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 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
22 /* Process declarations and symbol lookup for C front end.
23 Also constructs types; the standard scalar types at initialization,
24 and structure, union, array and enum types when they are declared. */
26 /* ??? not all decl nodes are given the most useful possible
27 line numbers. For example, the CONST_DECLs for enum values. */
31 #include "coretypes.h"
35 #include "tree-inline.h"
52 #include "langhooks.h"
53 #include "tree-mudflap.h"
54 #include "tree-gimple.h"
55 #include "diagnostic.h"
56 #include "tree-dump.h"
61 #include "langhooks-def.h"
63 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
65 { NORMAL
, /* Ordinary declaration */
66 FUNCDEF
, /* Function definition */
67 PARM
, /* Declaration of parm before function body */
68 FIELD
, /* Declaration inside struct or union */
69 TYPENAME
}; /* Typename (inside cast or sizeof) */
72 /* Nonzero if we have seen an invalid cross reference
73 to a struct, union, or enum, but not yet printed the message. */
74 tree pending_invalid_xref
;
76 /* File and line to appear in the eventual error message. */
77 location_t pending_invalid_xref_location
;
79 /* True means we've initialized exception handling. */
80 bool c_eh_initialized_p
;
82 /* While defining an enum type, this is 1 plus the last enumerator
83 constant value. Note that will do not have to save this or `enum_overflow'
84 around nested function definition since such a definition could only
85 occur in an enum value expression and we don't use these variables in
88 static tree enum_next_value
;
90 /* Nonzero means that there was overflow computing enum_next_value. */
92 static int enum_overflow
;
94 /* The file and line that the prototype came from if this is an
95 old-style definition; used for diagnostics in
96 store_parm_decls_oldstyle. */
98 static location_t current_function_prototype_locus
;
100 /* The argument information structure for the function currently being
103 static struct c_arg_info
*current_function_arg_info
;
105 /* The obstack on which parser and related data structures, which are
106 not live beyond their top-level declaration or definition, are
108 struct obstack parser_obstack
;
110 /* The current statement tree. */
112 static GTY(()) struct stmt_tree_s c_stmt_tree
;
114 /* State saving variables. */
118 /* Linked list of TRANSLATION_UNIT_DECLS for the translation units
119 included in this invocation. Note that the current translation
120 unit is not included in this list. */
122 static GTY(()) tree all_translation_units
;
124 /* A list of decls to be made automatically visible in each file scope. */
125 static GTY(()) tree visible_builtins
;
127 /* Set to 0 at beginning of a function definition, set to 1 if
128 a return statement that specifies a return value is seen. */
130 int current_function_returns_value
;
132 /* Set to 0 at beginning of a function definition, set to 1 if
133 a return statement with no argument is seen. */
135 int current_function_returns_null
;
137 /* Set to 0 at beginning of a function definition, set to 1 if
138 a call to a noreturn function is seen. */
140 int current_function_returns_abnormally
;
142 /* Set to nonzero by `grokdeclarator' for a function
143 whose return type is defaulted, if warnings for this are desired. */
145 static int warn_about_return_type
;
147 /* Nonzero when starting a function declared `extern inline'. */
149 static int current_extern_inline
;
151 /* True means global_bindings_p should return false even if the scope stack
152 says we are in file scope. */
153 bool c_override_global_bindings_to_false
;
156 /* Each c_binding structure describes one binding of an identifier to
157 a decl. All the decls in a scope - irrespective of namespace - are
158 chained together by the ->prev field, which (as the name implies)
159 runs in reverse order. All the decls in a given namespace bound to
160 a given identifier are chained by the ->shadowed field, which runs
161 from inner to outer scopes.
163 The ->decl field usually points to a DECL node, but there are two
164 exceptions. In the namespace of type tags, the bound entity is a
165 RECORD_TYPE, UNION_TYPE, or ENUMERAL_TYPE node. If an undeclared
166 identifier is encountered, it is bound to error_mark_node to
167 suppress further errors about that identifier in the current
170 The ->type field stores the type of the declaration in this scope;
171 if NULL, the type is the type of the ->decl field. This is only of
172 relevance for objects with external or internal linkage which may
173 be redeclared in inner scopes, forming composite types that only
174 persist for the duration of those scopes. In the external scope,
175 this stores the composite of all the types declared for this
176 object, visible or not. The ->inner_comp field (used only at file
177 scope) stores whether an incomplete array type at file scope was
178 completed at an inner scope to an array size other than 1.
180 The depth field is copied from the scope structure that holds this
181 decl. It is used to preserve the proper ordering of the ->shadowed
182 field (see bind()) and also for a handful of special-case checks.
183 Finally, the invisible bit is true for a decl which should be
184 ignored for purposes of normal name lookup, and the nested bit is
185 true for a decl that's been bound a second time in an inner scope;
186 in all such cases, the binding in the outer scope will have its
187 invisible bit true. */
189 struct c_binding
GTY((chain_next ("%h.prev")))
191 tree decl
; /* the decl bound */
192 tree type
; /* the type in this scope */
193 tree id
; /* the identifier it's bound to */
194 struct c_binding
*prev
; /* the previous decl in this scope */
195 struct c_binding
*shadowed
; /* the innermost decl shadowed by this one */
196 unsigned int depth
: 28; /* depth of this scope */
197 BOOL_BITFIELD invisible
: 1; /* normal lookup should ignore this binding */
198 BOOL_BITFIELD nested
: 1; /* do not set DECL_CONTEXT when popping */
199 BOOL_BITFIELD inner_comp
: 1; /* incomplete array completed in inner scope */
202 #define B_IN_SCOPE(b1, b2) ((b1)->depth == (b2)->depth)
203 #define B_IN_CURRENT_SCOPE(b) ((b)->depth == current_scope->depth)
204 #define B_IN_FILE_SCOPE(b) ((b)->depth == 1 /*file_scope->depth*/)
205 #define B_IN_EXTERNAL_SCOPE(b) ((b)->depth == 0 /*external_scope->depth*/)
207 #define I_SYMBOL_BINDING(node) \
208 (((struct lang_identifier *)IDENTIFIER_NODE_CHECK(node))->symbol_binding)
209 #define I_SYMBOL_DECL(node) \
210 (I_SYMBOL_BINDING(node) ? I_SYMBOL_BINDING(node)->decl : 0)
212 #define I_TAG_BINDING(node) \
213 (((struct lang_identifier *)IDENTIFIER_NODE_CHECK(node))->tag_binding)
214 #define I_TAG_DECL(node) \
215 (I_TAG_BINDING(node) ? I_TAG_BINDING(node)->decl : 0)
217 #define I_LABEL_BINDING(node) \
218 (((struct lang_identifier *)IDENTIFIER_NODE_CHECK(node))->label_binding)
219 #define I_LABEL_DECL(node) \
220 (I_LABEL_BINDING(node) ? I_LABEL_BINDING(node)->decl : 0)
222 /* Each C symbol points to three linked lists of c_binding structures.
223 These describe the values of the identifier in the three different
224 namespaces defined by the language. */
226 struct lang_identifier
GTY(())
228 struct c_common_identifier common_id
;
229 struct c_binding
*symbol_binding
; /* vars, funcs, constants, typedefs */
230 struct c_binding
*tag_binding
; /* struct/union/enum tags */
231 struct c_binding
*label_binding
; /* labels */
234 /* Validate c-lang.c's assumptions. */
235 extern char C_SIZEOF_STRUCT_LANG_IDENTIFIER_isnt_accurate
236 [(sizeof(struct lang_identifier
) == C_SIZEOF_STRUCT_LANG_IDENTIFIER
) ? 1 : -1];
238 /* The resulting tree type. */
241 GTY((desc ("TREE_CODE (&%h.generic) == IDENTIFIER_NODE"),
242 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)")))
244 union tree_node
GTY ((tag ("0"),
245 desc ("tree_node_structure (&%h)")))
247 struct lang_identifier
GTY ((tag ("1"))) identifier
;
250 /* Each c_scope structure describes the complete contents of one
251 scope. Four scopes are distinguished specially: the innermost or
252 current scope, the innermost function scope, the file scope (always
253 the second to outermost) and the outermost or external scope.
255 Most declarations are recorded in the current scope.
257 All normal label declarations are recorded in the innermost
258 function scope, as are bindings of undeclared identifiers to
259 error_mark_node. (GCC permits nested functions as an extension,
260 hence the 'innermost' qualifier.) Explicitly declared labels
261 (using the __label__ extension) appear in the current scope.
263 Being in the file scope (current_scope == file_scope) causes
264 special behavior in several places below. Also, under some
265 conditions the Objective-C front end records declarations in the
266 file scope even though that isn't the current scope.
268 All declarations with external linkage are recorded in the external
269 scope, even if they aren't visible there; this models the fact that
270 such declarations are visible to the entire program, and (with a
271 bit of cleverness, see pushdecl) allows diagnosis of some violations
272 of C99 6.2.2p7 and 6.2.7p2:
274 If, within the same translation unit, the same identifier appears
275 with both internal and external linkage, the behavior is
278 All declarations that refer to the same object or function shall
279 have compatible type; otherwise, the behavior is undefined.
281 Initially only the built-in declarations, which describe compiler
282 intrinsic functions plus a subset of the standard library, are in
285 The order of the blocks list matters, and it is frequently appended
286 to. To avoid having to walk all the way to the end of the list on
287 each insertion, or reverse the list later, we maintain a pointer to
288 the last list entry. (FIXME: It should be feasible to use a reversed
291 The bindings list is strictly in reverse order of declarations;
292 pop_scope relies on this. */
295 struct c_scope
GTY((chain_next ("%h.outer")))
297 /* The scope containing this one. */
298 struct c_scope
*outer
;
300 /* The next outermost function scope. */
301 struct c_scope
*outer_function
;
303 /* All bindings in this scope. */
304 struct c_binding
*bindings
;
306 /* For each scope (except the global one), a chain of BLOCK nodes
307 for all the scopes that were entered and exited one level down. */
311 /* The depth of this scope. Used to keep the ->shadowed chain of
312 bindings sorted innermost to outermost. */
313 unsigned int depth
: 28;
315 /* True if we are currently filling this scope with parameter
317 BOOL_BITFIELD parm_flag
: 1;
319 /* True if we already complained about forward parameter decls
320 in this scope. This prevents double warnings on
321 foo (int a; int b; ...) */
322 BOOL_BITFIELD warned_forward_parm_decls
: 1;
324 /* True if this is the outermost block scope of a function body.
325 This scope contains the parameters, the local variables declared
326 in the outermost block, and all the labels (except those in
327 nested functions, or declared at block scope with __label__). */
328 BOOL_BITFIELD function_body
: 1;
330 /* True means make a BLOCK for this scope no matter what. */
331 BOOL_BITFIELD keep
: 1;
334 /* The scope currently in effect. */
336 static GTY(()) struct c_scope
*current_scope
;
338 /* The innermost function scope. Ordinary (not explicitly declared)
339 labels, bindings to error_mark_node, and the lazily-created
340 bindings of __func__ and its friends get this scope. */
342 static GTY(()) struct c_scope
*current_function_scope
;
344 /* The C file scope. This is reset for each input translation unit. */
346 static GTY(()) struct c_scope
*file_scope
;
348 /* The outermost scope. This is used for all declarations with
349 external linkage, and only these, hence the name. */
351 static GTY(()) struct c_scope
*external_scope
;
353 /* A chain of c_scope structures awaiting reuse. */
355 static GTY((deletable
)) struct c_scope
*scope_freelist
;
357 /* A chain of c_binding structures awaiting reuse. */
359 static GTY((deletable
)) struct c_binding
*binding_freelist
;
361 /* Append VAR to LIST in scope SCOPE. */
362 #define SCOPE_LIST_APPEND(scope, list, decl) do { \
363 struct c_scope *s_ = (scope); \
365 if (s_->list##_last) \
366 TREE_CHAIN (s_->list##_last) = d_; \
369 s_->list##_last = d_; \
372 /* Concatenate FROM in scope FSCOPE onto TO in scope TSCOPE. */
373 #define SCOPE_LIST_CONCAT(tscope, to, fscope, from) do { \
374 struct c_scope *t_ = (tscope); \
375 struct c_scope *f_ = (fscope); \
377 TREE_CHAIN (t_->to##_last) = f_->from; \
380 t_->to##_last = f_->from##_last; \
383 /* True means unconditionally make a BLOCK for the next scope pushed. */
385 static bool keep_next_level_flag
;
387 /* True means the next call to push_scope will be the outermost scope
388 of a function body, so do not push a new scope, merely cease
389 expecting parameter decls. */
391 static bool next_is_function_body
;
393 /* Functions called automatically at the beginning and end of execution. */
395 static GTY(()) tree static_ctors
;
396 static GTY(()) tree static_dtors
;
398 /* Forward declarations. */
399 static tree
lookup_name_in_scope (tree
, struct c_scope
*);
400 static tree
c_make_fname_decl (tree
, int);
401 static tree
grokdeclarator (const struct c_declarator
*,
402 struct c_declspecs
*,
403 enum decl_context
, bool, tree
*);
404 static tree
grokparms (struct c_arg_info
*, bool);
405 static void layout_array_type (tree
);
407 /* States indicating how grokdeclarator() should handle declspecs marked
408 with __attribute__((deprecated)). An object declared as
409 __attribute__((deprecated)) suppresses warnings of uses of other
412 enum deprecated_states
{
417 static enum deprecated_states deprecated_state
= DEPRECATED_NORMAL
;
420 c_print_identifier (FILE *file
, tree node
, int indent
)
422 print_node (file
, "symbol", I_SYMBOL_DECL (node
), indent
+ 4);
423 print_node (file
, "tag", I_TAG_DECL (node
), indent
+ 4);
424 print_node (file
, "label", I_LABEL_DECL (node
), indent
+ 4);
425 if (C_IS_RESERVED_WORD (node
))
427 tree rid
= ridpointers
[C_RID_CODE (node
)];
428 indent_to (file
, indent
+ 4);
429 fprintf (file
, "rid " HOST_PTR_PRINTF
" \"%s\"",
430 (void *) rid
, IDENTIFIER_POINTER (rid
));
434 /* Establish a binding between NAME, an IDENTIFIER_NODE, and DECL,
435 which may be any of several kinds of DECL or TYPE or error_mark_node,
436 in the scope SCOPE. */
438 bind (tree name
, tree decl
, struct c_scope
*scope
, bool invisible
, bool nested
)
440 struct c_binding
*b
, **here
;
442 if (binding_freelist
)
444 b
= binding_freelist
;
445 binding_freelist
= b
->prev
;
448 b
= GGC_NEW (struct c_binding
);
453 b
->depth
= scope
->depth
;
454 b
->invisible
= invisible
;
460 b
->prev
= scope
->bindings
;
466 switch (TREE_CODE (decl
))
468 case LABEL_DECL
: here
= &I_LABEL_BINDING (name
); break;
471 case RECORD_TYPE
: here
= &I_TAG_BINDING (name
); break;
477 case ERROR_MARK
: here
= &I_SYMBOL_BINDING (name
); break;
483 /* Locate the appropriate place in the chain of shadowed decls
484 to insert this binding. Normally, scope == current_scope and
485 this does nothing. */
486 while (*here
&& (*here
)->depth
> scope
->depth
)
487 here
= &(*here
)->shadowed
;
493 /* Clear the binding structure B, stick it on the binding_freelist,
494 and return the former value of b->prev. This is used by pop_scope
495 and get_parm_info to iterate destructively over all the bindings
496 from a given scope. */
497 static struct c_binding
*
498 free_binding_and_advance (struct c_binding
*b
)
500 struct c_binding
*prev
= b
->prev
;
502 memset (b
, 0, sizeof (struct c_binding
));
503 b
->prev
= binding_freelist
;
504 binding_freelist
= b
;
510 /* Hook called at end of compilation to assume 1 elt
511 for a file-scope tentative array defn that wasn't complete before. */
514 c_finish_incomplete_decl (tree decl
)
516 if (TREE_CODE (decl
) == VAR_DECL
)
518 tree type
= TREE_TYPE (decl
);
519 if (type
!= error_mark_node
520 && TREE_CODE (type
) == ARRAY_TYPE
521 && ! DECL_EXTERNAL (decl
)
522 && TYPE_DOMAIN (type
) == 0)
524 warning ("%Jarray %qD assumed to have one element", decl
, decl
);
526 complete_array_type (type
, NULL_TREE
, 1);
528 layout_decl (decl
, 0);
533 /* The Objective-C front-end often needs to determine the current scope. */
536 objc_get_current_scope (void)
538 return current_scope
;
541 /* The following function is used only by Objective-C. It needs to live here
542 because it accesses the innards of c_scope. */
545 objc_mark_locals_volatile (void *enclosing_blk
)
547 struct c_scope
*scope
;
550 for (scope
= current_scope
;
551 scope
&& scope
!= enclosing_blk
;
552 scope
= scope
->outer
)
554 for (b
= scope
->bindings
; b
; b
= b
->prev
)
556 if (TREE_CODE (b
->decl
) == VAR_DECL
557 || TREE_CODE (b
->decl
) == PARM_DECL
)
559 C_DECL_REGISTER (b
->decl
) = 0;
560 DECL_REGISTER (b
->decl
) = 0;
561 TREE_THIS_VOLATILE (b
->decl
) = 1;
565 /* Do not climb up past the current function. */
566 if (scope
->function_body
)
571 /* Nonzero if we are currently in file scope. */
574 global_bindings_p (void)
576 return current_scope
== file_scope
&& !c_override_global_bindings_to_false
;
580 keep_next_level (void)
582 keep_next_level_flag
= true;
585 /* Identify this scope as currently being filled with parameters. */
588 declare_parm_level (void)
590 current_scope
->parm_flag
= true;
596 if (next_is_function_body
)
598 /* This is the transition from the parameters to the top level
599 of the function body. These are the same scope
600 (C99 6.2.1p4,6) so we do not push another scope structure.
601 next_is_function_body is set only by store_parm_decls, which
602 in turn is called when and only when we are about to
603 encounter the opening curly brace for the function body.
605 The outermost block of a function always gets a BLOCK node,
606 because the debugging output routines expect that each
607 function has at least one BLOCK. */
608 current_scope
->parm_flag
= false;
609 current_scope
->function_body
= true;
610 current_scope
->keep
= true;
611 current_scope
->outer_function
= current_function_scope
;
612 current_function_scope
= current_scope
;
614 keep_next_level_flag
= false;
615 next_is_function_body
= false;
619 struct c_scope
*scope
;
622 scope
= scope_freelist
;
623 scope_freelist
= scope
->outer
;
626 scope
= GGC_CNEW (struct c_scope
);
628 scope
->keep
= keep_next_level_flag
;
629 scope
->outer
= current_scope
;
630 scope
->depth
= current_scope
? (current_scope
->depth
+ 1) : 0;
632 /* Check for scope depth overflow. Unlikely (2^28 == 268,435,456) but
634 if (current_scope
&& scope
->depth
== 0)
637 sorry ("GCC supports only %u nested scopes\n", scope
->depth
);
640 current_scope
= scope
;
641 keep_next_level_flag
= false;
645 /* Set the TYPE_CONTEXT of all of TYPE's variants to CONTEXT. */
648 set_type_context (tree type
, tree context
)
650 for (type
= TYPE_MAIN_VARIANT (type
); type
;
651 type
= TYPE_NEXT_VARIANT (type
))
652 TYPE_CONTEXT (type
) = context
;
655 /* Exit a scope. Restore the state of the identifier-decl mappings
656 that were in effect when this scope was entered. Return a BLOCK
657 node containing all the DECLs in this scope that are of interest
658 to debug info generation. */
663 struct c_scope
*scope
= current_scope
;
664 tree block
, context
, p
;
667 bool functionbody
= scope
->function_body
;
668 bool keep
= functionbody
|| scope
->keep
|| scope
->bindings
;
670 /* If appropriate, create a BLOCK to record the decls for the life
675 block
= make_node (BLOCK
);
676 BLOCK_SUBBLOCKS (block
) = scope
->blocks
;
677 TREE_USED (block
) = 1;
679 /* In each subblock, record that this is its superior. */
680 for (p
= scope
->blocks
; p
; p
= TREE_CHAIN (p
))
681 BLOCK_SUPERCONTEXT (p
) = block
;
683 BLOCK_VARS (block
) = 0;
686 /* The TYPE_CONTEXTs for all of the tagged types belonging to this
687 scope must be set so that they point to the appropriate
688 construct, i.e. either to the current FUNCTION_DECL node, or
689 else to the BLOCK node we just constructed.
691 Note that for tagged types whose scope is just the formal
692 parameter list for some function type specification, we can't
693 properly set their TYPE_CONTEXTs here, because we don't have a
694 pointer to the appropriate FUNCTION_TYPE node readily available
695 to us. For those cases, the TYPE_CONTEXTs of the relevant tagged
696 type nodes get set in `grokdeclarator' as soon as we have created
697 the FUNCTION_TYPE node which will represent the "scope" for these
698 "parameter list local" tagged types. */
699 if (scope
->function_body
)
700 context
= current_function_decl
;
701 else if (scope
== file_scope
)
703 tree file_decl
= build_decl (TRANSLATION_UNIT_DECL
, 0, 0);
704 TREE_CHAIN (file_decl
) = all_translation_units
;
705 all_translation_units
= file_decl
;
711 /* Clear all bindings in this scope. */
712 for (b
= scope
->bindings
; b
; b
= free_binding_and_advance (b
))
715 switch (TREE_CODE (p
))
718 /* Warnings for unused labels, errors for undefined labels. */
719 if (TREE_USED (p
) && !DECL_INITIAL (p
))
721 error ("%Jlabel %qD used but not defined", p
, p
);
722 DECL_INITIAL (p
) = error_mark_node
;
724 else if (!TREE_USED (p
) && warn_unused_label
)
726 if (DECL_INITIAL (p
))
727 warning ("%Jlabel %qD defined but not used", p
, p
);
729 warning ("%Jlabel %qD declared but not defined", p
, p
);
731 /* Labels go in BLOCK_VARS. */
732 TREE_CHAIN (p
) = BLOCK_VARS (block
);
733 BLOCK_VARS (block
) = p
;
734 gcc_assert (I_LABEL_BINDING (b
->id
) == b
);
735 I_LABEL_BINDING (b
->id
) = b
->shadowed
;
741 set_type_context (p
, context
);
743 /* Types may not have tag-names, in which case the type
744 appears in the bindings list with b->id NULL. */
747 gcc_assert (I_TAG_BINDING (b
->id
) == b
);
748 I_TAG_BINDING (b
->id
) = b
->shadowed
;
753 /* Propagate TREE_ADDRESSABLE from nested functions to their
754 containing functions. */
755 if (! TREE_ASM_WRITTEN (p
)
756 && DECL_INITIAL (p
) != 0
757 && TREE_ADDRESSABLE (p
)
758 && DECL_ABSTRACT_ORIGIN (p
) != 0
759 && DECL_ABSTRACT_ORIGIN (p
) != p
)
760 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (p
)) = 1;
764 /* Warnings for unused variables. */
765 if (warn_unused_variable
767 && !DECL_IN_SYSTEM_HEADER (p
)
769 && !DECL_ARTIFICIAL (p
)
770 && (scope
!= file_scope
771 || (TREE_STATIC (p
) && !TREE_PUBLIC (p
)
772 && !TREE_THIS_VOLATILE (p
)))
773 && scope
!= external_scope
)
774 warning ("%Junused variable %qD", p
, p
);
778 error ("%Jtype of array %qD completed incompatibly with"
779 " implicit initialization", p
, p
);
786 /* All of these go in BLOCK_VARS, but only if this is the
787 binding in the home scope. */
790 TREE_CHAIN (p
) = BLOCK_VARS (block
);
791 BLOCK_VARS (block
) = p
;
793 /* If this is the file scope, and we are processing more
794 than one translation unit in this compilation, set
795 DECL_CONTEXT of each decl to the TRANSLATION_UNIT_DECL.
796 This makes same_translation_unit_p work, and causes
797 static declarations to be given disambiguating suffixes. */
798 if (scope
== file_scope
&& num_in_fnames
> 1)
800 DECL_CONTEXT (p
) = context
;
801 if (TREE_CODE (p
) == TYPE_DECL
)
802 set_type_context (TREE_TYPE (p
), context
);
806 /* Parameters go in DECL_ARGUMENTS, not BLOCK_VARS, and have
807 already been put there by store_parm_decls. Unused-
808 parameter warnings are handled by function.c.
809 error_mark_node obviously does not go in BLOCK_VARS and
810 does not get unused-variable warnings. */
813 /* It is possible for a decl not to have a name. We get
814 here with b->id NULL in this case. */
817 gcc_assert (I_SYMBOL_BINDING (b
->id
) == b
);
818 I_SYMBOL_BINDING (b
->id
) = b
->shadowed
;
819 if (b
->shadowed
&& b
->shadowed
->type
)
820 TREE_TYPE (b
->shadowed
->decl
) = b
->shadowed
->type
;
830 /* Dispose of the block that we just made inside some higher level. */
831 if ((scope
->function_body
|| scope
== file_scope
) && context
)
833 DECL_INITIAL (context
) = block
;
834 BLOCK_SUPERCONTEXT (block
) = context
;
836 else if (scope
->outer
)
839 SCOPE_LIST_APPEND (scope
->outer
, blocks
, block
);
840 /* If we did not make a block for the scope just exited, any
841 blocks made for inner scopes must be carried forward so they
842 will later become subblocks of something else. */
843 else if (scope
->blocks
)
844 SCOPE_LIST_CONCAT (scope
->outer
, blocks
, scope
, blocks
);
847 /* Pop the current scope, and free the structure for reuse. */
848 current_scope
= scope
->outer
;
849 if (scope
->function_body
)
850 current_function_scope
= scope
->outer_function
;
852 memset (scope
, 0, sizeof (struct c_scope
));
853 scope
->outer
= scope_freelist
;
854 scope_freelist
= scope
;
860 push_file_scope (void)
868 file_scope
= current_scope
;
870 start_fname_decls ();
872 for (decl
= visible_builtins
; decl
; decl
= TREE_CHAIN (decl
))
873 bind (DECL_NAME (decl
), decl
, file_scope
,
874 /*invisible=*/false, /*nested=*/true);
878 pop_file_scope (void)
880 /* In case there were missing closebraces, get us back to the global
882 while (current_scope
!= file_scope
)
885 /* __FUNCTION__ is defined at file scope (""). This
886 call may not be necessary as my tests indicate it
887 still works without it. */
888 finish_fname_decls ();
890 /* This is the point to write out a PCH if we're doing that.
891 In that case we do not want to do anything else. */
894 c_common_write_pch ();
898 /* Pop off the file scope and close this translation unit. */
901 cgraph_finalize_compilation_unit ();
904 /* Insert BLOCK at the end of the list of subblocks of the current
905 scope. This is used when a BIND_EXPR is expanded, to handle the
906 BLOCK node inside the BIND_EXPR. */
909 insert_block (tree block
)
911 TREE_USED (block
) = 1;
912 SCOPE_LIST_APPEND (current_scope
, blocks
, block
);
915 /* Push a definition or a declaration of struct, union or enum tag "name".
916 "type" should be the type node.
917 We assume that the tag "name" is not already defined.
919 Note that the definition may really be just a forward reference.
920 In that case, the TYPE_SIZE will be zero. */
923 pushtag (tree name
, tree type
)
925 /* Record the identifier as the type's name if it has none. */
926 if (name
&& !TYPE_NAME (type
))
927 TYPE_NAME (type
) = name
;
928 bind (name
, type
, current_scope
, /*invisible=*/false, /*nested=*/false);
930 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
931 tagged type we just added to the current scope. This fake
932 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
933 to output a representation of a tagged type, and it also gives
934 us a convenient place to record the "scope start" address for the
937 TYPE_STUB_DECL (type
) = pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, type
));
939 /* An approximation for now, so we can tell this is a function-scope tag.
940 This will be updated in pop_scope. */
941 TYPE_CONTEXT (type
) = DECL_CONTEXT (TYPE_STUB_DECL (type
));
944 /* Subroutine of compare_decls. Allow harmless mismatches in return
945 and argument types provided that the type modes match. This function
946 return a unified type given a suitable match, and 0 otherwise. */
949 match_builtin_function_types (tree newtype
, tree oldtype
)
951 tree newrettype
, oldrettype
;
952 tree newargs
, oldargs
;
953 tree trytype
, tryargs
;
955 /* Accept the return type of the new declaration if same modes. */
956 oldrettype
= TREE_TYPE (oldtype
);
957 newrettype
= TREE_TYPE (newtype
);
959 if (TYPE_MODE (oldrettype
) != TYPE_MODE (newrettype
))
962 oldargs
= TYPE_ARG_TYPES (oldtype
);
963 newargs
= TYPE_ARG_TYPES (newtype
);
966 while (oldargs
|| newargs
)
970 || ! TREE_VALUE (oldargs
)
971 || ! TREE_VALUE (newargs
)
972 || TYPE_MODE (TREE_VALUE (oldargs
))
973 != TYPE_MODE (TREE_VALUE (newargs
)))
976 oldargs
= TREE_CHAIN (oldargs
);
977 newargs
= TREE_CHAIN (newargs
);
980 trytype
= build_function_type (newrettype
, tryargs
);
981 return build_type_attribute_variant (trytype
, TYPE_ATTRIBUTES (oldtype
));
984 /* Subroutine of diagnose_mismatched_decls. Check for function type
985 mismatch involving an empty arglist vs a nonempty one and give clearer
988 diagnose_arglist_conflict (tree newdecl
, tree olddecl
,
989 tree newtype
, tree oldtype
)
993 if (TREE_CODE (olddecl
) != FUNCTION_DECL
994 || !comptypes (TREE_TYPE (oldtype
), TREE_TYPE (newtype
))
995 || !((TYPE_ARG_TYPES (oldtype
) == 0 && DECL_INITIAL (olddecl
) == 0)
997 (TYPE_ARG_TYPES (newtype
) == 0 && DECL_INITIAL (newdecl
) == 0)))
1000 t
= TYPE_ARG_TYPES (oldtype
);
1002 t
= TYPE_ARG_TYPES (newtype
);
1003 for (; t
; t
= TREE_CHAIN (t
))
1005 tree type
= TREE_VALUE (t
);
1007 if (TREE_CHAIN (t
) == 0
1008 && TYPE_MAIN_VARIANT (type
) != void_type_node
)
1010 inform ("a parameter list with an ellipsis can't match "
1011 "an empty parameter name list declaration");
1015 if (c_type_promotes_to (type
) != type
)
1017 inform ("an argument type that has a default promotion can't match "
1018 "an empty parameter name list declaration");
1024 /* Another subroutine of diagnose_mismatched_decls. OLDDECL is an
1025 old-style function definition, NEWDECL is a prototype declaration.
