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 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
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"
53 #include "langhooks.h"
54 #include "tree-mudflap.h"
55 #include "tree-gimple.h"
56 #include "diagnostic.h"
57 #include "tree-dump.h"
62 #include "langhooks-def.h"
63 #include "pointer-set.h"
65 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
67 { NORMAL
, /* Ordinary declaration */
68 FUNCDEF
, /* Function definition */
69 PARM
, /* Declaration of parm before function body */
70 FIELD
, /* Declaration inside struct or union */
71 TYPENAME
}; /* Typename (inside cast or sizeof) */
74 /* Nonzero if we have seen an invalid cross reference
75 to a struct, union, or enum, but not yet printed the message. */
76 tree pending_invalid_xref
;
78 /* File and line to appear in the eventual error message. */
79 location_t pending_invalid_xref_location
;
81 /* True means we've initialized exception handling. */
82 bool c_eh_initialized_p
;
84 /* While defining an enum type, this is 1 plus the last enumerator
85 constant value. Note that will do not have to save this or `enum_overflow'
86 around nested function definition since such a definition could only
87 occur in an enum value expression and we don't use these variables in
90 static tree enum_next_value
;
92 /* Nonzero means that there was overflow computing enum_next_value. */
94 static int enum_overflow
;
96 /* The file and line that the prototype came from if this is an
97 old-style definition; used for diagnostics in
98 store_parm_decls_oldstyle. */
100 static location_t current_function_prototype_locus
;
102 /* Whether this prototype was built-in. */
104 static bool current_function_prototype_built_in
;
106 /* The argument type information of this prototype. */
108 static tree current_function_prototype_arg_types
;
110 /* The argument information structure for the function currently being
113 static struct c_arg_info
*current_function_arg_info
;
115 /* The obstack on which parser and related data structures, which are
116 not live beyond their top-level declaration or definition, are
118 struct obstack parser_obstack
;
120 /* The current statement tree. */
122 static GTY(()) struct stmt_tree_s c_stmt_tree
;
124 /* State saving variables. */
128 /* Linked list of TRANSLATION_UNIT_DECLS for the translation units
129 included in this invocation. Note that the current translation
130 unit is not included in this list. */
132 static GTY(()) tree all_translation_units
;
134 /* A list of decls to be made automatically visible in each file scope. */
135 static GTY(()) tree visible_builtins
;
137 /* Set to 0 at beginning of a function definition, set to 1 if
138 a return statement that specifies a return value is seen. */
140 int current_function_returns_value
;
142 /* Set to 0 at beginning of a function definition, set to 1 if
143 a return statement with no argument is seen. */
145 int current_function_returns_null
;
147 /* Set to 0 at beginning of a function definition, set to 1 if
148 a call to a noreturn function is seen. */
150 int current_function_returns_abnormally
;
152 /* Set to nonzero by `grokdeclarator' for a function
153 whose return type is defaulted, if warnings for this are desired. */
155 static int warn_about_return_type
;
157 /* Nonzero when the current toplevel function contains a declaration
158 of a nested function which is never defined. */
160 static bool undef_nested_function
;
162 /* True means global_bindings_p should return false even if the scope stack
163 says we are in file scope. */
164 bool c_override_global_bindings_to_false
;
167 /* Each c_binding structure describes one binding of an identifier to
168 a decl. All the decls in a scope - irrespective of namespace - are
169 chained together by the ->prev field, which (as the name implies)
170 runs in reverse order. All the decls in a given namespace bound to
171 a given identifier are chained by the ->shadowed field, which runs
172 from inner to outer scopes.
174 The ->decl field usually points to a DECL node, but there are two
175 exceptions. In the namespace of type tags, the bound entity is a
176 RECORD_TYPE, UNION_TYPE, or ENUMERAL_TYPE node. If an undeclared
177 identifier is encountered, it is bound to error_mark_node to
178 suppress further errors about that identifier in the current
181 The ->type field stores the type of the declaration in this scope;
182 if NULL, the type is the type of the ->decl field. This is only of
183 relevance for objects with external or internal linkage which may
184 be redeclared in inner scopes, forming composite types that only
185 persist for the duration of those scopes. In the external scope,
186 this stores the composite of all the types declared for this
187 object, visible or not. The ->inner_comp field (used only at file
188 scope) stores whether an incomplete array type at file scope was
189 completed at an inner scope to an array size other than 1.
191 The depth field is copied from the scope structure that holds this
192 decl. It is used to preserve the proper ordering of the ->shadowed
193 field (see bind()) and also for a handful of special-case checks.
194 Finally, the invisible bit is true for a decl which should be
195 ignored for purposes of normal name lookup, and the nested bit is
196 true for a decl that's been bound a second time in an inner scope;
197 in all such cases, the binding in the outer scope will have its
198 invisible bit true. */
200 struct c_binding
GTY((chain_next ("%h.prev")))
202 tree decl
; /* the decl bound */
203 tree type
; /* the type in this scope */
204 tree id
; /* the identifier it's bound to */
205 struct c_binding
*prev
; /* the previous decl in this scope */
206 struct c_binding
*shadowed
; /* the innermost decl shadowed by this one */
207 unsigned int depth
: 28; /* depth of this scope */
208 BOOL_BITFIELD invisible
: 1; /* normal lookup should ignore this binding */
209 BOOL_BITFIELD nested
: 1; /* do not set DECL_CONTEXT when popping */
210 BOOL_BITFIELD inner_comp
: 1; /* incomplete array completed in inner scope */
213 #define B_IN_SCOPE(b1, b2) ((b1)->depth == (b2)->depth)
214 #define B_IN_CURRENT_SCOPE(b) ((b)->depth == current_scope->depth)
215 #define B_IN_FILE_SCOPE(b) ((b)->depth == 1 /*file_scope->depth*/)
216 #define B_IN_EXTERNAL_SCOPE(b) ((b)->depth == 0 /*external_scope->depth*/)
218 #define I_SYMBOL_BINDING(node) \
219 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->symbol_binding)
220 #define I_SYMBOL_DECL(node) \
221 (I_SYMBOL_BINDING(node) ? I_SYMBOL_BINDING(node)->decl : 0)
223 #define I_TAG_BINDING(node) \
224 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->tag_binding)
225 #define I_TAG_DECL(node) \
226 (I_TAG_BINDING(node) ? I_TAG_BINDING(node)->decl : 0)
228 #define I_LABEL_BINDING(node) \
229 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->label_binding)
230 #define I_LABEL_DECL(node) \
231 (I_LABEL_BINDING(node) ? I_LABEL_BINDING(node)->decl : 0)
233 /* Each C symbol points to three linked lists of c_binding structures.
234 These describe the values of the identifier in the three different
235 namespaces defined by the language. */
237 struct lang_identifier
GTY(())
239 struct c_common_identifier common_id
;
240 struct c_binding
*symbol_binding
; /* vars, funcs, constants, typedefs */
241 struct c_binding
*tag_binding
; /* struct/union/enum tags */
242 struct c_binding
*label_binding
; /* labels */
245 /* Validate c-lang.c's assumptions. */
246 extern char C_SIZEOF_STRUCT_LANG_IDENTIFIER_isnt_accurate
247 [(sizeof(struct lang_identifier
) == C_SIZEOF_STRUCT_LANG_IDENTIFIER
) ? 1 : -1];
249 /* The resulting tree type. */
252 GTY((desc ("TREE_CODE (&%h.generic) == IDENTIFIER_NODE"),
253 chain_next ("TREE_CODE (&%h.generic) == INTEGER_TYPE ? (union lang_tree_node *) TYPE_NEXT_VARIANT (&%h.generic) : ((union lang_tree_node *) GENERIC_NEXT (&%h.generic))")))
255 union tree_node
GTY ((tag ("0"),
256 desc ("tree_node_structure (&%h)")))
258 struct lang_identifier
GTY ((tag ("1"))) identifier
;
261 /* Each c_scope structure describes the complete contents of one
262 scope. Four scopes are distinguished specially: the innermost or
263 current scope, the innermost function scope, the file scope (always
264 the second to outermost) and the outermost or external scope.
266 Most declarations are recorded in the current scope.
268 All normal label declarations are recorded in the innermost
269 function scope, as are bindings of undeclared identifiers to
270 error_mark_node. (GCC permits nested functions as an extension,
271 hence the 'innermost' qualifier.) Explicitly declared labels
272 (using the __label__ extension) appear in the current scope.
274 Being in the file scope (current_scope == file_scope) causes
275 special behavior in several places below. Also, under some
276 conditions the Objective-C front end records declarations in the
277 file scope even though that isn't the current scope.
279 All declarations with external linkage are recorded in the external
280 scope, even if they aren't visible there; this models the fact that
281 such declarations are visible to the entire program, and (with a
282 bit of cleverness, see pushdecl) allows diagnosis of some violations
283 of C99 6.2.2p7 and 6.2.7p2:
285 If, within the same translation unit, the same identifier appears
286 with both internal and external linkage, the behavior is
289 All declarations that refer to the same object or function shall
290 have compatible type; otherwise, the behavior is undefined.
292 Initially only the built-in declarations, which describe compiler
293 intrinsic functions plus a subset of the standard library, are in
296 The order of the blocks list matters, and it is frequently appended
297 to. To avoid having to walk all the way to the end of the list on
298 each insertion, or reverse the list later, we maintain a pointer to
299 the last list entry. (FIXME: It should be feasible to use a reversed
302 The bindings list is strictly in reverse order of declarations;
303 pop_scope relies on this. */
306 struct c_scope
GTY((chain_next ("%h.outer")))
308 /* The scope containing this one. */
309 struct c_scope
*outer
;
311 /* The next outermost function scope. */
312 struct c_scope
*outer_function
;
314 /* All bindings in this scope. */
315 struct c_binding
*bindings
;
317 /* For each scope (except the global one), a chain of BLOCK nodes
318 for all the scopes that were entered and exited one level down. */
322 /* The depth of this scope. Used to keep the ->shadowed chain of
323 bindings sorted innermost to outermost. */
324 unsigned int depth
: 28;
326 /* True if we are currently filling this scope with parameter
328 BOOL_BITFIELD parm_flag
: 1;
330 /* True if we saw [*] in this scope. Used to give an error messages
331 if these appears in a function definition. */
332 BOOL_BITFIELD had_vla_unspec
: 1;
334 /* True if we already complained about forward parameter decls
335 in this scope. This prevents double warnings on
336 foo (int a; int b; ...) */
337 BOOL_BITFIELD warned_forward_parm_decls
: 1;
339 /* True if this is the outermost block scope of a function body.
340 This scope contains the parameters, the local variables declared
341 in the outermost block, and all the labels (except those in
342 nested functions, or declared at block scope with __label__). */
343 BOOL_BITFIELD function_body
: 1;
345 /* True means make a BLOCK for this scope no matter what. */
346 BOOL_BITFIELD keep
: 1;
349 /* The scope currently in effect. */
351 static GTY(()) struct c_scope
*current_scope
;
353 /* The innermost function scope. Ordinary (not explicitly declared)
354 labels, bindings to error_mark_node, and the lazily-created
355 bindings of __func__ and its friends get this scope. */
357 static GTY(()) struct c_scope
*current_function_scope
;
359 /* The C file scope. This is reset for each input translation unit. */
361 static GTY(()) struct c_scope
*file_scope
;
363 /* The outermost scope. This is used for all declarations with
364 external linkage, and only these, hence the name. */
366 static GTY(()) struct c_scope
*external_scope
;
368 /* A chain of c_scope structures awaiting reuse. */
370 static GTY((deletable
)) struct c_scope
*scope_freelist
;
372 /* A chain of c_binding structures awaiting reuse. */
374 static GTY((deletable
)) struct c_binding
*binding_freelist
;
376 /* Append VAR to LIST in scope SCOPE. */
377 #define SCOPE_LIST_APPEND(scope, list, decl) do { \
378 struct c_scope *s_ = (scope); \
380 if (s_->list##_last) \
381 TREE_CHAIN (s_->list##_last) = d_; \
384 s_->list##_last = d_; \
387 /* Concatenate FROM in scope FSCOPE onto TO in scope TSCOPE. */
388 #define SCOPE_LIST_CONCAT(tscope, to, fscope, from) do { \
389 struct c_scope *t_ = (tscope); \
390 struct c_scope *f_ = (fscope); \
392 TREE_CHAIN (t_->to##_last) = f_->from; \
395 t_->to##_last = f_->from##_last; \
398 /* True means unconditionally make a BLOCK for the next scope pushed. */
400 static bool keep_next_level_flag
;
402 /* True means the next call to push_scope will be the outermost scope
403 of a function body, so do not push a new scope, merely cease
404 expecting parameter decls. */
406 static bool next_is_function_body
;
408 /* Forward declarations. */
409 static tree
lookup_name_in_scope (tree
, struct c_scope
*);
410 static tree
c_make_fname_decl (tree
, int);
411 static tree
grokdeclarator (const struct c_declarator
*,
412 struct c_declspecs
*,
413 enum decl_context
, bool, tree
*);
414 static tree
grokparms (struct c_arg_info
*, bool);
415 static void layout_array_type (tree
);
417 /* T is a statement. Add it to the statement-tree. This is the
418 C/ObjC version--C++ has a slightly different version of this
424 enum tree_code code
= TREE_CODE (t
);
426 if (CAN_HAVE_LOCATION_P (t
) && code
!= LABEL_EXPR
)
428 if (!EXPR_HAS_LOCATION (t
))
429 SET_EXPR_LOCATION (t
, input_location
);
432 if (code
== LABEL_EXPR
|| code
== CASE_LABEL_EXPR
)
433 STATEMENT_LIST_HAS_LABEL (cur_stmt_list
) = 1;
435 /* Add T to the statement-tree. Non-side-effect statements need to be
436 recorded during statement expressions. */
437 append_to_statement_list_force (t
, &cur_stmt_list
);
442 /* States indicating how grokdeclarator() should handle declspecs marked
443 with __attribute__((deprecated)). An object declared as
444 __attribute__((deprecated)) suppresses warnings of uses of other
447 enum deprecated_states
{
452 static enum deprecated_states deprecated_state
= DEPRECATED_NORMAL
;
455 c_print_identifier (FILE *file
, tree node
, int indent
)
457 print_node (file
, "symbol", I_SYMBOL_DECL (node
), indent
+ 4);
458 print_node (file
, "tag", I_TAG_DECL (node
), indent
+ 4);
459 print_node (file
, "label", I_LABEL_DECL (node
), indent
+ 4);
460 if (C_IS_RESERVED_WORD (node
))
462 tree rid
= ridpointers
[C_RID_CODE (node
)];
463 indent_to (file
, indent
+ 4);
464 fprintf (file
, "rid %p \"%s\"",
465 (void *) rid
, IDENTIFIER_POINTER (rid
));
469 /* Establish a binding between NAME, an IDENTIFIER_NODE, and DECL,
470 which may be any of several kinds of DECL or TYPE or error_mark_node,
471 in the scope SCOPE. */
473 bind (tree name
, tree decl
, struct c_scope
*scope
, bool invisible
, bool nested
)
475 struct c_binding
*b
, **here
;
477 if (binding_freelist
)
479 b
= binding_freelist
;
480 binding_freelist
= b
->prev
;
483 b
= GGC_NEW (struct c_binding
);
488 b
->depth
= scope
->depth
;
489 b
->invisible
= invisible
;
495 b
->prev
= scope
->bindings
;
501 switch (TREE_CODE (decl
))
503 case LABEL_DECL
: here
= &I_LABEL_BINDING (name
); break;
506 case RECORD_TYPE
: here
= &I_TAG_BINDING (name
); break;
512 case ERROR_MARK
: here
= &I_SYMBOL_BINDING (name
); break;
518 /* Locate the appropriate place in the chain of shadowed decls
519 to insert this binding. Normally, scope == current_scope and
520 this does nothing. */
521 while (*here
&& (*here
)->depth
> scope
->depth
)
522 here
= &(*here
)->shadowed
;
528 /* Clear the binding structure B, stick it on the binding_freelist,
529 and return the former value of b->prev. This is used by pop_scope
530 and get_parm_info to iterate destructively over all the bindings
531 from a given scope. */
532 static struct c_binding
*
533 free_binding_and_advance (struct c_binding
*b
)
535 struct c_binding
*prev
= b
->prev
;
537 memset (b
, 0, sizeof (struct c_binding
));
538 b
->prev
= binding_freelist
;
539 binding_freelist
= b
;
545 /* Hook called at end of compilation to assume 1 elt
546 for a file-scope tentative array defn that wasn't complete before. */
549 c_finish_incomplete_decl (tree decl
)
551 if (TREE_CODE (decl
) == VAR_DECL
)
553 tree type
= TREE_TYPE (decl
);
554 if (type
!= error_mark_node
555 && TREE_CODE (type
) == ARRAY_TYPE
556 && !DECL_EXTERNAL (decl
)
557 && TYPE_DOMAIN (type
) == 0)
559 warning (0, "array %q+D assumed to have one element", decl
);
561 complete_array_type (&TREE_TYPE (decl
), NULL_TREE
, true);
563 layout_decl (decl
, 0);
568 /* The Objective-C front-end often needs to determine the current scope. */
571 objc_get_current_scope (void)
573 return current_scope
;
576 /* The following function is used only by Objective-C. It needs to live here
577 because it accesses the innards of c_scope. */
580 objc_mark_locals_volatile (void *enclosing_blk
)
582 struct c_scope
*scope
;
585 for (scope
= current_scope
;
586 scope
&& scope
!= enclosing_blk
;
587 scope
= scope
->outer
)
589 for (b
= scope
->bindings
; b
; b
= b
->prev
)
590 objc_volatilize_decl (b
->decl
);
592 /* Do not climb up past the current function. */
593 if (scope
->function_body
)
598 /* Nonzero if we are currently in file scope. */
601 global_bindings_p (void)
603 return current_scope
== file_scope
&& !c_override_global_bindings_to_false
;
607 keep_next_level (void)
609 keep_next_level_flag
= true;
612 /* Identify this scope as currently being filled with parameters. */
615 declare_parm_level (void)
617 current_scope
->parm_flag
= true;
623 if (next_is_function_body
)
625 /* This is the transition from the parameters to the top level
626 of the function body. These are the same scope
627 (C99 6.2.1p4,6) so we do not push another scope structure.
628 next_is_function_body is set only by store_parm_decls, which
629 in turn is called when and only when we are about to
630 encounter the opening curly brace for the function body.
632 The outermost block of a function always gets a BLOCK node,
633 because the debugging output routines expect that each
634 function has at least one BLOCK. */
635 current_scope
->parm_flag
= false;
636 current_scope
->function_body
= true;
637 current_scope
->keep
= true;
638 current_scope
->outer_function
= current_function_scope
;
639 current_function_scope
= current_scope
;
641 keep_next_level_flag
= false;
642 next_is_function_body
= false;
646 struct c_scope
*scope
;
649 scope
= scope_freelist
;
650 scope_freelist
= scope
->outer
;
653 scope
= GGC_CNEW (struct c_scope
);
655 scope
->keep
= keep_next_level_flag
;
656 scope
->outer
= current_scope
;
657 scope
->depth
= current_scope
? (current_scope
->depth
+ 1) : 0;
659 /* Check for scope depth overflow. Unlikely (2^28 == 268,435,456) but
661 if (current_scope
&& scope
->depth
== 0)
664 sorry ("GCC supports only %u nested scopes", scope
->depth
);
667 current_scope
= scope
;
668 keep_next_level_flag
= false;
672 /* Set the TYPE_CONTEXT of all of TYPE's variants to CONTEXT. */
675 set_type_context (tree type
, tree context
)
677 for (type
= TYPE_MAIN_VARIANT (type
); type
;
678 type
= TYPE_NEXT_VARIANT (type
))
679 TYPE_CONTEXT (type
) = context
;
682 /* Exit a scope. Restore the state of the identifier-decl mappings
683 that were in effect when this scope was entered. Return a BLOCK
684 node containing all the DECLs in this scope that are of interest
685 to debug info generation. */
690 struct c_scope
*scope
= current_scope
;
691 tree block
, context
, p
;
694 bool functionbody
= scope
->function_body
;
695 bool keep
= functionbody
|| scope
->keep
|| scope
->bindings
;
697 c_end_vm_scope (scope
->depth
);
699 /* If appropriate, create a BLOCK to record the decls for the life
704 block
= make_node (BLOCK
);
705 BLOCK_SUBBLOCKS (block
) = scope
->blocks
;
706 TREE_USED (block
) = 1;
708 /* In each subblock, record that this is its superior. */
709 for (p
= scope
->blocks
; p
; p
= TREE_CHAIN (p
))
710 BLOCK_SUPERCONTEXT (p
) = block
;
712 BLOCK_VARS (block
) = 0;
715 /* The TYPE_CONTEXTs for all of the tagged types belonging to this
716 scope must be set so that they point to the appropriate
717 construct, i.e. either to the current FUNCTION_DECL node, or
718 else to the BLOCK node we just constructed.
720 Note that for tagged types whose scope is just the formal
721 parameter list for some function type specification, we can't
722 properly set their TYPE_CONTEXTs here, because we don't have a
723 pointer to the appropriate FUNCTION_TYPE node readily available
724 to us. For those cases, the TYPE_CONTEXTs of the relevant tagged
725 type nodes get set in `grokdeclarator' as soon as we have created
726 the FUNCTION_TYPE node which will represent the "scope" for these
727 "parameter list local" tagged types. */
728 if (scope
->function_body
)
729 context
= current_function_decl
;
730 else if (scope
== file_scope
)
732 tree file_decl
= build_decl (TRANSLATION_UNIT_DECL
, 0, 0);
733 TREE_CHAIN (file_decl
) = all_translation_units
;
734 all_translation_units
= file_decl
;
740 /* Clear all bindings in this scope. */
741 for (b
= scope
->bindings
; b
; b
= free_binding_and_advance (b
))
744 switch (TREE_CODE (p
))
747 /* Warnings for unused labels, errors for undefined labels. */
748 if (TREE_USED (p
) && !DECL_INITIAL (p
))
750 error ("label %q+D used but not defined", p
);
751 DECL_INITIAL (p
) = error_mark_node
;
754 warn_for_unused_label (p
);
756 /* Labels go in BLOCK_VARS. */
757 TREE_CHAIN (p
) = BLOCK_VARS (block
);
758 BLOCK_VARS (block
) = p
;
759 gcc_assert (I_LABEL_BINDING (b
->id
) == b
);
760 I_LABEL_BINDING (b
->id
) = b
->shadowed
;
766 set_type_context (p
, context
);
768 /* Types may not have tag-names, in which case the type
769 appears in the bindings list with b->id NULL. */
772 gcc_assert (I_TAG_BINDING (b
->id
) == b
);
773 I_TAG_BINDING (b
->id
) = b
->shadowed
;
778 /* Propagate TREE_ADDRESSABLE from nested functions to their
779 containing functions. */
780 if (!TREE_ASM_WRITTEN (p
)
781 && DECL_INITIAL (p
) != 0
782 && TREE_ADDRESSABLE (p
)
783 && DECL_ABSTRACT_ORIGIN (p
) != 0
784 && DECL_ABSTRACT_ORIGIN (p
) != p
)
785 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (p
)) = 1;
786 if (!DECL_EXTERNAL (p
)
788 && scope
!= file_scope
789 && scope
!= external_scope
)
791 error ("nested function %q+D declared but never defined", p
);
792 undef_nested_function
= true;
794 /* C99 6.7.4p6: "a function with external linkage... declared
795 with an inline function specifier ... shall also be defined in the
796 same translation unit." */
797 else if (DECL_DECLARED_INLINE_P (p
)
800 && !flag_gnu89_inline
)
801 pedwarn ("inline function %q+D declared but never defined", p
);
806 /* Warnings for unused variables. */
808 && !TREE_NO_WARNING (p
)
809 && !DECL_IN_SYSTEM_HEADER (p
)
811 && !DECL_ARTIFICIAL (p
)
812 && scope
!= file_scope
813 && scope
!= external_scope
)
814 warning (OPT_Wunused_variable
, "unused variable %q+D", p
);
818 error ("type of array %q+D completed incompatibly with"
819 " implicit initialization", p
);
826 /* All of these go in BLOCK_VARS, but only if this is the
827 binding in the home scope. */
830 TREE_CHAIN (p
) = BLOCK_VARS (block
);
831 BLOCK_VARS (block
) = p
;
833 /* If this is the file scope, and we are processing more
834 than one translation unit in this compilation, set
835 DECL_CONTEXT of each decl to the TRANSLATION_UNIT_DECL.
836 This makes same_translation_unit_p work, and causes
837 static declarations to be given disambiguating suffixes. */
838 if (scope
== file_scope
&& num_in_fnames
> 1)
840 DECL_CONTEXT (p
) = context
;
841 if (TREE_CODE (p
) == TYPE_DECL
)
842 set_type_context (TREE_TYPE (p
), context
);
846 /* Parameters go in DECL_ARGUMENTS, not BLOCK_VARS, and have
847 already been put there by store_parm_decls. Unused-
848 parameter warnings are handled by function.c.
849 error_mark_node obviously does not go in BLOCK_VARS and
850 does not get unused-variable warnings. */
853 /* It is possible for a decl not to have a name. We get
854 here with b->id NULL in this case. */
857 gcc_assert (I_SYMBOL_BINDING (b
->id
) == b
);
858 I_SYMBOL_BINDING (b
->id
) = b
->shadowed
;
859 if (b
->shadowed
&& b
->shadowed
->type
)
860 TREE_TYPE (b
->shadowed
->decl
) = b
->shadowed
->type
;
870 /* Dispose of the block that we just made inside some higher level. */
871 if ((scope
->function_body
|| scope
== file_scope
) && context
)
873 DECL_INITIAL (context
) = block
;
874 BLOCK_SUPERCONTEXT (block
) = context
;
876 else if (scope
->outer
)
879 SCOPE_LIST_APPEND (scope
->outer
, blocks
, block
);
880 /* If we did not make a block for the scope just exited, any
881 blocks made for inner scopes must be carried forward so they
882 will later become subblocks of something else. */
883 else if (scope
->blocks
)
884 SCOPE_LIST_CONCAT (scope
->outer
, blocks
, scope
, blocks
);
887 /* Pop the current scope, and free the structure for reuse. */
888 current_scope
= scope
->outer
;
889 if (scope
->function_body
)
890 current_function_scope
= scope
->outer_function
;
892 memset (scope
, 0, sizeof (struct c_scope
));
893 scope
->outer
= scope_freelist
;
894 scope_freelist
= scope
;
900 push_file_scope (void)
908 file_scope
= current_scope
;
910 start_fname_decls ();
912 for (decl
= visible_builtins
; decl
; decl
= TREE_CHAIN (decl
))
913 bind (DECL_NAME (decl
), decl
, file_scope
,
914 /*invisible=*/false, /*nested=*/true);
918 pop_file_scope (void)
920 /* In case there were missing closebraces, get us back to the global
922 while (current_scope
!= file_scope
)
925 /* __FUNCTION__ is defined at file scope (""). This
926 call may not be necessary as my tests indicate it
927 still works without it. */
928 finish_fname_decls ();
930 /* This is the point to write out a PCH if we're doing that.
931 In that case we do not want to do anything else. */
934 c_common_write_pch ();
938 /* Pop off the file scope and close this translation unit. */
942 maybe_apply_pending_pragma_weaks ();
943 cgraph_finalize_compilation_unit ();
946 /* Insert BLOCK at the end of the list of subblocks of the current
947 scope. This is used when a BIND_EXPR is expanded, to handle the
948 BLOCK node inside the BIND_EXPR. */
951 insert_block (tree block
)
953 TREE_USED (block
) = 1;
954 SCOPE_LIST_APPEND (current_scope
, blocks
, block
);
957 /* Push a definition or a declaration of struct, union or enum tag "name".
958 "type" should be the type node.
959 We assume that the tag "name" is not already defined.
961 Note that the definition may really be just a forward reference.
962 In that case, the TYPE_SIZE will be zero. */
965 pushtag (tree name
, tree type
)
967 /* Record the identifier as the type's name if it has none. */
968 if (name
&& !TYPE_NAME (type
))
969 TYPE_NAME (type
) = name
;
970 bind (name
, type
, current_scope
, /*invisible=*/false, /*nested=*/false);
972 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
973 tagged type we just added to the current scope. This fake
974 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
975 to output a representation of a tagged type, and it also gives
976 us a convenient place to record the "scope start" address for the
979 TYPE_STUB_DECL (type
) = pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, type
));
981 /* An approximation for now, so we can tell this is a function-scope tag.
982 This will be updated in pop_scope. */
983 TYPE_CONTEXT (type
) = DECL_CONTEXT (TYPE_STUB_DECL (type
));
986 /* Subroutine of compare_decls. Allow harmless mismatches in return
987 and argument types provided that the type modes match. This function
988 return a unified type given a suitable match, and 0 otherwise. */
991 match_builtin_function_types (tree newtype
, tree oldtype
)
993 tree newrettype
, oldrettype
;
994 tree newargs
, oldargs
;
995 tree trytype
, tryargs
;
997 /* Accept the return type of the new declaration if same modes. */
998 oldrettype
= TREE_TYPE (oldtype
);
999 newrettype
= TREE_TYPE (newtype
);
1001 if (TYPE_MODE (oldrettype
) != TYPE_MODE (newrettype
))
1004 oldargs
= TYPE_ARG_TYPES (oldtype
);
1005 newargs
= TYPE_ARG_TYPES (newtype
);
1008 while (oldargs
|| newargs
)
1012 || !TREE_VALUE (oldargs
)
1013 || !TREE_VALUE (newargs
)
1014 || TYPE_MODE (TREE_VALUE (oldargs
))
1015 != TYPE_MODE (TREE_VALUE (newargs
)))
1018 oldargs
= TREE_CHAIN (oldargs
);
1019 newargs
= TREE_CHAIN (newargs
);
1022 trytype
= build_function_type (newrettype
, tryargs
);
1023 return build_type_attribute_variant (trytype
, TYPE_ATTRIBUTES (oldtype
));
1026 /* Subroutine of diagnose_mismatched_decls. Check for function type
1027 mismatch involving an empty arglist vs a nonempty one and give clearer
1030 diagnose_arglist_conflict (tree newdecl
, tree olddecl
,
1031 tree newtype
, tree oldtype
)
1035 if (TREE_CODE (olddecl
) != FUNCTION_DECL
1036 || !comptypes (TREE_TYPE (oldtype
), TREE_TYPE (newtype
))
1037 || !((TYPE_ARG_TYPES (oldtype
) == 0 && DECL_INITIAL (olddecl
) == 0)
1039 (TYPE_ARG_TYPES (newtype
) == 0 && DECL_INITIAL (newdecl
) == 0)))
1042 t
= TYPE_ARG_TYPES (oldtype
);
1044 t
= TYPE_ARG_TYPES (newtype
);
1045 for (; t
; t
= TREE_CHAIN (t
))
1047 tree type
= TREE_VALUE (t
);
1049 if (TREE_CHAIN (t
) == 0
1050 && TYPE_MAIN_VARIANT (type
) != void_type_node
)
1052 inform ("a parameter list with an ellipsis can%'t match "
1053 "an empty parameter name list declaration");
1057 if (c_type_promotes_to (type
) != type
)
1059 inform ("an argument type that has a default promotion can%'t match "
1060 "an empty parameter name list declaration");
1066 /* Another subroutine of diagnose_mismatched_decls. OLDDECL is an
1067 old-style function definition, NEWDECL is a prototype declaration.
1068 Diagnose inconsistencies in the argument list. Returns TRUE if
1069 the prototype is compatible, FALSE if not. */
1071 validate_proto_after_old_defn (tree newdecl
, tree newtype
, tree oldtype
)
1073 tree newargs
, oldargs
;
1076 #define END_OF_ARGLIST(t) ((t) == void_type_node)
1078 oldargs
= TYPE_ACTUAL_ARG_TYPES (oldtype
);
1079 newargs
= TYPE_ARG_TYPES (newtype
);
1084 tree oldargtype
= TREE_VALUE (oldargs
);
1085 tree newargtype
= TREE_VALUE (newargs
);
1087 if (oldargtype
== error_mark_node
|| newargtype
== error_mark_node
)
1090 oldargtype
= TYPE_MAIN_VARIANT (oldargtype
);
1091 newargtype
= TYPE_MAIN_VARIANT (newargtype
);
1093 if (END_OF_ARGLIST (oldargtype
) && END_OF_ARGLIST (newargtype
))
1096 /* Reaching the end of just one list means the two decls don't
1097 agree on the number of arguments. */
1098 if (END_OF_ARGLIST (oldargtype
))
1100 error ("prototype for %q+D declares more arguments "
1101 "than previous old-style definition", newdecl
);
1104 else if (END_OF_ARGLIST (newargtype
))
1106 error ("prototype for %q+D declares fewer arguments "
1107 "than previous old-style definition", newdecl
);
1111 /* Type for passing arg must be consistent with that declared
1113 else if (!comptypes (oldargtype
, newargtype
))
1115 error ("prototype for %q+D declares argument %d"
1116 " with incompatible type",
1121 oldargs
= TREE_CHAIN (oldargs
);
1122 newargs
= TREE_CHAIN (newargs
);
1126 /* If we get here, no errors were found, but do issue a warning
1127 for this poor-style construct. */
1128 warning (0, "prototype for %q+D follows non-prototype definition",
1131 #undef END_OF_ARGLIST
1134 /* Subroutine of diagnose_mismatched_decls. Report the location of DECL,
1135 first in a pair of mismatched declarations, using the diagnostic
1138 locate_old_decl (tree decl
, void (*diag
)(const char *, ...) ATTRIBUTE_GCC_CDIAG(1,2))
1140 if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_BUILT_IN (decl
))
1142 else if (DECL_INITIAL (decl
))
1143 diag (G_("previous definition of %q+D was here"), decl
);
1144 else if (C_DECL_IMPLICIT (decl
))
1145 diag (G_("previous implicit declaration of %q+D was here"), decl
);
1147 diag (G_("previous declaration of %q+D was here"), decl
);
1150 /* Subroutine of duplicate_decls. Compare NEWDECL to OLDDECL.
