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 struct c_arg_info
*arg_info
= 0;
5355 addr_space_t as1
, as2
, address_space
;
5356 location_t loc
= UNKNOWN_LOCATION
;
5359 bool expr_const_operands_dummy
;
5360 enum c_declarator_kind first_non_attr_kind
;
5361 unsigned int alignas_align
= 0;
5363 if (TREE_CODE (type
) == ERROR_MARK
)
5364 return error_mark_node
;
5367 if (expr_const_operands
== NULL
)
5368 expr_const_operands
= &expr_const_operands_dummy
;
5370 *expr
= declspecs
->expr
;
5371 *expr_const_operands
= declspecs
->expr_const_operands
;
5373 if (decl_context
== FUNCDEF
)
5374 funcdef_flag
= true, decl_context
= NORMAL
;
5376 /* Look inside a declarator for the name being declared
5377 and get it as an IDENTIFIER_NODE, for an error message. */
5379 const struct c_declarator
*decl
= declarator
;
5381 first_non_attr_kind
= cdk_attrs
;
5391 funcdef_syntax
= (decl
->kind
== cdk_function
);
5392 decl
= decl
->declarator
;
5393 if (first_non_attr_kind
== cdk_attrs
)
5394 first_non_attr_kind
= decl
->kind
;
5398 decl
= decl
->declarator
;
5405 if (first_non_attr_kind
== cdk_attrs
)
5406 first_non_attr_kind
= decl
->kind
;
5415 gcc_assert (decl_context
== PARM
5416 || decl_context
== TYPENAME
5417 || (decl_context
== FIELD
5418 && declarator
->kind
== cdk_id
));
5419 gcc_assert (!initialized
);
5423 /* A function definition's declarator must have the form of
5424 a function declarator. */
5426 if (funcdef_flag
&& !funcdef_syntax
)
5429 /* If this looks like a function definition, make it one,
5430 even if it occurs where parms are expected.
5431 Then store_parm_decls will reject it and not use it as a parm. */
5432 if (decl_context
== NORMAL
&& !funcdef_flag
&& current_scope
->parm_flag
)
5433 decl_context
= PARM
;
5435 if (declspecs
->deprecated_p
&& deprecated_state
!= DEPRECATED_SUPPRESS
)
5436 warn_deprecated_use (declspecs
->type
, declspecs
->decl_attr
);
5438 if ((decl_context
== NORMAL
|| decl_context
== FIELD
)
5439 && current_scope
== file_scope
5440 && variably_modified_type_p (type
, NULL_TREE
))
5443 error_at (loc
, "variably modified %qE at file scope", name
);
5445 error_at (loc
, "variably modified field at file scope");
5446 type
= integer_type_node
;
5449 size_varies
= C_TYPE_VARIABLE_SIZE (type
) != 0;
5451 /* Diagnose defaulting to "int". */
5453 if (declspecs
->default_int_p
&& !in_system_header_at (input_location
))
5455 /* Issue a warning if this is an ISO C 99 program or if
5456 -Wreturn-type and this is a function, or if -Wimplicit;
5457 prefer the former warning since it is more explicit. */
5458 if ((warn_implicit_int
|| warn_return_type
|| flag_isoc99
)
5460 warn_about_return_type
= 1;
5464 warn_defaults_to (loc
, OPT_Wimplicit_int
,
5465 "type defaults to %<int%> in declaration "
5468 warn_defaults_to (loc
, OPT_Wimplicit_int
,
5469 "type defaults to %<int%> in type name");
5473 /* Adjust the type if a bit-field is being declared,
5474 -funsigned-bitfields applied and the type is not explicitly
5476 if (bitfield
&& !flag_signed_bitfields
&& !declspecs
->explicit_signed_p
5477 && TREE_CODE (type
) == INTEGER_TYPE
)
5478 type
= unsigned_type_for (type
);
5480 /* Figure out the type qualifiers for the declaration. There are
5481 two ways a declaration can become qualified. One is something
5482 like `const int i' where the `const' is explicit. Another is
5483 something like `typedef const int CI; CI i' where the type of the
5484 declaration contains the `const'. A third possibility is that
5485 there is a type qualifier on the element type of a typedefed
5486 array type, in which case we should extract that qualifier so
5487 that c_apply_type_quals_to_decl receives the full list of
5488 qualifiers to work with (C90 is not entirely clear about whether
5489 duplicate qualifiers should be diagnosed in this case, but it
5490 seems most appropriate to do so). */
5491 element_type
= strip_array_types (type
);
5492 constp
= declspecs
->const_p
+ TYPE_READONLY (element_type
);
5493 restrictp
= declspecs
->restrict_p
+ TYPE_RESTRICT (element_type
);
5494 volatilep
= declspecs
->volatile_p
+ TYPE_VOLATILE (element_type
);
5495 atomicp
= declspecs
->atomic_p
+ TYPE_ATOMIC (element_type
);
5496 as1
= declspecs
->address_space
;
5497 as2
= TYPE_ADDR_SPACE (element_type
);
5498 address_space
= ADDR_SPACE_GENERIC_P (as1
)? as2
: as1
;
5501 pedwarn_c90 (loc
, OPT_Wpedantic
, "duplicate %<const%>");
5503 pedwarn_c90 (loc
, OPT_Wpedantic
, "duplicate %<restrict%>");
5505 pedwarn_c90 (loc
, OPT_Wpedantic
, "duplicate %<volatile%>");
5507 pedwarn_c90 (loc
, OPT_Wpedantic
, "duplicate %<_Atomic%>");
5509 if (!ADDR_SPACE_GENERIC_P (as1
) && !ADDR_SPACE_GENERIC_P (as2
) && as1
!= as2
)
5510 error_at (loc
, "conflicting named address spaces (%s vs %s)",
5511 c_addr_space_name (as1
), c_addr_space_name (as2
));
5513 if ((TREE_CODE (type
) == ARRAY_TYPE
5514 || first_non_attr_kind
== cdk_array
)
5515 && TYPE_QUALS (element_type
))
5516 type
= TYPE_MAIN_VARIANT (type
);
5517 type_quals
= ((constp
? TYPE_QUAL_CONST
: 0)
5518 | (restrictp
? TYPE_QUAL_RESTRICT
: 0)
5519 | (volatilep
? TYPE_QUAL_VOLATILE
: 0)
5520 | (atomicp
? TYPE_QUAL_ATOMIC
: 0)
5521 | ENCODE_QUAL_ADDR_SPACE (address_space
));
5523 /* Applying the _Atomic qualifier to an array type (through the use
5524 of typedefs or typeof) must be detected here. If the qualifier
5525 is introduced later, any appearance of applying it to an array is
5526 actually applying it to an element of that array. */
5527 if (atomicp
&& TREE_CODE (type
) == ARRAY_TYPE
)
5528 error_at (loc
, "%<_Atomic%>-qualified array type");
5530 /* Warn about storage classes that are invalid for certain
5531 kinds of declarations (parameters, typenames, etc.). */
5535 || storage_class
== csc_auto
5536 || storage_class
== csc_register
5537 || storage_class
== csc_typedef
))
5539 if (storage_class
== csc_auto
)
5541 (current_scope
== file_scope
) ? 0 : OPT_Wpedantic
,
5542 "function definition declared %<auto%>");
5543 if (storage_class
== csc_register
)
5544 error_at (loc
, "function definition declared %<register%>");
5545 if (storage_class
== csc_typedef
)
5546 error_at (loc
, "function definition declared %<typedef%>");
5548 error_at (loc
, "function definition declared %qs",
5549 declspecs
->thread_gnu_p
? "__thread" : "_Thread_local");
5551 if (storage_class
== csc_auto
5552 || storage_class
== csc_register
5553 || storage_class
== csc_typedef
)
5554 storage_class
= csc_none
;
5556 else if (decl_context
!= NORMAL
&& (storage_class
!= csc_none
|| threadp
))
5558 if (decl_context
== PARM
&& storage_class
== csc_register
)
5562 switch (decl_context
)
5566 error_at (loc
, "storage class specified for structure "
5569 error_at (loc
, "storage class specified for structure field");
5573 error_at (loc
, "storage class specified for parameter %qE",
5576 error_at (loc
, "storage class specified for unnamed parameter");
5579 error_at (loc
, "storage class specified for typename");
5582 storage_class
= csc_none
;
5586 else if (storage_class
== csc_extern
5590 /* 'extern' with initialization is invalid if not at file scope. */
5591 if (current_scope
== file_scope
)
5593 /* It is fine to have 'extern const' when compiling at C
5594 and C++ intersection. */
5595 if (!(warn_cxx_compat
&& constp
))
5596 warning_at (loc
, 0, "%qE initialized and declared %<extern%>",
5600 error_at (loc
, "%qE has both %<extern%> and initializer", name
);
5602 else if (current_scope
== file_scope
)
5604 if (storage_class
== csc_auto
)
5605 error_at (loc
, "file-scope declaration of %qE specifies %<auto%>",
5607 if (pedantic
&& storage_class
== csc_register
)
5608 pedwarn (input_location
, OPT_Wpedantic
,
5609 "file-scope declaration of %qE specifies %<register%>", name
);
5613 if (storage_class
== csc_extern
&& funcdef_flag
)
5614 error_at (loc
, "nested function %qE declared %<extern%>", name
);
5615 else if (threadp
&& storage_class
== csc_none
)
5617 error_at (loc
, "function-scope %qE implicitly auto and declared "
5619 declspecs
->thread_gnu_p
? "__thread" : "_Thread_local");
5624 /* Now figure out the structure of the declarator proper.
5625 Descend through it, creating more complex types, until we reach
5626 the declared identifier (or NULL_TREE, in an absolute declarator).
5627 At each stage we maintain an unqualified version of the type
5628 together with any qualifiers that should be applied to it with
5629 c_build_qualified_type; this way, array types including
5630 multidimensional array types are first built up in unqualified
5631 form and then the qualified form is created with
5632 TYPE_MAIN_VARIANT pointing to the unqualified form. */
5634 while (declarator
&& declarator
->kind
!= cdk_id
)
5636 if (type
== error_mark_node
)
5638 declarator
= declarator
->declarator
;
5642 /* Each level of DECLARATOR is either a cdk_array (for ...[..]),
5643 a cdk_pointer (for *...),
5644 a cdk_function (for ...(...)),
5645 a cdk_attrs (for nested attributes),
5646 or a cdk_id (for the name being declared
5647 or the place in an absolute declarator
5648 where the name was omitted).
5649 For the last case, we have just exited the loop.
5651 At this point, TYPE is the type of elements of an array,
5652 or for a function to return, or for a pointer to point to.
5653 After this sequence of ifs, TYPE is the type of the
5654 array or function or pointer, and DECLARATOR has had its
5655 outermost layer removed. */
5657 if (array_ptr_quals
!= TYPE_UNQUALIFIED
5658 || array_ptr_attrs
!= NULL_TREE
5659 || array_parm_static
)
5661 /* Only the innermost declarator (making a parameter be of
5662 array type which is converted to pointer type)
5663 may have static or type qualifiers. */
5664 error_at (loc
, "static or type qualifiers in non-parameter array declarator");
5665 array_ptr_quals
= TYPE_UNQUALIFIED
;
5666 array_ptr_attrs
= NULL_TREE
;
5667 array_parm_static
= 0;
5670 switch (declarator
->kind
)
5674 /* A declarator with embedded attributes. */
5675 tree attrs
= declarator
->u
.attrs
;
5676 const struct c_declarator
*inner_decl
;
5678 declarator
= declarator
->declarator
;
5679 inner_decl
= declarator
;
5680 while (inner_decl
->kind
== cdk_attrs
)
5681 inner_decl
= inner_decl
->declarator
;
5682 if (inner_decl
->kind
== cdk_id
)
5683 attr_flags
|= (int) ATTR_FLAG_DECL_NEXT
;
5684 else if (inner_decl
->kind
== cdk_function
)
5685 attr_flags
|= (int) ATTR_FLAG_FUNCTION_NEXT
;
5686 else if (inner_decl
->kind
== cdk_array
)
5687 attr_flags
|= (int) ATTR_FLAG_ARRAY_NEXT
;
5688 returned_attrs
= decl_attributes (&type
,
5689 chainon (returned_attrs
, attrs
),
5695 tree itype
= NULL_TREE
;
5696 tree size
= declarator
->u
.array
.dimen
;
5697 /* The index is a signed object `sizetype' bits wide. */
5698 tree index_type
= c_common_signed_type (sizetype
);
5700 array_ptr_quals
= declarator
->u
.array
.quals
;
5701 array_ptr_attrs
= declarator
->u
.array
.attrs
;
5702 array_parm_static
= declarator
->u
.array
.static_p
;
5703 array_parm_vla_unspec_p
= declarator
->u
.array
.vla_unspec_p
;
5705 declarator
= declarator
->declarator
;
5707 /* Check for some types that there cannot be arrays of. */
5709 if (VOID_TYPE_P (type
))
5712 error_at (loc
, "declaration of %qE as array of voids", name
);
5714 error_at (loc
, "declaration of type name as array of voids");
5715 type
= error_mark_node
;
5718 if (TREE_CODE (type
) == FUNCTION_TYPE
)
5721 error_at (loc
, "declaration of %qE as array of functions",
5724 error_at (loc
, "declaration of type name as array of "
5726 type
= error_mark_node
;
5729 if (pedantic
&& !in_system_header_at (input_location
)
5730 && flexible_array_type_p (type
))
5731 pedwarn (loc
, OPT_Wpedantic
,
5732 "invalid use of structure with flexible array member");
5734 if (size
== error_mark_node
)
5735 type
= error_mark_node
;
5737 if (type
== error_mark_node
)
5740 /* If size was specified, set ITYPE to a range-type for
5741 that size. Otherwise, ITYPE remains null. finish_decl
5742 may figure it out from an initial value. */
5746 bool size_maybe_const
= true;
5747 bool size_int_const
= (TREE_CODE (size
) == INTEGER_CST
5748 && !TREE_OVERFLOW (size
));
5749 bool this_size_varies
= false;
5751 /* Strip NON_LVALUE_EXPRs since we aren't using as an
5753 STRIP_TYPE_NOPS (size
);
5755 if (!INTEGRAL_TYPE_P (TREE_TYPE (size
)))
5758 error_at (loc
, "size of array %qE has non-integer type",
5762 "size of unnamed array has non-integer type");
5763 size
= integer_one_node
;
5766 size
= c_fully_fold (size
, false, &size_maybe_const
);
5768 if (pedantic
&& size_maybe_const
&& integer_zerop (size
))
5771 pedwarn (loc
, OPT_Wpedantic
,
5772 "ISO C forbids zero-size array %qE", name
);
5774 pedwarn (loc
, OPT_Wpedantic
,
5775 "ISO C forbids zero-size array");
5778 if (TREE_CODE (size
) == INTEGER_CST
&& size_maybe_const
)
5780 constant_expression_warning (size
);
5781 if (tree_int_cst_sgn (size
) < 0)
5784 error_at (loc
, "size of array %qE is negative", name
);
5786 error_at (loc
, "size of unnamed array is negative");
5787 size
= integer_one_node
;
5789 /* Handle a size folded to an integer constant but
5790 not an integer constant expression. */
5791 if (!size_int_const
)
5793 /* If this is a file scope declaration of an
5794 ordinary identifier, this is invalid code;
5795 diagnosing it here and not subsequently
5796 treating the type as variable-length avoids
5797 more confusing diagnostics later. */
5798 if ((decl_context
== NORMAL
|| decl_context
== FIELD
)
5799 && current_scope
== file_scope
)
5800 pedwarn (input_location
, 0,
5801 "variably modified %qE at file scope",
5804 this_size_varies
= size_varies
= true;
5805 warn_variable_length_array (name
, size
);
5808 else if ((decl_context
== NORMAL
|| decl_context
== FIELD
)
5809 && current_scope
== file_scope
)
5811 error_at (loc
, "variably modified %qE at file scope", name
);
5812 size
= integer_one_node
;
5816 /* Make sure the array size remains visibly
5817 nonconstant even if it is (eg) a const variable
5818 with known value. */
5819 this_size_varies
= size_varies
= true;
5820 warn_variable_length_array (name
, size
);
5821 if (flag_sanitize
& SANITIZE_VLA
5822 && decl_context
== NORMAL
5823 && do_ubsan_in_current_function ())
5825 /* Evaluate the array size only once. */
5826 size
= c_save_expr (size
);
5827 size
= c_fully_fold (size
, false, NULL
);
5828 size
= fold_build2 (COMPOUND_EXPR
, TREE_TYPE (size
),
5829 ubsan_instrument_vla (loc
, size
),
5834 if (integer_zerop (size
) && !this_size_varies
)
5836 /* A zero-length array cannot be represented with
5837 an unsigned index type, which is what we'll
5838 get with build_index_type. Create an
5839 open-ended range instead. */
5840 itype
= build_range_type (sizetype
, size
, NULL_TREE
);
5844 /* Arrange for the SAVE_EXPR on the inside of the
5845 MINUS_EXPR, which allows the -1 to get folded
5846 with the +1 that happens when building TYPE_SIZE. */
5848 size
= save_expr (size
);
5849 if (this_size_varies
&& TREE_CODE (size
) == INTEGER_CST
)
5850 size
= build2 (COMPOUND_EXPR
, TREE_TYPE (size
),
5851 integer_zero_node
, size
);
5853 /* Compute the maximum valid index, that is, size
5854 - 1. Do the calculation in index_type, so that
5855 if it is a variable the computations will be
5856 done in the proper mode. */
5857 itype
= fold_build2_loc (loc
, MINUS_EXPR
, index_type
,
5858 convert (index_type
, size
),
5859 convert (index_type
,
5862 /* The above overflows when size does not fit
5864 ??? While a size of INT_MAX+1 technically shouldn't
5865 cause an overflow (because we subtract 1), handling
5866 this case seems like an unnecessary complication. */
5867 if (TREE_CODE (size
) == INTEGER_CST
5868 && !int_fits_type_p (size
, index_type
))
5871 error_at (loc
, "size of array %qE is too large",
5874 error_at (loc
, "size of unnamed array is too large");
5875 type
= error_mark_node
;
5879 itype
= build_index_type (itype
);
5881 if (this_size_varies
)
5884 *expr
= build2 (COMPOUND_EXPR
, TREE_TYPE (size
),
5888 *expr_const_operands
&= size_maybe_const
;
5891 else if (decl_context
== FIELD
)
5893 bool flexible_array_member
= false;
5894 if (array_parm_vla_unspec_p
)
5895 /* Field names can in fact have function prototype
5896 scope so [*] is disallowed here through making
5897 the field variably modified, not through being
5898 something other than a declaration with function
5903 const struct c_declarator
*t
= declarator
;
5904 while (t
->kind
== cdk_attrs
)
5906 flexible_array_member
= (t
->kind
== cdk_id
);
5908 if (flexible_array_member
5909 && !in_system_header_at (input_location
))
5910 pedwarn_c90 (loc
, OPT_Wpedantic
, "ISO C90 does not "
5911 "support flexible array members");
5913 /* ISO C99 Flexible array members are effectively
5914 identical to GCC's zero-length array extension. */
5915 if (flexible_array_member
|| array_parm_vla_unspec_p
)
5916 itype
= build_range_type (sizetype
, size_zero_node
,
5919 else if (decl_context
== PARM
)
5921 if (array_parm_vla_unspec_p
)
5923 itype
= build_range_type (sizetype
, size_zero_node
, NULL_TREE
);
5927 else if (decl_context
== TYPENAME
)
5929 if (array_parm_vla_unspec_p
)
5932 warning (0, "%<[*]%> not in a declaration");
5933 /* We use this to avoid messing up with incomplete
5934 array types of the same type, that would
5935 otherwise be modified below. */
5936 itype
= build_range_type (sizetype
, size_zero_node
,
5942 /* Complain about arrays of incomplete types. */
5943 if (!COMPLETE_TYPE_P (type
))
5945 error_at (loc
, "array type has incomplete element type %qT",
5947 type
= error_mark_node
;
5950 /* When itype is NULL, a shared incomplete array type is
5951 returned for all array of a given type. Elsewhere we
5952 make sure we don't complete that type before copying
5953 it, but here we want to make sure we don't ever
5954 modify the shared type, so we gcc_assert (itype)
5957 addr_space_t as
= DECODE_QUAL_ADDR_SPACE (type_quals
);
5958 if (!ADDR_SPACE_GENERIC_P (as
) && as
!= TYPE_ADDR_SPACE (type
))
5959 type
= build_qualified_type (type
,
5960 ENCODE_QUAL_ADDR_SPACE (as
));
5962 type
= build_array_type (type
, itype
);
5965 if (type
!= error_mark_node
)
5969 /* It is ok to modify type here even if itype is
5970 NULL: if size_varies, we're in a
5971 multi-dimensional array and the inner type has
5972 variable size, so the enclosing shared array type
5974 if (size
&& TREE_CODE (size
) == INTEGER_CST
)
5976 = build_distinct_type_copy (TYPE_MAIN_VARIANT (type
));
5977 C_TYPE_VARIABLE_SIZE (type
) = 1;
5980 /* The GCC extension for zero-length arrays differs from
5981 ISO flexible array members in that sizeof yields
5983 if (size
&& integer_zerop (size
))
5986 type
= build_distinct_type_copy (TYPE_MAIN_VARIANT (type
));
5987 TYPE_SIZE (type
) = bitsize_zero_node
;
5988 TYPE_SIZE_UNIT (type
) = size_zero_node
;
5989 SET_TYPE_STRUCTURAL_EQUALITY (type
);
5991 if (array_parm_vla_unspec_p
)
5994 /* The type is complete. C99 6.7.5.2p4 */
5995 type
= build_distinct_type_copy (TYPE_MAIN_VARIANT (type
));
5996 TYPE_SIZE (type
) = bitsize_zero_node
;
5997 TYPE_SIZE_UNIT (type
) = size_zero_node
;
5998 SET_TYPE_STRUCTURAL_EQUALITY (type
);
6001 if (!valid_array_size_p (loc
, type
, name
))
6002 type
= error_mark_node
;
6005 if (decl_context
!= PARM
6006 && (array_ptr_quals
!= TYPE_UNQUALIFIED
6007 || array_ptr_attrs
!= NULL_TREE
6008 || array_parm_static
))
6010 error_at (loc
, "static or type qualifiers in non-parameter "
6011 "array declarator");
6012 array_ptr_quals
= TYPE_UNQUALIFIED
;
6013 array_ptr_attrs
= NULL_TREE
;
6014 array_parm_static
= 0;
6020 /* Say it's a definition only for the declarator closest
6021 to the identifier, apart possibly from some
6023 bool really_funcdef
= false;
6027 const struct c_declarator
*t
= declarator
->declarator
;
6028 while (t
->kind
== cdk_attrs
)
6030 really_funcdef
= (t
->kind
== cdk_id
);
6033 /* Declaring a function type. Make sure we have a valid
6034 type for the function to return. */
6035 if (type
== error_mark_node
)
6038 size_varies
= false;
6040 /* Warn about some types functions can't return. */
6041 if (TREE_CODE (type
) == FUNCTION_TYPE
)
6044 error_at (loc
, "%qE declared as function returning a "
6047 error_at (loc
, "type name declared as function "
6048 "returning a function");
6049 type
= integer_type_node
;
6051 if (TREE_CODE (type
) == ARRAY_TYPE
)
6054 error_at (loc
, "%qE declared as function returning an array",
6057 error_at (loc
, "type name declared as function returning "
6059 type
= integer_type_node
;
6061 errmsg
= targetm
.invalid_return_type (type
);
6065 type
= integer_type_node
;
6068 /* Construct the function type and go to the next
6069 inner layer of declarator. */
6070 arg_info
= declarator
->u
.arg_info
;
6071 arg_types
= grokparms (arg_info
, really_funcdef
);
6073 /* Type qualifiers before the return type of the function
6074 qualify the return type, not the function type. */
6077 /* Type qualifiers on a function return type are
6078 normally permitted by the standard but have no
6079 effect, so give a warning at -Wreturn-type.
