1 /* Process declarations and variables for C compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
3 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
5 This file is part of GCC.
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 2, or (at your option) any later
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING. If not, write to the Free
19 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
22 /* Process declarations and symbol lookup for C front end.
23 Also constructs types; the standard scalar types at initialization,
24 and structure, union, array and enum types when they are declared. */
26 /* ??? not all decl nodes are given the most useful possible
27 line numbers. For example, the CONST_DECLs for enum values. */
31 #include "coretypes.h"
35 #include "tree-inline.h"
52 #include "langhooks.h"
53 #include "tree-mudflap.h"
54 #include "tree-gimple.h"
55 #include "diagnostic.h"
56 #include "tree-dump.h"
61 #include "langhooks-def.h"
63 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
65 { NORMAL
, /* Ordinary declaration */
66 FUNCDEF
, /* Function definition */
67 PARM
, /* Declaration of parm before function body */
68 FIELD
, /* Declaration inside struct or union */
69 TYPENAME
}; /* Typename (inside cast or sizeof) */
72 /* Nonzero if we have seen an invalid cross reference
73 to a struct, union, or enum, but not yet printed the message. */
74 tree pending_invalid_xref
;
76 /* File and line to appear in the eventual error message. */
77 location_t pending_invalid_xref_location
;
79 /* True means we've initialized exception handling. */
80 bool c_eh_initialized_p
;
82 /* While defining an enum type, this is 1 plus the last enumerator
83 constant value. Note that will do not have to save this or `enum_overflow'
84 around nested function definition since such a definition could only
85 occur in an enum value expression and we don't use these variables in
88 static tree enum_next_value
;
90 /* Nonzero means that there was overflow computing enum_next_value. */
92 static int enum_overflow
;
94 /* The file and line that the prototype came from if this is an
95 old-style definition; used for diagnostics in
96 store_parm_decls_oldstyle. */
98 static location_t current_function_prototype_locus
;
100 /* The argument information structure for the function currently being
103 static struct c_arg_info
*current_function_arg_info
;
105 /* The obstack on which parser and related data structures, which are
106 not live beyond their top-level declaration or definition, are
108 struct obstack parser_obstack
;
110 /* The current statement tree. */
112 static GTY(()) struct stmt_tree_s c_stmt_tree
;
114 /* State saving variables. */
118 /* Linked list of TRANSLATION_UNIT_DECLS for the translation units
119 included in this invocation. Note that the current translation
120 unit is not included in this list. */
122 static GTY(()) tree all_translation_units
;
124 /* A list of decls to be made automatically visible in each file scope. */
125 static GTY(()) tree visible_builtins
;
127 /* Set to 0 at beginning of a function definition, set to 1 if
128 a return statement that specifies a return value is seen. */
130 int current_function_returns_value
;
132 /* Set to 0 at beginning of a function definition, set to 1 if
133 a return statement with no argument is seen. */
135 int current_function_returns_null
;
137 /* Set to 0 at beginning of a function definition, set to 1 if
138 a call to a noreturn function is seen. */
140 int current_function_returns_abnormally
;
142 /* Set to nonzero by `grokdeclarator' for a function
143 whose return type is defaulted, if warnings for this are desired. */
145 static int warn_about_return_type
;
147 /* Nonzero when starting a function declared `extern inline'. */
149 static int current_extern_inline
;
151 /* True means global_bindings_p should return false even if the scope stack
152 says we are in file scope. */
153 bool c_override_global_bindings_to_false
;
156 /* Each c_binding structure describes one binding of an identifier to
157 a decl. All the decls in a scope - irrespective of namespace - are
158 chained together by the ->prev field, which (as the name implies)
159 runs in reverse order. All the decls in a given namespace bound to
160 a given identifier are chained by the ->shadowed field, which runs
161 from inner to outer scopes.
