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 /* These #defines are for clarity in working with the information block
95 returned by get_parm_info. */
96 #define ARG_INFO_PARMS(args) TREE_PURPOSE(args)
97 #define ARG_INFO_TAGS(args) TREE_VALUE(args)
98 #define ARG_INFO_TYPES(args) TREE_CHAIN(args)
99 #define ARG_INFO_OTHERS(args) TREE_TYPE(args)
101 /* The file and line that the prototype came from if this is an
102 old-style definition; used for diagnostics in
103 store_parm_decls_oldstyle. */
105 static location_t current_function_prototype_locus
;
107 /* The argument information structure for the function currently being
110 static GTY(()) tree current_function_arg_info
;
112 /* The current statement tree. */
114 static GTY(()) struct stmt_tree_s c_stmt_tree
;
116 /* State saving variables. */
120 /* Linked list of TRANSLATION_UNIT_DECLS for the translation units
121 included in this invocation. Note that the current translation
122 unit is not included in this list. */
124 static GTY(()) tree all_translation_units
;
126 /* A list of decls to be made automatically visible in each file scope. */
127 static GTY(()) tree visible_builtins
;
129 /* Set to 0 at beginning of a function definition, set to 1 if
130 a return statement that specifies a return value is seen. */
132 int current_function_returns_value
;
134 /* Set to 0 at beginning of a function definition, set to 1 if
135 a return statement with no argument is seen. */
137 int current_function_returns_null
;
139 /* Set to 0 at beginning of a function definition, set to 1 if
140 a call to a noreturn function is seen. */
142 int current_function_returns_abnormally
;
144 /* Set to nonzero by `grokdeclarator' for a function
145 whose return type is defaulted, if warnings for this are desired. */
147 static int warn_about_return_type
;
149 /* Nonzero when starting a function declared `extern inline'. */
151 static int current_extern_inline
;
153 /* True means global_bindings_p should return false even if the scope stack
154 says we are in file scope. */
155 bool c_override_global_bindings_to_false
;
158 /* Each c_binding structure describes one binding of an identifier to
159 a decl. All the decls in a scope - irrespective of namespace - are
160 chained together by the ->prev field, which (as the name implies)
161 runs in reverse order. All the decls in a given namespace bound to
162 a given identifier are chained by the ->shadowed field, which runs
163 from inner to outer scopes.
165 The ->decl field usually points to a DECL node, but there are two
166 exceptions. In the namespace of type tags, the bound entity is a
167 RECORD_TYPE, UNION_TYPE, or ENUMERAL_TYPE node. If an undeclared
168 identifier is encountered, it is bound to error_mark_node to
169 suppress further errors about that identifier in the current
172 The ->type field stores the type of the declaration in this scope;
173 if NULL, the type is the type of the ->decl field. This is only of
174 relevance for objects with external or internal linkage which may
175 be redeclared in inner scopes, forming composite types that only
176 persist for the duration of those scopes. In the external scope,
177 this stores the composite of all the types declared for this
178 object, visible or not. The ->inner_comp field (used only at file
179 scope) stores whether an incomplete array type at file scope was
180 completed at an inner scope to an array size other than 1.
182 The depth field is copied from the scope structure that holds this
183 decl. It is used to preserve the proper ordering of the ->shadowed
184 field (see bind()) and also for a handful of special-case checks.
185 Finally, the invisible bit is true for a decl which should be
186 ignored for purposes of normal name lookup, and the nested bit is
187 true for a decl that's been bound a second time in an inner scope;
188 in all such cases, the binding in the outer scope will have its
189 invisible bit true. */
191 struct c_binding
GTY((chain_next ("%h.prev")))
193 tree decl
; /* the decl bound */
194 tree type
; /* the type in this scope */
195 tree id
; /* the identifier it's bound to */
196 struct c_binding
*prev
; /* the previous decl in this scope */
197 struct c_binding
*shadowed
; /* the innermost decl shadowed by this one */
198 unsigned int depth
: 28; /* depth of this scope */
199 BOOL_BITFIELD invisible
: 1; /* normal lookup should ignore this binding */
200 BOOL_BITFIELD nested
: 1; /* do not set DECL_CONTEXT when popping */
201 BOOL_BITFIELD inner_comp
: 1; /* incomplete array completed in inner scope */
204 #define B_IN_SCOPE(b1, b2) ((b1)->depth == (b2)->depth)
205 #define B_IN_CURRENT_SCOPE(b) ((b)->depth == current_scope->depth)
206 #define B_IN_FILE_SCOPE(b) ((b)->depth == 1 /*file_scope->depth*/)
207 #define B_IN_EXTERNAL_SCOPE(b) ((b)->depth == 0 /*external_scope->depth*/)
209 #define I_SYMBOL_BINDING(node) \
210 (((struct lang_identifier *)IDENTIFIER_NODE_CHECK(node))->symbol_binding)
211 #define I_SYMBOL_DECL(node) \
212 (I_SYMBOL_BINDING(node) ? I_SYMBOL_BINDING(node)->decl : 0)
214 #define I_TAG_BINDING(node) \
215 (((struct lang_identifier *)IDENTIFIER_NODE_CHECK(node))->tag_binding)
216 #define I_TAG_DECL(node) \
217 (I_TAG_BINDING(node) ? I_TAG_BINDING(node)->decl : 0)
219 #define I_LABEL_BINDING(node) \
220 (((struct lang_identifier *)IDENTIFIER_NODE_CHECK(node))->label_binding)
221 #define I_LABEL_DECL(node) \
222 (I_LABEL_BINDING(node) ? I_LABEL_BINDING(node)->decl : 0)
224 /* Each C symbol points to three linked lists of c_binding structures.
225 These describe the values of the identifier in the three different
226 namespaces defined by the language. */
228 struct lang_identifier
GTY(())
230 struct c_common_identifier common_id
;
231 struct c_binding
*symbol_binding
; /* vars, funcs, constants, typedefs */
232 struct c_binding
*tag_binding
; /* struct/union/enum tags */
233 struct c_binding
*label_binding
; /* labels */
236 /* Validate c-lang.c's assumptions. */
237 extern char C_SIZEOF_STRUCT_LANG_IDENTIFIER_isnt_accurate
238 [(sizeof(struct lang_identifier
) == C_SIZEOF_STRUCT_LANG_IDENTIFIER
) ? 1 : -1];
240 /* The resulting tree type. */
243 GTY((desc ("TREE_CODE (&%h.generic) == IDENTIFIER_NODE"),
244 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)")))
246 union tree_node
GTY ((tag ("0"),
247 desc ("tree_node_structure (&%h)")))
249 struct lang_identifier
GTY ((tag ("1"))) identifier
;
252 /* Each c_scope structure describes the complete contents of one
253 scope. Four scopes are distinguished specially: the innermost or
254 current scope, the innermost function scope, the file scope (always
255 the second to outermost) and the outermost or external scope.
257 Most declarations are recorded in the current scope.
259 All normal label declarations are recorded in the innermost
260 function scope, as are bindings of undeclared identifiers to
261 error_mark_node. (GCC permits nested functions as an extension,
262 hence the 'innermost' qualifier.) Explicitly declared labels
263 (using the __label__ extension) appear in the current scope.
265 Being in the file scope (current_scope == file_scope) causes
266 special behavior in several places below. Also, under some
267 conditions the Objective-C front end records declarations in the
268 file scope even though that isn't the current scope.
270 All declarations with external linkage are recorded in the external
271 scope, even if they aren't visible there; this models the fact that
272 such declarations are visible to the entire program, and (with a
273 bit of cleverness, see pushdecl) allows diagnosis of some violations
274 of C99 6.2.2p7 and 6.2.7p2:
276 If, within the same translation unit, the same identifier appears
277 with both internal and external linkage, the behavior is
280 All declarations that refer to the same object or function shall
281 have compatible type; otherwise, the behavior is undefined.
283 Initially only the built-in declarations, which describe compiler
284 intrinsic functions plus a subset of the standard library, are in
287 The order of the blocks list matters, and it is frequently appended
288 to. To avoid having to walk all the way to the end of the list on
289 each insertion, or reverse the list later, we maintain a pointer to
290 the last list entry. (FIXME: It should be feasible to use a reversed
293 The bindings list is strictly in reverse order of declarations;
294 pop_scope relies on this. */
297 struct c_scope
GTY((chain_next ("%h.outer")))
299 /* The scope containing this one. */
300 struct c_scope
*outer
;
302 /* The next outermost function scope. */
303 struct c_scope
*outer_function
;
305 /* All bindings in this scope. */
306 struct c_binding
*bindings
;
308 /* For each scope (except the global one), a chain of BLOCK nodes
309 for all the scopes that were entered and exited one level down. */
313 /* The depth of this scope. Used to keep the ->shadowed chain of
314 bindings sorted innermost to outermost. */
315 unsigned int depth
: 28;
317 /* True if we are currently filling this scope with parameter
319 BOOL_BITFIELD parm_flag
: 1;
321 /* True if we already complained about forward parameter decls
322 in this scope. This prevents double warnings on
323 foo (int a; int b; ...) */
324 BOOL_BITFIELD warned_forward_parm_decls
: 1;
326 /* True if this is the outermost block scope of a function body.
327 This scope contains the parameters, the local variables declared
328 in the outermost block, and all the labels (except those in
329 nested functions, or declared at block scope with __label__). */
330 BOOL_BITFIELD function_body
: 1;
332 /* True means make a BLOCK for this scope no matter what. */
333 BOOL_BITFIELD keep
: 1;
336 /* The scope currently in effect. */
338 static GTY(()) struct c_scope
*current_scope
;
340 /* The innermost function scope. Ordinary (not explicitly declared)
341 labels, bindings to error_mark_node, and the lazily-created
342 bindings of __func__ and its friends get this scope. */
344 static GTY(()) struct c_scope
*current_function_scope
;
346 /* The C file scope. This is reset for each input translation unit. */
348 static GTY(()) struct c_scope
*file_scope
;
350 /* The outermost scope. This is used for all declarations with
351 external linkage, and only these, hence the name. */
353 static GTY(()) struct c_scope
*external_scope
;
355 /* A chain of c_scope structures awaiting reuse. */
357 static GTY((deletable
)) struct c_scope
*scope_freelist
;
359 /* A chain of c_binding structures awaiting reuse. */
361 static GTY((deletable
)) struct c_binding
*binding_freelist
;
363 /* Append VAR to LIST in scope SCOPE. */
364 #define SCOPE_LIST_APPEND(scope, list, decl) do { \
365 struct c_scope *s_ = (scope); \
367 if (s_->list##_last) \
368 TREE_CHAIN (s_->list##_last) = d_; \
371 s_->list##_last = d_; \
374 /* Concatenate FROM in scope FSCOPE onto TO in scope TSCOPE. */
375 #define SCOPE_LIST_CONCAT(tscope, to, fscope, from) do { \
376 struct c_scope *t_ = (tscope); \
377 struct c_scope *f_ = (fscope); \
379 TREE_CHAIN (t_->to##_last) = f_->from; \
382 t_->to##_last = f_->from##_last; \
385 /* True means unconditionally make a BLOCK for the next scope pushed. */
387 static bool keep_next_level_flag
;
389 /* True means the next call to push_scope will be the outermost scope
390 of a function body, so do not push a new scope, merely cease
391 expecting parameter decls. */
393 static bool next_is_function_body
;
395 /* Functions called automatically at the beginning and end of execution. */
397 static GTY(()) tree static_ctors
;
398 static GTY(()) tree static_dtors
;
400 /* Forward declarations. */
401 static tree
lookup_name_in_scope (tree
, struct c_scope
*);
402 static tree
c_make_fname_decl (tree
, int);
403 static tree
grokdeclarator (tree
, tree
, enum decl_context
, bool, tree
*);
404 static tree
grokparms (tree
, 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 '%D' 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 `%D' 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 `%D' defined but not used", p
, p
);
729 warning ("%Jlabel `%D' 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 `%D'", 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 '%D' declares more arguments "
1054 "than previous old-style definition", newdecl
, newdecl
);
1057 else if (END_OF_ARGLIST (newargtype
))
1059 error ("%Jprototype for '%D' 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 '%D' 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 '%D' 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 '%D' was here"), decl
, decl
);
1096 else if (C_DECL_IMPLICIT (decl
))
1097 diag (N_("%Jprevious implicit declaration of '%D' was here"), decl
, decl
);
1099 diag (N_("%Jprevious declaration of '%D' 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'%D' redeclared as different kind of symbol",
1137 locate_old_decl (olddecl
, error
);
1139 else if (TREE_PUBLIC (newdecl
))
1140 warning ("%Jbuilt-in function '%D' declared as non-function",
1142 else if (warn_shadow
)
1143 warning ("%Jdeclaration of '%D' shadows a built-in function",
1148 if (!comptypes (oldtype
, newtype
))
1150 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1151 && DECL_BUILT_IN (olddecl
) && !C_DECL_DECLARED_BUILTIN (olddecl
))
1153 /* Accept harmless mismatch in function types.
1154 This is for the ffs and fprintf builtins. */
1155 tree trytype
= match_builtin_function_types (newtype
, oldtype
);
1157 if (trytype
&& comptypes (newtype
, trytype
))
1158 *oldtypep
= oldtype
= trytype
;
1161 /* If types don't match for a built-in, throw away the
1162 built-in. No point in calling locate_old_decl here, it
1163 won't print anything. */
1164 warning ("%Jconflicting types for built-in function '%D'",
1169 else if (TREE_CODE (olddecl
) == FUNCTION_DECL
1170 && DECL_IS_BUILTIN (olddecl
))
1172 /* A conflicting function declaration for a predeclared
1173 function that isn't actually built in. Objective C uses
1174 these. The new declaration silently overrides everything
1175 but the volatility (i.e. noreturn) indication. See also
1176 below. FIXME: Make Objective C use normal builtins. */
1177 TREE_THIS_VOLATILE (newdecl
) |= TREE_THIS_VOLATILE (olddecl
);
1180 /* Permit void foo (...) to match int foo (...) if the latter is
1181 the definition and implicit int was used. See
1182 c-torture/compile/920625-2.c. */
1183 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
&& DECL_INITIAL (newdecl
)
1184 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype
)) == void_type_node
1185 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype
)) == integer_type_node
1186 && C_FUNCTION_IMPLICIT_INT (newdecl
))
1188 pedwarn ("%Jconflicting types for '%D'", newdecl
, newdecl
);
1189 /* Make sure we keep void as the return type. */
1190 TREE_TYPE (newdecl
) = *newtypep
= newtype
= oldtype
;
1191 C_FUNCTION_IMPLICIT_INT (newdecl
) = 0;
1196 if (TYPE_QUALS (newtype
) != TYPE_QUALS (oldtype
))
1197 error ("%J conflicting type qualifiers for '%D'", newdecl
, newdecl
);
1199 error ("%Jconflicting types for '%D'", newdecl
, newdecl
);
1200 diagnose_arglist_conflict (newdecl
, olddecl
, newtype
, oldtype
);
1201 locate_old_decl (olddecl
, error
);
1206 /* Redeclaration of a type is a constraint violation (6.7.2.3p1),
1207 but silently ignore the redeclaration if either is in a system
1208 header. (Conflicting redeclarations were handled above.) */
1209 if (TREE_CODE (newdecl
) == TYPE_DECL
)
1211 if (DECL_IN_SYSTEM_HEADER (newdecl
) || DECL_IN_SYSTEM_HEADER (olddecl
))
1212 return true; /* Allow OLDDECL to continue in use. */
1214 error ("%Jredefinition of typedef '%D'", newdecl
, newdecl
);
1215 locate_old_decl (olddecl
, error
);
1219 /* Function declarations can either be 'static' or 'extern' (no
1220 qualifier is equivalent to 'extern' - C99 6.2.2p5) and therefore
1221 can never conflict with each other on account of linkage (6.2.2p4).
1222 Multiple definitions are not allowed (6.9p3,5) but GCC permits
1223 two definitions if one is 'extern inline' and one is not. The non-
1224 extern-inline definition supersedes the extern-inline definition. */
1225 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1227 /* If you declare a built-in function name as static, or
1228 define the built-in with an old-style definition (so we
1229 can't validate the argument list) the built-in definition is
1230 overridden, but optionally warn this was a bad choice of name. */
1231 if (DECL_BUILT_IN (olddecl
)
1232 && !C_DECL_DECLARED_BUILTIN (olddecl
)
1233 && (!TREE_PUBLIC (newdecl
)
1234 || (DECL_INITIAL (newdecl
)
1235 && !TYPE_ARG_TYPES (TREE_TYPE (newdecl
)))))
1238 warning ("%Jdeclaration of '%D' shadows a built-in function",
1240 /* Discard the old built-in function. */
1244 if (DECL_INITIAL (newdecl
))
1246 if (DECL_INITIAL (olddecl
)
1247 && !(DECL_DECLARED_INLINE_P (olddecl
)
1248 && DECL_EXTERNAL (olddecl
)
1249 && !(DECL_DECLARED_INLINE_P (newdecl
)
1250 && DECL_EXTERNAL (newdecl
)
1251 && same_translation_unit_p (olddecl
, newdecl
))))
1253 error ("%Jredefinition of '%D'", newdecl
, newdecl
);
1254 locate_old_decl (olddecl
, error
);
1258 /* If we have a prototype after an old-style function definition,
1259 the argument types must be checked specially. */
1260 else if (DECL_INITIAL (olddecl
)
1261 && !TYPE_ARG_TYPES (oldtype
) && TYPE_ARG_TYPES (newtype
)
1262 && TYPE_ACTUAL_ARG_TYPES (oldtype
)
1263 && !validate_proto_after_old_defn (newdecl
, newtype
, oldtype
))
1265 locate_old_decl (olddecl
, error
);
1268 /* A non-static declaration (even an "extern") followed by a
1269 static declaration is undefined behavior per C99 6.2.2p3-5,7.
1270 The same is true for a static forward declaration at block
1271 scope followed by a non-static declaration/definition at file
1272 scope. Static followed by non-static at the same scope is
1273 not undefined behavior, and is the most convenient way to get
1274 some effects (see e.g. what unwind-dw2-fde-glibc.c does to
1275 the definition of _Unwind_Find_FDE in unwind-dw2-fde.c), but
1276 we do diagnose it if -Wtraditional. */
1277 if (TREE_PUBLIC (olddecl
) && !TREE_PUBLIC (newdecl
))
1279 /* Two exceptions to the rule. If olddecl is an extern
1280 inline, or a predeclared function that isn't actually
1281 built in, newdecl silently overrides olddecl. The latter
1282 occur only in Objective C; see also above. (FIXME: Make
1283 Objective C use normal builtins.) */
1284 if (!DECL_IS_BUILTIN (olddecl
)
1285 && !(DECL_EXTERNAL (olddecl
)
1286 && DECL_DECLARED_INLINE_P (olddecl
)))
1288 error ("%Jstatic declaration of '%D' follows "
1289 "non-static declaration", newdecl
, newdecl
);
1290 locate_old_decl (olddecl
, error
);
1294 else if (TREE_PUBLIC (newdecl
) && !TREE_PUBLIC (olddecl
))
1296 if (DECL_CONTEXT (olddecl
))
1298 error ("%Jnon-static declaration of '%D' follows "
1299 "static declaration", newdecl
, newdecl
);
1300 locate_old_decl (olddecl
, error
);
1303 else if (warn_traditional
)
1305 warning ("%Jnon-static declaration of '%D' follows "
1306 "static declaration", newdecl
, newdecl
);
1311 else if (TREE_CODE (newdecl
) == VAR_DECL
)
1313 /* Only variables can be thread-local, and all declarations must
1314 agree on this property. */
1315 if (DECL_THREAD_LOCAL (newdecl
) != DECL_THREAD_LOCAL (olddecl
))
1317 if (DECL_THREAD_LOCAL (newdecl
))
1318 error ("%Jthread-local declaration of '%D' follows "
1319 "non-thread-local declaration", newdecl
, newdecl
);
1321 error ("%Jnon-thread-local declaration of '%D' follows "
1322 "thread-local declaration", newdecl
, newdecl
);
1324 locate_old_decl (olddecl
, error
);
1328 /* Multiple initialized definitions are not allowed (6.9p3,5). */
1329 if (DECL_INITIAL (newdecl
) && DECL_INITIAL (olddecl
))
1331 error ("%Jredefinition of '%D'", newdecl
, newdecl
);
1332 locate_old_decl (olddecl
, error
);
1336 /* Objects declared at file scope: if the first declaration had
1337 external linkage (even if it was an external reference) the
1338 second must have external linkage as well, or the behavior is
1339 undefined. If the first declaration had internal linkage, then
1340 the second must too, or else be an external reference (in which
1341 case the composite declaration still has internal linkage).
1342 As for function declarations, we warn about the static-then-
1343 extern case only for -Wtraditional. See generally 6.2.2p3-5,7. */
1344 if (DECL_FILE_SCOPE_P (newdecl
)
1345 && TREE_PUBLIC (newdecl
) != TREE_PUBLIC (olddecl
))
1347 if (DECL_EXTERNAL (newdecl
))
1349 if (!DECL_FILE_SCOPE_P (olddecl
))
1351 error ("%Jextern declaration of %qD follows "
1352 "declaration with no linkage", newdecl
, newdecl
);
1353 locate_old_decl (olddecl
, error
);
1356 else if (warn_traditional
)
1358 warning ("%Jnon-static declaration of '%D' follows "
1359 "static declaration", newdecl
, newdecl
);
1365 if (TREE_PUBLIC (newdecl
))
1366 error ("%Jnon-static declaration of '%D' follows "
1367 "static declaration", newdecl
, newdecl
);
1369 error ("%Jstatic declaration of '%D' follows "
1370 "non-static declaration", newdecl
, newdecl
);
1372 locate_old_decl (olddecl
, error
);
1376 /* Two objects with the same name declared at the same block
1377 scope must both be external references (6.7p3). */
1378 else if (!DECL_FILE_SCOPE_P (newdecl
))
1380 if (DECL_EXTERNAL (newdecl
))
1382 /* Extern with initializer at block scope, which will
1383 already have received an error. */
1385 else if (DECL_EXTERNAL (olddecl
))
1387 error ("%Jdeclaration of '%D' with no linkage follows "
1388 "extern declaration", newdecl
, newdecl
);
1389 locate_old_decl (olddecl
, error
);
1393 error ("%Jredeclaration of '%D' with no linkage",
1395 locate_old_decl (olddecl
, error
);
1403 /* All decls must agree on a visibility. */
1404 if (DECL_VISIBILITY_SPECIFIED (newdecl
) && DECL_VISIBILITY_SPECIFIED (olddecl
)
1405 && DECL_VISIBILITY (newdecl
) != DECL_VISIBILITY (olddecl
))
1407 warning ("%Jredeclaration of '%D' with different visibility "
1408 "(old visibility preserved)", newdecl
, newdecl
);
1412 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1414 /* Diagnose inline __attribute__ ((noinline)) which is silly. */
1415 if (DECL_DECLARED_INLINE_P (newdecl
)
1416 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl
)))
1418 warning ("%Jinline declaration of '%D' follows "
1419 "declaration with attribute noinline", newdecl
, newdecl
);
1422 else if (DECL_DECLARED_INLINE_P (olddecl
)
1423 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl
)))
1425 warning ("%Jdeclaration of '%D' with attribute noinline follows "
1426 "inline declaration ", newdecl
, newdecl
);
1430 /* Inline declaration after use or definition.
1431 ??? Should we still warn about this now we have unit-at-a-time
1432 mode and can get it right?
