1 /* Process declarations and variables for C compiler.
2 Copyright (C) 1988-2015 Free Software Foundation, Inc.
4 This file is part of GCC.
6 GCC is free software; you can redistribute it and/or modify it under
7 the terms of the GNU General Public License as published by the Free
8 Software Foundation; either version 3, or (at your option) any later
11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 You should have received a copy of the GNU General Public License
17 along with GCC; see the file COPYING3. If not see
18 <http://www.gnu.org/licenses/>. */
20 /* Process declarations and symbol lookup for C front end.
21 Also constructs types; the standard scalar types at initialization,
22 and structure, union, array and enum types when they are declared. */
24 /* ??? not all decl nodes are given the most useful possible
25 line numbers. For example, the CONST_DECLs for enum values. */
29 #include "coretypes.h"
38 #include "double-int.h"
42 #include "fold-const.h"
43 #include "print-tree.h"
44 #include "stor-layout.h"
47 #include "stringpool.h"
48 #include "tree-inline.h"
54 #include "hard-reg-set.h"
64 #include "c-family/c-common.h"
65 #include "c-family/c-objc.h"
66 #include "c-family/c-pragma.h"
67 #include "c-family/c-ubsan.h"
69 #include "langhooks.h"
70 #include "tree-iterator.h"
71 #include "diagnostic-core.h"
75 #include "plugin-api.h"
78 #include "hash-table.h"
79 #include "langhooks-def.h"
81 #include "c-family/c-ada-spec.h"
85 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
87 { NORMAL
, /* Ordinary declaration */
88 FUNCDEF
, /* Function definition */
89 PARM
, /* Declaration of parm before function body */
90 FIELD
, /* Declaration inside struct or union */
91 TYPENAME
}; /* Typename (inside cast or sizeof) */
93 /* States indicating how grokdeclarator() should handle declspecs marked
94 with __attribute__((deprecated)). An object declared as
95 __attribute__((deprecated)) suppresses warnings of uses of other
98 enum deprecated_states
{
104 /* Nonzero if we have seen an invalid cross reference
105 to a struct, union, or enum, but not yet printed the message. */
106 tree pending_invalid_xref
;
108 /* File and line to appear in the eventual error message. */
109 location_t pending_invalid_xref_location
;
111 /* The file and line that the prototype came from if this is an
112 old-style definition; used for diagnostics in
113 store_parm_decls_oldstyle. */
115 static location_t current_function_prototype_locus
;
117 /* Whether this prototype was built-in. */
119 static bool current_function_prototype_built_in
;
121 /* The argument type information of this prototype. */
123 static tree current_function_prototype_arg_types
;
125 /* The argument information structure for the function currently being
128 static struct c_arg_info
*current_function_arg_info
;
130 /* The obstack on which parser and related data structures, which are
131 not live beyond their top-level declaration or definition, are
133 struct obstack parser_obstack
;
135 /* The current statement tree. */
137 static GTY(()) struct stmt_tree_s c_stmt_tree
;
139 /* State saving variables. */
143 /* A list of decls to be made automatically visible in each file scope. */
144 static GTY(()) tree visible_builtins
;
146 /* Set to 0 at beginning of a function definition, set to 1 if
147 a return statement that specifies a return value is seen. */
149 int current_function_returns_value
;
151 /* Set to 0 at beginning of a function definition, set to 1 if
152 a return statement with no argument is seen. */
154 int current_function_returns_null
;
156 /* Set to 0 at beginning of a function definition, set to 1 if
157 a call to a noreturn function is seen. */
159 int current_function_returns_abnormally
;
161 /* Set to nonzero by `grokdeclarator' for a function
162 whose return type is defaulted, if warnings for this are desired. */
164 static int warn_about_return_type
;
166 /* Nonzero when the current toplevel function contains a declaration
167 of a nested function which is never defined. */
169 static bool undef_nested_function
;
171 /* If non-zero, implicit "omp declare target" attribute is added into the
173 int current_omp_declare_target_attribute
;
175 /* Each c_binding structure describes one binding of an identifier to
176 a decl. All the decls in a scope - irrespective of namespace - are
177 chained together by the ->prev field, which (as the name implies)
178 runs in reverse order. All the decls in a given namespace bound to
179 a given identifier are chained by the ->shadowed field, which runs
180 from inner to outer scopes.
182 The ->decl field usually points to a DECL node, but there are two
183 exceptions. In the namespace of type tags, the bound entity is a
184 RECORD_TYPE, UNION_TYPE, or ENUMERAL_TYPE node. If an undeclared
185 identifier is encountered, it is bound to error_mark_node to
186 suppress further errors about that identifier in the current
189 The ->u.type field stores the type of the declaration in this scope;
190 if NULL, the type is the type of the ->decl field. This is only of
191 relevance for objects with external or internal linkage which may
192 be redeclared in inner scopes, forming composite types that only
193 persist for the duration of those scopes. In the external scope,
194 this stores the composite of all the types declared for this
195 object, visible or not. The ->inner_comp field (used only at file
196 scope) stores whether an incomplete array type at file scope was
197 completed at an inner scope to an array size other than 1.
199 The ->u.label field is used for labels. It points to a structure
200 which stores additional information used for warnings.
202 The depth field is copied from the scope structure that holds this
203 decl. It is used to preserve the proper ordering of the ->shadowed
204 field (see bind()) and also for a handful of special-case checks.
205 Finally, the invisible bit is true for a decl which should be
206 ignored for purposes of normal name lookup, and the nested bit is
207 true for a decl that's been bound a second time in an inner scope;
208 in all such cases, the binding in the outer scope will have its
209 invisible bit true. */
211 struct GTY((chain_next ("%h.prev"))) c_binding
{
212 union GTY(()) { /* first so GTY desc can use decl */
213 tree
GTY((tag ("0"))) type
; /* the type in this scope */
214 struct c_label_vars
* GTY((tag ("1"))) label
; /* for warnings */
215 } GTY((desc ("TREE_CODE (%0.decl) == LABEL_DECL"))) u
;
216 tree decl
; /* the decl bound */
217 tree id
; /* the identifier it's bound to */
218 struct c_binding
*prev
; /* the previous decl in this scope */
219 struct c_binding
*shadowed
; /* the innermost decl shadowed by this one */
220 unsigned int depth
: 28; /* depth of this scope */
221 BOOL_BITFIELD invisible
: 1; /* normal lookup should ignore this binding */
222 BOOL_BITFIELD nested
: 1; /* do not set DECL_CONTEXT when popping */
223 BOOL_BITFIELD inner_comp
: 1; /* incomplete array completed in inner scope */
224 BOOL_BITFIELD in_struct
: 1; /* currently defined as struct field */
225 location_t locus
; /* location for nested bindings */
227 #define B_IN_SCOPE(b1, b2) ((b1)->depth == (b2)->depth)
228 #define B_IN_CURRENT_SCOPE(b) ((b)->depth == current_scope->depth)
229 #define B_IN_FILE_SCOPE(b) ((b)->depth == 1 /*file_scope->depth*/)
230 #define B_IN_EXTERNAL_SCOPE(b) ((b)->depth == 0 /*external_scope->depth*/)
232 /* Each C symbol points to three linked lists of c_binding structures.
233 These describe the values of the identifier in the three different
234 namespaces defined by the language. */
236 struct GTY(()) lang_identifier
{
237 struct c_common_identifier common_id
;
238 struct c_binding
*symbol_binding
; /* vars, funcs, constants, typedefs */
239 struct c_binding
*tag_binding
; /* struct/union/enum tags */
240 struct c_binding
*label_binding
; /* labels */
243 /* Validate c-lang.c's assumptions. */
244 extern char C_SIZEOF_STRUCT_LANG_IDENTIFIER_isnt_accurate
245 [(sizeof(struct lang_identifier
) == C_SIZEOF_STRUCT_LANG_IDENTIFIER
) ? 1 : -1];
247 /* The binding oracle; see c-tree.h. */
248 void (*c_binding_oracle
) (enum c_oracle_request
, tree identifier
);
250 /* This flag is set on an identifier if we have previously asked the
251 binding oracle for this identifier's symbol binding. */
252 #define I_SYMBOL_CHECKED(node) \
253 (TREE_LANG_FLAG_4 (IDENTIFIER_NODE_CHECK (node)))
255 static inline struct c_binding
* *
256 i_symbol_binding (tree node
)
258 struct lang_identifier
*lid
259 = (struct lang_identifier
*) IDENTIFIER_NODE_CHECK (node
);
261 if (lid
->symbol_binding
== NULL
262 && c_binding_oracle
!= NULL
263 && !I_SYMBOL_CHECKED (node
))
265 /* Set the "checked" flag first, to avoid infinite recursion
266 when the binding oracle calls back into gcc. */
267 I_SYMBOL_CHECKED (node
) = 1;
268 c_binding_oracle (C_ORACLE_SYMBOL
, node
);
271 return &lid
->symbol_binding
;
274 #define I_SYMBOL_BINDING(node) (*i_symbol_binding (node))
276 #define I_SYMBOL_DECL(node) \
277 (I_SYMBOL_BINDING(node) ? I_SYMBOL_BINDING(node)->decl : 0)
279 /* This flag is set on an identifier if we have previously asked the
280 binding oracle for this identifier's tag binding. */
281 #define I_TAG_CHECKED(node) \
282 (TREE_LANG_FLAG_5 (IDENTIFIER_NODE_CHECK (node)))
284 static inline struct c_binding
**
285 i_tag_binding (tree node
)
287 struct lang_identifier
*lid
288 = (struct lang_identifier
*) IDENTIFIER_NODE_CHECK (node
);
290 if (lid
->tag_binding
== NULL
291 && c_binding_oracle
!= NULL
292 && !I_TAG_CHECKED (node
))
294 /* Set the "checked" flag first, to avoid infinite recursion
295 when the binding oracle calls back into gcc. */
296 I_TAG_CHECKED (node
) = 1;
297 c_binding_oracle (C_ORACLE_TAG
, node
);
300 return &lid
->tag_binding
;
303 #define I_TAG_BINDING(node) (*i_tag_binding (node))
305 #define I_TAG_DECL(node) \
306 (I_TAG_BINDING(node) ? I_TAG_BINDING(node)->decl : 0)
308 /* This flag is set on an identifier if we have previously asked the
309 binding oracle for this identifier's label binding. */
310 #define I_LABEL_CHECKED(node) \
311 (TREE_LANG_FLAG_6 (IDENTIFIER_NODE_CHECK (node)))
313 static inline struct c_binding
**
314 i_label_binding (tree node
)
316 struct lang_identifier
*lid
317 = (struct lang_identifier
*) IDENTIFIER_NODE_CHECK (node
);
319 if (lid
->label_binding
== NULL
320 && c_binding_oracle
!= NULL
321 && !I_LABEL_CHECKED (node
))
323 /* Set the "checked" flag first, to avoid infinite recursion
324 when the binding oracle calls back into gcc. */
325 I_LABEL_CHECKED (node
) = 1;
326 c_binding_oracle (C_ORACLE_LABEL
, node
);
329 return &lid
->label_binding
;
332 #define I_LABEL_BINDING(node) (*i_label_binding (node))
334 #define I_LABEL_DECL(node) \
335 (I_LABEL_BINDING(node) ? I_LABEL_BINDING(node)->decl : 0)
337 /* The resulting tree type. */
339 union GTY((desc ("TREE_CODE (&%h.generic) == IDENTIFIER_NODE"),
340 chain_next ("(union lang_tree_node *) c_tree_chain_next (&%h.generic)"))) lang_tree_node
342 union tree_node
GTY ((tag ("0"),
343 desc ("tree_node_structure (&%h)")))
345 struct lang_identifier
GTY ((tag ("1"))) identifier
;
348 /* Track bindings and other things that matter for goto warnings. For
349 efficiency, we do not gather all the decls at the point of
350 definition. Instead, we point into the bindings structure. As
351 scopes are popped, we update these structures and gather the decls
352 that matter at that time. */
354 struct GTY(()) c_spot_bindings
{
355 /* The currently open scope which holds bindings defined when the
356 label was defined or the goto statement was found. */
357 struct c_scope
*scope
;
358 /* The bindings in the scope field which were defined at the point
359 of the label or goto. This lets us look at older or newer
360 bindings in the scope, as appropriate. */
361 struct c_binding
*bindings_in_scope
;
362 /* The number of statement expressions that have started since this
363 label or goto statement was defined. This is zero if we are at
364 the same statement expression level. It is positive if we are in
365 a statement expression started since this spot. It is negative
366 if this spot was in a statement expression and we have left
369 /* Whether we started in a statement expression but are no longer in
370 it. This is set to true if stmt_exprs ever goes negative. */
374 /* This structure is used to keep track of bindings seen when a goto
375 statement is defined. This is only used if we see the goto
376 statement before we see the label. */
378 struct GTY(()) c_goto_bindings
{
379 /* The location of the goto statement. */
381 /* The bindings of the goto statement. */
382 struct c_spot_bindings goto_bindings
;
385 typedef struct c_goto_bindings
*c_goto_bindings_p
;
387 /* The additional information we keep track of for a label binding.
388 These fields are updated as scopes are popped. */
390 struct GTY(()) c_label_vars
{
391 /* The shadowed c_label_vars, when one label shadows another (which
392 can only happen using a __label__ declaration). */
393 struct c_label_vars
*shadowed
;
394 /* The bindings when the label was defined. */
395 struct c_spot_bindings label_bindings
;
396 /* A list of decls that we care about: decls about which we should
397 warn if a goto branches to this label from later in the function.
398 Decls are added to this list as scopes are popped. We only add
399 the decls that matter. */
400 vec
<tree
, va_gc
> *decls_in_scope
;
401 /* A list of goto statements to this label. This is only used for
402 goto statements seen before the label was defined, so that we can
403 issue appropriate warnings for them. */
404 vec
<c_goto_bindings_p
, va_gc
> *gotos
;
407 /* Each c_scope structure describes the complete contents of one
408 scope. Four scopes are distinguished specially: the innermost or
409 current scope, the innermost function scope, the file scope (always
410 the second to outermost) and the outermost or external scope.
412 Most declarations are recorded in the current scope.
414 All normal label declarations are recorded in the innermost
415 function scope, as are bindings of undeclared identifiers to
416 error_mark_node. (GCC permits nested functions as an extension,
417 hence the 'innermost' qualifier.) Explicitly declared labels
418 (using the __label__ extension) appear in the current scope.
420 Being in the file scope (current_scope == file_scope) causes
421 special behavior in several places below. Also, under some
422 conditions the Objective-C front end records declarations in the
423 file scope even though that isn't the current scope.
425 All declarations with external linkage are recorded in the external
426 scope, even if they aren't visible there; this models the fact that
427 such declarations are visible to the entire program, and (with a
428 bit of cleverness, see pushdecl) allows diagnosis of some violations
429 of C99 6.2.2p7 and 6.2.7p2:
431 If, within the same translation unit, the same identifier appears
432 with both internal and external linkage, the behavior is
435 All declarations that refer to the same object or function shall
436 have compatible type; otherwise, the behavior is undefined.
438 Initially only the built-in declarations, which describe compiler
439 intrinsic functions plus a subset of the standard library, are in
442 The order of the blocks list matters, and it is frequently appended
443 to. To avoid having to walk all the way to the end of the list on
444 each insertion, or reverse the list later, we maintain a pointer to
445 the last list entry. (FIXME: It should be feasible to use a reversed
448 The bindings list is strictly in reverse order of declarations;
449 pop_scope relies on this. */
452 struct GTY((chain_next ("%h.outer"))) c_scope
{
453 /* The scope containing this one. */
454 struct c_scope
*outer
;
456 /* The next outermost function scope. */
457 struct c_scope
*outer_function
;
459 /* All bindings in this scope. */
460 struct c_binding
*bindings
;
462 /* For each scope (except the global one), a chain of BLOCK nodes
463 for all the scopes that were entered and exited one level down. */
467 /* The depth of this scope. Used to keep the ->shadowed chain of
468 bindings sorted innermost to outermost. */
469 unsigned int depth
: 28;
471 /* True if we are currently filling this scope with parameter
473 BOOL_BITFIELD parm_flag
: 1;
475 /* True if we saw [*] in this scope. Used to give an error messages
476 if these appears in a function definition. */
477 BOOL_BITFIELD had_vla_unspec
: 1;
479 /* True if we already complained about forward parameter decls
480 in this scope. This prevents double warnings on
481 foo (int a; int b; ...) */
482 BOOL_BITFIELD warned_forward_parm_decls
: 1;
484 /* True if this is the outermost block scope of a function body.
485 This scope contains the parameters, the local variables declared
486 in the outermost block, and all the labels (except those in
487 nested functions, or declared at block scope with __label__). */
488 BOOL_BITFIELD function_body
: 1;
490 /* True means make a BLOCK for this scope no matter what. */
491 BOOL_BITFIELD keep
: 1;
493 /* True means that an unsuffixed float constant is _Decimal64. */
494 BOOL_BITFIELD float_const_decimal64
: 1;
496 /* True if this scope has any label bindings. This is used to speed
497 up searching for labels when popping scopes, particularly since
498 labels are normally only found at function scope. */
499 BOOL_BITFIELD has_label_bindings
: 1;
501 /* True if we should issue a warning if a goto statement crosses any
502 of the bindings. We still need to check the list of bindings to
503 find the specific ones we need to warn about. This is true if
504 decl_jump_unsafe would return true for any of the bindings. This
505 is used to avoid looping over all the bindings unnecessarily. */
506 BOOL_BITFIELD has_jump_unsafe_decl
: 1;
509 /* The scope currently in effect. */
511 static GTY(()) struct c_scope
*current_scope
;
513 /* The innermost function scope. Ordinary (not explicitly declared)
514 labels, bindings to error_mark_node, and the lazily-created
515 bindings of __func__ and its friends get this scope. */
517 static GTY(()) struct c_scope
*current_function_scope
;
519 /* The C file scope. This is reset for each input translation unit. */
521 static GTY(()) struct c_scope
*file_scope
;
523 /* The outermost scope. This is used for all declarations with
524 external linkage, and only these, hence the name. */
526 static GTY(()) struct c_scope
*external_scope
;
528 /* A chain of c_scope structures awaiting reuse. */
530 static GTY((deletable
)) struct c_scope
*scope_freelist
;
532 /* A chain of c_binding structures awaiting reuse. */
534 static GTY((deletable
)) struct c_binding
*binding_freelist
;
536 /* Append VAR to LIST in scope SCOPE. */
537 #define SCOPE_LIST_APPEND(scope, list, decl) do { \
538 struct c_scope *s_ = (scope); \
540 if (s_->list##_last) \
541 BLOCK_CHAIN (s_->list##_last) = d_; \
544 s_->list##_last = d_; \
547 /* Concatenate FROM in scope FSCOPE onto TO in scope TSCOPE. */
548 #define SCOPE_LIST_CONCAT(tscope, to, fscope, from) do { \
549 struct c_scope *t_ = (tscope); \
550 struct c_scope *f_ = (fscope); \
552 BLOCK_CHAIN (t_->to##_last) = f_->from; \
555 t_->to##_last = f_->from##_last; \
558 /* A c_inline_static structure stores details of a static identifier
559 referenced in a definition of a function that may be an inline
560 definition if no subsequent declaration of that function uses
561 "extern" or does not use "inline". */
563 struct GTY((chain_next ("%h.next"))) c_inline_static
{
564 /* The location for a diagnostic. */
567 /* The function that may be an inline definition. */
570 /* The object or function referenced. */
573 /* What sort of reference this is. */
574 enum c_inline_static_type type
;
576 /* The next such structure or NULL. */
577 struct c_inline_static
*next
;
580 /* List of static identifiers used or referenced in functions that may
581 be inline definitions. */
582 static GTY(()) struct c_inline_static
*c_inline_statics
;
584 /* True means unconditionally make a BLOCK for the next scope pushed. */
586 static bool keep_next_level_flag
;
588 /* True means the next call to push_scope will be the outermost scope
589 of a function body, so do not push a new scope, merely cease
590 expecting parameter decls. */
592 static bool next_is_function_body
;
594 /* A vector of pointers to c_binding structures. */
596 typedef struct c_binding
*c_binding_ptr
;
598 /* Information that we keep for a struct or union while it is being
601 struct c_struct_parse_info
603 /* If warn_cxx_compat, a list of types defined within this
605 vec
<tree
> struct_types
;
606 /* If warn_cxx_compat, a list of field names which have bindings,
607 and which are defined in this struct, but which are not defined
608 in any enclosing struct. This is used to clear the in_struct
609 field of the c_bindings structure. */
610 vec
<c_binding_ptr
> fields
;
611 /* If warn_cxx_compat, a list of typedef names used when defining
612 fields in this struct. */
613 vec
<tree
> typedefs_seen
;
616 /* Information for the struct or union currently being parsed, or
617 NULL if not parsing a struct or union. */
618 static struct c_struct_parse_info
*struct_parse_info
;
620 /* Forward declarations. */
621 static tree
lookup_name_in_scope (tree
, struct c_scope
*);
622 static tree
c_make_fname_decl (location_t
, tree
, int);
623 static tree
grokdeclarator (const struct c_declarator
*,
624 struct c_declspecs
*,
625 enum decl_context
, bool, tree
*, tree
*, tree
*,
626 bool *, enum deprecated_states
);
627 static tree
grokparms (struct c_arg_info
*, bool);
628 static void layout_array_type (tree
);
629 static void warn_defaults_to (location_t
, int, const char *, ...)
630 ATTRIBUTE_GCC_DIAG(3,4);
632 /* T is a statement. Add it to the statement-tree. This is the
633 C/ObjC version--C++ has a slightly different version of this
639 enum tree_code code
= TREE_CODE (t
);
641 if (CAN_HAVE_LOCATION_P (t
) && code
!= LABEL_EXPR
)
643 if (!EXPR_HAS_LOCATION (t
))
644 SET_EXPR_LOCATION (t
, input_location
);
647 if (code
== LABEL_EXPR
|| code
== CASE_LABEL_EXPR
)
648 STATEMENT_LIST_HAS_LABEL (cur_stmt_list
) = 1;
650 /* Add T to the statement-tree. Non-side-effect statements need to be
651 recorded during statement expressions. */
652 if (!building_stmt_list_p ())
654 append_to_statement_list_force (t
, &cur_stmt_list
);
659 /* Build a pointer type using the default pointer mode. */
662 c_build_pointer_type (tree to_type
)
664 addr_space_t as
= to_type
== error_mark_node
? ADDR_SPACE_GENERIC
665 : TYPE_ADDR_SPACE (to_type
);
666 machine_mode pointer_mode
;
668 if (as
!= ADDR_SPACE_GENERIC
|| c_default_pointer_mode
== VOIDmode
)
669 pointer_mode
= targetm
.addr_space
.pointer_mode (as
);
671 pointer_mode
= c_default_pointer_mode
;
672 return build_pointer_type_for_mode (to_type
, pointer_mode
, false);
676 /* Return true if we will want to say something if a goto statement
680 decl_jump_unsafe (tree decl
)
682 if (error_operand_p (decl
))
685 /* Always warn about crossing variably modified types. */
686 if ((TREE_CODE (decl
) == VAR_DECL
|| TREE_CODE (decl
) == TYPE_DECL
)
687 && variably_modified_type_p (TREE_TYPE (decl
), NULL_TREE
))
690 /* Otherwise, only warn if -Wgoto-misses-init and this is an
691 initialized automatic decl. */
692 if (warn_jump_misses_init
693 && TREE_CODE (decl
) == VAR_DECL
694 && !TREE_STATIC (decl
)
695 && DECL_INITIAL (decl
) != NULL_TREE
)
703 c_print_identifier (FILE *file
, tree node
, int indent
)
705 void (*save
) (enum c_oracle_request
, tree identifier
);
707 /* Temporarily hide any binding oracle. Without this, calls to
708 debug_tree from the debugger will end up calling into the oracle,
709 making for a confusing debug session. As the oracle isn't needed
710 here for normal operation, it's simplest to suppress it. */
711 save
= c_binding_oracle
;
712 c_binding_oracle
= NULL
;
714 print_node (file
, "symbol", I_SYMBOL_DECL (node
), indent
+ 4);
715 print_node (file
, "tag", I_TAG_DECL (node
), indent
+ 4);
716 print_node (file
, "label", I_LABEL_DECL (node
), indent
+ 4);
717 if (C_IS_RESERVED_WORD (node
) && C_RID_CODE (node
) != RID_CXX_COMPAT_WARN
)
719 tree rid
= ridpointers
[C_RID_CODE (node
)];
720 indent_to (file
, indent
+ 4);
721 fprintf (file
, "rid " HOST_PTR_PRINTF
" \"%s\"",
722 (void *) rid
, IDENTIFIER_POINTER (rid
));
725 c_binding_oracle
= save
;
728 /* Establish a binding between NAME, an IDENTIFIER_NODE, and DECL,
729 which may be any of several kinds of DECL or TYPE or error_mark_node,
730 in the scope SCOPE. */
732 bind (tree name
, tree decl
, struct c_scope
*scope
, bool invisible
,
733 bool nested
, location_t locus
)
735 struct c_binding
*b
, **here
;
737 if (binding_freelist
)
739 b
= binding_freelist
;
740 binding_freelist
= b
->prev
;
743 b
= ggc_alloc
<c_binding
> ();
748 b
->depth
= scope
->depth
;
749 b
->invisible
= invisible
;
757 b
->prev
= scope
->bindings
;
760 if (decl_jump_unsafe (decl
))
761 scope
->has_jump_unsafe_decl
= 1;
766 switch (TREE_CODE (decl
))
768 case LABEL_DECL
: here
= &I_LABEL_BINDING (name
); break;
771 case RECORD_TYPE
: here
= &I_TAG_BINDING (name
); break;
777 case ERROR_MARK
: here
= &I_SYMBOL_BINDING (name
); break;
783 /* Locate the appropriate place in the chain of shadowed decls
784 to insert this binding. Normally, scope == current_scope and
785 this does nothing. */
786 while (*here
&& (*here
)->depth
> scope
->depth
)
787 here
= &(*here
)->shadowed
;
793 /* Clear the binding structure B, stick it on the binding_freelist,
794 and return the former value of b->prev. This is used by pop_scope
795 and get_parm_info to iterate destructively over all the bindings
796 from a given scope. */
797 static struct c_binding
*
798 free_binding_and_advance (struct c_binding
*b
)
800 struct c_binding
*prev
= b
->prev
;
802 memset (b
, 0, sizeof (struct c_binding
));
803 b
->prev
= binding_freelist
;
804 binding_freelist
= b
;
809 /* Bind a label. Like bind, but skip fields which aren't used for
810 labels, and add the LABEL_VARS value. */
812 bind_label (tree name
, tree label
, struct c_scope
*scope
,
813 struct c_label_vars
*label_vars
)
817 bind (name
, label
, scope
, /*invisible=*/false, /*nested=*/false,
820 scope
->has_label_bindings
= true;
823 gcc_assert (b
->decl
== label
);
824 label_vars
->shadowed
= b
->u
.label
;
825 b
->u
.label
= label_vars
;
828 /* Hook called at end of compilation to assume 1 elt
829 for a file-scope tentative array defn that wasn't complete before. */
832 c_finish_incomplete_decl (tree decl
)
834 if (TREE_CODE (decl
) == VAR_DECL
)
836 tree type
= TREE_TYPE (decl
);
837 if (type
!= error_mark_node
838 && TREE_CODE (type
) == ARRAY_TYPE
839 && !DECL_EXTERNAL (decl
)
840 && TYPE_DOMAIN (type
) == 0)
842 warning_at (DECL_SOURCE_LOCATION (decl
),
843 0, "array %q+D assumed to have one element", decl
);
845 complete_array_type (&TREE_TYPE (decl
), NULL_TREE
, true);
847 relayout_decl (decl
);
852 /* Record that inline function FUNC contains a reference (location
853 LOC) to static DECL (file-scope or function-local according to
857 record_inline_static (location_t loc
, tree func
, tree decl
,
858 enum c_inline_static_type type
)
860 c_inline_static
*csi
= ggc_alloc
<c_inline_static
> ();
862 csi
->function
= func
;
863 csi
->static_decl
= decl
;
865 csi
->next
= c_inline_statics
;
866 c_inline_statics
= csi
;
869 /* Check for references to static declarations in inline functions at
870 the end of the translation unit and diagnose them if the functions
871 are still inline definitions. */
874 check_inline_statics (void)
876 struct c_inline_static
*csi
;
877 for (csi
= c_inline_statics
; csi
; csi
= csi
->next
)
879 if (DECL_EXTERNAL (csi
->function
))
883 pedwarn (csi
->location
, 0,
884 "%qD is static but used in inline function %qD "
885 "which is not static", csi
->static_decl
, csi
->function
);
888 pedwarn (csi
->location
, 0,
889 "%q+D is static but declared in inline function %qD "
890 "which is not static", csi
->static_decl
, csi
->function
);
896 c_inline_statics
= NULL
;
899 /* Fill in a c_spot_bindings structure. If DEFINING is true, set it
900 for the current state, otherwise set it to uninitialized. */
903 set_spot_bindings (struct c_spot_bindings
*p
, bool defining
)
907 p
->scope
= current_scope
;
908 p
->bindings_in_scope
= current_scope
->bindings
;
913 p
->bindings_in_scope
= NULL
;
916 p
->left_stmt_expr
= false;
919 /* Update spot bindings P as we pop out of SCOPE. Return true if we
920 should push decls for a label. */
923 update_spot_bindings (struct c_scope
*scope
, struct c_spot_bindings
*p
)
925 if (p
->scope
!= scope
)
927 /* This label or goto is defined in some other scope, or it is a
928 label which is not yet defined. There is nothing to
933 /* Adjust the spot bindings to refer to the bindings already defined
934 in the enclosing scope. */
935 p
->scope
= scope
->outer
;
936 p
->bindings_in_scope
= p
->scope
->bindings
;
941 /* The Objective-C front-end often needs to determine the current scope. */
944 objc_get_current_scope (void)
946 return current_scope
;
949 /* The following function is used only by Objective-C. It needs to live here
950 because it accesses the innards of c_scope. */
953 objc_mark_locals_volatile (void *enclosing_blk
)
955 struct c_scope
*scope
;
958 for (scope
= current_scope
;
959 scope
&& scope
!= enclosing_blk
;
960 scope
= scope
->outer
)
962 for (b
= scope
->bindings
; b
; b
= b
->prev
)
963 objc_volatilize_decl (b
->decl
);
965 /* Do not climb up past the current function. */
966 if (scope
->function_body
)
971 /* Return true if we are in the global binding level. */
974 global_bindings_p (void)
976 return current_scope
== file_scope
;
980 keep_next_level (void)
982 keep_next_level_flag
= true;
985 /* Set the flag for the FLOAT_CONST_DECIMAL64 pragma being ON. */
988 set_float_const_decimal64 (void)
990 current_scope
->float_const_decimal64
= true;
993 /* Clear the flag for the FLOAT_CONST_DECIMAL64 pragma. */
996 clear_float_const_decimal64 (void)
998 current_scope
->float_const_decimal64
= false;
1001 /* Return nonzero if an unsuffixed float constant is _Decimal64. */
1004 float_const_decimal64_p (void)
1006 return current_scope
->float_const_decimal64
;
1009 /* Identify this scope as currently being filled with parameters. */
1012 declare_parm_level (void)
1014 current_scope
->parm_flag
= true;
1020 if (next_is_function_body
)
1022 /* This is the transition from the parameters to the top level
1023 of the function body. These are the same scope
1024 (C99 6.2.1p4,6) so we do not push another scope structure.
1025 next_is_function_body is set only by store_parm_decls, which
1026 in turn is called when and only when we are about to
1027 encounter the opening curly brace for the function body.
1029 The outermost block of a function always gets a BLOCK node,
1030 because the debugging output routines expect that each
1031 function has at least one BLOCK. */
1032 current_scope
->parm_flag
= false;
1033 current_scope
->function_body
= true;
1034 current_scope
->keep
= true;
1035 current_scope
->outer_function
= current_function_scope
;
1036 current_function_scope
= current_scope
;
1038 keep_next_level_flag
= false;
1039 next_is_function_body
= false;
1041 /* The FLOAT_CONST_DECIMAL64 pragma applies to nested scopes. */
1042 if (current_scope
->outer
)
1043 current_scope
->float_const_decimal64
1044 = current_scope
->outer
->float_const_decimal64
;
1046 current_scope
->float_const_decimal64
= false;
1050 struct c_scope
*scope
;
1053 scope
= scope_freelist
;
1054 scope_freelist
= scope
->outer
;
1057 scope
= ggc_cleared_alloc
<c_scope
> ();
1059 /* The FLOAT_CONST_DECIMAL64 pragma applies to nested scopes. */
1061 scope
->float_const_decimal64
= current_scope
->float_const_decimal64
;
1063 scope
->float_const_decimal64
= false;
1065 scope
->keep
= keep_next_level_flag
;
1066 scope
->outer
= current_scope
;
1067 scope
->depth
= current_scope
? (current_scope
->depth
+ 1) : 0;
1069 /* Check for scope depth overflow. Unlikely (2^28 == 268,435,456) but
1071 if (current_scope
&& scope
->depth
== 0)
1074 sorry ("GCC supports only %u nested scopes", scope
->depth
);
1077 current_scope
= scope
;
1078 keep_next_level_flag
= false;
1082 /* This is called when we are leaving SCOPE. For each label defined
1083 in SCOPE, add any appropriate decls to its decls_in_scope fields.
1084 These are the decls whose initialization will be skipped by a goto
1085 later in the function. */
1088 update_label_decls (struct c_scope
*scope
)
1095 if (s
->has_label_bindings
)
1097 struct c_binding
*b
;
1099 for (b
= s
->bindings
; b
!= NULL
; b
= b
->prev
)
1101 struct c_label_vars
*label_vars
;
1102 struct c_binding
*b1
;
1105 struct c_goto_bindings
*g
;
1107 if (TREE_CODE (b
->decl
) != LABEL_DECL
)
1109 label_vars
= b
->u
.label
;
1111 b1
= label_vars
->label_bindings
.bindings_in_scope
;
1112 if (label_vars
->label_bindings
.scope
== NULL
)
1115 hjud
= label_vars
->label_bindings
.scope
->has_jump_unsafe_decl
;
1116 if (update_spot_bindings (scope
, &label_vars
->label_bindings
))
1118 /* This label is defined in this scope. */
1121 for (; b1
!= NULL
; b1
= b1
->prev
)
1123 /* A goto from later in the function to this
1124 label will never see the initialization
1125 of B1, if any. Save it to issue a
1126 warning if needed. */
1127 if (decl_jump_unsafe (b1
->decl
))
1128 vec_safe_push(label_vars
->decls_in_scope
, b1
->decl
);
1133 /* Update the bindings of any goto statements associated
1135 FOR_EACH_VEC_SAFE_ELT (label_vars
->gotos
, ix
, g
)
1136 update_spot_bindings (scope
, &g
->goto_bindings
);
1140 /* Don't search beyond the current function. */
1141 if (s
== current_function_scope
)
1148 /* Set the TYPE_CONTEXT of all of TYPE's variants to CONTEXT. */
1151 set_type_context (tree type
, tree context
)
1153 for (type
= TYPE_MAIN_VARIANT (type
); type
;
1154 type
= TYPE_NEXT_VARIANT (type
))
1155 TYPE_CONTEXT (type
) = context
;
1158 /* Exit a scope. Restore the state of the identifier-decl mappings
1159 that were in effect when this scope was entered. Return a BLOCK
1160 node containing all the DECLs in this scope that are of interest
1161 to debug info generation. */
1166 struct c_scope
*scope
= current_scope
;
1167 tree block
, context
, p
;
1168 struct c_binding
*b
;
1170 bool functionbody
= scope
->function_body
;
1171 bool keep
= functionbody
|| scope
->keep
|| scope
->bindings
;
1173 update_label_decls (scope
);
1175 /* If appropriate, create a BLOCK to record the decls for the life
1176 of this function. */
1180 block
= make_node (BLOCK
);
1181 BLOCK_SUBBLOCKS (block
) = scope
->blocks
;
1182 TREE_USED (block
) = 1;
1184 /* In each subblock, record that this is its superior. */
1185 for (p
= scope
->blocks
; p
; p
= BLOCK_CHAIN (p
))
1186 BLOCK_SUPERCONTEXT (p
) = block
;
1188 BLOCK_VARS (block
) = 0;
1191 /* The TYPE_CONTEXTs for all of the tagged types belonging to this
1192 scope must be set so that they point to the appropriate
1193 construct, i.e. either to the current FUNCTION_DECL node, or
1194 else to the BLOCK node we just constructed.
1196 Note that for tagged types whose scope is just the formal
1197 parameter list for some function type specification, we can't
1198 properly set their TYPE_CONTEXTs here, because we don't have a
1199 pointer to the appropriate FUNCTION_TYPE node readily available
1200 to us. For those cases, the TYPE_CONTEXTs of the relevant tagged
1201 type nodes get set in `grokdeclarator' as soon as we have created
1202 the FUNCTION_TYPE node which will represent the "scope" for these
1203 "parameter list local" tagged types. */
1204 if (scope
->function_body
)
1205 context
= current_function_decl
;
1206 else if (scope
== file_scope
)
1208 tree file_decl
= build_translation_unit_decl (NULL_TREE
);
1209 context
= file_decl
;
1214 /* Clear all bindings in this scope. */
1215 for (b
= scope
->bindings
; b
; b
= free_binding_and_advance (b
))
1218 switch (TREE_CODE (p
))
1221 /* Warnings for unused labels, errors for undefined labels. */
1222 if (TREE_USED (p
) && !DECL_INITIAL (p
))
1224 error ("label %q+D used but not defined", p
);
1225 DECL_INITIAL (p
) = error_mark_node
;
1228 warn_for_unused_label (p
);
1230 /* Labels go in BLOCK_VARS. */
1231 DECL_CHAIN (p
) = BLOCK_VARS (block
);
1232 BLOCK_VARS (block
) = p
;
1233 gcc_assert (I_LABEL_BINDING (b
->id
) == b
);
1234 I_LABEL_BINDING (b
->id
) = b
->shadowed
;
1236 /* Also pop back to the shadowed label_vars. */
1237 release_tree_vector (b
->u
.label
->decls_in_scope
);
1238 b
->u
.label
= b
->u
.label
->shadowed
;
1244 set_type_context (p
, context
);
1246 /* Types may not have tag-names, in which case the type
1247 appears in the bindings list with b->id NULL. */
1250 gcc_assert (I_TAG_BINDING (b
->id
) == b
);
1251 I_TAG_BINDING (b
->id
) = b
->shadowed
;
1256 /* Propagate TREE_ADDRESSABLE from nested functions to their
1257 containing functions. */
1258 if (!TREE_ASM_WRITTEN (p
)
1259 && DECL_INITIAL (p
) != 0
1260 && TREE_ADDRESSABLE (p
)
1261 && DECL_ABSTRACT_ORIGIN (p
) != 0
1262 && DECL_ABSTRACT_ORIGIN (p
) != p
)
1263 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (p
)) = 1;
1264 if (!DECL_EXTERNAL (p
)
1265 && !DECL_INITIAL (p
)
1266 && scope
!= file_scope
1267 && scope
!= external_scope
)
1269 error ("nested function %q+D declared but never defined", p
);
1270 undef_nested_function
= true;
1272 else if (DECL_DECLARED_INLINE_P (p
)
1274 && !DECL_INITIAL (p
))
1276 /* C99 6.7.4p6: "a function with external linkage... declared
1277 with an inline function specifier ... shall also be defined
1278 in the same translation unit." */
1279 if (!flag_gnu89_inline
1280 && !lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (p
))
1281 && scope
!= external_scope
)
1282 pedwarn (input_location
, 0,
1283 "inline function %q+D declared but never defined", p
);
1284 DECL_EXTERNAL (p
) = 1;
1290 /* Warnings for unused variables. */
1291 if ((!TREE_USED (p
) || !DECL_READ_P (p
))
1292 && !TREE_NO_WARNING (p
)
1293 && !DECL_IN_SYSTEM_HEADER (p
)
1295 && !DECL_ARTIFICIAL (p
)
1296 && scope
!= file_scope
1297 && scope
!= external_scope
)
1300 warning (OPT_Wunused_variable
, "unused variable %q+D", p
);
1301 else if (DECL_CONTEXT (p
) == current_function_decl
)
1302 warning_at (DECL_SOURCE_LOCATION (p
),
1303 OPT_Wunused_but_set_variable
,
1304 "variable %qD set but not used", p
);
1309 error ("type of array %q+D completed incompatibly with"
1310 " implicit initialization", p
);
1317 /* All of these go in BLOCK_VARS, but only if this is the
1318 binding in the home scope. */
1321 DECL_CHAIN (p
) = BLOCK_VARS (block
);
1322 BLOCK_VARS (block
) = p
;
1324 else if (VAR_OR_FUNCTION_DECL_P (p
) && scope
!= file_scope
)
1326 /* For block local externs add a special
1327 DECL_EXTERNAL decl for debug info generation. */
1328 tree extp
= copy_node (p
);
1330 DECL_EXTERNAL (extp
) = 1;
1331 TREE_STATIC (extp
) = 0;
1332 TREE_PUBLIC (extp
) = 1;
1333 DECL_INITIAL (extp
) = NULL_TREE
;
1334 DECL_LANG_SPECIFIC (extp
) = NULL
;
1335 DECL_CONTEXT (extp
) = current_function_decl
;
1336 if (TREE_CODE (p
) == FUNCTION_DECL
)
1338 DECL_RESULT (extp
) = NULL_TREE
;
1339 DECL_SAVED_TREE (extp
) = NULL_TREE
;
1340 DECL_STRUCT_FUNCTION (extp
) = NULL
;
1342 if (b
->locus
!= UNKNOWN_LOCATION
)
1343 DECL_SOURCE_LOCATION (extp
) = b
->locus
;
1344 DECL_CHAIN (extp
) = BLOCK_VARS (block
);
1345 BLOCK_VARS (block
) = extp
;
1347 /* If this is the file scope set DECL_CONTEXT of each decl to
1348 the TRANSLATION_UNIT_DECL. This makes same_translation_unit_p
1350 if (scope
== file_scope
)
1352 DECL_CONTEXT (p
) = context
;
1353 if (TREE_CODE (p
) == TYPE_DECL
1354 && TREE_TYPE (p
) != error_mark_node
)
1355 set_type_context (TREE_TYPE (p
), context
);
1359 /* Parameters go in DECL_ARGUMENTS, not BLOCK_VARS, and have
1360 already been put there by store_parm_decls. Unused-
1361 parameter warnings are handled by function.c.
1362 error_mark_node obviously does not go in BLOCK_VARS and
1363 does not get unused-variable warnings. */
1366 /* It is possible for a decl not to have a name. We get
1367 here with b->id NULL in this case. */
1370 gcc_assert (I_SYMBOL_BINDING (b
->id
) == b
);
1371 I_SYMBOL_BINDING (b
->id
) = b
->shadowed
;
1372 if (b
->shadowed
&& b
->shadowed
->u
.type
)
1373 TREE_TYPE (b
->shadowed
->decl
) = b
->shadowed
->u
.type
;
1383 /* Dispose of the block that we just made inside some higher level. */
1384 if ((scope
->function_body
|| scope
== file_scope
) && context
)
1386 DECL_INITIAL (context
) = block
;
1387 BLOCK_SUPERCONTEXT (block
) = context
;
1389 else if (scope
->outer
)
1392 SCOPE_LIST_APPEND (scope
->outer
, blocks
, block
);
1393 /* If we did not make a block for the scope just exited, any
1394 blocks made for inner scopes must be carried forward so they
1395 will later become subblocks of something else. */
1396 else if (scope
->blocks
)
1397 SCOPE_LIST_CONCAT (scope
->outer
, blocks
, scope
, blocks
);
1400 /* Pop the current scope, and free the structure for reuse. */
1401 current_scope
= scope
->outer
;
1402 if (scope
->function_body
)
1403 current_function_scope
= scope
->outer_function
;
1405 memset (scope
, 0, sizeof (struct c_scope
));
1406 scope
->outer
= scope_freelist
;
1407 scope_freelist
= scope
;
1413 push_file_scope (void)
1421 file_scope
= current_scope
;
1423 start_fname_decls ();
1425 for (decl
= visible_builtins
; decl
; decl
= DECL_CHAIN (decl
))
1426 bind (DECL_NAME (decl
), decl
, file_scope
,
1427 /*invisible=*/false, /*nested=*/true, DECL_SOURCE_LOCATION (decl
));
1431 pop_file_scope (void)
1433 /* In case there were missing closebraces, get us back to the global
1435 while (current_scope
!= file_scope
)
1438 /* __FUNCTION__ is defined at file scope (""). This
1439 call may not be necessary as my tests indicate it
1440 still works without it. */
1441 finish_fname_decls ();
1443 check_inline_statics ();
1445 /* This is the point to write out a PCH if we're doing that.
1446 In that case we do not want to do anything else. */
1449 c_common_write_pch ();
1453 /* Pop off the file scope and close this translation unit. */
1457 maybe_apply_pending_pragma_weaks ();
1460 /* Adjust the bindings for the start of a statement expression. */
1463 c_bindings_start_stmt_expr (struct c_spot_bindings
* switch_bindings
)
1465 struct c_scope
*scope
;
1467 for (scope
= current_scope
; scope
!= NULL
; scope
= scope
->outer
)
1469 struct c_binding
*b
;
1471 if (!scope
->has_label_bindings
)
1474 for (b
= scope
->bindings
; b
!= NULL
; b
= b
->prev
)
1476 struct c_label_vars
*label_vars
;
1478 struct c_goto_bindings
*g
;
1480 if (TREE_CODE (b
->decl
) != LABEL_DECL
)
1482 label_vars
= b
->u
.label
;
1483 ++label_vars
->label_bindings
.stmt_exprs
;
1484 FOR_EACH_VEC_SAFE_ELT (label_vars
->gotos
, ix
, g
)
1485 ++g
->goto_bindings
.stmt_exprs
;
1489 if (switch_bindings
!= NULL
)
1490 ++switch_bindings
->stmt_exprs
;
1493 /* Adjust the bindings for the end of a statement expression. */
1496 c_bindings_end_stmt_expr (struct c_spot_bindings
*switch_bindings
)
1498 struct c_scope
*scope
;
1500 for (scope
= current_scope
; scope
!= NULL
; scope
= scope
->outer
)
1502 struct c_binding
*b
;
1504 if (!scope
->has_label_bindings
)
1507 for (b
= scope
->bindings
; b
!= NULL
; b
= b
->prev
)
1509 struct c_label_vars
*label_vars
;
1511 struct c_goto_bindings
*g
;
1513 if (TREE_CODE (b
->decl
) != LABEL_DECL
)
1515 label_vars
= b
->u
.label
;
1516 --label_vars
->label_bindings
.stmt_exprs
;
1517 if (label_vars
->label_bindings
.stmt_exprs
< 0)
1519 label_vars
->label_bindings
.left_stmt_expr
= true;
1520 label_vars
->label_bindings
.stmt_exprs
= 0;
1522 FOR_EACH_VEC_SAFE_ELT (label_vars
->gotos
, ix
, g
)
1524 --g
->goto_bindings
.stmt_exprs
;
1525 if (g
->goto_bindings
.stmt_exprs
< 0)
1527 g
->goto_bindings
.left_stmt_expr
= true;
1528 g
->goto_bindings
.stmt_exprs
= 0;
1534 if (switch_bindings
!= NULL
)
1536 --switch_bindings
->stmt_exprs
;
1537 gcc_assert (switch_bindings
->stmt_exprs
>= 0);
1541 /* Push a definition or a declaration of struct, union or enum tag "name".
