1 /* Process declarations and variables for C compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
3 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
4 Free Software Foundation, Inc.
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it under
9 the terms of the GNU General Public License as published by the Free
10 Software Foundation; either version 3, or (at your option) any later
13 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
14 WARRANTY; without even the implied warranty of MERCHANTABILITY or
15 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
22 /* Process declarations and symbol lookup for C front end.
23 Also constructs types; the standard scalar types at initialization,
24 and structure, union, array and enum types when they are declared. */
26 /* ??? not all decl nodes are given the most useful possible
27 line numbers. For example, the CONST_DECLs for enum values. */
31 #include "coretypes.h"
36 #include "tree-inline.h"
53 #include "langhooks.h"
54 #include "tree-mudflap.h"
56 #include "tree-iterator.h"
57 #include "diagnostic.h"
58 #include "tree-dump.h"
63 #include "langhooks-def.h"
64 #include "pointer-set.h"
68 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
70 { NORMAL
, /* Ordinary declaration */
71 FUNCDEF
, /* Function definition */
72 PARM
, /* Declaration of parm before function body */
73 FIELD
, /* Declaration inside struct or union */
74 TYPENAME
}; /* Typename (inside cast or sizeof) */
76 /* States indicating how grokdeclarator() should handle declspecs marked
77 with __attribute__((deprecated)). An object declared as
78 __attribute__((deprecated)) suppresses warnings of uses of other
81 enum deprecated_states
{
87 /* Nonzero if we have seen an invalid cross reference
88 to a struct, union, or enum, but not yet printed the message. */
89 tree pending_invalid_xref
;
91 /* File and line to appear in the eventual error message. */
92 location_t pending_invalid_xref_location
;
94 /* True means we've initialized exception handling. */
95 bool c_eh_initialized_p
;
97 /* The file and line that the prototype came from if this is an
98 old-style definition; used for diagnostics in
99 store_parm_decls_oldstyle. */
101 static location_t current_function_prototype_locus
;
103 /* Whether this prototype was built-in. */
105 static bool current_function_prototype_built_in
;
107 /* The argument type information of this prototype. */
109 static tree current_function_prototype_arg_types
;
111 /* The argument information structure for the function currently being
114 static struct c_arg_info
*current_function_arg_info
;
116 /* The obstack on which parser and related data structures, which are
117 not live beyond their top-level declaration or definition, are
119 struct obstack parser_obstack
;
121 /* The current statement tree. */
123 static GTY(()) struct stmt_tree_s c_stmt_tree
;
125 /* State saving variables. */
129 /* Linked list of TRANSLATION_UNIT_DECLS for the translation units
130 included in this invocation. Note that the current translation
131 unit is not included in this list. */
133 static GTY(()) tree all_translation_units
;
135 /* A list of decls to be made automatically visible in each file scope. */
136 static GTY(()) tree visible_builtins
;
138 /* Set to 0 at beginning of a function definition, set to 1 if
139 a return statement that specifies a return value is seen. */
141 int current_function_returns_value
;
143 /* Set to 0 at beginning of a function definition, set to 1 if
144 a return statement with no argument is seen. */
146 int current_function_returns_null
;
148 /* Set to 0 at beginning of a function definition, set to 1 if
149 a call to a noreturn function is seen. */
151 int current_function_returns_abnormally
;
153 /* Set to nonzero by `grokdeclarator' for a function
154 whose return type is defaulted, if warnings for this are desired. */
156 static int warn_about_return_type
;
158 /* Nonzero when the current toplevel function contains a declaration
159 of a nested function which is never defined. */
161 static bool undef_nested_function
;
163 /* True means global_bindings_p should return false even if the scope stack
164 says we are in file scope. */
165 bool c_override_global_bindings_to_false
;
168 /* Each c_binding structure describes one binding of an identifier to
169 a decl. All the decls in a scope - irrespective of namespace - are
170 chained together by the ->prev field, which (as the name implies)
171 runs in reverse order. All the decls in a given namespace bound to
172 a given identifier are chained by the ->shadowed field, which runs
173 from inner to outer scopes.
175 The ->decl field usually points to a DECL node, but there are two
176 exceptions. In the namespace of type tags, the bound entity is a
177 RECORD_TYPE, UNION_TYPE, or ENUMERAL_TYPE node. If an undeclared
178 identifier is encountered, it is bound to error_mark_node to
179 suppress further errors about that identifier in the current
182 The ->type field stores the type of the declaration in this scope;
183 if NULL, the type is the type of the ->decl field. This is only of
184 relevance for objects with external or internal linkage which may
185 be redeclared in inner scopes, forming composite types that only
186 persist for the duration of those scopes. In the external scope,
187 this stores the composite of all the types declared for this
188 object, visible or not. The ->inner_comp field (used only at file
189 scope) stores whether an incomplete array type at file scope was
190 completed at an inner scope to an array size other than 1.
192 The depth field is copied from the scope structure that holds this
193 decl. It is used to preserve the proper ordering of the ->shadowed
194 field (see bind()) and also for a handful of special-case checks.
195 Finally, the invisible bit is true for a decl which should be
196 ignored for purposes of normal name lookup, and the nested bit is
197 true for a decl that's been bound a second time in an inner scope;
198 in all such cases, the binding in the outer scope will have its
199 invisible bit true. */
201 struct c_binding
GTY((chain_next ("%h.prev")))
203 tree decl
; /* the decl bound */
204 tree type
; /* the type in this scope */
205 tree id
; /* the identifier it's bound to */
206 struct c_binding
*prev
; /* the previous decl in this scope */
207 struct c_binding
*shadowed
; /* the innermost decl shadowed by this one */
208 unsigned int depth
: 28; /* depth of this scope */
209 BOOL_BITFIELD invisible
: 1; /* normal lookup should ignore this binding */
210 BOOL_BITFIELD nested
: 1; /* do not set DECL_CONTEXT when popping */
211 BOOL_BITFIELD inner_comp
: 1; /* incomplete array completed in inner scope */
213 location_t locus
; /* location for nested bindings */
215 #define B_IN_SCOPE(b1, b2) ((b1)->depth == (b2)->depth)
216 #define B_IN_CURRENT_SCOPE(b) ((b)->depth == current_scope->depth)
217 #define B_IN_FILE_SCOPE(b) ((b)->depth == 1 /*file_scope->depth*/)
218 #define B_IN_EXTERNAL_SCOPE(b) ((b)->depth == 0 /*external_scope->depth*/)
220 #define I_SYMBOL_BINDING(node) \
221 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->symbol_binding)
222 #define I_SYMBOL_DECL(node) \
223 (I_SYMBOL_BINDING(node) ? I_SYMBOL_BINDING(node)->decl : 0)
225 #define I_TAG_BINDING(node) \
226 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->tag_binding)
227 #define I_TAG_DECL(node) \
228 (I_TAG_BINDING(node) ? I_TAG_BINDING(node)->decl : 0)
230 #define I_LABEL_BINDING(node) \
231 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->label_binding)
232 #define I_LABEL_DECL(node) \
233 (I_LABEL_BINDING(node) ? I_LABEL_BINDING(node)->decl : 0)
235 /* Each C symbol points to three linked lists of c_binding structures.
236 These describe the values of the identifier in the three different
237 namespaces defined by the language. */
239 struct lang_identifier
GTY(())
241 struct c_common_identifier common_id
;
242 struct c_binding
*symbol_binding
; /* vars, funcs, constants, typedefs */
243 struct c_binding
*tag_binding
; /* struct/union/enum tags */
244 struct c_binding
*label_binding
; /* labels */
247 /* Validate c-lang.c's assumptions. */
248 extern char C_SIZEOF_STRUCT_LANG_IDENTIFIER_isnt_accurate
249 [(sizeof(struct lang_identifier
) == C_SIZEOF_STRUCT_LANG_IDENTIFIER
) ? 1 : -1];
251 /* The resulting tree type. */
254 GTY((desc ("TREE_CODE (&%h.generic) == IDENTIFIER_NODE"),
255 chain_next ("TREE_CODE (&%h.generic) == INTEGER_TYPE ? (union lang_tree_node *) TYPE_NEXT_VARIANT (&%h.generic) : ((union lang_tree_node *) TREE_CHAIN (&%h.generic))")))
257 union tree_node
GTY ((tag ("0"),
258 desc ("tree_node_structure (&%h)")))
260 struct lang_identifier
GTY ((tag ("1"))) identifier
;
263 /* Each c_scope structure describes the complete contents of one
264 scope. Four scopes are distinguished specially: the innermost or
265 current scope, the innermost function scope, the file scope (always
266 the second to outermost) and the outermost or external scope.
268 Most declarations are recorded in the current scope.
270 All normal label declarations are recorded in the innermost
271 function scope, as are bindings of undeclared identifiers to
272 error_mark_node. (GCC permits nested functions as an extension,
273 hence the 'innermost' qualifier.) Explicitly declared labels
274 (using the __label__ extension) appear in the current scope.
276 Being in the file scope (current_scope == file_scope) causes
277 special behavior in several places below. Also, under some
278 conditions the Objective-C front end records declarations in the
279 file scope even though that isn't the current scope.
281 All declarations with external linkage are recorded in the external
282 scope, even if they aren't visible there; this models the fact that
283 such declarations are visible to the entire program, and (with a
284 bit of cleverness, see pushdecl) allows diagnosis of some violations
285 of C99 6.2.2p7 and 6.2.7p2:
287 If, within the same translation unit, the same identifier appears
288 with both internal and external linkage, the behavior is
291 All declarations that refer to the same object or function shall
292 have compatible type; otherwise, the behavior is undefined.
294 Initially only the built-in declarations, which describe compiler
295 intrinsic functions plus a subset of the standard library, are in
298 The order of the blocks list matters, and it is frequently appended
299 to. To avoid having to walk all the way to the end of the list on
300 each insertion, or reverse the list later, we maintain a pointer to
301 the last list entry. (FIXME: It should be feasible to use a reversed
304 The bindings list is strictly in reverse order of declarations;
305 pop_scope relies on this. */
308 struct c_scope
GTY((chain_next ("%h.outer")))
310 /* The scope containing this one. */
311 struct c_scope
*outer
;
313 /* The next outermost function scope. */
314 struct c_scope
*outer_function
;
316 /* All bindings in this scope. */
317 struct c_binding
*bindings
;
319 /* For each scope (except the global one), a chain of BLOCK nodes
320 for all the scopes that were entered and exited one level down. */
324 /* The depth of this scope. Used to keep the ->shadowed chain of
325 bindings sorted innermost to outermost. */
326 unsigned int depth
: 28;
328 /* True if we are currently filling this scope with parameter
330 BOOL_BITFIELD parm_flag
: 1;
332 /* True if we saw [*] in this scope. Used to give an error messages
333 if these appears in a function definition. */
334 BOOL_BITFIELD had_vla_unspec
: 1;
336 /* True if we already complained about forward parameter decls
337 in this scope. This prevents double warnings on
338 foo (int a; int b; ...) */
339 BOOL_BITFIELD warned_forward_parm_decls
: 1;
341 /* True if this is the outermost block scope of a function body.
342 This scope contains the parameters, the local variables declared
343 in the outermost block, and all the labels (except those in
344 nested functions, or declared at block scope with __label__). */
345 BOOL_BITFIELD function_body
: 1;
347 /* True means make a BLOCK for this scope no matter what. */
348 BOOL_BITFIELD keep
: 1;
351 /* The scope currently in effect. */
353 static GTY(()) struct c_scope
*current_scope
;
355 /* The innermost function scope. Ordinary (not explicitly declared)
356 labels, bindings to error_mark_node, and the lazily-created
357 bindings of __func__ and its friends get this scope. */
359 static GTY(()) struct c_scope
*current_function_scope
;
361 /* The C file scope. This is reset for each input translation unit. */
363 static GTY(()) struct c_scope
*file_scope
;
365 /* The outermost scope. This is used for all declarations with
366 external linkage, and only these, hence the name. */
368 static GTY(()) struct c_scope
*external_scope
;
370 /* A chain of c_scope structures awaiting reuse. */
372 static GTY((deletable
)) struct c_scope
*scope_freelist
;
374 /* A chain of c_binding structures awaiting reuse. */
376 static GTY((deletable
)) struct c_binding
*binding_freelist
;
378 /* Append VAR to LIST in scope SCOPE. */
379 #define SCOPE_LIST_APPEND(scope, list, decl) do { \
380 struct c_scope *s_ = (scope); \
382 if (s_->list##_last) \
383 BLOCK_CHAIN (s_->list##_last) = d_; \
386 s_->list##_last = d_; \
389 /* Concatenate FROM in scope FSCOPE onto TO in scope TSCOPE. */
390 #define SCOPE_LIST_CONCAT(tscope, to, fscope, from) do { \
391 struct c_scope *t_ = (tscope); \
392 struct c_scope *f_ = (fscope); \
394 BLOCK_CHAIN (t_->to##_last) = f_->from; \
397 t_->to##_last = f_->from##_last; \
400 /* True means unconditionally make a BLOCK for the next scope pushed. */
402 static bool keep_next_level_flag
;
404 /* True means the next call to push_scope will be the outermost scope
405 of a function body, so do not push a new scope, merely cease
406 expecting parameter decls. */
408 static bool next_is_function_body
;
410 /* Forward declarations. */
411 static tree
lookup_name_in_scope (tree
, struct c_scope
*);
412 static tree
c_make_fname_decl (tree
, int);
413 static tree
grokdeclarator (const struct c_declarator
*,
414 struct c_declspecs
*,
415 enum decl_context
, bool, tree
*, tree
*, tree
*,
416 bool *, enum deprecated_states
);
417 static tree
grokparms (struct c_arg_info
*, bool);
418 static void layout_array_type (tree
);
420 /* T is a statement. Add it to the statement-tree. This is the
421 C/ObjC version--C++ has a slightly different version of this
427 enum tree_code code
= TREE_CODE (t
);
429 if (CAN_HAVE_LOCATION_P (t
) && code
!= LABEL_EXPR
)
431 if (!EXPR_HAS_LOCATION (t
))
432 SET_EXPR_LOCATION (t
, input_location
);
435 if (code
== LABEL_EXPR
|| code
== CASE_LABEL_EXPR
)
436 STATEMENT_LIST_HAS_LABEL (cur_stmt_list
) = 1;
438 /* Add T to the statement-tree. Non-side-effect statements need to be
439 recorded during statement expressions. */
440 append_to_statement_list_force (t
, &cur_stmt_list
);
447 c_print_identifier (FILE *file
, tree node
, int indent
)
449 print_node (file
, "symbol", I_SYMBOL_DECL (node
), indent
+ 4);
450 print_node (file
, "tag", I_TAG_DECL (node
), indent
+ 4);
451 print_node (file
, "label", I_LABEL_DECL (node
), indent
+ 4);
452 if (C_IS_RESERVED_WORD (node
) && C_RID_CODE (node
) != RID_CXX_COMPAT_WARN
)
454 tree rid
= ridpointers
[C_RID_CODE (node
)];
455 indent_to (file
, indent
+ 4);
456 fprintf (file
, "rid %p \"%s\"",
457 (void *) rid
, IDENTIFIER_POINTER (rid
));
461 /* Establish a binding between NAME, an IDENTIFIER_NODE, and DECL,
462 which may be any of several kinds of DECL or TYPE or error_mark_node,
463 in the scope SCOPE. */
465 bind (tree name
, tree decl
, struct c_scope
*scope
, bool invisible
,
466 bool nested
, location_t locus
)
468 struct c_binding
*b
, **here
;
470 if (binding_freelist
)
472 b
= binding_freelist
;
473 binding_freelist
= b
->prev
;
476 b
= GGC_NEW (struct c_binding
);
481 b
->depth
= scope
->depth
;
482 b
->invisible
= invisible
;
489 b
->prev
= scope
->bindings
;
495 switch (TREE_CODE (decl
))
497 case LABEL_DECL
: here
= &I_LABEL_BINDING (name
); break;
500 case RECORD_TYPE
: here
= &I_TAG_BINDING (name
); break;
506 case ERROR_MARK
: here
= &I_SYMBOL_BINDING (name
); break;
512 /* Locate the appropriate place in the chain of shadowed decls
513 to insert this binding. Normally, scope == current_scope and
514 this does nothing. */
515 while (*here
&& (*here
)->depth
> scope
->depth
)
516 here
= &(*here
)->shadowed
;
522 /* Clear the binding structure B, stick it on the binding_freelist,
523 and return the former value of b->prev. This is used by pop_scope
524 and get_parm_info to iterate destructively over all the bindings
525 from a given scope. */
526 static struct c_binding
*
527 free_binding_and_advance (struct c_binding
*b
)
529 struct c_binding
*prev
= b
->prev
;
531 memset (b
, 0, sizeof (struct c_binding
));
532 b
->prev
= binding_freelist
;
533 binding_freelist
= b
;
539 /* Hook called at end of compilation to assume 1 elt
540 for a file-scope tentative array defn that wasn't complete before. */
543 c_finish_incomplete_decl (tree decl
)
545 if (TREE_CODE (decl
) == VAR_DECL
)
547 tree type
= TREE_TYPE (decl
);
548 if (type
!= error_mark_node
549 && TREE_CODE (type
) == ARRAY_TYPE
550 && !DECL_EXTERNAL (decl
)
551 && TYPE_DOMAIN (type
) == 0)
553 warning (0, "array %q+D assumed to have one element", decl
);
555 complete_array_type (&TREE_TYPE (decl
), NULL_TREE
, true);
557 layout_decl (decl
, 0);
562 /* The Objective-C front-end often needs to determine the current scope. */
565 objc_get_current_scope (void)
567 return current_scope
;
570 /* The following function is used only by Objective-C. It needs to live here
571 because it accesses the innards of c_scope. */
574 objc_mark_locals_volatile (void *enclosing_blk
)
576 struct c_scope
*scope
;
579 for (scope
= current_scope
;
580 scope
&& scope
!= enclosing_blk
;
581 scope
= scope
->outer
)
583 for (b
= scope
->bindings
; b
; b
= b
->prev
)
584 objc_volatilize_decl (b
->decl
);
586 /* Do not climb up past the current function. */
587 if (scope
->function_body
)
592 /* Nonzero if we are currently in file scope. */
595 global_bindings_p (void)
597 return current_scope
== file_scope
&& !c_override_global_bindings_to_false
;
601 keep_next_level (void)
603 keep_next_level_flag
= true;
606 /* Identify this scope as currently being filled with parameters. */
609 declare_parm_level (void)
611 current_scope
->parm_flag
= true;
617 if (next_is_function_body
)
619 /* This is the transition from the parameters to the top level
620 of the function body. These are the same scope
621 (C99 6.2.1p4,6) so we do not push another scope structure.
622 next_is_function_body is set only by store_parm_decls, which
623 in turn is called when and only when we are about to
624 encounter the opening curly brace for the function body.
626 The outermost block of a function always gets a BLOCK node,
627 because the debugging output routines expect that each
628 function has at least one BLOCK. */
629 current_scope
->parm_flag
= false;
630 current_scope
->function_body
= true;
631 current_scope
->keep
= true;
632 current_scope
->outer_function
= current_function_scope
;
633 current_function_scope
= current_scope
;
635 keep_next_level_flag
= false;
636 next_is_function_body
= false;
640 struct c_scope
*scope
;
643 scope
= scope_freelist
;
644 scope_freelist
= scope
->outer
;
647 scope
= GGC_CNEW (struct c_scope
);
649 scope
->keep
= keep_next_level_flag
;
650 scope
->outer
= current_scope
;
651 scope
->depth
= current_scope
? (current_scope
->depth
+ 1) : 0;
653 /* Check for scope depth overflow. Unlikely (2^28 == 268,435,456) but
655 if (current_scope
&& scope
->depth
== 0)
658 sorry ("GCC supports only %u nested scopes", scope
->depth
);
661 current_scope
= scope
;
662 keep_next_level_flag
= false;
666 /* Set the TYPE_CONTEXT of all of TYPE's variants to CONTEXT. */
669 set_type_context (tree type
, tree context
)
671 for (type
= TYPE_MAIN_VARIANT (type
); type
;
672 type
= TYPE_NEXT_VARIANT (type
))
673 TYPE_CONTEXT (type
) = context
;
676 /* Exit a scope. Restore the state of the identifier-decl mappings
677 that were in effect when this scope was entered. Return a BLOCK
678 node containing all the DECLs in this scope that are of interest
679 to debug info generation. */
684 struct c_scope
*scope
= current_scope
;
685 tree block
, context
, p
;
688 bool functionbody
= scope
->function_body
;
689 bool keep
= functionbody
|| scope
->keep
|| scope
->bindings
;
691 c_end_vm_scope (scope
->depth
);
693 /* If appropriate, create a BLOCK to record the decls for the life
698 block
= make_node (BLOCK
);
699 BLOCK_SUBBLOCKS (block
) = scope
->blocks
;
700 TREE_USED (block
) = 1;
702 /* In each subblock, record that this is its superior. */
703 for (p
= scope
->blocks
; p
; p
= BLOCK_CHAIN (p
))
704 BLOCK_SUPERCONTEXT (p
) = block
;
706 BLOCK_VARS (block
) = 0;
709 /* The TYPE_CONTEXTs for all of the tagged types belonging to this
710 scope must be set so that they point to the appropriate
711 construct, i.e. either to the current FUNCTION_DECL node, or
712 else to the BLOCK node we just constructed.
714 Note that for tagged types whose scope is just the formal
715 parameter list for some function type specification, we can't
716 properly set their TYPE_CONTEXTs here, because we don't have a
717 pointer to the appropriate FUNCTION_TYPE node readily available
718 to us. For those cases, the TYPE_CONTEXTs of the relevant tagged
719 type nodes get set in `grokdeclarator' as soon as we have created
720 the FUNCTION_TYPE node which will represent the "scope" for these
721 "parameter list local" tagged types. */
722 if (scope
->function_body
)
723 context
= current_function_decl
;
724 else if (scope
== file_scope
)
726 tree file_decl
= build_decl (TRANSLATION_UNIT_DECL
, 0, 0);
727 TREE_CHAIN (file_decl
) = all_translation_units
;
728 all_translation_units
= file_decl
;
734 /* Clear all bindings in this scope. */
735 for (b
= scope
->bindings
; b
; b
= free_binding_and_advance (b
))
738 switch (TREE_CODE (p
))
741 /* Warnings for unused labels, errors for undefined labels. */
742 if (TREE_USED (p
) && !DECL_INITIAL (p
))
744 error ("label %q+D used but not defined", p
);
745 DECL_INITIAL (p
) = error_mark_node
;
748 warn_for_unused_label (p
);
750 /* Labels go in BLOCK_VARS. */
751 TREE_CHAIN (p
) = BLOCK_VARS (block
);
752 BLOCK_VARS (block
) = p
;
753 gcc_assert (I_LABEL_BINDING (b
->id
) == b
);
754 I_LABEL_BINDING (b
->id
) = b
->shadowed
;
760 set_type_context (p
, context
);
762 /* Types may not have tag-names, in which case the type
763 appears in the bindings list with b->id NULL. */
766 gcc_assert (I_TAG_BINDING (b
->id
) == b
);
767 I_TAG_BINDING (b
->id
) = b
->shadowed
;
772 /* Propagate TREE_ADDRESSABLE from nested functions to their
773 containing functions. */
774 if (!TREE_ASM_WRITTEN (p
)
775 && DECL_INITIAL (p
) != 0
776 && TREE_ADDRESSABLE (p
)
777 && DECL_ABSTRACT_ORIGIN (p
) != 0
778 && DECL_ABSTRACT_ORIGIN (p
) != p
)
779 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (p
)) = 1;
780 if (!DECL_EXTERNAL (p
)
782 && scope
!= file_scope
783 && scope
!= external_scope
)
785 error ("nested function %q+D declared but never defined", p
);
786 undef_nested_function
= true;
788 else if (DECL_DECLARED_INLINE_P (p
)
790 && !DECL_INITIAL (p
))
792 /* C99 6.7.4p6: "a function with external linkage... declared
793 with an inline function specifier ... shall also be defined
794 in the same translation unit." */
795 if (!flag_gnu89_inline
)
796 pedwarn (input_location
, 0,
797 "inline function %q+D declared but never defined", p
);
798 DECL_EXTERNAL (p
) = 1;
804 /* Warnings for unused variables. */
806 && !TREE_NO_WARNING (p
)
807 && !DECL_IN_SYSTEM_HEADER (p
)
809 && !DECL_ARTIFICIAL (p
)
810 && scope
!= file_scope
811 && scope
!= external_scope
)
812 warning (OPT_Wunused_variable
, "unused variable %q+D", p
);
816 error ("type of array %q+D completed incompatibly with"
817 " implicit initialization", p
);
824 /* All of these go in BLOCK_VARS, but only if this is the
825 binding in the home scope. */
828 TREE_CHAIN (p
) = BLOCK_VARS (block
);
829 BLOCK_VARS (block
) = p
;
831 else if (VAR_OR_FUNCTION_DECL_P (p
))
833 /* For block local externs add a special
834 DECL_EXTERNAL decl for debug info generation. */
835 tree extp
= copy_node (p
);
837 DECL_EXTERNAL (extp
) = 1;
838 TREE_STATIC (extp
) = 0;
839 TREE_PUBLIC (extp
) = 1;
840 DECL_INITIAL (extp
) = NULL_TREE
;
841 DECL_LANG_SPECIFIC (extp
) = NULL
;
842 DECL_CONTEXT (extp
) = current_function_decl
;
843 if (TREE_CODE (p
) == FUNCTION_DECL
)
845 DECL_RESULT (extp
) = NULL_TREE
;
846 DECL_SAVED_TREE (extp
) = NULL_TREE
;
847 DECL_STRUCT_FUNCTION (extp
) = NULL
;
849 if (b
->locus
!= UNKNOWN_LOCATION
)
850 DECL_SOURCE_LOCATION (extp
) = b
->locus
;
851 TREE_CHAIN (extp
) = BLOCK_VARS (block
);
852 BLOCK_VARS (block
) = extp
;
854 /* If this is the file scope, and we are processing more
855 than one translation unit in this compilation, set
856 DECL_CONTEXT of each decl to the TRANSLATION_UNIT_DECL.
857 This makes same_translation_unit_p work, and causes
858 static declarations to be given disambiguating suffixes. */
859 if (scope
== file_scope
&& num_in_fnames
> 1)
861 DECL_CONTEXT (p
) = context
;
862 if (TREE_CODE (p
) == TYPE_DECL
)
863 set_type_context (TREE_TYPE (p
), context
);
867 /* Parameters go in DECL_ARGUMENTS, not BLOCK_VARS, and have
868 already been put there by store_parm_decls. Unused-
869 parameter warnings are handled by function.c.
870 error_mark_node obviously does not go in BLOCK_VARS and
871 does not get unused-variable warnings. */
874 /* It is possible for a decl not to have a name. We get
875 here with b->id NULL in this case. */
878 gcc_assert (I_SYMBOL_BINDING (b
->id
) == b
);
879 I_SYMBOL_BINDING (b
->id
) = b
->shadowed
;
880 if (b
->shadowed
&& b
->shadowed
->type
)
881 TREE_TYPE (b
->shadowed
->decl
) = b
->shadowed
->type
;
891 /* Dispose of the block that we just made inside some higher level. */
892 if ((scope
->function_body
|| scope
== file_scope
) && context
)
894 DECL_INITIAL (context
) = block
;
895 BLOCK_SUPERCONTEXT (block
) = context
;
897 else if (scope
->outer
)
900 SCOPE_LIST_APPEND (scope
->outer
, blocks
, block
);
901 /* If we did not make a block for the scope just exited, any
902 blocks made for inner scopes must be carried forward so they
903 will later become subblocks of something else. */
904 else if (scope
->blocks
)
905 SCOPE_LIST_CONCAT (scope
->outer
, blocks
, scope
, blocks
);
908 /* Pop the current scope, and free the structure for reuse. */
909 current_scope
= scope
->outer
;
910 if (scope
->function_body
)
911 current_function_scope
= scope
->outer_function
;
913 memset (scope
, 0, sizeof (struct c_scope
));
914 scope
->outer
= scope_freelist
;
915 scope_freelist
= scope
;
921 push_file_scope (void)
929 file_scope
= current_scope
;
931 start_fname_decls ();
933 for (decl
= visible_builtins
; decl
; decl
= TREE_CHAIN (decl
))
934 bind (DECL_NAME (decl
), decl
, file_scope
,
935 /*invisible=*/false, /*nested=*/true, DECL_SOURCE_LOCATION (decl
));
939 pop_file_scope (void)
941 /* In case there were missing closebraces, get us back to the global
943 while (current_scope
!= file_scope
)
946 /* __FUNCTION__ is defined at file scope (""). This
947 call may not be necessary as my tests indicate it
948 still works without it. */
949 finish_fname_decls ();
951 /* This is the point to write out a PCH if we're doing that.
952 In that case we do not want to do anything else. */
955 c_common_write_pch ();
959 /* Pop off the file scope and close this translation unit. */
963 maybe_apply_pending_pragma_weaks ();
964 cgraph_finalize_compilation_unit ();
968 /* Push a definition or a declaration of struct, union or enum tag "name".
969 "type" should be the type node.
970 We assume that the tag "name" is not already defined.
972 Note that the definition may really be just a forward reference.
973 In that case, the TYPE_SIZE will be zero. */
976 pushtag (tree name
, tree type
)
978 /* Record the identifier as the type's name if it has none. */
979 if (name
&& !TYPE_NAME (type
))
980 TYPE_NAME (type
) = name
;
981 bind (name
, type
, current_scope
, /*invisible=*/false, /*nested=*/false,
984 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
985 tagged type we just added to the current scope. This fake
986 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
987 to output a representation of a tagged type, and it also gives
988 us a convenient place to record the "scope start" address for the
991 TYPE_STUB_DECL (type
) = pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, type
));
993 /* An approximation for now, so we can tell this is a function-scope tag.
994 This will be updated in pop_scope. */
995 TYPE_CONTEXT (type
) = DECL_CONTEXT (TYPE_STUB_DECL (type
));
998 /* Subroutine of compare_decls. Allow harmless mismatches in return
999 and argument types provided that the type modes match. This function
1000 return a unified type given a suitable match, and 0 otherwise. */
1003 match_builtin_function_types (tree newtype
, tree oldtype
)
1005 tree newrettype
, oldrettype
;
1006 tree newargs
, oldargs
;
1007 tree trytype
, tryargs
;
1009 /* Accept the return type of the new declaration if same modes. */
1010 oldrettype
= TREE_TYPE (oldtype
);
1011 newrettype
= TREE_TYPE (newtype
);
1013 if (TYPE_MODE (oldrettype
) != TYPE_MODE (newrettype
))
1016 oldargs
= TYPE_ARG_TYPES (oldtype
);
1017 newargs
= TYPE_ARG_TYPES (newtype
);
1020 while (oldargs
|| newargs
)
1024 || !TREE_VALUE (oldargs
)
1025 || !TREE_VALUE (newargs
)
1026 || TYPE_MODE (TREE_VALUE (oldargs
))
1027 != TYPE_MODE (TREE_VALUE (newargs
)))
1030 oldargs
= TREE_CHAIN (oldargs
);
1031 newargs
= TREE_CHAIN (newargs
);
1034 trytype
= build_function_type (newrettype
, tryargs
);
1035 return build_type_attribute_variant (trytype
, TYPE_ATTRIBUTES (oldtype
));
1038 /* Subroutine of diagnose_mismatched_decls. Check for function type
1039 mismatch involving an empty arglist vs a nonempty one and give clearer
1042 diagnose_arglist_conflict (tree newdecl
, tree olddecl
,
1043 tree newtype
, tree oldtype
)
1047 if (TREE_CODE (olddecl
) != FUNCTION_DECL
1048 || !comptypes (TREE_TYPE (oldtype
), TREE_TYPE (newtype
))
1049 || !((TYPE_ARG_TYPES (oldtype
) == 0 && DECL_INITIAL (olddecl
) == 0)
1051 (TYPE_ARG_TYPES (newtype
) == 0 && DECL_INITIAL (newdecl
) == 0)))
1054 t
= TYPE_ARG_TYPES (oldtype
);
1056 t
= TYPE_ARG_TYPES (newtype
);
1057 for (; t
; t
= TREE_CHAIN (t
))
1059 tree type
= TREE_VALUE (t
);
1061 if (TREE_CHAIN (t
) == 0
1062 && TYPE_MAIN_VARIANT (type
) != void_type_node
)
1064 inform (input_location
, "a parameter list with an ellipsis can%'t match "
1065 "an empty parameter name list declaration");
1069 if (c_type_promotes_to (type
) != type
)
1071 inform (input_location
, "an argument type that has a default promotion can%'t match "
1072 "an empty parameter name list declaration");
1078 /* Another subroutine of diagnose_mismatched_decls. OLDDECL is an
1079 old-style function definition, NEWDECL is a prototype declaration.
1080 Diagnose inconsistencies in the argument list. Returns TRUE if
1081 the prototype is compatible, FALSE if not. */
1083 validate_proto_after_old_defn (tree newdecl
, tree newtype
, tree oldtype
)
1085 tree newargs
, oldargs
;
1088 #define END_OF_ARGLIST(t) ((t) == void_type_node)
1090 oldargs
= TYPE_ACTUAL_ARG_TYPES (oldtype
);
1091 newargs
= TYPE_ARG_TYPES (newtype
);
1096 tree oldargtype
= TREE_VALUE (oldargs
);
1097 tree newargtype
= TREE_VALUE (newargs
);
1099 if (oldargtype
== error_mark_node
|| newargtype
== error_mark_node
)
1102 oldargtype
= TYPE_MAIN_VARIANT (oldargtype
);
1103 newargtype
= TYPE_MAIN_VARIANT (newargtype
);
1105 if (END_OF_ARGLIST (oldargtype
) && END_OF_ARGLIST (newargtype
))
1108 /* Reaching the end of just one list means the two decls don't
1109 agree on the number of arguments. */
1110 if (END_OF_ARGLIST (oldargtype
))
1112 error ("prototype for %q+D declares more arguments "
1113 "than previous old-style definition", newdecl
);
1116 else if (END_OF_ARGLIST (newargtype
))
1118 error ("prototype for %q+D declares fewer arguments "
1119 "than previous old-style definition", newdecl
);
1123 /* Type for passing arg must be consistent with that declared
1125 else if (!comptypes (oldargtype
, newargtype
))
1127 error ("prototype for %q+D declares argument %d"
1128 " with incompatible type",
1133 oldargs
= TREE_CHAIN (oldargs
);
1134 newargs
= TREE_CHAIN (newargs
);
1138 /* If we get here, no errors were found, but do issue a warning
1139 for this poor-style construct. */
1140 warning (0, "prototype for %q+D follows non-prototype definition",
1143 #undef END_OF_ARGLIST
1146 /* Subroutine of diagnose_mismatched_decls. Report the location of DECL,
1147 first in a pair of mismatched declarations, using the diagnostic
1150 locate_old_decl (tree decl
)
1152 if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_BUILT_IN (decl
))
1154 else if (DECL_INITIAL (decl
))
1155 inform (input_location
, "previous definition of %q+D was here", decl
);
1156 else if (C_DECL_IMPLICIT (decl
))
1157 inform (input_location
, "previous implicit declaration of %q+D was here", decl
);
1159 inform (input_location
, "previous declaration of %q+D was here", decl
);
1162 /* Subroutine of duplicate_decls. Compare NEWDECL to OLDDECL.