1433 Definitely don't complain if the decls are in different translation
1435 if (DECL_DECLARED_INLINE_P (newdecl
) && !DECL_DECLARED_INLINE_P (olddecl
)
1436 && same_translation_unit_p (olddecl
, newdecl
))
1438 if (TREE_USED (olddecl
))
1440 warning ("%J'%D' declared inline after being called",
1444 else if (DECL_INITIAL (olddecl
))
1446 warning ("%J'%D' declared inline after its definition",
1452 else /* PARM_DECL, VAR_DECL */
1454 /* Redeclaration of a parameter is a constraint violation (this is
1455 not explicitly stated, but follows from C99 6.7p3 [no more than
1456 one declaration of the same identifier with no linkage in the
1457 same scope, except type tags] and 6.2.2p6 [parameters have no
1458 linkage]). We must check for a forward parameter declaration,
1459 indicated by TREE_ASM_WRITTEN on the old declaration - this is
1460 an extension, the mandatory diagnostic for which is handled by
1461 mark_forward_parm_decls. */
1463 if (TREE_CODE (newdecl
) == PARM_DECL
1464 && (!TREE_ASM_WRITTEN (olddecl
) || TREE_ASM_WRITTEN (newdecl
)))
1466 error ("%Jredefinition of parameter '%D'", newdecl
, newdecl
);
1467 locate_old_decl (olddecl
, error
);
1472 /* Optional warning for completely redundant decls. */
1473 if (!warned
&& !pedwarned
1474 && warn_redundant_decls
1475 /* Don't warn about a function declaration followed by a
1477 && !(TREE_CODE (newdecl
) == FUNCTION_DECL
1478 && DECL_INITIAL (newdecl
) && !DECL_INITIAL (olddecl
))
1479 /* Don't warn about redundant redeclarations of builtins. */
1480 && !(TREE_CODE (newdecl
) == FUNCTION_DECL
1481 && !DECL_BUILT_IN (newdecl
)
1482 && DECL_BUILT_IN (olddecl
)
1483 && !C_DECL_DECLARED_BUILTIN (olddecl
))
1484 /* Don't warn about an extern followed by a definition. */
1485 && !(DECL_EXTERNAL (olddecl
) && !DECL_EXTERNAL (newdecl
))
1486 /* Don't warn about forward parameter decls. */
1487 && !(TREE_CODE (newdecl
) == PARM_DECL
1488 && TREE_ASM_WRITTEN (olddecl
) && !TREE_ASM_WRITTEN (newdecl
)))
1490 warning ("%Jredundant redeclaration of '%D'", newdecl
, newdecl
);
1494 /* Report location of previous decl/defn in a consistent manner. */
1495 if (warned
|| pedwarned
)
1496 locate_old_decl (olddecl
, pedwarned
? pedwarn
: warning
);
1501 /* Subroutine of duplicate_decls. NEWDECL has been found to be
1502 consistent with OLDDECL, but carries new information. Merge the
1503 new information into OLDDECL. This function issues no
1507 merge_decls (tree newdecl
, tree olddecl
, tree newtype
, tree oldtype
)
1509 int new_is_definition
= (TREE_CODE (newdecl
) == FUNCTION_DECL
1510 && DECL_INITIAL (newdecl
) != 0);
1512 /* For real parm decl following a forward decl, rechain the old decl
1513 in its new location and clear TREE_ASM_WRITTEN (it's not a
1514 forward decl anymore). */
1515 if (TREE_CODE (newdecl
) == PARM_DECL
1516 && TREE_ASM_WRITTEN (olddecl
) && ! TREE_ASM_WRITTEN (newdecl
))
1518 struct c_binding
*b
, **here
;
1520 for (here
= ¤t_scope
->bindings
; *here
; here
= &(*here
)->prev
)
1521 if ((*here
)->decl
== olddecl
)
1528 b
->prev
= current_scope
->bindings
;
1529 current_scope
->bindings
= b
;
1531 TREE_ASM_WRITTEN (olddecl
) = 0;
1534 DECL_ATTRIBUTES (newdecl
)
1535 = targetm
.merge_decl_attributes (olddecl
, newdecl
);
1537 /* Merge the data types specified in the two decls. */
1539 = TREE_TYPE (olddecl
)
1540 = composite_type (newtype
, oldtype
);
1542 /* Lay the type out, unless already done. */
1543 if (oldtype
!= TREE_TYPE (newdecl
))
1545 if (TREE_TYPE (newdecl
) != error_mark_node
)
1546 layout_type (TREE_TYPE (newdecl
));
1547 if (TREE_CODE (newdecl
) != FUNCTION_DECL
1548 && TREE_CODE (newdecl
) != TYPE_DECL
1549 && TREE_CODE (newdecl
) != CONST_DECL
)
1550 layout_decl (newdecl
, 0);
1554 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1555 DECL_SIZE (newdecl
) = DECL_SIZE (olddecl
);
1556 DECL_SIZE_UNIT (newdecl
) = DECL_SIZE_UNIT (olddecl
);
1557 DECL_MODE (newdecl
) = DECL_MODE (olddecl
);
1558 if (TREE_CODE (olddecl
) != FUNCTION_DECL
)
1559 if (DECL_ALIGN (olddecl
) > DECL_ALIGN (newdecl
))
1561 DECL_ALIGN (newdecl
) = DECL_ALIGN (olddecl
);
1562 DECL_USER_ALIGN (newdecl
) |= DECL_ALIGN (olddecl
);
1566 /* Keep the old rtl since we can safely use it. */
1567 COPY_DECL_RTL (olddecl
, newdecl
);
1569 /* Merge the type qualifiers. */
1570 if (TREE_READONLY (newdecl
))
1571 TREE_READONLY (olddecl
) = 1;
1573 if (TREE_THIS_VOLATILE (newdecl
))
1575 TREE_THIS_VOLATILE (olddecl
) = 1;
1576 if (TREE_CODE (newdecl
) == VAR_DECL
)
1577 make_var_volatile (newdecl
);
1580 /* Keep source location of definition rather than declaration. */
1581 if (DECL_INITIAL (newdecl
) == 0 && DECL_INITIAL (olddecl
) != 0)
1582 DECL_SOURCE_LOCATION (newdecl
) = DECL_SOURCE_LOCATION (olddecl
);
1584 /* Merge the unused-warning information. */
1585 if (DECL_IN_SYSTEM_HEADER (olddecl
))
1586 DECL_IN_SYSTEM_HEADER (newdecl
) = 1;
1587 else if (DECL_IN_SYSTEM_HEADER (newdecl
))
1588 DECL_IN_SYSTEM_HEADER (olddecl
) = 1;
1590 /* Merge the initialization information. */
1591 if (DECL_INITIAL (newdecl
) == 0)
1592 DECL_INITIAL (newdecl
) = DECL_INITIAL (olddecl
);
1594 /* Merge the section attribute.
1595 We want to issue an error if the sections conflict but that must be
1596 done later in decl_attributes since we are called before attributes
1598 if (DECL_SECTION_NAME (newdecl
) == NULL_TREE
)
1599 DECL_SECTION_NAME (newdecl
) = DECL_SECTION_NAME (olddecl
);
1601 /* Copy the assembler name.
1602 Currently, it can only be defined in the prototype. */
1603 COPY_DECL_ASSEMBLER_NAME (olddecl
, newdecl
);
1605 /* Use visibility of whichever declaration had it specified */
1606 if (DECL_VISIBILITY_SPECIFIED (olddecl
))
1608 DECL_VISIBILITY (newdecl
) = DECL_VISIBILITY (olddecl
);
1609 DECL_VISIBILITY_SPECIFIED (newdecl
) = 1;
1612 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1614 DECL_STATIC_CONSTRUCTOR(newdecl
) |= DECL_STATIC_CONSTRUCTOR(olddecl
);
1615 DECL_STATIC_DESTRUCTOR (newdecl
) |= DECL_STATIC_DESTRUCTOR (olddecl
);
1616 DECL_NO_LIMIT_STACK (newdecl
) |= DECL_NO_LIMIT_STACK (olddecl
);
1617 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl
)
1618 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl
);
1619 TREE_THIS_VOLATILE (newdecl
) |= TREE_THIS_VOLATILE (olddecl
);
1620 TREE_READONLY (newdecl
) |= TREE_READONLY (olddecl
);
1621 DECL_IS_MALLOC (newdecl
) |= DECL_IS_MALLOC (olddecl
);
1622 DECL_IS_PURE (newdecl
) |= DECL_IS_PURE (olddecl
);
1625 /* Merge the storage class information. */
1626 merge_weak (newdecl
, olddecl
);
1628 /* For functions, static overrides non-static. */
1629 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1631 TREE_PUBLIC (newdecl
) &= TREE_PUBLIC (olddecl
);
1632 /* This is since we don't automatically
1633 copy the attributes of NEWDECL into OLDDECL. */
1634 TREE_PUBLIC (olddecl
) = TREE_PUBLIC (newdecl
);
1635 /* If this clears `static', clear it in the identifier too. */
1636 if (! TREE_PUBLIC (olddecl
))
1637 TREE_PUBLIC (DECL_NAME (olddecl
)) = 0;
1639 if (DECL_EXTERNAL (newdecl
))
1641 TREE_STATIC (newdecl
) = TREE_STATIC (olddecl
);
1642 DECL_EXTERNAL (newdecl
) = DECL_EXTERNAL (olddecl
);
1644 /* An extern decl does not override previous storage class. */
1645 TREE_PUBLIC (newdecl
) = TREE_PUBLIC (olddecl
);
1646 if (! DECL_EXTERNAL (newdecl
))
1648 DECL_CONTEXT (newdecl
) = DECL_CONTEXT (olddecl
);
1649 DECL_COMMON (newdecl
) = DECL_COMMON (olddecl
);
1654 TREE_STATIC (olddecl
) = TREE_STATIC (newdecl
);
1655 TREE_PUBLIC (olddecl
) = TREE_PUBLIC (newdecl
);
1658 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1660 /* If we're redefining a function previously defined as extern
1661 inline, make sure we emit debug info for the inline before we
1662 throw it away, in case it was inlined into a function that hasn't
1663 been written out yet. */
1664 if (new_is_definition
&& DECL_INITIAL (olddecl
))
1666 if (TREE_USED (olddecl
)
1667 /* In unit-at-a-time mode we never inline re-defined extern
1668 inline functions. */
1669 && !flag_unit_at_a_time
1670 && cgraph_function_possibly_inlined_p (olddecl
))
1671 (*debug_hooks
->outlining_inline_function
) (olddecl
);
1673 /* The new defn must not be inline. */
1674 DECL_INLINE (newdecl
) = 0;
1675 DECL_UNINLINABLE (newdecl
) = 1;
1679 /* If either decl says `inline', this fn is inline,
1680 unless its definition was passed already. */
1681 if (DECL_DECLARED_INLINE_P (newdecl
)
1682 || DECL_DECLARED_INLINE_P (olddecl
))
1683 DECL_DECLARED_INLINE_P (newdecl
) = 1;
1685 DECL_UNINLINABLE (newdecl
) = DECL_UNINLINABLE (olddecl
)
1686 = (DECL_UNINLINABLE (newdecl
) || DECL_UNINLINABLE (olddecl
));
1689 if (DECL_BUILT_IN (olddecl
))
1691 /* If redeclaring a builtin function, it stays built in.
1692 But it gets tagged as having been declared. */
1693 DECL_BUILT_IN_CLASS (newdecl
) = DECL_BUILT_IN_CLASS (olddecl
);
1694 DECL_FUNCTION_CODE (newdecl
) = DECL_FUNCTION_CODE (olddecl
);
1695 C_DECL_DECLARED_BUILTIN (newdecl
) = 1;
1698 /* Also preserve various other info from the definition. */
1699 if (! new_is_definition
)
1701 DECL_RESULT (newdecl
) = DECL_RESULT (olddecl
);
1702 DECL_INITIAL (newdecl
) = DECL_INITIAL (olddecl
);
1703 DECL_STRUCT_FUNCTION (newdecl
) = DECL_STRUCT_FUNCTION (olddecl
);
1704 DECL_SAVED_TREE (newdecl
) = DECL_SAVED_TREE (olddecl
);
1705 DECL_ARGUMENTS (newdecl
) = DECL_ARGUMENTS (olddecl
);
1707 /* Set DECL_INLINE on the declaration if we've got a body
1708 from which to instantiate. */
1709 if (DECL_INLINE (olddecl
) && ! DECL_UNINLINABLE (newdecl
))
1711 DECL_INLINE (newdecl
) = 1;
1712 DECL_ABSTRACT_ORIGIN (newdecl
)
1713 = DECL_ABSTRACT_ORIGIN (olddecl
);
1718 /* If a previous declaration said inline, mark the
1719 definition as inlinable. */
1720 if (DECL_DECLARED_INLINE_P (newdecl
)
1721 && ! DECL_UNINLINABLE (newdecl
))
1722 DECL_INLINE (newdecl
) = 1;
1726 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
1727 But preserve OLDDECL's DECL_UID and DECL_CONTEXT. */
1729 unsigned olddecl_uid
= DECL_UID (olddecl
);
1730 tree olddecl_context
= DECL_CONTEXT (olddecl
);
1732 memcpy ((char *) olddecl
+ sizeof (struct tree_common
),
1733 (char *) newdecl
+ sizeof (struct tree_common
),
1734 sizeof (struct tree_decl
) - sizeof (struct tree_common
));
1735 DECL_UID (olddecl
) = olddecl_uid
;
1736 DECL_CONTEXT (olddecl
) = olddecl_context
;
1739 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
1740 so that encode_section_info has a chance to look at the new decl
1741 flags and attributes. */
1742 if (DECL_RTL_SET_P (olddecl
)
1743 && (TREE_CODE (olddecl
) == FUNCTION_DECL
1744 || (TREE_CODE (olddecl
) == VAR_DECL
1745 && TREE_STATIC (olddecl
))))
1746 make_decl_rtl (olddecl
);
1749 /* Handle when a new declaration NEWDECL has the same name as an old
1750 one OLDDECL in the same binding contour. Prints an error message
1753 If safely possible, alter OLDDECL to look like NEWDECL, and return
1754 true. Otherwise, return false. */
1757 duplicate_decls (tree newdecl
, tree olddecl
)
1759 tree newtype
= NULL
, oldtype
= NULL
;
1761 if (!diagnose_mismatched_decls (newdecl
, olddecl
, &newtype
, &oldtype
))
1764 merge_decls (newdecl
, olddecl
, newtype
, oldtype
);
1769 /* Check whether decl-node NEW_DECL shadows an existing declaration. */
1771 warn_if_shadowing (tree new_decl
)
1773 struct c_binding
*b
;
1775 /* Shadow warnings wanted? */
1777 /* No shadow warnings for internally generated vars. */
1778 || DECL_IS_BUILTIN (new_decl
)
1779 /* No shadow warnings for vars made for inlining. */
1780 || DECL_FROM_INLINE (new_decl
)
1781 /* Don't warn about the parm names in function declarator
1782 within a function declarator. It would be nice to avoid
1783 warning in any function declarator in a declaration, as
1784 opposed to a definition, but there is no way to tell
1785 it's not a definition at this point. */
1786 || (TREE_CODE (new_decl
) == PARM_DECL
&& current_scope
->outer
->parm_flag
))
1789 /* Is anything being shadowed? Invisible decls do not count. */
1790 for (b
= I_SYMBOL_BINDING (DECL_NAME (new_decl
)); b
; b
= b
->shadowed
)
1791 if (b
->decl
&& b
->decl
!= new_decl
&& !b
->invisible
)
1793 tree old_decl
= b
->decl
;
1795 if (TREE_CODE (old_decl
) == PARM_DECL
)
1796 warning ("%Jdeclaration of '%D' shadows a parameter",
1797 new_decl
, new_decl
);
1798 else if (DECL_FILE_SCOPE_P (old_decl
))
1799 warning ("%Jdeclaration of '%D' shadows a global declaration",
1800 new_decl
, new_decl
);
1801 else if (TREE_CODE (old_decl
) == FUNCTION_DECL
1802 && DECL_BUILT_IN (old_decl
))
1803 warning ("%Jdeclaration of '%D' shadows a built-in function",
1804 new_decl
, new_decl
);
1806 warning ("%Jdeclaration of '%D' shadows a previous local",
1807 new_decl
, new_decl
);
1809 if (TREE_CODE (old_decl
) != FUNCTION_DECL
1810 || ! DECL_BUILT_IN (old_decl
))
1811 warning ("%Jshadowed declaration is here", old_decl
);
1818 /* Subroutine of pushdecl.
1820 X is a TYPE_DECL for a typedef statement. Create a brand new
1821 ..._TYPE node (which will be just a variant of the existing
1822 ..._TYPE node with identical properties) and then install X
1823 as the TYPE_NAME of this brand new (duplicate) ..._TYPE node.
1825 The whole point here is to end up with a situation where each
1826 and every ..._TYPE node the compiler creates will be uniquely
1827 associated with AT MOST one node representing a typedef name.
1828 This way, even though the compiler substitutes corresponding
1829 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
1830 early on, later parts of the compiler can always do the reverse
1831 translation and get back the corresponding typedef name. For
1834 typedef struct S MY_TYPE;
1837 Later parts of the compiler might only know that `object' was of
1838 type `struct S' if it were not for code just below. With this
1839 code however, later parts of the compiler see something like:
1841 struct S' == struct S
1842 typedef struct S' MY_TYPE;
1845 And they can then deduce (from the node for type struct S') that
1846 the original object declaration was:
1850 Being able to do this is important for proper support of protoize,
1851 and also for generating precise symbolic debugging information
1852 which takes full account of the programmer's (typedef) vocabulary.
1854 Obviously, we don't want to generate a duplicate ..._TYPE node if
1855 the TYPE_DECL node that we are now processing really represents a
1856 standard built-in type.
1858 Since all standard types are effectively declared at line zero
1859 in the source file, we can easily check to see if we are working
1860 on a standard type by checking the current value of lineno. */
1863 clone_underlying_type (tree x
)
1865 if (DECL_IS_BUILTIN (x
))
1867 if (TYPE_NAME (TREE_TYPE (x
)) == 0)
1868 TYPE_NAME (TREE_TYPE (x
)) = x
;
1870 else if (TREE_TYPE (x
) != error_mark_node
1871 && DECL_ORIGINAL_TYPE (x
) == NULL_TREE
)
1873 tree tt
= TREE_TYPE (x
);
1874 DECL_ORIGINAL_TYPE (x
) = tt
;
1875 tt
= build_variant_type_copy (tt
);
1877 TREE_USED (tt
) = TREE_USED (x
);
1882 /* Record a decl-node X as belonging to the current lexical scope.
1883 Check for errors (such as an incompatible declaration for the same
1884 name already seen in the same scope).
1886 Returns either X or an old decl for the same name.
1887 If an old decl is returned, it may have been smashed
1888 to agree with what X says. */
1893 tree name
= DECL_NAME (x
);
1894 struct c_scope
*scope
= current_scope
;
1895 struct c_binding
*b
;
1896 bool nested
= false;
1898 /* Functions need the lang_decl data. */
1899 if (TREE_CODE (x
) == FUNCTION_DECL
&& ! DECL_LANG_SPECIFIC (x
))
1900 DECL_LANG_SPECIFIC (x
) = GGC_CNEW (struct lang_decl
);
1902 /* Must set DECL_CONTEXT for everything not at file scope or
1903 DECL_FILE_SCOPE_P won't work. Local externs don't count
1904 unless they have initializers (which generate code). */
1905 if (current_function_decl
1906 && ((TREE_CODE (x
) != FUNCTION_DECL
&& TREE_CODE (x
) != VAR_DECL
)
1907 || DECL_INITIAL (x
) || !DECL_EXTERNAL (x
)))
1908 DECL_CONTEXT (x
) = current_function_decl
;
1910 /* Anonymous decls are just inserted in the scope. */
1913 bind (name
, x
, scope
, /*invisible=*/false, /*nested=*/false);
1917 /* First, see if there is another declaration with the same name in
1918 the current scope. If there is, duplicate_decls may do all the
1919 work for us. If duplicate_decls returns false, that indicates
1920 two incompatible decls in the same scope; we are to silently
1921 replace the old one (duplicate_decls has issued all appropriate
1922 diagnostics). In particular, we should not consider possible
1923 duplicates in the external scope, or shadowing. */
1924 b
= I_SYMBOL_BINDING (name
);
1925 if (b
&& B_IN_SCOPE (b
, scope
))
1927 if (TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
1928 && COMPLETE_TYPE_P (TREE_TYPE (x
)))
1929 b
->inner_comp
= false;
1930 if (duplicate_decls (x
, b
->decl
))
1933 goto skip_external_and_shadow_checks
;
1936 /* All declarations with external linkage, and all external
1937 references, go in the external scope, no matter what scope is
1938 current. However, the binding in that scope is ignored for
1939 purposes of normal name lookup. A separate binding structure is
1940 created in the requested scope; this governs the normal
1941 visibility of the symbol.
1943 The binding in the externals scope is used exclusively for
1944 detecting duplicate declarations of the same object, no matter
1945 what scope they are in; this is what we do here. (C99 6.2.7p2:
1946 All declarations that refer to the same object or function shall
1947 have compatible type; otherwise, the behavior is undefined.) */
1948 if (DECL_EXTERNAL (x
) || scope
== file_scope
)
1950 tree type
= TREE_TYPE (x
);
1953 bool type_saved
= false;
1954 if (b
&& !B_IN_EXTERNAL_SCOPE (b
)
1955 && (TREE_CODE (b
->decl
) == FUNCTION_DECL
1956 || TREE_CODE (b
->decl
) == VAR_DECL
)
1957 && DECL_FILE_SCOPE_P (b
->decl
))
1960 vistype
= TREE_TYPE (visdecl
);
1962 if (warn_nested_externs
1963 && scope
!= file_scope
1964 && !DECL_IN_SYSTEM_HEADER (x
))
1965 warning ("nested extern declaration of '%D'", x
);
1967 while (b
&& !B_IN_EXTERNAL_SCOPE (b
))
1969 /* If this decl might be modified, save its type. This is
1970 done here rather than when the decl is first bound
1971 because the type may change after first binding, through
1972 being completed or through attributes being added. If we
1973 encounter multiple such decls, only the first should have
1974 its type saved; the others will already have had their
1975 proper types saved and the types will not have changed as
1976 their scopes will not have been re-entered. */
1977 if (DECL_FILE_SCOPE_P (b
->decl
) && !type_saved
)
1979 b
->type
= TREE_TYPE (b
->decl
);
1982 if (B_IN_FILE_SCOPE (b
)
1983 && TREE_CODE (b
->decl
) == VAR_DECL
1984 && TREE_STATIC (b
->decl
)
1985 && TREE_CODE (TREE_TYPE (b
->decl
)) == ARRAY_TYPE
1986 && !TYPE_DOMAIN (TREE_TYPE (b
->decl
))
1987 && TREE_CODE (type
) == ARRAY_TYPE
1988 && TYPE_DOMAIN (type
)
1989 && TYPE_MAX_VALUE (TYPE_DOMAIN (type
))
1990 && !integer_zerop (TYPE_MAX_VALUE (TYPE_DOMAIN (type
))))
1992 /* Array type completed in inner scope, which should be
1993 diagnosed if the completion does not have size 1 and
1994 it does not get completed in the file scope. */
1995 b
->inner_comp
= true;
2000 /* If a matching external declaration has been found, set its
2001 type to the composite of all the types of that declaration.
2002 After the consistency checks, it will be reset to the
2003 composite of the visible types only. */
2004 if (b
&& (TREE_PUBLIC (x
) || same_translation_unit_p (x
, b
->decl
))
2006 TREE_TYPE (b
->decl
) = b
->type
;
2008 /* The point of the same_translation_unit_p check here is,
2009 we want to detect a duplicate decl for a construct like
2010 foo() { extern bar(); } ... static bar(); but not if
2011 they are in different translation units. In any case,
2012 the static does not go in the externals scope. */
2014 && (TREE_PUBLIC (x
) || same_translation_unit_p (x
, b
->decl
))
2015 && duplicate_decls (x
, b
->decl
))
2018 thistype
= (vistype
? composite_type (vistype
, type
) : type
);
2019 b
->type
= TREE_TYPE (b
->decl
);
2020 if (TREE_CODE (b
->decl
) == FUNCTION_DECL
&& DECL_BUILT_IN (b
->decl
))
2022 = build_type_attribute_variant (thistype
,
2023 TYPE_ATTRIBUTES (b
->type
));
2024 TREE_TYPE (b
->decl
) = thistype
;
2025 bind (name
, b
->decl
, scope
, /*invisible=*/false, /*nested=*/true);
2028 else if (TREE_PUBLIC (x
))
2030 if (visdecl
&& !b
&& duplicate_decls (x
, visdecl
))
2032 /* An external declaration at block scope referring to a
2033 visible entity with internal linkage. The composite
2034 type will already be correct for this scope, so we
2035 just need to fall through to make the declaration in
2041 bind (name
, x
, external_scope
, /*invisible=*/true,
2047 /* Similarly, a declaration of a function with static linkage at
2048 block scope must be checked against any existing declaration
2049 of that function at file scope. */
2050 else if (TREE_CODE (x
) == FUNCTION_DECL
&& scope
!= file_scope
2051 && !TREE_PUBLIC (x
) && !DECL_INITIAL (x
))
2053 if (warn_nested_externs
&& !DECL_IN_SYSTEM_HEADER (x
))
2054 warning ("nested static declaration of '%D'", x
);
2056 while (b
&& !B_IN_FILE_SCOPE (b
))
2059 if (b
&& same_translation_unit_p (x
, b
->decl
)
2060 && duplicate_decls (x
, b
->decl
))
2062 bind (name
, b
->decl
, scope
, /*invisible=*/false, /*nested=*/true);
2067 bind (name
, x
, file_scope
, /*invisible=*/true, /*nested=*/false);
2072 warn_if_shadowing (x
);
2074 skip_external_and_shadow_checks
:
2075 if (TREE_CODE (x
) == TYPE_DECL
)
2076 clone_underlying_type (x
);
2078 bind (name
, x
, scope
, /*invisible=*/false, nested
);
2080 /* If x's type is incomplete because it's based on a
2081 structure or union which has not yet been fully declared,
2082 attach it to that structure or union type, so we can go
2083 back and complete the variable declaration later, if the
2084 structure or union gets fully declared.
2086 If the input is erroneous, we can have error_mark in the type
2087 slot (e.g. "f(void a, ...)") - that doesn't count as an
2089 if (TREE_TYPE (x
) != error_mark_node
2090 && !COMPLETE_TYPE_P (TREE_TYPE (x
)))
2092 tree element
= TREE_TYPE (x
);
2094 while (TREE_CODE (element
) == ARRAY_TYPE
)
2095 element
= TREE_TYPE (element
);
2096 element
= TYPE_MAIN_VARIANT (element
);
2098 if ((TREE_CODE (element
) == RECORD_TYPE
2099 || TREE_CODE (element
) == UNION_TYPE
)
2100 && (TREE_CODE (x
) != TYPE_DECL
2101 || TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
)
2102 && !COMPLETE_TYPE_P (element
))
2103 C_TYPE_INCOMPLETE_VARS (element
)
2104 = tree_cons (NULL_TREE
, x
, C_TYPE_INCOMPLETE_VARS (element
));
2109 /* Record X as belonging to file scope.
2110 This is used only internally by the Objective-C front end,
2111 and is limited to its needs. duplicate_decls is not called;
2112 if there is any preexisting decl for this identifier, it is an ICE. */
2115 pushdecl_top_level (tree x
)
2118 bool nested
= false;
2120 gcc_assert (TREE_CODE (x
) == VAR_DECL
);
2122 name
= DECL_NAME (x
);
2124 gcc_assert (!I_SYMBOL_BINDING (name
));
2126 if (TREE_PUBLIC (x
))
2128 bind (name
, x
, external_scope
, /*invisible=*/true, /*nested=*/false);
2132 bind (name
, x
, file_scope
, /*invisible=*/false, nested
);
2138 implicit_decl_warning (tree id
, tree olddecl
)
2140 void (*diag
) (const char *, ...);
2141 switch (mesg_implicit_function_declaration
)
2144 case 1: diag
= warning
; break;
2145 case 2: diag
= error
; break;
2146 default: gcc_unreachable ();
2149 diag (N_("implicit declaration of function '%E'"), id
);
2151 locate_old_decl (olddecl
, diag
);
2154 /* Generate an implicit declaration for identifier FUNCTIONID as a
2155 function of type int (). */
2158 implicitly_declare (tree functionid
)
2160 struct c_binding
*b
;
2162 for (b
= I_SYMBOL_BINDING (functionid
); b
; b
= b
->shadowed
)
2164 if (B_IN_SCOPE (b
, external_scope
))
2173 /* FIXME: Objective-C has weird not-really-builtin functions
2174 which are supposed to be visible automatically. They wind up
2175 in the external scope because they're pushed before the file
2176 scope gets created. Catch this here and rebind them into the
2178 if (!DECL_BUILT_IN (decl
) && DECL_IS_BUILTIN (decl
))
2180 bind (functionid
, decl
, file_scope
,
2181 /*invisible=*/false, /*nested=*/true);
2186 tree newtype
= default_function_type
;
2188 TREE_TYPE (decl
) = b
->type
;
2189 /* Implicit declaration of a function already declared
2190 (somehow) in a different scope, or as a built-in.