1542 "type" should be the type node.
1543 We assume that the tag "name" is not already defined, and has a location
1546 Note that the definition may really be just a forward reference.
1547 In that case, the TYPE_SIZE will be zero. */
1550 pushtag (location_t loc
, tree name
, tree type
)
1552 /* Record the identifier as the type's name if it has none. */
1553 if (name
&& !TYPE_NAME (type
))
1554 TYPE_NAME (type
) = name
;
1555 bind (name
, type
, current_scope
, /*invisible=*/false, /*nested=*/false, loc
);
1557 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1558 tagged type we just added to the current scope. This fake
1559 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1560 to output a representation of a tagged type, and it also gives
1561 us a convenient place to record the "scope start" address for the
1564 TYPE_STUB_DECL (type
) = pushdecl (build_decl (loc
,
1565 TYPE_DECL
, NULL_TREE
, type
));
1567 /* An approximation for now, so we can tell this is a function-scope tag.
1568 This will be updated in pop_scope. */
1569 TYPE_CONTEXT (type
) = DECL_CONTEXT (TYPE_STUB_DECL (type
));
1571 if (warn_cxx_compat
&& name
!= NULL_TREE
)
1573 struct c_binding
*b
= I_SYMBOL_BINDING (name
);
1576 && b
->decl
!= NULL_TREE
1577 && TREE_CODE (b
->decl
) == TYPE_DECL
1578 && (B_IN_CURRENT_SCOPE (b
)
1579 || (current_scope
== file_scope
&& B_IN_EXTERNAL_SCOPE (b
)))
1580 && (TYPE_MAIN_VARIANT (TREE_TYPE (b
->decl
))
1581 != TYPE_MAIN_VARIANT (type
)))
1583 warning_at (loc
, OPT_Wc___compat
,
1584 ("using %qD as both a typedef and a tag is "
1587 if (b
->locus
!= UNKNOWN_LOCATION
)
1588 inform (b
->locus
, "originally defined here");
1593 /* An exported interface to pushtag. This is used by the gdb plugin's
1594 binding oracle to introduce a new tag binding. */
1597 c_pushtag (location_t loc
, tree name
, tree type
)
1599 pushtag (loc
, name
, type
);
1602 /* An exported interface to bind a declaration. LOC is the location
1603 to use. DECL is the declaration to bind. The decl's name is used
1604 to determine how it is bound. If DECL is a VAR_DECL, then
1605 IS_GLOBAL determines whether the decl is put into the global (file
1606 and external) scope or the current function's scope; if DECL is not
1607 a VAR_DECL then it is always put into the file scope. */
1610 c_bind (location_t loc
, tree decl
, bool is_global
)
1612 struct c_scope
*scope
;
1613 bool nested
= false;
1615 if (TREE_CODE (decl
) != VAR_DECL
|| current_function_scope
== NULL
)
1617 /* Types and functions are always considered to be global. */
1619 DECL_EXTERNAL (decl
) = 1;
1620 TREE_PUBLIC (decl
) = 1;
1624 /* Also bind it into the external scope. */
1625 bind (DECL_NAME (decl
), decl
, external_scope
, true, false, loc
);
1628 DECL_EXTERNAL (decl
) = 1;
1629 TREE_PUBLIC (decl
) = 1;
1633 DECL_CONTEXT (decl
) = current_function_decl
;
1634 TREE_PUBLIC (decl
) = 0;
1635 scope
= current_function_scope
;
1638 bind (DECL_NAME (decl
), decl
, scope
, false, nested
, loc
);
1641 /* Subroutine of compare_decls. Allow harmless mismatches in return
1642 and argument types provided that the type modes match. This function
1643 return a unified type given a suitable match, and 0 otherwise. */
1646 match_builtin_function_types (tree newtype
, tree oldtype
)
1648 tree newrettype
, oldrettype
;
1649 tree newargs
, oldargs
;
1650 tree trytype
, tryargs
;
1652 /* Accept the return type of the new declaration if same modes. */
1653 oldrettype
= TREE_TYPE (oldtype
);
1654 newrettype
= TREE_TYPE (newtype
);
1656 if (TYPE_MODE (oldrettype
) != TYPE_MODE (newrettype
))
1659 oldargs
= TYPE_ARG_TYPES (oldtype
);
1660 newargs
= TYPE_ARG_TYPES (newtype
);
1663 while (oldargs
|| newargs
)
1667 || !TREE_VALUE (oldargs
)
1668 || !TREE_VALUE (newargs
)
1669 || TYPE_MODE (TREE_VALUE (oldargs
))
1670 != TYPE_MODE (TREE_VALUE (newargs
)))
1673 oldargs
= TREE_CHAIN (oldargs
);
1674 newargs
= TREE_CHAIN (newargs
);
1677 trytype
= build_function_type (newrettype
, tryargs
);
1678 return build_type_attribute_variant (trytype
, TYPE_ATTRIBUTES (oldtype
));
1681 /* Subroutine of diagnose_mismatched_decls. Check for function type
1682 mismatch involving an empty arglist vs a nonempty one and give clearer
1685 diagnose_arglist_conflict (tree newdecl
, tree olddecl
,
1686 tree newtype
, tree oldtype
)
1690 if (TREE_CODE (olddecl
) != FUNCTION_DECL
1691 || !comptypes (TREE_TYPE (oldtype
), TREE_TYPE (newtype
))
1692 || !((!prototype_p (oldtype
) && DECL_INITIAL (olddecl
) == 0)
1693 || (!prototype_p (newtype
) && DECL_INITIAL (newdecl
) == 0)))
1696 t
= TYPE_ARG_TYPES (oldtype
);
1698 t
= TYPE_ARG_TYPES (newtype
);
1699 for (; t
; t
= TREE_CHAIN (t
))
1701 tree type
= TREE_VALUE (t
);
1703 if (TREE_CHAIN (t
) == 0
1704 && TYPE_MAIN_VARIANT (type
) != void_type_node
)
1706 inform (input_location
, "a parameter list with an ellipsis can%'t match "
1707 "an empty parameter name list declaration");
1711 if (c_type_promotes_to (type
) != type
)
1713 inform (input_location
, "an argument type that has a default promotion can%'t match "
1714 "an empty parameter name list declaration");
1720 /* Another subroutine of diagnose_mismatched_decls. OLDDECL is an
1721 old-style function definition, NEWDECL is a prototype declaration.
1722 Diagnose inconsistencies in the argument list. Returns TRUE if
1723 the prototype is compatible, FALSE if not. */
1725 validate_proto_after_old_defn (tree newdecl
, tree newtype
, tree oldtype
)
1727 tree newargs
, oldargs
;
1730 #define END_OF_ARGLIST(t) ((t) == void_type_node)
1732 oldargs
= TYPE_ACTUAL_ARG_TYPES (oldtype
);
1733 newargs
= TYPE_ARG_TYPES (newtype
);
1738 tree oldargtype
= TREE_VALUE (oldargs
);
1739 tree newargtype
= TREE_VALUE (newargs
);
1741 if (oldargtype
== error_mark_node
|| newargtype
== error_mark_node
)
1744 oldargtype
= (TYPE_ATOMIC (oldargtype
)
1745 ? c_build_qualified_type (TYPE_MAIN_VARIANT (oldargtype
),
1747 : TYPE_MAIN_VARIANT (oldargtype
));
1748 newargtype
= (TYPE_ATOMIC (newargtype
)
1749 ? c_build_qualified_type (TYPE_MAIN_VARIANT (newargtype
),
1751 : TYPE_MAIN_VARIANT (newargtype
));
1753 if (END_OF_ARGLIST (oldargtype
) && END_OF_ARGLIST (newargtype
))
1756 /* Reaching the end of just one list means the two decls don't
1757 agree on the number of arguments. */
1758 if (END_OF_ARGLIST (oldargtype
))
1760 error ("prototype for %q+D declares more arguments "
1761 "than previous old-style definition", newdecl
);
1764 else if (END_OF_ARGLIST (newargtype
))
1766 error ("prototype for %q+D declares fewer arguments "
1767 "than previous old-style definition", newdecl
);
1771 /* Type for passing arg must be consistent with that declared
1773 else if (!comptypes (oldargtype
, newargtype
))
1775 error ("prototype for %q+D declares argument %d"
1776 " with incompatible type",
1781 oldargs
= TREE_CHAIN (oldargs
);
1782 newargs
= TREE_CHAIN (newargs
);
1786 /* If we get here, no errors were found, but do issue a warning
1787 for this poor-style construct. */
1788 warning (0, "prototype for %q+D follows non-prototype definition",
1791 #undef END_OF_ARGLIST
1794 /* Subroutine of diagnose_mismatched_decls. Report the location of DECL,
1795 first in a pair of mismatched declarations, using the diagnostic
1798 locate_old_decl (tree decl
)
1800 if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_BUILT_IN (decl
)
1801 && !C_DECL_DECLARED_BUILTIN (decl
))
1803 else if (DECL_INITIAL (decl
))
1804 inform (input_location
, "previous definition of %q+D was here", decl
);
1805 else if (C_DECL_IMPLICIT (decl
))
1806 inform (input_location
, "previous implicit declaration of %q+D was here", decl
);
1808 inform (input_location
, "previous declaration of %q+D was here", decl
);
1811 /* Subroutine of duplicate_decls. Compare NEWDECL to OLDDECL.
1812 Returns true if the caller should proceed to merge the two, false
1813 if OLDDECL should simply be discarded. As a side effect, issues
1814 all necessary diagnostics for invalid or poor-style combinations.
1815 If it returns true, writes the types of NEWDECL and OLDDECL to
1816 *NEWTYPEP and *OLDTYPEP - these may have been adjusted from
1817 TREE_TYPE (NEWDECL, OLDDECL) respectively. */
1820 diagnose_mismatched_decls (tree newdecl
, tree olddecl
,
1821 tree
*newtypep
, tree
*oldtypep
)
1823 tree newtype
, oldtype
;
1824 bool pedwarned
= false;
1825 bool warned
= false;
1828 #define DECL_EXTERN_INLINE(DECL) (DECL_DECLARED_INLINE_P (DECL) \
1829 && DECL_EXTERNAL (DECL))
1831 /* If we have error_mark_node for either decl or type, just discard
1832 the previous decl - we're in an error cascade already. */
1833 if (olddecl
== error_mark_node
|| newdecl
== error_mark_node
)
1835 *oldtypep
= oldtype
= TREE_TYPE (olddecl
);
1836 *newtypep
= newtype
= TREE_TYPE (newdecl
);
1837 if (oldtype
== error_mark_node
|| newtype
== error_mark_node
)
1840 /* Two different categories of symbol altogether. This is an error
1841 unless OLDDECL is a builtin. OLDDECL will be discarded in any case. */
1842 if (TREE_CODE (olddecl
) != TREE_CODE (newdecl
))
1844 if (!(TREE_CODE (olddecl
) == FUNCTION_DECL
1845 && DECL_BUILT_IN (olddecl
)
1846 && !C_DECL_DECLARED_BUILTIN (olddecl
)))
1848 error ("%q+D redeclared as different kind of symbol", newdecl
);
1849 locate_old_decl (olddecl
);
1851 else if (TREE_PUBLIC (newdecl
))
1852 warning (0, "built-in function %q+D declared as non-function",
1855 warning (OPT_Wshadow
, "declaration of %q+D shadows "
1856 "a built-in function", newdecl
);
1860 /* Enumerators have no linkage, so may only be declared once in a
1862 if (TREE_CODE (olddecl
) == CONST_DECL
)
1864 error ("redeclaration of enumerator %q+D", newdecl
);
1865 locate_old_decl (olddecl
);
1869 if (!comptypes (oldtype
, newtype
))
1871 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1872 && DECL_BUILT_IN (olddecl
) && !C_DECL_DECLARED_BUILTIN (olddecl
))
1874 /* Accept harmless mismatch in function types.
1875 This is for the ffs and fprintf builtins. */
1876 tree trytype
= match_builtin_function_types (newtype
, oldtype
);
1878 if (trytype
&& comptypes (newtype
, trytype
))
1879 *oldtypep
= oldtype
= trytype
;
1882 /* If types don't match for a built-in, throw away the
1883 built-in. No point in calling locate_old_decl here, it
1884 won't print anything. */
1885 warning (0, "conflicting types for built-in function %q+D",
1890 else if (TREE_CODE (olddecl
) == FUNCTION_DECL
1891 && DECL_IS_BUILTIN (olddecl
))
1893 /* A conflicting function declaration for a predeclared
1894 function that isn't actually built in. Objective C uses
1895 these. The new declaration silently overrides everything
1896 but the volatility (i.e. noreturn) indication. See also
1897 below. FIXME: Make Objective C use normal builtins. */
1898 TREE_THIS_VOLATILE (newdecl
) |= TREE_THIS_VOLATILE (olddecl
);
1901 /* Permit void foo (...) to match int foo (...) if the latter is
1902 the definition and implicit int was used. See
1903 c-torture/compile/920625-2.c. */
1904 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
&& DECL_INITIAL (newdecl
)
1905 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype
)) == void_type_node
1906 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype
)) == integer_type_node
1907 && C_FUNCTION_IMPLICIT_INT (newdecl
) && !DECL_INITIAL (olddecl
))
1909 pedwarned
= pedwarn (input_location
, 0,
1910 "conflicting types for %q+D", newdecl
);
1911 /* Make sure we keep void as the return type. */
1912 TREE_TYPE (newdecl
) = *newtypep
= newtype
= oldtype
;
1913 C_FUNCTION_IMPLICIT_INT (newdecl
) = 0;
1915 /* Permit void foo (...) to match an earlier call to foo (...) with
1916 no declared type (thus, implicitly int). */
1917 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
1918 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype
)) == void_type_node
1919 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype
)) == integer_type_node
1920 && C_DECL_IMPLICIT (olddecl
) && !DECL_INITIAL (olddecl
))
1922 pedwarned
= pedwarn (input_location
, 0,
1923 "conflicting types for %q+D", newdecl
);
1924 /* Make sure we keep void as the return type. */
1925 TREE_TYPE (olddecl
) = *oldtypep
= oldtype
= newtype
;
1929 int new_quals
= TYPE_QUALS (newtype
);
1930 int old_quals
= TYPE_QUALS (oldtype
);
1932 if (new_quals
!= old_quals
)
1934 addr_space_t new_addr
= DECODE_QUAL_ADDR_SPACE (new_quals
);
1935 addr_space_t old_addr
= DECODE_QUAL_ADDR_SPACE (old_quals
);
1936 if (new_addr
!= old_addr
)
1938 if (ADDR_SPACE_GENERIC_P (new_addr
))
1939 error ("conflicting named address spaces (generic vs %s) "
1941 c_addr_space_name (old_addr
), newdecl
);
1942 else if (ADDR_SPACE_GENERIC_P (old_addr
))
1943 error ("conflicting named address spaces (%s vs generic) "
1945 c_addr_space_name (new_addr
), newdecl
);
1947 error ("conflicting named address spaces (%s vs %s) "
1949 c_addr_space_name (new_addr
),
1950 c_addr_space_name (old_addr
),
1954 if (CLEAR_QUAL_ADDR_SPACE (new_quals
)
1955 != CLEAR_QUAL_ADDR_SPACE (old_quals
))
1956 error ("conflicting type qualifiers for %q+D", newdecl
);
1959 error ("conflicting types for %q+D", newdecl
);
1960 diagnose_arglist_conflict (newdecl
, olddecl
, newtype
, oldtype
);
1961 locate_old_decl (olddecl
);
1966 /* Redeclaration of a type is a constraint violation (6.7.2.3p1),
1967 but silently ignore the redeclaration if either is in a system
1968 header. (Conflicting redeclarations were handled above.) This
1969 is allowed for C11 if the types are the same, not just
1971 if (TREE_CODE (newdecl
) == TYPE_DECL
)
1973 bool types_different
= false;
1974 int comptypes_result
;
1977 = comptypes_check_different_types (oldtype
, newtype
, &types_different
);
1979 if (comptypes_result
!= 1 || types_different
)
1981 error ("redefinition of typedef %q+D with different type", newdecl
);
1982 locate_old_decl (olddecl
);
1986 if (DECL_IN_SYSTEM_HEADER (newdecl
)
1987 || DECL_IN_SYSTEM_HEADER (olddecl
)
1988 || TREE_NO_WARNING (newdecl
)
1989 || TREE_NO_WARNING (olddecl
))
1990 return true; /* Allow OLDDECL to continue in use. */
1992 if (variably_modified_type_p (newtype
, NULL
))
1994 error ("redefinition of typedef %q+D with variably modified type",
1996 locate_old_decl (olddecl
);
1998 else if (pedwarn_c99 (input_location
, OPT_Wpedantic
,
1999 "redefinition of typedef %q+D", newdecl
))
2000 locate_old_decl (olddecl
);
2005 /* Function declarations can either be 'static' or 'extern' (no
2006 qualifier is equivalent to 'extern' - C99 6.2.2p5) and therefore
2007 can never conflict with each other on account of linkage
2008 (6.2.2p4). Multiple definitions are not allowed (6.9p3,5) but
2009 gnu89 mode permits two definitions if one is 'extern inline' and
2010 one is not. The non- extern-inline definition supersedes the
2011 extern-inline definition. */
2013 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2015 /* If you declare a built-in function name as static, or
2016 define the built-in with an old-style definition (so we
2017 can't validate the argument list) the built-in definition is
2018 overridden, but optionally warn this was a bad choice of name. */
2019 if (DECL_BUILT_IN (olddecl
)
2020 && !C_DECL_DECLARED_BUILTIN (olddecl
)
2021 && (!TREE_PUBLIC (newdecl
)
2022 || (DECL_INITIAL (newdecl
)
2023 && !prototype_p (TREE_TYPE (newdecl
)))))
2025 warning (OPT_Wshadow
, "declaration of %q+D shadows "
2026 "a built-in function", newdecl
);
2027 /* Discard the old built-in function. */
2031 if (DECL_INITIAL (newdecl
))
2033 if (DECL_INITIAL (olddecl
))
2035 /* If both decls are in the same TU and the new declaration
2036 isn't overriding an extern inline reject the new decl.
2037 In c99, no overriding is allowed in the same translation
2039 if ((!DECL_EXTERN_INLINE (olddecl
)
2040 || DECL_EXTERN_INLINE (newdecl
)
2041 || (!flag_gnu89_inline
2042 && (!DECL_DECLARED_INLINE_P (olddecl
)
2043 || !lookup_attribute ("gnu_inline",
2044 DECL_ATTRIBUTES (olddecl
)))
2045 && (!DECL_DECLARED_INLINE_P (newdecl
)
2046 || !lookup_attribute ("gnu_inline",
2047 DECL_ATTRIBUTES (newdecl
))))
2049 && same_translation_unit_p (newdecl
, olddecl
))
2051 error ("redefinition of %q+D", newdecl
);
2052 locate_old_decl (olddecl
);
2057 /* If we have a prototype after an old-style function definition,
2058 the argument types must be checked specially. */
2059 else if (DECL_INITIAL (olddecl
)
2060 && !prototype_p (oldtype
) && prototype_p (newtype
)
2061 && TYPE_ACTUAL_ARG_TYPES (oldtype
)
2062 && !validate_proto_after_old_defn (newdecl
, newtype
, oldtype
))
2064 locate_old_decl (olddecl
);
2067 /* A non-static declaration (even an "extern") followed by a
2068 static declaration is undefined behavior per C99 6.2.2p3-5,7.
2069 The same is true for a static forward declaration at block
2070 scope followed by a non-static declaration/definition at file
2071 scope. Static followed by non-static at the same scope is
2072 not undefined behavior, and is the most convenient way to get
2073 some effects (see e.g. what unwind-dw2-fde-glibc.c does to
2074 the definition of _Unwind_Find_FDE in unwind-dw2-fde.c), but
2075 we do diagnose it if -Wtraditional. */
2076 if (TREE_PUBLIC (olddecl
) && !TREE_PUBLIC (newdecl
))
2078 /* Two exceptions to the rule. If olddecl is an extern
2079 inline, or a predeclared function that isn't actually
2080 built in, newdecl silently overrides olddecl. The latter
2081 occur only in Objective C; see also above. (FIXME: Make
2082 Objective C use normal builtins.) */
2083 if (!DECL_IS_BUILTIN (olddecl
)
2084 && !DECL_EXTERN_INLINE (olddecl
))
2086 error ("static declaration of %q+D follows "
2087 "non-static declaration", newdecl
);
2088 locate_old_decl (olddecl
);
2092 else if (TREE_PUBLIC (newdecl
) && !TREE_PUBLIC (olddecl
))
2094 if (DECL_CONTEXT (olddecl
))
2096 error ("non-static declaration of %q+D follows "
2097 "static declaration", newdecl
);
2098 locate_old_decl (olddecl
);
2101 else if (warn_traditional
)
2103 warned
|= warning (OPT_Wtraditional
,
2104 "non-static declaration of %q+D "
2105 "follows static declaration", newdecl
);
2109 /* Make sure gnu_inline attribute is either not present, or
2110 present on all inline decls. */
2111 if (DECL_DECLARED_INLINE_P (olddecl
)
2112 && DECL_DECLARED_INLINE_P (newdecl
))
2114 bool newa
= lookup_attribute ("gnu_inline",
2115 DECL_ATTRIBUTES (newdecl
)) != NULL
;
2116 bool olda
= lookup_attribute ("gnu_inline",
2117 DECL_ATTRIBUTES (olddecl
)) != NULL
;
2120 error_at (input_location
, "%<gnu_inline%> attribute present on %q+D",
2121 newa
? newdecl
: olddecl
);
2122 error_at (DECL_SOURCE_LOCATION (newa
? olddecl
: newdecl
),
2127 else if (TREE_CODE (newdecl
) == VAR_DECL
)
2129 /* Only variables can be thread-local, and all declarations must
2130 agree on this property. */
2131 if (C_DECL_THREADPRIVATE_P (olddecl
) && !DECL_THREAD_LOCAL_P (newdecl
))
2133 /* Nothing to check. Since OLDDECL is marked threadprivate
2134 and NEWDECL does not have a thread-local attribute, we
2135 will merge the threadprivate attribute into NEWDECL. */
2138 else if (DECL_THREAD_LOCAL_P (newdecl
) != DECL_THREAD_LOCAL_P (olddecl
))
2140 if (DECL_THREAD_LOCAL_P (newdecl
))
2141 error ("thread-local declaration of %q+D follows "
2142 "non-thread-local declaration", newdecl
);
2144 error ("non-thread-local declaration of %q+D follows "
2145 "thread-local declaration", newdecl
);
2147 locate_old_decl (olddecl
);
2151 /* Multiple initialized definitions are not allowed (6.9p3,5). */
2152 if (DECL_INITIAL (newdecl
) && DECL_INITIAL (olddecl
))
2154 error ("redefinition of %q+D", newdecl
);
2155 locate_old_decl (olddecl
);
2159 /* Objects declared at file scope: if the first declaration had
2160 external linkage (even if it was an external reference) the
2161 second must have external linkage as well, or the behavior is
2162 undefined. If the first declaration had internal linkage, then
2163 the second must too, or else be an external reference (in which
2164 case the composite declaration still has internal linkage).
2165 As for function declarations, we warn about the static-then-
2166 extern case only for -Wtraditional. See generally 6.2.2p3-5,7. */
2167 if (DECL_FILE_SCOPE_P (newdecl
)
2168 && TREE_PUBLIC (newdecl
) != TREE_PUBLIC (olddecl
))
2170 if (DECL_EXTERNAL (newdecl
))
2172 if (!DECL_FILE_SCOPE_P (olddecl
))
2174 error ("extern declaration of %q+D follows "
2175 "declaration with no linkage", newdecl
);
2176 locate_old_decl (olddecl
);
2179 else if (warn_traditional
)
2181 warned
|= warning (OPT_Wtraditional
,
2182 "non-static declaration of %q+D "
2183 "follows static declaration", newdecl
);
2188 if (TREE_PUBLIC (newdecl
))
2189 error ("non-static declaration of %q+D follows "
2190 "static declaration", newdecl
);
2192 error ("static declaration of %q+D follows "
2193 "non-static declaration", newdecl
);
2195 locate_old_decl (olddecl
);
2199 /* Two objects with the same name declared at the same block
2200 scope must both be external references (6.7p3). */
2201 else if (!DECL_FILE_SCOPE_P (newdecl
))
2203 if (DECL_EXTERNAL (newdecl
))
2205 /* Extern with initializer at block scope, which will
2206 already have received an error. */
2208 else if (DECL_EXTERNAL (olddecl
))
2210 error ("declaration of %q+D with no linkage follows "
2211 "extern declaration", newdecl
);
2212 locate_old_decl (olddecl
);
2216 error ("redeclaration of %q+D with no linkage", newdecl
);
2217 locate_old_decl (olddecl
);
2223 /* C++ does not permit a decl to appear multiple times at file
2226 && DECL_FILE_SCOPE_P (newdecl
)
2227 && !DECL_EXTERNAL (newdecl
)
2228 && !DECL_EXTERNAL (olddecl
))
2229 warned
|= warning_at (DECL_SOURCE_LOCATION (newdecl
),
2231 ("duplicate declaration of %qD is "
2237 /* All decls must agree on a visibility. */
2238 if (CODE_CONTAINS_STRUCT (TREE_CODE (newdecl
), TS_DECL_WITH_VIS
)
2239 && DECL_VISIBILITY_SPECIFIED (newdecl
) && DECL_VISIBILITY_SPECIFIED (olddecl
)
2240 && DECL_VISIBILITY (newdecl
) != DECL_VISIBILITY (olddecl
))
2242 warned
|= warning (0, "redeclaration of %q+D with different visibility "
2243 "(old visibility preserved)", newdecl
);
2246 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2248 /* Diagnose inline __attribute__ ((noinline)) which is silly. */
2249 if (DECL_DECLARED_INLINE_P (newdecl
)
2250 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl
)))
2251 warned
|= warning (OPT_Wattributes
,
2252 "inline declaration of %qD follows "
2253 "declaration with attribute noinline", newdecl
);
2254 else if (DECL_DECLARED_INLINE_P (olddecl
)
2255 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl
)))
2256 warned
|= warning (OPT_Wattributes
,
2257 "declaration of %q+D with attribute "
2258 "noinline follows inline declaration ", newdecl
);
2259 else if (lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl
))
2260 && lookup_attribute ("always_inline", DECL_ATTRIBUTES (olddecl
)))
2261 warned
|= warning (OPT_Wattributes
,
2262 "declaration of %q+D with attribute "
2263 "%qs follows declaration with attribute %qs",
2264 newdecl
, "noinline", "always_inline");
2265 else if (lookup_attribute ("always_inline", DECL_ATTRIBUTES (newdecl
))
2266 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl
)))
2267 warned
|= warning (OPT_Wattributes
,
2268 "declaration of %q+D with attribute "
2269 "%qs follows declaration with attribute %qs",
2270 newdecl
, "always_inline", "noinline");
2271 else if (lookup_attribute ("cold", DECL_ATTRIBUTES (newdecl
))
2272 && lookup_attribute ("hot", DECL_ATTRIBUTES (olddecl
)))
2273 warned
|= warning (OPT_Wattributes
,
2274 "declaration of %q+D with attribute %qs follows "
2275 "declaration with attribute %qs", newdecl
, "cold",
2277 else if (lookup_attribute ("hot", DECL_ATTRIBUTES (newdecl
))
2278 && lookup_attribute ("cold", DECL_ATTRIBUTES (olddecl
)))
2279 warned
|= warning (OPT_Wattributes
,
2280 "declaration of %q+D with attribute %qs follows "
2281 "declaration with attribute %qs", newdecl
, "hot",
2284 else /* PARM_DECL, VAR_DECL */
2286 /* Redeclaration of a parameter is a constraint violation (this is
2287 not explicitly stated, but follows from C99 6.7p3 [no more than
2288 one declaration of the same identifier with no linkage in the
2289 same scope, except type tags] and 6.2.2p6 [parameters have no
2290 linkage]). We must check for a forward parameter declaration,
2291 indicated by TREE_ASM_WRITTEN on the old declaration - this is
2292 an extension, the mandatory diagnostic for which is handled by
2293 mark_forward_parm_decls. */
2295 if (TREE_CODE (newdecl
) == PARM_DECL
2296 && (!TREE_ASM_WRITTEN (olddecl
) || TREE_ASM_WRITTEN (newdecl
)))
2298 error ("redefinition of parameter %q+D", newdecl
);
2299 locate_old_decl (olddecl
);
2304 /* Optional warning for completely redundant decls. */
2305 if (!warned
&& !pedwarned
2306 && warn_redundant_decls
2307 /* Don't warn about a function declaration followed by a
2309 && !(TREE_CODE (newdecl
) == FUNCTION_DECL
2310 && DECL_INITIAL (newdecl
) && !DECL_INITIAL (olddecl
))
2311 /* Don't warn about redundant redeclarations of builtins. */
2312 && !(TREE_CODE (newdecl
) == FUNCTION_DECL
2313 && !DECL_BUILT_IN (newdecl
)
2314 && DECL_BUILT_IN (olddecl
)
2315 && !C_DECL_DECLARED_BUILTIN (olddecl
))
2316 /* Don't warn about an extern followed by a definition. */
2317 && !(DECL_EXTERNAL (olddecl
) && !DECL_EXTERNAL (newdecl
))
2318 /* Don't warn about forward parameter decls. */
2319 && !(TREE_CODE (newdecl
) == PARM_DECL
2320 && TREE_ASM_WRITTEN (olddecl
) && !TREE_ASM_WRITTEN (newdecl
))
2321 /* Don't warn about a variable definition following a declaration. */
2322 && !(TREE_CODE (newdecl
) == VAR_DECL
2323 && DECL_INITIAL (newdecl
) && !DECL_INITIAL (olddecl
)))
2325 warned
= warning (OPT_Wredundant_decls
, "redundant redeclaration of %q+D",
2329 /* Report location of previous decl/defn. */
2330 if (warned
|| pedwarned
)
2331 locate_old_decl (olddecl
);
2333 #undef DECL_EXTERN_INLINE
2338 /* Subroutine of duplicate_decls. NEWDECL has been found to be
2339 consistent with OLDDECL, but carries new information. Merge the
2340 new information into OLDDECL. This function issues no
2344 merge_decls (tree newdecl
, tree olddecl
, tree newtype
, tree oldtype
)
2346 bool new_is_definition
= (TREE_CODE (newdecl
) == FUNCTION_DECL
2347 && DECL_INITIAL (newdecl
) != 0);
2348 bool new_is_prototype
= (TREE_CODE (newdecl
) == FUNCTION_DECL
2349 && prototype_p (TREE_TYPE (newdecl
)));
2350 bool old_is_prototype
= (TREE_CODE (olddecl
) == FUNCTION_DECL
2351 && prototype_p (TREE_TYPE (olddecl
)));
2353 /* For real parm decl following a forward decl, rechain the old decl
2354 in its new location and clear TREE_ASM_WRITTEN (it's not a
2355 forward decl anymore). */
2356 if (TREE_CODE (newdecl
) == PARM_DECL
2357 && TREE_ASM_WRITTEN (olddecl
) && !TREE_ASM_WRITTEN (newdecl
))
2359 struct c_binding
*b
, **here
;
2361 for (here
= ¤t_scope
->bindings
; *here
; here
= &(*here
)->prev
)
2362 if ((*here
)->decl
== olddecl
)
2369 b
->prev
= current_scope
->bindings
;
2370 current_scope
->bindings
= b
;
2372 TREE_ASM_WRITTEN (olddecl
) = 0;
2375 DECL_ATTRIBUTES (newdecl
)
2376 = targetm
.merge_decl_attributes (olddecl
, newdecl
);
2378 /* Merge the data types specified in the two decls. */
2380 = TREE_TYPE (olddecl
)
2381 = composite_type (newtype
, oldtype
);
2383 /* Lay the type out, unless already done. */
2384 if (!comptypes (oldtype
, TREE_TYPE (newdecl
)))
2386 if (TREE_TYPE (newdecl
) != error_mark_node
)
2387 layout_type (TREE_TYPE (newdecl
));
2388 if (TREE_CODE (newdecl
) != FUNCTION_DECL
2389 && TREE_CODE (newdecl
) != TYPE_DECL
2390 && TREE_CODE (newdecl
) != CONST_DECL
)
2391 layout_decl (newdecl
, 0);
2395 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
2396 DECL_SIZE (newdecl
) = DECL_SIZE (olddecl
);
2397 DECL_SIZE_UNIT (newdecl
) = DECL_SIZE_UNIT (olddecl
);
2398 DECL_MODE (newdecl
) = DECL_MODE (olddecl
);
2399 if (DECL_ALIGN (olddecl
) > DECL_ALIGN (newdecl
))
2401 DECL_ALIGN (newdecl
) = DECL_ALIGN (olddecl
);
2402 DECL_USER_ALIGN (newdecl
) |= DECL_USER_ALIGN (olddecl
);
2406 /* Keep the old rtl since we can safely use it. */
2407 if (HAS_RTL_P (olddecl
))
2408 COPY_DECL_RTL (olddecl
, newdecl
);
2410 /* Merge the type qualifiers. */
2411 if (TREE_READONLY (newdecl
))
2412 TREE_READONLY (olddecl
) = 1;
2414 if (TREE_THIS_VOLATILE (newdecl
))
2415 TREE_THIS_VOLATILE (olddecl
) = 1;
2417 /* Merge deprecatedness. */
2418 if (TREE_DEPRECATED (newdecl
))
2419 TREE_DEPRECATED (olddecl
) = 1;
2421 /* If a decl is in a system header and the other isn't, keep the one on the
2422 system header. Otherwise, keep source location of definition rather than
2423 declaration and of prototype rather than non-prototype unless that
2424 prototype is built-in. */
2425 if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl
), TS_DECL_WITH_VIS
)
2426 && DECL_IN_SYSTEM_HEADER (olddecl
)
2427 && !DECL_IN_SYSTEM_HEADER (newdecl
) )
2428 DECL_SOURCE_LOCATION (newdecl
) = DECL_SOURCE_LOCATION (olddecl
);
2429 else if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl
), TS_DECL_WITH_VIS
)
2430 && DECL_IN_SYSTEM_HEADER (newdecl
)
2431 && !DECL_IN_SYSTEM_HEADER (olddecl
))
2432 DECL_SOURCE_LOCATION (olddecl
) = DECL_SOURCE_LOCATION (newdecl
);
2433 else if ((DECL_INITIAL (newdecl
) == 0 && DECL_INITIAL (olddecl
) != 0)
2434 || (old_is_prototype
&& !new_is_prototype
2435 && !C_DECL_BUILTIN_PROTOTYPE (olddecl
)))
2436 DECL_SOURCE_LOCATION (newdecl
) = DECL_SOURCE_LOCATION (olddecl
);
2438 /* Merge the initialization information. */
2439 if (DECL_INITIAL (newdecl
) == 0)
2440 DECL_INITIAL (newdecl
) = DECL_INITIAL (olddecl
);
2442 /* Merge the threadprivate attribute. */
2443 if (TREE_CODE (olddecl
) == VAR_DECL
&& C_DECL_THREADPRIVATE_P (olddecl
))
2444 C_DECL_THREADPRIVATE_P (newdecl
) = 1;
2446 if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl
), TS_DECL_WITH_VIS
))
2448 /* Copy the assembler name.
2449 Currently, it can only be defined in the prototype. */
2450 COPY_DECL_ASSEMBLER_NAME (olddecl
, newdecl
);
2452 /* Use visibility of whichever declaration had it specified */
2453 if (DECL_VISIBILITY_SPECIFIED (olddecl
))
2455 DECL_VISIBILITY (newdecl
) = DECL_VISIBILITY (olddecl
);
2456 DECL_VISIBILITY_SPECIFIED (newdecl
) = 1;
2459 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2461 DECL_STATIC_CONSTRUCTOR(newdecl
) |= DECL_STATIC_CONSTRUCTOR(olddecl
);
2462 DECL_STATIC_DESTRUCTOR (newdecl
) |= DECL_STATIC_DESTRUCTOR (olddecl
);
2463 DECL_NO_LIMIT_STACK (newdecl
) |= DECL_NO_LIMIT_STACK (olddecl
);
2464 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl
)
2465 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl
);
2466 TREE_THIS_VOLATILE (newdecl
) |= TREE_THIS_VOLATILE (olddecl
);
2467 DECL_IS_MALLOC (newdecl
) |= DECL_IS_MALLOC (olddecl
);
2468 DECL_IS_OPERATOR_NEW (newdecl
) |= DECL_IS_OPERATOR_NEW (olddecl
);
2469 TREE_READONLY (newdecl
) |= TREE_READONLY (olddecl
);
2470 DECL_PURE_P (newdecl
) |= DECL_PURE_P (olddecl
);
2471 DECL_IS_NOVOPS (newdecl
) |= DECL_IS_NOVOPS (olddecl
);
2474 /* Merge the storage class information. */
2475 merge_weak (newdecl
, olddecl
);
2477 /* For functions, static overrides non-static. */
2478 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2480 TREE_PUBLIC (newdecl
) &= TREE_PUBLIC (olddecl
);
2481 /* This is since we don't automatically
2482 copy the attributes of NEWDECL into OLDDECL. */
2483 TREE_PUBLIC (olddecl
) = TREE_PUBLIC (newdecl
);
2484 /* If this clears `static', clear it in the identifier too. */
2485 if (!TREE_PUBLIC (olddecl
))
2486 TREE_PUBLIC (DECL_NAME (olddecl
)) = 0;
2490 /* In c99, 'extern' declaration before (or after) 'inline' means this
2491 function is not DECL_EXTERNAL, unless 'gnu_inline' attribute
2493 if (TREE_CODE (newdecl
) == FUNCTION_DECL
2494 && !flag_gnu89_inline
2495 && (DECL_DECLARED_INLINE_P (newdecl
)
2496 || DECL_DECLARED_INLINE_P (olddecl
))
2497 && (!DECL_DECLARED_INLINE_P (newdecl
)
2498 || !DECL_DECLARED_INLINE_P (olddecl
)
2499 || !DECL_EXTERNAL (olddecl
))
2500 && DECL_EXTERNAL (newdecl
)
2501 && !lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (newdecl
))
2502 && !current_function_decl
)
2503 DECL_EXTERNAL (newdecl
) = 0;
2505 /* An inline definition following a static declaration is not
2507 if (new_is_definition
2508 && (DECL_DECLARED_INLINE_P (newdecl
)
2509 || DECL_DECLARED_INLINE_P (olddecl
))
2510 && !TREE_PUBLIC (olddecl
))
2511 DECL_EXTERNAL (newdecl
) = 0;
2513 if (DECL_EXTERNAL (newdecl
))
2515 TREE_STATIC (newdecl
) = TREE_STATIC (olddecl
);
2516 DECL_EXTERNAL (newdecl
) = DECL_EXTERNAL (olddecl
);
2518 /* An extern decl does not override previous storage class. */
2519 TREE_PUBLIC (newdecl
) = TREE_PUBLIC (olddecl
);
2520 if (!DECL_EXTERNAL (newdecl
))
2522 DECL_CONTEXT (newdecl
) = DECL_CONTEXT (olddecl
);
2523 DECL_COMMON (newdecl
) = DECL_COMMON (olddecl
);
2528 TREE_STATIC (olddecl
) = TREE_STATIC (newdecl
);
2529 TREE_PUBLIC (olddecl
) = TREE_PUBLIC (newdecl
);
2532 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2534 /* If we're redefining a function previously defined as extern
2535 inline, make sure we emit debug info for the inline before we
2536 throw it away, in case it was inlined into a function that
2537 hasn't been written out yet. */
2538 if (new_is_definition
&& DECL_INITIAL (olddecl
))
2539 /* The new defn must not be inline. */
2540 DECL_UNINLINABLE (newdecl
) = 1;
2543 /* If either decl says `inline', this fn is inline, unless
2544 its definition was passed already. */
2545 if (DECL_DECLARED_INLINE_P (newdecl
)
2546 || DECL_DECLARED_INLINE_P (olddecl
))
2547 DECL_DECLARED_INLINE_P (newdecl
) = 1;
2549 DECL_UNINLINABLE (newdecl
) = DECL_UNINLINABLE (olddecl
)
2550 = (DECL_UNINLINABLE (newdecl
) || DECL_UNINLINABLE (olddecl
));
2552 DECL_DISREGARD_INLINE_LIMITS (newdecl
)
2553 = DECL_DISREGARD_INLINE_LIMITS (olddecl
)
2554 = (DECL_DISREGARD_INLINE_LIMITS (newdecl
)
2555 || DECL_DISREGARD_INLINE_LIMITS (olddecl
));
2558 if (DECL_BUILT_IN (olddecl
))
2560 /* If redeclaring a builtin function, it stays built in.
2561 But it gets tagged as having been declared. */
2562 DECL_BUILT_IN_CLASS (newdecl
) = DECL_BUILT_IN_CLASS (olddecl
);
2563 DECL_FUNCTION_CODE (newdecl
) = DECL_FUNCTION_CODE (olddecl
);
2564 C_DECL_DECLARED_BUILTIN (newdecl
) = 1;
2565 if (new_is_prototype
)
2567 C_DECL_BUILTIN_PROTOTYPE (newdecl
) = 0;
2568 if (DECL_BUILT_IN_CLASS (newdecl
) == BUILT_IN_NORMAL
)
2570 enum built_in_function fncode
= DECL_FUNCTION_CODE (newdecl
);
2573 /* If a compatible prototype of these builtin functions
2574 is seen, assume the runtime implements it with the
2575 expected semantics. */
2576 case BUILT_IN_STPCPY
:
2577 if (builtin_decl_explicit_p (fncode
))
2578 set_builtin_decl_implicit_p (fncode
, true);
2581 if (builtin_decl_explicit_p (fncode
))
2582 set_builtin_decl_declared_p (fncode
, true);
2588 C_DECL_BUILTIN_PROTOTYPE (newdecl
)
2589 = C_DECL_BUILTIN_PROTOTYPE (olddecl
);
2592 /* Preserve function specific target and optimization options */
2593 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl
)
2594 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl
))
2595 DECL_FUNCTION_SPECIFIC_TARGET (newdecl
)
2596 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl
);
2598 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl
)
2599 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl
))
2600 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl
)
2601 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl
);
2603 /* Also preserve various other info from the definition. */
2604 if (!new_is_definition
)
2607 DECL_RESULT (newdecl
) = DECL_RESULT (olddecl
);
2608 DECL_INITIAL (newdecl
) = DECL_INITIAL (olddecl
);
2609 DECL_STRUCT_FUNCTION (newdecl
) = DECL_STRUCT_FUNCTION (olddecl
);
2610 DECL_SAVED_TREE (newdecl
) = DECL_SAVED_TREE (olddecl
);
2611 DECL_ARGUMENTS (newdecl
) = copy_list (DECL_ARGUMENTS (olddecl
));
2612 for (t
= DECL_ARGUMENTS (newdecl
); t
; t
= DECL_CHAIN (t
))
2613 DECL_CONTEXT (t
) = newdecl
;
2615 /* See if we've got a function to instantiate from. */
2616 if (DECL_SAVED_TREE (olddecl
))
2617 DECL_ABSTRACT_ORIGIN (newdecl
)
2618 = DECL_ABSTRACT_ORIGIN (olddecl
);
2622 /* Merge the USED information. */
2623 if (TREE_USED (olddecl
))
2624 TREE_USED (newdecl
) = 1;
2625 else if (TREE_USED (newdecl
))
2626 TREE_USED (olddecl
) = 1;
2627 if (TREE_CODE (olddecl
) == VAR_DECL
|| TREE_CODE (olddecl
) == PARM_DECL
)
2628 DECL_READ_P (newdecl
) |= DECL_READ_P (olddecl
);
2629 if (DECL_PRESERVE_P (olddecl
))
2630 DECL_PRESERVE_P (newdecl
) = 1;
2631 else if (DECL_PRESERVE_P (newdecl
))
2632 DECL_PRESERVE_P (olddecl
) = 1;
2634 /* Merge DECL_COMMON */
2635 if (VAR_P (olddecl
) && VAR_P (newdecl
)
2636 && !lookup_attribute ("common", DECL_ATTRIBUTES (newdecl
))
2637 && !lookup_attribute ("nocommon", DECL_ATTRIBUTES (newdecl
)))
2638 DECL_COMMON (newdecl
) = DECL_COMMON (newdecl
) && DECL_COMMON (olddecl
);
2640 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
2641 But preserve OLDDECL's DECL_UID, DECL_CONTEXT and
2642 DECL_ARGUMENTS (if appropriate). */
2644 unsigned olddecl_uid
= DECL_UID (olddecl
);
2645 tree olddecl_context
= DECL_CONTEXT (olddecl
);
2646 tree olddecl_arguments
= NULL
;
2647 if (TREE_CODE (olddecl
) == FUNCTION_DECL
)
2648 olddecl_arguments
= DECL_ARGUMENTS (olddecl
);
2650 memcpy ((char *) olddecl
+ sizeof (struct tree_common
),
2651 (char *) newdecl
+ sizeof (struct tree_common
),
2652 sizeof (struct tree_decl_common
) - sizeof (struct tree_common
));
2653 DECL_USER_ALIGN (olddecl
) = DECL_USER_ALIGN (newdecl
);
2654 switch (TREE_CODE (olddecl
))
2659 struct symtab_node
*snode
= olddecl
->decl_with_vis
.symtab_node
;
2661 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
2662 (char *) newdecl
+ sizeof (struct tree_decl_common
),
2663 tree_code_size (TREE_CODE (olddecl
)) - sizeof (struct tree_decl_common
));
2664 olddecl
->decl_with_vis
.symtab_node
= snode
;
2666 if ((DECL_EXTERNAL (olddecl
)
2667 || TREE_PUBLIC (olddecl
)
2668 || TREE_STATIC (olddecl
))
2669 && DECL_SECTION_NAME (newdecl
) != NULL
)
2670 set_decl_section_name (olddecl
, DECL_SECTION_NAME (newdecl
));
2672 /* This isn't quite correct for something like
2673 int __thread x attribute ((tls_model ("local-exec")));
2674 extern int __thread x;
2675 as we'll lose the "local-exec" model. */
2676 if (TREE_CODE (olddecl
) == VAR_DECL
2677 && DECL_THREAD_LOCAL_P (newdecl
))
2678 set_decl_tls_model (olddecl
, DECL_TLS_MODEL (newdecl
));
2688 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
2689 (char *) newdecl
+ sizeof (struct tree_decl_common
),
2690 tree_code_size (TREE_CODE (olddecl
)) - sizeof (struct tree_decl_common
));
2695 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
2696 (char *) newdecl
+ sizeof (struct tree_decl_common
),
2697 sizeof (struct tree_decl_non_common
) - sizeof (struct tree_decl_common
));
2699 DECL_UID (olddecl
) = olddecl_uid
;
2700 DECL_CONTEXT (olddecl
) = olddecl_context
;
2701 if (TREE_CODE (olddecl
) == FUNCTION_DECL
)
2702 DECL_ARGUMENTS (olddecl
) = olddecl_arguments
;
2705 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2706 so that encode_section_info has a chance to look at the new decl
2707 flags and attributes. */
2708 if (DECL_RTL_SET_P (olddecl
)
2709 && (TREE_CODE (olddecl
) == FUNCTION_DECL
2710 || (TREE_CODE (olddecl
) == VAR_DECL
2711 && TREE_STATIC (olddecl
))))
2712 make_decl_rtl (olddecl
);
2715 /* Handle when a new declaration NEWDECL has the same name as an old
2716 one OLDDECL in the same binding contour. Prints an error message
2719 If safely possible, alter OLDDECL to look like NEWDECL, and return
2720 true. Otherwise, return false. */
2723 duplicate_decls (tree newdecl
, tree olddecl
)
2725 tree newtype
= NULL
, oldtype
= NULL
;
2727 if (!diagnose_mismatched_decls (newdecl
, olddecl
, &newtype
, &oldtype
))
2729 /* Avoid `unused variable' and other warnings for OLDDECL. */
2730 TREE_NO_WARNING (olddecl
) = 1;
2734 merge_decls (newdecl
, olddecl
, newtype
, oldtype
);
2736 /* The NEWDECL will no longer be needed.