1151 Returns true if the caller should proceed to merge the two, false
1152 if OLDDECL should simply be discarded. As a side effect, issues
1153 all necessary diagnostics for invalid or poor-style combinations.
1154 If it returns true, writes the types of NEWDECL and OLDDECL to
1155 *NEWTYPEP and *OLDTYPEP - these may have been adjusted from
1156 TREE_TYPE (NEWDECL, OLDDECL) respectively. */
1159 diagnose_mismatched_decls (tree newdecl
, tree olddecl
,
1160 tree
*newtypep
, tree
*oldtypep
)
1162 tree newtype
, oldtype
;
1163 bool pedwarned
= false;
1164 bool warned
= false;
1167 #define DECL_EXTERN_INLINE(DECL) (DECL_DECLARED_INLINE_P (DECL) \
1168 && DECL_EXTERNAL (DECL))
1170 /* If we have error_mark_node for either decl or type, just discard
1171 the previous decl - we're in an error cascade already. */
1172 if (olddecl
== error_mark_node
|| newdecl
== error_mark_node
)
1174 *oldtypep
= oldtype
= TREE_TYPE (olddecl
);
1175 *newtypep
= newtype
= TREE_TYPE (newdecl
);
1176 if (oldtype
== error_mark_node
|| newtype
== error_mark_node
)
1179 /* Two different categories of symbol altogether. This is an error
1180 unless OLDDECL is a builtin. OLDDECL will be discarded in any case. */
1181 if (TREE_CODE (olddecl
) != TREE_CODE (newdecl
))
1183 if (!(TREE_CODE (olddecl
) == FUNCTION_DECL
1184 && DECL_BUILT_IN (olddecl
)
1185 && !C_DECL_DECLARED_BUILTIN (olddecl
)))
1187 error ("%q+D redeclared as different kind of symbol", newdecl
);
1188 locate_old_decl (olddecl
, error
);
1190 else if (TREE_PUBLIC (newdecl
))
1191 warning (0, "built-in function %q+D declared as non-function",
1194 warning (OPT_Wshadow
, "declaration of %q+D shadows "
1195 "a built-in function", newdecl
);
1199 /* Enumerators have no linkage, so may only be declared once in a
1201 if (TREE_CODE (olddecl
) == CONST_DECL
)
1203 error ("redeclaration of enumerator %q+D", newdecl
);
1204 locate_old_decl (olddecl
, error
);
1208 if (!comptypes (oldtype
, newtype
))
1210 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1211 && DECL_BUILT_IN (olddecl
) && !C_DECL_DECLARED_BUILTIN (olddecl
))
1213 /* Accept harmless mismatch in function types.
1214 This is for the ffs and fprintf builtins. */
1215 tree trytype
= match_builtin_function_types (newtype
, oldtype
);
1217 if (trytype
&& comptypes (newtype
, trytype
))
1218 *oldtypep
= oldtype
= trytype
;
1221 /* If types don't match for a built-in, throw away the
1222 built-in. No point in calling locate_old_decl here, it
1223 won't print anything. */
1224 warning (0, "conflicting types for built-in function %q+D",
1229 else if (TREE_CODE (olddecl
) == FUNCTION_DECL
1230 && DECL_IS_BUILTIN (olddecl
))
1232 /* A conflicting function declaration for a predeclared
1233 function that isn't actually built in. Objective C uses
1234 these. The new declaration silently overrides everything
1235 but the volatility (i.e. noreturn) indication. See also
1236 below. FIXME: Make Objective C use normal builtins. */
1237 TREE_THIS_VOLATILE (newdecl
) |= TREE_THIS_VOLATILE (olddecl
);
1240 /* Permit void foo (...) to match int foo (...) if the latter is
1241 the definition and implicit int was used. See
1242 c-torture/compile/920625-2.c. */
1243 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
&& DECL_INITIAL (newdecl
)
1244 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype
)) == void_type_node
1245 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype
)) == integer_type_node
1246 && C_FUNCTION_IMPLICIT_INT (newdecl
) && !DECL_INITIAL (olddecl
))
1248 pedwarn ("conflicting types for %q+D", newdecl
);
1249 /* Make sure we keep void as the return type. */
1250 TREE_TYPE (newdecl
) = *newtypep
= newtype
= oldtype
;
1251 C_FUNCTION_IMPLICIT_INT (newdecl
) = 0;
1254 /* Permit void foo (...) to match an earlier call to foo (...) with
1255 no declared type (thus, implicitly int). */
1256 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
1257 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype
)) == void_type_node
1258 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype
)) == integer_type_node
1259 && C_DECL_IMPLICIT (olddecl
) && !DECL_INITIAL (olddecl
))
1261 pedwarn ("conflicting types for %q+D", newdecl
);
1262 /* Make sure we keep void as the return type. */
1263 TREE_TYPE (olddecl
) = *oldtypep
= oldtype
= newtype
;
1268 if (TYPE_QUALS (newtype
) != TYPE_QUALS (oldtype
))
1269 error ("conflicting type qualifiers for %q+D", newdecl
);
1271 error ("conflicting types for %q+D", newdecl
);
1272 diagnose_arglist_conflict (newdecl
, olddecl
, newtype
, oldtype
);
1273 locate_old_decl (olddecl
, error
);
1278 /* Redeclaration of a type is a constraint violation (6.7.2.3p1),
1279 but silently ignore the redeclaration if either is in a system
1280 header. (Conflicting redeclarations were handled above.) */
1281 if (TREE_CODE (newdecl
) == TYPE_DECL
)
1283 if (DECL_IN_SYSTEM_HEADER (newdecl
) || DECL_IN_SYSTEM_HEADER (olddecl
))
1284 return true; /* Allow OLDDECL to continue in use. */
1286 error ("redefinition of typedef %q+D", newdecl
);
1287 locate_old_decl (olddecl
, error
);
1291 /* Function declarations can either be 'static' or 'extern' (no
1292 qualifier is equivalent to 'extern' - C99 6.2.2p5) and therefore
1293 can never conflict with each other on account of linkage
1294 (6.2.2p4). Multiple definitions are not allowed (6.9p3,5) but
1295 gnu89 mode permits two definitions if one is 'extern inline' and
1296 one is not. The non- extern-inline definition supersedes the
1297 extern-inline definition. */
1299 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1301 /* If you declare a built-in function name as static, or
1302 define the built-in with an old-style definition (so we
1303 can't validate the argument list) the built-in definition is
1304 overridden, but optionally warn this was a bad choice of name. */
1305 if (DECL_BUILT_IN (olddecl
)
1306 && !C_DECL_DECLARED_BUILTIN (olddecl
)
1307 && (!TREE_PUBLIC (newdecl
)
1308 || (DECL_INITIAL (newdecl
)
1309 && !TYPE_ARG_TYPES (TREE_TYPE (newdecl
)))))
1311 warning (OPT_Wshadow
, "declaration of %q+D shadows "
1312 "a built-in function", newdecl
);
1313 /* Discard the old built-in function. */
1317 if (DECL_INITIAL (newdecl
))
1319 if (DECL_INITIAL (olddecl
))
1321 /* If both decls are in the same TU and the new declaration
1322 isn't overriding an extern inline reject the new decl.
1323 In c99, no overriding is allowed in the same translation
1325 if ((!DECL_EXTERN_INLINE (olddecl
)
1326 || DECL_EXTERN_INLINE (newdecl
)
1327 || (!flag_gnu89_inline
1328 && (!DECL_DECLARED_INLINE_P (olddecl
)
1329 || !lookup_attribute ("gnu_inline",
1330 DECL_ATTRIBUTES (olddecl
)))
1331 && (!DECL_DECLARED_INLINE_P (newdecl
)
1332 || !lookup_attribute ("gnu_inline",
1333 DECL_ATTRIBUTES (newdecl
))))
1335 && same_translation_unit_p (newdecl
, olddecl
))
1337 error ("redefinition of %q+D", newdecl
);
1338 locate_old_decl (olddecl
, error
);
1343 /* If we have a prototype after an old-style function definition,
1344 the argument types must be checked specially. */
1345 else if (DECL_INITIAL (olddecl
)
1346 && !TYPE_ARG_TYPES (oldtype
) && TYPE_ARG_TYPES (newtype
)
1347 && TYPE_ACTUAL_ARG_TYPES (oldtype
)
1348 && !validate_proto_after_old_defn (newdecl
, newtype
, oldtype
))
1350 locate_old_decl (olddecl
, error
);
1353 /* A non-static declaration (even an "extern") followed by a
1354 static declaration is undefined behavior per C99 6.2.2p3-5,7.
1355 The same is true for a static forward declaration at block
1356 scope followed by a non-static declaration/definition at file
1357 scope. Static followed by non-static at the same scope is
1358 not undefined behavior, and is the most convenient way to get
1359 some effects (see e.g. what unwind-dw2-fde-glibc.c does to
1360 the definition of _Unwind_Find_FDE in unwind-dw2-fde.c), but
1361 we do diagnose it if -Wtraditional. */
1362 if (TREE_PUBLIC (olddecl
) && !TREE_PUBLIC (newdecl
))
1364 /* Two exceptions to the rule. If olddecl is an extern
1365 inline, or a predeclared function that isn't actually
1366 built in, newdecl silently overrides olddecl. The latter
1367 occur only in Objective C; see also above. (FIXME: Make
1368 Objective C use normal builtins.) */
1369 if (!DECL_IS_BUILTIN (olddecl
)
1370 && !DECL_EXTERN_INLINE (olddecl
))
1372 error ("static declaration of %q+D follows "
1373 "non-static declaration", newdecl
);
1374 locate_old_decl (olddecl
, error
);
1378 else if (TREE_PUBLIC (newdecl
) && !TREE_PUBLIC (olddecl
))
1380 if (DECL_CONTEXT (olddecl
))
1382 error ("non-static declaration of %q+D follows "
1383 "static declaration", newdecl
);
1384 locate_old_decl (olddecl
, error
);
1387 else if (warn_traditional
)
1389 warning (OPT_Wtraditional
, "non-static declaration of %q+D "
1390 "follows static declaration", newdecl
);
1395 /* Make sure gnu_inline attribute is either not present, or
1396 present on all inline decls. */
1397 if (DECL_DECLARED_INLINE_P (olddecl
)
1398 && DECL_DECLARED_INLINE_P (newdecl
))
1400 bool newa
= lookup_attribute ("gnu_inline",
1401 DECL_ATTRIBUTES (newdecl
)) != NULL
;
1402 bool olda
= lookup_attribute ("gnu_inline",
1403 DECL_ATTRIBUTES (olddecl
)) != NULL
;
1406 error ("%<gnu_inline%> attribute present on %q+D",
1407 newa
? newdecl
: olddecl
);
1408 error ("%Jbut not here", newa
? olddecl
: newdecl
);
1412 else if (TREE_CODE (newdecl
) == VAR_DECL
)
1414 /* Only variables can be thread-local, and all declarations must
1415 agree on this property. */
1416 if (C_DECL_THREADPRIVATE_P (olddecl
) && !DECL_THREAD_LOCAL_P (newdecl
))
1418 /* Nothing to check. Since OLDDECL is marked threadprivate
1419 and NEWDECL does not have a thread-local attribute, we
1420 will merge the threadprivate attribute into NEWDECL. */
1423 else if (DECL_THREAD_LOCAL_P (newdecl
) != DECL_THREAD_LOCAL_P (olddecl
))
1425 if (DECL_THREAD_LOCAL_P (newdecl
))
1426 error ("thread-local declaration of %q+D follows "
1427 "non-thread-local declaration", newdecl
);
1429 error ("non-thread-local declaration of %q+D follows "
1430 "thread-local declaration", newdecl
);
1432 locate_old_decl (olddecl
, error
);
1436 /* Multiple initialized definitions are not allowed (6.9p3,5). */
1437 if (DECL_INITIAL (newdecl
) && DECL_INITIAL (olddecl
))
1439 error ("redefinition of %q+D", newdecl
);
1440 locate_old_decl (olddecl
, error
);
1444 /* Objects declared at file scope: if the first declaration had
1445 external linkage (even if it was an external reference) the
1446 second must have external linkage as well, or the behavior is
1447 undefined. If the first declaration had internal linkage, then
1448 the second must too, or else be an external reference (in which
1449 case the composite declaration still has internal linkage).
1450 As for function declarations, we warn about the static-then-
1451 extern case only for -Wtraditional. See generally 6.2.2p3-5,7. */
1452 if (DECL_FILE_SCOPE_P (newdecl
)
1453 && TREE_PUBLIC (newdecl
) != TREE_PUBLIC (olddecl
))
1455 if (DECL_EXTERNAL (newdecl
))
1457 if (!DECL_FILE_SCOPE_P (olddecl
))
1459 error ("extern declaration of %q+D follows "
1460 "declaration with no linkage", newdecl
);
1461 locate_old_decl (olddecl
, error
);
1464 else if (warn_traditional
)
1466 warning (OPT_Wtraditional
, "non-static declaration of %q+D "
1467 "follows static declaration", newdecl
);
1473 if (TREE_PUBLIC (newdecl
))
1474 error ("non-static declaration of %q+D follows "
1475 "static declaration", newdecl
);
1477 error ("static declaration of %q+D follows "
1478 "non-static declaration", newdecl
);
1480 locate_old_decl (olddecl
, error
);
1484 /* Two objects with the same name declared at the same block
1485 scope must both be external references (6.7p3). */
1486 else if (!DECL_FILE_SCOPE_P (newdecl
))
1488 if (DECL_EXTERNAL (newdecl
))
1490 /* Extern with initializer at block scope, which will
1491 already have received an error. */
1493 else if (DECL_EXTERNAL (olddecl
))
1495 error ("declaration of %q+D with no linkage follows "
1496 "extern declaration", newdecl
);
1497 locate_old_decl (olddecl
, error
);
1501 error ("redeclaration of %q+D with no linkage", newdecl
);
1502 locate_old_decl (olddecl
, error
);
1510 /* All decls must agree on a visibility. */
1511 if (CODE_CONTAINS_STRUCT (TREE_CODE (newdecl
), TS_DECL_WITH_VIS
)
1512 && DECL_VISIBILITY_SPECIFIED (newdecl
) && DECL_VISIBILITY_SPECIFIED (olddecl
)
1513 && DECL_VISIBILITY (newdecl
) != DECL_VISIBILITY (olddecl
))
1515 warning (0, "redeclaration of %q+D with different visibility "
1516 "(old visibility preserved)", newdecl
);
1520 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1522 /* Diagnose inline __attribute__ ((noinline)) which is silly. */
1523 if (DECL_DECLARED_INLINE_P (newdecl
)
1524 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl
)))
1526 warning (OPT_Wattributes
, "inline declaration of %qD follows "
1527 "declaration with attribute noinline", newdecl
);
1530 else if (DECL_DECLARED_INLINE_P (olddecl
)
1531 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl
)))
1533 warning (OPT_Wattributes
, "declaration of %q+D with attribute "
1534 "noinline follows inline declaration ", newdecl
);
1538 /* Inline declaration after use or definition.
1539 ??? Should we still warn about this now we have unit-at-a-time
1540 mode and can get it right?
1541 Definitely don't complain if the decls are in different translation
1543 C99 permits this, so don't warn in that case. (The function
1544 may not be inlined everywhere in function-at-a-time mode, but
1545 we still shouldn't warn.) */
1546 if (DECL_DECLARED_INLINE_P (newdecl
) && !DECL_DECLARED_INLINE_P (olddecl
)
1547 && same_translation_unit_p (olddecl
, newdecl
)
1548 && flag_gnu89_inline
)
1550 if (TREE_USED (olddecl
))
1552 warning (0, "%q+D declared inline after being called", olddecl
);
1555 else if (DECL_INITIAL (olddecl
))
1557 warning (0, "%q+D declared inline after its definition", olddecl
);
1562 else /* PARM_DECL, VAR_DECL */
1564 /* Redeclaration of a parameter is a constraint violation (this is
1565 not explicitly stated, but follows from C99 6.7p3 [no more than
1566 one declaration of the same identifier with no linkage in the
1567 same scope, except type tags] and 6.2.2p6 [parameters have no
1568 linkage]). We must check for a forward parameter declaration,
1569 indicated by TREE_ASM_WRITTEN on the old declaration - this is
1570 an extension, the mandatory diagnostic for which is handled by
1571 mark_forward_parm_decls. */
1573 if (TREE_CODE (newdecl
) == PARM_DECL
1574 && (!TREE_ASM_WRITTEN (olddecl
) || TREE_ASM_WRITTEN (newdecl
)))
1576 error ("redefinition of parameter %q+D", newdecl
);
1577 locate_old_decl (olddecl
, error
);
1582 /* Optional warning for completely redundant decls. */
1583 if (!warned
&& !pedwarned
1584 && warn_redundant_decls
1585 /* Don't warn about a function declaration followed by a
1587 && !(TREE_CODE (newdecl
) == FUNCTION_DECL
1588 && DECL_INITIAL (newdecl
) && !DECL_INITIAL (olddecl
))
1589 /* Don't warn about redundant redeclarations of builtins. */
1590 && !(TREE_CODE (newdecl
) == FUNCTION_DECL
1591 && !DECL_BUILT_IN (newdecl
)
1592 && DECL_BUILT_IN (olddecl
)
1593 && !C_DECL_DECLARED_BUILTIN (olddecl
))
1594 /* Don't warn about an extern followed by a definition. */
1595 && !(DECL_EXTERNAL (olddecl
) && !DECL_EXTERNAL (newdecl
))
1596 /* Don't warn about forward parameter decls. */
1597 && !(TREE_CODE (newdecl
) == PARM_DECL
1598 && TREE_ASM_WRITTEN (olddecl
) && !TREE_ASM_WRITTEN (newdecl
))
1599 /* Don't warn about a variable definition following a declaration. */
1600 && !(TREE_CODE (newdecl
) == VAR_DECL
1601 && DECL_INITIAL (newdecl
) && !DECL_INITIAL (olddecl
)))
1603 warning (OPT_Wredundant_decls
, "redundant redeclaration of %q+D",
1608 /* Report location of previous decl/defn in a consistent manner. */
1609 if (warned
|| pedwarned
)
1610 locate_old_decl (olddecl
, pedwarned
? pedwarn
: warning0
);
1612 #undef DECL_EXTERN_INLINE
1617 /* Subroutine of duplicate_decls. NEWDECL has been found to be
1618 consistent with OLDDECL, but carries new information. Merge the
1619 new information into OLDDECL. This function issues no
1623 merge_decls (tree newdecl
, tree olddecl
, tree newtype
, tree oldtype
)
1625 bool new_is_definition
= (TREE_CODE (newdecl
) == FUNCTION_DECL
1626 && DECL_INITIAL (newdecl
) != 0);
1627 bool new_is_prototype
= (TREE_CODE (newdecl
) == FUNCTION_DECL
1628 && TYPE_ARG_TYPES (TREE_TYPE (newdecl
)) != 0);
1629 bool old_is_prototype
= (TREE_CODE (olddecl
) == FUNCTION_DECL
1630 && TYPE_ARG_TYPES (TREE_TYPE (olddecl
)) != 0);
1631 bool extern_changed
= false;
1633 /* For real parm decl following a forward decl, rechain the old decl
1634 in its new location and clear TREE_ASM_WRITTEN (it's not a
1635 forward decl anymore). */
1636 if (TREE_CODE (newdecl
) == PARM_DECL
1637 && TREE_ASM_WRITTEN (olddecl
) && !TREE_ASM_WRITTEN (newdecl
))
1639 struct c_binding
*b
, **here
;
1641 for (here
= ¤t_scope
->bindings
; *here
; here
= &(*here
)->prev
)
1642 if ((*here
)->decl
== olddecl
)
1649 b
->prev
= current_scope
->bindings
;
1650 current_scope
->bindings
= b
;
1652 TREE_ASM_WRITTEN (olddecl
) = 0;
1655 DECL_ATTRIBUTES (newdecl
)
1656 = targetm
.merge_decl_attributes (olddecl
, newdecl
);
1658 /* Merge the data types specified in the two decls. */
1660 = TREE_TYPE (olddecl
)
1661 = composite_type (newtype
, oldtype
);
1663 /* Lay the type out, unless already done. */
1664 if (!comptypes (oldtype
, TREE_TYPE (newdecl
)))
1666 if (TREE_TYPE (newdecl
) != error_mark_node
)
1667 layout_type (TREE_TYPE (newdecl
));
1668 if (TREE_CODE (newdecl
) != FUNCTION_DECL
1669 && TREE_CODE (newdecl
) != TYPE_DECL
1670 && TREE_CODE (newdecl
) != CONST_DECL
)
1671 layout_decl (newdecl
, 0);
1675 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1676 DECL_SIZE (newdecl
) = DECL_SIZE (olddecl
);
1677 DECL_SIZE_UNIT (newdecl
) = DECL_SIZE_UNIT (olddecl
);
1678 DECL_MODE (newdecl
) = DECL_MODE (olddecl
);
1679 if (TREE_CODE (olddecl
) != FUNCTION_DECL
)
1680 if (DECL_ALIGN (olddecl
) > DECL_ALIGN (newdecl
))
1682 DECL_ALIGN (newdecl
) = DECL_ALIGN (olddecl
);
1683 DECL_USER_ALIGN (newdecl
) |= DECL_ALIGN (olddecl
);
1688 /* Merge the type qualifiers. */
1689 if (TREE_READONLY (newdecl
))
1690 TREE_READONLY (olddecl
) = 1;
1692 if (TREE_THIS_VOLATILE (newdecl
))
1693 TREE_THIS_VOLATILE (olddecl
) = 1;
1695 /* Merge deprecatedness. */
1696 if (TREE_DEPRECATED (newdecl
))
1697 TREE_DEPRECATED (olddecl
) = 1;
1699 /* Keep source location of definition rather than declaration and of
1700 prototype rather than non-prototype unless that prototype is
1702 if ((DECL_INITIAL (newdecl
) == 0 && DECL_INITIAL (olddecl
) != 0)
1703 || (old_is_prototype
&& !new_is_prototype
1704 && !C_DECL_BUILTIN_PROTOTYPE (olddecl
)))
1705 DECL_SOURCE_LOCATION (newdecl
) = DECL_SOURCE_LOCATION (olddecl
);
1707 /* Merge the initialization information. */
1708 if (DECL_INITIAL (newdecl
) == 0)
1709 DECL_INITIAL (newdecl
) = DECL_INITIAL (olddecl
);
1711 /* Merge the threadprivate attribute. */
1712 if (TREE_CODE (olddecl
) == VAR_DECL
&& C_DECL_THREADPRIVATE_P (olddecl
))
1714 DECL_TLS_MODEL (newdecl
) = DECL_TLS_MODEL (olddecl
);
1715 C_DECL_THREADPRIVATE_P (newdecl
) = 1;
1718 if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl
), TS_DECL_WITH_VIS
))
1720 /* Merge the unused-warning information. */
1721 if (DECL_IN_SYSTEM_HEADER (olddecl
))
1722 DECL_IN_SYSTEM_HEADER (newdecl
) = 1;
1723 else if (DECL_IN_SYSTEM_HEADER (newdecl
))
1724 DECL_IN_SYSTEM_HEADER (olddecl
) = 1;
1726 /* Merge the section attribute.
1727 We want to issue an error if the sections conflict but that
1728 must be done later in decl_attributes since we are called
1729 before attributes are assigned. */
1730 if (DECL_SECTION_NAME (newdecl
) == NULL_TREE
)
1731 DECL_SECTION_NAME (newdecl
) = DECL_SECTION_NAME (olddecl
);
1733 /* Copy the assembler name.
1734 Currently, it can only be defined in the prototype. */
1735 COPY_DECL_ASSEMBLER_NAME (olddecl
, newdecl
);
1737 /* Use visibility of whichever declaration had it specified */
1738 if (DECL_VISIBILITY_SPECIFIED (olddecl
))
1740 DECL_VISIBILITY (newdecl
) = DECL_VISIBILITY (olddecl
);
1741 DECL_VISIBILITY_SPECIFIED (newdecl
) = 1;
1744 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1746 DECL_STATIC_CONSTRUCTOR(newdecl
) |= DECL_STATIC_CONSTRUCTOR(olddecl
);
1747 DECL_STATIC_DESTRUCTOR (newdecl
) |= DECL_STATIC_DESTRUCTOR (olddecl
);
1748 DECL_NO_LIMIT_STACK (newdecl
) |= DECL_NO_LIMIT_STACK (olddecl
);
1749 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl
)
1750 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl
);
1751 TREE_THIS_VOLATILE (newdecl
) |= TREE_THIS_VOLATILE (olddecl
);
1752 TREE_READONLY (newdecl
) |= TREE_READONLY (olddecl
);
1753 DECL_IS_MALLOC (newdecl
) |= DECL_IS_MALLOC (olddecl
);
1754 DECL_IS_PURE (newdecl
) |= DECL_IS_PURE (olddecl
);
1755 DECL_IS_NOVOPS (newdecl
) |= DECL_IS_NOVOPS (olddecl
);
1758 /* Merge the storage class information. */
1759 merge_weak (newdecl
, olddecl
);
1761 /* For functions, static overrides non-static. */
1762 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1764 TREE_PUBLIC (newdecl
) &= TREE_PUBLIC (olddecl
);
1765 /* This is since we don't automatically
1766 copy the attributes of NEWDECL into OLDDECL. */
1767 TREE_PUBLIC (olddecl
) = TREE_PUBLIC (newdecl
);
1768 /* If this clears `static', clear it in the identifier too. */
1769 if (!TREE_PUBLIC (olddecl
))
1770 TREE_PUBLIC (DECL_NAME (olddecl
)) = 0;
1774 /* In c99, 'extern' declaration before (or after) 'inline' means this
1775 function is not DECL_EXTERNAL, unless 'gnu_inline' attribute
1777 if (TREE_CODE (newdecl
) == FUNCTION_DECL
1778 && !flag_gnu89_inline
1779 && (DECL_DECLARED_INLINE_P (newdecl
)
1780 || DECL_DECLARED_INLINE_P (olddecl
))
1781 && (!DECL_DECLARED_INLINE_P (newdecl
)
1782 || !DECL_DECLARED_INLINE_P (olddecl
)
1783 || !DECL_EXTERNAL (olddecl
))
1784 && DECL_EXTERNAL (newdecl
)
1785 && !lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (newdecl
)))
1786 DECL_EXTERNAL (newdecl
) = 0;
1788 if (DECL_EXTERNAL (newdecl
))
1790 TREE_STATIC (newdecl
) = TREE_STATIC (olddecl
);
1791 DECL_EXTERNAL (newdecl
) = DECL_EXTERNAL (olddecl
);
1793 /* An extern decl does not override previous storage class. */
1794 TREE_PUBLIC (newdecl
) = TREE_PUBLIC (olddecl
);
1795 if (!DECL_EXTERNAL (newdecl
))
1797 DECL_CONTEXT (newdecl
) = DECL_CONTEXT (olddecl
);
1798 DECL_COMMON (newdecl
) = DECL_COMMON (olddecl
);
1803 TREE_STATIC (olddecl
) = TREE_STATIC (newdecl
);
1804 TREE_PUBLIC (olddecl
) = TREE_PUBLIC (newdecl
);
1807 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1809 /* If we're redefining a function previously defined as extern
1810 inline, make sure we emit debug info for the inline before we
1811 throw it away, in case it was inlined into a function that
1812 hasn't been written out yet. */
1813 if (new_is_definition
&& DECL_INITIAL (olddecl
))
1815 if (TREE_USED (olddecl
)
1816 /* In unit-at-a-time mode we never inline re-defined extern
1817 inline functions. */
1818 && !flag_unit_at_a_time
1819 && cgraph_function_possibly_inlined_p (olddecl
))
1820 (*debug_hooks
->outlining_inline_function
) (olddecl
);
1822 /* The new defn must not be inline. */
1823 DECL_INLINE (newdecl
) = 0;
1824 DECL_UNINLINABLE (newdecl
) = 1;
1828 /* If either decl says `inline', this fn is inline, unless
1829 its definition was passed already. */
1830 if (DECL_DECLARED_INLINE_P (newdecl
)
1831 || DECL_DECLARED_INLINE_P (olddecl
))
1832 DECL_DECLARED_INLINE_P (newdecl
) = 1;
1834 DECL_UNINLINABLE (newdecl
) = DECL_UNINLINABLE (olddecl
)
1835 = (DECL_UNINLINABLE (newdecl
) || DECL_UNINLINABLE (olddecl
));
1838 if (DECL_BUILT_IN (olddecl
))
1840 /* If redeclaring a builtin function, it stays built in.
1841 But it gets tagged as having been declared. */
1842 DECL_BUILT_IN_CLASS (newdecl
) = DECL_BUILT_IN_CLASS (olddecl
);
1843 DECL_FUNCTION_CODE (newdecl
) = DECL_FUNCTION_CODE (olddecl
);
1844 C_DECL_DECLARED_BUILTIN (newdecl
) = 1;
1845 if (new_is_prototype
)
1846 C_DECL_BUILTIN_PROTOTYPE (newdecl
) = 0;
1848 C_DECL_BUILTIN_PROTOTYPE (newdecl
)
1849 = C_DECL_BUILTIN_PROTOTYPE (olddecl
);
1852 /* Also preserve various other info from the definition. */
1853 if (!new_is_definition
)
1855 DECL_RESULT (newdecl
) = DECL_RESULT (olddecl
);
1856 DECL_INITIAL (newdecl
) = DECL_INITIAL (olddecl
);
1857 DECL_STRUCT_FUNCTION (newdecl
) = DECL_STRUCT_FUNCTION (olddecl
);
1858 DECL_SAVED_TREE (newdecl
) = DECL_SAVED_TREE (olddecl
);
1859 DECL_ARGUMENTS (newdecl
) = DECL_ARGUMENTS (olddecl
);
1861 /* Set DECL_INLINE on the declaration if we've got a body
1862 from which to instantiate. */
1863 if (DECL_INLINE (olddecl
) && !DECL_UNINLINABLE (newdecl
))
1865 DECL_INLINE (newdecl
) = 1;
1866 DECL_ABSTRACT_ORIGIN (newdecl
)
1867 = DECL_ABSTRACT_ORIGIN (olddecl
);
1872 /* If a previous declaration said inline, mark the
1873 definition as inlinable. */
1874 if (DECL_DECLARED_INLINE_P (newdecl
)
1875 && !DECL_UNINLINABLE (newdecl
))
1876 DECL_INLINE (newdecl
) = 1;
1880 extern_changed
= DECL_EXTERNAL (olddecl
) && !DECL_EXTERNAL (newdecl
);
1882 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
1883 But preserve OLDDECL's DECL_UID and DECL_CONTEXT. */
1885 unsigned olddecl_uid
= DECL_UID (olddecl
);
1886 tree olddecl_context
= DECL_CONTEXT (olddecl
);
1888 memcpy ((char *) olddecl
+ sizeof (struct tree_common
),
1889 (char *) newdecl
+ sizeof (struct tree_common
),
1890 sizeof (struct tree_decl_common
) - sizeof (struct tree_common
));
1891 switch (TREE_CODE (olddecl
))
1901 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
1902 (char *) newdecl
+ sizeof (struct tree_decl_common
),
1903 tree_code_size (TREE_CODE (olddecl
)) - sizeof (struct tree_decl_common
));
1908 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
1909 (char *) newdecl
+ sizeof (struct tree_decl_common
),
1910 sizeof (struct tree_decl_non_common
) - sizeof (struct tree_decl_common
));
1912 DECL_UID (olddecl
) = olddecl_uid
;
1913 DECL_CONTEXT (olddecl
) = olddecl_context
;
1916 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
1917 so that encode_section_info has a chance to look at the new decl
1918 flags and attributes. */
1919 if (DECL_RTL_SET_P (olddecl
)
1920 && (TREE_CODE (olddecl
) == FUNCTION_DECL
1921 || (TREE_CODE (olddecl
) == VAR_DECL
1922 && TREE_STATIC (olddecl
))))
1923 make_decl_rtl (olddecl
);
1925 /* If we changed a function from DECL_EXTERNAL to !DECL_EXTERNAL,
1926 and the definition is coming from the old version, cgraph needs
1927 to be called again. */
1928 if (extern_changed
&& !new_is_definition
1929 && TREE_CODE (olddecl
) == FUNCTION_DECL
&& DECL_INITIAL (olddecl
))
1930 cgraph_finalize_function (olddecl
, false);
1933 /* Handle when a new declaration NEWDECL has the same name as an old
1934 one OLDDECL in the same binding contour. Prints an error message
1937 If safely possible, alter OLDDECL to look like NEWDECL, and return
1938 true. Otherwise, return false. */
1941 duplicate_decls (tree newdecl
, tree olddecl
)
1943 tree newtype
= NULL
, oldtype
= NULL
;
1945 if (!diagnose_mismatched_decls (newdecl
, olddecl
, &newtype
, &oldtype
))
1947 /* Avoid `unused variable' and other warnings warnings for OLDDECL. */
1948 TREE_NO_WARNING (olddecl
) = 1;
1952 merge_decls (newdecl
, olddecl
, newtype
, oldtype
);
1957 /* Check whether decl-node NEW_DECL shadows an existing declaration. */
1959 warn_if_shadowing (tree new_decl
)
1961 struct c_binding
*b
;
1963 /* Shadow warnings wanted? */
1965 /* No shadow warnings for internally generated vars. */
1966 || DECL_IS_BUILTIN (new_decl
)
1967 /* No shadow warnings for vars made for inlining. */
1968 || DECL_FROM_INLINE (new_decl
))
1971 /* Is anything being shadowed? Invisible decls do not count. */
1972 for (b
= I_SYMBOL_BINDING (DECL_NAME (new_decl
)); b
; b
= b
->shadowed
)
1973 if (b
->decl
&& b
->decl
!= new_decl
&& !b
->invisible
)
1975 tree old_decl
= b
->decl
;
1977 if (old_decl
== error_mark_node
)
1979 warning (OPT_Wshadow
, "declaration of %q+D shadows previous "
1980 "non-variable", new_decl
);
1983 else if (TREE_CODE (old_decl
) == PARM_DECL
)
1984 warning (OPT_Wshadow
, "declaration of %q+D shadows a parameter",
1986 else if (DECL_FILE_SCOPE_P (old_decl
))
1987 warning (OPT_Wshadow
, "declaration of %q+D shadows a global "
1988 "declaration", new_decl
);
1989 else if (TREE_CODE (old_decl
) == FUNCTION_DECL
1990 && DECL_BUILT_IN (old_decl
))
1992 warning (OPT_Wshadow
, "declaration of %q+D shadows "
1993 "a built-in function", new_decl
);
1997 warning (OPT_Wshadow
, "declaration of %q+D shadows a previous local",
2000 warning (OPT_Wshadow
, "%Jshadowed declaration is here", old_decl
);
2007 /* Subroutine of pushdecl.
