1 /* Process declarations and variables for C compiler.
2 Copyright (C) 1988-2013 Free Software Foundation, Inc.
4 This file is part of GCC.
6 GCC is free software; you can redistribute it and/or modify it under
7 the terms of the GNU General Public License as published by the Free
8 Software Foundation; either version 3, or (at your option) any later
11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 You should have received a copy of the GNU General Public License
17 along with GCC; see the file COPYING3. If not see
18 <http://www.gnu.org/licenses/>. */
20 /* Process declarations and symbol lookup for C front end.
21 Also constructs types; the standard scalar types at initialization,
22 and structure, union, array and enum types when they are declared. */
24 /* ??? not all decl nodes are given the most useful possible
25 line numbers. For example, the CONST_DECLs for enum values. */
29 #include "coretypes.h"
34 #include "print-tree.h"
35 #include "stor-layout.h"
38 #include "stringpool.h"
39 #include "tree-inline.h"
50 #include "c-family/c-common.h"
51 #include "c-family/c-objc.h"
52 #include "c-family/c-pragma.h"
53 #include "c-family/c-ubsan.h"
55 #include "langhooks.h"
56 #include "tree-iterator.h"
57 #include "diagnostic-core.h"
60 #include "hash-table.h"
61 #include "langhooks-def.h"
62 #include "pointer-set.h"
64 #include "c-family/c-ada-spec.h"
67 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
69 { NORMAL
, /* Ordinary declaration */
70 FUNCDEF
, /* Function definition */
71 PARM
, /* Declaration of parm before function body */
72 FIELD
, /* Declaration inside struct or union */
73 TYPENAME
}; /* Typename (inside cast or sizeof) */
75 /* States indicating how grokdeclarator() should handle declspecs marked
76 with __attribute__((deprecated)). An object declared as
77 __attribute__((deprecated)) suppresses warnings of uses of other
80 enum deprecated_states
{
86 /* Nonzero if we have seen an invalid cross reference
87 to a struct, union, or enum, but not yet printed the message. */
88 tree pending_invalid_xref
;
90 /* File and line to appear in the eventual error message. */
91 location_t pending_invalid_xref_location
;
93 /* The file and line that the prototype came from if this is an
94 old-style definition; used for diagnostics in
95 store_parm_decls_oldstyle. */
97 static location_t current_function_prototype_locus
;
99 /* Whether this prototype was built-in. */
101 static bool current_function_prototype_built_in
;
103 /* The argument type information of this prototype. */
105 static tree current_function_prototype_arg_types
;
107 /* The argument information structure for the function currently being
110 static struct c_arg_info
*current_function_arg_info
;
112 /* The obstack on which parser and related data structures, which are
113 not live beyond their top-level declaration or definition, are
115 struct obstack parser_obstack
;
117 /* The current statement tree. */
119 static GTY(()) struct stmt_tree_s c_stmt_tree
;
121 /* State saving variables. */
125 /* A list of decls to be made automatically visible in each file scope. */
126 static GTY(()) tree visible_builtins
;
128 /* Set to 0 at beginning of a function definition, set to 1 if
129 a return statement that specifies a return value is seen. */
131 int current_function_returns_value
;
133 /* Set to 0 at beginning of a function definition, set to 1 if
134 a return statement with no argument is seen. */
136 int current_function_returns_null
;
138 /* Set to 0 at beginning of a function definition, set to 1 if
139 a call to a noreturn function is seen. */
141 int current_function_returns_abnormally
;
143 /* Set to nonzero by `grokdeclarator' for a function
144 whose return type is defaulted, if warnings for this are desired. */
146 static int warn_about_return_type
;
148 /* Nonzero when the current toplevel function contains a declaration
149 of a nested function which is never defined. */
151 static bool undef_nested_function
;
153 /* Mode used to build pointers (VOIDmode means ptr_mode). */
155 enum machine_mode c_default_pointer_mode
= VOIDmode
;
157 /* If non-zero, implicit "omp declare target" attribute is added into the
159 int current_omp_declare_target_attribute
;
161 /* Each c_binding structure describes one binding of an identifier to
162 a decl. All the decls in a scope - irrespective of namespace - are
163 chained together by the ->prev field, which (as the name implies)
164 runs in reverse order. All the decls in a given namespace bound to
165 a given identifier are chained by the ->shadowed field, which runs
166 from inner to outer scopes.
168 The ->decl field usually points to a DECL node, but there are two
169 exceptions. In the namespace of type tags, the bound entity is a
170 RECORD_TYPE, UNION_TYPE, or ENUMERAL_TYPE node. If an undeclared
171 identifier is encountered, it is bound to error_mark_node to
172 suppress further errors about that identifier in the current
175 The ->u.type field stores the type of the declaration in this scope;
176 if NULL, the type is the type of the ->decl field. This is only of
177 relevance for objects with external or internal linkage which may
178 be redeclared in inner scopes, forming composite types that only
179 persist for the duration of those scopes. In the external scope,
180 this stores the composite of all the types declared for this
181 object, visible or not. The ->inner_comp field (used only at file
182 scope) stores whether an incomplete array type at file scope was
183 completed at an inner scope to an array size other than 1.
185 The ->u.label field is used for labels. It points to a structure
186 which stores additional information used for warnings.
188 The depth field is copied from the scope structure that holds this
189 decl. It is used to preserve the proper ordering of the ->shadowed
190 field (see bind()) and also for a handful of special-case checks.
191 Finally, the invisible bit is true for a decl which should be
192 ignored for purposes of normal name lookup, and the nested bit is
193 true for a decl that's been bound a second time in an inner scope;
194 in all such cases, the binding in the outer scope will have its
195 invisible bit true. */
197 struct GTY((chain_next ("%h.prev"))) c_binding
{
198 union GTY(()) { /* first so GTY desc can use decl */
199 tree
GTY((tag ("0"))) type
; /* the type in this scope */
200 struct c_label_vars
* GTY((tag ("1"))) label
; /* for warnings */
201 } GTY((desc ("TREE_CODE (%0.decl) == LABEL_DECL"))) u
;
202 tree decl
; /* the decl bound */
203 tree id
; /* the identifier it's bound to */
204 struct c_binding
*prev
; /* the previous decl in this scope */
205 struct c_binding
*shadowed
; /* the innermost decl shadowed by this one */
206 unsigned int depth
: 28; /* depth of this scope */
207 BOOL_BITFIELD invisible
: 1; /* normal lookup should ignore this binding */
208 BOOL_BITFIELD nested
: 1; /* do not set DECL_CONTEXT when popping */
209 BOOL_BITFIELD inner_comp
: 1; /* incomplete array completed in inner scope */
210 BOOL_BITFIELD in_struct
: 1; /* currently defined as struct field */
211 location_t locus
; /* location for nested bindings */
213 #define B_IN_SCOPE(b1, b2) ((b1)->depth == (b2)->depth)
214 #define B_IN_CURRENT_SCOPE(b) ((b)->depth == current_scope->depth)
215 #define B_IN_FILE_SCOPE(b) ((b)->depth == 1 /*file_scope->depth*/)
216 #define B_IN_EXTERNAL_SCOPE(b) ((b)->depth == 0 /*external_scope->depth*/)
218 #define I_SYMBOL_BINDING(node) \
219 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->symbol_binding)
220 #define I_SYMBOL_DECL(node) \
221 (I_SYMBOL_BINDING(node) ? I_SYMBOL_BINDING(node)->decl : 0)
223 #define I_TAG_BINDING(node) \
224 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->tag_binding)
225 #define I_TAG_DECL(node) \
226 (I_TAG_BINDING(node) ? I_TAG_BINDING(node)->decl : 0)
228 #define I_LABEL_BINDING(node) \
229 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->label_binding)
230 #define I_LABEL_DECL(node) \
231 (I_LABEL_BINDING(node) ? I_LABEL_BINDING(node)->decl : 0)
233 /* Each C symbol points to three linked lists of c_binding structures.
234 These describe the values of the identifier in the three different
235 namespaces defined by the language. */
237 struct GTY(()) lang_identifier
{
238 struct c_common_identifier common_id
;
239 struct c_binding
*symbol_binding
; /* vars, funcs, constants, typedefs */
240 struct c_binding
*tag_binding
; /* struct/union/enum tags */
241 struct c_binding
*label_binding
; /* labels */
244 /* Validate c-lang.c's assumptions. */
245 extern char C_SIZEOF_STRUCT_LANG_IDENTIFIER_isnt_accurate
246 [(sizeof(struct lang_identifier
) == C_SIZEOF_STRUCT_LANG_IDENTIFIER
) ? 1 : -1];
248 /* The resulting tree type. */
250 union GTY((desc ("TREE_CODE (&%h.generic) == IDENTIFIER_NODE"),
251 chain_next ("(union lang_tree_node *) c_tree_chain_next (&%h.generic)"))) lang_tree_node
253 union tree_node
GTY ((tag ("0"),
254 desc ("tree_node_structure (&%h)")))
256 struct lang_identifier
GTY ((tag ("1"))) identifier
;
259 /* Track bindings and other things that matter for goto warnings. For
260 efficiency, we do not gather all the decls at the point of
261 definition. Instead, we point into the bindings structure. As
262 scopes are popped, we update these structures and gather the decls
263 that matter at that time. */
265 struct GTY(()) c_spot_bindings
{
266 /* The currently open scope which holds bindings defined when the
267 label was defined or the goto statement was found. */
268 struct c_scope
*scope
;
269 /* The bindings in the scope field which were defined at the point
270 of the label or goto. This lets us look at older or newer
271 bindings in the scope, as appropriate. */
272 struct c_binding
*bindings_in_scope
;
273 /* The number of statement expressions that have started since this
274 label or goto statement was defined. This is zero if we are at
275 the same statement expression level. It is positive if we are in
276 a statement expression started since this spot. It is negative
277 if this spot was in a statement expression and we have left
280 /* Whether we started in a statement expression but are no longer in
281 it. This is set to true if stmt_exprs ever goes negative. */
285 /* This structure is used to keep track of bindings seen when a goto
286 statement is defined. This is only used if we see the goto
287 statement before we see the label. */
289 struct GTY(()) c_goto_bindings
{
290 /* The location of the goto statement. */
292 /* The bindings of the goto statement. */
293 struct c_spot_bindings goto_bindings
;
296 typedef struct c_goto_bindings
*c_goto_bindings_p
;
298 /* The additional information we keep track of for a label binding.
299 These fields are updated as scopes are popped. */
301 struct GTY(()) c_label_vars
{
302 /* The shadowed c_label_vars, when one label shadows another (which
303 can only happen using a __label__ declaration). */
304 struct c_label_vars
*shadowed
;
305 /* The bindings when the label was defined. */
306 struct c_spot_bindings label_bindings
;
307 /* A list of decls that we care about: decls about which we should
308 warn if a goto branches to this label from later in the function.
309 Decls are added to this list as scopes are popped. We only add
310 the decls that matter. */
311 vec
<tree
, va_gc
> *decls_in_scope
;
312 /* A list of goto statements to this label. This is only used for
313 goto statements seen before the label was defined, so that we can
314 issue appropriate warnings for them. */
315 vec
<c_goto_bindings_p
, va_gc
> *gotos
;
318 /* Each c_scope structure describes the complete contents of one
319 scope. Four scopes are distinguished specially: the innermost or
320 current scope, the innermost function scope, the file scope (always
321 the second to outermost) and the outermost or external scope.
323 Most declarations are recorded in the current scope.
325 All normal label declarations are recorded in the innermost
326 function scope, as are bindings of undeclared identifiers to
327 error_mark_node. (GCC permits nested functions as an extension,
328 hence the 'innermost' qualifier.) Explicitly declared labels
329 (using the __label__ extension) appear in the current scope.
331 Being in the file scope (current_scope == file_scope) causes
332 special behavior in several places below. Also, under some
333 conditions the Objective-C front end records declarations in the
334 file scope even though that isn't the current scope.
336 All declarations with external linkage are recorded in the external
337 scope, even if they aren't visible there; this models the fact that
338 such declarations are visible to the entire program, and (with a
339 bit of cleverness, see pushdecl) allows diagnosis of some violations
340 of C99 6.2.2p7 and 6.2.7p2:
342 If, within the same translation unit, the same identifier appears
343 with both internal and external linkage, the behavior is
346 All declarations that refer to the same object or function shall
347 have compatible type; otherwise, the behavior is undefined.
349 Initially only the built-in declarations, which describe compiler
350 intrinsic functions plus a subset of the standard library, are in
353 The order of the blocks list matters, and it is frequently appended
354 to. To avoid having to walk all the way to the end of the list on
355 each insertion, or reverse the list later, we maintain a pointer to
356 the last list entry. (FIXME: It should be feasible to use a reversed
359 The bindings list is strictly in reverse order of declarations;
360 pop_scope relies on this. */
363 struct GTY((chain_next ("%h.outer"))) c_scope
{
364 /* The scope containing this one. */
365 struct c_scope
*outer
;
367 /* The next outermost function scope. */
368 struct c_scope
*outer_function
;
370 /* All bindings in this scope. */
371 struct c_binding
*bindings
;
373 /* For each scope (except the global one), a chain of BLOCK nodes
374 for all the scopes that were entered and exited one level down. */
378 /* The depth of this scope. Used to keep the ->shadowed chain of
379 bindings sorted innermost to outermost. */
380 unsigned int depth
: 28;
382 /* True if we are currently filling this scope with parameter
384 BOOL_BITFIELD parm_flag
: 1;
386 /* True if we saw [*] in this scope. Used to give an error messages
387 if these appears in a function definition. */
388 BOOL_BITFIELD had_vla_unspec
: 1;
390 /* True if we already complained about forward parameter decls
391 in this scope. This prevents double warnings on
392 foo (int a; int b; ...) */
393 BOOL_BITFIELD warned_forward_parm_decls
: 1;
395 /* True if this is the outermost block scope of a function body.
396 This scope contains the parameters, the local variables declared
397 in the outermost block, and all the labels (except those in
398 nested functions, or declared at block scope with __label__). */
399 BOOL_BITFIELD function_body
: 1;
401 /* True means make a BLOCK for this scope no matter what. */
402 BOOL_BITFIELD keep
: 1;
404 /* True means that an unsuffixed float constant is _Decimal64. */
405 BOOL_BITFIELD float_const_decimal64
: 1;
407 /* True if this scope has any label bindings. This is used to speed
408 up searching for labels when popping scopes, particularly since
409 labels are normally only found at function scope. */
410 BOOL_BITFIELD has_label_bindings
: 1;
412 /* True if we should issue a warning if a goto statement crosses any
413 of the bindings. We still need to check the list of bindings to
414 find the specific ones we need to warn about. This is true if
415 decl_jump_unsafe would return true for any of the bindings. This
416 is used to avoid looping over all the bindings unnecessarily. */
417 BOOL_BITFIELD has_jump_unsafe_decl
: 1;
420 /* The scope currently in effect. */
422 static GTY(()) struct c_scope
*current_scope
;
424 /* The innermost function scope. Ordinary (not explicitly declared)
425 labels, bindings to error_mark_node, and the lazily-created
426 bindings of __func__ and its friends get this scope. */
428 static GTY(()) struct c_scope
*current_function_scope
;
430 /* The C file scope. This is reset for each input translation unit. */
432 static GTY(()) struct c_scope
*file_scope
;
434 /* The outermost scope. This is used for all declarations with
435 external linkage, and only these, hence the name. */
437 static GTY(()) struct c_scope
*external_scope
;
439 /* A chain of c_scope structures awaiting reuse. */
441 static GTY((deletable
)) struct c_scope
*scope_freelist
;
443 /* A chain of c_binding structures awaiting reuse. */
445 static GTY((deletable
)) struct c_binding
*binding_freelist
;
447 /* Append VAR to LIST in scope SCOPE. */
448 #define SCOPE_LIST_APPEND(scope, list, decl) do { \
449 struct c_scope *s_ = (scope); \
451 if (s_->list##_last) \
452 BLOCK_CHAIN (s_->list##_last) = d_; \
455 s_->list##_last = d_; \
458 /* Concatenate FROM in scope FSCOPE onto TO in scope TSCOPE. */
459 #define SCOPE_LIST_CONCAT(tscope, to, fscope, from) do { \
460 struct c_scope *t_ = (tscope); \
461 struct c_scope *f_ = (fscope); \
463 BLOCK_CHAIN (t_->to##_last) = f_->from; \
466 t_->to##_last = f_->from##_last; \
469 /* A c_inline_static structure stores details of a static identifier
470 referenced in a definition of a function that may be an inline
471 definition if no subsequent declaration of that function uses
472 "extern" or does not use "inline". */
474 struct GTY((chain_next ("%h.next"))) c_inline_static
{
475 /* The location for a diagnostic. */
478 /* The function that may be an inline definition. */
481 /* The object or function referenced. */
484 /* What sort of reference this is. */
485 enum c_inline_static_type type
;
487 /* The next such structure or NULL. */
488 struct c_inline_static
*next
;
491 /* List of static identifiers used or referenced in functions that may
492 be inline definitions. */
493 static GTY(()) struct c_inline_static
*c_inline_statics
;
495 /* True means unconditionally make a BLOCK for the next scope pushed. */
497 static bool keep_next_level_flag
;
499 /* True means the next call to push_scope will be the outermost scope
500 of a function body, so do not push a new scope, merely cease
501 expecting parameter decls. */
503 static bool next_is_function_body
;
505 /* A vector of pointers to c_binding structures. */
507 typedef struct c_binding
*c_binding_ptr
;
509 /* Information that we keep for a struct or union while it is being
512 struct c_struct_parse_info
514 /* If warn_cxx_compat, a list of types defined within this
516 vec
<tree
> struct_types
;
517 /* If warn_cxx_compat, a list of field names which have bindings,
518 and which are defined in this struct, but which are not defined
519 in any enclosing struct. This is used to clear the in_struct
520 field of the c_bindings structure. */
521 vec
<c_binding_ptr
> fields
;
522 /* If warn_cxx_compat, a list of typedef names used when defining
523 fields in this struct. */
524 vec
<tree
> typedefs_seen
;
527 /* Information for the struct or union currently being parsed, or
528 NULL if not parsing a struct or union. */
529 static struct c_struct_parse_info
*struct_parse_info
;
531 /* Forward declarations. */
532 static tree
lookup_name_in_scope (tree
, struct c_scope
*);
533 static tree
c_make_fname_decl (location_t
, tree
, int);
534 static tree
grokdeclarator (const struct c_declarator
*,
535 struct c_declspecs
*,
536 enum decl_context
, bool, tree
*, tree
*, tree
*,
537 bool *, enum deprecated_states
);
538 static tree
grokparms (struct c_arg_info
*, bool);
539 static void layout_array_type (tree
);
541 /* T is a statement. Add it to the statement-tree. This is the
542 C/ObjC version--C++ has a slightly different version of this
548 enum tree_code code
= TREE_CODE (t
);
550 if (CAN_HAVE_LOCATION_P (t
) && code
!= LABEL_EXPR
)
552 if (!EXPR_HAS_LOCATION (t
))
553 SET_EXPR_LOCATION (t
, input_location
);
556 if (code
== LABEL_EXPR
|| code
== CASE_LABEL_EXPR
)
557 STATEMENT_LIST_HAS_LABEL (cur_stmt_list
) = 1;
559 /* Add T to the statement-tree. Non-side-effect statements need to be
560 recorded during statement expressions. */
561 if (!building_stmt_list_p ())
563 append_to_statement_list_force (t
, &cur_stmt_list
);
568 /* Build a pointer type using the default pointer mode. */
571 c_build_pointer_type (tree to_type
)
573 addr_space_t as
= to_type
== error_mark_node
? ADDR_SPACE_GENERIC
574 : TYPE_ADDR_SPACE (to_type
);
575 enum machine_mode pointer_mode
;
577 if (as
!= ADDR_SPACE_GENERIC
|| c_default_pointer_mode
== VOIDmode
)
578 pointer_mode
= targetm
.addr_space
.pointer_mode (as
);
580 pointer_mode
= c_default_pointer_mode
;
581 return build_pointer_type_for_mode (to_type
, pointer_mode
, false);
585 /* Return true if we will want to say something if a goto statement
589 decl_jump_unsafe (tree decl
)
591 if (error_operand_p (decl
))
594 /* Always warn about crossing variably modified types. */
595 if ((TREE_CODE (decl
) == VAR_DECL
|| TREE_CODE (decl
) == TYPE_DECL
)
596 && variably_modified_type_p (TREE_TYPE (decl
), NULL_TREE
))
599 /* Otherwise, only warn if -Wgoto-misses-init and this is an
600 initialized automatic decl. */
601 if (warn_jump_misses_init
602 && TREE_CODE (decl
) == VAR_DECL
603 && !TREE_STATIC (decl
)
604 && DECL_INITIAL (decl
) != NULL_TREE
)
612 c_print_identifier (FILE *file
, tree node
, int indent
)
614 print_node (file
, "symbol", I_SYMBOL_DECL (node
), indent
+ 4);
615 print_node (file
, "tag", I_TAG_DECL (node
), indent
+ 4);
616 print_node (file
, "label", I_LABEL_DECL (node
), indent
+ 4);
617 if (C_IS_RESERVED_WORD (node
) && C_RID_CODE (node
) != RID_CXX_COMPAT_WARN
)
619 tree rid
= ridpointers
[C_RID_CODE (node
)];
620 indent_to (file
, indent
+ 4);
621 fprintf (file
, "rid " HOST_PTR_PRINTF
" \"%s\"",
622 (void *) rid
, IDENTIFIER_POINTER (rid
));
626 /* Establish a binding between NAME, an IDENTIFIER_NODE, and DECL,
627 which may be any of several kinds of DECL or TYPE or error_mark_node,
628 in the scope SCOPE. */
630 bind (tree name
, tree decl
, struct c_scope
*scope
, bool invisible
,
631 bool nested
, location_t locus
)
633 struct c_binding
*b
, **here
;
635 if (binding_freelist
)
637 b
= binding_freelist
;
638 binding_freelist
= b
->prev
;
641 b
= ggc_alloc_c_binding ();
646 b
->depth
= scope
->depth
;
647 b
->invisible
= invisible
;
655 b
->prev
= scope
->bindings
;
658 if (decl_jump_unsafe (decl
))
659 scope
->has_jump_unsafe_decl
= 1;
664 switch (TREE_CODE (decl
))
666 case LABEL_DECL
: here
= &I_LABEL_BINDING (name
); break;
669 case RECORD_TYPE
: here
= &I_TAG_BINDING (name
); break;
675 case ERROR_MARK
: here
= &I_SYMBOL_BINDING (name
); break;
681 /* Locate the appropriate place in the chain of shadowed decls
682 to insert this binding. Normally, scope == current_scope and
683 this does nothing. */
684 while (*here
&& (*here
)->depth
> scope
->depth
)
685 here
= &(*here
)->shadowed
;
691 /* Clear the binding structure B, stick it on the binding_freelist,
692 and return the former value of b->prev. This is used by pop_scope
693 and get_parm_info to iterate destructively over all the bindings
694 from a given scope. */
695 static struct c_binding
*
696 free_binding_and_advance (struct c_binding
*b
)
698 struct c_binding
*prev
= b
->prev
;
700 memset (b
, 0, sizeof (struct c_binding
));
701 b
->prev
= binding_freelist
;
702 binding_freelist
= b
;
707 /* Bind a label. Like bind, but skip fields which aren't used for
708 labels, and add the LABEL_VARS value. */
710 bind_label (tree name
, tree label
, struct c_scope
*scope
,
711 struct c_label_vars
*label_vars
)
715 bind (name
, label
, scope
, /*invisible=*/false, /*nested=*/false,
718 scope
->has_label_bindings
= true;
721 gcc_assert (b
->decl
== label
);
722 label_vars
->shadowed
= b
->u
.label
;
723 b
->u
.label
= label_vars
;
726 /* Hook called at end of compilation to assume 1 elt
727 for a file-scope tentative array defn that wasn't complete before. */
730 c_finish_incomplete_decl (tree decl
)
732 if (TREE_CODE (decl
) == VAR_DECL
)
734 tree type
= TREE_TYPE (decl
);
735 if (type
!= error_mark_node
736 && TREE_CODE (type
) == ARRAY_TYPE
737 && !DECL_EXTERNAL (decl
)
738 && TYPE_DOMAIN (type
) == 0)
740 warning_at (DECL_SOURCE_LOCATION (decl
),
741 0, "array %q+D assumed to have one element", decl
);
743 complete_array_type (&TREE_TYPE (decl
), NULL_TREE
, true);
745 relayout_decl (decl
);
750 /* Record that inline function FUNC contains a reference (location
751 LOC) to static DECL (file-scope or function-local according to
755 record_inline_static (location_t loc
, tree func
, tree decl
,
756 enum c_inline_static_type type
)
758 struct c_inline_static
*csi
= ggc_alloc_c_inline_static ();
760 csi
->function
= func
;
761 csi
->static_decl
= decl
;
763 csi
->next
= c_inline_statics
;
764 c_inline_statics
= csi
;
767 /* Check for references to static declarations in inline functions at
768 the end of the translation unit and diagnose them if the functions
769 are still inline definitions. */
772 check_inline_statics (void)
774 struct c_inline_static
*csi
;
775 for (csi
= c_inline_statics
; csi
; csi
= csi
->next
)
777 if (DECL_EXTERNAL (csi
->function
))
781 pedwarn (csi
->location
, 0,
782 "%qD is static but used in inline function %qD "
783 "which is not static", csi
->static_decl
, csi
->function
);
786 pedwarn (csi
->location
, 0,
787 "%q+D is static but declared in inline function %qD "
788 "which is not static", csi
->static_decl
, csi
->function
);
794 c_inline_statics
= NULL
;
797 /* Fill in a c_spot_bindings structure. If DEFINING is true, set it
798 for the current state, otherwise set it to uninitialized. */
801 set_spot_bindings (struct c_spot_bindings
*p
, bool defining
)
805 p
->scope
= current_scope
;
806 p
->bindings_in_scope
= current_scope
->bindings
;
811 p
->bindings_in_scope
= NULL
;
814 p
->left_stmt_expr
= false;
817 /* Update spot bindings P as we pop out of SCOPE. Return true if we
818 should push decls for a label. */
821 update_spot_bindings (struct c_scope
*scope
, struct c_spot_bindings
*p
)
823 if (p
->scope
!= scope
)
825 /* This label or goto is defined in some other scope, or it is a
826 label which is not yet defined. There is nothing to
831 /* Adjust the spot bindings to refer to the bindings already defined
832 in the enclosing scope. */
833 p
->scope
= scope
->outer
;
834 p
->bindings_in_scope
= p
->scope
->bindings
;
839 /* The Objective-C front-end often needs to determine the current scope. */
842 objc_get_current_scope (void)
844 return current_scope
;
847 /* The following function is used only by Objective-C. It needs to live here
848 because it accesses the innards of c_scope. */
851 objc_mark_locals_volatile (void *enclosing_blk
)
853 struct c_scope
*scope
;
856 for (scope
= current_scope
;
857 scope
&& scope
!= enclosing_blk
;
858 scope
= scope
->outer
)
860 for (b
= scope
->bindings
; b
; b
= b
->prev
)
861 objc_volatilize_decl (b
->decl
);
863 /* Do not climb up past the current function. */
864 if (scope
->function_body
)
869 /* Return true if we are in the global binding level. */
872 global_bindings_p (void)
874 return current_scope
== file_scope
;
878 keep_next_level (void)
880 keep_next_level_flag
= true;
883 /* Set the flag for the FLOAT_CONST_DECIMAL64 pragma being ON. */
886 set_float_const_decimal64 (void)
888 current_scope
->float_const_decimal64
= true;
891 /* Clear the flag for the FLOAT_CONST_DECIMAL64 pragma. */
894 clear_float_const_decimal64 (void)
896 current_scope
->float_const_decimal64
= false;
899 /* Return nonzero if an unsuffixed float constant is _Decimal64. */
902 float_const_decimal64_p (void)
904 return current_scope
->float_const_decimal64
;
907 /* Identify this scope as currently being filled with parameters. */
910 declare_parm_level (void)
912 current_scope
->parm_flag
= true;
918 if (next_is_function_body
)
920 /* This is the transition from the parameters to the top level
921 of the function body. These are the same scope
922 (C99 6.2.1p4,6) so we do not push another scope structure.
923 next_is_function_body is set only by store_parm_decls, which
924 in turn is called when and only when we are about to
925 encounter the opening curly brace for the function body.
927 The outermost block of a function always gets a BLOCK node,
928 because the debugging output routines expect that each
929 function has at least one BLOCK. */
930 current_scope
->parm_flag
= false;
931 current_scope
->function_body
= true;
932 current_scope
->keep
= true;
933 current_scope
->outer_function
= current_function_scope
;
934 current_function_scope
= current_scope
;
936 keep_next_level_flag
= false;
937 next_is_function_body
= false;
939 /* The FLOAT_CONST_DECIMAL64 pragma applies to nested scopes. */
940 if (current_scope
->outer
)
941 current_scope
->float_const_decimal64
942 = current_scope
->outer
->float_const_decimal64
;
944 current_scope
->float_const_decimal64
= false;
948 struct c_scope
*scope
;
951 scope
= scope_freelist
;
952 scope_freelist
= scope
->outer
;
955 scope
= ggc_alloc_cleared_c_scope ();
957 /* The FLOAT_CONST_DECIMAL64 pragma applies to nested scopes. */
959 scope
->float_const_decimal64
= current_scope
->float_const_decimal64
;
961 scope
->float_const_decimal64
= false;
963 scope
->keep
= keep_next_level_flag
;
964 scope
->outer
= current_scope
;
965 scope
->depth
= current_scope
? (current_scope
->depth
+ 1) : 0;
967 /* Check for scope depth overflow. Unlikely (2^28 == 268,435,456) but
969 if (current_scope
&& scope
->depth
== 0)
972 sorry ("GCC supports only %u nested scopes", scope
->depth
);
975 current_scope
= scope
;
976 keep_next_level_flag
= false;
980 /* This is called when we are leaving SCOPE. For each label defined
981 in SCOPE, add any appropriate decls to its decls_in_scope fields.
982 These are the decls whose initialization will be skipped by a goto
983 later in the function. */
986 update_label_decls (struct c_scope
*scope
)
993 if (s
->has_label_bindings
)
997 for (b
= s
->bindings
; b
!= NULL
; b
= b
->prev
)
999 struct c_label_vars
*label_vars
;
1000 struct c_binding
*b1
;
1003 struct c_goto_bindings
*g
;
1005 if (TREE_CODE (b
->decl
) != LABEL_DECL
)
1007 label_vars
= b
->u
.label
;
1009 b1
= label_vars
->label_bindings
.bindings_in_scope
;
1010 if (label_vars
->label_bindings
.scope
== NULL
)
1013 hjud
= label_vars
->label_bindings
.scope
->has_jump_unsafe_decl
;
1014 if (update_spot_bindings (scope
, &label_vars
->label_bindings
))
1016 /* This label is defined in this scope. */
1019 for (; b1
!= NULL
; b1
= b1
->prev
)
1021 /* A goto from later in the function to this
1022 label will never see the initialization
1023 of B1, if any. Save it to issue a
1024 warning if needed. */
1025 if (decl_jump_unsafe (b1
->decl
))
1026 vec_safe_push(label_vars
->decls_in_scope
, b1
->decl
);
1031 /* Update the bindings of any goto statements associated
1033 FOR_EACH_VEC_SAFE_ELT (label_vars
->gotos
, ix
, g
)
1034 update_spot_bindings (scope
, &g
->goto_bindings
);
1038 /* Don't search beyond the current function. */
1039 if (s
== current_function_scope
)
1046 /* Set the TYPE_CONTEXT of all of TYPE's variants to CONTEXT. */
1049 set_type_context (tree type
, tree context
)
1051 for (type
= TYPE_MAIN_VARIANT (type
); type
;
1052 type
= TYPE_NEXT_VARIANT (type
))
1053 TYPE_CONTEXT (type
) = context
;
1056 /* Exit a scope. Restore the state of the identifier-decl mappings
1057 that were in effect when this scope was entered. Return a BLOCK
1058 node containing all the DECLs in this scope that are of interest
1059 to debug info generation. */
1064 struct c_scope
*scope
= current_scope
;
1065 tree block
, context
, p
;
1066 struct c_binding
*b
;
1068 bool functionbody
= scope
->function_body
;
1069 bool keep
= functionbody
|| scope
->keep
|| scope
->bindings
;
1071 update_label_decls (scope
);
1073 /* If appropriate, create a BLOCK to record the decls for the life
1074 of this function. */
1078 block
= make_node (BLOCK
);
1079 BLOCK_SUBBLOCKS (block
) = scope
->blocks
;
1080 TREE_USED (block
) = 1;
1082 /* In each subblock, record that this is its superior. */
1083 for (p
= scope
->blocks
; p
; p
= BLOCK_CHAIN (p
))
1084 BLOCK_SUPERCONTEXT (p
) = block
;
1086 BLOCK_VARS (block
) = 0;
1089 /* The TYPE_CONTEXTs for all of the tagged types belonging to this
1090 scope must be set so that they point to the appropriate
1091 construct, i.e. either to the current FUNCTION_DECL node, or
1092 else to the BLOCK node we just constructed.
1094 Note that for tagged types whose scope is just the formal
1095 parameter list for some function type specification, we can't
1096 properly set their TYPE_CONTEXTs here, because we don't have a
1097 pointer to the appropriate FUNCTION_TYPE node readily available
1098 to us. For those cases, the TYPE_CONTEXTs of the relevant tagged
1099 type nodes get set in `grokdeclarator' as soon as we have created
1100 the FUNCTION_TYPE node which will represent the "scope" for these
1101 "parameter list local" tagged types. */
1102 if (scope
->function_body
)
1103 context
= current_function_decl
;
1104 else if (scope
== file_scope
)
1106 tree file_decl
= build_translation_unit_decl (NULL_TREE
);
1107 context
= file_decl
;
1112 /* Clear all bindings in this scope. */
1113 for (b
= scope
->bindings
; b
; b
= free_binding_and_advance (b
))
1116 switch (TREE_CODE (p
))
1119 /* Warnings for unused labels, errors for undefined labels. */
1120 if (TREE_USED (p
) && !DECL_INITIAL (p
))
1122 error ("label %q+D used but not defined", p
);
1123 DECL_INITIAL (p
) = error_mark_node
;
1126 warn_for_unused_label (p
);
1128 /* Labels go in BLOCK_VARS. */
1129 DECL_CHAIN (p
) = BLOCK_VARS (block
);
1130 BLOCK_VARS (block
) = p
;
1131 gcc_assert (I_LABEL_BINDING (b
->id
) == b
);
1132 I_LABEL_BINDING (b
->id
) = b
->shadowed
;
1134 /* Also pop back to the shadowed label_vars. */
1135 release_tree_vector (b
->u
.label
->decls_in_scope
);
1136 b
->u
.label
= b
->u
.label
->shadowed
;
1142 set_type_context (p
, context
);
1144 /* Types may not have tag-names, in which case the type
1145 appears in the bindings list with b->id NULL. */
1148 gcc_assert (I_TAG_BINDING (b
->id
) == b
);
1149 I_TAG_BINDING (b
->id
) = b
->shadowed
;
1154 /* Propagate TREE_ADDRESSABLE from nested functions to their
1155 containing functions. */
1156 if (!TREE_ASM_WRITTEN (p
)
1157 && DECL_INITIAL (p
) != 0
1158 && TREE_ADDRESSABLE (p
)
1159 && DECL_ABSTRACT_ORIGIN (p
) != 0
1160 && DECL_ABSTRACT_ORIGIN (p
) != p
)
1161 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (p
)) = 1;
1162 if (!DECL_EXTERNAL (p
)
1163 && !DECL_INITIAL (p
)
1164 && scope
!= file_scope
1165 && scope
!= external_scope
)
1167 error ("nested function %q+D declared but never defined", p
);
1168 undef_nested_function
= true;
1170 else if (DECL_DECLARED_INLINE_P (p
)
1172 && !DECL_INITIAL (p
))
1174 /* C99 6.7.4p6: "a function with external linkage... declared
1175 with an inline function specifier ... shall also be defined
1176 in the same translation unit." */
1177 if (!flag_gnu89_inline
)
1178 pedwarn (input_location
, 0,
1179 "inline function %q+D declared but never defined", p
);
1180 DECL_EXTERNAL (p
) = 1;
1186 /* Warnings for unused variables. */
1187 if ((!TREE_USED (p
) || !DECL_READ_P (p
))
1188 && !TREE_NO_WARNING (p
)
1189 && !DECL_IN_SYSTEM_HEADER (p
)
1191 && !DECL_ARTIFICIAL (p
)
1192 && scope
!= file_scope
1193 && scope
!= external_scope
)
1196 warning (OPT_Wunused_variable
, "unused variable %q+D", p
);
1197 else if (DECL_CONTEXT (p
) == current_function_decl
)
1198 warning_at (DECL_SOURCE_LOCATION (p
),
1199 OPT_Wunused_but_set_variable
,
1200 "variable %qD set but not used", p
);
1205 error ("type of array %q+D completed incompatibly with"
1206 " implicit initialization", p
);
1213 /* All of these go in BLOCK_VARS, but only if this is the
1214 binding in the home scope. */
1217 DECL_CHAIN (p
) = BLOCK_VARS (block
);
1218 BLOCK_VARS (block
) = p
;
1220 else if (VAR_OR_FUNCTION_DECL_P (p
) && scope
!= file_scope
)
1222 /* For block local externs add a special
1223 DECL_EXTERNAL decl for debug info generation. */
1224 tree extp
= copy_node (p
);
1226 DECL_EXTERNAL (extp
) = 1;
1227 TREE_STATIC (extp
) = 0;
1228 TREE_PUBLIC (extp
) = 1;
1229 DECL_INITIAL (extp
) = NULL_TREE
;
1230 DECL_LANG_SPECIFIC (extp
) = NULL
;
1231 DECL_CONTEXT (extp
) = current_function_decl
;
1232 if (TREE_CODE (p
) == FUNCTION_DECL
)
1234 DECL_RESULT (extp
) = NULL_TREE
;
1235 DECL_SAVED_TREE (extp
) = NULL_TREE
;
1236 DECL_STRUCT_FUNCTION (extp
) = NULL
;
1238 if (b
->locus
!= UNKNOWN_LOCATION
)
1239 DECL_SOURCE_LOCATION (extp
) = b
->locus
;
1240 DECL_CHAIN (extp
) = BLOCK_VARS (block
);
1241 BLOCK_VARS (block
) = extp
;
1243 /* If this is the file scope set DECL_CONTEXT of each decl to
1244 the TRANSLATION_UNIT_DECL. This makes same_translation_unit_p
1246 if (scope
== file_scope
)
1248 DECL_CONTEXT (p
) = context
;
1249 if (TREE_CODE (p
) == TYPE_DECL
1250 && TREE_TYPE (p
) != error_mark_node
)
1251 set_type_context (TREE_TYPE (p
), context
);
1255 /* Parameters go in DECL_ARGUMENTS, not BLOCK_VARS, and have
1256 already been put there by store_parm_decls. Unused-
1257 parameter warnings are handled by function.c.
1258 error_mark_node obviously does not go in BLOCK_VARS and
1259 does not get unused-variable warnings. */
1262 /* It is possible for a decl not to have a name. We get
1263 here with b->id NULL in this case. */
1266 gcc_assert (I_SYMBOL_BINDING (b
->id
) == b
);
1267 I_SYMBOL_BINDING (b
->id
) = b
->shadowed
;
1268 if (b
->shadowed
&& b
->shadowed
->u
.type
)
1269 TREE_TYPE (b
->shadowed
->decl
) = b
->shadowed
->u
.type
;
1279 /* Dispose of the block that we just made inside some higher level. */
1280 if ((scope
->function_body
|| scope
== file_scope
) && context
)
1282 DECL_INITIAL (context
) = block
;
1283 BLOCK_SUPERCONTEXT (block
) = context
;
1285 else if (scope
->outer
)
1288 SCOPE_LIST_APPEND (scope
->outer
, blocks
, block
);
1289 /* If we did not make a block for the scope just exited, any
1290 blocks made for inner scopes must be carried forward so they
1291 will later become subblocks of something else. */
1292 else if (scope
->blocks
)
1293 SCOPE_LIST_CONCAT (scope
->outer
, blocks
, scope
, blocks
);
1296 /* Pop the current scope, and free the structure for reuse. */
1297 current_scope
= scope
->outer
;
1298 if (scope
->function_body
)
1299 current_function_scope
= scope
->outer_function
;
1301 memset (scope
, 0, sizeof (struct c_scope
));
1302 scope
->outer
= scope_freelist
;
1303 scope_freelist
= scope
;
1309 push_file_scope (void)
1317 file_scope
= current_scope
;
1319 start_fname_decls ();
1321 for (decl
= visible_builtins
; decl
; decl
= DECL_CHAIN (decl
))
1322 bind (DECL_NAME (decl
), decl
, file_scope
,
1323 /*invisible=*/false, /*nested=*/true, DECL_SOURCE_LOCATION (decl
));
1327 pop_file_scope (void)
1329 /* In case there were missing closebraces, get us back to the global
1331 while (current_scope
!= file_scope
)
1334 /* __FUNCTION__ is defined at file scope (""). This
1335 call may not be necessary as my tests indicate it
1336 still works without it. */
1337 finish_fname_decls ();
1339 check_inline_statics ();
1341 /* This is the point to write out a PCH if we're doing that.
1342 In that case we do not want to do anything else. */
1345 c_common_write_pch ();
1349 /* Pop off the file scope and close this translation unit. */
1353 maybe_apply_pending_pragma_weaks ();
1356 /* Adjust the bindings for the start of a statement expression. */
1359 c_bindings_start_stmt_expr (struct c_spot_bindings
* switch_bindings
)
1361 struct c_scope
*scope
;
1363 for (scope
= current_scope
; scope
!= NULL
; scope
= scope
->outer
)
1365 struct c_binding
*b
;
1367 if (!scope
->has_label_bindings
)
1370 for (b
= scope
->bindings
; b
!= NULL
; b
= b
->prev
)
1372 struct c_label_vars
*label_vars
;
1374 struct c_goto_bindings
*g
;
1376 if (TREE_CODE (b
->decl
) != LABEL_DECL
)
1378 label_vars
= b
->u
.label
;
1379 ++label_vars
->label_bindings
.stmt_exprs
;
1380 FOR_EACH_VEC_SAFE_ELT (label_vars
->gotos
, ix
, g
)
1381 ++g
->goto_bindings
.stmt_exprs
;
1385 if (switch_bindings
!= NULL
)
1386 ++switch_bindings
->stmt_exprs
;
1389 /* Adjust the bindings for the end of a statement expression. */
1392 c_bindings_end_stmt_expr (struct c_spot_bindings
*switch_bindings
)
1394 struct c_scope
*scope
;
1396 for (scope
= current_scope
; scope
!= NULL
; scope
= scope
->outer
)
1398 struct c_binding
*b
;
1400 if (!scope
->has_label_bindings
)
1403 for (b
= scope
->bindings
; b
!= NULL
; b
= b
->prev
)
1405 struct c_label_vars
*label_vars
;
1407 struct c_goto_bindings
*g
;
1409 if (TREE_CODE (b
->decl
) != LABEL_DECL
)
1411 label_vars
= b
->u
.label
;
1412 --label_vars
->label_bindings
.stmt_exprs
;
1413 if (label_vars
->label_bindings
.stmt_exprs
< 0)
1415 label_vars
->label_bindings
.left_stmt_expr
= true;
1416 label_vars
->label_bindings
.stmt_exprs
= 0;
1418 FOR_EACH_VEC_SAFE_ELT (label_vars
->gotos
, ix
, g
)
1420 --g
->goto_bindings
.stmt_exprs
;
1421 if (g
->goto_bindings
.stmt_exprs
< 0)
1423 g
->goto_bindings
.left_stmt_expr
= true;
1424 g
->goto_bindings
.stmt_exprs
= 0;
1430 if (switch_bindings
!= NULL
)
1432 --switch_bindings
->stmt_exprs
;
1433 gcc_assert (switch_bindings
->stmt_exprs
>= 0);
1437 /* Push a definition or a declaration of struct, union or enum tag "name".
1438 "type" should be the type node.