2738 Before releasing the node, be sure to remove function from symbol
2739 table that might have been inserted there to record comdat group.
2740 Be sure to however do not free DECL_STRUCT_FUNCTION because this
2741 structure is shared in between NEWDECL and OLDECL. */
2742 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2743 DECL_STRUCT_FUNCTION (newdecl
) = NULL
;
2744 if (VAR_OR_FUNCTION_DECL_P (newdecl
))
2746 struct symtab_node
*snode
= symtab_node::get (newdecl
);
2755 /* Check whether decl-node NEW_DECL shadows an existing declaration. */
2757 warn_if_shadowing (tree new_decl
)
2759 struct c_binding
*b
;
2761 /* Shadow warnings wanted? */
2763 /* No shadow warnings for internally generated vars. */
2764 || DECL_IS_BUILTIN (new_decl
)
2765 /* No shadow warnings for vars made for inlining. */
2766 || DECL_FROM_INLINE (new_decl
))
2769 /* Is anything being shadowed? Invisible decls do not count. */
2770 for (b
= I_SYMBOL_BINDING (DECL_NAME (new_decl
)); b
; b
= b
->shadowed
)
2771 if (b
->decl
&& b
->decl
!= new_decl
&& !b
->invisible
2772 && (b
->decl
== error_mark_node
2773 || diagnostic_report_warnings_p (global_dc
,
2774 DECL_SOURCE_LOCATION (b
->decl
))))
2776 tree old_decl
= b
->decl
;
2777 bool warned
= false;
2779 if (old_decl
== error_mark_node
)
2781 warning (OPT_Wshadow
, "declaration of %q+D shadows previous "
2782 "non-variable", new_decl
);
2785 else if (TREE_CODE (old_decl
) == PARM_DECL
)
2786 warned
= warning (OPT_Wshadow
,
2787 "declaration of %q+D shadows a parameter",
2789 else if (DECL_FILE_SCOPE_P (old_decl
))
2791 /* Do not warn if a variable shadows a function, unless
2792 the variable is a function or a pointer-to-function. */
2793 if (TREE_CODE (old_decl
) == FUNCTION_DECL
2794 && TREE_CODE (new_decl
) != FUNCTION_DECL
2795 && !FUNCTION_POINTER_TYPE_P (TREE_TYPE (new_decl
)))
2798 warned
= warning_at (DECL_SOURCE_LOCATION (new_decl
), OPT_Wshadow
,
2799 "declaration of %qD shadows a global "
2803 else if (TREE_CODE (old_decl
) == FUNCTION_DECL
2804 && DECL_BUILT_IN (old_decl
))
2806 warning (OPT_Wshadow
, "declaration of %q+D shadows "
2807 "a built-in function", new_decl
);
2811 warned
= warning (OPT_Wshadow
, "declaration of %q+D shadows a "
2812 "previous local", new_decl
);
2815 inform (DECL_SOURCE_LOCATION (old_decl
),
2816 "shadowed declaration is here");
2822 /* Record a decl-node X as belonging to the current lexical scope.
2823 Check for errors (such as an incompatible declaration for the same
2824 name already seen in the same scope).
2826 Returns either X or an old decl for the same name.
2827 If an old decl is returned, it may have been smashed
2828 to agree with what X says. */
2833 tree name
= DECL_NAME (x
);
2834 struct c_scope
*scope
= current_scope
;
2835 struct c_binding
*b
;
2836 bool nested
= false;
2837 location_t locus
= DECL_SOURCE_LOCATION (x
);
2839 /* Must set DECL_CONTEXT for everything not at file scope or
2840 DECL_FILE_SCOPE_P won't work. Local externs don't count
2841 unless they have initializers (which generate code). */
2842 if (current_function_decl
2843 && (!VAR_OR_FUNCTION_DECL_P (x
)
2844 || DECL_INITIAL (x
) || !DECL_EXTERNAL (x
)))
2845 DECL_CONTEXT (x
) = current_function_decl
;
2847 /* Anonymous decls are just inserted in the scope. */
2850 bind (name
, x
, scope
, /*invisible=*/false, /*nested=*/false,
2855 /* First, see if there is another declaration with the same name in
2856 the current scope. If there is, duplicate_decls may do all the
2857 work for us. If duplicate_decls returns false, that indicates
2858 two incompatible decls in the same scope; we are to silently
2859 replace the old one (duplicate_decls has issued all appropriate
2860 diagnostics). In particular, we should not consider possible
2861 duplicates in the external scope, or shadowing. */
2862 b
= I_SYMBOL_BINDING (name
);
2863 if (b
&& B_IN_SCOPE (b
, scope
))
2865 struct c_binding
*b_ext
, *b_use
;
2866 tree type
= TREE_TYPE (x
);
2867 tree visdecl
= b
->decl
;
2868 tree vistype
= TREE_TYPE (visdecl
);
2869 if (TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
2870 && COMPLETE_TYPE_P (TREE_TYPE (x
)))
2871 b
->inner_comp
= false;
2874 /* If this is an external linkage declaration, we should check
2875 for compatibility with the type in the external scope before
2876 setting the type at this scope based on the visible
2877 information only. */
2878 if (TREE_PUBLIC (x
) && TREE_PUBLIC (visdecl
))
2880 while (b_ext
&& !B_IN_EXTERNAL_SCOPE (b_ext
))
2881 b_ext
= b_ext
->shadowed
;
2886 TREE_TYPE (b_use
->decl
) = b_use
->u
.type
;
2889 if (duplicate_decls (x
, b_use
->decl
))
2893 /* Save the updated type in the external scope and
2894 restore the proper type for this scope. */
2896 if (comptypes (vistype
, type
))
2897 thistype
= composite_type (vistype
, type
);
2899 thistype
= TREE_TYPE (b_use
->decl
);
2900 b_use
->u
.type
= TREE_TYPE (b_use
->decl
);
2901 if (TREE_CODE (b_use
->decl
) == FUNCTION_DECL
2902 && DECL_BUILT_IN (b_use
->decl
))
2904 = build_type_attribute_variant (thistype
,
2907 TREE_TYPE (b_use
->decl
) = thistype
;
2912 goto skip_external_and_shadow_checks
;
2915 /* All declarations with external linkage, and all external
2916 references, go in the external scope, no matter what scope is
2917 current. However, the binding in that scope is ignored for
2918 purposes of normal name lookup. A separate binding structure is
2919 created in the requested scope; this governs the normal
2920 visibility of the symbol.
2922 The binding in the externals scope is used exclusively for
2923 detecting duplicate declarations of the same object, no matter
2924 what scope they are in; this is what we do here. (C99 6.2.7p2:
2925 All declarations that refer to the same object or function shall
2926 have compatible type; otherwise, the behavior is undefined.) */
2927 if (DECL_EXTERNAL (x
) || scope
== file_scope
)
2929 tree type
= TREE_TYPE (x
);
2932 bool type_saved
= false;
2933 if (b
&& !B_IN_EXTERNAL_SCOPE (b
)
2934 && VAR_OR_FUNCTION_DECL_P (b
->decl
)
2935 && DECL_FILE_SCOPE_P (b
->decl
))
2938 vistype
= TREE_TYPE (visdecl
);
2940 if (scope
!= file_scope
2941 && !DECL_IN_SYSTEM_HEADER (x
))
2942 warning (OPT_Wnested_externs
, "nested extern declaration of %qD", x
);
2944 while (b
&& !B_IN_EXTERNAL_SCOPE (b
))
2946 /* If this decl might be modified, save its type. This is
2947 done here rather than when the decl is first bound
2948 because the type may change after first binding, through
2949 being completed or through attributes being added. If we
2950 encounter multiple such decls, only the first should have
2951 its type saved; the others will already have had their
2952 proper types saved and the types will not have changed as
2953 their scopes will not have been re-entered. */
2954 if (DECL_P (b
->decl
) && DECL_FILE_SCOPE_P (b
->decl
) && !type_saved
)
2956 b
->u
.type
= TREE_TYPE (b
->decl
);
2959 if (B_IN_FILE_SCOPE (b
)
2960 && TREE_CODE (b
->decl
) == VAR_DECL
2961 && TREE_STATIC (b
->decl
)
2962 && TREE_CODE (TREE_TYPE (b
->decl
)) == ARRAY_TYPE
2963 && !TYPE_DOMAIN (TREE_TYPE (b
->decl
))
2964 && TREE_CODE (type
) == ARRAY_TYPE
2965 && TYPE_DOMAIN (type
)
2966 && TYPE_MAX_VALUE (TYPE_DOMAIN (type
))
2967 && !integer_zerop (TYPE_MAX_VALUE (TYPE_DOMAIN (type
))))
2969 /* Array type completed in inner scope, which should be
2970 diagnosed if the completion does not have size 1 and
2971 it does not get completed in the file scope. */
2972 b
->inner_comp
= true;
2977 /* If a matching external declaration has been found, set its
2978 type to the composite of all the types of that declaration.
2979 After the consistency checks, it will be reset to the
2980 composite of the visible types only. */
2981 if (b
&& (TREE_PUBLIC (x
) || same_translation_unit_p (x
, b
->decl
))
2983 TREE_TYPE (b
->decl
) = b
->u
.type
;
2985 /* The point of the same_translation_unit_p check here is,
2986 we want to detect a duplicate decl for a construct like
2987 foo() { extern bar(); } ... static bar(); but not if
2988 they are in different translation units. In any case,
2989 the static does not go in the externals scope. */
2991 && (TREE_PUBLIC (x
) || same_translation_unit_p (x
, b
->decl
))
2992 && duplicate_decls (x
, b
->decl
))
2997 if (comptypes (vistype
, type
))
2998 thistype
= composite_type (vistype
, type
);
3000 thistype
= TREE_TYPE (b
->decl
);
3004 b
->u
.type
= TREE_TYPE (b
->decl
);
3005 if (TREE_CODE (b
->decl
) == FUNCTION_DECL
&& DECL_BUILT_IN (b
->decl
))
3007 = build_type_attribute_variant (thistype
,
3008 TYPE_ATTRIBUTES (b
->u
.type
));
3009 TREE_TYPE (b
->decl
) = thistype
;
3010 bind (name
, b
->decl
, scope
, /*invisible=*/false, /*nested=*/true,
3014 else if (TREE_PUBLIC (x
))
3016 if (visdecl
&& !b
&& duplicate_decls (x
, visdecl
))
3018 /* An external declaration at block scope referring to a
3019 visible entity with internal linkage. The composite
3020 type will already be correct for this scope, so we
3021 just need to fall through to make the declaration in
3028 bind (name
, x
, external_scope
, /*invisible=*/true,
3029 /*nested=*/false, locus
);
3035 if (TREE_CODE (x
) != PARM_DECL
)
3036 warn_if_shadowing (x
);
3038 skip_external_and_shadow_checks
:
3039 if (TREE_CODE (x
) == TYPE_DECL
)
3041 /* So this is a typedef, set its underlying type. */
3042 set_underlying_type (x
);
3044 /* If X is a typedef defined in the current function, record it
3045 for the purpose of implementing the -Wunused-local-typedefs
3047 record_locally_defined_typedef (x
);
3050 bind (name
, x
, scope
, /*invisible=*/false, nested
, locus
);
3052 /* If x's type is incomplete because it's based on a
3053 structure or union which has not yet been fully declared,
3054 attach it to that structure or union type, so we can go
3055 back and complete the variable declaration later, if the
3056 structure or union gets fully declared.
3058 If the input is erroneous, we can have error_mark in the type
3059 slot (e.g. "f(void a, ...)") - that doesn't count as an
3061 if (TREE_TYPE (x
) != error_mark_node
3062 && !COMPLETE_TYPE_P (TREE_TYPE (x
)))
3064 tree element
= TREE_TYPE (x
);
3066 while (TREE_CODE (element
) == ARRAY_TYPE
)
3067 element
= TREE_TYPE (element
);
3068 element
= TYPE_MAIN_VARIANT (element
);
3070 if ((TREE_CODE (element
) == RECORD_TYPE
3071 || TREE_CODE (element
) == UNION_TYPE
)
3072 && (TREE_CODE (x
) != TYPE_DECL
3073 || TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
)
3074 && !COMPLETE_TYPE_P (element
))
3075 C_TYPE_INCOMPLETE_VARS (element
)
3076 = tree_cons (NULL_TREE
, x
, C_TYPE_INCOMPLETE_VARS (element
));
3081 /* Record X as belonging to file scope.
3082 This is used only internally by the Objective-C front end,
3083 and is limited to its needs. duplicate_decls is not called;
3084 if there is any preexisting decl for this identifier, it is an ICE. */
3087 pushdecl_top_level (tree x
)
3090 bool nested
= false;
3091 gcc_assert (TREE_CODE (x
) == VAR_DECL
|| TREE_CODE (x
) == CONST_DECL
);
3093 name
= DECL_NAME (x
);
3095 gcc_assert (TREE_CODE (x
) == CONST_DECL
|| !I_SYMBOL_BINDING (name
));
3097 if (TREE_PUBLIC (x
))
3099 bind (name
, x
, external_scope
, /*invisible=*/true, /*nested=*/false,
3104 bind (name
, x
, file_scope
, /*invisible=*/false, nested
, UNKNOWN_LOCATION
);
3110 implicit_decl_warning (location_t loc
, tree id
, tree olddecl
)
3112 if (warn_implicit_function_declaration
)
3117 warned
= pedwarn (loc
, OPT_Wimplicit_function_declaration
,
3118 "implicit declaration of function %qE", id
);
3120 warned
= warning_at (loc
, OPT_Wimplicit_function_declaration
,
3121 G_("implicit declaration of function %qE"), id
);
3122 if (olddecl
&& warned
)
3123 locate_old_decl (olddecl
);
3127 /* This function represents mapping of a function code FCODE
3128 to its respective header. */
3131 header_for_builtin_fn (enum built_in_function fcode
)
3135 CASE_FLT_FN (BUILT_IN_ACOS
):
3136 CASE_FLT_FN (BUILT_IN_ACOSH
):
3137 CASE_FLT_FN (BUILT_IN_ASIN
):
3138 CASE_FLT_FN (BUILT_IN_ASINH
):
3139 CASE_FLT_FN (BUILT_IN_ATAN
):
3140 CASE_FLT_FN (BUILT_IN_ATANH
):
3141 CASE_FLT_FN (BUILT_IN_ATAN2
):
3142 CASE_FLT_FN (BUILT_IN_CBRT
):
3143 CASE_FLT_FN (BUILT_IN_CEIL
):
3144 CASE_FLT_FN (BUILT_IN_COPYSIGN
):
3145 CASE_FLT_FN (BUILT_IN_COS
):
3146 CASE_FLT_FN (BUILT_IN_COSH
):
3147 CASE_FLT_FN (BUILT_IN_ERF
):
3148 CASE_FLT_FN (BUILT_IN_ERFC
):
3149 CASE_FLT_FN (BUILT_IN_EXP
):
3150 CASE_FLT_FN (BUILT_IN_EXP2
):
3151 CASE_FLT_FN (BUILT_IN_EXPM1
):
3152 CASE_FLT_FN (BUILT_IN_FABS
):
3153 CASE_FLT_FN (BUILT_IN_FDIM
):
3154 CASE_FLT_FN (BUILT_IN_FLOOR
):
3155 CASE_FLT_FN (BUILT_IN_FMA
):
3156 CASE_FLT_FN (BUILT_IN_FMAX
):
3157 CASE_FLT_FN (BUILT_IN_FMIN
):
3158 CASE_FLT_FN (BUILT_IN_FMOD
):
3159 CASE_FLT_FN (BUILT_IN_FREXP
):
3160 CASE_FLT_FN (BUILT_IN_HYPOT
):
3161 CASE_FLT_FN (BUILT_IN_ILOGB
):
3162 CASE_FLT_FN (BUILT_IN_LDEXP
):
3163 CASE_FLT_FN (BUILT_IN_LGAMMA
):
3164 CASE_FLT_FN (BUILT_IN_LLRINT
):
3165 CASE_FLT_FN (BUILT_IN_LLROUND
):
3166 CASE_FLT_FN (BUILT_IN_LOG
):
3167 CASE_FLT_FN (BUILT_IN_LOG10
):
3168 CASE_FLT_FN (BUILT_IN_LOG1P
):
3169 CASE_FLT_FN (BUILT_IN_LOG2
):
3170 CASE_FLT_FN (BUILT_IN_LOGB
):
3171 CASE_FLT_FN (BUILT_IN_LRINT
):
3172 CASE_FLT_FN (BUILT_IN_LROUND
):
3173 CASE_FLT_FN (BUILT_IN_MODF
):
3174 CASE_FLT_FN (BUILT_IN_NAN
):
3175 CASE_FLT_FN (BUILT_IN_NEARBYINT
):
3176 CASE_FLT_FN (BUILT_IN_NEXTAFTER
):
3177 CASE_FLT_FN (BUILT_IN_NEXTTOWARD
):
3178 CASE_FLT_FN (BUILT_IN_POW
):
3179 CASE_FLT_FN (BUILT_IN_REMAINDER
):
3180 CASE_FLT_FN (BUILT_IN_REMQUO
):
3181 CASE_FLT_FN (BUILT_IN_RINT
):
3182 CASE_FLT_FN (BUILT_IN_ROUND
):
3183 CASE_FLT_FN (BUILT_IN_SCALBLN
):
3184 CASE_FLT_FN (BUILT_IN_SCALBN
):
3185 CASE_FLT_FN (BUILT_IN_SIN
):
3186 CASE_FLT_FN (BUILT_IN_SINH
):
3187 CASE_FLT_FN (BUILT_IN_SINCOS
):
3188 CASE_FLT_FN (BUILT_IN_SQRT
):
3189 CASE_FLT_FN (BUILT_IN_TAN
):
3190 CASE_FLT_FN (BUILT_IN_TANH
):
3191 CASE_FLT_FN (BUILT_IN_TGAMMA
):
3192 CASE_FLT_FN (BUILT_IN_TRUNC
):
3193 case BUILT_IN_ISINF
:
3194 case BUILT_IN_ISNAN
:
3196 CASE_FLT_FN (BUILT_IN_CABS
):
3197 CASE_FLT_FN (BUILT_IN_CACOS
):
3198 CASE_FLT_FN (BUILT_IN_CACOSH
):
3199 CASE_FLT_FN (BUILT_IN_CARG
):
3200 CASE_FLT_FN (BUILT_IN_CASIN
):
3201 CASE_FLT_FN (BUILT_IN_CASINH
):
3202 CASE_FLT_FN (BUILT_IN_CATAN
):
3203 CASE_FLT_FN (BUILT_IN_CATANH
):
3204 CASE_FLT_FN (BUILT_IN_CCOS
):
3205 CASE_FLT_FN (BUILT_IN_CCOSH
):
3206 CASE_FLT_FN (BUILT_IN_CEXP
):
3207 CASE_FLT_FN (BUILT_IN_CIMAG
):
3208 CASE_FLT_FN (BUILT_IN_CLOG
):
3209 CASE_FLT_FN (BUILT_IN_CONJ
):
3210 CASE_FLT_FN (BUILT_IN_CPOW
):
3211 CASE_FLT_FN (BUILT_IN_CPROJ
):
3212 CASE_FLT_FN (BUILT_IN_CREAL
):
3213 CASE_FLT_FN (BUILT_IN_CSIN
):
3214 CASE_FLT_FN (BUILT_IN_CSINH
):
3215 CASE_FLT_FN (BUILT_IN_CSQRT
):
3216 CASE_FLT_FN (BUILT_IN_CTAN
):
3217 CASE_FLT_FN (BUILT_IN_CTANH
):
3218 return "<complex.h>";
3219 case BUILT_IN_MEMCHR
:
3220 case BUILT_IN_MEMCMP
:
3221 case BUILT_IN_MEMCPY
:
3222 case BUILT_IN_MEMMOVE
:
3223 case BUILT_IN_MEMSET
:
3224 case BUILT_IN_STRCAT
:
3225 case BUILT_IN_STRCHR
:
3226 case BUILT_IN_STRCMP
:
3227 case BUILT_IN_STRCPY
:
3228 case BUILT_IN_STRCSPN
:
3229 case BUILT_IN_STRLEN
:
3230 case BUILT_IN_STRNCAT
:
3231 case BUILT_IN_STRNCMP
:
3232 case BUILT_IN_STRNCPY
:
3233 case BUILT_IN_STRPBRK
:
3234 case BUILT_IN_STRRCHR
:
3235 case BUILT_IN_STRSPN
:
3236 case BUILT_IN_STRSTR
:
3237 return "<string.h>";
3238 case BUILT_IN_FPRINTF
:
3240 case BUILT_IN_FPUTC
:
3241 case BUILT_IN_FPUTS
:
3242 case BUILT_IN_FSCANF
:
3243 case BUILT_IN_FWRITE
:
3244 case BUILT_IN_PRINTF
:
3245 case BUILT_IN_PUTCHAR
:
3247 case BUILT_IN_SCANF
:
3248 case BUILT_IN_SNPRINTF
:
3249 case BUILT_IN_SPRINTF
:
3250 case BUILT_IN_SSCANF
:
3251 case BUILT_IN_VFPRINTF
:
3252 case BUILT_IN_VFSCANF
:
3253 case BUILT_IN_VPRINTF
:
3254 case BUILT_IN_VSCANF
:
3255 case BUILT_IN_VSNPRINTF
:
3256 case BUILT_IN_VSPRINTF
:
3257 case BUILT_IN_VSSCANF
:
3259 case BUILT_IN_ISALNUM
:
3260 case BUILT_IN_ISALPHA
:
3261 case BUILT_IN_ISBLANK
:
3262 case BUILT_IN_ISCNTRL
:
3263 case BUILT_IN_ISDIGIT
:
3264 case BUILT_IN_ISGRAPH
:
3265 case BUILT_IN_ISLOWER
:
3266 case BUILT_IN_ISPRINT
:
3267 case BUILT_IN_ISPUNCT
:
3268 case BUILT_IN_ISSPACE
:
3269 case BUILT_IN_ISUPPER
:
3270 case BUILT_IN_ISXDIGIT
:
3271 case BUILT_IN_TOLOWER
:
3272 case BUILT_IN_TOUPPER
:
3274 case BUILT_IN_ISWALNUM
:
3275 case BUILT_IN_ISWALPHA
:
3276 case BUILT_IN_ISWBLANK
:
3277 case BUILT_IN_ISWCNTRL
:
3278 case BUILT_IN_ISWDIGIT
:
3279 case BUILT_IN_ISWGRAPH
:
3280 case BUILT_IN_ISWLOWER
:
3281 case BUILT_IN_ISWPRINT
:
3282 case BUILT_IN_ISWPUNCT
:
3283 case BUILT_IN_ISWSPACE
:
3284 case BUILT_IN_ISWUPPER
:
3285 case BUILT_IN_ISWXDIGIT
:
3286 case BUILT_IN_TOWLOWER
:
3287 case BUILT_IN_TOWUPPER
:
3288 return "<wctype.h>";
3289 case BUILT_IN_ABORT
:
3291 case BUILT_IN_CALLOC
:
3295 case BUILT_IN_LLABS
:
3296 case BUILT_IN_MALLOC
:
3297 case BUILT_IN_REALLOC
:
3298 case BUILT_IN__EXIT2
:
3299 case BUILT_IN_ALIGNED_ALLOC
:
3300 return "<stdlib.h>";
3301 case BUILT_IN_IMAXABS
:
3302 return "<inttypes.h>";
3303 case BUILT_IN_STRFTIME
:
3310 /* Generate an implicit declaration for identifier FUNCTIONID at LOC as a
3311 function of type int (). */
3314 implicitly_declare (location_t loc
, tree functionid
)
3316 struct c_binding
*b
;
3320 for (b
= I_SYMBOL_BINDING (functionid
); b
; b
= b
->shadowed
)
3322 if (B_IN_SCOPE (b
, external_scope
))
3331 if (decl
== error_mark_node
)
3334 /* FIXME: Objective-C has weird not-really-builtin functions
3335 which are supposed to be visible automatically. They wind up
3336 in the external scope because they're pushed before the file
3337 scope gets created. Catch this here and rebind them into the
3339 if (!DECL_BUILT_IN (decl
) && DECL_IS_BUILTIN (decl
))
3341 bind (functionid
, decl
, file_scope
,
3342 /*invisible=*/false, /*nested=*/true,
3343 DECL_SOURCE_LOCATION (decl
));
3348 tree newtype
= default_function_type
;
3350 TREE_TYPE (decl
) = b
->u
.type
;
3351 /* Implicit declaration of a function already declared
3352 (somehow) in a different scope, or as a built-in.
3353 If this is the first time this has happened, warn;
3354 then recycle the old declaration but with the new type. */
3355 if (!C_DECL_IMPLICIT (decl
))
3357 implicit_decl_warning (loc
, functionid
, decl
);
3358 C_DECL_IMPLICIT (decl
) = 1;
3360 if (DECL_BUILT_IN (decl
))
3362 newtype
= build_type_attribute_variant (newtype
,
3364 (TREE_TYPE (decl
)));
3365 if (!comptypes (newtype
, TREE_TYPE (decl
)))
3367 bool warned
= warning_at (loc
, 0, "incompatible implicit "
3368 "declaration of built-in "
3369 "function %qD", decl
);
3370 /* See if we can hint which header to include. */
3372 = header_for_builtin_fn (DECL_FUNCTION_CODE (decl
));
3373 if (header
!= NULL
&& warned
)
3374 inform (loc
, "include %qs or provide a declaration of %qD",
3376 newtype
= TREE_TYPE (decl
);
3381 if (!comptypes (newtype
, TREE_TYPE (decl
)))
3383 error_at (loc
, "incompatible implicit declaration of "
3384 "function %qD", decl
);
3385 locate_old_decl (decl
);
3388 b
->u
.type
= TREE_TYPE (decl
);
3389 TREE_TYPE (decl
) = newtype
;
3390 bind (functionid
, decl
, current_scope
,
3391 /*invisible=*/false, /*nested=*/true,
3392 DECL_SOURCE_LOCATION (decl
));
3397 /* Not seen before. */
3398 decl
= build_decl (loc
, FUNCTION_DECL
, functionid
, default_function_type
);
3399 DECL_EXTERNAL (decl
) = 1;
3400 TREE_PUBLIC (decl
) = 1;
3401 C_DECL_IMPLICIT (decl
) = 1;
3402 implicit_decl_warning (loc
, functionid
, 0);
3403 asmspec_tree
= maybe_apply_renaming_pragma (decl
, /*asmname=*/NULL
);
3405 set_user_assembler_name (decl
, TREE_STRING_POINTER (asmspec_tree
));
3407 /* C89 says implicit declarations are in the innermost block.
3408 So we record the decl in the standard fashion. */
3409 decl
= pushdecl (decl
);
3411 /* No need to call objc_check_decl here - it's a function type. */
3412 rest_of_decl_compilation (decl
, 0, 0);
3414 /* Write a record describing this implicit function declaration
3415 to the prototypes file (if requested). */
3416 gen_aux_info_record (decl
, 0, 1, 0);
3418 /* Possibly apply some default attributes to this implicit declaration. */
3419 decl_attributes (&decl
, NULL_TREE
, 0);
3424 /* Issue an error message for a reference to an undeclared variable
3425 ID, including a reference to a builtin outside of function-call
3426 context. Establish a binding of the identifier to error_mark_node
3427 in an appropriate scope, which will suppress further errors for the
3428 same identifier. The error message should be given location LOC. */
3430 undeclared_variable (location_t loc
, tree id
)
3432 static bool already
= false;
3433 struct c_scope
*scope
;
3435 if (current_function_decl
== 0)
3437 error_at (loc
, "%qE undeclared here (not in a function)", id
);
3438 scope
= current_scope
;
3442 if (!objc_diagnose_private_ivar (id
))
3443 error_at (loc
, "%qE undeclared (first use in this function)", id
);
3446 inform (loc
, "each undeclared identifier is reported only"
3447 " once for each function it appears in");
3451 /* If we are parsing old-style parameter decls, current_function_decl
3452 will be nonnull but current_function_scope will be null. */
3453 scope
= current_function_scope
? current_function_scope
: current_scope
;
3455 bind (id
, error_mark_node
, scope
, /*invisible=*/false, /*nested=*/false,
3459 /* Subroutine of lookup_label, declare_label, define_label: construct a
3460 LABEL_DECL with all the proper frills. Also create a struct
3461 c_label_vars initialized for the current scope. */
3464 make_label (location_t location
, tree name
, bool defining
,
3465 struct c_label_vars
**p_label_vars
)
3467 tree label
= build_decl (location
, LABEL_DECL
, name
, void_type_node
);
3468 DECL_CONTEXT (label
) = current_function_decl
;
3469 DECL_MODE (label
) = VOIDmode
;
3471 c_label_vars
*label_vars
= ggc_alloc
<c_label_vars
> ();
3472 label_vars
->shadowed
= NULL
;
3473 set_spot_bindings (&label_vars
->label_bindings
, defining
);
3474 label_vars
->decls_in_scope
= make_tree_vector ();
3475 label_vars
->gotos
= NULL
;
3476 *p_label_vars
= label_vars
;
3481 /* Get the LABEL_DECL corresponding to identifier NAME as a label.
3482 Create one if none exists so far for the current function.
3483 This is called when a label is used in a goto expression or
3484 has its address taken. */
3487 lookup_label (tree name
)
3490 struct c_label_vars
*label_vars
;
3492 if (current_function_scope
== 0)
3494 error ("label %qE referenced outside of any function", name
);
3498 /* Use a label already defined or ref'd with this name, but not if
3499 it is inherited from a containing function and wasn't declared
3501 label
= I_LABEL_DECL (name
);
3502 if (label
&& (DECL_CONTEXT (label
) == current_function_decl
3503 || C_DECLARED_LABEL_FLAG (label
)))
3505 /* If the label has only been declared, update its apparent
3506 location to point here, for better diagnostics if it
3507 turns out not to have been defined. */
3508 if (DECL_INITIAL (label
) == NULL_TREE
)
3509 DECL_SOURCE_LOCATION (label
) = input_location
;
3513 /* No label binding for that identifier; make one. */
3514 label
= make_label (input_location
, name
, false, &label_vars
);
3516 /* Ordinary labels go in the current function scope. */
3517 bind_label (name
, label
, current_function_scope
, label_vars
);
3522 /* Issue a warning about DECL for a goto statement at GOTO_LOC going
3526 warn_about_goto (location_t goto_loc
, tree label
, tree decl
)
3528 if (variably_modified_type_p (TREE_TYPE (decl
), NULL_TREE
))
3530 "jump into scope of identifier with variably modified type");
3532 warning_at (goto_loc
, OPT_Wjump_misses_init
,
3533 "jump skips variable initialization");
3534 inform (DECL_SOURCE_LOCATION (label
), "label %qD defined here", label
);
3535 inform (DECL_SOURCE_LOCATION (decl
), "%qD declared here", decl
);
3538 /* Look up a label because of a goto statement. This is like
3539 lookup_label, but also issues any appropriate warnings. */
3542 lookup_label_for_goto (location_t loc
, tree name
)
3545 struct c_label_vars
*label_vars
;
3549 label
= lookup_label (name
);
3550 if (label
== NULL_TREE
)
3553 /* If we are jumping to a different function, we can't issue any
3555 if (DECL_CONTEXT (label
) != current_function_decl
)
3557 gcc_assert (C_DECLARED_LABEL_FLAG (label
));
3561 label_vars
= I_LABEL_BINDING (name
)->u
.label
;
3563 /* If the label has not yet been defined, then push this goto on a
3564 list for possible later warnings. */
3565 if (label_vars
->label_bindings
.scope
== NULL
)
3567 c_goto_bindings
*g
= ggc_alloc
<c_goto_bindings
> ();
3570 set_spot_bindings (&g
->goto_bindings
, true);
3571 vec_safe_push (label_vars
->gotos
, g
);
3575 /* If there are any decls in label_vars->decls_in_scope, then this
3576 goto has missed the declaration of the decl. This happens for a
3582 Issue a warning or error. */
3583 FOR_EACH_VEC_SAFE_ELT (label_vars
->decls_in_scope
, ix
, decl
)
3584 warn_about_goto (loc
, label
, decl
);
3586 if (label_vars
->label_bindings
.left_stmt_expr
)
3588 error_at (loc
, "jump into statement expression");
3589 inform (DECL_SOURCE_LOCATION (label
), "label %qD defined here", label
);
3595 /* Make a label named NAME in the current function, shadowing silently
3596 any that may be inherited from containing functions or containing
3597 scopes. This is called for __label__ declarations. */
3600 declare_label (tree name
)
3602 struct c_binding
*b
= I_LABEL_BINDING (name
);
3604 struct c_label_vars
*label_vars
;
3606 /* Check to make sure that the label hasn't already been declared
3608 if (b
&& B_IN_CURRENT_SCOPE (b
))
3610 error ("duplicate label declaration %qE", name
);
3611 locate_old_decl (b
->decl
);
3613 /* Just use the previous declaration. */
3617 label
= make_label (input_location
, name
, false, &label_vars
);
3618 C_DECLARED_LABEL_FLAG (label
) = 1;
3620 /* Declared labels go in the current scope. */
3621 bind_label (name
, label
, current_scope
, label_vars
);
3626 /* When we define a label, issue any appropriate warnings if there are
3627 any gotos earlier in the function which jump to this label. */
3630 check_earlier_gotos (tree label
, struct c_label_vars
* label_vars
)
3633 struct c_goto_bindings
*g
;
3635 FOR_EACH_VEC_SAFE_ELT (label_vars
->gotos
, ix
, g
)
3637 struct c_binding
*b
;
3638 struct c_scope
*scope
;
3640 /* We have a goto to this label. The goto is going forward. In
3641 g->scope, the goto is going to skip any binding which was
3642 defined after g->bindings_in_scope. */
3643 if (g
->goto_bindings
.scope
->has_jump_unsafe_decl
)
3645 for (b
= g
->goto_bindings
.scope
->bindings
;
3646 b
!= g
->goto_bindings
.bindings_in_scope
;
3649 if (decl_jump_unsafe (b
->decl
))
3650 warn_about_goto (g
->loc
, label
, b
->decl
);
3654 /* We also need to warn about decls defined in any scopes
3655 between the scope of the label and the scope of the goto. */
3656 for (scope
= label_vars
->label_bindings
.scope
;
3657 scope
!= g
->goto_bindings
.scope
;
3658 scope
= scope
->outer
)
3660 gcc_assert (scope
!= NULL
);
3661 if (scope
->has_jump_unsafe_decl
)
3663 if (scope
== label_vars
->label_bindings
.scope
)
3664 b
= label_vars
->label_bindings
.bindings_in_scope
;
3666 b
= scope
->bindings
;
3667 for (; b
!= NULL
; b
= b
->prev
)
3669 if (decl_jump_unsafe (b
->decl
))
3670 warn_about_goto (g
->loc
, label
, b
->decl
);
3675 if (g
->goto_bindings
.stmt_exprs
> 0)
3677 error_at (g
->loc
, "jump into statement expression");
3678 inform (DECL_SOURCE_LOCATION (label
), "label %qD defined here",
3683 /* Now that the label is defined, we will issue warnings about
3684 subsequent gotos to this label when we see them. */
3685 vec_safe_truncate (label_vars
->gotos
, 0);
3686 label_vars
->gotos
= NULL
;
3689 /* Define a label, specifying the location in the source file.
3690 Return the LABEL_DECL node for the label, if the definition is valid.
3691 Otherwise return 0. */
3694 define_label (location_t location
, tree name
)
3696 /* Find any preexisting label with this name. It is an error
3697 if that label has already been defined in this function, or
3698 if there is a containing function with a declared label with
3700 tree label
= I_LABEL_DECL (name
);
3703 && ((DECL_CONTEXT (label
) == current_function_decl
3704 && DECL_INITIAL (label
) != 0)
3705 || (DECL_CONTEXT (label
) != current_function_decl
3706 && C_DECLARED_LABEL_FLAG (label
))))
3708 error_at (location
, "duplicate label %qD", label
);
3709 locate_old_decl (label
);
3712 else if (label
&& DECL_CONTEXT (label
) == current_function_decl
)
3714 struct c_label_vars
*label_vars
= I_LABEL_BINDING (name
)->u
.label
;
3716 /* The label has been used or declared already in this function,
3717 but not defined. Update its location to point to this
3719 DECL_SOURCE_LOCATION (label
) = location
;
3720 set_spot_bindings (&label_vars
->label_bindings
, true);
3722 /* Issue warnings as required about any goto statements from
3723 earlier in the function. */
3724 check_earlier_gotos (label
, label_vars
);
3728 struct c_label_vars
*label_vars
;
3730 /* No label binding for that identifier; make one. */
3731 label
= make_label (location
, name
, true, &label_vars
);
3733 /* Ordinary labels go in the current function scope. */
3734 bind_label (name
, label
, current_function_scope
, label_vars
);
3737 if (!in_system_header_at (input_location
) && lookup_name (name
))
3738 warning_at (location
, OPT_Wtraditional
,
3739 "traditional C lacks a separate namespace "
3740 "for labels, identifier %qE conflicts", name
);
3742 /* Mark label as having been defined. */
3743 DECL_INITIAL (label
) = error_mark_node
;
3747 /* Get the bindings for a new switch statement. This is used to issue
3748 warnings as appropriate for jumps from the switch to case or
3751 struct c_spot_bindings
*
3752 c_get_switch_bindings (void)
3754 struct c_spot_bindings
*switch_bindings
;
3756 switch_bindings
= XNEW (struct c_spot_bindings
);
3757 set_spot_bindings (switch_bindings
, true);
3758 return switch_bindings
;
3762 c_release_switch_bindings (struct c_spot_bindings
*bindings
)
3764 gcc_assert (bindings
->stmt_exprs
== 0 && !bindings
->left_stmt_expr
);
3768 /* This is called at the point of a case or default label to issue
3769 warnings about decls as needed. It returns true if it found an
3770 error, not just a warning. */
3773 c_check_switch_jump_warnings (struct c_spot_bindings
*switch_bindings
,
3774 location_t switch_loc
, location_t case_loc
)
3777 struct c_scope
*scope
;
3780 for (scope
= current_scope
;
3781 scope
!= switch_bindings
->scope
;
3782 scope
= scope
->outer
)
3784 struct c_binding
*b
;
3786 gcc_assert (scope
!= NULL
);
3788 if (!scope
->has_jump_unsafe_decl
)
3791 for (b
= scope
->bindings
; b
!= NULL
; b
= b
->prev
)
3793 if (decl_jump_unsafe (b
->decl
))
3795 if (variably_modified_type_p (TREE_TYPE (b
->decl
), NULL_TREE
))
3799 ("switch jumps into scope of identifier with "
3800 "variably modified type"));
3803 warning_at (case_loc
, OPT_Wjump_misses_init
,
3804 "switch jumps over variable initialization");
3805 inform (switch_loc
, "switch starts here");
3806 inform (DECL_SOURCE_LOCATION (b
->decl
), "%qD declared here",
3812 if (switch_bindings
->stmt_exprs
> 0)
3815 error_at (case_loc
, "switch jumps into statement expression");
3816 inform (switch_loc
, "switch starts here");
3822 /* Given NAME, an IDENTIFIER_NODE,
3823 return the structure (or union or enum) definition for that name.
3824 If THISLEVEL_ONLY is nonzero, searches only the current_scope.
3825 CODE says which kind of type the caller wants;
3826 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
3827 If PLOC is not NULL and this returns non-null, it sets *PLOC to the
3828 location where the tag was defined.
3829 If the wrong kind of type is found, an error is reported. */
3832 lookup_tag (enum tree_code code
, tree name
, int thislevel_only
,
3835 struct c_binding
*b
= I_TAG_BINDING (name
);
3841 /* We only care about whether it's in this level if
3842 thislevel_only was set or it might be a type clash. */
3843 if (thislevel_only
|| TREE_CODE (b
->decl
) != code
)
3845 /* For our purposes, a tag in the external scope is the same as
3846 a tag in the file scope. (Primarily relevant to Objective-C
3847 and its builtin structure tags, which get pushed before the
3848 file scope is created.) */
3849 if (B_IN_CURRENT_SCOPE (b
)
3850 || (current_scope
== file_scope
&& B_IN_EXTERNAL_SCOPE (b
)))
3854 if (thislevel_only
&& !thislevel
)
3857 if (TREE_CODE (b
->decl
) != code
)
3859 /* Definition isn't the kind we were looking for. */
3860 pending_invalid_xref
= name
;
3861 pending_invalid_xref_location
= input_location
;
3863 /* If in the same binding level as a declaration as a tag
3864 of a different type, this must not be allowed to
3865 shadow that tag, so give the error immediately.
3866 (For example, "struct foo; union foo;" is invalid.) */
3868 pending_xref_error ();
3877 /* Print an error message now
3878 for a recent invalid struct, union or enum cross reference.
3879 We don't print them immediately because they are not invalid
3880 when used in the `struct foo;' construct for shadowing. */
3883 pending_xref_error (void)
3885 if (pending_invalid_xref
!= 0)
3886 error_at (pending_invalid_xref_location
, "%qE defined as wrong kind of tag",
3887 pending_invalid_xref
);
3888 pending_invalid_xref
= 0;
3892 /* Look up NAME in the current scope and its superiors
3893 in the namespace of variables, functions and typedefs.
3894 Return a ..._DECL node of some kind representing its definition,
3895 or return 0 if it is undefined. */
3898 lookup_name (tree name
)
3900 struct c_binding
*b
= I_SYMBOL_BINDING (name
);
3901 if (b
&& !b
->invisible
)
3903 maybe_record_typedef_use (b
->decl
);
3909 /* Similar to `lookup_name' but look only at the indicated scope. */
3912 lookup_name_in_scope (tree name
, struct c_scope
*scope
)
3914 struct c_binding
*b
;
3916 for (b
= I_SYMBOL_BINDING (name
); b
; b
= b
->shadowed
)
3917 if (B_IN_SCOPE (b
, scope
))
3922 /* Create the predefined scalar types of C,
3923 and some nodes representing standard constants (0, 1, (void *) 0).
3924 Initialize the global scope.
3925 Make definitions for built-in primitive functions. */
3928 c_init_decl_processing (void)
3930 location_t save_loc
= input_location
;
3932 /* Initialize reserved words for parser. */
3935 current_function_decl
= 0;
3937 gcc_obstack_init (&parser_obstack
);
3939 /* Make the externals scope. */
3941 external_scope
= current_scope
;
3943 /* Declarations from c_common_nodes_and_builtins must not be associated
3944 with this input file, lest we get differences between using and not
3945 using preprocessed headers. */
3946 input_location
= BUILTINS_LOCATION
;
3948 c_common_nodes_and_builtins ();
3950 /* In C, comparisons and TRUTH_* expressions have type int. */
3951 truthvalue_type_node
= integer_type_node
;
3952 truthvalue_true_node
= integer_one_node
;
3953 truthvalue_false_node
= integer_zero_node
;
3955 /* Even in C99, which has a real boolean type. */
3956 pushdecl (build_decl (UNKNOWN_LOCATION
, TYPE_DECL
, get_identifier ("_Bool"),
3957 boolean_type_node
));
3959 input_location
= save_loc
;
3961 make_fname_decl
= c_make_fname_decl
;
3962 start_fname_decls ();
3965 /* Create the VAR_DECL at LOC for __FUNCTION__ etc. ID is the name to
3966 give the decl, NAME is the initialization string and TYPE_DEP
3967 indicates whether NAME depended on the type of the function. As we
3968 don't yet implement delayed emission of static data, we mark the
3969 decl as emitted so it is not placed in the output. Anything using
3970 it must therefore pull out the STRING_CST initializer directly.
3974 c_make_fname_decl (location_t loc
, tree id
, int type_dep
)
3976 const char *name
= fname_as_string (type_dep
);
3977 tree decl
, type
, init
;
3978 size_t length
= strlen (name
);
3980 type
= build_array_type (char_type_node
,
3981 build_index_type (size_int (length
)));
3982 type
= c_build_qualified_type (type
, TYPE_QUAL_CONST
);
3984 decl
= build_decl (loc
, VAR_DECL
, id
, type
);
3986 TREE_STATIC (decl
) = 1;
3987 TREE_READONLY (decl
) = 1;
3988 DECL_ARTIFICIAL (decl
) = 1;
3990 init
= build_string (length
+ 1, name
);
3991 free (CONST_CAST (char *, name
));
3992 TREE_TYPE (init
) = type
;
3993 DECL_INITIAL (decl
) = init
;
3995 TREE_USED (decl
) = 1;
3997 if (current_function_decl
3998 /* For invalid programs like this:
4001 const char* p = __FUNCTION__;
4003 the __FUNCTION__ is believed to appear in K&R style function
4004 parameter declarator. In that case we still don't have
4006 && (!seen_error () || current_function_scope
))
4008 DECL_CONTEXT (decl
) = current_function_decl
;
4009 bind (id
, decl
, current_function_scope
,
4010 /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION
);
4013 finish_decl (decl
, loc
, init
, NULL_TREE
, NULL_TREE
);
4019 c_builtin_function (tree decl
)
4021 tree type
= TREE_TYPE (decl
);
4022 tree id
= DECL_NAME (decl
);
4024 const char *name
= IDENTIFIER_POINTER (id
);
4025 C_DECL_BUILTIN_PROTOTYPE (decl
) = prototype_p (type
);
4027 /* Should never be called on a symbol with a preexisting meaning. */
4028 gcc_assert (!I_SYMBOL_BINDING (id
));
4030 bind (id
, decl
, external_scope
, /*invisible=*/true, /*nested=*/false,
4033 /* Builtins in the implementation namespace are made visible without
4034 needing to be explicitly declared. See push_file_scope. */
4035 if (name
[0] == '_' && (name
[1] == '_' || ISUPPER (name
[1])))
4037 DECL_CHAIN (decl
) = visible_builtins
;
4038 visible_builtins
= decl
;
4045 c_builtin_function_ext_scope (tree decl
)
4047 tree type
= TREE_TYPE (decl
);
4048 tree id
= DECL_NAME (decl
);
4050 const char *name
= IDENTIFIER_POINTER (id
);
4051 C_DECL_BUILTIN_PROTOTYPE (decl
) = prototype_p (type
);
4054 bind (id
, decl
, external_scope
, /*invisible=*/false, /*nested=*/false,
4057 /* Builtins in the implementation namespace are made visible without
4058 needing to be explicitly declared. See push_file_scope. */
4059 if (name
[0] == '_' && (name
[1] == '_' || ISUPPER (name
[1])))
4061 DECL_CHAIN (decl
) = visible_builtins
;
4062 visible_builtins
= decl
;
4068 /* Called when a declaration is seen that contains no names to declare.
