
&& !B_IN_EXTERNAL_SCOPE (b_ext
))
4745 b_ext
= b_ext
->shadowed
;
4748 if (b_ext
->u
.type
&& comptypes (b_ext
->u
.type
, type
))
4749 b_ext
->u
.type
= composite_type (b_ext
->u
.type
, type
);
4751 b_ext
->u
.type
= type
;
4760 if (DECL_INITIAL (decl
))
4761 TREE_TYPE (DECL_INITIAL (decl
)) = type
;
4763 relayout_decl (decl
);
4768 if (init
&& TREE_CODE (init
) == CONSTRUCTOR
)
4769 add_flexible_array_elts_to_size (decl
, init
);
4771 if (DECL_SIZE (decl
) == 0 && TREE_TYPE (decl
) != error_mark_node
4772 && COMPLETE_TYPE_P (TREE_TYPE (decl
)))
4773 layout_decl (decl
, 0);
4775 if (DECL_SIZE (decl
) == 0
4776 /* Don't give an error if we already gave one earlier. */
4777 && TREE_TYPE (decl
) != error_mark_node
4778 && (TREE_STATIC (decl
)
4779 /* A static variable with an incomplete type
4780 is an error if it is initialized.
4781 Also if it is not file scope.
4782 Otherwise, let it through, but if it is not `extern'
4783 then it may cause an error message later. */
4784 ? (DECL_INITIAL (decl
) != 0
4785 || !DECL_FILE_SCOPE_P (decl
))
4786 /* An automatic variable with an incomplete type
4788 : !DECL_EXTERNAL (decl
)))
4790 error ("storage size of %q+D isn%'t known", decl
);
4791 TREE_TYPE (decl
) = error_mark_node
;
4794 if (is_global_var (decl
) && DECL_SIZE (decl
) != 0)
4796 if (TREE_CODE (DECL_SIZE (decl
)) == INTEGER_CST
)
4797 constant_expression_warning (DECL_SIZE (decl
));
4800 error ("storage size of %q+D isn%'t constant", decl
);
4801 TREE_TYPE (decl
) = error_mark_node
;
4805 if (TREE_USED (type
))
4807 TREE_USED (decl
) = 1;
4808 DECL_READ_P (decl
) = 1;
4812 /* If this is a function and an assembler name is specified, reset DECL_RTL
4813 so we can give it its new name. Also, update builtin_decl if it
4814 was a normal built-in. */
4815 if (TREE_CODE (decl
) == FUNCTION_DECL
&& asmspec
)
4817 if (DECL_BUILT_IN_CLASS (decl
) == BUILT_IN_NORMAL
)
4818 set_builtin_user_assembler_name (decl
, asmspec
);
4819 set_user_assembler_name (decl
, asmspec
);
4822 /* If #pragma weak was used, mark the decl weak now. */
4823 maybe_apply_pragma_weak (decl
);
4825 /* Output the assembler code and/or RTL code for variables and functions,
4826 unless the type is an undefined structure or union.
4827 If not, it will get done when the type is completed. */
4829 if (VAR_OR_FUNCTION_DECL_P (decl
))
4831 /* Determine the ELF visibility. */
4832 if (TREE_PUBLIC (decl
))
4833 c_determine_visibility (decl
);
4835 /* This is a no-op in c-lang.c or something real in objc-act.c. */
4836 if (c_dialect_objc ())
4837 objc_check_decl (decl
);
4841 /* If this is not a static variable, issue a warning.
4842 It doesn't make any sense to give an ASMSPEC for an
4843 ordinary, non-register local variable. Historically,
4844 GCC has accepted -- but ignored -- the ASMSPEC in
4846 if (!DECL_FILE_SCOPE_P (decl
)
4848 && !C_DECL_REGISTER (decl
)
4849 && !TREE_STATIC (decl
))
4850 warning (0, "ignoring asm-specifier for non-static local "
4851 "variable %q+D", decl
);
4853 set_user_assembler_name (decl
, asmspec
);
4856 if (DECL_FILE_SCOPE_P (decl
))
4858 if (DECL_INITIAL (decl
) == NULL_TREE
4859 || DECL_INITIAL (decl
) == error_mark_node
)
4860 /* Don't output anything
4861 when a tentative file-scope definition is seen.
4862 But at end of compilation, do output code for them. */
4863 DECL_DEFER_OUTPUT (decl
) = 1;
4864 if (asmspec
&& C_DECL_REGISTER (decl
))
4865 DECL_HARD_REGISTER (decl
) = 1;
4866 rest_of_decl_compilation (decl
, true, 0);
4870 /* In conjunction with an ASMSPEC, the `register'
4871 keyword indicates that we should place the variable
4872 in a particular register. */
4873 if (asmspec
&& C_DECL_REGISTER (decl
))
4875 DECL_HARD_REGISTER (decl
) = 1;
4876 /* This cannot be done for a structure with volatile
4877 fields, on which DECL_REGISTER will have been
4879 if (!DECL_REGISTER (decl
))
4880 error ("cannot put object with volatile field into register");
4883 if (TREE_CODE (decl
) != FUNCTION_DECL
)
4885 /* If we're building a variable sized type, and we might be
4886 reachable other than via the top of the current binding
4887 level, then create a new BIND_EXPR so that we deallocate
4888 the object at the right time. */
4889 /* Note that DECL_SIZE can be null due to errors. */
4890 if (DECL_SIZE (decl
)
4891 && !TREE_CONSTANT (DECL_SIZE (decl
))
4892 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list
))
4895 bind
= build3 (BIND_EXPR
, void_type_node
, NULL
, NULL
, NULL
);
4896 TREE_SIDE_EFFECTS (bind
) = 1;
4898 BIND_EXPR_BODY (bind
) = push_stmt_list ();
4900 add_stmt (build_stmt (DECL_SOURCE_LOCATION (decl
),
4906 if (!DECL_FILE_SCOPE_P (decl
))
4908 /* Recompute the RTL of a local array now
4909 if it used to be an incomplete type. */
4910 if (was_incomplete
&& !is_global_var (decl
))
4912 /* If we used it already as memory, it must stay in memory. */
4913 TREE_ADDRESSABLE (decl
) = TREE_USED (decl
);
4914 /* If it's still incomplete now, no init will save it. */
4915 if (DECL_SIZE (decl
) == 0)
4916 DECL_INITIAL (decl
) = 0;
4921 if (TREE_CODE (decl
) == TYPE_DECL
)
4923 if (!DECL_FILE_SCOPE_P (decl
)
4924 && variably_modified_type_p (TREE_TYPE (decl
), NULL_TREE
))
4925 add_stmt (build_stmt (DECL_SOURCE_LOCATION (decl
), DECL_EXPR
, decl
));
4927 rest_of_decl_compilation (decl
, DECL_FILE_SCOPE_P (decl
), 0);
4930 /* Install a cleanup (aka destructor) if one was given. */
4931 if (VAR_P (decl
) && !TREE_STATIC (decl
))
4933 tree attr
= lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl
));
4936 tree cleanup_id
= TREE_VALUE (TREE_VALUE (attr
));
4937 tree cleanup_decl
= lookup_name (cleanup_id
);
4939 vec
<tree
, va_gc
> *v
;
4941 /* Build "cleanup(&decl)" for the destructor. */
4942 cleanup
= build_unary_op (input_location
, ADDR_EXPR
, decl
, 0);
4944 v
->quick_push (cleanup
);
4945 cleanup
= c_build_function_call_vec (DECL_SOURCE_LOCATION (decl
),
4946 vNULL
, cleanup_decl
, v
, NULL
);
4949 /* Don't warn about decl unused; the cleanup uses it. */
4950 TREE_USED (decl
) = 1;
4951 TREE_USED (cleanup_decl
) = 1;
4952 DECL_READ_P (decl
) = 1;
4954 push_cleanup (decl
, cleanup
, false);
4960 && !DECL_EXTERNAL (decl
)
4961 && DECL_INITIAL (decl
) == NULL_TREE
)
4963 type
= strip_array_types (type
);
4964 if (TREE_READONLY (decl
))
4965 warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wc___compat
,
4966 "uninitialized const %qD is invalid in C++", decl
);
4967 else if (RECORD_OR_UNION_TYPE_P (type
)
4968 && C_TYPE_FIELDS_READONLY (type
))
4969 diagnose_uninitialized_cst_member (decl
, type
);
4972 invoke_plugin_callbacks (PLUGIN_FINISH_DECL
, decl
);
4975 /* Given a parsed parameter declaration, decode it into a PARM_DECL.
4976 EXPR is NULL or a pointer to an expression that needs to be
4977 evaluated for the side effects of array size expressions in the
4981 grokparm (const struct c_parm
*parm
, tree
*expr
)
4983 tree attrs
= parm
->attrs
;
4984 tree decl
= grokdeclarator (parm
->declarator
, parm
->specs
, PARM
, false,
4985 NULL
, &attrs
, expr
, NULL
, DEPRECATED_NORMAL
);
4987 decl_attributes (&decl
, attrs
, 0);
4992 /* Given a parsed parameter declaration, decode it into a PARM_DECL
4993 and push that on the current scope. EXPR is a pointer to an
4994 expression that needs to be evaluated for the side effects of array
4995 size expressions in the parameters. */
4998 push_parm_decl (const struct c_parm
*parm
, tree
*expr
)
5000 tree attrs
= parm
->attrs
;
5003 decl
= grokdeclarator (parm
->declarator
, parm
->specs
, PARM
, false, NULL
,
5004 &attrs
, expr
, NULL
, DEPRECATED_NORMAL
);
5005 decl_attributes (&decl
, attrs
, 0);
5007 decl
= pushdecl (decl
);
5009 finish_decl (decl
, input_location
, NULL_TREE
, NULL_TREE
, NULL_TREE
);
5012 /* Mark all the parameter declarations to date as forward decls.
5013 Also diagnose use of this extension. */
5016 mark_forward_parm_decls (void)
5018 struct c_binding
*b
;
5020 if (pedantic
&& !current_scope
->warned_forward_parm_decls
)
5022 pedwarn (input_location
, OPT_Wpedantic
,
5023 "ISO C forbids forward parameter declarations");
5024 current_scope
->warned_forward_parm_decls
= true;
5027 for (b
= current_scope
->bindings
; b
; b
= b
->prev
)
5028 if (TREE_CODE (b
->decl
) == PARM_DECL
)
5029 TREE_ASM_WRITTEN (b
->decl
) = 1;
5032 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
5033 literal, which may be an incomplete array type completed by the
5034 initializer; INIT is a CONSTRUCTOR at LOC that initializes the compound
5035 literal. NON_CONST is true if the initializers contain something
5036 that cannot occur in a constant expression. */
5039 build_compound_literal (location_t loc
, tree type
, tree init
, bool non_const
)
5041 /* We do not use start_decl here because we have a type, not a declarator;
5042 and do not use finish_decl because the decl should be stored inside
5043 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_EXPR. */
5048 if (type
== error_mark_node
5049 || init
== error_mark_node
)
5050 return error_mark_node
;
5052 decl
= build_decl (loc
, VAR_DECL
, NULL_TREE
, type
);
5053 DECL_EXTERNAL (decl
) = 0;
5054 TREE_PUBLIC (decl
) = 0;
5055 TREE_STATIC (decl
) = (current_scope
== file_scope
);
5056 DECL_CONTEXT (decl
) = current_function_decl
;
5057 TREE_USED (decl
) = 1;
5058 DECL_READ_P (decl
) = 1;
5059 TREE_TYPE (decl
) = type
;
5060 TREE_READONLY (decl
) = (TYPE_READONLY (type
)
5061 || (TREE_CODE (type
) == ARRAY_TYPE
5062 && TYPE_READONLY (TREE_TYPE (type
))));
5063 store_init_value (loc
, decl
, init
, NULL_TREE
);
5065 if (TREE_CODE (type
) == ARRAY_TYPE
&& !COMPLETE_TYPE_P (type
))
5067 int failure
= complete_array_type (&TREE_TYPE (decl
),
5068 DECL_INITIAL (decl
), true);
5069 /* If complete_array_type returns 3, it means that the
5070 initial value of the compound literal is empty. Allow it. */
5071 gcc_assert (failure
== 0 || failure
== 3);
5073 type
= TREE_TYPE (decl
);
5074 TREE_TYPE (DECL_INITIAL (decl
)) = type
;
5077 if (type
== error_mark_node
|| !COMPLETE_TYPE_P (type
))
5079 c_incomplete_type_error (NULL_TREE
, type
);
5080 return error_mark_node
;
5083 stmt
= build_stmt (DECL_SOURCE_LOCATION (decl
), DECL_EXPR
, decl
);
5084 complit
= build1 (COMPOUND_LITERAL_EXPR
, type
, stmt
);
5085 TREE_SIDE_EFFECTS (complit
) = 1;
5087 layout_decl (decl
, 0);
5089 if (TREE_STATIC (decl
))
5091 /* This decl needs a name for the assembler output. */
5092 set_compound_literal_name (decl
);
5093 DECL_DEFER_OUTPUT (decl
) = 1;
5094 DECL_COMDAT (decl
) = 1;
5095 DECL_ARTIFICIAL (decl
) = 1;
5096 DECL_IGNORED_P (decl
) = 1;
5098 rest_of_decl_compilation (decl
, 1, 0);
5103 complit
= build2 (C_MAYBE_CONST_EXPR
, type
, NULL
, complit
);
5104 C_MAYBE_CONST_EXPR_NON_CONST (complit
) = 1;
5110 /* Check the type of a compound literal. Here we just check that it
5111 is valid for C++. */
5114 check_compound_literal_type (location_t loc
, struct c_type_name
*type_name
)
5117 && (type_name
->specs
->typespec_kind
== ctsk_tagdef
5118 || type_name
->specs
->typespec_kind
== ctsk_tagfirstref
))
5119 warning_at (loc
, OPT_Wc___compat
,
5120 "defining a type in a compound literal is invalid in C++");
5123 /* Determine whether TYPE is a structure with a flexible array member,
5124 or a union containing such a structure (possibly recursively). */
5127 flexible_array_type_p (tree type
)
5130 switch (TREE_CODE (type
))
5133 x
= TYPE_FIELDS (type
);
5136 while (DECL_CHAIN (x
) != NULL_TREE
)
5138 if (TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
5139 && TYPE_SIZE (TREE_TYPE (x
)) == NULL_TREE
5140 && TYPE_DOMAIN (TREE_TYPE (x
)) != NULL_TREE
5141 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x
))) == NULL_TREE
)
5145 for (x
= TYPE_FIELDS (type
); x
!= NULL_TREE
; x
= DECL_CHAIN (x
))
5147 if (flexible_array_type_p (TREE_TYPE (x
)))
5156 /* Performs sanity checks on the TYPE and WIDTH of the bit-field NAME,
5157 replacing with appropriate values if they are invalid. */
5160 check_bitfield_type_and_width (location_t loc
, tree
*type
, tree
*width
,
5164 unsigned int max_width
;
5165 unsigned HOST_WIDE_INT w
;
5166 const char *name
= (orig_name
5167 ? identifier_to_locale (IDENTIFIER_POINTER (orig_name
))
5168 : _("<anonymous>"));
5170 /* Detect and ignore out of range field width and process valid
5172 if (!INTEGRAL_TYPE_P (TREE_TYPE (*width
)))
5174 error_at (loc
, "bit-field %qs width not an integer constant", name
);
5175 *width
= integer_one_node
;
5179 if (TREE_CODE (*width
) != INTEGER_CST
)
5181 *width
= c_fully_fold (*width
, false, NULL
);
5182 if (TREE_CODE (*width
) == INTEGER_CST
)
5183 pedwarn (loc
, OPT_Wpedantic
,
5184 "bit-field %qs width not an integer constant expression",
5187 if (TREE_CODE (*width
) != INTEGER_CST
)
5189 error_at (loc
, "bit-field %qs width not an integer constant", name
);
5190 *width
= integer_one_node
;
5192 constant_expression_warning (*width
);
5193 if (tree_int_cst_sgn (*width
) < 0)
5195 error_at (loc
, "negative width in bit-field %qs", name
);
5196 *width
= integer_one_node
;
5198 else if (integer_zerop (*width
) && orig_name
)
5200 error_at (loc
, "zero width for bit-field %qs", name
);
5201 *width
= integer_one_node
;
5205 /* Detect invalid bit-field type. */
5206 if (TREE_CODE (*type
) != INTEGER_TYPE
5207 && TREE_CODE (*type
) != BOOLEAN_TYPE
5208 && TREE_CODE (*type
) != ENUMERAL_TYPE
)
5210 error_at (loc
, "bit-field %qs has invalid type", name
);
5211 *type
= unsigned_type_node
;
5214 type_mv
= TYPE_MAIN_VARIANT (*type
);
5215 if (!in_system_header_at (input_location
)
5216 && type_mv
!= integer_type_node
5217 && type_mv
!= unsigned_type_node
5218 && type_mv
!= boolean_type_node
)
5219 pedwarn_c90 (loc
, OPT_Wpedantic
,
5220 "type of bit-field %qs is a GCC extension", name
);
5222 max_width
= TYPE_PRECISION (*type
);
5224 if (0 < compare_tree_int (*width
, max_width
))
5226 error_at (loc
, "width of %qs exceeds its type", name
);
5228 *width
= build_int_cst (integer_type_node
, w
);
5231 w
= tree_to_uhwi (*width
);
5233 if (TREE_CODE (*type
) == ENUMERAL_TYPE
)
5235 struct lang_type
*lt
= TYPE_LANG_SPECIFIC (*type
);
5237 || w
< tree_int_cst_min_precision (lt
->enum_min
, TYPE_SIGN (*type
))
5238 || w
< tree_int_cst_min_precision (lt
->enum_max
, TYPE_SIGN (*type
)))
5239 warning_at (loc
, 0, "%qs is narrower than values of its type", name
);
5245 /* Print warning about variable length array if necessary. */
5248 warn_variable_length_array (tree name
, tree size
)
5250 if (TREE_CONSTANT (size
))
5253 pedwarn_c90 (input_location
, OPT_Wvla
,
5254 "ISO C90 forbids array %qE whose size "
5255 "can%'t be evaluated", name
);
5257 pedwarn_c90 (input_location
, OPT_Wvla
, "ISO C90 forbids array "
5258 "whose size can%'t be evaluated");
5263 pedwarn_c90 (input_location
, OPT_Wvla
,
5264 "ISO C90 forbids variable length array %qE", name
);
5266 pedwarn_c90 (input_location
, OPT_Wvla
, "ISO C90 forbids variable "
5271 /* Print warning about defaulting to int if necessary. */
5274 warn_defaults_to (location_t location
, int opt
, const char *gmsgid
, ...)
5276 diagnostic_info diagnostic
;
5278 rich_location
richloc (line_table
, location
);
5280 va_start (ap
, gmsgid
);
5281 diagnostic_set_info (&diagnostic
, gmsgid
, &ap
, &richloc
,
5282 flag_isoc99
? DK_PEDWARN
: DK_WARNING
);
5283 diagnostic
.option_index
= opt
;
5284 report_diagnostic (&diagnostic
);
5288 /* Given declspecs and a declarator,
5289 determine the name and type of the object declared
5290 and construct a ..._DECL node for it.
5291 (In one case we can return a ..._TYPE node instead.
5292 For invalid input we sometimes return 0.)
5294 DECLSPECS is a c_declspecs structure for the declaration specifiers.
5296 DECL_CONTEXT says which syntactic context this declaration is in:
5297 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
5298 FUNCDEF for a function definition. Like NORMAL but a few different
5299 error messages in each case. Return value may be zero meaning
5300 this definition is too screwy to try to parse.
5301 PARM for a parameter declaration (either within a function prototype
5302 or before a function body). Make a PARM_DECL, or return void_type_node.
5303 TYPENAME if for a typename (in a cast or sizeof).
5304 Don't make a DECL node; just return the ..._TYPE node.
5305 FIELD for a struct or union field; make a FIELD_DECL.
5306 INITIALIZED is true if the decl has an initializer.
5307 WIDTH is non-NULL for bit-fields, and is a pointer to an INTEGER_CST node
5308 representing the width of the bit-field.
5309 DECL_ATTRS points to the list of attributes that should be added to this
5310 decl. Any nested attributes that belong on the decl itself will be
5312 If EXPR is not NULL, any expressions that need to be evaluated as
5313 part of evaluating variably modified types will be stored in *EXPR.
5314 If EXPR_CONST_OPERANDS is not NULL, *EXPR_CONST_OPERANDS will be
5315 set to indicate whether operands in *EXPR can be used in constant
5317 DEPRECATED_STATE is a deprecated_states value indicating whether
5318 deprecation warnings should be suppressed.
5320 In the TYPENAME case, DECLARATOR is really an absolute declarator.
5321 It may also be so in the PARM case, for a prototype where the
5322 argument type is specified but not the name.
5324 This function is where the complicated C meanings of `static'
5325 and `extern' are interpreted. */
5328 grokdeclarator (const struct c_declarator
*declarator
,
5329 struct c_declspecs
*declspecs
,
5330 enum decl_context decl_context
, bool initialized
, tree
*width
,
5331 tree
*decl_attrs
, tree
*expr
, bool *expr_const_operands
,
5332 enum deprecated_states deprecated_state
)
5334 tree type
= declspecs
->type
;
5335 bool threadp
= declspecs
->thread_p
;
5336 enum c_storage_class storage_class
= declspecs
->storage_class
;
5341 int type_quals
= TYPE_UNQUALIFIED
;
5342 tree name
= NULL_TREE
;
5343 bool funcdef_flag
= false;
5344 bool funcdef_syntax
= false;
5345 bool size_varies
= false;
5346 tree decl_attr
= declspecs
->decl_attr
;
5347 int array_ptr_quals
= TYPE_UNQUALIFIED
;
5348 tree array_ptr_attrs
= NULL_TREE
;
5349 int array_parm_static
= 0;
5350 bool array_parm_vla_unspec_p
= false;
5351 tree returned_attrs
= NULL_TREE
;
5352 bool bitfield
= width
!= NULL
;
5354 tree orig_qual_type
= NULL
;
5355 size_t orig_qual_indirect
= 0;
5356 struct c_arg_info
*arg_info
= 0;
5357 addr_space_t as1
, as2
, address_space
;
5358 location_t loc
= UNKNOWN_LOCATION
;
5361 bool expr_const_operands_dummy
;
5362 enum c_declarator_kind first_non_attr_kind
;
5363 unsigned int alignas_align
= 0;
5365 if (TREE_CODE (type
) == ERROR_MARK
)
5366 return error_mark_node
;
5369 if (expr_const_operands
== NULL
)
5370 expr_const_operands
= &expr_const_operands_dummy
;
5372 *expr
= declspecs
->expr
;
5373 *expr_const_operands
= declspecs
->expr_const_operands
;
5375 if (decl_context
== FUNCDEF
)
5376 funcdef_flag
= true, decl_context
= NORMAL
;
5378 /* Look inside a declarator for the name being declared
5379 and get it as an IDENTIFIER_NODE, for an error message. */
5381 const struct c_declarator
*decl
= declarator
;
5383 first_non_attr_kind
= cdk_attrs
;
5393 funcdef_syntax
= (decl
->kind
== cdk_function
);
5394 if (first_non_attr_kind
== cdk_attrs
)
5395 first_non_attr_kind
= decl
->kind
;
5396 decl
= decl
->declarator
;
5400 decl
= decl
->declarator
;
5407 if (first_non_attr_kind
== cdk_attrs
)
5408 first_non_attr_kind
= decl
->kind
;
5417 gcc_assert (decl_context
== PARM
5418 || decl_context
== TYPENAME
5419 || (decl_context
== FIELD
5420 && declarator
->kind
== cdk_id
));
5421 gcc_assert (!initialized
);
5425 /* A function definition's declarator must have the form of
5426 a function declarator. */
5428 if (funcdef_flag
&& !funcdef_syntax
)
5431 /* If this looks like a function definition, make it one,
5432 even if it occurs where parms are expected.