1026 Diagnose inconsistencies in the argument list. Returns TRUE if
1027 the prototype is compatible, FALSE if not. */
1029 validate_proto_after_old_defn (tree newdecl
, tree newtype
, tree oldtype
)
1031 tree newargs
, oldargs
;
1034 /* ??? Elsewhere TYPE_MAIN_VARIANT is not used in this context. */
1035 #define END_OF_ARGLIST(t) (TYPE_MAIN_VARIANT (t) == void_type_node)
1037 oldargs
= TYPE_ACTUAL_ARG_TYPES (oldtype
);
1038 newargs
= TYPE_ARG_TYPES (newtype
);
1043 tree oldargtype
= TREE_VALUE (oldargs
);
1044 tree newargtype
= TREE_VALUE (newargs
);
1046 if (END_OF_ARGLIST (oldargtype
) && END_OF_ARGLIST (newargtype
))
1049 /* Reaching the end of just one list means the two decls don't
1050 agree on the number of arguments. */
1051 if (END_OF_ARGLIST (oldargtype
))
1053 error ("%Jprototype for %qD declares more arguments "
1054 "than previous old-style definition", newdecl
, newdecl
);
1057 else if (END_OF_ARGLIST (newargtype
))
1059 error ("%Jprototype for %qD declares fewer arguments "
1060 "than previous old-style definition", newdecl
, newdecl
);
1064 /* Type for passing arg must be consistent with that declared
1066 else if (! comptypes (oldargtype
, newargtype
))
1068 error ("%Jprototype for %qD declares arg %d with incompatible type",
1069 newdecl
, newdecl
, i
);
1073 oldargs
= TREE_CHAIN (oldargs
);
1074 newargs
= TREE_CHAIN (newargs
);
1078 /* If we get here, no errors were found, but do issue a warning
1079 for this poor-style construct. */
1080 warning ("%Jprototype for %qD follows non-prototype definition",
1083 #undef END_OF_ARGLIST
1086 /* Subroutine of diagnose_mismatched_decls. Report the location of DECL,
1087 first in a pair of mismatched declarations, using the diagnostic
1090 locate_old_decl (tree decl
, void (*diag
)(const char *, ...))
1092 if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_BUILT_IN (decl
))
1094 else if (DECL_INITIAL (decl
))
1095 diag (N_("%Jprevious definition of %qD was here"), decl
, decl
);
1096 else if (C_DECL_IMPLICIT (decl
))
1097 diag (N_("%Jprevious implicit declaration of %qD was here"), decl
, decl
);
1099 diag (N_("%Jprevious declaration of %qD was here"), decl
, decl
);
1102 /* Subroutine of duplicate_decls. Compare NEWDECL to OLDDECL.
1103 Returns true if the caller should proceed to merge the two, false
1104 if OLDDECL should simply be discarded. As a side effect, issues
1105 all necessary diagnostics for invalid or poor-style combinations.
1106 If it returns true, writes the types of NEWDECL and OLDDECL to
1107 *NEWTYPEP and *OLDTYPEP - these may have been adjusted from
1108 TREE_TYPE (NEWDECL, OLDDECL) respectively. */
1111 diagnose_mismatched_decls (tree newdecl
, tree olddecl
,
1112 tree
*newtypep
, tree
*oldtypep
)
1114 tree newtype
, oldtype
;
1115 bool pedwarned
= false;
1116 bool warned
= false;
1118 /* If we have error_mark_node for either decl or type, just discard
1119 the previous decl - we're in an error cascade already. */
1120 if (olddecl
== error_mark_node
|| newdecl
== error_mark_node
)
1122 *oldtypep
= oldtype
= TREE_TYPE (olddecl
);
1123 *newtypep
= newtype
= TREE_TYPE (newdecl
);
1124 if (oldtype
== error_mark_node
|| newtype
== error_mark_node
)
1127 /* Two different categories of symbol altogether. This is an error
1128 unless OLDDECL is a builtin. OLDDECL will be discarded in any case. */
1129 if (TREE_CODE (olddecl
) != TREE_CODE (newdecl
))
1131 if (!(TREE_CODE (olddecl
) == FUNCTION_DECL
1132 && DECL_BUILT_IN (olddecl
)
1133 && !C_DECL_DECLARED_BUILTIN (olddecl
)))
1135 error ("%J%qD redeclared as different kind of symbol",
1137 locate_old_decl (olddecl
, error
);
1139 else if (TREE_PUBLIC (newdecl
))
1140 warning ("%Jbuilt-in function %qD declared as non-function",
1142 else if (warn_shadow
)
1143 warning ("%Jdeclaration of %qD shadows a built-in function",
1148 /* Enumerators have no linkage, so may only be declared once in a
1150 if (TREE_CODE (olddecl
) == CONST_DECL
)
1152 error ("%Jredeclaration of enumerator %qD", newdecl
, newdecl
);
1153 locate_old_decl (olddecl
, error
);
1157 if (!comptypes (oldtype
, newtype
))
1159 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1160 && DECL_BUILT_IN (olddecl
) && !C_DECL_DECLARED_BUILTIN (olddecl
))
1162 /* Accept harmless mismatch in function types.
1163 This is for the ffs and fprintf builtins. */
1164 tree trytype
= match_builtin_function_types (newtype
, oldtype
);
1166 if (trytype
&& comptypes (newtype
, trytype
))
1167 *oldtypep
= oldtype
= trytype
;
1170 /* If types don't match for a built-in, throw away the
1171 built-in. No point in calling locate_old_decl here, it
1172 won't print anything. */
1173 warning ("%Jconflicting types for built-in function %qD",
1178 else if (TREE_CODE (olddecl
) == FUNCTION_DECL
1179 && DECL_IS_BUILTIN (olddecl
))
1181 /* A conflicting function declaration for a predeclared
1182 function that isn't actually built in. Objective C uses
1183 these. The new declaration silently overrides everything
1184 but the volatility (i.e. noreturn) indication. See also
1185 below. FIXME: Make Objective C use normal builtins. */
1186 TREE_THIS_VOLATILE (newdecl
) |= TREE_THIS_VOLATILE (olddecl
);
1189 /* Permit void foo (...) to match int foo (...) if the latter is
1190 the definition and implicit int was used. See
1191 c-torture/compile/920625-2.c. */
1192 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
&& DECL_INITIAL (newdecl
)
1193 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype
)) == void_type_node
1194 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype
)) == integer_type_node
1195 && C_FUNCTION_IMPLICIT_INT (newdecl
))
1197 pedwarn ("%Jconflicting types for %qD", newdecl
, newdecl
);
1198 /* Make sure we keep void as the return type. */
1199 TREE_TYPE (newdecl
) = *newtypep
= newtype
= oldtype
;
1200 C_FUNCTION_IMPLICIT_INT (newdecl
) = 0;
1205 if (TYPE_QUALS (newtype
) != TYPE_QUALS (oldtype
))
1206 error ("%J conflicting type qualifiers for %qD", newdecl
, newdecl
);
1208 error ("%Jconflicting types for %qD", newdecl
, newdecl
);
1209 diagnose_arglist_conflict (newdecl
, olddecl
, newtype
, oldtype
);
1210 locate_old_decl (olddecl
, error
);
1215 /* Redeclaration of a type is a constraint violation (6.7.2.3p1),
1216 but silently ignore the redeclaration if either is in a system
1217 header. (Conflicting redeclarations were handled above.) */
1218 if (TREE_CODE (newdecl
) == TYPE_DECL
)
1220 if (DECL_IN_SYSTEM_HEADER (newdecl
) || DECL_IN_SYSTEM_HEADER (olddecl
))
1221 return true; /* Allow OLDDECL to continue in use. */
1223 error ("%Jredefinition of typedef %qD", newdecl
, newdecl
);
1224 locate_old_decl (olddecl
, error
);
1228 /* Function declarations can either be 'static' or 'extern' (no
1229 qualifier is equivalent to 'extern' - C99 6.2.2p5) and therefore
1230 can never conflict with each other on account of linkage (6.2.2p4).
1231 Multiple definitions are not allowed (6.9p3,5) but GCC permits
1232 two definitions if one is 'extern inline' and one is not. The non-
1233 extern-inline definition supersedes the extern-inline definition. */
1234 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1236 /* If you declare a built-in function name as static, or
1237 define the built-in with an old-style definition (so we
1238 can't validate the argument list) the built-in definition is
1239 overridden, but optionally warn this was a bad choice of name. */
1240 if (DECL_BUILT_IN (olddecl
)
1241 && !C_DECL_DECLARED_BUILTIN (olddecl
)
1242 && (!TREE_PUBLIC (newdecl
)
1243 || (DECL_INITIAL (newdecl
)
1244 && !TYPE_ARG_TYPES (TREE_TYPE (newdecl
)))))
1247 warning ("%Jdeclaration of %qD shadows a built-in function",
1249 /* Discard the old built-in function. */
1253 if (DECL_INITIAL (newdecl
))
1255 if (DECL_INITIAL (olddecl
)
1256 && !(DECL_DECLARED_INLINE_P (olddecl
)
1257 && DECL_EXTERNAL (olddecl
)
1258 && !(DECL_DECLARED_INLINE_P (newdecl
)
1259 && DECL_EXTERNAL (newdecl
)
1260 && same_translation_unit_p (olddecl
, newdecl
))))
1262 error ("%Jredefinition of %qD", newdecl
, newdecl
);
1263 locate_old_decl (olddecl
, error
);
1267 /* If we have a prototype after an old-style function definition,
1268 the argument types must be checked specially. */
1269 else if (DECL_INITIAL (olddecl
)
1270 && !TYPE_ARG_TYPES (oldtype
) && TYPE_ARG_TYPES (newtype
)
1271 && TYPE_ACTUAL_ARG_TYPES (oldtype
)
1272 && !validate_proto_after_old_defn (newdecl
, newtype
, oldtype
))
1274 locate_old_decl (olddecl
, error
);
1277 /* A non-static declaration (even an "extern") followed by a
1278 static declaration is undefined behavior per C99 6.2.2p3-5,7.
1279 The same is true for a static forward declaration at block
1280 scope followed by a non-static declaration/definition at file
1281 scope. Static followed by non-static at the same scope is
1282 not undefined behavior, and is the most convenient way to get
1283 some effects (see e.g. what unwind-dw2-fde-glibc.c does to
1284 the definition of _Unwind_Find_FDE in unwind-dw2-fde.c), but
1285 we do diagnose it if -Wtraditional. */
1286 if (TREE_PUBLIC (olddecl
) && !TREE_PUBLIC (newdecl
))
1288 /* Two exceptions to the rule. If olddecl is an extern
1289 inline, or a predeclared function that isn't actually
1290 built in, newdecl silently overrides olddecl. The latter
1291 occur only in Objective C; see also above. (FIXME: Make
1292 Objective C use normal builtins.) */
1293 if (!DECL_IS_BUILTIN (olddecl
)
1294 && !(DECL_EXTERNAL (olddecl
)
1295 && DECL_DECLARED_INLINE_P (olddecl
)))
1297 error ("%Jstatic declaration of %qD follows "
1298 "non-static declaration", newdecl
, newdecl
);
1299 locate_old_decl (olddecl
, error
);
1303 else if (TREE_PUBLIC (newdecl
) && !TREE_PUBLIC (olddecl
))
1305 if (DECL_CONTEXT (olddecl
))
1307 error ("%Jnon-static declaration of %qD follows "
1308 "static declaration", newdecl
, newdecl
);
1309 locate_old_decl (olddecl
, error
);
1312 else if (warn_traditional
)
1314 warning ("%Jnon-static declaration of %qD follows "
1315 "static declaration", newdecl
, newdecl
);
1320 else if (TREE_CODE (newdecl
) == VAR_DECL
)
1322 /* Only variables can be thread-local, and all declarations must
1323 agree on this property. */
1324 if (DECL_THREAD_LOCAL (newdecl
) != DECL_THREAD_LOCAL (olddecl
))
1326 if (DECL_THREAD_LOCAL (newdecl
))
1327 error ("%Jthread-local declaration of %qD follows "
1328 "non-thread-local declaration", newdecl
, newdecl
);
1330 error ("%Jnon-thread-local declaration of %qD follows "
1331 "thread-local declaration", newdecl
, newdecl
);
1333 locate_old_decl (olddecl
, error
);
1337 /* Multiple initialized definitions are not allowed (6.9p3,5). */
1338 if (DECL_INITIAL (newdecl
) && DECL_INITIAL (olddecl
))
1340 error ("%Jredefinition of %qD", newdecl
, newdecl
);
1341 locate_old_decl (olddecl
, error
);
1345 /* Objects declared at file scope: if the first declaration had
1346 external linkage (even if it was an external reference) the
1347 second must have external linkage as well, or the behavior is
1348 undefined. If the first declaration had internal linkage, then
1349 the second must too, or else be an external reference (in which
1350 case the composite declaration still has internal linkage).
1351 As for function declarations, we warn about the static-then-
1352 extern case only for -Wtraditional. See generally 6.2.2p3-5,7. */
1353 if (DECL_FILE_SCOPE_P (newdecl
)
1354 && TREE_PUBLIC (newdecl
) != TREE_PUBLIC (olddecl
))
1356 if (DECL_EXTERNAL (newdecl
))
1358 if (!DECL_FILE_SCOPE_P (olddecl
))
1360 error ("%Jextern declaration of %qD follows "
1361 "declaration with no linkage", newdecl
, newdecl
);
1362 locate_old_decl (olddecl
, error
);
1365 else if (warn_traditional
)
1367 warning ("%Jnon-static declaration of %qD follows "
1368 "static declaration", newdecl
, newdecl
);
1374 if (TREE_PUBLIC (newdecl
))
1375 error ("%Jnon-static declaration of %qD follows "
1376 "static declaration", newdecl
, newdecl
);
1378 error ("%Jstatic declaration of %qD follows "
1379 "non-static declaration", newdecl
, newdecl
);
1381 locate_old_decl (olddecl
, error
);
1385 /* Two objects with the same name declared at the same block
1386 scope must both be external references (6.7p3). */
1387 else if (!DECL_FILE_SCOPE_P (newdecl
))
1389 if (DECL_EXTERNAL (newdecl
))
1391 /* Extern with initializer at block scope, which will
1392 already have received an error. */
1394 else if (DECL_EXTERNAL (olddecl
))
1396 error ("%Jdeclaration of %qD with no linkage follows "
1397 "extern declaration", newdecl
, newdecl
);
1398 locate_old_decl (olddecl
, error
);
1402 error ("%Jredeclaration of %qD with no linkage",
1404 locate_old_decl (olddecl
, error
);
1412 /* All decls must agree on a visibility. */
1413 if (DECL_VISIBILITY_SPECIFIED (newdecl
) && DECL_VISIBILITY_SPECIFIED (olddecl
)
1414 && DECL_VISIBILITY (newdecl
) != DECL_VISIBILITY (olddecl
))
1416 warning ("%Jredeclaration of %qD with different visibility "
1417 "(old visibility preserved)", newdecl
, newdecl
);
1421 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1423 /* Diagnose inline __attribute__ ((noinline)) which is silly. */
1424 if (DECL_DECLARED_INLINE_P (newdecl
)
1425 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl
)))
1427 warning ("%Jinline declaration of %qD follows "
1428 "declaration with attribute noinline", newdecl
, newdecl
);
1431 else if (DECL_DECLARED_INLINE_P (olddecl
)
1432 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl
)))
1434 warning ("%Jdeclaration of %qD with attribute noinline follows "
1435 "inline declaration ", newdecl
, newdecl
);
1439 /* Inline declaration after use or definition.
1440 ??? Should we still warn about this now we have unit-at-a-time
1441 mode and can get it right?
1442 Definitely don't complain if the decls are in different translation
1444 if (DECL_DECLARED_INLINE_P (newdecl
) && !DECL_DECLARED_INLINE_P (olddecl
)
1445 && same_translation_unit_p (olddecl
, newdecl
))
1447 if (TREE_USED (olddecl
))
1449 warning ("%J%qD declared inline after being called",
1453 else if (DECL_INITIAL (olddecl
))
1455 warning ("%J%qD declared inline after its definition",
1461 else /* PARM_DECL, VAR_DECL */
1463 /* Redeclaration of a parameter is a constraint violation (this is
1464 not explicitly stated, but follows from C99 6.7p3 [no more than
1465 one declaration of the same identifier with no linkage in the
1466 same scope, except type tags] and 6.2.2p6 [parameters have no
1467 linkage]). We must check for a forward parameter declaration,
1468 indicated by TREE_ASM_WRITTEN on the old declaration - this is
1469 an extension, the mandatory diagnostic for which is handled by
1470 mark_forward_parm_decls. */
1472 if (TREE_CODE (newdecl
) == PARM_DECL
1473 && (!TREE_ASM_WRITTEN (olddecl
) || TREE_ASM_WRITTEN (newdecl
)))
1475 error ("%Jredefinition of parameter %qD", newdecl
, newdecl
);
1476 locate_old_decl (olddecl
, error
);
1481 /* Optional warning for completely redundant decls. */
1482 if (!warned
&& !pedwarned
1483 && warn_redundant_decls
1484 /* Don't warn about a function declaration followed by a
1486 && !(TREE_CODE (newdecl
) == FUNCTION_DECL
1487 && DECL_INITIAL (newdecl
) && !DECL_INITIAL (olddecl
))
1488 /* Don't warn about redundant redeclarations of builtins. */
1489 && !(TREE_CODE (newdecl
) == FUNCTION_DECL
1490 && !DECL_BUILT_IN (newdecl
)
1491 && DECL_BUILT_IN (olddecl
)
1492 && !C_DECL_DECLARED_BUILTIN (olddecl
))
1493 /* Don't warn about an extern followed by a definition. */
1494 && !(DECL_EXTERNAL (olddecl
) && !DECL_EXTERNAL (newdecl
))
1495 /* Don't warn about forward parameter decls. */
1496 && !(TREE_CODE (newdecl
) == PARM_DECL
1497 && TREE_ASM_WRITTEN (olddecl
) && !TREE_ASM_WRITTEN (newdecl
)))
1499 warning ("%Jredundant redeclaration of %qD", newdecl
, newdecl
);
1503 /* Report location of previous decl/defn in a consistent manner. */
1504 if (warned
|| pedwarned
)
1505 locate_old_decl (olddecl
, pedwarned
? pedwarn
: warning
);
1510 /* Subroutine of duplicate_decls. NEWDECL has been found to be
1511 consistent with OLDDECL, but carries new information. Merge the
1512 new information into OLDDECL. This function issues no
1516 merge_decls (tree newdecl
, tree olddecl
, tree newtype
, tree oldtype
)
1518 int new_is_definition
= (TREE_CODE (newdecl
) == FUNCTION_DECL
1519 && DECL_INITIAL (newdecl
) != 0);
1521 /* For real parm decl following a forward decl, rechain the old decl
1522 in its new location and clear TREE_ASM_WRITTEN (it's not a
1523 forward decl anymore). */
1524 if (TREE_CODE (newdecl
) == PARM_DECL
1525 && TREE_ASM_WRITTEN (olddecl
) && ! TREE_ASM_WRITTEN (newdecl
))
1527 struct c_binding
*b
, **here
;
1529 for (here
= ¤t_scope
->bindings
; *here
; here
= &(*here
)->prev
)
1530 if ((*here
)->decl
== olddecl
)
1537 b
->prev
= current_scope
->bindings
;
1538 current_scope
->bindings
= b
;
1540 TREE_ASM_WRITTEN (olddecl
) = 0;
1543 DECL_ATTRIBUTES (newdecl
)
1544 = targetm
.merge_decl_attributes (olddecl
, newdecl
);
1546 /* Merge the data types specified in the two decls. */
1548 = TREE_TYPE (olddecl
)
1549 = composite_type (newtype
, oldtype
);
1551 /* Lay the type out, unless already done. */
1552 if (oldtype
!= TREE_TYPE (newdecl
))
1554 if (TREE_TYPE (newdecl
) != error_mark_node
)
1555 layout_type (TREE_TYPE (newdecl
));
1556 if (TREE_CODE (newdecl
) != FUNCTION_DECL
1557 && TREE_CODE (newdecl
) != TYPE_DECL
1558 && TREE_CODE (newdecl
) != CONST_DECL
)
1559 layout_decl (newdecl
, 0);
1563 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1564 DECL_SIZE (newdecl
) = DECL_SIZE (olddecl
);
1565 DECL_SIZE_UNIT (newdecl
) = DECL_SIZE_UNIT (olddecl
);
1566 DECL_MODE (newdecl
) = DECL_MODE (olddecl
);
1567 if (TREE_CODE (olddecl
) != FUNCTION_DECL
)
1568 if (DECL_ALIGN (olddecl
) > DECL_ALIGN (newdecl
))
1570 DECL_ALIGN (newdecl
) = DECL_ALIGN (olddecl
);
1571 DECL_USER_ALIGN (newdecl
) |= DECL_ALIGN (olddecl
);
1575 /* Keep the old rtl since we can safely use it. */
1576 COPY_DECL_RTL (olddecl
, newdecl
);
1578 /* Merge the type qualifiers. */
1579 if (TREE_READONLY (newdecl
))
1580 TREE_READONLY (olddecl
) = 1;
1582 if (TREE_THIS_VOLATILE (newdecl
))
1584 TREE_THIS_VOLATILE (olddecl
) = 1;
1585 if (TREE_CODE (newdecl
) == VAR_DECL
)
1586 make_var_volatile (newdecl
);
1589 /* Keep source location of definition rather than declaration. */
1590 if (DECL_INITIAL (newdecl
) == 0 && DECL_INITIAL (olddecl
) != 0)
1591 DECL_SOURCE_LOCATION (newdecl
) = DECL_SOURCE_LOCATION (olddecl
);
1593 /* Merge the unused-warning information. */
1594 if (DECL_IN_SYSTEM_HEADER (olddecl
))
1595 DECL_IN_SYSTEM_HEADER (newdecl
) = 1;
1596 else if (DECL_IN_SYSTEM_HEADER (newdecl
))
1597 DECL_IN_SYSTEM_HEADER (olddecl
) = 1;
1599 /* Merge the initialization information. */
1600 if (DECL_INITIAL (newdecl
) == 0)
1601 DECL_INITIAL (newdecl
) = DECL_INITIAL (olddecl
);
1603 /* Merge the section attribute.
1604 We want to issue an error if the sections conflict but that must be
1605 done later in decl_attributes since we are called before attributes
1607 if (DECL_SECTION_NAME (newdecl
) == NULL_TREE
)
1608 DECL_SECTION_NAME (newdecl
) = DECL_SECTION_NAME (olddecl
);
1610 /* Copy the assembler name.
1611 Currently, it can only be defined in the prototype. */
1612 COPY_DECL_ASSEMBLER_NAME (olddecl
, newdecl
);
1614 /* Use visibility of whichever declaration had it specified */
1615 if (DECL_VISIBILITY_SPECIFIED (olddecl
))
1617 DECL_VISIBILITY (newdecl
) = DECL_VISIBILITY (olddecl
);
1618 DECL_VISIBILITY_SPECIFIED (newdecl
) = 1;
1621 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1623 DECL_STATIC_CONSTRUCTOR(newdecl
) |= DECL_STATIC_CONSTRUCTOR(olddecl
);
1624 DECL_STATIC_DESTRUCTOR (newdecl
) |= DECL_STATIC_DESTRUCTOR (olddecl
);
1625 DECL_NO_LIMIT_STACK (newdecl
) |= DECL_NO_LIMIT_STACK (olddecl
);
1626 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl
)
1627 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl
);
1628 TREE_THIS_VOLATILE (newdecl
) |= TREE_THIS_VOLATILE (olddecl
);
1629 TREE_READONLY (newdecl
) |= TREE_READONLY (olddecl
);
1630 DECL_IS_MALLOC (newdecl
) |= DECL_IS_MALLOC (olddecl
);
1631 DECL_IS_PURE (newdecl
) |= DECL_IS_PURE (olddecl
);
1634 /* Merge the storage class information. */
1635 merge_weak (newdecl
, olddecl
);
1637 /* For functions, static overrides non-static. */
1638 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1640 TREE_PUBLIC (newdecl
) &= TREE_PUBLIC (olddecl
);
1641 /* This is since we don't automatically
1642 copy the attributes of NEWDECL into OLDDECL. */
1643 TREE_PUBLIC (olddecl
) = TREE_PUBLIC (newdecl
);
1644 /* If this clears `static', clear it in the identifier too. */
1645 if (! TREE_PUBLIC (olddecl
))
1646 TREE_PUBLIC (DECL_NAME (olddecl
)) = 0;
1648 if (DECL_EXTERNAL (newdecl
))
1650 TREE_STATIC (newdecl
) = TREE_STATIC (olddecl
);
1651 DECL_EXTERNAL (newdecl
) = DECL_EXTERNAL (olddecl
);
1653 /* An extern decl does not override previous storage class. */
1654 TREE_PUBLIC (newdecl
) = TREE_PUBLIC (olddecl
);
1655 if (! DECL_EXTERNAL (newdecl
))
1657 DECL_CONTEXT (newdecl
) = DECL_CONTEXT (olddecl
);
1658 DECL_COMMON (newdecl
) = DECL_COMMON (olddecl
);
1663 TREE_STATIC (olddecl
) = TREE_STATIC (newdecl
);
1664 TREE_PUBLIC (olddecl
) = TREE_PUBLIC (newdecl
);
1667 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1669 /* If we're redefining a function previously defined as extern
1670 inline, make sure we emit debug info for the inline before we
1671 throw it away, in case it was inlined into a function that hasn't
1672 been written out yet. */
1673 if (new_is_definition
&& DECL_INITIAL (olddecl
))
1675 if (TREE_USED (olddecl
)
1676 /* In unit-at-a-time mode we never inline re-defined extern
1677 inline functions. */
1678 && !flag_unit_at_a_time
1679 && cgraph_function_possibly_inlined_p (olddecl
))
1680 (*debug_hooks
->outlining_inline_function
) (olddecl
);
1682 /* The new defn must not be inline. */
1683 DECL_INLINE (newdecl
) = 0;
1684 DECL_UNINLINABLE (newdecl
) = 1;
1688 /* If either decl says `inline', this fn is inline,
1689 unless its definition was passed already. */
1690 if (DECL_DECLARED_INLINE_P (newdecl
)
1691 || DECL_DECLARED_INLINE_P (olddecl
))
1692 DECL_DECLARED_INLINE_P (newdecl
) = 1;
1694 DECL_UNINLINABLE (newdecl
) = DECL_UNINLINABLE (olddecl
)
1695 = (DECL_UNINLINABLE (newdecl
) || DECL_UNINLINABLE (olddecl
));
1698 if (DECL_BUILT_IN (olddecl
))
1700 /* If redeclaring a builtin function, it stays built in.
1701 But it gets tagged as having been declared. */
1702 DECL_BUILT_IN_CLASS (newdecl
) = DECL_BUILT_IN_CLASS (olddecl
);
1703 DECL_FUNCTION_CODE (newdecl
) = DECL_FUNCTION_CODE (olddecl
);
1704 C_DECL_DECLARED_BUILTIN (newdecl
) = 1;
1707 /* Also preserve various other info from the definition. */
1708 if (! new_is_definition
)
1710 DECL_RESULT (newdecl
) = DECL_RESULT (olddecl
);
1711 DECL_INITIAL (newdecl
) = DECL_INITIAL (olddecl
);
1712 DECL_STRUCT_FUNCTION (newdecl
) = DECL_STRUCT_FUNCTION (olddecl
);
1713 DECL_SAVED_TREE (newdecl
) = DECL_SAVED_TREE (olddecl
);
1714 DECL_ARGUMENTS (newdecl
) = DECL_ARGUMENTS (olddecl
);
1716 /* Set DECL_INLINE on the declaration if we've got a body
1717 from which to instantiate. */
1718 if (DECL_INLINE (olddecl
) && ! DECL_UNINLINABLE (newdecl
))
1720 DECL_INLINE (newdecl
) = 1;
1721 DECL_ABSTRACT_ORIGIN (newdecl
)
1722 = DECL_ABSTRACT_ORIGIN (olddecl
);
1727 /* If a previous declaration said inline, mark the
1728 definition as inlinable. */
1729 if (DECL_DECLARED_INLINE_P (newdecl
)
1730 && ! DECL_UNINLINABLE (newdecl
))
1731 DECL_INLINE (newdecl
) = 1;
1735 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
1736 But preserve OLDDECL's DECL_UID and DECL_CONTEXT. */
1738 unsigned olddecl_uid
= DECL_UID (olddecl
);
1739 tree olddecl_context
= DECL_CONTEXT (olddecl
);
1741 memcpy ((char *) olddecl
+ sizeof (struct tree_common
),
1742 (char *) newdecl
+ sizeof (struct tree_common
),
1743 sizeof (struct tree_decl
) - sizeof (struct tree_common
));
1744 DECL_UID (olddecl
) = olddecl_uid
;
1745 DECL_CONTEXT (olddecl
) = olddecl_context
;
1748 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
1749 so that encode_section_info has a chance to look at the new decl
1750 flags and attributes. */
1751 if (DECL_RTL_SET_P (olddecl
)
1752 && (TREE_CODE (olddecl
) == FUNCTION_DECL
1753 || (TREE_CODE (olddecl
) == VAR_DECL
1754 && TREE_STATIC (olddecl
))))
1755 make_decl_rtl (olddecl
);
1758 /* Handle when a new declaration NEWDECL has the same name as an old
1759 one OLDDECL in the same binding contour. Prints an error message
1762 If safely possible, alter OLDDECL to look like NEWDECL, and return
1763 true. Otherwise, return false. */
1766 duplicate_decls (tree newdecl
, tree olddecl
)
1768 tree newtype
= NULL
, oldtype
= NULL
;
1770 if (!diagnose_mismatched_decls (newdecl
, olddecl
, &newtype
, &oldtype
))
1773 merge_decls (newdecl
, olddecl
, newtype
, oldtype
);
1778 /* Check whether decl-node NEW_DECL shadows an existing declaration. */
1780 warn_if_shadowing (tree new_decl
)
1782 struct c_binding
*b
;
1784 /* Shadow warnings wanted? */
1786 /* No shadow warnings for internally generated vars. */
1787 || DECL_IS_BUILTIN (new_decl
)
1788 /* No shadow warnings for vars made for inlining. */
1789 || DECL_FROM_INLINE (new_decl
)
1790 /* Don't warn about the parm names in function declarator
1791 within a function declarator. It would be nice to avoid
1792 warning in any function declarator in a declaration, as
1793 opposed to a definition, but there is no way to tell
1794 it's not a definition at this point. */
1795 || (TREE_CODE (new_decl
) == PARM_DECL
&& current_scope
->outer
->parm_flag
))
1798 /* Is anything being shadowed? Invisible decls do not count. */
1799 for (b
= I_SYMBOL_BINDING (DECL_NAME (new_decl
)); b
; b
= b
->shadowed
)
1800 if (b
->decl
&& b
->decl
!= new_decl
&& !b
->invisible
)
1802 tree old_decl
= b
->decl
;
1804 if (TREE_CODE (old_decl
) == PARM_DECL
)
1805 warning ("%Jdeclaration of %qD shadows a parameter",
1806 new_decl
, new_decl
);
1807 else if (DECL_FILE_SCOPE_P (old_decl
))
1808 warning ("%Jdeclaration of %qD shadows a global declaration",
1809 new_decl
, new_decl
);
1810 else if (TREE_CODE (old_decl
) == FUNCTION_DECL
1811 && DECL_BUILT_IN (old_decl
))
1812 warning ("%Jdeclaration of %qD shadows a built-in function",
1813 new_decl
, new_decl
);
1815 warning ("%Jdeclaration of %qD shadows a previous local",
1816 new_decl
, new_decl
);
1818 if (TREE_CODE (old_decl
) != FUNCTION_DECL
1819 || ! DECL_BUILT_IN (old_decl
))
1820 warning ("%Jshadowed declaration is here", old_decl
);
1827 /* Subroutine of pushdecl.
