1 /* Process declarations and variables for C compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
3 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
4 Free Software Foundation, Inc.
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 3, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
22 /* Process declarations and symbol lookup for C front end.
23 Also constructs types; the standard scalar types at initialization,
24 and structure, union, array and enum types when they are declared. */
26 /* ??? not all decl nodes are given the most useful possible
27 line numbers. For example, the CONST_DECLs for enum values. */
31 #include "coretypes.h"
36 #include "tree-inline.h"
48 #include "c-family/c-common.h"
49 #include "c-family/c-objc.h"
50 #include "c-family/c-pragma.h"
52 #include "langhooks.h"
53 #include "tree-mudflap.h"
54 #include "tree-iterator.h"
55 #include "diagnostic-core.h"
56 #include "tree-dump.h"
59 #include "langhooks-def.h"
60 #include "pointer-set.h"
62 #include "c-family/c-ada-spec.h"
64 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
66 { NORMAL
, /* Ordinary declaration */
67 FUNCDEF
, /* Function definition */
68 PARM
, /* Declaration of parm before function body */
69 FIELD
, /* Declaration inside struct or union */
70 TYPENAME
}; /* Typename (inside cast or sizeof) */
72 /* States indicating how grokdeclarator() should handle declspecs marked
73 with __attribute__((deprecated)). An object declared as
74 __attribute__((deprecated)) suppresses warnings of uses of other
77 enum deprecated_states
{
83 /* Nonzero if we have seen an invalid cross reference
84 to a struct, union, or enum, but not yet printed the message. */
85 tree pending_invalid_xref
;
87 /* File and line to appear in the eventual error message. */
88 location_t pending_invalid_xref_location
;
90 /* The file and line that the prototype came from if this is an
91 old-style definition; used for diagnostics in
92 store_parm_decls_oldstyle. */
94 static location_t current_function_prototype_locus
;
96 /* Whether this prototype was built-in. */
98 static bool current_function_prototype_built_in
;
100 /* The argument type information of this prototype. */
102 static tree current_function_prototype_arg_types
;
104 /* The argument information structure for the function currently being
107 static struct c_arg_info
*current_function_arg_info
;
109 /* The obstack on which parser and related data structures, which are
110 not live beyond their top-level declaration or definition, are
112 struct obstack parser_obstack
;
114 /* The current statement tree. */
116 static GTY(()) struct stmt_tree_s c_stmt_tree
;
118 /* State saving variables. */
122 /* A list of decls to be made automatically visible in each file scope. */
123 static GTY(()) tree visible_builtins
;
125 /* Set to 0 at beginning of a function definition, set to 1 if
126 a return statement that specifies a return value is seen. */
128 int current_function_returns_value
;
130 /* Set to 0 at beginning of a function definition, set to 1 if
131 a return statement with no argument is seen. */
133 int current_function_returns_null
;
135 /* Set to 0 at beginning of a function definition, set to 1 if
136 a call to a noreturn function is seen. */
138 int current_function_returns_abnormally
;
140 /* Set to nonzero by `grokdeclarator' for a function
141 whose return type is defaulted, if warnings for this are desired. */
143 static int warn_about_return_type
;
145 /* Nonzero when the current toplevel function contains a declaration
146 of a nested function which is never defined. */
148 static bool undef_nested_function
;
150 /* True means global_bindings_p should return false even if the scope stack
151 says we are in file scope. */
152 bool c_override_global_bindings_to_false
;
155 /* Each c_binding structure describes one binding of an identifier to
156 a decl. All the decls in a scope - irrespective of namespace - are
157 chained together by the ->prev field, which (as the name implies)
158 runs in reverse order. All the decls in a given namespace bound to
159 a given identifier are chained by the ->shadowed field, which runs
160 from inner to outer scopes.
162 The ->decl field usually points to a DECL node, but there are two
163 exceptions. In the namespace of type tags, the bound entity is a
164 RECORD_TYPE, UNION_TYPE, or ENUMERAL_TYPE node. If an undeclared
165 identifier is encountered, it is bound to error_mark_node to
166 suppress further errors about that identifier in the current
169 The ->u.type field stores the type of the declaration in this scope;
170 if NULL, the type is the type of the ->decl field. This is only of
171 relevance for objects with external or internal linkage which may
172 be redeclared in inner scopes, forming composite types that only
173 persist for the duration of those scopes. In the external scope,
174 this stores the composite of all the types declared for this
175 object, visible or not. The ->inner_comp field (used only at file
176 scope) stores whether an incomplete array type at file scope was
177 completed at an inner scope to an array size other than 1.
179 The ->u.label field is used for labels. It points to a structure
180 which stores additional information used for warnings.
182 The depth field is copied from the scope structure that holds this
183 decl. It is used to preserve the proper ordering of the ->shadowed
184 field (see bind()) and also for a handful of special-case checks.
185 Finally, the invisible bit is true for a decl which should be
186 ignored for purposes of normal name lookup, and the nested bit is
187 true for a decl that's been bound a second time in an inner scope;
188 in all such cases, the binding in the outer scope will have its
189 invisible bit true. */
191 struct GTY((chain_next ("%h.prev"))) c_binding
{
192 union GTY(()) { /* first so GTY desc can use decl */
193 tree
GTY((tag ("0"))) type
; /* the type in this scope */
194 struct c_label_vars
* GTY((tag ("1"))) label
; /* for warnings */
195 } GTY((desc ("TREE_CODE (%0.decl) == LABEL_DECL"))) u
;
196 tree decl
; /* the decl bound */
197 tree id
; /* the identifier it's bound to */
198 struct c_binding
*prev
; /* the previous decl in this scope */
199 struct c_binding
*shadowed
; /* the innermost decl shadowed by this one */
200 unsigned int depth
: 28; /* depth of this scope */
201 BOOL_BITFIELD invisible
: 1; /* normal lookup should ignore this binding */
202 BOOL_BITFIELD nested
: 1; /* do not set DECL_CONTEXT when popping */
203 BOOL_BITFIELD inner_comp
: 1; /* incomplete array completed in inner scope */
204 BOOL_BITFIELD in_struct
: 1; /* currently defined as struct field */
205 location_t locus
; /* location for nested bindings */
207 #define B_IN_SCOPE(b1, b2) ((b1)->depth == (b2)->depth)
208 #define B_IN_CURRENT_SCOPE(b) ((b)->depth == current_scope->depth)
209 #define B_IN_FILE_SCOPE(b) ((b)->depth == 1 /*file_scope->depth*/)
210 #define B_IN_EXTERNAL_SCOPE(b) ((b)->depth == 0 /*external_scope->depth*/)
212 #define I_SYMBOL_BINDING(node) \
213 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->symbol_binding)
214 #define I_SYMBOL_DECL(node) \
215 (I_SYMBOL_BINDING(node) ? I_SYMBOL_BINDING(node)->decl : 0)
217 #define I_TAG_BINDING(node) \
218 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->tag_binding)
219 #define I_TAG_DECL(node) \
220 (I_TAG_BINDING(node) ? I_TAG_BINDING(node)->decl : 0)
222 #define I_LABEL_BINDING(node) \
223 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->label_binding)
224 #define I_LABEL_DECL(node) \
225 (I_LABEL_BINDING(node) ? I_LABEL_BINDING(node)->decl : 0)
227 /* Each C symbol points to three linked lists of c_binding structures.
228 These describe the values of the identifier in the three different
229 namespaces defined by the language. */
231 struct GTY(()) lang_identifier
{
232 struct c_common_identifier common_id
;
233 struct c_binding
*symbol_binding
; /* vars, funcs, constants, typedefs */
234 struct c_binding
*tag_binding
; /* struct/union/enum tags */
235 struct c_binding
*label_binding
; /* labels */
238 /* Validate c-lang.c's assumptions. */
239 extern char C_SIZEOF_STRUCT_LANG_IDENTIFIER_isnt_accurate
240 [(sizeof(struct lang_identifier
) == C_SIZEOF_STRUCT_LANG_IDENTIFIER
) ? 1 : -1];
242 /* The resulting tree type. */
244 union GTY((desc ("TREE_CODE (&%h.generic) == IDENTIFIER_NODE"),
245 chain_next ("TREE_CODE (&%h.generic) == INTEGER_TYPE ? (union lang_tree_node *) TYPE_NEXT_VARIANT (&%h.generic) : CODE_CONTAINS_STRUCT (TREE_CODE (&%h.generic), TS_COMMON) ? ((union lang_tree_node *) TREE_CHAIN (&%h.generic)) : NULL"))) lang_tree_node
247 union tree_node
GTY ((tag ("0"),
248 desc ("tree_node_structure (&%h)")))
250 struct lang_identifier
GTY ((tag ("1"))) identifier
;
253 /* Track bindings and other things that matter for goto warnings. For
254 efficiency, we do not gather all the decls at the point of
255 definition. Instead, we point into the bindings structure. As
256 scopes are popped, we update these structures and gather the decls
257 that matter at that time. */
259 struct GTY(()) c_spot_bindings
{
260 /* The currently open scope which holds bindings defined when the
261 label was defined or the goto statement was found. */
262 struct c_scope
*scope
;
263 /* The bindings in the scope field which were defined at the point
264 of the label or goto. This lets us look at older or newer
265 bindings in the scope, as appropriate. */
266 struct c_binding
*bindings_in_scope
;
267 /* The number of statement expressions that have started since this
268 label or goto statement was defined. This is zero if we are at
269 the same statement expression level. It is positive if we are in
270 a statement expression started since this spot. It is negative
271 if this spot was in a statement expression and we have left
274 /* Whether we started in a statement expression but are no longer in
275 it. This is set to true if stmt_exprs ever goes negative. */
279 /* This structure is used to keep track of bindings seen when a goto
280 statement is defined. This is only used if we see the goto
281 statement before we see the label. */
283 struct GTY(()) c_goto_bindings
{
284 /* The location of the goto statement. */
286 /* The bindings of the goto statement. */
287 struct c_spot_bindings goto_bindings
;
290 typedef struct c_goto_bindings
*c_goto_bindings_p
;
291 DEF_VEC_P(c_goto_bindings_p
);
292 DEF_VEC_ALLOC_P(c_goto_bindings_p
,gc
);
294 /* The additional information we keep track of for a label binding.
295 These fields are updated as scopes are popped. */
297 struct GTY(()) c_label_vars
{
298 /* The shadowed c_label_vars, when one label shadows another (which
299 can only happen using a __label__ declaration). */
300 struct c_label_vars
*shadowed
;
301 /* The bindings when the label was defined. */
302 struct c_spot_bindings label_bindings
;
303 /* A list of decls that we care about: decls about which we should
304 warn if a goto branches to this label from later in the function.
305 Decls are added to this list as scopes are popped. We only add
306 the decls that matter. */
307 VEC(tree
,gc
) *decls_in_scope
;
308 /* A list of goto statements to this label. This is only used for
309 goto statements seen before the label was defined, so that we can
310 issue appropriate warnings for them. */
311 VEC(c_goto_bindings_p
,gc
) *gotos
;
314 /* Each c_scope structure describes the complete contents of one
315 scope. Four scopes are distinguished specially: the innermost or
316 current scope, the innermost function scope, the file scope (always
317 the second to outermost) and the outermost or external scope.
319 Most declarations are recorded in the current scope.
321 All normal label declarations are recorded in the innermost
322 function scope, as are bindings of undeclared identifiers to
323 error_mark_node. (GCC permits nested functions as an extension,
324 hence the 'innermost' qualifier.) Explicitly declared labels
325 (using the __label__ extension) appear in the current scope.
327 Being in the file scope (current_scope == file_scope) causes
328 special behavior in several places below. Also, under some
329 conditions the Objective-C front end records declarations in the
330 file scope even though that isn't the current scope.
332 All declarations with external linkage are recorded in the external
333 scope, even if they aren't visible there; this models the fact that
334 such declarations are visible to the entire program, and (with a
335 bit of cleverness, see pushdecl) allows diagnosis of some violations
336 of C99 6.2.2p7 and 6.2.7p2:
338 If, within the same translation unit, the same identifier appears
339 with both internal and external linkage, the behavior is
342 All declarations that refer to the same object or function shall
343 have compatible type; otherwise, the behavior is undefined.
345 Initially only the built-in declarations, which describe compiler
346 intrinsic functions plus a subset of the standard library, are in
349 The order of the blocks list matters, and it is frequently appended
350 to. To avoid having to walk all the way to the end of the list on
351 each insertion, or reverse the list later, we maintain a pointer to
352 the last list entry. (FIXME: It should be feasible to use a reversed
355 The bindings list is strictly in reverse order of declarations;
356 pop_scope relies on this. */
359 struct GTY((chain_next ("%h.outer"))) c_scope
{
360 /* The scope containing this one. */
361 struct c_scope
*outer
;
363 /* The next outermost function scope. */
364 struct c_scope
*outer_function
;
366 /* All bindings in this scope. */
367 struct c_binding
*bindings
;
369 /* For each scope (except the global one), a chain of BLOCK nodes
370 for all the scopes that were entered and exited one level down. */
374 /* The depth of this scope. Used to keep the ->shadowed chain of
375 bindings sorted innermost to outermost. */
376 unsigned int depth
: 28;
378 /* True if we are currently filling this scope with parameter
380 BOOL_BITFIELD parm_flag
: 1;
382 /* True if we saw [*] in this scope. Used to give an error messages
383 if these appears in a function definition. */
384 BOOL_BITFIELD had_vla_unspec
: 1;
386 /* True if we already complained about forward parameter decls
387 in this scope. This prevents double warnings on
388 foo (int a; int b; ...) */
389 BOOL_BITFIELD warned_forward_parm_decls
: 1;
391 /* True if this is the outermost block scope of a function body.
392 This scope contains the parameters, the local variables declared
393 in the outermost block, and all the labels (except those in
394 nested functions, or declared at block scope with __label__). */
395 BOOL_BITFIELD function_body
: 1;
397 /* True means make a BLOCK for this scope no matter what. */
398 BOOL_BITFIELD keep
: 1;
400 /* True means that an unsuffixed float constant is _Decimal64. */
401 BOOL_BITFIELD float_const_decimal64
: 1;
403 /* True if this scope has any label bindings. This is used to speed
404 up searching for labels when popping scopes, particularly since
405 labels are normally only found at function scope. */
406 BOOL_BITFIELD has_label_bindings
: 1;
408 /* True if we should issue a warning if a goto statement crosses any
409 of the bindings. We still need to check the list of bindings to
410 find the specific ones we need to warn about. This is true if
411 decl_jump_unsafe would return true for any of the bindings. This
412 is used to avoid looping over all the bindings unnecessarily. */
413 BOOL_BITFIELD has_jump_unsafe_decl
: 1;
416 /* The scope currently in effect. */
418 static GTY(()) struct c_scope
*current_scope
;
420 /* The innermost function scope. Ordinary (not explicitly declared)
421 labels, bindings to error_mark_node, and the lazily-created
422 bindings of __func__ and its friends get this scope. */
424 static GTY(()) struct c_scope
*current_function_scope
;
426 /* The C file scope. This is reset for each input translation unit. */
428 static GTY(()) struct c_scope
*file_scope
;
430 /* The outermost scope. This is used for all declarations with
431 external linkage, and only these, hence the name. */
433 static GTY(()) struct c_scope
*external_scope
;
435 /* A chain of c_scope structures awaiting reuse. */
437 static GTY((deletable
)) struct c_scope
*scope_freelist
;
439 /* A chain of c_binding structures awaiting reuse. */
441 static GTY((deletable
)) struct c_binding
*binding_freelist
;
443 /* Append VAR to LIST in scope SCOPE. */
444 #define SCOPE_LIST_APPEND(scope, list, decl) do { \
445 struct c_scope *s_ = (scope); \
447 if (s_->list##_last) \
448 BLOCK_CHAIN (s_->list##_last) = d_; \
451 s_->list##_last = d_; \
454 /* Concatenate FROM in scope FSCOPE onto TO in scope TSCOPE. */
455 #define SCOPE_LIST_CONCAT(tscope, to, fscope, from) do { \
456 struct c_scope *t_ = (tscope); \
457 struct c_scope *f_ = (fscope); \
459 BLOCK_CHAIN (t_->to##_last) = f_->from; \
462 t_->to##_last = f_->from##_last; \
465 /* A c_inline_static structure stores details of a static identifier
466 referenced in a definition of a function that may be an inline
467 definition if no subsequent declaration of that function uses
468 "extern" or does not use "inline". */
470 struct GTY((chain_next ("%h.next"))) c_inline_static
{
471 /* The location for a diagnostic. */
474 /* The function that may be an inline definition. */
477 /* The object or function referenced. */
480 /* What sort of reference this is. */
481 enum c_inline_static_type type
;
483 /* The next such structure or NULL. */
484 struct c_inline_static
*next
;
487 /* List of static identifiers used or referenced in functions that may
488 be inline definitions. */
489 static GTY(()) struct c_inline_static
*c_inline_statics
;
491 /* True means unconditionally make a BLOCK for the next scope pushed. */
493 static bool keep_next_level_flag
;
495 /* True means the next call to push_scope will be the outermost scope
496 of a function body, so do not push a new scope, merely cease
497 expecting parameter decls. */
499 static bool next_is_function_body
;
501 /* A VEC of pointers to c_binding structures. */
503 typedef struct c_binding
*c_binding_ptr
;
504 DEF_VEC_P(c_binding_ptr
);
505 DEF_VEC_ALLOC_P(c_binding_ptr
,heap
);
507 /* Information that we keep for a struct or union while it is being
510 struct c_struct_parse_info
512 /* If warn_cxx_compat, a list of types defined within this
514 VEC(tree
,heap
) *struct_types
;
515 /* If warn_cxx_compat, a list of field names which have bindings,
516 and which are defined in this struct, but which are not defined
517 in any enclosing struct. This is used to clear the in_struct
518 field of the c_bindings structure. */
519 VEC(c_binding_ptr
,heap
) *fields
;
520 /* If warn_cxx_compat, a list of typedef names used when defining
521 fields in this struct. */
522 VEC(tree
,heap
) *typedefs_seen
;
525 /* Information for the struct or union currently being parsed, or
526 NULL if not parsing a struct or union. */
527 static struct c_struct_parse_info
*struct_parse_info
;
529 /* Forward declarations. */
530 static tree
lookup_name_in_scope (tree
, struct c_scope
*);
531 static tree
c_make_fname_decl (location_t
, tree
, int);
532 static tree
grokdeclarator (const struct c_declarator
*,
533 struct c_declspecs
*,
534 enum decl_context
, bool, tree
*, tree
*, tree
*,
535 bool *, enum deprecated_states
);
536 static tree
grokparms (struct c_arg_info
*, bool);
537 static void layout_array_type (tree
);
539 /* T is a statement. Add it to the statement-tree. This is the
540 C/ObjC version--C++ has a slightly different version of this
546 enum tree_code code
= TREE_CODE (t
);
548 if (CAN_HAVE_LOCATION_P (t
) && code
!= LABEL_EXPR
)
550 if (!EXPR_HAS_LOCATION (t
))
551 SET_EXPR_LOCATION (t
, input_location
);
554 if (code
== LABEL_EXPR
|| code
== CASE_LABEL_EXPR
)
555 STATEMENT_LIST_HAS_LABEL (cur_stmt_list
) = 1;
557 /* Add T to the statement-tree. Non-side-effect statements need to be
558 recorded during statement expressions. */
559 append_to_statement_list_force (t
, &cur_stmt_list
);
564 /* Return true if we will want to say something if a goto statement
568 decl_jump_unsafe (tree decl
)
570 if (decl
== error_mark_node
|| TREE_TYPE (decl
) == error_mark_node
)
573 /* Always warn about crossing variably modified types. */
574 if ((TREE_CODE (decl
) == VAR_DECL
|| TREE_CODE (decl
) == TYPE_DECL
)
575 && variably_modified_type_p (TREE_TYPE (decl
), NULL_TREE
))
578 /* Otherwise, only warn if -Wgoto-misses-init and this is an
579 initialized automatic decl. */
580 if (warn_jump_misses_init
581 && TREE_CODE (decl
) == VAR_DECL
582 && !TREE_STATIC (decl
)
583 && DECL_INITIAL (decl
) != NULL_TREE
)
591 c_print_identifier (FILE *file
, tree node
, int indent
)
593 print_node (file
, "symbol", I_SYMBOL_DECL (node
), indent
+ 4);
594 print_node (file
, "tag", I_TAG_DECL (node
), indent
+ 4);
595 print_node (file
, "label", I_LABEL_DECL (node
), indent
+ 4);
596 if (C_IS_RESERVED_WORD (node
) && C_RID_CODE (node
) != RID_CXX_COMPAT_WARN
)
598 tree rid
= ridpointers
[C_RID_CODE (node
)];
599 indent_to (file
, indent
+ 4);
600 fprintf (file
, "rid " HOST_PTR_PRINTF
" \"%s\"",
601 (void *) rid
, IDENTIFIER_POINTER (rid
));
605 /* Establish a binding between NAME, an IDENTIFIER_NODE, and DECL,
606 which may be any of several kinds of DECL or TYPE or error_mark_node,
607 in the scope SCOPE. */
609 bind (tree name
, tree decl
, struct c_scope
*scope
, bool invisible
,
610 bool nested
, location_t locus
)
612 struct c_binding
*b
, **here
;
614 if (binding_freelist
)
616 b
= binding_freelist
;
617 binding_freelist
= b
->prev
;
620 b
= ggc_alloc_c_binding ();
625 b
->depth
= scope
->depth
;
626 b
->invisible
= invisible
;
634 b
->prev
= scope
->bindings
;
637 if (decl_jump_unsafe (decl
))
638 scope
->has_jump_unsafe_decl
= 1;
643 switch (TREE_CODE (decl
))
645 case LABEL_DECL
: here
= &I_LABEL_BINDING (name
); break;
648 case RECORD_TYPE
: here
= &I_TAG_BINDING (name
); break;
654 case ERROR_MARK
: here
= &I_SYMBOL_BINDING (name
); break;
660 /* Locate the appropriate place in the chain of shadowed decls
661 to insert this binding. Normally, scope == current_scope and
662 this does nothing. */
663 while (*here
&& (*here
)->depth
> scope
->depth
)
664 here
= &(*here
)->shadowed
;
670 /* Clear the binding structure B, stick it on the binding_freelist,
671 and return the former value of b->prev. This is used by pop_scope
672 and get_parm_info to iterate destructively over all the bindings
673 from a given scope. */
674 static struct c_binding
*
675 free_binding_and_advance (struct c_binding
*b
)
677 struct c_binding
*prev
= b
->prev
;
679 memset (b
, 0, sizeof (struct c_binding
));
680 b
->prev
= binding_freelist
;
681 binding_freelist
= b
;
686 /* Bind a label. Like bind, but skip fields which aren't used for
687 labels, and add the LABEL_VARS value. */
689 bind_label (tree name
, tree label
, struct c_scope
*scope
,
690 struct c_label_vars
*label_vars
)
694 bind (name
, label
, scope
, /*invisible=*/false, /*nested=*/false,
697 scope
->has_label_bindings
= true;
700 gcc_assert (b
->decl
== label
);
701 label_vars
->shadowed
= b
->u
.label
;
702 b
->u
.label
= label_vars
;
705 /* Hook called at end of compilation to assume 1 elt
706 for a file-scope tentative array defn that wasn't complete before. */
709 c_finish_incomplete_decl (tree decl
)
711 if (TREE_CODE (decl
) == VAR_DECL
)
713 tree type
= TREE_TYPE (decl
);
714 if (type
!= error_mark_node
715 && TREE_CODE (type
) == ARRAY_TYPE
716 && !DECL_EXTERNAL (decl
)
717 && TYPE_DOMAIN (type
) == 0)
719 warning_at (DECL_SOURCE_LOCATION (decl
),
720 0, "array %q+D assumed to have one element", decl
);
722 complete_array_type (&TREE_TYPE (decl
), NULL_TREE
, true);
724 layout_decl (decl
, 0);
729 /* Record that inline function FUNC contains a reference (location
730 LOC) to static DECL (file-scope or function-local according to
734 record_inline_static (location_t loc
, tree func
, tree decl
,
735 enum c_inline_static_type type
)
737 struct c_inline_static
*csi
= ggc_alloc_c_inline_static ();
739 csi
->function
= func
;
740 csi
->static_decl
= decl
;
742 csi
->next
= c_inline_statics
;
743 c_inline_statics
= csi
;
746 /* Check for references to static declarations in inline functions at
747 the end of the translation unit and diagnose them if the functions
748 are still inline definitions. */
751 check_inline_statics (void)
753 struct c_inline_static
*csi
;
754 for (csi
= c_inline_statics
; csi
; csi
= csi
->next
)
756 if (DECL_EXTERNAL (csi
->function
))
760 pedwarn (csi
->location
, 0,
761 "%qD is static but used in inline function %qD "
762 "which is not static", csi
->static_decl
, csi
->function
);
765 pedwarn (csi
->location
, 0,
766 "%q+D is static but declared in inline function %qD "
767 "which is not static", csi
->static_decl
, csi
->function
);
773 c_inline_statics
= NULL
;
776 /* Fill in a c_spot_bindings structure. If DEFINING is true, set it
777 for the current state, otherwise set it to uninitialized. */
780 set_spot_bindings (struct c_spot_bindings
*p
, bool defining
)
784 p
->scope
= current_scope
;
785 p
->bindings_in_scope
= current_scope
->bindings
;
790 p
->bindings_in_scope
= NULL
;
793 p
->left_stmt_expr
= false;
796 /* Update spot bindings P as we pop out of SCOPE. Return true if we
797 should push decls for a label. */
800 update_spot_bindings (struct c_scope
*scope
, struct c_spot_bindings
*p
)
802 if (p
->scope
!= scope
)
804 /* This label or goto is defined in some other scope, or it is a
805 label which is not yet defined. There is nothing to
810 /* Adjust the spot bindings to refer to the bindings already defined
811 in the enclosing scope. */
812 p
->scope
= scope
->outer
;
813 p
->bindings_in_scope
= p
->scope
->bindings
;
818 /* The Objective-C front-end often needs to determine the current scope. */
821 objc_get_current_scope (void)
823 return current_scope
;
826 /* The following function is used only by Objective-C. It needs to live here
827 because it accesses the innards of c_scope. */
830 objc_mark_locals_volatile (void *enclosing_blk
)
832 struct c_scope
*scope
;
835 for (scope
= current_scope
;
836 scope
&& scope
!= enclosing_blk
;
837 scope
= scope
->outer
)
839 for (b
= scope
->bindings
; b
; b
= b
->prev
)
840 objc_volatilize_decl (b
->decl
);
842 /* Do not climb up past the current function. */
843 if (scope
->function_body
)
848 /* Return true if we are in the global binding level. */
851 global_bindings_p (void)
853 return current_scope
== file_scope
&& !c_override_global_bindings_to_false
;
857 keep_next_level (void)
859 keep_next_level_flag
= true;
862 /* Set the flag for the FLOAT_CONST_DECIMAL64 pragma being ON. */
865 set_float_const_decimal64 (void)
867 current_scope
->float_const_decimal64
= true;
870 /* Clear the flag for the FLOAT_CONST_DECIMAL64 pragma. */
873 clear_float_const_decimal64 (void)
875 current_scope
->float_const_decimal64
= false;
878 /* Return nonzero if an unsuffixed float constant is _Decimal64. */
881 float_const_decimal64_p (void)
883 return current_scope
->float_const_decimal64
;
886 /* Identify this scope as currently being filled with parameters. */
889 declare_parm_level (void)
891 current_scope
->parm_flag
= true;
897 if (next_is_function_body
)
899 /* This is the transition from the parameters to the top level
900 of the function body. These are the same scope
901 (C99 6.2.1p4,6) so we do not push another scope structure.
902 next_is_function_body is set only by store_parm_decls, which
903 in turn is called when and only when we are about to
904 encounter the opening curly brace for the function body.
906 The outermost block of a function always gets a BLOCK node,
907 because the debugging output routines expect that each
908 function has at least one BLOCK. */
909 current_scope
->parm_flag
= false;
910 current_scope
->function_body
= true;
911 current_scope
->keep
= true;
912 current_scope
->outer_function
= current_function_scope
;
913 current_function_scope
= current_scope
;
915 keep_next_level_flag
= false;
916 next_is_function_body
= false;
918 /* The FLOAT_CONST_DECIMAL64 pragma applies to nested scopes. */
919 if (current_scope
->outer
)
920 current_scope
->float_const_decimal64
921 = current_scope
->outer
->float_const_decimal64
;
923 current_scope
->float_const_decimal64
= false;
927 struct c_scope
*scope
;
930 scope
= scope_freelist
;
931 scope_freelist
= scope
->outer
;
934 scope
= ggc_alloc_cleared_c_scope ();
936 /* The FLOAT_CONST_DECIMAL64 pragma applies to nested scopes. */
938 scope
->float_const_decimal64
= current_scope
->float_const_decimal64
;
940 scope
->float_const_decimal64
= false;
942 scope
->keep
= keep_next_level_flag
;
943 scope
->outer
= current_scope
;
944 scope
->depth
= current_scope
? (current_scope
->depth
+ 1) : 0;
946 /* Check for scope depth overflow. Unlikely (2^28 == 268,435,456) but
948 if (current_scope
&& scope
->depth
== 0)
951 sorry ("GCC supports only %u nested scopes", scope
->depth
);
954 current_scope
= scope
;
955 keep_next_level_flag
= false;
959 /* This is called when we are leaving SCOPE. For each label defined
960 in SCOPE, add any appropriate decls to its decls_in_scope fields.
961 These are the decls whose initialization will be skipped by a goto
962 later in the function. */
965 update_label_decls (struct c_scope
*scope
)
972 if (s
->has_label_bindings
)
976 for (b
= s
->bindings
; b
!= NULL
; b
= b
->prev
)
978 struct c_label_vars
*label_vars
;
979 struct c_binding
*b1
;
982 struct c_goto_bindings
*g
;
984 if (TREE_CODE (b
->decl
) != LABEL_DECL
)
986 label_vars
= b
->u
.label
;
988 b1
= label_vars
->label_bindings
.bindings_in_scope
;
989 if (label_vars
->label_bindings
.scope
== NULL
)
992 hjud
= label_vars
->label_bindings
.scope
->has_jump_unsafe_decl
;
993 if (update_spot_bindings (scope
, &label_vars
->label_bindings
))
995 /* This label is defined in this scope. */
998 for (; b1
!= NULL
; b1
= b1
->prev
)
1000 /* A goto from later in the function to this
1001 label will never see the initialization
1002 of B1, if any. Save it to issue a
1003 warning if needed. */
1004 if (decl_jump_unsafe (b1
->decl
))
1005 VEC_safe_push (tree
, gc
,
1006 label_vars
->decls_in_scope
,
1012 /* Update the bindings of any goto statements associated
1014 FOR_EACH_VEC_ELT (c_goto_bindings_p
, label_vars
->gotos
, ix
, g
)
1015 update_spot_bindings (scope
, &g
->goto_bindings
);
1019 /* Don't search beyond the current function. */
1020 if (s
== current_function_scope
)
1027 /* Set the TYPE_CONTEXT of all of TYPE's variants to CONTEXT. */
1030 set_type_context (tree type
, tree context
)
1032 for (type
= TYPE_MAIN_VARIANT (type
); type
;
1033 type
= TYPE_NEXT_VARIANT (type
))
1034 TYPE_CONTEXT (type
) = context
;
1037 /* Exit a scope. Restore the state of the identifier-decl mappings
1038 that were in effect when this scope was entered. Return a BLOCK
1039 node containing all the DECLs in this scope that are of interest
1040 to debug info generation. */
1045 struct c_scope
*scope
= current_scope
;
1046 tree block
, context
, p
;
1047 struct c_binding
*b
;
1049 bool functionbody
= scope
->function_body
;
1050 bool keep
= functionbody
|| scope
->keep
|| scope
->bindings
;
1052 update_label_decls (scope
);
1054 /* If appropriate, create a BLOCK to record the decls for the life
1055 of this function. */
1059 block
= make_node (BLOCK
);
1060 BLOCK_SUBBLOCKS (block
) = scope
->blocks
;
1061 TREE_USED (block
) = 1;
1063 /* In each subblock, record that this is its superior. */
1064 for (p
= scope
->blocks
; p
; p
= BLOCK_CHAIN (p
))
1065 BLOCK_SUPERCONTEXT (p
) = block
;
1067 BLOCK_VARS (block
) = 0;
1070 /* The TYPE_CONTEXTs for all of the tagged types belonging to this
1071 scope must be set so that they point to the appropriate
1072 construct, i.e. either to the current FUNCTION_DECL node, or
1073 else to the BLOCK node we just constructed.
1075 Note that for tagged types whose scope is just the formal
1076 parameter list for some function type specification, we can't
1077 properly set their TYPE_CONTEXTs here, because we don't have a
1078 pointer to the appropriate FUNCTION_TYPE node readily available
1079 to us. For those cases, the TYPE_CONTEXTs of the relevant tagged
1080 type nodes get set in `grokdeclarator' as soon as we have created
1081 the FUNCTION_TYPE node which will represent the "scope" for these
1082 "parameter list local" tagged types. */
1083 if (scope
->function_body
)
1084 context
= current_function_decl
;
1085 else if (scope
== file_scope
)
1087 tree file_decl
= build_translation_unit_decl (NULL_TREE
);
1088 context
= file_decl
;
1093 /* Clear all bindings in this scope. */
1094 for (b
= scope
->bindings
; b
; b
= free_binding_and_advance (b
))
1097 switch (TREE_CODE (p
))
1100 /* Warnings for unused labels, errors for undefined labels. */
1101 if (TREE_USED (p
) && !DECL_INITIAL (p
))
1103 error ("label %q+D used but not defined", p
);
1104 DECL_INITIAL (p
) = error_mark_node
;
1107 warn_for_unused_label (p
);
1109 /* Labels go in BLOCK_VARS. */
1110 DECL_CHAIN (p
) = BLOCK_VARS (block
);
1111 BLOCK_VARS (block
) = p
;
1112 gcc_assert (I_LABEL_BINDING (b
->id
) == b
);
1113 I_LABEL_BINDING (b
->id
) = b
->shadowed
;
1115 /* Also pop back to the shadowed label_vars. */
1116 release_tree_vector (b
->u
.label
->decls_in_scope
);
1117 b
->u
.label
= b
->u
.label
->shadowed
;
1123 set_type_context (p
, context
);
1125 /* Types may not have tag-names, in which case the type
1126 appears in the bindings list with b->id NULL. */
1129 gcc_assert (I_TAG_BINDING (b
->id
) == b
);
1130 I_TAG_BINDING (b
->id
) = b
->shadowed
;
1135 /* Propagate TREE_ADDRESSABLE from nested functions to their
1136 containing functions. */
1137 if (!TREE_ASM_WRITTEN (p
)
1138 && DECL_INITIAL (p
) != 0
1139 && TREE_ADDRESSABLE (p
)
1140 && DECL_ABSTRACT_ORIGIN (p
) != 0
1141 && DECL_ABSTRACT_ORIGIN (p
) != p
)
1142 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (p
)) = 1;
1143 if (!DECL_EXTERNAL (p
)
1144 && !DECL_INITIAL (p
)
1145 && scope
!= file_scope
1146 && scope
!= external_scope
)
1148 error ("nested function %q+D declared but never defined", p
);
1149 undef_nested_function
= true;
1151 else if (DECL_DECLARED_INLINE_P (p
)
1153 && !DECL_INITIAL (p
))
1155 /* C99 6.7.4p6: "a function with external linkage... declared
1156 with an inline function specifier ... shall also be defined
1157 in the same translation unit." */
1158 if (!flag_gnu89_inline
)
1159 pedwarn (input_location
, 0,
1160 "inline function %q+D declared but never defined", p
);
1161 DECL_EXTERNAL (p
) = 1;
1167 /* Warnings for unused variables. */
1168 if ((!TREE_USED (p
) || !DECL_READ_P (p
))
1169 && !TREE_NO_WARNING (p
)
1170 && !DECL_IN_SYSTEM_HEADER (p
)
1172 && !DECL_ARTIFICIAL (p
)
1173 && scope
!= file_scope
1174 && scope
!= external_scope
)
1177 warning (OPT_Wunused_variable
, "unused variable %q+D", p
);
1178 else if (DECL_CONTEXT (p
) == current_function_decl
)
1179 warning_at (DECL_SOURCE_LOCATION (p
),
1180 OPT_Wunused_but_set_variable
,
1181 "variable %qD set but not used", p
);
1186 error ("type of array %q+D completed incompatibly with"
1187 " implicit initialization", p
);
1194 /* All of these go in BLOCK_VARS, but only if this is the
1195 binding in the home scope. */
1198 DECL_CHAIN (p
) = BLOCK_VARS (block
);
1199 BLOCK_VARS (block
) = p
;
1201 else if (VAR_OR_FUNCTION_DECL_P (p
))
1203 /* For block local externs add a special
1204 DECL_EXTERNAL decl for debug info generation. */
1205 tree extp
= copy_node (p
);
1207 DECL_EXTERNAL (extp
) = 1;
1208 TREE_STATIC (extp
) = 0;
1209 TREE_PUBLIC (extp
) = 1;
1210 DECL_INITIAL (extp
) = NULL_TREE
;
1211 DECL_LANG_SPECIFIC (extp
) = NULL
;
1212 DECL_CONTEXT (extp
) = current_function_decl
;
1213 if (TREE_CODE (p
) == FUNCTION_DECL
)
1215 DECL_RESULT (extp
) = NULL_TREE
;
1216 DECL_SAVED_TREE (extp
) = NULL_TREE
;
1217 DECL_STRUCT_FUNCTION (extp
) = NULL
;
1219 if (b
->locus
!= UNKNOWN_LOCATION
)
1220 DECL_SOURCE_LOCATION (extp
) = b
->locus
;
1221 DECL_CHAIN (extp
) = BLOCK_VARS (block
);
1222 BLOCK_VARS (block
) = extp
;
1224 /* If this is the file scope set DECL_CONTEXT of each decl to
1225 the TRANSLATION_UNIT_DECL. This makes same_translation_unit_p
1227 if (scope
== file_scope
)
1229 DECL_CONTEXT (p
) = context
;
1230 if (TREE_CODE (p
) == TYPE_DECL
1231 && TREE_TYPE (p
) != error_mark_node
)
1232 set_type_context (TREE_TYPE (p
), context
);
1236 /* Parameters go in DECL_ARGUMENTS, not BLOCK_VARS, and have
1237 already been put there by store_parm_decls. Unused-
1238 parameter warnings are handled by function.c.
1239 error_mark_node obviously does not go in BLOCK_VARS and
1240 does not get unused-variable warnings. */
1243 /* It is possible for a decl not to have a name. We get
1244 here with b->id NULL in this case. */
1247 gcc_assert (I_SYMBOL_BINDING (b
->id
) == b
);
1248 I_SYMBOL_BINDING (b
->id
) = b
->shadowed
;
1249 if (b
->shadowed
&& b
->shadowed
->u
.type
)
1250 TREE_TYPE (b
->shadowed
->decl
) = b
->shadowed
->u
.type
;
1260 /* Dispose of the block that we just made inside some higher level. */
1261 if ((scope
->function_body
|| scope
== file_scope
) && context
)
1263 DECL_INITIAL (context
) = block
;
1264 BLOCK_SUPERCONTEXT (block
) = context
;
1266 else if (scope
->outer
)
1269 SCOPE_LIST_APPEND (scope
->outer
, blocks
, block
);
1270 /* If we did not make a block for the scope just exited, any
1271 blocks made for inner scopes must be carried forward so they
1272 will later become subblocks of something else. */
1273 else if (scope
->blocks
)
1274 SCOPE_LIST_CONCAT (scope
->outer
, blocks
, scope
, blocks
);
1277 /* Pop the current scope, and free the structure for reuse. */
1278 current_scope
= scope
->outer
;
1279 if (scope
->function_body
)
1280 current_function_scope
= scope
->outer_function
;
1282 memset (scope
, 0, sizeof (struct c_scope
));
1283 scope
->outer
= scope_freelist
;
1284 scope_freelist
= scope
;
1290 push_file_scope (void)
1298 file_scope
= current_scope
;
1300 start_fname_decls ();
1302 for (decl
= visible_builtins
; decl
; decl
= DECL_CHAIN (decl
))
1303 bind (DECL_NAME (decl
), decl
, file_scope
,
1304 /*invisible=*/false, /*nested=*/true, DECL_SOURCE_LOCATION (decl
));
1308 pop_file_scope (void)
1310 /* In case there were missing closebraces, get us back to the global
1312 while (current_scope
!= file_scope
)
1315 /* __FUNCTION__ is defined at file scope (""). This
1316 call may not be necessary as my tests indicate it
1317 still works without it. */
1318 finish_fname_decls ();
1320 check_inline_statics ();
1322 /* This is the point to write out a PCH if we're doing that.