4069 If its type is a reference to a structure, union or enum inherited
4070 from a containing scope, shadow that tag name for the current scope
4071 with a forward reference.
4072 If its type defines a new named structure or union
4073 or defines an enum, it is valid but we need not do anything here.
4074 Otherwise, it is an error. */
4077 shadow_tag (const struct c_declspecs
*declspecs
)
4079 shadow_tag_warned (declspecs
, 0);
4082 /* WARNED is 1 if we have done a pedwarn, 2 if we have done a warning,
4085 shadow_tag_warned (const struct c_declspecs
*declspecs
, int warned
)
4087 bool found_tag
= false;
4089 if (declspecs
->type
&& !declspecs
->default_int_p
&& !declspecs
->typedef_p
)
4091 tree value
= declspecs
->type
;
4092 enum tree_code code
= TREE_CODE (value
);
4094 if (code
== RECORD_TYPE
|| code
== UNION_TYPE
|| code
== ENUMERAL_TYPE
)
4095 /* Used to test also that TYPE_SIZE (value) != 0.
4096 That caused warning for `struct foo;' at top level in the file. */
4098 tree name
= TYPE_NAME (value
);
4103 if (declspecs
->restrict_p
)
4105 error ("invalid use of %<restrict%>");
4111 if (warned
!= 1 && code
!= ENUMERAL_TYPE
)
4112 /* Empty unnamed enum OK */
4114 pedwarn (input_location
, 0,
4115 "unnamed struct/union that defines no instances");
4119 else if (declspecs
->typespec_kind
!= ctsk_tagdef
4120 && declspecs
->typespec_kind
!= ctsk_tagfirstref
4121 && declspecs
->storage_class
!= csc_none
)
4124 pedwarn (input_location
, 0,
4125 "empty declaration with storage class specifier "
4126 "does not redeclare tag");
4128 pending_xref_error ();
4130 else if (declspecs
->typespec_kind
!= ctsk_tagdef
4131 && declspecs
->typespec_kind
!= ctsk_tagfirstref
4132 && (declspecs
->const_p
4133 || declspecs
->volatile_p
4134 || declspecs
->atomic_p
4135 || declspecs
->restrict_p
4136 || declspecs
->address_space
))
4139 pedwarn (input_location
, 0,
4140 "empty declaration with type qualifier "
4141 "does not redeclare tag");
4143 pending_xref_error ();
4145 else if (declspecs
->typespec_kind
!= ctsk_tagdef
4146 && declspecs
->typespec_kind
!= ctsk_tagfirstref
4147 && declspecs
->alignas_p
)
4150 pedwarn (input_location
, 0,
4151 "empty declaration with %<_Alignas%> "
4152 "does not redeclare tag");
4154 pending_xref_error ();
4158 pending_invalid_xref
= 0;
4159 t
= lookup_tag (code
, name
, 1, NULL
);
4163 t
= make_node (code
);
4164 pushtag (input_location
, name
, t
);
4170 if (warned
!= 1 && !in_system_header_at (input_location
))
4172 pedwarn (input_location
, 0,
4173 "useless type name in empty declaration");
4178 else if (warned
!= 1 && !in_system_header_at (input_location
)
4179 && declspecs
->typedef_p
)
4181 pedwarn (input_location
, 0, "useless type name in empty declaration");
4185 pending_invalid_xref
= 0;
4187 if (declspecs
->inline_p
)
4189 error ("%<inline%> in empty declaration");
4193 if (declspecs
->noreturn_p
)
4195 error ("%<_Noreturn%> in empty declaration");
4199 if (current_scope
== file_scope
&& declspecs
->storage_class
== csc_auto
)
4201 error ("%<auto%> in file-scope empty declaration");
4205 if (current_scope
== file_scope
&& declspecs
->storage_class
== csc_register
)
4207 error ("%<register%> in file-scope empty declaration");
4211 if (!warned
&& !in_system_header_at (input_location
)
4212 && declspecs
->storage_class
!= csc_none
)
4214 warning (0, "useless storage class specifier in empty declaration");
4218 if (!warned
&& !in_system_header_at (input_location
) && declspecs
->thread_p
)
4220 warning (0, "useless %qs in empty declaration",
4221 declspecs
->thread_gnu_p
? "__thread" : "_Thread_local");
4226 && !in_system_header_at (input_location
)
4227 && (declspecs
->const_p
4228 || declspecs
->volatile_p
4229 || declspecs
->atomic_p
4230 || declspecs
->restrict_p
4231 || declspecs
->address_space
))
4233 warning (0, "useless type qualifier in empty declaration");
4237 if (!warned
&& !in_system_header_at (input_location
)
4238 && declspecs
->alignas_p
)
4240 warning (0, "useless %<_Alignas%> in empty declaration");
4247 pedwarn (input_location
, 0, "empty declaration");
4252 /* Return the qualifiers from SPECS as a bitwise OR of TYPE_QUAL_*
4253 bits. SPECS represents declaration specifiers that the grammar
4254 only permits to contain type qualifiers and attributes. */
4257 quals_from_declspecs (const struct c_declspecs
*specs
)
4259 int quals
= ((specs
->const_p
? TYPE_QUAL_CONST
: 0)
4260 | (specs
->volatile_p
? TYPE_QUAL_VOLATILE
: 0)
4261 | (specs
->restrict_p
? TYPE_QUAL_RESTRICT
: 0)
4262 | (specs
->atomic_p
? TYPE_QUAL_ATOMIC
: 0)
4263 | (ENCODE_QUAL_ADDR_SPACE (specs
->address_space
)));
4264 gcc_assert (!specs
->type
4265 && !specs
->decl_attr
4266 && specs
->typespec_word
== cts_none
4267 && specs
->storage_class
== csc_none
4268 && !specs
->typedef_p
4269 && !specs
->explicit_signed_p
4270 && !specs
->deprecated_p
4272 && !specs
->long_long_p
4275 && !specs
->unsigned_p
4276 && !specs
->complex_p
4278 && !specs
->noreturn_p
4279 && !specs
->thread_p
);
4283 /* Construct an array declarator. LOC is the location of the
4284 beginning of the array (usually the opening brace). EXPR is the
4285 expression inside [], or NULL_TREE. QUALS are the type qualifiers
4286 inside the [] (to be applied to the pointer to which a parameter
4287 array is converted). STATIC_P is true if "static" is inside the
4288 [], false otherwise. VLA_UNSPEC_P is true if the array is [*], a
4289 VLA of unspecified length which is nevertheless a complete type,
4290 false otherwise. The field for the contained declarator is left to
4291 be filled in by set_array_declarator_inner. */
4293 struct c_declarator
*
4294 build_array_declarator (location_t loc
,
4295 tree expr
, struct c_declspecs
*quals
, bool static_p
,
4298 struct c_declarator
*declarator
= XOBNEW (&parser_obstack
,
4299 struct c_declarator
);
4300 declarator
->id_loc
= loc
;
4301 declarator
->kind
= cdk_array
;
4302 declarator
->declarator
= 0;
4303 declarator
->u
.array
.dimen
= expr
;
4306 declarator
->u
.array
.attrs
= quals
->attrs
;
4307 declarator
->u
.array
.quals
= quals_from_declspecs (quals
);
4311 declarator
->u
.array
.attrs
= NULL_TREE
;
4312 declarator
->u
.array
.quals
= 0;
4314 declarator
->u
.array
.static_p
= static_p
;
4315 declarator
->u
.array
.vla_unspec_p
= vla_unspec_p
;
4316 if (static_p
|| quals
!= NULL
)
4317 pedwarn_c90 (loc
, OPT_Wpedantic
,
4318 "ISO C90 does not support %<static%> or type "
4319 "qualifiers in parameter array declarators");
4321 pedwarn_c90 (loc
, OPT_Wpedantic
,
4322 "ISO C90 does not support %<[*]%> array declarators");
4325 if (!current_scope
->parm_flag
)
4328 error_at (loc
, "%<[*]%> not allowed in other than "
4329 "function prototype scope");
4330 declarator
->u
.array
.vla_unspec_p
= false;
4333 current_scope
->had_vla_unspec
= true;
4338 /* Set the contained declarator of an array declarator. DECL is the
4339 declarator, as constructed by build_array_declarator; INNER is what
4340 appears on the left of the []. */
4342 struct c_declarator
*
4343 set_array_declarator_inner (struct c_declarator
*decl
,
4344 struct c_declarator
*inner
)
4346 decl
->declarator
= inner
;
4350 /* INIT is a constructor that forms DECL's initializer. If the final
4351 element initializes a flexible array field, add the size of that
4352 initializer to DECL's size. */
4355 add_flexible_array_elts_to_size (tree decl
, tree init
)
4359 if (vec_safe_is_empty (CONSTRUCTOR_ELTS (init
)))
4362 elt
= CONSTRUCTOR_ELTS (init
)->last ().value
;
4363 type
= TREE_TYPE (elt
);
4364 if (TREE_CODE (type
) == ARRAY_TYPE
4365 && TYPE_SIZE (type
) == NULL_TREE
4366 && TYPE_DOMAIN (type
) != NULL_TREE
4367 && TYPE_MAX_VALUE (TYPE_DOMAIN (type
)) == NULL_TREE
)
4369 complete_array_type (&type
, elt
, false);
4371 = size_binop (PLUS_EXPR
, DECL_SIZE (decl
), TYPE_SIZE (type
));
4372 DECL_SIZE_UNIT (decl
)
4373 = size_binop (PLUS_EXPR
, DECL_SIZE_UNIT (decl
), TYPE_SIZE_UNIT (type
));
4377 /* Decode a "typename", such as "int **", returning a ..._TYPE node.
4378 Set *EXPR, if EXPR not NULL, to any expression to be evaluated
4379 before the type name, and set *EXPR_CONST_OPERANDS, if
4380 EXPR_CONST_OPERANDS not NULL, to indicate whether the type name may
4381 appear in a constant expression. */
4384 groktypename (struct c_type_name
*type_name
, tree
*expr
,
4385 bool *expr_const_operands
)
4388 tree attrs
= type_name
->specs
->attrs
;
4390 type_name
->specs
->attrs
= NULL_TREE
;
4392 type
= grokdeclarator (type_name
->declarator
, type_name
->specs
, TYPENAME
,
4393 false, NULL
, &attrs
, expr
, expr_const_operands
,
4396 /* Apply attributes. */
4397 decl_attributes (&type
, attrs
, 0);
4402 /* Wrapper for decl_attributes that adds some implicit attributes
4403 to VAR_DECLs or FUNCTION_DECLs. */
4406 c_decl_attributes (tree
*node
, tree attributes
, int flags
)
4408 /* Add implicit "omp declare target" attribute if requested. */
4409 if (current_omp_declare_target_attribute
4410 && ((TREE_CODE (*node
) == VAR_DECL
4411 && (TREE_STATIC (*node
) || DECL_EXTERNAL (*node
)))
4412 || TREE_CODE (*node
) == FUNCTION_DECL
))
4414 if (TREE_CODE (*node
) == VAR_DECL
4415 && ((DECL_CONTEXT (*node
)
4416 && TREE_CODE (DECL_CONTEXT (*node
)) == FUNCTION_DECL
)
4417 || (current_function_decl
&& !DECL_EXTERNAL (*node
))))
4418 error ("%q+D in block scope inside of declare target directive",
4420 else if (TREE_CODE (*node
) == VAR_DECL
4421 && !lang_hooks
.types
.omp_mappable_type (TREE_TYPE (*node
)))
4422 error ("%q+D in declare target directive does not have mappable type",
4425 attributes
= tree_cons (get_identifier ("omp declare target"),
4426 NULL_TREE
, attributes
);
4428 return decl_attributes (node
, attributes
, flags
);
4432 /* Decode a declarator in an ordinary declaration or data definition.
4433 This is called as soon as the type information and variable name
4434 have been parsed, before parsing the initializer if any.
4435 Here we create the ..._DECL node, fill in its type,
4436 and put it on the list of decls for the current context.
4437 The ..._DECL node is returned as the value.
4439 Exception: for arrays where the length is not specified,
4440 the type is left null, to be filled in by `finish_decl'.
4442 Function definitions do not come here; they go to start_function
4443 instead. However, external and forward declarations of functions
4444 do go through here. Structure field declarations are done by
4445 grokfield and not through here. */
4448 start_decl (struct c_declarator
*declarator
, struct c_declspecs
*declspecs
,
4449 bool initialized
, tree attributes
)
4453 tree expr
= NULL_TREE
;
4454 enum deprecated_states deprecated_state
= DEPRECATED_NORMAL
;
4456 /* An object declared as __attribute__((deprecated)) suppresses
4457 warnings of uses of other deprecated items. */
4458 if (lookup_attribute ("deprecated", attributes
))
4459 deprecated_state
= DEPRECATED_SUPPRESS
;
4461 decl
= grokdeclarator (declarator
, declspecs
,
4462 NORMAL
, initialized
, NULL
, &attributes
, &expr
, NULL
,
4464 if (!decl
|| decl
== error_mark_node
)
4468 add_stmt (fold_convert (void_type_node
, expr
));
4470 if (TREE_CODE (decl
) != FUNCTION_DECL
&& MAIN_NAME_P (DECL_NAME (decl
)))
4471 warning (OPT_Wmain
, "%q+D is usually a function", decl
);
4474 /* Is it valid for this decl to have an initializer at all?
4475 If not, set INITIALIZED to zero, which will indirectly
4476 tell 'finish_decl' to ignore the initializer once it is parsed. */
4477 switch (TREE_CODE (decl
))
4480 error ("typedef %qD is initialized (use __typeof__ instead)", decl
);
4485 error ("function %qD is initialized like a variable", decl
);
4490 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
4491 error ("parameter %qD is initialized", decl
);
4496 /* Don't allow initializations for incomplete types except for
4497 arrays which might be completed by the initialization. */
4499 /* This can happen if the array size is an undefined macro.
4500 We already gave a warning, so we don't need another one. */
4501 if (TREE_TYPE (decl
) == error_mark_node
)
4503 else if (COMPLETE_TYPE_P (TREE_TYPE (decl
)))
4505 /* A complete type is ok if size is fixed. */
4507 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl
))) != INTEGER_CST
4508 || C_DECL_VARIABLE_SIZE (decl
))
4510 error ("variable-sized object may not be initialized");
4514 else if (TREE_CODE (TREE_TYPE (decl
)) != ARRAY_TYPE
)
4516 error ("variable %qD has initializer but incomplete type", decl
);
4519 else if (C_DECL_VARIABLE_SIZE (decl
))
4521 /* Although C99 is unclear about whether incomplete arrays
4522 of VLAs themselves count as VLAs, it does not make
4523 sense to permit them to be initialized given that
4524 ordinary VLAs may not be initialized. */
4525 error ("variable-sized object may not be initialized");
4532 if (current_scope
== file_scope
)
4533 TREE_STATIC (decl
) = 1;
4535 /* Tell 'pushdecl' this is an initialized decl
4536 even though we don't yet have the initializer expression.
4537 Also tell 'finish_decl' it may store the real initializer. */
4538 DECL_INITIAL (decl
) = error_mark_node
;
4541 /* If this is a function declaration, write a record describing it to the
4542 prototypes file (if requested). */
4544 if (TREE_CODE (decl
) == FUNCTION_DECL
)
4545 gen_aux_info_record (decl
, 0, 0, prototype_p (TREE_TYPE (decl
)));
4547 /* ANSI specifies that a tentative definition which is not merged with
4548 a non-tentative definition behaves exactly like a definition with an
4549 initializer equal to zero. (Section 3.7.2)
4551 -fno-common gives strict ANSI behavior, though this tends to break
4552 a large body of code that grew up without this rule.
4554 Thread-local variables are never common, since there's no entrenched
4555 body of code to break, and it allows more efficient variable references
4556 in the presence of dynamic linking. */
4558 if (TREE_CODE (decl
) == VAR_DECL
4560 && TREE_PUBLIC (decl
)
4561 && !DECL_THREAD_LOCAL_P (decl
)
4563 DECL_COMMON (decl
) = 1;
4565 /* Set attributes here so if duplicate decl, will have proper attributes. */
4566 c_decl_attributes (&decl
, attributes
, 0);
4568 /* Handle gnu_inline attribute. */
4569 if (declspecs
->inline_p
4570 && !flag_gnu89_inline
4571 && TREE_CODE (decl
) == FUNCTION_DECL
4572 && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl
))
4573 || current_function_decl
))
4575 if (declspecs
->storage_class
== csc_auto
&& current_scope
!= file_scope
)
4577 else if (declspecs
->storage_class
!= csc_static
)
4578 DECL_EXTERNAL (decl
) = !DECL_EXTERNAL (decl
);
4581 if (TREE_CODE (decl
) == FUNCTION_DECL
4582 && targetm
.calls
.promote_prototypes (TREE_TYPE (decl
)))
4584 struct c_declarator
*ce
= declarator
;
4586 if (ce
->kind
== cdk_pointer
)
4587 ce
= declarator
->declarator
;
4588 if (ce
->kind
== cdk_function
)
4590 tree args
= ce
->u
.arg_info
->parms
;
4591 for (; args
; args
= DECL_CHAIN (args
))
4593 tree type
= TREE_TYPE (args
);
4594 if (type
&& INTEGRAL_TYPE_P (type
)
4595 && TYPE_PRECISION (type
) < TYPE_PRECISION (integer_type_node
))
4596 DECL_ARG_TYPE (args
) = c_type_promotes_to (type
);
4601 if (TREE_CODE (decl
) == FUNCTION_DECL
4602 && DECL_DECLARED_INLINE_P (decl
)
4603 && DECL_UNINLINABLE (decl
)
4604 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl
)))
4605 warning (OPT_Wattributes
, "inline function %q+D given attribute noinline",
4608 /* C99 6.7.4p3: An inline definition of a function with external
4609 linkage shall not contain a definition of a modifiable object
4610 with static storage duration... */
4611 if (TREE_CODE (decl
) == VAR_DECL
4612 && current_scope
!= file_scope
4613 && TREE_STATIC (decl
)
4614 && !TREE_READONLY (decl
)
4615 && DECL_DECLARED_INLINE_P (current_function_decl
)
4616 && DECL_EXTERNAL (current_function_decl
))
4617 record_inline_static (input_location
, current_function_decl
,
4618 decl
, csi_modifiable
);
4620 if (c_dialect_objc ()
4621 && VAR_OR_FUNCTION_DECL_P (decl
))
4622 objc_check_global_decl (decl
);
4624 /* Add this decl to the current scope.
4625 TEM may equal DECL or it may be a previous decl of the same name. */
4626 tem
= pushdecl (decl
);
4628 if (initialized
&& DECL_EXTERNAL (tem
))
4630 DECL_EXTERNAL (tem
) = 0;
4631 TREE_STATIC (tem
) = 1;
4637 /* Subroutine of finish_decl. TYPE is the type of an uninitialized object
4638 DECL or the non-array element type if DECL is an uninitialized array.
4639 If that type has a const member, diagnose this. */
4642 diagnose_uninitialized_cst_member (tree decl
, tree type
)
4645 for (field
= TYPE_FIELDS (type
); field
; field
= TREE_CHAIN (field
))
4648 if (TREE_CODE (field
) != FIELD_DECL
)
4650 field_type
= strip_array_types (TREE_TYPE (field
));
4652 if (TYPE_QUALS (field_type
) & TYPE_QUAL_CONST
)
4654 warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wc___compat
,
4655 "uninitialized const member in %qT is invalid in C++",
4656 strip_array_types (TREE_TYPE (decl
)));
4657 inform (DECL_SOURCE_LOCATION (field
), "%qD should be initialized", field
);
4660 if (TREE_CODE (field_type
) == RECORD_TYPE
4661 || TREE_CODE (field_type
) == UNION_TYPE
)
4662 diagnose_uninitialized_cst_member (decl
, field_type
);
4666 /* Finish processing of a declaration;
4667 install its initial value.
4668 If ORIGTYPE is not NULL_TREE, it is the original type of INIT.
4669 If the length of an array type is not known before,
4670 it must be determined now, from the initial value, or it is an error.
4672 INIT_LOC is the location of the initial value. */
4675 finish_decl (tree decl
, location_t init_loc
, tree init
,
4676 tree origtype
, tree asmspec_tree
)
4679 bool was_incomplete
= (DECL_SIZE (decl
) == 0);
4680 const char *asmspec
= 0;
4682 /* If a name was specified, get the string. */
4683 if (VAR_OR_FUNCTION_DECL_P (decl
)
4684 && DECL_FILE_SCOPE_P (decl
))
4685 asmspec_tree
= maybe_apply_renaming_pragma (decl
, asmspec_tree
);
4687 asmspec
= TREE_STRING_POINTER (asmspec_tree
);
4689 if (TREE_CODE (decl
) == VAR_DECL
4690 && TREE_STATIC (decl
)
4691 && global_bindings_p ())
4692 /* So decl is a global variable. Record the types it uses
4693 so that we can decide later to emit debug info for them. */
4694 record_types_used_by_current_var_decl (decl
);
4696 /* If `start_decl' didn't like having an initialization, ignore it now. */
4697 if (init
!= 0 && DECL_INITIAL (decl
) == 0)
4700 /* Don't crash if parm is initialized. */
4701 if (TREE_CODE (decl
) == PARM_DECL
)
4705 store_init_value (init_loc
, decl
, init
, origtype
);
4707 if (c_dialect_objc () && (VAR_OR_FUNCTION_DECL_P (decl
)
4708 || TREE_CODE (decl
) == FIELD_DECL
))
4709 objc_check_decl (decl
);
4711 type
= TREE_TYPE (decl
);
4713 /* Deduce size of array from initialization, if not already known. */
4714 if (TREE_CODE (type
) == ARRAY_TYPE
4715 && TYPE_DOMAIN (type
) == 0
4716 && TREE_CODE (decl
) != TYPE_DECL
)
4719 = (TREE_STATIC (decl
)
4720 /* Even if pedantic, an external linkage array
4721 may have incomplete type at first. */
4722 ? pedantic
&& !TREE_PUBLIC (decl
)
4723 : !DECL_EXTERNAL (decl
));
4725 = complete_array_type (&TREE_TYPE (decl
), DECL_INITIAL (decl
),
4728 /* Get the completed type made by complete_array_type. */
4729 type
= TREE_TYPE (decl
);
4734 error ("initializer fails to determine size of %q+D", decl
);
4739 error ("array size missing in %q+D", decl
);
4740 /* If a `static' var's size isn't known,
4741 make it extern as well as static, so it does not get
4743 If it is not `static', then do not mark extern;
4744 finish_incomplete_decl will give it a default size
4745 and it will get allocated. */
4746 else if (!pedantic
&& TREE_STATIC (decl
) && !TREE_PUBLIC (decl
))
4747 DECL_EXTERNAL (decl
) = 1;
4751 error ("zero or negative size array %q+D", decl
);
4755 /* For global variables, update the copy of the type that
4756 exists in the binding. */
4757 if (TREE_PUBLIC (decl
))
4759 struct c_binding
*b_ext
= I_SYMBOL_BINDING (DECL_NAME (decl
));
4760 while (b_ext
&& !B_IN_EXTERNAL_SCOPE (b_ext
))
4761 b_ext
= b_ext
->shadowed
;
4764 if (b_ext
->u
.type
&& comptypes (b_ext
->u
.type
, type
))
4765 b_ext
->u
.type
= composite_type (b_ext
->u
.type
, type
);
4767 b_ext
->u
.type
= type
;
4776 if (DECL_INITIAL (decl
))
4777 TREE_TYPE (DECL_INITIAL (decl
)) = type
;
4779 relayout_decl (decl
);
4782 if (TREE_CODE (decl
) == VAR_DECL
)
4784 if (init
&& TREE_CODE (init
) == CONSTRUCTOR
)
4785 add_flexible_array_elts_to_size (decl
, init
);
4787 if (DECL_SIZE (decl
) == 0 && TREE_TYPE (decl
) != error_mark_node
4788 && COMPLETE_TYPE_P (TREE_TYPE (decl
)))
4789 layout_decl (decl
, 0);
4791 if (DECL_SIZE (decl
) == 0
4792 /* Don't give an error if we already gave one earlier. */
4793 && TREE_TYPE (decl
) != error_mark_node
4794 && (TREE_STATIC (decl
)
4795 /* A static variable with an incomplete type
4796 is an error if it is initialized.
4797 Also if it is not file scope.
4798 Otherwise, let it through, but if it is not `extern'
4799 then it may cause an error message later. */
4800 ? (DECL_INITIAL (decl
) != 0
4801 || !DECL_FILE_SCOPE_P (decl
))
4802 /* An automatic variable with an incomplete type
4804 : !DECL_EXTERNAL (decl
)))
4806 error ("storage size of %q+D isn%'t known", decl
);
4807 TREE_TYPE (decl
) = error_mark_node
;
4810 if ((DECL_EXTERNAL (decl
) || TREE_STATIC (decl
))
4811 && DECL_SIZE (decl
) != 0)
4813 if (TREE_CODE (DECL_SIZE (decl
)) == INTEGER_CST
)
4814 constant_expression_warning (DECL_SIZE (decl
));
4817 error ("storage size of %q+D isn%'t constant", decl
);
4818 TREE_TYPE (decl
) = error_mark_node
;
4822 if (TREE_USED (type
))
4824 TREE_USED (decl
) = 1;
4825 DECL_READ_P (decl
) = 1;
4829 /* If this is a function and an assembler name is specified, reset DECL_RTL
4830 so we can give it its new name. Also, update builtin_decl if it
4831 was a normal built-in. */
4832 if (TREE_CODE (decl
) == FUNCTION_DECL
&& asmspec
)
4834 if (DECL_BUILT_IN_CLASS (decl
) == BUILT_IN_NORMAL
)
4835 set_builtin_user_assembler_name (decl
, asmspec
);
4836 set_user_assembler_name (decl
, asmspec
);
4839 /* If #pragma weak was used, mark the decl weak now. */
4840 maybe_apply_pragma_weak (decl
);
4842 /* Output the assembler code and/or RTL code for variables and functions,
4843 unless the type is an undefined structure or union.
4844 If not, it will get done when the type is completed. */
4846 if (VAR_OR_FUNCTION_DECL_P (decl
))
4848 /* Determine the ELF visibility. */
4849 if (TREE_PUBLIC (decl
))
4850 c_determine_visibility (decl
);
4852 /* This is a no-op in c-lang.c or something real in objc-act.c. */
4853 if (c_dialect_objc ())
4854 objc_check_decl (decl
);
4858 /* If this is not a static variable, issue a warning.
4859 It doesn't make any sense to give an ASMSPEC for an
4860 ordinary, non-register local variable. Historically,
4861 GCC has accepted -- but ignored -- the ASMSPEC in
4863 if (!DECL_FILE_SCOPE_P (decl
)
4864 && TREE_CODE (decl
) == VAR_DECL
4865 && !C_DECL_REGISTER (decl
)
4866 && !TREE_STATIC (decl
))
4867 warning (0, "ignoring asm-specifier for non-static local "
4868 "variable %q+D", decl
);
4870 set_user_assembler_name (decl
, asmspec
);
4873 if (DECL_FILE_SCOPE_P (decl
))
4875 if (DECL_INITIAL (decl
) == NULL_TREE
4876 || DECL_INITIAL (decl
) == error_mark_node
)
4877 /* Don't output anything
4878 when a tentative file-scope definition is seen.
4879 But at end of compilation, do output code for them. */
4880 DECL_DEFER_OUTPUT (decl
) = 1;
4881 if (asmspec
&& C_DECL_REGISTER (decl
))
4882 DECL_HARD_REGISTER (decl
) = 1;
4883 rest_of_decl_compilation (decl
, true, 0);
4887 /* In conjunction with an ASMSPEC, the `register'
4888 keyword indicates that we should place the variable
4889 in a particular register. */
4890 if (asmspec
&& C_DECL_REGISTER (decl
))
4892 DECL_HARD_REGISTER (decl
) = 1;
4893 /* This cannot be done for a structure with volatile
4894 fields, on which DECL_REGISTER will have been
4896 if (!DECL_REGISTER (decl
))
4897 error ("cannot put object with volatile field into register");
4900 if (TREE_CODE (decl
) != FUNCTION_DECL
)
4902 /* If we're building a variable sized type, and we might be
4903 reachable other than via the top of the current binding
4904 level, then create a new BIND_EXPR so that we deallocate
4905 the object at the right time. */
4906 /* Note that DECL_SIZE can be null due to errors. */
4907 if (DECL_SIZE (decl
)
4908 && !TREE_CONSTANT (DECL_SIZE (decl
))
4909 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list
))
4912 bind
= build3 (BIND_EXPR
, void_type_node
, NULL
, NULL
, NULL
);
4913 TREE_SIDE_EFFECTS (bind
) = 1;
4915 BIND_EXPR_BODY (bind
) = push_stmt_list ();
4917 add_stmt (build_stmt (DECL_SOURCE_LOCATION (decl
),
4923 if (!DECL_FILE_SCOPE_P (decl
))
4925 /* Recompute the RTL of a local array now
4926 if it used to be an incomplete type. */
4928 && !TREE_STATIC (decl
) && !DECL_EXTERNAL (decl
))
4930 /* If we used it already as memory, it must stay in memory. */
4931 TREE_ADDRESSABLE (decl
) = TREE_USED (decl
);
4932 /* If it's still incomplete now, no init will save it. */
4933 if (DECL_SIZE (decl
) == 0)
4934 DECL_INITIAL (decl
) = 0;
4939 if (TREE_CODE (decl
) == TYPE_DECL
)
4941 if (!DECL_FILE_SCOPE_P (decl
)
4942 && variably_modified_type_p (TREE_TYPE (decl
), NULL_TREE
))
4943 add_stmt (build_stmt (DECL_SOURCE_LOCATION (decl
), DECL_EXPR
, decl
));
4945 rest_of_decl_compilation (decl
, DECL_FILE_SCOPE_P (decl
), 0);
4948 /* Install a cleanup (aka destructor) if one was given. */
4949 if (TREE_CODE (decl
) == VAR_DECL
&& !TREE_STATIC (decl
))
4951 tree attr
= lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl
));
4954 tree cleanup_id
= TREE_VALUE (TREE_VALUE (attr
));
4955 tree cleanup_decl
= lookup_name (cleanup_id
);
4957 vec
<tree
, va_gc
> *v
;
4959 /* Build "cleanup(&decl)" for the destructor. */
4960 cleanup
= build_unary_op (input_location
, ADDR_EXPR
, decl
, 0);
4962 v
->quick_push (cleanup
);
4963 cleanup
= c_build_function_call_vec (DECL_SOURCE_LOCATION (decl
),
4964 vNULL
, cleanup_decl
, v
, NULL
);
4967 /* Don't warn about decl unused; the cleanup uses it. */
4968 TREE_USED (decl
) = 1;
4969 TREE_USED (cleanup_decl
) = 1;
4970 DECL_READ_P (decl
) = 1;
4972 push_cleanup (decl
, cleanup
, false);
4977 && TREE_CODE (decl
) == VAR_DECL
4978 && !DECL_EXTERNAL (decl
)
4979 && DECL_INITIAL (decl
) == NULL_TREE
)
4981 type
= strip_array_types (type
);
4982 if (TREE_READONLY (decl
))
4983 warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wc___compat
,
4984 "uninitialized const %qD is invalid in C++", decl
);
4985 else if ((TREE_CODE (type
) == RECORD_TYPE
4986 || TREE_CODE (type
) == UNION_TYPE
)
4987 && C_TYPE_FIELDS_READONLY (type
))
4988 diagnose_uninitialized_cst_member (decl
, type
);
4991 invoke_plugin_callbacks (PLUGIN_FINISH_DECL
, decl
);
4994 /* Given a parsed parameter declaration, decode it into a PARM_DECL.
4995 EXPR is NULL or a pointer to an expression that needs to be
4996 evaluated for the side effects of array size expressions in the
5000 grokparm (const struct c_parm
*parm
, tree
*expr
)
5002 tree attrs
= parm
->attrs
;
5003 tree decl
= grokdeclarator (parm
->declarator
, parm
->specs
, PARM
, false,
5004 NULL
, &attrs
, expr
, NULL
, DEPRECATED_NORMAL
);
5006 decl_attributes (&decl
, attrs
, 0);
5011 /* Given a parsed parameter declaration, decode it into a PARM_DECL
5012 and push that on the current scope. EXPR is a pointer to an
5013 expression that needs to be evaluated for the side effects of array
5014 size expressions in the parameters. */
5017 push_parm_decl (const struct c_parm
*parm
, tree
*expr
)
5019 tree attrs
= parm
->attrs
;
5022 decl
= grokdeclarator (parm
->declarator
, parm
->specs
, PARM
, false, NULL
,
5023 &attrs
, expr
, NULL
, DEPRECATED_NORMAL
);
5024 decl_attributes (&decl
, attrs
, 0);
5026 decl
= pushdecl (decl
);
5028 finish_decl (decl
, input_location
, NULL_TREE
, NULL_TREE
, NULL_TREE
);
5031 /* Mark all the parameter declarations to date as forward decls.
5032 Also diagnose use of this extension. */
5035 mark_forward_parm_decls (void)
5037 struct c_binding
*b
;
5039 if (pedantic
&& !current_scope
->warned_forward_parm_decls
)
5041 pedwarn (input_location
, OPT_Wpedantic
,
5042 "ISO C forbids forward parameter declarations");
5043 current_scope
->warned_forward_parm_decls
= true;
5046 for (b
= current_scope
->bindings
; b
; b
= b
->prev
)
5047 if (TREE_CODE (b
->decl
) == PARM_DECL
)
5048 TREE_ASM_WRITTEN (b
->decl
) = 1;
5051 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
5052 literal, which may be an incomplete array type completed by the
5053 initializer; INIT is a CONSTRUCTOR at LOC that initializes the compound
5054 literal. NON_CONST is true if the initializers contain something
5055 that cannot occur in a constant expression. */
5058 build_compound_literal (location_t loc
, tree type
, tree init
, bool non_const
)
5060 /* We do not use start_decl here because we have a type, not a declarator;
5061 and do not use finish_decl because the decl should be stored inside
5062 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_EXPR. */
5067 if (type
== error_mark_node
5068 || init
== error_mark_node
)
5069 return error_mark_node
;
5071 decl
= build_decl (loc
, VAR_DECL
, NULL_TREE
, type
);
5072 DECL_EXTERNAL (decl
) = 0;
5073 TREE_PUBLIC (decl
) = 0;
5074 TREE_STATIC (decl
) = (current_scope
== file_scope
);
5075 DECL_CONTEXT (decl
) = current_function_decl
;
5076 TREE_USED (decl
) = 1;
5077 DECL_READ_P (decl
) = 1;
5078 TREE_TYPE (decl
) = type
;
5079 TREE_READONLY (decl
) = (TYPE_READONLY (type
)
5080 || (TREE_CODE (type
) == ARRAY_TYPE
5081 && TYPE_READONLY (TREE_TYPE (type
))));
5082 store_init_value (loc
, decl
, init
, NULL_TREE
);
5084 if (TREE_CODE (type
) == ARRAY_TYPE
&& !COMPLETE_TYPE_P (type
))
5086 int failure
= complete_array_type (&TREE_TYPE (decl
),
5087 DECL_INITIAL (decl
), true);
5088 /* If complete_array_type returns 3, it means that the
5089 initial value of the compound literal is empty. Allow it. */
5090 gcc_assert (failure
== 0 || failure
== 3);
5092 type
= TREE_TYPE (decl
);
5093 TREE_TYPE (DECL_INITIAL (decl
)) = type
;
5096 if (type
== error_mark_node
|| !COMPLETE_TYPE_P (type
))
5098 c_incomplete_type_error (NULL_TREE
, type
);
5099 return error_mark_node
;
5102 stmt
= build_stmt (DECL_SOURCE_LOCATION (decl
), DECL_EXPR
, decl
);
5103 complit
= build1 (COMPOUND_LITERAL_EXPR
, type
, stmt
);
5104 TREE_SIDE_EFFECTS (complit
) = 1;
5106 layout_decl (decl
, 0);
5108 if (TREE_STATIC (decl
))
5110 /* This decl needs a name for the assembler output. */
5111 set_compound_literal_name (decl
);
5112 DECL_DEFER_OUTPUT (decl
) = 1;
5113 DECL_COMDAT (decl
) = 1;
5114 DECL_ARTIFICIAL (decl
) = 1;
5115 DECL_IGNORED_P (decl
) = 1;
5117 rest_of_decl_compilation (decl
, 1, 0);
5122 complit
= build2 (C_MAYBE_CONST_EXPR
, type
, NULL
, complit
);
5123 C_MAYBE_CONST_EXPR_NON_CONST (complit
) = 1;
5129 /* Check the type of a compound literal. Here we just check that it
5130 is valid for C++. */
5133 check_compound_literal_type (location_t loc
, struct c_type_name
*type_name
)
5136 && (type_name
->specs
->typespec_kind
== ctsk_tagdef
5137 || type_name
->specs
->typespec_kind
== ctsk_tagfirstref
))
5138 warning_at (loc
, OPT_Wc___compat
,
5139 "defining a type in a compound literal is invalid in C++");
5142 /* Determine whether TYPE is a structure with a flexible array member,
5143 or a union containing such a structure (possibly recursively). */
5146 flexible_array_type_p (tree type
)
5149 switch (TREE_CODE (type
))
5152 x
= TYPE_FIELDS (type
);
5155 while (DECL_CHAIN (x
) != NULL_TREE
)
5157 if (TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
5158 && TYPE_SIZE (TREE_TYPE (x
)) == NULL_TREE
5159 && TYPE_DOMAIN (TREE_TYPE (x
)) != NULL_TREE
5160 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x
))) == NULL_TREE
)
5164 for (x
= TYPE_FIELDS (type
); x
!= NULL_TREE
; x
= DECL_CHAIN (x
))
5166 if (flexible_array_type_p (TREE_TYPE (x
)))
5175 /* Performs sanity checks on the TYPE and WIDTH of the bit-field NAME,
5176 replacing with appropriate values if they are invalid. */
5178 check_bitfield_type_and_width (tree
*type
, tree
*width
, tree orig_name
)
5181 unsigned int max_width
;
5182 unsigned HOST_WIDE_INT w
;
5183 const char *name
= (orig_name
5184 ? identifier_to_locale (IDENTIFIER_POINTER (orig_name
))
5185 : _("<anonymous>"));
5187 /* Detect and ignore out of range field width and process valid
5189 if (!INTEGRAL_TYPE_P (TREE_TYPE (*width
)))
5191 error ("bit-field %qs width not an integer constant", name
);
5192 *width
= integer_one_node
;
5196 if (TREE_CODE (*width
) != INTEGER_CST
)
5198 *width
= c_fully_fold (*width
, false, NULL
);
5199 if (TREE_CODE (*width
) == INTEGER_CST
)
5200 pedwarn (input_location
, OPT_Wpedantic
,
5201 "bit-field %qs width not an integer constant expression",
5204 if (TREE_CODE (*width
) != INTEGER_CST
)
5206 error ("bit-field %qs width not an integer constant", name
);
5207 *width
= integer_one_node
;
5209 constant_expression_warning (*width
);
5210 if (tree_int_cst_sgn (*width
) < 0)
5212 error ("negative width in bit-field %qs", name
);
5213 *width
= integer_one_node
;
5215 else if (integer_zerop (*width
) && orig_name
)
5217 error ("zero width for bit-field %qs", name
);
5218 *width
= integer_one_node
;
5222 /* Detect invalid bit-field type. */
5223 if (TREE_CODE (*type
) != INTEGER_TYPE
5224 && TREE_CODE (*type
) != BOOLEAN_TYPE
5225 && TREE_CODE (*type
) != ENUMERAL_TYPE
)
5227 error ("bit-field %qs has invalid type", name
);
5228 *type
= unsigned_type_node
;
5231 type_mv
= TYPE_MAIN_VARIANT (*type
);
5232 if (!in_system_header_at (input_location
)
5233 && type_mv
!= integer_type_node
5234 && type_mv
!= unsigned_type_node
5235 && type_mv
!= boolean_type_node
)
5236 pedwarn_c90 (input_location
, OPT_Wpedantic
,
5237 "type of bit-field %qs is a GCC extension", name
);
5239 max_width
= TYPE_PRECISION (*type
);
5241 if (0 < compare_tree_int (*width
, max_width
))
5243 error ("width of %qs exceeds its type", name
);
5245 *width
= build_int_cst (integer_type_node
, w
);
5248 w
= tree_to_uhwi (*width
);
5250 if (TREE_CODE (*type
) == ENUMERAL_TYPE
)
5252 struct lang_type
*lt
= TYPE_LANG_SPECIFIC (*type
);
5254 || w
< tree_int_cst_min_precision (lt
->enum_min
, TYPE_SIGN (*type
))
5255 || w
< tree_int_cst_min_precision (lt
->enum_max
, TYPE_SIGN (*type
)))
5256 warning (0, "%qs is narrower than values of its type", name
);
5262 /* Print warning about variable length array if necessary. */
5265 warn_variable_length_array (tree name
, tree size
)
5267 if (TREE_CONSTANT (size
))
5270 pedwarn_c90 (input_location
, OPT_Wvla
,
5271 "ISO C90 forbids array %qE whose size "
5272 "can%'t be evaluated", name
);
5274 pedwarn_c90 (input_location
, OPT_Wvla
, "ISO C90 forbids array "
5275 "whose size can%'t be evaluated");
5280 pedwarn_c90 (input_location
, OPT_Wvla
,
5281 "ISO C90 forbids variable length array %qE", name
);
5283 pedwarn_c90 (input_location
, OPT_Wvla
, "ISO C90 forbids variable "
5288 /* Print warning about defaulting to int if necessary. */
5291 warn_defaults_to (location_t location
, int opt
, const char *gmsgid
, ...)
5293 diagnostic_info diagnostic
;
5296 va_start (ap
, gmsgid
);
5297 diagnostic_set_info (&diagnostic
, gmsgid
, &ap
, location
,
5298 flag_isoc99
? DK_PEDWARN
: DK_WARNING
);
5299 diagnostic
.option_index
= opt
;
5300 report_diagnostic (&diagnostic
);
5304 /* Given declspecs and a declarator,
5305 determine the name and type of the object declared
5306 and construct a ..._DECL node for it.
5307 (In one case we can return a ..._TYPE node instead.
5308 For invalid input we sometimes return 0.)
5310 DECLSPECS is a c_declspecs structure for the declaration specifiers.
5312 DECL_CONTEXT says which syntactic context this declaration is in:
5313 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
5314 FUNCDEF for a function definition. Like NORMAL but a few different
5315 error messages in each case. Return value may be zero meaning
5316 this definition is too screwy to try to parse.
5317 PARM for a parameter declaration (either within a function prototype
5318 or before a function body). Make a PARM_DECL, or return void_type_node.
5319 TYPENAME if for a typename (in a cast or sizeof).
5320 Don't make a DECL node; just return the ..._TYPE node.
5321 FIELD for a struct or union field; make a FIELD_DECL.
5322 INITIALIZED is true if the decl has an initializer.
5323 WIDTH is non-NULL for bit-fields, and is a pointer to an INTEGER_CST node
5324 representing the width of the bit-field.
5325 DECL_ATTRS points to the list of attributes that should be added to this
5326 decl. Any nested attributes that belong on the decl itself will be
5328 If EXPR is not NULL, any expressions that need to be evaluated as
5329 part of evaluating variably modified types will be stored in *EXPR.
5330 If EXPR_CONST_OPERANDS is not NULL, *EXPR_CONST_OPERANDS will be
5331 set to indicate whether operands in *EXPR can be used in constant
5333 DEPRECATED_STATE is a deprecated_states value indicating whether
5334 deprecation warnings should be suppressed.
5336 In the TYPENAME case, DECLARATOR is really an absolute declarator.
5337 It may also be so in the PARM case, for a prototype where the
5338 argument type is specified but not the name.
5340 This function is where the complicated C meanings of `static'
5341 and `extern' are interpreted. */
5344 grokdeclarator (const struct c_declarator
*declarator
,
5345 struct c_declspecs
*declspecs
,
5346 enum decl_context decl_context
, bool initialized
, tree
*width
,
5347 tree
*decl_attrs
, tree
*expr
, bool *expr_const_operands
,
5348 enum deprecated_states deprecated_state
)
5350 tree type
= declspecs
->type
;
5351 bool threadp
= declspecs
->thread_p
;
5352 enum c_storage_class storage_class
= declspecs
->storage_class
;
5357 int type_quals
= TYPE_UNQUALIFIED
;
5358 tree name
= NULL_TREE
;
5359 bool funcdef_flag
= false;
5360 bool funcdef_syntax
= false;
5361 bool size_varies
= false;
5362 tree decl_attr
= declspecs
->decl_attr
;
5363 int array_ptr_quals
= TYPE_UNQUALIFIED
;
5364 tree array_ptr_attrs
= NULL_TREE
;
5365 int array_parm_static
= 0;
5366 bool array_parm_vla_unspec_p
= false;
5367 tree returned_attrs
= NULL_TREE
;
5368 bool bitfield
= width
!= NULL
;
5370 struct c_arg_info
*arg_info
= 0;
5371 addr_space_t as1
, as2
, address_space
;
5372 location_t loc
= UNKNOWN_LOCATION
;
5375 bool expr_const_operands_dummy
;
5376 enum c_declarator_kind first_non_attr_kind
;
5377 unsigned int alignas_align
= 0;
5379 if (TREE_CODE (type
) == ERROR_MARK
)
5380 return error_mark_node
;
5383 if (expr_const_operands
== NULL
)
5384 expr_const_operands
= &expr_const_operands_dummy
;
5386 *expr
= declspecs
->expr
;
5387 *expr_const_operands
= declspecs
->expr_const_operands
;
5389 if (decl_context
== FUNCDEF
)
5390 funcdef_flag
= true, decl_context
= NORMAL
;
5392 /* Look inside a declarator for the name being declared
5393 and get it as an IDENTIFIER_NODE, for an error message. */
5395 const struct c_declarator
*decl
= declarator
;
5397 first_non_attr_kind
= cdk_attrs
;
5407 funcdef_syntax
= (decl
->kind
== cdk_function
);
5408 decl
= decl
->declarator
;
5409 if (first_non_attr_kind
== cdk_attrs
)
5410 first_non_attr_kind
= decl
->kind
;
5414 decl
= decl
->declarator
;
5421 if (first_non_attr_kind
== cdk_attrs
)
5422 first_non_attr_kind
= decl
->kind
;
5431 gcc_assert (decl_context
== PARM
5432 || decl_context
== TYPENAME
5433 || (decl_context
== FIELD
5434 && declarator
->kind
== cdk_id
));
5435 gcc_assert (!initialized
);
5439 /* A function definition's declarator must have the form of
5440 a function declarator. */
5442 if (funcdef_flag
&& !funcdef_syntax
)
5445 /* If this looks like a function definition, make it one,
5446 even if it occurs where parms are expected.
