1 /* Process declarations and variables for C compiler.
2 Copyright (C) 1988-2014 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
)))
2102 warned
|= warning (OPT_Wattributes
,
2103 "inline declaration of %qD follows "
2104 "declaration with attribute noinline", newdecl
);
2105 else if (DECL_DECLARED_INLINE_P (olddecl
)
2106 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl
)))
2107 warned
|= warning (OPT_Wattributes
,
2108 "declaration of %q+D with attribute "
2109 "noinline follows inline declaration ", newdecl
);
2110 else if (lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl
))
2111 && lookup_attribute ("always_inline", DECL_ATTRIBUTES (olddecl
)))
2112 warned
|= warning (OPT_Wattributes
,
2113 "declaration of %q+D with attribute "
2114 "%qs follows declaration with attribute %qs",
2115 newdecl
, "noinline", "always_inline");
2116 else if (lookup_attribute ("always_inline", DECL_ATTRIBUTES (newdecl
))
2117 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl
)))
2118 warned
|= warning (OPT_Wattributes
,
2119 "declaration of %q+D with attribute "
2120 "%qs follows declaration with attribute %qs",
2121 newdecl
, "always_inline", "noinline");
2122 else if (lookup_attribute ("cold", DECL_ATTRIBUTES (newdecl
))
2123 && lookup_attribute ("hot", DECL_ATTRIBUTES (olddecl
)))
2124 warned
|= warning (OPT_Wattributes
,
2125 "declaration of %q+D with attribute %qs follows "
2126 "declaration with attribute %qs", newdecl
, "cold",
2128 else if (lookup_attribute ("hot", DECL_ATTRIBUTES (newdecl
))
2129 && lookup_attribute ("cold", DECL_ATTRIBUTES (olddecl
)))
2130 warned
|= warning (OPT_Wattributes
,
2131 "declaration of %q+D with attribute %qs follows "
2132 "declaration with attribute %qs", newdecl
, "hot",
2135 else /* PARM_DECL, VAR_DECL */
2137 /* Redeclaration of a parameter is a constraint violation (this is
2138 not explicitly stated, but follows from C99 6.7p3 [no more than
2139 one declaration of the same identifier with no linkage in the
2140 same scope, except type tags] and 6.2.2p6 [parameters have no
2141 linkage]). We must check for a forward parameter declaration,
2142 indicated by TREE_ASM_WRITTEN on the old declaration - this is
2143 an extension, the mandatory diagnostic for which is handled by
2144 mark_forward_parm_decls. */
2146 if (TREE_CODE (newdecl
) == PARM_DECL
2147 && (!TREE_ASM_WRITTEN (olddecl
) || TREE_ASM_WRITTEN (newdecl
)))
2149 error ("redefinition of parameter %q+D", newdecl
);
2150 locate_old_decl (olddecl
);
2155 /* Optional warning for completely redundant decls. */
2156 if (!warned
&& !pedwarned
2157 && warn_redundant_decls
2158 /* Don't warn about a function declaration followed by a
2160 && !(TREE_CODE (newdecl
) == FUNCTION_DECL
2161 && DECL_INITIAL (newdecl
) && !DECL_INITIAL (olddecl
))
2162 /* Don't warn about redundant redeclarations of builtins. */
2163 && !(TREE_CODE (newdecl
) == FUNCTION_DECL
2164 && !DECL_BUILT_IN (newdecl
)
2165 && DECL_BUILT_IN (olddecl
)
2166 && !C_DECL_DECLARED_BUILTIN (olddecl
))
2167 /* Don't warn about an extern followed by a definition. */
2168 && !(DECL_EXTERNAL (olddecl
) && !DECL_EXTERNAL (newdecl
))
2169 /* Don't warn about forward parameter decls. */
2170 && !(TREE_CODE (newdecl
) == PARM_DECL
2171 && TREE_ASM_WRITTEN (olddecl
) && !TREE_ASM_WRITTEN (newdecl
))
2172 /* Don't warn about a variable definition following a declaration. */
2173 && !(TREE_CODE (newdecl
) == VAR_DECL
2174 && DECL_INITIAL (newdecl
) && !DECL_INITIAL (olddecl
)))
2176 warned
= warning (OPT_Wredundant_decls
, "redundant redeclaration of %q+D",
2180 /* Report location of previous decl/defn. */
2181 if (warned
|| pedwarned
)
2182 locate_old_decl (olddecl
);
2184 #undef DECL_EXTERN_INLINE
2189 /* Subroutine of duplicate_decls. NEWDECL has been found to be
2190 consistent with OLDDECL, but carries new information. Merge the
2191 new information into OLDDECL. This function issues no
2195 merge_decls (tree newdecl
, tree olddecl
, tree newtype
, tree oldtype
)
2197 bool new_is_definition
= (TREE_CODE (newdecl
) == FUNCTION_DECL
2198 && DECL_INITIAL (newdecl
) != 0);
2199 bool new_is_prototype
= (TREE_CODE (newdecl
) == FUNCTION_DECL
2200 && prototype_p (TREE_TYPE (newdecl
)));
2201 bool old_is_prototype
= (TREE_CODE (olddecl
) == FUNCTION_DECL
2202 && prototype_p (TREE_TYPE (olddecl
)));
2204 /* For real parm decl following a forward decl, rechain the old decl
2205 in its new location and clear TREE_ASM_WRITTEN (it's not a
2206 forward decl anymore). */
2207 if (TREE_CODE (newdecl
) == PARM_DECL
2208 && TREE_ASM_WRITTEN (olddecl
) && !TREE_ASM_WRITTEN (newdecl
))
2210 struct c_binding
*b
, **here
;
2212 for (here
= ¤t_scope
->bindings
; *here
; here
= &(*here
)->prev
)
2213 if ((*here
)->decl
== olddecl
)
2220 b
->prev
= current_scope
->bindings
;
2221 current_scope
->bindings
= b
;
2223 TREE_ASM_WRITTEN (olddecl
) = 0;
2226 DECL_ATTRIBUTES (newdecl
)
2227 = targetm
.merge_decl_attributes (olddecl
, newdecl
);
2229 /* Merge the data types specified in the two decls. */
2231 = TREE_TYPE (olddecl
)
2232 = composite_type (newtype
, oldtype
);
2234 /* Lay the type out, unless already done. */
2235 if (!comptypes (oldtype
, TREE_TYPE (newdecl
)))
2237 if (TREE_TYPE (newdecl
) != error_mark_node
)
2238 layout_type (TREE_TYPE (newdecl
));
2239 if (TREE_CODE (newdecl
) != FUNCTION_DECL
2240 && TREE_CODE (newdecl
) != TYPE_DECL
2241 && TREE_CODE (newdecl
) != CONST_DECL
)
2242 layout_decl (newdecl
, 0);
2246 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
2247 DECL_SIZE (newdecl
) = DECL_SIZE (olddecl
);
2248 DECL_SIZE_UNIT (newdecl
) = DECL_SIZE_UNIT (olddecl
);
2249 DECL_MODE (newdecl
) = DECL_MODE (olddecl
);
2250 if (DECL_ALIGN (olddecl
) > DECL_ALIGN (newdecl
))
2252 DECL_ALIGN (newdecl
) = DECL_ALIGN (olddecl
);
2253 DECL_USER_ALIGN (newdecl
) |= DECL_USER_ALIGN (olddecl
);
2257 /* Keep the old rtl since we can safely use it. */
2258 if (HAS_RTL_P (olddecl
))
2259 COPY_DECL_RTL (olddecl
, newdecl
);
2261 /* Merge the type qualifiers. */
2262 if (TREE_READONLY (newdecl
))
2263 TREE_READONLY (olddecl
) = 1;
2265 if (TREE_THIS_VOLATILE (newdecl
))
2266 TREE_THIS_VOLATILE (olddecl
) = 1;
2268 /* Merge deprecatedness. */
2269 if (TREE_DEPRECATED (newdecl
))
2270 TREE_DEPRECATED (olddecl
) = 1;
2272 /* If a decl is in a system header and the other isn't, keep the one on the
2273 system header. Otherwise, keep source location of definition rather than
2274 declaration and of prototype rather than non-prototype unless that
2275 prototype is built-in. */
2276 if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl
), TS_DECL_WITH_VIS
)
2277 && DECL_IN_SYSTEM_HEADER (olddecl
)
2278 && !DECL_IN_SYSTEM_HEADER (newdecl
) )
2279 DECL_SOURCE_LOCATION (newdecl
) = DECL_SOURCE_LOCATION (olddecl
);
2280 else if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl
), TS_DECL_WITH_VIS
)
2281 && DECL_IN_SYSTEM_HEADER (newdecl
)
2282 && !DECL_IN_SYSTEM_HEADER (olddecl
))
2283 DECL_SOURCE_LOCATION (olddecl
) = DECL_SOURCE_LOCATION (newdecl
);
2284 else if ((DECL_INITIAL (newdecl
) == 0 && DECL_INITIAL (olddecl
) != 0)
2285 || (old_is_prototype
&& !new_is_prototype
2286 && !C_DECL_BUILTIN_PROTOTYPE (olddecl
)))
2287 DECL_SOURCE_LOCATION (newdecl
) = DECL_SOURCE_LOCATION (olddecl
);
2289 /* Merge the initialization information. */
2290 if (DECL_INITIAL (newdecl
) == 0)
2291 DECL_INITIAL (newdecl
) = DECL_INITIAL (olddecl
);
2293 /* Merge the threadprivate attribute. */
2294 if (TREE_CODE (olddecl
) == VAR_DECL
&& C_DECL_THREADPRIVATE_P (olddecl
))
2296 DECL_TLS_MODEL (newdecl
) = DECL_TLS_MODEL (olddecl
);
2297 C_DECL_THREADPRIVATE_P (newdecl
) = 1;
2300 if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl
), TS_DECL_WITH_VIS
))
2302 /* Merge the section attribute.
2303 We want to issue an error if the sections conflict but that
2304 must be done later in decl_attributes since we are called
2305 before attributes are assigned. */
2306 if (DECL_SECTION_NAME (newdecl
) == NULL_TREE
)
2307 DECL_SECTION_NAME (newdecl
) = DECL_SECTION_NAME (olddecl
);
2309 /* Copy the assembler name.
2310 Currently, it can only be defined in the prototype. */
2311 COPY_DECL_ASSEMBLER_NAME (olddecl
, newdecl
);
2313 /* Use visibility of whichever declaration had it specified */
2314 if (DECL_VISIBILITY_SPECIFIED (olddecl
))
2316 DECL_VISIBILITY (newdecl
) = DECL_VISIBILITY (olddecl
);
2317 DECL_VISIBILITY_SPECIFIED (newdecl
) = 1;
2320 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2322 DECL_STATIC_CONSTRUCTOR(newdecl
) |= DECL_STATIC_CONSTRUCTOR(olddecl
);
2323 DECL_STATIC_DESTRUCTOR (newdecl
) |= DECL_STATIC_DESTRUCTOR (olddecl
);
2324 DECL_NO_LIMIT_STACK (newdecl
) |= DECL_NO_LIMIT_STACK (olddecl
);
2325 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl
)
2326 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl
);
2327 TREE_THIS_VOLATILE (newdecl
) |= TREE_THIS_VOLATILE (olddecl
);
2328 DECL_IS_MALLOC (newdecl
) |= DECL_IS_MALLOC (olddecl
);
2329 DECL_IS_OPERATOR_NEW (newdecl
) |= DECL_IS_OPERATOR_NEW (olddecl
);
2330 TREE_READONLY (newdecl
) |= TREE_READONLY (olddecl
);
2331 DECL_PURE_P (newdecl
) |= DECL_PURE_P (olddecl
);
2332 DECL_IS_NOVOPS (newdecl
) |= DECL_IS_NOVOPS (olddecl
);
2335 /* Merge the storage class information. */
2336 merge_weak (newdecl
, olddecl
);
2338 /* For functions, static overrides non-static. */
2339 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2341 TREE_PUBLIC (newdecl
) &= TREE_PUBLIC (olddecl
);
2342 /* This is since we don't automatically
2343 copy the attributes of NEWDECL into OLDDECL. */
2344 TREE_PUBLIC (olddecl
) = TREE_PUBLIC (newdecl
);
2345 /* If this clears `static', clear it in the identifier too. */
2346 if (!TREE_PUBLIC (olddecl
))
2347 TREE_PUBLIC (DECL_NAME (olddecl
)) = 0;
2351 /* In c99, 'extern' declaration before (or after) 'inline' means this
2352 function is not DECL_EXTERNAL, unless 'gnu_inline' attribute
2354 if (TREE_CODE (newdecl
) == FUNCTION_DECL
2355 && !flag_gnu89_inline
2356 && (DECL_DECLARED_INLINE_P (newdecl
)
2357 || DECL_DECLARED_INLINE_P (olddecl
))
2358 && (!DECL_DECLARED_INLINE_P (newdecl
)
2359 || !DECL_DECLARED_INLINE_P (olddecl
)
2360 || !DECL_EXTERNAL (olddecl
))
2361 && DECL_EXTERNAL (newdecl
)
2362 && !lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (newdecl
))
2363 && !current_function_decl
)
2364 DECL_EXTERNAL (newdecl
) = 0;
2366 /* An inline definition following a static declaration is not
2368 if (new_is_definition
2369 && (DECL_DECLARED_INLINE_P (newdecl
)
2370 || DECL_DECLARED_INLINE_P (olddecl
))
2371 && !TREE_PUBLIC (olddecl
))
2372 DECL_EXTERNAL (newdecl
) = 0;
2374 if (DECL_EXTERNAL (newdecl
))
2376 TREE_STATIC (newdecl
) = TREE_STATIC (olddecl
);
2377 DECL_EXTERNAL (newdecl
) = DECL_EXTERNAL (olddecl
);
2379 /* An extern decl does not override previous storage class. */
2380 TREE_PUBLIC (newdecl
) = TREE_PUBLIC (olddecl
);
2381 if (!DECL_EXTERNAL (newdecl
))
2383 DECL_CONTEXT (newdecl
) = DECL_CONTEXT (olddecl
);
2384 DECL_COMMON (newdecl
) = DECL_COMMON (olddecl
);
2389 TREE_STATIC (olddecl
) = TREE_STATIC (newdecl
);
2390 TREE_PUBLIC (olddecl
) = TREE_PUBLIC (newdecl
);
2393 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2395 /* If we're redefining a function previously defined as extern
2396 inline, make sure we emit debug info for the inline before we
2397 throw it away, in case it was inlined into a function that
2398 hasn't been written out yet. */
2399 if (new_is_definition
&& DECL_INITIAL (olddecl
))
2400 /* The new defn must not be inline. */
2401 DECL_UNINLINABLE (newdecl
) = 1;
2404 /* If either decl says `inline', this fn is inline, unless
2405 its definition was passed already. */
2406 if (DECL_DECLARED_INLINE_P (newdecl
)
2407 || DECL_DECLARED_INLINE_P (olddecl
))
2408 DECL_DECLARED_INLINE_P (newdecl
) = 1;
2410 DECL_UNINLINABLE (newdecl
) = DECL_UNINLINABLE (olddecl
)
2411 = (DECL_UNINLINABLE (newdecl
) || DECL_UNINLINABLE (olddecl
));
2413 DECL_DISREGARD_INLINE_LIMITS (newdecl
)
2414 = DECL_DISREGARD_INLINE_LIMITS (olddecl
)
2415 = (DECL_DISREGARD_INLINE_LIMITS (newdecl
)
2416 || DECL_DISREGARD_INLINE_LIMITS (olddecl
));
2419 if (DECL_BUILT_IN (olddecl
))
2421 /* If redeclaring a builtin function, it stays built in.
2422 But it gets tagged as having been declared. */
2423 DECL_BUILT_IN_CLASS (newdecl
) = DECL_BUILT_IN_CLASS (olddecl
);
2424 DECL_FUNCTION_CODE (newdecl
) = DECL_FUNCTION_CODE (olddecl
);
2425 C_DECL_DECLARED_BUILTIN (newdecl
) = 1;
2426 if (new_is_prototype
)
2428 C_DECL_BUILTIN_PROTOTYPE (newdecl
) = 0;
2429 if (DECL_BUILT_IN_CLASS (newdecl
) == BUILT_IN_NORMAL
)
2431 enum built_in_function fncode
= DECL_FUNCTION_CODE (newdecl
);
2434 /* If a compatible prototype of these builtin functions
2435 is seen, assume the runtime implements it with the
2436 expected semantics. */
2437 case BUILT_IN_STPCPY
:
2438 if (builtin_decl_explicit_p (fncode
))
2439 set_builtin_decl_implicit_p (fncode
, true);
2447 C_DECL_BUILTIN_PROTOTYPE (newdecl
)
2448 = C_DECL_BUILTIN_PROTOTYPE (olddecl
);
2451 /* Preserve function specific target and optimization options */
2452 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl
)
2453 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl
))
2454 DECL_FUNCTION_SPECIFIC_TARGET (newdecl
)
2455 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl
);
2457 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl
)
2458 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl
))
2459 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl
)
2460 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl
);
2462 /* Also preserve various other info from the definition. */
2463 if (!new_is_definition
)
2466 DECL_RESULT (newdecl
) = DECL_RESULT (olddecl
);
2467 DECL_INITIAL (newdecl
) = DECL_INITIAL (olddecl
);
2468 DECL_STRUCT_FUNCTION (newdecl
) = DECL_STRUCT_FUNCTION (olddecl
);
2469 DECL_SAVED_TREE (newdecl
) = DECL_SAVED_TREE (olddecl
);
2470 DECL_ARGUMENTS (newdecl
) = copy_list (DECL_ARGUMENTS (olddecl
));
2471 for (t
= DECL_ARGUMENTS (newdecl
); t
; t
= DECL_CHAIN (t
))
2472 DECL_CONTEXT (t
) = newdecl
;
2474 /* See if we've got a function to instantiate from. */
2475 if (DECL_SAVED_TREE (olddecl
))
2476 DECL_ABSTRACT_ORIGIN (newdecl
)
2477 = DECL_ABSTRACT_ORIGIN (olddecl
);
2481 /* Merge the USED information. */
2482 if (TREE_USED (olddecl
))
2483 TREE_USED (newdecl
) = 1;
2484 else if (TREE_USED (newdecl
))
2485 TREE_USED (olddecl
) = 1;
2486 if (TREE_CODE (olddecl
) == VAR_DECL
|| TREE_CODE (olddecl
) == PARM_DECL
)
2487 DECL_READ_P (newdecl
) |= DECL_READ_P (olddecl
);
2488 if (DECL_PRESERVE_P (olddecl
))
2489 DECL_PRESERVE_P (newdecl
) = 1;
2490 else if (DECL_PRESERVE_P (newdecl
))
2491 DECL_PRESERVE_P (olddecl
) = 1;
2493 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
2494 But preserve OLDDECL's DECL_UID, DECL_CONTEXT and
2495 DECL_ARGUMENTS (if appropriate). */
2497 unsigned olddecl_uid
= DECL_UID (olddecl
);
2498 tree olddecl_context
= DECL_CONTEXT (olddecl
);
2499 tree olddecl_arguments
= NULL
;
2500 if (TREE_CODE (olddecl
) == FUNCTION_DECL
)
2501 olddecl_arguments
= DECL_ARGUMENTS (olddecl
);
2503 memcpy ((char *) olddecl
+ sizeof (struct tree_common
),
2504 (char *) newdecl
+ sizeof (struct tree_common
),
2505 sizeof (struct tree_decl_common
) - sizeof (struct tree_common
));
2506 DECL_USER_ALIGN (olddecl
) = DECL_USER_ALIGN (newdecl
);
2507 switch (TREE_CODE (olddecl
))
2517 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
2518 (char *) newdecl
+ sizeof (struct tree_decl_common
),
2519 tree_code_size (TREE_CODE (olddecl
)) - sizeof (struct tree_decl_common
));
2524 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
2525 (char *) newdecl
+ sizeof (struct tree_decl_common
),
2526 sizeof (struct tree_decl_non_common
) - sizeof (struct tree_decl_common
));
2528 DECL_UID (olddecl
) = olddecl_uid
;
2529 DECL_CONTEXT (olddecl
) = olddecl_context
;
2530 if (TREE_CODE (olddecl
) == FUNCTION_DECL
)
2531 DECL_ARGUMENTS (olddecl
) = olddecl_arguments
;
2534 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2535 so that encode_section_info has a chance to look at the new decl
2536 flags and attributes. */
2537 if (DECL_RTL_SET_P (olddecl
)
2538 && (TREE_CODE (olddecl
) == FUNCTION_DECL
2539 || (TREE_CODE (olddecl
) == VAR_DECL
2540 && TREE_STATIC (olddecl
))))
2541 make_decl_rtl (olddecl
);
2544 /* Handle when a new declaration NEWDECL has the same name as an old
2545 one OLDDECL in the same binding contour. Prints an error message
2548 If safely possible, alter OLDDECL to look like NEWDECL, and return
2549 true. Otherwise, return false. */
2552 duplicate_decls (tree newdecl
, tree olddecl
)
2554 tree newtype
= NULL
, oldtype
= NULL
;
2556 if (!diagnose_mismatched_decls (newdecl
, olddecl
, &newtype
, &oldtype
))
2558 /* Avoid `unused variable' and other warnings for OLDDECL. */
2559 TREE_NO_WARNING (olddecl
) = 1;
2563 merge_decls (newdecl
, olddecl
, newtype
, oldtype
);
2568 /* Check whether decl-node NEW_DECL shadows an existing declaration. */
2570 warn_if_shadowing (tree new_decl
)
2572 struct c_binding
*b
;
2574 /* Shadow warnings wanted? */
2576 /* No shadow warnings for internally generated vars. */
2577 || DECL_IS_BUILTIN (new_decl
)
2578 /* No shadow warnings for vars made for inlining. */
2579 || DECL_FROM_INLINE (new_decl
))
2582 /* Is anything being shadowed? Invisible decls do not count. */
2583 for (b
= I_SYMBOL_BINDING (DECL_NAME (new_decl
)); b
; b
= b
->shadowed
)
2584 if (b
->decl
&& b
->decl
!= new_decl
&& !b
->invisible
2585 && (b
->decl
== error_mark_node
2586 || diagnostic_report_warnings_p (global_dc
,
2587 DECL_SOURCE_LOCATION (b
->decl
))))
2589 tree old_decl
= b
->decl
;
2591 if (old_decl
== error_mark_node
)
2593 warning (OPT_Wshadow
, "declaration of %q+D shadows previous "
2594 "non-variable", new_decl
);
2597 else if (TREE_CODE (old_decl
) == PARM_DECL
)
2598 warning (OPT_Wshadow
, "declaration of %q+D shadows a parameter",
2600 else if (DECL_FILE_SCOPE_P (old_decl
))
2602 /* Do not warn if a variable shadows a function, unless
2603 the variable is a function or a pointer-to-function. */
2604 if (TREE_CODE (old_decl
) == FUNCTION_DECL
2605 && TREE_CODE (new_decl
) != FUNCTION_DECL
2606 && !FUNCTION_POINTER_TYPE_P (TREE_TYPE (new_decl
)))
2609 warning_at (DECL_SOURCE_LOCATION (new_decl
), OPT_Wshadow
,
2610 "declaration of %qD shadows a global declaration",
2613 else if (TREE_CODE (old_decl
) == FUNCTION_DECL
2614 && DECL_BUILT_IN (old_decl
))
2616 warning (OPT_Wshadow
, "declaration of %q+D shadows "
2617 "a built-in function", new_decl
);
2621 warning (OPT_Wshadow
, "declaration of %q+D shadows a previous local",
2624 warning_at (DECL_SOURCE_LOCATION (old_decl
), OPT_Wshadow
,
2625 "shadowed declaration is here");
2631 /* Record a decl-node X as belonging to the current lexical scope.
2632 Check for errors (such as an incompatible declaration for the same
2633 name already seen in the same scope).
2635 Returns either X or an old decl for the same name.
2636 If an old decl is returned, it may have been smashed
2637 to agree with what X says. */
2642 tree name
= DECL_NAME (x
);
2643 struct c_scope
*scope
= current_scope
;
2644 struct c_binding
*b
;
2645 bool nested
= false;
2646 location_t locus
= DECL_SOURCE_LOCATION (x
);
2648 /* Must set DECL_CONTEXT for everything not at file scope or
2649 DECL_FILE_SCOPE_P won't work. Local externs don't count
2650 unless they have initializers (which generate code). */
2651 if (current_function_decl
2652 && ((TREE_CODE (x
) != FUNCTION_DECL
&& TREE_CODE (x
) != VAR_DECL
)
2653 || DECL_INITIAL (x
) || !DECL_EXTERNAL (x
)))
2654 DECL_CONTEXT (x
) = current_function_decl
;
2656 /* Anonymous decls are just inserted in the scope. */
2659 bind (name
, x
, scope
, /*invisible=*/false, /*nested=*/false,
2664 /* First, see if there is another declaration with the same name in
2665 the current scope. If there is, duplicate_decls may do all the
2666 work for us. If duplicate_decls returns false, that indicates
2667 two incompatible decls in the same scope; we are to silently
2668 replace the old one (duplicate_decls has issued all appropriate
2669 diagnostics). In particular, we should not consider possible
2670 duplicates in the external scope, or shadowing. */
2671 b
= I_SYMBOL_BINDING (name
);
2672 if (b
&& B_IN_SCOPE (b
, scope
))
2674 struct c_binding
*b_ext
, *b_use
;
2675 tree type
= TREE_TYPE (x
);
2676 tree visdecl
= b
->decl
;
2677 tree vistype
= TREE_TYPE (visdecl
);
2678 if (TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
2679 && COMPLETE_TYPE_P (TREE_TYPE (x
)))
2680 b
->inner_comp
= false;
2683 /* If this is an external linkage declaration, we should check
2684 for compatibility with the type in the external scope before
2685 setting the type at this scope based on the visible
2686 information only. */
2687 if (TREE_PUBLIC (x
) && TREE_PUBLIC (visdecl
))
2689 while (b_ext
&& !B_IN_EXTERNAL_SCOPE (b_ext
))
2690 b_ext
= b_ext
->shadowed
;
2695 TREE_TYPE (b_use
->decl
) = b_use
->u
.type
;
2698 if (duplicate_decls (x
, b_use
->decl
))
2702 /* Save the updated type in the external scope and
2703 restore the proper type for this scope. */
2705 if (comptypes (vistype
, type
))
2706 thistype
= composite_type (vistype
, type
);
2708 thistype
= TREE_TYPE (b_use
->decl
);
2709 b_use
->u
.type
= TREE_TYPE (b_use
->decl
);
2710 if (TREE_CODE (b_use
->decl
) == FUNCTION_DECL
2711 && DECL_BUILT_IN (b_use
->decl
))
2713 = build_type_attribute_variant (thistype
,
2716 TREE_TYPE (b_use
->decl
) = thistype
;
2721 goto skip_external_and_shadow_checks
;
2724 /* All declarations with external linkage, and all external
2725 references, go in the external scope, no matter what scope is
2726 current. However, the binding in that scope is ignored for
2727 purposes of normal name lookup. A separate binding structure is
2728 created in the requested scope; this governs the normal
2729 visibility of the symbol.
2731 The binding in the externals scope is used exclusively for
2732 detecting duplicate declarations of the same object, no matter
2733 what scope they are in; this is what we do here. (C99 6.2.7p2:
2734 All declarations that refer to the same object or function shall
2735 have compatible type; otherwise, the behavior is undefined.) */
2736 if (DECL_EXTERNAL (x
) || scope
== file_scope
)
2738 tree type
= TREE_TYPE (x
);
2741 bool type_saved
= false;
2742 if (b
&& !B_IN_EXTERNAL_SCOPE (b
)
2743 && (TREE_CODE (b
->decl
) == FUNCTION_DECL
2744 || TREE_CODE (b
->decl
) == VAR_DECL
)
2745 && DECL_FILE_SCOPE_P (b
->decl
))
2748 vistype
= TREE_TYPE (visdecl
);
2750 if (scope
!= file_scope
2751 && !DECL_IN_SYSTEM_HEADER (x
))
2752 warning (OPT_Wnested_externs
, "nested extern declaration of %qD", x
);
2754 while (b
&& !B_IN_EXTERNAL_SCOPE (b
))
2756 /* If this decl might be modified, save its type. This is
2757 done here rather than when the decl is first bound
2758 because the type may change after first binding, through
2759 being completed or through attributes being added. If we
2760 encounter multiple such decls, only the first should have
2761 its type saved; the others will already have had their
2762 proper types saved and the types will not have changed as
2763 their scopes will not have been re-entered. */
2764 if (DECL_P (b
->decl
) && DECL_FILE_SCOPE_P (b
->decl
) && !type_saved
)
2766 b
->u
.type
= TREE_TYPE (b
->decl
);
2769 if (B_IN_FILE_SCOPE (b
)
2770 && TREE_CODE (b
->decl
) == VAR_DECL
2771 && TREE_STATIC (b
->decl
)
2772 && TREE_CODE (TREE_TYPE (b
->decl
)) == ARRAY_TYPE
2773 && !TYPE_DOMAIN (TREE_TYPE (b
->decl
))
2774 && TREE_CODE (type
) == ARRAY_TYPE
2775 && TYPE_DOMAIN (type
)
2776 && TYPE_MAX_VALUE (TYPE_DOMAIN (type
))
2777 && !integer_zerop (TYPE_MAX_VALUE (TYPE_DOMAIN (type
))))
2779 /* Array type completed in inner scope, which should be
2780 diagnosed if the completion does not have size 1 and
2781 it does not get completed in the file scope. */
2782 b
->inner_comp
= true;
2787 /* If a matching external declaration has been found, set its
2788 type to the composite of all the types of that declaration.
2789 After the consistency checks, it will be reset to the
2790 composite of the visible types only. */
2791 if (b
&& (TREE_PUBLIC (x
) || same_translation_unit_p (x
, b
->decl
))
2793 TREE_TYPE (b
->decl
) = b
->u
.type
;
2795 /* The point of the same_translation_unit_p check here is,
2796 we want to detect a duplicate decl for a construct like
2797 foo() { extern bar(); } ... static bar(); but not if
2798 they are in different translation units. In any case,
2799 the static does not go in the externals scope. */
2801 && (TREE_PUBLIC (x
) || same_translation_unit_p (x
, b
->decl
))
2802 && duplicate_decls (x
, b
->decl
))
2807 if (comptypes (vistype
, type
))
2808 thistype
= composite_type (vistype
, type
);
2810 thistype
= TREE_TYPE (b
->decl
);
2814 b
->u
.type
= TREE_TYPE (b
->decl
);
2815 if (TREE_CODE (b
->decl
) == FUNCTION_DECL
&& DECL_BUILT_IN (b
->decl
))
2817 = build_type_attribute_variant (thistype
,
2818 TYPE_ATTRIBUTES (b
->u
.type
));
2819 TREE_TYPE (b
->decl
) = thistype
;
2820 bind (name
, b
->decl
, scope
, /*invisible=*/false, /*nested=*/true,
2824 else if (TREE_PUBLIC (x
))
2826 if (visdecl
&& !b
&& duplicate_decls (x
, visdecl
))
2828 /* An external declaration at block scope referring to a
2829 visible entity with internal linkage. The composite
2830 type will already be correct for this scope, so we
2831 just need to fall through to make the declaration in
2838 bind (name
, x
, external_scope
, /*invisible=*/true,
2839 /*nested=*/false, locus
);
2845 if (TREE_CODE (x
) != PARM_DECL
)
2846 warn_if_shadowing (x
);
2848 skip_external_and_shadow_checks
:
2849 if (TREE_CODE (x
) == TYPE_DECL
)
2851 /* So this is a typedef, set its underlying type. */
2852 set_underlying_type (x
);
2854 /* If X is a typedef defined in the current function, record it
2855 for the purpose of implementing the -Wunused-local-typedefs
2857 record_locally_defined_typedef (x
);
2860 bind (name
, x
, scope
, /*invisible=*/false, nested
, locus
);
2862 /* If x's type is incomplete because it's based on a
2863 structure or union which has not yet been fully declared,
2864 attach it to that structure or union type, so we can go
2865 back and complete the variable declaration later, if the
2866 structure or union gets fully declared.
2868 If the input is erroneous, we can have error_mark in the type
2869 slot (e.g. "f(void a, ...)") - that doesn't count as an
2871 if (TREE_TYPE (x
) != error_mark_node
2872 && !COMPLETE_TYPE_P (TREE_TYPE (x
)))
2874 tree element
= TREE_TYPE (x
);
2876 while (TREE_CODE (element
) == ARRAY_TYPE
)
2877 element
= TREE_TYPE (element
);
2878 element
= TYPE_MAIN_VARIANT (element
);
2880 if ((TREE_CODE (element
) == RECORD_TYPE
2881 || TREE_CODE (element
) == UNION_TYPE
)
2882 && (TREE_CODE (x
) != TYPE_DECL
2883 || TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
)
2884 && !COMPLETE_TYPE_P (element
))
2885 C_TYPE_INCOMPLETE_VARS (element
)
2886 = tree_cons (NULL_TREE
, x
, C_TYPE_INCOMPLETE_VARS (element
));
2891 /* Record X as belonging to file scope.
2892 This is used only internally by the Objective-C front end,
2893 and is limited to its needs. duplicate_decls is not called;
2894 if there is any preexisting decl for this identifier, it is an ICE. */
2897 pushdecl_top_level (tree x
)
2900 bool nested
= false;
2901 gcc_assert (TREE_CODE (x
) == VAR_DECL
|| TREE_CODE (x
) == CONST_DECL
);
2903 name
= DECL_NAME (x
);
2905 gcc_assert (TREE_CODE (x
) == CONST_DECL
|| !I_SYMBOL_BINDING (name
));
2907 if (TREE_PUBLIC (x
))
2909 bind (name
, x
, external_scope
, /*invisible=*/true, /*nested=*/false,
2914 bind (name
, x
, file_scope
, /*invisible=*/false, nested
, UNKNOWN_LOCATION
);
2920 implicit_decl_warning (tree id
, tree olddecl
)
2922 if (warn_implicit_function_declaration
)
2927 warned
= pedwarn (input_location
, OPT_Wimplicit_function_declaration
,
2928 "implicit declaration of function %qE", id
);
2930 warned
= warning (OPT_Wimplicit_function_declaration
,
2931 G_("implicit declaration of function %qE"), id
);
2932 if (olddecl
&& warned
)
2933 locate_old_decl (olddecl
);
2937 /* Generate an implicit declaration for identifier FUNCTIONID at LOC as a
2938 function of type int (). */
2941 implicitly_declare (location_t loc
, tree functionid
)
2943 struct c_binding
*b
;
2947 for (b
= I_SYMBOL_BINDING (functionid
); b
; b
= b
->shadowed
)
2949 if (B_IN_SCOPE (b
, external_scope
))
2958 if (decl
== error_mark_node
)
2961 /* FIXME: Objective-C has weird not-really-builtin functions
2962 which are supposed to be visible automatically. They wind up
2963 in the external scope because they're pushed before the file
2964 scope gets created. Catch this here and rebind them into the
2966 if (!DECL_BUILT_IN (decl
) && DECL_IS_BUILTIN (decl
))
2968 bind (functionid
, decl
, file_scope
,
2969 /*invisible=*/false, /*nested=*/true,
2970 DECL_SOURCE_LOCATION (decl
));
2975 tree newtype
= default_function_type
;
2977 TREE_TYPE (decl
) = b
->u
.type
;
2978 /* Implicit declaration of a function already declared
2979 (somehow) in a different scope, or as a built-in.