2191 If this is the first time this has happened, warn;
2192 then recycle the old declaration but with the new type. */
2193 if (!C_DECL_IMPLICIT (decl
))
2195 implicit_decl_warning (functionid
, decl
);
2196 C_DECL_IMPLICIT (decl
) = 1;
2198 if (DECL_BUILT_IN (decl
))
2200 newtype
= build_type_attribute_variant (newtype
,
2202 (TREE_TYPE (decl
)));
2203 if (!comptypes (newtype
, TREE_TYPE (decl
)))
2205 warning ("incompatible implicit declaration of built-in"
2206 " function %qD", decl
);
2207 newtype
= TREE_TYPE (decl
);
2212 if (!comptypes (newtype
, TREE_TYPE (decl
)))
2214 error ("incompatible implicit declaration of function %qD",
2216 locate_old_decl (decl
, error
);
2219 b
->type
= TREE_TYPE (decl
);
2220 TREE_TYPE (decl
) = newtype
;
2221 bind (functionid
, decl
, current_scope
,
2222 /*invisible=*/false, /*nested=*/true);
2227 /* Not seen before. */
2228 decl
= build_decl (FUNCTION_DECL
, functionid
, default_function_type
);
2229 DECL_EXTERNAL (decl
) = 1;
2230 TREE_PUBLIC (decl
) = 1;
2231 C_DECL_IMPLICIT (decl
) = 1;
2232 implicit_decl_warning (functionid
, 0);
2234 /* C89 says implicit declarations are in the innermost block.
2235 So we record the decl in the standard fashion. */
2236 decl
= pushdecl (decl
);
2238 /* No need to call objc_check_decl here - it's a function type. */
2239 rest_of_decl_compilation (decl
, 0, 0);
2241 /* Write a record describing this implicit function declaration
2242 to the prototypes file (if requested). */
2243 gen_aux_info_record (decl
, 0, 1, 0);
2245 /* Possibly apply some default attributes to this implicit declaration. */
2246 decl_attributes (&decl
, NULL_TREE
, 0);
2251 /* Issue an error message for a reference to an undeclared variable
2252 ID, including a reference to a builtin outside of function-call
2253 context. Establish a binding of the identifier to error_mark_node
2254 in an appropriate scope, which will suppress further errors for the
2257 undeclared_variable (tree id
)
2259 static bool already
= false;
2260 struct c_scope
*scope
;
2262 if (current_function_decl
== 0)
2264 error ("'%E' undeclared here (not in a function)", id
);
2265 scope
= current_scope
;
2269 error ("'%E' undeclared (first use in this function)", id
);
2273 error ("(Each undeclared identifier is reported only once");
2274 error ("for each function it appears in.)");
2278 /* If we are parsing old-style parameter decls, current_function_decl
2279 will be nonnull but current_function_scope will be null. */
2280 scope
= current_function_scope
? current_function_scope
: current_scope
;
2282 bind (id
, error_mark_node
, scope
, /*invisible=*/false, /*nested=*/false);
2285 /* Subroutine of lookup_label, declare_label, define_label: construct a
2286 LABEL_DECL with all the proper frills. */
2289 make_label (tree name
, location_t location
)
2291 tree label
= build_decl (LABEL_DECL
, name
, void_type_node
);
2293 DECL_CONTEXT (label
) = current_function_decl
;
2294 DECL_MODE (label
) = VOIDmode
;
2295 DECL_SOURCE_LOCATION (label
) = location
;
2300 /* Get the LABEL_DECL corresponding to identifier NAME as a label.
2301 Create one if none exists so far for the current function.
2302 This is called when a label is used in a goto expression or
2303 has its address taken. */
2306 lookup_label (tree name
)
2310 if (current_function_decl
== 0)
2312 error ("label %s referenced outside of any function",
2313 IDENTIFIER_POINTER (name
));
2317 /* Use a label already defined or ref'd with this name, but not if
2318 it is inherited from a containing function and wasn't declared
2320 label
= I_LABEL_DECL (name
);
2321 if (label
&& (DECL_CONTEXT (label
) == current_function_decl
2322 || C_DECLARED_LABEL_FLAG (label
)))
2324 /* If the label has only been declared, update its apparent
2325 location to point here, for better diagnostics if it
2326 turns out not to have been defined. */
2327 if (!TREE_USED (label
))
2328 DECL_SOURCE_LOCATION (label
) = input_location
;
2332 /* No label binding for that identifier; make one. */
2333 label
= make_label (name
, input_location
);
2335 /* Ordinary labels go in the current function scope. */
2336 bind (name
, label
, current_function_scope
,
2337 /*invisible=*/false, /*nested=*/false);
2341 /* Make a label named NAME in the current function, shadowing silently
2342 any that may be inherited from containing functions or containing
2343 scopes. This is called for __label__ declarations. */
2346 declare_label (tree name
)
2348 struct c_binding
*b
= I_LABEL_BINDING (name
);
2351 /* Check to make sure that the label hasn't already been declared
2353 if (b
&& B_IN_CURRENT_SCOPE (b
))
2355 error ("duplicate label declaration `%s'", IDENTIFIER_POINTER (name
));
2356 locate_old_decl (b
->decl
, error
);
2358 /* Just use the previous declaration. */
2362 label
= make_label (name
, input_location
);
2363 C_DECLARED_LABEL_FLAG (label
) = 1;
2365 /* Declared labels go in the current scope. */
2366 bind (name
, label
, current_scope
,
2367 /*invisible=*/false, /*nested=*/false);
2371 /* Define a label, specifying the location in the source file.
2372 Return the LABEL_DECL node for the label, if the definition is valid.
2373 Otherwise return 0. */
2376 define_label (location_t location
, tree name
)
2378 /* Find any preexisting label with this name. It is an error
2379 if that label has already been defined in this function, or
2380 if there is a containing function with a declared label with
2382 tree label
= I_LABEL_DECL (name
);
2385 && ((DECL_CONTEXT (label
) == current_function_decl
2386 && DECL_INITIAL (label
) != 0)
2387 || (DECL_CONTEXT (label
) != current_function_decl
2388 && C_DECLARED_LABEL_FLAG (label
))))
2390 error ("%Hduplicate label `%D'", &location
, label
);
2391 locate_old_decl (label
, error
);
2394 else if (label
&& DECL_CONTEXT (label
) == current_function_decl
)
2396 /* The label has been used or declared already in this function,
2397 but not defined. Update its location to point to this
2399 DECL_SOURCE_LOCATION (label
) = location
;
2403 /* No label binding for that identifier; make one. */
2404 label
= make_label (name
, location
);
2406 /* Ordinary labels go in the current function scope. */
2407 bind (name
, label
, current_function_scope
,
2408 /*invisible=*/false, /*nested=*/false);
2411 if (warn_traditional
&& !in_system_header
&& lookup_name (name
))
2412 warning ("%Htraditional C lacks a separate namespace for labels, "
2413 "identifier `%s' conflicts", &location
,
2414 IDENTIFIER_POINTER (name
));
2416 /* Mark label as having been defined. */
2417 DECL_INITIAL (label
) = error_mark_node
;
2421 /* Given NAME, an IDENTIFIER_NODE,
2422 return the structure (or union or enum) definition for that name.
2423 If THISLEVEL_ONLY is nonzero, searches only the current_scope.
2424 CODE says which kind of type the caller wants;
2425 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2426 If the wrong kind of type is found, an error is reported. */
2429 lookup_tag (enum tree_code code
, tree name
, int thislevel_only
)
2431 struct c_binding
*b
= I_TAG_BINDING (name
);
2437 /* We only care about whether it's in this level if
2438 thislevel_only was set or it might be a type clash. */
2439 if (thislevel_only
|| TREE_CODE (b
->decl
) != code
)
2441 /* For our purposes, a tag in the external scope is the same as
2442 a tag in the file scope. (Primarily relevant to Objective-C
2443 and its builtin structure tags, which get pushed before the
2444 file scope is created.) */
2445 if (B_IN_CURRENT_SCOPE (b
)
2446 || (current_scope
== file_scope
&& B_IN_EXTERNAL_SCOPE (b
)))
2450 if (thislevel_only
&& !thislevel
)
2453 if (TREE_CODE (b
->decl
) != code
)
2455 /* Definition isn't the kind we were looking for. */
2456 pending_invalid_xref
= name
;
2457 pending_invalid_xref_location
= input_location
;
2459 /* If in the same binding level as a declaration as a tag
2460 of a different type, this must not be allowed to
2461 shadow that tag, so give the error immediately.
2462 (For example, "struct foo; union foo;" is invalid.) */
2464 pending_xref_error ();
2469 /* Print an error message now
2470 for a recent invalid struct, union or enum cross reference.
2471 We don't print them immediately because they are not invalid
2472 when used in the `struct foo;' construct for shadowing. */
2475 pending_xref_error (void)
2477 if (pending_invalid_xref
!= 0)
2478 error ("%H`%s' defined as wrong kind of tag",
2479 &pending_invalid_xref_location
,
2480 IDENTIFIER_POINTER (pending_invalid_xref
));
2481 pending_invalid_xref
= 0;
2485 /* Look up NAME in the current scope and its superiors
2486 in the namespace of variables, functions and typedefs.
2487 Return a ..._DECL node of some kind representing its definition,
2488 or return 0 if it is undefined. */
2491 lookup_name (tree name
)
2493 struct c_binding
*b
= I_SYMBOL_BINDING (name
);
2494 if (b
&& !b
->invisible
)
2499 /* Similar to `lookup_name' but look only at the indicated scope. */
2502 lookup_name_in_scope (tree name
, struct c_scope
*scope
)
2504 struct c_binding
*b
;
2506 for (b
= I_SYMBOL_BINDING (name
); b
; b
= b
->shadowed
)
2507 if (B_IN_SCOPE (b
, scope
))
2512 /* Create the predefined scalar types of C,
2513 and some nodes representing standard constants (0, 1, (void *) 0).
2514 Initialize the global scope.
2515 Make definitions for built-in primitive functions. */
2518 c_init_decl_processing (void)
2521 tree ptr_ftype_void
, ptr_ftype_ptr
;
2522 location_t save_loc
= input_location
;
2524 /* Adds some ggc roots, and reserved words for c-parse.in. */
2527 current_function_decl
= 0;
2529 /* Make the externals scope. */
2531 external_scope
= current_scope
;
2533 /* Declarations from c_common_nodes_and_builtins must not be associated
2534 with this input file, lest we get differences between using and not
2535 using preprocessed headers. */
2536 #ifdef USE_MAPPED_LOCATION
2537 input_location
= BUILTINS_LOCATION
;
2539 input_location
.file
= "<built-in>";
2540 input_location
.line
= 0;
2543 build_common_tree_nodes (flag_signed_char
, false);
2545 c_common_nodes_and_builtins ();
2547 /* In C, comparisons and TRUTH_* expressions have type int. */
2548 truthvalue_type_node
= integer_type_node
;
2549 truthvalue_true_node
= integer_one_node
;
2550 truthvalue_false_node
= integer_zero_node
;
2552 /* Even in C99, which has a real boolean type. */
2553 pushdecl (build_decl (TYPE_DECL
, get_identifier ("_Bool"),
2554 boolean_type_node
));
2556 endlink
= void_list_node
;
2557 ptr_ftype_void
= build_function_type (ptr_type_node
, endlink
);
2559 = build_function_type (ptr_type_node
,
2560 tree_cons (NULL_TREE
, ptr_type_node
, endlink
));
2562 input_location
= save_loc
;
2564 pedantic_lvalues
= true;
2566 make_fname_decl
= c_make_fname_decl
;
2567 start_fname_decls ();
2570 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
2571 decl, NAME is the initialization string and TYPE_DEP indicates whether
2572 NAME depended on the type of the function. As we don't yet implement
2573 delayed emission of static data, we mark the decl as emitted
2574 so it is not placed in the output. Anything using it must therefore pull
2575 out the STRING_CST initializer directly. FIXME. */
2578 c_make_fname_decl (tree id
, int type_dep
)
2580 const char *name
= fname_as_string (type_dep
);
2581 tree decl
, type
, init
;
2582 size_t length
= strlen (name
);
2584 type
= build_array_type
2585 (build_qualified_type (char_type_node
, TYPE_QUAL_CONST
),
2586 build_index_type (size_int (length
)));
2588 decl
= build_decl (VAR_DECL
, id
, type
);
2590 TREE_STATIC (decl
) = 1;
2591 TREE_READONLY (decl
) = 1;
2592 DECL_ARTIFICIAL (decl
) = 1;
2594 init
= build_string (length
+ 1, name
);
2595 free ((char *) name
);
2596 TREE_TYPE (init
) = type
;
2597 DECL_INITIAL (decl
) = init
;
2599 TREE_USED (decl
) = 1;
2601 if (current_function_decl
)
2603 DECL_CONTEXT (decl
) = current_function_decl
;
2604 bind (id
, decl
, current_function_scope
,
2605 /*invisible=*/false, /*nested=*/false);
2608 finish_decl (decl
, init
, NULL_TREE
);
2613 /* Return a definition for a builtin function named NAME and whose data type
2614 is TYPE. TYPE should be a function type with argument types.
2615 FUNCTION_CODE tells later passes how to compile calls to this function.
2616 See tree.h for its possible values.
2618 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
2619 the name to be called if we can't opencode the function. If
2620 ATTRS is nonzero, use that for the function's attribute list. */
2623 builtin_function (const char *name
, tree type
, int function_code
,
2624 enum built_in_class cl
, const char *library_name
,
2627 tree id
= get_identifier (name
);
2628 tree decl
= build_decl (FUNCTION_DECL
, id
, type
);
2629 TREE_PUBLIC (decl
) = 1;
2630 DECL_EXTERNAL (decl
) = 1;
2631 DECL_LANG_SPECIFIC (decl
) = GGC_CNEW (struct lang_decl
);
2632 DECL_BUILT_IN_CLASS (decl
) = cl
;
2633 DECL_FUNCTION_CODE (decl
) = function_code
;
2635 SET_DECL_ASSEMBLER_NAME (decl
, get_identifier (library_name
));
2637 /* Should never be called on a symbol with a preexisting meaning. */
2638 gcc_assert (!I_SYMBOL_BINDING (id
));
2640 bind (id
, decl
, external_scope
, /*invisible=*/true, /*nested=*/false);
2642 /* Builtins in the implementation namespace are made visible without
2643 needing to be explicitly declared. See push_file_scope. */
2644 if (name
[0] == '_' && (name
[1] == '_' || ISUPPER (name
[1])))
2646 TREE_CHAIN (decl
) = visible_builtins
;
2647 visible_builtins
= decl
;
2650 /* Possibly apply some default attributes to this built-in function. */
2652 decl_attributes (&decl
, attrs
, ATTR_FLAG_BUILT_IN
);
2654 decl_attributes (&decl
, NULL_TREE
, 0);
2659 /* Called when a declaration is seen that contains no names to declare.
2660 If its type is a reference to a structure, union or enum inherited
2661 from a containing scope, shadow that tag name for the current scope
2662 with a forward reference.
2663 If its type defines a new named structure or union
2664 or defines an enum, it is valid but we need not do anything here.
2665 Otherwise, it is an error. */
2668 shadow_tag (tree declspecs
)
2670 shadow_tag_warned (declspecs
, 0);
2673 /* WARNED is 1 if we have done a pedwarn, 2 if we have done a warning,
2676 shadow_tag_warned (tree declspecs
, int warned
)
2682 pending_invalid_xref
= 0;
2684 /* Remove the attributes from declspecs, since they will confuse the
2686 split_specs_attrs (declspecs
, &specs
, &attrs
);
2688 for (link
= specs
; link
; link
= TREE_CHAIN (link
))
2690 tree value
= TREE_VALUE (link
);
2691 enum tree_code code
= TREE_CODE (value
);
2693 if (code
== RECORD_TYPE
|| code
== UNION_TYPE
|| code
== ENUMERAL_TYPE
)
2694 /* Used to test also that TYPE_SIZE (value) != 0.
2695 That caused warning for `struct foo;' at top level in the file. */
2697 tree name
= TYPE_NAME (value
);
2704 if (warned
!= 1 && code
!= ENUMERAL_TYPE
)
2705 /* Empty unnamed enum OK */
2707 pedwarn ("unnamed struct/union that defines no instances");
2713 t
= lookup_tag (code
, name
, 1);
2717 t
= make_node (code
);
2724 if (!warned
&& ! in_system_header
)
2726 warning ("useless keyword or type name in empty declaration");
2733 error ("two types specified in one empty declaration");
2738 pedwarn ("empty declaration");
2742 /* Construct an array declarator. EXPR is the expression inside [], or
2743 NULL_TREE. QUALS are the type qualifiers inside the [] (to be applied
2744 to the pointer to which a parameter array is converted). STATIC_P is
2745 true if "static" is inside the [], false otherwise. VLA_UNSPEC_P
2746 is true if the array is [*], a VLA of unspecified length which is
2747 nevertheless a complete type (not currently implemented by GCC),
2748 false otherwise. The declarator is constructed as an ARRAY_REF
2749 (to be decoded by grokdeclarator), whose operand 0 is what's on the
2750 left of the [] (filled by in set_array_declarator_inner) and operand 1
2751 is the expression inside; whose TREE_TYPE is the type qualifiers and
2752 which has TREE_STATIC set if "static" is used. */
2755 build_array_declarator (tree expr
, tree quals
, bool static_p
,
2759 decl
= build_nt (ARRAY_REF
, NULL_TREE
, expr
, NULL_TREE
, NULL_TREE
);
2760 TREE_TYPE (decl
) = quals
;
2761 TREE_STATIC (decl
) = (static_p
? 1 : 0);
2762 if (pedantic
&& !flag_isoc99
)
2764 if (static_p
|| quals
!= NULL_TREE
)
2765 pedwarn ("ISO C90 does not support `static' or type qualifiers in parameter array declarators");
2767 pedwarn ("ISO C90 does not support `[*]' array declarators");
2770 warning ("GCC does not yet properly implement `[*]' array declarators");
2774 /* Set the type of an array declarator. DECL is the declarator, as
2775 constructed by build_array_declarator; TYPE is what appears on the left
2776 of the [] and goes in operand 0. ABSTRACT_P is true if it is an
2777 abstract declarator, false otherwise; this is used to reject static and
2778 type qualifiers in abstract declarators, where they are not in the
2782 set_array_declarator_inner (tree decl
, tree type
, bool abstract_p
)
2784 TREE_OPERAND (decl
, 0) = type
;
2785 if (abstract_p
&& (TREE_TYPE (decl
) != NULL_TREE
|| TREE_STATIC (decl
)))
2786 error ("static or type qualifiers in abstract declarator");
2790 /* Split SPECS_ATTRS, a list of declspecs and prefix attributes, into two
2791 lists. SPECS_ATTRS may also be just a typespec (eg: RECORD_TYPE).
2793 The head of the declspec list is stored in DECLSPECS.
2794 The head of the attribute list is stored in PREFIX_ATTRIBUTES.
2796 Note that attributes in SPECS_ATTRS are stored in the TREE_PURPOSE of
2797 the list elements. We drop the containing TREE_LIST nodes and link the
2798 resulting attributes together the way decl_attributes expects them. */
2801 split_specs_attrs (tree specs_attrs
, tree
*declspecs
, tree
*prefix_attributes
)
2803 tree t
, s
, a
, next
, specs
, attrs
;
2805 /* This can happen after an __extension__ in pedantic mode. */
2806 if (specs_attrs
!= NULL_TREE
2807 && TREE_CODE (specs_attrs
) == INTEGER_CST
)
2809 *declspecs
= NULL_TREE
;
2810 *prefix_attributes
= NULL_TREE
;
2814 /* This can happen in c++ (eg: decl: typespec initdecls ';'). */
2815 if (specs_attrs
!= NULL_TREE
2816 && TREE_CODE (specs_attrs
) != TREE_LIST
)
2818 *declspecs
= specs_attrs
;
2819 *prefix_attributes
= NULL_TREE
;
2823 /* Remember to keep the lists in the same order, element-wise. */
2825 specs
= s
= NULL_TREE
;
2826 attrs
= a
= NULL_TREE
;
2827 for (t
= specs_attrs
; t
; t
= next
)
2829 next
= TREE_CHAIN (t
);
2830 /* Declspecs have a non-NULL TREE_VALUE. */
2831 if (TREE_VALUE (t
) != NULL_TREE
)
2833 if (specs
== NULL_TREE
)
2841 /* The TREE_PURPOSE may also be empty in the case of
2842 __attribute__(()). */
2843 else if (TREE_PURPOSE (t
) != NULL_TREE
)
2845 if (attrs
== NULL_TREE
)
2846 attrs
= a
= TREE_PURPOSE (t
);
2849 TREE_CHAIN (a
) = TREE_PURPOSE (t
);
2850 a
= TREE_PURPOSE (t
);
2852 /* More attrs can be linked here, move A to the end. */
2853 while (TREE_CHAIN (a
) != NULL_TREE
)
2858 /* Terminate the lists. */
2860 TREE_CHAIN (s
) = NULL_TREE
;
2862 TREE_CHAIN (a
) = NULL_TREE
;
2866 *prefix_attributes
= attrs
;
2869 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
2872 groktypename (tree type_name
)
2876 if (TREE_CODE (type_name
) != TREE_LIST
)
2879 split_specs_attrs (TREE_PURPOSE (type_name
), &specs
, &attrs
);
2881 type_name
= grokdeclarator (TREE_VALUE (type_name
), specs
, TYPENAME
, false,
2884 /* Apply attributes. */
2885 decl_attributes (&type_name
, attrs
, 0);
2890 /* Return a PARM_DECL node for a given pair of specs and declarator. */
2893 groktypename_in_parm_context (tree type_name
)
2895 if (TREE_CODE (type_name
) != TREE_LIST
)
2897 return grokdeclarator (TREE_VALUE (type_name
),
2898 TREE_PURPOSE (type_name
),
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 (tree declarator
, tree declspecs
, bool initialized
, tree attributes
)
2923 /* An object declared as __attribute__((deprecated)) suppresses
2924 warnings of uses of other deprecated items. */
2925 if (lookup_attribute ("deprecated", attributes
))
2926 deprecated_state
= DEPRECATED_SUPPRESS
;
2928 decl
= grokdeclarator (declarator
, declspecs
,
2929 NORMAL
, initialized
, NULL
);
2931 deprecated_state
= DEPRECATED_NORMAL
;
2933 if (warn_main
> 0 && TREE_CODE (decl
) != FUNCTION_DECL
2934 && MAIN_NAME_P (DECL_NAME (decl
)))
2935 warning ("%J'%D' is usually a function", decl
, decl
);
2938 /* Is it valid for this decl to have an initializer at all?
2939 If not, set INITIALIZED to zero, which will indirectly
2940 tell 'finish_decl' to ignore the initializer once it is parsed. */
2941 switch (TREE_CODE (decl
))
2944 error ("typedef '%D' is initialized (use __typeof__ instead)", decl
);
2949 error ("function '%D' is initialized like a variable", decl
);
2954 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
2955 error ("parameter '%D' is initialized", decl
);
2960 /* Don't allow initializations for incomplete types except for
2961 arrays which might be completed by the initialization. */
2963 /* This can happen if the array size is an undefined macro.
2964 We already gave a warning, so we don't need another one. */
2965 if (TREE_TYPE (decl
) == error_mark_node
)
2967 else if (COMPLETE_TYPE_P (TREE_TYPE (decl
)))
2969 /* A complete type is ok if size is fixed. */
2971 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl
))) != INTEGER_CST
2972 || C_DECL_VARIABLE_SIZE (decl
))
2974 error ("variable-sized object may not be initialized");
2978 else if (TREE_CODE (TREE_TYPE (decl
)) != ARRAY_TYPE
)
2980 error ("variable '%D' has initializer but incomplete type", decl
);
2983 else if (!COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (decl
))))
2985 error ("elements of array '%D' have incomplete type", decl
);
2992 if (current_scope
== file_scope
)
2993 TREE_STATIC (decl
) = 1;
2995 /* Tell 'pushdecl' this is an initialized decl
2996 even though we don't yet have the initializer expression.
2997 Also tell 'finish_decl' it may store the real initializer. */
2998 DECL_INITIAL (decl
) = error_mark_node
;
3001 /* If this is a function declaration, write a record describing it to the
3002 prototypes file (if requested). */
3004 if (TREE_CODE (decl
) == FUNCTION_DECL
)
3005 gen_aux_info_record (decl
, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl
)) != 0);
3007 /* ANSI specifies that a tentative definition which is not merged with
3008 a non-tentative definition behaves exactly like a definition with an
3009 initializer equal to zero. (Section 3.7.2)
3011 -fno-common gives strict ANSI behavior, though this tends to break
3012 a large body of code that grew up without this rule.
3014 Thread-local variables are never common, since there's no entrenched
3015 body of code to break, and it allows more efficient variable references
3016 in the presence of dynamic linking. */
3018 if (TREE_CODE (decl
) == VAR_DECL
3020 && TREE_PUBLIC (decl
)
3021 && !DECL_THREAD_LOCAL (decl
)
3023 DECL_COMMON (decl
) = 1;
3025 /* Set attributes here so if duplicate decl, will have proper attributes. */
3026 decl_attributes (&decl
, attributes
, 0);
3028 if (TREE_CODE (decl
) == FUNCTION_DECL
3029 && targetm
.calls
.promote_prototypes (TREE_TYPE (decl
)))
3031 tree ce
= declarator
;
3033 if (TREE_CODE (ce
) == INDIRECT_REF
)
3034 ce
= TREE_OPERAND (declarator
, 0);
3035 if (TREE_CODE (ce
) == CALL_EXPR
)
3037 tree args
= TREE_PURPOSE (TREE_OPERAND (ce
, 1));
3038 for (; args
; args
= TREE_CHAIN (args
))
3040 tree type
= TREE_TYPE (args
);
3041 if (type
&& INTEGRAL_TYPE_P (type
)
3042 && TYPE_PRECISION (type
) < TYPE_PRECISION (integer_type_node
))
3043 DECL_ARG_TYPE (args
) = integer_type_node
;
3048 if (TREE_CODE (decl
) == FUNCTION_DECL
3049 && DECL_DECLARED_INLINE_P (decl
)
3050 && DECL_UNINLINABLE (decl
)
3051 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl
)))
3052 warning ("%Jinline function '%D' given attribute noinline", decl
, decl
);
3054 /* Add this decl to the current scope.
3055 TEM may equal DECL or it may be a previous decl of the same name. */
3056 tem
= pushdecl (decl
);
3059 DECL_EXTERNAL (tem
) = 0;
3064 /* Finish processing of a declaration;
3065 install its initial value.