6080 Qualifiers on a void return type are banned on
6081 function definitions in ISO C; GCC used to used
6082 them for noreturn functions. */
6083 if (VOID_TYPE_P (type
) && really_funcdef
)
6085 "function definition has qualified void return type");
6087 warning_at (loc
, OPT_Wignored_qualifiers
,
6088 "type qualifiers ignored on function return type");
6090 type
= c_build_qualified_type (type
, type_quals
);
6092 type_quals
= TYPE_UNQUALIFIED
;
6094 type
= build_function_type (type
, arg_types
);
6095 declarator
= declarator
->declarator
;
6097 /* Set the TYPE_CONTEXTs for each tagged type which is local to
6098 the formal parameter list of this FUNCTION_TYPE to point to
6099 the FUNCTION_TYPE node itself. */
6104 FOR_EACH_VEC_SAFE_ELT_REVERSE (arg_info
->tags
, ix
, tag
)
6105 TYPE_CONTEXT (tag
->type
) = type
;
6111 /* Merge any constancy or volatility into the target type
6113 if ((type_quals
& TYPE_QUAL_ATOMIC
)
6114 && TREE_CODE (type
) == FUNCTION_TYPE
)
6117 "%<_Atomic%>-qualified function type");
6118 type_quals
&= ~TYPE_QUAL_ATOMIC
;
6120 else if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
6122 pedwarn (loc
, OPT_Wpedantic
,
6123 "ISO C forbids qualified function types");
6125 type
= c_build_qualified_type (type
, type_quals
);
6126 size_varies
= false;
6128 /* When the pointed-to type involves components of variable size,
6129 care must be taken to ensure that the size evaluation code is
6130 emitted early enough to dominate all the possible later uses
6131 and late enough for the variables on which it depends to have
6134 This is expected to happen automatically when the pointed-to
6135 type has a name/declaration of it's own, but special attention
6136 is required if the type is anonymous.
6138 We handle the NORMAL and FIELD contexts here by attaching an
6139 artificial TYPE_DECL to such pointed-to type. This forces the
6140 sizes evaluation at a safe point and ensures it is not deferred
6141 until e.g. within a deeper conditional context.
6143 We expect nothing to be needed here for PARM or TYPENAME.
6144 Pushing a TYPE_DECL at this point for TYPENAME would actually
6145 be incorrect, as we might be in the middle of an expression
6146 with side effects on the pointed-to type size "arguments" prior
6147 to the pointer declaration point and the fake TYPE_DECL in the
6148 enclosing context would force the size evaluation prior to the
6151 if (!TYPE_NAME (type
)
6152 && (decl_context
== NORMAL
|| decl_context
== FIELD
)
6153 && variably_modified_type_p (type
, NULL_TREE
))
6155 tree decl
= build_decl (loc
, TYPE_DECL
, NULL_TREE
, type
);
6156 DECL_ARTIFICIAL (decl
) = 1;
6158 finish_decl (decl
, loc
, NULL_TREE
, NULL_TREE
, NULL_TREE
);
6159 TYPE_NAME (type
) = decl
;
6162 type
= c_build_pointer_type (type
);
6164 /* Process type qualifiers (such as const or volatile)
6165 that were given inside the `*'. */
6166 type_quals
= declarator
->u
.pointer_quals
;
6168 declarator
= declarator
->declarator
;
6175 *decl_attrs
= chainon (returned_attrs
, *decl_attrs
);
6177 /* Now TYPE has the actual type, apart from any qualifiers in
6180 /* Warn about address space used for things other than static memory or
6182 address_space
= DECODE_QUAL_ADDR_SPACE (type_quals
);
6183 if (!ADDR_SPACE_GENERIC_P (address_space
))
6185 if (decl_context
== NORMAL
)
6187 switch (storage_class
)
6190 error ("%qs combined with %<auto%> qualifier for %qE",
6191 c_addr_space_name (address_space
), name
);
6194 error ("%qs combined with %<register%> qualifier for %qE",
6195 c_addr_space_name (address_space
), name
);
6198 if (current_function_scope
)
6200 error ("%qs specified for auto variable %qE",
6201 c_addr_space_name (address_space
), name
);
6213 else if (decl_context
== PARM
&& TREE_CODE (type
) != ARRAY_TYPE
)
6216 error ("%qs specified for parameter %qE",
6217 c_addr_space_name (address_space
), name
);
6219 error ("%qs specified for unnamed parameter",
6220 c_addr_space_name (address_space
));
6222 else if (decl_context
== FIELD
)
6225 error ("%qs specified for structure field %qE",
6226 c_addr_space_name (address_space
), name
);
6228 error ("%qs specified for structure field",
6229 c_addr_space_name (address_space
));
6233 /* Check the type and width of a bit-field. */
6236 check_bitfield_type_and_width (loc
, &type
, width
, name
);
6237 /* C11 makes it implementation-defined (6.7.2.1#5) whether
6238 atomic types are permitted for bit-fields; we have no code to
6239 make bit-field accesses atomic, so disallow them. */
6240 if (type_quals
& TYPE_QUAL_ATOMIC
)
6243 error_at (loc
, "bit-field %qE has atomic type", name
);
6245 error_at (loc
, "bit-field has atomic type");
6246 type_quals
&= ~TYPE_QUAL_ATOMIC
;
6250 /* Reject invalid uses of _Alignas. */
6251 if (declspecs
->alignas_p
)
6253 if (storage_class
== csc_typedef
)
6254 error_at (loc
, "alignment specified for typedef %qE", name
);
6255 else if (storage_class
== csc_register
)
6256 error_at (loc
, "alignment specified for %<register%> object %qE",
6258 else if (decl_context
== PARM
)
6261 error_at (loc
, "alignment specified for parameter %qE", name
);
6263 error_at (loc
, "alignment specified for unnamed parameter");
6268 error_at (loc
, "alignment specified for bit-field %qE", name
);
6270 error_at (loc
, "alignment specified for unnamed bit-field");
6272 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
6273 error_at (loc
, "alignment specified for function %qE", name
);
6274 else if (declspecs
->align_log
!= -1)
6276 alignas_align
= 1U << declspecs
->align_log
;
6277 if (alignas_align
< min_align_of_type (type
))
6280 error_at (loc
, "%<_Alignas%> specifiers cannot reduce "
6281 "alignment of %qE", name
);
6283 error_at (loc
, "%<_Alignas%> specifiers cannot reduce "
6284 "alignment of unnamed field");
6290 /* If this is declaring a typedef name, return a TYPE_DECL. */
6292 if (storage_class
== csc_typedef
)
6295 if ((type_quals
& TYPE_QUAL_ATOMIC
)
6296 && TREE_CODE (type
) == FUNCTION_TYPE
)
6299 "%<_Atomic%>-qualified function type");
6300 type_quals
&= ~TYPE_QUAL_ATOMIC
;
6302 else if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
6304 pedwarn (loc
, OPT_Wpedantic
,
6305 "ISO C forbids qualified function types");
6307 type
= c_build_qualified_type (type
, type_quals
);
6308 decl
= build_decl (declarator
->id_loc
,
6309 TYPE_DECL
, declarator
->u
.id
, type
);
6310 if (declspecs
->explicit_signed_p
)
6311 C_TYPEDEF_EXPLICITLY_SIGNED (decl
) = 1;
6312 if (declspecs
->inline_p
)
6313 pedwarn (loc
, 0,"typedef %q+D declared %<inline%>", decl
);
6314 if (declspecs
->noreturn_p
)
6315 pedwarn (loc
, 0,"typedef %q+D declared %<_Noreturn%>", decl
);
6317 if (warn_cxx_compat
&& declarator
->u
.id
!= NULL_TREE
)
6319 struct c_binding
*b
= I_TAG_BINDING (declarator
->u
.id
);
6322 && b
->decl
!= NULL_TREE
6323 && (B_IN_CURRENT_SCOPE (b
)
6324 || (current_scope
== file_scope
&& B_IN_EXTERNAL_SCOPE (b
)))
6325 && TYPE_MAIN_VARIANT (b
->decl
) != TYPE_MAIN_VARIANT (type
))
6327 warning_at (declarator
->id_loc
, OPT_Wc___compat
,
6328 ("using %qD as both a typedef and a tag is "
6331 if (b
->locus
!= UNKNOWN_LOCATION
)
6332 inform (b
->locus
, "originally defined here");
6339 /* If this is a type name (such as, in a cast or sizeof),
6340 compute the type and return it now. */
6342 if (decl_context
== TYPENAME
)
6344 /* Note that the grammar rejects storage classes in typenames
6346 gcc_assert (storage_class
== csc_none
&& !threadp
6347 && !declspecs
->inline_p
&& !declspecs
->noreturn_p
);
6348 if ((type_quals
& TYPE_QUAL_ATOMIC
)
6349 && TREE_CODE (type
) == FUNCTION_TYPE
)
6352 "%<_Atomic%>-qualified function type");
6353 type_quals
&= ~TYPE_QUAL_ATOMIC
;
6355 else if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
6357 pedwarn (loc
, OPT_Wpedantic
,
6358 "ISO C forbids const or volatile function types");
6360 type
= c_build_qualified_type (type
, type_quals
);
6364 if (pedantic
&& decl_context
== FIELD
6365 && variably_modified_type_p (type
, NULL_TREE
))
6368 pedwarn (loc
, OPT_Wpedantic
, "a member of a structure or union cannot "
6369 "have a variably modified type");
6372 /* Aside from typedefs and type names (handle above),
6373 `void' at top level (not within pointer)
6374 is allowed only in public variables.
6375 We don't complain about parms either, but that is because
6376 a better error message can be made later. */
6378 if (VOID_TYPE_P (type
) && decl_context
!= PARM
6379 && !((decl_context
!= FIELD
&& TREE_CODE (type
) != FUNCTION_TYPE
)
6380 && (storage_class
== csc_extern
6381 || (current_scope
== file_scope
6382 && !(storage_class
== csc_static
6383 || storage_class
== csc_register
)))))
6385 error_at (loc
, "variable or field %qE declared void", name
);
6386 type
= integer_type_node
;
6389 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
6390 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
6395 if (decl_context
== PARM
)
6398 bool array_parameter_p
= false;
6400 /* A parameter declared as an array of T is really a pointer to T.
6401 One declared as a function is really a pointer to a function. */
6403 if (TREE_CODE (type
) == ARRAY_TYPE
)
6405 /* Transfer const-ness of array into that of type pointed to. */
6406 type
= TREE_TYPE (type
);
6408 type
= c_build_qualified_type (type
, type_quals
);
6409 type
= c_build_pointer_type (type
);
6410 type_quals
= array_ptr_quals
;
6412 type
= c_build_qualified_type (type
, type_quals
);
6414 /* We don't yet implement attributes in this context. */
6415 if (array_ptr_attrs
!= NULL_TREE
)
6416 warning_at (loc
, OPT_Wattributes
,
6417 "attributes in parameter array declarator ignored");
6419 size_varies
= false;
6420 array_parameter_p
= true;
6422 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
6424 if (type_quals
& TYPE_QUAL_ATOMIC
)
6427 "%<_Atomic%>-qualified function type");
6428 type_quals
&= ~TYPE_QUAL_ATOMIC
;
6430 else if (type_quals
)
6431 pedwarn (loc
, OPT_Wpedantic
,
6432 "ISO C forbids qualified function types");
6434 type
= c_build_qualified_type (type
, type_quals
);
6435 type
= c_build_pointer_type (type
);
6436 type_quals
= TYPE_UNQUALIFIED
;
6438 else if (type_quals
)
6439 type
= c_build_qualified_type (type
, type_quals
);
6441 decl
= build_decl (declarator
->id_loc
,
6442 PARM_DECL
, declarator
->u
.id
, type
);
6444 C_DECL_VARIABLE_SIZE (decl
) = 1;
6445 C_ARRAY_PARAMETER (decl
) = array_parameter_p
;
6447 /* Compute the type actually passed in the parmlist,
6448 for the case where there is no prototype.
6449 (For example, shorts and chars are passed as ints.)
6450 When there is a prototype, this is overridden later. */
6452 if (type
== error_mark_node
)
6453 promoted_type
= type
;
6455 promoted_type
= c_type_promotes_to (type
);
6457 DECL_ARG_TYPE (decl
) = promoted_type
;
6458 if (declspecs
->inline_p
)
6459 pedwarn (loc
, 0, "parameter %q+D declared %<inline%>", decl
);
6460 if (declspecs
->noreturn_p
)
6461 pedwarn (loc
, 0, "parameter %q+D declared %<_Noreturn%>", decl
);
6463 else if (decl_context
== FIELD
)
6465 /* Note that the grammar rejects storage classes in typenames
6467 gcc_assert (storage_class
== csc_none
&& !threadp
6468 && !declspecs
->inline_p
&& !declspecs
->noreturn_p
);
6470 /* Structure field. It may not be a function. */
6472 if (TREE_CODE (type
) == FUNCTION_TYPE
)
6474 error_at (loc
, "field %qE declared as a function", name
);
6475 type
= build_pointer_type (type
);
6477 else if (TREE_CODE (type
) != ERROR_MARK
6478 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type
))
6481 error_at (loc
, "field %qE has incomplete type", name
);
6483 error_at (loc
, "unnamed field has incomplete type");
6484 type
= error_mark_node
;
6486 else if (TREE_CODE (type
) == ARRAY_TYPE
6487 && TYPE_DOMAIN (type
) == NULL_TREE
)
6489 /* We have a flexible array member through a typedef.
6490 Set suitable range. Whether this is a correct position
6491 for a flexible array member will be determined elsewhere. */
6492 if (!in_system_header_at (input_location
))
6493 pedwarn_c90 (loc
, OPT_Wpedantic
, "ISO C90 does not "
6494 "support flexible array members");
6495 type
= build_distinct_type_copy (TYPE_MAIN_VARIANT (type
));
6496 TYPE_DOMAIN (type
) = build_range_type (sizetype
, size_zero_node
,
6499 type
= c_build_qualified_type (type
, type_quals
);
6500 decl
= build_decl (declarator
->id_loc
,
6501 FIELD_DECL
, declarator
->u
.id
, type
);
6502 DECL_NONADDRESSABLE_P (decl
) = bitfield
;
6503 if (bitfield
&& !declarator
->u
.id
)
6504 TREE_NO_WARNING (decl
) = 1;
6507 C_DECL_VARIABLE_SIZE (decl
) = 1;
6509 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
6511 if (storage_class
== csc_register
|| threadp
)
6513 error_at (loc
, "invalid storage class for function %qE", name
);
6515 else if (current_scope
!= file_scope
)
6517 /* Function declaration not at file scope. Storage
6518 classes other than `extern' are not allowed, C99
6519 6.7.1p5, and `extern' makes no difference. However,
6520 GCC allows 'auto', perhaps with 'inline', to support
6521 nested functions. */
6522 if (storage_class
== csc_auto
)
6523 pedwarn (loc
, OPT_Wpedantic
,
6524 "invalid storage class for function %qE", name
);
6525 else if (storage_class
== csc_static
)
6527 error_at (loc
, "invalid storage class for function %qE", name
);
6529 storage_class
= declspecs
->storage_class
= csc_none
;
6535 decl
= build_decl (declarator
->id_loc
,
6536 FUNCTION_DECL
, declarator
->u
.id
, type
);
6537 decl
= build_decl_attribute_variant (decl
, decl_attr
);
6539 if (type_quals
& TYPE_QUAL_ATOMIC
)
6542 "%<_Atomic%>-qualified function type");
6543 type_quals
&= ~TYPE_QUAL_ATOMIC
;
6545 else if (pedantic
&& type_quals
&& !DECL_IN_SYSTEM_HEADER (decl
))
6546 pedwarn (loc
, OPT_Wpedantic
,
6547 "ISO C forbids qualified function types");
6549 /* Every function declaration is an external reference
6550 (DECL_EXTERNAL) except for those which are not at file
6551 scope and are explicitly declared "auto". This is
6552 forbidden by standard C (C99 6.7.1p5) and is interpreted by
6553 GCC to signify a forward declaration of a nested function. */
6554 if (storage_class
== csc_auto
&& current_scope
!= file_scope
)
6555 DECL_EXTERNAL (decl
) = 0;
6556 /* In C99, a function which is declared 'inline' with 'extern'
6557 is not an external reference (which is confusing). It
6558 means that the later definition of the function must be output
6559 in this file, C99 6.7.4p6. In GNU C89, a function declared
6560 'extern inline' is an external reference. */
6561 else if (declspecs
->inline_p
&& storage_class
!= csc_static
)
6562 DECL_EXTERNAL (decl
) = ((storage_class
== csc_extern
)
6563 == flag_gnu89_inline
);
6565 DECL_EXTERNAL (decl
) = !initialized
;
6567 /* Record absence of global scope for `static' or `auto'. */
6569 = !(storage_class
== csc_static
|| storage_class
== csc_auto
);
6571 /* For a function definition, record the argument information
6572 block where store_parm_decls will look for it. */
6574 current_function_arg_info
= arg_info
;
6576 if (declspecs
->default_int_p
)
6577 C_FUNCTION_IMPLICIT_INT (decl
) = 1;
6579 /* Record presence of `inline' and `_Noreturn', if it is
6581 if (flag_hosted
&& MAIN_NAME_P (declarator
->u
.id
))
6583 if (declspecs
->inline_p
)
6584 pedwarn (loc
, 0, "cannot inline function %<main%>");
6585 if (declspecs
->noreturn_p
)
6586 pedwarn (loc
, 0, "%<main%> declared %<_Noreturn%>");
6590 if (declspecs
->inline_p
)
6591 /* Record that the function is declared `inline'. */
6592 DECL_DECLARED_INLINE_P (decl
) = 1;
6593 if (declspecs
->noreturn_p
)
6596 pedwarn_c99 (loc
, OPT_Wpedantic
,
6597 "ISO C99 does not support %<_Noreturn%>");
6599 pedwarn_c99 (loc
, OPT_Wpedantic
,
6600 "ISO C90 does not support %<_Noreturn%>");
6601 TREE_THIS_VOLATILE (decl
) = 1;
6607 /* It's a variable. */
6608 /* An uninitialized decl with `extern' is a reference. */
6609 int extern_ref
= !initialized
&& storage_class
== csc_extern
;
6611 type
= c_build_qualified_type (type
, type_quals
);
6613 /* C99 6.2.2p7: It is invalid (compile-time undefined
6614 behavior) to create an 'extern' declaration for a
6615 variable if there is a global declaration that is
6616 'static' and the global declaration is not visible.
6617 (If the static declaration _is_ currently visible,
6618 the 'extern' declaration is taken to refer to that decl.) */
6619 if (extern_ref
&& current_scope
!= file_scope
)
6621 tree global_decl
= identifier_global_value (declarator
->u
.id
);
6622 tree visible_decl
= lookup_name (declarator
->u
.id
);
6625 && global_decl
!= visible_decl
6626 && VAR_P (global_decl
)
6627 && !TREE_PUBLIC (global_decl
))
6628 error_at (loc
, "variable previously declared %<static%> "
6629 "redeclared %<extern%>");
6632 decl
= build_decl (declarator
->id_loc
,
6633 VAR_DECL
, declarator
->u
.id
, type
);
6635 C_DECL_VARIABLE_SIZE (decl
) = 1;
6637 if (declspecs
->inline_p
)
6638 pedwarn (loc
, 0, "variable %q+D declared %<inline%>", decl
);
6639 if (declspecs
->noreturn_p
)
6640 pedwarn (loc
, 0, "variable %q+D declared %<_Noreturn%>", decl
);
6642 /* At file scope, an initialized extern declaration may follow
6643 a static declaration. In that case, DECL_EXTERNAL will be
6644 reset later in start_decl. */
6645 DECL_EXTERNAL (decl
) = (storage_class
== csc_extern
);
6647 /* At file scope, the presence of a `static' or `register' storage
6648 class specifier, or the absence of all storage class specifiers
6649 makes this declaration a definition (perhaps tentative). Also,
6650 the absence of `static' makes it public. */
6651 if (current_scope
== file_scope
)
6653 TREE_PUBLIC (decl
) = storage_class
!= csc_static
;
6654 TREE_STATIC (decl
) = !extern_ref
;
6656 /* Not at file scope, only `static' makes a static definition. */
6659 TREE_STATIC (decl
) = (storage_class
== csc_static
);
6660 TREE_PUBLIC (decl
) = extern_ref
;
6664 set_decl_tls_model (decl
, decl_default_tls_model (decl
));
6667 if ((storage_class
== csc_extern
6668 || (storage_class
== csc_none
6669 && TREE_CODE (type
) == FUNCTION_TYPE
6671 && variably_modified_type_p (type
, NULL_TREE
))
6674 if (TREE_CODE (type
) == FUNCTION_TYPE
)
6675 error_at (loc
, "non-nested function with variably modified type");
6677 error_at (loc
, "object with variably modified type must have "
6681 /* Record `register' declaration for warnings on &
6682 and in case doing stupid register allocation. */
6684 if (storage_class
== csc_register
)
6686 C_DECL_REGISTER (decl
) = 1;
6687 DECL_REGISTER (decl
) = 1;
6690 /* Record constancy and volatility. */
6691 c_apply_type_quals_to_decl (type_quals
, decl
);
6693 /* Apply _Alignas specifiers. */
6696 DECL_ALIGN (decl
) = alignas_align
* BITS_PER_UNIT
;
6697 DECL_USER_ALIGN (decl
) = 1;
6700 /* If a type has volatile components, it should be stored in memory.
6701 Otherwise, the fact that those components are volatile
6702 will be ignored, and would even crash the compiler.
6703 Of course, this only makes sense on VAR,PARM, and RESULT decl's. */
6704 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl
))
6705 && (VAR_P (decl
) || TREE_CODE (decl
) == PARM_DECL
6706 || TREE_CODE (decl
) == RESULT_DECL
))
6708 /* It is not an error for a structure with volatile fields to
6709 be declared register, but reset DECL_REGISTER since it
6710 cannot actually go in a register. */
6711 int was_reg
= C_DECL_REGISTER (decl
);
6712 C_DECL_REGISTER (decl
) = 0;
6713 DECL_REGISTER (decl
) = 0;
6714 c_mark_addressable (decl
);
6715 C_DECL_REGISTER (decl
) = was_reg
;
6718 /* This is the earliest point at which we might know the assembler
6719 name of a variable. Thus, if it's known before this, die horribly. */
6720 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl
));
6724 && TREE_PUBLIC (decl
)
6725 && TREE_STATIC (decl
)
6726 && (RECORD_OR_UNION_TYPE_P (TREE_TYPE (decl
))
6727 || TREE_CODE (TREE_TYPE (decl
)) == ENUMERAL_TYPE
)
6728 && TYPE_NAME (TREE_TYPE (decl
)) == NULL_TREE
)
6729 warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wc___compat
,
6730 ("non-local variable %qD with anonymous type is "
6731 "questionable in C++"),
6738 /* Decode the parameter-list info for a function type or function definition.
6739 The argument is the value returned by `get_parm_info' (or made in c-parse.c
6740 if there is an identifier list instead of a parameter decl list).
6741 These two functions are separate because when a function returns
6742 or receives functions then each is called multiple times but the order
6743 of calls is different. The last call to `grokparms' is always the one
6744 that contains the formal parameter names of a function definition.