2009 X is a TYPE_DECL for a typedef statement. Create a brand new
2010 ..._TYPE node (which will be just a variant of the existing
2011 ..._TYPE node with identical properties) and then install X
2012 as the TYPE_NAME of this brand new (duplicate) ..._TYPE node.
2014 The whole point here is to end up with a situation where each
2015 and every ..._TYPE node the compiler creates will be uniquely
2016 associated with AT MOST one node representing a typedef name.
2017 This way, even though the compiler substitutes corresponding
2018 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
2019 early on, later parts of the compiler can always do the reverse
2020 translation and get back the corresponding typedef name. For
2023 typedef struct S MY_TYPE;
2026 Later parts of the compiler might only know that `object' was of
2027 type `struct S' if it were not for code just below. With this
2028 code however, later parts of the compiler see something like:
2030 struct S' == struct S
2031 typedef struct S' MY_TYPE;
2034 And they can then deduce (from the node for type struct S') that
2035 the original object declaration was:
2039 Being able to do this is important for proper support of protoize,
2040 and also for generating precise symbolic debugging information
2041 which takes full account of the programmer's (typedef) vocabulary.
2043 Obviously, we don't want to generate a duplicate ..._TYPE node if
2044 the TYPE_DECL node that we are now processing really represents a
2045 standard built-in type.
2047 Since all standard types are effectively declared at line zero
2048 in the source file, we can easily check to see if we are working
2049 on a standard type by checking the current value of lineno. */
2052 clone_underlying_type (tree x
)
2054 if (DECL_IS_BUILTIN (x
))
2056 if (TYPE_NAME (TREE_TYPE (x
)) == 0)
2057 TYPE_NAME (TREE_TYPE (x
)) = x
;
2059 else if (TREE_TYPE (x
) != error_mark_node
2060 && DECL_ORIGINAL_TYPE (x
) == NULL_TREE
)
2062 tree tt
= TREE_TYPE (x
);
2063 DECL_ORIGINAL_TYPE (x
) = tt
;
2064 tt
= build_variant_type_copy (tt
);
2066 TREE_USED (tt
) = TREE_USED (x
);
2071 /* Record a decl-node X as belonging to the current lexical scope.
2072 Check for errors (such as an incompatible declaration for the same
2073 name already seen in the same scope).
2075 Returns either X or an old decl for the same name.
2076 If an old decl is returned, it may have been smashed
2077 to agree with what X says. */
2082 tree name
= DECL_NAME (x
);
2083 struct c_scope
*scope
= current_scope
;
2084 struct c_binding
*b
;
2085 bool nested
= false;
2087 /* Functions need the lang_decl data. */
2088 if (TREE_CODE (x
) == FUNCTION_DECL
&& !DECL_LANG_SPECIFIC (x
))
2089 DECL_LANG_SPECIFIC (x
) = GGC_CNEW (struct lang_decl
);
2091 /* Must set DECL_CONTEXT for everything not at file scope or
2092 DECL_FILE_SCOPE_P won't work. Local externs don't count
2093 unless they have initializers (which generate code). */
2094 if (current_function_decl
2095 && ((TREE_CODE (x
) != FUNCTION_DECL
&& TREE_CODE (x
) != VAR_DECL
)
2096 || DECL_INITIAL (x
) || !DECL_EXTERNAL (x
)))
2097 DECL_CONTEXT (x
) = current_function_decl
;
2099 /* If this is of variably modified type, prevent jumping into its
2101 if ((TREE_CODE (x
) == VAR_DECL
|| TREE_CODE (x
) == TYPE_DECL
)
2102 && variably_modified_type_p (TREE_TYPE (x
), NULL_TREE
))
2103 c_begin_vm_scope (scope
->depth
);
2105 /* Anonymous decls are just inserted in the scope. */
2108 bind (name
, x
, scope
, /*invisible=*/false, /*nested=*/false);
2112 /* First, see if there is another declaration with the same name in
2113 the current scope. If there is, duplicate_decls may do all the
2114 work for us. If duplicate_decls returns false, that indicates
2115 two incompatible decls in the same scope; we are to silently
2116 replace the old one (duplicate_decls has issued all appropriate
2117 diagnostics). In particular, we should not consider possible
2118 duplicates in the external scope, or shadowing. */
2119 b
= I_SYMBOL_BINDING (name
);
2120 if (b
&& B_IN_SCOPE (b
, scope
))
2122 struct c_binding
*b_ext
, *b_use
;
2123 tree type
= TREE_TYPE (x
);
2124 tree visdecl
= b
->decl
;
2125 tree vistype
= TREE_TYPE (visdecl
);
2126 if (TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
2127 && COMPLETE_TYPE_P (TREE_TYPE (x
)))
2128 b
->inner_comp
= false;
2131 /* If this is an external linkage declaration, we should check
2132 for compatibility with the type in the external scope before
2133 setting the type at this scope based on the visible
2134 information only. */
2135 if (TREE_PUBLIC (x
) && TREE_PUBLIC (visdecl
))
2137 while (b_ext
&& !B_IN_EXTERNAL_SCOPE (b_ext
))
2138 b_ext
= b_ext
->shadowed
;
2143 TREE_TYPE (b_use
->decl
) = b_use
->type
;
2146 if (duplicate_decls (x
, b_use
->decl
))
2150 /* Save the updated type in the external scope and
2151 restore the proper type for this scope. */
2153 if (comptypes (vistype
, type
))
2154 thistype
= composite_type (vistype
, type
);
2156 thistype
= TREE_TYPE (b_use
->decl
);
2157 b_use
->type
= TREE_TYPE (b_use
->decl
);
2158 if (TREE_CODE (b_use
->decl
) == FUNCTION_DECL
2159 && DECL_BUILT_IN (b_use
->decl
))
2161 = build_type_attribute_variant (thistype
,
2164 TREE_TYPE (b_use
->decl
) = thistype
;
2169 goto skip_external_and_shadow_checks
;
2172 /* All declarations with external linkage, and all external
2173 references, go in the external scope, no matter what scope is
2174 current. However, the binding in that scope is ignored for
2175 purposes of normal name lookup. A separate binding structure is
2176 created in the requested scope; this governs the normal
2177 visibility of the symbol.
2179 The binding in the externals scope is used exclusively for
2180 detecting duplicate declarations of the same object, no matter
2181 what scope they are in; this is what we do here. (C99 6.2.7p2:
2182 All declarations that refer to the same object or function shall
2183 have compatible type; otherwise, the behavior is undefined.) */
2184 if (DECL_EXTERNAL (x
) || scope
== file_scope
)
2186 tree type
= TREE_TYPE (x
);
2189 bool type_saved
= false;
2190 if (b
&& !B_IN_EXTERNAL_SCOPE (b
)
2191 && (TREE_CODE (b
->decl
) == FUNCTION_DECL
2192 || TREE_CODE (b
->decl
) == VAR_DECL
)
2193 && DECL_FILE_SCOPE_P (b
->decl
))
2196 vistype
= TREE_TYPE (visdecl
);
2198 if (scope
!= file_scope
2199 && !DECL_IN_SYSTEM_HEADER (x
))
2200 warning (OPT_Wnested_externs
, "nested extern declaration of %qD", x
);
2202 while (b
&& !B_IN_EXTERNAL_SCOPE (b
))
2204 /* If this decl might be modified, save its type. This is
2205 done here rather than when the decl is first bound
2206 because the type may change after first binding, through
2207 being completed or through attributes being added. If we
2208 encounter multiple such decls, only the first should have
2209 its type saved; the others will already have had their
2210 proper types saved and the types will not have changed as
2211 their scopes will not have been re-entered. */
2212 if (DECL_P (b
->decl
) && DECL_FILE_SCOPE_P (b
->decl
) && !type_saved
)
2214 b
->type
= TREE_TYPE (b
->decl
);
2217 if (B_IN_FILE_SCOPE (b
)
2218 && TREE_CODE (b
->decl
) == VAR_DECL
2219 && TREE_STATIC (b
->decl
)
2220 && TREE_CODE (TREE_TYPE (b
->decl
)) == ARRAY_TYPE
2221 && !TYPE_DOMAIN (TREE_TYPE (b
->decl
))
2222 && TREE_CODE (type
) == ARRAY_TYPE
2223 && TYPE_DOMAIN (type
)
2224 && TYPE_MAX_VALUE (TYPE_DOMAIN (type
))
2225 && !integer_zerop (TYPE_MAX_VALUE (TYPE_DOMAIN (type
))))
2227 /* Array type completed in inner scope, which should be
2228 diagnosed if the completion does not have size 1 and
2229 it does not get completed in the file scope. */
2230 b
->inner_comp
= true;
2235 /* If a matching external declaration has been found, set its
2236 type to the composite of all the types of that declaration.
2237 After the consistency checks, it will be reset to the
2238 composite of the visible types only. */
2239 if (b
&& (TREE_PUBLIC (x
) || same_translation_unit_p (x
, b
->decl
))
2241 TREE_TYPE (b
->decl
) = b
->type
;
2243 /* The point of the same_translation_unit_p check here is,
2244 we want to detect a duplicate decl for a construct like
2245 foo() { extern bar(); } ... static bar(); but not if
2246 they are in different translation units. In any case,
2247 the static does not go in the externals scope. */
2249 && (TREE_PUBLIC (x
) || same_translation_unit_p (x
, b
->decl
))
2250 && duplicate_decls (x
, b
->decl
))
2255 if (comptypes (vistype
, type
))
2256 thistype
= composite_type (vistype
, type
);
2258 thistype
= TREE_TYPE (b
->decl
);
2262 b
->type
= TREE_TYPE (b
->decl
);
2263 if (TREE_CODE (b
->decl
) == FUNCTION_DECL
&& DECL_BUILT_IN (b
->decl
))
2265 = build_type_attribute_variant (thistype
,
2266 TYPE_ATTRIBUTES (b
->type
));
2267 TREE_TYPE (b
->decl
) = thistype
;
2268 bind (name
, b
->decl
, scope
, /*invisible=*/false, /*nested=*/true);
2271 else if (TREE_PUBLIC (x
))
2273 if (visdecl
&& !b
&& duplicate_decls (x
, visdecl
))
2275 /* An external declaration at block scope referring to a
2276 visible entity with internal linkage. The composite
2277 type will already be correct for this scope, so we
2278 just need to fall through to make the declaration in
2285 bind (name
, x
, external_scope
, /*invisible=*/true,
2292 if (TREE_CODE (x
) != PARM_DECL
)
2293 warn_if_shadowing (x
);
2295 skip_external_and_shadow_checks
:
2296 if (TREE_CODE (x
) == TYPE_DECL
)
2297 clone_underlying_type (x
);
2299 bind (name
, x
, scope
, /*invisible=*/false, nested
);
2301 /* If x's type is incomplete because it's based on a
2302 structure or union which has not yet been fully declared,
2303 attach it to that structure or union type, so we can go
2304 back and complete the variable declaration later, if the
2305 structure or union gets fully declared.
2307 If the input is erroneous, we can have error_mark in the type
2308 slot (e.g. "f(void a, ...)") - that doesn't count as an
2310 if (TREE_TYPE (x
) != error_mark_node
2311 && !COMPLETE_TYPE_P (TREE_TYPE (x
)))
2313 tree element
= TREE_TYPE (x
);
2315 while (TREE_CODE (element
) == ARRAY_TYPE
)
2316 element
= TREE_TYPE (element
);
2317 element
= TYPE_MAIN_VARIANT (element
);
2319 if ((TREE_CODE (element
) == RECORD_TYPE
2320 || TREE_CODE (element
) == UNION_TYPE
)
2321 && (TREE_CODE (x
) != TYPE_DECL
2322 || TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
)
2323 && !COMPLETE_TYPE_P (element
))
2324 C_TYPE_INCOMPLETE_VARS (element
)
2325 = tree_cons (NULL_TREE
, x
, C_TYPE_INCOMPLETE_VARS (element
));
2330 /* Record X as belonging to file scope.
2331 This is used only internally by the Objective-C front end,
2332 and is limited to its needs. duplicate_decls is not called;
2333 if there is any preexisting decl for this identifier, it is an ICE. */
2336 pushdecl_top_level (tree x
)
2339 bool nested
= false;
2340 gcc_assert (TREE_CODE (x
) == VAR_DECL
|| TREE_CODE (x
) == CONST_DECL
);
2342 name
= DECL_NAME (x
);
2344 gcc_assert (TREE_CODE (x
) == CONST_DECL
|| !I_SYMBOL_BINDING (name
));
2346 if (TREE_PUBLIC (x
))
2348 bind (name
, x
, external_scope
, /*invisible=*/true, /*nested=*/false);
2352 bind (name
, x
, file_scope
, /*invisible=*/false, nested
);
2358 implicit_decl_warning (tree id
, tree olddecl
)
2360 if (warn_implicit_function_declaration
)
2363 pedwarn (G_("implicit declaration of function %qE"), id
);
2365 warning (OPT_Wimplicit_function_declaration
,
2366 G_("implicit declaration of function %qE"), id
);
2368 locate_old_decl (olddecl
, inform
);
2372 /* Generate an implicit declaration for identifier FUNCTIONID as a
2373 function of type int (). */
2376 implicitly_declare (tree functionid
)
2378 struct c_binding
*b
;
2382 for (b
= I_SYMBOL_BINDING (functionid
); b
; b
= b
->shadowed
)
2384 if (B_IN_SCOPE (b
, external_scope
))
2393 if (decl
== error_mark_node
)
2396 /* FIXME: Objective-C has weird not-really-builtin functions
2397 which are supposed to be visible automatically. They wind up
2398 in the external scope because they're pushed before the file
2399 scope gets created. Catch this here and rebind them into the
2401 if (!DECL_BUILT_IN (decl
) && DECL_IS_BUILTIN (decl
))
2403 bind (functionid
, decl
, file_scope
,
2404 /*invisible=*/false, /*nested=*/true);
2409 tree newtype
= default_function_type
;
2411 TREE_TYPE (decl
) = b
->type
;
2412 /* Implicit declaration of a function already declared
2413 (somehow) in a different scope, or as a built-in.
2414 If this is the first time this has happened, warn;
2415 then recycle the old declaration but with the new type. */
2416 if (!C_DECL_IMPLICIT (decl
))
2418 implicit_decl_warning (functionid
, decl
);
2419 C_DECL_IMPLICIT (decl
) = 1;
2421 if (DECL_BUILT_IN (decl
))
2423 newtype
= build_type_attribute_variant (newtype
,
2425 (TREE_TYPE (decl
)));
2426 if (!comptypes (newtype
, TREE_TYPE (decl
)))
2428 warning (0, "incompatible implicit declaration of built-in"
2429 " function %qD", decl
);
2430 newtype
= TREE_TYPE (decl
);
2435 if (!comptypes (newtype
, TREE_TYPE (decl
)))
2437 error ("incompatible implicit declaration of function %qD",
2439 locate_old_decl (decl
, error
);
2442 b
->type
= TREE_TYPE (decl
);
2443 TREE_TYPE (decl
) = newtype
;
2444 bind (functionid
, decl
, current_scope
,
2445 /*invisible=*/false, /*nested=*/true);
2450 /* Not seen before. */
2451 decl
= build_decl (FUNCTION_DECL
, functionid
, default_function_type
);
2452 DECL_EXTERNAL (decl
) = 1;
2453 TREE_PUBLIC (decl
) = 1;
2454 C_DECL_IMPLICIT (decl
) = 1;
2455 implicit_decl_warning (functionid
, 0);
2456 asmspec_tree
= maybe_apply_renaming_pragma (decl
, /*asmname=*/NULL
);
2458 set_user_assembler_name (decl
, TREE_STRING_POINTER (asmspec_tree
));
2460 /* C89 says implicit declarations are in the innermost block.
2461 So we record the decl in the standard fashion. */
2462 decl
= pushdecl (decl
);
2464 /* No need to call objc_check_decl here - it's a function type. */
2465 rest_of_decl_compilation (decl
, 0, 0);
2467 /* Write a record describing this implicit function declaration
2468 to the prototypes file (if requested). */
2469 gen_aux_info_record (decl
, 0, 1, 0);
2471 /* Possibly apply some default attributes to this implicit declaration. */
2472 decl_attributes (&decl
, NULL_TREE
, 0);
2477 /* Issue an error message for a reference to an undeclared variable
2478 ID, including a reference to a builtin outside of function-call
2479 context. Establish a binding of the identifier to error_mark_node
2480 in an appropriate scope, which will suppress further errors for the
2481 same identifier. The error message should be given location LOC. */
2483 undeclared_variable (tree id
, location_t loc
)
2485 static bool already
= false;
2486 struct c_scope
*scope
;
2488 if (current_function_decl
== 0)
2490 error ("%H%qE undeclared here (not in a function)", &loc
, id
);
2491 scope
= current_scope
;
2495 error ("%H%qE undeclared (first use in this function)", &loc
, id
);
2499 error ("%H(Each undeclared identifier is reported only once", &loc
);
2500 error ("%Hfor each function it appears in.)", &loc
);
2504 /* If we are parsing old-style parameter decls, current_function_decl
2505 will be nonnull but current_function_scope will be null. */
2506 scope
= current_function_scope
? current_function_scope
: current_scope
;
2508 bind (id
, error_mark_node
, scope
, /*invisible=*/false, /*nested=*/false);
2511 /* Subroutine of lookup_label, declare_label, define_label: construct a
2512 LABEL_DECL with all the proper frills. */
2515 make_label (tree name
, location_t location
)
2517 tree label
= build_decl (LABEL_DECL
, name
, void_type_node
);
2519 DECL_CONTEXT (label
) = current_function_decl
;
2520 DECL_MODE (label
) = VOIDmode
;
2521 DECL_SOURCE_LOCATION (label
) = location
;
2526 /* Get the LABEL_DECL corresponding to identifier NAME as a label.
2527 Create one if none exists so far for the current function.
2528 This is called when a label is used in a goto expression or
2529 has its address taken. */
2532 lookup_label (tree name
)
2536 if (current_function_decl
== 0)
2538 error ("label %qE referenced outside of any function", name
);
2542 /* Use a label already defined or ref'd with this name, but not if
2543 it is inherited from a containing function and wasn't declared
2545 label
= I_LABEL_DECL (name
);
2546 if (label
&& (DECL_CONTEXT (label
) == current_function_decl
2547 || C_DECLARED_LABEL_FLAG (label
)))
2549 /* If the label has only been declared, update its apparent
2550 location to point here, for better diagnostics if it
2551 turns out not to have been defined. */
2552 if (!TREE_USED (label
))
2553 DECL_SOURCE_LOCATION (label
) = input_location
;
2557 /* No label binding for that identifier; make one. */
2558 label
= make_label (name
, input_location
);
2560 /* Ordinary labels go in the current function scope. */
2561 bind (name
, label
, current_function_scope
,
2562 /*invisible=*/false, /*nested=*/false);
2566 /* Make a label named NAME in the current function, shadowing silently
2567 any that may be inherited from containing functions or containing
2568 scopes. This is called for __label__ declarations. */
2571 declare_label (tree name
)
2573 struct c_binding
*b
= I_LABEL_BINDING (name
);
2576 /* Check to make sure that the label hasn't already been declared
2578 if (b
&& B_IN_CURRENT_SCOPE (b
))
2580 error ("duplicate label declaration %qE", name
);
2581 locate_old_decl (b
->decl
, error
);
2583 /* Just use the previous declaration. */
2587 label
= make_label (name
, input_location
);
2588 C_DECLARED_LABEL_FLAG (label
) = 1;
2590 /* Declared labels go in the current scope. */
2591 bind (name
, label
, current_scope
,
2592 /*invisible=*/false, /*nested=*/false);
2596 /* Define a label, specifying the location in the source file.
2597 Return the LABEL_DECL node for the label, if the definition is valid.
2598 Otherwise return 0. */
2601 define_label (location_t location
, tree name
)
2603 /* Find any preexisting label with this name. It is an error
2604 if that label has already been defined in this function, or
2605 if there is a containing function with a declared label with
2607 tree label
= I_LABEL_DECL (name
);
2608 struct c_label_list
*nlist_se
, *nlist_vm
;
2611 && ((DECL_CONTEXT (label
) == current_function_decl
2612 && DECL_INITIAL (label
) != 0)
2613 || (DECL_CONTEXT (label
) != current_function_decl
2614 && C_DECLARED_LABEL_FLAG (label
))))
2616 error ("%Hduplicate label %qD", &location
, label
);
2617 locate_old_decl (label
, error
);
2620 else if (label
&& DECL_CONTEXT (label
) == current_function_decl
)
2622 /* The label has been used or declared already in this function,
2623 but not defined. Update its location to point to this
2625 if (C_DECL_UNDEFINABLE_STMT_EXPR (label
))
2626 error ("%Jjump into statement expression", label
);
2627 if (C_DECL_UNDEFINABLE_VM (label
))
2628 error ("%Jjump into scope of identifier with variably modified type",
2630 DECL_SOURCE_LOCATION (label
) = location
;
2634 /* No label binding for that identifier; make one. */
2635 label
= make_label (name
, location
);
2637 /* Ordinary labels go in the current function scope. */
2638 bind (name
, label
, current_function_scope
,
2639 /*invisible=*/false, /*nested=*/false);
2642 if (!in_system_header
&& lookup_name (name
))
2643 warning (OPT_Wtraditional
, "%Htraditional C lacks a separate namespace "
2644 "for labels, identifier %qE conflicts", &location
, name
);
2646 nlist_se
= XOBNEW (&parser_obstack
, struct c_label_list
);
2647 nlist_se
->next
= label_context_stack_se
->labels_def
;
2648 nlist_se
->label
= label
;
2649 label_context_stack_se
->labels_def
= nlist_se
;
2651 nlist_vm
= XOBNEW (&parser_obstack
, struct c_label_list
);
2652 nlist_vm
->next
= label_context_stack_vm
->labels_def
;
2653 nlist_vm
->label
= label
;
2654 label_context_stack_vm
->labels_def
= nlist_vm
;
2656 /* Mark label as having been defined. */
2657 DECL_INITIAL (label
) = error_mark_node
;
2661 /* Given NAME, an IDENTIFIER_NODE,
2662 return the structure (or union or enum) definition for that name.
2663 If THISLEVEL_ONLY is nonzero, searches only the current_scope.
2664 CODE says which kind of type the caller wants;
2665 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2666 If the wrong kind of type is found, an error is reported. */
2669 lookup_tag (enum tree_code code
, tree name
, int thislevel_only
)
2671 struct c_binding
*b
= I_TAG_BINDING (name
);
2677 /* We only care about whether it's in this level if
2678 thislevel_only was set or it might be a type clash. */
2679 if (thislevel_only
|| TREE_CODE (b
->decl
) != code
)
2681 /* For our purposes, a tag in the external scope is the same as
2682 a tag in the file scope. (Primarily relevant to Objective-C
2683 and its builtin structure tags, which get pushed before the
2684 file scope is created.) */
2685 if (B_IN_CURRENT_SCOPE (b
)
2686 || (current_scope
== file_scope
&& B_IN_EXTERNAL_SCOPE (b
)))
2690 if (thislevel_only
&& !thislevel
)
2693 if (TREE_CODE (b
->decl
) != code
)
2695 /* Definition isn't the kind we were looking for. */
2696 pending_invalid_xref
= name
;
2697 pending_invalid_xref_location
= input_location
;
2699 /* If in the same binding level as a declaration as a tag
2700 of a different type, this must not be allowed to
2701 shadow that tag, so give the error immediately.
2702 (For example, "struct foo; union foo;" is invalid.) */
2704 pending_xref_error ();
2709 /* Print an error message now
2710 for a recent invalid struct, union or enum cross reference.
2711 We don't print them immediately because they are not invalid
2712 when used in the `struct foo;' construct for shadowing. */
2715 pending_xref_error (void)
2717 if (pending_invalid_xref
!= 0)
2718 error ("%H%qE defined as wrong kind of tag",
2719 &pending_invalid_xref_location
, pending_invalid_xref
);
2720 pending_invalid_xref
= 0;
2724 /* Look up NAME in the current scope and its superiors
2725 in the namespace of variables, functions and typedefs.
2726 Return a ..._DECL node of some kind representing its definition,
2727 or return 0 if it is undefined. */
2730 lookup_name (tree name
)
2732 struct c_binding
*b
= I_SYMBOL_BINDING (name
);
2733 if (b
&& !b
->invisible
)
2738 /* Similar to `lookup_name' but look only at the indicated scope. */
2741 lookup_name_in_scope (tree name
, struct c_scope
*scope
)
2743 struct c_binding
*b
;
2745 for (b
= I_SYMBOL_BINDING (name
); b
; b
= b
->shadowed
)
2746 if (B_IN_SCOPE (b
, scope
))
2751 /* Create the predefined scalar types of C,
2752 and some nodes representing standard constants (0, 1, (void *) 0).
2753 Initialize the global scope.
2754 Make definitions for built-in primitive functions. */
2757 c_init_decl_processing (void)
2759 location_t save_loc
= input_location
;
2761 /* Initialize reserved words for parser. */
2764 current_function_decl
= 0;
2766 gcc_obstack_init (&parser_obstack
);
2768 /* Make the externals scope. */
2770 external_scope
= current_scope
;
2772 /* Declarations from c_common_nodes_and_builtins must not be associated
2773 with this input file, lest we get differences between using and not
2774 using preprocessed headers. */
2775 #ifdef USE_MAPPED_LOCATION
2776 input_location
= BUILTINS_LOCATION
;
2778 input_location
.file
= "<built-in>";
2779 input_location
.line
= 0;
2782 build_common_tree_nodes (flag_signed_char
, false);
2784 c_common_nodes_and_builtins ();
2786 /* In C, comparisons and TRUTH_* expressions have type int. */
2787 truthvalue_type_node
= integer_type_node
;
2788 truthvalue_true_node
= integer_one_node
;
2789 truthvalue_false_node
= integer_zero_node
;
2791 /* Even in C99, which has a real boolean type. */
2792 pushdecl (build_decl (TYPE_DECL
, get_identifier ("_Bool"),
2793 boolean_type_node
));
2795 input_location
= save_loc
;
2797 pedantic_lvalues
= true;
2799 make_fname_decl
= c_make_fname_decl
;
2800 start_fname_decls ();
2803 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
2804 decl, NAME is the initialization string and TYPE_DEP indicates whether
2805 NAME depended on the type of the function. As we don't yet implement
2806 delayed emission of static data, we mark the decl as emitted
2807 so it is not placed in the output. Anything using it must therefore pull
2808 out the STRING_CST initializer directly. FIXME. */
2811 c_make_fname_decl (tree id
, int type_dep
)
2813 const char *name
= fname_as_string (type_dep
);
2814 tree decl
, type
, init
;
2815 size_t length
= strlen (name
);
2817 type
= build_array_type (char_type_node
,
2818 build_index_type (size_int (length
)));
2819 type
= c_build_qualified_type (type
, TYPE_QUAL_CONST
);
2821 decl
= build_decl (VAR_DECL
, id
, type
);
2823 TREE_STATIC (decl
) = 1;
2824 TREE_READONLY (decl
) = 1;
2825 DECL_ARTIFICIAL (decl
) = 1;
2827 init
= build_string (length
+ 1, name
);
2828 free ((char *) name
);
2829 TREE_TYPE (init
) = type
;
2830 DECL_INITIAL (decl
) = init
;
2832 TREE_USED (decl
) = 1;
2834 if (current_function_decl
2835 /* For invalid programs like this:
2838 const char* p = __FUNCTION__;
2840 the __FUNCTION__ is believed to appear in K&R style function
2841 parameter declarator. In that case we still don't have
2843 && (!errorcount
|| current_function_scope
))
2845 DECL_CONTEXT (decl
) = current_function_decl
;
2846 bind (id
, decl
, current_function_scope
,
2847 /*invisible=*/false, /*nested=*/false);
2850 finish_decl (decl
, init
, NULL_TREE
);
2856 c_builtin_function (tree decl
)
2858 tree type
= TREE_TYPE (decl
);
2859 tree id
= DECL_NAME (decl
);
2861 const char *name
= IDENTIFIER_POINTER (id
);
2862 DECL_LANG_SPECIFIC (decl
) = GGC_CNEW (struct lang_decl
);
2863 C_DECL_BUILTIN_PROTOTYPE (decl
) = (TYPE_ARG_TYPES (type
) != 0);
2865 /* Should never be called on a symbol with a preexisting meaning. */
2866 gcc_assert (!I_SYMBOL_BINDING (id
));
2868 bind (id
, decl
, external_scope
, /*invisible=*/true, /*nested=*/false);
2870 /* Builtins in the implementation namespace are made visible without
2871 needing to be explicitly declared. See push_file_scope. */
2872 if (name
[0] == '_' && (name
[1] == '_' || ISUPPER (name
[1])))
2874 TREE_CHAIN (decl
) = visible_builtins
;
2875 visible_builtins
= decl
;
2881 /* Called when a declaration is seen that contains no names to declare.
2882 If its type is a reference to a structure, union or enum inherited
2883 from a containing scope, shadow that tag name for the current scope
2884 with a forward reference.
2885 If its type defines a new named structure or union
2886 or defines an enum, it is valid but we need not do anything here.
2887 Otherwise, it is an error. */
2890 shadow_tag (const struct c_declspecs
*declspecs
)
2892 shadow_tag_warned (declspecs
, 0);
2895 /* WARNED is 1 if we have done a pedwarn, 2 if we have done a warning,
2898 shadow_tag_warned (const struct c_declspecs
*declspecs
, int warned
)
2900 bool found_tag
= false;
2902 if (declspecs
->type
&& !declspecs
->default_int_p
&& !declspecs
->typedef_p
)
2904 tree value
= declspecs
->type
;
2905 enum tree_code code
= TREE_CODE (value
);
2907 if (code
== RECORD_TYPE
|| code
== UNION_TYPE
|| code
== ENUMERAL_TYPE
)
2908 /* Used to test also that TYPE_SIZE (value) != 0.