1163 Returns true if the caller should proceed to merge the two, false
1164 if OLDDECL should simply be discarded. As a side effect, issues
1165 all necessary diagnostics for invalid or poor-style combinations.
1166 If it returns true, writes the types of NEWDECL and OLDDECL to
1167 *NEWTYPEP and *OLDTYPEP - these may have been adjusted from
1168 TREE_TYPE (NEWDECL, OLDDECL) respectively. */
1171 diagnose_mismatched_decls (tree newdecl
, tree olddecl
,
1172 tree
*newtypep
, tree
*oldtypep
)
1174 tree newtype
, oldtype
;
1175 bool pedwarned
= false;
1176 bool warned
= false;
1179 #define DECL_EXTERN_INLINE(DECL) (DECL_DECLARED_INLINE_P (DECL) \
1180 && DECL_EXTERNAL (DECL))
1182 /* If we have error_mark_node for either decl or type, just discard
1183 the previous decl - we're in an error cascade already. */
1184 if (olddecl
== error_mark_node
|| newdecl
== error_mark_node
)
1186 *oldtypep
= oldtype
= TREE_TYPE (olddecl
);
1187 *newtypep
= newtype
= TREE_TYPE (newdecl
);
1188 if (oldtype
== error_mark_node
|| newtype
== error_mark_node
)
1191 /* Two different categories of symbol altogether. This is an error
1192 unless OLDDECL is a builtin. OLDDECL will be discarded in any case. */
1193 if (TREE_CODE (olddecl
) != TREE_CODE (newdecl
))
1195 if (!(TREE_CODE (olddecl
) == FUNCTION_DECL
1196 && DECL_BUILT_IN (olddecl
)
1197 && !C_DECL_DECLARED_BUILTIN (olddecl
)))
1199 error ("%q+D redeclared as different kind of symbol", newdecl
);
1200 locate_old_decl (olddecl
);
1202 else if (TREE_PUBLIC (newdecl
))
1203 warning (0, "built-in function %q+D declared as non-function",
1206 warning (OPT_Wshadow
, "declaration of %q+D shadows "
1207 "a built-in function", newdecl
);
1211 /* Enumerators have no linkage, so may only be declared once in a
1213 if (TREE_CODE (olddecl
) == CONST_DECL
)
1215 error ("redeclaration of enumerator %q+D", newdecl
);
1216 locate_old_decl (olddecl
);
1220 if (!comptypes (oldtype
, newtype
))
1222 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1223 && DECL_BUILT_IN (olddecl
) && !C_DECL_DECLARED_BUILTIN (olddecl
))
1225 /* Accept harmless mismatch in function types.
1226 This is for the ffs and fprintf builtins. */
1227 tree trytype
= match_builtin_function_types (newtype
, oldtype
);
1229 if (trytype
&& comptypes (newtype
, trytype
))
1230 *oldtypep
= oldtype
= trytype
;
1233 /* If types don't match for a built-in, throw away the
1234 built-in. No point in calling locate_old_decl here, it
1235 won't print anything. */
1236 warning (0, "conflicting types for built-in function %q+D",
1241 else if (TREE_CODE (olddecl
) == FUNCTION_DECL
1242 && DECL_IS_BUILTIN (olddecl
))
1244 /* A conflicting function declaration for a predeclared
1245 function that isn't actually built in. Objective C uses
1246 these. The new declaration silently overrides everything
1247 but the volatility (i.e. noreturn) indication. See also
1248 below. FIXME: Make Objective C use normal builtins. */
1249 TREE_THIS_VOLATILE (newdecl
) |= TREE_THIS_VOLATILE (olddecl
);
1252 /* Permit void foo (...) to match int foo (...) if the latter is
1253 the definition and implicit int was used. See
1254 c-torture/compile/920625-2.c. */
1255 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
&& DECL_INITIAL (newdecl
)
1256 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype
)) == void_type_node
1257 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype
)) == integer_type_node
1258 && C_FUNCTION_IMPLICIT_INT (newdecl
) && !DECL_INITIAL (olddecl
))
1260 pedwarned
= pedwarn (input_location
, 0,
1261 "conflicting types for %q+D", newdecl
);
1262 /* Make sure we keep void as the return type. */
1263 TREE_TYPE (newdecl
) = *newtypep
= newtype
= oldtype
;
1264 C_FUNCTION_IMPLICIT_INT (newdecl
) = 0;
1266 /* Permit void foo (...) to match an earlier call to foo (...) with
1267 no declared type (thus, implicitly int). */
1268 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
1269 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype
)) == void_type_node
1270 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype
)) == integer_type_node
1271 && C_DECL_IMPLICIT (olddecl
) && !DECL_INITIAL (olddecl
))
1273 pedwarned
= pedwarn (input_location
, 0,
1274 "conflicting types for %q+D", newdecl
);
1275 /* Make sure we keep void as the return type. */
1276 TREE_TYPE (olddecl
) = *oldtypep
= oldtype
= newtype
;
1280 if (TYPE_QUALS (newtype
) != TYPE_QUALS (oldtype
))
1281 error ("conflicting type qualifiers for %q+D", newdecl
);
1283 error ("conflicting types for %q+D", newdecl
);
1284 diagnose_arglist_conflict (newdecl
, olddecl
, newtype
, oldtype
);
1285 locate_old_decl (olddecl
);
1290 /* Redeclaration of a type is a constraint violation (6.7.2.3p1),
1291 but silently ignore the redeclaration if either is in a system
1292 header. (Conflicting redeclarations were handled above.) */
1293 if (TREE_CODE (newdecl
) == TYPE_DECL
)
1295 if (DECL_IN_SYSTEM_HEADER (newdecl
)
1296 || DECL_IN_SYSTEM_HEADER (olddecl
)
1297 || TREE_NO_WARNING (newdecl
)
1298 || TREE_NO_WARNING (olddecl
))
1299 return true; /* Allow OLDDECL to continue in use. */
1301 error ("redefinition of typedef %q+D", newdecl
);
1302 locate_old_decl (olddecl
);
1306 /* Function declarations can either be 'static' or 'extern' (no
1307 qualifier is equivalent to 'extern' - C99 6.2.2p5) and therefore
1308 can never conflict with each other on account of linkage
1309 (6.2.2p4). Multiple definitions are not allowed (6.9p3,5) but
1310 gnu89 mode permits two definitions if one is 'extern inline' and
1311 one is not. The non- extern-inline definition supersedes the
1312 extern-inline definition. */
1314 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1316 /* If you declare a built-in function name as static, or
1317 define the built-in with an old-style definition (so we
1318 can't validate the argument list) the built-in definition is
1319 overridden, but optionally warn this was a bad choice of name. */
1320 if (DECL_BUILT_IN (olddecl
)
1321 && !C_DECL_DECLARED_BUILTIN (olddecl
)
1322 && (!TREE_PUBLIC (newdecl
)
1323 || (DECL_INITIAL (newdecl
)
1324 && !TYPE_ARG_TYPES (TREE_TYPE (newdecl
)))))
1326 warning (OPT_Wshadow
, "declaration of %q+D shadows "
1327 "a built-in function", newdecl
);
1328 /* Discard the old built-in function. */
1332 if (DECL_INITIAL (newdecl
))
1334 if (DECL_INITIAL (olddecl
))
1336 /* If both decls are in the same TU and the new declaration
1337 isn't overriding an extern inline reject the new decl.
1338 In c99, no overriding is allowed in the same translation
1340 if ((!DECL_EXTERN_INLINE (olddecl
)
1341 || DECL_EXTERN_INLINE (newdecl
)
1342 || (!flag_gnu89_inline
1343 && (!DECL_DECLARED_INLINE_P (olddecl
)
1344 || !lookup_attribute ("gnu_inline",
1345 DECL_ATTRIBUTES (olddecl
)))
1346 && (!DECL_DECLARED_INLINE_P (newdecl
)
1347 || !lookup_attribute ("gnu_inline",
1348 DECL_ATTRIBUTES (newdecl
))))
1350 && same_translation_unit_p (newdecl
, olddecl
))
1352 error ("redefinition of %q+D", newdecl
);
1353 locate_old_decl (olddecl
);
1358 /* If we have a prototype after an old-style function definition,
1359 the argument types must be checked specially. */
1360 else if (DECL_INITIAL (olddecl
)
1361 && !TYPE_ARG_TYPES (oldtype
) && TYPE_ARG_TYPES (newtype
)
1362 && TYPE_ACTUAL_ARG_TYPES (oldtype
)
1363 && !validate_proto_after_old_defn (newdecl
, newtype
, oldtype
))
1365 locate_old_decl (olddecl
);
1368 /* A non-static declaration (even an "extern") followed by a
1369 static declaration is undefined behavior per C99 6.2.2p3-5,7.
1370 The same is true for a static forward declaration at block
1371 scope followed by a non-static declaration/definition at file
1372 scope. Static followed by non-static at the same scope is
1373 not undefined behavior, and is the most convenient way to get
1374 some effects (see e.g. what unwind-dw2-fde-glibc.c does to
1375 the definition of _Unwind_Find_FDE in unwind-dw2-fde.c), but
1376 we do diagnose it if -Wtraditional. */
1377 if (TREE_PUBLIC (olddecl
) && !TREE_PUBLIC (newdecl
))
1379 /* Two exceptions to the rule. If olddecl is an extern
1380 inline, or a predeclared function that isn't actually
1381 built in, newdecl silently overrides olddecl. The latter
1382 occur only in Objective C; see also above. (FIXME: Make
1383 Objective C use normal builtins.) */
1384 if (!DECL_IS_BUILTIN (olddecl
)
1385 && !DECL_EXTERN_INLINE (olddecl
))
1387 error ("static declaration of %q+D follows "
1388 "non-static declaration", newdecl
);
1389 locate_old_decl (olddecl
);
1393 else if (TREE_PUBLIC (newdecl
) && !TREE_PUBLIC (olddecl
))
1395 if (DECL_CONTEXT (olddecl
))
1397 error ("non-static declaration of %q+D follows "
1398 "static declaration", newdecl
);
1399 locate_old_decl (olddecl
);
1402 else if (warn_traditional
)
1404 warned
|= warning (OPT_Wtraditional
,
1405 "non-static declaration of %q+D "
1406 "follows static declaration", newdecl
);
1410 /* Make sure gnu_inline attribute is either not present, or
1411 present on all inline decls. */
1412 if (DECL_DECLARED_INLINE_P (olddecl
)
1413 && DECL_DECLARED_INLINE_P (newdecl
))
1415 bool newa
= lookup_attribute ("gnu_inline",
1416 DECL_ATTRIBUTES (newdecl
)) != NULL
;
1417 bool olda
= lookup_attribute ("gnu_inline",
1418 DECL_ATTRIBUTES (olddecl
)) != NULL
;
1421 error ("%<gnu_inline%> attribute present on %q+D",
1422 newa
? newdecl
: olddecl
);
1423 error ("%Jbut not here", newa
? olddecl
: newdecl
);
1427 else if (TREE_CODE (newdecl
) == VAR_DECL
)
1429 /* Only variables can be thread-local, and all declarations must
1430 agree on this property. */
1431 if (C_DECL_THREADPRIVATE_P (olddecl
) && !DECL_THREAD_LOCAL_P (newdecl
))
1433 /* Nothing to check. Since OLDDECL is marked threadprivate
1434 and NEWDECL does not have a thread-local attribute, we
1435 will merge the threadprivate attribute into NEWDECL. */
1438 else if (DECL_THREAD_LOCAL_P (newdecl
) != DECL_THREAD_LOCAL_P (olddecl
))
1440 if (DECL_THREAD_LOCAL_P (newdecl
))
1441 error ("thread-local declaration of %q+D follows "
1442 "non-thread-local declaration", newdecl
);
1444 error ("non-thread-local declaration of %q+D follows "
1445 "thread-local declaration", newdecl
);
1447 locate_old_decl (olddecl
);
1451 /* Multiple initialized definitions are not allowed (6.9p3,5). */
1452 if (DECL_INITIAL (newdecl
) && DECL_INITIAL (olddecl
))
1454 error ("redefinition of %q+D", newdecl
);
1455 locate_old_decl (olddecl
);
1459 /* Objects declared at file scope: if the first declaration had
1460 external linkage (even if it was an external reference) the
1461 second must have external linkage as well, or the behavior is
1462 undefined. If the first declaration had internal linkage, then
1463 the second must too, or else be an external reference (in which
1464 case the composite declaration still has internal linkage).
1465 As for function declarations, we warn about the static-then-
1466 extern case only for -Wtraditional. See generally 6.2.2p3-5,7. */
1467 if (DECL_FILE_SCOPE_P (newdecl
)
1468 && TREE_PUBLIC (newdecl
) != TREE_PUBLIC (olddecl
))
1470 if (DECL_EXTERNAL (newdecl
))
1472 if (!DECL_FILE_SCOPE_P (olddecl
))
1474 error ("extern declaration of %q+D follows "
1475 "declaration with no linkage", newdecl
);
1476 locate_old_decl (olddecl
);
1479 else if (warn_traditional
)
1481 warned
|= warning (OPT_Wtraditional
,
1482 "non-static declaration of %q+D "
1483 "follows static declaration", newdecl
);
1488 if (TREE_PUBLIC (newdecl
))
1489 error ("non-static declaration of %q+D follows "
1490 "static declaration", newdecl
);
1492 error ("static declaration of %q+D follows "
1493 "non-static declaration", newdecl
);
1495 locate_old_decl (olddecl
);
1499 /* Two objects with the same name declared at the same block
1500 scope must both be external references (6.7p3). */
1501 else if (!DECL_FILE_SCOPE_P (newdecl
))
1503 if (DECL_EXTERNAL (newdecl
))
1505 /* Extern with initializer at block scope, which will
1506 already have received an error. */
1508 else if (DECL_EXTERNAL (olddecl
))
1510 error ("declaration of %q+D with no linkage follows "
1511 "extern declaration", newdecl
);
1512 locate_old_decl (olddecl
);
1516 error ("redeclaration of %q+D with no linkage", newdecl
);
1517 locate_old_decl (olddecl
);
1525 /* All decls must agree on a visibility. */
1526 if (CODE_CONTAINS_STRUCT (TREE_CODE (newdecl
), TS_DECL_WITH_VIS
)
1527 && DECL_VISIBILITY_SPECIFIED (newdecl
) && DECL_VISIBILITY_SPECIFIED (olddecl
)
1528 && DECL_VISIBILITY (newdecl
) != DECL_VISIBILITY (olddecl
))
1530 warned
|= warning (0, "redeclaration of %q+D with different visibility "
1531 "(old visibility preserved)", newdecl
);
1534 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1536 /* Diagnose inline __attribute__ ((noinline)) which is silly. */
1537 if (DECL_DECLARED_INLINE_P (newdecl
)
1538 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl
)))
1540 warned
|= warning (OPT_Wattributes
,
1541 "inline declaration of %qD follows "
1542 "declaration with attribute noinline", newdecl
);
1544 else if (DECL_DECLARED_INLINE_P (olddecl
)
1545 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl
)))
1547 warned
|= warning (OPT_Wattributes
,
1548 "declaration of %q+D with attribute "
1549 "noinline follows inline declaration ", newdecl
);
1552 else /* PARM_DECL, VAR_DECL */
1554 /* Redeclaration of a parameter is a constraint violation (this is
1555 not explicitly stated, but follows from C99 6.7p3 [no more than
1556 one declaration of the same identifier with no linkage in the
1557 same scope, except type tags] and 6.2.2p6 [parameters have no
1558 linkage]). We must check for a forward parameter declaration,
1559 indicated by TREE_ASM_WRITTEN on the old declaration - this is
1560 an extension, the mandatory diagnostic for which is handled by
1561 mark_forward_parm_decls. */
1563 if (TREE_CODE (newdecl
) == PARM_DECL
1564 && (!TREE_ASM_WRITTEN (olddecl
) || TREE_ASM_WRITTEN (newdecl
)))
1566 error ("redefinition of parameter %q+D", newdecl
);
1567 locate_old_decl (olddecl
);
1572 /* Optional warning for completely redundant decls. */
1573 if (!warned
&& !pedwarned
1574 && warn_redundant_decls
1575 /* Don't warn about a function declaration followed by a
1577 && !(TREE_CODE (newdecl
) == FUNCTION_DECL
1578 && DECL_INITIAL (newdecl
) && !DECL_INITIAL (olddecl
))
1579 /* Don't warn about redundant redeclarations of builtins. */
1580 && !(TREE_CODE (newdecl
) == FUNCTION_DECL
1581 && !DECL_BUILT_IN (newdecl
)
1582 && DECL_BUILT_IN (olddecl
)
1583 && !C_DECL_DECLARED_BUILTIN (olddecl
))
1584 /* Don't warn about an extern followed by a definition. */
1585 && !(DECL_EXTERNAL (olddecl
) && !DECL_EXTERNAL (newdecl
))
1586 /* Don't warn about forward parameter decls. */
1587 && !(TREE_CODE (newdecl
) == PARM_DECL
1588 && TREE_ASM_WRITTEN (olddecl
) && !TREE_ASM_WRITTEN (newdecl
))
1589 /* Don't warn about a variable definition following a declaration. */
1590 && !(TREE_CODE (newdecl
) == VAR_DECL
1591 && DECL_INITIAL (newdecl
) && !DECL_INITIAL (olddecl
)))
1593 warned
= warning (OPT_Wredundant_decls
, "redundant redeclaration of %q+D",
1597 /* Report location of previous decl/defn. */
1598 if (warned
|| pedwarned
)
1599 locate_old_decl (olddecl
);
1601 #undef DECL_EXTERN_INLINE
1606 /* Subroutine of duplicate_decls. NEWDECL has been found to be
1607 consistent with OLDDECL, but carries new information. Merge the
1608 new information into OLDDECL. This function issues no
1612 merge_decls (tree newdecl
, tree olddecl
, tree newtype
, tree oldtype
)
1614 bool new_is_definition
= (TREE_CODE (newdecl
) == FUNCTION_DECL
1615 && DECL_INITIAL (newdecl
) != 0);
1616 bool new_is_prototype
= (TREE_CODE (newdecl
) == FUNCTION_DECL
1617 && TYPE_ARG_TYPES (TREE_TYPE (newdecl
)) != 0);
1618 bool old_is_prototype
= (TREE_CODE (olddecl
) == FUNCTION_DECL
1619 && TYPE_ARG_TYPES (TREE_TYPE (olddecl
)) != 0);
1620 bool extern_changed
= false;
1622 /* For real parm decl following a forward decl, rechain the old decl
1623 in its new location and clear TREE_ASM_WRITTEN (it's not a
1624 forward decl anymore). */
1625 if (TREE_CODE (newdecl
) == PARM_DECL
1626 && TREE_ASM_WRITTEN (olddecl
) && !TREE_ASM_WRITTEN (newdecl
))
1628 struct c_binding
*b
, **here
;
1630 for (here
= ¤t_scope
->bindings
; *here
; here
= &(*here
)->prev
)
1631 if ((*here
)->decl
== olddecl
)
1638 b
->prev
= current_scope
->bindings
;
1639 current_scope
->bindings
= b
;
1641 TREE_ASM_WRITTEN (olddecl
) = 0;
1644 DECL_ATTRIBUTES (newdecl
)
1645 = targetm
.merge_decl_attributes (olddecl
, newdecl
);
1647 /* Merge the data types specified in the two decls. */
1649 = TREE_TYPE (olddecl
)
1650 = composite_type (newtype
, oldtype
);
1652 /* Lay the type out, unless already done. */
1653 if (!comptypes (oldtype
, TREE_TYPE (newdecl
)))
1655 if (TREE_TYPE (newdecl
) != error_mark_node
)
1656 layout_type (TREE_TYPE (newdecl
));
1657 if (TREE_CODE (newdecl
) != FUNCTION_DECL
1658 && TREE_CODE (newdecl
) != TYPE_DECL
1659 && TREE_CODE (newdecl
) != CONST_DECL
)
1660 layout_decl (newdecl
, 0);
1664 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1665 DECL_SIZE (newdecl
) = DECL_SIZE (olddecl
);
1666 DECL_SIZE_UNIT (newdecl
) = DECL_SIZE_UNIT (olddecl
);
1667 DECL_MODE (newdecl
) = DECL_MODE (olddecl
);
1668 if (DECL_ALIGN (olddecl
) > DECL_ALIGN (newdecl
))
1670 DECL_ALIGN (newdecl
) = DECL_ALIGN (olddecl
);
1671 DECL_USER_ALIGN (newdecl
) |= DECL_USER_ALIGN (olddecl
);
1675 /* Keep the old rtl since we can safely use it. */
1676 if (HAS_RTL_P (olddecl
))
1677 COPY_DECL_RTL (olddecl
, newdecl
);
1679 /* Merge the type qualifiers. */
1680 if (TREE_READONLY (newdecl
))
1681 TREE_READONLY (olddecl
) = 1;
1683 if (TREE_THIS_VOLATILE (newdecl
))
1684 TREE_THIS_VOLATILE (olddecl
) = 1;
1686 /* Merge deprecatedness. */
1687 if (TREE_DEPRECATED (newdecl
))
1688 TREE_DEPRECATED (olddecl
) = 1;
1690 /* If a decl is in a system header and the other isn't, keep the one on the
1691 system header. Otherwise, keep source location of definition rather than
1692 declaration and of prototype rather than non-prototype unless that
1693 prototype is built-in. */
1694 if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl
), TS_DECL_WITH_VIS
)
1695 && DECL_IN_SYSTEM_HEADER (olddecl
)
1696 && !DECL_IN_SYSTEM_HEADER (newdecl
) )
1697 DECL_SOURCE_LOCATION (newdecl
) = DECL_SOURCE_LOCATION (olddecl
);
1698 else if (CODE_CONTAINS_STRUCT (TREE_CODE (olddecl
), TS_DECL_WITH_VIS
)
1699 && DECL_IN_SYSTEM_HEADER (newdecl
)
1700 && !DECL_IN_SYSTEM_HEADER (olddecl
))
1701 DECL_SOURCE_LOCATION (olddecl
) = DECL_SOURCE_LOCATION (newdecl
);
1702 else 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 section attribute.
1721 We want to issue an error if the sections conflict but that
1722 must be done later in decl_attributes since we are called
1723 before attributes are assigned. */
1724 if (DECL_SECTION_NAME (newdecl
) == NULL_TREE
)
1725 DECL_SECTION_NAME (newdecl
) = DECL_SECTION_NAME (olddecl
);
1727 /* Copy the assembler name.
1728 Currently, it can only be defined in the prototype. */
1729 COPY_DECL_ASSEMBLER_NAME (olddecl
, newdecl
);
1731 /* Use visibility of whichever declaration had it specified */
1732 if (DECL_VISIBILITY_SPECIFIED (olddecl
))
1734 DECL_VISIBILITY (newdecl
) = DECL_VISIBILITY (olddecl
);
1735 DECL_VISIBILITY_SPECIFIED (newdecl
) = 1;
1738 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1740 DECL_STATIC_CONSTRUCTOR(newdecl
) |= DECL_STATIC_CONSTRUCTOR(olddecl
);
1741 DECL_STATIC_DESTRUCTOR (newdecl
) |= DECL_STATIC_DESTRUCTOR (olddecl
);
1742 DECL_NO_LIMIT_STACK (newdecl
) |= DECL_NO_LIMIT_STACK (olddecl
);
1743 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl
)
1744 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl
);
1745 TREE_THIS_VOLATILE (newdecl
) |= TREE_THIS_VOLATILE (olddecl
);
1746 DECL_IS_MALLOC (newdecl
) |= DECL_IS_MALLOC (olddecl
);
1747 DECL_IS_OPERATOR_NEW (newdecl
) |= DECL_IS_OPERATOR_NEW (olddecl
);
1748 TREE_READONLY (newdecl
) |= TREE_READONLY (olddecl
);
1749 DECL_PURE_P (newdecl
) |= DECL_PURE_P (olddecl
);
1750 DECL_IS_NOVOPS (newdecl
) |= DECL_IS_NOVOPS (olddecl
);
1753 /* Merge the storage class information. */
1754 merge_weak (newdecl
, olddecl
);
1756 /* For functions, static overrides non-static. */
1757 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1759 TREE_PUBLIC (newdecl
) &= TREE_PUBLIC (olddecl
);
1760 /* This is since we don't automatically
1761 copy the attributes of NEWDECL into OLDDECL. */
1762 TREE_PUBLIC (olddecl
) = TREE_PUBLIC (newdecl
);
1763 /* If this clears `static', clear it in the identifier too. */
1764 if (!TREE_PUBLIC (olddecl
))
1765 TREE_PUBLIC (DECL_NAME (olddecl
)) = 0;
1769 /* In c99, 'extern' declaration before (or after) 'inline' means this
1770 function is not DECL_EXTERNAL, unless 'gnu_inline' attribute
1772 if (TREE_CODE (newdecl
) == FUNCTION_DECL
1773 && !flag_gnu89_inline
1774 && (DECL_DECLARED_INLINE_P (newdecl
)
1775 || DECL_DECLARED_INLINE_P (olddecl
))
1776 && (!DECL_DECLARED_INLINE_P (newdecl
)
1777 || !DECL_DECLARED_INLINE_P (olddecl
)
1778 || !DECL_EXTERNAL (olddecl
))
1779 && DECL_EXTERNAL (newdecl
)
1780 && !lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (newdecl
))
1781 && !current_function_decl
)
1782 DECL_EXTERNAL (newdecl
) = 0;
1784 if (DECL_EXTERNAL (newdecl
))
1786 TREE_STATIC (newdecl
) = TREE_STATIC (olddecl
);
1787 DECL_EXTERNAL (newdecl
) = DECL_EXTERNAL (olddecl
);
1789 /* An extern decl does not override previous storage class. */
1790 TREE_PUBLIC (newdecl
) = TREE_PUBLIC (olddecl
);
1791 if (!DECL_EXTERNAL (newdecl
))
1793 DECL_CONTEXT (newdecl
) = DECL_CONTEXT (olddecl
);
1794 DECL_COMMON (newdecl
) = DECL_COMMON (olddecl
);
1799 TREE_STATIC (olddecl
) = TREE_STATIC (newdecl
);
1800 TREE_PUBLIC (olddecl
) = TREE_PUBLIC (newdecl
);
1803 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1805 /* If we're redefining a function previously defined as extern
1806 inline, make sure we emit debug info for the inline before we
1807 throw it away, in case it was inlined into a function that
1808 hasn't been written out yet. */
1809 if (new_is_definition
&& DECL_INITIAL (olddecl
))
1810 /* The new defn must not be inline. */
1811 DECL_UNINLINABLE (newdecl
) = 1;
1814 /* If either decl says `inline', this fn is inline, unless
1815 its definition was passed already. */
1816 if (DECL_DECLARED_INLINE_P (newdecl
)
1817 || DECL_DECLARED_INLINE_P (olddecl
))
1818 DECL_DECLARED_INLINE_P (newdecl
) = 1;
1820 DECL_UNINLINABLE (newdecl
) = DECL_UNINLINABLE (olddecl
)
1821 = (DECL_UNINLINABLE (newdecl
) || DECL_UNINLINABLE (olddecl
));
1823 DECL_DISREGARD_INLINE_LIMITS (newdecl
)
1824 = DECL_DISREGARD_INLINE_LIMITS (olddecl
)
1825 = (DECL_DISREGARD_INLINE_LIMITS (newdecl
)
1826 || DECL_DISREGARD_INLINE_LIMITS (olddecl
));
1829 if (DECL_BUILT_IN (olddecl
))
1831 /* If redeclaring a builtin function, it stays built in.
1832 But it gets tagged as having been declared. */
1833 DECL_BUILT_IN_CLASS (newdecl
) = DECL_BUILT_IN_CLASS (olddecl
);
1834 DECL_FUNCTION_CODE (newdecl
) = DECL_FUNCTION_CODE (olddecl
);
1835 C_DECL_DECLARED_BUILTIN (newdecl
) = 1;
1836 if (new_is_prototype
)
1837 C_DECL_BUILTIN_PROTOTYPE (newdecl
) = 0;
1839 C_DECL_BUILTIN_PROTOTYPE (newdecl
)
1840 = C_DECL_BUILTIN_PROTOTYPE (olddecl
);
1843 /* Preserve function specific target and optimization options */
1844 if (DECL_FUNCTION_SPECIFIC_TARGET (olddecl
)
1845 && !DECL_FUNCTION_SPECIFIC_TARGET (newdecl
))
1846 DECL_FUNCTION_SPECIFIC_TARGET (newdecl
)
1847 = DECL_FUNCTION_SPECIFIC_TARGET (olddecl
);
1849 if (DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl
)
1850 && !DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl
))
1851 DECL_FUNCTION_SPECIFIC_OPTIMIZATION (newdecl
)
1852 = DECL_FUNCTION_SPECIFIC_OPTIMIZATION (olddecl
);
1854 /* Also preserve various other info from the definition. */
1855 if (!new_is_definition
)
1858 DECL_RESULT (newdecl
) = DECL_RESULT (olddecl
);
1859 DECL_INITIAL (newdecl
) = DECL_INITIAL (olddecl
);
1860 DECL_STRUCT_FUNCTION (newdecl
) = DECL_STRUCT_FUNCTION (olddecl
);
1861 DECL_SAVED_TREE (newdecl
) = DECL_SAVED_TREE (olddecl
);
1862 gimple_set_body (newdecl
, gimple_body (olddecl
));
1863 DECL_ARGUMENTS (newdecl
) = copy_list (DECL_ARGUMENTS (olddecl
));
1864 for (t
= DECL_ARGUMENTS (newdecl
); t
; t
= TREE_CHAIN (t
))
1865 DECL_CONTEXT (t
) = newdecl
;
1867 /* See if we've got a function to instantiate from. */
1868 if (DECL_SAVED_TREE (olddecl
))
1869 DECL_ABSTRACT_ORIGIN (newdecl
)
1870 = DECL_ABSTRACT_ORIGIN (olddecl
);
1874 extern_changed
= DECL_EXTERNAL (olddecl
) && !DECL_EXTERNAL (newdecl
);
1876 /* Merge the USED information. */
1877 if (TREE_USED (olddecl
))
1878 TREE_USED (newdecl
) = 1;
1879 else if (TREE_USED (newdecl
))
1880 TREE_USED (olddecl
) = 1;
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
);
1887 tree olddecl_arguments
= NULL
;
1888 if (TREE_CODE (olddecl
) == FUNCTION_DECL
)
1889 olddecl_arguments
= DECL_ARGUMENTS (olddecl
);
1891 memcpy ((char *) olddecl
+ sizeof (struct tree_common
),
1892 (char *) newdecl
+ sizeof (struct tree_common
),
1893 sizeof (struct tree_decl_common
) - sizeof (struct tree_common
));
1894 switch (TREE_CODE (olddecl
))
1897 gimple_set_body (olddecl
, gimple_body (newdecl
));
1907 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
1908 (char *) newdecl
+ sizeof (struct tree_decl_common
),
1909 tree_code_size (TREE_CODE (olddecl
)) - sizeof (struct tree_decl_common
));
1914 memcpy ((char *) olddecl
+ sizeof (struct tree_decl_common
),
1915 (char *) newdecl
+ sizeof (struct tree_decl_common
),
1916 sizeof (struct tree_decl_non_common
) - sizeof (struct tree_decl_common
));
1918 DECL_UID (olddecl
) = olddecl_uid
;
1919 DECL_CONTEXT (olddecl
) = olddecl_context
;
1920 if (TREE_CODE (olddecl
) == FUNCTION_DECL
)
1921 DECL_ARGUMENTS (olddecl
) = olddecl_arguments
;
1924 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
1925 so that encode_section_info has a chance to look at the new decl
1926 flags and attributes. */
1927 if (DECL_RTL_SET_P (olddecl
)
1928 && (TREE_CODE (olddecl
) == FUNCTION_DECL
1929 || (TREE_CODE (olddecl
) == VAR_DECL
1930 && TREE_STATIC (olddecl
))))
1931 make_decl_rtl (olddecl
);
1933 /* If we changed a function from DECL_EXTERNAL to !DECL_EXTERNAL,
1934 and the definition is coming from the old version, cgraph needs
1935 to be called again. */
1936 if (extern_changed
&& !new_is_definition
1937 && TREE_CODE (olddecl
) == FUNCTION_DECL
&& DECL_INITIAL (olddecl
))
1938 cgraph_mark_if_needed (olddecl
);
1941 /* Handle when a new declaration NEWDECL has the same name as an old
1942 one OLDDECL in the same binding contour. Prints an error message
1945 If safely possible, alter OLDDECL to look like NEWDECL, and return
1946 true. Otherwise, return false. */
1949 duplicate_decls (tree newdecl
, tree olddecl
)
1951 tree newtype
= NULL
, oldtype
= NULL
;
1953 if (!diagnose_mismatched_decls (newdecl
, olddecl
, &newtype
, &oldtype
))
1955 /* Avoid `unused variable' and other warnings for OLDDECL. */
1956 TREE_NO_WARNING (olddecl
) = 1;
1960 merge_decls (newdecl
, olddecl
, newtype
, oldtype
);
1965 /* Check whether decl-node NEW_DECL shadows an existing declaration. */
1967 warn_if_shadowing (tree new_decl
)
1969 struct c_binding
*b
;
1971 /* Shadow warnings wanted? */
1973 /* No shadow warnings for internally generated vars. */
1974 || DECL_IS_BUILTIN (new_decl
)
1975 /* No shadow warnings for vars made for inlining. */
1976 || DECL_FROM_INLINE (new_decl
))
1979 /* Is anything being shadowed? Invisible decls do not count. */
1980 for (b
= I_SYMBOL_BINDING (DECL_NAME (new_decl
)); b
; b
= b
->shadowed
)
1981 if (b
->decl
&& b
->decl
!= new_decl
&& !b
->invisible
)
1983 tree old_decl
= b
->decl
;
1985 if (old_decl
== error_mark_node
)
1987 warning (OPT_Wshadow
, "declaration of %q+D shadows previous "
1988 "non-variable", new_decl
);
1991 else if (TREE_CODE (old_decl
) == PARM_DECL
)
1992 warning (OPT_Wshadow
, "declaration of %q+D shadows a parameter",
1994 else if (DECL_FILE_SCOPE_P (old_decl
))
1995 warning (OPT_Wshadow
, "declaration of %q+D shadows a global "
1996 "declaration", new_decl
);
1997 else if (TREE_CODE (old_decl
) == FUNCTION_DECL
1998 && DECL_BUILT_IN (old_decl
))
2000 warning (OPT_Wshadow
, "declaration of %q+D shadows "
2001 "a built-in function", new_decl
);
2005 warning (OPT_Wshadow
, "declaration of %q+D shadows a previous local",
2008 warning (OPT_Wshadow
, "%Jshadowed declaration is here", old_decl
);
2014 /* Record a decl-node X as belonging to the current lexical scope.