5433 Then store_parm_decls will reject it and not use it as a parm. */
5434 if (decl_context
== NORMAL
&& !funcdef_flag
&& current_scope
->parm_flag
)
5435 decl_context
= PARM
;
5437 if (declspecs
->deprecated_p
&& deprecated_state
!= DEPRECATED_SUPPRESS
)
5438 warn_deprecated_use (declspecs
->type
, declspecs
->decl_attr
);
5440 if ((decl_context
== NORMAL
|| decl_context
== FIELD
)
5441 && current_scope
== file_scope
5442 && variably_modified_type_p (type
, NULL_TREE
))
5445 error_at (loc
, "variably modified %qE at file scope", name
);
5447 error_at (loc
, "variably modified field at file scope");
5448 type
= integer_type_node
;
5451 size_varies
= C_TYPE_VARIABLE_SIZE (type
) != 0;
5453 /* Diagnose defaulting to "int". */
5455 if (declspecs
->default_int_p
&& !in_system_header_at (input_location
))
5457 /* Issue a warning if this is an ISO C 99 program or if
5458 -Wreturn-type and this is a function, or if -Wimplicit;
5459 prefer the former warning since it is more explicit. */
5460 if ((warn_implicit_int
|| warn_return_type
|| flag_isoc99
)
5462 warn_about_return_type
= 1;
5466 warn_defaults_to (loc
, OPT_Wimplicit_int
,
5467 "type defaults to %<int%> in declaration "
5470 warn_defaults_to (loc
, OPT_Wimplicit_int
,
5471 "type defaults to %<int%> in type name");
5475 /* Adjust the type if a bit-field is being declared,
5476 -funsigned-bitfields applied and the type is not explicitly
5478 if (bitfield
&& !flag_signed_bitfields
&& !declspecs
->explicit_signed_p
5479 && TREE_CODE (type
) == INTEGER_TYPE
)
5480 type
= unsigned_type_for (type
);
5482 /* Figure out the type qualifiers for the declaration. There are
5483 two ways a declaration can become qualified. One is something
5484 like `const int i' where the `const' is explicit. Another is
5485 something like `typedef const int CI; CI i' where the type of the
5486 declaration contains the `const'. A third possibility is that
5487 there is a type qualifier on the element type of a typedefed
5488 array type, in which case we should extract that qualifier so
5489 that c_apply_type_quals_to_decl receives the full list of
5490 qualifiers to work with (C90 is not entirely clear about whether
5491 duplicate qualifiers should be diagnosed in this case, but it
5492 seems most appropriate to do so). */
5493 element_type
= strip_array_types (type
);
5494 constp
= declspecs
->const_p
+ TYPE_READONLY (element_type
);
5495 restrictp
= declspecs
->restrict_p
+ TYPE_RESTRICT (element_type
);
5496 volatilep
= declspecs
->volatile_p
+ TYPE_VOLATILE (element_type
);
5497 atomicp
= declspecs
->atomic_p
+ TYPE_ATOMIC (element_type
);
5498 as1
= declspecs
->address_space
;
5499 as2
= TYPE_ADDR_SPACE (element_type
);
5500 address_space
= ADDR_SPACE_GENERIC_P (as1
)? as2
: as1
;
5503 pedwarn_c90 (loc
, OPT_Wpedantic
, "duplicate %<const%>");
5505 pedwarn_c90 (loc
, OPT_Wpedantic
, "duplicate %<restrict%>");
5507 pedwarn_c90 (loc
, OPT_Wpedantic
, "duplicate %<volatile%>");
5509 pedwarn_c90 (loc
, OPT_Wpedantic
, "duplicate %<_Atomic%>");
5511 if (!ADDR_SPACE_GENERIC_P (as1
) && !ADDR_SPACE_GENERIC_P (as2
) && as1
!= as2
)
5512 error_at (loc
, "conflicting named address spaces (%s vs %s)",
5513 c_addr_space_name (as1
), c_addr_space_name (as2
));
5515 if ((TREE_CODE (type
) == ARRAY_TYPE
5516 || first_non_attr_kind
== cdk_array
)
5517 && TYPE_QUALS (element_type
))
5519 orig_qual_type
= type
;
5520 type
= TYPE_MAIN_VARIANT (type
);
5522 type_quals
= ((constp
? TYPE_QUAL_CONST
: 0)
5523 | (restrictp
? TYPE_QUAL_RESTRICT
: 0)
5524 | (volatilep
? TYPE_QUAL_VOLATILE
: 0)
5525 | (atomicp
? TYPE_QUAL_ATOMIC
: 0)
5526 | ENCODE_QUAL_ADDR_SPACE (address_space
));
5527 if (type_quals
!= TYPE_QUALS (element_type
))
5528 orig_qual_type
= NULL_TREE
;
5530 /* Applying the _Atomic qualifier to an array type (through the use
5531 of typedefs or typeof) must be detected here. If the qualifier
5532 is introduced later, any appearance of applying it to an array is
5533 actually applying it to an element of that array. */
5534 if (atomicp
&& TREE_CODE (type
) == ARRAY_TYPE
)
5535 error_at (loc
, "%<_Atomic%>-qualified array type");
5537 /* Warn about storage classes that are invalid for certain
5538 kinds of declarations (parameters, typenames, etc.). */
5542 || storage_class
== csc_auto
5543 || storage_class
== csc_register
5544 || storage_class
== csc_typedef
))
5546 if (storage_class
== csc_auto
)
5548 (current_scope
== file_scope
) ? 0 : OPT_Wpedantic
,
5549 "function definition declared %<auto%>");
5550 if (storage_class
== csc_register
)
5551 error_at (loc
, "function definition declared %<register%>");
5552 if (storage_class
== csc_typedef
)
5553 error_at (loc
, "function definition declared %<typedef%>");
5555 error_at (loc
, "function definition declared %qs",
5556 declspecs
->thread_gnu_p
? "__thread" : "_Thread_local");
5558 if (storage_class
== csc_auto
5559 || storage_class
== csc_register
5560 || storage_class
== csc_typedef
)
5561 storage_class
= csc_none
;
5563 else if (decl_context
!= NORMAL
&& (storage_class
!= csc_none
|| threadp
))
5565 if (decl_context
== PARM
&& storage_class
== csc_register
)
5569 switch (decl_context
)
5573 error_at (loc
, "storage class specified for structure "
5576 error_at (loc
, "storage class specified for structure field");
5580 error_at (loc
, "storage class specified for parameter %qE",
5583 error_at (loc
, "storage class specified for unnamed parameter");
5586 error_at (loc
, "storage class specified for typename");
5589 storage_class
= csc_none
;
5593 else if (storage_class
== csc_extern
5597 /* 'extern' with initialization is invalid if not at file scope. */
5598 if (current_scope
== file_scope
)
5600 /* It is fine to have 'extern const' when compiling at C
5601 and C++ intersection. */
5602 if (!(warn_cxx_compat
&& constp
))
5603 warning_at (loc
, 0, "%qE initialized and declared %<extern%>",
5607 error_at (loc
, "%qE has both %<extern%> and initializer", name
);
5609 else if (current_scope
== file_scope
)
5611 if (storage_class
== csc_auto
)
5612 error_at (loc
, "file-scope declaration of %qE specifies %<auto%>",
5614 if (pedantic
&& storage_class
== csc_register
)
5615 pedwarn (input_location
, OPT_Wpedantic
,
5616 "file-scope declaration of %qE specifies %<register%>", name
);
5620 if (storage_class
== csc_extern
&& funcdef_flag
)
5621 error_at (loc
, "nested function %qE declared %<extern%>", name
);
5622 else if (threadp
&& storage_class
== csc_none
)
5624 error_at (loc
, "function-scope %qE implicitly auto and declared "
5626 declspecs
->thread_gnu_p
? "__thread" : "_Thread_local");
5631 /* Now figure out the structure of the declarator proper.
5632 Descend through it, creating more complex types, until we reach
5633 the declared identifier (or NULL_TREE, in an absolute declarator).
5634 At each stage we maintain an unqualified version of the type
5635 together with any qualifiers that should be applied to it with
5636 c_build_qualified_type; this way, array types including
5637 multidimensional array types are first built up in unqualified
5638 form and then the qualified form is created with
5639 TYPE_MAIN_VARIANT pointing to the unqualified form. */
5641 while (declarator
&& declarator
->kind
!= cdk_id
)
5643 if (type
== error_mark_node
)
5645 declarator
= declarator
->declarator
;
5649 /* Each level of DECLARATOR is either a cdk_array (for ...[..]),
5650 a cdk_pointer (for *...),
5651 a cdk_function (for ...(...)),
5652 a cdk_attrs (for nested attributes),
5653 or a cdk_id (for the name being declared
5654 or the place in an absolute declarator
5655 where the name was omitted).
5656 For the last case, we have just exited the loop.
5658 At this point, TYPE is the type of elements of an array,
5659 or for a function to return, or for a pointer to point to.
5660 After this sequence of ifs, TYPE is the type of the
5661 array or function or pointer, and DECLARATOR has had its
5662 outermost layer removed. */
5664 if (array_ptr_quals
!= TYPE_UNQUALIFIED
5665 || array_ptr_attrs
!= NULL_TREE
5666 || array_parm_static
)
5668 /* Only the innermost declarator (making a parameter be of
5669 array type which is converted to pointer type)
5670 may have static or type qualifiers. */
5671 error_at (loc
, "static or type qualifiers in non-parameter array declarator");
5672 array_ptr_quals
= TYPE_UNQUALIFIED
;
5673 array_ptr_attrs
= NULL_TREE
;
5674 array_parm_static
= 0;
5677 switch (declarator
->kind
)
5681 /* A declarator with embedded attributes. */
5682 tree attrs
= declarator
->u
.attrs
;
5683 const struct c_declarator
*inner_decl
;
5685 declarator
= declarator
->declarator
;
5686 inner_decl
= declarator
;
5687 while (inner_decl
->kind
== cdk_attrs
)
5688 inner_decl
= inner_decl
->declarator
;
5689 if (inner_decl
->kind
== cdk_id
)
5690 attr_flags
|= (int) ATTR_FLAG_DECL_NEXT
;
5691 else if (inner_decl
->kind
== cdk_function
)
5692 attr_flags
|= (int) ATTR_FLAG_FUNCTION_NEXT
;
5693 else if (inner_decl
->kind
== cdk_array
)
5694 attr_flags
|= (int) ATTR_FLAG_ARRAY_NEXT
;
5695 returned_attrs
= decl_attributes (&type
,
5696 chainon (returned_attrs
, attrs
),
5702 tree itype
= NULL_TREE
;
5703 tree size
= declarator
->u
.array
.dimen
;
5704 /* The index is a signed object `sizetype' bits wide. */
5705 tree index_type
= c_common_signed_type (sizetype
);
5707 array_ptr_quals
= declarator
->u
.array
.quals
;
5708 array_ptr_attrs
= declarator
->u
.array
.attrs
;
5709 array_parm_static
= declarator
->u
.array
.static_p
;
5710 array_parm_vla_unspec_p
= declarator
->u
.array
.vla_unspec_p
;
5712 declarator
= declarator
->declarator
;
5714 /* Check for some types that there cannot be arrays of. */
5716 if (VOID_TYPE_P (type
))
5719 error_at (loc
, "declaration of %qE as array of voids", name
);
5721 error_at (loc
, "declaration of type name as array of voids");
5722 type
= error_mark_node
;
5725 if (TREE_CODE (type
) == FUNCTION_TYPE
)
5728 error_at (loc
, "declaration of %qE as array of functions",
5731 error_at (loc
, "declaration of type name as array of "
5733 type
= error_mark_node
;
5736 if (pedantic
&& !in_system_header_at (input_location
)
5737 && flexible_array_type_p (type
))
5738 pedwarn (loc
, OPT_Wpedantic
,
5739 "invalid use of structure with flexible array member");
5741 if (size
== error_mark_node
)
5742 type
= error_mark_node
;
5744 if (type
== error_mark_node
)
5747 /* If size was specified, set ITYPE to a range-type for
5748 that size. Otherwise, ITYPE remains null. finish_decl
5749 may figure it out from an initial value. */
5753 bool size_maybe_const
= true;
5754 bool size_int_const
= (TREE_CODE (size
) == INTEGER_CST
5755 && !TREE_OVERFLOW (size
));
5756 bool this_size_varies
= false;
5758 /* Strip NON_LVALUE_EXPRs since we aren't using as an
5760 STRIP_TYPE_NOPS (size
);
5762 if (!INTEGRAL_TYPE_P (TREE_TYPE (size
)))
5765 error_at (loc
, "size of array %qE has non-integer type",
5769 "size of unnamed array has non-integer type");
5770 size
= integer_one_node
;
5773 size
= c_fully_fold (size
, false, &size_maybe_const
);
5775 if (pedantic
&& size_maybe_const
&& integer_zerop (size
))
5778 pedwarn (loc
, OPT_Wpedantic
,
5779 "ISO C forbids zero-size array %qE", name
);
5781 pedwarn (loc
, OPT_Wpedantic
,
5782 "ISO C forbids zero-size array");
5785 if (TREE_CODE (size
) == INTEGER_CST
&& size_maybe_const
)
5787 constant_expression_warning (size
);
5788 if (tree_int_cst_sgn (size
) < 0)
5791 error_at (loc
, "size of array %qE is negative", name
);
5793 error_at (loc
, "size of unnamed array is negative");
5794 size
= integer_one_node
;
5796 /* Handle a size folded to an integer constant but
5797 not an integer constant expression. */
5798 if (!size_int_const
)
5800 /* If this is a file scope declaration of an
5801 ordinary identifier, this is invalid code;
5802 diagnosing it here and not subsequently
5803 treating the type as variable-length avoids
5804 more confusing diagnostics later. */
5805 if ((decl_context
== NORMAL
|| decl_context
== FIELD
)
5806 && current_scope
== file_scope
)
5807 pedwarn (input_location
, 0,
5808 "variably modified %qE at file scope",
5811 this_size_varies
= size_varies
= true;
5812 warn_variable_length_array (name
, size
);
5815 else if ((decl_context
== NORMAL
|| decl_context
== FIELD
)
5816 && current_scope
== file_scope
)
5818 error_at (loc
, "variably modified %qE at file scope", name
);
5819 size
= integer_one_node
;
5823 /* Make sure the array size remains visibly
5824 nonconstant even if it is (eg) a const variable
5825 with known value. */
5826 this_size_varies
= size_varies
= true;
5827 warn_variable_length_array (name
, size
);
5828 if (flag_sanitize
& SANITIZE_VLA
5829 && decl_context
== NORMAL
5830 && do_ubsan_in_current_function ())
5832 /* Evaluate the array size only once. */
5833 size
= c_save_expr (size
);
5834 size
= c_fully_fold (size
, false, NULL
);
5835 size
= fold_build2 (COMPOUND_EXPR
, TREE_TYPE (size
),
5836 ubsan_instrument_vla (loc
, size
),
5841 if (integer_zerop (size
) && !this_size_varies
)
5843 /* A zero-length array cannot be represented with
5844 an unsigned index type, which is what we'll
5845 get with build_index_type. Create an
5846 open-ended range instead. */
5847 itype
= build_range_type (sizetype
, size
, NULL_TREE
);
5851 /* Arrange for the SAVE_EXPR on the inside of the
5852 MINUS_EXPR, which allows the -1 to get folded
5853 with the +1 that happens when building TYPE_SIZE. */
5855 size
= save_expr (size
);
5856 if (this_size_varies
&& TREE_CODE (size
) == INTEGER_CST
)
5857 size
= build2 (COMPOUND_EXPR
, TREE_TYPE (size
),
5858 integer_zero_node
, size
);
5860 /* Compute the maximum valid index, that is, size
5861 - 1. Do the calculation in index_type, so that
5862 if it is a variable the computations will be
5863 done in the proper mode. */
5864 itype
= fold_build2_loc (loc
, MINUS_EXPR
, index_type
,
5865 convert (index_type
, size
),
5866 convert (index_type
,
5869 /* The above overflows when size does not fit
5871 ??? While a size of INT_MAX+1 technically shouldn't
5872 cause an overflow (because we subtract 1), handling
5873 this case seems like an unnecessary complication. */
5874 if (TREE_CODE (size
) == INTEGER_CST
5875 && !int_fits_type_p (size
, index_type
))
5878 error_at (loc
, "size of array %qE is too large",
5881 error_at (loc
, "size of unnamed array is too large");
5882 type
= error_mark_node
;
5886 itype
= build_index_type (itype
);
5888 if (this_size_varies
)
5891 *expr
= build2 (COMPOUND_EXPR
, TREE_TYPE (size
),
5895 *expr_const_operands
&= size_maybe_const
;
5898 else if (decl_context
== FIELD
)
5900 bool flexible_array_member
= false;
5901 if (array_parm_vla_unspec_p
)
5902 /* Field names can in fact have function prototype
5903 scope so [*] is disallowed here through making
5904 the field variably modified, not through being
5905 something other than a declaration with function
5910 const struct c_declarator
*t
= declarator
;
5911 while (t
->kind
== cdk_attrs
)
5913 flexible_array_member
= (t
->kind
== cdk_id
);
5915 if (flexible_array_member
5916 && !in_system_header_at (input_location
))
5917 pedwarn_c90 (loc
, OPT_Wpedantic
, "ISO C90 does not "
5918 "support flexible array members");
5920 /* ISO C99 Flexible array members are effectively
5921 identical to GCC's zero-length array extension. */
5922 if (flexible_array_member
|| array_parm_vla_unspec_p
)
5923 itype
= build_range_type (sizetype
, size_zero_node
,
5926 else if (decl_context
== PARM
)
5928 if (array_parm_vla_unspec_p
)
5930 itype
= build_range_type (sizetype
, size_zero_node
, NULL_TREE
);
5934 else if (decl_context
== TYPENAME
)
5936 if (array_parm_vla_unspec_p
)
5939 warning (0, "%<[*]%> not in a declaration");
5940 /* We use this to avoid messing up with incomplete
5941 array types of the same type, that would
5942 otherwise be modified below. */
5943 itype
= build_range_type (sizetype
, size_zero_node
,
5949 /* Complain about arrays of incomplete types. */
5950 if (!COMPLETE_TYPE_P (type
))
5952 error_at (loc
, "array type has incomplete element type %qT",
5954 type
= error_mark_node
;
5957 /* When itype is NULL, a shared incomplete array type is
5958 returned for all array of a given type. Elsewhere we
5959 make sure we don't complete that type before copying
5960 it, but here we want to make sure we don't ever
5961 modify the shared type, so we gcc_assert (itype)
5964 addr_space_t as
= DECODE_QUAL_ADDR_SPACE (type_quals
);
5965 if (!ADDR_SPACE_GENERIC_P (as
) && as
!= TYPE_ADDR_SPACE (type
))
5966 type
= build_qualified_type (type
,
5967 ENCODE_QUAL_ADDR_SPACE (as
));
5969 type
= build_array_type (type
, itype
);
5972 if (type
!= error_mark_node
)
5976 /* It is ok to modify type here even if itype is
5977 NULL: if size_varies, we're in a
5978 multi-dimensional array and the inner type has
5979 variable size, so the enclosing shared array type
5981 if (size
&& TREE_CODE (size
) == INTEGER_CST
)
5983 = build_distinct_type_copy (TYPE_MAIN_VARIANT (type
));
5984 C_TYPE_VARIABLE_SIZE (type
) = 1;
5987 /* The GCC extension for zero-length arrays differs from
5988 ISO flexible array members in that sizeof yields
5990 if (size
&& integer_zerop (size
))
5993 type
= build_distinct_type_copy (TYPE_MAIN_VARIANT (type
));
5994 TYPE_SIZE (type
) = bitsize_zero_node
;
5995 TYPE_SIZE_UNIT (type
) = size_zero_node
;
5996 SET_TYPE_STRUCTURAL_EQUALITY (type
);
5998 if (array_parm_vla_unspec_p
)
6001 /* The type is complete. C99 6.7.5.2p4 */
6002 type
= build_distinct_type_copy (TYPE_MAIN_VARIANT (type
));
6003 TYPE_SIZE (type
) = bitsize_zero_node
;
6004 TYPE_SIZE_UNIT (type
) = size_zero_node
;
6005 SET_TYPE_STRUCTURAL_EQUALITY (type
);
6008 if (!valid_array_size_p (loc
, type
, name
))
6009 type
= error_mark_node
;
6012 if (decl_context
!= PARM
6013 && (array_ptr_quals
!= TYPE_UNQUALIFIED
6014 || array_ptr_attrs
!= NULL_TREE
6015 || array_parm_static
))
6017 error_at (loc
, "static or type qualifiers in non-parameter "
6018 "array declarator");
6019 array_ptr_quals
= TYPE_UNQUALIFIED
;
6020 array_ptr_attrs
= NULL_TREE
;
6021 array_parm_static
= 0;
6023 orig_qual_indirect
++;
6028 /* Say it's a definition only for the declarator closest
6029 to the identifier, apart possibly from some
6031 bool really_funcdef
= false;
6033 orig_qual_type
= NULL_TREE
;
6036 const struct c_declarator
*t
= declarator
->declarator
;
6037 while (t
->kind
== cdk_attrs
)
6039 really_funcdef
= (t
->kind
== cdk_id
);
6042 /* Declaring a function type. Make sure we have a valid
6043 type for the function to return. */
6044 if (type
== error_mark_node
)
6047 size_varies
= false;
6049 /* Warn about some types functions can't return. */
6050 if (TREE_CODE (type
) == FUNCTION_TYPE
)
6053 error_at (loc
, "%qE declared as function returning a "
6056 error_at (loc
, "type name declared as function "
6057 "returning a function");
6058 type
= integer_type_node
;
6060 if (TREE_CODE (type
) == ARRAY_TYPE
)
6063 error_at (loc
, "%qE declared as function returning an array",
6066 error_at (loc
, "type name declared as function returning "
6068 type
= integer_type_node
;
6070 errmsg
= targetm
.invalid_return_type (type
);
6074 type
= integer_type_node
;
6077 /* Construct the function type and go to the next
6078 inner layer of declarator. */
6079 arg_info
= declarator
->u
.arg_info
;
6080 arg_types
= grokparms (arg_info
, really_funcdef
);
6082 /* Type qualifiers before the return type of the function
6083 qualify the return type, not the function type. */
6086 /* Type qualifiers on a function return type are
6087 normally permitted by the standard but have no
6088 effect, so give a warning at -Wreturn-type.
6089 Qualifiers on a void return type are banned on
6090 function definitions in ISO C; GCC used to used
6091 them for noreturn functions. */
6092 if (VOID_TYPE_P (type
) && really_funcdef
)
6094 "function definition has qualified void return type");
6096 warning_at (loc
, OPT_Wignored_qualifiers
,
6097 "type qualifiers ignored on function return type");
6099 type
= c_build_qualified_type (type
, type_quals
);
6101 type_quals
= TYPE_UNQUALIFIED
;
6103 type
= build_function_type (type
, arg_types
);
6104 declarator
= declarator
->declarator
;
6106 /* Set the TYPE_CONTEXTs for each tagged type which is local to
6107 the formal parameter list of this FUNCTION_TYPE to point to
6108 the FUNCTION_TYPE node itself. */
6113 FOR_EACH_VEC_SAFE_ELT_REVERSE (arg_info
->tags
, ix
, tag
)
6114 TYPE_CONTEXT (tag
->type
) = type
;
6120 /* Merge any constancy or volatility into the target type
6122 if ((type_quals
& TYPE_QUAL_ATOMIC
)
6123 && TREE_CODE (type
) == FUNCTION_TYPE
)
6126 "%<_Atomic%>-qualified function type");
6127 type_quals
&= ~TYPE_QUAL_ATOMIC
;
6129 else if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
6131 pedwarn (loc
, OPT_Wpedantic
,
6132 "ISO C forbids qualified function types");
6134 type
= c_build_qualified_type (type
, type_quals
, orig_qual_type
,
6135 orig_qual_indirect
);
6136 orig_qual_type
= NULL_TREE
;
6137 size_varies
= false;
6139 /* When the pointed-to type involves components of variable size,
6140 care must be taken to ensure that the size evaluation code is
6141 emitted early enough to dominate all the possible later uses
6142 and late enough for the variables on which it depends to have
6145 This is expected to happen automatically when the pointed-to
6146 type has a name/declaration of it's own, but special attention
6147 is required if the type is anonymous.
6149 We handle the NORMAL and FIELD contexts here by attaching an
6150 artificial TYPE_DECL to such pointed-to type. This forces the
6151 sizes evaluation at a safe point and ensures it is not deferred
6152 until e.g. within a deeper conditional context.
6154 We expect nothing to be needed here for PARM or TYPENAME.
6155 Pushing a TYPE_DECL at this point for TYPENAME would actually
6156 be incorrect, as we might be in the middle of an expression
6157 with side effects on the pointed-to type size "arguments" prior
6158 to the pointer declaration point and the fake TYPE_DECL in the
6159 enclosing context would force the size evaluation prior to the
6162 if (!TYPE_NAME (type
)
6163 && (decl_context
== NORMAL
|| decl_context
== FIELD
)
6164 && variably_modified_type_p (type
, NULL_TREE
))
6166 tree decl
= build_decl (loc
, TYPE_DECL
, NULL_TREE
, type
);
6167 DECL_ARTIFICIAL (decl
) = 1;
6169 finish_decl (decl
, loc
, NULL_TREE
, NULL_TREE
, NULL_TREE
);
6170 TYPE_NAME (type
) = decl
;
6173 type
= c_build_pointer_type (type
);
6175 /* Process type qualifiers (such as const or volatile)
6176 that were given inside the `*'. */
6177 type_quals
= declarator
->u
.pointer_quals
;
6179 declarator
= declarator
->declarator
;
6186 *decl_attrs
= chainon (returned_attrs
, *decl_attrs
);
6188 /* Now TYPE has the actual type, apart from any qualifiers in
6191 /* Warn about address space used for things other than static memory or
6193 address_space
= DECODE_QUAL_ADDR_SPACE (type_quals
);
6194 if (!ADDR_SPACE_GENERIC_P (address_space
))
6196 if (decl_context
== NORMAL
)
6198 switch (storage_class
)
6201 error ("%qs combined with %<auto%> qualifier for %qE",
6202 c_addr_space_name (address_space
), name
);
6205 error ("%qs combined with %<register%> qualifier for %qE",
6206 c_addr_space_name (address_space
), name
);
6209 if (current_function_scope
)
6211 error ("%qs specified for auto variable %qE",
6212 c_addr_space_name (address_space
), name
);
6224 else if (decl_context
== PARM
&& TREE_CODE (type
) != ARRAY_TYPE
)
6227 error ("%qs specified for parameter %qE",
6228 c_addr_space_name (address_space
), name
);
6230 error ("%qs specified for unnamed parameter",
6231 c_addr_space_name (address_space
));
6233 else if (decl_context
== FIELD
)
6236 error ("%qs specified for structure field %qE",
6237 c_addr_space_name (address_space
), name
);
6239 error ("%qs specified for structure field",
6240 c_addr_space_name (address_space
));
6244 /* Check the type and width of a bit-field. */
6247 check_bitfield_type_and_width (loc
, &type
, width
, name
);
6248 /* C11 makes it implementation-defined (6.7.2.1#5) whether
6249 atomic types are permitted for bit-fields; we have no code to
6250 make bit-field accesses atomic, so disallow them. */
6251 if (type_quals
& TYPE_QUAL_ATOMIC
)
6254 error_at (loc
, "bit-field %qE has atomic type", name
);
6256 error_at (loc
, "bit-field has atomic type");
6257 type_quals
&= ~TYPE_QUAL_ATOMIC
;
6261 /* Reject invalid uses of _Alignas. */
6262 if (declspecs
->alignas_p
)
6264 if (storage_class
== csc_typedef
)
6265 error_at (loc
, "alignment specified for typedef %qE", name
);
6266 else if (storage_class
== csc_register
)
6267 error_at (loc
, "alignment specified for %<register%> object %qE",
6269 else if (decl_context
== PARM
)
6272 error_at (loc
, "alignment specified for parameter %qE", name
);
6274 error_at (loc
, "alignment specified for unnamed parameter");
6279 error_at (loc
, "alignment specified for bit-field %qE", name
);
6281 error_at (loc
, "alignment specified for unnamed bit-field");
6283 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
6284 error_at (loc
, "alignment specified for function %qE", name
);
6285 else if (declspecs
->align_log
!= -1)
6287 alignas_align
= 1U << declspecs
->align_log
;
6288 if (alignas_align
< min_align_of_type (type
))
6291 error_at (loc
, "%<_Alignas%> specifiers cannot reduce "
6292 "alignment of %qE", name
);
6294 error_at (loc
, "%<_Alignas%> specifiers cannot reduce "
6295 "alignment of unnamed field");
6301 /* If this is declaring a typedef name, return a TYPE_DECL. */
6303 if (storage_class
== csc_typedef
)
6306 if ((type_quals
& TYPE_QUAL_ATOMIC
)
6307 && TREE_CODE (type
) == FUNCTION_TYPE
)
6310 "%<_Atomic%>-qualified function type");
6311 type_quals
&= ~TYPE_QUAL_ATOMIC
;
6313 else if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
6315 pedwarn (loc
, OPT_Wpedantic
,
6316 "ISO C forbids qualified function types");
6318 type
= c_build_qualified_type (type
, type_quals
, orig_qual_type
,
6319 orig_qual_indirect
);
6320 decl
= build_decl (declarator
->id_loc
,
6321 TYPE_DECL
, declarator
->u
.id
, type
);
6322 if (declspecs
->explicit_signed_p
)
6323 C_TYPEDEF_EXPLICITLY_SIGNED (decl
) = 1;
6324 if (declspecs
->inline_p
)
6325 pedwarn (loc
, 0,"typedef %q+D declared %<inline%>", decl
);
6326 if (declspecs
->noreturn_p
)
6327 pedwarn (loc
, 0,"typedef %q+D declared %<_Noreturn%>", decl
);
6329 if (warn_cxx_compat
&& declarator
->u
.id
!= NULL_TREE
)
6331 struct c_binding
*b
= I_TAG_BINDING (declarator
->u
.id
);
6334 && b
->decl
!= NULL_TREE
6335 && (B_IN_CURRENT_SCOPE (b
)
6336 || (current_scope
== file_scope
&& B_IN_EXTERNAL_SCOPE (b
)))
6337 && TYPE_MAIN_VARIANT (b
->decl
) != TYPE_MAIN_VARIANT (type
))
6339 warning_at (declarator
->id_loc
, OPT_Wc___compat
,
6340 ("using %qD as both a typedef and a tag is "
6343 if (b
->locus
!= UNKNOWN_LOCATION
)
6344 inform (b
->locus
, "originally defined here");
6351 /* If this is a type name (such as, in a cast or sizeof),
6352 compute the type and return it now. */
6354 if (decl_context
== TYPENAME
)
6356 /* Note that the grammar rejects storage classes in typenames
6358 gcc_assert (storage_class
== csc_none
&& !threadp
6359 && !declspecs
->inline_p
&& !declspecs
->noreturn_p
);
6360 if ((type_quals
& TYPE_QUAL_ATOMIC
)
6361 && TREE_CODE (type
) == FUNCTION_TYPE
)
6364 "%<_Atomic%>-qualified function type");
6365 type_quals
&= ~TYPE_QUAL_ATOMIC
;
6367 else if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
6369 pedwarn (loc
, OPT_Wpedantic
,
6370 "ISO C forbids const or volatile function types");
6372 type
= c_build_qualified_type (type
, type_quals
, orig_qual_type
,
6373 orig_qual_indirect
);
6377 if (pedantic
&& decl_context
== FIELD
6378 && variably_modified_type_p (type
, NULL_TREE
))
6381 pedwarn (loc
, OPT_Wpedantic
, "a member of a structure or union cannot "
6382 "have a variably modified type");
6385 /* Aside from typedefs and type names (handle above),
6386 `void' at top level (not within pointer)
6387 is allowed only in public variables.