2909 That caused warning for `struct foo;' at top level in the file. */
2911 tree name
= TYPE_NAME (value
);
2918 if (warned
!= 1 && code
!= ENUMERAL_TYPE
)
2919 /* Empty unnamed enum OK */
2921 pedwarn ("unnamed struct/union that defines no instances");
2925 else if (!declspecs
->tag_defined_p
2926 && declspecs
->storage_class
!= csc_none
)
2929 pedwarn ("empty declaration with storage class specifier "
2930 "does not redeclare tag");
2932 pending_xref_error ();
2934 else if (!declspecs
->tag_defined_p
2935 && (declspecs
->const_p
2936 || declspecs
->volatile_p
2937 || declspecs
->restrict_p
))
2940 pedwarn ("empty declaration with type qualifier "
2941 "does not redeclare tag");
2943 pending_xref_error ();
2947 pending_invalid_xref
= 0;
2948 t
= lookup_tag (code
, name
, 1);
2952 t
= make_node (code
);
2959 if (warned
!= 1 && !in_system_header
)
2961 pedwarn ("useless type name in empty declaration");
2966 else if (warned
!= 1 && !in_system_header
&& declspecs
->typedef_p
)
2968 pedwarn ("useless type name in empty declaration");
2972 pending_invalid_xref
= 0;
2974 if (declspecs
->inline_p
)
2976 error ("%<inline%> in empty declaration");
2980 if (current_scope
== file_scope
&& declspecs
->storage_class
== csc_auto
)
2982 error ("%<auto%> in file-scope empty declaration");
2986 if (current_scope
== file_scope
&& declspecs
->storage_class
== csc_register
)
2988 error ("%<register%> in file-scope empty declaration");
2992 if (!warned
&& !in_system_header
&& declspecs
->storage_class
!= csc_none
)
2994 warning (0, "useless storage class specifier in empty declaration");
2998 if (!warned
&& !in_system_header
&& declspecs
->thread_p
)
3000 warning (0, "useless %<__thread%> in empty declaration");
3004 if (!warned
&& !in_system_header
&& (declspecs
->const_p
3005 || declspecs
->volatile_p
3006 || declspecs
->restrict_p
))
3008 warning (0, "useless type qualifier in empty declaration");
3015 pedwarn ("empty declaration");
3020 /* Return the qualifiers from SPECS as a bitwise OR of TYPE_QUAL_*
3021 bits. SPECS represents declaration specifiers that the grammar
3022 only permits to contain type qualifiers and attributes. */
3025 quals_from_declspecs (const struct c_declspecs
*specs
)
3027 int quals
= ((specs
->const_p
? TYPE_QUAL_CONST
: 0)
3028 | (specs
->volatile_p
? TYPE_QUAL_VOLATILE
: 0)
3029 | (specs
->restrict_p
? TYPE_QUAL_RESTRICT
: 0));
3030 gcc_assert (!specs
->type
3031 && !specs
->decl_attr
3032 && specs
->typespec_word
== cts_none
3033 && specs
->storage_class
== csc_none
3034 && !specs
->typedef_p
3035 && !specs
->explicit_signed_p
3036 && !specs
->deprecated_p
3038 && !specs
->long_long_p
3041 && !specs
->unsigned_p
3042 && !specs
->complex_p
3044 && !specs
->thread_p
);
3048 /* Construct an array declarator. EXPR is the expression inside [],
3049 or NULL_TREE. QUALS are the type qualifiers inside the [] (to be
3050 applied to the pointer to which a parameter array is converted).
3051 STATIC_P is true if "static" is inside the [], false otherwise.
3052 VLA_UNSPEC_P is true if the array is [*], a VLA of unspecified
3053 length which is nevertheless a complete type, false otherwise. The
3054 field for the contained declarator is left to be filled in by
3055 set_array_declarator_inner. */
3057 struct c_declarator
*
3058 build_array_declarator (tree expr
, struct c_declspecs
*quals
, bool static_p
,
3061 struct c_declarator
*declarator
= XOBNEW (&parser_obstack
,
3062 struct c_declarator
);
3063 declarator
->kind
= cdk_array
;
3064 declarator
->declarator
= 0;
3065 declarator
->u
.array
.dimen
= expr
;
3068 declarator
->u
.array
.attrs
= quals
->attrs
;
3069 declarator
->u
.array
.quals
= quals_from_declspecs (quals
);
3073 declarator
->u
.array
.attrs
= NULL_TREE
;
3074 declarator
->u
.array
.quals
= 0;
3076 declarator
->u
.array
.static_p
= static_p
;
3077 declarator
->u
.array
.vla_unspec_p
= vla_unspec_p
;
3078 if (pedantic
&& !flag_isoc99
)
3080 if (static_p
|| quals
!= NULL
)
3081 pedwarn ("ISO C90 does not support %<static%> or type "
3082 "qualifiers in parameter array declarators");
3084 pedwarn ("ISO C90 does not support %<[*]%> array declarators");
3088 if (!current_scope
->parm_flag
)
3091 error ("%<[*]%> not allowed in other than function prototype scope");
3092 declarator
->u
.array
.vla_unspec_p
= false;
3095 current_scope
->had_vla_unspec
= true;
3100 /* Set the contained declarator of an array declarator. DECL is the
3101 declarator, as constructed by build_array_declarator; INNER is what
3102 appears on the left of the []. ABSTRACT_P is true if it is an
3103 abstract declarator, false otherwise; this is used to reject static
3104 and type qualifiers in abstract declarators, where they are not in
3105 the C99 grammar (subject to possible change in DR#289). */
3107 struct c_declarator
*
3108 set_array_declarator_inner (struct c_declarator
*decl
,
3109 struct c_declarator
*inner
, bool abstract_p
)
3111 decl
->declarator
= inner
;
3112 if (abstract_p
&& (decl
->u
.array
.quals
!= TYPE_UNQUALIFIED
3113 || decl
->u
.array
.attrs
!= NULL_TREE
3114 || decl
->u
.array
.static_p
))
3115 error ("static or type qualifiers in abstract declarator");
3119 /* INIT is a constructor that forms DECL's initializer. If the final
3120 element initializes a flexible array field, add the size of that
3121 initializer to DECL's size. */
3124 add_flexible_array_elts_to_size (tree decl
, tree init
)
3128 if (VEC_empty (constructor_elt
, CONSTRUCTOR_ELTS (init
)))
3131 elt
= VEC_last (constructor_elt
, CONSTRUCTOR_ELTS (init
))->value
;
3132 type
= TREE_TYPE (elt
);
3133 if (TREE_CODE (type
) == ARRAY_TYPE
3134 && TYPE_SIZE (type
) == NULL_TREE
3135 && TYPE_DOMAIN (type
) != NULL_TREE
3136 && TYPE_MAX_VALUE (TYPE_DOMAIN (type
)) == NULL_TREE
)
3138 complete_array_type (&type
, elt
, false);
3140 = size_binop (PLUS_EXPR
, DECL_SIZE (decl
), TYPE_SIZE (type
));
3141 DECL_SIZE_UNIT (decl
)
3142 = size_binop (PLUS_EXPR
, DECL_SIZE_UNIT (decl
), TYPE_SIZE_UNIT (type
));
3146 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3149 groktypename (struct c_type_name
*type_name
)
3152 tree attrs
= type_name
->specs
->attrs
;
3154 type_name
->specs
->attrs
= NULL_TREE
;
3156 type
= grokdeclarator (type_name
->declarator
, type_name
->specs
, TYPENAME
,
3159 /* Apply attributes. */
3160 decl_attributes (&type
, attrs
, 0);
3165 /* Decode a declarator in an ordinary declaration or data definition.
3166 This is called as soon as the type information and variable name
3167 have been parsed, before parsing the initializer if any.
3168 Here we create the ..._DECL node, fill in its type,
3169 and put it on the list of decls for the current context.
3170 The ..._DECL node is returned as the value.
3172 Exception: for arrays where the length is not specified,
3173 the type is left null, to be filled in by `finish_decl'.
3175 Function definitions do not come here; they go to start_function
3176 instead. However, external and forward declarations of functions
3177 do go through here. Structure field declarations are done by
3178 grokfield and not through here. */
3181 start_decl (struct c_declarator
*declarator
, struct c_declspecs
*declspecs
,
3182 bool initialized
, tree attributes
)
3187 /* An object declared as __attribute__((deprecated)) suppresses
3188 warnings of uses of other deprecated items. */
3189 if (lookup_attribute ("deprecated", attributes
))
3190 deprecated_state
= DEPRECATED_SUPPRESS
;
3192 decl
= grokdeclarator (declarator
, declspecs
,
3193 NORMAL
, initialized
, NULL
);
3197 deprecated_state
= DEPRECATED_NORMAL
;
3199 if (warn_main
> 0 && TREE_CODE (decl
) != FUNCTION_DECL
3200 && MAIN_NAME_P (DECL_NAME (decl
)))
3201 warning (OPT_Wmain
, "%q+D is usually a function", decl
);
3204 /* Is it valid for this decl to have an initializer at all?
3205 If not, set INITIALIZED to zero, which will indirectly
3206 tell 'finish_decl' to ignore the initializer once it is parsed. */
3207 switch (TREE_CODE (decl
))
3210 error ("typedef %qD is initialized (use __typeof__ instead)", decl
);
3215 error ("function %qD is initialized like a variable", decl
);
3220 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3221 error ("parameter %qD is initialized", decl
);
3226 /* Don't allow initializations for incomplete types except for
3227 arrays which might be completed by the initialization. */
3229 /* This can happen if the array size is an undefined macro.
3230 We already gave a warning, so we don't need another one. */
3231 if (TREE_TYPE (decl
) == error_mark_node
)
3233 else if (COMPLETE_TYPE_P (TREE_TYPE (decl
)))
3235 /* A complete type is ok if size is fixed. */
3237 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl
))) != INTEGER_CST
3238 || C_DECL_VARIABLE_SIZE (decl
))
3240 error ("variable-sized object may not be initialized");
3244 else if (TREE_CODE (TREE_TYPE (decl
)) != ARRAY_TYPE
)
3246 error ("variable %qD has initializer but incomplete type", decl
);
3249 else if (C_DECL_VARIABLE_SIZE (decl
))
3251 /* Although C99 is unclear about whether incomplete arrays
3252 of VLAs themselves count as VLAs, it does not make
3253 sense to permit them to be initialized given that
3254 ordinary VLAs may not be initialized. */
3255 error ("variable-sized object may not be initialized");
3262 if (current_scope
== file_scope
)
3263 TREE_STATIC (decl
) = 1;
3265 /* Tell 'pushdecl' this is an initialized decl
3266 even though we don't yet have the initializer expression.
3267 Also tell 'finish_decl' it may store the real initializer. */
3268 DECL_INITIAL (decl
) = error_mark_node
;
3271 /* If this is a function declaration, write a record describing it to the
3272 prototypes file (if requested). */
3274 if (TREE_CODE (decl
) == FUNCTION_DECL
)
3275 gen_aux_info_record (decl
, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl
)) != 0);
3277 /* ANSI specifies that a tentative definition which is not merged with
3278 a non-tentative definition behaves exactly like a definition with an
3279 initializer equal to zero. (Section 3.7.2)
3281 -fno-common gives strict ANSI behavior, though this tends to break
3282 a large body of code that grew up without this rule.
3284 Thread-local variables are never common, since there's no entrenched
3285 body of code to break, and it allows more efficient variable references
3286 in the presence of dynamic linking. */
3288 if (TREE_CODE (decl
) == VAR_DECL
3290 && TREE_PUBLIC (decl
)
3291 && !DECL_THREAD_LOCAL_P (decl
)
3293 DECL_COMMON (decl
) = 1;
3295 /* Set attributes here so if duplicate decl, will have proper attributes. */
3296 decl_attributes (&decl
, attributes
, 0);
3298 /* Handle gnu_inline attribute. */
3299 if (declspecs
->inline_p
3300 && !flag_gnu89_inline
3301 && TREE_CODE (decl
) == FUNCTION_DECL
3302 && lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl
)))
3304 if (declspecs
->storage_class
== csc_auto
&& current_scope
!= file_scope
)
3306 else if (declspecs
->storage_class
!= csc_static
)
3307 DECL_EXTERNAL (decl
) = !DECL_EXTERNAL (decl
);
3310 if (TREE_CODE (decl
) == FUNCTION_DECL
3311 && targetm
.calls
.promote_prototypes (TREE_TYPE (decl
)))
3313 struct c_declarator
*ce
= declarator
;
3315 if (ce
->kind
== cdk_pointer
)
3316 ce
= declarator
->declarator
;
3317 if (ce
->kind
== cdk_function
)
3319 tree args
= ce
->u
.arg_info
->parms
;
3320 for (; args
; args
= TREE_CHAIN (args
))
3322 tree type
= TREE_TYPE (args
);
3323 if (type
&& INTEGRAL_TYPE_P (type
)
3324 && TYPE_PRECISION (type
) < TYPE_PRECISION (integer_type_node
))
3325 DECL_ARG_TYPE (args
) = integer_type_node
;
3330 if (TREE_CODE (decl
) == FUNCTION_DECL
3331 && DECL_DECLARED_INLINE_P (decl
)
3332 && DECL_UNINLINABLE (decl
)
3333 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl
)))
3334 warning (OPT_Wattributes
, "inline function %q+D given attribute noinline",
3337 /* C99 6.7.4p3: An inline definition of a function with external
3338 linkage shall not contain a definition of a modifiable object
3339 with static storage duration... */
3340 if (TREE_CODE (decl
) == VAR_DECL
3341 && current_scope
!= file_scope
3342 && TREE_STATIC (decl
)
3343 && DECL_DECLARED_INLINE_P (current_function_decl
)
3344 && DECL_EXTERNAL (current_function_decl
))
3345 pedwarn ("%q+D is static but declared in inline function %qD "
3346 "which is not static", decl
, current_function_decl
);
3348 /* Add this decl to the current scope.
3349 TEM may equal DECL or it may be a previous decl of the same name. */
3350 tem
= pushdecl (decl
);
3352 if (initialized
&& DECL_EXTERNAL (tem
))
3354 DECL_EXTERNAL (tem
) = 0;
3355 TREE_STATIC (tem
) = 1;
3361 /* Initialize EH if not initialized yet and exceptions are enabled. */
3364 c_maybe_initialize_eh (void)
3366 if (!flag_exceptions
|| c_eh_initialized_p
)
3369 c_eh_initialized_p
= true;
3370 eh_personality_libfunc
3371 = init_one_libfunc (USING_SJLJ_EXCEPTIONS
3372 ? "__gcc_personality_sj0"
3373 : "__gcc_personality_v0");
3374 default_init_unwind_resume_libfunc ();
3375 using_eh_for_cleanups ();
3378 /* Finish processing of a declaration;
3379 install its initial value.
3380 If the length of an array type is not known before,
3381 it must be determined now, from the initial value, or it is an error. */
3384 finish_decl (tree decl
, tree init
, tree asmspec_tree
)
3387 int was_incomplete
= (DECL_SIZE (decl
) == 0);
3388 const char *asmspec
= 0;
3390 /* If a name was specified, get the string. */
3391 if ((TREE_CODE (decl
) == FUNCTION_DECL
|| TREE_CODE (decl
) == VAR_DECL
)
3392 && DECL_FILE_SCOPE_P (decl
))
3393 asmspec_tree
= maybe_apply_renaming_pragma (decl
, asmspec_tree
);
3395 asmspec
= TREE_STRING_POINTER (asmspec_tree
);
3397 /* If `start_decl' didn't like having an initialization, ignore it now. */
3398 if (init
!= 0 && DECL_INITIAL (decl
) == 0)
3401 /* Don't crash if parm is initialized. */
3402 if (TREE_CODE (decl
) == PARM_DECL
)
3406 store_init_value (decl
, init
);
3408 if (c_dialect_objc () && (TREE_CODE (decl
) == VAR_DECL
3409 || TREE_CODE (decl
) == FUNCTION_DECL
3410 || TREE_CODE (decl
) == FIELD_DECL
))
3411 objc_check_decl (decl
);
3413 type
= TREE_TYPE (decl
);
3415 /* Deduce size of array from initialization, if not already known. */
3416 if (TREE_CODE (type
) == ARRAY_TYPE
3417 && TYPE_DOMAIN (type
) == 0
3418 && TREE_CODE (decl
) != TYPE_DECL
)
3421 = (TREE_STATIC (decl
)
3422 /* Even if pedantic, an external linkage array
3423 may have incomplete type at first. */
3424 ? pedantic
&& !TREE_PUBLIC (decl
)
3425 : !DECL_EXTERNAL (decl
));
3427 = complete_array_type (&TREE_TYPE (decl
), DECL_INITIAL (decl
),
3430 /* Get the completed type made by complete_array_type. */
3431 type
= TREE_TYPE (decl
);
3436 error ("initializer fails to determine size of %q+D", decl
);
3441 error ("array size missing in %q+D", decl
);
3442 /* If a `static' var's size isn't known,
3443 make it extern as well as static, so it does not get
3445 If it is not `static', then do not mark extern;
3446 finish_incomplete_decl will give it a default size
3447 and it will get allocated. */
3448 else if (!pedantic
&& TREE_STATIC (decl
) && !TREE_PUBLIC (decl
))
3449 DECL_EXTERNAL (decl
) = 1;
3453 error ("zero or negative size array %q+D", decl
);
3457 /* For global variables, update the copy of the type that
3458 exists in the binding. */
3459 if (TREE_PUBLIC (decl
))
3461 struct c_binding
*b_ext
= I_SYMBOL_BINDING (DECL_NAME (decl
));
3462 while (b_ext
&& !B_IN_EXTERNAL_SCOPE (b_ext
))
3463 b_ext
= b_ext
->shadowed
;
3467 b_ext
->type
= composite_type (b_ext
->type
, type
);
3478 if (DECL_INITIAL (decl
))
3479 TREE_TYPE (DECL_INITIAL (decl
)) = type
;
3481 layout_decl (decl
, 0);
3484 if (TREE_CODE (decl
) == VAR_DECL
)
3486 if (init
&& TREE_CODE (init
) == CONSTRUCTOR
)
3487 add_flexible_array_elts_to_size (decl
, init
);
3489 if (DECL_SIZE (decl
) == 0 && TREE_TYPE (decl
) != error_mark_node
3490 && COMPLETE_TYPE_P (TREE_TYPE (decl
)))
3491 layout_decl (decl
, 0);
3493 if (DECL_SIZE (decl
) == 0
3494 /* Don't give an error if we already gave one earlier. */
3495 && TREE_TYPE (decl
) != error_mark_node
3496 && (TREE_STATIC (decl
)
3497 /* A static variable with an incomplete type
3498 is an error if it is initialized.
3499 Also if it is not file scope.
3500 Otherwise, let it through, but if it is not `extern'
3501 then it may cause an error message later. */
3502 ? (DECL_INITIAL (decl
) != 0
3503 || !DECL_FILE_SCOPE_P (decl
))
3504 /* An automatic variable with an incomplete type
3506 : !DECL_EXTERNAL (decl
)))
3508 error ("storage size of %q+D isn%'t known", decl
);
3509 TREE_TYPE (decl
) = error_mark_node
;
3512 if ((DECL_EXTERNAL (decl
) || TREE_STATIC (decl
))
3513 && DECL_SIZE (decl
) != 0)
3515 if (TREE_CODE (DECL_SIZE (decl
)) == INTEGER_CST
)
3516 constant_expression_warning (DECL_SIZE (decl
));
3518 error ("storage size of %q+D isn%'t constant", decl
);
3521 if (TREE_USED (type
))
3522 TREE_USED (decl
) = 1;
3525 /* If this is a function and an assembler name is specified, reset DECL_RTL
3526 so we can give it its new name. Also, update built_in_decls if it
3527 was a normal built-in. */
3528 if (TREE_CODE (decl
) == FUNCTION_DECL
&& asmspec
)
3530 if (DECL_BUILT_IN_CLASS (decl
) == BUILT_IN_NORMAL
)
3531 set_builtin_user_assembler_name (decl
, asmspec
);
3532 set_user_assembler_name (decl
, asmspec
);
3535 /* If #pragma weak was used, mark the decl weak now. */
3536 maybe_apply_pragma_weak (decl
);
3538 /* Output the assembler code and/or RTL code for variables and functions,
3539 unless the type is an undefined structure or union.
3540 If not, it will get done when the type is completed. */
3542 if (TREE_CODE (decl
) == VAR_DECL
|| TREE_CODE (decl
) == FUNCTION_DECL
)
3544 /* Determine the ELF visibility. */
3545 if (TREE_PUBLIC (decl
))
3546 c_determine_visibility (decl
);
3548 /* This is a no-op in c-lang.c or something real in objc-act.c. */
3549 if (c_dialect_objc ())
3550 objc_check_decl (decl
);
3554 /* If this is not a static variable, issue a warning.
3555 It doesn't make any sense to give an ASMSPEC for an
3556 ordinary, non-register local variable. Historically,
3557 GCC has accepted -- but ignored -- the ASMSPEC in
3559 if (!DECL_FILE_SCOPE_P (decl
)
3560 && TREE_CODE (decl
) == VAR_DECL
3561 && !C_DECL_REGISTER (decl
)
3562 && !TREE_STATIC (decl
))
3563 warning (0, "ignoring asm-specifier for non-static local "
3564 "variable %q+D", decl
);
3566 set_user_assembler_name (decl
, asmspec
);
3569 if (DECL_FILE_SCOPE_P (decl
))
3571 if (DECL_INITIAL (decl
) == NULL_TREE
3572 || DECL_INITIAL (decl
) == error_mark_node
)
3573 /* Don't output anything
3574 when a tentative file-scope definition is seen.
3575 But at end of compilation, do output code for them. */
3576 DECL_DEFER_OUTPUT (decl
) = 1;
3577 rest_of_decl_compilation (decl
, true, 0);
3581 /* In conjunction with an ASMSPEC, the `register'
3582 keyword indicates that we should place the variable
3583 in a particular register. */
3584 if (asmspec
&& C_DECL_REGISTER (decl
))
3586 DECL_HARD_REGISTER (decl
) = 1;
3587 /* This cannot be done for a structure with volatile
3588 fields, on which DECL_REGISTER will have been
3590 if (!DECL_REGISTER (decl
))
3591 error ("cannot put object with volatile field into register");
3594 if (TREE_CODE (decl
) != FUNCTION_DECL
)
3596 /* If we're building a variable sized type, and we might be
3597 reachable other than via the top of the current binding
3598 level, then create a new BIND_EXPR so that we deallocate
3599 the object at the right time. */
3600 /* Note that DECL_SIZE can be null due to errors. */
3601 if (DECL_SIZE (decl
)
3602 && !TREE_CONSTANT (DECL_SIZE (decl
))
3603 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list
))
3606 bind
= build3 (BIND_EXPR
, void_type_node
, NULL
, NULL
, NULL
);
3607 TREE_SIDE_EFFECTS (bind
) = 1;
3609 BIND_EXPR_BODY (bind
) = push_stmt_list ();
3611 add_stmt (build_stmt (DECL_EXPR
, decl
));
3616 if (!DECL_FILE_SCOPE_P (decl
))
3618 /* Recompute the RTL of a local array now
3619 if it used to be an incomplete type. */
3621 && !TREE_STATIC (decl
) && !DECL_EXTERNAL (decl
))
3623 /* If we used it already as memory, it must stay in memory. */
3624 TREE_ADDRESSABLE (decl
) = TREE_USED (decl
);
3625 /* If it's still incomplete now, no init will save it. */
3626 if (DECL_SIZE (decl
) == 0)
3627 DECL_INITIAL (decl
) = 0;
3632 /* If this was marked 'used', be sure it will be output. */
3633 if (!flag_unit_at_a_time
&& lookup_attribute ("used", DECL_ATTRIBUTES (decl
)))
3634 mark_decl_referenced (decl
);
3636 if (TREE_CODE (decl
) == TYPE_DECL
)
3638 if (!DECL_FILE_SCOPE_P (decl
)
3639 && variably_modified_type_p (TREE_TYPE (decl
), NULL_TREE
))
3640 add_stmt (build_stmt (DECL_EXPR
, decl
));
3642 rest_of_decl_compilation (decl
, DECL_FILE_SCOPE_P (decl
), 0);
3645 /* At the end of a declaration, throw away any variable type sizes
3646 of types defined inside that declaration. There is no use
3647 computing them in the following function definition. */
3648 if (current_scope
== file_scope
)
3649 get_pending_sizes ();
3651 /* Install a cleanup (aka destructor) if one was given. */
3652 if (TREE_CODE (decl
) == VAR_DECL
&& !TREE_STATIC (decl
))
3654 tree attr
= lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl
));
3657 tree cleanup_id
= TREE_VALUE (TREE_VALUE (attr
));
3658 tree cleanup_decl
= lookup_name (cleanup_id
);
3661 /* Build "cleanup(&decl)" for the destructor. */
3662 cleanup
= build_unary_op (ADDR_EXPR
, decl
, 0);
3663 cleanup
= build_tree_list (NULL_TREE
, cleanup
);
3664 cleanup
= build_function_call (cleanup_decl
, cleanup
);
3666 /* Don't warn about decl unused; the cleanup uses it. */
3667 TREE_USED (decl
) = 1;
3668 TREE_USED (cleanup_decl
) = 1;
3670 /* Initialize EH, if we've been told to do so. */
3671 c_maybe_initialize_eh ();
3673 push_cleanup (decl
, cleanup
, false);
3678 /* Given a parsed parameter declaration, decode it into a PARM_DECL. */
3681 grokparm (const struct c_parm
*parm
)
3683 tree decl
= grokdeclarator (parm
->declarator
, parm
->specs
, PARM
, false,
3686 decl_attributes (&decl
, parm
->attrs
, 0);
3691 /* Given a parsed parameter declaration, decode it into a PARM_DECL
3692 and push that on the current scope. */
3695 push_parm_decl (const struct c_parm
*parm
)
3699 decl
= grokdeclarator (parm
->declarator
, parm
->specs
, PARM
, false, NULL
);
3700 decl_attributes (&decl
, parm
->attrs
, 0);
3702 decl
= pushdecl (decl
);
3704 finish_decl (decl
, NULL_TREE
, NULL_TREE
);
3707 /* Mark all the parameter declarations to date as forward decls.
3708 Also diagnose use of this extension. */
3711 mark_forward_parm_decls (void)
3713 struct c_binding
*b
;
3715 if (pedantic
&& !current_scope
->warned_forward_parm_decls
)
3717 pedwarn ("ISO C forbids forward parameter declarations");
3718 current_scope
->warned_forward_parm_decls
= true;
3721 for (b
= current_scope
->bindings
; b
; b
= b
->prev
)
3722 if (TREE_CODE (b
->decl
) == PARM_DECL
)
3723 TREE_ASM_WRITTEN (b
->decl
) = 1;
3726 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
3727 literal, which may be an incomplete array type completed by the
3728 initializer; INIT is a CONSTRUCTOR that initializes the compound
3732 build_compound_literal (tree type
, tree init
)
3734 /* We do not use start_decl here because we have a type, not a declarator;
3735 and do not use finish_decl because the decl should be stored inside
3736 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_EXPR. */
3741 if (type
== error_mark_node
)
3742 return error_mark_node
;
3744 decl
= build_decl (VAR_DECL
, NULL_TREE
, type
);
3745 DECL_EXTERNAL (decl
) = 0;
3746 TREE_PUBLIC (decl
) = 0;
3747 TREE_STATIC (decl
) = (current_scope
== file_scope
);
3748 DECL_CONTEXT (decl
) = current_function_decl
;
3749 TREE_USED (decl
) = 1;
3750 TREE_TYPE (decl
) = type
;
3751 TREE_READONLY (decl
) = TYPE_READONLY (type
);
3752 store_init_value (decl
, init
);
3754 if (TREE_CODE (type
) == ARRAY_TYPE
&& !COMPLETE_TYPE_P (type
))
3756 int failure
= complete_array_type (&TREE_TYPE (decl
),
3757 DECL_INITIAL (decl
), true);
3758 gcc_assert (!failure
);
3760 type
= TREE_TYPE (decl
);
3761 TREE_TYPE (DECL_INITIAL (decl
)) = type
;
3764 if (type
== error_mark_node
|| !COMPLETE_TYPE_P (type
))
3765 return error_mark_node
;
3767 stmt
= build_stmt (DECL_EXPR
, decl
);
3768 complit
= build1 (COMPOUND_LITERAL_EXPR
, type
, stmt
);
3769 TREE_SIDE_EFFECTS (complit
) = 1;
3771 layout_decl (decl
, 0);
3773 if (TREE_STATIC (decl
))
3775 /* This decl needs a name for the assembler output. */
3776 set_compound_literal_name (decl
);
3777 DECL_DEFER_OUTPUT (decl
) = 1;
3778 DECL_COMDAT (decl
) = 1;
3779 DECL_ARTIFICIAL (decl
) = 1;
3780 DECL_IGNORED_P (decl
) = 1;
3782 rest_of_decl_compilation (decl
, 1, 0);
3788 /* Determine whether TYPE is a structure with a flexible array member,
3789 or a union containing such a structure (possibly recursively). */
3792 flexible_array_type_p (tree type
)
3795 switch (TREE_CODE (type
))
3798 x
= TYPE_FIELDS (type
);
3801 while (TREE_CHAIN (x
) != NULL_TREE
)
3803 if (TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
3804 && TYPE_SIZE (TREE_TYPE (x
)) == NULL_TREE
3805 && TYPE_DOMAIN (TREE_TYPE (x
)) != NULL_TREE
3806 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x
))) == NULL_TREE
)
3810 for (x
= TYPE_FIELDS (type
); x
!= NULL_TREE
; x
= TREE_CHAIN (x
))
3812 if (flexible_array_type_p (TREE_TYPE (x
)))
3821 /* Performs sanity checks on the TYPE and WIDTH of the bit-field NAME,
3822 replacing with appropriate values if they are invalid. */
3824 check_bitfield_type_and_width (tree
*type
, tree
*width
, const char *orig_name
)
3827 unsigned int max_width
;
3828 unsigned HOST_WIDE_INT w
;
3829 const char *name
= orig_name
? orig_name
: _("<anonymous>");
3831 /* Detect and ignore out of range field width and process valid
3833 if (!INTEGRAL_TYPE_P (TREE_TYPE (*width
))
3834 || TREE_CODE (*width
) != INTEGER_CST
)
3836 error ("bit-field %qs width not an integer constant", name
);
3837 *width
= integer_one_node
;
3841 constant_expression_warning (*width
);
3842 if (tree_int_cst_sgn (*width
) < 0)
3844 error ("negative width in bit-field %qs", name
);
3845 *width
= integer_one_node
;
3847 else if (integer_zerop (*width
) && orig_name
)
3849 error ("zero width for bit-field %qs", name
);
3850 *width
= integer_one_node
;
3854 /* Detect invalid bit-field type. */
3855 if (TREE_CODE (*type
) != INTEGER_TYPE
3856 && TREE_CODE (*type
) != BOOLEAN_TYPE
3857 && TREE_CODE (*type
) != ENUMERAL_TYPE
)
3859 error ("bit-field %qs has invalid type", name
);
3860 *type
= unsigned_type_node
;
3863 type_mv
= TYPE_MAIN_VARIANT (*type
);
3865 && !in_system_header
3866 && type_mv
!= integer_type_node
3867 && type_mv
!= unsigned_type_node
3868 && type_mv
!= boolean_type_node
)
3869 pedwarn ("type of bit-field %qs is a GCC extension", name
);
3871 if (type_mv
== boolean_type_node
)
3872 max_width
= CHAR_TYPE_SIZE
;
3874 max_width
= TYPE_PRECISION (*type
);
3876 if (0 < compare_tree_int (*width
, max_width
))
3878 error ("width of %qs exceeds its type", name
);
3880 *width
= build_int_cst (NULL_TREE
, w
);
3883 w
= tree_low_cst (*width
, 1);
3885 if (TREE_CODE (*type
) == ENUMERAL_TYPE
)
3887 struct lang_type
*lt
= TYPE_LANG_SPECIFIC (*type
);
3889 || w
< min_precision (lt
->enum_min
, TYPE_UNSIGNED (*type
))
3890 || w
< min_precision (lt
->enum_max
, TYPE_UNSIGNED (*type
)))
3891 warning (0, "%qs is narrower than values of its type", name
);
3897 /* Print warning about variable length array if necessary. */
3900 warn_variable_length_array (const char *name
, tree size
)
3902 int ped
= !flag_isoc99
&& pedantic
&& warn_vla
!= 0;
3903 int const_size
= TREE_CONSTANT (size
);
3910 pedwarn ("ISO C90 forbids array %qs whose size "
3911 "can%'t be evaluated",
3914 pedwarn ("ISO C90 forbids array whose size "
3915 "can%'t be evaluated");
3920 pedwarn ("ISO C90 forbids variable length array %qs",
3923 pedwarn ("ISO C90 forbids variable length array");
3926 else if (warn_vla
> 0)
3932 "the size of array %qs can"
3933 "%'t be evaluated", name
);
3936 "the size of array can %'t be evaluated");
3942 "variable length array %qs is used",
3946 "variable length array is used");
3951 /* Given declspecs and a declarator,
3952 determine the name and type of the object declared
3953 and construct a ..._DECL node for it.
3954 (In one case we can return a ..._TYPE node instead.
3955 For invalid input we sometimes return 0.)
3957 DECLSPECS is a c_declspecs structure for the declaration specifiers.
3959 DECL_CONTEXT says which syntactic context this declaration is in:
3960 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3961 FUNCDEF for a function definition. Like NORMAL but a few different
3962 error messages in each case. Return value may be zero meaning
3963 this definition is too screwy to try to parse.