2015 Check for errors (such as an incompatible declaration for the same
2016 name already seen in the same scope).
2018 Returns either X or an old decl for the same name.
2019 If an old decl is returned, it may have been smashed
2020 to agree with what X says. */
2025 tree name
= DECL_NAME (x
);
2026 struct c_scope
*scope
= current_scope
;
2027 struct c_binding
*b
;
2028 bool nested
= false;
2029 location_t locus
= DECL_SOURCE_LOCATION (x
);
2031 /* Must set DECL_CONTEXT for everything not at file scope or
2032 DECL_FILE_SCOPE_P won't work. Local externs don't count
2033 unless they have initializers (which generate code). */
2034 if (current_function_decl
2035 && ((TREE_CODE (x
) != FUNCTION_DECL
&& TREE_CODE (x
) != VAR_DECL
)
2036 || DECL_INITIAL (x
) || !DECL_EXTERNAL (x
)))
2037 DECL_CONTEXT (x
) = current_function_decl
;
2039 /* If this is of variably modified type, prevent jumping into its
2041 if ((TREE_CODE (x
) == VAR_DECL
|| TREE_CODE (x
) == TYPE_DECL
)
2042 && variably_modified_type_p (TREE_TYPE (x
), NULL_TREE
))
2043 c_begin_vm_scope (scope
->depth
);
2045 /* Anonymous decls are just inserted in the scope. */
2048 bind (name
, x
, scope
, /*invisible=*/false, /*nested=*/false,
2053 /* First, see if there is another declaration with the same name in
2054 the current scope. If there is, duplicate_decls may do all the
2055 work for us. If duplicate_decls returns false, that indicates
2056 two incompatible decls in the same scope; we are to silently
2057 replace the old one (duplicate_decls has issued all appropriate
2058 diagnostics). In particular, we should not consider possible
2059 duplicates in the external scope, or shadowing. */
2060 b
= I_SYMBOL_BINDING (name
);
2061 if (b
&& B_IN_SCOPE (b
, scope
))
2063 struct c_binding
*b_ext
, *b_use
;
2064 tree type
= TREE_TYPE (x
);
2065 tree visdecl
= b
->decl
;
2066 tree vistype
= TREE_TYPE (visdecl
);
2067 if (TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
2068 && COMPLETE_TYPE_P (TREE_TYPE (x
)))
2069 b
->inner_comp
= false;
2072 /* If this is an external linkage declaration, we should check
2073 for compatibility with the type in the external scope before
2074 setting the type at this scope based on the visible
2075 information only. */
2076 if (TREE_PUBLIC (x
) && TREE_PUBLIC (visdecl
))
2078 while (b_ext
&& !B_IN_EXTERNAL_SCOPE (b_ext
))
2079 b_ext
= b_ext
->shadowed
;
2084 TREE_TYPE (b_use
->decl
) = b_use
->type
;
2087 if (duplicate_decls (x
, b_use
->decl
))
2091 /* Save the updated type in the external scope and
2092 restore the proper type for this scope. */
2094 if (comptypes (vistype
, type
))
2095 thistype
= composite_type (vistype
, type
);
2097 thistype
= TREE_TYPE (b_use
->decl
);
2098 b_use
->type
= TREE_TYPE (b_use
->decl
);
2099 if (TREE_CODE (b_use
->decl
) == FUNCTION_DECL
2100 && DECL_BUILT_IN (b_use
->decl
))
2102 = build_type_attribute_variant (thistype
,
2105 TREE_TYPE (b_use
->decl
) = thistype
;
2110 goto skip_external_and_shadow_checks
;
2113 /* All declarations with external linkage, and all external
2114 references, go in the external scope, no matter what scope is
2115 current. However, the binding in that scope is ignored for
2116 purposes of normal name lookup. A separate binding structure is
2117 created in the requested scope; this governs the normal
2118 visibility of the symbol.
2120 The binding in the externals scope is used exclusively for
2121 detecting duplicate declarations of the same object, no matter
2122 what scope they are in; this is what we do here. (C99 6.2.7p2:
2123 All declarations that refer to the same object or function shall
2124 have compatible type; otherwise, the behavior is undefined.) */
2125 if (DECL_EXTERNAL (x
) || scope
== file_scope
)
2127 tree type
= TREE_TYPE (x
);
2130 bool type_saved
= false;
2131 if (b
&& !B_IN_EXTERNAL_SCOPE (b
)
2132 && (TREE_CODE (b
->decl
) == FUNCTION_DECL
2133 || TREE_CODE (b
->decl
) == VAR_DECL
)
2134 && DECL_FILE_SCOPE_P (b
->decl
))
2137 vistype
= TREE_TYPE (visdecl
);
2139 if (scope
!= file_scope
2140 && !DECL_IN_SYSTEM_HEADER (x
))
2141 warning (OPT_Wnested_externs
, "nested extern declaration of %qD", x
);
2143 while (b
&& !B_IN_EXTERNAL_SCOPE (b
))
2145 /* If this decl might be modified, save its type. This is
2146 done here rather than when the decl is first bound
2147 because the type may change after first binding, through
2148 being completed or through attributes being added. If we
2149 encounter multiple such decls, only the first should have
2150 its type saved; the others will already have had their
2151 proper types saved and the types will not have changed as
2152 their scopes will not have been re-entered. */
2153 if (DECL_P (b
->decl
) && DECL_FILE_SCOPE_P (b
->decl
) && !type_saved
)
2155 b
->type
= TREE_TYPE (b
->decl
);
2158 if (B_IN_FILE_SCOPE (b
)
2159 && TREE_CODE (b
->decl
) == VAR_DECL
2160 && TREE_STATIC (b
->decl
)
2161 && TREE_CODE (TREE_TYPE (b
->decl
)) == ARRAY_TYPE
2162 && !TYPE_DOMAIN (TREE_TYPE (b
->decl
))
2163 && TREE_CODE (type
) == ARRAY_TYPE
2164 && TYPE_DOMAIN (type
)
2165 && TYPE_MAX_VALUE (TYPE_DOMAIN (type
))
2166 && !integer_zerop (TYPE_MAX_VALUE (TYPE_DOMAIN (type
))))
2168 /* Array type completed in inner scope, which should be
2169 diagnosed if the completion does not have size 1 and
2170 it does not get completed in the file scope. */
2171 b
->inner_comp
= true;
2176 /* If a matching external declaration has been found, set its
2177 type to the composite of all the types of that declaration.
2178 After the consistency checks, it will be reset to the
2179 composite of the visible types only. */
2180 if (b
&& (TREE_PUBLIC (x
) || same_translation_unit_p (x
, b
->decl
))
2182 TREE_TYPE (b
->decl
) = b
->type
;
2184 /* The point of the same_translation_unit_p check here is,
2185 we want to detect a duplicate decl for a construct like
2186 foo() { extern bar(); } ... static bar(); but not if
2187 they are in different translation units. In any case,
2188 the static does not go in the externals scope. */
2190 && (TREE_PUBLIC (x
) || same_translation_unit_p (x
, b
->decl
))
2191 && duplicate_decls (x
, b
->decl
))
2196 if (comptypes (vistype
, type
))
2197 thistype
= composite_type (vistype
, type
);
2199 thistype
= TREE_TYPE (b
->decl
);
2203 b
->type
= TREE_TYPE (b
->decl
);
2204 if (TREE_CODE (b
->decl
) == FUNCTION_DECL
&& DECL_BUILT_IN (b
->decl
))
2206 = build_type_attribute_variant (thistype
,
2207 TYPE_ATTRIBUTES (b
->type
));
2208 TREE_TYPE (b
->decl
) = thistype
;
2209 bind (name
, b
->decl
, scope
, /*invisible=*/false, /*nested=*/true,
2213 else if (TREE_PUBLIC (x
))
2215 if (visdecl
&& !b
&& duplicate_decls (x
, visdecl
))
2217 /* An external declaration at block scope referring to a
2218 visible entity with internal linkage. The composite
2219 type will already be correct for this scope, so we
2220 just need to fall through to make the declaration in
2227 bind (name
, x
, external_scope
, /*invisible=*/true,
2228 /*nested=*/false, locus
);
2234 if (TREE_CODE (x
) != PARM_DECL
)
2235 warn_if_shadowing (x
);
2237 skip_external_and_shadow_checks
:
2238 if (TREE_CODE (x
) == TYPE_DECL
)
2239 set_underlying_type (x
);
2241 bind (name
, x
, scope
, /*invisible=*/false, nested
, locus
);
2243 /* If x's type is incomplete because it's based on a
2244 structure or union which has not yet been fully declared,
2245 attach it to that structure or union type, so we can go
2246 back and complete the variable declaration later, if the
2247 structure or union gets fully declared.
2249 If the input is erroneous, we can have error_mark in the type
2250 slot (e.g. "f(void a, ...)") - that doesn't count as an
2252 if (TREE_TYPE (x
) != error_mark_node
2253 && !COMPLETE_TYPE_P (TREE_TYPE (x
)))
2255 tree element
= TREE_TYPE (x
);
2257 while (TREE_CODE (element
) == ARRAY_TYPE
)
2258 element
= TREE_TYPE (element
);
2259 element
= TYPE_MAIN_VARIANT (element
);
2261 if ((TREE_CODE (element
) == RECORD_TYPE
2262 || TREE_CODE (element
) == UNION_TYPE
)
2263 && (TREE_CODE (x
) != TYPE_DECL
2264 || TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
)
2265 && !COMPLETE_TYPE_P (element
))
2266 C_TYPE_INCOMPLETE_VARS (element
)
2267 = tree_cons (NULL_TREE
, x
, C_TYPE_INCOMPLETE_VARS (element
));
2272 /* Record X as belonging to file scope.
2273 This is used only internally by the Objective-C front end,
2274 and is limited to its needs. duplicate_decls is not called;
2275 if there is any preexisting decl for this identifier, it is an ICE. */
2278 pushdecl_top_level (tree x
)
2281 bool nested
= false;
2282 gcc_assert (TREE_CODE (x
) == VAR_DECL
|| TREE_CODE (x
) == CONST_DECL
);
2284 name
= DECL_NAME (x
);
2286 gcc_assert (TREE_CODE (x
) == CONST_DECL
|| !I_SYMBOL_BINDING (name
));
2288 if (TREE_PUBLIC (x
))
2290 bind (name
, x
, external_scope
, /*invisible=*/true, /*nested=*/false,
2295 bind (name
, x
, file_scope
, /*invisible=*/false, nested
, UNKNOWN_LOCATION
);
2301 implicit_decl_warning (tree id
, tree olddecl
)
2303 if (warn_implicit_function_declaration
)
2308 warned
= pedwarn (input_location
, OPT_Wimplicit_function_declaration
,
2309 "implicit declaration of function %qE", id
);
2311 warned
= warning (OPT_Wimplicit_function_declaration
,
2312 G_("implicit declaration of function %qE"), id
);
2313 if (olddecl
&& warned
)
2314 locate_old_decl (olddecl
);
2318 /* Generate an implicit declaration for identifier FUNCTIONID as a
2319 function of type int (). */
2322 implicitly_declare (tree functionid
)
2324 struct c_binding
*b
;
2328 for (b
= I_SYMBOL_BINDING (functionid
); b
; b
= b
->shadowed
)
2330 if (B_IN_SCOPE (b
, external_scope
))
2339 if (decl
== error_mark_node
)
2342 /* FIXME: Objective-C has weird not-really-builtin functions
2343 which are supposed to be visible automatically. They wind up
2344 in the external scope because they're pushed before the file
2345 scope gets created. Catch this here and rebind them into the
2347 if (!DECL_BUILT_IN (decl
) && DECL_IS_BUILTIN (decl
))
2349 bind (functionid
, decl
, file_scope
,
2350 /*invisible=*/false, /*nested=*/true,
2351 DECL_SOURCE_LOCATION (decl
));
2356 tree newtype
= default_function_type
;
2358 TREE_TYPE (decl
) = b
->type
;
2359 /* Implicit declaration of a function already declared
2360 (somehow) in a different scope, or as a built-in.
2361 If this is the first time this has happened, warn;
2362 then recycle the old declaration but with the new type. */
2363 if (!C_DECL_IMPLICIT (decl
))
2365 implicit_decl_warning (functionid
, decl
);
2366 C_DECL_IMPLICIT (decl
) = 1;
2368 if (DECL_BUILT_IN (decl
))
2370 newtype
= build_type_attribute_variant (newtype
,
2372 (TREE_TYPE (decl
)));
2373 if (!comptypes (newtype
, TREE_TYPE (decl
)))
2375 warning (0, "incompatible implicit declaration of built-in"
2376 " function %qD", decl
);
2377 newtype
= TREE_TYPE (decl
);
2382 if (!comptypes (newtype
, TREE_TYPE (decl
)))
2384 error ("incompatible implicit declaration of function %qD",
2386 locate_old_decl (decl
);
2389 b
->type
= TREE_TYPE (decl
);
2390 TREE_TYPE (decl
) = newtype
;
2391 bind (functionid
, decl
, current_scope
,
2392 /*invisible=*/false, /*nested=*/true,
2393 DECL_SOURCE_LOCATION (decl
));
2398 /* Not seen before. */
2399 decl
= build_decl (FUNCTION_DECL
, functionid
, default_function_type
);
2400 DECL_EXTERNAL (decl
) = 1;
2401 TREE_PUBLIC (decl
) = 1;
2402 C_DECL_IMPLICIT (decl
) = 1;
2403 implicit_decl_warning (functionid
, 0);
2404 asmspec_tree
= maybe_apply_renaming_pragma (decl
, /*asmname=*/NULL
);
2406 set_user_assembler_name (decl
, TREE_STRING_POINTER (asmspec_tree
));
2408 /* C89 says implicit declarations are in the innermost block.
2409 So we record the decl in the standard fashion. */
2410 decl
= pushdecl (decl
);
2412 /* No need to call objc_check_decl here - it's a function type. */
2413 rest_of_decl_compilation (decl
, 0, 0);
2415 /* Write a record describing this implicit function declaration
2416 to the prototypes file (if requested). */
2417 gen_aux_info_record (decl
, 0, 1, 0);
2419 /* Possibly apply some default attributes to this implicit declaration. */
2420 decl_attributes (&decl
, NULL_TREE
, 0);
2425 /* Issue an error message for a reference to an undeclared variable
2426 ID, including a reference to a builtin outside of function-call
2427 context. Establish a binding of the identifier to error_mark_node
2428 in an appropriate scope, which will suppress further errors for the
2429 same identifier. The error message should be given location LOC. */
2431 undeclared_variable (tree id
, location_t loc
)
2433 static bool already
= false;
2434 struct c_scope
*scope
;
2436 if (current_function_decl
== 0)
2438 error ("%H%qE undeclared here (not in a function)", &loc
, id
);
2439 scope
= current_scope
;
2443 error ("%H%qE undeclared (first use in this function)", &loc
, id
);
2447 error ("%H(Each undeclared identifier is reported only once", &loc
);
2448 error ("%Hfor each function it appears in.)", &loc
);
2452 /* If we are parsing old-style parameter decls, current_function_decl
2453 will be nonnull but current_function_scope will be null. */
2454 scope
= current_function_scope
? current_function_scope
: current_scope
;
2456 bind (id
, error_mark_node
, scope
, /*invisible=*/false, /*nested=*/false,
2460 /* Subroutine of lookup_label, declare_label, define_label: construct a
2461 LABEL_DECL with all the proper frills. */
2464 make_label (tree name
, location_t location
)
2466 tree label
= build_decl (LABEL_DECL
, name
, void_type_node
);
2468 DECL_CONTEXT (label
) = current_function_decl
;
2469 DECL_MODE (label
) = VOIDmode
;
2470 DECL_SOURCE_LOCATION (label
) = location
;
2475 /* Get the LABEL_DECL corresponding to identifier NAME as a label.
2476 Create one if none exists so far for the current function.
2477 This is called when a label is used in a goto expression or
2478 has its address taken. */
2481 lookup_label (tree name
)
2485 if (current_function_decl
== 0)
2487 error ("label %qE referenced outside of any function", name
);
2491 /* Use a label already defined or ref'd with this name, but not if
2492 it is inherited from a containing function and wasn't declared
2494 label
= I_LABEL_DECL (name
);
2495 if (label
&& (DECL_CONTEXT (label
) == current_function_decl
2496 || C_DECLARED_LABEL_FLAG (label
)))
2498 /* If the label has only been declared, update its apparent
2499 location to point here, for better diagnostics if it
2500 turns out not to have been defined. */
2501 if (!TREE_USED (label
))
2502 DECL_SOURCE_LOCATION (label
) = input_location
;
2506 /* No label binding for that identifier; make one. */
2507 label
= make_label (name
, input_location
);
2509 /* Ordinary labels go in the current function scope. */
2510 bind (name
, label
, current_function_scope
,
2511 /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION
);
2515 /* Make a label named NAME in the current function, shadowing silently
2516 any that may be inherited from containing functions or containing
2517 scopes. This is called for __label__ declarations. */
2520 declare_label (tree name
)
2522 struct c_binding
*b
= I_LABEL_BINDING (name
);
2525 /* Check to make sure that the label hasn't already been declared
2527 if (b
&& B_IN_CURRENT_SCOPE (b
))
2529 error ("duplicate label declaration %qE", name
);
2530 locate_old_decl (b
->decl
);
2532 /* Just use the previous declaration. */
2536 label
= make_label (name
, input_location
);
2537 C_DECLARED_LABEL_FLAG (label
) = 1;
2539 /* Declared labels go in the current scope. */
2540 bind (name
, label
, current_scope
,
2541 /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION
);
2545 /* Define a label, specifying the location in the source file.
2546 Return the LABEL_DECL node for the label, if the definition is valid.
2547 Otherwise return 0. */
2550 define_label (location_t location
, tree name
)
2552 /* Find any preexisting label with this name. It is an error
2553 if that label has already been defined in this function, or
2554 if there is a containing function with a declared label with
2556 tree label
= I_LABEL_DECL (name
);
2557 struct c_label_list
*nlist_se
, *nlist_vm
;
2560 && ((DECL_CONTEXT (label
) == current_function_decl
2561 && DECL_INITIAL (label
) != 0)
2562 || (DECL_CONTEXT (label
) != current_function_decl
2563 && C_DECLARED_LABEL_FLAG (label
))))
2565 error ("%Hduplicate label %qD", &location
, label
);
2566 locate_old_decl (label
);
2569 else if (label
&& DECL_CONTEXT (label
) == current_function_decl
)
2571 /* The label has been used or declared already in this function,
2572 but not defined. Update its location to point to this
2574 if (C_DECL_UNDEFINABLE_STMT_EXPR (label
))
2575 error ("%Jjump into statement expression", label
);
2576 if (C_DECL_UNDEFINABLE_VM (label
))
2577 error ("%Jjump into scope of identifier with variably modified type",
2579 DECL_SOURCE_LOCATION (label
) = location
;
2583 /* No label binding for that identifier; make one. */
2584 label
= make_label (name
, location
);
2586 /* Ordinary labels go in the current function scope. */
2587 bind (name
, label
, current_function_scope
,
2588 /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION
);
2591 if (!in_system_header
&& lookup_name (name
))
2592 warning (OPT_Wtraditional
, "%Htraditional C lacks a separate namespace "
2593 "for labels, identifier %qE conflicts", &location
, name
);
2595 nlist_se
= XOBNEW (&parser_obstack
, struct c_label_list
);
2596 nlist_se
->next
= label_context_stack_se
->labels_def
;
2597 nlist_se
->label
= label
;
2598 label_context_stack_se
->labels_def
= nlist_se
;
2600 nlist_vm
= XOBNEW (&parser_obstack
, struct c_label_list
);
2601 nlist_vm
->next
= label_context_stack_vm
->labels_def
;
2602 nlist_vm
->label
= label
;
2603 label_context_stack_vm
->labels_def
= nlist_vm
;
2605 /* Mark label as having been defined. */
2606 DECL_INITIAL (label
) = error_mark_node
;
2610 /* Given NAME, an IDENTIFIER_NODE,
2611 return the structure (or union or enum) definition for that name.
2612 If THISLEVEL_ONLY is nonzero, searches only the current_scope.
2613 CODE says which kind of type the caller wants;
2614 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2615 If the wrong kind of type is found, an error is reported. */
2618 lookup_tag (enum tree_code code
, tree name
, int thislevel_only
)
2620 struct c_binding
*b
= I_TAG_BINDING (name
);
2626 /* We only care about whether it's in this level if
2627 thislevel_only was set or it might be a type clash. */
2628 if (thislevel_only
|| TREE_CODE (b
->decl
) != code
)
2630 /* For our purposes, a tag in the external scope is the same as
2631 a tag in the file scope. (Primarily relevant to Objective-C
2632 and its builtin structure tags, which get pushed before the
2633 file scope is created.) */
2634 if (B_IN_CURRENT_SCOPE (b
)
2635 || (current_scope
== file_scope
&& B_IN_EXTERNAL_SCOPE (b
)))
2639 if (thislevel_only
&& !thislevel
)
2642 if (TREE_CODE (b
->decl
) != code
)
2644 /* Definition isn't the kind we were looking for. */
2645 pending_invalid_xref
= name
;
2646 pending_invalid_xref_location
= input_location
;
2648 /* If in the same binding level as a declaration as a tag
2649 of a different type, this must not be allowed to
2650 shadow that tag, so give the error immediately.
2651 (For example, "struct foo; union foo;" is invalid.) */
2653 pending_xref_error ();
2658 /* Print an error message now
2659 for a recent invalid struct, union or enum cross reference.
2660 We don't print them immediately because they are not invalid
2661 when used in the `struct foo;' construct for shadowing. */
2664 pending_xref_error (void)
2666 if (pending_invalid_xref
!= 0)
2667 error ("%H%qE defined as wrong kind of tag",
2668 &pending_invalid_xref_location
, pending_invalid_xref
);
2669 pending_invalid_xref
= 0;
2673 /* Look up NAME in the current scope and its superiors
2674 in the namespace of variables, functions and typedefs.
2675 Return a ..._DECL node of some kind representing its definition,
2676 or return 0 if it is undefined. */
2679 lookup_name (tree name
)
2681 struct c_binding
*b
= I_SYMBOL_BINDING (name
);
2682 if (b
&& !b
->invisible
)
2687 /* Similar to `lookup_name' but look only at the indicated scope. */
2690 lookup_name_in_scope (tree name
, struct c_scope
*scope
)
2692 struct c_binding
*b
;
2694 for (b
= I_SYMBOL_BINDING (name
); b
; b
= b
->shadowed
)
2695 if (B_IN_SCOPE (b
, scope
))
2700 /* Create the predefined scalar types of C,
2701 and some nodes representing standard constants (0, 1, (void *) 0).
2702 Initialize the global scope.
2703 Make definitions for built-in primitive functions. */
2706 c_init_decl_processing (void)
2708 location_t save_loc
= input_location
;
2710 /* Initialize reserved words for parser. */
2713 current_function_decl
= 0;
2715 gcc_obstack_init (&parser_obstack
);
2717 /* Make the externals scope. */
2719 external_scope
= current_scope
;
2721 /* Declarations from c_common_nodes_and_builtins must not be associated
2722 with this input file, lest we get differences between using and not
2723 using preprocessed headers. */
2724 input_location
= BUILTINS_LOCATION
;
2726 build_common_tree_nodes (flag_signed_char
, false);
2728 c_common_nodes_and_builtins ();
2730 /* In C, comparisons and TRUTH_* expressions have type int. */
2731 truthvalue_type_node
= integer_type_node
;
2732 truthvalue_true_node
= integer_one_node
;
2733 truthvalue_false_node
= integer_zero_node
;
2735 /* Even in C99, which has a real boolean type. */
2736 pushdecl (build_decl (TYPE_DECL
, get_identifier ("_Bool"),
2737 boolean_type_node
));
2739 input_location
= save_loc
;
2741 pedantic_lvalues
= true;
2743 make_fname_decl
= c_make_fname_decl
;
2744 start_fname_decls ();
2747 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
2748 decl, NAME is the initialization string and TYPE_DEP indicates whether
2749 NAME depended on the type of the function. As we don't yet implement
2750 delayed emission of static data, we mark the decl as emitted
2751 so it is not placed in the output. Anything using it must therefore pull
2752 out the STRING_CST initializer directly. FIXME. */
2755 c_make_fname_decl (tree id
, int type_dep
)
2757 const char *name
= fname_as_string (type_dep
);
2758 tree decl
, type
, init
;
2759 size_t length
= strlen (name
);
2761 type
= build_array_type (char_type_node
,
2762 build_index_type (size_int (length
)));
2763 type
= c_build_qualified_type (type
, TYPE_QUAL_CONST
);
2765 decl
= build_decl (VAR_DECL
, id
, type
);
2767 TREE_STATIC (decl
) = 1;
2768 TREE_READONLY (decl
) = 1;
2769 DECL_ARTIFICIAL (decl
) = 1;
2771 init
= build_string (length
+ 1, name
);
2772 free (CONST_CAST (char *, name
));
2773 TREE_TYPE (init
) = type
;
2774 DECL_INITIAL (decl
) = init
;
2776 TREE_USED (decl
) = 1;
2778 if (current_function_decl
2779 /* For invalid programs like this:
2782 const char* p = __FUNCTION__;
2784 the __FUNCTION__ is believed to appear in K&R style function
2785 parameter declarator. In that case we still don't have
2787 && (!errorcount
|| current_function_scope
))
2789 DECL_CONTEXT (decl
) = current_function_decl
;
2790 bind (id
, decl
, current_function_scope
,
2791 /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION
);
2794 finish_decl (decl
, init
, NULL_TREE
);
2800 c_builtin_function (tree decl
)
2802 tree type
= TREE_TYPE (decl
);
2803 tree id
= DECL_NAME (decl
);
2805 const char *name
= IDENTIFIER_POINTER (id
);
2806 C_DECL_BUILTIN_PROTOTYPE (decl
) = (TYPE_ARG_TYPES (type
) != 0);
2808 /* Should never be called on a symbol with a preexisting meaning. */
2809 gcc_assert (!I_SYMBOL_BINDING (id
));
2811 bind (id
, decl
, external_scope
, /*invisible=*/true, /*nested=*/false,
2814 /* Builtins in the implementation namespace are made visible without
2815 needing to be explicitly declared. See push_file_scope. */
2816 if (name
[0] == '_' && (name
[1] == '_' || ISUPPER (name
[1])))
2818 TREE_CHAIN (decl
) = visible_builtins
;
2819 visible_builtins
= decl
;
2826 c_builtin_function_ext_scope (tree decl
)
2828 tree type
= TREE_TYPE (decl
);
2829 tree id
= DECL_NAME (decl
);
2831 const char *name
= IDENTIFIER_POINTER (id
);
2832 C_DECL_BUILTIN_PROTOTYPE (decl
) = (TYPE_ARG_TYPES (type
) != 0);
2834 /* Should never be called on a symbol with a preexisting meaning. */
2835 gcc_assert (!I_SYMBOL_BINDING (id
));
2837 bind (id
, decl
, external_scope
, /*invisible=*/false, /*nested=*/false,
2840 /* Builtins in the implementation namespace are made visible without
2841 needing to be explicitly declared. See push_file_scope. */
2842 if (name
[0] == '_' && (name
[1] == '_' || ISUPPER (name
[1])))
2844 TREE_CHAIN (decl
) = visible_builtins
;
2845 visible_builtins
= decl
;
2851 /* Called when a declaration is seen that contains no names to declare.
2852 If its type is a reference to a structure, union or enum inherited
2853 from a containing scope, shadow that tag name for the current scope
2854 with a forward reference.
2855 If its type defines a new named structure or union
2856 or defines an enum, it is valid but we need not do anything here.
2857 Otherwise, it is an error. */
2860 shadow_tag (const struct c_declspecs
*declspecs
)
2862 shadow_tag_warned (declspecs
, 0);
2865 /* WARNED is 1 if we have done a pedwarn, 2 if we have done a warning,
2868 shadow_tag_warned (const struct c_declspecs
*declspecs
, int warned
)
2870 bool found_tag
= false;
2872 if (declspecs
->type
&& !declspecs
->default_int_p
&& !declspecs
->typedef_p
)
2874 tree value
= declspecs
->type
;
2875 enum tree_code code
= TREE_CODE (value
);
2877 if (code
== RECORD_TYPE
|| code
== UNION_TYPE
|| code
== ENUMERAL_TYPE
)
2878 /* Used to test also that TYPE_SIZE (value) != 0.
2879 That caused warning for `struct foo;' at top level in the file. */
2881 tree name
= TYPE_NAME (value
);
2888 if (warned
!= 1 && code
!= ENUMERAL_TYPE
)
2889 /* Empty unnamed enum OK */
2891 pedwarn (input_location
, 0,
2892 "unnamed struct/union that defines no instances");
2896 else if (!declspecs
->tag_defined_p
2897 && declspecs
->storage_class
!= csc_none
)
2900 pedwarn (input_location
, 0,
2901 "empty declaration with storage class specifier "
2902 "does not redeclare tag");
2904 pending_xref_error ();
2906 else if (!declspecs
->tag_defined_p
2907 && (declspecs
->const_p
2908 || declspecs
->volatile_p
2909 || declspecs
->restrict_p
))
2912 pedwarn (input_location
, 0,
2913 "empty declaration with type qualifier "
2914 "does not redeclare tag");
2916 pending_xref_error ();
2920 pending_invalid_xref
= 0;
2921 t
= lookup_tag (code
, name
, 1);
2925 t
= make_node (code
);
2932 if (warned
!= 1 && !in_system_header
)
2934 pedwarn (input_location
, 0,
2935 "useless type name in empty declaration");
2940 else if (warned
!= 1 && !in_system_header
&& declspecs
->typedef_p
)
2942 pedwarn (input_location
, 0, "useless type name in empty declaration");
2946 pending_invalid_xref
= 0;
2948 if (declspecs
->inline_p
)
2950 error ("%<inline%> in empty declaration");
2954 if (current_scope
== file_scope
&& declspecs
->storage_class
== csc_auto
)
2956 error ("%<auto%> in file-scope empty declaration");
2960 if (current_scope
== file_scope
&& declspecs
->storage_class
== csc_register
)
2962 error ("%<register%> in file-scope empty declaration");
2966 if (!warned
&& !in_system_header
&& declspecs
->storage_class
!= csc_none
)
2968 warning (0, "useless storage class specifier in empty declaration");
2972 if (!warned
&& !in_system_header
&& declspecs
->thread_p
)
2974 warning (0, "useless %<__thread%> in empty declaration");
2978 if (!warned
&& !in_system_header
&& (declspecs
->const_p
2979 || declspecs
->volatile_p
2980 || declspecs
->restrict_p
))
2982 warning (0, "useless type qualifier in empty declaration");
2989 pedwarn (input_location
, 0, "empty declaration");
2994 /* Return the qualifiers from SPECS as a bitwise OR of TYPE_QUAL_*
2995 bits. SPECS represents declaration specifiers that the grammar
2996 only permits to contain type qualifiers and attributes. */
2999 quals_from_declspecs (const struct c_declspecs
*specs
)
3001 int quals
= ((specs
->const_p
? TYPE_QUAL_CONST
: 0)
3002 | (specs
->volatile_p
? TYPE_QUAL_VOLATILE
: 0)
3003 | (specs
->restrict_p
? TYPE_QUAL_RESTRICT
: 0));
3004 gcc_assert (!specs
->type
3005 && !specs
->decl_attr
3006 && specs
->typespec_word
== cts_none
3007 && specs
->storage_class
== csc_none
3008 && !specs
->typedef_p
3009 && !specs
->explicit_signed_p
3010 && !specs
->deprecated_p
3012 && !specs
->long_long_p
3015 && !specs
->unsigned_p
3016 && !specs
->complex_p
3018 && !specs
->thread_p
);
3022 /* Construct an array declarator. EXPR is the expression inside [],
3023 or NULL_TREE. QUALS are the type qualifiers inside the [] (to be
3024 applied to the pointer to which a parameter array is converted).
3025 STATIC_P is true if "static" is inside the [], false otherwise.
3026 VLA_UNSPEC_P is true if the array is [*], a VLA of unspecified
3027 length which is nevertheless a complete type, false otherwise. The
3028 field for the contained declarator is left to be filled in by
3029 set_array_declarator_inner. */
3031 struct c_declarator
*
3032 build_array_declarator (tree expr
, struct c_declspecs
*quals
, bool static_p
,
3035 struct c_declarator
*declarator
= XOBNEW (&parser_obstack
,
3036 struct c_declarator
);
3037 declarator
->kind
= cdk_array
;
3038 declarator
->declarator
= 0;
3039 declarator
->u
.array
.dimen
= expr
;
3042 declarator
->u
.array
.attrs
= quals
->attrs
;
3043 declarator
->u
.array
.quals
= quals_from_declspecs (quals
);
3047 declarator
->u
.array
.attrs
= NULL_TREE
;
3048 declarator
->u
.array
.quals
= 0;
3050 declarator
->u
.array
.static_p
= static_p
;
3051 declarator
->u
.array
.vla_unspec_p
= vla_unspec_p
;
3054 if (static_p
|| quals
!= NULL
)
3055 pedwarn (input_location
, OPT_pedantic
,
3056 "ISO C90 does not support %<static%> or type "
3057 "qualifiers in parameter array declarators");
3059 pedwarn (input_location
, OPT_pedantic
,
3060 "ISO C90 does not support %<[*]%> array declarators");
3064 if (!current_scope
->parm_flag
)
3067 error ("%<[*]%> not allowed in other than function prototype scope");
3068 declarator
->u
.array
.vla_unspec_p
= false;
3071 current_scope
->had_vla_unspec
= true;
3076 /* Set the contained declarator of an array declarator. DECL is the
3077 declarator, as constructed by build_array_declarator; INNER is what
3078 appears on the left of the []. */
3080 struct c_declarator
*
3081 set_array_declarator_inner (struct c_declarator
*decl
,
3082 struct c_declarator
*inner
)
3084 decl
->declarator
= inner
;
3088 /* INIT is a constructor that forms DECL's initializer. If the final
3089 element initializes a flexible array field, add the size of that
3090 initializer to DECL's size. */
3093 add_flexible_array_elts_to_size (tree decl
, tree init
)
3097 if (VEC_empty (constructor_elt
, CONSTRUCTOR_ELTS (init
)))
3100 elt
= VEC_last (constructor_elt
, CONSTRUCTOR_ELTS (init
))->value
;
3101 type
= TREE_TYPE (elt
);
3102 if (TREE_CODE (type
) == ARRAY_TYPE
3103 && TYPE_SIZE (type
) == NULL_TREE
3104 && TYPE_DOMAIN (type
) != NULL_TREE
3105 && TYPE_MAX_VALUE (TYPE_DOMAIN (type
)) == NULL_TREE
)
3107 complete_array_type (&type
, elt
, false);
3109 = size_binop (PLUS_EXPR
, DECL_SIZE (decl
), TYPE_SIZE (type
));
3110 DECL_SIZE_UNIT (decl
)
3111 = size_binop (PLUS_EXPR
, DECL_SIZE_UNIT (decl
), TYPE_SIZE_UNIT (type
));
3115 /* Decode a "typename", such as "int **", returning a ..._TYPE node.