2980 If this is the first time this has happened, warn;
2981 then recycle the old declaration but with the new type. */
2982 if (!C_DECL_IMPLICIT (decl
))
2984 implicit_decl_warning (functionid
, decl
);
2985 C_DECL_IMPLICIT (decl
) = 1;
2987 if (DECL_BUILT_IN (decl
))
2989 newtype
= build_type_attribute_variant (newtype
,
2991 (TREE_TYPE (decl
)));
2992 if (!comptypes (newtype
, TREE_TYPE (decl
)))
2994 warning_at (loc
, 0, "incompatible implicit declaration of "
2995 "built-in function %qD", decl
);
2996 newtype
= TREE_TYPE (decl
);
3001 if (!comptypes (newtype
, TREE_TYPE (decl
)))
3003 error_at (loc
, "incompatible implicit declaration of function %qD", decl
);
3004 locate_old_decl (decl
);
3007 b
->u
.type
= TREE_TYPE (decl
);
3008 TREE_TYPE (decl
) = newtype
;
3009 bind (functionid
, decl
, current_scope
,
3010 /*invisible=*/false, /*nested=*/true,
3011 DECL_SOURCE_LOCATION (decl
));
3016 /* Not seen before. */
3017 decl
= build_decl (loc
, FUNCTION_DECL
, functionid
, default_function_type
);
3018 DECL_EXTERNAL (decl
) = 1;
3019 TREE_PUBLIC (decl
) = 1;
3020 C_DECL_IMPLICIT (decl
) = 1;
3021 implicit_decl_warning (functionid
, 0);
3022 asmspec_tree
= maybe_apply_renaming_pragma (decl
, /*asmname=*/NULL
);
3024 set_user_assembler_name (decl
, TREE_STRING_POINTER (asmspec_tree
));
3026 /* C89 says implicit declarations are in the innermost block.
3027 So we record the decl in the standard fashion. */
3028 decl
= pushdecl (decl
);
3030 /* No need to call objc_check_decl here - it's a function type. */
3031 rest_of_decl_compilation (decl
, 0, 0);
3033 /* Write a record describing this implicit function declaration
3034 to the prototypes file (if requested). */
3035 gen_aux_info_record (decl
, 0, 1, 0);
3037 /* Possibly apply some default attributes to this implicit declaration. */
3038 decl_attributes (&decl
, NULL_TREE
, 0);
3043 /* Issue an error message for a reference to an undeclared variable
3044 ID, including a reference to a builtin outside of function-call
3045 context. Establish a binding of the identifier to error_mark_node
3046 in an appropriate scope, which will suppress further errors for the
3047 same identifier. The error message should be given location LOC. */
3049 undeclared_variable (location_t loc
, tree id
)
3051 static bool already
= false;
3052 struct c_scope
*scope
;
3054 if (current_function_decl
== 0)
3056 error_at (loc
, "%qE undeclared here (not in a function)", id
);
3057 scope
= current_scope
;
3061 if (!objc_diagnose_private_ivar (id
))
3062 error_at (loc
, "%qE undeclared (first use in this function)", id
);
3065 inform (loc
, "each undeclared identifier is reported only"
3066 " once for each function it appears in");
3070 /* If we are parsing old-style parameter decls, current_function_decl
3071 will be nonnull but current_function_scope will be null. */
3072 scope
= current_function_scope
? current_function_scope
: current_scope
;
3074 bind (id
, error_mark_node
, scope
, /*invisible=*/false, /*nested=*/false,
3078 /* Subroutine of lookup_label, declare_label, define_label: construct a
3079 LABEL_DECL with all the proper frills. Also create a struct
3080 c_label_vars initialized for the current scope. */
3083 make_label (location_t location
, tree name
, bool defining
,
3084 struct c_label_vars
**p_label_vars
)
3086 tree label
= build_decl (location
, LABEL_DECL
, name
, void_type_node
);
3087 struct c_label_vars
*label_vars
;
3089 DECL_CONTEXT (label
) = current_function_decl
;
3090 DECL_MODE (label
) = VOIDmode
;
3092 label_vars
= ggc_alloc_c_label_vars ();
3093 label_vars
->shadowed
= NULL
;
3094 set_spot_bindings (&label_vars
->label_bindings
, defining
);
3095 label_vars
->decls_in_scope
= make_tree_vector ();
3096 label_vars
->gotos
= NULL
;
3097 *p_label_vars
= label_vars
;
3102 /* Get the LABEL_DECL corresponding to identifier NAME as a label.
3103 Create one if none exists so far for the current function.
3104 This is called when a label is used in a goto expression or
3105 has its address taken. */
3108 lookup_label (tree name
)
3111 struct c_label_vars
*label_vars
;
3113 if (current_function_scope
== 0)
3115 error ("label %qE referenced outside of any function", name
);
3119 /* Use a label already defined or ref'd with this name, but not if
3120 it is inherited from a containing function and wasn't declared
3122 label
= I_LABEL_DECL (name
);
3123 if (label
&& (DECL_CONTEXT (label
) == current_function_decl
3124 || C_DECLARED_LABEL_FLAG (label
)))
3126 /* If the label has only been declared, update its apparent
3127 location to point here, for better diagnostics if it
3128 turns out not to have been defined. */
3129 if (DECL_INITIAL (label
) == NULL_TREE
)
3130 DECL_SOURCE_LOCATION (label
) = input_location
;
3134 /* No label binding for that identifier; make one. */
3135 label
= make_label (input_location
, name
, false, &label_vars
);
3137 /* Ordinary labels go in the current function scope. */
3138 bind_label (name
, label
, current_function_scope
, label_vars
);
3143 /* Issue a warning about DECL for a goto statement at GOTO_LOC going
3147 warn_about_goto (location_t goto_loc
, tree label
, tree decl
)
3149 if (variably_modified_type_p (TREE_TYPE (decl
), NULL_TREE
))
3151 "jump into scope of identifier with variably modified type");
3153 warning_at (goto_loc
, OPT_Wjump_misses_init
,
3154 "jump skips variable initialization");
3155 inform (DECL_SOURCE_LOCATION (label
), "label %qD defined here", label
);
3156 inform (DECL_SOURCE_LOCATION (decl
), "%qD declared here", decl
);
3159 /* Look up a label because of a goto statement. This is like
3160 lookup_label, but also issues any appropriate warnings. */
3163 lookup_label_for_goto (location_t loc
, tree name
)
3166 struct c_label_vars
*label_vars
;
3170 label
= lookup_label (name
);
3171 if (label
== NULL_TREE
)
3174 /* If we are jumping to a different function, we can't issue any
3176 if (DECL_CONTEXT (label
) != current_function_decl
)
3178 gcc_assert (C_DECLARED_LABEL_FLAG (label
));
3182 label_vars
= I_LABEL_BINDING (name
)->u
.label
;
3184 /* If the label has not yet been defined, then push this goto on a
3185 list for possible later warnings. */
3186 if (label_vars
->label_bindings
.scope
== NULL
)
3188 struct c_goto_bindings
*g
;
3190 g
= ggc_alloc_c_goto_bindings ();
3192 set_spot_bindings (&g
->goto_bindings
, true);
3193 vec_safe_push (label_vars
->gotos
, g
);
3197 /* If there are any decls in label_vars->decls_in_scope, then this
3198 goto has missed the declaration of the decl. This happens for a
3204 Issue a warning or error. */
3205 FOR_EACH_VEC_SAFE_ELT (label_vars
->decls_in_scope
, ix
, decl
)
3206 warn_about_goto (loc
, label
, decl
);
3208 if (label_vars
->label_bindings
.left_stmt_expr
)
3210 error_at (loc
, "jump into statement expression");
3211 inform (DECL_SOURCE_LOCATION (label
), "label %qD defined here", label
);
3217 /* Make a label named NAME in the current function, shadowing silently
3218 any that may be inherited from containing functions or containing
3219 scopes. This is called for __label__ declarations. */
3222 declare_label (tree name
)
3224 struct c_binding
*b
= I_LABEL_BINDING (name
);
3226 struct c_label_vars
*label_vars
;
3228 /* Check to make sure that the label hasn't already been declared
3230 if (b
&& B_IN_CURRENT_SCOPE (b
))
3232 error ("duplicate label declaration %qE", name
);
3233 locate_old_decl (b
->decl
);
3235 /* Just use the previous declaration. */
3239 label
= make_label (input_location
, name
, false, &label_vars
);
3240 C_DECLARED_LABEL_FLAG (label
) = 1;
3242 /* Declared labels go in the current scope. */
3243 bind_label (name
, label
, current_scope
, label_vars
);
3248 /* When we define a label, issue any appropriate warnings if there are
3249 any gotos earlier in the function which jump to this label. */
3252 check_earlier_gotos (tree label
, struct c_label_vars
* label_vars
)
3255 struct c_goto_bindings
*g
;
3257 FOR_EACH_VEC_SAFE_ELT (label_vars
->gotos
, ix
, g
)
3259 struct c_binding
*b
;
3260 struct c_scope
*scope
;
3262 /* We have a goto to this label. The goto is going forward. In
3263 g->scope, the goto is going to skip any binding which was
3264 defined after g->bindings_in_scope. */
3265 if (g
->goto_bindings
.scope
->has_jump_unsafe_decl
)
3267 for (b
= g
->goto_bindings
.scope
->bindings
;
3268 b
!= g
->goto_bindings
.bindings_in_scope
;
3271 if (decl_jump_unsafe (b
->decl
))
3272 warn_about_goto (g
->loc
, label
, b
->decl
);
3276 /* We also need to warn about decls defined in any scopes
3277 between the scope of the label and the scope of the goto. */
3278 for (scope
= label_vars
->label_bindings
.scope
;
3279 scope
!= g
->goto_bindings
.scope
;
3280 scope
= scope
->outer
)
3282 gcc_assert (scope
!= NULL
);
3283 if (scope
->has_jump_unsafe_decl
)
3285 if (scope
== label_vars
->label_bindings
.scope
)
3286 b
= label_vars
->label_bindings
.bindings_in_scope
;
3288 b
= scope
->bindings
;
3289 for (; b
!= NULL
; b
= b
->prev
)
3291 if (decl_jump_unsafe (b
->decl
))
3292 warn_about_goto (g
->loc
, label
, b
->decl
);
3297 if (g
->goto_bindings
.stmt_exprs
> 0)
3299 error_at (g
->loc
, "jump into statement expression");
3300 inform (DECL_SOURCE_LOCATION (label
), "label %qD defined here",
3305 /* Now that the label is defined, we will issue warnings about
3306 subsequent gotos to this label when we see them. */
3307 vec_safe_truncate (label_vars
->gotos
, 0);
3308 label_vars
->gotos
= NULL
;
3311 /* Define a label, specifying the location in the source file.
3312 Return the LABEL_DECL node for the label, if the definition is valid.
3313 Otherwise return 0. */
3316 define_label (location_t location
, tree name
)
3318 /* Find any preexisting label with this name. It is an error
3319 if that label has already been defined in this function, or
3320 if there is a containing function with a declared label with
3322 tree label
= I_LABEL_DECL (name
);
3325 && ((DECL_CONTEXT (label
) == current_function_decl
3326 && DECL_INITIAL (label
) != 0)
3327 || (DECL_CONTEXT (label
) != current_function_decl
3328 && C_DECLARED_LABEL_FLAG (label
))))
3330 error_at (location
, "duplicate label %qD", label
);
3331 locate_old_decl (label
);
3334 else if (label
&& DECL_CONTEXT (label
) == current_function_decl
)
3336 struct c_label_vars
*label_vars
= I_LABEL_BINDING (name
)->u
.label
;
3338 /* The label has been used or declared already in this function,
3339 but not defined. Update its location to point to this
3341 DECL_SOURCE_LOCATION (label
) = location
;
3342 set_spot_bindings (&label_vars
->label_bindings
, true);
3344 /* Issue warnings as required about any goto statements from
3345 earlier in the function. */
3346 check_earlier_gotos (label
, label_vars
);
3350 struct c_label_vars
*label_vars
;
3352 /* No label binding for that identifier; make one. */
3353 label
= make_label (location
, name
, true, &label_vars
);
3355 /* Ordinary labels go in the current function scope. */
3356 bind_label (name
, label
, current_function_scope
, label_vars
);
3359 if (!in_system_header_at (input_location
) && lookup_name (name
))
3360 warning_at (location
, OPT_Wtraditional
,
3361 "traditional C lacks a separate namespace "
3362 "for labels, identifier %qE conflicts", name
);
3364 /* Mark label as having been defined. */
3365 DECL_INITIAL (label
) = error_mark_node
;
3369 /* Get the bindings for a new switch statement. This is used to issue
3370 warnings as appropriate for jumps from the switch to case or
3373 struct c_spot_bindings
*
3374 c_get_switch_bindings (void)
3376 struct c_spot_bindings
*switch_bindings
;
3378 switch_bindings
= XNEW (struct c_spot_bindings
);
3379 set_spot_bindings (switch_bindings
, true);
3380 return switch_bindings
;
3384 c_release_switch_bindings (struct c_spot_bindings
*bindings
)
3386 gcc_assert (bindings
->stmt_exprs
== 0 && !bindings
->left_stmt_expr
);
3390 /* This is called at the point of a case or default label to issue
3391 warnings about decls as needed. It returns true if it found an
3392 error, not just a warning. */
3395 c_check_switch_jump_warnings (struct c_spot_bindings
*switch_bindings
,
3396 location_t switch_loc
, location_t case_loc
)
3399 struct c_scope
*scope
;
3402 for (scope
= current_scope
;
3403 scope
!= switch_bindings
->scope
;
3404 scope
= scope
->outer
)
3406 struct c_binding
*b
;
3408 gcc_assert (scope
!= NULL
);
3410 if (!scope
->has_jump_unsafe_decl
)
3413 for (b
= scope
->bindings
; b
!= NULL
; b
= b
->prev
)
3415 if (decl_jump_unsafe (b
->decl
))
3417 if (variably_modified_type_p (TREE_TYPE (b
->decl
), NULL_TREE
))
3421 ("switch jumps into scope of identifier with "
3422 "variably modified type"));
3425 warning_at (case_loc
, OPT_Wjump_misses_init
,
3426 "switch jumps over variable initialization");
3427 inform (switch_loc
, "switch starts here");
3428 inform (DECL_SOURCE_LOCATION (b
->decl
), "%qD declared here",
3434 if (switch_bindings
->stmt_exprs
> 0)
3437 error_at (case_loc
, "switch jumps into statement expression");
3438 inform (switch_loc
, "switch starts here");
3444 /* Given NAME, an IDENTIFIER_NODE,
3445 return the structure (or union or enum) definition for that name.
3446 If THISLEVEL_ONLY is nonzero, searches only the current_scope.
3447 CODE says which kind of type the caller wants;
3448 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
3449 If PLOC is not NULL and this returns non-null, it sets *PLOC to the
3450 location where the tag was defined.
3451 If the wrong kind of type is found, an error is reported. */
3454 lookup_tag (enum tree_code code
, tree name
, int thislevel_only
,
3457 struct c_binding
*b
= I_TAG_BINDING (name
);
3463 /* We only care about whether it's in this level if
3464 thislevel_only was set or it might be a type clash. */
3465 if (thislevel_only
|| TREE_CODE (b
->decl
) != code
)
3467 /* For our purposes, a tag in the external scope is the same as
3468 a tag in the file scope. (Primarily relevant to Objective-C
3469 and its builtin structure tags, which get pushed before the
3470 file scope is created.) */
3471 if (B_IN_CURRENT_SCOPE (b
)
3472 || (current_scope
== file_scope
&& B_IN_EXTERNAL_SCOPE (b
)))
3476 if (thislevel_only
&& !thislevel
)
3479 if (TREE_CODE (b
->decl
) != code
)
3481 /* Definition isn't the kind we were looking for. */
3482 pending_invalid_xref
= name
;
3483 pending_invalid_xref_location
= input_location
;
3485 /* If in the same binding level as a declaration as a tag
3486 of a different type, this must not be allowed to
3487 shadow that tag, so give the error immediately.
3488 (For example, "struct foo; union foo;" is invalid.) */
3490 pending_xref_error ();
3499 /* Print an error message now
3500 for a recent invalid struct, union or enum cross reference.
3501 We don't print them immediately because they are not invalid
3502 when used in the `struct foo;' construct for shadowing. */
3505 pending_xref_error (void)
3507 if (pending_invalid_xref
!= 0)
3508 error_at (pending_invalid_xref_location
, "%qE defined as wrong kind of tag",
3509 pending_invalid_xref
);
3510 pending_invalid_xref
= 0;
3514 /* Look up NAME in the current scope and its superiors
3515 in the namespace of variables, functions and typedefs.
3516 Return a ..._DECL node of some kind representing its definition,
3517 or return 0 if it is undefined. */
3520 lookup_name (tree name
)
3522 struct c_binding
*b
= I_SYMBOL_BINDING (name
);
3523 if (b
&& !b
->invisible
)
3525 maybe_record_typedef_use (b
->decl
);
3531 /* Similar to `lookup_name' but look only at the indicated scope. */
3534 lookup_name_in_scope (tree name
, struct c_scope
*scope
)
3536 struct c_binding
*b
;
3538 for (b
= I_SYMBOL_BINDING (name
); b
; b
= b
->shadowed
)
3539 if (B_IN_SCOPE (b
, scope
))
3544 /* Create the predefined scalar types of C,
3545 and some nodes representing standard constants (0, 1, (void *) 0).
3546 Initialize the global scope.
3547 Make definitions for built-in primitive functions. */
3550 c_init_decl_processing (void)
3552 location_t save_loc
= input_location
;
3554 /* Initialize reserved words for parser. */
3557 current_function_decl
= 0;
3559 gcc_obstack_init (&parser_obstack
);
3561 /* Make the externals scope. */
3563 external_scope
= current_scope
;
3565 /* Declarations from c_common_nodes_and_builtins must not be associated
3566 with this input file, lest we get differences between using and not
3567 using preprocessed headers. */
3568 input_location
= BUILTINS_LOCATION
;
3570 c_common_nodes_and_builtins ();
3572 /* In C, comparisons and TRUTH_* expressions have type int. */
3573 truthvalue_type_node
= integer_type_node
;
3574 truthvalue_true_node
= integer_one_node
;
3575 truthvalue_false_node
= integer_zero_node
;
3577 /* Even in C99, which has a real boolean type. */
3578 pushdecl (build_decl (UNKNOWN_LOCATION
, TYPE_DECL
, get_identifier ("_Bool"),
3579 boolean_type_node
));
3581 input_location
= save_loc
;
3583 pedantic_lvalues
= true;
3585 make_fname_decl
= c_make_fname_decl
;
3586 start_fname_decls ();
3589 /* Create the VAR_DECL at LOC for __FUNCTION__ etc. ID is the name to
3590 give the decl, NAME is the initialization string and TYPE_DEP
3591 indicates whether NAME depended on the type of the function. As we
3592 don't yet implement delayed emission of static data, we mark the
3593 decl as emitted so it is not placed in the output. Anything using
3594 it must therefore pull out the STRING_CST initializer directly.
3598 c_make_fname_decl (location_t loc
, tree id
, int type_dep
)
3600 const char *name
= fname_as_string (type_dep
);
3601 tree decl
, type
, init
;
3602 size_t length
= strlen (name
);
3604 type
= build_array_type (char_type_node
,
3605 build_index_type (size_int (length
)));
3606 type
= c_build_qualified_type (type
, TYPE_QUAL_CONST
);
3608 decl
= build_decl (loc
, VAR_DECL
, id
, type
);
3610 TREE_STATIC (decl
) = 1;
3611 TREE_READONLY (decl
) = 1;
3612 DECL_ARTIFICIAL (decl
) = 1;
3614 init
= build_string (length
+ 1, name
);
3615 free (CONST_CAST (char *, name
));
3616 TREE_TYPE (init
) = type
;
3617 DECL_INITIAL (decl
) = init
;
3619 TREE_USED (decl
) = 1;
3621 if (current_function_decl
3622 /* For invalid programs like this:
3625 const char* p = __FUNCTION__;
3627 the __FUNCTION__ is believed to appear in K&R style function
3628 parameter declarator. In that case we still don't have
3630 && (!seen_error () || current_function_scope
))
3632 DECL_CONTEXT (decl
) = current_function_decl
;
3633 bind (id
, decl
, current_function_scope
,
3634 /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION
);
3637 finish_decl (decl
, loc
, init
, NULL_TREE
, NULL_TREE
);
3643 c_builtin_function (tree decl
)
3645 tree type
= TREE_TYPE (decl
);
3646 tree id
= DECL_NAME (decl
);
3648 const char *name
= IDENTIFIER_POINTER (id
);
3649 C_DECL_BUILTIN_PROTOTYPE (decl
) = prototype_p (type
);
3651 /* Should never be called on a symbol with a preexisting meaning. */
3652 gcc_assert (!I_SYMBOL_BINDING (id
));
3654 bind (id
, decl
, external_scope
, /*invisible=*/true, /*nested=*/false,
3657 /* Builtins in the implementation namespace are made visible without
3658 needing to be explicitly declared. See push_file_scope. */
3659 if (name
[0] == '_' && (name
[1] == '_' || ISUPPER (name
[1])))
3661 DECL_CHAIN (decl
) = visible_builtins
;
3662 visible_builtins
= decl
;
3669 c_builtin_function_ext_scope (tree decl
)
3671 tree type
= TREE_TYPE (decl
);
3672 tree id
= DECL_NAME (decl
);
3674 const char *name
= IDENTIFIER_POINTER (id
);
3675 C_DECL_BUILTIN_PROTOTYPE (decl
) = prototype_p (type
);
3678 bind (id
, decl
, external_scope
, /*invisible=*/false, /*nested=*/false,
3681 /* Builtins in the implementation namespace are made visible without
3682 needing to be explicitly declared. See push_file_scope. */
3683 if (name
[0] == '_' && (name
[1] == '_' || ISUPPER (name
[1])))
3685 DECL_CHAIN (decl
) = visible_builtins
;
3686 visible_builtins
= decl
;
3692 /* Called when a declaration is seen that contains no names to declare.
3693 If its type is a reference to a structure, union or enum inherited
3694 from a containing scope, shadow that tag name for the current scope
3695 with a forward reference.
3696 If its type defines a new named structure or union
3697 or defines an enum, it is valid but we need not do anything here.
3698 Otherwise, it is an error. */
3701 shadow_tag (const struct c_declspecs
*declspecs
)
3703 shadow_tag_warned (declspecs
, 0);
3706 /* WARNED is 1 if we have done a pedwarn, 2 if we have done a warning,
3709 shadow_tag_warned (const struct c_declspecs
*declspecs
, int warned
)
3711 bool found_tag
= false;
3713 if (declspecs
->type
&& !declspecs
->default_int_p
&& !declspecs
->typedef_p
)
3715 tree value
= declspecs
->type
;
3716 enum tree_code code
= TREE_CODE (value
);
3718 if (code
== RECORD_TYPE
|| code
== UNION_TYPE
|| code
== ENUMERAL_TYPE
)
3719 /* Used to test also that TYPE_SIZE (value) != 0.
3720 That caused warning for `struct foo;' at top level in the file. */
3722 tree name
= TYPE_NAME (value
);
3727 if (declspecs
->restrict_p
)
3729 error ("invalid use of %<restrict%>");
3735 if (warned
!= 1 && code
!= ENUMERAL_TYPE
)
3736 /* Empty unnamed enum OK */
3738 pedwarn (input_location
, 0,
3739 "unnamed struct/union that defines no instances");
3743 else if (declspecs
->typespec_kind
!= ctsk_tagdef
3744 && declspecs
->typespec_kind
!= ctsk_tagfirstref
3745 && declspecs
->storage_class
!= csc_none
)
3748 pedwarn (input_location
, 0,
3749 "empty declaration with storage class specifier "
3750 "does not redeclare tag");
3752 pending_xref_error ();
3754 else if (declspecs
->typespec_kind
!= ctsk_tagdef
3755 && declspecs
->typespec_kind
!= ctsk_tagfirstref
3756 && (declspecs
->const_p
3757 || declspecs
->volatile_p
3758 || declspecs
->atomic_p
3759 || declspecs
->restrict_p
3760 || declspecs
->address_space
))
3763 pedwarn (input_location
, 0,
3764 "empty declaration with type qualifier "
3765 "does not redeclare tag");
3767 pending_xref_error ();
3769 else if (declspecs
->typespec_kind
!= ctsk_tagdef
3770 && declspecs
->typespec_kind
!= ctsk_tagfirstref
3771 && declspecs
->alignas_p
)
3774 pedwarn (input_location
, 0,
3775 "empty declaration with %<_Alignas%> "
3776 "does not redeclare tag");
3778 pending_xref_error ();
3782 pending_invalid_xref
= 0;
3783 t
= lookup_tag (code
, name
, 1, NULL
);
3787 t
= make_node (code
);
3788 pushtag (input_location
, name
, t
);
3794 if (warned
!= 1 && !in_system_header_at (input_location
))
3796 pedwarn (input_location
, 0,
3797 "useless type name in empty declaration");
3802 else if (warned
!= 1 && !in_system_header_at (input_location
)
3803 && declspecs
->typedef_p
)
3805 pedwarn (input_location
, 0, "useless type name in empty declaration");
3809 pending_invalid_xref
= 0;
3811 if (declspecs
->inline_p
)
3813 error ("%<inline%> in empty declaration");
3817 if (declspecs
->noreturn_p
)
3819 error ("%<_Noreturn%> in empty declaration");
3823 if (current_scope
== file_scope
&& declspecs
->storage_class
== csc_auto
)
3825 error ("%<auto%> in file-scope empty declaration");
3829 if (current_scope
== file_scope
&& declspecs
->storage_class
== csc_register
)
3831 error ("%<register%> in file-scope empty declaration");
3835 if (!warned
&& !in_system_header_at (input_location
)
3836 && declspecs
->storage_class
!= csc_none
)
3838 warning (0, "useless storage class specifier in empty declaration");
3842 if (!warned
&& !in_system_header_at (input_location
) && declspecs
->thread_p
)
3844 warning (0, "useless %qs in empty declaration",
3845 declspecs
->thread_gnu_p
? "__thread" : "_Thread_local");
3850 && !in_system_header_at (input_location
)
3851 && (declspecs
->const_p
3852 || declspecs
->volatile_p
3853 || declspecs
->atomic_p
3854 || declspecs
->restrict_p
3855 || declspecs
->address_space
))
3857 warning (0, "useless type qualifier in empty declaration");
3861 if (!warned
&& !in_system_header_at (input_location
)
3862 && declspecs
->alignas_p
)
3864 warning (0, "useless %<_Alignas%> in empty declaration");
3871 pedwarn (input_location
, 0, "empty declaration");
3876 /* Return the qualifiers from SPECS as a bitwise OR of TYPE_QUAL_*
3877 bits. SPECS represents declaration specifiers that the grammar
3878 only permits to contain type qualifiers and attributes. */
3881 quals_from_declspecs (const struct c_declspecs
*specs
)
3883 int quals
= ((specs
->const_p
? TYPE_QUAL_CONST
: 0)
3884 | (specs
->volatile_p
? TYPE_QUAL_VOLATILE
: 0)
3885 | (specs
->restrict_p
? TYPE_QUAL_RESTRICT
: 0)
3886 | (specs
->atomic_p
? TYPE_QUAL_ATOMIC
: 0)
3887 | (ENCODE_QUAL_ADDR_SPACE (specs
->address_space
)));
3888 gcc_assert (!specs
->type
3889 && !specs
->decl_attr
3890 && specs
->typespec_word
== cts_none
3891 && specs
->storage_class
== csc_none
3892 && !specs
->typedef_p
3893 && !specs
->explicit_signed_p
3894 && !specs
->deprecated_p
3896 && !specs
->long_long_p
3899 && !specs
->unsigned_p
3900 && !specs
->complex_p
3902 && !specs
->noreturn_p
3903 && !specs
->thread_p
);
3907 /* Construct an array declarator. LOC is the location of the
3908 beginning of the array (usually the opening brace). EXPR is the
3909 expression inside [], or NULL_TREE. QUALS are the type qualifiers
3910 inside the [] (to be applied to the pointer to which a parameter
3911 array is converted). STATIC_P is true if "static" is inside the
3912 [], false otherwise. VLA_UNSPEC_P is true if the array is [*], a
3913 VLA of unspecified length which is nevertheless a complete type,
3914 false otherwise. The field for the contained declarator is left to
3915 be filled in by set_array_declarator_inner. */
3917 struct c_declarator
*
3918 build_array_declarator (location_t loc
,
3919 tree expr
, struct c_declspecs
*quals
, bool static_p
,
3922 struct c_declarator
*declarator
= XOBNEW (&parser_obstack
,
3923 struct c_declarator
);
3924 declarator
->id_loc
= loc
;
3925 declarator
->kind
= cdk_array
;
3926 declarator
->declarator
= 0;
3927 declarator
->u
.array
.dimen
= expr
;
3930 declarator
->u
.array
.attrs
= quals
->attrs
;
3931 declarator
->u
.array
.quals
= quals_from_declspecs (quals
);
3935 declarator
->u
.array
.attrs
= NULL_TREE
;
3936 declarator
->u
.array
.quals
= 0;
3938 declarator
->u
.array
.static_p
= static_p
;
3939 declarator
->u
.array
.vla_unspec_p
= vla_unspec_p
;
3942 if (static_p
|| quals
!= NULL
)
3943 pedwarn (loc
, OPT_Wpedantic
,
3944 "ISO C90 does not support %<static%> or type "
3945 "qualifiers in parameter array declarators");
3947 pedwarn (loc
, OPT_Wpedantic
,
3948 "ISO C90 does not support %<[*]%> array declarators");
3952 if (!current_scope
->parm_flag
)
3955 error_at (loc
, "%<[*]%> not allowed in other than "
3956 "function prototype scope");
3957 declarator
->u
.array
.vla_unspec_p
= false;
3960 current_scope
->had_vla_unspec
= true;
3965 /* Set the contained declarator of an array declarator. DECL is the
3966 declarator, as constructed by build_array_declarator; INNER is what
3967 appears on the left of the []. */
3969 struct c_declarator
*
3970 set_array_declarator_inner (struct c_declarator
*decl
,
3971 struct c_declarator
*inner
)
3973 decl
->declarator
= inner
;
3977 /* INIT is a constructor that forms DECL's initializer. If the final
3978 element initializes a flexible array field, add the size of that
3979 initializer to DECL's size. */
3982 add_flexible_array_elts_to_size (tree decl
, tree init
)
3986 if (vec_safe_is_empty (CONSTRUCTOR_ELTS (init
)))
3989 elt
= CONSTRUCTOR_ELTS (init
)->last ().value
;
3990 type
= TREE_TYPE (elt
);
3991 if (TREE_CODE (type
) == ARRAY_TYPE
3992 && TYPE_SIZE (type
) == NULL_TREE
3993 && TYPE_DOMAIN (type
) != NULL_TREE
3994 && TYPE_MAX_VALUE (TYPE_DOMAIN (type
)) == NULL_TREE
)
3996 complete_array_type (&type
, elt
, false);
3998 = size_binop (PLUS_EXPR
, DECL_SIZE (decl
), TYPE_SIZE (type
));
3999 DECL_SIZE_UNIT (decl
)
4000 = size_binop (PLUS_EXPR
, DECL_SIZE_UNIT (decl
), TYPE_SIZE_UNIT (type
));
4004 /* Decode a "typename", such as "int **", returning a ..._TYPE node.
4005 Set *EXPR, if EXPR not NULL, to any expression to be evaluated
4006 before the type name, and set *EXPR_CONST_OPERANDS, if
4007 EXPR_CONST_OPERANDS not NULL, to indicate whether the type name may
4008 appear in a constant expression. */
4011 groktypename (struct c_type_name
*type_name
, tree
*expr
,
4012 bool *expr_const_operands
)
4015 tree attrs
= type_name
->specs
->attrs
;
4017 type_name
->specs
->attrs
= NULL_TREE
;
4019 type
= grokdeclarator (type_name
->declarator
, type_name
->specs
, TYPENAME
,
4020 false, NULL
, &attrs
, expr
, expr_const_operands
,
4023 /* Apply attributes. */
4024 decl_attributes (&type
, attrs
, 0);
4029 /* Wrapper for decl_attributes that adds some implicit attributes
4030 to VAR_DECLs or FUNCTION_DECLs. */
4033 c_decl_attributes (tree
*node
, tree attributes
, int flags
)
4035 /* Add implicit "omp declare target" attribute if requested. */
4036 if (current_omp_declare_target_attribute
4037 && ((TREE_CODE (*node
) == VAR_DECL
&& TREE_STATIC (*node
))
4038 || TREE_CODE (*node
) == FUNCTION_DECL
))
4040 if (TREE_CODE (*node
) == VAR_DECL
4041 && ((DECL_CONTEXT (*node
)
4042 && TREE_CODE (DECL_CONTEXT (*node
)) == FUNCTION_DECL
)
4043 || (current_function_decl
&& !DECL_EXTERNAL (*node
))))
4044 error ("%q+D in block scope inside of declare target directive",
4046 else if (TREE_CODE (*node
) == VAR_DECL
4047 && !lang_hooks
.types
.omp_mappable_type (TREE_TYPE (*node
)))
4048 error ("%q+D in declare target directive does not have mappable type",
4051 attributes
= tree_cons (get_identifier ("omp declare target"),
4052 NULL_TREE
, attributes
);
4054 return decl_attributes (node
, attributes
, flags
);
4058 /* Decode a declarator in an ordinary declaration or data definition.
4059 This is called as soon as the type information and variable name
4060 have been parsed, before parsing the initializer if any.
4061 Here we create the ..._DECL node, fill in its type,
4062 and put it on the list of decls for the current context.
4063 The ..._DECL node is returned as the value.
4065 Exception: for arrays where the length is not specified,
4066 the type is left null, to be filled in by `finish_decl'.
4068 Function definitions do not come here; they go to start_function
4069 instead. However, external and forward declarations of functions
4070 do go through here. Structure field declarations are done by
4071 grokfield and not through here. */
4074 start_decl (struct c_declarator
*declarator
, struct c_declspecs
*declspecs
,
4075 bool initialized
, tree attributes
)
4079 tree expr
= NULL_TREE
;
4080 enum deprecated_states deprecated_state
= DEPRECATED_NORMAL
;
4082 /* An object declared as __attribute__((deprecated)) suppresses
4083 warnings of uses of other deprecated items. */
4084 if (lookup_attribute ("deprecated", attributes
))
4085 deprecated_state
= DEPRECATED_SUPPRESS
;
4087 decl
= grokdeclarator (declarator
, declspecs
,
4088 NORMAL
, initialized
, NULL
, &attributes
, &expr
, NULL
,
4094 add_stmt (fold_convert (void_type_node
, expr
));
4096 if (TREE_CODE (decl
) != FUNCTION_DECL
&& MAIN_NAME_P (DECL_NAME (decl
)))
4097 warning (OPT_Wmain
, "%q+D is usually a function", decl
);
4100 /* Is it valid for this decl to have an initializer at all?
4101 If not, set INITIALIZED to zero, which will indirectly
4102 tell 'finish_decl' to ignore the initializer once it is parsed. */
4103 switch (TREE_CODE (decl
))
4106 error ("typedef %qD is initialized (use __typeof__ instead)", decl
);
4111 error ("function %qD is initialized like a variable", decl
);
4116 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
4117 error ("parameter %qD is initialized", decl
);
4122 /* Don't allow initializations for incomplete types except for
4123 arrays which might be completed by the initialization. */
4125 /* This can happen if the array size is an undefined macro.
4126 We already gave a warning, so we don't need another one. */
4127 if (TREE_TYPE (decl
) == error_mark_node
)
4129 else if (COMPLETE_TYPE_P (TREE_TYPE (decl
)))
4131 /* A complete type is ok if size is fixed. */
4133 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl
))) != INTEGER_CST
4134 || C_DECL_VARIABLE_SIZE (decl
))
4136 error ("variable-sized object may not be initialized");
4140 else if (TREE_CODE (TREE_TYPE (decl
)) != ARRAY_TYPE
)
4142 error ("variable %qD has initializer but incomplete type", decl
);
4145 else if (C_DECL_VARIABLE_SIZE (decl
))
4147 /* Although C99 is unclear about whether incomplete arrays
4148 of VLAs themselves count as VLAs, it does not make
4149 sense to permit them to be initialized given that
4150 ordinary VLAs may not be initialized. */
4151 error ("variable-sized object may not be initialized");
4158 if (current_scope
== file_scope
)
4159 TREE_STATIC (decl
) = 1;
4161 /* Tell 'pushdecl' this is an initialized decl
4162 even though we don't yet have the initializer expression.
4163 Also tell 'finish_decl' it may store the real initializer. */
4164 DECL_INITIAL (decl
) = error_mark_node
;
4167 /* If this is a function declaration, write a record describing it to the
4168 prototypes file (if requested). */
4170 if (TREE_CODE (decl
) == FUNCTION_DECL
)
4171 gen_aux_info_record (decl
, 0, 0, prototype_p (TREE_TYPE (decl
)));
4173 /* ANSI specifies that a tentative definition which is not merged with
4174 a non-tentative definition behaves exactly like a definition with an
4175 initializer equal to zero. (Section 3.7.2)
4177 -fno-common gives strict ANSI behavior, though this tends to break
4178 a large body of code that grew up without this rule.