5447 Then store_parm_decls will reject it and not use it as a parm. */
5448 if (decl_context
== NORMAL
&& !funcdef_flag
&& current_scope
->parm_flag
)
5449 decl_context
= PARM
;
5451 if (declspecs
->deprecated_p
&& deprecated_state
!= DEPRECATED_SUPPRESS
)
5452 warn_deprecated_use (declspecs
->type
, declspecs
->decl_attr
);
5454 if ((decl_context
== NORMAL
|| decl_context
== FIELD
)
5455 && current_scope
== file_scope
5456 && variably_modified_type_p (type
, NULL_TREE
))
5459 error_at (loc
, "variably modified %qE at file scope", name
);
5461 error_at (loc
, "variably modified field at file scope");
5462 type
= integer_type_node
;
5465 size_varies
= C_TYPE_VARIABLE_SIZE (type
) != 0;
5467 /* Diagnose defaulting to "int". */
5469 if (declspecs
->default_int_p
&& !in_system_header_at (input_location
))
5471 /* Issue a warning if this is an ISO C 99 program or if
5472 -Wreturn-type and this is a function, or if -Wimplicit;
5473 prefer the former warning since it is more explicit. */
5474 if ((warn_implicit_int
|| warn_return_type
|| flag_isoc99
)
5476 warn_about_return_type
= 1;
5480 warn_defaults_to (loc
, OPT_Wimplicit_int
,
5481 "type defaults to %<int%> in declaration "
5484 warn_defaults_to (loc
, OPT_Wimplicit_int
,
5485 "type defaults to %<int%> in type name");
5489 /* Adjust the type if a bit-field is being declared,
5490 -funsigned-bitfields applied and the type is not explicitly
5492 if (bitfield
&& !flag_signed_bitfields
&& !declspecs
->explicit_signed_p
5493 && TREE_CODE (type
) == INTEGER_TYPE
)
5494 type
= unsigned_type_for (type
);
5496 /* Figure out the type qualifiers for the declaration. There are
5497 two ways a declaration can become qualified. One is something
5498 like `const int i' where the `const' is explicit. Another is
5499 something like `typedef const int CI; CI i' where the type of the
5500 declaration contains the `const'. A third possibility is that
5501 there is a type qualifier on the element type of a typedefed
5502 array type, in which case we should extract that qualifier so
5503 that c_apply_type_quals_to_decl receives the full list of
5504 qualifiers to work with (C90 is not entirely clear about whether
5505 duplicate qualifiers should be diagnosed in this case, but it
5506 seems most appropriate to do so). */
5507 element_type
= strip_array_types (type
);
5508 constp
= declspecs
->const_p
+ TYPE_READONLY (element_type
);
5509 restrictp
= declspecs
->restrict_p
+ TYPE_RESTRICT (element_type
);
5510 volatilep
= declspecs
->volatile_p
+ TYPE_VOLATILE (element_type
);
5511 atomicp
= declspecs
->atomic_p
+ TYPE_ATOMIC (element_type
);
5512 as1
= declspecs
->address_space
;
5513 as2
= TYPE_ADDR_SPACE (element_type
);
5514 address_space
= ADDR_SPACE_GENERIC_P (as1
)? as2
: as1
;
5517 pedwarn_c90 (loc
, OPT_Wpedantic
, "duplicate %<const%>");
5519 pedwarn_c90 (loc
, OPT_Wpedantic
, "duplicate %<restrict%>");
5521 pedwarn_c90 (loc
, OPT_Wpedantic
, "duplicate %<volatile%>");
5523 pedwarn_c90 (loc
, OPT_Wpedantic
, "duplicate %<_Atomic%>");
5525 if (!ADDR_SPACE_GENERIC_P (as1
) && !ADDR_SPACE_GENERIC_P (as2
) && as1
!= as2
)
5526 error_at (loc
, "conflicting named address spaces (%s vs %s)",
5527 c_addr_space_name (as1
), c_addr_space_name (as2
));
5529 if ((TREE_CODE (type
) == ARRAY_TYPE
5530 || first_non_attr_kind
== cdk_array
)
5531 && TYPE_QUALS (element_type
))
5532 type
= TYPE_MAIN_VARIANT (type
);
5533 type_quals
= ((constp
? TYPE_QUAL_CONST
: 0)
5534 | (restrictp
? TYPE_QUAL_RESTRICT
: 0)
5535 | (volatilep
? TYPE_QUAL_VOLATILE
: 0)
5536 | (atomicp
? TYPE_QUAL_ATOMIC
: 0)
5537 | ENCODE_QUAL_ADDR_SPACE (address_space
));
5539 /* Applying the _Atomic qualifier to an array type (through the use
5540 of typedefs or typeof) must be detected here. If the qualifier
5541 is introduced later, any appearance of applying it to an array is
5542 actually applying it to an element of that array. */
5543 if (atomicp
&& TREE_CODE (type
) == ARRAY_TYPE
)
5544 error_at (loc
, "%<_Atomic%>-qualified array type");
5546 /* Warn about storage classes that are invalid for certain
5547 kinds of declarations (parameters, typenames, etc.). */
5551 || storage_class
== csc_auto
5552 || storage_class
== csc_register
5553 || storage_class
== csc_typedef
))
5555 if (storage_class
== csc_auto
)
5557 (current_scope
== file_scope
) ? 0 : OPT_Wpedantic
,
5558 "function definition declared %<auto%>");
5559 if (storage_class
== csc_register
)
5560 error_at (loc
, "function definition declared %<register%>");
5561 if (storage_class
== csc_typedef
)
5562 error_at (loc
, "function definition declared %<typedef%>");
5564 error_at (loc
, "function definition declared %qs",
5565 declspecs
->thread_gnu_p
? "__thread" : "_Thread_local");
5567 if (storage_class
== csc_auto
5568 || storage_class
== csc_register
5569 || storage_class
== csc_typedef
)
5570 storage_class
= csc_none
;
5572 else if (decl_context
!= NORMAL
&& (storage_class
!= csc_none
|| threadp
))
5574 if (decl_context
== PARM
&& storage_class
== csc_register
)
5578 switch (decl_context
)
5582 error_at (loc
, "storage class specified for structure "
5585 error_at (loc
, "storage class specified for structure field");
5589 error_at (loc
, "storage class specified for parameter %qE",
5592 error_at (loc
, "storage class specified for unnamed parameter");
5595 error_at (loc
, "storage class specified for typename");
5598 storage_class
= csc_none
;
5602 else if (storage_class
== csc_extern
5606 /* 'extern' with initialization is invalid if not at file scope. */
5607 if (current_scope
== file_scope
)
5609 /* It is fine to have 'extern const' when compiling at C
5610 and C++ intersection. */
5611 if (!(warn_cxx_compat
&& constp
))
5612 warning_at (loc
, 0, "%qE initialized and declared %<extern%>",
5616 error_at (loc
, "%qE has both %<extern%> and initializer", name
);
5618 else if (current_scope
== file_scope
)
5620 if (storage_class
== csc_auto
)
5621 error_at (loc
, "file-scope declaration of %qE specifies %<auto%>",
5623 if (pedantic
&& storage_class
== csc_register
)
5624 pedwarn (input_location
, OPT_Wpedantic
,
5625 "file-scope declaration of %qE specifies %<register%>", name
);
5629 if (storage_class
== csc_extern
&& funcdef_flag
)
5630 error_at (loc
, "nested function %qE declared %<extern%>", name
);
5631 else if (threadp
&& storage_class
== csc_none
)
5633 error_at (loc
, "function-scope %qE implicitly auto and declared "
5635 declspecs
->thread_gnu_p
? "__thread" : "_Thread_local");
5640 /* Now figure out the structure of the declarator proper.
5641 Descend through it, creating more complex types, until we reach
5642 the declared identifier (or NULL_TREE, in an absolute declarator).
5643 At each stage we maintain an unqualified version of the type
5644 together with any qualifiers that should be applied to it with
5645 c_build_qualified_type; this way, array types including
5646 multidimensional array types are first built up in unqualified
5647 form and then the qualified form is created with
5648 TYPE_MAIN_VARIANT pointing to the unqualified form. */
5650 while (declarator
&& declarator
->kind
!= cdk_id
)
5652 if (type
== error_mark_node
)
5654 declarator
= declarator
->declarator
;
5658 /* Each level of DECLARATOR is either a cdk_array (for ...[..]),
5659 a cdk_pointer (for *...),
5660 a cdk_function (for ...(...)),
5661 a cdk_attrs (for nested attributes),
5662 or a cdk_id (for the name being declared
5663 or the place in an absolute declarator
5664 where the name was omitted).
5665 For the last case, we have just exited the loop.
5667 At this point, TYPE is the type of elements of an array,
5668 or for a function to return, or for a pointer to point to.
5669 After this sequence of ifs, TYPE is the type of the
5670 array or function or pointer, and DECLARATOR has had its
5671 outermost layer removed. */
5673 if (array_ptr_quals
!= TYPE_UNQUALIFIED
5674 || array_ptr_attrs
!= NULL_TREE
5675 || array_parm_static
)
5677 /* Only the innermost declarator (making a parameter be of
5678 array type which is converted to pointer type)
5679 may have static or type qualifiers. */
5680 error_at (loc
, "static or type qualifiers in non-parameter array declarator");
5681 array_ptr_quals
= TYPE_UNQUALIFIED
;
5682 array_ptr_attrs
= NULL_TREE
;
5683 array_parm_static
= 0;
5686 switch (declarator
->kind
)
5690 /* A declarator with embedded attributes. */
5691 tree attrs
= declarator
->u
.attrs
;
5692 const struct c_declarator
*inner_decl
;
5694 declarator
= declarator
->declarator
;
5695 inner_decl
= declarator
;
5696 while (inner_decl
->kind
== cdk_attrs
)
5697 inner_decl
= inner_decl
->declarator
;
5698 if (inner_decl
->kind
== cdk_id
)
5699 attr_flags
|= (int) ATTR_FLAG_DECL_NEXT
;
5700 else if (inner_decl
->kind
== cdk_function
)
5701 attr_flags
|= (int) ATTR_FLAG_FUNCTION_NEXT
;
5702 else if (inner_decl
->kind
== cdk_array
)
5703 attr_flags
|= (int) ATTR_FLAG_ARRAY_NEXT
;
5704 returned_attrs
= decl_attributes (&type
,
5705 chainon (returned_attrs
, attrs
),
5711 tree itype
= NULL_TREE
;
5712 tree size
= declarator
->u
.array
.dimen
;
5713 /* The index is a signed object `sizetype' bits wide. */
5714 tree index_type
= c_common_signed_type (sizetype
);
5716 array_ptr_quals
= declarator
->u
.array
.quals
;
5717 array_ptr_attrs
= declarator
->u
.array
.attrs
;
5718 array_parm_static
= declarator
->u
.array
.static_p
;
5719 array_parm_vla_unspec_p
= declarator
->u
.array
.vla_unspec_p
;
5721 declarator
= declarator
->declarator
;
5723 /* Check for some types that there cannot be arrays of. */
5725 if (VOID_TYPE_P (type
))
5728 error_at (loc
, "declaration of %qE as array of voids", name
);
5730 error_at (loc
, "declaration of type name as array of voids");
5731 type
= error_mark_node
;
5734 if (TREE_CODE (type
) == FUNCTION_TYPE
)
5737 error_at (loc
, "declaration of %qE as array of functions",
5740 error_at (loc
, "declaration of type name as array of "
5742 type
= error_mark_node
;
5745 if (pedantic
&& !in_system_header_at (input_location
)
5746 && flexible_array_type_p (type
))
5747 pedwarn (loc
, OPT_Wpedantic
,
5748 "invalid use of structure with flexible array member");
5750 if (size
== error_mark_node
)
5751 type
= error_mark_node
;
5753 if (type
== error_mark_node
)
5756 /* If size was specified, set ITYPE to a range-type for
5757 that size. Otherwise, ITYPE remains null. finish_decl
5758 may figure it out from an initial value. */
5762 bool size_maybe_const
= true;
5763 bool size_int_const
= (TREE_CODE (size
) == INTEGER_CST
5764 && !TREE_OVERFLOW (size
));
5765 bool this_size_varies
= false;
5767 /* Strip NON_LVALUE_EXPRs since we aren't using as an
5769 STRIP_TYPE_NOPS (size
);
5771 if (!INTEGRAL_TYPE_P (TREE_TYPE (size
)))
5774 error_at (loc
, "size of array %qE has non-integer type",
5778 "size of unnamed array has non-integer type");
5779 size
= integer_one_node
;
5782 size
= c_fully_fold (size
, false, &size_maybe_const
);
5784 if (pedantic
&& size_maybe_const
&& integer_zerop (size
))
5787 pedwarn (loc
, OPT_Wpedantic
,
5788 "ISO C forbids zero-size array %qE", name
);
5790 pedwarn (loc
, OPT_Wpedantic
,
5791 "ISO C forbids zero-size array");
5794 if (TREE_CODE (size
) == INTEGER_CST
&& size_maybe_const
)
5796 constant_expression_warning (size
);
5797 if (tree_int_cst_sgn (size
) < 0)
5800 error_at (loc
, "size of array %qE is negative", name
);
5802 error_at (loc
, "size of unnamed array is negative");
5803 size
= integer_one_node
;
5805 /* Handle a size folded to an integer constant but
5806 not an integer constant expression. */
5807 if (!size_int_const
)
5809 /* If this is a file scope declaration of an
5810 ordinary identifier, this is invalid code;
5811 diagnosing it here and not subsequently
5812 treating the type as variable-length avoids
5813 more confusing diagnostics later. */
5814 if ((decl_context
== NORMAL
|| decl_context
== FIELD
)
5815 && current_scope
== file_scope
)
5816 pedwarn (input_location
, 0,
5817 "variably modified %qE at file scope",
5820 this_size_varies
= size_varies
= true;
5821 warn_variable_length_array (name
, size
);
5824 else if ((decl_context
== NORMAL
|| decl_context
== FIELD
)
5825 && current_scope
== file_scope
)
5827 error_at (loc
, "variably modified %qE at file scope", name
);
5828 size
= integer_one_node
;
5832 /* Make sure the array size remains visibly
5833 nonconstant even if it is (eg) a const variable
5834 with known value. */
5835 this_size_varies
= size_varies
= true;
5836 warn_variable_length_array (name
, size
);
5837 if (flag_sanitize
& SANITIZE_VLA
5838 && decl_context
== NORMAL
5839 && do_ubsan_in_current_function ())
5841 /* Evaluate the array size only once. */
5842 size
= c_save_expr (size
);
5843 size
= c_fully_fold (size
, false, NULL
);
5844 size
= fold_build2 (COMPOUND_EXPR
, TREE_TYPE (size
),
5845 ubsan_instrument_vla (loc
, size
),
5850 if (integer_zerop (size
) && !this_size_varies
)
5852 /* A zero-length array cannot be represented with
5853 an unsigned index type, which is what we'll
5854 get with build_index_type. Create an
5855 open-ended range instead. */
5856 itype
= build_range_type (sizetype
, size
, NULL_TREE
);
5860 /* Arrange for the SAVE_EXPR on the inside of the
5861 MINUS_EXPR, which allows the -1 to get folded
5862 with the +1 that happens when building TYPE_SIZE. */
5864 size
= save_expr (size
);
5865 if (this_size_varies
&& TREE_CODE (size
) == INTEGER_CST
)
5866 size
= build2 (COMPOUND_EXPR
, TREE_TYPE (size
),
5867 integer_zero_node
, size
);
5869 /* Compute the maximum valid index, that is, size
5870 - 1. Do the calculation in index_type, so that
5871 if it is a variable the computations will be
5872 done in the proper mode. */
5873 itype
= fold_build2_loc (loc
, MINUS_EXPR
, index_type
,
5874 convert (index_type
, size
),
5875 convert (index_type
,
5878 /* The above overflows when size does not fit
5880 ??? While a size of INT_MAX+1 technically shouldn't
5881 cause an overflow (because we subtract 1), handling
5882 this case seems like an unnecessary complication. */
5883 if (TREE_CODE (size
) == INTEGER_CST
5884 && !int_fits_type_p (size
, index_type
))
5887 error_at (loc
, "size of array %qE is too large",
5890 error_at (loc
, "size of unnamed array is too large");
5891 type
= error_mark_node
;
5895 itype
= build_index_type (itype
);
5897 if (this_size_varies
)
5900 *expr
= build2 (COMPOUND_EXPR
, TREE_TYPE (size
),
5904 *expr_const_operands
&= size_maybe_const
;
5907 else if (decl_context
== FIELD
)
5909 bool flexible_array_member
= false;
5910 if (array_parm_vla_unspec_p
)
5911 /* Field names can in fact have function prototype
5912 scope so [*] is disallowed here through making
5913 the field variably modified, not through being
5914 something other than a declaration with function
5919 const struct c_declarator
*t
= declarator
;
5920 while (t
->kind
== cdk_attrs
)
5922 flexible_array_member
= (t
->kind
== cdk_id
);
5924 if (flexible_array_member
5925 && !in_system_header_at (input_location
))
5926 pedwarn_c90 (loc
, OPT_Wpedantic
, "ISO C90 does not "
5927 "support flexible array members");
5929 /* ISO C99 Flexible array members are effectively
5930 identical to GCC's zero-length array extension. */
5931 if (flexible_array_member
|| array_parm_vla_unspec_p
)
5932 itype
= build_range_type (sizetype
, size_zero_node
,
5935 else if (decl_context
== PARM
)
5937 if (array_parm_vla_unspec_p
)
5939 itype
= build_range_type (sizetype
, size_zero_node
, NULL_TREE
);
5943 else if (decl_context
== TYPENAME
)
5945 if (array_parm_vla_unspec_p
)
5948 warning (0, "%<[*]%> not in a declaration");
5949 /* We use this to avoid messing up with incomplete
5950 array types of the same type, that would
5951 otherwise be modified below. */
5952 itype
= build_range_type (sizetype
, size_zero_node
,
5958 /* Complain about arrays of incomplete types. */
5959 if (!COMPLETE_TYPE_P (type
))
5961 error_at (loc
, "array type has incomplete element type %qT",
5963 type
= error_mark_node
;
5966 /* When itype is NULL, a shared incomplete array type is
5967 returned for all array of a given type. Elsewhere we
5968 make sure we don't complete that type before copying
5969 it, but here we want to make sure we don't ever
5970 modify the shared type, so we gcc_assert (itype)
5973 addr_space_t as
= DECODE_QUAL_ADDR_SPACE (type_quals
);
5974 if (!ADDR_SPACE_GENERIC_P (as
) && as
!= TYPE_ADDR_SPACE (type
))
5975 type
= build_qualified_type (type
,
5976 ENCODE_QUAL_ADDR_SPACE (as
));
5978 type
= build_array_type (type
, itype
);
5981 if (type
!= error_mark_node
)
5985 /* It is ok to modify type here even if itype is
5986 NULL: if size_varies, we're in a
5987 multi-dimensional array and the inner type has
5988 variable size, so the enclosing shared array type
5990 if (size
&& TREE_CODE (size
) == INTEGER_CST
)
5992 = build_distinct_type_copy (TYPE_MAIN_VARIANT (type
));
5993 C_TYPE_VARIABLE_SIZE (type
) = 1;
5996 /* The GCC extension for zero-length arrays differs from
5997 ISO flexible array members in that sizeof yields
5999 if (size
&& integer_zerop (size
))
6002 type
= build_distinct_type_copy (TYPE_MAIN_VARIANT (type
));
6003 TYPE_SIZE (type
) = bitsize_zero_node
;
6004 TYPE_SIZE_UNIT (type
) = size_zero_node
;
6005 SET_TYPE_STRUCTURAL_EQUALITY (type
);
6007 if (array_parm_vla_unspec_p
)
6010 /* The type is complete. C99 6.7.5.2p4 */
6011 type
= build_distinct_type_copy (TYPE_MAIN_VARIANT (type
));
6012 TYPE_SIZE (type
) = bitsize_zero_node
;
6013 TYPE_SIZE_UNIT (type
) = size_zero_node
;
6014 SET_TYPE_STRUCTURAL_EQUALITY (type
);
6018 if (decl_context
!= PARM
6019 && (array_ptr_quals
!= TYPE_UNQUALIFIED
6020 || array_ptr_attrs
!= NULL_TREE
6021 || array_parm_static
))
6023 error_at (loc
, "static or type qualifiers in non-parameter array declarator");
6024 array_ptr_quals
= TYPE_UNQUALIFIED
;
6025 array_ptr_attrs
= NULL_TREE
;
6026 array_parm_static
= 0;
6032 /* Say it's a definition only for the declarator closest
6033 to the identifier, apart possibly from some
6035 bool really_funcdef
= false;
6039 const struct c_declarator
*t
= declarator
->declarator
;
6040 while (t
->kind
== cdk_attrs
)
6042 really_funcdef
= (t
->kind
== cdk_id
);
6045 /* Declaring a function type. Make sure we have a valid
6046 type for the function to return. */
6047 if (type
== error_mark_node
)
6050 size_varies
= false;
6052 /* Warn about some types functions can't return. */
6053 if (TREE_CODE (type
) == FUNCTION_TYPE
)
6056 error_at (loc
, "%qE declared as function returning a "
6059 error_at (loc
, "type name declared as function "
6060 "returning a function");
6061 type
= integer_type_node
;
6063 if (TREE_CODE (type
) == ARRAY_TYPE
)
6066 error_at (loc
, "%qE declared as function returning an array",
6069 error_at (loc
, "type name declared as function returning "
6071 type
= integer_type_node
;
6073 errmsg
= targetm
.invalid_return_type (type
);
6077 type
= integer_type_node
;
6080 /* Construct the function type and go to the next
6081 inner layer of declarator. */
6082 arg_info
= declarator
->u
.arg_info
;
6083 arg_types
= grokparms (arg_info
, really_funcdef
);
6085 /* Type qualifiers before the return type of the function
6086 qualify the return type, not the function type. */
6089 /* Type qualifiers on a function return type are
6090 normally permitted by the standard but have no
6091 effect, so give a warning at -Wreturn-type.
6092 Qualifiers on a void return type are banned on
6093 function definitions in ISO C; GCC used to used
6094 them for noreturn functions. */
6095 if (VOID_TYPE_P (type
) && really_funcdef
)
6097 "function definition has qualified void return type");
6099 warning_at (loc
, OPT_Wignored_qualifiers
,
6100 "type qualifiers ignored on function return type");
6102 type
= c_build_qualified_type (type
, type_quals
);
6104 type_quals
= TYPE_UNQUALIFIED
;
6106 type
= build_function_type (type
, arg_types
);
6107 declarator
= declarator
->declarator
;
6109 /* Set the TYPE_CONTEXTs for each tagged type which is local to
6110 the formal parameter list of this FUNCTION_TYPE to point to
6111 the FUNCTION_TYPE node itself. */
6116 FOR_EACH_VEC_SAFE_ELT_REVERSE (arg_info
->tags
, ix
, tag
)
6117 TYPE_CONTEXT (tag
->type
) = type
;
6123 /* Merge any constancy or volatility into the target type
6125 if ((type_quals
& TYPE_QUAL_ATOMIC
)
6126 && TREE_CODE (type
) == FUNCTION_TYPE
)
6129 "%<_Atomic%>-qualified function type");
6130 type_quals
&= ~TYPE_QUAL_ATOMIC
;
6132 else if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
6134 pedwarn (loc
, OPT_Wpedantic
,
6135 "ISO C forbids qualified function types");
6137 type
= c_build_qualified_type (type
, type_quals
);
6138 size_varies
= false;
6140 /* When the pointed-to type involves components of variable size,
6141 care must be taken to ensure that the size evaluation code is
6142 emitted early enough to dominate all the possible later uses
6143 and late enough for the variables on which it depends to have
6146 This is expected to happen automatically when the pointed-to
6147 type has a name/declaration of it's own, but special attention
6148 is required if the type is anonymous.
6150 We handle the NORMAL and FIELD contexts here by attaching an
6151 artificial TYPE_DECL to such pointed-to type. This forces the
6152 sizes evaluation at a safe point and ensures it is not deferred
6153 until e.g. within a deeper conditional context.
6155 We expect nothing to be needed here for PARM or TYPENAME.
6156 Pushing a TYPE_DECL at this point for TYPENAME would actually
6157 be incorrect, as we might be in the middle of an expression
6158 with side effects on the pointed-to type size "arguments" prior
6159 to the pointer declaration point and the fake TYPE_DECL in the
6160 enclosing context would force the size evaluation prior to the
6163 if (!TYPE_NAME (type
)
6164 && (decl_context
== NORMAL
|| decl_context
== FIELD
)
6165 && variably_modified_type_p (type
, NULL_TREE
))
6167 tree decl
= build_decl (loc
, TYPE_DECL
, NULL_TREE
, type
);
6168 DECL_ARTIFICIAL (decl
) = 1;
6170 finish_decl (decl
, loc
, NULL_TREE
, NULL_TREE
, NULL_TREE
);
6171 TYPE_NAME (type
) = decl
;
6174 type
= c_build_pointer_type (type
);
6176 /* Process type qualifiers (such as const or volatile)
6177 that were given inside the `*'. */
6178 type_quals
= declarator
->u
.pointer_quals
;
6180 declarator
= declarator
->declarator
;
6187 *decl_attrs
= chainon (returned_attrs
, *decl_attrs
);
6189 /* Now TYPE has the actual type, apart from any qualifiers in
6192 /* Warn about address space used for things other than static memory or
6194 address_space
= DECODE_QUAL_ADDR_SPACE (type_quals
);
6195 if (!ADDR_SPACE_GENERIC_P (address_space
))
6197 if (decl_context
== NORMAL
)
6199 switch (storage_class
)
6202 error ("%qs combined with %<auto%> qualifier for %qE",
6203 c_addr_space_name (address_space
), name
);
6206 error ("%qs combined with %<register%> qualifier for %qE",
6207 c_addr_space_name (address_space
), name
);
6210 if (current_function_scope
)
6212 error ("%qs specified for auto variable %qE",
6213 c_addr_space_name (address_space
), name
);
6225 else if (decl_context
== PARM
&& TREE_CODE (type
) != ARRAY_TYPE
)
6228 error ("%qs specified for parameter %qE",
6229 c_addr_space_name (address_space
), name
);
6231 error ("%qs specified for unnamed parameter",
6232 c_addr_space_name (address_space
));
6234 else if (decl_context
== FIELD
)
6237 error ("%qs specified for structure field %qE",
6238 c_addr_space_name (address_space
), name
);
6240 error ("%qs specified for structure field",
6241 c_addr_space_name (address_space
));
6245 /* Check the type and width of a bit-field. */
6248 check_bitfield_type_and_width (&type
, width
, name
);
6249 /* C11 makes it implementation-defined (6.7.2.1#5) whether
6250 atomic types are permitted for bit-fields; we have no code to
6251 make bit-field accesses atomic, so disallow them. */
6252 if (type_quals
& TYPE_QUAL_ATOMIC
)
6255 error ("bit-field %qE has atomic type", name
);
6257 error ("bit-field has atomic type");
6258 type_quals
&= ~TYPE_QUAL_ATOMIC
;
6262 /* Reject invalid uses of _Alignas. */
6263 if (declspecs
->alignas_p
)
6265 if (storage_class
== csc_typedef
)
6266 error_at (loc
, "alignment specified for typedef %qE", name
);
6267 else if (storage_class
== csc_register
)
6268 error_at (loc
, "alignment specified for %<register%> object %qE",
6270 else if (decl_context
== PARM
)
6273 error_at (loc
, "alignment specified for parameter %qE", name
);
6275 error_at (loc
, "alignment specified for unnamed parameter");
6280 error_at (loc
, "alignment specified for bit-field %qE", name
);
6282 error_at (loc
, "alignment specified for unnamed bit-field");
6284 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
6285 error_at (loc
, "alignment specified for function %qE", name
);
6286 else if (declspecs
->align_log
!= -1)
6288 alignas_align
= 1U << declspecs
->align_log
;
6289 if (alignas_align
< min_align_of_type (type
))
6292 error_at (loc
, "%<_Alignas%> specifiers cannot reduce "
6293 "alignment of %qE", name
);
6295 error_at (loc
, "%<_Alignas%> specifiers cannot reduce "
6296 "alignment of unnamed field");
6302 /* Did array size calculations overflow or does the array cover more
6303 than half of the address-space? */
6304 if (TREE_CODE (type
) == ARRAY_TYPE
6305 && COMPLETE_TYPE_P (type
)
6306 && TREE_CODE (TYPE_SIZE_UNIT (type
)) == INTEGER_CST
6307 && ! valid_constant_size_p (TYPE_SIZE_UNIT (type
)))
6310 error_at (loc
, "size of array %qE is too large", name
);
6312 error_at (loc
, "size of unnamed array is too large");
6313 /* If we proceed with the array type as it is, we'll eventually
6314 crash in tree_to_[su]hwi(). */
6315 type
= error_mark_node
;
6318 /* If this is declaring a typedef name, return a TYPE_DECL. */
6320 if (storage_class
== csc_typedef
)
6323 if ((type_quals
& TYPE_QUAL_ATOMIC
)
6324 && TREE_CODE (type
) == FUNCTION_TYPE
)
6327 "%<_Atomic%>-qualified function type");
6328 type_quals
&= ~TYPE_QUAL_ATOMIC
;
6330 else if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
6332 pedwarn (loc
, OPT_Wpedantic
,
6333 "ISO C forbids qualified function types");
6335 type
= c_build_qualified_type (type
, type_quals
);
6336 decl
= build_decl (declarator
->id_loc
,
6337 TYPE_DECL
, declarator
->u
.id
, type
);
6338 if (declspecs
->explicit_signed_p
)
6339 C_TYPEDEF_EXPLICITLY_SIGNED (decl
) = 1;
6340 if (declspecs
->inline_p
)
6341 pedwarn (loc
, 0,"typedef %q+D declared %<inline%>", decl
);
6342 if (declspecs
->noreturn_p
)
6343 pedwarn (loc
, 0,"typedef %q+D declared %<_Noreturn%>", decl
);
6345 if (warn_cxx_compat
&& declarator
->u
.id
!= NULL_TREE
)
6347 struct c_binding
*b
= I_TAG_BINDING (declarator
->u
.id
);
6350 && b
->decl
!= NULL_TREE
6351 && (B_IN_CURRENT_SCOPE (b
)
6352 || (current_scope
== file_scope
&& B_IN_EXTERNAL_SCOPE (b
)))
6353 && TYPE_MAIN_VARIANT (b
->decl
) != TYPE_MAIN_VARIANT (type
))
6355 warning_at (declarator
->id_loc
, OPT_Wc___compat
,
6356 ("using %qD as both a typedef and a tag is "
6359 if (b
->locus
!= UNKNOWN_LOCATION
)
6360 inform (b
->locus
, "originally defined here");
6367 /* If this is a type name (such as, in a cast or sizeof),
6368 compute the type and return it now. */
6370 if (decl_context
== TYPENAME
)
6372 /* Note that the grammar rejects storage classes in typenames
6374 gcc_assert (storage_class
== csc_none
&& !threadp
6375 && !declspecs
->inline_p
&& !declspecs
->noreturn_p
);
6376 if ((type_quals
& TYPE_QUAL_ATOMIC
)
6377 && TREE_CODE (type
) == FUNCTION_TYPE
)
6380 "%<_Atomic%>-qualified function type");
6381 type_quals
&= ~TYPE_QUAL_ATOMIC
;
6383 else if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
6385 pedwarn (loc
, OPT_Wpedantic
,
6386 "ISO C forbids const or volatile function types");
6388 type
= c_build_qualified_type (type
, type_quals
);
6392 if (pedantic
&& decl_context
== FIELD
6393 && variably_modified_type_p (type
, NULL_TREE
))
6396 pedwarn (loc
, OPT_Wpedantic
, "a member of a structure or union cannot "
6397 "have a variably modified type");
6400 /* Aside from typedefs and type names (handle above),
6401 `void' at top level (not within pointer)
6402 is allowed only in public variables.
6403 We don't complain about parms either, but that is because
6404 a better error message can be made later. */
6406 if (VOID_TYPE_P (type
) && decl_context
!= PARM
6407 && !((decl_context
!= FIELD
&& TREE_CODE (type
) != FUNCTION_TYPE
)
6408 && (storage_class
== csc_extern
6409 || (current_scope
== file_scope
6410 && !(storage_class
== csc_static
6411 || storage_class
== csc_register
)))))
6413 error_at (loc
, "variable or field %qE declared void", name
);
6414 type
= integer_type_node
;
6417 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
6418 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
6423 if (decl_context
== PARM
)
6426 bool array_parameter_p
= false;
6428 /* A parameter declared as an array of T is really a pointer to T.
6429 One declared as a function is really a pointer to a function. */
6431 if (TREE_CODE (type
) == ARRAY_TYPE
)
6433 /* Transfer const-ness of array into that of type pointed to. */
6434 type
= TREE_TYPE (type
);
6436 type
= c_build_qualified_type (type
, type_quals
);
6437 type
= c_build_pointer_type (type
);
6438 type_quals
= array_ptr_quals
;
6440 type
= c_build_qualified_type (type
, type_quals
);
6442 /* We don't yet implement attributes in this context. */
6443 if (array_ptr_attrs
!= NULL_TREE
)
6444 warning_at (loc
, OPT_Wattributes
,
6445 "attributes in parameter array declarator ignored");
6447 size_varies
= false;
6448 array_parameter_p
= true;
6450 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
6452 if (type_quals
& TYPE_QUAL_ATOMIC
)
6455 "%<_Atomic%>-qualified function type");
6456 type_quals
&= ~TYPE_QUAL_ATOMIC
;
6458 else if (type_quals
)
6459 pedwarn (loc
, OPT_Wpedantic
,
6460 "ISO C forbids qualified function types");
6462 type
= c_build_qualified_type (type
, type_quals
);
6463 type
= c_build_pointer_type (type
);
6464 type_quals
= TYPE_UNQUALIFIED
;
6466 else if (type_quals
)
6467 type
= c_build_qualified_type (type
, type_quals
);
6469 decl
= build_decl (declarator
->id_loc
,
6470 PARM_DECL
, declarator
->u
.id
, type
);
6472 C_DECL_VARIABLE_SIZE (decl
) = 1;
6473 C_ARRAY_PARAMETER (decl
) = array_parameter_p
;
6475 /* Compute the type actually passed in the parmlist,
6476 for the case where there is no prototype.
6477 (For example, shorts and chars are passed as ints.)
6478 When there is a prototype, this is overridden later. */
6480 if (type
== error_mark_node
)
6481 promoted_type
= type
;
6483 promoted_type
= c_type_promotes_to (type
);
6485 DECL_ARG_TYPE (decl
) = promoted_type
;
6486 if (declspecs
->inline_p
)
6487 pedwarn (loc
, 0, "parameter %q+D declared %<inline%>", decl
);
6488 if (declspecs
->noreturn_p
)
6489 pedwarn (loc
, 0, "parameter %q+D declared %<_Noreturn%>", decl
);
6491 else if (decl_context
== FIELD
)
6493 /* Note that the grammar rejects storage classes in typenames
6495 gcc_assert (storage_class
== csc_none
&& !threadp
6496 && !declspecs
->inline_p
&& !declspecs
->noreturn_p
);
6498 /* Structure field. It may not be a function. */
6500 if (TREE_CODE (type
) == FUNCTION_TYPE
)
6502 error_at (loc
, "field %qE declared as a function", name
);
6503 type
= build_pointer_type (type
);
6505 else if (TREE_CODE (type
) != ERROR_MARK
6506 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type
))
6509 error_at (loc
, "field %qE has incomplete type", name
);
6511 error_at (loc
, "unnamed field has incomplete type");
6512 type
= error_mark_node
;
6514 else if (TREE_CODE (type
) == ARRAY_TYPE
6515 && TYPE_DOMAIN (type
) == NULL_TREE
)
6517 /* We have a flexible array member through a typedef.
6518 Set suitable range. Whether this is a correct position
6519 for a flexible array member will be determined elsewhere. */
6520 if (!in_system_header_at (input_location
))
6521 pedwarn_c90 (loc
, OPT_Wpedantic
, "ISO C90 does not "
6522 "support flexible array members");
6523 type
= build_distinct_type_copy (TYPE_MAIN_VARIANT (type
));
6524 TYPE_DOMAIN (type
) = build_range_type (sizetype
, size_zero_node
,
6527 type
= c_build_qualified_type (type
, type_quals
);
6528 decl
= build_decl (declarator
->id_loc
,
6529 FIELD_DECL
, declarator
->u
.id
, type
);
6530 DECL_NONADDRESSABLE_P (decl
) = bitfield
;
6531 if (bitfield
&& !declarator
->u
.id
)
6532 TREE_NO_WARNING (decl
) = 1;
6535 C_DECL_VARIABLE_SIZE (decl
) = 1;
6537 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
6539 if (storage_class
== csc_register
|| threadp
)
6541 error_at (loc
, "invalid storage class for function %qE", name
);
6543 else if (current_scope
!= file_scope
)
6545 /* Function declaration not at file scope. Storage
6546 classes other than `extern' are not allowed, C99
6547 6.7.1p5, and `extern' makes no difference. However,
6548 GCC allows 'auto', perhaps with 'inline', to support
6549 nested functions. */
6550 if (storage_class
== csc_auto
)
6551 pedwarn (loc
, OPT_Wpedantic
,
6552 "invalid storage class for function %qE", name
);
6553 else if (storage_class
== csc_static
)
6555 error_at (loc
, "invalid storage class for function %qE", name
);
6557 storage_class
= declspecs
->storage_class
= csc_none
;
6563 decl
= build_decl (declarator
->id_loc
,
6564 FUNCTION_DECL
, declarator
->u
.id
, type
);
6565 decl
= build_decl_attribute_variant (decl
, decl_attr
);
6567 if (type_quals
& TYPE_QUAL_ATOMIC
)
6570 "%<_Atomic%>-qualified function type");
6571 type_quals
&= ~TYPE_QUAL_ATOMIC
;
6573 else if (pedantic
&& type_quals
&& !DECL_IN_SYSTEM_HEADER (decl
))
6574 pedwarn (loc
, OPT_Wpedantic
,
6575 "ISO C forbids qualified function types");
6577 /* Every function declaration is an external reference
6578 (DECL_EXTERNAL) except for those which are not at file
6579 scope and are explicitly declared "auto". This is
6580 forbidden by standard C (C99 6.7.1p5) and is interpreted by
6581 GCC to signify a forward declaration of a nested function. */
6582 if (storage_class
== csc_auto
&& current_scope
!= file_scope
)
6583 DECL_EXTERNAL (decl
) = 0;
6584 /* In C99, a function which is declared 'inline' with 'extern'
6585 is not an external reference (which is confusing). It
6586 means that the later definition of the function must be output
6587 in this file, C99 6.7.4p6. In GNU C89, a function declared
6588 'extern inline' is an external reference. */
6589 else if (declspecs
->inline_p
&& storage_class
!= csc_static
)
6590 DECL_EXTERNAL (decl
) = ((storage_class
== csc_extern
)
6591 == flag_gnu89_inline
);
6593 DECL_EXTERNAL (decl
) = !initialized
;
6595 /* Record absence of global scope for `static' or `auto'. */
6597 = !(storage_class
== csc_static
|| storage_class
== csc_auto
);
6599 /* For a function definition, record the argument information
6600 block where store_parm_decls will look for it. */
6602 current_function_arg_info
= arg_info
;
6604 if (declspecs
->default_int_p
)
6605 C_FUNCTION_IMPLICIT_INT (decl
) = 1;
6607 /* Record presence of `inline' and `_Noreturn', if it is
6609 if (flag_hosted
&& MAIN_NAME_P (declarator
->u
.id
))
6611 if (declspecs
->inline_p
)
6612 pedwarn (loc
, 0, "cannot inline function %<main%>");
6613 if (declspecs
->noreturn_p
)
6614 pedwarn (loc
, 0, "%<main%> declared %<_Noreturn%>");
6618 if (declspecs
->inline_p
)
6619 /* Record that the function is declared `inline'. */
6620 DECL_DECLARED_INLINE_P (decl
) = 1;
6621 if (declspecs
->noreturn_p
)
6624 pedwarn_c99 (loc
, OPT_Wpedantic
,
6625 "ISO C99 does not support %<_Noreturn%>");
6627 pedwarn_c99 (loc
, OPT_Wpedantic
,
6628 "ISO C90 does not support %<_Noreturn%>");
6629 TREE_THIS_VOLATILE (decl
) = 1;
6635 /* It's a variable. */
6636 /* An uninitialized decl with `extern' is a reference. */
6637 int extern_ref
= !initialized
&& storage_class
== csc_extern
;
6639 type
= c_build_qualified_type (type
, type_quals
);
6641 /* C99 6.2.2p7: It is invalid (compile-time undefined
6642 behavior) to create an 'extern' declaration for a
6643 variable if there is a global declaration that is
6644 'static' and the global declaration is not visible.
6645 (If the static declaration _is_ currently visible,
6646 the 'extern' declaration is taken to refer to that decl.) */
6647 if (extern_ref
&& current_scope
!= file_scope
)
6649 tree global_decl
= identifier_global_value (declarator
->u
.id
);
6650 tree visible_decl
= lookup_name (declarator
->u
.id
);
6653 && global_decl
!= visible_decl
6654 && TREE_CODE (global_decl
) == VAR_DECL
6655 && !TREE_PUBLIC (global_decl
))
6656 error_at (loc
, "variable previously declared %<static%> "
6657 "redeclared %<extern%>");
6660 decl
= build_decl (declarator
->id_loc
,
6661 VAR_DECL
, declarator
->u
.id
, type
);
6663 C_DECL_VARIABLE_SIZE (decl
) = 1;
6665 if (declspecs
->inline_p
)
6666 pedwarn (loc
, 0, "variable %q+D declared %<inline%>", decl
);
6667 if (declspecs
->noreturn_p
)
6668 pedwarn (loc
, 0, "variable %q+D declared %<_Noreturn%>", decl
);
6670 /* At file scope, an initialized extern declaration may follow
6671 a static declaration. In that case, DECL_EXTERNAL will be
6672 reset later in start_decl. */
6673 DECL_EXTERNAL (decl
) = (storage_class
== csc_extern
);
6675 /* At file scope, the presence of a `static' or `register' storage
6676 class specifier, or the absence of all storage class specifiers
6677 makes this declaration a definition (perhaps tentative). Also,
6678 the absence of `static' makes it public. */
6679 if (current_scope
== file_scope
)
6681 TREE_PUBLIC (decl
) = storage_class
!= csc_static
;
6682 TREE_STATIC (decl
) = !extern_ref
;
6684 /* Not at file scope, only `static' makes a static definition. */
6687 TREE_STATIC (decl
) = (storage_class
== csc_static
);
6688 TREE_PUBLIC (decl
) = extern_ref
;
6692 set_decl_tls_model (decl
, decl_default_tls_model (decl
));
6695 if ((storage_class
== csc_extern
6696 || (storage_class
== csc_none
6697 && TREE_CODE (type
) == FUNCTION_TYPE
6699 && variably_modified_type_p (type
, NULL_TREE
))
6702 if (TREE_CODE (type
) == FUNCTION_TYPE
)
6703 error_at (loc
, "non-nested function with variably modified type");
6705 error_at (loc
, "object with variably modified type must have "
6709 /* Record `register' declaration for warnings on &
6710 and in case doing stupid register allocation. */
6712 if (storage_class
== csc_register
)
6714 C_DECL_REGISTER (decl
) = 1;
6715 DECL_REGISTER (decl
) = 1;
6718 /* Record constancy and volatility. */
6719 c_apply_type_quals_to_decl (type_quals
, decl
);
6721 /* Apply _Alignas specifiers. */
6724 DECL_ALIGN (decl
) = alignas_align
* BITS_PER_UNIT
;
6725 DECL_USER_ALIGN (decl
) = 1;
6728 /* If a type has volatile components, it should be stored in memory.
6729 Otherwise, the fact that those components are volatile
6730 will be ignored, and would even crash the compiler.
6731 Of course, this only makes sense on VAR,PARM, and RESULT decl's. */
6732 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl
))
6733 && (TREE_CODE (decl
) == VAR_DECL
|| TREE_CODE (decl
) == PARM_DECL
6734 || TREE_CODE (decl
) == RESULT_DECL
))
6736 /* It is not an error for a structure with volatile fields to
6737 be declared register, but reset DECL_REGISTER since it
6738 cannot actually go in a register. */
6739 int was_reg
= C_DECL_REGISTER (decl
);
6740 C_DECL_REGISTER (decl
) = 0;
6741 DECL_REGISTER (decl
) = 0;
6742 c_mark_addressable (decl
);
6743 C_DECL_REGISTER (decl
) = was_reg
;
6746 /* This is the earliest point at which we might know the assembler
6747 name of a variable. Thus, if it's known before this, die horribly. */
6748 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl
));
6751 && TREE_CODE (decl
) == VAR_DECL
6752 && TREE_PUBLIC (decl
)
6753 && TREE_STATIC (decl
)
6754 && (TREE_CODE (TREE_TYPE (decl
)) == RECORD_TYPE
6755 || TREE_CODE (TREE_TYPE (decl
)) == UNION_TYPE
6756 || TREE_CODE (TREE_TYPE (decl
)) == ENUMERAL_TYPE
)
6757 && TYPE_NAME (TREE_TYPE (decl
)) == NULL_TREE
)
6758 warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wc___compat
,
6759 ("non-local variable %qD with anonymous type is "
6760 "questionable in C++"),
6767 /* Decode the parameter-list info for a function type or function definition.
6768 The argument is the value returned by `get_parm_info' (or made in c-parse.c
6769 if there is an identifier list instead of a parameter decl list).
6770 These two functions are separate because when a function returns
6771 or receives functions then each is called multiple times but the order
6772 of calls is different. The last call to `grokparms' is always the one
6773 that contains the formal parameter names of a function definition.