6746 Return a list of arg types to use in the FUNCTION_TYPE for this function.
6748 FUNCDEF_FLAG is true for a function definition, false for
6749 a mere declaration. A nonempty identifier-list gets an error message
6750 when FUNCDEF_FLAG is false. */
6753 grokparms (struct c_arg_info
*arg_info
, bool funcdef_flag
)
6755 tree arg_types
= arg_info
->types
;
6757 if (funcdef_flag
&& arg_info
->had_vla_unspec
)
6759 /* A function definition isn't function prototype scope C99 6.2.1p4. */
6761 error ("%<[*]%> not allowed in other than function prototype scope");
6764 if (arg_types
== 0 && !funcdef_flag
6765 && !in_system_header_at (input_location
))
6766 warning (OPT_Wstrict_prototypes
,
6767 "function declaration isn%'t a prototype");
6769 if (arg_types
== error_mark_node
)
6770 return 0; /* don't set TYPE_ARG_TYPES in this case */
6772 else if (arg_types
&& TREE_CODE (TREE_VALUE (arg_types
)) == IDENTIFIER_NODE
)
6776 pedwarn (input_location
, 0, "parameter names (without types) in function declaration");
6777 arg_info
->parms
= NULL_TREE
;
6780 arg_info
->parms
= arg_info
->types
;
6782 arg_info
->types
= 0;
6787 tree parm
, type
, typelt
;
6788 unsigned int parmno
;
6791 /* If there is a parameter of incomplete type in a definition,
6792 this is an error. In a declaration this is valid, and a
6793 struct or union type may be completed later, before any calls
6794 or definition of the function. In the case where the tag was
6795 first declared within the parameter list, a warning has
6796 already been given. If a parameter has void type, then
6797 however the function cannot be defined or called, so
6800 for (parm
= arg_info
->parms
, typelt
= arg_types
, parmno
= 1;
6802 parm
= DECL_CHAIN (parm
), typelt
= TREE_CHAIN (typelt
), parmno
++)
6804 type
= TREE_VALUE (typelt
);
6805 if (type
== error_mark_node
)
6808 if (!COMPLETE_TYPE_P (type
))
6812 if (DECL_NAME (parm
))
6813 error_at (input_location
,
6814 "parameter %u (%q+D) has incomplete type",
6817 error_at (DECL_SOURCE_LOCATION (parm
),
6818 "parameter %u has incomplete type",
6821 TREE_VALUE (typelt
) = error_mark_node
;
6822 TREE_TYPE (parm
) = error_mark_node
;
6823 arg_types
= NULL_TREE
;
6825 else if (VOID_TYPE_P (type
))
6827 if (DECL_NAME (parm
))
6828 warning_at (input_location
, 0,
6829 "parameter %u (%q+D) has void type",
6832 warning_at (DECL_SOURCE_LOCATION (parm
), 0,
6833 "parameter %u has void type",
6838 errmsg
= targetm
.invalid_parameter_type (type
);
6842 TREE_VALUE (typelt
) = error_mark_node
;
6843 TREE_TYPE (parm
) = error_mark_node
;
6844 arg_types
= NULL_TREE
;
6847 if (DECL_NAME (parm
) && TREE_USED (parm
))
6848 warn_if_shadowing (parm
);
6854 /* Allocate and initialize a c_arg_info structure from the parser's
6858 build_arg_info (void)
6860 struct c_arg_info
*ret
= XOBNEW (&parser_obstack
, struct c_arg_info
);
6861 ret
->parms
= NULL_TREE
;
6863 ret
->types
= NULL_TREE
;
6864 ret
->others
= NULL_TREE
;
6865 ret
->pending_sizes
= NULL
;
6866 ret
->had_vla_unspec
= 0;
6870 /* Take apart the current scope and return a c_arg_info structure with
6871 info on a parameter list just parsed.
6873 This structure is later fed to 'grokparms' and 'store_parm_decls'.
6875 ELLIPSIS being true means the argument list ended in '...' so don't
6876 append a sentinel (void_list_node) to the end of the type-list.
6878 EXPR is NULL or an expression that needs to be evaluated for the
6879 side effects of array size expressions in the parameters. */
6882 get_parm_info (bool ellipsis
, tree expr
)
6884 struct c_binding
*b
= current_scope
->bindings
;
6885 struct c_arg_info
*arg_info
= build_arg_info ();
6888 vec
<c_arg_tag
, va_gc
> *tags
= NULL
;
6892 bool gave_void_only_once_err
= false;
6894 arg_info
->had_vla_unspec
= current_scope
->had_vla_unspec
;
6896 /* The bindings in this scope must not get put into a block.
6897 We will take care of deleting the binding nodes. */
6898 current_scope
->bindings
= 0;
6900 /* This function is only called if there was *something* on the
6904 /* A parameter list consisting solely of 'void' indicates that the
6905 function takes no arguments. But if the 'void' is qualified
6906 (by 'const' or 'volatile'), or has a storage class specifier
6907 ('register'), then the behavior is undefined; issue an error.
6908 Typedefs for 'void' are OK (see DR#157). */
6909 if (b
->prev
== 0 /* one binding */
6910 && TREE_CODE (b
->decl
) == PARM_DECL
/* which is a parameter */
6911 && !DECL_NAME (b
->decl
) /* anonymous */
6912 && VOID_TYPE_P (TREE_TYPE (b
->decl
))) /* of void type */
6914 if (TYPE_QUALS (TREE_TYPE (b
->decl
)) != TYPE_UNQUALIFIED
6915 || C_DECL_REGISTER (b
->decl
))
6916 error ("%<void%> as only parameter may not be qualified");
6918 /* There cannot be an ellipsis. */
6920 error ("%<void%> must be the only parameter");
6922 arg_info
->types
= void_list_node
;
6927 types
= void_list_node
;
6929 /* Break up the bindings list into parms, tags, types, and others;
6930 apply sanity checks; purge the name-to-decl bindings. */
6933 tree decl
= b
->decl
;
6934 tree type
= TREE_TYPE (decl
);
6936 const char *keyword
;
6938 switch (TREE_CODE (decl
))
6943 gcc_assert (I_SYMBOL_BINDING (b
->id
) == b
);
6944 I_SYMBOL_BINDING (b
->id
) = b
->shadowed
;
6947 /* Check for forward decls that never got their actual decl. */
6948 if (TREE_ASM_WRITTEN (decl
))
6949 error ("parameter %q+D has just a forward declaration", decl
);
6950 /* Check for (..., void, ...) and issue an error. */
6951 else if (VOID_TYPE_P (type
) && !DECL_NAME (decl
))
6953 if (!gave_void_only_once_err
)
6955 error ("%<void%> must be the only parameter");
6956 gave_void_only_once_err
= true;
6961 /* Valid parameter, add it to the list. */
6962 DECL_CHAIN (decl
) = parms
;
6965 /* Since there is a prototype, args are passed in their
6966 declared types. The back end may override this later. */
6967 DECL_ARG_TYPE (decl
) = type
;
6968 types
= tree_cons (0, type
, types
);
6972 case ENUMERAL_TYPE
: keyword
= "enum"; goto tag
;
6973 case UNION_TYPE
: keyword
= "union"; goto tag
;
6974 case RECORD_TYPE
: keyword
= "struct"; goto tag
;
6976 /* Types may not have tag-names, in which case the type
6977 appears in the bindings list with b->id NULL. */
6980 gcc_assert (I_TAG_BINDING (b
->id
) == b
);
6981 I_TAG_BINDING (b
->id
) = b
->shadowed
;
6984 /* Warn about any struct, union or enum tags defined in a
6985 parameter list. The scope of such types is limited to
6986 the parameter list, which is rarely if ever desirable
6987 (it's impossible to call such a function with type-
6988 correct arguments). An anonymous union parm type is
6989 meaningful as a GNU extension, so don't warn for that. */
6990 if (TREE_CODE (decl
) != UNION_TYPE
|| b
->id
!= 0)
6993 /* The %s will be one of 'struct', 'union', or 'enum'. */
6994 warning_at (input_location
, 0,
6995 "%<%s %E%> declared inside parameter list"
6996 " will not be visible outside of this definition or"
6997 " declaration", keyword
, b
->id
);
6999 /* The %s will be one of 'struct', 'union', or 'enum'. */
7000 warning_at (input_location
, 0,
7001 "anonymous %s declared inside parameter list"
7002 " will not be visible outside of this definition or"
7003 " declaration", keyword
);
7008 vec_safe_push (tags
, tag
);
7014 /* CONST_DECLs appear here when we have an embedded enum,
7015 and TYPE_DECLs appear here when we have an embedded struct
7016 or union. No warnings for this - we already warned about the
7017 type itself. FUNCTION_DECLs appear when there is an implicit
7018 function declaration in the parameter list. */
7020 /* When we reinsert this decl in the function body, we need
7021 to reconstruct whether it was marked as nested. */
7022 gcc_assert (TREE_CODE (decl
) == FUNCTION_DECL
7025 DECL_CHAIN (decl
) = others
;
7030 /* error_mark_node appears here when we have an undeclared
7031 variable. Just throw it away. */
7034 gcc_assert (I_SYMBOL_BINDING (b
->id
) == b
);
7035 I_SYMBOL_BINDING (b
->id
) = b
->shadowed
;
7039 /* Other things that might be encountered. */
7046 b
= free_binding_and_advance (b
);
7049 arg_info
->parms
= parms
;
7050 arg_info
->tags
= tags
;
7051 arg_info
->types
= types
;
7052 arg_info
->others
= others
;
7053 arg_info
->pending_sizes
= expr
;
7057 /* Get the struct, enum or union (CODE says which) with tag NAME.
7058 Define the tag as a forward-reference with location LOC if it is
7059 not defined. Return a c_typespec structure for the type
7063 parser_xref_tag (location_t loc
, enum tree_code code
, tree name
)
7065 struct c_typespec ret
;
7069 ret
.expr
= NULL_TREE
;
7070 ret
.expr_const_operands
= true;
7072 /* If a cross reference is requested, look up the type
7073 already defined for this tag and return it. */
7075 ref
= lookup_tag (code
, name
, false, &refloc
);
7076 /* If this is the right type of tag, return what we found.
7077 (This reference will be shadowed by shadow_tag later if appropriate.)
7078 If this is the wrong type of tag, do not return it. If it was the
7079 wrong type in the same scope, we will have had an error
7080 message already; if in a different scope and declaring
7081 a name, pending_xref_error will give an error message; but if in a
7082 different scope and not declaring a name, this tag should
7083 shadow the previous declaration of a different type of tag, and
7084 this would not work properly if we return the reference found.
7085 (For example, with "struct foo" in an outer scope, "union foo;"
7086 must shadow that tag with a new one of union type.) */
7087 ret
.kind
= (ref
? ctsk_tagref
: ctsk_tagfirstref
);
7088 if (ref
&& TREE_CODE (ref
) == code
)
7090 if (C_TYPE_DEFINED_IN_STRUCT (ref
)
7091 && loc
!= UNKNOWN_LOCATION
7097 warning_at (loc
, OPT_Wc___compat
,
7098 ("enum type defined in struct or union "
7099 "is not visible in C++"));
7100 inform (refloc
, "enum type defined here");
7103 warning_at (loc
, OPT_Wc___compat
,
7104 ("struct defined in struct or union "
7105 "is not visible in C++"));
7106 inform (refloc
, "struct defined here");
7109 warning_at (loc
, OPT_Wc___compat
,
7110 ("union defined in struct or union "
7111 "is not visible in C++"));
7112 inform (refloc
, "union defined here");
7123 /* If no such tag is yet defined, create a forward-reference node
7124 and record it as the "definition".
7125 When a real declaration of this type is found,
7126 the forward-reference will be altered into a real type. */
7128 ref
= make_node (code
);
7129 if (code
== ENUMERAL_TYPE
)
7131 /* Give the type a default layout like unsigned int
7132 to avoid crashing if it does not get defined. */
7133 SET_TYPE_MODE (ref
, TYPE_MODE (unsigned_type_node
));
7134 TYPE_ALIGN (ref
) = TYPE_ALIGN (unsigned_type_node
);
7135 TYPE_USER_ALIGN (ref
) = 0;
7136 TYPE_UNSIGNED (ref
) = 1;
7137 TYPE_PRECISION (ref
) = TYPE_PRECISION (unsigned_type_node
);
7138 TYPE_MIN_VALUE (ref
) = TYPE_MIN_VALUE (unsigned_type_node
);
7139 TYPE_MAX_VALUE (ref
) = TYPE_MAX_VALUE (unsigned_type_node
);
7142 pushtag (loc
, name
, ref
);
7148 /* Get the struct, enum or union (CODE says which) with tag NAME.
7149 Define the tag as a forward-reference if it is not defined.
7150 Return a tree for the type. */
7153 xref_tag (enum tree_code code
, tree name
)
7155 return parser_xref_tag (input_location
, code
, name
).spec
;
7158 /* Make sure that the tag NAME is defined *in the current scope*
7159 at least as a forward reference.
7160 LOC is the location of the struct's definition.
7161 CODE says which kind of tag NAME ought to be.
7163 This stores the current value of the file static STRUCT_PARSE_INFO
7164 in *ENCLOSING_STRUCT_PARSE_INFO, and points STRUCT_PARSE_INFO at a
7165 new c_struct_parse_info structure. The old value of
7166 STRUCT_PARSE_INFO is restored in finish_struct. */
7169 start_struct (location_t loc
, enum tree_code code
, tree name
,
7170 struct c_struct_parse_info
**enclosing_struct_parse_info
)
7172 /* If there is already a tag defined at this scope
7173 (as a forward reference), just return it. */
7175 tree ref
= NULL_TREE
;
7176 location_t refloc
= UNKNOWN_LOCATION
;
7178 if (name
!= NULL_TREE
)
7179 ref
= lookup_tag (code
, name
, true, &refloc
);
7180 if (ref
&& TREE_CODE (ref
) == code
)
7182 if (TYPE_SIZE (ref
))
7184 if (code
== UNION_TYPE
)
7185 error_at (loc
, "redefinition of %<union %E%>", name
);
7187 error_at (loc
, "redefinition of %<struct %E%>", name
);
7188 if (refloc
!= UNKNOWN_LOCATION
)
7189 inform (refloc
, "originally defined here");
7190 /* Don't create structures using a name already in use. */
7193 else if (C_TYPE_BEING_DEFINED (ref
))
7195 if (code
== UNION_TYPE
)
7196 error_at (loc
, "nested redefinition of %<union %E%>", name
);
7198 error_at (loc
, "nested redefinition of %<struct %E%>", name
);
7199 /* Don't bother to report "originally defined here" for a
7200 nested redefinition; the original definition should be
7202 /* Don't create structures that contain themselves. */
7207 /* Otherwise create a forward-reference just so the tag is in scope. */
7209 if (ref
== NULL_TREE
|| TREE_CODE (ref
) != code
)
7211 ref
= make_node (code
);
7212 pushtag (loc
, name
, ref
);
7215 C_TYPE_BEING_DEFINED (ref
) = 1;
7216 TYPE_PACKED (ref
) = flag_pack_struct
;
7218 *enclosing_struct_parse_info
= struct_parse_info
;
7219 struct_parse_info
= XNEW (struct c_struct_parse_info
);
7220 struct_parse_info
->struct_types
.create (0);
7221 struct_parse_info
->fields
.create (0);
7222 struct_parse_info
->typedefs_seen
.create (0);
7224 /* FIXME: This will issue a warning for a use of a type defined
7225 within a statement expr used within sizeof, et. al. This is not
7226 terribly serious as C++ doesn't permit statement exprs within
7228 if (warn_cxx_compat
&& (in_sizeof
|| in_typeof
|| in_alignof
))
7229 warning_at (loc
, OPT_Wc___compat
,
7230 "defining type in %qs expression is invalid in C++",
7233 : (in_typeof
? "typeof" : "alignof")));
7238 /* Process the specs, declarator and width (NULL if omitted)
7239 of a structure component, returning a FIELD_DECL node.
7240 WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node.
7241 DECL_ATTRS is as for grokdeclarator.
7243 LOC is the location of the structure component.
7245 This is done during the parsing of the struct declaration.
7246 The FIELD_DECL nodes are chained together and the lot of them
7247 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
7250 grokfield (location_t loc
,
7251 struct c_declarator
*declarator
, struct c_declspecs
*declspecs
,
7252 tree width
, tree
*decl_attrs
)
7256 if (declarator
->kind
== cdk_id
&& declarator
->u
.id
== NULL_TREE
7257 && width
== NULL_TREE
)
7259 /* This is an unnamed decl.
7261 If we have something of the form "union { list } ;" then this
7262 is the anonymous union extension. Similarly for struct.
7264 If this is something of the form "struct foo;", then
7265 If MS or Plan 9 extensions are enabled, this is handled as
7266 an anonymous struct.
7267 Otherwise this is a forward declaration of a structure tag.
7269 If this is something of the form "foo;" and foo is a TYPE_DECL, then
7270 If foo names a structure or union without a tag, then this
7271 is an anonymous struct (this is permitted by C11).
7272 If MS or Plan 9 extensions are enabled and foo names a
7273 structure, then again this is an anonymous struct.
7274 Otherwise this is an error.
7276 Oh what a horrid tangled web we weave. I wonder if MS consciously
7277 took this from Plan 9 or if it was an accident of implementation
7278 that took root before someone noticed the bug... */
7280 tree type
= declspecs
->type
;
7281 bool type_ok
= RECORD_OR_UNION_TYPE_P (type
);
7285 && (flag_ms_extensions
7286 || flag_plan9_extensions
7287 || !declspecs
->typedef_p
))
7289 if (flag_ms_extensions
|| flag_plan9_extensions
)
7291 else if (TYPE_NAME (type
) == NULL
)
7298 pedwarn (loc
, 0, "declaration does not declare anything");
7302 pedwarn_c99 (loc
, OPT_Wpedantic
,
7303 "ISO C99 doesn%'t support unnamed structs/unions");
7305 pedwarn_c99 (loc
, OPT_Wpedantic
,
7306 "ISO C90 doesn%'t support unnamed structs/unions");
7309 value
= grokdeclarator (declarator
, declspecs
, FIELD
, false,
7310 width
? &width
: NULL
, decl_attrs
, NULL
, NULL
,
7313 finish_decl (value
, loc
, NULL_TREE
, NULL_TREE
, NULL_TREE
);
7314 DECL_INITIAL (value
) = width
;
7316 if (warn_cxx_compat
&& DECL_NAME (value
) != NULL_TREE
)
7318 /* If we currently have a binding for this field, set the
7319 in_struct field in the binding, so that we warn about lookups
7321 struct c_binding
*b
= I_SYMBOL_BINDING (DECL_NAME (value
));
7324 /* If the in_struct field is not yet set, push it on a list
7325 to be cleared when this struct is finished. */
7328 struct_parse_info
->fields
.safe_push (b
);
7337 /* Subroutine of detect_field_duplicates: return whether X and Y,
7338 which are both fields in the same struct, have duplicate field
7342 is_duplicate_field (tree x
, tree y
)
7344 if (DECL_NAME (x
) != NULL_TREE
&& DECL_NAME (x
) == DECL_NAME (y
))
7347 /* When using -fplan9-extensions, an anonymous field whose name is a
7348 typedef can duplicate a field name. */
7349 if (flag_plan9_extensions
7350 && (DECL_NAME (x
) == NULL_TREE
|| DECL_NAME (y
) == NULL_TREE
))
7352 tree xt
, xn
, yt
, yn
;
7355 if (DECL_NAME (x
) != NULL_TREE
)
7357 else if (RECORD_OR_UNION_TYPE_P (xt
)
7358 && TYPE_NAME (xt
) != NULL_TREE
7359 && TREE_CODE (TYPE_NAME (xt
)) == TYPE_DECL
)
7360 xn
= DECL_NAME (TYPE_NAME (xt
));
7365 if (DECL_NAME (y
) != NULL_TREE
)
7367 else if (RECORD_OR_UNION_TYPE_P (yt
)
7368 && TYPE_NAME (yt
) != NULL_TREE
7369 && TREE_CODE (TYPE_NAME (yt
)) == TYPE_DECL
)
7370 yn
= DECL_NAME (TYPE_NAME (yt
));
7374 if (xn
!= NULL_TREE
&& xn
== yn
)
7381 /* Subroutine of detect_field_duplicates: add the fields of FIELDLIST
7382 to HTAB, giving errors for any duplicates. */
7385 detect_field_duplicates_hash (tree fieldlist
,
7386 hash_table
<nofree_ptr_hash
<tree_node
> > *htab
)
7391 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
7392 if ((y
= DECL_NAME (x
)) != 0)
7394 slot
= htab
->find_slot (y
, INSERT
);
7397 error ("duplicate member %q+D", x
);
7398 DECL_NAME (x
) = NULL_TREE
;
7402 else if (RECORD_OR_UNION_TYPE_P (TREE_TYPE (x
)))
7404 detect_field_duplicates_hash (TYPE_FIELDS (TREE_TYPE (x
)), htab
);
7406 /* When using -fplan9-extensions, an anonymous field whose
7407 name is a typedef can duplicate a field name. */
7408 if (flag_plan9_extensions
7409 && TYPE_NAME (TREE_TYPE (x
)) != NULL_TREE
7410 && TREE_CODE (TYPE_NAME (TREE_TYPE (x
))) == TYPE_DECL
)
7412 tree xn
= DECL_NAME (TYPE_NAME (TREE_TYPE (x
)));
7413 slot
= htab
->find_slot (xn
, INSERT
);
7415 error ("duplicate member %q+D", TYPE_NAME (TREE_TYPE (x
)));
7421 /* Generate an error for any duplicate field names in FIELDLIST. Munge
7422 the list such that this does not present a problem later. */
7425 detect_field_duplicates (tree fieldlist
)
7430 /* If the struct is the list of instance variables of an Objective-C
7431 class, then we need to check all the instance variables of
7432 superclasses when checking for duplicates (since you can't have
7433 an instance variable in a subclass with the same name as an
7434 instance variable in a superclass). We pass on this job to the
7435 Objective-C compiler. objc_detect_field_duplicates() will return
7436 false if we are not checking the list of instance variables and
7437 the C frontend should proceed with the standard field duplicate
7438 checks. If we are checking the list of instance variables, the
7439 ObjC frontend will do the check, emit the errors if needed, and
7440 then return true. */
7441 if (c_dialect_objc ())
7442 if (objc_detect_field_duplicates (false))
7445 /* First, see if there are more than "a few" fields.