3964 PARM for a parameter declaration (either within a function prototype
3965 or before a function body). Make a PARM_DECL, or return void_type_node.
3966 TYPENAME if for a typename (in a cast or sizeof).
3967 Don't make a DECL node; just return the ..._TYPE node.
3968 FIELD for a struct or union field; make a FIELD_DECL.
3969 INITIALIZED is true if the decl has an initializer.
3970 WIDTH is non-NULL for bit-fields, and is a pointer to an INTEGER_CST node
3971 representing the width of the bit-field.
3973 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3974 It may also be so in the PARM case, for a prototype where the
3975 argument type is specified but not the name.
3977 This function is where the complicated C meanings of `static'
3978 and `extern' are interpreted. */
3981 grokdeclarator (const struct c_declarator
*declarator
,
3982 struct c_declspecs
*declspecs
,
3983 enum decl_context decl_context
, bool initialized
, tree
*width
)
3985 tree type
= declspecs
->type
;
3986 bool threadp
= declspecs
->thread_p
;
3987 enum c_storage_class storage_class
= declspecs
->storage_class
;
3991 int type_quals
= TYPE_UNQUALIFIED
;
3992 const char *name
, *orig_name
;
3993 tree typedef_type
= 0;
3994 bool funcdef_flag
= false;
3995 bool funcdef_syntax
= false;
3996 int size_varies
= 0;
3997 tree decl_attr
= declspecs
->decl_attr
;
3998 int array_ptr_quals
= TYPE_UNQUALIFIED
;
3999 tree array_ptr_attrs
= NULL_TREE
;
4000 int array_parm_static
= 0;
4001 bool array_parm_vla_unspec_p
= false;
4002 tree returned_attrs
= NULL_TREE
;
4003 bool bitfield
= width
!= NULL
;
4005 struct c_arg_info
*arg_info
= 0;
4007 if (decl_context
== FUNCDEF
)
4008 funcdef_flag
= true, decl_context
= NORMAL
;
4010 /* Look inside a declarator for the name being declared
4011 and get it as a string, for an error message. */
4013 const struct c_declarator
*decl
= declarator
;
4022 funcdef_syntax
= (decl
->kind
== cdk_function
);
4023 decl
= decl
->declarator
;
4027 decl
= decl
->declarator
;
4032 name
= IDENTIFIER_POINTER (decl
->u
.id
);
4044 /* A function definition's declarator must have the form of
4045 a function declarator. */
4047 if (funcdef_flag
&& !funcdef_syntax
)
4050 /* If this looks like a function definition, make it one,
4051 even if it occurs where parms are expected.
4052 Then store_parm_decls will reject it and not use it as a parm. */
4053 if (decl_context
== NORMAL
&& !funcdef_flag
&& current_scope
->parm_flag
)
4054 decl_context
= PARM
;
4056 if (declspecs
->deprecated_p
&& deprecated_state
!= DEPRECATED_SUPPRESS
)
4057 warn_deprecated_use (declspecs
->type
);
4059 if ((decl_context
== NORMAL
|| decl_context
== FIELD
)
4060 && current_scope
== file_scope
4061 && variably_modified_type_p (type
, NULL_TREE
))
4063 error ("variably modified %qs at file scope", name
);
4064 type
= integer_type_node
;
4067 typedef_type
= type
;
4068 size_varies
= C_TYPE_VARIABLE_SIZE (type
);
4070 /* Diagnose defaulting to "int". */
4072 if (declspecs
->default_int_p
&& !in_system_header
)
4074 /* Issue a warning if this is an ISO C 99 program or if
4075 -Wreturn-type and this is a function, or if -Wimplicit;
4076 prefer the former warning since it is more explicit. */
4077 if ((warn_implicit_int
|| warn_return_type
|| flag_isoc99
)
4079 warn_about_return_type
= 1;
4080 else if (warn_implicit_int
|| flag_isoc99
)
4081 pedwarn_c99 ("type defaults to %<int%> in declaration of %qs", name
);
4084 /* Adjust the type if a bit-field is being declared,
4085 -funsigned-bitfields applied and the type is not explicitly
4087 if (bitfield
&& !flag_signed_bitfields
&& !declspecs
->explicit_signed_p
4088 && TREE_CODE (type
) == INTEGER_TYPE
)
4089 type
= c_common_unsigned_type (type
);
4091 /* Figure out the type qualifiers for the declaration. There are
4092 two ways a declaration can become qualified. One is something
4093 like `const int i' where the `const' is explicit. Another is
4094 something like `typedef const int CI; CI i' where the type of the
4095 declaration contains the `const'. A third possibility is that
4096 there is a type qualifier on the element type of a typedefed
4097 array type, in which case we should extract that qualifier so
4098 that c_apply_type_quals_to_decls receives the full list of
4099 qualifiers to work with (C90 is not entirely clear about whether
4100 duplicate qualifiers should be diagnosed in this case, but it
4101 seems most appropriate to do so). */
4102 element_type
= strip_array_types (type
);
4103 constp
= declspecs
->const_p
+ TYPE_READONLY (element_type
);
4104 restrictp
= declspecs
->restrict_p
+ TYPE_RESTRICT (element_type
);
4105 volatilep
= declspecs
->volatile_p
+ TYPE_VOLATILE (element_type
);
4106 if (pedantic
&& !flag_isoc99
)
4109 pedwarn ("duplicate %<const%>");
4111 pedwarn ("duplicate %<restrict%>");
4113 pedwarn ("duplicate %<volatile%>");
4115 if (!flag_gen_aux_info
&& (TYPE_QUALS (element_type
)))
4116 type
= TYPE_MAIN_VARIANT (type
);
4117 type_quals
= ((constp
? TYPE_QUAL_CONST
: 0)
4118 | (restrictp
? TYPE_QUAL_RESTRICT
: 0)
4119 | (volatilep
? TYPE_QUAL_VOLATILE
: 0));
4121 /* Warn about storage classes that are invalid for certain
4122 kinds of declarations (parameters, typenames, etc.). */
4126 || storage_class
== csc_auto
4127 || storage_class
== csc_register
4128 || storage_class
== csc_typedef
))
4130 if (storage_class
== csc_auto
4131 && (pedantic
|| current_scope
== file_scope
))
4132 pedwarn ("function definition declared %<auto%>");
4133 if (storage_class
== csc_register
)
4134 error ("function definition declared %<register%>");
4135 if (storage_class
== csc_typedef
)
4136 error ("function definition declared %<typedef%>");
4138 error ("function definition declared %<__thread%>");
4140 if (storage_class
== csc_auto
4141 || storage_class
== csc_register
4142 || storage_class
== csc_typedef
)
4143 storage_class
= csc_none
;
4145 else if (decl_context
!= NORMAL
&& (storage_class
!= csc_none
|| threadp
))
4147 if (decl_context
== PARM
&& storage_class
== csc_register
)
4151 switch (decl_context
)
4154 error ("storage class specified for structure field %qs",
4158 error ("storage class specified for parameter %qs", name
);
4161 error ("storage class specified for typename");
4164 storage_class
= csc_none
;
4168 else if (storage_class
== csc_extern
4172 /* 'extern' with initialization is invalid if not at file scope. */
4173 if (current_scope
== file_scope
)
4175 /* It is fine to have 'extern const' when compiling at C
4176 and C++ intersection. */
4177 if (!(warn_cxx_compat
&& constp
))
4178 warning (0, "%qs initialized and declared %<extern%>", name
);
4181 error ("%qs has both %<extern%> and initializer", name
);
4183 else if (current_scope
== file_scope
)
4185 if (storage_class
== csc_auto
)
4186 error ("file-scope declaration of %qs specifies %<auto%>", name
);
4187 if (pedantic
&& storage_class
== csc_register
)
4188 pedwarn ("file-scope declaration of %qs specifies %<register%>", name
);
4192 if (storage_class
== csc_extern
&& funcdef_flag
)
4193 error ("nested function %qs declared %<extern%>", name
);
4194 else if (threadp
&& storage_class
== csc_none
)
4196 error ("function-scope %qs implicitly auto and declared "
4203 /* Now figure out the structure of the declarator proper.
4204 Descend through it, creating more complex types, until we reach
4205 the declared identifier (or NULL_TREE, in an absolute declarator).
4206 At each stage we maintain an unqualified version of the type
4207 together with any qualifiers that should be applied to it with
4208 c_build_qualified_type; this way, array types including
4209 multidimensional array types are first built up in unqualified
4210 form and then the qualified form is created with
4211 TYPE_MAIN_VARIANT pointing to the unqualified form. */
4213 while (declarator
&& declarator
->kind
!= cdk_id
)
4215 if (type
== error_mark_node
)
4217 declarator
= declarator
->declarator
;
4221 /* Each level of DECLARATOR is either a cdk_array (for ...[..]),
4222 a cdk_pointer (for *...),
4223 a cdk_function (for ...(...)),
4224 a cdk_attrs (for nested attributes),
4225 or a cdk_id (for the name being declared
4226 or the place in an absolute declarator
4227 where the name was omitted).
4228 For the last case, we have just exited the loop.
4230 At this point, TYPE is the type of elements of an array,
4231 or for a function to return, or for a pointer to point to.
4232 After this sequence of ifs, TYPE is the type of the
4233 array or function or pointer, and DECLARATOR has had its
4234 outermost layer removed. */
4236 if (array_ptr_quals
!= TYPE_UNQUALIFIED
4237 || array_ptr_attrs
!= NULL_TREE
4238 || array_parm_static
)
4240 /* Only the innermost declarator (making a parameter be of
4241 array type which is converted to pointer type)
4242 may have static or type qualifiers. */
4243 error ("static or type qualifiers in non-parameter array declarator");
4244 array_ptr_quals
= TYPE_UNQUALIFIED
;
4245 array_ptr_attrs
= NULL_TREE
;
4246 array_parm_static
= 0;
4249 switch (declarator
->kind
)
4253 /* A declarator with embedded attributes. */
4254 tree attrs
= declarator
->u
.attrs
;
4255 const struct c_declarator
*inner_decl
;
4257 declarator
= declarator
->declarator
;
4258 inner_decl
= declarator
;
4259 while (inner_decl
->kind
== cdk_attrs
)
4260 inner_decl
= inner_decl
->declarator
;
4261 if (inner_decl
->kind
== cdk_id
)
4262 attr_flags
|= (int) ATTR_FLAG_DECL_NEXT
;
4263 else if (inner_decl
->kind
== cdk_function
)
4264 attr_flags
|= (int) ATTR_FLAG_FUNCTION_NEXT
;
4265 else if (inner_decl
->kind
== cdk_array
)
4266 attr_flags
|= (int) ATTR_FLAG_ARRAY_NEXT
;
4267 returned_attrs
= decl_attributes (&type
,
4268 chainon (returned_attrs
, attrs
),
4274 tree itype
= NULL_TREE
;
4275 tree size
= declarator
->u
.array
.dimen
;
4276 /* The index is a signed object `sizetype' bits wide. */
4277 tree index_type
= c_common_signed_type (sizetype
);
4279 array_ptr_quals
= declarator
->u
.array
.quals
;
4280 array_ptr_attrs
= declarator
->u
.array
.attrs
;
4281 array_parm_static
= declarator
->u
.array
.static_p
;
4282 array_parm_vla_unspec_p
= declarator
->u
.array
.vla_unspec_p
;
4284 declarator
= declarator
->declarator
;
4286 /* Check for some types that there cannot be arrays of. */
4288 if (VOID_TYPE_P (type
))
4290 error ("declaration of %qs as array of voids", name
);
4291 type
= error_mark_node
;
4294 if (TREE_CODE (type
) == FUNCTION_TYPE
)
4296 error ("declaration of %qs as array of functions", name
);
4297 type
= error_mark_node
;
4300 if (pedantic
&& !in_system_header
&& flexible_array_type_p (type
))
4301 pedwarn ("invalid use of structure with flexible array member");
4303 if (size
== error_mark_node
)
4304 type
= error_mark_node
;
4306 if (type
== error_mark_node
)
4309 /* If size was specified, set ITYPE to a range-type for
4310 that size. Otherwise, ITYPE remains null. finish_decl
4311 may figure it out from an initial value. */
4315 /* Strip NON_LVALUE_EXPRs since we aren't using as an
4317 STRIP_TYPE_NOPS (size
);
4319 if (!INTEGRAL_TYPE_P (TREE_TYPE (size
)))
4321 error ("size of array %qs has non-integer type", name
);
4322 size
= integer_one_node
;
4325 if (pedantic
&& integer_zerop (size
))
4326 pedwarn ("ISO C forbids zero-size array %qs", name
);
4328 if (TREE_CODE (size
) == INTEGER_CST
)
4330 constant_expression_warning (size
);
4331 if (tree_int_cst_sgn (size
) < 0)
4333 error ("size of array %qs is negative", name
);
4334 size
= integer_one_node
;
4337 else if ((decl_context
== NORMAL
|| decl_context
== FIELD
)
4338 && current_scope
== file_scope
)
4340 error ("variably modified %qs at file scope", name
);
4341 size
= integer_one_node
;
4345 /* Make sure the array size remains visibly
4346 nonconstant even if it is (eg) a const variable
4347 with known value. */
4349 warn_variable_length_array (orig_name
, size
);
4352 if (integer_zerop (size
))
4354 /* A zero-length array cannot be represented with
4355 an unsigned index type, which is what we'll
4356 get with build_index_type. Create an
4357 open-ended range instead. */
4358 itype
= build_range_type (sizetype
, size
, NULL_TREE
);
4362 /* Arrange for the SAVE_EXPR on the inside of the
4363 MINUS_EXPR, which allows the -1 to get folded
4364 with the +1 that happens when building TYPE_SIZE. */
4366 size
= variable_size (size
);
4368 /* Compute the maximum valid index, that is, size
4369 - 1. Do the calculation in index_type, so that
4370 if it is a variable the computations will be
4371 done in the proper mode. */
4372 itype
= fold_build2 (MINUS_EXPR
, index_type
,
4373 convert (index_type
, size
),
4374 convert (index_type
,
4377 /* If that overflowed, the array is too big. ???
4378 While a size of INT_MAX+1 technically shouldn't
4379 cause an overflow (because we subtract 1), the
4380 overflow is recorded during the conversion to
4381 index_type, before the subtraction. Handling
4382 this case seems like an unnecessary
4384 if (TREE_CODE (itype
) == INTEGER_CST
4385 && TREE_OVERFLOW (itype
))
4387 error ("size of array %qs is too large", name
);
4388 type
= error_mark_node
;
4392 itype
= build_index_type (itype
);
4395 else if (decl_context
== FIELD
)
4397 if (pedantic
&& !flag_isoc99
&& !in_system_header
)
4398 pedwarn ("ISO C90 does not support flexible array members");
4400 /* ISO C99 Flexible array members are effectively
4401 identical to GCC's zero-length array extension. */
4402 itype
= build_range_type (sizetype
, size_zero_node
, NULL_TREE
);
4404 else if (decl_context
== PARM
)
4406 if (array_parm_vla_unspec_p
)
4411 error ("%<[*]%> not allowed in other than a declaration");
4414 itype
= build_range_type (sizetype
, size_zero_node
, NULL_TREE
);
4418 else if (decl_context
== TYPENAME
)
4420 if (array_parm_vla_unspec_p
)
4422 /* The error is printed elsewhere. We use this to
4423 avoid messing up with incomplete array types of
4424 the same type, that would otherwise be modified
4426 itype
= build_range_type (sizetype
, size_zero_node
,
4431 /* Complain about arrays of incomplete types. */
4432 if (!COMPLETE_TYPE_P (type
))
4434 error ("array type has incomplete element type");
4435 type
= error_mark_node
;
4438 /* When itype is NULL, a shared incomplete array type is
4439 returned for all array of a given type. Elsewhere we
4440 make sure we don't complete that type before copying
4441 it, but here we want to make sure we don't ever
4442 modify the shared type, so we gcc_assert (itype)
4444 type
= build_array_type (type
, itype
);
4446 if (type
!= error_mark_node
)
4450 /* It is ok to modify type here even if itype is
4451 NULL: if size_varies, we're in a
4452 multi-dimensional array and the inner type has
4453 variable size, so the enclosing shared array type
4455 if (size
&& TREE_CODE (size
) == INTEGER_CST
)
4457 = build_distinct_type_copy (TYPE_MAIN_VARIANT (type
));
4458 C_TYPE_VARIABLE_SIZE (type
) = 1;
4461 /* The GCC extension for zero-length arrays differs from
4462 ISO flexible array members in that sizeof yields
4464 if (size
&& integer_zerop (size
))
4467 TYPE_SIZE (type
) = bitsize_zero_node
;
4468 TYPE_SIZE_UNIT (type
) = size_zero_node
;
4470 if (array_parm_vla_unspec_p
)
4473 /* The type is complete. C99 6.7.5.2p4 */
4474 TYPE_SIZE (type
) = bitsize_zero_node
;
4475 TYPE_SIZE_UNIT (type
) = size_zero_node
;
4479 if (decl_context
!= PARM
4480 && (array_ptr_quals
!= TYPE_UNQUALIFIED
4481 || array_ptr_attrs
!= NULL_TREE
4482 || array_parm_static
))
4484 error ("static or type qualifiers in non-parameter array declarator");
4485 array_ptr_quals
= TYPE_UNQUALIFIED
;
4486 array_ptr_attrs
= NULL_TREE
;
4487 array_parm_static
= 0;
4493 /* Say it's a definition only for the declarator closest
4494 to the identifier, apart possibly from some
4496 bool really_funcdef
= false;
4500 const struct c_declarator
*t
= declarator
->declarator
;
4501 while (t
->kind
== cdk_attrs
)
4503 really_funcdef
= (t
->kind
== cdk_id
);
4506 /* Declaring a function type. Make sure we have a valid
4507 type for the function to return. */
4508 if (type
== error_mark_node
)
4513 /* Warn about some types functions can't return. */
4514 if (TREE_CODE (type
) == FUNCTION_TYPE
)
4516 error ("%qs declared as function returning a function", name
);
4517 type
= integer_type_node
;
4519 if (TREE_CODE (type
) == ARRAY_TYPE
)
4521 error ("%qs declared as function returning an array", name
);
4522 type
= integer_type_node
;
4525 /* Construct the function type and go to the next
4526 inner layer of declarator. */
4527 arg_info
= declarator
->u
.arg_info
;
4528 arg_types
= grokparms (arg_info
, really_funcdef
);
4530 put_pending_sizes (arg_info
->pending_sizes
);
4532 /* Type qualifiers before the return type of the function
4533 qualify the return type, not the function type. */
4536 /* Type qualifiers on a function return type are
4537 normally permitted by the standard but have no
4538 effect, so give a warning at -Wreturn-type.
4539 Qualifiers on a void return type are banned on
4540 function definitions in ISO C; GCC used to used
4541 them for noreturn functions. */
4542 if (VOID_TYPE_P (type
) && really_funcdef
)
4543 pedwarn ("function definition has qualified void return type");
4545 warning (OPT_Wreturn_type
,
4546 "type qualifiers ignored on function return type");
4548 type
= c_build_qualified_type (type
, type_quals
);
4550 type_quals
= TYPE_UNQUALIFIED
;
4552 type
= build_function_type (type
, arg_types
);
4553 declarator
= declarator
->declarator
;
4555 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4556 the formal parameter list of this FUNCTION_TYPE to point to
4557 the FUNCTION_TYPE node itself. */
4561 for (link
= arg_info
->tags
;
4563 link
= TREE_CHAIN (link
))
4564 TYPE_CONTEXT (TREE_VALUE (link
)) = type
;
4570 /* Merge any constancy or volatility into the target type
4573 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
4575 pedwarn ("ISO C forbids qualified function types");
4577 type
= c_build_qualified_type (type
, type_quals
);
4580 /* When the pointed-to type involves components of variable size,
4581 care must be taken to ensure that the size evaluation code is
4582 emitted early enough to dominate all the possible later uses
4583 and late enough for the variables on which it depends to have
4586 This is expected to happen automatically when the pointed-to
4587 type has a name/declaration of it's own, but special attention
4588 is required if the type is anonymous.
4590 We handle the NORMAL and FIELD contexts here by attaching an
4591 artificial TYPE_DECL to such pointed-to type. This forces the
4592 sizes evaluation at a safe point and ensures it is not deferred
4593 until e.g. within a deeper conditional context.
4595 We expect nothing to be needed here for PARM or TYPENAME.
4596 Pushing a TYPE_DECL at this point for TYPENAME would actually
4597 be incorrect, as we might be in the middle of an expression
4598 with side effects on the pointed-to type size "arguments" prior
4599 to the pointer declaration point and the fake TYPE_DECL in the
4600 enclosing context would force the size evaluation prior to the
4603 if (!TYPE_NAME (type
)
4604 && (decl_context
== NORMAL
|| decl_context
== FIELD
)
4605 && variably_modified_type_p (type
, NULL_TREE
))
4607 tree decl
= build_decl (TYPE_DECL
, NULL_TREE
, type
);
4608 DECL_ARTIFICIAL (decl
) = 1;
4610 finish_decl (decl
, NULL_TREE
, NULL_TREE
);
4611 TYPE_NAME (type
) = decl
;
4614 type
= build_pointer_type (type
);
4616 /* Process type qualifiers (such as const or volatile)
4617 that were given inside the `*'. */
4618 type_quals
= declarator
->u
.pointer_quals
;
4620 declarator
= declarator
->declarator
;
4628 /* Now TYPE has the actual type, apart from any qualifiers in
4631 /* Check the type and width of a bit-field. */
4633 check_bitfield_type_and_width (&type
, width
, orig_name
);
4635 /* Did array size calculations overflow? */
4637 if (TREE_CODE (type
) == ARRAY_TYPE
4638 && COMPLETE_TYPE_P (type
)
4639 && TREE_CODE (TYPE_SIZE_UNIT (type
)) == INTEGER_CST
4640 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type
)))
4642 error ("size of array %qs is too large", name
);
4643 /* If we proceed with the array type as it is, we'll eventually
4644 crash in tree_low_cst(). */
4645 type
= error_mark_node
;
4648 /* If this is declaring a typedef name, return a TYPE_DECL. */
4650 if (storage_class
== csc_typedef
)
4653 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
4655 pedwarn ("ISO C forbids qualified function types");
4657 type
= c_build_qualified_type (type
, type_quals
);
4658 decl
= build_decl (TYPE_DECL
, declarator
->u
.id
, type
);
4659 if (declspecs
->explicit_signed_p
)
4660 C_TYPEDEF_EXPLICITLY_SIGNED (decl
) = 1;
4661 decl_attributes (&decl
, returned_attrs
, 0);
4662 if (declspecs
->inline_p
)
4663 pedwarn ("typedef %q+D declared %<inline%>", decl
);
4667 /* If this is a type name (such as, in a cast or sizeof),
4668 compute the type and return it now. */
4670 if (decl_context
== TYPENAME
)
4672 /* Note that the grammar rejects storage classes in typenames
4674 gcc_assert (storage_class
== csc_none
&& !threadp
4675 && !declspecs
->inline_p
);
4676 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
4678 pedwarn ("ISO C forbids const or volatile function types");
4680 type
= c_build_qualified_type (type
, type_quals
);
4681 decl_attributes (&type
, returned_attrs
, 0);
4685 if (pedantic
&& decl_context
== FIELD
4686 && variably_modified_type_p (type
, NULL_TREE
))
4689 pedwarn ("a member of a structure or union cannot have a variably modified type");
4692 /* Aside from typedefs and type names (handle above),
4693 `void' at top level (not within pointer)
4694 is allowed only in public variables.
4695 We don't complain about parms either, but that is because
4696 a better error message can be made later. */
4698 if (VOID_TYPE_P (type
) && decl_context
!= PARM
4699 && !((decl_context
!= FIELD
&& TREE_CODE (type
) != FUNCTION_TYPE
)
4700 && (storage_class
== csc_extern
4701 || (current_scope
== file_scope
4702 && !(storage_class
== csc_static
4703 || storage_class
== csc_register
)))))
4705 error ("variable or field %qs declared void", name
);
4706 type
= integer_type_node
;
4709 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4710 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4715 if (decl_context
== PARM
)
4717 tree type_as_written
;
4720 /* A parameter declared as an array of T is really a pointer to T.
4721 One declared as a function is really a pointer to a function. */
4723 if (TREE_CODE (type
) == ARRAY_TYPE
)
4725 /* Transfer const-ness of array into that of type pointed to. */
4726 type
= TREE_TYPE (type
);
4728 type
= c_build_qualified_type (type
, type_quals
);
4729 type
= build_pointer_type (type
);
4730 type_quals
= array_ptr_quals
;
4732 /* We don't yet implement attributes in this context. */
4733 if (array_ptr_attrs
!= NULL_TREE
)
4734 warning (OPT_Wattributes
,
4735 "attributes in parameter array declarator ignored");
4739 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
4741 if (pedantic
&& type_quals
)
4742 pedwarn ("ISO C forbids qualified function types");
4744 type
= c_build_qualified_type (type
, type_quals
);
4745 type
= build_pointer_type (type
);
4746 type_quals
= TYPE_UNQUALIFIED
;
4748 else if (type_quals
)
4749 type
= c_build_qualified_type (type
, type_quals
);
4751 type_as_written
= type
;
4753 decl
= build_decl (PARM_DECL
, declarator
->u
.id
, type
);
4755 C_DECL_VARIABLE_SIZE (decl
) = 1;
4757 /* Compute the type actually passed in the parmlist,
4758 for the case where there is no prototype.
4759 (For example, shorts and chars are passed as ints.)
4760 When there is a prototype, this is overridden later. */
4762 if (type
== error_mark_node
)
4763 promoted_type
= type
;
4765 promoted_type
= c_type_promotes_to (type
);
4767 DECL_ARG_TYPE (decl
) = promoted_type
;
4768 if (declspecs
->inline_p
)
4769 pedwarn ("parameter %q+D declared %<inline%>", decl
);
4771 else if (decl_context
== FIELD
)
4773 /* Note that the grammar rejects storage classes in typenames
4775 gcc_assert (storage_class
== csc_none
&& !threadp
4776 && !declspecs
->inline_p
);
4778 /* Structure field. It may not be a function. */
4780 if (TREE_CODE (type
) == FUNCTION_TYPE
)
4782 error ("field %qs declared as a function", name
);
4783 type
= build_pointer_type (type
);
4785 else if (TREE_CODE (type
) != ERROR_MARK
4786 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type
))
4788 error ("field %qs has incomplete type", name
);
4789 type
= error_mark_node
;
4791 type
= c_build_qualified_type (type
, type_quals
);
4792 decl
= build_decl (FIELD_DECL
, declarator
->u
.id
, type
);
4793 DECL_NONADDRESSABLE_P (decl
) = bitfield
;
4794 if (bitfield
&& !declarator
->u
.id
)
4795 TREE_NO_WARNING (decl
) = 1;
4798 C_DECL_VARIABLE_SIZE (decl
) = 1;
4800 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
4802 if (storage_class
== csc_register
|| threadp
)
4804 error ("invalid storage class for function %qs", name
);
4806 else if (current_scope
!= file_scope
)
4808 /* Function declaration not at file scope. Storage
4809 classes other than `extern' are not allowed, C99
4810 6.7.1p5, and `extern' makes no difference. However,
4811 GCC allows 'auto', perhaps with 'inline', to support
4812 nested functions. */
4813 if (storage_class
== csc_auto
)
4816 pedwarn ("invalid storage class for function %qs", name
);
4818 else if (storage_class
== csc_static
)
4820 error ("invalid storage class for function %qs", name
);
4822 storage_class
= declspecs
->storage_class
= csc_none
;
4828 decl
= build_decl (FUNCTION_DECL
, declarator
->u
.id
, type
);
4829 decl
= build_decl_attribute_variant (decl
, decl_attr
);
4831 DECL_LANG_SPECIFIC (decl
) = GGC_CNEW (struct lang_decl
);
4833 if (pedantic
&& type_quals
&& !DECL_IN_SYSTEM_HEADER (decl
))
4834 pedwarn ("ISO C forbids qualified function types");
4836 /* GNU C interprets a volatile-qualified function type to indicate
4837 that the function does not return. */
4838 if ((type_quals
& TYPE_QUAL_VOLATILE
)
4839 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl
))))
4840 warning (0, "%<noreturn%> function returns non-void value");
4842 /* Every function declaration is an external reference
4843 (DECL_EXTERNAL) except for those which are not at file
4844 scope and are explicitly declared "auto". This is
4845 forbidden by standard C (C99 6.7.1p5) and is interpreted by
4846 GCC to signify a forward declaration of a nested function. */
4847 if (storage_class
== csc_auto
&& current_scope
!= file_scope
)
4848 DECL_EXTERNAL (decl
) = 0;
4849 /* In C99, a function which is declared 'inline' with 'extern'
4850 is not an external reference (which is confusing). It
4851 means that the later definition of the function must be output
4852 in this file, C99 6.7.4p6. In GNU C89, a function declared
4853 'extern inline' is an external reference. */
4854 else if (declspecs
->inline_p
&& storage_class
!= csc_static
)
4855 DECL_EXTERNAL (decl
) = ((storage_class
== csc_extern
)
4856 == flag_gnu89_inline
);
4858 DECL_EXTERNAL (decl
) = !initialized
;
4860 /* Record absence of global scope for `static' or `auto'. */
4862 = !(storage_class
== csc_static
|| storage_class
== csc_auto
);
4864 /* For a function definition, record the argument information
4865 block where store_parm_decls will look for it. */
4867 current_function_arg_info
= arg_info
;
4869 if (declspecs
->default_int_p
)
4870 C_FUNCTION_IMPLICIT_INT (decl
) = 1;
4872 /* Record presence of `inline', if it is reasonable. */
4873 if (flag_hosted
&& MAIN_NAME_P (declarator
->u
.id
))
4875 if (declspecs
->inline_p
)
4876 pedwarn ("cannot inline function %<main%>");
4878 else if (declspecs
->inline_p
)
4880 /* Record that the function is declared `inline'. */
4881 DECL_DECLARED_INLINE_P (decl
) = 1;
4883 /* Do not mark bare declarations as DECL_INLINE. Doing so
4884 in the presence of multiple declarations can result in
4885 the abstract origin pointing between the declarations,
4886 which will confuse dwarf2out. */
4888 DECL_INLINE (decl
) = 1;
4890 /* If -finline-functions, assume it can be inlined. This does
4891 two things: let the function be deferred until it is actually
4892 needed, and let dwarf2 know that the function is inlinable. */
4893 else if (flag_inline_trees
== 2 && initialized
)
4894 DECL_INLINE (decl
) = 1;
4898 /* It's a variable. */
4899 /* An uninitialized decl with `extern' is a reference. */
4900 int extern_ref
= !initialized
&& storage_class
== csc_extern
;
4902 type
= c_build_qualified_type (type
, type_quals
);
4904 /* C99 6.2.2p7: It is invalid (compile-time undefined
4905 behavior) to create an 'extern' declaration for a
4906 variable if there is a global declaration that is
4907 'static' and the global declaration is not visible.
4908 (If the static declaration _is_ currently visible,
4909 the 'extern' declaration is taken to refer to that decl.) */
4910 if (extern_ref
&& current_scope
!= file_scope
)
4912 tree global_decl
= identifier_global_value (declarator
->u
.id
);
4913 tree visible_decl
= lookup_name (declarator
->u
.id
);
4916 && global_decl
!= visible_decl
4917 && TREE_CODE (global_decl
) == VAR_DECL
4918 && !TREE_PUBLIC (global_decl
))
4919 error ("variable previously declared %<static%> redeclared "
4923 decl
= build_decl (VAR_DECL
, declarator
->u
.id
, type
);
4924 DECL_SOURCE_LOCATION (decl
) = declarator
->id_loc
;
4926 C_DECL_VARIABLE_SIZE (decl
) = 1;
4928 if (declspecs
->inline_p
)
4929 pedwarn ("variable %q+D declared %<inline%>", decl
);
4931 /* At file scope, an initialized extern declaration may follow
4932 a static declaration. In that case, DECL_EXTERNAL will be
4933 reset later in start_decl. */
4934 DECL_EXTERNAL (decl
) = (storage_class
== csc_extern
);
4936 /* At file scope, the presence of a `static' or `register' storage
4937 class specifier, or the absence of all storage class specifiers
4938 makes this declaration a definition (perhaps tentative). Also,
4939 the absence of `static' makes it public. */
4940 if (current_scope
== file_scope
)
4942 TREE_PUBLIC (decl
) = storage_class
!= csc_static
;
4943 TREE_STATIC (decl
) = !extern_ref
;
4945 /* Not at file scope, only `static' makes a static definition. */
4948 TREE_STATIC (decl
) = (storage_class
== csc_static
);
4949 TREE_PUBLIC (decl
) = extern_ref
;
4953 DECL_TLS_MODEL (decl
) = decl_default_tls_model (decl
);
4956 if (storage_class
== csc_extern
4957 && variably_modified_type_p (type
, NULL_TREE
))
4960 error ("object with variably modified type must have no linkage");
4963 /* Record `register' declaration for warnings on &
4964 and in case doing stupid register allocation. */
4966 if (storage_class
== csc_register
)
4968 C_DECL_REGISTER (decl
) = 1;
4969 DECL_REGISTER (decl
) = 1;
4972 /* Record constancy and volatility. */
4973 c_apply_type_quals_to_decl (type_quals
, decl
);
4975 /* If a type has volatile components, it should be stored in memory.