6775 Return a list of arg types to use in the FUNCTION_TYPE for this function.
6777 FUNCDEF_FLAG is true for a function definition, false for
6778 a mere declaration. A nonempty identifier-list gets an error message
6779 when FUNCDEF_FLAG is false. */
6782 grokparms (struct c_arg_info
*arg_info
, bool funcdef_flag
)
6784 tree arg_types
= arg_info
->types
;
6786 if (funcdef_flag
&& arg_info
->had_vla_unspec
)
6788 /* A function definition isn't function prototype scope C99 6.2.1p4. */
6790 error ("%<[*]%> not allowed in other than function prototype scope");
6793 if (arg_types
== 0 && !funcdef_flag
6794 && !in_system_header_at (input_location
))
6795 warning (OPT_Wstrict_prototypes
,
6796 "function declaration isn%'t a prototype");
6798 if (arg_types
== error_mark_node
)
6799 return 0; /* don't set TYPE_ARG_TYPES in this case */
6801 else if (arg_types
&& TREE_CODE (TREE_VALUE (arg_types
)) == IDENTIFIER_NODE
)
6805 pedwarn (input_location
, 0, "parameter names (without types) in function declaration");
6806 arg_info
->parms
= NULL_TREE
;
6809 arg_info
->parms
= arg_info
->types
;
6811 arg_info
->types
= 0;
6816 tree parm
, type
, typelt
;
6817 unsigned int parmno
;
6820 /* If there is a parameter of incomplete type in a definition,
6821 this is an error. In a declaration this is valid, and a
6822 struct or union type may be completed later, before any calls
6823 or definition of the function. In the case where the tag was
6824 first declared within the parameter list, a warning has
6825 already been given. If a parameter has void type, then
6826 however the function cannot be defined or called, so
6829 for (parm
= arg_info
->parms
, typelt
= arg_types
, parmno
= 1;
6831 parm
= DECL_CHAIN (parm
), typelt
= TREE_CHAIN (typelt
), parmno
++)
6833 type
= TREE_VALUE (typelt
);
6834 if (type
== error_mark_node
)
6837 if (!COMPLETE_TYPE_P (type
))
6841 if (DECL_NAME (parm
))
6842 error_at (input_location
,
6843 "parameter %u (%q+D) has incomplete type",
6846 error_at (DECL_SOURCE_LOCATION (parm
),
6847 "parameter %u has incomplete type",
6850 TREE_VALUE (typelt
) = error_mark_node
;
6851 TREE_TYPE (parm
) = error_mark_node
;
6852 arg_types
= NULL_TREE
;
6854 else if (VOID_TYPE_P (type
))
6856 if (DECL_NAME (parm
))
6857 warning_at (input_location
, 0,
6858 "parameter %u (%q+D) has void type",
6861 warning_at (DECL_SOURCE_LOCATION (parm
), 0,
6862 "parameter %u has void type",
6867 errmsg
= targetm
.invalid_parameter_type (type
);
6871 TREE_VALUE (typelt
) = error_mark_node
;
6872 TREE_TYPE (parm
) = error_mark_node
;
6873 arg_types
= NULL_TREE
;
6876 if (DECL_NAME (parm
) && TREE_USED (parm
))
6877 warn_if_shadowing (parm
);
6883 /* Allocate and initialize a c_arg_info structure from the parser's
6887 build_arg_info (void)
6889 struct c_arg_info
*ret
= XOBNEW (&parser_obstack
, struct c_arg_info
);
6890 ret
->parms
= NULL_TREE
;
6892 ret
->types
= NULL_TREE
;
6893 ret
->others
= NULL_TREE
;
6894 ret
->pending_sizes
= NULL
;
6895 ret
->had_vla_unspec
= 0;
6899 /* Take apart the current scope and return a c_arg_info structure with
6900 info on a parameter list just parsed.
6902 This structure is later fed to 'grokparms' and 'store_parm_decls'.
6904 ELLIPSIS being true means the argument list ended in '...' so don't
6905 append a sentinel (void_list_node) to the end of the type-list.
6907 EXPR is NULL or an expression that needs to be evaluated for the
6908 side effects of array size expressions in the parameters. */
6911 get_parm_info (bool ellipsis
, tree expr
)
6913 struct c_binding
*b
= current_scope
->bindings
;
6914 struct c_arg_info
*arg_info
= build_arg_info ();
6917 vec
<c_arg_tag
, va_gc
> *tags
= NULL
;
6921 static bool explained_incomplete_types
= false;
6922 bool gave_void_only_once_err
= false;
6924 arg_info
->had_vla_unspec
= current_scope
->had_vla_unspec
;
6926 /* The bindings in this scope must not get put into a block.
6927 We will take care of deleting the binding nodes. */
6928 current_scope
->bindings
= 0;
6930 /* This function is only called if there was *something* on the
6934 /* A parameter list consisting solely of 'void' indicates that the
6935 function takes no arguments. But if the 'void' is qualified
6936 (by 'const' or 'volatile'), or has a storage class specifier
6937 ('register'), then the behavior is undefined; issue an error.
6938 Typedefs for 'void' are OK (see DR#157). */
6939 if (b
->prev
== 0 /* one binding */
6940 && TREE_CODE (b
->decl
) == PARM_DECL
/* which is a parameter */
6941 && !DECL_NAME (b
->decl
) /* anonymous */
6942 && VOID_TYPE_P (TREE_TYPE (b
->decl
))) /* of void type */
6944 if (TYPE_QUALS (TREE_TYPE (b
->decl
)) != TYPE_UNQUALIFIED
6945 || C_DECL_REGISTER (b
->decl
))
6946 error ("%<void%> as only parameter may not be qualified");
6948 /* There cannot be an ellipsis. */
6950 error ("%<void%> must be the only parameter");
6952 arg_info
->types
= void_list_node
;
6957 types
= void_list_node
;
6959 /* Break up the bindings list into parms, tags, types, and others;
6960 apply sanity checks; purge the name-to-decl bindings. */
6963 tree decl
= b
->decl
;
6964 tree type
= TREE_TYPE (decl
);
6966 const char *keyword
;
6968 switch (TREE_CODE (decl
))
6973 gcc_assert (I_SYMBOL_BINDING (b
->id
) == b
);
6974 I_SYMBOL_BINDING (b
->id
) = b
->shadowed
;
6977 /* Check for forward decls that never got their actual decl. */
6978 if (TREE_ASM_WRITTEN (decl
))
6979 error ("parameter %q+D has just a forward declaration", decl
);
6980 /* Check for (..., void, ...) and issue an error. */
6981 else if (VOID_TYPE_P (type
) && !DECL_NAME (decl
))
6983 if (!gave_void_only_once_err
)
6985 error ("%<void%> must be the only parameter");
6986 gave_void_only_once_err
= true;
6991 /* Valid parameter, add it to the list. */
6992 DECL_CHAIN (decl
) = parms
;
6995 /* Since there is a prototype, args are passed in their
6996 declared types. The back end may override this later. */
6997 DECL_ARG_TYPE (decl
) = type
;
6998 types
= tree_cons (0, type
, types
);
7002 case ENUMERAL_TYPE
: keyword
= "enum"; goto tag
;
7003 case UNION_TYPE
: keyword
= "union"; goto tag
;
7004 case RECORD_TYPE
: keyword
= "struct"; goto tag
;
7006 /* Types may not have tag-names, in which case the type
7007 appears in the bindings list with b->id NULL. */
7010 gcc_assert (I_TAG_BINDING (b
->id
) == b
);
7011 I_TAG_BINDING (b
->id
) = b
->shadowed
;
7014 /* Warn about any struct, union or enum tags defined in a
7015 parameter list. The scope of such types is limited to
7016 the parameter list, which is rarely if ever desirable
7017 (it's impossible to call such a function with type-
7018 correct arguments). An anonymous union parm type is
7019 meaningful as a GNU extension, so don't warn for that. */
7020 if (TREE_CODE (decl
) != UNION_TYPE
|| b
->id
!= 0)
7023 /* The %s will be one of 'struct', 'union', or 'enum'. */
7024 warning (0, "%<%s %E%> declared inside parameter list",
7027 /* The %s will be one of 'struct', 'union', or 'enum'. */
7028 warning (0, "anonymous %s declared inside parameter list",
7031 if (!explained_incomplete_types
)
7033 warning (0, "its scope is only this definition or declaration,"
7034 " which is probably not what you want");
7035 explained_incomplete_types
= true;
7041 vec_safe_push (tags
, tag
);
7047 /* CONST_DECLs appear here when we have an embedded enum,
7048 and TYPE_DECLs appear here when we have an embedded struct
7049 or union. No warnings for this - we already warned about the
7050 type itself. FUNCTION_DECLs appear when there is an implicit
7051 function declaration in the parameter list. */
7053 /* When we reinsert this decl in the function body, we need
7054 to reconstruct whether it was marked as nested. */
7055 gcc_assert (TREE_CODE (decl
) == FUNCTION_DECL
7058 DECL_CHAIN (decl
) = others
;
7063 /* error_mark_node appears here when we have an undeclared
7064 variable. Just throw it away. */
7067 gcc_assert (I_SYMBOL_BINDING (b
->id
) == b
);
7068 I_SYMBOL_BINDING (b
->id
) = b
->shadowed
;
7072 /* Other things that might be encountered. */
7079 b
= free_binding_and_advance (b
);
7082 arg_info
->parms
= parms
;
7083 arg_info
->tags
= tags
;
7084 arg_info
->types
= types
;
7085 arg_info
->others
= others
;
7086 arg_info
->pending_sizes
= expr
;
7090 /* Get the struct, enum or union (CODE says which) with tag NAME.
7091 Define the tag as a forward-reference with location LOC if it is
7092 not defined. Return a c_typespec structure for the type
7096 parser_xref_tag (location_t loc
, enum tree_code code
, tree name
)
7098 struct c_typespec ret
;
7102 ret
.expr
= NULL_TREE
;
7103 ret
.expr_const_operands
= true;
7105 /* If a cross reference is requested, look up the type
7106 already defined for this tag and return it. */
7108 ref
= lookup_tag (code
, name
, 0, &refloc
);
7109 /* If this is the right type of tag, return what we found.
7110 (This reference will be shadowed by shadow_tag later if appropriate.)
7111 If this is the wrong type of tag, do not return it. If it was the
7112 wrong type in the same scope, we will have had an error
7113 message already; if in a different scope and declaring
7114 a name, pending_xref_error will give an error message; but if in a
7115 different scope and not declaring a name, this tag should
7116 shadow the previous declaration of a different type of tag, and
7117 this would not work properly if we return the reference found.
7118 (For example, with "struct foo" in an outer scope, "union foo;"
7119 must shadow that tag with a new one of union type.) */
7120 ret
.kind
= (ref
? ctsk_tagref
: ctsk_tagfirstref
);
7121 if (ref
&& TREE_CODE (ref
) == code
)
7123 if (C_TYPE_DEFINED_IN_STRUCT (ref
)
7124 && loc
!= UNKNOWN_LOCATION
7130 warning_at (loc
, OPT_Wc___compat
,
7131 ("enum type defined in struct or union "
7132 "is not visible in C++"));
7133 inform (refloc
, "enum type defined here");
7136 warning_at (loc
, OPT_Wc___compat
,
7137 ("struct defined in struct or union "
7138 "is not visible in C++"));
7139 inform (refloc
, "struct defined here");
7142 warning_at (loc
, OPT_Wc___compat
,
7143 ("union defined in struct or union "
7144 "is not visible in C++"));
7145 inform (refloc
, "union defined here");
7156 /* If no such tag is yet defined, create a forward-reference node
7157 and record it as the "definition".
7158 When a real declaration of this type is found,
7159 the forward-reference will be altered into a real type. */
7161 ref
= make_node (code
);
7162 if (code
== ENUMERAL_TYPE
)
7164 /* Give the type a default layout like unsigned int
7165 to avoid crashing if it does not get defined. */
7166 SET_TYPE_MODE (ref
, TYPE_MODE (unsigned_type_node
));
7167 TYPE_ALIGN (ref
) = TYPE_ALIGN (unsigned_type_node
);
7168 TYPE_USER_ALIGN (ref
) = 0;
7169 TYPE_UNSIGNED (ref
) = 1;
7170 TYPE_PRECISION (ref
) = TYPE_PRECISION (unsigned_type_node
);
7171 TYPE_MIN_VALUE (ref
) = TYPE_MIN_VALUE (unsigned_type_node
);
7172 TYPE_MAX_VALUE (ref
) = TYPE_MAX_VALUE (unsigned_type_node
);
7175 pushtag (loc
, name
, ref
);
7181 /* Get the struct, enum or union (CODE says which) with tag NAME.
7182 Define the tag as a forward-reference if it is not defined.
7183 Return a tree for the type. */
7186 xref_tag (enum tree_code code
, tree name
)
7188 return parser_xref_tag (input_location
, code
, name
).spec
;
7191 /* Make sure that the tag NAME is defined *in the current scope*
7192 at least as a forward reference.
7193 LOC is the location of the struct's definition.
7194 CODE says which kind of tag NAME ought to be.
7196 This stores the current value of the file static STRUCT_PARSE_INFO
7197 in *ENCLOSING_STRUCT_PARSE_INFO, and points STRUCT_PARSE_INFO at a
7198 new c_struct_parse_info structure. The old value of
7199 STRUCT_PARSE_INFO is restored in finish_struct. */
7202 start_struct (location_t loc
, enum tree_code code
, tree name
,
7203 struct c_struct_parse_info
**enclosing_struct_parse_info
)
7205 /* If there is already a tag defined at this scope
7206 (as a forward reference), just return it. */
7208 tree ref
= NULL_TREE
;
7209 location_t refloc
= UNKNOWN_LOCATION
;
7211 if (name
!= NULL_TREE
)
7212 ref
= lookup_tag (code
, name
, 1, &refloc
);
7213 if (ref
&& TREE_CODE (ref
) == code
)
7215 if (TYPE_SIZE (ref
))
7217 if (code
== UNION_TYPE
)
7218 error_at (loc
, "redefinition of %<union %E%>", name
);
7220 error_at (loc
, "redefinition of %<struct %E%>", name
);
7221 if (refloc
!= UNKNOWN_LOCATION
)
7222 inform (refloc
, "originally defined here");
7223 /* Don't create structures using a name already in use. */
7226 else if (C_TYPE_BEING_DEFINED (ref
))
7228 if (code
== UNION_TYPE
)
7229 error_at (loc
, "nested redefinition of %<union %E%>", name
);
7231 error_at (loc
, "nested redefinition of %<struct %E%>", name
);
7232 /* Don't bother to report "originally defined here" for a
7233 nested redefinition; the original definition should be
7235 /* Don't create structures that contain themselves. */
7240 /* Otherwise create a forward-reference just so the tag is in scope. */
7242 if (ref
== NULL_TREE
|| TREE_CODE (ref
) != code
)
7244 ref
= make_node (code
);
7245 pushtag (loc
, name
, ref
);
7248 C_TYPE_BEING_DEFINED (ref
) = 1;
7249 TYPE_PACKED (ref
) = flag_pack_struct
;
7251 *enclosing_struct_parse_info
= struct_parse_info
;
7252 struct_parse_info
= XNEW (struct c_struct_parse_info
);
7253 struct_parse_info
->struct_types
.create (0);
7254 struct_parse_info
->fields
.create (0);
7255 struct_parse_info
->typedefs_seen
.create (0);
7257 /* FIXME: This will issue a warning for a use of a type defined
7258 within a statement expr used within sizeof, et. al. This is not
7259 terribly serious as C++ doesn't permit statement exprs within
7261 if (warn_cxx_compat
&& (in_sizeof
|| in_typeof
|| in_alignof
))
7262 warning_at (loc
, OPT_Wc___compat
,
7263 "defining type in %qs expression is invalid in C++",
7266 : (in_typeof
? "typeof" : "alignof")));
7271 /* Process the specs, declarator and width (NULL if omitted)
7272 of a structure component, returning a FIELD_DECL node.
7273 WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node.
7274 DECL_ATTRS is as for grokdeclarator.
7276 LOC is the location of the structure component.
7278 This is done during the parsing of the struct declaration.
7279 The FIELD_DECL nodes are chained together and the lot of them
7280 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
7283 grokfield (location_t loc
,
7284 struct c_declarator
*declarator
, struct c_declspecs
*declspecs
,
7285 tree width
, tree
*decl_attrs
)
7289 if (declarator
->kind
== cdk_id
&& declarator
->u
.id
== NULL_TREE
7290 && width
== NULL_TREE
)
7292 /* This is an unnamed decl.
7294 If we have something of the form "union { list } ;" then this
7295 is the anonymous union extension. Similarly for struct.
7297 If this is something of the form "struct foo;", then
7298 If MS or Plan 9 extensions are enabled, this is handled as
7299 an anonymous struct.
7300 Otherwise this is a forward declaration of a structure tag.
7302 If this is something of the form "foo;" and foo is a TYPE_DECL, then
7303 If foo names a structure or union without a tag, then this
7304 is an anonymous struct (this is permitted by C11).
7305 If MS or Plan 9 extensions are enabled and foo names a
7306 structure, then again this is an anonymous struct.
7307 Otherwise this is an error.
7309 Oh what a horrid tangled web we weave. I wonder if MS consciously
7310 took this from Plan 9 or if it was an accident of implementation
7311 that took root before someone noticed the bug... */
7313 tree type
= declspecs
->type
;
7314 bool type_ok
= (TREE_CODE (type
) == RECORD_TYPE
7315 || TREE_CODE (type
) == UNION_TYPE
);
7319 && (flag_ms_extensions
7320 || flag_plan9_extensions
7321 || !declspecs
->typedef_p
))
7323 if (flag_ms_extensions
|| flag_plan9_extensions
)
7325 else if (TYPE_NAME (type
) == NULL
)
7332 pedwarn (loc
, 0, "declaration does not declare anything");
7336 pedwarn_c99 (loc
, OPT_Wpedantic
,
7337 "ISO C99 doesn%'t support unnamed structs/unions");
7339 pedwarn_c99 (loc
, OPT_Wpedantic
,
7340 "ISO C90 doesn%'t support unnamed structs/unions");
7343 value
= grokdeclarator (declarator
, declspecs
, FIELD
, false,
7344 width
? &width
: NULL
, decl_attrs
, NULL
, NULL
,
7347 finish_decl (value
, loc
, NULL_TREE
, NULL_TREE
, NULL_TREE
);
7348 DECL_INITIAL (value
) = width
;
7350 if (warn_cxx_compat
&& DECL_NAME (value
) != NULL_TREE
)
7352 /* If we currently have a binding for this field, set the
7353 in_struct field in the binding, so that we warn about lookups
7355 struct c_binding
*b
= I_SYMBOL_BINDING (DECL_NAME (value
));
7358 /* If the in_struct field is not yet set, push it on a list
7359 to be cleared when this struct is finished. */
7362 struct_parse_info
->fields
.safe_push (b
);
7371 /* Subroutine of detect_field_duplicates: return whether X and Y,
7372 which are both fields in the same struct, have duplicate field
7376 is_duplicate_field (tree x
, tree y
)
7378 if (DECL_NAME (x
) != NULL_TREE
&& DECL_NAME (x
) == DECL_NAME (y
))
7381 /* When using -fplan9-extensions, an anonymous field whose name is a
7382 typedef can duplicate a field name. */
7383 if (flag_plan9_extensions
7384 && (DECL_NAME (x
) == NULL_TREE
|| DECL_NAME (y
) == NULL_TREE
))
7386 tree xt
, xn
, yt
, yn
;
7389 if (DECL_NAME (x
) != NULL_TREE
)
7391 else if ((TREE_CODE (xt
) == RECORD_TYPE
|| TREE_CODE (xt
) == UNION_TYPE
)
7392 && TYPE_NAME (xt
) != NULL_TREE
7393 && TREE_CODE (TYPE_NAME (xt
)) == TYPE_DECL
)
7394 xn
= DECL_NAME (TYPE_NAME (xt
));
7399 if (DECL_NAME (y
) != NULL_TREE
)
7401 else if ((TREE_CODE (yt
) == RECORD_TYPE
|| TREE_CODE (yt
) == UNION_TYPE
)
7402 && TYPE_NAME (yt
) != NULL_TREE
7403 && TREE_CODE (TYPE_NAME (yt
)) == TYPE_DECL
)
7404 yn
= DECL_NAME (TYPE_NAME (yt
));
7408 if (xn
!= NULL_TREE
&& xn
== yn
)
7415 /* Subroutine of detect_field_duplicates: add the fields of FIELDLIST
7416 to HTAB, giving errors for any duplicates. */
7419 detect_field_duplicates_hash (tree fieldlist
,
7420 hash_table
<pointer_hash
<tree_node
> > *htab
)
7425 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
7426 if ((y
= DECL_NAME (x
)) != 0)
7428 slot
= htab
->find_slot (y
, INSERT
);
7431 error ("duplicate member %q+D", x
);
7432 DECL_NAME (x
) = NULL_TREE
;
7436 else if (TREE_CODE (TREE_TYPE (x
)) == RECORD_TYPE
7437 || TREE_CODE (TREE_TYPE (x
)) == UNION_TYPE
)
7439 detect_field_duplicates_hash (TYPE_FIELDS (TREE_TYPE (x
)), htab
);
7441 /* When using -fplan9-extensions, an anonymous field whose
7442 name is a typedef can duplicate a field name. */
7443 if (flag_plan9_extensions
7444 && TYPE_NAME (TREE_TYPE (x
)) != NULL_TREE
7445 && TREE_CODE (TYPE_NAME (TREE_TYPE (x
))) == TYPE_DECL
)
7447 tree xn
= DECL_NAME (TYPE_NAME (TREE_TYPE (x
)));
7448 slot
= htab
->find_slot (xn
, INSERT
);
7450 error ("duplicate member %q+D", TYPE_NAME (TREE_TYPE (x
)));
7456 /* Generate an error for any duplicate field names in FIELDLIST. Munge
7457 the list such that this does not present a problem later. */
7460 detect_field_duplicates (tree fieldlist
)
7465 /* If the struct is the list of instance variables of an Objective-C
7466 class, then we need to check all the instance variables of
7467 superclasses when checking for duplicates (since you can't have
7468 an instance variable in a subclass with the same name as an
7469 instance variable in a superclass). We pass on this job to the
7470 Objective-C compiler. objc_detect_field_duplicates() will return
7471 false if we are not checking the list of instance variables and
7472 the C frontend should proceed with the standard field duplicate
7473 checks. If we are checking the list of instance variables, the
7474 ObjC frontend will do the check, emit the errors if needed, and
7475 then return true. */
7476 if (c_dialect_objc ())
7477 if (objc_detect_field_duplicates (false))
7480 /* First, see if there are more than "a few" fields.
7481 This is trivially true if there are zero or one fields. */
7482 if (!fieldlist
|| !DECL_CHAIN (fieldlist
))
7487 if (DECL_NAME (x
) == NULL_TREE
7488 && (TREE_CODE (TREE_TYPE (x
)) == RECORD_TYPE
7489 || TREE_CODE (TREE_TYPE (x
)) == UNION_TYPE
))
7492 } while (timeout
> 0 && x
);
7494 /* If there were "few" fields and no anonymous structures or unions,
7495 avoid the overhead of allocating a hash table. Instead just do
7496 the nested traversal thing. */
7499 for (x
= DECL_CHAIN (fieldlist
); x
; x
= DECL_CHAIN (x
))
7500 /* When using -fplan9-extensions, we can have duplicates
7501 between typedef names and fields. */
7503 || (flag_plan9_extensions
7504 && DECL_NAME (x
) == NULL_TREE
7505 && (TREE_CODE (TREE_TYPE (x
)) == RECORD_TYPE
7506 || TREE_CODE (TREE_TYPE (x
)) == UNION_TYPE
)
7507 && TYPE_NAME (TREE_TYPE (x
)) != NULL_TREE
7508 && TREE_CODE (TYPE_NAME (TREE_TYPE (x
))) == TYPE_DECL
))
7510 for (y
= fieldlist
; y
!= x
; y
= TREE_CHAIN (y
))
7511 if (is_duplicate_field (y
, x
))
7513 error ("duplicate member %q+D", x
);
7514 DECL_NAME (x
) = NULL_TREE
;
7520 hash_table
<pointer_hash
<tree_node
> > htab (37);
7521 detect_field_duplicates_hash (fieldlist
, &htab
);
7525 /* Finish up struct info used by -Wc++-compat. */
7528 warn_cxx_compat_finish_struct (tree fieldlist
)
7532 struct c_binding
*b
;
7534 /* Set the C_TYPE_DEFINED_IN_STRUCT flag for each type defined in
7535 the current struct. We do this now at the end of the struct
7536 because the flag is used to issue visibility warnings, and we
7537 only want to issue those warnings if the type is referenced
7538 outside of the struct declaration. */
7539 FOR_EACH_VEC_ELT (struct_parse_info
->struct_types
, ix
, x
)
7540 C_TYPE_DEFINED_IN_STRUCT (x
) = 1;
7542 /* The TYPEDEFS_SEEN field of STRUCT_PARSE_INFO is a list of
7543 typedefs used when declaring fields in this struct. If the name
7544 of any of the fields is also a typedef name then the struct would
7545 not parse in C++, because the C++ lookup rules say that the
7546 typedef name would be looked up in the context of the struct, and
7547 would thus be the field rather than the typedef. */
7548 if (!struct_parse_info
->typedefs_seen
.is_empty ()
7549 && fieldlist
!= NULL_TREE
)
7551 /* Use a hash_set<tree> using the name of the typedef. We can use
7552 a hash_set<tree> because identifiers are interned. */
7553 hash_set
<tree
> tset
;
7555 FOR_EACH_VEC_ELT (struct_parse_info
->typedefs_seen
, ix
, x
)
7556 tset
.add (DECL_NAME (x
));
7558 for (x
= fieldlist
; x
!= NULL_TREE
; x
= DECL_CHAIN (x
))
7560 if (DECL_NAME (x
) != NULL_TREE
7561 && tset
.contains (DECL_NAME (x
)))
7563 warning_at (DECL_SOURCE_LOCATION (x
), OPT_Wc___compat
,
7564 ("using %qD as both field and typedef name is "
7567 /* FIXME: It would be nice to report the location where
7568 the typedef name is used. */
7573 /* For each field which has a binding and which was not defined in
7574 an enclosing struct, clear the in_struct field. */
7575 FOR_EACH_VEC_ELT (struct_parse_info
->fields
, ix
, b
)
7579 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
7580 LOC is the location of the RECORD_TYPE or UNION_TYPE's definition.
7581 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
7582 ATTRIBUTES are attributes to be applied to the structure.
7584 ENCLOSING_STRUCT_PARSE_INFO is the value of STRUCT_PARSE_INFO when
7585 the struct was started. */
7588 finish_struct (location_t loc
, tree t
, tree fieldlist
, tree attributes
,
7589 struct c_struct_parse_info
*enclosing_struct_parse_info
)
7592 bool toplevel
= file_scope
== current_scope
;
7593 int saw_named_field
;
7595 /* If this type was previously laid out as a forward reference,
7596 make sure we lay it out again. */
7600 decl_attributes (&t
, attributes
, (int) ATTR_FLAG_TYPE_IN_PLACE
);
7604 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
7606 if (DECL_NAME (x
) != 0)
7609 && (TREE_CODE (TREE_TYPE (x
)) == RECORD_TYPE
7610 || TREE_CODE (TREE_TYPE (x
)) == UNION_TYPE
))
7616 if (TREE_CODE (t
) == UNION_TYPE
)
7619 pedwarn (loc
, OPT_Wpedantic
, "union has no named members");
7621 pedwarn (loc
, OPT_Wpedantic
, "union has no members");
7626 pedwarn (loc
, OPT_Wpedantic
, "struct has no named members");
7628 pedwarn (loc
, OPT_Wpedantic
, "struct has no members");
7633 /* Install struct as DECL_CONTEXT of each field decl.
7634 Also process specified field sizes, found in the DECL_INITIAL,
7635 storing 0 there after the type has been changed to precision equal
7636 to its width, rather than the precision of the specified standard
7637 type. (Correct layout requires the original type to have been preserved
7640 saw_named_field
= 0;
7641 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
7643 if (TREE_TYPE (x
) == error_mark_node
)
7646 DECL_CONTEXT (x
) = t
;
7648 /* If any field is const, the structure type is pseudo-const. */
7649 if (TREE_READONLY (x
))
7650 C_TYPE_FIELDS_READONLY (t
) = 1;
7653 /* A field that is pseudo-const makes the structure likewise. */
7654 tree t1
= strip_array_types (TREE_TYPE (x
));
7655 if ((TREE_CODE (t1
) == RECORD_TYPE
|| TREE_CODE (t1
) == UNION_TYPE
)
7656 && C_TYPE_FIELDS_READONLY (t1
))
7657 C_TYPE_FIELDS_READONLY (t
) = 1;
7660 /* Any field that is volatile means variables of this type must be
7661 treated in some ways as volatile. */
7662 if (TREE_THIS_VOLATILE (x
))
7663 C_TYPE_FIELDS_VOLATILE (t
) = 1;
7665 /* Any field of nominal variable size implies structure is too. */
7666 if (C_DECL_VARIABLE_SIZE (x
))
7667 C_TYPE_VARIABLE_SIZE (t
) = 1;
7669 if (DECL_INITIAL (x
))
7671 unsigned HOST_WIDE_INT width
= tree_to_uhwi (DECL_INITIAL (x
));
7672 DECL_SIZE (x
) = bitsize_int (width
);
7673 DECL_BIT_FIELD (x
) = 1;
7674 SET_DECL_C_BIT_FIELD (x
);
7678 && (DECL_BIT_FIELD (x
)
7679 || TYPE_ALIGN (TREE_TYPE (x
)) > BITS_PER_UNIT
))
7680 DECL_PACKED (x
) = 1;
7682 /* Detect flexible array member in an invalid context. */
7683 if (TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
7684 && TYPE_SIZE (TREE_TYPE (x
)) == NULL_TREE
7685 && TYPE_DOMAIN (TREE_TYPE (x
)) != NULL_TREE
7686 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x
))) == NULL_TREE
)
7688 if (TREE_CODE (t
) == UNION_TYPE
)
7690 error_at (DECL_SOURCE_LOCATION (x
),
7691 "flexible array member in union");
7692 TREE_TYPE (x
) = error_mark_node
;
7694 else if (DECL_CHAIN (x
) != NULL_TREE
)
7696 error_at (DECL_SOURCE_LOCATION (x
),
7697 "flexible array member not at end of struct");
7698 TREE_TYPE (x
) = error_mark_node
;
7700 else if (!saw_named_field
)
7702 error_at (DECL_SOURCE_LOCATION (x
),
7703 "flexible array member in otherwise empty struct");
7704 TREE_TYPE (x
) = error_mark_node
;
7708 if (pedantic
&& TREE_CODE (t
) == RECORD_TYPE
7709 && flexible_array_type_p (TREE_TYPE (x
)))
7710 pedwarn (DECL_SOURCE_LOCATION (x
), OPT_Wpedantic
,
7711 "invalid use of structure with flexible array member");
7714 || TREE_CODE (TREE_TYPE (x
)) == RECORD_TYPE
7715 || TREE_CODE (TREE_TYPE (x
)) == UNION_TYPE
)
7716 saw_named_field
= 1;
7719 detect_field_duplicates (fieldlist
);
7721 /* Now we have the nearly final fieldlist. Record it,
7722 then lay out the structure or union (including the fields). */
7724 TYPE_FIELDS (t
) = fieldlist
;
7728 if (TYPE_SIZE_UNIT (t
)
7729 && TREE_CODE (TYPE_SIZE_UNIT (t
)) == INTEGER_CST
7730 && !TREE_OVERFLOW (TYPE_SIZE_UNIT (t
))
7731 && !valid_constant_size_p (TYPE_SIZE_UNIT (t
)))
7732 error ("type %qT is too large", t
);
7734 /* Give bit-fields their proper types. */
7736 tree
*fieldlistp
= &fieldlist
;
7738 if (TREE_CODE (*fieldlistp
) == FIELD_DECL
&& DECL_INITIAL (*fieldlistp
)
7739 && TREE_TYPE (*fieldlistp
) != error_mark_node
)
7741 unsigned HOST_WIDE_INT width
7742 = tree_to_uhwi (DECL_INITIAL (*fieldlistp
));
7743 tree type
= TREE_TYPE (*fieldlistp
);
7744 if (width
!= TYPE_PRECISION (type
))
7746 TREE_TYPE (*fieldlistp
)
7747 = c_build_bitfield_integer_type (width
, TYPE_UNSIGNED (type
));
7748 DECL_MODE (*fieldlistp
) = TYPE_MODE (TREE_TYPE (*fieldlistp
));
7750 DECL_INITIAL (*fieldlistp
) = 0;
7753 fieldlistp
= &DECL_CHAIN (*fieldlistp
);
7756 /* Now we have the truly final field list.
7757 Store it in this type and in the variants. */
7759 TYPE_FIELDS (t
) = fieldlist
;
7761 /* If there are lots of fields, sort so we can look through them fast.
7762 We arbitrarily consider 16 or more elts to be "a lot". */
7767 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
7769 if (len
> 15 || DECL_NAME (x
) == NULL
)
7777 struct lang_type
*space
;
7778 struct sorted_fields_type
*space2
;
7780 len
+= list_length (x
);
7782 /* Use the same allocation policy here that make_node uses, to
7783 ensure that this lives as long as the rest of the struct decl.
7784 All decls in an inline function need to be saved. */
7786 space
= ggc_cleared_alloc
<struct lang_type
> ();
7787 space2
= (sorted_fields_type
*) ggc_internal_alloc
7788 (sizeof (struct sorted_fields_type
) + len
* sizeof (tree
));
7792 field_array
= &space2
->elts
[0];
7793 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
7795 field_array
[len
++] = x
;
7797 /* If there is anonymous struct or union, break out of the loop. */
7798 if (DECL_NAME (x
) == NULL
)
7801 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
7804 TYPE_LANG_SPECIFIC (t
) = space
;
7805 TYPE_LANG_SPECIFIC (t
)->s
->len
= len
;
7806 field_array
= TYPE_LANG_SPECIFIC (t
)->s
->elts
;
7807 qsort (field_array
, len
, sizeof (tree
), field_decl_cmp
);
7812 for (x
= TYPE_MAIN_VARIANT (t
); x
; x
= TYPE_NEXT_VARIANT (x
))
7814 TYPE_FIELDS (x
) = TYPE_FIELDS (t
);
7815 TYPE_LANG_SPECIFIC (x
) = TYPE_LANG_SPECIFIC (t
);
7816 C_TYPE_FIELDS_READONLY (x
) = C_TYPE_FIELDS_READONLY (t
);
7817 C_TYPE_FIELDS_VOLATILE (x
) = C_TYPE_FIELDS_VOLATILE (t
);
7818 C_TYPE_VARIABLE_SIZE (x
) = C_TYPE_VARIABLE_SIZE (t
);
7821 /* If this was supposed to be a transparent union, but we can't
7822 make it one, warn and turn off the flag. */
7823 if (TREE_CODE (t
) == UNION_TYPE
7824 && TYPE_TRANSPARENT_AGGR (t
)
7825 && (!TYPE_FIELDS (t
) || TYPE_MODE (t
) != DECL_MODE (TYPE_FIELDS (t
))))
7827 TYPE_TRANSPARENT_AGGR (t
) = 0;
7828 warning_at (loc
, 0, "union cannot be made transparent");
7831 /* If this structure or union completes the type of any previous
7832 variable declaration, lay it out and output its rtl. */
7833 for (x
= C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t
));
7837 tree decl
= TREE_VALUE (x
);
7838 if (TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
)
7839 layout_array_type (TREE_TYPE (decl
));
7840 if (TREE_CODE (decl
) != TYPE_DECL
)
7842 layout_decl (decl
, 0);
7843 if (c_dialect_objc ())
7844 objc_check_decl (decl
);
7845 rest_of_decl_compilation (decl
, toplevel
, 0);
7848 C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t
)) = 0;
7850 /* Update type location to the one of the definition, instead of e.g.
7851 a forward declaration. */
7852 if (TYPE_STUB_DECL (t
))
7853 DECL_SOURCE_LOCATION (TYPE_STUB_DECL (t
)) = loc
;
7855 /* Finish debugging output for this type. */
7856 rest_of_type_compilation (t
, toplevel
);
7858 /* If we're inside a function proper, i.e. not file-scope and not still
7859 parsing parameters, then arrange for the size of a variable sized type
7861 if (building_stmt_list_p () && variably_modified_type_p (t
, NULL_TREE
))
7862 add_stmt (build_stmt (loc
,
7863 DECL_EXPR
, build_decl (loc
, TYPE_DECL
, NULL
, t
)));
7865 if (warn_cxx_compat
)
7866 warn_cxx_compat_finish_struct (fieldlist
);
7868 struct_parse_info
->struct_types
.release ();
7869 struct_parse_info
->fields
.release ();
7870 struct_parse_info
->typedefs_seen
.release ();
7871 XDELETE (struct_parse_info
);
7873 struct_parse_info
= enclosing_struct_parse_info
;
7875 /* If this struct is defined inside a struct, add it to
7878 && struct_parse_info
!= NULL
7879 && !in_sizeof
&& !in_typeof
&& !in_alignof
)
7880 struct_parse_info
->struct_types
.safe_push (t
);
7885 /* Lay out the type T, and its element type, and so on. */
7888 layout_array_type (tree t
)
7890 if (TREE_CODE (TREE_TYPE (t
)) == ARRAY_TYPE
)
7891 layout_array_type (TREE_TYPE (t
));
7895 /* Begin compiling the definition of an enumeration type.
7896 NAME is its name (or null if anonymous).
7897 LOC is the enum's location.
7898 Returns the type object, as yet incomplete.
7899 Also records info about it so that build_enumerator
7900 may be used to declare the individual values as they are read. */
7903 start_enum (location_t loc
, struct c_enum_contents
*the_enum
, tree name
)
7905 tree enumtype
= NULL_TREE
;
7906 location_t enumloc
= UNKNOWN_LOCATION
;
7908 /* If this is the real definition for a previous forward reference,
7909 fill in the contents in the same object that used to be the
7910 forward reference. */
7912 if (name
!= NULL_TREE
)
7913 enumtype
= lookup_tag (ENUMERAL_TYPE
, name
, 1, &enumloc
);
7915 if (enumtype
== 0 || TREE_CODE (enumtype
) != ENUMERAL_TYPE
)
7917 enumtype
= make_node (ENUMERAL_TYPE
);
7918 pushtag (loc
, name
, enumtype
);
7921 if (C_TYPE_BEING_DEFINED (enumtype
))
7922 error_at (loc
, "nested redefinition of %<enum %E%>", name
);
7924 C_TYPE_BEING_DEFINED (enumtype
) = 1;
7926 if (TYPE_VALUES (enumtype
) != 0)
7928 /* This enum is a named one that has been declared already. */
7929 error_at (loc
, "redeclaration of %<enum %E%>", name
);
7930 if (enumloc
!= UNKNOWN_LOCATION
)
7931 inform (enumloc
, "originally defined here");
7933 /* Completely replace its old definition.
7934 The old enumerators remain defined, however. */
7935 TYPE_VALUES (enumtype
) = 0;
7938 the_enum
->enum_next_value
= integer_zero_node
;
7939 the_enum
->enum_overflow
= 0;
7941 if (flag_short_enums
)
7942 TYPE_PACKED (enumtype
) = 1;
7944 /* FIXME: This will issue a warning for a use of a type defined
7945 within sizeof in a statement expr. This is not terribly serious
7946 as C++ doesn't permit statement exprs within sizeof anyhow. */
7947 if (warn_cxx_compat
&& (in_sizeof
|| in_typeof
|| in_alignof
))
7948 warning_at (loc
, OPT_Wc___compat
,
7949 "defining type in %qs expression is invalid in C++",
7952 : (in_typeof
? "typeof" : "alignof")));
7957 /* After processing and defining all the values of an enumeration type,
7958 install their decls in the enumeration type and finish it off.
7959 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
7960 and ATTRIBUTES are the specified attributes.
7961 Returns ENUMTYPE. */
7964 finish_enum (tree enumtype
, tree values
, tree attributes
)
7967 tree minnode
= 0, maxnode
= 0;
7970 bool toplevel
= (file_scope
== current_scope
);
7971 struct lang_type
*lt
;
7973 decl_attributes (&enumtype
, attributes
, (int) ATTR_FLAG_TYPE_IN_PLACE
);
7975 /* Calculate the maximum value of any enumerator in this type. */
7977 if (values
== error_mark_node
)
7978 minnode
= maxnode
= integer_zero_node
;
7981 minnode
= maxnode
= TREE_VALUE (values
);
7982 for (pair
= TREE_CHAIN (values
); pair
; pair
= TREE_CHAIN (pair
))
7984 tree value
= TREE_VALUE (pair
);
7985 if (tree_int_cst_lt (maxnode
, value
))
7987 if (tree_int_cst_lt (value
, minnode
))
7992 /* Construct the final type of this enumeration. It is the same
7993 as one of the integral types - the narrowest one that fits, except
7994 that normally we only go as narrow as int - and signed iff any of
7995 the values are negative. */
7996 sign
= (tree_int_cst_sgn (minnode
) >= 0) ? UNSIGNED
: SIGNED
;
7997 precision
= MAX (tree_int_cst_min_precision (minnode
, sign
),
7998 tree_int_cst_min_precision (maxnode
, sign
));
8000 if (TYPE_PACKED (enumtype
) || precision
> TYPE_PRECISION (integer_type_node
))
8002 tem
= c_common_type_for_size (precision
, sign
== UNSIGNED
? 1 : 0);
8005 warning (0, "enumeration values exceed range of largest integer");
8006 tem
= long_long_integer_type_node
;
8010 tem
= sign
== UNSIGNED
? unsigned_type_node
: integer_type_node
;
8012 TYPE_MIN_VALUE (enumtype
) = TYPE_MIN_VALUE (tem
);
8013 TYPE_MAX_VALUE (enumtype
) = TYPE_MAX_VALUE (tem
);
8014 TYPE_UNSIGNED (enumtype
) = TYPE_UNSIGNED (tem
);
8015 TYPE_ALIGN (enumtype
) = TYPE_ALIGN (tem
);
8016 TYPE_SIZE (enumtype
) = 0;
8018 /* If the precision of the type was specified with an attribute and it
8019 was too small, give an error. Otherwise, use it. */
8020 if (TYPE_PRECISION (enumtype
)
8021 && lookup_attribute ("mode", attributes
))
8023 if (precision
> TYPE_PRECISION (enumtype
))
8024 error ("specified mode too small for enumeral values");
8027 TYPE_PRECISION (enumtype
) = TYPE_PRECISION (tem
);
8029 layout_type (enumtype
);
8031 if (values
!= error_mark_node
)
8033 /* Change the type of the enumerators to be the enum type. We
8034 need to do this irrespective of the size of the enum, for
8035 proper type checking. Replace the DECL_INITIALs of the
8036 enumerators, and the value slots of the list, with copies
8037 that have the enum type; they cannot be modified in place
8038 because they may be shared (e.g. integer_zero_node) Finally,
8039 change the purpose slots to point to the names of the decls. */
8040 for (pair
= values
; pair
; pair
= TREE_CHAIN (pair
))
8042 tree enu
= TREE_PURPOSE (pair
);
8043 tree ini
= DECL_INITIAL (enu
);
8045 TREE_TYPE (enu
) = enumtype
;
8047 /* The ISO C Standard mandates enumerators to have type int,
8048 even though the underlying type of an enum type is
8049 unspecified. However, GCC allows enumerators of any
8050 integer type as an extensions. build_enumerator()
8051 converts any enumerators that fit in an int to type int,
8052 to avoid promotions to unsigned types when comparing
8053 integers with enumerators that fit in the int range.
8054 When -pedantic is given, build_enumerator() would have
8055 already warned about those that don't fit. Here we
8056 convert the rest to the enumerator type. */
8057 if (TREE_TYPE (ini
) != integer_type_node
)
8058 ini
= convert (enumtype
, ini
);
8060 DECL_INITIAL (enu
) = ini
;
8061 TREE_PURPOSE (pair
) = DECL_NAME (enu
);
8062 TREE_VALUE (pair
) = ini
;
8065 TYPE_VALUES (enumtype
) = values
;
8068 /* Record the min/max values so that we can warn about bit-field
8069 enumerations that are too small for the values. */
8070 lt
= ggc_cleared_alloc
<struct lang_type
> ();
8071 lt
->enum_min
= minnode
;
8072 lt
->enum_max
= maxnode
;
8073 TYPE_LANG_SPECIFIC (enumtype
) = lt
;
8075 /* Fix up all variant types of this enum type. */
8076 for (tem
= TYPE_MAIN_VARIANT (enumtype
); tem
; tem
= TYPE_NEXT_VARIANT (tem
))
8078 if (tem
== enumtype
)
8080 TYPE_VALUES (tem
) = TYPE_VALUES (enumtype
);
8081 TYPE_MIN_VALUE (tem
) = TYPE_MIN_VALUE (enumtype
);
8082 TYPE_MAX_VALUE (tem
) = TYPE_MAX_VALUE (enumtype
);
8083 TYPE_SIZE (tem
) = TYPE_SIZE (enumtype
);
8084 TYPE_SIZE_UNIT (tem
) = TYPE_SIZE_UNIT (enumtype
);
8085 SET_TYPE_MODE (tem
, TYPE_MODE (enumtype
));
8086 TYPE_PRECISION (tem
) = TYPE_PRECISION (enumtype
);
8087 TYPE_ALIGN (tem
) = TYPE_ALIGN (enumtype
);
8088 TYPE_USER_ALIGN (tem
) = TYPE_USER_ALIGN (enumtype
);
8089 TYPE_UNSIGNED (tem
) = TYPE_UNSIGNED (enumtype
);
8090 TYPE_LANG_SPECIFIC (tem
) = TYPE_LANG_SPECIFIC (enumtype
);
8093 /* Finish debugging output for this type. */
8094 rest_of_type_compilation (enumtype
, toplevel
);
8096 /* If this enum is defined inside a struct, add it to
8099 && struct_parse_info
!= NULL
8100 && !in_sizeof
&& !in_typeof
&& !in_alignof
)
8101 struct_parse_info
->struct_types
.safe_push (enumtype
);
8106 /* Build and install a CONST_DECL for one value of the
8107 current enumeration type (one that was begun with start_enum).
8108 DECL_LOC is the location of the enumerator.
8109 LOC is the location of the '=' operator if any, DECL_LOC otherwise.
8110 Return a tree-list containing the CONST_DECL and its value.
8111 Assignment of sequential values by default is handled here. */
8114 build_enumerator (location_t decl_loc
, location_t loc
,
8115 struct c_enum_contents
*the_enum
, tree name
, tree value
)
8119 /* Validate and default VALUE. */
8123 /* Don't issue more errors for error_mark_node (i.e. an
8124 undeclared identifier) - just ignore the value expression. */
8125 if (value
== error_mark_node
)
8127 else if (!INTEGRAL_TYPE_P (TREE_TYPE (value
)))
8129 error_at (loc
, "enumerator value for %qE is not an integer constant",
8135 if (TREE_CODE (value
) != INTEGER_CST
)
8137 value
= c_fully_fold (value
, false, NULL
);
8138 if (TREE_CODE (value
) == INTEGER_CST
)
8139 pedwarn (loc
, OPT_Wpedantic
,
8140 "enumerator value for %qE is not an integer "
8141 "constant expression", name
);
8143 if (TREE_CODE (value
) != INTEGER_CST
)
8145 error ("enumerator value for %qE is not an integer constant",
8151 value
= default_conversion (value
);
8152 constant_expression_warning (value
);
8157 /* Default based on previous value. */
8158 /* It should no longer be possible to have NON_LVALUE_EXPR
8162 value
= the_enum
->enum_next_value
;
8163 if (the_enum
->enum_overflow
)
8164 error_at (loc
, "overflow in enumeration values");
8166 /* Even though the underlying type of an enum is unspecified, the
8167 type of enumeration constants is explicitly defined as int
8168 (6.4.4.3/2 in the C99 Standard). GCC allows any integer type as
8170 else if (!int_fits_type_p (value
, integer_type_node
))
8171 pedwarn (loc
, OPT_Wpedantic
,
8172 "ISO C restricts enumerator values to range of %<int%>");
8174 /* The ISO C Standard mandates enumerators to have type int, even
8175 though the underlying type of an enum type is unspecified.