163 The ->decl field usually points to a DECL node, but there are two
164 exceptions. In the namespace of type tags, the bound entity is a
165 RECORD_TYPE, UNION_TYPE, or ENUMERAL_TYPE node. If an undeclared
166 identifier is encountered, it is bound to error_mark_node to
167 suppress further errors about that identifier in the current
170 The ->type field stores the type of the declaration in this scope;
171 if NULL, the type is the type of the ->decl field. This is only of
172 relevance for objects with external or internal linkage which may
173 be redeclared in inner scopes, forming composite types that only
174 persist for the duration of those scopes. In the external scope,
175 this stores the composite of all the types declared for this
176 object, visible or not. The ->inner_comp field (used only at file
177 scope) stores whether an incomplete array type at file scope was
178 completed at an inner scope to an array size other than 1.
180 The depth field is copied from the scope structure that holds this
181 decl. It is used to preserve the proper ordering of the ->shadowed
182 field (see bind()) and also for a handful of special-case checks.
183 Finally, the invisible bit is true for a decl which should be
184 ignored for purposes of normal name lookup, and the nested bit is
185 true for a decl that's been bound a second time in an inner scope;
186 in all such cases, the binding in the outer scope will have its
187 invisible bit true. */
189 struct c_binding
GTY((chain_next ("%h.prev")))
191 tree decl
; /* the decl bound */
192 tree type
; /* the type in this scope */
193 tree id
; /* the identifier it's bound to */
194 struct c_binding
*prev
; /* the previous decl in this scope */
195 struct c_binding
*shadowed
; /* the innermost decl shadowed by this one */
196 unsigned int depth
: 28; /* depth of this scope */
197 BOOL_BITFIELD invisible
: 1; /* normal lookup should ignore this binding */
198 BOOL_BITFIELD nested
: 1; /* do not set DECL_CONTEXT when popping */
199 BOOL_BITFIELD inner_comp
: 1; /* incomplete array completed in inner scope */
202 #define B_IN_SCOPE(b1, b2) ((b1)->depth == (b2)->depth)
203 #define B_IN_CURRENT_SCOPE(b) ((b)->depth == current_scope->depth)
204 #define B_IN_FILE_SCOPE(b) ((b)->depth == 1 /*file_scope->depth*/)
205 #define B_IN_EXTERNAL_SCOPE(b) ((b)->depth == 0 /*external_scope->depth*/)
207 #define I_SYMBOL_BINDING(node) \
208 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->symbol_binding)
209 #define I_SYMBOL_DECL(node) \
210 (I_SYMBOL_BINDING(node) ? I_SYMBOL_BINDING(node)->decl : 0)
212 #define I_TAG_BINDING(node) \
213 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->tag_binding)
214 #define I_TAG_DECL(node) \
215 (I_TAG_BINDING(node) ? I_TAG_BINDING(node)->decl : 0)
217 #define I_LABEL_BINDING(node) \
218 (((struct lang_identifier *) IDENTIFIER_NODE_CHECK(node))->label_binding)
219 #define I_LABEL_DECL(node) \
220 (I_LABEL_BINDING(node) ? I_LABEL_BINDING(node)->decl : 0)
222 /* Each C symbol points to three linked lists of c_binding structures.
223 These describe the values of the identifier in the three different
224 namespaces defined by the language. */
226 struct lang_identifier
GTY(())
228 struct c_common_identifier common_id
;
229 struct c_binding
*symbol_binding
; /* vars, funcs, constants, typedefs */
230 struct c_binding
*tag_binding
; /* struct/union/enum tags */
231 struct c_binding
*label_binding
; /* labels */
234 /* Validate c-lang.c's assumptions. */
235 extern char C_SIZEOF_STRUCT_LANG_IDENTIFIER_isnt_accurate
236 [(sizeof(struct lang_identifier
) == C_SIZEOF_STRUCT_LANG_IDENTIFIER
) ? 1 : -1];
238 /* The resulting tree type. */
241 GTY((desc ("TREE_CODE (&%h.generic) == IDENTIFIER_NODE"),
242 chain_next ("TREE_CODE (&%h.generic) == INTEGER_TYPE ? (union lang_tree_node *) TYPE_NEXT_VARIANT (&%h.generic) : (union lang_tree_node *) TREE_CHAIN (&%h.generic)")))
244 union tree_node
GTY ((tag ("0"),
245 desc ("tree_node_structure (&%h)")))
247 struct lang_identifier
GTY ((tag ("1"))) identifier
;
250 /* Each c_scope structure describes the complete contents of one
251 scope. Four scopes are distinguished specially: the innermost or
252 current scope, the innermost function scope, the file scope (always
253 the second to outermost) and the outermost or external scope.