1829 X is a TYPE_DECL for a typedef statement. Create a brand new
1830 ..._TYPE node (which will be just a variant of the existing
1831 ..._TYPE node with identical properties) and then install X
1832 as the TYPE_NAME of this brand new (duplicate) ..._TYPE node.
1834 The whole point here is to end up with a situation where each
1835 and every ..._TYPE node the compiler creates will be uniquely
1836 associated with AT MOST one node representing a typedef name.
1837 This way, even though the compiler substitutes corresponding
1838 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
1839 early on, later parts of the compiler can always do the reverse
1840 translation and get back the corresponding typedef name. For
1843 typedef struct S MY_TYPE;
1846 Later parts of the compiler might only know that `object' was of
1847 type `struct S' if it were not for code just below. With this
1848 code however, later parts of the compiler see something like:
1850 struct S' == struct S
1851 typedef struct S' MY_TYPE;
1854 And they can then deduce (from the node for type struct S') that
1855 the original object declaration was:
1859 Being able to do this is important for proper support of protoize,
1860 and also for generating precise symbolic debugging information
1861 which takes full account of the programmer's (typedef) vocabulary.
1863 Obviously, we don't want to generate a duplicate ..._TYPE node if
1864 the TYPE_DECL node that we are now processing really represents a
1865 standard built-in type.
1867 Since all standard types are effectively declared at line zero
1868 in the source file, we can easily check to see if we are working
1869 on a standard type by checking the current value of lineno. */
1872 clone_underlying_type (tree x
)
1874 if (DECL_IS_BUILTIN (x
))
1876 if (TYPE_NAME (TREE_TYPE (x
)) == 0)
1877 TYPE_NAME (TREE_TYPE (x
)) = x
;
1879 else if (TREE_TYPE (x
) != error_mark_node
1880 && DECL_ORIGINAL_TYPE (x
) == NULL_TREE
)
1882 tree tt
= TREE_TYPE (x
);
1883 DECL_ORIGINAL_TYPE (x
) = tt
;
1884 tt
= build_variant_type_copy (tt
);
1886 TREE_USED (tt
) = TREE_USED (x
);
1891 /* Record a decl-node X as belonging to the current lexical scope.
1892 Check for errors (such as an incompatible declaration for the same
1893 name already seen in the same scope).
1895 Returns either X or an old decl for the same name.
1896 If an old decl is returned, it may have been smashed
1897 to agree with what X says. */
1902 tree name
= DECL_NAME (x
);
1903 struct c_scope
*scope
= current_scope
;
1904 struct c_binding
*b
;
1905 bool nested
= false;
1907 /* Functions need the lang_decl data. */
1908 if (TREE_CODE (x
) == FUNCTION_DECL
&& ! DECL_LANG_SPECIFIC (x
))
1909 DECL_LANG_SPECIFIC (x
) = GGC_CNEW (struct lang_decl
);
1911 /* Must set DECL_CONTEXT for everything not at file scope or
1912 DECL_FILE_SCOPE_P won't work. Local externs don't count
1913 unless they have initializers (which generate code). */
1914 if (current_function_decl
1915 && ((TREE_CODE (x
) != FUNCTION_DECL
&& TREE_CODE (x
) != VAR_DECL
)
1916 || DECL_INITIAL (x
) || !DECL_EXTERNAL (x
)))
1917 DECL_CONTEXT (x
) = current_function_decl
;
1919 /* Anonymous decls are just inserted in the scope. */
1922 bind (name
, x
, scope
, /*invisible=*/false, /*nested=*/false);
1926 /* First, see if there is another declaration with the same name in
1927 the current scope. If there is, duplicate_decls may do all the
1928 work for us. If duplicate_decls returns false, that indicates
1929 two incompatible decls in the same scope; we are to silently
1930 replace the old one (duplicate_decls has issued all appropriate
1931 diagnostics). In particular, we should not consider possible
1932 duplicates in the external scope, or shadowing. */
1933 b
= I_SYMBOL_BINDING (name
);
1934 if (b
&& B_IN_SCOPE (b
, scope
))
1936 if (TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
1937 && COMPLETE_TYPE_P (TREE_TYPE (x
)))
1938 b
->inner_comp
= false;
1939 if (duplicate_decls (x
, b
->decl
))
1942 goto skip_external_and_shadow_checks
;
1945 /* All declarations with external linkage, and all external
1946 references, go in the external scope, no matter what scope is
1947 current. However, the binding in that scope is ignored for
1948 purposes of normal name lookup. A separate binding structure is
1949 created in the requested scope; this governs the normal
1950 visibility of the symbol.
1952 The binding in the externals scope is used exclusively for
1953 detecting duplicate declarations of the same object, no matter
1954 what scope they are in; this is what we do here. (C99 6.2.7p2:
1955 All declarations that refer to the same object or function shall
1956 have compatible type; otherwise, the behavior is undefined.) */
1957 if (DECL_EXTERNAL (x
) || scope
== file_scope
)
1959 tree type
= TREE_TYPE (x
);
1962 bool type_saved
= false;
1963 if (b
&& !B_IN_EXTERNAL_SCOPE (b
)
1964 && (TREE_CODE (b
->decl
) == FUNCTION_DECL
1965 || TREE_CODE (b
->decl
) == VAR_DECL
)
1966 && DECL_FILE_SCOPE_P (b
->decl
))
1969 vistype
= TREE_TYPE (visdecl
);
1971 if (warn_nested_externs
1972 && scope
!= file_scope
1973 && !DECL_IN_SYSTEM_HEADER (x
))
1974 warning ("nested extern declaration of %qD", x
);
1976 while (b
&& !B_IN_EXTERNAL_SCOPE (b
))
1978 /* If this decl might be modified, save its type. This is
1979 done here rather than when the decl is first bound
1980 because the type may change after first binding, through
1981 being completed or through attributes being added. If we
1982 encounter multiple such decls, only the first should have
1983 its type saved; the others will already have had their
1984 proper types saved and the types will not have changed as
1985 their scopes will not have been re-entered. */
1986 if (DECL_FILE_SCOPE_P (b
->decl
) && !type_saved
)
1988 b
->type
= TREE_TYPE (b
->decl
);
1991 if (B_IN_FILE_SCOPE (b
)
1992 && TREE_CODE (b
->decl
) == VAR_DECL
1993 && TREE_STATIC (b
->decl
)
1994 && TREE_CODE (TREE_TYPE (b
->decl
)) == ARRAY_TYPE
1995 && !TYPE_DOMAIN (TREE_TYPE (b
->decl
))
1996 && TREE_CODE (type
) == ARRAY_TYPE
1997 && TYPE_DOMAIN (type
)
1998 && TYPE_MAX_VALUE (TYPE_DOMAIN (type
))
1999 && !integer_zerop (TYPE_MAX_VALUE (TYPE_DOMAIN (type
))))
2001 /* Array type completed in inner scope, which should be
2002 diagnosed if the completion does not have size 1 and
2003 it does not get completed in the file scope. */
2004 b
->inner_comp
= true;
2009 /* If a matching external declaration has been found, set its
2010 type to the composite of all the types of that declaration.
2011 After the consistency checks, it will be reset to the
2012 composite of the visible types only. */
2013 if (b
&& (TREE_PUBLIC (x
) || same_translation_unit_p (x
, b
->decl
))
2015 TREE_TYPE (b
->decl
) = b
->type
;
2017 /* The point of the same_translation_unit_p check here is,
2018 we want to detect a duplicate decl for a construct like
2019 foo() { extern bar(); } ... static bar(); but not if
2020 they are in different translation units. In any case,
2021 the static does not go in the externals scope. */
2023 && (TREE_PUBLIC (x
) || same_translation_unit_p (x
, b
->decl
))
2024 && duplicate_decls (x
, b
->decl
))
2027 thistype
= (vistype
? composite_type (vistype
, type
) : type
);
2028 b
->type
= TREE_TYPE (b
->decl
);
2029 if (TREE_CODE (b
->decl
) == FUNCTION_DECL
&& DECL_BUILT_IN (b
->decl
))
2031 = build_type_attribute_variant (thistype
,
2032 TYPE_ATTRIBUTES (b
->type
));
2033 TREE_TYPE (b
->decl
) = thistype
;
2034 bind (name
, b
->decl
, scope
, /*invisible=*/false, /*nested=*/true);
2037 else if (TREE_PUBLIC (x
))
2039 if (visdecl
&& !b
&& duplicate_decls (x
, visdecl
))
2041 /* An external declaration at block scope referring to a
2042 visible entity with internal linkage. The composite
2043 type will already be correct for this scope, so we
2044 just need to fall through to make the declaration in
2050 bind (name
, x
, external_scope
, /*invisible=*/true,
2056 /* Similarly, a declaration of a function with static linkage at
2057 block scope must be checked against any existing declaration
2058 of that function at file scope. */
2059 else if (TREE_CODE (x
) == FUNCTION_DECL
&& scope
!= file_scope
2060 && !TREE_PUBLIC (x
) && !DECL_INITIAL (x
))
2062 if (warn_nested_externs
&& !DECL_IN_SYSTEM_HEADER (x
))
2063 warning ("nested static declaration of %qD", x
);
2065 while (b
&& !B_IN_FILE_SCOPE (b
))
2068 if (b
&& same_translation_unit_p (x
, b
->decl
)
2069 && duplicate_decls (x
, b
->decl
))
2071 bind (name
, b
->decl
, scope
, /*invisible=*/false, /*nested=*/true);
2076 bind (name
, x
, file_scope
, /*invisible=*/true, /*nested=*/false);
2081 warn_if_shadowing (x
);
2083 skip_external_and_shadow_checks
:
2084 if (TREE_CODE (x
) == TYPE_DECL
)
2085 clone_underlying_type (x
);
2087 bind (name
, x
, scope
, /*invisible=*/false, nested
);
2089 /* If x's type is incomplete because it's based on a
2090 structure or union which has not yet been fully declared,
2091 attach it to that structure or union type, so we can go
2092 back and complete the variable declaration later, if the
2093 structure or union gets fully declared.
2095 If the input is erroneous, we can have error_mark in the type
2096 slot (e.g. "f(void a, ...)") - that doesn't count as an
2098 if (TREE_TYPE (x
) != error_mark_node
2099 && !COMPLETE_TYPE_P (TREE_TYPE (x
)))
2101 tree element
= TREE_TYPE (x
);
2103 while (TREE_CODE (element
) == ARRAY_TYPE
)
2104 element
= TREE_TYPE (element
);
2105 element
= TYPE_MAIN_VARIANT (element
);
2107 if ((TREE_CODE (element
) == RECORD_TYPE
2108 || TREE_CODE (element
) == UNION_TYPE
)
2109 && (TREE_CODE (x
) != TYPE_DECL
2110 || TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
)
2111 && !COMPLETE_TYPE_P (element
))
2112 C_TYPE_INCOMPLETE_VARS (element
)
2113 = tree_cons (NULL_TREE
, x
, C_TYPE_INCOMPLETE_VARS (element
));
2118 /* Record X as belonging to file scope.
2119 This is used only internally by the Objective-C front end,
2120 and is limited to its needs. duplicate_decls is not called;
2121 if there is any preexisting decl for this identifier, it is an ICE. */
2124 pushdecl_top_level (tree x
)
2127 bool nested
= false;
2129 gcc_assert (TREE_CODE (x
) == VAR_DECL
);
2131 name
= DECL_NAME (x
);
2133 gcc_assert (!I_SYMBOL_BINDING (name
));
2135 if (TREE_PUBLIC (x
))
2137 bind (name
, x
, external_scope
, /*invisible=*/true, /*nested=*/false);
2141 bind (name
, x
, file_scope
, /*invisible=*/false, nested
);
2147 implicit_decl_warning (tree id
, tree olddecl
)
2149 void (*diag
) (const char *, ...);
2150 switch (mesg_implicit_function_declaration
)
2153 case 1: diag
= warning
; break;
2154 case 2: diag
= error
; break;
2155 default: gcc_unreachable ();
2158 diag (N_("implicit declaration of function %qE"), id
);
2160 locate_old_decl (olddecl
, diag
);
2163 /* Generate an implicit declaration for identifier FUNCTIONID as a
2164 function of type int (). */
2167 implicitly_declare (tree functionid
)
2169 struct c_binding
*b
;
2173 for (b
= I_SYMBOL_BINDING (functionid
); b
; b
= b
->shadowed
)
2175 if (B_IN_SCOPE (b
, external_scope
))
2184 /* FIXME: Objective-C has weird not-really-builtin functions
2185 which are supposed to be visible automatically. They wind up
2186 in the external scope because they're pushed before the file
2187 scope gets created. Catch this here and rebind them into the
2189 if (!DECL_BUILT_IN (decl
) && DECL_IS_BUILTIN (decl
))
2191 bind (functionid
, decl
, file_scope
,
2192 /*invisible=*/false, /*nested=*/true);
2197 tree newtype
= default_function_type
;
2199 TREE_TYPE (decl
) = b
->type
;
2200 /* Implicit declaration of a function already declared
2201 (somehow) in a different scope, or as a built-in.
2202 If this is the first time this has happened, warn;
2203 then recycle the old declaration but with the new type. */
2204 if (!C_DECL_IMPLICIT (decl
))
2206 implicit_decl_warning (functionid
, decl
);
2207 C_DECL_IMPLICIT (decl
) = 1;
2209 if (DECL_BUILT_IN (decl
))
2211 newtype
= build_type_attribute_variant (newtype
,
2213 (TREE_TYPE (decl
)));
2214 if (!comptypes (newtype
, TREE_TYPE (decl
)))
2216 warning ("incompatible implicit declaration of built-in"
2217 " function %qD", decl
);
2218 newtype
= TREE_TYPE (decl
);
2223 if (!comptypes (newtype
, TREE_TYPE (decl
)))
2225 error ("incompatible implicit declaration of function %qD",
2227 locate_old_decl (decl
, error
);
2230 b
->type
= TREE_TYPE (decl
);
2231 TREE_TYPE (decl
) = newtype
;
2232 bind (functionid
, decl
, current_scope
,
2233 /*invisible=*/false, /*nested=*/true);
2238 /* Not seen before. */
2239 decl
= build_decl (FUNCTION_DECL
, functionid
, default_function_type
);
2240 DECL_EXTERNAL (decl
) = 1;
2241 TREE_PUBLIC (decl
) = 1;
2242 C_DECL_IMPLICIT (decl
) = 1;
2243 implicit_decl_warning (functionid
, 0);
2244 asmspec_tree
= maybe_apply_renaming_pragma (decl
, /*asmname=*/NULL
);
2246 set_user_assembler_name (decl
, TREE_STRING_POINTER (asmspec_tree
));
2248 /* C89 says implicit declarations are in the innermost block.
2249 So we record the decl in the standard fashion. */
2250 decl
= pushdecl (decl
);
2252 /* No need to call objc_check_decl here - it's a function type. */
2253 rest_of_decl_compilation (decl
, 0, 0);
2255 /* Write a record describing this implicit function declaration
2256 to the prototypes file (if requested). */
2257 gen_aux_info_record (decl
, 0, 1, 0);
2259 /* Possibly apply some default attributes to this implicit declaration. */
2260 decl_attributes (&decl
, NULL_TREE
, 0);
2265 /* Issue an error message for a reference to an undeclared variable
2266 ID, including a reference to a builtin outside of function-call
2267 context. Establish a binding of the identifier to error_mark_node
2268 in an appropriate scope, which will suppress further errors for the
2271 undeclared_variable (tree id
)
2273 static bool already
= false;
2274 struct c_scope
*scope
;
2276 if (current_function_decl
== 0)
2278 error ("%qE undeclared here (not in a function)", id
);
2279 scope
= current_scope
;
2283 error ("%qE undeclared (first use in this function)", id
);
2287 error ("(Each undeclared identifier is reported only once");
2288 error ("for each function it appears in.)");
2292 /* If we are parsing old-style parameter decls, current_function_decl
2293 will be nonnull but current_function_scope will be null. */
2294 scope
= current_function_scope
? current_function_scope
: current_scope
;
2296 bind (id
, error_mark_node
, scope
, /*invisible=*/false, /*nested=*/false);
2299 /* Subroutine of lookup_label, declare_label, define_label: construct a
2300 LABEL_DECL with all the proper frills. */
2303 make_label (tree name
, location_t location
)
2305 tree label
= build_decl (LABEL_DECL
, name
, void_type_node
);
2307 DECL_CONTEXT (label
) = current_function_decl
;
2308 DECL_MODE (label
) = VOIDmode
;
2309 DECL_SOURCE_LOCATION (label
) = location
;
2314 /* Get the LABEL_DECL corresponding to identifier NAME as a label.
2315 Create one if none exists so far for the current function.
2316 This is called when a label is used in a goto expression or
2317 has its address taken. */
2320 lookup_label (tree name
)
2324 if (current_function_decl
== 0)
2326 error ("label %qs referenced outside of any function",
2327 IDENTIFIER_POINTER (name
));
2331 /* Use a label already defined or ref'd with this name, but not if
2332 it is inherited from a containing function and wasn't declared
2334 label
= I_LABEL_DECL (name
);
2335 if (label
&& (DECL_CONTEXT (label
) == current_function_decl
2336 || C_DECLARED_LABEL_FLAG (label
)))
2338 /* If the label has only been declared, update its apparent
2339 location to point here, for better diagnostics if it
2340 turns out not to have been defined. */
2341 if (!TREE_USED (label
))
2342 DECL_SOURCE_LOCATION (label
) = input_location
;
2346 /* No label binding for that identifier; make one. */
2347 label
= make_label (name
, input_location
);
2349 /* Ordinary labels go in the current function scope. */
2350 bind (name
, label
, current_function_scope
,
2351 /*invisible=*/false, /*nested=*/false);
2355 /* Make a label named NAME in the current function, shadowing silently
2356 any that may be inherited from containing functions or containing
2357 scopes. This is called for __label__ declarations. */
2360 declare_label (tree name
)
2362 struct c_binding
*b
= I_LABEL_BINDING (name
);
2365 /* Check to make sure that the label hasn't already been declared
2367 if (b
&& B_IN_CURRENT_SCOPE (b
))
2369 error ("duplicate label declaration %qs", IDENTIFIER_POINTER (name
));
2370 locate_old_decl (b
->decl
, error
);
2372 /* Just use the previous declaration. */
2376 label
= make_label (name
, input_location
);
2377 C_DECLARED_LABEL_FLAG (label
) = 1;
2379 /* Declared labels go in the current scope. */
2380 bind (name
, label
, current_scope
,
2381 /*invisible=*/false, /*nested=*/false);
2385 /* Define a label, specifying the location in the source file.
2386 Return the LABEL_DECL node for the label, if the definition is valid.
2387 Otherwise return 0. */
2390 define_label (location_t location
, tree name
)
2392 /* Find any preexisting label with this name. It is an error
2393 if that label has already been defined in this function, or
2394 if there is a containing function with a declared label with
2396 tree label
= I_LABEL_DECL (name
);
2399 && ((DECL_CONTEXT (label
) == current_function_decl
2400 && DECL_INITIAL (label
) != 0)
2401 || (DECL_CONTEXT (label
) != current_function_decl
2402 && C_DECLARED_LABEL_FLAG (label
))))
2404 error ("%Hduplicate label %qD", &location
, label
);
2405 locate_old_decl (label
, error
);
2408 else if (label
&& DECL_CONTEXT (label
) == current_function_decl
)
2410 /* The label has been used or declared already in this function,
2411 but not defined. Update its location to point to this
2413 DECL_SOURCE_LOCATION (label
) = location
;
2417 /* No label binding for that identifier; make one. */
2418 label
= make_label (name
, location
);
2420 /* Ordinary labels go in the current function scope. */
2421 bind (name
, label
, current_function_scope
,
2422 /*invisible=*/false, /*nested=*/false);
2425 if (warn_traditional
&& !in_system_header
&& lookup_name (name
))
2426 warning ("%Htraditional C lacks a separate namespace for labels, "
2427 "identifier %qs conflicts", &location
,
2428 IDENTIFIER_POINTER (name
));
2430 /* Mark label as having been defined. */
2431 DECL_INITIAL (label
) = error_mark_node
;
2435 /* Given NAME, an IDENTIFIER_NODE,
2436 return the structure (or union or enum) definition for that name.
2437 If THISLEVEL_ONLY is nonzero, searches only the current_scope.
2438 CODE says which kind of type the caller wants;
2439 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2440 If the wrong kind of type is found, an error is reported. */
2443 lookup_tag (enum tree_code code
, tree name
, int thislevel_only
)
2445 struct c_binding
*b
= I_TAG_BINDING (name
);
2451 /* We only care about whether it's in this level if
2452 thislevel_only was set or it might be a type clash. */
2453 if (thislevel_only
|| TREE_CODE (b
->decl
) != code
)
2455 /* For our purposes, a tag in the external scope is the same as
2456 a tag in the file scope. (Primarily relevant to Objective-C
2457 and its builtin structure tags, which get pushed before the
2458 file scope is created.) */
2459 if (B_IN_CURRENT_SCOPE (b
)
2460 || (current_scope
== file_scope
&& B_IN_EXTERNAL_SCOPE (b
)))
2464 if (thislevel_only
&& !thislevel
)
2467 if (TREE_CODE (b
->decl
) != code
)
2469 /* Definition isn't the kind we were looking for. */
2470 pending_invalid_xref
= name
;
2471 pending_invalid_xref_location
= input_location
;
2473 /* If in the same binding level as a declaration as a tag
2474 of a different type, this must not be allowed to
2475 shadow that tag, so give the error immediately.
2476 (For example, "struct foo; union foo;" is invalid.) */
2478 pending_xref_error ();
2483 /* Print an error message now
2484 for a recent invalid struct, union or enum cross reference.
2485 We don't print them immediately because they are not invalid
2486 when used in the `struct foo;' construct for shadowing. */
2489 pending_xref_error (void)
2491 if (pending_invalid_xref
!= 0)
2492 error ("%H%qs defined as wrong kind of tag",
2493 &pending_invalid_xref_location
,
2494 IDENTIFIER_POINTER (pending_invalid_xref
));
2495 pending_invalid_xref
= 0;
2499 /* Look up NAME in the current scope and its superiors
2500 in the namespace of variables, functions and typedefs.
2501 Return a ..._DECL node of some kind representing its definition,
2502 or return 0 if it is undefined. */
2505 lookup_name (tree name
)
2507 struct c_binding
*b
= I_SYMBOL_BINDING (name
);
2508 if (b
&& !b
->invisible
)
2513 /* Similar to `lookup_name' but look only at the indicated scope. */
2516 lookup_name_in_scope (tree name
, struct c_scope
*scope
)
2518 struct c_binding
*b
;
2520 for (b
= I_SYMBOL_BINDING (name
); b
; b
= b
->shadowed
)
2521 if (B_IN_SCOPE (b
, scope
))
2526 /* Create the predefined scalar types of C,
2527 and some nodes representing standard constants (0, 1, (void *) 0).
2528 Initialize the global scope.
2529 Make definitions for built-in primitive functions. */
2532 c_init_decl_processing (void)
2535 tree ptr_ftype_void
, ptr_ftype_ptr
;
2536 location_t save_loc
= input_location
;
2538 /* Adds some ggc roots, and reserved words for c-parse.in. */
2541 current_function_decl
= 0;
2543 gcc_obstack_init (&parser_obstack
);
2545 /* Make the externals scope. */
2547 external_scope
= current_scope
;
2549 /* Declarations from c_common_nodes_and_builtins must not be associated
2550 with this input file, lest we get differences between using and not
2551 using preprocessed headers. */
2552 #ifdef USE_MAPPED_LOCATION
2553 input_location
= BUILTINS_LOCATION
;
2555 input_location
.file
= "<built-in>";
2556 input_location
.line
= 0;
2559 build_common_tree_nodes (flag_signed_char
, false);
2561 c_common_nodes_and_builtins ();
2563 /* In C, comparisons and TRUTH_* expressions have type int. */
2564 truthvalue_type_node
= integer_type_node
;
2565 truthvalue_true_node
= integer_one_node
;
2566 truthvalue_false_node
= integer_zero_node
;
2568 /* Even in C99, which has a real boolean type. */
2569 pushdecl (build_decl (TYPE_DECL
, get_identifier ("_Bool"),
2570 boolean_type_node
));
2572 endlink
= void_list_node
;
2573 ptr_ftype_void
= build_function_type (ptr_type_node
, endlink
);
2575 = build_function_type (ptr_type_node
,
2576 tree_cons (NULL_TREE
, ptr_type_node
, endlink
));
2578 input_location
= save_loc
;
2580 pedantic_lvalues
= true;
2582 make_fname_decl
= c_make_fname_decl
;
2583 start_fname_decls ();
2586 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
2587 decl, NAME is the initialization string and TYPE_DEP indicates whether
2588 NAME depended on the type of the function. As we don't yet implement
2589 delayed emission of static data, we mark the decl as emitted
2590 so it is not placed in the output. Anything using it must therefore pull
2591 out the STRING_CST initializer directly. FIXME. */
2594 c_make_fname_decl (tree id
, int type_dep
)
2596 const char *name
= fname_as_string (type_dep
);
2597 tree decl
, type
, init
;
2598 size_t length
= strlen (name
);
2600 type
= build_array_type
2601 (build_qualified_type (char_type_node
, TYPE_QUAL_CONST
),
2602 build_index_type (size_int (length
)));
2604 decl
= build_decl (VAR_DECL
, id
, type
);
2606 TREE_STATIC (decl
) = 1;
2607 TREE_READONLY (decl
) = 1;
2608 DECL_ARTIFICIAL (decl
) = 1;
2610 init
= build_string (length
+ 1, name
);
2611 free ((char *) name
);
2612 TREE_TYPE (init
) = type
;
2613 DECL_INITIAL (decl
) = init
;
2615 TREE_USED (decl
) = 1;
2617 if (current_function_decl
)
2619 DECL_CONTEXT (decl
) = current_function_decl
;
2620 bind (id
, decl
, current_function_scope
,
2621 /*invisible=*/false, /*nested=*/false);
2624 finish_decl (decl
, init
, NULL_TREE
);
2629 /* Return a definition for a builtin function named NAME and whose data type
2630 is TYPE. TYPE should be a function type with argument types.
2631 FUNCTION_CODE tells later passes how to compile calls to this function.
2632 See tree.h for its possible values.
2634 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
2635 the name to be called if we can't opencode the function. If
2636 ATTRS is nonzero, use that for the function's attribute list. */
2639 builtin_function (const char *name
, tree type
, int function_code
,
2640 enum built_in_class cl
, const char *library_name
,
2643 tree id
= get_identifier (name
);
2644 tree decl
= build_decl (FUNCTION_DECL
, id
, type
);
2645 TREE_PUBLIC (decl
) = 1;
2646 DECL_EXTERNAL (decl
) = 1;
2647 DECL_LANG_SPECIFIC (decl
) = GGC_CNEW (struct lang_decl
);
2648 DECL_BUILT_IN_CLASS (decl
) = cl
;
2649 DECL_FUNCTION_CODE (decl
) = function_code
;
2651 SET_DECL_ASSEMBLER_NAME (decl
, get_identifier (library_name
));
2653 /* Should never be called on a symbol with a preexisting meaning. */
2654 gcc_assert (!I_SYMBOL_BINDING (id
));
2656 bind (id
, decl
, external_scope
, /*invisible=*/true, /*nested=*/false);
2658 /* Builtins in the implementation namespace are made visible without
2659 needing to be explicitly declared. See push_file_scope. */
2660 if (name
[0] == '_' && (name
[1] == '_' || ISUPPER (name
[1])))
2662 TREE_CHAIN (decl
) = visible_builtins
;
2663 visible_builtins
= decl
;
2666 /* Possibly apply some default attributes to this built-in function. */
2668 decl_attributes (&decl
, attrs
, ATTR_FLAG_BUILT_IN
);
2670 decl_attributes (&decl
, NULL_TREE
, 0);
2675 /* Called when a declaration is seen that contains no names to declare.
2676 If its type is a reference to a structure, union or enum inherited
2677 from a containing scope, shadow that tag name for the current scope
2678 with a forward reference.
2679 If its type defines a new named structure or union
2680 or defines an enum, it is valid but we need not do anything here.