8176 However, GCC allows enumerators of any integer type as an
8177 extensions. Here we convert any enumerators that fit in an int
8178 to type int, to avoid promotions to unsigned types when comparing
8179 integers with enumerators that fit in the int range. When
8180 -pedantic is given, we would have already warned about those that
8181 don't fit. We have to do this here rather than in finish_enum
8182 because this value may be used to define more enumerators. */
8183 if (int_fits_type_p (value
, integer_type_node
))
8184 value
= convert (integer_type_node
, value
);
8186 /* Set basis for default for next value. */
8187 the_enum
->enum_next_value
8188 = build_binary_op (EXPR_LOC_OR_LOC (value
, input_location
),
8189 PLUS_EXPR
, value
, integer_one_node
, 0);
8190 the_enum
->enum_overflow
= tree_int_cst_lt (the_enum
->enum_next_value
, value
);
8192 /* Now create a declaration for the enum value name. */
8194 type
= TREE_TYPE (value
);
8195 type
= c_common_type_for_size (MAX (TYPE_PRECISION (type
),
8196 TYPE_PRECISION (integer_type_node
)),
8197 (TYPE_PRECISION (type
)
8198 >= TYPE_PRECISION (integer_type_node
)
8199 && TYPE_UNSIGNED (type
)));
8201 decl
= build_decl (decl_loc
, CONST_DECL
, name
, type
);
8202 DECL_INITIAL (decl
) = convert (type
, value
);
8205 return tree_cons (decl
, value
, NULL_TREE
);
8209 /* Create the FUNCTION_DECL for a function definition.
8210 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
8211 the declaration; they describe the function's name and the type it returns,
8212 but twisted together in a fashion that parallels the syntax of C.
8214 This function creates a binding context for the function body
8215 as well as setting up the FUNCTION_DECL in current_function_decl.
8217 Returns 1 on success. If the DECLARATOR is not suitable for a function
8218 (it defines a datum instead), we return 0, which tells
8219 yyparse to report a parse error. */
8222 start_function (struct c_declspecs
*declspecs
, struct c_declarator
*declarator
,
8225 tree decl1
, old_decl
;
8226 tree restype
, resdecl
;
8229 current_function_returns_value
= 0; /* Assume, until we see it does. */
8230 current_function_returns_null
= 0;
8231 current_function_returns_abnormally
= 0;
8232 warn_about_return_type
= 0;
8233 c_switch_stack
= NULL
;
8235 /* Indicate no valid break/continue context by setting these variables
8236 to some non-null, non-label value. We'll notice and emit the proper
8237 error message in c_finish_bc_stmt. */
8238 c_break_label
= c_cont_label
= size_zero_node
;
8240 decl1
= grokdeclarator (declarator
, declspecs
, FUNCDEF
, true, NULL
,
8241 &attributes
, NULL
, NULL
, DEPRECATED_NORMAL
);
8242 invoke_plugin_callbacks (PLUGIN_START_PARSE_FUNCTION
, decl1
);
8244 /* If the declarator is not suitable for a function definition,
8245 cause a syntax error. */
8247 || TREE_CODE (decl1
) != FUNCTION_DECL
)
8250 loc
= DECL_SOURCE_LOCATION (decl1
);
8252 c_decl_attributes (&decl1
, attributes
, 0);
8254 if (DECL_DECLARED_INLINE_P (decl1
)
8255 && DECL_UNINLINABLE (decl1
)
8256 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1
)))
8257 warning_at (loc
, OPT_Wattributes
,
8258 "inline function %qD given attribute noinline",
8261 /* Handle gnu_inline attribute. */
8262 if (declspecs
->inline_p
8263 && !flag_gnu89_inline
8264 && TREE_CODE (decl1
) == FUNCTION_DECL
8265 && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl1
))
8266 || current_function_decl
))
8268 if (declspecs
->storage_class
!= csc_static
)
8269 DECL_EXTERNAL (decl1
) = !DECL_EXTERNAL (decl1
);
8272 announce_function (decl1
);
8274 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1
))))
8276 error_at (loc
, "return type is an incomplete type");
8277 /* Make it return void instead. */
8279 = build_function_type (void_type_node
,
8280 TYPE_ARG_TYPES (TREE_TYPE (decl1
)));
8283 if (warn_about_return_type
)
8284 warn_defaults_to (loc
, flag_isoc99
? OPT_Wimplicit_int
8285 : (warn_return_type
? OPT_Wreturn_type
8286 : OPT_Wimplicit_int
),
8287 "return type defaults to %<int%>");
8289 /* Make the init_value nonzero so pushdecl knows this is not tentative.
8290 error_mark_node is replaced below (in pop_scope) with the BLOCK. */
8291 DECL_INITIAL (decl1
) = error_mark_node
;
8293 /* A nested function is not global. */
8294 if (current_function_decl
!= 0)
8295 TREE_PUBLIC (decl1
) = 0;
8297 /* If this definition isn't a prototype and we had a prototype declaration
8298 before, copy the arg type info from that prototype. */
8299 old_decl
= lookup_name_in_scope (DECL_NAME (decl1
), current_scope
);
8300 if (old_decl
&& TREE_CODE (old_decl
) != FUNCTION_DECL
)
8302 current_function_prototype_locus
= UNKNOWN_LOCATION
;
8303 current_function_prototype_built_in
= false;
8304 current_function_prototype_arg_types
= NULL_TREE
;
8305 if (!prototype_p (TREE_TYPE (decl1
)))
8307 if (old_decl
!= 0 && TREE_CODE (TREE_TYPE (old_decl
)) == FUNCTION_TYPE
8308 && comptypes (TREE_TYPE (TREE_TYPE (decl1
)),
8309 TREE_TYPE (TREE_TYPE (old_decl
))))
8311 TREE_TYPE (decl1
) = composite_type (TREE_TYPE (old_decl
),
8313 current_function_prototype_locus
= DECL_SOURCE_LOCATION (old_decl
);
8314 current_function_prototype_built_in
8315 = C_DECL_BUILTIN_PROTOTYPE (old_decl
);
8316 current_function_prototype_arg_types
8317 = TYPE_ARG_TYPES (TREE_TYPE (decl1
));
8319 if (TREE_PUBLIC (decl1
))
8321 /* If there is an external prototype declaration of this
8322 function, record its location but do not copy information
8323 to this decl. This may be an invisible declaration
8324 (built-in or in a scope which has finished) or simply
8325 have more refined argument types than any declaration
8327 struct c_binding
*b
;
8328 for (b
= I_SYMBOL_BINDING (DECL_NAME (decl1
)); b
; b
= b
->shadowed
)
8329 if (B_IN_SCOPE (b
, external_scope
))
8333 tree ext_decl
, ext_type
;
8335 ext_type
= b
->u
.type
? b
->u
.type
: TREE_TYPE (ext_decl
);
8336 if (TREE_CODE (ext_type
) == FUNCTION_TYPE
8337 && comptypes (TREE_TYPE (TREE_TYPE (decl1
)),
8338 TREE_TYPE (ext_type
)))
8340 current_function_prototype_locus
8341 = DECL_SOURCE_LOCATION (ext_decl
);
8342 current_function_prototype_built_in
8343 = C_DECL_BUILTIN_PROTOTYPE (ext_decl
);
8344 current_function_prototype_arg_types
8345 = TYPE_ARG_TYPES (ext_type
);
8351 /* Optionally warn of old-fashioned def with no previous prototype. */
8352 if (warn_strict_prototypes
8353 && old_decl
!= error_mark_node
8354 && !prototype_p (TREE_TYPE (decl1
))
8355 && C_DECL_ISNT_PROTOTYPE (old_decl
))
8356 warning_at (loc
, OPT_Wstrict_prototypes
,
8357 "function declaration isn%'t a prototype");
8358 /* Optionally warn of any global def with no previous prototype. */
8359 else if (warn_missing_prototypes
8360 && old_decl
!= error_mark_node
8361 && TREE_PUBLIC (decl1
)
8362 && !MAIN_NAME_P (DECL_NAME (decl1
))
8363 && C_DECL_ISNT_PROTOTYPE (old_decl
)
8364 && !DECL_DECLARED_INLINE_P (decl1
))
8365 warning_at (loc
, OPT_Wmissing_prototypes
,
8366 "no previous prototype for %qD", decl1
);
8367 /* Optionally warn of any def with no previous prototype
8368 if the function has already been used. */
8369 else if (warn_missing_prototypes
8371 && old_decl
!= error_mark_node
8372 && TREE_USED (old_decl
)
8373 && !prototype_p (TREE_TYPE (old_decl
)))
8374 warning_at (loc
, OPT_Wmissing_prototypes
,
8375 "%qD was used with no prototype before its definition", decl1
);
8376 /* Optionally warn of any global def with no previous declaration. */
8377 else if (warn_missing_declarations
8378 && TREE_PUBLIC (decl1
)
8380 && !MAIN_NAME_P (DECL_NAME (decl1
))
8381 && !DECL_DECLARED_INLINE_P (decl1
))
8382 warning_at (loc
, OPT_Wmissing_declarations
,
8383 "no previous declaration for %qD",
8385 /* Optionally warn of any def with no previous declaration
8386 if the function has already been used. */
8387 else if (warn_missing_declarations
8389 && old_decl
!= error_mark_node
8390 && TREE_USED (old_decl
)
8391 && C_DECL_IMPLICIT (old_decl
))
8392 warning_at (loc
, OPT_Wmissing_declarations
,
8393 "%qD was used with no declaration before its definition", decl1
);
8395 /* This function exists in static storage.
8396 (This does not mean `static' in the C sense!) */
8397 TREE_STATIC (decl1
) = 1;
8399 /* This is the earliest point at which we might know the assembler
8400 name of the function. Thus, if it's set before this, die horribly. */
8401 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl1
));
8403 /* If #pragma weak was used, mark the decl weak now. */
8404 if (current_scope
== file_scope
)
8405 maybe_apply_pragma_weak (decl1
);
8407 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
8408 if (warn_main
&& MAIN_NAME_P (DECL_NAME (decl1
)))
8410 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1
)))
8411 != integer_type_node
)
8412 pedwarn (loc
, OPT_Wmain
, "return type of %qD is not %<int%>", decl1
);
8413 else if (TYPE_ATOMIC (TREE_TYPE (TREE_TYPE (decl1
))))
8414 pedwarn (loc
, OPT_Wmain
, "%<_Atomic%>-qualified return type of %qD",
8417 check_main_parameter_types (decl1
);
8419 if (!TREE_PUBLIC (decl1
))
8420 pedwarn (loc
, OPT_Wmain
,
8421 "%qD is normally a non-static function", decl1
);
8424 /* Record the decl so that the function name is defined.
8425 If we already have a decl for this name, and it is a FUNCTION_DECL,
8426 use the old decl. */
8428 current_function_decl
= pushdecl (decl1
);
8431 declare_parm_level ();
8433 restype
= TREE_TYPE (TREE_TYPE (current_function_decl
));
8434 resdecl
= build_decl (loc
, RESULT_DECL
, NULL_TREE
, restype
);
8435 DECL_ARTIFICIAL (resdecl
) = 1;
8436 DECL_IGNORED_P (resdecl
) = 1;
8437 DECL_RESULT (current_function_decl
) = resdecl
;
8439 start_fname_decls ();
8444 /* Subroutine of store_parm_decls which handles new-style function
8445 definitions (prototype format). The parms already have decls, so we
8446 need only record them as in effect and complain if any redundant
8447 old-style parm decls were written. */
8449 store_parm_decls_newstyle (tree fndecl
, const struct c_arg_info
*arg_info
)
8455 if (current_scope
->bindings
)
8457 error_at (DECL_SOURCE_LOCATION (fndecl
),
8458 "old-style parameter declarations in prototyped "
8459 "function definition");
8461 /* Get rid of the old-style declarations. */
8465 /* Don't issue this warning for nested functions, and don't issue this
8466 warning if we got here because ARG_INFO_TYPES was error_mark_node
8467 (this happens when a function definition has just an ellipsis in
8468 its parameter list). */
8469 else if (!in_system_header_at (input_location
)
8470 && !current_function_scope
8471 && arg_info
->types
!= error_mark_node
)
8472 warning_at (DECL_SOURCE_LOCATION (fndecl
), OPT_Wtraditional
,
8473 "traditional C rejects ISO C style function definitions");
8475 /* Now make all the parameter declarations visible in the function body.
8476 We can bypass most of the grunt work of pushdecl. */
8477 for (decl
= arg_info
->parms
; decl
; decl
= DECL_CHAIN (decl
))
8479 DECL_CONTEXT (decl
) = current_function_decl
;
8480 if (DECL_NAME (decl
))
8482 bind (DECL_NAME (decl
), decl
, current_scope
,
8483 /*invisible=*/false, /*nested=*/false,
8485 if (!TREE_USED (decl
))
8486 warn_if_shadowing (decl
);
8489 error_at (DECL_SOURCE_LOCATION (decl
), "parameter name omitted");
8492 /* Record the parameter list in the function declaration. */
8493 DECL_ARGUMENTS (fndecl
) = arg_info
->parms
;
8495 /* Now make all the ancillary declarations visible, likewise. */
8496 for (decl
= arg_info
->others
; decl
; decl
= DECL_CHAIN (decl
))
8498 DECL_CONTEXT (decl
) = current_function_decl
;
8499 if (DECL_NAME (decl
))
8500 bind (DECL_NAME (decl
), decl
, current_scope
,
8501 /*invisible=*/false,
8502 /*nested=*/(TREE_CODE (decl
) == FUNCTION_DECL
),
8506 /* And all the tag declarations. */
8507 FOR_EACH_VEC_SAFE_ELT_REVERSE (arg_info
->tags
, ix
, tag
)
8509 bind (tag
->id
, tag
->type
, current_scope
,
8510 /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION
);
8513 /* Subroutine of store_parm_decls which handles old-style function
8514 definitions (separate parameter list and declarations). */
8517 store_parm_decls_oldstyle (tree fndecl
, const struct c_arg_info
*arg_info
)
8519 struct c_binding
*b
;
8520 tree parm
, decl
, last
;
8521 tree parmids
= arg_info
->parms
;
8522 hash_set
<tree
> seen_args
;
8524 if (!in_system_header_at (input_location
))
8525 warning_at (DECL_SOURCE_LOCATION (fndecl
),
8526 OPT_Wold_style_definition
, "old-style function definition");
8528 /* Match each formal parameter name with its declaration. Save each
8529 decl in the appropriate TREE_PURPOSE slot of the parmids chain. */
8530 for (parm
= parmids
; parm
; parm
= TREE_CHAIN (parm
))
8532 if (TREE_VALUE (parm
) == 0)
8534 error_at (DECL_SOURCE_LOCATION (fndecl
),
8535 "parameter name missing from parameter list");
8536 TREE_PURPOSE (parm
) = 0;
8540 b
= I_SYMBOL_BINDING (TREE_VALUE (parm
));
8541 if (b
&& B_IN_CURRENT_SCOPE (b
))
8544 /* Skip erroneous parameters. */
8545 if (decl
== error_mark_node
)
8547 /* If we got something other than a PARM_DECL it is an error. */
8548 if (TREE_CODE (decl
) != PARM_DECL
)
8549 error_at (DECL_SOURCE_LOCATION (decl
),
8550 "%qD declared as a non-parameter", decl
);
8551 /* If the declaration is already marked, we have a duplicate
8552 name. Complain and ignore the duplicate. */
8553 else if (seen_args
.contains (decl
))
8555 error_at (DECL_SOURCE_LOCATION (decl
),
8556 "multiple parameters named %qD", decl
);
8557 TREE_PURPOSE (parm
) = 0;
8560 /* If the declaration says "void", complain and turn it into
8562 else if (VOID_TYPE_P (TREE_TYPE (decl
)))
8564 error_at (DECL_SOURCE_LOCATION (decl
),
8565 "parameter %qD declared with void type", decl
);
8566 TREE_TYPE (decl
) = integer_type_node
;
8567 DECL_ARG_TYPE (decl
) = integer_type_node
;
8568 layout_decl (decl
, 0);
8570 warn_if_shadowing (decl
);
8572 /* If no declaration found, default to int. */
8575 /* FIXME diagnostics: This should be the location of the argument,
8576 not the FNDECL. E.g., for an old-style declaration
8578 int f10(v) { blah; }
8580 We should use the location of the V, not the F10.
8581 Unfortunately, the V is an IDENTIFIER_NODE which has no
8582 location. In the future we need locations for c_arg_info
8585 See gcc.dg/Wshadow-3.c for an example of this problem. */
8586 decl
= build_decl (DECL_SOURCE_LOCATION (fndecl
),
8587 PARM_DECL
, TREE_VALUE (parm
), integer_type_node
);
8588 DECL_ARG_TYPE (decl
) = TREE_TYPE (decl
);
8590 warn_if_shadowing (decl
);
8593 pedwarn (DECL_SOURCE_LOCATION (decl
),
8594 OPT_Wimplicit_int
, "type of %qD defaults to %<int%>",
8597 warning_at (DECL_SOURCE_LOCATION (decl
),
8598 OPT_Wmissing_parameter_type
,
8599 "type of %qD defaults to %<int%>", decl
);
8602 TREE_PURPOSE (parm
) = decl
;
8603 seen_args
.add (decl
);
8606 /* Now examine the parms chain for incomplete declarations
8607 and declarations with no corresponding names. */
8609 for (b
= current_scope
->bindings
; b
; b
= b
->prev
)
8612 if (TREE_CODE (parm
) != PARM_DECL
)
8615 if (TREE_TYPE (parm
) != error_mark_node
8616 && !COMPLETE_TYPE_P (TREE_TYPE (parm
)))
8618 error_at (DECL_SOURCE_LOCATION (parm
),
8619 "parameter %qD has incomplete type", parm
);
8620 TREE_TYPE (parm
) = error_mark_node
;
8623 if (!seen_args
.contains (parm
))
8625 error_at (DECL_SOURCE_LOCATION (parm
),
8626 "declaration for parameter %qD but no such parameter",
8629 /* Pretend the parameter was not missing.
8630 This gets us to a standard state and minimizes
8631 further error messages. */
8632 parmids
= chainon (parmids
, tree_cons (parm
, 0, 0));
8636 /* Chain the declarations together in the order of the list of
8637 names. Store that chain in the function decl, replacing the
8638 list of names. Update the current scope to match. */
8639 DECL_ARGUMENTS (fndecl
) = 0;
8641 for (parm
= parmids
; parm
; parm
= TREE_CHAIN (parm
))
8642 if (TREE_PURPOSE (parm
))
8644 if (parm
&& TREE_PURPOSE (parm
))
8646 last
= TREE_PURPOSE (parm
);
8647 DECL_ARGUMENTS (fndecl
) = last
;
8649 for (parm
= TREE_CHAIN (parm
); parm
; parm
= TREE_CHAIN (parm
))
8650 if (TREE_PURPOSE (parm
))
8652 DECL_CHAIN (last
) = TREE_PURPOSE (parm
);
8653 last
= TREE_PURPOSE (parm
);
8655 DECL_CHAIN (last
) = 0;
8658 /* If there was a previous prototype,
8659 set the DECL_ARG_TYPE of each argument according to
8660 the type previously specified, and report any mismatches. */
8662 if (current_function_prototype_arg_types
)
8665 for (parm
= DECL_ARGUMENTS (fndecl
),
8666 type
= current_function_prototype_arg_types
;
8667 parm
|| (type
&& TREE_VALUE (type
) != error_mark_node
8668 && (TYPE_MAIN_VARIANT (TREE_VALUE (type
)) != void_type_node
));
8669 parm
= DECL_CHAIN (parm
), type
= TREE_CHAIN (type
))
8671 if (parm
== 0 || type
== 0
8672 || TYPE_MAIN_VARIANT (TREE_VALUE (type
)) == void_type_node
)
8674 if (current_function_prototype_built_in
)
8675 warning_at (DECL_SOURCE_LOCATION (fndecl
),
8676 0, "number of arguments doesn%'t match "
8677 "built-in prototype");
8680 /* FIXME diagnostics: This should be the location of
8681 FNDECL, but there is bug when a prototype is
8682 declared inside function context, but defined
8683 outside of it (e.g., gcc.dg/pr15698-2.c). In
8684 which case FNDECL gets the location of the
8685 prototype, not the definition. */
8686 error_at (input_location
,
8687 "number of arguments doesn%'t match prototype");
8689 error_at (current_function_prototype_locus
,
8690 "prototype declaration");
8694 /* Type for passing arg must be consistent with that
8695 declared for the arg. ISO C says we take the unqualified
8696 type for parameters declared with qualified type. */
8697 if (TREE_TYPE (parm
) != error_mark_node
8698 && TREE_TYPE (type
) != error_mark_node
8699 && ((TYPE_ATOMIC (DECL_ARG_TYPE (parm
))
8700 != TYPE_ATOMIC (TREE_VALUE (type
)))
8701 || !comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm
)),
8702 TYPE_MAIN_VARIANT (TREE_VALUE (type
)))))
8704 if ((TYPE_ATOMIC (DECL_ARG_TYPE (parm
))
8705 == TYPE_ATOMIC (TREE_VALUE (type
)))
8706 && (TYPE_MAIN_VARIANT (TREE_TYPE (parm
))
8707 == TYPE_MAIN_VARIANT (TREE_VALUE (type
))))
8709 /* Adjust argument to match prototype. E.g. a previous
8710 `int foo(float);' prototype causes
8711 `int foo(x) float x; {...}' to be treated like
8712 `int foo(float x) {...}'. This is particularly
8713 useful for argument types like uid_t. */
8714 DECL_ARG_TYPE (parm
) = TREE_TYPE (parm
);
8716 if (targetm
.calls
.promote_prototypes (TREE_TYPE (current_function_decl
))
8717 && INTEGRAL_TYPE_P (TREE_TYPE (parm
))
8718 && TYPE_PRECISION (TREE_TYPE (parm
))
8719 < TYPE_PRECISION (integer_type_node
))
8720 DECL_ARG_TYPE (parm
)
8721 = c_type_promotes_to (TREE_TYPE (parm
));
8723 /* ??? Is it possible to get here with a
8724 built-in prototype or will it always have
8725 been diagnosed as conflicting with an
8726 old-style definition and discarded? */
8727 if (current_function_prototype_built_in
)
8728 warning_at (DECL_SOURCE_LOCATION (parm
),
8729 OPT_Wpedantic
, "promoted argument %qD "
8730 "doesn%'t match built-in prototype", parm
);
8733 pedwarn (DECL_SOURCE_LOCATION (parm
),
8734 OPT_Wpedantic
, "promoted argument %qD "
8735 "doesn%'t match prototype", parm
);
8736 pedwarn (current_function_prototype_locus
, OPT_Wpedantic
,
8737 "prototype declaration");
8742 if (current_function_prototype_built_in
)
8743 warning_at (DECL_SOURCE_LOCATION (parm
),
8744 0, "argument %qD doesn%'t match "
8745 "built-in prototype", parm
);
8748 error_at (DECL_SOURCE_LOCATION (parm
),
8749 "argument %qD doesn%'t match prototype", parm
);
8750 error_at (current_function_prototype_locus
,
8751 "prototype declaration");
8756 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl
)) = 0;
8759 /* Otherwise, create a prototype that would match. */
8763 tree actual
= 0, last
= 0, type
;
8765 for (parm
= DECL_ARGUMENTS (fndecl
); parm
; parm
= DECL_CHAIN (parm
))
8767 type
= tree_cons (NULL_TREE
, DECL_ARG_TYPE (parm
), NULL_TREE
);
8769 TREE_CHAIN (last
) = type
;
8774 type
= tree_cons (NULL_TREE
, void_type_node
, NULL_TREE
);
8776 TREE_CHAIN (last
) = type
;
8780 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
8781 of the type of this function, but we need to avoid having this
8782 affect the types of other similarly-typed functions, so we must
8783 first force the generation of an identical (but separate) type
8784 node for the relevant function type. The new node we create
8785 will be a variant of the main variant of the original function
8788 TREE_TYPE (fndecl
) = build_variant_type_copy (TREE_TYPE (fndecl
));
8790 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl
)) = actual
;
8794 /* Store parameter declarations passed in ARG_INFO into the current
8795 function declaration. */
8798 store_parm_decls_from (struct c_arg_info
*arg_info
)
8800 current_function_arg_info
= arg_info
;
8801 store_parm_decls ();
8804 /* Called by walk_tree to look for and update context-less labels. */
8807 set_labels_context_r (tree
*tp
, int *walk_subtrees
, void *data
)
8809 if (TREE_CODE (*tp
) == LABEL_EXPR
8810 && DECL_CONTEXT (LABEL_EXPR_LABEL (*tp
)) == NULL_TREE
)
8812 DECL_CONTEXT (LABEL_EXPR_LABEL (*tp
)) = static_cast<tree
>(data
);
8819 /* Store the parameter declarations into the current function declaration.
8820 This is called after parsing the parameter declarations, before
8821 digesting the body of the function.
8823 For an old-style definition, construct a prototype out of the old-style
8824 parameter declarations and inject it into the function's type. */
8827 store_parm_decls (void)
8829 tree fndecl
= current_function_decl
;
8832 /* The argument information block for FNDECL. */
8833 struct c_arg_info
*arg_info
= current_function_arg_info
;
8834 current_function_arg_info
= 0;
8836 /* True if this definition is written with a prototype. Note:
8837 despite C99 6.7.5.3p14, we can *not* treat an empty argument
8838 list in a function definition as equivalent to (void) -- an
8839 empty argument list specifies the function has no parameters,
8840 but only (void) sets up a prototype for future calls. */
8841 proto
= arg_info
->types
!= 0;
8844 store_parm_decls_newstyle (fndecl
, arg_info
);
8846 store_parm_decls_oldstyle (fndecl
, arg_info
);
8848 /* The next call to push_scope will be a function body. */
8850 next_is_function_body
= true;
8852 /* Write a record describing this function definition to the prototypes
8853 file (if requested). */
8855 gen_aux_info_record (fndecl
, 1, 0, proto
);
8857 /* Initialize the RTL code for the function. */
8858 allocate_struct_function (fndecl
, false);
8860 if (warn_unused_local_typedefs
)
8861 cfun
->language
= ggc_cleared_alloc
<language_function
> ();
8863 /* Begin the statement tree for this function. */
8864 DECL_SAVED_TREE (fndecl
) = push_stmt_list ();
8866 /* ??? Insert the contents of the pending sizes list into the function
8867 to be evaluated. The only reason left to have this is
8868 void foo(int n, int array[n++])
8869 because we throw away the array type in favor of a pointer type, and
8870 thus won't naturally see the SAVE_EXPR containing the increment. All
8871 other pending sizes would be handled by gimplify_parameters. */
8872 if (arg_info
->pending_sizes
)
8874 /* In very special circumstances, e.g. for code like
8876 void f (int a[i += 2]) {}
8877 we need to execute the atomic assignment on function entry.
8878 But in this case, it is not just a straight store, it has the
8879 op= form, which means that build_atomic_assign has generated
8880 gotos, labels, etc. Because at that time the function decl
8881 for F has not been created yet, those labels do not have any
8882 function context. But we have the fndecl now, so update the
8883 labels accordingly. gimplify_expr would crash otherwise. */
8884 walk_tree_without_duplicates (&arg_info
->pending_sizes
,
8885 set_labels_context_r
, fndecl
);
8886 add_stmt (arg_info
->pending_sizes
);
8890 /* Store PARM_DECLs in PARMS into scope temporarily. Used for
8891 c_finish_omp_declare_simd for function prototypes. No diagnostics
8895 temp_store_parm_decls (tree fndecl
, tree parms
)
8898 for (tree p
= parms
; p
; p
= DECL_CHAIN (p
))
8900 DECL_CONTEXT (p
) = fndecl
;
8902 bind (DECL_NAME (p
), p
, current_scope
,
8903 /*invisible=*/false, /*nested=*/false,
8908 /* Undo what temp_store_parm_decls did. */
8911 temp_pop_parm_decls (void)
8913 /* Clear all bindings in this temporary scope, so that
8914 pop_scope doesn't create a BLOCK. */
8915 struct c_binding
*b
= current_scope
->bindings
;
8916 current_scope
->bindings
= NULL
;
8917 for (; b
; b
= free_binding_and_advance (b
))
8919 gcc_assert (TREE_CODE (b
->decl
) == PARM_DECL
);
8920 gcc_assert (I_SYMBOL_BINDING (b
->id
) == b
);
8921 I_SYMBOL_BINDING (b
->id
) = b
->shadowed
;
8922 if (b
->shadowed
&& b
->shadowed
->u
.type
)
8923 TREE_TYPE (b
->shadowed
->decl
) = b
->shadowed
->u
.type
;
8929 /* Finish up a function declaration and compile that function
8930 all the way to assembler language output. Then free the storage
8931 for the function definition.
8933 This is called after parsing the body of the function definition. */
8936 finish_function (void)
8938 tree fndecl
= current_function_decl
;
8940 if (c_dialect_objc ())
8941 objc_finish_function ();
8943 if (TREE_CODE (fndecl
) == FUNCTION_DECL
8944 && targetm
.calls
.promote_prototypes (TREE_TYPE (fndecl
)))
8946 tree args
= DECL_ARGUMENTS (fndecl
);
8947 for (; args
; args
= DECL_CHAIN (args
))
8949 tree type
= TREE_TYPE (args
);
8950 if (INTEGRAL_TYPE_P (type
)
8951 && TYPE_PRECISION (type
) < TYPE_PRECISION (integer_type_node
))
8952 DECL_ARG_TYPE (args
) = c_type_promotes_to (type
);
8956 if (DECL_INITIAL (fndecl
) && DECL_INITIAL (fndecl
) != error_mark_node
)
8957 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl
)) = fndecl
;
8959 /* Must mark the RESULT_DECL as being in this function. */
8961 if (DECL_RESULT (fndecl
) && DECL_RESULT (fndecl
) != error_mark_node
)
8962 DECL_CONTEXT (DECL_RESULT (fndecl
)) = fndecl
;
8964 if (MAIN_NAME_P (DECL_NAME (fndecl
)) && flag_hosted
8965 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl
)))
8966 == integer_type_node
&& flag_isoc99
)
8968 /* Hack. We don't want the middle-end to warn that this return
8969 is unreachable, so we mark its location as special. Using
8970 UNKNOWN_LOCATION has the problem that it gets clobbered in
8971 annotate_one_with_locus. A cleaner solution might be to
8972 ensure ! should_carry_locus_p (stmt), but that needs a flag.
8974 c_finish_return (BUILTINS_LOCATION
, integer_zero_node
, NULL_TREE
);
8977 /* Tie off the statement tree for this function. */
8978 DECL_SAVED_TREE (fndecl
) = pop_stmt_list (DECL_SAVED_TREE (fndecl
));
8980 /* If the function has _Cilk_spawn in front of a function call inside it
8981 i.e. it is a spawning function, then add the appropriate Cilk plus
8982 functions inside. */
8983 if (fn_contains_cilk_spawn_p (cfun
))
8984 cfun
->cilk_frame_decl
= insert_cilk_frame (fndecl
);
8986 finish_fname_decls ();
8988 /* Complain if there's just no return statement. */
8989 if (warn_return_type
8990 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl
))) != VOID_TYPE
8991 && !current_function_returns_value
&& !current_function_returns_null
8992 /* Don't complain if we are no-return. */
8993 && !current_function_returns_abnormally
8994 /* Don't complain if we are declared noreturn. */
8995 && !TREE_THIS_VOLATILE (fndecl
)
8996 /* Don't warn for main(). */
8997 && !MAIN_NAME_P (DECL_NAME (fndecl
))
8998 /* Or if they didn't actually specify a return type. */
8999 && !C_FUNCTION_IMPLICIT_INT (fndecl
)
9000 /* Normally, with -Wreturn-type, flow will complain, but we might
9001 optimize out static functions. */
9002 && !TREE_PUBLIC (fndecl
))
9004 warning (OPT_Wreturn_type
,
9005 "no return statement in function returning non-void");
9006 TREE_NO_WARNING (fndecl
) = 1;
9009 /* Complain about parameters that are only set, but never otherwise used. */
9010 if (warn_unused_but_set_parameter
)
9014 for (decl
= DECL_ARGUMENTS (fndecl
);
9016 decl
= DECL_CHAIN (decl
))
9017 if (TREE_USED (decl
)
9018 && TREE_CODE (decl
) == PARM_DECL
9019 && !DECL_READ_P (decl
)
9021 && !DECL_ARTIFICIAL (decl
)
9022 && !TREE_NO_WARNING (decl
))
9023 warning_at (DECL_SOURCE_LOCATION (decl
),
9024 OPT_Wunused_but_set_parameter
,
9025 "parameter %qD set but not used", decl
);
9028 /* Complain about locally defined typedefs that are not used in this
9030 maybe_warn_unused_local_typedefs ();
9032 /* Store the end of the function, so that we get good line number
9033 info for the epilogue. */
9034 cfun
->function_end_locus
= input_location
;
9036 /* Finalize the ELF visibility for the function. */
9037 c_determine_visibility (fndecl
);
9039 /* For GNU C extern inline functions disregard inline limits. */
9040 if (DECL_EXTERNAL (fndecl
)
9041 && DECL_DECLARED_INLINE_P (fndecl
))
9042 DECL_DISREGARD_INLINE_LIMITS (fndecl
) = 1;
9044 /* Genericize before inlining. Delay genericizing nested functions
9045 until their parent function is genericized. Since finalizing
9046 requires GENERIC, delay that as well. */
9048 if (DECL_INITIAL (fndecl
) && DECL_INITIAL (fndecl
) != error_mark_node
9049 && !undef_nested_function
)
9051 if (!decl_function_context (fndecl
))
9053 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE
, fndecl
);
9054 c_genericize (fndecl
);
9056 /* ??? Objc emits functions after finalizing the compilation unit.
9057 This should be cleaned up later and this conditional removed. */
9058 if (symtab
->global_info_ready
)
9060 cgraph_node::add_new_function (fndecl
, false);
9063 cgraph_node::finalize_function (fndecl
, false);
9067 /* Register this function with cgraph just far enough to get it
9068 added to our parent's nested function list. Handy, since the
9069 C front end doesn't have such a list. */
9070 (void) cgraph_node::get_create (fndecl
);
9074 if (!decl_function_context (fndecl
))
9075 undef_nested_function
= false;
9077 if (cfun
->language
!= NULL
)
9079 ggc_free (cfun
->language
);
9080 cfun
->language
= NULL
;
9083 /* We're leaving the context of this function, so zap cfun.
9084 It's still in DECL_STRUCT_FUNCTION, and we'll restore it in
9085 tree_rest_of_compilation. */
9087 invoke_plugin_callbacks (PLUGIN_FINISH_PARSE_FUNCTION
, current_function_decl
);
9088 current_function_decl
= NULL
;
9091 /* Check the declarations given in a for-loop for satisfying the C99
9092 constraints. If exactly one such decl is found, return it. LOC is
9093 the location of the opening parenthesis of the for loop. The last
9094 parameter allows you to control the "for loop initial declarations
9095 are only allowed in C99 mode". Normally, you should pass
9096 flag_isoc99 as that parameter. But in some cases (Objective-C
9097 foreach loop, for example) we want to run the checks in this
9098 function even if not in C99 mode, so we allow the caller to turn
9099 off the error about not being in C99 mode.
9103 check_for_loop_decls (location_t loc
, bool turn_off_iso_c99_error
)
9105 struct c_binding
*b
;
9106 tree one_decl
= NULL_TREE
;
9109 if (!turn_off_iso_c99_error
)
9111 static bool hint
= true;
9112 /* If we get here, declarations have been used in a for loop without
9113 the C99 for loop scope. This doesn't make much sense, so don't
9115 error_at (loc
, "%<for%> loop initial declarations "
9116 "are only allowed in C99 or C11 mode");
9120 "use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 "
9121 "to compile your code");
9126 /* C99 subclause 6.8.5 paragraph 3:
9128 [#3] The declaration part of a for statement shall only
9129 declare identifiers for objects having storage class auto or
9132 It isn't clear whether, in this sentence, "identifiers" binds to
9133 "shall only declare" or to "objects" - that is, whether all identifiers
9134 declared must be identifiers for objects, or whether the restriction
9135 only applies to those that are. (A question on this in comp.std.c
9136 in November 2000 received no answer.) We implement the strictest
9137 interpretation, to avoid creating an extension which later causes
9140 for (b
= current_scope
->bindings
; b
; b
= b
->prev
)
9143 tree decl
= b
->decl
;
9148 switch (TREE_CODE (decl
))
9152 location_t decl_loc
= DECL_SOURCE_LOCATION (decl
);
9153 if (TREE_STATIC (decl
))
9155 "declaration of static variable %qD in %<for%> loop "
9156 "initial declaration", decl
);
9157 else if (DECL_EXTERNAL (decl
))
9159 "declaration of %<extern%> variable %qD in %<for%> loop "
9160 "initial declaration", decl
);
9166 "%<struct %E%> declared in %<for%> loop initial "
9171 "%<union %E%> declared in %<for%> loop initial declaration",
9175 error_at (loc
, "%<enum %E%> declared in %<for%> loop "
9176 "initial declaration", id
);
9179 error_at (loc
, "declaration of non-variable "
9180 "%qD in %<for%> loop initial declaration", decl
);
9187 return n_decls
== 1 ? one_decl
: NULL_TREE
;
9190 /* Save and reinitialize the variables
9191 used during compilation of a C function. */
9194 c_push_function_context (void)
9196 struct language_function
*p
= cfun
->language
;
9197 /* cfun->language might have been already allocated by the use of
9198 -Wunused-local-typedefs. In that case, just re-use it. */
9200 cfun
->language
= p
= ggc_cleared_alloc
<language_function
> ();
9202 p
->base
.x_stmt_tree
= c_stmt_tree
;
9203 c_stmt_tree
.x_cur_stmt_list
= vec_safe_copy (c_stmt_tree
.x_cur_stmt_list
);
9204 p
->x_break_label
= c_break_label
;
9205 p
->x_cont_label
= c_cont_label
;
9206 p
->x_switch_stack
= c_switch_stack
;
9207 p
->arg_info
= current_function_arg_info
;
9208 p
->returns_value
= current_function_returns_value
;
9209 p
->returns_null
= current_function_returns_null
;
9210 p
->returns_abnormally
= current_function_returns_abnormally
;
9211 p
->warn_about_return_type
= warn_about_return_type
;
9213 push_function_context ();
9216 /* Restore the variables used during compilation of a C function. */
9219 c_pop_function_context (void)
9221 struct language_function
*p
;
9223 pop_function_context ();
9226 /* When -Wunused-local-typedefs is in effect, cfun->languages is
9227 used to store data throughout the life time of the current cfun,
9228 So don't deallocate it. */
9229 if (!warn_unused_local_typedefs
)
9230 cfun
->language
= NULL
;
9232 if (DECL_STRUCT_FUNCTION (current_function_decl
) == 0
9233 && DECL_SAVED_TREE (current_function_decl
) == NULL_TREE
)
9235 /* Stop pointing to the local nodes about to be freed. */
9236 /* But DECL_INITIAL must remain nonzero so we know this
9237 was an actual function definition. */
9238 DECL_INITIAL (current_function_decl
) = error_mark_node
;
9239 DECL_ARGUMENTS (current_function_decl
) = 0;
9242 c_stmt_tree
= p
->base
.x_stmt_tree
;
9243 p
->base
.x_stmt_tree
.x_cur_stmt_list
= NULL
;
9244 c_break_label
= p
->x_break_label
;
9245 c_cont_label
= p
->x_cont_label
;
9246 c_switch_stack
= p
->x_switch_stack
;
9247 current_function_arg_info
= p
->arg_info
;
9248 current_function_returns_value
= p
->returns_value
;
9249 current_function_returns_null
= p
->returns_null
;
9250 current_function_returns_abnormally
= p
->returns_abnormally
;
9251 warn_about_return_type
= p
->warn_about_return_type
;
9254 /* The functions below are required for functionality of doing
9255 function at once processing in the C front end. Currently these
9256 functions are not called from anywhere in the C front end, but as
9257 these changes continue, that will change. */
9259 /* Returns the stmt_tree (if any) to which statements are currently
9260 being added. If there is no active statement-tree, NULL is
9264 current_stmt_tree (void)
9266 return &c_stmt_tree
;
9269 /* Return the global value of T as a symbol. */
9272 identifier_global_value (tree t
)
9274 struct c_binding
*b
;
9276 for (b
= I_SYMBOL_BINDING (t
); b
; b
= b
->shadowed
)
9277 if (B_IN_FILE_SCOPE (b
) || B_IN_EXTERNAL_SCOPE (b
))
9283 /* In C, the only C-linkage public declaration is at file scope. */
9286 c_linkage_bindings (tree name
)
9288 return identifier_global_value (name
);
9291 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
9292 otherwise the name is found in ridpointers from RID_INDEX. */
9295 record_builtin_type (enum rid rid_index
, const char *name
, tree type
)
9299 id
= ridpointers
[(int) rid_index
];
9301 id
= get_identifier (name
);
9302 decl
= build_decl (UNKNOWN_LOCATION
, TYPE_DECL
, id
, type
);
9304 if (debug_hooks
->type_decl
)
9305 debug_hooks
->type_decl (decl
, false);
9308 /* Build the void_list_node (void_type_node having been created). */
9310 build_void_list_node (void)
9312 tree t
= build_tree_list (NULL_TREE
, void_type_node
);
9316 /* Return a c_parm structure with the given SPECS, ATTRS and DECLARATOR. */
9319 build_c_parm (struct c_declspecs
*specs
, tree attrs
,
9320 struct c_declarator
*declarator
)
9322 struct c_parm
*ret
= XOBNEW (&parser_obstack
, struct c_parm
);
9325 ret
->declarator
= declarator
;
9329 /* Return a declarator with nested attributes. TARGET is the inner
9330 declarator to which these attributes apply. ATTRS are the
9333 struct c_declarator
*
9334 build_attrs_declarator (tree attrs
, struct c_declarator
*target
)
9336 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
9337 ret
->kind
= cdk_attrs
;
9338 ret
->declarator
= target
;
9339 ret
->u
.attrs
= attrs
;
9343 /* Return a declarator for a function with arguments specified by ARGS
9344 and return type specified by TARGET. */
9346 struct c_declarator
*
9347 build_function_declarator (struct c_arg_info
*args
,
9348 struct c_declarator
*target
)
9350 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
9351 ret
->kind
= cdk_function
;
9352 ret
->declarator
= target
;
9353 ret
->u
.arg_info
= args
;
9357 /* Return a declarator for the identifier IDENT (which may be
9358 NULL_TREE for an abstract declarator). */
9360 struct c_declarator
*
9361 build_id_declarator (tree ident
)
9363 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
9365 ret
->declarator
= 0;
9367 /* Default value - may get reset to a more precise location. */
9368 ret
->id_loc
= input_location
;
9372 /* Return something to represent absolute declarators containing a *.