6388 We don't complain about parms either, but that is because
6389 a better error message can be made later. */
6391 if (VOID_TYPE_P (type
) && decl_context
!= PARM
6392 && !((decl_context
!= FIELD
&& TREE_CODE (type
) != FUNCTION_TYPE
)
6393 && (storage_class
== csc_extern
6394 || (current_scope
== file_scope
6395 && !(storage_class
== csc_static
6396 || storage_class
== csc_register
)))))
6398 error_at (loc
, "variable or field %qE declared void", name
);
6399 type
= integer_type_node
;
6402 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
6403 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
6408 if (decl_context
== PARM
)
6411 bool array_parameter_p
= false;
6413 /* A parameter declared as an array of T is really a pointer to T.
6414 One declared as a function is really a pointer to a function. */
6416 if (TREE_CODE (type
) == ARRAY_TYPE
)
6418 /* Transfer const-ness of array into that of type pointed to. */
6419 type
= TREE_TYPE (type
);
6420 if (orig_qual_type
!= NULL_TREE
)
6422 if (orig_qual_indirect
== 0)
6423 orig_qual_type
= TREE_TYPE (orig_qual_type
);
6425 orig_qual_indirect
--;
6428 type
= c_build_qualified_type (type
, type_quals
, orig_qual_type
,
6429 orig_qual_indirect
);
6430 type
= c_build_pointer_type (type
);
6431 type_quals
= array_ptr_quals
;
6433 type
= c_build_qualified_type (type
, type_quals
);
6435 /* We don't yet implement attributes in this context. */
6436 if (array_ptr_attrs
!= NULL_TREE
)
6437 warning_at (loc
, OPT_Wattributes
,
6438 "attributes in parameter array declarator ignored");
6440 size_varies
= false;
6441 array_parameter_p
= true;
6443 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
6445 if (type_quals
& TYPE_QUAL_ATOMIC
)
6448 "%<_Atomic%>-qualified function type");
6449 type_quals
&= ~TYPE_QUAL_ATOMIC
;
6451 else if (type_quals
)
6452 pedwarn (loc
, OPT_Wpedantic
,
6453 "ISO C forbids qualified function types");
6455 type
= c_build_qualified_type (type
, type_quals
);
6456 type
= c_build_pointer_type (type
);
6457 type_quals
= TYPE_UNQUALIFIED
;
6459 else if (type_quals
)
6460 type
= c_build_qualified_type (type
, type_quals
);
6462 decl
= build_decl (declarator
->id_loc
,
6463 PARM_DECL
, declarator
->u
.id
, type
);
6465 C_DECL_VARIABLE_SIZE (decl
) = 1;
6466 C_ARRAY_PARAMETER (decl
) = array_parameter_p
;
6468 /* Compute the type actually passed in the parmlist,
6469 for the case where there is no prototype.
6470 (For example, shorts and chars are passed as ints.)
6471 When there is a prototype, this is overridden later. */
6473 if (type
== error_mark_node
)
6474 promoted_type
= type
;
6476 promoted_type
= c_type_promotes_to (type
);
6478 DECL_ARG_TYPE (decl
) = promoted_type
;
6479 if (declspecs
->inline_p
)
6480 pedwarn (loc
, 0, "parameter %q+D declared %<inline%>", decl
);
6481 if (declspecs
->noreturn_p
)
6482 pedwarn (loc
, 0, "parameter %q+D declared %<_Noreturn%>", decl
);
6484 else if (decl_context
== FIELD
)
6486 /* Note that the grammar rejects storage classes in typenames
6488 gcc_assert (storage_class
== csc_none
&& !threadp
6489 && !declspecs
->inline_p
&& !declspecs
->noreturn_p
);
6491 /* Structure field. It may not be a function. */
6493 if (TREE_CODE (type
) == FUNCTION_TYPE
)
6495 error_at (loc
, "field %qE declared as a function", name
);
6496 type
= build_pointer_type (type
);
6498 else if (TREE_CODE (type
) != ERROR_MARK
6499 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type
))
6502 error_at (loc
, "field %qE has incomplete type", name
);
6504 error_at (loc
, "unnamed field has incomplete type");
6505 type
= error_mark_node
;
6507 else if (TREE_CODE (type
) == ARRAY_TYPE
6508 && TYPE_DOMAIN (type
) == NULL_TREE
)
6510 /* We have a flexible array member through a typedef.
6511 Set suitable range. Whether this is a correct position
6512 for a flexible array member will be determined elsewhere. */
6513 if (!in_system_header_at (input_location
))
6514 pedwarn_c90 (loc
, OPT_Wpedantic
, "ISO C90 does not "
6515 "support flexible array members");
6516 type
= build_distinct_type_copy (TYPE_MAIN_VARIANT (type
));
6517 TYPE_DOMAIN (type
) = build_range_type (sizetype
, size_zero_node
,
6520 type
= c_build_qualified_type (type
, type_quals
, orig_qual_type
,
6521 orig_qual_indirect
);
6522 decl
= build_decl (declarator
->id_loc
,
6523 FIELD_DECL
, declarator
->u
.id
, type
);
6524 DECL_NONADDRESSABLE_P (decl
) = bitfield
;
6525 if (bitfield
&& !declarator
->u
.id
)
6526 TREE_NO_WARNING (decl
) = 1;
6529 C_DECL_VARIABLE_SIZE (decl
) = 1;
6531 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
6533 if (storage_class
== csc_register
|| threadp
)
6535 error_at (loc
, "invalid storage class for function %qE", name
);
6537 else if (current_scope
!= file_scope
)
6539 /* Function declaration not at file scope. Storage
6540 classes other than `extern' are not allowed, C99
6541 6.7.1p5, and `extern' makes no difference. However,
6542 GCC allows 'auto', perhaps with 'inline', to support
6543 nested functions. */
6544 if (storage_class
== csc_auto
)
6545 pedwarn (loc
, OPT_Wpedantic
,
6546 "invalid storage class for function %qE", name
);
6547 else if (storage_class
== csc_static
)
6549 error_at (loc
, "invalid storage class for function %qE", name
);
6551 storage_class
= declspecs
->storage_class
= csc_none
;
6557 decl
= build_decl (declarator
->id_loc
,
6558 FUNCTION_DECL
, declarator
->u
.id
, type
);
6559 decl
= build_decl_attribute_variant (decl
, decl_attr
);
6561 if (type_quals
& TYPE_QUAL_ATOMIC
)
6564 "%<_Atomic%>-qualified function type");
6565 type_quals
&= ~TYPE_QUAL_ATOMIC
;
6567 else if (pedantic
&& type_quals
&& !DECL_IN_SYSTEM_HEADER (decl
))
6568 pedwarn (loc
, OPT_Wpedantic
,
6569 "ISO C forbids qualified function types");
6571 /* Every function declaration is an external reference
6572 (DECL_EXTERNAL) except for those which are not at file
6573 scope and are explicitly declared "auto". This is
6574 forbidden by standard C (C99 6.7.1p5) and is interpreted by
6575 GCC to signify a forward declaration of a nested function. */
6576 if (storage_class
== csc_auto
&& current_scope
!= file_scope
)
6577 DECL_EXTERNAL (decl
) = 0;
6578 /* In C99, a function which is declared 'inline' with 'extern'
6579 is not an external reference (which is confusing). It
6580 means that the later definition of the function must be output
6581 in this file, C99 6.7.4p6. In GNU C89, a function declared
6582 'extern inline' is an external reference. */
6583 else if (declspecs
->inline_p
&& storage_class
!= csc_static
)
6584 DECL_EXTERNAL (decl
) = ((storage_class
== csc_extern
)
6585 == flag_gnu89_inline
);
6587 DECL_EXTERNAL (decl
) = !initialized
;
6589 /* Record absence of global scope for `static' or `auto'. */
6591 = !(storage_class
== csc_static
|| storage_class
== csc_auto
);
6593 /* For a function definition, record the argument information
6594 block where store_parm_decls will look for it. */
6596 current_function_arg_info
= arg_info
;
6598 if (declspecs
->default_int_p
)
6599 C_FUNCTION_IMPLICIT_INT (decl
) = 1;
6601 /* Record presence of `inline' and `_Noreturn', if it is
6603 if (flag_hosted
&& MAIN_NAME_P (declarator
->u
.id
))
6605 if (declspecs
->inline_p
)
6606 pedwarn (loc
, 0, "cannot inline function %<main%>");
6607 if (declspecs
->noreturn_p
)
6608 pedwarn (loc
, 0, "%<main%> declared %<_Noreturn%>");
6612 if (declspecs
->inline_p
)
6613 /* Record that the function is declared `inline'. */
6614 DECL_DECLARED_INLINE_P (decl
) = 1;
6615 if (declspecs
->noreturn_p
)
6618 pedwarn_c99 (loc
, OPT_Wpedantic
,
6619 "ISO C99 does not support %<_Noreturn%>");
6621 pedwarn_c99 (loc
, OPT_Wpedantic
,
6622 "ISO C90 does not support %<_Noreturn%>");
6623 TREE_THIS_VOLATILE (decl
) = 1;
6629 /* It's a variable. */
6630 /* An uninitialized decl with `extern' is a reference. */
6631 int extern_ref
= !initialized
&& storage_class
== csc_extern
;
6633 type
= c_build_qualified_type (type
, type_quals
, orig_qual_type
,
6634 orig_qual_indirect
);
6636 /* C99 6.2.2p7: It is invalid (compile-time undefined
6637 behavior) to create an 'extern' declaration for a
6638 variable if there is a global declaration that is
6639 'static' and the global declaration is not visible.
6640 (If the static declaration _is_ currently visible,
6641 the 'extern' declaration is taken to refer to that decl.) */
6642 if (extern_ref
&& current_scope
!= file_scope
)
6644 tree global_decl
= identifier_global_value (declarator
->u
.id
);
6645 tree visible_decl
= lookup_name (declarator
->u
.id
);
6648 && global_decl
!= visible_decl
6649 && VAR_P (global_decl
)
6650 && !TREE_PUBLIC (global_decl
))
6651 error_at (loc
, "variable previously declared %<static%> "
6652 "redeclared %<extern%>");
6655 decl
= build_decl (declarator
->id_loc
,
6656 VAR_DECL
, declarator
->u
.id
, type
);
6658 C_DECL_VARIABLE_SIZE (decl
) = 1;
6660 if (declspecs
->inline_p
)
6661 pedwarn (loc
, 0, "variable %q+D declared %<inline%>", decl
);
6662 if (declspecs
->noreturn_p
)
6663 pedwarn (loc
, 0, "variable %q+D declared %<_Noreturn%>", decl
);
6665 /* At file scope, an initialized extern declaration may follow
6666 a static declaration. In that case, DECL_EXTERNAL will be
6667 reset later in start_decl. */
6668 DECL_EXTERNAL (decl
) = (storage_class
== csc_extern
);
6670 /* At file scope, the presence of a `static' or `register' storage
6671 class specifier, or the absence of all storage class specifiers
6672 makes this declaration a definition (perhaps tentative). Also,
6673 the absence of `static' makes it public. */
6674 if (current_scope
== file_scope
)
6676 TREE_PUBLIC (decl
) = storage_class
!= csc_static
;
6677 TREE_STATIC (decl
) = !extern_ref
;
6679 /* Not at file scope, only `static' makes a static definition. */
6682 TREE_STATIC (decl
) = (storage_class
== csc_static
);
6683 TREE_PUBLIC (decl
) = extern_ref
;
6687 set_decl_tls_model (decl
, decl_default_tls_model (decl
));
6690 if ((storage_class
== csc_extern
6691 || (storage_class
== csc_none
6692 && TREE_CODE (type
) == FUNCTION_TYPE
6694 && variably_modified_type_p (type
, NULL_TREE
))
6697 if (TREE_CODE (type
) == FUNCTION_TYPE
)
6698 error_at (loc
, "non-nested function with variably modified type");
6700 error_at (loc
, "object with variably modified type must have "
6704 /* Record `register' declaration for warnings on &
6705 and in case doing stupid register allocation. */
6707 if (storage_class
== csc_register
)
6709 C_DECL_REGISTER (decl
) = 1;
6710 DECL_REGISTER (decl
) = 1;
6713 /* Record constancy and volatility. */
6714 c_apply_type_quals_to_decl (type_quals
, decl
);
6716 /* Apply _Alignas specifiers. */
6719 DECL_ALIGN (decl
) = alignas_align
* BITS_PER_UNIT
;
6720 DECL_USER_ALIGN (decl
) = 1;
6723 /* If a type has volatile components, it should be stored in memory.
6724 Otherwise, the fact that those components are volatile
6725 will be ignored, and would even crash the compiler.
6726 Of course, this only makes sense on VAR,PARM, and RESULT decl's. */
6727 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl
))
6728 && (VAR_P (decl
) || TREE_CODE (decl
) == PARM_DECL
6729 || TREE_CODE (decl
) == RESULT_DECL
))
6731 /* It is not an error for a structure with volatile fields to
6732 be declared register, but reset DECL_REGISTER since it
6733 cannot actually go in a register. */
6734 int was_reg
= C_DECL_REGISTER (decl
);
6735 C_DECL_REGISTER (decl
) = 0;
6736 DECL_REGISTER (decl
) = 0;
6737 c_mark_addressable (decl
);
6738 C_DECL_REGISTER (decl
) = was_reg
;
6741 /* This is the earliest point at which we might know the assembler
6742 name of a variable. Thus, if it's known before this, die horribly. */
6743 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl
));
6747 && TREE_PUBLIC (decl
)
6748 && TREE_STATIC (decl
)
6749 && (RECORD_OR_UNION_TYPE_P (TREE_TYPE (decl
))
6750 || TREE_CODE (TREE_TYPE (decl
)) == ENUMERAL_TYPE
)
6751 && TYPE_NAME (TREE_TYPE (decl
)) == NULL_TREE
)
6752 warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wc___compat
,
6753 ("non-local variable %qD with anonymous type is "
6754 "questionable in C++"),
6761 /* Decode the parameter-list info for a function type or function definition.
6762 The argument is the value returned by `get_parm_info' (or made in c-parse.c
6763 if there is an identifier list instead of a parameter decl list).
6764 These two functions are separate because when a function returns
6765 or receives functions then each is called multiple times but the order
6766 of calls is different. The last call to `grokparms' is always the one
6767 that contains the formal parameter names of a function definition.
6769 Return a list of arg types to use in the FUNCTION_TYPE for this function.
6771 FUNCDEF_FLAG is true for a function definition, false for
6772 a mere declaration. A nonempty identifier-list gets an error message
6773 when FUNCDEF_FLAG is false. */
6776 grokparms (struct c_arg_info
*arg_info
, bool funcdef_flag
)
6778 tree arg_types
= arg_info
->types
;
6780 if (funcdef_flag
&& arg_info
->had_vla_unspec
)
6782 /* A function definition isn't function prototype scope C99 6.2.1p4. */
6784 error ("%<[*]%> not allowed in other than function prototype scope");
6787 if (arg_types
== 0 && !funcdef_flag
6788 && !in_system_header_at (input_location
))
6789 warning (OPT_Wstrict_prototypes
,
6790 "function declaration isn%'t a prototype");
6792 if (arg_types
== error_mark_node
)
6793 return 0; /* don't set TYPE_ARG_TYPES in this case */
6795 else if (arg_types
&& TREE_CODE (TREE_VALUE (arg_types
)) == IDENTIFIER_NODE
)
6799 pedwarn (input_location
, 0, "parameter names (without types) in function declaration");
6800 arg_info
->parms
= NULL_TREE
;
6803 arg_info
->parms
= arg_info
->types
;
6805 arg_info
->types
= 0;
6810 tree parm
, type
, typelt
;
6811 unsigned int parmno
;
6814 /* If there is a parameter of incomplete type in a definition,
6815 this is an error. In a declaration this is valid, and a
6816 struct or union type may be completed later, before any calls
6817 or definition of the function. In the case where the tag was
6818 first declared within the parameter list, a warning has
6819 already been given. If a parameter has void type, then
6820 however the function cannot be defined or called, so
6823 for (parm
= arg_info
->parms
, typelt
= arg_types
, parmno
= 1;
6825 parm
= DECL_CHAIN (parm
), typelt
= TREE_CHAIN (typelt
), parmno
++)
6827 type
= TREE_VALUE (typelt
);
6828 if (type
== error_mark_node
)
6831 if (!COMPLETE_TYPE_P (type
))
6835 if (DECL_NAME (parm
))
6836 error_at (input_location
,
6837 "parameter %u (%q+D) has incomplete type",
6840 error_at (DECL_SOURCE_LOCATION (parm
),
6841 "parameter %u has incomplete type",
6844 TREE_VALUE (typelt
) = error_mark_node
;
6845 TREE_TYPE (parm
) = error_mark_node
;
6846 arg_types
= NULL_TREE
;
6848 else if (VOID_TYPE_P (type
))
6850 if (DECL_NAME (parm
))
6851 warning_at (input_location
, 0,
6852 "parameter %u (%q+D) has void type",
6855 warning_at (DECL_SOURCE_LOCATION (parm
), 0,
6856 "parameter %u has void type",
6861 errmsg
= targetm
.invalid_parameter_type (type
);
6865 TREE_VALUE (typelt
) = error_mark_node
;
6866 TREE_TYPE (parm
) = error_mark_node
;
6867 arg_types
= NULL_TREE
;
6870 if (DECL_NAME (parm
) && TREE_USED (parm
))
6871 warn_if_shadowing (parm
);
6877 /* Allocate and initialize a c_arg_info structure from the parser's
6881 build_arg_info (void)
6883 struct c_arg_info
*ret
= XOBNEW (&parser_obstack
, struct c_arg_info
);
6884 ret
->parms
= NULL_TREE
;
6886 ret
->types
= NULL_TREE
;
6887 ret
->others
= NULL_TREE
;
6888 ret
->pending_sizes
= NULL
;
6889 ret
->had_vla_unspec
= 0;
6893 /* Take apart the current scope and return a c_arg_info structure with
6894 info on a parameter list just parsed.
6896 This structure is later fed to 'grokparms' and 'store_parm_decls'.
6898 ELLIPSIS being true means the argument list ended in '...' so don't
6899 append a sentinel (void_list_node) to the end of the type-list.
6901 EXPR is NULL or an expression that needs to be evaluated for the
6902 side effects of array size expressions in the parameters. */
6905 get_parm_info (bool ellipsis
, tree expr
)
6907 struct c_binding
*b
= current_scope
->bindings
;
6908 struct c_arg_info
*arg_info
= build_arg_info ();
6911 vec
<c_arg_tag
, va_gc
> *tags
= NULL
;
6915 bool gave_void_only_once_err
= false;
6917 arg_info
->had_vla_unspec
= current_scope
->had_vla_unspec
;
6919 /* The bindings in this scope must not get put into a block.
6920 We will take care of deleting the binding nodes. */
6921 current_scope
->bindings
= 0;
6923 /* This function is only called if there was *something* on the
6927 /* A parameter list consisting solely of 'void' indicates that the
6928 function takes no arguments. But if the 'void' is qualified
6929 (by 'const' or 'volatile'), or has a storage class specifier
6930 ('register'), then the behavior is undefined; issue an error.
6931 Typedefs for 'void' are OK (see DR#157). */
6932 if (b
->prev
== 0 /* one binding */
6933 && TREE_CODE (b
->decl
) == PARM_DECL
/* which is a parameter */
6934 && !DECL_NAME (b
->decl
) /* anonymous */
6935 && VOID_TYPE_P (TREE_TYPE (b
->decl
))) /* of void type */
6937 if (TYPE_QUALS (TREE_TYPE (b
->decl
)) != TYPE_UNQUALIFIED
6938 || C_DECL_REGISTER (b
->decl
))
6939 error_at (b
->locus
, "%<void%> as only parameter may not be qualified");
6941 /* There cannot be an ellipsis. */
6943 error_at (b
->locus
, "%<void%> must be the only parameter");
6945 arg_info
->types
= void_list_node
;
6950 types
= void_list_node
;
6952 /* Break up the bindings list into parms, tags, types, and others;
6953 apply sanity checks; purge the name-to-decl bindings. */
6956 tree decl
= b
->decl
;
6957 tree type
= TREE_TYPE (decl
);
6959 const char *keyword
;
6961 switch (TREE_CODE (decl
))
6966 gcc_assert (I_SYMBOL_BINDING (b
->id
) == b
);
6967 I_SYMBOL_BINDING (b
->id
) = b
->shadowed
;
6970 /* Check for forward decls that never got their actual decl. */
6971 if (TREE_ASM_WRITTEN (decl
))
6973 "parameter %q+D has just a forward declaration", decl
);
6974 /* Check for (..., void, ...) and issue an error. */
6975 else if (VOID_TYPE_P (type
) && !DECL_NAME (decl
))
6977 if (!gave_void_only_once_err
)
6979 error_at (b
->locus
, "%<void%> must be the only parameter");
6980 gave_void_only_once_err
= true;
6985 /* Valid parameter, add it to the list. */
6986 DECL_CHAIN (decl
) = parms
;
6989 /* Since there is a prototype, args are passed in their
6990 declared types. The back end may override this later. */
6991 DECL_ARG_TYPE (decl
) = type
;
6992 types
= tree_cons (0, type
, types
);
6996 case ENUMERAL_TYPE
: keyword
= "enum"; goto tag
;
6997 case UNION_TYPE
: keyword
= "union"; goto tag
;
6998 case RECORD_TYPE
: keyword
= "struct"; goto tag
;
7000 /* Types may not have tag-names, in which case the type
7001 appears in the bindings list with b->id NULL. */
7004 gcc_assert (I_TAG_BINDING (b
->id
) == b
);
7005 I_TAG_BINDING (b
->id
) = b
->shadowed
;
7008 /* Warn about any struct, union or enum tags defined in a
7009 parameter list. The scope of such types is limited to
7010 the parameter list, which is rarely if ever desirable
7011 (it's impossible to call such a function with type-
7012 correct arguments). An anonymous union parm type is
7013 meaningful as a GNU extension, so don't warn for that. */
7014 if (TREE_CODE (decl
) != UNION_TYPE
|| b
->id
!= 0)
7017 /* The %s will be one of 'struct', 'union', or 'enum'. */
7018 warning_at (b
->locus
, 0,
7019 "%<%s %E%> declared inside parameter list"
7020 " will not be visible outside of this definition or"
7021 " declaration", keyword
, b
->id
);
7023 /* The %s will be one of 'struct', 'union', or 'enum'. */
7024 warning_at (b
->locus
, 0,
7025 "anonymous %s declared inside parameter list"
7026 " will not be visible outside of this definition or"
7027 " declaration", keyword
);
7032 vec_safe_push (tags
, tag
);
7038 /* CONST_DECLs appear here when we have an embedded enum,
7039 and TYPE_DECLs appear here when we have an embedded struct
7040 or union. No warnings for this - we already warned about the
7041 type itself. FUNCTION_DECLs appear when there is an implicit
7042 function declaration in the parameter list. */
7044 /* When we reinsert this decl in the function body, we need
7045 to reconstruct whether it was marked as nested. */
7046 gcc_assert (TREE_CODE (decl
) == FUNCTION_DECL
7049 DECL_CHAIN (decl
) = others
;
7054 /* error_mark_node appears here when we have an undeclared
7055 variable. Just throw it away. */
7058 gcc_assert (I_SYMBOL_BINDING (b
->id
) == b
);
7059 I_SYMBOL_BINDING (b
->id
) = b
->shadowed
;
7063 /* Other things that might be encountered. */
7070 b
= free_binding_and_advance (b
);
7073 arg_info
->parms
= parms
;
7074 arg_info
->tags
= tags
;
7075 arg_info
->types
= types
;
7076 arg_info
->others
= others
;
7077 arg_info
->pending_sizes
= expr
;
7081 /* Get the struct, enum or union (CODE says which) with tag NAME.
7082 Define the tag as a forward-reference with location LOC if it is
7083 not defined. Return a c_typespec structure for the type
7087 parser_xref_tag (location_t loc
, enum tree_code code
, tree name
)
7089 struct c_typespec ret
;
7093 ret
.expr
= NULL_TREE
;
7094 ret
.expr_const_operands
= true;
7096 /* If a cross reference is requested, look up the type
7097 already defined for this tag and return it. */
7099 ref
= lookup_tag (code
, name
, false, &refloc
);
7100 /* If this is the right type of tag, return what we found.
7101 (This reference will be shadowed by shadow_tag later if appropriate.)