3066 If the length of an array type is not known before,
3067 it must be determined now, from the initial value, or it is an error. */
3070 finish_decl (tree decl
, tree init
, tree asmspec_tree
)
3072 tree type
= TREE_TYPE (decl
);
3073 int was_incomplete
= (DECL_SIZE (decl
) == 0);
3074 const char *asmspec
= 0;
3076 /* If a name was specified, get the string. */
3077 if (current_scope
== file_scope
)
3078 asmspec_tree
= maybe_apply_renaming_pragma (decl
, asmspec_tree
);
3080 asmspec
= TREE_STRING_POINTER (asmspec_tree
);
3082 /* If `start_decl' didn't like having an initialization, ignore it now. */
3083 if (init
!= 0 && DECL_INITIAL (decl
) == 0)
3086 /* Don't crash if parm is initialized. */
3087 if (TREE_CODE (decl
) == PARM_DECL
)
3091 store_init_value (decl
, init
);
3093 if (c_dialect_objc () && (TREE_CODE (decl
) == VAR_DECL
3094 || TREE_CODE (decl
) == FUNCTION_DECL
3095 || TREE_CODE (decl
) == FIELD_DECL
))
3096 objc_check_decl (decl
);
3098 /* Deduce size of array from initialization, if not already known. */
3099 if (TREE_CODE (type
) == ARRAY_TYPE
3100 && TYPE_DOMAIN (type
) == 0
3101 && TREE_CODE (decl
) != TYPE_DECL
)
3104 = (TREE_STATIC (decl
)
3105 /* Even if pedantic, an external linkage array
3106 may have incomplete type at first. */
3107 ? pedantic
&& !TREE_PUBLIC (decl
)
3108 : !DECL_EXTERNAL (decl
));
3110 = complete_array_type (type
, DECL_INITIAL (decl
), do_default
);
3112 /* Get the completed type made by complete_array_type. */
3113 type
= TREE_TYPE (decl
);
3116 error ("%Jinitializer fails to determine size of '%D'", decl
, decl
);
3118 else if (failure
== 2)
3121 error ("%Jarray size missing in '%D'", decl
, decl
);
3122 /* If a `static' var's size isn't known,
3123 make it extern as well as static, so it does not get
3125 If it is not `static', then do not mark extern;
3126 finish_incomplete_decl will give it a default size
3127 and it will get allocated. */
3128 else if (!pedantic
&& TREE_STATIC (decl
) && ! TREE_PUBLIC (decl
))
3129 DECL_EXTERNAL (decl
) = 1;
3132 /* TYPE_MAX_VALUE is always one less than the number of elements
3133 in the array, because we start counting at zero. Therefore,
3134 warn only if the value is less than zero. */
3135 else if (pedantic
&& TYPE_DOMAIN (type
) != 0
3136 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type
))) < 0)
3137 error ("%Jzero or negative size array '%D'", decl
, decl
);
3139 layout_decl (decl
, 0);
3142 if (TREE_CODE (decl
) == VAR_DECL
)
3144 if (DECL_SIZE (decl
) == 0 && TREE_TYPE (decl
) != error_mark_node
3145 && COMPLETE_TYPE_P (TREE_TYPE (decl
)))
3146 layout_decl (decl
, 0);
3148 if (DECL_SIZE (decl
) == 0
3149 /* Don't give an error if we already gave one earlier. */
3150 && TREE_TYPE (decl
) != error_mark_node
3151 && (TREE_STATIC (decl
)
3152 /* A static variable with an incomplete type
3153 is an error if it is initialized.
3154 Also if it is not file scope.
3155 Otherwise, let it through, but if it is not `extern'
3156 then it may cause an error message later. */
3157 ? (DECL_INITIAL (decl
) != 0
3158 || !DECL_FILE_SCOPE_P (decl
))
3159 /* An automatic variable with an incomplete type
3161 : !DECL_EXTERNAL (decl
)))
3163 error ("%Jstorage size of '%D' isn't known", decl
, decl
);
3164 TREE_TYPE (decl
) = error_mark_node
;
3167 if ((DECL_EXTERNAL (decl
) || TREE_STATIC (decl
))
3168 && DECL_SIZE (decl
) != 0)
3170 if (TREE_CODE (DECL_SIZE (decl
)) == INTEGER_CST
)
3171 constant_expression_warning (DECL_SIZE (decl
));
3173 error ("%Jstorage size of '%D' isn't constant", decl
, decl
);
3176 if (TREE_USED (type
))
3177 TREE_USED (decl
) = 1;
3180 /* If this is a function and an assembler name is specified, reset DECL_RTL
3181 so we can give it its new name. Also, update built_in_decls if it
3182 was a normal built-in. */
3183 if (TREE_CODE (decl
) == FUNCTION_DECL
&& asmspec
)
3185 if (DECL_BUILT_IN_CLASS (decl
) == BUILT_IN_NORMAL
)
3187 tree builtin
= built_in_decls
[DECL_FUNCTION_CODE (decl
)];
3188 set_user_assembler_name (builtin
, asmspec
);
3189 if (DECL_FUNCTION_CODE (decl
) == BUILT_IN_MEMCPY
)
3190 init_block_move_fn (asmspec
);
3191 else if (DECL_FUNCTION_CODE (decl
) == BUILT_IN_MEMSET
)
3192 init_block_clear_fn (asmspec
);
3194 set_user_assembler_name (decl
, asmspec
);
3197 /* If #pragma weak was used, mark the decl weak now. */
3198 if (current_scope
== file_scope
)
3199 maybe_apply_pragma_weak (decl
);
3201 /* If this is a variable definition, determine its ELF visibility. */
3202 if (TREE_CODE (decl
) == VAR_DECL
3203 && TREE_STATIC (decl
)
3204 && !DECL_EXTERNAL (decl
))
3205 c_determine_visibility (decl
);
3207 /* Output the assembler code and/or RTL code for variables and functions,
3208 unless the type is an undefined structure or union.
3209 If not, it will get done when the type is completed. */
3211 if (TREE_CODE (decl
) == VAR_DECL
|| TREE_CODE (decl
) == FUNCTION_DECL
)
3213 /* This is a no-op in c-lang.c or something real in objc-act.c. */
3214 if (c_dialect_objc ())
3215 objc_check_decl (decl
);
3219 /* If this is not a static variable, issue a warning.
3220 It doesn't make any sense to give an ASMSPEC for an
3221 ordinary, non-register local variable. Historically,
3222 GCC has accepted -- but ignored -- the ASMSPEC in
3224 if (! DECL_FILE_SCOPE_P (decl
)
3225 && TREE_CODE (decl
) == VAR_DECL
3226 && !C_DECL_REGISTER (decl
)
3227 && !TREE_STATIC (decl
))
3228 warning ("%Jignoring asm-specifier for non-static local "
3229 "variable '%D'", decl
, decl
);
3230 else if (C_DECL_REGISTER (decl
))
3231 change_decl_assembler_name (decl
, get_identifier (asmspec
));
3233 set_user_assembler_name (decl
, asmspec
);
3236 if (DECL_FILE_SCOPE_P (decl
))
3238 if (DECL_INITIAL (decl
) == NULL_TREE
3239 || DECL_INITIAL (decl
) == error_mark_node
)
3240 /* Don't output anything
3241 when a tentative file-scope definition is seen.
3242 But at end of compilation, do output code for them. */
3243 DECL_DEFER_OUTPUT (decl
) = 1;
3244 rest_of_decl_compilation (decl
, true, 0);
3248 /* In conjunction with an ASMSPEC, the `register'
3249 keyword indicates that we should place the variable
3250 in a particular register. */
3251 if (asmspec
&& C_DECL_REGISTER (decl
))
3253 DECL_HARD_REGISTER (decl
) = 1;
3254 /* This cannot be done for a structure with volatile
3255 fields, on which DECL_REGISTER will have been
3257 if (!DECL_REGISTER (decl
))
3258 error ("cannot put object with volatile field into register");
3261 if (TREE_CODE (decl
) != FUNCTION_DECL
)
3263 /* If we're building a variable sized type, and we might be
3264 reachable other than via the top of the current binding
3265 level, then create a new BIND_EXPR so that we deallocate
3266 the object at the right time. */
3267 /* Note that DECL_SIZE can be null due to errors. */
3268 if (DECL_SIZE (decl
)
3269 && !TREE_CONSTANT (DECL_SIZE (decl
))
3270 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list
))
3273 bind
= build3 (BIND_EXPR
, void_type_node
, NULL
, NULL
, NULL
);
3274 TREE_SIDE_EFFECTS (bind
) = 1;
3276 BIND_EXPR_BODY (bind
) = push_stmt_list ();
3278 add_stmt (build_stmt (DECL_EXPR
, decl
));
3283 if (!DECL_FILE_SCOPE_P (decl
))
3285 /* Recompute the RTL of a local array now
3286 if it used to be an incomplete type. */
3288 && ! TREE_STATIC (decl
) && ! DECL_EXTERNAL (decl
))
3290 /* If we used it already as memory, it must stay in memory. */
3291 TREE_ADDRESSABLE (decl
) = TREE_USED (decl
);
3292 /* If it's still incomplete now, no init will save it. */
3293 if (DECL_SIZE (decl
) == 0)
3294 DECL_INITIAL (decl
) = 0;
3299 /* If this was marked 'used', be sure it will be output. */
3300 if (lookup_attribute ("used", DECL_ATTRIBUTES (decl
)))
3301 mark_decl_referenced (decl
);
3303 if (TREE_CODE (decl
) == TYPE_DECL
)
3305 if (!DECL_FILE_SCOPE_P (decl
)
3306 && variably_modified_type_p (TREE_TYPE (decl
), NULL_TREE
))
3307 add_stmt (build_stmt (DECL_EXPR
, decl
));
3309 rest_of_decl_compilation (decl
, DECL_FILE_SCOPE_P (decl
), 0);
3312 /* At the end of a declaration, throw away any variable type sizes
3313 of types defined inside that declaration. There is no use
3314 computing them in the following function definition. */
3315 if (current_scope
== file_scope
)
3316 get_pending_sizes ();
3318 /* Install a cleanup (aka destructor) if one was given. */
3319 if (TREE_CODE (decl
) == VAR_DECL
&& !TREE_STATIC (decl
))
3321 tree attr
= lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl
));
3324 tree cleanup_id
= TREE_VALUE (TREE_VALUE (attr
));
3325 tree cleanup_decl
= lookup_name (cleanup_id
);
3328 /* Build "cleanup(&decl)" for the destructor. */
3329 cleanup
= build_unary_op (ADDR_EXPR
, decl
, 0);
3330 cleanup
= build_tree_list (NULL_TREE
, cleanup
);
3331 cleanup
= build_function_call (cleanup_decl
, cleanup
);
3333 /* Don't warn about decl unused; the cleanup uses it. */
3334 TREE_USED (decl
) = 1;
3335 TREE_USED (cleanup_decl
) = 1;
3337 /* Initialize EH, if we've been told to do so. */
3338 if (flag_exceptions
&& !c_eh_initialized_p
)
3340 c_eh_initialized_p
= true;
3341 eh_personality_libfunc
3342 = init_one_libfunc (USING_SJLJ_EXCEPTIONS
3343 ? "__gcc_personality_sj0"
3344 : "__gcc_personality_v0");
3345 using_eh_for_cleanups ();
3348 push_cleanup (decl
, cleanup
, false);
3353 /* Given a parsed parameter declaration, decode it into a PARM_DECL. */
3356 grokparm (tree parm
)
3358 tree decl
= grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm
)),
3359 TREE_PURPOSE (TREE_PURPOSE (parm
)),
3362 decl_attributes (&decl
, TREE_VALUE (parm
), 0);
3367 /* Given a parsed parameter declaration, decode it into a PARM_DECL
3368 and push that on the current scope. */
3371 push_parm_decl (tree parm
)
3375 decl
= grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm
)),
3376 TREE_PURPOSE (TREE_PURPOSE (parm
)),
3378 decl_attributes (&decl
, TREE_VALUE (parm
), 0);
3380 decl
= pushdecl (decl
);
3382 finish_decl (decl
, NULL_TREE
, NULL_TREE
);
3385 /* Mark all the parameter declarations to date as forward decls.
3386 Also diagnose use of this extension. */
3389 mark_forward_parm_decls (void)
3391 struct c_binding
*b
;
3393 if (pedantic
&& !current_scope
->warned_forward_parm_decls
)
3395 pedwarn ("ISO C forbids forward parameter declarations");
3396 current_scope
->warned_forward_parm_decls
= true;
3399 for (b
= current_scope
->bindings
; b
; b
= b
->prev
)
3400 if (TREE_CODE (b
->decl
) == PARM_DECL
)
3401 TREE_ASM_WRITTEN (b
->decl
) = 1;
3404 static GTY(()) int compound_literal_number
;
3406 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
3407 literal, which may be an incomplete array type completed by the
3408 initializer; INIT is a CONSTRUCTOR that initializes the compound
3412 build_compound_literal (tree type
, tree init
)
3414 /* We do not use start_decl here because we have a type, not a declarator;
3415 and do not use finish_decl because the decl should be stored inside
3416 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_EXPR. */
3417 tree decl
= build_decl (VAR_DECL
, NULL_TREE
, type
);
3420 DECL_EXTERNAL (decl
) = 0;
3421 TREE_PUBLIC (decl
) = 0;
3422 TREE_STATIC (decl
) = (current_scope
== file_scope
);
3423 DECL_CONTEXT (decl
) = current_function_decl
;
3424 TREE_USED (decl
) = 1;
3425 TREE_TYPE (decl
) = type
;
3426 TREE_READONLY (decl
) = TYPE_READONLY (type
);
3427 store_init_value (decl
, init
);
3429 if (TREE_CODE (type
) == ARRAY_TYPE
&& !COMPLETE_TYPE_P (type
))
3431 int failure
= complete_array_type (type
, DECL_INITIAL (decl
), 1);
3433 gcc_assert (!failure
);
3436 type
= TREE_TYPE (decl
);
3437 if (type
== error_mark_node
|| !COMPLETE_TYPE_P (type
))
3438 return error_mark_node
;
3440 stmt
= build_stmt (DECL_EXPR
, decl
);
3441 complit
= build1 (COMPOUND_LITERAL_EXPR
, TREE_TYPE (decl
), stmt
);
3442 TREE_SIDE_EFFECTS (complit
) = 1;
3444 layout_decl (decl
, 0);
3446 if (TREE_STATIC (decl
))
3448 /* This decl needs a name for the assembler output. We also need
3449 a unique suffix to be added to the name. */
3452 ASM_FORMAT_PRIVATE_NAME (name
, "__compound_literal",
3453 compound_literal_number
);
3454 compound_literal_number
++;
3455 DECL_NAME (decl
) = get_identifier (name
);
3456 DECL_DEFER_OUTPUT (decl
) = 1;
3457 DECL_COMDAT (decl
) = 1;
3458 DECL_ARTIFICIAL (decl
) = 1;
3460 rest_of_decl_compilation (decl
, 1, 0);
3466 /* Make TYPE a complete type based on INITIAL_VALUE.
3467 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3468 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3471 complete_array_type (tree type
, tree initial_value
, int do_default
)
3473 tree maxindex
= NULL_TREE
;
3478 /* Note MAXINDEX is really the maximum index,
3479 one less than the size. */
3480 if (TREE_CODE (initial_value
) == STRING_CST
)
3483 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value
)));
3484 maxindex
= build_int_cst (NULL_TREE
,
3485 (TREE_STRING_LENGTH (initial_value
)
3488 else if (TREE_CODE (initial_value
) == CONSTRUCTOR
)
3490 tree elts
= CONSTRUCTOR_ELTS (initial_value
);
3491 maxindex
= build_int_cst (NULL_TREE
, -1);
3492 for (; elts
; elts
= TREE_CHAIN (elts
))
3494 if (TREE_PURPOSE (elts
))
3495 maxindex
= TREE_PURPOSE (elts
);
3497 maxindex
= fold (build2 (PLUS_EXPR
, integer_type_node
,
3498 maxindex
, integer_one_node
));
3503 /* Make an error message unless that happened already. */
3504 if (initial_value
!= error_mark_node
)
3507 /* Prevent further error messages. */
3508 maxindex
= build_int_cst (NULL_TREE
, 0);
3515 maxindex
= build_int_cst (NULL_TREE
, 0);
3521 TYPE_DOMAIN (type
) = build_index_type (maxindex
);
3523 gcc_assert (TREE_TYPE (maxindex
));
3526 /* Lay out the type now that we can get the real answer. */
3533 /* Determine whether TYPE is a structure with a flexible array member,
3534 or a union containing such a structure (possibly recursively). */
3537 flexible_array_type_p (tree type
)
3540 switch (TREE_CODE (type
))
3543 x
= TYPE_FIELDS (type
);
3546 while (TREE_CHAIN (x
) != NULL_TREE
)
3548 if (TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
3549 && TYPE_SIZE (TREE_TYPE (x
)) == NULL_TREE
3550 && TYPE_DOMAIN (TREE_TYPE (x
)) != NULL_TREE
3551 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x
))) == NULL_TREE
)
3555 for (x
= TYPE_FIELDS (type
); x
!= NULL_TREE
; x
= TREE_CHAIN (x
))
3557 if (flexible_array_type_p (TREE_TYPE (x
)))
3566 /* Performs sanity checks on the TYPE and WIDTH of the bit-field NAME,
3567 replacing with appropriate values if they are invalid. */
3569 check_bitfield_type_and_width (tree
*type
, tree
*width
, const char *orig_name
)
3572 unsigned int max_width
;
3573 unsigned HOST_WIDE_INT w
;
3574 const char *name
= orig_name
? orig_name
: _("<anonymous>");
3577 STRIP_NOPS (*width
);
3579 /* Detect and ignore out of range field width and process valid
3581 if (TREE_CODE (*width
) != INTEGER_CST
)
3583 error ("bit-field `%s' width not an integer constant", name
);
3584 *width
= integer_one_node
;
3588 constant_expression_warning (*width
);
3589 if (tree_int_cst_sgn (*width
) < 0)
3591 error ("negative width in bit-field `%s'", name
);
3592 *width
= integer_one_node
;
3594 else if (integer_zerop (*width
) && orig_name
)
3596 error ("zero width for bit-field `%s'", name
);
3597 *width
= integer_one_node
;
3601 /* Detect invalid bit-field type. */
3602 if (TREE_CODE (*type
) != INTEGER_TYPE
3603 && TREE_CODE (*type
) != BOOLEAN_TYPE
3604 && TREE_CODE (*type
) != ENUMERAL_TYPE
)
3606 error ("bit-field `%s' has invalid type", name
);
3607 *type
= unsigned_type_node
;
3610 type_mv
= TYPE_MAIN_VARIANT (*type
);
3612 && type_mv
!= integer_type_node
3613 && type_mv
!= unsigned_type_node
3614 && type_mv
!= boolean_type_node
)
3615 pedwarn ("type of bit-field `%s' is a GCC extension", name
);
3617 if (type_mv
== boolean_type_node
)
3618 max_width
= CHAR_TYPE_SIZE
;
3620 max_width
= TYPE_PRECISION (*type
);
3622 if (0 < compare_tree_int (*width
, max_width
))
3624 error ("width of `%s' exceeds its type", name
);
3626 *width
= build_int_cst (NULL_TREE
, w
);
3629 w
= tree_low_cst (*width
, 1);
3631 if (TREE_CODE (*type
) == ENUMERAL_TYPE
)
3633 struct lang_type
*lt
= TYPE_LANG_SPECIFIC (*type
);
3635 || w
< min_precision (lt
->enum_min
, TYPE_UNSIGNED (*type
))
3636 || w
< min_precision (lt
->enum_max
, TYPE_UNSIGNED (*type
)))
3637 warning ("`%s' is narrower than values of its type", name
);
3641 /* Given declspecs and a declarator,
3642 determine the name and type of the object declared
3643 and construct a ..._DECL node for it.
3644 (In one case we can return a ..._TYPE node instead.
3645 For invalid input we sometimes return 0.)
3647 DECLSPECS is a chain of tree_list nodes whose value fields
3648 are the storage classes and type specifiers.
3650 DECL_CONTEXT says which syntactic context this declaration is in:
3651 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3652 FUNCDEF for a function definition. Like NORMAL but a few different
3653 error messages in each case. Return value may be zero meaning
3654 this definition is too screwy to try to parse.
3655 PARM for a parameter declaration (either within a function prototype
3656 or before a function body). Make a PARM_DECL, or return void_type_node.
3657 TYPENAME if for a typename (in a cast or sizeof).
3658 Don't make a DECL node; just return the ..._TYPE node.
3659 FIELD for a struct or union field; make a FIELD_DECL.
3660 INITIALIZED is true if the decl has an initializer.
3661 WIDTH is non-NULL for bit-fields, and is a pointer to an INTEGER_CST node
3662 representing the width of the bit-field.
3664 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3665 It may also be so in the PARM case, for a prototype where the
3666 argument type is specified but not the name.
3668 This function is where the complicated C meanings of `static'
3669 and `extern' are interpreted. */
3672 grokdeclarator (tree declarator
, tree declspecs
,
3673 enum decl_context decl_context
, bool initialized
, tree
*width
)
3677 tree type
= NULL_TREE
;
3682 int type_quals
= TYPE_UNQUALIFIED
;
3684 int explicit_int
= 0;
3685 int explicit_char
= 0;
3686 int defaulted_int
= 0;
3687 tree typedef_decl
= 0;
3688 const char *name
, *orig_name
;
3689 tree typedef_type
= 0;
3690 int funcdef_flag
= 0;
3691 enum tree_code innermost_code
= ERROR_MARK
;
3692 int size_varies
= 0;
3693 tree decl_attr
= NULL_TREE
;
3694 tree array_ptr_quals
= NULL_TREE
;
3695 int array_parm_static
= 0;
3696 tree returned_attrs
= NULL_TREE
;
3697 bool bitfield
= width
!= NULL
;
3699 tree arg_info
= NULL_TREE
;
3701 if (decl_context
== FUNCDEF
)
3702 funcdef_flag
= 1, decl_context
= NORMAL
;
3704 /* Look inside a declarator for the name being declared
3705 and get it as a string, for an error message. */
3707 tree decl
= declarator
;
3711 switch (TREE_CODE (decl
))
3716 innermost_code
= TREE_CODE (decl
);
3717 decl
= TREE_OPERAND (decl
, 0);
3721 decl
= TREE_VALUE (decl
);
3724 case IDENTIFIER_NODE
:
3725 name
= IDENTIFIER_POINTER (decl
);
3737 /* A function definition's declarator must have the form of
3738 a function declarator. */
3740 if (funcdef_flag
&& innermost_code
!= CALL_EXPR
)
3743 /* If this looks like a function definition, make it one,
3744 even if it occurs where parms are expected.
3745 Then store_parm_decls will reject it and not use it as a parm. */
3746 if (decl_context
== NORMAL
&& !funcdef_flag
&& current_scope
->parm_flag
)
3747 decl_context
= PARM
;
3749 /* Look through the decl specs and record which ones appear.
3750 Some typespecs are defined as built-in typenames.
3751 Others, the ones that are modifiers of other types,
3752 are represented by bits in SPECBITS: set the bits for
3753 the modifiers that appear. Storage class keywords are also in SPECBITS.
3755 If there is a typedef name or a type, store the type in TYPE.
3756 This includes builtin typedefs such as `int'.
3758 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
3759 and did not come from a user typedef.
3761 Set LONGLONG if `long' is mentioned twice. */
3763 for (spec
= declspecs
; spec
; spec
= TREE_CHAIN (spec
))
3765 tree id
= TREE_VALUE (spec
);
3767 /* If the entire declaration is itself tagged as deprecated then
3768 suppress reports of deprecated items. */
3769 if (id
&& TREE_DEPRECATED (id
))
3771 if (deprecated_state
!= DEPRECATED_SUPPRESS
)
3772 warn_deprecated_use (id
);
3775 if (id
== ridpointers
[(int) RID_INT
])
3777 if (id
== ridpointers
[(int) RID_CHAR
])
3780 if (TREE_CODE (id
) == IDENTIFIER_NODE
&& C_IS_RESERVED_WORD (id
))
3782 enum rid i
= C_RID_CODE (id
);
3783 if ((int) i
<= (int) RID_LAST_MODIFIER
)
3785 if (i
== RID_LONG
&& (specbits
& (1 << (int) RID_LONG
)))
3788 error ("`long long long' is too long for GCC");
3791 if (pedantic
&& !flag_isoc99
&& ! in_system_header
3793 pedwarn ("ISO C90 does not support `long long'");
3797 else if (specbits
& (1 << (int) i
))
3799 if (i
== RID_CONST
|| i
== RID_VOLATILE
|| i
== RID_RESTRICT
)
3801 if (pedantic
&& !flag_isoc99
)
3802 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id
));
3805 error ("duplicate `%s'", IDENTIFIER_POINTER (id
));
3808 /* Diagnose "__thread extern". Recall that this list
3809 is in the reverse order seen in the text. */
3811 && (specbits
& (1 << (int) RID_EXTERN
3812 | 1 << (int) RID_STATIC
)))
3814 if (specbits
& 1 << (int) RID_EXTERN
)
3815 error ("`__thread' before `extern'");
3817 error ("`__thread' before `static'");
3820 specbits
|= 1 << (int) i
;
3825 error ("two or more data types in declaration of `%s'", name
);
3826 /* Actual typedefs come to us as TYPE_DECL nodes. */
3827 else if (TREE_CODE (id
) == TYPE_DECL
)
3829 if (TREE_TYPE (id
) == error_mark_node
)
3830 ; /* Allow the type to default to int to avoid cascading errors. */
3833 type
= TREE_TYPE (id
);
3834 decl_attr
= DECL_ATTRIBUTES (id
);
3838 /* Built-in types come as identifiers. */
3839 else if (TREE_CODE (id
) == IDENTIFIER_NODE
)
3841 tree t
= lookup_name (id
);
3842 if (!t
|| TREE_CODE (t
) != TYPE_DECL
)
3843 error ("`%s' fails to be a typedef or built in type",
3844 IDENTIFIER_POINTER (id
));
3845 else if (TREE_TYPE (t
) == error_mark_node
)
3849 type
= TREE_TYPE (t
);
3853 else if (TREE_CODE (id
) != ERROR_MARK
)
3860 typedef_type
= type
;
3862 size_varies
= C_TYPE_VARIABLE_SIZE (type
);
3864 /* No type at all: default to `int', and set DEFAULTED_INT
3865 because it was not a user-defined typedef. */
3869 if ((! (specbits
& ((1 << (int) RID_LONG
) | (1 << (int) RID_SHORT
)
3870 | (1 << (int) RID_SIGNED
)
3871 | (1 << (int) RID_UNSIGNED
)
3872 | (1 << (int) RID_COMPLEX
))))
3873 /* Don't warn about typedef foo = bar. */
3874 && ! (specbits
& (1 << (int) RID_TYPEDEF
) && initialized
)
3875 && ! in_system_header
)
3877 /* Issue a warning if this is an ISO C 99 program or if -Wreturn-type
3878 and this is a function, or if -Wimplicit; prefer the former
3879 warning since it is more explicit. */
3880 if ((warn_implicit_int
|| warn_return_type
|| flag_isoc99
)
3882 warn_about_return_type
= 1;
3883 else if (warn_implicit_int
|| flag_isoc99
)
3884 pedwarn_c99 ("type defaults to `int' in declaration of `%s'",
3889 type
= integer_type_node
;
3892 /* Now process the modifiers that were specified
3893 and check for invalid combinations. */
3895 /* Long double is a special combination. */
3897 if ((specbits
& 1 << (int) RID_LONG
) && ! longlong
3898 && TYPE_MAIN_VARIANT (type
) == double_type_node
)
3900 specbits
&= ~(1 << (int) RID_LONG
);
3901 type
= long_double_type_node
;
3904 /* Check all other uses of type modifiers. */
3906 if (specbits
& ((1 << (int) RID_LONG
) | (1 << (int) RID_SHORT
)
3907 | (1 << (int) RID_UNSIGNED
) | (1 << (int) RID_SIGNED
)))
3911 if ((specbits
& 1 << (int) RID_LONG
)
3912 && (specbits
& 1 << (int) RID_SHORT
))
3913 error ("both long and short specified for `%s'", name
);
3914 else if (((specbits
& 1 << (int) RID_LONG
)
3915 || (specbits
& 1 << (int) RID_SHORT
))
3917 error ("long or short specified with char for `%s'", name
);
3918 else if (((specbits
& 1 << (int) RID_LONG
)
3919 || (specbits
& 1 << (int) RID_SHORT
))
3920 && TREE_CODE (type
) == REAL_TYPE
)
3922 static int already
= 0;
3924 error ("long or short specified with floating type for `%s'", name
);
3925 if (! already
&& ! pedantic
)
3927 error ("the only valid combination is `long double'");
3931 else if ((specbits
& 1 << (int) RID_SIGNED
)
3932 && (specbits
& 1 << (int) RID_UNSIGNED
))
3933 error ("both signed and unsigned specified for `%s'", name
);
3934 else if (TREE_CODE (type
) != INTEGER_TYPE
)
3935 error ("long, short, signed or unsigned invalid for `%s'", name
);
3939 if (!explicit_int
&& !defaulted_int
&& !explicit_char
)
3941 error ("long, short, signed or unsigned used invalidly for `%s'",
3947 /* Discard the type modifiers if they are invalid. */
3950 specbits
&= ~((1 << (int) RID_LONG
) | (1 << (int) RID_SHORT
)
3951 | (1 << (int) RID_UNSIGNED
) | (1 << (int) RID_SIGNED
));
3956 if ((specbits
& (1 << (int) RID_COMPLEX
))
3957 && TREE_CODE (type
) != INTEGER_TYPE
&& TREE_CODE (type
) != REAL_TYPE
)
3959 error ("complex invalid for `%s'", name
);
3960 specbits
&= ~(1 << (int) RID_COMPLEX
);
3963 /* Decide whether an integer type is signed or not.