7446 This is trivially true if there are zero or one fields. */
7447 if (!fieldlist
|| !DECL_CHAIN (fieldlist
))
7452 if (DECL_NAME (x
) == NULL_TREE
7453 && RECORD_OR_UNION_TYPE_P (TREE_TYPE (x
)))
7456 } while (timeout
> 0 && x
);
7458 /* If there were "few" fields and no anonymous structures or unions,
7459 avoid the overhead of allocating a hash table. Instead just do
7460 the nested traversal thing. */
7463 for (x
= DECL_CHAIN (fieldlist
); x
; x
= DECL_CHAIN (x
))
7464 /* When using -fplan9-extensions, we can have duplicates
7465 between typedef names and fields. */
7467 || (flag_plan9_extensions
7468 && DECL_NAME (x
) == NULL_TREE
7469 && RECORD_OR_UNION_TYPE_P (TREE_TYPE (x
))
7470 && TYPE_NAME (TREE_TYPE (x
)) != NULL_TREE
7471 && TREE_CODE (TYPE_NAME (TREE_TYPE (x
))) == TYPE_DECL
))
7473 for (y
= fieldlist
; y
!= x
; y
= TREE_CHAIN (y
))
7474 if (is_duplicate_field (y
, x
))
7476 error ("duplicate member %q+D", x
);
7477 DECL_NAME (x
) = NULL_TREE
;
7483 hash_table
<nofree_ptr_hash
<tree_node
> > htab (37);
7484 detect_field_duplicates_hash (fieldlist
, &htab
);
7488 /* Finish up struct info used by -Wc++-compat. */
7491 warn_cxx_compat_finish_struct (tree fieldlist
, enum tree_code code
,
7492 location_t record_loc
)
7496 struct c_binding
*b
;
7498 if (fieldlist
== NULL_TREE
)
7500 if (code
== RECORD_TYPE
)
7501 warning_at (record_loc
, OPT_Wc___compat
,
7502 "empty struct has size 0 in C, size 1 in C++");
7504 warning_at (record_loc
, OPT_Wc___compat
,
7505 "empty union has size 0 in C, size 1 in C++");
7508 /* Set the C_TYPE_DEFINED_IN_STRUCT flag for each type defined in
7509 the current struct. We do this now at the end of the struct
7510 because the flag is used to issue visibility warnings, and we
7511 only want to issue those warnings if the type is referenced
7512 outside of the struct declaration. */
7513 FOR_EACH_VEC_ELT (struct_parse_info
->struct_types
, ix
, x
)
7514 C_TYPE_DEFINED_IN_STRUCT (x
) = 1;
7516 /* The TYPEDEFS_SEEN field of STRUCT_PARSE_INFO is a list of
7517 typedefs used when declaring fields in this struct. If the name
7518 of any of the fields is also a typedef name then the struct would
7519 not parse in C++, because the C++ lookup rules say that the
7520 typedef name would be looked up in the context of the struct, and
7521 would thus be the field rather than the typedef. */
7522 if (!struct_parse_info
->typedefs_seen
.is_empty ()
7523 && fieldlist
!= NULL_TREE
)
7525 /* Use a hash_set<tree> using the name of the typedef. We can use
7526 a hash_set<tree> because identifiers are interned. */
7527 hash_set
<tree
> tset
;
7529 FOR_EACH_VEC_ELT (struct_parse_info
->typedefs_seen
, ix
, x
)
7530 tset
.add (DECL_NAME (x
));
7532 for (x
= fieldlist
; x
!= NULL_TREE
; x
= DECL_CHAIN (x
))
7534 if (DECL_NAME (x
) != NULL_TREE
7535 && tset
.contains (DECL_NAME (x
)))
7537 warning_at (DECL_SOURCE_LOCATION (x
), OPT_Wc___compat
,
7538 ("using %qD as both field and typedef name is "
7541 /* FIXME: It would be nice to report the location where
7542 the typedef name is used. */
7547 /* For each field which has a binding and which was not defined in
7548 an enclosing struct, clear the in_struct field. */
7549 FOR_EACH_VEC_ELT (struct_parse_info
->fields
, ix
, b
)
7553 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
7554 LOC is the location of the RECORD_TYPE or UNION_TYPE's definition.
7555 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
7556 ATTRIBUTES are attributes to be applied to the structure.
7558 ENCLOSING_STRUCT_PARSE_INFO is the value of STRUCT_PARSE_INFO when
7559 the struct was started. */
7562 finish_struct (location_t loc
, tree t
, tree fieldlist
, tree attributes
,
7563 struct c_struct_parse_info
*enclosing_struct_parse_info
)
7566 bool toplevel
= file_scope
== current_scope
;
7567 int saw_named_field
;
7569 /* If this type was previously laid out as a forward reference,
7570 make sure we lay it out again. */
7574 decl_attributes (&t
, attributes
, (int) ATTR_FLAG_TYPE_IN_PLACE
);
7578 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
7580 if (DECL_NAME (x
) != 0)
7582 if (flag_isoc11
&& RECORD_OR_UNION_TYPE_P (TREE_TYPE (x
)))
7588 if (TREE_CODE (t
) == UNION_TYPE
)
7591 pedwarn (loc
, OPT_Wpedantic
, "union has no named members");
7593 pedwarn (loc
, OPT_Wpedantic
, "union has no members");
7598 pedwarn (loc
, OPT_Wpedantic
, "struct has no named members");
7600 pedwarn (loc
, OPT_Wpedantic
, "struct has no members");
7605 /* Install struct as DECL_CONTEXT of each field decl.
7606 Also process specified field sizes, found in the DECL_INITIAL,
7607 storing 0 there after the type has been changed to precision equal
7608 to its width, rather than the precision of the specified standard
7609 type. (Correct layout requires the original type to have been preserved
7612 saw_named_field
= 0;
7613 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
7615 if (TREE_TYPE (x
) == error_mark_node
)
7618 DECL_CONTEXT (x
) = t
;
7620 /* If any field is const, the structure type is pseudo-const. */
7621 if (TREE_READONLY (x
))
7622 C_TYPE_FIELDS_READONLY (t
) = 1;
7625 /* A field that is pseudo-const makes the structure likewise. */
7626 tree t1
= strip_array_types (TREE_TYPE (x
));
7627 if (RECORD_OR_UNION_TYPE_P (t1
) && C_TYPE_FIELDS_READONLY (t1
))
7628 C_TYPE_FIELDS_READONLY (t
) = 1;
7631 /* Any field that is volatile means variables of this type must be
7632 treated in some ways as volatile. */
7633 if (TREE_THIS_VOLATILE (x
))
7634 C_TYPE_FIELDS_VOLATILE (t
) = 1;
7636 /* Any field of nominal variable size implies structure is too. */
7637 if (C_DECL_VARIABLE_SIZE (x
))
7638 C_TYPE_VARIABLE_SIZE (t
) = 1;
7640 if (DECL_INITIAL (x
))
7642 unsigned HOST_WIDE_INT width
= tree_to_uhwi (DECL_INITIAL (x
));
7643 DECL_SIZE (x
) = bitsize_int (width
);
7644 DECL_BIT_FIELD (x
) = 1;
7645 SET_DECL_C_BIT_FIELD (x
);
7649 && (DECL_BIT_FIELD (x
)
7650 || TYPE_ALIGN (TREE_TYPE (x
)) > BITS_PER_UNIT
))
7651 DECL_PACKED (x
) = 1;
7653 /* Detect flexible array member in an invalid context. */
7654 if (TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
7655 && TYPE_SIZE (TREE_TYPE (x
)) == NULL_TREE
7656 && TYPE_DOMAIN (TREE_TYPE (x
)) != NULL_TREE
7657 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x
))) == NULL_TREE
)
7659 if (TREE_CODE (t
) == UNION_TYPE
)
7661 error_at (DECL_SOURCE_LOCATION (x
),
7662 "flexible array member in union");
7663 TREE_TYPE (x
) = error_mark_node
;
7665 else if (DECL_CHAIN (x
) != NULL_TREE
)
7667 error_at (DECL_SOURCE_LOCATION (x
),
7668 "flexible array member not at end of struct");
7669 TREE_TYPE (x
) = error_mark_node
;
7671 else if (!saw_named_field
)
7673 error_at (DECL_SOURCE_LOCATION (x
),
7674 "flexible array member in otherwise empty struct");
7675 TREE_TYPE (x
) = error_mark_node
;
7679 if (pedantic
&& TREE_CODE (t
) == RECORD_TYPE
7680 && flexible_array_type_p (TREE_TYPE (x
)))
7681 pedwarn (DECL_SOURCE_LOCATION (x
), OPT_Wpedantic
,
7682 "invalid use of structure with flexible array member");
7685 || RECORD_OR_UNION_TYPE_P (TREE_TYPE (x
)))
7686 saw_named_field
= 1;
7689 detect_field_duplicates (fieldlist
);
7691 /* Now we have the nearly final fieldlist. Record it,
7692 then lay out the structure or union (including the fields). */
7694 TYPE_FIELDS (t
) = fieldlist
;
7696 maybe_apply_pragma_scalar_storage_order (t
);
7700 if (TYPE_SIZE_UNIT (t
)
7701 && TREE_CODE (TYPE_SIZE_UNIT (t
)) == INTEGER_CST
7702 && !TREE_OVERFLOW (TYPE_SIZE_UNIT (t
))
7703 && !valid_constant_size_p (TYPE_SIZE_UNIT (t
)))
7704 error ("type %qT is too large", t
);
7706 /* Give bit-fields their proper types and rewrite the type of array fields
7707 with scalar component if the enclosing type has reverse storage order. */
7708 for (tree field
= fieldlist
; field
; field
= DECL_CHAIN (field
))
7710 if (TREE_CODE (field
) == FIELD_DECL
7711 && DECL_INITIAL (field
)
7712 && TREE_TYPE (field
) != error_mark_node
)
7714 unsigned HOST_WIDE_INT width
7715 = tree_to_uhwi (DECL_INITIAL (field
));
7716 tree type
= TREE_TYPE (field
);
7717 if (width
!= TYPE_PRECISION (type
))
7720 = c_build_bitfield_integer_type (width
, TYPE_UNSIGNED (type
));
7721 DECL_MODE (field
) = TYPE_MODE (TREE_TYPE (field
));
7723 DECL_INITIAL (field
) = 0;
7725 else if (TYPE_REVERSE_STORAGE_ORDER (t
)
7726 && TREE_CODE (field
) == FIELD_DECL
7727 && TREE_CODE (TREE_TYPE (field
)) == ARRAY_TYPE
)
7729 tree ftype
= TREE_TYPE (field
);
7730 tree ctype
= strip_array_types (ftype
);
7731 if (!RECORD_OR_UNION_TYPE_P (ctype
) && TYPE_MODE (ctype
) != QImode
)
7733 tree fmain_type
= TYPE_MAIN_VARIANT (ftype
);
7734 tree
*typep
= &fmain_type
;
7736 *typep
= build_distinct_type_copy (*typep
);
7737 TYPE_REVERSE_STORAGE_ORDER (*typep
) = 1;
7738 typep
= &TREE_TYPE (*typep
);
7739 } while (TREE_CODE (*typep
) == ARRAY_TYPE
);
7741 = c_build_qualified_type (fmain_type
, TYPE_QUALS (ftype
));
7746 /* Now we have the truly final field list.
7747 Store it in this type and in the variants. */
7749 TYPE_FIELDS (t
) = fieldlist
;
7751 /* If there are lots of fields, sort so we can look through them fast.
7752 We arbitrarily consider 16 or more elts to be "a lot". */
7757 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
7759 if (len
> 15 || DECL_NAME (x
) == NULL
)
7767 struct lang_type
*space
;
7768 struct sorted_fields_type
*space2
;
7770 len
+= list_length (x
);
7772 /* Use the same allocation policy here that make_node uses, to
7773 ensure that this lives as long as the rest of the struct decl.
7774 All decls in an inline function need to be saved. */
7776 space
= ggc_cleared_alloc
<struct lang_type
> ();
7777 space2
= (sorted_fields_type
*) ggc_internal_alloc
7778 (sizeof (struct sorted_fields_type
) + len
* sizeof (tree
));
7782 field_array
= &space2
->elts
[0];
7783 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
7785 field_array
[len
++] = x
;
7787 /* If there is anonymous struct or union, break out of the loop. */
7788 if (DECL_NAME (x
) == NULL
)
7791 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
7794 TYPE_LANG_SPECIFIC (t
) = space
;
7795 TYPE_LANG_SPECIFIC (t
)->s
->len
= len
;
7796 field_array
= TYPE_LANG_SPECIFIC (t
)->s
->elts
;
7797 qsort (field_array
, len
, sizeof (tree
), field_decl_cmp
);
7802 for (x
= TYPE_MAIN_VARIANT (t
); x
; x
= TYPE_NEXT_VARIANT (x
))
7804 TYPE_FIELDS (x
) = TYPE_FIELDS (t
);
7805 TYPE_LANG_SPECIFIC (x
) = TYPE_LANG_SPECIFIC (t
);
7806 C_TYPE_FIELDS_READONLY (x
) = C_TYPE_FIELDS_READONLY (t
);
7807 C_TYPE_FIELDS_VOLATILE (x
) = C_TYPE_FIELDS_VOLATILE (t
);
7808 C_TYPE_VARIABLE_SIZE (x
) = C_TYPE_VARIABLE_SIZE (t
);
7811 /* If this was supposed to be a transparent union, but we can't
7812 make it one, warn and turn off the flag. */
7813 if (TREE_CODE (t
) == UNION_TYPE
7814 && TYPE_TRANSPARENT_AGGR (t
)
7815 && (!TYPE_FIELDS (t
) || TYPE_MODE (t
) != DECL_MODE (TYPE_FIELDS (t
))))
7817 TYPE_TRANSPARENT_AGGR (t
) = 0;
7818 warning_at (loc
, 0, "union cannot be made transparent");
7821 /* If this structure or union completes the type of any previous
7822 variable declaration, lay it out and output its rtl.
7824 Note: C_TYPE_INCOMPLETE_VARS overloads TYPE_VFIELD which is used
7825 in dwarf2out via rest_of_decl_compilation below and means
7826 something totally different. Since we will be clearing
7827 C_TYPE_INCOMPLETE_VARS shortly after we iterate through them,
7828 clear it ahead of time and avoid problems in dwarf2out. Ideally,
7829 C_TYPE_INCOMPLETE_VARS should use some language specific
7831 tree incomplete_vars
= C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t
));
7832 C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t
)) = 0;
7833 for (x
= incomplete_vars
; x
; x
= TREE_CHAIN (x
))
7835 tree decl
= TREE_VALUE (x
);
7836 if (TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
)
7837 layout_array_type (TREE_TYPE (decl
));
7838 if (TREE_CODE (decl
) != TYPE_DECL
)
7840 layout_decl (decl
, 0);
7841 if (c_dialect_objc ())
7842 objc_check_decl (decl
);
7843 rest_of_decl_compilation (decl
, toplevel
, 0);
7847 /* Update type location to the one of the definition, instead of e.g.
7848 a forward declaration. */
7849 if (TYPE_STUB_DECL (t
))
7850 DECL_SOURCE_LOCATION (TYPE_STUB_DECL (t
)) = loc
;
7852 /* Finish debugging output for this type. */
7853 rest_of_type_compilation (t
, toplevel
);
7855 /* If we're inside a function proper, i.e. not file-scope and not still
7856 parsing parameters, then arrange for the size of a variable sized type
7858 if (building_stmt_list_p () && variably_modified_type_p (t
, NULL_TREE
))
7859 add_stmt (build_stmt (loc
,
7860 DECL_EXPR
, build_decl (loc
, TYPE_DECL
, NULL
, t
)));
7862 if (warn_cxx_compat
)
7863 warn_cxx_compat_finish_struct (fieldlist
, TREE_CODE (t
), loc
);
7865 struct_parse_info
->struct_types
.release ();
7866 struct_parse_info
->fields
.release ();
7867 struct_parse_info
->typedefs_seen
.release ();
7868 XDELETE (struct_parse_info
);
7870 struct_parse_info
= enclosing_struct_parse_info
;
7872 /* If this struct is defined inside a struct, add it to
7875 && struct_parse_info
!= NULL
7876 && !in_sizeof
&& !in_typeof
&& !in_alignof
)
7877 struct_parse_info
->struct_types
.safe_push (t
);
7882 /* Lay out the type T, and its element type, and so on. */
7885 layout_array_type (tree t
)
7887 if (TREE_CODE (TREE_TYPE (t
)) == ARRAY_TYPE
)
7888 layout_array_type (TREE_TYPE (t
));
7892 /* Begin compiling the definition of an enumeration type.
7893 NAME is its name (or null if anonymous).
7894 LOC is the enum's location.
7895 Returns the type object, as yet incomplete.
7896 Also records info about it so that build_enumerator
7897 may be used to declare the individual values as they are read. */
7900 start_enum (location_t loc
, struct c_enum_contents
*the_enum
, tree name
)
7902 tree enumtype
= NULL_TREE
;
7903 location_t enumloc
= UNKNOWN_LOCATION
;
7905 /* If this is the real definition for a previous forward reference,
7906 fill in the contents in the same object that used to be the
7907 forward reference. */
7909 if (name
!= NULL_TREE
)
7910 enumtype
= lookup_tag (ENUMERAL_TYPE
, name
, true, &enumloc
);
7912 if (enumtype
== NULL_TREE
|| TREE_CODE (enumtype
) != ENUMERAL_TYPE
)
7914 enumtype
= make_node (ENUMERAL_TYPE
);
7915 pushtag (loc
, name
, enumtype
);
7918 if (C_TYPE_BEING_DEFINED (enumtype
))
7919 error_at (loc
, "nested redefinition of %<enum %E%>", name
);
7921 C_TYPE_BEING_DEFINED (enumtype
) = 1;
7923 if (TYPE_VALUES (enumtype
) != 0)
7925 /* This enum is a named one that has been declared already. */
7926 error_at (loc
, "redeclaration of %<enum %E%>", name
);
7927 if (enumloc
!= UNKNOWN_LOCATION
)
7928 inform (enumloc
, "originally defined here");
7930 /* Completely replace its old definition.
7931 The old enumerators remain defined, however. */
7932 TYPE_VALUES (enumtype
) = 0;
7935 the_enum
->enum_next_value
= integer_zero_node
;
7936 the_enum
->enum_overflow
= 0;
7938 if (flag_short_enums
)
7939 for (tree v
= TYPE_MAIN_VARIANT (enumtype
); v
; v
= TYPE_NEXT_VARIANT (v
))
7940 TYPE_PACKED (v
) = 1;
7942 /* FIXME: This will issue a warning for a use of a type defined
7943 within sizeof in a statement expr. This is not terribly serious
7944 as C++ doesn't permit statement exprs within sizeof anyhow. */
7945 if (warn_cxx_compat
&& (in_sizeof
|| in_typeof
|| in_alignof
))
7946 warning_at (loc
, OPT_Wc___compat
,
7947 "defining type in %qs expression is invalid in C++",
7950 : (in_typeof
? "typeof" : "alignof")));
7955 /* After processing and defining all the values of an enumeration type,
7956 install their decls in the enumeration type and finish it off.
7957 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
7958 and ATTRIBUTES are the specified attributes.
7959 Returns ENUMTYPE. */
7962 finish_enum (tree enumtype
, tree values
, tree attributes
)
7965 tree minnode
= 0, maxnode
= 0;
7968 bool toplevel
= (file_scope
== current_scope
);
7969 struct lang_type
*lt
;
7971 decl_attributes (&enumtype
, attributes
, (int) ATTR_FLAG_TYPE_IN_PLACE
);
7973 /* Calculate the maximum value of any enumerator in this type. */
7975 if (values
== error_mark_node
)
7976 minnode
= maxnode
= integer_zero_node
;
7979 minnode
= maxnode
= TREE_VALUE (values
);
7980 for (pair
= TREE_CHAIN (values
); pair
; pair
= TREE_CHAIN (pair
))
7982 tree value
= TREE_VALUE (pair
);
7983 if (tree_int_cst_lt (maxnode
, value
))
7985 if (tree_int_cst_lt (value
, minnode
))
7990 /* Construct the final type of this enumeration. It is the same
7991 as one of the integral types - the narrowest one that fits, except
7992 that normally we only go as narrow as int - and signed iff any of
7993 the values are negative. */
7994 sign
= (tree_int_cst_sgn (minnode
) >= 0) ? UNSIGNED
: SIGNED
;
7995 precision
= MAX (tree_int_cst_min_precision (minnode
, sign
),
7996 tree_int_cst_min_precision (maxnode
, sign
));
7998 if (TYPE_PACKED (enumtype
) || precision
> TYPE_PRECISION (integer_type_node
))
8000 tem
= c_common_type_for_size (precision
, sign
== UNSIGNED
? 1 : 0);
8003 warning (0, "enumeration values exceed range of largest integer");
8004 tem
= long_long_integer_type_node
;
8008 tem
= sign
== UNSIGNED
? unsigned_type_node
: integer_type_node
;
8010 TYPE_MIN_VALUE (enumtype
) = TYPE_MIN_VALUE (tem
);
8011 TYPE_MAX_VALUE (enumtype
) = TYPE_MAX_VALUE (tem
);
8012 TYPE_UNSIGNED (enumtype
) = TYPE_UNSIGNED (tem
);
8013 TYPE_ALIGN (enumtype
) = TYPE_ALIGN (tem
);
8014 TYPE_SIZE (enumtype
) = 0;
8016 /* If the precision of the type was specified with an attribute and it
8017 was too small, give an error. Otherwise, use it. */
8018 if (TYPE_PRECISION (enumtype
)
8019 && lookup_attribute ("mode", attributes
))
8021 if (precision
> TYPE_PRECISION (enumtype
))
8022 error ("specified mode too small for enumeral values");
8025 TYPE_PRECISION (enumtype
) = TYPE_PRECISION (tem
);
8027 layout_type (enumtype
);
8029 if (values
!= error_mark_node
)
8031 /* Change the type of the enumerators to be the enum type. We
8032 need to do this irrespective of the size of the enum, for
8033 proper type checking. Replace the DECL_INITIALs of the
8034 enumerators, and the value slots of the list, with copies
8035 that have the enum type; they cannot be modified in place
8036 because they may be shared (e.g. integer_zero_node) Finally,
8037 change the purpose slots to point to the names of the decls. */
8038 for (pair
= values
; pair
; pair
= TREE_CHAIN (pair
))
8040 tree enu
= TREE_PURPOSE (pair
);
8041 tree ini
= DECL_INITIAL (enu
);
8043 TREE_TYPE (enu
) = enumtype
;
8045 /* The ISO C Standard mandates enumerators to have type int,
8046 even though the underlying type of an enum type is
8047 unspecified. However, GCC allows enumerators of any
8048 integer type as an extensions. build_enumerator()
8049 converts any enumerators that fit in an int to type int,
8050 to avoid promotions to unsigned types when comparing
8051 integers with enumerators that fit in the int range.
8052 When -pedantic is given, build_enumerator() would have
8053 already warned about those that don't fit. Here we
8054 convert the rest to the enumerator type. */
8055 if (TREE_TYPE (ini
) != integer_type_node
)
8056 ini
= convert (enumtype
, ini
);
8058 DECL_INITIAL (enu
) = ini
;
8059 TREE_PURPOSE (pair
) = DECL_NAME (enu
);
8060 TREE_VALUE (pair
) = ini
;
8063 TYPE_VALUES (enumtype
) = values
;
8066 /* Record the min/max values so that we can warn about bit-field
8067 enumerations that are too small for the values. */
8068 lt
= ggc_cleared_alloc
<struct lang_type
> ();
8069 lt
->enum_min
= minnode
;
8070 lt
->enum_max
= maxnode
;
8071 TYPE_LANG_SPECIFIC (enumtype
) = lt
;
8073 /* Fix up all variant types of this enum type. */
8074 for (tem
= TYPE_MAIN_VARIANT (enumtype
); tem
; tem
= TYPE_NEXT_VARIANT (tem
))
8076 if (tem
== enumtype
)
8078 TYPE_VALUES (tem
) = TYPE_VALUES (enumtype
);
8079 TYPE_MIN_VALUE (tem
) = TYPE_MIN_VALUE (enumtype
);
8080 TYPE_MAX_VALUE (tem
) = TYPE_MAX_VALUE (enumtype
);
8081 TYPE_SIZE (tem
) = TYPE_SIZE (enumtype
);
8082 TYPE_SIZE_UNIT (tem
) = TYPE_SIZE_UNIT (enumtype
);
8083 SET_TYPE_MODE (tem
, TYPE_MODE (enumtype
));
8084 TYPE_PRECISION (tem
) = TYPE_PRECISION (enumtype
);
8085 TYPE_ALIGN (tem
) = TYPE_ALIGN (enumtype
);
8086 TYPE_USER_ALIGN (tem
) = TYPE_USER_ALIGN (enumtype
);
8087 TYPE_UNSIGNED (tem
) = TYPE_UNSIGNED (enumtype
);
8088 TYPE_LANG_SPECIFIC (tem
) = TYPE_LANG_SPECIFIC (enumtype
);
8091 /* Finish debugging output for this type. */
8092 rest_of_type_compilation (enumtype
, toplevel
);
8094 /* If this enum is defined inside a struct, add it to
8097 && struct_parse_info
!= NULL
8098 && !in_sizeof
&& !in_typeof
&& !in_alignof
)
8099 struct_parse_info
->struct_types
.safe_push (enumtype
);
8104 /* Build and install a CONST_DECL for one value of the
8105 current enumeration type (one that was begun with start_enum).