255 Most declarations are recorded in the current scope.
257 All normal label declarations are recorded in the innermost
258 function scope, as are bindings of undeclared identifiers to
259 error_mark_node. (GCC permits nested functions as an extension,
260 hence the 'innermost' qualifier.) Explicitly declared labels
261 (using the __label__ extension) appear in the current scope.
263 Being in the file scope (current_scope == file_scope) causes
264 special behavior in several places below. Also, under some
265 conditions the Objective-C front end records declarations in the
266 file scope even though that isn't the current scope.
268 All declarations with external linkage are recorded in the external
269 scope, even if they aren't visible there; this models the fact that
270 such declarations are visible to the entire program, and (with a
271 bit of cleverness, see pushdecl) allows diagnosis of some violations
272 of C99 6.2.2p7 and 6.2.7p2:
274 If, within the same translation unit, the same identifier appears
275 with both internal and external linkage, the behavior is
278 All declarations that refer to the same object or function shall
279 have compatible type; otherwise, the behavior is undefined.
281 Initially only the built-in declarations, which describe compiler
282 intrinsic functions plus a subset of the standard library, are in
285 The order of the blocks list matters, and it is frequently appended
286 to. To avoid having to walk all the way to the end of the list on
287 each insertion, or reverse the list later, we maintain a pointer to
288 the last list entry. (FIXME: It should be feasible to use a reversed
291 The bindings list is strictly in reverse order of declarations;
292 pop_scope relies on this. */
295 struct c_scope
GTY((chain_next ("%h.outer")))
297 /* The scope containing this one. */
298 struct c_scope
*outer
;
300 /* The next outermost function scope. */
301 struct c_scope
*outer_function
;
303 /* All bindings in this scope. */
304 struct c_binding
*bindings
;
306 /* For each scope (except the global one), a chain of BLOCK nodes
307 for all the scopes that were entered and exited one level down. */
311 /* The depth of this scope. Used to keep the ->shadowed chain of
312 bindings sorted innermost to outermost. */
313 unsigned int depth
: 28;
315 /* True if we are currently filling this scope with parameter
317 BOOL_BITFIELD parm_flag
: 1;
319 /* True if we already complained about forward parameter decls
320 in this scope. This prevents double warnings on
321 foo (int a; int b; ...) */
322 BOOL_BITFIELD warned_forward_parm_decls
: 1;
324 /* True if this is the outermost block scope of a function body.