1439 We assume that the tag "name" is not already defined, and has a location
1442 Note that the definition may really be just a forward reference.
1443 In that case, the TYPE_SIZE will be zero. */
1446 pushtag (location_t loc
, tree name
, tree type
)
1448 /* Record the identifier as the type's name if it has none. */
1449 if (name
&& !TYPE_NAME (type
))
1450 TYPE_NAME (type
) = name
;
1451 bind (name
, type
, current_scope
, /*invisible=*/false, /*nested=*/false, loc
);
1453 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1454 tagged type we just added to the current scope. This fake
1455 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1456 to output a representation of a tagged type, and it also gives
1457 us a convenient place to record the "scope start" address for the
1460 TYPE_STUB_DECL (type
) = pushdecl (build_decl (loc
,
1461 TYPE_DECL
, NULL_TREE
, type
));
1463 /* An approximation for now, so we can tell this is a function-scope tag.
1464 This will be updated in pop_scope. */
1465 TYPE_CONTEXT (type
) = DECL_CONTEXT (TYPE_STUB_DECL (type
));
1467 if (warn_cxx_compat
&& name
!= NULL_TREE
)
1469 struct c_binding
*b
= I_SYMBOL_BINDING (name
);
1472 && b
->decl
!= NULL_TREE
1473 && TREE_CODE (b
->decl
) == TYPE_DECL
1474 && (B_IN_CURRENT_SCOPE (b
)
1475 || (current_scope
== file_scope
&& B_IN_EXTERNAL_SCOPE (b
)))
1476 && (TYPE_MAIN_VARIANT (TREE_TYPE (b
->decl
))
1477 != TYPE_MAIN_VARIANT (type
)))
1479 warning_at (loc
, OPT_Wc___compat
,
1480 ("using %qD as both a typedef and a tag is "
1483 if (b
->locus
!= UNKNOWN_LOCATION
)
1484 inform (b
->locus
, "originally defined here");
1489 /* Subroutine of compare_decls. Allow harmless mismatches in return
1490 and argument types provided that the type modes match. This function
1491 return a unified type given a suitable match, and 0 otherwise. */
1494 match_builtin_function_types (tree newtype
, tree oldtype
)
1496 tree newrettype
, oldrettype
;
1497 tree newargs
, oldargs
;
1498 tree trytype
, tryargs
;
1500 /* Accept the return type of the new declaration if same modes. */
1501 oldrettype
= TREE_TYPE (oldtype
);
1502 newrettype
= TREE_TYPE (newtype
);
1504 if (TYPE_MODE (oldrettype
) != TYPE_MODE (newrettype
))
1507 oldargs
= TYPE_ARG_TYPES (oldtype
);
1508 newargs
= TYPE_ARG_TYPES (newtype
);
1511 while (oldargs
|| newargs
)
1515 || !TREE_VALUE (oldargs
)
1516 || !TREE_VALUE (newargs
)
1517 || TYPE_MODE (TREE_VALUE (oldargs
))
1518 != TYPE_MODE (TREE_VALUE (newargs
)))
1521 oldargs
= TREE_CHAIN (oldargs
);
1522 newargs
= TREE_CHAIN (newargs
);
1525 trytype
= build_function_type (newrettype
, tryargs
);
1526 return build_type_attribute_variant (trytype
, TYPE_ATTRIBUTES (oldtype
));
1529 /* Subroutine of diagnose_mismatched_decls. Check for function type
1530 mismatch involving an empty arglist vs a nonempty one and give clearer
1533 diagnose_arglist_conflict (tree newdecl
, tree olddecl
,
1534 tree newtype
, tree oldtype
)
1538 if (TREE_CODE (olddecl
) != FUNCTION_DECL
1539 || !comptypes (TREE_TYPE (oldtype
), TREE_TYPE (newtype
))
1540 || !((!prototype_p (oldtype
) && DECL_INITIAL (olddecl
) == 0)
1541 || (!prototype_p (newtype
) && DECL_INITIAL (newdecl
) == 0)))
1544 t
= TYPE_ARG_TYPES (oldtype
);
1546 t
= TYPE_ARG_TYPES (newtype
);
1547 for (; t
; t
= TREE_CHAIN (t
))
1549 tree type
= TREE_VALUE (t
);
1551 if (TREE_CHAIN (t
) == 0
1552 && TYPE_MAIN_VARIANT (type
) != void_type_node
)
1554 inform (input_location
, "a parameter list with an ellipsis can%'t match "
1555 "an empty parameter name list declaration");
1559 if (c_type_promotes_to (type
) != type
)
1561 inform (input_location
, "an argument type that has a default promotion can%'t match "
1562 "an empty parameter name list declaration");
1568 /* Another subroutine of diagnose_mismatched_decls. OLDDECL is an
1569 old-style function definition, NEWDECL is a prototype declaration.
1570 Diagnose inconsistencies in the argument list. Returns TRUE if
1571 the prototype is compatible, FALSE if not. */
1573 validate_proto_after_old_defn (tree newdecl
, tree newtype
, tree oldtype
)
1575 tree newargs
, oldargs
;
1578 #define END_OF_ARGLIST(t) ((t) == void_type_node)
1580 oldargs
= TYPE_ACTUAL_ARG_TYPES (oldtype
);
1581 newargs
= TYPE_ARG_TYPES (newtype
);
1586 tree oldargtype
= TREE_VALUE (oldargs
);
1587 tree newargtype
= TREE_VALUE (newargs
);
1589 if (oldargtype
== error_mark_node
|| newargtype
== error_mark_node
)
1592 oldargtype
= (TYPE_ATOMIC (oldargtype
)
1593 ? c_build_qualified_type (TYPE_MAIN_VARIANT (oldargtype
),
1595 : TYPE_MAIN_VARIANT (oldargtype
));
1596 newargtype
= (TYPE_ATOMIC (newargtype
)
1597 ? c_build_qualified_type (TYPE_MAIN_VARIANT (newargtype
),
1599 : TYPE_MAIN_VARIANT (newargtype
));
1601 if (END_OF_ARGLIST (oldargtype
) && END_OF_ARGLIST (newargtype
))
1604 /* Reaching the end of just one list means the two decls don't
1605 agree on the number of arguments. */
1606 if (END_OF_ARGLIST (oldargtype
))
1608 error ("prototype for %q+D declares more arguments "
1609 "than previous old-style definition", newdecl
);
1612 else if (END_OF_ARGLIST (newargtype
))
1614 error ("prototype for %q+D declares fewer arguments "
1615 "than previous old-style definition", newdecl
);
1619 /* Type for passing arg must be consistent with that declared
1621 else if (!comptypes (oldargtype
, newargtype
))
1623 error ("prototype for %q+D declares argument %d"
1624 " with incompatible type",
1629 oldargs
= TREE_CHAIN (oldargs
);
1630 newargs
= TREE_CHAIN (newargs
);
1634 /* If we get here, no errors were found, but do issue a warning
1635 for this poor-style construct. */
1636 warning (0, "prototype for %q+D follows non-prototype definition",
1639 #undef END_OF_ARGLIST
1642 /* Subroutine of diagnose_mismatched_decls. Report the location of DECL,
1643 first in a pair of mismatched declarations, using the diagnostic
1646 locate_old_decl (tree decl
)
1648 if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_BUILT_IN (decl
)
1649 && !C_DECL_DECLARED_BUILTIN (decl
))
1651 else if (DECL_INITIAL (decl
))
1652 inform (input_location
, "previous definition of %q+D was here", decl
);
1653 else if (C_DECL_IMPLICIT (decl
))
1654 inform (input_location
, "previous implicit declaration of %q+D was here", decl
);
1656 inform (input_location
, "previous declaration of %q+D was here", decl
);
1659 /* Subroutine of duplicate_decls. Compare NEWDECL to OLDDECL.
1660 Returns true if the caller should proceed to merge the two, false
1661 if OLDDECL should simply be discarded. As a side effect, issues
1662 all necessary diagnostics for invalid or poor-style combinations.
1663 If it returns true, writes the types of NEWDECL and OLDDECL to
1664 *NEWTYPEP and *OLDTYPEP - these may have been adjusted from
1665 TREE_TYPE (NEWDECL, OLDDECL) respectively. */
1668 diagnose_mismatched_decls (tree newdecl
, tree olddecl
,
1669 tree
*newtypep
, tree
*oldtypep
)
1671 tree newtype
, oldtype
;
1672 bool pedwarned
= false;
1673 bool warned
= false;
1676 #define DECL_EXTERN_INLINE(DECL) (DECL_DECLARED_INLINE_P (DECL) \
1677 && DECL_EXTERNAL (DECL))
1679 /* If we have error_mark_node for either decl or type, just discard
1680 the previous decl - we're in an error cascade already. */
1681 if (olddecl
== error_mark_node
|| newdecl
== error_mark_node
)
1683 *oldtypep
= oldtype
= TREE_TYPE (olddecl
);
1684 *newtypep
= newtype
= TREE_TYPE (newdecl
);
1685 if (oldtype
== error_mark_node
|| newtype
== error_mark_node
)
1688 /* Two different categories of symbol altogether. This is an error
1689 unless OLDDECL is a builtin. OLDDECL will be discarded in any case. */
1690 if (TREE_CODE (olddecl
) != TREE_CODE (newdecl
))
1692 if (!(TREE_CODE (olddecl
) == FUNCTION_DECL
1693 && DECL_BUILT_IN (olddecl
)
1694 && !C_DECL_DECLARED_BUILTIN (olddecl
)))
1696 error ("%q+D redeclared as different kind of symbol", newdecl
);
1697 locate_old_decl (olddecl
);
1699 else if (TREE_PUBLIC (newdecl
))
1700 warning (0, "built-in function %q+D declared as non-function",
1703 warning (OPT_Wshadow
, "declaration of %q+D shadows "
1704 "a built-in function", newdecl
);
1708 /* Enumerators have no linkage, so may only be declared once in a
1710 if (TREE_CODE (olddecl
) == CONST_DECL
)
1712 error ("redeclaration of enumerator %q+D", newdecl
);
1713 locate_old_decl (olddecl
);
1717 if (!comptypes (oldtype
, newtype
))
1719 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1720 && DECL_BUILT_IN (olddecl
) && !C_DECL_DECLARED_BUILTIN (olddecl
))
1722 /* Accept harmless mismatch in function types.
1723 This is for the ffs and fprintf builtins. */
1724 tree trytype
= match_builtin_function_types (newtype
, oldtype
);
1726 if (trytype
&& comptypes (newtype
, trytype
))
1727 *oldtypep
= oldtype
= trytype
;
1730 /* If types don't match for a built-in, throw away the
1731 built-in. No point in calling locate_old_decl here, it
1732 won't print anything. */
1733 warning (0, "conflicting types for built-in function %q+D",
1738 else if (TREE_CODE (olddecl
) == FUNCTION_DECL
1739 && DECL_IS_BUILTIN (olddecl
))
1741 /* A conflicting function declaration for a predeclared
1742 function that isn't actually built in. Objective C uses
1743 these. The new declaration silently overrides everything
1744 but the volatility (i.e. noreturn) indication. See also
1745 below. FIXME: Make Objective C use normal builtins. */
1746 TREE_THIS_VOLATILE (newdecl
) |= TREE_THIS_VOLATILE (olddecl
);
1749 /* Permit void foo (...) to match int foo (...) if the latter is
1750 the definition and implicit int was used. See
1751 c-torture/compile/920625-2.c. */
1752 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
&& DECL_INITIAL (newdecl
)
1753 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype
)) == void_type_node
1754 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype
)) == integer_type_node
1755 && C_FUNCTION_IMPLICIT_INT (newdecl
) && !DECL_INITIAL (olddecl
))
1757 pedwarned
= pedwarn (input_location
, 0,
1758 "conflicting types for %q+D", newdecl
);
1759 /* Make sure we keep void as the return type. */
1760 TREE_TYPE (newdecl
) = *newtypep
= newtype
= oldtype
;
1761 C_FUNCTION_IMPLICIT_INT (newdecl
) = 0;
1763 /* Permit void foo (...) to match an earlier call to foo (...) with
1764 no declared type (thus, implicitly int). */
1765 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
1766 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype
)) == void_type_node
1767 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype
)) == integer_type_node
1768 && C_DECL_IMPLICIT (olddecl
) && !DECL_INITIAL (olddecl
))
1770 pedwarned
= pedwarn (input_location
, 0,
1771 "conflicting types for %q+D", newdecl
);
1772 /* Make sure we keep void as the return type. */
1773 TREE_TYPE (olddecl
) = *oldtypep
= oldtype
= newtype
;
1777 int new_quals
= TYPE_QUALS (newtype
);
1778 int old_quals
= TYPE_QUALS (oldtype
);
1780 if (new_quals
!= old_quals
)
1782 addr_space_t new_addr
= DECODE_QUAL_ADDR_SPACE (new_quals
);
1783 addr_space_t old_addr
= DECODE_QUAL_ADDR_SPACE (old_quals
);
1784 if (new_addr
!= old_addr
)
1786 if (ADDR_SPACE_GENERIC_P (new_addr
))
1787 error ("conflicting named address spaces (generic vs %s) "
1789 c_addr_space_name (old_addr
), newdecl
);
1790 else if (ADDR_SPACE_GENERIC_P (old_addr
))
1791 error ("conflicting named address spaces (%s vs generic) "
1793 c_addr_space_name (new_addr
), newdecl
);
1795 error ("conflicting named address spaces (%s vs %s) "
1797 c_addr_space_name (new_addr
),
1798 c_addr_space_name (old_addr
),
1802 if (CLEAR_QUAL_ADDR_SPACE (new_quals
)
1803 != CLEAR_QUAL_ADDR_SPACE (old_quals
))
1804 error ("conflicting type qualifiers for %q+D", newdecl
);
1807 error ("conflicting types for %q+D", newdecl
);
1808 diagnose_arglist_conflict (newdecl
, olddecl
, newtype
, oldtype
);
1809 locate_old_decl (olddecl
);
1814 /* Redeclaration of a type is a constraint violation (6.7.2.3p1),
1815 but silently ignore the redeclaration if either is in a system
1816 header. (Conflicting redeclarations were handled above.) This
1817 is allowed for C11 if the types are the same, not just
1819 if (TREE_CODE (newdecl
) == TYPE_DECL
)
1821 bool types_different
= false;
1822 int comptypes_result
;
1825 = comptypes_check_different_types (oldtype
, newtype
, &types_different
);
1827 if (comptypes_result
!= 1 || types_different
)
1829 error ("redefinition of typedef %q+D with different type", newdecl
);
1830 locate_old_decl (olddecl
);
1834 if (DECL_IN_SYSTEM_HEADER (newdecl
)
1835 || DECL_IN_SYSTEM_HEADER (olddecl
)
1836 || TREE_NO_WARNING (newdecl
)
1837 || TREE_NO_WARNING (olddecl
))
1838 return true; /* Allow OLDDECL to continue in use. */
1840 if (variably_modified_type_p (newtype
, NULL
))
1842 error ("redefinition of typedef %q+D with variably modified type",
1844 locate_old_decl (olddecl
);
1846 else if (pedantic
&& !flag_isoc11
)
1848 pedwarn (input_location
, OPT_Wpedantic
,
1849 "redefinition of typedef %q+D", newdecl
);
1850 locate_old_decl (olddecl
);
1856 /* Function declarations can either be 'static' or 'extern' (no
1857 qualifier is equivalent to 'extern' - C99 6.2.2p5) and therefore
1858 can never conflict with each other on account of linkage
1859 (6.2.2p4). Multiple definitions are not allowed (6.9p3,5) but
1860 gnu89 mode permits two definitions if one is 'extern inline' and
1861 one is not. The non- extern-inline definition supersedes the
1862 extern-inline definition. */
1864 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1866 /* If you declare a built-in function name as static, or
1867 define the built-in with an old-style definition (so we
1868 can't validate the argument list) the built-in definition is
1869 overridden, but optionally warn this was a bad choice of name. */
1870 if (DECL_BUILT_IN (olddecl
)
1871 && !C_DECL_DECLARED_BUILTIN (olddecl
)
1872 && (!TREE_PUBLIC (newdecl
)
1873 || (DECL_INITIAL (newdecl
)
1874 && !prototype_p (TREE_TYPE (newdecl
)))))
1876 warning (OPT_Wshadow
, "declaration of %q+D shadows "
1877 "a built-in function", newdecl
);
1878 /* Discard the old built-in function. */
1882 if (DECL_INITIAL (newdecl
))
1884 if (DECL_INITIAL (olddecl
))
1886 /* If both decls are in the same TU and the new declaration
1887 isn't overriding an extern inline reject the new decl.
1888 In c99, no overriding is allowed in the same translation
1890 if ((!DECL_EXTERN_INLINE (olddecl
)
1891 || DECL_EXTERN_INLINE (newdecl
)
1892 || (!flag_gnu89_inline
1893 && (!DECL_DECLARED_INLINE_P (olddecl
)
1894 || !lookup_attribute ("gnu_inline",
1895 DECL_ATTRIBUTES (olddecl
)))
1896 && (!DECL_DECLARED_INLINE_P (newdecl
)
1897 || !lookup_attribute ("gnu_inline",
1898 DECL_ATTRIBUTES (newdecl
))))
1900 && same_translation_unit_p (newdecl
, olddecl
))
1902 error ("redefinition of %q+D", newdecl
);
1903 locate_old_decl (olddecl
);
1908 /* If we have a prototype after an old-style function definition,
1909 the argument types must be checked specially. */
1910 else if (DECL_INITIAL (olddecl
)
1911 && !prototype_p (oldtype
) && prototype_p (newtype
)
1912 && TYPE_ACTUAL_ARG_TYPES (oldtype
)
1913 && !validate_proto_after_old_defn (newdecl
, newtype
, oldtype
))
1915 locate_old_decl (olddecl
);
1918 /* A non-static declaration (even an "extern") followed by a
1919 static declaration is undefined behavior per C99 6.2.2p3-5,7.
1920 The same is true for a static forward declaration at block
1921 scope followed by a non-static declaration/definition at file
1922 scope. Static followed by non-static at the same scope is
1923 not undefined behavior, and is the most convenient way to get
1924 some effects (see e.g. what unwind-dw2-fde-glibc.c does to
1925 the definition of _Unwind_Find_FDE in unwind-dw2-fde.c), but
1926 we do diagnose it if -Wtraditional. */
1927 if (TREE_PUBLIC (olddecl
) && !TREE_PUBLIC (newdecl
))
1929 /* Two exceptions to the rule. If olddecl is an extern
1930 inline, or a predeclared function that isn't actually
1931 built in, newdecl silently overrides olddecl. The latter
1932 occur only in Objective C; see also above. (FIXME: Make
1933 Objective C use normal builtins.) */
1934 if (!DECL_IS_BUILTIN (olddecl
)
1935 && !DECL_EXTERN_INLINE (olddecl
))
1937 error ("static declaration of %q+D follows "
1938 "non-static declaration", newdecl
);
1939 locate_old_decl (olddecl
);
1943 else if (TREE_PUBLIC (newdecl
) && !TREE_PUBLIC (olddecl
))
1945 if (DECL_CONTEXT (olddecl
))
1947 error ("non-static declaration of %q+D follows "
1948 "static declaration", newdecl
);
1949 locate_old_decl (olddecl
);
1952 else if (warn_traditional
)
1954 warned
|= warning (OPT_Wtraditional
,
1955 "non-static declaration of %q+D "
1956 "follows static declaration", newdecl
);
1960 /* Make sure gnu_inline attribute is either not present, or
1961 present on all inline decls. */
1962 if (DECL_DECLARED_INLINE_P (olddecl
)
1963 && DECL_DECLARED_INLINE_P (newdecl
))
1965 bool newa
= lookup_attribute ("gnu_inline",
1966 DECL_ATTRIBUTES (newdecl
)) != NULL
;
1967 bool olda
= lookup_attribute ("gnu_inline",
1968 DECL_ATTRIBUTES (olddecl
)) != NULL
;
1971 error_at (input_location
, "%<gnu_inline%> attribute present on %q+D",
1972 newa
? newdecl
: olddecl
);
1973 error_at (DECL_SOURCE_LOCATION (newa
? olddecl
: newdecl
),
1978 else if (TREE_CODE (newdecl
) == VAR_DECL
)
1980 /* Only variables can be thread-local, and all declarations must
1981 agree on this property. */
1982 if (C_DECL_THREADPRIVATE_P (olddecl
) && !DECL_THREAD_LOCAL_P (newdecl
))
1984 /* Nothing to check. Since OLDDECL is marked threadprivate
1985 and NEWDECL does not have a thread-local attribute, we
1986 will merge the threadprivate attribute into NEWDECL. */
1989 else if (DECL_THREAD_LOCAL_P (newdecl
) != DECL_THREAD_LOCAL_P (olddecl
))
1991 if (DECL_THREAD_LOCAL_P (newdecl
))
1992 error ("thread-local declaration of %q+D follows "
1993 "non-thread-local declaration", newdecl
);
1995 error ("non-thread-local declaration of %q+D follows "
1996 "thread-local declaration", newdecl
);
1998 locate_old_decl (olddecl
);
2002 /* Multiple initialized definitions are not allowed (6.9p3,5). */
2003 if (DECL_INITIAL (newdecl
) && DECL_INITIAL (olddecl
))
2005 error ("redefinition of %q+D", newdecl
);
2006 locate_old_decl (olddecl
);
2010 /* Objects declared at file scope: if the first declaration had
2011 external linkage (even if it was an external reference) the
2012 second must have external linkage as well, or the behavior is
2013 undefined. If the first declaration had internal linkage, then
2014 the second must too, or else be an external reference (in which
2015 case the composite declaration still has internal linkage).
2016 As for function declarations, we warn about the static-then-
2017 extern case only for -Wtraditional. See generally 6.2.2p3-5,7. */
2018 if (DECL_FILE_SCOPE_P (newdecl
)
2019 && TREE_PUBLIC (newdecl
) != TREE_PUBLIC (olddecl
))
2021 if (DECL_EXTERNAL (newdecl
))
2023 if (!DECL_FILE_SCOPE_P (olddecl
))
2025 error ("extern declaration of %q+D follows "
2026 "declaration with no linkage", newdecl
);
2027 locate_old_decl (olddecl
);
2030 else if (warn_traditional
)
2032 warned
|= warning (OPT_Wtraditional
,
2033 "non-static declaration of %q+D "
2034 "follows static declaration", newdecl
);
2039 if (TREE_PUBLIC (newdecl
))
2040 error ("non-static declaration of %q+D follows "
2041 "static declaration", newdecl
);
2043 error ("static declaration of %q+D follows "
2044 "non-static declaration", newdecl
);
2046 locate_old_decl (olddecl
);
2050 /* Two objects with the same name declared at the same block
2051 scope must both be external references (6.7p3). */
2052 else if (!DECL_FILE_SCOPE_P (newdecl
))
2054 if (DECL_EXTERNAL (newdecl
))
2056 /* Extern with initializer at block scope, which will
2057 already have received an error. */
2059 else if (DECL_EXTERNAL (olddecl
))
2061 error ("declaration of %q+D with no linkage follows "
2062 "extern declaration", newdecl
);
2063 locate_old_decl (olddecl
);
2067 error ("redeclaration of %q+D with no linkage", newdecl
);
2068 locate_old_decl (olddecl
);
2074 /* C++ does not permit a decl to appear multiple times at file
2077 && DECL_FILE_SCOPE_P (newdecl
)
2078 && !DECL_EXTERNAL (newdecl
)
2079 && !DECL_EXTERNAL (olddecl
))
2080 warned
|= warning_at (DECL_SOURCE_LOCATION (newdecl
),
2082 ("duplicate declaration of %qD is "
2088 /* All decls must agree on a visibility. */
2089 if (CODE_CONTAINS_STRUCT (TREE_CODE (newdecl
), TS_DECL_WITH_VIS
)
2090 && DECL_VISIBILITY_SPECIFIED (newdecl
) && DECL_VISIBILITY_SPECIFIED (olddecl
)
2091 && DECL_VISIBILITY (newdecl
) != DECL_VISIBILITY (olddecl
))
2093 warned
|= warning (0, "redeclaration of %q+D with different visibility "
2094 "(old visibility preserved)", newdecl
);
2097 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2099 /* Diagnose inline __attribute__ ((noinline)) which is silly. */
2100 if (DECL_DECLARED_INLINE_P (newdecl
)
2101 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl
)))
2103 warned
|= warning (OPT_Wattributes
,
2104 "inline declaration of %qD follows "
2105 "declaration with attribute noinline", newdecl
);
2107 else if (DECL_DECLARED_INLINE_P (olddecl
)
2108 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl
)))
2110 warned
|= warning (OPT_Wattributes
,
2111 "declaration of %q+D with attribute "
2112 "noinline follows inline declaration ", newdecl
);
2115 else /* PARM_DECL, VAR_DECL */
2117 /* Redeclaration of a parameter is a constraint violation (this is
2118 not explicitly stated, but follows from C99 6.7p3 [no more than
2119 one declaration of the same identifier with no linkage in the
2120 same scope, except type tags] and 6.2.2p6 [parameters have no
2121 linkage]). We must check for a forward parameter declaration,
2122 indicated by TREE_ASM_WRITTEN on the old declaration - this is
2123 an extension, the mandatory diagnostic for which is handled by
2124 mark_forward_parm_decls. */
2126 if (TREE_CODE (newdecl
) == PARM_DECL
2127 && (!TREE_ASM_WRITTEN (olddecl
) || TREE_ASM_WRITTEN (newdecl
)))
2129 error ("redefinition of parameter %q+D", newdecl
);
2130 locate_old_decl (olddecl
);
2135 /* Optional warning for completely redundant decls. */
2136 if (!warned
&& !pedwarned
2137 && warn_redundant_decls
2138 /* Don't warn about a function declaration followed by a
2140 && !(TREE_CODE (newdecl
) == FUNCTION_DECL
2141 && DECL_INITIAL (newdecl
) && !DECL_INITIAL (olddecl
))
2142 /* Don't warn about redundant redeclarations of builtins. */
2143 && !(TREE_CODE (newdecl
) == FUNCTION_DECL
2144 && !DECL_BUILT_IN (newdecl
)
2145 && DECL_BUILT_IN (olddecl
)
2146 && !C_DECL_DECLARED_BUILTIN (olddecl
))
2147 /* Don't warn about an extern followed by a definition. */
2148 && !(DECL_EXTERNAL (olddecl
) && !DECL_EXTERNAL (newdecl
))
2149 /* Don't warn about forward parameter decls. */
2150 && !(TREE_CODE (newdecl
) == PARM_DECL
2151 && TREE_ASM_WRITTEN (olddecl
) && !TREE_ASM_WRITTEN (newdecl
))
2152 /* Don't warn about a variable definition following a declaration. */
2153 && !(TREE_CODE (newdecl
) == VAR_DECL
2154 && DECL_INITIAL (newdecl
) && !DECL_INITIAL (olddecl
)))
2156 warned
= warning (OPT_Wredundant_decls
, "redundant redeclaration of %q+D",
2160 /* Report location of previous decl/defn. */
2161 if (warned
|| pedwarned
)
2162 locate_old_decl (olddecl
);
2164 #undef DECL_EXTERN_INLINE
2169 /* Subroutine of duplicate_decls. NEWDECL has been found to be
2170 consistent with OLDDECL, but carries new information. Merge the
2171 new information into OLDDECL. This function issues no
2175 merge_decls (tree newdecl
, tree olddecl
, tree newtype
, tree oldtype
)
2177 bool new_is_definition
= (TREE_CODE (newdecl
) == FUNCTION_DECL
2178 && DECL_INITIAL (newdecl
) != 0);
2179 bool new_is_prototype
= (TREE_CODE (newdecl
) == FUNCTION_DECL
2180 && prototype_p (TREE_TYPE (newdecl
)));
2181 bool old_is_prototype
= (TREE_CODE (olddecl
) == FUNCTION_DECL
2182 && prototype_p (TREE_TYPE (olddecl
)));
2184 /* For real parm decl following a forward decl, rechain the old decl
2185 in its new location and clear TREE_ASM_WRITTEN (it's not a
2186 forward decl anymore). */
2187 if (TREE_CODE (newdecl
) == PARM_DECL
2188 && TREE_ASM_WRITTEN (olddecl
) && !TREE_ASM_WRITTEN (newdecl
))
2190 struct c_binding
*b
, **here
;
2192 for (here
= ¤t_scope
->bindings
; *here
; here
= &(*here
)->prev
)
2193 if ((*here
)->decl
== olddecl
)
2200 b
->prev
= current_scope
->bindings
;
2201 current_scope
->bindings
= b
;
2203 TREE_ASM_WRITTEN (olddecl
) = 0;
2206 DECL_ATTRIBUTES (newdecl
)
2207 = targetm
.merge_decl_attributes (olddecl
, newdecl
);
2209 /* Merge the data types specified in the two decls. */
2211 = TREE_TYPE (olddecl
)
2212 = composite_type (newtype
, oldtype
);
2214 /* Lay the type out, unless already done. */
2215 if (!comptypes (oldtype
, TREE_TYPE (newdecl
)))
2217 if (TREE_TYPE (newdecl
) != error_mark_node
)
2218 layout_type (TREE_TYPE (newdecl
));
2219 if (TREE_CODE (newdecl
) != FUNCTION_DECL
2220 && TREE_CODE (newdecl
) != TYPE_DECL
2221 && TREE_CODE (newdecl
) != CONST_DECL
)
2222 layout_decl (newdecl
, 0);
2226 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
2227 DECL_SIZE (newdecl
) = DECL_SIZE (olddecl
);
2228 DECL_SIZE_UNIT (newdecl
) = DECL_SIZE_UNIT (olddecl
);
2229 DECL_MODE (newdecl
) = DECL_MODE (olddecl
);
2230 if (DECL_ALIGN (olddecl
) > DECL_ALIGN (newdecl
))
2232 DECL_ALIGN (newdecl
) = DECL_ALIGN (olddecl
);
2233 DECL_USER_ALIGN (newdecl
) |= DECL_USER_ALIGN (olddecl
);
2237 /* Keep the old rtl since we can safely use it. */
2238 if (HAS_RTL_P (olddecl
))
2239 COPY_DECL_RTL (olddecl
, newdecl
);
2241 /* Merge the type qualifiers. */
2242 if (TREE_READONLY (newdecl
))
2243 TREE_READONLY (olddecl
) = 1;
2245 if (TREE_THIS_VOLATILE (newdecl
))
2246 TREE_THIS_VOLATILE (olddecl
) = 1;
2248 /* Merge deprecatedness. */
2249 if (TREE_DEPRECATED (newdecl
))
2250 TREE_DEPRECATED (olddecl
) = 1;
2252 /* If a decl is in a system header and the other isn't, keep the one on the
2253 system header. Otherwise, keep source location of definition rather than
2254 declaration and of prototype rather than non-prototype unless that
2255 prototype is built-in. */
2256 if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl
), TS_DECL_WITH_VIS
)
2257 && DECL_IN_SYSTEM_HEADER (olddecl
)
2258 && !DECL_IN_SYSTEM_HEADER (newdecl
) )
2259 DECL_SOURCE_LOCATION (newdecl
) = DECL_SOURCE_LOCATION (olddecl
);
2260 else if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl
), TS_DECL_WITH_VIS
)
2261 && DECL_IN_SYSTEM_HEADER (newdecl
)
2262 && !DECL_IN_SYSTEM_HEADER (olddecl
))
2263 DECL_SOURCE_LOCATION (olddecl
) = DECL_SOURCE_LOCATION (newdecl
);
2264 else if ((DECL_INITIAL (newdecl
) == 0 && DECL_INITIAL (olddecl
) != 0)
2265 || (old_is_prototype
&& !new_is_prototype
2266 && !C_DECL_BUILTIN_PROTOTYPE (olddecl
)))
2267 DECL_SOURCE_LOCATION (newdecl
) = DECL_SOURCE_LOCATION (olddecl
);
2269 /* Merge the initialization information. */
2270 if (DECL_INITIAL (newdecl
) == 0)
2271 DECL_INITIAL (newdecl
) = DECL_INITIAL (olddecl
);
2273 /* Merge the threadprivate attribute. */
2274 if (TREE_CODE (olddecl
) == VAR_DECL
&& C_DECL_THREADPRIVATE_P (olddecl
))
2276 DECL_TLS_MODEL (newdecl
) = DECL_TLS_MODEL (olddecl
);
2277 C_DECL_THREADPRIVATE_P (newdecl
) = 1;
2280 if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl
), TS_DECL_WITH_VIS
))
2282 /* Merge the section attribute.
2283 We want to issue an error if the sections conflict but that
2284 must be done later in decl_attributes since we are called
2285 before attributes are assigned. */
2286 if (DECL_SECTION_NAME (newdecl
) == NULL_TREE
)
2287 DECL_SECTION_NAME (newdecl
) = DECL_SECTION_NAME (olddecl
);
2289 /* Copy the assembler name.
2290 Currently, it can only be defined in the prototype. */
2291 COPY_DECL_ASSEMBLER_NAME (olddecl
, newdecl
);
2293 /* Use visibility of whichever declaration had it specified */
2294 if (DECL_VISIBILITY_SPECIFIED (olddecl
))
2296 DECL_VISIBILITY (newdecl
) = DECL_VISIBILITY (olddecl
);
2297 DECL_VISIBILITY_SPECIFIED (newdecl
) = 1;
2300 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2302 DECL_STATIC_CONSTRUCTOR(newdecl
) |= DECL_STATIC_CONSTRUCTOR(olddecl
);
2303 DECL_STATIC_DESTRUCTOR (newdecl
) |= DECL_STATIC_DESTRUCTOR (olddecl
);
2304 DECL_NO_LIMIT_STACK (newdecl
) |= DECL_NO_LIMIT_STACK (olddecl
);
2305 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl
)
2306 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl
);
2307 TREE_THIS_VOLATILE (newdecl
) |= TREE_THIS_VOLATILE (olddecl
);
2308 DECL_IS_MALLOC (newdecl
) |= DECL_IS_MALLOC (olddecl
);
2309 DECL_IS_OPERATOR_NEW (newdecl
) |= DECL_IS_OPERATOR_NEW (olddecl
);
2310 TREE_READONLY (newdecl
) |= TREE_READONLY (olddecl
);
2311 DECL_PURE_P (newdecl
) |= DECL_PURE_P (olddecl
);
2312 DECL_IS_NOVOPS (newdecl
) |= DECL_IS_NOVOPS (olddecl
);
2315 /* Merge the storage class information. */
2316 merge_weak (newdecl
, olddecl
);
2318 /* For functions, static overrides non-static. */
2319 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2321 TREE_PUBLIC (newdecl
) &= TREE_PUBLIC (olddecl
);
2322 /* This is since we don't automatically
2323 copy the attributes of NEWDECL into OLDDECL. */
2324 TREE_PUBLIC (olddecl
) = TREE_PUBLIC (newdecl
);
2325 /* If this clears `static', clear it in the identifier too. */
2326 if (!TREE_PUBLIC (olddecl
))
2327 TREE_PUBLIC (DECL_NAME (olddecl
)) = 0;
2331 /* In c99, 'extern' declaration before (or after) 'inline' means this
2332 function is not DECL_EXTERNAL, unless 'gnu_inline' attribute
2334 if (TREE_CODE (newdecl
) == FUNCTION_DECL
2335 && !flag_gnu89_inline
2336 && (DECL_DECLARED_INLINE_P (newdecl
)
2337 || DECL_DECLARED_INLINE_P (olddecl
))
2338 && (!DECL_DECLARED_INLINE_P (newdecl
)
2339 || !DECL_DECLARED_INLINE_P (olddecl
)
2340 || !DECL_EXTERNAL (olddecl
))
2341 && DECL_EXTERNAL (newdecl
)
2342 && !lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (newdecl
))
2343 && !current_function_decl
)
2344 DECL_EXTERNAL (newdecl
) = 0;
2346 if (DECL_EXTERNAL (newdecl
))
2348 TREE_STATIC (newdecl
) = TREE_STATIC (olddecl
);
2349 DECL_EXTERNAL (newdecl
) = DECL_EXTERNAL (olddecl
);
2351 /* An extern decl does not override previous storage class. */
2352 TREE_PUBLIC (newdecl
) = TREE_PUBLIC (olddecl
);
2353 if (!DECL_EXTERNAL (newdecl
))
2355 DECL_CONTEXT (newdecl
) = DECL_CONTEXT (olddecl
);
2356 DECL_COMMON (newdecl
) = DECL_COMMON (olddecl
);
2361 TREE_STATIC (olddecl
) = TREE_STATIC (newdecl
);
2362 TREE_PUBLIC (olddecl
) = TREE_PUBLIC (newdecl
);
2365 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2367 /* If we're redefining a function previously defined as extern
2368 inline, make sure we emit debug info for the inline before we
2369 throw it away, in case it was inlined into a function that
2370 hasn't been written out yet. */
2371 if (new_is_definition
&& DECL_INITIAL (olddecl
))
2372 /* The new defn must not be inline. */
2373 DECL_UNINLINABLE (newdecl
) = 1;
2376 /* If either decl says `inline', this fn is inline, unless
2377 its definition was passed already. */
2378 if (DECL_DECLARED_INLINE_P (newdecl
)
2379 || DECL_DECLARED_INLINE_P (olddecl
))
2380 DECL_DECLARED_INLINE_P (newdecl
) = 1;
2382 DECL_UNINLINABLE (newdecl
) = DECL_UNINLINABLE (olddecl
)
2383 = (DECL_UNINLINABLE (newdecl
) || DECL_UNINLINABLE (olddecl
));
2385 DECL_DISREGARD_INLINE_LIMITS (newdecl
)
2386 = DECL_DISREGARD_INLINE_LIMITS (olddecl
)
2387 = (DECL_DISREGARD_INLINE_LIMITS (newdecl
)
2388 || DECL_DISREGARD_INLINE_LIMITS (olddecl
));
2391 if (DECL_BUILT_IN (olddecl
))
2393 /* If redeclaring a builtin function, it stays built in.
2394 But it gets tagged as having been declared. */
2395 DECL_BUILT_IN_CLASS (newdecl
) = DECL_BUILT_IN_CLASS (olddecl
);
2396 DECL_FUNCTION_CODE (newdecl
) = DECL_FUNCTION_CODE (olddecl
);
2397 C_DECL_DECLARED_BUILTIN (newdecl
) = 1;
2398 if (new_is_prototype
)
2400 C_DECL_BUILTIN_PROTOTYPE (newdecl
) = 0;
2401 if (DECL_BUILT_IN_CLASS (newdecl
) == BUILT_IN_NORMAL
)
2403 enum built_in_function fncode
= DECL_FUNCTION_CODE (newdecl
);
2406 /* If a compatible prototype of these builtin functions
2407 is seen, assume the runtime implements it with the
2408 expected semantics. */
2409 case BUILT_IN_STPCPY
:
2410 if (builtin_decl_explicit_p (fncode
))
2411 set_builtin_decl_implicit_p (fncode
, true);
2419 C_DECL_BUILTIN_PROTOTYPE (newdecl
)
2420 = C_DECL_BUILTIN_PROTOTYPE (olddecl
);
2423 /* Preserve function specific target and optimization options */
2424 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl
)
2425 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl
))
2426 DECL_FUNCTION_SPECIFIC_TARGET (newdecl
)
2427 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl
);
2429 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl
)
2430 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl
))
2431 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl
)
2432 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl
);
2434 /* Also preserve various other info from the definition. */
2435 if (!new_is_definition
)
2438 DECL_RESULT (newdecl
) = DECL_RESULT (olddecl
);
2439 DECL_INITIAL (newdecl
) = DECL_INITIAL (olddecl
);
2440 DECL_STRUCT_FUNCTION (newdecl
) = DECL_STRUCT_FUNCTION (olddecl
);
2441 DECL_SAVED_TREE (newdecl
) = DECL_SAVED_TREE (olddecl
);
2442 DECL_ARGUMENTS (newdecl
) = copy_list (DECL_ARGUMENTS (olddecl
));
2443 for (t
= DECL_ARGUMENTS (newdecl
); t
; t
= DECL_CHAIN (t
))
2444 DECL_CONTEXT (t
) = newdecl
;
2446 /* See if we've got a function to instantiate from. */
2447 if (DECL_SAVED_TREE (olddecl
))
2448 DECL_ABSTRACT_ORIGIN (newdecl
)
2449 = DECL_ABSTRACT_ORIGIN (olddecl
);
2453 /* Merge the USED information. */
2454 if (TREE_USED (olddecl
))
2455 TREE_USED (newdecl
) = 1;
2456 else if (TREE_USED (newdecl
))
2457 TREE_USED (olddecl
) = 1;
2458 if (TREE_CODE (olddecl
) == VAR_DECL
|| TREE_CODE (olddecl
) == PARM_DECL
)
2459 DECL_READ_P (newdecl
) |= DECL_READ_P (olddecl
);
2460 if (DECL_PRESERVE_P (olddecl
))
2461 DECL_PRESERVE_P (newdecl
) = 1;
2462 else if (DECL_PRESERVE_P (newdecl
))
2463 DECL_PRESERVE_P (olddecl
) = 1;
2465 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
2466 But preserve OLDDECL's DECL_UID, DECL_CONTEXT and
2467 DECL_ARGUMENTS (if appropriate). */
2469 unsigned olddecl_uid
= DECL_UID (olddecl
);
2470 tree olddecl_context
= DECL_CONTEXT (olddecl
);
2471 tree olddecl_arguments
= NULL
;
2472 if (TREE_CODE (olddecl
) == FUNCTION_DECL
)
2473 olddecl_arguments
= DECL_ARGUMENTS (olddecl
);
2475 memcpy ((char *) olddecl
+ sizeof (struct tree_common
),
2476 (char *) newdecl
+ sizeof (struct tree_common
),
2477 sizeof (struct tree_decl_common
) - sizeof (struct tree_common
));
2478 DECL_USER_ALIGN (olddecl
) = DECL_USER_ALIGN (newdecl
);
2479 switch (TREE_CODE (olddecl
))
2489 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
2490 (char *) newdecl
+ sizeof (struct tree_decl_common
),
2491 tree_code_size (TREE_CODE (olddecl
)) - sizeof (struct tree_decl_common
));
2496 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
2497 (char *) newdecl
+ sizeof (struct tree_decl_common
),
2498 sizeof (struct tree_decl_non_common
) - sizeof (struct tree_decl_common
));
2500 DECL_UID (olddecl
) = olddecl_uid
;
2501 DECL_CONTEXT (olddecl
) = olddecl_context
;
2502 if (TREE_CODE (olddecl
) == FUNCTION_DECL
)
2503 DECL_ARGUMENTS (olddecl
) = olddecl_arguments
;
2506 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2507 so that encode_section_info has a chance to look at the new decl
2508 flags and attributes. */
2509 if (DECL_RTL_SET_P (olddecl
)
2510 && (TREE_CODE (olddecl
) == FUNCTION_DECL
2511 || (TREE_CODE (olddecl
) == VAR_DECL
2512 && TREE_STATIC (olddecl
))))
2513 make_decl_rtl (olddecl
);
2516 /* Handle when a new declaration NEWDECL has the same name as an old
2517 one OLDDECL in the same binding contour. Prints an error message
2520 If safely possible, alter OLDDECL to look like NEWDECL, and return
2521 true. Otherwise, return false. */
2524 duplicate_decls (tree newdecl
, tree olddecl
)
2526 tree newtype
= NULL
, oldtype
= NULL
;
2528 if (!diagnose_mismatched_decls (newdecl
, olddecl
, &newtype
, &oldtype
))
2530 /* Avoid `unused variable' and other warnings for OLDDECL. */
2531 TREE_NO_WARNING (olddecl
) = 1;
2535 merge_decls (newdecl
, olddecl
, newtype
, oldtype
);
2540 /* Check whether decl-node NEW_DECL shadows an existing declaration. */
2542 warn_if_shadowing (tree new_decl
)
2544 struct c_binding
*b
;
2546 /* Shadow warnings wanted? */
2548 /* No shadow warnings for internally generated vars. */
2549 || DECL_IS_BUILTIN (new_decl
)
2550 /* No shadow warnings for vars made for inlining. */
2551 || DECL_FROM_INLINE (new_decl
))
2554 /* Is anything being shadowed? Invisible decls do not count. */
2555 for (b
= I_SYMBOL_BINDING (DECL_NAME (new_decl
)); b
; b
= b
->shadowed
)
2556 if (b
->decl
&& b
->decl
!= new_decl
&& !b
->invisible
2557 && (b
->decl
== error_mark_node
2558 || diagnostic_report_warnings_p (global_dc
,
2559 DECL_SOURCE_LOCATION (b
->decl
))))
2561 tree old_decl
= b
->decl
;
2563 if (old_decl
== error_mark_node
)
2565 warning (OPT_Wshadow
, "declaration of %q+D shadows previous "
2566 "non-variable", new_decl
);
2569 else if (TREE_CODE (old_decl
) == PARM_DECL
)
2570 warning (OPT_Wshadow
, "declaration of %q+D shadows a parameter",
2572 else if (DECL_FILE_SCOPE_P (old_decl
))
2574 /* Do not warn if a variable shadows a function, unless
2575 the variable is a function or a pointer-to-function. */
2576 if (TREE_CODE (old_decl
) == FUNCTION_DECL
2577 && TREE_CODE (new_decl
) != FUNCTION_DECL
2578 && !FUNCTION_POINTER_TYPE_P (TREE_TYPE (new_decl
)))
2581 warning_at (DECL_SOURCE_LOCATION (new_decl
), OPT_Wshadow
,
2582 "declaration of %qD shadows a global declaration",
2585 else if (TREE_CODE (old_decl
) == FUNCTION_DECL
2586 && DECL_BUILT_IN (old_decl
))
2588 warning (OPT_Wshadow
, "declaration of %q+D shadows "
2589 "a built-in function", new_decl
);
2593 warning (OPT_Wshadow
, "declaration of %q+D shadows a previous local",
2596 warning_at (DECL_SOURCE_LOCATION (old_decl
), OPT_Wshadow
,
2597 "shadowed declaration is here");
2603 /* Record a decl-node X as belonging to the current lexical scope.