1323 In that case we do not want to do anything else. */
1326 c_common_write_pch ();
1330 /* Pop off the file scope and close this translation unit. */
1334 maybe_apply_pending_pragma_weaks ();
1337 /* Adjust the bindings for the start of a statement expression. */
1340 c_bindings_start_stmt_expr (struct c_spot_bindings
* switch_bindings
)
1342 struct c_scope
*scope
;
1344 for (scope
= current_scope
; scope
!= NULL
; scope
= scope
->outer
)
1346 struct c_binding
*b
;
1348 if (!scope
->has_label_bindings
)
1351 for (b
= scope
->bindings
; b
!= NULL
; b
= b
->prev
)
1353 struct c_label_vars
*label_vars
;
1355 struct c_goto_bindings
*g
;
1357 if (TREE_CODE (b
->decl
) != LABEL_DECL
)
1359 label_vars
= b
->u
.label
;
1360 ++label_vars
->label_bindings
.stmt_exprs
;
1361 FOR_EACH_VEC_ELT (c_goto_bindings_p
, label_vars
->gotos
, ix
, g
)
1362 ++g
->goto_bindings
.stmt_exprs
;
1366 if (switch_bindings
!= NULL
)
1367 ++switch_bindings
->stmt_exprs
;
1370 /* Adjust the bindings for the end of a statement expression. */
1373 c_bindings_end_stmt_expr (struct c_spot_bindings
*switch_bindings
)
1375 struct c_scope
*scope
;
1377 for (scope
= current_scope
; scope
!= NULL
; scope
= scope
->outer
)
1379 struct c_binding
*b
;
1381 if (!scope
->has_label_bindings
)
1384 for (b
= scope
->bindings
; b
!= NULL
; b
= b
->prev
)
1386 struct c_label_vars
*label_vars
;
1388 struct c_goto_bindings
*g
;
1390 if (TREE_CODE (b
->decl
) != LABEL_DECL
)
1392 label_vars
= b
->u
.label
;
1393 --label_vars
->label_bindings
.stmt_exprs
;
1394 if (label_vars
->label_bindings
.stmt_exprs
< 0)
1396 label_vars
->label_bindings
.left_stmt_expr
= true;
1397 label_vars
->label_bindings
.stmt_exprs
= 0;
1399 FOR_EACH_VEC_ELT (c_goto_bindings_p
, label_vars
->gotos
, ix
, g
)
1401 --g
->goto_bindings
.stmt_exprs
;
1402 if (g
->goto_bindings
.stmt_exprs
< 0)
1404 g
->goto_bindings
.left_stmt_expr
= true;
1405 g
->goto_bindings
.stmt_exprs
= 0;
1411 if (switch_bindings
!= NULL
)
1413 --switch_bindings
->stmt_exprs
;
1414 gcc_assert (switch_bindings
->stmt_exprs
>= 0);
1418 /* Push a definition or a declaration of struct, union or enum tag "name".
1419 "type" should be the type node.
1420 We assume that the tag "name" is not already defined, and has a location
1423 Note that the definition may really be just a forward reference.
1424 In that case, the TYPE_SIZE will be zero. */
1427 pushtag (location_t loc
, tree name
, tree type
)
1429 /* Record the identifier as the type's name if it has none. */
1430 if (name
&& !TYPE_NAME (type
))
1431 TYPE_NAME (type
) = name
;
1432 bind (name
, type
, current_scope
, /*invisible=*/false, /*nested=*/false, loc
);
1434 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1435 tagged type we just added to the current scope. This fake
1436 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1437 to output a representation of a tagged type, and it also gives
1438 us a convenient place to record the "scope start" address for the
1441 TYPE_STUB_DECL (type
) = pushdecl (build_decl (loc
,
1442 TYPE_DECL
, NULL_TREE
, type
));
1444 /* An approximation for now, so we can tell this is a function-scope tag.
1445 This will be updated in pop_scope. */
1446 TYPE_CONTEXT (type
) = DECL_CONTEXT (TYPE_STUB_DECL (type
));
1448 if (warn_cxx_compat
&& name
!= NULL_TREE
)
1450 struct c_binding
*b
= I_SYMBOL_BINDING (name
);
1453 && b
->decl
!= NULL_TREE
1454 && TREE_CODE (b
->decl
) == TYPE_DECL
1455 && (B_IN_CURRENT_SCOPE (b
)
1456 || (current_scope
== file_scope
&& B_IN_EXTERNAL_SCOPE (b
)))
1457 && (TYPE_MAIN_VARIANT (TREE_TYPE (b
->decl
))
1458 != TYPE_MAIN_VARIANT (type
)))
1460 warning_at (loc
, OPT_Wc___compat
,
1461 ("using %qD as both a typedef and a tag is "
1464 if (b
->locus
!= UNKNOWN_LOCATION
)
1465 inform (b
->locus
, "originally defined here");
1470 /* Subroutine of compare_decls. Allow harmless mismatches in return
1471 and argument types provided that the type modes match. This function
1472 return a unified type given a suitable match, and 0 otherwise. */
1475 match_builtin_function_types (tree newtype
, tree oldtype
)
1477 tree newrettype
, oldrettype
;
1478 tree newargs
, oldargs
;
1479 tree trytype
, tryargs
;
1481 /* Accept the return type of the new declaration if same modes. */
1482 oldrettype
= TREE_TYPE (oldtype
);
1483 newrettype
= TREE_TYPE (newtype
);
1485 if (TYPE_MODE (oldrettype
) != TYPE_MODE (newrettype
))
1488 oldargs
= TYPE_ARG_TYPES (oldtype
);
1489 newargs
= TYPE_ARG_TYPES (newtype
);
1492 while (oldargs
|| newargs
)
1496 || !TREE_VALUE (oldargs
)
1497 || !TREE_VALUE (newargs
)
1498 || TYPE_MODE (TREE_VALUE (oldargs
))
1499 != TYPE_MODE (TREE_VALUE (newargs
)))
1502 oldargs
= TREE_CHAIN (oldargs
);
1503 newargs
= TREE_CHAIN (newargs
);
1506 trytype
= build_function_type (newrettype
, tryargs
);
1507 return build_type_attribute_variant (trytype
, TYPE_ATTRIBUTES (oldtype
));
1510 /* Subroutine of diagnose_mismatched_decls. Check for function type
1511 mismatch involving an empty arglist vs a nonempty one and give clearer
1514 diagnose_arglist_conflict (tree newdecl
, tree olddecl
,
1515 tree newtype
, tree oldtype
)
1519 if (TREE_CODE (olddecl
) != FUNCTION_DECL
1520 || !comptypes (TREE_TYPE (oldtype
), TREE_TYPE (newtype
))
1521 || !((!prototype_p (oldtype
) && DECL_INITIAL (olddecl
) == 0)
1522 || (!prototype_p (newtype
) && DECL_INITIAL (newdecl
) == 0)))
1525 t
= TYPE_ARG_TYPES (oldtype
);
1527 t
= TYPE_ARG_TYPES (newtype
);
1528 for (; t
; t
= TREE_CHAIN (t
))
1530 tree type
= TREE_VALUE (t
);
1532 if (TREE_CHAIN (t
) == 0
1533 && TYPE_MAIN_VARIANT (type
) != void_type_node
)
1535 inform (input_location
, "a parameter list with an ellipsis can%'t match "
1536 "an empty parameter name list declaration");
1540 if (c_type_promotes_to (type
) != type
)
1542 inform (input_location
, "an argument type that has a default promotion can%'t match "
1543 "an empty parameter name list declaration");
1549 /* Another subroutine of diagnose_mismatched_decls. OLDDECL is an
1550 old-style function definition, NEWDECL is a prototype declaration.
1551 Diagnose inconsistencies in the argument list. Returns TRUE if
1552 the prototype is compatible, FALSE if not. */
1554 validate_proto_after_old_defn (tree newdecl
, tree newtype
, tree oldtype
)
1556 tree newargs
, oldargs
;
1559 #define END_OF_ARGLIST(t) ((t) == void_type_node)
1561 oldargs
= TYPE_ACTUAL_ARG_TYPES (oldtype
);
1562 newargs
= TYPE_ARG_TYPES (newtype
);
1567 tree oldargtype
= TREE_VALUE (oldargs
);
1568 tree newargtype
= TREE_VALUE (newargs
);
1570 if (oldargtype
== error_mark_node
|| newargtype
== error_mark_node
)
1573 oldargtype
= TYPE_MAIN_VARIANT (oldargtype
);
1574 newargtype
= TYPE_MAIN_VARIANT (newargtype
);
1576 if (END_OF_ARGLIST (oldargtype
) && END_OF_ARGLIST (newargtype
))
1579 /* Reaching the end of just one list means the two decls don't
1580 agree on the number of arguments. */
1581 if (END_OF_ARGLIST (oldargtype
))
1583 error ("prototype for %q+D declares more arguments "
1584 "than previous old-style definition", newdecl
);
1587 else if (END_OF_ARGLIST (newargtype
))
1589 error ("prototype for %q+D declares fewer arguments "
1590 "than previous old-style definition", newdecl
);
1594 /* Type for passing arg must be consistent with that declared
1596 else if (!comptypes (oldargtype
, newargtype
))
1598 error ("prototype for %q+D declares argument %d"
1599 " with incompatible type",
1604 oldargs
= TREE_CHAIN (oldargs
);
1605 newargs
= TREE_CHAIN (newargs
);
1609 /* If we get here, no errors were found, but do issue a warning
1610 for this poor-style construct. */
1611 warning (0, "prototype for %q+D follows non-prototype definition",
1614 #undef END_OF_ARGLIST
1617 /* Subroutine of diagnose_mismatched_decls. Report the location of DECL,
1618 first in a pair of mismatched declarations, using the diagnostic
1621 locate_old_decl (tree decl
)
1623 if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_BUILT_IN (decl
))
1625 else if (DECL_INITIAL (decl
))
1626 inform (input_location
, "previous definition of %q+D was here", decl
);
1627 else if (C_DECL_IMPLICIT (decl
))
1628 inform (input_location
, "previous implicit declaration of %q+D was here", decl
);
1630 inform (input_location
, "previous declaration of %q+D was here", decl
);
1633 /* Subroutine of duplicate_decls. Compare NEWDECL to OLDDECL.
1634 Returns true if the caller should proceed to merge the two, false
1635 if OLDDECL should simply be discarded. As a side effect, issues
1636 all necessary diagnostics for invalid or poor-style combinations.
1637 If it returns true, writes the types of NEWDECL and OLDDECL to
1638 *NEWTYPEP and *OLDTYPEP - these may have been adjusted from
1639 TREE_TYPE (NEWDECL, OLDDECL) respectively. */
1642 diagnose_mismatched_decls (tree newdecl
, tree olddecl
,
1643 tree
*newtypep
, tree
*oldtypep
)
1645 tree newtype
, oldtype
;
1646 bool pedwarned
= false;
1647 bool warned
= false;
1650 #define DECL_EXTERN_INLINE(DECL) (DECL_DECLARED_INLINE_P (DECL) \
1651 && DECL_EXTERNAL (DECL))
1653 /* If we have error_mark_node for either decl or type, just discard
1654 the previous decl - we're in an error cascade already. */
1655 if (olddecl
== error_mark_node
|| newdecl
== error_mark_node
)
1657 *oldtypep
= oldtype
= TREE_TYPE (olddecl
);
1658 *newtypep
= newtype
= TREE_TYPE (newdecl
);
1659 if (oldtype
== error_mark_node
|| newtype
== error_mark_node
)
1662 /* Two different categories of symbol altogether. This is an error
1663 unless OLDDECL is a builtin. OLDDECL will be discarded in any case. */
1664 if (TREE_CODE (olddecl
) != TREE_CODE (newdecl
))
1666 if (!(TREE_CODE (olddecl
) == FUNCTION_DECL
1667 && DECL_BUILT_IN (olddecl
)
1668 && !C_DECL_DECLARED_BUILTIN (olddecl
)))
1670 error ("%q+D redeclared as different kind of symbol", newdecl
);
1671 locate_old_decl (olddecl
);
1673 else if (TREE_PUBLIC (newdecl
))
1674 warning (0, "built-in function %q+D declared as non-function",
1677 warning (OPT_Wshadow
, "declaration of %q+D shadows "
1678 "a built-in function", newdecl
);
1682 /* Enumerators have no linkage, so may only be declared once in a
1684 if (TREE_CODE (olddecl
) == CONST_DECL
)
1686 error ("redeclaration of enumerator %q+D", newdecl
);
1687 locate_old_decl (olddecl
);
1691 if (!comptypes (oldtype
, newtype
))
1693 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1694 && DECL_BUILT_IN (olddecl
) && !C_DECL_DECLARED_BUILTIN (olddecl
))
1696 /* Accept harmless mismatch in function types.
1697 This is for the ffs and fprintf builtins. */
1698 tree trytype
= match_builtin_function_types (newtype
, oldtype
);
1700 if (trytype
&& comptypes (newtype
, trytype
))
1701 *oldtypep
= oldtype
= trytype
;
1704 /* If types don't match for a built-in, throw away the
1705 built-in. No point in calling locate_old_decl here, it
1706 won't print anything. */
1707 warning (0, "conflicting types for built-in function %q+D",
1712 else if (TREE_CODE (olddecl
) == FUNCTION_DECL
1713 && DECL_IS_BUILTIN (olddecl
))
1715 /* A conflicting function declaration for a predeclared
1716 function that isn't actually built in. Objective C uses
1717 these. The new declaration silently overrides everything
1718 but the volatility (i.e. noreturn) indication. See also
1719 below. FIXME: Make Objective C use normal builtins. */
1720 TREE_THIS_VOLATILE (newdecl
) |= TREE_THIS_VOLATILE (olddecl
);
1723 /* Permit void foo (...) to match int foo (...) if the latter is
1724 the definition and implicit int was used. See
1725 c-torture/compile/920625-2.c. */
1726 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
&& DECL_INITIAL (newdecl
)
1727 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype
)) == void_type_node
1728 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype
)) == integer_type_node
1729 && C_FUNCTION_IMPLICIT_INT (newdecl
) && !DECL_INITIAL (olddecl
))
1731 pedwarned
= pedwarn (input_location
, 0,
1732 "conflicting types for %q+D", newdecl
);
1733 /* Make sure we keep void as the return type. */
1734 TREE_TYPE (newdecl
) = *newtypep
= newtype
= oldtype
;
1735 C_FUNCTION_IMPLICIT_INT (newdecl
) = 0;
1737 /* Permit void foo (...) to match an earlier call to foo (...) with
1738 no declared type (thus, implicitly int). */
1739 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
1740 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype
)) == void_type_node
1741 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype
)) == integer_type_node
1742 && C_DECL_IMPLICIT (olddecl
) && !DECL_INITIAL (olddecl
))
1744 pedwarned
= pedwarn (input_location
, 0,
1745 "conflicting types for %q+D", newdecl
);
1746 /* Make sure we keep void as the return type. */
1747 TREE_TYPE (olddecl
) = *oldtypep
= oldtype
= newtype
;
1751 int new_quals
= TYPE_QUALS (newtype
);
1752 int old_quals
= TYPE_QUALS (oldtype
);
1754 if (new_quals
!= old_quals
)
1756 addr_space_t new_addr
= DECODE_QUAL_ADDR_SPACE (new_quals
);
1757 addr_space_t old_addr
= DECODE_QUAL_ADDR_SPACE (old_quals
);
1758 if (new_addr
!= old_addr
)
1760 if (ADDR_SPACE_GENERIC_P (new_addr
))
1761 error ("conflicting named address spaces (generic vs %s) "
1763 c_addr_space_name (old_addr
), newdecl
);
1764 else if (ADDR_SPACE_GENERIC_P (old_addr
))
1765 error ("conflicting named address spaces (%s vs generic) "
1767 c_addr_space_name (new_addr
), newdecl
);
1769 error ("conflicting named address spaces (%s vs %s) "
1771 c_addr_space_name (new_addr
),
1772 c_addr_space_name (old_addr
),
1776 if (CLEAR_QUAL_ADDR_SPACE (new_quals
)
1777 != CLEAR_QUAL_ADDR_SPACE (old_quals
))
1778 error ("conflicting type qualifiers for %q+D", newdecl
);
1781 error ("conflicting types for %q+D", newdecl
);
1782 diagnose_arglist_conflict (newdecl
, olddecl
, newtype
, oldtype
);
1783 locate_old_decl (olddecl
);
1788 /* Redeclaration of a type is a constraint violation (6.7.2.3p1),
1789 but silently ignore the redeclaration if either is in a system
1790 header. (Conflicting redeclarations were handled above.) This
1791 is allowed for C1X if the types are the same, not just
1793 if (TREE_CODE (newdecl
) == TYPE_DECL
)
1795 bool types_different
= false;
1796 int comptypes_result
;
1799 = comptypes_check_different_types (oldtype
, newtype
, &types_different
);
1801 if (comptypes_result
!= 1 || types_different
)
1803 error ("redefinition of typedef %q+D with different type", newdecl
);
1804 locate_old_decl (olddecl
);
1808 if (DECL_IN_SYSTEM_HEADER (newdecl
)
1809 || DECL_IN_SYSTEM_HEADER (olddecl
)
1810 || TREE_NO_WARNING (newdecl
)
1811 || TREE_NO_WARNING (olddecl
))
1812 return true; /* Allow OLDDECL to continue in use. */
1814 if (variably_modified_type_p (newtype
, NULL
))
1816 error ("redefinition of typedef %q+D with variably modified type",
1818 locate_old_decl (olddecl
);
1820 else if (pedantic
&& !flag_isoc1x
)
1822 pedwarn (input_location
, OPT_pedantic
,
1823 "redefinition of typedef %q+D", newdecl
);
1824 locate_old_decl (olddecl
);
1830 /* Function declarations can either be 'static' or 'extern' (no
1831 qualifier is equivalent to 'extern' - C99 6.2.2p5) and therefore
1832 can never conflict with each other on account of linkage
1833 (6.2.2p4). Multiple definitions are not allowed (6.9p3,5) but
1834 gnu89 mode permits two definitions if one is 'extern inline' and
1835 one is not. The non- extern-inline definition supersedes the
1836 extern-inline definition. */
1838 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1840 /* If you declare a built-in function name as static, or
1841 define the built-in with an old-style definition (so we
1842 can't validate the argument list) the built-in definition is
1843 overridden, but optionally warn this was a bad choice of name. */
1844 if (DECL_BUILT_IN (olddecl
)
1845 && !C_DECL_DECLARED_BUILTIN (olddecl
)
1846 && (!TREE_PUBLIC (newdecl
)
1847 || (DECL_INITIAL (newdecl
)
1848 && !prototype_p (TREE_TYPE (newdecl
)))))
1850 warning (OPT_Wshadow
, "declaration of %q+D shadows "
1851 "a built-in function", newdecl
);
1852 /* Discard the old built-in function. */
1856 if (DECL_INITIAL (newdecl
))
1858 if (DECL_INITIAL (olddecl
))
1860 /* If both decls are in the same TU and the new declaration
1861 isn't overriding an extern inline reject the new decl.
1862 In c99, no overriding is allowed in the same translation
1864 if ((!DECL_EXTERN_INLINE (olddecl
)
1865 || DECL_EXTERN_INLINE (newdecl
)
1866 || (!flag_gnu89_inline
1867 && (!DECL_DECLARED_INLINE_P (olddecl
)
1868 || !lookup_attribute ("gnu_inline",
1869 DECL_ATTRIBUTES (olddecl
)))
1870 && (!DECL_DECLARED_INLINE_P (newdecl
)
1871 || !lookup_attribute ("gnu_inline",
1872 DECL_ATTRIBUTES (newdecl
))))
1874 && same_translation_unit_p (newdecl
, olddecl
))
1876 error ("redefinition of %q+D", newdecl
);
1877 locate_old_decl (olddecl
);
1882 /* If we have a prototype after an old-style function definition,
1883 the argument types must be checked specially. */
1884 else if (DECL_INITIAL (olddecl
)
1885 && !prototype_p (oldtype
) && prototype_p (newtype
)
1886 && TYPE_ACTUAL_ARG_TYPES (oldtype
)
1887 && !validate_proto_after_old_defn (newdecl
, newtype
, oldtype
))
1889 locate_old_decl (olddecl
);
1892 /* A non-static declaration (even an "extern") followed by a
1893 static declaration is undefined behavior per C99 6.2.2p3-5,7.
1894 The same is true for a static forward declaration at block
1895 scope followed by a non-static declaration/definition at file
1896 scope. Static followed by non-static at the same scope is
1897 not undefined behavior, and is the most convenient way to get
1898 some effects (see e.g. what unwind-dw2-fde-glibc.c does to
1899 the definition of _Unwind_Find_FDE in unwind-dw2-fde.c), but
1900 we do diagnose it if -Wtraditional. */
1901 if (TREE_PUBLIC (olddecl
) && !TREE_PUBLIC (newdecl
))
1903 /* Two exceptions to the rule. If olddecl is an extern
1904 inline, or a predeclared function that isn't actually
1905 built in, newdecl silently overrides olddecl. The latter
1906 occur only in Objective C; see also above. (FIXME: Make
1907 Objective C use normal builtins.) */
1908 if (!DECL_IS_BUILTIN (olddecl
)
1909 && !DECL_EXTERN_INLINE (olddecl
))
1911 error ("static declaration of %q+D follows "
1912 "non-static declaration", newdecl
);
1913 locate_old_decl (olddecl
);
1917 else if (TREE_PUBLIC (newdecl
) && !TREE_PUBLIC (olddecl
))
1919 if (DECL_CONTEXT (olddecl
))
1921 error ("non-static declaration of %q+D follows "
1922 "static declaration", newdecl
);
1923 locate_old_decl (olddecl
);
1926 else if (warn_traditional
)
1928 warned
|= warning (OPT_Wtraditional
,
1929 "non-static declaration of %q+D "
1930 "follows static declaration", newdecl
);
1934 /* Make sure gnu_inline attribute is either not present, or
1935 present on all inline decls. */
1936 if (DECL_DECLARED_INLINE_P (olddecl
)
1937 && DECL_DECLARED_INLINE_P (newdecl
))
1939 bool newa
= lookup_attribute ("gnu_inline",
1940 DECL_ATTRIBUTES (newdecl
)) != NULL
;
1941 bool olda
= lookup_attribute ("gnu_inline",
1942 DECL_ATTRIBUTES (olddecl
)) != NULL
;
1945 error_at (input_location
, "%<gnu_inline%> attribute present on %q+D",
1946 newa
? newdecl
: olddecl
);
1947 error_at (DECL_SOURCE_LOCATION (newa
? olddecl
: newdecl
),
1952 else if (TREE_CODE (newdecl
) == VAR_DECL
)
1954 /* Only variables can be thread-local, and all declarations must
1955 agree on this property. */
1956 if (C_DECL_THREADPRIVATE_P (olddecl
) && !DECL_THREAD_LOCAL_P (newdecl
))
1958 /* Nothing to check. Since OLDDECL is marked threadprivate
1959 and NEWDECL does not have a thread-local attribute, we
1960 will merge the threadprivate attribute into NEWDECL. */
1963 else if (DECL_THREAD_LOCAL_P (newdecl
) != DECL_THREAD_LOCAL_P (olddecl
))
1965 if (DECL_THREAD_LOCAL_P (newdecl
))
1966 error ("thread-local declaration of %q+D follows "
1967 "non-thread-local declaration", newdecl
);
1969 error ("non-thread-local declaration of %q+D follows "
1970 "thread-local declaration", newdecl
);
1972 locate_old_decl (olddecl
);
1976 /* Multiple initialized definitions are not allowed (6.9p3,5). */
1977 if (DECL_INITIAL (newdecl
) && DECL_INITIAL (olddecl
))
1979 error ("redefinition of %q+D", newdecl
);
1980 locate_old_decl (olddecl
);
1984 /* Objects declared at file scope: if the first declaration had
1985 external linkage (even if it was an external reference) the
1986 second must have external linkage as well, or the behavior is
1987 undefined. If the first declaration had internal linkage, then
1988 the second must too, or else be an external reference (in which
1989 case the composite declaration still has internal linkage).
1990 As for function declarations, we warn about the static-then-
1991 extern case only for -Wtraditional. See generally 6.2.2p3-5,7. */
1992 if (DECL_FILE_SCOPE_P (newdecl
)
1993 && TREE_PUBLIC (newdecl
) != TREE_PUBLIC (olddecl
))
1995 if (DECL_EXTERNAL (newdecl
))
1997 if (!DECL_FILE_SCOPE_P (olddecl
))
1999 error ("extern declaration of %q+D follows "
2000 "declaration with no linkage", newdecl
);
2001 locate_old_decl (olddecl
);
2004 else if (warn_traditional
)
2006 warned
|= warning (OPT_Wtraditional
,
2007 "non-static declaration of %q+D "
2008 "follows static declaration", newdecl
);
2013 if (TREE_PUBLIC (newdecl
))
2014 error ("non-static declaration of %q+D follows "
2015 "static declaration", newdecl
);
2017 error ("static declaration of %q+D follows "
2018 "non-static declaration", newdecl
);
2020 locate_old_decl (olddecl
);
2024 /* Two objects with the same name declared at the same block
2025 scope must both be external references (6.7p3). */
2026 else if (!DECL_FILE_SCOPE_P (newdecl
))
2028 if (DECL_EXTERNAL (newdecl
))
2030 /* Extern with initializer at block scope, which will
2031 already have received an error. */
2033 else if (DECL_EXTERNAL (olddecl
))
2035 error ("declaration of %q+D with no linkage follows "
2036 "extern declaration", newdecl
);
2037 locate_old_decl (olddecl
);
2041 error ("redeclaration of %q+D with no linkage", newdecl
);
2042 locate_old_decl (olddecl
);
2048 /* C++ does not permit a decl to appear multiple times at file
2051 && DECL_FILE_SCOPE_P (newdecl
)
2052 && !DECL_EXTERNAL (newdecl
)
2053 && !DECL_EXTERNAL (olddecl
))
2054 warned
|= warning_at (DECL_SOURCE_LOCATION (newdecl
),
2056 ("duplicate declaration of %qD is "
2062 /* All decls must agree on a visibility. */
2063 if (CODE_CONTAINS_STRUCT (TREE_CODE (newdecl
), TS_DECL_WITH_VIS
)
2064 && DECL_VISIBILITY_SPECIFIED (newdecl
) && DECL_VISIBILITY_SPECIFIED (olddecl
)
2065 && DECL_VISIBILITY (newdecl
) != DECL_VISIBILITY (olddecl
))
2067 warned
|= warning (0, "redeclaration of %q+D with different visibility "
2068 "(old visibility preserved)", newdecl
);
2071 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2073 /* Diagnose inline __attribute__ ((noinline)) which is silly. */
2074 if (DECL_DECLARED_INLINE_P (newdecl
)
2075 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl
)))
2077 warned
|= warning (OPT_Wattributes
,
2078 "inline declaration of %qD follows "
2079 "declaration with attribute noinline", newdecl
);
2081 else if (DECL_DECLARED_INLINE_P (olddecl
)
2082 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl
)))
2084 warned
|= warning (OPT_Wattributes
,
2085 "declaration of %q+D with attribute "
2086 "noinline follows inline declaration ", newdecl
);
2089 else /* PARM_DECL, VAR_DECL */
2091 /* Redeclaration of a parameter is a constraint violation (this is
2092 not explicitly stated, but follows from C99 6.7p3 [no more than
2093 one declaration of the same identifier with no linkage in the
2094 same scope, except type tags] and 6.2.2p6 [parameters have no
2095 linkage]). We must check for a forward parameter declaration,
2096 indicated by TREE_ASM_WRITTEN on the old declaration - this is
2097 an extension, the mandatory diagnostic for which is handled by
2098 mark_forward_parm_decls. */
2100 if (TREE_CODE (newdecl
) == PARM_DECL
2101 && (!TREE_ASM_WRITTEN (olddecl
) || TREE_ASM_WRITTEN (newdecl
)))
2103 error ("redefinition of parameter %q+D", newdecl
);
2104 locate_old_decl (olddecl
);
2109 /* Optional warning for completely redundant decls. */
2110 if (!warned
&& !pedwarned
2111 && warn_redundant_decls
2112 /* Don't warn about a function declaration followed by a
2114 && !(TREE_CODE (newdecl
) == FUNCTION_DECL
2115 && DECL_INITIAL (newdecl
) && !DECL_INITIAL (olddecl
))
2116 /* Don't warn about redundant redeclarations of builtins. */
2117 && !(TREE_CODE (newdecl
) == FUNCTION_DECL
2118 && !DECL_BUILT_IN (newdecl
)
2119 && DECL_BUILT_IN (olddecl
)
2120 && !C_DECL_DECLARED_BUILTIN (olddecl
))
2121 /* Don't warn about an extern followed by a definition. */
2122 && !(DECL_EXTERNAL (olddecl
) && !DECL_EXTERNAL (newdecl
))
2123 /* Don't warn about forward parameter decls. */
2124 && !(TREE_CODE (newdecl
) == PARM_DECL
2125 && TREE_ASM_WRITTEN (olddecl
) && !TREE_ASM_WRITTEN (newdecl
))
2126 /* Don't warn about a variable definition following a declaration. */
2127 && !(TREE_CODE (newdecl
) == VAR_DECL
2128 && DECL_INITIAL (newdecl
) && !DECL_INITIAL (olddecl
)))
2130 warned
= warning (OPT_Wredundant_decls
, "redundant redeclaration of %q+D",
2134 /* Report location of previous decl/defn. */
2135 if (warned
|| pedwarned
)
2136 locate_old_decl (olddecl
);
2138 #undef DECL_EXTERN_INLINE
2143 /* Subroutine of duplicate_decls. NEWDECL has been found to be
2144 consistent with OLDDECL, but carries new information. Merge the
2145 new information into OLDDECL. This function issues no
2149 merge_decls (tree newdecl
, tree olddecl
, tree newtype
, tree oldtype
)
2151 bool new_is_definition
= (TREE_CODE (newdecl
) == FUNCTION_DECL
2152 && DECL_INITIAL (newdecl
) != 0);
2153 bool new_is_prototype
= (TREE_CODE (newdecl
) == FUNCTION_DECL
2154 && prototype_p (TREE_TYPE (newdecl
)));
2155 bool old_is_prototype
= (TREE_CODE (olddecl
) == FUNCTION_DECL
2156 && prototype_p (TREE_TYPE (olddecl
)));
2157 bool extern_changed
= false;
2159 /* For real parm decl following a forward decl, rechain the old decl
2160 in its new location and clear TREE_ASM_WRITTEN (it's not a
2161 forward decl anymore). */
2162 if (TREE_CODE (newdecl
) == PARM_DECL
2163 && TREE_ASM_WRITTEN (olddecl
) && !TREE_ASM_WRITTEN (newdecl
))
2165 struct c_binding
*b
, **here
;
2167 for (here
= ¤t_scope
->bindings
; *here
; here
= &(*here
)->prev
)
2168 if ((*here
)->decl
== olddecl
)
2175 b
->prev
= current_scope
->bindings
;
2176 current_scope
->bindings
= b
;
2178 TREE_ASM_WRITTEN (olddecl
) = 0;
2181 DECL_ATTRIBUTES (newdecl
)
2182 = targetm
.merge_decl_attributes (olddecl
, newdecl
);
2184 /* Merge the data types specified in the two decls. */
2186 = TREE_TYPE (olddecl
)
2187 = composite_type (newtype
, oldtype
);
2189 /* Lay the type out, unless already done. */
2190 if (!comptypes (oldtype
, TREE_TYPE (newdecl
)))
2192 if (TREE_TYPE (newdecl
) != error_mark_node
)
2193 layout_type (TREE_TYPE (newdecl
));
2194 if (TREE_CODE (newdecl
) != FUNCTION_DECL
2195 && TREE_CODE (newdecl
) != TYPE_DECL
2196 && TREE_CODE (newdecl
) != CONST_DECL
)
2197 layout_decl (newdecl
, 0);
2201 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
2202 DECL_SIZE (newdecl
) = DECL_SIZE (olddecl
);
2203 DECL_SIZE_UNIT (newdecl
) = DECL_SIZE_UNIT (olddecl
);
2204 DECL_MODE (newdecl
) = DECL_MODE (olddecl
);
2205 if (DECL_ALIGN (olddecl
) > DECL_ALIGN (newdecl
))
2207 DECL_ALIGN (newdecl
) = DECL_ALIGN (olddecl
);
2208 DECL_USER_ALIGN (newdecl
) |= DECL_USER_ALIGN (olddecl
);
2212 /* Keep the old rtl since we can safely use it. */
2213 if (HAS_RTL_P (olddecl
))
2214 COPY_DECL_RTL (olddecl
, newdecl
);
2216 /* Merge the type qualifiers. */
2217 if (TREE_READONLY (newdecl
))
2218 TREE_READONLY (olddecl
) = 1;
2220 if (TREE_THIS_VOLATILE (newdecl
))
2221 TREE_THIS_VOLATILE (olddecl
) = 1;
2223 /* Merge deprecatedness. */
2224 if (TREE_DEPRECATED (newdecl
))
2225 TREE_DEPRECATED (olddecl
) = 1;
2227 /* If a decl is in a system header and the other isn't, keep the one on the
2228 system header. Otherwise, keep source location of definition rather than
2229 declaration and of prototype rather than non-prototype unless that
2230 prototype is built-in. */
2231 if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl
), TS_DECL_WITH_VIS
)
2232 && DECL_IN_SYSTEM_HEADER (olddecl
)
2233 && !DECL_IN_SYSTEM_HEADER (newdecl
) )
2234 DECL_SOURCE_LOCATION (newdecl
) = DECL_SOURCE_LOCATION (olddecl
);
2235 else if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl
), TS_DECL_WITH_VIS
)
2236 && DECL_IN_SYSTEM_HEADER (newdecl
)
2237 && !DECL_IN_SYSTEM_HEADER (olddecl
))
2238 DECL_SOURCE_LOCATION (olddecl
) = DECL_SOURCE_LOCATION (newdecl
);
2239 else if ((DECL_INITIAL (newdecl
) == 0 && DECL_INITIAL (olddecl
) != 0)
2240 || (old_is_prototype
&& !new_is_prototype
2241 && !C_DECL_BUILTIN_PROTOTYPE (olddecl
)))
2242 DECL_SOURCE_LOCATION (newdecl
) = DECL_SOURCE_LOCATION (olddecl
);
2244 /* Merge the initialization information. */
2245 if (DECL_INITIAL (newdecl
) == 0)
2246 DECL_INITIAL (newdecl
) = DECL_INITIAL (olddecl
);
2248 /* Merge the threadprivate attribute. */
2249 if (TREE_CODE (olddecl
) == VAR_DECL
&& C_DECL_THREADPRIVATE_P (olddecl
))
2251 DECL_TLS_MODEL (newdecl
) = DECL_TLS_MODEL (olddecl
);
2252 C_DECL_THREADPRIVATE_P (newdecl
) = 1;
2255 if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl
), TS_DECL_WITH_VIS
))
2257 /* Merge the section attribute.
2258 We want to issue an error if the sections conflict but that
2259 must be done later in decl_attributes since we are called
2260 before attributes are assigned. */
2261 if (DECL_SECTION_NAME (newdecl
) == NULL_TREE
)
2262 DECL_SECTION_NAME (newdecl
) = DECL_SECTION_NAME (olddecl
);
2264 /* Copy the assembler name.
2265 Currently, it can only be defined in the prototype. */
2266 COPY_DECL_ASSEMBLER_NAME (olddecl
, newdecl
);
2268 /* Use visibility of whichever declaration had it specified */
2269 if (DECL_VISIBILITY_SPECIFIED (olddecl
))
2271 DECL_VISIBILITY (newdecl
) = DECL_VISIBILITY (olddecl
);
2272 DECL_VISIBILITY_SPECIFIED (newdecl
) = 1;
2275 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2277 DECL_STATIC_CONSTRUCTOR(newdecl
) |= DECL_STATIC_CONSTRUCTOR(olddecl
);
2278 DECL_STATIC_DESTRUCTOR (newdecl
) |= DECL_STATIC_DESTRUCTOR (olddecl
);
2279 DECL_NO_LIMIT_STACK (newdecl
) |= DECL_NO_LIMIT_STACK (olddecl
);
2280 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl
)
2281 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl
);
2282 TREE_THIS_VOLATILE (newdecl
) |= TREE_THIS_VOLATILE (olddecl
);
2283 DECL_IS_MALLOC (newdecl
) |= DECL_IS_MALLOC (olddecl
);
2284 DECL_IS_OPERATOR_NEW (newdecl
) |= DECL_IS_OPERATOR_NEW (olddecl
);
2285 TREE_READONLY (newdecl
) |= TREE_READONLY (olddecl
);
2286 DECL_PURE_P (newdecl
) |= DECL_PURE_P (olddecl
);
2287 DECL_IS_NOVOPS (newdecl
) |= DECL_IS_NOVOPS (olddecl
);
2290 /* Merge the storage class information. */
2291 merge_weak (newdecl
, olddecl
);
2293 /* For functions, static overrides non-static. */
2294 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2296 TREE_PUBLIC (newdecl
) &= TREE_PUBLIC (olddecl
);
2297 /* This is since we don't automatically
2298 copy the attributes of NEWDECL into OLDDECL. */
2299 TREE_PUBLIC (olddecl
) = TREE_PUBLIC (newdecl
);
2300 /* If this clears `static', clear it in the identifier too. */
2301 if (!TREE_PUBLIC (olddecl
))
2302 TREE_PUBLIC (DECL_NAME (olddecl
)) = 0;
2306 /* In c99, 'extern' declaration before (or after) 'inline' means this
2307 function is not DECL_EXTERNAL, unless 'gnu_inline' attribute
2309 if (TREE_CODE (newdecl
) == FUNCTION_DECL
2310 && !flag_gnu89_inline
2311 && (DECL_DECLARED_INLINE_P (newdecl
)
2312 || DECL_DECLARED_INLINE_P (olddecl
))
2313 && (!DECL_DECLARED_INLINE_P (newdecl
)
2314 || !DECL_DECLARED_INLINE_P (olddecl
)
2315 || !DECL_EXTERNAL (olddecl
))
2316 && DECL_EXTERNAL (newdecl
)
2317 && !lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (newdecl
))
2318 && !current_function_decl
)
2319 DECL_EXTERNAL (newdecl
) = 0;
2321 if (DECL_EXTERNAL (newdecl
))
2323 TREE_STATIC (newdecl
) = TREE_STATIC (olddecl
);
2324 DECL_EXTERNAL (newdecl
) = DECL_EXTERNAL (olddecl
);
2326 /* An extern decl does not override previous storage class. */
2327 TREE_PUBLIC (newdecl
) = TREE_PUBLIC (olddecl
);
2328 if (!DECL_EXTERNAL (newdecl
))
2330 DECL_CONTEXT (newdecl
) = DECL_CONTEXT (olddecl
);
2331 DECL_COMMON (newdecl
) = DECL_COMMON (olddecl
);
2336 TREE_STATIC (olddecl
) = TREE_STATIC (newdecl
);
2337 TREE_PUBLIC (olddecl
) = TREE_PUBLIC (newdecl
);
2340 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2342 /* If we're redefining a function previously defined as extern
2343 inline, make sure we emit debug info for the inline before we
2344 throw it away, in case it was inlined into a function that
2345 hasn't been written out yet. */
2346 if (new_is_definition
&& DECL_INITIAL (olddecl
))
2347 /* The new defn must not be inline. */
2348 DECL_UNINLINABLE (newdecl
) = 1;
2351 /* If either decl says `inline', this fn is inline, unless
2352 its definition was passed already. */
2353 if (DECL_DECLARED_INLINE_P (newdecl
)
2354 || DECL_DECLARED_INLINE_P (olddecl
))
2355 DECL_DECLARED_INLINE_P (newdecl
) = 1;
2357 DECL_UNINLINABLE (newdecl
) = DECL_UNINLINABLE (olddecl
)
2358 = (DECL_UNINLINABLE (newdecl
) || DECL_UNINLINABLE (olddecl
));
2360 DECL_DISREGARD_INLINE_LIMITS (newdecl
)
2361 = DECL_DISREGARD_INLINE_LIMITS (olddecl
)
2362 = (DECL_DISREGARD_INLINE_LIMITS (newdecl
)
2363 || DECL_DISREGARD_INLINE_LIMITS (olddecl
));
2366 if (DECL_BUILT_IN (olddecl
))
2368 /* If redeclaring a builtin function, it stays built in.