325 This scope contains the parameters, the local variables declared
326 in the outermost block, and all the labels (except those in
327 nested functions, or declared at block scope with __label__). */
328 BOOL_BITFIELD function_body
: 1;
330 /* True means make a BLOCK for this scope no matter what. */
331 BOOL_BITFIELD keep
: 1;
334 /* The scope currently in effect. */
336 static GTY(()) struct c_scope
*current_scope
;
338 /* The innermost function scope. Ordinary (not explicitly declared)
339 labels, bindings to error_mark_node, and the lazily-created
340 bindings of __func__ and its friends get this scope. */
342 static GTY(()) struct c_scope
*current_function_scope
;
344 /* The C file scope. This is reset for each input translation unit. */
346 static GTY(()) struct c_scope
*file_scope
;
348 /* The outermost scope. This is used for all declarations with
349 external linkage, and only these, hence the name. */
351 static GTY(()) struct c_scope
*external_scope
;
353 /* A chain of c_scope structures awaiting reuse. */
355 static GTY((deletable
)) struct c_scope
*scope_freelist
;
357 /* A chain of c_binding structures awaiting reuse. */
359 static GTY((deletable
)) struct c_binding
*binding_freelist
;
361 /* Append VAR to LIST in scope SCOPE. */
362 #define SCOPE_LIST_APPEND(scope, list, decl) do { \
363 struct c_scope *s_ = (scope); \
365 if (s_->list##_last) \
366 TREE_CHAIN (s_->list##_last) = d_; \
369 s_->list##_last = d_; \
372 /* Concatenate FROM in scope FSCOPE onto TO in scope TSCOPE. */
373 #define SCOPE_LIST_CONCAT(tscope, to, fscope, from) do { \
374 struct c_scope *t_ = (tscope); \
375 struct c_scope *f_ = (fscope); \
377 TREE_CHAIN (t_->to##_last) = f_->from; \
380 t_->to##_last = f_->from##_last; \
383 /* True means unconditionally make a BLOCK for the next scope pushed. */
385 static bool keep_next_level_flag
;
387 /* True means the next call to push_scope will be the outermost scope
388 of a function body, so do not push a new scope, merely cease
389 expecting parameter decls. */
391 static bool next_is_function_body
;
393 /* Functions called automatically at the beginning and end of execution. */
395 static GTY(()) tree static_ctors
;
396 static GTY(()) tree static_dtors
;
398 /* Forward declarations. */
399 static tree
lookup_name_in_scope (tree
, struct c_scope
*);
400 static tree
c_make_fname_decl (tree
, int);
401 static tree
grokdeclarator (const struct c_declarator
*,
402 struct c_declspecs
*,
403 enum decl_context
, bool, tree
*);
404 static tree
grokparms (struct c_arg_info
*, bool);
405 static void layout_array_type (tree
);
407 /* States indicating how grokdeclarator() should handle declspecs marked
408 with __attribute__((deprecated)). An object declared as
409 __attribute__((deprecated)) suppresses warnings of uses of other
412 enum deprecated_states
{
417 static enum deprecated_states deprecated_state
= DEPRECATED_NORMAL
;
420 c_print_identifier (FILE *file
, tree node
, int indent
)
422 print_node (file
, "symbol", I_SYMBOL_DECL (node
), indent
+ 4);
423 print_node (file
, "tag", I_TAG_DECL (node
), indent
+ 4);
424 print_node (file
, "label", I_LABEL_DECL (node
), indent
+ 4);
425 if (C_IS_RESERVED_WORD (node
))
427 tree rid
= ridpointers
[C_RID_CODE (node
)];
428 indent_to (file
, indent
+ 4);
429 fprintf (file
, "rid " HOST_PTR_PRINTF
" \"%s\"",
430 (void *) rid
, IDENTIFIER_POINTER (rid
));
434 /* Establish a binding between NAME, an IDENTIFIER_NODE, and DECL,