2604 Check for errors (such as an incompatible declaration for the same
2605 name already seen in the same scope).
2607 Returns either X or an old decl for the same name.
2608 If an old decl is returned, it may have been smashed
2609 to agree with what X says. */
2614 tree name
= DECL_NAME (x
);
2615 struct c_scope
*scope
= current_scope
;
2616 struct c_binding
*b
;
2617 bool nested
= false;
2618 location_t locus
= DECL_SOURCE_LOCATION (x
);
2620 /* Must set DECL_CONTEXT for everything not at file scope or
2621 DECL_FILE_SCOPE_P won't work. Local externs don't count
2622 unless they have initializers (which generate code). */
2623 if (current_function_decl
2624 && ((TREE_CODE (x
) != FUNCTION_DECL
&& TREE_CODE (x
) != VAR_DECL
)
2625 || DECL_INITIAL (x
) || !DECL_EXTERNAL (x
)))
2626 DECL_CONTEXT (x
) = current_function_decl
;
2628 /* Anonymous decls are just inserted in the scope. */
2631 bind (name
, x
, scope
, /*invisible=*/false, /*nested=*/false,
2636 /* First, see if there is another declaration with the same name in
2637 the current scope. If there is, duplicate_decls may do all the
2638 work for us. If duplicate_decls returns false, that indicates
2639 two incompatible decls in the same scope; we are to silently
2640 replace the old one (duplicate_decls has issued all appropriate
2641 diagnostics). In particular, we should not consider possible
2642 duplicates in the external scope, or shadowing. */
2643 b
= I_SYMBOL_BINDING (name
);
2644 if (b
&& B_IN_SCOPE (b
, scope
))
2646 struct c_binding
*b_ext
, *b_use
;
2647 tree type
= TREE_TYPE (x
);
2648 tree visdecl
= b
->decl
;
2649 tree vistype
= TREE_TYPE (visdecl
);
2650 if (TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
2651 && COMPLETE_TYPE_P (TREE_TYPE (x
)))
2652 b
->inner_comp
= false;
2655 /* If this is an external linkage declaration, we should check
2656 for compatibility with the type in the external scope before
2657 setting the type at this scope based on the visible
2658 information only. */
2659 if (TREE_PUBLIC (x
) && TREE_PUBLIC (visdecl
))
2661 while (b_ext
&& !B_IN_EXTERNAL_SCOPE (b_ext
))
2662 b_ext
= b_ext
->shadowed
;
2667 TREE_TYPE (b_use
->decl
) = b_use
->u
.type
;
2670 if (duplicate_decls (x
, b_use
->decl
))
2674 /* Save the updated type in the external scope and
2675 restore the proper type for this scope. */
2677 if (comptypes (vistype
, type
))
2678 thistype
= composite_type (vistype
, type
);
2680 thistype
= TREE_TYPE (b_use
->decl
);
2681 b_use
->u
.type
= TREE_TYPE (b_use
->decl
);
2682 if (TREE_CODE (b_use
->decl
) == FUNCTION_DECL
2683 && DECL_BUILT_IN (b_use
->decl
))
2685 = build_type_attribute_variant (thistype
,
2688 TREE_TYPE (b_use
->decl
) = thistype
;
2693 goto skip_external_and_shadow_checks
;
2696 /* All declarations with external linkage, and all external
2697 references, go in the external scope, no matter what scope is
2698 current. However, the binding in that scope is ignored for
2699 purposes of normal name lookup. A separate binding structure is
2700 created in the requested scope; this governs the normal
2701 visibility of the symbol.
2703 The binding in the externals scope is used exclusively for
2704 detecting duplicate declarations of the same object, no matter
2705 what scope they are in; this is what we do here. (C99 6.2.7p2:
2706 All declarations that refer to the same object or function shall
2707 have compatible type; otherwise, the behavior is undefined.) */
2708 if (DECL_EXTERNAL (x
) || scope
== file_scope
)
2710 tree type
= TREE_TYPE (x
);
2713 bool type_saved
= false;
2714 if (b
&& !B_IN_EXTERNAL_SCOPE (b
)
2715 && (TREE_CODE (b
->decl
) == FUNCTION_DECL
2716 || TREE_CODE (b
->decl
) == VAR_DECL
)
2717 && DECL_FILE_SCOPE_P (b
->decl
))
2720 vistype
= TREE_TYPE (visdecl
);
2722 if (scope
!= file_scope
2723 && !DECL_IN_SYSTEM_HEADER (x
))
2724 warning (OPT_Wnested_externs
, "nested extern declaration of %qD", x
);
2726 while (b
&& !B_IN_EXTERNAL_SCOPE (b
))
2728 /* If this decl might be modified, save its type. This is
2729 done here rather than when the decl is first bound
2730 because the type may change after first binding, through
2731 being completed or through attributes being added. If we
2732 encounter multiple such decls, only the first should have
2733 its type saved; the others will already have had their
2734 proper types saved and the types will not have changed as
2735 their scopes will not have been re-entered. */
2736 if (DECL_P (b
->decl
) && DECL_FILE_SCOPE_P (b
->decl
) && !type_saved
)
2738 b
->u
.type
= TREE_TYPE (b
->decl
);
2741 if (B_IN_FILE_SCOPE (b
)
2742 && TREE_CODE (b
->decl
) == VAR_DECL
2743 && TREE_STATIC (b
->decl
)
2744 && TREE_CODE (TREE_TYPE (b
->decl
)) == ARRAY_TYPE
2745 && !TYPE_DOMAIN (TREE_TYPE (b
->decl
))
2746 && TREE_CODE (type
) == ARRAY_TYPE
2747 && TYPE_DOMAIN (type
)
2748 && TYPE_MAX_VALUE (TYPE_DOMAIN (type
))
2749 && !integer_zerop (TYPE_MAX_VALUE (TYPE_DOMAIN (type
))))
2751 /* Array type completed in inner scope, which should be
2752 diagnosed if the completion does not have size 1 and
2753 it does not get completed in the file scope. */
2754 b
->inner_comp
= true;
2759 /* If a matching external declaration has been found, set its
2760 type to the composite of all the types of that declaration.
2761 After the consistency checks, it will be reset to the
2762 composite of the visible types only. */
2763 if (b
&& (TREE_PUBLIC (x
) || same_translation_unit_p (x
, b
->decl
))
2765 TREE_TYPE (b
->decl
) = b
->u
.type
;
2767 /* The point of the same_translation_unit_p check here is,
2768 we want to detect a duplicate decl for a construct like
2769 foo() { extern bar(); } ... static bar(); but not if
2770 they are in different translation units. In any case,
2771 the static does not go in the externals scope. */
2773 && (TREE_PUBLIC (x
) || same_translation_unit_p (x
, b
->decl
))
2774 && duplicate_decls (x
, b
->decl
))
2779 if (comptypes (vistype
, type
))
2780 thistype
= composite_type (vistype
, type
);
2782 thistype
= TREE_TYPE (b
->decl
);
2786 b
->u
.type
= TREE_TYPE (b
->decl
);
2787 if (TREE_CODE (b
->decl
) == FUNCTION_DECL
&& DECL_BUILT_IN (b
->decl
))
2789 = build_type_attribute_variant (thistype
,
2790 TYPE_ATTRIBUTES (b
->u
.type
));
2791 TREE_TYPE (b
->decl
) = thistype
;
2792 bind (name
, b
->decl
, scope
, /*invisible=*/false, /*nested=*/true,
2796 else if (TREE_PUBLIC (x
))
2798 if (visdecl
&& !b
&& duplicate_decls (x
, visdecl
))
2800 /* An external declaration at block scope referring to a
2801 visible entity with internal linkage. The composite
2802 type will already be correct for this scope, so we
2803 just need to fall through to make the declaration in
2810 bind (name
, x
, external_scope
, /*invisible=*/true,
2811 /*nested=*/false, locus
);
2817 if (TREE_CODE (x
) != PARM_DECL
)
2818 warn_if_shadowing (x
);
2820 skip_external_and_shadow_checks
:
2821 if (TREE_CODE (x
) == TYPE_DECL
)
2823 /* So this is a typedef, set its underlying type. */
2824 set_underlying_type (x
);
2826 /* If X is a typedef defined in the current function, record it
2827 for the purpose of implementing the -Wunused-local-typedefs
2829 record_locally_defined_typedef (x
);
2832 bind (name
, x
, scope
, /*invisible=*/false, nested
, locus
);
2834 /* If x's type is incomplete because it's based on a
2835 structure or union which has not yet been fully declared,
2836 attach it to that structure or union type, so we can go
2837 back and complete the variable declaration later, if the
2838 structure or union gets fully declared.
2840 If the input is erroneous, we can have error_mark in the type
2841 slot (e.g. "f(void a, ...)") - that doesn't count as an
2843 if (TREE_TYPE (x
) != error_mark_node
2844 && !COMPLETE_TYPE_P (TREE_TYPE (x
)))
2846 tree element
= TREE_TYPE (x
);
2848 while (TREE_CODE (element
) == ARRAY_TYPE
)
2849 element
= TREE_TYPE (element
);
2850 element
= TYPE_MAIN_VARIANT (element
);
2852 if ((TREE_CODE (element
) == RECORD_TYPE
2853 || TREE_CODE (element
) == UNION_TYPE
)
2854 && (TREE_CODE (x
) != TYPE_DECL
2855 || TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
)
2856 && !COMPLETE_TYPE_P (element
))
2857 C_TYPE_INCOMPLETE_VARS (element
)
2858 = tree_cons (NULL_TREE
, x
, C_TYPE_INCOMPLETE_VARS (element
));
2863 /* Record X as belonging to file scope.
2864 This is used only internally by the Objective-C front end,
2865 and is limited to its needs. duplicate_decls is not called;
2866 if there is any preexisting decl for this identifier, it is an ICE. */
2869 pushdecl_top_level (tree x
)
2872 bool nested
= false;
2873 gcc_assert (TREE_CODE (x
) == VAR_DECL
|| TREE_CODE (x
) == CONST_DECL
);
2875 name
= DECL_NAME (x
);
2877 gcc_assert (TREE_CODE (x
) == CONST_DECL
|| !I_SYMBOL_BINDING (name
));
2879 if (TREE_PUBLIC (x
))
2881 bind (name
, x
, external_scope
, /*invisible=*/true, /*nested=*/false,
2886 bind (name
, x
, file_scope
, /*invisible=*/false, nested
, UNKNOWN_LOCATION
);
2892 implicit_decl_warning (tree id
, tree olddecl
)
2894 if (warn_implicit_function_declaration
)
2899 warned
= pedwarn (input_location
, OPT_Wimplicit_function_declaration
,
2900 "implicit declaration of function %qE", id
);
2902 warned
= warning (OPT_Wimplicit_function_declaration
,
2903 G_("implicit declaration of function %qE"), id
);
2904 if (olddecl
&& warned
)
2905 locate_old_decl (olddecl
);
2909 /* Generate an implicit declaration for identifier FUNCTIONID at LOC as a
2910 function of type int (). */
2913 implicitly_declare (location_t loc
, tree functionid
)
2915 struct c_binding
*b
;
2919 for (b
= I_SYMBOL_BINDING (functionid
); b
; b
= b
->shadowed
)
2921 if (B_IN_SCOPE (b
, external_scope
))
2930 if (decl
== error_mark_node
)
2933 /* FIXME: Objective-C has weird not-really-builtin functions
2934 which are supposed to be visible automatically. They wind up
2935 in the external scope because they're pushed before the file
2936 scope gets created. Catch this here and rebind them into the
2938 if (!DECL_BUILT_IN (decl
) && DECL_IS_BUILTIN (decl
))
2940 bind (functionid
, decl
, file_scope
,
2941 /*invisible=*/false, /*nested=*/true,
2942 DECL_SOURCE_LOCATION (decl
));
2947 tree newtype
= default_function_type
;
2949 TREE_TYPE (decl
) = b
->u
.type
;
2950 /* Implicit declaration of a function already declared
2951 (somehow) in a different scope, or as a built-in.
2952 If this is the first time this has happened, warn;
2953 then recycle the old declaration but with the new type. */
2954 if (!C_DECL_IMPLICIT (decl
))
2956 implicit_decl_warning (functionid
, decl
);
2957 C_DECL_IMPLICIT (decl
) = 1;
2959 if (DECL_BUILT_IN (decl
))
2961 newtype
= build_type_attribute_variant (newtype
,
2963 (TREE_TYPE (decl
)));
2964 if (!comptypes (newtype
, TREE_TYPE (decl
)))
2966 warning_at (loc
, 0, "incompatible implicit declaration of "
2967 "built-in function %qD", decl
);
2968 newtype
= TREE_TYPE (decl
);
2973 if (!comptypes (newtype
, TREE_TYPE (decl
)))
2975 error_at (loc
, "incompatible implicit declaration of function %qD", decl
);
2976 locate_old_decl (decl
);
2979 b
->u
.type
= TREE_TYPE (decl
);
2980 TREE_TYPE (decl
) = newtype
;
2981 bind (functionid
, decl
, current_scope
,
2982 /*invisible=*/false, /*nested=*/true,
2983 DECL_SOURCE_LOCATION (decl
));
2988 /* Not seen before. */
2989 decl
= build_decl (loc
, FUNCTION_DECL
, functionid
, default_function_type
);
2990 DECL_EXTERNAL (decl
) = 1;
2991 TREE_PUBLIC (decl
) = 1;
2992 C_DECL_IMPLICIT (decl
) = 1;
2993 implicit_decl_warning (functionid
, 0);
2994 asmspec_tree
= maybe_apply_renaming_pragma (decl
, /*asmname=*/NULL
);
2996 set_user_assembler_name (decl
, TREE_STRING_POINTER (asmspec_tree
));
2998 /* C89 says implicit declarations are in the innermost block.
2999 So we record the decl in the standard fashion. */
3000 decl
= pushdecl (decl
);
3002 /* No need to call objc_check_decl here - it's a function type. */
3003 rest_of_decl_compilation (decl
, 0, 0);
3005 /* Write a record describing this implicit function declaration
3006 to the prototypes file (if requested). */
3007 gen_aux_info_record (decl
, 0, 1, 0);
3009 /* Possibly apply some default attributes to this implicit declaration. */
3010 decl_attributes (&decl
, NULL_TREE
, 0);
3015 /* Issue an error message for a reference to an undeclared variable
3016 ID, including a reference to a builtin outside of function-call
3017 context. Establish a binding of the identifier to error_mark_node
3018 in an appropriate scope, which will suppress further errors for the
3019 same identifier. The error message should be given location LOC. */
3021 undeclared_variable (location_t loc
, tree id
)
3023 static bool already
= false;
3024 struct c_scope
*scope
;
3026 if (current_function_decl
== 0)
3028 error_at (loc
, "%qE undeclared here (not in a function)", id
);
3029 scope
= current_scope
;
3033 if (!objc_diagnose_private_ivar (id
))
3034 error_at (loc
, "%qE undeclared (first use in this function)", id
);
3037 inform (loc
, "each undeclared identifier is reported only"
3038 " once for each function it appears in");
3042 /* If we are parsing old-style parameter decls, current_function_decl
3043 will be nonnull but current_function_scope will be null. */
3044 scope
= current_function_scope
? current_function_scope
: current_scope
;
3046 bind (id
, error_mark_node
, scope
, /*invisible=*/false, /*nested=*/false,
3050 /* Subroutine of lookup_label, declare_label, define_label: construct a
3051 LABEL_DECL with all the proper frills. Also create a struct
3052 c_label_vars initialized for the current scope. */
3055 make_label (location_t location
, tree name
, bool defining
,
3056 struct c_label_vars
**p_label_vars
)
3058 tree label
= build_decl (location
, LABEL_DECL
, name
, void_type_node
);
3059 struct c_label_vars
*label_vars
;
3061 DECL_CONTEXT (label
) = current_function_decl
;
3062 DECL_MODE (label
) = VOIDmode
;
3064 label_vars
= ggc_alloc_c_label_vars ();
3065 label_vars
->shadowed
= NULL
;
3066 set_spot_bindings (&label_vars
->label_bindings
, defining
);
3067 label_vars
->decls_in_scope
= make_tree_vector ();
3068 label_vars
->gotos
= NULL
;
3069 *p_label_vars
= label_vars
;
3074 /* Get the LABEL_DECL corresponding to identifier NAME as a label.
3075 Create one if none exists so far for the current function.
3076 This is called when a label is used in a goto expression or
3077 has its address taken. */
3080 lookup_label (tree name
)
3083 struct c_label_vars
*label_vars
;
3085 if (current_function_scope
== 0)
3087 error ("label %qE referenced outside of any function", name
);
3091 /* Use a label already defined or ref'd with this name, but not if
3092 it is inherited from a containing function and wasn't declared
3094 label
= I_LABEL_DECL (name
);
3095 if (label
&& (DECL_CONTEXT (label
) == current_function_decl
3096 || C_DECLARED_LABEL_FLAG (label
)))
3098 /* If the label has only been declared, update its apparent
3099 location to point here, for better diagnostics if it
3100 turns out not to have been defined. */
3101 if (DECL_INITIAL (label
) == NULL_TREE
)
3102 DECL_SOURCE_LOCATION (label
) = input_location
;
3106 /* No label binding for that identifier; make one. */
3107 label
= make_label (input_location
, name
, false, &label_vars
);
3109 /* Ordinary labels go in the current function scope. */
3110 bind_label (name
, label
, current_function_scope
, label_vars
);
3115 /* Issue a warning about DECL for a goto statement at GOTO_LOC going
3119 warn_about_goto (location_t goto_loc
, tree label
, tree decl
)
3121 if (variably_modified_type_p (TREE_TYPE (decl
), NULL_TREE
))
3123 "jump into scope of identifier with variably modified type");
3125 warning_at (goto_loc
, OPT_Wjump_misses_init
,
3126 "jump skips variable initialization");
3127 inform (DECL_SOURCE_LOCATION (label
), "label %qD defined here", label
);
3128 inform (DECL_SOURCE_LOCATION (decl
), "%qD declared here", decl
);
3131 /* Look up a label because of a goto statement. This is like
3132 lookup_label, but also issues any appropriate warnings. */
3135 lookup_label_for_goto (location_t loc
, tree name
)
3138 struct c_label_vars
*label_vars
;
3142 label
= lookup_label (name
);
3143 if (label
== NULL_TREE
)
3146 /* If we are jumping to a different function, we can't issue any
3148 if (DECL_CONTEXT (label
) != current_function_decl
)
3150 gcc_assert (C_DECLARED_LABEL_FLAG (label
));
3154 label_vars
= I_LABEL_BINDING (name
)->u
.label
;
3156 /* If the label has not yet been defined, then push this goto on a
3157 list for possible later warnings. */
3158 if (label_vars
->label_bindings
.scope
== NULL
)
3160 struct c_goto_bindings
*g
;
3162 g
= ggc_alloc_c_goto_bindings ();
3164 set_spot_bindings (&g
->goto_bindings
, true);
3165 vec_safe_push (label_vars
->gotos
, g
);
3169 /* If there are any decls in label_vars->decls_in_scope, then this
3170 goto has missed the declaration of the decl. This happens for a
3176 Issue a warning or error. */
3177 FOR_EACH_VEC_SAFE_ELT (label_vars
->decls_in_scope
, ix
, decl
)
3178 warn_about_goto (loc
, label
, decl
);
3180 if (label_vars
->label_bindings
.left_stmt_expr
)
3182 error_at (loc
, "jump into statement expression");
3183 inform (DECL_SOURCE_LOCATION (label
), "label %qD defined here", label
);
3189 /* Make a label named NAME in the current function, shadowing silently
3190 any that may be inherited from containing functions or containing
3191 scopes. This is called for __label__ declarations. */
3194 declare_label (tree name
)
3196 struct c_binding
*b
= I_LABEL_BINDING (name
);
3198 struct c_label_vars
*label_vars
;
3200 /* Check to make sure that the label hasn't already been declared
3202 if (b
&& B_IN_CURRENT_SCOPE (b
))
3204 error ("duplicate label declaration %qE", name
);
3205 locate_old_decl (b
->decl
);
3207 /* Just use the previous declaration. */
3211 label
= make_label (input_location
, name
, false, &label_vars
);
3212 C_DECLARED_LABEL_FLAG (label
) = 1;
3214 /* Declared labels go in the current scope. */
3215 bind_label (name
, label
, current_scope
, label_vars
);
3220 /* When we define a label, issue any appropriate warnings if there are
3221 any gotos earlier in the function which jump to this label. */
3224 check_earlier_gotos (tree label
, struct c_label_vars
* label_vars
)
3227 struct c_goto_bindings
*g
;
3229 FOR_EACH_VEC_SAFE_ELT (label_vars
->gotos
, ix
, g
)
3231 struct c_binding
*b
;
3232 struct c_scope
*scope
;
3234 /* We have a goto to this label. The goto is going forward. In
3235 g->scope, the goto is going to skip any binding which was
3236 defined after g->bindings_in_scope. */
3237 if (g
->goto_bindings
.scope
->has_jump_unsafe_decl
)
3239 for (b
= g
->goto_bindings
.scope
->bindings
;
3240 b
!= g
->goto_bindings
.bindings_in_scope
;
3243 if (decl_jump_unsafe (b
->decl
))
3244 warn_about_goto (g
->loc
, label
, b
->decl
);
3248 /* We also need to warn about decls defined in any scopes
3249 between the scope of the label and the scope of the goto. */
3250 for (scope
= label_vars
->label_bindings
.scope
;
3251 scope
!= g
->goto_bindings
.scope
;
3252 scope
= scope
->outer
)
3254 gcc_assert (scope
!= NULL
);
3255 if (scope
->has_jump_unsafe_decl
)
3257 if (scope
== label_vars
->label_bindings
.scope
)
3258 b
= label_vars
->label_bindings
.bindings_in_scope
;
3260 b
= scope
->bindings
;
3261 for (; b
!= NULL
; b
= b
->prev
)
3263 if (decl_jump_unsafe (b
->decl
))
3264 warn_about_goto (g
->loc
, label
, b
->decl
);
3269 if (g
->goto_bindings
.stmt_exprs
> 0)
3271 error_at (g
->loc
, "jump into statement expression");
3272 inform (DECL_SOURCE_LOCATION (label
), "label %qD defined here",
3277 /* Now that the label is defined, we will issue warnings about
3278 subsequent gotos to this label when we see them. */
3279 vec_safe_truncate (label_vars
->gotos
, 0);
3280 label_vars
->gotos
= NULL
;
3283 /* Define a label, specifying the location in the source file.
3284 Return the LABEL_DECL node for the label, if the definition is valid.
3285 Otherwise return 0. */
3288 define_label (location_t location
, tree name
)
3290 /* Find any preexisting label with this name. It is an error
3291 if that label has already been defined in this function, or
3292 if there is a containing function with a declared label with
3294 tree label
= I_LABEL_DECL (name
);
3297 && ((DECL_CONTEXT (label
) == current_function_decl
3298 && DECL_INITIAL (label
) != 0)
3299 || (DECL_CONTEXT (label
) != current_function_decl
3300 && C_DECLARED_LABEL_FLAG (label
))))
3302 error_at (location
, "duplicate label %qD", label
);
3303 locate_old_decl (label
);
3306 else if (label
&& DECL_CONTEXT (label
) == current_function_decl
)
3308 struct c_label_vars
*label_vars
= I_LABEL_BINDING (name
)->u
.label
;
3310 /* The label has been used or declared already in this function,
3311 but not defined. Update its location to point to this
3313 DECL_SOURCE_LOCATION (label
) = location
;
3314 set_spot_bindings (&label_vars
->label_bindings
, true);
3316 /* Issue warnings as required about any goto statements from
3317 earlier in the function. */
3318 check_earlier_gotos (label
, label_vars
);
3322 struct c_label_vars
*label_vars
;
3324 /* No label binding for that identifier; make one. */
3325 label
= make_label (location
, name
, true, &label_vars
);
3327 /* Ordinary labels go in the current function scope. */
3328 bind_label (name
, label
, current_function_scope
, label_vars
);
3331 if (!in_system_header
&& lookup_name (name
))
3332 warning_at (location
, OPT_Wtraditional
,
3333 "traditional C lacks a separate namespace "
3334 "for labels, identifier %qE conflicts", name
);
3336 /* Mark label as having been defined. */
3337 DECL_INITIAL (label
) = error_mark_node
;
3341 /* Get the bindings for a new switch statement. This is used to issue
3342 warnings as appropriate for jumps from the switch to case or
3345 struct c_spot_bindings
*
3346 c_get_switch_bindings (void)
3348 struct c_spot_bindings
*switch_bindings
;
3350 switch_bindings
= XNEW (struct c_spot_bindings
);
3351 set_spot_bindings (switch_bindings
, true);
3352 return switch_bindings
;
3356 c_release_switch_bindings (struct c_spot_bindings
*bindings
)
3358 gcc_assert (bindings
->stmt_exprs
== 0 && !bindings
->left_stmt_expr
);
3362 /* This is called at the point of a case or default label to issue
3363 warnings about decls as needed. It returns true if it found an
3364 error, not just a warning. */
3367 c_check_switch_jump_warnings (struct c_spot_bindings
*switch_bindings
,
3368 location_t switch_loc
, location_t case_loc
)
3371 struct c_scope
*scope
;
3374 for (scope
= current_scope
;
3375 scope
!= switch_bindings
->scope
;
3376 scope
= scope
->outer
)
3378 struct c_binding
*b
;
3380 gcc_assert (scope
!= NULL
);
3382 if (!scope
->has_jump_unsafe_decl
)
3385 for (b
= scope
->bindings
; b
!= NULL
; b
= b
->prev
)
3387 if (decl_jump_unsafe (b
->decl
))
3389 if (variably_modified_type_p (TREE_TYPE (b
->decl
), NULL_TREE
))
3393 ("switch jumps into scope of identifier with "
3394 "variably modified type"));
3397 warning_at (case_loc
, OPT_Wjump_misses_init
,
3398 "switch jumps over variable initialization");
3399 inform (switch_loc
, "switch starts here");
3400 inform (DECL_SOURCE_LOCATION (b
->decl
), "%qD declared here",
3406 if (switch_bindings
->stmt_exprs
> 0)
3409 error_at (case_loc
, "switch jumps into statement expression");
3410 inform (switch_loc
, "switch starts here");
3416 /* Given NAME, an IDENTIFIER_NODE,
3417 return the structure (or union or enum) definition for that name.
3418 If THISLEVEL_ONLY is nonzero, searches only the current_scope.
3419 CODE says which kind of type the caller wants;
3420 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
3421 If PLOC is not NULL and this returns non-null, it sets *PLOC to the
3422 location where the tag was defined.
3423 If the wrong kind of type is found, an error is reported. */
3426 lookup_tag (enum tree_code code
, tree name
, int thislevel_only
,
3429 struct c_binding
*b
= I_TAG_BINDING (name
);
3435 /* We only care about whether it's in this level if
3436 thislevel_only was set or it might be a type clash. */
3437 if (thislevel_only
|| TREE_CODE (b
->decl
) != code
)
3439 /* For our purposes, a tag in the external scope is the same as
3440 a tag in the file scope. (Primarily relevant to Objective-C
3441 and its builtin structure tags, which get pushed before the
3442 file scope is created.) */
3443 if (B_IN_CURRENT_SCOPE (b
)
3444 || (current_scope
== file_scope
&& B_IN_EXTERNAL_SCOPE (b
)))
3448 if (thislevel_only
&& !thislevel
)
3451 if (TREE_CODE (b
->decl
) != code
)
3453 /* Definition isn't the kind we were looking for. */
3454 pending_invalid_xref
= name
;
3455 pending_invalid_xref_location
= input_location
;
3457 /* If in the same binding level as a declaration as a tag
3458 of a different type, this must not be allowed to
3459 shadow that tag, so give the error immediately.
3460 (For example, "struct foo; union foo;" is invalid.) */
3462 pending_xref_error ();
3471 /* Print an error message now
3472 for a recent invalid struct, union or enum cross reference.
3473 We don't print them immediately because they are not invalid
3474 when used in the `struct foo;' construct for shadowing. */
3477 pending_xref_error (void)
3479 if (pending_invalid_xref
!= 0)
3480 error_at (pending_invalid_xref_location
, "%qE defined as wrong kind of tag",
3481 pending_invalid_xref
);
3482 pending_invalid_xref
= 0;
3486 /* Look up NAME in the current scope and its superiors
3487 in the namespace of variables, functions and typedefs.
3488 Return a ..._DECL node of some kind representing its definition,
3489 or return 0 if it is undefined. */
3492 lookup_name (tree name
)
3494 struct c_binding
*b
= I_SYMBOL_BINDING (name
);
3495 if (b
&& !b
->invisible
)
3497 maybe_record_typedef_use (b
->decl
);
3503 /* Similar to `lookup_name' but look only at the indicated scope. */
3506 lookup_name_in_scope (tree name
, struct c_scope
*scope
)
3508 struct c_binding
*b
;
3510 for (b
= I_SYMBOL_BINDING (name
); b
; b
= b
->shadowed
)
3511 if (B_IN_SCOPE (b
, scope
))
3516 /* Create the predefined scalar types of C,
3517 and some nodes representing standard constants (0, 1, (void *) 0).
3518 Initialize the global scope.
3519 Make definitions for built-in primitive functions. */
3522 c_init_decl_processing (void)
3524 location_t save_loc
= input_location
;
3526 /* Initialize reserved words for parser. */
3529 current_function_decl
= 0;
3531 gcc_obstack_init (&parser_obstack
);
3533 /* Make the externals scope. */
3535 external_scope
= current_scope
;
3537 /* Declarations from c_common_nodes_and_builtins must not be associated
3538 with this input file, lest we get differences between using and not
3539 using preprocessed headers. */
3540 input_location
= BUILTINS_LOCATION
;
3542 c_common_nodes_and_builtins ();
3544 /* In C, comparisons and TRUTH_* expressions have type int. */
3545 truthvalue_type_node
= integer_type_node
;
3546 truthvalue_true_node
= integer_one_node
;
3547 truthvalue_false_node
= integer_zero_node
;
3549 /* Even in C99, which has a real boolean type. */
3550 pushdecl (build_decl (UNKNOWN_LOCATION
, TYPE_DECL
, get_identifier ("_Bool"),
3551 boolean_type_node
));
3553 input_location
= save_loc
;
3555 pedantic_lvalues
= true;
3557 make_fname_decl
= c_make_fname_decl
;
3558 start_fname_decls ();
3561 /* Create the VAR_DECL at LOC for __FUNCTION__ etc. ID is the name to
3562 give the decl, NAME is the initialization string and TYPE_DEP
3563 indicates whether NAME depended on the type of the function. As we
3564 don't yet implement delayed emission of static data, we mark the
3565 decl as emitted so it is not placed in the output. Anything using
3566 it must therefore pull out the STRING_CST initializer directly.
3570 c_make_fname_decl (location_t loc
, tree id
, int type_dep
)
3572 const char *name
= fname_as_string (type_dep
);
3573 tree decl
, type
, init
;
3574 size_t length
= strlen (name
);
3576 type
= build_array_type (char_type_node
,
3577 build_index_type (size_int (length
)));
3578 type
= c_build_qualified_type (type
, TYPE_QUAL_CONST
);
3580 decl
= build_decl (loc
, VAR_DECL
, id
, type
);
3582 TREE_STATIC (decl
) = 1;
3583 TREE_READONLY (decl
) = 1;
3584 DECL_ARTIFICIAL (decl
) = 1;
3586 init
= build_string (length
+ 1, name
);
3587 free (CONST_CAST (char *, name
));
3588 TREE_TYPE (init
) = type
;
3589 DECL_INITIAL (decl
) = init
;
3591 TREE_USED (decl
) = 1;
3593 if (current_function_decl
3594 /* For invalid programs like this:
3597 const char* p = __FUNCTION__;
3599 the __FUNCTION__ is believed to appear in K&R style function
3600 parameter declarator. In that case we still don't have
3602 && (!seen_error () || current_function_scope
))
3604 DECL_CONTEXT (decl
) = current_function_decl
;
3605 bind (id
, decl
, current_function_scope
,
3606 /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION
);
3609 finish_decl (decl
, loc
, init
, NULL_TREE
, NULL_TREE
);
3615 c_builtin_function (tree decl
)
3617 tree type
= TREE_TYPE (decl
);
3618 tree id
= DECL_NAME (decl
);
3620 const char *name
= IDENTIFIER_POINTER (id
);
3621 C_DECL_BUILTIN_PROTOTYPE (decl
) = prototype_p (type
);
3623 /* Should never be called on a symbol with a preexisting meaning. */
3624 gcc_assert (!I_SYMBOL_BINDING (id
));
3626 bind (id
, decl
, external_scope
, /*invisible=*/true, /*nested=*/false,
3629 /* Builtins in the implementation namespace are made visible without
3630 needing to be explicitly declared. See push_file_scope. */
3631 if (name
[0] == '_' && (name
[1] == '_' || ISUPPER (name
[1])))
3633 DECL_CHAIN (decl
) = visible_builtins
;
3634 visible_builtins
= decl
;
3641 c_builtin_function_ext_scope (tree decl
)
3643 tree type
= TREE_TYPE (decl
);
3644 tree id
= DECL_NAME (decl
);
3646 const char *name
= IDENTIFIER_POINTER (id
);
3647 C_DECL_BUILTIN_PROTOTYPE (decl
) = prototype_p (type
);
3649 bind (id
, decl
, external_scope
, /*invisible=*/false, /*nested=*/false,
3652 /* Builtins in the implementation namespace are made visible without
3653 needing to be explicitly declared. See push_file_scope. */
3654 if (name
[0] == '_' && (name
[1] == '_' || ISUPPER (name
[1])))
3656 DECL_CHAIN (decl
) = visible_builtins
;
3657 visible_builtins
= decl
;
3663 /* Called when a declaration is seen that contains no names to declare.
3664 If its type is a reference to a structure, union or enum inherited
3665 from a containing scope, shadow that tag name for the current scope
3666 with a forward reference.
3667 If its type defines a new named structure or union
3668 or defines an enum, it is valid but we need not do anything here.
3669 Otherwise, it is an error. */
3672 shadow_tag (const struct c_declspecs
*declspecs
)
3674 shadow_tag_warned (declspecs
, 0);
3677 /* WARNED is 1 if we have done a pedwarn, 2 if we have done a warning,
3680 shadow_tag_warned (const struct c_declspecs
*declspecs
, int warned
)
3682 bool found_tag
= false;
3684 if (declspecs
->type
&& !declspecs
->default_int_p
&& !declspecs
->typedef_p
)
3686 tree value
= declspecs
->type
;
3687 enum tree_code code
= TREE_CODE (value
);
3689 if (code
== RECORD_TYPE
|| code
== UNION_TYPE
|| code
== ENUMERAL_TYPE
)
3690 /* Used to test also that TYPE_SIZE (value) != 0.
3691 That caused warning for `struct foo;' at top level in the file. */
3693 tree name
= TYPE_NAME (value
);
3698 if (declspecs
->restrict_p
)
3700 error ("invalid use of %<restrict%>");
3706 if (warned
!= 1 && code
!= ENUMERAL_TYPE
)
3707 /* Empty unnamed enum OK */
3709 pedwarn (input_location
, 0,
3710 "unnamed struct/union that defines no instances");
3714 else if (declspecs
->typespec_kind
!= ctsk_tagdef
3715 && declspecs
->typespec_kind
!= ctsk_tagfirstref
3716 && declspecs
->storage_class
!= csc_none
)
3719 pedwarn (input_location
, 0,
3720 "empty declaration with storage class specifier "
3721 "does not redeclare tag");
3723 pending_xref_error ();
3725 else if (declspecs
->typespec_kind
!= ctsk_tagdef
3726 && declspecs
->typespec_kind
!= ctsk_tagfirstref
3727 && (declspecs
->const_p
3728 || declspecs
->volatile_p
3729 || declspecs
->atomic_p
3730 || declspecs
->restrict_p
3731 || declspecs
->address_space
))
3734 pedwarn (input_location
, 0,
3735 "empty declaration with type qualifier "
3736 "does not redeclare tag");
3738 pending_xref_error ();
3740 else if (declspecs
->typespec_kind
!= ctsk_tagdef
3741 && declspecs
->typespec_kind
!= ctsk_tagfirstref
3742 && declspecs
->alignas_p
)
3745 pedwarn (input_location
, 0,
3746 "empty declaration with %<_Alignas%> "
3747 "does not redeclare tag");
3749 pending_xref_error ();
3753 pending_invalid_xref
= 0;
3754 t
= lookup_tag (code
, name
, 1, NULL
);
3758 t
= make_node (code
);
3759 pushtag (input_location
, name
, t
);
3765 if (warned
!= 1 && !in_system_header
)
3767 pedwarn (input_location
, 0,
3768 "useless type name in empty declaration");
3773 else if (warned
!= 1 && !in_system_header
&& declspecs
->typedef_p
)
3775 pedwarn (input_location
, 0, "useless type name in empty declaration");
3779 pending_invalid_xref
= 0;
3781 if (declspecs
->inline_p
)
3783 error ("%<inline%> in empty declaration");
3787 if (declspecs
->noreturn_p
)
3789 error ("%<_Noreturn%> in empty declaration");
3793 if (current_scope
== file_scope
&& declspecs
->storage_class
== csc_auto
)
3795 error ("%<auto%> in file-scope empty declaration");
3799 if (current_scope
== file_scope
&& declspecs
->storage_class
== csc_register
)
3801 error ("%<register%> in file-scope empty declaration");
3805 if (!warned
&& !in_system_header
&& declspecs
->storage_class
!= csc_none
)
3807 warning (0, "useless storage class specifier in empty declaration");
3811 if (!warned
&& !in_system_header
&& declspecs
->thread_p
)
3813 warning (0, "useless %qs in empty declaration",
3814 declspecs
->thread_gnu_p
? "__thread" : "_Thread_local");
3818 if (!warned
&& !in_system_header
&& (declspecs
->const_p
3819 || declspecs
->volatile_p
3820 || declspecs
->atomic_p
3821 || declspecs
->restrict_p
3822 || declspecs
->address_space
))
3824 warning (0, "useless type qualifier in empty declaration");
3828 if (!warned
&& !in_system_header
&& declspecs
->alignas_p
)
3830 warning (0, "useless %<_Alignas%> in empty declaration");
3837 pedwarn (input_location
, 0, "empty declaration");
3842 /* Return the qualifiers from SPECS as a bitwise OR of TYPE_QUAL_*
3843 bits. SPECS represents declaration specifiers that the grammar
3844 only permits to contain type qualifiers and attributes. */
3847 quals_from_declspecs (const struct c_declspecs
*specs
)
3849 int quals
= ((specs
->const_p
? TYPE_QUAL_CONST
: 0)
3850 | (specs
->volatile_p
? TYPE_QUAL_VOLATILE
: 0)
3851 | (specs
->restrict_p
? TYPE_QUAL_RESTRICT
: 0)
3852 | (specs
->atomic_p
? TYPE_QUAL_ATOMIC
: 0)
3853 | (ENCODE_QUAL_ADDR_SPACE (specs
->address_space
)));
3854 gcc_assert (!specs
->type
3855 && !specs
->decl_attr
3856 && specs
->typespec_word
== cts_none
3857 && specs
->storage_class
== csc_none
3858 && !specs
->typedef_p
3859 && !specs
->explicit_signed_p
3860 && !specs
->deprecated_p
3862 && !specs
->long_long_p
3865 && !specs
->unsigned_p
3866 && !specs
->complex_p
3868 && !specs
->noreturn_p
3869 && !specs
->thread_p
);
3873 /* Construct an array declarator. LOC is the location of the
3874 beginning of the array (usually the opening brace). EXPR is the
3875 expression inside [], or NULL_TREE. QUALS are the type qualifiers
3876 inside the [] (to be applied to the pointer to which a parameter
3877 array is converted). STATIC_P is true if "static" is inside the
3878 [], false otherwise. VLA_UNSPEC_P is true if the array is [*], a
3879 VLA of unspecified length which is nevertheless a complete type,
3880 false otherwise. The field for the contained declarator is left to
3881 be filled in by set_array_declarator_inner. */
3883 struct c_declarator
*
3884 build_array_declarator (location_t loc
,
3885 tree expr
, struct c_declspecs
*quals
, bool static_p
,
3888 struct c_declarator
*declarator
= XOBNEW (&parser_obstack
,
3889 struct c_declarator
);
3890 declarator
->id_loc
= loc
;
3891 declarator
->kind
= cdk_array
;
3892 declarator
->declarator
= 0;
3893 declarator
->u
.array
.dimen
= expr
;
3896 declarator
->u
.array
.attrs
= quals
->attrs
;
3897 declarator
->u
.array
.quals
= quals_from_declspecs (quals
);
3901 declarator
->u
.array
.attrs
= NULL_TREE
;
3902 declarator
->u
.array
.quals
= 0;
3904 declarator
->u
.array
.static_p
= static_p
;
3905 declarator
->u
.array
.vla_unspec_p
= vla_unspec_p
;
3908 if (static_p
|| quals
!= NULL
)
3909 pedwarn (loc
, OPT_Wpedantic
,
3910 "ISO C90 does not support %<static%> or type "
3911 "qualifiers in parameter array declarators");
3913 pedwarn (loc
, OPT_Wpedantic
,
3914 "ISO C90 does not support %<[*]%> array declarators");
3918 if (!current_scope
->parm_flag
)
3921 error_at (loc
, "%<[*]%> not allowed in other than "
3922 "function prototype scope");
3923 declarator
->u
.array
.vla_unspec_p
= false;
3926 current_scope
->had_vla_unspec
= true;
3931 /* Set the contained declarator of an array declarator. DECL is the
3932 declarator, as constructed by build_array_declarator; INNER is what
3933 appears on the left of the []. */
3935 struct c_declarator
*
3936 set_array_declarator_inner (struct c_declarator
*decl
,
3937 struct c_declarator
*inner
)
3939 decl
->declarator
= inner
;
3943 /* INIT is a constructor that forms DECL's initializer. If the final
3944 element initializes a flexible array field, add the size of that
3945 initializer to DECL's size. */
3948 add_flexible_array_elts_to_size (tree decl
, tree init
)
3952 if (vec_safe_is_empty (CONSTRUCTOR_ELTS (init
)))
3955 elt
= CONSTRUCTOR_ELTS (init
)->last ().value
;
3956 type
= TREE_TYPE (elt
);
3957 if (TREE_CODE (type
) == ARRAY_TYPE
3958 && TYPE_SIZE (type
) == NULL_TREE
3959 && TYPE_DOMAIN (type
) != NULL_TREE
3960 && TYPE_MAX_VALUE (TYPE_DOMAIN (type
)) == NULL_TREE
)
3962 complete_array_type (&type
, elt
, false);
3964 = size_binop (PLUS_EXPR
, DECL_SIZE (decl
), TYPE_SIZE (type
));
3965 DECL_SIZE_UNIT (decl
)
3966 = size_binop (PLUS_EXPR
, DECL_SIZE_UNIT (decl
), TYPE_SIZE_UNIT (type
));
3970 /* Decode a "typename", such as "int **", returning a ..._TYPE node.