2369 But it gets tagged as having been declared. */
2370 DECL_BUILT_IN_CLASS (newdecl
) = DECL_BUILT_IN_CLASS (olddecl
);
2371 DECL_FUNCTION_CODE (newdecl
) = DECL_FUNCTION_CODE (olddecl
);
2372 C_DECL_DECLARED_BUILTIN (newdecl
) = 1;
2373 if (new_is_prototype
)
2374 C_DECL_BUILTIN_PROTOTYPE (newdecl
) = 0;
2376 C_DECL_BUILTIN_PROTOTYPE (newdecl
)
2377 = C_DECL_BUILTIN_PROTOTYPE (olddecl
);
2380 /* Preserve function specific target and optimization options */
2381 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl
)
2382 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl
))
2383 DECL_FUNCTION_SPECIFIC_TARGET (newdecl
)
2384 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl
);
2386 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl
)
2387 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl
))
2388 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl
)
2389 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl
);
2391 /* Also preserve various other info from the definition. */
2392 if (!new_is_definition
)
2395 DECL_RESULT (newdecl
) = DECL_RESULT (olddecl
);
2396 DECL_INITIAL (newdecl
) = DECL_INITIAL (olddecl
);
2397 DECL_STRUCT_FUNCTION (newdecl
) = DECL_STRUCT_FUNCTION (olddecl
);
2398 DECL_SAVED_TREE (newdecl
) = DECL_SAVED_TREE (olddecl
);
2399 DECL_ARGUMENTS (newdecl
) = copy_list (DECL_ARGUMENTS (olddecl
));
2400 for (t
= DECL_ARGUMENTS (newdecl
); t
; t
= DECL_CHAIN (t
))
2401 DECL_CONTEXT (t
) = newdecl
;
2403 /* See if we've got a function to instantiate from. */
2404 if (DECL_SAVED_TREE (olddecl
))
2405 DECL_ABSTRACT_ORIGIN (newdecl
)
2406 = DECL_ABSTRACT_ORIGIN (olddecl
);
2410 extern_changed
= DECL_EXTERNAL (olddecl
) && !DECL_EXTERNAL (newdecl
);
2412 /* Merge the USED information. */
2413 if (TREE_USED (olddecl
))
2414 TREE_USED (newdecl
) = 1;
2415 else if (TREE_USED (newdecl
))
2416 TREE_USED (olddecl
) = 1;
2417 if (TREE_CODE (olddecl
) == VAR_DECL
|| TREE_CODE (olddecl
) == PARM_DECL
)
2418 DECL_READ_P (newdecl
) |= DECL_READ_P (olddecl
);
2419 if (DECL_PRESERVE_P (olddecl
))
2420 DECL_PRESERVE_P (newdecl
) = 1;
2421 else if (DECL_PRESERVE_P (newdecl
))
2422 DECL_PRESERVE_P (olddecl
) = 1;
2424 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
2425 But preserve OLDDECL's DECL_UID, DECL_CONTEXT and
2426 DECL_ARGUMENTS (if appropriate). */
2428 unsigned olddecl_uid
= DECL_UID (olddecl
);
2429 tree olddecl_context
= DECL_CONTEXT (olddecl
);
2430 tree olddecl_arguments
= NULL
;
2431 if (TREE_CODE (olddecl
) == FUNCTION_DECL
)
2432 olddecl_arguments
= DECL_ARGUMENTS (olddecl
);
2434 memcpy ((char *) olddecl
+ sizeof (struct tree_common
),
2435 (char *) newdecl
+ sizeof (struct tree_common
),
2436 sizeof (struct tree_decl_common
) - sizeof (struct tree_common
));
2437 switch (TREE_CODE (olddecl
))
2447 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
2448 (char *) newdecl
+ sizeof (struct tree_decl_common
),
2449 tree_code_size (TREE_CODE (olddecl
)) - sizeof (struct tree_decl_common
));
2454 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
2455 (char *) newdecl
+ sizeof (struct tree_decl_common
),
2456 sizeof (struct tree_decl_non_common
) - sizeof (struct tree_decl_common
));
2458 DECL_UID (olddecl
) = olddecl_uid
;
2459 DECL_CONTEXT (olddecl
) = olddecl_context
;
2460 if (TREE_CODE (olddecl
) == FUNCTION_DECL
)
2461 DECL_ARGUMENTS (olddecl
) = olddecl_arguments
;
2464 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
2465 so that encode_section_info has a chance to look at the new decl
2466 flags and attributes. */
2467 if (DECL_RTL_SET_P (olddecl
)
2468 && (TREE_CODE (olddecl
) == FUNCTION_DECL
2469 || (TREE_CODE (olddecl
) == VAR_DECL
2470 && TREE_STATIC (olddecl
))))
2471 make_decl_rtl (olddecl
);
2473 /* If we changed a function from DECL_EXTERNAL to !DECL_EXTERNAL,
2474 and the definition is coming from the old version, cgraph needs
2475 to be called again. */
2476 if (extern_changed
&& !new_is_definition
2477 && TREE_CODE (olddecl
) == FUNCTION_DECL
&& DECL_INITIAL (olddecl
))
2478 cgraph_mark_if_needed (olddecl
);
2481 /* Handle when a new declaration NEWDECL has the same name as an old
2482 one OLDDECL in the same binding contour. Prints an error message
2485 If safely possible, alter OLDDECL to look like NEWDECL, and return
2486 true. Otherwise, return false. */
2489 duplicate_decls (tree newdecl
, tree olddecl
)
2491 tree newtype
= NULL
, oldtype
= NULL
;
2493 if (!diagnose_mismatched_decls (newdecl
, olddecl
, &newtype
, &oldtype
))
2495 /* Avoid `unused variable' and other warnings for OLDDECL. */
2496 TREE_NO_WARNING (olddecl
) = 1;
2500 merge_decls (newdecl
, olddecl
, newtype
, oldtype
);
2505 /* Check whether decl-node NEW_DECL shadows an existing declaration. */
2507 warn_if_shadowing (tree new_decl
)
2509 struct c_binding
*b
;
2511 /* Shadow warnings wanted? */
2513 /* No shadow warnings for internally generated vars. */
2514 || DECL_IS_BUILTIN (new_decl
)
2515 /* No shadow warnings for vars made for inlining. */
2516 || DECL_FROM_INLINE (new_decl
))
2519 /* Is anything being shadowed? Invisible decls do not count. */
2520 for (b
= I_SYMBOL_BINDING (DECL_NAME (new_decl
)); b
; b
= b
->shadowed
)
2521 if (b
->decl
&& b
->decl
!= new_decl
&& !b
->invisible
)
2523 tree old_decl
= b
->decl
;
2525 if (old_decl
== error_mark_node
)
2527 warning (OPT_Wshadow
, "declaration of %q+D shadows previous "
2528 "non-variable", new_decl
);
2531 else if (TREE_CODE (old_decl
) == PARM_DECL
)
2532 warning (OPT_Wshadow
, "declaration of %q+D shadows a parameter",
2534 else if (DECL_FILE_SCOPE_P (old_decl
))
2535 warning (OPT_Wshadow
, "declaration of %q+D shadows a global "
2536 "declaration", new_decl
);
2537 else if (TREE_CODE (old_decl
) == FUNCTION_DECL
2538 && DECL_BUILT_IN (old_decl
))
2540 warning (OPT_Wshadow
, "declaration of %q+D shadows "
2541 "a built-in function", new_decl
);
2545 warning (OPT_Wshadow
, "declaration of %q+D shadows a previous local",
2548 warning_at (DECL_SOURCE_LOCATION (old_decl
), OPT_Wshadow
,
2549 "shadowed declaration is here");
2555 /* Record a decl-node X as belonging to the current lexical scope.
2556 Check for errors (such as an incompatible declaration for the same
2557 name already seen in the same scope).
2559 Returns either X or an old decl for the same name.
2560 If an old decl is returned, it may have been smashed
2561 to agree with what X says. */
2566 tree name
= DECL_NAME (x
);
2567 struct c_scope
*scope
= current_scope
;
2568 struct c_binding
*b
;
2569 bool nested
= false;
2570 location_t locus
= DECL_SOURCE_LOCATION (x
);
2572 /* Must set DECL_CONTEXT for everything not at file scope or
2573 DECL_FILE_SCOPE_P won't work. Local externs don't count
2574 unless they have initializers (which generate code). */
2575 if (current_function_decl
2576 && ((TREE_CODE (x
) != FUNCTION_DECL
&& TREE_CODE (x
) != VAR_DECL
)
2577 || DECL_INITIAL (x
) || !DECL_EXTERNAL (x
)))
2578 DECL_CONTEXT (x
) = current_function_decl
;
2580 /* Anonymous decls are just inserted in the scope. */
2583 bind (name
, x
, scope
, /*invisible=*/false, /*nested=*/false,
2588 /* First, see if there is another declaration with the same name in
2589 the current scope. If there is, duplicate_decls may do all the
2590 work for us. If duplicate_decls returns false, that indicates
2591 two incompatible decls in the same scope; we are to silently
2592 replace the old one (duplicate_decls has issued all appropriate
2593 diagnostics). In particular, we should not consider possible
2594 duplicates in the external scope, or shadowing. */
2595 b
= I_SYMBOL_BINDING (name
);
2596 if (b
&& B_IN_SCOPE (b
, scope
))
2598 struct c_binding
*b_ext
, *b_use
;
2599 tree type
= TREE_TYPE (x
);
2600 tree visdecl
= b
->decl
;
2601 tree vistype
= TREE_TYPE (visdecl
);
2602 if (TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
2603 && COMPLETE_TYPE_P (TREE_TYPE (x
)))
2604 b
->inner_comp
= false;
2607 /* If this is an external linkage declaration, we should check
2608 for compatibility with the type in the external scope before
2609 setting the type at this scope based on the visible
2610 information only. */
2611 if (TREE_PUBLIC (x
) && TREE_PUBLIC (visdecl
))
2613 while (b_ext
&& !B_IN_EXTERNAL_SCOPE (b_ext
))
2614 b_ext
= b_ext
->shadowed
;
2619 TREE_TYPE (b_use
->decl
) = b_use
->u
.type
;
2622 if (duplicate_decls (x
, b_use
->decl
))
2626 /* Save the updated type in the external scope and
2627 restore the proper type for this scope. */
2629 if (comptypes (vistype
, type
))
2630 thistype
= composite_type (vistype
, type
);
2632 thistype
= TREE_TYPE (b_use
->decl
);
2633 b_use
->u
.type
= TREE_TYPE (b_use
->decl
);
2634 if (TREE_CODE (b_use
->decl
) == FUNCTION_DECL
2635 && DECL_BUILT_IN (b_use
->decl
))
2637 = build_type_attribute_variant (thistype
,
2640 TREE_TYPE (b_use
->decl
) = thistype
;
2645 goto skip_external_and_shadow_checks
;
2648 /* All declarations with external linkage, and all external
2649 references, go in the external scope, no matter what scope is
2650 current. However, the binding in that scope is ignored for
2651 purposes of normal name lookup. A separate binding structure is
2652 created in the requested scope; this governs the normal
2653 visibility of the symbol.
2655 The binding in the externals scope is used exclusively for
2656 detecting duplicate declarations of the same object, no matter
2657 what scope they are in; this is what we do here. (C99 6.2.7p2:
2658 All declarations that refer to the same object or function shall
2659 have compatible type; otherwise, the behavior is undefined.) */
2660 if (DECL_EXTERNAL (x
) || scope
== file_scope
)
2662 tree type
= TREE_TYPE (x
);
2665 bool type_saved
= false;
2666 if (b
&& !B_IN_EXTERNAL_SCOPE (b
)
2667 && (TREE_CODE (b
->decl
) == FUNCTION_DECL
2668 || TREE_CODE (b
->decl
) == VAR_DECL
)
2669 && DECL_FILE_SCOPE_P (b
->decl
))
2672 vistype
= TREE_TYPE (visdecl
);
2674 if (scope
!= file_scope
2675 && !DECL_IN_SYSTEM_HEADER (x
))
2676 warning (OPT_Wnested_externs
, "nested extern declaration of %qD", x
);
2678 while (b
&& !B_IN_EXTERNAL_SCOPE (b
))
2680 /* If this decl might be modified, save its type. This is
2681 done here rather than when the decl is first bound
2682 because the type may change after first binding, through
2683 being completed or through attributes being added. If we
2684 encounter multiple such decls, only the first should have
2685 its type saved; the others will already have had their
2686 proper types saved and the types will not have changed as
2687 their scopes will not have been re-entered. */
2688 if (DECL_P (b
->decl
) && DECL_FILE_SCOPE_P (b
->decl
) && !type_saved
)
2690 b
->u
.type
= TREE_TYPE (b
->decl
);
2693 if (B_IN_FILE_SCOPE (b
)
2694 && TREE_CODE (b
->decl
) == VAR_DECL
2695 && TREE_STATIC (b
->decl
)
2696 && TREE_CODE (TREE_TYPE (b
->decl
)) == ARRAY_TYPE
2697 && !TYPE_DOMAIN (TREE_TYPE (b
->decl
))
2698 && TREE_CODE (type
) == ARRAY_TYPE
2699 && TYPE_DOMAIN (type
)
2700 && TYPE_MAX_VALUE (TYPE_DOMAIN (type
))
2701 && !integer_zerop (TYPE_MAX_VALUE (TYPE_DOMAIN (type
))))
2703 /* Array type completed in inner scope, which should be
2704 diagnosed if the completion does not have size 1 and
2705 it does not get completed in the file scope. */
2706 b
->inner_comp
= true;
2711 /* If a matching external declaration has been found, set its
2712 type to the composite of all the types of that declaration.
2713 After the consistency checks, it will be reset to the
2714 composite of the visible types only. */
2715 if (b
&& (TREE_PUBLIC (x
) || same_translation_unit_p (x
, b
->decl
))
2717 TREE_TYPE (b
->decl
) = b
->u
.type
;
2719 /* The point of the same_translation_unit_p check here is,
2720 we want to detect a duplicate decl for a construct like
2721 foo() { extern bar(); } ... static bar(); but not if
2722 they are in different translation units. In any case,
2723 the static does not go in the externals scope. */
2725 && (TREE_PUBLIC (x
) || same_translation_unit_p (x
, b
->decl
))
2726 && duplicate_decls (x
, b
->decl
))
2731 if (comptypes (vistype
, type
))
2732 thistype
= composite_type (vistype
, type
);
2734 thistype
= TREE_TYPE (b
->decl
);
2738 b
->u
.type
= TREE_TYPE (b
->decl
);
2739 if (TREE_CODE (b
->decl
) == FUNCTION_DECL
&& DECL_BUILT_IN (b
->decl
))
2741 = build_type_attribute_variant (thistype
,
2742 TYPE_ATTRIBUTES (b
->u
.type
));
2743 TREE_TYPE (b
->decl
) = thistype
;
2744 bind (name
, b
->decl
, scope
, /*invisible=*/false, /*nested=*/true,
2748 else if (TREE_PUBLIC (x
))
2750 if (visdecl
&& !b
&& duplicate_decls (x
, visdecl
))
2752 /* An external declaration at block scope referring to a
2753 visible entity with internal linkage. The composite
2754 type will already be correct for this scope, so we
2755 just need to fall through to make the declaration in
2762 bind (name
, x
, external_scope
, /*invisible=*/true,
2763 /*nested=*/false, locus
);
2769 if (TREE_CODE (x
) != PARM_DECL
)
2770 warn_if_shadowing (x
);
2772 skip_external_and_shadow_checks
:
2773 if (TREE_CODE (x
) == TYPE_DECL
)
2774 set_underlying_type (x
);
2776 bind (name
, x
, scope
, /*invisible=*/false, nested
, locus
);
2778 /* If x's type is incomplete because it's based on a
2779 structure or union which has not yet been fully declared,
2780 attach it to that structure or union type, so we can go
2781 back and complete the variable declaration later, if the
2782 structure or union gets fully declared.
2784 If the input is erroneous, we can have error_mark in the type
2785 slot (e.g. "f(void a, ...)") - that doesn't count as an
2787 if (TREE_TYPE (x
) != error_mark_node
2788 && !COMPLETE_TYPE_P (TREE_TYPE (x
)))
2790 tree element
= TREE_TYPE (x
);
2792 while (TREE_CODE (element
) == ARRAY_TYPE
)
2793 element
= TREE_TYPE (element
);
2794 element
= TYPE_MAIN_VARIANT (element
);
2796 if ((TREE_CODE (element
) == RECORD_TYPE
2797 || TREE_CODE (element
) == UNION_TYPE
)
2798 && (TREE_CODE (x
) != TYPE_DECL
2799 || TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
)
2800 && !COMPLETE_TYPE_P (element
))
2801 C_TYPE_INCOMPLETE_VARS (element
)
2802 = tree_cons (NULL_TREE
, x
, C_TYPE_INCOMPLETE_VARS (element
));
2807 /* Record X as belonging to file scope.
2808 This is used only internally by the Objective-C front end,
2809 and is limited to its needs. duplicate_decls is not called;
2810 if there is any preexisting decl for this identifier, it is an ICE. */
2813 pushdecl_top_level (tree x
)
2816 bool nested
= false;
2817 gcc_assert (TREE_CODE (x
) == VAR_DECL
|| TREE_CODE (x
) == CONST_DECL
);
2819 name
= DECL_NAME (x
);
2821 gcc_assert (TREE_CODE (x
) == CONST_DECL
|| !I_SYMBOL_BINDING (name
));
2823 if (TREE_PUBLIC (x
))
2825 bind (name
, x
, external_scope
, /*invisible=*/true, /*nested=*/false,
2830 bind (name
, x
, file_scope
, /*invisible=*/false, nested
, UNKNOWN_LOCATION
);
2836 implicit_decl_warning (tree id
, tree olddecl
)
2838 if (warn_implicit_function_declaration
)
2843 warned
= pedwarn (input_location
, OPT_Wimplicit_function_declaration
,
2844 "implicit declaration of function %qE", id
);
2846 warned
= warning (OPT_Wimplicit_function_declaration
,
2847 G_("implicit declaration of function %qE"), id
);
2848 if (olddecl
&& warned
)
2849 locate_old_decl (olddecl
);
2853 /* Generate an implicit declaration for identifier FUNCTIONID at LOC as a
2854 function of type int (). */
2857 implicitly_declare (location_t loc
, tree functionid
)
2859 struct c_binding
*b
;
2863 for (b
= I_SYMBOL_BINDING (functionid
); b
; b
= b
->shadowed
)
2865 if (B_IN_SCOPE (b
, external_scope
))
2874 if (decl
== error_mark_node
)
2877 /* FIXME: Objective-C has weird not-really-builtin functions
2878 which are supposed to be visible automatically. They wind up
2879 in the external scope because they're pushed before the file
2880 scope gets created. Catch this here and rebind them into the
2882 if (!DECL_BUILT_IN (decl
) && DECL_IS_BUILTIN (decl
))
2884 bind (functionid
, decl
, file_scope
,
2885 /*invisible=*/false, /*nested=*/true,
2886 DECL_SOURCE_LOCATION (decl
));
2891 tree newtype
= default_function_type
;
2893 TREE_TYPE (decl
) = b
->u
.type
;
2894 /* Implicit declaration of a function already declared
2895 (somehow) in a different scope, or as a built-in.
2896 If this is the first time this has happened, warn;
2897 then recycle the old declaration but with the new type. */
2898 if (!C_DECL_IMPLICIT (decl
))
2900 implicit_decl_warning (functionid
, decl
);
2901 C_DECL_IMPLICIT (decl
) = 1;
2903 if (DECL_BUILT_IN (decl
))
2905 newtype
= build_type_attribute_variant (newtype
,
2907 (TREE_TYPE (decl
)));
2908 if (!comptypes (newtype
, TREE_TYPE (decl
)))
2910 warning_at (loc
, 0, "incompatible implicit declaration of "
2911 "built-in function %qD", decl
);
2912 newtype
= TREE_TYPE (decl
);
2917 if (!comptypes (newtype
, TREE_TYPE (decl
)))
2919 error_at (loc
, "incompatible implicit declaration of function %qD", decl
);
2920 locate_old_decl (decl
);
2923 b
->u
.type
= TREE_TYPE (decl
);
2924 TREE_TYPE (decl
) = newtype
;
2925 bind (functionid
, decl
, current_scope
,
2926 /*invisible=*/false, /*nested=*/true,
2927 DECL_SOURCE_LOCATION (decl
));
2932 /* Not seen before. */
2933 decl
= build_decl (loc
, FUNCTION_DECL
, functionid
, default_function_type
);
2934 DECL_EXTERNAL (decl
) = 1;
2935 TREE_PUBLIC (decl
) = 1;
2936 C_DECL_IMPLICIT (decl
) = 1;
2937 implicit_decl_warning (functionid
, 0);
2938 asmspec_tree
= maybe_apply_renaming_pragma (decl
, /*asmname=*/NULL
);
2940 set_user_assembler_name (decl
, TREE_STRING_POINTER (asmspec_tree
));
2942 /* C89 says implicit declarations are in the innermost block.
2943 So we record the decl in the standard fashion. */
2944 decl
= pushdecl (decl
);
2946 /* No need to call objc_check_decl here - it's a function type. */
2947 rest_of_decl_compilation (decl
, 0, 0);
2949 /* Write a record describing this implicit function declaration
2950 to the prototypes file (if requested). */
2951 gen_aux_info_record (decl
, 0, 1, 0);
2953 /* Possibly apply some default attributes to this implicit declaration. */
2954 decl_attributes (&decl
, NULL_TREE
, 0);
2959 /* Issue an error message for a reference to an undeclared variable
2960 ID, including a reference to a builtin outside of function-call
2961 context. Establish a binding of the identifier to error_mark_node
2962 in an appropriate scope, which will suppress further errors for the
2963 same identifier. The error message should be given location LOC. */
2965 undeclared_variable (location_t loc
, tree id
)
2967 static bool already
= false;
2968 struct c_scope
*scope
;
2970 if (current_function_decl
== 0)
2972 error_at (loc
, "%qE undeclared here (not in a function)", id
);
2973 scope
= current_scope
;
2977 if (!objc_diagnose_private_ivar (id
))
2978 error_at (loc
, "%qE undeclared (first use in this function)", id
);
2981 inform (loc
, "each undeclared identifier is reported only"
2982 " once for each function it appears in");
2986 /* If we are parsing old-style parameter decls, current_function_decl
2987 will be nonnull but current_function_scope will be null. */
2988 scope
= current_function_scope
? current_function_scope
: current_scope
;
2990 bind (id
, error_mark_node
, scope
, /*invisible=*/false, /*nested=*/false,
2994 /* Subroutine of lookup_label, declare_label, define_label: construct a
2995 LABEL_DECL with all the proper frills. Also create a struct
2996 c_label_vars initialized for the current scope. */
2999 make_label (location_t location
, tree name
, bool defining
,
3000 struct c_label_vars
**p_label_vars
)
3002 tree label
= build_decl (location
, LABEL_DECL
, name
, void_type_node
);
3003 struct c_label_vars
*label_vars
;
3005 DECL_CONTEXT (label
) = current_function_decl
;
3006 DECL_MODE (label
) = VOIDmode
;
3008 label_vars
= ggc_alloc_c_label_vars ();
3009 label_vars
->shadowed
= NULL
;
3010 set_spot_bindings (&label_vars
->label_bindings
, defining
);
3011 label_vars
->decls_in_scope
= make_tree_vector ();
3012 label_vars
->gotos
= VEC_alloc (c_goto_bindings_p
, gc
, 0);
3013 *p_label_vars
= label_vars
;
3018 /* Get the LABEL_DECL corresponding to identifier NAME as a label.
3019 Create one if none exists so far for the current function.
3020 This is called when a label is used in a goto expression or
3021 has its address taken. */
3024 lookup_label (tree name
)
3027 struct c_label_vars
*label_vars
;
3029 if (current_function_scope
== 0)
3031 error ("label %qE referenced outside of any function", name
);
3035 /* Use a label already defined or ref'd with this name, but not if
3036 it is inherited from a containing function and wasn't declared
3038 label
= I_LABEL_DECL (name
);
3039 if (label
&& (DECL_CONTEXT (label
) == current_function_decl
3040 || C_DECLARED_LABEL_FLAG (label
)))
3042 /* If the label has only been declared, update its apparent
3043 location to point here, for better diagnostics if it
3044 turns out not to have been defined. */
3045 if (DECL_INITIAL (label
) == NULL_TREE
)
3046 DECL_SOURCE_LOCATION (label
) = input_location
;
3050 /* No label binding for that identifier; make one. */
3051 label
= make_label (input_location
, name
, false, &label_vars
);
3053 /* Ordinary labels go in the current function scope. */
3054 bind_label (name
, label
, current_function_scope
, label_vars
);
3059 /* Issue a warning about DECL for a goto statement at GOTO_LOC going
3063 warn_about_goto (location_t goto_loc
, tree label
, tree decl
)
3065 if (variably_modified_type_p (TREE_TYPE (decl
), NULL_TREE
))
3067 "jump into scope of identifier with variably modified type");
3069 warning_at (goto_loc
, OPT_Wjump_misses_init
,
3070 "jump skips variable initialization");
3071 inform (DECL_SOURCE_LOCATION (label
), "label %qD defined here", label
);
3072 inform (DECL_SOURCE_LOCATION (decl
), "%qD declared here", decl
);
3075 /* Look up a label because of a goto statement. This is like
3076 lookup_label, but also issues any appropriate warnings. */
3079 lookup_label_for_goto (location_t loc
, tree name
)
3082 struct c_label_vars
*label_vars
;
3086 label
= lookup_label (name
);
3087 if (label
== NULL_TREE
)
3090 /* If we are jumping to a different function, we can't issue any
3092 if (DECL_CONTEXT (label
) != current_function_decl
)
3094 gcc_assert (C_DECLARED_LABEL_FLAG (label
));
3098 label_vars
= I_LABEL_BINDING (name
)->u
.label
;
3100 /* If the label has not yet been defined, then push this goto on a
3101 list for possible later warnings. */
3102 if (label_vars
->label_bindings
.scope
== NULL
)
3104 struct c_goto_bindings
*g
;
3106 g
= ggc_alloc_c_goto_bindings ();
3108 set_spot_bindings (&g
->goto_bindings
, true);
3109 VEC_safe_push (c_goto_bindings_p
, gc
, label_vars
->gotos
, g
);
3113 /* If there are any decls in label_vars->decls_in_scope, then this
3114 goto has missed the declaration of the decl. This happens for a
3120 Issue a warning or error. */
3121 FOR_EACH_VEC_ELT (tree
, label_vars
->decls_in_scope
, ix
, decl
)
3122 warn_about_goto (loc
, label
, decl
);
3124 if (label_vars
->label_bindings
.left_stmt_expr
)
3126 error_at (loc
, "jump into statement expression");
3127 inform (DECL_SOURCE_LOCATION (label
), "label %qD defined here", label
);
3133 /* Make a label named NAME in the current function, shadowing silently
3134 any that may be inherited from containing functions or containing
3135 scopes. This is called for __label__ declarations. */
3138 declare_label (tree name
)
3140 struct c_binding
*b
= I_LABEL_BINDING (name
);
3142 struct c_label_vars
*label_vars
;
3144 /* Check to make sure that the label hasn't already been declared
3146 if (b
&& B_IN_CURRENT_SCOPE (b
))
3148 error ("duplicate label declaration %qE", name
);
3149 locate_old_decl (b
->decl
);
3151 /* Just use the previous declaration. */
3155 label
= make_label (input_location
, name
, false, &label_vars
);
3156 C_DECLARED_LABEL_FLAG (label
) = 1;
3158 /* Declared labels go in the current scope. */
3159 bind_label (name
, label
, current_scope
, label_vars
);
3164 /* When we define a label, issue any appropriate warnings if there are
3165 any gotos earlier in the function which jump to this label. */
3168 check_earlier_gotos (tree label
, struct c_label_vars
* label_vars
)
3171 struct c_goto_bindings
*g
;
3173 FOR_EACH_VEC_ELT (c_goto_bindings_p
, label_vars
->gotos
, ix
, g
)
3175 struct c_binding
*b
;
3176 struct c_scope
*scope
;
3178 /* We have a goto to this label. The goto is going forward. In
3179 g->scope, the goto is going to skip any binding which was
3180 defined after g->bindings_in_scope. */
3181 if (g
->goto_bindings
.scope
->has_jump_unsafe_decl
)
3183 for (b
= g
->goto_bindings
.scope
->bindings
;
3184 b
!= g
->goto_bindings
.bindings_in_scope
;
3187 if (decl_jump_unsafe (b
->decl
))
3188 warn_about_goto (g
->loc
, label
, b
->decl
);
3192 /* We also need to warn about decls defined in any scopes
3193 between the scope of the label and the scope of the goto. */
3194 for (scope
= label_vars
->label_bindings
.scope
;
3195 scope
!= g
->goto_bindings
.scope
;
3196 scope
= scope
->outer
)
3198 gcc_assert (scope
!= NULL
);
3199 if (scope
->has_jump_unsafe_decl
)
3201 if (scope
== label_vars
->label_bindings
.scope
)
3202 b
= label_vars
->label_bindings
.bindings_in_scope
;
3204 b
= scope
->bindings
;
3205 for (; b
!= NULL
; b
= b
->prev
)
3207 if (decl_jump_unsafe (b
->decl
))
3208 warn_about_goto (g
->loc
, label
, b
->decl
);
3213 if (g
->goto_bindings
.stmt_exprs
> 0)
3215 error_at (g
->loc
, "jump into statement expression");
3216 inform (DECL_SOURCE_LOCATION (label
), "label %qD defined here",
3221 /* Now that the label is defined, we will issue warnings about
3222 subsequent gotos to this label when we see them. */
3223 VEC_truncate (c_goto_bindings_p
, label_vars
->gotos
, 0);
3224 label_vars
->gotos
= NULL
;
3227 /* Define a label, specifying the location in the source file.
3228 Return the LABEL_DECL node for the label, if the definition is valid.
3229 Otherwise return 0. */
3232 define_label (location_t location
, tree name
)
3234 /* Find any preexisting label with this name. It is an error
3235 if that label has already been defined in this function, or
3236 if there is a containing function with a declared label with
3238 tree label
= I_LABEL_DECL (name
);
3241 && ((DECL_CONTEXT (label
) == current_function_decl
3242 && DECL_INITIAL (label
) != 0)
3243 || (DECL_CONTEXT (label
) != current_function_decl
3244 && C_DECLARED_LABEL_FLAG (label
))))
3246 error_at (location
, "duplicate label %qD", label
);
3247 locate_old_decl (label
);
3250 else if (label
&& DECL_CONTEXT (label
) == current_function_decl
)
3252 struct c_label_vars
*label_vars
= I_LABEL_BINDING (name
)->u
.label
;
3254 /* The label has been used or declared already in this function,
3255 but not defined. Update its location to point to this
3257 DECL_SOURCE_LOCATION (label
) = location
;
3258 set_spot_bindings (&label_vars
->label_bindings
, true);
3260 /* Issue warnings as required about any goto statements from
3261 earlier in the function. */
3262 check_earlier_gotos (label
, label_vars
);
3266 struct c_label_vars
*label_vars
;
3268 /* No label binding for that identifier; make one. */
3269 label
= make_label (location
, name
, true, &label_vars
);
3271 /* Ordinary labels go in the current function scope. */
3272 bind_label (name
, label
, current_function_scope
, label_vars
);
3275 if (!in_system_header
&& lookup_name (name
))
3276 warning_at (location
, OPT_Wtraditional
,
3277 "traditional C lacks a separate namespace "
3278 "for labels, identifier %qE conflicts", name
);
3280 /* Mark label as having been defined. */
3281 DECL_INITIAL (label
) = error_mark_node
;
3285 /* Get the bindings for a new switch statement. This is used to issue
3286 warnings as appropriate for jumps from the switch to case or
3289 struct c_spot_bindings
*
3290 c_get_switch_bindings (void)
3292 struct c_spot_bindings
*switch_bindings
;
3294 switch_bindings
= XNEW (struct c_spot_bindings
);
3295 set_spot_bindings (switch_bindings
, true);
3296 return switch_bindings
;
3300 c_release_switch_bindings (struct c_spot_bindings
*bindings
)
3302 gcc_assert (bindings
->stmt_exprs
== 0 && !bindings
->left_stmt_expr
);
3306 /* This is called at the point of a case or default label to issue
3307 warnings about decls as needed. It returns true if it found an
3308 error, not just a warning. */
3311 c_check_switch_jump_warnings (struct c_spot_bindings
*switch_bindings
,
3312 location_t switch_loc
, location_t case_loc
)
3315 struct c_scope
*scope
;
3318 for (scope
= current_scope
;
3319 scope
!= switch_bindings
->scope
;
3320 scope
= scope
->outer
)
3322 struct c_binding
*b
;
3324 gcc_assert (scope
!= NULL
);
3326 if (!scope
->has_jump_unsafe_decl
)
3329 for (b
= scope
->bindings
; b
!= NULL
; b
= b
->prev
)
3331 if (decl_jump_unsafe (b
->decl
))
3333 if (variably_modified_type_p (TREE_TYPE (b
->decl
), NULL_TREE
))
3337 ("switch jumps into scope of identifier with "
3338 "variably modified type"));
3341 warning_at (case_loc
, OPT_Wjump_misses_init
,
3342 "switch jumps over variable initialization");
3343 inform (switch_loc
, "switch starts here");
3344 inform (DECL_SOURCE_LOCATION (b
->decl
), "%qD declared here",
3350 if (switch_bindings
->stmt_exprs
> 0)
3353 error_at (case_loc
, "switch jumps into statement expression");
3354 inform (switch_loc
, "switch starts here");
3360 /* Given NAME, an IDENTIFIER_NODE,
3361 return the structure (or union or enum) definition for that name.
3362 If THISLEVEL_ONLY is nonzero, searches only the current_scope.
3363 CODE says which kind of type the caller wants;
3364 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
3365 If PLOC is not NULL and this returns non-null, it sets *PLOC to the
3366 location where the tag was defined.
3367 If the wrong kind of type is found, an error is reported. */
3370 lookup_tag (enum tree_code code
, tree name
, int thislevel_only
,
3373 struct c_binding
*b
= I_TAG_BINDING (name
);
3379 /* We only care about whether it's in this level if
3380 thislevel_only was set or it might be a type clash. */
3381 if (thislevel_only
|| TREE_CODE (b
->decl
) != code
)
3383 /* For our purposes, a tag in the external scope is the same as
3384 a tag in the file scope. (Primarily relevant to Objective-C
3385 and its builtin structure tags, which get pushed before the
3386 file scope is created.) */
3387 if (B_IN_CURRENT_SCOPE (b
)
3388 || (current_scope
== file_scope
&& B_IN_EXTERNAL_SCOPE (b
)))
3392 if (thislevel_only
&& !thislevel
)
3395 if (TREE_CODE (b
->decl
) != code
)
3397 /* Definition isn't the kind we were looking for. */
3398 pending_invalid_xref
= name
;
3399 pending_invalid_xref_location
= input_location
;
3401 /* If in the same binding level as a declaration as a tag
3402 of a different type, this must not be allowed to
3403 shadow that tag, so give the error immediately.
3404 (For example, "struct foo; union foo;" is invalid.) */
3406 pending_xref_error ();
3415 /* Print an error message now
3416 for a recent invalid struct, union or enum cross reference.
3417 We don't print them immediately because they are not invalid
3418 when used in the `struct foo;' construct for shadowing. */
3421 pending_xref_error (void)
3423 if (pending_invalid_xref
!= 0)
3424 error_at (pending_invalid_xref_location
, "%qE defined as wrong kind of tag",
3425 pending_invalid_xref
);
3426 pending_invalid_xref
= 0;
3430 /* Look up NAME in the current scope and its superiors
3431 in the namespace of variables, functions and typedefs.
3432 Return a ..._DECL node of some kind representing its definition,
3433 or return 0 if it is undefined. */
3436 lookup_name (tree name
)
3438 struct c_binding
*b
= I_SYMBOL_BINDING (name
);
3439 if (b
&& !b
->invisible
)
3444 /* Similar to `lookup_name' but look only at the indicated scope. */
3447 lookup_name_in_scope (tree name
, struct c_scope
*scope
)
3449 struct c_binding
*b
;
3451 for (b
= I_SYMBOL_BINDING (name
); b
; b
= b
->shadowed
)
3452 if (B_IN_SCOPE (b
, scope
))
3457 /* Create the predefined scalar types of C,
3458 and some nodes representing standard constants (0, 1, (void *) 0).
3459 Initialize the global scope.
3460 Make definitions for built-in primitive functions. */
3463 c_init_decl_processing (void)
3465 location_t save_loc
= input_location
;
3467 /* Initialize reserved words for parser. */
3470 current_function_decl
= 0;
3472 gcc_obstack_init (&parser_obstack
);
3474 /* Make the externals scope. */
3476 external_scope
= current_scope
;
3478 /* Declarations from c_common_nodes_and_builtins must not be associated
3479 with this input file, lest we get differences between using and not
3480 using preprocessed headers. */
3481 input_location
= BUILTINS_LOCATION
;
3483 build_common_tree_nodes (flag_signed_char
);
3485 c_common_nodes_and_builtins ();
3487 /* In C, comparisons and TRUTH_* expressions have type int. */
3488 truthvalue_type_node
= integer_type_node
;
3489 truthvalue_true_node
= integer_one_node
;
3490 truthvalue_false_node
= integer_zero_node
;
3492 /* Even in C99, which has a real boolean type. */
3493 pushdecl (build_decl (UNKNOWN_LOCATION
, TYPE_DECL
, get_identifier ("_Bool"),
3494 boolean_type_node
));
3496 input_location
= save_loc
;
3498 pedantic_lvalues
= true;
3500 make_fname_decl
= c_make_fname_decl
;
3501 start_fname_decls ();
3504 /* Create the VAR_DECL at LOC for __FUNCTION__ etc. ID is the name to
3505 give the decl, NAME is the initialization string and TYPE_DEP
3506 indicates whether NAME depended on the type of the function. As we
3507 don't yet implement delayed emission of static data, we mark the
3508 decl as emitted so it is not placed in the output. Anything using
3509 it must therefore pull out the STRING_CST initializer directly.
3513 c_make_fname_decl (location_t loc
, tree id
, int type_dep
)
3515 const char *name
= fname_as_string (type_dep
);
3516 tree decl
, type
, init
;
3517 size_t length
= strlen (name
);
3519 type
= build_array_type (char_type_node
,
3520 build_index_type (size_int (length
)));
3521 type
= c_build_qualified_type (type
, TYPE_QUAL_CONST
);
3523 decl
= build_decl (loc
, VAR_DECL
, id
, type
);
3525 TREE_STATIC (decl
) = 1;
3526 TREE_READONLY (decl
) = 1;
3527 DECL_ARTIFICIAL (decl
) = 1;
3529 init
= build_string (length
+ 1, name
);
3530 free (CONST_CAST (char *, name
));
3531 TREE_TYPE (init
) = type
;
3532 DECL_INITIAL (decl
) = init
;
3534 TREE_USED (decl
) = 1;
3536 if (current_function_decl
3537 /* For invalid programs like this:
3540 const char* p = __FUNCTION__;
3542 the __FUNCTION__ is believed to appear in K&R style function
3543 parameter declarator. In that case we still don't have
3545 && (!seen_error () || current_function_scope
))
3547 DECL_CONTEXT (decl
) = current_function_decl
;
3548 bind (id
, decl
, current_function_scope
,
3549 /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION
);
3552 finish_decl (decl
, loc
, init
, NULL_TREE
, NULL_TREE
);
3558 c_builtin_function (tree decl
)
3560 tree type
= TREE_TYPE (decl
);
3561 tree id
= DECL_NAME (decl
);
3563 const char *name
= IDENTIFIER_POINTER (id
);
3564 C_DECL_BUILTIN_PROTOTYPE (decl
) = prototype_p (type
);
3566 /* Should never be called on a symbol with a preexisting meaning. */
3567 gcc_assert (!I_SYMBOL_BINDING (id
));
3569 bind (id
, decl
, external_scope
, /*invisible=*/true, /*nested=*/false,
3572 /* Builtins in the implementation namespace are made visible without
3573 needing to be explicitly declared. See push_file_scope. */
3574 if (name
[0] == '_' && (name
[1] == '_' || ISUPPER (name
[1])))
3576 DECL_CHAIN (decl
) = visible_builtins
;
3577 visible_builtins
= decl
;
3584 c_builtin_function_ext_scope (tree decl
)
3586 tree type
= TREE_TYPE (decl
);
3587 tree id
= DECL_NAME (decl
);
3589 const char *name
= IDENTIFIER_POINTER (id
);
3590 C_DECL_BUILTIN_PROTOTYPE (decl
) = prototype_p (type
);
3592 /* Should never be called on a symbol with a preexisting meaning. */
3593 gcc_assert (!I_SYMBOL_BINDING (id
));
3595 bind (id
, decl
, external_scope
, /*invisible=*/false, /*nested=*/false,
3598 /* Builtins in the implementation namespace are made visible without
3599 needing to be explicitly declared. See push_file_scope. */
3600 if (name
[0] == '_' && (name
[1] == '_' || ISUPPER (name
[1])))
3602 DECL_CHAIN (decl
) = visible_builtins
;
3603 visible_builtins
= decl
;
3609 /* Called when a declaration is seen that contains no names to declare.
3610 If its type is a reference to a structure, union or enum inherited
3611 from a containing scope, shadow that tag name for the current scope
3612 with a forward reference.
3613 If its type defines a new named structure or union
3614 or defines an enum, it is valid but we need not do anything here.
3615 Otherwise, it is an error. */
3618 shadow_tag (const struct c_declspecs
*declspecs
)
3620 shadow_tag_warned (declspecs
, 0);
3623 /* WARNED is 1 if we have done a pedwarn, 2 if we have done a warning,
3626 shadow_tag_warned (const struct c_declspecs
*declspecs
, int warned
)
3628 bool found_tag
= false;
3630 if (declspecs
->type
&& !declspecs
->default_int_p
&& !declspecs
->typedef_p
)
3632 tree value
= declspecs
->type
;
3633 enum tree_code code
= TREE_CODE (value
);
3635 if (code
== RECORD_TYPE
|| code
== UNION_TYPE
|| code
== ENUMERAL_TYPE
)
3636 /* Used to test also that TYPE_SIZE (value) != 0.