8106 DECL_LOC is the location of the enumerator.
8107 LOC is the location of the '=' operator if any, DECL_LOC otherwise.
8108 Return a tree-list containing the CONST_DECL and its value.
8109 Assignment of sequential values by default is handled here. */
8112 build_enumerator (location_t decl_loc
, location_t loc
,
8113 struct c_enum_contents
*the_enum
, tree name
, tree value
)
8117 /* Validate and default VALUE. */
8121 /* Don't issue more errors for error_mark_node (i.e. an
8122 undeclared identifier) - just ignore the value expression. */
8123 if (value
== error_mark_node
)
8125 else if (!INTEGRAL_TYPE_P (TREE_TYPE (value
)))
8127 error_at (loc
, "enumerator value for %qE is not an integer constant",
8133 if (TREE_CODE (value
) != INTEGER_CST
)
8135 value
= c_fully_fold (value
, false, NULL
);
8136 if (TREE_CODE (value
) == INTEGER_CST
)
8137 pedwarn (loc
, OPT_Wpedantic
,
8138 "enumerator value for %qE is not an integer "
8139 "constant expression", name
);
8141 if (TREE_CODE (value
) != INTEGER_CST
)
8143 error ("enumerator value for %qE is not an integer constant",
8149 value
= default_conversion (value
);
8150 constant_expression_warning (value
);
8155 /* Default based on previous value. */
8156 /* It should no longer be possible to have NON_LVALUE_EXPR
8160 value
= the_enum
->enum_next_value
;
8161 if (the_enum
->enum_overflow
)
8162 error_at (loc
, "overflow in enumeration values");
8164 /* Even though the underlying type of an enum is unspecified, the
8165 type of enumeration constants is explicitly defined as int
8166 (6.4.4.3/2 in the C99 Standard). GCC allows any integer type as
8168 else if (!int_fits_type_p (value
, integer_type_node
))
8169 pedwarn (loc
, OPT_Wpedantic
,
8170 "ISO C restricts enumerator values to range of %<int%>");
8172 /* The ISO C Standard mandates enumerators to have type int, even
8173 though the underlying type of an enum type is unspecified.
8174 However, GCC allows enumerators of any integer type as an
8175 extensions. Here we convert any enumerators that fit in an int
8176 to type int, to avoid promotions to unsigned types when comparing
8177 integers with enumerators that fit in the int range. When
8178 -pedantic is given, we would have already warned about those that
8179 don't fit. We have to do this here rather than in finish_enum
8180 because this value may be used to define more enumerators. */
8181 if (int_fits_type_p (value
, integer_type_node
))
8182 value
= convert (integer_type_node
, value
);
8184 /* Set basis for default for next value. */
8185 the_enum
->enum_next_value
8186 = build_binary_op (EXPR_LOC_OR_LOC (value
, input_location
),
8187 PLUS_EXPR
, value
, integer_one_node
, 0);
8188 the_enum
->enum_overflow
= tree_int_cst_lt (the_enum
->enum_next_value
, value
);
8190 /* Now create a declaration for the enum value name. */
8192 type
= TREE_TYPE (value
);
8193 type
= c_common_type_for_size (MAX (TYPE_PRECISION (type
),
8194 TYPE_PRECISION (integer_type_node
)),
8195 (TYPE_PRECISION (type
)
8196 >= TYPE_PRECISION (integer_type_node
)
8197 && TYPE_UNSIGNED (type
)));
8199 decl
= build_decl (decl_loc
, CONST_DECL
, name
, type
);
8200 DECL_INITIAL (decl
) = convert (type
, value
);
8203 return tree_cons (decl
, value
, NULL_TREE
);
8207 /* Create the FUNCTION_DECL for a function definition.
8208 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
8209 the declaration; they describe the function's name and the type it returns,
8210 but twisted together in a fashion that parallels the syntax of C.
8212 This function creates a binding context for the function body
8213 as well as setting up the FUNCTION_DECL in current_function_decl.
8215 Returns 1 on success. If the DECLARATOR is not suitable for a function
8216 (it defines a datum instead), we return 0, which tells
8217 yyparse to report a parse error. */
8220 start_function (struct c_declspecs
*declspecs
, struct c_declarator
*declarator
,
8223 tree decl1
, old_decl
;
8224 tree restype
, resdecl
;
8227 current_function_returns_value
= 0; /* Assume, until we see it does. */
8228 current_function_returns_null
= 0;
8229 current_function_returns_abnormally
= 0;
8230 warn_about_return_type
= 0;
8231 c_switch_stack
= NULL
;
8233 /* Indicate no valid break/continue context by setting these variables
8234 to some non-null, non-label value. We'll notice and emit the proper
8235 error message in c_finish_bc_stmt. */
8236 c_break_label
= c_cont_label
= size_zero_node
;
8238 decl1
= grokdeclarator (declarator
, declspecs
, FUNCDEF
, true, NULL
,
8239 &attributes
, NULL
, NULL
, DEPRECATED_NORMAL
);
8240 invoke_plugin_callbacks (PLUGIN_START_PARSE_FUNCTION
, decl1
);
8242 /* If the declarator is not suitable for a function definition,
8243 cause a syntax error. */
8245 || TREE_CODE (decl1
) != FUNCTION_DECL
)
8248 loc
= DECL_SOURCE_LOCATION (decl1
);
8250 c_decl_attributes (&decl1
, attributes
, 0);
8252 if (DECL_DECLARED_INLINE_P (decl1
)
8253 && DECL_UNINLINABLE (decl1
)
8254 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1
)))
8255 warning_at (loc
, OPT_Wattributes
,
8256 "inline function %qD given attribute noinline",
8259 /* Handle gnu_inline attribute. */
8260 if (declspecs
->inline_p
8261 && !flag_gnu89_inline
8262 && TREE_CODE (decl1
) == FUNCTION_DECL
8263 && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl1
))
8264 || current_function_decl
))
8266 if (declspecs
->storage_class
!= csc_static
)
8267 DECL_EXTERNAL (decl1
) = !DECL_EXTERNAL (decl1
);
8270 announce_function (decl1
);
8272 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1
))))
8274 error_at (loc
, "return type is an incomplete type");
8275 /* Make it return void instead. */
8277 = build_function_type (void_type_node
,
8278 TYPE_ARG_TYPES (TREE_TYPE (decl1
)));
8281 if (warn_about_return_type
)
8282 warn_defaults_to (loc
, flag_isoc99
? OPT_Wimplicit_int
8283 : (warn_return_type
? OPT_Wreturn_type
8284 : OPT_Wimplicit_int
),
8285 "return type defaults to %<int%>");
8287 /* Make the init_value nonzero so pushdecl knows this is not tentative.
8288 error_mark_node is replaced below (in pop_scope) with the BLOCK. */
8289 DECL_INITIAL (decl1
) = error_mark_node
;
8291 /* A nested function is not global. */
8292 if (current_function_decl
!= 0)
8293 TREE_PUBLIC (decl1
) = 0;
8295 /* If this definition isn't a prototype and we had a prototype declaration
8296 before, copy the arg type info from that prototype. */
8297 old_decl
= lookup_name_in_scope (DECL_NAME (decl1
), current_scope
);
8298 if (old_decl
&& TREE_CODE (old_decl
) != FUNCTION_DECL
)
8300 current_function_prototype_locus
= UNKNOWN_LOCATION
;
8301 current_function_prototype_built_in
= false;
8302 current_function_prototype_arg_types
= NULL_TREE
;
8303 if (!prototype_p (TREE_TYPE (decl1
)))
8305 if (old_decl
!= 0 && TREE_CODE (TREE_TYPE (old_decl
)) == FUNCTION_TYPE
8306 && comptypes (TREE_TYPE (TREE_TYPE (decl1
)),
8307 TREE_TYPE (TREE_TYPE (old_decl
))))
8309 if (stdarg_p (TREE_TYPE (old_decl
)))
8311 warning_at (loc
, 0, "%q+D defined as variadic function "
8312 "without prototype", decl1
);
8313 locate_old_decl (old_decl
);
8315 TREE_TYPE (decl1
) = composite_type (TREE_TYPE (old_decl
),
8317 current_function_prototype_locus
= DECL_SOURCE_LOCATION (old_decl
);
8318 current_function_prototype_built_in
8319 = C_DECL_BUILTIN_PROTOTYPE (old_decl
);
8320 current_function_prototype_arg_types
8321 = TYPE_ARG_TYPES (TREE_TYPE (decl1
));
8323 if (TREE_PUBLIC (decl1
))
8325 /* If there is an external prototype declaration of this
8326 function, record its location but do not copy information
8327 to this decl. This may be an invisible declaration
8328 (built-in or in a scope which has finished) or simply
8329 have more refined argument types than any declaration
8331 struct c_binding
*b
;
8332 for (b
= I_SYMBOL_BINDING (DECL_NAME (decl1
)); b
; b
= b
->shadowed
)
8333 if (B_IN_SCOPE (b
, external_scope
))
8337 tree ext_decl
, ext_type
;
8339 ext_type
= b
->u
.type
? b
->u
.type
: TREE_TYPE (ext_decl
);
8340 if (TREE_CODE (ext_type
) == FUNCTION_TYPE
8341 && comptypes (TREE_TYPE (TREE_TYPE (decl1
)),
8342 TREE_TYPE (ext_type
)))
8344 current_function_prototype_locus
8345 = DECL_SOURCE_LOCATION (ext_decl
);
8346 current_function_prototype_built_in
8347 = C_DECL_BUILTIN_PROTOTYPE (ext_decl
);
8348 current_function_prototype_arg_types
8349 = TYPE_ARG_TYPES (ext_type
);
8355 /* Optionally warn of old-fashioned def with no previous prototype. */
8356 if (warn_strict_prototypes
8357 && old_decl
!= error_mark_node
8358 && !prototype_p (TREE_TYPE (decl1
))
8359 && C_DECL_ISNT_PROTOTYPE (old_decl
))
8360 warning_at (loc
, OPT_Wstrict_prototypes
,
8361 "function declaration isn%'t a prototype");
8362 /* Optionally warn of any global def with no previous prototype. */
8363 else if (warn_missing_prototypes
8364 && old_decl
!= error_mark_node
8365 && TREE_PUBLIC (decl1
)
8366 && !MAIN_NAME_P (DECL_NAME (decl1
))
8367 && C_DECL_ISNT_PROTOTYPE (old_decl
)
8368 && !DECL_DECLARED_INLINE_P (decl1
))
8369 warning_at (loc
, OPT_Wmissing_prototypes
,
8370 "no previous prototype for %qD", decl1
);
8371 /* Optionally warn of any def with no previous prototype
8372 if the function has already been used. */
8373 else if (warn_missing_prototypes
8375 && old_decl
!= error_mark_node
8376 && TREE_USED (old_decl
)
8377 && !prototype_p (TREE_TYPE (old_decl
)))
8378 warning_at (loc
, OPT_Wmissing_prototypes
,
8379 "%qD was used with no prototype before its definition", decl1
);
8380 /* Optionally warn of any global def with no previous declaration. */
8381 else if (warn_missing_declarations
8382 && TREE_PUBLIC (decl1
)
8384 && !MAIN_NAME_P (DECL_NAME (decl1
))
8385 && !DECL_DECLARED_INLINE_P (decl1
))
8386 warning_at (loc
, OPT_Wmissing_declarations
,
8387 "no previous declaration for %qD",
8389 /* Optionally warn of any def with no previous declaration
8390 if the function has already been used. */
8391 else if (warn_missing_declarations
8393 && old_decl
!= error_mark_node
8394 && TREE_USED (old_decl
)
8395 && C_DECL_IMPLICIT (old_decl
))
8396 warning_at (loc
, OPT_Wmissing_declarations
,
8397 "%qD was used with no declaration before its definition", decl1
);
8399 /* This function exists in static storage.
8400 (This does not mean `static' in the C sense!) */
8401 TREE_STATIC (decl1
) = 1;
8403 /* This is the earliest point at which we might know the assembler
8404 name of the function. Thus, if it's set before this, die horribly. */
8405 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl1
));
8407 /* If #pragma weak was used, mark the decl weak now. */
8408 if (current_scope
== file_scope
)
8409 maybe_apply_pragma_weak (decl1
);
8411 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
8412 if (warn_main
&& MAIN_NAME_P (DECL_NAME (decl1
)))
8414 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1
)))
8415 != integer_type_node
)
8416 pedwarn (loc
, OPT_Wmain
, "return type of %qD is not %<int%>", decl1
);
8417 else if (TYPE_ATOMIC (TREE_TYPE (TREE_TYPE (decl1
))))
8418 pedwarn (loc
, OPT_Wmain
, "%<_Atomic%>-qualified return type of %qD",
8421 check_main_parameter_types (decl1
);
8423 if (!TREE_PUBLIC (decl1
))
8424 pedwarn (loc
, OPT_Wmain
,
8425 "%qD is normally a non-static function", decl1
);
8428 /* Record the decl so that the function name is defined.
8429 If we already have a decl for this name, and it is a FUNCTION_DECL,
8430 use the old decl. */
8432 current_function_decl
= pushdecl (decl1
);
8435 declare_parm_level ();
8437 restype
= TREE_TYPE (TREE_TYPE (current_function_decl
));
8438 resdecl
= build_decl (loc
, RESULT_DECL
, NULL_TREE
, restype
);
8439 DECL_ARTIFICIAL (resdecl
) = 1;
8440 DECL_IGNORED_P (resdecl
) = 1;
8441 DECL_RESULT (current_function_decl
) = resdecl
;
8443 start_fname_decls ();
8448 /* Subroutine of store_parm_decls which handles new-style function
8449 definitions (prototype format). The parms already have decls, so we
8450 need only record them as in effect and complain if any redundant
8451 old-style parm decls were written. */
8453 store_parm_decls_newstyle (tree fndecl
, const struct c_arg_info
*arg_info
)
8459 if (current_scope
->bindings
)
8461 error_at (DECL_SOURCE_LOCATION (fndecl
),
8462 "old-style parameter declarations in prototyped "
8463 "function definition");
8465 /* Get rid of the old-style declarations. */
8469 /* Don't issue this warning for nested functions, and don't issue this
8470 warning if we got here because ARG_INFO_TYPES was error_mark_node
8471 (this happens when a function definition has just an ellipsis in
8472 its parameter list). */
8473 else if (!in_system_header_at (input_location
)
8474 && !current_function_scope
8475 && arg_info
->types
!= error_mark_node
)
8476 warning_at (DECL_SOURCE_LOCATION (fndecl
), OPT_Wtraditional
,
8477 "traditional C rejects ISO C style function definitions");
8479 /* Now make all the parameter declarations visible in the function body.
8480 We can bypass most of the grunt work of pushdecl. */
8481 for (decl
= arg_info
->parms
; decl
; decl
= DECL_CHAIN (decl
))
8483 DECL_CONTEXT (decl
) = current_function_decl
;
8484 if (DECL_NAME (decl
))
8486 bind (DECL_NAME (decl
), decl
, current_scope
,
8487 /*invisible=*/false, /*nested=*/false,
8489 if (!TREE_USED (decl
))
8490 warn_if_shadowing (decl
);
8493 error_at (DECL_SOURCE_LOCATION (decl
), "parameter name omitted");
8496 /* Record the parameter list in the function declaration. */
8497 DECL_ARGUMENTS (fndecl
) = arg_info
->parms
;
8499 /* Now make all the ancillary declarations visible, likewise. */
8500 for (decl
= arg_info
->others
; decl
; decl
= DECL_CHAIN (decl
))
8502 DECL_CONTEXT (decl
) = current_function_decl
;
8503 if (DECL_NAME (decl
))
8504 bind (DECL_NAME (decl
), decl
, current_scope
,
8505 /*invisible=*/false,
8506 /*nested=*/(TREE_CODE (decl
) == FUNCTION_DECL
),
8510 /* And all the tag declarations. */
8511 FOR_EACH_VEC_SAFE_ELT_REVERSE (arg_info
->tags
, ix
, tag
)
8513 bind (tag
->id
, tag
->type
, current_scope
,
8514 /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION
);
8517 /* Subroutine of store_parm_decls which handles old-style function
8518 definitions (separate parameter list and declarations). */
8521 store_parm_decls_oldstyle (tree fndecl
, const struct c_arg_info
*arg_info
)
8523 struct c_binding
*b
;
8524 tree parm
, decl
, last
;
8525 tree parmids
= arg_info
->parms
;
8526 hash_set
<tree
> seen_args
;
8528 if (!in_system_header_at (input_location
))
8529 warning_at (DECL_SOURCE_LOCATION (fndecl
),
8530 OPT_Wold_style_definition
, "old-style function definition");
8532 /* Match each formal parameter name with its declaration. Save each
8533 decl in the appropriate TREE_PURPOSE slot of the parmids chain. */
8534 for (parm
= parmids
; parm
; parm
= TREE_CHAIN (parm
))
8536 if (TREE_VALUE (parm
) == 0)
8538 error_at (DECL_SOURCE_LOCATION (fndecl
),
8539 "parameter name missing from parameter list");
8540 TREE_PURPOSE (parm
) = 0;
8544 b
= I_SYMBOL_BINDING (TREE_VALUE (parm
));
8545 if (b
&& B_IN_CURRENT_SCOPE (b
))
8548 /* Skip erroneous parameters. */
8549 if (decl
== error_mark_node
)
8551 /* If we got something other than a PARM_DECL it is an error. */
8552 if (TREE_CODE (decl
) != PARM_DECL
)
8553 error_at (DECL_SOURCE_LOCATION (decl
),
8554 "%qD declared as a non-parameter", decl
);
8555 /* If the declaration is already marked, we have a duplicate
8556 name. Complain and ignore the duplicate. */
8557 else if (seen_args
.contains (decl
))
8559 error_at (DECL_SOURCE_LOCATION (decl
),
8560 "multiple parameters named %qD", decl
);
8561 TREE_PURPOSE (parm
) = 0;
8564 /* If the declaration says "void", complain and turn it into
8566 else if (VOID_TYPE_P (TREE_TYPE (decl
)))
8568 error_at (DECL_SOURCE_LOCATION (decl
),
8569 "parameter %qD declared with void type", decl
);
8570 TREE_TYPE (decl
) = integer_type_node
;
8571 DECL_ARG_TYPE (decl
) = integer_type_node
;
8572 layout_decl (decl
, 0);
8574 warn_if_shadowing (decl
);
8576 /* If no declaration found, default to int. */
8579 /* FIXME diagnostics: This should be the location of the argument,
8580 not the FNDECL. E.g., for an old-style declaration
8582 int f10(v) { blah; }
8584 We should use the location of the V, not the F10.
8585 Unfortunately, the V is an IDENTIFIER_NODE which has no
8586 location. In the future we need locations for c_arg_info
8589 See gcc.dg/Wshadow-3.c for an example of this problem. */
8590 decl
= build_decl (DECL_SOURCE_LOCATION (fndecl
),
8591 PARM_DECL
, TREE_VALUE (parm
), integer_type_node
);
8592 DECL_ARG_TYPE (decl
) = TREE_TYPE (decl
);
8594 warn_if_shadowing (decl
);
8597 pedwarn (DECL_SOURCE_LOCATION (decl
),
8598 OPT_Wimplicit_int
, "type of %qD defaults to %<int%>",
8601 warning_at (DECL_SOURCE_LOCATION (decl
),
8602 OPT_Wmissing_parameter_type
,
8603 "type of %qD defaults to %<int%>", decl
);
8606 TREE_PURPOSE (parm
) = decl
;
8607 seen_args
.add (decl
);
8610 /* Now examine the parms chain for incomplete declarations
8611 and declarations with no corresponding names. */
8613 for (b
= current_scope
->bindings
; b
; b
= b
->prev
)
8616 if (TREE_CODE (parm
) != PARM_DECL
)
8619 if (TREE_TYPE (parm
) != error_mark_node
8620 && !COMPLETE_TYPE_P (TREE_TYPE (parm
)))
8622 error_at (DECL_SOURCE_LOCATION (parm
),
8623 "parameter %qD has incomplete type", parm
);
8624 TREE_TYPE (parm
) = error_mark_node
;
8627 if (!seen_args
.contains (parm
))
8629 error_at (DECL_SOURCE_LOCATION (parm
),
8630 "declaration for parameter %qD but no such parameter",
8633 /* Pretend the parameter was not missing.
8634 This gets us to a standard state and minimizes
8635 further error messages. */
8636 parmids
= chainon (parmids
, tree_cons (parm
, 0, 0));
8640 /* Chain the declarations together in the order of the list of
8641 names. Store that chain in the function decl, replacing the
8642 list of names. Update the current scope to match. */
8643 DECL_ARGUMENTS (fndecl
) = 0;
8645 for (parm
= parmids
; parm
; parm
= TREE_CHAIN (parm
))
8646 if (TREE_PURPOSE (parm
))
8648 if (parm
&& TREE_PURPOSE (parm
))
8650 last
= TREE_PURPOSE (parm
);
8651 DECL_ARGUMENTS (fndecl
) = last
;
8653 for (parm
= TREE_CHAIN (parm
); parm
; parm
= TREE_CHAIN (parm
))
8654 if (TREE_PURPOSE (parm
))
8656 DECL_CHAIN (last
) = TREE_PURPOSE (parm
);
8657 last
= TREE_PURPOSE (parm
);
8659 DECL_CHAIN (last
) = 0;
8662 /* If there was a previous prototype,
8663 set the DECL_ARG_TYPE of each argument according to
8664 the type previously specified, and report any mismatches. */
8666 if (current_function_prototype_arg_types
)
8669 for (parm
= DECL_ARGUMENTS (fndecl
),
8670 type
= current_function_prototype_arg_types
;
8671 parm
|| (type
&& TREE_VALUE (type
) != error_mark_node
8672 && (TYPE_MAIN_VARIANT (TREE_VALUE (type
)) != void_type_node
));
8673 parm
= DECL_CHAIN (parm
), type
= TREE_CHAIN (type
))
8675 if (parm
== 0 || type
== 0
8676 || TYPE_MAIN_VARIANT (TREE_VALUE (type
)) == void_type_node
)
8678 if (current_function_prototype_built_in
)
8679 warning_at (DECL_SOURCE_LOCATION (fndecl
),
8680 0, "number of arguments doesn%'t match "
8681 "built-in prototype");
8684 /* FIXME diagnostics: This should be the location of
8685 FNDECL, but there is bug when a prototype is
8686 declared inside function context, but defined
8687 outside of it (e.g., gcc.dg/pr15698-2.c). In
8688 which case FNDECL gets the location of the
8689 prototype, not the definition. */
8690 error_at (input_location
,
8691 "number of arguments doesn%'t match prototype");
8693 error_at (current_function_prototype_locus
,
8694 "prototype declaration");
8698 /* Type for passing arg must be consistent with that
8699 declared for the arg. ISO C says we take the unqualified
8700 type for parameters declared with qualified type. */
8701 if (TREE_TYPE (parm
) != error_mark_node
8702 && TREE_TYPE (type
) != error_mark_node
8703 && ((TYPE_ATOMIC (DECL_ARG_TYPE (parm
))
8704 != TYPE_ATOMIC (TREE_VALUE (type
)))
8705 || !comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm
)),
8706 TYPE_MAIN_VARIANT (TREE_VALUE (type
)))))
8708 if ((TYPE_ATOMIC (DECL_ARG_TYPE (parm
))
8709 == TYPE_ATOMIC (TREE_VALUE (type
)))
8710 && (TYPE_MAIN_VARIANT (TREE_TYPE (parm
))
8711 == TYPE_MAIN_VARIANT (TREE_VALUE (type
))))
8713 /* Adjust argument to match prototype. E.g. a previous
8714 `int foo(float);' prototype causes
8715 `int foo(x) float x; {...}' to be treated like
8716 `int foo(float x) {...}'. This is particularly
8717 useful for argument types like uid_t. */
8718 DECL_ARG_TYPE (parm
) = TREE_TYPE (parm
);
8720 if (targetm
.calls
.promote_prototypes (TREE_TYPE (current_function_decl
))
8721 && INTEGRAL_TYPE_P (TREE_TYPE (parm
))
8722 && TYPE_PRECISION (TREE_TYPE (parm
))
8723 < TYPE_PRECISION (integer_type_node
))
8724 DECL_ARG_TYPE (parm
)
8725 = c_type_promotes_to (TREE_TYPE (parm
));
8727 /* ??? Is it possible to get here with a
8728 built-in prototype or will it always have
8729 been diagnosed as conflicting with an
8730 old-style definition and discarded? */
8731 if (current_function_prototype_built_in
)
8732 warning_at (DECL_SOURCE_LOCATION (parm
),
8733 OPT_Wpedantic
, "promoted argument %qD "
8734 "doesn%'t match built-in prototype", parm
);
8737 pedwarn (DECL_SOURCE_LOCATION (parm
),
8738 OPT_Wpedantic
, "promoted argument %qD "
8739 "doesn%'t match prototype", parm
);
8740 pedwarn (current_function_prototype_locus
, OPT_Wpedantic
,
8741 "prototype declaration");
8746 if (current_function_prototype_built_in
)
8747 warning_at (DECL_SOURCE_LOCATION (parm
),
8748 0, "argument %qD doesn%'t match "
8749 "built-in prototype", parm
);
8752 error_at (DECL_SOURCE_LOCATION (parm
),
8753 "argument %qD doesn%'t match prototype", parm
);
8754 error_at (current_function_prototype_locus
,
8755 "prototype declaration");
8760 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl
)) = 0;
8763 /* Otherwise, create a prototype that would match. */
8767 tree actual
= 0, last
= 0, type
;
8769 for (parm
= DECL_ARGUMENTS (fndecl
); parm
; parm
= DECL_CHAIN (parm
))
8771 type
= tree_cons (NULL_TREE
, DECL_ARG_TYPE (parm
), NULL_TREE
);
8773 TREE_CHAIN (last
) = type
;
8778 type
= tree_cons (NULL_TREE
, void_type_node
, NULL_TREE
);
8780 TREE_CHAIN (last
) = type
;
8784 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
8785 of the type of this function, but we need to avoid having this
8786 affect the types of other similarly-typed functions, so we must
8787 first force the generation of an identical (but separate) type
8788 node for the relevant function type. The new node we create
8789 will be a variant of the main variant of the original function
8792 TREE_TYPE (fndecl
) = build_variant_type_copy (TREE_TYPE (fndecl
));
8794 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl
)) = actual
;
8798 /* Store parameter declarations passed in ARG_INFO into the current
8799 function declaration. */
8802 store_parm_decls_from (struct c_arg_info
*arg_info
)
8804 current_function_arg_info
= arg_info
;
8805 store_parm_decls ();
8808 /* Called by walk_tree to look for and update context-less labels. */
8811 set_labels_context_r (tree
*tp
, int *walk_subtrees
, void *data
)
8813 if (TREE_CODE (*tp
) == LABEL_EXPR
8814 && DECL_CONTEXT (LABEL_EXPR_LABEL (*tp
)) == NULL_TREE
)
8816 DECL_CONTEXT (LABEL_EXPR_LABEL (*tp
)) = static_cast<tree
>(data
);
8823 /* Store the parameter declarations into the current function declaration.