3116 Set *EXPR, if EXPR not NULL, to any expression to be evaluated
3117 before the type name, and set *EXPR_CONST_OPERANDS, if
3118 EXPR_CONST_OPERANDS not NULL, to indicate whether the type name may
3119 appear in a constant expression. */
3122 groktypename (struct c_type_name
*type_name
, tree
*expr
,
3123 bool *expr_const_operands
)
3126 tree attrs
= type_name
->specs
->attrs
;
3128 type_name
->specs
->attrs
= NULL_TREE
;
3130 type
= grokdeclarator (type_name
->declarator
, type_name
->specs
, TYPENAME
,
3131 false, NULL
, &attrs
, expr
, expr_const_operands
,
3134 /* Apply attributes. */
3135 decl_attributes (&type
, attrs
, 0);
3140 /* Decode a declarator in an ordinary declaration or data definition.
3141 This is called as soon as the type information and variable name
3142 have been parsed, before parsing the initializer if any.
3143 Here we create the ..._DECL node, fill in its type,
3144 and put it on the list of decls for the current context.
3145 The ..._DECL node is returned as the value.
3147 Exception: for arrays where the length is not specified,
3148 the type is left null, to be filled in by `finish_decl'.
3150 Function definitions do not come here; they go to start_function
3151 instead. However, external and forward declarations of functions
3152 do go through here. Structure field declarations are done by
3153 grokfield and not through here. */
3156 start_decl (struct c_declarator
*declarator
, struct c_declspecs
*declspecs
,
3157 bool initialized
, tree attributes
)
3161 tree expr
= NULL_TREE
;
3162 enum deprecated_states deprecated_state
= DEPRECATED_NORMAL
;
3164 /* An object declared as __attribute__((deprecated)) suppresses
3165 warnings of uses of other deprecated items. */
3166 if (lookup_attribute ("deprecated", attributes
))
3167 deprecated_state
= DEPRECATED_SUPPRESS
;
3169 decl
= grokdeclarator (declarator
, declspecs
,
3170 NORMAL
, initialized
, NULL
, &attributes
, &expr
, NULL
,
3178 if (TREE_CODE (decl
) != FUNCTION_DECL
&& MAIN_NAME_P (DECL_NAME (decl
)))
3179 warning (OPT_Wmain
, "%q+D is usually a function", decl
);
3182 /* Is it valid for this decl to have an initializer at all?
3183 If not, set INITIALIZED to zero, which will indirectly
3184 tell 'finish_decl' to ignore the initializer once it is parsed. */
3185 switch (TREE_CODE (decl
))
3188 error ("typedef %qD is initialized (use __typeof__ instead)", decl
);
3193 error ("function %qD is initialized like a variable", decl
);
3198 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3199 error ("parameter %qD is initialized", decl
);
3204 /* Don't allow initializations for incomplete types except for
3205 arrays which might be completed by the initialization. */
3207 /* This can happen if the array size is an undefined macro.
3208 We already gave a warning, so we don't need another one. */
3209 if (TREE_TYPE (decl
) == error_mark_node
)
3211 else if (COMPLETE_TYPE_P (TREE_TYPE (decl
)))
3213 /* A complete type is ok if size is fixed. */
3215 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl
))) != INTEGER_CST
3216 || C_DECL_VARIABLE_SIZE (decl
))
3218 error ("variable-sized object may not be initialized");
3222 else if (TREE_CODE (TREE_TYPE (decl
)) != ARRAY_TYPE
)
3224 error ("variable %qD has initializer but incomplete type", decl
);
3227 else if (C_DECL_VARIABLE_SIZE (decl
))
3229 /* Although C99 is unclear about whether incomplete arrays
3230 of VLAs themselves count as VLAs, it does not make
3231 sense to permit them to be initialized given that
3232 ordinary VLAs may not be initialized. */
3233 error ("variable-sized object may not be initialized");
3240 if (current_scope
== file_scope
)
3241 TREE_STATIC (decl
) = 1;
3243 /* Tell 'pushdecl' this is an initialized decl
3244 even though we don't yet have the initializer expression.
3245 Also tell 'finish_decl' it may store the real initializer. */
3246 DECL_INITIAL (decl
) = error_mark_node
;
3249 /* If this is a function declaration, write a record describing it to the
3250 prototypes file (if requested). */
3252 if (TREE_CODE (decl
) == FUNCTION_DECL
)
3253 gen_aux_info_record (decl
, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl
)) != 0);
3255 /* ANSI specifies that a tentative definition which is not merged with
3256 a non-tentative definition behaves exactly like a definition with an
3257 initializer equal to zero. (Section 3.7.2)
3259 -fno-common gives strict ANSI behavior, though this tends to break
3260 a large body of code that grew up without this rule.
3262 Thread-local variables are never common, since there's no entrenched
3263 body of code to break, and it allows more efficient variable references
3264 in the presence of dynamic linking. */
3266 if (TREE_CODE (decl
) == VAR_DECL
3268 && TREE_PUBLIC (decl
)
3269 && !DECL_THREAD_LOCAL_P (decl
)
3271 DECL_COMMON (decl
) = 1;
3273 /* Set attributes here so if duplicate decl, will have proper attributes. */
3274 decl_attributes (&decl
, attributes
, 0);
3276 /* Handle gnu_inline attribute. */
3277 if (declspecs
->inline_p
3278 && !flag_gnu89_inline
3279 && TREE_CODE (decl
) == FUNCTION_DECL
3280 && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl
))
3281 || current_function_decl
))
3283 if (declspecs
->storage_class
== csc_auto
&& current_scope
!= file_scope
)
3285 else if (declspecs
->storage_class
!= csc_static
)
3286 DECL_EXTERNAL (decl
) = !DECL_EXTERNAL (decl
);
3289 if (TREE_CODE (decl
) == FUNCTION_DECL
3290 && targetm
.calls
.promote_prototypes (TREE_TYPE (decl
)))
3292 struct c_declarator
*ce
= declarator
;
3294 if (ce
->kind
== cdk_pointer
)
3295 ce
= declarator
->declarator
;
3296 if (ce
->kind
== cdk_function
)
3298 tree args
= ce
->u
.arg_info
->parms
;
3299 for (; args
; args
= TREE_CHAIN (args
))
3301 tree type
= TREE_TYPE (args
);
3302 if (type
&& INTEGRAL_TYPE_P (type
)
3303 && TYPE_PRECISION (type
) < TYPE_PRECISION (integer_type_node
))
3304 DECL_ARG_TYPE (args
) = integer_type_node
;
3309 if (TREE_CODE (decl
) == FUNCTION_DECL
3310 && DECL_DECLARED_INLINE_P (decl
)
3311 && DECL_UNINLINABLE (decl
)
3312 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl
)))
3313 warning (OPT_Wattributes
, "inline function %q+D given attribute noinline",
3316 /* C99 6.7.4p3: An inline definition of a function with external
3317 linkage shall not contain a definition of a modifiable object
3318 with static storage duration... */
3319 if (TREE_CODE (decl
) == VAR_DECL
3320 && current_scope
!= file_scope
3321 && TREE_STATIC (decl
)
3322 && !TREE_READONLY (decl
)
3323 && DECL_DECLARED_INLINE_P (current_function_decl
)
3324 && DECL_EXTERNAL (current_function_decl
))
3325 pedwarn (input_location
, 0,
3326 "%q+D is static but declared in inline function %qD "
3327 "which is not static", decl
, current_function_decl
);
3329 /* Add this decl to the current scope.
3330 TEM may equal DECL or it may be a previous decl of the same name. */
3331 tem
= pushdecl (decl
);
3333 if (initialized
&& DECL_EXTERNAL (tem
))
3335 DECL_EXTERNAL (tem
) = 0;
3336 TREE_STATIC (tem
) = 1;
3342 /* Initialize EH if not initialized yet and exceptions are enabled. */
3345 c_maybe_initialize_eh (void)
3347 if (!flag_exceptions
|| c_eh_initialized_p
)
3350 c_eh_initialized_p
= true;
3351 eh_personality_libfunc
3352 = init_one_libfunc (USING_SJLJ_EXCEPTIONS
3353 ? "__gcc_personality_sj0"
3354 : "__gcc_personality_v0");
3355 default_init_unwind_resume_libfunc ();
3356 using_eh_for_cleanups ();
3359 /* Finish processing of a declaration;
3360 install its initial value.
3361 If the length of an array type is not known before,
3362 it must be determined now, from the initial value, or it is an error. */
3365 finish_decl (tree decl
, tree init
, tree asmspec_tree
)
3368 int was_incomplete
= (DECL_SIZE (decl
) == 0);
3369 const char *asmspec
= 0;
3371 /* If a name was specified, get the string. */
3372 if ((TREE_CODE (decl
) == FUNCTION_DECL
|| TREE_CODE (decl
) == VAR_DECL
)
3373 && DECL_FILE_SCOPE_P (decl
))
3374 asmspec_tree
= maybe_apply_renaming_pragma (decl
, asmspec_tree
);
3376 asmspec
= TREE_STRING_POINTER (asmspec_tree
);
3378 /* If `start_decl' didn't like having an initialization, ignore it now. */
3379 if (init
!= 0 && DECL_INITIAL (decl
) == 0)
3382 /* Don't crash if parm is initialized. */
3383 if (TREE_CODE (decl
) == PARM_DECL
)
3387 store_init_value (decl
, init
);
3389 if (c_dialect_objc () && (TREE_CODE (decl
) == VAR_DECL
3390 || TREE_CODE (decl
) == FUNCTION_DECL
3391 || TREE_CODE (decl
) == FIELD_DECL
))
3392 objc_check_decl (decl
);
3394 type
= TREE_TYPE (decl
);
3396 /* Deduce size of array from initialization, if not already known. */
3397 if (TREE_CODE (type
) == ARRAY_TYPE
3398 && TYPE_DOMAIN (type
) == 0
3399 && TREE_CODE (decl
) != TYPE_DECL
)
3402 = (TREE_STATIC (decl
)
3403 /* Even if pedantic, an external linkage array
3404 may have incomplete type at first. */
3405 ? pedantic
&& !TREE_PUBLIC (decl
)
3406 : !DECL_EXTERNAL (decl
));
3408 = complete_array_type (&TREE_TYPE (decl
), DECL_INITIAL (decl
),
3411 /* Get the completed type made by complete_array_type. */
3412 type
= TREE_TYPE (decl
);
3417 error ("initializer fails to determine size of %q+D", decl
);
3422 error ("array size missing in %q+D", decl
);
3423 /* If a `static' var's size isn't known,
3424 make it extern as well as static, so it does not get
3426 If it is not `static', then do not mark extern;
3427 finish_incomplete_decl will give it a default size
3428 and it will get allocated. */
3429 else if (!pedantic
&& TREE_STATIC (decl
) && !TREE_PUBLIC (decl
))
3430 DECL_EXTERNAL (decl
) = 1;
3434 error ("zero or negative size array %q+D", decl
);
3438 /* For global variables, update the copy of the type that
3439 exists in the binding. */
3440 if (TREE_PUBLIC (decl
))
3442 struct c_binding
*b_ext
= I_SYMBOL_BINDING (DECL_NAME (decl
));
3443 while (b_ext
&& !B_IN_EXTERNAL_SCOPE (b_ext
))
3444 b_ext
= b_ext
->shadowed
;
3448 b_ext
->type
= composite_type (b_ext
->type
, type
);
3459 if (DECL_INITIAL (decl
))
3460 TREE_TYPE (DECL_INITIAL (decl
)) = type
;
3462 layout_decl (decl
, 0);
3465 if (TREE_CODE (decl
) == VAR_DECL
)
3467 if (init
&& TREE_CODE (init
) == CONSTRUCTOR
)
3468 add_flexible_array_elts_to_size (decl
, init
);
3470 if (DECL_SIZE (decl
) == 0 && TREE_TYPE (decl
) != error_mark_node
3471 && COMPLETE_TYPE_P (TREE_TYPE (decl
)))
3472 layout_decl (decl
, 0);
3474 if (DECL_SIZE (decl
) == 0
3475 /* Don't give an error if we already gave one earlier. */
3476 && TREE_TYPE (decl
) != error_mark_node
3477 && (TREE_STATIC (decl
)
3478 /* A static variable with an incomplete type
3479 is an error if it is initialized.
3480 Also if it is not file scope.
3481 Otherwise, let it through, but if it is not `extern'
3482 then it may cause an error message later. */
3483 ? (DECL_INITIAL (decl
) != 0
3484 || !DECL_FILE_SCOPE_P (decl
))
3485 /* An automatic variable with an incomplete type
3487 : !DECL_EXTERNAL (decl
)))
3489 error ("storage size of %q+D isn%'t known", decl
);
3490 TREE_TYPE (decl
) = error_mark_node
;
3493 if ((DECL_EXTERNAL (decl
) || TREE_STATIC (decl
))
3494 && DECL_SIZE (decl
) != 0)
3496 if (TREE_CODE (DECL_SIZE (decl
)) == INTEGER_CST
)
3497 constant_expression_warning (DECL_SIZE (decl
));
3500 error ("storage size of %q+D isn%'t constant", decl
);
3501 TREE_TYPE (decl
) = error_mark_node
;
3505 if (TREE_USED (type
))
3506 TREE_USED (decl
) = 1;
3509 /* If this is a function and an assembler name is specified, reset DECL_RTL
3510 so we can give it its new name. Also, update built_in_decls if it
3511 was a normal built-in. */
3512 if (TREE_CODE (decl
) == FUNCTION_DECL
&& asmspec
)
3514 if (DECL_BUILT_IN_CLASS (decl
) == BUILT_IN_NORMAL
)
3515 set_builtin_user_assembler_name (decl
, asmspec
);
3516 set_user_assembler_name (decl
, asmspec
);
3519 /* If #pragma weak was used, mark the decl weak now. */
3520 maybe_apply_pragma_weak (decl
);
3522 /* Output the assembler code and/or RTL code for variables and functions,
3523 unless the type is an undefined structure or union.
3524 If not, it will get done when the type is completed. */
3526 if (TREE_CODE (decl
) == VAR_DECL
|| TREE_CODE (decl
) == FUNCTION_DECL
)
3528 /* Determine the ELF visibility. */
3529 if (TREE_PUBLIC (decl
))
3530 c_determine_visibility (decl
);
3532 /* This is a no-op in c-lang.c or something real in objc-act.c. */
3533 if (c_dialect_objc ())
3534 objc_check_decl (decl
);
3538 /* If this is not a static variable, issue a warning.
3539 It doesn't make any sense to give an ASMSPEC for an
3540 ordinary, non-register local variable. Historically,
3541 GCC has accepted -- but ignored -- the ASMSPEC in
3543 if (!DECL_FILE_SCOPE_P (decl
)
3544 && TREE_CODE (decl
) == VAR_DECL
3545 && !C_DECL_REGISTER (decl
)
3546 && !TREE_STATIC (decl
))
3547 warning (0, "ignoring asm-specifier for non-static local "
3548 "variable %q+D", decl
);
3550 set_user_assembler_name (decl
, asmspec
);
3553 if (DECL_FILE_SCOPE_P (decl
))
3555 if (DECL_INITIAL (decl
) == NULL_TREE
3556 || DECL_INITIAL (decl
) == error_mark_node
)
3557 /* Don't output anything
3558 when a tentative file-scope definition is seen.
3559 But at end of compilation, do output code for them. */
3560 DECL_DEFER_OUTPUT (decl
) = 1;
3561 rest_of_decl_compilation (decl
, true, 0);
3565 /* In conjunction with an ASMSPEC, the `register'
3566 keyword indicates that we should place the variable
3567 in a particular register. */
3568 if (asmspec
&& C_DECL_REGISTER (decl
))
3570 DECL_HARD_REGISTER (decl
) = 1;
3571 /* This cannot be done for a structure with volatile
3572 fields, on which DECL_REGISTER will have been
3574 if (!DECL_REGISTER (decl
))
3575 error ("cannot put object with volatile field into register");
3578 if (TREE_CODE (decl
) != FUNCTION_DECL
)
3580 /* If we're building a variable sized type, and we might be
3581 reachable other than via the top of the current binding
3582 level, then create a new BIND_EXPR so that we deallocate
3583 the object at the right time. */
3584 /* Note that DECL_SIZE can be null due to errors. */
3585 if (DECL_SIZE (decl
)
3586 && !TREE_CONSTANT (DECL_SIZE (decl
))
3587 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list
))
3590 bind
= build3 (BIND_EXPR
, void_type_node
, NULL
, NULL
, NULL
);
3591 TREE_SIDE_EFFECTS (bind
) = 1;
3593 BIND_EXPR_BODY (bind
) = push_stmt_list ();
3595 add_stmt (build_stmt (DECL_EXPR
, decl
));
3600 if (!DECL_FILE_SCOPE_P (decl
))
3602 /* Recompute the RTL of a local array now
3603 if it used to be an incomplete type. */
3605 && !TREE_STATIC (decl
) && !DECL_EXTERNAL (decl
))
3607 /* If we used it already as memory, it must stay in memory. */
3608 TREE_ADDRESSABLE (decl
) = TREE_USED (decl
);
3609 /* If it's still incomplete now, no init will save it. */
3610 if (DECL_SIZE (decl
) == 0)
3611 DECL_INITIAL (decl
) = 0;
3616 if (TREE_CODE (decl
) == TYPE_DECL
)
3618 if (!DECL_FILE_SCOPE_P (decl
)
3619 && variably_modified_type_p (TREE_TYPE (decl
), NULL_TREE
))
3620 add_stmt (build_stmt (DECL_EXPR
, decl
));
3622 rest_of_decl_compilation (decl
, DECL_FILE_SCOPE_P (decl
), 0);
3625 /* At the end of a declaration, throw away any variable type sizes
3626 of types defined inside that declaration. There is no use
3627 computing them in the following function definition. */
3628 if (current_scope
== file_scope
)
3629 get_pending_sizes ();
3631 /* Install a cleanup (aka destructor) if one was given. */
3632 if (TREE_CODE (decl
) == VAR_DECL
&& !TREE_STATIC (decl
))
3634 tree attr
= lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl
));
3637 tree cleanup_id
= TREE_VALUE (TREE_VALUE (attr
));
3638 tree cleanup_decl
= lookup_name (cleanup_id
);
3641 /* Build "cleanup(&decl)" for the destructor. */
3642 cleanup
= build_unary_op (input_location
, ADDR_EXPR
, decl
, 0);
3643 cleanup
= build_tree_list (NULL_TREE
, cleanup
);
3644 cleanup
= build_function_call (cleanup_decl
, cleanup
);
3646 /* Don't warn about decl unused; the cleanup uses it. */
3647 TREE_USED (decl
) = 1;
3648 TREE_USED (cleanup_decl
) = 1;
3650 /* Initialize EH, if we've been told to do so. */
3651 c_maybe_initialize_eh ();
3653 push_cleanup (decl
, cleanup
, false);
3658 /* Given a parsed parameter declaration, decode it into a PARM_DECL. */
3661 grokparm (const struct c_parm
*parm
)
3663 tree attrs
= parm
->attrs
;
3664 tree decl
= grokdeclarator (parm
->declarator
, parm
->specs
, PARM
, false,
3665 NULL
, &attrs
, NULL
, NULL
, DEPRECATED_NORMAL
);
3667 decl_attributes (&decl
, attrs
, 0);
3672 /* Given a parsed parameter declaration, decode it into a PARM_DECL
3673 and push that on the current scope. */
3676 push_parm_decl (const struct c_parm
*parm
)
3678 tree attrs
= parm
->attrs
;
3681 decl
= grokdeclarator (parm
->declarator
, parm
->specs
, PARM
, false, NULL
,
3682 &attrs
, NULL
, NULL
, DEPRECATED_NORMAL
);
3683 decl_attributes (&decl
, attrs
, 0);
3685 decl
= pushdecl (decl
);
3687 finish_decl (decl
, NULL_TREE
, NULL_TREE
);
3690 /* Mark all the parameter declarations to date as forward decls.
3691 Also diagnose use of this extension. */
3694 mark_forward_parm_decls (void)
3696 struct c_binding
*b
;
3698 if (pedantic
&& !current_scope
->warned_forward_parm_decls
)
3700 pedwarn (input_location
, OPT_pedantic
,
3701 "ISO C forbids forward parameter declarations");
3702 current_scope
->warned_forward_parm_decls
= true;
3705 for (b
= current_scope
->bindings
; b
; b
= b
->prev
)
3706 if (TREE_CODE (b
->decl
) == PARM_DECL
)
3707 TREE_ASM_WRITTEN (b
->decl
) = 1;
3710 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
3711 literal, which may be an incomplete array type completed by the
3712 initializer; INIT is a CONSTRUCTOR that initializes the compound
3713 literal. NON_CONST is true if the initializers contain something
3714 that cannot occur in a constant expression. */
3717 build_compound_literal (tree type
, tree init
, bool non_const
)
3719 /* We do not use start_decl here because we have a type, not a declarator;
3720 and do not use finish_decl because the decl should be stored inside
3721 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_EXPR. */
3726 if (type
== error_mark_node
)
3727 return error_mark_node
;
3729 decl
= build_decl (VAR_DECL
, NULL_TREE
, type
);
3730 DECL_EXTERNAL (decl
) = 0;
3731 TREE_PUBLIC (decl
) = 0;
3732 TREE_STATIC (decl
) = (current_scope
== file_scope
);
3733 DECL_CONTEXT (decl
) = current_function_decl
;
3734 TREE_USED (decl
) = 1;
3735 TREE_TYPE (decl
) = type
;
3736 TREE_READONLY (decl
) = TYPE_READONLY (type
);
3737 store_init_value (decl
, init
);
3739 if (TREE_CODE (type
) == ARRAY_TYPE
&& !COMPLETE_TYPE_P (type
))
3741 int failure
= complete_array_type (&TREE_TYPE (decl
),
3742 DECL_INITIAL (decl
), true);
3743 gcc_assert (!failure
);
3745 type
= TREE_TYPE (decl
);
3746 TREE_TYPE (DECL_INITIAL (decl
)) = type
;
3749 if (type
== error_mark_node
|| !COMPLETE_TYPE_P (type
))
3750 return error_mark_node
;
3752 stmt
= build_stmt (DECL_EXPR
, decl
);
3753 complit
= build1 (COMPOUND_LITERAL_EXPR
, type
, stmt
);
3754 TREE_SIDE_EFFECTS (complit
) = 1;
3756 layout_decl (decl
, 0);
3758 if (TREE_STATIC (decl
))
3760 /* This decl needs a name for the assembler output. */
3761 set_compound_literal_name (decl
);
3762 DECL_DEFER_OUTPUT (decl
) = 1;
3763 DECL_COMDAT (decl
) = 1;
3764 DECL_ARTIFICIAL (decl
) = 1;
3765 DECL_IGNORED_P (decl
) = 1;
3767 rest_of_decl_compilation (decl
, 1, 0);
3772 complit
= build2 (C_MAYBE_CONST_EXPR
, type
, NULL
, complit
);
3773 C_MAYBE_CONST_EXPR_NON_CONST (complit
) = 1;
3779 /* Determine whether TYPE is a structure with a flexible array member,
3780 or a union containing such a structure (possibly recursively). */
3783 flexible_array_type_p (tree type
)
3786 switch (TREE_CODE (type
))
3789 x
= TYPE_FIELDS (type
);
3792 while (TREE_CHAIN (x
) != NULL_TREE
)
3794 if (TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
3795 && TYPE_SIZE (TREE_TYPE (x
)) == NULL_TREE
3796 && TYPE_DOMAIN (TREE_TYPE (x
)) != NULL_TREE
3797 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x
))) == NULL_TREE
)
3801 for (x
= TYPE_FIELDS (type
); x
!= NULL_TREE
; x
= TREE_CHAIN (x
))
3803 if (flexible_array_type_p (TREE_TYPE (x
)))
3812 /* Performs sanity checks on the TYPE and WIDTH of the bit-field NAME,
3813 replacing with appropriate values if they are invalid. */
3815 check_bitfield_type_and_width (tree
*type
, tree
*width
, const char *orig_name
)
3818 unsigned int max_width
;
3819 unsigned HOST_WIDE_INT w
;
3820 const char *name
= orig_name
? orig_name
: _("<anonymous>");
3822 /* Detect and ignore out of range field width and process valid
3824 if (!INTEGRAL_TYPE_P (TREE_TYPE (*width
))
3825 || TREE_CODE (*width
) != INTEGER_CST
)
3827 error ("bit-field %qs width not an integer constant", name
);
3828 *width
= integer_one_node
;
3832 constant_expression_warning (*width
);
3833 if (tree_int_cst_sgn (*width
) < 0)
3835 error ("negative width in bit-field %qs", name
);
3836 *width
= integer_one_node
;
3838 else if (integer_zerop (*width
) && orig_name
)
3840 error ("zero width for bit-field %qs", name
);
3841 *width
= integer_one_node
;
3845 /* Detect invalid bit-field type. */
3846 if (TREE_CODE (*type
) != INTEGER_TYPE
3847 && TREE_CODE (*type
) != BOOLEAN_TYPE
3848 && TREE_CODE (*type
) != ENUMERAL_TYPE
)
3850 error ("bit-field %qs has invalid type", name
);
3851 *type
= unsigned_type_node
;
3854 type_mv
= TYPE_MAIN_VARIANT (*type
);
3855 if (!in_system_header
3856 && type_mv
!= integer_type_node
3857 && type_mv
!= unsigned_type_node
3858 && type_mv
!= boolean_type_node
)
3859 pedwarn (input_location
, OPT_pedantic
,
3860 "type of bit-field %qs is a GCC extension", name
);
3862 max_width
= TYPE_PRECISION (*type
);
3864 if (0 < compare_tree_int (*width
, max_width
))
3866 error ("width of %qs exceeds its type", name
);
3868 *width
= build_int_cst (NULL_TREE
, w
);
3871 w
= tree_low_cst (*width
, 1);
3873 if (TREE_CODE (*type
) == ENUMERAL_TYPE
)
3875 struct lang_type
*lt
= TYPE_LANG_SPECIFIC (*type
);
3877 || w
< tree_int_cst_min_precision (lt
->enum_min
, TYPE_UNSIGNED (*type
))
3878 || w
< tree_int_cst_min_precision (lt
->enum_max
, TYPE_UNSIGNED (*type
)))
3879 warning (0, "%qs is narrower than values of its type", name
);
3885 /* Print warning about variable length array if necessary. */
3888 warn_variable_length_array (const char *name
, tree size
)
3890 int const_size
= TREE_CONSTANT (size
);
3892 if (!flag_isoc99
&& pedantic
&& warn_vla
!= 0)
3897 pedwarn (input_location
, OPT_Wvla
, "ISO C90 forbids array %qs whose size "
3898 "can%'t be evaluated",
3901 pedwarn (input_location
, OPT_Wvla
, "ISO C90 forbids array whose size "
3902 "can%'t be evaluated");
3907 pedwarn (input_location
, OPT_Wvla
, "ISO C90 forbids variable length array %qs",
3910 pedwarn (input_location
, OPT_Wvla
, "ISO C90 forbids variable length array");
3913 else if (warn_vla
> 0)
3919 "the size of array %qs can"
3920 "%'t be evaluated", name
);
3923 "the size of array can %'t be evaluated");
3929 "variable length array %qs is used",
3933 "variable length array is used");
3938 /* Given declspecs and a declarator,
3939 determine the name and type of the object declared
3940 and construct a ..._DECL node for it.
3941 (In one case we can return a ..._TYPE node instead.
3942 For invalid input we sometimes return 0.)
3944 DECLSPECS is a c_declspecs structure for the declaration specifiers.
3946 DECL_CONTEXT says which syntactic context this declaration is in:
3947 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3948 FUNCDEF for a function definition. Like NORMAL but a few different
3949 error messages in each case. Return value may be zero meaning
3950 this definition is too screwy to try to parse.
3951 PARM for a parameter declaration (either within a function prototype
3952 or before a function body). Make a PARM_DECL, or return void_type_node.
3953 TYPENAME if for a typename (in a cast or sizeof).
3954 Don't make a DECL node; just return the ..._TYPE node.
3955 FIELD for a struct or union field; make a FIELD_DECL.
3956 INITIALIZED is true if the decl has an initializer.
3957 WIDTH is non-NULL for bit-fields, and is a pointer to an INTEGER_CST node
3958 representing the width of the bit-field.
3959 DECL_ATTRS points to the list of attributes that should be added to this
3960 decl. Any nested attributes that belong on the decl itself will be
3962 If EXPR is not NULL, any expressions that need to be evaluated as
3963 part of evaluating variably modified types will be stored in *EXPR.
3964 If EXPR_CONST_OPERANDS is not NULL, *EXPR_CONST_OPERANDS will be
3965 set to indicate whether operands in *EXPR can be used in constant
3967 DEPRECATED_STATE is a deprecated_states value indicating whether
3968 deprecation warnings should be suppressed.
3970 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3971 It may also be so in the PARM case, for a prototype where the
3972 argument type is specified but not the name.
3974 This function is where the complicated C meanings of `static'
3975 and `extern' are interpreted. */
3978 grokdeclarator (const struct c_declarator
*declarator
,
3979 struct c_declspecs
*declspecs
,
3980 enum decl_context decl_context
, bool initialized
, tree
*width
,
3981 tree
*decl_attrs
, tree
*expr
, bool *expr_const_operands
,
3982 enum deprecated_states deprecated_state
)
3984 tree type
= declspecs
->type
;
3985 bool threadp
= declspecs
->thread_p
;
3986 enum c_storage_class storage_class
= declspecs
->storage_class
;
3990 int type_quals
= TYPE_UNQUALIFIED
;
3991 const char *name
, *orig_name
;
3992 bool funcdef_flag
= false;
3993 bool funcdef_syntax
= false;
3994 int size_varies
= 0;
3995 tree decl_attr
= declspecs
->decl_attr
;
3996 int array_ptr_quals
= TYPE_UNQUALIFIED
;
3997 tree array_ptr_attrs
= NULL_TREE
;
3998 int array_parm_static
= 0;
3999 bool array_parm_vla_unspec_p
= false;
4000 tree returned_attrs
= NULL_TREE
;
4001 bool bitfield
= width
!= NULL
;
4003 struct c_arg_info
*arg_info
= 0;
4005 bool expr_const_operands_dummy
;
4009 if (expr_const_operands
== NULL
)
4010 expr_const_operands
= &expr_const_operands_dummy
;
4012 *expr
= declspecs
->expr
;
4013 *expr_const_operands
= declspecs
->expr_const_operands
;
4015 if (decl_context
== FUNCDEF
)
4016 funcdef_flag
= true, decl_context
= NORMAL
;
4018 /* Look inside a declarator for the name being declared
4019 and get it as a string, for an error message. */
4021 const struct c_declarator
*decl
= declarator
;
4030 funcdef_syntax
= (decl
->kind
== cdk_function
);
4031 decl
= decl
->declarator
;
4035 decl
= decl
->declarator
;
4040 name
= IDENTIFIER_POINTER (decl
->u
.id
);
4052 /* A function definition's declarator must have the form of
4053 a function declarator. */
4055 if (funcdef_flag
&& !funcdef_syntax
)
4058 /* If this looks like a function definition, make it one,
4059 even if it occurs where parms are expected.