3964 Optionally treat bit-fields as signed by default. */
3965 if (specbits
& 1 << (int) RID_UNSIGNED
3966 || (bitfield
&& ! flag_signed_bitfields
3967 && (explicit_int
|| defaulted_int
|| explicit_char
3968 /* A typedef for plain `int' without `signed'
3969 can be controlled just like plain `int'. */
3970 || ! (typedef_decl
!= 0
3971 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl
)))
3972 && TREE_CODE (type
) != ENUMERAL_TYPE
3973 && !(specbits
& 1 << (int) RID_SIGNED
)))
3976 type
= long_long_unsigned_type_node
;
3977 else if (specbits
& 1 << (int) RID_LONG
)
3978 type
= long_unsigned_type_node
;
3979 else if (specbits
& 1 << (int) RID_SHORT
)
3980 type
= short_unsigned_type_node
;
3981 else if (type
== char_type_node
)
3982 type
= unsigned_char_type_node
;
3983 else if (typedef_decl
)
3984 type
= c_common_unsigned_type (type
);
3986 type
= unsigned_type_node
;
3988 else if ((specbits
& 1 << (int) RID_SIGNED
)
3989 && type
== char_type_node
)
3990 type
= signed_char_type_node
;
3992 type
= long_long_integer_type_node
;
3993 else if (specbits
& 1 << (int) RID_LONG
)
3994 type
= long_integer_type_node
;
3995 else if (specbits
& 1 << (int) RID_SHORT
)
3996 type
= short_integer_type_node
;
3998 if (specbits
& 1 << (int) RID_COMPLEX
)
4000 if (pedantic
&& !flag_isoc99
)
4001 pedwarn ("ISO C90 does not support complex types");
4002 /* If we just have "complex", it is equivalent to
4003 "complex double", but if any modifiers at all are specified it is
4004 the complex form of TYPE. E.g, "complex short" is
4005 "complex short int". */
4007 if (defaulted_int
&& ! longlong
4008 && ! (specbits
& ((1 << (int) RID_LONG
) | (1 << (int) RID_SHORT
)
4009 | (1 << (int) RID_SIGNED
)
4010 | (1 << (int) RID_UNSIGNED
))))
4013 pedwarn ("ISO C does not support plain `complex' meaning `double complex'");
4014 type
= complex_double_type_node
;
4016 else if (type
== integer_type_node
)
4019 pedwarn ("ISO C does not support complex integer types");
4020 type
= complex_integer_type_node
;
4022 else if (type
== float_type_node
)
4023 type
= complex_float_type_node
;
4024 else if (type
== double_type_node
)
4025 type
= complex_double_type_node
;
4026 else if (type
== long_double_type_node
)
4027 type
= complex_long_double_type_node
;
4031 pedwarn ("ISO C does not support complex integer types");
4032 type
= build_complex_type (type
);
4036 /* Check the type and width of a bit-field. */
4038 check_bitfield_type_and_width (&type
, width
, orig_name
);
4040 /* Figure out the type qualifiers for the declaration. There are
4041 two ways a declaration can become qualified. One is something
4042 like `const int i' where the `const' is explicit. Another is
4043 something like `typedef const int CI; CI i' where the type of the
4044 declaration contains the `const'. A third possibility is that
4045 there is a type qualifier on the element type of a typedefed
4046 array type, in which case we should extract that qualifier so
4047 that c_apply_type_quals_to_decls receives the full list of
4048 qualifiers to work with (C90 is not entirely clear about whether
4049 duplicate qualifiers should be diagnosed in this case, but it
4050 seems most appropriate to do so). */
4051 element_type
= strip_array_types (type
);
4052 constp
= !! (specbits
& 1 << (int) RID_CONST
) + TYPE_READONLY (element_type
);
4054 = !! (specbits
& 1 << (int) RID_RESTRICT
) + TYPE_RESTRICT (element_type
);
4056 = !! (specbits
& 1 << (int) RID_VOLATILE
) + TYPE_VOLATILE (element_type
);
4057 inlinep
= !! (specbits
& (1 << (int) RID_INLINE
));
4058 if (pedantic
&& !flag_isoc99
)
4061 pedwarn ("duplicate `const'");
4063 pedwarn ("duplicate `restrict'");
4065 pedwarn ("duplicate `volatile'");
4067 if (! flag_gen_aux_info
&& (TYPE_QUALS (type
)))
4068 type
= TYPE_MAIN_VARIANT (type
);
4069 type_quals
= ((constp
? TYPE_QUAL_CONST
: 0)
4070 | (restrictp
? TYPE_QUAL_RESTRICT
: 0)
4071 | (volatilep
? TYPE_QUAL_VOLATILE
: 0));
4073 /* Warn if two storage classes are given. Default to `auto'. */
4078 if (specbits
& 1 << (int) RID_AUTO
) nclasses
++;
4079 if (specbits
& 1 << (int) RID_STATIC
) nclasses
++;
4080 if (specbits
& 1 << (int) RID_EXTERN
) nclasses
++;
4081 if (specbits
& 1 << (int) RID_REGISTER
) nclasses
++;
4082 if (specbits
& 1 << (int) RID_TYPEDEF
) nclasses
++;
4084 /* "static __thread" and "extern __thread" are allowed. */
4085 if ((specbits
& (1 << (int) RID_THREAD
4086 | 1 << (int) RID_STATIC
4087 | 1 << (int) RID_EXTERN
)) == (1 << (int) RID_THREAD
))
4090 /* Warn about storage classes that are invalid for certain
4091 kinds of declarations (parameters, typenames, etc.). */
4094 error ("multiple storage classes in declaration of `%s'", name
);
4095 else if (funcdef_flag
4097 & ((1 << (int) RID_REGISTER
)
4098 | (1 << (int) RID_AUTO
)
4099 | (1 << (int) RID_TYPEDEF
)
4100 | (1 << (int) RID_THREAD
))))
4102 if (specbits
& 1 << (int) RID_AUTO
4103 && (pedantic
|| current_scope
== file_scope
))
4104 pedwarn ("function definition declared `auto'");
4105 if (specbits
& 1 << (int) RID_REGISTER
)
4106 error ("function definition declared `register'");
4107 if (specbits
& 1 << (int) RID_TYPEDEF
)
4108 error ("function definition declared `typedef'");
4109 if (specbits
& 1 << (int) RID_THREAD
)
4110 error ("function definition declared `__thread'");
4111 specbits
&= ~((1 << (int) RID_TYPEDEF
) | (1 << (int) RID_REGISTER
)
4112 | (1 << (int) RID_AUTO
) | (1 << (int) RID_THREAD
));
4114 else if (decl_context
!= NORMAL
&& nclasses
> 0)
4116 if (decl_context
== PARM
&& specbits
& 1 << (int) RID_REGISTER
)
4120 switch (decl_context
)
4123 error ("storage class specified for structure field `%s'",
4127 error ("storage class specified for parameter `%s'", name
);
4130 error ("storage class specified for typename");
4133 specbits
&= ~((1 << (int) RID_TYPEDEF
) | (1 << (int) RID_REGISTER
)
4134 | (1 << (int) RID_AUTO
) | (1 << (int) RID_STATIC
)
4135 | (1 << (int) RID_EXTERN
) | (1 << (int) RID_THREAD
));
4138 else if (specbits
& 1 << (int) RID_EXTERN
&& initialized
&& ! funcdef_flag
)
4140 /* `extern' with initialization is invalid if not at file scope. */
4141 if (current_scope
== file_scope
)
4142 warning ("`%s' initialized and declared `extern'", name
);
4144 error ("`%s' has both `extern' and initializer", name
);
4146 else if (current_scope
== file_scope
)
4148 if (specbits
& 1 << (int) RID_AUTO
)
4149 error ("file-scope declaration of `%s' specifies `auto'", name
);
4153 if (specbits
& 1 << (int) RID_EXTERN
&& funcdef_flag
)
4154 error ("nested function `%s' declared `extern'", name
);
4155 else if ((specbits
& (1 << (int) RID_THREAD
4156 | 1 << (int) RID_EXTERN
4157 | 1 << (int) RID_STATIC
))
4158 == (1 << (int) RID_THREAD
))
4160 error ("function-scope `%s' implicitly auto and declared `__thread'",
4162 specbits
&= ~(1 << (int) RID_THREAD
);
4167 /* Now figure out the structure of the declarator proper.
4168 Descend through it, creating more complex types, until we reach
4169 the declared identifier (or NULL_TREE, in an absolute declarator). */
4171 while (declarator
&& TREE_CODE (declarator
) != IDENTIFIER_NODE
)
4173 if (type
== error_mark_node
)
4175 declarator
= TREE_OPERAND (declarator
, 0);
4179 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
4180 an INDIRECT_REF (for *...),
4181 a CALL_EXPR (for ...(...)),
4182 a TREE_LIST (for nested attributes),
4183 an identifier (for the name being declared)
4184 or a null pointer (for the place in an absolute declarator
4185 where the name was omitted).
4186 For the last two cases, we have just exited the loop.
4188 At this point, TYPE is the type of elements of an array,
4189 or for a function to return, or for a pointer to point to.
4190 After this sequence of ifs, TYPE is the type of the
4191 array or function or pointer, and DECLARATOR has had its
4192 outermost layer removed. */
4194 if (array_ptr_quals
!= NULL_TREE
|| array_parm_static
)
4196 /* Only the innermost declarator (making a parameter be of
4197 array type which is converted to pointer type)
4198 may have static or type qualifiers. */
4199 error ("static or type qualifiers in non-parameter array declarator");
4200 array_ptr_quals
= NULL_TREE
;
4201 array_parm_static
= 0;
4204 switch (TREE_CODE (declarator
))
4208 /* We encode a declarator with embedded attributes using a
4210 tree attrs
= TREE_PURPOSE (declarator
);
4213 declarator
= TREE_VALUE (declarator
);
4214 inner_decl
= declarator
;
4215 while (inner_decl
!= NULL_TREE
4216 && TREE_CODE (inner_decl
) == TREE_LIST
)
4217 inner_decl
= TREE_VALUE (inner_decl
);
4218 if (inner_decl
== NULL_TREE
4219 || TREE_CODE (inner_decl
) == IDENTIFIER_NODE
)
4220 attr_flags
|= (int) ATTR_FLAG_DECL_NEXT
;
4221 else if (TREE_CODE (inner_decl
) == CALL_EXPR
)
4222 attr_flags
|= (int) ATTR_FLAG_FUNCTION_NEXT
;
4223 else if (TREE_CODE (inner_decl
) == ARRAY_REF
)
4224 attr_flags
|= (int) ATTR_FLAG_ARRAY_NEXT
;
4225 returned_attrs
= decl_attributes (&type
,
4226 chainon (returned_attrs
, attrs
),
4232 tree itype
= NULL_TREE
;
4233 tree size
= TREE_OPERAND (declarator
, 1);
4234 /* The index is a signed object `sizetype' bits wide. */
4235 tree index_type
= c_common_signed_type (sizetype
);
4237 array_ptr_quals
= TREE_TYPE (declarator
);
4238 array_parm_static
= TREE_STATIC (declarator
);
4240 declarator
= TREE_OPERAND (declarator
, 0);
4242 /* Check for some types that there cannot be arrays of. */
4244 if (VOID_TYPE_P (type
))
4246 error ("declaration of `%s' as array of voids", name
);
4247 type
= error_mark_node
;
4250 if (TREE_CODE (type
) == FUNCTION_TYPE
)
4252 error ("declaration of `%s' as array of functions", name
);
4253 type
= error_mark_node
;
4256 if (pedantic
&& !in_system_header
&& flexible_array_type_p (type
))
4257 pedwarn ("invalid use of structure with flexible array member");
4259 if (size
== error_mark_node
)
4260 type
= error_mark_node
;
4262 if (type
== error_mark_node
)
4265 /* If size was specified, set ITYPE to a range-type for
4266 that size. Otherwise, ITYPE remains null. finish_decl
4267 may figure it out from an initial value. */
4271 /* Strip NON_LVALUE_EXPRs since we aren't using as an
4273 STRIP_TYPE_NOPS (size
);
4275 if (! INTEGRAL_TYPE_P (TREE_TYPE (size
)))
4277 error ("size of array `%s' has non-integer type", name
);
4278 size
= integer_one_node
;
4281 if (pedantic
&& integer_zerop (size
))
4282 pedwarn ("ISO C forbids zero-size array `%s'", name
);
4284 if (TREE_CODE (size
) == INTEGER_CST
)
4286 constant_expression_warning (size
);
4287 if (tree_int_cst_sgn (size
) < 0)
4289 error ("size of array `%s' is negative", name
);
4290 size
= integer_one_node
;
4295 /* Make sure the array size remains visibly
4296 nonconstant even if it is (eg) a const variable
4297 with known value. */
4300 if (!flag_isoc99
&& pedantic
)
4302 if (TREE_CONSTANT (size
))
4303 pedwarn ("ISO C90 forbids array `%s' whose size can't be evaluated",
4306 pedwarn ("ISO C90 forbids variable-size array `%s'",
4311 if (integer_zerop (size
))
4313 /* A zero-length array cannot be represented with
4314 an unsigned index type, which is what we'll
4315 get with build_index_type. Create an
4316 open-ended range instead. */
4317 itype
= build_range_type (sizetype
, size
, NULL_TREE
);
4321 /* Compute the maximum valid index, that is, size
4322 - 1. Do the calculation in index_type, so that
4323 if it is a variable the computations will be
4324 done in the proper mode. */
4325 itype
= fold (build2 (MINUS_EXPR
, index_type
,
4326 convert (index_type
, size
),
4327 convert (index_type
,
4330 /* If that overflowed, the array is too big. ???
4331 While a size of INT_MAX+1 technically shouldn't
4332 cause an overflow (because we subtract 1), the
4333 overflow is recorded during the conversion to
4334 index_type, before the subtraction. Handling
4335 this case seems like an unnecessary
4337 if (TREE_OVERFLOW (itype
))
4339 error ("size of array `%s' is too large", name
);
4340 type
= error_mark_node
;
4345 itype
= variable_size (itype
);
4346 itype
= build_index_type (itype
);
4349 else if (decl_context
== FIELD
)
4351 if (pedantic
&& !flag_isoc99
&& !in_system_header
)
4352 pedwarn ("ISO C90 does not support flexible array members");
4354 /* ISO C99 Flexible array members are effectively
4355 identical to GCC's zero-length array extension. */
4356 itype
= build_range_type (sizetype
, size_zero_node
, NULL_TREE
);
4359 /* If pedantic, complain about arrays of incomplete types. */
4360 if (pedantic
&& !COMPLETE_TYPE_P (type
))
4361 pedwarn ("array type has incomplete element type");
4363 /* Build the array type itself, then merge any constancy
4364 or volatility into the target type. We must do it in
4365 this order to ensure that the TYPE_MAIN_VARIANT field
4366 of the array type is set correctly. */
4367 type
= build_array_type (type
, itype
);
4369 type
= c_build_qualified_type (type
, type_quals
);
4372 C_TYPE_VARIABLE_SIZE (type
) = 1;
4374 /* The GCC extension for zero-length arrays differs from
4375 ISO flexible array members in that sizeof yields
4377 if (size
&& integer_zerop (size
))
4380 TYPE_SIZE (type
) = bitsize_zero_node
;
4381 TYPE_SIZE_UNIT (type
) = size_zero_node
;
4383 else if (declarator
&& TREE_CODE (declarator
) == INDIRECT_REF
)
4384 /* We can never complete an array type which is the
4385 target of a pointer, so go ahead and lay it out. */
4388 if (decl_context
!= PARM
4389 && (array_ptr_quals
!= NULL_TREE
|| array_parm_static
))
4391 error ("static or type qualifiers in non-parameter array declarator");
4392 array_ptr_quals
= NULL_TREE
;
4393 array_parm_static
= 0;
4399 /* Say it's a definition only for the declarator closest
4400 to the identifier, apart possibly from some
4402 bool really_funcdef
= false;
4406 tree t
= TREE_OPERAND (declarator
, 0);
4407 while (TREE_CODE (t
) == TREE_LIST
)
4409 really_funcdef
= (TREE_CODE (t
) == IDENTIFIER_NODE
);
4412 /* Declaring a function type. Make sure we have a valid
4413 type for the function to return. */
4414 if (type
== error_mark_node
)
4419 /* Warn about some types functions can't return. */
4420 if (TREE_CODE (type
) == FUNCTION_TYPE
)
4422 error ("`%s' declared as function returning a function", name
);
4423 type
= integer_type_node
;
4425 if (TREE_CODE (type
) == ARRAY_TYPE
)
4427 error ("`%s' declared as function returning an array", name
);
4428 type
= integer_type_node
;
4431 /* Construct the function type and go to the next
4432 inner layer of declarator. */
4433 arg_info
= TREE_OPERAND (declarator
, 1);
4434 arg_types
= grokparms (arg_info
, really_funcdef
);
4436 /* Type qualifiers before the return type of the function
4437 qualify the return type, not the function type. */
4440 /* Type qualifiers on a function return type are
4441 normally permitted by the standard but have no
4442 effect, so give a warning at -Wreturn-type.
4443 Qualifiers on a void return type are banned on
4444 function definitions in ISO C; GCC used to used
4445 them for noreturn functions. */
4446 if (VOID_TYPE_P (type
) && really_funcdef
)
4447 pedwarn ("function definition has qualified void return type");
4448 else if (warn_return_type
)
4449 warning ("type qualifiers ignored on function return type");
4451 type
= c_build_qualified_type (type
, type_quals
);
4453 type_quals
= TYPE_UNQUALIFIED
;
4455 type
= build_function_type (type
, arg_types
);
4456 declarator
= TREE_OPERAND (declarator
, 0);
4458 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4459 the formal parameter list of this FUNCTION_TYPE to point to
4460 the FUNCTION_TYPE node itself. */
4464 for (link
= ARG_INFO_TAGS (arg_info
);
4466 link
= TREE_CHAIN (link
))
4467 TYPE_CONTEXT (TREE_VALUE (link
)) = type
;
4473 /* Merge any constancy or volatility into the target type
4476 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
4478 pedwarn ("ISO C forbids qualified function types");
4480 type
= c_build_qualified_type (type
, type_quals
);
4481 type_quals
= TYPE_UNQUALIFIED
;
4484 type
= build_pointer_type (type
);
4486 /* Process a list of type modifier keywords (such as const
4487 or volatile) that were given inside the `*'. */
4488 if (TREE_TYPE (declarator
))
4496 for (typemodlist
= TREE_TYPE (declarator
); typemodlist
;
4497 typemodlist
= TREE_CHAIN (typemodlist
))
4499 tree qualifier
= TREE_VALUE (typemodlist
);
4501 if (C_IS_RESERVED_WORD (qualifier
))
4503 if (C_RID_CODE (qualifier
) == RID_CONST
)
4505 else if (C_RID_CODE (qualifier
) == RID_VOLATILE
)
4507 else if (C_RID_CODE (qualifier
) == RID_RESTRICT
)
4517 error ("invalid type modifier within pointer declarator");
4518 if (pedantic
&& !flag_isoc99
)
4521 pedwarn ("duplicate `const'");
4523 pedwarn ("duplicate `volatile'");
4525 pedwarn ("duplicate `restrict'");
4528 type_quals
= ((constp
? TYPE_QUAL_CONST
: 0)
4529 | (restrictp
? TYPE_QUAL_RESTRICT
: 0)
4530 | (volatilep
? TYPE_QUAL_VOLATILE
: 0));
4533 declarator
= TREE_OPERAND (declarator
, 0);
4541 /* Now TYPE has the actual type. */
4543 /* Did array size calculations overflow? */
4545 if (TREE_CODE (type
) == ARRAY_TYPE
4546 && COMPLETE_TYPE_P (type
)
4547 && TREE_OVERFLOW (TYPE_SIZE (type
)))
4549 error ("size of array `%s' is too large", name
);
4550 /* If we proceed with the array type as it is, we'll eventually
4551 crash in tree_low_cst(). */
4552 type
= error_mark_node
;
4555 /* If this is declaring a typedef name, return a TYPE_DECL. */
4557 if (specbits
& (1 << (int) RID_TYPEDEF
))
4560 /* Note that the grammar rejects storage classes
4561 in typenames, fields or parameters */
4562 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
4564 pedwarn ("ISO C forbids qualified function types");
4566 type
= c_build_qualified_type (type
, type_quals
);
4567 decl
= build_decl (TYPE_DECL
, declarator
, type
);
4568 if ((specbits
& (1 << (int) RID_SIGNED
))
4569 || (typedef_decl
&& C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl
)))
4570 C_TYPEDEF_EXPLICITLY_SIGNED (decl
) = 1;
4571 decl_attributes (&decl
, returned_attrs
, 0);
4575 /* Detect the case of an array type of unspecified size
4576 which came, as such, direct from a typedef name.
4577 We must copy the type, so that each identifier gets
4578 a distinct type, so that each identifier's size can be
4579 controlled separately by its own initializer. */
4581 if (type
!= 0 && typedef_type
!= 0
4582 && TREE_CODE (type
) == ARRAY_TYPE
&& TYPE_DOMAIN (type
) == 0
4583 && TYPE_MAIN_VARIANT (type
) == TYPE_MAIN_VARIANT (typedef_type
))
4585 type
= build_array_type (TREE_TYPE (type
), 0);
4587 C_TYPE_VARIABLE_SIZE (type
) = 1;
4590 /* If this is a type name (such as, in a cast or sizeof),
4591 compute the type and return it now. */
4593 if (decl_context
== TYPENAME
)
4595 /* Note that the grammar rejects storage classes
4596 in typenames, fields or parameters */
4597 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
4599 pedwarn ("ISO C forbids const or volatile function types");
4601 type
= c_build_qualified_type (type
, type_quals
);
4602 decl_attributes (&type
, returned_attrs
, 0);
4606 /* Aside from typedefs and type names (handle above),
4607 `void' at top level (not within pointer)
4608 is allowed only in public variables.
4609 We don't complain about parms either, but that is because
4610 a better error message can be made later. */
4612 if (VOID_TYPE_P (type
) && decl_context
!= PARM
4613 && ! ((decl_context
!= FIELD
&& TREE_CODE (type
) != FUNCTION_TYPE
)
4614 && ((specbits
& (1 << (int) RID_EXTERN
))
4615 || (current_scope
== file_scope
4617 & ((1 << (int) RID_STATIC
) | (1 << (int) RID_REGISTER
)))))))
4619 error ("variable or field `%s' declared void", name
);
4620 type
= integer_type_node
;
4623 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4624 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4629 if (decl_context
== PARM
)
4631 tree type_as_written
;
4634 /* A parameter declared as an array of T is really a pointer to T.