3971 Set *EXPR, if EXPR not NULL, to any expression to be evaluated
3972 before the type name, and set *EXPR_CONST_OPERANDS, if
3973 EXPR_CONST_OPERANDS not NULL, to indicate whether the type name may
3974 appear in a constant expression. */
3977 groktypename (struct c_type_name
*type_name
, tree
*expr
,
3978 bool *expr_const_operands
)
3981 tree attrs
= type_name
->specs
->attrs
;
3983 type_name
->specs
->attrs
= NULL_TREE
;
3985 type
= grokdeclarator (type_name
->declarator
, type_name
->specs
, TYPENAME
,
3986 false, NULL
, &attrs
, expr
, expr_const_operands
,
3989 /* Apply attributes. */
3990 decl_attributes (&type
, attrs
, 0);
3995 /* Wrapper for decl_attributes that adds some implicit attributes
3996 to VAR_DECLs or FUNCTION_DECLs. */
3999 c_decl_attributes (tree
*node
, tree attributes
, int flags
)
4001 /* Add implicit "omp declare target" attribute if requested. */
4002 if (current_omp_declare_target_attribute
4003 && ((TREE_CODE (*node
) == VAR_DECL
&& TREE_STATIC (*node
))
4004 || TREE_CODE (*node
) == FUNCTION_DECL
))
4006 if (TREE_CODE (*node
) == VAR_DECL
4007 && ((DECL_CONTEXT (*node
)
4008 && TREE_CODE (DECL_CONTEXT (*node
)) == FUNCTION_DECL
)
4009 || (current_function_decl
&& !DECL_EXTERNAL (*node
))))
4010 error ("%q+D in block scope inside of declare target directive",
4012 else if (TREE_CODE (*node
) == VAR_DECL
4013 && !COMPLETE_TYPE_P (TREE_TYPE (*node
)))
4014 error ("%q+D in declare target directive does not have mappable type",
4017 attributes
= tree_cons (get_identifier ("omp declare target"),
4018 NULL_TREE
, attributes
);
4020 return decl_attributes (node
, attributes
, flags
);
4024 /* Decode a declarator in an ordinary declaration or data definition.
4025 This is called as soon as the type information and variable name
4026 have been parsed, before parsing the initializer if any.
4027 Here we create the ..._DECL node, fill in its type,
4028 and put it on the list of decls for the current context.
4029 The ..._DECL node is returned as the value.
4031 Exception: for arrays where the length is not specified,
4032 the type is left null, to be filled in by `finish_decl'.
4034 Function definitions do not come here; they go to start_function
4035 instead. However, external and forward declarations of functions
4036 do go through here. Structure field declarations are done by
4037 grokfield and not through here. */
4040 start_decl (struct c_declarator
*declarator
, struct c_declspecs
*declspecs
,
4041 bool initialized
, tree attributes
)
4045 tree expr
= NULL_TREE
;
4046 enum deprecated_states deprecated_state
= DEPRECATED_NORMAL
;
4048 /* An object declared as __attribute__((deprecated)) suppresses
4049 warnings of uses of other deprecated items. */
4050 if (lookup_attribute ("deprecated", attributes
))
4051 deprecated_state
= DEPRECATED_SUPPRESS
;
4053 decl
= grokdeclarator (declarator
, declspecs
,
4054 NORMAL
, initialized
, NULL
, &attributes
, &expr
, NULL
,
4060 add_stmt (fold_convert (void_type_node
, expr
));
4062 if (TREE_CODE (decl
) != FUNCTION_DECL
&& MAIN_NAME_P (DECL_NAME (decl
)))
4063 warning (OPT_Wmain
, "%q+D is usually a function", decl
);
4066 /* Is it valid for this decl to have an initializer at all?
4067 If not, set INITIALIZED to zero, which will indirectly
4068 tell 'finish_decl' to ignore the initializer once it is parsed. */
4069 switch (TREE_CODE (decl
))
4072 error ("typedef %qD is initialized (use __typeof__ instead)", decl
);
4077 error ("function %qD is initialized like a variable", decl
);
4082 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
4083 error ("parameter %qD is initialized", decl
);
4088 /* Don't allow initializations for incomplete types except for
4089 arrays which might be completed by the initialization. */
4091 /* This can happen if the array size is an undefined macro.
4092 We already gave a warning, so we don't need another one. */
4093 if (TREE_TYPE (decl
) == error_mark_node
)
4095 else if (COMPLETE_TYPE_P (TREE_TYPE (decl
)))
4097 /* A complete type is ok if size is fixed. */
4099 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl
))) != INTEGER_CST
4100 || C_DECL_VARIABLE_SIZE (decl
))
4102 error ("variable-sized object may not be initialized");
4106 else if (TREE_CODE (TREE_TYPE (decl
)) != ARRAY_TYPE
)
4108 error ("variable %qD has initializer but incomplete type", decl
);
4111 else if (C_DECL_VARIABLE_SIZE (decl
))
4113 /* Although C99 is unclear about whether incomplete arrays
4114 of VLAs themselves count as VLAs, it does not make
4115 sense to permit them to be initialized given that
4116 ordinary VLAs may not be initialized. */
4117 error ("variable-sized object may not be initialized");
4124 if (current_scope
== file_scope
)
4125 TREE_STATIC (decl
) = 1;
4127 /* Tell 'pushdecl' this is an initialized decl
4128 even though we don't yet have the initializer expression.
4129 Also tell 'finish_decl' it may store the real initializer. */
4130 DECL_INITIAL (decl
) = error_mark_node
;
4133 /* If this is a function declaration, write a record describing it to the
4134 prototypes file (if requested). */
4136 if (TREE_CODE (decl
) == FUNCTION_DECL
)
4137 gen_aux_info_record (decl
, 0, 0, prototype_p (TREE_TYPE (decl
)));
4139 /* ANSI specifies that a tentative definition which is not merged with
4140 a non-tentative definition behaves exactly like a definition with an
4141 initializer equal to zero. (Section 3.7.2)
4143 -fno-common gives strict ANSI behavior, though this tends to break
4144 a large body of code that grew up without this rule.
4146 Thread-local variables are never common, since there's no entrenched
4147 body of code to break, and it allows more efficient variable references
4148 in the presence of dynamic linking. */
4150 if (TREE_CODE (decl
) == VAR_DECL
4152 && TREE_PUBLIC (decl
)
4153 && !DECL_THREAD_LOCAL_P (decl
)
4155 DECL_COMMON (decl
) = 1;
4157 /* Set attributes here so if duplicate decl, will have proper attributes. */
4158 c_decl_attributes (&decl
, attributes
, 0);
4160 /* Handle gnu_inline attribute. */
4161 if (declspecs
->inline_p
4162 && !flag_gnu89_inline
4163 && TREE_CODE (decl
) == FUNCTION_DECL
4164 && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl
))
4165 || current_function_decl
))
4167 if (declspecs
->storage_class
== csc_auto
&& current_scope
!= file_scope
)
4169 else if (declspecs
->storage_class
!= csc_static
)
4170 DECL_EXTERNAL (decl
) = !DECL_EXTERNAL (decl
);
4173 if (TREE_CODE (decl
) == FUNCTION_DECL
4174 && targetm
.calls
.promote_prototypes (TREE_TYPE (decl
)))
4176 struct c_declarator
*ce
= declarator
;
4178 if (ce
->kind
== cdk_pointer
)
4179 ce
= declarator
->declarator
;
4180 if (ce
->kind
== cdk_function
)
4182 tree args
= ce
->u
.arg_info
->parms
;
4183 for (; args
; args
= DECL_CHAIN (args
))
4185 tree type
= TREE_TYPE (args
);
4186 if (type
&& INTEGRAL_TYPE_P (type
)
4187 && TYPE_PRECISION (type
) < TYPE_PRECISION (integer_type_node
))
4188 DECL_ARG_TYPE (args
) = c_type_promotes_to (type
);
4193 if (TREE_CODE (decl
) == FUNCTION_DECL
4194 && DECL_DECLARED_INLINE_P (decl
)
4195 && DECL_UNINLINABLE (decl
)
4196 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl
)))
4197 warning (OPT_Wattributes
, "inline function %q+D given attribute noinline",
4200 /* C99 6.7.4p3: An inline definition of a function with external
4201 linkage shall not contain a definition of a modifiable object
4202 with static storage duration... */
4203 if (TREE_CODE (decl
) == VAR_DECL
4204 && current_scope
!= file_scope
4205 && TREE_STATIC (decl
)
4206 && !TREE_READONLY (decl
)
4207 && DECL_DECLARED_INLINE_P (current_function_decl
)
4208 && DECL_EXTERNAL (current_function_decl
))
4209 record_inline_static (input_location
, current_function_decl
,
4210 decl
, csi_modifiable
);
4212 if (c_dialect_objc ()
4213 && (TREE_CODE (decl
) == VAR_DECL
4214 || TREE_CODE (decl
) == FUNCTION_DECL
))
4215 objc_check_global_decl (decl
);
4217 /* Add this decl to the current scope.
4218 TEM may equal DECL or it may be a previous decl of the same name. */
4219 tem
= pushdecl (decl
);
4221 if (initialized
&& DECL_EXTERNAL (tem
))
4223 DECL_EXTERNAL (tem
) = 0;
4224 TREE_STATIC (tem
) = 1;
4230 /* Subroutine of finish_decl. TYPE is the type of an uninitialized object
4231 DECL or the non-array element type if DECL is an uninitialized array.
4232 If that type has a const member, diagnose this. */
4235 diagnose_uninitialized_cst_member (tree decl
, tree type
)
4238 for (field
= TYPE_FIELDS (type
); field
; field
= TREE_CHAIN (field
))
4241 if (TREE_CODE (field
) != FIELD_DECL
)
4243 field_type
= strip_array_types (TREE_TYPE (field
));
4245 if (TYPE_QUALS (field_type
) & TYPE_QUAL_CONST
)
4247 warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wc___compat
,
4248 "uninitialized const member in %qT is invalid in C++",
4249 strip_array_types (TREE_TYPE (decl
)));
4250 inform (DECL_SOURCE_LOCATION (field
), "%qD should be initialized", field
);
4253 if (TREE_CODE (field_type
) == RECORD_TYPE
4254 || TREE_CODE (field_type
) == UNION_TYPE
)
4255 diagnose_uninitialized_cst_member (decl
, field_type
);
4259 /* Finish processing of a declaration;
4260 install its initial value.
4261 If ORIGTYPE is not NULL_TREE, it is the original type of INIT.
4262 If the length of an array type is not known before,
4263 it must be determined now, from the initial value, or it is an error.
4265 INIT_LOC is the location of the initial value. */
4268 finish_decl (tree decl
, location_t init_loc
, tree init
,
4269 tree origtype
, tree asmspec_tree
)
4272 bool was_incomplete
= (DECL_SIZE (decl
) == 0);
4273 const char *asmspec
= 0;
4275 /* If a name was specified, get the string. */
4276 if ((TREE_CODE (decl
) == FUNCTION_DECL
|| TREE_CODE (decl
) == VAR_DECL
)
4277 && DECL_FILE_SCOPE_P (decl
))
4278 asmspec_tree
= maybe_apply_renaming_pragma (decl
, asmspec_tree
);
4280 asmspec
= TREE_STRING_POINTER (asmspec_tree
);
4282 if (TREE_CODE (decl
) == VAR_DECL
4283 && TREE_STATIC (decl
)
4284 && global_bindings_p ())
4285 /* So decl is a global variable. Record the types it uses
4286 so that we can decide later to emit debug info for them. */
4287 record_types_used_by_current_var_decl (decl
);
4289 /* If `start_decl' didn't like having an initialization, ignore it now. */
4290 if (init
!= 0 && DECL_INITIAL (decl
) == 0)
4293 /* Don't crash if parm is initialized. */
4294 if (TREE_CODE (decl
) == PARM_DECL
)
4298 store_init_value (init_loc
, decl
, init
, origtype
);
4300 if (c_dialect_objc () && (TREE_CODE (decl
) == VAR_DECL
4301 || TREE_CODE (decl
) == FUNCTION_DECL
4302 || TREE_CODE (decl
) == FIELD_DECL
))
4303 objc_check_decl (decl
);
4305 type
= TREE_TYPE (decl
);
4307 /* Deduce size of array from initialization, if not already known. */
4308 if (TREE_CODE (type
) == ARRAY_TYPE
4309 && TYPE_DOMAIN (type
) == 0
4310 && TREE_CODE (decl
) != TYPE_DECL
)
4313 = (TREE_STATIC (decl
)
4314 /* Even if pedantic, an external linkage array
4315 may have incomplete type at first. */
4316 ? pedantic
&& !TREE_PUBLIC (decl
)
4317 : !DECL_EXTERNAL (decl
));
4319 = complete_array_type (&TREE_TYPE (decl
), DECL_INITIAL (decl
),
4322 /* Get the completed type made by complete_array_type. */
4323 type
= TREE_TYPE (decl
);
4328 error ("initializer fails to determine size of %q+D", decl
);
4333 error ("array size missing in %q+D", decl
);
4334 /* If a `static' var's size isn't known,
4335 make it extern as well as static, so it does not get
4337 If it is not `static', then do not mark extern;
4338 finish_incomplete_decl will give it a default size
4339 and it will get allocated. */
4340 else if (!pedantic
&& TREE_STATIC (decl
) && !TREE_PUBLIC (decl
))
4341 DECL_EXTERNAL (decl
) = 1;
4345 error ("zero or negative size array %q+D", decl
);
4349 /* For global variables, update the copy of the type that
4350 exists in the binding. */
4351 if (TREE_PUBLIC (decl
))
4353 struct c_binding
*b_ext
= I_SYMBOL_BINDING (DECL_NAME (decl
));
4354 while (b_ext
&& !B_IN_EXTERNAL_SCOPE (b_ext
))
4355 b_ext
= b_ext
->shadowed
;
4358 if (b_ext
->u
.type
&& comptypes (b_ext
->u
.type
, type
))
4359 b_ext
->u
.type
= composite_type (b_ext
->u
.type
, type
);
4361 b_ext
->u
.type
= type
;
4370 if (DECL_INITIAL (decl
))
4371 TREE_TYPE (DECL_INITIAL (decl
)) = type
;
4373 relayout_decl (decl
);
4376 if (TREE_CODE (decl
) == VAR_DECL
)
4378 if (init
&& TREE_CODE (init
) == CONSTRUCTOR
)
4379 add_flexible_array_elts_to_size (decl
, init
);
4381 if (DECL_SIZE (decl
) == 0 && TREE_TYPE (decl
) != error_mark_node
4382 && COMPLETE_TYPE_P (TREE_TYPE (decl
)))
4383 layout_decl (decl
, 0);
4385 if (DECL_SIZE (decl
) == 0
4386 /* Don't give an error if we already gave one earlier. */
4387 && TREE_TYPE (decl
) != error_mark_node
4388 && (TREE_STATIC (decl
)
4389 /* A static variable with an incomplete type
4390 is an error if it is initialized.
4391 Also if it is not file scope.
4392 Otherwise, let it through, but if it is not `extern'
4393 then it may cause an error message later. */
4394 ? (DECL_INITIAL (decl
) != 0
4395 || !DECL_FILE_SCOPE_P (decl
))
4396 /* An automatic variable with an incomplete type
4398 : !DECL_EXTERNAL (decl
)))
4400 error ("storage size of %q+D isn%'t known", decl
);
4401 TREE_TYPE (decl
) = error_mark_node
;
4404 if ((DECL_EXTERNAL (decl
) || TREE_STATIC (decl
))
4405 && DECL_SIZE (decl
) != 0)
4407 if (TREE_CODE (DECL_SIZE (decl
)) == INTEGER_CST
)
4408 constant_expression_warning (DECL_SIZE (decl
));
4411 error ("storage size of %q+D isn%'t constant", decl
);
4412 TREE_TYPE (decl
) = error_mark_node
;
4416 if (TREE_USED (type
))
4418 TREE_USED (decl
) = 1;
4419 DECL_READ_P (decl
) = 1;
4423 /* If this is a function and an assembler name is specified, reset DECL_RTL
4424 so we can give it its new name. Also, update builtin_decl if it
4425 was a normal built-in. */
4426 if (TREE_CODE (decl
) == FUNCTION_DECL
&& asmspec
)
4428 if (DECL_BUILT_IN_CLASS (decl
) == BUILT_IN_NORMAL
)
4429 set_builtin_user_assembler_name (decl
, asmspec
);
4430 set_user_assembler_name (decl
, asmspec
);
4433 /* If #pragma weak was used, mark the decl weak now. */
4434 maybe_apply_pragma_weak (decl
);
4436 /* Output the assembler code and/or RTL code for variables and functions,
4437 unless the type is an undefined structure or union.
4438 If not, it will get done when the type is completed. */
4440 if (TREE_CODE (decl
) == VAR_DECL
|| TREE_CODE (decl
) == FUNCTION_DECL
)
4442 /* Determine the ELF visibility. */
4443 if (TREE_PUBLIC (decl
))
4444 c_determine_visibility (decl
);
4446 /* This is a no-op in c-lang.c or something real in objc-act.c. */
4447 if (c_dialect_objc ())
4448 objc_check_decl (decl
);
4452 /* If this is not a static variable, issue a warning.
4453 It doesn't make any sense to give an ASMSPEC for an
4454 ordinary, non-register local variable. Historically,
4455 GCC has accepted -- but ignored -- the ASMSPEC in
4457 if (!DECL_FILE_SCOPE_P (decl
)
4458 && TREE_CODE (decl
) == VAR_DECL
4459 && !C_DECL_REGISTER (decl
)
4460 && !TREE_STATIC (decl
))
4461 warning (0, "ignoring asm-specifier for non-static local "
4462 "variable %q+D", decl
);
4464 set_user_assembler_name (decl
, asmspec
);
4467 if (DECL_FILE_SCOPE_P (decl
))
4469 if (DECL_INITIAL (decl
) == NULL_TREE
4470 || DECL_INITIAL (decl
) == error_mark_node
)
4471 /* Don't output anything
4472 when a tentative file-scope definition is seen.
4473 But at end of compilation, do output code for them. */
4474 DECL_DEFER_OUTPUT (decl
) = 1;
4475 if (asmspec
&& C_DECL_REGISTER (decl
))
4476 DECL_HARD_REGISTER (decl
) = 1;
4477 rest_of_decl_compilation (decl
, true, 0);
4481 /* In conjunction with an ASMSPEC, the `register'
4482 keyword indicates that we should place the variable
4483 in a particular register. */
4484 if (asmspec
&& C_DECL_REGISTER (decl
))
4486 DECL_HARD_REGISTER (decl
) = 1;
4487 /* This cannot be done for a structure with volatile
4488 fields, on which DECL_REGISTER will have been
4490 if (!DECL_REGISTER (decl
))
4491 error ("cannot put object with volatile field into register");
4494 if (TREE_CODE (decl
) != FUNCTION_DECL
)
4496 /* If we're building a variable sized type, and we might be
4497 reachable other than via the top of the current binding
4498 level, then create a new BIND_EXPR so that we deallocate
4499 the object at the right time. */
4500 /* Note that DECL_SIZE can be null due to errors. */
4501 if (DECL_SIZE (decl
)
4502 && !TREE_CONSTANT (DECL_SIZE (decl
))
4503 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list
))
4506 bind
= build3 (BIND_EXPR
, void_type_node
, NULL
, NULL
, NULL
);
4507 TREE_SIDE_EFFECTS (bind
) = 1;
4509 BIND_EXPR_BODY (bind
) = push_stmt_list ();
4511 add_stmt (build_stmt (DECL_SOURCE_LOCATION (decl
),
4517 if (!DECL_FILE_SCOPE_P (decl
))
4519 /* Recompute the RTL of a local array now
4520 if it used to be an incomplete type. */
4522 && !TREE_STATIC (decl
) && !DECL_EXTERNAL (decl
))
4524 /* If we used it already as memory, it must stay in memory. */
4525 TREE_ADDRESSABLE (decl
) = TREE_USED (decl
);
4526 /* If it's still incomplete now, no init will save it. */
4527 if (DECL_SIZE (decl
) == 0)
4528 DECL_INITIAL (decl
) = 0;
4533 if (TREE_CODE (decl
) == TYPE_DECL
)
4535 if (!DECL_FILE_SCOPE_P (decl
)
4536 && variably_modified_type_p (TREE_TYPE (decl
), NULL_TREE
))
4537 add_stmt (build_stmt (DECL_SOURCE_LOCATION (decl
), DECL_EXPR
, decl
));
4539 rest_of_decl_compilation (decl
, DECL_FILE_SCOPE_P (decl
), 0);
4542 /* Install a cleanup (aka destructor) if one was given. */
4543 if (TREE_CODE (decl
) == VAR_DECL
&& !TREE_STATIC (decl
))
4545 tree attr
= lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl
));
4548 tree cleanup_id
= TREE_VALUE (TREE_VALUE (attr
));
4549 tree cleanup_decl
= lookup_name (cleanup_id
);
4551 vec
<tree
, va_gc
> *v
;
4553 /* Build "cleanup(&decl)" for the destructor. */
4554 cleanup
= build_unary_op (input_location
, ADDR_EXPR
, decl
, 0);
4556 v
->quick_push (cleanup
);
4557 cleanup
= build_function_call_vec (DECL_SOURCE_LOCATION (decl
),
4558 cleanup_decl
, v
, NULL
);
4561 /* Don't warn about decl unused; the cleanup uses it. */
4562 TREE_USED (decl
) = 1;
4563 TREE_USED (cleanup_decl
) = 1;
4564 DECL_READ_P (decl
) = 1;
4566 push_cleanup (decl
, cleanup
, false);
4571 && TREE_CODE (decl
) == VAR_DECL
4572 && !DECL_EXTERNAL (decl
)
4573 && DECL_INITIAL (decl
) == NULL_TREE
)
4575 type
= strip_array_types (type
);
4576 if (TREE_READONLY (decl
))
4577 warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wc___compat
,
4578 "uninitialized const %qD is invalid in C++", decl
);
4579 else if ((TREE_CODE (type
) == RECORD_TYPE
4580 || TREE_CODE (type
) == UNION_TYPE
)
4581 && C_TYPE_FIELDS_READONLY (type
))
4582 diagnose_uninitialized_cst_member (decl
, type
);
4585 invoke_plugin_callbacks (PLUGIN_FINISH_DECL
, decl
);
4588 /* Given a parsed parameter declaration, decode it into a PARM_DECL.
4589 EXPR is NULL or a pointer to an expression that needs to be
4590 evaluated for the side effects of array size expressions in the
4594 grokparm (const struct c_parm
*parm
, tree
*expr
)
4596 tree attrs
= parm
->attrs
;
4597 tree decl
= grokdeclarator (parm
->declarator
, parm
->specs
, PARM
, false,
4598 NULL
, &attrs
, expr
, NULL
, DEPRECATED_NORMAL
);
4600 decl_attributes (&decl
, attrs
, 0);
4605 /* Given a parsed parameter declaration, decode it into a PARM_DECL
4606 and push that on the current scope. EXPR is a pointer to an
4607 expression that needs to be evaluated for the side effects of array
4608 size expressions in the parameters. */
4611 push_parm_decl (const struct c_parm
*parm
, tree
*expr
)
4613 tree attrs
= parm
->attrs
;
4616 decl
= grokdeclarator (parm
->declarator
, parm
->specs
, PARM
, false, NULL
,
4617 &attrs
, expr
, NULL
, DEPRECATED_NORMAL
);
4618 decl_attributes (&decl
, attrs
, 0);
4620 decl
= pushdecl (decl
);
4622 finish_decl (decl
, input_location
, NULL_TREE
, NULL_TREE
, NULL_TREE
);
4625 /* Mark all the parameter declarations to date as forward decls.
4626 Also diagnose use of this extension. */
4629 mark_forward_parm_decls (void)
4631 struct c_binding
*b
;
4633 if (pedantic
&& !current_scope
->warned_forward_parm_decls
)
4635 pedwarn (input_location
, OPT_Wpedantic
,
4636 "ISO C forbids forward parameter declarations");
4637 current_scope
->warned_forward_parm_decls
= true;
4640 for (b
= current_scope
->bindings
; b
; b
= b
->prev
)
4641 if (TREE_CODE (b
->decl
) == PARM_DECL
)
4642 TREE_ASM_WRITTEN (b
->decl
) = 1;
4645 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
4646 literal, which may be an incomplete array type completed by the
4647 initializer; INIT is a CONSTRUCTOR at LOC that initializes the compound
4648 literal. NON_CONST is true if the initializers contain something
4649 that cannot occur in a constant expression. */
4652 build_compound_literal (location_t loc
, tree type
, tree init
, bool non_const
)
4654 /* We do not use start_decl here because we have a type, not a declarator;
4655 and do not use finish_decl because the decl should be stored inside
4656 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_EXPR. */
4661 if (type
== error_mark_node
4662 || init
== error_mark_node
)
4663 return error_mark_node
;
4665 decl
= build_decl (loc
, VAR_DECL
, NULL_TREE
, type
);
4666 DECL_EXTERNAL (decl
) = 0;
4667 TREE_PUBLIC (decl
) = 0;
4668 TREE_STATIC (decl
) = (current_scope
== file_scope
);
4669 DECL_CONTEXT (decl
) = current_function_decl
;
4670 TREE_USED (decl
) = 1;
4671 DECL_READ_P (decl
) = 1;
4672 TREE_TYPE (decl
) = type
;
4673 TREE_READONLY (decl
) = (TYPE_READONLY (type
)
4674 || (TREE_CODE (type
) == ARRAY_TYPE
4675 && TYPE_READONLY (TREE_TYPE (type
))));
4676 store_init_value (loc
, decl
, init
, NULL_TREE
);
4678 if (TREE_CODE (type
) == ARRAY_TYPE
&& !COMPLETE_TYPE_P (type
))
4680 int failure
= complete_array_type (&TREE_TYPE (decl
),
4681 DECL_INITIAL (decl
), true);
4682 gcc_assert (!failure
);
4684 type
= TREE_TYPE (decl
);
4685 TREE_TYPE (DECL_INITIAL (decl
)) = type
;
4688 if (type
== error_mark_node
|| !COMPLETE_TYPE_P (type
))
4690 c_incomplete_type_error (NULL_TREE
, type
);
4691 return error_mark_node
;
4694 stmt
= build_stmt (DECL_SOURCE_LOCATION (decl
), DECL_EXPR
, decl
);
4695 complit
= build1 (COMPOUND_LITERAL_EXPR
, type
, stmt
);
4696 TREE_SIDE_EFFECTS (complit
) = 1;
4698 layout_decl (decl
, 0);
4700 if (TREE_STATIC (decl
))
4702 /* This decl needs a name for the assembler output. */
4703 set_compound_literal_name (decl
);
4704 DECL_DEFER_OUTPUT (decl
) = 1;
4705 DECL_COMDAT (decl
) = 1;
4706 DECL_ARTIFICIAL (decl
) = 1;
4707 DECL_IGNORED_P (decl
) = 1;
4709 rest_of_decl_compilation (decl
, 1, 0);
4714 complit
= build2 (C_MAYBE_CONST_EXPR
, type
, NULL
, complit
);
4715 C_MAYBE_CONST_EXPR_NON_CONST (complit
) = 1;
4721 /* Check the type of a compound literal. Here we just check that it
4722 is valid for C++. */
4725 check_compound_literal_type (location_t loc
, struct c_type_name
*type_name
)
4728 && (type_name
->specs
->typespec_kind
== ctsk_tagdef
4729 || type_name
->specs
->typespec_kind
== ctsk_tagfirstref
))
4730 warning_at (loc
, OPT_Wc___compat
,
4731 "defining a type in a compound literal is invalid in C++");
4734 /* Determine whether TYPE is a structure with a flexible array member,
4735 or a union containing such a structure (possibly recursively). */
4738 flexible_array_type_p (tree type
)
4741 switch (TREE_CODE (type
))
4744 x
= TYPE_FIELDS (type
);
4747 while (DECL_CHAIN (x
) != NULL_TREE
)
4749 if (TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
4750 && TYPE_SIZE (TREE_TYPE (x
)) == NULL_TREE
4751 && TYPE_DOMAIN (TREE_TYPE (x
)) != NULL_TREE
4752 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x
))) == NULL_TREE
)
4756 for (x
= TYPE_FIELDS (type
); x
!= NULL_TREE
; x
= DECL_CHAIN (x
))
4758 if (flexible_array_type_p (TREE_TYPE (x
)))
4767 /* Performs sanity checks on the TYPE and WIDTH of the bit-field NAME,
4768 replacing with appropriate values if they are invalid. */
4770 check_bitfield_type_and_width (tree
*type
, tree
*width
, tree orig_name
)
4773 unsigned int max_width
;
4774 unsigned HOST_WIDE_INT w
;
4775 const char *name
= (orig_name
4776 ? identifier_to_locale (IDENTIFIER_POINTER (orig_name
))
4777 : _("<anonymous>"));
4779 /* Detect and ignore out of range field width and process valid
4781 if (!INTEGRAL_TYPE_P (TREE_TYPE (*width
)))
4783 error ("bit-field %qs width not an integer constant", name
);
4784 *width
= integer_one_node
;
4788 if (TREE_CODE (*width
) != INTEGER_CST
)
4790 *width
= c_fully_fold (*width
, false, NULL
);
4791 if (TREE_CODE (*width
) == INTEGER_CST
)
4792 pedwarn (input_location
, OPT_Wpedantic
,
4793 "bit-field %qs width not an integer constant expression",
4796 if (TREE_CODE (*width
) != INTEGER_CST
)
4798 error ("bit-field %qs width not an integer constant", name
);
4799 *width
= integer_one_node
;
4801 constant_expression_warning (*width
);
4802 if (tree_int_cst_sgn (*width
) < 0)
4804 error ("negative width in bit-field %qs", name
);
4805 *width
= integer_one_node
;
4807 else if (integer_zerop (*width
) && orig_name
)
4809 error ("zero width for bit-field %qs", name
);
4810 *width
= integer_one_node
;
4814 /* Detect invalid bit-field type. */
4815 if (TREE_CODE (*type
) != INTEGER_TYPE
4816 && TREE_CODE (*type
) != BOOLEAN_TYPE
4817 && TREE_CODE (*type
) != ENUMERAL_TYPE
)
4819 error ("bit-field %qs has invalid type", name
);
4820 *type
= unsigned_type_node
;
4823 type_mv
= TYPE_MAIN_VARIANT (*type
);
4824 if (!in_system_header
4825 && type_mv
!= integer_type_node
4826 && type_mv
!= unsigned_type_node
4827 && type_mv
!= boolean_type_node
)
4828 pedwarn (input_location
, OPT_Wpedantic
,
4829 "type of bit-field %qs is a GCC extension", name
);
4831 max_width
= TYPE_PRECISION (*type
);
4833 if (0 < compare_tree_int (*width
, max_width
))
4835 error ("width of %qs exceeds its type", name
);
4837 *width
= build_int_cst (integer_type_node
, w
);
4840 w
= tree_to_uhwi (*width
);
4842 if (TREE_CODE (*type
) == ENUMERAL_TYPE
)
4844 struct lang_type
*lt
= TYPE_LANG_SPECIFIC (*type
);
4846 || w
< tree_int_cst_min_precision (lt
->enum_min
, TYPE_SIGN (*type
))
4847 || w
< tree_int_cst_min_precision (lt
->enum_max
, TYPE_SIGN (*type
)))
4848 warning (0, "%qs is narrower than values of its type", name
);
4854 /* Print warning about variable length array if necessary. */
4857 warn_variable_length_array (tree name
, tree size
)
4859 int const_size
= TREE_CONSTANT (size
);
4861 if (!flag_isoc99
&& pedantic
&& warn_vla
!= 0)
4866 pedwarn (input_location
, OPT_Wvla
,
4867 "ISO C90 forbids array %qE whose size "
4868 "can%'t be evaluated",
4871 pedwarn (input_location
, OPT_Wvla
, "ISO C90 forbids array whose size "
4872 "can%'t be evaluated");
4877 pedwarn (input_location
, OPT_Wvla
,
4878 "ISO C90 forbids variable length array %qE",
4881 pedwarn (input_location
, OPT_Wvla
, "ISO C90 forbids variable length array");
4884 else if (warn_vla
> 0)
4890 "the size of array %qE can"
4891 "%'t be evaluated", name
);
4894 "the size of array can %'t be evaluated");
4900 "variable length array %qE is used",
4904 "variable length array is used");
4909 /* Given declspecs and a declarator,
4910 determine the name and type of the object declared
4911 and construct a ..._DECL node for it.
4912 (In one case we can return a ..._TYPE node instead.
4913 For invalid input we sometimes return 0.)
4915 DECLSPECS is a c_declspecs structure for the declaration specifiers.
4917 DECL_CONTEXT says which syntactic context this declaration is in:
4918 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
4919 FUNCDEF for a function definition. Like NORMAL but a few different
4920 error messages in each case. Return value may be zero meaning
4921 this definition is too screwy to try to parse.
4922 PARM for a parameter declaration (either within a function prototype
4923 or before a function body). Make a PARM_DECL, or return void_type_node.
4924 TYPENAME if for a typename (in a cast or sizeof).
4925 Don't make a DECL node; just return the ..._TYPE node.
4926 FIELD for a struct or union field; make a FIELD_DECL.
4927 INITIALIZED is true if the decl has an initializer.
4928 WIDTH is non-NULL for bit-fields, and is a pointer to an INTEGER_CST node
4929 representing the width of the bit-field.
4930 DECL_ATTRS points to the list of attributes that should be added to this
4931 decl. Any nested attributes that belong on the decl itself will be
4933 If EXPR is not NULL, any expressions that need to be evaluated as
4934 part of evaluating variably modified types will be stored in *EXPR.
4935 If EXPR_CONST_OPERANDS is not NULL, *EXPR_CONST_OPERANDS will be
4936 set to indicate whether operands in *EXPR can be used in constant
4938 DEPRECATED_STATE is a deprecated_states value indicating whether
4939 deprecation warnings should be suppressed.
4941 In the TYPENAME case, DECLARATOR is really an absolute declarator.
4942 It may also be so in the PARM case, for a prototype where the
4943 argument type is specified but not the name.
4945 This function is where the complicated C meanings of `static'
4946 and `extern' are interpreted. */
4949 grokdeclarator (const struct c_declarator
*declarator
,
4950 struct c_declspecs
*declspecs
,
4951 enum decl_context decl_context
, bool initialized
, tree
*width
,
4952 tree
*decl_attrs
, tree
*expr
, bool *expr_const_operands
,
4953 enum deprecated_states deprecated_state
)
4955 tree type
= declspecs
->type
;
4956 bool threadp
= declspecs
->thread_p
;
4957 enum c_storage_class storage_class
= declspecs
->storage_class
;
4962 int type_quals
= TYPE_UNQUALIFIED
;
4963 tree name
= NULL_TREE
;
4964 bool funcdef_flag
= false;
4965 bool funcdef_syntax
= false;
4966 bool size_varies
= false;
4967 tree decl_attr
= declspecs
->decl_attr
;
4968 int array_ptr_quals
= TYPE_UNQUALIFIED
;
4969 tree array_ptr_attrs
= NULL_TREE
;
4970 int array_parm_static
= 0;
4971 bool array_parm_vla_unspec_p
= false;
4972 tree returned_attrs
= NULL_TREE
;
4973 bool bitfield
= width
!= NULL
;
4975 struct c_arg_info
*arg_info
= 0;
4976 addr_space_t as1
, as2
, address_space
;
4977 location_t loc
= UNKNOWN_LOCATION
;
4980 bool expr_const_operands_dummy
;
4981 enum c_declarator_kind first_non_attr_kind
;
4982 unsigned int alignas_align
= 0;
4984 if (TREE_CODE (type
) == ERROR_MARK
)
4985 return error_mark_node
;
4988 if (expr_const_operands
== NULL
)
4989 expr_const_operands
= &expr_const_operands_dummy
;
4991 *expr
= declspecs
->expr
;
4992 *expr_const_operands
= declspecs
->expr_const_operands
;
4994 if (decl_context
== FUNCDEF
)
4995 funcdef_flag
= true, decl_context
= NORMAL
;
4997 /* Look inside a declarator for the name being declared
4998 and get it as an IDENTIFIER_NODE, for an error message. */
5000 const struct c_declarator
*decl
= declarator
;
5002 first_non_attr_kind
= cdk_attrs
;
5012 funcdef_syntax
= (decl
->kind
== cdk_function
);
5013 decl
= decl
->declarator
;
5014 if (first_non_attr_kind
== cdk_attrs
)
5015 first_non_attr_kind
= decl
->kind
;
5019 decl
= decl
->declarator
;
5026 if (first_non_attr_kind
== cdk_attrs
)
5027 first_non_attr_kind
= decl
->kind
;
5036 gcc_assert (decl_context
== PARM
5037 || decl_context
== TYPENAME
5038 || (decl_context
== FIELD
5039 && declarator
->kind
== cdk_id
));
5040 gcc_assert (!initialized
);
5044 /* A function definition's declarator must have the form of
5045 a function declarator. */
5047 if (funcdef_flag
&& !funcdef_syntax
)
5050 /* If this looks like a function definition, make it one,
5051 even if it occurs where parms are expected.
5052 Then store_parm_decls will reject it and not use it as a parm. */
5053 if (decl_context
== NORMAL
&& !funcdef_flag
&& current_scope
->parm_flag
)
5054 decl_context
= PARM
;
5056 if (declspecs
->deprecated_p
&& deprecated_state
!= DEPRECATED_SUPPRESS
)
5057 warn_deprecated_use (declspecs
->type
, declspecs
->decl_attr
);
5059 if ((decl_context
== NORMAL
|| decl_context
== FIELD
)
5060 && current_scope
== file_scope
5061 && variably_modified_type_p (type
, NULL_TREE
))
5064 error_at (loc
, "variably modified %qE at file scope", name
);
5066 error_at (loc
, "variably modified field at file scope");
5067 type
= integer_type_node
;
5070 size_varies
= C_TYPE_VARIABLE_SIZE (type
) != 0;
5072 /* Diagnose defaulting to "int". */
5074 if (declspecs
->default_int_p
&& !in_system_header
)
5076 /* Issue a warning if this is an ISO C 99 program or if
5077 -Wreturn-type and this is a function, or if -Wimplicit;
5078 prefer the former warning since it is more explicit. */
5079 if ((warn_implicit_int
|| warn_return_type
|| flag_isoc99
)
5081 warn_about_return_type
= 1;
5085 pedwarn_c99 (loc
, flag_isoc99
? 0 : OPT_Wimplicit_int
,
5086 "type defaults to %<int%> in declaration of %qE",
5089 pedwarn_c99 (input_location
, flag_isoc99
? 0 : OPT_Wimplicit_int
,
5090 "type defaults to %<int%> in type name");
5094 /* Adjust the type if a bit-field is being declared,
5095 -funsigned-bitfields applied and the type is not explicitly
5097 if (bitfield
&& !flag_signed_bitfields
&& !declspecs
->explicit_signed_p
5098 && TREE_CODE (type
) == INTEGER_TYPE
)
5099 type
= unsigned_type_for (type
);
5101 /* Figure out the type qualifiers for the declaration. There are
5102 two ways a declaration can become qualified. One is something
5103 like `const int i' where the `const' is explicit. Another is
5104 something like `typedef const int CI; CI i' where the type of the
5105 declaration contains the `const'. A third possibility is that
5106 there is a type qualifier on the element type of a typedefed
5107 array type, in which case we should extract that qualifier so
5108 that c_apply_type_quals_to_decl receives the full list of
5109 qualifiers to work with (C90 is not entirely clear about whether
5110 duplicate qualifiers should be diagnosed in this case, but it
5111 seems most appropriate to do so). */
5112 element_type
= strip_array_types (type
);
5113 constp
= declspecs
->const_p
+ TYPE_READONLY (element_type
);
5114 restrictp
= declspecs
->restrict_p
+ TYPE_RESTRICT (element_type
);
5115 volatilep
= declspecs
->volatile_p
+ TYPE_VOLATILE (element_type
);
5116 atomicp
= declspecs
->atomic_p
+ TYPE_ATOMIC (element_type
);
5117 as1
= declspecs
->address_space
;
5118 as2
= TYPE_ADDR_SPACE (element_type
);
5119 address_space
= ADDR_SPACE_GENERIC_P (as1
)? as2
: as1
;
5121 if (pedantic
&& !flag_isoc99
)
5124 pedwarn (loc
, OPT_Wpedantic
, "duplicate %<const%>");
5126 pedwarn (loc
, OPT_Wpedantic
, "duplicate %<restrict%>");
5128 pedwarn (loc
, OPT_Wpedantic
, "duplicate %<volatile%>");
5130 pedwarn (loc
, OPT_Wpedantic
, "duplicate %<_Atomic%>");
5134 if (!ADDR_SPACE_GENERIC_P (as1
) && !ADDR_SPACE_GENERIC_P (as2
) && as1
!= as2
)
5135 error_at (loc
, "conflicting named address spaces (%s vs %s)",
5136 c_addr_space_name (as1
), c_addr_space_name (as2
));
5138 if ((TREE_CODE (type
) == ARRAY_TYPE
5139 || first_non_attr_kind
== cdk_array
)
5140 && TYPE_QUALS (element_type
))
5141 type
= TYPE_MAIN_VARIANT (type
);
5142 type_quals
= ((constp
? TYPE_QUAL_CONST
: 0)
5143 | (restrictp
? TYPE_QUAL_RESTRICT
: 0)
5144 | (volatilep
? TYPE_QUAL_VOLATILE
: 0)
5145 | (atomicp
? TYPE_QUAL_ATOMIC
: 0)
5146 | ENCODE_QUAL_ADDR_SPACE (address_space
));
5148 /* Applying the _Atomic qualifier to an array type (through the use
5149 of typedefs or typeof) must be detected here. If the qualifier
5150 is introduced later, any appearance of applying it to an array is
5151 actually applying it to an element of that array. */
5152 if (atomicp
&& TREE_CODE (type
) == ARRAY_TYPE
)
5153 error_at (loc
, "%<_Atomic%>-qualified array type");
5155 /* Warn about storage classes that are invalid for certain
5156 kinds of declarations (parameters, typenames, etc.). */
5160 || storage_class
== csc_auto
5161 || storage_class
== csc_register
5162 || storage_class
== csc_typedef
))
5164 if (storage_class
== csc_auto
)
5166 (current_scope
== file_scope
) ? 0 : OPT_Wpedantic
,
5167 "function definition declared %<auto%>");
5168 if (storage_class
== csc_register
)
5169 error_at (loc
, "function definition declared %<register%>");
5170 if (storage_class
== csc_typedef
)
5171 error_at (loc
, "function definition declared %<typedef%>");
5173 error_at (loc
, "function definition declared %qs",
5174 declspecs
->thread_gnu_p
? "__thread" : "_Thread_local");
5176 if (storage_class
== csc_auto
5177 || storage_class
== csc_register
5178 || storage_class
== csc_typedef
)
5179 storage_class
= csc_none
;
5181 else if (decl_context
!= NORMAL
&& (storage_class
!= csc_none
|| threadp
))
5183 if (decl_context
== PARM
&& storage_class
== csc_register
)
5187 switch (decl_context
)
5191 error_at (loc
, "storage class specified for structure "
5194 error_at (loc
, "storage class specified for structure field");
5198 error_at (loc
, "storage class specified for parameter %qE",
5201 error_at (loc
, "storage class specified for unnamed parameter");
5204 error_at (loc
, "storage class specified for typename");
5207 storage_class
= csc_none
;
5211 else if (storage_class
== csc_extern
5215 /* 'extern' with initialization is invalid if not at file scope. */
5216 if (current_scope
== file_scope
)
5218 /* It is fine to have 'extern const' when compiling at C
5219 and C++ intersection. */
5220 if (!(warn_cxx_compat
&& constp
))
5221 warning_at (loc
, 0, "%qE initialized and declared %<extern%>",
5225 error_at (loc
, "%qE has both %<extern%> and initializer", name
);
5227 else if (current_scope
== file_scope
)
5229 if (storage_class
== csc_auto
)
5230 error_at (loc
, "file-scope declaration of %qE specifies %<auto%>",
5232 if (pedantic
&& storage_class
== csc_register
)
5233 pedwarn (input_location
, OPT_Wpedantic
,
5234 "file-scope declaration of %qE specifies %<register%>", name
);
5238 if (storage_class
== csc_extern
&& funcdef_flag
)
5239 error_at (loc
, "nested function %qE declared %<extern%>", name
);
5240 else if (threadp
&& storage_class
== csc_none
)
5242 error_at (loc
, "function-scope %qE implicitly auto and declared "
5244 declspecs
->thread_gnu_p
? "__thread" : "_Thread_local");
5249 /* Now figure out the structure of the declarator proper.