3637 That caused warning for `struct foo;' at top level in the file. */
3639 tree name
= TYPE_NAME (value
);
3644 if (declspecs
->restrict_p
)
3646 error ("invalid use of %<restrict%>");
3652 if (warned
!= 1 && code
!= ENUMERAL_TYPE
)
3653 /* Empty unnamed enum OK */
3655 pedwarn (input_location
, 0,
3656 "unnamed struct/union that defines no instances");
3660 else if (declspecs
->typespec_kind
!= ctsk_tagdef
3661 && declspecs
->typespec_kind
!= ctsk_tagfirstref
3662 && declspecs
->storage_class
!= csc_none
)
3665 pedwarn (input_location
, 0,
3666 "empty declaration with storage class specifier "
3667 "does not redeclare tag");
3669 pending_xref_error ();
3671 else if (declspecs
->typespec_kind
!= ctsk_tagdef
3672 && declspecs
->typespec_kind
!= ctsk_tagfirstref
3673 && (declspecs
->const_p
3674 || declspecs
->volatile_p
3675 || declspecs
->restrict_p
3676 || declspecs
->address_space
))
3679 pedwarn (input_location
, 0,
3680 "empty declaration with type qualifier "
3681 "does not redeclare tag");
3683 pending_xref_error ();
3687 pending_invalid_xref
= 0;
3688 t
= lookup_tag (code
, name
, 1, NULL
);
3692 t
= make_node (code
);
3693 pushtag (input_location
, name
, t
);
3699 if (warned
!= 1 && !in_system_header
)
3701 pedwarn (input_location
, 0,
3702 "useless type name in empty declaration");
3707 else if (warned
!= 1 && !in_system_header
&& declspecs
->typedef_p
)
3709 pedwarn (input_location
, 0, "useless type name in empty declaration");
3713 pending_invalid_xref
= 0;
3715 if (declspecs
->inline_p
)
3717 error ("%<inline%> in empty declaration");
3721 if (current_scope
== file_scope
&& declspecs
->storage_class
== csc_auto
)
3723 error ("%<auto%> in file-scope empty declaration");
3727 if (current_scope
== file_scope
&& declspecs
->storage_class
== csc_register
)
3729 error ("%<register%> in file-scope empty declaration");
3733 if (!warned
&& !in_system_header
&& declspecs
->storage_class
!= csc_none
)
3735 warning (0, "useless storage class specifier in empty declaration");
3739 if (!warned
&& !in_system_header
&& declspecs
->thread_p
)
3741 warning (0, "useless %<__thread%> in empty declaration");
3745 if (!warned
&& !in_system_header
&& (declspecs
->const_p
3746 || declspecs
->volatile_p
3747 || declspecs
->restrict_p
3748 || declspecs
->address_space
))
3750 warning (0, "useless type qualifier in empty declaration");
3757 pedwarn (input_location
, 0, "empty declaration");
3762 /* Return the qualifiers from SPECS as a bitwise OR of TYPE_QUAL_*
3763 bits. SPECS represents declaration specifiers that the grammar
3764 only permits to contain type qualifiers and attributes. */
3767 quals_from_declspecs (const struct c_declspecs
*specs
)
3769 int quals
= ((specs
->const_p
? TYPE_QUAL_CONST
: 0)
3770 | (specs
->volatile_p
? TYPE_QUAL_VOLATILE
: 0)
3771 | (specs
->restrict_p
? TYPE_QUAL_RESTRICT
: 0)
3772 | (ENCODE_QUAL_ADDR_SPACE (specs
->address_space
)));
3773 gcc_assert (!specs
->type
3774 && !specs
->decl_attr
3775 && specs
->typespec_word
== cts_none
3776 && specs
->storage_class
== csc_none
3777 && !specs
->typedef_p
3778 && !specs
->explicit_signed_p
3779 && !specs
->deprecated_p
3781 && !specs
->long_long_p
3784 && !specs
->unsigned_p
3785 && !specs
->complex_p
3787 && !specs
->thread_p
);
3791 /* Construct an array declarator. LOC is the location of the
3792 beginning of the array (usually the opening brace). EXPR is the
3793 expression inside [], or NULL_TREE. QUALS are the type qualifiers
3794 inside the [] (to be applied to the pointer to which a parameter
3795 array is converted). STATIC_P is true if "static" is inside the
3796 [], false otherwise. VLA_UNSPEC_P is true if the array is [*], a
3797 VLA of unspecified length which is nevertheless a complete type,
3798 false otherwise. The field for the contained declarator is left to
3799 be filled in by set_array_declarator_inner. */
3801 struct c_declarator
*
3802 build_array_declarator (location_t loc
,
3803 tree expr
, struct c_declspecs
*quals
, bool static_p
,
3806 struct c_declarator
*declarator
= XOBNEW (&parser_obstack
,
3807 struct c_declarator
);
3808 declarator
->id_loc
= loc
;
3809 declarator
->kind
= cdk_array
;
3810 declarator
->declarator
= 0;
3811 declarator
->u
.array
.dimen
= expr
;
3814 declarator
->u
.array
.attrs
= quals
->attrs
;
3815 declarator
->u
.array
.quals
= quals_from_declspecs (quals
);
3819 declarator
->u
.array
.attrs
= NULL_TREE
;
3820 declarator
->u
.array
.quals
= 0;
3822 declarator
->u
.array
.static_p
= static_p
;
3823 declarator
->u
.array
.vla_unspec_p
= vla_unspec_p
;
3826 if (static_p
|| quals
!= NULL
)
3827 pedwarn (loc
, OPT_pedantic
,
3828 "ISO C90 does not support %<static%> or type "
3829 "qualifiers in parameter array declarators");
3831 pedwarn (loc
, OPT_pedantic
,
3832 "ISO C90 does not support %<[*]%> array declarators");
3836 if (!current_scope
->parm_flag
)
3839 error_at (loc
, "%<[*]%> not allowed in other than "
3840 "function prototype scope");
3841 declarator
->u
.array
.vla_unspec_p
= false;
3844 current_scope
->had_vla_unspec
= true;
3849 /* Set the contained declarator of an array declarator. DECL is the
3850 declarator, as constructed by build_array_declarator; INNER is what
3851 appears on the left of the []. */
3853 struct c_declarator
*
3854 set_array_declarator_inner (struct c_declarator
*decl
,
3855 struct c_declarator
*inner
)
3857 decl
->declarator
= inner
;
3861 /* INIT is a constructor that forms DECL's initializer. If the final
3862 element initializes a flexible array field, add the size of that
3863 initializer to DECL's size. */
3866 add_flexible_array_elts_to_size (tree decl
, tree init
)
3870 if (VEC_empty (constructor_elt
, CONSTRUCTOR_ELTS (init
)))
3873 elt
= VEC_last (constructor_elt
, CONSTRUCTOR_ELTS (init
))->value
;
3874 type
= TREE_TYPE (elt
);
3875 if (TREE_CODE (type
) == ARRAY_TYPE
3876 && TYPE_SIZE (type
) == NULL_TREE
3877 && TYPE_DOMAIN (type
) != NULL_TREE
3878 && TYPE_MAX_VALUE (TYPE_DOMAIN (type
)) == NULL_TREE
)
3880 complete_array_type (&type
, elt
, false);
3882 = size_binop (PLUS_EXPR
, DECL_SIZE (decl
), TYPE_SIZE (type
));
3883 DECL_SIZE_UNIT (decl
)
3884 = size_binop (PLUS_EXPR
, DECL_SIZE_UNIT (decl
), TYPE_SIZE_UNIT (type
));
3888 /* Decode a "typename", such as "int **", returning a ..._TYPE node.
3889 Set *EXPR, if EXPR not NULL, to any expression to be evaluated
3890 before the type name, and set *EXPR_CONST_OPERANDS, if
3891 EXPR_CONST_OPERANDS not NULL, to indicate whether the type name may
3892 appear in a constant expression. */
3895 groktypename (struct c_type_name
*type_name
, tree
*expr
,
3896 bool *expr_const_operands
)
3899 tree attrs
= type_name
->specs
->attrs
;
3901 type_name
->specs
->attrs
= NULL_TREE
;
3903 type
= grokdeclarator (type_name
->declarator
, type_name
->specs
, TYPENAME
,
3904 false, NULL
, &attrs
, expr
, expr_const_operands
,
3907 /* Apply attributes. */
3908 decl_attributes (&type
, attrs
, 0);
3913 /* Decode a declarator in an ordinary declaration or data definition.
3914 This is called as soon as the type information and variable name
3915 have been parsed, before parsing the initializer if any.
3916 Here we create the ..._DECL node, fill in its type,
3917 and put it on the list of decls for the current context.
3918 The ..._DECL node is returned as the value.
3920 Exception: for arrays where the length is not specified,
3921 the type is left null, to be filled in by `finish_decl'.
3923 Function definitions do not come here; they go to start_function
3924 instead. However, external and forward declarations of functions
3925 do go through here. Structure field declarations are done by
3926 grokfield and not through here. */
3929 start_decl (struct c_declarator
*declarator
, struct c_declspecs
*declspecs
,
3930 bool initialized
, tree attributes
)
3934 tree expr
= NULL_TREE
;
3935 enum deprecated_states deprecated_state
= DEPRECATED_NORMAL
;
3937 /* An object declared as __attribute__((deprecated)) suppresses
3938 warnings of uses of other deprecated items. */
3939 if (lookup_attribute ("deprecated", attributes
))
3940 deprecated_state
= DEPRECATED_SUPPRESS
;
3942 decl
= grokdeclarator (declarator
, declspecs
,
3943 NORMAL
, initialized
, NULL
, &attributes
, &expr
, NULL
,
3951 if (TREE_CODE (decl
) != FUNCTION_DECL
&& MAIN_NAME_P (DECL_NAME (decl
)))
3952 warning (OPT_Wmain
, "%q+D is usually a function", decl
);
3955 /* Is it valid for this decl to have an initializer at all?
3956 If not, set INITIALIZED to zero, which will indirectly
3957 tell 'finish_decl' to ignore the initializer once it is parsed. */
3958 switch (TREE_CODE (decl
))
3961 error ("typedef %qD is initialized (use __typeof__ instead)", decl
);
3966 error ("function %qD is initialized like a variable", decl
);
3971 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3972 error ("parameter %qD is initialized", decl
);
3977 /* Don't allow initializations for incomplete types except for
3978 arrays which might be completed by the initialization. */
3980 /* This can happen if the array size is an undefined macro.
3981 We already gave a warning, so we don't need another one. */
3982 if (TREE_TYPE (decl
) == error_mark_node
)
3984 else if (COMPLETE_TYPE_P (TREE_TYPE (decl
)))
3986 /* A complete type is ok if size is fixed. */
3988 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl
))) != INTEGER_CST
3989 || C_DECL_VARIABLE_SIZE (decl
))
3991 error ("variable-sized object may not be initialized");
3995 else if (TREE_CODE (TREE_TYPE (decl
)) != ARRAY_TYPE
)
3997 error ("variable %qD has initializer but incomplete type", decl
);
4000 else if (C_DECL_VARIABLE_SIZE (decl
))
4002 /* Although C99 is unclear about whether incomplete arrays
4003 of VLAs themselves count as VLAs, it does not make
4004 sense to permit them to be initialized given that
4005 ordinary VLAs may not be initialized. */
4006 error ("variable-sized object may not be initialized");
4013 if (current_scope
== file_scope
)
4014 TREE_STATIC (decl
) = 1;
4016 /* Tell 'pushdecl' this is an initialized decl
4017 even though we don't yet have the initializer expression.
4018 Also tell 'finish_decl' it may store the real initializer. */
4019 DECL_INITIAL (decl
) = error_mark_node
;
4022 /* If this is a function declaration, write a record describing it to the
4023 prototypes file (if requested). */
4025 if (TREE_CODE (decl
) == FUNCTION_DECL
)
4026 gen_aux_info_record (decl
, 0, 0, prototype_p (TREE_TYPE (decl
)));
4028 /* ANSI specifies that a tentative definition which is not merged with
4029 a non-tentative definition behaves exactly like a definition with an
4030 initializer equal to zero. (Section 3.7.2)
4032 -fno-common gives strict ANSI behavior, though this tends to break
4033 a large body of code that grew up without this rule.
4035 Thread-local variables are never common, since there's no entrenched
4036 body of code to break, and it allows more efficient variable references
4037 in the presence of dynamic linking. */
4039 if (TREE_CODE (decl
) == VAR_DECL
4041 && TREE_PUBLIC (decl
)
4042 && !DECL_THREAD_LOCAL_P (decl
)
4044 DECL_COMMON (decl
) = 1;
4046 /* Set attributes here so if duplicate decl, will have proper attributes. */
4047 decl_attributes (&decl
, attributes
, 0);
4049 /* Handle gnu_inline attribute. */
4050 if (declspecs
->inline_p
4051 && !flag_gnu89_inline
4052 && TREE_CODE (decl
) == FUNCTION_DECL
4053 && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl
))
4054 || current_function_decl
))
4056 if (declspecs
->storage_class
== csc_auto
&& current_scope
!= file_scope
)
4058 else if (declspecs
->storage_class
!= csc_static
)
4059 DECL_EXTERNAL (decl
) = !DECL_EXTERNAL (decl
);
4062 if (TREE_CODE (decl
) == FUNCTION_DECL
4063 && targetm
.calls
.promote_prototypes (TREE_TYPE (decl
)))
4065 struct c_declarator
*ce
= declarator
;
4067 if (ce
->kind
== cdk_pointer
)
4068 ce
= declarator
->declarator
;
4069 if (ce
->kind
== cdk_function
)
4071 tree args
= ce
->u
.arg_info
->parms
;
4072 for (; args
; args
= DECL_CHAIN (args
))
4074 tree type
= TREE_TYPE (args
);
4075 if (type
&& INTEGRAL_TYPE_P (type
)
4076 && TYPE_PRECISION (type
) < TYPE_PRECISION (integer_type_node
))
4077 DECL_ARG_TYPE (args
) = integer_type_node
;
4082 if (TREE_CODE (decl
) == FUNCTION_DECL
4083 && DECL_DECLARED_INLINE_P (decl
)
4084 && DECL_UNINLINABLE (decl
)
4085 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl
)))
4086 warning (OPT_Wattributes
, "inline function %q+D given attribute noinline",
4089 /* C99 6.7.4p3: An inline definition of a function with external
4090 linkage shall not contain a definition of a modifiable object
4091 with static storage duration... */
4092 if (TREE_CODE (decl
) == VAR_DECL
4093 && current_scope
!= file_scope
4094 && TREE_STATIC (decl
)
4095 && !TREE_READONLY (decl
)
4096 && DECL_DECLARED_INLINE_P (current_function_decl
)
4097 && DECL_EXTERNAL (current_function_decl
))
4098 record_inline_static (input_location
, current_function_decl
,
4099 decl
, csi_modifiable
);
4101 if (c_dialect_objc ()
4102 && (TREE_CODE (decl
) == VAR_DECL
4103 || TREE_CODE (decl
) == FUNCTION_DECL
))
4104 objc_check_global_decl (decl
);
4106 /* Add this decl to the current scope.
4107 TEM may equal DECL or it may be a previous decl of the same name. */
4108 tem
= pushdecl (decl
);
4110 if (initialized
&& DECL_EXTERNAL (tem
))
4112 DECL_EXTERNAL (tem
) = 0;
4113 TREE_STATIC (tem
) = 1;
4119 /* Subroutine of finish_decl. TYPE is the type of an uninitialized object
4120 DECL or the non-array element type if DECL is an uninitialized array.
4121 If that type has a const member, diagnose this. */
4124 diagnose_uninitialized_cst_member (tree decl
, tree type
)
4127 for (field
= TYPE_FIELDS (type
); field
; field
= TREE_CHAIN (field
))
4130 if (TREE_CODE (field
) != FIELD_DECL
)
4132 field_type
= strip_array_types (TREE_TYPE (field
));
4134 if (TYPE_QUALS (field_type
) & TYPE_QUAL_CONST
)
4136 warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wc___compat
,
4137 "uninitialized const member in %qT is invalid in C++",
4138 strip_array_types (TREE_TYPE (decl
)));
4139 inform (DECL_SOURCE_LOCATION (field
), "%qD should be initialized", field
);
4142 if (TREE_CODE (field_type
) == RECORD_TYPE
4143 || TREE_CODE (field_type
) == UNION_TYPE
)
4144 diagnose_uninitialized_cst_member (decl
, field_type
);
4148 /* Finish processing of a declaration;
4149 install its initial value.
4150 If ORIGTYPE is not NULL_TREE, it is the original type of INIT.
4151 If the length of an array type is not known before,
4152 it must be determined now, from the initial value, or it is an error.
4154 INIT_LOC is the location of the initial value. */
4157 finish_decl (tree decl
, location_t init_loc
, tree init
,
4158 tree origtype
, tree asmspec_tree
)
4161 bool was_incomplete
= (DECL_SIZE (decl
) == 0);
4162 const char *asmspec
= 0;
4164 /* If a name was specified, get the string. */
4165 if ((TREE_CODE (decl
) == FUNCTION_DECL
|| TREE_CODE (decl
) == VAR_DECL
)
4166 && DECL_FILE_SCOPE_P (decl
))
4167 asmspec_tree
= maybe_apply_renaming_pragma (decl
, asmspec_tree
);
4169 asmspec
= TREE_STRING_POINTER (asmspec_tree
);
4171 if (TREE_CODE (decl
) == VAR_DECL
4172 && TREE_STATIC (decl
)
4173 && global_bindings_p ())
4174 /* So decl is a global variable. Record the types it uses
4175 so that we can decide later to emit debug info for them. */
4176 record_types_used_by_current_var_decl (decl
);
4178 /* If `start_decl' didn't like having an initialization, ignore it now. */
4179 if (init
!= 0 && DECL_INITIAL (decl
) == 0)
4182 /* Don't crash if parm is initialized. */
4183 if (TREE_CODE (decl
) == PARM_DECL
)
4187 store_init_value (init_loc
, decl
, init
, origtype
);
4189 if (c_dialect_objc () && (TREE_CODE (decl
) == VAR_DECL
4190 || TREE_CODE (decl
) == FUNCTION_DECL
4191 || TREE_CODE (decl
) == FIELD_DECL
))
4192 objc_check_decl (decl
);
4194 type
= TREE_TYPE (decl
);
4196 /* Deduce size of array from initialization, if not already known. */
4197 if (TREE_CODE (type
) == ARRAY_TYPE
4198 && TYPE_DOMAIN (type
) == 0
4199 && TREE_CODE (decl
) != TYPE_DECL
)
4202 = (TREE_STATIC (decl
)
4203 /* Even if pedantic, an external linkage array
4204 may have incomplete type at first. */
4205 ? pedantic
&& !TREE_PUBLIC (decl
)
4206 : !DECL_EXTERNAL (decl
));
4208 = complete_array_type (&TREE_TYPE (decl
), DECL_INITIAL (decl
),
4211 /* Get the completed type made by complete_array_type. */
4212 type
= TREE_TYPE (decl
);
4217 error ("initializer fails to determine size of %q+D", decl
);
4222 error ("array size missing in %q+D", decl
);
4223 /* If a `static' var's size isn't known,
4224 make it extern as well as static, so it does not get
4226 If it is not `static', then do not mark extern;
4227 finish_incomplete_decl will give it a default size
4228 and it will get allocated. */
4229 else if (!pedantic
&& TREE_STATIC (decl
) && !TREE_PUBLIC (decl
))
4230 DECL_EXTERNAL (decl
) = 1;
4234 error ("zero or negative size array %q+D", decl
);
4238 /* For global variables, update the copy of the type that
4239 exists in the binding. */
4240 if (TREE_PUBLIC (decl
))
4242 struct c_binding
*b_ext
= I_SYMBOL_BINDING (DECL_NAME (decl
));
4243 while (b_ext
&& !B_IN_EXTERNAL_SCOPE (b_ext
))
4244 b_ext
= b_ext
->shadowed
;
4247 if (b_ext
->u
.type
&& comptypes (b_ext
->u
.type
, type
))
4248 b_ext
->u
.type
= composite_type (b_ext
->u
.type
, type
);
4250 b_ext
->u
.type
= type
;
4259 if (DECL_INITIAL (decl
))
4260 TREE_TYPE (DECL_INITIAL (decl
)) = type
;
4262 layout_decl (decl
, 0);
4265 if (TREE_CODE (decl
) == VAR_DECL
)
4267 if (init
&& TREE_CODE (init
) == CONSTRUCTOR
)
4268 add_flexible_array_elts_to_size (decl
, init
);
4270 if (DECL_SIZE (decl
) == 0 && TREE_TYPE (decl
) != error_mark_node
4271 && COMPLETE_TYPE_P (TREE_TYPE (decl
)))
4272 layout_decl (decl
, 0);
4274 if (DECL_SIZE (decl
) == 0
4275 /* Don't give an error if we already gave one earlier. */
4276 && TREE_TYPE (decl
) != error_mark_node
4277 && (TREE_STATIC (decl
)
4278 /* A static variable with an incomplete type
4279 is an error if it is initialized.
4280 Also if it is not file scope.
4281 Otherwise, let it through, but if it is not `extern'
4282 then it may cause an error message later. */
4283 ? (DECL_INITIAL (decl
) != 0
4284 || !DECL_FILE_SCOPE_P (decl
))
4285 /* An automatic variable with an incomplete type
4287 : !DECL_EXTERNAL (decl
)))
4289 error ("storage size of %q+D isn%'t known", decl
);
4290 TREE_TYPE (decl
) = error_mark_node
;
4293 if ((DECL_EXTERNAL (decl
) || TREE_STATIC (decl
))
4294 && DECL_SIZE (decl
) != 0)
4296 if (TREE_CODE (DECL_SIZE (decl
)) == INTEGER_CST
)
4297 constant_expression_warning (DECL_SIZE (decl
));
4300 error ("storage size of %q+D isn%'t constant", decl
);
4301 TREE_TYPE (decl
) = error_mark_node
;
4305 if (TREE_USED (type
))
4307 TREE_USED (decl
) = 1;
4308 DECL_READ_P (decl
) = 1;
4312 /* If this is a function and an assembler name is specified, reset DECL_RTL
4313 so we can give it its new name. Also, update built_in_decls if it
4314 was a normal built-in. */
4315 if (TREE_CODE (decl
) == FUNCTION_DECL
&& asmspec
)
4317 if (DECL_BUILT_IN_CLASS (decl
) == BUILT_IN_NORMAL
)
4318 set_builtin_user_assembler_name (decl
, asmspec
);
4319 set_user_assembler_name (decl
, asmspec
);
4322 /* If #pragma weak was used, mark the decl weak now. */
4323 maybe_apply_pragma_weak (decl
);
4325 /* Output the assembler code and/or RTL code for variables and functions,
4326 unless the type is an undefined structure or union.
4327 If not, it will get done when the type is completed. */
4329 if (TREE_CODE (decl
) == VAR_DECL
|| TREE_CODE (decl
) == FUNCTION_DECL
)
4331 /* Determine the ELF visibility. */
4332 if (TREE_PUBLIC (decl
))
4333 c_determine_visibility (decl
);
4335 /* This is a no-op in c-lang.c or something real in objc-act.c. */
4336 if (c_dialect_objc ())
4337 objc_check_decl (decl
);
4341 /* If this is not a static variable, issue a warning.
4342 It doesn't make any sense to give an ASMSPEC for an
4343 ordinary, non-register local variable. Historically,
4344 GCC has accepted -- but ignored -- the ASMSPEC in
4346 if (!DECL_FILE_SCOPE_P (decl
)
4347 && TREE_CODE (decl
) == VAR_DECL
4348 && !C_DECL_REGISTER (decl
)
4349 && !TREE_STATIC (decl
))
4350 warning (0, "ignoring asm-specifier for non-static local "
4351 "variable %q+D", decl
);
4353 set_user_assembler_name (decl
, asmspec
);
4356 if (DECL_FILE_SCOPE_P (decl
))
4358 if (DECL_INITIAL (decl
) == NULL_TREE
4359 || DECL_INITIAL (decl
) == error_mark_node
)
4360 /* Don't output anything
4361 when a tentative file-scope definition is seen.
4362 But at end of compilation, do output code for them. */
4363 DECL_DEFER_OUTPUT (decl
) = 1;
4364 rest_of_decl_compilation (decl
, true, 0);
4368 /* In conjunction with an ASMSPEC, the `register'
4369 keyword indicates that we should place the variable
4370 in a particular register. */
4371 if (asmspec
&& C_DECL_REGISTER (decl
))
4373 DECL_HARD_REGISTER (decl
) = 1;
4374 /* This cannot be done for a structure with volatile
4375 fields, on which DECL_REGISTER will have been
4377 if (!DECL_REGISTER (decl
))
4378 error ("cannot put object with volatile field into register");
4381 if (TREE_CODE (decl
) != FUNCTION_DECL
)
4383 /* If we're building a variable sized type, and we might be
4384 reachable other than via the top of the current binding
4385 level, then create a new BIND_EXPR so that we deallocate
4386 the object at the right time. */
4387 /* Note that DECL_SIZE can be null due to errors. */
4388 if (DECL_SIZE (decl
)
4389 && !TREE_CONSTANT (DECL_SIZE (decl
))
4390 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list
))
4393 bind
= build3 (BIND_EXPR
, void_type_node
, NULL
, NULL
, NULL
);
4394 TREE_SIDE_EFFECTS (bind
) = 1;
4396 BIND_EXPR_BODY (bind
) = push_stmt_list ();
4398 add_stmt (build_stmt (DECL_SOURCE_LOCATION (decl
),
4404 if (!DECL_FILE_SCOPE_P (decl
))
4406 /* Recompute the RTL of a local array now
4407 if it used to be an incomplete type. */
4409 && !TREE_STATIC (decl
) && !DECL_EXTERNAL (decl
))
4411 /* If we used it already as memory, it must stay in memory. */
4412 TREE_ADDRESSABLE (decl
) = TREE_USED (decl
);
4413 /* If it's still incomplete now, no init will save it. */
4414 if (DECL_SIZE (decl
) == 0)
4415 DECL_INITIAL (decl
) = 0;
4420 if (TREE_CODE (decl
) == TYPE_DECL
)
4422 if (!DECL_FILE_SCOPE_P (decl
)
4423 && variably_modified_type_p (TREE_TYPE (decl
), NULL_TREE
))
4424 add_stmt (build_stmt (DECL_SOURCE_LOCATION (decl
), DECL_EXPR
, decl
));
4426 rest_of_decl_compilation (decl
, DECL_FILE_SCOPE_P (decl
), 0);
4429 /* Install a cleanup (aka destructor) if one was given. */
4430 if (TREE_CODE (decl
) == VAR_DECL
&& !TREE_STATIC (decl
))
4432 tree attr
= lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl
));
4435 tree cleanup_id
= TREE_VALUE (TREE_VALUE (attr
));
4436 tree cleanup_decl
= lookup_name (cleanup_id
);
4440 /* Build "cleanup(&decl)" for the destructor. */
4441 cleanup
= build_unary_op (input_location
, ADDR_EXPR
, decl
, 0);
4442 vec
= VEC_alloc (tree
, gc
, 1);
4443 VEC_quick_push (tree
, vec
, cleanup
);
4444 cleanup
= build_function_call_vec (DECL_SOURCE_LOCATION (decl
),
4445 cleanup_decl
, vec
, NULL
);
4446 VEC_free (tree
, gc
, vec
);
4448 /* Don't warn about decl unused; the cleanup uses it. */
4449 TREE_USED (decl
) = 1;
4450 TREE_USED (cleanup_decl
) = 1;
4451 DECL_READ_P (decl
) = 1;
4453 push_cleanup (decl
, cleanup
, false);
4458 && TREE_CODE (decl
) == VAR_DECL
4459 && !DECL_EXTERNAL (decl
)
4460 && DECL_INITIAL (decl
) == NULL_TREE
)
4462 type
= strip_array_types (type
);
4463 if (TREE_READONLY (decl
))
4464 warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wc___compat
,
4465 "uninitialized const %qD is invalid in C++", decl
);
4466 else if ((TREE_CODE (type
) == RECORD_TYPE
4467 || TREE_CODE (type
) == UNION_TYPE
)
4468 && C_TYPE_FIELDS_READONLY (type
))
4469 diagnose_uninitialized_cst_member (decl
, type
);
4473 /* Given a parsed parameter declaration, decode it into a PARM_DECL.
4474 EXPR is NULL or a pointer to an expression that needs to be
4475 evaluated for the side effects of array size expressions in the
4479 grokparm (const struct c_parm
*parm
, tree
*expr
)
4481 tree attrs
= parm
->attrs
;
4482 tree decl
= grokdeclarator (parm
->declarator
, parm
->specs
, PARM
, false,
4483 NULL
, &attrs
, expr
, NULL
, DEPRECATED_NORMAL
);
4485 decl_attributes (&decl
, attrs
, 0);
4490 /* Given a parsed parameter declaration, decode it into a PARM_DECL
4491 and push that on the current scope. EXPR is a pointer to an
4492 expression that needs to be evaluated for the side effects of array
4493 size expressions in the parameters. */
4496 push_parm_decl (const struct c_parm
*parm
, tree
*expr
)
4498 tree attrs
= parm
->attrs
;
4501 decl
= grokdeclarator (parm
->declarator
, parm
->specs
, PARM
, false, NULL
,
4502 &attrs
, expr
, NULL
, DEPRECATED_NORMAL
);
4503 decl_attributes (&decl
, attrs
, 0);
4505 decl
= pushdecl (decl
);
4507 finish_decl (decl
, input_location
, NULL_TREE
, NULL_TREE
, NULL_TREE
);
4510 /* Mark all the parameter declarations to date as forward decls.
4511 Also diagnose use of this extension. */
4514 mark_forward_parm_decls (void)
4516 struct c_binding
*b
;
4518 if (pedantic
&& !current_scope
->warned_forward_parm_decls
)
4520 pedwarn (input_location
, OPT_pedantic
,
4521 "ISO C forbids forward parameter declarations");
4522 current_scope
->warned_forward_parm_decls
= true;
4525 for (b
= current_scope
->bindings
; b
; b
= b
->prev
)
4526 if (TREE_CODE (b
->decl
) == PARM_DECL
)
4527 TREE_ASM_WRITTEN (b
->decl
) = 1;
4530 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
4531 literal, which may be an incomplete array type completed by the
4532 initializer; INIT is a CONSTRUCTOR at LOC that initializes the compound
4533 literal. NON_CONST is true if the initializers contain something
4534 that cannot occur in a constant expression. */
4537 build_compound_literal (location_t loc
, tree type
, tree init
, bool non_const
)
4539 /* We do not use start_decl here because we have a type, not a declarator;
4540 and do not use finish_decl because the decl should be stored inside
4541 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_EXPR. */
4546 if (type
== error_mark_node
4547 || init
== error_mark_node
)
4548 return error_mark_node
;
4550 decl
= build_decl (loc
, VAR_DECL
, NULL_TREE
, type
);
4551 DECL_EXTERNAL (decl
) = 0;
4552 TREE_PUBLIC (decl
) = 0;
4553 TREE_STATIC (decl
) = (current_scope
== file_scope
);
4554 DECL_CONTEXT (decl
) = current_function_decl
;
4555 TREE_USED (decl
) = 1;
4556 DECL_READ_P (decl
) = 1;
4557 TREE_TYPE (decl
) = type
;
4558 TREE_READONLY (decl
) = TYPE_READONLY (type
);
4559 store_init_value (loc
, decl
, init
, NULL_TREE
);
4561 if (TREE_CODE (type
) == ARRAY_TYPE
&& !COMPLETE_TYPE_P (type
))
4563 int failure
= complete_array_type (&TREE_TYPE (decl
),
4564 DECL_INITIAL (decl
), true);
4565 gcc_assert (!failure
);
4567 type
= TREE_TYPE (decl
);
4568 TREE_TYPE (DECL_INITIAL (decl
)) = type
;
4571 if (type
== error_mark_node
|| !COMPLETE_TYPE_P (type
))
4572 return error_mark_node
;
4574 stmt
= build_stmt (DECL_SOURCE_LOCATION (decl
), DECL_EXPR
, decl
);
4575 complit
= build1 (COMPOUND_LITERAL_EXPR
, type
, stmt
);
4576 TREE_SIDE_EFFECTS (complit
) = 1;
4578 layout_decl (decl
, 0);
4580 if (TREE_STATIC (decl
))
4582 /* This decl needs a name for the assembler output. */
4583 set_compound_literal_name (decl
);
4584 DECL_DEFER_OUTPUT (decl
) = 1;
4585 DECL_COMDAT (decl
) = 1;
4586 DECL_ARTIFICIAL (decl
) = 1;
4587 DECL_IGNORED_P (decl
) = 1;
4589 rest_of_decl_compilation (decl
, 1, 0);
4594 complit
= build2 (C_MAYBE_CONST_EXPR
, type
, NULL
, complit
);
4595 C_MAYBE_CONST_EXPR_NON_CONST (complit
) = 1;
4601 /* Check the type of a compound literal. Here we just check that it
4602 is valid for C++. */
4605 check_compound_literal_type (location_t loc
, struct c_type_name
*type_name
)
4608 && (type_name
->specs
->typespec_kind
== ctsk_tagdef
4609 || type_name
->specs
->typespec_kind
== ctsk_tagfirstref
))
4610 warning_at (loc
, OPT_Wc___compat
,
4611 "defining a type in a compound literal is invalid in C++");
4614 /* Determine whether TYPE is a structure with a flexible array member,
4615 or a union containing such a structure (possibly recursively). */
4618 flexible_array_type_p (tree type
)
4621 switch (TREE_CODE (type
))
4624 x
= TYPE_FIELDS (type
);
4627 while (DECL_CHAIN (x
) != NULL_TREE
)
4629 if (TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
4630 && TYPE_SIZE (TREE_TYPE (x
)) == NULL_TREE
4631 && TYPE_DOMAIN (TREE_TYPE (x
)) != NULL_TREE
4632 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x
))) == NULL_TREE
)
4636 for (x
= TYPE_FIELDS (type
); x
!= NULL_TREE
; x
= DECL_CHAIN (x
))
4638 if (flexible_array_type_p (TREE_TYPE (x
)))
4647 /* Performs sanity checks on the TYPE and WIDTH of the bit-field NAME,
4648 replacing with appropriate values if they are invalid. */
4650 check_bitfield_type_and_width (tree
*type
, tree
*width
, tree orig_name
)
4653 unsigned int max_width
;
4654 unsigned HOST_WIDE_INT w
;
4655 const char *name
= (orig_name
4656 ? identifier_to_locale (IDENTIFIER_POINTER (orig_name
))
4657 : _("<anonymous>"));
4659 /* Detect and ignore out of range field width and process valid
4661 if (!INTEGRAL_TYPE_P (TREE_TYPE (*width
)))
4663 error ("bit-field %qs width not an integer constant", name
);
4664 *width
= integer_one_node
;
4668 if (TREE_CODE (*width
) != INTEGER_CST
)
4670 *width
= c_fully_fold (*width
, false, NULL
);
4671 if (TREE_CODE (*width
) == INTEGER_CST
)
4672 pedwarn (input_location
, OPT_pedantic
,
4673 "bit-field %qs width not an integer constant expression",
4676 if (TREE_CODE (*width
) != INTEGER_CST
)
4678 error ("bit-field %qs width not an integer constant", name
);
4679 *width
= integer_one_node
;
4681 constant_expression_warning (*width
);
4682 if (tree_int_cst_sgn (*width
) < 0)
4684 error ("negative width in bit-field %qs", name
);
4685 *width
= integer_one_node
;
4687 else if (integer_zerop (*width
) && orig_name
)
4689 error ("zero width for bit-field %qs", name
);
4690 *width
= integer_one_node
;
4694 /* Detect invalid bit-field type. */
4695 if (TREE_CODE (*type
) != INTEGER_TYPE
4696 && TREE_CODE (*type
) != BOOLEAN_TYPE
4697 && TREE_CODE (*type
) != ENUMERAL_TYPE
)
4699 error ("bit-field %qs has invalid type", name
);
4700 *type
= unsigned_type_node
;
4703 type_mv
= TYPE_MAIN_VARIANT (*type
);
4704 if (!in_system_header
4705 && type_mv
!= integer_type_node
4706 && type_mv
!= unsigned_type_node
4707 && type_mv
!= boolean_type_node
)
4708 pedwarn (input_location
, OPT_pedantic
,
4709 "type of bit-field %qs is a GCC extension", name
);
4711 max_width
= TYPE_PRECISION (*type
);
4713 if (0 < compare_tree_int (*width
, max_width
))
4715 error ("width of %qs exceeds its type", name
);
4717 *width
= build_int_cst (integer_type_node
, w
);
4720 w
= tree_low_cst (*width
, 1);
4722 if (TREE_CODE (*type
) == ENUMERAL_TYPE
)
4724 struct lang_type
*lt
= TYPE_LANG_SPECIFIC (*type
);
4726 || w
< tree_int_cst_min_precision (lt
->enum_min
, TYPE_UNSIGNED (*type
))
4727 || w
< tree_int_cst_min_precision (lt
->enum_max
, TYPE_UNSIGNED (*type
)))
4728 warning (0, "%qs is narrower than values of its type", name
);
4734 /* Print warning about variable length array if necessary. */
4737 warn_variable_length_array (tree name
, tree size
)
4739 int const_size
= TREE_CONSTANT (size
);
4741 if (!flag_isoc99
&& pedantic
&& warn_vla
!= 0)
4746 pedwarn (input_location
, OPT_Wvla
,
4747 "ISO C90 forbids array %qE whose size "
4748 "can%'t be evaluated",
4751 pedwarn (input_location
, OPT_Wvla
, "ISO C90 forbids array whose size "
4752 "can%'t be evaluated");
4757 pedwarn (input_location
, OPT_Wvla
,
4758 "ISO C90 forbids variable length array %qE",
4761 pedwarn (input_location
, OPT_Wvla
, "ISO C90 forbids variable length array");
4764 else if (warn_vla
> 0)
4770 "the size of array %qE can"
4771 "%'t be evaluated", name
);
4774 "the size of array can %'t be evaluated");
4780 "variable length array %qE is used",
4784 "variable length array is used");
4789 /* Given declspecs and a declarator,
4790 determine the name and type of the object declared
4791 and construct a ..._DECL node for it.
4792 (In one case we can return a ..._TYPE node instead.
4793 For invalid input we sometimes return 0.)
4795 DECLSPECS is a c_declspecs structure for the declaration specifiers.
4797 DECL_CONTEXT says which syntactic context this declaration is in:
4798 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
4799 FUNCDEF for a function definition. Like NORMAL but a few different
4800 error messages in each case. Return value may be zero meaning
4801 this definition is too screwy to try to parse.
4802 PARM for a parameter declaration (either within a function prototype
4803 or before a function body). Make a PARM_DECL, or return void_type_node.
4804 TYPENAME if for a typename (in a cast or sizeof).
4805 Don't make a DECL node; just return the ..._TYPE node.
4806 FIELD for a struct or union field; make a FIELD_DECL.
4807 INITIALIZED is true if the decl has an initializer.
4808 WIDTH is non-NULL for bit-fields, and is a pointer to an INTEGER_CST node
4809 representing the width of the bit-field.
4810 DECL_ATTRS points to the list of attributes that should be added to this
4811 decl. Any nested attributes that belong on the decl itself will be
4813 If EXPR is not NULL, any expressions that need to be evaluated as
4814 part of evaluating variably modified types will be stored in *EXPR.
4815 If EXPR_CONST_OPERANDS is not NULL, *EXPR_CONST_OPERANDS will be
4816 set to indicate whether operands in *EXPR can be used in constant
4818 DEPRECATED_STATE is a deprecated_states value indicating whether
4819 deprecation warnings should be suppressed.
4821 In the TYPENAME case, DECLARATOR is really an absolute declarator.
4822 It may also be so in the PARM case, for a prototype where the
4823 argument type is specified but not the name.
4825 This function is where the complicated C meanings of `static'
4826 and `extern' are interpreted. */
4829 grokdeclarator (const struct c_declarator
*declarator
,
4830 struct c_declspecs
*declspecs
,
4831 enum decl_context decl_context
, bool initialized
, tree
*width
,
4832 tree
*decl_attrs
, tree
*expr
, bool *expr_const_operands
,
4833 enum deprecated_states deprecated_state
)
4835 tree type
= declspecs
->type
;
4836 bool threadp
= declspecs
->thread_p
;
4837 enum c_storage_class storage_class
= declspecs
->storage_class
;
4841 int type_quals
= TYPE_UNQUALIFIED
;
4842 tree name
= NULL_TREE
;
4843 bool funcdef_flag
= false;
4844 bool funcdef_syntax
= false;
4845 bool size_varies
= false;
4846 tree decl_attr
= declspecs
->decl_attr
;
4847 int array_ptr_quals
= TYPE_UNQUALIFIED
;
4848 tree array_ptr_attrs
= NULL_TREE
;
4849 int array_parm_static
= 0;
4850 bool array_parm_vla_unspec_p
= false;
4851 tree returned_attrs
= NULL_TREE
;
4852 bool bitfield
= width
!= NULL
;
4854 struct c_arg_info
*arg_info
= 0;
4855 addr_space_t as1
, as2
, address_space
;
4856 location_t loc
= UNKNOWN_LOCATION
;
4859 bool expr_const_operands_dummy
;
4860 enum c_declarator_kind first_non_attr_kind
;
4862 if (TREE_CODE (type
) == ERROR_MARK
)
4863 return error_mark_node
;
4866 if (expr_const_operands
== NULL
)
4867 expr_const_operands
= &expr_const_operands_dummy
;
4869 *expr
= declspecs
->expr
;
4870 *expr_const_operands
= declspecs
->expr_const_operands
;
4872 if (decl_context
== FUNCDEF
)
4873 funcdef_flag
= true, decl_context
= NORMAL
;
4875 /* Look inside a declarator for the name being declared
4876 and get it as an IDENTIFIER_NODE, for an error message. */
4878 const struct c_declarator
*decl
= declarator
;
4880 first_non_attr_kind
= cdk_attrs
;
4890 funcdef_syntax
= (decl
->kind
== cdk_function
);
4891 decl
= decl
->declarator
;
4892 if (first_non_attr_kind
== cdk_attrs
)
4893 first_non_attr_kind
= decl
->kind
;
4897 decl
= decl
->declarator
;
4904 if (first_non_attr_kind
== cdk_attrs
)
4905 first_non_attr_kind
= decl
->kind
;
4914 gcc_assert (decl_context
== PARM
4915 || decl_context
== TYPENAME
4916 || (decl_context
== FIELD
4917 && declarator
->kind
== cdk_id
));
4918 gcc_assert (!initialized
);
4922 /* A function definition's declarator must have the form of
4923 a function declarator. */
4925 if (funcdef_flag
&& !funcdef_syntax
)
4928 /* If this looks like a function definition, make it one,
4929 even if it occurs where parms are expected.