4976 Otherwise, the fact that those components are volatile
4977 will be ignored, and would even crash the compiler.
4978 Of course, this only makes sense on VAR,PARM, and RESULT decl's. */
4979 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl
))
4980 && (TREE_CODE (decl
) == VAR_DECL
|| TREE_CODE (decl
) == PARM_DECL
4981 || TREE_CODE (decl
) == RESULT_DECL
))
4983 /* It is not an error for a structure with volatile fields to
4984 be declared register, but reset DECL_REGISTER since it
4985 cannot actually go in a register. */
4986 int was_reg
= C_DECL_REGISTER (decl
);
4987 C_DECL_REGISTER (decl
) = 0;
4988 DECL_REGISTER (decl
) = 0;
4989 c_mark_addressable (decl
);
4990 C_DECL_REGISTER (decl
) = was_reg
;
4993 /* This is the earliest point at which we might know the assembler
4994 name of a variable. Thus, if it's known before this, die horribly. */
4995 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl
));
4997 decl_attributes (&decl
, returned_attrs
, 0);
5003 /* Decode the parameter-list info for a function type or function definition.
5004 The argument is the value returned by `get_parm_info' (or made in c-parse.c
5005 if there is an identifier list instead of a parameter decl list).
5006 These two functions are separate because when a function returns
5007 or receives functions then each is called multiple times but the order
5008 of calls is different. The last call to `grokparms' is always the one
5009 that contains the formal parameter names of a function definition.
5011 Return a list of arg types to use in the FUNCTION_TYPE for this function.
5013 FUNCDEF_FLAG is true for a function definition, false for
5014 a mere declaration. A nonempty identifier-list gets an error message
5015 when FUNCDEF_FLAG is false. */
5018 grokparms (struct c_arg_info
*arg_info
, bool funcdef_flag
)
5020 tree arg_types
= arg_info
->types
;
5022 if (funcdef_flag
&& arg_info
->had_vla_unspec
)
5024 /* A function definition isn't function prototype scope C99 6.2.1p4. */
5026 error ("%<[*]%> not allowed in other than function prototype scope");
5029 if (arg_types
== 0 && !funcdef_flag
&& !in_system_header
)
5030 warning (OPT_Wstrict_prototypes
,
5031 "function declaration isn%'t a prototype");
5033 if (arg_types
== error_mark_node
)
5034 return 0; /* don't set TYPE_ARG_TYPES in this case */
5036 else if (arg_types
&& TREE_CODE (TREE_VALUE (arg_types
)) == IDENTIFIER_NODE
)
5039 pedwarn ("parameter names (without types) in function declaration");
5041 arg_info
->parms
= arg_info
->types
;
5042 arg_info
->types
= 0;
5047 tree parm
, type
, typelt
;
5048 unsigned int parmno
;
5050 /* If there is a parameter of incomplete type in a definition,
5051 this is an error. In a declaration this is valid, and a
5052 struct or union type may be completed later, before any calls
5053 or definition of the function. In the case where the tag was
5054 first declared within the parameter list, a warning has
5055 already been given. If a parameter has void type, then
5056 however the function cannot be defined or called, so
5059 for (parm
= arg_info
->parms
, typelt
= arg_types
, parmno
= 1;
5061 parm
= TREE_CHAIN (parm
), typelt
= TREE_CHAIN (typelt
), parmno
++)
5063 type
= TREE_VALUE (typelt
);
5064 if (type
== error_mark_node
)
5067 if (!COMPLETE_TYPE_P (type
))
5071 if (DECL_NAME (parm
))
5072 error ("parameter %u (%q+D) has incomplete type",
5075 error ("%Jparameter %u has incomplete type",
5078 TREE_VALUE (typelt
) = error_mark_node
;
5079 TREE_TYPE (parm
) = error_mark_node
;
5081 else if (VOID_TYPE_P (type
))
5083 if (DECL_NAME (parm
))
5084 warning (0, "parameter %u (%q+D) has void type",
5087 warning (0, "%Jparameter %u has void type",
5092 if (DECL_NAME (parm
) && TREE_USED (parm
))
5093 warn_if_shadowing (parm
);
5099 /* Take apart the current scope and return a c_arg_info structure with
5100 info on a parameter list just parsed.
5102 This structure is later fed to 'grokparms' and 'store_parm_decls'.
5104 ELLIPSIS being true means the argument list ended in '...' so don't
5105 append a sentinel (void_list_node) to the end of the type-list. */
5108 get_parm_info (bool ellipsis
)
5110 struct c_binding
*b
= current_scope
->bindings
;
5111 struct c_arg_info
*arg_info
= XOBNEW (&parser_obstack
,
5118 static bool explained_incomplete_types
= false;
5119 bool gave_void_only_once_err
= false;
5121 arg_info
->parms
= 0;
5123 arg_info
->types
= 0;
5124 arg_info
->others
= 0;
5125 arg_info
->pending_sizes
= 0;
5126 arg_info
->had_vla_unspec
= current_scope
->had_vla_unspec
;
5128 /* The bindings in this scope must not get put into a block.
5129 We will take care of deleting the binding nodes. */
5130 current_scope
->bindings
= 0;
5132 /* This function is only called if there was *something* on the
5136 /* A parameter list consisting solely of 'void' indicates that the
5137 function takes no arguments. But if the 'void' is qualified
5138 (by 'const' or 'volatile'), or has a storage class specifier
5139 ('register'), then the behavior is undefined; issue an error.
5140 Typedefs for 'void' are OK (see DR#157). */
5141 if (b
->prev
== 0 /* one binding */
5142 && TREE_CODE (b
->decl
) == PARM_DECL
/* which is a parameter */
5143 && !DECL_NAME (b
->decl
) /* anonymous */
5144 && VOID_TYPE_P (TREE_TYPE (b
->decl
))) /* of void type */
5146 if (TREE_THIS_VOLATILE (b
->decl
)
5147 || TREE_READONLY (b
->decl
)
5148 || C_DECL_REGISTER (b
->decl
))
5149 error ("%<void%> as only parameter may not be qualified");
5151 /* There cannot be an ellipsis. */
5153 error ("%<void%> must be the only parameter");
5155 arg_info
->types
= void_list_node
;
5160 types
= void_list_node
;
5162 /* Break up the bindings list into parms, tags, types, and others;
5163 apply sanity checks; purge the name-to-decl bindings. */
5166 tree decl
= b
->decl
;
5167 tree type
= TREE_TYPE (decl
);
5168 const char *keyword
;
5170 switch (TREE_CODE (decl
))
5175 gcc_assert (I_SYMBOL_BINDING (b
->id
) == b
);
5176 I_SYMBOL_BINDING (b
->id
) = b
->shadowed
;
5179 /* Check for forward decls that never got their actual decl. */
5180 if (TREE_ASM_WRITTEN (decl
))
5181 error ("parameter %q+D has just a forward declaration", decl
);
5182 /* Check for (..., void, ...) and issue an error. */
5183 else if (VOID_TYPE_P (type
) && !DECL_NAME (decl
))
5185 if (!gave_void_only_once_err
)
5187 error ("%<void%> must be the only parameter");
5188 gave_void_only_once_err
= true;
5193 /* Valid parameter, add it to the list. */
5194 TREE_CHAIN (decl
) = parms
;
5197 /* Since there is a prototype, args are passed in their
5198 declared types. The back end may override this later. */
5199 DECL_ARG_TYPE (decl
) = type
;
5200 types
= tree_cons (0, type
, types
);
5204 case ENUMERAL_TYPE
: keyword
= "enum"; goto tag
;
5205 case UNION_TYPE
: keyword
= "union"; goto tag
;
5206 case RECORD_TYPE
: keyword
= "struct"; goto tag
;
5208 /* Types may not have tag-names, in which case the type
5209 appears in the bindings list with b->id NULL. */
5212 gcc_assert (I_TAG_BINDING (b
->id
) == b
);
5213 I_TAG_BINDING (b
->id
) = b
->shadowed
;
5216 /* Warn about any struct, union or enum tags defined in a
5217 parameter list. The scope of such types is limited to
5218 the parameter list, which is rarely if ever desirable
5219 (it's impossible to call such a function with type-
5220 correct arguments). An anonymous union parm type is
5221 meaningful as a GNU extension, so don't warn for that. */
5222 if (TREE_CODE (decl
) != UNION_TYPE
|| b
->id
!= 0)
5225 /* The %s will be one of 'struct', 'union', or 'enum'. */
5226 warning (0, "%<%s %E%> declared inside parameter list",
5229 /* The %s will be one of 'struct', 'union', or 'enum'. */
5230 warning (0, "anonymous %s declared inside parameter list",
5233 if (!explained_incomplete_types
)
5235 warning (0, "its scope is only this definition or declaration,"
5236 " which is probably not what you want");
5237 explained_incomplete_types
= true;
5241 tags
= tree_cons (b
->id
, decl
, tags
);
5247 /* CONST_DECLs appear here when we have an embedded enum,
5248 and TYPE_DECLs appear here when we have an embedded struct
5249 or union. No warnings for this - we already warned about the
5250 type itself. FUNCTION_DECLs appear when there is an implicit
5251 function declaration in the parameter list. */
5253 TREE_CHAIN (decl
) = others
;
5258 /* error_mark_node appears here when we have an undeclared
5259 variable. Just throw it away. */
5262 gcc_assert (I_SYMBOL_BINDING (b
->id
) == b
);
5263 I_SYMBOL_BINDING (b
->id
) = b
->shadowed
;
5267 /* Other things that might be encountered. */
5274 b
= free_binding_and_advance (b
);
5277 arg_info
->parms
= parms
;
5278 arg_info
->tags
= tags
;
5279 arg_info
->types
= types
;
5280 arg_info
->others
= others
;
5281 arg_info
->pending_sizes
= get_pending_sizes ();
5285 /* Get the struct, enum or union (CODE says which) with tag NAME.
5286 Define the tag as a forward-reference if it is not defined.
5287 Return a c_typespec structure for the type specifier. */
5290 parser_xref_tag (enum tree_code code
, tree name
)
5292 struct c_typespec ret
;
5293 /* If a cross reference is requested, look up the type
5294 already defined for this tag and return it. */
5296 tree ref
= lookup_tag (code
, name
, 0);
5297 /* If this is the right type of tag, return what we found.
5298 (This reference will be shadowed by shadow_tag later if appropriate.)
5299 If this is the wrong type of tag, do not return it. If it was the
5300 wrong type in the same scope, we will have had an error
5301 message already; if in a different scope and declaring
5302 a name, pending_xref_error will give an error message; but if in a
5303 different scope and not declaring a name, this tag should
5304 shadow the previous declaration of a different type of tag, and
5305 this would not work properly if we return the reference found.
5306 (For example, with "struct foo" in an outer scope, "union foo;"
5307 must shadow that tag with a new one of union type.) */
5308 ret
.kind
= (ref
? ctsk_tagref
: ctsk_tagfirstref
);
5309 if (ref
&& TREE_CODE (ref
) == code
)
5315 /* If no such tag is yet defined, create a forward-reference node
5316 and record it as the "definition".
5317 When a real declaration of this type is found,
5318 the forward-reference will be altered into a real type. */
5320 ref
= make_node (code
);
5321 if (code
== ENUMERAL_TYPE
)
5323 /* Give the type a default layout like unsigned int
5324 to avoid crashing if it does not get defined. */
5325 TYPE_MODE (ref
) = TYPE_MODE (unsigned_type_node
);
5326 TYPE_ALIGN (ref
) = TYPE_ALIGN (unsigned_type_node
);
5327 TYPE_USER_ALIGN (ref
) = 0;
5328 TYPE_UNSIGNED (ref
) = 1;
5329 TYPE_PRECISION (ref
) = TYPE_PRECISION (unsigned_type_node
);
5330 TYPE_MIN_VALUE (ref
) = TYPE_MIN_VALUE (unsigned_type_node
);
5331 TYPE_MAX_VALUE (ref
) = TYPE_MAX_VALUE (unsigned_type_node
);
5334 pushtag (name
, ref
);
5340 /* Get the struct, enum or union (CODE says which) with tag NAME.
5341 Define the tag as a forward-reference if it is not defined.
5342 Return a tree for the type. */
5345 xref_tag (enum tree_code code
, tree name
)
5347 return parser_xref_tag (code
, name
).spec
;
5350 /* Make sure that the tag NAME is defined *in the current scope*
5351 at least as a forward reference.
5352 CODE says which kind of tag NAME ought to be. */
5355 start_struct (enum tree_code code
, tree name
)
5357 /* If there is already a tag defined at this scope
5358 (as a forward reference), just return it. */
5363 ref
= lookup_tag (code
, name
, 1);
5364 if (ref
&& TREE_CODE (ref
) == code
)
5366 if (TYPE_SIZE (ref
))
5368 if (code
== UNION_TYPE
)
5369 error ("redefinition of %<union %E%>", name
);
5371 error ("redefinition of %<struct %E%>", name
);
5373 else if (C_TYPE_BEING_DEFINED (ref
))
5375 if (code
== UNION_TYPE
)
5376 error ("nested redefinition of %<union %E%>", name
);
5378 error ("nested redefinition of %<struct %E%>", name
);
5379 /* Don't create structures that contain themselves. */
5384 /* Otherwise create a forward-reference just so the tag is in scope. */
5386 if (ref
== NULL_TREE
|| TREE_CODE (ref
) != code
)
5388 ref
= make_node (code
);
5389 pushtag (name
, ref
);
5392 C_TYPE_BEING_DEFINED (ref
) = 1;
5393 TYPE_PACKED (ref
) = flag_pack_struct
;
5397 /* Process the specs, declarator and width (NULL if omitted)
5398 of a structure component, returning a FIELD_DECL node.
5399 WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node.
5401 This is done during the parsing of the struct declaration.
5402 The FIELD_DECL nodes are chained together and the lot of them
5403 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5406 grokfield (struct c_declarator
*declarator
, struct c_declspecs
*declspecs
,
5411 if (declarator
->kind
== cdk_id
&& declarator
->u
.id
== NULL_TREE
5412 && width
== NULL_TREE
)
5414 /* This is an unnamed decl.
5416 If we have something of the form "union { list } ;" then this
5417 is the anonymous union extension. Similarly for struct.
5419 If this is something of the form "struct foo;", then
5420 If MS extensions are enabled, this is handled as an
5422 Otherwise this is a forward declaration of a structure tag.
5424 If this is something of the form "foo;" and foo is a TYPE_DECL, then
5425 If MS extensions are enabled and foo names a structure, then
5426 again this is an anonymous struct.
5427 Otherwise this is an error.
5429 Oh what a horrid tangled web we weave. I wonder if MS consciously
5430 took this from Plan 9 or if it was an accident of implementation
5431 that took root before someone noticed the bug... */
5433 tree type
= declspecs
->type
;
5434 bool type_ok
= (TREE_CODE (type
) == RECORD_TYPE
5435 || TREE_CODE (type
) == UNION_TYPE
);
5439 && (flag_ms_extensions
|| !declspecs
->typedef_p
))
5441 if (flag_ms_extensions
)
5445 else if (TYPE_NAME (type
) == NULL
)
5452 pedwarn ("declaration does not declare anything");
5456 pedwarn ("ISO C doesn%'t support unnamed structs/unions");
5459 value
= grokdeclarator (declarator
, declspecs
, FIELD
, false,
5460 width
? &width
: NULL
);
5462 finish_decl (value
, NULL_TREE
, NULL_TREE
);
5463 DECL_INITIAL (value
) = width
;
5468 /* Generate an error for any duplicate field names in FIELDLIST. Munge
5469 the list such that this does not present a problem later. */
5472 detect_field_duplicates (tree fieldlist
)
5477 /* First, see if there are more than "a few" fields.
5478 This is trivially true if there are zero or one fields. */
5481 x
= TREE_CHAIN (fieldlist
);
5487 } while (timeout
> 0 && x
);
5489 /* If there were "few" fields, avoid the overhead of allocating
5490 a hash table. Instead just do the nested traversal thing. */
5493 for (x
= TREE_CHAIN (fieldlist
); x
; x
= TREE_CHAIN (x
))
5496 for (y
= fieldlist
; y
!= x
; y
= TREE_CHAIN (y
))
5497 if (DECL_NAME (y
) == DECL_NAME (x
))
5499 error ("duplicate member %q+D", x
);
5500 DECL_NAME (x
) = NULL_TREE
;
5506 htab_t htab
= htab_create (37, htab_hash_pointer
, htab_eq_pointer
, NULL
);
5509 for (x
= fieldlist
; x
; x
= TREE_CHAIN (x
))
5510 if ((y
= DECL_NAME (x
)) != 0)
5512 slot
= htab_find_slot (htab
, y
, INSERT
);
5515 error ("duplicate member %q+D", x
);
5516 DECL_NAME (x
) = NULL_TREE
;
5525 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5526 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5527 ATTRIBUTES are attributes to be applied to the structure. */
5530 finish_struct (tree t
, tree fieldlist
, tree attributes
)
5533 bool toplevel
= file_scope
== current_scope
;
5534 int saw_named_field
;
5536 /* If this type was previously laid out as a forward reference,
5537 make sure we lay it out again. */
5541 decl_attributes (&t
, attributes
, (int) ATTR_FLAG_TYPE_IN_PLACE
);
5545 for (x
= fieldlist
; x
; x
= TREE_CHAIN (x
))
5546 if (DECL_NAME (x
) != 0)
5551 if (TREE_CODE (t
) == UNION_TYPE
)
5554 pedwarn ("union has no named members");
5556 pedwarn ("union has no members");
5561 pedwarn ("struct has no named members");
5563 pedwarn ("struct has no members");
5568 /* Install struct as DECL_CONTEXT of each field decl.
5569 Also process specified field sizes, found in the DECL_INITIAL,
5570 storing 0 there after the type has been changed to precision equal
5571 to its width, rather than the precision of the specified standard
5572 type. (Correct layout requires the original type to have been preserved
5575 saw_named_field
= 0;
5576 for (x
= fieldlist
; x
; x
= TREE_CHAIN (x
))
5578 if (TREE_TYPE (x
) == error_mark_node
)
5581 DECL_CONTEXT (x
) = t
;
5583 if (TYPE_PACKED (t
) && TYPE_ALIGN (TREE_TYPE (x
)) > BITS_PER_UNIT
)
5584 DECL_PACKED (x
) = 1;
5586 /* If any field is const, the structure type is pseudo-const. */
5587 if (TREE_READONLY (x
))
5588 C_TYPE_FIELDS_READONLY (t
) = 1;
5591 /* A field that is pseudo-const makes the structure likewise. */
5592 tree t1
= TREE_TYPE (x
);
5593 while (TREE_CODE (t1
) == ARRAY_TYPE
)
5594 t1
= TREE_TYPE (t1
);
5595 if ((TREE_CODE (t1
) == RECORD_TYPE
|| TREE_CODE (t1
) == UNION_TYPE
)
5596 && C_TYPE_FIELDS_READONLY (t1
))
5597 C_TYPE_FIELDS_READONLY (t
) = 1;
5600 /* Any field that is volatile means variables of this type must be
5601 treated in some ways as volatile. */
5602 if (TREE_THIS_VOLATILE (x
))
5603 C_TYPE_FIELDS_VOLATILE (t
) = 1;
5605 /* Any field of nominal variable size implies structure is too. */
5606 if (C_DECL_VARIABLE_SIZE (x
))
5607 C_TYPE_VARIABLE_SIZE (t
) = 1;
5609 if (DECL_INITIAL (x
))
5611 unsigned HOST_WIDE_INT width
= tree_low_cst (DECL_INITIAL (x
), 1);
5612 DECL_SIZE (x
) = bitsize_int (width
);
5613 DECL_BIT_FIELD (x
) = 1;
5614 SET_DECL_C_BIT_FIELD (x
);
5617 /* Detect flexible array member in an invalid context. */
5618 if (TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
5619 && TYPE_SIZE (TREE_TYPE (x
)) == NULL_TREE
5620 && TYPE_DOMAIN (TREE_TYPE (x
)) != NULL_TREE
5621 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x
))) == NULL_TREE
)
5623 if (TREE_CODE (t
) == UNION_TYPE
)
5625 error ("%Jflexible array member in union", x
);
5626 TREE_TYPE (x
) = error_mark_node
;
5628 else if (TREE_CHAIN (x
) != NULL_TREE
)
5630 error ("%Jflexible array member not at end of struct", x
);
5631 TREE_TYPE (x
) = error_mark_node
;
5633 else if (!saw_named_field
)
5635 error ("%Jflexible array member in otherwise empty struct", x
);
5636 TREE_TYPE (x
) = error_mark_node
;
5640 if (pedantic
&& !in_system_header
&& TREE_CODE (t
) == RECORD_TYPE
5641 && flexible_array_type_p (TREE_TYPE (x
)))
5642 pedwarn ("%Jinvalid use of structure with flexible array member", x
);
5645 saw_named_field
= 1;
5648 detect_field_duplicates (fieldlist
);
5650 /* Now we have the nearly final fieldlist. Record it,
5651 then lay out the structure or union (including the fields). */
5653 TYPE_FIELDS (t
) = fieldlist
;
5657 /* Give bit-fields their proper types. */
5659 tree
*fieldlistp
= &fieldlist
;
5661 if (TREE_CODE (*fieldlistp
) == FIELD_DECL
&& DECL_INITIAL (*fieldlistp
)
5662 && TREE_TYPE (*fieldlistp
) != error_mark_node
)
5664 unsigned HOST_WIDE_INT width
5665 = tree_low_cst (DECL_INITIAL (*fieldlistp
), 1);
5666 tree type
= TREE_TYPE (*fieldlistp
);
5667 if (width
!= TYPE_PRECISION (type
))
5669 TREE_TYPE (*fieldlistp
)
5670 = c_build_bitfield_integer_type (width
, TYPE_UNSIGNED (type
));
5671 DECL_MODE (*fieldlistp
) = TYPE_MODE (TREE_TYPE (*fieldlistp
));
5673 DECL_INITIAL (*fieldlistp
) = 0;
5676 fieldlistp
= &TREE_CHAIN (*fieldlistp
);
5679 /* Now we have the truly final field list.
5680 Store it in this type and in the variants. */
5682 TYPE_FIELDS (t
) = fieldlist
;
5684 /* If there are lots of fields, sort so we can look through them fast.
5685 We arbitrarily consider 16 or more elts to be "a lot". */
5690 for (x
= fieldlist
; x
; x
= TREE_CHAIN (x
))
5692 if (len
> 15 || DECL_NAME (x
) == NULL
)
5700 struct lang_type
*space
;
5701 struct sorted_fields_type
*space2
;
5703 len
+= list_length (x
);
5705 /* Use the same allocation policy here that make_node uses, to
5706 ensure that this lives as long as the rest of the struct decl.
5707 All decls in an inline function need to be saved. */
5709 space
= GGC_CNEW (struct lang_type
);
5710 space2
= GGC_NEWVAR (struct sorted_fields_type
,
5711 sizeof (struct sorted_fields_type
) + len
* sizeof (tree
));
5715 field_array
= &space2
->elts
[0];
5716 for (x
= fieldlist
; x
; x
= TREE_CHAIN (x
))
5718 field_array
[len
++] = x
;
5720 /* If there is anonymous struct or union, break out of the loop. */
5721 if (DECL_NAME (x
) == NULL
)
5724 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
5727 TYPE_LANG_SPECIFIC (t
) = space
;
5728 TYPE_LANG_SPECIFIC (t
)->s
->len
= len
;
5729 field_array
= TYPE_LANG_SPECIFIC (t
)->s
->elts
;
5730 qsort (field_array
, len
, sizeof (tree
), field_decl_cmp
);
5735 for (x
= TYPE_MAIN_VARIANT (t
); x
; x
= TYPE_NEXT_VARIANT (x
))
5737 TYPE_FIELDS (x
) = TYPE_FIELDS (t
);
5738 TYPE_LANG_SPECIFIC (x
) = TYPE_LANG_SPECIFIC (t
);
5739 C_TYPE_FIELDS_READONLY (x
) = C_TYPE_FIELDS_READONLY (t
);
5740 C_TYPE_FIELDS_VOLATILE (x
) = C_TYPE_FIELDS_VOLATILE (t
);
5741 C_TYPE_VARIABLE_SIZE (x
) = C_TYPE_VARIABLE_SIZE (t
);
5744 /* If this was supposed to be a transparent union, but we can't
5745 make it one, warn and turn off the flag. */
5746 if (TREE_CODE (t
) == UNION_TYPE
5747 && TYPE_TRANSPARENT_UNION (t
)
5748 && (!TYPE_FIELDS (t
) || TYPE_MODE (t
) != DECL_MODE (TYPE_FIELDS (t
))))
5750 TYPE_TRANSPARENT_UNION (t
) = 0;
5751 warning (0, "union cannot be made transparent");
5754 /* If this structure or union completes the type of any previous
5755 variable declaration, lay it out and output its rtl. */
5756 for (x
= C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t
));
5760 tree decl
= TREE_VALUE (x
);
5761 if (TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
)
5762 layout_array_type (TREE_TYPE (decl
));
5763 if (TREE_CODE (decl
) != TYPE_DECL
)
5765 layout_decl (decl
, 0);
5766 if (c_dialect_objc ())
5767 objc_check_decl (decl
);
5768 rest_of_decl_compilation (decl
, toplevel
, 0);
5773 C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t
)) = 0;
5775 /* Finish debugging output for this type. */
5776 rest_of_type_compilation (t
, toplevel
);
5778 /* If we're inside a function proper, i.e. not file-scope and not still
5779 parsing parameters, then arrange for the size of a variable sized type
5781 if (cur_stmt_list
&& variably_modified_type_p (t
, NULL_TREE
))
5782 add_stmt (build_stmt (DECL_EXPR
, build_decl (TYPE_DECL
, NULL
, t
)));
5787 /* Lay out the type T, and its element type, and so on. */
5790 layout_array_type (tree t
)
5792 if (TREE_CODE (TREE_TYPE (t
)) == ARRAY_TYPE
)
5793 layout_array_type (TREE_TYPE (t
));
5797 /* Begin compiling the definition of an enumeration type.
5798 NAME is its name (or null if anonymous).
5799 Returns the type object, as yet incomplete.
5800 Also records info about it so that build_enumerator
5801 may be used to declare the individual values as they are read. */
5804 start_enum (tree name
)
5808 /* If this is the real definition for a previous forward reference,
5809 fill in the contents in the same object that used to be the
5810 forward reference. */
5813 enumtype
= lookup_tag (ENUMERAL_TYPE
, name
, 1);
5815 if (enumtype
== 0 || TREE_CODE (enumtype
) != ENUMERAL_TYPE
)
5817 enumtype
= make_node (ENUMERAL_TYPE
);
5818 pushtag (name
, enumtype
);
5821 if (C_TYPE_BEING_DEFINED (enumtype
))
5822 error ("nested redefinition of %<enum %E%>", name
);
5824 C_TYPE_BEING_DEFINED (enumtype
) = 1;
5826 if (TYPE_VALUES (enumtype
) != 0)
5828 /* This enum is a named one that has been declared already. */
5829 error ("redeclaration of %<enum %E%>", name
);
5831 /* Completely replace its old definition.
5832 The old enumerators remain defined, however. */
5833 TYPE_VALUES (enumtype
) = 0;
5836 enum_next_value
= integer_zero_node
;
5839 if (flag_short_enums
)
5840 TYPE_PACKED (enumtype
) = 1;
5845 /* After processing and defining all the values of an enumeration type,
5846 install their decls in the enumeration type and finish it off.
5847 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5848 and ATTRIBUTES are the specified attributes.
5849 Returns ENUMTYPE. */
5852 finish_enum (tree enumtype
, tree values
, tree attributes
)
5855 tree minnode
= 0, maxnode
= 0;
5856 int precision
, unsign
;
5857 bool toplevel
= (file_scope
== current_scope
);
5858 struct lang_type
*lt
;
5860 decl_attributes (&enumtype
, attributes
, (int) ATTR_FLAG_TYPE_IN_PLACE
);
5862 /* Calculate the maximum value of any enumerator in this type. */
5864 if (values
== error_mark_node
)
5865 minnode
= maxnode
= integer_zero_node
;
5868 minnode
= maxnode
= TREE_VALUE (values
);
5869 for (pair
= TREE_CHAIN (values
); pair
; pair
= TREE_CHAIN (pair
))
5871 tree value
= TREE_VALUE (pair
);
5872 if (tree_int_cst_lt (maxnode
, value
))
5874 if (tree_int_cst_lt (value
, minnode
))
5879 /* Construct the final type of this enumeration. It is the same
5880 as one of the integral types - the narrowest one that fits, except
5881 that normally we only go as narrow as int - and signed iff any of
5882 the values are negative. */
5883 unsign
= (tree_int_cst_sgn (minnode
) >= 0);
5884 precision
= MAX (min_precision (minnode
, unsign
),
5885 min_precision (maxnode
, unsign
));
5887 if (TYPE_PACKED (enumtype
) || precision
> TYPE_PRECISION (integer_type_node
))
5889 tem
= c_common_type_for_size (precision
, unsign
);
5892 warning (0, "enumeration values exceed range of largest integer");
5893 tem
= long_long_integer_type_node
;
5897 tem
= unsign
? unsigned_type_node
: integer_type_node
;
5899 TYPE_MIN_VALUE (enumtype
) = TYPE_MIN_VALUE (tem
);
5900 TYPE_MAX_VALUE (enumtype
) = TYPE_MAX_VALUE (tem
);
5901 TYPE_UNSIGNED (enumtype
) = TYPE_UNSIGNED (tem
);
5902 TYPE_SIZE (enumtype
) = 0;
5904 /* If the precision of the type was specific with an attribute and it
5905 was too small, give an error. Otherwise, use it. */
5906 if (TYPE_PRECISION (enumtype
))
5908 if (precision
> TYPE_PRECISION (enumtype
))
5909 error ("specified mode too small for enumeral values");
5912 TYPE_PRECISION (enumtype
) = TYPE_PRECISION (tem
);
5914 layout_type (enumtype
);
5916 if (values
!= error_mark_node
)
5918 /* Change the type of the enumerators to be the enum type. We
5919 need to do this irrespective of the size of the enum, for
5920 proper type checking. Replace the DECL_INITIALs of the
5921 enumerators, and the value slots of the list, with copies
5922 that have the enum type; they cannot be modified in place
5923 because they may be shared (e.g. integer_zero_node) Finally,
5924 change the purpose slots to point to the names of the decls. */
5925 for (pair
= values
; pair
; pair
= TREE_CHAIN (pair
))
5927 tree enu
= TREE_PURPOSE (pair
);
5928 tree ini
= DECL_INITIAL (enu
);
5930 TREE_TYPE (enu
) = enumtype
;
5932 /* The ISO C Standard mandates enumerators to have type int,
5933 even though the underlying type of an enum type is
5934 unspecified. Here we convert any enumerators that fit in
5935 an int to type int, to avoid promotions to unsigned types
5936 when comparing integers with enumerators that fit in the
5937 int range. When -pedantic is given, build_enumerator()
5938 would have already taken care of those that don't fit. */
5939 if (int_fits_type_p (ini
, integer_type_node
))
5940 tem
= integer_type_node
;
5943 ini
= convert (tem
, ini
);
5945 DECL_INITIAL (enu
) = ini
;
5946 TREE_PURPOSE (pair
) = DECL_NAME (enu
);
5947 TREE_VALUE (pair
) = ini
;
5950 TYPE_VALUES (enumtype
) = values
;
5953 /* Record the min/max values so that we can warn about bit-field
5954 enumerations that are too small for the values. */
5955 lt
= GGC_CNEW (struct lang_type
);
5956 lt
->enum_min
= minnode
;
5957 lt
->enum_max
= maxnode
;
5958 TYPE_LANG_SPECIFIC (enumtype
) = lt
;
5960 /* Fix up all variant types of this enum type. */
5961 for (tem
= TYPE_MAIN_VARIANT (enumtype
); tem
; tem
= TYPE_NEXT_VARIANT (tem
))
5963 if (tem
== enumtype
)
5965 TYPE_VALUES (tem
) = TYPE_VALUES (enumtype
);
5966 TYPE_MIN_VALUE (tem
) = TYPE_MIN_VALUE (enumtype
);
5967 TYPE_MAX_VALUE (tem
) = TYPE_MAX_VALUE (enumtype
);
5968 TYPE_SIZE (tem
) = TYPE_SIZE (enumtype
);
5969 TYPE_SIZE_UNIT (tem
) = TYPE_SIZE_UNIT (enumtype
);
5970 TYPE_MODE (tem
) = TYPE_MODE (enumtype
);
5971 TYPE_PRECISION (tem
) = TYPE_PRECISION (enumtype
);
5972 TYPE_ALIGN (tem
) = TYPE_ALIGN (enumtype
);
5973 TYPE_USER_ALIGN (tem
) = TYPE_USER_ALIGN (enumtype
);
5974 TYPE_UNSIGNED (tem
) = TYPE_UNSIGNED (enumtype
);
5975 TYPE_LANG_SPECIFIC (tem
) = TYPE_LANG_SPECIFIC (enumtype
);
5978 /* Finish debugging output for this type. */
5979 rest_of_type_compilation (enumtype
, toplevel
);
5984 /* Build and install a CONST_DECL for one value of the
5985 current enumeration type (one that was begun with start_enum).