2681 Otherwise, it is an error. */
2684 shadow_tag (const struct c_declspecs
*declspecs
)
2686 shadow_tag_warned (declspecs
, 0);
2689 /* WARNED is 1 if we have done a pedwarn, 2 if we have done a warning,
2692 shadow_tag_warned (const struct c_declspecs
*declspecs
, int warned
)
2694 bool found_tag
= false;
2696 pending_invalid_xref
= 0;
2698 if (declspecs
->type
&& !declspecs
->default_int_p
&& !declspecs
->typedef_p
)
2700 tree value
= declspecs
->type
;
2701 enum tree_code code
= TREE_CODE (value
);
2703 if (code
== RECORD_TYPE
|| code
== UNION_TYPE
|| code
== ENUMERAL_TYPE
)
2704 /* Used to test also that TYPE_SIZE (value) != 0.
2705 That caused warning for `struct foo;' at top level in the file. */
2707 tree name
= TYPE_NAME (value
);
2714 if (warned
!= 1 && code
!= ENUMERAL_TYPE
)
2715 /* Empty unnamed enum OK */
2717 pedwarn ("unnamed struct/union that defines no instances");
2723 t
= lookup_tag (code
, name
, 1);
2727 t
= make_node (code
);
2734 if (warned
!= 1 && !in_system_header
)
2736 pedwarn ("useless type name in empty declaration");
2741 else if (warned
!= 1 && !in_system_header
&& declspecs
->typedef_p
)
2743 pedwarn ("useless type name in empty declaration");
2747 if (declspecs
->inline_p
)
2749 error ("%<inline%> in empty declaration");
2753 if (current_scope
== file_scope
&& declspecs
->storage_class
== csc_auto
)
2755 error ("%<auto%> in file-scope empty declaration");
2759 if (current_scope
== file_scope
&& declspecs
->storage_class
== csc_register
)
2761 error ("%<register%> in file-scope empty declaration");
2765 if (!warned
&& !in_system_header
&& declspecs
->storage_class
!= csc_none
)
2767 warning ("useless storage class specifier in empty declaration");
2771 if (!warned
&& !in_system_header
&& declspecs
->thread_p
)
2773 warning ("useless %<__thread%> in empty declaration");
2777 if (!warned
&& !in_system_header
&& (declspecs
->const_p
2778 || declspecs
->volatile_p
2779 || declspecs
->restrict_p
))
2781 warning ("useless type qualifier in empty declaration");
2788 pedwarn ("empty declaration");
2793 /* Return the qualifiers from SPECS as a bitwise OR of TYPE_QUAL_*
2794 bits. SPECS represents declaration specifiers that the grammar
2795 only permits to contain type qualifiers and attributes. */
2798 quals_from_declspecs (const struct c_declspecs
*specs
)
2800 int quals
= ((specs
->const_p
? TYPE_QUAL_CONST
: 0)
2801 | (specs
->volatile_p
? TYPE_QUAL_VOLATILE
: 0)
2802 | (specs
->restrict_p
? TYPE_QUAL_RESTRICT
: 0));
2803 gcc_assert (!specs
->type
2804 && !specs
->decl_attr
2805 && specs
->typespec_word
== cts_none
2806 && specs
->storage_class
== csc_none
2807 && !specs
->typedef_p
2808 && !specs
->explicit_signed_p
2809 && !specs
->deprecated_p
2811 && !specs
->long_long_p
2814 && !specs
->unsigned_p
2815 && !specs
->complex_p
2817 && !specs
->thread_p
);
2821 /* Construct an array declarator. EXPR is the expression inside [], or
2822 NULL_TREE. QUALS are the type qualifiers inside the [] (to be applied
2823 to the pointer to which a parameter array is converted). STATIC_P is
2824 true if "static" is inside the [], false otherwise. VLA_UNSPEC_P
2825 is true if the array is [*], a VLA of unspecified length which is
2826 nevertheless a complete type (not currently implemented by GCC),
2827 false otherwise. The field for the contained declarator is left to be
2828 filled in by set_array_declarator_inner. */
2830 struct c_declarator
*
2831 build_array_declarator (tree expr
, struct c_declspecs
*quals
, bool static_p
,
2834 struct c_declarator
*declarator
= XOBNEW (&parser_obstack
,
2835 struct c_declarator
);
2836 declarator
->kind
= cdk_array
;
2837 declarator
->declarator
= 0;
2838 declarator
->u
.array
.dimen
= expr
;
2841 declarator
->u
.array
.attrs
= quals
->attrs
;
2842 declarator
->u
.array
.quals
= quals_from_declspecs (quals
);
2846 declarator
->u
.array
.attrs
= NULL_TREE
;
2847 declarator
->u
.array
.quals
= 0;
2849 declarator
->u
.array
.static_p
= static_p
;
2850 declarator
->u
.array
.vla_unspec_p
= vla_unspec_p
;
2851 if (pedantic
&& !flag_isoc99
)
2853 if (static_p
|| quals
!= NULL
)
2854 pedwarn ("ISO C90 does not support %<static%> or type "
2855 "qualifiers in parameter array declarators");
2857 pedwarn ("ISO C90 does not support %<[*]%> array declarators");
2860 warning ("GCC does not yet properly implement %<[*]%> array declarators");
2864 /* Set the contained declarator of an array declarator. DECL is the
2865 declarator, as constructed by build_array_declarator; INNER is what
2866 appears on the left of the []. ABSTRACT_P is true if it is an
2867 abstract declarator, false otherwise; this is used to reject static
2868 and type qualifiers in abstract declarators, where they are not in
2869 the C99 grammar (subject to possible change in DR#289). */
2871 struct c_declarator
*
2872 set_array_declarator_inner (struct c_declarator
*decl
,
2873 struct c_declarator
*inner
, bool abstract_p
)
2875 decl
->declarator
= inner
;
2876 if (abstract_p
&& (decl
->u
.array
.quals
!= TYPE_UNQUALIFIED
2877 || decl
->u
.array
.attrs
!= NULL_TREE
2878 || decl
->u
.array
.static_p
))
2879 error ("static or type qualifiers in abstract declarator");
2883 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
2886 groktypename (struct c_type_name
*type_name
)
2889 tree attrs
= type_name
->specs
->attrs
;
2891 type_name
->specs
->attrs
= NULL_TREE
;
2893 type
= grokdeclarator (type_name
->declarator
, type_name
->specs
, TYPENAME
,
2896 /* Apply attributes. */
2897 decl_attributes (&type
, attrs
, 0);
2902 /* Decode a declarator in an ordinary declaration or data definition.
2903 This is called as soon as the type information and variable name
2904 have been parsed, before parsing the initializer if any.
2905 Here we create the ..._DECL node, fill in its type,
2906 and put it on the list of decls for the current context.
2907 The ..._DECL node is returned as the value.
2909 Exception: for arrays where the length is not specified,
2910 the type is left null, to be filled in by `finish_decl'.
2912 Function definitions do not come here; they go to start_function
2913 instead. However, external and forward declarations of functions
2914 do go through here. Structure field declarations are done by
2915 grokfield and not through here. */
2918 start_decl (struct c_declarator
*declarator
, struct c_declspecs
*declspecs
,
2919 bool initialized
, tree attributes
)
2924 /* An object declared as __attribute__((deprecated)) suppresses
2925 warnings of uses of other deprecated items. */
2926 if (lookup_attribute ("deprecated", attributes
))
2927 deprecated_state
= DEPRECATED_SUPPRESS
;
2929 decl
= grokdeclarator (declarator
, declspecs
,
2930 NORMAL
, initialized
, NULL
);
2932 deprecated_state
= DEPRECATED_NORMAL
;
2934 if (warn_main
> 0 && TREE_CODE (decl
) != FUNCTION_DECL
2935 && MAIN_NAME_P (DECL_NAME (decl
)))
2936 warning ("%J%qD is usually a function", decl
, decl
);
2939 /* Is it valid for this decl to have an initializer at all?
2940 If not, set INITIALIZED to zero, which will indirectly
2941 tell 'finish_decl' to ignore the initializer once it is parsed. */
2942 switch (TREE_CODE (decl
))
2945 error ("typedef %qD is initialized (use __typeof__ instead)", decl
);
2950 error ("function %qD is initialized like a variable", decl
);
2955 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
2956 error ("parameter %qD is initialized", decl
);
2961 /* Don't allow initializations for incomplete types except for
2962 arrays which might be completed by the initialization. */
2964 /* This can happen if the array size is an undefined macro.
2965 We already gave a warning, so we don't need another one. */
2966 if (TREE_TYPE (decl
) == error_mark_node
)
2968 else if (COMPLETE_TYPE_P (TREE_TYPE (decl
)))
2970 /* A complete type is ok if size is fixed. */
2972 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl
))) != INTEGER_CST
2973 || C_DECL_VARIABLE_SIZE (decl
))
2975 error ("variable-sized object may not be initialized");
2979 else if (TREE_CODE (TREE_TYPE (decl
)) != ARRAY_TYPE
)
2981 error ("variable %qD has initializer but incomplete type", decl
);
2984 else if (!COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (decl
))))
2986 error ("elements of array %qD have incomplete type", decl
);
2993 if (current_scope
== file_scope
)
2994 TREE_STATIC (decl
) = 1;
2996 /* Tell 'pushdecl' this is an initialized decl
2997 even though we don't yet have the initializer expression.
2998 Also tell 'finish_decl' it may store the real initializer. */
2999 DECL_INITIAL (decl
) = error_mark_node
;
3002 /* If this is a function declaration, write a record describing it to the
3003 prototypes file (if requested). */
3005 if (TREE_CODE (decl
) == FUNCTION_DECL
)
3006 gen_aux_info_record (decl
, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl
)) != 0);
3008 /* ANSI specifies that a tentative definition which is not merged with
3009 a non-tentative definition behaves exactly like a definition with an
3010 initializer equal to zero. (Section 3.7.2)
3012 -fno-common gives strict ANSI behavior, though this tends to break
3013 a large body of code that grew up without this rule.
3015 Thread-local variables are never common, since there's no entrenched
3016 body of code to break, and it allows more efficient variable references
3017 in the presence of dynamic linking. */
3019 if (TREE_CODE (decl
) == VAR_DECL
3021 && TREE_PUBLIC (decl
)
3022 && !DECL_THREAD_LOCAL (decl
)
3024 DECL_COMMON (decl
) = 1;
3026 /* Set attributes here so if duplicate decl, will have proper attributes. */
3027 decl_attributes (&decl
, attributes
, 0);
3029 if (TREE_CODE (decl
) == FUNCTION_DECL
3030 && targetm
.calls
.promote_prototypes (TREE_TYPE (decl
)))
3032 struct c_declarator
*ce
= declarator
;
3034 if (ce
->kind
== cdk_pointer
)
3035 ce
= declarator
->declarator
;
3036 if (ce
->kind
== cdk_function
)
3038 tree args
= ce
->u
.arg_info
->parms
;
3039 for (; args
; args
= TREE_CHAIN (args
))
3041 tree type
= TREE_TYPE (args
);
3042 if (type
&& INTEGRAL_TYPE_P (type
)
3043 && TYPE_PRECISION (type
) < TYPE_PRECISION (integer_type_node
))
3044 DECL_ARG_TYPE (args
) = integer_type_node
;
3049 if (TREE_CODE (decl
) == FUNCTION_DECL
3050 && DECL_DECLARED_INLINE_P (decl
)
3051 && DECL_UNINLINABLE (decl
)
3052 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl
)))
3053 warning ("%Jinline function %qD given attribute noinline", decl
, decl
);
3055 /* Add this decl to the current scope.
3056 TEM may equal DECL or it may be a previous decl of the same name. */
3057 tem
= pushdecl (decl
);
3059 if (initialized
&& DECL_EXTERNAL (tem
))
3061 DECL_EXTERNAL (tem
) = 0;
3062 TREE_STATIC (tem
) = 1;
3068 /* Finish processing of a declaration;
3069 install its initial value.
3070 If the length of an array type is not known before,
3071 it must be determined now, from the initial value, or it is an error. */
3074 finish_decl (tree decl
, tree init
, tree asmspec_tree
)
3076 tree type
= TREE_TYPE (decl
);
3077 int was_incomplete
= (DECL_SIZE (decl
) == 0);
3078 const char *asmspec
= 0;
3080 /* If a name was specified, get the string. */
3081 if ((TREE_CODE (decl
) == FUNCTION_DECL
|| TREE_CODE (decl
) == VAR_DECL
)
3082 && DECL_FILE_SCOPE_P (decl
))
3083 asmspec_tree
= maybe_apply_renaming_pragma (decl
, asmspec_tree
);
3085 asmspec
= TREE_STRING_POINTER (asmspec_tree
);
3087 /* If `start_decl' didn't like having an initialization, ignore it now. */
3088 if (init
!= 0 && DECL_INITIAL (decl
) == 0)
3091 /* Don't crash if parm is initialized. */
3092 if (TREE_CODE (decl
) == PARM_DECL
)
3096 store_init_value (decl
, init
);
3098 if (c_dialect_objc () && (TREE_CODE (decl
) == VAR_DECL
3099 || TREE_CODE (decl
) == FUNCTION_DECL
3100 || TREE_CODE (decl
) == FIELD_DECL
))
3101 objc_check_decl (decl
);
3103 /* Deduce size of array from initialization, if not already known. */
3104 if (TREE_CODE (type
) == ARRAY_TYPE
3105 && TYPE_DOMAIN (type
) == 0
3106 && TREE_CODE (decl
) != TYPE_DECL
)
3109 = (TREE_STATIC (decl
)
3110 /* Even if pedantic, an external linkage array
3111 may have incomplete type at first. */
3112 ? pedantic
&& !TREE_PUBLIC (decl
)
3113 : !DECL_EXTERNAL (decl
));
3115 = complete_array_type (type
, DECL_INITIAL (decl
), do_default
);
3117 /* Get the completed type made by complete_array_type. */
3118 type
= TREE_TYPE (decl
);
3121 error ("%Jinitializer fails to determine size of %qD", decl
, decl
);
3123 else if (failure
== 2)
3126 error ("%Jarray size missing in %qD", decl
, decl
);
3127 /* If a `static' var's size isn't known,
3128 make it extern as well as static, so it does not get
3130 If it is not `static', then do not mark extern;
3131 finish_incomplete_decl will give it a default size
3132 and it will get allocated. */
3133 else if (!pedantic
&& TREE_STATIC (decl
) && ! TREE_PUBLIC (decl
))
3134 DECL_EXTERNAL (decl
) = 1;
3137 /* TYPE_MAX_VALUE is always one less than the number of elements
3138 in the array, because we start counting at zero. Therefore,
3139 warn only if the value is less than zero. */
3140 else if (pedantic
&& TYPE_DOMAIN (type
) != 0
3141 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type
))) < 0)
3142 error ("%Jzero or negative size array %qD", decl
, decl
);
3144 layout_decl (decl
, 0);
3147 if (TREE_CODE (decl
) == VAR_DECL
)
3149 if (DECL_SIZE (decl
) == 0 && TREE_TYPE (decl
) != error_mark_node
3150 && COMPLETE_TYPE_P (TREE_TYPE (decl
)))
3151 layout_decl (decl
, 0);
3153 if (DECL_SIZE (decl
) == 0
3154 /* Don't give an error if we already gave one earlier. */
3155 && TREE_TYPE (decl
) != error_mark_node
3156 && (TREE_STATIC (decl
)
3157 /* A static variable with an incomplete type
3158 is an error if it is initialized.
3159 Also if it is not file scope.
3160 Otherwise, let it through, but if it is not `extern'
3161 then it may cause an error message later. */
3162 ? (DECL_INITIAL (decl
) != 0
3163 || !DECL_FILE_SCOPE_P (decl
))
3164 /* An automatic variable with an incomplete type
3166 : !DECL_EXTERNAL (decl
)))
3168 error ("%Jstorage size of %qD isn%'t known", decl
, decl
);
3169 TREE_TYPE (decl
) = error_mark_node
;
3172 if ((DECL_EXTERNAL (decl
) || TREE_STATIC (decl
))
3173 && DECL_SIZE (decl
) != 0)
3175 if (TREE_CODE (DECL_SIZE (decl
)) == INTEGER_CST
)
3176 constant_expression_warning (DECL_SIZE (decl
));
3178 error ("%Jstorage size of %qD isn%'t constant", decl
, decl
);
3181 if (TREE_USED (type
))
3182 TREE_USED (decl
) = 1;
3185 /* If this is a function and an assembler name is specified, reset DECL_RTL
3186 so we can give it its new name. Also, update built_in_decls if it
3187 was a normal built-in. */
3188 if (TREE_CODE (decl
) == FUNCTION_DECL
&& asmspec
)
3190 if (DECL_BUILT_IN_CLASS (decl
) == BUILT_IN_NORMAL
)
3192 tree builtin
= built_in_decls
[DECL_FUNCTION_CODE (decl
)];
3193 set_user_assembler_name (builtin
, asmspec
);
3194 if (DECL_FUNCTION_CODE (decl
) == BUILT_IN_MEMCPY
)
3195 init_block_move_fn (asmspec
);
3196 else if (DECL_FUNCTION_CODE (decl
) == BUILT_IN_MEMSET
)
3197 init_block_clear_fn (asmspec
);
3199 set_user_assembler_name (decl
, asmspec
);
3202 /* If #pragma weak was used, mark the decl weak now. */
3203 if (current_scope
== file_scope
)
3204 maybe_apply_pragma_weak (decl
);
3206 /* If this is a variable definition, determine its ELF visibility. */
3207 if (TREE_CODE (decl
) == VAR_DECL
3208 && TREE_STATIC (decl
)
3209 && !DECL_EXTERNAL (decl
))
3210 c_determine_visibility (decl
);
3212 /* Output the assembler code and/or RTL code for variables and functions,
3213 unless the type is an undefined structure or union.
3214 If not, it will get done when the type is completed. */
3216 if (TREE_CODE (decl
) == VAR_DECL
|| TREE_CODE (decl
) == FUNCTION_DECL
)
3218 /* This is a no-op in c-lang.c or something real in objc-act.c. */
3219 if (c_dialect_objc ())
3220 objc_check_decl (decl
);
3224 /* If this is not a static variable, issue a warning.
3225 It doesn't make any sense to give an ASMSPEC for an
3226 ordinary, non-register local variable. Historically,
3227 GCC has accepted -- but ignored -- the ASMSPEC in
3229 if (! DECL_FILE_SCOPE_P (decl
)
3230 && TREE_CODE (decl
) == VAR_DECL
3231 && !C_DECL_REGISTER (decl
)
3232 && !TREE_STATIC (decl
))
3233 warning ("%Jignoring asm-specifier for non-static local "
3234 "variable %qD", decl
, decl
);
3235 else if (C_DECL_REGISTER (decl
))
3236 change_decl_assembler_name (decl
, get_identifier (asmspec
));
3238 set_user_assembler_name (decl
, asmspec
);
3241 if (DECL_FILE_SCOPE_P (decl
))
3243 if (DECL_INITIAL (decl
) == NULL_TREE
3244 || DECL_INITIAL (decl
) == error_mark_node
)
3245 /* Don't output anything
3246 when a tentative file-scope definition is seen.
3247 But at end of compilation, do output code for them. */
3248 DECL_DEFER_OUTPUT (decl
) = 1;
3249 rest_of_decl_compilation (decl
, true, 0);
3253 /* In conjunction with an ASMSPEC, the `register'
3254 keyword indicates that we should place the variable
3255 in a particular register. */
3256 if (asmspec
&& C_DECL_REGISTER (decl
))
3258 DECL_HARD_REGISTER (decl
) = 1;
3259 /* This cannot be done for a structure with volatile
3260 fields, on which DECL_REGISTER will have been
3262 if (!DECL_REGISTER (decl
))
3263 error ("cannot put object with volatile field into register");
3266 if (TREE_CODE (decl
) != FUNCTION_DECL
)
3268 /* If we're building a variable sized type, and we might be
3269 reachable other than via the top of the current binding
3270 level, then create a new BIND_EXPR so that we deallocate
3271 the object at the right time. */
3272 /* Note that DECL_SIZE can be null due to errors. */
3273 if (DECL_SIZE (decl
)
3274 && !TREE_CONSTANT (DECL_SIZE (decl
))
3275 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list
))
3278 bind
= build3 (BIND_EXPR
, void_type_node
, NULL
, NULL
, NULL
);
3279 TREE_SIDE_EFFECTS (bind
) = 1;
3281 BIND_EXPR_BODY (bind
) = push_stmt_list ();
3283 add_stmt (build_stmt (DECL_EXPR
, decl
));
3288 if (!DECL_FILE_SCOPE_P (decl
))
3290 /* Recompute the RTL of a local array now
3291 if it used to be an incomplete type. */
3293 && ! TREE_STATIC (decl
) && ! DECL_EXTERNAL (decl
))
3295 /* If we used it already as memory, it must stay in memory. */
3296 TREE_ADDRESSABLE (decl
) = TREE_USED (decl
);
3297 /* If it's still incomplete now, no init will save it. */
3298 if (DECL_SIZE (decl
) == 0)
3299 DECL_INITIAL (decl
) = 0;
3304 /* If this was marked 'used', be sure it will be output. */
3305 if (lookup_attribute ("used", DECL_ATTRIBUTES (decl
)))
3306 mark_decl_referenced (decl
);
3308 if (TREE_CODE (decl
) == TYPE_DECL
)
3310 if (!DECL_FILE_SCOPE_P (decl
)
3311 && variably_modified_type_p (TREE_TYPE (decl
), NULL_TREE
))
3312 add_stmt (build_stmt (DECL_EXPR
, decl
));
3314 rest_of_decl_compilation (decl
, DECL_FILE_SCOPE_P (decl
), 0);
3317 /* At the end of a declaration, throw away any variable type sizes
3318 of types defined inside that declaration. There is no use
3319 computing them in the following function definition. */
3320 if (current_scope
== file_scope
)
3321 get_pending_sizes ();
3323 /* Install a cleanup (aka destructor) if one was given. */
3324 if (TREE_CODE (decl
) == VAR_DECL
&& !TREE_STATIC (decl
))
3326 tree attr
= lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl
));
3329 tree cleanup_id
= TREE_VALUE (TREE_VALUE (attr
));
3330 tree cleanup_decl
= lookup_name (cleanup_id
);
3333 /* Build "cleanup(&decl)" for the destructor. */
3334 cleanup
= build_unary_op (ADDR_EXPR
, decl
, 0);
3335 cleanup
= build_tree_list (NULL_TREE
, cleanup
);
3336 cleanup
= build_function_call (cleanup_decl
, cleanup
);
3338 /* Don't warn about decl unused; the cleanup uses it. */
3339 TREE_USED (decl
) = 1;
3340 TREE_USED (cleanup_decl
) = 1;
3342 /* Initialize EH, if we've been told to do so. */
3343 if (flag_exceptions
&& !c_eh_initialized_p
)
3345 c_eh_initialized_p
= true;
3346 eh_personality_libfunc
3347 = init_one_libfunc (USING_SJLJ_EXCEPTIONS
3348 ? "__gcc_personality_sj0"
3349 : "__gcc_personality_v0");
3350 using_eh_for_cleanups ();
3353 push_cleanup (decl
, cleanup
, false);
3358 /* Given a parsed parameter declaration, decode it into a PARM_DECL. */
3361 grokparm (const struct c_parm
*parm
)
3363 tree decl
= grokdeclarator (parm
->declarator
, parm
->specs
, PARM
, false,
3366 decl_attributes (&decl
, parm
->attrs
, 0);
3371 /* Given a parsed parameter declaration, decode it into a PARM_DECL
3372 and push that on the current scope. */
3375 push_parm_decl (const struct c_parm
*parm
)
3379 decl
= grokdeclarator (parm
->declarator
, parm
->specs
, PARM
, false, NULL
);
3380 decl_attributes (&decl
, parm
->attrs
, 0);
3382 decl
= pushdecl (decl
);
3384 finish_decl (decl
, NULL_TREE
, NULL_TREE
);
3387 /* Mark all the parameter declarations to date as forward decls.
3388 Also diagnose use of this extension. */
3391 mark_forward_parm_decls (void)
3393 struct c_binding
*b
;
3395 if (pedantic
&& !current_scope
->warned_forward_parm_decls
)
3397 pedwarn ("ISO C forbids forward parameter declarations");
3398 current_scope
->warned_forward_parm_decls
= true;
3401 for (b
= current_scope
->bindings
; b
; b
= b
->prev
)
3402 if (TREE_CODE (b
->decl
) == PARM_DECL
)
3403 TREE_ASM_WRITTEN (b
->decl
) = 1;
3406 static GTY(()) int compound_literal_number
;
3408 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
3409 literal, which may be an incomplete array type completed by the
3410 initializer; INIT is a CONSTRUCTOR that initializes the compound
3414 build_compound_literal (tree type
, tree init
)
3416 /* We do not use start_decl here because we have a type, not a declarator;
3417 and do not use finish_decl because the decl should be stored inside
3418 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_EXPR. */
3419 tree decl
= build_decl (VAR_DECL
, NULL_TREE
, type
);
3422 DECL_EXTERNAL (decl
) = 0;
3423 TREE_PUBLIC (decl
) = 0;
3424 TREE_STATIC (decl
) = (current_scope
== file_scope
);
3425 DECL_CONTEXT (decl
) = current_function_decl
;
3426 TREE_USED (decl
) = 1;
3427 TREE_TYPE (decl
) = type
;
3428 TREE_READONLY (decl
) = TYPE_READONLY (type
);
3429 store_init_value (decl
, init
);
3431 if (TREE_CODE (type
) == ARRAY_TYPE
&& !COMPLETE_TYPE_P (type
))
3433 int failure
= complete_array_type (type
, DECL_INITIAL (decl
), 1);
3435 gcc_assert (!failure
);
3438 type
= TREE_TYPE (decl
);
3439 if (type
== error_mark_node
|| !COMPLETE_TYPE_P (type
))
3440 return error_mark_node
;
3442 stmt
= build_stmt (DECL_EXPR
, decl
);
3443 complit
= build1 (COMPOUND_LITERAL_EXPR
, TREE_TYPE (decl
), stmt
);
3444 TREE_SIDE_EFFECTS (complit
) = 1;
3446 layout_decl (decl
, 0);
3448 if (TREE_STATIC (decl
))
3450 /* This decl needs a name for the assembler output. We also need
3451 a unique suffix to be added to the name. */
3454 ASM_FORMAT_PRIVATE_NAME (name
, "__compound_literal",
3455 compound_literal_number
);
3456 compound_literal_number
++;
3457 DECL_NAME (decl
) = get_identifier (name
);
3458 DECL_DEFER_OUTPUT (decl
) = 1;
3459 DECL_COMDAT (decl
) = 1;
3460 DECL_ARTIFICIAL (decl
) = 1;
3462 rest_of_decl_compilation (decl
, 1, 0);
3468 /* Make TYPE a complete type based on INITIAL_VALUE.
3469 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3470 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3473 complete_array_type (tree type
, tree initial_value
, int do_default
)
3475 tree maxindex
= NULL_TREE
;
3480 /* Note MAXINDEX is really the maximum index,
3481 one less than the size. */
3482 if (TREE_CODE (initial_value
) == STRING_CST
)
3485 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value
)));
3486 maxindex
= build_int_cst (NULL_TREE
,
3487 (TREE_STRING_LENGTH (initial_value
)
3490 else if (TREE_CODE (initial_value
) == CONSTRUCTOR
)
3492 tree elts
= CONSTRUCTOR_ELTS (initial_value
);
3493 maxindex
= build_int_cst (NULL_TREE
, -1);
3494 for (; elts
; elts
= TREE_CHAIN (elts
))
3496 if (TREE_PURPOSE (elts
))
3497 maxindex
= TREE_PURPOSE (elts
);
3499 maxindex
= fold (build2 (PLUS_EXPR
, integer_type_node
,
3500 maxindex
, integer_one_node
));
3505 /* Make an error message unless that happened already. */
3506 if (initial_value
!= error_mark_node
)
3509 /* Prevent further error messages. */
3510 maxindex
= build_int_cst (NULL_TREE
, 0);
3517 maxindex
= build_int_cst (NULL_TREE
, 0);
3523 TYPE_DOMAIN (type
) = build_index_type (maxindex
);
3525 gcc_assert (TREE_TYPE (maxindex
));
3528 /* Lay out the type now that we can get the real answer. */
3535 /* Determine whether TYPE is a structure with a flexible array member,
3536 or a union containing such a structure (possibly recursively). */
3539 flexible_array_type_p (tree type
)
3542 switch (TREE_CODE (type
))
3545 x
= TYPE_FIELDS (type
);
3548 while (TREE_CHAIN (x
) != NULL_TREE
)
3550 if (TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
3551 && TYPE_SIZE (TREE_TYPE (x
)) == NULL_TREE
3552 && TYPE_DOMAIN (TREE_TYPE (x
)) != NULL_TREE
3553 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x
))) == NULL_TREE
)
3557 for (x
= TYPE_FIELDS (type
); x
!= NULL_TREE
; x
= TREE_CHAIN (x
))
3559 if (flexible_array_type_p (TREE_TYPE (x
)))
3568 /* Performs sanity checks on the TYPE and WIDTH of the bit-field NAME,
3569 replacing with appropriate values if they are invalid. */
3571 check_bitfield_type_and_width (tree
*type
, tree
*width
, const char *orig_name
)
3574 unsigned int max_width
;
3575 unsigned HOST_WIDE_INT w
;
3576 const char *name
= orig_name
? orig_name
: _("<anonymous>");
3579 STRIP_NOPS (*width
);
3581 /* Detect and ignore out of range field width and process valid
3583 if (TREE_CODE (*width
) != INTEGER_CST
)
3585 error ("bit-field %qs width not an integer constant", name
);
3586 *width
= integer_one_node
;
3590 constant_expression_warning (*width
);
3591 if (tree_int_cst_sgn (*width
) < 0)
3593 error ("negative width in bit-field %qs", name
);
3594 *width
= integer_one_node
;
3596 else if (integer_zerop (*width
) && orig_name
)
3598 error ("zero width for bit-field %qs", name
);
3599 *width
= integer_one_node
;
3603 /* Detect invalid bit-field type. */
3604 if (TREE_CODE (*type
) != INTEGER_TYPE
3605 && TREE_CODE (*type
) != BOOLEAN_TYPE
3606 && TREE_CODE (*type
) != ENUMERAL_TYPE
)
3608 error ("bit-field %qs has invalid type", name
);
3609 *type
= unsigned_type_node
;
3612 type_mv
= TYPE_MAIN_VARIANT (*type
);
3614 && type_mv
!= integer_type_node
3615 && type_mv
!= unsigned_type_node
3616 && type_mv
!= boolean_type_node
)
3617 pedwarn ("type of bit-field %qs is a GCC extension", name
);
3619 if (type_mv
== boolean_type_node
)
3620 max_width
= CHAR_TYPE_SIZE
;
3622 max_width
= TYPE_PRECISION (*type
);
3624 if (0 < compare_tree_int (*width
, max_width
))
3626 error ("width of %qs exceeds its type", name
);
3628 *width
= build_int_cst (NULL_TREE
, w
);
3631 w
= tree_low_cst (*width
, 1);
3633 if (TREE_CODE (*type
) == ENUMERAL_TYPE
)
3635 struct lang_type
*lt
= TYPE_LANG_SPECIFIC (*type
);
3637 || w
< min_precision (lt
->enum_min
, TYPE_UNSIGNED (*type
))
3638 || w
< min_precision (lt
->enum_max
, TYPE_UNSIGNED (*type
)))
3639 warning ("%qs is narrower than values of its type", name
);
3643 /* Given declspecs and a declarator,
3644 determine the name and type of the object declared
3645 and construct a ..._DECL node for it.