4930 Then store_parm_decls will reject it and not use it as a parm. */
4931 if (decl_context
== NORMAL
&& !funcdef_flag
&& current_scope
->parm_flag
)
4932 decl_context
= PARM
;
4934 if (declspecs
->deprecated_p
&& deprecated_state
!= DEPRECATED_SUPPRESS
)
4935 warn_deprecated_use (declspecs
->type
, declspecs
->decl_attr
);
4937 if ((decl_context
== NORMAL
|| decl_context
== FIELD
)
4938 && current_scope
== file_scope
4939 && variably_modified_type_p (type
, NULL_TREE
))
4942 error_at (loc
, "variably modified %qE at file scope", name
);
4944 error_at (loc
, "variably modified field at file scope");
4945 type
= integer_type_node
;
4948 size_varies
= C_TYPE_VARIABLE_SIZE (type
) != 0;
4950 /* Diagnose defaulting to "int". */
4952 if (declspecs
->default_int_p
&& !in_system_header
)
4954 /* Issue a warning if this is an ISO C 99 program or if
4955 -Wreturn-type and this is a function, or if -Wimplicit;
4956 prefer the former warning since it is more explicit. */
4957 if ((warn_implicit_int
|| warn_return_type
|| flag_isoc99
)
4959 warn_about_return_type
= 1;
4963 pedwarn_c99 (loc
, flag_isoc99
? 0 : OPT_Wimplicit_int
,
4964 "type defaults to %<int%> in declaration of %qE",
4967 pedwarn_c99 (input_location
, flag_isoc99
? 0 : OPT_Wimplicit_int
,
4968 "type defaults to %<int%> in type name");
4972 /* Adjust the type if a bit-field is being declared,
4973 -funsigned-bitfields applied and the type is not explicitly
4975 if (bitfield
&& !flag_signed_bitfields
&& !declspecs
->explicit_signed_p
4976 && TREE_CODE (type
) == INTEGER_TYPE
)
4977 type
= unsigned_type_for (type
);
4979 /* Figure out the type qualifiers for the declaration. There are
4980 two ways a declaration can become qualified. One is something
4981 like `const int i' where the `const' is explicit. Another is
4982 something like `typedef const int CI; CI i' where the type of the
4983 declaration contains the `const'. A third possibility is that
4984 there is a type qualifier on the element type of a typedefed
4985 array type, in which case we should extract that qualifier so
4986 that c_apply_type_quals_to_decl receives the full list of
4987 qualifiers to work with (C90 is not entirely clear about whether
4988 duplicate qualifiers should be diagnosed in this case, but it
4989 seems most appropriate to do so). */
4990 element_type
= strip_array_types (type
);
4991 constp
= declspecs
->const_p
+ TYPE_READONLY (element_type
);
4992 restrictp
= declspecs
->restrict_p
+ TYPE_RESTRICT (element_type
);
4993 volatilep
= declspecs
->volatile_p
+ TYPE_VOLATILE (element_type
);
4994 as1
= declspecs
->address_space
;
4995 as2
= TYPE_ADDR_SPACE (element_type
);
4996 address_space
= ADDR_SPACE_GENERIC_P (as1
)? as2
: as1
;
4998 if (pedantic
&& !flag_isoc99
)
5001 pedwarn (loc
, OPT_pedantic
, "duplicate %<const%>");
5003 pedwarn (loc
, OPT_pedantic
, "duplicate %<restrict%>");
5005 pedwarn (loc
, OPT_pedantic
, "duplicate %<volatile%>");
5008 if (!ADDR_SPACE_GENERIC_P (as1
) && !ADDR_SPACE_GENERIC_P (as2
) && as1
!= as2
)
5009 error_at (loc
, "conflicting named address spaces (%s vs %s)",
5010 c_addr_space_name (as1
), c_addr_space_name (as2
));
5012 if ((TREE_CODE (type
) == ARRAY_TYPE
5013 || first_non_attr_kind
== cdk_array
)
5014 && TYPE_QUALS (element_type
))
5015 type
= TYPE_MAIN_VARIANT (type
);
5016 type_quals
= ((constp
? TYPE_QUAL_CONST
: 0)
5017 | (restrictp
? TYPE_QUAL_RESTRICT
: 0)
5018 | (volatilep
? TYPE_QUAL_VOLATILE
: 0)
5019 | ENCODE_QUAL_ADDR_SPACE (address_space
));
5021 /* Warn about storage classes that are invalid for certain
5022 kinds of declarations (parameters, typenames, etc.). */
5026 || storage_class
== csc_auto
5027 || storage_class
== csc_register
5028 || storage_class
== csc_typedef
))
5030 if (storage_class
== csc_auto
)
5032 (current_scope
== file_scope
) ? 0 : OPT_pedantic
,
5033 "function definition declared %<auto%>");
5034 if (storage_class
== csc_register
)
5035 error_at (loc
, "function definition declared %<register%>");
5036 if (storage_class
== csc_typedef
)
5037 error_at (loc
, "function definition declared %<typedef%>");
5039 error_at (loc
, "function definition declared %<__thread%>");
5041 if (storage_class
== csc_auto
5042 || storage_class
== csc_register
5043 || storage_class
== csc_typedef
)
5044 storage_class
= csc_none
;
5046 else if (decl_context
!= NORMAL
&& (storage_class
!= csc_none
|| threadp
))
5048 if (decl_context
== PARM
&& storage_class
== csc_register
)
5052 switch (decl_context
)
5056 error_at (loc
, "storage class specified for structure "
5059 error_at (loc
, "storage class specified for structure field");
5063 error_at (loc
, "storage class specified for parameter %qE",
5066 error_at (loc
, "storage class specified for unnamed parameter");
5069 error_at (loc
, "storage class specified for typename");
5072 storage_class
= csc_none
;
5076 else if (storage_class
== csc_extern
5080 /* 'extern' with initialization is invalid if not at file scope. */
5081 if (current_scope
== file_scope
)
5083 /* It is fine to have 'extern const' when compiling at C
5084 and C++ intersection. */
5085 if (!(warn_cxx_compat
&& constp
))
5086 warning_at (loc
, 0, "%qE initialized and declared %<extern%>",
5090 error_at (loc
, "%qE has both %<extern%> and initializer", name
);
5092 else if (current_scope
== file_scope
)
5094 if (storage_class
== csc_auto
)
5095 error_at (loc
, "file-scope declaration of %qE specifies %<auto%>",
5097 if (pedantic
&& storage_class
== csc_register
)
5098 pedwarn (input_location
, OPT_pedantic
,
5099 "file-scope declaration of %qE specifies %<register%>", name
);
5103 if (storage_class
== csc_extern
&& funcdef_flag
)
5104 error_at (loc
, "nested function %qE declared %<extern%>", name
);
5105 else if (threadp
&& storage_class
== csc_none
)
5107 error_at (loc
, "function-scope %qE implicitly auto and declared "
5114 /* Now figure out the structure of the declarator proper.
5115 Descend through it, creating more complex types, until we reach
5116 the declared identifier (or NULL_TREE, in an absolute declarator).
5117 At each stage we maintain an unqualified version of the type
5118 together with any qualifiers that should be applied to it with
5119 c_build_qualified_type; this way, array types including
5120 multidimensional array types are first built up in unqualified
5121 form and then the qualified form is created with
5122 TYPE_MAIN_VARIANT pointing to the unqualified form. */
5124 while (declarator
&& declarator
->kind
!= cdk_id
)
5126 if (type
== error_mark_node
)
5128 declarator
= declarator
->declarator
;
5132 /* Each level of DECLARATOR is either a cdk_array (for ...[..]),
5133 a cdk_pointer (for *...),
5134 a cdk_function (for ...(...)),
5135 a cdk_attrs (for nested attributes),
5136 or a cdk_id (for the name being declared
5137 or the place in an absolute declarator
5138 where the name was omitted).
5139 For the last case, we have just exited the loop.
5141 At this point, TYPE is the type of elements of an array,
5142 or for a function to return, or for a pointer to point to.
5143 After this sequence of ifs, TYPE is the type of the
5144 array or function or pointer, and DECLARATOR has had its
5145 outermost layer removed. */
5147 if (array_ptr_quals
!= TYPE_UNQUALIFIED
5148 || array_ptr_attrs
!= NULL_TREE
5149 || array_parm_static
)
5151 /* Only the innermost declarator (making a parameter be of
5152 array type which is converted to pointer type)
5153 may have static or type qualifiers. */
5154 error_at (loc
, "static or type qualifiers in non-parameter array declarator");
5155 array_ptr_quals
= TYPE_UNQUALIFIED
;
5156 array_ptr_attrs
= NULL_TREE
;
5157 array_parm_static
= 0;
5160 switch (declarator
->kind
)
5164 /* A declarator with embedded attributes. */
5165 tree attrs
= declarator
->u
.attrs
;
5166 const struct c_declarator
*inner_decl
;
5168 declarator
= declarator
->declarator
;
5169 inner_decl
= declarator
;
5170 while (inner_decl
->kind
== cdk_attrs
)
5171 inner_decl
= inner_decl
->declarator
;
5172 if (inner_decl
->kind
== cdk_id
)
5173 attr_flags
|= (int) ATTR_FLAG_DECL_NEXT
;
5174 else if (inner_decl
->kind
== cdk_function
)
5175 attr_flags
|= (int) ATTR_FLAG_FUNCTION_NEXT
;
5176 else if (inner_decl
->kind
== cdk_array
)
5177 attr_flags
|= (int) ATTR_FLAG_ARRAY_NEXT
;
5178 returned_attrs
= decl_attributes (&type
,
5179 chainon (returned_attrs
, attrs
),
5185 tree itype
= NULL_TREE
;
5186 tree size
= declarator
->u
.array
.dimen
;
5187 /* The index is a signed object `sizetype' bits wide. */
5188 tree index_type
= c_common_signed_type (sizetype
);
5190 array_ptr_quals
= declarator
->u
.array
.quals
;
5191 array_ptr_attrs
= declarator
->u
.array
.attrs
;
5192 array_parm_static
= declarator
->u
.array
.static_p
;
5193 array_parm_vla_unspec_p
= declarator
->u
.array
.vla_unspec_p
;
5195 declarator
= declarator
->declarator
;
5197 /* Check for some types that there cannot be arrays of. */
5199 if (VOID_TYPE_P (type
))
5202 error_at (loc
, "declaration of %qE as array of voids", name
);
5204 error_at (loc
, "declaration of type name as array of voids");
5205 type
= error_mark_node
;
5208 if (TREE_CODE (type
) == FUNCTION_TYPE
)
5211 error_at (loc
, "declaration of %qE as array of functions",
5214 error_at (loc
, "declaration of type name as array of "
5216 type
= error_mark_node
;
5219 if (pedantic
&& !in_system_header
&& flexible_array_type_p (type
))
5220 pedwarn (loc
, OPT_pedantic
,
5221 "invalid use of structure with flexible array member");
5223 if (size
== error_mark_node
)
5224 type
= error_mark_node
;
5226 if (type
== error_mark_node
)
5229 /* If size was specified, set ITYPE to a range-type for
5230 that size. Otherwise, ITYPE remains null. finish_decl
5231 may figure it out from an initial value. */
5235 bool size_maybe_const
= true;
5236 bool size_int_const
= (TREE_CODE (size
) == INTEGER_CST
5237 && !TREE_OVERFLOW (size
));
5238 bool this_size_varies
= false;
5240 /* Strip NON_LVALUE_EXPRs since we aren't using as an
5242 STRIP_TYPE_NOPS (size
);
5244 if (!INTEGRAL_TYPE_P (TREE_TYPE (size
)))
5247 error_at (loc
, "size of array %qE has non-integer type",
5251 "size of unnamed array has non-integer type");
5252 size
= integer_one_node
;
5255 size
= c_fully_fold (size
, false, &size_maybe_const
);
5257 if (pedantic
&& size_maybe_const
&& integer_zerop (size
))
5260 pedwarn (loc
, OPT_pedantic
,
5261 "ISO C forbids zero-size array %qE", name
);
5263 pedwarn (loc
, OPT_pedantic
,
5264 "ISO C forbids zero-size array");
5267 if (TREE_CODE (size
) == INTEGER_CST
&& size_maybe_const
)
5269 constant_expression_warning (size
);
5270 if (tree_int_cst_sgn (size
) < 0)
5273 error_at (loc
, "size of array %qE is negative", name
);
5275 error_at (loc
, "size of unnamed array is negative");
5276 size
= integer_one_node
;
5278 /* Handle a size folded to an integer constant but
5279 not an integer constant expression. */
5280 if (!size_int_const
)
5282 /* If this is a file scope declaration of an
5283 ordinary identifier, this is invalid code;
5284 diagnosing it here and not subsequently
5285 treating the type as variable-length avoids
5286 more confusing diagnostics later. */
5287 if ((decl_context
== NORMAL
|| decl_context
== FIELD
)
5288 && current_scope
== file_scope
)
5289 pedwarn (input_location
, 0,
5290 "variably modified %qE at file scope",
5293 this_size_varies
= size_varies
= true;
5294 warn_variable_length_array (name
, size
);
5297 else if ((decl_context
== NORMAL
|| decl_context
== FIELD
)
5298 && current_scope
== file_scope
)
5300 error_at (loc
, "variably modified %qE at file scope", name
);
5301 size
= integer_one_node
;
5305 /* Make sure the array size remains visibly
5306 nonconstant even if it is (eg) a const variable
5307 with known value. */
5308 this_size_varies
= size_varies
= true;
5309 warn_variable_length_array (name
, size
);
5312 if (integer_zerop (size
) && !this_size_varies
)
5314 /* A zero-length array cannot be represented with
5315 an unsigned index type, which is what we'll
5316 get with build_index_type. Create an
5317 open-ended range instead. */
5318 itype
= build_range_type (sizetype
, size
, NULL_TREE
);
5322 /* Arrange for the SAVE_EXPR on the inside of the
5323 MINUS_EXPR, which allows the -1 to get folded
5324 with the +1 that happens when building TYPE_SIZE. */
5326 size
= save_expr (size
);
5327 if (this_size_varies
&& TREE_CODE (size
) == INTEGER_CST
)
5328 size
= build2 (COMPOUND_EXPR
, TREE_TYPE (size
),
5329 integer_zero_node
, size
);
5331 /* Compute the maximum valid index, that is, size
5332 - 1. Do the calculation in index_type, so that
5333 if it is a variable the computations will be
5334 done in the proper mode. */
5335 itype
= fold_build2_loc (loc
, MINUS_EXPR
, index_type
,
5336 convert (index_type
, size
),
5337 convert (index_type
,
5340 /* The above overflows when size does not fit
5342 ??? While a size of INT_MAX+1 technically shouldn't
5343 cause an overflow (because we subtract 1), handling
5344 this case seems like an unnecessary complication. */
5345 if (TREE_CODE (size
) == INTEGER_CST
5346 && !int_fits_type_p (size
, index_type
))
5349 error_at (loc
, "size of array %qE is too large",
5352 error_at (loc
, "size of unnamed array is too large");
5353 type
= error_mark_node
;
5357 itype
= build_index_type (itype
);
5359 if (this_size_varies
)
5362 *expr
= build2 (COMPOUND_EXPR
, TREE_TYPE (size
),
5366 *expr_const_operands
&= size_maybe_const
;
5369 else if (decl_context
== FIELD
)
5371 bool flexible_array_member
= false;
5372 if (array_parm_vla_unspec_p
)
5373 /* Field names can in fact have function prototype
5374 scope so [*] is disallowed here through making
5375 the field variably modified, not through being
5376 something other than a declaration with function
5381 const struct c_declarator
*t
= declarator
;
5382 while (t
->kind
== cdk_attrs
)
5384 flexible_array_member
= (t
->kind
== cdk_id
);
5386 if (flexible_array_member
5387 && pedantic
&& !flag_isoc99
&& !in_system_header
)
5388 pedwarn (loc
, OPT_pedantic
,
5389 "ISO C90 does not support flexible array members");
5391 /* ISO C99 Flexible array members are effectively
5392 identical to GCC's zero-length array extension. */
5393 if (flexible_array_member
|| array_parm_vla_unspec_p
)
5394 itype
= build_range_type (sizetype
, size_zero_node
,
5397 else if (decl_context
== PARM
)
5399 if (array_parm_vla_unspec_p
)
5401 itype
= build_range_type (sizetype
, size_zero_node
, NULL_TREE
);
5405 else if (decl_context
== TYPENAME
)
5407 if (array_parm_vla_unspec_p
)
5410 warning (0, "%<[*]%> not in a declaration");
5411 /* We use this to avoid messing up with incomplete
5412 array types of the same type, that would
5413 otherwise be modified below. */
5414 itype
= build_range_type (sizetype
, size_zero_node
,
5420 /* Complain about arrays of incomplete types. */
5421 if (!COMPLETE_TYPE_P (type
))
5423 error_at (loc
, "array type has incomplete element type");
5424 type
= error_mark_node
;
5427 /* When itype is NULL, a shared incomplete array type is
5428 returned for all array of a given type. Elsewhere we
5429 make sure we don't complete that type before copying
5430 it, but here we want to make sure we don't ever
5431 modify the shared type, so we gcc_assert (itype)
5434 addr_space_t as
= DECODE_QUAL_ADDR_SPACE (type_quals
);
5435 if (!ADDR_SPACE_GENERIC_P (as
) && as
!= TYPE_ADDR_SPACE (type
))
5436 type
= build_qualified_type (type
,
5437 ENCODE_QUAL_ADDR_SPACE (as
));
5439 type
= build_array_type (type
, itype
);
5442 if (type
!= error_mark_node
)
5446 /* It is ok to modify type here even if itype is
5447 NULL: if size_varies, we're in a
5448 multi-dimensional array and the inner type has
5449 variable size, so the enclosing shared array type
5451 if (size
&& TREE_CODE (size
) == INTEGER_CST
)
5453 = build_distinct_type_copy (TYPE_MAIN_VARIANT (type
));
5454 C_TYPE_VARIABLE_SIZE (type
) = 1;
5457 /* The GCC extension for zero-length arrays differs from
5458 ISO flexible array members in that sizeof yields
5460 if (size
&& integer_zerop (size
))
5463 type
= build_distinct_type_copy (TYPE_MAIN_VARIANT (type
));
5464 TYPE_SIZE (type
) = bitsize_zero_node
;
5465 TYPE_SIZE_UNIT (type
) = size_zero_node
;
5466 SET_TYPE_STRUCTURAL_EQUALITY (type
);
5468 if (array_parm_vla_unspec_p
)
5471 /* The type is complete. C99 6.7.5.2p4 */
5472 type
= build_distinct_type_copy (TYPE_MAIN_VARIANT (type
));
5473 TYPE_SIZE (type
) = bitsize_zero_node
;
5474 TYPE_SIZE_UNIT (type
) = size_zero_node
;
5475 SET_TYPE_STRUCTURAL_EQUALITY (type
);
5479 if (decl_context
!= PARM
5480 && (array_ptr_quals
!= TYPE_UNQUALIFIED
5481 || array_ptr_attrs
!= NULL_TREE
5482 || array_parm_static
))
5484 error_at (loc
, "static or type qualifiers in non-parameter array declarator");
5485 array_ptr_quals
= TYPE_UNQUALIFIED
;
5486 array_ptr_attrs
= NULL_TREE
;
5487 array_parm_static
= 0;
5493 /* Say it's a definition only for the declarator closest
5494 to the identifier, apart possibly from some
5496 bool really_funcdef
= false;
5500 const struct c_declarator
*t
= declarator
->declarator
;
5501 while (t
->kind
== cdk_attrs
)
5503 really_funcdef
= (t
->kind
== cdk_id
);
5506 /* Declaring a function type. Make sure we have a valid
5507 type for the function to return. */
5508 if (type
== error_mark_node
)
5511 size_varies
= false;
5513 /* Warn about some types functions can't return. */
5514 if (TREE_CODE (type
) == FUNCTION_TYPE
)
5517 error_at (loc
, "%qE declared as function returning a "
5520 error_at (loc
, "type name declared as function "
5521 "returning a function");
5522 type
= integer_type_node
;
5524 if (TREE_CODE (type
) == ARRAY_TYPE
)
5527 error_at (loc
, "%qE declared as function returning an array",
5530 error_at (loc
, "type name declared as function returning "
5532 type
= integer_type_node
;
5534 errmsg
= targetm
.invalid_return_type (type
);
5538 type
= integer_type_node
;
5541 /* Construct the function type and go to the next
5542 inner layer of declarator. */
5543 arg_info
= declarator
->u
.arg_info
;
5544 arg_types
= grokparms (arg_info
, really_funcdef
);
5546 /* Type qualifiers before the return type of the function
5547 qualify the return type, not the function type. */
5550 /* Type qualifiers on a function return type are
5551 normally permitted by the standard but have no
5552 effect, so give a warning at -Wreturn-type.
5553 Qualifiers on a void return type are banned on
5554 function definitions in ISO C; GCC used to used
5555 them for noreturn functions. */
5556 if (VOID_TYPE_P (type
) && really_funcdef
)
5558 "function definition has qualified void return type");
5560 warning_at (loc
, OPT_Wignored_qualifiers
,
5561 "type qualifiers ignored on function return type");
5563 type
= c_build_qualified_type (type
, type_quals
);
5565 type_quals
= TYPE_UNQUALIFIED
;
5567 type
= build_function_type (type
, arg_types
);
5568 declarator
= declarator
->declarator
;
5570 /* Set the TYPE_CONTEXTs for each tagged type which is local to
5571 the formal parameter list of this FUNCTION_TYPE to point to
5572 the FUNCTION_TYPE node itself. */
5577 FOR_EACH_VEC_ELT_REVERSE (c_arg_tag
, arg_info
->tags
, ix
, tag
)
5578 TYPE_CONTEXT (tag
->type
) = type
;
5584 /* Merge any constancy or volatility into the target type
5587 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
5589 pedwarn (loc
, OPT_pedantic
,
5590 "ISO C forbids qualified function types");
5592 type
= c_build_qualified_type (type
, type_quals
);
5593 size_varies
= false;
5595 /* When the pointed-to type involves components of variable size,
5596 care must be taken to ensure that the size evaluation code is
5597 emitted early enough to dominate all the possible later uses
5598 and late enough for the variables on which it depends to have
5601 This is expected to happen automatically when the pointed-to
5602 type has a name/declaration of it's own, but special attention
5603 is required if the type is anonymous.
5605 We handle the NORMAL and FIELD contexts here by attaching an
5606 artificial TYPE_DECL to such pointed-to type. This forces the
5607 sizes evaluation at a safe point and ensures it is not deferred
5608 until e.g. within a deeper conditional context.
5610 We expect nothing to be needed here for PARM or TYPENAME.
5611 Pushing a TYPE_DECL at this point for TYPENAME would actually
5612 be incorrect, as we might be in the middle of an expression
5613 with side effects on the pointed-to type size "arguments" prior
5614 to the pointer declaration point and the fake TYPE_DECL in the
5615 enclosing context would force the size evaluation prior to the
5618 if (!TYPE_NAME (type
)
5619 && (decl_context
== NORMAL
|| decl_context
== FIELD
)
5620 && variably_modified_type_p (type
, NULL_TREE
))
5622 tree decl
= build_decl (loc
, TYPE_DECL
, NULL_TREE
, type
);
5623 DECL_ARTIFICIAL (decl
) = 1;
5625 finish_decl (decl
, loc
, NULL_TREE
, NULL_TREE
, NULL_TREE
);
5626 TYPE_NAME (type
) = decl
;
5629 type
= build_pointer_type (type
);
5631 /* Process type qualifiers (such as const or volatile)
5632 that were given inside the `*'. */
5633 type_quals
= declarator
->u
.pointer_quals
;
5635 declarator
= declarator
->declarator
;
5642 *decl_attrs
= chainon (returned_attrs
, *decl_attrs
);
5644 /* Now TYPE has the actual type, apart from any qualifiers in
5647 /* Warn about address space used for things other than static memory or
5649 address_space
= DECODE_QUAL_ADDR_SPACE (type_quals
);
5650 if (!ADDR_SPACE_GENERIC_P (address_space
))
5652 if (decl_context
== NORMAL
)
5654 switch (storage_class
)
5657 error ("%qs combined with %<auto%> qualifier for %qE",
5658 c_addr_space_name (address_space
), name
);
5661 error ("%qs combined with %<register%> qualifier for %qE",
5662 c_addr_space_name (address_space
), name
);
5665 if (current_function_scope
)
5667 error ("%qs specified for auto variable %qE",
5668 c_addr_space_name (address_space
), name
);
5680 else if (decl_context
== PARM
&& TREE_CODE (type
) != ARRAY_TYPE
)
5683 error ("%qs specified for parameter %qE",
5684 c_addr_space_name (address_space
), name
);
5686 error ("%qs specified for unnamed parameter",
5687 c_addr_space_name (address_space
));
5689 else if (decl_context
== FIELD
)
5692 error ("%qs specified for structure field %qE",
5693 c_addr_space_name (address_space
), name
);
5695 error ("%qs specified for structure field",
5696 c_addr_space_name (address_space
));
5700 /* Check the type and width of a bit-field. */
5702 check_bitfield_type_and_width (&type
, width
, name
);
5704 /* Did array size calculations overflow? */
5706 if (TREE_CODE (type
) == ARRAY_TYPE
5707 && COMPLETE_TYPE_P (type
)
5708 && TREE_CODE (TYPE_SIZE_UNIT (type
)) == INTEGER_CST
5709 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type
)))
5712 error_at (loc
, "size of array %qE is too large", name
);
5714 error_at (loc
, "size of unnamed array is too large");
5715 /* If we proceed with the array type as it is, we'll eventually
5716 crash in tree_low_cst(). */
5717 type
= error_mark_node
;
5720 /* If this is declaring a typedef name, return a TYPE_DECL. */
5722 if (storage_class
== csc_typedef
)
5725 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
5727 pedwarn (loc
, OPT_pedantic
,
5728 "ISO C forbids qualified function types");
5730 type
= c_build_qualified_type (type
, type_quals
);
5731 decl
= build_decl (declarator
->id_loc
,
5732 TYPE_DECL
, declarator
->u
.id
, type
);
5733 if (declspecs
->explicit_signed_p
)
5734 C_TYPEDEF_EXPLICITLY_SIGNED (decl
) = 1;
5735 if (declspecs
->inline_p
)
5736 pedwarn (loc
, 0,"typedef %q+D declared %<inline%>", decl
);
5738 if (warn_cxx_compat
&& declarator
->u
.id
!= NULL_TREE
)
5740 struct c_binding
*b
= I_TAG_BINDING (declarator
->u
.id
);
5743 && b
->decl
!= NULL_TREE
5744 && (B_IN_CURRENT_SCOPE (b
)
5745 || (current_scope
== file_scope
&& B_IN_EXTERNAL_SCOPE (b
)))
5746 && TYPE_MAIN_VARIANT (b
->decl
) != TYPE_MAIN_VARIANT (type
))
5748 warning_at (declarator
->id_loc
, OPT_Wc___compat
,
5749 ("using %qD as both a typedef and a tag is "
5752 if (b
->locus
!= UNKNOWN_LOCATION
)
5753 inform (b
->locus
, "originally defined here");
5760 /* If this is a type name (such as, in a cast or sizeof),
5761 compute the type and return it now. */
5763 if (decl_context
== TYPENAME
)
5765 /* Note that the grammar rejects storage classes in typenames
5767 gcc_assert (storage_class
== csc_none
&& !threadp
5768 && !declspecs
->inline_p
);
5769 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
5771 pedwarn (loc
, OPT_pedantic
,
5772 "ISO C forbids const or volatile function types");
5774 type
= c_build_qualified_type (type
, type_quals
);
5778 if (pedantic
&& decl_context
== FIELD
5779 && variably_modified_type_p (type
, NULL_TREE
))
5782 pedwarn (loc
, OPT_pedantic
, "a member of a structure or union cannot "
5783 "have a variably modified type");
5786 /* Aside from typedefs and type names (handle above),
5787 `void' at top level (not within pointer)
5788 is allowed only in public variables.
5789 We don't complain about parms either, but that is because
5790 a better error message can be made later. */
5792 if (VOID_TYPE_P (type
) && decl_context
!= PARM
5793 && !((decl_context
!= FIELD
&& TREE_CODE (type
) != FUNCTION_TYPE
)
5794 && (storage_class
== csc_extern
5795 || (current_scope
== file_scope
5796 && !(storage_class
== csc_static
5797 || storage_class
== csc_register
)))))
5799 error_at (loc
, "variable or field %qE declared void", name
);
5800 type
= integer_type_node
;
5803 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
5804 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
5809 if (decl_context
== PARM
)
5813 /* A parameter declared as an array of T is really a pointer to T.
5814 One declared as a function is really a pointer to a function. */
5816 if (TREE_CODE (type
) == ARRAY_TYPE
)
5818 /* Transfer const-ness of array into that of type pointed to. */
5819 type
= TREE_TYPE (type
);
5821 type
= c_build_qualified_type (type
, type_quals
);
5822 type
= build_pointer_type (type
);
5823 type_quals
= array_ptr_quals
;
5825 type
= c_build_qualified_type (type
, type_quals
);
5827 /* We don't yet implement attributes in this context. */
5828 if (array_ptr_attrs
!= NULL_TREE
)
5829 warning_at (loc
, OPT_Wattributes
,
5830 "attributes in parameter array declarator ignored");
5832 size_varies
= false;
5834 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
5837 pedwarn (loc
, OPT_pedantic
,
5838 "ISO C forbids qualified function types");
5840 type
= c_build_qualified_type (type
, type_quals
);
5841 type
= build_pointer_type (type
);
5842 type_quals
= TYPE_UNQUALIFIED
;
5844 else if (type_quals
)
5845 type
= c_build_qualified_type (type
, type_quals
);
5847 decl
= build_decl (declarator
->id_loc
,
5848 PARM_DECL
, declarator
->u
.id
, type
);
5850 C_DECL_VARIABLE_SIZE (decl
) = 1;
5852 /* Compute the type actually passed in the parmlist,
5853 for the case where there is no prototype.
5854 (For example, shorts and chars are passed as ints.)
5855 When there is a prototype, this is overridden later. */
5857 if (type
== error_mark_node
)
5858 promoted_type
= type
;
5860 promoted_type
= c_type_promotes_to (type
);
5862 DECL_ARG_TYPE (decl
) = promoted_type
;
5863 if (declspecs
->inline_p
)
5864 pedwarn (loc
, 0, "parameter %q+D declared %<inline%>", decl
);
5866 else if (decl_context
== FIELD
)
5868 /* Note that the grammar rejects storage classes in typenames
5870 gcc_assert (storage_class
== csc_none
&& !threadp
5871 && !declspecs
->inline_p
);
5873 /* Structure field. It may not be a function. */
5875 if (TREE_CODE (type
) == FUNCTION_TYPE
)
5877 error_at (loc
, "field %qE declared as a function", name
);
5878 type
= build_pointer_type (type
);
5880 else if (TREE_CODE (type
) != ERROR_MARK
5881 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type
))
5884 error_at (loc
, "field %qE has incomplete type", name
);
5886 error_at (loc
, "unnamed field has incomplete type");
5887 type
= error_mark_node
;
5889 type
= c_build_qualified_type (type
, type_quals
);
5890 decl
= build_decl (declarator
->id_loc
,
5891 FIELD_DECL
, declarator
->u
.id
, type
);
5892 DECL_NONADDRESSABLE_P (decl
) = bitfield
;
5893 if (bitfield
&& !declarator
->u
.id
)
5894 TREE_NO_WARNING (decl
) = 1;
5897 C_DECL_VARIABLE_SIZE (decl
) = 1;
5899 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
5901 if (storage_class
== csc_register
|| threadp
)
5903 error_at (loc
, "invalid storage class for function %qE", name
);
5905 else if (current_scope
!= file_scope
)
5907 /* Function declaration not at file scope. Storage
5908 classes other than `extern' are not allowed, C99
5909 6.7.1p5, and `extern' makes no difference. However,
5910 GCC allows 'auto', perhaps with 'inline', to support
5911 nested functions. */
5912 if (storage_class
== csc_auto
)
5913 pedwarn (loc
, OPT_pedantic
,
5914 "invalid storage class for function %qE", name
);
5915 else if (storage_class
== csc_static
)
5917 error_at (loc
, "invalid storage class for function %qE", name
);
5919 storage_class
= declspecs
->storage_class
= csc_none
;
5925 decl
= build_decl (declarator
->id_loc
,
5926 FUNCTION_DECL
, declarator
->u
.id
, type
);
5927 decl
= build_decl_attribute_variant (decl
, decl_attr
);
5929 if (pedantic
&& type_quals
&& !DECL_IN_SYSTEM_HEADER (decl
))
5930 pedwarn (loc
, OPT_pedantic
,
5931 "ISO C forbids qualified function types");
5933 /* Every function declaration is an external reference
5934 (DECL_EXTERNAL) except for those which are not at file
5935 scope and are explicitly declared "auto". This is
5936 forbidden by standard C (C99 6.7.1p5) and is interpreted by
5937 GCC to signify a forward declaration of a nested function. */
5938 if (storage_class
== csc_auto
&& current_scope
!= file_scope
)
5939 DECL_EXTERNAL (decl
) = 0;
5940 /* In C99, a function which is declared 'inline' with 'extern'
5941 is not an external reference (which is confusing). It
5942 means that the later definition of the function must be output
5943 in this file, C99 6.7.4p6. In GNU C89, a function declared
5944 'extern inline' is an external reference. */
5945 else if (declspecs
->inline_p
&& storage_class
!= csc_static
)
5946 DECL_EXTERNAL (decl
) = ((storage_class
== csc_extern
)
5947 == flag_gnu89_inline
);
5949 DECL_EXTERNAL (decl
) = !initialized
;
5951 /* Record absence of global scope for `static' or `auto'. */
5953 = !(storage_class
== csc_static
|| storage_class
== csc_auto
);
5955 /* For a function definition, record the argument information
5956 block where store_parm_decls will look for it. */
5958 current_function_arg_info
= arg_info
;
5960 if (declspecs
->default_int_p
)
5961 C_FUNCTION_IMPLICIT_INT (decl
) = 1;
5963 /* Record presence of `inline', if it is reasonable. */
5964 if (flag_hosted
&& MAIN_NAME_P (declarator
->u
.id
))
5966 if (declspecs
->inline_p
)
5967 pedwarn (loc
, 0, "cannot inline function %<main%>");
5969 else if (declspecs
->inline_p
)
5970 /* Record that the function is declared `inline'. */
5971 DECL_DECLARED_INLINE_P (decl
) = 1;
5975 /* It's a variable. */
5976 /* An uninitialized decl with `extern' is a reference. */
5977 int extern_ref
= !initialized
&& storage_class
== csc_extern
;
5979 type
= c_build_qualified_type (type
, type_quals
);
5981 /* C99 6.2.2p7: It is invalid (compile-time undefined
5982 behavior) to create an 'extern' declaration for a
5983 variable if there is a global declaration that is
5984 'static' and the global declaration is not visible.
5985 (If the static declaration _is_ currently visible,
5986 the 'extern' declaration is taken to refer to that decl.) */
5987 if (extern_ref
&& current_scope
!= file_scope
)
5989 tree global_decl
= identifier_global_value (declarator
->u
.id
);
5990 tree visible_decl
= lookup_name (declarator
->u
.id
);
5993 && global_decl
!= visible_decl
5994 && TREE_CODE (global_decl
) == VAR_DECL
5995 && !TREE_PUBLIC (global_decl
))
5996 error_at (loc
, "variable previously declared %<static%> "
5997 "redeclared %<extern%>");
6000 decl
= build_decl (declarator
->id_loc
,
6001 VAR_DECL
, declarator
->u
.id
, type
);
6003 C_DECL_VARIABLE_SIZE (decl
) = 1;
6005 if (declspecs
->inline_p
)
6006 pedwarn (loc
, 0, "variable %q+D declared %<inline%>", decl
);
6008 /* At file scope, an initialized extern declaration may follow
6009 a static declaration. In that case, DECL_EXTERNAL will be
6010 reset later in start_decl. */
6011 DECL_EXTERNAL (decl
) = (storage_class
== csc_extern
);
6013 /* At file scope, the presence of a `static' or `register' storage
6014 class specifier, or the absence of all storage class specifiers
6015 makes this declaration a definition (perhaps tentative). Also,
6016 the absence of `static' makes it public. */
6017 if (current_scope
== file_scope
)
6019 TREE_PUBLIC (decl
) = storage_class
!= csc_static
;
6020 TREE_STATIC (decl
) = !extern_ref
;
6022 /* Not at file scope, only `static' makes a static definition. */
6025 TREE_STATIC (decl
) = (storage_class
== csc_static
);
6026 TREE_PUBLIC (decl
) = extern_ref
;
6030 DECL_TLS_MODEL (decl
) = decl_default_tls_model (decl
);
6033 if ((storage_class
== csc_extern
6034 || (storage_class
== csc_none
6035 && TREE_CODE (type
) == FUNCTION_TYPE
6037 && variably_modified_type_p (type
, NULL_TREE
))
6040 if (TREE_CODE (type
) == FUNCTION_TYPE
)
6041 error_at (loc
, "non-nested function with variably modified type");
6043 error_at (loc
, "object with variably modified type must have "
6047 /* Record `register' declaration for warnings on &
6048 and in case doing stupid register allocation. */
6050 if (storage_class
== csc_register
)
6052 C_DECL_REGISTER (decl
) = 1;
6053 DECL_REGISTER (decl
) = 1;
6056 /* Record constancy and volatility. */
6057 c_apply_type_quals_to_decl (type_quals
, decl
);
6059 /* If a type has volatile components, it should be stored in memory.
6060 Otherwise, the fact that those components are volatile
6061 will be ignored, and would even crash the compiler.
6062 Of course, this only makes sense on VAR,PARM, and RESULT decl's. */
6063 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl
))
6064 && (TREE_CODE (decl
) == VAR_DECL
|| TREE_CODE (decl
) == PARM_DECL
6065 || TREE_CODE (decl
) == RESULT_DECL
))
6067 /* It is not an error for a structure with volatile fields to
6068 be declared register, but reset DECL_REGISTER since it
6069 cannot actually go in a register. */
6070 int was_reg
= C_DECL_REGISTER (decl
);
6071 C_DECL_REGISTER (decl
) = 0;
6072 DECL_REGISTER (decl
) = 0;
6073 c_mark_addressable (decl
);
6074 C_DECL_REGISTER (decl
) = was_reg
;
6077 /* This is the earliest point at which we might know the assembler
6078 name of a variable. Thus, if it's known before this, die horribly. */
6079 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl
));
6082 && TREE_CODE (decl
) == VAR_DECL
6083 && TREE_PUBLIC (decl
)
6084 && TREE_STATIC (decl
)
6085 && (TREE_CODE (TREE_TYPE (decl
)) == RECORD_TYPE
6086 || TREE_CODE (TREE_TYPE (decl
)) == UNION_TYPE
6087 || TREE_CODE (TREE_TYPE (decl
)) == ENUMERAL_TYPE
)
6088 && TYPE_NAME (TREE_TYPE (decl
)) == NULL_TREE
)
6089 warning_at (DECL_SOURCE_LOCATION (decl
), OPT_Wc___compat
,
6090 ("non-local variable %qD with anonymous type is "
6091 "questionable in C++"),
6098 /* Decode the parameter-list info for a function type or function definition.
6099 The argument is the value returned by `get_parm_info' (or made in c-parse.c
6100 if there is an identifier list instead of a parameter decl list).
6101 These two functions are separate because when a function returns
6102 or receives functions then each is called multiple times but the order
6103 of calls is different. The last call to `grokparms' is always the one
6104 that contains the formal parameter names of a function definition.
6106 Return a list of arg types to use in the FUNCTION_TYPE for this function.
6108 FUNCDEF_FLAG is true for a function definition, false for
6109 a mere declaration. A nonempty identifier-list gets an error message
6110 when FUNCDEF_FLAG is false. */
6113 grokparms (struct c_arg_info
*arg_info
, bool funcdef_flag
)
6115 tree arg_types
= arg_info
->types
;
6117 if (funcdef_flag
&& arg_info
->had_vla_unspec
)
6119 /* A function definition isn't function prototype scope C99 6.2.1p4. */
6121 error ("%<[*]%> not allowed in other than function prototype scope");
6124 if (arg_types
== 0 && !funcdef_flag
&& !in_system_header
)
6125 warning (OPT_Wstrict_prototypes
,
6126 "function declaration isn%'t a prototype");
6128 if (arg_types
== error_mark_node
)
6129 return 0; /* don't set TYPE_ARG_TYPES in this case */
6131 else if (arg_types
&& TREE_CODE (TREE_VALUE (arg_types
)) == IDENTIFIER_NODE
)
6135 pedwarn (input_location
, 0, "parameter names (without types) in function declaration");
6136 arg_info
->parms
= NULL_TREE
;
6139 arg_info
->parms
= arg_info
->types
;
6141 arg_info
->types
= 0;
6146 tree parm
, type
, typelt
;
6147 unsigned int parmno
;
6150 /* If there is a parameter of incomplete type in a definition,
6151 this is an error. In a declaration this is valid, and a
6152 struct or union type may be completed later, before any calls
6153 or definition of the function. In the case where the tag was
6154 first declared within the parameter list, a warning has
6155 already been given. If a parameter has void type, then
6156 however the function cannot be defined or called, so
6159 for (parm
= arg_info
->parms
, typelt
= arg_types
, parmno
= 1;
6161 parm
= DECL_CHAIN (parm
), typelt
= TREE_CHAIN (typelt
), parmno
++)
6163 type
= TREE_VALUE (typelt
);
6164 if (type
== error_mark_node
)
6167 if (!COMPLETE_TYPE_P (type
))
6171 if (DECL_NAME (parm
))
6172 error_at (input_location
,
6173 "parameter %u (%q+D) has incomplete type",
6176 error_at (DECL_SOURCE_LOCATION (parm
),
6177 "parameter %u has incomplete type",
6180 TREE_VALUE (typelt
) = error_mark_node
;
6181 TREE_TYPE (parm
) = error_mark_node
;
6182 arg_types
= NULL_TREE
;
6184 else if (VOID_TYPE_P (type
))
6186 if (DECL_NAME (parm
))
6187 warning_at (input_location
, 0,
6188 "parameter %u (%q+D) has void type",
6191 warning_at (DECL_SOURCE_LOCATION (parm
), 0,
6192 "parameter %u has void type",
6197 errmsg
= targetm
.invalid_parameter_type (type
);
6201 TREE_VALUE (typelt
) = error_mark_node
;
6202 TREE_TYPE (parm
) = error_mark_node
;
6203 arg_types
= NULL_TREE
;
6206 if (DECL_NAME (parm
) && TREE_USED (parm
))
6207 warn_if_shadowing (parm
);
6213 /* Allocate and initialize a c_arg_info structure from the parser's
6217 build_arg_info (void)
6219 struct c_arg_info
*ret
= XOBNEW (&parser_obstack
, struct c_arg_info
);
6220 ret
->parms
= NULL_TREE
;
6222 ret
->types
= NULL_TREE
;
6223 ret
->others
= NULL_TREE
;
6224 ret
->pending_sizes
= NULL
;
6225 ret
->had_vla_unspec
= 0;
6229 /* Take apart the current scope and return a c_arg_info structure with
6230 info on a parameter list just parsed.