4180 Thread-local variables are never common, since there's no entrenched
4181 body of code to break, and it allows more efficient variable references
4182 in the presence of dynamic linking. */
4184 if (TREE_CODE (decl
) == VAR_DECL
4186 && TREE_PUBLIC (decl
)
4187 && !DECL_THREAD_LOCAL_P (decl
)
4189 DECL_COMMON (decl
) = 1;
4191 /* Set attributes here so if duplicate decl, will have proper attributes. */
4192 c_decl_attributes (&decl
, attributes
, 0);
4194 /* Handle gnu_inline attribute. */
4195 if (declspecs
->inline_p
4196 && !flag_gnu89_inline
4197 && TREE_CODE (decl
) == FUNCTION_DECL
4198 && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl
))
4199 || current_function_decl
))
4201 if (declspecs
->storage_class
== csc_auto
&& current_scope
!= file_scope
)
4203 else if (declspecs
->storage_class
!= csc_static
)
4204 DECL_EXTERNAL (decl
) = !DECL_EXTERNAL (decl
);
4207 if (TREE_CODE (decl
) == FUNCTION_DECL
4208 && targetm
.calls
.promote_prototypes (TREE_TYPE (decl
)))
4210 struct c_declarator
*ce
= declarator
;
4212 if (ce
->kind
== cdk_pointer
)
4213 ce
= declarator
->declarator
;
4214 if (ce
->kind
== cdk_function
)
4216 tree args
= ce
->u
.arg_info
->parms
;
4217 for (; args
; args
= DECL_CHAIN (args
))
4219 tree type
= TREE_TYPE (args
);
4220 if (type
&& INTEGRAL_TYPE_P (type
)
4221 && TYPE_PRECISION (type
) < TYPE_PRECISION (integer_type_node
))
4222 DECL_ARG_TYPE (args
) = c_type_promotes_to (type
);
4227 if (TREE_CODE (decl
) == FUNCTION_DECL
4228 && DECL_DECLARED_INLINE_P (decl
)
4229 && DECL_UNINLINABLE (decl
)
4230 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl
)))
4231 warning (OPT_Wattributes
, "inline function %q+D given attribute noinline",
4234 /* C99 6.7.4p3: An inline definition of a function with external
4235 linkage shall not contain a definition of a modifiable object
4236 with static storage duration... */
4237 if (TREE_CODE (decl
) == VAR_DECL
4238 && current_scope
!= file_scope
4239 && TREE_STATIC (decl
)
4240 && !TREE_READONLY (decl
)
4241 && DECL_DECLARED_INLINE_P (current_function_decl
)
4242 && DECL_EXTERNAL (current_function_decl
))
4243 record_inline_static (input_location
, current_function_decl
,
4244 decl
, csi_modifiable
);
4246 if (c_dialect_objc ()
4247 && (TREE_CODE (decl
) == VAR_DECL
4248 || TREE_CODE (decl
) == FUNCTION_DECL
))
4249 objc_check_global_decl (decl
);
4251 /* Add this decl to the current scope.
4252 TEM may equal DECL or it may be a previous decl of the same name. */
4253 tem
= pushdecl (decl
);
4255 if (initialized
&& DECL_EXTERNAL (tem
))
4257 DECL_EXTERNAL (tem
) = 0;
4258 TREE_STATIC (tem
) = 1;
4264 /* Subroutine of finish_decl. TYPE is the type of an uninitialized object
4265 DECL or the non-array element type if DECL is an uninitialized array.
4266 If that type has a const member, diagnose this. */
4269 diagnose_uninitialized_cst_member (tree decl
, tree type
)
4272 for (field
= TYPE_FIELDS (type
); field
; field
= TREE_CHAIN (field
))
4275 if (TREE_CODE (field
) != FIELD_DECL
)
4277 field_type
= strip_array_types (TREE_TYPE (field
));
4279 if (TYPE_QUALS (field_type
) & TYPE_QUAL_CONST
)
4281 warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wc___compat
,
4282 "uninitialized const member in %qT is invalid in C++",
4283 strip_array_types (TREE_TYPE (decl
)));
4284 inform (DECL_SOURCE_LOCATION (field
), "%qD should be initialized", field
);
4287 if (TREE_CODE (field_type
) == RECORD_TYPE
4288 || TREE_CODE (field_type
) == UNION_TYPE
)
4289 diagnose_uninitialized_cst_member (decl
, field_type
);
4293 /* Finish processing of a declaration;
4294 install its initial value.
4295 If ORIGTYPE is not NULL_TREE, it is the original type of INIT.
4296 If the length of an array type is not known before,
4297 it must be determined now, from the initial value, or it is an error.
4299 INIT_LOC is the location of the initial value. */
4302 finish_decl (tree decl
, location_t init_loc
, tree init
,
4303 tree origtype
, tree asmspec_tree
)
4306 bool was_incomplete
= (DECL_SIZE (decl
) == 0);
4307 const char *asmspec
= 0;
4309 /* If a name was specified, get the string. */
4310 if ((TREE_CODE (decl
) == FUNCTION_DECL
|| TREE_CODE (decl
) == VAR_DECL
)
4311 && DECL_FILE_SCOPE_P (decl
))
4312 asmspec_tree
= maybe_apply_renaming_pragma (decl
, asmspec_tree
);
4314 asmspec
= TREE_STRING_POINTER (asmspec_tree
);
4316 if (TREE_CODE (decl
) == VAR_DECL
4317 && TREE_STATIC (decl
)
4318 && global_bindings_p ())
4319 /* So decl is a global variable. Record the types it uses
4320 so that we can decide later to emit debug info for them. */
4321 record_types_used_by_current_var_decl (decl
);
4323 /* If `start_decl' didn't like having an initialization, ignore it now. */
4324 if (init
!= 0 && DECL_INITIAL (decl
) == 0)
4327 /* Don't crash if parm is initialized. */
4328 if (TREE_CODE (decl
) == PARM_DECL
)
4332 store_init_value (init_loc
, decl
, init
, origtype
);
4334 if (c_dialect_objc () && (TREE_CODE (decl
) == VAR_DECL
4335 || TREE_CODE (decl
) == FUNCTION_DECL
4336 || TREE_CODE (decl
) == FIELD_DECL
))
4337 objc_check_decl (decl
);
4339 type
= TREE_TYPE (decl
);
4341 /* Deduce size of array from initialization, if not already known. */
4342 if (TREE_CODE (type
) == ARRAY_TYPE
4343 && TYPE_DOMAIN (type
) == 0
4344 && TREE_CODE (decl
) != TYPE_DECL
)
4347 = (TREE_STATIC (decl
)
4348 /* Even if pedantic, an external linkage array
4349 may have incomplete type at first. */
4350 ? pedantic
&& !TREE_PUBLIC (decl
)
4351 : !DECL_EXTERNAL (decl
));
4353 = complete_array_type (&TREE_TYPE (decl
), DECL_INITIAL (decl
),
4356 /* Get the completed type made by complete_array_type. */
4357 type
= TREE_TYPE (decl
);
4362 error ("initializer fails to determine size of %q+D", decl
);
4367 error ("array size missing in %q+D", decl
);
4368 /* If a `static' var's size isn't known,
4369 make it extern as well as static, so it does not get
4371 If it is not `static', then do not mark extern;
4372 finish_incomplete_decl will give it a default size
4373 and it will get allocated. */
4374 else if (!pedantic
&& TREE_STATIC (decl
) && !TREE_PUBLIC (decl
))
4375 DECL_EXTERNAL (decl
) = 1;
4379 error ("zero or negative size array %q+D", decl
);
4383 /* For global variables, update the copy of the type that
4384 exists in the binding. */
4385 if (TREE_PUBLIC (decl
))
4387 struct c_binding
*b_ext
= I_SYMBOL_BINDING (DECL_NAME (decl
));
4388 while (b_ext
&& !B_IN_EXTERNAL_SCOPE (b_ext
))
4389 b_ext
= b_ext
->shadowed
;
4392 if (b_ext
->u
.type
&& comptypes (b_ext
->u
.type
, type
))
4393 b_ext
->u
.type
= composite_type (b_ext
->u
.type
, type
);
4395 b_ext
->u
.type
= type
;
4404 if (DECL_INITIAL (decl
))
4405 TREE_TYPE (DECL_INITIAL (decl
)) = type
;
4407 relayout_decl (decl
);
4410 if (TREE_CODE (decl
) == VAR_DECL
)
4412 if (init
&& TREE_CODE (init
) == CONSTRUCTOR
)
4413 add_flexible_array_elts_to_size (decl
, init
);
4415 if (DECL_SIZE (decl
) == 0 && TREE_TYPE (decl
) != error_mark_node
4416 && COMPLETE_TYPE_P (TREE_TYPE (decl
)))
4417 layout_decl (decl
, 0);
4419 if (DECL_SIZE (decl
) == 0
4420 /* Don't give an error if we already gave one earlier. */
4421 && TREE_TYPE (decl
) != error_mark_node
4422 && (TREE_STATIC (decl
)
4423 /* A static variable with an incomplete type
4424 is an error if it is initialized.
4425 Also if it is not file scope.
4426 Otherwise, let it through, but if it is not `extern'
4427 then it may cause an error message later. */
4428 ? (DECL_INITIAL (decl
) != 0
4429 || !DECL_FILE_SCOPE_P (decl
))
4430 /* An automatic variable with an incomplete type
4432 : !DECL_EXTERNAL (decl
)))
4434 error ("storage size of %q+D isn%'t known", decl
);
4435 TREE_TYPE (decl
) = error_mark_node
;
4438 if ((DECL_EXTERNAL (decl
) || TREE_STATIC (decl
))
4439 && DECL_SIZE (decl
) != 0)
4441 if (TREE_CODE (DECL_SIZE (decl
)) == INTEGER_CST
)
4442 constant_expression_warning (DECL_SIZE (decl
));
4445 error ("storage size of %q+D isn%'t constant", decl
);
4446 TREE_TYPE (decl
) = error_mark_node
;
4450 if (TREE_USED (type
))
4452 TREE_USED (decl
) = 1;
4453 DECL_READ_P (decl
) = 1;
4457 /* If this is a function and an assembler name is specified, reset DECL_RTL
4458 so we can give it its new name. Also, update builtin_decl if it
4459 was a normal built-in. */
4460 if (TREE_CODE (decl
) == FUNCTION_DECL
&& asmspec
)
4462 if (DECL_BUILT_IN_CLASS (decl
) == BUILT_IN_NORMAL
)
4463 set_builtin_user_assembler_name (decl
, asmspec
);
4464 set_user_assembler_name (decl
, asmspec
);
4467 /* If #pragma weak was used, mark the decl weak now. */
4468 maybe_apply_pragma_weak (decl
);
4470 /* Output the assembler code and/or RTL code for variables and functions,
4471 unless the type is an undefined structure or union.
4472 If not, it will get done when the type is completed. */
4474 if (TREE_CODE (decl
) == VAR_DECL
|| TREE_CODE (decl
) == FUNCTION_DECL
)
4476 /* Determine the ELF visibility. */
4477 if (TREE_PUBLIC (decl
))
4478 c_determine_visibility (decl
);
4480 /* This is a no-op in c-lang.c or something real in objc-act.c. */
4481 if (c_dialect_objc ())
4482 objc_check_decl (decl
);
4486 /* If this is not a static variable, issue a warning.
4487 It doesn't make any sense to give an ASMSPEC for an
4488 ordinary, non-register local variable. Historically,
4489 GCC has accepted -- but ignored -- the ASMSPEC in
4491 if (!DECL_FILE_SCOPE_P (decl
)
4492 && TREE_CODE (decl
) == VAR_DECL
4493 && !C_DECL_REGISTER (decl
)
4494 && !TREE_STATIC (decl
))
4495 warning (0, "ignoring asm-specifier for non-static local "
4496 "variable %q+D", decl
);
4498 set_user_assembler_name (decl
, asmspec
);
4501 if (DECL_FILE_SCOPE_P (decl
))
4503 if (DECL_INITIAL (decl
) == NULL_TREE
4504 || DECL_INITIAL (decl
) == error_mark_node
)
4505 /* Don't output anything
4506 when a tentative file-scope definition is seen.
4507 But at end of compilation, do output code for them. */
4508 DECL_DEFER_OUTPUT (decl
) = 1;
4509 if (asmspec
&& C_DECL_REGISTER (decl
))
4510 DECL_HARD_REGISTER (decl
) = 1;
4511 rest_of_decl_compilation (decl
, true, 0);
4515 /* In conjunction with an ASMSPEC, the `register'
4516 keyword indicates that we should place the variable
4517 in a particular register. */
4518 if (asmspec
&& C_DECL_REGISTER (decl
))
4520 DECL_HARD_REGISTER (decl
) = 1;
4521 /* This cannot be done for a structure with volatile
4522 fields, on which DECL_REGISTER will have been
4524 if (!DECL_REGISTER (decl
))
4525 error ("cannot put object with volatile field into register");
4528 if (TREE_CODE (decl
) != FUNCTION_DECL
)
4530 /* If we're building a variable sized type, and we might be
4531 reachable other than via the top of the current binding
4532 level, then create a new BIND_EXPR so that we deallocate
4533 the object at the right time. */
4534 /* Note that DECL_SIZE can be null due to errors. */
4535 if (DECL_SIZE (decl
)
4536 && !TREE_CONSTANT (DECL_SIZE (decl
))
4537 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list
))
4540 bind
= build3 (BIND_EXPR
, void_type_node
, NULL
, NULL
, NULL
);
4541 TREE_SIDE_EFFECTS (bind
) = 1;
4543 BIND_EXPR_BODY (bind
) = push_stmt_list ();
4545 add_stmt (build_stmt (DECL_SOURCE_LOCATION (decl
),
4551 if (!DECL_FILE_SCOPE_P (decl
))
4553 /* Recompute the RTL of a local array now
4554 if it used to be an incomplete type. */
4556 && !TREE_STATIC (decl
) && !DECL_EXTERNAL (decl
))
4558 /* If we used it already as memory, it must stay in memory. */
4559 TREE_ADDRESSABLE (decl
) = TREE_USED (decl
);
4560 /* If it's still incomplete now, no init will save it. */
4561 if (DECL_SIZE (decl
) == 0)
4562 DECL_INITIAL (decl
) = 0;
4567 if (TREE_CODE (decl
) == TYPE_DECL
)
4569 if (!DECL_FILE_SCOPE_P (decl
)
4570 && variably_modified_type_p (TREE_TYPE (decl
), NULL_TREE
))
4571 add_stmt (build_stmt (DECL_SOURCE_LOCATION (decl
), DECL_EXPR
, decl
));
4573 rest_of_decl_compilation (decl
, DECL_FILE_SCOPE_P (decl
), 0);
4576 /* Install a cleanup (aka destructor) if one was given. */
4577 if (TREE_CODE (decl
) == VAR_DECL
&& !TREE_STATIC (decl
))
4579 tree attr
= lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl
));
4582 tree cleanup_id
= TREE_VALUE (TREE_VALUE (attr
));
4583 tree cleanup_decl
= lookup_name (cleanup_id
);
4585 vec
<tree
, va_gc
> *v
;
4587 /* Build "cleanup(&decl)" for the destructor. */
4588 cleanup
= build_unary_op (input_location
, ADDR_EXPR
, decl
, 0);
4590 v
->quick_push (cleanup
);
4591 cleanup
= c_build_function_call_vec (DECL_SOURCE_LOCATION (decl
),
4592 vNULL
, cleanup_decl
, v
, NULL
);
4595 /* Don't warn about decl unused; the cleanup uses it. */
4596 TREE_USED (decl
) = 1;
4597 TREE_USED (cleanup_decl
) = 1;
4598 DECL_READ_P (decl
) = 1;
4600 push_cleanup (decl
, cleanup
, false);
4605 && TREE_CODE (decl
) == VAR_DECL
4606 && !DECL_EXTERNAL (decl
)
4607 && DECL_INITIAL (decl
) == NULL_TREE
)
4609 type
= strip_array_types (type
);
4610 if (TREE_READONLY (decl
))
4611 warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wc___compat
,
4612 "uninitialized const %qD is invalid in C++", decl
);
4613 else if ((TREE_CODE (type
) == RECORD_TYPE
4614 || TREE_CODE (type
) == UNION_TYPE
)
4615 && C_TYPE_FIELDS_READONLY (type
))
4616 diagnose_uninitialized_cst_member (decl
, type
);
4619 invoke_plugin_callbacks (PLUGIN_FINISH_DECL
, decl
);
4622 /* Given a parsed parameter declaration, decode it into a PARM_DECL.
4623 EXPR is NULL or a pointer to an expression that needs to be
4624 evaluated for the side effects of array size expressions in the
4628 grokparm (const struct c_parm
*parm
, tree
*expr
)
4630 tree attrs
= parm
->attrs
;
4631 tree decl
= grokdeclarator (parm
->declarator
, parm
->specs
, PARM
, false,
4632 NULL
, &attrs
, expr
, NULL
, DEPRECATED_NORMAL
);
4634 decl_attributes (&decl
, attrs
, 0);
4639 /* Given a parsed parameter declaration, decode it into a PARM_DECL
4640 and push that on the current scope. EXPR is a pointer to an
4641 expression that needs to be evaluated for the side effects of array
4642 size expressions in the parameters. */
4645 push_parm_decl (const struct c_parm
*parm
, tree
*expr
)
4647 tree attrs
= parm
->attrs
;
4650 decl
= grokdeclarator (parm
->declarator
, parm
->specs
, PARM
, false, NULL
,
4651 &attrs
, expr
, NULL
, DEPRECATED_NORMAL
);
4652 decl_attributes (&decl
, attrs
, 0);
4654 decl
= pushdecl (decl
);
4656 finish_decl (decl
, input_location
, NULL_TREE
, NULL_TREE
, NULL_TREE
);
4659 /* Mark all the parameter declarations to date as forward decls.
4660 Also diagnose use of this extension. */
4663 mark_forward_parm_decls (void)
4665 struct c_binding
*b
;
4667 if (pedantic
&& !current_scope
->warned_forward_parm_decls
)
4669 pedwarn (input_location
, OPT_Wpedantic
,
4670 "ISO C forbids forward parameter declarations");
4671 current_scope
->warned_forward_parm_decls
= true;
4674 for (b
= current_scope
->bindings
; b
; b
= b
->prev
)
4675 if (TREE_CODE (b
->decl
) == PARM_DECL
)
4676 TREE_ASM_WRITTEN (b
->decl
) = 1;
4679 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
4680 literal, which may be an incomplete array type completed by the
4681 initializer; INIT is a CONSTRUCTOR at LOC that initializes the compound
4682 literal. NON_CONST is true if the initializers contain something
4683 that cannot occur in a constant expression. */
4686 build_compound_literal (location_t loc
, tree type
, tree init
, bool non_const
)
4688 /* We do not use start_decl here because we have a type, not a declarator;
4689 and do not use finish_decl because the decl should be stored inside
4690 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_EXPR. */
4695 if (type
== error_mark_node
4696 || init
== error_mark_node
)
4697 return error_mark_node
;
4699 decl
= build_decl (loc
, VAR_DECL
, NULL_TREE
, type
);
4700 DECL_EXTERNAL (decl
) = 0;
4701 TREE_PUBLIC (decl
) = 0;
4702 TREE_STATIC (decl
) = (current_scope
== file_scope
);
4703 DECL_CONTEXT (decl
) = current_function_decl
;
4704 TREE_USED (decl
) = 1;
4705 DECL_READ_P (decl
) = 1;
4706 TREE_TYPE (decl
) = type
;
4707 TREE_READONLY (decl
) = (TYPE_READONLY (type
)
4708 || (TREE_CODE (type
) == ARRAY_TYPE
4709 && TYPE_READONLY (TREE_TYPE (type
))));
4710 store_init_value (loc
, decl
, init
, NULL_TREE
);
4712 if (TREE_CODE (type
) == ARRAY_TYPE
&& !COMPLETE_TYPE_P (type
))
4714 int failure
= complete_array_type (&TREE_TYPE (decl
),
4715 DECL_INITIAL (decl
), true);
4716 /* If complete_array_type returns 3, it means that the
4717 initial value of the compound literal is empty. Allow it. */
4718 gcc_assert (failure
== 0 || failure
== 3);
4720 type
= TREE_TYPE (decl
);
4721 TREE_TYPE (DECL_INITIAL (decl
)) = type
;
4724 if (type
== error_mark_node
|| !COMPLETE_TYPE_P (type
))
4726 c_incomplete_type_error (NULL_TREE
, type
);
4727 return error_mark_node
;
4730 stmt
= build_stmt (DECL_SOURCE_LOCATION (decl
), DECL_EXPR
, decl
);
4731 complit
= build1 (COMPOUND_LITERAL_EXPR
, type
, stmt
);
4732 TREE_SIDE_EFFECTS (complit
) = 1;
4734 layout_decl (decl
, 0);
4736 if (TREE_STATIC (decl
))
4738 /* This decl needs a name for the assembler output. */
4739 set_compound_literal_name (decl
);
4740 DECL_DEFER_OUTPUT (decl
) = 1;
4741 DECL_COMDAT (decl
) = 1;
4742 DECL_ARTIFICIAL (decl
) = 1;
4743 DECL_IGNORED_P (decl
) = 1;
4745 rest_of_decl_compilation (decl
, 1, 0);
4750 complit
= build2 (C_MAYBE_CONST_EXPR
, type
, NULL
, complit
);
4751 C_MAYBE_CONST_EXPR_NON_CONST (complit
) = 1;
4757 /* Check the type of a compound literal. Here we just check that it
4758 is valid for C++. */
4761 check_compound_literal_type (location_t loc
, struct c_type_name
*type_name
)
4764 && (type_name
->specs
->typespec_kind
== ctsk_tagdef
4765 || type_name
->specs
->typespec_kind
== ctsk_tagfirstref
))
4766 warning_at (loc
, OPT_Wc___compat
,
4767 "defining a type in a compound literal is invalid in C++");
4770 /* Determine whether TYPE is a structure with a flexible array member,
4771 or a union containing such a structure (possibly recursively). */
4774 flexible_array_type_p (tree type
)
4777 switch (TREE_CODE (type
))
4780 x
= TYPE_FIELDS (type
);
4783 while (DECL_CHAIN (x
) != NULL_TREE
)
4785 if (TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
4786 && TYPE_SIZE (TREE_TYPE (x
)) == NULL_TREE
4787 && TYPE_DOMAIN (TREE_TYPE (x
)) != NULL_TREE
4788 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x
))) == NULL_TREE
)
4792 for (x
= TYPE_FIELDS (type
); x
!= NULL_TREE
; x
= DECL_CHAIN (x
))
4794 if (flexible_array_type_p (TREE_TYPE (x
)))
4803 /* Performs sanity checks on the TYPE and WIDTH of the bit-field NAME,
4804 replacing with appropriate values if they are invalid. */
4806 check_bitfield_type_and_width (tree
*type
, tree
*width
, tree orig_name
)
4809 unsigned int max_width
;
4810 unsigned HOST_WIDE_INT w
;
4811 const char *name
= (orig_name
4812 ? identifier_to_locale (IDENTIFIER_POINTER (orig_name
))
4813 : _("<anonymous>"));
4815 /* Detect and ignore out of range field width and process valid
4817 if (!INTEGRAL_TYPE_P (TREE_TYPE (*width
)))
4819 error ("bit-field %qs width not an integer constant", name
);
4820 *width
= integer_one_node
;
4824 if (TREE_CODE (*width
) != INTEGER_CST
)
4826 *width
= c_fully_fold (*width
, false, NULL
);
4827 if (TREE_CODE (*width
) == INTEGER_CST
)
4828 pedwarn (input_location
, OPT_Wpedantic
,
4829 "bit-field %qs width not an integer constant expression",
4832 if (TREE_CODE (*width
) != INTEGER_CST
)
4834 error ("bit-field %qs width not an integer constant", name
);
4835 *width
= integer_one_node
;
4837 constant_expression_warning (*width
);
4838 if (tree_int_cst_sgn (*width
) < 0)
4840 error ("negative width in bit-field %qs", name
);
4841 *width
= integer_one_node
;
4843 else if (integer_zerop (*width
) && orig_name
)
4845 error ("zero width for bit-field %qs", name
);
4846 *width
= integer_one_node
;
4850 /* Detect invalid bit-field type. */
4851 if (TREE_CODE (*type
) != INTEGER_TYPE
4852 && TREE_CODE (*type
) != BOOLEAN_TYPE
4853 && TREE_CODE (*type
) != ENUMERAL_TYPE
)
4855 error ("bit-field %qs has invalid type", name
);
4856 *type
= unsigned_type_node
;
4859 type_mv
= TYPE_MAIN_VARIANT (*type
);
4860 if (!in_system_header_at (input_location
)
4861 && type_mv
!= integer_type_node
4862 && type_mv
!= unsigned_type_node
4863 && type_mv
!= boolean_type_node
4865 pedwarn (input_location
, OPT_Wpedantic
,
4866 "type of bit-field %qs is a GCC extension", name
);
4868 max_width
= TYPE_PRECISION (*type
);
4870 if (0 < compare_tree_int (*width
, max_width
))
4872 error ("width of %qs exceeds its type", name
);
4874 *width
= build_int_cst (integer_type_node
, w
);
4877 w
= tree_to_uhwi (*width
);
4879 if (TREE_CODE (*type
) == ENUMERAL_TYPE
)
4881 struct lang_type
*lt
= TYPE_LANG_SPECIFIC (*type
);
4883 || w
< tree_int_cst_min_precision (lt
->enum_min
, TYPE_SIGN (*type
))
4884 || w
< tree_int_cst_min_precision (lt
->enum_max
, TYPE_SIGN (*type
)))
4885 warning (0, "%qs is narrower than values of its type", name
);
4891 /* Print warning about variable length array if necessary. */
4894 warn_variable_length_array (tree name
, tree size
)
4896 int const_size
= TREE_CONSTANT (size
);
4898 if (!flag_isoc99
&& pedantic
&& warn_vla
!= 0)
4903 pedwarn (input_location
, OPT_Wvla
,
4904 "ISO C90 forbids array %qE whose size "
4905 "can%'t be evaluated",
4908 pedwarn (input_location
, OPT_Wvla
, "ISO C90 forbids array whose size "
4909 "can%'t be evaluated");
4914 pedwarn (input_location
, OPT_Wvla
,
4915 "ISO C90 forbids variable length array %qE",
4918 pedwarn (input_location
, OPT_Wvla
, "ISO C90 forbids variable length array");
4921 else if (warn_vla
> 0)
4927 "the size of array %qE can"
4928 "%'t be evaluated", name
);
4931 "the size of array can %'t be evaluated");
4937 "variable length array %qE is used",
4941 "variable length array is used");
4946 /* Given declspecs and a declarator,
4947 determine the name and type of the object declared
4948 and construct a ..._DECL node for it.
4949 (In one case we can return a ..._TYPE node instead.
4950 For invalid input we sometimes return 0.)
4952 DECLSPECS is a c_declspecs structure for the declaration specifiers.
4954 DECL_CONTEXT says which syntactic context this declaration is in:
4955 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
4956 FUNCDEF for a function definition. Like NORMAL but a few different
4957 error messages in each case. Return value may be zero meaning
4958 this definition is too screwy to try to parse.
4959 PARM for a parameter declaration (either within a function prototype
4960 or before a function body). Make a PARM_DECL, or return void_type_node.
4961 TYPENAME if for a typename (in a cast or sizeof).
4962 Don't make a DECL node; just return the ..._TYPE node.
4963 FIELD for a struct or union field; make a FIELD_DECL.
4964 INITIALIZED is true if the decl has an initializer.
4965 WIDTH is non-NULL for bit-fields, and is a pointer to an INTEGER_CST node
4966 representing the width of the bit-field.
4967 DECL_ATTRS points to the list of attributes that should be added to this
4968 decl. Any nested attributes that belong on the decl itself will be
4970 If EXPR is not NULL, any expressions that need to be evaluated as
4971 part of evaluating variably modified types will be stored in *EXPR.
4972 If EXPR_CONST_OPERANDS is not NULL, *EXPR_CONST_OPERANDS will be
4973 set to indicate whether operands in *EXPR can be used in constant
4975 DEPRECATED_STATE is a deprecated_states value indicating whether
4976 deprecation warnings should be suppressed.
4978 In the TYPENAME case, DECLARATOR is really an absolute declarator.
4979 It may also be so in the PARM case, for a prototype where the
4980 argument type is specified but not the name.
4982 This function is where the complicated C meanings of `static'
4983 and `extern' are interpreted. */
4986 grokdeclarator (const struct c_declarator
*declarator
,
4987 struct c_declspecs
*declspecs
,
4988 enum decl_context decl_context
, bool initialized
, tree
*width
,
4989 tree
*decl_attrs
, tree
*expr
, bool *expr_const_operands
,
4990 enum deprecated_states deprecated_state
)
4992 tree type
= declspecs
->type
;
4993 bool threadp
= declspecs
->thread_p
;
4994 enum c_storage_class storage_class
= declspecs
->storage_class
;
4999 int type_quals
= TYPE_UNQUALIFIED
;
5000 tree name
= NULL_TREE
;
5001 bool funcdef_flag
= false;
5002 bool funcdef_syntax
= false;
5003 bool size_varies
= false;
5004 tree decl_attr
= declspecs
->decl_attr
;
5005 int array_ptr_quals
= TYPE_UNQUALIFIED
;
5006 tree array_ptr_attrs
= NULL_TREE
;
5007 int array_parm_static
= 0;
5008 bool array_parm_vla_unspec_p
= false;
5009 tree returned_attrs
= NULL_TREE
;
5010 bool bitfield
= width
!= NULL
;
5012 struct c_arg_info
*arg_info
= 0;
5013 addr_space_t as1
, as2
, address_space
;
5014 location_t loc
= UNKNOWN_LOCATION
;
5017 bool expr_const_operands_dummy
;
5018 enum c_declarator_kind first_non_attr_kind
;
5019 unsigned int alignas_align
= 0;
5021 if (TREE_CODE (type
) == ERROR_MARK
)
5022 return error_mark_node
;
5025 if (expr_const_operands
== NULL
)
5026 expr_const_operands
= &expr_const_operands_dummy
;
5028 *expr
= declspecs
->expr
;
5029 *expr_const_operands
= declspecs
->expr_const_operands
;
5031 if (decl_context
== FUNCDEF
)
5032 funcdef_flag
= true, decl_context
= NORMAL
;
5034 /* Look inside a declarator for the name being declared
5035 and get it as an IDENTIFIER_NODE, for an error message. */
5037 const struct c_declarator
*decl
= declarator
;
5039 first_non_attr_kind
= cdk_attrs
;
5049 funcdef_syntax
= (decl
->kind
== cdk_function
);
5050 decl
= decl
->declarator
;
5051 if (first_non_attr_kind
== cdk_attrs
)
5052 first_non_attr_kind
= decl
->kind
;
5056 decl
= decl
->declarator
;
5063 if (first_non_attr_kind
== cdk_attrs
)
5064 first_non_attr_kind
= decl
->kind
;
5073 gcc_assert (decl_context
== PARM
5074 || decl_context
== TYPENAME
5075 || (decl_context
== FIELD
5076 && declarator
->kind
== cdk_id
));
5077 gcc_assert (!initialized
);
5081 /* A function definition's declarator must have the form of
5082 a function declarator. */
5084 if (funcdef_flag
&& !funcdef_syntax
)
5087 /* If this looks like a function definition, make it one,
5088 even if it occurs where parms are expected.
5089 Then store_parm_decls will reject it and not use it as a parm. */
5090 if (decl_context
== NORMAL
&& !funcdef_flag
&& current_scope
->parm_flag
)
5091 decl_context
= PARM
;
5093 if (declspecs
->deprecated_p
&& deprecated_state
!= DEPRECATED_SUPPRESS
)
5094 warn_deprecated_use (declspecs
->type
, declspecs
->decl_attr
);
5096 if ((decl_context
== NORMAL
|| decl_context
== FIELD
)
5097 && current_scope
== file_scope
5098 && variably_modified_type_p (type
, NULL_TREE
))
5101 error_at (loc
, "variably modified %qE at file scope", name
);
5103 error_at (loc
, "variably modified field at file scope");
5104 type
= integer_type_node
;
5107 size_varies
= C_TYPE_VARIABLE_SIZE (type
) != 0;
5109 /* Diagnose defaulting to "int". */
5111 if (declspecs
->default_int_p
&& !in_system_header_at (input_location
))
5113 /* Issue a warning if this is an ISO C 99 program or if
5114 -Wreturn-type and this is a function, or if -Wimplicit;
5115 prefer the former warning since it is more explicit. */
5116 if ((warn_implicit_int
|| warn_return_type
|| flag_isoc99
)
5118 warn_about_return_type
= 1;
5122 pedwarn_c99 (loc
, flag_isoc99
? 0 : OPT_Wimplicit_int
,
5123 "type defaults to %<int%> in declaration of %qE",
5126 pedwarn_c99 (input_location
, flag_isoc99
? 0 : OPT_Wimplicit_int
,
5127 "type defaults to %<int%> in type name");
5131 /* Adjust the type if a bit-field is being declared,
5132 -funsigned-bitfields applied and the type is not explicitly
5134 if (bitfield
&& !flag_signed_bitfields
&& !declspecs
->explicit_signed_p
5135 && TREE_CODE (type
) == INTEGER_TYPE
)
5136 type
= unsigned_type_for (type
);
5138 /* Figure out the type qualifiers for the declaration. There are
5139 two ways a declaration can become qualified. One is something
5140 like `const int i' where the `const' is explicit. Another is
5141 something like `typedef const int CI; CI i' where the type of the
5142 declaration contains the `const'. A third possibility is that
5143 there is a type qualifier on the element type of a typedefed
5144 array type, in which case we should extract that qualifier so
5145 that c_apply_type_quals_to_decl receives the full list of
5146 qualifiers to work with (C90 is not entirely clear about whether
5147 duplicate qualifiers should be diagnosed in this case, but it
5148 seems most appropriate to do so). */
5149 element_type
= strip_array_types (type
);
5150 constp
= declspecs
->const_p
+ TYPE_READONLY (element_type
);
5151 restrictp
= declspecs
->restrict_p
+ TYPE_RESTRICT (element_type
);
5152 volatilep
= declspecs
->volatile_p
+ TYPE_VOLATILE (element_type
);
5153 atomicp
= declspecs
->atomic_p
+ TYPE_ATOMIC (element_type
);
5154 as1
= declspecs
->address_space
;
5155 as2
= TYPE_ADDR_SPACE (element_type
);
5156 address_space
= ADDR_SPACE_GENERIC_P (as1
)? as2
: as1
;
5158 if (pedantic
&& !flag_isoc99
)
5161 pedwarn (loc
, OPT_Wpedantic
, "duplicate %<const%>");
5163 pedwarn (loc
, OPT_Wpedantic
, "duplicate %<restrict%>");
5165 pedwarn (loc
, OPT_Wpedantic
, "duplicate %<volatile%>");
5167 pedwarn (loc
, OPT_Wpedantic
, "duplicate %<_Atomic%>");
5171 if (!ADDR_SPACE_GENERIC_P (as1
) && !ADDR_SPACE_GENERIC_P (as2
) && as1
!= as2
)
5172 error_at (loc
, "conflicting named address spaces (%s vs %s)",
5173 c_addr_space_name (as1
), c_addr_space_name (as2
));
5175 if ((TREE_CODE (type
) == ARRAY_TYPE
5176 || first_non_attr_kind
== cdk_array
)
5177 && TYPE_QUALS (element_type
))
5178 type
= TYPE_MAIN_VARIANT (type
);
5179 type_quals
= ((constp
? TYPE_QUAL_CONST
: 0)
5180 | (restrictp
? TYPE_QUAL_RESTRICT
: 0)
5181 | (volatilep
? TYPE_QUAL_VOLATILE
: 0)
5182 | (atomicp
? TYPE_QUAL_ATOMIC
: 0)
5183 | ENCODE_QUAL_ADDR_SPACE (address_space
));
5185 /* Applying the _Atomic qualifier to an array type (through the use
5186 of typedefs or typeof) must be detected here. If the qualifier
5187 is introduced later, any appearance of applying it to an array is
5188 actually applying it to an element of that array. */
5189 if (atomicp
&& TREE_CODE (type
) == ARRAY_TYPE
)
5190 error_at (loc
, "%<_Atomic%>-qualified array type");
5192 /* Warn about storage classes that are invalid for certain
5193 kinds of declarations (parameters, typenames, etc.). */
5197 || storage_class
== csc_auto
5198 || storage_class
== csc_register
5199 || storage_class
== csc_typedef
))
5201 if (storage_class
== csc_auto
)
5203 (current_scope
== file_scope
) ? 0 : OPT_Wpedantic
,
5204 "function definition declared %<auto%>");
5205 if (storage_class
== csc_register
)
5206 error_at (loc
, "function definition declared %<register%>");
5207 if (storage_class
== csc_typedef
)
5208 error_at (loc
, "function definition declared %<typedef%>");
5210 error_at (loc
, "function definition declared %qs",
5211 declspecs
->thread_gnu_p
? "__thread" : "_Thread_local");
5213 if (storage_class
== csc_auto
5214 || storage_class
== csc_register
5215 || storage_class
== csc_typedef
)
5216 storage_class
= csc_none
;
5218 else if (decl_context
!= NORMAL
&& (storage_class
!= csc_none
|| threadp
))
5220 if (decl_context
== PARM
&& storage_class
== csc_register
)
5224 switch (decl_context
)
5228 error_at (loc
, "storage class specified for structure "
5231 error_at (loc
, "storage class specified for structure field");
5235 error_at (loc
, "storage class specified for parameter %qE",
5238 error_at (loc
, "storage class specified for unnamed parameter");
5241 error_at (loc
, "storage class specified for typename");
5244 storage_class
= csc_none
;
5248 else if (storage_class
== csc_extern
5252 /* 'extern' with initialization is invalid if not at file scope. */
5253 if (current_scope
== file_scope
)
5255 /* It is fine to have 'extern const' when compiling at C
5256 and C++ intersection. */
5257 if (!(warn_cxx_compat
&& constp
))
5258 warning_at (loc
, 0, "%qE initialized and declared %<extern%>",
5262 error_at (loc
, "%qE has both %<extern%> and initializer", name
);
5264 else if (current_scope
== file_scope
)
5266 if (storage_class
== csc_auto
)
5267 error_at (loc
, "file-scope declaration of %qE specifies %<auto%>",
5269 if (pedantic
&& storage_class
== csc_register
)
5270 pedwarn (input_location
, OPT_Wpedantic
,
5271 "file-scope declaration of %qE specifies %<register%>", name
);
5275 if (storage_class
== csc_extern
&& funcdef_flag
)
5276 error_at (loc
, "nested function %qE declared %<extern%>", name
);
5277 else if (threadp
&& storage_class
== csc_none
)
5279 error_at (loc
, "function-scope %qE implicitly auto and declared "
5281 declspecs
->thread_gnu_p
? "__thread" : "_Thread_local");
5286 /* Now figure out the structure of the declarator proper.