8824 This is called after parsing the parameter declarations, before
8825 digesting the body of the function.
8827 For an old-style definition, construct a prototype out of the old-style
8828 parameter declarations and inject it into the function's type. */
8831 store_parm_decls (void)
8833 tree fndecl
= current_function_decl
;
8836 /* The argument information block for FNDECL. */
8837 struct c_arg_info
*arg_info
= current_function_arg_info
;
8838 current_function_arg_info
= 0;
8840 /* True if this definition is written with a prototype. Note:
8841 despite C99 6.7.5.3p14, we can *not* treat an empty argument
8842 list in a function definition as equivalent to (void) -- an
8843 empty argument list specifies the function has no parameters,
8844 but only (void) sets up a prototype for future calls. */
8845 proto
= arg_info
->types
!= 0;
8848 store_parm_decls_newstyle (fndecl
, arg_info
);
8850 store_parm_decls_oldstyle (fndecl
, arg_info
);
8852 /* The next call to push_scope will be a function body. */
8854 next_is_function_body
= true;
8856 /* Write a record describing this function definition to the prototypes
8857 file (if requested). */
8859 gen_aux_info_record (fndecl
, 1, 0, proto
);
8861 /* Initialize the RTL code for the function. */
8862 allocate_struct_function (fndecl
, false);
8864 if (warn_unused_local_typedefs
)
8865 cfun
->language
= ggc_cleared_alloc
<language_function
> ();
8867 /* Begin the statement tree for this function. */
8868 DECL_SAVED_TREE (fndecl
) = push_stmt_list ();
8870 /* ??? Insert the contents of the pending sizes list into the function
8871 to be evaluated. The only reason left to have this is
8872 void foo(int n, int array[n++])
8873 because we throw away the array type in favor of a pointer type, and
8874 thus won't naturally see the SAVE_EXPR containing the increment. All
8875 other pending sizes would be handled by gimplify_parameters. */
8876 if (arg_info
->pending_sizes
)
8878 /* In very special circumstances, e.g. for code like
8880 void f (int a[i += 2]) {}
8881 we need to execute the atomic assignment on function entry.
8882 But in this case, it is not just a straight store, it has the
8883 op= form, which means that build_atomic_assign has generated
8884 gotos, labels, etc. Because at that time the function decl
8885 for F has not been created yet, those labels do not have any
8886 function context. But we have the fndecl now, so update the
8887 labels accordingly. gimplify_expr would crash otherwise. */
8888 walk_tree_without_duplicates (&arg_info
->pending_sizes
,
8889 set_labels_context_r
, fndecl
);
8890 add_stmt (arg_info
->pending_sizes
);
8894 /* Store PARM_DECLs in PARMS into scope temporarily. Used for
8895 c_finish_omp_declare_simd for function prototypes. No diagnostics
8899 temp_store_parm_decls (tree fndecl
, tree parms
)
8902 for (tree p
= parms
; p
; p
= DECL_CHAIN (p
))
8904 DECL_CONTEXT (p
) = fndecl
;
8906 bind (DECL_NAME (p
), p
, current_scope
,
8907 /*invisible=*/false, /*nested=*/false,
8912 /* Undo what temp_store_parm_decls did. */
8915 temp_pop_parm_decls (void)
8917 /* Clear all bindings in this temporary scope, so that
8918 pop_scope doesn't create a BLOCK. */
8919 struct c_binding
*b
= current_scope
->bindings
;
8920 current_scope
->bindings
= NULL
;
8921 for (; b
; b
= free_binding_and_advance (b
))
8923 gcc_assert (TREE_CODE (b
->decl
) == PARM_DECL
8924 || b
->decl
== error_mark_node
);
8925 gcc_assert (I_SYMBOL_BINDING (b
->id
) == b
);
8926 I_SYMBOL_BINDING (b
->id
) = b
->shadowed
;
8927 if (b
->shadowed
&& b
->shadowed
->u
.type
)
8928 TREE_TYPE (b
->shadowed
->decl
) = b
->shadowed
->u
.type
;
8934 /* Finish up a function declaration and compile that function
8935 all the way to assembler language output. Then free the storage
8936 for the function definition.
8938 This is called after parsing the body of the function definition. */
8941 finish_function (void)
8943 tree fndecl
= current_function_decl
;
8945 if (c_dialect_objc ())
8946 objc_finish_function ();
8948 if (TREE_CODE (fndecl
) == FUNCTION_DECL
8949 && targetm
.calls
.promote_prototypes (TREE_TYPE (fndecl
)))
8951 tree args
= DECL_ARGUMENTS (fndecl
);
8952 for (; args
; args
= DECL_CHAIN (args
))
8954 tree type
= TREE_TYPE (args
);
8955 if (INTEGRAL_TYPE_P (type
)
8956 && TYPE_PRECISION (type
) < TYPE_PRECISION (integer_type_node
))
8957 DECL_ARG_TYPE (args
) = c_type_promotes_to (type
);
8961 if (DECL_INITIAL (fndecl
) && DECL_INITIAL (fndecl
) != error_mark_node
)
8962 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl
)) = fndecl
;
8964 /* Must mark the RESULT_DECL as being in this function. */
8966 if (DECL_RESULT (fndecl
) && DECL_RESULT (fndecl
) != error_mark_node
)
8967 DECL_CONTEXT (DECL_RESULT (fndecl
)) = fndecl
;
8969 if (MAIN_NAME_P (DECL_NAME (fndecl
)) && flag_hosted
8970 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl
)))
8971 == integer_type_node
&& flag_isoc99
)
8973 /* Hack. We don't want the middle-end to warn that this return
8974 is unreachable, so we mark its location as special. Using
8975 UNKNOWN_LOCATION has the problem that it gets clobbered in
8976 annotate_one_with_locus. A cleaner solution might be to
8977 ensure ! should_carry_locus_p (stmt), but that needs a flag.
8979 c_finish_return (BUILTINS_LOCATION
, integer_zero_node
, NULL_TREE
);
8982 /* Tie off the statement tree for this function. */
8983 DECL_SAVED_TREE (fndecl
) = pop_stmt_list (DECL_SAVED_TREE (fndecl
));
8985 /* If the function has _Cilk_spawn in front of a function call inside it
8986 i.e. it is a spawning function, then add the appropriate Cilk plus
8987 functions inside. */
8988 if (fn_contains_cilk_spawn_p (cfun
))
8989 cfun
->cilk_frame_decl
= insert_cilk_frame (fndecl
);
8991 finish_fname_decls ();
8993 /* Complain if there's just no return statement. */
8994 if (warn_return_type
8995 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl
))) != VOID_TYPE
8996 && !current_function_returns_value
&& !current_function_returns_null
8997 /* Don't complain if we are no-return. */
8998 && !current_function_returns_abnormally
8999 /* Don't complain if we are declared noreturn. */
9000 && !TREE_THIS_VOLATILE (fndecl
)
9001 /* Don't warn for main(). */
9002 && !MAIN_NAME_P (DECL_NAME (fndecl
))
9003 /* Or if they didn't actually specify a return type. */
9004 && !C_FUNCTION_IMPLICIT_INT (fndecl
)
9005 /* Normally, with -Wreturn-type, flow will complain, but we might
9006 optimize out static functions. */
9007 && !TREE_PUBLIC (fndecl
))
9009 warning (OPT_Wreturn_type
,
9010 "no return statement in function returning non-void");
9011 TREE_NO_WARNING (fndecl
) = 1;
9014 /* Complain about parameters that are only set, but never otherwise used. */
9015 if (warn_unused_but_set_parameter
)
9019 for (decl
= DECL_ARGUMENTS (fndecl
);
9021 decl
= DECL_CHAIN (decl
))
9022 if (TREE_USED (decl
)
9023 && TREE_CODE (decl
) == PARM_DECL
9024 && !DECL_READ_P (decl
)
9026 && !DECL_ARTIFICIAL (decl
)
9027 && !TREE_NO_WARNING (decl
))
9028 warning_at (DECL_SOURCE_LOCATION (decl
),
9029 OPT_Wunused_but_set_parameter
,
9030 "parameter %qD set but not used", decl
);
9033 /* Complain about locally defined typedefs that are not used in this
9035 maybe_warn_unused_local_typedefs ();
9037 /* Possibly warn about unused parameters. */
9038 if (warn_unused_parameter
)
9039 do_warn_unused_parameter (fndecl
);
9041 /* Store the end of the function, so that we get good line number
9042 info for the epilogue. */
9043 cfun
->function_end_locus
= input_location
;
9045 /* Finalize the ELF visibility for the function. */
9046 c_determine_visibility (fndecl
);
9048 /* For GNU C extern inline functions disregard inline limits. */
9049 if (DECL_EXTERNAL (fndecl
)
9050 && DECL_DECLARED_INLINE_P (fndecl
))
9051 DECL_DISREGARD_INLINE_LIMITS (fndecl
) = 1;
9053 /* Genericize before inlining. Delay genericizing nested functions
9054 until their parent function is genericized. Since finalizing
9055 requires GENERIC, delay that as well. */
9057 if (DECL_INITIAL (fndecl
) && DECL_INITIAL (fndecl
) != error_mark_node
9058 && !undef_nested_function
)
9060 if (!decl_function_context (fndecl
))
9062 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE
, fndecl
);
9063 c_genericize (fndecl
);
9065 /* ??? Objc emits functions after finalizing the compilation unit.
9066 This should be cleaned up later and this conditional removed. */
9067 if (symtab
->global_info_ready
)
9069 cgraph_node::add_new_function (fndecl
, false);
9072 cgraph_node::finalize_function (fndecl
, false);
9076 /* Register this function with cgraph just far enough to get it
9077 added to our parent's nested function list. Handy, since the
9078 C front end doesn't have such a list. */
9079 (void) cgraph_node::get_create (fndecl
);
9083 if (!decl_function_context (fndecl
))
9084 undef_nested_function
= false;
9086 if (cfun
->language
!= NULL
)
9088 ggc_free (cfun
->language
);
9089 cfun
->language
= NULL
;
9092 /* We're leaving the context of this function, so zap cfun.
9093 It's still in DECL_STRUCT_FUNCTION, and we'll restore it in
9094 tree_rest_of_compilation. */
9096 invoke_plugin_callbacks (PLUGIN_FINISH_PARSE_FUNCTION
, current_function_decl
);
9097 current_function_decl
= NULL
;
9100 /* Check the declarations given in a for-loop for satisfying the C99
9101 constraints. If exactly one such decl is found, return it. LOC is
9102 the location of the opening parenthesis of the for loop. The last
9103 parameter allows you to control the "for loop initial declarations
9104 are only allowed in C99 mode". Normally, you should pass
9105 flag_isoc99 as that parameter. But in some cases (Objective-C
9106 foreach loop, for example) we want to run the checks in this
9107 function even if not in C99 mode, so we allow the caller to turn
9108 off the error about not being in C99 mode.
9112 check_for_loop_decls (location_t loc
, bool turn_off_iso_c99_error
)
9114 struct c_binding
*b
;
9115 tree one_decl
= NULL_TREE
;
9118 if (!turn_off_iso_c99_error
)
9120 static bool hint
= true;
9121 /* If we get here, declarations have been used in a for loop without
9122 the C99 for loop scope. This doesn't make much sense, so don't
9124 error_at (loc
, "%<for%> loop initial declarations "
9125 "are only allowed in C99 or C11 mode");
9129 "use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 "
9130 "to compile your code");
9135 /* C99 subclause 6.8.5 paragraph 3:
9137 [#3] The declaration part of a for statement shall only
9138 declare identifiers for objects having storage class auto or
9141 It isn't clear whether, in this sentence, "identifiers" binds to
9142 "shall only declare" or to "objects" - that is, whether all identifiers
9143 declared must be identifiers for objects, or whether the restriction
9144 only applies to those that are. (A question on this in comp.std.c
9145 in November 2000 received no answer.) We implement the strictest
9146 interpretation, to avoid creating an extension which later causes
9149 for (b
= current_scope
->bindings
; b
; b
= b
->prev
)
9152 tree decl
= b
->decl
;
9157 switch (TREE_CODE (decl
))
9161 location_t decl_loc
= DECL_SOURCE_LOCATION (decl
);
9162 if (TREE_STATIC (decl
))
9164 "declaration of static variable %qD in %<for%> loop "
9165 "initial declaration", decl
);
9166 else if (DECL_EXTERNAL (decl
))
9168 "declaration of %<extern%> variable %qD in %<for%> loop "
9169 "initial declaration", decl
);
9175 "%<struct %E%> declared in %<for%> loop initial "
9180 "%<union %E%> declared in %<for%> loop initial declaration",
9184 error_at (loc
, "%<enum %E%> declared in %<for%> loop "
9185 "initial declaration", id
);
9188 error_at (loc
, "declaration of non-variable "
9189 "%qD in %<for%> loop initial declaration", decl
);
9196 return n_decls
== 1 ? one_decl
: NULL_TREE
;
9199 /* Save and reinitialize the variables
9200 used during compilation of a C function. */
9203 c_push_function_context (void)
9205 struct language_function
*p
= cfun
->language
;
9206 /* cfun->language might have been already allocated by the use of
9207 -Wunused-local-typedefs. In that case, just re-use it. */
9209 cfun
->language
= p
= ggc_cleared_alloc
<language_function
> ();
9211 p
->base
.x_stmt_tree
= c_stmt_tree
;
9212 c_stmt_tree
.x_cur_stmt_list
= vec_safe_copy (c_stmt_tree
.x_cur_stmt_list
);
9213 p
->x_break_label
= c_break_label
;
9214 p
->x_cont_label
= c_cont_label
;
9215 p
->x_switch_stack
= c_switch_stack
;
9216 p
->arg_info
= current_function_arg_info
;
9217 p
->returns_value
= current_function_returns_value
;
9218 p
->returns_null
= current_function_returns_null
;
9219 p
->returns_abnormally
= current_function_returns_abnormally
;
9220 p
->warn_about_return_type
= warn_about_return_type
;
9222 push_function_context ();
9225 /* Restore the variables used during compilation of a C function. */
9228 c_pop_function_context (void)
9230 struct language_function
*p
;
9232 pop_function_context ();
9235 /* When -Wunused-local-typedefs is in effect, cfun->languages is
9236 used to store data throughout the life time of the current cfun,
9237 So don't deallocate it. */
9238 if (!warn_unused_local_typedefs
)
9239 cfun
->language
= NULL
;
9241 if (DECL_STRUCT_FUNCTION (current_function_decl
) == 0
9242 && DECL_SAVED_TREE (current_function_decl
) == NULL_TREE
)
9244 /* Stop pointing to the local nodes about to be freed. */
9245 /* But DECL_INITIAL must remain nonzero so we know this
9246 was an actual function definition. */
9247 DECL_INITIAL (current_function_decl
) = error_mark_node
;
9248 DECL_ARGUMENTS (current_function_decl
) = 0;
9251 c_stmt_tree
= p
->base
.x_stmt_tree
;
9252 p
->base
.x_stmt_tree
.x_cur_stmt_list
= NULL
;
9253 c_break_label
= p
->x_break_label
;
9254 c_cont_label
= p
->x_cont_label
;
9255 c_switch_stack
= p
->x_switch_stack
;
9256 current_function_arg_info
= p
->arg_info
;
9257 current_function_returns_value
= p
->returns_value
;
9258 current_function_returns_null
= p
->returns_null
;
9259 current_function_returns_abnormally
= p
->returns_abnormally
;
9260 warn_about_return_type
= p
->warn_about_return_type
;
9263 /* The functions below are required for functionality of doing
9264 function at once processing in the C front end. Currently these
9265 functions are not called from anywhere in the C front end, but as
9266 these changes continue, that will change. */
9268 /* Returns the stmt_tree (if any) to which statements are currently
9269 being added. If there is no active statement-tree, NULL is
9273 current_stmt_tree (void)
9275 return &c_stmt_tree
;
9278 /* Return the global value of T as a symbol. */
9281 identifier_global_value (tree t
)
9283 struct c_binding
*b
;
9285 for (b
= I_SYMBOL_BINDING (t
); b
; b
= b
->shadowed
)
9286 if (B_IN_FILE_SCOPE (b
) || B_IN_EXTERNAL_SCOPE (b
))
9292 /* In C, the only C-linkage public declaration is at file scope. */
9295 c_linkage_bindings (tree name
)
9297 return identifier_global_value (name
);
9300 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
9301 otherwise the name is found in ridpointers from RID_INDEX. */
9304 record_builtin_type (enum rid rid_index
, const char *name
, tree type
)
9308 id
= ridpointers
[(int) rid_index
];
9310 id
= get_identifier (name
);
9311 decl
= build_decl (UNKNOWN_LOCATION
, TYPE_DECL
, id
, type
);
9313 if (debug_hooks
->type_decl
)
9314 debug_hooks
->type_decl (decl
, false);
9317 /* Build the void_list_node (void_type_node having been created). */
9319 build_void_list_node (void)
9321 tree t
= build_tree_list (NULL_TREE
, void_type_node
);
9325 /* Return a c_parm structure with the given SPECS, ATTRS and DECLARATOR. */
9328 build_c_parm (struct c_declspecs
*specs
, tree attrs
,
9329 struct c_declarator
*declarator
)
9331 struct c_parm
*ret
= XOBNEW (&parser_obstack
, struct c_parm
);
9334 ret
->declarator
= declarator
;
9338 /* Return a declarator with nested attributes. TARGET is the inner
9339 declarator to which these attributes apply. ATTRS are the
9342 struct c_declarator
*
9343 build_attrs_declarator (tree attrs
, struct c_declarator
*target
)
9345 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
9346 ret
->kind
= cdk_attrs
;
9347 ret
->declarator
= target
;
9348 ret
->u
.attrs
= attrs
;
9352 /* Return a declarator for a function with arguments specified by ARGS
9353 and return type specified by TARGET. */
9355 struct c_declarator
*
9356 build_function_declarator (struct c_arg_info
*args
,
9357 struct c_declarator
*target
)
9359 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
9360 ret
->kind
= cdk_function
;
9361 ret
->declarator
= target
;
9362 ret
->u
.arg_info
= args
;
9366 /* Return a declarator for the identifier IDENT (which may be
9367 NULL_TREE for an abstract declarator). */
9369 struct c_declarator
*
9370 build_id_declarator (tree ident
)
9372 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
9374 ret
->declarator
= 0;
9376 /* Default value - may get reset to a more precise location. */
9377 ret
->id_loc
= input_location
;
9381 /* Return something to represent absolute declarators containing a *.