5986 Return a tree-list containing the CONST_DECL and its value.
5987 Assignment of sequential values by default is handled here. */
5990 build_enumerator (tree name
, tree value
)
5994 /* Validate and default VALUE. */
5998 /* Don't issue more errors for error_mark_node (i.e. an
5999 undeclared identifier) - just ignore the value expression. */
6000 if (value
== error_mark_node
)
6002 else if (!INTEGRAL_TYPE_P (TREE_TYPE (value
))
6003 || TREE_CODE (value
) != INTEGER_CST
)
6005 error ("enumerator value for %qE is not an integer constant", name
);
6010 value
= default_conversion (value
);
6011 constant_expression_warning (value
);
6015 /* Default based on previous value. */
6016 /* It should no longer be possible to have NON_LVALUE_EXPR
6020 value
= enum_next_value
;
6022 error ("overflow in enumeration values");
6025 if (pedantic
&& !int_fits_type_p (value
, integer_type_node
))
6027 pedwarn ("ISO C restricts enumerator values to range of %<int%>");
6028 /* XXX This causes -pedantic to change the meaning of the program.
6029 Remove? -zw 2004-03-15 */
6030 value
= convert (integer_type_node
, value
);
6033 /* Set basis for default for next value. */
6034 enum_next_value
= build_binary_op (PLUS_EXPR
, value
, integer_one_node
, 0);
6035 enum_overflow
= tree_int_cst_lt (enum_next_value
, value
);
6037 /* Now create a declaration for the enum value name. */
6039 type
= TREE_TYPE (value
);
6040 type
= c_common_type_for_size (MAX (TYPE_PRECISION (type
),
6041 TYPE_PRECISION (integer_type_node
)),
6042 (TYPE_PRECISION (type
)
6043 >= TYPE_PRECISION (integer_type_node
)
6044 && TYPE_UNSIGNED (type
)));
6046 decl
= build_decl (CONST_DECL
, name
, type
);
6047 DECL_INITIAL (decl
) = convert (type
, value
);
6050 return tree_cons (decl
, value
, NULL_TREE
);
6054 /* Create the FUNCTION_DECL for a function definition.
6055 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
6056 the declaration; they describe the function's name and the type it returns,
6057 but twisted together in a fashion that parallels the syntax of C.
6059 This function creates a binding context for the function body
6060 as well as setting up the FUNCTION_DECL in current_function_decl.
6062 Returns 1 on success. If the DECLARATOR is not suitable for a function
6063 (it defines a datum instead), we return 0, which tells
6064 yyparse to report a parse error. */
6067 start_function (struct c_declspecs
*declspecs
, struct c_declarator
*declarator
,
6070 tree decl1
, old_decl
;
6071 tree restype
, resdecl
;
6072 struct c_label_context_se
*nstack_se
;
6073 struct c_label_context_vm
*nstack_vm
;
6075 current_function_returns_value
= 0; /* Assume, until we see it does. */
6076 current_function_returns_null
= 0;
6077 current_function_returns_abnormally
= 0;
6078 warn_about_return_type
= 0;
6079 c_switch_stack
= NULL
;
6081 nstack_se
= XOBNEW (&parser_obstack
, struct c_label_context_se
);
6082 nstack_se
->labels_def
= NULL
;
6083 nstack_se
->labels_used
= NULL
;
6084 nstack_se
->next
= label_context_stack_se
;
6085 label_context_stack_se
= nstack_se
;
6087 nstack_vm
= XOBNEW (&parser_obstack
, struct c_label_context_vm
);
6088 nstack_vm
->labels_def
= NULL
;
6089 nstack_vm
->labels_used
= NULL
;
6090 nstack_vm
->scope
= 0;
6091 nstack_vm
->next
= label_context_stack_vm
;
6092 label_context_stack_vm
= nstack_vm
;
6094 /* Indicate no valid break/continue context by setting these variables
6095 to some non-null, non-label value. We'll notice and emit the proper
6096 error message in c_finish_bc_stmt. */
6097 c_break_label
= c_cont_label
= size_zero_node
;
6099 decl1
= grokdeclarator (declarator
, declspecs
, FUNCDEF
, true, NULL
);
6101 /* If the declarator is not suitable for a function definition,
6102 cause a syntax error. */
6105 label_context_stack_se
= label_context_stack_se
->next
;
6106 label_context_stack_vm
= label_context_stack_vm
->next
;
6110 decl_attributes (&decl1
, attributes
, 0);
6112 if (DECL_DECLARED_INLINE_P (decl1
)
6113 && DECL_UNINLINABLE (decl1
)
6114 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1
)))
6115 warning (OPT_Wattributes
, "inline function %q+D given attribute noinline",
6118 /* Handle gnu_inline attribute. */
6119 if (declspecs
->inline_p
6120 && !flag_gnu89_inline
6121 && TREE_CODE (decl1
) == FUNCTION_DECL
6122 && lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl1
)))
6124 if (declspecs
->storage_class
!= csc_static
)
6125 DECL_EXTERNAL (decl1
) = !DECL_EXTERNAL (decl1
);
6128 announce_function (decl1
);
6130 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1
))))
6132 error ("return type is an incomplete type");
6133 /* Make it return void instead. */
6135 = build_function_type (void_type_node
,
6136 TYPE_ARG_TYPES (TREE_TYPE (decl1
)));
6139 if (warn_about_return_type
)
6140 pedwarn_c99 ("return type defaults to %<int%>");
6142 /* Make the init_value nonzero so pushdecl knows this is not tentative.
6143 error_mark_node is replaced below (in pop_scope) with the BLOCK. */
6144 DECL_INITIAL (decl1
) = error_mark_node
;
6146 /* If this definition isn't a prototype and we had a prototype declaration
6147 before, copy the arg type info from that prototype. */
6148 old_decl
= lookup_name_in_scope (DECL_NAME (decl1
), current_scope
);
6149 if (old_decl
&& TREE_CODE (old_decl
) != FUNCTION_DECL
)
6151 current_function_prototype_locus
= UNKNOWN_LOCATION
;
6152 current_function_prototype_built_in
= false;
6153 current_function_prototype_arg_types
= NULL_TREE
;
6154 if (TYPE_ARG_TYPES (TREE_TYPE (decl1
)) == 0)
6156 if (old_decl
!= 0 && TREE_CODE (TREE_TYPE (old_decl
)) == FUNCTION_TYPE
6157 && comptypes (TREE_TYPE (TREE_TYPE (decl1
)),
6158 TREE_TYPE (TREE_TYPE (old_decl
))))
6160 TREE_TYPE (decl1
) = composite_type (TREE_TYPE (old_decl
),
6162 current_function_prototype_locus
= DECL_SOURCE_LOCATION (old_decl
);
6163 current_function_prototype_built_in
6164 = C_DECL_BUILTIN_PROTOTYPE (old_decl
);
6165 current_function_prototype_arg_types
6166 = TYPE_ARG_TYPES (TREE_TYPE (decl1
));
6168 if (TREE_PUBLIC (decl1
))
6170 /* If there is an external prototype declaration of this
6171 function, record its location but do not copy information
6172 to this decl. This may be an invisible declaration
6173 (built-in or in a scope which has finished) or simply
6174 have more refined argument types than any declaration
6176 struct c_binding
*b
;
6177 for (b
= I_SYMBOL_BINDING (DECL_NAME (decl1
)); b
; b
= b
->shadowed
)
6178 if (B_IN_SCOPE (b
, external_scope
))
6182 tree ext_decl
, ext_type
;
6184 ext_type
= b
->type
? b
->type
: TREE_TYPE (ext_decl
);
6185 if (TREE_CODE (ext_type
) == FUNCTION_TYPE
6186 && comptypes (TREE_TYPE (TREE_TYPE (decl1
)),
6187 TREE_TYPE (ext_type
)))
6189 current_function_prototype_locus
6190 = DECL_SOURCE_LOCATION (ext_decl
);
6191 current_function_prototype_built_in
6192 = C_DECL_BUILTIN_PROTOTYPE (ext_decl
);
6193 current_function_prototype_arg_types
6194 = TYPE_ARG_TYPES (ext_type
);
6200 /* Optionally warn of old-fashioned def with no previous prototype. */
6201 if (warn_strict_prototypes
6202 && old_decl
!= error_mark_node
6203 && TYPE_ARG_TYPES (TREE_TYPE (decl1
)) == 0
6204 && C_DECL_ISNT_PROTOTYPE (old_decl
))
6205 warning (OPT_Wstrict_prototypes
,
6206 "function declaration isn%'t a prototype");
6207 /* Optionally warn of any global def with no previous prototype. */
6208 else if (warn_missing_prototypes
6209 && old_decl
!= error_mark_node
6210 && TREE_PUBLIC (decl1
)
6211 && !MAIN_NAME_P (DECL_NAME (decl1
))
6212 && C_DECL_ISNT_PROTOTYPE (old_decl
))
6213 warning (OPT_Wmissing_prototypes
, "no previous prototype for %q+D", decl1
);
6214 /* Optionally warn of any def with no previous prototype
6215 if the function has already been used. */
6216 else if (warn_missing_prototypes
6218 && old_decl
!= error_mark_node
6219 && TREE_USED (old_decl
)
6220 && TYPE_ARG_TYPES (TREE_TYPE (old_decl
)) == 0)
6221 warning (OPT_Wmissing_prototypes
,
6222 "%q+D was used with no prototype before its definition", decl1
);
6223 /* Optionally warn of any global def with no previous declaration. */
6224 else if (warn_missing_declarations
6225 && TREE_PUBLIC (decl1
)
6227 && !MAIN_NAME_P (DECL_NAME (decl1
)))
6228 warning (OPT_Wmissing_declarations
, "no previous declaration for %q+D",
6230 /* Optionally warn of any def with no previous declaration
6231 if the function has already been used. */
6232 else if (warn_missing_declarations
6234 && old_decl
!= error_mark_node
6235 && TREE_USED (old_decl
)
6236 && C_DECL_IMPLICIT (old_decl
))
6237 warning (OPT_Wmissing_declarations
,
6238 "%q+D was used with no declaration before its definition", decl1
);
6240 /* This function exists in static storage.
6241 (This does not mean `static' in the C sense!) */
6242 TREE_STATIC (decl1
) = 1;
6244 /* A nested function is not global. */
6245 if (current_function_decl
!= 0)
6246 TREE_PUBLIC (decl1
) = 0;
6248 /* This is the earliest point at which we might know the assembler
6249 name of the function. Thus, if it's set before this, die horribly. */
6250 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl1
));
6252 /* If #pragma weak was used, mark the decl weak now. */
6253 if (current_scope
== file_scope
)
6254 maybe_apply_pragma_weak (decl1
);
6256 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
6257 if (warn_main
> 0 && MAIN_NAME_P (DECL_NAME (decl1
)))
6259 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1
)))
6260 != integer_type_node
)
6261 pedwarn ("return type of %q+D is not %<int%>", decl1
);
6263 check_main_parameter_types(decl1
);
6265 if (!TREE_PUBLIC (decl1
))
6266 pedwarn ("%q+D is normally a non-static function", decl1
);
6269 /* Record the decl so that the function name is defined.
6270 If we already have a decl for this name, and it is a FUNCTION_DECL,
6271 use the old decl. */
6273 current_function_decl
= pushdecl (decl1
);
6276 declare_parm_level ();
6278 restype
= TREE_TYPE (TREE_TYPE (current_function_decl
));
6279 /* Promote the value to int before returning it. */
6280 if (c_promoting_integer_type_p (restype
))
6282 /* It retains unsignedness if not really getting wider. */
6283 if (TYPE_UNSIGNED (restype
)
6284 && (TYPE_PRECISION (restype
)
6285 == TYPE_PRECISION (integer_type_node
)))
6286 restype
= unsigned_type_node
;
6288 restype
= integer_type_node
;
6291 resdecl
= build_decl (RESULT_DECL
, NULL_TREE
, restype
);
6292 DECL_ARTIFICIAL (resdecl
) = 1;
6293 DECL_IGNORED_P (resdecl
) = 1;
6294 DECL_RESULT (current_function_decl
) = resdecl
;
6296 start_fname_decls ();
6301 /* Subroutine of store_parm_decls which handles new-style function
6302 definitions (prototype format). The parms already have decls, so we
6303 need only record them as in effect and complain if any redundant
6304 old-style parm decls were written. */
6306 store_parm_decls_newstyle (tree fndecl
, const struct c_arg_info
*arg_info
)
6310 if (current_scope
->bindings
)
6312 error ("%Jold-style parameter declarations in prototyped "
6313 "function definition", fndecl
);
6315 /* Get rid of the old-style declarations. */
6319 /* Don't issue this warning for nested functions, and don't issue this
6320 warning if we got here because ARG_INFO_TYPES was error_mark_node
6321 (this happens when a function definition has just an ellipsis in
6322 its parameter list). */
6323 else if (!in_system_header
&& !current_function_scope
6324 && arg_info
->types
!= error_mark_node
)
6325 warning (OPT_Wtraditional
,
6326 "%Jtraditional C rejects ISO C style function definitions",
6329 /* Now make all the parameter declarations visible in the function body.
6330 We can bypass most of the grunt work of pushdecl. */
6331 for (decl
= arg_info
->parms
; decl
; decl
= TREE_CHAIN (decl
))
6333 DECL_CONTEXT (decl
) = current_function_decl
;
6334 if (DECL_NAME (decl
))
6336 bind (DECL_NAME (decl
), decl
, current_scope
,
6337 /*invisible=*/false, /*nested=*/false);
6338 if (!TREE_USED (decl
))
6339 warn_if_shadowing (decl
);
6342 error ("%Jparameter name omitted", decl
);
6345 /* Record the parameter list in the function declaration. */
6346 DECL_ARGUMENTS (fndecl
) = arg_info
->parms
;
6348 /* Now make all the ancillary declarations visible, likewise. */
6349 for (decl
= arg_info
->others
; decl
; decl
= TREE_CHAIN (decl
))
6351 DECL_CONTEXT (decl
) = current_function_decl
;
6352 if (DECL_NAME (decl
))
6353 bind (DECL_NAME (decl
), decl
, current_scope
,
6354 /*invisible=*/false, /*nested=*/false);
6357 /* And all the tag declarations. */
6358 for (decl
= arg_info
->tags
; decl
; decl
= TREE_CHAIN (decl
))
6359 if (TREE_PURPOSE (decl
))
6360 bind (TREE_PURPOSE (decl
), TREE_VALUE (decl
), current_scope
,
6361 /*invisible=*/false, /*nested=*/false);
6364 /* Subroutine of store_parm_decls which handles old-style function
6365 definitions (separate parameter list and declarations). */
6368 store_parm_decls_oldstyle (tree fndecl
, const struct c_arg_info
*arg_info
)
6370 struct c_binding
*b
;
6371 tree parm
, decl
, last
;
6372 tree parmids
= arg_info
->parms
;
6373 struct pointer_set_t
*seen_args
= pointer_set_create ();
6375 if (!in_system_header
)
6376 warning (OPT_Wold_style_definition
, "%Jold-style function definition",
6379 /* Match each formal parameter name with its declaration. Save each
6380 decl in the appropriate TREE_PURPOSE slot of the parmids chain. */
6381 for (parm
= parmids
; parm
; parm
= TREE_CHAIN (parm
))
6383 if (TREE_VALUE (parm
) == 0)
6385 error ("%Jparameter name missing from parameter list", fndecl
);
6386 TREE_PURPOSE (parm
) = 0;
6390 b
= I_SYMBOL_BINDING (TREE_VALUE (parm
));
6391 if (b
&& B_IN_CURRENT_SCOPE (b
))
6394 /* If we got something other than a PARM_DECL it is an error. */
6395 if (TREE_CODE (decl
) != PARM_DECL
)
6396 error ("%q+D declared as a non-parameter", decl
);
6397 /* If the declaration is already marked, we have a duplicate
6398 name. Complain and ignore the duplicate. */
6399 else if (pointer_set_contains (seen_args
, decl
))
6401 error ("multiple parameters named %q+D", decl
);
6402 TREE_PURPOSE (parm
) = 0;
6405 /* If the declaration says "void", complain and turn it into
6407 else if (VOID_TYPE_P (TREE_TYPE (decl
)))
6409 error ("parameter %q+D declared with void type", decl
);
6410 TREE_TYPE (decl
) = integer_type_node
;
6411 DECL_ARG_TYPE (decl
) = integer_type_node
;
6412 layout_decl (decl
, 0);
6414 warn_if_shadowing (decl
);
6416 /* If no declaration found, default to int. */
6419 decl
= build_decl (PARM_DECL
, TREE_VALUE (parm
), integer_type_node
);
6420 DECL_ARG_TYPE (decl
) = TREE_TYPE (decl
);
6421 DECL_SOURCE_LOCATION (decl
) = DECL_SOURCE_LOCATION (fndecl
);
6423 warn_if_shadowing (decl
);
6426 pedwarn ("type of %q+D defaults to %<int%>", decl
);
6428 warning (OPT_Wmissing_parameter_type
, "type of %q+D defaults to %<int%>", decl
);
6431 TREE_PURPOSE (parm
) = decl
;
6432 pointer_set_insert (seen_args
, decl
);
6435 /* Now examine the parms chain for incomplete declarations
6436 and declarations with no corresponding names. */
6438 for (b
= current_scope
->bindings
; b
; b
= b
->prev
)
6441 if (TREE_CODE (parm
) != PARM_DECL
)
6444 if (TREE_TYPE (parm
) != error_mark_node
6445 && !COMPLETE_TYPE_P (TREE_TYPE (parm
)))
6447 error ("parameter %q+D has incomplete type", parm
);
6448 TREE_TYPE (parm
) = error_mark_node
;
6451 if (!pointer_set_contains (seen_args
, parm
))
6453 error ("declaration for parameter %q+D but no such parameter", parm
);
6455 /* Pretend the parameter was not missing.
6456 This gets us to a standard state and minimizes
6457 further error messages. */
6458 parmids
= chainon (parmids
, tree_cons (parm
, 0, 0));
6462 /* Chain the declarations together in the order of the list of
6463 names. Store that chain in the function decl, replacing the
6464 list of names. Update the current scope to match. */
6465 DECL_ARGUMENTS (fndecl
) = 0;
6467 for (parm
= parmids
; parm
; parm
= TREE_CHAIN (parm
))
6468 if (TREE_PURPOSE (parm
))
6470 if (parm
&& TREE_PURPOSE (parm
))
6472 last
= TREE_PURPOSE (parm
);
6473 DECL_ARGUMENTS (fndecl
) = last
;
6475 for (parm
= TREE_CHAIN (parm
); parm
; parm
= TREE_CHAIN (parm
))
6476 if (TREE_PURPOSE (parm
))
6478 TREE_CHAIN (last
) = TREE_PURPOSE (parm
);
6479 last
= TREE_PURPOSE (parm
);
6481 TREE_CHAIN (last
) = 0;
6484 pointer_set_destroy (seen_args
);
6486 /* If there was a previous prototype,
6487 set the DECL_ARG_TYPE of each argument according to
6488 the type previously specified, and report any mismatches. */
6490 if (current_function_prototype_arg_types
)
6493 for (parm
= DECL_ARGUMENTS (fndecl
),
6494 type
= current_function_prototype_arg_types
;
6495 parm
|| (type
&& TREE_VALUE (type
) != error_mark_node
6496 && (TYPE_MAIN_VARIANT (TREE_VALUE (type
)) != void_type_node
));
6497 parm
= TREE_CHAIN (parm
), type
= TREE_CHAIN (type
))
6499 if (parm
== 0 || type
== 0
6500 || TYPE_MAIN_VARIANT (TREE_VALUE (type
)) == void_type_node
)
6502 if (current_function_prototype_built_in
)
6503 warning (0, "number of arguments doesn%'t match "
6504 "built-in prototype");
6507 error ("number of arguments doesn%'t match prototype");
6508 error ("%Hprototype declaration",
6509 ¤t_function_prototype_locus
);
6513 /* Type for passing arg must be consistent with that
6514 declared for the arg. ISO C says we take the unqualified
6515 type for parameters declared with qualified type. */
6516 if (!comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm
)),
6517 TYPE_MAIN_VARIANT (TREE_VALUE (type
))))
6519 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm
))
6520 == TYPE_MAIN_VARIANT (TREE_VALUE (type
)))
6522 /* Adjust argument to match prototype. E.g. a previous
6523 `int foo(float);' prototype causes
6524 `int foo(x) float x; {...}' to be treated like
6525 `int foo(float x) {...}'. This is particularly
6526 useful for argument types like uid_t. */
6527 DECL_ARG_TYPE (parm
) = TREE_TYPE (parm
);
6529 if (targetm
.calls
.promote_prototypes (TREE_TYPE (current_function_decl
))
6530 && INTEGRAL_TYPE_P (TREE_TYPE (parm
))
6531 && TYPE_PRECISION (TREE_TYPE (parm
))
6532 < TYPE_PRECISION (integer_type_node
))
6533 DECL_ARG_TYPE (parm
) = integer_type_node
;
6537 /* ??? Is it possible to get here with a
6538 built-in prototype or will it always have
6539 been diagnosed as conflicting with an
6540 old-style definition and discarded? */
6541 if (current_function_prototype_built_in
)
6542 warning (0, "promoted argument %qD "
6543 "doesn%'t match built-in prototype", parm
);
6546 pedwarn ("promoted argument %qD "
6547 "doesn%'t match prototype", parm
);
6548 pedwarn ("%Hprototype declaration",
6549 ¤t_function_prototype_locus
);
6555 if (current_function_prototype_built_in
)
6556 warning (0, "argument %qD doesn%'t match "
6557 "built-in prototype", parm
);
6560 error ("argument %qD doesn%'t match prototype", parm
);
6561 error ("%Hprototype declaration",
6562 ¤t_function_prototype_locus
);
6567 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl
)) = 0;
6570 /* Otherwise, create a prototype that would match. */
6574 tree actual
= 0, last
= 0, type
;
6576 for (parm
= DECL_ARGUMENTS (fndecl
); parm
; parm
= TREE_CHAIN (parm
))
6578 type
= tree_cons (NULL_TREE
, DECL_ARG_TYPE (parm
), NULL_TREE
);
6580 TREE_CHAIN (last
) = type
;
6585 type
= tree_cons (NULL_TREE
, void_type_node
, NULL_TREE
);
6587 TREE_CHAIN (last
) = type
;
6591 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6592 of the type of this function, but we need to avoid having this
6593 affect the types of other similarly-typed functions, so we must
6594 first force the generation of an identical (but separate) type
6595 node for the relevant function type. The new node we create
6596 will be a variant of the main variant of the original function
6599 TREE_TYPE (fndecl
) = build_variant_type_copy (TREE_TYPE (fndecl
));
6601 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl
)) = actual
;
6605 /* Store parameter declarations passed in ARG_INFO into the current
6606 function declaration. */
6609 store_parm_decls_from (struct c_arg_info
*arg_info
)
6611 current_function_arg_info
= arg_info
;
6612 store_parm_decls ();
6615 /* Store the parameter declarations into the current function declaration.
6616 This is called after parsing the parameter declarations, before
6617 digesting the body of the function.
6619 For an old-style definition, construct a prototype out of the old-style
6620 parameter declarations and inject it into the function's type. */
6623 store_parm_decls (void)
6625 tree fndecl
= current_function_decl
;
6628 /* The argument information block for FNDECL. */
6629 struct c_arg_info
*arg_info
= current_function_arg_info
;
6630 current_function_arg_info
= 0;
6632 /* True if this definition is written with a prototype. Note:
6633 despite C99 6.7.5.3p14, we can *not* treat an empty argument
6634 list in a function definition as equivalent to (void) -- an
6635 empty argument list specifies the function has no parameters,
6636 but only (void) sets up a prototype for future calls. */
6637 proto
= arg_info
->types
!= 0;
6640 store_parm_decls_newstyle (fndecl
, arg_info
);
6642 store_parm_decls_oldstyle (fndecl
, arg_info
);
6644 /* The next call to push_scope will be a function body. */
6646 next_is_function_body
= true;
6648 /* Write a record describing this function definition to the prototypes
6649 file (if requested). */
6651 gen_aux_info_record (fndecl
, 1, 0, proto
);
6653 /* Initialize the RTL code for the function. */
6654 allocate_struct_function (fndecl
);
6656 /* Begin the statement tree for this function. */
6657 DECL_SAVED_TREE (fndecl
) = push_stmt_list ();
6659 /* ??? Insert the contents of the pending sizes list into the function
6660 to be evaluated. The only reason left to have this is
6661 void foo(int n, int array[n++])
6662 because we throw away the array type in favor of a pointer type, and
6663 thus won't naturally see the SAVE_EXPR containing the increment. All
6664 other pending sizes would be handled by gimplify_parameters. */
6667 for (t
= nreverse (get_pending_sizes ()); t
; t
= TREE_CHAIN (t
))
6668 add_stmt (TREE_VALUE (t
));
6671 /* Even though we're inside a function body, we still don't want to
6672 call expand_expr to calculate the size of a variable-sized array.
6673 We haven't necessarily assigned RTL to all variables yet, so it's
6674 not safe to try to expand expressions involving them. */
6675 cfun
->x_dont_save_pending_sizes_p
= 1;
6678 /* Emit diagnostics that require gimple input for detection. Operate on
6679 FNDECL and all its nested functions. */
6682 c_gimple_diagnostics_recursively (tree fndecl
)
6684 struct cgraph_node
*cgn
;
6686 /* Handle attribute((warn_unused_result)). Relies on gimple input. */
6687 c_warn_unused_result (&DECL_SAVED_TREE (fndecl
));
6689 /* Notice when OpenMP structured block constraints are violated. */
6691 diagnose_omp_structured_block_errors (fndecl
);
6693 /* Finalize all nested functions now. */
6694 cgn
= cgraph_node (fndecl
);
6695 for (cgn
= cgn
->nested
; cgn
; cgn
= cgn
->next_nested
)
6696 c_gimple_diagnostics_recursively (cgn
->decl
);
6699 /* Finish up a function declaration and compile that function
6700 all the way to assembler language output. The free the storage
6701 for the function definition.
6703 This is called after parsing the body of the function definition. */
6706 finish_function (void)
6708 tree fndecl
= current_function_decl
;
6710 label_context_stack_se
= label_context_stack_se
->next
;
6711 label_context_stack_vm
= label_context_stack_vm
->next
;
6713 if (TREE_CODE (fndecl
) == FUNCTION_DECL
6714 && targetm
.calls
.promote_prototypes (TREE_TYPE (fndecl
)))
6716 tree args
= DECL_ARGUMENTS (fndecl
);
6717 for (; args
; args
= TREE_CHAIN (args
))
6719 tree type
= TREE_TYPE (args
);
6720 if (INTEGRAL_TYPE_P (type
)
6721 && TYPE_PRECISION (type
) < TYPE_PRECISION (integer_type_node
))
6722 DECL_ARG_TYPE (args
) = integer_type_node
;
6726 if (DECL_INITIAL (fndecl
) && DECL_INITIAL (fndecl
) != error_mark_node
)
6727 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl
)) = fndecl
;
6729 /* Must mark the RESULT_DECL as being in this function. */
6731 if (DECL_RESULT (fndecl
) && DECL_RESULT (fndecl
) != error_mark_node
)
6732 DECL_CONTEXT (DECL_RESULT (fndecl
)) = fndecl
;
6734 if (MAIN_NAME_P (DECL_NAME (fndecl
)) && flag_hosted
)
6736 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl
)))
6737 != integer_type_node
)
6739 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6740 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6742 pedwarn ("return type of %q+D is not %<int%>", fndecl
);
6748 tree stmt
= c_finish_return (integer_zero_node
);
6749 #ifdef USE_MAPPED_LOCATION
6750 /* Hack. We don't want the middle-end to warn that this return
6751 is unreachable, so we mark its location as special. Using
6752 UNKNOWN_LOCATION has the problem that it gets clobbered in
6753 annotate_one_with_locus. A cleaner solution might be to
6754 ensure ! should_carry_locus_p (stmt), but that needs a flag.
6756 SET_EXPR_LOCATION (stmt
, BUILTINS_LOCATION
);
6758 /* Hack. We don't want the middle-end to warn that this
6759 return is unreachable, so put the statement on the
6761 annotate_with_file_line (stmt
, input_filename
, 0);
6767 /* Tie off the statement tree for this function. */
6768 DECL_SAVED_TREE (fndecl
) = pop_stmt_list (DECL_SAVED_TREE (fndecl
));
6770 finish_fname_decls ();
6772 /* Complain if there's just no return statement. */
6773 if (warn_return_type
6774 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl
))) != VOID_TYPE
6775 && !current_function_returns_value
&& !current_function_returns_null
6776 /* Don't complain if we are no-return. */
6777 && !current_function_returns_abnormally
6778 /* Don't warn for main(). */
6779 && !MAIN_NAME_P (DECL_NAME (fndecl
))
6780 /* Or if they didn't actually specify a return type. */
6781 && !C_FUNCTION_IMPLICIT_INT (fndecl
)
6782 /* Normally, with -Wreturn-type, flow will complain. Unless we're an
6783 inline function, as we might never be compiled separately. */
6784 && DECL_INLINE (fndecl
))
6786 warning (OPT_Wreturn_type
,
6787 "no return statement in function returning non-void");
6788 TREE_NO_WARNING (fndecl
) = 1;
6791 /* With just -Wextra, complain only if function returns both with
6792 and without a value. */
6794 && current_function_returns_value
6795 && current_function_returns_null
)
6796 warning (OPT_Wextra
, "this function may return with or without a value");
6798 /* Store the end of the function, so that we get good line number
6799 info for the epilogue. */
6800 cfun
->function_end_locus
= input_location
;
6802 /* Keep track of functions declared with the "constructor" and
6803 "destructor" attribute. */
6804 c_record_cdtor_fn (fndecl
);
6806 /* Finalize the ELF visibility for the function. */
6807 c_determine_visibility (fndecl
);
6809 /* Genericize before inlining. Delay genericizing nested functions
6810 until their parent function is genericized. Since finalizing
6811 requires GENERIC, delay that as well. */
6813 if (DECL_INITIAL (fndecl
) && DECL_INITIAL (fndecl
) != error_mark_node
6814 && !undef_nested_function
)
6816 if (!decl_function_context (fndecl
))
6818 c_genericize (fndecl
);
6819 c_gimple_diagnostics_recursively (fndecl
);
6821 /* ??? Objc emits functions after finalizing the compilation unit.
6822 This should be cleaned up later and this conditional removed. */
6823 if (cgraph_global_info_ready
)
6825 c_expand_body (fndecl
);
6829 cgraph_finalize_function (fndecl
, false);
6833 /* Register this function with cgraph just far enough to get it
6834 added to our parent's nested function list. Handy, since the
6835 C front end doesn't have such a list. */
6836 (void) cgraph_node (fndecl
);
6840 if (!decl_function_context (fndecl
))
6841 undef_nested_function
= false;
6843 /* We're leaving the context of this function, so zap cfun.