4060 Then store_parm_decls will reject it and not use it as a parm. */
4061 if (decl_context
== NORMAL
&& !funcdef_flag
&& current_scope
->parm_flag
)
4062 decl_context
= PARM
;
4064 if (declspecs
->deprecated_p
&& deprecated_state
!= DEPRECATED_SUPPRESS
)
4065 warn_deprecated_use (declspecs
->type
);
4067 if ((decl_context
== NORMAL
|| decl_context
== FIELD
)
4068 && current_scope
== file_scope
4069 && variably_modified_type_p (type
, NULL_TREE
))
4071 error ("variably modified %qs at file scope", name
);
4072 type
= integer_type_node
;
4075 size_varies
= C_TYPE_VARIABLE_SIZE (type
);
4077 /* Diagnose defaulting to "int". */
4079 if (declspecs
->default_int_p
&& !in_system_header
)
4081 /* Issue a warning if this is an ISO C 99 program or if
4082 -Wreturn-type and this is a function, or if -Wimplicit;
4083 prefer the former warning since it is more explicit. */
4084 if ((warn_implicit_int
|| warn_return_type
|| flag_isoc99
)
4086 warn_about_return_type
= 1;
4088 pedwarn_c99 (input_location
, flag_isoc99
? 0 : OPT_Wimplicit_int
,
4089 "type defaults to %<int%> in declaration of %qs", name
);
4092 /* Adjust the type if a bit-field is being declared,
4093 -funsigned-bitfields applied and the type is not explicitly
4095 if (bitfield
&& !flag_signed_bitfields
&& !declspecs
->explicit_signed_p
4096 && TREE_CODE (type
) == INTEGER_TYPE
)
4097 type
= unsigned_type_for (type
);
4099 /* Figure out the type qualifiers for the declaration. There are
4100 two ways a declaration can become qualified. One is something
4101 like `const int i' where the `const' is explicit. Another is
4102 something like `typedef const int CI; CI i' where the type of the
4103 declaration contains the `const'. A third possibility is that
4104 there is a type qualifier on the element type of a typedefed
4105 array type, in which case we should extract that qualifier so
4106 that c_apply_type_quals_to_decl receives the full list of
4107 qualifiers to work with (C90 is not entirely clear about whether
4108 duplicate qualifiers should be diagnosed in this case, but it
4109 seems most appropriate to do so). */
4110 element_type
= strip_array_types (type
);
4111 constp
= declspecs
->const_p
+ TYPE_READONLY (element_type
);
4112 restrictp
= declspecs
->restrict_p
+ TYPE_RESTRICT (element_type
);
4113 volatilep
= declspecs
->volatile_p
+ TYPE_VOLATILE (element_type
);
4114 if (pedantic
&& !flag_isoc99
)
4117 pedwarn (input_location
, OPT_pedantic
, "duplicate %<const%>");
4119 pedwarn (input_location
, OPT_pedantic
, "duplicate %<restrict%>");
4121 pedwarn (input_location
, OPT_pedantic
, "duplicate %<volatile%>");
4123 if (!flag_gen_aux_info
&& (TYPE_QUALS (element_type
)))
4124 type
= TYPE_MAIN_VARIANT (type
);
4125 type_quals
= ((constp
? TYPE_QUAL_CONST
: 0)
4126 | (restrictp
? TYPE_QUAL_RESTRICT
: 0)
4127 | (volatilep
? TYPE_QUAL_VOLATILE
: 0));
4129 /* Warn about storage classes that are invalid for certain
4130 kinds of declarations (parameters, typenames, etc.). */
4134 || storage_class
== csc_auto
4135 || storage_class
== csc_register
4136 || storage_class
== csc_typedef
))
4138 if (storage_class
== csc_auto
)
4139 pedwarn (input_location
,
4140 (current_scope
== file_scope
) ? 0 : OPT_pedantic
,
4141 "function definition declared %<auto%>");
4142 if (storage_class
== csc_register
)
4143 error ("function definition declared %<register%>");
4144 if (storage_class
== csc_typedef
)
4145 error ("function definition declared %<typedef%>");
4147 error ("function definition declared %<__thread%>");
4149 if (storage_class
== csc_auto
4150 || storage_class
== csc_register
4151 || storage_class
== csc_typedef
)
4152 storage_class
= csc_none
;
4154 else if (decl_context
!= NORMAL
&& (storage_class
!= csc_none
|| threadp
))
4156 if (decl_context
== PARM
&& storage_class
== csc_register
)
4160 switch (decl_context
)
4163 error ("storage class specified for structure field %qs",
4167 error ("storage class specified for parameter %qs", name
);
4170 error ("storage class specified for typename");
4173 storage_class
= csc_none
;
4177 else if (storage_class
== csc_extern
4181 /* 'extern' with initialization is invalid if not at file scope. */
4182 if (current_scope
== file_scope
)
4184 /* It is fine to have 'extern const' when compiling at C
4185 and C++ intersection. */
4186 if (!(warn_cxx_compat
&& constp
))
4187 warning (0, "%qs initialized and declared %<extern%>", name
);
4190 error ("%qs has both %<extern%> and initializer", name
);
4192 else if (current_scope
== file_scope
)
4194 if (storage_class
== csc_auto
)
4195 error ("file-scope declaration of %qs specifies %<auto%>", name
);
4196 if (pedantic
&& storage_class
== csc_register
)
4197 pedwarn (input_location
, OPT_pedantic
,
4198 "file-scope declaration of %qs specifies %<register%>", name
);
4202 if (storage_class
== csc_extern
&& funcdef_flag
)
4203 error ("nested function %qs declared %<extern%>", name
);
4204 else if (threadp
&& storage_class
== csc_none
)
4206 error ("function-scope %qs implicitly auto and declared "
4213 /* Now figure out the structure of the declarator proper.
4214 Descend through it, creating more complex types, until we reach
4215 the declared identifier (or NULL_TREE, in an absolute declarator).
4216 At each stage we maintain an unqualified version of the type
4217 together with any qualifiers that should be applied to it with
4218 c_build_qualified_type; this way, array types including
4219 multidimensional array types are first built up in unqualified
4220 form and then the qualified form is created with
4221 TYPE_MAIN_VARIANT pointing to the unqualified form. */
4223 while (declarator
&& declarator
->kind
!= cdk_id
)
4225 if (type
== error_mark_node
)
4227 declarator
= declarator
->declarator
;
4231 /* Each level of DECLARATOR is either a cdk_array (for ...[..]),
4232 a cdk_pointer (for *...),
4233 a cdk_function (for ...(...)),
4234 a cdk_attrs (for nested attributes),
4235 or a cdk_id (for the name being declared
4236 or the place in an absolute declarator
4237 where the name was omitted).
4238 For the last case, we have just exited the loop.
4240 At this point, TYPE is the type of elements of an array,
4241 or for a function to return, or for a pointer to point to.
4242 After this sequence of ifs, TYPE is the type of the
4243 array or function or pointer, and DECLARATOR has had its
4244 outermost layer removed. */
4246 if (array_ptr_quals
!= TYPE_UNQUALIFIED
4247 || array_ptr_attrs
!= NULL_TREE
4248 || array_parm_static
)
4250 /* Only the innermost declarator (making a parameter be of
4251 array type which is converted to pointer type)
4252 may have static or type qualifiers. */
4253 error ("static or type qualifiers in non-parameter array declarator");
4254 array_ptr_quals
= TYPE_UNQUALIFIED
;
4255 array_ptr_attrs
= NULL_TREE
;
4256 array_parm_static
= 0;
4259 switch (declarator
->kind
)
4263 /* A declarator with embedded attributes. */
4264 tree attrs
= declarator
->u
.attrs
;
4265 const struct c_declarator
*inner_decl
;
4267 declarator
= declarator
->declarator
;
4268 inner_decl
= declarator
;
4269 while (inner_decl
->kind
== cdk_attrs
)
4270 inner_decl
= inner_decl
->declarator
;
4271 if (inner_decl
->kind
== cdk_id
)
4272 attr_flags
|= (int) ATTR_FLAG_DECL_NEXT
;
4273 else if (inner_decl
->kind
== cdk_function
)
4274 attr_flags
|= (int) ATTR_FLAG_FUNCTION_NEXT
;
4275 else if (inner_decl
->kind
== cdk_array
)
4276 attr_flags
|= (int) ATTR_FLAG_ARRAY_NEXT
;
4277 returned_attrs
= decl_attributes (&type
,
4278 chainon (returned_attrs
, attrs
),
4284 tree itype
= NULL_TREE
;
4285 tree size
= declarator
->u
.array
.dimen
;
4286 /* The index is a signed object `sizetype' bits wide. */
4287 tree index_type
= c_common_signed_type (sizetype
);
4289 array_ptr_quals
= declarator
->u
.array
.quals
;
4290 array_ptr_attrs
= declarator
->u
.array
.attrs
;
4291 array_parm_static
= declarator
->u
.array
.static_p
;
4292 array_parm_vla_unspec_p
= declarator
->u
.array
.vla_unspec_p
;
4294 declarator
= declarator
->declarator
;
4296 /* Check for some types that there cannot be arrays of. */
4298 if (VOID_TYPE_P (type
))
4300 error ("declaration of %qs as array of voids", name
);
4301 type
= error_mark_node
;
4304 if (TREE_CODE (type
) == FUNCTION_TYPE
)
4306 error ("declaration of %qs as array of functions", name
);
4307 type
= error_mark_node
;
4310 if (pedantic
&& !in_system_header
&& flexible_array_type_p (type
))
4311 pedwarn (input_location
, OPT_pedantic
,
4312 "invalid use of structure with flexible array member");
4314 if (size
== error_mark_node
)
4315 type
= error_mark_node
;
4317 if (type
== error_mark_node
)
4320 /* If size was specified, set ITYPE to a range-type for
4321 that size. Otherwise, ITYPE remains null. finish_decl
4322 may figure it out from an initial value. */
4326 bool size_maybe_const
= true;
4327 bool size_int_const
= (TREE_CODE (size
) == INTEGER_CST
4328 && !TREE_OVERFLOW (size
));
4329 bool this_size_varies
= false;
4331 /* Strip NON_LVALUE_EXPRs since we aren't using as an
4333 STRIP_TYPE_NOPS (size
);
4335 if (!INTEGRAL_TYPE_P (TREE_TYPE (size
)))
4337 error ("size of array %qs has non-integer type", name
);
4338 size
= integer_one_node
;
4341 size
= c_fully_fold (size
, false, &size_maybe_const
);
4343 if (pedantic
&& size_maybe_const
&& integer_zerop (size
))
4344 pedwarn (input_location
, OPT_pedantic
,
4345 "ISO C forbids zero-size array %qs", name
);
4347 if (TREE_CODE (size
) == INTEGER_CST
&& size_maybe_const
)
4349 constant_expression_warning (size
);
4350 if (tree_int_cst_sgn (size
) < 0)
4352 error ("size of array %qs is negative", name
);
4353 size
= integer_one_node
;
4355 /* Handle a size folded to an integer constant but
4356 not an integer constant expression. */
4357 if (!size_int_const
)
4359 /* If this is a file scope declaration of an
4360 ordinary identifier, this is invalid code;
4361 diagnosing it here and not subsequently
4362 treating the type as variable-length avoids
4363 more confusing diagnostics later. */
4364 if ((decl_context
== NORMAL
|| decl_context
== FIELD
)
4365 && current_scope
== file_scope
)
4366 pedwarn (input_location
, 0,
4367 "variably modified %qs at file scope", name
);
4369 this_size_varies
= size_varies
= 1;
4370 warn_variable_length_array (orig_name
, size
);
4373 else if ((decl_context
== NORMAL
|| decl_context
== FIELD
)
4374 && current_scope
== file_scope
)
4376 error ("variably modified %qs at file scope", name
);
4377 size
= integer_one_node
;
4381 /* Make sure the array size remains visibly
4382 nonconstant even if it is (eg) a const variable
4383 with known value. */
4384 this_size_varies
= size_varies
= 1;
4385 warn_variable_length_array (orig_name
, size
);
4388 if (integer_zerop (size
) && !this_size_varies
)
4390 /* A zero-length array cannot be represented with
4391 an unsigned index type, which is what we'll
4392 get with build_index_type. Create an
4393 open-ended range instead. */
4394 itype
= build_range_type (sizetype
, size
, NULL_TREE
);
4398 /* Arrange for the SAVE_EXPR on the inside of the
4399 MINUS_EXPR, which allows the -1 to get folded
4400 with the +1 that happens when building TYPE_SIZE. */
4402 size
= variable_size (size
);
4403 if (this_size_varies
&& TREE_CODE (size
) == INTEGER_CST
)
4404 size
= build2 (COMPOUND_EXPR
, TREE_TYPE (size
),
4405 integer_zero_node
, size
);
4407 /* Compute the maximum valid index, that is, size
4408 - 1. Do the calculation in index_type, so that
4409 if it is a variable the computations will be
4410 done in the proper mode. */
4411 itype
= fold_build2 (MINUS_EXPR
, index_type
,
4412 convert (index_type
, size
),
4413 convert (index_type
,
4416 /* If that overflowed, the array is too big. ???
4417 While a size of INT_MAX+1 technically shouldn't
4418 cause an overflow (because we subtract 1), the
4419 overflow is recorded during the conversion to
4420 index_type, before the subtraction. Handling
4421 this case seems like an unnecessary
4423 if (TREE_CODE (itype
) == INTEGER_CST
4424 && TREE_OVERFLOW (itype
))
4426 error ("size of array %qs is too large", name
);
4427 type
= error_mark_node
;
4431 itype
= build_index_type (itype
);
4433 if (this_size_varies
)
4436 *expr
= build2 (COMPOUND_EXPR
, TREE_TYPE (size
),
4440 *expr_const_operands
&= size_maybe_const
;
4443 else if (decl_context
== FIELD
)
4445 bool flexible_array_member
= false;
4446 if (array_parm_vla_unspec_p
)
4447 /* Field names can in fact have function prototype
4448 scope so [*] is disallowed here through making
4449 the field variably modified, not through being
4450 something other than a declaration with function
4455 const struct c_declarator
*t
= declarator
;
4456 while (t
->kind
== cdk_attrs
)
4458 flexible_array_member
= (t
->kind
== cdk_id
);
4460 if (flexible_array_member
4461 && pedantic
&& !flag_isoc99
&& !in_system_header
)
4462 pedwarn (input_location
, OPT_pedantic
,
4463 "ISO C90 does not support flexible array members");
4465 /* ISO C99 Flexible array members are effectively
4466 identical to GCC's zero-length array extension. */
4467 if (flexible_array_member
|| array_parm_vla_unspec_p
)
4468 itype
= build_range_type (sizetype
, size_zero_node
,
4471 else if (decl_context
== PARM
)
4473 if (array_parm_vla_unspec_p
)
4475 itype
= build_range_type (sizetype
, size_zero_node
, NULL_TREE
);
4479 else if (decl_context
== TYPENAME
)
4481 if (array_parm_vla_unspec_p
)
4484 warning (0, "%<[*]%> not in a declaration");
4485 /* We use this to avoid messing up with incomplete
4486 array types of the same type, that would
4487 otherwise be modified below. */
4488 itype
= build_range_type (sizetype
, size_zero_node
,
4494 /* Complain about arrays of incomplete types. */
4495 if (!COMPLETE_TYPE_P (type
))
4497 error ("array type has incomplete element type");
4498 type
= error_mark_node
;
4501 /* When itype is NULL, a shared incomplete array type is
4502 returned for all array of a given type. Elsewhere we
4503 make sure we don't complete that type before copying
4504 it, but here we want to make sure we don't ever
4505 modify the shared type, so we gcc_assert (itype)
4507 type
= build_array_type (type
, itype
);
4509 if (type
!= error_mark_node
)
4513 /* It is ok to modify type here even if itype is
4514 NULL: if size_varies, we're in a
4515 multi-dimensional array and the inner type has
4516 variable size, so the enclosing shared array type
4518 if (size
&& TREE_CODE (size
) == INTEGER_CST
)
4520 = build_distinct_type_copy (TYPE_MAIN_VARIANT (type
));
4521 C_TYPE_VARIABLE_SIZE (type
) = 1;
4524 /* The GCC extension for zero-length arrays differs from
4525 ISO flexible array members in that sizeof yields
4527 if (size
&& integer_zerop (size
))
4530 TYPE_SIZE (type
) = bitsize_zero_node
;
4531 TYPE_SIZE_UNIT (type
) = size_zero_node
;
4533 if (array_parm_vla_unspec_p
)
4536 /* The type is complete. C99 6.7.5.2p4 */
4537 TYPE_SIZE (type
) = bitsize_zero_node
;
4538 TYPE_SIZE_UNIT (type
) = size_zero_node
;
4542 if (decl_context
!= PARM
4543 && (array_ptr_quals
!= TYPE_UNQUALIFIED
4544 || array_ptr_attrs
!= NULL_TREE
4545 || array_parm_static
))
4547 error ("static or type qualifiers in non-parameter array declarator");
4548 array_ptr_quals
= TYPE_UNQUALIFIED
;
4549 array_ptr_attrs
= NULL_TREE
;
4550 array_parm_static
= 0;
4556 /* Say it's a definition only for the declarator closest
4557 to the identifier, apart possibly from some
4559 bool really_funcdef
= false;
4563 const struct c_declarator
*t
= declarator
->declarator
;
4564 while (t
->kind
== cdk_attrs
)
4566 really_funcdef
= (t
->kind
== cdk_id
);
4569 /* Declaring a function type. Make sure we have a valid
4570 type for the function to return. */
4571 if (type
== error_mark_node
)
4576 /* Warn about some types functions can't return. */
4577 if (TREE_CODE (type
) == FUNCTION_TYPE
)
4579 error ("%qs declared as function returning a function", name
);
4580 type
= integer_type_node
;
4582 if (TREE_CODE (type
) == ARRAY_TYPE
)
4584 error ("%qs declared as function returning an array", name
);
4585 type
= integer_type_node
;
4588 /* Construct the function type and go to the next
4589 inner layer of declarator. */
4590 arg_info
= declarator
->u
.arg_info
;
4591 arg_types
= grokparms (arg_info
, really_funcdef
);
4593 put_pending_sizes (arg_info
->pending_sizes
);
4595 /* Type qualifiers before the return type of the function
4596 qualify the return type, not the function type. */
4599 /* Type qualifiers on a function return type are
4600 normally permitted by the standard but have no
4601 effect, so give a warning at -Wreturn-type.
4602 Qualifiers on a void return type are banned on
4603 function definitions in ISO C; GCC used to used
4604 them for noreturn functions. */
4605 if (VOID_TYPE_P (type
) && really_funcdef
)
4606 pedwarn (input_location
, 0,
4607 "function definition has qualified void return type");
4609 warning (OPT_Wignored_qualifiers
,
4610 "type qualifiers ignored on function return type");
4612 type
= c_build_qualified_type (type
, type_quals
);
4614 type_quals
= TYPE_UNQUALIFIED
;
4616 type
= build_function_type (type
, arg_types
);
4617 declarator
= declarator
->declarator
;
4619 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4620 the formal parameter list of this FUNCTION_TYPE to point to
4621 the FUNCTION_TYPE node itself. */
4625 for (link
= arg_info
->tags
;
4627 link
= TREE_CHAIN (link
))
4628 TYPE_CONTEXT (TREE_VALUE (link
)) = type
;
4634 /* Merge any constancy or volatility into the target type
4637 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
4639 pedwarn (input_location
, OPT_pedantic
,
4640 "ISO C forbids qualified function types");
4642 type
= c_build_qualified_type (type
, type_quals
);
4645 /* When the pointed-to type involves components of variable size,
4646 care must be taken to ensure that the size evaluation code is
4647 emitted early enough to dominate all the possible later uses
4648 and late enough for the variables on which it depends to have
4651 This is expected to happen automatically when the pointed-to
4652 type has a name/declaration of it's own, but special attention
4653 is required if the type is anonymous.
4655 We handle the NORMAL and FIELD contexts here by attaching an
4656 artificial TYPE_DECL to such pointed-to type. This forces the
4657 sizes evaluation at a safe point and ensures it is not deferred
4658 until e.g. within a deeper conditional context.
4660 We expect nothing to be needed here for PARM or TYPENAME.
4661 Pushing a TYPE_DECL at this point for TYPENAME would actually
4662 be incorrect, as we might be in the middle of an expression
4663 with side effects on the pointed-to type size "arguments" prior
4664 to the pointer declaration point and the fake TYPE_DECL in the
4665 enclosing context would force the size evaluation prior to the
4668 if (!TYPE_NAME (type
)
4669 && (decl_context
== NORMAL
|| decl_context
== FIELD
)
4670 && variably_modified_type_p (type
, NULL_TREE
))
4672 tree decl
= build_decl (TYPE_DECL
, NULL_TREE
, type
);
4673 DECL_ARTIFICIAL (decl
) = 1;
4675 finish_decl (decl
, NULL_TREE
, NULL_TREE
);
4676 TYPE_NAME (type
) = decl
;
4679 type
= build_pointer_type (type
);
4681 /* Process type qualifiers (such as const or volatile)
4682 that were given inside the `*'. */
4683 type_quals
= declarator
->u
.pointer_quals
;
4685 declarator
= declarator
->declarator
;
4692 *decl_attrs
= chainon (returned_attrs
, *decl_attrs
);
4694 /* Now TYPE has the actual type, apart from any qualifiers in
4697 /* Check the type and width of a bit-field. */
4699 check_bitfield_type_and_width (&type
, width
, orig_name
);
4701 /* Did array size calculations overflow? */
4703 if (TREE_CODE (type
) == ARRAY_TYPE
4704 && COMPLETE_TYPE_P (type
)
4705 && TREE_CODE (TYPE_SIZE_UNIT (type
)) == INTEGER_CST
4706 && TREE_OVERFLOW (TYPE_SIZE_UNIT (type
)))
4708 error ("size of array %qs is too large", name
);
4709 /* If we proceed with the array type as it is, we'll eventually
4710 crash in tree_low_cst(). */
4711 type
= error_mark_node
;
4714 /* If this is declaring a typedef name, return a TYPE_DECL. */
4716 if (storage_class
== csc_typedef
)
4719 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
4721 pedwarn (input_location
, OPT_pedantic
,
4722 "ISO C forbids qualified function types");
4724 type
= c_build_qualified_type (type
, type_quals
);
4725 decl
= build_decl (TYPE_DECL
, declarator
->u
.id
, type
);
4726 DECL_SOURCE_LOCATION (decl
) = declarator
->id_loc
;
4727 if (declspecs
->explicit_signed_p
)
4728 C_TYPEDEF_EXPLICITLY_SIGNED (decl
) = 1;
4729 if (declspecs
->inline_p
)
4730 pedwarn (input_location
, 0,"typedef %q+D declared %<inline%>", decl
);
4734 /* If this is a type name (such as, in a cast or sizeof),
4735 compute the type and return it now. */
4737 if (decl_context
== TYPENAME
)
4739 /* Note that the grammar rejects storage classes in typenames
4741 gcc_assert (storage_class
== csc_none
&& !threadp
4742 && !declspecs
->inline_p
);
4743 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
4745 pedwarn (input_location
, OPT_pedantic
,
4746 "ISO C forbids const or volatile function types");
4748 type
= c_build_qualified_type (type
, type_quals
);
4752 if (pedantic
&& decl_context
== FIELD
4753 && variably_modified_type_p (type
, NULL_TREE
))
4756 pedwarn (input_location
, OPT_pedantic
,
4757 "a member of a structure or union cannot have a variably modified type");
4760 /* Aside from typedefs and type names (handle above),
4761 `void' at top level (not within pointer)
4762 is allowed only in public variables.
4763 We don't complain about parms either, but that is because
4764 a better error message can be made later. */
4766 if (VOID_TYPE_P (type
) && decl_context
!= PARM
4767 && !((decl_context
!= FIELD
&& TREE_CODE (type
) != FUNCTION_TYPE
)
4768 && (storage_class
== csc_extern
4769 || (current_scope
== file_scope
4770 && !(storage_class
== csc_static
4771 || storage_class
== csc_register
)))))
4773 error ("variable or field %qs declared void", name
);
4774 type
= integer_type_node
;
4777 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4778 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4783 if (decl_context
== PARM
)
4787 /* A parameter declared as an array of T is really a pointer to T.
4788 One declared as a function is really a pointer to a function. */
4790 if (TREE_CODE (type
) == ARRAY_TYPE
)
4792 /* Transfer const-ness of array into that of type pointed to. */
4793 type
= TREE_TYPE (type
);
4795 type
= c_build_qualified_type (type
, type_quals
);
4796 type
= build_pointer_type (type
);
4797 type_quals
= array_ptr_quals
;
4799 type
= c_build_qualified_type (type
, type_quals
);
4801 /* We don't yet implement attributes in this context. */
4802 if (array_ptr_attrs
!= NULL_TREE
)
4803 warning (OPT_Wattributes
,
4804 "attributes in parameter array declarator ignored");
4808 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
4811 pedwarn (input_location
, OPT_pedantic
,
4812 "ISO C forbids qualified function types");
4814 type
= c_build_qualified_type (type
, type_quals
);
4815 type
= build_pointer_type (type
);
4816 type_quals
= TYPE_UNQUALIFIED
;
4818 else if (type_quals
)
4819 type
= c_build_qualified_type (type
, type_quals
);
4821 decl
= build_decl (PARM_DECL
, declarator
->u
.id
, type
);
4822 DECL_SOURCE_LOCATION (decl
) = declarator
->id_loc
;
4824 C_DECL_VARIABLE_SIZE (decl
) = 1;
4826 /* Compute the type actually passed in the parmlist,
4827 for the case where there is no prototype.
4828 (For example, shorts and chars are passed as ints.)
4829 When there is a prototype, this is overridden later. */
4831 if (type
== error_mark_node
)
4832 promoted_type
= type
;
4834 promoted_type
= c_type_promotes_to (type
);
4836 DECL_ARG_TYPE (decl
) = promoted_type
;
4837 if (declspecs
->inline_p
)
4838 pedwarn (input_location
, 0, "parameter %q+D declared %<inline%>", decl
);
4840 else if (decl_context
== FIELD
)
4842 /* Note that the grammar rejects storage classes in typenames
4844 gcc_assert (storage_class
== csc_none
&& !threadp
4845 && !declspecs
->inline_p
);
4847 /* Structure field. It may not be a function. */
4849 if (TREE_CODE (type
) == FUNCTION_TYPE
)
4851 error ("field %qs declared as a function", name
);
4852 type
= build_pointer_type (type
);
4854 else if (TREE_CODE (type
) != ERROR_MARK
4855 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type
))
4857 error ("field %qs has incomplete type", name
);
4858 type
= error_mark_node
;
4860 type
= c_build_qualified_type (type
, type_quals
);
4861 decl
= build_decl (FIELD_DECL
, declarator
->u
.id
, type
);
4862 DECL_SOURCE_LOCATION (decl
) = declarator
->id_loc
;
4863 DECL_NONADDRESSABLE_P (decl
) = bitfield
;
4864 if (bitfield
&& !declarator
->u
.id
)
4865 TREE_NO_WARNING (decl
) = 1;
4868 C_DECL_VARIABLE_SIZE (decl
) = 1;
4870 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
4872 if (storage_class
== csc_register
|| threadp
)
4874 error ("invalid storage class for function %qs", name
);
4876 else if (current_scope
!= file_scope
)
4878 /* Function declaration not at file scope. Storage
4879 classes other than `extern' are not allowed, C99
4880 6.7.1p5, and `extern' makes no difference. However,
4881 GCC allows 'auto', perhaps with 'inline', to support
4882 nested functions. */
4883 if (storage_class
== csc_auto
)
4884 pedwarn (input_location
, OPT_pedantic
, "invalid storage class for function %qs", name
);
4885 else if (storage_class
== csc_static
)
4887 error ("invalid storage class for function %qs", name
);
4889 storage_class
= declspecs
->storage_class
= csc_none
;
4895 decl
= build_decl (FUNCTION_DECL
, declarator
->u
.id
, type
);
4896 DECL_SOURCE_LOCATION (decl
) = declarator
->id_loc
;
4897 decl
= build_decl_attribute_variant (decl
, decl_attr
);
4899 if (pedantic
&& type_quals
&& !DECL_IN_SYSTEM_HEADER (decl
))
4900 pedwarn (input_location
, OPT_pedantic
,
4901 "ISO C forbids qualified function types");
4903 /* GNU C interprets a volatile-qualified function type to indicate
4904 that the function does not return. */
4905 if ((type_quals
& TYPE_QUAL_VOLATILE
)
4906 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl
))))
4907 warning (0, "%<noreturn%> function returns non-void value");
4909 /* Every function declaration is an external reference
4910 (DECL_EXTERNAL) except for those which are not at file
4911 scope and are explicitly declared "auto". This is
4912 forbidden by standard C (C99 6.7.1p5) and is interpreted by
4913 GCC to signify a forward declaration of a nested function. */
4914 if (storage_class
== csc_auto
&& current_scope
!= file_scope
)
4915 DECL_EXTERNAL (decl
) = 0;
4916 /* In C99, a function which is declared 'inline' with 'extern'
4917 is not an external reference (which is confusing). It
4918 means that the later definition of the function must be output
4919 in this file, C99 6.7.4p6. In GNU C89, a function declared
4920 'extern inline' is an external reference. */
4921 else if (declspecs
->inline_p
&& storage_class
!= csc_static
)
4922 DECL_EXTERNAL (decl
) = ((storage_class
== csc_extern
)
4923 == flag_gnu89_inline
);
4925 DECL_EXTERNAL (decl
) = !initialized
;
4927 /* Record absence of global scope for `static' or `auto'. */
4929 = !(storage_class
== csc_static
|| storage_class
== csc_auto
);
4931 /* For a function definition, record the argument information
4932 block where store_parm_decls will look for it. */
4934 current_function_arg_info
= arg_info
;
4936 if (declspecs
->default_int_p
)
4937 C_FUNCTION_IMPLICIT_INT (decl
) = 1;
4939 /* Record presence of `inline', if it is reasonable. */
4940 if (flag_hosted
&& MAIN_NAME_P (declarator
->u
.id
))
4942 if (declspecs
->inline_p
)
4943 pedwarn (input_location
, 0, "cannot inline function %<main%>");
4945 else if (declspecs
->inline_p
)
4946 /* Record that the function is declared `inline'. */
4947 DECL_DECLARED_INLINE_P (decl
) = 1;
4951 /* It's a variable. */
4952 /* An uninitialized decl with `extern' is a reference. */
4953 int extern_ref
= !initialized
&& storage_class
== csc_extern
;
4955 type
= c_build_qualified_type (type
, type_quals
);
4957 /* C99 6.2.2p7: It is invalid (compile-time undefined
4958 behavior) to create an 'extern' declaration for a
4959 variable if there is a global declaration that is
4960 'static' and the global declaration is not visible.
4961 (If the static declaration _is_ currently visible,
4962 the 'extern' declaration is taken to refer to that decl.) */
4963 if (extern_ref
&& current_scope
!= file_scope
)
4965 tree global_decl
= identifier_global_value (declarator
->u
.id
);
4966 tree visible_decl
= lookup_name (declarator
->u
.id
);
4969 && global_decl
!= visible_decl
4970 && TREE_CODE (global_decl
) == VAR_DECL
4971 && !TREE_PUBLIC (global_decl
))
4972 error ("variable previously declared %<static%> redeclared "
4976 decl
= build_decl (VAR_DECL
, declarator
->u
.id
, type
);
4977 DECL_SOURCE_LOCATION (decl
) = declarator
->id_loc
;
4979 C_DECL_VARIABLE_SIZE (decl
) = 1;
4981 if (declspecs
->inline_p
)
4982 pedwarn (input_location
, 0, "variable %q+D declared %<inline%>", decl
);
4984 /* At file scope, an initialized extern declaration may follow
4985 a static declaration. In that case, DECL_EXTERNAL will be
4986 reset later in start_decl. */
4987 DECL_EXTERNAL (decl
) = (storage_class
== csc_extern
);
4989 /* At file scope, the presence of a `static' or `register' storage
4990 class specifier, or the absence of all storage class specifiers
4991 makes this declaration a definition (perhaps tentative). Also,
4992 the absence of `static' makes it public. */
4993 if (current_scope
== file_scope
)
4995 TREE_PUBLIC (decl
) = storage_class
!= csc_static
;
4996 TREE_STATIC (decl
) = !extern_ref
;
4998 /* Not at file scope, only `static' makes a static definition. */
5001 TREE_STATIC (decl
) = (storage_class
== csc_static
);
5002 TREE_PUBLIC (decl
) = extern_ref
;
5006 DECL_TLS_MODEL (decl
) = decl_default_tls_model (decl
);
5009 if (storage_class
== csc_extern
5010 && variably_modified_type_p (type
, NULL_TREE
))
5013 error ("object with variably modified type must have no linkage");
5016 /* Record `register' declaration for warnings on &
5017 and in case doing stupid register allocation. */
5019 if (storage_class
== csc_register
)
5021 C_DECL_REGISTER (decl
) = 1;
5022 DECL_REGISTER (decl
) = 1;
5025 /* Record constancy and volatility. */
5026 c_apply_type_quals_to_decl (type_quals
, decl
);
5028 /* If a type has volatile components, it should be stored in memory.
5029 Otherwise, the fact that those components are volatile
5030 will be ignored, and would even crash the compiler.
5031 Of course, this only makes sense on VAR,PARM, and RESULT decl's. */
5032 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl
))
5033 && (TREE_CODE (decl
) == VAR_DECL
|| TREE_CODE (decl
) == PARM_DECL
5034 || TREE_CODE (decl
) == RESULT_DECL
))
5036 /* It is not an error for a structure with volatile fields to
5037 be declared register, but reset DECL_REGISTER since it
5038 cannot actually go in a register. */
5039 int was_reg
= C_DECL_REGISTER (decl
);
5040 C_DECL_REGISTER (decl
) = 0;
5041 DECL_REGISTER (decl
) = 0;
5042 c_mark_addressable (decl
);
5043 C_DECL_REGISTER (decl
) = was_reg
;
5046 /* This is the earliest point at which we might know the assembler
5047 name of a variable. Thus, if it's known before this, die horribly. */
5048 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl
));
5054 /* Decode the parameter-list info for a function type or function definition.
5055 The argument is the value returned by `get_parm_info' (or made in c-parse.c
5056 if there is an identifier list instead of a parameter decl list).
5057 These two functions are separate because when a function returns
5058 or receives functions then each is called multiple times but the order
5059 of calls is different. The last call to `grokparms' is always the one
5060 that contains the formal parameter names of a function definition.
5062 Return a list of arg types to use in the FUNCTION_TYPE for this function.
5064 FUNCDEF_FLAG is true for a function definition, false for
5065 a mere declaration. A nonempty identifier-list gets an error message
5066 when FUNCDEF_FLAG is false. */
5069 grokparms (struct c_arg_info
*arg_info
, bool funcdef_flag
)
5071 tree arg_types
= arg_info
->types
;
5073 if (funcdef_flag
&& arg_info
->had_vla_unspec
)
5075 /* A function definition isn't function prototype scope C99 6.2.1p4. */
5077 error ("%<[*]%> not allowed in other than function prototype scope");
5080 if (arg_types
== 0 && !funcdef_flag
&& !in_system_header
)
5081 warning (OPT_Wstrict_prototypes
,
5082 "function declaration isn%'t a prototype");
5084 if (arg_types
== error_mark_node
)
5085 return 0; /* don't set TYPE_ARG_TYPES in this case */
5087 else if (arg_types
&& TREE_CODE (TREE_VALUE (arg_types
)) == IDENTIFIER_NODE
)
5090 pedwarn (input_location
, 0, "parameter names (without types) in function declaration");
5092 arg_info
->parms
= arg_info
->types
;
5093 arg_info
->types
= 0;
5098 tree parm
, type
, typelt
;
5099 unsigned int parmno
;
5101 /* If there is a parameter of incomplete type in a definition,
5102 this is an error. In a declaration this is valid, and a
5103 struct or union type may be completed later, before any calls
5104 or definition of the function. In the case where the tag was
5105 first declared within the parameter list, a warning has
5106 already been given. If a parameter has void type, then
5107 however the function cannot be defined or called, so
5110 for (parm
= arg_info
->parms
, typelt
= arg_types
, parmno
= 1;
5112 parm
= TREE_CHAIN (parm
), typelt
= TREE_CHAIN (typelt
), parmno
++)
5114 type
= TREE_VALUE (typelt
);
5115 if (type
== error_mark_node
)
5118 if (!COMPLETE_TYPE_P (type
))
5122 if (DECL_NAME (parm
))
5123 error ("parameter %u (%q+D) has incomplete type",
5126 error ("%Jparameter %u has incomplete type",
5129 TREE_VALUE (typelt
) = error_mark_node
;
5130 TREE_TYPE (parm
) = error_mark_node
;
5132 else if (VOID_TYPE_P (type
))
5134 if (DECL_NAME (parm
))
5135 warning (0, "parameter %u (%q+D) has void type",
5138 warning (0, "%Jparameter %u has void type",
5143 if (DECL_NAME (parm
) && TREE_USED (parm
))
5144 warn_if_shadowing (parm
);
5150 /* Take apart the current scope and return a c_arg_info structure with
5151 info on a parameter list just parsed.