6232 This structure is later fed to 'grokparms' and 'store_parm_decls'.
6234 ELLIPSIS being true means the argument list ended in '...' so don't
6235 append a sentinel (void_list_node) to the end of the type-list.
6237 EXPR is NULL or an expression that needs to be evaluated for the
6238 side effects of array size expressions in the parameters. */
6241 get_parm_info (bool ellipsis
, tree expr
)
6243 struct c_binding
*b
= current_scope
->bindings
;
6244 struct c_arg_info
*arg_info
= build_arg_info ();
6247 VEC(c_arg_tag
,gc
) *tags
= NULL
;
6251 static bool explained_incomplete_types
= false;
6252 bool gave_void_only_once_err
= false;
6254 arg_info
->had_vla_unspec
= current_scope
->had_vla_unspec
;
6256 /* The bindings in this scope must not get put into a block.
6257 We will take care of deleting the binding nodes. */
6258 current_scope
->bindings
= 0;
6260 /* This function is only called if there was *something* on the
6264 /* A parameter list consisting solely of 'void' indicates that the
6265 function takes no arguments. But if the 'void' is qualified
6266 (by 'const' or 'volatile'), or has a storage class specifier
6267 ('register'), then the behavior is undefined; issue an error.
6268 Typedefs for 'void' are OK (see DR#157). */
6269 if (b
->prev
== 0 /* one binding */
6270 && TREE_CODE (b
->decl
) == PARM_DECL
/* which is a parameter */
6271 && !DECL_NAME (b
->decl
) /* anonymous */
6272 && VOID_TYPE_P (TREE_TYPE (b
->decl
))) /* of void type */
6274 if (TREE_THIS_VOLATILE (b
->decl
)
6275 || TREE_READONLY (b
->decl
)
6276 || C_DECL_REGISTER (b
->decl
))
6277 error ("%<void%> as only parameter may not be qualified");
6279 /* There cannot be an ellipsis. */
6281 error ("%<void%> must be the only parameter");
6283 arg_info
->types
= void_list_node
;
6288 types
= void_list_node
;
6290 /* Break up the bindings list into parms, tags, types, and others;
6291 apply sanity checks; purge the name-to-decl bindings. */
6294 tree decl
= b
->decl
;
6295 tree type
= TREE_TYPE (decl
);
6297 const char *keyword
;
6299 switch (TREE_CODE (decl
))
6304 gcc_assert (I_SYMBOL_BINDING (b
->id
) == b
);
6305 I_SYMBOL_BINDING (b
->id
) = b
->shadowed
;
6308 /* Check for forward decls that never got their actual decl. */
6309 if (TREE_ASM_WRITTEN (decl
))
6310 error ("parameter %q+D has just a forward declaration", decl
);
6311 /* Check for (..., void, ...) and issue an error. */
6312 else if (VOID_TYPE_P (type
) && !DECL_NAME (decl
))
6314 if (!gave_void_only_once_err
)
6316 error ("%<void%> must be the only parameter");
6317 gave_void_only_once_err
= true;
6322 /* Valid parameter, add it to the list. */
6323 DECL_CHAIN (decl
) = parms
;
6326 /* Since there is a prototype, args are passed in their
6327 declared types. The back end may override this later. */
6328 DECL_ARG_TYPE (decl
) = type
;
6329 types
= tree_cons (0, type
, types
);
6333 case ENUMERAL_TYPE
: keyword
= "enum"; goto tag
;
6334 case UNION_TYPE
: keyword
= "union"; goto tag
;
6335 case RECORD_TYPE
: keyword
= "struct"; goto tag
;
6337 /* Types may not have tag-names, in which case the type
6338 appears in the bindings list with b->id NULL. */
6341 gcc_assert (I_TAG_BINDING (b
->id
) == b
);
6342 I_TAG_BINDING (b
->id
) = b
->shadowed
;
6345 /* Warn about any struct, union or enum tags defined in a
6346 parameter list. The scope of such types is limited to
6347 the parameter list, which is rarely if ever desirable
6348 (it's impossible to call such a function with type-
6349 correct arguments). An anonymous union parm type is
6350 meaningful as a GNU extension, so don't warn for that. */
6351 if (TREE_CODE (decl
) != UNION_TYPE
|| b
->id
!= 0)
6354 /* The %s will be one of 'struct', 'union', or 'enum'. */
6355 warning (0, "%<%s %E%> declared inside parameter list",
6358 /* The %s will be one of 'struct', 'union', or 'enum'. */
6359 warning (0, "anonymous %s declared inside parameter list",
6362 if (!explained_incomplete_types
)
6364 warning (0, "its scope is only this definition or declaration,"
6365 " which is probably not what you want");
6366 explained_incomplete_types
= true;
6370 tag
= VEC_safe_push (c_arg_tag
, gc
, tags
, NULL
);
6378 /* CONST_DECLs appear here when we have an embedded enum,
6379 and TYPE_DECLs appear here when we have an embedded struct
6380 or union. No warnings for this - we already warned about the
6381 type itself. FUNCTION_DECLs appear when there is an implicit
6382 function declaration in the parameter list. */
6384 /* When we reinsert this decl in the function body, we need
6385 to reconstruct whether it was marked as nested. */
6386 gcc_assert (TREE_CODE (decl
) == FUNCTION_DECL
6389 DECL_CHAIN (decl
) = others
;
6394 /* error_mark_node appears here when we have an undeclared
6395 variable. Just throw it away. */
6398 gcc_assert (I_SYMBOL_BINDING (b
->id
) == b
);
6399 I_SYMBOL_BINDING (b
->id
) = b
->shadowed
;
6403 /* Other things that might be encountered. */
6410 b
= free_binding_and_advance (b
);
6413 arg_info
->parms
= parms
;
6414 arg_info
->tags
= tags
;
6415 arg_info
->types
= types
;
6416 arg_info
->others
= others
;
6417 arg_info
->pending_sizes
= expr
;
6421 /* Get the struct, enum or union (CODE says which) with tag NAME.
6422 Define the tag as a forward-reference with location LOC if it is
6423 not defined. Return a c_typespec structure for the type
6427 parser_xref_tag (location_t loc
, enum tree_code code
, tree name
)
6429 struct c_typespec ret
;
6433 ret
.expr
= NULL_TREE
;
6434 ret
.expr_const_operands
= true;
6436 /* If a cross reference is requested, look up the type
6437 already defined for this tag and return it. */
6439 ref
= lookup_tag (code
, name
, 0, &refloc
);
6440 /* If this is the right type of tag, return what we found.
6441 (This reference will be shadowed by shadow_tag later if appropriate.)
6442 If this is the wrong type of tag, do not return it. If it was the
6443 wrong type in the same scope, we will have had an error
6444 message already; if in a different scope and declaring
6445 a name, pending_xref_error will give an error message; but if in a
6446 different scope and not declaring a name, this tag should
6447 shadow the previous declaration of a different type of tag, and
6448 this would not work properly if we return the reference found.
6449 (For example, with "struct foo" in an outer scope, "union foo;"
6450 must shadow that tag with a new one of union type.) */
6451 ret
.kind
= (ref
? ctsk_tagref
: ctsk_tagfirstref
);
6452 if (ref
&& TREE_CODE (ref
) == code
)
6454 if (C_TYPE_DEFINED_IN_STRUCT (ref
)
6455 && loc
!= UNKNOWN_LOCATION
6461 warning_at (loc
, OPT_Wc___compat
,
6462 ("enum type defined in struct or union "
6463 "is not visible in C++"));
6464 inform (refloc
, "enum type defined here");
6467 warning_at (loc
, OPT_Wc___compat
,
6468 ("struct defined in struct or union "
6469 "is not visible in C++"));
6470 inform (refloc
, "struct defined here");
6473 warning_at (loc
, OPT_Wc___compat
,
6474 ("union defined in struct or union "
6475 "is not visible in C++"));
6476 inform (refloc
, "union defined here");
6487 /* If no such tag is yet defined, create a forward-reference node
6488 and record it as the "definition".
6489 When a real declaration of this type is found,
6490 the forward-reference will be altered into a real type. */
6492 ref
= make_node (code
);
6493 if (code
== ENUMERAL_TYPE
)
6495 /* Give the type a default layout like unsigned int
6496 to avoid crashing if it does not get defined. */
6497 SET_TYPE_MODE (ref
, TYPE_MODE (unsigned_type_node
));
6498 TYPE_ALIGN (ref
) = TYPE_ALIGN (unsigned_type_node
);
6499 TYPE_USER_ALIGN (ref
) = 0;
6500 TYPE_UNSIGNED (ref
) = 1;
6501 TYPE_PRECISION (ref
) = TYPE_PRECISION (unsigned_type_node
);
6502 TYPE_MIN_VALUE (ref
) = TYPE_MIN_VALUE (unsigned_type_node
);
6503 TYPE_MAX_VALUE (ref
) = TYPE_MAX_VALUE (unsigned_type_node
);
6506 pushtag (loc
, name
, ref
);
6512 /* Get the struct, enum or union (CODE says which) with tag NAME.
6513 Define the tag as a forward-reference if it is not defined.
6514 Return a tree for the type. */
6517 xref_tag (enum tree_code code
, tree name
)
6519 return parser_xref_tag (input_location
, code
, name
).spec
;
6522 /* Make sure that the tag NAME is defined *in the current scope*
6523 at least as a forward reference.
6524 LOC is the location of the struct's definition.
6525 CODE says which kind of tag NAME ought to be.
6527 This stores the current value of the file static STRUCT_PARSE_INFO
6528 in *ENCLOSING_STRUCT_PARSE_INFO, and points STRUCT_PARSE_INFO at a
6529 new c_struct_parse_info structure. The old value of
6530 STRUCT_PARSE_INFO is restored in finish_struct. */
6533 start_struct (location_t loc
, enum tree_code code
, tree name
,
6534 struct c_struct_parse_info
**enclosing_struct_parse_info
)
6536 /* If there is already a tag defined at this scope
6537 (as a forward reference), just return it. */
6539 tree ref
= NULL_TREE
;
6540 location_t refloc
= UNKNOWN_LOCATION
;
6542 if (name
!= NULL_TREE
)
6543 ref
= lookup_tag (code
, name
, 1, &refloc
);
6544 if (ref
&& TREE_CODE (ref
) == code
)
6546 if (TYPE_SIZE (ref
))
6548 if (code
== UNION_TYPE
)
6549 error_at (loc
, "redefinition of %<union %E%>", name
);
6551 error_at (loc
, "redefinition of %<struct %E%>", name
);
6552 if (refloc
!= UNKNOWN_LOCATION
)
6553 inform (refloc
, "originally defined here");
6554 /* Don't create structures using a name already in use. */
6557 else if (C_TYPE_BEING_DEFINED (ref
))
6559 if (code
== UNION_TYPE
)
6560 error_at (loc
, "nested redefinition of %<union %E%>", name
);
6562 error_at (loc
, "nested redefinition of %<struct %E%>", name
);
6563 /* Don't bother to report "originally defined here" for a
6564 nested redefinition; the original definition should be
6566 /* Don't create structures that contain themselves. */
6571 /* Otherwise create a forward-reference just so the tag is in scope. */
6573 if (ref
== NULL_TREE
|| TREE_CODE (ref
) != code
)
6575 ref
= make_node (code
);
6576 pushtag (loc
, name
, ref
);
6579 C_TYPE_BEING_DEFINED (ref
) = 1;
6580 TYPE_PACKED (ref
) = flag_pack_struct
;
6582 *enclosing_struct_parse_info
= struct_parse_info
;
6583 struct_parse_info
= XNEW (struct c_struct_parse_info
);
6584 struct_parse_info
->struct_types
= VEC_alloc (tree
, heap
, 0);
6585 struct_parse_info
->fields
= VEC_alloc (c_binding_ptr
, heap
, 0);
6586 struct_parse_info
->typedefs_seen
= VEC_alloc (tree
, heap
, 0);
6588 /* FIXME: This will issue a warning for a use of a type defined
6589 within a statement expr used within sizeof, et. al. This is not
6590 terribly serious as C++ doesn't permit statement exprs within
6592 if (warn_cxx_compat
&& (in_sizeof
|| in_typeof
|| in_alignof
))
6593 warning_at (loc
, OPT_Wc___compat
,
6594 "defining type in %qs expression is invalid in C++",
6597 : (in_typeof
? "typeof" : "alignof")));
6602 /* Process the specs, declarator and width (NULL if omitted)
6603 of a structure component, returning a FIELD_DECL node.
6604 WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node.
6605 DECL_ATTRS is as for grokdeclarator.
6607 LOC is the location of the structure component.
6609 This is done during the parsing of the struct declaration.
6610 The FIELD_DECL nodes are chained together and the lot of them
6611 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
6614 grokfield (location_t loc
,
6615 struct c_declarator
*declarator
, struct c_declspecs
*declspecs
,
6616 tree width
, tree
*decl_attrs
)
6620 if (declarator
->kind
== cdk_id
&& declarator
->u
.id
== NULL_TREE
6621 && width
== NULL_TREE
)
6623 /* This is an unnamed decl.
6625 If we have something of the form "union { list } ;" then this
6626 is the anonymous union extension. Similarly for struct.
6628 If this is something of the form "struct foo;", then
6629 If MS or Plan 9 extensions are enabled, this is handled as
6630 an anonymous struct.
6631 Otherwise this is a forward declaration of a structure tag.
6633 If this is something of the form "foo;" and foo is a TYPE_DECL, then
6634 If foo names a structure or union without a tag, then this
6635 is an anonymous struct (this is permitted by C1X).
6636 If MS or Plan 9 extensions are enabled and foo names a
6637 structure, then again this is an anonymous struct.
6638 Otherwise this is an error.
6640 Oh what a horrid tangled web we weave. I wonder if MS consciously
6641 took this from Plan 9 or if it was an accident of implementation
6642 that took root before someone noticed the bug... */
6644 tree type
= declspecs
->type
;
6645 bool type_ok
= (TREE_CODE (type
) == RECORD_TYPE
6646 || TREE_CODE (type
) == UNION_TYPE
);
6650 && (flag_ms_extensions
6651 || flag_plan9_extensions
6652 || !declspecs
->typedef_p
))
6654 if (flag_ms_extensions
|| flag_plan9_extensions
)
6656 else if (TYPE_NAME (type
) == NULL
)
6663 pedwarn (loc
, 0, "declaration does not declare anything");
6669 pedwarn (loc
, OPT_pedantic
,
6670 "ISO C99 doesn%'t support unnamed structs/unions");
6672 pedwarn (loc
, OPT_pedantic
,
6673 "ISO C90 doesn%'t support unnamed structs/unions");
6677 value
= grokdeclarator (declarator
, declspecs
, FIELD
, false,
6678 width
? &width
: NULL
, decl_attrs
, NULL
, NULL
,
6681 finish_decl (value
, loc
, NULL_TREE
, NULL_TREE
, NULL_TREE
);
6682 DECL_INITIAL (value
) = width
;
6684 if (warn_cxx_compat
&& DECL_NAME (value
) != NULL_TREE
)
6686 /* If we currently have a binding for this field, set the
6687 in_struct field in the binding, so that we warn about lookups
6689 struct c_binding
*b
= I_SYMBOL_BINDING (DECL_NAME (value
));
6692 /* If the in_struct field is not yet set, push it on a list
6693 to be cleared when this struct is finished. */
6696 VEC_safe_push (c_binding_ptr
, heap
,
6697 struct_parse_info
->fields
, b
);
6706 /* Subroutine of detect_field_duplicates: return whether X and Y,
6707 which are both fields in the same struct, have duplicate field
6711 is_duplicate_field (tree x
, tree y
)
6713 if (DECL_NAME (x
) != NULL_TREE
&& DECL_NAME (x
) == DECL_NAME (y
))
6716 /* When using -fplan9-extensions, an anonymous field whose name is a
6717 typedef can duplicate a field name. */
6718 if (flag_plan9_extensions
6719 && (DECL_NAME (x
) == NULL_TREE
|| DECL_NAME (y
) == NULL_TREE
))
6721 tree xt
, xn
, yt
, yn
;
6724 if (DECL_NAME (x
) != NULL_TREE
)
6726 else if ((TREE_CODE (xt
) == RECORD_TYPE
|| TREE_CODE (xt
) == UNION_TYPE
)
6727 && TYPE_NAME (xt
) != NULL_TREE
6728 && TREE_CODE (TYPE_NAME (xt
)) == TYPE_DECL
)
6729 xn
= DECL_NAME (TYPE_NAME (xt
));
6734 if (DECL_NAME (y
) != NULL_TREE
)
6736 else if ((TREE_CODE (yt
) == RECORD_TYPE
|| TREE_CODE (yt
) == UNION_TYPE
)
6737 && TYPE_NAME (yt
) != NULL_TREE
6738 && TREE_CODE (TYPE_NAME (yt
)) == TYPE_DECL
)
6739 yn
= DECL_NAME (TYPE_NAME (yt
));
6743 if (xn
!= NULL_TREE
&& xn
== yn
)
6750 /* Subroutine of detect_field_duplicates: add the fields of FIELDLIST
6751 to HTAB, giving errors for any duplicates. */
6754 detect_field_duplicates_hash (tree fieldlist
, htab_t htab
)
6759 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
6760 if ((y
= DECL_NAME (x
)) != 0)
6762 slot
= htab_find_slot (htab
, y
, INSERT
);
6765 error ("duplicate member %q+D", x
);
6766 DECL_NAME (x
) = NULL_TREE
;
6770 else if (TREE_CODE (TREE_TYPE (x
)) == RECORD_TYPE
6771 || TREE_CODE (TREE_TYPE (x
)) == UNION_TYPE
)
6773 detect_field_duplicates_hash (TYPE_FIELDS (TREE_TYPE (x
)), htab
);
6775 /* When using -fplan9-extensions, an anonymous field whose
6776 name is a typedef can duplicate a field name. */
6777 if (flag_plan9_extensions
6778 && TYPE_NAME (TREE_TYPE (x
)) != NULL_TREE
6779 && TREE_CODE (TYPE_NAME (TREE_TYPE (x
))) == TYPE_DECL
)
6781 tree xn
= DECL_NAME (TYPE_NAME (TREE_TYPE (x
)));
6782 slot
= htab_find_slot (htab
, xn
, INSERT
);
6784 error ("duplicate member %q+D", TYPE_NAME (TREE_TYPE (x
)));
6790 /* Generate an error for any duplicate field names in FIELDLIST. Munge
6791 the list such that this does not present a problem later. */
6794 detect_field_duplicates (tree fieldlist
)
6799 /* If the struct is the list of instance variables of an Objective-C
6800 class, then we need to check all the instance variables of
6801 superclasses when checking for duplicates (since you can't have
6802 an instance variable in a subclass with the same name as an
6803 instance variable in a superclass). We pass on this job to the
6804 Objective-C compiler. objc_detect_field_duplicates() will return
6805 false if we are not checking the list of instance variables and
6806 the C frontend should proceed with the standard field duplicate
6807 checks. If we are checking the list of instance variables, the
6808 ObjC frontend will do the check, emit the errors if needed, and
6809 then return true. */
6810 if (c_dialect_objc ())
6811 if (objc_detect_field_duplicates (false))
6814 /* First, see if there are more than "a few" fields.
6815 This is trivially true if there are zero or one fields. */
6816 if (!fieldlist
|| !DECL_CHAIN (fieldlist
))
6821 if (DECL_NAME (x
) == NULL_TREE
6822 && (TREE_CODE (TREE_TYPE (x
)) == RECORD_TYPE
6823 || TREE_CODE (TREE_TYPE (x
)) == UNION_TYPE
))
6826 } while (timeout
> 0 && x
);
6828 /* If there were "few" fields and no anonymous structures or unions,
6829 avoid the overhead of allocating a hash table. Instead just do
6830 the nested traversal thing. */
6833 for (x
= DECL_CHAIN (fieldlist
); x
; x
= DECL_CHAIN (x
))
6834 /* When using -fplan9-extensions, we can have duplicates
6835 between typedef names and fields. */
6837 || (flag_plan9_extensions
6838 && DECL_NAME (x
) == NULL_TREE
6839 && (TREE_CODE (TREE_TYPE (x
)) == RECORD_TYPE
6840 || TREE_CODE (TREE_TYPE (x
)) == UNION_TYPE
)
6841 && TYPE_NAME (TREE_TYPE (x
)) != NULL_TREE
6842 && TREE_CODE (TYPE_NAME (TREE_TYPE (x
))) == TYPE_DECL
))
6844 for (y
= fieldlist
; y
!= x
; y
= TREE_CHAIN (y
))
6845 if (is_duplicate_field (y
, x
))
6847 error ("duplicate member %q+D", x
);
6848 DECL_NAME (x
) = NULL_TREE
;
6854 htab_t htab
= htab_create (37, htab_hash_pointer
, htab_eq_pointer
, NULL
);
6856 detect_field_duplicates_hash (fieldlist
, htab
);
6861 /* Finish up struct info used by -Wc++-compat. */
6864 warn_cxx_compat_finish_struct (tree fieldlist
)
6868 struct c_binding
*b
;
6870 /* Set the C_TYPE_DEFINED_IN_STRUCT flag for each type defined in
6871 the current struct. We do this now at the end of the struct
6872 because the flag is used to issue visibility warnings, and we
6873 only want to issue those warnings if the type is referenced
6874 outside of the struct declaration. */
6875 FOR_EACH_VEC_ELT (tree
, struct_parse_info
->struct_types
, ix
, x
)
6876 C_TYPE_DEFINED_IN_STRUCT (x
) = 1;
6878 /* The TYPEDEFS_SEEN field of STRUCT_PARSE_INFO is a list of
6879 typedefs used when declaring fields in this struct. If the name
6880 of any of the fields is also a typedef name then the struct would
6881 not parse in C++, because the C++ lookup rules say that the
6882 typedef name would be looked up in the context of the struct, and
6883 would thus be the field rather than the typedef. */
6884 if (!VEC_empty (tree
, struct_parse_info
->typedefs_seen
)
6885 && fieldlist
!= NULL_TREE
)
6887 /* Use a pointer_set using the name of the typedef. We can use
6888 a pointer_set because identifiers are interned. */
6889 struct pointer_set_t
*tset
= pointer_set_create ();
6891 FOR_EACH_VEC_ELT (tree
, struct_parse_info
->typedefs_seen
, ix
, x
)
6892 pointer_set_insert (tset
, DECL_NAME (x
));
6894 for (x
= fieldlist
; x
!= NULL_TREE
; x
= DECL_CHAIN (x
))
6896 if (DECL_NAME (x
) != NULL_TREE
6897 && pointer_set_contains (tset
, DECL_NAME (x
)))
6899 warning_at (DECL_SOURCE_LOCATION (x
), OPT_Wc___compat
,
6900 ("using %qD as both field and typedef name is "
6903 /* FIXME: It would be nice to report the location where
6904 the typedef name is used. */
6908 pointer_set_destroy (tset
);
6911 /* For each field which has a binding and which was not defined in
6912 an enclosing struct, clear the in_struct field. */
6913 FOR_EACH_VEC_ELT (c_binding_ptr
, struct_parse_info
->fields
, ix
, b
)
6917 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
6918 LOC is the location of the RECORD_TYPE or UNION_TYPE's definition.
6919 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
6920 ATTRIBUTES are attributes to be applied to the structure.
6922 ENCLOSING_STRUCT_PARSE_INFO is the value of STRUCT_PARSE_INFO when
6923 the struct was started. */
6926 finish_struct (location_t loc
, tree t
, tree fieldlist
, tree attributes
,
6927 struct c_struct_parse_info
*enclosing_struct_parse_info
)
6930 bool toplevel
= file_scope
== current_scope
;
6931 int saw_named_field
;
6933 /* If this type was previously laid out as a forward reference,
6934 make sure we lay it out again. */
6938 decl_attributes (&t
, attributes
, (int) ATTR_FLAG_TYPE_IN_PLACE
);
6942 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
6944 if (DECL_NAME (x
) != 0)
6947 && (TREE_CODE (TREE_TYPE (x
)) == RECORD_TYPE
6948 || TREE_CODE (TREE_TYPE (x
)) == UNION_TYPE
))
6954 if (TREE_CODE (t
) == UNION_TYPE
)
6957 pedwarn (loc
, OPT_pedantic
, "union has no named members");
6959 pedwarn (loc
, OPT_pedantic
, "union has no members");
6964 pedwarn (loc
, OPT_pedantic
, "struct has no named members");
6966 pedwarn (loc
, OPT_pedantic
, "struct has no members");
6971 /* Install struct as DECL_CONTEXT of each field decl.
6972 Also process specified field sizes, found in the DECL_INITIAL,
6973 storing 0 there after the type has been changed to precision equal
6974 to its width, rather than the precision of the specified standard
6975 type. (Correct layout requires the original type to have been preserved
6978 saw_named_field
= 0;
6979 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
6981 if (TREE_TYPE (x
) == error_mark_node
)
6984 DECL_CONTEXT (x
) = t
;
6986 /* If any field is const, the structure type is pseudo-const. */
6987 if (TREE_READONLY (x
))
6988 C_TYPE_FIELDS_READONLY (t
) = 1;
6991 /* A field that is pseudo-const makes the structure likewise. */
6992 tree t1
= strip_array_types (TREE_TYPE (x
));
6993 if ((TREE_CODE (t1
) == RECORD_TYPE
|| TREE_CODE (t1
) == UNION_TYPE
)
6994 && C_TYPE_FIELDS_READONLY (t1
))
6995 C_TYPE_FIELDS_READONLY (t
) = 1;
6998 /* Any field that is volatile means variables of this type must be
6999 treated in some ways as volatile. */
7000 if (TREE_THIS_VOLATILE (x
))
7001 C_TYPE_FIELDS_VOLATILE (t
) = 1;
7003 /* Any field of nominal variable size implies structure is too. */
7004 if (C_DECL_VARIABLE_SIZE (x
))
7005 C_TYPE_VARIABLE_SIZE (t
) = 1;
7007 if (DECL_INITIAL (x
))
7009 unsigned HOST_WIDE_INT width
= tree_low_cst (DECL_INITIAL (x
), 1);
7010 DECL_SIZE (x
) = bitsize_int (width
);
7011 DECL_BIT_FIELD (x
) = 1;
7012 SET_DECL_C_BIT_FIELD (x
);
7016 && (DECL_BIT_FIELD (x
)
7017 || TYPE_ALIGN (TREE_TYPE (x
)) > BITS_PER_UNIT
))
7018 DECL_PACKED (x
) = 1;
7020 /* Detect flexible array member in an invalid context. */
7021 if (TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
7022 && TYPE_SIZE (TREE_TYPE (x
)) == NULL_TREE
7023 && TYPE_DOMAIN (TREE_TYPE (x
)) != NULL_TREE
7024 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x
))) == NULL_TREE
)
7026 if (TREE_CODE (t
) == UNION_TYPE
)
7028 error_at (DECL_SOURCE_LOCATION (x
),
7029 "flexible array member in union");
7030 TREE_TYPE (x
) = error_mark_node
;
7032 else if (DECL_CHAIN (x
) != NULL_TREE
)
7034 error_at (DECL_SOURCE_LOCATION (x
),
7035 "flexible array member not at end of struct");
7036 TREE_TYPE (x
) = error_mark_node
;
7038 else if (!saw_named_field
)
7040 error_at (DECL_SOURCE_LOCATION (x
),
7041 "flexible array member in otherwise empty struct");
7042 TREE_TYPE (x
) = error_mark_node
;
7046 if (pedantic
&& TREE_CODE (t
) == RECORD_TYPE
7047 && flexible_array_type_p (TREE_TYPE (x
)))
7048 pedwarn (DECL_SOURCE_LOCATION (x
), OPT_pedantic
,
7049 "invalid use of structure with flexible array member");
7052 || TREE_CODE (TREE_TYPE (x
)) == RECORD_TYPE
7053 || TREE_CODE (TREE_TYPE (x
)) == UNION_TYPE
)
7054 saw_named_field
= 1;
7057 detect_field_duplicates (fieldlist
);
7059 /* Now we have the nearly final fieldlist. Record it,
7060 then lay out the structure or union (including the fields). */
7062 TYPE_FIELDS (t
) = fieldlist
;
7066 /* Give bit-fields their proper types. */
7068 tree
*fieldlistp
= &fieldlist
;
7070 if (TREE_CODE (*fieldlistp
) == FIELD_DECL
&& DECL_INITIAL (*fieldlistp
)
7071 && TREE_TYPE (*fieldlistp
) != error_mark_node
)
7073 unsigned HOST_WIDE_INT width
7074 = tree_low_cst (DECL_INITIAL (*fieldlistp
), 1);
7075 tree type
= TREE_TYPE (*fieldlistp
);
7076 if (width
!= TYPE_PRECISION (type
))
7078 TREE_TYPE (*fieldlistp
)
7079 = c_build_bitfield_integer_type (width
, TYPE_UNSIGNED (type
));
7080 DECL_MODE (*fieldlistp
) = TYPE_MODE (TREE_TYPE (*fieldlistp
));
7082 DECL_INITIAL (*fieldlistp
) = 0;
7085 fieldlistp
= &DECL_CHAIN (*fieldlistp
);
7088 /* Now we have the truly final field list.
7089 Store it in this type and in the variants. */
7091 TYPE_FIELDS (t
) = fieldlist
;
7093 /* If there are lots of fields, sort so we can look through them fast.
7094 We arbitrarily consider 16 or more elts to be "a lot". */
7099 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
7101 if (len
> 15 || DECL_NAME (x
) == NULL
)
7109 struct lang_type
*space
;
7110 struct sorted_fields_type
*space2
;
7112 len
+= list_length (x
);
7114 /* Use the same allocation policy here that make_node uses, to
7115 ensure that this lives as long as the rest of the struct decl.
7116 All decls in an inline function need to be saved. */
7118 space
= ggc_alloc_cleared_lang_type (sizeof (struct lang_type
));
7119 space2
= ggc_alloc_sorted_fields_type
7120 (sizeof (struct sorted_fields_type
) + len
* sizeof (tree
));
7124 field_array
= &space2
->elts
[0];
7125 for (x
= fieldlist
; x
; x
= DECL_CHAIN (x
))
7127 field_array
[len
++] = x
;
7129 /* If there is anonymous struct or union, break out of the loop. */
7130 if (DECL_NAME (x
) == NULL
)
7133 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
7136 TYPE_LANG_SPECIFIC (t
) = space
;
7137 TYPE_LANG_SPECIFIC (t
)->s
->len
= len
;
7138 field_array
= TYPE_LANG_SPECIFIC (t
)->s
->elts
;
7139 qsort (field_array
, len
, sizeof (tree
), field_decl_cmp
);
7144 for (x
= TYPE_MAIN_VARIANT (t
); x
; x
= TYPE_NEXT_VARIANT (x
))
7146 TYPE_FIELDS (x
) = TYPE_FIELDS (t
);
7147 TYPE_LANG_SPECIFIC (x
) = TYPE_LANG_SPECIFIC (t
);
7148 C_TYPE_FIELDS_READONLY (x
) = C_TYPE_FIELDS_READONLY (t
);
7149 C_TYPE_FIELDS_VOLATILE (x
) = C_TYPE_FIELDS_VOLATILE (t
);
7150 C_TYPE_VARIABLE_SIZE (x
) = C_TYPE_VARIABLE_SIZE (t
);
7153 /* If this was supposed to be a transparent union, but we can't
7154 make it one, warn and turn off the flag. */
7155 if (TREE_CODE (t
) == UNION_TYPE
7156 && TYPE_TRANSPARENT_AGGR (t
)
7157 && (!TYPE_FIELDS (t
) || TYPE_MODE (t
) != DECL_MODE (TYPE_FIELDS (t
))))
7159 TYPE_TRANSPARENT_AGGR (t
) = 0;
7160 warning_at (loc
, 0, "union cannot be made transparent");
7163 /* If this structure or union completes the type of any previous
7164 variable declaration, lay it out and output its rtl. */
7165 for (x
= C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t
));
7169 tree decl
= TREE_VALUE (x
);
7170 if (TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
)
7171 layout_array_type (TREE_TYPE (decl
));
7172 if (TREE_CODE (decl
) != TYPE_DECL
)
7174 layout_decl (decl
, 0);
7175 if (c_dialect_objc ())
7176 objc_check_decl (decl
);
7177 rest_of_decl_compilation (decl
, toplevel
, 0);
7182 C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t
)) = 0;
7184 /* Update type location to the one of the definition, instead of e.g.
7185 a forward declaration. */
7186 if (TYPE_STUB_DECL (t
))
7187 DECL_SOURCE_LOCATION (TYPE_STUB_DECL (t
)) = loc
;
7189 /* Finish debugging output for this type. */
7190 rest_of_type_compilation (t
, toplevel
);
7192 /* If we're inside a function proper, i.e. not file-scope and not still
7193 parsing parameters, then arrange for the size of a variable sized type
7195 if (cur_stmt_list
&& variably_modified_type_p (t
, NULL_TREE
))
7196 add_stmt (build_stmt (loc
,
7197 DECL_EXPR
, build_decl (loc
, TYPE_DECL
, NULL
, t
)));
7199 if (warn_cxx_compat
)
7200 warn_cxx_compat_finish_struct (fieldlist
);
7202 VEC_free (tree
, heap
, struct_parse_info
->struct_types
);
7203 VEC_free (c_binding_ptr
, heap
, struct_parse_info
->fields
);
7204 VEC_free (tree
, heap
, struct_parse_info
->typedefs_seen
);
7205 XDELETE (struct_parse_info
);
7207 struct_parse_info
= enclosing_struct_parse_info
;
7209 /* If this struct is defined inside a struct, add it to
7212 && struct_parse_info
!= NULL
7213 && !in_sizeof
&& !in_typeof
&& !in_alignof
)
7214 VEC_safe_push (tree
, heap
, struct_parse_info
->struct_types
, t
);
7219 /* Lay out the type T, and its element type, and so on. */
7222 layout_array_type (tree t
)
7224 if (TREE_CODE (TREE_TYPE (t
)) == ARRAY_TYPE
)
7225 layout_array_type (TREE_TYPE (t
));
7229 /* Begin compiling the definition of an enumeration type.
7230 NAME is its name (or null if anonymous).
7231 LOC is the enum's location.
7232 Returns the type object, as yet incomplete.
7233 Also records info about it so that build_enumerator
7234 may be used to declare the individual values as they are read. */
7237 start_enum (location_t loc
, struct c_enum_contents
*the_enum
, tree name
)
7239 tree enumtype
= NULL_TREE
;
7240 location_t enumloc
= UNKNOWN_LOCATION
;
7242 /* If this is the real definition for a previous forward reference,
7243 fill in the contents in the same object that used to be the
7244 forward reference. */
7246 if (name
!= NULL_TREE
)
7247 enumtype
= lookup_tag (ENUMERAL_TYPE
, name
, 1, &enumloc
);
7249 if (enumtype
== 0 || TREE_CODE (enumtype
) != ENUMERAL_TYPE
)
7251 enumtype
= make_node (ENUMERAL_TYPE
);
7252 pushtag (loc
, name
, enumtype
);
7255 if (C_TYPE_BEING_DEFINED (enumtype
))
7256 error_at (loc
, "nested redefinition of %<enum %E%>", name
);
7258 C_TYPE_BEING_DEFINED (enumtype
) = 1;
7260 if (TYPE_VALUES (enumtype
) != 0)
7262 /* This enum is a named one that has been declared already. */
7263 error_at (loc
, "redeclaration of %<enum %E%>", name
);
7264 if (enumloc
!= UNKNOWN_LOCATION
)
7265 inform (enumloc
, "originally defined here");
7267 /* Completely replace its old definition.
7268 The old enumerators remain defined, however. */
7269 TYPE_VALUES (enumtype
) = 0;
7272 the_enum
->enum_next_value
= integer_zero_node
;
7273 the_enum
->enum_overflow
= 0;
7275 if (flag_short_enums
)
7276 TYPE_PACKED (enumtype
) = 1;
7278 /* FIXME: This will issue a warning for a use of a type defined
7279 within sizeof in a statement expr. This is not terribly serious
7280 as C++ doesn't permit statement exprs within sizeof anyhow. */
7281 if (warn_cxx_compat
&& (in_sizeof
|| in_typeof
|| in_alignof
))
7282 warning_at (loc
, OPT_Wc___compat
,
7283 "defining type in %qs expression is invalid in C++",
7286 : (in_typeof
? "typeof" : "alignof")));
7291 /* After processing and defining all the values of an enumeration type,
7292 install their decls in the enumeration type and finish it off.
7293 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
7294 and ATTRIBUTES are the specified attributes.
7295 Returns ENUMTYPE. */
7298 finish_enum (tree enumtype
, tree values
, tree attributes
)
7301 tree minnode
= 0, maxnode
= 0;
7302 int precision
, unsign
;
7303 bool toplevel
= (file_scope
== current_scope
);
7304 struct lang_type
*lt
;
7306 decl_attributes (&enumtype
, attributes
, (int) ATTR_FLAG_TYPE_IN_PLACE
);
7308 /* Calculate the maximum value of any enumerator in this type. */
7310 if (values
== error_mark_node
)
7311 minnode
= maxnode
= integer_zero_node
;
7314 minnode
= maxnode
= TREE_VALUE (values
);
7315 for (pair
= TREE_CHAIN (values
); pair
; pair
= TREE_CHAIN (pair
))
7317 tree value
= TREE_VALUE (pair
);
7318 if (tree_int_cst_lt (maxnode
, value
))
7320 if (tree_int_cst_lt (value
, minnode
))
7325 /* Construct the final type of this enumeration. It is the same
7326 as one of the integral types - the narrowest one that fits, except
7327 that normally we only go as narrow as int - and signed iff any of
7328 the values are negative. */
7329 unsign
= (tree_int_cst_sgn (minnode
) >= 0);
7330 precision
= MAX (tree_int_cst_min_precision (minnode
, unsign
),
7331 tree_int_cst_min_precision (maxnode
, unsign
));
7333 if (TYPE_PACKED (enumtype
) || precision
> TYPE_PRECISION (integer_type_node
))
7335 tem
= c_common_type_for_size (precision
, unsign
);
7338 warning (0, "enumeration values exceed range of largest integer");
7339 tem
= long_long_integer_type_node
;
7343 tem
= unsign
? unsigned_type_node
: integer_type_node
;
7345 TYPE_MIN_VALUE (enumtype
) = TYPE_MIN_VALUE (tem
);
7346 TYPE_MAX_VALUE (enumtype
) = TYPE_MAX_VALUE (tem
);
7347 TYPE_UNSIGNED (enumtype
) = TYPE_UNSIGNED (tem
);
7348 TYPE_SIZE (enumtype
) = 0;
7350 /* If the precision of the type was specific with an attribute and it
7351 was too small, give an error. Otherwise, use it. */
7352 if (TYPE_PRECISION (enumtype
))
7354 if (precision
> TYPE_PRECISION (enumtype
))
7355 error ("specified mode too small for enumeral values");
7358 TYPE_PRECISION (enumtype
) = TYPE_PRECISION (tem
);
7360 layout_type (enumtype
);
7362 if (values
!= error_mark_node
)
7364 /* Change the type of the enumerators to be the enum type. We
7365 need to do this irrespective of the size of the enum, for
7366 proper type checking. Replace the DECL_INITIALs of the
7367 enumerators, and the value slots of the list, with copies
7368 that have the enum type; they cannot be modified in place
7369 because they may be shared (e.g. integer_zero_node) Finally,
7370 change the purpose slots to point to the names of the decls. */
7371 for (pair
= values
; pair
; pair
= TREE_CHAIN (pair
))
7373 tree enu
= TREE_PURPOSE (pair
);
7374 tree ini
= DECL_INITIAL (enu
);
7376 TREE_TYPE (enu
) = enumtype
;
7378 /* The ISO C Standard mandates enumerators to have type int,
7379 even though the underlying type of an enum type is
7380 unspecified. However, GCC allows enumerators of any
7381 integer type as an extensions. build_enumerator()
7382 converts any enumerators that fit in an int to type int,
7383 to avoid promotions to unsigned types when comparing
7384 integers with enumerators that fit in the int range.