3646 (In one case we can return a ..._TYPE node instead.
3647 For invalid input we sometimes return 0.)
3649 DECLSPECS is a c_declspecs structure for the declaration specifiers.
3651 DECL_CONTEXT says which syntactic context this declaration is in:
3652 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3653 FUNCDEF for a function definition. Like NORMAL but a few different
3654 error messages in each case. Return value may be zero meaning
3655 this definition is too screwy to try to parse.
3656 PARM for a parameter declaration (either within a function prototype
3657 or before a function body). Make a PARM_DECL, or return void_type_node.
3658 TYPENAME if for a typename (in a cast or sizeof).
3659 Don't make a DECL node; just return the ..._TYPE node.
3660 FIELD for a struct or union field; make a FIELD_DECL.
3661 INITIALIZED is true if the decl has an initializer.
3662 WIDTH is non-NULL for bit-fields, and is a pointer to an INTEGER_CST node
3663 representing the width of the bit-field.
3665 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3666 It may also be so in the PARM case, for a prototype where the
3667 argument type is specified but not the name.
3669 This function is where the complicated C meanings of `static'
3670 and `extern' are interpreted. */
3673 grokdeclarator (const struct c_declarator
*declarator
,
3674 struct c_declspecs
*declspecs
,
3675 enum decl_context decl_context
, bool initialized
, tree
*width
)
3677 tree type
= declspecs
->type
;
3678 bool threadp
= declspecs
->thread_p
;
3679 enum c_storage_class storage_class
= declspecs
->storage_class
;
3683 int type_quals
= TYPE_UNQUALIFIED
;
3684 const char *name
, *orig_name
;
3685 tree typedef_type
= 0;
3686 int funcdef_flag
= 0;
3687 bool funcdef_syntax
= false;
3688 int size_varies
= 0;
3689 tree decl_attr
= declspecs
->decl_attr
;
3690 int array_ptr_quals
= TYPE_UNQUALIFIED
;
3691 tree array_ptr_attrs
= NULL_TREE
;
3692 int array_parm_static
= 0;
3693 tree returned_attrs
= NULL_TREE
;
3694 bool bitfield
= width
!= NULL
;
3696 struct c_arg_info
*arg_info
= 0;
3698 if (decl_context
== FUNCDEF
)
3699 funcdef_flag
= 1, decl_context
= NORMAL
;
3701 /* Look inside a declarator for the name being declared
3702 and get it as a string, for an error message. */
3704 const struct c_declarator
*decl
= declarator
;
3713 funcdef_syntax
= (decl
->kind
== cdk_function
);
3714 decl
= decl
->declarator
;
3718 decl
= decl
->declarator
;
3723 name
= IDENTIFIER_POINTER (decl
->u
.id
);
3735 /* A function definition's declarator must have the form of
3736 a function declarator. */
3738 if (funcdef_flag
&& !funcdef_syntax
)
3741 /* If this looks like a function definition, make it one,
3742 even if it occurs where parms are expected.
3743 Then store_parm_decls will reject it and not use it as a parm. */
3744 if (decl_context
== NORMAL
&& !funcdef_flag
&& current_scope
->parm_flag
)
3745 decl_context
= PARM
;
3747 if (declspecs
->deprecated_p
&& deprecated_state
!= DEPRECATED_SUPPRESS
)
3748 warn_deprecated_use (declspecs
->type
);
3750 typedef_type
= type
;
3751 size_varies
= C_TYPE_VARIABLE_SIZE (type
);
3753 /* Diagnose defaulting to "int". */
3755 if (declspecs
->default_int_p
&& !in_system_header
)
3757 /* Issue a warning if this is an ISO C 99 program or if
3758 -Wreturn-type and this is a function, or if -Wimplicit;
3759 prefer the former warning since it is more explicit. */
3760 if ((warn_implicit_int
|| warn_return_type
|| flag_isoc99
)
3762 warn_about_return_type
= 1;
3763 else if (warn_implicit_int
|| flag_isoc99
)
3764 pedwarn_c99 ("type defaults to %<int%> in declaration of %qs", name
);
3767 /* Adjust the type if a bit-field is being declared,
3768 -funsigned-bitfields applied and the type is not explicitly
3770 if (bitfield
&& !flag_signed_bitfields
&& !declspecs
->explicit_signed_p
3771 && TREE_CODE (type
) == INTEGER_TYPE
)
3772 type
= c_common_unsigned_type (type
);
3774 /* Check the type and width of a bit-field. */
3776 check_bitfield_type_and_width (&type
, width
, orig_name
);
3778 /* Figure out the type qualifiers for the declaration. There are
3779 two ways a declaration can become qualified. One is something
3780 like `const int i' where the `const' is explicit. Another is
3781 something like `typedef const int CI; CI i' where the type of the
3782 declaration contains the `const'. A third possibility is that
3783 there is a type qualifier on the element type of a typedefed
3784 array type, in which case we should extract that qualifier so
3785 that c_apply_type_quals_to_decls receives the full list of
3786 qualifiers to work with (C90 is not entirely clear about whether
3787 duplicate qualifiers should be diagnosed in this case, but it
3788 seems most appropriate to do so). */
3789 element_type
= strip_array_types (type
);
3790 constp
= declspecs
->const_p
+ TYPE_READONLY (element_type
);
3791 restrictp
= declspecs
->restrict_p
+ TYPE_RESTRICT (element_type
);
3792 volatilep
= declspecs
->volatile_p
+ TYPE_VOLATILE (element_type
);
3793 if (pedantic
&& !flag_isoc99
)
3796 pedwarn ("duplicate %<const%>");
3798 pedwarn ("duplicate %<restrict%>");
3800 pedwarn ("duplicate %<volatile%>");
3802 if (! flag_gen_aux_info
&& (TYPE_QUALS (type
)))
3803 type
= TYPE_MAIN_VARIANT (type
);
3804 type_quals
= ((constp
? TYPE_QUAL_CONST
: 0)
3805 | (restrictp
? TYPE_QUAL_RESTRICT
: 0)
3806 | (volatilep
? TYPE_QUAL_VOLATILE
: 0));
3808 /* Warn about storage classes that are invalid for certain
3809 kinds of declarations (parameters, typenames, etc.). */
3813 || storage_class
== csc_auto
3814 || storage_class
== csc_register
3815 || storage_class
== csc_typedef
))
3817 if (storage_class
== csc_auto
3818 && (pedantic
|| current_scope
== file_scope
))
3819 pedwarn ("function definition declared %<auto%>");
3820 if (storage_class
== csc_register
)
3821 error ("function definition declared %<register%>");
3822 if (storage_class
== csc_typedef
)
3823 error ("function definition declared %<typedef%>");
3825 error ("function definition declared %<__thread%>");
3827 if (storage_class
== csc_auto
3828 || storage_class
== csc_register
3829 || storage_class
== csc_typedef
)
3830 storage_class
= csc_none
;
3832 else if (decl_context
!= NORMAL
&& (storage_class
!= csc_none
|| threadp
))
3834 if (decl_context
== PARM
&& storage_class
== csc_register
)
3838 switch (decl_context
)
3841 error ("storage class specified for structure field %qs",
3845 error ("storage class specified for parameter %qs", name
);
3848 error ("storage class specified for typename");
3851 storage_class
= csc_none
;
3855 else if (storage_class
== csc_extern
3859 /* 'extern' with initialization is invalid if not at file scope. */
3860 if (current_scope
== file_scope
)
3861 warning ("%qs initialized and declared %<extern%>", name
);
3863 error ("%qs has both %<extern%> and initializer", name
);
3865 else if (current_scope
== file_scope
)
3867 if (storage_class
== csc_auto
)
3868 error ("file-scope declaration of %qs specifies %<auto%>", name
);
3869 if (pedantic
&& storage_class
== csc_register
)
3870 pedwarn ("file-scope declaration of %qs specifies %<register%>", name
);
3874 if (storage_class
== csc_extern
&& funcdef_flag
)
3875 error ("nested function %qs declared %<extern%>", name
);
3876 else if (threadp
&& storage_class
== csc_none
)
3878 error ("function-scope %qs implicitly auto and declared "
3885 /* Now figure out the structure of the declarator proper.
3886 Descend through it, creating more complex types, until we reach
3887 the declared identifier (or NULL_TREE, in an absolute declarator). */
3889 while (declarator
&& declarator
->kind
!= cdk_id
)
3891 if (type
== error_mark_node
)
3893 declarator
= declarator
->declarator
;
3897 /* Each level of DECLARATOR is either a cdk_array (for ...[..]),
3898 a cdk_pointer (for *...),
3899 a cdk_function (for ...(...)),
3900 a cdk_attrs (for nested attributes),
3901 or a cdk_id (for the name being declared
3902 or the place in an absolute declarator
3903 where the name was omitted).
3904 For the last case, we have just exited the loop.
3906 At this point, TYPE is the type of elements of an array,
3907 or for a function to return, or for a pointer to point to.
3908 After this sequence of ifs, TYPE is the type of the
3909 array or function or pointer, and DECLARATOR has had its
3910 outermost layer removed. */
3912 if (array_ptr_quals
!= TYPE_UNQUALIFIED
3913 || array_ptr_attrs
!= NULL_TREE
3914 || array_parm_static
)
3916 /* Only the innermost declarator (making a parameter be of
3917 array type which is converted to pointer type)
3918 may have static or type qualifiers. */
3919 error ("static or type qualifiers in non-parameter array declarator");
3920 array_ptr_quals
= TYPE_UNQUALIFIED
;
3921 array_ptr_attrs
= NULL_TREE
;
3922 array_parm_static
= 0;
3925 switch (declarator
->kind
)
3929 /* A declarator with embedded attributes. */
3930 tree attrs
= declarator
->u
.attrs
;
3931 const struct c_declarator
*inner_decl
;
3933 declarator
= declarator
->declarator
;
3934 inner_decl
= declarator
;
3935 while (inner_decl
->kind
== cdk_attrs
)
3936 inner_decl
= inner_decl
->declarator
;
3937 if (inner_decl
->kind
== cdk_id
)
3938 attr_flags
|= (int) ATTR_FLAG_DECL_NEXT
;
3939 else if (inner_decl
->kind
== cdk_function
)
3940 attr_flags
|= (int) ATTR_FLAG_FUNCTION_NEXT
;
3941 else if (inner_decl
->kind
== cdk_array
)
3942 attr_flags
|= (int) ATTR_FLAG_ARRAY_NEXT
;
3943 returned_attrs
= decl_attributes (&type
,
3944 chainon (returned_attrs
, attrs
),
3950 tree itype
= NULL_TREE
;
3951 tree size
= declarator
->u
.array
.dimen
;
3952 /* The index is a signed object `sizetype' bits wide. */
3953 tree index_type
= c_common_signed_type (sizetype
);
3955 array_ptr_quals
= declarator
->u
.array
.quals
;
3956 array_ptr_attrs
= declarator
->u
.array
.attrs
;
3957 array_parm_static
= declarator
->u
.array
.static_p
;
3959 declarator
= declarator
->declarator
;
3961 /* Check for some types that there cannot be arrays of. */
3963 if (VOID_TYPE_P (type
))
3965 error ("declaration of %qs as array of voids", name
);
3966 type
= error_mark_node
;
3969 if (TREE_CODE (type
) == FUNCTION_TYPE
)
3971 error ("declaration of %qs as array of functions", name
);
3972 type
= error_mark_node
;
3975 if (pedantic
&& !in_system_header
&& flexible_array_type_p (type
))
3976 pedwarn ("invalid use of structure with flexible array member");
3978 if (size
== error_mark_node
)
3979 type
= error_mark_node
;
3981 if (type
== error_mark_node
)
3984 /* If size was specified, set ITYPE to a range-type for
3985 that size. Otherwise, ITYPE remains null. finish_decl
3986 may figure it out from an initial value. */
3990 /* Strip NON_LVALUE_EXPRs since we aren't using as an
3992 STRIP_TYPE_NOPS (size
);
3994 if (! INTEGRAL_TYPE_P (TREE_TYPE (size
)))
3996 error ("size of array %qs has non-integer type", name
);
3997 size
= integer_one_node
;
4000 if (pedantic
&& integer_zerop (size
))
4001 pedwarn ("ISO C forbids zero-size array %qs", name
);
4003 if (TREE_CODE (size
) == INTEGER_CST
)
4005 constant_expression_warning (size
);
4006 if (tree_int_cst_sgn (size
) < 0)
4008 error ("size of array %qs is negative", name
);
4009 size
= integer_one_node
;
4014 /* Make sure the array size remains visibly
4015 nonconstant even if it is (eg) a const variable
4016 with known value. */
4019 if (!flag_isoc99
&& pedantic
)
4021 if (TREE_CONSTANT (size
))
4022 pedwarn ("ISO C90 forbids array %qs whose size "
4023 "can%'t be evaluated",
4026 pedwarn ("ISO C90 forbids variable-size array %qs",
4031 if (integer_zerop (size
))
4033 /* A zero-length array cannot be represented with
4034 an unsigned index type, which is what we'll
4035 get with build_index_type. Create an
4036 open-ended range instead. */
4037 itype
= build_range_type (sizetype
, size
, NULL_TREE
);
4041 /* Compute the maximum valid index, that is, size
4042 - 1. Do the calculation in index_type, so that
4043 if it is a variable the computations will be
4044 done in the proper mode. */
4045 itype
= fold (build2 (MINUS_EXPR
, index_type
,
4046 convert (index_type
, size
),
4047 convert (index_type
,
4050 /* If that overflowed, the array is too big. ???
4051 While a size of INT_MAX+1 technically shouldn't
4052 cause an overflow (because we subtract 1), the
4053 overflow is recorded during the conversion to
4054 index_type, before the subtraction. Handling
4055 this case seems like an unnecessary
4057 if (TREE_OVERFLOW (itype
))
4059 error ("size of array %qs is too large", name
);
4060 type
= error_mark_node
;
4065 itype
= variable_size (itype
);
4066 itype
= build_index_type (itype
);
4069 else if (decl_context
== FIELD
)
4071 if (pedantic
&& !flag_isoc99
&& !in_system_header
)
4072 pedwarn ("ISO C90 does not support flexible array members");
4074 /* ISO C99 Flexible array members are effectively
4075 identical to GCC's zero-length array extension. */
4076 itype
= build_range_type (sizetype
, size_zero_node
, NULL_TREE
);
4079 /* If pedantic, complain about arrays of incomplete types. */
4080 if (pedantic
&& !COMPLETE_TYPE_P (type
))
4081 pedwarn ("array type has incomplete element type");
4083 /* Build the array type itself, then merge any constancy
4084 or volatility into the target type. We must do it in
4085 this order to ensure that the TYPE_MAIN_VARIANT field
4086 of the array type is set correctly. */
4087 type
= build_array_type (type
, itype
);
4089 type
= c_build_qualified_type (type
, type_quals
);
4092 C_TYPE_VARIABLE_SIZE (type
) = 1;
4094 /* The GCC extension for zero-length arrays differs from
4095 ISO flexible array members in that sizeof yields
4097 if (size
&& integer_zerop (size
))
4100 TYPE_SIZE (type
) = bitsize_zero_node
;
4101 TYPE_SIZE_UNIT (type
) = size_zero_node
;
4103 else if (declarator
->kind
== cdk_pointer
)
4104 /* We can never complete an array type which is the
4105 target of a pointer, so go ahead and lay it out. */
4108 if (decl_context
!= PARM
4109 && (array_ptr_quals
!= TYPE_UNQUALIFIED
4110 || array_ptr_attrs
!= NULL_TREE
4111 || array_parm_static
))
4113 error ("static or type qualifiers in non-parameter array declarator");
4114 array_ptr_quals
= TYPE_UNQUALIFIED
;
4115 array_ptr_attrs
= NULL_TREE
;
4116 array_parm_static
= 0;
4122 /* Say it's a definition only for the declarator closest
4123 to the identifier, apart possibly from some
4125 bool really_funcdef
= false;
4129 const struct c_declarator
*t
= declarator
->declarator
;
4130 while (t
->kind
== cdk_attrs
)
4132 really_funcdef
= (t
->kind
== cdk_id
);
4135 /* Declaring a function type. Make sure we have a valid
4136 type for the function to return. */
4137 if (type
== error_mark_node
)
4142 /* Warn about some types functions can't return. */
4143 if (TREE_CODE (type
) == FUNCTION_TYPE
)
4145 error ("%qs declared as function returning a function", name
);
4146 type
= integer_type_node
;
4148 if (TREE_CODE (type
) == ARRAY_TYPE
)
4150 error ("%qs declared as function returning an array", name
);
4151 type
= integer_type_node
;
4154 /* Construct the function type and go to the next
4155 inner layer of declarator. */
4156 arg_info
= declarator
->u
.arg_info
;
4157 arg_types
= grokparms (arg_info
, really_funcdef
);
4159 /* Type qualifiers before the return type of the function
4160 qualify the return type, not the function type. */
4163 /* Type qualifiers on a function return type are
4164 normally permitted by the standard but have no
4165 effect, so give a warning at -Wreturn-type.
4166 Qualifiers on a void return type are banned on
4167 function definitions in ISO C; GCC used to used
4168 them for noreturn functions. */
4169 if (VOID_TYPE_P (type
) && really_funcdef
)
4170 pedwarn ("function definition has qualified void return type");
4171 else if (warn_return_type
)
4172 warning ("type qualifiers ignored on function return type");
4174 type
= c_build_qualified_type (type
, type_quals
);
4176 type_quals
= TYPE_UNQUALIFIED
;
4178 type
= build_function_type (type
, arg_types
);
4179 declarator
= declarator
->declarator
;
4181 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4182 the formal parameter list of this FUNCTION_TYPE to point to
4183 the FUNCTION_TYPE node itself. */
4187 for (link
= arg_info
->tags
;
4189 link
= TREE_CHAIN (link
))
4190 TYPE_CONTEXT (TREE_VALUE (link
)) = type
;
4196 /* Merge any constancy or volatility into the target type
4199 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
4201 pedwarn ("ISO C forbids qualified function types");
4203 type
= c_build_qualified_type (type
, type_quals
);
4206 type
= build_pointer_type (type
);
4208 /* Process type qualifiers (such as const or volatile)
4209 that were given inside the `*'. */
4210 type_quals
= declarator
->u
.pointer_quals
;
4212 declarator
= declarator
->declarator
;
4220 /* Now TYPE has the actual type. */
4222 /* Did array size calculations overflow? */
4224 if (TREE_CODE (type
) == ARRAY_TYPE
4225 && COMPLETE_TYPE_P (type
)
4226 && TREE_OVERFLOW (TYPE_SIZE (type
)))
4228 error ("size of array %qs is too large", name
);
4229 /* If we proceed with the array type as it is, we'll eventually
4230 crash in tree_low_cst(). */
4231 type
= error_mark_node
;
4234 /* If this is declaring a typedef name, return a TYPE_DECL. */
4236 if (storage_class
== csc_typedef
)
4239 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
4241 pedwarn ("ISO C forbids qualified function types");
4243 type
= c_build_qualified_type (type
, type_quals
);
4244 decl
= build_decl (TYPE_DECL
, declarator
->u
.id
, type
);
4245 if (declspecs
->explicit_signed_p
)
4246 C_TYPEDEF_EXPLICITLY_SIGNED (decl
) = 1;
4247 decl_attributes (&decl
, returned_attrs
, 0);
4248 if (declspecs
->inline_p
)
4249 pedwarn ("%Jtypedef %qD declared %<inline%>", decl
, decl
);
4253 /* Detect the case of an array type of unspecified size
4254 which came, as such, direct from a typedef name.
4255 We must copy the type, so that each identifier gets
4256 a distinct type, so that each identifier's size can be
4257 controlled separately by its own initializer. */
4259 if (type
!= 0 && typedef_type
!= 0
4260 && TREE_CODE (type
) == ARRAY_TYPE
&& TYPE_DOMAIN (type
) == 0
4261 && TYPE_MAIN_VARIANT (type
) == TYPE_MAIN_VARIANT (typedef_type
))
4263 type
= build_array_type (TREE_TYPE (type
), 0);
4265 C_TYPE_VARIABLE_SIZE (type
) = 1;
4268 /* If this is a type name (such as, in a cast or sizeof),
4269 compute the type and return it now. */
4271 if (decl_context
== TYPENAME
)
4273 /* Note that the grammar rejects storage classes in typenames
4275 gcc_assert (storage_class
== csc_none
&& !threadp
4276 && !declspecs
->inline_p
);
4277 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
4279 pedwarn ("ISO C forbids const or volatile function types");
4281 type
= c_build_qualified_type (type
, type_quals
);
4282 decl_attributes (&type
, returned_attrs
, 0);
4286 /* Aside from typedefs and type names (handle above),
4287 `void' at top level (not within pointer)
4288 is allowed only in public variables.
4289 We don't complain about parms either, but that is because
4290 a better error message can be made later. */
4292 if (VOID_TYPE_P (type
) && decl_context
!= PARM
4293 && ! ((decl_context
!= FIELD
&& TREE_CODE (type
) != FUNCTION_TYPE
)
4294 && (storage_class
== csc_extern
4295 || (current_scope
== file_scope
4296 && !(storage_class
== csc_static
4297 || storage_class
== csc_register
)))))
4299 error ("variable or field %qs declared void", name
);
4300 type
= integer_type_node
;
4303 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4304 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4309 if (decl_context
== PARM
)
4311 tree type_as_written
;
4314 /* A parameter declared as an array of T is really a pointer to T.
4315 One declared as a function is really a pointer to a function. */
4317 if (TREE_CODE (type
) == ARRAY_TYPE
)
4319 /* Transfer const-ness of array into that of type pointed to. */
4320 type
= TREE_TYPE (type
);
4322 type
= c_build_qualified_type (type
, type_quals
);
4323 type
= build_pointer_type (type
);
4324 type_quals
= array_ptr_quals
;
4326 /* We don't yet implement attributes in this context. */
4327 if (array_ptr_attrs
!= NULL_TREE
)
4328 warning ("attributes in parameter array declarator ignored");
4332 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
4334 if (pedantic
&& type_quals
)
4335 pedwarn ("ISO C forbids qualified function types");
4337 type
= c_build_qualified_type (type
, type_quals
);
4338 type
= build_pointer_type (type
);
4339 type_quals
= TYPE_UNQUALIFIED
;
4341 else if (type_quals
)
4342 type
= c_build_qualified_type (type
, type_quals
);
4344 type_as_written
= type
;
4346 decl
= build_decl (PARM_DECL
, declarator
->u
.id
, type
);
4348 C_DECL_VARIABLE_SIZE (decl
) = 1;
4350 /* Compute the type actually passed in the parmlist,
4351 for the case where there is no prototype.
4352 (For example, shorts and chars are passed as ints.)
4353 When there is a prototype, this is overridden later. */
4355 if (type
== error_mark_node
)
4356 promoted_type
= type
;
4358 promoted_type
= c_type_promotes_to (type
);
4360 DECL_ARG_TYPE (decl
) = promoted_type
;
4361 DECL_ARG_TYPE_AS_WRITTEN (decl
) = type_as_written
;
4362 if (declspecs
->inline_p
)
4363 pedwarn ("%Jparameter %qD declared %<inline%>", decl
, decl
);
4365 else if (decl_context
== FIELD
)
4367 /* Note that the grammar rejects storage classes in typenames
4369 gcc_assert (storage_class
== csc_none
&& !threadp
4370 && !declspecs
->inline_p
);
4372 /* Structure field. It may not be a function. */
4374 if (TREE_CODE (type
) == FUNCTION_TYPE
)
4376 error ("field %qs declared as a function", name
);
4377 type
= build_pointer_type (type
);
4379 else if (TREE_CODE (type
) != ERROR_MARK
4380 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type
))
4382 error ("field %qs has incomplete type", name
);
4383 type
= error_mark_node
;
4385 /* Move type qualifiers down to element of an array. */
4386 if (TREE_CODE (type
) == ARRAY_TYPE
&& type_quals
)
4387 type
= build_array_type (c_build_qualified_type (TREE_TYPE (type
),
4389 TYPE_DOMAIN (type
));
4390 decl
= build_decl (FIELD_DECL
, declarator
->u
.id
, type
);
4391 DECL_NONADDRESSABLE_P (decl
) = bitfield
;
4394 C_DECL_VARIABLE_SIZE (decl
) = 1;
4396 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
4398 if (storage_class
== csc_register
|| threadp
)
4399 error ("invalid storage class for function %qs", name
);
4400 else if (current_scope
!= file_scope
)
4402 /* Function declaration not at file scope. Storage
4403 classes other than `extern' are not allowed, C99
4404 6.7.1p5, and `extern' makes no difference. However,
4405 GCC allows 'auto', perhaps with 'inline', to support
4406 nested functions. */
4407 if (storage_class
== csc_auto
)
4410 pedwarn ("invalid storage class for function %qs", name
);
4412 if (storage_class
== csc_static
)
4413 error ("invalid storage class for function %qs", name
);
4416 decl
= build_decl (FUNCTION_DECL
, declarator
->u
.id
, type
);
4417 decl
= build_decl_attribute_variant (decl
, decl_attr
);
4419 DECL_LANG_SPECIFIC (decl
) = GGC_CNEW (struct lang_decl
);
4421 if (pedantic
&& type_quals
&& ! DECL_IN_SYSTEM_HEADER (decl
))
4422 pedwarn ("ISO C forbids qualified function types");
4424 /* GNU C interprets a volatile-qualified function type to indicate
4425 that the function does not return. */
4426 if ((type_quals
& TYPE_QUAL_VOLATILE
)
4427 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl
))))
4428 warning ("%<noreturn%> function returns non-void value");
4430 /* Every function declaration is an external reference
4431 (DECL_EXTERNAL) except for those which are not at file
4432 scope and are explicitly declared "auto". This is
4433 forbidden by standard C (C99 6.7.1p5) and is interpreted by
4434 GCC to signify a forward declaration of a nested function. */
4435 if (storage_class
== csc_auto
&& current_scope
!= file_scope
)
4436 DECL_EXTERNAL (decl
) = 0;
4438 DECL_EXTERNAL (decl
) = 1;
4440 /* Record absence of global scope for `static' or `auto'. */
4442 = !(storage_class
== csc_static
|| storage_class
== csc_auto
);
4444 /* For a function definition, record the argument information
4445 block where store_parm_decls will look for it. */
4447 current_function_arg_info
= arg_info
;
4449 if (declspecs
->default_int_p
)
4450 C_FUNCTION_IMPLICIT_INT (decl
) = 1;
4452 /* Record presence of `inline', if it is reasonable. */
4453 if (flag_hosted
&& MAIN_NAME_P (declarator
->u
.id
))
4455 if (declspecs
->inline_p
)
4456 pedwarn ("cannot inline function %<main%>");
4458 else if (declspecs
->inline_p
)
4460 /* Record that the function is declared `inline'. */
4461 DECL_DECLARED_INLINE_P (decl
) = 1;
4463 /* Do not mark bare declarations as DECL_INLINE. Doing so
4464 in the presence of multiple declarations can result in
4465 the abstract origin pointing between the declarations,
4466 which will confuse dwarf2out. */
4469 DECL_INLINE (decl
) = 1;
4470 if (storage_class
== csc_extern
)
4471 current_extern_inline
= 1;
4474 /* If -finline-functions, assume it can be inlined. This does
4475 two things: let the function be deferred until it is actually
4476 needed, and let dwarf2 know that the function is inlinable. */
4477 else if (flag_inline_trees
== 2 && initialized
)
4478 DECL_INLINE (decl
) = 1;
4482 /* It's a variable. */
4483 /* An uninitialized decl with `extern' is a reference. */
4484 int extern_ref
= !initialized
&& storage_class
== csc_extern
;
4486 /* Move type qualifiers down to element of an array. */
4487 if (TREE_CODE (type
) == ARRAY_TYPE
&& type_quals
)
4489 int saved_align
= TYPE_ALIGN(type
);
4490 type
= build_array_type (c_build_qualified_type (TREE_TYPE (type
),
4492 TYPE_DOMAIN (type
));
4493 TYPE_ALIGN (type
) = saved_align
;
4495 else if (type_quals
)
4496 type
= c_build_qualified_type (type
, type_quals
);
4498 /* C99 6.2.2p7: It is invalid (compile-time undefined
4499 behavior) to create an 'extern' declaration for a
4500 variable if there is a global declaration that is
4501 'static' and the global declaration is not visible.