5153 This structure is later fed to 'grokparms' and 'store_parm_decls'.
5155 ELLIPSIS being true means the argument list ended in '...' so don't
5156 append a sentinel (void_list_node) to the end of the type-list. */
5159 get_parm_info (bool ellipsis
)
5161 struct c_binding
*b
= current_scope
->bindings
;
5162 struct c_arg_info
*arg_info
= XOBNEW (&parser_obstack
,
5169 static bool explained_incomplete_types
= false;
5170 bool gave_void_only_once_err
= false;
5172 arg_info
->parms
= 0;
5174 arg_info
->types
= 0;
5175 arg_info
->others
= 0;
5176 arg_info
->pending_sizes
= 0;
5177 arg_info
->had_vla_unspec
= current_scope
->had_vla_unspec
;
5179 /* The bindings in this scope must not get put into a block.
5180 We will take care of deleting the binding nodes. */
5181 current_scope
->bindings
= 0;
5183 /* This function is only called if there was *something* on the
5187 /* A parameter list consisting solely of 'void' indicates that the
5188 function takes no arguments. But if the 'void' is qualified
5189 (by 'const' or 'volatile'), or has a storage class specifier
5190 ('register'), then the behavior is undefined; issue an error.
5191 Typedefs for 'void' are OK (see DR#157). */
5192 if (b
->prev
== 0 /* one binding */
5193 && TREE_CODE (b
->decl
) == PARM_DECL
/* which is a parameter */
5194 && !DECL_NAME (b
->decl
) /* anonymous */
5195 && VOID_TYPE_P (TREE_TYPE (b
->decl
))) /* of void type */
5197 if (TREE_THIS_VOLATILE (b
->decl
)
5198 || TREE_READONLY (b
->decl
)
5199 || C_DECL_REGISTER (b
->decl
))
5200 error ("%<void%> as only parameter may not be qualified");
5202 /* There cannot be an ellipsis. */
5204 error ("%<void%> must be the only parameter");
5206 arg_info
->types
= void_list_node
;
5211 types
= void_list_node
;
5213 /* Break up the bindings list into parms, tags, types, and others;
5214 apply sanity checks; purge the name-to-decl bindings. */
5217 tree decl
= b
->decl
;
5218 tree type
= TREE_TYPE (decl
);
5219 const char *keyword
;
5221 switch (TREE_CODE (decl
))
5226 gcc_assert (I_SYMBOL_BINDING (b
->id
) == b
);
5227 I_SYMBOL_BINDING (b
->id
) = b
->shadowed
;
5230 /* Check for forward decls that never got their actual decl. */
5231 if (TREE_ASM_WRITTEN (decl
))
5232 error ("parameter %q+D has just a forward declaration", decl
);
5233 /* Check for (..., void, ...) and issue an error. */
5234 else if (VOID_TYPE_P (type
) && !DECL_NAME (decl
))
5236 if (!gave_void_only_once_err
)
5238 error ("%<void%> must be the only parameter");
5239 gave_void_only_once_err
= true;
5244 /* Valid parameter, add it to the list. */
5245 TREE_CHAIN (decl
) = parms
;
5248 /* Since there is a prototype, args are passed in their
5249 declared types. The back end may override this later. */
5250 DECL_ARG_TYPE (decl
) = type
;
5251 types
= tree_cons (0, type
, types
);
5255 case ENUMERAL_TYPE
: keyword
= "enum"; goto tag
;
5256 case UNION_TYPE
: keyword
= "union"; goto tag
;
5257 case RECORD_TYPE
: keyword
= "struct"; goto tag
;
5259 /* Types may not have tag-names, in which case the type
5260 appears in the bindings list with b->id NULL. */
5263 gcc_assert (I_TAG_BINDING (b
->id
) == b
);
5264 I_TAG_BINDING (b
->id
) = b
->shadowed
;
5267 /* Warn about any struct, union or enum tags defined in a
5268 parameter list. The scope of such types is limited to
5269 the parameter list, which is rarely if ever desirable
5270 (it's impossible to call such a function with type-
5271 correct arguments). An anonymous union parm type is
5272 meaningful as a GNU extension, so don't warn for that. */
5273 if (TREE_CODE (decl
) != UNION_TYPE
|| b
->id
!= 0)
5276 /* The %s will be one of 'struct', 'union', or 'enum'. */
5277 warning (0, "%<%s %E%> declared inside parameter list",
5280 /* The %s will be one of 'struct', 'union', or 'enum'. */
5281 warning (0, "anonymous %s declared inside parameter list",
5284 if (!explained_incomplete_types
)
5286 warning (0, "its scope is only this definition or declaration,"
5287 " which is probably not what you want");
5288 explained_incomplete_types
= true;
5292 tags
= tree_cons (b
->id
, decl
, tags
);
5298 /* CONST_DECLs appear here when we have an embedded enum,
5299 and TYPE_DECLs appear here when we have an embedded struct
5300 or union. No warnings for this - we already warned about the
5301 type itself. FUNCTION_DECLs appear when there is an implicit
5302 function declaration in the parameter list. */
5304 TREE_CHAIN (decl
) = others
;
5309 /* error_mark_node appears here when we have an undeclared
5310 variable. Just throw it away. */
5313 gcc_assert (I_SYMBOL_BINDING (b
->id
) == b
);
5314 I_SYMBOL_BINDING (b
->id
) = b
->shadowed
;
5318 /* Other things that might be encountered. */
5325 b
= free_binding_and_advance (b
);
5328 arg_info
->parms
= parms
;
5329 arg_info
->tags
= tags
;
5330 arg_info
->types
= types
;
5331 arg_info
->others
= others
;
5332 arg_info
->pending_sizes
= get_pending_sizes ();
5336 /* Get the struct, enum or union (CODE says which) with tag NAME.
5337 Define the tag as a forward-reference if it is not defined.
5338 Return a c_typespec structure for the type specifier. */
5341 parser_xref_tag (enum tree_code code
, tree name
)
5343 struct c_typespec ret
;
5346 ret
.expr
= NULL_TREE
;
5347 ret
.expr_const_operands
= true;
5349 /* If a cross reference is requested, look up the type
5350 already defined for this tag and return it. */
5352 ref
= lookup_tag (code
, name
, 0);
5353 /* If this is the right type of tag, return what we found.
5354 (This reference will be shadowed by shadow_tag later if appropriate.)
5355 If this is the wrong type of tag, do not return it. If it was the
5356 wrong type in the same scope, we will have had an error
5357 message already; if in a different scope and declaring
5358 a name, pending_xref_error will give an error message; but if in a
5359 different scope and not declaring a name, this tag should
5360 shadow the previous declaration of a different type of tag, and
5361 this would not work properly if we return the reference found.
5362 (For example, with "struct foo" in an outer scope, "union foo;"
5363 must shadow that tag with a new one of union type.) */
5364 ret
.kind
= (ref
? ctsk_tagref
: ctsk_tagfirstref
);
5365 if (ref
&& TREE_CODE (ref
) == code
)
5371 /* If no such tag is yet defined, create a forward-reference node
5372 and record it as the "definition".
5373 When a real declaration of this type is found,
5374 the forward-reference will be altered into a real type. */
5376 ref
= make_node (code
);
5377 if (code
== ENUMERAL_TYPE
)
5379 /* Give the type a default layout like unsigned int
5380 to avoid crashing if it does not get defined. */
5381 SET_TYPE_MODE (ref
, TYPE_MODE (unsigned_type_node
));
5382 TYPE_ALIGN (ref
) = TYPE_ALIGN (unsigned_type_node
);
5383 TYPE_USER_ALIGN (ref
) = 0;
5384 TYPE_UNSIGNED (ref
) = 1;
5385 TYPE_PRECISION (ref
) = TYPE_PRECISION (unsigned_type_node
);
5386 TYPE_MIN_VALUE (ref
) = TYPE_MIN_VALUE (unsigned_type_node
);
5387 TYPE_MAX_VALUE (ref
) = TYPE_MAX_VALUE (unsigned_type_node
);
5390 pushtag (name
, ref
);
5396 /* Get the struct, enum or union (CODE says which) with tag NAME.
5397 Define the tag as a forward-reference if it is not defined.
5398 Return a tree for the type. */
5401 xref_tag (enum tree_code code
, tree name
)
5403 return parser_xref_tag (code
, name
).spec
;
5406 /* Make sure that the tag NAME is defined *in the current scope*
5407 at least as a forward reference.
5408 CODE says which kind of tag NAME ought to be. */
5411 start_struct (enum tree_code code
, tree name
)
5413 /* If there is already a tag defined at this scope
5414 (as a forward reference), just return it. */
5419 ref
= lookup_tag (code
, name
, 1);
5420 if (ref
&& TREE_CODE (ref
) == code
)
5422 if (TYPE_SIZE (ref
))
5424 if (code
== UNION_TYPE
)
5425 error ("redefinition of %<union %E%>", name
);
5427 error ("redefinition of %<struct %E%>", name
);
5428 /* Don't create structures using a name already in use. */
5431 else if (C_TYPE_BEING_DEFINED (ref
))
5433 if (code
== UNION_TYPE
)
5434 error ("nested redefinition of %<union %E%>", name
);
5436 error ("nested redefinition of %<struct %E%>", name
);
5437 /* Don't create structures that contain themselves. */
5442 /* Otherwise create a forward-reference just so the tag is in scope. */
5444 if (ref
== NULL_TREE
|| TREE_CODE (ref
) != code
)
5446 ref
= make_node (code
);
5447 pushtag (name
, ref
);
5450 C_TYPE_BEING_DEFINED (ref
) = 1;
5451 TYPE_PACKED (ref
) = flag_pack_struct
;
5455 /* Process the specs, declarator and width (NULL if omitted)
5456 of a structure component, returning a FIELD_DECL node.
5457 WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node.
5458 DECL_ATTRS is as for grokdeclarator.
5460 LOC is the location of the structure component.
5462 This is done during the parsing of the struct declaration.
5463 The FIELD_DECL nodes are chained together and the lot of them
5464 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5467 grokfield (location_t loc
,
5468 struct c_declarator
*declarator
, struct c_declspecs
*declspecs
,
5469 tree width
, tree
*decl_attrs
)
5473 if (declarator
->kind
== cdk_id
&& declarator
->u
.id
== NULL_TREE
5474 && width
== NULL_TREE
)
5476 /* This is an unnamed decl.
5478 If we have something of the form "union { list } ;" then this
5479 is the anonymous union extension. Similarly for struct.
5481 If this is something of the form "struct foo;", then
5482 If MS extensions are enabled, this is handled as an
5484 Otherwise this is a forward declaration of a structure tag.
5486 If this is something of the form "foo;" and foo is a TYPE_DECL, then
5487 If MS extensions are enabled and foo names a structure, then
5488 again this is an anonymous struct.
5489 Otherwise this is an error.
5491 Oh what a horrid tangled web we weave. I wonder if MS consciously
5492 took this from Plan 9 or if it was an accident of implementation
5493 that took root before someone noticed the bug... */
5495 tree type
= declspecs
->type
;
5496 bool type_ok
= (TREE_CODE (type
) == RECORD_TYPE
5497 || TREE_CODE (type
) == UNION_TYPE
);
5501 && (flag_ms_extensions
|| !declspecs
->typedef_p
))
5503 if (flag_ms_extensions
)
5507 else if (TYPE_NAME (type
) == NULL
)
5514 pedwarn (loc
, 0, "declaration does not declare anything");
5517 pedwarn (loc
, OPT_pedantic
, "ISO C doesn%'t support unnamed structs/unions");
5520 value
= grokdeclarator (declarator
, declspecs
, FIELD
, false,
5521 width
? &width
: NULL
, decl_attrs
, NULL
, NULL
,
5524 finish_decl (value
, NULL_TREE
, NULL_TREE
);
5525 DECL_INITIAL (value
) = width
;
5530 /* Generate an error for any duplicate field names in FIELDLIST. Munge
5531 the list such that this does not present a problem later. */
5534 detect_field_duplicates (tree fieldlist
)
5539 /* First, see if there are more than "a few" fields.
5540 This is trivially true if there are zero or one fields. */
5543 x
= TREE_CHAIN (fieldlist
);
5549 } while (timeout
> 0 && x
);
5551 /* If there were "few" fields, avoid the overhead of allocating
5552 a hash table. Instead just do the nested traversal thing. */
5555 for (x
= TREE_CHAIN (fieldlist
); x
; x
= TREE_CHAIN (x
))
5558 for (y
= fieldlist
; y
!= x
; y
= TREE_CHAIN (y
))
5559 if (DECL_NAME (y
) == DECL_NAME (x
))
5561 error ("duplicate member %q+D", x
);
5562 DECL_NAME (x
) = NULL_TREE
;
5568 htab_t htab
= htab_create (37, htab_hash_pointer
, htab_eq_pointer
, NULL
);
5571 for (x
= fieldlist
; x
; x
= TREE_CHAIN (x
))
5572 if ((y
= DECL_NAME (x
)) != 0)
5574 slot
= htab_find_slot (htab
, y
, INSERT
);
5577 error ("duplicate member %q+D", x
);
5578 DECL_NAME (x
) = NULL_TREE
;
5587 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5588 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5589 ATTRIBUTES are attributes to be applied to the structure. */
5592 finish_struct (tree t
, tree fieldlist
, tree attributes
)
5595 bool toplevel
= file_scope
== current_scope
;
5596 int saw_named_field
;
5598 /* If this type was previously laid out as a forward reference,
5599 make sure we lay it out again. */
5603 decl_attributes (&t
, attributes
, (int) ATTR_FLAG_TYPE_IN_PLACE
);
5607 for (x
= fieldlist
; x
; x
= TREE_CHAIN (x
))
5608 if (DECL_NAME (x
) != 0)
5613 if (TREE_CODE (t
) == UNION_TYPE
)
5616 pedwarn (input_location
, OPT_pedantic
, "union has no named members");
5618 pedwarn (input_location
, OPT_pedantic
, "union has no members");
5623 pedwarn (input_location
, OPT_pedantic
, "struct has no named members");
5625 pedwarn (input_location
, OPT_pedantic
, "struct has no members");
5630 /* Install struct as DECL_CONTEXT of each field decl.
5631 Also process specified field sizes, found in the DECL_INITIAL,
5632 storing 0 there after the type has been changed to precision equal
5633 to its width, rather than the precision of the specified standard
5634 type. (Correct layout requires the original type to have been preserved
5637 saw_named_field
= 0;
5638 for (x
= fieldlist
; x
; x
= TREE_CHAIN (x
))
5640 if (TREE_TYPE (x
) == error_mark_node
)
5643 DECL_CONTEXT (x
) = t
;
5645 /* If any field is const, the structure type is pseudo-const. */
5646 if (TREE_READONLY (x
))
5647 C_TYPE_FIELDS_READONLY (t
) = 1;
5650 /* A field that is pseudo-const makes the structure likewise. */
5651 tree t1
= TREE_TYPE (x
);
5652 while (TREE_CODE (t1
) == ARRAY_TYPE
)
5653 t1
= TREE_TYPE (t1
);
5654 if ((TREE_CODE (t1
) == RECORD_TYPE
|| TREE_CODE (t1
) == UNION_TYPE
)
5655 && C_TYPE_FIELDS_READONLY (t1
))
5656 C_TYPE_FIELDS_READONLY (t
) = 1;
5659 /* Any field that is volatile means variables of this type must be
5660 treated in some ways as volatile. */
5661 if (TREE_THIS_VOLATILE (x
))
5662 C_TYPE_FIELDS_VOLATILE (t
) = 1;
5664 /* Any field of nominal variable size implies structure is too. */
5665 if (C_DECL_VARIABLE_SIZE (x
))
5666 C_TYPE_VARIABLE_SIZE (t
) = 1;
5668 if (DECL_INITIAL (x
))
5670 unsigned HOST_WIDE_INT width
= tree_low_cst (DECL_INITIAL (x
), 1);
5671 DECL_SIZE (x
) = bitsize_int (width
);
5672 DECL_BIT_FIELD (x
) = 1;
5673 SET_DECL_C_BIT_FIELD (x
);
5677 && (DECL_BIT_FIELD (x
)
5678 || TYPE_ALIGN (TREE_TYPE (x
)) > BITS_PER_UNIT
))
5679 DECL_PACKED (x
) = 1;
5681 /* Detect flexible array member in an invalid context. */
5682 if (TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
5683 && TYPE_SIZE (TREE_TYPE (x
)) == NULL_TREE
5684 && TYPE_DOMAIN (TREE_TYPE (x
)) != NULL_TREE
5685 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x
))) == NULL_TREE
)
5687 if (TREE_CODE (t
) == UNION_TYPE
)
5689 error ("%Jflexible array member in union", x
);
5690 TREE_TYPE (x
) = error_mark_node
;
5692 else if (TREE_CHAIN (x
) != NULL_TREE
)
5694 error ("%Jflexible array member not at end of struct", x
);
5695 TREE_TYPE (x
) = error_mark_node
;
5697 else if (!saw_named_field
)
5699 error ("%Jflexible array member in otherwise empty struct", x
);
5700 TREE_TYPE (x
) = error_mark_node
;
5704 if (pedantic
&& !in_system_header
&& TREE_CODE (t
) == RECORD_TYPE
5705 && flexible_array_type_p (TREE_TYPE (x
)))
5706 pedwarn (input_location
, OPT_pedantic
,
5707 "%Jinvalid use of structure with flexible array member", x
);
5710 saw_named_field
= 1;
5713 detect_field_duplicates (fieldlist
);
5715 /* Now we have the nearly final fieldlist. Record it,
5716 then lay out the structure or union (including the fields). */
5718 TYPE_FIELDS (t
) = fieldlist
;
5722 /* Give bit-fields their proper types. */
5724 tree
*fieldlistp
= &fieldlist
;
5726 if (TREE_CODE (*fieldlistp
) == FIELD_DECL
&& DECL_INITIAL (*fieldlistp
)
5727 && TREE_TYPE (*fieldlistp
) != error_mark_node
)
5729 unsigned HOST_WIDE_INT width
5730 = tree_low_cst (DECL_INITIAL (*fieldlistp
), 1);
5731 tree type
= TREE_TYPE (*fieldlistp
);
5732 if (width
!= TYPE_PRECISION (type
))
5734 TREE_TYPE (*fieldlistp
)
5735 = c_build_bitfield_integer_type (width
, TYPE_UNSIGNED (type
));
5736 DECL_MODE (*fieldlistp
) = TYPE_MODE (TREE_TYPE (*fieldlistp
));
5738 DECL_INITIAL (*fieldlistp
) = 0;
5741 fieldlistp
= &TREE_CHAIN (*fieldlistp
);
5744 /* Now we have the truly final field list.
5745 Store it in this type and in the variants. */
5747 TYPE_FIELDS (t
) = fieldlist
;
5749 /* If there are lots of fields, sort so we can look through them fast.
5750 We arbitrarily consider 16 or more elts to be "a lot". */
5755 for (x
= fieldlist
; x
; x
= TREE_CHAIN (x
))
5757 if (len
> 15 || DECL_NAME (x
) == NULL
)
5765 struct lang_type
*space
;
5766 struct sorted_fields_type
*space2
;
5768 len
+= list_length (x
);
5770 /* Use the same allocation policy here that make_node uses, to
5771 ensure that this lives as long as the rest of the struct decl.
5772 All decls in an inline function need to be saved. */
5774 space
= GGC_CNEW (struct lang_type
);
5775 space2
= GGC_NEWVAR (struct sorted_fields_type
,
5776 sizeof (struct sorted_fields_type
) + len
* sizeof (tree
));
5780 field_array
= &space2
->elts
[0];
5781 for (x
= fieldlist
; x
; x
= TREE_CHAIN (x
))
5783 field_array
[len
++] = x
;
5785 /* If there is anonymous struct or union, break out of the loop. */
5786 if (DECL_NAME (x
) == NULL
)
5789 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
5792 TYPE_LANG_SPECIFIC (t
) = space
;
5793 TYPE_LANG_SPECIFIC (t
)->s
->len
= len
;
5794 field_array
= TYPE_LANG_SPECIFIC (t
)->s
->elts
;
5795 qsort (field_array
, len
, sizeof (tree
), field_decl_cmp
);
5800 for (x
= TYPE_MAIN_VARIANT (t
); x
; x
= TYPE_NEXT_VARIANT (x
))
5802 TYPE_FIELDS (x
) = TYPE_FIELDS (t
);
5803 TYPE_LANG_SPECIFIC (x
) = TYPE_LANG_SPECIFIC (t
);
5804 C_TYPE_FIELDS_READONLY (x
) = C_TYPE_FIELDS_READONLY (t
);
5805 C_TYPE_FIELDS_VOLATILE (x
) = C_TYPE_FIELDS_VOLATILE (t
);
5806 C_TYPE_VARIABLE_SIZE (x
) = C_TYPE_VARIABLE_SIZE (t
);
5809 /* If this was supposed to be a transparent union, but we can't
5810 make it one, warn and turn off the flag. */
5811 if (TREE_CODE (t
) == UNION_TYPE
5812 && TYPE_TRANSPARENT_UNION (t
)
5813 && (!TYPE_FIELDS (t
) || TYPE_MODE (t
) != DECL_MODE (TYPE_FIELDS (t
))))
5815 TYPE_TRANSPARENT_UNION (t
) = 0;
5816 warning (0, "union cannot be made transparent");
5819 /* If this structure or union completes the type of any previous
5820 variable declaration, lay it out and output its rtl. */
5821 for (x
= C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t
));
5825 tree decl
= TREE_VALUE (x
);
5826 if (TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
)
5827 layout_array_type (TREE_TYPE (decl
));
5828 if (TREE_CODE (decl
) != TYPE_DECL
)
5830 layout_decl (decl
, 0);
5831 if (c_dialect_objc ())
5832 objc_check_decl (decl
);
5833 rest_of_decl_compilation (decl
, toplevel
, 0);
5838 C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t
)) = 0;
5840 /* Finish debugging output for this type. */
5841 rest_of_type_compilation (t
, toplevel
);
5843 /* If we're inside a function proper, i.e. not file-scope and not still
5844 parsing parameters, then arrange for the size of a variable sized type
5846 if (cur_stmt_list
&& variably_modified_type_p (t
, NULL_TREE
))
5847 add_stmt (build_stmt (DECL_EXPR
, build_decl (TYPE_DECL
, NULL
, t
)));
5852 /* Lay out the type T, and its element type, and so on. */
5855 layout_array_type (tree t
)
5857 if (TREE_CODE (TREE_TYPE (t
)) == ARRAY_TYPE
)
5858 layout_array_type (TREE_TYPE (t
));
5862 /* Begin compiling the definition of an enumeration type.
5863 NAME is its name (or null if anonymous).
5864 Returns the type object, as yet incomplete.
5865 Also records info about it so that build_enumerator
5866 may be used to declare the individual values as they are read. */
5869 start_enum (struct c_enum_contents
*the_enum
, tree name
)
5873 /* If this is the real definition for a previous forward reference,
5874 fill in the contents in the same object that used to be the
5875 forward reference. */
5878 enumtype
= lookup_tag (ENUMERAL_TYPE
, name
, 1);
5880 if (enumtype
== 0 || TREE_CODE (enumtype
) != ENUMERAL_TYPE
)
5882 enumtype
= make_node (ENUMERAL_TYPE
);
5883 pushtag (name
, enumtype
);
5886 if (C_TYPE_BEING_DEFINED (enumtype
))
5887 error ("nested redefinition of %<enum %E%>", name
);
5889 C_TYPE_BEING_DEFINED (enumtype
) = 1;
5891 if (TYPE_VALUES (enumtype
) != 0)
5893 /* This enum is a named one that has been declared already. */
5894 error ("redeclaration of %<enum %E%>", name
);
5896 /* Completely replace its old definition.
5897 The old enumerators remain defined, however. */
5898 TYPE_VALUES (enumtype
) = 0;
5901 the_enum
->enum_next_value
= integer_zero_node
;
5902 the_enum
->enum_overflow
= 0;
5904 if (flag_short_enums
)
5905 TYPE_PACKED (enumtype
) = 1;
5910 /* After processing and defining all the values of an enumeration type,
5911 install their decls in the enumeration type and finish it off.
5912 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5913 and ATTRIBUTES are the specified attributes.
5914 Returns ENUMTYPE. */
5917 finish_enum (tree enumtype
, tree values
, tree attributes
)
5920 tree minnode
= 0, maxnode
= 0;
5921 int precision
, unsign
;
5922 bool toplevel
= (file_scope
== current_scope
);
5923 struct lang_type
*lt
;
5925 decl_attributes (&enumtype
, attributes
, (int) ATTR_FLAG_TYPE_IN_PLACE
);
5927 /* Calculate the maximum value of any enumerator in this type. */
5929 if (values
== error_mark_node
)
5930 minnode
= maxnode
= integer_zero_node
;
5933 minnode
= maxnode
= TREE_VALUE (values
);
5934 for (pair
= TREE_CHAIN (values
); pair
; pair
= TREE_CHAIN (pair
))
5936 tree value
= TREE_VALUE (pair
);
5937 if (tree_int_cst_lt (maxnode
, value
))
5939 if (tree_int_cst_lt (value
, minnode
))
5944 /* Construct the final type of this enumeration. It is the same
5945 as one of the integral types - the narrowest one that fits, except
5946 that normally we only go as narrow as int - and signed iff any of
5947 the values are negative. */
5948 unsign
= (tree_int_cst_sgn (minnode
) >= 0);
5949 precision
= MAX (tree_int_cst_min_precision (minnode
, unsign
),
5950 tree_int_cst_min_precision (maxnode
, unsign
));
5952 if (TYPE_PACKED (enumtype
) || precision
> TYPE_PRECISION (integer_type_node
))
5954 tem
= c_common_type_for_size (precision
, unsign
);
5957 warning (0, "enumeration values exceed range of largest integer");
5958 tem
= long_long_integer_type_node
;
5962 tem
= unsign
? unsigned_type_node
: integer_type_node
;
5964 TYPE_MIN_VALUE (enumtype
) = TYPE_MIN_VALUE (tem
);
5965 TYPE_MAX_VALUE (enumtype
) = TYPE_MAX_VALUE (tem
);
5966 TYPE_UNSIGNED (enumtype
) = TYPE_UNSIGNED (tem
);
5967 TYPE_SIZE (enumtype
) = 0;
5969 /* If the precision of the type was specific with an attribute and it
5970 was too small, give an error. Otherwise, use it. */
5971 if (TYPE_PRECISION (enumtype
))
5973 if (precision
> TYPE_PRECISION (enumtype
))
5974 error ("specified mode too small for enumeral values");
5977 TYPE_PRECISION (enumtype
) = TYPE_PRECISION (tem
);
5979 layout_type (enumtype
);
5981 if (values
!= error_mark_node
)
5983 /* Change the type of the enumerators to be the enum type. We
5984 need to do this irrespective of the size of the enum, for
5985 proper type checking. Replace the DECL_INITIALs of the
5986 enumerators, and the value slots of the list, with copies
5987 that have the enum type; they cannot be modified in place
5988 because they may be shared (e.g. integer_zero_node) Finally,
5989 change the purpose slots to point to the names of the decls. */
5990 for (pair
= values
; pair
; pair
= TREE_CHAIN (pair
))
5992 tree enu
= TREE_PURPOSE (pair
);
5993 tree ini
= DECL_INITIAL (enu
);
5995 TREE_TYPE (enu
) = enumtype
;
5997 /* The ISO C Standard mandates enumerators to have type int,
5998 even though the underlying type of an enum type is
5999 unspecified. However, GCC allows enumerators of any
6000 integer type as an extensions. build_enumerator()
6001 converts any enumerators that fit in an int to type int,
6002 to avoid promotions to unsigned types when comparing
6003 integers with enumerators that fit in the int range.
6004 When -pedantic is given, build_enumerator() would have
6005 already warned about those that don't fit. Here we
6006 convert the rest to the enumerator type. */
6007 if (TREE_TYPE (ini
) != integer_type_node
)
6008 ini
= convert (enumtype
, ini
);
6010 DECL_INITIAL (enu
) = ini
;
6011 TREE_PURPOSE (pair
) = DECL_NAME (enu
);
6012 TREE_VALUE (pair
) = ini
;
6015 TYPE_VALUES (enumtype
) = values
;
6018 /* Record the min/max values so that we can warn about bit-field
6019 enumerations that are too small for the values. */
6020 lt
= GGC_CNEW (struct lang_type
);
6021 lt
->enum_min
= minnode
;
6022 lt
->enum_max
= maxnode
;
6023 TYPE_LANG_SPECIFIC (enumtype
) = lt
;
6025 /* Fix up all variant types of this enum type. */
6026 for (tem
= TYPE_MAIN_VARIANT (enumtype
); tem
; tem
= TYPE_NEXT_VARIANT (tem
))
6028 if (tem
== enumtype
)
6030 TYPE_VALUES (tem
) = TYPE_VALUES (enumtype
);
6031 TYPE_MIN_VALUE (tem
) = TYPE_MIN_VALUE (enumtype
);
6032 TYPE_MAX_VALUE (tem
) = TYPE_MAX_VALUE (enumtype
);
6033 TYPE_SIZE (tem
) = TYPE_SIZE (enumtype
);
6034 TYPE_SIZE_UNIT (tem
) = TYPE_SIZE_UNIT (enumtype
);
6035 SET_TYPE_MODE (tem
, TYPE_MODE (enumtype
));
6036 TYPE_PRECISION (tem
) = TYPE_PRECISION (enumtype
);
6037 TYPE_ALIGN (tem
) = TYPE_ALIGN (enumtype
);
6038 TYPE_USER_ALIGN (tem
) = TYPE_USER_ALIGN (enumtype
);
6039 TYPE_UNSIGNED (tem
) = TYPE_UNSIGNED (enumtype
);
6040 TYPE_LANG_SPECIFIC (tem
) = TYPE_LANG_SPECIFIC (enumtype
);
6043 /* Finish debugging output for this type. */
6044 rest_of_type_compilation (enumtype
, toplevel
);
6049 /* Build and install a CONST_DECL for one value of the
6050 current enumeration type (one that was begun with start_enum).
6051 Return a tree-list containing the CONST_DECL and its value.
6052 Assignment of sequential values by default is handled here. */
6055 build_enumerator (struct c_enum_contents
*the_enum
, tree name
, tree value
,
6056 location_t value_loc
)
6060 /* Validate and default VALUE. */
6064 /* Don't issue more errors for error_mark_node (i.e. an
6065 undeclared identifier) - just ignore the value expression. */
6066 if (value
== error_mark_node
)
6068 else if (!INTEGRAL_TYPE_P (TREE_TYPE (value
))
6069 || TREE_CODE (value
) != INTEGER_CST
)
6071 error ("enumerator value for %qE is not an integer constant", name
);
6076 value
= default_conversion (value
);
6077 constant_expression_warning (value
);
6081 /* Default based on previous value. */
6082 /* It should no longer be possible to have NON_LVALUE_EXPR
6086 value
= the_enum
->enum_next_value
;
6087 if (the_enum
->enum_overflow
)
6088 error ("overflow in enumeration values");
6090 /* Even though the underlying type of an enum is unspecified, the
6091 type of enumeration constants is explicitly defined as int
6092 (6.4.4.3/2 in the C99 Standard). GCC allows any integer type as
6094 else if (!int_fits_type_p (value
, integer_type_node
))
6095 pedwarn (value_loc
, OPT_pedantic
,
6096 "ISO C restricts enumerator values to range of %<int%>");
6098 /* The ISO C Standard mandates enumerators to have type int, even
6099 though the underlying type of an enum type is unspecified.
6100 However, GCC allows enumerators of any integer type as an
6101 extensions. Here we convert any enumerators that fit in an int
6102 to type int, to avoid promotions to unsigned types when comparing
6103 integers with enumerators that fit in the int range. When
6104 -pedantic is given, we would have already warned about those that
6105 don't fit. We have to do this here rather than in finish_enum
6106 because this value may be used to define more enumerators. */
6107 if (int_fits_type_p (value
, integer_type_node
))
6108 value
= convert (integer_type_node
, value
);
6110 /* Set basis for default for next value. */
6111 the_enum
->enum_next_value
6113 (EXPR_HAS_LOCATION (value
) ? EXPR_LOCATION (value
) : input_location
,
6114 PLUS_EXPR
, value
, integer_one_node
, 0);
6115 the_enum
->enum_overflow
= tree_int_cst_lt (the_enum
->enum_next_value
, value
);
6117 /* Now create a declaration for the enum value name. */
6119 type
= TREE_TYPE (value
);
6120 type
= c_common_type_for_size (MAX (TYPE_PRECISION (type
),
6121 TYPE_PRECISION (integer_type_node
)),
6122 (TYPE_PRECISION (type
)
6123 >= TYPE_PRECISION (integer_type_node
)
6124 && TYPE_UNSIGNED (type
)));
6126 decl
= build_decl (CONST_DECL
, name
, type
);
6127 DECL_INITIAL (decl
) = convert (type
, value
);
6130 return tree_cons (decl
, value
, NULL_TREE
);
6134 /* Create the FUNCTION_DECL for a function definition.
6135 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
6136 the declaration; they describe the function's name and the type it returns,
6137 but twisted together in a fashion that parallels the syntax of C.
6139 This function creates a binding context for the function body
6140 as well as setting up the FUNCTION_DECL in current_function_decl.