7385 When -pedantic is given, build_enumerator() would have
7386 already warned about those that don't fit. Here we
7387 convert the rest to the enumerator type. */
7388 if (TREE_TYPE (ini
) != integer_type_node
)
7389 ini
= convert (enumtype
, ini
);
7391 DECL_INITIAL (enu
) = ini
;
7392 TREE_PURPOSE (pair
) = DECL_NAME (enu
);
7393 TREE_VALUE (pair
) = ini
;
7396 TYPE_VALUES (enumtype
) = values
;
7399 /* Record the min/max values so that we can warn about bit-field
7400 enumerations that are too small for the values. */
7401 lt
= ggc_alloc_cleared_lang_type (sizeof (struct lang_type
));
7402 lt
->enum_min
= minnode
;
7403 lt
->enum_max
= maxnode
;
7404 TYPE_LANG_SPECIFIC (enumtype
) = lt
;
7406 /* Fix up all variant types of this enum type. */
7407 for (tem
= TYPE_MAIN_VARIANT (enumtype
); tem
; tem
= TYPE_NEXT_VARIANT (tem
))
7409 if (tem
== enumtype
)
7411 TYPE_VALUES (tem
) = TYPE_VALUES (enumtype
);
7412 TYPE_MIN_VALUE (tem
) = TYPE_MIN_VALUE (enumtype
);
7413 TYPE_MAX_VALUE (tem
) = TYPE_MAX_VALUE (enumtype
);
7414 TYPE_SIZE (tem
) = TYPE_SIZE (enumtype
);
7415 TYPE_SIZE_UNIT (tem
) = TYPE_SIZE_UNIT (enumtype
);
7416 SET_TYPE_MODE (tem
, TYPE_MODE (enumtype
));
7417 TYPE_PRECISION (tem
) = TYPE_PRECISION (enumtype
);
7418 TYPE_ALIGN (tem
) = TYPE_ALIGN (enumtype
);
7419 TYPE_USER_ALIGN (tem
) = TYPE_USER_ALIGN (enumtype
);
7420 TYPE_UNSIGNED (tem
) = TYPE_UNSIGNED (enumtype
);
7421 TYPE_LANG_SPECIFIC (tem
) = TYPE_LANG_SPECIFIC (enumtype
);
7424 /* Finish debugging output for this type. */
7425 rest_of_type_compilation (enumtype
, toplevel
);
7427 /* If this enum is defined inside a struct, add it to
7430 && struct_parse_info
!= NULL
7431 && !in_sizeof
&& !in_typeof
&& !in_alignof
)
7432 VEC_safe_push (tree
, heap
, struct_parse_info
->struct_types
, enumtype
);
7437 /* Build and install a CONST_DECL for one value of the
7438 current enumeration type (one that was begun with start_enum).
7439 DECL_LOC is the location of the enumerator.
7440 LOC is the location of the '=' operator if any, DECL_LOC otherwise.
7441 Return a tree-list containing the CONST_DECL and its value.
7442 Assignment of sequential values by default is handled here. */
7445 build_enumerator (location_t decl_loc
, location_t loc
,
7446 struct c_enum_contents
*the_enum
, tree name
, tree value
)
7450 /* Validate and default VALUE. */
7454 /* Don't issue more errors for error_mark_node (i.e. an
7455 undeclared identifier) - just ignore the value expression. */
7456 if (value
== error_mark_node
)
7458 else if (!INTEGRAL_TYPE_P (TREE_TYPE (value
)))
7460 error_at (loc
, "enumerator value for %qE is not an integer constant",
7466 if (TREE_CODE (value
) != INTEGER_CST
)
7468 value
= c_fully_fold (value
, false, NULL
);
7469 if (TREE_CODE (value
) == INTEGER_CST
)
7470 pedwarn (loc
, OPT_pedantic
,
7471 "enumerator value for %qE is not an integer "
7472 "constant expression", name
);
7474 if (TREE_CODE (value
) != INTEGER_CST
)
7476 error ("enumerator value for %qE is not an integer constant",
7482 value
= default_conversion (value
);
7483 constant_expression_warning (value
);
7488 /* Default based on previous value. */
7489 /* It should no longer be possible to have NON_LVALUE_EXPR
7493 value
= the_enum
->enum_next_value
;
7494 if (the_enum
->enum_overflow
)
7495 error_at (loc
, "overflow in enumeration values");
7497 /* Even though the underlying type of an enum is unspecified, the
7498 type of enumeration constants is explicitly defined as int
7499 (6.4.4.3/2 in the C99 Standard). GCC allows any integer type as
7501 else if (!int_fits_type_p (value
, integer_type_node
))
7502 pedwarn (loc
, OPT_pedantic
,
7503 "ISO C restricts enumerator values to range of %<int%>");
7505 /* The ISO C Standard mandates enumerators to have type int, even
7506 though the underlying type of an enum type is unspecified.
7507 However, GCC allows enumerators of any integer type as an
7508 extensions. Here we convert any enumerators that fit in an int
7509 to type int, to avoid promotions to unsigned types when comparing
7510 integers with enumerators that fit in the int range. When
7511 -pedantic is given, we would have already warned about those that
7512 don't fit. We have to do this here rather than in finish_enum
7513 because this value may be used to define more enumerators. */
7514 if (int_fits_type_p (value
, integer_type_node
))
7515 value
= convert (integer_type_node
, value
);
7517 /* Set basis for default for next value. */
7518 the_enum
->enum_next_value
7519 = build_binary_op (EXPR_LOC_OR_HERE (value
),
7520 PLUS_EXPR
, value
, integer_one_node
, 0);
7521 the_enum
->enum_overflow
= tree_int_cst_lt (the_enum
->enum_next_value
, value
);
7523 /* Now create a declaration for the enum value name. */
7525 type
= TREE_TYPE (value
);
7526 type
= c_common_type_for_size (MAX (TYPE_PRECISION (type
),
7527 TYPE_PRECISION (integer_type_node
)),
7528 (TYPE_PRECISION (type
)
7529 >= TYPE_PRECISION (integer_type_node
)
7530 && TYPE_UNSIGNED (type
)));
7532 decl
= build_decl (decl_loc
, CONST_DECL
, name
, type
);
7533 DECL_INITIAL (decl
) = convert (type
, value
);
7536 return tree_cons (decl
, value
, NULL_TREE
);
7540 /* Create the FUNCTION_DECL for a function definition.
7541 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
7542 the declaration; they describe the function's name and the type it returns,
7543 but twisted together in a fashion that parallels the syntax of C.
7545 This function creates a binding context for the function body
7546 as well as setting up the FUNCTION_DECL in current_function_decl.
7548 Returns 1 on success. If the DECLARATOR is not suitable for a function
7549 (it defines a datum instead), we return 0, which tells
7550 yyparse to report a parse error. */
7553 start_function (struct c_declspecs
*declspecs
, struct c_declarator
*declarator
,
7556 tree decl1
, old_decl
;
7557 tree restype
, resdecl
;
7560 current_function_returns_value
= 0; /* Assume, until we see it does. */
7561 current_function_returns_null
= 0;
7562 current_function_returns_abnormally
= 0;
7563 warn_about_return_type
= 0;
7564 c_switch_stack
= NULL
;
7566 /* Indicate no valid break/continue context by setting these variables
7567 to some non-null, non-label value. We'll notice and emit the proper
7568 error message in c_finish_bc_stmt. */
7569 c_break_label
= c_cont_label
= size_zero_node
;
7571 decl1
= grokdeclarator (declarator
, declspecs
, FUNCDEF
, true, NULL
,
7572 &attributes
, NULL
, NULL
, DEPRECATED_NORMAL
);
7574 /* If the declarator is not suitable for a function definition,
7575 cause a syntax error. */
7579 loc
= DECL_SOURCE_LOCATION (decl1
);
7581 decl_attributes (&decl1
, attributes
, 0);
7583 if (DECL_DECLARED_INLINE_P (decl1
)
7584 && DECL_UNINLINABLE (decl1
)
7585 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1
)))
7586 warning_at (loc
, OPT_Wattributes
,
7587 "inline function %qD given attribute noinline",
7590 /* Handle gnu_inline attribute. */
7591 if (declspecs
->inline_p
7592 && !flag_gnu89_inline
7593 && TREE_CODE (decl1
) == FUNCTION_DECL
7594 && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl1
))
7595 || current_function_decl
))
7597 if (declspecs
->storage_class
!= csc_static
)
7598 DECL_EXTERNAL (decl1
) = !DECL_EXTERNAL (decl1
);
7601 announce_function (decl1
);
7603 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1
))))
7605 error_at (loc
, "return type is an incomplete type");
7606 /* Make it return void instead. */
7608 = build_function_type (void_type_node
,
7609 TYPE_ARG_TYPES (TREE_TYPE (decl1
)));
7612 if (warn_about_return_type
)
7613 pedwarn_c99 (loc
, flag_isoc99
? 0
7614 : (warn_return_type
? OPT_Wreturn_type
: OPT_Wimplicit_int
),
7615 "return type defaults to %<int%>");
7617 /* Make the init_value nonzero so pushdecl knows this is not tentative.
7618 error_mark_node is replaced below (in pop_scope) with the BLOCK. */
7619 DECL_INITIAL (decl1
) = error_mark_node
;
7621 /* A nested function is not global. */
7622 if (current_function_decl
!= 0)
7623 TREE_PUBLIC (decl1
) = 0;
7625 /* If this definition isn't a prototype and we had a prototype declaration
7626 before, copy the arg type info from that prototype. */
7627 old_decl
= lookup_name_in_scope (DECL_NAME (decl1
), current_scope
);
7628 if (old_decl
&& TREE_CODE (old_decl
) != FUNCTION_DECL
)
7630 current_function_prototype_locus
= UNKNOWN_LOCATION
;
7631 current_function_prototype_built_in
= false;
7632 current_function_prototype_arg_types
= NULL_TREE
;
7633 if (!prototype_p (TREE_TYPE (decl1
)))
7635 if (old_decl
!= 0 && TREE_CODE (TREE_TYPE (old_decl
)) == FUNCTION_TYPE
7636 && comptypes (TREE_TYPE (TREE_TYPE (decl1
)),
7637 TREE_TYPE (TREE_TYPE (old_decl
))))
7639 TREE_TYPE (decl1
) = composite_type (TREE_TYPE (old_decl
),
7641 current_function_prototype_locus
= DECL_SOURCE_LOCATION (old_decl
);
7642 current_function_prototype_built_in
7643 = C_DECL_BUILTIN_PROTOTYPE (old_decl
);
7644 current_function_prototype_arg_types
7645 = TYPE_ARG_TYPES (TREE_TYPE (decl1
));
7647 if (TREE_PUBLIC (decl1
))
7649 /* If there is an external prototype declaration of this
7650 function, record its location but do not copy information
7651 to this decl. This may be an invisible declaration
7652 (built-in or in a scope which has finished) or simply
7653 have more refined argument types than any declaration
7655 struct c_binding
*b
;
7656 for (b
= I_SYMBOL_BINDING (DECL_NAME (decl1
)); b
; b
= b
->shadowed
)
7657 if (B_IN_SCOPE (b
, external_scope
))
7661 tree ext_decl
, ext_type
;
7663 ext_type
= b
->u
.type
? b
->u
.type
: TREE_TYPE (ext_decl
);
7664 if (TREE_CODE (ext_type
) == FUNCTION_TYPE
7665 && comptypes (TREE_TYPE (TREE_TYPE (decl1
)),
7666 TREE_TYPE (ext_type
)))
7668 current_function_prototype_locus
7669 = DECL_SOURCE_LOCATION (ext_decl
);
7670 current_function_prototype_built_in
7671 = C_DECL_BUILTIN_PROTOTYPE (ext_decl
);
7672 current_function_prototype_arg_types
7673 = TYPE_ARG_TYPES (ext_type
);
7679 /* Optionally warn of old-fashioned def with no previous prototype. */
7680 if (warn_strict_prototypes
7681 && old_decl
!= error_mark_node
7682 && !prototype_p (TREE_TYPE (decl1
))
7683 && C_DECL_ISNT_PROTOTYPE (old_decl
))
7684 warning_at (loc
, OPT_Wstrict_prototypes
,
7685 "function declaration isn%'t a prototype");
7686 /* Optionally warn of any global def with no previous prototype. */
7687 else if (warn_missing_prototypes
7688 && old_decl
!= error_mark_node
7689 && TREE_PUBLIC (decl1
)
7690 && !MAIN_NAME_P (DECL_NAME (decl1
))
7691 && C_DECL_ISNT_PROTOTYPE (old_decl
))
7692 warning_at (loc
, OPT_Wmissing_prototypes
,
7693 "no previous prototype for %qD", decl1
);
7694 /* Optionally warn of any def with no previous prototype
7695 if the function has already been used. */
7696 else if (warn_missing_prototypes
7698 && old_decl
!= error_mark_node
7699 && TREE_USED (old_decl
)
7700 && !prototype_p (TREE_TYPE (old_decl
)))
7701 warning_at (loc
, OPT_Wmissing_prototypes
,
7702 "%qD was used with no prototype before its definition", decl1
);
7703 /* Optionally warn of any global def with no previous declaration. */
7704 else if (warn_missing_declarations
7705 && TREE_PUBLIC (decl1
)
7707 && !MAIN_NAME_P (DECL_NAME (decl1
)))
7708 warning_at (loc
, OPT_Wmissing_declarations
,
7709 "no previous declaration for %qD",
7711 /* Optionally warn of any def with no previous declaration
7712 if the function has already been used. */
7713 else if (warn_missing_declarations
7715 && old_decl
!= error_mark_node
7716 && TREE_USED (old_decl
)
7717 && C_DECL_IMPLICIT (old_decl
))
7718 warning_at (loc
, OPT_Wmissing_declarations
,
7719 "%qD was used with no declaration before its definition", decl1
);
7721 /* This function exists in static storage.
7722 (This does not mean `static' in the C sense!) */
7723 TREE_STATIC (decl1
) = 1;
7725 /* This is the earliest point at which we might know the assembler
7726 name of the function. Thus, if it's set before this, die horribly. */
7727 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl1
));
7729 /* If #pragma weak was used, mark the decl weak now. */
7730 if (current_scope
== file_scope
)
7731 maybe_apply_pragma_weak (decl1
);
7733 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
7734 if (warn_main
&& MAIN_NAME_P (DECL_NAME (decl1
)))
7736 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1
)))
7737 != integer_type_node
)
7738 pedwarn (loc
, OPT_Wmain
, "return type of %qD is not %<int%>", decl1
);
7740 check_main_parameter_types (decl1
);
7742 if (!TREE_PUBLIC (decl1
))
7743 pedwarn (loc
, OPT_Wmain
,
7744 "%qD is normally a non-static function", decl1
);
7747 /* Record the decl so that the function name is defined.
7748 If we already have a decl for this name, and it is a FUNCTION_DECL,
7749 use the old decl. */
7751 current_function_decl
= pushdecl (decl1
);
7754 declare_parm_level ();
7756 restype
= TREE_TYPE (TREE_TYPE (current_function_decl
));
7757 resdecl
= build_decl (loc
, RESULT_DECL
, NULL_TREE
, restype
);
7758 DECL_ARTIFICIAL (resdecl
) = 1;
7759 DECL_IGNORED_P (resdecl
) = 1;
7760 DECL_RESULT (current_function_decl
) = resdecl
;
7762 start_fname_decls ();
7767 /* Subroutine of store_parm_decls which handles new-style function
7768 definitions (prototype format). The parms already have decls, so we
7769 need only record them as in effect and complain if any redundant
7770 old-style parm decls were written. */
7772 store_parm_decls_newstyle (tree fndecl
, const struct c_arg_info
*arg_info
)
7778 if (current_scope
->bindings
)
7780 error_at (DECL_SOURCE_LOCATION (fndecl
),
7781 "old-style parameter declarations in prototyped "
7782 "function definition");
7784 /* Get rid of the old-style declarations. */
7788 /* Don't issue this warning for nested functions, and don't issue this
7789 warning if we got here because ARG_INFO_TYPES was error_mark_node
7790 (this happens when a function definition has just an ellipsis in
7791 its parameter list). */
7792 else if (!in_system_header
&& !current_function_scope
7793 && arg_info
->types
!= error_mark_node
)
7794 warning_at (DECL_SOURCE_LOCATION (fndecl
), OPT_Wtraditional
,
7795 "traditional C rejects ISO C style function definitions");
7797 /* Now make all the parameter declarations visible in the function body.
7798 We can bypass most of the grunt work of pushdecl. */
7799 for (decl
= arg_info
->parms
; decl
; decl
= DECL_CHAIN (decl
))
7801 DECL_CONTEXT (decl
) = current_function_decl
;
7802 if (DECL_NAME (decl
))
7804 bind (DECL_NAME (decl
), decl
, current_scope
,
7805 /*invisible=*/false, /*nested=*/false,
7807 if (!TREE_USED (decl
))
7808 warn_if_shadowing (decl
);
7811 error_at (DECL_SOURCE_LOCATION (decl
), "parameter name omitted");
7814 /* Record the parameter list in the function declaration. */
7815 DECL_ARGUMENTS (fndecl
) = arg_info
->parms
;
7817 /* Now make all the ancillary declarations visible, likewise. */
7818 for (decl
= arg_info
->others
; decl
; decl
= DECL_CHAIN (decl
))
7820 DECL_CONTEXT (decl
) = current_function_decl
;
7821 if (DECL_NAME (decl
))
7822 bind (DECL_NAME (decl
), decl
, current_scope
,
7823 /*invisible=*/false,
7824 /*nested=*/(TREE_CODE (decl
) == FUNCTION_DECL
),
7828 /* And all the tag declarations. */
7829 FOR_EACH_VEC_ELT_REVERSE (c_arg_tag
, arg_info
->tags
, ix
, tag
)
7831 bind (tag
->id
, tag
->type
, current_scope
,
7832 /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION
);
7835 /* Subroutine of store_parm_decls which handles old-style function
7836 definitions (separate parameter list and declarations). */
7839 store_parm_decls_oldstyle (tree fndecl
, const struct c_arg_info
*arg_info
)
7841 struct c_binding
*b
;
7842 tree parm
, decl
, last
;
7843 tree parmids
= arg_info
->parms
;
7844 struct pointer_set_t
*seen_args
= pointer_set_create ();
7846 if (!in_system_header
)
7847 warning_at (DECL_SOURCE_LOCATION (fndecl
),
7848 OPT_Wold_style_definition
, "old-style function definition");
7850 /* Match each formal parameter name with its declaration. Save each
7851 decl in the appropriate TREE_PURPOSE slot of the parmids chain. */
7852 for (parm
= parmids
; parm
; parm
= TREE_CHAIN (parm
))
7854 if (TREE_VALUE (parm
) == 0)
7856 error_at (DECL_SOURCE_LOCATION (fndecl
),
7857 "parameter name missing from parameter list");
7858 TREE_PURPOSE (parm
) = 0;
7862 b
= I_SYMBOL_BINDING (TREE_VALUE (parm
));
7863 if (b
&& B_IN_CURRENT_SCOPE (b
))
7866 /* Skip erroneous parameters. */
7867 if (decl
== error_mark_node
)
7869 /* If we got something other than a PARM_DECL it is an error. */
7870 if (TREE_CODE (decl
) != PARM_DECL
)
7871 error_at (DECL_SOURCE_LOCATION (decl
),
7872 "%qD declared as a non-parameter", decl
);
7873 /* If the declaration is already marked, we have a duplicate
7874 name. Complain and ignore the duplicate. */
7875 else if (pointer_set_contains (seen_args
, decl
))
7877 error_at (DECL_SOURCE_LOCATION (decl
),
7878 "multiple parameters named %qD", decl
);
7879 TREE_PURPOSE (parm
) = 0;
7882 /* If the declaration says "void", complain and turn it into
7884 else if (VOID_TYPE_P (TREE_TYPE (decl
)))
7886 error_at (DECL_SOURCE_LOCATION (decl
),
7887 "parameter %qD declared with void type", decl
);
7888 TREE_TYPE (decl
) = integer_type_node
;
7889 DECL_ARG_TYPE (decl
) = integer_type_node
;
7890 layout_decl (decl
, 0);
7892 warn_if_shadowing (decl
);
7894 /* If no declaration found, default to int. */
7897 /* FIXME diagnostics: This should be the location of the argument,
7898 not the FNDECL. E.g., for an old-style declaration
7900 int f10(v) { blah; }
7902 We should use the location of the V, not the F10.
7903 Unfortunately, the V is an IDENTIFIER_NODE which has no
7904 location. In the future we need locations for c_arg_info
7907 See gcc.dg/Wshadow-3.c for an example of this problem. */
7908 decl
= build_decl (DECL_SOURCE_LOCATION (fndecl
),
7909 PARM_DECL
, TREE_VALUE (parm
), integer_type_node
);
7910 DECL_ARG_TYPE (decl
) = TREE_TYPE (decl
);
7912 warn_if_shadowing (decl
);
7915 pedwarn (DECL_SOURCE_LOCATION (decl
),
7916 0, "type of %qD defaults to %<int%>", decl
);
7918 warning_at (DECL_SOURCE_LOCATION (decl
),
7919 OPT_Wmissing_parameter_type
,
7920 "type of %qD defaults to %<int%>", decl
);
7923 TREE_PURPOSE (parm
) = decl
;
7924 pointer_set_insert (seen_args
, decl
);
7927 /* Now examine the parms chain for incomplete declarations
7928 and declarations with no corresponding names. */
7930 for (b
= current_scope
->bindings
; b
; b
= b
->prev
)
7933 if (TREE_CODE (parm
) != PARM_DECL
)
7936 if (TREE_TYPE (parm
) != error_mark_node
7937 && !COMPLETE_TYPE_P (TREE_TYPE (parm
)))
7939 error_at (DECL_SOURCE_LOCATION (parm
),
7940 "parameter %qD has incomplete type", parm
);
7941 TREE_TYPE (parm
) = error_mark_node
;
7944 if (!pointer_set_contains (seen_args
, parm
))
7946 error_at (DECL_SOURCE_LOCATION (parm
),
7947 "declaration for parameter %qD but no such parameter",
7950 /* Pretend the parameter was not missing.
7951 This gets us to a standard state and minimizes
7952 further error messages. */
7953 parmids
= chainon (parmids
, tree_cons (parm
, 0, 0));
7957 /* Chain the declarations together in the order of the list of
7958 names. Store that chain in the function decl, replacing the
7959 list of names. Update the current scope to match. */
7960 DECL_ARGUMENTS (fndecl
) = 0;
7962 for (parm
= parmids
; parm
; parm
= TREE_CHAIN (parm
))
7963 if (TREE_PURPOSE (parm
))
7965 if (parm
&& TREE_PURPOSE (parm
))
7967 last
= TREE_PURPOSE (parm
);
7968 DECL_ARGUMENTS (fndecl
) = last
;
7970 for (parm
= TREE_CHAIN (parm
); parm
; parm
= TREE_CHAIN (parm
))
7971 if (TREE_PURPOSE (parm
))
7973 DECL_CHAIN (last
) = TREE_PURPOSE (parm
);
7974 last
= TREE_PURPOSE (parm
);
7976 DECL_CHAIN (last
) = 0;
7979 pointer_set_destroy (seen_args
);
7981 /* If there was a previous prototype,
7982 set the DECL_ARG_TYPE of each argument according to
7983 the type previously specified, and report any mismatches. */
7985 if (current_function_prototype_arg_types
)
7988 for (parm
= DECL_ARGUMENTS (fndecl
),
7989 type
= current_function_prototype_arg_types
;
7990 parm
|| (type
&& TREE_VALUE (type
) != error_mark_node
7991 && (TYPE_MAIN_VARIANT (TREE_VALUE (type
)) != void_type_node
));
7992 parm
= DECL_CHAIN (parm
), type
= TREE_CHAIN (type
))
7994 if (parm
== 0 || type
== 0
7995 || TYPE_MAIN_VARIANT (TREE_VALUE (type
)) == void_type_node
)
7997 if (current_function_prototype_built_in
)
7998 warning_at (DECL_SOURCE_LOCATION (fndecl
),
7999 0, "number of arguments doesn%'t match "
8000 "built-in prototype");
8003 /* FIXME diagnostics: This should be the location of
8004 FNDECL, but there is bug when a prototype is
8005 declared inside function context, but defined
8006 outside of it (e.g., gcc.dg/pr15698-2.c). In
8007 which case FNDECL gets the location of the
8008 prototype, not the definition. */
8009 error_at (input_location
,
8010 "number of arguments doesn%'t match prototype");
8012 error_at (current_function_prototype_locus
,
8013 "prototype declaration");
8017 /* Type for passing arg must be consistent with that
8018 declared for the arg. ISO C says we take the unqualified
8019 type for parameters declared with qualified type. */
8020 if (TREE_TYPE (parm
) != error_mark_node
8021 && TREE_TYPE (type
) != error_mark_node
8022 && !comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm
)),
8023 TYPE_MAIN_VARIANT (TREE_VALUE (type
))))
8025 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm
))
8026 == TYPE_MAIN_VARIANT (TREE_VALUE (type
)))
8028 /* Adjust argument to match prototype. E.g. a previous
8029 `int foo(float);' prototype causes
8030 `int foo(x) float x; {...}' to be treated like
8031 `int foo(float x) {...}'. This is particularly
8032 useful for argument types like uid_t. */
8033 DECL_ARG_TYPE (parm
) = TREE_TYPE (parm
);
8035 if (targetm
.calls
.promote_prototypes (TREE_TYPE (current_function_decl
))
8036 && INTEGRAL_TYPE_P (TREE_TYPE (parm
))
8037 && TYPE_PRECISION (TREE_TYPE (parm
))
8038 < TYPE_PRECISION (integer_type_node
))
8039 DECL_ARG_TYPE (parm
) = integer_type_node
;
8041 /* ??? Is it possible to get here with a
8042 built-in prototype or will it always have
8043 been diagnosed as conflicting with an
8044 old-style definition and discarded? */
8045 if (current_function_prototype_built_in
)
8046 warning_at (DECL_SOURCE_LOCATION (parm
),
8047 OPT_pedantic
, "promoted argument %qD "
8048 "doesn%'t match built-in prototype", parm
);
8051 pedwarn (DECL_SOURCE_LOCATION (parm
),
8052 OPT_pedantic
, "promoted argument %qD "
8053 "doesn%'t match prototype", parm
);
8054 pedwarn (current_function_prototype_locus
, OPT_pedantic
,
8055 "prototype declaration");
8060 if (current_function_prototype_built_in
)
8061 warning_at (DECL_SOURCE_LOCATION (parm
),
8062 0, "argument %qD doesn%'t match "
8063 "built-in prototype", parm
);
8066 error_at (DECL_SOURCE_LOCATION (parm
),
8067 "argument %qD doesn%'t match prototype", parm
);
8068 error_at (current_function_prototype_locus
,
8069 "prototype declaration");
8074 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl
)) = 0;
8077 /* Otherwise, create a prototype that would match. */
8081 tree actual
= 0, last
= 0, type
;
8083 for (parm
= DECL_ARGUMENTS (fndecl
); parm
; parm
= DECL_CHAIN (parm
))
8085 type
= tree_cons (NULL_TREE
, DECL_ARG_TYPE (parm
), NULL_TREE
);
8087 TREE_CHAIN (last
) = type
;
8092 type
= tree_cons (NULL_TREE
, void_type_node
, NULL_TREE
);
8094 TREE_CHAIN (last
) = type
;
8098 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
8099 of the type of this function, but we need to avoid having this
8100 affect the types of other similarly-typed functions, so we must
8101 first force the generation of an identical (but separate) type
8102 node for the relevant function type. The new node we create
8103 will be a variant of the main variant of the original function
8106 TREE_TYPE (fndecl
) = build_variant_type_copy (TREE_TYPE (fndecl
));
8108 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl
)) = actual
;
8112 /* Store parameter declarations passed in ARG_INFO into the current
8113 function declaration. */
8116 store_parm_decls_from (struct c_arg_info
*arg_info
)
8118 current_function_arg_info
= arg_info
;
8119 store_parm_decls ();
8122 /* Store the parameter declarations into the current function declaration.
8123 This is called after parsing the parameter declarations, before
8124 digesting the body of the function.
8126 For an old-style definition, construct a prototype out of the old-style
8127 parameter declarations and inject it into the function's type. */
8130 store_parm_decls (void)
8132 tree fndecl
= current_function_decl
;
8135 /* The argument information block for FNDECL. */
8136 struct c_arg_info
*arg_info
= current_function_arg_info
;
8137 current_function_arg_info
= 0;
8139 /* True if this definition is written with a prototype. Note:
8140 despite C99 6.7.5.3p14, we can *not* treat an empty argument
8141 list in a function definition as equivalent to (void) -- an
8142 empty argument list specifies the function has no parameters,
8143 but only (void) sets up a prototype for future calls. */
8144 proto
= arg_info
->types
!= 0;
8147 store_parm_decls_newstyle (fndecl
, arg_info
);
8149 store_parm_decls_oldstyle (fndecl
, arg_info
);
8151 /* The next call to push_scope will be a function body. */
8153 next_is_function_body
= true;
8155 /* Write a record describing this function definition to the prototypes
8156 file (if requested). */
8158 gen_aux_info_record (fndecl
, 1, 0, proto
);
8160 /* Initialize the RTL code for the function. */
8161 allocate_struct_function (fndecl
, false);
8163 /* Begin the statement tree for this function. */
8164 DECL_SAVED_TREE (fndecl
) = push_stmt_list ();
8166 /* ??? Insert the contents of the pending sizes list into the function
8167 to be evaluated. The only reason left to have this is
8168 void foo(int n, int array[n++])
8169 because we throw away the array type in favor of a pointer type, and
8170 thus won't naturally see the SAVE_EXPR containing the increment. All
8171 other pending sizes would be handled by gimplify_parameters. */
8172 if (arg_info
->pending_sizes
)
8173 add_stmt (arg_info
->pending_sizes
);
8177 /* Finish up a function declaration and compile that function
8178 all the way to assembler language output. Then free the storage
8179 for the function definition.
8181 This is called after parsing the body of the function definition. */
8184 finish_function (void)
8186 tree fndecl
= current_function_decl
;
8188 if (c_dialect_objc ())
8189 objc_finish_function ();
8191 if (TREE_CODE (fndecl
) == FUNCTION_DECL
8192 && targetm
.calls
.promote_prototypes (TREE_TYPE (fndecl
)))
8194 tree args
= DECL_ARGUMENTS (fndecl
);
8195 for (; args
; args
= DECL_CHAIN (args
))
8197 tree type
= TREE_TYPE (args
);
8198 if (INTEGRAL_TYPE_P (type
)
8199 && TYPE_PRECISION (type
) < TYPE_PRECISION (integer_type_node
))
8200 DECL_ARG_TYPE (args
) = integer_type_node
;
8204 if (DECL_INITIAL (fndecl
) && DECL_INITIAL (fndecl
) != error_mark_node
)
8205 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl
)) = fndecl
;
8207 /* Must mark the RESULT_DECL as being in this function. */
8209 if (DECL_RESULT (fndecl
) && DECL_RESULT (fndecl
) != error_mark_node
)
8210 DECL_CONTEXT (DECL_RESULT (fndecl
)) = fndecl
;
8212 if (MAIN_NAME_P (DECL_NAME (fndecl
)) && flag_hosted
8213 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl
)))
8214 == integer_type_node
&& flag_isoc99
)
8216 /* Hack. We don't want the middle-end to warn that this return
8217 is unreachable, so we mark its location as special. Using
8218 UNKNOWN_LOCATION has the problem that it gets clobbered in
8219 annotate_one_with_locus. A cleaner solution might be to
8220 ensure ! should_carry_locus_p (stmt), but that needs a flag.
8222 c_finish_return (BUILTINS_LOCATION
, integer_zero_node
, NULL_TREE
);
8225 /* Tie off the statement tree for this function. */
8226 DECL_SAVED_TREE (fndecl
) = pop_stmt_list (DECL_SAVED_TREE (fndecl
));
8228 finish_fname_decls ();
8230 /* Complain if there's just no return statement. */
8231 if (warn_return_type
8232 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl
))) != VOID_TYPE
8233 && !current_function_returns_value
&& !current_function_returns_null
8234 /* Don't complain if we are no-return. */
8235 && !current_function_returns_abnormally
8236 /* Don't complain if we are declared noreturn. */
8237 && !TREE_THIS_VOLATILE (fndecl
)
8238 /* Don't warn for main(). */
8239 && !MAIN_NAME_P (DECL_NAME (fndecl
))
8240 /* Or if they didn't actually specify a return type. */
8241 && !C_FUNCTION_IMPLICIT_INT (fndecl
)
8242 /* Normally, with -Wreturn-type, flow will complain, but we might
8243 optimize out static functions. */
8244 && !TREE_PUBLIC (fndecl
))
8246 warning (OPT_Wreturn_type
,
8247 "no return statement in function returning non-void");
8248 TREE_NO_WARNING (fndecl
) = 1;
8251 /* Complain about parameters that are only set, but never otherwise used. */
8252 if (warn_unused_but_set_parameter
)
8256 for (decl
= DECL_ARGUMENTS (fndecl
);
8258 decl
= DECL_CHAIN (decl
))
8259 if (TREE_USED (decl
)
8260 && TREE_CODE (decl
) == PARM_DECL
8261 && !DECL_READ_P (decl
)
8263 && !DECL_ARTIFICIAL (decl
)
8264 && !TREE_NO_WARNING (decl
))
8265 warning_at (DECL_SOURCE_LOCATION (decl
),
8266 OPT_Wunused_but_set_parameter
,
8267 "parameter %qD set but not used", decl
);
8270 /* Store the end of the function, so that we get good line number
8271 info for the epilogue. */
8272 cfun
->function_end_locus
= input_location
;
8274 /* Finalize the ELF visibility for the function. */
8275 c_determine_visibility (fndecl
);
8277 /* For GNU C extern inline functions disregard inline limits. */
8278 if (DECL_EXTERNAL (fndecl
)
8279 && DECL_DECLARED_INLINE_P (fndecl
))
8280 DECL_DISREGARD_INLINE_LIMITS (fndecl
) = 1;
8282 /* Genericize before inlining. Delay genericizing nested functions
8283 until their parent function is genericized. Since finalizing
8284 requires GENERIC, delay that as well. */
8286 if (DECL_INITIAL (fndecl
) && DECL_INITIAL (fndecl
) != error_mark_node
8287 && !undef_nested_function
)
8289 if (!decl_function_context (fndecl
))
8291 invoke_plugin_callbacks (PLUGIN_PRE_GENERICIZE
, fndecl
);
8292 c_genericize (fndecl
);
8294 /* ??? Objc emits functions after finalizing the compilation unit.
8295 This should be cleaned up later and this conditional removed. */
8296 if (cgraph_global_info_ready
)
8298 cgraph_add_new_function (fndecl
, false);
8301 cgraph_finalize_function (fndecl
, false);
8305 /* Register this function with cgraph just far enough to get it
8306 added to our parent's nested function list. Handy, since the
8307 C front end doesn't have such a list. */
8308 (void) cgraph_get_create_node (fndecl
);
8312 if (!decl_function_context (fndecl
))
8313 undef_nested_function
= false;
8315 /* We're leaving the context of this function, so zap cfun.
8316 It's still in DECL_STRUCT_FUNCTION, and we'll restore it in
8317 tree_rest_of_compilation. */
8319 current_function_decl
= NULL
;
8322 /* Check the declarations given in a for-loop for satisfying the C99
8323 constraints. If exactly one such decl is found, return it. LOC is
8324 the location of the opening parenthesis of the for loop. The last
8325 parameter allows you to control the "for loop initial declarations
8326 are only allowed in C99 mode". Normally, you should pass
8327 flag_isoc99 as that parameter. But in some cases (Objective-C
8328 foreach loop, for example) we want to run the checks in this
8329 function even if not in C99 mode, so we allow the caller to turn
8330 off the error about not being in C99 mode.
8334 check_for_loop_decls (location_t loc
, bool turn_off_iso_c99_error
)
8336 struct c_binding
*b
;
8337 tree one_decl
= NULL_TREE
;
8340 if (!turn_off_iso_c99_error
)
8342 static bool hint
= true;
8343 /* If we get here, declarations have been used in a for loop without
8344 the C99 for loop scope. This doesn't make much sense, so don't
8346 error_at (loc
, "%<for%> loop initial declarations "
8347 "are only allowed in C99 mode");
8351 "use option -std=c99 or -std=gnu99 to compile your code");
8356 /* C99 subclause 6.8.5 paragraph 3:
8358 [#3] The declaration part of a for statement shall only
8359 declare identifiers for objects having storage class auto or
8362 It isn't clear whether, in this sentence, "identifiers" binds to
8363 "shall only declare" or to "objects" - that is, whether all identifiers
8364 declared must be identifiers for objects, or whether the restriction
8365 only applies to those that are. (A question on this in comp.std.c
8366 in November 2000 received no answer.) We implement the strictest
8367 interpretation, to avoid creating an extension which later causes
8370 for (b
= current_scope
->bindings
; b
; b
= b
->prev
)
8373 tree decl
= b
->decl
;
8378 switch (TREE_CODE (decl
))
8382 location_t decl_loc
= DECL_SOURCE_LOCATION (decl
);
8383 if (TREE_STATIC (decl
))
8385 "declaration of static variable %qD in %<for%> loop "
8386 "initial declaration", decl
);
8387 else if (DECL_EXTERNAL (decl
))
8389 "declaration of %<extern%> variable %qD in %<for%> loop "
8390 "initial declaration", decl
);
8396 "%<struct %E%> declared in %<for%> loop initial "
8401 "%<union %E%> declared in %<for%> loop initial declaration",
8405 error_at (loc
, "%<enum %E%> declared in %<for%> loop "
8406 "initial declaration", id
);
8409 error_at (loc
, "declaration of non-variable "
8410 "%qD in %<for%> loop initial declaration", decl
);
8417 return n_decls
== 1 ? one_decl
: NULL_TREE
;
8420 /* Save and reinitialize the variables
8421 used during compilation of a C function. */
8424 c_push_function_context (void)
8426 struct language_function
*p
;
8427 p
= ggc_alloc_language_function ();
8430 p
->base
.x_stmt_tree
= c_stmt_tree
;
8431 p
->x_break_label
= c_break_label
;
8432 p
->x_cont_label
= c_cont_label
;
8433 p
->x_switch_stack
= c_switch_stack
;
8434 p
->arg_info
= current_function_arg_info
;
8435 p
->returns_value
= current_function_returns_value
;
8436 p
->returns_null
= current_function_returns_null
;
8437 p
->returns_abnormally
= current_function_returns_abnormally
;
8438 p
->warn_about_return_type
= warn_about_return_type
;
8440 push_function_context ();
8443 /* Restore the variables used during compilation of a C function. */
8446 c_pop_function_context (void)
8448 struct language_function
*p
;
8450 pop_function_context ();
8452 cfun
->language
= NULL
;
8454 if (DECL_STRUCT_FUNCTION (current_function_decl
) == 0
8455 && DECL_SAVED_TREE (current_function_decl
) == NULL_TREE
)
8457 /* Stop pointing to the local nodes about to be freed. */
8458 /* But DECL_INITIAL must remain nonzero so we know this
8459 was an actual function definition. */
8460 DECL_INITIAL (current_function_decl
) = error_mark_node
;
8461 DECL_ARGUMENTS (current_function_decl
) = 0;
8464 c_stmt_tree
= p
->base
.x_stmt_tree
;
8465 c_break_label
= p
->x_break_label
;
8466 c_cont_label
= p
->x_cont_label
;
8467 c_switch_stack
= p
->x_switch_stack
;
8468 current_function_arg_info
= p
->arg_info
;
8469 current_function_returns_value
= p
->returns_value
;
8470 current_function_returns_null
= p
->returns_null
;
8471 current_function_returns_abnormally
= p
->returns_abnormally
;
8472 warn_about_return_type
= p
->warn_about_return_type
;
8475 /* The functions below are required for functionality of doing
8476 function at once processing in the C front end. Currently these
8477 functions are not called from anywhere in the C front end, but as
8478 these changes continue, that will change. */
8480 /* Returns the stmt_tree (if any) to which statements are currently
8481 being added. If there is no active statement-tree, NULL is
8485 current_stmt_tree (void)
8487 return &c_stmt_tree
;
8490 /* Return the global value of T as a symbol. */
8493 identifier_global_value (tree t
)
8495 struct c_binding
*b
;
8497 for (b
= I_SYMBOL_BINDING (t
); b
; b
= b
->shadowed
)
8498 if (B_IN_FILE_SCOPE (b
) || B_IN_EXTERNAL_SCOPE (b
))
8504 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
8505 otherwise the name is found in ridpointers from RID_INDEX. */
8508 record_builtin_type (enum rid rid_index
, const char *name
, tree type
)
8512 id
= ridpointers
[(int) rid_index
];
8514 id
= get_identifier (name
);
8515 decl
= build_decl (UNKNOWN_LOCATION
, TYPE_DECL
, id
, type
);
8517 if (debug_hooks
->type_decl
)
8518 debug_hooks
->type_decl (decl
, false);
8521 /* Build the void_list_node (void_type_node having been created). */
8523 build_void_list_node (void)
8525 tree t
= build_tree_list (NULL_TREE
, void_type_node
);
8529 /* Return a c_parm structure with the given SPECS, ATTRS and DECLARATOR. */
8532 build_c_parm (struct c_declspecs
*specs
, tree attrs
,
8533 struct c_declarator
*declarator
)
8535 struct c_parm
*ret
= XOBNEW (&parser_obstack
, struct c_parm
);
8538 ret
->declarator
= declarator
;
8542 /* Return a declarator with nested attributes. TARGET is the inner
8543 declarator to which these attributes apply. ATTRS are the
8546 struct c_declarator
*
8547 build_attrs_declarator (tree attrs
, struct c_declarator
*target
)
8549 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
8550 ret
->kind
= cdk_attrs
;
8551 ret
->declarator
= target
;
8552 ret
->u
.attrs
= attrs
;
8556 /* Return a declarator for a function with arguments specified by ARGS
8557 and return type specified by TARGET. */
8559 struct c_declarator
*
8560 build_function_declarator (struct c_arg_info
*args
,
8561 struct c_declarator
*target
)
8563 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
8564 ret
->kind
= cdk_function
;
8565 ret
->declarator
= target
;
8566 ret
->u
.arg_info
= args
;
8570 /* Return a declarator for the identifier IDENT (which may be
8571 NULL_TREE for an abstract declarator). */
8573 struct c_declarator
*
8574 build_id_declarator (tree ident
)
8576 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
8578 ret
->declarator
= 0;
8580 /* Default value - may get reset to a more precise location. */
8581 ret
->id_loc
= input_location
;
8585 /* Return something to represent absolute declarators containing a *.