5250 Descend through it, creating more complex types, until we reach
5251 the declared identifier (or NULL_TREE, in an absolute declarator).
5252 At each stage we maintain an unqualified version of the type
5253 together with any qualifiers that should be applied to it with
5254 c_build_qualified_type; this way, array types including
5255 multidimensional array types are first built up in unqualified
5256 form and then the qualified form is created with
5257 TYPE_MAIN_VARIANT pointing to the unqualified form. */
5259 while (declarator
&& declarator
->kind
!= cdk_id
)
5261 if (type
== error_mark_node
)
5263 declarator
= declarator
->declarator
;
5267 /* Each level of DECLARATOR is either a cdk_array (for ...[..]),
5268 a cdk_pointer (for *...),
5269 a cdk_function (for ...(...)),
5270 a cdk_attrs (for nested attributes),
5271 or a cdk_id (for the name being declared
5272 or the place in an absolute declarator
5273 where the name was omitted).
5274 For the last case, we have just exited the loop.
5276 At this point, TYPE is the type of elements of an array,
5277 or for a function to return, or for a pointer to point to.
5278 After this sequence of ifs, TYPE is the type of the
5279 array or function or pointer, and DECLARATOR has had its
5280 outermost layer removed. */
5282 if (array_ptr_quals
!= TYPE_UNQUALIFIED
5283 || array_ptr_attrs
!= NULL_TREE
5284 || array_parm_static
)
5286 /* Only the innermost declarator (making a parameter be of
5287 array type which is converted to pointer type)
5288 may have static or type qualifiers. */
5289 error_at (loc
, "static or type qualifiers in non-parameter array declarator");
5290 array_ptr_quals
= TYPE_UNQUALIFIED
;
5291 array_ptr_attrs
= NULL_TREE
;
5292 array_parm_static
= 0;
5295 switch (declarator
->kind
)
5299 /* A declarator with embedded attributes. */
5300 tree attrs
= declarator
->u
.attrs
;
5301 const struct c_declarator
*inner_decl
;
5303 declarator
= declarator
->declarator
;
5304 inner_decl
= declarator
;
5305 while (inner_decl
->kind
== cdk_attrs
)
5306 inner_decl
= inner_decl
->declarator
;
5307 if (inner_decl
->kind
== cdk_id
)
5308 attr_flags
|= (int) ATTR_FLAG_DECL_NEXT
;
5309 else if (inner_decl
->kind
== cdk_function
)
5310 attr_flags
|= (int) ATTR_FLAG_FUNCTION_NEXT
;
5311 else if (inner_decl
->kind
== cdk_array
)
5312 attr_flags
|= (int) ATTR_FLAG_ARRAY_NEXT
;
5313 returned_attrs
= decl_attributes (&type
,
5314 chainon (returned_attrs
, attrs
),
5320 tree itype
= NULL_TREE
;
5321 tree size
= declarator
->u
.array
.dimen
;
5322 /* The index is a signed object `sizetype' bits wide. */
5323 tree index_type
= c_common_signed_type (sizetype
);
5325 array_ptr_quals
= declarator
->u
.array
.quals
;
5326 array_ptr_attrs
= declarator
->u
.array
.attrs
;
5327 array_parm_static
= declarator
->u
.array
.static_p
;
5328 array_parm_vla_unspec_p
= declarator
->u
.array
.vla_unspec_p
;
5330 declarator
= declarator
->declarator
;
5332 /* Check for some types that there cannot be arrays of. */
5334 if (VOID_TYPE_P (type
))
5337 error_at (loc
, "declaration of %qE as array of voids", name
);
5339 error_at (loc
, "declaration of type name as array of voids");
5340 type
= error_mark_node
;
5343 if (TREE_CODE (type
) == FUNCTION_TYPE
)
5346 error_at (loc
, "declaration of %qE as array of functions",
5349 error_at (loc
, "declaration of type name as array of "
5351 type
= error_mark_node
;
5354 if (pedantic
&& !in_system_header
&& flexible_array_type_p (type
))
5355 pedwarn (loc
, OPT_Wpedantic
,
5356 "invalid use of structure with flexible array member");
5358 if (size
== error_mark_node
)
5359 type
= error_mark_node
;
5361 if (type
== error_mark_node
)
5364 /* If size was specified, set ITYPE to a range-type for
5365 that size. Otherwise, ITYPE remains null. finish_decl
5366 may figure it out from an initial value. */
5370 bool size_maybe_const
= true;
5371 bool size_int_const
= (TREE_CODE (size
) == INTEGER_CST
5372 && !TREE_OVERFLOW (size
));
5373 bool this_size_varies
= false;
5375 /* Strip NON_LVALUE_EXPRs since we aren't using as an
5377 STRIP_TYPE_NOPS (size
);
5379 if (!INTEGRAL_TYPE_P (TREE_TYPE (size
)))
5382 error_at (loc
, "size of array %qE has non-integer type",
5386 "size of unnamed array has non-integer type");
5387 size
= integer_one_node
;
5390 size
= c_fully_fold (size
, false, &size_maybe_const
);
5392 if (pedantic
&& size_maybe_const
&& integer_zerop (size
))
5395 pedwarn (loc
, OPT_Wpedantic
,
5396 "ISO C forbids zero-size array %qE", name
);
5398 pedwarn (loc
, OPT_Wpedantic
,
5399 "ISO C forbids zero-size array");
5402 if (TREE_CODE (size
) == INTEGER_CST
&& size_maybe_const
)
5404 constant_expression_warning (size
);
5405 if (tree_int_cst_sgn (size
) < 0)
5408 error_at (loc
, "size of array %qE is negative", name
);
5410 error_at (loc
, "size of unnamed array is negative");
5411 size
= integer_one_node
;
5413 /* Handle a size folded to an integer constant but
5414 not an integer constant expression. */
5415 if (!size_int_const
)
5417 /* If this is a file scope declaration of an
5418 ordinary identifier, this is invalid code;
5419 diagnosing it here and not subsequently
5420 treating the type as variable-length avoids
5421 more confusing diagnostics later. */
5422 if ((decl_context
== NORMAL
|| decl_context
== FIELD
)
5423 && current_scope
== file_scope
)
5424 pedwarn (input_location
, 0,
5425 "variably modified %qE at file scope",
5428 this_size_varies
= size_varies
= true;
5429 warn_variable_length_array (name
, size
);
5432 else if ((decl_context
== NORMAL
|| decl_context
== FIELD
)
5433 && current_scope
== file_scope
)
5435 error_at (loc
, "variably modified %qE at file scope", name
);
5436 size
= integer_one_node
;
5440 /* Make sure the array size remains visibly
5441 nonconstant even if it is (eg) a const variable
5442 with known value. */
5443 this_size_varies
= size_varies
= true;
5444 warn_variable_length_array (name
, size
);
5445 if (flag_sanitize
& SANITIZE_VLA
5446 && decl_context
== NORMAL
)
5448 /* Evaluate the array size only once. */
5449 size
= c_save_expr (size
);
5450 size
= c_fully_fold (size
, false, NULL
);
5451 size
= fold_build2 (COMPOUND_EXPR
, TREE_TYPE (size
),
5452 ubsan_instrument_vla (loc
, size
),
5457 if (integer_zerop (size
) && !this_size_varies
)
5459 /* A zero-length array cannot be represented with
5460 an unsigned index type, which is what we'll
5461 get with build_index_type. Create an
5462 open-ended range instead. */
5463 itype
= build_range_type (sizetype
, size
, NULL_TREE
);
5467 /* Arrange for the SAVE_EXPR on the inside of the
5468 MINUS_EXPR, which allows the -1 to get folded
5469 with the +1 that happens when building TYPE_SIZE. */
5471 size
= save_expr (size
);
5472 if (this_size_varies
&& TREE_CODE (size
) == INTEGER_CST
)
5473 size
= build2 (COMPOUND_EXPR
, TREE_TYPE (size
),
5474 integer_zero_node
, size
);
5476 /* Compute the maximum valid index, that is, size
5477 - 1. Do the calculation in index_type, so that
5478 if it is a variable the computations will be
5479 done in the proper mode. */
5480 itype
= fold_build2_loc (loc
, MINUS_EXPR
, index_type
,
5481 convert (index_type
, size
),
5482 convert (index_type
,
5485 /* The above overflows when size does not fit
5487 ??? While a size of INT_MAX+1 technically shouldn't
5488 cause an overflow (because we subtract 1), handling
5489 this case seems like an unnecessary complication. */
5490 if (TREE_CODE (size
) == INTEGER_CST
5491 && !int_fits_type_p (size
, index_type
))
5494 error_at (loc
, "size of array %qE is too large",
5497 error_at (loc
, "size of unnamed array is too large");
5498 type
= error_mark_node
;
5502 itype
= build_index_type (itype
);
5504 if (this_size_varies
)
5507 *expr
= build2 (COMPOUND_EXPR
, TREE_TYPE (size
),
5511 *expr_const_operands
&= size_maybe_const
;
5514 else if (decl_context
== FIELD
)
5516 bool flexible_array_member
= false;
5517 if (array_parm_vla_unspec_p
)
5518 /* Field names can in fact have function prototype
5519 scope so [*] is disallowed here through making
5520 the field variably modified, not through being
5521 something other than a declaration with function
5526 const struct c_declarator
*t
= declarator
;
5527 while (t
->kind
== cdk_attrs
)
5529 flexible_array_member
= (t
->kind
== cdk_id
);
5531 if (flexible_array_member
5532 && pedantic
&& !flag_isoc99
&& !in_system_header
)
5533 pedwarn (loc
, OPT_Wpedantic
,
5534 "ISO C90 does not support flexible array members");
5536 /* ISO C99 Flexible array members are effectively
5537 identical to GCC's zero-length array extension. */
5538 if (flexible_array_member
|| array_parm_vla_unspec_p
)
5539 itype
= build_range_type (sizetype
, size_zero_node
,
5542 else if (decl_context
== PARM
)
5544 if (array_parm_vla_unspec_p
)
5546 itype
= build_range_type (sizetype
, size_zero_node
, NULL_TREE
);
5550 else if (decl_context
== TYPENAME
)
5552 if (array_parm_vla_unspec_p
)
5555 warning (0, "%<[*]%> not in a declaration");
5556 /* We use this to avoid messing up with incomplete
5557 array types of the same type, that would
5558 otherwise be modified below. */
5559 itype
= build_range_type (sizetype
, size_zero_node
,
5565 /* Complain about arrays of incomplete types. */
5566 if (!COMPLETE_TYPE_P (type
))
5568 error_at (loc
, "array type has incomplete element type");
5569 type
= error_mark_node
;
5572 /* When itype is NULL, a shared incomplete array type is
5573 returned for all array of a given type. Elsewhere we
5574 make sure we don't complete that type before copying
5575 it, but here we want to make sure we don't ever
5576 modify the shared type, so we gcc_assert (itype)
5579 addr_space_t as
= DECODE_QUAL_ADDR_SPACE (type_quals
);
5580 if (!ADDR_SPACE_GENERIC_P (as
) && as
!= TYPE_ADDR_SPACE (type
))
5581 type
= build_qualified_type (type
,
5582 ENCODE_QUAL_ADDR_SPACE (as
));
5584 type
= build_array_type (type
, itype
);
5587 if (type
!= error_mark_node
)
5591 /* It is ok to modify type here even if itype is
5592 NULL: if size_varies, we're in a
5593 multi-dimensional array and the inner type has
5594 variable size, so the enclosing shared array type
5596 if (size
&& TREE_CODE (size
) == INTEGER_CST
)
5598 = build_distinct_type_copy (TYPE_MAIN_VARIANT (type
));
5599 C_TYPE_VARIABLE_SIZE (type
) = 1;
5602 /* The GCC extension for zero-length arrays differs from
5603 ISO flexible array members in that sizeof yields
5605 if (size
&& integer_zerop (size
))
5608 type
= build_distinct_type_copy (TYPE_MAIN_VARIANT (type
));
5609 TYPE_SIZE (type
) = bitsize_zero_node
;
5610 TYPE_SIZE_UNIT (type
) = size_zero_node
;
5611 SET_TYPE_STRUCTURAL_EQUALITY (type
);
5613 if (array_parm_vla_unspec_p
)
5616 /* The type is complete. C99 6.7.5.2p4 */
5617 type
= build_distinct_type_copy (TYPE_MAIN_VARIANT (type
));
5618 TYPE_SIZE (type
) = bitsize_zero_node
;
5619 TYPE_SIZE_UNIT (type
) = size_zero_node
;
5620 SET_TYPE_STRUCTURAL_EQUALITY (type
);
5624 if (decl_context
!= PARM
5625 && (array_ptr_quals
!= TYPE_UNQUALIFIED
5626 || array_ptr_attrs
!= NULL_TREE
5627 || array_parm_static
))
5629 error_at (loc
, "static or type qualifiers in non-parameter array declarator");
5630 array_ptr_quals
= TYPE_UNQUALIFIED
;
5631 array_ptr_attrs
= NULL_TREE
;
5632 array_parm_static
= 0;
5638 /* Say it's a definition only for the declarator closest
5639 to the identifier, apart possibly from some
5641 bool really_funcdef
= false;
5645 const struct c_declarator
*t
= declarator
->declarator
;
5646 while (t
->kind
== cdk_attrs
)
5648 really_funcdef
= (t
->kind
== cdk_id
);
5651 /* Declaring a function type. Make sure we have a valid
5652 type for the function to return. */
5653 if (type
== error_mark_node
)
5656 size_varies
= false;
5658 /* Warn about some types functions can't return. */
5659 if (TREE_CODE (type
) == FUNCTION_TYPE
)
5662 error_at (loc
, "%qE declared as function returning a "
5665 error_at (loc
, "type name declared as function "
5666 "returning a function");
5667 type
= integer_type_node
;
5669 if (TREE_CODE (type
) == ARRAY_TYPE
)
5672 error_at (loc
, "%qE declared as function returning an array",
5675 error_at (loc
, "type name declared as function returning "
5677 type
= integer_type_node
;
5679 errmsg
= targetm
.invalid_return_type (type
);
5683 type
= integer_type_node
;
5686 /* Construct the function type and go to the next
5687 inner layer of declarator. */
5688 arg_info
= declarator
->u
.arg_info
;
5689 arg_types
= grokparms (arg_info
, really_funcdef
);
5691 /* Type qualifiers before the return type of the function
5692 qualify the return type, not the function type. */
5695 /* Type qualifiers on a function return type are
5696 normally permitted by the standard but have no
5697 effect, so give a warning at -Wreturn-type.
5698 Qualifiers on a void return type are banned on
5699 function definitions in ISO C; GCC used to used
5700 them for noreturn functions. */
5701 if (VOID_TYPE_P (type
) && really_funcdef
)
5703 "function definition has qualified void return type");
5705 warning_at (loc
, OPT_Wignored_qualifiers
,
5706 "type qualifiers ignored on function return type");
5708 type
= c_build_qualified_type (type
, type_quals
);
5710 type_quals
= TYPE_UNQUALIFIED
;
5712 type
= build_function_type (type
, arg_types
);
5713 declarator
= declarator
->declarator
;
5715 /* Set the TYPE_CONTEXTs for each tagged type which is local to
5716 the formal parameter list of this FUNCTION_TYPE to point to
5717 the FUNCTION_TYPE node itself. */
5722 FOR_EACH_VEC_SAFE_ELT_REVERSE (arg_info
->tags
, ix
, tag
)
5723 TYPE_CONTEXT (tag
->type
) = type
;
5729 /* Merge any constancy or volatility into the target type
5731 if ((type_quals
& TYPE_QUAL_ATOMIC
)
5732 && TREE_CODE (type
) == FUNCTION_TYPE
)
5735 "%<_Atomic%>-qualified function type");
5736 type_quals
&= ~TYPE_QUAL_ATOMIC
;
5738 else if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
5740 pedwarn (loc
, OPT_Wpedantic
,
5741 "ISO C forbids qualified function types");
5743 type
= c_build_qualified_type (type
, type_quals
);
5744 size_varies
= false;
5746 /* When the pointed-to type involves components of variable size,
5747 care must be taken to ensure that the size evaluation code is
5748 emitted early enough to dominate all the possible later uses
5749 and late enough for the variables on which it depends to have
5752 This is expected to happen automatically when the pointed-to
5753 type has a name/declaration of it's own, but special attention
5754 is required if the type is anonymous.
5756 We handle the NORMAL and FIELD contexts here by attaching an
5757 artificial TYPE_DECL to such pointed-to type. This forces the
5758 sizes evaluation at a safe point and ensures it is not deferred
5759 until e.g. within a deeper conditional context.
5761 We expect nothing to be needed here for PARM or TYPENAME.
5762 Pushing a TYPE_DECL at this point for TYPENAME would actually
5763 be incorrect, as we might be in the middle of an expression
5764 with side effects on the pointed-to type size "arguments" prior
5765 to the pointer declaration point and the fake TYPE_DECL in the
5766 enclosing context would force the size evaluation prior to the
5769 if (!TYPE_NAME (type
)
5770 && (decl_context
== NORMAL
|| decl_context
== FIELD
)
5771 && variably_modified_type_p (type
, NULL_TREE
))
5773 tree decl
= build_decl (loc
, TYPE_DECL
, NULL_TREE
, type
);
5774 DECL_ARTIFICIAL (decl
) = 1;
5776 finish_decl (decl
, loc
, NULL_TREE
, NULL_TREE
, NULL_TREE
);
5777 TYPE_NAME (type
) = decl
;
5780 type
= c_build_pointer_type (type
);
5782 /* Process type qualifiers (such as const or volatile)
5783 that were given inside the `*'. */
5784 type_quals
= declarator
->u
.pointer_quals
;
5786 declarator
= declarator
->declarator
;
5793 *decl_attrs
= chainon (returned_attrs
, *decl_attrs
);
5795 /* Now TYPE has the actual type, apart from any qualifiers in
5798 /* Warn about address space used for things other than static memory or
5800 address_space
= DECODE_QUAL_ADDR_SPACE (type_quals
);
5801 if (!ADDR_SPACE_GENERIC_P (address_space
))
5803 if (decl_context
== NORMAL
)
5805 switch (storage_class
)
5808 error ("%qs combined with %<auto%> qualifier for %qE",
5809 c_addr_space_name (address_space
), name
);
5812 error ("%qs combined with %<register%> qualifier for %qE",
5813 c_addr_space_name (address_space
), name
);
5816 if (current_function_scope
)
5818 error ("%qs specified for auto variable %qE",
5819 c_addr_space_name (address_space
), name
);
5831 else if (decl_context
== PARM
&& TREE_CODE (type
) != ARRAY_TYPE
)
5834 error ("%qs specified for parameter %qE",
5835 c_addr_space_name (address_space
), name
);
5837 error ("%qs specified for unnamed parameter",
5838 c_addr_space_name (address_space
));
5840 else if (decl_context
== FIELD
)
5843 error ("%qs specified for structure field %qE",
5844 c_addr_space_name (address_space
), name
);
5846 error ("%qs specified for structure field",
5847 c_addr_space_name (address_space
));
5851 /* Check the type and width of a bit-field. */
5854 check_bitfield_type_and_width (&type
, width
, name
);
5855 /* C11 makes it implementation-defined (6.7.2.1#5) whether
5856 atomic types are permitted for bit-fields; we have no code to
5857 make bit-field accesses atomic, so disallow them. */
5858 if (type_quals
& TYPE_QUAL_ATOMIC
)
5861 error ("bit-field %qE has atomic type", name
);
5863 error ("bit-field has atomic type");
5864 type_quals
&= ~TYPE_QUAL_ATOMIC
;
5868 /* Reject invalid uses of _Alignas. */
5869 if (declspecs
->alignas_p
)
5871 if (storage_class
== csc_typedef
)
5872 error_at (loc
, "alignment specified for typedef %qE", name
);
5873 else if (storage_class
== csc_register
)
5874 error_at (loc
, "alignment specified for %<register%> object %qE",
5876 else if (decl_context
== PARM
)
5879 error_at (loc
, "alignment specified for parameter %qE", name
);
5881 error_at (loc
, "alignment specified for unnamed parameter");
5886 error_at (loc
, "alignment specified for bit-field %qE", name
);
5888 error_at (loc
, "alignment specified for unnamed bit-field");
5890 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
5891 error_at (loc
, "alignment specified for function %qE", name
);
5892 else if (declspecs
->align_log
!= -1)
5894 alignas_align
= 1U << declspecs
->align_log
;
5895 if (alignas_align
< TYPE_ALIGN_UNIT (type
))
5898 error_at (loc
, "%<_Alignas%> specifiers cannot reduce "
5899 "alignment of %qE", name
);
5901 error_at (loc
, "%<_Alignas%> specifiers cannot reduce "
5902 "alignment of unnamed field");
5908 /* Did array size calculations overflow or does the array cover more
5909 than half of the address-space? */
5910 if (TREE_CODE (type
) == ARRAY_TYPE
5911 && COMPLETE_TYPE_P (type
)
5912 && TREE_CODE (TYPE_SIZE_UNIT (type
)) == INTEGER_CST
5913 && ! valid_constant_size_p (TYPE_SIZE_UNIT (type
)))
5916 error_at (loc
, "size of array %qE is too large", name
);
5918 error_at (loc
, "size of unnamed array is too large");
5919 /* If we proceed with the array type as it is, we'll eventually
5920 crash in tree_to_[su]hwi(). */
5921 type
= error_mark_node
;
5924 /* If this is declaring a typedef name, return a TYPE_DECL. */
5926 if (storage_class
== csc_typedef
)
5929 if ((type_quals
& TYPE_QUAL_ATOMIC
)
5930 && TREE_CODE (type
) == FUNCTION_TYPE
)
5933 "%<_Atomic%>-qualified function type");
5934 type_quals
&= ~TYPE_QUAL_ATOMIC
;
5936 else if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
5938 pedwarn (loc
, OPT_Wpedantic
,
5939 "ISO C forbids qualified function types");
5941 type
= c_build_qualified_type (type
, type_quals
);
5942 decl
= build_decl (declarator
->id_loc
,
5943 TYPE_DECL
, declarator
->u
.id
, type
);
5944 if (declspecs
->explicit_signed_p
)
5945 C_TYPEDEF_EXPLICITLY_SIGNED (decl
) = 1;
5946 if (declspecs
->inline_p
)
5947 pedwarn (loc
, 0,"typedef %q+D declared %<inline%>", decl
);
5948 if (declspecs
->noreturn_p
)
5949 pedwarn (loc
, 0,"typedef %q+D declared %<_Noreturn%>", decl
);
5951 if (warn_cxx_compat
&& declarator
->u
.id
!= NULL_TREE
)
5953 struct c_binding
*b
= I_TAG_BINDING (declarator
->u
.id
);
5956 && b
->decl
!= NULL_TREE
5957 && (B_IN_CURRENT_SCOPE (b
)
5958 || (current_scope
== file_scope
&& B_IN_EXTERNAL_SCOPE (b
)))
5959 && TYPE_MAIN_VARIANT (b
->decl
) != TYPE_MAIN_VARIANT (type
))
5961 warning_at (declarator
->id_loc
, OPT_Wc___compat
,
5962 ("using %qD as both a typedef and a tag is "
5965 if (b
->locus
!= UNKNOWN_LOCATION
)
5966 inform (b
->locus
, "originally defined here");
5973 /* If this is a type name (such as, in a cast or sizeof),
5974 compute the type and return it now. */
5976 if (decl_context
== TYPENAME
)
5978 /* Note that the grammar rejects storage classes in typenames
5980 gcc_assert (storage_class
== csc_none
&& !threadp
5981 && !declspecs
->inline_p
&& !declspecs
->noreturn_p
);
5982 if ((type_quals
& TYPE_QUAL_ATOMIC
)
5983 && TREE_CODE (type
) == FUNCTION_TYPE
)
5986 "%<_Atomic%>-qualified function type");
5987 type_quals
&= ~TYPE_QUAL_ATOMIC
;
5989 else if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
5991 pedwarn (loc
, OPT_Wpedantic
,
5992 "ISO C forbids const or volatile function types");
5994 type
= c_build_qualified_type (type
, type_quals
);
5998 if (pedantic
&& decl_context
== FIELD
5999 && variably_modified_type_p (type
, NULL_TREE
))
6002 pedwarn (loc
, OPT_Wpedantic
, "a member of a structure or union cannot "
6003 "have a variably modified type");
6006 /* Aside from typedefs and type names (handle above),
6007 `void' at top level (not within pointer)
6008 is allowed only in public variables.
6009 We don't complain about parms either, but that is because
6010 a better error message can be made later. */
6012 if (VOID_TYPE_P (type
) && decl_context
!= PARM
6013 && !((decl_context
!= FIELD
&& TREE_CODE (type
) != FUNCTION_TYPE
)
6014 && (storage_class
== csc_extern
6015 || (current_scope
== file_scope
6016 && !(storage_class
== csc_static
6017 || storage_class
== csc_register
)))))
6019 error_at (loc
, "variable or field %qE declared void", name
);
6020 type
= integer_type_node
;
6023 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
6024 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
6029 if (decl_context
== PARM
)
6033 /* A parameter declared as an array of T is really a pointer to T.
6034 One declared as a function is really a pointer to a function. */
6036 if (TREE_CODE (type
) == ARRAY_TYPE
)
6038 /* Transfer const-ness of array into that of type pointed to. */
6039 type
= TREE_TYPE (type
);
6041 type
= c_build_qualified_type (type
, type_quals
);
6042 type
= c_build_pointer_type (type
);
6043 type_quals
= array_ptr_quals
;
6045 type
= c_build_qualified_type (type
, type_quals
);
6047 /* We don't yet implement attributes in this context. */
6048 if (array_ptr_attrs
!= NULL_TREE
)
6049 warning_at (loc
, OPT_Wattributes
,
6050 "attributes in parameter array declarator ignored");
6052 size_varies
= false;
6054 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
6056 if (type_quals
& TYPE_QUAL_ATOMIC
)
6059 "%<_Atomic%>-qualified function type");
6060 type_quals
&= ~TYPE_QUAL_ATOMIC
;
6062 else if (type_quals
)
6063 pedwarn (loc
, OPT_Wpedantic
,
6064 "ISO C forbids qualified function types");
6066 type
= c_build_qualified_type (type
, type_quals
);
6067 type
= c_build_pointer_type (type
);
6068 type_quals
= TYPE_UNQUALIFIED
;
6070 else if (type_quals
)
6071 type
= c_build_qualified_type (type
, type_quals
);
6073 decl
= build_decl (declarator
->id_loc
,
6074 PARM_DECL
, declarator
->u
.id
, type
);
6076 C_DECL_VARIABLE_SIZE (decl
) = 1;
6078 /* Compute the type actually passed in the parmlist,
6079 for the case where there is no prototype.
6080 (For example, shorts and chars are passed as ints.)
6081 When there is a prototype, this is overridden later. */
6083 if (type
== error_mark_node
)
6084 promoted_type
= type
;
6086 promoted_type
= c_type_promotes_to (type
);
6088 DECL_ARG_TYPE (decl
) = promoted_type
;
6089 if (declspecs
->inline_p
)
6090 pedwarn (loc
, 0, "parameter %q+D declared %<inline%>", decl
);
6091 if (declspecs
->noreturn_p
)
6092 pedwarn (loc
, 0, "parameter %q+D declared %<_Noreturn%>", decl
);
6094 else if (decl_context
== FIELD
)
6096 /* Note that the grammar rejects storage classes in typenames
6098 gcc_assert (storage_class
== csc_none
&& !threadp
6099 && !declspecs
->inline_p
&& !declspecs
->noreturn_p
);
6101 /* Structure field. It may not be a function. */
6103 if (TREE_CODE (type
) == FUNCTION_TYPE
)
6105 error_at (loc
, "field %qE declared as a function", name
);
6106 type
= build_pointer_type (type
);
6108 else if (TREE_CODE (type
) != ERROR_MARK
6109 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type
))
6112 error_at (loc
, "field %qE has incomplete type", name
);
6114 error_at (loc
, "unnamed field has incomplete type");
6115 type
= error_mark_node
;
6117 type
= c_build_qualified_type (type
, type_quals
);
6118 decl
= build_decl (declarator
->id_loc
,
6119 FIELD_DECL
, declarator
->u
.id
, type
);
6120 DECL_NONADDRESSABLE_P (decl
) = bitfield
;
6121 if (bitfield
&& !declarator
->u
.id
)
6122 TREE_NO_WARNING (decl
) = 1;
6125 C_DECL_VARIABLE_SIZE (decl
) = 1;
6127 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
6129 if (storage_class
== csc_register
|| threadp
)
6131 error_at (loc
, "invalid storage class for function %qE", name
);
6133 else if (current_scope
!= file_scope
)
6135 /* Function declaration not at file scope. Storage
6136 classes other than `extern' are not allowed, C99
6137 6.7.1p5, and `extern' makes no difference. However,
6138 GCC allows 'auto', perhaps with 'inline', to support
6139 nested functions. */
6140 if (storage_class
== csc_auto
)
6141 pedwarn (loc
, OPT_Wpedantic
,
6142 "invalid storage class for function %qE", name
);
6143 else if (storage_class
== csc_static
)
6145 error_at (loc
, "invalid storage class for function %qE", name
);
6147 storage_class
= declspecs
->storage_class
= csc_none
;
6153 decl
= build_decl (declarator
->id_loc
,
6154 FUNCTION_DECL
, declarator
->u
.id
, type
);
6155 decl
= build_decl_attribute_variant (decl
, decl_attr
);
6157 if (type_quals
& TYPE_QUAL_ATOMIC
)
6160 "%<_Atomic%>-qualified function type");
6161 type_quals
&= ~TYPE_QUAL_ATOMIC
;
6163 else if (pedantic
&& type_quals
&& !DECL_IN_SYSTEM_HEADER (decl
))
6164 pedwarn (loc
, OPT_Wpedantic
,
6165 "ISO C forbids qualified function types");
6167 /* Every function declaration is an external reference
6168 (DECL_EXTERNAL) except for those which are not at file
6169 scope and are explicitly declared "auto". This is
6170 forbidden by standard C (C99 6.7.1p5) and is interpreted by
6171 GCC to signify a forward declaration of a nested function. */
6172 if (storage_class
== csc_auto
&& current_scope
!= file_scope
)
6173 DECL_EXTERNAL (decl
) = 0;
6174 /* In C99, a function which is declared 'inline' with 'extern'
6175 is not an external reference (which is confusing). It
6176 means that the later definition of the function must be output
6177 in this file, C99 6.7.4p6. In GNU C89, a function declared
6178 'extern inline' is an external reference. */
6179 else if (declspecs
->inline_p
&& storage_class
!= csc_static
)
6180 DECL_EXTERNAL (decl
) = ((storage_class
== csc_extern
)
6181 == flag_gnu89_inline
);
6183 DECL_EXTERNAL (decl
) = !initialized
;
6185 /* Record absence of global scope for `static' or `auto'. */
6187 = !(storage_class
== csc_static
|| storage_class
== csc_auto
);
6189 /* For a function definition, record the argument information
6190 block where store_parm_decls will look for it. */
6192 current_function_arg_info
= arg_info
;
6194 if (declspecs
->default_int_p
)
6195 C_FUNCTION_IMPLICIT_INT (decl
) = 1;
6197 /* Record presence of `inline' and `_Noreturn', if it is
6199 if (flag_hosted
&& MAIN_NAME_P (declarator
->u
.id
))
6201 if (declspecs
->inline_p
)
6202 pedwarn (loc
, 0, "cannot inline function %<main%>");
6203 if (declspecs
->noreturn_p
)
6204 pedwarn (loc
, 0, "%<main%> declared %<_Noreturn%>");
6208 if (declspecs
->inline_p
)
6209 /* Record that the function is declared `inline'. */
6210 DECL_DECLARED_INLINE_P (decl
) = 1;
6211 if (declspecs
->noreturn_p
)
6216 pedwarn (loc
, OPT_Wpedantic
,
6217 "ISO C99 does not support %<_Noreturn%>");
6219 pedwarn (loc
, OPT_Wpedantic
,
6220 "ISO C90 does not support %<_Noreturn%>");
6222 TREE_THIS_VOLATILE (decl
) = 1;
6228 /* It's a variable. */
6229 /* An uninitialized decl with `extern' is a reference. */
6230 int extern_ref
= !initialized
&& storage_class
== csc_extern
;
6232 type
= c_build_qualified_type (type
, type_quals
);
6234 /* C99 6.2.2p7: It is invalid (compile-time undefined
6235 behavior) to create an 'extern' declaration for a
6236 variable if there is a global declaration that is
6237 'static' and the global declaration is not visible.
6238 (If the static declaration _is_ currently visible,
6239 the 'extern' declaration is taken to refer to that decl.) */
6240 if (extern_ref
&& current_scope
!= file_scope
)
6242 tree global_decl
= identifier_global_value (declarator
->u
.id
);
6243 tree visible_decl
= lookup_name (declarator
->u
.id
);
6246 && global_decl
!= visible_decl
6247 && TREE_CODE (global_decl
) == VAR_DECL
6248 && !TREE_PUBLIC (global_decl
))
6249 error_at (loc
, "variable previously declared %<static%> "
6250 "redeclared %<extern%>");
6253 decl
= build_decl (declarator
->id_loc
,
6254 VAR_DECL
, declarator
->u
.id
, type
);
6256 C_DECL_VARIABLE_SIZE (decl
) = 1;
6258 if (declspecs
->inline_p
)
6259 pedwarn (loc
, 0, "variable %q+D declared %<inline%>", decl
);
6260 if (declspecs
->noreturn_p
)
6261 pedwarn (loc
, 0, "variable %q+D declared %<_Noreturn%>", decl
);
6263 /* At file scope, an initialized extern declaration may follow
6264 a static declaration. In that case, DECL_EXTERNAL will be
6265 reset later in start_decl. */
6266 DECL_EXTERNAL (decl
) = (storage_class
== csc_extern
);
6268 /* At file scope, the presence of a `static' or `register' storage
6269 class specifier, or the absence of all storage class specifiers
6270 makes this declaration a definition (perhaps tentative). Also,
6271 the absence of `static' makes it public. */
6272 if (current_scope
== file_scope
)
6274 TREE_PUBLIC (decl
) = storage_class
!= csc_static
;
6275 TREE_STATIC (decl
) = !extern_ref
;
6277 /* Not at file scope, only `static' makes a static definition. */
6280 TREE_STATIC (decl
) = (storage_class
== csc_static
);
6281 TREE_PUBLIC (decl
) = extern_ref
;
6285 DECL_TLS_MODEL (decl
) = decl_default_tls_model (decl
);
6288 if ((storage_class
== csc_extern
6289 || (storage_class
== csc_none
6290 && TREE_CODE (type
) == FUNCTION_TYPE
6292 && variably_modified_type_p (type
, NULL_TREE
))
6295 if (TREE_CODE (type
) == FUNCTION_TYPE
)
6296 error_at (loc
, "non-nested function with variably modified type");
6298 error_at (loc
, "object with variably modified type must have "
6302 /* Record `register' declaration for warnings on &
6303 and in case doing stupid register allocation. */
6305 if (storage_class
== csc_register
)
6307 C_DECL_REGISTER (decl
) = 1;
6308 DECL_REGISTER (decl
) = 1;
6311 /* Record constancy and volatility. */
6312 c_apply_type_quals_to_decl (type_quals
, decl
);
6314 /* Apply _Alignas specifiers. */
6317 DECL_ALIGN (decl
) = alignas_align
* BITS_PER_UNIT
;
6318 DECL_USER_ALIGN (decl
) = 1;
6321 /* If a type has volatile components, it should be stored in memory.
6322 Otherwise, the fact that those components are volatile
6323 will be ignored, and would even crash the compiler.
6324 Of course, this only makes sense on VAR,PARM, and RESULT decl's. */
6325 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl
))
6326 && (TREE_CODE (decl
) == VAR_DECL
|| TREE_CODE (decl
) == PARM_DECL
6327 || TREE_CODE (decl
) == RESULT_DECL
))
6329 /* It is not an error for a structure with volatile fields to
6330 be declared register, but reset DECL_REGISTER since it
6331 cannot actually go in a register. */
6332 int was_reg
= C_DECL_REGISTER (decl
);
6333 C_DECL_REGISTER (decl
) = 0;
6334 DECL_REGISTER (decl
) = 0;
6335 c_mark_addressable (decl
);
6336 C_DECL_REGISTER (decl
) = was_reg
;
6339 /* This is the earliest point at which we might know the assembler
6340 name of a variable. Thus, if it's known before this, die horribly. */
6341 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl
));
6344 && TREE_CODE (decl
) == VAR_DECL
6345 && TREE_PUBLIC (decl
)
6346 && TREE_STATIC (decl
)
6347 && (TREE_CODE (TREE_TYPE (decl
)) == RECORD_TYPE
6348 || TREE_CODE (TREE_TYPE (decl
)) == UNION_TYPE
6349 || TREE_CODE (TREE_TYPE (decl
)) == ENUMERAL_TYPE
)
6350 && TYPE_NAME (TREE_TYPE (decl
)) == NULL_TREE
)
6351 warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wc___compat
,
6352 ("non-local variable %qD with anonymous type is "
6353 "questionable in C++"),
6360 /* Decode the parameter-list info for a function type or function definition.
6361 The argument is the value returned by `get_parm_info' (or made in c-parse.c
6362 if there is an identifier list instead of a parameter decl list).
6363 These two functions are separate because when a function returns
6364 or receives functions then each is called multiple times but the order
6365 of calls is different. The last call to `grokparms' is always the one
6366 that contains the formal parameter names of a function definition.
6368 Return a list of arg types to use in the FUNCTION_TYPE for this function.
6370 FUNCDEF_FLAG is true for a function definition, false for
6371 a mere declaration. A nonempty identifier-list gets an error message
6372 when FUNCDEF_FLAG is false. */
6375 grokparms (struct c_arg_info
*arg_info
, bool funcdef_flag
)
6377 tree arg_types
= arg_info
->types
;
6379 if (funcdef_flag
&& arg_info
->had_vla_unspec
)
6381 /* A function definition isn't function prototype scope C99 6.2.1p4. */
6383 error ("%<[*]%> not allowed in other than function prototype scope");
6386 if (arg_types
== 0 && !funcdef_flag
&& !in_system_header
)
6387 warning (OPT_Wstrict_prototypes
,
6388 "function declaration isn%'t a prototype");
6390 if (arg_types
== error_mark_node
)
6391 return 0; /* don't set TYPE_ARG_TYPES in this case */
6393 else if (arg_types
&& TREE_CODE (TREE_VALUE (arg_types
)) == IDENTIFIER_NODE
)
6397 pedwarn (input_location
, 0, "parameter names (without types) in function declaration");
6398 arg_info
->parms
= NULL_TREE
;
6401 arg_info
->parms
= arg_info
->types
;
6403 arg_info
->types
= 0;
6408 tree parm
, type
, typelt
;
6409 unsigned int parmno
;
6412 /* If there is a parameter of incomplete type in a definition,
6413 this is an error. In a declaration this is valid, and a
6414 struct or union type may be completed later, before any calls
6415 or definition of the function. In the case where the tag was
6416 first declared within the parameter list, a warning has
6417 already been given. If a parameter has void type, then
6418 however the function cannot be defined or called, so
6421 for (parm
= arg_info
->parms
, typelt
= arg_types
, parmno
= 1;
6423 parm
= DECL_CHAIN (parm
), typelt
= TREE_CHAIN (typelt
), parmno
++)
6425 type
= TREE_VALUE (typelt
);
6426 if (type
== error_mark_node
)
6429 if (!COMPLETE_TYPE_P (type
))
6433 if (DECL_NAME (parm
))
6434 error_at (input_location
,
6435 "parameter %u (%q+D) has incomplete type",
6438 error_at (DECL_SOURCE_LOCATION (parm
),
6439 "parameter %u has incomplete type",
6442 TREE_VALUE (typelt
) = error_mark_node
;
6443 TREE_TYPE (parm
) = error_mark_node
;
6444 arg_types
= NULL_TREE
;
6446 else if (VOID_TYPE_P (type
))
6448 if (DECL_NAME (parm
))
6449 warning_at (input_location
, 0,
6450 "parameter %u (%q+D) has void type",
6453 warning_at (DECL_SOURCE_LOCATION (parm
), 0,
6454 "parameter %u has void type",
6459 errmsg
= targetm
.invalid_parameter_type (type
);
6463 TREE_VALUE (typelt
) = error_mark_node
;
6464 TREE_TYPE (parm
) = error_mark_node
;
6465 arg_types
= NULL_TREE
;
6468 if (DECL_NAME (parm
) && TREE_USED (parm
))
6469 warn_if_shadowing (parm
);
6475 /* Allocate and initialize a c_arg_info structure from the parser's
6479 build_arg_info (void)
6481 struct c_arg_info
*ret
= XOBNEW (&parser_obstack
, struct c_arg_info
);
6482 ret
->parms
= NULL_TREE
;
6484 ret
->types
= NULL_TREE
;
6485 ret
->others
= NULL_TREE
;
6486 ret
->pending_sizes
= NULL
;
6487 ret
->had_vla_unspec
= 0;
6491 /* Take apart the current scope and return a c_arg_info structure with
6492 info on a parameter list just parsed.
6494 This structure is later fed to 'grokparms' and 'store_parm_decls'.
6496 ELLIPSIS being true means the argument list ended in '...' so don't
6497 append a sentinel (void_list_node) to the end of the type-list.
6499 EXPR is NULL or an expression that needs to be evaluated for the
6500 side effects of array size expressions in the parameters. */
6503 get_parm_info (bool ellipsis
, tree expr
)
6505 struct c_binding
*b
= current_scope
->bindings
;
6506 struct c_arg_info
*arg_info
= build_arg_info ();
6509 vec
<c_arg_tag
, va_gc
> *tags
= NULL
;
6513 static bool explained_incomplete_types
= false;
6514 bool gave_void_only_once_err
= false;
6516 arg_info
->had_vla_unspec
= current_scope
->had_vla_unspec
;
6518 /* The bindings in this scope must not get put into a block.
6519 We will take care of deleting the binding nodes. */
6520 current_scope
->bindings
= 0;
6522 /* This function is only called if there was *something* on the
6526 /* A parameter list consisting solely of 'void' indicates that the
6527 function takes no arguments. But if the 'void' is qualified
6528 (by 'const' or 'volatile'), or has a storage class specifier
6529 ('register'), then the behavior is undefined; issue an error.