6142 Returns 1 on success. If the DECLARATOR is not suitable for a function
6143 (it defines a datum instead), we return 0, which tells
6144 yyparse to report a parse error. */
6147 start_function (struct c_declspecs
*declspecs
, struct c_declarator
*declarator
,
6150 tree decl1
, old_decl
;
6151 tree restype
, resdecl
;
6152 struct c_label_context_se
*nstack_se
;
6153 struct c_label_context_vm
*nstack_vm
;
6155 current_function_returns_value
= 0; /* Assume, until we see it does. */
6156 current_function_returns_null
= 0;
6157 current_function_returns_abnormally
= 0;
6158 warn_about_return_type
= 0;
6159 c_switch_stack
= NULL
;
6161 nstack_se
= XOBNEW (&parser_obstack
, struct c_label_context_se
);
6162 nstack_se
->labels_def
= NULL
;
6163 nstack_se
->labels_used
= NULL
;
6164 nstack_se
->next
= label_context_stack_se
;
6165 label_context_stack_se
= nstack_se
;
6167 nstack_vm
= XOBNEW (&parser_obstack
, struct c_label_context_vm
);
6168 nstack_vm
->labels_def
= NULL
;
6169 nstack_vm
->labels_used
= NULL
;
6170 nstack_vm
->scope
= 0;
6171 nstack_vm
->next
= label_context_stack_vm
;
6172 label_context_stack_vm
= nstack_vm
;
6174 /* Indicate no valid break/continue context by setting these variables
6175 to some non-null, non-label value. We'll notice and emit the proper
6176 error message in c_finish_bc_stmt. */
6177 c_break_label
= c_cont_label
= size_zero_node
;
6179 decl1
= grokdeclarator (declarator
, declspecs
, FUNCDEF
, true, NULL
,
6180 &attributes
, NULL
, NULL
, DEPRECATED_NORMAL
);
6182 /* If the declarator is not suitable for a function definition,
6183 cause a syntax error. */
6186 label_context_stack_se
= label_context_stack_se
->next
;
6187 label_context_stack_vm
= label_context_stack_vm
->next
;
6191 decl_attributes (&decl1
, attributes
, 0);
6193 if (DECL_DECLARED_INLINE_P (decl1
)
6194 && DECL_UNINLINABLE (decl1
)
6195 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1
)))
6196 warning (OPT_Wattributes
, "inline function %q+D given attribute noinline",
6199 /* Handle gnu_inline attribute. */
6200 if (declspecs
->inline_p
6201 && !flag_gnu89_inline
6202 && TREE_CODE (decl1
) == FUNCTION_DECL
6203 && (lookup_attribute ("gnu_inline", DECL_ATTRIBUTES (decl1
))
6204 || current_function_decl
))
6206 if (declspecs
->storage_class
!= csc_static
)
6207 DECL_EXTERNAL (decl1
) = !DECL_EXTERNAL (decl1
);
6210 announce_function (decl1
);
6212 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1
))))
6214 error ("return type is an incomplete type");
6215 /* Make it return void instead. */
6217 = build_function_type (void_type_node
,
6218 TYPE_ARG_TYPES (TREE_TYPE (decl1
)));
6221 if (warn_about_return_type
)
6222 pedwarn_c99 (input_location
, flag_isoc99
? 0
6223 : (warn_return_type
? OPT_Wreturn_type
: OPT_Wimplicit_int
),
6224 "return type defaults to %<int%>");
6226 /* Make the init_value nonzero so pushdecl knows this is not tentative.
6227 error_mark_node is replaced below (in pop_scope) with the BLOCK. */
6228 DECL_INITIAL (decl1
) = error_mark_node
;
6230 /* If this definition isn't a prototype and we had a prototype declaration
6231 before, copy the arg type info from that prototype. */
6232 old_decl
= lookup_name_in_scope (DECL_NAME (decl1
), current_scope
);
6233 if (old_decl
&& TREE_CODE (old_decl
) != FUNCTION_DECL
)
6235 current_function_prototype_locus
= UNKNOWN_LOCATION
;
6236 current_function_prototype_built_in
= false;
6237 current_function_prototype_arg_types
= NULL_TREE
;
6238 if (TYPE_ARG_TYPES (TREE_TYPE (decl1
)) == 0)
6240 if (old_decl
!= 0 && TREE_CODE (TREE_TYPE (old_decl
)) == FUNCTION_TYPE
6241 && comptypes (TREE_TYPE (TREE_TYPE (decl1
)),
6242 TREE_TYPE (TREE_TYPE (old_decl
))))
6244 TREE_TYPE (decl1
) = composite_type (TREE_TYPE (old_decl
),
6246 current_function_prototype_locus
= DECL_SOURCE_LOCATION (old_decl
);
6247 current_function_prototype_built_in
6248 = C_DECL_BUILTIN_PROTOTYPE (old_decl
);
6249 current_function_prototype_arg_types
6250 = TYPE_ARG_TYPES (TREE_TYPE (decl1
));
6252 if (TREE_PUBLIC (decl1
))
6254 /* If there is an external prototype declaration of this
6255 function, record its location but do not copy information
6256 to this decl. This may be an invisible declaration
6257 (built-in or in a scope which has finished) or simply
6258 have more refined argument types than any declaration
6260 struct c_binding
*b
;
6261 for (b
= I_SYMBOL_BINDING (DECL_NAME (decl1
)); b
; b
= b
->shadowed
)
6262 if (B_IN_SCOPE (b
, external_scope
))
6266 tree ext_decl
, ext_type
;
6268 ext_type
= b
->type
? b
->type
: TREE_TYPE (ext_decl
);
6269 if (TREE_CODE (ext_type
) == FUNCTION_TYPE
6270 && comptypes (TREE_TYPE (TREE_TYPE (decl1
)),
6271 TREE_TYPE (ext_type
)))
6273 current_function_prototype_locus
6274 = DECL_SOURCE_LOCATION (ext_decl
);
6275 current_function_prototype_built_in
6276 = C_DECL_BUILTIN_PROTOTYPE (ext_decl
);
6277 current_function_prototype_arg_types
6278 = TYPE_ARG_TYPES (ext_type
);
6284 /* Optionally warn of old-fashioned def with no previous prototype. */
6285 if (warn_strict_prototypes
6286 && old_decl
!= error_mark_node
6287 && TYPE_ARG_TYPES (TREE_TYPE (decl1
)) == 0
6288 && C_DECL_ISNT_PROTOTYPE (old_decl
))
6289 warning (OPT_Wstrict_prototypes
,
6290 "function declaration isn%'t a prototype");
6291 /* Optionally warn of any global def with no previous prototype. */
6292 else if (warn_missing_prototypes
6293 && old_decl
!= error_mark_node
6294 && TREE_PUBLIC (decl1
)
6295 && !MAIN_NAME_P (DECL_NAME (decl1
))
6296 && C_DECL_ISNT_PROTOTYPE (old_decl
))
6297 warning (OPT_Wmissing_prototypes
, "no previous prototype for %q+D", decl1
);
6298 /* Optionally warn of any def with no previous prototype
6299 if the function has already been used. */
6300 else if (warn_missing_prototypes
6302 && old_decl
!= error_mark_node
6303 && TREE_USED (old_decl
)
6304 && TYPE_ARG_TYPES (TREE_TYPE (old_decl
)) == 0)
6305 warning (OPT_Wmissing_prototypes
,
6306 "%q+D was used with no prototype before its definition", decl1
);
6307 /* Optionally warn of any global def with no previous declaration. */
6308 else if (warn_missing_declarations
6309 && TREE_PUBLIC (decl1
)
6311 && !MAIN_NAME_P (DECL_NAME (decl1
)))
6312 warning (OPT_Wmissing_declarations
, "no previous declaration for %q+D",
6314 /* Optionally warn of any def with no previous declaration
6315 if the function has already been used. */
6316 else if (warn_missing_declarations
6318 && old_decl
!= error_mark_node
6319 && TREE_USED (old_decl
)
6320 && C_DECL_IMPLICIT (old_decl
))
6321 warning (OPT_Wmissing_declarations
,
6322 "%q+D was used with no declaration before its definition", decl1
);
6324 /* This function exists in static storage.
6325 (This does not mean `static' in the C sense!) */
6326 TREE_STATIC (decl1
) = 1;
6328 /* A nested function is not global. */
6329 if (current_function_decl
!= 0)
6330 TREE_PUBLIC (decl1
) = 0;
6332 /* This is the earliest point at which we might know the assembler
6333 name of the function. Thus, if it's set before this, die horribly. */
6334 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl1
));
6336 /* If #pragma weak was used, mark the decl weak now. */
6337 if (current_scope
== file_scope
)
6338 maybe_apply_pragma_weak (decl1
);
6340 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
6341 if (warn_main
&& MAIN_NAME_P (DECL_NAME (decl1
)))
6343 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1
)))
6344 != integer_type_node
)
6345 pedwarn (input_location
, OPT_Wmain
, "return type of %q+D is not %<int%>", decl1
);
6347 check_main_parameter_types (decl1
);
6349 if (!TREE_PUBLIC (decl1
))
6350 pedwarn (input_location
, OPT_Wmain
, "%q+D is normally a non-static function", decl1
);
6353 /* Record the decl so that the function name is defined.
6354 If we already have a decl for this name, and it is a FUNCTION_DECL,
6355 use the old decl. */
6357 current_function_decl
= pushdecl (decl1
);
6360 declare_parm_level ();
6362 restype
= TREE_TYPE (TREE_TYPE (current_function_decl
));
6363 resdecl
= build_decl (RESULT_DECL
, NULL_TREE
, restype
);
6364 DECL_ARTIFICIAL (resdecl
) = 1;
6365 DECL_IGNORED_P (resdecl
) = 1;
6366 DECL_RESULT (current_function_decl
) = resdecl
;
6368 start_fname_decls ();
6373 /* Subroutine of store_parm_decls which handles new-style function
6374 definitions (prototype format). The parms already have decls, so we
6375 need only record them as in effect and complain if any redundant
6376 old-style parm decls were written. */
6378 store_parm_decls_newstyle (tree fndecl
, const struct c_arg_info
*arg_info
)
6382 if (current_scope
->bindings
)
6384 error ("%Jold-style parameter declarations in prototyped "
6385 "function definition", fndecl
);
6387 /* Get rid of the old-style declarations. */
6391 /* Don't issue this warning for nested functions, and don't issue this
6392 warning if we got here because ARG_INFO_TYPES was error_mark_node
6393 (this happens when a function definition has just an ellipsis in
6394 its parameter list). */
6395 else if (!in_system_header
&& !current_function_scope
6396 && arg_info
->types
!= error_mark_node
)
6397 warning (OPT_Wtraditional
,
6398 "%Jtraditional C rejects ISO C style function definitions",
6401 /* Now make all the parameter declarations visible in the function body.
6402 We can bypass most of the grunt work of pushdecl. */
6403 for (decl
= arg_info
->parms
; decl
; decl
= TREE_CHAIN (decl
))
6405 DECL_CONTEXT (decl
) = current_function_decl
;
6406 if (DECL_NAME (decl
))
6408 bind (DECL_NAME (decl
), decl
, current_scope
,
6409 /*invisible=*/false, /*nested=*/false,
6411 if (!TREE_USED (decl
))
6412 warn_if_shadowing (decl
);
6415 error ("%Jparameter name omitted", decl
);
6418 /* Record the parameter list in the function declaration. */
6419 DECL_ARGUMENTS (fndecl
) = arg_info
->parms
;
6421 /* Now make all the ancillary declarations visible, likewise. */
6422 for (decl
= arg_info
->others
; decl
; decl
= TREE_CHAIN (decl
))
6424 DECL_CONTEXT (decl
) = current_function_decl
;
6425 if (DECL_NAME (decl
))
6426 bind (DECL_NAME (decl
), decl
, current_scope
,
6427 /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION
);
6430 /* And all the tag declarations. */
6431 for (decl
= arg_info
->tags
; decl
; decl
= TREE_CHAIN (decl
))
6432 if (TREE_PURPOSE (decl
))
6433 bind (TREE_PURPOSE (decl
), TREE_VALUE (decl
), current_scope
,
6434 /*invisible=*/false, /*nested=*/false, UNKNOWN_LOCATION
);
6437 /* Subroutine of store_parm_decls which handles old-style function
6438 definitions (separate parameter list and declarations). */
6441 store_parm_decls_oldstyle (tree fndecl
, const struct c_arg_info
*arg_info
)
6443 struct c_binding
*b
;
6444 tree parm
, decl
, last
;
6445 tree parmids
= arg_info
->parms
;
6446 struct pointer_set_t
*seen_args
= pointer_set_create ();
6448 if (!in_system_header
)
6449 warning (OPT_Wold_style_definition
, "%Jold-style function definition",
6452 /* Match each formal parameter name with its declaration. Save each
6453 decl in the appropriate TREE_PURPOSE slot of the parmids chain. */
6454 for (parm
= parmids
; parm
; parm
= TREE_CHAIN (parm
))
6456 if (TREE_VALUE (parm
) == 0)
6458 error ("%Jparameter name missing from parameter list", fndecl
);
6459 TREE_PURPOSE (parm
) = 0;
6463 b
= I_SYMBOL_BINDING (TREE_VALUE (parm
));
6464 if (b
&& B_IN_CURRENT_SCOPE (b
))
6467 /* If we got something other than a PARM_DECL it is an error. */
6468 if (TREE_CODE (decl
) != PARM_DECL
)
6469 error ("%q+D declared as a non-parameter", decl
);
6470 /* If the declaration is already marked, we have a duplicate
6471 name. Complain and ignore the duplicate. */
6472 else if (pointer_set_contains (seen_args
, decl
))
6474 error ("multiple parameters named %q+D", decl
);
6475 TREE_PURPOSE (parm
) = 0;
6478 /* If the declaration says "void", complain and turn it into
6480 else if (VOID_TYPE_P (TREE_TYPE (decl
)))
6482 error ("parameter %q+D declared with void type", decl
);
6483 TREE_TYPE (decl
) = integer_type_node
;
6484 DECL_ARG_TYPE (decl
) = integer_type_node
;
6485 layout_decl (decl
, 0);
6487 warn_if_shadowing (decl
);
6489 /* If no declaration found, default to int. */
6492 decl
= build_decl (PARM_DECL
, TREE_VALUE (parm
), integer_type_node
);
6493 DECL_ARG_TYPE (decl
) = TREE_TYPE (decl
);
6494 DECL_SOURCE_LOCATION (decl
) = DECL_SOURCE_LOCATION (fndecl
);
6496 warn_if_shadowing (decl
);
6499 pedwarn (input_location
, 0, "type of %q+D defaults to %<int%>", decl
);
6501 warning (OPT_Wmissing_parameter_type
, "type of %q+D defaults to %<int%>", decl
);
6504 TREE_PURPOSE (parm
) = decl
;
6505 pointer_set_insert (seen_args
, decl
);
6508 /* Now examine the parms chain for incomplete declarations
6509 and declarations with no corresponding names. */
6511 for (b
= current_scope
->bindings
; b
; b
= b
->prev
)
6514 if (TREE_CODE (parm
) != PARM_DECL
)
6517 if (TREE_TYPE (parm
) != error_mark_node
6518 && !COMPLETE_TYPE_P (TREE_TYPE (parm
)))
6520 error ("parameter %q+D has incomplete type", parm
);
6521 TREE_TYPE (parm
) = error_mark_node
;
6524 if (!pointer_set_contains (seen_args
, parm
))
6526 error ("declaration for parameter %q+D but no such parameter", parm
);
6528 /* Pretend the parameter was not missing.
6529 This gets us to a standard state and minimizes
6530 further error messages. */
6531 parmids
= chainon (parmids
, tree_cons (parm
, 0, 0));
6535 /* Chain the declarations together in the order of the list of
6536 names. Store that chain in the function decl, replacing the
6537 list of names. Update the current scope to match. */
6538 DECL_ARGUMENTS (fndecl
) = 0;
6540 for (parm
= parmids
; parm
; parm
= TREE_CHAIN (parm
))
6541 if (TREE_PURPOSE (parm
))
6543 if (parm
&& TREE_PURPOSE (parm
))
6545 last
= TREE_PURPOSE (parm
);
6546 DECL_ARGUMENTS (fndecl
) = last
;
6548 for (parm
= TREE_CHAIN (parm
); parm
; parm
= TREE_CHAIN (parm
))
6549 if (TREE_PURPOSE (parm
))
6551 TREE_CHAIN (last
) = TREE_PURPOSE (parm
);
6552 last
= TREE_PURPOSE (parm
);
6554 TREE_CHAIN (last
) = 0;
6557 pointer_set_destroy (seen_args
);
6559 /* If there was a previous prototype,
6560 set the DECL_ARG_TYPE of each argument according to
6561 the type previously specified, and report any mismatches. */
6563 if (current_function_prototype_arg_types
)
6566 for (parm
= DECL_ARGUMENTS (fndecl
),
6567 type
= current_function_prototype_arg_types
;
6568 parm
|| (type
&& TREE_VALUE (type
) != error_mark_node
6569 && (TYPE_MAIN_VARIANT (TREE_VALUE (type
)) != void_type_node
));
6570 parm
= TREE_CHAIN (parm
), type
= TREE_CHAIN (type
))
6572 if (parm
== 0 || type
== 0
6573 || TYPE_MAIN_VARIANT (TREE_VALUE (type
)) == void_type_node
)
6575 if (current_function_prototype_built_in
)
6576 warning (0, "number of arguments doesn%'t match "
6577 "built-in prototype");
6580 error ("number of arguments doesn%'t match prototype");
6581 error ("%Hprototype declaration",
6582 ¤t_function_prototype_locus
);
6586 /* Type for passing arg must be consistent with that
6587 declared for the arg. ISO C says we take the unqualified
6588 type for parameters declared with qualified type. */
6589 if (TREE_TYPE (parm
) != error_mark_node
6590 && TREE_TYPE (type
) != error_mark_node
6591 && !comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm
)),
6592 TYPE_MAIN_VARIANT (TREE_VALUE (type
))))
6594 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm
))
6595 == TYPE_MAIN_VARIANT (TREE_VALUE (type
)))
6597 /* Adjust argument to match prototype. E.g. a previous
6598 `int foo(float);' prototype causes
6599 `int foo(x) float x; {...}' to be treated like
6600 `int foo(float x) {...}'. This is particularly
6601 useful for argument types like uid_t. */
6602 DECL_ARG_TYPE (parm
) = TREE_TYPE (parm
);
6604 if (targetm
.calls
.promote_prototypes (TREE_TYPE (current_function_decl
))
6605 && INTEGRAL_TYPE_P (TREE_TYPE (parm
))
6606 && TYPE_PRECISION (TREE_TYPE (parm
))
6607 < TYPE_PRECISION (integer_type_node
))
6608 DECL_ARG_TYPE (parm
) = integer_type_node
;
6610 /* ??? Is it possible to get here with a
6611 built-in prototype or will it always have
6612 been diagnosed as conflicting with an
6613 old-style definition and discarded? */
6614 if (current_function_prototype_built_in
)
6615 warning (OPT_pedantic
, "promoted argument %qD "
6616 "doesn%'t match built-in prototype", parm
);
6619 pedwarn (input_location
, OPT_pedantic
, "promoted argument %qD "
6620 "doesn%'t match prototype", parm
);
6621 pedwarn (current_function_prototype_locus
, OPT_pedantic
,
6622 "prototype declaration");
6627 if (current_function_prototype_built_in
)
6628 warning (0, "argument %qD doesn%'t match "
6629 "built-in prototype", parm
);
6632 error ("argument %qD doesn%'t match prototype", parm
);
6633 error ("%Hprototype declaration",
6634 ¤t_function_prototype_locus
);
6639 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl
)) = 0;
6642 /* Otherwise, create a prototype that would match. */
6646 tree actual
= 0, last
= 0, type
;
6648 for (parm
= DECL_ARGUMENTS (fndecl
); parm
; parm
= TREE_CHAIN (parm
))
6650 type
= tree_cons (NULL_TREE
, DECL_ARG_TYPE (parm
), NULL_TREE
);
6652 TREE_CHAIN (last
) = type
;
6657 type
= tree_cons (NULL_TREE
, void_type_node
, NULL_TREE
);
6659 TREE_CHAIN (last
) = type
;
6663 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6664 of the type of this function, but we need to avoid having this
6665 affect the types of other similarly-typed functions, so we must
6666 first force the generation of an identical (but separate) type
6667 node for the relevant function type. The new node we create
6668 will be a variant of the main variant of the original function
6671 TREE_TYPE (fndecl
) = build_variant_type_copy (TREE_TYPE (fndecl
));
6673 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl
)) = actual
;
6677 /* Store parameter declarations passed in ARG_INFO into the current
6678 function declaration. */
6681 store_parm_decls_from (struct c_arg_info
*arg_info
)
6683 current_function_arg_info
= arg_info
;
6684 store_parm_decls ();
6687 /* Store the parameter declarations into the current function declaration.
6688 This is called after parsing the parameter declarations, before
6689 digesting the body of the function.
6691 For an old-style definition, construct a prototype out of the old-style
6692 parameter declarations and inject it into the function's type. */
6695 store_parm_decls (void)
6697 tree fndecl
= current_function_decl
;
6700 /* The argument information block for FNDECL. */
6701 struct c_arg_info
*arg_info
= current_function_arg_info
;
6702 current_function_arg_info
= 0;
6704 /* True if this definition is written with a prototype. Note:
6705 despite C99 6.7.5.3p14, we can *not* treat an empty argument
6706 list in a function definition as equivalent to (void) -- an
6707 empty argument list specifies the function has no parameters,
6708 but only (void) sets up a prototype for future calls. */
6709 proto
= arg_info
->types
!= 0;
6712 store_parm_decls_newstyle (fndecl
, arg_info
);
6714 store_parm_decls_oldstyle (fndecl
, arg_info
);
6716 /* The next call to push_scope will be a function body. */
6718 next_is_function_body
= true;
6720 /* Write a record describing this function definition to the prototypes
6721 file (if requested). */
6723 gen_aux_info_record (fndecl
, 1, 0, proto
);
6725 /* Initialize the RTL code for the function. */
6726 allocate_struct_function (fndecl
, false);
6728 /* Begin the statement tree for this function. */
6729 DECL_SAVED_TREE (fndecl
) = push_stmt_list ();
6731 /* ??? Insert the contents of the pending sizes list into the function
6732 to be evaluated. The only reason left to have this is
6733 void foo(int n, int array[n++])
6734 because we throw away the array type in favor of a pointer type, and
6735 thus won't naturally see the SAVE_EXPR containing the increment. All
6736 other pending sizes would be handled by gimplify_parameters. */
6739 for (t
= nreverse (get_pending_sizes ()); t
; t
= TREE_CHAIN (t
))
6740 add_stmt (TREE_VALUE (t
));
6743 /* Even though we're inside a function body, we still don't want to
6744 call expand_expr to calculate the size of a variable-sized array.
6745 We haven't necessarily assigned RTL to all variables yet, so it's
6746 not safe to try to expand expressions involving them. */
6747 cfun
->dont_save_pending_sizes_p
= 1;
6750 /* Emit diagnostics that require gimple input for detection. Operate on
6751 FNDECL and all its nested functions. */
6754 c_gimple_diagnostics_recursively (tree fndecl
)
6756 struct cgraph_node
*cgn
;
6757 gimple_seq body
= gimple_body (fndecl
);
6759 /* Handle attribute((warn_unused_result)). Relies on gimple input. */
6760 c_warn_unused_result (body
);
6762 /* Notice when OpenMP structured block constraints are violated. */
6764 diagnose_omp_structured_block_errors (fndecl
);
6766 /* Finalize all nested functions now. */
6767 cgn
= cgraph_node (fndecl
);
6768 for (cgn
= cgn
->nested
; cgn
; cgn
= cgn
->next_nested
)
6769 c_gimple_diagnostics_recursively (cgn
->decl
);
6772 /* Finish up a function declaration and compile that function
6773 all the way to assembler language output. The free the storage
6774 for the function definition.
6776 This is called after parsing the body of the function definition. */
6779 finish_function (void)
6781 tree fndecl
= current_function_decl
;
6783 label_context_stack_se
= label_context_stack_se
->next
;
6784 label_context_stack_vm
= label_context_stack_vm
->next
;
6786 if (TREE_CODE (fndecl
) == FUNCTION_DECL
6787 && targetm
.calls
.promote_prototypes (TREE_TYPE (fndecl
)))
6789 tree args
= DECL_ARGUMENTS (fndecl
);
6790 for (; args
; args
= TREE_CHAIN (args
))
6792 tree type
= TREE_TYPE (args
);
6793 if (INTEGRAL_TYPE_P (type
)
6794 && TYPE_PRECISION (type
) < TYPE_PRECISION (integer_type_node
))
6795 DECL_ARG_TYPE (args
) = integer_type_node
;
6799 if (DECL_INITIAL (fndecl
) && DECL_INITIAL (fndecl
) != error_mark_node
)
6800 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl
)) = fndecl
;
6802 /* Must mark the RESULT_DECL as being in this function. */
6804 if (DECL_RESULT (fndecl
) && DECL_RESULT (fndecl
) != error_mark_node
)
6805 DECL_CONTEXT (DECL_RESULT (fndecl
)) = fndecl
;
6807 if (MAIN_NAME_P (DECL_NAME (fndecl
)) && flag_hosted
6808 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl
)))
6809 == integer_type_node
&& flag_isoc99
)
6811 tree stmt
= c_finish_return (integer_zero_node
);
6812 /* Hack. We don't want the middle-end to warn that this return
6813 is unreachable, so we mark its location as special. Using
6814 UNKNOWN_LOCATION has the problem that it gets clobbered in
6815 annotate_one_with_locus. A cleaner solution might be to
6816 ensure ! should_carry_locus_p (stmt), but that needs a flag.
6818 SET_EXPR_LOCATION (stmt
, BUILTINS_LOCATION
);
6821 /* Tie off the statement tree for this function. */
6822 DECL_SAVED_TREE (fndecl
) = pop_stmt_list (DECL_SAVED_TREE (fndecl
));
6824 finish_fname_decls ();
6826 /* Complain if there's just no return statement. */
6827 if (warn_return_type
6828 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl
))) != VOID_TYPE
6829 && !current_function_returns_value
&& !current_function_returns_null
6830 /* Don't complain if we are no-return. */
6831 && !current_function_returns_abnormally
6832 /* Don't warn for main(). */
6833 && !MAIN_NAME_P (DECL_NAME (fndecl
))
6834 /* Or if they didn't actually specify a return type. */
6835 && !C_FUNCTION_IMPLICIT_INT (fndecl
)
6836 /* Normally, with -Wreturn-type, flow will complain, but we might
6837 optimize out static functions. */
6838 && !TREE_PUBLIC (fndecl
))
6840 warning (OPT_Wreturn_type
,
6841 "no return statement in function returning non-void");
6842 TREE_NO_WARNING (fndecl
) = 1;
6845 /* Store the end of the function, so that we get good line number
6846 info for the epilogue. */
6847 cfun
->function_end_locus
= input_location
;
6849 /* Finalize the ELF visibility for the function. */
6850 c_determine_visibility (fndecl
);
6852 /* For GNU C extern inline functions disregard inline limits. */
6853 if (DECL_EXTERNAL (fndecl
)
6854 && DECL_DECLARED_INLINE_P (fndecl
))
6855 DECL_DISREGARD_INLINE_LIMITS (fndecl
) = 1;
6857 /* Genericize before inlining. Delay genericizing nested functions
6858 until their parent function is genericized. Since finalizing
6859 requires GENERIC, delay that as well. */
6861 if (DECL_INITIAL (fndecl
) && DECL_INITIAL (fndecl
) != error_mark_node
6862 && !undef_nested_function
)
6864 if (!decl_function_context (fndecl
))
6866 c_genericize (fndecl
);
6867 c_gimple_diagnostics_recursively (fndecl
);
6869 /* ??? Objc emits functions after finalizing the compilation unit.
6870 This should be cleaned up later and this conditional removed. */
6871 if (cgraph_global_info_ready
)
6873 cgraph_add_new_function (fndecl
, false);
6877 cgraph_finalize_function (fndecl
, false);
6881 /* Register this function with cgraph just far enough to get it
6882 added to our parent's nested function list. Handy, since the
6883 C front end doesn't have such a list. */
6884 (void) cgraph_node (fndecl
);
6888 if (!decl_function_context (fndecl
))
6889 undef_nested_function
= false;
6891 /* We're leaving the context of this function, so zap cfun.
6892 It's still in DECL_STRUCT_FUNCTION, and we'll restore it in
6893 tree_rest_of_compilation. */
6895 current_function_decl
= NULL
;
6898 /* Check the declarations given in a for-loop for satisfying the C99
6899 constraints. If exactly one such decl is found, return it. */
6902 check_for_loop_decls (void)
6904 struct c_binding
*b
;
6905 tree one_decl
= NULL_TREE
;
6910 static bool hint
= true;
6911 /* If we get here, declarations have been used in a for loop without
6912 the C99 for loop scope. This doesn't make much sense, so don't
6914 error ("%<for%> loop initial declarations are only allowed in C99 mode");
6917 inform (input_location
,
6918 "use option -std=c99 or -std=gnu99 to compile your code");
6923 /* C99 subclause 6.8.5 paragraph 3:
6925 [#3] The declaration part of a for statement shall only
6926 declare identifiers for objects having storage class auto or
6929 It isn't clear whether, in this sentence, "identifiers" binds to
6930 "shall only declare" or to "objects" - that is, whether all identifiers
6931 declared must be identifiers for objects, or whether the restriction
6932 only applies to those that are. (A question on this in comp.std.c
6933 in November 2000 received no answer.) We implement the strictest
6934 interpretation, to avoid creating an extension which later causes
6937 for (b
= current_scope
->bindings
; b
; b
= b
->prev
)
6940 tree decl
= b
->decl
;
6945 switch (TREE_CODE (decl
))
6948 if (TREE_STATIC (decl
))
6949 error ("declaration of static variable %q+D in %<for%> loop "
6950 "initial declaration", decl
);
6951 else if (DECL_EXTERNAL (decl
))
6952 error ("declaration of %<extern%> variable %q+D in %<for%> loop "
6953 "initial declaration", decl
);
6957 error ("%<struct %E%> declared in %<for%> loop initial declaration",
6961 error ("%<union %E%> declared in %<for%> loop initial declaration",
6965 error ("%<enum %E%> declared in %<for%> loop initial declaration",
6969 error ("declaration of non-variable %q+D in %<for%> loop "
6970 "initial declaration", decl
);
6977 return n_decls
== 1 ? one_decl
: NULL_TREE
;
6980 /* Save and reinitialize the variables
6981 used during compilation of a C function. */
6984 c_push_function_context (void)
6986 struct language_function
*p
;
6987 p
= GGC_NEW (struct language_function
);
6990 p
->base
.x_stmt_tree
= c_stmt_tree
;
6991 p
->x_break_label
= c_break_label
;
6992 p
->x_cont_label
= c_cont_label
;
6993 p
->x_switch_stack
= c_switch_stack
;
6994 p
->arg_info
= current_function_arg_info
;
6995 p
->returns_value
= current_function_returns_value
;
6996 p
->returns_null
= current_function_returns_null
;
6997 p
->returns_abnormally
= current_function_returns_abnormally
;
6998 p
->warn_about_return_type
= warn_about_return_type
;
7000 push_function_context ();
7003 /* Restore the variables used during compilation of a C function. */
7006 c_pop_function_context (void)
7008 struct language_function
*p
;
7010 pop_function_context ();
7012 cfun
->language
= NULL
;
7014 if (DECL_STRUCT_FUNCTION (current_function_decl
) == 0
7015 && DECL_SAVED_TREE (current_function_decl
) == NULL_TREE
)
7017 /* Stop pointing to the local nodes about to be freed. */
7018 /* But DECL_INITIAL must remain nonzero so we know this
7019 was an actual function definition. */
7020 DECL_INITIAL (current_function_decl
) = error_mark_node
;
7021 DECL_ARGUMENTS (current_function_decl
) = 0;
7024 c_stmt_tree
= p
->base
.x_stmt_tree
;
7025 c_break_label
= p
->x_break_label
;
7026 c_cont_label
= p
->x_cont_label
;
7027 c_switch_stack
= p
->x_switch_stack
;
7028 current_function_arg_info
= p
->arg_info
;
7029 current_function_returns_value
= p
->returns_value
;
7030 current_function_returns_null
= p
->returns_null
;
7031 current_function_returns_abnormally
= p
->returns_abnormally
;
7032 warn_about_return_type
= p
->warn_about_return_type
;
7035 /* Copy the DECL_LANG_SPECIFIC data associated with DECL. */
7038 c_dup_lang_specific_decl (tree decl
)
7040 struct lang_decl
*ld
;
7042 if (!DECL_LANG_SPECIFIC (decl
))
7045 ld
= GGC_NEW (struct lang_decl
);
7046 memcpy (ld
, DECL_LANG_SPECIFIC (decl
), sizeof (struct lang_decl
));
7047 DECL_LANG_SPECIFIC (decl
) = ld
;
7050 /* The functions below are required for functionality of doing
7051 function at once processing in the C front end. Currently these
7052 functions are not called from anywhere in the C front end, but as
7053 these changes continue, that will change. */
7055 /* Returns the stmt_tree (if any) to which statements are currently
7056 being added. If there is no active statement-tree, NULL is
7060 current_stmt_tree (void)
7062 return &c_stmt_tree
;
7065 /* Return the global value of T as a symbol. */
7068 identifier_global_value (tree t
)
7070 struct c_binding
*b
;
7072 for (b
= I_SYMBOL_BINDING (t
); b
; b
= b
->shadowed
)
7073 if (B_IN_FILE_SCOPE (b
) || B_IN_EXTERNAL_SCOPE (b
))
7079 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
7080 otherwise the name is found in ridpointers from RID_INDEX. */
7083 record_builtin_type (enum rid rid_index
, const char *name
, tree type
)
7087 id
= ridpointers
[(int) rid_index
];
7089 id
= get_identifier (name
);
7090 decl
= build_decl (TYPE_DECL
, id
, type
);
7092 if (debug_hooks
->type_decl
)
7093 debug_hooks
->type_decl (decl
, false);
7096 /* Build the void_list_node (void_type_node having been created). */
7098 build_void_list_node (void)
7100 tree t
= build_tree_list (NULL_TREE
, void_type_node
);
7104 /* Return a c_parm structure with the given SPECS, ATTRS and DECLARATOR. */
7107 build_c_parm (struct c_declspecs
*specs
, tree attrs
,
7108 struct c_declarator
*declarator
)
7110 struct c_parm
*ret
= XOBNEW (&parser_obstack
, struct c_parm
);
7113 ret
->declarator
= declarator
;
7117 /* Return a declarator with nested attributes. TARGET is the inner
7118 declarator to which these attributes apply. ATTRS are the
7121 struct c_declarator
*
7122 build_attrs_declarator (tree attrs
, struct c_declarator
*target
)
7124 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
7125 ret
->kind
= cdk_attrs
;
7126 ret
->declarator
= target
;
7127 ret
->u
.attrs
= attrs
;
7131 /* Return a declarator for a function with arguments specified by ARGS
7132 and return type specified by TARGET. */
7134 struct c_declarator
*
7135 build_function_declarator (struct c_arg_info
*args
,
7136 struct c_declarator
*target
)
7138 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
7139 ret
->kind
= cdk_function
;
7140 ret
->declarator
= target
;
7141 ret
->u
.arg_info
= args
;
7145 /* Return a declarator for the identifier IDENT (which may be
7146 NULL_TREE for an abstract declarator). */
7148 struct c_declarator
*
7149 build_id_declarator (tree ident
)
7151 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
7153 ret
->declarator
= 0;
7155 /* Default value - may get reset to a more precise location. */
7156 ret
->id_loc
= input_location
;
7160 /* Return something to represent absolute declarators containing a *.