5287 Descend through it, creating more complex types, until we reach
5288 the declared identifier (or NULL_TREE, in an absolute declarator).
5289 At each stage we maintain an unqualified version of the type
5290 together with any qualifiers that should be applied to it with
5291 c_build_qualified_type; this way, array types including
5292 multidimensional array types are first built up in unqualified
5293 form and then the qualified form is created with
5294 TYPE_MAIN_VARIANT pointing to the unqualified form. */
5296 while (declarator
&& declarator
->kind
!= cdk_id
)
5298 if (type
== error_mark_node
)
5300 declarator
= declarator
->declarator
;
5304 /* Each level of DECLARATOR is either a cdk_array (for ...[..]),
5305 a cdk_pointer (for *...),
5306 a cdk_function (for ...(...)),
5307 a cdk_attrs (for nested attributes),
5308 or a cdk_id (for the name being declared
5309 or the place in an absolute declarator
5310 where the name was omitted).
5311 For the last case, we have just exited the loop.
5313 At this point, TYPE is the type of elements of an array,
5314 or for a function to return, or for a pointer to point to.
5315 After this sequence of ifs, TYPE is the type of the
5316 array or function or pointer, and DECLARATOR has had its
5317 outermost layer removed. */
5319 if (array_ptr_quals
!= TYPE_UNQUALIFIED
5320 || array_ptr_attrs
!= NULL_TREE
5321 || array_parm_static
)
5323 /* Only the innermost declarator (making a parameter be of
5324 array type which is converted to pointer type)
5325 may have static or type qualifiers. */
5326 error_at (loc
, "static or type qualifiers in non-parameter array declarator");
5327 array_ptr_quals
= TYPE_UNQUALIFIED
;
5328 array_ptr_attrs
= NULL_TREE
;
5329 array_parm_static
= 0;
5332 switch (declarator
->kind
)
5336 /* A declarator with embedded attributes. */
5337 tree attrs
= declarator
->u
.attrs
;
5338 const struct c_declarator
*inner_decl
;
5340 declarator
= declarator
->declarator
;
5341 inner_decl
= declarator
;
5342 while (inner_decl
->kind
== cdk_attrs
)
5343 inner_decl
= inner_decl
->declarator
;
5344 if (inner_decl
->kind
== cdk_id
)
5345 attr_flags
|= (int) ATTR_FLAG_DECL_NEXT
;
5346 else if (inner_decl
->kind
== cdk_function
)
5347 attr_flags
|= (int) ATTR_FLAG_FUNCTION_NEXT
;
5348 else if (inner_decl
->kind
== cdk_array
)
5349 attr_flags
|= (int) ATTR_FLAG_ARRAY_NEXT
;
5350 returned_attrs
= decl_attributes (&type
,
5351 chainon (returned_attrs
, attrs
),
5357 tree itype
= NULL_TREE
;
5358 tree size
= declarator
->u
.array
.dimen
;
5359 /* The index is a signed object `sizetype' bits wide. */
5360 tree index_type
= c_common_signed_type (sizetype
);
5362 array_ptr_quals
= declarator
->u
.array
.quals
;
5363 array_ptr_attrs
= declarator
->u
.array
.attrs
;
5364 array_parm_static
= declarator
->u
.array
.static_p
;
5365 array_parm_vla_unspec_p
= declarator
->u
.array
.vla_unspec_p
;
5367 declarator
= declarator
->declarator
;
5369 /* Check for some types that there cannot be arrays of. */
5371 if (VOID_TYPE_P (type
))
5374 error_at (loc
, "declaration of %qE as array of voids", name
);
5376 error_at (loc
, "declaration of type name as array of voids");
5377 type
= error_mark_node
;
5380 if (TREE_CODE (type
) == FUNCTION_TYPE
)
5383 error_at (loc
, "declaration of %qE as array of functions",
5386 error_at (loc
, "declaration of type name as array of "
5388 type
= error_mark_node
;
5391 if (pedantic
&& !in_system_header_at (input_location
)
5392 && flexible_array_type_p (type
))
5393 pedwarn (loc
, OPT_Wpedantic
,
5394 "invalid use of structure with flexible array member");
5396 if (size
== error_mark_node
)
5397 type
= error_mark_node
;
5399 if (type
== error_mark_node
)
5402 /* If size was specified, set ITYPE to a range-type for
5403 that size. Otherwise, ITYPE remains null. finish_decl
5404 may figure it out from an initial value. */
5408 bool size_maybe_const
= true;
5409 bool size_int_const
= (TREE_CODE (size
) == INTEGER_CST
5410 && !TREE_OVERFLOW (size
));
5411 bool this_size_varies
= false;
5413 /* Strip NON_LVALUE_EXPRs since we aren't using as an
5415 STRIP_TYPE_NOPS (size
);
5417 if (!INTEGRAL_TYPE_P (TREE_TYPE (size
)))
5420 error_at (loc
, "size of array %qE has non-integer type",
5424 "size of unnamed array has non-integer type");
5425 size
= integer_one_node
;
5428 size
= c_fully_fold (size
, false, &size_maybe_const
);
5430 if (pedantic
&& size_maybe_const
&& integer_zerop (size
))
5433 pedwarn (loc
, OPT_Wpedantic
,
5434 "ISO C forbids zero-size array %qE", name
);
5436 pedwarn (loc
, OPT_Wpedantic
,
5437 "ISO C forbids zero-size array");
5440 if (TREE_CODE (size
) == INTEGER_CST
&& size_maybe_const
)
5442 constant_expression_warning (size
);
5443 if (tree_int_cst_sgn (size
) < 0)
5446 error_at (loc
, "size of array %qE is negative", name
);
5448 error_at (loc
, "size of unnamed array is negative");
5449 size
= integer_one_node
;
5451 /* Handle a size folded to an integer constant but
5452 not an integer constant expression. */
5453 if (!size_int_const
)
5455 /* If this is a file scope declaration of an
5456 ordinary identifier, this is invalid code;
5457 diagnosing it here and not subsequently
5458 treating the type as variable-length avoids
5459 more confusing diagnostics later. */
5460 if ((decl_context
== NORMAL
|| decl_context
== FIELD
)
5461 && current_scope
== file_scope
)
5462 pedwarn (input_location
, 0,
5463 "variably modified %qE at file scope",
5466 this_size_varies
= size_varies
= true;
5467 warn_variable_length_array (name
, size
);
5470 else if ((decl_context
== NORMAL
|| decl_context
== FIELD
)
5471 && current_scope
== file_scope
)
5473 error_at (loc
, "variably modified %qE at file scope", name
);
5474 size
= integer_one_node
;
5478 /* Make sure the array size remains visibly
5479 nonconstant even if it is (eg) a const variable
5480 with known value. */
5481 this_size_varies
= size_varies
= true;
5482 warn_variable_length_array (name
, size
);
5483 if (flag_sanitize
& SANITIZE_VLA
5484 && decl_context
== NORMAL
)
5486 /* Evaluate the array size only once. */
5487 size
= c_save_expr (size
);
5488 size
= c_fully_fold (size
, false, NULL
);
5489 size
= fold_build2 (COMPOUND_EXPR
, TREE_TYPE (size
),
5490 ubsan_instrument_vla (loc
, size
),
5495 if (integer_zerop (size
) && !this_size_varies
)
5497 /* A zero-length array cannot be represented with
5498 an unsigned index type, which is what we'll
5499 get with build_index_type. Create an
5500 open-ended range instead. */
5501 itype
= build_range_type (sizetype
, size
, NULL_TREE
);
5505 /* Arrange for the SAVE_EXPR on the inside of the
5506 MINUS_EXPR, which allows the -1 to get folded
5507 with the +1 that happens when building TYPE_SIZE. */
5509 size
= save_expr (size
);
5510 if (this_size_varies
&& TREE_CODE (size
) == INTEGER_CST
)
5511 size
= build2 (COMPOUND_EXPR
, TREE_TYPE (size
),
5512 integer_zero_node
, size
);
5514 /* Compute the maximum valid index, that is, size
5515 - 1. Do the calculation in index_type, so that
5516 if it is a variable the computations will be
5517 done in the proper mode. */
5518 itype
= fold_build2_loc (loc
, MINUS_EXPR
, index_type
,
5519 convert (index_type
, size
),
5520 convert (index_type
,
5523 /* The above overflows when size does not fit
5525 ??? While a size of INT_MAX+1 technically shouldn't
5526 cause an overflow (because we subtract 1), handling
5527 this case seems like an unnecessary complication. */
5528 if (TREE_CODE (size
) == INTEGER_CST
5529 && !int_fits_type_p (size
, index_type
))
5532 error_at (loc
, "size of array %qE is too large",
5535 error_at (loc
, "size of unnamed array is too large");
5536 type
= error_mark_node
;
5540 itype
= build_index_type (itype
);
5542 if (this_size_varies
)
5545 *expr
= build2 (COMPOUND_EXPR
, TREE_TYPE (size
),
5549 *expr_const_operands
&= size_maybe_const
;
5552 else if (decl_context
== FIELD
)
5554 bool flexible_array_member
= false;
5555 if (array_parm_vla_unspec_p
)
5556 /* Field names can in fact have function prototype
5557 scope so [*] is disallowed here through making
5558 the field variably modified, not through being
5559 something other than a declaration with function
5564 const struct c_declarator
*t
= declarator
;
5565 while (t
->kind
== cdk_attrs
)
5567 flexible_array_member
= (t
->kind
== cdk_id
);
5569 if (flexible_array_member
5570 && pedantic
&& !flag_isoc99
5571 && !in_system_header_at (input_location
))
5572 pedwarn (loc
, OPT_Wpedantic
,
5573 "ISO C90 does not support flexible array members");
5575 /* ISO C99 Flexible array members are effectively
5576 identical to GCC's zero-length array extension. */
5577 if (flexible_array_member
|| array_parm_vla_unspec_p
)
5578 itype
= build_range_type (sizetype
, size_zero_node
,
5581 else if (decl_context
== PARM
)
5583 if (array_parm_vla_unspec_p
)
5585 itype
= build_range_type (sizetype
, size_zero_node
, NULL_TREE
);
5589 else if (decl_context
== TYPENAME
)
5591 if (array_parm_vla_unspec_p
)
5594 warning (0, "%<[*]%> not in a declaration");
5595 /* We use this to avoid messing up with incomplete
5596 array types of the same type, that would
5597 otherwise be modified below. */
5598 itype
= build_range_type (sizetype
, size_zero_node
,
5604 /* Complain about arrays of incomplete types. */
5605 if (!COMPLETE_TYPE_P (type
))
5607 error_at (loc
, "array type has incomplete element type");
5608 type
= error_mark_node
;
5611 /* When itype is NULL, a shared incomplete array type is
5612 returned for all array of a given type. Elsewhere we
5613 make sure we don't complete that type before copying
5614 it, but here we want to make sure we don't ever
5615 modify the shared type, so we gcc_assert (itype)
5618 addr_space_t as
= DECODE_QUAL_ADDR_SPACE (type_quals
);
5619 if (!ADDR_SPACE_GENERIC_P (as
) && as
!= TYPE_ADDR_SPACE (type
))
5620 type
= build_qualified_type (type
,
5621 ENCODE_QUAL_ADDR_SPACE (as
));
5623 type
= build_array_type (type
, itype
);
5626 if (type
!= error_mark_node
)
5630 /* It is ok to modify type here even if itype is
5631 NULL: if size_varies, we're in a
5632 multi-dimensional array and the inner type has
5633 variable size, so the enclosing shared array type
5635 if (size
&& TREE_CODE (size
) == INTEGER_CST
)
5637 = build_distinct_type_copy (TYPE_MAIN_VARIANT (type
));
5638 C_TYPE_VARIABLE_SIZE (type
) = 1;
5641 /* The GCC extension for zero-length arrays differs from
5642 ISO flexible array members in that sizeof yields
5644 if (size
&& integer_zerop (size
))
5647 type
= build_distinct_type_copy (TYPE_MAIN_VARIANT (type
));
5648 TYPE_SIZE (type
) = bitsize_zero_node
;
5649 TYPE_SIZE_UNIT (type
) = size_zero_node
;
5650 SET_TYPE_STRUCTURAL_EQUALITY (type
);
5652 if (array_parm_vla_unspec_p
)
5655 /* The type is complete. C99 6.7.5.2p4 */
5656 type
= build_distinct_type_copy (TYPE_MAIN_VARIANT (type
));
5657 TYPE_SIZE (type
) = bitsize_zero_node
;
5658 TYPE_SIZE_UNIT (type
) = size_zero_node
;
5659 SET_TYPE_STRUCTURAL_EQUALITY (type
);
5663 if (decl_context
!= PARM
5664 && (array_ptr_quals
!= TYPE_UNQUALIFIED
5665 || array_ptr_attrs
!= NULL_TREE
5666 || array_parm_static
))
5668 error_at (loc
, "static or type qualifiers in non-parameter array declarator");
5669 array_ptr_quals
= TYPE_UNQUALIFIED
;
5670 array_ptr_attrs
= NULL_TREE
;
5671 array_parm_static
= 0;
5677 /* Say it's a definition only for the declarator closest
5678 to the identifier, apart possibly from some
5680 bool really_funcdef
= false;
5684 const struct c_declarator
*t
= declarator
->declarator
;
5685 while (t
->kind
== cdk_attrs
)
5687 really_funcdef
= (t
->kind
== cdk_id
);
5690 /* Declaring a function type. Make sure we have a valid
5691 type for the function to return. */
5692 if (type
== error_mark_node
)
5695 size_varies
= false;
5697 /* Warn about some types functions can't return. */
5698 if (TREE_CODE (type
) == FUNCTION_TYPE
)
5701 error_at (loc
, "%qE declared as function returning a "
5704 error_at (loc
, "type name declared as function "
5705 "returning a function");
5706 type
= integer_type_node
;
5708 if (TREE_CODE (type
) == ARRAY_TYPE
)
5711 error_at (loc
, "%qE declared as function returning an array",
5714 error_at (loc
, "type name declared as function returning "
5716 type
= integer_type_node
;
5718 errmsg
= targetm
.invalid_return_type (type
);
5722 type
= integer_type_node
;
5725 /* Construct the function type and go to the next
5726 inner layer of declarator. */
5727 arg_info
= declarator
->u
.arg_info
;
5728 arg_types
= grokparms (arg_info
, really_funcdef
);
5730 /* Type qualifiers before the return type of the function
5731 qualify the return type, not the function type. */
5734 /* Type qualifiers on a function return type are
5735 normally permitted by the standard but have no
5736 effect, so give a warning at -Wreturn-type.
5737 Qualifiers on a void return type are banned on
5738 function definitions in ISO C; GCC used to used
5739 them for noreturn functions. */
5740 if (VOID_TYPE_P (type
) && really_funcdef
)
5742 "function definition has qualified void return type");
5744 warning_at (loc
, OPT_Wignored_qualifiers
,
5745 "type qualifiers ignored on function return type");
5747 type
= c_build_qualified_type (type
, type_quals
);
5749 type_quals
= TYPE_UNQUALIFIED
;
5751 type
= build_function_type (type
, arg_types
);
5752 declarator
= declarator
->declarator
;
5754 /* Set the TYPE_CONTEXTs for each tagged type which is local to
5755 the formal parameter list of this FUNCTION_TYPE to point to
5756 the FUNCTION_TYPE node itself. */
5761 FOR_EACH_VEC_SAFE_ELT_REVERSE (arg_info
->tags
, ix
, tag
)
5762 TYPE_CONTEXT (tag
->type
) = type
;
5768 /* Merge any constancy or volatility into the target type
5770 if ((type_quals
& TYPE_QUAL_ATOMIC
)
5771 && TREE_CODE (type
) == FUNCTION_TYPE
)
5774 "%<_Atomic%>-qualified function type");
5775 type_quals
&= ~TYPE_QUAL_ATOMIC
;
5777 else if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
5779 pedwarn (loc
, OPT_Wpedantic
,
5780 "ISO C forbids qualified function types");
5782 type
= c_build_qualified_type (type
, type_quals
);
5783 size_varies
= false;
5785 /* When the pointed-to type involves components of variable size,
5786 care must be taken to ensure that the size evaluation code is
5787 emitted early enough to dominate all the possible later uses
5788 and late enough for the variables on which it depends to have
5791 This is expected to happen automatically when the pointed-to
5792 type has a name/declaration of it's own, but special attention
5793 is required if the type is anonymous.
5795 We handle the NORMAL and FIELD contexts here by attaching an
5796 artificial TYPE_DECL to such pointed-to type. This forces the
5797 sizes evaluation at a safe point and ensures it is not deferred
5798 until e.g. within a deeper conditional context.
5800 We expect nothing to be needed here for PARM or TYPENAME.
5801 Pushing a TYPE_DECL at this point for TYPENAME would actually
5802 be incorrect, as we might be in the middle of an expression
5803 with side effects on the pointed-to type size "arguments" prior
5804 to the pointer declaration point and the fake TYPE_DECL in the
5805 enclosing context would force the size evaluation prior to the
5808 if (!TYPE_NAME (type
)
5809 && (decl_context
== NORMAL
|| decl_context
== FIELD
)
5810 && variably_modified_type_p (type
, NULL_TREE
))
5812 tree decl
= build_decl (loc
, TYPE_DECL
, NULL_TREE
, type
);
5813 DECL_ARTIFICIAL (decl
) = 1;
5815 finish_decl (decl
, loc
, NULL_TREE
, NULL_TREE
, NULL_TREE
);
5816 TYPE_NAME (type
) = decl
;
5819 type
= c_build_pointer_type (type
);
5821 /* Process type qualifiers (such as const or volatile)
5822 that were given inside the `*'. */
5823 type_quals
= declarator
->u
.pointer_quals
;
5825 declarator
= declarator
->declarator
;
5832 *decl_attrs
= chainon (returned_attrs
, *decl_attrs
);
5834 /* Now TYPE has the actual type, apart from any qualifiers in
5837 /* Warn about address space used for things other than static memory or
5839 address_space
= DECODE_QUAL_ADDR_SPACE (type_quals
);
5840 if (!ADDR_SPACE_GENERIC_P (address_space
))
5842 if (decl_context
== NORMAL
)
5844 switch (storage_class
)
5847 error ("%qs combined with %<auto%> qualifier for %qE",
5848 c_addr_space_name (address_space
), name
);
5851 error ("%qs combined with %<register%> qualifier for %qE",
5852 c_addr_space_name (address_space
), name
);
5855 if (current_function_scope
)
5857 error ("%qs specified for auto variable %qE",
5858 c_addr_space_name (address_space
), name
);
5870 else if (decl_context
== PARM
&& TREE_CODE (type
) != ARRAY_TYPE
)
5873 error ("%qs specified for parameter %qE",
5874 c_addr_space_name (address_space
), name
);
5876 error ("%qs specified for unnamed parameter",
5877 c_addr_space_name (address_space
));
5879 else if (decl_context
== FIELD
)
5882 error ("%qs specified for structure field %qE",
5883 c_addr_space_name (address_space
), name
);
5885 error ("%qs specified for structure field",
5886 c_addr_space_name (address_space
));
5890 /* Check the type and width of a bit-field. */
5893 check_bitfield_type_and_width (&type
, width
, name
);
5894 /* C11 makes it implementation-defined (6.7.2.1#5) whether
5895 atomic types are permitted for bit-fields; we have no code to
5896 make bit-field accesses atomic, so disallow them. */
5897 if (type_quals
& TYPE_QUAL_ATOMIC
)
5900 error ("bit-field %qE has atomic type", name
);
5902 error ("bit-field has atomic type");
5903 type_quals
&= ~TYPE_QUAL_ATOMIC
;
5907 /* Reject invalid uses of _Alignas. */
5908 if (declspecs
->alignas_p
)
5910 if (storage_class
== csc_typedef
)
5911 error_at (loc
, "alignment specified for typedef %qE", name
);
5912 else if (storage_class
== csc_register
)
5913 error_at (loc
, "alignment specified for %<register%> object %qE",
5915 else if (decl_context
== PARM
)
5918 error_at (loc
, "alignment specified for parameter %qE", name
);
5920 error_at (loc
, "alignment specified for unnamed parameter");
5925 error_at (loc
, "alignment specified for bit-field %qE", name
);
5927 error_at (loc
, "alignment specified for unnamed bit-field");
5929 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
5930 error_at (loc
, "alignment specified for function %qE", name
);
5931 else if (declspecs
->align_log
!= -1)
5933 alignas_align
= 1U << declspecs
->align_log
;
5934 if (alignas_align
< min_align_of_type (type
))
5937 error_at (loc
, "%<_Alignas%> specifiers cannot reduce "
5938 "alignment of %qE", name
);
5940 error_at (loc
, "%<_Alignas%> specifiers cannot reduce "
5941 "alignment of unnamed field");
5947 /* Did array size calculations overflow or does the array cover more
5948 than half of the address-space? */
5949 if (TREE_CODE (type
) == ARRAY_TYPE
5950 && COMPLETE_TYPE_P (type
)
5951 && TREE_CODE (TYPE_SIZE_UNIT (type
)) == INTEGER_CST
5952 && ! valid_constant_size_p (TYPE_SIZE_UNIT (type
)))
5955 error_at (loc
, "size of array %qE is too large", name
);
5957 error_at (loc
, "size of unnamed array is too large");
5958 /* If we proceed with the array type as it is, we'll eventually
5959 crash in tree_to_[su]hwi(). */
5960 type
= error_mark_node
;
5963 /* If this is declaring a typedef name, return a TYPE_DECL. */
5965 if (storage_class
== csc_typedef
)
5968 if ((type_quals
& TYPE_QUAL_ATOMIC
)
5969 && TREE_CODE (type
) == FUNCTION_TYPE
)
5972 "%<_Atomic%>-qualified function type");
5973 type_quals
&= ~TYPE_QUAL_ATOMIC
;
5975 else if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
5977 pedwarn (loc
, OPT_Wpedantic
,
5978 "ISO C forbids qualified function types");
5980 type
= c_build_qualified_type (type
, type_quals
);
5981 decl
= build_decl (declarator
->id_loc
,
5982 TYPE_DECL
, declarator
->u
.id
, type
);
5983 if (declspecs
->explicit_signed_p
)
5984 C_TYPEDEF_EXPLICITLY_SIGNED (decl
) = 1;
5985 if (declspecs
->inline_p
)
5986 pedwarn (loc
, 0,"typedef %q+D declared %<inline%>", decl
);
5987 if (declspecs
->noreturn_p
)
5988 pedwarn (loc
, 0,"typedef %q+D declared %<_Noreturn%>", decl
);
5990 if (warn_cxx_compat
&& declarator
->u
.id
!= NULL_TREE
)
5992 struct c_binding
*b
= I_TAG_BINDING (declarator
->u
.id
);
5995 && b
->decl
!= NULL_TREE
5996 && (B_IN_CURRENT_SCOPE (b
)
5997 || (current_scope
== file_scope
&& B_IN_EXTERNAL_SCOPE (b
)))
5998 && TYPE_MAIN_VARIANT (b
->decl
) != TYPE_MAIN_VARIANT (type
))
6000 warning_at (declarator
->id_loc
, OPT_Wc___compat
,
6001 ("using %qD as both a typedef and a tag is "
6004 if (b
->locus
!= UNKNOWN_LOCATION
)
6005 inform (b
->locus
, "originally defined here");
6012 /* If this is a type name (such as, in a cast or sizeof),
6013 compute the type and return it now. */
6015 if (decl_context
== TYPENAME
)
6017 /* Note that the grammar rejects storage classes in typenames
6019 gcc_assert (storage_class
== csc_none
&& !threadp
6020 && !declspecs
->inline_p
&& !declspecs
->noreturn_p
);
6021 if ((type_quals
& TYPE_QUAL_ATOMIC
)
6022 && TREE_CODE (type
) == FUNCTION_TYPE
)
6025 "%<_Atomic%>-qualified function type");
6026 type_quals
&= ~TYPE_QUAL_ATOMIC
;
6028 else if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
6030 pedwarn (loc
, OPT_Wpedantic
,
6031 "ISO C forbids const or volatile function types");
6033 type
= c_build_qualified_type (type
, type_quals
);
6037 if (pedantic
&& decl_context
== FIELD
6038 && variably_modified_type_p (type
, NULL_TREE
))
6041 pedwarn (loc
, OPT_Wpedantic
, "a member of a structure or union cannot "
6042 "have a variably modified type");
6045 /* Aside from typedefs and type names (handle above),
6046 `void' at top level (not within pointer)
6047 is allowed only in public variables.
6048 We don't complain about parms either, but that is because
6049 a better error message can be made later. */
6051 if (VOID_TYPE_P (type
) && decl_context
!= PARM
6052 && !((decl_context
!= FIELD
&& TREE_CODE (type
) != FUNCTION_TYPE
)
6053 && (storage_class
== csc_extern
6054 || (current_scope
== file_scope
6055 && !(storage_class
== csc_static
6056 || storage_class
== csc_register
)))))
6058 error_at (loc
, "variable or field %qE declared void", name
);
6059 type
= integer_type_node
;
6062 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
6063 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
6068 if (decl_context
== PARM
)
6072 /* A parameter declared as an array of T is really a pointer to T.
6073 One declared as a function is really a pointer to a function. */
6075 if (TREE_CODE (type
) == ARRAY_TYPE
)
6077 /* Transfer const-ness of array into that of type pointed to. */
6078 type
= TREE_TYPE (type
);
6080 type
= c_build_qualified_type (type
, type_quals
);
6081 type
= c_build_pointer_type (type
);
6082 type_quals
= array_ptr_quals
;
6084 type
= c_build_qualified_type (type
, type_quals
);
6086 /* We don't yet implement attributes in this context. */
6087 if (array_ptr_attrs
!= NULL_TREE
)
6088 warning_at (loc
, OPT_Wattributes
,
6089 "attributes in parameter array declarator ignored");
6091 size_varies
= false;
6093 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
6095 if (type_quals
& TYPE_QUAL_ATOMIC
)
6098 "%<_Atomic%>-qualified function type");
6099 type_quals
&= ~TYPE_QUAL_ATOMIC
;
6101 else if (type_quals
)
6102 pedwarn (loc
, OPT_Wpedantic
,
6103 "ISO C forbids qualified function types");
6105 type
= c_build_qualified_type (type
, type_quals
);
6106 type
= c_build_pointer_type (type
);
6107 type_quals
= TYPE_UNQUALIFIED
;
6109 else if (type_quals
)
6110 type
= c_build_qualified_type (type
, type_quals
);
6112 decl
= build_decl (declarator
->id_loc
,
6113 PARM_DECL
, declarator
->u
.id
, type
);
6115 C_DECL_VARIABLE_SIZE (decl
) = 1;
6117 /* Compute the type actually passed in the parmlist,
6118 for the case where there is no prototype.
6119 (For example, shorts and chars are passed as ints.)
6120 When there is a prototype, this is overridden later. */
6122 if (type
== error_mark_node
)
6123 promoted_type
= type
;
6125 promoted_type
= c_type_promotes_to (type
);
6127 DECL_ARG_TYPE (decl
) = promoted_type
;
6128 if (declspecs
->inline_p
)
6129 pedwarn (loc
, 0, "parameter %q+D declared %<inline%>", decl
);
6130 if (declspecs
->noreturn_p
)
6131 pedwarn (loc
, 0, "parameter %q+D declared %<_Noreturn%>", decl
);
6133 else if (decl_context
== FIELD
)
6135 /* Note that the grammar rejects storage classes in typenames
6137 gcc_assert (storage_class
== csc_none
&& !threadp
6138 && !declspecs
->inline_p
&& !declspecs
->noreturn_p
);
6140 /* Structure field. It may not be a function. */
6142 if (TREE_CODE (type
) == FUNCTION_TYPE
)
6144 error_at (loc
, "field %qE declared as a function", name
);
6145 type
= build_pointer_type (type
);
6147 else if (TREE_CODE (type
) != ERROR_MARK
6148 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type
))
6151 error_at (loc
, "field %qE has incomplete type", name
);
6153 error_at (loc
, "unnamed field has incomplete type");
6154 type
= error_mark_node
;
6156 type
= c_build_qualified_type (type
, type_quals
);
6157 decl
= build_decl (declarator
->id_loc
,
6158 FIELD_DECL
, declarator
->u
.id
, type
);
6159 DECL_NONADDRESSABLE_P (decl
) = bitfield
;
6160 if (bitfield
&& !declarator
->u
.id
)
6161 TREE_NO_WARNING (decl
) = 1;
6164 C_DECL_VARIABLE_SIZE (decl
) = 1;
6166 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
6168 if (storage_class
== csc_register
|| threadp
)
6170 error_at (loc
, "invalid storage class for function %qE", name
);
6172 else if (current_scope
!= file_scope
)
6174 /* Function declaration not at file scope. Storage
6175 classes other than `extern' are not allowed, C99
6176 6.7.1p5, and `extern' makes no difference. However,
6177 GCC allows 'auto', perhaps with 'inline', to support
6178 nested functions. */
6179 if (storage_class
== csc_auto
)
6180 pedwarn (loc
, OPT_Wpedantic
,
6181 "invalid storage class for function %qE", name
);
6182 else if (storage_class
== csc_static
)
6184 error_at (loc
, "invalid storage class for function %qE", name
);
6186 storage_class
= declspecs
->storage_class
= csc_none
;
6192 decl
= build_decl (declarator
->id_loc
,
6193 FUNCTION_DECL
, declarator
->u
.id
, type
);
6194 decl
= build_decl_attribute_variant (decl
, decl_attr
);
6196 if (type_quals
& TYPE_QUAL_ATOMIC
)
6199 "%<_Atomic%>-qualified function type");
6200 type_quals
&= ~TYPE_QUAL_ATOMIC
;
6202 else if (pedantic
&& type_quals
&& !DECL_IN_SYSTEM_HEADER (decl
))
6203 pedwarn (loc
, OPT_Wpedantic
,
6204 "ISO C forbids qualified function types");
6206 /* Every function declaration is an external reference
6207 (DECL_EXTERNAL) except for those which are not at file
6208 scope and are explicitly declared "auto". This is
6209 forbidden by standard C (C99 6.7.1p5) and is interpreted by
6210 GCC to signify a forward declaration of a nested function. */
6211 if (storage_class
== csc_auto
&& current_scope
!= file_scope
)
6212 DECL_EXTERNAL (decl
) = 0;
6213 /* In C99, a function which is declared 'inline' with 'extern'
6214 is not an external reference (which is confusing). It
6215 means that the later definition of the function must be output
6216 in this file, C99 6.7.4p6. In GNU C89, a function declared
6217 'extern inline' is an external reference. */
6218 else if (declspecs
->inline_p
&& storage_class
!= csc_static
)
6219 DECL_EXTERNAL (decl
) = ((storage_class
== csc_extern
)
6220 == flag_gnu89_inline
);
6222 DECL_EXTERNAL (decl
) = !initialized
;
6224 /* Record absence of global scope for `static' or `auto'. */
6226 = !(storage_class
== csc_static
|| storage_class
== csc_auto
);
6228 /* For a function definition, record the argument information
6229 block where store_parm_decls will look for it. */
6231 current_function_arg_info
= arg_info
;
6233 if (declspecs
->default_int_p
)
6234 C_FUNCTION_IMPLICIT_INT (decl
) = 1;
6236 /* Record presence of `inline' and `_Noreturn', if it is
6238 if (flag_hosted
&& MAIN_NAME_P (declarator
->u
.id
))
6240 if (declspecs
->inline_p
)
6241 pedwarn (loc
, 0, "cannot inline function %<main%>");
6242 if (declspecs
->noreturn_p
)
6243 pedwarn (loc
, 0, "%<main%> declared %<_Noreturn%>");
6247 if (declspecs
->inline_p
)
6248 /* Record that the function is declared `inline'. */
6249 DECL_DECLARED_INLINE_P (decl
) = 1;
6250 if (declspecs
->noreturn_p
)
6255 pedwarn (loc
, OPT_Wpedantic
,
6256 "ISO C99 does not support %<_Noreturn%>");
6258 pedwarn (loc
, OPT_Wpedantic
,
6259 "ISO C90 does not support %<_Noreturn%>");
6261 TREE_THIS_VOLATILE (decl
) = 1;
6267 /* It's a variable. */
6268 /* An uninitialized decl with `extern' is a reference. */
6269 int extern_ref
= !initialized
&& storage_class
== csc_extern
;
6271 type
= c_build_qualified_type (type
, type_quals
);
6273 /* C99 6.2.2p7: It is invalid (compile-time undefined
6274 behavior) to create an 'extern' declaration for a
6275 variable if there is a global declaration that is
6276 'static' and the global declaration is not visible.