4502 (If the static declaration _is_ currently visible,
4503 the 'extern' declaration is taken to refer to that decl.) */
4504 if (extern_ref
&& current_scope
!= file_scope
)
4506 tree global_decl
= identifier_global_value (declarator
->u
.id
);
4507 tree visible_decl
= lookup_name (declarator
->u
.id
);
4510 && global_decl
!= visible_decl
4511 && TREE_CODE (global_decl
) == VAR_DECL
4512 && !TREE_PUBLIC (global_decl
))
4513 error ("variable previously declared %<static%> redeclared "
4517 decl
= build_decl (VAR_DECL
, declarator
->u
.id
, type
);
4519 C_DECL_VARIABLE_SIZE (decl
) = 1;
4521 if (declspecs
->inline_p
)
4522 pedwarn ("%Jvariable %qD declared %<inline%>", decl
, decl
);
4524 /* At file scope, an initialized extern declaration may follow
4525 a static declaration. In that case, DECL_EXTERNAL will be
4526 reset later in start_decl. */
4527 DECL_EXTERNAL (decl
) = (storage_class
== csc_extern
);
4529 /* At file scope, the presence of a `static' or `register' storage
4530 class specifier, or the absence of all storage class specifiers
4531 makes this declaration a definition (perhaps tentative). Also,
4532 the absence of both `static' and `register' makes it public. */
4533 if (current_scope
== file_scope
)
4535 TREE_PUBLIC (decl
) = !(storage_class
== csc_static
4536 || storage_class
== csc_register
);
4537 TREE_STATIC (decl
) = !extern_ref
;
4539 /* Not at file scope, only `static' makes a static definition. */
4542 TREE_STATIC (decl
) = (storage_class
== csc_static
);
4543 TREE_PUBLIC (decl
) = extern_ref
;
4548 if (targetm
.have_tls
)
4549 DECL_THREAD_LOCAL (decl
) = 1;
4551 /* A mere warning is sure to result in improper semantics
4552 at runtime. Don't bother to allow this to compile. */
4553 error ("thread-local storage not supported for this target");
4557 /* Record `register' declaration for warnings on &
4558 and in case doing stupid register allocation. */
4560 if (storage_class
== csc_register
)
4562 C_DECL_REGISTER (decl
) = 1;
4563 DECL_REGISTER (decl
) = 1;
4566 /* Record constancy and volatility. */
4567 c_apply_type_quals_to_decl (type_quals
, decl
);
4569 /* If a type has volatile components, it should be stored in memory.
4570 Otherwise, the fact that those components are volatile
4571 will be ignored, and would even crash the compiler. */
4572 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl
)))
4574 /* It is not an error for a structure with volatile fields to
4575 be declared register, but reset DECL_REGISTER since it
4576 cannot actually go in a register. */
4577 int was_reg
= C_DECL_REGISTER (decl
);
4578 C_DECL_REGISTER (decl
) = 0;
4579 DECL_REGISTER (decl
) = 0;
4580 c_mark_addressable (decl
);
4581 C_DECL_REGISTER (decl
) = was_reg
;
4584 /* This is the earliest point at which we might know the assembler
4585 name of a variable. Thus, if it's known before this, die horribly. */
4586 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl
));
4588 decl_attributes (&decl
, returned_attrs
, 0);
4594 /* Decode the parameter-list info for a function type or function definition.
4595 The argument is the value returned by `get_parm_info' (or made in parse.y
4596 if there is an identifier list instead of a parameter decl list).
4597 These two functions are separate because when a function returns
4598 or receives functions then each is called multiple times but the order
4599 of calls is different. The last call to `grokparms' is always the one
4600 that contains the formal parameter names of a function definition.
4602 Return a list of arg types to use in the FUNCTION_TYPE for this function.
4604 FUNCDEF_FLAG is true for a function definition, false for
4605 a mere declaration. A nonempty identifier-list gets an error message
4606 when FUNCDEF_FLAG is false. */
4609 grokparms (struct c_arg_info
*arg_info
, bool funcdef_flag
)
4611 tree arg_types
= arg_info
->types
;
4613 if (warn_strict_prototypes
&& arg_types
== 0 && !funcdef_flag
4614 && !in_system_header
)
4615 warning ("function declaration isn%'t a prototype");
4617 if (arg_types
== error_mark_node
)
4618 return 0; /* don't set TYPE_ARG_TYPES in this case */
4620 else if (arg_types
&& TREE_CODE (TREE_VALUE (arg_types
)) == IDENTIFIER_NODE
)
4623 pedwarn ("parameter names (without types) in function declaration");
4625 arg_info
->parms
= arg_info
->types
;
4626 arg_info
->types
= 0;
4631 tree parm
, type
, typelt
;
4632 unsigned int parmno
;
4634 /* If the arg types are incomplete in a declaration, they must
4635 include undefined tags. These tags can never be defined in
4636 the scope of the declaration, so the types can never be
4637 completed, and no call can be compiled successfully. */
4639 for (parm
= arg_info
->parms
, typelt
= arg_types
, parmno
= 1;
4641 parm
= TREE_CHAIN (parm
), typelt
= TREE_CHAIN (typelt
), parmno
++)
4643 type
= TREE_VALUE (typelt
);
4644 if (type
== error_mark_node
)
4647 if (!COMPLETE_TYPE_P (type
))
4651 if (DECL_NAME (parm
))
4652 error ("%Jparameter %u (%qD) has incomplete type",
4653 parm
, parmno
, parm
);
4655 error ("%Jparameter %u has incomplete type",
4658 TREE_VALUE (typelt
) = error_mark_node
;
4659 TREE_TYPE (parm
) = error_mark_node
;
4663 if (DECL_NAME (parm
))
4664 warning ("%Jparameter %u (%qD) has incomplete type",
4665 parm
, parmno
, parm
);
4667 warning ("%Jparameter %u has incomplete type",
4676 /* Take apart the current scope and return a c_arg_info structure with
4677 info on a parameter list just parsed.
4679 This structure is later fed to 'grokparms' and 'store_parm_decls'.
4681 ELLIPSIS being true means the argument list ended in '...' so don't
4682 append a sentinel (void_list_node) to the end of the type-list. */
4685 get_parm_info (bool ellipsis
)
4687 struct c_binding
*b
= current_scope
->bindings
;
4688 struct c_arg_info
*arg_info
= XOBNEW (&parser_obstack
,
4695 static bool explained_incomplete_types
= false;
4696 bool gave_void_only_once_err
= false;
4698 arg_info
->parms
= 0;
4700 arg_info
->types
= 0;
4701 arg_info
->others
= 0;
4703 /* The bindings in this scope must not get put into a block.
4704 We will take care of deleting the binding nodes. */
4705 current_scope
->bindings
= 0;
4707 /* This function is only called if there was *something* on the
4711 /* A parameter list consisting solely of 'void' indicates that the
4712 function takes no arguments. But if the 'void' is qualified
4713 (by 'const' or 'volatile'), or has a storage class specifier
4714 ('register'), then the behavior is undefined; issue an error.
4715 Typedefs for 'void' are OK (see DR#157). */
4716 if (b
->prev
== 0 /* one binding */
4717 && TREE_CODE (b
->decl
) == PARM_DECL
/* which is a parameter */
4718 && !DECL_NAME (b
->decl
) /* anonymous */
4719 && VOID_TYPE_P (TREE_TYPE (b
->decl
))) /* of void type */
4721 if (TREE_THIS_VOLATILE (b
->decl
)
4722 || TREE_READONLY (b
->decl
)
4723 || C_DECL_REGISTER (b
->decl
))
4724 error ("%<void%> as only parameter may not be qualified");
4726 /* There cannot be an ellipsis. */
4728 error ("%<void%> must be the only parameter");
4730 arg_info
->types
= void_list_node
;
4735 types
= void_list_node
;
4737 /* Break up the bindings list into parms, tags, types, and others;
4738 apply sanity checks; purge the name-to-decl bindings. */
4741 tree decl
= b
->decl
;
4742 tree type
= TREE_TYPE (decl
);
4743 const char *keyword
;
4745 switch (TREE_CODE (decl
))
4750 gcc_assert (I_SYMBOL_BINDING (b
->id
) == b
);
4751 I_SYMBOL_BINDING (b
->id
) = b
->shadowed
;
4754 /* Check for forward decls that never got their actual decl. */
4755 if (TREE_ASM_WRITTEN (decl
))
4756 error ("%Jparameter %qD has just a forward declaration",
4758 /* Check for (..., void, ...) and issue an error. */
4759 else if (VOID_TYPE_P (type
) && !DECL_NAME (decl
))
4761 if (!gave_void_only_once_err
)
4763 error ("%<void%> must be the only parameter");
4764 gave_void_only_once_err
= true;
4769 /* Valid parameter, add it to the list. */
4770 TREE_CHAIN (decl
) = parms
;
4773 /* Since there is a prototype, args are passed in their
4774 declared types. The back end may override this later. */
4775 DECL_ARG_TYPE (decl
) = type
;
4776 types
= tree_cons (0, type
, types
);
4780 case ENUMERAL_TYPE
: keyword
= "enum"; goto tag
;
4781 case UNION_TYPE
: keyword
= "union"; goto tag
;
4782 case RECORD_TYPE
: keyword
= "struct"; goto tag
;
4784 /* Types may not have tag-names, in which case the type
4785 appears in the bindings list with b->id NULL. */
4788 gcc_assert (I_TAG_BINDING (b
->id
) == b
);
4789 I_TAG_BINDING (b
->id
) = b
->shadowed
;
4792 /* Warn about any struct, union or enum tags defined in a
4793 parameter list. The scope of such types is limited to
4794 the parameter list, which is rarely if ever desirable
4795 (it's impossible to call such a function with type-
4796 correct arguments). An anonymous union parm type is
4797 meaningful as a GNU extension, so don't warn for that. */
4798 if (TREE_CODE (decl
) != UNION_TYPE
|| b
->id
!= 0)
4801 /* The %s will be one of 'struct', 'union', or 'enum'. */
4802 warning ("%<%s %E%> declared inside parameter list",
4805 /* The %s will be one of 'struct', 'union', or 'enum'. */
4806 warning ("anonymous %s declared inside parameter list",
4809 if (! explained_incomplete_types
)
4811 warning ("its scope is only this definition or declaration,"
4812 " which is probably not what you want");
4813 explained_incomplete_types
= true;
4817 tags
= tree_cons (b
->id
, decl
, tags
);
4822 /* CONST_DECLs appear here when we have an embedded enum,
4823 and TYPE_DECLs appear here when we have an embedded struct
4824 or union. No warnings for this - we already warned about the
4826 TREE_CHAIN (decl
) = others
;
4831 /* error_mark_node appears here when we have an undeclared
4832 variable. Just throw it away. */
4835 gcc_assert (I_SYMBOL_BINDING (b
->id
) == b
);
4836 I_SYMBOL_BINDING (b
->id
) = b
->shadowed
;
4840 /* Other things that might be encountered. */
4848 b
= free_binding_and_advance (b
);
4851 arg_info
->parms
= parms
;
4852 arg_info
->tags
= tags
;
4853 arg_info
->types
= types
;
4854 arg_info
->others
= others
;
4858 /* Get the struct, enum or union (CODE says which) with tag NAME.
4859 Define the tag as a forward-reference if it is not defined. */
4862 xref_tag (enum tree_code code
, tree name
)
4864 /* If a cross reference is requested, look up the type
4865 already defined for this tag and return it. */
4867 tree ref
= lookup_tag (code
, name
, 0);
4868 /* If this is the right type of tag, return what we found.
4869 (This reference will be shadowed by shadow_tag later if appropriate.)
4870 If this is the wrong type of tag, do not return it. If it was the
4871 wrong type in the same scope, we will have had an error
4872 message already; if in a different scope and declaring
4873 a name, pending_xref_error will give an error message; but if in a
4874 different scope and not declaring a name, this tag should
4875 shadow the previous declaration of a different type of tag, and
4876 this would not work properly if we return the reference found.
4877 (For example, with "struct foo" in an outer scope, "union foo;"
4878 must shadow that tag with a new one of union type.) */
4879 if (ref
&& TREE_CODE (ref
) == code
)
4882 /* If no such tag is yet defined, create a forward-reference node
4883 and record it as the "definition".
4884 When a real declaration of this type is found,
4885 the forward-reference will be altered into a real type. */
4887 ref
= make_node (code
);
4888 if (code
== ENUMERAL_TYPE
)
4890 /* Give the type a default layout like unsigned int
4891 to avoid crashing if it does not get defined. */
4892 TYPE_MODE (ref
) = TYPE_MODE (unsigned_type_node
);
4893 TYPE_ALIGN (ref
) = TYPE_ALIGN (unsigned_type_node
);
4894 TYPE_USER_ALIGN (ref
) = 0;
4895 TYPE_UNSIGNED (ref
) = 1;
4896 TYPE_PRECISION (ref
) = TYPE_PRECISION (unsigned_type_node
);
4897 TYPE_MIN_VALUE (ref
) = TYPE_MIN_VALUE (unsigned_type_node
);
4898 TYPE_MAX_VALUE (ref
) = TYPE_MAX_VALUE (unsigned_type_node
);
4901 pushtag (name
, ref
);
4906 /* Make sure that the tag NAME is defined *in the current scope*
4907 at least as a forward reference.
4908 CODE says which kind of tag NAME ought to be. */
4911 start_struct (enum tree_code code
, tree name
)
4913 /* If there is already a tag defined at this scope
4914 (as a forward reference), just return it. */
4919 ref
= lookup_tag (code
, name
, 1);
4920 if (ref
&& TREE_CODE (ref
) == code
)
4922 if (TYPE_SIZE (ref
))
4924 if (code
== UNION_TYPE
)
4925 error ("redefinition of %<union %s%>", IDENTIFIER_POINTER (name
));
4927 error ("redefinition of %<struct %s%>", IDENTIFIER_POINTER (name
));
4929 else if (C_TYPE_BEING_DEFINED (ref
))
4931 if (code
== UNION_TYPE
)
4932 error ("nested redefinition of %<union %s%>",
4933 IDENTIFIER_POINTER (name
));
4935 error ("nested redefinition of %<struct %s%>",
4936 IDENTIFIER_POINTER (name
));
4941 /* Otherwise create a forward-reference just so the tag is in scope. */
4943 ref
= make_node (code
);
4944 pushtag (name
, ref
);
4947 C_TYPE_BEING_DEFINED (ref
) = 1;
4948 TYPE_PACKED (ref
) = flag_pack_struct
;
4952 /* Process the specs, declarator and width (NULL if omitted)
4953 of a structure component, returning a FIELD_DECL node.
4954 WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node.
4956 This is done during the parsing of the struct declaration.
4957 The FIELD_DECL nodes are chained together and the lot of them
4958 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
4961 grokfield (struct c_declarator
*declarator
, struct c_declspecs
*declspecs
,
4966 if (declarator
->kind
== cdk_id
&& declarator
->u
.id
== NULL_TREE
4967 && width
== NULL_TREE
)
4969 /* This is an unnamed decl.
4971 If we have something of the form "union { list } ;" then this
4972 is the anonymous union extension. Similarly for struct.
4974 If this is something of the form "struct foo;", then
4975 If MS extensions are enabled, this is handled as an
4977 Otherwise this is a forward declaration of a structure tag.
4979 If this is something of the form "foo;" and foo is a TYPE_DECL, then
4980 If MS extensions are enabled and foo names a structure, then
4981 again this is an anonymous struct.
4982 Otherwise this is an error.
4984 Oh what a horrid tangled web we weave. I wonder if MS consciously
4985 took this from Plan 9 or if it was an accident of implementation
4986 that took root before someone noticed the bug... */
4988 tree type
= declspecs
->type
;
4991 && (TREE_CODE (type
) == RECORD_TYPE
4992 || TREE_CODE (type
) == UNION_TYPE
)
4993 && (flag_ms_extensions
|| !declspecs
->typedef_p
))
4995 if (flag_ms_extensions
)
4998 goto warn_unnamed_field
;
4999 else if (TYPE_NAME (type
) == NULL
)
5002 goto warn_unnamed_field
;
5007 warning ("declaration does not declare anything");
5012 value
= grokdeclarator (declarator
, declspecs
, FIELD
, false,
5013 width
? &width
: NULL
);
5015 finish_decl (value
, NULL_TREE
, NULL_TREE
);
5016 DECL_INITIAL (value
) = width
;
5021 /* Generate an error for any duplicate field names in FIELDLIST. Munge
5022 the list such that this does not present a problem later. */
5025 detect_field_duplicates (tree fieldlist
)
5030 /* First, see if there are more than "a few" fields.
5031 This is trivially true if there are zero or one fields. */
5034 x
= TREE_CHAIN (fieldlist
);
5040 } while (timeout
> 0 && x
);
5042 /* If there were "few" fields, avoid the overhead of allocating
5043 a hash table. Instead just do the nested traversal thing. */
5046 for (x
= TREE_CHAIN (fieldlist
); x
; x
= TREE_CHAIN (x
))
5049 for (y
= fieldlist
; y
!= x
; y
= TREE_CHAIN (y
))
5050 if (DECL_NAME (y
) == DECL_NAME (x
))
5052 error ("%Jduplicate member %qD", x
, x
);
5053 DECL_NAME (x
) = NULL_TREE
;
5059 htab_t htab
= htab_create (37, htab_hash_pointer
, htab_eq_pointer
, NULL
);
5062 for (x
= fieldlist
; x
; x
= TREE_CHAIN (x
))
5063 if ((y
= DECL_NAME (x
)) != 0)
5065 slot
= htab_find_slot (htab
, y
, INSERT
);
5068 error ("%Jduplicate member %qD", x
, x
);
5069 DECL_NAME (x
) = NULL_TREE
;
5078 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5079 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5080 ATTRIBUTES are attributes to be applied to the structure. */
5083 finish_struct (tree t
, tree fieldlist
, tree attributes
)
5086 bool toplevel
= file_scope
== current_scope
;
5087 int saw_named_field
;
5089 /* If this type was previously laid out as a forward reference,
5090 make sure we lay it out again. */
5094 decl_attributes (&t
, attributes
, (int) ATTR_FLAG_TYPE_IN_PLACE
);
5098 for (x
= fieldlist
; x
; x
= TREE_CHAIN (x
))
5099 if (DECL_NAME (x
) != 0)
5103 pedwarn ("%s has no %s",
5104 TREE_CODE (t
) == UNION_TYPE
? _("union") : _("struct"),
5105 fieldlist
? _("named members") : _("members"));
5108 /* Install struct as DECL_CONTEXT of each field decl.
5109 Also process specified field sizes, found in the DECL_INITIAL,
5110 storing 0 there after the type has been changed to precision equal
5111 to its width, rather than the precision of the specified standard
5112 type. (Correct layout requires the original type to have been preserved
5115 saw_named_field
= 0;
5116 for (x
= fieldlist
; x
; x
= TREE_CHAIN (x
))
5118 DECL_CONTEXT (x
) = t
;
5119 DECL_PACKED (x
) |= TYPE_PACKED (t
);
5121 /* If any field is const, the structure type is pseudo-const. */
5122 if (TREE_READONLY (x
))
5123 C_TYPE_FIELDS_READONLY (t
) = 1;
5126 /* A field that is pseudo-const makes the structure likewise. */
5127 tree t1
= TREE_TYPE (x
);
5128 while (TREE_CODE (t1
) == ARRAY_TYPE
)
5129 t1
= TREE_TYPE (t1
);
5130 if ((TREE_CODE (t1
) == RECORD_TYPE
|| TREE_CODE (t1
) == UNION_TYPE
)
5131 && C_TYPE_FIELDS_READONLY (t1
))
5132 C_TYPE_FIELDS_READONLY (t
) = 1;
5135 /* Any field that is volatile means variables of this type must be
5136 treated in some ways as volatile. */
5137 if (TREE_THIS_VOLATILE (x
))
5138 C_TYPE_FIELDS_VOLATILE (t
) = 1;
5140 /* Any field of nominal variable size implies structure is too. */
5141 if (C_DECL_VARIABLE_SIZE (x
))
5142 C_TYPE_VARIABLE_SIZE (t
) = 1;
5144 if (DECL_INITIAL (x
))
5146 unsigned HOST_WIDE_INT width
= tree_low_cst (DECL_INITIAL (x
), 1);
5147 DECL_SIZE (x
) = bitsize_int (width
);
5148 DECL_BIT_FIELD (x
) = 1;
5149 SET_DECL_C_BIT_FIELD (x
);
5152 /* Detect flexible array member in an invalid context. */
5153 if (TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
5154 && TYPE_SIZE (TREE_TYPE (x
)) == NULL_TREE
5155 && TYPE_DOMAIN (TREE_TYPE (x
)) != NULL_TREE
5156 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x
))) == NULL_TREE
)
5158 if (TREE_CODE (t
) == UNION_TYPE
)
5160 error ("%Jflexible array member in union", x
);
5161 TREE_TYPE (x
) = error_mark_node
;
5163 else if (TREE_CHAIN (x
) != NULL_TREE
)
5165 error ("%Jflexible array member not at end of struct", x
);
5166 TREE_TYPE (x
) = error_mark_node
;
5168 else if (! saw_named_field
)
5170 error ("%Jflexible array member in otherwise empty struct", x
);
5171 TREE_TYPE (x
) = error_mark_node
;
5175 if (pedantic
&& !in_system_header
&& TREE_CODE (t
) == RECORD_TYPE
5176 && flexible_array_type_p (TREE_TYPE (x
)))
5177 pedwarn ("%Jinvalid use of structure with flexible array member", x
);
5180 saw_named_field
= 1;
5183 detect_field_duplicates (fieldlist
);
5185 /* Now we have the nearly final fieldlist. Record it,
5186 then lay out the structure or union (including the fields). */
5188 TYPE_FIELDS (t
) = fieldlist
;
5192 /* Give bit-fields their proper types. */
5194 tree
*fieldlistp
= &fieldlist
;
5196 if (TREE_CODE (*fieldlistp
) == FIELD_DECL
&& DECL_INITIAL (*fieldlistp
)
5197 && TREE_TYPE (*fieldlistp
) != error_mark_node
)
5199 unsigned HOST_WIDE_INT width
5200 = tree_low_cst (DECL_INITIAL (*fieldlistp
), 1);
5201 tree type
= TREE_TYPE (*fieldlistp
);
5202 if (width
!= TYPE_PRECISION (type
))
5203 TREE_TYPE (*fieldlistp
)
5204 = build_nonstandard_integer_type (width
, TYPE_UNSIGNED (type
));
5205 DECL_INITIAL (*fieldlistp
) = 0;
5208 fieldlistp
= &TREE_CHAIN (*fieldlistp
);
5211 /* Now we have the truly final field list.
5212 Store it in this type and in the variants. */
5214 TYPE_FIELDS (t
) = fieldlist
;
5216 /* If there are lots of fields, sort so we can look through them fast.
5217 We arbitrarily consider 16 or more elts to be "a lot". */
5222 for (x
= fieldlist
; x
; x
= TREE_CHAIN (x
))
5224 if (len
> 15 || DECL_NAME (x
) == NULL
)
5232 struct lang_type
*space
;
5233 struct sorted_fields_type
*space2
;
5235 len
+= list_length (x
);
5237 /* Use the same allocation policy here that make_node uses, to
5238 ensure that this lives as long as the rest of the struct decl.
5239 All decls in an inline function need to be saved. */
5241 space
= GGC_CNEW (struct lang_type
);
5242 space2
= GGC_NEWVAR (struct sorted_fields_type
,
5243 sizeof (struct sorted_fields_type
) + len
* sizeof (tree
));
5247 field_array
= &space2
->elts
[0];
5248 for (x
= fieldlist
; x
; x
= TREE_CHAIN (x
))
5250 field_array
[len
++] = x
;
5252 /* If there is anonymous struct or union, break out of the loop. */
5253 if (DECL_NAME (x
) == NULL
)
5256 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
5259 TYPE_LANG_SPECIFIC (t
) = space
;
5260 TYPE_LANG_SPECIFIC (t
)->s
->len
= len
;
5261 field_array
= TYPE_LANG_SPECIFIC (t
)->s
->elts
;
5262 qsort (field_array
, len
, sizeof (tree
), field_decl_cmp
);
5267 for (x
= TYPE_MAIN_VARIANT (t
); x
; x
= TYPE_NEXT_VARIANT (x
))
5269 TYPE_FIELDS (x
) = TYPE_FIELDS (t
);
5270 TYPE_LANG_SPECIFIC (x
) = TYPE_LANG_SPECIFIC (t
);
5271 TYPE_ALIGN (x
) = TYPE_ALIGN (t
);
5272 TYPE_USER_ALIGN (x
) = TYPE_USER_ALIGN (t
);
5275 /* If this was supposed to be a transparent union, but we can't
5276 make it one, warn and turn off the flag. */
5277 if (TREE_CODE (t
) == UNION_TYPE
5278 && TYPE_TRANSPARENT_UNION (t
)
5279 && TYPE_MODE (t
) != DECL_MODE (TYPE_FIELDS (t
)))
5281 TYPE_TRANSPARENT_UNION (t
) = 0;
5282 warning ("union cannot be made transparent");
5285 /* If this structure or union completes the type of any previous
5286 variable declaration, lay it out and output its rtl. */
5287 for (x
= C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t
));
5291 tree decl
= TREE_VALUE (x
);
5292 if (TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
)
5293 layout_array_type (TREE_TYPE (decl
));
5294 if (TREE_CODE (decl
) != TYPE_DECL
)
5296 layout_decl (decl
, 0);
5297 if (c_dialect_objc ())
5298 objc_check_decl (decl
);
5299 rest_of_decl_compilation (decl
, toplevel
, 0);
5304 C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t
)) = 0;
5306 /* Finish debugging output for this type. */
5307 rest_of_type_compilation (t
, toplevel
);
5312 /* Lay out the type T, and its element type, and so on. */
5315 layout_array_type (tree t
)
5317 if (TREE_CODE (TREE_TYPE (t
)) == ARRAY_TYPE
)
5318 layout_array_type (TREE_TYPE (t
));
5322 /* Begin compiling the definition of an enumeration type.
5323 NAME is its name (or null if anonymous).
5324 Returns the type object, as yet incomplete.
5325 Also records info about it so that build_enumerator
5326 may be used to declare the individual values as they are read. */
5329 start_enum (tree name
)
5333 /* If this is the real definition for a previous forward reference,
5334 fill in the contents in the same object that used to be the
5335 forward reference. */
5338 enumtype
= lookup_tag (ENUMERAL_TYPE
, name
, 1);
5340 if (enumtype
== 0 || TREE_CODE (enumtype
) != ENUMERAL_TYPE
)
5342 enumtype
= make_node (ENUMERAL_TYPE
);
5343 pushtag (name
, enumtype
);
5346 if (C_TYPE_BEING_DEFINED (enumtype
))
5347 error ("nested redefinition of %<enum %s%>", IDENTIFIER_POINTER (name
));
5349 C_TYPE_BEING_DEFINED (enumtype
) = 1;
5351 if (TYPE_VALUES (enumtype
) != 0)
5353 /* This enum is a named one that has been declared already. */
5354 error ("redeclaration of %<enum %s%>", IDENTIFIER_POINTER (name
));
5356 /* Completely replace its old definition.
5357 The old enumerators remain defined, however. */
5358 TYPE_VALUES (enumtype
) = 0;
5361 enum_next_value
= integer_zero_node
;
5364 if (flag_short_enums
)
5365 TYPE_PACKED (enumtype
) = 1;
5370 /* After processing and defining all the values of an enumeration type,
5371 install their decls in the enumeration type and finish it off.
5372 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5373 and ATTRIBUTES are the specified attributes.
5374 Returns ENUMTYPE. */
5377 finish_enum (tree enumtype
, tree values
, tree attributes
)
5380 tree minnode
= 0, maxnode
= 0;
5381 int precision
, unsign
;
5382 bool toplevel
= (file_scope
== current_scope
);
5383 struct lang_type
*lt
;
5385 decl_attributes (&enumtype
, attributes
, (int) ATTR_FLAG_TYPE_IN_PLACE
);
5387 /* Calculate the maximum value of any enumerator in this type. */
5389 if (values
== error_mark_node
)
5390 minnode
= maxnode
= integer_zero_node
;
5393 minnode
= maxnode
= TREE_VALUE (values
);
5394 for (pair
= TREE_CHAIN (values
); pair
; pair
= TREE_CHAIN (pair
))
5396 tree value
= TREE_VALUE (pair
);
5397 if (tree_int_cst_lt (maxnode
, value
))
5399 if (tree_int_cst_lt (value
, minnode
))
5404 /* Construct the final type of this enumeration. It is the same
5405 as one of the integral types - the narrowest one that fits, except
5406 that normally we only go as narrow as int - and signed iff any of
5407 the values are negative. */
5408 unsign
= (tree_int_cst_sgn (minnode
) >= 0);
5409 precision
= MAX (min_precision (minnode
, unsign
),
5410 min_precision (maxnode
, unsign
));
5412 if (TYPE_PACKED (enumtype
) || precision
> TYPE_PRECISION (integer_type_node
))
5414 tem
= c_common_type_for_size (precision
, unsign
);
5417 warning ("enumeration values exceed range of largest integer");
5418 tem
= long_long_integer_type_node
;
5422 tem
= unsign
? unsigned_type_node
: integer_type_node
;
5424 TYPE_MIN_VALUE (enumtype
) = TYPE_MIN_VALUE (tem
);
5425 TYPE_MAX_VALUE (enumtype
) = TYPE_MAX_VALUE (tem
);
5426 TYPE_UNSIGNED (enumtype
) = TYPE_UNSIGNED (tem
);
5427 TYPE_SIZE (enumtype
) = 0;
5429 /* If the precision of the type was specific with an attribute and it
5430 was too small, give an error. Otherwise, use it. */
5431 if (TYPE_PRECISION (enumtype
))
5433 if (precision
> TYPE_PRECISION (enumtype
))
5434 error ("specified mode too small for enumeral values");
5437 TYPE_PRECISION (enumtype
) = TYPE_PRECISION (tem
);
5439 layout_type (enumtype
);
5441 if (values
!= error_mark_node
)
5443 /* Change the type of the enumerators to be the enum type. We
5444 need to do this irrespective of the size of the enum, for
5445 proper type checking. Replace the DECL_INITIALs of the
5446 enumerators, and the value slots of the list, with copies
5447 that have the enum type; they cannot be modified in place
5448 because they may be shared (e.g. integer_zero_node) Finally,
5449 change the purpose slots to point to the names of the decls. */
5450 for (pair
= values
; pair
; pair
= TREE_CHAIN (pair
))
5452 tree enu
= TREE_PURPOSE (pair
);
5453 tree ini
= DECL_INITIAL (enu
);
5455 TREE_TYPE (enu
) = enumtype
;
5457 /* The ISO C Standard mandates enumerators to have type int,
5458 even though the underlying type of an enum type is
5459 unspecified. Here we convert any enumerators that fit in
5460 an int to type int, to avoid promotions to unsigned types
5461 when comparing integers with enumerators that fit in the
5462 int range. When -pedantic is given, build_enumerator()
5463 would have already taken care of those that don't fit. */
5464 if (int_fits_type_p (ini
, integer_type_node
))
5465 tem
= integer_type_node
;
5468 ini
= convert (tem
, ini
);
5470 DECL_INITIAL (enu
) = ini
;
5471 TREE_PURPOSE (pair
) = DECL_NAME (enu
);
5472 TREE_VALUE (pair
) = ini
;
5475 TYPE_VALUES (enumtype
) = values
;
5478 /* Record the min/max values so that we can warn about bit-field
5479 enumerations that are too small for the values. */
5480 lt
= GGC_CNEW (struct lang_type
);
5481 lt
->enum_min
= minnode
;
5482 lt
->enum_max
= maxnode
;
5483 TYPE_LANG_SPECIFIC (enumtype
) = lt
;
5485 /* Fix up all variant types of this enum type. */
5486 for (tem
= TYPE_MAIN_VARIANT (enumtype
); tem
; tem
= TYPE_NEXT_VARIANT (tem
))
5488 if (tem
== enumtype
)
5490 TYPE_VALUES (tem
) = TYPE_VALUES (enumtype
);
5491 TYPE_MIN_VALUE (tem
) = TYPE_MIN_VALUE (enumtype
);
5492 TYPE_MAX_VALUE (tem
) = TYPE_MAX_VALUE (enumtype
);
5493 TYPE_SIZE (tem
) = TYPE_SIZE (enumtype
);
5494 TYPE_SIZE_UNIT (tem
) = TYPE_SIZE_UNIT (enumtype
);
5495 TYPE_MODE (tem
) = TYPE_MODE (enumtype
);
5496 TYPE_PRECISION (tem
) = TYPE_PRECISION (enumtype
);
5497 TYPE_ALIGN (tem
) = TYPE_ALIGN (enumtype
);
5498 TYPE_USER_ALIGN (tem
) = TYPE_USER_ALIGN (enumtype
);
5499 TYPE_UNSIGNED (tem
) = TYPE_UNSIGNED (enumtype
);
5500 TYPE_LANG_SPECIFIC (tem
) = TYPE_LANG_SPECIFIC (enumtype
);
5503 /* Finish debugging output for this type. */
5504 rest_of_type_compilation (enumtype
, toplevel
);
5509 /* Build and install a CONST_DECL for one value of the
5510 current enumeration type (one that was begun with start_enum).