4635 One declared as a function is really a pointer to a function. */
4637 if (TREE_CODE (type
) == ARRAY_TYPE
)
4639 /* Transfer const-ness of array into that of type pointed to. */
4640 type
= TREE_TYPE (type
);
4642 type
= c_build_qualified_type (type
, type_quals
);
4643 type
= build_pointer_type (type
);
4644 type_quals
= TYPE_UNQUALIFIED
;
4645 if (array_ptr_quals
)
4647 tree new_ptr_quals
, new_ptr_attrs
;
4649 split_specs_attrs (array_ptr_quals
, &new_ptr_quals
, &new_ptr_attrs
);
4650 /* We don't yet implement attributes in this context. */
4651 if (new_ptr_attrs
!= NULL_TREE
)
4652 warning ("attributes in parameter array declarator ignored");
4657 for (; new_ptr_quals
; new_ptr_quals
= TREE_CHAIN (new_ptr_quals
))
4659 tree qualifier
= TREE_VALUE (new_ptr_quals
);
4661 if (C_IS_RESERVED_WORD (qualifier
))
4663 if (C_RID_CODE (qualifier
) == RID_CONST
)
4665 else if (C_RID_CODE (qualifier
) == RID_VOLATILE
)
4667 else if (C_RID_CODE (qualifier
) == RID_RESTRICT
)
4677 error ("invalid type modifier within array declarator");
4679 type_quals
= ((constp
? TYPE_QUAL_CONST
: 0)
4680 | (restrictp
? TYPE_QUAL_RESTRICT
: 0)
4681 | (volatilep
? TYPE_QUAL_VOLATILE
: 0));
4685 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
4687 if (pedantic
&& type_quals
)
4688 pedwarn ("ISO C forbids qualified function types");
4690 type
= c_build_qualified_type (type
, type_quals
);
4691 type
= build_pointer_type (type
);
4692 type_quals
= TYPE_UNQUALIFIED
;
4694 else if (type_quals
)
4695 type
= c_build_qualified_type (type
, type_quals
);
4697 type_as_written
= type
;
4699 decl
= build_decl (PARM_DECL
, declarator
, type
);
4701 C_DECL_VARIABLE_SIZE (decl
) = 1;
4703 /* Compute the type actually passed in the parmlist,
4704 for the case where there is no prototype.
4705 (For example, shorts and chars are passed as ints.)
4706 When there is a prototype, this is overridden later. */
4708 if (type
== error_mark_node
)
4709 promoted_type
= type
;
4711 promoted_type
= c_type_promotes_to (type
);
4713 DECL_ARG_TYPE (decl
) = promoted_type
;
4714 DECL_ARG_TYPE_AS_WRITTEN (decl
) = type_as_written
;
4716 else if (decl_context
== FIELD
)
4718 /* Structure field. It may not be a function. */
4720 if (TREE_CODE (type
) == FUNCTION_TYPE
)
4722 error ("field `%s' declared as a function", name
);
4723 type
= build_pointer_type (type
);
4725 else if (TREE_CODE (type
) != ERROR_MARK
4726 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type
))
4728 error ("field `%s' has incomplete type", name
);
4729 type
= error_mark_node
;
4731 /* Move type qualifiers down to element of an array. */
4732 if (TREE_CODE (type
) == ARRAY_TYPE
&& type_quals
)
4733 type
= build_array_type (c_build_qualified_type (TREE_TYPE (type
),
4735 TYPE_DOMAIN (type
));
4736 decl
= build_decl (FIELD_DECL
, declarator
, type
);
4737 DECL_NONADDRESSABLE_P (decl
) = bitfield
;
4740 C_DECL_VARIABLE_SIZE (decl
) = 1;
4742 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
4744 if (specbits
& (1 << (int) RID_REGISTER
)
4745 || specbits
& (1 << (int) RID_THREAD
))
4746 error ("invalid storage class for function `%s'", name
);
4747 else if (current_scope
!= file_scope
)
4749 /* Function declaration not at file scope. Storage
4750 classes other than `extern' are not allowed, C99
4751 6.7.1p5, and `extern' makes no difference. However,
4752 GCC allows 'auto', perhaps with 'inline', to support
4753 nested functions. */
4754 if (specbits
& (1 << (int) RID_AUTO
))
4757 pedwarn ("invalid storage class for function `%s'", name
);
4759 if (specbits
& (1 << (int) RID_STATIC
))
4760 error ("invalid storage class for function `%s'", name
);
4763 decl
= build_decl (FUNCTION_DECL
, declarator
, type
);
4764 decl
= build_decl_attribute_variant (decl
, decl_attr
);
4766 DECL_LANG_SPECIFIC (decl
) = GGC_CNEW (struct lang_decl
);
4768 if (pedantic
&& type_quals
&& ! DECL_IN_SYSTEM_HEADER (decl
))
4769 pedwarn ("ISO C forbids qualified function types");
4771 /* GNU C interprets a volatile-qualified function type to indicate
4772 that the function does not return. */
4773 if ((type_quals
& TYPE_QUAL_VOLATILE
)
4774 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl
))))
4775 warning ("`noreturn' function returns non-void value");
4777 /* Every function declaration is an external reference
4778 (DECL_EXTERNAL) except for those which are not at file
4779 scope and are explicitly declared "auto". This is
4780 forbidden by standard C (C99 6.7.1p5) and is interpreted by
4781 GCC to signify a forward declaration of a nested function. */
4782 if ((specbits
& (1 << RID_AUTO
)) && current_scope
!= file_scope
)
4783 DECL_EXTERNAL (decl
) = 0;
4785 DECL_EXTERNAL (decl
) = 1;
4787 /* Record absence of global scope for `static' or `auto'. */
4789 = !(specbits
& ((1 << (int) RID_STATIC
) | (1 << (int) RID_AUTO
)));
4791 /* For a function definition, record the argument information
4792 block where store_parm_decls will look for it. */
4794 current_function_arg_info
= arg_info
;
4797 C_FUNCTION_IMPLICIT_INT (decl
) = 1;
4799 /* Record presence of `inline', if it is reasonable. */
4800 if (MAIN_NAME_P (declarator
))
4803 warning ("cannot inline function `main'");
4807 /* Record that the function is declared `inline'. */
4808 DECL_DECLARED_INLINE_P (decl
) = 1;
4810 /* Do not mark bare declarations as DECL_INLINE. Doing so
4811 in the presence of multiple declarations can result in
4812 the abstract origin pointing between the declarations,
4813 which will confuse dwarf2out. */
4816 DECL_INLINE (decl
) = 1;
4817 if (specbits
& (1 << (int) RID_EXTERN
))
4818 current_extern_inline
= 1;
4821 /* If -finline-functions, assume it can be inlined. This does
4822 two things: let the function be deferred until it is actually
4823 needed, and let dwarf2 know that the function is inlinable. */
4824 else if (flag_inline_trees
== 2 && initialized
)
4825 DECL_INLINE (decl
) = 1;
4829 /* It's a variable. */
4830 /* An uninitialized decl with `extern' is a reference. */
4831 int extern_ref
= !initialized
&& (specbits
& (1 << (int) RID_EXTERN
));
4833 /* Move type qualifiers down to element of an array. */
4834 if (TREE_CODE (type
) == ARRAY_TYPE
&& type_quals
)
4836 int saved_align
= TYPE_ALIGN(type
);
4837 type
= build_array_type (c_build_qualified_type (TREE_TYPE (type
),
4839 TYPE_DOMAIN (type
));
4840 TYPE_ALIGN (type
) = saved_align
;
4842 else if (type_quals
)
4843 type
= c_build_qualified_type (type
, type_quals
);
4845 /* C99 6.2.2p7: It is invalid (compile-time undefined
4846 behavior) to create an 'extern' declaration for a
4847 variable if there is a global declaration that is
4848 'static' and the global declaration is not visible.
4849 (If the static declaration _is_ currently visible,
4850 the 'extern' declaration is taken to refer to that decl.) */
4851 if (extern_ref
&& current_scope
!= file_scope
)
4853 tree global_decl
= identifier_global_value (declarator
);
4854 tree visible_decl
= lookup_name (declarator
);
4857 && global_decl
!= visible_decl
4858 && TREE_CODE (global_decl
) == VAR_DECL
4859 && !TREE_PUBLIC (global_decl
))
4860 error ("variable previously declared 'static' redeclared "
4864 decl
= build_decl (VAR_DECL
, declarator
, type
);
4866 C_DECL_VARIABLE_SIZE (decl
) = 1;
4869 pedwarn ("%Jvariable '%D' declared `inline'", decl
, decl
);
4871 /* At file scope, an initialized extern declaration may follow
4872 a static declaration. In that case, DECL_EXTERNAL will be
4873 reset later in start_decl. */
4874 DECL_EXTERNAL (decl
) = !!(specbits
& (1 << (int) RID_EXTERN
));
4876 /* At file scope, the presence of a `static' or `register' storage
4877 class specifier, or the absence of all storage class specifiers
4878 makes this declaration a definition (perhaps tentative). Also,
4879 the absence of both `static' and `register' makes it public. */
4880 if (current_scope
== file_scope
)
4882 TREE_PUBLIC (decl
) = !(specbits
& ((1 << (int) RID_STATIC
)
4883 | (1 << (int) RID_REGISTER
)));
4884 TREE_STATIC (decl
) = !extern_ref
;
4886 /* Not at file scope, only `static' makes a static definition. */
4889 TREE_STATIC (decl
) = (specbits
& (1 << (int) RID_STATIC
)) != 0;
4890 TREE_PUBLIC (decl
) = extern_ref
;
4893 if (specbits
& 1 << (int) RID_THREAD
)
4895 if (targetm
.have_tls
)
4896 DECL_THREAD_LOCAL (decl
) = 1;
4898 /* A mere warning is sure to result in improper semantics
4899 at runtime. Don't bother to allow this to compile. */
4900 error ("thread-local storage not supported for this target");
4904 /* Record `register' declaration for warnings on &
4905 and in case doing stupid register allocation. */
4907 if (specbits
& (1 << (int) RID_REGISTER
))
4909 C_DECL_REGISTER (decl
) = 1;
4910 DECL_REGISTER (decl
) = 1;
4913 /* Record constancy and volatility. */
4914 c_apply_type_quals_to_decl (type_quals
, decl
);
4916 /* If a type has volatile components, it should be stored in memory.
4917 Otherwise, the fact that those components are volatile
4918 will be ignored, and would even crash the compiler. */
4919 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl
)))
4921 /* It is not an error for a structure with volatile fields to
4922 be declared register, but reset DECL_REGISTER since it
4923 cannot actually go in a register. */
4924 int was_reg
= C_DECL_REGISTER (decl
);
4925 C_DECL_REGISTER (decl
) = 0;
4926 DECL_REGISTER (decl
) = 0;
4927 c_mark_addressable (decl
);
4928 C_DECL_REGISTER (decl
) = was_reg
;
4931 /* This is the earliest point at which we might know the assembler
4932 name of a variable. Thus, if it's known before this, die horribly. */
4933 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl
));
4935 decl_attributes (&decl
, returned_attrs
, 0);
4941 /* Decode the parameter-list info for a function type or function definition.
4942 The argument is the value returned by `get_parm_info' (or made in parse.y
4943 if there is an identifier list instead of a parameter decl list).
4944 These two functions are separate because when a function returns
4945 or receives functions then each is called multiple times but the order
4946 of calls is different. The last call to `grokparms' is always the one
4947 that contains the formal parameter names of a function definition.
4949 Return a list of arg types to use in the FUNCTION_TYPE for this function.
4951 FUNCDEF_FLAG is true for a function definition, false for
4952 a mere declaration. A nonempty identifier-list gets an error message
4953 when FUNCDEF_FLAG is false. */
4956 grokparms (tree arg_info
, bool funcdef_flag
)
4958 tree arg_types
= ARG_INFO_TYPES (arg_info
);
4960 if (warn_strict_prototypes
&& arg_types
== 0 && !funcdef_flag
4961 && !in_system_header
)
4962 warning ("function declaration isn't a prototype");
4964 if (arg_types
== error_mark_node
)
4965 return 0; /* don't set TYPE_ARG_TYPES in this case */
4967 else if (arg_types
&& TREE_CODE (TREE_VALUE (arg_types
)) == IDENTIFIER_NODE
)
4970 pedwarn ("parameter names (without types) in function declaration");
4972 ARG_INFO_PARMS (arg_info
) = ARG_INFO_TYPES (arg_info
);
4973 ARG_INFO_TYPES (arg_info
) = 0;
4978 tree parm
, type
, typelt
;
4979 unsigned int parmno
;
4981 /* If the arg types are incomplete in a declaration, they must
4982 include undefined tags. These tags can never be defined in
4983 the scope of the declaration, so the types can never be
4984 completed, and no call can be compiled successfully. */
4986 for (parm
= ARG_INFO_PARMS (arg_info
), typelt
= arg_types
, parmno
= 1;
4988 parm
= TREE_CHAIN (parm
), typelt
= TREE_CHAIN (typelt
), parmno
++)
4990 type
= TREE_VALUE (typelt
);
4991 if (type
== error_mark_node
)
4994 if (!COMPLETE_TYPE_P (type
))
4998 if (DECL_NAME (parm
))
4999 error ("%Jparameter %u ('%D') has incomplete type",
5000 parm
, parmno
, parm
);
5002 error ("%Jparameter %u has incomplete type",
5005 TREE_VALUE (typelt
) = error_mark_node
;
5006 TREE_TYPE (parm
) = error_mark_node
;
5010 if (DECL_NAME (parm
))
5011 warning ("%Jparameter %u ('%D') has incomplete type",
5012 parm
, parmno
, parm
);
5014 warning ("%Jparameter %u has incomplete type",
5023 /* Take apart the current scope and return a tree_list node with info
5024 on a parameter list just parsed. This tree_list node should be
5025 examined using the ARG_INFO_* macros, defined above:
5027 ARG_INFO_PARMS: a list of parameter decls.
5028 ARG_INFO_TAGS: a list of structure, union and enum tags defined.
5029 ARG_INFO_TYPES: a list of argument types to go in the FUNCTION_TYPE.
5030 ARG_INFO_OTHERS: a list of non-parameter decls (notably enumeration
5031 constants) defined with the parameters.
5033 This tree_list node is later fed to 'grokparms' and 'store_parm_decls'.
5035 ELLIPSIS being true means the argument list ended in '...' so don't
5036 append a sentinel (void_list_node) to the end of the type-list. */
5039 get_parm_info (bool ellipsis
)
5041 struct c_binding
*b
= current_scope
->bindings
;
5042 tree arg_info
= make_node (TREE_LIST
);
5048 static bool explained_incomplete_types
= false;
5049 bool gave_void_only_once_err
= false;
5051 /* The bindings in this scope must not get put into a block.
5052 We will take care of deleting the binding nodes. */
5053 current_scope
->bindings
= 0;
5055 /* This function is only called if there was *something* on the
5059 /* A parameter list consisting solely of 'void' indicates that the
5060 function takes no arguments. But if the 'void' is qualified
5061 (by 'const' or 'volatile'), or has a storage class specifier
5062 ('register'), then the behavior is undefined; issue an error.
5063 Typedefs for 'void' are OK (see DR#157). */
5064 if (b
->prev
== 0 /* one binding */
5065 && TREE_CODE (b
->decl
) == PARM_DECL
/* which is a parameter */
5066 && !DECL_NAME (b
->decl
) /* anonymous */
5067 && VOID_TYPE_P (TREE_TYPE (b
->decl
))) /* of void type */
5069 if (TREE_THIS_VOLATILE (b
->decl
)
5070 || TREE_READONLY (b
->decl
)
5071 || C_DECL_REGISTER (b
->decl
))
5072 error ("'void' as only parameter may not be qualified");
5074 /* There cannot be an ellipsis. */
5076 error ("'void' must be the only parameter");
5078 ARG_INFO_TYPES (arg_info
) = void_list_node
;
5083 types
= void_list_node
;
5085 /* Break up the bindings list into parms, tags, types, and others;
5086 apply sanity checks; purge the name-to-decl bindings. */
5089 tree decl
= b
->decl
;
5090 tree type
= TREE_TYPE (decl
);
5091 const char *keyword
;
5093 switch (TREE_CODE (decl
))
5098 gcc_assert (I_SYMBOL_BINDING (b
->id
) == b
);
5099 I_SYMBOL_BINDING (b
->id
) = b
->shadowed
;
5102 /* Check for forward decls that never got their actual decl. */
5103 if (TREE_ASM_WRITTEN (decl
))
5104 error ("%Jparameter '%D' has just a forward declaration",
5106 /* Check for (..., void, ...) and issue an error. */
5107 else if (VOID_TYPE_P (type
) && !DECL_NAME (decl
))
5109 if (!gave_void_only_once_err
)
5111 error ("'void' must be the only parameter");
5112 gave_void_only_once_err
= true;
5117 /* Valid parameter, add it to the list. */
5118 TREE_CHAIN (decl
) = parms
;
5121 /* Since there is a prototype, args are passed in their
5122 declared types. The back end may override this later. */
5123 DECL_ARG_TYPE (decl
) = type
;
5124 types
= tree_cons (0, type
, types
);
5128 case ENUMERAL_TYPE
: keyword
= "enum"; goto tag
;
5129 case UNION_TYPE
: keyword
= "union"; goto tag
;
5130 case RECORD_TYPE
: keyword
= "struct"; goto tag
;
5132 /* Types may not have tag-names, in which case the type
5133 appears in the bindings list with b->id NULL. */
5136 gcc_assert (I_TAG_BINDING (b
->id
) == b
);
5137 I_TAG_BINDING (b
->id
) = b
->shadowed
;
5140 /* Warn about any struct, union or enum tags defined in a
5141 parameter list. The scope of such types is limited to
5142 the parameter list, which is rarely if ever desirable
5143 (it's impossible to call such a function with type-
5144 correct arguments). An anonymous union parm type is
5145 meaningful as a GNU extension, so don't warn for that. */
5146 if (TREE_CODE (decl
) != UNION_TYPE
|| b
->id
!= 0)
5149 /* The %s will be one of 'struct', 'union', or 'enum'. */
5150 warning ("'%s %E' declared inside parameter list",
5153 /* The %s will be one of 'struct', 'union', or 'enum'. */
5154 warning ("anonymous %s declared inside parameter list",
5157 if (! explained_incomplete_types
)
5159 warning ("its scope is only this definition or declaration,"
5160 " which is probably not what you want");
5161 explained_incomplete_types
= true;
5165 tags
= tree_cons (b
->id
, decl
, tags
);
5170 /* CONST_DECLs appear here when we have an embedded enum,
5171 and TYPE_DECLs appear here when we have an embedded struct
5172 or union. No warnings for this - we already warned about the
5174 TREE_CHAIN (decl
) = others
;
5179 /* error_mark_node appears here when we have an undeclared
5180 variable. Just throw it away. */
5183 gcc_assert (I_SYMBOL_BINDING (b
->id
) == b
);
5184 I_SYMBOL_BINDING (b
->id
) = b
->shadowed
;
5188 /* Other things that might be encountered. */
5196 b
= free_binding_and_advance (b
);
5199 ARG_INFO_PARMS (arg_info
) = parms
;
5200 ARG_INFO_TAGS (arg_info
) = tags
;
5201 ARG_INFO_TYPES (arg_info
) = types
;
5202 ARG_INFO_OTHERS (arg_info
) = others
;
5206 /* Get the struct, enum or union (CODE says which) with tag NAME.
5207 Define the tag as a forward-reference if it is not defined. */
5210 xref_tag (enum tree_code code
, tree name
)
5212 /* If a cross reference is requested, look up the type
5213 already defined for this tag and return it. */
5215 tree ref
= lookup_tag (code
, name
, 0);
5216 /* If this is the right type of tag, return what we found.
5217 (This reference will be shadowed by shadow_tag later if appropriate.)
5218 If this is the wrong type of tag, do not return it. If it was the
5219 wrong type in the same scope, we will have had an error
5220 message already; if in a different scope and declaring
5221 a name, pending_xref_error will give an error message; but if in a
5222 different scope and not declaring a name, this tag should
5223 shadow the previous declaration of a different type of tag, and
5224 this would not work properly if we return the reference found.
5225 (For example, with "struct foo" in an outer scope, "union foo;"
5226 must shadow that tag with a new one of union type.) */
5227 if (ref
&& TREE_CODE (ref
) == code
)
5230 /* If no such tag is yet defined, create a forward-reference node
5231 and record it as the "definition".
5232 When a real declaration of this type is found,
5233 the forward-reference will be altered into a real type. */
5235 ref
= make_node (code
);
5236 if (code
== ENUMERAL_TYPE
)
5238 /* Give the type a default layout like unsigned int
5239 to avoid crashing if it does not get defined. */
5240 TYPE_MODE (ref
) = TYPE_MODE (unsigned_type_node
);
5241 TYPE_ALIGN (ref
) = TYPE_ALIGN (unsigned_type_node
);
5242 TYPE_USER_ALIGN (ref
) = 0;
5243 TYPE_UNSIGNED (ref
) = 1;
5244 TYPE_PRECISION (ref
) = TYPE_PRECISION (unsigned_type_node
);
5245 TYPE_MIN_VALUE (ref
) = TYPE_MIN_VALUE (unsigned_type_node
);
5246 TYPE_MAX_VALUE (ref
) = TYPE_MAX_VALUE (unsigned_type_node
);
5249 pushtag (name
, ref
);
5254 /* Make sure that the tag NAME is defined *in the current scope*
5255 at least as a forward reference.
5256 CODE says which kind of tag NAME ought to be. */
5259 start_struct (enum tree_code code
, tree name
)
5261 /* If there is already a tag defined at this scope
5262 (as a forward reference), just return it. */
5267 ref
= lookup_tag (code
, name
, 1);
5268 if (ref
&& TREE_CODE (ref
) == code
)
5270 if (TYPE_FIELDS (ref
))
5272 if (code
== UNION_TYPE
)
5273 error ("redefinition of `union %s'", IDENTIFIER_POINTER (name
));
5275 error ("redefinition of `struct %s'", IDENTIFIER_POINTER (name
));
5280 /* Otherwise create a forward-reference just so the tag is in scope. */
5282 ref
= make_node (code
);
5283 pushtag (name
, ref
);
5286 C_TYPE_BEING_DEFINED (ref
) = 1;
5287 TYPE_PACKED (ref
) = flag_pack_struct
;
5291 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
5292 of a structure component, returning a FIELD_DECL node.
5293 WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node.
5295 This is done during the parsing of the struct declaration.
5296 The FIELD_DECL nodes are chained together and the lot of them
5297 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5300 grokfield (tree declarator
, tree declspecs
, tree width
)
5304 if (declarator
== NULL_TREE
&& width
== NULL_TREE
)
5306 /* This is an unnamed decl.
5308 If we have something of the form "union { list } ;" then this
5309 is the anonymous union extension. Similarly for struct.
5311 If this is something of the form "struct foo;", then
5312 If MS extensions are enabled, this is handled as an
5314 Otherwise this is a forward declaration of a structure tag.
5316 If this is something of the form "foo;" and foo is a TYPE_DECL, then
5317 If MS extensions are enabled and foo names a structure, then
5318 again this is an anonymous struct.
5319 Otherwise this is an error.
5321 Oh what a horrid tangled web we weave. I wonder if MS consciously
5322 took this from Plan 9 or if it was an accident of implementation
5323 that took root before someone noticed the bug... */
5325 tree type
= TREE_VALUE (declspecs
);
5327 if (flag_ms_extensions
&& TREE_CODE (type
) == TYPE_DECL
)
5328 type
= TREE_TYPE (type
);
5329 if (TREE_CODE (type
) == RECORD_TYPE
|| TREE_CODE (type
) == UNION_TYPE
)
5331 if (flag_ms_extensions
)
5334 goto warn_unnamed_field
;
5335 else if (TYPE_NAME (type
) == NULL
)
5338 goto warn_unnamed_field
;
5343 warning ("declaration does not declare anything");
5348 value
= grokdeclarator (declarator
, declspecs
, FIELD
, false,
5349 width
? &width
: NULL
);
5351 finish_decl (value
, NULL_TREE
, NULL_TREE
);
5352 DECL_INITIAL (value
) = width
;
5357 /* Generate an error for any duplicate field names in FIELDLIST. Munge
5358 the list such that this does not present a problem later. */
5361 detect_field_duplicates (tree fieldlist
)
5366 /* First, see if there are more than "a few" fields.
5367 This is trivially true if there are zero or one fields. */
5370 x
= TREE_CHAIN (fieldlist
);
5376 } while (timeout
> 0 && x
);
5378 /* If there were "few" fields, avoid the overhead of allocating
5379 a hash table. Instead just do the nested traversal thing. */
5382 for (x
= TREE_CHAIN (fieldlist
); x
; x
= TREE_CHAIN (x
))
5385 for (y
= fieldlist
; y
!= x
; y
= TREE_CHAIN (y
))
5386 if (DECL_NAME (y
) == DECL_NAME (x
))
5388 error ("%Jduplicate member '%D'", x
, x
);
5389 DECL_NAME (x
) = NULL_TREE
;
5395 htab_t htab
= htab_create (37, htab_hash_pointer
, htab_eq_pointer
, NULL
);
5398 for (x
= fieldlist
; x
; x
= TREE_CHAIN (x
))
5399 if ((y
= DECL_NAME (x
)) != 0)
5401 slot
= htab_find_slot (htab
, y
, INSERT
);
5404 error ("%Jduplicate member '%D'", x
, x
);
5405 DECL_NAME (x
) = NULL_TREE
;
5414 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5415 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5416 ATTRIBUTES are attributes to be applied to the structure. */
5419 finish_struct (tree t
, tree fieldlist
, tree attributes
)
5422 bool toplevel
= file_scope
== current_scope
;
5423 int saw_named_field
;
5425 /* If this type was previously laid out as a forward reference,
5426 make sure we lay it out again. */
5430 decl_attributes (&t
, attributes
, (int) ATTR_FLAG_TYPE_IN_PLACE
);
5434 for (x
= fieldlist
; x
; x
= TREE_CHAIN (x
))
5435 if (DECL_NAME (x
) != 0)
5439 pedwarn ("%s has no %s",
5440 TREE_CODE (t
) == UNION_TYPE
? _("union") : _("struct"),
5441 fieldlist
? _("named members") : _("members"));
5444 /* Install struct as DECL_CONTEXT of each field decl.