6277 (If the static declaration _is_ currently visible,
6278 the 'extern' declaration is taken to refer to that decl.) */
6279 if (extern_ref
&& current_scope
!= file_scope
)
6281 tree global_decl
= identifier_global_value (declarator
->u
.id
);
6282 tree visible_decl
= lookup_name (declarator
->u
.id
);
6285 && global_decl
!= visible_decl
6286 && TREE_CODE (global_decl
) == VAR_DECL
6287 && !TREE_PUBLIC (global_decl
))
6288 error_at (loc
, "variable previously declared %<static%> "
6289 "redeclared %<extern%>");
6292 decl
= build_decl (declarator
->id_loc
,
6293 VAR_DECL
, declarator
->u
.id
, type
);
6295 C_DECL_VARIABLE_SIZE (decl
) = 1;
6297 if (declspecs
->inline_p
)
6298 pedwarn (loc
, 0, "variable %q+D declared %<inline%>", decl
);
6299 if (declspecs
->noreturn_p
)
6300 pedwarn (loc
, 0, "variable %q+D declared %<_Noreturn%>", decl
);
6302 /* At file scope, an initialized extern declaration may follow
6303 a static declaration. In that case, DECL_EXTERNAL will be
6304 reset later in start_decl. */
6305 DECL_EXTERNAL (decl
) = (storage_class
== csc_extern
);
6307 /* At file scope, the presence of a `static' or `register' storage
6308 class specifier, or the absence of all storage class specifiers
6309 makes this declaration a definition (perhaps tentative). Also,
6310 the absence of `static' makes it public. */
6311 if (current_scope
== file_scope
)
6313 TREE_PUBLIC (decl
) = storage_class
!= csc_static
;
6314 TREE_STATIC (decl
) = !extern_ref
;
6316 /* Not at file scope, only `static' makes a static definition. */
6319 TREE_STATIC (decl
) = (storage_class
== csc_static
);
6320 TREE_PUBLIC (decl
) = extern_ref
;
6324 DECL_TLS_MODEL (decl
) = decl_default_tls_model (decl
);
6327 if ((storage_class
== csc_extern
6328 || (storage_class
== csc_none
6329 && TREE_CODE (type
) == FUNCTION_TYPE
6331 && variably_modified_type_p (type
, NULL_TREE
))
6334 if (TREE_CODE (type
) == FUNCTION_TYPE
)
6335 error_at (loc
, "non-nested function with variably modified type");
6337 error_at (loc
, "object with variably modified type must have "
6341 /* Record `register' declaration for warnings on &
6342 and in case doing stupid register allocation. */
6344 if (storage_class
== csc_register
)
6346 C_DECL_REGISTER (decl
) = 1;
6347 DECL_REGISTER (decl
) = 1;
6350 /* Record constancy and volatility. */
6351 c_apply_type_quals_to_decl (type_quals
, decl
);
6353 /* Apply _Alignas specifiers. */
6356 DECL_ALIGN (decl
) = alignas_align
* BITS_PER_UNIT
;
6357 DECL_USER_ALIGN (decl
) = 1;
6360 /* If a type has volatile components, it should be stored in memory.
6361 Otherwise, the fact that those components are volatile
6362 will be ignored, and would even crash the compiler.
6363 Of course, this only makes sense on VAR,PARM, and RESULT decl's. */
6364 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl
))
6365 && (TREE_CODE (decl
) == VAR_DECL
|| TREE_CODE (decl
) == PARM_DECL
6366 || TREE_CODE (decl
) == RESULT_DECL
))
6368 /* It is not an error for a structure with volatile fields to
6369 be declared register, but reset DECL_REGISTER since it
6370 cannot actually go in a register. */
6371 int was_reg
= C_DECL_REGISTER (decl
);
6372 C_DECL_REGISTER (decl
) = 0;
6373 DECL_REGISTER (decl
) = 0;
6374 c_mark_addressable (decl
);
6375 C_DECL_REGISTER (decl
) = was_reg
;
6378 /* This is the earliest point at which we might know the assembler
6379 name of a variable. Thus, if it's known before this, die horribly. */
6380 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl
));
6383 && TREE_CODE (decl
) == VAR_DECL
6384 && TREE_PUBLIC (decl
)
6385 && TREE_STATIC (decl
)
6386 && (TREE_CODE (TREE_TYPE (decl
)) == RECORD_TYPE
6387 || TREE_CODE (TREE_TYPE (decl
)) == UNION_TYPE
6388 || TREE_CODE (TREE_TYPE (decl
)) == ENUMERAL_TYPE
)
6389 && TYPE_NAME (TREE_TYPE (decl
)) == NULL_TREE
)
6390 warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wc___compat
,
6391 ("non-local variable %qD with anonymous type is "
6392 "questionable in C++"),
6399 /* Decode the parameter-list info for a function type or function definition.
6400 The argument is the value returned by `get_parm_info' (or made in c-parse.c
6401 if there is an identifier list instead of a parameter decl list).
6402 These two functions are separate because when a function returns
6403 or receives functions then each is called multiple times but the order
6404 of calls is different. The last call to `grokparms' is always the one
6405 that contains the formal parameter names of a function definition.
6407 Return a list of arg types to use in the FUNCTION_TYPE for this function.
6409 FUNCDEF_FLAG is true for a function definition, false for
6410 a mere declaration. A nonempty identifier-list gets an error message
6411 when FUNCDEF_FLAG is false. */
6414 grokparms (struct c_arg_info
*arg_info
, bool funcdef_flag
)
6416 tree arg_types
= arg_info
->types
;
6418 if (funcdef_flag
&& arg_info
->had_vla_unspec
)
6420 /* A function definition isn't function prototype scope C99 6.2.1p4. */
6422 error ("%<[*]%> not allowed in other than function prototype scope");
6425 if (arg_types
== 0 && !funcdef_flag
6426 && !in_system_header_at (input_location
))
6427 warning (OPT_Wstrict_prototypes
,
6428 "function declaration isn%'t a prototype");
6430 if (arg_types
== error_mark_node
)
6431 return 0; /* don't set TYPE_ARG_TYPES in this case */
6433 else if (arg_types
&& TREE_CODE (TREE_VALUE (arg_types
)) == IDENTIFIER_NODE
)
6437 pedwarn (input_location
, 0, "parameter names (without types) in function declaration");
6438 arg_info
->parms
= NULL_TREE
;
6441 arg_info
->parms
= arg_info
->types
;
6443 arg_info
->types
= 0;
6448 tree parm
, type
, typelt
;
6449 unsigned int parmno
;
6452 /* If there is a parameter of incomplete type in a definition,
6453 this is an error. In a declaration this is valid, and a
6454 struct or union type may be completed later, before any calls
6455 or definition of the function. In the case where the tag was
6456 first declared within the parameter list, a warning has
6457 already been given. If a parameter has void type, then
6458 however the function cannot be defined or called, so
6461 for (parm
= arg_info
->parms
, typelt
= arg_types
, parmno
= 1;
6463 parm
= DECL_CHAIN (parm
), typelt
= TREE_CHAIN (typelt
), parmno
++)
6465 type
= TREE_VALUE (typelt
);
6466 if (type
== error_mark_node
)
6469 if (!COMPLETE_TYPE_P (type
))
6473 if (DECL_NAME (parm
))
6474 error_at (input_location
,
6475 "parameter %u (%q+D) has incomplete type",
6478 error_at (DECL_SOURCE_LOCATION (parm
),
6479 "parameter %u has incomplete type",
6482 TREE_VALUE (typelt
) = error_mark_node
;
6483 TREE_TYPE (parm
) = error_mark_node
;
6484 arg_types
= NULL_TREE
;
6486 else if (VOID_TYPE_P (type
))
6488 if (DECL_NAME (parm
))
6489 warning_at (input_location
, 0,
6490 "parameter %u (%q+D) has void type",
6493 warning_at (DECL_SOURCE_LOCATION (parm
), 0,
6494 "parameter %u has void type",
6499 errmsg
= targetm
.invalid_parameter_type (type
);
6503 TREE_VALUE (typelt
) = error_mark_node
;
6504 TREE_TYPE (parm
) = error_mark_node
;
6505 arg_types
= NULL_TREE
;
6508 if (DECL_NAME (parm
) && TREE_USED (parm
))
6509 warn_if_shadowing (parm
);
6515 /* Allocate and initialize a c_arg_info structure from the parser's
6519 build_arg_info (void)
6521 struct c_arg_info
*ret
= XOBNEW (&parser_obstack
, struct c_arg_info
);
6522 ret
->parms
= NULL_TREE
;
6524 ret
->types
= NULL_TREE
;
6525 ret
->others
= NULL_TREE
;
6526 ret
->pending_sizes
= NULL
;
6527 ret
->had_vla_unspec
= 0;
6531 /* Take apart the current scope and return a c_arg_info structure with
6532 info on a parameter list just parsed.
6534 This structure is later fed to 'grokparms' and 'store_parm_decls'.
6536 ELLIPSIS being true means the argument list ended in '...' so don't
6537 append a sentinel (void_list_node) to the end of the type-list.
6539 EXPR is NULL or an expression that needs to be evaluated for the
6540 side effects of array size expressions in the parameters. */
6543 get_parm_info (bool ellipsis
, tree expr
)
6545 struct c_binding
*b
= current_scope
->bindings
;
6546 struct c_arg_info
*arg_info
= build_arg_info ();
6549 vec
<c_arg_tag
, va_gc
> *tags
= NULL
;
6553 static bool explained_incomplete_types
= false;
6554 bool gave_void_only_once_err
= false;
6556 arg_info
->had_vla_unspec
= current_scope
->had_vla_unspec
;
6558 /* The bindings in this scope must not get put into a block.
6559 We will take care of deleting the binding nodes. */
6560 current_scope
->bindings
= 0;
6562 /* This function is only called if there was *something* on the
6566 /* A parameter list consisting solely of 'void' indicates that the
6567 function takes no arguments. But if the 'void' is qualified
6568 (by 'const' or 'volatile'), or has a storage class specifier
6569 ('register'), then the behavior is undefined; issue an error.
6570 Typedefs for 'void' are OK (see DR#157). */
6571 if (b
->prev
== 0 /* one binding */
6572 && TREE_CODE (b
->decl
) == PARM_DECL
/* which is a parameter */
6573 && !DECL_NAME (b
->decl
) /* anonymous */
6574 && VOID_TYPE_P (TREE_TYPE (b
->decl
))) /* of void type */
6576 if (TYPE_QUALS (TREE_TYPE (b
->decl
)) != TYPE_UNQUALIFIED
6577 || C_DECL_REGISTER (b
->decl
))
6578 error ("%<void%> as only parameter may not be qualified");
6580 /* There cannot be an ellipsis. */
6582 error ("%<void%> must be the only parameter");
6584 arg_info
->types
= void_list_node
;
6589 types
= void_list_node
;
6591 /* Break up the bindings list into parms, tags, types, and others;
6592 apply sanity checks; purge the name-to-decl bindings. */
6595 tree decl
= b
->decl
;
6596 tree type
= TREE_TYPE (decl
);
6598 const char *keyword
;
6600 switch (TREE_CODE (decl
))
6605 gcc_assert (I_SYMBOL_BINDING (b
->id
) == b
);
6606 I_SYMBOL_BINDING (b
->id
) = b
->shadowed
;
6609 /* Check for forward decls that never got their actual decl. */
6610 if (TREE_ASM_WRITTEN (decl
))
6611 error ("parameter %q+D has just a forward declaration", decl
);
6612 /* Check for (..., void, ...) and issue an error. */
6613 else if (VOID_TYPE_P (type
) && !DECL_NAME (decl
))
6615 if (!gave_void_only_once_err
)
6617 error ("%<void%> must be the only parameter");
6618 gave_void_only_once_err
= true;
6623 /* Valid parameter, add it to the list. */
6624 DECL_CHAIN (decl
) = parms
;
6627 /* Since there is a prototype, args are passed in their
6628 declared types. The back end may override this later. */
6629 DECL_ARG_TYPE (decl
) = type
;
6630 types
= tree_cons (0, type
, types
);
6634 case ENUMERAL_TYPE
: keyword
= "enum"; goto tag
;
6635 case UNION_TYPE
: keyword
= "union"; goto tag
;
6636 case RECORD_TYPE
: keyword
= "struct"; goto tag
;
6638 /* Types may not have tag-names, in which case the type
6639 appears in the bindings list with b->id NULL. */
6642 gcc_assert (I_TAG_BINDING (b
->id
) == b
);
6643 I_TAG_BINDING (b
->id
) = b
->shadowed
;
6646 /* Warn about any struct, union or enum tags defined in a
6647 parameter list. The scope of such types is limited to
6648 the parameter list, which is rarely if ever desirable
6649 (it's impossible to call such a function with type-
6650 correct arguments). An anonymous union parm type is
6651 meaningful as a GNU extension, so don't warn for that. */
6652 if (TREE_CODE (decl
) != UNION_TYPE
|| b
->id
!= 0)
6655 /* The %s will be one of 'struct', 'union', or 'enum'. */
6656 warning (0, "%<%s %E%> declared inside parameter list",
6659 /* The %s will be one of 'struct', 'union', or 'enum'. */
6660 warning (0, "anonymous %s declared inside parameter list",
6663 if (!explained_incomplete_types
)
6665 warning (0, "its scope is only this definition or declaration,"
6666 " which is probably not what you want");
6667 explained_incomplete_types
= true;
6673 vec_safe_push (tags
, tag
);
6679 /* CONST_DECLs appear here when we have an embedded enum,
6680 and TYPE_DECLs appear here when we have an embedded struct
6681 or union. No warnings for this - we already warned about the
6682 type itself. FUNCTION_DECLs appear when there is an implicit
6683 function declaration in the parameter list. */
6685 /* When we reinsert this decl in the function body, we need
6686 to reconstruct whether it was marked as nested. */
6687 gcc_assert (TREE_CODE (decl
) == FUNCTION_DECL
6690 DECL_CHAIN (decl
) = others
;
6695 /* error_mark_node appears here when we have an undeclared
6696 variable. Just throw it away. */
6699 gcc_assert (I_SYMBOL_BINDING (b
->id
) == b
);
6700 I_SYMBOL_BINDING (b
->id
) = b
->shadowed
;
6704 /* Other things that might be encountered. */
6711 b
= free_binding_and_advance (b
);
6714 arg_info
->parms
= parms
;
6715 arg_info
->tags
= tags
;
6716 arg_info
->types
= types
;
6717 arg_info
->others
= others
;
6718 arg_info
->pending_sizes
= expr
;
6722 /* Get the struct, enum or union (CODE says which) with tag NAME.
6723 Define the tag as a forward-reference with location LOC if it is
6724 not defined. Return a c_typespec structure for the type
6728 parser_xref_tag (location_t loc
, enum tree_code code
, tree name
)
6730 struct c_typespec ret
;
6734 ret
.expr
= NULL_TREE
;
6735 ret
.expr_const_operands
= true;
6737 /* If a cross reference is requested, look up the type
6738 already defined for this tag and return it. */
6740 ref
= lookup_tag (code
, name
, 0, &refloc
);
6741 /* If this is the right type of tag, return what we found.
6742 (This reference will be shadowed by shadow_tag later if appropriate.)
6743 If this is the wrong type of tag, do not return it. If it was the
6744 wrong type in the same scope, we will have had an error
6745 message already; if in a different scope and declaring
6746 a name, pending_xref_error will give an error message; but if in a
6747 different scope and not declaring a name, this tag should
6748 shadow the previous declaration of a different type of tag, and
6749 this would not work properly if we return the reference found.
6750 (For example, with "struct foo" in an outer scope, "union foo;"
6751 must shadow that tag with a new one of union type.) */
6752 ret
.kind
= (ref
? ctsk_tagref
: ctsk_tagfirstref
);
6753 if (ref
&& TREE_CODE (ref
) == code
)
6755 if (C_TYPE_DEFINED_IN_STRUCT (ref
)
6756 && loc
!= UNKNOWN_LOCATION
6762 warning_at (loc
, OPT_Wc___compat
,
6763 ("enum type defined in struct or union "
6764 "is not visible in C++"));
6765 inform (refloc
, "enum type defined here");
6768 warning_at (loc
, OPT_Wc___compat
,
6769 ("struct defined in struct or union "
6770 "is not visible in C++"));
6771 inform (refloc
, "struct defined here");
6774 warning_at (loc
, OPT_Wc___compat
,
6775 ("union defined in struct or union "
6776 "is not visible in C++"));
6777 inform (refloc
, "union defined here");
6788 /* If no such tag is yet defined, create a forward-reference node
6789 and record it as the "definition".
6790 When a real declaration of this type is found,
6791 the forward-reference will be altered into a real type. */
6793 ref
= make_node (code
);
6794 if (code
== ENUMERAL_TYPE
)
6796 /* Give the type a default layout like unsigned int
6797 to avoid crashing if it does not get defined. */
6798 SET_TYPE_MODE (ref
, TYPE_MODE (unsigned_type_node
));
6799 TYPE_ALIGN (ref
) = TYPE_ALIGN (unsigned_type_node
);
6800 TYPE_USER_ALIGN (ref
) = 0;
6801 TYPE_UNSIGNED (ref
) = 1;
6802 TYPE_PRECISION (ref
) = TYPE_PRECISION (unsigned_type_node
);
6803 TYPE_MIN_VALUE (ref
) = TYPE_MIN_VALUE (unsigned_type_node
);
6804 TYPE_MAX_VALUE (ref
) = TYPE_MAX_VALUE (unsigned_type_node
);
6807 pushtag (loc
, name
, ref
);
6813 /* Get the struct, enum or union (CODE says which) with tag NAME.
6814 Define the tag as a forward-reference if it is not defined.
6815 Return a tree for the type. */
6818 xref_tag (enum tree_code code
, tree name
)
6820 return parser_xref_tag (input_location
, code
, name
).spec
;
6823 /* Make sure that the tag NAME is defined *in the current scope*
6824 at least as a forward reference.
6825 LOC is the location of the struct's definition.
6826 CODE says which kind of tag NAME ought to be.
6828 This stores the current value of the file static STRUCT_PARSE_INFO
6829 in *ENCLOSING_STRUCT_PARSE_INFO, and points STRUCT_PARSE_INFO at a
6830 new c_struct_parse_info structure. The old value of
6831 STRUCT_PARSE_INFO is restored in finish_struct. */
6834 start_struct (location_t loc
, enum tree_code code
, tree name
,
6835 struct c_struct_parse_info
**enclosing_struct_parse_info
)
6837 /* If there is already a tag defined at this scope
6838 (as a forward reference), just return it. */
6840 tree ref
= NULL_TREE
;
6841 location_t refloc
= UNKNOWN_LOCATION
;
6843 if (name
!= NULL_TREE
)
6844 ref
= lookup_tag (code
, name
, 1, &refloc
);
6845 if (ref
&& TREE_CODE (ref
) == code
)
6847 if (TYPE_SIZE (ref
))
6849 if (code
== UNION_TYPE
)
6850 error_at (loc
, "redefinition of %<union %E%>", name
);
6852 error_at (loc
, "redefinition of %<struct %E%>", name
);
6853 if (refloc
!= UNKNOWN_LOCATION
)
6854 inform (refloc
, "originally defined here");
6855 /* Don't create structures using a name already in use. */
6858 else if (C_TYPE_BEING_DEFINED (ref
))
6860 if (code
== UNION_TYPE
)
6861 error_at (loc
, "nested redefinition of %<union %E%>", name
);
6863 error_at (loc
, "nested redefinition of %<struct %E%>", name
);
6864 /* Don't bother to report "originally defined here" for a
6865 nested redefinition; the original definition should be
6867 /* Don't create structures that contain themselves. */
6872 /* Otherwise create a forward-reference just so the tag is in scope. */
6874 if (ref
== NULL_TREE
|| TREE_CODE (ref
) != code
)
6876 ref
= make_node (code
);
6877 pushtag (loc
, name
, ref
);
6880 C_TYPE_BEING_DEFINED (ref
) = 1;
6881 TYPE_PACKED (ref
) = flag_pack_struct
;
6883 *enclosing_struct_parse_info
= struct_parse_info
;
6884 struct_parse_info
= XNEW (struct c_struct_parse_info
);
6885 struct_parse_info
->struct_types
.create (0);
6886 struct_parse_info
->fields
.create (0);
6887 struct_parse_info
->typedefs_seen
.create (0);
6889 /* FIXME: This will issue a warning for a use of a type defined
6890 within a statement expr used within sizeof, et. al. This is not
6891 terribly serious as C++ doesn't permit statement exprs within
6893 if (warn_cxx_compat
&& (in_sizeof
|| in_typeof
|| in_alignof
))
6894 warning_at (loc
, OPT_Wc___compat
,
6895 "defining type in %qs expression is invalid in C++",
6898 : (in_typeof
? "typeof" : "alignof")));
6903 /* Process the specs, declarator and width (NULL if omitted)
6904 of a structure component, returning a FIELD_DECL node.
6905 WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node.
6906 DECL_ATTRS is as for grokdeclarator.
6908 LOC is the location of the structure component.
6910 This is done during the parsing of the struct declaration.
6911 The FIELD_DECL nodes are chained together and the lot of them
6912 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
6915 grokfield (location_t loc
,
6916 struct c_declarator
*declarator
, struct c_declspecs
*declspecs
,
6917 tree width
, tree
*decl_attrs
)
6921 if (declarator
->kind
== cdk_id
&& declarator
->u
.id
== NULL_TREE
6922 && width
== NULL_TREE
)
6924 /* This is an unnamed decl.
6926 If we have something of the form "union { list } ;" then this
6927 is the anonymous union extension. Similarly for struct.
6929 If this is something of the form "struct foo;", then
6930 If MS or Plan 9 extensions are enabled, this is handled as
6931 an anonymous struct.
6932 Otherwise this is a forward declaration of a structure tag.
6934 If this is something of the form "foo;" and foo is a TYPE_DECL, then
6935 If foo names a structure or union without a tag, then this
6936 is an anonymous struct (this is permitted by C11).
6937 If MS or Plan 9 extensions are enabled and foo names a
6938 structure, then again this is an anonymous struct.
6939 Otherwise this is an error.
6941 Oh what a horrid tangled web we weave. I wonder if MS consciously
6942 took this from Plan 9 or if it was an accident of implementation
6943 that took root before someone noticed the bug... */
6945 tree type
= declspecs
->type
;
6946 bool type_ok
= (TREE_CODE (type
) == RECORD_TYPE
6947 || TREE_CODE (type
) == UNION_TYPE
);
6951 && (flag_ms_extensions
6952 || flag_plan9_extensions
6953 || !declspecs
->typedef_p
))
6955 if (flag_ms_extensions
|| flag_plan9_extensions
)
6957 else if (TYPE_NAME (type
) == NULL
)
6964 pedwarn (loc
, 0, "declaration does not declare anything");
6970 pedwarn (loc
, OPT_Wpedantic
,
6971 "ISO C99 doesn%'t support unnamed structs/unions");
6973 pedwarn (loc
, OPT_Wpedantic
,
6974 "ISO C90 doesn%'t support unnamed structs/unions");
6978 value
= grokdeclarator (declarator
, declspecs
, FIELD
, false,
6979 width
? &width
: NULL
, decl_attrs
, NULL
, NULL
,
6982 finish_decl (value
, loc
, NULL_TREE
, NULL_TREE
, NULL_TREE
);
6983 DECL_INITIAL (value
) = width
;
6985 if (warn_cxx_compat
&& DECL_NAME (value
) != NULL_TREE
)
6987 /* If we currently have a binding for this field, set the
6988 in_struct field in the binding, so that we warn about lookups
6990 struct c_binding
*b
= I_SYMBOL_BINDING (DECL_NAME (value
));
6993 /* If the in_struct field is not yet set, push it on a list
6994 to be cleared when this struct is finished. */
6997 struct_parse_info
->fields
.safe_push (b
);
7006 /* Subroutine of detect_field_duplicates: return whether X and Y,
7007 which are both fields in the same struct, have duplicate field
7011 is_duplicate_field (tree x
, tree y
)
7013 if (DECL_NAME (x
) != NULL_TREE
&& DECL_NAME (x
) == DECL_NAME (y
))
7016 /* When using -fplan9-extensions, an anonymous field whose name is a
7017 typedef can duplicate a field name. */
7018 if (flag_plan9_extensions
7019 && (DECL_NAME (x
) == NULL_TREE
|| DECL_NAME (y
) == NULL_TREE
))
7021 tree xt
, xn
, yt
, yn
;
7024 if (DECL_NAME (x
) != NULL_TREE
)
7026 else if ((TREE_CODE (xt
) == RECORD_TYPE
|| TREE_CODE (xt
) == UNION_TYPE
)
7027 && TYPE_NAME (xt
) != NULL_TREE
7028 && TREE_CODE (TYPE_NAME (xt
)) == TYPE_DECL
)
7029 xn
= DECL_NAME (TYPE_NAME (xt
));
7034 if (DECL_NAME (y
) != NULL_TREE
)
7036 else if ((TREE_CODE (yt
) == RECORD_TYPE
|| TREE_CODE (yt
) == UNION_TYPE
)
7037 && TYPE_NAME (yt
) != NULL_TREE
7038 && TREE_CODE (TYPE_NAME (yt
)) == TYPE_DECL
)
7039 yn
= DECL_NAME (TYPE_NAME (yt
));
7043 if (xn
!= NULL_TREE
&& xn
== yn
)
7050 /* Subroutine of detect_field_duplicates: add the fields of FIELDLIST
7051 to HTAB, giving errors for any duplicates. */
7054 detect_field_duplicates_hash (tree fieldlist
,
7055 hash_table
<pointer_hash
<tree_node
> > htab
)
7060 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
7061 if ((y
= DECL_NAME (x
)) != 0)
7063 slot
= htab
.find_slot (y
, INSERT
);
7066 error ("duplicate member %q+D", x
);
7067 DECL_NAME (x
) = NULL_TREE
;
7071 else if (TREE_CODE (TREE_TYPE (x
)) == RECORD_TYPE
7072 || TREE_CODE (TREE_TYPE (x
)) == UNION_TYPE
)
7074 detect_field_duplicates_hash (TYPE_FIELDS (TREE_TYPE (x
)), htab
);
7076 /* When using -fplan9-extensions, an anonymous field whose
7077 name is a typedef can duplicate a field name. */
7078 if (flag_plan9_extensions
7079 && TYPE_NAME (TREE_TYPE (x
)) != NULL_TREE
7080 && TREE_CODE (TYPE_NAME (TREE_TYPE (x
))) == TYPE_DECL
)
7082 tree xn
= DECL_NAME (TYPE_NAME (TREE_TYPE (x
)));
7083 slot
= htab
.find_slot (xn
, INSERT
);
7085 error ("duplicate member %q+D", TYPE_NAME (TREE_TYPE (x
)));
7091 /* Generate an error for any duplicate field names in FIELDLIST. Munge
7092 the list such that this does not present a problem later. */
7095 detect_field_duplicates (tree fieldlist
)
7100 /* If the struct is the list of instance variables of an Objective-C
7101 class, then we need to check all the instance variables of
7102 superclasses when checking for duplicates (since you can't have
7103 an instance variable in a subclass with the same name as an
7104 instance variable in a superclass). We pass on this job to the
7105 Objective-C compiler. objc_detect_field_duplicates() will return
7106 false if we are not checking the list of instance variables and
7107 the C frontend should proceed with the standard field duplicate
7108 checks. If we are checking the list of instance variables, the
7109 ObjC frontend will do the check, emit the errors if needed, and
7110 then return true. */
7111 if (c_dialect_objc ())
7112 if (objc_detect_field_duplicates (false))
7115 /* First, see if there are more than "a few" fields.
7116 This is trivially true if there are zero or one fields. */
7117 if (!fieldlist
|| !DECL_CHAIN (fieldlist
))
7122 if (DECL_NAME (x
) == NULL_TREE
7123 && (TREE_CODE (TREE_TYPE (x
)) == RECORD_TYPE
7124 || TREE_CODE (TREE_TYPE (x
)) == UNION_TYPE
))
7127 } while (timeout
> 0 && x
);
7129 /* If there were "few" fields and no anonymous structures or unions,
7130 avoid the overhead of allocating a hash table. Instead just do
7131 the nested traversal thing. */
7134 for (x
= DECL_CHAIN (fieldlist
); x
; x
= DECL_CHAIN (x
))
7135 /* When using -fplan9-extensions, we can have duplicates
7136 between typedef names and fields. */
7138 || (flag_plan9_extensions
7139 && DECL_NAME (x
) == NULL_TREE
7140 && (TREE_CODE (TREE_TYPE (x
)) == RECORD_TYPE
7141 || TREE_CODE (TREE_TYPE (x
)) == UNION_TYPE
)
7142 && TYPE_NAME (TREE_TYPE (x
)) != NULL_TREE
7143 && TREE_CODE (TYPE_NAME (TREE_TYPE (x
))) == TYPE_DECL
))
7145 for (y
= fieldlist
; y
!= x
; y
= TREE_CHAIN (y
))
7146 if (is_duplicate_field (y
, x
))
7148 error ("duplicate member %q+D", x
);
7149 DECL_NAME (x
) = NULL_TREE
;
7155 hash_table
<pointer_hash
<tree_node
> > htab
;
7158 detect_field_duplicates_hash (fieldlist
, htab
);
7163 /* Finish up struct info used by -Wc++-compat. */
7166 warn_cxx_compat_finish_struct (tree fieldlist
)
7170 struct c_binding
*b
;
7172 /* Set the C_TYPE_DEFINED_IN_STRUCT flag for each type defined in
7173 the current struct. We do this now at the end of the struct
7174 because the flag is used to issue visibility warnings, and we
7175 only want to issue those warnings if the type is referenced
7176 outside of the struct declaration. */
7177 FOR_EACH_VEC_ELT (struct_parse_info
->struct_types
, ix
, x
)
7178 C_TYPE_DEFINED_IN_STRUCT (x
) = 1;
7180 /* The TYPEDEFS_SEEN field of STRUCT_PARSE_INFO is a list of
7181 typedefs used when declaring fields in this struct. If the name
7182 of any of the fields is also a typedef name then the struct would
7183 not parse in C++, because the C++ lookup rules say that the
7184 typedef name would be looked up in the context of the struct, and
7185 would thus be the field rather than the typedef. */
7186 if (!struct_parse_info
->typedefs_seen
.is_empty ()
7187 && fieldlist
!= NULL_TREE
)
7189 /* Use a pointer_set using the name of the typedef. We can use
7190 a pointer_set because identifiers are interned. */
7191 struct pointer_set_t
*tset
= pointer_set_create ();
7193 FOR_EACH_VEC_ELT (struct_parse_info
->typedefs_seen
, ix
, x
)
7194 pointer_set_insert (tset
, DECL_NAME (x
));
7196 for (x
= fieldlist
; x
!= NULL_TREE
; x
= DECL_CHAIN (x
))
7198 if (DECL_NAME (x
) != NULL_TREE
7199 && pointer_set_contains (tset
, DECL_NAME (x
)))
7201 warning_at (DECL_SOURCE_LOCATION (x
), OPT_Wc___compat
,
7202 ("using %qD as both field and typedef name is "
7205 /* FIXME: It would be nice to report the location where
7206 the typedef name is used. */
7210 pointer_set_destroy (tset
);
7213 /* For each field which has a binding and which was not defined in
7214 an enclosing struct, clear the in_struct field. */
7215 FOR_EACH_VEC_ELT (struct_parse_info
->fields
, ix
, b
)
7219 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
7220 LOC is the location of the RECORD_TYPE or UNION_TYPE's definition.
7221 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
7222 ATTRIBUTES are attributes to be applied to the structure.
7224 ENCLOSING_STRUCT_PARSE_INFO is the value of STRUCT_PARSE_INFO when
7225 the struct was started. */
7228 finish_struct (location_t loc
, tree t
, tree fieldlist
, tree attributes
,
7229 struct c_struct_parse_info
*enclosing_struct_parse_info
)
7232 bool toplevel
= file_scope
== current_scope
;
7233 int saw_named_field
;
7235 /* If this type was previously laid out as a forward reference,
7236 make sure we lay it out again. */
7240 decl_attributes (&t
, attributes
, (int) ATTR_FLAG_TYPE_IN_PLACE
);
7244 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
7246 if (DECL_NAME (x
) != 0)
7249 && (TREE_CODE (TREE_TYPE (x
)) == RECORD_TYPE
7250 || TREE_CODE (TREE_TYPE (x
)) == UNION_TYPE
))
7256 if (TREE_CODE (t
) == UNION_TYPE
)
7259 pedwarn (loc
, OPT_Wpedantic
, "union has no named members");
7261 pedwarn (loc
, OPT_Wpedantic
, "union has no members");
7266 pedwarn (loc
, OPT_Wpedantic
, "struct has no named members");
7268 pedwarn (loc
, OPT_Wpedantic
, "struct has no members");
7273 /* Install struct as DECL_CONTEXT of each field decl.
7274 Also process specified field sizes, found in the DECL_INITIAL,
7275 storing 0 there after the type has been changed to precision equal
7276 to its width, rather than the precision of the specified standard
7277 type. (Correct layout requires the original type to have been preserved
7280 saw_named_field
= 0;
7281 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
7283 if (TREE_TYPE (x
) == error_mark_node
)
7286 DECL_CONTEXT (x
) = t
;
7288 /* If any field is const, the structure type is pseudo-const. */
7289 if (TREE_READONLY (x
))
7290 C_TYPE_FIELDS_READONLY (t
) = 1;
7293 /* A field that is pseudo-const makes the structure likewise. */
7294 tree t1
= strip_array_types (TREE_TYPE (x
));
7295 if ((TREE_CODE (t1
) == RECORD_TYPE
|| TREE_CODE (t1
) == UNION_TYPE
)
7296 && C_TYPE_FIELDS_READONLY (t1
))
7297 C_TYPE_FIELDS_READONLY (t
) = 1;
7300 /* Any field that is volatile means variables of this type must be
7301 treated in some ways as volatile. */
7302 if (TREE_THIS_VOLATILE (x
))
7303 C_TYPE_FIELDS_VOLATILE (t
) = 1;
7305 /* Any field of nominal variable size implies structure is too. */
7306 if (C_DECL_VARIABLE_SIZE (x
))
7307 C_TYPE_VARIABLE_SIZE (t
) = 1;
7309 if (DECL_INITIAL (x
))
7311 unsigned HOST_WIDE_INT width
= tree_to_uhwi (DECL_INITIAL (x
));
7312 DECL_SIZE (x
) = bitsize_int (width
);
7313 DECL_BIT_FIELD (x
) = 1;
7314 SET_DECL_C_BIT_FIELD (x
);
7318 && (DECL_BIT_FIELD (x
)
7319 || TYPE_ALIGN (TREE_TYPE (x
)) > BITS_PER_UNIT
))
7320 DECL_PACKED (x
) = 1;
7322 /* Detect flexible array member in an invalid context. */
7323 if (TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
7324 && TYPE_SIZE (TREE_TYPE (x
)) == NULL_TREE
7325 && TYPE_DOMAIN (TREE_TYPE (x
)) != NULL_TREE
7326 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x
))) == NULL_TREE
)
7328 if (TREE_CODE (t
) == UNION_TYPE
)
7330 error_at (DECL_SOURCE_LOCATION (x
),
7331 "flexible array member in union");
7332 TREE_TYPE (x
) = error_mark_node
;
7334 else if (DECL_CHAIN (x
) != NULL_TREE
)
7336 error_at (DECL_SOURCE_LOCATION (x
),
7337 "flexible array member not at end of struct");
7338 TREE_TYPE (x
) = error_mark_node
;
7340 else if (!saw_named_field
)
7342 error_at (DECL_SOURCE_LOCATION (x
),
7343 "flexible array member in otherwise empty struct");
7344 TREE_TYPE (x
) = error_mark_node
;
7348 if (pedantic
&& TREE_CODE (t
) == RECORD_TYPE
7349 && flexible_array_type_p (TREE_TYPE (x
)))
7350 pedwarn (DECL_SOURCE_LOCATION (x
), OPT_Wpedantic
,
7351 "invalid use of structure with flexible array member");
7354 || TREE_CODE (TREE_TYPE (x
)) == RECORD_TYPE
7355 || TREE_CODE (TREE_TYPE (x
)) == UNION_TYPE
)
7356 saw_named_field
= 1;
7359 detect_field_duplicates (fieldlist
);
7361 /* Now we have the nearly final fieldlist. Record it,
7362 then lay out the structure or union (including the fields). */
7364 TYPE_FIELDS (t
) = fieldlist
;
7368 if (TYPE_SIZE_UNIT (t
)
7369 && TREE_CODE (TYPE_SIZE_UNIT (t
)) == INTEGER_CST
7370 && !TREE_OVERFLOW (TYPE_SIZE_UNIT (t
))
7371 && !valid_constant_size_p (TYPE_SIZE_UNIT (t
)))
7372 error ("type %qT is too large", t
);
7374 /* Give bit-fields their proper types. */
7376 tree
*fieldlistp
= &fieldlist
;
7378 if (TREE_CODE (*fieldlistp
) == FIELD_DECL
&& DECL_INITIAL (*fieldlistp
)
7379 && TREE_TYPE (*fieldlistp
) != error_mark_node
)
7381 unsigned HOST_WIDE_INT width
7382 = tree_to_uhwi (DECL_INITIAL (*fieldlistp
));
7383 tree type
= TREE_TYPE (*fieldlistp
);
7384 if (width
!= TYPE_PRECISION (type
))
7386 TREE_TYPE (*fieldlistp
)
7387 = c_build_bitfield_integer_type (width
, TYPE_UNSIGNED (type
));
7388 DECL_MODE (*fieldlistp
) = TYPE_MODE (TREE_TYPE (*fieldlistp
));
7390 DECL_INITIAL (*fieldlistp
) = 0;
7393 fieldlistp
= &DECL_CHAIN (*fieldlistp
);
7396 /* Now we have the truly final field list.