6530 Typedefs for 'void' are OK (see DR#157). */
6531 if (b
->prev
== 0 /* one binding */
6532 && TREE_CODE (b
->decl
) == PARM_DECL
/* which is a parameter */
6533 && !DECL_NAME (b
->decl
) /* anonymous */
6534 && VOID_TYPE_P (TREE_TYPE (b
->decl
))) /* of void type */
6536 if (TYPE_QUALS (TREE_TYPE (b
->decl
)) != TYPE_UNQUALIFIED
6537 || C_DECL_REGISTER (b
->decl
))
6538 error ("%<void%> as only parameter may not be qualified");
6540 /* There cannot be an ellipsis. */
6542 error ("%<void%> must be the only parameter");
6544 arg_info
->types
= void_list_node
;
6549 types
= void_list_node
;
6551 /* Break up the bindings list into parms, tags, types, and others;
6552 apply sanity checks; purge the name-to-decl bindings. */
6555 tree decl
= b
->decl
;
6556 tree type
= TREE_TYPE (decl
);
6558 const char *keyword
;
6560 switch (TREE_CODE (decl
))
6565 gcc_assert (I_SYMBOL_BINDING (b
->id
) == b
);
6566 I_SYMBOL_BINDING (b
->id
) = b
->shadowed
;
6569 /* Check for forward decls that never got their actual decl. */
6570 if (TREE_ASM_WRITTEN (decl
))
6571 error ("parameter %q+D has just a forward declaration", decl
);
6572 /* Check for (..., void, ...) and issue an error. */
6573 else if (VOID_TYPE_P (type
) && !DECL_NAME (decl
))
6575 if (!gave_void_only_once_err
)
6577 error ("%<void%> must be the only parameter");
6578 gave_void_only_once_err
= true;
6583 /* Valid parameter, add it to the list. */
6584 DECL_CHAIN (decl
) = parms
;
6587 /* Since there is a prototype, args are passed in their
6588 declared types. The back end may override this later. */
6589 DECL_ARG_TYPE (decl
) = type
;
6590 types
= tree_cons (0, type
, types
);
6594 case ENUMERAL_TYPE
: keyword
= "enum"; goto tag
;
6595 case UNION_TYPE
: keyword
= "union"; goto tag
;
6596 case RECORD_TYPE
: keyword
= "struct"; goto tag
;
6598 /* Types may not have tag-names, in which case the type
6599 appears in the bindings list with b->id NULL. */
6602 gcc_assert (I_TAG_BINDING (b
->id
) == b
);
6603 I_TAG_BINDING (b
->id
) = b
->shadowed
;
6606 /* Warn about any struct, union or enum tags defined in a
6607 parameter list. The scope of such types is limited to
6608 the parameter list, which is rarely if ever desirable
6609 (it's impossible to call such a function with type-
6610 correct arguments). An anonymous union parm type is
6611 meaningful as a GNU extension, so don't warn for that. */
6612 if (TREE_CODE (decl
) != UNION_TYPE
|| b
->id
!= 0)
6615 /* The %s will be one of 'struct', 'union', or 'enum'. */
6616 warning (0, "%<%s %E%> declared inside parameter list",
6619 /* The %s will be one of 'struct', 'union', or 'enum'. */
6620 warning (0, "anonymous %s declared inside parameter list",
6623 if (!explained_incomplete_types
)
6625 warning (0, "its scope is only this definition or declaration,"
6626 " which is probably not what you want");
6627 explained_incomplete_types
= true;
6633 vec_safe_push (tags
, tag
);
6639 /* CONST_DECLs appear here when we have an embedded enum,
6640 and TYPE_DECLs appear here when we have an embedded struct
6641 or union. No warnings for this - we already warned about the
6642 type itself. FUNCTION_DECLs appear when there is an implicit
6643 function declaration in the parameter list. */
6645 /* When we reinsert this decl in the function body, we need
6646 to reconstruct whether it was marked as nested. */
6647 gcc_assert (TREE_CODE (decl
) == FUNCTION_DECL
6650 DECL_CHAIN (decl
) = others
;
6655 /* error_mark_node appears here when we have an undeclared
6656 variable. Just throw it away. */
6659 gcc_assert (I_SYMBOL_BINDING (b
->id
) == b
);
6660 I_SYMBOL_BINDING (b
->id
) = b
->shadowed
;
6664 /* Other things that might be encountered. */
6671 b
= free_binding_and_advance (b
);
6674 arg_info
->parms
= parms
;
6675 arg_info
->tags
= tags
;
6676 arg_info
->types
= types
;
6677 arg_info
->others
= others
;
6678 arg_info
->pending_sizes
= expr
;
6682 /* Get the struct, enum or union (CODE says which) with tag NAME.
6683 Define the tag as a forward-reference with location LOC if it is
6684 not defined. Return a c_typespec structure for the type
6688 parser_xref_tag (location_t loc
, enum tree_code code
, tree name
)
6690 struct c_typespec ret
;
6694 ret
.expr
= NULL_TREE
;
6695 ret
.expr_const_operands
= true;
6697 /* If a cross reference is requested, look up the type
6698 already defined for this tag and return it. */
6700 ref
= lookup_tag (code
, name
, 0, &refloc
);
6701 /* If this is the right type of tag, return what we found.
6702 (This reference will be shadowed by shadow_tag later if appropriate.)
6703 If this is the wrong type of tag, do not return it. If it was the
6704 wrong type in the same scope, we will have had an error
6705 message already; if in a different scope and declaring
6706 a name, pending_xref_error will give an error message; but if in a
6707 different scope and not declaring a name, this tag should
6708 shadow the previous declaration of a different type of tag, and
6709 this would not work properly if we return the reference found.
6710 (For example, with "struct foo" in an outer scope, "union foo;"
6711 must shadow that tag with a new one of union type.) */
6712 ret
.kind
= (ref
? ctsk_tagref
: ctsk_tagfirstref
);
6713 if (ref
&& TREE_CODE (ref
) == code
)
6715 if (C_TYPE_DEFINED_IN_STRUCT (ref
)
6716 && loc
!= UNKNOWN_LOCATION
6722 warning_at (loc
, OPT_Wc___compat
,
6723 ("enum type defined in struct or union "
6724 "is not visible in C++"));
6725 inform (refloc
, "enum type defined here");
6728 warning_at (loc
, OPT_Wc___compat
,
6729 ("struct defined in struct or union "
6730 "is not visible in C++"));
6731 inform (refloc
, "struct defined here");
6734 warning_at (loc
, OPT_Wc___compat
,
6735 ("union defined in struct or union "
6736 "is not visible in C++"));
6737 inform (refloc
, "union defined here");
6748 /* If no such tag is yet defined, create a forward-reference node
6749 and record it as the "definition".
6750 When a real declaration of this type is found,
6751 the forward-reference will be altered into a real type. */
6753 ref
= make_node (code
);
6754 if (code
== ENUMERAL_TYPE
)
6756 /* Give the type a default layout like unsigned int
6757 to avoid crashing if it does not get defined. */
6758 SET_TYPE_MODE (ref
, TYPE_MODE (unsigned_type_node
));
6759 TYPE_ALIGN (ref
) = TYPE_ALIGN (unsigned_type_node
);
6760 TYPE_USER_ALIGN (ref
) = 0;
6761 TYPE_UNSIGNED (ref
) = 1;
6762 TYPE_PRECISION (ref
) = TYPE_PRECISION (unsigned_type_node
);
6763 TYPE_MIN_VALUE (ref
) = TYPE_MIN_VALUE (unsigned_type_node
);
6764 TYPE_MAX_VALUE (ref
) = TYPE_MAX_VALUE (unsigned_type_node
);
6767 pushtag (loc
, name
, ref
);
6773 /* Get the struct, enum or union (CODE says which) with tag NAME.
6774 Define the tag as a forward-reference if it is not defined.
6775 Return a tree for the type. */
6778 xref_tag (enum tree_code code
, tree name
)
6780 return parser_xref_tag (input_location
, code
, name
).spec
;
6783 /* Make sure that the tag NAME is defined *in the current scope*
6784 at least as a forward reference.
6785 LOC is the location of the struct's definition.
6786 CODE says which kind of tag NAME ought to be.
6788 This stores the current value of the file static STRUCT_PARSE_INFO
6789 in *ENCLOSING_STRUCT_PARSE_INFO, and points STRUCT_PARSE_INFO at a
6790 new c_struct_parse_info structure. The old value of
6791 STRUCT_PARSE_INFO is restored in finish_struct. */
6794 start_struct (location_t loc
, enum tree_code code
, tree name
,
6795 struct c_struct_parse_info
**enclosing_struct_parse_info
)
6797 /* If there is already a tag defined at this scope
6798 (as a forward reference), just return it. */
6800 tree ref
= NULL_TREE
;
6801 location_t refloc
= UNKNOWN_LOCATION
;
6803 if (name
!= NULL_TREE
)
6804 ref
= lookup_tag (code
, name
, 1, &refloc
);
6805 if (ref
&& TREE_CODE (ref
) == code
)
6807 if (TYPE_SIZE (ref
))
6809 if (code
== UNION_TYPE
)
6810 error_at (loc
, "redefinition of %<union %E%>", name
);
6812 error_at (loc
, "redefinition of %<struct %E%>", name
);
6813 if (refloc
!= UNKNOWN_LOCATION
)
6814 inform (refloc
, "originally defined here");
6815 /* Don't create structures using a name already in use. */
6818 else if (C_TYPE_BEING_DEFINED (ref
))
6820 if (code
== UNION_TYPE
)
6821 error_at (loc
, "nested redefinition of %<union %E%>", name
);
6823 error_at (loc
, "nested redefinition of %<struct %E%>", name
);
6824 /* Don't bother to report "originally defined here" for a
6825 nested redefinition; the original definition should be
6827 /* Don't create structures that contain themselves. */
6832 /* Otherwise create a forward-reference just so the tag is in scope. */
6834 if (ref
== NULL_TREE
|| TREE_CODE (ref
) != code
)
6836 ref
= make_node (code
);
6837 pushtag (loc
, name
, ref
);
6840 C_TYPE_BEING_DEFINED (ref
) = 1;
6841 TYPE_PACKED (ref
) = flag_pack_struct
;
6843 *enclosing_struct_parse_info
= struct_parse_info
;
6844 struct_parse_info
= XNEW (struct c_struct_parse_info
);
6845 struct_parse_info
->struct_types
.create (0);
6846 struct_parse_info
->fields
.create (0);
6847 struct_parse_info
->typedefs_seen
.create (0);
6849 /* FIXME: This will issue a warning for a use of a type defined
6850 within a statement expr used within sizeof, et. al. This is not
6851 terribly serious as C++ doesn't permit statement exprs within
6853 if (warn_cxx_compat
&& (in_sizeof
|| in_typeof
|| in_alignof
))
6854 warning_at (loc
, OPT_Wc___compat
,
6855 "defining type in %qs expression is invalid in C++",
6858 : (in_typeof
? "typeof" : "alignof")));
6863 /* Process the specs, declarator and width (NULL if omitted)
6864 of a structure component, returning a FIELD_DECL node.
6865 WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node.
6866 DECL_ATTRS is as for grokdeclarator.
6868 LOC is the location of the structure component.
6870 This is done during the parsing of the struct declaration.
6871 The FIELD_DECL nodes are chained together and the lot of them
6872 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
6875 grokfield (location_t loc
,
6876 struct c_declarator
*declarator
, struct c_declspecs
*declspecs
,
6877 tree width
, tree
*decl_attrs
)
6881 if (declarator
->kind
== cdk_id
&& declarator
->u
.id
== NULL_TREE
6882 && width
== NULL_TREE
)
6884 /* This is an unnamed decl.
6886 If we have something of the form "union { list } ;" then this
6887 is the anonymous union extension. Similarly for struct.
6889 If this is something of the form "struct foo;", then
6890 If MS or Plan 9 extensions are enabled, this is handled as
6891 an anonymous struct.
6892 Otherwise this is a forward declaration of a structure tag.
6894 If this is something of the form "foo;" and foo is a TYPE_DECL, then
6895 If foo names a structure or union without a tag, then this
6896 is an anonymous struct (this is permitted by C11).
6897 If MS or Plan 9 extensions are enabled and foo names a
6898 structure, then again this is an anonymous struct.
6899 Otherwise this is an error.
6901 Oh what a horrid tangled web we weave. I wonder if MS consciously
6902 took this from Plan 9 or if it was an accident of implementation
6903 that took root before someone noticed the bug... */
6905 tree type
= declspecs
->type
;
6906 bool type_ok
= (TREE_CODE (type
) == RECORD_TYPE
6907 || TREE_CODE (type
) == UNION_TYPE
);
6911 && (flag_ms_extensions
6912 || flag_plan9_extensions
6913 || !declspecs
->typedef_p
))
6915 if (flag_ms_extensions
|| flag_plan9_extensions
)
6917 else if (TYPE_NAME (type
) == NULL
)
6924 pedwarn (loc
, 0, "declaration does not declare anything");
6930 pedwarn (loc
, OPT_Wpedantic
,
6931 "ISO C99 doesn%'t support unnamed structs/unions");
6933 pedwarn (loc
, OPT_Wpedantic
,
6934 "ISO C90 doesn%'t support unnamed structs/unions");
6938 value
= grokdeclarator (declarator
, declspecs
, FIELD
, false,
6939 width
? &width
: NULL
, decl_attrs
, NULL
, NULL
,
6942 finish_decl (value
, loc
, NULL_TREE
, NULL_TREE
, NULL_TREE
);
6943 DECL_INITIAL (value
) = width
;
6945 if (warn_cxx_compat
&& DECL_NAME (value
) != NULL_TREE
)
6947 /* If we currently have a binding for this field, set the
6948 in_struct field in the binding, so that we warn about lookups
6950 struct c_binding
*b
= I_SYMBOL_BINDING (DECL_NAME (value
));
6953 /* If the in_struct field is not yet set, push it on a list
6954 to be cleared when this struct is finished. */
6957 struct_parse_info
->fields
.safe_push (b
);
6966 /* Subroutine of detect_field_duplicates: return whether X and Y,
6967 which are both fields in the same struct, have duplicate field
6971 is_duplicate_field (tree x
, tree y
)
6973 if (DECL_NAME (x
) != NULL_TREE
&& DECL_NAME (x
) == DECL_NAME (y
))
6976 /* When using -fplan9-extensions, an anonymous field whose name is a
6977 typedef can duplicate a field name. */
6978 if (flag_plan9_extensions
6979 && (DECL_NAME (x
) == NULL_TREE
|| DECL_NAME (y
) == NULL_TREE
))
6981 tree xt
, xn
, yt
, yn
;
6984 if (DECL_NAME (x
) != NULL_TREE
)
6986 else if ((TREE_CODE (xt
) == RECORD_TYPE
|| TREE_CODE (xt
) == UNION_TYPE
)
6987 && TYPE_NAME (xt
) != NULL_TREE
6988 && TREE_CODE (TYPE_NAME (xt
)) == TYPE_DECL
)
6989 xn
= DECL_NAME (TYPE_NAME (xt
));
6994 if (DECL_NAME (y
) != NULL_TREE
)
6996 else if ((TREE_CODE (yt
) == RECORD_TYPE
|| TREE_CODE (yt
) == UNION_TYPE
)
6997 && TYPE_NAME (yt
) != NULL_TREE
6998 && TREE_CODE (TYPE_NAME (yt
)) == TYPE_DECL
)
6999 yn
= DECL_NAME (TYPE_NAME (yt
));
7003 if (xn
!= NULL_TREE
&& xn
== yn
)
7010 /* Subroutine of detect_field_duplicates: add the fields of FIELDLIST
7011 to HTAB, giving errors for any duplicates. */
7014 detect_field_duplicates_hash (tree fieldlist
,
7015 hash_table
<pointer_hash
<tree_node
> > htab
)
7020 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
7021 if ((y
= DECL_NAME (x
)) != 0)
7023 slot
= htab
.find_slot (y
, INSERT
);
7026 error ("duplicate member %q+D", x
);
7027 DECL_NAME (x
) = NULL_TREE
;
7031 else if (TREE_CODE (TREE_TYPE (x
)) == RECORD_TYPE
7032 || TREE_CODE (TREE_TYPE (x
)) == UNION_TYPE
)
7034 detect_field_duplicates_hash (TYPE_FIELDS (TREE_TYPE (x
)), htab
);
7036 /* When using -fplan9-extensions, an anonymous field whose
7037 name is a typedef can duplicate a field name. */
7038 if (flag_plan9_extensions
7039 && TYPE_NAME (TREE_TYPE (x
)) != NULL_TREE
7040 && TREE_CODE (TYPE_NAME (TREE_TYPE (x
))) == TYPE_DECL
)
7042 tree xn
= DECL_NAME (TYPE_NAME (TREE_TYPE (x
)));
7043 slot
= htab
.find_slot (xn
, INSERT
);
7045 error ("duplicate member %q+D", TYPE_NAME (TREE_TYPE (x
)));
7051 /* Generate an error for any duplicate field names in FIELDLIST. Munge
7052 the list such that this does not present a problem later. */
7055 detect_field_duplicates (tree fieldlist
)
7060 /* If the struct is the list of instance variables of an Objective-C
7061 class, then we need to check all the instance variables of
7062 superclasses when checking for duplicates (since you can't have
7063 an instance variable in a subclass with the same name as an
7064 instance variable in a superclass). We pass on this job to the
7065 Objective-C compiler. objc_detect_field_duplicates() will return
7066 false if we are not checking the list of instance variables and
7067 the C frontend should proceed with the standard field duplicate
7068 checks. If we are checking the list of instance variables, the
7069 ObjC frontend will do the check, emit the errors if needed, and
7070 then return true. */
7071 if (c_dialect_objc ())
7072 if (objc_detect_field_duplicates (false))
7075 /* First, see if there are more than "a few" fields.
7076 This is trivially true if there are zero or one fields. */
7077 if (!fieldlist
|| !DECL_CHAIN (fieldlist
))
7082 if (DECL_NAME (x
) == NULL_TREE
7083 && (TREE_CODE (TREE_TYPE (x
)) == RECORD_TYPE
7084 || TREE_CODE (TREE_TYPE (x
)) == UNION_TYPE
))
7087 } while (timeout
> 0 && x
);
7089 /* If there were "few" fields and no anonymous structures or unions,
7090 avoid the overhead of allocating a hash table. Instead just do
7091 the nested traversal thing. */
7094 for (x
= DECL_CHAIN (fieldlist
); x
; x
= DECL_CHAIN (x
))
7095 /* When using -fplan9-extensions, we can have duplicates
7096 between typedef names and fields. */
7098 || (flag_plan9_extensions
7099 && DECL_NAME (x
) == NULL_TREE
7100 && (TREE_CODE (TREE_TYPE (x
)) == RECORD_TYPE
7101 || TREE_CODE (TREE_TYPE (x
)) == UNION_TYPE
)
7102 && TYPE_NAME (TREE_TYPE (x
)) != NULL_TREE
7103 && TREE_CODE (TYPE_NAME (TREE_TYPE (x
))) == TYPE_DECL
))
7105 for (y
= fieldlist
; y
!= x
; y
= TREE_CHAIN (y
))
7106 if (is_duplicate_field (y
, x
))
7108 error ("duplicate member %q+D", x
);
7109 DECL_NAME (x
) = NULL_TREE
;
7115 hash_table
<pointer_hash
<tree_node
> > htab
;
7118 detect_field_duplicates_hash (fieldlist
, htab
);
7123 /* Finish up struct info used by -Wc++-compat. */
7126 warn_cxx_compat_finish_struct (tree fieldlist
)
7130 struct c_binding
*b
;
7132 /* Set the C_TYPE_DEFINED_IN_STRUCT flag for each type defined in
7133 the current struct. We do this now at the end of the struct
7134 because the flag is used to issue visibility warnings, and we
7135 only want to issue those warnings if the type is referenced
7136 outside of the struct declaration. */
7137 FOR_EACH_VEC_ELT (struct_parse_info
->struct_types
, ix
, x
)
7138 C_TYPE_DEFINED_IN_STRUCT (x
) = 1;
7140 /* The TYPEDEFS_SEEN field of STRUCT_PARSE_INFO is a list of
7141 typedefs used when declaring fields in this struct. If the name
7142 of any of the fields is also a typedef name then the struct would
7143 not parse in C++, because the C++ lookup rules say that the
7144 typedef name would be looked up in the context of the struct, and
7145 would thus be the field rather than the typedef. */
7146 if (!struct_parse_info
->typedefs_seen
.is_empty ()
7147 && fieldlist
!= NULL_TREE
)
7149 /* Use a pointer_set using the name of the typedef. We can use
7150 a pointer_set because identifiers are interned. */
7151 struct pointer_set_t
*tset
= pointer_set_create ();
7153 FOR_EACH_VEC_ELT (struct_parse_info
->typedefs_seen
, ix
, x
)
7154 pointer_set_insert (tset
, DECL_NAME (x
));
7156 for (x
= fieldlist
; x
!= NULL_TREE
; x
= DECL_CHAIN (x
))
7158 if (DECL_NAME (x
) != NULL_TREE
7159 && pointer_set_contains (tset
, DECL_NAME (x
)))
7161 warning_at (DECL_SOURCE_LOCATION (x
), OPT_Wc___compat
,
7162 ("using %qD as both field and typedef name is "
7165 /* FIXME: It would be nice to report the location where
7166 the typedef name is used. */
7170 pointer_set_destroy (tset
);
7173 /* For each field which has a binding and which was not defined in
7174 an enclosing struct, clear the in_struct field. */
7175 FOR_EACH_VEC_ELT (struct_parse_info
->fields
, ix
, b
)
7179 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
7180 LOC is the location of the RECORD_TYPE or UNION_TYPE's definition.
7181 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
7182 ATTRIBUTES are attributes to be applied to the structure.
7184 ENCLOSING_STRUCT_PARSE_INFO is the value of STRUCT_PARSE_INFO when
7185 the struct was started. */
7188 finish_struct (location_t loc
, tree t
, tree fieldlist
, tree attributes
,
7189 struct c_struct_parse_info
*enclosing_struct_parse_info
)
7192 bool toplevel
= file_scope
== current_scope
;
7193 int saw_named_field
;
7195 /* If this type was previously laid out as a forward reference,
7196 make sure we lay it out again. */
7200 decl_attributes (&t
, attributes
, (int) ATTR_FLAG_TYPE_IN_PLACE
);
7204 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
7206 if (DECL_NAME (x
) != 0)
7209 && (TREE_CODE (TREE_TYPE (x
)) == RECORD_TYPE
7210 || TREE_CODE (TREE_TYPE (x
)) == UNION_TYPE
))
7216 if (TREE_CODE (t
) == UNION_TYPE
)
7219 pedwarn (loc
, OPT_Wpedantic
, "union has no named members");
7221 pedwarn (loc
, OPT_Wpedantic
, "union has no members");
7226 pedwarn (loc
, OPT_Wpedantic
, "struct has no named members");
7228 pedwarn (loc
, OPT_Wpedantic
, "struct has no members");
7233 /* Install struct as DECL_CONTEXT of each field decl.
7234 Also process specified field sizes, found in the DECL_INITIAL,
7235 storing 0 there after the type has been changed to precision equal
7236 to its width, rather than the precision of the specified standard
7237 type. (Correct layout requires the original type to have been preserved
7240 saw_named_field
= 0;
7241 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
7243 if (TREE_TYPE (x
) == error_mark_node
)
7246 DECL_CONTEXT (x
) = t
;
7248 /* If any field is const, the structure type is pseudo-const. */
7249 if (TREE_READONLY (x
))
7250 C_TYPE_FIELDS_READONLY (t
) = 1;
7253 /* A field that is pseudo-const makes the structure likewise. */
7254 tree t1
= strip_array_types (TREE_TYPE (x
));
7255 if ((TREE_CODE (t1
) == RECORD_TYPE
|| TREE_CODE (t1
) == UNION_TYPE
)
7256 && C_TYPE_FIELDS_READONLY (t1
))
7257 C_TYPE_FIELDS_READONLY (t
) = 1;
7260 /* Any field that is volatile means variables of this type must be
7261 treated in some ways as volatile. */
7262 if (TREE_THIS_VOLATILE (x
))
7263 C_TYPE_FIELDS_VOLATILE (t
) = 1;
7265 /* Any field of nominal variable size implies structure is too. */
7266 if (C_DECL_VARIABLE_SIZE (x
))
7267 C_TYPE_VARIABLE_SIZE (t
) = 1;
7269 if (DECL_INITIAL (x
))
7271 unsigned HOST_WIDE_INT width
= tree_to_uhwi (DECL_INITIAL (x
));
7272 DECL_SIZE (x
) = bitsize_int (width
);
7273 DECL_BIT_FIELD (x
) = 1;
7274 SET_DECL_C_BIT_FIELD (x
);
7278 && (DECL_BIT_FIELD (x
)
7279 || TYPE_ALIGN (TREE_TYPE (x
)) > BITS_PER_UNIT
))
7280 DECL_PACKED (x
) = 1;
7282 /* Detect flexible array member in an invalid context. */
7283 if (TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
7284 && TYPE_SIZE (TREE_TYPE (x
)) == NULL_TREE
7285 && TYPE_DOMAIN (TREE_TYPE (x
)) != NULL_TREE
7286 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x
))) == NULL_TREE
)
7288 if (TREE_CODE (t
) == UNION_TYPE
)
7290 error_at (DECL_SOURCE_LOCATION (x
),
7291 "flexible array member in union");
7292 TREE_TYPE (x
) = error_mark_node
;
7294 else if (DECL_CHAIN (x
) != NULL_TREE
)
7296 error_at (DECL_SOURCE_LOCATION (x
),
7297 "flexible array member not at end of struct");
7298 TREE_TYPE (x
) = error_mark_node
;
7300 else if (!saw_named_field
)
7302 error_at (DECL_SOURCE_LOCATION (x
),
7303 "flexible array member in otherwise empty struct");
7304 TREE_TYPE (x
) = error_mark_node
;
7308 if (pedantic
&& TREE_CODE (t
) == RECORD_TYPE
7309 && flexible_array_type_p (TREE_TYPE (x
)))
7310 pedwarn (DECL_SOURCE_LOCATION (x
), OPT_Wpedantic
,
7311 "invalid use of structure with flexible array member");
7314 || TREE_CODE (TREE_TYPE (x
)) == RECORD_TYPE
7315 || TREE_CODE (TREE_TYPE (x
)) == UNION_TYPE
)
7316 saw_named_field
= 1;
7319 detect_field_duplicates (fieldlist
);
7321 /* Now we have the nearly final fieldlist. Record it,
7322 then lay out the structure or union (including the fields). */
7324 TYPE_FIELDS (t
) = fieldlist
;
7328 if (TYPE_SIZE_UNIT (t
)
7329 && TREE_CODE (TYPE_SIZE_UNIT (t
)) == INTEGER_CST
7330 && !TREE_OVERFLOW (TYPE_SIZE_UNIT (t
))
7331 && !valid_constant_size_p (TYPE_SIZE_UNIT (t
)))
7332 error ("type %qT is too large", t
);
7334 /* Give bit-fields their proper types. */
7336 tree
*fieldlistp
= &fieldlist
;
7338 if (TREE_CODE (*fieldlistp
) == FIELD_DECL
&& DECL_INITIAL (*fieldlistp
)
7339 && TREE_TYPE (*fieldlistp
) != error_mark_node
)
7341 unsigned HOST_WIDE_INT width
7342 = tree_to_uhwi (DECL_INITIAL (*fieldlistp
));
7343 tree type
= TREE_TYPE (*fieldlistp
);
7344 if (width
!= TYPE_PRECISION (type
))
7346 TREE_TYPE (*fieldlistp
)
7347 = c_build_bitfield_integer_type (width
, TYPE_UNSIGNED (type
));
7348 DECL_MODE (*fieldlistp
) = TYPE_MODE (TREE_TYPE (*fieldlistp
));
7350 DECL_INITIAL (*fieldlistp
) = 0;
7353 fieldlistp
= &DECL_CHAIN (*fieldlistp
);
7356 /* Now we have the truly final field list.
7357 Store it in this type and in the variants. */
7359 TYPE_FIELDS (t
) = fieldlist
;
7361 /* If there are lots of fields, sort so we can look through them fast.
7362 We arbitrarily consider 16 or more elts to be "a lot". */
7367 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
7369 if (len
> 15 || DECL_NAME (x
) == NULL
)
7377 struct lang_type
*space
;
7378 struct sorted_fields_type
*space2
;
7380 len
+= list_length (x
);
7382 /* Use the same allocation policy here that make_node uses, to
7383 ensure that this lives as long as the rest of the struct decl.
7384 All decls in an inline function need to be saved. */
7386 space
= ggc_alloc_cleared_lang_type (sizeof (struct lang_type
));
7387 space2
= ggc_alloc_sorted_fields_type
7388 (sizeof (struct sorted_fields_type
) + len
* sizeof (tree
));
7392 field_array
= &space2
->elts
[0];
7393 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
7395 field_array
[len
++] = x
;
7397 /* If there is anonymous struct or union, break out of the loop. */
7398 if (DECL_NAME (x
) == NULL
)
7401 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
7404 TYPE_LANG_SPECIFIC (t
) = space
;
7405 TYPE_LANG_SPECIFIC (t
)->s
->len
= len
;
7406 field_array
= TYPE_LANG_SPECIFIC (t
)->s
->elts
;
7407 qsort (field_array
, len
, sizeof (tree
), field_decl_cmp
);
7412 for (x
= TYPE_MAIN_VARIANT (t
); x
; x
= TYPE_NEXT_VARIANT (x
))
7414 TYPE_FIELDS (x
) = TYPE_FIELDS (t
);
7415 TYPE_LANG_SPECIFIC (x
) = TYPE_LANG_SPECIFIC (t
);
7416 C_TYPE_FIELDS_READONLY (x
) = C_TYPE_FIELDS_READONLY (t
);
7417 C_TYPE_FIELDS_VOLATILE (x
) = C_TYPE_FIELDS_VOLATILE (t
);
7418 C_TYPE_VARIABLE_SIZE (x
) = C_TYPE_VARIABLE_SIZE (t
);
7421 /* If this was supposed to be a transparent union, but we can't
7422 make it one, warn and turn off the flag. */
7423 if (TREE_CODE (t
) == UNION_TYPE
7424 && TYPE_TRANSPARENT_AGGR (t
)
7425 && (!TYPE_FIELDS (t
) || TYPE_MODE (t
) != DECL_MODE (TYPE_FIELDS (t
))))
7427 TYPE_TRANSPARENT_AGGR (t
) = 0;
7428 warning_at (loc
, 0, "union cannot be made transparent");
7431 /* If this structure or union completes the type of any previous
7432 variable declaration, lay it out and output its rtl. */
7433 for (x
= C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t
));
7437 tree decl
= TREE_VALUE (x
);
7438 if (TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
)
7439 layout_array_type (TREE_TYPE (decl
));
7440 if (TREE_CODE (decl
) != TYPE_DECL
)
7442 layout_decl (decl
, 0);
7443 if (c_dialect_objc ())
7444 objc_check_decl (decl
);
7445 rest_of_decl_compilation (decl
, toplevel
, 0);
7448 C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t
)) = 0;
7450 /* Update type location to the one of the definition, instead of e.g.
7451 a forward declaration. */
7452 if (TYPE_STUB_DECL (t
))
7453 DECL_SOURCE_LOCATION (TYPE_STUB_DECL (t
)) = loc
;
7455 /* Finish debugging output for this type. */
7456 rest_of_type_compilation (t
, toplevel
);
7458 /* If we're inside a function proper, i.e. not file-scope and not still
7459 parsing parameters, then arrange for the size of a variable sized type
7461 if (building_stmt_list_p () && variably_modified_type_p (t
, NULL_TREE
))
7462 add_stmt (build_stmt (loc
,
7463 DECL_EXPR
, build_decl (loc
, TYPE_DECL
, NULL
, t
)));
7465 if (warn_cxx_compat
)
7466 warn_cxx_compat_finish_struct (fieldlist
);
7468 struct_parse_info
->struct_types
.release ();
7469 struct_parse_info
->fields
.release ();
7470 struct_parse_info
->typedefs_seen
.release ();
7471 XDELETE (struct_parse_info
);
7473 struct_parse_info
= enclosing_struct_parse_info
;
7475 /* If this struct is defined inside a struct, add it to
7478 && struct_parse_info
!= NULL
7479 && !in_sizeof
&& !in_typeof
&& !in_alignof
)
7480 struct_parse_info
->struct_types
.safe_push (t
);
7485 /* Lay out the type T, and its element type, and so on. */
7488 layout_array_type (tree t
)
7490 if (TREE_CODE (TREE_TYPE (t
)) == ARRAY_TYPE
)
7491 layout_array_type (TREE_TYPE (t
));
7495 /* Begin compiling the definition of an enumeration type.
7496 NAME is its name (or null if anonymous).
7497 LOC is the enum's location.
7498 Returns the type object, as yet incomplete.
7499 Also records info about it so that build_enumerator
7500 may be used to declare the individual values as they are read. */
7503 start_enum (location_t loc
, struct c_enum_contents
*the_enum
, tree name
)
7505 tree enumtype
= NULL_TREE
;
7506 location_t enumloc
= UNKNOWN_LOCATION
;
7508 /* If this is the real definition for a previous forward reference,
7509 fill in the contents in the same object that used to be the
7510 forward reference. */
7512 if (name
!= NULL_TREE
)
7513 enumtype
= lookup_tag (ENUMERAL_TYPE
, name
, 1, &enumloc
);
7515 if (enumtype
== 0 || TREE_CODE (enumtype
) != ENUMERAL_TYPE
)
7517 enumtype
= make_node (ENUMERAL_TYPE
);
7518 pushtag (loc
, name
, enumtype
);
7521 if (C_TYPE_BEING_DEFINED (enumtype
))
7522 error_at (loc
, "nested redefinition of %<enum %E%>", name
);
7524 C_TYPE_BEING_DEFINED (enumtype
) = 1;
7526 if (TYPE_VALUES (enumtype
) != 0)
7528 /* This enum is a named one that has been declared already. */
7529 error_at (loc
, "redeclaration of %<enum %E%>", name
);
7530 if (enumloc
!= UNKNOWN_LOCATION
)
7531 inform (enumloc
, "originally defined here");
7533 /* Completely replace its old definition.
7534 The old enumerators remain defined, however. */
7535 TYPE_VALUES (enumtype
) = 0;
7538 the_enum
->enum_next_value
= integer_zero_node
;
7539 the_enum
->enum_overflow
= 0;
7541 if (flag_short_enums
)
7542 TYPE_PACKED (enumtype
) = 1;
7544 /* FIXME: This will issue a warning for a use of a type defined
7545 within sizeof in a statement expr. This is not terribly serious
7546 as C++ doesn't permit statement exprs within sizeof anyhow. */
7547 if (warn_cxx_compat
&& (in_sizeof
|| in_typeof
|| in_alignof
))
7548 warning_at (loc
, OPT_Wc___compat
,
7549 "defining type in %qs expression is invalid in C++",
7552 : (in_typeof
? "typeof" : "alignof")));
7557 /* After processing and defining all the values of an enumeration type,
7558 install their decls in the enumeration type and finish it off.
7559 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
7560 and ATTRIBUTES are the specified attributes.
7561 Returns ENUMTYPE. */
7564 finish_enum (tree enumtype
, tree values
, tree attributes
)
7567 tree minnode
= 0, maxnode
= 0;
7570 bool toplevel
= (file_scope
== current_scope
);
7571 struct lang_type
*lt
;
7573 decl_attributes (&enumtype
, attributes
, (int) ATTR_FLAG_TYPE_IN_PLACE
);
7575 /* Calculate the maximum value of any enumerator in this type. */
7577 if (values
== error_mark_node
)
7578 minnode
= maxnode
= integer_zero_node
;
7581 minnode
= maxnode
= TREE_VALUE (values
);
7582 for (pair
= TREE_CHAIN (values
); pair
; pair
= TREE_CHAIN (pair
))
7584 tree value
= TREE_VALUE (pair
);
7585 if (tree_int_cst_lt (maxnode
, value
))
7587 if (tree_int_cst_lt (value
, minnode
))
7592 /* Construct the final type of this enumeration. It is the same
7593 as one of the integral types - the narrowest one that fits, except
7594 that normally we only go as narrow as int - and signed iff any of
7595 the values are negative. */
7596 sign
= (tree_int_cst_sgn (minnode
) >= 0) ? UNSIGNED
: SIGNED
;
7597 precision
= MAX (tree_int_cst_min_precision (minnode
, sign
),
7598 tree_int_cst_min_precision (maxnode
, sign
));
7600 if (TYPE_PACKED (enumtype
) || precision
> TYPE_PRECISION (integer_type_node
))
7602 tem
= c_common_type_for_size (precision
, sign
== UNSIGNED
? 1 : 0);
7605 warning (0, "enumeration values exceed range of largest integer");
7606 tem
= long_long_integer_type_node
;
7610 tem
= sign
== UNSIGNED
? unsigned_type_node
: integer_type_node
;
7612 TYPE_MIN_VALUE (enumtype
) = TYPE_MIN_VALUE (tem
);
7613 TYPE_MAX_VALUE (enumtype
) = TYPE_MAX_VALUE (tem
);
7614 TYPE_UNSIGNED (enumtype
) = TYPE_UNSIGNED (tem
);
7615 TYPE_SIZE (enumtype
) = 0;
7617 /* If the precision of the type was specific with an attribute and it
7618 was too small, give an error. Otherwise, use it. */
7619 if (TYPE_PRECISION (enumtype
))
7621 if (precision
> TYPE_PRECISION (enumtype
))
7622 error ("specified mode too small for enumeral values");
7625 TYPE_PRECISION (enumtype
) = TYPE_PRECISION (tem
);
7627 layout_type (enumtype
);
7629 if (values
!= error_mark_node
)
7631 /* Change the type of the enumerators to be the enum type. We
7632 need to do this irrespective of the size of the enum, for
7633 proper type checking. Replace the DECL_INITIALs of the
7634 enumerators, and the value slots of the list, with copies
7635 that have the enum type; they cannot be modified in place
7636 because they may be shared (e.g. integer_zero_node) Finally,
7637 change the purpose slots to point to the names of the decls. */
7638 for (pair
= values
; pair
; pair
= TREE_CHAIN (pair
))
7640 tree enu
= TREE_PURPOSE (pair
);
7641 tree ini
= DECL_INITIAL (enu
);
7643 TREE_TYPE (enu
) = enumtype
;
7645 /* The ISO C Standard mandates enumerators to have type int,
7646 even though the underlying type of an enum type is
7647 unspecified. However, GCC allows enumerators of any
7648 integer type as an extensions. build_enumerator()
7649 converts any enumerators that fit in an int to type int,
7650 to avoid promotions to unsigned types when comparing
7651 integers with enumerators that fit in the int range.
7652 When -pedantic is given, build_enumerator() would have
7653 already warned about those that don't fit. Here we
7654 convert the rest to the enumerator type. */
7655 if (TREE_TYPE (ini
) != integer_type_node
)
7656 ini
= convert (enumtype
, ini
);
7658 DECL_INITIAL (enu
) = ini
;
7659 TREE_PURPOSE (pair
) = DECL_NAME (enu
);
7660 TREE_VALUE (pair
) = ini
;
7663 TYPE_VALUES (enumtype
) = values
;
7666 /* Record the min/max values so that we can warn about bit-field
7667 enumerations that are too small for the values. */
7668 lt
= ggc_alloc_cleared_lang_type (sizeof (struct lang_type
));
7669 lt
->enum_min
= minnode
;
7670 lt
->enum_max
= maxnode
;
7671 TYPE_LANG_SPECIFIC (enumtype
) = lt
;
7673 /* Fix up all variant types of this enum type. */
7674 for (tem
= TYPE_MAIN_VARIANT (enumtype
); tem
; tem
= TYPE_NEXT_VARIANT (tem
))
7676 if (tem
== enumtype
)
7678 TYPE_VALUES (tem
) = TYPE_VALUES (enumtype
);
7679 TYPE_MIN_VALUE (tem
) = TYPE_MIN_VALUE (enumtype
);
7680 TYPE_MAX_VALUE (tem
) = TYPE_MAX_VALUE (enumtype
);
7681 TYPE_SIZE (tem
) = TYPE_SIZE (enumtype
);
7682 TYPE_SIZE_UNIT (tem
) = TYPE_SIZE_UNIT (enumtype
);
7683 SET_TYPE_MODE (tem
, TYPE_MODE (enumtype
));
7684 TYPE_PRECISION (tem
) = TYPE_PRECISION (enumtype
);
7685 TYPE_ALIGN (tem
) = TYPE_ALIGN (enumtype
);
7686 TYPE_USER_ALIGN (tem
) = TYPE_USER_ALIGN (enumtype
);
7687 TYPE_UNSIGNED (tem
) = TYPE_UNSIGNED (enumtype
);
7688 TYPE_LANG_SPECIFIC (tem
) = TYPE_LANG_SPECIFIC (enumtype
);
7691 /* Finish debugging output for this type. */
7692 rest_of_type_compilation (enumtype
, toplevel
);
7694 /* If this enum is defined inside a struct, add it to
7697 && struct_parse_info
!= NULL
7698 && !in_sizeof
&& !in_typeof
&& !in_alignof
)
7699 struct_parse_info
->struct_types
.safe_push (enumtype
);
7704 /* Build and install a CONST_DECL for one value of the
7705 current enumeration type (one that was begun with start_enum).
7706 DECL_LOC is the location of the enumerator.
7707 LOC is the location of the '=' operator if any, DECL_LOC otherwise.
7708 Return a tree-list containing the CONST_DECL and its value.
7709 Assignment of sequential values by default is handled here. */
7712 build_enumerator (location_t decl_loc
, location_t loc
,
7713 struct c_enum_contents
*the_enum
, tree name
, tree value
)
7717 /* Validate and default VALUE. */
7721 /* Don't issue more errors for error_mark_node (i.e. an
7722 undeclared identifier) - just ignore the value expression. */
7723 if (value
== error_mark_node
)
7725 else if (!INTEGRAL_TYPE_P (TREE_TYPE (value
)))
7727 error_at (loc
, "enumerator value for %qE is not an integer constant",
7733 if (TREE_CODE (value
) != INTEGER_CST
)
7735 value
= c_fully_fold (value
, false, NULL
);
7736 if (TREE_CODE (value
) == INTEGER_CST
)
7737 pedwarn (loc
, OPT_Wpedantic
,
7738 "enumerator value for %qE is not an integer "
7739 "constant expression", name
);
7741 if (TREE_CODE (value
) != INTEGER_CST
)
7743 error ("enumerator value for %qE is not an integer constant",
7749 value
= default_conversion (value
);
7750 constant_expression_warning (value
);
7755 /* Default based on previous value. */
7756 /* It should no longer be possible to have NON_LVALUE_EXPR
7760 value
= the_enum
->enum_next_value
;
7761 if (the_enum
->enum_overflow
)
7762 error_at (loc
, "overflow in enumeration values");
7764 /* Even though the underlying type of an enum is unspecified, the
7765 type of enumeration constants is explicitly defined as int
7766 (6.4.4.3/2 in the C99 Standard). GCC allows any integer type as
7768 else if (!int_fits_type_p (value
, integer_type_node
))
7769 pedwarn (loc
, OPT_Wpedantic
,
7770 "ISO C restricts enumerator values to range of %<int%>");
7772 /* The ISO C Standard mandates enumerators to have type int, even
7773 though the underlying type of an enum type is unspecified.
7774 However, GCC allows enumerators of any integer type as an
7775 extensions. Here we convert any enumerators that fit in an int
7776 to type int, to avoid promotions to unsigned types when comparing
7777 integers with enumerators that fit in the int range. When
7778 -pedantic is given, we would have already warned about those that
7779 don't fit. We have to do this here rather than in finish_enum
7780 because this value may be used to define more enumerators. */
7781 if (int_fits_type_p (value
, integer_type_node
))
7782 value
= convert (integer_type_node
, value
);
7784 /* Set basis for default for next value. */
7785 the_enum
->enum_next_value
7786 = build_binary_op (EXPR_LOC_OR_HERE (value
),
7787 PLUS_EXPR
, value
, integer_one_node
, 0);
7788 the_enum
->enum_overflow
= tree_int_cst_lt (the_enum
->enum_next_value
, value
);
7790 /* Now create a declaration for the enum value name. */
7792 type
= TREE_TYPE (value
);
7793 type
= c_common_type_for_size (MAX (TYPE_PRECISION (type
),
7794 TYPE_PRECISION (integer_type_node
)),
7795 (TYPE_PRECISION (type
)
7796 >= TYPE_PRECISION (integer_type_node
)
7797 && TYPE_UNSIGNED (type
)));
7799 decl
= build_decl (decl_loc
, CONST_DECL
, name
, type
);
7800 DECL_INITIAL (decl
) = convert (type
, value
);
7803 return tree_cons (decl
, value
, NULL_TREE
);
7807 /* Create the FUNCTION_DECL for a function definition.
7808 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
7809 the declaration; they describe the function's name and the type it returns,
7810 but twisted together in a fashion that parallels the syntax of C.
7812 This function creates a binding context for the function body
7813 as well as setting up the FUNCTION_DECL in current_function_decl.