5511 Return a tree-list containing the CONST_DECL and its value.
5512 Assignment of sequential values by default is handled here. */
5515 build_enumerator (tree name
, tree value
)
5519 /* Validate and default VALUE. */
5521 /* Remove no-op casts from the value. */
5523 STRIP_TYPE_NOPS (value
);
5527 /* Don't issue more errors for error_mark_node (i.e. an
5528 undeclared identifier) - just ignore the value expression. */
5529 if (value
== error_mark_node
)
5531 else if (TREE_CODE (value
) != INTEGER_CST
)
5533 error ("enumerator value for %qE is not an integer constant", name
);
5538 value
= default_conversion (value
);
5539 constant_expression_warning (value
);
5543 /* Default based on previous value. */
5544 /* It should no longer be possible to have NON_LVALUE_EXPR
5548 value
= enum_next_value
;
5550 error ("overflow in enumeration values");
5553 if (pedantic
&& ! int_fits_type_p (value
, integer_type_node
))
5555 pedwarn ("ISO C restricts enumerator values to range of %<int%>");
5556 /* XXX This causes -pedantic to change the meaning of the program.
5557 Remove? -zw 2004-03-15 */
5558 value
= convert (integer_type_node
, value
);
5561 /* Set basis for default for next value. */
5562 enum_next_value
= build_binary_op (PLUS_EXPR
, value
, integer_one_node
, 0);
5563 enum_overflow
= tree_int_cst_lt (enum_next_value
, value
);
5565 /* Now create a declaration for the enum value name. */
5567 type
= TREE_TYPE (value
);
5568 type
= c_common_type_for_size (MAX (TYPE_PRECISION (type
),
5569 TYPE_PRECISION (integer_type_node
)),
5570 (TYPE_PRECISION (type
)
5571 >= TYPE_PRECISION (integer_type_node
)
5572 && TYPE_UNSIGNED (type
)));
5574 decl
= build_decl (CONST_DECL
, name
, type
);
5575 DECL_INITIAL (decl
) = convert (type
, value
);
5578 return tree_cons (decl
, value
, NULL_TREE
);
5582 /* Create the FUNCTION_DECL for a function definition.
5583 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
5584 the declaration; they describe the function's name and the type it returns,
5585 but twisted together in a fashion that parallels the syntax of C.
5587 This function creates a binding context for the function body
5588 as well as setting up the FUNCTION_DECL in current_function_decl.
5590 Returns 1 on success. If the DECLARATOR is not suitable for a function
5591 (it defines a datum instead), we return 0, which tells
5592 yyparse to report a parse error. */
5595 start_function (struct c_declspecs
*declspecs
, struct c_declarator
*declarator
,
5598 tree decl1
, old_decl
;
5599 tree restype
, resdecl
;
5601 current_function_returns_value
= 0; /* Assume, until we see it does. */
5602 current_function_returns_null
= 0;
5603 current_function_returns_abnormally
= 0;
5604 warn_about_return_type
= 0;
5605 current_extern_inline
= 0;
5606 c_switch_stack
= NULL
;
5608 /* Indicate no valid break/continue context by setting these variables
5609 to some non-null, non-label value. We'll notice and emit the proper
5610 error message in c_finish_bc_stmt. */
5611 c_break_label
= c_cont_label
= size_zero_node
;
5613 decl1
= grokdeclarator (declarator
, declspecs
, FUNCDEF
, true, NULL
);
5615 /* If the declarator is not suitable for a function definition,
5616 cause a syntax error. */
5620 decl_attributes (&decl1
, attributes
, 0);
5622 if (DECL_DECLARED_INLINE_P (decl1
)
5623 && DECL_UNINLINABLE (decl1
)
5624 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1
)))
5625 warning ("%Jinline function %qD given attribute noinline", decl1
, decl1
);
5627 announce_function (decl1
);
5629 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1
))))
5631 error ("return type is an incomplete type");
5632 /* Make it return void instead. */
5634 = build_function_type (void_type_node
,
5635 TYPE_ARG_TYPES (TREE_TYPE (decl1
)));
5638 if (warn_about_return_type
)
5639 pedwarn_c99 ("return type defaults to %<int%>");
5641 /* Make the init_value nonzero so pushdecl knows this is not tentative.
5642 error_mark_node is replaced below (in pop_scope) with the BLOCK. */
5643 DECL_INITIAL (decl1
) = error_mark_node
;
5645 /* If this definition isn't a prototype and we had a prototype declaration
5646 before, copy the arg type info from that prototype.
5647 But not if what we had before was a builtin function. */
5648 old_decl
= lookup_name_in_scope (DECL_NAME (decl1
), current_scope
);
5649 if (old_decl
!= 0 && TREE_CODE (TREE_TYPE (old_decl
)) == FUNCTION_TYPE
5650 && !DECL_BUILT_IN (old_decl
)
5651 && comptypes (TREE_TYPE (TREE_TYPE (decl1
)),
5652 TREE_TYPE (TREE_TYPE (old_decl
)))
5653 && TYPE_ARG_TYPES (TREE_TYPE (decl1
)) == 0)
5655 TREE_TYPE (decl1
) = composite_type (TREE_TYPE (old_decl
),
5657 current_function_prototype_locus
= DECL_SOURCE_LOCATION (old_decl
);
5660 /* Optionally warn of old-fashioned def with no previous prototype. */
5661 if (warn_strict_prototypes
5662 && TYPE_ARG_TYPES (TREE_TYPE (decl1
)) == 0
5663 && C_DECL_ISNT_PROTOTYPE (old_decl
))
5664 warning ("function declaration isn%'t a prototype");
5665 /* Optionally warn of any global def with no previous prototype. */
5666 else if (warn_missing_prototypes
5667 && TREE_PUBLIC (decl1
)
5668 && ! MAIN_NAME_P (DECL_NAME (decl1
))
5669 && C_DECL_ISNT_PROTOTYPE (old_decl
))
5670 warning ("%Jno previous prototype for %qD", decl1
, decl1
);
5671 /* Optionally warn of any def with no previous prototype
5672 if the function has already been used. */
5673 else if (warn_missing_prototypes
5674 && old_decl
!= 0 && TREE_USED (old_decl
)
5675 && TYPE_ARG_TYPES (TREE_TYPE (old_decl
)) == 0)
5676 warning ("%J%qD was used with no prototype before its definition",
5678 /* Optionally warn of any global def with no previous declaration. */
5679 else if (warn_missing_declarations
5680 && TREE_PUBLIC (decl1
)
5682 && ! MAIN_NAME_P (DECL_NAME (decl1
)))
5683 warning ("%Jno previous declaration for %qD", decl1
, decl1
);
5684 /* Optionally warn of any def with no previous declaration
5685 if the function has already been used. */
5686 else if (warn_missing_declarations
5687 && old_decl
!= 0 && TREE_USED (old_decl
)
5688 && C_DECL_IMPLICIT (old_decl
))
5689 warning ("%J%qD was used with no declaration before its definition",
5692 /* This is a definition, not a reference.
5693 So normally clear DECL_EXTERNAL.
5694 However, `extern inline' acts like a declaration
5695 except for defining how to inline. So set DECL_EXTERNAL in that case. */
5696 DECL_EXTERNAL (decl1
) = current_extern_inline
;
5698 /* This function exists in static storage.
5699 (This does not mean `static' in the C sense!) */
5700 TREE_STATIC (decl1
) = 1;
5702 /* A nested function is not global. */
5703 if (current_function_decl
!= 0)
5704 TREE_PUBLIC (decl1
) = 0;
5706 /* This is the earliest point at which we might know the assembler
5707 name of the function. Thus, if it's set before this, die horribly. */
5708 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl1
));
5710 /* If #pragma weak was used, mark the decl weak now. */
5711 if (current_scope
== file_scope
)
5712 maybe_apply_pragma_weak (decl1
);
5714 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
5715 if (warn_main
> 0 && MAIN_NAME_P (DECL_NAME (decl1
)))
5720 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1
)))
5721 != integer_type_node
)
5722 pedwarn ("%Jreturn type of %qD is not %<int%>", decl1
, decl1
);
5724 for (args
= TYPE_ARG_TYPES (TREE_TYPE (decl1
)); args
;
5725 args
= TREE_CHAIN (args
))
5727 tree type
= args
? TREE_VALUE (args
) : 0;
5729 if (type
== void_type_node
)
5736 if (TYPE_MAIN_VARIANT (type
) != integer_type_node
)
5737 pedwarn ("%Jfirst argument of %qD should be %<int%>",
5742 if (TREE_CODE (type
) != POINTER_TYPE
5743 || TREE_CODE (TREE_TYPE (type
)) != POINTER_TYPE
5744 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type
)))
5746 pedwarn ("%Jsecond argument of %qD should be %<char **%>",
5751 if (TREE_CODE (type
) != POINTER_TYPE
5752 || TREE_CODE (TREE_TYPE (type
)) != POINTER_TYPE
5753 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type
)))
5755 pedwarn ("%Jthird argument of %qD should probably be "
5756 "%<char **%>", decl1
, decl1
);
5761 /* It is intentional that this message does not mention the third
5762 argument because it's only mentioned in an appendix of the
5764 if (argct
> 0 && (argct
< 2 || argct
> 3))
5765 pedwarn ("%J%qD takes only zero or two arguments", decl1
, decl1
);
5767 if (! TREE_PUBLIC (decl1
))
5768 pedwarn ("%J%qD is normally a non-static function", decl1
, decl1
);
5771 /* Record the decl so that the function name is defined.
5772 If we already have a decl for this name, and it is a FUNCTION_DECL,
5773 use the old decl. */
5775 current_function_decl
= pushdecl (decl1
);
5778 declare_parm_level ();
5780 restype
= TREE_TYPE (TREE_TYPE (current_function_decl
));
5781 /* Promote the value to int before returning it. */
5782 if (c_promoting_integer_type_p (restype
))
5784 /* It retains unsignedness if not really getting wider. */
5785 if (TYPE_UNSIGNED (restype
)
5786 && (TYPE_PRECISION (restype
)
5787 == TYPE_PRECISION (integer_type_node
)))
5788 restype
= unsigned_type_node
;
5790 restype
= integer_type_node
;
5793 resdecl
= build_decl (RESULT_DECL
, NULL_TREE
, restype
);
5794 DECL_ARTIFICIAL (resdecl
) = 1;
5795 DECL_IGNORED_P (resdecl
) = 1;
5796 DECL_RESULT (current_function_decl
) = resdecl
;
5798 start_fname_decls ();
5803 /* Subroutine of store_parm_decls which handles new-style function
5804 definitions (prototype format). The parms already have decls, so we
5805 need only record them as in effect and complain if any redundant
5806 old-style parm decls were written. */
5808 store_parm_decls_newstyle (tree fndecl
, const struct c_arg_info
*arg_info
)
5812 if (current_scope
->bindings
)
5814 error ("%Jold-style parameter declarations in prototyped "
5815 "function definition", fndecl
);
5817 /* Get rid of the old-style declarations. */
5821 /* Don't issue this warning for nested functions, and don't issue this
5822 warning if we got here because ARG_INFO_TYPES was error_mark_node
5823 (this happens when a function definition has just an ellipsis in
5824 its parameter list). */
5825 else if (warn_traditional
&& !in_system_header
&& !current_function_scope
5826 && arg_info
->types
!= error_mark_node
)
5827 warning ("%Jtraditional C rejects ISO C style function definitions",
5830 /* Now make all the parameter declarations visible in the function body.
5831 We can bypass most of the grunt work of pushdecl. */
5832 for (decl
= arg_info
->parms
; decl
; decl
= TREE_CHAIN (decl
))
5834 DECL_CONTEXT (decl
) = current_function_decl
;
5835 if (DECL_NAME (decl
))
5836 bind (DECL_NAME (decl
), decl
, current_scope
,
5837 /*invisible=*/false, /*nested=*/false);
5839 error ("%Jparameter name omitted", decl
);
5842 /* Record the parameter list in the function declaration. */
5843 DECL_ARGUMENTS (fndecl
) = arg_info
->parms
;
5845 /* Now make all the ancillary declarations visible, likewise. */
5846 for (decl
= arg_info
->others
; decl
; decl
= TREE_CHAIN (decl
))
5848 DECL_CONTEXT (decl
) = current_function_decl
;
5849 if (DECL_NAME (decl
))
5850 bind (DECL_NAME (decl
), decl
, current_scope
,
5851 /*invisible=*/false, /*nested=*/false);
5854 /* And all the tag declarations. */
5855 for (decl
= arg_info
->tags
; decl
; decl
= TREE_CHAIN (decl
))
5856 if (TREE_PURPOSE (decl
))
5857 bind (TREE_PURPOSE (decl
), TREE_VALUE (decl
), current_scope
,
5858 /*invisible=*/false, /*nested=*/false);
5861 /* Subroutine of store_parm_decls which handles old-style function
5862 definitions (separate parameter list and declarations). */
5865 store_parm_decls_oldstyle (tree fndecl
, const struct c_arg_info
*arg_info
)
5867 struct c_binding
*b
;
5868 tree parm
, decl
, last
;
5869 tree parmids
= arg_info
->parms
;
5871 /* We use DECL_WEAK as a flag to show which parameters have been
5872 seen already, since it is not used on PARM_DECL. */
5873 #ifdef ENABLE_CHECKING
5874 for (b
= current_scope
->bindings
; b
; b
= b
->prev
)
5875 gcc_assert (TREE_CODE (b
->decl
) != PARM_DECL
|| !DECL_WEAK (b
->decl
));
5878 if (warn_old_style_definition
&& !in_system_header
)
5879 warning ("%Jold-style function definition", fndecl
);
5881 /* Match each formal parameter name with its declaration. Save each
5882 decl in the appropriate TREE_PURPOSE slot of the parmids chain. */
5883 for (parm
= parmids
; parm
; parm
= TREE_CHAIN (parm
))
5885 if (TREE_VALUE (parm
) == 0)
5887 error ("%Jparameter name missing from parameter list", fndecl
);
5888 TREE_PURPOSE (parm
) = 0;
5892 b
= I_SYMBOL_BINDING (TREE_VALUE (parm
));
5893 if (b
&& B_IN_CURRENT_SCOPE (b
))
5896 /* If we got something other than a PARM_DECL it is an error. */
5897 if (TREE_CODE (decl
) != PARM_DECL
)
5898 error ("%J%qD declared as a non-parameter", decl
, decl
);
5899 /* If the declaration is already marked, we have a duplicate
5900 name. Complain and ignore the duplicate. */
5901 else if (DECL_WEAK (decl
))
5903 error ("%Jmultiple parameters named %qD", decl
, decl
);
5904 TREE_PURPOSE (parm
) = 0;
5907 /* If the declaration says "void", complain and turn it into
5909 else if (VOID_TYPE_P (TREE_TYPE (decl
)))
5911 error ("%Jparameter %qD declared with void type", decl
, decl
);
5912 TREE_TYPE (decl
) = integer_type_node
;
5913 DECL_ARG_TYPE (decl
) = integer_type_node
;
5914 layout_decl (decl
, 0);
5917 /* If no declaration found, default to int. */
5920 decl
= build_decl (PARM_DECL
, TREE_VALUE (parm
), integer_type_node
);
5921 DECL_ARG_TYPE (decl
) = TREE_TYPE (decl
);
5922 DECL_SOURCE_LOCATION (decl
) = DECL_SOURCE_LOCATION (fndecl
);
5926 pedwarn ("%Jtype of %qD defaults to %<int%>", decl
, decl
);
5927 else if (extra_warnings
)
5928 warning ("%Jtype of %qD defaults to %<int%>", decl
, decl
);
5931 TREE_PURPOSE (parm
) = decl
;
5932 DECL_WEAK (decl
) = 1;
5935 /* Now examine the parms chain for incomplete declarations
5936 and declarations with no corresponding names. */
5938 for (b
= current_scope
->bindings
; b
; b
= b
->prev
)
5941 if (TREE_CODE (parm
) != PARM_DECL
)
5944 if (!COMPLETE_TYPE_P (TREE_TYPE (parm
)))
5946 error ("%Jparameter %qD has incomplete type", parm
, parm
);
5947 TREE_TYPE (parm
) = error_mark_node
;
5950 if (! DECL_WEAK (parm
))
5952 error ("%Jdeclaration for parameter %qD but no such parameter",
5955 /* Pretend the parameter was not missing.
5956 This gets us to a standard state and minimizes
5957 further error messages. */
5958 parmids
= chainon (parmids
, tree_cons (parm
, 0, 0));
5962 /* Chain the declarations together in the order of the list of
5963 names. Store that chain in the function decl, replacing the
5964 list of names. Update the current scope to match. */
5965 DECL_ARGUMENTS (fndecl
) = 0;
5967 for (parm
= parmids
; parm
; parm
= TREE_CHAIN (parm
))
5968 if (TREE_PURPOSE (parm
))
5970 if (parm
&& TREE_PURPOSE (parm
))
5972 last
= TREE_PURPOSE (parm
);
5973 DECL_ARGUMENTS (fndecl
) = last
;
5974 DECL_WEAK (last
) = 0;
5976 for (parm
= TREE_CHAIN (parm
); parm
; parm
= TREE_CHAIN (parm
))
5977 if (TREE_PURPOSE (parm
))
5979 TREE_CHAIN (last
) = TREE_PURPOSE (parm
);
5980 last
= TREE_PURPOSE (parm
);
5981 DECL_WEAK (last
) = 0;
5983 TREE_CHAIN (last
) = 0;
5986 /* If there was a previous prototype,
5987 set the DECL_ARG_TYPE of each argument according to
5988 the type previously specified, and report any mismatches. */
5990 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl
)))
5993 for (parm
= DECL_ARGUMENTS (fndecl
),
5994 type
= TYPE_ARG_TYPES (TREE_TYPE (fndecl
));
5995 parm
|| (type
&& (TYPE_MAIN_VARIANT (TREE_VALUE (type
))
5996 != void_type_node
));
5997 parm
= TREE_CHAIN (parm
), type
= TREE_CHAIN (type
))
5999 if (parm
== 0 || type
== 0
6000 || TYPE_MAIN_VARIANT (TREE_VALUE (type
)) == void_type_node
)
6002 error ("number of arguments doesn%'t match prototype");
6003 error ("%Hprototype declaration",
6004 ¤t_function_prototype_locus
);
6007 /* Type for passing arg must be consistent with that
6008 declared for the arg. ISO C says we take the unqualified
6009 type for parameters declared with qualified type. */
6010 if (! comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm
)),
6011 TYPE_MAIN_VARIANT (TREE_VALUE (type
))))
6013 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm
))
6014 == TYPE_MAIN_VARIANT (TREE_VALUE (type
)))
6016 /* Adjust argument to match prototype. E.g. a previous
6017 `int foo(float);' prototype causes
6018 `int foo(x) float x; {...}' to be treated like
6019 `int foo(float x) {...}'. This is particularly
6020 useful for argument types like uid_t. */
6021 DECL_ARG_TYPE (parm
) = TREE_TYPE (parm
);
6023 if (targetm
.calls
.promote_prototypes (TREE_TYPE (current_function_decl
))
6024 && INTEGRAL_TYPE_P (TREE_TYPE (parm
))
6025 && TYPE_PRECISION (TREE_TYPE (parm
))
6026 < TYPE_PRECISION (integer_type_node
))
6027 DECL_ARG_TYPE (parm
) = integer_type_node
;
6031 pedwarn ("promoted argument %qD "
6032 "doesn%'t match prototype", parm
);
6033 pedwarn ("%Hprototype declaration",
6034 ¤t_function_prototype_locus
);
6039 error ("argument %qD doesn%'t match prototype", parm
);
6040 error ("%Hprototype declaration",
6041 ¤t_function_prototype_locus
);
6045 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl
)) = 0;
6048 /* Otherwise, create a prototype that would match. */
6052 tree actual
= 0, last
= 0, type
;
6054 for (parm
= DECL_ARGUMENTS (fndecl
); parm
; parm
= TREE_CHAIN (parm
))
6056 type
= tree_cons (NULL_TREE
, DECL_ARG_TYPE (parm
), NULL_TREE
);
6058 TREE_CHAIN (last
) = type
;
6063 type
= tree_cons (NULL_TREE
, void_type_node
, NULL_TREE
);
6065 TREE_CHAIN (last
) = type
;
6069 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6070 of the type of this function, but we need to avoid having this
6071 affect the types of other similarly-typed functions, so we must
6072 first force the generation of an identical (but separate) type
6073 node for the relevant function type. The new node we create
6074 will be a variant of the main variant of the original function
6077 TREE_TYPE (fndecl
) = build_variant_type_copy (TREE_TYPE (fndecl
));
6079 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl
)) = actual
;
6083 /* Store parameter declarations passed in ARG_INFO into the current
6084 function declaration. */
6087 store_parm_decls_from (struct c_arg_info
*arg_info
)
6089 current_function_arg_info
= arg_info
;
6090 store_parm_decls ();
6093 /* Store the parameter declarations into the current function declaration.
6094 This is called after parsing the parameter declarations, before
6095 digesting the body of the function.
6097 For an old-style definition, construct a prototype out of the old-style
6098 parameter declarations and inject it into the function's type. */
6101 store_parm_decls (void)
6103 tree fndecl
= current_function_decl
;
6106 /* The argument information block for FNDECL. */
6107 struct c_arg_info
*arg_info
= current_function_arg_info
;
6108 current_function_arg_info
= 0;
6110 /* True if this definition is written with a prototype. Note:
6111 despite C99 6.7.5.3p14, we can *not* treat an empty argument
6112 list in a function definition as equivalent to (void) -- an
6113 empty argument list specifies the function has no parameters,
6114 but only (void) sets up a prototype for future calls. */
6115 proto
= arg_info
->types
!= 0;
6118 store_parm_decls_newstyle (fndecl
, arg_info
);
6120 store_parm_decls_oldstyle (fndecl
, arg_info
);
6122 /* The next call to push_scope will be a function body. */
6124 next_is_function_body
= true;
6126 /* Write a record describing this function definition to the prototypes
6127 file (if requested). */
6129 gen_aux_info_record (fndecl
, 1, 0, proto
);
6131 /* Initialize the RTL code for the function. */
6132 allocate_struct_function (fndecl
);
6134 /* Begin the statement tree for this function. */
6135 DECL_SAVED_TREE (fndecl
) = push_stmt_list ();
6137 /* ??? Insert the contents of the pending sizes list into the function
6138 to be evaluated. This just changes mis-behavior until assign_parms
6139 phase ordering problems are resolved. */
6142 for (t
= nreverse (get_pending_sizes ()); t
; t
= TREE_CHAIN (t
))
6143 add_stmt (TREE_VALUE (t
));
6146 /* Even though we're inside a function body, we still don't want to
6147 call expand_expr to calculate the size of a variable-sized array.
6148 We haven't necessarily assigned RTL to all variables yet, so it's
6149 not safe to try to expand expressions involving them. */
6150 cfun
->x_dont_save_pending_sizes_p
= 1;
6153 /* Handle attribute((warn_unused_result)) on FNDECL and all its nested
6157 c_warn_unused_result_recursively (tree fndecl
)
6159 struct cgraph_node
*cgn
;
6161 /* Handle attribute((warn_unused_result)). Relies on gimple input. */
6162 c_warn_unused_result (&DECL_SAVED_TREE (fndecl
));
6164 /* Finalize all nested functions now. */
6165 cgn
= cgraph_node (fndecl
);
6166 for (cgn
= cgn
->nested
; cgn
; cgn
= cgn
->next_nested
)
6167 c_warn_unused_result_recursively (cgn
->decl
);
6170 /* Finish up a function declaration and compile that function
6171 all the way to assembler language output. The free the storage
6172 for the function definition.
6174 This is called after parsing the body of the function definition. */
6177 finish_function (void)
6179 tree fndecl
= current_function_decl
;
6181 if (TREE_CODE (fndecl
) == FUNCTION_DECL
6182 && targetm
.calls
.promote_prototypes (TREE_TYPE (fndecl
)))
6184 tree args
= DECL_ARGUMENTS (fndecl
);
6185 for (; args
; args
= TREE_CHAIN (args
))
6187 tree type
= TREE_TYPE (args
);
6188 if (INTEGRAL_TYPE_P (type
)
6189 && TYPE_PRECISION (type
) < TYPE_PRECISION (integer_type_node
))
6190 DECL_ARG_TYPE (args
) = integer_type_node
;
6194 if (DECL_INITIAL (fndecl
) && DECL_INITIAL (fndecl
) != error_mark_node
)
6195 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl
)) = fndecl
;
6197 /* Must mark the RESULT_DECL as being in this function. */
6199 if (DECL_RESULT (fndecl
) && DECL_RESULT (fndecl
) != error_mark_node
)
6200 DECL_CONTEXT (DECL_RESULT (fndecl
)) = fndecl
;
6202 if (MAIN_NAME_P (DECL_NAME (fndecl
)) && flag_hosted
)
6204 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl
)))
6205 != integer_type_node
)
6207 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6208 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6210 pedwarn ("%Jreturn type of %qD is not %<int%>", fndecl
, fndecl
);
6215 c_finish_return (integer_zero_node
);
6219 /* Tie off the statement tree for this function. */
6220 DECL_SAVED_TREE (fndecl
) = pop_stmt_list (DECL_SAVED_TREE (fndecl
));
6222 finish_fname_decls ();
6224 /* Complain if there's just no return statement. */
6225 if (warn_return_type
6226 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl
))) != VOID_TYPE
6227 && !current_function_returns_value
&& !current_function_returns_null
6228 /* Don't complain if we abort. */
6229 && !current_function_returns_abnormally
6230 /* Don't warn for main(). */
6231 && !MAIN_NAME_P (DECL_NAME (fndecl
))
6232 /* Or if they didn't actually specify a return type. */
6233 && !C_FUNCTION_IMPLICIT_INT (fndecl
)
6234 /* Normally, with -Wreturn-type, flow will complain. Unless we're an
6235 inline function, as we might never be compiled separately. */
6236 && DECL_INLINE (fndecl
))
6237 warning ("no return statement in function returning non-void");
6239 /* With just -Wextra, complain only if function returns both with
6240 and without a value. */
6242 && current_function_returns_value
6243 && current_function_returns_null
)
6244 warning ("this function may return with or without a value");
6246 /* Store the end of the function, so that we get good line number
6247 info for the epilogue. */
6248 cfun
->function_end_locus
= input_location
;
6250 /* If we don't have ctors/dtors sections, and this is a static
6251 constructor or destructor, it must be recorded now. */
6252 if (DECL_STATIC_CONSTRUCTOR (fndecl
)
6253 && !targetm
.have_ctors_dtors
)
6254 static_ctors
= tree_cons (NULL_TREE
, fndecl
, static_ctors
);
6255 if (DECL_STATIC_DESTRUCTOR (fndecl
)
6256 && !targetm
.have_ctors_dtors
)
6257 static_dtors
= tree_cons (NULL_TREE
, fndecl
, static_dtors
);
6259 /* Finalize the ELF visibility for the function. */
6260 c_determine_visibility (fndecl
);
6262 /* Genericize before inlining. Delay genericizing nested functions
6263 until their parent function is genericized. Since finalizing
6264 requires GENERIC, delay that as well. */
6266 if (DECL_INITIAL (fndecl
) && DECL_INITIAL (fndecl
) != error_mark_node
)
6268 if (!decl_function_context (fndecl
))
6270 c_genericize (fndecl
);
6271 c_warn_unused_result_recursively (fndecl
);
6273 /* ??? Objc emits functions after finalizing the compilation unit.
6274 This should be cleaned up later and this conditional removed. */
6275 if (cgraph_global_info_ready
)
6277 c_expand_body (fndecl
);
6281 cgraph_finalize_function (fndecl
, false);
6285 /* Register this function with cgraph just far enough to get it
6286 added to our parent's nested function list. Handy, since the
6287 C front end doesn't have such a list. */
6288 (void) cgraph_node (fndecl
);
6292 /* We're leaving the context of this function, so zap cfun.