7397 Store it in this type and in the variants. */
7399 TYPE_FIELDS (t
) = fieldlist
;
7401 /* If there are lots of fields, sort so we can look through them fast.
7402 We arbitrarily consider 16 or more elts to be "a lot". */
7407 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
7409 if (len
> 15 || DECL_NAME (x
) == NULL
)
7417 struct lang_type
*space
;
7418 struct sorted_fields_type
*space2
;
7420 len
+= list_length (x
);
7422 /* Use the same allocation policy here that make_node uses, to
7423 ensure that this lives as long as the rest of the struct decl.
7424 All decls in an inline function need to be saved. */
7426 space
= ggc_alloc_cleared_lang_type (sizeof (struct lang_type
));
7427 space2
= ggc_alloc_sorted_fields_type
7428 (sizeof (struct sorted_fields_type
) + len
* sizeof (tree
));
7432 field_array
= &space2
->elts
[0];
7433 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
7435 field_array
[len
++] = x
;
7437 /* If there is anonymous struct or union, break out of the loop. */
7438 if (DECL_NAME (x
) == NULL
)
7441 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
7444 TYPE_LANG_SPECIFIC (t
) = space
;
7445 TYPE_LANG_SPECIFIC (t
)->s
->len
= len
;
7446 field_array
= TYPE_LANG_SPECIFIC (t
)->s
->elts
;
7447 qsort (field_array
, len
, sizeof (tree
), field_decl_cmp
);
7452 for (x
= TYPE_MAIN_VARIANT (t
); x
; x
= TYPE_NEXT_VARIANT (x
))
7454 TYPE_FIELDS (x
) = TYPE_FIELDS (t
);
7455 TYPE_LANG_SPECIFIC (x
) = TYPE_LANG_SPECIFIC (t
);
7456 C_TYPE_FIELDS_READONLY (x
) = C_TYPE_FIELDS_READONLY (t
);
7457 C_TYPE_FIELDS_VOLATILE (x
) = C_TYPE_FIELDS_VOLATILE (t
);
7458 C_TYPE_VARIABLE_SIZE (x
) = C_TYPE_VARIABLE_SIZE (t
);
7461 /* If this was supposed to be a transparent union, but we can't
7462 make it one, warn and turn off the flag. */
7463 if (TREE_CODE (t
) == UNION_TYPE
7464 && TYPE_TRANSPARENT_AGGR (t
)
7465 && (!TYPE_FIELDS (t
) || TYPE_MODE (t
) != DECL_MODE (TYPE_FIELDS (t
))))
7467 TYPE_TRANSPARENT_AGGR (t
) = 0;
7468 warning_at (loc
, 0, "union cannot be made transparent");
7471 /* If this structure or union completes the type of any previous
7472 variable declaration, lay it out and output its rtl. */
7473 for (x
= C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t
));
7477 tree decl
= TREE_VALUE (x
);
7478 if (TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
)
7479 layout_array_type (TREE_TYPE (decl
));
7480 if (TREE_CODE (decl
) != TYPE_DECL
)
7482 layout_decl (decl
, 0);
7483 if (c_dialect_objc ())
7484 objc_check_decl (decl
);
7485 rest_of_decl_compilation (decl
, toplevel
, 0);
7488 C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t
)) = 0;
7490 /* Update type location to the one of the definition, instead of e.g.
7491 a forward declaration. */
7492 if (TYPE_STUB_DECL (t
))
7493 DECL_SOURCE_LOCATION (TYPE_STUB_DECL (t
)) = loc
;
7495 /* Finish debugging output for this type. */
7496 rest_of_type_compilation (t
, toplevel
);
7498 /* If we're inside a function proper, i.e. not file-scope and not still
7499 parsing parameters, then arrange for the size of a variable sized type
7501 if (building_stmt_list_p () && variably_modified_type_p (t
, NULL_TREE
))
7502 add_stmt (build_stmt (loc
,
7503 DECL_EXPR
, build_decl (loc
, TYPE_DECL
, NULL
, t
)));
7505 if (warn_cxx_compat
)
7506 warn_cxx_compat_finish_struct (fieldlist
);
7508 struct_parse_info
->struct_types
.release ();
7509 struct_parse_info
->fields
.release ();
7510 struct_parse_info
->typedefs_seen
.release ();
7511 XDELETE (struct_parse_info
);
7513 struct_parse_info
= enclosing_struct_parse_info
;
7515 /* If this struct is defined inside a struct, add it to
7518 && struct_parse_info
!= NULL
7519 && !in_sizeof
&& !in_typeof
&& !in_alignof
)
7520 struct_parse_info
->struct_types
.safe_push (t
);
7525 /* Lay out the type T, and its element type, and so on. */
7528 layout_array_type (tree t
)
7530 if (TREE_CODE (TREE_TYPE (t
)) == ARRAY_TYPE
)
7531 layout_array_type (TREE_TYPE (t
));
7535 /* Begin compiling the definition of an enumeration type.
7536 NAME is its name (or null if anonymous).
7537 LOC is the enum's location.
7538 Returns the type object, as yet incomplete.
7539 Also records info about it so that build_enumerator
7540 may be used to declare the individual values as they are read. */
7543 start_enum (location_t loc
, struct c_enum_contents
*the_enum
, tree name
)
7545 tree enumtype
= NULL_TREE
;
7546 location_t enumloc
= UNKNOWN_LOCATION
;
7548 /* If this is the real definition for a previous forward reference,
7549 fill in the contents in the same object that used to be the
7550 forward reference. */
7552 if (name
!= NULL_TREE
)
7553 enumtype
= lookup_tag (ENUMERAL_TYPE
, name
, 1, &enumloc
);
7555 if (enumtype
== 0 || TREE_CODE (enumtype
) != ENUMERAL_TYPE
)
7557 enumtype
= make_node (ENUMERAL_TYPE
);
7558 pushtag (loc
, name
, enumtype
);
7561 if (C_TYPE_BEING_DEFINED (enumtype
))
7562 error_at (loc
, "nested redefinition of %<enum %E%>", name
);
7564 C_TYPE_BEING_DEFINED (enumtype
) = 1;
7566 if (TYPE_VALUES (enumtype
) != 0)
7568 /* This enum is a named one that has been declared already. */
7569 error_at (loc
, "redeclaration of %<enum %E%>", name
);
7570 if (enumloc
!= UNKNOWN_LOCATION
)
7571 inform (enumloc
, "originally defined here");
7573 /* Completely replace its old definition.
7574 The old enumerators remain defined, however. */
7575 TYPE_VALUES (enumtype
) = 0;
7578 the_enum
->enum_next_value
= integer_zero_node
;
7579 the_enum
->enum_overflow
= 0;
7581 if (flag_short_enums
)
7582 TYPE_PACKED (enumtype
) = 1;
7584 /* FIXME: This will issue a warning for a use of a type defined
7585 within sizeof in a statement expr. This is not terribly serious
7586 as C++ doesn't permit statement exprs within sizeof anyhow. */
7587 if (warn_cxx_compat
&& (in_sizeof
|| in_typeof
|| in_alignof
))
7588 warning_at (loc
, OPT_Wc___compat
,
7589 "defining type in %qs expression is invalid in C++",
7592 : (in_typeof
? "typeof" : "alignof")));
7597 /* After processing and defining all the values of an enumeration type,
7598 install their decls in the enumeration type and finish it off.
7599 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
7600 and ATTRIBUTES are the specified attributes.
7601 Returns ENUMTYPE. */
7604 finish_enum (tree enumtype
, tree values
, tree attributes
)
7607 tree minnode
= 0, maxnode
= 0;
7610 bool toplevel
= (file_scope
== current_scope
);
7611 struct lang_type
*lt
;
7613 decl_attributes (&enumtype
, attributes
, (int) ATTR_FLAG_TYPE_IN_PLACE
);
7615 /* Calculate the maximum value of any enumerator in this type. */
7617 if (values
== error_mark_node
)
7618 minnode
= maxnode
= integer_zero_node
;
7621 minnode
= maxnode
= TREE_VALUE (values
);
7622 for (pair
= TREE_CHAIN (values
); pair
; pair
= TREE_CHAIN (pair
))
7624 tree value
= TREE_VALUE (pair
);
7625 if (tree_int_cst_lt (maxnode
, value
))
7627 if (tree_int_cst_lt (value
, minnode
))
7632 /* Construct the final type of this enumeration. It is the same
7633 as one of the integral types - the narrowest one that fits, except
7634 that normally we only go as narrow as int - and signed iff any of
7635 the values are negative. */
7636 sign
= (tree_int_cst_sgn (minnode
) >= 0) ? UNSIGNED
: SIGNED
;
7637 precision
= MAX (tree_int_cst_min_precision (minnode
, sign
),
7638 tree_int_cst_min_precision (maxnode
, sign
));
7640 if (TYPE_PACKED (enumtype
) || precision
> TYPE_PRECISION (integer_type_node
))
7642 tem
= c_common_type_for_size (precision
, sign
== UNSIGNED
? 1 : 0);
7645 warning (0, "enumeration values exceed range of largest integer");
7646 tem
= long_long_integer_type_node
;
7650 tem
= sign
== UNSIGNED
? unsigned_type_node
: integer_type_node
;
7652 TYPE_MIN_VALUE (enumtype
) = TYPE_MIN_VALUE (tem
);
7653 TYPE_MAX_VALUE (enumtype
) = TYPE_MAX_VALUE (tem
);
7654 TYPE_UNSIGNED (enumtype
) = TYPE_UNSIGNED (tem
);
7655 TYPE_SIZE (enumtype
) = 0;
7657 /* If the precision of the type was specific with an attribute and it
7658 was too small, give an error. Otherwise, use it. */
7659 if (TYPE_PRECISION (enumtype
))
7661 if (precision
> TYPE_PRECISION (enumtype
))
7662 error ("specified mode too small for enumeral values");
7665 TYPE_PRECISION (enumtype
) = TYPE_PRECISION (tem
);
7667 layout_type (enumtype
);
7669 if (values
!= error_mark_node
)
7671 /* Change the type of the enumerators to be the enum type. We
7672 need to do this irrespective of the size of the enum, for
7673 proper type checking. Replace the DECL_INITIALs of the
7674 enumerators, and the value slots of the list, with copies
7675 that have the enum type; they cannot be modified in place
7676 because they may be shared (e.g. integer_zero_node) Finally,
7677 change the purpose slots to point to the names of the decls. */
7678 for (pair
= values
; pair
; pair
= TREE_CHAIN (pair
))
7680 tree enu
= TREE_PURPOSE (pair
);
7681 tree ini
= DECL_INITIAL (enu
);
7683 TREE_TYPE (enu
) = enumtype
;
7685 /* The ISO C Standard mandates enumerators to have type int,
7686 even though the underlying type of an enum type is
7687 unspecified. However, GCC allows enumerators of any
7688 integer type as an extensions. build_enumerator()
7689 converts any enumerators that fit in an int to type int,
7690 to avoid promotions to unsigned types when comparing
7691 integers with enumerators that fit in the int range.
7692 When -pedantic is given, build_enumerator() would have
7693 already warned about those that don't fit. Here we
7694 convert the rest to the enumerator type. */
7695 if (TREE_TYPE (ini
) != integer_type_node
)
7696 ini
= convert (enumtype
, ini
);
7698 DECL_INITIAL (enu
) = ini
;
7699 TREE_PURPOSE (pair
) = DECL_NAME (enu
);
7700 TREE_VALUE (pair
) = ini
;
7703 TYPE_VALUES (enumtype
) = values
;
7706 /* Record the min/max values so that we can warn about bit-field
7707 enumerations that are too small for the values. */
7708 lt
= ggc_alloc_cleared_lang_type (sizeof (struct lang_type
));
7709 lt
->enum_min
= minnode
;
7710 lt
->enum_max
= maxnode
;
7711 TYPE_LANG_SPECIFIC (enumtype
) = lt
;
7713 /* Fix up all variant types of this enum type. */
7714 for (tem
= TYPE_MAIN_VARIANT (enumtype
); tem
; tem
= TYPE_NEXT_VARIANT (tem
))
7716 if (tem
== enumtype
)
7718 TYPE_VALUES (tem
) = TYPE_VALUES (enumtype
);
7719 TYPE_MIN_VALUE (tem
) = TYPE_MIN_VALUE (enumtype
);
7720 TYPE_MAX_VALUE (tem
) = TYPE_MAX_VALUE (enumtype
);
7721 TYPE_SIZE (tem
) = TYPE_SIZE (enumtype
);
7722 TYPE_SIZE_UNIT (tem
) = TYPE_SIZE_UNIT (enumtype
);
7723 SET_TYPE_MODE (tem
, TYPE_MODE (enumtype
));
7724 TYPE_PRECISION (tem
) = TYPE_PRECISION (enumtype
);
7725 TYPE_ALIGN (tem
) = TYPE_ALIGN (enumtype
);
7726 TYPE_USER_ALIGN (tem
) = TYPE_USER_ALIGN (enumtype
);
7727 TYPE_UNSIGNED (tem
) = TYPE_UNSIGNED (enumtype
);
7728 TYPE_LANG_SPECIFIC (tem
) = TYPE_LANG_SPECIFIC (enumtype
);
7731 /* Finish debugging output for this type. */
7732 rest_of_type_compilation (enumtype
, toplevel
);
7734 /* If this enum is defined inside a struct, add it to
7737 && struct_parse_info
!= NULL
7738 && !in_sizeof
&& !in_typeof
&& !in_alignof
)
7739 struct_parse_info
->struct_types
.safe_push (enumtype
);
7744 /* Build and install a CONST_DECL for one value of the
7745 current enumeration type (one that was begun with start_enum).
7746 DECL_LOC is the location of the enumerator.
7747 LOC is the location of the '=' operator if any, DECL_LOC otherwise.
7748 Return a tree-list containing the CONST_DECL and its value.
7749 Assignment of sequential values by default is handled here. */
7752 build_enumerator (location_t decl_loc
, location_t loc
,
7753 struct c_enum_contents
*the_enum
, tree name
, tree value
)
7757 /* Validate and default VALUE. */
7761 /* Don't issue more errors for error_mark_node (i.e. an
7762 undeclared identifier) - just ignore the value expression. */
7763 if (value
== error_mark_node
)
7765 else if (!INTEGRAL_TYPE_P (TREE_TYPE (value
)))
7767 error_at (loc
, "enumerator value for %qE is not an integer constant",
7773 if (TREE_CODE (value
) != INTEGER_CST
)
7775 value
= c_fully_fold (value
, false, NULL
);
7776 if (TREE_CODE (value
) == INTEGER_CST
)
7777 pedwarn (loc
, OPT_Wpedantic
,
7778 "enumerator value for %qE is not an integer "
7779 "constant expression", name
);
7781 if (TREE_CODE (value
) != INTEGER_CST
)
7783 error ("enumerator value for %qE is not an integer constant",
7789 value
= default_conversion (value
);
7790 constant_expression_warning (value
);
7795 /* Default based on previous value. */
7796 /* It should no longer be possible to have NON_LVALUE_EXPR
7800 value
= the_enum
->enum_next_value
;
7801 if (the_enum
->enum_overflow
)
7802 error_at (loc
, "overflow in enumeration values");
7804 /* Even though the underlying type of an enum is unspecified, the
7805 type of enumeration constants is explicitly defined as int
7806 (6.4.4.3/2 in the C99 Standard). GCC allows any integer type as
7808 else if (!int_fits_type_p (value
, integer_type_node
))
7809 pedwarn (loc
, OPT_Wpedantic
,
7810 "ISO C restricts enumerator values to range of %<int%>");
7812 /* The ISO C Standard mandates enumerators to have type int, even
7813 though the underlying type of an enum type is unspecified.
7814 However, GCC allows enumerators of any integer type as an
7815 extensions. Here we convert any enumerators that fit in an int
7816 to type int, to avoid promotions to unsigned types when comparing
7817 integers with enumerators that fit in the int range. When
7818 -pedantic is given, we would have already warned about those that
7819 don't fit. We have to do this here rather than in finish_enum
7820 because this value may be used to define more enumerators. */
7821 if (int_fits_type_p (value
, integer_type_node
))
7822 value
= convert (integer_type_node
, value
);
7824 /* Set basis for default for next value. */
7825 the_enum
->enum_next_value
7826 = build_binary_op (EXPR_LOC_OR_LOC (value
, input_location
),
7827 PLUS_EXPR
, value
, integer_one_node
, 0);
7828 the_enum
->enum_overflow
= tree_int_cst_lt (the_enum
->enum_next_value
, value
);
7830 /* Now create a declaration for the enum value name. */
7832 type
= TREE_TYPE (value
);
7833 type
= c_common_type_for_size (MAX (TYPE_PRECISION (type
),
7834 TYPE_PRECISION (integer_type_node
)),
7835 (TYPE_PRECISION (type
)
7836 >= TYPE_PRECISION (integer_type_node
)
7837 && TYPE_UNSIGNED (type
)));
7839 decl
= build_decl (decl_loc
, CONST_DECL
, name
, type
);
7840 DECL_INITIAL (decl
) = convert (type
, value
);
7843 return tree_cons (decl
, value
, NULL_TREE
);
7847 /* Create the FUNCTION_DECL for a function definition.
7848 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
7849 the declaration; they describe the function's name and the type it returns,
7850 but twisted together in a fashion that parallels the syntax of C.
7852 This function creates a binding context for the function body
7853 as well as setting up the FUNCTION_DECL in current_function_decl.
7855 Returns 1 on success. If the DECLARATOR is not suitable for a function
7856 (it defines a datum instead), we return 0, which tells
7857 yyparse to report a parse error. */
7860 start_function (struct c_declspecs
*declspecs
, struct c_declarator
*declarator
,
7863 tree decl1
, old_decl
;
7864 tree restype
, resdecl
;
7867 current_function_returns_value
= 0; /* Assume, until we see it does. */
7868 current_function_returns_null
= 0;
7869 current_function_returns_abnormally
= 0;
7870 warn_about_return_type
= 0;
7871 c_switch_stack
= NULL
;
7873 /* Indicate no valid break/continue context by setting these variables
7874 to some non-null, non-label value. We'll notice and emit the proper
7875 error message in c_finish_bc_stmt. */
7876 c_break_label
= c_cont_label
= size_zero_node
;
7878 decl1
= grokdeclarator (declarator
, declspecs
, FUNCDEF
, true, NULL
,
7879 &attributes
, NULL
, NULL
, DEPRECATED_NORMAL
);
7881 /* If the declarator is not suitable for a function definition,
7882 cause a syntax error. */
7884 || TREE_CODE (decl1
) != FUNCTION_DECL
)
7887 loc
= DECL_SOURCE_LOCATION (decl1
);
7889 c_decl_attributes (&decl1
, attributes
, 0);
7891 if (DECL_DECLARED_INLINE_P (decl1
)
7892 && DECL_UNINLINABLE (decl1
)
7893 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1
)))
7894 warning_at (loc
, OPT_Wattributes
,
7895 "inline function %qD given attribute noinline",
7898 /* Handle gnu_inline attribute. */
7899 if (declspecs
->inline_p
7900 && !flag_gnu89_inline
7901 && TREE_CODE (decl1
) == FUNCTION_DECL
7902 && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl1
))
7903 || current_function_decl
))
7905 if (declspecs
->storage_class
!= csc_static
)
7906 DECL_EXTERNAL (decl1
) = !DECL_EXTERNAL (decl1
);
7909 announce_function (decl1
);
7911 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1
))))
7913 error_at (loc
, "return type is an incomplete type");
7914 /* Make it return void instead. */
7916 = build_function_type (void_type_node
,
7917 TYPE_ARG_TYPES (TREE_TYPE (decl1
)));
7920 if (warn_about_return_type
)
7921 pedwarn_c99 (loc
, flag_isoc99
? 0
7922 : (warn_return_type
? OPT_Wreturn_type
: OPT_Wimplicit_int
),
7923 "return type defaults to %<int%>");
7925 /* Make the init_value nonzero so pushdecl knows this is not tentative.
7926 error_mark_node is replaced below (in pop_scope) with the BLOCK. */
7927 DECL_INITIAL (decl1
) = error_mark_node
;
7929 /* A nested function is not global. */
7930 if (current_function_decl
!= 0)
7931 TREE_PUBLIC (decl1
) = 0;
7933 /* If this definition isn't a prototype and we had a prototype declaration
7934 before, copy the arg type info from that prototype. */
7935 old_decl
= lookup_name_in_scope (DECL_NAME (decl1
), current_scope
);
7936 if (old_decl
&& TREE_CODE (old_decl
) != FUNCTION_DECL
)
7938 current_function_prototype_locus
= UNKNOWN_LOCATION
;
7939 current_function_prototype_built_in
= false;
7940 current_function_prototype_arg_types
= NULL_TREE
;
7941 if (!prototype_p (TREE_TYPE (decl1
)))
7943 if (old_decl
!= 0 && TREE_CODE (TREE_TYPE (old_decl
)) == FUNCTION_TYPE
7944 && comptypes (TREE_TYPE (TREE_TYPE (decl1
)),
7945 TREE_TYPE (TREE_TYPE (old_decl
))))
7947 TREE_TYPE (decl1
) = composite_type (TREE_TYPE (old_decl
),
7949 current_function_prototype_locus
= DECL_SOURCE_LOCATION (old_decl
);
7950 current_function_prototype_built_in
7951 = C_DECL_BUILTIN_PROTOTYPE (old_decl
);
7952 current_function_prototype_arg_types
7953 = TYPE_ARG_TYPES (TREE_TYPE (decl1
));
7955 if (TREE_PUBLIC (decl1
))
7957 /* If there is an external prototype declaration of this
7958 function, record its location but do not copy information
7959 to this decl. This may be an invisible declaration
7960 (built-in or in a scope which has finished) or simply
7961 have more refined argument types than any declaration
7963 struct c_binding
*b
;
7964 for (b
= I_SYMBOL_BINDING (DECL_NAME (decl1
)); b
; b
= b
->shadowed
)
7965 if (B_IN_SCOPE (b
, external_scope
))
7969 tree ext_decl
, ext_type
;
7971 ext_type
= b
->u
.type
? b
->u
.type
: TREE_TYPE (ext_decl
);
7972 if (TREE_CODE (ext_type
) == FUNCTION_TYPE
7973 && comptypes (TREE_TYPE (TREE_TYPE (decl1
)),
7974 TREE_TYPE (ext_type
)))
7976 current_function_prototype_locus
7977 = DECL_SOURCE_LOCATION (ext_decl
);
7978 current_function_prototype_built_in
7979 = C_DECL_BUILTIN_PROTOTYPE (ext_decl
);
7980 current_function_prototype_arg_types
7981 = TYPE_ARG_TYPES (ext_type
);
7987 /* Optionally warn of old-fashioned def with no previous prototype. */
7988 if (warn_strict_prototypes
7989 && old_decl
!= error_mark_node
7990 && !prototype_p (TREE_TYPE (decl1
))
7991 && C_DECL_ISNT_PROTOTYPE (old_decl
))
7992 warning_at (loc
, OPT_Wstrict_prototypes
,
7993 "function declaration isn%'t a prototype");
7994 /* Optionally warn of any global def with no previous prototype. */
7995 else if (warn_missing_prototypes
7996 && old_decl
!= error_mark_node
7997 && TREE_PUBLIC (decl1
)
7998 && !MAIN_NAME_P (DECL_NAME (decl1
))
7999 && C_DECL_ISNT_PROTOTYPE (old_decl
)
8000 && !DECL_DECLARED_INLINE_P (decl1
))
8001 warning_at (loc
, OPT_Wmissing_prototypes
,
8002 "no previous prototype for %qD", decl1
);
8003 /* Optionally warn of any def with no previous prototype
8004 if the function has already been used. */
8005 else if (warn_missing_prototypes
8007 && old_decl
!= error_mark_node
8008 && TREE_USED (old_decl
)
8009 && !prototype_p (TREE_TYPE (old_decl
)))
8010 warning_at (loc
, OPT_Wmissing_prototypes
,
8011 "%qD was used with no prototype before its definition", decl1
);
8012 /* Optionally warn of any global def with no previous declaration. */
8013 else if (warn_missing_declarations
8014 && TREE_PUBLIC (decl1
)
8016 && !MAIN_NAME_P (DECL_NAME (decl1
)))
8017 warning_at (loc
, OPT_Wmissing_declarations
,
8018 "no previous declaration for %qD",
8020 /* Optionally warn of any def with no previous declaration
8021 if the function has already been used. */
8022 else if (warn_missing_declarations
8024 && old_decl
!= error_mark_node
8025 && TREE_USED (old_decl
)
8026 && C_DECL_IMPLICIT (old_decl
))
8027 warning_at (loc
, OPT_Wmissing_declarations
,
8028 "%qD was used with no declaration before its definition", decl1
);
8030 /* This function exists in static storage.
8031 (This does not mean `static' in the C sense!) */
8032 TREE_STATIC (decl1
) = 1;
8034 /* This is the earliest point at which we might know the assembler
8035 name of the function. Thus, if it's set before this, die horribly. */
8036 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl1
));
8038 /* If #pragma weak was used, mark the decl weak now. */
8039 if (current_scope
== file_scope
)
8040 maybe_apply_pragma_weak (decl1
);
8042 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
8043 if (warn_main
&& MAIN_NAME_P (DECL_NAME (decl1
)))
8045 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1
)))
8046 != integer_type_node
)
8047 pedwarn (loc
, OPT_Wmain
, "return type of %qD is not %<int%>", decl1
);
8048 else if (TYPE_ATOMIC (TREE_TYPE (TREE_TYPE (decl1
))))
8049 pedwarn (loc
, OPT_Wmain
, "%<_Atomic%>-qualified return type of %qD",
8052 check_main_parameter_types (decl1
);
8054 if (!TREE_PUBLIC (decl1
))
8055 pedwarn (loc
, OPT_Wmain
,
8056 "%qD is normally a non-static function", decl1
);
8059 /* Record the decl so that the function name is defined.
8060 If we already have a decl for this name, and it is a FUNCTION_DECL,
8061 use the old decl. */
8063 current_function_decl
= pushdecl (decl1
);
8066 declare_parm_level ();
8068 restype
= TREE_TYPE (TREE_TYPE (current_function_decl
));
8069 resdecl
= build_decl (loc
, RESULT_DECL
, NULL_TREE
, restype
);
8070 DECL_ARTIFICIAL (resdecl
) = 1;
8071 DECL_IGNORED_P (resdecl
) = 1;
8072 DECL_RESULT (current_function_decl
) = resdecl
;
8074 start_fname_decls ();
8079 /* Subroutine of store_parm_decls which handles new-style function
8080 definitions (prototype format). The parms already have decls, so we
8081 need only record them as in effect and complain if any redundant
8082 old-style parm decls were written. */
8084 store_parm_decls_newstyle (tree fndecl
, const struct c_arg_info
*arg_info
)
8090 if (current_scope
->bindings
)
8092 error_at (DECL_SOURCE_LOCATION (fndecl
),
8093 "old-style parameter declarations in prototyped "
8094 "function definition");
8096 /* Get rid of the old-style declarations. */
8100 /* Don't issue this warning for nested functions, and don't issue this
8101 warning if we got here because ARG_INFO_TYPES was error_mark_node
8102 (this happens when a function definition has just an ellipsis in
8103 its parameter list). */
8104 else if (!in_system_header_at (input_location
)
8105 && !current_function_scope
8106 && arg_info
->types
!= error_mark_node
)
8107 warning_at (DECL_SOURCE_LOCATION (fndecl
), OPT_Wtraditional
,
8108 "traditional C rejects ISO C style function definitions");
8110 /* Now make all the parameter declarations visible in the function body.
8111 We can bypass most of the grunt work of pushdecl. */
8112 for (decl
= arg_info
->parms
; decl
; decl
= DECL_CHAIN (decl
))
8114 DECL_CONTEXT (decl
) = current_function_decl
;
8115 if (DECL_NAME (decl
))
8117 bind (DECL_NAME (decl
), decl
, current_scope
,
8118 /*invisible=*/false, /*nested=*/false,
8120 if (!TREE_USED (decl
))
8121 warn_if_shadowing (decl
);
8124 error_at (DECL_SOURCE_LOCATION (decl
), "parameter name omitted");
8127 /* Record the parameter list in the function declaration. */
8128 DECL_ARGUMENTS (fndecl
) = arg_info
->parms
;
8130 /* Now make all the ancillary declarations visible, likewise. */
8131 for (decl
= arg_info
->others
; decl
; decl
= DECL_CHAIN (decl
))
8133 DECL_CONTEXT (decl
) = current_function_decl
;
8134 if (DECL_NAME (decl
))
8135 bind (DECL_NAME (decl
), decl
, current_scope
,
8136 /*invisible=*/false,
8137 /*nested=*/(TREE_CODE (decl
) == FUNCTION_DECL
),
8141 /* And all the tag declarations. */
8142 FOR_EACH_VEC_SAFE_ELT_REVERSE (arg_info
->tags
, ix
, tag
)
8144 bind (tag
->id
, tag
->type
, current_scope
,
8145 /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION
);
8148 /* Subroutine of store_parm_decls which handles old-style function
8149 definitions (separate parameter list and declarations). */
8152 store_parm_decls_oldstyle (tree fndecl
, const struct c_arg_info
*arg_info
)
8154 struct c_binding
*b
;
8155 tree parm
, decl
, last
;
8156 tree parmids
= arg_info
->parms
;
8157 struct pointer_set_t
*seen_args
= pointer_set_create ();
8159 if (!in_system_header_at (input_location
))
8160 warning_at (DECL_SOURCE_LOCATION (fndecl
),
8161 OPT_Wold_style_definition
, "old-style function definition");
8163 /* Match each formal parameter name with its declaration. Save each
8164 decl in the appropriate TREE_PURPOSE slot of the parmids chain. */
8165 for (parm
= parmids
; parm
; parm
= TREE_CHAIN (parm
))
8167 if (TREE_VALUE (parm
) == 0)
8169 error_at (DECL_SOURCE_LOCATION (fndecl
),
8170 "parameter name missing from parameter list");
8171 TREE_PURPOSE (parm
) = 0;
8175 b
= I_SYMBOL_BINDING (TREE_VALUE (parm
));
8176 if (b
&& B_IN_CURRENT_SCOPE (b
))
8179 /* Skip erroneous parameters. */
8180 if (decl
== error_mark_node
)
8182 /* If we got something other than a PARM_DECL it is an error. */
8183 if (TREE_CODE (decl
) != PARM_DECL
)
8184 error_at (DECL_SOURCE_LOCATION (decl
),
8185 "%qD declared as a non-parameter", decl
);
8186 /* If the declaration is already marked, we have a duplicate
8187 name. Complain and ignore the duplicate. */
8188 else if (pointer_set_contains (seen_args
, decl
))
8190 error_at (DECL_SOURCE_LOCATION (decl
),
8191 "multiple parameters named %qD", decl
);
8192 TREE_PURPOSE (parm
) = 0;
8195 /* If the declaration says "void", complain and turn it into
8197 else if (VOID_TYPE_P (TREE_TYPE (decl
)))
8199 error_at (DECL_SOURCE_LOCATION (decl
),
8200 "parameter %qD declared with void type", decl
);
8201 TREE_TYPE (decl
) = integer_type_node
;
8202 DECL_ARG_TYPE (decl
) = integer_type_node
;
8203 layout_decl (decl
, 0);
8205 warn_if_shadowing (decl
);
8207 /* If no declaration found, default to int. */
8210 /* FIXME diagnostics: This should be the location of the argument,
8211 not the FNDECL. E.g., for an old-style declaration
8213 int f10(v) { blah; }
8215 We should use the location of the V, not the F10.
8216 Unfortunately, the V is an IDENTIFIER_NODE which has no
8217 location. In the future we need locations for c_arg_info
8220 See gcc.dg/Wshadow-3.c for an example of this problem. */
8221 decl
= build_decl (DECL_SOURCE_LOCATION (fndecl
),
8222 PARM_DECL
, TREE_VALUE (parm
), integer_type_node
);
8223 DECL_ARG_TYPE (decl
) = TREE_TYPE (decl
);
8225 warn_if_shadowing (decl
);
8228 pedwarn (DECL_SOURCE_LOCATION (decl
),
8229 0, "type of %qD defaults to %<int%>", decl
);
8231 warning_at (DECL_SOURCE_LOCATION (decl
),
8232 OPT_Wmissing_parameter_type
,
8233 "type of %qD defaults to %<int%>", decl
);
8236 TREE_PURPOSE (parm
) = decl
;
8237 pointer_set_insert (seen_args
, decl
);
8240 /* Now examine the parms chain for incomplete declarations
8241 and declarations with no corresponding names. */
8243 for (b
= current_scope
->bindings
; b
; b
= b
->prev
)
8246 if (TREE_CODE (parm
) != PARM_DECL
)
8249 if (TREE_TYPE (parm
) != error_mark_node
8250 && !COMPLETE_TYPE_P (TREE_TYPE (parm
)))
8252 error_at (DECL_SOURCE_LOCATION (parm
),
8253 "parameter %qD has incomplete type", parm
);
8254 TREE_TYPE (parm
) = error_mark_node
;
8257 if (!pointer_set_contains (seen_args
, parm
))
8259 error_at (DECL_SOURCE_LOCATION (parm
),
8260 "declaration for parameter %qD but no such parameter",
8263 /* Pretend the parameter was not missing.