9382 TARGET is the absolute declarator that the * contains.
9383 TYPE_QUALS_ATTRS is a structure for type qualifiers and attributes
9384 to apply to the pointer type. */
9386 struct c_declarator
*
9387 make_pointer_declarator (struct c_declspecs
*type_quals_attrs
,
9388 struct c_declarator
*target
)
9392 struct c_declarator
*itarget
= target
;
9393 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
9394 if (type_quals_attrs
)
9396 attrs
= type_quals_attrs
->attrs
;
9397 quals
= quals_from_declspecs (type_quals_attrs
);
9398 if (attrs
!= NULL_TREE
)
9399 itarget
= build_attrs_declarator (attrs
, target
);
9401 ret
->kind
= cdk_pointer
;
9402 ret
->declarator
= itarget
;
9403 ret
->u
.pointer_quals
= quals
;
9407 /* Return a pointer to a structure for an empty list of declaration
9410 struct c_declspecs
*
9411 build_null_declspecs (void)
9413 struct c_declspecs
*ret
= XOBNEW (&parser_obstack
, struct c_declspecs
);
9414 memset (&ret
->locations
, 0, cdw_number_of_elements
);
9419 ret
->align_log
= -1;
9420 ret
->typespec_word
= cts_none
;
9421 ret
->storage_class
= csc_none
;
9422 ret
->expr_const_operands
= true;
9423 ret
->declspecs_seen_p
= false;
9424 ret
->typespec_kind
= ctsk_none
;
9425 ret
->non_sc_seen_p
= false;
9426 ret
->typedef_p
= false;
9427 ret
->explicit_signed_p
= false;
9428 ret
->deprecated_p
= false;
9429 ret
->default_int_p
= false;
9430 ret
->long_p
= false;
9431 ret
->long_long_p
= false;
9432 ret
->short_p
= false;
9433 ret
->signed_p
= false;
9434 ret
->unsigned_p
= false;
9435 ret
->complex_p
= false;
9436 ret
->inline_p
= false;
9437 ret
->noreturn_p
= false;
9438 ret
->thread_p
= false;
9439 ret
->thread_gnu_p
= false;
9440 ret
->const_p
= false;
9441 ret
->volatile_p
= false;
9442 ret
->atomic_p
= false;
9443 ret
->restrict_p
= false;
9444 ret
->saturating_p
= false;
9445 ret
->alignas_p
= false;
9446 ret
->address_space
= ADDR_SPACE_GENERIC
;
9450 /* Add the address space ADDRSPACE to the declaration specifiers
9451 SPECS, returning SPECS. */
9453 struct c_declspecs
*
9454 declspecs_add_addrspace (source_location location
,
9455 struct c_declspecs
*specs
, addr_space_t as
)
9457 specs
->non_sc_seen_p
= true;
9458 specs
->declspecs_seen_p
= true;
9460 if (!ADDR_SPACE_GENERIC_P (specs
->address_space
)
9461 && specs
->address_space
!= as
)
9462 error ("incompatible address space qualifiers %qs and %qs",
9463 c_addr_space_name (as
),
9464 c_addr_space_name (specs
->address_space
));
9467 specs
->address_space
= as
;
9468 specs
->locations
[cdw_address_space
] = location
;
9473 /* Add the type qualifier QUAL to the declaration specifiers SPECS,
9476 struct c_declspecs
*
9477 declspecs_add_qual (source_location loc
,
9478 struct c_declspecs
*specs
, tree qual
)
9482 specs
->non_sc_seen_p
= true;
9483 specs
->declspecs_seen_p
= true;
9484 gcc_assert (TREE_CODE (qual
) == IDENTIFIER_NODE
9485 && C_IS_RESERVED_WORD (qual
));
9486 i
= C_RID_CODE (qual
);
9490 dupe
= specs
->const_p
;
9491 specs
->const_p
= true;
9492 specs
->locations
[cdw_const
] = loc
;
9495 dupe
= specs
->volatile_p
;
9496 specs
->volatile_p
= true;
9497 specs
->locations
[cdw_volatile
] = loc
;
9500 dupe
= specs
->restrict_p
;
9501 specs
->restrict_p
= true;
9502 specs
->locations
[cdw_restrict
] = loc
;
9505 dupe
= specs
->atomic_p
;
9506 specs
->atomic_p
= true;
9512 pedwarn_c90 (loc
, OPT_Wpedantic
, "duplicate %qE", qual
);
9516 /* Add the type specifier TYPE to the declaration specifiers SPECS,
9519 struct c_declspecs
*
9520 declspecs_add_type (location_t loc
, struct c_declspecs
*specs
,
9521 struct c_typespec spec
)
9523 tree type
= spec
.spec
;
9524 specs
->non_sc_seen_p
= true;
9525 specs
->declspecs_seen_p
= true;
9526 specs
->typespec_kind
= spec
.kind
;
9527 if (TREE_DEPRECATED (type
))
9528 specs
->deprecated_p
= true;
9530 /* Handle type specifier keywords. */
9531 if (TREE_CODE (type
) == IDENTIFIER_NODE
9532 && C_IS_RESERVED_WORD (type
)
9533 && C_RID_CODE (type
) != RID_CXX_COMPAT_WARN
)
9535 enum rid i
= C_RID_CODE (type
);
9538 error_at (loc
, "two or more data types in declaration specifiers");
9541 if ((int) i
<= (int) RID_LAST_MODIFIER
)
9543 /* "long", "short", "signed", "unsigned", "_Complex" or "_Sat". */
9548 if (specs
->long_long_p
)
9550 error_at (loc
, "%<long long long%> is too long for GCC");
9555 if (specs
->typespec_word
== cts_double
)
9558 ("both %<long long%> and %<double%> in "
9559 "declaration specifiers"));
9562 pedwarn_c90 (loc
, OPT_Wlong_long
,
9563 "ISO C90 does not support %<long long%>");
9564 specs
->long_long_p
= 1;
9565 specs
->locations
[cdw_long_long
] = loc
;
9570 ("both %<long%> and %<short%> in "
9571 "declaration specifiers"));
9572 else if (specs
->typespec_word
== cts_auto_type
)
9574 ("both %<long%> and %<__auto_type%> in "
9575 "declaration specifiers"));
9576 else if (specs
->typespec_word
== cts_void
)
9578 ("both %<long%> and %<void%> in "
9579 "declaration specifiers"));
9580 else if (specs
->typespec_word
== cts_int_n
)
9582 ("both %<long%> and %<__int%d%> in "
9583 "declaration specifiers"),
9584 int_n_data
[specs
->int_n_idx
].bitsize
);
9585 else if (specs
->typespec_word
== cts_bool
)
9587 ("both %<long%> and %<_Bool%> in "
9588 "declaration specifiers"));
9589 else if (specs
->typespec_word
== cts_char
)
9591 ("both %<long%> and %<char%> in "
9592 "declaration specifiers"));
9593 else if (specs
->typespec_word
== cts_float
)
9595 ("both %<long%> and %<float%> in "
9596 "declaration specifiers"));
9597 else if (specs
->typespec_word
== cts_dfloat32
)
9599 ("both %<long%> and %<_Decimal32%> in "
9600 "declaration specifiers"));
9601 else if (specs
->typespec_word
== cts_dfloat64
)
9603 ("both %<long%> and %<_Decimal64%> in "
9604 "declaration specifiers"));
9605 else if (specs
->typespec_word
== cts_dfloat128
)
9607 ("both %<long%> and %<_Decimal128%> in "
9608 "declaration specifiers"));
9611 specs
->long_p
= true;
9612 specs
->locations
[cdw_long
] = loc
;
9616 dupe
= specs
->short_p
;
9619 ("both %<long%> and %<short%> in "
9620 "declaration specifiers"));
9621 else if (specs
->typespec_word
== cts_auto_type
)
9623 ("both %<short%> and %<__auto_type%> in "
9624 "declaration specifiers"));
9625 else if (specs
->typespec_word
== cts_void
)
9627 ("both %<short%> and %<void%> in "
9628 "declaration specifiers"));
9629 else if (specs
->typespec_word
== cts_int_n
)
9631 ("both %<short%> and %<__int%d%> in "
9632 "declaration specifiers"),
9633 int_n_data
[specs
->int_n_idx
].bitsize
);
9634 else if (specs
->typespec_word
== cts_bool
)
9636 ("both %<short%> and %<_Bool%> in "
9637 "declaration specifiers"));
9638 else if (specs
->typespec_word
== cts_char
)
9640 ("both %<short%> and %<char%> in "
9641 "declaration specifiers"));
9642 else if (specs
->typespec_word
== cts_float
)
9644 ("both %<short%> and %<float%> in "
9645 "declaration specifiers"));
9646 else if (specs
->typespec_word
== cts_double
)
9648 ("both %<short%> and %<double%> in "
9649 "declaration specifiers"));
9650 else if (specs
->typespec_word
== cts_dfloat32
)
9652 ("both %<short%> and %<_Decimal32%> in "
9653 "declaration specifiers"));
9654 else if (specs
->typespec_word
== cts_dfloat64
)
9656 ("both %<short%> and %<_Decimal64%> in "
9657 "declaration specifiers"));
9658 else if (specs
->typespec_word
== cts_dfloat128
)
9660 ("both %<short%> and %<_Decimal128%> in "
9661 "declaration specifiers"));
9664 specs
->short_p
= true;
9665 specs
->locations
[cdw_short
] = loc
;
9669 dupe
= specs
->signed_p
;
9670 if (specs
->unsigned_p
)
9672 ("both %<signed%> and %<unsigned%> in "
9673 "declaration specifiers"));
9674 else if (specs
->typespec_word
== cts_auto_type
)
9676 ("both %<signed%> and %<__auto_type%> in "
9677 "declaration specifiers"));
9678 else if (specs
->typespec_word
== cts_void
)
9680 ("both %<signed%> and %<void%> in "
9681 "declaration specifiers"));
9682 else if (specs
->typespec_word
== cts_bool
)
9684 ("both %<signed%> and %<_Bool%> in "
9685 "declaration specifiers"));
9686 else if (specs
->typespec_word
== cts_float
)
9688 ("both %<signed%> and %<float%> in "
9689 "declaration specifiers"));
9690 else if (specs
->typespec_word
== cts_double
)
9692 ("both %<signed%> and %<double%> in "
9693 "declaration specifiers"));
9694 else if (specs
->typespec_word
== cts_dfloat32
)
9696 ("both %<signed%> and %<_Decimal32%> in "
9697 "declaration specifiers"));
9698 else if (specs
->typespec_word
== cts_dfloat64
)
9700 ("both %<signed%> and %<_Decimal64%> in "
9701 "declaration specifiers"));
9702 else if (specs
->typespec_word
== cts_dfloat128
)
9704 ("both %<signed%> and %<_Decimal128%> in "
9705 "declaration specifiers"));
9708 specs
->signed_p
= true;
9709 specs
->locations
[cdw_signed
] = loc
;
9713 dupe
= specs
->unsigned_p
;
9714 if (specs
->signed_p
)
9716 ("both %<signed%> and %<unsigned%> in "
9717 "declaration specifiers"));
9718 else if (specs
->typespec_word
== cts_auto_type
)
9720 ("both %<unsigned%> and %<__auto_type%> in "
9721 "declaration specifiers"));
9722 else if (specs
->typespec_word
== cts_void
)
9724 ("both %<unsigned%> and %<void%> in "
9725 "declaration specifiers"));
9726 else if (specs
->typespec_word
== cts_bool
)
9728 ("both %<unsigned%> and %<_Bool%> in "
9729 "declaration specifiers"));
9730 else if (specs
->typespec_word
== cts_float
)
9732 ("both %<unsigned%> and %<float%> in "
9733 "declaration specifiers"));
9734 else if (specs
->typespec_word
== cts_double
)
9736 ("both %<unsigned%> and %<double%> in "
9737 "declaration specifiers"));
9738 else if (specs
->typespec_word
== cts_dfloat32
)
9740 ("both %<unsigned%> and %<_Decimal32%> in "
9741 "declaration specifiers"));
9742 else if (specs
->typespec_word
== cts_dfloat64
)
9744 ("both %<unsigned%> and %<_Decimal64%> in "
9745 "declaration specifiers"));
9746 else if (specs
->typespec_word
== cts_dfloat128
)
9748 ("both %<unsigned%> and %<_Decimal128%> in "
9749 "declaration specifiers"));
9752 specs
->unsigned_p
= true;
9753 specs
->locations
[cdw_unsigned
] = loc
;
9757 dupe
= specs
->complex_p
;
9758 if (!in_system_header_at (loc
))
9759 pedwarn_c90 (loc
, OPT_Wpedantic
,
9760 "ISO C90 does not support complex types");
9761 if (specs
->typespec_word
== cts_auto_type
)
9763 ("both %<complex%> and %<__auto_type%> in "
9764 "declaration specifiers"));
9765 else if (specs
->typespec_word
== cts_void
)
9767 ("both %<complex%> and %<void%> in "
9768 "declaration specifiers"));
9769 else if (specs
->typespec_word
== cts_bool
)
9771 ("both %<complex%> and %<_Bool%> in "
9772 "declaration specifiers"));
9773 else if (specs
->typespec_word
== cts_dfloat32
)
9775 ("both %<complex%> and %<_Decimal32%> in "
9776 "declaration specifiers"));
9777 else if (specs
->typespec_word
== cts_dfloat64
)
9779 ("both %<complex%> and %<_Decimal64%> in "
9780 "declaration specifiers"));
9781 else if (specs
->typespec_word
== cts_dfloat128
)
9783 ("both %<complex%> and %<_Decimal128%> in "
9784 "declaration specifiers"));
9785 else if (specs
->typespec_word
== cts_fract
)
9787 ("both %<complex%> and %<_Fract%> in "
9788 "declaration specifiers"));
9789 else if (specs
->typespec_word
== cts_accum
)
9791 ("both %<complex%> and %<_Accum%> in "
9792 "declaration specifiers"));
9793 else if (specs
->saturating_p
)
9795 ("both %<complex%> and %<_Sat%> in "
9796 "declaration specifiers"));
9799 specs
->complex_p
= true;
9800 specs
->locations
[cdw_complex
] = loc
;
9804 dupe
= specs
->saturating_p
;
9805 pedwarn (loc
, OPT_Wpedantic
,
9806 "ISO C does not support saturating types");
9807 if (specs
->typespec_word
== cts_int_n
)
9810 ("both %<_Sat%> and %<__int%d%> in "
9811 "declaration specifiers"),
9812 int_n_data
[specs
->int_n_idx
].bitsize
);
9814 else if (specs
->typespec_word
== cts_auto_type
)
9816 ("both %<_Sat%> and %<__auto_type%> in "
9817 "declaration specifiers"));
9818 else if (specs
->typespec_word
== cts_void
)
9820 ("both %<_Sat%> and %<void%> in "
9821 "declaration specifiers"));
9822 else if (specs
->typespec_word
== cts_bool
)
9824 ("both %<_Sat%> and %<_Bool%> in "
9825 "declaration specifiers"));
9826 else if (specs
->typespec_word
== cts_char
)
9828 ("both %<_Sat%> and %<char%> in "
9829 "declaration specifiers"));
9830 else if (specs
->typespec_word
== cts_int
)
9832 ("both %<_Sat%> and %<int%> in "
9833 "declaration specifiers"));
9834 else if (specs
->typespec_word
== cts_float
)
9836 ("both %<_Sat%> and %<float%> in "
9837 "declaration specifiers"));
9838 else if (specs
->typespec_word
== cts_double
)
9840 ("both %<_Sat%> and %<double%> in "
9841 "declaration specifiers"));
9842 else if (specs
->typespec_word
== cts_dfloat32
)
9844 ("both %<_Sat%> and %<_Decimal32%> in "
9845 "declaration specifiers"));
9846 else if (specs
->typespec_word
== cts_dfloat64
)
9848 ("both %<_Sat%> and %<_Decimal64%> in "
9849 "declaration specifiers"));
9850 else if (specs
->typespec_word
== cts_dfloat128
)
9852 ("both %<_Sat%> and %<_Decimal128%> in "
9853 "declaration specifiers"));
9854 else if (specs
->complex_p
)
9856 ("both %<_Sat%> and %<complex%> in "
9857 "declaration specifiers"));
9860 specs
->saturating_p
= true;
9861 specs
->locations
[cdw_saturating
] = loc
;
9869 error_at (loc
, "duplicate %qE", type
);
9875 /* "void", "_Bool", "char", "int", "float", "double", "_Decimal32",
9876 "__intN", "_Decimal64", "_Decimal128", "_Fract", "_Accum" or
9878 if (specs
->typespec_word
!= cts_none
)
9881 "two or more data types in declaration specifiers");
9889 ("both %<long%> and %<__auto_type%> in "
9890 "declaration specifiers"));
9891 else if (specs
->short_p
)
9893 ("both %<short%> and %<__auto_type%> in "
9894 "declaration specifiers"));
9895 else if (specs
->signed_p
)
9897 ("both %<signed%> and %<__auto_type%> in "
9898 "declaration specifiers"));
9899 else if (specs
->unsigned_p
)
9901 ("both %<unsigned%> and %<__auto_type%> in "
9902 "declaration specifiers"));
9903 else if (specs
->complex_p
)
9905 ("both %<complex%> and %<__auto_type%> in "
9906 "declaration specifiers"));
9907 else if (specs
->saturating_p
)
9909 ("both %<_Sat%> and %<__auto_type%> in "
9910 "declaration specifiers"));
9913 specs
->typespec_word
= cts_auto_type
;
9914 specs
->locations
[cdw_typespec
] = loc
;
9921 specs
->int_n_idx
= i
- RID_INT_N_0
;
9922 if (!in_system_header_at (input_location
))
9923 pedwarn (loc
, OPT_Wpedantic
,
9924 "ISO C does not support %<__int%d%> types",
9925 int_n_data
[specs
->int_n_idx
].bitsize
);
9929 ("both %<__int%d%> and %<long%> in "
9930 "declaration specifiers"),
9931 int_n_data
[specs
->int_n_idx
].bitsize
);
9932 else if (specs
->saturating_p
)
9934 ("both %<_Sat%> and %<__int%d%> in "
9935 "declaration specifiers"),
9936 int_n_data
[specs
->int_n_idx
].bitsize
);
9937 else if (specs
->short_p
)
9939 ("both %<__int%d%> and %<short%> in "
9940 "declaration specifiers"),
9941 int_n_data
[specs
->int_n_idx
].bitsize
);
9942 else if (! int_n_enabled_p
[specs
->int_n_idx
])
9944 "%<__int%d%> is not supported on this target",
9945 int_n_data
[specs
->int_n_idx
].bitsize
);
9948 specs
->typespec_word
= cts_int_n
;
9949 specs
->locations
[cdw_typespec
] = loc
;
9955 ("both %<long%> and %<void%> in "
9956 "declaration specifiers"));
9957 else if (specs
->short_p
)
9959 ("both %<short%> and %<void%> in "
9960 "declaration specifiers"));
9961 else if (specs
->signed_p
)
9963 ("both %<signed%> and %<void%> in "
9964 "declaration specifiers"));
9965 else if (specs
->unsigned_p
)
9967 ("both %<unsigned%> and %<void%> in "
9968 "declaration specifiers"));
9969 else if (specs
->complex_p
)
9971 ("both %<complex%> and %<void%> in "
9972 "declaration specifiers"));
9973 else if (specs
->saturating_p
)
9975 ("both %<_Sat%> and %<void%> in "
9976 "declaration specifiers"));
9979 specs
->typespec_word
= cts_void
;
9980 specs
->locations
[cdw_typespec
] = loc
;
9984 if (!in_system_header_at (loc
))
9985 pedwarn_c90 (loc
, OPT_Wpedantic
,
9986 "ISO C90 does not support boolean types");
9989 ("both %<long%> and %<_Bool%> in "
9990 "declaration specifiers"));
9991 else if (specs
->short_p
)
9993 ("both %<short%> and %<_Bool%> in "
9994 "declaration specifiers"));
9995 else if (specs
->signed_p
)
9997 ("both %<signed%> and %<_Bool%> in "
9998 "declaration specifiers"));
9999 else if (specs
->unsigned_p
)
10001 ("both %<unsigned%> and %<_Bool%> in "
10002 "declaration specifiers"));
10003 else if (specs
->complex_p
)
10005 ("both %<complex%> and %<_Bool%> in "
10006 "declaration specifiers"));
10007 else if (specs
->saturating_p
)
10009 ("both %<_Sat%> and %<_Bool%> in "
10010 "declaration specifiers"));
10013 specs
->typespec_word
= cts_bool
;
10014 specs
->locations
[cdw_typespec
] = loc
;
10020 ("both %<long%> and %<char%> in "
10021 "declaration specifiers"));
10022 else if (specs
->short_p
)
10024 ("both %<short%> and %<char%> in "
10025 "declaration specifiers"));
10026 else if (specs
->saturating_p
)
10028 ("both %<_Sat%> and %<char%> in "
10029 "declaration specifiers"));
10032 specs
->typespec_word
= cts_char
;
10033 specs
->locations
[cdw_typespec
] = loc
;
10037 if (specs
->saturating_p
)
10039 ("both %<_Sat%> and %<int%> in "
10040 "declaration specifiers"));
10043 specs
->typespec_word
= cts_int
;
10044 specs
->locations
[cdw_typespec
] = loc
;
10050 ("both %<long%> and %<float%> in "
10051 "declaration specifiers"));
10052 else if (specs
->short_p
)
10054 ("both %<short%> and %<float%> in "
10055 "declaration specifiers"));
10056 else if (specs
->signed_p
)
10058 ("both %<signed%> and %<float%> in "
10059 "declaration specifiers"));
10060 else if (specs
->unsigned_p
)
10062 ("both %<unsigned%> and %<float%> in "
10063 "declaration specifiers"));
10064 else if (specs
->saturating_p
)
10066 ("both %<_Sat%> and %<float%> in "
10067 "declaration specifiers"));
10070 specs
->typespec_word
= cts_float
;
10071 specs
->locations
[cdw_typespec
] = loc
;
10075 if (specs
->long_long_p
)
10077 ("both %<long long%> and %<double%> in "
10078 "declaration specifiers"));
10079 else if (specs
->short_p
)
10081 ("both %<short%> and %<double%> in "
10082 "declaration specifiers"));
10083 else if (specs
->signed_p
)
10085 ("both %<signed%> and %<double%> in "
10086 "declaration specifiers"));
10087 else if (specs
->unsigned_p
)
10089 ("both %<unsigned%> and %<double%> in "
10090 "declaration specifiers"));
10091 else if (specs
->saturating_p
)
10093 ("both %<_Sat%> and %<double%> in "
10094 "declaration specifiers"));
10097 specs
->typespec_word
= cts_double
;
10098 specs
->locations
[cdw_typespec
] = loc
;
10103 case RID_DFLOAT128
:
10106 if (i
== RID_DFLOAT32
)
10107 str
= "_Decimal32";
10108 else if (i
== RID_DFLOAT64
)
10109 str
= "_Decimal64";
10111 str
= "_Decimal128";
10112 if (specs
->long_long_p
)
10114 ("both %<long long%> and %<%s%> in "
10115 "declaration specifiers"),
10119 ("both %<long%> and %<%s%> in "
10120 "declaration specifiers"),
10122 else if (specs
->short_p
)
10124 ("both %<short%> and %<%s%> in "
10125 "declaration specifiers"),
10127 else if (specs
->signed_p
)
10129 ("both %<signed%> and %<%s%> in "
10130 "declaration specifiers"),
10132 else if (specs
->unsigned_p
)
10134 ("both %<unsigned%> and %<%s%> in "
10135 "declaration specifiers"),
10137 else if (specs
->complex_p
)
10139 ("both %<complex%> and %<%s%> in "
10140 "declaration specifiers"),
10142 else if (specs
->saturating_p
)
10144 ("both %<_Sat%> and %<%s%> in "
10145 "declaration specifiers"),
10147 else if (i
== RID_DFLOAT32
)
10148 specs
->typespec_word
= cts_dfloat32
;
10149 else if (i
== RID_DFLOAT64
)
10150 specs
->typespec_word
= cts_dfloat64
;
10152 specs
->typespec_word
= cts_dfloat128
;
10153 specs
->locations
[cdw_typespec
] = loc
;
10155 if (!targetm
.decimal_float_supported_p ())
10157 ("decimal floating point not supported "
10158 "for this target"));
10159 pedwarn (loc
, OPT_Wpedantic
,
10160 "ISO C does not support decimal floating point");
10166 if (i
== RID_FRACT
)
10170 if (specs
->complex_p
)
10172 ("both %<complex%> and %<%s%> in "
10173 "declaration specifiers"),
10175 else if (i
== RID_FRACT
)
10176 specs
->typespec_word
= cts_fract
;
10178 specs
->typespec_word
= cts_accum
;
10179 specs
->locations
[cdw_typespec
] = loc
;
10181 if (!targetm
.fixed_point_supported_p ())
10183 "fixed-point types not supported for this target");
10184 pedwarn (loc
, OPT_Wpedantic
,
10185 "ISO C does not support fixed-point types");
10188 /* ObjC reserved word "id", handled below. */
10194 /* Now we have a typedef (a TYPE_DECL node), an identifier (some
10195 form of ObjC type, cases such as "int" and "long" being handled
10196 above), a TYPE (struct, union, enum and typeof specifiers) or an
10197 ERROR_MARK. In none of these cases may there have previously
10198 been any type specifiers. */
10199 if (specs
->type
|| specs
->typespec_word
!= cts_none
10200 || specs
->long_p
|| specs
->short_p
|| specs
->signed_p
10201 || specs
->unsigned_p
|| specs
->complex_p
)
10202 error_at (loc
, "two or more data types in declaration specifiers");
10203 else if (TREE_CODE (type
) == TYPE_DECL
)
10205 if (TREE_TYPE (type
) == error_mark_node
)
10206 ; /* Allow the type to default to int to avoid cascading errors. */
10209 specs
->type
= TREE_TYPE (type
);
10210 specs
->decl_attr
= DECL_ATTRIBUTES (type
);
10211 specs
->typedef_p
= true;
10212 specs
->explicit_signed_p
= C_TYPEDEF_EXPLICITLY_SIGNED (type
);
10213 specs
->locations
[cdw_typedef
] = loc
;
10215 /* If this typedef name is defined in a struct, then a C++
10216 lookup would return a different value. */
10217 if (warn_cxx_compat
10218 && I_SYMBOL_BINDING (DECL_NAME (type
))->in_struct
)
10219 warning_at (loc
, OPT_Wc___compat
,
10220 "C++ lookup of %qD would return a field, not a type",
10223 /* If we are parsing a struct, record that a struct field
10225 if (warn_cxx_compat
&& struct_parse_info
!= NULL
)
10226 struct_parse_info
->typedefs_seen
.safe_push (type
);
10229 else if (TREE_CODE (type
) == IDENTIFIER_NODE
)
10231 tree t
= lookup_name (type
);
10232 if (!t
|| TREE_CODE (t
) != TYPE_DECL
)
10233 error_at (loc
, "%qE fails to be a typedef or built in type", type
);
10234 else if (TREE_TYPE (t
) == error_mark_node
)
10238 specs
->type
= TREE_TYPE (t
);
10239 specs
->locations
[cdw_typespec
] = loc
;
10244 if (TREE_CODE (type
) != ERROR_MARK
&& spec
.kind
== ctsk_typeof
)
10246 specs
->typedef_p
= true;
10247 specs
->locations
[cdw_typedef
] = loc
;
10251 specs
->expr
= build2 (COMPOUND_EXPR
, TREE_TYPE (spec
.expr
),
10252 specs
->expr
, spec
.expr
);
10254 specs
->expr
= spec
.expr
;
10255 specs
->expr_const_operands
&= spec
.expr_const_operands
;
10258 specs
->type
= type
;
10264 /* Add the storage class specifier or function specifier SCSPEC to the
10265 declaration specifiers SPECS, returning SPECS. */
10267 struct c_declspecs
*
10268 declspecs_add_scspec (source_location loc
,
10269 struct c_declspecs
*specs
,
10273 enum c_storage_class n
= csc_none
;
10275 specs
->declspecs_seen_p
= true;
10276 gcc_assert (TREE_CODE (scspec
) == IDENTIFIER_NODE
10277 && C_IS_RESERVED_WORD (scspec
));
10278 i
= C_RID_CODE (scspec
);
10279 if (specs
->non_sc_seen_p
)
10280 warning (OPT_Wold_style_declaration
,
10281 "%qE is not at beginning of declaration", scspec
);
10285 /* C99 permits duplicate inline. Although of doubtful utility,
10286 it seems simplest to permit it in gnu89 mode as well, as
10287 there is also little utility in maintaining this as a
10288 difference between gnu89 and C99 inline. */
10290 specs
->inline_p
= true;
10291 specs
->locations
[cdw_inline
] = loc
;
10294 /* Duplicate _Noreturn is permitted. */
10296 specs
->noreturn_p
= true;
10297 specs
->locations
[cdw_noreturn
] = loc
;
10300 dupe
= specs
->thread_p
;
10301 if (specs
->storage_class
== csc_auto
)
10302 error ("%qE used with %<auto%>", scspec
);
10303 else if (specs
->storage_class
== csc_register
)
10304 error ("%qE used with %<register%>", scspec
);
10305 else if (specs
->storage_class
== csc_typedef
)
10306 error ("%qE used with %<typedef%>", scspec
);
10309 specs
->thread_p
= true;
10310 specs
->thread_gnu_p
= (strcmp (IDENTIFIER_POINTER (scspec
),
10312 /* A diagnostic is not required for the use of this
10313 identifier in the implementation namespace; only diagnose
10314 it for the C11 spelling because of existing code using
10315 the other spelling. */
10316 if (!specs
->thread_gnu_p
)
10319 pedwarn_c99 (loc
, OPT_Wpedantic
,
10320 "ISO C99 does not support %qE", scspec
);
10322 pedwarn_c99 (loc
, OPT_Wpedantic
,
10323 "ISO C90 does not support %qE", scspec
);
10325 specs
->locations
[cdw_thread
] = loc
;
10333 /* Diagnose "__thread extern". */
10334 if (specs
->thread_p
&& specs
->thread_gnu_p
)
10335 error ("%<__thread%> before %<extern%>");
10342 /* Diagnose "__thread static". */
10343 if (specs
->thread_p
&& specs
->thread_gnu_p
)
10344 error ("%<__thread%> before %<static%>");
10350 gcc_unreachable ();
10352 if (n
!= csc_none
&& n
== specs
->storage_class
)
10356 if (i
== RID_THREAD
)
10357 error ("duplicate %<_Thread_local%> or %<__thread%>");
10359 error ("duplicate %qE", scspec
);
10363 if (specs
->storage_class
!= csc_none
&& n
!= specs
->storage_class
)
10365 error ("multiple storage classes in declaration specifiers");
10369 specs
->storage_class
= n
;
10370 specs
->locations
[cdw_storage_class
] = loc
;
10371 if (n
!= csc_extern
&& n
!= csc_static
&& specs
->thread_p
)
10373 error ("%qs used with %qE",
10374 specs
->thread_gnu_p
? "__thread" : "_Thread_local",
10376 specs
->thread_p
= false;
10383 /* Add the attributes ATTRS to the declaration specifiers SPECS,
10384 returning SPECS. */
10386 struct c_declspecs
*
10387 declspecs_add_attrs (source_location loc
, struct c_declspecs
*specs
, tree attrs
)
10389 specs
->attrs
= chainon (attrs
, specs
->attrs
);
10390 specs
->locations
[cdw_attributes
] = loc
;
10391 specs
->declspecs_seen_p
= true;
10395 /* Add an _Alignas specifier (expression ALIGN, or type whose
10396 alignment is ALIGN) to the declaration specifiers SPECS, returning
10398 struct c_declspecs
*
10399 declspecs_add_alignas (source_location loc
,
10400 struct c_declspecs
*specs
, tree align
)
10403 specs
->alignas_p
= true;
10404 specs
->locations
[cdw_alignas
] = loc
;
10405 if (align
== error_mark_node
)
10407 align_log
= check_user_alignment (align
, true);
10408 if (align_log
> specs
->align_log
)
10409 specs
->align_log
= align_log
;
10413 /* Combine "long", "short", "signed", "unsigned" and "_Complex" type
10414 specifiers with any other type specifier to determine the resulting
10415 type. This is where ISO C checks on complex types are made, since
10416 "_Complex long" is a prefix of the valid ISO C type "_Complex long
10419 struct c_declspecs
*
10420 finish_declspecs (struct c_declspecs
*specs
)
10422 /* If a type was specified as a whole, we have no modifiers and are
10424 if (specs
->type
!= NULL_TREE
)
10426 gcc_assert (!specs
->long_p
&& !specs
->long_long_p
&& !specs
->short_p
10427 && !specs
->signed_p
&& !specs
->unsigned_p
10428 && !specs
->complex_p
);
10430 /* Set a dummy type. */
10431 if (TREE_CODE (specs
->type
) == ERROR_MARK
)
10432 specs
->type
= integer_type_node
;
10436 /* If none of "void", "_Bool", "char", "int", "float" or "double"
10437 has been specified, treat it as "int" unless "_Complex" is
10438 present and there are no other specifiers. If we just have
10439 "_Complex", it is equivalent to "_Complex double", but e.g.