435 which may be any of several kinds of DECL or TYPE or error_mark_node,
436 in the scope SCOPE. */
438 bind (tree name
, tree decl
, struct c_scope
*scope
, bool invisible
, bool nested
)
440 struct c_binding
*b
, **here
;
442 if (binding_freelist
)
444 b
= binding_freelist
;
445 binding_freelist
= b
->prev
;
448 b
= GGC_NEW (struct c_binding
);
453 b
->depth
= scope
->depth
;
454 b
->invisible
= invisible
;
460 b
->prev
= scope
->bindings
;
466 switch (TREE_CODE (decl
))
468 case LABEL_DECL
: here
= &I_LABEL_BINDING (name
); break;
471 case RECORD_TYPE
: here
= &I_TAG_BINDING (name
); break;
477 case ERROR_MARK
: here
= &I_SYMBOL_BINDING (name
); break;
483 /* Locate the appropriate place in the chain of shadowed decls
484 to insert this binding. Normally, scope == current_scope and
485 this does nothing. */
486 while (*here
&& (*here
)->depth
> scope
->depth
)
487 here
= &(*here
)->shadowed
;
493 /* Clear the binding structure B, stick it on the binding_freelist,
494 and return the former value of b->prev. This is used by pop_scope
495 and get_parm_info to iterate destructively over all the bindings
496 from a given scope. */
497 static struct c_binding
*
498 free_binding_and_advance (struct c_binding
*b
)
500 struct c_binding
*prev
= b
->prev
;
502 memset (b
, 0, sizeof (struct c_binding
));
503 b
->prev
= binding_freelist
;
504 binding_freelist
= b
;
510 /* Hook called at end of compilation to assume 1 elt
511 for a file-scope tentative array defn that wasn't complete before. */
514 c_finish_incomplete_decl (tree decl
)
516 if (TREE_CODE (decl
) == VAR_DECL
)
518 tree type
= TREE_TYPE (decl
);
519 if (type
!= error_mark_node
520 && TREE_CODE (type
) == ARRAY_TYPE
521 && !DECL_EXTERNAL (decl
)
522 && TYPE_DOMAIN (type
) == 0)
524 warning ("%Jarray %qD assumed to have one element", decl
, decl
);
526 complete_array_type (type
, NULL_TREE
, 1);
528 layout_decl (decl
, 0);
533 /* The Objective-C front-end often needs to determine the current scope. */
536 objc_get_current_scope (void)
538 return current_scope
;
541 /* The following function is used only by Objective-C. It needs to live here
542 because it accesses the innards of c_scope. */
545 objc_mark_locals_volatile (void *enclosing_blk
)
547 struct c_scope
*scope
;
550 for (scope
= current_scope
;
551 scope
&& scope
!= enclosing_blk
;
552 scope
= scope
->outer
)
554 for (b
= scope
->bindings
; b
; b
= b
->prev
)
556 if (TREE_CODE (b
->decl
) == VAR_DECL
557 || TREE_CODE (b
->decl
) == PARM_DECL
)
559 C_DECL_REGISTER (b
->decl
) = 0;
560 DECL_REGISTER (b
->decl
) = 0;
561 TREE_THIS_VOLATILE (b
->decl
) = 1;
565 /* Do not climb up past the current function. */
566 if (scope
->function_body
)
571 /* Nonzero if we are currently in file scope. */
574 global_bindings_p (void)
576 return current_scope
== file_scope
&& !c_override_global_bindings_to_false
;
580 keep_next_level (void)
582 keep_next_level_flag
= true;
585 /* Identify this scope as currently being filled with parameters. */
588 declare_parm_level (void)
590 current_scope
->parm_flag
= true;
596 if (next_is_function_body
)
598 /* This is the transition from the parameters to the top level
599 of the function body. These are the same scope
600 (C99 6.2.1p4,6) so we do not push another scope structure.
601 next_is_function_body is set only by store_parm_decls, which
602 in turn is called when and only when we are about to
603 encounter the opening curly brace for the function body.