7102 If this is the wrong type of tag, do not return it. If it was the
7103 wrong type in the same scope, we will have had an error
7104 message already; if in a different scope and declaring
7105 a name, pending_xref_error will give an error message; but if in a
7106 different scope and not declaring a name, this tag should
7107 shadow the previous declaration of a different type of tag, and
7108 this would not work properly if we return the reference found.
7109 (For example, with "struct foo" in an outer scope, "union foo;"
7110 must shadow that tag with a new one of union type.) */
7111 ret
.kind
= (ref
? ctsk_tagref
: ctsk_tagfirstref
);
7112 if (ref
&& TREE_CODE (ref
) == code
)
7114 if (C_TYPE_DEFINED_IN_STRUCT (ref
)
7115 && loc
!= UNKNOWN_LOCATION
7121 warning_at (loc
, OPT_Wc___compat
,
7122 ("enum type defined in struct or union "
7123 "is not visible in C++"));
7124 inform (refloc
, "enum type defined here");
7127 warning_at (loc
, OPT_Wc___compat
,
7128 ("struct defined in struct or union "
7129 "is not visible in C++"));
7130 inform (refloc
, "struct defined here");
7133 warning_at (loc
, OPT_Wc___compat
,
7134 ("union defined in struct or union "
7135 "is not visible in C++"));
7136 inform (refloc
, "union defined here");
7147 /* If no such tag is yet defined, create a forward-reference node
7148 and record it as the "definition".
7149 When a real declaration of this type is found,
7150 the forward-reference will be altered into a real type. */
7152 ref
= make_node (code
);
7153 if (code
== ENUMERAL_TYPE
)
7155 /* Give the type a default layout like unsigned int
7156 to avoid crashing if it does not get defined. */
7157 SET_TYPE_MODE (ref
, TYPE_MODE (unsigned_type_node
));
7158 TYPE_ALIGN (ref
) = TYPE_ALIGN (unsigned_type_node
);
7159 TYPE_USER_ALIGN (ref
) = 0;
7160 TYPE_UNSIGNED (ref
) = 1;
7161 TYPE_PRECISION (ref
) = TYPE_PRECISION (unsigned_type_node
);
7162 TYPE_MIN_VALUE (ref
) = TYPE_MIN_VALUE (unsigned_type_node
);
7163 TYPE_MAX_VALUE (ref
) = TYPE_MAX_VALUE (unsigned_type_node
);
7166 pushtag (loc
, name
, ref
);
7172 /* Get the struct, enum or union (CODE says which) with tag NAME.
7173 Define the tag as a forward-reference if it is not defined.
7174 Return a tree for the type. */
7177 xref_tag (enum tree_code code
, tree name
)
7179 return parser_xref_tag (input_location
, code
, name
).spec
;
7182 /* Make sure that the tag NAME is defined *in the current scope*
7183 at least as a forward reference.
7184 LOC is the location of the struct's definition.
7185 CODE says which kind of tag NAME ought to be.
7187 This stores the current value of the file static STRUCT_PARSE_INFO
7188 in *ENCLOSING_STRUCT_PARSE_INFO, and points STRUCT_PARSE_INFO at a
7189 new c_struct_parse_info structure. The old value of
7190 STRUCT_PARSE_INFO is restored in finish_struct. */
7193 start_struct (location_t loc
, enum tree_code code
, tree name
,
7194 struct c_struct_parse_info
**enclosing_struct_parse_info
)
7196 /* If there is already a tag defined at this scope
7197 (as a forward reference), just return it. */
7199 tree ref
= NULL_TREE
;
7200 location_t refloc
= UNKNOWN_LOCATION
;
7202 if (name
!= NULL_TREE
)
7203 ref
= lookup_tag (code
, name
, true, &refloc
);
7204 if (ref
&& TREE_CODE (ref
) == code
)
7206 if (TYPE_SIZE (ref
))
7208 if (code
== UNION_TYPE
)
7209 error_at (loc
, "redefinition of %<union %E%>", name
);
7211 error_at (loc
, "redefinition of %<struct %E%>", name
);
7212 if (refloc
!= UNKNOWN_LOCATION
)
7213 inform (refloc
, "originally defined here");
7214 /* Don't create structures using a name already in use. */
7217 else if (C_TYPE_BEING_DEFINED (ref
))
7219 if (code
== UNION_TYPE
)
7220 error_at (loc
, "nested redefinition of %<union %E%>", name
);
7222 error_at (loc
, "nested redefinition of %<struct %E%>", name
);
7223 /* Don't bother to report "originally defined here" for a
7224 nested redefinition; the original definition should be
7226 /* Don't create structures that contain themselves. */
7231 /* Otherwise create a forward-reference just so the tag is in scope. */
7233 if (ref
== NULL_TREE
|| TREE_CODE (ref
) != code
)
7235 ref
= make_node (code
);
7236 pushtag (loc
, name
, ref
);
7239 C_TYPE_BEING_DEFINED (ref
) = 1;
7240 for (tree v
= TYPE_MAIN_VARIANT (ref
); v
; v
= TYPE_NEXT_VARIANT (v
))
7241 TYPE_PACKED (v
) = flag_pack_struct
;
7243 *enclosing_struct_parse_info
= struct_parse_info
;
7244 struct_parse_info
= XNEW (struct c_struct_parse_info
);
7245 struct_parse_info
->struct_types
.create (0);
7246 struct_parse_info
->fields
.create (0);
7247 struct_parse_info
->typedefs_seen
.create (0);
7249 /* FIXME: This will issue a warning for a use of a type defined
7250 within a statement expr used within sizeof, et. al. This is not
7251 terribly serious as C++ doesn't permit statement exprs within
7253 if (warn_cxx_compat
&& (in_sizeof
|| in_typeof
|| in_alignof
))
7254 warning_at (loc
, OPT_Wc___compat
,
7255 "defining type in %qs expression is invalid in C++",
7258 : (in_typeof
? "typeof" : "alignof")));
7263 /* Process the specs, declarator and width (NULL if omitted)
7264 of a structure component, returning a FIELD_DECL node.
7265 WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node.
7266 DECL_ATTRS is as for grokdeclarator.
7268 LOC is the location of the structure component.
7270 This is done during the parsing of the struct declaration.
7271 The FIELD_DECL nodes are chained together and the lot of them
7272 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
7275 grokfield (location_t loc
,
7276 struct c_declarator
*declarator
, struct c_declspecs
*declspecs
,
7277 tree width
, tree
*decl_attrs
)
7281 if (declarator
->kind
== cdk_id
&& declarator
->u
.id
== NULL_TREE
7282 && width
== NULL_TREE
)
7284 /* This is an unnamed decl.
7286 If we have something of the form "union { list } ;" then this
7287 is the anonymous union extension. Similarly for struct.
7289 If this is something of the form "struct foo;", then
7290 If MS or Plan 9 extensions are enabled, this is handled as
7291 an anonymous struct.
7292 Otherwise this is a forward declaration of a structure tag.
7294 If this is something of the form "foo;" and foo is a TYPE_DECL, then
7295 If foo names a structure or union without a tag, then this
7296 is an anonymous struct (this is permitted by C11).
7297 If MS or Plan 9 extensions are enabled and foo names a
7298 structure, then again this is an anonymous struct.
7299 Otherwise this is an error.
7301 Oh what a horrid tangled web we weave. I wonder if MS consciously
7302 took this from Plan 9 or if it was an accident of implementation
7303 that took root before someone noticed the bug... */
7305 tree type
= declspecs
->type
;
7306 bool type_ok
= RECORD_OR_UNION_TYPE_P (type
);
7310 && (flag_ms_extensions
7311 || flag_plan9_extensions
7312 || !declspecs
->typedef_p
))
7314 if (flag_ms_extensions
|| flag_plan9_extensions
)
7316 else if (TYPE_NAME (type
) == NULL
)
7323 pedwarn (loc
, 0, "declaration does not declare anything");
7327 pedwarn_c99 (loc
, OPT_Wpedantic
,
7328 "ISO C99 doesn%'t support unnamed structs/unions");
7330 pedwarn_c99 (loc
, OPT_Wpedantic
,
7331 "ISO C90 doesn%'t support unnamed structs/unions");
7334 value
= grokdeclarator (declarator
, declspecs
, FIELD
, false,
7335 width
? &width
: NULL
, decl_attrs
, NULL
, NULL
,
7338 finish_decl (value
, loc
, NULL_TREE
, NULL_TREE
, NULL_TREE
);
7339 DECL_INITIAL (value
) = width
;
7341 if (warn_cxx_compat
&& DECL_NAME (value
) != NULL_TREE
)
7343 /* If we currently have a binding for this field, set the
7344 in_struct field in the binding, so that we warn about lookups
7346 struct c_binding
*b
= I_SYMBOL_BINDING (DECL_NAME (value
));
7349 /* If the in_struct field is not yet set, push it on a list
7350 to be cleared when this struct is finished. */
7353 struct_parse_info
->fields
.safe_push (b
);
7362 /* Subroutine of detect_field_duplicates: return whether X and Y,
7363 which are both fields in the same struct, have duplicate field
7367 is_duplicate_field (tree x
, tree y
)
7369 if (DECL_NAME (x
) != NULL_TREE
&& DECL_NAME (x
) == DECL_NAME (y
))
7372 /* When using -fplan9-extensions, an anonymous field whose name is a
7373 typedef can duplicate a field name. */
7374 if (flag_plan9_extensions
7375 && (DECL_NAME (x
) == NULL_TREE
|| DECL_NAME (y
) == NULL_TREE
))
7377 tree xt
, xn
, yt
, yn
;
7380 if (DECL_NAME (x
) != NULL_TREE
)
7382 else if (RECORD_OR_UNION_TYPE_P (xt
)
7383 && TYPE_NAME (xt
) != NULL_TREE
7384 && TREE_CODE (TYPE_NAME (xt
)) == TYPE_DECL
)
7385 xn
= DECL_NAME (TYPE_NAME (xt
));
7390 if (DECL_NAME (y
) != NULL_TREE
)
7392 else if (RECORD_OR_UNION_TYPE_P (yt
)
7393 && TYPE_NAME (yt
) != NULL_TREE
7394 && TREE_CODE (TYPE_NAME (yt
)) == TYPE_DECL
)
7395 yn
= DECL_NAME (TYPE_NAME (yt
));
7399 if (xn
!= NULL_TREE
&& xn
== yn
)
7406 /* Subroutine of detect_field_duplicates: add the fields of FIELDLIST
7407 to HTAB, giving errors for any duplicates. */
7410 detect_field_duplicates_hash (tree fieldlist
,
7411 hash_table
<nofree_ptr_hash
<tree_node
> > *htab
)
7416 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
7417 if ((y
= DECL_NAME (x
)) != 0)
7419 slot
= htab
->find_slot (y
, INSERT
);
7422 error ("duplicate member %q+D", x
);
7423 DECL_NAME (x
) = NULL_TREE
;
7427 else if (RECORD_OR_UNION_TYPE_P (TREE_TYPE (x
)))
7429 detect_field_duplicates_hash (TYPE_FIELDS (TREE_TYPE (x
)), htab
);
7431 /* When using -fplan9-extensions, an anonymous field whose
7432 name is a typedef can duplicate a field name. */
7433 if (flag_plan9_extensions
7434 && TYPE_NAME (TREE_TYPE (x
)) != NULL_TREE
7435 && TREE_CODE (TYPE_NAME (TREE_TYPE (x
))) == TYPE_DECL
)
7437 tree xn
= DECL_NAME (TYPE_NAME (TREE_TYPE (x
)));
7438 slot
= htab
->find_slot (xn
, INSERT
);
7440 error ("duplicate member %q+D", TYPE_NAME (TREE_TYPE (x
)));
7446 /* Generate an error for any duplicate field names in FIELDLIST. Munge
7447 the list such that this does not present a problem later. */
7450 detect_field_duplicates (tree fieldlist
)
7455 /* If the struct is the list of instance variables of an Objective-C
7456 class, then we need to check all the instance variables of
7457 superclasses when checking for duplicates (since you can't have
7458 an instance variable in a subclass with the same name as an
7459 instance variable in a superclass). We pass on this job to the
7460 Objective-C compiler. objc_detect_field_duplicates() will return
7461 false if we are not checking the list of instance variables and
7462 the C frontend should proceed with the standard field duplicate
7463 checks. If we are checking the list of instance variables, the
7464 ObjC frontend will do the check, emit the errors if needed, and
7465 then return true. */
7466 if (c_dialect_objc ())
7467 if (objc_detect_field_duplicates (false))
7470 /* First, see if there are more than "a few" fields.
7471 This is trivially true if there are zero or one fields. */
7472 if (!fieldlist
|| !DECL_CHAIN (fieldlist
))
7477 if (DECL_NAME (x
) == NULL_TREE
7478 && RECORD_OR_UNION_TYPE_P (TREE_TYPE (x
)))
7481 } while (timeout
> 0 && x
);
7483 /* If there were "few" fields and no anonymous structures or unions,
7484 avoid the overhead of allocating a hash table. Instead just do
7485 the nested traversal thing. */
7488 for (x
= DECL_CHAIN (fieldlist
); x
; x
= DECL_CHAIN (x
))
7489 /* When using -fplan9-extensions, we can have duplicates
7490 between typedef names and fields. */
7492 || (flag_plan9_extensions
7493 && DECL_NAME (x
) == NULL_TREE
7494 && RECORD_OR_UNION_TYPE_P (TREE_TYPE (x
))
7495 && TYPE_NAME (TREE_TYPE (x
)) != NULL_TREE
7496 && TREE_CODE (TYPE_NAME (TREE_TYPE (x
))) == TYPE_DECL
))
7498 for (y
= fieldlist
; y
!= x
; y
= TREE_CHAIN (y
))
7499 if (is_duplicate_field (y
, x
))
7501 error ("duplicate member %q+D", x
);
7502 DECL_NAME (x
) = NULL_TREE
;
7508 hash_table
<nofree_ptr_hash
<tree_node
> > htab (37);
7509 detect_field_duplicates_hash (fieldlist
, &htab
);
7513 /* Finish up struct info used by -Wc++-compat. */
7516 warn_cxx_compat_finish_struct (tree fieldlist
, enum tree_code code
,
7517 location_t record_loc
)
7521 struct c_binding
*b
;
7523 if (fieldlist
== NULL_TREE
)
7525 if (code
== RECORD_TYPE
)
7526 warning_at (record_loc
, OPT_Wc___compat
,
7527 "empty struct has size 0 in C, size 1 in C++");
7529 warning_at (record_loc
, OPT_Wc___compat
,
7530 "empty union has size 0 in C, size 1 in C++");
7533 /* Set the C_TYPE_DEFINED_IN_STRUCT flag for each type defined in
7534 the current struct. We do this now at the end of the struct
7535 because the flag is used to issue visibility warnings, and we
7536 only want to issue those warnings if the type is referenced
7537 outside of the struct declaration. */
7538 FOR_EACH_VEC_ELT (struct_parse_info
->struct_types
, ix
, x
)
7539 C_TYPE_DEFINED_IN_STRUCT (x
) = 1;
7541 /* The TYPEDEFS_SEEN field of STRUCT_PARSE_INFO is a list of
7542 typedefs used when declaring fields in this struct. If the name
7543 of any of the fields is also a typedef name then the struct would
7544 not parse in C++, because the C++ lookup rules say that the
7545 typedef name would be looked up in the context of the struct, and
7546 would thus be the field rather than the typedef. */
7547 if (!struct_parse_info
->typedefs_seen
.is_empty ()
7548 && fieldlist
!= NULL_TREE
)
7550 /* Use a hash_set<tree> using the name of the typedef. We can use
7551 a hash_set<tree> because identifiers are interned. */
7552 hash_set
<tree
> tset
;
7554 FOR_EACH_VEC_ELT (struct_parse_info
->typedefs_seen
, ix
, x
)
7555 tset
.add (DECL_NAME (x
));
7557 for (x
= fieldlist
; x
!= NULL_TREE
; x
= DECL_CHAIN (x
))
7559 if (DECL_NAME (x
) != NULL_TREE
7560 && tset
.contains (DECL_NAME (x
)))
7562 warning_at (DECL_SOURCE_LOCATION (x
), OPT_Wc___compat
,
7563 ("using %qD as both field and typedef name is "
7566 /* FIXME: It would be nice to report the location where
7567 the typedef name is used. */
7572 /* For each field which has a binding and which was not defined in
7573 an enclosing struct, clear the in_struct field. */
7574 FOR_EACH_VEC_ELT (struct_parse_info
->fields
, ix
, b
)
7578 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
7579 LOC is the location of the RECORD_TYPE or UNION_TYPE's definition.
7580 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
7581 ATTRIBUTES are attributes to be applied to the structure.
7583 ENCLOSING_STRUCT_PARSE_INFO is the value of STRUCT_PARSE_INFO when
7584 the struct was started. */
7587 finish_struct (location_t loc
, tree t
, tree fieldlist
, tree attributes
,
7588 struct c_struct_parse_info
*enclosing_struct_parse_info
)
7591 bool toplevel
= file_scope
== current_scope
;
7592 int saw_named_field
;
7594 /* If this type was previously laid out as a forward reference,
7595 make sure we lay it out again. */
7599 decl_attributes (&t
, attributes
, (int) ATTR_FLAG_TYPE_IN_PLACE
);
7603 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
7605 if (DECL_NAME (x
) != 0)
7607 if (flag_isoc11
&& RECORD_OR_UNION_TYPE_P (TREE_TYPE (x
)))
7613 if (TREE_CODE (t
) == UNION_TYPE
)
7616 pedwarn (loc
, OPT_Wpedantic
, "union has no named members");
7618 pedwarn (loc
, OPT_Wpedantic
, "union has no members");
7623 pedwarn (loc
, OPT_Wpedantic
, "struct has no named members");
7625 pedwarn (loc
, OPT_Wpedantic
, "struct has no members");
7630 /* Install struct as DECL_CONTEXT of each field decl.
7631 Also process specified field sizes, found in the DECL_INITIAL,
7632 storing 0 there after the type has been changed to precision equal
7633 to its width, rather than the precision of the specified standard
7634 type. (Correct layout requires the original type to have been preserved
7637 saw_named_field
= 0;
7638 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
7640 if (TREE_TYPE (x
) == error_mark_node
)
7643 DECL_CONTEXT (x
) = t
;
7645 /* If any field is const, the structure type is pseudo-const. */
7646 if (TREE_READONLY (x
))
7647 C_TYPE_FIELDS_READONLY (t
) = 1;
7650 /* A field that is pseudo-const makes the structure likewise. */
7651 tree t1
= strip_array_types (TREE_TYPE (x
));
7652 if (RECORD_OR_UNION_TYPE_P (t1
) && C_TYPE_FIELDS_READONLY (t1
))
7653 C_TYPE_FIELDS_READONLY (t
) = 1;
7656 /* Any field that is volatile means variables of this type must be
7657 treated in some ways as volatile. */
7658 if (TREE_THIS_VOLATILE (x
))
7659 C_TYPE_FIELDS_VOLATILE (t
) = 1;
7661 /* Any field of nominal variable size implies structure is too. */
7662 if (C_DECL_VARIABLE_SIZE (x
))
7663 C_TYPE_VARIABLE_SIZE (t
) = 1;
7665 if (DECL_INITIAL (x
))
7667 unsigned HOST_WIDE_INT width
= tree_to_uhwi (DECL_INITIAL (x
));
7668 DECL_SIZE (x
) = bitsize_int (width
);
7669 DECL_BIT_FIELD (x
) = 1;
7670 SET_DECL_C_BIT_FIELD (x
);
7674 && (DECL_BIT_FIELD (x
)
7675 || TYPE_ALIGN (TREE_TYPE (x
)) > BITS_PER_UNIT
))
7676 DECL_PACKED (x
) = 1;
7678 /* Detect flexible array member in an invalid context. */
7679 if (TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
7680 && TYPE_SIZE (TREE_TYPE (x
)) == NULL_TREE
7681 && TYPE_DOMAIN (TREE_TYPE (x
)) != NULL_TREE
7682 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x
))) == NULL_TREE
)
7684 if (TREE_CODE (t
) == UNION_TYPE
)
7686 error_at (DECL_SOURCE_LOCATION (x
),
7687 "flexible array member in union");
7688 TREE_TYPE (x
) = error_mark_node
;
7690 else if (DECL_CHAIN (x
) != NULL_TREE
)
7692 error_at (DECL_SOURCE_LOCATION (x
),
7693 "flexible array member not at end of struct");
7694 TREE_TYPE (x
) = error_mark_node
;
7696 else if (!saw_named_field
)
7698 error_at (DECL_SOURCE_LOCATION (x
),
7699 "flexible array member in otherwise empty struct");
7700 TREE_TYPE (x
) = error_mark_node
;
7704 if (pedantic
&& TREE_CODE (t
) == RECORD_TYPE
7705 && flexible_array_type_p (TREE_TYPE (x
)))
7706 pedwarn (DECL_SOURCE_LOCATION (x
), OPT_Wpedantic
,
7707 "invalid use of structure with flexible array member");
7710 || RECORD_OR_UNION_TYPE_P (TREE_TYPE (x
)))
7711 saw_named_field
= 1;
7714 detect_field_duplicates (fieldlist
);
7716 /* Now we have the nearly final fieldlist. Record it,
7717 then lay out the structure or union (including the fields). */
7719 TYPE_FIELDS (t
) = fieldlist
;
7721 maybe_apply_pragma_scalar_storage_order (t
);
7725 if (TYPE_SIZE_UNIT (t
)
7726 && TREE_CODE (TYPE_SIZE_UNIT (t
)) == INTEGER_CST
7727 && !TREE_OVERFLOW (TYPE_SIZE_UNIT (t
))
7728 && !valid_constant_size_p (TYPE_SIZE_UNIT (t
)))
7729 error ("type %qT is too large", t
);
7731 /* Give bit-fields their proper types and rewrite the type of array fields
7732 with scalar component if the enclosing type has reverse storage order. */
7733 for (tree field
= fieldlist
; field
; field
= DECL_CHAIN (field
))
7735 if (TREE_CODE (field
) == FIELD_DECL
7736 && DECL_INITIAL (field
)
7737 && TREE_TYPE (field
) != error_mark_node
)
7739 unsigned HOST_WIDE_INT width
7740 = tree_to_uhwi (DECL_INITIAL (field
));
7741 tree type
= TREE_TYPE (field
);
7742 if (width
!= TYPE_PRECISION (type
))
7745 = c_build_bitfield_integer_type (width
, TYPE_UNSIGNED (type
));
7746 DECL_MODE (field
) = TYPE_MODE (TREE_TYPE (field
));
7748 DECL_INITIAL (field
) = 0;
7750 else if (TYPE_REVERSE_STORAGE_ORDER (t
)
7751 && TREE_CODE (field
) == FIELD_DECL
7752 && TREE_CODE (TREE_TYPE (field
)) == ARRAY_TYPE
)
7754 tree ftype
= TREE_TYPE (field
);
7755 tree ctype
= strip_array_types (ftype
);
7756 if (!RECORD_OR_UNION_TYPE_P (ctype
) && TYPE_MODE (ctype
) != QImode
)
7758 tree fmain_type
= TYPE_MAIN_VARIANT (ftype
);
7759 tree
*typep
= &fmain_type
;
7761 *typep
= build_distinct_type_copy (*typep
);
7762 TYPE_REVERSE_STORAGE_ORDER (*typep
) = 1;
7763 typep
= &TREE_TYPE (*typep
);
7764 } while (TREE_CODE (*typep
) == ARRAY_TYPE
);
7766 = c_build_qualified_type (fmain_type
, TYPE_QUALS (ftype
));
7771 /* Now we have the truly final field list.
7772 Store it in this type and in the variants. */
7774 TYPE_FIELDS (t
) = fieldlist
;
7776 /* If there are lots of fields, sort so we can look through them fast.
7777 We arbitrarily consider 16 or more elts to be "a lot". */
7782 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
7784 if (len
> 15 || DECL_NAME (x
) == NULL
)
7792 struct lang_type
*space
;
7793 struct sorted_fields_type
*space2
;
7795 len
+= list_length (x
);
7797 /* Use the same allocation policy here that make_node uses, to
7798 ensure that this lives as long as the rest of the struct decl.
7799 All decls in an inline function need to be saved. */
7801 space
= ggc_cleared_alloc
<struct lang_type
> ();
7802 space2
= (sorted_fields_type
*) ggc_internal_alloc
7803 (sizeof (struct sorted_fields_type
) + len
* sizeof (tree
));
7807 field_array
= &space2
->elts
[0];
7808 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
7810 field_array
[len
++] = x
;
7812 /* If there is anonymous struct or union, break out of the loop. */
7813 if (DECL_NAME (x
) == NULL
)
7816 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
7819 TYPE_LANG_SPECIFIC (t
) = space
;
7820 TYPE_LANG_SPECIFIC (t
)->s
->len
= len
;
7821 field_array
= TYPE_LANG_SPECIFIC (t
)->s
->elts
;
7822 qsort (field_array
, len
, sizeof (tree
), field_decl_cmp
);
7827 for (x
= TYPE_MAIN_VARIANT (t
); x
; x
= TYPE_NEXT_VARIANT (x
))
7829 TYPE_FIELDS (x
) = TYPE_FIELDS (t
);
7830 TYPE_LANG_SPECIFIC (x
) = TYPE_LANG_SPECIFIC (t
);
7831 C_TYPE_FIELDS_READONLY (x
) = C_TYPE_FIELDS_READONLY (t
);
7832 C_TYPE_FIELDS_VOLATILE (x
) = C_TYPE_FIELDS_VOLATILE (t
);
7833 C_TYPE_VARIABLE_SIZE (x
) = C_TYPE_VARIABLE_SIZE (t
);
7836 /* If this was supposed to be a transparent union, but we can't
7837 make it one, warn and turn off the flag. */
7838 if (TREE_CODE (t
) == UNION_TYPE
7839 && TYPE_TRANSPARENT_AGGR (t
)
7840 && (!TYPE_FIELDS (t
) || TYPE_MODE (t
) != DECL_MODE (TYPE_FIELDS (t
))))
7842 TYPE_TRANSPARENT_AGGR (t
) = 0;
7843 warning_at (loc
, 0, "union cannot be made transparent");
7846 /* If this structure or union completes the type of any previous
7847 variable declaration, lay it out and output its rtl.
7849 Note: C_TYPE_INCOMPLETE_VARS overloads TYPE_VFIELD which is used
7850 in dwarf2out via rest_of_decl_compilation below and means
7851 something totally different. Since we will be clearing
7852 C_TYPE_INCOMPLETE_VARS shortly after we iterate through them,
7853 clear it ahead of time and avoid problems in dwarf2out. Ideally,
7854 C_TYPE_INCOMPLETE_VARS should use some language specific
7856 tree incomplete_vars
= C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t
));
7857 C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t
)) = 0;
7858 for (x
= incomplete_vars
; x
; x
= TREE_CHAIN (x
))
7860 tree decl
= TREE_VALUE (x
);
7861 if (TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
)
7862 layout_array_type (TREE_TYPE (decl
));
7863 if (TREE_CODE (decl
) != TYPE_DECL
)
7865 layout_decl (decl
, 0);
7866 if (c_dialect_objc ())
7867 objc_check_decl (decl
);
7868 rest_of_decl_compilation (decl
, toplevel
, 0);
7872 /* Update type location to the one of the definition, instead of e.g.