8586 TARGET is the absolute declarator that the * contains.
8587 TYPE_QUALS_ATTRS is a structure for type qualifiers and attributes
8588 to apply to the pointer type. */
8590 struct c_declarator
*
8591 make_pointer_declarator (struct c_declspecs
*type_quals_attrs
,
8592 struct c_declarator
*target
)
8596 struct c_declarator
*itarget
= target
;
8597 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
8598 if (type_quals_attrs
)
8600 attrs
= type_quals_attrs
->attrs
;
8601 quals
= quals_from_declspecs (type_quals_attrs
);
8602 if (attrs
!= NULL_TREE
)
8603 itarget
= build_attrs_declarator (attrs
, target
);
8605 ret
->kind
= cdk_pointer
;
8606 ret
->declarator
= itarget
;
8607 ret
->u
.pointer_quals
= quals
;
8611 /* Return a pointer to a structure for an empty list of declaration
8614 struct c_declspecs
*
8615 build_null_declspecs (void)
8617 struct c_declspecs
*ret
= XOBNEW (&parser_obstack
, struct c_declspecs
);
8622 ret
->typespec_word
= cts_none
;
8623 ret
->storage_class
= csc_none
;
8624 ret
->expr_const_operands
= true;
8625 ret
->declspecs_seen_p
= false;
8626 ret
->typespec_kind
= ctsk_none
;
8627 ret
->non_sc_seen_p
= false;
8628 ret
->typedef_p
= false;
8629 ret
->explicit_signed_p
= false;
8630 ret
->deprecated_p
= false;
8631 ret
->default_int_p
= false;
8632 ret
->long_p
= false;
8633 ret
->long_long_p
= false;
8634 ret
->short_p
= false;
8635 ret
->signed_p
= false;
8636 ret
->unsigned_p
= false;
8637 ret
->complex_p
= false;
8638 ret
->inline_p
= false;
8639 ret
->thread_p
= false;
8640 ret
->const_p
= false;
8641 ret
->volatile_p
= false;
8642 ret
->restrict_p
= false;
8643 ret
->saturating_p
= false;
8644 ret
->address_space
= ADDR_SPACE_GENERIC
;
8648 /* Add the address space ADDRSPACE to the declaration specifiers
8649 SPECS, returning SPECS. */
8651 struct c_declspecs
*
8652 declspecs_add_addrspace (struct c_declspecs
*specs
, addr_space_t as
)
8654 specs
->non_sc_seen_p
= true;
8655 specs
->declspecs_seen_p
= true;
8657 if (!ADDR_SPACE_GENERIC_P (specs
->address_space
)
8658 && specs
->address_space
!= as
)
8659 error ("incompatible address space qualifiers %qs and %qs",
8660 c_addr_space_name (as
),
8661 c_addr_space_name (specs
->address_space
));
8663 specs
->address_space
= as
;
8667 /* Add the type qualifier QUAL to the declaration specifiers SPECS,
8670 struct c_declspecs
*
8671 declspecs_add_qual (struct c_declspecs
*specs
, tree qual
)
8675 specs
->non_sc_seen_p
= true;
8676 specs
->declspecs_seen_p
= true;
8677 gcc_assert (TREE_CODE (qual
) == IDENTIFIER_NODE
8678 && C_IS_RESERVED_WORD (qual
));
8679 i
= C_RID_CODE (qual
);
8683 dupe
= specs
->const_p
;
8684 specs
->const_p
= true;
8687 dupe
= specs
->volatile_p
;
8688 specs
->volatile_p
= true;
8691 dupe
= specs
->restrict_p
;
8692 specs
->restrict_p
= true;
8697 if (dupe
&& !flag_isoc99
)
8698 pedwarn (input_location
, OPT_pedantic
, "duplicate %qE", qual
);
8702 /* Add the type specifier TYPE to the declaration specifiers SPECS,
8705 struct c_declspecs
*
8706 declspecs_add_type (location_t loc
, struct c_declspecs
*specs
,
8707 struct c_typespec spec
)
8709 tree type
= spec
.spec
;
8710 specs
->non_sc_seen_p
= true;
8711 specs
->declspecs_seen_p
= true;
8712 specs
->typespec_kind
= spec
.kind
;
8713 if (TREE_DEPRECATED (type
))
8714 specs
->deprecated_p
= true;
8716 /* Handle type specifier keywords. */
8717 if (TREE_CODE (type
) == IDENTIFIER_NODE
8718 && C_IS_RESERVED_WORD (type
)
8719 && C_RID_CODE (type
) != RID_CXX_COMPAT_WARN
)
8721 enum rid i
= C_RID_CODE (type
);
8724 error_at (loc
, "two or more data types in declaration specifiers");
8727 if ((int) i
<= (int) RID_LAST_MODIFIER
)
8729 /* "long", "short", "signed", "unsigned", "_Complex" or "_Sat". */
8734 if (specs
->long_long_p
)
8736 error_at (loc
, "%<long long long%> is too long for GCC");
8741 if (specs
->typespec_word
== cts_double
)
8744 ("both %<long long%> and %<double%> in "
8745 "declaration specifiers"));
8748 pedwarn_c90 (loc
, OPT_Wlong_long
,
8749 "ISO C90 does not support %<long long%>");
8750 specs
->long_long_p
= 1;
8755 ("both %<long%> and %<short%> in "
8756 "declaration specifiers"));
8757 else if (specs
->typespec_word
== cts_void
)
8759 ("both %<long%> and %<void%> in "
8760 "declaration specifiers"));
8761 else if (specs
->typespec_word
== cts_int128
)
8763 ("both %<long%> and %<__int128%> in "
8764 "declaration specifiers"));
8765 else if (specs
->typespec_word
== cts_bool
)
8767 ("both %<long%> and %<_Bool%> in "
8768 "declaration specifiers"));
8769 else if (specs
->typespec_word
== cts_char
)
8771 ("both %<long%> and %<char%> in "
8772 "declaration specifiers"));
8773 else if (specs
->typespec_word
== cts_float
)
8775 ("both %<long%> and %<float%> in "
8776 "declaration specifiers"));
8777 else if (specs
->typespec_word
== cts_dfloat32
)
8779 ("both %<long%> and %<_Decimal32%> in "
8780 "declaration specifiers"));
8781 else if (specs
->typespec_word
== cts_dfloat64
)
8783 ("both %<long%> and %<_Decimal64%> in "
8784 "declaration specifiers"));
8785 else if (specs
->typespec_word
== cts_dfloat128
)
8787 ("both %<long%> and %<_Decimal128%> in "
8788 "declaration specifiers"));
8790 specs
->long_p
= true;
8793 dupe
= specs
->short_p
;
8796 ("both %<long%> and %<short%> in "
8797 "declaration specifiers"));
8798 else if (specs
->typespec_word
== cts_void
)
8800 ("both %<short%> and %<void%> in "
8801 "declaration specifiers"));
8802 else if (specs
->typespec_word
== cts_int128
)
8804 ("both %<short%> and %<__int128%> in "
8805 "declaration specifiers"));
8806 else if (specs
->typespec_word
== cts_bool
)
8808 ("both %<short%> and %<_Bool%> in "
8809 "declaration specifiers"));
8810 else if (specs
->typespec_word
== cts_char
)
8812 ("both %<short%> and %<char%> in "
8813 "declaration specifiers"));
8814 else if (specs
->typespec_word
== cts_float
)
8816 ("both %<short%> and %<float%> in "
8817 "declaration specifiers"));
8818 else if (specs
->typespec_word
== cts_double
)
8820 ("both %<short%> and %<double%> in "
8821 "declaration specifiers"));
8822 else if (specs
->typespec_word
== cts_dfloat32
)
8824 ("both %<short%> and %<_Decimal32%> in "
8825 "declaration specifiers"));
8826 else if (specs
->typespec_word
== cts_dfloat64
)
8828 ("both %<short%> and %<_Decimal64%> in "
8829 "declaration specifiers"));
8830 else if (specs
->typespec_word
== cts_dfloat128
)
8832 ("both %<short%> and %<_Decimal128%> in "
8833 "declaration specifiers"));
8835 specs
->short_p
= true;
8838 dupe
= specs
->signed_p
;
8839 if (specs
->unsigned_p
)
8841 ("both %<signed%> and %<unsigned%> in "
8842 "declaration specifiers"));
8843 else if (specs
->typespec_word
== cts_void
)
8845 ("both %<signed%> and %<void%> in "
8846 "declaration specifiers"));
8847 else if (specs
->typespec_word
== cts_bool
)
8849 ("both %<signed%> and %<_Bool%> in "
8850 "declaration specifiers"));
8851 else if (specs
->typespec_word
== cts_float
)
8853 ("both %<signed%> and %<float%> in "
8854 "declaration specifiers"));
8855 else if (specs
->typespec_word
== cts_double
)
8857 ("both %<signed%> and %<double%> in "
8858 "declaration specifiers"));
8859 else if (specs
->typespec_word
== cts_dfloat32
)
8861 ("both %<signed%> and %<_Decimal32%> in "
8862 "declaration specifiers"));
8863 else if (specs
->typespec_word
== cts_dfloat64
)
8865 ("both %<signed%> and %<_Decimal64%> in "
8866 "declaration specifiers"));
8867 else if (specs
->typespec_word
== cts_dfloat128
)
8869 ("both %<signed%> and %<_Decimal128%> in "
8870 "declaration specifiers"));
8872 specs
->signed_p
= true;
8875 dupe
= specs
->unsigned_p
;
8876 if (specs
->signed_p
)
8878 ("both %<signed%> and %<unsigned%> in "
8879 "declaration specifiers"));
8880 else if (specs
->typespec_word
== cts_void
)
8882 ("both %<unsigned%> and %<void%> in "
8883 "declaration specifiers"));
8884 else if (specs
->typespec_word
== cts_bool
)
8886 ("both %<unsigned%> and %<_Bool%> in "
8887 "declaration specifiers"));
8888 else if (specs
->typespec_word
== cts_float
)
8890 ("both %<unsigned%> and %<float%> in "
8891 "declaration specifiers"));
8892 else if (specs
->typespec_word
== cts_double
)
8894 ("both %<unsigned%> and %<double%> in "
8895 "declaration specifiers"));
8896 else if (specs
->typespec_word
== cts_dfloat32
)
8898 ("both %<unsigned%> and %<_Decimal32%> in "
8899 "declaration specifiers"));
8900 else if (specs
->typespec_word
== cts_dfloat64
)
8902 ("both %<unsigned%> and %<_Decimal64%> in "
8903 "declaration specifiers"));
8904 else if (specs
->typespec_word
== cts_dfloat128
)
8906 ("both %<unsigned%> and %<_Decimal128%> in "
8907 "declaration specifiers"));
8909 specs
->unsigned_p
= true;
8912 dupe
= specs
->complex_p
;
8913 if (!flag_isoc99
&& !in_system_header
)
8914 pedwarn (loc
, OPT_pedantic
,
8915 "ISO C90 does not support complex types");
8916 if (specs
->typespec_word
== cts_void
)
8918 ("both %<complex%> and %<void%> in "
8919 "declaration specifiers"));
8920 else if (specs
->typespec_word
== cts_bool
)
8922 ("both %<complex%> and %<_Bool%> in "
8923 "declaration specifiers"));
8924 else if (specs
->typespec_word
== cts_dfloat32
)
8926 ("both %<complex%> and %<_Decimal32%> in "
8927 "declaration specifiers"));
8928 else if (specs
->typespec_word
== cts_dfloat64
)
8930 ("both %<complex%> and %<_Decimal64%> in "
8931 "declaration specifiers"));
8932 else if (specs
->typespec_word
== cts_dfloat128
)
8934 ("both %<complex%> and %<_Decimal128%> in "
8935 "declaration specifiers"));
8936 else if (specs
->typespec_word
== cts_fract
)
8938 ("both %<complex%> and %<_Fract%> in "
8939 "declaration specifiers"));
8940 else if (specs
->typespec_word
== cts_accum
)
8942 ("both %<complex%> and %<_Accum%> in "
8943 "declaration specifiers"));
8944 else if (specs
->saturating_p
)
8946 ("both %<complex%> and %<_Sat%> in "
8947 "declaration specifiers"));
8949 specs
->complex_p
= true;
8952 dupe
= specs
->saturating_p
;
8953 pedwarn (loc
, OPT_pedantic
,
8954 "ISO C does not support saturating types");
8955 if (specs
->typespec_word
== cts_int128
)
8958 ("both %<_Sat%> and %<__int128%> in "
8959 "declaration specifiers"));
8961 else if (specs
->typespec_word
== cts_void
)
8963 ("both %<_Sat%> and %<void%> in "
8964 "declaration specifiers"));
8965 else if (specs
->typespec_word
== cts_bool
)
8967 ("both %<_Sat%> and %<_Bool%> in "
8968 "declaration specifiers"));
8969 else if (specs
->typespec_word
== cts_char
)
8971 ("both %<_Sat%> and %<char%> in "
8972 "declaration specifiers"));
8973 else if (specs
->typespec_word
== cts_int
)
8975 ("both %<_Sat%> and %<int%> in "
8976 "declaration specifiers"));
8977 else if (specs
->typespec_word
== cts_float
)
8979 ("both %<_Sat%> and %<float%> in "
8980 "declaration specifiers"));
8981 else if (specs
->typespec_word
== cts_double
)
8983 ("both %<_Sat%> and %<double%> in "
8984 "declaration specifiers"));
8985 else if (specs
->typespec_word
== cts_dfloat32
)
8987 ("both %<_Sat%> and %<_Decimal32%> in "
8988 "declaration specifiers"));
8989 else if (specs
->typespec_word
== cts_dfloat64
)
8991 ("both %<_Sat%> and %<_Decimal64%> in "
8992 "declaration specifiers"));
8993 else if (specs
->typespec_word
== cts_dfloat128
)
8995 ("both %<_Sat%> and %<_Decimal128%> in "
8996 "declaration specifiers"));
8997 else if (specs
->complex_p
)
8999 ("both %<_Sat%> and %<complex%> in "
9000 "declaration specifiers"));
9002 specs
->saturating_p
= true;
9009 error_at (loc
, "duplicate %qE", type
);
9015 /* "void", "_Bool", "char", "int", "float", "double", "_Decimal32",
9016 "__int128", "_Decimal64", "_Decimal128", "_Fract" or "_Accum". */
9017 if (specs
->typespec_word
!= cts_none
)
9020 "two or more data types in declaration specifiers");
9026 if (int128_integer_type_node
== NULL_TREE
)
9028 error_at (loc
, "%<__int128%> is not supported for this target");
9031 if (!in_system_header
)
9032 pedwarn (loc
, OPT_pedantic
,
9033 "ISO C does not support %<__int128%> type");
9037 ("both %<__int128%> and %<long%> in "
9038 "declaration specifiers"));
9039 else if (specs
->saturating_p
)
9041 ("both %<_Sat%> and %<__int128%> in "
9042 "declaration specifiers"));
9043 else if (specs
->short_p
)
9045 ("both %<__int128%> and %<short%> in "
9046 "declaration specifiers"));
9048 specs
->typespec_word
= cts_int128
;
9053 ("both %<long%> and %<void%> in "
9054 "declaration specifiers"));
9055 else if (specs
->short_p
)
9057 ("both %<short%> and %<void%> in "
9058 "declaration specifiers"));
9059 else if (specs
->signed_p
)
9061 ("both %<signed%> and %<void%> in "
9062 "declaration specifiers"));
9063 else if (specs
->unsigned_p
)
9065 ("both %<unsigned%> and %<void%> in "
9066 "declaration specifiers"));
9067 else if (specs
->complex_p
)
9069 ("both %<complex%> and %<void%> in "
9070 "declaration specifiers"));
9071 else if (specs
->saturating_p
)
9073 ("both %<_Sat%> and %<void%> in "
9074 "declaration specifiers"));
9076 specs
->typespec_word
= cts_void
;
9081 ("both %<long%> and %<_Bool%> in "
9082 "declaration specifiers"));
9083 else if (specs
->short_p
)
9085 ("both %<short%> and %<_Bool%> in "
9086 "declaration specifiers"));
9087 else if (specs
->signed_p
)
9089 ("both %<signed%> and %<_Bool%> in "
9090 "declaration specifiers"));
9091 else if (specs
->unsigned_p
)
9093 ("both %<unsigned%> and %<_Bool%> in "
9094 "declaration specifiers"));
9095 else if (specs
->complex_p
)
9097 ("both %<complex%> and %<_Bool%> in "
9098 "declaration specifiers"));
9099 else if (specs
->saturating_p
)
9101 ("both %<_Sat%> and %<_Bool%> in "
9102 "declaration specifiers"));
9104 specs
->typespec_word
= cts_bool
;
9109 ("both %<long%> and %<char%> in "
9110 "declaration specifiers"));
9111 else if (specs
->short_p
)
9113 ("both %<short%> and %<char%> in "
9114 "declaration specifiers"));
9115 else if (specs
->saturating_p
)
9117 ("both %<_Sat%> and %<char%> in "
9118 "declaration specifiers"));
9120 specs
->typespec_word
= cts_char
;
9123 if (specs
->saturating_p
)
9125 ("both %<_Sat%> and %<int%> in "
9126 "declaration specifiers"));
9128 specs
->typespec_word
= cts_int
;
9133 ("both %<long%> and %<float%> in "
9134 "declaration specifiers"));
9135 else if (specs
->short_p
)
9137 ("both %<short%> and %<float%> in "
9138 "declaration specifiers"));
9139 else if (specs
->signed_p
)
9141 ("both %<signed%> and %<float%> in "
9142 "declaration specifiers"));
9143 else if (specs
->unsigned_p
)
9145 ("both %<unsigned%> and %<float%> in "
9146 "declaration specifiers"));
9147 else if (specs
->saturating_p
)
9149 ("both %<_Sat%> and %<float%> in "
9150 "declaration specifiers"));
9152 specs
->typespec_word
= cts_float
;
9155 if (specs
->long_long_p
)
9157 ("both %<long long%> and %<double%> in "
9158 "declaration specifiers"));
9159 else if (specs
->short_p
)
9161 ("both %<short%> and %<double%> in "
9162 "declaration specifiers"));
9163 else if (specs
->signed_p
)
9165 ("both %<signed%> and %<double%> in "
9166 "declaration specifiers"));
9167 else if (specs
->unsigned_p
)
9169 ("both %<unsigned%> and %<double%> in "
9170 "declaration specifiers"));
9171 else if (specs
->saturating_p
)
9173 ("both %<_Sat%> and %<double%> in "
9174 "declaration specifiers"));
9176 specs
->typespec_word
= cts_double
;
9183 if (i
== RID_DFLOAT32
)
9185 else if (i
== RID_DFLOAT64
)
9188 str
= "_Decimal128";
9189 if (specs
->long_long_p
)
9191 ("both %<long long%> and %<%s%> in "
9192 "declaration specifiers"),
9196 ("both %<long%> and %<%s%> in "
9197 "declaration specifiers"),
9199 else if (specs
->short_p
)
9201 ("both %<short%> and %<%s%> in "
9202 "declaration specifiers"),
9204 else if (specs
->signed_p
)
9206 ("both %<signed%> and %<%s%> in "
9207 "declaration specifiers"),
9209 else if (specs
->unsigned_p
)
9211 ("both %<unsigned%> and %<%s%> in "
9212 "declaration specifiers"),
9214 else if (specs
->complex_p
)
9216 ("both %<complex%> and %<%s%> in "
9217 "declaration specifiers"),
9219 else if (specs
->saturating_p
)
9221 ("both %<_Sat%> and %<%s%> in "
9222 "declaration specifiers"),
9224 else if (i
== RID_DFLOAT32
)
9225 specs
->typespec_word
= cts_dfloat32
;
9226 else if (i
== RID_DFLOAT64
)
9227 specs
->typespec_word
= cts_dfloat64
;
9229 specs
->typespec_word
= cts_dfloat128
;
9231 if (!targetm
.decimal_float_supported_p ())
9233 ("decimal floating point not supported "
9234 "for this target"));
9235 pedwarn (loc
, OPT_pedantic
,
9236 "ISO C does not support decimal floating point");
9246 if (specs
->complex_p
)
9248 ("both %<complex%> and %<%s%> in "
9249 "declaration specifiers"),
9251 else if (i
== RID_FRACT
)
9252 specs
->typespec_word
= cts_fract
;
9254 specs
->typespec_word
= cts_accum
;
9256 if (!targetm
.fixed_point_supported_p ())
9258 "fixed-point types not supported for this target");
9259 pedwarn (loc
, OPT_pedantic
,
9260 "ISO C does not support fixed-point types");
9263 /* ObjC reserved word "id", handled below. */
9269 /* Now we have a typedef (a TYPE_DECL node), an identifier (some
9270 form of ObjC type, cases such as "int" and "long" being handled
9271 above), a TYPE (struct, union, enum and typeof specifiers) or an
9272 ERROR_MARK. In none of these cases may there have previously
9273 been any type specifiers. */
9274 if (specs
->type
|| specs
->typespec_word
!= cts_none
9275 || specs
->long_p
|| specs
->short_p
|| specs
->signed_p
9276 || specs
->unsigned_p
|| specs
->complex_p
)
9277 error_at (loc
, "two or more data types in declaration specifiers");
9278 else if (TREE_CODE (type
) == TYPE_DECL
)
9280 if (TREE_TYPE (type
) == error_mark_node
)
9281 ; /* Allow the type to default to int to avoid cascading errors. */
9284 specs
->type
= TREE_TYPE (type
);
9285 specs
->decl_attr
= DECL_ATTRIBUTES (type
);
9286 specs
->typedef_p
= true;
9287 specs
->explicit_signed_p
= C_TYPEDEF_EXPLICITLY_SIGNED (type
);
9289 /* If this typedef name is defined in a struct, then a C++
9290 lookup would return a different value. */
9292 && I_SYMBOL_BINDING (DECL_NAME (type
))->in_struct
)
9293 warning_at (loc
, OPT_Wc___compat
,
9294 "C++ lookup of %qD would return a field, not a type",
9297 /* If we are parsing a struct, record that a struct field
9299 if (warn_cxx_compat
&& struct_parse_info
!= NULL
)
9300 VEC_safe_push (tree
, heap
, struct_parse_info
->typedefs_seen
, type
);
9303 else if (TREE_CODE (type
) == IDENTIFIER_NODE
)
9305 tree t
= lookup_name (type
);
9306 if (!t
|| TREE_CODE (t
) != TYPE_DECL
)
9307 error_at (loc
, "%qE fails to be a typedef or built in type", type
);
9308 else if (TREE_TYPE (t
) == error_mark_node
)
9311 specs
->type
= TREE_TYPE (t
);
9315 if (TREE_CODE (type
) != ERROR_MARK
&& spec
.kind
== ctsk_typeof
)
9317 specs
->typedef_p
= true;
9321 specs
->expr
= build2 (COMPOUND_EXPR
, TREE_TYPE (spec
.expr
),
9322 specs
->expr
, spec
.expr
);
9324 specs
->expr
= spec
.expr
;
9325 specs
->expr_const_operands
&= spec
.expr_const_operands
;
9334 /* Add the storage class specifier or function specifier SCSPEC to the
9335 declaration specifiers SPECS, returning SPECS. */
9337 struct c_declspecs
*
9338 declspecs_add_scspec (struct c_declspecs
*specs
, tree scspec
)
9341 enum c_storage_class n
= csc_none
;
9343 specs
->declspecs_seen_p
= true;
9344 gcc_assert (TREE_CODE (scspec
) == IDENTIFIER_NODE
9345 && C_IS_RESERVED_WORD (scspec
));
9346 i
= C_RID_CODE (scspec
);
9347 if (specs
->non_sc_seen_p
)
9348 warning (OPT_Wold_style_declaration
,
9349 "%qE is not at beginning of declaration", scspec
);
9353 /* C99 permits duplicate inline. Although of doubtful utility,
9354 it seems simplest to permit it in gnu89 mode as well, as
9355 there is also little utility in maintaining this as a
9356 difference between gnu89 and C99 inline. */
9358 specs
->inline_p
= true;
9361 dupe
= specs
->thread_p
;
9362 if (specs
->storage_class
== csc_auto
)
9363 error ("%<__thread%> used with %<auto%>");
9364 else if (specs
->storage_class
== csc_register
)
9365 error ("%<__thread%> used with %<register%>");
9366 else if (specs
->storage_class
== csc_typedef
)
9367 error ("%<__thread%> used with %<typedef%>");
9369 specs
->thread_p
= true;
9376 /* Diagnose "__thread extern". */
9377 if (specs
->thread_p
)
9378 error ("%<__thread%> before %<extern%>");
9385 /* Diagnose "__thread static". */
9386 if (specs
->thread_p
)
9387 error ("%<__thread%> before %<static%>");
9395 if (n
!= csc_none
&& n
== specs
->storage_class
)
9398 error ("duplicate %qE", scspec
);
9401 if (specs
->storage_class
!= csc_none
&& n
!= specs
->storage_class
)
9403 error ("multiple storage classes in declaration specifiers");
9407 specs
->storage_class
= n
;
9408 if (n
!= csc_extern
&& n
!= csc_static
&& specs
->thread_p
)
9410 error ("%<__thread%> used with %qE", scspec
);
9411 specs
->thread_p
= false;
9418 /* Add the attributes ATTRS to the declaration specifiers SPECS,
9421 struct c_declspecs
*
9422 declspecs_add_attrs (struct c_declspecs
*specs
, tree attrs
)
9424 specs
->attrs
= chainon (attrs
, specs
->attrs
);
9425 specs
->declspecs_seen_p
= true;
9429 /* Combine "long", "short", "signed", "unsigned" and "_Complex" type
9430 specifiers with any other type specifier to determine the resulting
9431 type. This is where ISO C checks on complex types are made, since
9432 "_Complex long" is a prefix of the valid ISO C type "_Complex long
9435 struct c_declspecs
*
9436 finish_declspecs (struct c_declspecs
*specs
)
9438 /* If a type was specified as a whole, we have no modifiers and are
9440 if (specs
->type
!= NULL_TREE
)
9442 gcc_assert (!specs
->long_p
&& !specs
->long_long_p
&& !specs
->short_p
9443 && !specs
->signed_p
&& !specs
->unsigned_p
9444 && !specs
->complex_p
);
9446 /* Set a dummy type. */
9447 if (TREE_CODE (specs
->type
) == ERROR_MARK
)
9448 specs
->type
= integer_type_node
;
9452 /* If none of "void", "_Bool", "char", "int", "float" or "double"
9453 has been specified, treat it as "int" unless "_Complex" is
9454 present and there are no other specifiers. If we just have
9455 "_Complex", it is equivalent to "_Complex double", but e.g.
9456 "_Complex short" is equivalent to "_Complex short int". */
9457 if (specs
->typespec_word
== cts_none
)
9459 if (specs
->saturating_p
)
9461 error ("%<_Sat%> is used without %<_Fract%> or %<_Accum%>");
9462 if (!targetm
.fixed_point_supported_p ())
9463 error ("fixed-point types not supported for this target");
9464 specs
->typespec_word
= cts_fract
;
9466 else if (specs
->long_p
|| specs
->short_p
9467 || specs
->signed_p
|| specs
->unsigned_p
)
9469 specs
->typespec_word
= cts_int
;
9471 else if (specs
->complex_p
)
9473 specs
->typespec_word
= cts_double
;
9474 pedwarn (input_location
, OPT_pedantic
,
9475 "ISO C does not support plain %<complex%> meaning "
9476 "%<double complex%>");
9480 specs
->typespec_word
= cts_int
;
9481 specs
->default_int_p
= true;
9482 /* We don't diagnose this here because grokdeclarator will
9483 give more specific diagnostics according to whether it is
9484 a function definition. */
9488 /* If "signed" was specified, record this to distinguish "int" and
9489 "signed int" in the case of a bit-field with
9490 -funsigned-bitfields. */
9491 specs
->explicit_signed_p
= specs
->signed_p
;
9493 /* Now compute the actual type. */
9494 switch (specs
->typespec_word
)
9497 gcc_assert (!specs
->long_p
&& !specs
->short_p
9498 && !specs
->signed_p
&& !specs
->unsigned_p
9499 && !specs
->complex_p
);
9500 specs
->type
= void_type_node
;
9503 gcc_assert (!specs
->long_p
&& !specs
->short_p
9504 && !specs
->signed_p
&& !specs
->unsigned_p
9505 && !specs
->complex_p
);
9506 specs
->type
= boolean_type_node
;
9509 gcc_assert (!specs
->long_p
&& !specs
->short_p
);
9510 gcc_assert (!(specs
->signed_p
&& specs
->unsigned_p
));
9511 if (specs
->signed_p
)
9512 specs
->type
= signed_char_type_node
;
9513 else if (specs
->unsigned_p
)
9514 specs
->type
= unsigned_char_type_node
;
9516 specs
->type
= char_type_node
;
9517 if (specs
->complex_p
)
9519 pedwarn (input_location
, OPT_pedantic
,
9520 "ISO C does not support complex integer types");
9521 specs
->type
= build_complex_type (specs
->type
);
9525 gcc_assert (!specs
->long_p
&& !specs
->short_p
&& !specs
->long_long_p
);
9526 gcc_assert (!(specs
->signed_p
&& specs
->unsigned_p
));
9527 specs
->type
= (specs
->unsigned_p
9528 ? int128_unsigned_type_node
9529 : int128_integer_type_node
);
9530 if (specs
->complex_p
)
9532 pedwarn (input_location
, OPT_pedantic
,
9533 "ISO C does not support complex integer types");
9534 specs
->type
= build_complex_type (specs
->type
);
9538 gcc_assert (!(specs
->long_p
&& specs
->short_p
));
9539 gcc_assert (!(specs
->signed_p
&& specs
->unsigned_p
));
9540 if (specs
->long_long_p
)
9541 specs
->type
= (specs
->unsigned_p
9542 ? long_long_unsigned_type_node
9543 : long_long_integer_type_node
);
9544 else if (specs
->long_p
)
9545 specs
->type
= (specs
->unsigned_p
9546 ? long_unsigned_type_node
9547 : long_integer_type_node
);
9548 else if (specs
->short_p
)
9549 specs
->type
= (specs
->unsigned_p
9550 ? short_unsigned_type_node
9551 : short_integer_type_node
);
9553 specs
->type
= (specs
->unsigned_p
9554 ? unsigned_type_node
9555 : integer_type_node
);
9556 if (specs
->complex_p
)
9558 pedwarn (input_location
, OPT_pedantic
,
9559 "ISO C does not support complex integer types");
9560 specs
->type
= build_complex_type (specs
->type
);
9564 gcc_assert (!specs
->long_p
&& !specs
->short_p
9565 && !specs
->signed_p
&& !specs
->unsigned_p
);
9566 specs
->type
= (specs
->complex_p
9567 ? complex_float_type_node
9571 gcc_assert (!specs
->long_long_p
&& !specs
->short_p
9572 && !specs
->signed_p
&& !specs
->unsigned_p
);
9575 specs
->type
= (specs
->complex_p
9576 ? complex_long_double_type_node
9577 : long_double_type_node
);
9581 specs
->type
= (specs
->complex_p
9582 ? complex_double_type_node
9583 : double_type_node
);
9589 gcc_assert (!specs
->long_p
&& !specs
->long_long_p
&& !specs
->short_p
9590 && !specs
->signed_p
&& !specs
->unsigned_p
&& !specs
->complex_p
);
9591 if (specs
->typespec_word
== cts_dfloat32
)
9592 specs
->type
= dfloat32_type_node
;
9593 else if (specs
->typespec_word
== cts_dfloat64
)
9594 specs
->type
= dfloat64_type_node
;
9596 specs
->type
= dfloat128_type_node
;
9599 gcc_assert (!specs
->complex_p
);
9600 if (!targetm
.fixed_point_supported_p ())
9601 specs
->type
= integer_type_node
;
9602 else if (specs
->saturating_p
)
9604 if (specs
->long_long_p
)
9605 specs
->type
= specs
->unsigned_p
9606 ? sat_unsigned_long_long_fract_type_node
9607 : sat_long_long_fract_type_node
;
9608 else if (specs
->long_p
)
9609 specs
->type
= specs
->unsigned_p
9610 ? sat_unsigned_long_fract_type_node
9611 : sat_long_fract_type_node
;
9612 else if (specs
->short_p
)
9613 specs
->type
= specs
->unsigned_p
9614 ? sat_unsigned_short_fract_type_node
9615 : sat_short_fract_type_node
;
9617 specs
->type
= specs
->unsigned_p
9618 ? sat_unsigned_fract_type_node
9619 : sat_fract_type_node
;
9623 if (specs
->long_long_p
)
9624 specs
->type
= specs
->unsigned_p
9625 ? unsigned_long_long_fract_type_node
9626 : long_long_fract_type_node
;
9627 else if (specs
->long_p
)
9628 specs
->type
= specs
->unsigned_p
9629 ? unsigned_long_fract_type_node
9630 : long_fract_type_node
;
9631 else if (specs
->short_p
)
9632 specs
->type
= specs
->unsigned_p
9633 ? unsigned_short_fract_type_node
9634 : short_fract_type_node
;
9636 specs
->type
= specs
->unsigned_p
9637 ? unsigned_fract_type_node
9642 gcc_assert (!specs
->complex_p
);
9643 if (!targetm
.fixed_point_supported_p ())
9644 specs
->type
= integer_type_node
;
9645 else if (specs
->saturating_p
)
9647 if (specs
->long_long_p
)
9648 specs
->type
= specs
->unsigned_p
9649 ? sat_unsigned_long_long_accum_type_node
9650 : sat_long_long_accum_type_node
;
9651 else if (specs
->long_p
)
9652 specs
->type
= specs
->unsigned_p
9653 ? sat_unsigned_long_accum_type_node
9654 : sat_long_accum_type_node
;
9655 else if (specs
->short_p
)
9656 specs
->type
= specs
->unsigned_p
9657 ? sat_unsigned_short_accum_type_node
9658 : sat_short_accum_type_node
;
9660 specs
->type
= specs
->unsigned_p
9661 ? sat_unsigned_accum_type_node
9662 : sat_accum_type_node
;
9666 if (specs
->long_long_p
)
9667 specs
->type
= specs
->unsigned_p
9668 ? unsigned_long_long_accum_type_node
9669 : long_long_accum_type_node
;
9670 else if (specs
->long_p
)
9671 specs
->type
= specs
->unsigned_p
9672 ? unsigned_long_accum_type_node
9673 : long_accum_type_node
;
9674 else if (specs
->short_p
)
9675 specs
->type
= specs
->unsigned_p
9676 ? unsigned_short_accum_type_node
9677 : short_accum_type_node
;
9679 specs
->type
= specs
->unsigned_p
9680 ? unsigned_accum_type_node
9691 /* A subroutine of c_write_global_declarations. Perform final processing
9692 on one file scope's declarations (or the external scope's declarations),
9696 c_write_global_declarations_1 (tree globals
)
9701 /* Process the decls in the order they were written. */
9702 for (decl
= globals
; decl
; decl
= DECL_CHAIN (decl
))
9704 /* Check for used but undefined static functions using the C
9705 standard's definition of "used", and set TREE_NO_WARNING so
9706 that check_global_declarations doesn't repeat the check. */
9707 if (TREE_CODE (decl
) == FUNCTION_DECL
9708 && DECL_INITIAL (decl
) == 0
9709 && DECL_EXTERNAL (decl
)
9710 && !TREE_PUBLIC (decl
)
9711 && C_DECL_USED (decl
))
9713 pedwarn (input_location
, 0, "%q+F used but never defined", decl
);
9714 TREE_NO_WARNING (decl
) = 1;
9717 wrapup_global_declaration_1 (decl
);
9723 for (decl
= globals
; decl
; decl
= DECL_CHAIN (decl
))
9724 reconsider
|= wrapup_global_declaration_2 (decl
);
9728 for (decl
= globals
; decl
; decl
= DECL_CHAIN (decl
))
9729 check_global_declaration_1 (decl
);
9732 /* A subroutine of c_write_global_declarations Emit debug information for each
9733 of the declarations in GLOBALS. */
9736 c_write_global_declarations_2 (tree globals
)
9740 for (decl
= globals
; decl
; decl
= DECL_CHAIN (decl
))
9741 debug_hooks
->global_decl (decl
);
9744 /* Callback to collect a source_ref from a DECL. */
9747 collect_source_ref_cb (tree decl
)
9749 if (!DECL_IS_BUILTIN (decl
))
9750 collect_source_ref (LOCATION_FILE (decl_sloc (decl
, false)));
9753 /* Collect all references relevant to SOURCE_FILE. */
9756 collect_all_refs (const char *source_file
)
9761 FOR_EACH_VEC_ELT (tree
, all_translation_units
, i
, t
)
9762 collect_ada_nodes (BLOCK_VARS (DECL_INITIAL (t
)), source_file
);
9765 /* Iterate over all global declarations and call CALLBACK. */
9768 for_each_global_decl (void (*callback
) (tree decl
))
9775 FOR_EACH_VEC_ELT (tree
, all_translation_units
, i
, t
)
9777 decls
= DECL_INITIAL (t
);
9778 for (decl
= BLOCK_VARS (decls
); decl
; decl
= TREE_CHAIN (decl
))
9783 /* Preserve the external declarations scope across a garbage collect. */
9784 static GTY(()) tree ext_block
;
9787 c_write_global_declarations (void)
9792 /* We don't want to do this if generating a PCH. */
9796 timevar_start (TV_PHASE_DEFERRED
);
9798 /* Do the Objective-C stuff. This is where all the Objective-C
9799 module stuff gets generated (symtab, class/protocol/selector
9801 if (c_dialect_objc ())
9802 objc_write_global_declarations ();
9804 /* Close the external scope. */
9805 ext_block
= pop_scope ();
9807 gcc_assert (!current_scope
);
9809 /* Handle -fdump-ada-spec[-slim]. */
9810 if (dump_enabled_p (TDI_ada
))
9812 /* Build a table of files to generate specs for */
9813 if (get_dump_file_info (TDI_ada
)->flags
& TDF_SLIM
)
9814 collect_source_ref (main_input_filename
);
9816 for_each_global_decl (collect_source_ref_cb
);
9818 dump_ada_specs (collect_all_refs
, NULL
);
9823 tree tmp
= BLOCK_VARS (ext_block
);
9825 FILE * stream
= dump_begin (TDI_tu
, &flags
);
9828 dump_node (tmp
, flags
& ~TDF_SLIM
, stream
);
9829 dump_end (TDI_tu
, stream
);
9833 /* Process all file scopes in this compilation, and the external_scope,
9834 through wrapup_global_declarations and check_global_declarations. */
9835 FOR_EACH_VEC_ELT (tree
, all_translation_units
, i
, t
)
9836 c_write_global_declarations_1 (BLOCK_VARS (DECL_INITIAL (t
)));
9837 c_write_global_declarations_1 (BLOCK_VARS (ext_block
));
9839 timevar_stop (TV_PHASE_DEFERRED
);
9840 timevar_start (TV_PHASE_CGRAPH
);
9842 /* We're done parsing; proceed to optimize and emit assembly.
9843 FIXME: shouldn't be the front end's responsibility to call this. */
9844 cgraph_finalize_compilation_unit ();
9846 timevar_stop (TV_PHASE_CGRAPH
);
9847 timevar_start (TV_PHASE_DBGINFO
);
9849 /* After cgraph has had a chance to emit everything that's going to
9850 be emitted, output debug information for globals. */
9853 timevar_push (TV_SYMOUT
);
9854 FOR_EACH_VEC_ELT (tree
, all_translation_units
, i
, t
)
9855 c_write_global_declarations_2 (BLOCK_VARS (DECL_INITIAL (t
)));
9856 c_write_global_declarations_2 (BLOCK_VARS (ext_block
));
9857 timevar_pop (TV_SYMOUT
);
9861 timevar_stop (TV_PHASE_DBGINFO
);
9864 /* Register reserved keyword WORD as qualifier for address space AS. */
9867 c_register_addr_space (const char *word
, addr_space_t as
)
9869 int rid
= RID_FIRST_ADDR_SPACE
+ as
;
9872 /* Address space qualifiers are only supported
9873 in C with GNU extensions enabled. */
9874 if (c_dialect_objc () || flag_no_asm
)
9877 id
= get_identifier (word
);
9878 C_SET_RID_CODE (id
, rid
);
9879 C_IS_RESERVED_WORD (id
) = 1;
9880 ridpointers
[rid
] = id
;
9883 #include "gt-c-decl.h"