605 The outermost block of a function always gets a BLOCK node,
606 because the debugging output routines expect that each
607 function has at least one BLOCK. */
608 current_scope
->parm_flag
= false;
609 current_scope
->function_body
= true;
610 current_scope
->keep
= true;
611 current_scope
->outer_function
= current_function_scope
;
612 current_function_scope
= current_scope
;
614 keep_next_level_flag
= false;
615 next_is_function_body
= false;
619 struct c_scope
*scope
;
622 scope
= scope_freelist
;
623 scope_freelist
= scope
->outer
;
626 scope
= GGC_CNEW (struct c_scope
);
628 scope
->keep
= keep_next_level_flag
;
629 scope
->outer
= current_scope
;
630 scope
->depth
= current_scope
? (current_scope
->depth
+ 1) : 0;
632 /* Check for scope depth overflow. Unlikely (2^28 == 268,435,456) but
634 if (current_scope
&& scope
->depth
== 0)
637 sorry ("GCC supports only %u nested scopes\n", scope
->depth
);
640 current_scope
= scope
;
641 keep_next_level_flag
= false;
645 /* Set the TYPE_CONTEXT of all of TYPE's variants to CONTEXT. */
648 set_type_context (tree type
, tree context
)
650 for (type
= TYPE_MAIN_VARIANT (type
); type
;
651 type
= TYPE_NEXT_VARIANT (type
))
652 TYPE_CONTEXT (type
) = context
;
655 /* Exit a scope. Restore the state of the identifier-decl mappings
656 that were in effect when this scope was entered. Return a BLOCK
657 node containing all the DECLs in this scope that are of interest
658 to debug info generation. */
663 struct c_scope
*scope
= current_scope
;
664 tree block
, context
, p
;
667 bool functionbody
= scope
->function_body
;
668 bool keep
= functionbody
|| scope
->keep
|| scope
->bindings
;
670 /* If appropriate, create a BLOCK to record the decls for the life
675 block
= make_node (BLOCK
);
676 BLOCK_SUBBLOCKS (block
) = scope
->blocks
;
677 TREE_USED (block
) = 1;
679 /* In each subblock, record that this is its superior. */
680 for (p
= scope
->blocks
; p
; p
= TREE_CHAIN (p
))
681 BLOCK_SUPERCONTEXT (p
) = block
;
683 BLOCK_VARS (block
) = 0;
686 /* The TYPE_CONTEXTs for all of the tagged types belonging to this
687 scope must be set so that they point to the appropriate
688 construct, i.e. either to the current FUNCTION_DECL node, or
689 else to the BLOCK node we just constructed.
691 Note that for tagged types whose scope is just the formal
692 parameter list for some function type specification, we can't
693 properly set their TYPE_CONTEXTs here, because we don't have a
694 pointer to the appropriate FUNCTION_TYPE node readily available
695 to us. For those cases, the TYPE_CONTEXTs of the relevant tagged
696 type nodes get set in `grokdeclarator' as soon as we have created
697 the FUNCTION_TYPE node which will represent the "scope" for these
698 "parameter list local" tagged types. */
699 if (scope
->function_body
)
700 context
= current_function_decl
;
701 else if (scope
== file_scope
)
703 tree file_decl
= build_decl (TRANSLATION_UNIT_DECL
, 0, 0);
704 TREE_CHAIN (file_decl
) = all_translation_units
;
705 all_translation_units
= file_decl
;
711 /* Clear all bindings in this scope. */
712 for (b
= scope
->bindings
; b
; b
= free_binding_and_advance (b
))
715 switch (TREE_CODE (p
))
718 /* Warnings for unused labels, errors for undefined labels. */
719 if (TREE_USED (p
) && !DECL_INITIAL (p
))
721 error ("%Jlabel %qD used but not defined", p
, p
);
722 DECL_INITIAL (p
) = error_mark_node
;
724 else if (!TREE_USED (p
) && warn_unused_label
)
726 if (DECL_INITIAL (p
))
727 warning ("%Jlabel %qD defined but not used", p
, p
);
729 warning ("%Jlabel %qD declared but not defined", p
, p
);
731 /* Labels go in BLOCK_VARS. */
732 TREE_CHAIN (p
) = BLOCK_VARS (block
);
733 BLOCK_VARS (block
) = p
;
734 gcc_assert (I_LABEL_BINDING (b
->id
) == b
);
735 I_LABEL_BINDING (b
->id
) = b
->shadowed
;
741 set_type_context (p
, context
);
743 /* Types may not have tag-names, in which case the type
744 appears in the bindings list with b->id NULL. */
747 gcc_assert (I_TAG_BINDING (b
->id
) == b
);
748 I_TAG_BINDING (b
->id
) = b
->shadowed
;
753 /* Propagate TREE_ADDRESSABLE from nested functions to their
754 containing functions. */
755 if (!TREE_ASM_WRITTEN (p
)
756 && DECL_INITIAL (p
) != 0
757 && TREE_ADDRESSABLE (p
)
758 && DECL_ABSTRACT_ORIGIN (p
) != 0
759 && DECL_ABSTRACT_ORIGIN (p
) != p
)
760 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (p
)) = 1;
764 /* Warnings for unused variables. */
765 if (warn_unused_variable
767 && !DECL_IN_SYSTEM_HEADER (p
)
769 && !DECL_ARTIFICIAL (p
)
770 && scope
!= file_scope
771 && scope
!= external_scope
)
772 warning ("%Junused variable %qD", p
, p
);
776 error ("%Jtype of array %qD completed incompatibly with"
777 " implicit initialization", p
, p
);
784 /* All of these go in BLOCK_VARS, but only if this is the
785 binding in the home scope. */
788 TREE_CHAIN (p
) = BLOCK_VARS (block
);
789 BLOCK_VARS (block
) = p
;