5445 Also process specified field sizes, found in the DECL_INITIAL,
5446 storing 0 there after the type has been changed to precision equal
5447 to its width, rather than the precision of the specified standard
5448 type. (Correct layout requires the original type to have been preserved
5451 saw_named_field
= 0;
5452 for (x
= fieldlist
; x
; x
= TREE_CHAIN (x
))
5454 DECL_CONTEXT (x
) = t
;
5455 DECL_PACKED (x
) |= TYPE_PACKED (t
);
5457 /* If any field is const, the structure type is pseudo-const. */
5458 if (TREE_READONLY (x
))
5459 C_TYPE_FIELDS_READONLY (t
) = 1;
5462 /* A field that is pseudo-const makes the structure likewise. */
5463 tree t1
= TREE_TYPE (x
);
5464 while (TREE_CODE (t1
) == ARRAY_TYPE
)
5465 t1
= TREE_TYPE (t1
);
5466 if ((TREE_CODE (t1
) == RECORD_TYPE
|| TREE_CODE (t1
) == UNION_TYPE
)
5467 && C_TYPE_FIELDS_READONLY (t1
))
5468 C_TYPE_FIELDS_READONLY (t
) = 1;
5471 /* Any field that is volatile means variables of this type must be
5472 treated in some ways as volatile. */
5473 if (TREE_THIS_VOLATILE (x
))
5474 C_TYPE_FIELDS_VOLATILE (t
) = 1;
5476 /* Any field of nominal variable size implies structure is too. */
5477 if (C_DECL_VARIABLE_SIZE (x
))
5478 C_TYPE_VARIABLE_SIZE (t
) = 1;
5480 /* Detect invalid nested redefinition. */
5481 if (TREE_TYPE (x
) == t
)
5482 error ("nested redefinition of `%s'",
5483 IDENTIFIER_POINTER (TYPE_NAME (t
)));
5485 if (DECL_INITIAL (x
))
5487 unsigned HOST_WIDE_INT width
= tree_low_cst (DECL_INITIAL (x
), 1);
5488 DECL_SIZE (x
) = bitsize_int (width
);
5489 DECL_BIT_FIELD (x
) = 1;
5490 SET_DECL_C_BIT_FIELD (x
);
5493 /* Detect flexible array member in an invalid context. */
5494 if (TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
5495 && TYPE_SIZE (TREE_TYPE (x
)) == NULL_TREE
5496 && TYPE_DOMAIN (TREE_TYPE (x
)) != NULL_TREE
5497 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x
))) == NULL_TREE
)
5499 if (TREE_CODE (t
) == UNION_TYPE
)
5501 error ("%Jflexible array member in union", x
);
5502 TREE_TYPE (x
) = error_mark_node
;
5504 else if (TREE_CHAIN (x
) != NULL_TREE
)
5506 error ("%Jflexible array member not at end of struct", x
);
5507 TREE_TYPE (x
) = error_mark_node
;
5509 else if (! saw_named_field
)
5511 error ("%Jflexible array member in otherwise empty struct", x
);
5512 TREE_TYPE (x
) = error_mark_node
;
5516 if (pedantic
&& !in_system_header
&& TREE_CODE (t
) == RECORD_TYPE
5517 && flexible_array_type_p (TREE_TYPE (x
)))
5518 pedwarn ("%Jinvalid use of structure with flexible array member", x
);
5521 saw_named_field
= 1;
5524 detect_field_duplicates (fieldlist
);
5526 /* Now we have the nearly final fieldlist. Record it,
5527 then lay out the structure or union (including the fields). */
5529 TYPE_FIELDS (t
) = fieldlist
;
5533 /* Give bit-fields their proper types. */
5535 tree
*fieldlistp
= &fieldlist
;
5537 if (TREE_CODE (*fieldlistp
) == FIELD_DECL
&& DECL_INITIAL (*fieldlistp
)
5538 && TREE_TYPE (*fieldlistp
) != error_mark_node
)
5540 unsigned HOST_WIDE_INT width
5541 = tree_low_cst (DECL_INITIAL (*fieldlistp
), 1);
5542 tree type
= TREE_TYPE (*fieldlistp
);
5543 if (width
!= TYPE_PRECISION (type
))
5544 TREE_TYPE (*fieldlistp
)
5545 = build_nonstandard_integer_type (width
, TYPE_UNSIGNED (type
));
5546 DECL_INITIAL (*fieldlistp
) = 0;
5549 fieldlistp
= &TREE_CHAIN (*fieldlistp
);
5552 /* Now we have the truly final field list.
5553 Store it in this type and in the variants. */
5555 TYPE_FIELDS (t
) = fieldlist
;
5557 /* If there are lots of fields, sort so we can look through them fast.
5558 We arbitrarily consider 16 or more elts to be "a lot". */
5563 for (x
= fieldlist
; x
; x
= TREE_CHAIN (x
))
5565 if (len
> 15 || DECL_NAME (x
) == NULL
)
5573 struct lang_type
*space
;
5574 struct sorted_fields_type
*space2
;
5576 len
+= list_length (x
);
5578 /* Use the same allocation policy here that make_node uses, to
5579 ensure that this lives as long as the rest of the struct decl.
5580 All decls in an inline function need to be saved. */
5582 space
= GGC_CNEW (struct lang_type
);
5583 space2
= GGC_NEWVAR (struct sorted_fields_type
,
5584 sizeof (struct sorted_fields_type
) + len
* sizeof (tree
));
5588 field_array
= &space2
->elts
[0];
5589 for (x
= fieldlist
; x
; x
= TREE_CHAIN (x
))
5591 field_array
[len
++] = x
;
5593 /* If there is anonymous struct or union, break out of the loop. */
5594 if (DECL_NAME (x
) == NULL
)
5597 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
5600 TYPE_LANG_SPECIFIC (t
) = space
;
5601 TYPE_LANG_SPECIFIC (t
)->s
->len
= len
;
5602 field_array
= TYPE_LANG_SPECIFIC (t
)->s
->elts
;
5603 qsort (field_array
, len
, sizeof (tree
), field_decl_cmp
);
5608 for (x
= TYPE_MAIN_VARIANT (t
); x
; x
= TYPE_NEXT_VARIANT (x
))
5610 TYPE_FIELDS (x
) = TYPE_FIELDS (t
);
5611 TYPE_LANG_SPECIFIC (x
) = TYPE_LANG_SPECIFIC (t
);
5612 TYPE_ALIGN (x
) = TYPE_ALIGN (t
);
5613 TYPE_USER_ALIGN (x
) = TYPE_USER_ALIGN (t
);
5616 /* If this was supposed to be a transparent union, but we can't
5617 make it one, warn and turn off the flag. */
5618 if (TREE_CODE (t
) == UNION_TYPE
5619 && TYPE_TRANSPARENT_UNION (t
)
5620 && TYPE_MODE (t
) != DECL_MODE (TYPE_FIELDS (t
)))
5622 TYPE_TRANSPARENT_UNION (t
) = 0;
5623 warning ("union cannot be made transparent");
5626 /* If this structure or union completes the type of any previous
5627 variable declaration, lay it out and output its rtl. */
5628 for (x
= C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t
));
5632 tree decl
= TREE_VALUE (x
);
5633 if (TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
)
5634 layout_array_type (TREE_TYPE (decl
));
5635 if (TREE_CODE (decl
) != TYPE_DECL
)
5637 layout_decl (decl
, 0);
5638 if (c_dialect_objc ())
5639 objc_check_decl (decl
);
5640 rest_of_decl_compilation (decl
, toplevel
, 0);
5645 C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t
)) = 0;
5647 /* Finish debugging output for this type. */
5648 rest_of_type_compilation (t
, toplevel
);
5653 /* Lay out the type T, and its element type, and so on. */
5656 layout_array_type (tree t
)
5658 if (TREE_CODE (TREE_TYPE (t
)) == ARRAY_TYPE
)
5659 layout_array_type (TREE_TYPE (t
));
5663 /* Begin compiling the definition of an enumeration type.
5664 NAME is its name (or null if anonymous).
5665 Returns the type object, as yet incomplete.
5666 Also records info about it so that build_enumerator
5667 may be used to declare the individual values as they are read. */
5670 start_enum (tree name
)
5674 /* If this is the real definition for a previous forward reference,
5675 fill in the contents in the same object that used to be the
5676 forward reference. */
5679 enumtype
= lookup_tag (ENUMERAL_TYPE
, name
, 1);
5681 if (enumtype
== 0 || TREE_CODE (enumtype
) != ENUMERAL_TYPE
)
5683 enumtype
= make_node (ENUMERAL_TYPE
);
5684 pushtag (name
, enumtype
);
5687 C_TYPE_BEING_DEFINED (enumtype
) = 1;
5689 if (TYPE_VALUES (enumtype
) != 0)
5691 /* This enum is a named one that has been declared already. */
5692 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name
));
5694 /* Completely replace its old definition.
5695 The old enumerators remain defined, however. */
5696 TYPE_VALUES (enumtype
) = 0;
5699 enum_next_value
= integer_zero_node
;
5702 if (flag_short_enums
)
5703 TYPE_PACKED (enumtype
) = 1;
5708 /* After processing and defining all the values of an enumeration type,
5709 install their decls in the enumeration type and finish it off.
5710 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5711 and ATTRIBUTES are the specified attributes.
5712 Returns ENUMTYPE. */
5715 finish_enum (tree enumtype
, tree values
, tree attributes
)
5718 tree minnode
= 0, maxnode
= 0;
5719 int precision
, unsign
;
5720 bool toplevel
= (file_scope
== current_scope
);
5721 struct lang_type
*lt
;
5723 decl_attributes (&enumtype
, attributes
, (int) ATTR_FLAG_TYPE_IN_PLACE
);
5725 /* Calculate the maximum value of any enumerator in this type. */
5727 if (values
== error_mark_node
)
5728 minnode
= maxnode
= integer_zero_node
;
5731 minnode
= maxnode
= TREE_VALUE (values
);
5732 for (pair
= TREE_CHAIN (values
); pair
; pair
= TREE_CHAIN (pair
))
5734 tree value
= TREE_VALUE (pair
);
5735 if (tree_int_cst_lt (maxnode
, value
))
5737 if (tree_int_cst_lt (value
, minnode
))
5742 /* Construct the final type of this enumeration. It is the same
5743 as one of the integral types - the narrowest one that fits, except
5744 that normally we only go as narrow as int - and signed iff any of
5745 the values are negative. */
5746 unsign
= (tree_int_cst_sgn (minnode
) >= 0);
5747 precision
= MAX (min_precision (minnode
, unsign
),
5748 min_precision (maxnode
, unsign
));
5750 if (TYPE_PACKED (enumtype
) || precision
> TYPE_PRECISION (integer_type_node
))
5752 tem
= c_common_type_for_size (precision
, unsign
);
5755 warning ("enumeration values exceed range of largest integer");
5756 tem
= long_long_integer_type_node
;
5760 tem
= unsign
? unsigned_type_node
: integer_type_node
;
5762 TYPE_MIN_VALUE (enumtype
) = TYPE_MIN_VALUE (tem
);
5763 TYPE_MAX_VALUE (enumtype
) = TYPE_MAX_VALUE (tem
);
5764 TYPE_UNSIGNED (enumtype
) = TYPE_UNSIGNED (tem
);
5765 TYPE_SIZE (enumtype
) = 0;
5767 /* If the precision of the type was specific with an attribute and it
5768 was too small, give an error. Otherwise, use it. */
5769 if (TYPE_PRECISION (enumtype
))
5771 if (precision
> TYPE_PRECISION (enumtype
))
5772 error ("specified mode too small for enumeral values");
5775 TYPE_PRECISION (enumtype
) = TYPE_PRECISION (tem
);
5777 layout_type (enumtype
);
5779 if (values
!= error_mark_node
)
5781 /* Change the type of the enumerators to be the enum type. We
5782 need to do this irrespective of the size of the enum, for
5783 proper type checking. Replace the DECL_INITIALs of the
5784 enumerators, and the value slots of the list, with copies
5785 that have the enum type; they cannot be modified in place
5786 because they may be shared (e.g. integer_zero_node) Finally,
5787 change the purpose slots to point to the names of the decls. */
5788 for (pair
= values
; pair
; pair
= TREE_CHAIN (pair
))
5790 tree enu
= TREE_PURPOSE (pair
);
5791 tree ini
= DECL_INITIAL (enu
);
5793 TREE_TYPE (enu
) = enumtype
;
5795 /* The ISO C Standard mandates enumerators to have type int,
5796 even though the underlying type of an enum type is
5797 unspecified. Here we convert any enumerators that fit in
5798 an int to type int, to avoid promotions to unsigned types
5799 when comparing integers with enumerators that fit in the
5800 int range. When -pedantic is given, build_enumerator()
5801 would have already taken care of those that don't fit. */
5802 if (int_fits_type_p (ini
, integer_type_node
))
5803 tem
= integer_type_node
;
5806 ini
= convert (tem
, ini
);
5808 DECL_INITIAL (enu
) = ini
;
5809 TREE_PURPOSE (pair
) = DECL_NAME (enu
);
5810 TREE_VALUE (pair
) = ini
;
5813 TYPE_VALUES (enumtype
) = values
;
5816 /* Record the min/max values so that we can warn about bit-field
5817 enumerations that are too small for the values. */
5818 lt
= GGC_CNEW (struct lang_type
);
5819 lt
->enum_min
= minnode
;
5820 lt
->enum_max
= maxnode
;
5821 TYPE_LANG_SPECIFIC (enumtype
) = lt
;
5823 /* Fix up all variant types of this enum type. */
5824 for (tem
= TYPE_MAIN_VARIANT (enumtype
); tem
; tem
= TYPE_NEXT_VARIANT (tem
))
5826 if (tem
== enumtype
)
5828 TYPE_VALUES (tem
) = TYPE_VALUES (enumtype
);
5829 TYPE_MIN_VALUE (tem
) = TYPE_MIN_VALUE (enumtype
);
5830 TYPE_MAX_VALUE (tem
) = TYPE_MAX_VALUE (enumtype
);
5831 TYPE_SIZE (tem
) = TYPE_SIZE (enumtype
);
5832 TYPE_SIZE_UNIT (tem
) = TYPE_SIZE_UNIT (enumtype
);
5833 TYPE_MODE (tem
) = TYPE_MODE (enumtype
);
5834 TYPE_PRECISION (tem
) = TYPE_PRECISION (enumtype
);
5835 TYPE_ALIGN (tem
) = TYPE_ALIGN (enumtype
);
5836 TYPE_USER_ALIGN (tem
) = TYPE_USER_ALIGN (enumtype
);
5837 TYPE_UNSIGNED (tem
) = TYPE_UNSIGNED (enumtype
);
5838 TYPE_LANG_SPECIFIC (tem
) = TYPE_LANG_SPECIFIC (enumtype
);
5841 /* Finish debugging output for this type. */
5842 rest_of_type_compilation (enumtype
, toplevel
);
5847 /* Build and install a CONST_DECL for one value of the
5848 current enumeration type (one that was begun with start_enum).
5849 Return a tree-list containing the CONST_DECL and its value.
5850 Assignment of sequential values by default is handled here. */
5853 build_enumerator (tree name
, tree value
)
5857 /* Validate and default VALUE. */
5859 /* Remove no-op casts from the value. */
5861 STRIP_TYPE_NOPS (value
);
5865 /* Don't issue more errors for error_mark_node (i.e. an
5866 undeclared identifier) - just ignore the value expression. */
5867 if (value
== error_mark_node
)
5869 else if (TREE_CODE (value
) != INTEGER_CST
)
5871 error ("enumerator value for '%E' is not an integer constant", name
);
5876 value
= default_conversion (value
);
5877 constant_expression_warning (value
);
5881 /* Default based on previous value. */
5882 /* It should no longer be possible to have NON_LVALUE_EXPR
5886 value
= enum_next_value
;
5888 error ("overflow in enumeration values");
5891 if (pedantic
&& ! int_fits_type_p (value
, integer_type_node
))
5893 pedwarn ("ISO C restricts enumerator values to range of `int'");
5894 /* XXX This causes -pedantic to change the meaning of the program.
5895 Remove? -zw 2004-03-15 */
5896 value
= convert (integer_type_node
, value
);
5899 /* Set basis for default for next value. */
5900 enum_next_value
= build_binary_op (PLUS_EXPR
, value
, integer_one_node
, 0);
5901 enum_overflow
= tree_int_cst_lt (enum_next_value
, value
);
5903 /* Now create a declaration for the enum value name. */
5905 type
= TREE_TYPE (value
);
5906 type
= c_common_type_for_size (MAX (TYPE_PRECISION (type
),
5907 TYPE_PRECISION (integer_type_node
)),
5908 (TYPE_PRECISION (type
)
5909 >= TYPE_PRECISION (integer_type_node
)
5910 && TYPE_UNSIGNED (type
)));
5912 decl
= build_decl (CONST_DECL
, name
, type
);
5913 DECL_INITIAL (decl
) = convert (type
, value
);
5916 return tree_cons (decl
, value
, NULL_TREE
);
5920 /* Create the FUNCTION_DECL for a function definition.
5921 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
5922 the declaration; they describe the function's name and the type it returns,
5923 but twisted together in a fashion that parallels the syntax of C.
5925 This function creates a binding context for the function body
5926 as well as setting up the FUNCTION_DECL in current_function_decl.
5928 Returns 1 on success. If the DECLARATOR is not suitable for a function
5929 (it defines a datum instead), we return 0, which tells
5930 yyparse to report a parse error. */
5933 start_function (tree declspecs
, tree declarator
, tree attributes
)
5935 tree decl1
, old_decl
;
5936 tree restype
, resdecl
;
5938 current_function_returns_value
= 0; /* Assume, until we see it does. */
5939 current_function_returns_null
= 0;
5940 current_function_returns_abnormally
= 0;
5941 warn_about_return_type
= 0;
5942 current_extern_inline
= 0;
5943 c_switch_stack
= NULL
;
5945 /* Indicate no valid break/continue context by setting these variables
5946 to some non-null, non-label value. We'll notice and emit the proper
5947 error message in c_finish_bc_stmt. */
5948 c_break_label
= c_cont_label
= size_zero_node
;
5950 decl1
= grokdeclarator (declarator
, declspecs
, FUNCDEF
, true, NULL
);
5952 /* If the declarator is not suitable for a function definition,
5953 cause a syntax error. */
5957 decl_attributes (&decl1
, attributes
, 0);
5959 if (DECL_DECLARED_INLINE_P (decl1
)
5960 && DECL_UNINLINABLE (decl1
)
5961 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1
)))
5962 warning ("%Jinline function '%D' given attribute noinline", decl1
, decl1
);
5964 announce_function (decl1
);
5966 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1
))))
5968 error ("return type is an incomplete type");
5969 /* Make it return void instead. */
5971 = build_function_type (void_type_node
,
5972 TYPE_ARG_TYPES (TREE_TYPE (decl1
)));
5975 if (warn_about_return_type
)
5976 pedwarn_c99 ("return type defaults to `int'");
5978 /* Make the init_value nonzero so pushdecl knows this is not tentative.
5979 error_mark_node is replaced below (in pop_scope) with the BLOCK. */
5980 DECL_INITIAL (decl1
) = error_mark_node
;
5982 /* If this definition isn't a prototype and we had a prototype declaration
5983 before, copy the arg type info from that prototype.
5984 But not if what we had before was a builtin function. */
5985 old_decl
= lookup_name_in_scope (DECL_NAME (decl1
), current_scope
);
5986 if (old_decl
!= 0 && TREE_CODE (TREE_TYPE (old_decl
)) == FUNCTION_TYPE
5987 && !DECL_BUILT_IN (old_decl
)
5988 && comptypes (TREE_TYPE (TREE_TYPE (decl1
)),
5989 TREE_TYPE (TREE_TYPE (old_decl
)))
5990 && TYPE_ARG_TYPES (TREE_TYPE (decl1
)) == 0)
5992 TREE_TYPE (decl1
) = composite_type (TREE_TYPE (old_decl
),
5994 current_function_prototype_locus
= DECL_SOURCE_LOCATION (old_decl
);
5997 /* Optionally warn of old-fashioned def with no previous prototype. */
5998 if (warn_strict_prototypes
5999 && TYPE_ARG_TYPES (TREE_TYPE (decl1
)) == 0
6000 && C_DECL_ISNT_PROTOTYPE (old_decl
))
6001 warning ("function declaration isn't a prototype");
6002 /* Optionally warn of any global def with no previous prototype. */
6003 else if (warn_missing_prototypes
6004 && TREE_PUBLIC (decl1
)
6005 && ! MAIN_NAME_P (DECL_NAME (decl1
))
6006 && C_DECL_ISNT_PROTOTYPE (old_decl
))
6007 warning ("%Jno previous prototype for '%D'", decl1
, decl1
);
6008 /* Optionally warn of any def with no previous prototype
6009 if the function has already been used. */
6010 else if (warn_missing_prototypes
6011 && old_decl
!= 0 && TREE_USED (old_decl
)
6012 && TYPE_ARG_TYPES (TREE_TYPE (old_decl
)) == 0)
6013 warning ("%J'%D' was used with no prototype before its definition",
6015 /* Optionally warn of any global def with no previous declaration. */
6016 else if (warn_missing_declarations
6017 && TREE_PUBLIC (decl1
)
6019 && ! MAIN_NAME_P (DECL_NAME (decl1
)))
6020 warning ("%Jno previous declaration for '%D'", decl1
, decl1
);
6021 /* Optionally warn of any def with no previous declaration
6022 if the function has already been used. */
6023 else if (warn_missing_declarations
6024 && old_decl
!= 0 && TREE_USED (old_decl
)
6025 && C_DECL_IMPLICIT (old_decl
))
6026 warning ("%J`%D' was used with no declaration before its definition",
6029 /* This is a definition, not a reference.
6030 So normally clear DECL_EXTERNAL.
6031 However, `extern inline' acts like a declaration
6032 except for defining how to inline. So set DECL_EXTERNAL in that case. */
6033 DECL_EXTERNAL (decl1
) = current_extern_inline
;
6035 /* This function exists in static storage.
6036 (This does not mean `static' in the C sense!) */
6037 TREE_STATIC (decl1
) = 1;
6039 /* A nested function is not global. */
6040 if (current_function_decl
!= 0)
6041 TREE_PUBLIC (decl1
) = 0;
6043 /* This is the earliest point at which we might know the assembler
6044 name of the function. Thus, if it's set before this, die horribly. */
6045 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl1
));
6047 /* If #pragma weak was used, mark the decl weak now. */
6048 if (current_scope
== file_scope
)
6049 maybe_apply_pragma_weak (decl1
);
6051 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
6052 if (warn_main
> 0 && MAIN_NAME_P (DECL_NAME (decl1
)))
6057 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1
)))
6058 != integer_type_node
)
6059 pedwarn ("%Jreturn type of '%D' is not `int'", decl1
, decl1
);
6061 for (args
= TYPE_ARG_TYPES (TREE_TYPE (decl1
)); args
;
6062 args
= TREE_CHAIN (args
))
6064 tree type
= args
? TREE_VALUE (args
) : 0;
6066 if (type
== void_type_node
)
6073 if (TYPE_MAIN_VARIANT (type
) != integer_type_node
)
6074 pedwarn ("%Jfirst argument of '%D' should be `int'",
6079 if (TREE_CODE (type
) != POINTER_TYPE
6080 || TREE_CODE (TREE_TYPE (type
)) != POINTER_TYPE
6081 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type
)))
6083 pedwarn ("%Jsecond argument of '%D' should be 'char **'",
6088 if (TREE_CODE (type
) != POINTER_TYPE
6089 || TREE_CODE (TREE_TYPE (type
)) != POINTER_TYPE
6090 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type
)))
6092 pedwarn ("%Jthird argument of '%D' should probably be "
6093 "'char **'", decl1
, decl1
);
6098 /* It is intentional that this message does not mention the third
6099 argument because it's only mentioned in an appendix of the
6101 if (argct
> 0 && (argct
< 2 || argct
> 3))
6102 pedwarn ("%J'%D' takes only zero or two arguments", decl1
, decl1
);
6104 if (! TREE_PUBLIC (decl1
))
6105 pedwarn ("%J'%D' is normally a non-static function", decl1
, decl1
);
6108 /* Record the decl so that the function name is defined.
6109 If we already have a decl for this name, and it is a FUNCTION_DECL,
6110 use the old decl. */
6112 current_function_decl
= pushdecl (decl1
);
6115 declare_parm_level ();
6117 restype
= TREE_TYPE (TREE_TYPE (current_function_decl
));
6118 /* Promote the value to int before returning it. */
6119 if (c_promoting_integer_type_p (restype
))
6121 /* It retains unsignedness if not really getting wider. */
6122 if (TYPE_UNSIGNED (restype
)
6123 && (TYPE_PRECISION (restype
)
6124 == TYPE_PRECISION (integer_type_node
)))
6125 restype
= unsigned_type_node
;
6127 restype
= integer_type_node
;
6130 resdecl
= build_decl (RESULT_DECL
, NULL_TREE
, restype
);
6131 DECL_ARTIFICIAL (resdecl
) = 1;
6132 DECL_IGNORED_P (resdecl
) = 1;
6133 DECL_RESULT (current_function_decl
) = resdecl
;
6135 start_fname_decls ();
6140 /* Subroutine of store_parm_decls which handles new-style function
6141 definitions (prototype format). The parms already have decls, so we
6142 need only record them as in effect and complain if any redundant
6143 old-style parm decls were written. */
6145 store_parm_decls_newstyle (tree fndecl
, tree arg_info
)
6148 tree parms
= ARG_INFO_PARMS (arg_info
);
6149 tree tags
= ARG_INFO_TAGS (arg_info
);
6150 tree others
= ARG_INFO_OTHERS (arg_info
);
6152 if (current_scope
->bindings
)
6154 error ("%Jold-style parameter declarations in prototyped "
6155 "function definition", fndecl
);
6157 /* Get rid of the old-style declarations. */
6161 /* Don't issue this warning for nested functions, and don't issue this
6162 warning if we got here because ARG_INFO_TYPES was error_mark_node
6163 (this happens when a function definition has just an ellipsis in
6164 its parameter list). */
6165 else if (warn_traditional
&& !in_system_header
&& !current_function_scope
6166 && ARG_INFO_TYPES (arg_info
) != error_mark_node
)
6167 warning ("%Jtraditional C rejects ISO C style function definitions",
6170 /* Now make all the parameter declarations visible in the function body.