7873 a forward declaration. */
7874 if (TYPE_STUB_DECL (t
))
7875 DECL_SOURCE_LOCATION (TYPE_STUB_DECL (t
)) = loc
;
7877 /* Finish debugging output for this type. */
7878 rest_of_type_compilation (t
, toplevel
);
7880 /* If we're inside a function proper, i.e. not file-scope and not still
7881 parsing parameters, then arrange for the size of a variable sized type
7883 if (building_stmt_list_p () && variably_modified_type_p (t
, NULL_TREE
))
7884 add_stmt (build_stmt (loc
,
7885 DECL_EXPR
, build_decl (loc
, TYPE_DECL
, NULL
, t
)));
7887 if (warn_cxx_compat
)
7888 warn_cxx_compat_finish_struct (fieldlist
, TREE_CODE (t
), loc
);
7890 struct_parse_info
->struct_types
.release ();
7891 struct_parse_info
->fields
.release ();
7892 struct_parse_info
->typedefs_seen
.release ();
7893 XDELETE (struct_parse_info
);
7895 struct_parse_info
= enclosing_struct_parse_info
;
7897 /* If this struct is defined inside a struct, add it to
7900 && struct_parse_info
!= NULL
7901 && !in_sizeof
&& !in_typeof
&& !in_alignof
)
7902 struct_parse_info
->struct_types
.safe_push (t
);
7907 /* Lay out the type T, and its element type, and so on. */
7910 layout_array_type (tree t
)
7912 if (TREE_CODE (TREE_TYPE (t
)) == ARRAY_TYPE
)
7913 layout_array_type (TREE_TYPE (t
));
7917 /* Begin compiling the definition of an enumeration type.
7918 NAME is its name (or null if anonymous).
7919 LOC is the enum's location.
7920 Returns the type object, as yet incomplete.
7921 Also records info about it so that build_enumerator
7922 may be used to declare the individual values as they are read. */
7925 start_enum (location_t loc
, struct c_enum_contents
*the_enum
, tree name
)
7927 tree enumtype
= NULL_TREE
;
7928 location_t enumloc
= UNKNOWN_LOCATION
;
7930 /* If this is the real definition for a previous forward reference,
7931 fill in the contents in the same object that used to be the
7932 forward reference. */
7934 if (name
!= NULL_TREE
)
7935 enumtype
= lookup_tag (ENUMERAL_TYPE
, name
, true, &enumloc
);
7937 if (enumtype
== NULL_TREE
|| TREE_CODE (enumtype
) != ENUMERAL_TYPE
)
7939 enumtype
= make_node (ENUMERAL_TYPE
);
7940 pushtag (loc
, name
, enumtype
);
7943 if (C_TYPE_BEING_DEFINED (enumtype
))
7944 error_at (loc
, "nested redefinition of %<enum %E%>", name
);
7946 C_TYPE_BEING_DEFINED (enumtype
) = 1;
7948 if (TYPE_VALUES (enumtype
) != 0)
7950 /* This enum is a named one that has been declared already. */
7951 error_at (loc
, "redeclaration of %<enum %E%>", name
);
7952 if (enumloc
!= UNKNOWN_LOCATION
)
7953 inform (enumloc
, "originally defined here");
7955 /* Completely replace its old definition.
7956 The old enumerators remain defined, however. */
7957 TYPE_VALUES (enumtype
) = 0;
7960 the_enum
->enum_next_value
= integer_zero_node
;
7961 the_enum
->enum_overflow
= 0;
7963 if (flag_short_enums
)
7964 for (tree v
= TYPE_MAIN_VARIANT (enumtype
); v
; v
= TYPE_NEXT_VARIANT (v
))
7965 TYPE_PACKED (v
) = 1;
7967 /* FIXME: This will issue a warning for a use of a type defined
7968 within sizeof in a statement expr. This is not terribly serious
7969 as C++ doesn't permit statement exprs within sizeof anyhow. */
7970 if (warn_cxx_compat
&& (in_sizeof
|| in_typeof
|| in_alignof
))
7971 warning_at (loc
, OPT_Wc___compat
,
7972 "defining type in %qs expression is invalid in C++",
7975 : (in_typeof
? "typeof" : "alignof")));
7980 /* After processing and defining all the values of an enumeration type,
7981 install their decls in the enumeration type and finish it off.
7982 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
7983 and ATTRIBUTES are the specified attributes.
7984 Returns ENUMTYPE. */
7987 finish_enum (tree enumtype
, tree values
, tree attributes
)
7990 tree minnode
= 0, maxnode
= 0;
7993 bool toplevel
= (file_scope
== current_scope
);
7994 struct lang_type
*lt
;
7996 decl_attributes (&enumtype
, attributes
, (int) ATTR_FLAG_TYPE_IN_PLACE
);
7998 /* Calculate the maximum value of any enumerator in this type. */
8000 if (values
== error_mark_node
)
8001 minnode
= maxnode
= integer_zero_node
;
8004 minnode
= maxnode
= TREE_VALUE (values
);
8005 for (pair
= TREE_CHAIN (values
); pair
; pair
= TREE_CHAIN (pair
))
8007 tree value
= TREE_VALUE (pair
);
8008 if (tree_int_cst_lt (maxnode
, value
))
8010 if (tree_int_cst_lt (value
, minnode
))
8015 /* Construct the final type of this enumeration. It is the same
8016 as one of the integral types - the narrowest one that fits, except
8017 that normally we only go as narrow as int - and signed iff any of
8018 the values are negative. */
8019 sign
= (tree_int_cst_sgn (minnode
) >= 0) ? UNSIGNED
: SIGNED
;
8020 precision
= MAX (tree_int_cst_min_precision (minnode
, sign
),
8021 tree_int_cst_min_precision (maxnode
, sign
));
8023 if (TYPE_PACKED (enumtype
) || precision
> TYPE_PRECISION (integer_type_node
))
8025 tem
= c_common_type_for_size (precision
, sign
== UNSIGNED
? 1 : 0);
8028 warning (0, "enumeration values exceed range of largest integer");
8029 tem
= long_long_integer_type_node
;
8033 tem
= sign
== UNSIGNED
? unsigned_type_node
: integer_type_node
;
8035 TYPE_MIN_VALUE (enumtype
) = TYPE_MIN_VALUE (tem
);
8036 TYPE_MAX_VALUE (enumtype
) = TYPE_MAX_VALUE (tem
);
8037 TYPE_UNSIGNED (enumtype
) = TYPE_UNSIGNED (tem
);
8038 TYPE_ALIGN (enumtype
) = TYPE_ALIGN (tem
);
8039 TYPE_SIZE (enumtype
) = 0;
8041 /* If the precision of the type was specified with an attribute and it
8042 was too small, give an error. Otherwise, use it. */
8043 if (TYPE_PRECISION (enumtype
)
8044 && lookup_attribute ("mode", attributes
))
8046 if (precision
> TYPE_PRECISION (enumtype
))
8047 error ("specified mode too small for enumeral values");
8050 TYPE_PRECISION (enumtype
) = TYPE_PRECISION (tem
);
8052 layout_type (enumtype
);
8054 if (values
!= error_mark_node
)
8056 /* Change the type of the enumerators to be the enum type. We
8057 need to do this irrespective of the size of the enum, for
8058 proper type checking. Replace the DECL_INITIALs of the
8059 enumerators, and the value slots of the list, with copies
8060 that have the enum type; they cannot be modified in place
8061 because they may be shared (e.g. integer_zero_node) Finally,
8062 change the purpose slots to point to the names of the decls. */
8063 for (pair
= values
; pair
; pair
= TREE_CHAIN (pair
))
8065 tree enu
= TREE_PURPOSE (pair
);
8066 tree ini
= DECL_INITIAL (enu
);
8068 TREE_TYPE (enu
) = enumtype
;
8070 /* The ISO C Standard mandates enumerators to have type int,
8071 even though the underlying type of an enum type is
8072 unspecified. However, GCC allows enumerators of any
8073 integer type as an extensions. build_enumerator()
8074 converts any enumerators that fit in an int to type int,
8075 to avoid promotions to unsigned types when comparing
8076 integers with enumerators that fit in the int range.
8077 When -pedantic is given, build_enumerator() would have
8078 already warned about those that don't fit. Here we
8079 convert the rest to the enumerator type. */
8080 if (TREE_TYPE (ini
) != integer_type_node
)
8081 ini
= convert (enumtype
, ini
);
8083 DECL_INITIAL (enu
) = ini
;
8084 TREE_PURPOSE (pair
) = DECL_NAME (enu
);
8085 TREE_VALUE (pair
) = ini
;
8088 TYPE_VALUES (enumtype
) = values
;
8091 /* Record the min/max values so that we can warn about bit-field
8092 enumerations that are too small for the values. */
8093 lt
= ggc_cleared_alloc
<struct lang_type
> ();
8094 lt
->enum_min
= minnode
;
8095 lt
->enum_max
= maxnode
;
8096 TYPE_LANG_SPECIFIC (enumtype
) = lt
;
8098 /* Fix up all variant types of this enum type. */
8099 for (tem
= TYPE_MAIN_VARIANT (enumtype
); tem
; tem
= TYPE_NEXT_VARIANT (tem
))
8101 if (tem
== enumtype
)
8103 TYPE_VALUES (tem
) = TYPE_VALUES (enumtype
);
8104 TYPE_MIN_VALUE (tem
) = TYPE_MIN_VALUE (enumtype
);
8105 TYPE_MAX_VALUE (tem
) = TYPE_MAX_VALUE (enumtype
);
8106 TYPE_SIZE (tem
) = TYPE_SIZE (enumtype
);
8107 TYPE_SIZE_UNIT (tem
) = TYPE_SIZE_UNIT (enumtype
);
8108 SET_TYPE_MODE (tem
, TYPE_MODE (enumtype
));
8109 TYPE_PRECISION (tem
) = TYPE_PRECISION (enumtype
);
8110 TYPE_ALIGN (tem
) = TYPE_ALIGN (enumtype
);
8111 TYPE_USER_ALIGN (tem
) = TYPE_USER_ALIGN (enumtype
);
8112 TYPE_UNSIGNED (tem
) = TYPE_UNSIGNED (enumtype
);
8113 TYPE_LANG_SPECIFIC (tem
) = TYPE_LANG_SPECIFIC (enumtype
);
8116 /* Finish debugging output for this type. */
8117 rest_of_type_compilation (enumtype
, toplevel
);
8119 /* If this enum is defined inside a struct, add it to
8122 && struct_parse_info
!= NULL
8123 && !in_sizeof
&& !in_typeof
&& !in_alignof
)
8124 struct_parse_info
->struct_types
.safe_push (enumtype
);
8129 /* Build and install a CONST_DECL for one value of the
8130 current enumeration type (one that was begun with start_enum).
8131 DECL_LOC is the location of the enumerator.
8132 LOC is the location of the '=' operator if any, DECL_LOC otherwise.
8133 Return a tree-list containing the CONST_DECL and its value.
8134 Assignment of sequential values by default is handled here. */
8137 build_enumerator (location_t decl_loc
, location_t loc
,
8138 struct c_enum_contents
*the_enum
, tree name
, tree value
)
8142 /* Validate and default VALUE. */
8146 /* Don't issue more errors for error_mark_node (i.e. an
8147 undeclared identifier) - just ignore the value expression. */
8148 if (value
== error_mark_node
)
8150 else if (!INTEGRAL_TYPE_P (TREE_TYPE (value
)))
8152 error_at (loc
, "enumerator value for %qE is not an integer constant",
8158 if (TREE_CODE (value
) != INTEGER_CST
)
8160 value
= c_fully_fold (value
, false, NULL
);
8161 if (TREE_CODE (value
) == INTEGER_CST
)
8162 pedwarn (loc
, OPT_Wpedantic
,
8163 "enumerator value for %qE is not an integer "
8164 "constant expression", name
);
8166 if (TREE_CODE (value
) != INTEGER_CST
)
8168 error ("enumerator value for %qE is not an integer constant",
8174 value
= default_conversion (value
);
8175 constant_expression_warning (value
);
8180 /* Default based on previous value. */
8181 /* It should no longer be possible to have NON_LVALUE_EXPR
8185 value
= the_enum
->enum_next_value
;
8186 if (the_enum
->enum_overflow
)
8187 error_at (loc
, "overflow in enumeration values");
8189 /* Even though the underlying type of an enum is unspecified, the
8190 type of enumeration constants is explicitly defined as int
8191 (6.4.4.3/2 in the C99 Standard). GCC allows any integer type as
8193 else if (!int_fits_type_p (value
, integer_type_node
))
8194 pedwarn (loc
, OPT_Wpedantic
,
8195 "ISO C restricts enumerator values to range of %<int%>");
8197 /* The ISO C Standard mandates enumerators to have type int, even
8198 though the underlying type of an enum type is unspecified.
8199 However, GCC allows enumerators of any integer type as an
8200 extensions. Here we convert any enumerators that fit in an int
8201 to type int, to avoid promotions to unsigned types when comparing
8202 integers with enumerators that fit in the int range. When
8203 -pedantic is given, we would have already warned about those that
8204 don't fit. We have to do this here rather than in finish_enum
8205 because this value may be used to define more enumerators. */
8206 if (int_fits_type_p (value
, integer_type_node
))
8207 value
= convert (integer_type_node
, value
);
8209 /* Set basis for default for next value. */
8210 the_enum
->enum_next_value
8211 = build_binary_op (EXPR_LOC_OR_LOC (value
, input_location
),
8212 PLUS_EXPR
, value
, integer_one_node
, 0);
8213 the_enum
->enum_overflow
= tree_int_cst_lt (the_enum
->enum_next_value
, value
);
8215 /* Now create a declaration for the enum value name. */
8217 type
= TREE_TYPE (value
);
8218 type
= c_common_type_for_size (MAX (TYPE_PRECISION (type
),
8219 TYPE_PRECISION (integer_type_node
)),
8220 (TYPE_PRECISION (type
)
8221 >= TYPE_PRECISION (integer_type_node
)
8222 && TYPE_UNSIGNED (type
)));
8224 decl
= build_decl (decl_loc
, CONST_DECL
, name
, type
);
8225 DECL_INITIAL (decl
) = convert (type
, value
);
8228 return tree_cons (decl
, value
, NULL_TREE
);
8232 /* Create the FUNCTION_DECL for a function definition.
8233 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
8234 the declaration; they describe the function's name and the type it returns,
8235 but twisted together in a fashion that parallels the syntax of C.
8237 This function creates a binding context for the function body
8238 as well as setting up the FUNCTION_DECL in current_function_decl.
8240 Returns 1 on success. If the DECLARATOR is not suitable for a function
8241 (it defines a datum instead), we return 0, which tells
8242 yyparse to report a parse error. */
8245 start_function (struct c_declspecs
*declspecs
, struct c_declarator
*declarator
,
8248 tree decl1
, old_decl
;
8249 tree restype
, resdecl
;
8252 current_function_returns_value
= 0; /* Assume, until we see it does. */
8253 current_function_returns_null
= 0;
8254 current_function_returns_abnormally
= 0;
8255 warn_about_return_type
= 0;
8256 c_switch_stack
= NULL
;
8258 /* Indicate no valid break/continue context by setting these variables
8259 to some non-null, non-label value. We'll notice and emit the proper
8260 error message in c_finish_bc_stmt. */
8261 c_break_label
= c_cont_label
= size_zero_node
;
8263 decl1
= grokdeclarator (declarator
, declspecs
, FUNCDEF
, true, NULL
,
8264 &attributes
, NULL
, NULL
, DEPRECATED_NORMAL
);
8265 invoke_plugin_callbacks (PLUGIN_START_PARSE_FUNCTION
, decl1
);
8267 /* If the declarator is not suitable for a function definition,
8268 cause a syntax error. */
8270 || TREE_CODE (decl1
) != FUNCTION_DECL
)
8273 loc
= DECL_SOURCE_LOCATION (decl1
);
8275 c_decl_attributes (&decl1
, attributes
, 0);
8277 if (DECL_DECLARED_INLINE_P (decl1
)
8278 && DECL_UNINLINABLE (decl1
)
8279 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1
)))
8280 warning_at (loc
, OPT_Wattributes
,
8281 "inline function %qD given attribute noinline",
8284 /* Handle gnu_inline attribute. */
8285 if (declspecs
->inline_p
8286 && !flag_gnu89_inline
8287 && TREE_CODE (decl1
) == FUNCTION_DECL
8288 && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl1
))
8289 || current_function_decl
))
8291 if (declspecs
->storage_class
!= csc_static
)
8292 DECL_EXTERNAL (decl1
) = !DECL_EXTERNAL (decl1
);
8295 announce_function (decl1
);
8297 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1
))))
8299 error_at (loc
, "return type is an incomplete type");
8300 /* Make it return void instead. */
8302 = build_function_type (void_type_node
,
8303 TYPE_ARG_TYPES (TREE_TYPE (decl1
)));
8306 if (warn_about_return_type
)
8307 warn_defaults_to (loc
, flag_isoc99
? OPT_Wimplicit_int
8308 : (warn_return_type
? OPT_Wreturn_type
8309 : OPT_Wimplicit_int
),
8310 "return type defaults to %<int%>");
8312 /* Make the init_value nonzero so pushdecl knows this is not tentative.
8313 error_mark_node is replaced below (in pop_scope) with the BLOCK. */
8314 DECL_INITIAL (decl1
) = error_mark_node
;
8316 /* A nested function is not global. */
8317 if (current_function_decl
!= 0)
8318 TREE_PUBLIC (decl1
) = 0;
8320 /* If this definition isn't a prototype and we had a prototype declaration
8321 before, copy the arg type info from that prototype. */
8322 old_decl
= lookup_name_in_scope (DECL_NAME (decl1
), current_scope
);
8323 if (old_decl
&& TREE_CODE (old_decl
) != FUNCTION_DECL
)
8325 current_function_prototype_locus
= UNKNOWN_LOCATION
;
8326 current_function_prototype_built_in
= false;
8327 current_function_prototype_arg_types
= NULL_TREE
;
8328 if (!prototype_p (TREE_TYPE (decl1
)))
8330 if (old_decl
!= 0 && TREE_CODE (TREE_TYPE (old_decl
)) == FUNCTION_TYPE
8331 && comptypes (TREE_TYPE (TREE_TYPE (decl1
)),
8332 TREE_TYPE (TREE_TYPE (old_decl
))))
8334 if (stdarg_p (TREE_TYPE (old_decl
)))
8336 warning_at (loc
, 0, "%q+D defined as variadic function "
8337 "without prototype", decl1
);
8338 locate_old_decl (old_decl
);
8340 TREE_TYPE (decl1
) = composite_type (TREE_TYPE (old_decl
),
8342 current_function_prototype_locus
= DECL_SOURCE_LOCATION (old_decl
);
8343 current_function_prototype_built_in
8344 = C_DECL_BUILTIN_PROTOTYPE (old_decl
);
8345 current_function_prototype_arg_types
8346 = TYPE_ARG_TYPES (TREE_TYPE (decl1
));
8348 if (TREE_PUBLIC (decl1
))
8350 /* If there is an external prototype declaration of this
8351 function, record its location but do not copy information
8352 to this decl. This may be an invisible declaration
8353 (built-in or in a scope which has finished) or simply
8354 have more refined argument types than any declaration
8356 struct c_binding
*b
;
8357 for (b
= I_SYMBOL_BINDING (DECL_NAME (decl1
)); b
; b
= b
->shadowed
)
8358 if (B_IN_SCOPE (b
, external_scope
))
8362 tree ext_decl
, ext_type
;
8364 ext_type
= b
->u
.type
? b
->u
.type
: TREE_TYPE (ext_decl
);
8365 if (TREE_CODE (ext_type
) == FUNCTION_TYPE
8366 && comptypes (TREE_TYPE (TREE_TYPE (decl1
)),
8367 TREE_TYPE (ext_type
)))
8369 current_function_prototype_locus
8370 = DECL_SOURCE_LOCATION (ext_decl
);
8371 current_function_prototype_built_in
8372 = C_DECL_BUILTIN_PROTOTYPE (ext_decl
);
8373 current_function_prototype_arg_types
8374 = TYPE_ARG_TYPES (ext_type
);
8380 /* Optionally warn of old-fashioned def with no previous prototype. */
8381 if (warn_strict_prototypes
8382 && old_decl
!= error_mark_node
8383 && !prototype_p (TREE_TYPE (decl1
))
8384 && C_DECL_ISNT_PROTOTYPE (old_decl
))
8385 warning_at (loc
, OPT_Wstrict_prototypes
,
8386 "function declaration isn%'t a prototype");
8387 /* Optionally warn of any global def with no previous prototype. */
8388 else if (warn_missing_prototypes
8389 && old_decl
!= error_mark_node
8390 && TREE_PUBLIC (decl1
)
8391 && !MAIN_NAME_P (DECL_NAME (decl1
))
8392 && C_DECL_ISNT_PROTOTYPE (old_decl
)
8393 && !DECL_DECLARED_INLINE_P (decl1
))
8394 warning_at (loc
, OPT_Wmissing_prototypes
,
8395 "no previous prototype for %qD", decl1
);
8396 /* Optionally warn of any def with no previous prototype
8397 if the function has already been used. */
8398 else if (warn_missing_prototypes
8400 && old_decl
!= error_mark_node
8401 && TREE_USED (old_decl
)
8402 && !prototype_p (TREE_TYPE (old_decl
)))
8403 warning_at (loc
, OPT_Wmissing_prototypes
,
8404 "%qD was used with no prototype before its definition", decl1
);
8405 /* Optionally warn of any global def with no previous declaration. */
8406 else if (warn_missing_declarations
8407 && TREE_PUBLIC (decl1
)
8409 && !MAIN_NAME_P (DECL_NAME (decl1
))
8410 && !DECL_DECLARED_INLINE_P (decl1
))
8411 warning_at (loc
, OPT_Wmissing_declarations
,
8412 "no previous declaration for %qD",
8414 /* Optionally warn of any def with no previous declaration
8415 if the function has already been used. */
8416 else if (warn_missing_declarations
8418 && old_decl
!= error_mark_node
8419 && TREE_USED (old_decl
)
8420 && C_DECL_IMPLICIT (old_decl
))
8421 warning_at (loc
, OPT_Wmissing_declarations
,
8422 "%qD was used with no declaration before its definition", decl1
);
8424 /* This function exists in static storage.
8425 (This does not mean `static' in the C sense!) */
8426 TREE_STATIC (decl1
) = 1;
8428 /* This is the earliest point at which we might know the assembler
8429 name of the function. Thus, if it's set before this, die horribly. */
8430 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl1
));
8432 /* If #pragma weak was used, mark the decl weak now. */
8433 if (current_scope
== file_scope
)
8434 maybe_apply_pragma_weak (decl1
);
8436 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
8437 if (warn_main
&& MAIN_NAME_P (DECL_NAME (decl1
)))
8439 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1
)))
8440 != integer_type_node
)
8441 pedwarn (loc
, OPT_Wmain
, "return type of %qD is not %<int%>", decl1
);
8442 else if (TYPE_ATOMIC (TREE_TYPE (TREE_TYPE (decl1
))))
8443 pedwarn (loc
, OPT_Wmain
, "%<_Atomic%>-qualified return type of %qD",
8446 check_main_parameter_types (decl1
);
8448 if (!TREE_PUBLIC (decl1
))
8449 pedwarn (loc
, OPT_Wmain
,
8450 "%qD is normally a non-static function", decl1
);
8453 /* Record the decl so that the function name is defined.
8454 If we already have a decl for this name, and it is a FUNCTION_DECL,
8455 use the old decl. */
8457 current_function_decl
= pushdecl (decl1
);
8460 declare_parm_level ();
8462 restype
= TREE_TYPE (TREE_TYPE (current_function_decl
));
8463 resdecl
= build_decl (loc
, RESULT_DECL
, NULL_TREE
, restype
);
8464 DECL_ARTIFICIAL (resdecl
) = 1;
8465 DECL_IGNORED_P (resdecl
) = 1;
8466 DECL_RESULT (current_function_decl
) = resdecl
;
8468 start_fname_decls ();
8473 /* Subroutine of store_parm_decls which handles new-style function
8474 definitions (prototype format). The parms already have decls, so we
8475 need only record them as in effect and complain if any redundant
8476 old-style parm decls were written. */
8478 store_parm_decls_newstyle (tree fndecl
, const struct c_arg_info
*arg_info
)
8484 if (current_scope
->bindings
)
8486 error_at (DECL_SOURCE_LOCATION (fndecl
),
8487 "old-style parameter declarations in prototyped "
8488 "function definition");
8490 /* Get rid of the old-style declarations. */
8494 /* Don't issue this warning for nested functions, and don't issue this
8495 warning if we got here because ARG_INFO_TYPES was error_mark_node
8496 (this happens when a function definition has just an ellipsis in
8497 its parameter list). */
8498 else if (!in_system_header_at (input_location
)
8499 && !current_function_scope
8500 && arg_info
->types
!= error_mark_node
)
8501 warning_at (DECL_SOURCE_LOCATION (fndecl
), OPT_Wtraditional
,
8502 "traditional C rejects ISO C style function definitions");
8504 /* Now make all the parameter declarations visible in the function body.