8264 This gets us to a standard state and minimizes
8265 further error messages. */
8266 parmids
= chainon (parmids
, tree_cons (parm
, 0, 0));
8270 /* Chain the declarations together in the order of the list of
8271 names. Store that chain in the function decl, replacing the
8272 list of names. Update the current scope to match. */
8273 DECL_ARGUMENTS (fndecl
) = 0;
8275 for (parm
= parmids
; parm
; parm
= TREE_CHAIN (parm
))
8276 if (TREE_PURPOSE (parm
))
8278 if (parm
&& TREE_PURPOSE (parm
))
8280 last
= TREE_PURPOSE (parm
);
8281 DECL_ARGUMENTS (fndecl
) = last
;
8283 for (parm
= TREE_CHAIN (parm
); parm
; parm
= TREE_CHAIN (parm
))
8284 if (TREE_PURPOSE (parm
))
8286 DECL_CHAIN (last
) = TREE_PURPOSE (parm
);
8287 last
= TREE_PURPOSE (parm
);
8289 DECL_CHAIN (last
) = 0;
8292 pointer_set_destroy (seen_args
);
8294 /* If there was a previous prototype,
8295 set the DECL_ARG_TYPE of each argument according to
8296 the type previously specified, and report any mismatches. */
8298 if (current_function_prototype_arg_types
)
8301 for (parm
= DECL_ARGUMENTS (fndecl
),
8302 type
= current_function_prototype_arg_types
;
8303 parm
|| (type
&& TREE_VALUE (type
) != error_mark_node
8304 && (TYPE_MAIN_VARIANT (TREE_VALUE (type
)) != void_type_node
));
8305 parm
= DECL_CHAIN (parm
), type
= TREE_CHAIN (type
))
8307 if (parm
== 0 || type
== 0
8308 || TYPE_MAIN_VARIANT (TREE_VALUE (type
)) == void_type_node
)
8310 if (current_function_prototype_built_in
)
8311 warning_at (DECL_SOURCE_LOCATION (fndecl
),
8312 0, "number of arguments doesn%'t match "
8313 "built-in prototype");
8316 /* FIXME diagnostics: This should be the location of
8317 FNDECL, but there is bug when a prototype is
8318 declared inside function context, but defined
8319 outside of it (e.g., gcc.dg/pr15698-2.c). In
8320 which case FNDECL gets the location of the
8321 prototype, not the definition. */
8322 error_at (input_location
,
8323 "number of arguments doesn%'t match prototype");
8325 error_at (current_function_prototype_locus
,
8326 "prototype declaration");
8330 /* Type for passing arg must be consistent with that
8331 declared for the arg. ISO C says we take the unqualified
8332 type for parameters declared with qualified type. */
8333 if (TREE_TYPE (parm
) != error_mark_node
8334 && TREE_TYPE (type
) != error_mark_node
8335 && ((TYPE_ATOMIC (DECL_ARG_TYPE (parm
))
8336 != TYPE_ATOMIC (TREE_VALUE (type
)))
8337 || !comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm
)),
8338 TYPE_MAIN_VARIANT (TREE_VALUE (type
)))))
8340 if ((TYPE_ATOMIC (DECL_ARG_TYPE (parm
))
8341 == TYPE_ATOMIC (TREE_VALUE (type
)))
8342 && (TYPE_MAIN_VARIANT (TREE_TYPE (parm
))
8343 == TYPE_MAIN_VARIANT (TREE_VALUE (type
))))
8345 /* Adjust argument to match prototype. E.g. a previous
8346 `int foo(float);' prototype causes
8347 `int foo(x) float x; {...}' to be treated like
8348 `int foo(float x) {...}'. This is particularly
8349 useful for argument types like uid_t. */
8350 DECL_ARG_TYPE (parm
) = TREE_TYPE (parm
);
8352 if (targetm
.calls
.promote_prototypes (TREE_TYPE (current_function_decl
))
8353 && INTEGRAL_TYPE_P (TREE_TYPE (parm
))
8354 && TYPE_PRECISION (TREE_TYPE (parm
))
8355 < TYPE_PRECISION (integer_type_node
))
8356 DECL_ARG_TYPE (parm
)
8357 = c_type_promotes_to (TREE_TYPE (parm
));
8359 /* ??? Is it possible to get here with a
8360 built-in prototype or will it always have
8361 been diagnosed as conflicting with an
8362 old-style definition and discarded? */
8363 if (current_function_prototype_built_in
)
8364 warning_at (DECL_SOURCE_LOCATION (parm
),
8365 OPT_Wpedantic
, "promoted argument %qD "
8366 "doesn%'t match built-in prototype", parm
);
8369 pedwarn (DECL_SOURCE_LOCATION (parm
),
8370 OPT_Wpedantic
, "promoted argument %qD "
8371 "doesn%'t match prototype", parm
);
8372 pedwarn (current_function_prototype_locus
, OPT_Wpedantic
,
8373 "prototype declaration");
8378 if (current_function_prototype_built_in
)
8379 warning_at (DECL_SOURCE_LOCATION (parm
),
8380 0, "argument %qD doesn%'t match "
8381 "built-in prototype", parm
);
8384 error_at (DECL_SOURCE_LOCATION (parm
),
8385 "argument %qD doesn%'t match prototype", parm
);
8386 error_at (current_function_prototype_locus
,
8387 "prototype declaration");
8392 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl
)) = 0;
8395 /* Otherwise, create a prototype that would match. */
8399 tree actual
= 0, last
= 0, type
;
8401 for (parm
= DECL_ARGUMENTS (fndecl
); parm
; parm
= DECL_CHAIN (parm
))
8403 type
= tree_cons (NULL_TREE
, DECL_ARG_TYPE (parm
), NULL_TREE
);
8405 TREE_CHAIN (last
) = type
;
8410 type
= tree_cons (NULL_TREE
, void_type_node
, NULL_TREE
);
8412 TREE_CHAIN (last
) = type
;
8416 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
8417 of the type of this function, but we need to avoid having this
8418 affect the types of other similarly-typed functions, so we must
8419 first force the generation of an identical (but separate) type
8420 node for the relevant function type. The new node we create
8421 will be a variant of the main variant of the original function
8424 TREE_TYPE (fndecl
) = build_variant_type_copy (TREE_TYPE (fndecl
));
8426 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl
)) = actual
;
8430 /* Store parameter declarations passed in ARG_INFO into the current
8431 function declaration. */
8434 store_parm_decls_from (struct c_arg_info
*arg_info
)
8436 current_function_arg_info
= arg_info
;
8437 store_parm_decls ();
8440 /* Store the parameter declarations into the current function declaration.
8441 This is called after parsing the parameter declarations, before
8442 digesting the body of the function.
8444 For an old-style definition, construct a prototype out of the old-style
8445 parameter declarations and inject it into the function's type. */
8448 store_parm_decls (void)
8450 tree fndecl
= current_function_decl
;
8453 /* The argument information block for FNDECL. */
8454 struct c_arg_info
*arg_info
= current_function_arg_info
;
8455 current_function_arg_info
= 0;
8457 /* True if this definition is written with a prototype. Note:
8458 despite C99 6.7.5.3p14, we can *not* treat an empty argument
8459 list in a function definition as equivalent to (void) -- an
8460 empty argument list specifies the function has no parameters,
8461 but only (void) sets up a prototype for future calls. */
8462 proto
= arg_info
->types
!= 0;
8465 store_parm_decls_newstyle (fndecl
, arg_info
);
8467 store_parm_decls_oldstyle (fndecl
, arg_info
);
8469 /* The next call to push_scope will be a function body. */
8471 next_is_function_body
= true;
8473 /* Write a record describing this function definition to the prototypes
8474 file (if requested). */
8476 gen_aux_info_record (fndecl
, 1, 0, proto
);
8478 /* Initialize the RTL code for the function. */
8479 allocate_struct_function (fndecl
, false);
8481 if (warn_unused_local_typedefs
)
8482 cfun
->language
= ggc_alloc_cleared_language_function ();
8484 /* Begin the statement tree for this function. */
8485 DECL_SAVED_TREE (fndecl
) = push_stmt_list ();
8487 /* ??? Insert the contents of the pending sizes list into the function
8488 to be evaluated. The only reason left to have this is
8489 void foo(int n, int array[n++])
8490 because we throw away the array type in favor of a pointer type, and
8491 thus won't naturally see the SAVE_EXPR containing the increment. All
8492 other pending sizes would be handled by gimplify_parameters. */
8493 if (arg_info
->pending_sizes
)
8494 add_stmt (arg_info
->pending_sizes
);
8497 /* Store PARM_DECLs in PARMS into scope temporarily. Used for
8498 c_finish_omp_declare_simd for function prototypes. No diagnostics
8502 temp_store_parm_decls (tree fndecl
, tree parms
)
8505 for (tree p
= parms
; p
; p
= DECL_CHAIN (p
))
8507 DECL_CONTEXT (p
) = fndecl
;
8509 bind (DECL_NAME (p
), p
, current_scope
,
8510 /*invisible=*/false, /*nested=*/false,
8515 /* Undo what temp_store_parm_decls did. */
8518 temp_pop_parm_decls (void)
8520 /* Clear all bindings in this temporary scope, so that
8521 pop_scope doesn't create a BLOCK. */
8522 struct c_binding
*b
= current_scope
->bindings
;
8523 current_scope
->bindings
= NULL
;
8524 for (; b
; b
= free_binding_and_advance (b
))
8526 gcc_assert (TREE_CODE (b
->decl
) == PARM_DECL
);
8527 gcc_assert (I_SYMBOL_BINDING (b
->id
) == b
);
8528 I_SYMBOL_BINDING (b
->id
) = b
->shadowed
;
8529 if (b
->shadowed
&& b
->shadowed
->u
.type
)
8530 TREE_TYPE (b
->shadowed
->decl
) = b
->shadowed
->u
.type
;
8536 /* Finish up a function declaration and compile that function
8537 all the way to assembler language output. Then free the storage
8538 for the function definition.
8540 This is called after parsing the body of the function definition. */
8543 finish_function (void)
8545 tree fndecl
= current_function_decl
;
8547 if (c_dialect_objc ())
8548 objc_finish_function ();
8550 if (TREE_CODE (fndecl
) == FUNCTION_DECL
8551 && targetm
.calls
.promote_prototypes (TREE_TYPE (fndecl
)))
8553 tree args
= DECL_ARGUMENTS (fndecl
);
8554 for (; args
; args
= DECL_CHAIN (args
))
8556 tree type
= TREE_TYPE (args
);
8557 if (INTEGRAL_TYPE_P (type
)
8558 && TYPE_PRECISION (type
) < TYPE_PRECISION (integer_type_node
))
8559 DECL_ARG_TYPE (args
) = c_type_promotes_to (type
);
8563 if (DECL_INITIAL (fndecl
) && DECL_INITIAL (fndecl
) != error_mark_node
)
8564 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl
)) = fndecl
;
8566 /* Must mark the RESULT_DECL as being in this function. */
8568 if (DECL_RESULT (fndecl
) && DECL_RESULT (fndecl
) != error_mark_node
)
8569 DECL_CONTEXT (DECL_RESULT (fndecl
)) = fndecl
;
8571 if (MAIN_NAME_P (DECL_NAME (fndecl
)) && flag_hosted
8572 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl
)))
8573 == integer_type_node
&& flag_isoc99
)
8575 /* Hack. We don't want the middle-end to warn that this return
8576 is unreachable, so we mark its location as special. Using
8577 UNKNOWN_LOCATION has the problem that it gets clobbered in
8578 annotate_one_with_locus. A cleaner solution might be to
8579 ensure ! should_carry_locus_p (stmt), but that needs a flag.
8581 c_finish_return (BUILTINS_LOCATION
, integer_zero_node
, NULL_TREE
);
8584 /* Tie off the statement tree for this function. */
8585 DECL_SAVED_TREE (fndecl
) = pop_stmt_list (DECL_SAVED_TREE (fndecl
));
8587 /* If the function has _Cilk_spawn in front of a function call inside it
8588 i.e. it is a spawning function, then add the appropriate Cilk plus
8589 functions inside. */
8590 if (fn_contains_cilk_spawn_p (cfun
))
8591 cfun
->cilk_frame_decl
= insert_cilk_frame (fndecl
);
8593 finish_fname_decls ();
8595 /* Complain if there's just no return statement. */
8596 if (warn_return_type
8597 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl
))) != VOID_TYPE
8598 && !current_function_returns_value
&& !current_function_returns_null
8599 /* Don't complain if we are no-return. */
8600 && !current_function_returns_abnormally
8601 /* Don't complain if we are declared noreturn. */
8602 && !TREE_THIS_VOLATILE (fndecl
)
8603 /* Don't warn for main(). */
8604 && !MAIN_NAME_P (DECL_NAME (fndecl
))
8605 /* Or if they didn't actually specify a return type. */
8606 && !C_FUNCTION_IMPLICIT_INT (fndecl
)
8607 /* Normally, with -Wreturn-type, flow will complain, but we might
8608 optimize out static functions. */
8609 && !TREE_PUBLIC (fndecl
))
8611 warning (OPT_Wreturn_type
,
8612 "no return statement in function returning non-void");
8613 TREE_NO_WARNING (fndecl
) = 1;
8616 /* Complain about parameters that are only set, but never otherwise used. */
8617 if (warn_unused_but_set_parameter
)
8621 for (decl
= DECL_ARGUMENTS (fndecl
);
8623 decl
= DECL_CHAIN (decl
))
8624 if (TREE_USED (decl
)
8625 && TREE_CODE (decl
) == PARM_DECL
8626 && !DECL_READ_P (decl
)
8628 && !DECL_ARTIFICIAL (decl
)
8629 && !TREE_NO_WARNING (decl
))
8630 warning_at (DECL_SOURCE_LOCATION (decl
),
8631 OPT_Wunused_but_set_parameter
,
8632 "parameter %qD set but not used", decl
);
8635 /* Complain about locally defined typedefs that are not used in this
8637 maybe_warn_unused_local_typedefs ();
8639 /* Store the end of the function, so that we get good line number
8640 info for the epilogue. */
8641 cfun
->function_end_locus
= input_location
;
8643 /* Finalize the ELF visibility for the function. */
8644 c_determine_visibility (fndecl
);
8646 /* For GNU C extern inline functions disregard inline limits. */
8647 if (DECL_EXTERNAL (fndecl
)
8648 && DECL_DECLARED_INLINE_P (fndecl
))
8649 DECL_DISREGARD_INLINE_LIMITS (fndecl
) = 1;
8651 /* Genericize before inlining. Delay genericizing nested functions
8652 until their parent function is genericized. Since finalizing
8653 requires GENERIC, delay that as well. */
8655 if (DECL_INITIAL (fndecl
) && DECL_INITIAL (fndecl
) != error_mark_node
8656 && !undef_nested_function
)
8658 if (!decl_function_context (fndecl
))
8660 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE
, fndecl
);
8661 c_genericize (fndecl
);
8663 /* ??? Objc emits functions after finalizing the compilation unit.
8664 This should be cleaned up later and this conditional removed. */
8665 if (cgraph_global_info_ready
)
8667 cgraph_add_new_function (fndecl
, false);
8670 cgraph_finalize_function (fndecl
, false);
8674 /* Register this function with cgraph just far enough to get it
8675 added to our parent's nested function list. Handy, since the
8676 C front end doesn't have such a list. */
8677 (void) cgraph_get_create_node (fndecl
);
8681 if (!decl_function_context (fndecl
))
8682 undef_nested_function
= false;
8684 if (cfun
->language
!= NULL
)
8686 ggc_free (cfun
->language
);
8687 cfun
->language
= NULL
;
8690 /* We're leaving the context of this function, so zap cfun.
8691 It's still in DECL_STRUCT_FUNCTION, and we'll restore it in
8692 tree_rest_of_compilation. */
8694 current_function_decl
= NULL
;
8697 /* Check the declarations given in a for-loop for satisfying the C99
8698 constraints. If exactly one such decl is found, return it. LOC is
8699 the location of the opening parenthesis of the for loop. The last
8700 parameter allows you to control the "for loop initial declarations
8701 are only allowed in C99 mode". Normally, you should pass
8702 flag_isoc99 as that parameter. But in some cases (Objective-C
8703 foreach loop, for example) we want to run the checks in this
8704 function even if not in C99 mode, so we allow the caller to turn
8705 off the error about not being in C99 mode.
8709 check_for_loop_decls (location_t loc
, bool turn_off_iso_c99_error
)
8711 struct c_binding
*b
;
8712 tree one_decl
= NULL_TREE
;
8715 if (!turn_off_iso_c99_error
)
8717 static bool hint
= true;
8718 /* If we get here, declarations have been used in a for loop without
8719 the C99 for loop scope. This doesn't make much sense, so don't
8721 error_at (loc
, "%<for%> loop initial declarations "
8722 "are only allowed in C99 or C11 mode");
8726 "use option -std=c99, -std=gnu99, -std=c11 or -std=gnu11 "
8727 "to compile your code");
8732 /* C99 subclause 6.8.5 paragraph 3:
8734 [#3] The declaration part of a for statement shall only
8735 declare identifiers for objects having storage class auto or
8738 It isn't clear whether, in this sentence, "identifiers" binds to
8739 "shall only declare" or to "objects" - that is, whether all identifiers
8740 declared must be identifiers for objects, or whether the restriction
8741 only applies to those that are. (A question on this in comp.std.c
8742 in November 2000 received no answer.) We implement the strictest
8743 interpretation, to avoid creating an extension which later causes
8746 for (b
= current_scope
->bindings
; b
; b
= b
->prev
)
8749 tree decl
= b
->decl
;
8754 switch (TREE_CODE (decl
))
8758 location_t decl_loc
= DECL_SOURCE_LOCATION (decl
);
8759 if (TREE_STATIC (decl
))
8761 "declaration of static variable %qD in %<for%> loop "
8762 "initial declaration", decl
);
8763 else if (DECL_EXTERNAL (decl
))
8765 "declaration of %<extern%> variable %qD in %<for%> loop "
8766 "initial declaration", decl
);
8772 "%<struct %E%> declared in %<for%> loop initial "
8777 "%<union %E%> declared in %<for%> loop initial declaration",
8781 error_at (loc
, "%<enum %E%> declared in %<for%> loop "
8782 "initial declaration", id
);
8785 error_at (loc
, "declaration of non-variable "
8786 "%qD in %<for%> loop initial declaration", decl
);
8793 return n_decls
== 1 ? one_decl
: NULL_TREE
;
8796 /* Save and reinitialize the variables
8797 used during compilation of a C function. */
8800 c_push_function_context (void)
8802 struct language_function
*p
= cfun
->language
;
8803 /* cfun->language might have been already allocated by the use of
8804 -Wunused-local-typedefs. In that case, just re-use it. */
8806 cfun
->language
= p
= ggc_alloc_cleared_language_function ();
8808 p
->base
.x_stmt_tree
= c_stmt_tree
;
8809 c_stmt_tree
.x_cur_stmt_list
= vec_safe_copy (c_stmt_tree
.x_cur_stmt_list
);
8810 p
->x_break_label
= c_break_label
;
8811 p
->x_cont_label
= c_cont_label
;
8812 p
->x_switch_stack
= c_switch_stack
;
8813 p
->arg_info
= current_function_arg_info
;
8814 p
->returns_value
= current_function_returns_value
;
8815 p
->returns_null
= current_function_returns_null
;
8816 p
->returns_abnormally
= current_function_returns_abnormally
;
8817 p
->warn_about_return_type
= warn_about_return_type
;
8819 push_function_context ();
8822 /* Restore the variables used during compilation of a C function. */
8825 c_pop_function_context (void)
8827 struct language_function
*p
;
8829 pop_function_context ();
8832 /* When -Wunused-local-typedefs is in effect, cfun->languages is
8833 used to store data throughout the life time of the current cfun,
8834 So don't deallocate it. */
8835 if (!warn_unused_local_typedefs
)
8836 cfun
->language
= NULL
;
8838 if (DECL_STRUCT_FUNCTION (current_function_decl
) == 0
8839 && DECL_SAVED_TREE (current_function_decl
) == NULL_TREE
)
8841 /* Stop pointing to the local nodes about to be freed. */
8842 /* But DECL_INITIAL must remain nonzero so we know this
8843 was an actual function definition. */
8844 DECL_INITIAL (current_function_decl
) = error_mark_node
;
8845 DECL_ARGUMENTS (current_function_decl
) = 0;
8848 c_stmt_tree
= p
->base
.x_stmt_tree
;
8849 p
->base
.x_stmt_tree
.x_cur_stmt_list
= NULL
;
8850 c_break_label
= p
->x_break_label
;
8851 c_cont_label
= p
->x_cont_label
;
8852 c_switch_stack
= p
->x_switch_stack
;
8853 current_function_arg_info
= p
->arg_info
;
8854 current_function_returns_value
= p
->returns_value
;
8855 current_function_returns_null
= p
->returns_null
;
8856 current_function_returns_abnormally
= p
->returns_abnormally
;
8857 warn_about_return_type
= p
->warn_about_return_type
;
8860 /* The functions below are required for functionality of doing
8861 function at once processing in the C front end. Currently these
8862 functions are not called from anywhere in the C front end, but as
8863 these changes continue, that will change. */
8865 /* Returns the stmt_tree (if any) to which statements are currently
8866 being added. If there is no active statement-tree, NULL is
8870 current_stmt_tree (void)
8872 return &c_stmt_tree
;
8875 /* Return the global value of T as a symbol. */
8878 identifier_global_value (tree t
)
8880 struct c_binding
*b
;
8882 for (b
= I_SYMBOL_BINDING (t
); b
; b
= b
->shadowed
)
8883 if (B_IN_FILE_SCOPE (b
) || B_IN_EXTERNAL_SCOPE (b
))
8889 /* In C, the only C-linkage public declaration is at file scope. */
8892 c_linkage_bindings (tree name
)
8894 return identifier_global_value (name
);
8897 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
8898 otherwise the name is found in ridpointers from RID_INDEX. */
8901 record_builtin_type (enum rid rid_index
, const char *name
, tree type
)
8905 id
= ridpointers
[(int) rid_index
];
8907 id
= get_identifier (name
);
8908 decl
= build_decl (UNKNOWN_LOCATION
, TYPE_DECL
, id
, type
);
8910 if (debug_hooks
->type_decl
)
8911 debug_hooks
->type_decl (decl
, false);
8914 /* Build the void_list_node (void_type_node having been created). */
8916 build_void_list_node (void)
8918 tree t
= build_tree_list (NULL_TREE
, void_type_node
);
8922 /* Return a c_parm structure with the given SPECS, ATTRS and DECLARATOR. */
8925 build_c_parm (struct c_declspecs
*specs
, tree attrs
,
8926 struct c_declarator
*declarator
)
8928 struct c_parm
*ret
= XOBNEW (&parser_obstack
, struct c_parm
);
8931 ret
->declarator
= declarator
;
8935 /* Return a declarator with nested attributes. TARGET is the inner
8936 declarator to which these attributes apply. ATTRS are the
8939 struct c_declarator
*
8940 build_attrs_declarator (tree attrs
, struct c_declarator
*target
)
8942 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
8943 ret
->kind
= cdk_attrs
;
8944 ret
->declarator
= target
;
8945 ret
->u
.attrs
= attrs
;
8949 /* Return a declarator for a function with arguments specified by ARGS
8950 and return type specified by TARGET. */
8952 struct c_declarator
*
8953 build_function_declarator (struct c_arg_info
*args
,
8954 struct c_declarator
*target
)
8956 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
8957 ret
->kind
= cdk_function
;
8958 ret
->declarator
= target
;
8959 ret
->u
.arg_info
= args
;
8963 /* Return a declarator for the identifier IDENT (which may be
8964 NULL_TREE for an abstract declarator). */
8966 struct c_declarator
*
8967 build_id_declarator (tree ident
)
8969 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
8971 ret
->declarator
= 0;
8973 /* Default value - may get reset to a more precise location. */
8974 ret
->id_loc
= input_location
;
8978 /* Return something to represent absolute declarators containing a *.
8979 TARGET is the absolute declarator that the * contains.
8980 TYPE_QUALS_ATTRS is a structure for type qualifiers and attributes
8981 to apply to the pointer type. */
8983 struct c_declarator
*
8984 make_pointer_declarator (struct c_declspecs
*type_quals_attrs
,
8985 struct c_declarator
*target
)
8989 struct c_declarator
*itarget
= target
;
8990 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
8991 if (type_quals_attrs
)
8993 attrs
= type_quals_attrs
->attrs
;
8994 quals
= quals_from_declspecs (type_quals_attrs
);
8995 if (attrs
!= NULL_TREE
)
8996 itarget
= build_attrs_declarator (attrs
, target
);
8998 ret
->kind
= cdk_pointer
;
8999 ret
->declarator
= itarget
;
9000 ret
->u
.pointer_quals
= quals
;
9004 /* Return a pointer to a structure for an empty list of declaration
9007 struct c_declspecs
*
9008 build_null_declspecs (void)
9010 struct c_declspecs
*ret
= XOBNEW (&parser_obstack
, struct c_declspecs
);
9011 memset (&ret
->locations
, 0, cdw_number_of_elements
);
9016 ret
->align_log
= -1;
9017 ret
->typespec_word
= cts_none
;
9018 ret
->storage_class
= csc_none
;
9019 ret
->expr_const_operands
= true;
9020 ret
->declspecs_seen_p
= false;
9021 ret
->typespec_kind
= ctsk_none
;
9022 ret
->non_sc_seen_p
= false;
9023 ret
->typedef_p
= false;
9024 ret
->explicit_signed_p
= false;
9025 ret
->deprecated_p
= false;
9026 ret
->default_int_p
= false;
9027 ret
->long_p
= false;
9028 ret
->long_long_p
= false;
9029 ret
->short_p
= false;
9030 ret
->signed_p
= false;
9031 ret
->unsigned_p
= false;
9032 ret
->complex_p
= false;
9033 ret
->inline_p
= false;
9034 ret
->noreturn_p
= false;
9035 ret
->thread_p
= false;
9036 ret
->thread_gnu_p
= false;
9037 ret
->const_p
= false;
9038 ret
->volatile_p
= false;
9039 ret
->atomic_p
= false;
9040 ret
->restrict_p
= false;
9041 ret
->saturating_p
= false;
9042 ret
->alignas_p
= false;
9043 ret
->address_space
= ADDR_SPACE_GENERIC
;
9047 /* Add the address space ADDRSPACE to the declaration specifiers
9048 SPECS, returning SPECS. */
9050 struct c_declspecs
*
9051 declspecs_add_addrspace (source_location location
,
9052 struct c_declspecs
*specs
, addr_space_t as
)
9054 specs
->non_sc_seen_p
= true;
9055 specs
->declspecs_seen_p
= true;
9057 if (!ADDR_SPACE_GENERIC_P (specs
->address_space
)
9058 && specs
->address_space
!= as
)
9059 error ("incompatible address space qualifiers %qs and %qs",
9060 c_addr_space_name (as
),
9061 c_addr_space_name (specs
->address_space
));
9064 specs
->address_space
= as
;
9065 specs
->locations
[cdw_address_space
] = location
;
9070 /* Add the type qualifier QUAL to the declaration specifiers SPECS,
9073 struct c_declspecs
*
9074 declspecs_add_qual (source_location loc
,
9075 struct c_declspecs
*specs
, tree qual
)
9079 specs
->non_sc_seen_p
= true;
9080 specs
->declspecs_seen_p
= true;
9081 gcc_assert (TREE_CODE (qual
) == IDENTIFIER_NODE
9082 && C_IS_RESERVED_WORD (qual
));
9083 i
= C_RID_CODE (qual
);
9087 dupe
= specs
->const_p
;
9088 specs
->const_p
= true;
9089 specs
->locations
[cdw_const
] = loc
;
9092 dupe
= specs
->volatile_p
;
9093 specs
->volatile_p
= true;
9094 specs
->locations
[cdw_volatile
] = loc
;
9097 dupe
= specs
->restrict_p
;
9098 specs
->restrict_p
= true;
9099 specs
->locations
[cdw_restrict
] = loc
;
9102 dupe
= specs
->atomic_p
;
9103 specs
->atomic_p
= true;
9108 if (dupe
&& !flag_isoc99
)
9109 pedwarn (loc
, OPT_Wpedantic
, "duplicate %qE", qual
);
9113 /* Add the type specifier TYPE to the declaration specifiers SPECS,
9116 struct c_declspecs
*
9117 declspecs_add_type (location_t loc
, struct c_declspecs
*specs
,
9118 struct c_typespec spec
)
9120 tree type
= spec
.spec
;
9121 specs
->non_sc_seen_p
= true;
9122 specs
->declspecs_seen_p
= true;
9123 specs
->typespec_kind
= spec
.kind
;
9124 if (TREE_DEPRECATED (type
))
9125 specs
->deprecated_p
= true;
9127 /* Handle type specifier keywords. */
9128 if (TREE_CODE (type
) == IDENTIFIER_NODE
9129 && C_IS_RESERVED_WORD (type
)
9130 && C_RID_CODE (type
) != RID_CXX_COMPAT_WARN
)
9132 enum rid i
= C_RID_CODE (type
);
9135 error_at (loc
, "two or more data types in declaration specifiers");
9138 if ((int) i
<= (int) RID_LAST_MODIFIER
)
9140 /* "long", "short", "signed", "unsigned", "_Complex" or "_Sat". */
9145 if (specs
->long_long_p
)
9147 error_at (loc
, "%<long long long%> is too long for GCC");
9152 if (specs
->typespec_word
== cts_double
)
9155 ("both %<long long%> and %<double%> in "
9156 "declaration specifiers"));
9159 pedwarn_c90 (loc
, OPT_Wlong_long
,
9160 "ISO C90 does not support %<long long%>");
9161 specs
->long_long_p
= 1;
9162 specs
->locations
[cdw_long_long
] = loc
;
9167 ("both %<long%> and %<short%> in "
9168 "declaration specifiers"));
9169 else if (specs
->typespec_word
== cts_auto_type
)
9171 ("both %<long%> and %<__auto_type%> in "
9172 "declaration specifiers"));
9173 else if (specs
->typespec_word
== cts_void
)
9175 ("both %<long%> and %<void%> in "
9176 "declaration specifiers"));
9177 else if (specs
->typespec_word
== cts_int128
)
9179 ("both %<long%> and %<__int128%> in "
9180 "declaration specifiers"));
9181 else if (specs
->typespec_word
== cts_bool
)
9183 ("both %<long%> and %<_Bool%> in "
9184 "declaration specifiers"));
9185 else if (specs
->typespec_word
== cts_char
)
9187 ("both %<long%> and %<char%> in "
9188 "declaration specifiers"));
9189 else if (specs
->typespec_word
== cts_float
)
9191 ("both %<long%> and %<float%> in "
9192 "declaration specifiers"));
9193 else if (specs
->typespec_word
== cts_dfloat32
)
9195 ("both %<long%> and %<_Decimal32%> in "
9196 "declaration specifiers"));
9197 else if (specs
->typespec_word
== cts_dfloat64
)
9199 ("both %<long%> and %<_Decimal64%> in "
9200 "declaration specifiers"));
9201 else if (specs
->typespec_word
== cts_dfloat128
)
9203 ("both %<long%> and %<_Decimal128%> in "
9204 "declaration specifiers"));
9207 specs
->long_p
= true;
9208 specs
->locations
[cdw_long
] = loc
;
9212 dupe
= specs
->short_p
;
9215 ("both %<long%> and %<short%> in "
9216 "declaration specifiers"));
9217 else if (specs
->typespec_word
== cts_auto_type
)
9219 ("both %<short%> and %<__auto_type%> in "
9220 "declaration specifiers"));
9221 else if (specs
->typespec_word
== cts_void
)
9223 ("both %<short%> and %<void%> in "
9224 "declaration specifiers"));
9225 else if (specs
->typespec_word
== cts_int128
)
9227 ("both %<short%> and %<__int128%> in "
9228 "declaration specifiers"));
9229 else if (specs
->typespec_word
== cts_bool
)
9231 ("both %<short%> and %<_Bool%> in "
9232 "declaration specifiers"));
9233 else if (specs
->typespec_word
== cts_char
)
9235 ("both %<short%> and %<char%> in "
9236 "declaration specifiers"));
9237 else if (specs
->typespec_word
== cts_float
)
9239 ("both %<short%> and %<float%> in "
9240 "declaration specifiers"));
9241 else if (specs
->typespec_word
== cts_double
)
9243 ("both %<short%> and %<double%> in "
9244 "declaration specifiers"));
9245 else if (specs
->typespec_word
== cts_dfloat32
)
9247 ("both %<short%> and %<_Decimal32%> in "
9248 "declaration specifiers"));
9249 else if (specs
->typespec_word
== cts_dfloat64
)
9251 ("both %<short%> and %<_Decimal64%> in "
9252 "declaration specifiers"));
9253 else if (specs
->typespec_word
== cts_dfloat128
)
9255 ("both %<short%> and %<_Decimal128%> in "
9256 "declaration specifiers"));
9259 specs
->short_p
= true;
9260 specs
->locations
[cdw_short
] = loc
;
9264 dupe
= specs
->signed_p
;
9265 if (specs
->unsigned_p
)
9267 ("both %<signed%> and %<unsigned%> in "
9268 "declaration specifiers"));
9269 else if (specs
->typespec_word
== cts_auto_type
)
9271 ("both %<signed%> and %<__auto_type%> in "
9272 "declaration specifiers"));
9273 else if (specs
->typespec_word
== cts_void
)
9275 ("both %<signed%> and %<void%> in "
9276 "declaration specifiers"));
9277 else if (specs
->typespec_word
== cts_bool
)
9279 ("both %<signed%> and %<_Bool%> in "
9280 "declaration specifiers"));
9281 else if (specs
->typespec_word
== cts_float
)
9283 ("both %<signed%> and %<float%> in "
9284 "declaration specifiers"));
9285 else if (specs
->typespec_word
== cts_double
)
9287 ("both %<signed%> and %<double%> in "
9288 "declaration specifiers"));
9289 else if (specs
->typespec_word
== cts_dfloat32
)
9291 ("both %<signed%> and %<_Decimal32%> in "
9292 "declaration specifiers"));
9293 else if (specs
->typespec_word
== cts_dfloat64
)
9295 ("both %<signed%> and %<_Decimal64%> in "
9296 "declaration specifiers"));
9297 else if (specs
->typespec_word
== cts_dfloat128
)
9299 ("both %<signed%> and %<_Decimal128%> in "
9300 "declaration specifiers"));
9303 specs
->signed_p
= true;
9304 specs
->locations
[cdw_signed
] = loc
;
9308 dupe
= specs
->unsigned_p
;
9309 if (specs
->signed_p
)
9311 ("both %<signed%> and %<unsigned%> in "
9312 "declaration specifiers"));
9313 else if (specs
->typespec_word
== cts_auto_type
)
9315 ("both %<unsigned%> and %<__auto_type%> in "
9316 "declaration specifiers"));
9317 else if (specs
->typespec_word
== cts_void
)
9319 ("both %<unsigned%> and %<void%> in "
9320 "declaration specifiers"));
9321 else if (specs
->typespec_word
== cts_bool
)
9323 ("both %<unsigned%> and %<_Bool%> in "
9324 "declaration specifiers"));
9325 else if (specs
->typespec_word
== cts_float
)
9327 ("both %<unsigned%> and %<float%> in "
9328 "declaration specifiers"));
9329 else if (specs
->typespec_word
== cts_double
)
9331 ("both %<unsigned%> and %<double%> in "
9332 "declaration specifiers"));
9333 else if (specs
->typespec_word
== cts_dfloat32
)
9335 ("both %<unsigned%> and %<_Decimal32%> in "
9336 "declaration specifiers"));
9337 else if (specs
->typespec_word
== cts_dfloat64
)
9339 ("both %<unsigned%> and %<_Decimal64%> in "
9340 "declaration specifiers"));
9341 else if (specs
->typespec_word
== cts_dfloat128
)
9343 ("both %<unsigned%> and %<_Decimal128%> in "
9344 "declaration specifiers"));
9347 specs
->unsigned_p
= true;
9348 specs
->locations
[cdw_unsigned
] = loc
;
9352 dupe
= specs
->complex_p
;