7815 Returns 1 on success. If the DECLARATOR is not suitable for a function
7816 (it defines a datum instead), we return 0, which tells
7817 yyparse to report a parse error. */
7820 start_function (struct c_declspecs
*declspecs
, struct c_declarator
*declarator
,
7823 tree decl1
, old_decl
;
7824 tree restype
, resdecl
;
7827 current_function_returns_value
= 0; /* Assume, until we see it does. */
7828 current_function_returns_null
= 0;
7829 current_function_returns_abnormally
= 0;
7830 warn_about_return_type
= 0;
7831 c_switch_stack
= NULL
;
7833 /* Indicate no valid break/continue context by setting these variables
7834 to some non-null, non-label value. We'll notice and emit the proper
7835 error message in c_finish_bc_stmt. */
7836 c_break_label
= c_cont_label
= size_zero_node
;
7838 decl1
= grokdeclarator (declarator
, declspecs
, FUNCDEF
, true, NULL
,
7839 &attributes
, NULL
, NULL
, DEPRECATED_NORMAL
);
7841 /* If the declarator is not suitable for a function definition,
7842 cause a syntax error. */
7844 || TREE_CODE (decl1
) != FUNCTION_DECL
)
7847 loc
= DECL_SOURCE_LOCATION (decl1
);
7849 c_decl_attributes (&decl1
, attributes
, 0);
7851 if (DECL_DECLARED_INLINE_P (decl1
)
7852 && DECL_UNINLINABLE (decl1
)
7853 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1
)))
7854 warning_at (loc
, OPT_Wattributes
,
7855 "inline function %qD given attribute noinline",
7858 /* Handle gnu_inline attribute. */
7859 if (declspecs
->inline_p
7860 && !flag_gnu89_inline
7861 && TREE_CODE (decl1
) == FUNCTION_DECL
7862 && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl1
))
7863 || current_function_decl
))
7865 if (declspecs
->storage_class
!= csc_static
)
7866 DECL_EXTERNAL (decl1
) = !DECL_EXTERNAL (decl1
);
7869 announce_function (decl1
);
7871 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1
))))
7873 error_at (loc
, "return type is an incomplete type");
7874 /* Make it return void instead. */
7876 = build_function_type (void_type_node
,
7877 TYPE_ARG_TYPES (TREE_TYPE (decl1
)));
7880 if (warn_about_return_type
)
7881 pedwarn_c99 (loc
, flag_isoc99
? 0
7882 : (warn_return_type
? OPT_Wreturn_type
: OPT_Wimplicit_int
),
7883 "return type defaults to %<int%>");
7885 /* Make the init_value nonzero so pushdecl knows this is not tentative.
7886 error_mark_node is replaced below (in pop_scope) with the BLOCK. */
7887 DECL_INITIAL (decl1
) = error_mark_node
;
7889 /* A nested function is not global. */
7890 if (current_function_decl
!= 0)
7891 TREE_PUBLIC (decl1
) = 0;
7893 /* If this definition isn't a prototype and we had a prototype declaration
7894 before, copy the arg type info from that prototype. */
7895 old_decl
= lookup_name_in_scope (DECL_NAME (decl1
), current_scope
);
7896 if (old_decl
&& TREE_CODE (old_decl
) != FUNCTION_DECL
)
7898 current_function_prototype_locus
= UNKNOWN_LOCATION
;
7899 current_function_prototype_built_in
= false;
7900 current_function_prototype_arg_types
= NULL_TREE
;
7901 if (!prototype_p (TREE_TYPE (decl1
)))
7903 if (old_decl
!= 0 && TREE_CODE (TREE_TYPE (old_decl
)) == FUNCTION_TYPE
7904 && comptypes (TREE_TYPE (TREE_TYPE (decl1
)),
7905 TREE_TYPE (TREE_TYPE (old_decl
))))
7907 TREE_TYPE (decl1
) = composite_type (TREE_TYPE (old_decl
),
7909 current_function_prototype_locus
= DECL_SOURCE_LOCATION (old_decl
);
7910 current_function_prototype_built_in
7911 = C_DECL_BUILTIN_PROTOTYPE (old_decl
);
7912 current_function_prototype_arg_types
7913 = TYPE_ARG_TYPES (TREE_TYPE (decl1
));
7915 if (TREE_PUBLIC (decl1
))
7917 /* If there is an external prototype declaration of this
7918 function, record its location but do not copy information
7919 to this decl. This may be an invisible declaration
7920 (built-in or in a scope which has finished) or simply
7921 have more refined argument types than any declaration
7923 struct c_binding
*b
;
7924 for (b
= I_SYMBOL_BINDING (DECL_NAME (decl1
)); b
; b
= b
->shadowed
)
7925 if (B_IN_SCOPE (b
, external_scope
))
7929 tree ext_decl
, ext_type
;
7931 ext_type
= b
->u
.type
? b
->u
.type
: TREE_TYPE (ext_decl
);
7932 if (TREE_CODE (ext_type
) == FUNCTION_TYPE
7933 && comptypes (TREE_TYPE (TREE_TYPE (decl1
)),
7934 TREE_TYPE (ext_type
)))
7936 current_function_prototype_locus
7937 = DECL_SOURCE_LOCATION (ext_decl
);
7938 current_function_prototype_built_in
7939 = C_DECL_BUILTIN_PROTOTYPE (ext_decl
);
7940 current_function_prototype_arg_types
7941 = TYPE_ARG_TYPES (ext_type
);
7947 /* Optionally warn of old-fashioned def with no previous prototype. */
7948 if (warn_strict_prototypes
7949 && old_decl
!= error_mark_node
7950 && !prototype_p (TREE_TYPE (decl1
))
7951 && C_DECL_ISNT_PROTOTYPE (old_decl
))
7952 warning_at (loc
, OPT_Wstrict_prototypes
,
7953 "function declaration isn%'t a prototype");
7954 /* Optionally warn of any global def with no previous prototype. */
7955 else if (warn_missing_prototypes
7956 && old_decl
!= error_mark_node
7957 && TREE_PUBLIC (decl1
)
7958 && !MAIN_NAME_P (DECL_NAME (decl1
))
7959 && C_DECL_ISNT_PROTOTYPE (old_decl
))
7960 warning_at (loc
, OPT_Wmissing_prototypes
,
7961 "no previous prototype for %qD", decl1
);
7962 /* Optionally warn of any def with no previous prototype
7963 if the function has already been used. */
7964 else if (warn_missing_prototypes
7966 && old_decl
!= error_mark_node
7967 && TREE_USED (old_decl
)
7968 && !prototype_p (TREE_TYPE (old_decl
)))
7969 warning_at (loc
, OPT_Wmissing_prototypes
,
7970 "%qD was used with no prototype before its definition", decl1
);
7971 /* Optionally warn of any global def with no previous declaration. */
7972 else if (warn_missing_declarations
7973 && TREE_PUBLIC (decl1
)
7975 && !MAIN_NAME_P (DECL_NAME (decl1
)))
7976 warning_at (loc
, OPT_Wmissing_declarations
,
7977 "no previous declaration for %qD",
7979 /* Optionally warn of any def with no previous declaration
7980 if the function has already been used. */
7981 else if (warn_missing_declarations
7983 && old_decl
!= error_mark_node
7984 && TREE_USED (old_decl
)
7985 && C_DECL_IMPLICIT (old_decl
))
7986 warning_at (loc
, OPT_Wmissing_declarations
,
7987 "%qD was used with no declaration before its definition", decl1
);
7989 /* This function exists in static storage.
7990 (This does not mean `static' in the C sense!) */
7991 TREE_STATIC (decl1
) = 1;
7993 /* This is the earliest point at which we might know the assembler
7994 name of the function. Thus, if it's set before this, die horribly. */
7995 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl1
));
7997 /* If #pragma weak was used, mark the decl weak now. */
7998 if (current_scope
== file_scope
)
7999 maybe_apply_pragma_weak (decl1
);
8001 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
8002 if (warn_main
&& MAIN_NAME_P (DECL_NAME (decl1
)))
8004 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1
)))
8005 != integer_type_node
)
8006 pedwarn (loc
, OPT_Wmain
, "return type of %qD is not %<int%>", decl1
);
8008 check_main_parameter_types (decl1
);
8010 if (!TREE_PUBLIC (decl1
))
8011 pedwarn (loc
, OPT_Wmain
,
8012 "%qD is normally a non-static function", decl1
);
8015 /* Record the decl so that the function name is defined.
8016 If we already have a decl for this name, and it is a FUNCTION_DECL,
8017 use the old decl. */
8019 current_function_decl
= pushdecl (decl1
);
8022 declare_parm_level ();
8024 restype
= TREE_TYPE (TREE_TYPE (current_function_decl
));
8025 resdecl
= build_decl (loc
, RESULT_DECL
, NULL_TREE
, restype
);
8026 DECL_ARTIFICIAL (resdecl
) = 1;
8027 DECL_IGNORED_P (resdecl
) = 1;
8028 DECL_RESULT (current_function_decl
) = resdecl
;
8030 start_fname_decls ();
8035 /* Subroutine of store_parm_decls which handles new-style function
8036 definitions (prototype format). The parms already have decls, so we
8037 need only record them as in effect and complain if any redundant
8038 old-style parm decls were written. */
8040 store_parm_decls_newstyle (tree fndecl
, const struct c_arg_info
*arg_info
)
8046 if (current_scope
->bindings
)
8048 error_at (DECL_SOURCE_LOCATION (fndecl
),
8049 "old-style parameter declarations in prototyped "
8050 "function definition");
8052 /* Get rid of the old-style declarations. */
8056 /* Don't issue this warning for nested functions, and don't issue this
8057 warning if we got here because ARG_INFO_TYPES was error_mark_node
8058 (this happens when a function definition has just an ellipsis in
8059 its parameter list). */
8060 else if (!in_system_header
&& !current_function_scope
8061 && arg_info
->types
!= error_mark_node
)
8062 warning_at (DECL_SOURCE_LOCATION (fndecl
), OPT_Wtraditional
,
8063 "traditional C rejects ISO C style function definitions");
8065 /* Now make all the parameter declarations visible in the function body.
8066 We can bypass most of the grunt work of pushdecl. */
8067 for (decl
= arg_info
->parms
; decl
; decl
= DECL_CHAIN (decl
))
8069 DECL_CONTEXT (decl
) = current_function_decl
;
8070 if (DECL_NAME (decl
))
8072 bind (DECL_NAME (decl
), decl
, current_scope
,
8073 /*invisible=*/false, /*nested=*/false,
8075 if (!TREE_USED (decl
))
8076 warn_if_shadowing (decl
);
8079 error_at (DECL_SOURCE_LOCATION (decl
), "parameter name omitted");
8082 /* Record the parameter list in the function declaration. */
8083 DECL_ARGUMENTS (fndecl
) = arg_info
->parms
;
8085 /* Now make all the ancillary declarations visible, likewise. */
8086 for (decl
= arg_info
->others
; decl
; decl
= DECL_CHAIN (decl
))
8088 DECL_CONTEXT (decl
) = current_function_decl
;
8089 if (DECL_NAME (decl
))
8090 bind (DECL_NAME (decl
), decl
, current_scope
,
8091 /*invisible=*/false,
8092 /*nested=*/(TREE_CODE (decl
) == FUNCTION_DECL
),
8096 /* And all the tag declarations. */
8097 FOR_EACH_VEC_SAFE_ELT_REVERSE (arg_info
->tags
, ix
, tag
)
8099 bind (tag
->id
, tag
->type
, current_scope
,
8100 /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION
);
8103 /* Subroutine of store_parm_decls which handles old-style function
8104 definitions (separate parameter list and declarations). */
8107 store_parm_decls_oldstyle (tree fndecl
, const struct c_arg_info
*arg_info
)
8109 struct c_binding
*b
;
8110 tree parm
, decl
, last
;
8111 tree parmids
= arg_info
->parms
;
8112 struct pointer_set_t
*seen_args
= pointer_set_create ();
8114 if (!in_system_header
)
8115 warning_at (DECL_SOURCE_LOCATION (fndecl
),
8116 OPT_Wold_style_definition
, "old-style function definition");
8118 /* Match each formal parameter name with its declaration. Save each
8119 decl in the appropriate TREE_PURPOSE slot of the parmids chain. */
8120 for (parm
= parmids
; parm
; parm
= TREE_CHAIN (parm
))
8122 if (TREE_VALUE (parm
) == 0)
8124 error_at (DECL_SOURCE_LOCATION (fndecl
),
8125 "parameter name missing from parameter list");
8126 TREE_PURPOSE (parm
) = 0;
8130 b
= I_SYMBOL_BINDING (TREE_VALUE (parm
));
8131 if (b
&& B_IN_CURRENT_SCOPE (b
))
8134 /* Skip erroneous parameters. */
8135 if (decl
== error_mark_node
)
8137 /* If we got something other than a PARM_DECL it is an error. */
8138 if (TREE_CODE (decl
) != PARM_DECL
)
8139 error_at (DECL_SOURCE_LOCATION (decl
),
8140 "%qD declared as a non-parameter", decl
);
8141 /* If the declaration is already marked, we have a duplicate
8142 name. Complain and ignore the duplicate. */
8143 else if (pointer_set_contains (seen_args
, decl
))
8145 error_at (DECL_SOURCE_LOCATION (decl
),
8146 "multiple parameters named %qD", decl
);
8147 TREE_PURPOSE (parm
) = 0;
8150 /* If the declaration says "void", complain and turn it into
8152 else if (VOID_TYPE_P (TREE_TYPE (decl
)))
8154 error_at (DECL_SOURCE_LOCATION (decl
),
8155 "parameter %qD declared with void type", decl
);
8156 TREE_TYPE (decl
) = integer_type_node
;
8157 DECL_ARG_TYPE (decl
) = integer_type_node
;
8158 layout_decl (decl
, 0);
8160 warn_if_shadowing (decl
);
8162 /* If no declaration found, default to int. */
8165 /* FIXME diagnostics: This should be the location of the argument,
8166 not the FNDECL. E.g., for an old-style declaration
8168 int f10(v) { blah; }
8170 We should use the location of the V, not the F10.
8171 Unfortunately, the V is an IDENTIFIER_NODE which has no
8172 location. In the future we need locations for c_arg_info
8175 See gcc.dg/Wshadow-3.c for an example of this problem. */
8176 decl
= build_decl (DECL_SOURCE_LOCATION (fndecl
),
8177 PARM_DECL
, TREE_VALUE (parm
), integer_type_node
);
8178 DECL_ARG_TYPE (decl
) = TREE_TYPE (decl
);
8180 warn_if_shadowing (decl
);
8183 pedwarn (DECL_SOURCE_LOCATION (decl
),
8184 0, "type of %qD defaults to %<int%>", decl
);
8186 warning_at (DECL_SOURCE_LOCATION (decl
),
8187 OPT_Wmissing_parameter_type
,
8188 "type of %qD defaults to %<int%>", decl
);
8191 TREE_PURPOSE (parm
) = decl
;
8192 pointer_set_insert (seen_args
, decl
);
8195 /* Now examine the parms chain for incomplete declarations
8196 and declarations with no corresponding names. */
8198 for (b
= current_scope
->bindings
; b
; b
= b
->prev
)
8201 if (TREE_CODE (parm
) != PARM_DECL
)
8204 if (TREE_TYPE (parm
) != error_mark_node
8205 && !COMPLETE_TYPE_P (TREE_TYPE (parm
)))
8207 error_at (DECL_SOURCE_LOCATION (parm
),
8208 "parameter %qD has incomplete type", parm
);
8209 TREE_TYPE (parm
) = error_mark_node
;
8212 if (!pointer_set_contains (seen_args
, parm
))
8214 error_at (DECL_SOURCE_LOCATION (parm
),
8215 "declaration for parameter %qD but no such parameter",
8218 /* Pretend the parameter was not missing.
8219 This gets us to a standard state and minimizes
8220 further error messages. */
8221 parmids
= chainon (parmids
, tree_cons (parm
, 0, 0));
8225 /* Chain the declarations together in the order of the list of
8226 names. Store that chain in the function decl, replacing the
8227 list of names. Update the current scope to match. */
8228 DECL_ARGUMENTS (fndecl
) = 0;
8230 for (parm
= parmids
; parm
; parm
= TREE_CHAIN (parm
))
8231 if (TREE_PURPOSE (parm
))
8233 if (parm
&& TREE_PURPOSE (parm
))
8235 last
= TREE_PURPOSE (parm
);
8236 DECL_ARGUMENTS (fndecl
) = last
;
8238 for (parm
= TREE_CHAIN (parm
); parm
; parm
= TREE_CHAIN (parm
))
8239 if (TREE_PURPOSE (parm
))
8241 DECL_CHAIN (last
) = TREE_PURPOSE (parm
);
8242 last
= TREE_PURPOSE (parm
);
8244 DECL_CHAIN (last
) = 0;
8247 pointer_set_destroy (seen_args
);
8249 /* If there was a previous prototype,
8250 set the DECL_ARG_TYPE of each argument according to
8251 the type previously specified, and report any mismatches. */
8253 if (current_function_prototype_arg_types
)
8256 for (parm
= DECL_ARGUMENTS (fndecl
),
8257 type
= current_function_prototype_arg_types
;
8258 parm
|| (type
&& TREE_VALUE (type
) != error_mark_node
8259 && (TYPE_MAIN_VARIANT (TREE_VALUE (type
)) != void_type_node
));
8260 parm
= DECL_CHAIN (parm
), type
= TREE_CHAIN (type
))
8262 if (parm
== 0 || type
== 0
8263 || TYPE_MAIN_VARIANT (TREE_VALUE (type
)) == void_type_node
)
8265 if (current_function_prototype_built_in
)
8266 warning_at (DECL_SOURCE_LOCATION (fndecl
),
8267 0, "number of arguments doesn%'t match "
8268 "built-in prototype");
8271 /* FIXME diagnostics: This should be the location of
8272 FNDECL, but there is bug when a prototype is
8273 declared inside function context, but defined
8274 outside of it (e.g., gcc.dg/pr15698-2.c). In
8275 which case FNDECL gets the location of the
8276 prototype, not the definition. */
8277 error_at (input_location
,
8278 "number of arguments doesn%'t match prototype");
8280 error_at (current_function_prototype_locus
,
8281 "prototype declaration");
8285 /* Type for passing arg must be consistent with that
8286 declared for the arg. ISO C says we take the unqualified
8287 type for parameters declared with qualified type. */
8288 if (TREE_TYPE (parm
) != error_mark_node
8289 && TREE_TYPE (type
) != error_mark_node
8290 && ((TYPE_ATOMIC (DECL_ARG_TYPE (parm
))
8291 != TYPE_ATOMIC (TREE_VALUE (type
)))
8292 || !comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm
)),
8293 TYPE_MAIN_VARIANT (TREE_VALUE (type
)))))
8295 if ((TYPE_ATOMIC (DECL_ARG_TYPE (parm
))
8296 == TYPE_ATOMIC (TREE_VALUE (type
)))
8297 && (TYPE_MAIN_VARIANT (TREE_TYPE (parm
))
8298 == TYPE_MAIN_VARIANT (TREE_VALUE (type
))))
8300 /* Adjust argument to match prototype. E.g. a previous
8301 `int foo(float);' prototype causes
8302 `int foo(x) float x; {...}' to be treated like
8303 `int foo(float x) {...}'. This is particularly
8304 useful for argument types like uid_t. */
8305 DECL_ARG_TYPE (parm
) = TREE_TYPE (parm
);
8307 if (targetm
.calls
.promote_prototypes (TREE_TYPE (current_function_decl
))
8308 && INTEGRAL_TYPE_P (TREE_TYPE (parm
))
8309 && TYPE_PRECISION (TREE_TYPE (parm
))
8310 < TYPE_PRECISION (integer_type_node
))
8311 DECL_ARG_TYPE (parm
)
8312 = c_type_promotes_to (TREE_TYPE (parm
));
8314 /* ??? Is it possible to get here with a
8315 built-in prototype or will it always have
8316 been diagnosed as conflicting with an
8317 old-style definition and discarded? */
8318 if (current_function_prototype_built_in
)
8319 warning_at (DECL_SOURCE_LOCATION (parm
),
8320 OPT_Wpedantic
, "promoted argument %qD "
8321 "doesn%'t match built-in prototype", parm
);
8324 pedwarn (DECL_SOURCE_LOCATION (parm
),
8325 OPT_Wpedantic
, "promoted argument %qD "
8326 "doesn%'t match prototype", parm
);
8327 pedwarn (current_function_prototype_locus
, OPT_Wpedantic
,
8328 "prototype declaration");
8333 if (current_function_prototype_built_in
)
8334 warning_at (DECL_SOURCE_LOCATION (parm
),
8335 0, "argument %qD doesn%'t match "
8336 "built-in prototype", parm
);
8339 error_at (DECL_SOURCE_LOCATION (parm
),
8340 "argument %qD doesn%'t match prototype", parm
);
8341 error_at (current_function_prototype_locus
,
8342 "prototype declaration");
8347 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl
)) = 0;
8350 /* Otherwise, create a prototype that would match. */
8354 tree actual
= 0, last
= 0, type
;
8356 for (parm
= DECL_ARGUMENTS (fndecl
); parm
; parm
= DECL_CHAIN (parm
))
8358 type
= tree_cons (NULL_TREE
, DECL_ARG_TYPE (parm
), NULL_TREE
);
8360 TREE_CHAIN (last
) = type
;
8365 type
= tree_cons (NULL_TREE
, void_type_node
, NULL_TREE
);
8367 TREE_CHAIN (last
) = type
;
8371 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
8372 of the type of this function, but we need to avoid having this
8373 affect the types of other similarly-typed functions, so we must
8374 first force the generation of an identical (but separate) type
8375 node for the relevant function type. The new node we create
8376 will be a variant of the main variant of the original function
8379 TREE_TYPE (fndecl
) = build_variant_type_copy (TREE_TYPE (fndecl
));
8381 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl
)) = actual
;
8385 /* Store parameter declarations passed in ARG_INFO into the current
8386 function declaration. */
8389 store_parm_decls_from (struct c_arg_info
*arg_info
)
8391 current_function_arg_info
= arg_info
;
8392 store_parm_decls ();
8395 /* Store the parameter declarations into the current function declaration.
8396 This is called after parsing the parameter declarations, before
8397 digesting the body of the function.
8399 For an old-style definition, construct a prototype out of the old-style
8400 parameter declarations and inject it into the function's type. */
8403 store_parm_decls (void)
8405 tree fndecl
= current_function_decl
;
8408 /* The argument information block for FNDECL. */
8409 struct c_arg_info
*arg_info
= current_function_arg_info
;
8410 current_function_arg_info
= 0;
8412 /* True if this definition is written with a prototype. Note:
8413 despite C99 6.7.5.3p14, we can *not* treat an empty argument
8414 list in a function definition as equivalent to (void) -- an
8415 empty argument list specifies the function has no parameters,
8416 but only (void) sets up a prototype for future calls. */
8417 proto
= arg_info
->types
!= 0;
8420 store_parm_decls_newstyle (fndecl
, arg_info
);
8422 store_parm_decls_oldstyle (fndecl
, arg_info
);
8424 /* The next call to push_scope will be a function body. */
8426 next_is_function_body
= true;
8428 /* Write a record describing this function definition to the prototypes
8429 file (if requested). */
8431 gen_aux_info_record (fndecl
, 1, 0, proto
);
8433 /* Initialize the RTL code for the function. */
8434 allocate_struct_function (fndecl
, false);
8436 if (warn_unused_local_typedefs
)
8437 cfun
->language
= ggc_alloc_cleared_language_function ();
8439 /* Begin the statement tree for this function. */
8440 DECL_SAVED_TREE (fndecl
) = push_stmt_list ();
8442 /* ??? Insert the contents of the pending sizes list into the function
8443 to be evaluated. The only reason left to have this is
8444 void foo(int n, int array[n++])
8445 because we throw away the array type in favor of a pointer type, and
8446 thus won't naturally see the SAVE_EXPR containing the increment. All
8447 other pending sizes would be handled by gimplify_parameters. */
8448 if (arg_info
->pending_sizes
)
8449 add_stmt (arg_info
->pending_sizes
);
8452 /* Store PARM_DECLs in PARMS into scope temporarily. Used for
8453 c_finish_omp_declare_simd for function prototypes. No diagnostics
8457 temp_store_parm_decls (tree fndecl
, tree parms
)
8460 for (tree p
= parms
; p
; p
= DECL_CHAIN (p
))
8462 DECL_CONTEXT (p
) = fndecl
;
8464 bind (DECL_NAME (p
), p
, current_scope
,
8465 /*invisible=*/false, /*nested=*/false,
8470 /* Undo what temp_store_parm_decls did. */
8473 temp_pop_parm_decls (void)
8475 /* Clear all bindings in this temporary scope, so that
8476 pop_scope doesn't create a BLOCK. */
8477 struct c_binding
*b
= current_scope
->bindings
;
8478 current_scope
->bindings
= NULL
;
8479 for (; b
; b
= free_binding_and_advance (b
))
8481 gcc_assert (TREE_CODE (b
->decl
) == PARM_DECL
);
8482 gcc_assert (I_SYMBOL_BINDING (b
->id
) == b
);
8483 I_SYMBOL_BINDING (b
->id
) = b
->shadowed
;
8484 if (b
->shadowed
&& b
->shadowed
->u
.type
)
8485 TREE_TYPE (b
->shadowed
->decl
) = b
->shadowed
->u
.type
;
8491 /* Finish up a function declaration and compile that function
8492 all the way to assembler language output. Then free the storage
8493 for the function definition.
8495 This is called after parsing the body of the function definition. */
8498 finish_function (void)
8500 tree fndecl
= current_function_decl
;
8502 if (c_dialect_objc ())
8503 objc_finish_function ();
8505 if (TREE_CODE (fndecl
) == FUNCTION_DECL
8506 && targetm
.calls
.promote_prototypes (TREE_TYPE (fndecl
)))
8508 tree args
= DECL_ARGUMENTS (fndecl
);
8509 for (; args
; args
= DECL_CHAIN (args
))
8511 tree type
= TREE_TYPE (args
);
8512 if (INTEGRAL_TYPE_P (type
)
8513 && TYPE_PRECISION (type
) < TYPE_PRECISION (integer_type_node
))
8514 DECL_ARG_TYPE (args
) = c_type_promotes_to (type
);
8518 if (DECL_INITIAL (fndecl
) && DECL_INITIAL (fndecl
) != error_mark_node
)
8519 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl
)) = fndecl
;
8521 /* Must mark the RESULT_DECL as being in this function. */
8523 if (DECL_RESULT (fndecl
) && DECL_RESULT (fndecl
) != error_mark_node
)
8524 DECL_CONTEXT (DECL_RESULT (fndecl
)) = fndecl
;
8526 if (MAIN_NAME_P (DECL_NAME (fndecl
)) && flag_hosted
8527 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl
)))
8528 == integer_type_node
&& flag_isoc99
)
8530 /* Hack. We don't want the middle-end to warn that this return
8531 is unreachable, so we mark its location as special. Using
8532 UNKNOWN_LOCATION has the problem that it gets clobbered in
8533 annotate_one_with_locus. A cleaner solution might be to
8534 ensure ! should_carry_locus_p (stmt), but that needs a flag.
8536 c_finish_return (BUILTINS_LOCATION
, integer_zero_node
, NULL_TREE
);
8539 /* Tie off the statement tree for this function. */
8540 DECL_SAVED_TREE (fndecl
) = pop_stmt_list (DECL_SAVED_TREE (fndecl
));
8542 /* If the function has _Cilk_spawn in front of a function call inside it
8543 i.e. it is a spawning function, then add the appropriate Cilk plus
8544 functions inside. */
8545 if (fn_contains_cilk_spawn_p (cfun
))
8546 cfun
->cilk_frame_decl
= insert_cilk_frame (fndecl
);
8548 finish_fname_decls ();
8550 /* Complain if there's just no return statement. */
8551 if (warn_return_type
8552 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl
))) != VOID_TYPE
8553 && !current_function_returns_value
&& !current_function_returns_null
8554 /* Don't complain if we are no-return. */
8555 && !current_function_returns_abnormally
8556 /* Don't complain if we are declared noreturn. */
8557 && !TREE_THIS_VOLATILE (fndecl
)
8558 /* Don't warn for main(). */
8559 && !MAIN_NAME_P (DECL_NAME (fndecl
))
8560 /* Or if they didn't actually specify a return type. */
8561 && !C_FUNCTION_IMPLICIT_INT (fndecl
)
8562 /* Normally, with -Wreturn-type, flow will complain, but we might
8563 optimize out static functions. */
8564 && !TREE_PUBLIC (fndecl
))
8566 warning (OPT_Wreturn_type
,
8567 "no return statement in function returning non-void");
8568 TREE_NO_WARNING (fndecl
) = 1;
8571 /* Complain about parameters that are only set, but never otherwise used. */
8572 if (warn_unused_but_set_parameter
)
8576 for (decl
= DECL_ARGUMENTS (fndecl
);
8578 decl
= DECL_CHAIN (decl
))
8579 if (TREE_USED (decl
)
8580 && TREE_CODE (decl
) == PARM_DECL
8581 && !DECL_READ_P (decl
)
8583 && !DECL_ARTIFICIAL (decl
)
8584 && !TREE_NO_WARNING (decl
))
8585 warning_at (DECL_SOURCE_LOCATION (decl
),
8586 OPT_Wunused_but_set_parameter
,
8587 "parameter %qD set but not used", decl
);
8590 /* Complain about locally defined typedefs that are not used in this
8592 maybe_warn_unused_local_typedefs ();
8594 /* Store the end of the function, so that we get good line number
8595 info for the epilogue. */
8596 cfun
->function_end_locus
= input_location
;
8598 /* Finalize the ELF visibility for the function. */
8599 c_determine_visibility (fndecl
);
8601 /* For GNU C extern inline functions disregard inline limits. */
8602 if (DECL_EXTERNAL (fndecl
)
8603 && DECL_DECLARED_INLINE_P (fndecl
))
8604 DECL_DISREGARD_INLINE_LIMITS (fndecl
) = 1;
8606 /* Genericize before inlining. Delay genericizing nested functions
8607 until their parent function is genericized. Since finalizing
8608 requires GENERIC, delay that as well. */
8610 if (DECL_INITIAL (fndecl
) && DECL_INITIAL (fndecl
) != error_mark_node
8611 && !undef_nested_function
)
8613 if (!decl_function_context (fndecl
))
8615 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE
, fndecl
);
8616 c_genericize (fndecl
);
8618 /* ??? Objc emits functions after finalizing the compilation unit.
8619 This should be cleaned up later and this conditional removed. */
8620 if (cgraph_global_info_ready
)
8622 cgraph_add_new_function (fndecl
, false);
8625 cgraph_finalize_function (fndecl
, false);
8629 /* Register this function with cgraph just far enough to get it
8630 added to our parent's nested function list. Handy, since the
8631 C front end doesn't have such a list. */
8632 (void) cgraph_get_create_node (fndecl
);
8636 if (!decl_function_context (fndecl
))
8637 undef_nested_function
= false;
8639 if (cfun
->language
!= NULL
)
8641 ggc_free (cfun
->language
);
8642 cfun
->language
= NULL
;
8645 /* We're leaving the context of this function, so zap cfun.
8646 It's still in DECL_STRUCT_FUNCTION, and we'll restore it in
8647 tree_rest_of_compilation. */
8649 current_function_decl
= NULL
;
8652 /* Check the declarations given in a for-loop for satisfying the C99
8653 constraints. If exactly one such decl is found, return it. LOC is
8654 the location of the opening parenthesis of the for loop. The last
8655 parameter allows you to control the "for loop initial declarations
8656 are only allowed in C99 mode". Normally, you should pass
8657 flag_isoc99 as that parameter. But in some cases (Objective-C
8658 foreach loop, for example) we want to run the checks in this
8659 function even if not in C99 mode, so we allow the caller to turn
8660 off the error about not being in C99 mode.
8664 check_for_loop_decls (location_t loc
, bool turn_off_iso_c99_error
)
8666 struct c_binding
*b
;
8667 tree one_decl
= NULL_TREE
;
8670 if (!turn_off_iso_c99_error
)
8672 static bool hint
= true;
8673 /* If we get here, declarations have been used in a for loop without
8674 the C99 for loop scope. This doesn't make much sense, so don't
8676 error_at (loc
, "%<for%> loop initial declarations "
8677 "are only allowed in C99 or C11 mode");
8681 "use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 "
8682 "to compile your code");
8687 /* C99 subclause 6.8.5 paragraph 3:
8689 [#3] The declaration part of a for statement shall only
8690 declare identifiers for objects having storage class auto or
8693 It isn't clear whether, in this sentence, "identifiers" binds to
8694 "shall only declare" or to "objects" - that is, whether all identifiers
8695 declared must be identifiers for objects, or whether the restriction
8696 only applies to those that are. (A question on this in comp.std.c
8697 in November 2000 received no answer.) We implement the strictest
8698 interpretation, to avoid creating an extension which later causes
8701 for (b
= current_scope
->bindings
; b
; b
= b
->prev
)
8704 tree decl
= b
->decl
;
8709 switch (TREE_CODE (decl
))
8713 location_t decl_loc
= DECL_SOURCE_LOCATION (decl
);
8714 if (TREE_STATIC (decl
))
8716 "declaration of static variable %qD in %<for%> loop "
8717 "initial declaration", decl
);
8718 else if (DECL_EXTERNAL (decl
))
8720 "declaration of %<extern%> variable %qD in %<for%> loop "
8721 "initial declaration", decl
);
8727 "%<struct %E%> declared in %<for%> loop initial "
8732 "%<union %E%> declared in %<for%> loop initial declaration",
8736 error_at (loc
, "%<enum %E%> declared in %<for%> loop "
8737 "initial declaration", id
);
8740 error_at (loc
, "declaration of non-variable "
8741 "%qD in %<for%> loop initial declaration", decl
);
8748 return n_decls
== 1 ? one_decl
: NULL_TREE
;
8751 /* Save and reinitialize the variables
8752 used during compilation of a C function. */
8755 c_push_function_context (void)
8757 struct language_function
*p
= cfun
->language
;
8758 /* cfun->language might have been already allocated by the use of
8759 -Wunused-local-typedefs. In that case, just re-use it. */
8761 cfun
->language
= p
= ggc_alloc_cleared_language_function ();
8763 p
->base
.x_stmt_tree
= c_stmt_tree
;
8764 c_stmt_tree
.x_cur_stmt_list
= vec_safe_copy (c_stmt_tree
.x_cur_stmt_list
);
8765 p
->x_break_label
= c_break_label
;
8766 p
->x_cont_label
= c_cont_label
;
8767 p
->x_switch_stack
= c_switch_stack
;
8768 p
->arg_info
= current_function_arg_info
;
8769 p
->returns_value
= current_function_returns_value
;
8770 p
->returns_null
= current_function_returns_null
;
8771 p
->returns_abnormally
= current_function_returns_abnormally
;
8772 p
->warn_about_return_type
= warn_about_return_type
;
8774 push_function_context ();
8777 /* Restore the variables used during compilation of a C function. */
8780 c_pop_function_context (void)
8782 struct language_function
*p
;
8784 pop_function_context ();
8787 /* When -Wunused-local-typedefs is in effect, cfun->languages is
8788 used to store data throughout the life time of the current cfun,
8789 So don't deallocate it. */
8790 if (!warn_unused_local_typedefs
)
8791 cfun
->language
= NULL
;
8793 if (DECL_STRUCT_FUNCTION (current_function_decl
) == 0
8794 && DECL_SAVED_TREE (current_function_decl
) == NULL_TREE
)
8796 /* Stop pointing to the local nodes about to be freed. */
8797 /* But DECL_INITIAL must remain nonzero so we know this
8798 was an actual function definition. */
8799 DECL_INITIAL (current_function_decl
) = error_mark_node
;
8800 DECL_ARGUMENTS (current_function_decl
) = 0;
8803 c_stmt_tree
= p
->base
.x_stmt_tree
;
8804 p
->base
.x_stmt_tree
.x_cur_stmt_list
= NULL
;
8805 c_break_label
= p
->x_break_label
;
8806 c_cont_label
= p
->x_cont_label
;
8807 c_switch_stack
= p
->x_switch_stack
;
8808 current_function_arg_info
= p
->arg_info
;
8809 current_function_returns_value
= p
->returns_value
;
8810 current_function_returns_null
= p
->returns_null
;
8811 current_function_returns_abnormally
= p
->returns_abnormally
;
8812 warn_about_return_type
= p
->warn_about_return_type
;
8815 /* The functions below are required for functionality of doing
8816 function at once processing in the C front end. Currently these
8817 functions are not called from anywhere in the C front end, but as
8818 these changes continue, that will change. */
8820 /* Returns the stmt_tree (if any) to which statements are currently
8821 being added. If there is no active statement-tree, NULL is
8825 current_stmt_tree (void)
8827 return &c_stmt_tree
;
8830 /* Return the global value of T as a symbol. */
8833 identifier_global_value (tree t
)
8835 struct c_binding
*b
;
8837 for (b
= I_SYMBOL_BINDING (t
); b
; b
= b
->shadowed
)
8838 if (B_IN_FILE_SCOPE (b
) || B_IN_EXTERNAL_SCOPE (b
))
8844 /* In C, the only C-linkage public declaration is at file scope. */
8847 c_linkage_bindings (tree name
)
8849 return identifier_global_value (name
);
8852 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
8853 otherwise the name is found in ridpointers from RID_INDEX. */
8856 record_builtin_type (enum rid rid_index
, const char *name
, tree type
)
8860 id
= ridpointers
[(int) rid_index
];
8862 id
= get_identifier (name
);
8863 decl
= build_decl (UNKNOWN_LOCATION
, TYPE_DECL
, id
, type
);
8865 if (debug_hooks
->type_decl
)
8866 debug_hooks
->type_decl (decl
, false);
8869 /* Build the void_list_node (void_type_node having been created). */
8871 build_void_list_node (void)
8873 tree t
= build_tree_list (NULL_TREE
, void_type_node
);
8877 /* Return a c_parm structure with the given SPECS, ATTRS and DECLARATOR. */
8880 build_c_parm (struct c_declspecs
*specs
, tree attrs
,
8881 struct c_declarator
*declarator
)
8883 struct c_parm
*ret
= XOBNEW (&parser_obstack
, struct c_parm
);
8886 ret
->declarator
= declarator
;
8890 /* Return a declarator with nested attributes. TARGET is the inner
8891 declarator to which these attributes apply. ATTRS are the
8894 struct c_declarator
*
8895 build_attrs_declarator (tree attrs
, struct c_declarator
*target
)
8897 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
8898 ret
->kind
= cdk_attrs
;
8899 ret
->declarator
= target
;
8900 ret
->u
.attrs
= attrs
;
8904 /* Return a declarator for a function with arguments specified by ARGS
8905 and return type specified by TARGET. */
8907 struct c_declarator
*
8908 build_function_declarator (struct c_arg_info
*args
,
8909 struct c_declarator
*target
)
8911 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
8912 ret
->kind
= cdk_function
;
8913 ret
->declarator
= target
;
8914 ret
->u
.arg_info
= args
;
8918 /* Return a declarator for the identifier IDENT (which may be
8919 NULL_TREE for an abstract declarator). */
8921 struct c_declarator
*
8922 build_id_declarator (tree ident
)
8924 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
8926 ret
->declarator
= 0;
8928 /* Default value - may get reset to a more precise location. */
8929 ret
->id_loc
= input_location
;
8933 /* Return something to represent absolute declarators containing a *.