8505 We can bypass most of the grunt work of pushdecl. */
8506 for (decl
= arg_info
->parms
; decl
; decl
= DECL_CHAIN (decl
))
8508 DECL_CONTEXT (decl
) = current_function_decl
;
8509 if (DECL_NAME (decl
))
8511 bind (DECL_NAME (decl
), decl
, current_scope
,
8512 /*invisible=*/false, /*nested=*/false,
8514 if (!TREE_USED (decl
))
8515 warn_if_shadowing (decl
);
8518 error_at (DECL_SOURCE_LOCATION (decl
), "parameter name omitted");
8521 /* Record the parameter list in the function declaration. */
8522 DECL_ARGUMENTS (fndecl
) = arg_info
->parms
;
8524 /* Now make all the ancillary declarations visible, likewise. */
8525 for (decl
= arg_info
->others
; decl
; decl
= DECL_CHAIN (decl
))
8527 DECL_CONTEXT (decl
) = current_function_decl
;
8528 if (DECL_NAME (decl
))
8529 bind (DECL_NAME (decl
), decl
, current_scope
,
8530 /*invisible=*/false,
8531 /*nested=*/(TREE_CODE (decl
) == FUNCTION_DECL
),
8535 /* And all the tag declarations. */
8536 FOR_EACH_VEC_SAFE_ELT_REVERSE (arg_info
->tags
, ix
, tag
)
8538 bind (tag
->id
, tag
->type
, current_scope
,
8539 /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION
);
8542 /* Subroutine of store_parm_decls which handles old-style function
8543 definitions (separate parameter list and declarations). */
8546 store_parm_decls_oldstyle (tree fndecl
, const struct c_arg_info
*arg_info
)
8548 struct c_binding
*b
;
8549 tree parm
, decl
, last
;
8550 tree parmids
= arg_info
->parms
;
8551 hash_set
<tree
> seen_args
;
8553 if (!in_system_header_at (input_location
))
8554 warning_at (DECL_SOURCE_LOCATION (fndecl
),
8555 OPT_Wold_style_definition
, "old-style function definition");
8557 /* Match each formal parameter name with its declaration. Save each
8558 decl in the appropriate TREE_PURPOSE slot of the parmids chain. */
8559 for (parm
= parmids
; parm
; parm
= TREE_CHAIN (parm
))
8561 if (TREE_VALUE (parm
) == 0)
8563 error_at (DECL_SOURCE_LOCATION (fndecl
),
8564 "parameter name missing from parameter list");
8565 TREE_PURPOSE (parm
) = 0;
8569 b
= I_SYMBOL_BINDING (TREE_VALUE (parm
));
8570 if (b
&& B_IN_CURRENT_SCOPE (b
))
8573 /* Skip erroneous parameters. */
8574 if (decl
== error_mark_node
)
8576 /* If we got something other than a PARM_DECL it is an error. */
8577 if (TREE_CODE (decl
) != PARM_DECL
)
8578 error_at (DECL_SOURCE_LOCATION (decl
),
8579 "%qD declared as a non-parameter", decl
);
8580 /* If the declaration is already marked, we have a duplicate
8581 name. Complain and ignore the duplicate. */
8582 else if (seen_args
.contains (decl
))
8584 error_at (DECL_SOURCE_LOCATION (decl
),
8585 "multiple parameters named %qD", decl
);
8586 TREE_PURPOSE (parm
) = 0;
8589 /* If the declaration says "void", complain and turn it into
8591 else if (VOID_TYPE_P (TREE_TYPE (decl
)))
8593 error_at (DECL_SOURCE_LOCATION (decl
),
8594 "parameter %qD declared with void type", decl
);
8595 TREE_TYPE (decl
) = integer_type_node
;
8596 DECL_ARG_TYPE (decl
) = integer_type_node
;
8597 layout_decl (decl
, 0);
8599 warn_if_shadowing (decl
);
8601 /* If no declaration found, default to int. */
8604 /* FIXME diagnostics: This should be the location of the argument,
8605 not the FNDECL. E.g., for an old-style declaration
8607 int f10(v) { blah; }
8609 We should use the location of the V, not the F10.
8610 Unfortunately, the V is an IDENTIFIER_NODE which has no
8611 location. In the future we need locations for c_arg_info
8614 See gcc.dg/Wshadow-3.c for an example of this problem. */
8615 decl
= build_decl (DECL_SOURCE_LOCATION (fndecl
),
8616 PARM_DECL
, TREE_VALUE (parm
), integer_type_node
);
8617 DECL_ARG_TYPE (decl
) = TREE_TYPE (decl
);
8619 warn_if_shadowing (decl
);
8622 pedwarn (DECL_SOURCE_LOCATION (decl
),
8623 OPT_Wimplicit_int
, "type of %qD defaults to %<int%>",
8626 warning_at (DECL_SOURCE_LOCATION (decl
),
8627 OPT_Wmissing_parameter_type
,
8628 "type of %qD defaults to %<int%>", decl
);
8631 TREE_PURPOSE (parm
) = decl
;
8632 seen_args
.add (decl
);
8635 /* Now examine the parms chain for incomplete declarations
8636 and declarations with no corresponding names. */
8638 for (b
= current_scope
->bindings
; b
; b
= b
->prev
)
8641 if (TREE_CODE (parm
) != PARM_DECL
)
8644 if (TREE_TYPE (parm
) != error_mark_node
8645 && !COMPLETE_TYPE_P (TREE_TYPE (parm
)))
8647 error_at (DECL_SOURCE_LOCATION (parm
),
8648 "parameter %qD has incomplete type", parm
);
8649 TREE_TYPE (parm
) = error_mark_node
;
8652 if (!seen_args
.contains (parm
))
8654 error_at (DECL_SOURCE_LOCATION (parm
),
8655 "declaration for parameter %qD but no such parameter",
8658 /* Pretend the parameter was not missing.
8659 This gets us to a standard state and minimizes
8660 further error messages. */
8661 parmids
= chainon (parmids
, tree_cons (parm
, 0, 0));
8665 /* Chain the declarations together in the order of the list of
8666 names. Store that chain in the function decl, replacing the
8667 list of names. Update the current scope to match. */
8668 DECL_ARGUMENTS (fndecl
) = 0;
8670 for (parm
= parmids
; parm
; parm
= TREE_CHAIN (parm
))
8671 if (TREE_PURPOSE (parm
))
8673 if (parm
&& TREE_PURPOSE (parm
))
8675 last
= TREE_PURPOSE (parm
);
8676 DECL_ARGUMENTS (fndecl
) = last
;
8678 for (parm
= TREE_CHAIN (parm
); parm
; parm
= TREE_CHAIN (parm
))
8679 if (TREE_PURPOSE (parm
))
8681 DECL_CHAIN (last
) = TREE_PURPOSE (parm
);
8682 last
= TREE_PURPOSE (parm
);
8684 DECL_CHAIN (last
) = 0;
8687 /* If there was a previous prototype,
8688 set the DECL_ARG_TYPE of each argument according to
8689 the type previously specified, and report any mismatches. */
8691 if (current_function_prototype_arg_types
)
8694 for (parm
= DECL_ARGUMENTS (fndecl
),
8695 type
= current_function_prototype_arg_types
;
8696 parm
|| (type
&& TREE_VALUE (type
) != error_mark_node
8697 && (TYPE_MAIN_VARIANT (TREE_VALUE (type
)) != void_type_node
));
8698 parm
= DECL_CHAIN (parm
), type
= TREE_CHAIN (type
))
8700 if (parm
== 0 || type
== 0
8701 || TYPE_MAIN_VARIANT (TREE_VALUE (type
)) == void_type_node
)
8703 if (current_function_prototype_built_in
)
8704 warning_at (DECL_SOURCE_LOCATION (fndecl
),
8705 0, "number of arguments doesn%'t match "
8706 "built-in prototype");
8709 /* FIXME diagnostics: This should be the location of
8710 FNDECL, but there is bug when a prototype is
8711 declared inside function context, but defined
8712 outside of it (e.g., gcc.dg/pr15698-2.c). In
8713 which case FNDECL gets the location of the
8714 prototype, not the definition. */
8715 error_at (input_location
,
8716 "number of arguments doesn%'t match prototype");
8718 error_at (current_function_prototype_locus
,
8719 "prototype declaration");
8723 /* Type for passing arg must be consistent with that
8724 declared for the arg. ISO C says we take the unqualified
8725 type for parameters declared with qualified type. */
8726 if (TREE_TYPE (parm
) != error_mark_node
8727 && TREE_TYPE (type
) != error_mark_node
8728 && ((TYPE_ATOMIC (DECL_ARG_TYPE (parm
))
8729 != TYPE_ATOMIC (TREE_VALUE (type
)))
8730 || !comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm
)),
8731 TYPE_MAIN_VARIANT (TREE_VALUE (type
)))))
8733 if ((TYPE_ATOMIC (DECL_ARG_TYPE (parm
))
8734 == TYPE_ATOMIC (TREE_VALUE (type
)))
8735 && (TYPE_MAIN_VARIANT (TREE_TYPE (parm
))
8736 == TYPE_MAIN_VARIANT (TREE_VALUE (type
))))
8738 /* Adjust argument to match prototype. E.g. a previous
8739 `int foo(float);' prototype causes
8740 `int foo(x) float x; {...}' to be treated like
8741 `int foo(float x) {...}'. This is particularly
8742 useful for argument types like uid_t. */
8743 DECL_ARG_TYPE (parm
) = TREE_TYPE (parm
);
8745 if (targetm
.calls
.promote_prototypes (TREE_TYPE (current_function_decl
))
8746 && INTEGRAL_TYPE_P (TREE_TYPE (parm
))
8747 && TYPE_PRECISION (TREE_TYPE (parm
))
8748 < TYPE_PRECISION (integer_type_node
))
8749 DECL_ARG_TYPE (parm
)
8750 = c_type_promotes_to (TREE_TYPE (parm
));
8752 /* ??? Is it possible to get here with a
8753 built-in prototype or will it always have
8754 been diagnosed as conflicting with an
8755 old-style definition and discarded? */
8756 if (current_function_prototype_built_in
)
8757 warning_at (DECL_SOURCE_LOCATION (parm
),
8758 OPT_Wpedantic
, "promoted argument %qD "
8759 "doesn%'t match built-in prototype", parm
);
8762 pedwarn (DECL_SOURCE_LOCATION (parm
),
8763 OPT_Wpedantic
, "promoted argument %qD "
8764 "doesn%'t match prototype", parm
);
8765 pedwarn (current_function_prototype_locus
, OPT_Wpedantic
,
8766 "prototype declaration");
8771 if (current_function_prototype_built_in
)
8772 warning_at (DECL_SOURCE_LOCATION (parm
),
8773 0, "argument %qD doesn%'t match "
8774 "built-in prototype", parm
);
8777 error_at (DECL_SOURCE_LOCATION (parm
),
8778 "argument %qD doesn%'t match prototype", parm
);
8779 error_at (current_function_prototype_locus
,
8780 "prototype declaration");
8785 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl
)) = 0;
8788 /* Otherwise, create a prototype that would match. */
8792 tree actual
= 0, last
= 0, type
;
8794 for (parm
= DECL_ARGUMENTS (fndecl
); parm
; parm
= DECL_CHAIN (parm
))
8796 type
= tree_cons (NULL_TREE
, DECL_ARG_TYPE (parm
), NULL_TREE
);
8798 TREE_CHAIN (last
) = type
;
8803 type
= tree_cons (NULL_TREE
, void_type_node
, NULL_TREE
);
8805 TREE_CHAIN (last
) = type
;
8809 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
8810 of the type of this function, but we need to avoid having this
8811 affect the types of other similarly-typed functions, so we must
8812 first force the generation of an identical (but separate) type
8813 node for the relevant function type. The new node we create
8814 will be a variant of the main variant of the original function
8817 TREE_TYPE (fndecl
) = build_variant_type_copy (TREE_TYPE (fndecl
));
8819 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl
)) = actual
;
8823 /* Store parameter declarations passed in ARG_INFO into the current
8824 function declaration. */
8827 store_parm_decls_from (struct c_arg_info
*arg_info
)
8829 current_function_arg_info
= arg_info
;
8830 store_parm_decls ();
8833 /* Called by walk_tree to look for and update context-less labels. */
8836 set_labels_context_r (tree
*tp
, int *walk_subtrees
, void *data
)
8838 if (TREE_CODE (*tp
) == LABEL_EXPR
8839 && DECL_CONTEXT (LABEL_EXPR_LABEL (*tp
)) == NULL_TREE
)
8841 DECL_CONTEXT (LABEL_EXPR_LABEL (*tp
)) = static_cast<tree
>(data
);
8848 /* Store the parameter declarations into the current function declaration.
8849 This is called after parsing the parameter declarations, before
8850 digesting the body of the function.
8852 For an old-style definition, construct a prototype out of the old-style
8853 parameter declarations and inject it into the function's type. */
8856 store_parm_decls (void)
8858 tree fndecl
= current_function_decl
;
8861 /* The argument information block for FNDECL. */
8862 struct c_arg_info
*arg_info
= current_function_arg_info
;
8863 current_function_arg_info
= 0;
8865 /* True if this definition is written with a prototype. Note:
8866 despite C99 6.7.5.3p14, we can *not* treat an empty argument
8867 list in a function definition as equivalent to (void) -- an
8868 empty argument list specifies the function has no parameters,
8869 but only (void) sets up a prototype for future calls. */
8870 proto
= arg_info
->types
!= 0;
8873 store_parm_decls_newstyle (fndecl
, arg_info
);
8875 store_parm_decls_oldstyle (fndecl
, arg_info
);
8877 /* The next call to push_scope will be a function body. */
8879 next_is_function_body
= true;
8881 /* Write a record describing this function definition to the prototypes
8882 file (if requested). */
8884 gen_aux_info_record (fndecl
, 1, 0, proto
);
8886 /* Initialize the RTL code for the function. */
8887 allocate_struct_function (fndecl
, false);
8889 if (warn_unused_local_typedefs
)
8890 cfun
->language
= ggc_cleared_alloc
<language_function
> ();
8892 /* Begin the statement tree for this function. */
8893 DECL_SAVED_TREE (fndecl
) = push_stmt_list ();
8895 /* ??? Insert the contents of the pending sizes list into the function
8896 to be evaluated. The only reason left to have this is
8897 void foo(int n, int array[n++])
8898 because we throw away the array type in favor of a pointer type, and
8899 thus won't naturally see the SAVE_EXPR containing the increment. All
8900 other pending sizes would be handled by gimplify_parameters. */
8901 if (arg_info
->pending_sizes
)
8903 /* In very special circumstances, e.g. for code like
8905 void f (int a[i += 2]) {}
8906 we need to execute the atomic assignment on function entry.
8907 But in this case, it is not just a straight store, it has the
8908 op= form, which means that build_atomic_assign has generated
8909 gotos, labels, etc. Because at that time the function decl
8910 for F has not been created yet, those labels do not have any
8911 function context. But we have the fndecl now, so update the
8912 labels accordingly. gimplify_expr would crash otherwise. */
8913 walk_tree_without_duplicates (&arg_info
->pending_sizes
,
8914 set_labels_context_r
, fndecl
);
8915 add_stmt (arg_info
->pending_sizes
);
8919 /* Store PARM_DECLs in PARMS into scope temporarily. Used for
8920 c_finish_omp_declare_simd for function prototypes. No diagnostics
8924 temp_store_parm_decls (tree fndecl
, tree parms
)
8927 for (tree p
= parms
; p
; p
= DECL_CHAIN (p
))
8929 DECL_CONTEXT (p
) = fndecl
;
8931 bind (DECL_NAME (p
), p
, current_scope
,
8932 /*invisible=*/false, /*nested=*/false,
8937 /* Undo what temp_store_parm_decls did. */
8940 temp_pop_parm_decls (void)
8942 /* Clear all bindings in this temporary scope, so that
8943 pop_scope doesn't create a BLOCK. */
8944 struct c_binding
*b
= current_scope
->bindings
;
8945 current_scope
->bindings
= NULL
;
8946 for (; b
; b
= free_binding_and_advance (b
))
8948 gcc_assert (TREE_CODE (b
->decl
) == PARM_DECL
8949 || b
->decl
== error_mark_node
);
8950 gcc_assert (I_SYMBOL_BINDING (b
->id
) == b
);
8951 I_SYMBOL_BINDING (b
->id
) = b
->shadowed
;
8952 if (b
->shadowed
&& b
->shadowed
->u
.type
)
8953 TREE_TYPE (b
->shadowed
->decl
) = b
->shadowed
->u
.type
;
8959 /* Finish up a function declaration and compile that function
8960 all the way to assembler language output. Then free the storage
8961 for the function definition.
8963 This is called after parsing the body of the function definition. */
8966 finish_function (void)
8968 tree fndecl
= current_function_decl
;
8970 if (c_dialect_objc ())
8971 objc_finish_function ();
8973 if (TREE_CODE (fndecl
) == FUNCTION_DECL
8974 && targetm
.calls
.promote_prototypes (TREE_TYPE (fndecl
)))
8976 tree args
= DECL_ARGUMENTS (fndecl
);
8977 for (; args
; args
= DECL_CHAIN (args
))
8979 tree type
= TREE_TYPE (args
);
8980 if (INTEGRAL_TYPE_P (type
)
8981 && TYPE_PRECISION (type
) < TYPE_PRECISION (integer_type_node
))
8982 DECL_ARG_TYPE (args
) = c_type_promotes_to (type
);
8986 if (DECL_INITIAL (fndecl
) && DECL_INITIAL (fndecl
) != error_mark_node
)
8987 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl
)) = fndecl
;
8989 /* Must mark the RESULT_DECL as being in this function. */
8991 if (DECL_RESULT (fndecl
) && DECL_RESULT (fndecl
) != error_mark_node
)
8992 DECL_CONTEXT (DECL_RESULT (fndecl
)) = fndecl
;
8994 if (MAIN_NAME_P (DECL_NAME (fndecl
)) && flag_hosted
8995 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl
)))
8996 == integer_type_node
&& flag_isoc99
)
8998 /* Hack. We don't want the middle-end to warn that this return
8999 is unreachable, so we mark its location as special. Using
9000 UNKNOWN_LOCATION has the problem that it gets clobbered in
9001 annotate_one_with_locus. A cleaner solution might be to
9002 ensure ! should_carry_locus_p (stmt), but that needs a flag.
9004 c_finish_return (BUILTINS_LOCATION
, integer_zero_node
, NULL_TREE
);
9007 /* Tie off the statement tree for this function. */
9008 DECL_SAVED_TREE (fndecl
) = pop_stmt_list (DECL_SAVED_TREE (fndecl
));
9010 /* If the function has _Cilk_spawn in front of a function call inside it
9011 i.e. it is a spawning function, then add the appropriate Cilk plus
9012 functions inside. */
9013 if (fn_contains_cilk_spawn_p (cfun
))
9014 cfun
->cilk_frame_decl
= insert_cilk_frame (fndecl
);
9016 finish_fname_decls ();
9018 /* Complain if there's just no return statement. */
9019 if (warn_return_type
9020 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl
))) != VOID_TYPE
9021 && !current_function_returns_value
&& !current_function_returns_null
9022 /* Don't complain if we are no-return. */
9023 && !current_function_returns_abnormally
9024 /* Don't complain if we are declared noreturn. */
9025 && !TREE_THIS_VOLATILE (fndecl
)
9026 /* Don't warn for main(). */
9027 && !MAIN_NAME_P (DECL_NAME (fndecl
))
9028 /* Or if they didn't actually specify a return type. */
9029 && !C_FUNCTION_IMPLICIT_INT (fndecl
)
9030 /* Normally, with -Wreturn-type, flow will complain, but we might
9031 optimize out static functions. */
9032 && !TREE_PUBLIC (fndecl
))
9034 warning (OPT_Wreturn_type
,
9035 "no return statement in function returning non-void");
9036 TREE_NO_WARNING (fndecl
) = 1;
9039 /* Complain about parameters that are only set, but never otherwise used. */
9040 if (warn_unused_but_set_parameter
)
9044 for (decl
= DECL_ARGUMENTS (fndecl
);
9046 decl
= DECL_CHAIN (decl
))
9047 if (TREE_USED (decl
)
9048 && TREE_CODE (decl
) == PARM_DECL
9049 && !DECL_READ_P (decl
)
9051 && !DECL_ARTIFICIAL (decl
)
9052 && !TREE_NO_WARNING (decl
))
9053 warning_at (DECL_SOURCE_LOCATION (decl
),
9054 OPT_Wunused_but_set_parameter
,
9055 "parameter %qD set but not used", decl
);
9058 /* Complain about locally defined typedefs that are not used in this
9060 maybe_warn_unused_local_typedefs ();
9062 /* Possibly warn about unused parameters. */
9063 if (warn_unused_parameter
)
9064 do_warn_unused_parameter (fndecl
);
9066 /* Store the end of the function, so that we get good line number
9067 info for the epilogue. */
9068 cfun
->function_end_locus
= input_location
;
9070 /* Finalize the ELF visibility for the function. */
9071 c_determine_visibility (fndecl
);
9073 /* For GNU C extern inline functions disregard inline limits. */
9074 if (DECL_EXTERNAL (fndecl
)
9075 && DECL_DECLARED_INLINE_P (fndecl
))
9076 DECL_DISREGARD_INLINE_LIMITS (fndecl
) = 1;
9078 /* Genericize before inlining. Delay genericizing nested functions
9079 until their parent function is genericized. Since finalizing
9080 requires GENERIC, delay that as well. */
9082 if (DECL_INITIAL (fndecl
) && DECL_INITIAL (fndecl
) != error_mark_node
9083 && !undef_nested_function
)
9085 if (!decl_function_context (fndecl
))
9087 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE
, fndecl
);
9088 c_genericize (fndecl
);
9090 /* ??? Objc emits functions after finalizing the compilation unit.
9091 This should be cleaned up later and this conditional removed. */
9092 if (symtab
->global_info_ready
)
9094 cgraph_node::add_new_function (fndecl
, false);
9097 cgraph_node::finalize_function (fndecl
, false);
9101 /* Register this function with cgraph just far enough to get it
9102 added to our parent's nested function list. Handy, since the
9103 C front end doesn't have such a list. */
9104 (void) cgraph_node::get_create (fndecl
);
9108 if (!decl_function_context (fndecl
))
9109 undef_nested_function
= false;
9111 if (cfun
->language
!= NULL
)
9113 ggc_free (cfun
->language
);
9114 cfun
->language
= NULL
;
9117 /* We're leaving the context of this function, so zap cfun.
9118 It's still in DECL_STRUCT_FUNCTION, and we'll restore it in
9119 tree_rest_of_compilation. */
9121 invoke_plugin_callbacks (PLUGIN_FINISH_PARSE_FUNCTION
, current_function_decl
);
9122 current_function_decl
= NULL
;
9125 /* Check the declarations given in a for-loop for satisfying the C99
9126 constraints. If exactly one such decl is found, return it. LOC is
9127 the location of the opening parenthesis of the for loop. The last
9128 parameter allows you to control the "for loop initial declarations
9129 are only allowed in C99 mode". Normally, you should pass
9130 flag_isoc99 as that parameter. But in some cases (Objective-C
9131 foreach loop, for example) we want to run the checks in this
9132 function even if not in C99 mode, so we allow the caller to turn
9133 off the error about not being in C99 mode.
9137 check_for_loop_decls (location_t loc
, bool turn_off_iso_c99_error
)
9139 struct c_binding
*b
;
9140 tree one_decl
= NULL_TREE
;
9143 if (!turn_off_iso_c99_error
)
9145 static bool hint
= true;
9146 /* If we get here, declarations have been used in a for loop without
9147 the C99 for loop scope. This doesn't make much sense, so don't
9149 error_at (loc
, "%<for%> loop initial declarations "
9150 "are only allowed in C99 or C11 mode");
9154 "use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 "
9155 "to compile your code");
9160 /* C99 subclause 6.8.5 paragraph 3:
9162 [#3] The declaration part of a for statement shall only
9163 declare identifiers for objects having storage class auto or
9166 It isn't clear whether, in this sentence, "identifiers" binds to
9167 "shall only declare" or to "objects" - that is, whether all identifiers
9168 declared must be identifiers for objects, or whether the restriction
9169 only applies to those that are. (A question on this in comp.std.c
9170 in November 2000 received no answer.) We implement the strictest
9171 interpretation, to avoid creating an extension which later causes
9174 for (b
= current_scope
->bindings
; b
; b
= b
->prev
)
9177 tree decl
= b
->decl
;
9182 switch (TREE_CODE (decl
))
9186 location_t decl_loc
= DECL_SOURCE_LOCATION (decl
);
9187 if (TREE_STATIC (decl
))
9189 "declaration of static variable %qD in %<for%> loop "
9190 "initial declaration", decl
);
9191 else if (DECL_EXTERNAL (decl
))
9193 "declaration of %<extern%> variable %qD in %<for%> loop "
9194 "initial declaration", decl
);
9200 "%<struct %E%> declared in %<for%> loop initial "
9205 "%<union %E%> declared in %<for%> loop initial declaration",
9209 error_at (loc
, "%<enum %E%> declared in %<for%> loop "
9210 "initial declaration", id
);
9213 error_at (loc
, "declaration of non-variable "
9214 "%qD in %<for%> loop initial declaration", decl
);
9221 return n_decls
== 1 ? one_decl
: NULL_TREE
;
9224 /* Save and reinitialize the variables
9225 used during compilation of a C function. */
9228 c_push_function_context (void)
9230 struct language_function
*p
= cfun
->language
;
9231 /* cfun->language might have been already allocated by the use of
9232 -Wunused-local-typedefs. In that case, just re-use it. */
9234 cfun
->language
= p
= ggc_cleared_alloc
<language_function
> ();
9236 p
->base
.x_stmt_tree
= c_stmt_tree
;
9237 c_stmt_tree
.x_cur_stmt_list
= vec_safe_copy (c_stmt_tree
.x_cur_stmt_list
);
9238 p
->x_break_label
= c_break_label
;
9239 p
->x_cont_label
= c_cont_label
;
9240 p
->x_switch_stack
= c_switch_stack
;
9241 p
->arg_info
= current_function_arg_info
;
9242 p
->returns_value
= current_function_returns_value
;
9243 p
->returns_null
= current_function_returns_null
;
9244 p
->returns_abnormally
= current_function_returns_abnormally
;
9245 p
->warn_about_return_type
= warn_about_return_type
;
9247 push_function_context ();
9250 /* Restore the variables used during compilation of a C function. */
9253 c_pop_function_context (void)
9255 struct language_function
*p
;
9257 pop_function_context ();
9260 /* When -Wunused-local-typedefs is in effect, cfun->languages is
9261 used to store data throughout the life time of the current cfun,
9262 So don't deallocate it. */
9263 if (!warn_unused_local_typedefs
)
9264 cfun
->language
= NULL
;
9266 if (DECL_STRUCT_FUNCTION (current_function_decl
) == 0
9267 && DECL_SAVED_TREE (current_function_decl
) == NULL_TREE
)
9269 /* Stop pointing to the local nodes about to be freed. */
9270 /* But DECL_INITIAL must remain nonzero so we know this
9271 was an actual function definition. */
9272 DECL_INITIAL (current_function_decl
) = error_mark_node
;
9273 DECL_ARGUMENTS (current_function_decl
) = 0;
9276 c_stmt_tree
= p
->base
.x_stmt_tree
;
9277 p
->base
.x_stmt_tree
.x_cur_stmt_list
= NULL
;
9278 c_break_label
= p
->x_break_label
;
9279 c_cont_label
= p
->x_cont_label
;
9280 c_switch_stack
= p
->x_switch_stack
;
9281 current_function_arg_info
= p
->arg_info
;
9282 current_function_returns_value
= p
->returns_value
;
9283 current_function_returns_null
= p
->returns_null
;
9284 current_function_returns_abnormally
= p
->returns_abnormally
;
9285 warn_about_return_type
= p
->warn_about_return_type
;
9288 /* The functions below are required for functionality of doing
9289 function at once processing in the C front end. Currently these
9290 functions are not called from anywhere in the C front end, but as
9291 these changes continue, that will change. */
9293 /* Returns the stmt_tree (if any) to which statements are currently
9294 being added. If there is no active statement-tree, NULL is
9298 current_stmt_tree (void)
9300 return &c_stmt_tree
;
9303 /* Return the global value of T as a symbol. */
9306 identifier_global_value (tree t
)
9308 struct c_binding
*b
;
9310 for (b
= I_SYMBOL_BINDING (t
); b
; b
= b
->shadowed
)
9311 if (B_IN_FILE_SCOPE (b
) || B_IN_EXTERNAL_SCOPE (b
))
9317 /* In C, the only C-linkage public declaration is at file scope. */
9320 c_linkage_bindings (tree name
)
9322 return identifier_global_value (name
);
9325 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
9326 otherwise the name is found in ridpointers from RID_INDEX. */
9329 record_builtin_type (enum rid rid_index
, const char *name
, tree type
)
9333 id
= ridpointers
[(int) rid_index
];
9335 id
= get_identifier (name
);
9336 decl
= build_decl (UNKNOWN_LOCATION
, TYPE_DECL
, id
, type
);
9338 if (debug_hooks
->type_decl
)
9339 debug_hooks
->type_decl (decl
, false);
9342 /* Build the void_list_node (void_type_node having been created). */
9344 build_void_list_node (void)
9346 tree t
= build_tree_list (NULL_TREE
, void_type_node
);
9350 /* Return a c_parm structure with the given SPECS, ATTRS and DECLARATOR. */
9353 build_c_parm (struct c_declspecs
*specs
, tree attrs
,
9354 struct c_declarator
*declarator
)
9356 struct c_parm
*ret
= XOBNEW (&parser_obstack
, struct c_parm
);
9359 ret
->declarator
= declarator
;
9363 /* Return a declarator with nested attributes. TARGET is the inner
9364 declarator to which these attributes apply. ATTRS are the
9367 struct c_declarator
*
9368 build_attrs_declarator (tree attrs
, struct c_declarator
*target
)
9370 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
9371 ret
->kind
= cdk_attrs
;
9372 ret
->declarator
= target
;
9373 ret
->u
.attrs
= attrs
;
9377 /* Return a declarator for a function with arguments specified by ARGS
9378 and return type specified by TARGET. */
9380 struct c_declarator
*
9381 build_function_declarator (struct c_arg_info
*args
,
9382 struct c_declarator
*target
)
9384 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
9385 ret
->kind
= cdk_function
;
9386 ret
->declarator
= target
;
9387 ret
->u
.arg_info
= args
;
9391 /* Return a declarator for the identifier IDENT (which may be
9392 NULL_TREE for an abstract declarator). */
9394 struct c_declarator
*
9395 build_id_declarator (tree ident
)
9397 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
9399 ret
->declarator
= 0;
9401 /* Default value - may get reset to a more precise location. */
9402 ret
->id_loc
= input_location
;
9406 /* Return something to represent absolute declarators containing a *.