791 /* If this is the file scope, and we are processing more
792 than one translation unit in this compilation, set
793 DECL_CONTEXT of each decl to the TRANSLATION_UNIT_DECL.
794 This makes same_translation_unit_p work, and causes
795 static declarations to be given disambiguating suffixes. */
796 if (scope
== file_scope
&& num_in_fnames
> 1)
798 DECL_CONTEXT (p
) = context
;
799 if (TREE_CODE (p
) == TYPE_DECL
)
800 set_type_context (TREE_TYPE (p
), context
);
804 /* Parameters go in DECL_ARGUMENTS, not BLOCK_VARS, and have
805 already been put there by store_parm_decls. Unused-
806 parameter warnings are handled by function.c.
807 error_mark_node obviously does not go in BLOCK_VARS and
808 does not get unused-variable warnings. */
811 /* It is possible for a decl not to have a name. We get
812 here with b->id NULL in this case. */
815 gcc_assert (I_SYMBOL_BINDING (b
->id
) == b
);
816 I_SYMBOL_BINDING (b
->id
) = b
->shadowed
;
817 if (b
->shadowed
&& b
->shadowed
->type
)
818 TREE_TYPE (b
->shadowed
->decl
) = b
->shadowed
->type
;
828 /* Dispose of the block that we just made inside some higher level. */
829 if ((scope
->function_body
|| scope
== file_scope
) && context
)
831 DECL_INITIAL (context
) = block
;
832 BLOCK_SUPERCONTEXT (block
) = context
;
834 else if (scope
->outer
)
837 SCOPE_LIST_APPEND (scope
->outer
, blocks
, block
);
838 /* If we did not make a block for the scope just exited, any
839 blocks made for inner scopes must be carried forward so they
840 will later become subblocks of something else. */
841 else if (scope
->blocks
)
842 SCOPE_LIST_CONCAT (scope
->outer
, blocks
, scope
, blocks
);
845 /* Pop the current scope, and free the structure for reuse. */
846 current_scope
= scope
->outer
;
847 if (scope
->function_body
)
848 current_function_scope
= scope
->outer_function
;
850 memset (scope
, 0, sizeof (struct c_scope
));
851 scope
->outer
= scope_freelist
;
852 scope_freelist
= scope
;
858 push_file_scope (void)
866 file_scope
= current_scope
;
868 start_fname_decls ();
870 for (decl
= visible_builtins
; decl
; decl
= TREE_CHAIN (decl
))
871 bind (DECL_NAME (decl
), decl
, file_scope
,
872 /*invisible=*/false, /*nested=*/true);
876 pop_file_scope (void)
878 /* In case there were missing closebraces, get us back to the global
880 while (current_scope
!= file_scope
)
883 /* __FUNCTION__ is defined at file scope (""). This
884 call may not be necessary as my tests indicate it
885 still works without it. */
886 finish_fname_decls ();
888 /* This is the point to write out a PCH if we're doing that.