6293 It's still in DECL_STRUCT_FUNCTION, and we'll restore it in
6294 tree_rest_of_compilation. */
6296 current_function_decl
= NULL
;
6299 /* Generate the RTL for the body of FNDECL. */
6302 c_expand_body (tree fndecl
)
6305 if (!DECL_INITIAL (fndecl
)
6306 || DECL_INITIAL (fndecl
) == error_mark_node
)
6309 tree_rest_of_compilation (fndecl
, false);
6311 if (DECL_STATIC_CONSTRUCTOR (fndecl
)
6312 && targetm
.have_ctors_dtors
)
6313 targetm
.asm_out
.constructor (XEXP (DECL_RTL (fndecl
), 0),
6314 DEFAULT_INIT_PRIORITY
);
6315 if (DECL_STATIC_DESTRUCTOR (fndecl
)
6316 && targetm
.have_ctors_dtors
)
6317 targetm
.asm_out
.destructor (XEXP (DECL_RTL (fndecl
), 0),
6318 DEFAULT_INIT_PRIORITY
);
6321 /* Check the declarations given in a for-loop for satisfying the C99
6324 check_for_loop_decls (void)
6326 struct c_binding
*b
;
6330 /* If we get here, declarations have been used in a for loop without
6331 the C99 for loop scope. This doesn't make much sense, so don't
6333 error ("%<for%> loop initial declaration used outside C99 mode");
6336 /* C99 subclause 6.8.5 paragraph 3:
6338 [#3] The declaration part of a for statement shall only
6339 declare identifiers for objects having storage class auto or
6342 It isn't clear whether, in this sentence, "identifiers" binds to
6343 "shall only declare" or to "objects" - that is, whether all identifiers
6344 declared must be identifiers for objects, or whether the restriction
6345 only applies to those that are. (A question on this in comp.std.c
6346 in November 2000 received no answer.) We implement the strictest
6347 interpretation, to avoid creating an extension which later causes
6350 for (b
= current_scope
->bindings
; b
; b
= b
->prev
)
6353 tree decl
= b
->decl
;
6358 switch (TREE_CODE (decl
))
6361 if (TREE_STATIC (decl
))
6362 error ("%Jdeclaration of static variable %qD in %<for%> loop "
6363 "initial declaration", decl
, decl
);
6364 else if (DECL_EXTERNAL (decl
))
6365 error ("%Jdeclaration of %<extern%> variable %qD in %<for%> loop "
6366 "initial declaration", decl
, decl
);
6370 error ("%<struct %E%> declared in %<for%> loop initial declaration",
6374 error ("%<union %E%> declared in %<for%> loop initial declaration",
6378 error ("%<enum %E%> declared in %<for%> loop initial declaration",
6382 error ("%Jdeclaration of non-variable %qD in %<for%> loop "
6383 "initial declaration", decl
, decl
);
6388 /* Save and reinitialize the variables
6389 used during compilation of a C function. */
6392 c_push_function_context (struct function
*f
)
6394 struct language_function
*p
;
6395 p
= GGC_NEW (struct language_function
);
6398 p
->base
.x_stmt_tree
= c_stmt_tree
;
6399 p
->x_break_label
= c_break_label
;
6400 p
->x_cont_label
= c_cont_label
;
6401 p
->x_switch_stack
= c_switch_stack
;
6402 p
->arg_info
= current_function_arg_info
;
6403 p
->returns_value
= current_function_returns_value
;
6404 p
->returns_null
= current_function_returns_null
;
6405 p
->returns_abnormally
= current_function_returns_abnormally
;
6406 p
->warn_about_return_type
= warn_about_return_type
;
6407 p
->extern_inline
= current_extern_inline
;
6410 /* Restore the variables used during compilation of a C function. */
6413 c_pop_function_context (struct function
*f
)
6415 struct language_function
*p
= f
->language
;
6417 if (DECL_STRUCT_FUNCTION (current_function_decl
) == 0
6418 && DECL_SAVED_TREE (current_function_decl
) == NULL_TREE
)
6420 /* Stop pointing to the local nodes about to be freed. */
6421 /* But DECL_INITIAL must remain nonzero so we know this
6422 was an actual function definition. */
6423 DECL_INITIAL (current_function_decl
) = error_mark_node
;
6424 DECL_ARGUMENTS (current_function_decl
) = 0;
6427 c_stmt_tree
= p
->base
.x_stmt_tree
;
6428 c_break_label
= p
->x_break_label
;
6429 c_cont_label
= p
->x_cont_label
;
6430 c_switch_stack
= p
->x_switch_stack
;
6431 current_function_arg_info
= p
->arg_info
;
6432 current_function_returns_value
= p
->returns_value
;
6433 current_function_returns_null
= p
->returns_null
;
6434 current_function_returns_abnormally
= p
->returns_abnormally
;
6435 warn_about_return_type
= p
->warn_about_return_type
;
6436 current_extern_inline
= p
->extern_inline
;
6441 /* Copy the DECL_LANG_SPECIFIC data associated with DECL. */
6444 c_dup_lang_specific_decl (tree decl
)
6446 struct lang_decl
*ld
;
6448 if (!DECL_LANG_SPECIFIC (decl
))
6451 ld
= GGC_NEW (struct lang_decl
);
6452 memcpy (ld
, DECL_LANG_SPECIFIC (decl
), sizeof (struct lang_decl
));
6453 DECL_LANG_SPECIFIC (decl
) = ld
;
6456 /* The functions below are required for functionality of doing
6457 function at once processing in the C front end. Currently these
6458 functions are not called from anywhere in the C front end, but as
6459 these changes continue, that will change. */
6461 /* Returns nonzero if the current statement is a full expression,
6462 i.e. temporaries created during that statement should be destroyed
6463 at the end of the statement. */
6466 stmts_are_full_exprs_p (void)
6471 /* Returns the stmt_tree (if any) to which statements are currently
6472 being added. If there is no active statement-tree, NULL is
6476 current_stmt_tree (void)
6478 return &c_stmt_tree
;
6481 /* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
6485 anon_aggr_type_p (tree
ARG_UNUSED (node
))
6490 /* Return the global value of T as a symbol. */
6493 identifier_global_value (tree t
)
6495 struct c_binding
*b
;
6497 for (b
= I_SYMBOL_BINDING (t
); b
; b
= b
->shadowed
)
6498 if (B_IN_FILE_SCOPE (b
) || B_IN_EXTERNAL_SCOPE (b
))
6504 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
6505 otherwise the name is found in ridpointers from RID_INDEX. */
6508 record_builtin_type (enum rid rid_index
, const char *name
, tree type
)
6512 id
= ridpointers
[(int) rid_index
];
6514 id
= get_identifier (name
);
6515 decl
= build_decl (TYPE_DECL
, id
, type
);
6517 if (debug_hooks
->type_decl
)
6518 debug_hooks
->type_decl (decl
, false);
6521 /* Build the void_list_node (void_type_node having been created). */
6523 build_void_list_node (void)
6525 tree t
= build_tree_list (NULL_TREE
, void_type_node
);
6529 /* Return a c_parm structure with the given SPECS, ATTRS and DECLARATOR. */
6532 build_c_parm (struct c_declspecs
*specs
, tree attrs
,
6533 struct c_declarator
*declarator
)
6535 struct c_parm
*ret
= XOBNEW (&parser_obstack
, struct c_parm
);
6538 ret
->declarator
= declarator
;
6542 /* Return a declarator with nested attributes. TARGET is the inner
6543 declarator to which these attributes apply. ATTRS are the
6546 struct c_declarator
*
6547 build_attrs_declarator (tree attrs
, struct c_declarator
*target
)
6549 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
6550 ret
->kind
= cdk_attrs
;
6551 ret
->declarator
= target
;
6552 ret
->u
.attrs
= attrs
;
6556 /* Return a declarator for a function with arguments specified by ARGS
6557 and return type specified by TARGET. */
6559 struct c_declarator
*
6560 build_function_declarator (struct c_arg_info
*args
,
6561 struct c_declarator
*target
)
6563 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
6564 ret
->kind
= cdk_function
;
6565 ret
->declarator
= target
;
6566 ret
->u
.arg_info
= args
;
6570 /* Return a declarator for the identifier IDENT (which may be
6571 NULL_TREE for an abstract declarator). */
6573 struct c_declarator
*
6574 build_id_declarator (tree ident
)
6576 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
6578 ret
->declarator
= 0;
6583 /* Return something to represent absolute declarators containing a *.
6584 TARGET is the absolute declarator that the * contains.
6585 TYPE_QUALS_ATTRS is a structure for type qualifiers and attributes
6586 to apply to the pointer type. */
6588 struct c_declarator
*
6589 make_pointer_declarator (struct c_declspecs
*type_quals_attrs
,
6590 struct c_declarator
*target
)
6594 struct c_declarator
*itarget
= target
;
6595 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
6596 if (type_quals_attrs
)
6598 attrs
= type_quals_attrs
->attrs
;
6599 quals
= quals_from_declspecs (type_quals_attrs
);
6600 if (attrs
!= NULL_TREE
)
6601 itarget
= build_attrs_declarator (attrs
, target
);
6603 ret
->kind
= cdk_pointer
;
6604 ret
->declarator
= itarget
;
6605 ret
->u
.pointer_quals
= quals
;
6609 /* Return a pointer to a structure for an empty list of declaration
6612 struct c_declspecs
*
6613 build_null_declspecs (void)
6615 struct c_declspecs
*ret
= XOBNEW (&parser_obstack
, struct c_declspecs
);
6619 ret
->typespec_word
= cts_none
;
6620 ret
->storage_class
= csc_none
;
6621 ret
->non_sc_seen_p
= false;
6622 ret
->typedef_p
= false;
6623 ret
->explicit_signed_p
= false;
6624 ret
->deprecated_p
= false;
6625 ret
->default_int_p
= false;
6626 ret
->long_p
= false;
6627 ret
->long_long_p
= false;
6628 ret
->short_p
= false;
6629 ret
->signed_p
= false;
6630 ret
->unsigned_p
= false;
6631 ret
->complex_p
= false;
6632 ret
->inline_p
= false;
6633 ret
->thread_p
= false;
6634 ret
->const_p
= false;
6635 ret
->volatile_p
= false;
6636 ret
->restrict_p
= false;
6640 /* Add the type qualifier QUAL to the declaration specifiers SPECS,
6643 struct c_declspecs
*
6644 declspecs_add_qual (struct c_declspecs
*specs
, tree qual
)
6648 specs
->non_sc_seen_p
= true;
6649 gcc_assert (TREE_CODE (qual
) == IDENTIFIER_NODE
6650 && C_IS_RESERVED_WORD (qual
));
6651 i
= C_RID_CODE (qual
);
6655 dupe
= specs
->const_p
;
6656 specs
->const_p
= true;
6659 dupe
= specs
->volatile_p
;
6660 specs
->volatile_p
= true;
6663 dupe
= specs
->restrict_p
;
6664 specs
->restrict_p
= true;
6669 if (dupe
&& pedantic
&& !flag_isoc99
)
6670 pedwarn ("duplicate %qs", IDENTIFIER_POINTER (qual
));
6674 /* Add the type specifier TYPE to the declaration specifiers SPECS,
6677 struct c_declspecs
*
6678 declspecs_add_type (struct c_declspecs
*specs
, tree type
)
6680 specs
->non_sc_seen_p
= true;
6681 if (TREE_DEPRECATED (type
))
6682 specs
->deprecated_p
= true;
6684 /* Handle type specifier keywords. */
6685 if (TREE_CODE (type
) == IDENTIFIER_NODE
&& C_IS_RESERVED_WORD (type
))
6687 enum rid i
= C_RID_CODE (type
);
6690 error ("two or more data types in declaration specifiers");
6693 if ((int) i
<= (int) RID_LAST_MODIFIER
)
6695 /* "long", "short", "signed", "unsigned" or "_Complex". */
6700 if (specs
->long_long_p
)
6702 error ("%<long long long%> is too long for GCC");
6707 if (specs
->typespec_word
== cts_double
)
6709 error ("both %<long long%> and %<double%> in "
6710 "declaration specifiers");
6713 if (pedantic
&& !flag_isoc99
&& !in_system_header
6715 pedwarn ("ISO C90 does not support %<long long%>");
6716 specs
->long_long_p
= 1;
6720 error ("both %<long%> and %<short%> in "
6721 "declaration specifiers");
6722 else if (specs
->typespec_word
== cts_void
)
6723 error ("both %<long%> and %<void%> in "
6724 "declaration specifiers");
6725 else if (specs
->typespec_word
== cts_bool
)
6726 error ("both %<long%> and %<_Bool%> in "
6727 "declaration specifiers");
6728 else if (specs
->typespec_word
== cts_char
)
6729 error ("both %<long%> and %<char%> in "
6730 "declaration specifiers");
6731 else if (specs
->typespec_word
== cts_float
)
6732 error ("both %<long%> and %<float%> in "
6733 "declaration specifiers");
6735 specs
->long_p
= true;
6738 dupe
= specs
->short_p
;
6740 error ("both %<long%> and %<short%> in "
6741 "declaration specifiers");
6742 else if (specs
->typespec_word
== cts_void
)
6743 error ("both %<short%> and %<void%> in "
6744 "declaration specifiers");
6745 else if (specs
->typespec_word
== cts_bool
)
6746 error ("both %<short%> and %<_Bool%> in "
6747 "declaration specifiers");
6748 else if (specs
->typespec_word
== cts_char
)
6749 error ("both %<short%> and %<char%> in "
6750 "declaration specifiers");
6751 else if (specs
->typespec_word
== cts_float
)
6752 error ("both %<short%> and %<float%> in "
6753 "declaration specifiers");
6754 else if (specs
->typespec_word
== cts_double
)
6755 error ("both %<short%> and %<double%> in "
6756 "declaration specifiers");
6758 specs
->short_p
= true;
6761 dupe
= specs
->signed_p
;
6762 if (specs
->unsigned_p
)
6763 error ("both %<signed%> and %<unsigned%> in "
6764 "declaration specifiers");
6765 else if (specs
->typespec_word
== cts_void
)
6766 error ("both %<signed%> and %<void%> in "
6767 "declaration specifiers");
6768 else if (specs
->typespec_word
== cts_bool
)
6769 error ("both %<signed%> and %<_Bool%> in "
6770 "declaration specifiers");
6771 else if (specs
->typespec_word
== cts_float
)
6772 error ("both %<signed%> and %<float%> in "
6773 "declaration specifiers");
6774 else if (specs
->typespec_word
== cts_double
)
6775 error ("both %<signed%> and %<double%> in "
6776 "declaration specifiers");
6778 specs
->signed_p
= true;
6781 dupe
= specs
->unsigned_p
;
6782 if (specs
->signed_p
)
6783 error ("both %<signed%> and %<unsigned%> in "
6784 "declaration specifiers");
6785 else if (specs
->typespec_word
== cts_void
)
6786 error ("both %<unsigned%> and %<void%> in "
6787 "declaration specifiers");
6788 else if (specs
->typespec_word
== cts_bool
)
6789 error ("both %<unsigned%> and %<_Bool%> in "
6790 "declaration specifiers");
6791 else if (specs
->typespec_word
== cts_float
)
6792 error ("both %<unsigned%> and %<float%> in "
6793 "declaration specifiers");
6794 else if (specs
->typespec_word
== cts_double
)
6795 error ("both %<unsigned%> and %<double%> in "
6796 "declaration specifiers");
6798 specs
->unsigned_p
= true;
6801 dupe
= specs
->complex_p
;
6802 if (pedantic
&& !flag_isoc99
)
6803 pedwarn ("ISO C90 does not support complex types");
6804 if (specs
->typespec_word
== cts_void
)
6805 error ("both %<complex%> and %<void%> in "
6806 "declaration specifiers");
6807 else if (specs
->typespec_word
== cts_bool
)
6808 error ("both %<complex%> and %<_Bool%> in "
6809 "declaration specifiers");
6811 specs
->complex_p
= true;
6818 error ("duplicate %qs", IDENTIFIER_POINTER (type
));
6824 /* "void", "_Bool", "char", "int", "float" or "double". */
6825 if (specs
->typespec_word
!= cts_none
)
6827 error ("two or more data types in declaration specifiers");
6834 error ("both %<long%> and %<void%> in "
6835 "declaration specifiers");
6836 else if (specs
->short_p
)
6837 error ("both %<short%> and %<void%> in "
6838 "declaration specifiers");
6839 else if (specs
->signed_p
)
6840 error ("both %<signed%> and %<void%> in "
6841 "declaration specifiers");
6842 else if (specs
->unsigned_p
)
6843 error ("both %<unsigned%> and %<void%> in "
6844 "declaration specifiers");
6845 else if (specs
->complex_p
)
6846 error ("both %<complex%> and %<void%> in "
6847 "declaration specifiers");
6849 specs
->typespec_word
= cts_void
;
6853 error ("both %<long%> and %<_Bool%> in "
6854 "declaration specifiers");
6855 else if (specs
->short_p
)
6856 error ("both %<short%> and %<_Bool%> in "
6857 "declaration specifiers");
6858 else if (specs
->signed_p
)
6859 error ("both %<signed%> and %<_Bool%> in "
6860 "declaration specifiers");
6861 else if (specs
->unsigned_p
)
6862 error ("both %<unsigned%> and %<_Bool%> in "
6863 "declaration specifiers");
6864 else if (specs
->complex_p
)
6865 error ("both %<complex%> and %<_Bool%> in "
6866 "declaration specifiers");
6868 specs
->typespec_word
= cts_bool
;
6872 error ("both %<long%> and %<char%> in "
6873 "declaration specifiers");
6874 else if (specs
->short_p
)
6875 error ("both %<short%> and %<char%> in "
6876 "declaration specifiers");
6878 specs
->typespec_word
= cts_char
;
6881 specs
->typespec_word
= cts_int
;
6885 error ("both %<long%> and %<float%> in "
6886 "declaration specifiers");
6887 else if (specs
->short_p
)
6888 error ("both %<short%> and %<float%> in "
6889 "declaration specifiers");
6890 else if (specs
->signed_p
)
6891 error ("both %<signed%> and %<float%> in "
6892 "declaration specifiers");
6893 else if (specs
->unsigned_p
)
6894 error ("both %<unsigned%> and %<float%> in "
6895 "declaration specifiers");
6897 specs
->typespec_word
= cts_float
;
6900 if (specs
->long_long_p
)
6901 error ("both %<long long%> and %<double%> in "
6902 "declaration specifiers");
6903 else if (specs
->short_p
)
6904 error ("both %<short%> and %<double%> in "
6905 "declaration specifiers");
6906 else if (specs
->signed_p
)
6907 error ("both %<signed%> and %<double%> in "
6908 "declaration specifiers");
6909 else if (specs
->unsigned_p
)
6910 error ("both %<unsigned%> and %<double%> in "
6911 "declaration specifiers");
6913 specs
->typespec_word
= cts_double
;
6916 /* ObjC reserved word "id", handled below. */
6922 /* Now we have a typedef (a TYPE_DECL node), an identifier (some
6923 form of ObjC type, cases such as "int" and "long" being handled
6924 above), a TYPE (struct, union, enum and typeof specifiers) or an
6925 ERROR_MARK. In none of these cases may there have previously
6926 been any type specifiers. */
6927 if (specs
->type
|| specs
->typespec_word
!= cts_none
6928 || specs
->long_p
|| specs
->short_p
|| specs
->signed_p
6929 || specs
->unsigned_p
|| specs
->complex_p
)
6930 error ("two or more data types in declaration specifiers");
6931 else if (TREE_CODE (type
) == TYPE_DECL
)
6933 if (TREE_TYPE (type
) == error_mark_node
)
6934 ; /* Allow the type to default to int to avoid cascading errors. */
6937 specs
->type
= TREE_TYPE (type
);
6938 specs
->decl_attr
= DECL_ATTRIBUTES (type
);
6939 specs
->typedef_p
= true;
6940 specs
->explicit_signed_p
= C_TYPEDEF_EXPLICITLY_SIGNED (type
);
6943 else if (TREE_CODE (type
) == IDENTIFIER_NODE
)
6945 tree t
= lookup_name (type
);
6946 if (!t
|| TREE_CODE (t
) != TYPE_DECL
)
6947 error ("%qs fails to be a typedef or built in type",
6948 IDENTIFIER_POINTER (type
));
6949 else if (TREE_TYPE (t
) == error_mark_node
)
6952 specs
->type
= TREE_TYPE (t
);
6954 else if (TREE_CODE (type
) != ERROR_MARK
)
6960 /* Add the storage class specifier or function specifier SCSPEC to the
6961 declaration specifiers SPECS, returning SPECS. */
6963 struct c_declspecs
*
6964 declspecs_add_scspec (struct c_declspecs
*specs
, tree scspec
)
6967 enum c_storage_class n
= csc_none
;
6969 gcc_assert (TREE_CODE (scspec
) == IDENTIFIER_NODE
6970 && C_IS_RESERVED_WORD (scspec
));
6971 i
= C_RID_CODE (scspec
);
6972 if (extra_warnings
&& specs
->non_sc_seen_p
)
6973 warning ("%qs is not at beginning of declaration",
6974 IDENTIFIER_POINTER (scspec
));
6978 /* C99 permits duplicate inline. Although of doubtful utility,
6979 it seems simplest to permit it in gnu89 mode as well, as
6980 there is also little utility in maintaining this as a
6981 difference between gnu89 and C99 inline. */
6983 specs
->inline_p
= true;
6986 dupe
= specs
->thread_p
;
6987 if (specs
->storage_class
== csc_auto
)
6988 error ("%<__thread%> used with %<auto%>");
6989 else if (specs
->storage_class
== csc_register
)
6990 error ("%<__thread%> used with %<register%>");
6991 else if (specs
->storage_class
== csc_typedef
)
6992 error ("%<__thread%> used with %<typedef%>");
6994 specs
->thread_p
= true;
7001 /* Diagnose "__thread extern". */
7002 if (specs
->thread_p
)
7003 error ("%<__thread%> before %<extern%>");
7010 /* Diagnose "__thread static". */
7011 if (specs
->thread_p
)
7012 error ("%<__thread%> before %<static%>");
7020 if (n
!= csc_none
&& n
== specs
->storage_class
)
7023 error ("duplicate %qs", IDENTIFIER_POINTER (scspec
));
7026 if (specs
->storage_class
!= csc_none
&& n
!= specs
->storage_class
)
7028 error ("multiple storage classes in declaration specifiers");
7032 specs
->storage_class
= n
;
7033 if (n
!= csc_extern
&& n
!= csc_static
&& specs
->thread_p
)
7035 error ("%<__thread%> used with %qs",
7036 IDENTIFIER_POINTER (scspec
));
7037 specs
->thread_p
= false;
7044 /* Add the attributes ATTRS to the declaration specifiers SPECS,
7047 struct c_declspecs
*
7048 declspecs_add_attrs (struct c_declspecs
*specs
, tree attrs
)
7050 specs
->attrs
= chainon (attrs
, specs
->attrs
);
7054 /* Combine "long", "short", "signed", "unsigned" and "_Complex" type
7055 specifiers with any other type specifier to determine the resulting
7056 type. This is where ISO C checks on complex types are made, since
7057 "_Complex long" is a prefix of the valid ISO C type "_Complex long
7060 struct c_declspecs
*
7061 finish_declspecs (struct c_declspecs
*specs
)
7063 /* If a type was specified as a whole, we have no modifiers and are
7065 if (specs
->type
!= NULL_TREE
)
7067 gcc_assert (!specs
->long_p
&& !specs
->long_long_p
&& !specs
->short_p
7068 && !specs
->signed_p
&& !specs
->unsigned_p
7069 && !specs
->complex_p
);
7073 /* If none of "void", "_Bool", "char", "int", "float" or "double"
7074 has been specified, treat it as "int" unless "_Complex" is
7075 present and there are no other specifiers. If we just have
7076 "_Complex", it is equivalent to "_Complex double", but e.g.
7077 "_Complex short" is equivalent to "_Complex short int". */
7078 if (specs
->typespec_word
== cts_none
)
7080 if (specs
->long_p
|| specs
->short_p
7081 || specs
->signed_p
|| specs
->unsigned_p
)
7083 specs
->typespec_word
= cts_int
;
7085 else if (specs
->complex_p
)
7087 specs
->typespec_word
= cts_double
;
7089 pedwarn ("ISO C does not support plain %<complex%> meaning "
7090 "%<double complex%>");
7094 specs
->typespec_word
= cts_int
;
7095 specs
->default_int_p
= true;
7096 /* We don't diagnose this here because grokdeclarator will
7097 give more specific diagnostics according to whether it is
7098 a function definition. */
7102 /* If "signed" was specified, record this to distinguish "int" and
7103 "signed int" in the case of a bit-field with
7104 -funsigned-bitfields. */
7105 specs
->explicit_signed_p
= specs
->signed_p
;
7107 /* Now compute the actual type. */
7108 switch (specs
->typespec_word
)
7111 gcc_assert (!specs
->long_p
&& !specs
->short_p
7112 && !specs
->signed_p
&& !specs
->unsigned_p
7113 && !specs
->complex_p
);
7114 specs
->type
= void_type_node
;
7117 gcc_assert (!specs
->long_p
&& !specs
->short_p
7118 && !specs
->signed_p
&& !specs
->unsigned_p
7119 && !specs
->complex_p
);
7120 specs
->type
= boolean_type_node
;
7123 gcc_assert (!specs
->long_p
&& !specs
->short_p
);
7124 gcc_assert (!(specs
->signed_p
&& specs
->unsigned_p
));
7125 if (specs
->signed_p
)
7126 specs
->type
= signed_char_type_node
;
7127 else if (specs
->unsigned_p
)
7128 specs
->type
= unsigned_char_type_node
;
7130 specs
->type
= char_type_node
;
7131 if (specs
->complex_p
)
7134 pedwarn ("ISO C does not support complex integer types");
7135 specs
->type
= build_complex_type (specs
->type
);
7139 gcc_assert (!(specs
->long_p
&& specs
->short_p
));
7140 gcc_assert (!(specs
->signed_p
&& specs
->unsigned_p
));
7141 if (specs
->long_long_p
)
7142 specs
->type
= (specs
->unsigned_p
7143 ? long_long_unsigned_type_node
7144 : long_long_integer_type_node
);
7145 else if (specs
->long_p
)
7146 specs
->type
= (specs
->unsigned_p
7147 ? long_unsigned_type_node
7148 : long_integer_type_node
);
7149 else if (specs
->short_p
)
7150 specs
->type
= (specs
->unsigned_p
7151 ? short_unsigned_type_node
7152 : short_integer_type_node
);
7154 specs
->type
= (specs
->unsigned_p
7155 ? unsigned_type_node
7156 : integer_type_node
);
7157 if (specs
->complex_p
)
7160 pedwarn ("ISO C does not support complex integer types");
7161 specs
->type
= build_complex_type (specs
->type
);
7165 gcc_assert (!specs
->long_p
&& !specs
->short_p
7166 && !specs
->signed_p
&& !specs
->unsigned_p
);
7167 specs
->type
= (specs
->complex_p
7168 ? complex_float_type_node
7172 gcc_assert (!specs
->long_long_p
&& !specs
->short_p
7173 && !specs
->signed_p
&& !specs
->unsigned_p
);
7176 specs
->type
= (specs
->complex_p
7177 ? complex_long_double_type_node
7178 : long_double_type_node
);
7182 specs
->type
= (specs
->complex_p
7183 ? complex_double_type_node
7184 : double_type_node
);
7194 /* Synthesize a function which calls all the global ctors or global
7195 dtors in this file. This is only used for targets which do not
7196 support .ctors/.dtors sections. FIXME: Migrate into cgraph. */
7198 build_cdtor (int method_type
, tree cdtors
)
7205 for (; cdtors
; cdtors
= TREE_CHAIN (cdtors
))
7206 append_to_statement_list (build_function_call (TREE_VALUE (cdtors
), 0),
7209 cgraph_build_static_cdtor (method_type
, body
, DEFAULT_INIT_PRIORITY
);
7212 /* Perform final processing on one file scope's declarations (or the
7213 external scope's declarations), GLOBALS. */
7215 c_write_global_declarations_1 (tree globals
)
7217 size_t len
= list_length (globals
);
7218 tree
*vec
= XNEWVEC (tree
, len
);
7222 /* Process the decls in the order they were written. */
7223 for (i
= 0, decl
= globals
; i
< len
; i
++, decl
= TREE_CHAIN (decl
))
7226 /* Check for used but undefined static functions using the C
7227 standard's definition of "used", and set TREE_NO_WARNING so
7228 that check_global_declarations doesn't repeat the check. */
7229 if (TREE_CODE (decl
) == FUNCTION_DECL
7230 && DECL_INITIAL (decl
) == 0
7231 && DECL_EXTERNAL (decl
)
7232 && !TREE_PUBLIC (decl
)
7233 && C_DECL_USED (decl
))
7235 pedwarn ("%J%qF used but never defined", decl
, decl
);
7236 TREE_NO_WARNING (decl
) = 1;
7240 wrapup_global_declarations (vec
, len
);
7241 check_global_declarations (vec
, len
);
7247 c_write_global_declarations (void)
7251 /* We don't want to do this if generating a PCH. */
7255 /* Don't waste time on further processing if -fsyntax-only or we've
7256 encountered errors. */
7257 if (flag_syntax_only
|| errorcount
|| sorrycount
|| cpp_errors (parse_in
))
7260 /* Close the external scope. */
7261 ext_block
= pop_scope ();
7263 gcc_assert (!current_scope
);
7265 /* Process all file scopes in this compilation, and the external_scope,
7266 through wrapup_global_declarations and check_global_declarations. */
7267 for (t
= all_translation_units
; t
; t
= TREE_CHAIN (t
))
7268 c_write_global_declarations_1 (BLOCK_VARS (DECL_INITIAL (t
)));
7269 c_write_global_declarations_1 (BLOCK_VARS (ext_block
));
7271 /* Generate functions to call static constructors and destructors
7272 for targets that do not support .ctors/.dtors sections. These
7273 functions have magic names which are detected by collect2. */
7274 build_cdtor ('I', static_ctors
); static_ctors
= 0;
7275 build_cdtor ('D', static_dtors
); static_dtors
= 0;
7277 /* We're done parsing; proceed to optimize and emit assembly.
7278 FIXME: shouldn't be the front end's responsibility to call this. */
7281 /* Presently this has to happen after cgraph_optimize.
7282 FIXME: shouldn't be the front end's responsibility to call this. */
7284 mudflap_finish_file ();
7287 #include "gt-c-decl.h"