6171 We can bypass most of the grunt work of pushdecl. */
6172 for (decl
= parms
; decl
; decl
= TREE_CHAIN (decl
))
6174 DECL_CONTEXT (decl
) = current_function_decl
;
6175 if (DECL_NAME (decl
))
6176 bind (DECL_NAME (decl
), decl
, current_scope
,
6177 /*invisible=*/false, /*nested=*/false);
6179 error ("%Jparameter name omitted", decl
);
6182 /* Record the parameter list in the function declaration. */
6183 DECL_ARGUMENTS (fndecl
) = parms
;
6185 /* Now make all the ancillary declarations visible, likewise. */
6186 for (decl
= others
; decl
; decl
= TREE_CHAIN (decl
))
6188 DECL_CONTEXT (decl
) = current_function_decl
;
6189 if (DECL_NAME (decl
))
6190 bind (DECL_NAME (decl
), decl
, current_scope
,
6191 /*invisible=*/false, /*nested=*/false);
6194 /* And all the tag declarations. */
6195 for (decl
= tags
; decl
; decl
= TREE_CHAIN (decl
))
6196 if (TREE_PURPOSE (decl
))
6197 bind (TREE_PURPOSE (decl
), TREE_VALUE (decl
), current_scope
,
6198 /*invisible=*/false, /*nested=*/false);
6201 /* Subroutine of store_parm_decls which handles old-style function
6202 definitions (separate parameter list and declarations). */
6205 store_parm_decls_oldstyle (tree fndecl
, tree arg_info
)
6207 struct c_binding
*b
;
6208 tree parm
, decl
, last
;
6209 tree parmids
= ARG_INFO_PARMS (arg_info
);
6211 /* We use DECL_WEAK as a flag to show which parameters have been
6212 seen already, since it is not used on PARM_DECL. */
6213 #ifdef ENABLE_CHECKING
6214 for (b
= current_scope
->bindings
; b
; b
= b
->prev
)
6215 gcc_assert (TREE_CODE (b
->decl
) != PARM_DECL
|| !DECL_WEAK (b
->decl
));
6218 if (warn_old_style_definition
&& !in_system_header
)
6219 warning ("%Jold-style function definition", fndecl
);
6221 /* Match each formal parameter name with its declaration. Save each
6222 decl in the appropriate TREE_PURPOSE slot of the parmids chain. */
6223 for (parm
= parmids
; parm
; parm
= TREE_CHAIN (parm
))
6225 if (TREE_VALUE (parm
) == 0)
6227 error ("%Jparameter name missing from parameter list", fndecl
);
6228 TREE_PURPOSE (parm
) = 0;
6232 b
= I_SYMBOL_BINDING (TREE_VALUE (parm
));
6233 if (b
&& B_IN_CURRENT_SCOPE (b
))
6236 /* If we got something other than a PARM_DECL it is an error. */
6237 if (TREE_CODE (decl
) != PARM_DECL
)
6238 error ("%J'%D' declared as a non-parameter", decl
, decl
);
6239 /* If the declaration is already marked, we have a duplicate
6240 name. Complain and ignore the duplicate. */
6241 else if (DECL_WEAK (decl
))
6243 error ("%Jmultiple parameters named '%D'", decl
, decl
);
6244 TREE_PURPOSE (parm
) = 0;
6247 /* If the declaration says "void", complain and turn it into
6249 else if (VOID_TYPE_P (TREE_TYPE (decl
)))
6251 error ("%Jparameter '%D' declared with void type", decl
, decl
);
6252 TREE_TYPE (decl
) = integer_type_node
;
6253 DECL_ARG_TYPE (decl
) = integer_type_node
;
6254 layout_decl (decl
, 0);
6257 /* If no declaration found, default to int. */
6260 decl
= build_decl (PARM_DECL
, TREE_VALUE (parm
), integer_type_node
);
6261 DECL_ARG_TYPE (decl
) = TREE_TYPE (decl
);
6262 DECL_SOURCE_LOCATION (decl
) = DECL_SOURCE_LOCATION (fndecl
);
6266 pedwarn ("%Jtype of '%D' defaults to 'int'", decl
, decl
);
6267 else if (extra_warnings
)
6268 warning ("%Jtype of '%D' defaults to 'int'", decl
, decl
);
6271 TREE_PURPOSE (parm
) = decl
;
6272 DECL_WEAK (decl
) = 1;
6275 /* Now examine the parms chain for incomplete declarations
6276 and declarations with no corresponding names. */
6278 for (b
= current_scope
->bindings
; b
; b
= b
->prev
)
6281 if (TREE_CODE (parm
) != PARM_DECL
)
6284 if (!COMPLETE_TYPE_P (TREE_TYPE (parm
)))
6286 error ("%Jparameter '%D' has incomplete type", parm
, parm
);
6287 TREE_TYPE (parm
) = error_mark_node
;
6290 if (! DECL_WEAK (parm
))
6292 error ("%Jdeclaration for parameter '%D' but no such parameter",
6295 /* Pretend the parameter was not missing.
6296 This gets us to a standard state and minimizes
6297 further error messages. */
6298 parmids
= chainon (parmids
, tree_cons (parm
, 0, 0));
6302 /* Chain the declarations together in the order of the list of
6303 names. Store that chain in the function decl, replacing the
6304 list of names. Update the current scope to match. */
6305 DECL_ARGUMENTS (fndecl
) = 0;
6307 for (parm
= parmids
; parm
; parm
= TREE_CHAIN (parm
))
6308 if (TREE_PURPOSE (parm
))
6310 if (parm
&& TREE_PURPOSE (parm
))
6312 last
= TREE_PURPOSE (parm
);
6313 DECL_ARGUMENTS (fndecl
) = last
;
6314 DECL_WEAK (last
) = 0;
6316 for (parm
= TREE_CHAIN (parm
); parm
; parm
= TREE_CHAIN (parm
))
6317 if (TREE_PURPOSE (parm
))
6319 TREE_CHAIN (last
) = TREE_PURPOSE (parm
);
6320 last
= TREE_PURPOSE (parm
);
6321 DECL_WEAK (last
) = 0;
6323 TREE_CHAIN (last
) = 0;
6326 /* If there was a previous prototype,
6327 set the DECL_ARG_TYPE of each argument according to
6328 the type previously specified, and report any mismatches. */
6330 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl
)))
6333 for (parm
= DECL_ARGUMENTS (fndecl
),
6334 type
= TYPE_ARG_TYPES (TREE_TYPE (fndecl
));
6335 parm
|| (type
&& (TYPE_MAIN_VARIANT (TREE_VALUE (type
))
6336 != void_type_node
));
6337 parm
= TREE_CHAIN (parm
), type
= TREE_CHAIN (type
))
6339 if (parm
== 0 || type
== 0
6340 || TYPE_MAIN_VARIANT (TREE_VALUE (type
)) == void_type_node
)
6342 error ("number of arguments doesn't match prototype");
6343 error ("%Hprototype declaration",
6344 ¤t_function_prototype_locus
);
6347 /* Type for passing arg must be consistent with that
6348 declared for the arg. ISO C says we take the unqualified
6349 type for parameters declared with qualified type. */
6350 if (! comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm
)),
6351 TYPE_MAIN_VARIANT (TREE_VALUE (type
))))
6353 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm
))
6354 == TYPE_MAIN_VARIANT (TREE_VALUE (type
)))
6356 /* Adjust argument to match prototype. E.g. a previous
6357 `int foo(float);' prototype causes
6358 `int foo(x) float x; {...}' to be treated like
6359 `int foo(float x) {...}'. This is particularly
6360 useful for argument types like uid_t. */
6361 DECL_ARG_TYPE (parm
) = TREE_TYPE (parm
);
6363 if (targetm
.calls
.promote_prototypes (TREE_TYPE (current_function_decl
))
6364 && INTEGRAL_TYPE_P (TREE_TYPE (parm
))
6365 && TYPE_PRECISION (TREE_TYPE (parm
))
6366 < TYPE_PRECISION (integer_type_node
))
6367 DECL_ARG_TYPE (parm
) = integer_type_node
;
6371 pedwarn ("promoted argument '%D' "
6372 "doesn't match prototype", parm
);
6373 pedwarn ("%Hprototype declaration",
6374 ¤t_function_prototype_locus
);
6379 error ("argument '%D' doesn't match prototype", parm
);
6380 error ("%Hprototype declaration",
6381 ¤t_function_prototype_locus
);
6385 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl
)) = 0;
6388 /* Otherwise, create a prototype that would match. */
6392 tree actual
= 0, last
= 0, type
;
6394 for (parm
= DECL_ARGUMENTS (fndecl
); parm
; parm
= TREE_CHAIN (parm
))
6396 type
= tree_cons (NULL_TREE
, DECL_ARG_TYPE (parm
), NULL_TREE
);
6398 TREE_CHAIN (last
) = type
;
6403 type
= tree_cons (NULL_TREE
, void_type_node
, NULL_TREE
);
6405 TREE_CHAIN (last
) = type
;
6409 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6410 of the type of this function, but we need to avoid having this
6411 affect the types of other similarly-typed functions, so we must
6412 first force the generation of an identical (but separate) type
6413 node for the relevant function type. The new node we create
6414 will be a variant of the main variant of the original function
6417 TREE_TYPE (fndecl
) = build_variant_type_copy (TREE_TYPE (fndecl
));
6419 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl
)) = actual
;
6423 /* Store parameter declarations passed in ARG_INFO into the current
6424 function declaration. */
6427 store_parm_decls_from (tree arg_info
)
6429 current_function_arg_info
= arg_info
;
6430 store_parm_decls ();
6433 /* Store the parameter declarations into the current function declaration.
6434 This is called after parsing the parameter declarations, before
6435 digesting the body of the function.
6437 For an old-style definition, construct a prototype out of the old-style
6438 parameter declarations and inject it into the function's type. */
6441 store_parm_decls (void)
6443 tree fndecl
= current_function_decl
;
6446 /* The argument information block for FNDECL. */
6447 tree arg_info
= current_function_arg_info
;
6448 current_function_arg_info
= 0;
6450 /* True if this definition is written with a prototype. Note:
6451 despite C99 6.7.5.3p14, we can *not* treat an empty argument
6452 list in a function definition as equivalent to (void) -- an
6453 empty argument list specifies the function has no parameters,
6454 but only (void) sets up a prototype for future calls. */
6455 proto
= ARG_INFO_TYPES (arg_info
) != 0;
6458 store_parm_decls_newstyle (fndecl
, arg_info
);
6460 store_parm_decls_oldstyle (fndecl
, arg_info
);
6462 /* The next call to push_scope will be a function body. */
6464 next_is_function_body
= true;
6466 /* Write a record describing this function definition to the prototypes
6467 file (if requested). */
6469 gen_aux_info_record (fndecl
, 1, 0, proto
);
6471 /* Initialize the RTL code for the function. */
6472 allocate_struct_function (fndecl
);
6474 /* Begin the statement tree for this function. */
6475 DECL_SAVED_TREE (fndecl
) = push_stmt_list ();
6477 /* ??? Insert the contents of the pending sizes list into the function
6478 to be evaluated. This just changes mis-behaviour until assign_parms
6479 phase ordering problems are resolved. */
6482 for (t
= nreverse (get_pending_sizes ()); t
; t
= TREE_CHAIN (t
))
6483 add_stmt (TREE_VALUE (t
));
6486 /* Even though we're inside a function body, we still don't want to
6487 call expand_expr to calculate the size of a variable-sized array.
6488 We haven't necessarily assigned RTL to all variables yet, so it's
6489 not safe to try to expand expressions involving them. */
6490 cfun
->x_dont_save_pending_sizes_p
= 1;
6493 /* Give FNDECL and all its nested functions to cgraph for compilation. */
6496 c_finalize (tree fndecl
)
6498 struct cgraph_node
*cgn
;
6500 /* Handle attribute((warn_unused_result)). Relies on gimple input. */
6501 c_warn_unused_result (&DECL_SAVED_TREE (fndecl
));
6503 /* ??? Objc emits functions after finalizing the compilation unit.
6504 This should be cleaned up later and this conditional removed. */
6505 if (cgraph_global_info_ready
)
6507 c_expand_body (fndecl
);
6511 /* Finalize all nested functions now. */
6512 cgn
= cgraph_node (fndecl
);
6513 for (cgn
= cgn
->nested
; cgn
; cgn
= cgn
->next_nested
)
6514 c_finalize (cgn
->decl
);
6516 cgraph_finalize_function (fndecl
, false);
6519 /* Finish up a function declaration and compile that function
6520 all the way to assembler language output. The free the storage
6521 for the function definition.
6523 This is called after parsing the body of the function definition. */
6526 finish_function (void)
6528 tree fndecl
= current_function_decl
;
6530 if (TREE_CODE (fndecl
) == FUNCTION_DECL
6531 && targetm
.calls
.promote_prototypes (TREE_TYPE (fndecl
)))
6533 tree args
= DECL_ARGUMENTS (fndecl
);
6534 for (; args
; args
= TREE_CHAIN (args
))
6536 tree type
= TREE_TYPE (args
);
6537 if (INTEGRAL_TYPE_P (type
)
6538 && TYPE_PRECISION (type
) < TYPE_PRECISION (integer_type_node
))
6539 DECL_ARG_TYPE (args
) = integer_type_node
;
6543 if (DECL_INITIAL (fndecl
) && DECL_INITIAL (fndecl
) != error_mark_node
)
6544 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl
)) = fndecl
;
6546 /* Must mark the RESULT_DECL as being in this function. */
6548 if (DECL_RESULT (fndecl
) && DECL_RESULT (fndecl
) != error_mark_node
)
6549 DECL_CONTEXT (DECL_RESULT (fndecl
)) = fndecl
;
6551 if (MAIN_NAME_P (DECL_NAME (fndecl
)) && flag_hosted
)
6553 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl
)))
6554 != integer_type_node
)
6556 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6557 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6559 pedwarn ("%Jreturn type of '%D' is not `int'", fndecl
, fndecl
);
6564 c_finish_return (integer_zero_node
);
6568 /* Tie off the statement tree for this function. */
6569 DECL_SAVED_TREE (fndecl
) = pop_stmt_list (DECL_SAVED_TREE (fndecl
));
6571 finish_fname_decls ();
6573 /* Complain if there's just no return statement. */
6574 if (warn_return_type
6575 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl
))) != VOID_TYPE
6576 && !current_function_returns_value
&& !current_function_returns_null
6577 /* Don't complain if we abort. */
6578 && !current_function_returns_abnormally
6579 /* Don't warn for main(). */
6580 && !MAIN_NAME_P (DECL_NAME (fndecl
))
6581 /* Or if they didn't actually specify a return type. */
6582 && !C_FUNCTION_IMPLICIT_INT (fndecl
)
6583 /* Normally, with -Wreturn-type, flow will complain. Unless we're an
6584 inline function, as we might never be compiled separately. */
6585 && DECL_INLINE (fndecl
))
6586 warning ("no return statement in function returning non-void");
6588 /* With just -Wextra, complain only if function returns both with
6589 and without a value. */
6591 && current_function_returns_value
6592 && current_function_returns_null
)
6593 warning ("this function may return with or without a value");
6595 /* Store the end of the function, so that we get good line number
6596 info for the epilogue. */
6597 cfun
->function_end_locus
= input_location
;
6599 /* If we don't have ctors/dtors sections, and this is a static
6600 constructor or destructor, it must be recorded now. */
6601 if (DECL_STATIC_CONSTRUCTOR (fndecl
)
6602 && !targetm
.have_ctors_dtors
)
6603 static_ctors
= tree_cons (NULL_TREE
, fndecl
, static_ctors
);
6604 if (DECL_STATIC_DESTRUCTOR (fndecl
)
6605 && !targetm
.have_ctors_dtors
)
6606 static_dtors
= tree_cons (NULL_TREE
, fndecl
, static_dtors
);
6608 /* Finalize the ELF visibility for the function. */
6609 c_determine_visibility (fndecl
);
6611 /* Genericize before inlining. Delay genericizing nested functions
6612 until their parent function is genericized. Since finalizing
6613 requires GENERIC, delay that as well. */
6615 if (DECL_INITIAL (fndecl
) && DECL_INITIAL (fndecl
) != error_mark_node
)
6617 if (!decl_function_context (fndecl
))
6619 c_genericize (fndecl
);
6620 lower_nested_functions (fndecl
);
6621 c_finalize (fndecl
);
6625 /* Register this function with cgraph just far enough to get it
6626 added to our parent's nested function list. Handy, since the
6627 C front end doesn't have such a list. */
6628 (void) cgraph_node (fndecl
);
6632 /* We're leaving the context of this function, so zap cfun.
6633 It's still in DECL_STRUCT_FUNCTION, and we'll restore it in
6634 tree_rest_of_compilation. */
6636 current_function_decl
= NULL
;
6639 /* Generate the RTL for the body of FNDECL. */
6642 c_expand_body (tree fndecl
)
6645 if (!DECL_INITIAL (fndecl
)
6646 || DECL_INITIAL (fndecl
) == error_mark_node
)
6649 tree_rest_of_compilation (fndecl
, false);
6651 if (DECL_STATIC_CONSTRUCTOR (fndecl
)
6652 && targetm
.have_ctors_dtors
)
6653 targetm
.asm_out
.constructor (XEXP (DECL_RTL (fndecl
), 0),
6654 DEFAULT_INIT_PRIORITY
);
6655 if (DECL_STATIC_DESTRUCTOR (fndecl
)
6656 && targetm
.have_ctors_dtors
)
6657 targetm
.asm_out
.destructor (XEXP (DECL_RTL (fndecl
), 0),
6658 DEFAULT_INIT_PRIORITY
);
6661 /* Check the declarations given in a for-loop for satisfying the C99
6664 check_for_loop_decls (void)
6666 struct c_binding
*b
;
6670 /* If we get here, declarations have been used in a for loop without
6671 the C99 for loop scope. This doesn't make much sense, so don't
6673 error ("'for' loop initial declaration used outside C99 mode");
6676 /* C99 subclause 6.8.5 paragraph 3:
6678 [#3] The declaration part of a for statement shall only
6679 declare identifiers for objects having storage class auto or
6682 It isn't clear whether, in this sentence, "identifiers" binds to
6683 "shall only declare" or to "objects" - that is, whether all identifiers
6684 declared must be identifiers for objects, or whether the restriction
6685 only applies to those that are. (A question on this in comp.std.c
6686 in November 2000 received no answer.) We implement the strictest
6687 interpretation, to avoid creating an extension which later causes
6690 for (b
= current_scope
->bindings
; b
; b
= b
->prev
)
6693 tree decl
= b
->decl
;
6698 switch (TREE_CODE (decl
))
6701 if (TREE_STATIC (decl
))
6702 error ("%Jdeclaration of static variable '%D' in 'for' loop "
6703 "initial declaration", decl
, decl
);
6704 else if (DECL_EXTERNAL (decl
))
6705 error ("%Jdeclaration of 'extern' variable '%D' in 'for' loop "
6706 "initial declaration", decl
, decl
);
6710 error ("'struct %E' declared in 'for' loop initial declaration", id
);
6713 error ("'union %E' declared in 'for' loop initial declaration", id
);
6716 error ("'enum %E' declared in 'for' loop initial declaration", id
);
6719 error ("%Jdeclaration of non-variable '%D' in 'for' loop "
6720 "initial declaration", decl
, decl
);
6725 /* Save and reinitialize the variables
6726 used during compilation of a C function. */
6729 c_push_function_context (struct function
*f
)
6731 struct language_function
*p
;
6732 p
= GGC_NEW (struct language_function
);
6735 p
->base
.x_stmt_tree
= c_stmt_tree
;
6736 p
->x_break_label
= c_break_label
;
6737 p
->x_cont_label
= c_cont_label
;
6738 p
->x_switch_stack
= c_switch_stack
;
6739 p
->arg_info
= current_function_arg_info
;
6740 p
->returns_value
= current_function_returns_value
;
6741 p
->returns_null
= current_function_returns_null
;
6742 p
->returns_abnormally
= current_function_returns_abnormally
;
6743 p
->warn_about_return_type
= warn_about_return_type
;
6744 p
->extern_inline
= current_extern_inline
;
6747 /* Restore the variables used during compilation of a C function. */
6750 c_pop_function_context (struct function
*f
)
6752 struct language_function
*p
= f
->language
;
6754 if (DECL_STRUCT_FUNCTION (current_function_decl
) == 0
6755 && DECL_SAVED_TREE (current_function_decl
) == NULL_TREE
)
6757 /* Stop pointing to the local nodes about to be freed. */
6758 /* But DECL_INITIAL must remain nonzero so we know this
6759 was an actual function definition. */
6760 DECL_INITIAL (current_function_decl
) = error_mark_node
;
6761 DECL_ARGUMENTS (current_function_decl
) = 0;
6764 c_stmt_tree
= p
->base
.x_stmt_tree
;
6765 c_break_label
= p
->x_break_label
;
6766 c_cont_label
= p
->x_cont_label
;
6767 c_switch_stack
= p
->x_switch_stack
;
6768 current_function_arg_info
= p
->arg_info
;
6769 current_function_returns_value
= p
->returns_value
;
6770 current_function_returns_null
= p
->returns_null
;
6771 current_function_returns_abnormally
= p
->returns_abnormally
;
6772 warn_about_return_type
= p
->warn_about_return_type
;
6773 current_extern_inline
= p
->extern_inline
;
6778 /* Copy the DECL_LANG_SPECIFIC data associated with DECL. */
6781 c_dup_lang_specific_decl (tree decl
)
6783 struct lang_decl
*ld
;
6785 if (!DECL_LANG_SPECIFIC (decl
))
6788 ld
= GGC_NEW (struct lang_decl
);
6789 memcpy (ld
, DECL_LANG_SPECIFIC (decl
), sizeof (struct lang_decl
));
6790 DECL_LANG_SPECIFIC (decl
) = ld
;
6793 /* The functions below are required for functionality of doing
6794 function at once processing in the C front end. Currently these
6795 functions are not called from anywhere in the C front end, but as
6796 these changes continue, that will change. */
6798 /* Returns nonzero if the current statement is a full expression,
6799 i.e. temporaries created during that statement should be destroyed
6800 at the end of the statement. */
6803 stmts_are_full_exprs_p (void)
6808 /* Returns the stmt_tree (if any) to which statements are currently
6809 being added. If there is no active statement-tree, NULL is
6813 current_stmt_tree (void)
6815 return &c_stmt_tree
;
6818 /* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
6822 anon_aggr_type_p (tree
ARG_UNUSED (node
))
6827 /* Dummy function in place of callback used by C++. */
6830 extract_interface_info (void)
6834 /* Return the global value of T as a symbol. */
6837 identifier_global_value (tree t
)
6839 struct c_binding
*b
;
6841 for (b
= I_SYMBOL_BINDING (t
); b
; b
= b
->shadowed
)
6842 if (B_IN_FILE_SCOPE (b
) || B_IN_EXTERNAL_SCOPE (b
))
6848 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
6849 otherwise the name is found in ridpointers from RID_INDEX. */
6852 record_builtin_type (enum rid rid_index
, const char *name
, tree type
)
6856 id
= ridpointers
[(int) rid_index
];
6858 id
= get_identifier (name
);
6859 decl
= build_decl (TYPE_DECL
, id
, type
);
6861 if (debug_hooks
->type_decl
)
6862 debug_hooks
->type_decl (decl
, false);
6865 /* Build the void_list_node (void_type_node having been created). */
6867 build_void_list_node (void)
6869 tree t
= build_tree_list (NULL_TREE
, void_type_node
);
6873 /* Return a structure for a parameter with the given SPECS, ATTRS and
6877 build_c_parm (tree specs
, tree attrs
, tree declarator
)
6879 return build_tree_list (build_tree_list (specs
, declarator
), attrs
);
6882 /* Return a declarator with nested attributes. TARGET is the inner
6883 declarator to which these attributes apply. ATTRS are the
6887 build_attrs_declarator (tree attrs
, tree target
)
6889 return tree_cons (attrs
, target
, NULL_TREE
);
6892 /* Return a declarator for a function with arguments specified by ARGS
6893 and return type specified by TARGET. */
6896 build_function_declarator (tree args
, tree target
)
6898 return build_nt (CALL_EXPR
, target
, args
, NULL_TREE
);
6901 /* Return something to represent absolute declarators containing a *.
6902 TARGET is the absolute declarator that the * contains.
6903 TYPE_QUALS_ATTRS is a list of modifiers such as const or volatile
6904 to apply to the pointer type, represented as identifiers, possible mixed
6907 We return an INDIRECT_REF whose "contents" are TARGET (inside a TREE_LIST,
6908 if attributes are present) and whose type is the modifier list. */
6911 make_pointer_declarator (tree type_quals_attrs
, tree target
)
6914 tree itarget
= target
;
6915 split_specs_attrs (type_quals_attrs
, &quals
, &attrs
);
6916 if (attrs
!= NULL_TREE
)
6917 itarget
= build_attrs_declarator (attrs
, target
);
6918 return build1 (INDIRECT_REF
, quals
, itarget
);
6921 /* Synthesize a function which calls all the global ctors or global
6922 dtors in this file. This is only used for targets which do not
6923 support .ctors/.dtors sections. FIXME: Migrate into cgraph. */
6925 build_cdtor (int method_type
, tree cdtors
)
6932 for (; cdtors
; cdtors
= TREE_CHAIN (cdtors
))
6933 append_to_statement_list (build_function_call (TREE_VALUE (cdtors
), 0),
6936 cgraph_build_static_cdtor (method_type
, body
, DEFAULT_INIT_PRIORITY
);
6939 /* Perform final processing on one file scope's declarations (or the
6940 external scope's declarations), GLOBALS. */
6942 c_write_global_declarations_1 (tree globals
)
6944 size_t len
= list_length (globals
);
6945 tree
*vec
= XNEWVEC (tree
, len
);
6949 /* Process the decls in the order they were written. */
6950 for (i
= 0, decl
= globals
; i
< len
; i
++, decl
= TREE_CHAIN (decl
))
6953 wrapup_global_declarations (vec
, len
);
6954 check_global_declarations (vec
, len
);
6960 c_write_global_declarations (void)
6964 /* We don't want to do this if generating a PCH. */
6968 /* Don't waste time on further processing if -fsyntax-only or we've
6969 encountered errors. */
6970 if (flag_syntax_only
|| errorcount
|| sorrycount
|| cpp_errors (parse_in
))
6973 /* Close the external scope. */
6974 ext_block
= pop_scope ();
6976 gcc_assert (!current_scope
);
6978 /* Process all file scopes in this compilation, and the external_scope,
6979 through wrapup_global_declarations and check_global_declarations. */
6980 for (t
= all_translation_units
; t
; t
= TREE_CHAIN (t
))
6981 c_write_global_declarations_1 (BLOCK_VARS (DECL_INITIAL (t
)));
6982 c_write_global_declarations_1 (BLOCK_VARS (ext_block
));
6984 /* Generate functions to call static constructors and destructors
6985 for targets that do not support .ctors/.dtors sections. These
6986 functions have magic names which are detected by collect2. */
6987 build_cdtor ('I', static_ctors
); static_ctors
= 0;
6988 build_cdtor ('D', static_dtors
); static_dtors
= 0;
6990 /* We're done parsing; proceed to optimize and emit assembly.
6991 FIXME: shouldn't be the front end's responsibility to call this. */
6994 /* Presently this has to happen after cgraph_optimize.
6995 FIXME: shouldn't be the front end's responsibility to call this. */
6997 mudflap_finish_file ();
7000 #include "gt-c-decl.h"