10440 "_Complex short" is equivalent to "_Complex short int". */
10441 if (specs
->typespec_word
== cts_none
)
10443 if (specs
->saturating_p
)
10445 error_at (specs
->locations
[cdw_saturating
],
10446 "%<_Sat%> is used without %<_Fract%> or %<_Accum%>");
10447 if (!targetm
.fixed_point_supported_p ())
10448 error_at (specs
->locations
[cdw_saturating
],
10449 "fixed-point types not supported for this target");
10450 specs
->typespec_word
= cts_fract
;
10452 else if (specs
->long_p
|| specs
->short_p
10453 || specs
->signed_p
|| specs
->unsigned_p
)
10455 specs
->typespec_word
= cts_int
;
10457 else if (specs
->complex_p
)
10459 specs
->typespec_word
= cts_double
;
10460 pedwarn (specs
->locations
[cdw_complex
], OPT_Wpedantic
,
10461 "ISO C does not support plain %<complex%> meaning "
10462 "%<double complex%>");
10466 specs
->typespec_word
= cts_int
;
10467 specs
->default_int_p
= true;
10468 /* We don't diagnose this here because grokdeclarator will
10469 give more specific diagnostics according to whether it is
10470 a function definition. */
10474 /* If "signed" was specified, record this to distinguish "int" and
10475 "signed int" in the case of a bit-field with
10476 -funsigned-bitfields. */
10477 specs
->explicit_signed_p
= specs
->signed_p
;
10479 /* Now compute the actual type. */
10480 switch (specs
->typespec_word
)
10482 case cts_auto_type
:
10483 gcc_assert (!specs
->long_p
&& !specs
->short_p
10484 && !specs
->signed_p
&& !specs
->unsigned_p
10485 && !specs
->complex_p
);
10486 /* Type to be filled in later. */
10489 gcc_assert (!specs
->long_p
&& !specs
->short_p
10490 && !specs
->signed_p
&& !specs
->unsigned_p
10491 && !specs
->complex_p
);
10492 specs
->type
= void_type_node
;
10495 gcc_assert (!specs
->long_p
&& !specs
->short_p
10496 && !specs
->signed_p
&& !specs
->unsigned_p
10497 && !specs
->complex_p
);
10498 specs
->type
= boolean_type_node
;
10501 gcc_assert (!specs
->long_p
&& !specs
->short_p
);
10502 gcc_assert (!(specs
->signed_p
&& specs
->unsigned_p
));
10503 if (specs
->signed_p
)
10504 specs
->type
= signed_char_type_node
;
10505 else if (specs
->unsigned_p
)
10506 specs
->type
= unsigned_char_type_node
;
10508 specs
->type
= char_type_node
;
10509 if (specs
->complex_p
)
10511 pedwarn (specs
->locations
[cdw_complex
], OPT_Wpedantic
,
10512 "ISO C does not support complex integer types");
10513 specs
->type
= build_complex_type (specs
->type
);
10517 gcc_assert (!specs
->long_p
&& !specs
->short_p
&& !specs
->long_long_p
);
10518 gcc_assert (!(specs
->signed_p
&& specs
->unsigned_p
));
10519 specs
->type
= (specs
->unsigned_p
10520 ? int_n_trees
[specs
->int_n_idx
].unsigned_type
10521 : int_n_trees
[specs
->int_n_idx
].signed_type
);
10522 if (specs
->complex_p
)
10524 pedwarn (specs
->locations
[cdw_complex
], OPT_Wpedantic
,
10525 "ISO C does not support complex integer types");
10526 specs
->type
= build_complex_type (specs
->type
);
10530 gcc_assert (!(specs
->long_p
&& specs
->short_p
));
10531 gcc_assert (!(specs
->signed_p
&& specs
->unsigned_p
));
10532 if (specs
->long_long_p
)
10533 specs
->type
= (specs
->unsigned_p
10534 ? long_long_unsigned_type_node
10535 : long_long_integer_type_node
);
10536 else if (specs
->long_p
)
10537 specs
->type
= (specs
->unsigned_p
10538 ? long_unsigned_type_node
10539 : long_integer_type_node
);
10540 else if (specs
->short_p
)
10541 specs
->type
= (specs
->unsigned_p
10542 ? short_unsigned_type_node
10543 : short_integer_type_node
);
10545 specs
->type
= (specs
->unsigned_p
10546 ? unsigned_type_node
10547 : integer_type_node
);
10548 if (specs
->complex_p
)
10550 pedwarn (specs
->locations
[cdw_complex
], OPT_Wpedantic
,
10551 "ISO C does not support complex integer types");
10552 specs
->type
= build_complex_type (specs
->type
);
10556 gcc_assert (!specs
->long_p
&& !specs
->short_p
10557 && !specs
->signed_p
&& !specs
->unsigned_p
);
10558 specs
->type
= (specs
->complex_p
10559 ? complex_float_type_node
10560 : float_type_node
);
10563 gcc_assert (!specs
->long_long_p
&& !specs
->short_p
10564 && !specs
->signed_p
&& !specs
->unsigned_p
);
10567 specs
->type
= (specs
->complex_p
10568 ? complex_long_double_type_node
10569 : long_double_type_node
);
10573 specs
->type
= (specs
->complex_p
10574 ? complex_double_type_node
10575 : double_type_node
);
10580 case cts_dfloat128
:
10581 gcc_assert (!specs
->long_p
&& !specs
->long_long_p
&& !specs
->short_p
10582 && !specs
->signed_p
&& !specs
->unsigned_p
&& !specs
->complex_p
);
10583 if (specs
->typespec_word
== cts_dfloat32
)
10584 specs
->type
= dfloat32_type_node
;
10585 else if (specs
->typespec_word
== cts_dfloat64
)
10586 specs
->type
= dfloat64_type_node
;
10588 specs
->type
= dfloat128_type_node
;
10591 gcc_assert (!specs
->complex_p
);
10592 if (!targetm
.fixed_point_supported_p ())
10593 specs
->type
= integer_type_node
;
10594 else if (specs
->saturating_p
)
10596 if (specs
->long_long_p
)
10597 specs
->type
= specs
->unsigned_p
10598 ? sat_unsigned_long_long_fract_type_node
10599 : sat_long_long_fract_type_node
;
10600 else if (specs
->long_p
)
10601 specs
->type
= specs
->unsigned_p
10602 ? sat_unsigned_long_fract_type_node
10603 : sat_long_fract_type_node
;
10604 else if (specs
->short_p
)
10605 specs
->type
= specs
->unsigned_p
10606 ? sat_unsigned_short_fract_type_node
10607 : sat_short_fract_type_node
;
10609 specs
->type
= specs
->unsigned_p
10610 ? sat_unsigned_fract_type_node
10611 : sat_fract_type_node
;
10615 if (specs
->long_long_p
)
10616 specs
->type
= specs
->unsigned_p
10617 ? unsigned_long_long_fract_type_node
10618 : long_long_fract_type_node
;
10619 else if (specs
->long_p
)
10620 specs
->type
= specs
->unsigned_p
10621 ? unsigned_long_fract_type_node
10622 : long_fract_type_node
;
10623 else if (specs
->short_p
)
10624 specs
->type
= specs
->unsigned_p
10625 ? unsigned_short_fract_type_node
10626 : short_fract_type_node
;
10628 specs
->type
= specs
->unsigned_p
10629 ? unsigned_fract_type_node
10634 gcc_assert (!specs
->complex_p
);
10635 if (!targetm
.fixed_point_supported_p ())
10636 specs
->type
= integer_type_node
;
10637 else if (specs
->saturating_p
)
10639 if (specs
->long_long_p
)
10640 specs
->type
= specs
->unsigned_p
10641 ? sat_unsigned_long_long_accum_type_node
10642 : sat_long_long_accum_type_node
;
10643 else if (specs
->long_p
)
10644 specs
->type
= specs
->unsigned_p
10645 ? sat_unsigned_long_accum_type_node
10646 : sat_long_accum_type_node
;
10647 else if (specs
->short_p
)
10648 specs
->type
= specs
->unsigned_p
10649 ? sat_unsigned_short_accum_type_node
10650 : sat_short_accum_type_node
;
10652 specs
->type
= specs
->unsigned_p
10653 ? sat_unsigned_accum_type_node
10654 : sat_accum_type_node
;
10658 if (specs
->long_long_p
)
10659 specs
->type
= specs
->unsigned_p
10660 ? unsigned_long_long_accum_type_node
10661 : long_long_accum_type_node
;
10662 else if (specs
->long_p
)
10663 specs
->type
= specs
->unsigned_p
10664 ? unsigned_long_accum_type_node
10665 : long_accum_type_node
;
10666 else if (specs
->short_p
)
10667 specs
->type
= specs
->unsigned_p
10668 ? unsigned_short_accum_type_node
10669 : short_accum_type_node
;
10671 specs
->type
= specs
->unsigned_p
10672 ? unsigned_accum_type_node
10677 gcc_unreachable ();
10683 /* Perform final processing on one file scope's declarations (or the
10684 external scope's declarations), GLOBALS. */
10687 c_write_global_declarations_1 (tree globals
)
10692 /* Process the decls in the order they were written. */
10693 for (decl
= globals
; decl
; decl
= DECL_CHAIN (decl
))
10695 /* Check for used but undefined static functions using the C
10696 standard's definition of "used", and set TREE_NO_WARNING so
10697 that check_global_declaration doesn't repeat the check. */
10698 if (TREE_CODE (decl
) == FUNCTION_DECL
10699 && DECL_INITIAL (decl
) == 0
10700 && DECL_EXTERNAL (decl
)
10701 && !TREE_PUBLIC (decl
)
10702 && C_DECL_USED (decl
))
10704 pedwarn (input_location
, 0, "%q+F used but never defined", decl
);
10705 TREE_NO_WARNING (decl
) = 1;
10708 wrapup_global_declaration_1 (decl
);
10713 reconsider
= false;
10714 for (decl
= globals
; decl
; decl
= DECL_CHAIN (decl
))
10715 reconsider
|= wrapup_global_declaration_2 (decl
);
10717 while (reconsider
);
10720 /* Callback to collect a source_ref from a DECL. */
10723 collect_source_ref_cb (tree decl
)
10725 if (!DECL_IS_BUILTIN (decl
))
10726 collect_source_ref (LOCATION_FILE (decl_sloc (decl
, false)));
10729 /* Preserve the external declarations scope across a garbage collect. */
10730 static GTY(()) tree ext_block
;
10732 /* Collect all references relevant to SOURCE_FILE. */
10735 collect_all_refs (const char *source_file
)
10740 FOR_EACH_VEC_ELT (*all_translation_units
, i
, t
)
10741 collect_ada_nodes (BLOCK_VARS (DECL_INITIAL (t
)), source_file
);
10743 collect_ada_nodes (BLOCK_VARS (ext_block
), source_file
);
10746 /* Iterate over all global declarations and call CALLBACK. */
10749 for_each_global_decl (void (*callback
) (tree decl
))
10756 FOR_EACH_VEC_ELT (*all_translation_units
, i
, t
)
10758 decls
= DECL_INITIAL (t
);
10759 for (decl
= BLOCK_VARS (decls
); decl
; decl
= TREE_CHAIN (decl
))
10763 for (decl
= BLOCK_VARS (ext_block
); decl
; decl
= TREE_CHAIN (decl
))
10767 /* Perform any final parser cleanups and generate initial debugging
10771 c_parse_final_cleanups (void)
10776 /* We don't want to do this if generating a PCH. */
10780 timevar_stop (TV_PHASE_PARSING
);
10781 timevar_start (TV_PHASE_DEFERRED
);
10783 /* Do the Objective-C stuff. This is where all the Objective-C
10784 module stuff gets generated (symtab, class/protocol/selector
10786 if (c_dialect_objc ())
10787 objc_write_global_declarations ();
10789 /* Close the external scope. */
10790 ext_block
= pop_scope ();
10791 external_scope
= 0;
10792 gcc_assert (!current_scope
);
10794 /* Handle -fdump-ada-spec[-slim]. */
10795 if (flag_dump_ada_spec
|| flag_dump_ada_spec_slim
)
10797 /* Build a table of files to generate specs for */
10798 if (flag_dump_ada_spec_slim
)
10799 collect_source_ref (main_input_filename
);
10801 for_each_global_decl (collect_source_ref_cb
);
10803 dump_ada_specs (collect_all_refs
, NULL
);
10808 tree tmp
= BLOCK_VARS (ext_block
);
10810 FILE * stream
= dump_begin (TDI_tu
, &flags
);
10813 dump_node (tmp
, flags
& ~TDF_SLIM
, stream
);
10814 dump_end (TDI_tu
, stream
);
10818 /* Process all file scopes in this compilation, and the external_scope,
10819 through wrapup_global_declarations. */
10820 FOR_EACH_VEC_ELT (*all_translation_units
, i
, t
)
10821 c_write_global_declarations_1 (BLOCK_VARS (DECL_INITIAL (t
)));
10822 c_write_global_declarations_1 (BLOCK_VARS (ext_block
));
10824 timevar_stop (TV_PHASE_DEFERRED
);
10825 timevar_start (TV_PHASE_PARSING
);
10830 /* Register reserved keyword WORD as qualifier for address space AS. */
10833 c_register_addr_space (const char *word
, addr_space_t as
)
10835 int rid
= RID_FIRST_ADDR_SPACE
+ as
;
10838 /* Address space qualifiers are only supported
10839 in C with GNU extensions enabled. */
10840 if (c_dialect_objc () || flag_no_asm
)
10843 id
= get_identifier (word
);
10844 C_SET_RID_CODE (id
, rid
);
10845 C_IS_RESERVED_WORD (id
) = 1;
10846 ridpointers
[rid
] = id
;
10849 /* Return identifier to look up for omp declare reduction. */
10852 c_omp_reduction_id (enum tree_code reduction_code
, tree reduction_id
)
10854 const char *p
= NULL
;
10855 switch (reduction_code
)
10857 case PLUS_EXPR
: p
= "+"; break;
10858 case MULT_EXPR
: p
= "*"; break;
10859 case MINUS_EXPR
: p
= "-"; break;
10860 case BIT_AND_EXPR
: p
= "&"; break;
10861 case BIT_XOR_EXPR
: p
= "^"; break;
10862 case BIT_IOR_EXPR
: p
= "|"; break;
10863 case TRUTH_ANDIF_EXPR
: p
= "&&"; break;
10864 case TRUTH_ORIF_EXPR
: p
= "||"; break;
10865 case MIN_EXPR
: p
= "min"; break;
10866 case MAX_EXPR
: p
= "max"; break;
10873 if (TREE_CODE (reduction_id
) != IDENTIFIER_NODE
)
10874 return error_mark_node
;
10875 p
= IDENTIFIER_POINTER (reduction_id
);
10878 const char prefix
[] = "omp declare reduction ";
10879 size_t lenp
= sizeof (prefix
);
10880 size_t len
= strlen (p
);
10881 char *name
= XALLOCAVEC (char, lenp
+ len
);
10882 memcpy (name
, prefix
, lenp
- 1);
10883 memcpy (name
+ lenp
- 1, p
, len
+ 1);
10884 return get_identifier (name
);
10887 /* Lookup REDUCTION_ID in the current scope, or create an artificial
10888 VAR_DECL, bind it into the current scope and return it. */
10891 c_omp_reduction_decl (tree reduction_id
)
10893 struct c_binding
*b
= I_SYMBOL_BINDING (reduction_id
);
10894 if (b
!= NULL
&& B_IN_CURRENT_SCOPE (b
))
10897 tree decl
= build_decl (BUILTINS_LOCATION
, VAR_DECL
,
10898 reduction_id
, integer_type_node
);
10899 DECL_ARTIFICIAL (decl
) = 1;
10900 DECL_EXTERNAL (decl
) = 1;
10901 TREE_STATIC (decl
) = 1;
10902 TREE_PUBLIC (decl
) = 0;
10903 bind (reduction_id
, decl
, current_scope
, true, false, BUILTINS_LOCATION
);
10907 /* Lookup REDUCTION_ID in the first scope where it has entry for TYPE. */
10910 c_omp_reduction_lookup (tree reduction_id
, tree type
)
10912 struct c_binding
*b
= I_SYMBOL_BINDING (reduction_id
);
10916 for (t
= DECL_INITIAL (b
->decl
); t
; t
= TREE_CHAIN (t
))
10917 if (comptypes (TREE_PURPOSE (t
), type
))
10918 return TREE_VALUE (t
);
10921 return error_mark_node
;
10924 /* Helper function called via walk_tree, to diagnose invalid
10925 #pragma omp declare reduction combiners or initializers. */
10928 c_check_omp_declare_reduction_r (tree
*tp
, int *, void *data
)
10930 tree
*vars
= (tree
*) data
;
10931 if (SSA_VAR_P (*tp
)
10932 && !DECL_ARTIFICIAL (*tp
)
10936 location_t loc
= DECL_SOURCE_LOCATION (vars
[0]);
10937 if (strcmp (IDENTIFIER_POINTER (DECL_NAME (vars
[0])), "omp_out") == 0)
10938 error_at (loc
, "%<#pragma omp declare reduction%> combiner refers to "
10939 "variable %qD which is not %<omp_out%> nor %<omp_in%>",
10942 error_at (loc
, "%<#pragma omp declare reduction%> initializer refers "
10943 "to variable %qD which is not %<omp_priv%> nor "
10951 #include "gt-c-c-decl.h"