9407 TARGET is the absolute declarator that the * contains.
9408 TYPE_QUALS_ATTRS is a structure for type qualifiers and attributes
9409 to apply to the pointer type. */
9411 struct c_declarator
*
9412 make_pointer_declarator (struct c_declspecs
*type_quals_attrs
,
9413 struct c_declarator
*target
)
9417 struct c_declarator
*itarget
= target
;
9418 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
9419 if (type_quals_attrs
)
9421 attrs
= type_quals_attrs
->attrs
;
9422 quals
= quals_from_declspecs (type_quals_attrs
);
9423 if (attrs
!= NULL_TREE
)
9424 itarget
= build_attrs_declarator (attrs
, target
);
9426 ret
->kind
= cdk_pointer
;
9427 ret
->declarator
= itarget
;
9428 ret
->u
.pointer_quals
= quals
;
9432 /* Return a pointer to a structure for an empty list of declaration
9435 struct c_declspecs
*
9436 build_null_declspecs (void)
9438 struct c_declspecs
*ret
= XOBNEW (&parser_obstack
, struct c_declspecs
);
9439 memset (&ret
->locations
, 0, cdw_number_of_elements
);
9444 ret
->align_log
= -1;
9445 ret
->typespec_word
= cts_none
;
9446 ret
->storage_class
= csc_none
;
9447 ret
->expr_const_operands
= true;
9448 ret
->declspecs_seen_p
= false;
9449 ret
->typespec_kind
= ctsk_none
;
9450 ret
->non_sc_seen_p
= false;
9451 ret
->typedef_p
= false;
9452 ret
->explicit_signed_p
= false;
9453 ret
->deprecated_p
= false;
9454 ret
->default_int_p
= false;
9455 ret
->long_p
= false;
9456 ret
->long_long_p
= false;
9457 ret
->short_p
= false;
9458 ret
->signed_p
= false;
9459 ret
->unsigned_p
= false;
9460 ret
->complex_p
= false;
9461 ret
->inline_p
= false;
9462 ret
->noreturn_p
= false;
9463 ret
->thread_p
= false;
9464 ret
->thread_gnu_p
= false;
9465 ret
->const_p
= false;
9466 ret
->volatile_p
= false;
9467 ret
->atomic_p
= false;
9468 ret
->restrict_p
= false;
9469 ret
->saturating_p
= false;
9470 ret
->alignas_p
= false;
9471 ret
->address_space
= ADDR_SPACE_GENERIC
;
9475 /* Add the address space ADDRSPACE to the declaration specifiers
9476 SPECS, returning SPECS. */
9478 struct c_declspecs
*
9479 declspecs_add_addrspace (source_location location
,
9480 struct c_declspecs
*specs
, addr_space_t as
)
9482 specs
->non_sc_seen_p
= true;
9483 specs
->declspecs_seen_p
= true;
9485 if (!ADDR_SPACE_GENERIC_P (specs
->address_space
)
9486 && specs
->address_space
!= as
)
9487 error ("incompatible address space qualifiers %qs and %qs",
9488 c_addr_space_name (as
),
9489 c_addr_space_name (specs
->address_space
));
9492 specs
->address_space
= as
;
9493 specs
->locations
[cdw_address_space
] = location
;
9498 /* Add the type qualifier QUAL to the declaration specifiers SPECS,
9501 struct c_declspecs
*
9502 declspecs_add_qual (source_location loc
,
9503 struct c_declspecs
*specs
, tree qual
)
9507 specs
->non_sc_seen_p
= true;
9508 specs
->declspecs_seen_p
= true;
9509 gcc_assert (TREE_CODE (qual
) == IDENTIFIER_NODE
9510 && C_IS_RESERVED_WORD (qual
));
9511 i
= C_RID_CODE (qual
);
9515 dupe
= specs
->const_p
;
9516 specs
->const_p
= true;
9517 specs
->locations
[cdw_const
] = loc
;
9520 dupe
= specs
->volatile_p
;
9521 specs
->volatile_p
= true;
9522 specs
->locations
[cdw_volatile
] = loc
;
9525 dupe
= specs
->restrict_p
;
9526 specs
->restrict_p
= true;
9527 specs
->locations
[cdw_restrict
] = loc
;
9530 dupe
= specs
->atomic_p
;
9531 specs
->atomic_p
= true;
9537 pedwarn_c90 (loc
, OPT_Wpedantic
, "duplicate %qE", qual
);
9541 /* Add the type specifier TYPE to the declaration specifiers SPECS,
9544 struct c_declspecs
*
9545 declspecs_add_type (location_t loc
, struct c_declspecs
*specs
,
9546 struct c_typespec spec
)
9548 tree type
= spec
.spec
;
9549 specs
->non_sc_seen_p
= true;
9550 specs
->declspecs_seen_p
= true;
9551 specs
->typespec_kind
= spec
.kind
;
9552 if (TREE_DEPRECATED (type
))
9553 specs
->deprecated_p
= true;
9555 /* Handle type specifier keywords. */
9556 if (TREE_CODE (type
) == IDENTIFIER_NODE
9557 && C_IS_RESERVED_WORD (type
)
9558 && C_RID_CODE (type
) != RID_CXX_COMPAT_WARN
)
9560 enum rid i
= C_RID_CODE (type
);
9563 error_at (loc
, "two or more data types in declaration specifiers");
9566 if ((int) i
<= (int) RID_LAST_MODIFIER
)
9568 /* "long", "short", "signed", "unsigned", "_Complex" or "_Sat". */
9573 if (specs
->long_long_p
)
9575 error_at (loc
, "%<long long long%> is too long for GCC");
9580 if (specs
->typespec_word
== cts_double
)
9583 ("both %<long long%> and %<double%> in "
9584 "declaration specifiers"));
9587 pedwarn_c90 (loc
, OPT_Wlong_long
,
9588 "ISO C90 does not support %<long long%>");
9589 specs
->long_long_p
= 1;
9590 specs
->locations
[cdw_long_long
] = loc
;
9595 ("both %<long%> and %<short%> in "
9596 "declaration specifiers"));
9597 else if (specs
->typespec_word
== cts_auto_type
)
9599 ("both %<long%> and %<__auto_type%> in "
9600 "declaration specifiers"));
9601 else if (specs
->typespec_word
== cts_void
)
9603 ("both %<long%> and %<void%> in "
9604 "declaration specifiers"));
9605 else if (specs
->typespec_word
== cts_int_n
)
9607 ("both %<long%> and %<__int%d%> in "
9608 "declaration specifiers"),
9609 int_n_data
[specs
->int_n_idx
].bitsize
);
9610 else if (specs
->typespec_word
== cts_bool
)
9612 ("both %<long%> and %<_Bool%> in "
9613 "declaration specifiers"));
9614 else if (specs
->typespec_word
== cts_char
)
9616 ("both %<long%> and %<char%> in "
9617 "declaration specifiers"));
9618 else if (specs
->typespec_word
== cts_float
)
9620 ("both %<long%> and %<float%> in "
9621 "declaration specifiers"));
9622 else if (specs
->typespec_word
== cts_dfloat32
)
9624 ("both %<long%> and %<_Decimal32%> in "
9625 "declaration specifiers"));
9626 else if (specs
->typespec_word
== cts_dfloat64
)
9628 ("both %<long%> and %<_Decimal64%> in "
9629 "declaration specifiers"));
9630 else if (specs
->typespec_word
== cts_dfloat128
)
9632 ("both %<long%> and %<_Decimal128%> in "
9633 "declaration specifiers"));
9636 specs
->long_p
= true;
9637 specs
->locations
[cdw_long
] = loc
;
9641 dupe
= specs
->short_p
;
9644 ("both %<long%> and %<short%> in "
9645 "declaration specifiers"));
9646 else if (specs
->typespec_word
== cts_auto_type
)
9648 ("both %<short%> and %<__auto_type%> in "
9649 "declaration specifiers"));
9650 else if (specs
->typespec_word
== cts_void
)
9652 ("both %<short%> and %<void%> in "
9653 "declaration specifiers"));
9654 else if (specs
->typespec_word
== cts_int_n
)
9656 ("both %<short%> and %<__int%d%> in "
9657 "declaration specifiers"),
9658 int_n_data
[specs
->int_n_idx
].bitsize
);
9659 else if (specs
->typespec_word
== cts_bool
)
9661 ("both %<short%> and %<_Bool%> in "
9662 "declaration specifiers"));
9663 else if (specs
->typespec_word
== cts_char
)
9665 ("both %<short%> and %<char%> in "
9666 "declaration specifiers"));
9667 else if (specs
->typespec_word
== cts_float
)
9669 ("both %<short%> and %<float%> in "
9670 "declaration specifiers"));
9671 else if (specs
->typespec_word
== cts_double
)
9673 ("both %<short%> and %<double%> in "
9674 "declaration specifiers"));
9675 else if (specs
->typespec_word
== cts_dfloat32
)
9677 ("both %<short%> and %<_Decimal32%> in "
9678 "declaration specifiers"));
9679 else if (specs
->typespec_word
== cts_dfloat64
)
9681 ("both %<short%> and %<_Decimal64%> in "
9682 "declaration specifiers"));
9683 else if (specs
->typespec_word
== cts_dfloat128
)
9685 ("both %<short%> and %<_Decimal128%> in "
9686 "declaration specifiers"));
9689 specs
->short_p
= true;
9690 specs
->locations
[cdw_short
] = loc
;
9694 dupe
= specs
->signed_p
;
9695 if (specs
->unsigned_p
)
9697 ("both %<signed%> and %<unsigned%> in "
9698 "declaration specifiers"));
9699 else if (specs
->typespec_word
== cts_auto_type
)
9701 ("both %<signed%> and %<__auto_type%> in "
9702 "declaration specifiers"));
9703 else if (specs
->typespec_word
== cts_void
)
9705 ("both %<signed%> and %<void%> in "
9706 "declaration specifiers"));
9707 else if (specs
->typespec_word
== cts_bool
)
9709 ("both %<signed%> and %<_Bool%> in "
9710 "declaration specifiers"));
9711 else if (specs
->typespec_word
== cts_float
)
9713 ("both %<signed%> and %<float%> in "
9714 "declaration specifiers"));
9715 else if (specs
->typespec_word
== cts_double
)
9717 ("both %<signed%> and %<double%> in "
9718 "declaration specifiers"));
9719 else if (specs
->typespec_word
== cts_dfloat32
)
9721 ("both %<signed%> and %<_Decimal32%> in "
9722 "declaration specifiers"));
9723 else if (specs
->typespec_word
== cts_dfloat64
)
9725 ("both %<signed%> and %<_Decimal64%> in "
9726 "declaration specifiers"));
9727 else if (specs
->typespec_word
== cts_dfloat128
)
9729 ("both %<signed%> and %<_Decimal128%> in "
9730 "declaration specifiers"));
9733 specs
->signed_p
= true;
9734 specs
->locations
[cdw_signed
] = loc
;
9738 dupe
= specs
->unsigned_p
;
9739 if (specs
->signed_p
)
9741 ("both %<signed%> and %<unsigned%> in "
9742 "declaration specifiers"));
9743 else if (specs
->typespec_word
== cts_auto_type
)
9745 ("both %<unsigned%> and %<__auto_type%> in "
9746 "declaration specifiers"));
9747 else if (specs
->typespec_word
== cts_void
)
9749 ("both %<unsigned%> and %<void%> in "
9750 "declaration specifiers"));
9751 else if (specs
->typespec_word
== cts_bool
)
9753 ("both %<unsigned%> and %<_Bool%> in "
9754 "declaration specifiers"));
9755 else if (specs
->typespec_word
== cts_float
)
9757 ("both %<unsigned%> and %<float%> in "
9758 "declaration specifiers"));
9759 else if (specs
->typespec_word
== cts_double
)
9761 ("both %<unsigned%> and %<double%> in "
9762 "declaration specifiers"));
9763 else if (specs
->typespec_word
== cts_dfloat32
)
9765 ("both %<unsigned%> and %<_Decimal32%> in "
9766 "declaration specifiers"));
9767 else if (specs
->typespec_word
== cts_dfloat64
)
9769 ("both %<unsigned%> and %<_Decimal64%> in "
9770 "declaration specifiers"));
9771 else if (specs
->typespec_word
== cts_dfloat128
)
9773 ("both %<unsigned%> and %<_Decimal128%> in "
9774 "declaration specifiers"));
9777 specs
->unsigned_p
= true;
9778 specs
->locations
[cdw_unsigned
] = loc
;
9782 dupe
= specs
->complex_p
;
9783 if (!in_system_header_at (loc
))
9784 pedwarn_c90 (loc
, OPT_Wpedantic
,
9785 "ISO C90 does not support complex types");
9786 if (specs
->typespec_word
== cts_auto_type
)
9788 ("both %<complex%> and %<__auto_type%> in "
9789 "declaration specifiers"));
9790 else if (specs
->typespec_word
== cts_void
)
9792 ("both %<complex%> and %<void%> in "
9793 "declaration specifiers"));
9794 else if (specs
->typespec_word
== cts_bool
)
9796 ("both %<complex%> and %<_Bool%> in "
9797 "declaration specifiers"));
9798 else if (specs
->typespec_word
== cts_dfloat32
)
9800 ("both %<complex%> and %<_Decimal32%> in "
9801 "declaration specifiers"));
9802 else if (specs
->typespec_word
== cts_dfloat64
)
9804 ("both %<complex%> and %<_Decimal64%> in "
9805 "declaration specifiers"));
9806 else if (specs
->typespec_word
== cts_dfloat128
)
9808 ("both %<complex%> and %<_Decimal128%> in "
9809 "declaration specifiers"));
9810 else if (specs
->typespec_word
== cts_fract
)
9812 ("both %<complex%> and %<_Fract%> in "
9813 "declaration specifiers"));
9814 else if (specs
->typespec_word
== cts_accum
)
9816 ("both %<complex%> and %<_Accum%> in "
9817 "declaration specifiers"));
9818 else if (specs
->saturating_p
)
9820 ("both %<complex%> and %<_Sat%> in "
9821 "declaration specifiers"));
9824 specs
->complex_p
= true;
9825 specs
->locations
[cdw_complex
] = loc
;
9829 dupe
= specs
->saturating_p
;
9830 pedwarn (loc
, OPT_Wpedantic
,
9831 "ISO C does not support saturating types");
9832 if (specs
->typespec_word
== cts_int_n
)
9835 ("both %<_Sat%> and %<__int%d%> in "
9836 "declaration specifiers"),
9837 int_n_data
[specs
->int_n_idx
].bitsize
);
9839 else if (specs
->typespec_word
== cts_auto_type
)
9841 ("both %<_Sat%> and %<__auto_type%> in "
9842 "declaration specifiers"));
9843 else if (specs
->typespec_word
== cts_void
)
9845 ("both %<_Sat%> and %<void%> in "
9846 "declaration specifiers"));
9847 else if (specs
->typespec_word
== cts_bool
)
9849 ("both %<_Sat%> and %<_Bool%> in "
9850 "declaration specifiers"));
9851 else if (specs
->typespec_word
== cts_char
)
9853 ("both %<_Sat%> and %<char%> in "
9854 "declaration specifiers"));
9855 else if (specs
->typespec_word
== cts_int
)
9857 ("both %<_Sat%> and %<int%> in "
9858 "declaration specifiers"));
9859 else if (specs
->typespec_word
== cts_float
)
9861 ("both %<_Sat%> and %<float%> in "
9862 "declaration specifiers"));
9863 else if (specs
->typespec_word
== cts_double
)
9865 ("both %<_Sat%> and %<double%> in "
9866 "declaration specifiers"));
9867 else if (specs
->typespec_word
== cts_dfloat32
)
9869 ("both %<_Sat%> and %<_Decimal32%> in "
9870 "declaration specifiers"));
9871 else if (specs
->typespec_word
== cts_dfloat64
)
9873 ("both %<_Sat%> and %<_Decimal64%> in "
9874 "declaration specifiers"));
9875 else if (specs
->typespec_word
== cts_dfloat128
)
9877 ("both %<_Sat%> and %<_Decimal128%> in "
9878 "declaration specifiers"));
9879 else if (specs
->complex_p
)
9881 ("both %<_Sat%> and %<complex%> in "
9882 "declaration specifiers"));
9885 specs
->saturating_p
= true;
9886 specs
->locations
[cdw_saturating
] = loc
;
9894 error_at (loc
, "duplicate %qE", type
);
9900 /* "void", "_Bool", "char", "int", "float", "double", "_Decimal32",
9901 "__intN", "_Decimal64", "_Decimal128", "_Fract", "_Accum" or
9903 if (specs
->typespec_word
!= cts_none
)
9906 "two or more data types in declaration specifiers");
9914 ("both %<long%> and %<__auto_type%> in "
9915 "declaration specifiers"));
9916 else if (specs
->short_p
)
9918 ("both %<short%> and %<__auto_type%> in "
9919 "declaration specifiers"));
9920 else if (specs
->signed_p
)
9922 ("both %<signed%> and %<__auto_type%> in "
9923 "declaration specifiers"));
9924 else if (specs
->unsigned_p
)
9926 ("both %<unsigned%> and %<__auto_type%> in "
9927 "declaration specifiers"));
9928 else if (specs
->complex_p
)
9930 ("both %<complex%> and %<__auto_type%> in "
9931 "declaration specifiers"));
9932 else if (specs
->saturating_p
)
9934 ("both %<_Sat%> and %<__auto_type%> in "
9935 "declaration specifiers"));
9938 specs
->typespec_word
= cts_auto_type
;
9939 specs
->locations
[cdw_typespec
] = loc
;
9946 specs
->int_n_idx
= i
- RID_INT_N_0
;
9947 if (!in_system_header_at (input_location
))
9948 pedwarn (loc
, OPT_Wpedantic
,
9949 "ISO C does not support %<__int%d%> types",
9950 int_n_data
[specs
->int_n_idx
].bitsize
);
9954 ("both %<__int%d%> and %<long%> in "
9955 "declaration specifiers"),
9956 int_n_data
[specs
->int_n_idx
].bitsize
);
9957 else if (specs
->saturating_p
)
9959 ("both %<_Sat%> and %<__int%d%> in "
9960 "declaration specifiers"),
9961 int_n_data
[specs
->int_n_idx
].bitsize
);
9962 else if (specs
->short_p
)
9964 ("both %<__int%d%> and %<short%> in "
9965 "declaration specifiers"),
9966 int_n_data
[specs
->int_n_idx
].bitsize
);
9967 else if (! int_n_enabled_p
[specs
->int_n_idx
])
9969 "%<__int%d%> is not supported on this target",
9970 int_n_data
[specs
->int_n_idx
].bitsize
);
9973 specs
->typespec_word
= cts_int_n
;
9974 specs
->locations
[cdw_typespec
] = loc
;
9980 ("both %<long%> and %<void%> in "
9981 "declaration specifiers"));
9982 else if (specs
->short_p
)
9984 ("both %<short%> and %<void%> in "
9985 "declaration specifiers"));
9986 else if (specs
->signed_p
)
9988 ("both %<signed%> and %<void%> in "
9989 "declaration specifiers"));
9990 else if (specs
->unsigned_p
)
9992 ("both %<unsigned%> and %<void%> in "
9993 "declaration specifiers"));
9994 else if (specs
->complex_p
)
9996 ("both %<complex%> and %<void%> in "
9997 "declaration specifiers"));
9998 else if (specs
->saturating_p
)
10000 ("both %<_Sat%> and %<void%> in "
10001 "declaration specifiers"));
10004 specs
->typespec_word
= cts_void
;
10005 specs
->locations
[cdw_typespec
] = loc
;
10009 if (!in_system_header_at (loc
))
10010 pedwarn_c90 (loc
, OPT_Wpedantic
,
10011 "ISO C90 does not support boolean types");
10014 ("both %<long%> and %<_Bool%> in "
10015 "declaration specifiers"));
10016 else if (specs
->short_p
)
10018 ("both %<short%> and %<_Bool%> in "
10019 "declaration specifiers"));
10020 else if (specs
->signed_p
)
10022 ("both %<signed%> and %<_Bool%> in "
10023 "declaration specifiers"));
10024 else if (specs
->unsigned_p
)
10026 ("both %<unsigned%> and %<_Bool%> in "
10027 "declaration specifiers"));
10028 else if (specs
->complex_p
)
10030 ("both %<complex%> and %<_Bool%> in "
10031 "declaration specifiers"));
10032 else if (specs
->saturating_p
)
10034 ("both %<_Sat%> and %<_Bool%> in "
10035 "declaration specifiers"));
10038 specs
->typespec_word
= cts_bool
;
10039 specs
->locations
[cdw_typespec
] = loc
;
10045 ("both %<long%> and %<char%> in "
10046 "declaration specifiers"));
10047 else if (specs
->short_p
)
10049 ("both %<short%> and %<char%> in "
10050 "declaration specifiers"));
10051 else if (specs
->saturating_p
)
10053 ("both %<_Sat%> and %<char%> in "
10054 "declaration specifiers"));
10057 specs
->typespec_word
= cts_char
;
10058 specs
->locations
[cdw_typespec
] = loc
;
10062 if (specs
->saturating_p
)
10064 ("both %<_Sat%> and %<int%> in "
10065 "declaration specifiers"));
10068 specs
->typespec_word
= cts_int
;
10069 specs
->locations
[cdw_typespec
] = loc
;
10075 ("both %<long%> and %<float%> in "
10076 "declaration specifiers"));
10077 else if (specs
->short_p
)
10079 ("both %<short%> and %<float%> in "
10080 "declaration specifiers"));
10081 else if (specs
->signed_p
)
10083 ("both %<signed%> and %<float%> in "
10084 "declaration specifiers"));
10085 else if (specs
->unsigned_p
)
10087 ("both %<unsigned%> and %<float%> in "
10088 "declaration specifiers"));
10089 else if (specs
->saturating_p
)
10091 ("both %<_Sat%> and %<float%> in "
10092 "declaration specifiers"));
10095 specs
->typespec_word
= cts_float
;
10096 specs
->locations
[cdw_typespec
] = loc
;
10100 if (specs
->long_long_p
)
10102 ("both %<long long%> and %<double%> in "
10103 "declaration specifiers"));
10104 else if (specs
->short_p
)
10106 ("both %<short%> and %<double%> in "
10107 "declaration specifiers"));
10108 else if (specs
->signed_p
)
10110 ("both %<signed%> and %<double%> in "
10111 "declaration specifiers"));
10112 else if (specs
->unsigned_p
)
10114 ("both %<unsigned%> and %<double%> in "
10115 "declaration specifiers"));
10116 else if (specs
->saturating_p
)
10118 ("both %<_Sat%> and %<double%> in "
10119 "declaration specifiers"));
10122 specs
->typespec_word
= cts_double
;
10123 specs
->locations
[cdw_typespec
] = loc
;
10128 case RID_DFLOAT128
:
10131 if (i
== RID_DFLOAT32
)
10132 str
= "_Decimal32";
10133 else if (i
== RID_DFLOAT64
)
10134 str
= "_Decimal64";
10136 str
= "_Decimal128";
10137 if (specs
->long_long_p
)
10139 ("both %<long long%> and %<%s%> in "
10140 "declaration specifiers"),
10144 ("both %<long%> and %<%s%> in "
10145 "declaration specifiers"),
10147 else if (specs
->short_p
)
10149 ("both %<short%> and %<%s%> in "
10150 "declaration specifiers"),
10152 else if (specs
->signed_p
)
10154 ("both %<signed%> and %<%s%> in "
10155 "declaration specifiers"),
10157 else if (specs
->unsigned_p
)
10159 ("both %<unsigned%> and %<%s%> in "
10160 "declaration specifiers"),
10162 else if (specs
->complex_p
)
10164 ("both %<complex%> and %<%s%> in "
10165 "declaration specifiers"),
10167 else if (specs
->saturating_p
)
10169 ("both %<_Sat%> and %<%s%> in "
10170 "declaration specifiers"),
10172 else if (i
== RID_DFLOAT32
)
10173 specs
->typespec_word
= cts_dfloat32
;
10174 else if (i
== RID_DFLOAT64
)
10175 specs
->typespec_word
= cts_dfloat64
;
10177 specs
->typespec_word
= cts_dfloat128
;
10178 specs
->locations
[cdw_typespec
] = loc
;
10180 if (!targetm
.decimal_float_supported_p ())
10182 ("decimal floating point not supported "
10183 "for this target"));
10184 pedwarn (loc
, OPT_Wpedantic
,
10185 "ISO C does not support decimal floating point");
10191 if (i
== RID_FRACT
)
10195 if (specs
->complex_p
)
10197 ("both %<complex%> and %<%s%> in "
10198 "declaration specifiers"),
10200 else if (i
== RID_FRACT
)
10201 specs
->typespec_word
= cts_fract
;
10203 specs
->typespec_word
= cts_accum
;
10204 specs
->locations
[cdw_typespec
] = loc
;
10206 if (!targetm
.fixed_point_supported_p ())
10208 "fixed-point types not supported for this target");
10209 pedwarn (loc
, OPT_Wpedantic
,
10210 "ISO C does not support fixed-point types");
10213 /* ObjC reserved word "id", handled below. */
10219 /* Now we have a typedef (a TYPE_DECL node), an identifier (some
10220 form of ObjC type, cases such as "int" and "long" being handled
10221 above), a TYPE (struct, union, enum and typeof specifiers) or an
10222 ERROR_MARK. In none of these cases may there have previously