9353 if (!flag_isoc99
&& !in_system_header_at (loc
))
9354 pedwarn (loc
, OPT_Wpedantic
,
9355 "ISO C90 does not support complex types");
9356 if (specs
->typespec_word
== cts_auto_type
)
9358 ("both %<complex%> and %<__auto_type%> in "
9359 "declaration specifiers"));
9360 else if (specs
->typespec_word
== cts_void
)
9362 ("both %<complex%> and %<void%> in "
9363 "declaration specifiers"));
9364 else if (specs
->typespec_word
== cts_bool
)
9366 ("both %<complex%> and %<_Bool%> in "
9367 "declaration specifiers"));
9368 else if (specs
->typespec_word
== cts_dfloat32
)
9370 ("both %<complex%> and %<_Decimal32%> in "
9371 "declaration specifiers"));
9372 else if (specs
->typespec_word
== cts_dfloat64
)
9374 ("both %<complex%> and %<_Decimal64%> in "
9375 "declaration specifiers"));
9376 else if (specs
->typespec_word
== cts_dfloat128
)
9378 ("both %<complex%> and %<_Decimal128%> in "
9379 "declaration specifiers"));
9380 else if (specs
->typespec_word
== cts_fract
)
9382 ("both %<complex%> and %<_Fract%> in "
9383 "declaration specifiers"));
9384 else if (specs
->typespec_word
== cts_accum
)
9386 ("both %<complex%> and %<_Accum%> in "
9387 "declaration specifiers"));
9388 else if (specs
->saturating_p
)
9390 ("both %<complex%> and %<_Sat%> in "
9391 "declaration specifiers"));
9394 specs
->complex_p
= true;
9395 specs
->locations
[cdw_complex
] = loc
;
9399 dupe
= specs
->saturating_p
;
9400 pedwarn (loc
, OPT_Wpedantic
,
9401 "ISO C does not support saturating types");
9402 if (specs
->typespec_word
== cts_int128
)
9405 ("both %<_Sat%> and %<__int128%> in "
9406 "declaration specifiers"));
9408 else if (specs
->typespec_word
== cts_auto_type
)
9410 ("both %<_Sat%> and %<__auto_type%> in "
9411 "declaration specifiers"));
9412 else if (specs
->typespec_word
== cts_void
)
9414 ("both %<_Sat%> and %<void%> in "
9415 "declaration specifiers"));
9416 else if (specs
->typespec_word
== cts_bool
)
9418 ("both %<_Sat%> and %<_Bool%> in "
9419 "declaration specifiers"));
9420 else if (specs
->typespec_word
== cts_char
)
9422 ("both %<_Sat%> and %<char%> in "
9423 "declaration specifiers"));
9424 else if (specs
->typespec_word
== cts_int
)
9426 ("both %<_Sat%> and %<int%> in "
9427 "declaration specifiers"));
9428 else if (specs
->typespec_word
== cts_float
)
9430 ("both %<_Sat%> and %<float%> in "
9431 "declaration specifiers"));
9432 else if (specs
->typespec_word
== cts_double
)
9434 ("both %<_Sat%> and %<double%> in "
9435 "declaration specifiers"));
9436 else if (specs
->typespec_word
== cts_dfloat32
)
9438 ("both %<_Sat%> and %<_Decimal32%> in "
9439 "declaration specifiers"));
9440 else if (specs
->typespec_word
== cts_dfloat64
)
9442 ("both %<_Sat%> and %<_Decimal64%> in "
9443 "declaration specifiers"));
9444 else if (specs
->typespec_word
== cts_dfloat128
)
9446 ("both %<_Sat%> and %<_Decimal128%> in "
9447 "declaration specifiers"));
9448 else if (specs
->complex_p
)
9450 ("both %<_Sat%> and %<complex%> in "
9451 "declaration specifiers"));
9454 specs
->saturating_p
= true;
9455 specs
->locations
[cdw_saturating
] = loc
;
9463 error_at (loc
, "duplicate %qE", type
);
9469 /* "void", "_Bool", "char", "int", "float", "double", "_Decimal32",
9470 "__int128", "_Decimal64", "_Decimal128", "_Fract", "_Accum" or
9472 if (specs
->typespec_word
!= cts_none
)
9475 "two or more data types in declaration specifiers");
9483 ("both %<long%> and %<__auto_type%> in "
9484 "declaration specifiers"));
9485 else if (specs
->short_p
)
9487 ("both %<short%> and %<__auto_type%> in "
9488 "declaration specifiers"));
9489 else if (specs
->signed_p
)
9491 ("both %<signed%> and %<__auto_type%> in "
9492 "declaration specifiers"));
9493 else if (specs
->unsigned_p
)
9495 ("both %<unsigned%> and %<__auto_type%> in "
9496 "declaration specifiers"));
9497 else if (specs
->complex_p
)
9499 ("both %<complex%> and %<__auto_type%> in "
9500 "declaration specifiers"));
9501 else if (specs
->saturating_p
)
9503 ("both %<_Sat%> and %<__auto_type%> in "
9504 "declaration specifiers"));
9507 specs
->typespec_word
= cts_auto_type
;
9508 specs
->locations
[cdw_typespec
] = loc
;
9512 if (int128_integer_type_node
== NULL_TREE
)
9514 error_at (loc
, "%<__int128%> is not supported for this target");
9517 if (!in_system_header_at (input_location
))
9518 pedwarn (loc
, OPT_Wpedantic
,
9519 "ISO C does not support %<__int128%> type");
9523 ("both %<__int128%> and %<long%> in "
9524 "declaration specifiers"));
9525 else if (specs
->saturating_p
)
9527 ("both %<_Sat%> and %<__int128%> in "
9528 "declaration specifiers"));
9529 else if (specs
->short_p
)
9531 ("both %<__int128%> and %<short%> in "
9532 "declaration specifiers"));
9535 specs
->typespec_word
= cts_int128
;
9536 specs
->locations
[cdw_typespec
] = loc
;
9542 ("both %<long%> and %<void%> in "
9543 "declaration specifiers"));
9544 else if (specs
->short_p
)
9546 ("both %<short%> and %<void%> in "
9547 "declaration specifiers"));
9548 else if (specs
->signed_p
)
9550 ("both %<signed%> and %<void%> in "
9551 "declaration specifiers"));
9552 else if (specs
->unsigned_p
)
9554 ("both %<unsigned%> and %<void%> in "
9555 "declaration specifiers"));
9556 else if (specs
->complex_p
)
9558 ("both %<complex%> and %<void%> in "
9559 "declaration specifiers"));
9560 else if (specs
->saturating_p
)
9562 ("both %<_Sat%> and %<void%> in "
9563 "declaration specifiers"));
9566 specs
->typespec_word
= cts_void
;
9567 specs
->locations
[cdw_typespec
] = loc
;
9571 if (!flag_isoc99
&& !in_system_header_at (loc
))
9572 pedwarn (loc
, OPT_Wpedantic
,
9573 "ISO C90 does not support boolean types");
9576 ("both %<long%> and %<_Bool%> in "
9577 "declaration specifiers"));
9578 else if (specs
->short_p
)
9580 ("both %<short%> and %<_Bool%> in "
9581 "declaration specifiers"));
9582 else if (specs
->signed_p
)
9584 ("both %<signed%> and %<_Bool%> in "
9585 "declaration specifiers"));
9586 else if (specs
->unsigned_p
)
9588 ("both %<unsigned%> and %<_Bool%> in "
9589 "declaration specifiers"));
9590 else if (specs
->complex_p
)
9592 ("both %<complex%> and %<_Bool%> in "
9593 "declaration specifiers"));
9594 else if (specs
->saturating_p
)
9596 ("both %<_Sat%> and %<_Bool%> in "
9597 "declaration specifiers"));
9600 specs
->typespec_word
= cts_bool
;
9601 specs
->locations
[cdw_typespec
] = loc
;
9607 ("both %<long%> and %<char%> in "
9608 "declaration specifiers"));
9609 else if (specs
->short_p
)
9611 ("both %<short%> and %<char%> in "
9612 "declaration specifiers"));
9613 else if (specs
->saturating_p
)
9615 ("both %<_Sat%> and %<char%> in "
9616 "declaration specifiers"));
9619 specs
->typespec_word
= cts_char
;
9620 specs
->locations
[cdw_typespec
] = loc
;
9624 if (specs
->saturating_p
)
9626 ("both %<_Sat%> and %<int%> in "
9627 "declaration specifiers"));
9630 specs
->typespec_word
= cts_int
;
9631 specs
->locations
[cdw_typespec
] = loc
;
9637 ("both %<long%> and %<float%> in "
9638 "declaration specifiers"));
9639 else if (specs
->short_p
)
9641 ("both %<short%> and %<float%> in "
9642 "declaration specifiers"));
9643 else if (specs
->signed_p
)
9645 ("both %<signed%> and %<float%> in "
9646 "declaration specifiers"));
9647 else if (specs
->unsigned_p
)
9649 ("both %<unsigned%> and %<float%> in "
9650 "declaration specifiers"));
9651 else if (specs
->saturating_p
)
9653 ("both %<_Sat%> and %<float%> in "
9654 "declaration specifiers"));
9657 specs
->typespec_word
= cts_float
;
9658 specs
->locations
[cdw_typespec
] = loc
;
9662 if (specs
->long_long_p
)
9664 ("both %<long long%> and %<double%> in "
9665 "declaration specifiers"));
9666 else if (specs
->short_p
)
9668 ("both %<short%> and %<double%> in "
9669 "declaration specifiers"));
9670 else if (specs
->signed_p
)
9672 ("both %<signed%> and %<double%> in "
9673 "declaration specifiers"));
9674 else if (specs
->unsigned_p
)
9676 ("both %<unsigned%> and %<double%> in "
9677 "declaration specifiers"));
9678 else if (specs
->saturating_p
)
9680 ("both %<_Sat%> and %<double%> in "
9681 "declaration specifiers"));
9684 specs
->typespec_word
= cts_double
;
9685 specs
->locations
[cdw_typespec
] = loc
;
9693 if (i
== RID_DFLOAT32
)
9695 else if (i
== RID_DFLOAT64
)
9698 str
= "_Decimal128";
9699 if (specs
->long_long_p
)
9701 ("both %<long long%> and %<%s%> in "
9702 "declaration specifiers"),
9706 ("both %<long%> and %<%s%> in "
9707 "declaration specifiers"),
9709 else if (specs
->short_p
)
9711 ("both %<short%> and %<%s%> in "
9712 "declaration specifiers"),
9714 else if (specs
->signed_p
)
9716 ("both %<signed%> and %<%s%> in "
9717 "declaration specifiers"),
9719 else if (specs
->unsigned_p
)
9721 ("both %<unsigned%> and %<%s%> in "
9722 "declaration specifiers"),
9724 else if (specs
->complex_p
)
9726 ("both %<complex%> and %<%s%> in "
9727 "declaration specifiers"),
9729 else if (specs
->saturating_p
)
9731 ("both %<_Sat%> and %<%s%> in "
9732 "declaration specifiers"),
9734 else if (i
== RID_DFLOAT32
)
9735 specs
->typespec_word
= cts_dfloat32
;
9736 else if (i
== RID_DFLOAT64
)
9737 specs
->typespec_word
= cts_dfloat64
;
9739 specs
->typespec_word
= cts_dfloat128
;
9740 specs
->locations
[cdw_typespec
] = loc
;
9742 if (!targetm
.decimal_float_supported_p ())
9744 ("decimal floating point not supported "
9745 "for this target"));
9746 pedwarn (loc
, OPT_Wpedantic
,
9747 "ISO C does not support decimal floating point");
9757 if (specs
->complex_p
)
9759 ("both %<complex%> and %<%s%> in "
9760 "declaration specifiers"),
9762 else if (i
== RID_FRACT
)
9763 specs
->typespec_word
= cts_fract
;
9765 specs
->typespec_word
= cts_accum
;
9766 specs
->locations
[cdw_typespec
] = loc
;
9768 if (!targetm
.fixed_point_supported_p ())
9770 "fixed-point types not supported for this target");
9771 pedwarn (loc
, OPT_Wpedantic
,
9772 "ISO C does not support fixed-point types");
9775 /* ObjC reserved word "id", handled below. */
9781 /* Now we have a typedef (a TYPE_DECL node), an identifier (some
9782 form of ObjC type, cases such as "int" and "long" being handled
9783 above), a TYPE (struct, union, enum and typeof specifiers) or an
9784 ERROR_MARK. In none of these cases may there have previously
9785 been any type specifiers. */
9786 if (specs
->type
|| specs
->typespec_word
!= cts_none
9787 || specs
->long_p
|| specs
->short_p
|| specs
->signed_p
9788 || specs
->unsigned_p
|| specs
->complex_p
)
9789 error_at (loc
, "two or more data types in declaration specifiers");
9790 else if (TREE_CODE (type
) == TYPE_DECL
)
9792 if (TREE_TYPE (type
) == error_mark_node
)
9793 ; /* Allow the type to default to int to avoid cascading errors. */
9796 specs
->type
= TREE_TYPE (type
);
9797 specs
->decl_attr
= DECL_ATTRIBUTES (type
);
9798 specs
->typedef_p
= true;
9799 specs
->explicit_signed_p
= C_TYPEDEF_EXPLICITLY_SIGNED (type
);
9800 specs
->locations
[cdw_typedef
] = loc
;
9802 /* If this typedef name is defined in a struct, then a C++
9803 lookup would return a different value. */
9805 && I_SYMBOL_BINDING (DECL_NAME (type
))->in_struct
)
9806 warning_at (loc
, OPT_Wc___compat
,
9807 "C++ lookup of %qD would return a field, not a type",
9810 /* If we are parsing a struct, record that a struct field
9812 if (warn_cxx_compat
&& struct_parse_info
!= NULL
)
9813 struct_parse_info
->typedefs_seen
.safe_push (type
);
9816 else if (TREE_CODE (type
) == IDENTIFIER_NODE
)
9818 tree t
= lookup_name (type
);
9819 if (!t
|| TREE_CODE (t
) != TYPE_DECL
)
9820 error_at (loc
, "%qE fails to be a typedef or built in type", type
);
9821 else if (TREE_TYPE (t
) == error_mark_node
)
9825 specs
->type
= TREE_TYPE (t
);
9826 specs
->locations
[cdw_typespec
] = loc
;
9831 if (TREE_CODE (type
) != ERROR_MARK
&& spec
.kind
== ctsk_typeof
)
9833 specs
->typedef_p
= true;
9834 specs
->locations
[cdw_typedef
] = loc
;
9838 specs
->expr
= build2 (COMPOUND_EXPR
, TREE_TYPE (spec
.expr
),
9839 specs
->expr
, spec
.expr
);
9841 specs
->expr
= spec
.expr
;
9842 specs
->expr_const_operands
&= spec
.expr_const_operands
;
9851 /* Add the storage class specifier or function specifier SCSPEC to the
9852 declaration specifiers SPECS, returning SPECS. */
9854 struct c_declspecs
*
9855 declspecs_add_scspec (source_location loc
,
9856 struct c_declspecs
*specs
,
9860 enum c_storage_class n
= csc_none
;
9862 specs
->declspecs_seen_p
= true;
9863 gcc_assert (TREE_CODE (scspec
) == IDENTIFIER_NODE
9864 && C_IS_RESERVED_WORD (scspec
));
9865 i
= C_RID_CODE (scspec
);
9866 if (specs
->non_sc_seen_p
)
9867 warning (OPT_Wold_style_declaration
,
9868 "%qE is not at beginning of declaration", scspec
);
9872 /* C99 permits duplicate inline. Although of doubtful utility,
9873 it seems simplest to permit it in gnu89 mode as well, as
9874 there is also little utility in maintaining this as a
9875 difference between gnu89 and C99 inline. */
9877 specs
->inline_p
= true;
9878 specs
->locations
[cdw_inline
] = loc
;
9881 /* Duplicate _Noreturn is permitted. */
9883 specs
->noreturn_p
= true;
9884 specs
->locations
[cdw_noreturn
] = loc
;
9887 dupe
= specs
->thread_p
;
9888 if (specs
->storage_class
== csc_auto
)
9889 error ("%qE used with %<auto%>", scspec
);
9890 else if (specs
->storage_class
== csc_register
)
9891 error ("%qE used with %<register%>", scspec
);
9892 else if (specs
->storage_class
== csc_typedef
)
9893 error ("%qE used with %<typedef%>", scspec
);
9896 specs
->thread_p
= true;
9897 specs
->thread_gnu_p
= (strcmp (IDENTIFIER_POINTER (scspec
),
9899 /* A diagnostic is not required for the use of this
9900 identifier in the implementation namespace; only diagnose
9901 it for the C11 spelling because of existing code using
9902 the other spelling. */
9903 if (!flag_isoc11
&& !specs
->thread_gnu_p
)
9906 pedwarn (loc
, OPT_Wpedantic
,
9907 "ISO C99 does not support %qE", scspec
);
9909 pedwarn (loc
, OPT_Wpedantic
,
9910 "ISO C90 does not support %qE", scspec
);
9912 specs
->locations
[cdw_thread
] = loc
;
9920 /* Diagnose "__thread extern". */
9921 if (specs
->thread_p
&& specs
->thread_gnu_p
)
9922 error ("%<__thread%> before %<extern%>");
9929 /* Diagnose "__thread static". */
9930 if (specs
->thread_p
&& specs
->thread_gnu_p
)
9931 error ("%<__thread%> before %<static%>");
9939 if (n
!= csc_none
&& n
== specs
->storage_class
)
9943 if (i
== RID_THREAD
)
9944 error ("duplicate %<_Thread_local%> or %<__thread%>");
9946 error ("duplicate %qE", scspec
);
9950 if (specs
->storage_class
!= csc_none
&& n
!= specs
->storage_class
)
9952 error ("multiple storage classes in declaration specifiers");
9956 specs
->storage_class
= n
;
9957 specs
->locations
[cdw_storage_class
] = loc
;
9958 if (n
!= csc_extern
&& n
!= csc_static
&& specs
->thread_p
)
9960 error ("%qs used with %qE",
9961 specs
->thread_gnu_p
? "__thread" : "_Thread_local",
9963 specs
->thread_p
= false;
9970 /* Add the attributes ATTRS to the declaration specifiers SPECS,
9973 struct c_declspecs
*
9974 declspecs_add_attrs (source_location loc
, struct c_declspecs
*specs
, tree attrs
)
9976 specs
->attrs
= chainon (attrs
, specs
->attrs
);
9977 specs
->locations
[cdw_attributes
] = loc
;
9978 specs
->declspecs_seen_p
= true;
9982 /* Add an _Alignas specifier (expression ALIGN, or type whose
9983 alignment is ALIGN) to the declaration specifiers SPECS, returning
9985 struct c_declspecs
*
9986 declspecs_add_alignas (source_location loc
,
9987 struct c_declspecs
*specs
, tree align
)
9990 specs
->alignas_p
= true;
9991 specs
->locations
[cdw_alignas
] = loc
;
9992 if (align
== error_mark_node
)
9994 align_log
= check_user_alignment (align
, true);
9995 if (align_log
> specs
->align_log
)
9996 specs
->align_log
= align_log
;
10000 /* Combine "long", "short", "signed", "unsigned" and "_Complex" type
10001 specifiers with any other type specifier to determine the resulting
10002 type. This is where ISO C checks on complex types are made, since
10003 "_Complex long" is a prefix of the valid ISO C type "_Complex long
10006 struct c_declspecs
*
10007 finish_declspecs (struct c_declspecs
*specs
)
10009 /* If a type was specified as a whole, we have no modifiers and are
10011 if (specs
->type
!= NULL_TREE
)
10013 gcc_assert (!specs
->long_p
&& !specs
->long_long_p
&& !specs
->short_p
10014 && !specs
->signed_p
&& !specs
->unsigned_p
10015 && !specs
->complex_p
);
10017 /* Set a dummy type. */
10018 if (TREE_CODE (specs
->type
) == ERROR_MARK
)
10019 specs
->type
= integer_type_node
;
10023 /* If none of "void", "_Bool", "char", "int", "float" or "double"
10024 has been specified, treat it as "int" unless "_Complex" is
10025 present and there are no other specifiers. If we just have
10026 "_Complex", it is equivalent to "_Complex double", but e.g.
10027 "_Complex short" is equivalent to "_Complex short int". */
10028 if (specs
->typespec_word
== cts_none
)
10030 if (specs
->saturating_p
)
10032 error_at (specs
->locations
[cdw_saturating
],
10033 "%<_Sat%> is used without %<_Fract%> or %<_Accum%>");
10034 if (!targetm
.fixed_point_supported_p ())
10035 error_at (specs
->locations
[cdw_saturating
],
10036 "fixed-point types not supported for this target");
10037 specs
->typespec_word
= cts_fract
;
10039 else if (specs
->long_p
|| specs
->short_p
10040 || specs
->signed_p
|| specs
->unsigned_p
)
10042 specs
->typespec_word
= cts_int
;
10044 else if (specs
->complex_p
)
10046 specs
->typespec_word
= cts_double
;
10047 pedwarn (specs
->locations
[cdw_complex
], OPT_Wpedantic
,
10048 "ISO C does not support plain %<complex%> meaning "
10049 "%<double complex%>");
10053 specs
->typespec_word
= cts_int
;
10054 specs
->default_int_p
= true;
10055 /* We don't diagnose this here because grokdeclarator will
10056 give more specific diagnostics according to whether it is
10057 a function definition. */
10061 /* If "signed" was specified, record this to distinguish "int" and
10062 "signed int" in the case of a bit-field with
10063 -funsigned-bitfields. */
10064 specs
->explicit_signed_p
= specs
->signed_p
;
10066 /* Now compute the actual type. */
10067 switch (specs
->typespec_word
)
10069 case cts_auto_type
:
10070 gcc_assert (!specs
->long_p
&& !specs
->short_p
10071 && !specs
->signed_p
&& !specs
->unsigned_p
10072 && !specs
->complex_p
);
10073 /* Type to be filled in later. */
10076 gcc_assert (!specs
->long_p
&& !specs
->short_p
10077 && !specs
->signed_p
&& !specs
->unsigned_p
10078 && !specs
->complex_p
);
10079 specs
->type
= void_type_node
;
10082 gcc_assert (!specs
->long_p
&& !specs
->short_p
10083 && !specs
->signed_p
&& !specs
->unsigned_p
10084 && !specs
->complex_p
);
10085 specs
->type
= boolean_type_node
;
10088 gcc_assert (!specs
->long_p
&& !specs
->short_p
);
10089 gcc_assert (!(specs
->signed_p
&& specs
->unsigned_p
));
10090 if (specs
->signed_p
)
10091 specs
->type
= signed_char_type_node
;
10092 else if (specs
->unsigned_p
)
10093 specs
->type
= unsigned_char_type_node
;
10095 specs
->type
= char_type_node
;
10096 if (specs
->complex_p
)
10098 pedwarn (specs
->locations
[cdw_complex
], OPT_Wpedantic
,
10099 "ISO C does not support complex integer types");
10100 specs
->type
= build_complex_type (specs
->type
);
10104 gcc_assert (!specs
->long_p
&& !specs
->short_p
&& !specs
->long_long_p
);
10105 gcc_assert (!(specs
->signed_p
&& specs
->unsigned_p
));
10106 specs
->type
= (specs
->unsigned_p
10107 ? int128_unsigned_type_node
10108 : int128_integer_type_node
);
10109 if (specs
->complex_p
)
10111 pedwarn (specs
->locations
[cdw_complex
], OPT_Wpedantic
,
10112 "ISO C does not support complex integer types");
10113 specs
->type
= build_complex_type (specs
->type
);
10117 gcc_assert (!(specs
->long_p
&& specs
->short_p
));
10118 gcc_assert (!(specs
->signed_p
&& specs
->unsigned_p
));
10119 if (specs
->long_long_p
)
10120 specs
->type
= (specs
->unsigned_p
10121 ? long_long_unsigned_type_node
10122 : long_long_integer_type_node
);
10123 else if (specs
->long_p
)
10124 specs
->type
= (specs
->unsigned_p
10125 ? long_unsigned_type_node
10126 : long_integer_type_node
);
10127 else if (specs
->short_p
)
10128 specs
->type
= (specs
->unsigned_p
10129 ? short_unsigned_type_node
10130 : short_integer_type_node
);
10132 specs
->type
= (specs
->unsigned_p
10133 ? unsigned_type_node
10134 : integer_type_node
);
10135 if (specs
->complex_p
)
10137 pedwarn (specs
->locations
[cdw_complex
], OPT_Wpedantic
,
10138 "ISO C does not support complex integer types");
10139 specs
->type
= build_complex_type (specs
->type
);
10143 gcc_assert (!specs
->long_p
&& !specs
->short_p
10144 && !specs
->signed_p
&& !specs
->unsigned_p
);
10145 specs
->type
= (specs
->complex_p
10146 ? complex_float_type_node
10147 : float_type_node
);
10150 gcc_assert (!specs
->long_long_p
&& !specs
->short_p
10151 && !specs
->signed_p
&& !specs
->unsigned_p
);
10154 specs
->type
= (specs
->complex_p
10155 ? complex_long_double_type_node
10156 : long_double_type_node
);
10160 specs
->type
= (specs
->complex_p
10161 ? complex_double_type_node
10162 : double_type_node
);
10167 case cts_dfloat128
:
10168 gcc_assert (!specs
->long_p
&& !specs
->long_long_p
&& !specs
->short_p
10169 && !specs
->signed_p
&& !specs
->unsigned_p
&& !specs
->complex_p
);
10170 if (specs
->typespec_word
== cts_dfloat32
)
10171 specs
->type
= dfloat32_type_node
;
10172 else if (specs
->typespec_word
== cts_dfloat64
)
10173 specs
->type
= dfloat64_type_node
;
10175 specs
->type
= dfloat128_type_node
;
10178 gcc_assert (!specs
->complex_p
);
10179 if (!targetm
.fixed_point_supported_p ())
10180 specs
->type
= integer_type_node
;
10181 else if (specs
->saturating_p
)
10183 if (specs
->long_long_p
)
10184 specs
->type
= specs
->unsigned_p
10185 ? sat_unsigned_long_long_fract_type_node
10186 : sat_long_long_fract_type_node
;
10187 else if (specs
->long_p
)
10188 specs
->type
= specs
->unsigned_p
10189 ? sat_unsigned_long_fract_type_node
10190 : sat_long_fract_type_node
;
10191 else if (specs
->short_p
)
10192 specs
->type
= specs
->unsigned_p
10193 ? sat_unsigned_short_fract_type_node
10194 : sat_short_fract_type_node
;
10196 specs
->type
= specs
->unsigned_p
10197 ? sat_unsigned_fract_type_node
10198 : sat_fract_type_node
;
10202 if (specs
->long_long_p
)
10203 specs
->type
= specs
->unsigned_p
10204 ? unsigned_long_long_fract_type_node
10205 : long_long_fract_type_node
;
10206 else if (specs
->long_p
)
10207 specs
->type
= specs
->unsigned_p
10208 ? unsigned_long_fract_type_node
10209 : long_fract_type_node
;
10210 else if (specs
->short_p
)
10211 specs
->type
= specs
->unsigned_p
10212 ? unsigned_short_fract_type_node
10213 : short_fract_type_node
;
10215 specs
->type
= specs
->unsigned_p
10216 ? unsigned_fract_type_node
10221 gcc_assert (!specs
->complex_p
);
10222 if (!targetm
.fixed_point_supported_p ())
10223 specs
->type
= integer_type_node
;
10224 else if (specs
->saturating_p
)
10226 if (specs
->long_long_p
)
10227 specs
->type
= specs
->unsigned_p
10228 ? sat_unsigned_long_long_accum_type_node
10229 : sat_long_long_accum_type_node
;
10230 else if (specs
->long_p
)
10231 specs
->type
= specs
->unsigned_p
10232 ? sat_unsigned_long_accum_type_node
10233 : sat_long_accum_type_node
;
10234 else if (specs
->short_p
)
10235 specs
->type
= specs
->unsigned_p
10236 ? sat_unsigned_short_accum_type_node
10237 : sat_short_accum_type_node
;
10239 specs
->type
= specs
->unsigned_p
10240 ? sat_unsigned_accum_type_node
10241 : sat_accum_type_node
;
10245 if (specs
->long_long_p
)
10246 specs
->type
= specs
->unsigned_p
10247 ? unsigned_long_long_accum_type_node
10248 : long_long_accum_type_node
;
10249 else if (specs
->long_p
)
10250 specs
->type
= specs
->unsigned_p
10251 ? unsigned_long_accum_type_node
10252 : long_accum_type_node
;
10253 else if (specs
->short_p
)
10254 specs
->type
= specs
->unsigned_p
10255 ? unsigned_short_accum_type_node
10256 : short_accum_type_node
;
10258 specs
->type
= specs
->unsigned_p
10259 ? unsigned_accum_type_node
10264 gcc_unreachable ();
10270 /* A subroutine of c_write_global_declarations. Perform final processing
10271 on one file scope's declarations (or the external scope's declarations),
10275 c_write_global_declarations_1 (tree globals
)
10280 /* Process the decls in the order they were written. */
10281 for (decl
= globals
; decl
; decl
= DECL_CHAIN (decl
))
10283 /* Check for used but undefined static functions using the C
10284 standard's definition of "used", and set TREE_NO_WARNING so
10285 that check_global_declarations doesn't repeat the check. */
10286 if (TREE_CODE (decl
) == FUNCTION_DECL
10287 && DECL_INITIAL (decl
) == 0
10288 && DECL_EXTERNAL (decl
)
10289 && !TREE_PUBLIC (decl
)
10290 && C_DECL_USED (decl
))
10292 pedwarn (input_location
, 0, "%q+F used but never defined", decl
);
10293 TREE_NO_WARNING (decl
) = 1;
10296 wrapup_global_declaration_1 (decl
);
10301 reconsider
= false;
10302 for (decl
= globals
; decl
; decl
= DECL_CHAIN (decl
))
10303 reconsider
|= wrapup_global_declaration_2 (decl
);
10305 while (reconsider
);
10307 for (decl
= globals
; decl
; decl
= DECL_CHAIN (decl
))
10308 check_global_declaration_1 (decl
);
10311 /* A subroutine of c_write_global_declarations Emit debug information for each
10312 of the declarations in GLOBALS. */
10315 c_write_global_declarations_2 (tree globals
)
10319 for (decl
= globals
; decl
; decl
= DECL_CHAIN (decl
))
10320 debug_hooks
->global_decl (decl
);
10323 /* Callback to collect a source_ref from a DECL. */
10326 collect_source_ref_cb (tree decl
)
10328 if (!DECL_IS_BUILTIN (decl
))
10329 collect_source_ref (LOCATION_FILE (decl_sloc (decl
, false)));
10332 /* Preserve the external declarations scope across a garbage collect. */
10333 static GTY(()) tree ext_block
;
10335 /* Collect all references relevant to SOURCE_FILE. */
10338 collect_all_refs (const char *source_file
)
10343 FOR_EACH_VEC_ELT (*all_translation_units
, i
, t
)
10344 collect_ada_nodes (BLOCK_VARS (DECL_INITIAL (t
)), source_file
);
10346 collect_ada_nodes (BLOCK_VARS (ext_block
), source_file
);
10349 /* Iterate over all global declarations and call CALLBACK. */
10352 for_each_global_decl (void (*callback
) (tree decl
))
10359 FOR_EACH_VEC_ELT (*all_translation_units
, i
, t
)
10361 decls
= DECL_INITIAL (t
);
10362 for (decl
= BLOCK_VARS (decls
); decl
; decl
= TREE_CHAIN (decl
))
10366 for (decl
= BLOCK_VARS (ext_block
); decl
; decl
= TREE_CHAIN (decl
))
10371 c_write_global_declarations (void)
10376 /* We don't want to do this if generating a PCH. */
10380 timevar_start (TV_PHASE_DEFERRED
);
10382 /* Do the Objective-C stuff. This is where all the Objective-C
10383 module stuff gets generated (symtab, class/protocol/selector
10385 if (c_dialect_objc ())
10386 objc_write_global_declarations ();
10388 /* Close the external scope. */
10389 ext_block
= pop_scope ();
10390 external_scope
= 0;
10391 gcc_assert (!current_scope
);
10393 /* Handle -fdump-ada-spec[-slim]. */
10394 if (flag_dump_ada_spec
|| flag_dump_ada_spec_slim
)
10396 /* Build a table of files to generate specs for */
10397 if (flag_dump_ada_spec_slim
)
10398 collect_source_ref (main_input_filename
);
10400 for_each_global_decl (collect_source_ref_cb
);
10402 dump_ada_specs (collect_all_refs
, NULL
);
10407 tree tmp
= BLOCK_VARS (ext_block
);
10409 FILE * stream
= dump_begin (TDI_tu
, &flags
);
10412 dump_node (tmp
, flags
& ~TDF_SLIM
, stream
);
10413 dump_end (TDI_tu
, stream
);
10417 /* Process all file scopes in this compilation, and the external_scope,
10418 through wrapup_global_declarations and check_global_declarations. */
10419 FOR_EACH_VEC_ELT (*all_translation_units
, i
, t
)
10420 c_write_global_declarations_1 (BLOCK_VARS (DECL_INITIAL (t
)));
10421 c_write_global_declarations_1 (BLOCK_VARS (ext_block
));
10423 timevar_stop (TV_PHASE_DEFERRED
);
10424 timevar_start (TV_PHASE_OPT_GEN
);
10426 /* We're done parsing; proceed to optimize and emit assembly.
10427 FIXME: shouldn't be the front end's responsibility to call this. */
10428 finalize_compilation_unit ();
10430 timevar_stop (TV_PHASE_OPT_GEN
);
10431 timevar_start (TV_PHASE_DBGINFO
);
10433 /* After cgraph has had a chance to emit everything that's going to
10434 be emitted, output debug information for globals. */
10435 if (!seen_error ())
10437 timevar_push (TV_SYMOUT
);
10438 FOR_EACH_VEC_ELT (*all_translation_units
, i
, t
)
10439 c_write_global_declarations_2 (BLOCK_VARS (DECL_INITIAL (t
)));
10440 c_write_global_declarations_2 (BLOCK_VARS (ext_block
));
10441 timevar_pop (TV_SYMOUT
);
10445 timevar_stop (TV_PHASE_DBGINFO
);
10448 /* Register reserved keyword WORD as qualifier for address space AS. */
10451 c_register_addr_space (const char *word
, addr_space_t as
)
10453 int rid
= RID_FIRST_ADDR_SPACE
+ as
;
10456 /* Address space qualifiers are only supported
10457 in C with GNU extensions enabled. */
10458 if (c_dialect_objc () || flag_no_asm
)
10461 id
= get_identifier (word
);
10462 C_SET_RID_CODE (id
, rid
);
10463 C_IS_RESERVED_WORD (id
) = 1;
10464 ridpointers
[rid
] = id
;
10467 /* Return identifier to look up for omp declare reduction. */
10470 c_omp_reduction_id (enum tree_code reduction_code
, tree reduction_id
)
10472 const char *p
= NULL
;
10473 switch (reduction_code
)
10475 case PLUS_EXPR
: p
= "+"; break;
10476 case MULT_EXPR
: p
= "*"; break;
10477 case MINUS_EXPR
: p
= "-"; break;
10478 case BIT_AND_EXPR
: p
= "&"; break;
10479 case BIT_XOR_EXPR
: p
= "^"; break;
10480 case BIT_IOR_EXPR
: p
= "|"; break;
10481 case TRUTH_ANDIF_EXPR
: p
= "&&"; break;
10482 case TRUTH_ORIF_EXPR
: p
= "||"; break;
10483 case MIN_EXPR
: p
= "min"; break;
10484 case MAX_EXPR
: p
= "max"; break;
10491 if (TREE_CODE (reduction_id
) != IDENTIFIER_NODE
)
10492 return error_mark_node
;
10493 p
= IDENTIFIER_POINTER (reduction_id
);
10496 const char prefix
[] = "omp declare reduction ";
10497 size_t lenp
= sizeof (prefix
);
10498 size_t len
= strlen (p
);
10499 char *name
= XALLOCAVEC (char, lenp
+ len
);
10500 memcpy (name
, prefix
, lenp
- 1);
10501 memcpy (name
+ lenp
- 1, p
, len
+ 1);
10502 return get_identifier (name
);
10505 /* Lookup REDUCTION_ID in the current scope, or create an artificial
10506 VAR_DECL, bind it into the current scope and return it. */
10509 c_omp_reduction_decl (tree reduction_id
)
10511 struct c_binding
*b
= I_SYMBOL_BINDING (reduction_id
);
10512 if (b
!= NULL
&& B_IN_CURRENT_SCOPE (b
))
10515 tree decl
= build_decl (BUILTINS_LOCATION
, VAR_DECL
,
10516 reduction_id
, integer_type_node
);
10517 DECL_ARTIFICIAL (decl
) = 1;
10518 DECL_EXTERNAL (decl
) = 1;
10519 TREE_STATIC (decl
) = 1;
10520 TREE_PUBLIC (decl
) = 0;
10521 bind (reduction_id
, decl
, current_scope
, true, false, BUILTINS_LOCATION
);
10525 /* Lookup REDUCTION_ID in the first scope where it has entry for TYPE. */
10528 c_omp_reduction_lookup (tree reduction_id
, tree type
)
10530 struct c_binding
*b
= I_SYMBOL_BINDING (reduction_id
);
10534 for (t
= DECL_INITIAL (b
->decl
); t
; t
= TREE_CHAIN (t
))
10535 if (comptypes (TREE_PURPOSE (t
), type
))
10536 return TREE_VALUE (t
);
10539 return error_mark_node
;
10542 /* Helper function called via walk_tree, to diagnose invalid
10543 #pragma omp declare reduction combiners or initializers. */
10546 c_check_omp_declare_reduction_r (tree
*tp
, int *, void *data
)
10548 tree
*vars
= (tree
*) data
;
10549 if (SSA_VAR_P (*tp
)
10550 && !DECL_ARTIFICIAL (*tp
)
10554 location_t loc
= DECL_SOURCE_LOCATION (vars
[0]);
10555 if (strcmp (IDENTIFIER_POINTER (DECL_NAME (vars
[0])), "omp_out") == 0)
10556 error_at (loc
, "%<#pragma omp declare reduction%> combiner refers to "
10557 "variable %qD which is not %<omp_out%> nor %<omp_in%>",
10560 error_at (loc
, "%<#pragma omp declare reduction%> initializer refers "
10561 "to variable %qD which is not %<omp_priv%> nor "
10569 #include "gt-c-c-decl.h"