9373 TARGET is the absolute declarator that the * contains.
9374 TYPE_QUALS_ATTRS is a structure for type qualifiers and attributes
9375 to apply to the pointer type. */
9377 struct c_declarator
*
9378 make_pointer_declarator (struct c_declspecs
*type_quals_attrs
,
9379 struct c_declarator
*target
)
9383 struct c_declarator
*itarget
= target
;
9384 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
9385 if (type_quals_attrs
)
9387 attrs
= type_quals_attrs
->attrs
;
9388 quals
= quals_from_declspecs (type_quals_attrs
);
9389 if (attrs
!= NULL_TREE
)
9390 itarget
= build_attrs_declarator (attrs
, target
);
9392 ret
->kind
= cdk_pointer
;
9393 ret
->declarator
= itarget
;
9394 ret
->u
.pointer_quals
= quals
;
9398 /* Return a pointer to a structure for an empty list of declaration
9401 struct c_declspecs
*
9402 build_null_declspecs (void)
9404 struct c_declspecs
*ret
= XOBNEW (&parser_obstack
, struct c_declspecs
);
9405 memset (&ret
->locations
, 0, cdw_number_of_elements
);
9410 ret
->align_log
= -1;
9411 ret
->typespec_word
= cts_none
;
9412 ret
->storage_class
= csc_none
;
9413 ret
->expr_const_operands
= true;
9414 ret
->declspecs_seen_p
= false;
9415 ret
->typespec_kind
= ctsk_none
;
9416 ret
->non_sc_seen_p
= false;
9417 ret
->typedef_p
= false;
9418 ret
->explicit_signed_p
= false;
9419 ret
->deprecated_p
= false;
9420 ret
->default_int_p
= false;
9421 ret
->long_p
= false;
9422 ret
->long_long_p
= false;
9423 ret
->short_p
= false;
9424 ret
->signed_p
= false;
9425 ret
->unsigned_p
= false;
9426 ret
->complex_p
= false;
9427 ret
->inline_p
= false;
9428 ret
->noreturn_p
= false;
9429 ret
->thread_p
= false;
9430 ret
->thread_gnu_p
= false;
9431 ret
->const_p
= false;
9432 ret
->volatile_p
= false;
9433 ret
->atomic_p
= false;
9434 ret
->restrict_p
= false;
9435 ret
->saturating_p
= false;
9436 ret
->alignas_p
= false;
9437 ret
->address_space
= ADDR_SPACE_GENERIC
;
9441 /* Add the address space ADDRSPACE to the declaration specifiers
9442 SPECS, returning SPECS. */
9444 struct c_declspecs
*
9445 declspecs_add_addrspace (source_location location
,
9446 struct c_declspecs
*specs
, addr_space_t as
)
9448 specs
->non_sc_seen_p
= true;
9449 specs
->declspecs_seen_p
= true;
9451 if (!ADDR_SPACE_GENERIC_P (specs
->address_space
)
9452 && specs
->address_space
!= as
)
9453 error ("incompatible address space qualifiers %qs and %qs",
9454 c_addr_space_name (as
),
9455 c_addr_space_name (specs
->address_space
));
9458 specs
->address_space
= as
;
9459 specs
->locations
[cdw_address_space
] = location
;
9464 /* Add the type qualifier QUAL to the declaration specifiers SPECS,
9467 struct c_declspecs
*
9468 declspecs_add_qual (source_location loc
,
9469 struct c_declspecs
*specs
, tree qual
)
9473 specs
->non_sc_seen_p
= true;
9474 specs
->declspecs_seen_p
= true;
9475 gcc_assert (TREE_CODE (qual
) == IDENTIFIER_NODE
9476 && C_IS_RESERVED_WORD (qual
));
9477 i
= C_RID_CODE (qual
);
9481 dupe
= specs
->const_p
;
9482 specs
->const_p
= true;
9483 specs
->locations
[cdw_const
] = loc
;
9486 dupe
= specs
->volatile_p
;
9487 specs
->volatile_p
= true;
9488 specs
->locations
[cdw_volatile
] = loc
;
9491 dupe
= specs
->restrict_p
;
9492 specs
->restrict_p
= true;
9493 specs
->locations
[cdw_restrict
] = loc
;
9496 dupe
= specs
->atomic_p
;
9497 specs
->atomic_p
= true;
9503 pedwarn_c90 (loc
, OPT_Wpedantic
, "duplicate %qE", qual
);
9507 /* Add the type specifier TYPE to the declaration specifiers SPECS,
9510 struct c_declspecs
*
9511 declspecs_add_type (location_t loc
, struct c_declspecs
*specs
,
9512 struct c_typespec spec
)
9514 tree type
= spec
.spec
;
9515 specs
->non_sc_seen_p
= true;
9516 specs
->declspecs_seen_p
= true;
9517 specs
->typespec_kind
= spec
.kind
;
9518 if (TREE_DEPRECATED (type
))
9519 specs
->deprecated_p
= true;
9521 /* Handle type specifier keywords. */
9522 if (TREE_CODE (type
) == IDENTIFIER_NODE
9523 && C_IS_RESERVED_WORD (type
)
9524 && C_RID_CODE (type
) != RID_CXX_COMPAT_WARN
)
9526 enum rid i
= C_RID_CODE (type
);
9529 error_at (loc
, "two or more data types in declaration specifiers");
9532 if ((int) i
<= (int) RID_LAST_MODIFIER
)
9534 /* "long", "short", "signed", "unsigned", "_Complex" or "_Sat". */
9539 if (specs
->long_long_p
)
9541 error_at (loc
, "%<long long long%> is too long for GCC");
9546 if (specs
->typespec_word
== cts_double
)
9549 ("both %<long long%> and %<double%> in "
9550 "declaration specifiers"));
9553 pedwarn_c90 (loc
, OPT_Wlong_long
,
9554 "ISO C90 does not support %<long long%>");
9555 specs
->long_long_p
= 1;
9556 specs
->locations
[cdw_long_long
] = loc
;
9561 ("both %<long%> and %<short%> in "
9562 "declaration specifiers"));
9563 else if (specs
->typespec_word
== cts_auto_type
)
9565 ("both %<long%> and %<__auto_type%> in "
9566 "declaration specifiers"));
9567 else if (specs
->typespec_word
== cts_void
)
9569 ("both %<long%> and %<void%> in "
9570 "declaration specifiers"));
9571 else if (specs
->typespec_word
== cts_int_n
)
9573 ("both %<long%> and %<__int%d%> in "
9574 "declaration specifiers"),
9575 int_n_data
[specs
->int_n_idx
].bitsize
);
9576 else if (specs
->typespec_word
== cts_bool
)
9578 ("both %<long%> and %<_Bool%> in "
9579 "declaration specifiers"));
9580 else if (specs
->typespec_word
== cts_char
)
9582 ("both %<long%> and %<char%> in "
9583 "declaration specifiers"));
9584 else if (specs
->typespec_word
== cts_float
)
9586 ("both %<long%> and %<float%> in "
9587 "declaration specifiers"));
9588 else if (specs
->typespec_word
== cts_dfloat32
)
9590 ("both %<long%> and %<_Decimal32%> in "
9591 "declaration specifiers"));
9592 else if (specs
->typespec_word
== cts_dfloat64
)
9594 ("both %<long%> and %<_Decimal64%> in "
9595 "declaration specifiers"));
9596 else if (specs
->typespec_word
== cts_dfloat128
)
9598 ("both %<long%> and %<_Decimal128%> in "
9599 "declaration specifiers"));
9602 specs
->long_p
= true;
9603 specs
->locations
[cdw_long
] = loc
;
9607 dupe
= specs
->short_p
;
9610 ("both %<long%> and %<short%> in "
9611 "declaration specifiers"));
9612 else if (specs
->typespec_word
== cts_auto_type
)
9614 ("both %<short%> and %<__auto_type%> in "
9615 "declaration specifiers"));
9616 else if (specs
->typespec_word
== cts_void
)
9618 ("both %<short%> and %<void%> in "
9619 "declaration specifiers"));
9620 else if (specs
->typespec_word
== cts_int_n
)
9622 ("both %<short%> and %<__int%d%> in "
9623 "declaration specifiers"),
9624 int_n_data
[specs
->int_n_idx
].bitsize
);
9625 else if (specs
->typespec_word
== cts_bool
)
9627 ("both %<short%> and %<_Bool%> in "
9628 "declaration specifiers"));
9629 else if (specs
->typespec_word
== cts_char
)
9631 ("both %<short%> and %<char%> in "
9632 "declaration specifiers"));
9633 else if (specs
->typespec_word
== cts_float
)
9635 ("both %<short%> and %<float%> in "
9636 "declaration specifiers"));
9637 else if (specs
->typespec_word
== cts_double
)
9639 ("both %<short%> and %<double%> in "
9640 "declaration specifiers"));
9641 else if (specs
->typespec_word
== cts_dfloat32
)
9643 ("both %<short%> and %<_Decimal32%> in "
9644 "declaration specifiers"));
9645 else if (specs
->typespec_word
== cts_dfloat64
)
9647 ("both %<short%> and %<_Decimal64%> in "
9648 "declaration specifiers"));
9649 else if (specs
->typespec_word
== cts_dfloat128
)
9651 ("both %<short%> and %<_Decimal128%> in "
9652 "declaration specifiers"));
9655 specs
->short_p
= true;
9656 specs
->locations
[cdw_short
] = loc
;
9660 dupe
= specs
->signed_p
;
9661 if (specs
->unsigned_p
)
9663 ("both %<signed%> and %<unsigned%> in "
9664 "declaration specifiers"));
9665 else if (specs
->typespec_word
== cts_auto_type
)
9667 ("both %<signed%> and %<__auto_type%> in "
9668 "declaration specifiers"));
9669 else if (specs
->typespec_word
== cts_void
)
9671 ("both %<signed%> and %<void%> in "
9672 "declaration specifiers"));
9673 else if (specs
->typespec_word
== cts_bool
)
9675 ("both %<signed%> and %<_Bool%> in "
9676 "declaration specifiers"));
9677 else if (specs
->typespec_word
== cts_float
)
9679 ("both %<signed%> and %<float%> in "
9680 "declaration specifiers"));
9681 else if (specs
->typespec_word
== cts_double
)
9683 ("both %<signed%> and %<double%> in "
9684 "declaration specifiers"));
9685 else if (specs
->typespec_word
== cts_dfloat32
)
9687 ("both %<signed%> and %<_Decimal32%> in "
9688 "declaration specifiers"));
9689 else if (specs
->typespec_word
== cts_dfloat64
)
9691 ("both %<signed%> and %<_Decimal64%> in "
9692 "declaration specifiers"));
9693 else if (specs
->typespec_word
== cts_dfloat128
)
9695 ("both %<signed%> and %<_Decimal128%> in "
9696 "declaration specifiers"));
9699 specs
->signed_p
= true;
9700 specs
->locations
[cdw_signed
] = loc
;
9704 dupe
= specs
->unsigned_p
;
9705 if (specs
->signed_p
)
9707 ("both %<signed%> and %<unsigned%> in "
9708 "declaration specifiers"));
9709 else if (specs
->typespec_word
== cts_auto_type
)
9711 ("both %<unsigned%> and %<__auto_type%> in "
9712 "declaration specifiers"));
9713 else if (specs
->typespec_word
== cts_void
)
9715 ("both %<unsigned%> and %<void%> in "
9716 "declaration specifiers"));
9717 else if (specs
->typespec_word
== cts_bool
)
9719 ("both %<unsigned%> and %<_Bool%> in "
9720 "declaration specifiers"));
9721 else if (specs
->typespec_word
== cts_float
)
9723 ("both %<unsigned%> and %<float%> in "
9724 "declaration specifiers"));
9725 else if (specs
->typespec_word
== cts_double
)
9727 ("both %<unsigned%> and %<double%> in "
9728 "declaration specifiers"));
9729 else if (specs
->typespec_word
== cts_dfloat32
)
9731 ("both %<unsigned%> and %<_Decimal32%> in "
9732 "declaration specifiers"));
9733 else if (specs
->typespec_word
== cts_dfloat64
)
9735 ("both %<unsigned%> and %<_Decimal64%> in "
9736 "declaration specifiers"));
9737 else if (specs
->typespec_word
== cts_dfloat128
)
9739 ("both %<unsigned%> and %<_Decimal128%> in "
9740 "declaration specifiers"));
9743 specs
->unsigned_p
= true;
9744 specs
->locations
[cdw_unsigned
] = loc
;
9748 dupe
= specs
->complex_p
;
9749 if (!in_system_header_at (loc
))
9750 pedwarn_c90 (loc
, OPT_Wpedantic
,
9751 "ISO C90 does not support complex types");
9752 if (specs
->typespec_word
== cts_auto_type
)
9754 ("both %<complex%> and %<__auto_type%> in "
9755 "declaration specifiers"));
9756 else if (specs
->typespec_word
== cts_void
)
9758 ("both %<complex%> and %<void%> in "
9759 "declaration specifiers"));
9760 else if (specs
->typespec_word
== cts_bool
)
9762 ("both %<complex%> and %<_Bool%> in "
9763 "declaration specifiers"));
9764 else if (specs
->typespec_word
== cts_dfloat32
)
9766 ("both %<complex%> and %<_Decimal32%> in "
9767 "declaration specifiers"));
9768 else if (specs
->typespec_word
== cts_dfloat64
)
9770 ("both %<complex%> and %<_Decimal64%> in "
9771 "declaration specifiers"));
9772 else if (specs
->typespec_word
== cts_dfloat128
)
9774 ("both %<complex%> and %<_Decimal128%> in "
9775 "declaration specifiers"));
9776 else if (specs
->typespec_word
== cts_fract
)
9778 ("both %<complex%> and %<_Fract%> in "
9779 "declaration specifiers"));
9780 else if (specs
->typespec_word
== cts_accum
)
9782 ("both %<complex%> and %<_Accum%> in "
9783 "declaration specifiers"));
9784 else if (specs
->saturating_p
)
9786 ("both %<complex%> and %<_Sat%> in "
9787 "declaration specifiers"));
9790 specs
->complex_p
= true;
9791 specs
->locations
[cdw_complex
] = loc
;
9795 dupe
= specs
->saturating_p
;
9796 pedwarn (loc
, OPT_Wpedantic
,
9797 "ISO C does not support saturating types");
9798 if (specs
->typespec_word
== cts_int_n
)
9801 ("both %<_Sat%> and %<__int%d%> in "
9802 "declaration specifiers"),
9803 int_n_data
[specs
->int_n_idx
].bitsize
);
9805 else if (specs
->typespec_word
== cts_auto_type
)
9807 ("both %<_Sat%> and %<__auto_type%> in "
9808 "declaration specifiers"));
9809 else if (specs
->typespec_word
== cts_void
)
9811 ("both %<_Sat%> and %<void%> in "
9812 "declaration specifiers"));
9813 else if (specs
->typespec_word
== cts_bool
)
9815 ("both %<_Sat%> and %<_Bool%> in "
9816 "declaration specifiers"));
9817 else if (specs
->typespec_word
== cts_char
)
9819 ("both %<_Sat%> and %<char%> in "
9820 "declaration specifiers"));
9821 else if (specs
->typespec_word
== cts_int
)
9823 ("both %<_Sat%> and %<int%> in "
9824 "declaration specifiers"));
9825 else if (specs
->typespec_word
== cts_float
)
9827 ("both %<_Sat%> and %<float%> in "
9828 "declaration specifiers"));
9829 else if (specs
->typespec_word
== cts_double
)
9831 ("both %<_Sat%> and %<double%> in "
9832 "declaration specifiers"));
9833 else if (specs
->typespec_word
== cts_dfloat32
)
9835 ("both %<_Sat%> and %<_Decimal32%> in "
9836 "declaration specifiers"));
9837 else if (specs
->typespec_word
== cts_dfloat64
)
9839 ("both %<_Sat%> and %<_Decimal64%> in "
9840 "declaration specifiers"));
9841 else if (specs
->typespec_word
== cts_dfloat128
)
9843 ("both %<_Sat%> and %<_Decimal128%> in "
9844 "declaration specifiers"));
9845 else if (specs
->complex_p
)
9847 ("both %<_Sat%> and %<complex%> in "
9848 "declaration specifiers"));
9851 specs
->saturating_p
= true;
9852 specs
->locations
[cdw_saturating
] = loc
;
9860 error_at (loc
, "duplicate %qE", type
);
9866 /* "void", "_Bool", "char", "int", "float", "double", "_Decimal32",
9867 "__intN", "_Decimal64", "_Decimal128", "_Fract", "_Accum" or
9869 if (specs
->typespec_word
!= cts_none
)
9872 "two or more data types in declaration specifiers");
9880 ("both %<long%> and %<__auto_type%> in "
9881 "declaration specifiers"));
9882 else if (specs
->short_p
)
9884 ("both %<short%> and %<__auto_type%> in "
9885 "declaration specifiers"));
9886 else if (specs
->signed_p
)
9888 ("both %<signed%> and %<__auto_type%> in "
9889 "declaration specifiers"));
9890 else if (specs
->unsigned_p
)
9892 ("both %<unsigned%> and %<__auto_type%> in "
9893 "declaration specifiers"));
9894 else if (specs
->complex_p
)
9896 ("both %<complex%> and %<__auto_type%> in "
9897 "declaration specifiers"));
9898 else if (specs
->saturating_p
)
9900 ("both %<_Sat%> and %<__auto_type%> in "
9901 "declaration specifiers"));
9904 specs
->typespec_word
= cts_auto_type
;
9905 specs
->locations
[cdw_typespec
] = loc
;
9912 specs
->int_n_idx
= i
- RID_INT_N_0
;
9913 if (!in_system_header_at (input_location
))
9914 pedwarn (loc
, OPT_Wpedantic
,
9915 "ISO C does not support %<__int%d%> types",
9916 int_n_data
[specs
->int_n_idx
].bitsize
);
9920 ("both %<__int%d%> and %<long%> in "
9921 "declaration specifiers"),
9922 int_n_data
[specs
->int_n_idx
].bitsize
);
9923 else if (specs
->saturating_p
)
9925 ("both %<_Sat%> and %<__int%d%> in "
9926 "declaration specifiers"),
9927 int_n_data
[specs
->int_n_idx
].bitsize
);
9928 else if (specs
->short_p
)
9930 ("both %<__int%d%> and %<short%> in "
9931 "declaration specifiers"),
9932 int_n_data
[specs
->int_n_idx
].bitsize
);
9933 else if (! int_n_enabled_p
[specs
->int_n_idx
])
9935 "%<__int%d%> is not supported on this target",
9936 int_n_data
[specs
->int_n_idx
].bitsize
);
9939 specs
->typespec_word
= cts_int_n
;
9940 specs
->locations
[cdw_typespec
] = loc
;
9946 ("both %<long%> and %<void%> in "
9947 "declaration specifiers"));
9948 else if (specs
->short_p
)
9950 ("both %<short%> and %<void%> in "
9951 "declaration specifiers"));
9952 else if (specs
->signed_p
)
9954 ("both %<signed%> and %<void%> in "
9955 "declaration specifiers"));
9956 else if (specs
->unsigned_p
)
9958 ("both %<unsigned%> and %<void%> in "
9959 "declaration specifiers"));
9960 else if (specs
->complex_p
)
9962 ("both %<complex%> and %<void%> in "
9963 "declaration specifiers"));
9964 else if (specs
->saturating_p
)
9966 ("both %<_Sat%> and %<void%> in "
9967 "declaration specifiers"));
9970 specs
->typespec_word
= cts_void
;
9971 specs
->locations
[cdw_typespec
] = loc
;
9975 if (!in_system_header_at (loc
))
9976 pedwarn_c90 (loc
, OPT_Wpedantic
,
9977 "ISO C90 does not support boolean types");
9980 ("both %<long%> and %<_Bool%> in "
9981 "declaration specifiers"));
9982 else if (specs
->short_p
)
9984 ("both %<short%> and %<_Bool%> in "
9985 "declaration specifiers"));
9986 else if (specs
->signed_p
)
9988 ("both %<signed%> and %<_Bool%> in "
9989 "declaration specifiers"));
9990 else if (specs
->unsigned_p
)
9992 ("both %<unsigned%> and %<_Bool%> in "
9993 "declaration specifiers"));
9994 else if (specs
->complex_p
)
9996 ("both %<complex%> and %<_Bool%> in "
9997 "declaration specifiers"));
9998 else if (specs
->saturating_p
)
10000 ("both %<_Sat%> and %<_Bool%> in "
10001 "declaration specifiers"));
10004 specs
->typespec_word
= cts_bool
;
10005 specs
->locations
[cdw_typespec
] = loc
;
10011 ("both %<long%> and %<char%> in "
10012 "declaration specifiers"));
10013 else if (specs
->short_p
)
10015 ("both %<short%> and %<char%> in "
10016 "declaration specifiers"));
10017 else if (specs
->saturating_p
)
10019 ("both %<_Sat%> and %<char%> in "
10020 "declaration specifiers"));
10023 specs
->typespec_word
= cts_char
;
10024 specs
->locations
[cdw_typespec
] = loc
;
10028 if (specs
->saturating_p
)
10030 ("both %<_Sat%> and %<int%> in "
10031 "declaration specifiers"));
10034 specs
->typespec_word
= cts_int
;
10035 specs
->locations
[cdw_typespec
] = loc
;
10041 ("both %<long%> and %<float%> in "
10042 "declaration specifiers"));
10043 else if (specs
->short_p
)
10045 ("both %<short%> and %<float%> in "
10046 "declaration specifiers"));
10047 else if (specs
->signed_p
)
10049 ("both %<signed%> and %<float%> in "
10050 "declaration specifiers"));
10051 else if (specs
->unsigned_p
)
10053 ("both %<unsigned%> and %<float%> in "
10054 "declaration specifiers"));
10055 else if (specs
->saturating_p
)
10057 ("both %<_Sat%> and %<float%> in "
10058 "declaration specifiers"));
10061 specs
->typespec_word
= cts_float
;
10062 specs
->locations
[cdw_typespec
] = loc
;
10066 if (specs
->long_long_p
)
10068 ("both %<long long%> and %<double%> in "
10069 "declaration specifiers"));
10070 else if (specs
->short_p
)
10072 ("both %<short%> and %<double%> in "
10073 "declaration specifiers"));
10074 else if (specs
->signed_p
)
10076 ("both %<signed%> and %<double%> in "
10077 "declaration specifiers"));
10078 else if (specs
->unsigned_p
)
10080 ("both %<unsigned%> and %<double%> in "
10081 "declaration specifiers"));
10082 else if (specs
->saturating_p
)
10084 ("both %<_Sat%> and %<double%> in "
10085 "declaration specifiers"));
10088 specs
->typespec_word
= cts_double
;
10089 specs
->locations
[cdw_typespec
] = loc
;
10094 case RID_DFLOAT128
:
10097 if (i
== RID_DFLOAT32
)
10098 str
= "_Decimal32";
10099 else if (i
== RID_DFLOAT64
)
10100 str
= "_Decimal64";
10102 str
= "_Decimal128";
10103 if (specs
->long_long_p
)
10105 ("both %<long long%> and %<%s%> in "
10106 "declaration specifiers"),
10110 ("both %<long%> and %<%s%> in "
10111 "declaration specifiers"),
10113 else if (specs
->short_p
)
10115 ("both %<short%> and %<%s%> in "
10116 "declaration specifiers"),
10118 else if (specs
->signed_p
)
10120 ("both %<signed%> and %<%s%> in "
10121 "declaration specifiers"),
10123 else if (specs
->unsigned_p
)
10125 ("both %<unsigned%> and %<%s%> in "
10126 "declaration specifiers"),
10128 else if (specs
->complex_p
)
10130 ("both %<complex%> and %<%s%> in "
10131 "declaration specifiers"),
10133 else if (specs
->saturating_p
)
10135 ("both %<_Sat%> and %<%s%> in "
10136 "declaration specifiers"),
10138 else if (i
== RID_DFLOAT32
)
10139 specs
->typespec_word
= cts_dfloat32
;
10140 else if (i
== RID_DFLOAT64
)
10141 specs
->typespec_word
= cts_dfloat64
;
10143 specs
->typespec_word
= cts_dfloat128
;
10144 specs
->locations
[cdw_typespec
] = loc
;
10146 if (!targetm
.decimal_float_supported_p ())
10148 ("decimal floating point not supported "
10149 "for this target"));
10150 pedwarn (loc
, OPT_Wpedantic
,
10151 "ISO C does not support decimal floating point");
10157 if (i
== RID_FRACT
)
10161 if (specs
->complex_p
)
10163 ("both %<complex%> and %<%s%> in "
10164 "declaration specifiers"),
10166 else if (i
== RID_FRACT
)
10167 specs
->typespec_word
= cts_fract
;
10169 specs
->typespec_word
= cts_accum
;
10170 specs
->locations
[cdw_typespec
] = loc
;
10172 if (!targetm
.fixed_point_supported_p ())
10174 "fixed-point types not supported for this target");
10175 pedwarn (loc
, OPT_Wpedantic
,
10176 "ISO C does not support fixed-point types");
10179 /* ObjC reserved word "id", handled below. */
10185 /* Now we have a typedef (a TYPE_DECL node), an identifier (some
10186 form of ObjC type, cases such as "int" and "long" being handled
10187 above), a TYPE (struct, union, enum and typeof specifiers) or an
10188 ERROR_MARK. In none of these cases may there have previously
10189 been any type specifiers. */
10190 if (specs
->type
|| specs
->typespec_word
!= cts_none
10191 || specs
->long_p
|| specs
->short_p
|| specs
->signed_p
10192 || specs
->unsigned_p
|| specs
->complex_p
)
10193 error_at (loc
, "two or more data types in declaration specifiers");
10194 else if (TREE_CODE (type
) == TYPE_DECL
)
10196 if (TREE_TYPE (type
) == error_mark_node
)
10197 ; /* Allow the type to default to int to avoid cascading errors. */
10200 specs
->type
= TREE_TYPE (type
);
10201 specs
->decl_attr
= DECL_ATTRIBUTES (type
);
10202 specs
->typedef_p
= true;
10203 specs
->explicit_signed_p
= C_TYPEDEF_EXPLICITLY_SIGNED (type
);
10204 specs
->locations
[cdw_typedef
] = loc
;
10206 /* If this typedef name is defined in a struct, then a C++
10207 lookup would return a different value. */
10208 if (warn_cxx_compat
10209 && I_SYMBOL_BINDING (DECL_NAME (type
))->in_struct
)
10210 warning_at (loc
, OPT_Wc___compat
,
10211 "C++ lookup of %qD would return a field, not a type",
10214 /* If we are parsing a struct, record that a struct field
10216 if (warn_cxx_compat
&& struct_parse_info
!= NULL
)
10217 struct_parse_info
->typedefs_seen
.safe_push (type
);
10220 else if (TREE_CODE (type
) == IDENTIFIER_NODE
)
10222 tree t
= lookup_name (type
);
10223 if (!t
|| TREE_CODE (t
) != TYPE_DECL
)
10224 error_at (loc
, "%qE fails to be a typedef or built in type", type
);
10225 else if (TREE_TYPE (t
) == error_mark_node
)
10229 specs
->type
= TREE_TYPE (t
);
10230 specs
->locations
[cdw_typespec
] = loc
;
10235 if (TREE_CODE (type
) != ERROR_MARK
&& spec
.kind
== ctsk_typeof
)
10237 specs
->typedef_p
= true;
10238 specs
->locations
[cdw_typedef
] = loc
;
10242 specs
->expr
= build2 (COMPOUND_EXPR
, TREE_TYPE (spec
.expr
),
10243 specs
->expr
, spec
.expr
);
10245 specs
->expr
= spec
.expr
;
10246 specs
->expr_const_operands
&= spec
.expr_const_operands
;
10249 specs
->type
= type
;
10255 /* Add the storage class specifier or function specifier SCSPEC to the
10256 declaration specifiers SPECS, returning SPECS. */
10258 struct c_declspecs
*
10259 declspecs_add_scspec (source_location loc
,
10260 struct c_declspecs
*specs
,
10264 enum c_storage_class n
= csc_none
;
10266 specs
->declspecs_seen_p
= true;
10267 gcc_assert (TREE_CODE (scspec
) == IDENTIFIER_NODE
10268 && C_IS_RESERVED_WORD (scspec
));
10269 i
= C_RID_CODE (scspec
);
10270 if (specs
->non_sc_seen_p
)
10271 warning (OPT_Wold_style_declaration
,
10272 "%qE is not at beginning of declaration", scspec
);
10276 /* C99 permits duplicate inline. Although of doubtful utility,
10277 it seems simplest to permit it in gnu89 mode as well, as
10278 there is also little utility in maintaining this as a
10279 difference between gnu89 and C99 inline. */
10281 specs
->inline_p
= true;
10282 specs
->locations
[cdw_inline
] = loc
;
10285 /* Duplicate _Noreturn is permitted. */
10287 specs
->noreturn_p
= true;
10288 specs
->locations
[cdw_noreturn
] = loc
;
10291 dupe
= specs
->thread_p
;
10292 if (specs
->storage_class
== csc_auto
)
10293 error ("%qE used with %<auto%>", scspec
);
10294 else if (specs
->storage_class
== csc_register
)
10295 error ("%qE used with %<register%>", scspec
);
10296 else if (specs
->storage_class
== csc_typedef
)
10297 error ("%qE used with %<typedef%>", scspec
);
10300 specs
->thread_p
= true;
10301 specs
->thread_gnu_p
= (strcmp (IDENTIFIER_POINTER (scspec
),
10303 /* A diagnostic is not required for the use of this
10304 identifier in the implementation namespace; only diagnose
10305 it for the C11 spelling because of existing code using
10306 the other spelling. */
10307 if (!specs
->thread_gnu_p
)
10310 pedwarn_c99 (loc
, OPT_Wpedantic
,
10311 "ISO C99 does not support %qE", scspec
);
10313 pedwarn_c99 (loc
, OPT_Wpedantic
,
10314 "ISO C90 does not support %qE", scspec
);
10316 specs
->locations
[cdw_thread
] = loc
;
10324 /* Diagnose "__thread extern". */
10325 if (specs
->thread_p
&& specs
->thread_gnu_p
)
10326 error ("%<__thread%> before %<extern%>");
10333 /* Diagnose "__thread static". */
10334 if (specs
->thread_p
&& specs
->thread_gnu_p
)
10335 error ("%<__thread%> before %<static%>");
10341 gcc_unreachable ();
10343 if (n
!= csc_none
&& n
== specs
->storage_class
)
10347 if (i
== RID_THREAD
)
10348 error ("duplicate %<_Thread_local%> or %<__thread%>");
10350 error ("duplicate %qE", scspec
);
10354 if (specs
->storage_class
!= csc_none
&& n
!= specs
->storage_class
)
10356 error ("multiple storage classes in declaration specifiers");
10360 specs
->storage_class
= n
;
10361 specs
->locations
[cdw_storage_class
] = loc
;
10362 if (n
!= csc_extern
&& n
!= csc_static
&& specs
->thread_p
)
10364 error ("%qs used with %qE",
10365 specs
->thread_gnu_p
? "__thread" : "_Thread_local",
10367 specs
->thread_p
= false;
10374 /* Add the attributes ATTRS to the declaration specifiers SPECS,
10375 returning SPECS. */
10377 struct c_declspecs
*
10378 declspecs_add_attrs (source_location loc
, struct c_declspecs
*specs
, tree attrs
)
10380 specs
->attrs
= chainon (attrs
, specs
->attrs
);
10381 specs
->locations
[cdw_attributes
] = loc
;
10382 specs
->declspecs_seen_p
= true;
10386 /* Add an _Alignas specifier (expression ALIGN, or type whose
10387 alignment is ALIGN) to the declaration specifiers SPECS, returning
10389 struct c_declspecs
*
10390 declspecs_add_alignas (source_location loc
,
10391 struct c_declspecs
*specs
, tree align
)
10394 specs
->alignas_p
= true;
10395 specs
->locations
[cdw_alignas
] = loc
;
10396 if (align
== error_mark_node
)
10398 align_log
= check_user_alignment (align
, true);
10399 if (align_log
> specs
->align_log
)
10400 specs
->align_log
= align_log
;
10404 /* Combine "long", "short", "signed", "unsigned" and "_Complex" type
10405 specifiers with any other type specifier to determine the resulting
10406 type. This is where ISO C checks on complex types are made, since
10407 "_Complex long" is a prefix of the valid ISO C type "_Complex long
10410 struct c_declspecs
*
10411 finish_declspecs (struct c_declspecs
*specs
)
10413 /* If a type was specified as a whole, we have no modifiers and are
10415 if (specs
->type
!= NULL_TREE
)
10417 gcc_assert (!specs
->long_p
&& !specs
->long_long_p
&& !specs
->short_p
10418 && !specs
->signed_p
&& !specs
->unsigned_p
10419 && !specs
->complex_p
);
10421 /* Set a dummy type. */
10422 if (TREE_CODE (specs
->type
) == ERROR_MARK
)
10423 specs
->type
= integer_type_node
;
10427 /* If none of "void", "_Bool", "char", "int", "float" or "double"
10428 has been specified, treat it as "int" unless "_Complex" is
10429 present and there are no other specifiers. If we just have
10430 "_Complex", it is equivalent to "_Complex double", but e.g.
10431 "_Complex short" is equivalent to "_Complex short int". */
10432 if (specs
->typespec_word
== cts_none
)
10434 if (specs
->saturating_p
)
10436 error_at (specs
->locations
[cdw_saturating
],
10437 "%<_Sat%> is used without %<_Fract%> or %<_Accum%>");
10438 if (!targetm
.fixed_point_supported_p ())
10439 error_at (specs
->locations
[cdw_saturating
],
10440 "fixed-point types not supported for this target");
10441 specs
->typespec_word
= cts_fract
;
10443 else if (specs
->long_p
|| specs
->short_p
10444 || specs
->signed_p
|| specs
->unsigned_p
)
10446 specs
->typespec_word
= cts_int
;
10448 else if (specs
->complex_p
)
10450 specs
->typespec_word
= cts_double
;
10451 pedwarn (specs
->locations
[cdw_complex
], OPT_Wpedantic
,
10452 "ISO C does not support plain %<complex%> meaning "
10453 "%<double complex%>");
10457 specs
->typespec_word
= cts_int
;
10458 specs
->default_int_p
= true;
10459 /* We don't diagnose this here because grokdeclarator will
10460 give more specific diagnostics according to whether it is
10461 a function definition. */
10465 /* If "signed" was specified, record this to distinguish "int" and
10466 "signed int" in the case of a bit-field with
10467 -funsigned-bitfields. */
10468 specs
->explicit_signed_p
= specs
->signed_p
;
10470 /* Now compute the actual type. */
10471 switch (specs
->typespec_word
)
10473 case cts_auto_type
:
10474 gcc_assert (!specs
->long_p
&& !specs
->short_p
10475 && !specs
->signed_p
&& !specs
->unsigned_p
10476 && !specs
->complex_p
);
10477 /* Type to be filled in later. */
10480 gcc_assert (!specs
->long_p
&& !specs
->short_p
10481 && !specs
->signed_p
&& !specs
->unsigned_p
10482 && !specs
->complex_p
);
10483 specs
->type
= void_type_node
;
10486 gcc_assert (!specs
->long_p
&& !specs
->short_p
10487 && !specs
->signed_p
&& !specs
->unsigned_p
10488 && !specs
->complex_p
);
10489 specs
->type
= boolean_type_node
;
10492 gcc_assert (!specs
->long_p
&& !specs
->short_p
);
10493 gcc_assert (!(specs
->signed_p
&& specs
->unsigned_p
));
10494 if (specs
->signed_p
)
10495 specs
->type
= signed_char_type_node
;
10496 else if (specs
->unsigned_p
)
10497 specs
->type
= unsigned_char_type_node
;
10499 specs
->type
= char_type_node
;
10500 if (specs
->complex_p
)
10502 pedwarn (specs
->locations
[cdw_complex
], OPT_Wpedantic
,
10503 "ISO C does not support complex integer types");
10504 specs
->type
= build_complex_type (specs
->type
);
10508 gcc_assert (!specs
->long_p
&& !specs
->short_p
&& !specs
->long_long_p
);
10509 gcc_assert (!(specs
->signed_p
&& specs
->unsigned_p
));
10510 specs
->type
= (specs
->unsigned_p
10511 ? int_n_trees
[specs
->int_n_idx
].unsigned_type
10512 : int_n_trees
[specs
->int_n_idx
].signed_type
);
10513 if (specs
->complex_p
)
10515 pedwarn (specs
->locations
[cdw_complex
], OPT_Wpedantic
,
10516 "ISO C does not support complex integer types");
10517 specs
->type
= build_complex_type (specs
->type
);
10521 gcc_assert (!(specs
->long_p
&& specs
->short_p
));
10522 gcc_assert (!(specs
->signed_p
&& specs
->unsigned_p
));
10523 if (specs
->long_long_p
)
10524 specs
->type
= (specs
->unsigned_p
10525 ? long_long_unsigned_type_node
10526 : long_long_integer_type_node
);
10527 else if (specs
->long_p
)
10528 specs
->type
= (specs
->unsigned_p
10529 ? long_unsigned_type_node
10530 : long_integer_type_node
);
10531 else if (specs
->short_p
)
10532 specs
->type
= (specs
->unsigned_p
10533 ? short_unsigned_type_node
10534 : short_integer_type_node
);
10536 specs
->type
= (specs
->unsigned_p
10537 ? unsigned_type_node
10538 : integer_type_node
);
10539 if (specs
->complex_p
)
10541 pedwarn (specs
->locations
[cdw_complex
], OPT_Wpedantic
,
10542 "ISO C does not support complex integer types");
10543 specs
->type
= build_complex_type (specs
->type
);
10547 gcc_assert (!specs
->long_p
&& !specs
->short_p
10548 && !specs
->signed_p
&& !specs
->unsigned_p
);
10549 specs
->type
= (specs
->complex_p
10550 ? complex_float_type_node
10551 : float_type_node
);
10554 gcc_assert (!specs
->long_long_p
&& !specs
->short_p
10555 && !specs
->signed_p
&& !specs
->unsigned_p
);
10558 specs
->type
= (specs
->complex_p
10559 ? complex_long_double_type_node
10560 : long_double_type_node
);
10564 specs
->type
= (specs
->complex_p
10565 ? complex_double_type_node
10566 : double_type_node
);
10571 case cts_dfloat128
:
10572 gcc_assert (!specs
->long_p
&& !specs
->long_long_p
&& !specs
->short_p
10573 && !specs
->signed_p
&& !specs
->unsigned_p
&& !specs
->complex_p
);
10574 if (specs
->typespec_word
== cts_dfloat32
)
10575 specs
->type
= dfloat32_type_node
;
10576 else if (specs
->typespec_word
== cts_dfloat64
)
10577 specs
->type
= dfloat64_type_node
;
10579 specs
->type
= dfloat128_type_node
;
10582 gcc_assert (!specs
->complex_p
);
10583 if (!targetm
.fixed_point_supported_p ())
10584 specs
->type
= integer_type_node
;
10585 else if (specs
->saturating_p
)
10587 if (specs
->long_long_p
)
10588 specs
->type
= specs
->unsigned_p
10589 ? sat_unsigned_long_long_fract_type_node
10590 : sat_long_long_fract_type_node
;
10591 else if (specs
->long_p
)
10592 specs
->type
= specs
->unsigned_p
10593 ? sat_unsigned_long_fract_type_node
10594 : sat_long_fract_type_node
;
10595 else if (specs
->short_p
)
10596 specs
->type
= specs
->unsigned_p
10597 ? sat_unsigned_short_fract_type_node
10598 : sat_short_fract_type_node
;
10600 specs
->type
= specs
->unsigned_p
10601 ? sat_unsigned_fract_type_node
10602 : sat_fract_type_node
;
10606 if (specs
->long_long_p
)
10607 specs
->type
= specs
->unsigned_p
10608 ? unsigned_long_long_fract_type_node
10609 : long_long_fract_type_node
;
10610 else if (specs
->long_p
)
10611 specs
->type
= specs
->unsigned_p
10612 ? unsigned_long_fract_type_node
10613 : long_fract_type_node
;
10614 else if (specs
->short_p
)
10615 specs
->type
= specs
->unsigned_p
10616 ? unsigned_short_fract_type_node
10617 : short_fract_type_node
;
10619 specs
->type
= specs
->unsigned_p
10620 ? unsigned_fract_type_node
10625 gcc_assert (!specs
->complex_p
);
10626 if (!targetm
.fixed_point_supported_p ())
10627 specs
->type
= integer_type_node
;
10628 else if (specs
->saturating_p
)
10630 if (specs
->long_long_p
)
10631 specs
->type
= specs
->unsigned_p
10632 ? sat_unsigned_long_long_accum_type_node
10633 : sat_long_long_accum_type_node
;
10634 else if (specs
->long_p
)
10635 specs
->type
= specs
->unsigned_p
10636 ? sat_unsigned_long_accum_type_node
10637 : sat_long_accum_type_node
;
10638 else if (specs
->short_p
)
10639 specs
->type
= specs
->unsigned_p
10640 ? sat_unsigned_short_accum_type_node
10641 : sat_short_accum_type_node
;
10643 specs
->type
= specs
->unsigned_p
10644 ? sat_unsigned_accum_type_node
10645 : sat_accum_type_node
;
10649 if (specs
->long_long_p
)
10650 specs
->type
= specs
->unsigned_p
10651 ? unsigned_long_long_accum_type_node
10652 : long_long_accum_type_node
;
10653 else if (specs
->long_p
)
10654 specs
->type
= specs
->unsigned_p
10655 ? unsigned_long_accum_type_node
10656 : long_accum_type_node
;
10657 else if (specs
->short_p
)
10658 specs
->type
= specs
->unsigned_p
10659 ? unsigned_short_accum_type_node
10660 : short_accum_type_node
;
10662 specs
->type
= specs
->unsigned_p
10663 ? unsigned_accum_type_node
10668 gcc_unreachable ();
10674 /* A subroutine of c_write_global_declarations. Perform final processing
10675 on one file scope's declarations (or the external scope's declarations),
10679 c_write_global_declarations_1 (tree globals
)
10684 /* Process the decls in the order they were written. */
10685 for (decl
= globals
; decl
; decl
= DECL_CHAIN (decl
))
10687 /* Check for used but undefined static functions using the C
10688 standard's definition of "used", and set TREE_NO_WARNING so
10689 that check_global_declarations doesn't repeat the check. */
10690 if (TREE_CODE (decl
) == FUNCTION_DECL
10691 && DECL_INITIAL (decl
) == 0
10692 && DECL_EXTERNAL (decl
)
10693 && !TREE_PUBLIC (decl
)
10694 && C_DECL_USED (decl
))
10696 pedwarn (input_location
, 0, "%q+F used but never defined", decl
);
10697 TREE_NO_WARNING (decl
) = 1;
10700 wrapup_global_declaration_1 (decl
);
10705 reconsider
= false;
10706 for (decl
= globals
; decl
; decl
= DECL_CHAIN (decl
))
10707 reconsider
|= wrapup_global_declaration_2 (decl
);
10709 while (reconsider
);
10711 for (decl
= globals
; decl
; decl
= DECL_CHAIN (decl
))
10712 check_global_declaration_1 (decl
);
10715 /* A subroutine of c_write_global_declarations Emit debug information for each
10716 of the declarations in GLOBALS. */
10719 c_write_global_declarations_2 (tree globals
)
10723 for (decl
= globals
; decl
; decl
= DECL_CHAIN (decl
))
10724 debug_hooks
->global_decl (decl
);
10727 /* Callback to collect a source_ref from a DECL. */
10730 collect_source_ref_cb (tree decl
)
10732 if (!DECL_IS_BUILTIN (decl
))
10733 collect_source_ref (LOCATION_FILE (decl_sloc (decl
, false)));
10736 /* Preserve the external declarations scope across a garbage collect. */
10737 static GTY(()) tree ext_block
;
10739 /* Collect all references relevant to SOURCE_FILE. */
10742 collect_all_refs (const char *source_file
)
10747 FOR_EACH_VEC_ELT (*all_translation_units
, i
, t
)
10748 collect_ada_nodes (BLOCK_VARS (DECL_INITIAL (t
)), source_file
);
10750 collect_ada_nodes (BLOCK_VARS (ext_block
), source_file
);
10753 /* Iterate over all global declarations and call CALLBACK. */
10756 for_each_global_decl (void (*callback
) (tree decl
))
10763 FOR_EACH_VEC_ELT (*all_translation_units
, i
, t
)
10765 decls
= DECL_INITIAL (t
);
10766 for (decl
= BLOCK_VARS (decls
); decl
; decl
= TREE_CHAIN (decl
))
10770 for (decl
= BLOCK_VARS (ext_block
); decl
; decl
= TREE_CHAIN (decl
))
10775 c_write_global_declarations (void)
10780 /* We don't want to do this if generating a PCH. */
10784 timevar_start (TV_PHASE_DEFERRED
);
10786 /* Do the Objective-C stuff. This is where all the Objective-C
10787 module stuff gets generated (symtab, class/protocol/selector
10789 if (c_dialect_objc ())
10790 objc_write_global_declarations ();
10792 /* Close the external scope. */
10793 ext_block
= pop_scope ();
10794 external_scope
= 0;
10795 gcc_assert (!current_scope
);
10797 /* Handle -fdump-ada-spec[-slim]. */
10798 if (flag_dump_ada_spec
|| flag_dump_ada_spec_slim
)
10800 /* Build a table of files to generate specs for */
10801 if (flag_dump_ada_spec_slim
)
10802 collect_source_ref (main_input_filename
);
10804 for_each_global_decl (collect_source_ref_cb
);
10806 dump_ada_specs (collect_all_refs
, NULL
);
10811 tree tmp
= BLOCK_VARS (ext_block
);
10813 FILE * stream
= dump_begin (TDI_tu
, &flags
);
10816 dump_node (tmp
, flags
& ~TDF_SLIM
, stream
);
10817 dump_end (TDI_tu
, stream
);
10821 /* Process all file scopes in this compilation, and the external_scope,
10822 through wrapup_global_declarations and check_global_declarations. */
10823 FOR_EACH_VEC_ELT (*all_translation_units
, i
, t
)
10824 c_write_global_declarations_1 (BLOCK_VARS (DECL_INITIAL (t
)));
10825 c_write_global_declarations_1 (BLOCK_VARS (ext_block
));
10827 timevar_stop (TV_PHASE_DEFERRED
);
10828 timevar_start (TV_PHASE_OPT_GEN
);
10830 /* We're done parsing; proceed to optimize and emit assembly.
10831 FIXME: shouldn't be the front end's responsibility to call this. */
10832 symtab
->finalize_compilation_unit ();
10834 timevar_stop (TV_PHASE_OPT_GEN
);
10835 timevar_start (TV_PHASE_DBGINFO
);
10837 /* After cgraph has had a chance to emit everything that's going to
10838 be emitted, output debug information for globals. */
10839 if (!seen_error ())
10841 timevar_push (TV_SYMOUT
);
10842 FOR_EACH_VEC_ELT (*all_translation_units
, i
, t
)
10843 c_write_global_declarations_2 (BLOCK_VARS (DECL_INITIAL (t
)));
10844 c_write_global_declarations_2 (BLOCK_VARS (ext_block
));
10845 timevar_pop (TV_SYMOUT
);
10849 timevar_stop (TV_PHASE_DBGINFO
);
10852 /* Register reserved keyword WORD as qualifier for address space AS. */
10855 c_register_addr_space (const char *word
, addr_space_t as
)
10857 int rid
= RID_FIRST_ADDR_SPACE
+ as
;
10860 /* Address space qualifiers are only supported
10861 in C with GNU extensions enabled. */
10862 if (c_dialect_objc () || flag_no_asm
)
10865 id
= get_identifier (word
);
10866 C_SET_RID_CODE (id
, rid
);
10867 C_IS_RESERVED_WORD (id
) = 1;
10868 ridpointers
[rid
] = id
;
10871 /* Return identifier to look up for omp declare reduction. */
10874 c_omp_reduction_id (enum tree_code reduction_code
, tree reduction_id
)
10876 const char *p
= NULL
;
10877 switch (reduction_code
)
10879 case PLUS_EXPR
: p
= "+"; break;
10880 case MULT_EXPR
: p
= "*"; break;
10881 case MINUS_EXPR
: p
= "-"; break;
10882 case BIT_AND_EXPR
: p
= "&"; break;
10883 case BIT_XOR_EXPR
: p
= "^"; break;
10884 case BIT_IOR_EXPR
: p
= "|"; break;
10885 case TRUTH_ANDIF_EXPR
: p
= "&&"; break;
10886 case TRUTH_ORIF_EXPR
: p
= "||"; break;
10887 case MIN_EXPR
: p
= "min"; break;
10888 case MAX_EXPR
: p
= "max"; break;
10895 if (TREE_CODE (reduction_id
) != IDENTIFIER_NODE
)
10896 return error_mark_node
;
10897 p
= IDENTIFIER_POINTER (reduction_id
);
10900 const char prefix
[] = "omp declare reduction ";
10901 size_t lenp
= sizeof (prefix
);
10902 size_t len
= strlen (p
);
10903 char *name
= XALLOCAVEC (char, lenp
+ len
);
10904 memcpy (name
, prefix
, lenp
- 1);
10905 memcpy (name
+ lenp
- 1, p
, len
+ 1);
10906 return get_identifier (name
);
10909 /* Lookup REDUCTION_ID in the current scope, or create an artificial
10910 VAR_DECL, bind it into the current scope and return it. */
10913 c_omp_reduction_decl (tree reduction_id
)
10915 struct c_binding
*b
= I_SYMBOL_BINDING (reduction_id
);
10916 if (b
!= NULL
&& B_IN_CURRENT_SCOPE (b
))
10919 tree decl
= build_decl (BUILTINS_LOCATION
, VAR_DECL
,
10920 reduction_id
, integer_type_node
);
10921 DECL_ARTIFICIAL (decl
) = 1;
10922 DECL_EXTERNAL (decl
) = 1;
10923 TREE_STATIC (decl
) = 1;
10924 TREE_PUBLIC (decl
) = 0;
10925 bind (reduction_id
, decl
, current_scope
, true, false, BUILTINS_LOCATION
);
10929 /* Lookup REDUCTION_ID in the first scope where it has entry for TYPE. */
10932 c_omp_reduction_lookup (tree reduction_id
, tree type
)
10934 struct c_binding
*b
= I_SYMBOL_BINDING (reduction_id
);
10938 for (t
= DECL_INITIAL (b
->decl
); t
; t
= TREE_CHAIN (t
))
10939 if (comptypes (TREE_PURPOSE (t
), type
))
10940 return TREE_VALUE (t
);
10943 return error_mark_node
;
10946 /* Helper function called via walk_tree, to diagnose invalid
10947 #pragma omp declare reduction combiners or initializers. */
10950 c_check_omp_declare_reduction_r (tree
*tp
, int *, void *data
)
10952 tree
*vars
= (tree
*) data
;
10953 if (SSA_VAR_P (*tp
)
10954 && !DECL_ARTIFICIAL (*tp
)
10958 location_t loc
= DECL_SOURCE_LOCATION (vars
[0]);
10959 if (strcmp (IDENTIFIER_POINTER (DECL_NAME (vars
[0])), "omp_out") == 0)
10960 error_at (loc
, "%<#pragma omp declare reduction%> combiner refers to "
10961 "variable %qD which is not %<omp_out%> nor %<omp_in%>",
10964 error_at (loc
, "%<#pragma omp declare reduction%> initializer refers "
10965 "to variable %qD which is not %<omp_priv%> nor "
10973 #include "gt-c-c-decl.h"