7161 TARGET is the absolute declarator that the * contains.
7162 TYPE_QUALS_ATTRS is a structure for type qualifiers and attributes
7163 to apply to the pointer type. */
7165 struct c_declarator
*
7166 make_pointer_declarator (struct c_declspecs
*type_quals_attrs
,
7167 struct c_declarator
*target
)
7171 struct c_declarator
*itarget
= target
;
7172 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
7173 if (type_quals_attrs
)
7175 attrs
= type_quals_attrs
->attrs
;
7176 quals
= quals_from_declspecs (type_quals_attrs
);
7177 if (attrs
!= NULL_TREE
)
7178 itarget
= build_attrs_declarator (attrs
, target
);
7180 ret
->kind
= cdk_pointer
;
7181 ret
->declarator
= itarget
;
7182 ret
->u
.pointer_quals
= quals
;
7186 /* Return a pointer to a structure for an empty list of declaration
7189 struct c_declspecs
*
7190 build_null_declspecs (void)
7192 struct c_declspecs
*ret
= XOBNEW (&parser_obstack
, struct c_declspecs
);
7197 ret
->typespec_word
= cts_none
;
7198 ret
->storage_class
= csc_none
;
7199 ret
->expr_const_operands
= true;
7200 ret
->declspecs_seen_p
= false;
7201 ret
->type_seen_p
= false;
7202 ret
->non_sc_seen_p
= false;
7203 ret
->typedef_p
= false;
7204 ret
->tag_defined_p
= false;
7205 ret
->explicit_signed_p
= false;
7206 ret
->deprecated_p
= false;
7207 ret
->default_int_p
= false;
7208 ret
->long_p
= false;
7209 ret
->long_long_p
= false;
7210 ret
->short_p
= false;
7211 ret
->signed_p
= false;
7212 ret
->unsigned_p
= false;
7213 ret
->complex_p
= false;
7214 ret
->inline_p
= false;
7215 ret
->thread_p
= false;
7216 ret
->const_p
= false;
7217 ret
->volatile_p
= false;
7218 ret
->restrict_p
= false;
7219 ret
->saturating_p
= false;
7223 /* Add the type qualifier QUAL to the declaration specifiers SPECS,
7226 struct c_declspecs
*
7227 declspecs_add_qual (struct c_declspecs
*specs
, tree qual
)
7231 specs
->non_sc_seen_p
= true;
7232 specs
->declspecs_seen_p
= true;
7233 gcc_assert (TREE_CODE (qual
) == IDENTIFIER_NODE
7234 && C_IS_RESERVED_WORD (qual
));
7235 i
= C_RID_CODE (qual
);
7239 dupe
= specs
->const_p
;
7240 specs
->const_p
= true;
7243 dupe
= specs
->volatile_p
;
7244 specs
->volatile_p
= true;
7247 dupe
= specs
->restrict_p
;
7248 specs
->restrict_p
= true;
7253 if (dupe
&& !flag_isoc99
)
7254 pedwarn (input_location
, OPT_pedantic
, "duplicate %qE", qual
);
7258 /* Add the type specifier TYPE to the declaration specifiers SPECS,
7261 struct c_declspecs
*
7262 declspecs_add_type (struct c_declspecs
*specs
, struct c_typespec spec
)
7264 tree type
= spec
.spec
;
7266 invoke_plugin_callbacks (PLUGIN_FINISH_TYPE
, type
);
7268 specs
->non_sc_seen_p
= true;
7269 specs
->declspecs_seen_p
= true;
7270 specs
->type_seen_p
= true;
7271 if (TREE_DEPRECATED (type
))
7272 specs
->deprecated_p
= true;
7274 /* Handle type specifier keywords. */
7275 if (TREE_CODE (type
) == IDENTIFIER_NODE
7276 && C_IS_RESERVED_WORD (type
)
7277 && C_RID_CODE (type
) != RID_CXX_COMPAT_WARN
)
7279 enum rid i
= C_RID_CODE (type
);
7282 error ("two or more data types in declaration specifiers");
7285 if ((int) i
<= (int) RID_LAST_MODIFIER
)
7287 /* "long", "short", "signed", "unsigned", "_Complex" or "_Sat". */
7292 if (specs
->long_long_p
)
7294 error ("%<long long long%> is too long for GCC");
7299 if (specs
->typespec_word
== cts_double
)
7301 error ("both %<long long%> and %<double%> in "
7302 "declaration specifiers");
7305 if (pedantic
&& !flag_isoc99
&& !in_system_header
)
7306 pedwarn (input_location
, OPT_Wlong_long
, "ISO C90 does not support %<long long%>");
7307 specs
->long_long_p
= 1;
7311 error ("both %<long%> and %<short%> in "
7312 "declaration specifiers");
7313 else if (specs
->typespec_word
== cts_void
)
7314 error ("both %<long%> and %<void%> in "
7315 "declaration specifiers");
7316 else if (specs
->typespec_word
== cts_bool
)
7317 error ("both %<long%> and %<_Bool%> in "
7318 "declaration specifiers");
7319 else if (specs
->typespec_word
== cts_char
)
7320 error ("both %<long%> and %<char%> in "
7321 "declaration specifiers");
7322 else if (specs
->typespec_word
== cts_float
)
7323 error ("both %<long%> and %<float%> in "
7324 "declaration specifiers");
7325 else if (specs
->typespec_word
== cts_dfloat32
)
7326 error ("both %<long%> and %<_Decimal32%> in "
7327 "declaration specifiers");
7328 else if (specs
->typespec_word
== cts_dfloat64
)
7329 error ("both %<long%> and %<_Decimal64%> in "
7330 "declaration specifiers");
7331 else if (specs
->typespec_word
== cts_dfloat128
)
7332 error ("both %<long%> and %<_Decimal128%> in "
7333 "declaration specifiers");
7335 specs
->long_p
= true;
7338 dupe
= specs
->short_p
;
7340 error ("both %<long%> and %<short%> in "
7341 "declaration specifiers");
7342 else if (specs
->typespec_word
== cts_void
)
7343 error ("both %<short%> and %<void%> in "
7344 "declaration specifiers");
7345 else if (specs
->typespec_word
== cts_bool
)
7346 error ("both %<short%> and %<_Bool%> in "
7347 "declaration specifiers");
7348 else if (specs
->typespec_word
== cts_char
)
7349 error ("both %<short%> and %<char%> in "
7350 "declaration specifiers");
7351 else if (specs
->typespec_word
== cts_float
)
7352 error ("both %<short%> and %<float%> in "
7353 "declaration specifiers");
7354 else if (specs
->typespec_word
== cts_double
)
7355 error ("both %<short%> and %<double%> in "
7356 "declaration specifiers");
7357 else if (specs
->typespec_word
== cts_dfloat32
)
7358 error ("both %<short%> and %<_Decimal32%> in "
7359 "declaration specifiers");
7360 else if (specs
->typespec_word
== cts_dfloat64
)
7361 error ("both %<short%> and %<_Decimal64%> in "
7362 "declaration specifiers");
7363 else if (specs
->typespec_word
== cts_dfloat128
)
7364 error ("both %<short%> and %<_Decimal128%> in "
7365 "declaration specifiers");
7367 specs
->short_p
= true;
7370 dupe
= specs
->signed_p
;
7371 if (specs
->unsigned_p
)
7372 error ("both %<signed%> and %<unsigned%> in "
7373 "declaration specifiers");
7374 else if (specs
->typespec_word
== cts_void
)
7375 error ("both %<signed%> and %<void%> in "
7376 "declaration specifiers");
7377 else if (specs
->typespec_word
== cts_bool
)
7378 error ("both %<signed%> and %<_Bool%> in "
7379 "declaration specifiers");
7380 else if (specs
->typespec_word
== cts_float
)
7381 error ("both %<signed%> and %<float%> in "
7382 "declaration specifiers");
7383 else if (specs
->typespec_word
== cts_double
)
7384 error ("both %<signed%> and %<double%> in "
7385 "declaration specifiers");
7386 else if (specs
->typespec_word
== cts_dfloat32
)
7387 error ("both %<signed%> and %<_Decimal32%> in "
7388 "declaration specifiers");
7389 else if (specs
->typespec_word
== cts_dfloat64
)
7390 error ("both %<signed%> and %<_Decimal64%> in "
7391 "declaration specifiers");
7392 else if (specs
->typespec_word
== cts_dfloat128
)
7393 error ("both %<signed%> and %<_Decimal128%> in "
7394 "declaration specifiers");
7396 specs
->signed_p
= true;
7399 dupe
= specs
->unsigned_p
;
7400 if (specs
->signed_p
)
7401 error ("both %<signed%> and %<unsigned%> in "
7402 "declaration specifiers");
7403 else if (specs
->typespec_word
== cts_void
)
7404 error ("both %<unsigned%> and %<void%> in "
7405 "declaration specifiers");
7406 else if (specs
->typespec_word
== cts_bool
)
7407 error ("both %<unsigned%> and %<_Bool%> in "
7408 "declaration specifiers");
7409 else if (specs
->typespec_word
== cts_float
)
7410 error ("both %<unsigned%> and %<float%> in "
7411 "declaration specifiers");
7412 else if (specs
->typespec_word
== cts_double
)
7413 error ("both %<unsigned%> and %<double%> in "
7414 "declaration specifiers");
7415 else if (specs
->typespec_word
== cts_dfloat32
)
7416 error ("both %<unsigned%> and %<_Decimal32%> in "
7417 "declaration specifiers");
7418 else if (specs
->typespec_word
== cts_dfloat64
)
7419 error ("both %<unsigned%> and %<_Decimal64%> in "
7420 "declaration specifiers");
7421 else if (specs
->typespec_word
== cts_dfloat128
)
7422 error ("both %<unsigned%> and %<_Decimal128%> in "
7423 "declaration specifiers");
7425 specs
->unsigned_p
= true;
7428 dupe
= specs
->complex_p
;
7429 if (!flag_isoc99
&& !in_system_header
)
7430 pedwarn (input_location
, OPT_pedantic
, "ISO C90 does not support complex types");
7431 if (specs
->typespec_word
== cts_void
)
7432 error ("both %<complex%> and %<void%> in "
7433 "declaration specifiers");
7434 else if (specs
->typespec_word
== cts_bool
)
7435 error ("both %<complex%> and %<_Bool%> in "
7436 "declaration specifiers");
7437 else if (specs
->typespec_word
== cts_dfloat32
)
7438 error ("both %<complex%> and %<_Decimal32%> in "
7439 "declaration specifiers");
7440 else if (specs
->typespec_word
== cts_dfloat64
)
7441 error ("both %<complex%> and %<_Decimal64%> in "
7442 "declaration specifiers");
7443 else if (specs
->typespec_word
== cts_dfloat128
)
7444 error ("both %<complex%> and %<_Decimal128%> in "
7445 "declaration specifiers");
7446 else if (specs
->typespec_word
== cts_fract
)
7447 error ("both %<complex%> and %<_Fract%> in "
7448 "declaration specifiers");
7449 else if (specs
->typespec_word
== cts_accum
)
7450 error ("both %<complex%> and %<_Accum%> in "
7451 "declaration specifiers");
7452 else if (specs
->saturating_p
)
7453 error ("both %<complex%> and %<_Sat%> in "
7454 "declaration specifiers");
7456 specs
->complex_p
= true;
7459 dupe
= specs
->saturating_p
;
7460 pedwarn (input_location
, OPT_pedantic
, "ISO C does not support saturating types");
7461 if (specs
->typespec_word
== cts_void
)
7462 error ("both %<_Sat%> and %<void%> in "
7463 "declaration specifiers");
7464 else if (specs
->typespec_word
== cts_bool
)
7465 error ("both %<_Sat%> and %<_Bool%> in "
7466 "declaration specifiers");
7467 else if (specs
->typespec_word
== cts_char
)
7468 error ("both %<_Sat%> and %<char%> in "
7469 "declaration specifiers");
7470 else if (specs
->typespec_word
== cts_int
)
7471 error ("both %<_Sat%> and %<int%> in "
7472 "declaration specifiers");
7473 else if (specs
->typespec_word
== cts_float
)
7474 error ("both %<_Sat%> and %<float%> in "
7475 "declaration specifiers");
7476 else if (specs
->typespec_word
== cts_double
)
7477 error ("both %<_Sat%> and %<double%> in "
7478 "declaration specifiers");
7479 else if (specs
->typespec_word
== cts_dfloat32
)
7480 error ("both %<_Sat%> and %<_Decimal32%> in "
7481 "declaration specifiers");
7482 else if (specs
->typespec_word
== cts_dfloat64
)
7483 error ("both %<_Sat%> and %<_Decimal64%> in "
7484 "declaration specifiers");
7485 else if (specs
->typespec_word
== cts_dfloat128
)
7486 error ("both %<_Sat%> and %<_Decimal128%> in "
7487 "declaration specifiers");
7488 else if (specs
->complex_p
)
7489 error ("both %<_Sat%> and %<complex%> in "
7490 "declaration specifiers");
7492 specs
->saturating_p
= true;
7499 error ("duplicate %qE", type
);
7505 /* "void", "_Bool", "char", "int", "float", "double", "_Decimal32",
7506 "_Decimal64", "_Decimal128", "_Fract" or "_Accum". */
7507 if (specs
->typespec_word
!= cts_none
)
7509 error ("two or more data types in declaration specifiers");
7516 error ("both %<long%> and %<void%> in "
7517 "declaration specifiers");
7518 else if (specs
->short_p
)
7519 error ("both %<short%> and %<void%> in "
7520 "declaration specifiers");
7521 else if (specs
->signed_p
)
7522 error ("both %<signed%> and %<void%> in "
7523 "declaration specifiers");
7524 else if (specs
->unsigned_p
)
7525 error ("both %<unsigned%> and %<void%> in "
7526 "declaration specifiers");
7527 else if (specs
->complex_p
)
7528 error ("both %<complex%> and %<void%> in "
7529 "declaration specifiers");
7530 else if (specs
->saturating_p
)
7531 error ("both %<_Sat%> and %<void%> in "
7532 "declaration specifiers");
7534 specs
->typespec_word
= cts_void
;
7538 error ("both %<long%> and %<_Bool%> in "
7539 "declaration specifiers");
7540 else if (specs
->short_p
)
7541 error ("both %<short%> and %<_Bool%> in "
7542 "declaration specifiers");
7543 else if (specs
->signed_p
)
7544 error ("both %<signed%> and %<_Bool%> in "
7545 "declaration specifiers");
7546 else if (specs
->unsigned_p
)
7547 error ("both %<unsigned%> and %<_Bool%> in "
7548 "declaration specifiers");
7549 else if (specs
->complex_p
)
7550 error ("both %<complex%> and %<_Bool%> in "
7551 "declaration specifiers");
7552 else if (specs
->saturating_p
)
7553 error ("both %<_Sat%> and %<_Bool%> in "
7554 "declaration specifiers");
7556 specs
->typespec_word
= cts_bool
;
7560 error ("both %<long%> and %<char%> in "
7561 "declaration specifiers");
7562 else if (specs
->short_p
)
7563 error ("both %<short%> and %<char%> in "
7564 "declaration specifiers");
7565 else if (specs
->saturating_p
)
7566 error ("both %<_Sat%> and %<char%> in "
7567 "declaration specifiers");
7569 specs
->typespec_word
= cts_char
;
7572 if (specs
->saturating_p
)
7573 error ("both %<_Sat%> and %<int%> in "
7574 "declaration specifiers");
7576 specs
->typespec_word
= cts_int
;
7580 error ("both %<long%> and %<float%> in "
7581 "declaration specifiers");
7582 else if (specs
->short_p
)
7583 error ("both %<short%> and %<float%> in "
7584 "declaration specifiers");
7585 else if (specs
->signed_p
)
7586 error ("both %<signed%> and %<float%> in "
7587 "declaration specifiers");
7588 else if (specs
->unsigned_p
)
7589 error ("both %<unsigned%> and %<float%> in "
7590 "declaration specifiers");
7591 else if (specs
->saturating_p
)
7592 error ("both %<_Sat%> and %<float%> in "
7593 "declaration specifiers");
7595 specs
->typespec_word
= cts_float
;
7598 if (specs
->long_long_p
)
7599 error ("both %<long long%> and %<double%> in "
7600 "declaration specifiers");
7601 else if (specs
->short_p
)
7602 error ("both %<short%> and %<double%> in "
7603 "declaration specifiers");
7604 else if (specs
->signed_p
)
7605 error ("both %<signed%> and %<double%> in "
7606 "declaration specifiers");
7607 else if (specs
->unsigned_p
)
7608 error ("both %<unsigned%> and %<double%> in "
7609 "declaration specifiers");
7610 else if (specs
->saturating_p
)
7611 error ("both %<_Sat%> and %<double%> in "
7612 "declaration specifiers");
7614 specs
->typespec_word
= cts_double
;
7621 if (i
== RID_DFLOAT32
)
7623 else if (i
== RID_DFLOAT64
)
7626 str
= "_Decimal128";
7627 if (specs
->long_long_p
)
7628 error ("both %<long long%> and %<%s%> in "
7629 "declaration specifiers", str
);
7631 error ("both %<long%> and %<%s%> in "
7632 "declaration specifiers", str
);
7633 else if (specs
->short_p
)
7634 error ("both %<short%> and %<%s%> in "
7635 "declaration specifiers", str
);
7636 else if (specs
->signed_p
)
7637 error ("both %<signed%> and %<%s%> in "
7638 "declaration specifiers", str
);
7639 else if (specs
->unsigned_p
)
7640 error ("both %<unsigned%> and %<%s%> in "
7641 "declaration specifiers", str
);
7642 else if (specs
->complex_p
)
7643 error ("both %<complex%> and %<%s%> in "
7644 "declaration specifiers", str
);
7645 else if (specs
->saturating_p
)
7646 error ("both %<_Sat%> and %<%s%> in "
7647 "declaration specifiers", str
);
7648 else if (i
== RID_DFLOAT32
)
7649 specs
->typespec_word
= cts_dfloat32
;
7650 else if (i
== RID_DFLOAT64
)
7651 specs
->typespec_word
= cts_dfloat64
;
7653 specs
->typespec_word
= cts_dfloat128
;
7655 if (!targetm
.decimal_float_supported_p ())
7656 error ("decimal floating point not supported for this target");
7657 pedwarn (input_location
, OPT_pedantic
,
7658 "ISO C does not support decimal floating point");
7668 if (specs
->complex_p
)
7669 error ("both %<complex%> and %<%s%> in "
7670 "declaration specifiers", str
);
7671 else if (i
== RID_FRACT
)
7672 specs
->typespec_word
= cts_fract
;
7674 specs
->typespec_word
= cts_accum
;
7676 if (!targetm
.fixed_point_supported_p ())
7677 error ("fixed-point types not supported for this target");
7678 pedwarn (input_location
, OPT_pedantic
,
7679 "ISO C does not support fixed-point types");
7682 /* ObjC reserved word "id", handled below. */
7688 /* Now we have a typedef (a TYPE_DECL node), an identifier (some
7689 form of ObjC type, cases such as "int" and "long" being handled
7690 above), a TYPE (struct, union, enum and typeof specifiers) or an
7691 ERROR_MARK. In none of these cases may there have previously
7692 been any type specifiers. */
7693 if (specs
->type
|| specs
->typespec_word
!= cts_none
7694 || specs
->long_p
|| specs
->short_p
|| specs
->signed_p
7695 || specs
->unsigned_p
|| specs
->complex_p
)
7696 error ("two or more data types in declaration specifiers");
7697 else if (TREE_CODE (type
) == TYPE_DECL
)
7699 if (TREE_TYPE (type
) == error_mark_node
)
7700 ; /* Allow the type to default to int to avoid cascading errors. */
7703 specs
->type
= TREE_TYPE (type
);
7704 specs
->decl_attr
= DECL_ATTRIBUTES (type
);
7705 specs
->typedef_p
= true;
7706 specs
->explicit_signed_p
= C_TYPEDEF_EXPLICITLY_SIGNED (type
);
7709 else if (TREE_CODE (type
) == IDENTIFIER_NODE
)
7711 tree t
= lookup_name (type
);
7712 if (!t
|| TREE_CODE (t
) != TYPE_DECL
)
7713 error ("%qE fails to be a typedef or built in type", type
);
7714 else if (TREE_TYPE (t
) == error_mark_node
)
7717 specs
->type
= TREE_TYPE (t
);
7719 else if (TREE_CODE (type
) != ERROR_MARK
)
7721 if (spec
.kind
== ctsk_tagdef
|| spec
.kind
== ctsk_tagfirstref
)
7722 specs
->tag_defined_p
= true;
7723 if (spec
.kind
== ctsk_typeof
)
7725 specs
->typedef_p
= true;
7729 specs
->expr
= build2 (COMPOUND_EXPR
, TREE_TYPE (spec
.expr
),
7730 specs
->expr
, spec
.expr
);
7732 specs
->expr
= spec
.expr
;
7733 specs
->expr_const_operands
&= spec
.expr_const_operands
;
7742 /* Add the storage class specifier or function specifier SCSPEC to the
7743 declaration specifiers SPECS, returning SPECS. */
7745 struct c_declspecs
*
7746 declspecs_add_scspec (struct c_declspecs
*specs
, tree scspec
)
7749 enum c_storage_class n
= csc_none
;
7751 specs
->declspecs_seen_p
= true;
7752 gcc_assert (TREE_CODE (scspec
) == IDENTIFIER_NODE
7753 && C_IS_RESERVED_WORD (scspec
));
7754 i
= C_RID_CODE (scspec
);
7755 if (specs
->non_sc_seen_p
)
7756 warning (OPT_Wold_style_declaration
,
7757 "%qE is not at beginning of declaration", scspec
);
7761 /* C99 permits duplicate inline. Although of doubtful utility,
7762 it seems simplest to permit it in gnu89 mode as well, as
7763 there is also little utility in maintaining this as a
7764 difference between gnu89 and C99 inline. */
7766 specs
->inline_p
= true;
7769 dupe
= specs
->thread_p
;
7770 if (specs
->storage_class
== csc_auto
)
7771 error ("%<__thread%> used with %<auto%>");
7772 else if (specs
->storage_class
== csc_register
)
7773 error ("%<__thread%> used with %<register%>");
7774 else if (specs
->storage_class
== csc_typedef
)
7775 error ("%<__thread%> used with %<typedef%>");
7777 specs
->thread_p
= true;
7784 /* Diagnose "__thread extern". */
7785 if (specs
->thread_p
)
7786 error ("%<__thread%> before %<extern%>");
7793 /* Diagnose "__thread static". */
7794 if (specs
->thread_p
)
7795 error ("%<__thread%> before %<static%>");
7803 if (n
!= csc_none
&& n
== specs
->storage_class
)
7806 error ("duplicate %qE", scspec
);
7809 if (specs
->storage_class
!= csc_none
&& n
!= specs
->storage_class
)
7811 error ("multiple storage classes in declaration specifiers");
7815 specs
->storage_class
= n
;
7816 if (n
!= csc_extern
&& n
!= csc_static
&& specs
->thread_p
)
7818 error ("%<__thread%> used with %qE", scspec
);
7819 specs
->thread_p
= false;
7826 /* Add the attributes ATTRS to the declaration specifiers SPECS,
7829 struct c_declspecs
*
7830 declspecs_add_attrs (struct c_declspecs
*specs
, tree attrs
)
7832 specs
->attrs
= chainon (attrs
, specs
->attrs
);
7833 specs
->declspecs_seen_p
= true;
7837 /* Combine "long", "short", "signed", "unsigned" and "_Complex" type
7838 specifiers with any other type specifier to determine the resulting
7839 type. This is where ISO C checks on complex types are made, since
7840 "_Complex long" is a prefix of the valid ISO C type "_Complex long
7843 struct c_declspecs
*
7844 finish_declspecs (struct c_declspecs
*specs
)
7846 /* If a type was specified as a whole, we have no modifiers and are
7848 if (specs
->type
!= NULL_TREE
)
7850 gcc_assert (!specs
->long_p
&& !specs
->long_long_p
&& !specs
->short_p
7851 && !specs
->signed_p
&& !specs
->unsigned_p
7852 && !specs
->complex_p
);
7856 /* If none of "void", "_Bool", "char", "int", "float" or "double"
7857 has been specified, treat it as "int" unless "_Complex" is
7858 present and there are no other specifiers. If we just have
7859 "_Complex", it is equivalent to "_Complex double", but e.g.
7860 "_Complex short" is equivalent to "_Complex short int". */
7861 if (specs
->typespec_word
== cts_none
)
7863 if (specs
->saturating_p
)
7865 error ("%<_Sat%> is used without %<_Fract%> or %<_Accum%>");
7866 if (!targetm
.fixed_point_supported_p ())
7867 error ("fixed-point types not supported for this target");
7868 specs
->typespec_word
= cts_fract
;
7870 else if (specs
->long_p
|| specs
->short_p
7871 || specs
->signed_p
|| specs
->unsigned_p
)
7873 specs
->typespec_word
= cts_int
;
7875 else if (specs
->complex_p
)
7877 specs
->typespec_word
= cts_double
;
7878 pedwarn (input_location
, OPT_pedantic
,
7879 "ISO C does not support plain %<complex%> meaning "
7880 "%<double complex%>");
7884 specs
->typespec_word
= cts_int
;
7885 specs
->default_int_p
= true;
7886 /* We don't diagnose this here because grokdeclarator will
7887 give more specific diagnostics according to whether it is
7888 a function definition. */
7892 /* If "signed" was specified, record this to distinguish "int" and
7893 "signed int" in the case of a bit-field with
7894 -funsigned-bitfields. */
7895 specs
->explicit_signed_p
= specs
->signed_p
;
7897 /* Now compute the actual type. */
7898 switch (specs
->typespec_word
)
7901 gcc_assert (!specs
->long_p
&& !specs
->short_p
7902 && !specs
->signed_p
&& !specs
->unsigned_p
7903 && !specs
->complex_p
);
7904 specs
->type
= void_type_node
;
7907 gcc_assert (!specs
->long_p
&& !specs
->short_p
7908 && !specs
->signed_p
&& !specs
->unsigned_p
7909 && !specs
->complex_p
);
7910 specs
->type
= boolean_type_node
;
7913 gcc_assert (!specs
->long_p
&& !specs
->short_p
);
7914 gcc_assert (!(specs
->signed_p
&& specs
->unsigned_p
));
7915 if (specs
->signed_p
)
7916 specs
->type
= signed_char_type_node
;
7917 else if (specs
->unsigned_p
)
7918 specs
->type
= unsigned_char_type_node
;
7920 specs
->type
= char_type_node
;
7921 if (specs
->complex_p
)
7923 pedwarn (input_location
, OPT_pedantic
,
7924 "ISO C does not support complex integer types");
7925 specs
->type
= build_complex_type (specs
->type
);
7929 gcc_assert (!(specs
->long_p
&& specs
->short_p
));
7930 gcc_assert (!(specs
->signed_p
&& specs
->unsigned_p
));
7931 if (specs
->long_long_p
)
7932 specs
->type
= (specs
->unsigned_p
7933 ? long_long_unsigned_type_node
7934 : long_long_integer_type_node
);
7935 else if (specs
->long_p
)
7936 specs
->type
= (specs
->unsigned_p
7937 ? long_unsigned_type_node
7938 : long_integer_type_node
);
7939 else if (specs
->short_p
)
7940 specs
->type
= (specs
->unsigned_p
7941 ? short_unsigned_type_node
7942 : short_integer_type_node
);
7944 specs
->type
= (specs
->unsigned_p
7945 ? unsigned_type_node
7946 : integer_type_node
);
7947 if (specs
->complex_p
)
7949 pedwarn (input_location
, OPT_pedantic
,
7950 "ISO C does not support complex integer types");
7951 specs
->type
= build_complex_type (specs
->type
);
7955 gcc_assert (!specs
->long_p
&& !specs
->short_p
7956 && !specs
->signed_p
&& !specs
->unsigned_p
);
7957 specs
->type
= (specs
->complex_p
7958 ? complex_float_type_node
7962 gcc_assert (!specs
->long_long_p
&& !specs
->short_p
7963 && !specs
->signed_p
&& !specs
->unsigned_p
);
7966 specs
->type
= (specs
->complex_p
7967 ? complex_long_double_type_node
7968 : long_double_type_node
);
7972 specs
->type
= (specs
->complex_p
7973 ? complex_double_type_node
7974 : double_type_node
);
7980 gcc_assert (!specs
->long_p
&& !specs
->long_long_p
&& !specs
->short_p
7981 && !specs
->signed_p
&& !specs
->unsigned_p
&& !specs
->complex_p
);
7982 if (specs
->typespec_word
== cts_dfloat32
)
7983 specs
->type
= dfloat32_type_node
;
7984 else if (specs
->typespec_word
== cts_dfloat64
)
7985 specs
->type
= dfloat64_type_node
;
7987 specs
->type
= dfloat128_type_node
;
7990 gcc_assert (!specs
->complex_p
);
7991 if (!targetm
.fixed_point_supported_p ())
7992 specs
->type
= integer_type_node
;
7993 else if (specs
->saturating_p
)
7995 if (specs
->long_long_p
)
7996 specs
->type
= specs
->unsigned_p
7997 ? sat_unsigned_long_long_fract_type_node
7998 : sat_long_long_fract_type_node
;
7999 else if (specs
->long_p
)
8000 specs
->type
= specs
->unsigned_p
8001 ? sat_unsigned_long_fract_type_node
8002 : sat_long_fract_type_node
;
8003 else if (specs
->short_p
)
8004 specs
->type
= specs
->unsigned_p
8005 ? sat_unsigned_short_fract_type_node
8006 : sat_short_fract_type_node
;
8008 specs
->type
= specs
->unsigned_p
8009 ? sat_unsigned_fract_type_node
8010 : sat_fract_type_node
;
8014 if (specs
->long_long_p
)
8015 specs
->type
= specs
->unsigned_p
8016 ? unsigned_long_long_fract_type_node
8017 : long_long_fract_type_node
;
8018 else if (specs
->long_p
)
8019 specs
->type
= specs
->unsigned_p
8020 ? unsigned_long_fract_type_node
8021 : long_fract_type_node
;
8022 else if (specs
->short_p
)
8023 specs
->type
= specs
->unsigned_p
8024 ? unsigned_short_fract_type_node
8025 : short_fract_type_node
;
8027 specs
->type
= specs
->unsigned_p
8028 ? unsigned_fract_type_node
8033 gcc_assert (!specs
->complex_p
);
8034 if (!targetm
.fixed_point_supported_p ())
8035 specs
->type
= integer_type_node
;
8036 else if (specs
->saturating_p
)
8038 if (specs
->long_long_p
)
8039 specs
->type
= specs
->unsigned_p
8040 ? sat_unsigned_long_long_accum_type_node
8041 : sat_long_long_accum_type_node
;
8042 else if (specs
->long_p
)
8043 specs
->type
= specs
->unsigned_p
8044 ? sat_unsigned_long_accum_type_node
8045 : sat_long_accum_type_node
;
8046 else if (specs
->short_p
)
8047 specs
->type
= specs
->unsigned_p
8048 ? sat_unsigned_short_accum_type_node
8049 : sat_short_accum_type_node
;
8051 specs
->type
= specs
->unsigned_p
8052 ? sat_unsigned_accum_type_node
8053 : sat_accum_type_node
;
8057 if (specs
->long_long_p
)
8058 specs
->type
= specs
->unsigned_p
8059 ? unsigned_long_long_accum_type_node
8060 : long_long_accum_type_node
;
8061 else if (specs
->long_p
)
8062 specs
->type
= specs
->unsigned_p
8063 ? unsigned_long_accum_type_node
8064 : long_accum_type_node
;
8065 else if (specs
->short_p
)
8066 specs
->type
= specs
->unsigned_p
8067 ? unsigned_short_accum_type_node
8068 : short_accum_type_node
;
8070 specs
->type
= specs
->unsigned_p
8071 ? unsigned_accum_type_node
8082 /* A subroutine of c_write_global_declarations. Perform final processing
8083 on one file scope's declarations (or the external scope's declarations),
8087 c_write_global_declarations_1 (tree globals
)
8092 /* Process the decls in the order they were written. */
8093 for (decl
= globals
; decl
; decl
= TREE_CHAIN (decl
))
8095 /* Check for used but undefined static functions using the C
8096 standard's definition of "used", and set TREE_NO_WARNING so
8097 that check_global_declarations doesn't repeat the check. */
8098 if (TREE_CODE (decl
) == FUNCTION_DECL
8099 && DECL_INITIAL (decl
) == 0
8100 && DECL_EXTERNAL (decl
)
8101 && !TREE_PUBLIC (decl
)
8102 && C_DECL_USED (decl
))
8104 pedwarn (input_location
, 0, "%q+F used but never defined", decl
);
8105 TREE_NO_WARNING (decl
) = 1;
8108 wrapup_global_declaration_1 (decl
);
8114 for (decl
= globals
; decl
; decl
= TREE_CHAIN (decl
))
8115 reconsider
|= wrapup_global_declaration_2 (decl
);
8119 for (decl
= globals
; decl
; decl
= TREE_CHAIN (decl
))
8120 check_global_declaration_1 (decl
);
8123 /* A subroutine of c_write_global_declarations Emit debug information for each
8124 of the declarations in GLOBALS. */
8127 c_write_global_declarations_2 (tree globals
)
8131 for (decl
= globals
; decl
; decl
= TREE_CHAIN (decl
))
8132 debug_hooks
->global_decl (decl
);
8135 /* Preserve the external declarations scope across a garbage collect. */
8136 static GTY(()) tree ext_block
;
8139 c_write_global_declarations (void)
8143 /* We don't want to do this if generating a PCH. */
8147 /* Don't waste time on further processing if -fsyntax-only or we've
8148 encountered errors. */
8149 if (flag_syntax_only
|| errorcount
|| sorrycount
)
8152 /* Close the external scope. */
8153 ext_block
= pop_scope ();
8155 gcc_assert (!current_scope
);
8159 tree tmp
= BLOCK_VARS (ext_block
);
8161 FILE * stream
= dump_begin (TDI_tu
, &flags
);
8164 dump_node (tmp
, flags
& ~TDF_SLIM
, stream
);
8165 dump_end (TDI_tu
, stream
);
8169 /* Process all file scopes in this compilation, and the external_scope,
8170 through wrapup_global_declarations and check_global_declarations. */
8171 for (t
= all_translation_units
; t
; t
= TREE_CHAIN (t
))
8172 c_write_global_declarations_1 (BLOCK_VARS (DECL_INITIAL (t
)));
8173 c_write_global_declarations_1 (BLOCK_VARS (ext_block
));
8175 /* We're done parsing; proceed to optimize and emit assembly.
8176 FIXME: shouldn't be the front end's responsibility to call this. */
8179 /* After cgraph has had a chance to emit everything that's going to
8180 be emitted, output debug information for globals. */
8181 if (errorcount
== 0 && sorrycount
== 0)
8183 timevar_push (TV_SYMOUT
);
8184 for (t
= all_translation_units
; t
; t
= TREE_CHAIN (t
))
8185 c_write_global_declarations_2 (BLOCK_VARS (DECL_INITIAL (t
)));
8186 c_write_global_declarations_2 (BLOCK_VARS (ext_block
));
8187 timevar_pop (TV_SYMOUT
);
8193 #include "gt-c-decl.h"