10223 been any type specifiers. */
10224 if (specs
->type
|| specs
->typespec_word
!= cts_none
10225 || specs
->long_p
|| specs
->short_p
|| specs
->signed_p
10226 || specs
->unsigned_p
|| specs
->complex_p
)
10227 error_at (loc
, "two or more data types in declaration specifiers");
10228 else if (TREE_CODE (type
) == TYPE_DECL
)
10230 if (TREE_TYPE (type
) == error_mark_node
)
10231 ; /* Allow the type to default to int to avoid cascading errors. */
10234 specs
->type
= TREE_TYPE (type
);
10235 specs
->decl_attr
= DECL_ATTRIBUTES (type
);
10236 specs
->typedef_p
= true;
10237 specs
->explicit_signed_p
= C_TYPEDEF_EXPLICITLY_SIGNED (type
);
10238 specs
->locations
[cdw_typedef
] = loc
;
10240 /* If this typedef name is defined in a struct, then a C++
10241 lookup would return a different value. */
10242 if (warn_cxx_compat
10243 && I_SYMBOL_BINDING (DECL_NAME (type
))->in_struct
)
10244 warning_at (loc
, OPT_Wc___compat
,
10245 "C++ lookup of %qD would return a field, not a type",
10248 /* If we are parsing a struct, record that a struct field
10250 if (warn_cxx_compat
&& struct_parse_info
!= NULL
)
10251 struct_parse_info
->typedefs_seen
.safe_push (type
);
10254 else if (TREE_CODE (type
) == IDENTIFIER_NODE
)
10256 tree t
= lookup_name (type
);
10257 if (!t
|| TREE_CODE (t
) != TYPE_DECL
)
10258 error_at (loc
, "%qE fails to be a typedef or built in type", type
);
10259 else if (TREE_TYPE (t
) == error_mark_node
)
10263 specs
->type
= TREE_TYPE (t
);
10264 specs
->locations
[cdw_typespec
] = loc
;
10269 if (TREE_CODE (type
) != ERROR_MARK
&& spec
.kind
== ctsk_typeof
)
10271 specs
->typedef_p
= true;
10272 specs
->locations
[cdw_typedef
] = loc
;
10276 specs
->expr
= build2 (COMPOUND_EXPR
, TREE_TYPE (spec
.expr
),
10277 specs
->expr
, spec
.expr
);
10279 specs
->expr
= spec
.expr
;
10280 specs
->expr_const_operands
&= spec
.expr_const_operands
;
10283 specs
->type
= type
;
10289 /* Add the storage class specifier or function specifier SCSPEC to the
10290 declaration specifiers SPECS, returning SPECS. */
10292 struct c_declspecs
*
10293 declspecs_add_scspec (source_location loc
,
10294 struct c_declspecs
*specs
,
10298 enum c_storage_class n
= csc_none
;
10300 specs
->declspecs_seen_p
= true;
10301 gcc_assert (TREE_CODE (scspec
) == IDENTIFIER_NODE
10302 && C_IS_RESERVED_WORD (scspec
));
10303 i
= C_RID_CODE (scspec
);
10304 if (specs
->non_sc_seen_p
)
10305 warning (OPT_Wold_style_declaration
,
10306 "%qE is not at beginning of declaration", scspec
);
10310 /* C99 permits duplicate inline. Although of doubtful utility,
10311 it seems simplest to permit it in gnu89 mode as well, as
10312 there is also little utility in maintaining this as a
10313 difference between gnu89 and C99 inline. */
10315 specs
->inline_p
= true;
10316 specs
->locations
[cdw_inline
] = loc
;
10319 /* Duplicate _Noreturn is permitted. */
10321 specs
->noreturn_p
= true;
10322 specs
->locations
[cdw_noreturn
] = loc
;
10325 dupe
= specs
->thread_p
;
10326 if (specs
->storage_class
== csc_auto
)
10327 error ("%qE used with %<auto%>", scspec
);
10328 else if (specs
->storage_class
== csc_register
)
10329 error ("%qE used with %<register%>", scspec
);
10330 else if (specs
->storage_class
== csc_typedef
)
10331 error ("%qE used with %<typedef%>", scspec
);
10334 specs
->thread_p
= true;
10335 specs
->thread_gnu_p
= (strcmp (IDENTIFIER_POINTER (scspec
),
10337 /* A diagnostic is not required for the use of this
10338 identifier in the implementation namespace; only diagnose
10339 it for the C11 spelling because of existing code using
10340 the other spelling. */
10341 if (!specs
->thread_gnu_p
)
10344 pedwarn_c99 (loc
, OPT_Wpedantic
,
10345 "ISO C99 does not support %qE", scspec
);
10347 pedwarn_c99 (loc
, OPT_Wpedantic
,
10348 "ISO C90 does not support %qE", scspec
);
10350 specs
->locations
[cdw_thread
] = loc
;
10358 /* Diagnose "__thread extern". */
10359 if (specs
->thread_p
&& specs
->thread_gnu_p
)
10360 error ("%<__thread%> before %<extern%>");
10367 /* Diagnose "__thread static". */
10368 if (specs
->thread_p
&& specs
->thread_gnu_p
)
10369 error ("%<__thread%> before %<static%>");
10375 gcc_unreachable ();
10377 if (n
!= csc_none
&& n
== specs
->storage_class
)
10381 if (i
== RID_THREAD
)
10382 error ("duplicate %<_Thread_local%> or %<__thread%>");
10384 error ("duplicate %qE", scspec
);
10388 if (specs
->storage_class
!= csc_none
&& n
!= specs
->storage_class
)
10390 error ("multiple storage classes in declaration specifiers");
10394 specs
->storage_class
= n
;
10395 specs
->locations
[cdw_storage_class
] = loc
;
10396 if (n
!= csc_extern
&& n
!= csc_static
&& specs
->thread_p
)
10398 error ("%qs used with %qE",
10399 specs
->thread_gnu_p
? "__thread" : "_Thread_local",
10401 specs
->thread_p
= false;
10408 /* Add the attributes ATTRS to the declaration specifiers SPECS,
10409 returning SPECS. */
10411 struct c_declspecs
*
10412 declspecs_add_attrs (source_location loc
, struct c_declspecs
*specs
, tree attrs
)
10414 specs
->attrs
= chainon (attrs
, specs
->attrs
);
10415 specs
->locations
[cdw_attributes
] = loc
;
10416 specs
->declspecs_seen_p
= true;
10420 /* Add an _Alignas specifier (expression ALIGN, or type whose
10421 alignment is ALIGN) to the declaration specifiers SPECS, returning
10423 struct c_declspecs
*
10424 declspecs_add_alignas (source_location loc
,
10425 struct c_declspecs
*specs
, tree align
)
10428 specs
->alignas_p
= true;
10429 specs
->locations
[cdw_alignas
] = loc
;
10430 if (align
== error_mark_node
)
10432 align_log
= check_user_alignment (align
, true);
10433 if (align_log
> specs
->align_log
)
10434 specs
->align_log
= align_log
;
10438 /* Combine "long", "short", "signed", "unsigned" and "_Complex" type
10439 specifiers with any other type specifier to determine the resulting
10440 type. This is where ISO C checks on complex types are made, since
10441 "_Complex long" is a prefix of the valid ISO C type "_Complex long
10444 struct c_declspecs
*
10445 finish_declspecs (struct c_declspecs
*specs
)
10447 /* If a type was specified as a whole, we have no modifiers and are
10449 if (specs
->type
!= NULL_TREE
)
10451 gcc_assert (!specs
->long_p
&& !specs
->long_long_p
&& !specs
->short_p
10452 && !specs
->signed_p
&& !specs
->unsigned_p
10453 && !specs
->complex_p
);
10455 /* Set a dummy type. */
10456 if (TREE_CODE (specs
->type
) == ERROR_MARK
)
10457 specs
->type
= integer_type_node
;
10461 /* If none of "void", "_Bool", "char", "int", "float" or "double"
10462 has been specified, treat it as "int" unless "_Complex" is
10463 present and there are no other specifiers. If we just have
10464 "_Complex", it is equivalent to "_Complex double", but e.g.
10465 "_Complex short" is equivalent to "_Complex short int". */
10466 if (specs
->typespec_word
== cts_none
)
10468 if (specs
->saturating_p
)
10470 error_at (specs
->locations
[cdw_saturating
],
10471 "%<_Sat%> is used without %<_Fract%> or %<_Accum%>");
10472 if (!targetm
.fixed_point_supported_p ())
10473 error_at (specs
->locations
[cdw_saturating
],
10474 "fixed-point types not supported for this target");
10475 specs
->typespec_word
= cts_fract
;
10477 else if (specs
->long_p
|| specs
->short_p
10478 || specs
->signed_p
|| specs
->unsigned_p
)
10480 specs
->typespec_word
= cts_int
;
10482 else if (specs
->complex_p
)
10484 specs
->typespec_word
= cts_double
;
10485 pedwarn (specs
->locations
[cdw_complex
], OPT_Wpedantic
,
10486 "ISO C does not support plain %<complex%> meaning "
10487 "%<double complex%>");
10491 specs
->typespec_word
= cts_int
;
10492 specs
->default_int_p
= true;
10493 /* We don't diagnose this here because grokdeclarator will
10494 give more specific diagnostics according to whether it is
10495 a function definition. */
10499 /* If "signed" was specified, record this to distinguish "int" and
10500 "signed int" in the case of a bit-field with
10501 -funsigned-bitfields. */
10502 specs
->explicit_signed_p
= specs
->signed_p
;
10504 /* Now compute the actual type. */
10505 switch (specs
->typespec_word
)
10507 case cts_auto_type
:
10508 gcc_assert (!specs
->long_p
&& !specs
->short_p
10509 && !specs
->signed_p
&& !specs
->unsigned_p
10510 && !specs
->complex_p
);
10511 /* Type to be filled in later. */
10514 gcc_assert (!specs
->long_p
&& !specs
->short_p
10515 && !specs
->signed_p
&& !specs
->unsigned_p
10516 && !specs
->complex_p
);
10517 specs
->type
= void_type_node
;
10520 gcc_assert (!specs
->long_p
&& !specs
->short_p
10521 && !specs
->signed_p
&& !specs
->unsigned_p
10522 && !specs
->complex_p
);
10523 specs
->type
= boolean_type_node
;
10526 gcc_assert (!specs
->long_p
&& !specs
->short_p
);
10527 gcc_assert (!(specs
->signed_p
&& specs
->unsigned_p
));
10528 if (specs
->signed_p
)
10529 specs
->type
= signed_char_type_node
;
10530 else if (specs
->unsigned_p
)
10531 specs
->type
= unsigned_char_type_node
;
10533 specs
->type
= char_type_node
;
10534 if (specs
->complex_p
)
10536 pedwarn (specs
->locations
[cdw_complex
], OPT_Wpedantic
,
10537 "ISO C does not support complex integer types");
10538 specs
->type
= build_complex_type (specs
->type
);
10542 gcc_assert (!specs
->long_p
&& !specs
->short_p
&& !specs
->long_long_p
);
10543 gcc_assert (!(specs
->signed_p
&& specs
->unsigned_p
));
10544 specs
->type
= (specs
->unsigned_p
10545 ? int_n_trees
[specs
->int_n_idx
].unsigned_type
10546 : int_n_trees
[specs
->int_n_idx
].signed_type
);
10547 if (specs
->complex_p
)
10549 pedwarn (specs
->locations
[cdw_complex
], OPT_Wpedantic
,
10550 "ISO C does not support complex integer types");
10551 specs
->type
= build_complex_type (specs
->type
);
10555 gcc_assert (!(specs
->long_p
&& specs
->short_p
));
10556 gcc_assert (!(specs
->signed_p
&& specs
->unsigned_p
));
10557 if (specs
->long_long_p
)
10558 specs
->type
= (specs
->unsigned_p
10559 ? long_long_unsigned_type_node
10560 : long_long_integer_type_node
);
10561 else if (specs
->long_p
)
10562 specs
->type
= (specs
->unsigned_p
10563 ? long_unsigned_type_node
10564 : long_integer_type_node
);
10565 else if (specs
->short_p
)
10566 specs
->type
= (specs
->unsigned_p
10567 ? short_unsigned_type_node
10568 : short_integer_type_node
);
10570 specs
->type
= (specs
->unsigned_p
10571 ? unsigned_type_node
10572 : integer_type_node
);
10573 if (specs
->complex_p
)
10575 pedwarn (specs
->locations
[cdw_complex
], OPT_Wpedantic
,
10576 "ISO C does not support complex integer types");
10577 specs
->type
= build_complex_type (specs
->type
);
10581 gcc_assert (!specs
->long_p
&& !specs
->short_p
10582 && !specs
->signed_p
&& !specs
->unsigned_p
);
10583 specs
->type
= (specs
->complex_p
10584 ? complex_float_type_node
10585 : float_type_node
);
10588 gcc_assert (!specs
->long_long_p
&& !specs
->short_p
10589 && !specs
->signed_p
&& !specs
->unsigned_p
);
10592 specs
->type
= (specs
->complex_p
10593 ? complex_long_double_type_node
10594 : long_double_type_node
);
10598 specs
->type
= (specs
->complex_p
10599 ? complex_double_type_node
10600 : double_type_node
);
10605 case cts_dfloat128
:
10606 gcc_assert (!specs
->long_p
&& !specs
->long_long_p
&& !specs
->short_p
10607 && !specs
->signed_p
&& !specs
->unsigned_p
&& !specs
->complex_p
);
10608 if (specs
->typespec_word
== cts_dfloat32
)
10609 specs
->type
= dfloat32_type_node
;
10610 else if (specs
->typespec_word
== cts_dfloat64
)
10611 specs
->type
= dfloat64_type_node
;
10613 specs
->type
= dfloat128_type_node
;
10616 gcc_assert (!specs
->complex_p
);
10617 if (!targetm
.fixed_point_supported_p ())
10618 specs
->type
= integer_type_node
;
10619 else if (specs
->saturating_p
)
10621 if (specs
->long_long_p
)
10622 specs
->type
= specs
->unsigned_p
10623 ? sat_unsigned_long_long_fract_type_node
10624 : sat_long_long_fract_type_node
;
10625 else if (specs
->long_p
)
10626 specs
->type
= specs
->unsigned_p
10627 ? sat_unsigned_long_fract_type_node
10628 : sat_long_fract_type_node
;
10629 else if (specs
->short_p
)
10630 specs
->type
= specs
->unsigned_p
10631 ? sat_unsigned_short_fract_type_node
10632 : sat_short_fract_type_node
;
10634 specs
->type
= specs
->unsigned_p
10635 ? sat_unsigned_fract_type_node
10636 : sat_fract_type_node
;
10640 if (specs
->long_long_p
)
10641 specs
->type
= specs
->unsigned_p
10642 ? unsigned_long_long_fract_type_node
10643 : long_long_fract_type_node
;
10644 else if (specs
->long_p
)
10645 specs
->type
= specs
->unsigned_p
10646 ? unsigned_long_fract_type_node
10647 : long_fract_type_node
;
10648 else if (specs
->short_p
)
10649 specs
->type
= specs
->unsigned_p
10650 ? unsigned_short_fract_type_node
10651 : short_fract_type_node
;
10653 specs
->type
= specs
->unsigned_p
10654 ? unsigned_fract_type_node
10659 gcc_assert (!specs
->complex_p
);
10660 if (!targetm
.fixed_point_supported_p ())
10661 specs
->type
= integer_type_node
;
10662 else if (specs
->saturating_p
)
10664 if (specs
->long_long_p
)
10665 specs
->type
= specs
->unsigned_p
10666 ? sat_unsigned_long_long_accum_type_node
10667 : sat_long_long_accum_type_node
;
10668 else if (specs
->long_p
)
10669 specs
->type
= specs
->unsigned_p
10670 ? sat_unsigned_long_accum_type_node
10671 : sat_long_accum_type_node
;
10672 else if (specs
->short_p
)
10673 specs
->type
= specs
->unsigned_p
10674 ? sat_unsigned_short_accum_type_node
10675 : sat_short_accum_type_node
;
10677 specs
->type
= specs
->unsigned_p
10678 ? sat_unsigned_accum_type_node
10679 : sat_accum_type_node
;
10683 if (specs
->long_long_p
)
10684 specs
->type
= specs
->unsigned_p
10685 ? unsigned_long_long_accum_type_node
10686 : long_long_accum_type_node
;
10687 else if (specs
->long_p
)
10688 specs
->type
= specs
->unsigned_p
10689 ? unsigned_long_accum_type_node
10690 : long_accum_type_node
;
10691 else if (specs
->short_p
)
10692 specs
->type
= specs
->unsigned_p
10693 ? unsigned_short_accum_type_node
10694 : short_accum_type_node
;
10696 specs
->type
= specs
->unsigned_p
10697 ? unsigned_accum_type_node
10702 gcc_unreachable ();
10708 /* Perform final processing on one file scope's declarations (or the
10709 external scope's declarations), GLOBALS. */
10712 c_write_global_declarations_1 (tree globals
)
10717 /* Process the decls in the order they were written. */
10718 for (decl
= globals
; decl
; decl
= DECL_CHAIN (decl
))
10720 /* Check for used but undefined static functions using the C
10721 standard's definition of "used", and set TREE_NO_WARNING so
10722 that check_global_declaration doesn't repeat the check. */
10723 if (TREE_CODE (decl
) == FUNCTION_DECL
10724 && DECL_INITIAL (decl
) == 0
10725 && DECL_EXTERNAL (decl
)
10726 && !TREE_PUBLIC (decl
)
10727 && C_DECL_USED (decl
))
10729 pedwarn (input_location
, 0, "%q+F used but never defined", decl
);
10730 TREE_NO_WARNING (decl
) = 1;
10733 wrapup_global_declaration_1 (decl
);
10738 reconsider
= false;
10739 for (decl
= globals
; decl
; decl
= DECL_CHAIN (decl
))
10740 reconsider
|= wrapup_global_declaration_2 (decl
);
10742 while (reconsider
);
10745 /* Callback to collect a source_ref from a DECL. */
10748 collect_source_ref_cb (tree decl
)
10750 if (!DECL_IS_BUILTIN (decl
))
10751 collect_source_ref (LOCATION_FILE (decl_sloc (decl
, false)));
10754 /* Preserve the external declarations scope across a garbage collect. */
10755 static GTY(()) tree ext_block
;
10757 /* Collect all references relevant to SOURCE_FILE. */
10760 collect_all_refs (const char *source_file
)
10765 FOR_EACH_VEC_ELT (*all_translation_units
, i
, t
)
10766 collect_ada_nodes (BLOCK_VARS (DECL_INITIAL (t
)), source_file
);
10768 collect_ada_nodes (BLOCK_VARS (ext_block
), source_file
);
10771 /* Iterate over all global declarations and call CALLBACK. */
10774 for_each_global_decl (void (*callback
) (tree decl
))
10781 FOR_EACH_VEC_ELT (*all_translation_units
, i
, t
)
10783 decls
= DECL_INITIAL (t
);
10784 for (decl
= BLOCK_VARS (decls
); decl
; decl
= TREE_CHAIN (decl
))
10788 for (decl
= BLOCK_VARS (ext_block
); decl
; decl
= TREE_CHAIN (decl
))
10792 /* Perform any final parser cleanups and generate initial debugging
10796 c_parse_final_cleanups (void)
10801 /* We don't want to do this if generating a PCH. */
10805 timevar_stop (TV_PHASE_PARSING
);
10806 timevar_start (TV_PHASE_DEFERRED
);
10808 /* Do the Objective-C stuff. This is where all the Objective-C
10809 module stuff gets generated (symtab, class/protocol/selector
10811 if (c_dialect_objc ())
10812 objc_write_global_declarations ();
10814 /* Close the external scope. */
10815 ext_block
= pop_scope ();
10816 external_scope
= 0;
10817 gcc_assert (!current_scope
);
10819 /* Handle -fdump-ada-spec[-slim]. */
10820 if (flag_dump_ada_spec
|| flag_dump_ada_spec_slim
)
10822 /* Build a table of files to generate specs for */
10823 if (flag_dump_ada_spec_slim
)
10824 collect_source_ref (main_input_filename
);
10826 for_each_global_decl (collect_source_ref_cb
);
10828 dump_ada_specs (collect_all_refs
, NULL
);
10833 tree tmp
= BLOCK_VARS (ext_block
);
10835 FILE * stream
= dump_begin (TDI_tu
, &flags
);
10838 dump_node (tmp
, flags
& ~TDF_SLIM
, stream
);
10839 dump_end (TDI_tu
, stream
);
10843 /* Process all file scopes in this compilation, and the external_scope,
10844 through wrapup_global_declarations. */
10845 FOR_EACH_VEC_ELT (*all_translation_units
, i
, t
)
10846 c_write_global_declarations_1 (BLOCK_VARS (DECL_INITIAL (t
)));
10847 c_write_global_declarations_1 (BLOCK_VARS (ext_block
));
10849 timevar_stop (TV_PHASE_DEFERRED
);
10850 timevar_start (TV_PHASE_PARSING
);
10855 /* Register reserved keyword WORD as qualifier for address space AS. */
10858 c_register_addr_space (const char *word
, addr_space_t as
)
10860 int rid
= RID_FIRST_ADDR_SPACE
+ as
;
10863 /* Address space qualifiers are only supported
10864 in C with GNU extensions enabled. */
10865 if (c_dialect_objc () || flag_no_asm
)
10868 id
= get_identifier (word
);
10869 C_SET_RID_CODE (id
, rid
);
10870 C_IS_RESERVED_WORD (id
) = 1;
10871 ridpointers
[rid
] = id
;
10874 /* Return identifier to look up for omp declare reduction. */
10877 c_omp_reduction_id (enum tree_code reduction_code
, tree reduction_id
)
10879 const char *p
= NULL
;
10880 switch (reduction_code
)
10882 case PLUS_EXPR
: p
= "+"; break;
10883 case MULT_EXPR
: p
= "*"; break;
10884 case MINUS_EXPR
: p
= "-"; break;
10885 case BIT_AND_EXPR
: p
= "&"; break;
10886 case BIT_XOR_EXPR
: p
= "^"; break;
10887 case BIT_IOR_EXPR
: p
= "|"; break;
10888 case TRUTH_ANDIF_EXPR
: p
= "&&"; break;
10889 case TRUTH_ORIF_EXPR
: p
= "||"; break;
10890 case MIN_EXPR
: p
= "min"; break;
10891 case MAX_EXPR
: p
= "max"; break;
10898 if (TREE_CODE (reduction_id
) != IDENTIFIER_NODE
)
10899 return error_mark_node
;
10900 p
= IDENTIFIER_POINTER (reduction_id
);
10903 const char prefix
[] = "omp declare reduction ";
10904 size_t lenp
= sizeof (prefix
);
10905 size_t len
= strlen (p
);
10906 char *name
= XALLOCAVEC (char, lenp
+ len
);
10907 memcpy (name
, prefix
, lenp
- 1);
10908 memcpy (name
+ lenp
- 1, p
, len
+ 1);
10909 return get_identifier (name
);
10912 /* Lookup REDUCTION_ID in the current scope, or create an artificial
10913 VAR_DECL, bind it into the current scope and return it. */
10916 c_omp_reduction_decl (tree reduction_id
)
10918 struct c_binding
*b
= I_SYMBOL_BINDING (reduction_id
);
10919 if (b
!= NULL
&& B_IN_CURRENT_SCOPE (b
))
10922 tree decl
= build_decl (BUILTINS_LOCATION
, VAR_DECL
,
10923 reduction_id
, integer_type_node
);
10924 DECL_ARTIFICIAL (decl
) = 1;
10925 DECL_EXTERNAL (decl
) = 1;
10926 TREE_STATIC (decl
) = 1;
10927 TREE_PUBLIC (decl
) = 0;
10928 bind (reduction_id
, decl
, current_scope
, true, false, BUILTINS_LOCATION
);
10932 /* Lookup REDUCTION_ID in the first scope where it has entry for TYPE. */
10935 c_omp_reduction_lookup (tree reduction_id
, tree type
)
10937 struct c_binding
*b
= I_SYMBOL_BINDING (reduction_id
);
10941 for (t
= DECL_INITIAL (b
->decl
); t
; t
= TREE_CHAIN (t
))
10942 if (comptypes (TREE_PURPOSE (t
), type
))
10943 return TREE_VALUE (t
);
10946 return error_mark_node
;
10949 /* Helper function called via walk_tree, to diagnose invalid
10950 #pragma omp declare reduction combiners or initializers. */
10953 c_check_omp_declare_reduction_r (tree
*tp
, int *, void *data
)
10955 tree
*vars
= (tree
*) data
;
10956 if (SSA_VAR_P (*tp
)
10957 && !DECL_ARTIFICIAL (*tp
)
10961 location_t loc
= DECL_SOURCE_LOCATION (vars
[0]);
10962 if (strcmp (IDENTIFIER_POINTER (DECL_NAME (vars
[0])), "omp_out") == 0)
10963 error_at (loc
, "%<#pragma omp declare reduction%> combiner refers to "
10964 "variable %qD which is not %<omp_out%> nor %<omp_in%>",
10967 error_at (loc
, "%<#pragma omp declare reduction%> initializer refers "
10968 "to variable %qD which is not %<omp_priv%> nor "
10976 #include "gt-c-c-decl.h"