8934 TARGET is the absolute declarator that the * contains.
8935 TYPE_QUALS_ATTRS is a structure for type qualifiers and attributes
8936 to apply to the pointer type. */
8938 struct c_declarator
*
8939 make_pointer_declarator (struct c_declspecs
*type_quals_attrs
,
8940 struct c_declarator
*target
)
8944 struct c_declarator
*itarget
= target
;
8945 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
8946 if (type_quals_attrs
)
8948 attrs
= type_quals_attrs
->attrs
;
8949 quals
= quals_from_declspecs (type_quals_attrs
);
8950 if (attrs
!= NULL_TREE
)
8951 itarget
= build_attrs_declarator (attrs
, target
);
8953 ret
->kind
= cdk_pointer
;
8954 ret
->declarator
= itarget
;
8955 ret
->u
.pointer_quals
= quals
;
8959 /* Return a pointer to a structure for an empty list of declaration
8962 struct c_declspecs
*
8963 build_null_declspecs (void)
8965 struct c_declspecs
*ret
= XOBNEW (&parser_obstack
, struct c_declspecs
);
8966 memset (&ret
->locations
, 0, cdw_number_of_elements
);
8971 ret
->align_log
= -1;
8972 ret
->typespec_word
= cts_none
;
8973 ret
->storage_class
= csc_none
;
8974 ret
->expr_const_operands
= true;
8975 ret
->declspecs_seen_p
= false;
8976 ret
->typespec_kind
= ctsk_none
;
8977 ret
->non_sc_seen_p
= false;
8978 ret
->typedef_p
= false;
8979 ret
->explicit_signed_p
= false;
8980 ret
->deprecated_p
= false;
8981 ret
->default_int_p
= false;
8982 ret
->long_p
= false;
8983 ret
->long_long_p
= false;
8984 ret
->short_p
= false;
8985 ret
->signed_p
= false;
8986 ret
->unsigned_p
= false;
8987 ret
->complex_p
= false;
8988 ret
->inline_p
= false;
8989 ret
->noreturn_p
= false;
8990 ret
->thread_p
= false;
8991 ret
->thread_gnu_p
= false;
8992 ret
->const_p
= false;
8993 ret
->volatile_p
= false;
8994 ret
->atomic_p
= false;
8995 ret
->restrict_p
= false;
8996 ret
->saturating_p
= false;
8997 ret
->alignas_p
= false;
8998 ret
->address_space
= ADDR_SPACE_GENERIC
;
9002 /* Add the address space ADDRSPACE to the declaration specifiers
9003 SPECS, returning SPECS. */
9005 struct c_declspecs
*
9006 declspecs_add_addrspace (source_location location
,
9007 struct c_declspecs
*specs
, addr_space_t as
)
9009 specs
->non_sc_seen_p
= true;
9010 specs
->declspecs_seen_p
= true;
9012 if (!ADDR_SPACE_GENERIC_P (specs
->address_space
)
9013 && specs
->address_space
!= as
)
9014 error ("incompatible address space qualifiers %qs and %qs",
9015 c_addr_space_name (as
),
9016 c_addr_space_name (specs
->address_space
));
9019 specs
->address_space
= as
;
9020 specs
->locations
[cdw_address_space
] = location
;
9025 /* Add the type qualifier QUAL to the declaration specifiers SPECS,
9028 struct c_declspecs
*
9029 declspecs_add_qual (source_location loc
,
9030 struct c_declspecs
*specs
, tree qual
)
9034 specs
->non_sc_seen_p
= true;
9035 specs
->declspecs_seen_p
= true;
9036 gcc_assert (TREE_CODE (qual
) == IDENTIFIER_NODE
9037 && C_IS_RESERVED_WORD (qual
));
9038 i
= C_RID_CODE (qual
);
9042 dupe
= specs
->const_p
;
9043 specs
->const_p
= true;
9044 specs
->locations
[cdw_const
] = loc
;
9047 dupe
= specs
->volatile_p
;
9048 specs
->volatile_p
= true;
9049 specs
->locations
[cdw_volatile
] = loc
;
9052 dupe
= specs
->restrict_p
;
9053 specs
->restrict_p
= true;
9054 specs
->locations
[cdw_restrict
] = loc
;
9057 dupe
= specs
->atomic_p
;
9058 specs
->atomic_p
= true;
9063 if (dupe
&& !flag_isoc99
)
9064 pedwarn (loc
, OPT_Wpedantic
, "duplicate %qE", qual
);
9068 /* Add the type specifier TYPE to the declaration specifiers SPECS,
9071 struct c_declspecs
*
9072 declspecs_add_type (location_t loc
, struct c_declspecs
*specs
,
9073 struct c_typespec spec
)
9075 tree type
= spec
.spec
;
9076 specs
->non_sc_seen_p
= true;
9077 specs
->declspecs_seen_p
= true;
9078 specs
->typespec_kind
= spec
.kind
;
9079 if (TREE_DEPRECATED (type
))
9080 specs
->deprecated_p
= true;
9082 /* Handle type specifier keywords. */
9083 if (TREE_CODE (type
) == IDENTIFIER_NODE
9084 && C_IS_RESERVED_WORD (type
)
9085 && C_RID_CODE (type
) != RID_CXX_COMPAT_WARN
)
9087 enum rid i
= C_RID_CODE (type
);
9090 error_at (loc
, "two or more data types in declaration specifiers");
9093 if ((int) i
<= (int) RID_LAST_MODIFIER
)
9095 /* "long", "short", "signed", "unsigned", "_Complex" or "_Sat". */
9100 if (specs
->long_long_p
)
9102 error_at (loc
, "%<long long long%> is too long for GCC");
9107 if (specs
->typespec_word
== cts_double
)
9110 ("both %<long long%> and %<double%> in "
9111 "declaration specifiers"));
9114 pedwarn_c90 (loc
, OPT_Wlong_long
,
9115 "ISO C90 does not support %<long long%>");
9116 specs
->long_long_p
= 1;
9117 specs
->locations
[cdw_long_long
] = loc
;
9122 ("both %<long%> and %<short%> in "
9123 "declaration specifiers"));
9124 else if (specs
->typespec_word
== cts_auto_type
)
9126 ("both %<long%> and %<__auto_type%> in "
9127 "declaration specifiers"));
9128 else if (specs
->typespec_word
== cts_void
)
9130 ("both %<long%> and %<void%> in "
9131 "declaration specifiers"));
9132 else if (specs
->typespec_word
== cts_int128
)
9134 ("both %<long%> and %<__int128%> in "
9135 "declaration specifiers"));
9136 else if (specs
->typespec_word
== cts_bool
)
9138 ("both %<long%> and %<_Bool%> in "
9139 "declaration specifiers"));
9140 else if (specs
->typespec_word
== cts_char
)
9142 ("both %<long%> and %<char%> in "
9143 "declaration specifiers"));
9144 else if (specs
->typespec_word
== cts_float
)
9146 ("both %<long%> and %<float%> in "
9147 "declaration specifiers"));
9148 else if (specs
->typespec_word
== cts_dfloat32
)
9150 ("both %<long%> and %<_Decimal32%> in "
9151 "declaration specifiers"));
9152 else if (specs
->typespec_word
== cts_dfloat64
)
9154 ("both %<long%> and %<_Decimal64%> in "
9155 "declaration specifiers"));
9156 else if (specs
->typespec_word
== cts_dfloat128
)
9158 ("both %<long%> and %<_Decimal128%> in "
9159 "declaration specifiers"));
9162 specs
->long_p
= true;
9163 specs
->locations
[cdw_long
] = loc
;
9167 dupe
= specs
->short_p
;
9170 ("both %<long%> and %<short%> in "
9171 "declaration specifiers"));
9172 else if (specs
->typespec_word
== cts_auto_type
)
9174 ("both %<short%> and %<__auto_type%> in "
9175 "declaration specifiers"));
9176 else if (specs
->typespec_word
== cts_void
)
9178 ("both %<short%> and %<void%> in "
9179 "declaration specifiers"));
9180 else if (specs
->typespec_word
== cts_int128
)
9182 ("both %<short%> and %<__int128%> in "
9183 "declaration specifiers"));
9184 else if (specs
->typespec_word
== cts_bool
)
9186 ("both %<short%> and %<_Bool%> in "
9187 "declaration specifiers"));
9188 else if (specs
->typespec_word
== cts_char
)
9190 ("both %<short%> and %<char%> in "
9191 "declaration specifiers"));
9192 else if (specs
->typespec_word
== cts_float
)
9194 ("both %<short%> and %<float%> in "
9195 "declaration specifiers"));
9196 else if (specs
->typespec_word
== cts_double
)
9198 ("both %<short%> and %<double%> in "
9199 "declaration specifiers"));
9200 else if (specs
->typespec_word
== cts_dfloat32
)
9202 ("both %<short%> and %<_Decimal32%> in "
9203 "declaration specifiers"));
9204 else if (specs
->typespec_word
== cts_dfloat64
)
9206 ("both %<short%> and %<_Decimal64%> in "
9207 "declaration specifiers"));
9208 else if (specs
->typespec_word
== cts_dfloat128
)
9210 ("both %<short%> and %<_Decimal128%> in "
9211 "declaration specifiers"));
9214 specs
->short_p
= true;
9215 specs
->locations
[cdw_short
] = loc
;
9219 dupe
= specs
->signed_p
;
9220 if (specs
->unsigned_p
)
9222 ("both %<signed%> and %<unsigned%> in "
9223 "declaration specifiers"));
9224 else if (specs
->typespec_word
== cts_auto_type
)
9226 ("both %<signed%> and %<__auto_type%> in "
9227 "declaration specifiers"));
9228 else if (specs
->typespec_word
== cts_void
)
9230 ("both %<signed%> and %<void%> in "
9231 "declaration specifiers"));
9232 else if (specs
->typespec_word
== cts_bool
)
9234 ("both %<signed%> and %<_Bool%> in "
9235 "declaration specifiers"));
9236 else if (specs
->typespec_word
== cts_float
)
9238 ("both %<signed%> and %<float%> in "
9239 "declaration specifiers"));
9240 else if (specs
->typespec_word
== cts_double
)
9242 ("both %<signed%> and %<double%> in "
9243 "declaration specifiers"));
9244 else if (specs
->typespec_word
== cts_dfloat32
)
9246 ("both %<signed%> and %<_Decimal32%> in "
9247 "declaration specifiers"));
9248 else if (specs
->typespec_word
== cts_dfloat64
)
9250 ("both %<signed%> and %<_Decimal64%> in "
9251 "declaration specifiers"));
9252 else if (specs
->typespec_word
== cts_dfloat128
)
9254 ("both %<signed%> and %<_Decimal128%> in "
9255 "declaration specifiers"));
9258 specs
->signed_p
= true;
9259 specs
->locations
[cdw_signed
] = loc
;
9263 dupe
= specs
->unsigned_p
;
9264 if (specs
->signed_p
)
9266 ("both %<signed%> and %<unsigned%> in "
9267 "declaration specifiers"));
9268 else if (specs
->typespec_word
== cts_auto_type
)
9270 ("both %<unsigned%> and %<__auto_type%> in "
9271 "declaration specifiers"));
9272 else if (specs
->typespec_word
== cts_void
)
9274 ("both %<unsigned%> and %<void%> in "
9275 "declaration specifiers"));
9276 else if (specs
->typespec_word
== cts_bool
)
9278 ("both %<unsigned%> and %<_Bool%> in "
9279 "declaration specifiers"));
9280 else if (specs
->typespec_word
== cts_float
)
9282 ("both %<unsigned%> and %<float%> in "
9283 "declaration specifiers"));
9284 else if (specs
->typespec_word
== cts_double
)
9286 ("both %<unsigned%> and %<double%> in "
9287 "declaration specifiers"));
9288 else if (specs
->typespec_word
== cts_dfloat32
)
9290 ("both %<unsigned%> and %<_Decimal32%> in "
9291 "declaration specifiers"));
9292 else if (specs
->typespec_word
== cts_dfloat64
)
9294 ("both %<unsigned%> and %<_Decimal64%> in "
9295 "declaration specifiers"));
9296 else if (specs
->typespec_word
== cts_dfloat128
)
9298 ("both %<unsigned%> and %<_Decimal128%> in "
9299 "declaration specifiers"));
9302 specs
->unsigned_p
= true;
9303 specs
->locations
[cdw_unsigned
] = loc
;
9307 dupe
= specs
->complex_p
;
9308 if (!flag_isoc99
&& !in_system_header_at (loc
))
9309 pedwarn (loc
, OPT_Wpedantic
,
9310 "ISO C90 does not support complex types");
9311 if (specs
->typespec_word
== cts_auto_type
)
9313 ("both %<complex%> and %<__auto_type%> in "
9314 "declaration specifiers"));
9315 else if (specs
->typespec_word
== cts_void
)
9317 ("both %<complex%> and %<void%> in "
9318 "declaration specifiers"));
9319 else if (specs
->typespec_word
== cts_bool
)
9321 ("both %<complex%> and %<_Bool%> in "
9322 "declaration specifiers"));
9323 else if (specs
->typespec_word
== cts_dfloat32
)
9325 ("both %<complex%> and %<_Decimal32%> in "
9326 "declaration specifiers"));
9327 else if (specs
->typespec_word
== cts_dfloat64
)
9329 ("both %<complex%> and %<_Decimal64%> in "
9330 "declaration specifiers"));
9331 else if (specs
->typespec_word
== cts_dfloat128
)
9333 ("both %<complex%> and %<_Decimal128%> in "
9334 "declaration specifiers"));
9335 else if (specs
->typespec_word
== cts_fract
)
9337 ("both %<complex%> and %<_Fract%> in "
9338 "declaration specifiers"));
9339 else if (specs
->typespec_word
== cts_accum
)
9341 ("both %<complex%> and %<_Accum%> in "
9342 "declaration specifiers"));
9343 else if (specs
->saturating_p
)
9345 ("both %<complex%> and %<_Sat%> in "
9346 "declaration specifiers"));
9349 specs
->complex_p
= true;
9350 specs
->locations
[cdw_complex
] = loc
;
9354 dupe
= specs
->saturating_p
;
9355 pedwarn (loc
, OPT_Wpedantic
,
9356 "ISO C does not support saturating types");
9357 if (specs
->typespec_word
== cts_int128
)
9360 ("both %<_Sat%> and %<__int128%> in "
9361 "declaration specifiers"));
9363 else if (specs
->typespec_word
== cts_auto_type
)
9365 ("both %<_Sat%> and %<__auto_type%> in "
9366 "declaration specifiers"));
9367 else if (specs
->typespec_word
== cts_void
)
9369 ("both %<_Sat%> and %<void%> in "
9370 "declaration specifiers"));
9371 else if (specs
->typespec_word
== cts_bool
)
9373 ("both %<_Sat%> and %<_Bool%> in "
9374 "declaration specifiers"));
9375 else if (specs
->typespec_word
== cts_char
)
9377 ("both %<_Sat%> and %<char%> in "
9378 "declaration specifiers"));
9379 else if (specs
->typespec_word
== cts_int
)
9381 ("both %<_Sat%> and %<int%> in "
9382 "declaration specifiers"));
9383 else if (specs
->typespec_word
== cts_float
)
9385 ("both %<_Sat%> and %<float%> in "
9386 "declaration specifiers"));
9387 else if (specs
->typespec_word
== cts_double
)
9389 ("both %<_Sat%> and %<double%> in "
9390 "declaration specifiers"));
9391 else if (specs
->typespec_word
== cts_dfloat32
)
9393 ("both %<_Sat%> and %<_Decimal32%> in "
9394 "declaration specifiers"));
9395 else if (specs
->typespec_word
== cts_dfloat64
)
9397 ("both %<_Sat%> and %<_Decimal64%> in "
9398 "declaration specifiers"));
9399 else if (specs
->typespec_word
== cts_dfloat128
)
9401 ("both %<_Sat%> and %<_Decimal128%> in "
9402 "declaration specifiers"));
9403 else if (specs
->complex_p
)
9405 ("both %<_Sat%> and %<complex%> in "
9406 "declaration specifiers"));
9409 specs
->saturating_p
= true;
9410 specs
->locations
[cdw_saturating
] = loc
;
9418 error_at (loc
, "duplicate %qE", type
);
9424 /* "void", "_Bool", "char", "int", "float", "double", "_Decimal32",
9425 "__int128", "_Decimal64", "_Decimal128", "_Fract", "_Accum" or
9427 if (specs
->typespec_word
!= cts_none
)
9430 "two or more data types in declaration specifiers");
9438 ("both %<long%> and %<__auto_type%> in "
9439 "declaration specifiers"));
9440 else if (specs
->short_p
)
9442 ("both %<short%> and %<__auto_type%> in "
9443 "declaration specifiers"));
9444 else if (specs
->signed_p
)
9446 ("both %<signed%> and %<__auto_type%> in "
9447 "declaration specifiers"));
9448 else if (specs
->unsigned_p
)
9450 ("both %<unsigned%> and %<__auto_type%> in "
9451 "declaration specifiers"));
9452 else if (specs
->complex_p
)
9454 ("both %<complex%> and %<__auto_type%> in "
9455 "declaration specifiers"));
9456 else if (specs
->saturating_p
)
9458 ("both %<_Sat%> and %<__auto_type%> in "
9459 "declaration specifiers"));
9462 specs
->typespec_word
= cts_auto_type
;
9463 specs
->locations
[cdw_typespec
] = loc
;
9467 if (int128_integer_type_node
== NULL_TREE
)
9469 error_at (loc
, "%<__int128%> is not supported for this target");
9472 if (!in_system_header
)
9473 pedwarn (loc
, OPT_Wpedantic
,
9474 "ISO C does not support %<__int128%> type");
9478 ("both %<__int128%> and %<long%> in "
9479 "declaration specifiers"));
9480 else if (specs
->saturating_p
)
9482 ("both %<_Sat%> and %<__int128%> in "
9483 "declaration specifiers"));
9484 else if (specs
->short_p
)
9486 ("both %<__int128%> and %<short%> in "
9487 "declaration specifiers"));
9490 specs
->typespec_word
= cts_int128
;
9491 specs
->locations
[cdw_typespec
] = loc
;
9497 ("both %<long%> and %<void%> in "
9498 "declaration specifiers"));
9499 else if (specs
->short_p
)
9501 ("both %<short%> and %<void%> in "
9502 "declaration specifiers"));
9503 else if (specs
->signed_p
)
9505 ("both %<signed%> and %<void%> in "
9506 "declaration specifiers"));
9507 else if (specs
->unsigned_p
)
9509 ("both %<unsigned%> and %<void%> in "
9510 "declaration specifiers"));
9511 else if (specs
->complex_p
)
9513 ("both %<complex%> and %<void%> in "
9514 "declaration specifiers"));
9515 else if (specs
->saturating_p
)
9517 ("both %<_Sat%> and %<void%> in "
9518 "declaration specifiers"));
9521 specs
->typespec_word
= cts_void
;
9522 specs
->locations
[cdw_typespec
] = loc
;
9528 ("both %<long%> and %<_Bool%> in "
9529 "declaration specifiers"));
9530 else if (specs
->short_p
)
9532 ("both %<short%> and %<_Bool%> in "
9533 "declaration specifiers"));
9534 else if (specs
->signed_p
)
9536 ("both %<signed%> and %<_Bool%> in "
9537 "declaration specifiers"));
9538 else if (specs
->unsigned_p
)
9540 ("both %<unsigned%> and %<_Bool%> in "
9541 "declaration specifiers"));
9542 else if (specs
->complex_p
)
9544 ("both %<complex%> and %<_Bool%> in "
9545 "declaration specifiers"));
9546 else if (specs
->saturating_p
)
9548 ("both %<_Sat%> and %<_Bool%> in "
9549 "declaration specifiers"));
9552 specs
->typespec_word
= cts_bool
;
9553 specs
->locations
[cdw_typespec
] = loc
;
9559 ("both %<long%> and %<char%> in "
9560 "declaration specifiers"));
9561 else if (specs
->short_p
)
9563 ("both %<short%> and %<char%> in "
9564 "declaration specifiers"));
9565 else if (specs
->saturating_p
)
9567 ("both %<_Sat%> and %<char%> in "
9568 "declaration specifiers"));
9571 specs
->typespec_word
= cts_char
;
9572 specs
->locations
[cdw_typespec
] = loc
;
9576 if (specs
->saturating_p
)
9578 ("both %<_Sat%> and %<int%> in "
9579 "declaration specifiers"));
9582 specs
->typespec_word
= cts_int
;
9583 specs
->locations
[cdw_typespec
] = loc
;
9589 ("both %<long%> and %<float%> in "
9590 "declaration specifiers"));
9591 else if (specs
->short_p
)
9593 ("both %<short%> and %<float%> in "
9594 "declaration specifiers"));
9595 else if (specs
->signed_p
)
9597 ("both %<signed%> and %<float%> in "
9598 "declaration specifiers"));
9599 else if (specs
->unsigned_p
)
9601 ("both %<unsigned%> and %<float%> in "
9602 "declaration specifiers"));
9603 else if (specs
->saturating_p
)
9605 ("both %<_Sat%> and %<float%> in "
9606 "declaration specifiers"));
9609 specs
->typespec_word
= cts_float
;
9610 specs
->locations
[cdw_typespec
] = loc
;
9614 if (specs
->long_long_p
)
9616 ("both %<long long%> and %<double%> in "
9617 "declaration specifiers"));
9618 else if (specs
->short_p
)
9620 ("both %<short%> and %<double%> in "
9621 "declaration specifiers"));
9622 else if (specs
->signed_p
)
9624 ("both %<signed%> and %<double%> in "
9625 "declaration specifiers"));
9626 else if (specs
->unsigned_p
)
9628 ("both %<unsigned%> and %<double%> in "
9629 "declaration specifiers"));
9630 else if (specs
->saturating_p
)
9632 ("both %<_Sat%> and %<double%> in "
9633 "declaration specifiers"));
9636 specs
->typespec_word
= cts_double
;
9637 specs
->locations
[cdw_typespec
] = loc
;
9645 if (i
== RID_DFLOAT32
)
9647 else if (i
== RID_DFLOAT64
)
9650 str
= "_Decimal128";
9651 if (specs
->long_long_p
)
9653 ("both %<long long%> and %<%s%> in "
9654 "declaration specifiers"),
9658 ("both %<long%> and %<%s%> in "
9659 "declaration specifiers"),
9661 else if (specs
->short_p
)
9663 ("both %<short%> and %<%s%> in "
9664 "declaration specifiers"),
9666 else if (specs
->signed_p
)
9668 ("both %<signed%> and %<%s%> in "
9669 "declaration specifiers"),
9671 else if (specs
->unsigned_p
)
9673 ("both %<unsigned%> and %<%s%> in "
9674 "declaration specifiers"),
9676 else if (specs
->complex_p
)
9678 ("both %<complex%> and %<%s%> in "
9679 "declaration specifiers"),
9681 else if (specs
->saturating_p
)
9683 ("both %<_Sat%> and %<%s%> in "
9684 "declaration specifiers"),
9686 else if (i
== RID_DFLOAT32
)
9687 specs
->typespec_word
= cts_dfloat32
;
9688 else if (i
== RID_DFLOAT64
)
9689 specs
->typespec_word
= cts_dfloat64
;
9691 specs
->typespec_word
= cts_dfloat128
;
9692 specs
->locations
[cdw_typespec
] = loc
;
9694 if (!targetm
.decimal_float_supported_p ())
9696 ("decimal floating point not supported "
9697 "for this target"));
9698 pedwarn (loc
, OPT_Wpedantic
,
9699 "ISO C does not support decimal floating point");
9709 if (specs
->complex_p
)
9711 ("both %<complex%> and %<%s%> in "
9712 "declaration specifiers"),
9714 else if (i
== RID_FRACT
)
9715 specs
->typespec_word
= cts_fract
;
9717 specs
->typespec_word
= cts_accum
;
9718 specs
->locations
[cdw_typespec
] = loc
;
9720 if (!targetm
.fixed_point_supported_p ())
9722 "fixed-point types not supported for this target");
9723 pedwarn (loc
, OPT_Wpedantic
,
9724 "ISO C does not support fixed-point types");
9727 /* ObjC reserved word "id", handled below. */
9733 /* Now we have a typedef (a TYPE_DECL node), an identifier (some
9734 form of ObjC type, cases such as "int" and "long" being handled
9735 above), a TYPE (struct, union, enum and typeof specifiers) or an
9736 ERROR_MARK. In none of these cases may there have previously
9737 been any type specifiers. */
9738 if (specs
->type
|| specs
->typespec_word
!= cts_none
9739 || specs
->long_p
|| specs
->short_p
|| specs
->signed_p
9740 || specs
->unsigned_p
|| specs
->complex_p
)
9741 error_at (loc
, "two or more data types in declaration specifiers");
9742 else if (TREE_CODE (type
) == TYPE_DECL
)
9744 if (TREE_TYPE (type
) == error_mark_node
)
9745 ; /* Allow the type to default to int to avoid cascading errors. */
9748 specs
->type
= TREE_TYPE (type
);
9749 specs
->decl_attr
= DECL_ATTRIBUTES (type
);
9750 specs
->typedef_p
= true;
9751 specs
->explicit_signed_p
= C_TYPEDEF_EXPLICITLY_SIGNED (type
);
9752 specs
->locations
[cdw_typedef
] = loc
;
9754 /* If this typedef name is defined in a struct, then a C++
9755 lookup would return a different value. */
9757 && I_SYMBOL_BINDING (DECL_NAME (type
))->in_struct
)
9758 warning_at (loc
, OPT_Wc___compat
,
9759 "C++ lookup of %qD would return a field, not a type",
9762 /* If we are parsing a struct, record that a struct field
9764 if (warn_cxx_compat
&& struct_parse_info
!= NULL
)
9765 struct_parse_info
->typedefs_seen
.safe_push (type
);
9768 else if (TREE_CODE (type
) == IDENTIFIER_NODE
)
9770 tree t
= lookup_name (type
);
9771 if (!t
|| TREE_CODE (t
) != TYPE_DECL
)
9772 error_at (loc
, "%qE fails to be a typedef or built in type", type
);
9773 else if (TREE_TYPE (t
) == error_mark_node
)
9777 specs
->type
= TREE_TYPE (t
);
9778 specs
->locations
[cdw_typespec
] = loc
;
9783 if (TREE_CODE (type
) != ERROR_MARK
&& spec
.kind
== ctsk_typeof
)
9785 specs
->typedef_p
= true;
9786 specs
->locations
[cdw_typedef
] = loc
;
9790 specs
->expr
= build2 (COMPOUND_EXPR
, TREE_TYPE (spec
.expr
),
9791 specs
->expr
, spec
.expr
);
9793 specs
->expr
= spec
.expr
;
9794 specs
->expr_const_operands
&= spec
.expr_const_operands
;
9803 /* Add the storage class specifier or function specifier SCSPEC to the
9804 declaration specifiers SPECS, returning SPECS. */
9806 struct c_declspecs
*
9807 declspecs_add_scspec (source_location loc
,
9808 struct c_declspecs
*specs
,
9812 enum c_storage_class n
= csc_none
;
9814 specs
->declspecs_seen_p
= true;
9815 gcc_assert (TREE_CODE (scspec
) == IDENTIFIER_NODE
9816 && C_IS_RESERVED_WORD (scspec
));
9817 i
= C_RID_CODE (scspec
);
9818 if (specs
->non_sc_seen_p
)
9819 warning (OPT_Wold_style_declaration
,
9820 "%qE is not at beginning of declaration", scspec
);
9824 /* C99 permits duplicate inline. Although of doubtful utility,
9825 it seems simplest to permit it in gnu89 mode as well, as
9826 there is also little utility in maintaining this as a
9827 difference between gnu89 and C99 inline. */
9829 specs
->inline_p
= true;
9830 specs
->locations
[cdw_inline
] = loc
;
9833 /* Duplicate _Noreturn is permitted. */
9835 specs
->noreturn_p
= true;
9836 specs
->locations
[cdw_noreturn
] = loc
;
9839 dupe
= specs
->thread_p
;
9840 if (specs
->storage_class
== csc_auto
)
9841 error ("%qE used with %<auto%>", scspec
);
9842 else if (specs
->storage_class
== csc_register
)
9843 error ("%qE used with %<register%>", scspec
);
9844 else if (specs
->storage_class
== csc_typedef
)
9845 error ("%qE used with %<typedef%>", scspec
);
9848 specs
->thread_p
= true;
9849 specs
->thread_gnu_p
= (strcmp (IDENTIFIER_POINTER (scspec
),
9851 /* A diagnostic is not required for the use of this
9852 identifier in the implementation namespace; only diagnose
9853 it for the C11 spelling because of existing code using
9854 the other spelling. */
9855 if (!flag_isoc11
&& !specs
->thread_gnu_p
)
9858 pedwarn (loc
, OPT_Wpedantic
,
9859 "ISO C99 does not support %qE", scspec
);
9861 pedwarn (loc
, OPT_Wpedantic
,
9862 "ISO C90 does not support %qE", scspec
);
9864 specs
->locations
[cdw_thread
] = loc
;
9872 /* Diagnose "__thread extern". */
9873 if (specs
->thread_p
&& specs
->thread_gnu_p
)
9874 error ("%<__thread%> before %<extern%>");
9881 /* Diagnose "__thread static". */
9882 if (specs
->thread_p
&& specs
->thread_gnu_p
)
9883 error ("%<__thread%> before %<static%>");
9891 if (n
!= csc_none
&& n
== specs
->storage_class
)
9895 if (i
== RID_THREAD
)
9896 error ("duplicate %<_Thread_local%> or %<__thread%>");
9898 error ("duplicate %qE", scspec
);
9902 if (specs
->storage_class
!= csc_none
&& n
!= specs
->storage_class
)
9904 error ("multiple storage classes in declaration specifiers");
9908 specs
->storage_class
= n
;
9909 specs
->locations
[cdw_storage_class
] = loc
;
9910 if (n
!= csc_extern
&& n
!= csc_static
&& specs
->thread_p
)
9912 error ("%qs used with %qE",
9913 specs
->thread_gnu_p
? "__thread" : "_Thread_local",
9915 specs
->thread_p
= false;
9922 /* Add the attributes ATTRS to the declaration specifiers SPECS,
9925 struct c_declspecs
*
9926 declspecs_add_attrs (source_location loc
, struct c_declspecs
*specs
, tree attrs
)
9928 specs
->attrs
= chainon (attrs
, specs
->attrs
);
9929 specs
->locations
[cdw_attributes
] = loc
;
9930 specs
->declspecs_seen_p
= true;
9934 /* Add an _Alignas specifier (expression ALIGN, or type whose
9935 alignment is ALIGN) to the declaration specifiers SPECS, returning
9937 struct c_declspecs
*
9938 declspecs_add_alignas (source_location loc
,
9939 struct c_declspecs
*specs
, tree align
)
9942 specs
->alignas_p
= true;
9943 specs
->locations
[cdw_alignas
] = loc
;
9944 if (align
== error_mark_node
)
9946 align_log
= check_user_alignment (align
, true);
9947 if (align_log
> specs
->align_log
)
9948 specs
->align_log
= align_log
;
9952 /* Combine "long", "short", "signed", "unsigned" and "_Complex" type
9953 specifiers with any other type specifier to determine the resulting
9954 type. This is where ISO C checks on complex types are made, since
9955 "_Complex long" is a prefix of the valid ISO C type "_Complex long
9958 struct c_declspecs
*
9959 finish_declspecs (struct c_declspecs
*specs
)
9961 /* If a type was specified as a whole, we have no modifiers and are
9963 if (specs
->type
!= NULL_TREE
)
9965 gcc_assert (!specs
->long_p
&& !specs
->long_long_p
&& !specs
->short_p
9966 && !specs
->signed_p
&& !specs
->unsigned_p
9967 && !specs
->complex_p
);
9969 /* Set a dummy type. */
9970 if (TREE_CODE (specs
->type
) == ERROR_MARK
)
9971 specs
->type
= integer_type_node
;
9975 /* If none of "void", "_Bool", "char", "int", "float" or "double"
9976 has been specified, treat it as "int" unless "_Complex" is
9977 present and there are no other specifiers. If we just have
9978 "_Complex", it is equivalent to "_Complex double", but e.g.
9979 "_Complex short" is equivalent to "_Complex short int". */
9980 if (specs
->typespec_word
== cts_none
)
9982 if (specs
->saturating_p
)
9984 error_at (specs
->locations
[cdw_saturating
],
9985 "%<_Sat%> is used without %<_Fract%> or %<_Accum%>");
9986 if (!targetm
.fixed_point_supported_p ())
9987 error_at (specs
->locations
[cdw_saturating
],
9988 "fixed-point types not supported for this target");
9989 specs
->typespec_word
= cts_fract
;
9991 else if (specs
->long_p
|| specs
->short_p
9992 || specs
->signed_p
|| specs
->unsigned_p
)
9994 specs
->typespec_word
= cts_int
;
9996 else if (specs
->complex_p
)
9998 specs
->typespec_word
= cts_double
;
9999 pedwarn (specs
->locations
[cdw_complex
], OPT_Wpedantic
,
10000 "ISO C does not support plain %<complex%> meaning "
10001 "%<double complex%>");
10005 specs
->typespec_word
= cts_int
;
10006 specs
->default_int_p
= true;
10007 /* We don't diagnose this here because grokdeclarator will
10008 give more specific diagnostics according to whether it is
10009 a function definition. */
10013 /* If "signed" was specified, record this to distinguish "int" and
10014 "signed int" in the case of a bit-field with
10015 -funsigned-bitfields. */
10016 specs
->explicit_signed_p
= specs
->signed_p
;
10018 /* Now compute the actual type. */
10019 switch (specs
->typespec_word
)
10021 case cts_auto_type
:
10022 gcc_assert (!specs
->long_p
&& !specs
->short_p
10023 && !specs
->signed_p
&& !specs
->unsigned_p
10024 && !specs
->complex_p
);
10025 /* Type to be filled in later. */
10028 gcc_assert (!specs
->long_p
&& !specs
->short_p
10029 && !specs
->signed_p
&& !specs
->unsigned_p
10030 && !specs
->complex_p
);
10031 specs
->type
= void_type_node
;
10034 gcc_assert (!specs
->long_p
&& !specs
->short_p
10035 && !specs
->signed_p
&& !specs
->unsigned_p
10036 && !specs
->complex_p
);
10037 specs
->type
= boolean_type_node
;
10040 gcc_assert (!specs
->long_p
&& !specs
->short_p
);
10041 gcc_assert (!(specs
->signed_p
&& specs
->unsigned_p
));
10042 if (specs
->signed_p
)
10043 specs
->type
= signed_char_type_node
;
10044 else if (specs
->unsigned_p
)
10045 specs
->type
= unsigned_char_type_node
;
10047 specs
->type
= char_type_node
;
10048 if (specs
->complex_p
)
10050 pedwarn (specs
->locations
[cdw_complex
], OPT_Wpedantic
,
10051 "ISO C does not support complex integer types");
10052 specs
->type
= build_complex_type (specs
->type
);
10056 gcc_assert (!specs
->long_p
&& !specs
->short_p
&& !specs
->long_long_p
);
10057 gcc_assert (!(specs
->signed_p
&& specs
->unsigned_p
));
10058 specs
->type
= (specs
->unsigned_p
10059 ? int128_unsigned_type_node
10060 : int128_integer_type_node
);
10061 if (specs
->complex_p
)
10063 pedwarn (specs
->locations
[cdw_complex
], OPT_Wpedantic
,
10064 "ISO C does not support complex integer types");
10065 specs
->type
= build_complex_type (specs
->type
);
10069 gcc_assert (!(specs
->long_p
&& specs
->short_p
));
10070 gcc_assert (!(specs
->signed_p
&& specs
->unsigned_p
));
10071 if (specs
->long_long_p
)
10072 specs
->type
= (specs
->unsigned_p
10073 ? long_long_unsigned_type_node
10074 : long_long_integer_type_node
);
10075 else if (specs
->long_p
)
10076 specs
->type
= (specs
->unsigned_p
10077 ? long_unsigned_type_node
10078 : long_integer_type_node
);
10079 else if (specs
->short_p
)
10080 specs
->type
= (specs
->unsigned_p
10081 ? short_unsigned_type_node
10082 : short_integer_type_node
);
10084 specs
->type
= (specs
->unsigned_p
10085 ? unsigned_type_node
10086 : integer_type_node
);
10087 if (specs
->complex_p
)
10089 pedwarn (specs
->locations
[cdw_complex
], OPT_Wpedantic
,
10090 "ISO C does not support complex integer types");
10091 specs
->type
= build_complex_type (specs
->type
);
10095 gcc_assert (!specs
->long_p
&& !specs
->short_p
10096 && !specs
->signed_p
&& !specs
->unsigned_p
);
10097 specs
->type
= (specs
->complex_p
10098 ? complex_float_type_node
10099 : float_type_node
);
10102 gcc_assert (!specs
->long_long_p
&& !specs
->short_p
10103 && !specs
->signed_p
&& !specs
->unsigned_p
);
10106 specs
->type
= (specs
->complex_p
10107 ? complex_long_double_type_node
10108 : long_double_type_node
);
10112 specs
->type
= (specs
->complex_p
10113 ? complex_double_type_node
10114 : double_type_node
);
10119 case cts_dfloat128
:
10120 gcc_assert (!specs
->long_p
&& !specs
->long_long_p
&& !specs
->short_p
10121 && !specs
->signed_p
&& !specs
->unsigned_p
&& !specs
->complex_p
);
10122 if (specs
->typespec_word
== cts_dfloat32
)
10123 specs
->type
= dfloat32_type_node
;
10124 else if (specs
->typespec_word
== cts_dfloat64
)
10125 specs
->type
= dfloat64_type_node
;
10127 specs
->type
= dfloat128_type_node
;
10130 gcc_assert (!specs
->complex_p
);
10131 if (!targetm
.fixed_point_supported_p ())
10132 specs
->type
= integer_type_node
;
10133 else if (specs
->saturating_p
)
10135 if (specs
->long_long_p
)
10136 specs
->type
= specs
->unsigned_p
10137 ? sat_unsigned_long_long_fract_type_node
10138 : sat_long_long_fract_type_node
;
10139 else if (specs
->long_p
)
10140 specs
->type
= specs
->unsigned_p
10141 ? sat_unsigned_long_fract_type_node
10142 : sat_long_fract_type_node
;
10143 else if (specs
->short_p
)
10144 specs
->type
= specs
->unsigned_p
10145 ? sat_unsigned_short_fract_type_node
10146 : sat_short_fract_type_node
;
10148 specs
->type
= specs
->unsigned_p
10149 ? sat_unsigned_fract_type_node
10150 : sat_fract_type_node
;
10154 if (specs
->long_long_p
)
10155 specs
->type
= specs
->unsigned_p
10156 ? unsigned_long_long_fract_type_node
10157 : long_long_fract_type_node
;
10158 else if (specs
->long_p
)
10159 specs
->type
= specs
->unsigned_p
10160 ? unsigned_long_fract_type_node
10161 : long_fract_type_node
;
10162 else if (specs
->short_p
)
10163 specs
->type
= specs
->unsigned_p
10164 ? unsigned_short_fract_type_node
10165 : short_fract_type_node
;
10167 specs
->type
= specs
->unsigned_p
10168 ? unsigned_fract_type_node
10173 gcc_assert (!specs
->complex_p
);
10174 if (!targetm
.fixed_point_supported_p ())
10175 specs
->type
= integer_type_node
;
10176 else if (specs
->saturating_p
)
10178 if (specs
->long_long_p
)
10179 specs
->type
= specs
->unsigned_p
10180 ? sat_unsigned_long_long_accum_type_node
10181 : sat_long_long_accum_type_node
;
10182 else if (specs
->long_p
)
10183 specs
->type
= specs
->unsigned_p
10184 ? sat_unsigned_long_accum_type_node
10185 : sat_long_accum_type_node
;
10186 else if (specs
->short_p
)
10187 specs
->type
= specs
->unsigned_p
10188 ? sat_unsigned_short_accum_type_node
10189 : sat_short_accum_type_node
;
10191 specs
->type
= specs
->unsigned_p
10192 ? sat_unsigned_accum_type_node
10193 : sat_accum_type_node
;
10197 if (specs
->long_long_p
)
10198 specs
->type
= specs
->unsigned_p
10199 ? unsigned_long_long_accum_type_node
10200 : long_long_accum_type_node
;
10201 else if (specs
->long_p
)
10202 specs
->type
= specs
->unsigned_p
10203 ? unsigned_long_accum_type_node
10204 : long_accum_type_node
;
10205 else if (specs
->short_p
)
10206 specs
->type
= specs
->unsigned_p
10207 ? unsigned_short_accum_type_node
10208 : short_accum_type_node
;
10210 specs
->type
= specs
->unsigned_p
10211 ? unsigned_accum_type_node
10216 gcc_unreachable ();
10222 /* A subroutine of c_write_global_declarations. Perform final processing
10223 on one file scope's declarations (or the external scope's declarations),
10227 c_write_global_declarations_1 (tree globals
)
10232 /* Process the decls in the order they were written. */
10233 for (decl
= globals
; decl
; decl
= DECL_CHAIN (decl
))
10235 /* Check for used but undefined static functions using the C
10236 standard's definition of "used", and set TREE_NO_WARNING so
10237 that check_global_declarations doesn't repeat the check. */
10238 if (TREE_CODE (decl
) == FUNCTION_DECL
10239 && DECL_INITIAL (decl
) == 0
10240 && DECL_EXTERNAL (decl
)
10241 && !TREE_PUBLIC (decl
)
10242 && C_DECL_USED (decl
))
10244 pedwarn (input_location
, 0, "%q+F used but never defined", decl
);
10245 TREE_NO_WARNING (decl
) = 1;
10248 wrapup_global_declaration_1 (decl
);
10253 reconsider
= false;
10254 for (decl
= globals
; decl
; decl
= DECL_CHAIN (decl
))
10255 reconsider
|= wrapup_global_declaration_2 (decl
);
10257 while (reconsider
);
10259 for (decl
= globals
; decl
; decl
= DECL_CHAIN (decl
))
10260 check_global_declaration_1 (decl
);
10263 /* A subroutine of c_write_global_declarations Emit debug information for each
10264 of the declarations in GLOBALS. */
10267 c_write_global_declarations_2 (tree globals
)
10271 for (decl
= globals
; decl
; decl
= DECL_CHAIN (decl
))
10272 debug_hooks
->global_decl (decl
);
10275 /* Callback to collect a source_ref from a DECL. */
10278 collect_source_ref_cb (tree decl
)
10280 if (!DECL_IS_BUILTIN (decl
))
10281 collect_source_ref (LOCATION_FILE (decl_sloc (decl
, false)));
10284 /* Preserve the external declarations scope across a garbage collect. */
10285 static GTY(()) tree ext_block
;
10287 /* Collect all references relevant to SOURCE_FILE. */
10290 collect_all_refs (const char *source_file
)
10295 FOR_EACH_VEC_ELT (*all_translation_units
, i
, t
)
10296 collect_ada_nodes (BLOCK_VARS (DECL_INITIAL (t
)), source_file
);
10298 collect_ada_nodes (BLOCK_VARS (ext_block
), source_file
);
10301 /* Iterate over all global declarations and call CALLBACK. */
10304 for_each_global_decl (void (*callback
) (tree decl
))
10311 FOR_EACH_VEC_ELT (*all_translation_units
, i
, t
)
10313 decls
= DECL_INITIAL (t
);
10314 for (decl
= BLOCK_VARS (decls
); decl
; decl
= TREE_CHAIN (decl
))
10318 for (decl
= BLOCK_VARS (ext_block
); decl
; decl
= TREE_CHAIN (decl
))
10323 c_write_global_declarations (void)
10328 /* We don't want to do this if generating a PCH. */
10332 timevar_start (TV_PHASE_DEFERRED
);
10334 /* Do the Objective-C stuff. This is where all the Objective-C
10335 module stuff gets generated (symtab, class/protocol/selector
10337 if (c_dialect_objc ())
10338 objc_write_global_declarations ();
10340 /* Close the external scope. */
10341 ext_block
= pop_scope ();
10342 external_scope
= 0;
10343 gcc_assert (!current_scope
);
10345 /* Handle -fdump-ada-spec[-slim]. */
10346 if (flag_dump_ada_spec
|| flag_dump_ada_spec_slim
)
10348 /* Build a table of files to generate specs for */
10349 if (flag_dump_ada_spec_slim
)
10350 collect_source_ref (main_input_filename
);
10352 for_each_global_decl (collect_source_ref_cb
);
10354 dump_ada_specs (collect_all_refs
, NULL
);
10359 tree tmp
= BLOCK_VARS (ext_block
);
10361 FILE * stream
= dump_begin (TDI_tu
, &flags
);
10364 dump_node (tmp
, flags
& ~TDF_SLIM
, stream
);
10365 dump_end (TDI_tu
, stream
);
10369 /* Process all file scopes in this compilation, and the external_scope,
10370 through wrapup_global_declarations and check_global_declarations. */
10371 FOR_EACH_VEC_ELT (*all_translation_units
, i
, t
)
10372 c_write_global_declarations_1 (BLOCK_VARS (DECL_INITIAL (t
)));
10373 c_write_global_declarations_1 (BLOCK_VARS (ext_block
));
10375 timevar_stop (TV_PHASE_DEFERRED
);
10376 timevar_start (TV_PHASE_OPT_GEN
);
10378 /* We're done parsing; proceed to optimize and emit assembly.
10379 FIXME: shouldn't be the front end's responsibility to call this. */
10380 finalize_compilation_unit ();
10382 timevar_stop (TV_PHASE_OPT_GEN
);
10383 timevar_start (TV_PHASE_DBGINFO
);
10385 /* After cgraph has had a chance to emit everything that's going to
10386 be emitted, output debug information for globals. */
10387 if (!seen_error ())
10389 timevar_push (TV_SYMOUT
);
10390 FOR_EACH_VEC_ELT (*all_translation_units
, i
, t
)
10391 c_write_global_declarations_2 (BLOCK_VARS (DECL_INITIAL (t
)));
10392 c_write_global_declarations_2 (BLOCK_VARS (ext_block
));
10393 timevar_pop (TV_SYMOUT
);
10397 timevar_stop (TV_PHASE_DBGINFO
);
10400 /* Register reserved keyword WORD as qualifier for address space AS. */
10403 c_register_addr_space (const char *word
, addr_space_t as
)
10405 int rid
= RID_FIRST_ADDR_SPACE
+ as
;
10408 /* Address space qualifiers are only supported
10409 in C with GNU extensions enabled. */
10410 if (c_dialect_objc () || flag_no_asm
)
10413 id
= get_identifier (word
);
10414 C_SET_RID_CODE (id
, rid
);
10415 C_IS_RESERVED_WORD (id
) = 1;
10416 ridpointers
[rid
] = id
;
10419 /* Return identifier to look up for omp declare reduction. */
10422 c_omp_reduction_id (enum tree_code reduction_code
, tree reduction_id
)
10424 const char *p
= NULL
;
10425 switch (reduction_code
)
10427 case PLUS_EXPR
: p
= "+"; break;
10428 case MULT_EXPR
: p
= "*"; break;
10429 case MINUS_EXPR
: p
= "-"; break;
10430 case BIT_AND_EXPR
: p
= "&"; break;
10431 case BIT_XOR_EXPR
: p
= "^"; break;
10432 case BIT_IOR_EXPR
: p
= "|"; break;
10433 case TRUTH_ANDIF_EXPR
: p
= "&&"; break;
10434 case TRUTH_ORIF_EXPR
: p
= "||"; break;
10435 case MIN_EXPR
: p
= "min"; break;
10436 case MAX_EXPR
: p
= "max"; break;
10443 if (TREE_CODE (reduction_id
) != IDENTIFIER_NODE
)
10444 return error_mark_node
;
10445 p
= IDENTIFIER_POINTER (reduction_id
);
10448 const char prefix
[] = "omp declare reduction ";
10449 size_t lenp
= sizeof (prefix
);
10450 size_t len
= strlen (p
);
10451 char *name
= XALLOCAVEC (char, lenp
+ len
);
10452 memcpy (name
, prefix
, lenp
- 1);
10453 memcpy (name
+ lenp
- 1, p
, len
+ 1);
10454 return get_identifier (name
);
10457 /* Lookup REDUCTION_ID in the current scope, or create an artificial
10458 VAR_DECL, bind it into the current scope and return it. */
10461 c_omp_reduction_decl (tree reduction_id
)
10463 struct c_binding
*b
= I_SYMBOL_BINDING (reduction_id
);
10464 if (b
!= NULL
&& B_IN_CURRENT_SCOPE (b
))
10467 tree decl
= build_decl (BUILTINS_LOCATION
, VAR_DECL
,
10468 reduction_id
, integer_type_node
);
10469 DECL_ARTIFICIAL (decl
) = 1;
10470 DECL_EXTERNAL (decl
) = 1;
10471 TREE_STATIC (decl
) = 1;
10472 TREE_PUBLIC (decl
) = 0;
10473 bind (reduction_id
, decl
, current_scope
, true, false, BUILTINS_LOCATION
);
10477 /* Lookup REDUCTION_ID in the first scope where it has entry for TYPE. */
10480 c_omp_reduction_lookup (tree reduction_id
, tree type
)
10482 struct c_binding
*b
= I_SYMBOL_BINDING (reduction_id
);
10486 for (t
= DECL_INITIAL (b
->decl
); t
; t
= TREE_CHAIN (t
))
10487 if (comptypes (TREE_PURPOSE (t
), type
))
10488 return TREE_VALUE (t
);
10491 return error_mark_node
;
10494 /* Helper function called via walk_tree, to diagnose invalid
10495 #pragma omp declare reduction combiners or initializers. */
10498 c_check_omp_declare_reduction_r (tree
*tp
, int *, void *data
)
10500 tree
*vars
= (tree
*) data
;
10501 if (SSA_VAR_P (*tp
)
10502 && !DECL_ARTIFICIAL (*tp
)
10506 location_t loc
= DECL_SOURCE_LOCATION (vars
[0]);
10507 if (strcmp (IDENTIFIER_POINTER (DECL_NAME (vars
[0])), "omp_out") == 0)
10508 error_at (loc
, "%<#pragma omp declare reduction%> combiner refers to "
10509 "variable %qD which is not %<omp_out%> nor %<omp_in%>",
10512 error_at (loc
, "%<#pragma omp declare reduction%> initializer refers "
10513 "to variable %qD which is not %<omp_priv%> nor "
10521 #include "gt-c-c-decl.h"