6844 It's still in DECL_STRUCT_FUNCTION, and we'll restore it in
6845 tree_rest_of_compilation. */
6847 current_function_decl
= NULL
;
6850 /* Check the declarations given in a for-loop for satisfying the C99
6851 constraints. If exactly one such decl is found, return it. */
6854 check_for_loop_decls (void)
6856 struct c_binding
*b
;
6857 tree one_decl
= NULL_TREE
;
6863 /* If we get here, declarations have been used in a for loop without
6864 the C99 for loop scope. This doesn't make much sense, so don't
6866 error ("%<for%> loop initial declaration used outside C99 mode");
6869 /* C99 subclause 6.8.5 paragraph 3:
6871 [#3] The declaration part of a for statement shall only
6872 declare identifiers for objects having storage class auto or
6875 It isn't clear whether, in this sentence, "identifiers" binds to
6876 "shall only declare" or to "objects" - that is, whether all identifiers
6877 declared must be identifiers for objects, or whether the restriction
6878 only applies to those that are. (A question on this in comp.std.c
6879 in November 2000 received no answer.) We implement the strictest
6880 interpretation, to avoid creating an extension which later causes
6883 for (b
= current_scope
->bindings
; b
; b
= b
->prev
)
6886 tree decl
= b
->decl
;
6891 switch (TREE_CODE (decl
))
6894 if (TREE_STATIC (decl
))
6895 error ("declaration of static variable %q+D in %<for%> loop "
6896 "initial declaration", decl
);
6897 else if (DECL_EXTERNAL (decl
))
6898 error ("declaration of %<extern%> variable %q+D in %<for%> loop "
6899 "initial declaration", decl
);
6903 error ("%<struct %E%> declared in %<for%> loop initial declaration",
6907 error ("%<union %E%> declared in %<for%> loop initial declaration",
6911 error ("%<enum %E%> declared in %<for%> loop initial declaration",
6915 error ("declaration of non-variable %q+D in %<for%> loop "
6916 "initial declaration", decl
);
6923 return n_decls
== 1 ? one_decl
: NULL_TREE
;
6926 /* Save and reinitialize the variables
6927 used during compilation of a C function. */
6930 c_push_function_context (struct function
*f
)
6932 struct language_function
*p
;
6933 p
= GGC_NEW (struct language_function
);
6936 p
->base
.x_stmt_tree
= c_stmt_tree
;
6937 p
->x_break_label
= c_break_label
;
6938 p
->x_cont_label
= c_cont_label
;
6939 p
->x_switch_stack
= c_switch_stack
;
6940 p
->arg_info
= current_function_arg_info
;
6941 p
->returns_value
= current_function_returns_value
;
6942 p
->returns_null
= current_function_returns_null
;
6943 p
->returns_abnormally
= current_function_returns_abnormally
;
6944 p
->warn_about_return_type
= warn_about_return_type
;
6947 /* Restore the variables used during compilation of a C function. */
6950 c_pop_function_context (struct function
*f
)
6952 struct language_function
*p
= f
->language
;
6954 if (DECL_STRUCT_FUNCTION (current_function_decl
) == 0
6955 && DECL_SAVED_TREE (current_function_decl
) == NULL_TREE
)
6957 /* Stop pointing to the local nodes about to be freed. */
6958 /* But DECL_INITIAL must remain nonzero so we know this
6959 was an actual function definition. */
6960 DECL_INITIAL (current_function_decl
) = error_mark_node
;
6961 DECL_ARGUMENTS (current_function_decl
) = 0;
6964 c_stmt_tree
= p
->base
.x_stmt_tree
;
6965 c_break_label
= p
->x_break_label
;
6966 c_cont_label
= p
->x_cont_label
;
6967 c_switch_stack
= p
->x_switch_stack
;
6968 current_function_arg_info
= p
->arg_info
;
6969 current_function_returns_value
= p
->returns_value
;
6970 current_function_returns_null
= p
->returns_null
;
6971 current_function_returns_abnormally
= p
->returns_abnormally
;
6972 warn_about_return_type
= p
->warn_about_return_type
;
6977 /* Copy the DECL_LANG_SPECIFIC data associated with DECL. */
6980 c_dup_lang_specific_decl (tree decl
)
6982 struct lang_decl
*ld
;
6984 if (!DECL_LANG_SPECIFIC (decl
))
6987 ld
= GGC_NEW (struct lang_decl
);
6988 memcpy (ld
, DECL_LANG_SPECIFIC (decl
), sizeof (struct lang_decl
));
6989 DECL_LANG_SPECIFIC (decl
) = ld
;
6992 /* The functions below are required for functionality of doing
6993 function at once processing in the C front end. Currently these
6994 functions are not called from anywhere in the C front end, but as
6995 these changes continue, that will change. */
6997 /* Returns the stmt_tree (if any) to which statements are currently
6998 being added. If there is no active statement-tree, NULL is
7002 current_stmt_tree (void)
7004 return &c_stmt_tree
;
7007 /* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
7011 anon_aggr_type_p (tree
ARG_UNUSED (node
))
7016 /* Return the global value of T as a symbol. */
7019 identifier_global_value (tree t
)
7021 struct c_binding
*b
;
7023 for (b
= I_SYMBOL_BINDING (t
); b
; b
= b
->shadowed
)
7024 if (B_IN_FILE_SCOPE (b
) || B_IN_EXTERNAL_SCOPE (b
))
7030 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
7031 otherwise the name is found in ridpointers from RID_INDEX. */
7034 record_builtin_type (enum rid rid_index
, const char *name
, tree type
)
7038 id
= ridpointers
[(int) rid_index
];
7040 id
= get_identifier (name
);
7041 decl
= build_decl (TYPE_DECL
, id
, type
);
7043 if (debug_hooks
->type_decl
)
7044 debug_hooks
->type_decl (decl
, false);
7047 /* Build the void_list_node (void_type_node having been created). */
7049 build_void_list_node (void)
7051 tree t
= build_tree_list (NULL_TREE
, void_type_node
);
7055 /* Return a c_parm structure with the given SPECS, ATTRS and DECLARATOR. */
7058 build_c_parm (struct c_declspecs
*specs
, tree attrs
,
7059 struct c_declarator
*declarator
)
7061 struct c_parm
*ret
= XOBNEW (&parser_obstack
, struct c_parm
);
7064 ret
->declarator
= declarator
;
7068 /* Return a declarator with nested attributes. TARGET is the inner
7069 declarator to which these attributes apply. ATTRS are the
7072 struct c_declarator
*
7073 build_attrs_declarator (tree attrs
, struct c_declarator
*target
)
7075 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
7076 ret
->kind
= cdk_attrs
;
7077 ret
->declarator
= target
;
7078 ret
->u
.attrs
= attrs
;
7082 /* Return a declarator for a function with arguments specified by ARGS
7083 and return type specified by TARGET. */
7085 struct c_declarator
*
7086 build_function_declarator (struct c_arg_info
*args
,
7087 struct c_declarator
*target
)
7089 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
7090 ret
->kind
= cdk_function
;
7091 ret
->declarator
= target
;
7092 ret
->u
.arg_info
= args
;
7096 /* Return a declarator for the identifier IDENT (which may be
7097 NULL_TREE for an abstract declarator). */
7099 struct c_declarator
*
7100 build_id_declarator (tree ident
)
7102 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
7104 ret
->declarator
= 0;
7106 /* Default value - may get reset to a more precise location. */
7107 ret
->id_loc
= input_location
;
7111 /* Return something to represent absolute declarators containing a *.
7112 TARGET is the absolute declarator that the * contains.
7113 TYPE_QUALS_ATTRS is a structure for type qualifiers and attributes
7114 to apply to the pointer type. */
7116 struct c_declarator
*
7117 make_pointer_declarator (struct c_declspecs
*type_quals_attrs
,
7118 struct c_declarator
*target
)
7122 struct c_declarator
*itarget
= target
;
7123 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
7124 if (type_quals_attrs
)
7126 attrs
= type_quals_attrs
->attrs
;
7127 quals
= quals_from_declspecs (type_quals_attrs
);
7128 if (attrs
!= NULL_TREE
)
7129 itarget
= build_attrs_declarator (attrs
, target
);
7131 ret
->kind
= cdk_pointer
;
7132 ret
->declarator
= itarget
;
7133 ret
->u
.pointer_quals
= quals
;
7137 /* Return a pointer to a structure for an empty list of declaration
7140 struct c_declspecs
*
7141 build_null_declspecs (void)
7143 struct c_declspecs
*ret
= XOBNEW (&parser_obstack
, struct c_declspecs
);
7147 ret
->typespec_word
= cts_none
;
7148 ret
->storage_class
= csc_none
;
7149 ret
->declspecs_seen_p
= false;
7150 ret
->type_seen_p
= false;
7151 ret
->non_sc_seen_p
= false;
7152 ret
->typedef_p
= false;
7153 ret
->tag_defined_p
= false;
7154 ret
->explicit_signed_p
= false;
7155 ret
->deprecated_p
= false;
7156 ret
->default_int_p
= false;
7157 ret
->long_p
= false;
7158 ret
->long_long_p
= false;
7159 ret
->short_p
= false;
7160 ret
->signed_p
= false;
7161 ret
->unsigned_p
= false;
7162 ret
->complex_p
= false;
7163 ret
->inline_p
= false;
7164 ret
->thread_p
= false;
7165 ret
->const_p
= false;
7166 ret
->volatile_p
= false;
7167 ret
->restrict_p
= false;
7171 /* Add the type qualifier QUAL to the declaration specifiers SPECS,
7174 struct c_declspecs
*
7175 declspecs_add_qual (struct c_declspecs
*specs
, tree qual
)
7179 specs
->non_sc_seen_p
= true;
7180 specs
->declspecs_seen_p
= true;
7181 gcc_assert (TREE_CODE (qual
) == IDENTIFIER_NODE
7182 && C_IS_RESERVED_WORD (qual
));
7183 i
= C_RID_CODE (qual
);
7187 dupe
= specs
->const_p
;
7188 specs
->const_p
= true;
7191 dupe
= specs
->volatile_p
;
7192 specs
->volatile_p
= true;
7195 dupe
= specs
->restrict_p
;
7196 specs
->restrict_p
= true;
7201 if (dupe
&& pedantic
&& !flag_isoc99
)
7202 pedwarn ("duplicate %qE", qual
);
7206 /* Add the type specifier TYPE to the declaration specifiers SPECS,
7209 struct c_declspecs
*
7210 declspecs_add_type (struct c_declspecs
*specs
, struct c_typespec spec
)
7212 tree type
= spec
.spec
;
7213 specs
->non_sc_seen_p
= true;
7214 specs
->declspecs_seen_p
= true;
7215 specs
->type_seen_p
= true;
7216 if (TREE_DEPRECATED (type
))
7217 specs
->deprecated_p
= true;
7219 /* Handle type specifier keywords. */
7220 if (TREE_CODE (type
) == IDENTIFIER_NODE
&& C_IS_RESERVED_WORD (type
))
7222 enum rid i
= C_RID_CODE (type
);
7225 error ("two or more data types in declaration specifiers");
7228 if ((int) i
<= (int) RID_LAST_MODIFIER
)
7230 /* "long", "short", "signed", "unsigned" or "_Complex". */
7235 if (specs
->long_long_p
)
7237 error ("%<long long long%> is too long for GCC");
7242 if (specs
->typespec_word
== cts_double
)
7244 error ("both %<long long%> and %<double%> in "
7245 "declaration specifiers");
7248 if (pedantic
&& !flag_isoc99
&& !in_system_header
7250 pedwarn ("ISO C90 does not support %<long long%>");
7251 specs
->long_long_p
= 1;
7255 error ("both %<long%> and %<short%> in "
7256 "declaration specifiers");
7257 else if (specs
->typespec_word
== cts_void
)
7258 error ("both %<long%> and %<void%> in "
7259 "declaration specifiers");
7260 else if (specs
->typespec_word
== cts_bool
)
7261 error ("both %<long%> and %<_Bool%> in "
7262 "declaration specifiers");
7263 else if (specs
->typespec_word
== cts_char
)
7264 error ("both %<long%> and %<char%> in "
7265 "declaration specifiers");
7266 else if (specs
->typespec_word
== cts_float
)
7267 error ("both %<long%> and %<float%> in "
7268 "declaration specifiers");
7269 else if (specs
->typespec_word
== cts_dfloat32
)
7270 error ("both %<long%> and %<_Decimal32%> in "
7271 "declaration specifiers");
7272 else if (specs
->typespec_word
== cts_dfloat64
)
7273 error ("both %<long%> and %<_Decimal64%> in "
7274 "declaration specifiers");
7275 else if (specs
->typespec_word
== cts_dfloat128
)
7276 error ("both %<long%> and %<_Decimal128%> in "
7277 "declaration specifiers");
7279 specs
->long_p
= true;
7282 dupe
= specs
->short_p
;
7284 error ("both %<long%> and %<short%> in "
7285 "declaration specifiers");
7286 else if (specs
->typespec_word
== cts_void
)
7287 error ("both %<short%> and %<void%> in "
7288 "declaration specifiers");
7289 else if (specs
->typespec_word
== cts_bool
)
7290 error ("both %<short%> and %<_Bool%> in "
7291 "declaration specifiers");
7292 else if (specs
->typespec_word
== cts_char
)
7293 error ("both %<short%> and %<char%> in "
7294 "declaration specifiers");
7295 else if (specs
->typespec_word
== cts_float
)
7296 error ("both %<short%> and %<float%> in "
7297 "declaration specifiers");
7298 else if (specs
->typespec_word
== cts_double
)
7299 error ("both %<short%> and %<double%> in "
7300 "declaration specifiers");
7301 else if (specs
->typespec_word
== cts_dfloat32
)
7302 error ("both %<short%> and %<_Decimal32%> in "
7303 "declaration specifiers");
7304 else if (specs
->typespec_word
== cts_dfloat64
)
7305 error ("both %<short%> and %<_Decimal64%> in "
7306 "declaration specifiers");
7307 else if (specs
->typespec_word
== cts_dfloat128
)
7308 error ("both %<short%> and %<_Decimal128%> in "
7309 "declaration specifiers");
7311 specs
->short_p
= true;
7314 dupe
= specs
->signed_p
;
7315 if (specs
->unsigned_p
)
7316 error ("both %<signed%> and %<unsigned%> in "
7317 "declaration specifiers");
7318 else if (specs
->typespec_word
== cts_void
)
7319 error ("both %<signed%> and %<void%> in "
7320 "declaration specifiers");
7321 else if (specs
->typespec_word
== cts_bool
)
7322 error ("both %<signed%> and %<_Bool%> in "
7323 "declaration specifiers");
7324 else if (specs
->typespec_word
== cts_float
)
7325 error ("both %<signed%> and %<float%> in "
7326 "declaration specifiers");
7327 else if (specs
->typespec_word
== cts_double
)
7328 error ("both %<signed%> and %<double%> in "
7329 "declaration specifiers");
7330 else if (specs
->typespec_word
== cts_dfloat32
)
7331 error ("both %<signed%> and %<_Decimal32%> in "
7332 "declaration specifiers");
7333 else if (specs
->typespec_word
== cts_dfloat64
)
7334 error ("both %<signed%> and %<_Decimal64%> in "
7335 "declaration specifiers");
7336 else if (specs
->typespec_word
== cts_dfloat128
)
7337 error ("both %<signed%> and %<_Decimal128%> in "
7338 "declaration specifiers");
7340 specs
->signed_p
= true;
7343 dupe
= specs
->unsigned_p
;
7344 if (specs
->signed_p
)
7345 error ("both %<signed%> and %<unsigned%> in "
7346 "declaration specifiers");
7347 else if (specs
->typespec_word
== cts_void
)
7348 error ("both %<unsigned%> and %<void%> in "
7349 "declaration specifiers");
7350 else if (specs
->typespec_word
== cts_bool
)
7351 error ("both %<unsigned%> and %<_Bool%> in "
7352 "declaration specifiers");
7353 else if (specs
->typespec_word
== cts_float
)
7354 error ("both %<unsigned%> and %<float%> in "
7355 "declaration specifiers");
7356 else if (specs
->typespec_word
== cts_double
)
7357 error ("both %<unsigned%> and %<double%> in "
7358 "declaration specifiers");
7359 else if (specs
->typespec_word
== cts_dfloat32
)
7360 error ("both %<unsigned%> and %<_Decimal32%> in "
7361 "declaration specifiers");
7362 else if (specs
->typespec_word
== cts_dfloat64
)
7363 error ("both %<unsigned%> and %<_Decimal64%> in "
7364 "declaration specifiers");
7365 else if (specs
->typespec_word
== cts_dfloat128
)
7366 error ("both %<unsigned%> and %<_Decimal128%> in "
7367 "declaration specifiers");
7369 specs
->unsigned_p
= true;
7372 dupe
= specs
->complex_p
;
7373 if (pedantic
&& !flag_isoc99
&& !in_system_header
)
7374 pedwarn ("ISO C90 does not support complex types");
7375 if (specs
->typespec_word
== cts_void
)
7376 error ("both %<complex%> and %<void%> in "
7377 "declaration specifiers");
7378 else if (specs
->typespec_word
== cts_bool
)
7379 error ("both %<complex%> and %<_Bool%> in "
7380 "declaration specifiers");
7381 else if (specs
->typespec_word
== cts_dfloat32
)
7382 error ("both %<complex%> and %<_Decimal32%> in "
7383 "declaration specifiers");
7384 else if (specs
->typespec_word
== cts_dfloat64
)
7385 error ("both %<complex%> and %<_Decimal64%> in "
7386 "declaration specifiers");
7387 else if (specs
->typespec_word
== cts_dfloat128
)
7388 error ("both %<complex%> and %<_Decimal128%> in "
7389 "declaration specifiers");
7391 specs
->complex_p
= true;
7398 error ("duplicate %qE", type
);
7404 /* "void", "_Bool", "char", "int", "float" or "double". */
7405 if (specs
->typespec_word
!= cts_none
)
7407 error ("two or more data types in declaration specifiers");
7414 error ("both %<long%> and %<void%> in "
7415 "declaration specifiers");
7416 else if (specs
->short_p
)
7417 error ("both %<short%> and %<void%> in "
7418 "declaration specifiers");
7419 else if (specs
->signed_p
)
7420 error ("both %<signed%> and %<void%> in "
7421 "declaration specifiers");
7422 else if (specs
->unsigned_p
)
7423 error ("both %<unsigned%> and %<void%> in "
7424 "declaration specifiers");
7425 else if (specs
->complex_p
)
7426 error ("both %<complex%> and %<void%> in "
7427 "declaration specifiers");
7429 specs
->typespec_word
= cts_void
;
7433 error ("both %<long%> and %<_Bool%> in "
7434 "declaration specifiers");
7435 else if (specs
->short_p
)
7436 error ("both %<short%> and %<_Bool%> in "
7437 "declaration specifiers");
7438 else if (specs
->signed_p
)
7439 error ("both %<signed%> and %<_Bool%> in "
7440 "declaration specifiers");
7441 else if (specs
->unsigned_p
)
7442 error ("both %<unsigned%> and %<_Bool%> in "
7443 "declaration specifiers");
7444 else if (specs
->complex_p
)
7445 error ("both %<complex%> and %<_Bool%> in "
7446 "declaration specifiers");
7448 specs
->typespec_word
= cts_bool
;
7452 error ("both %<long%> and %<char%> in "
7453 "declaration specifiers");
7454 else if (specs
->short_p
)
7455 error ("both %<short%> and %<char%> in "
7456 "declaration specifiers");
7458 specs
->typespec_word
= cts_char
;
7461 specs
->typespec_word
= cts_int
;
7465 error ("both %<long%> and %<float%> in "
7466 "declaration specifiers");
7467 else if (specs
->short_p
)
7468 error ("both %<short%> and %<float%> in "
7469 "declaration specifiers");
7470 else if (specs
->signed_p
)
7471 error ("both %<signed%> and %<float%> in "
7472 "declaration specifiers");
7473 else if (specs
->unsigned_p
)
7474 error ("both %<unsigned%> and %<float%> in "
7475 "declaration specifiers");
7477 specs
->typespec_word
= cts_float
;
7480 if (specs
->long_long_p
)
7481 error ("both %<long long%> and %<double%> in "
7482 "declaration specifiers");
7483 else if (specs
->short_p
)
7484 error ("both %<short%> and %<double%> in "
7485 "declaration specifiers");
7486 else if (specs
->signed_p
)
7487 error ("both %<signed%> and %<double%> in "
7488 "declaration specifiers");
7489 else if (specs
->unsigned_p
)
7490 error ("both %<unsigned%> and %<double%> in "
7491 "declaration specifiers");
7493 specs
->typespec_word
= cts_double
;
7500 if (i
== RID_DFLOAT32
)
7502 else if (i
== RID_DFLOAT64
)
7505 str
= "_Decimal128";
7506 if (specs
->long_long_p
)
7507 error ("both %<long long%> and %<%s%> in "
7508 "declaration specifiers", str
);
7510 error ("both %<long%> and %<%s%> in "
7511 "declaration specifiers", str
);
7512 else if (specs
->short_p
)
7513 error ("both %<short%> and %<%s%> in "
7514 "declaration specifiers", str
);
7515 else if (specs
->signed_p
)
7516 error ("both %<signed%> and %<%s%> in "
7517 "declaration specifiers", str
);
7518 else if (specs
->unsigned_p
)
7519 error ("both %<unsigned%> and %<%s%> in "
7520 "declaration specifiers", str
);
7521 else if (specs
->complex_p
)
7522 error ("both %<complex%> and %<%s%> in "
7523 "declaration specifiers", str
);
7524 else if (i
== RID_DFLOAT32
)
7525 specs
->typespec_word
= cts_dfloat32
;
7526 else if (i
== RID_DFLOAT64
)
7527 specs
->typespec_word
= cts_dfloat64
;
7529 specs
->typespec_word
= cts_dfloat128
;
7531 if (!targetm
.decimal_float_supported_p ())
7532 error ("decimal floating point not supported for this target");
7534 pedwarn ("ISO C does not support decimal floating point");
7537 /* ObjC reserved word "id", handled below. */
7543 /* Now we have a typedef (a TYPE_DECL node), an identifier (some
7544 form of ObjC type, cases such as "int" and "long" being handled
7545 above), a TYPE (struct, union, enum and typeof specifiers) or an
7546 ERROR_MARK. In none of these cases may there have previously
7547 been any type specifiers. */
7548 if (specs
->type
|| specs
->typespec_word
!= cts_none
7549 || specs
->long_p
|| specs
->short_p
|| specs
->signed_p
7550 || specs
->unsigned_p
|| specs
->complex_p
)
7551 error ("two or more data types in declaration specifiers");
7552 else if (TREE_CODE (type
) == TYPE_DECL
)
7554 if (TREE_TYPE (type
) == error_mark_node
)
7555 ; /* Allow the type to default to int to avoid cascading errors. */
7558 specs
->type
= TREE_TYPE (type
);
7559 specs
->decl_attr
= DECL_ATTRIBUTES (type
);
7560 specs
->typedef_p
= true;
7561 specs
->explicit_signed_p
= C_TYPEDEF_EXPLICITLY_SIGNED (type
);
7564 else if (TREE_CODE (type
) == IDENTIFIER_NODE
)
7566 tree t
= lookup_name (type
);
7567 if (!t
|| TREE_CODE (t
) != TYPE_DECL
)
7568 error ("%qE fails to be a typedef or built in type", type
);
7569 else if (TREE_TYPE (t
) == error_mark_node
)
7572 specs
->type
= TREE_TYPE (t
);
7574 else if (TREE_CODE (type
) != ERROR_MARK
)
7576 if (spec
.kind
== ctsk_tagdef
|| spec
.kind
== ctsk_tagfirstref
)
7577 specs
->tag_defined_p
= true;
7578 if (spec
.kind
== ctsk_typeof
)
7579 specs
->typedef_p
= true;
7586 /* Add the storage class specifier or function specifier SCSPEC to the
7587 declaration specifiers SPECS, returning SPECS. */
7589 struct c_declspecs
*
7590 declspecs_add_scspec (struct c_declspecs
*specs
, tree scspec
)
7593 enum c_storage_class n
= csc_none
;
7595 specs
->declspecs_seen_p
= true;
7596 gcc_assert (TREE_CODE (scspec
) == IDENTIFIER_NODE
7597 && C_IS_RESERVED_WORD (scspec
));
7598 i
= C_RID_CODE (scspec
);
7599 if (specs
->non_sc_seen_p
)
7600 warning (OPT_Wold_style_declaration
,
7601 "%qE is not at beginning of declaration", scspec
);
7605 /* C99 permits duplicate inline. Although of doubtful utility,
7606 it seems simplest to permit it in gnu89 mode as well, as
7607 there is also little utility in maintaining this as a
7608 difference between gnu89 and C99 inline. */
7610 specs
->inline_p
= true;
7613 dupe
= specs
->thread_p
;
7614 if (specs
->storage_class
== csc_auto
)
7615 error ("%<__thread%> used with %<auto%>");
7616 else if (specs
->storage_class
== csc_register
)
7617 error ("%<__thread%> used with %<register%>");
7618 else if (specs
->storage_class
== csc_typedef
)
7619 error ("%<__thread%> used with %<typedef%>");
7621 specs
->thread_p
= true;
7628 /* Diagnose "__thread extern". */
7629 if (specs
->thread_p
)
7630 error ("%<__thread%> before %<extern%>");
7637 /* Diagnose "__thread static". */
7638 if (specs
->thread_p
)
7639 error ("%<__thread%> before %<static%>");
7647 if (n
!= csc_none
&& n
== specs
->storage_class
)
7650 error ("duplicate %qE", scspec
);
7653 if (specs
->storage_class
!= csc_none
&& n
!= specs
->storage_class
)
7655 error ("multiple storage classes in declaration specifiers");
7659 specs
->storage_class
= n
;
7660 if (n
!= csc_extern
&& n
!= csc_static
&& specs
->thread_p
)
7662 error ("%<__thread%> used with %qE", scspec
);
7663 specs
->thread_p
= false;
7670 /* Add the attributes ATTRS to the declaration specifiers SPECS,
7673 struct c_declspecs
*
7674 declspecs_add_attrs (struct c_declspecs
*specs
, tree attrs
)
7676 specs
->attrs
= chainon (attrs
, specs
->attrs
);
7677 specs
->declspecs_seen_p
= true;
7681 /* Combine "long", "short", "signed", "unsigned" and "_Complex" type
7682 specifiers with any other type specifier to determine the resulting
7683 type. This is where ISO C checks on complex types are made, since
7684 "_Complex long" is a prefix of the valid ISO C type "_Complex long
7687 struct c_declspecs
*
7688 finish_declspecs (struct c_declspecs
*specs
)
7690 /* If a type was specified as a whole, we have no modifiers and are
7692 if (specs
->type
!= NULL_TREE
)
7694 gcc_assert (!specs
->long_p
&& !specs
->long_long_p
&& !specs
->short_p
7695 && !specs
->signed_p
&& !specs
->unsigned_p
7696 && !specs
->complex_p
);
7700 /* If none of "void", "_Bool", "char", "int", "float" or "double"
7701 has been specified, treat it as "int" unless "_Complex" is
7702 present and there are no other specifiers. If we just have
7703 "_Complex", it is equivalent to "_Complex double", but e.g.
7704 "_Complex short" is equivalent to "_Complex short int". */
7705 if (specs
->typespec_word
== cts_none
)
7707 if (specs
->long_p
|| specs
->short_p
7708 || specs
->signed_p
|| specs
->unsigned_p
)
7710 specs
->typespec_word
= cts_int
;
7712 else if (specs
->complex_p
)
7714 specs
->typespec_word
= cts_double
;
7716 pedwarn ("ISO C does not support plain %<complex%> meaning "
7717 "%<double complex%>");
7721 specs
->typespec_word
= cts_int
;
7722 specs
->default_int_p
= true;
7723 /* We don't diagnose this here because grokdeclarator will
7724 give more specific diagnostics according to whether it is
7725 a function definition. */
7729 /* If "signed" was specified, record this to distinguish "int" and
7730 "signed int" in the case of a bit-field with
7731 -funsigned-bitfields. */
7732 specs
->explicit_signed_p
= specs
->signed_p
;
7734 /* Now compute the actual type. */
7735 switch (specs
->typespec_word
)
7738 gcc_assert (!specs
->long_p
&& !specs
->short_p
7739 && !specs
->signed_p
&& !specs
->unsigned_p
7740 && !specs
->complex_p
);
7741 specs
->type
= void_type_node
;
7744 gcc_assert (!specs
->long_p
&& !specs
->short_p
7745 && !specs
->signed_p
&& !specs
->unsigned_p
7746 && !specs
->complex_p
);
7747 specs
->type
= boolean_type_node
;
7750 gcc_assert (!specs
->long_p
&& !specs
->short_p
);
7751 gcc_assert (!(specs
->signed_p
&& specs
->unsigned_p
));
7752 if (specs
->signed_p
)
7753 specs
->type
= signed_char_type_node
;
7754 else if (specs
->unsigned_p
)
7755 specs
->type
= unsigned_char_type_node
;
7757 specs
->type
= char_type_node
;
7758 if (specs
->complex_p
)
7761 pedwarn ("ISO C does not support complex integer types");
7762 specs
->type
= build_complex_type (specs
->type
);
7766 gcc_assert (!(specs
->long_p
&& specs
->short_p
));
7767 gcc_assert (!(specs
->signed_p
&& specs
->unsigned_p
));
7768 if (specs
->long_long_p
)
7769 specs
->type
= (specs
->unsigned_p
7770 ? long_long_unsigned_type_node
7771 : long_long_integer_type_node
);
7772 else if (specs
->long_p
)
7773 specs
->type
= (specs
->unsigned_p
7774 ? long_unsigned_type_node
7775 : long_integer_type_node
);
7776 else if (specs
->short_p
)
7777 specs
->type
= (specs
->unsigned_p
7778 ? short_unsigned_type_node
7779 : short_integer_type_node
);
7781 specs
->type
= (specs
->unsigned_p
7782 ? unsigned_type_node
7783 : integer_type_node
);
7784 if (specs
->complex_p
)
7787 pedwarn ("ISO C does not support complex integer types");
7788 specs
->type
= build_complex_type (specs
->type
);
7792 gcc_assert (!specs
->long_p
&& !specs
->short_p
7793 && !specs
->signed_p
&& !specs
->unsigned_p
);
7794 specs
->type
= (specs
->complex_p
7795 ? complex_float_type_node
7799 gcc_assert (!specs
->long_long_p
&& !specs
->short_p
7800 && !specs
->signed_p
&& !specs
->unsigned_p
);
7803 specs
->type
= (specs
->complex_p
7804 ? complex_long_double_type_node
7805 : long_double_type_node
);
7809 specs
->type
= (specs
->complex_p
7810 ? complex_double_type_node
7811 : double_type_node
);
7817 gcc_assert (!specs
->long_p
&& !specs
->long_long_p
&& !specs
->short_p
7818 && !specs
->signed_p
&& !specs
->unsigned_p
&& !specs
->complex_p
);
7819 if (specs
->typespec_word
== cts_dfloat32
)
7820 specs
->type
= dfloat32_type_node
;
7821 else if (specs
->typespec_word
== cts_dfloat64
)
7822 specs
->type
= dfloat64_type_node
;
7824 specs
->type
= dfloat128_type_node
;
7833 /* A subroutine of c_write_global_declarations. Perform final processing
7834 on one file scope's declarations (or the external scope's declarations),
7838 c_write_global_declarations_1 (tree globals
)
7843 /* Process the decls in the order they were written. */
7844 for (decl
= globals
; decl
; decl
= TREE_CHAIN (decl
))
7846 /* Check for used but undefined static functions using the C
7847 standard's definition of "used", and set TREE_NO_WARNING so
7848 that check_global_declarations doesn't repeat the check. */
7849 if (TREE_CODE (decl
) == FUNCTION_DECL
7850 && DECL_INITIAL (decl
) == 0
7851 && DECL_EXTERNAL (decl
)
7852 && !TREE_PUBLIC (decl
)
7853 && C_DECL_USED (decl
))
7855 pedwarn ("%q+F used but never defined", decl
);
7856 TREE_NO_WARNING (decl
) = 1;
7859 wrapup_global_declaration_1 (decl
);
7865 for (decl
= globals
; decl
; decl
= TREE_CHAIN (decl
))
7866 reconsider
|= wrapup_global_declaration_2 (decl
);
7870 for (decl
= globals
; decl
; decl
= TREE_CHAIN (decl
))
7871 check_global_declaration_1 (decl
);
7874 /* A subroutine of c_write_global_declarations Emit debug information for each
7875 of the declarations in GLOBALS. */
7878 c_write_global_declarations_2 (tree globals
)
7882 for (decl
= globals
; decl
; decl
= TREE_CHAIN (decl
))
7883 debug_hooks
->global_decl (decl
);
7886 /* Preserve the external declarations scope across a garbage collect. */
7887 static GTY(()) tree ext_block
;
7890 c_write_global_declarations (void)
7894 /* We don't want to do this if generating a PCH. */
7898 /* Don't waste time on further processing if -fsyntax-only or we've
7899 encountered errors. */
7900 if (flag_syntax_only
|| errorcount
|| sorrycount
|| cpp_errors (parse_in
))
7903 /* Close the external scope. */
7904 ext_block
= pop_scope ();
7906 gcc_assert (!current_scope
);
7910 tree tmp
= BLOCK_VARS (ext_block
);
7912 FILE * stream
= dump_begin (TDI_tu
, &flags
);
7915 dump_node (tmp
, flags
& ~TDF_SLIM
, stream
);
7916 dump_end (TDI_tu
, stream
);
7920 /* Process all file scopes in this compilation, and the external_scope,
7921 through wrapup_global_declarations and check_global_declarations. */
7922 for (t
= all_translation_units
; t
; t
= TREE_CHAIN (t
))
7923 c_write_global_declarations_1 (BLOCK_VARS (DECL_INITIAL (t
)));
7924 c_write_global_declarations_1 (BLOCK_VARS (ext_block
));
7926 /* Call functions declared with the "constructor" or "destructor"
7928 c_build_cdtor_fns ();
7930 /* We're done parsing; proceed to optimize and emit assembly.
7931 FIXME: shouldn't be the front end's responsibility to call this. */
7934 /* After cgraph has had a chance to emit everything that's going to
7935 be emitted, output debug information for globals. */
7936 if (errorcount
== 0 && sorrycount
== 0)
7938 timevar_push (TV_SYMOUT
);
7939 for (t
= all_translation_units
; t
; t
= TREE_CHAIN (t
))
7940 c_write_global_declarations_2 (BLOCK_VARS (DECL_INITIAL (t
)));
7941 c_write_global_declarations_2 (BLOCK_VARS (ext_block
));
7942 timevar_pop (TV_SYMOUT
);
7948 #include "gt-c-decl.h"