889 In that case we do not want to do anything else. */
892 c_common_write_pch ();
896 /* Pop off the file scope and close this translation unit. */
899 cgraph_finalize_compilation_unit ();
902 /* Insert BLOCK at the end of the list of subblocks of the current
903 scope. This is used when a BIND_EXPR is expanded, to handle the
904 BLOCK node inside the BIND_EXPR. */
907 insert_block (tree block
)
909 TREE_USED (block
) = 1;
910 SCOPE_LIST_APPEND (current_scope
, blocks
, block
);
913 /* Push a definition or a declaration of struct, union or enum tag "name".
914 "type" should be the type node.
915 We assume that the tag "name" is not already defined.
917 Note that the definition may really be just a forward reference.
918 In that case, the TYPE_SIZE will be zero. */
921 pushtag (tree name
, tree type
)
923 /* Record the identifier as the type's name if it has none. */
924 if (name
&& !TYPE_NAME (type
))
925 TYPE_NAME (type
) = name
;
926 bind (name
, type
, current_scope
, /*invisible=*/false, /*nested=*/false);
928 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
929 tagged type we just added to the current scope. This fake
930 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
931 to output a representation of a tagged type, and it also gives
932 us a convenient place to record the "scope start" address for the
935 TYPE_STUB_DECL (type
) = pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, type
));
937 /* An approximation for now, so we can tell this is a function-scope tag.
938 This will be updated in pop_scope. */
939 TYPE_CONTEXT (type
) = DECL_CONTEXT (TYPE_STUB_DECL (type
));
942 /* Subroutine of compare_decls. Allow harmless mismatches in return
943 and argument types provided that the type modes match. This function
944 return a unified type given a suitable match, and 0 otherwise. */
947 match_builtin_function_types (tree newtype
, tree oldtype
)
949 tree newrettype
, oldrettype
;
950 tree newargs
, oldargs
;
951 tree trytype
, tryargs
;
953 /* Accept the return type of the new declaration if same modes. */
954 oldrettype
= TREE_TYPE (oldtype
);
955 newrettype
= TREE_TYPE (newtype
);
957 if (TYPE_MODE (oldrettype
) != TYPE_MODE (newrettype
))
960 oldargs
= TYPE_ARG_TYPES (oldtype
);
961 newargs
= TYPE_ARG_TYPES (newtype
);
964 while (oldargs
|| newargs
)
968 || !TREE_VALUE (oldargs
)
969 || !TREE_VALUE (newargs
)
970 || TYPE_MODE (TREE_VALUE (oldargs
))
971 != TYPE_MODE (TREE_VALUE (newargs
)))
974 oldargs
= TREE_CHAIN (oldargs
);
975 newargs
= TREE_CHAIN (newargs
);
978 trytype
= build_function_type (newrettype
, tryargs
);
979 return build_type_attribute_variant (trytype
, TYPE_ATTRIBUTES (oldtype
));
982 /* Subroutine of diagnose_mismatched_decls. Check for function type
983 mismatch involving an empty arglist vs a nonempty one and give clearer
986 diagnose_arglist_conflict (tree newdecl
, tree olddecl
,
987 tree newtype
, tree oldtype
)
991 if (TREE_CODE (olddecl
) != FUNCTION_DECL
992 || !comptypes (TREE_TYPE (oldtype
), TREE_TYPE (newtype
))
993 || !((TYPE_ARG_TYPES (oldtype
) == 0 && DECL_INITIAL (olddecl
) == 0)
995 (TYPE_ARG_TYPES (newtype
) == 0 && DECL_INITIAL (newdecl
) == 0)))
998 t
= TYPE_ARG_TYPES (oldtype
);
1000 t
= TYPE_ARG_TYPES (newtype
);
1001 for (; t
; t
= TREE_CHAIN (t
))
1003 tree type
= TREE_VALUE (t
);
1005 if (TREE_CHAIN (t
) == 0
1006 && TYPE_MAIN_VARIANT (type
) != void_type_node
)
1008 inform ("a parameter list with an ellipsis can't match "
1009 "an empty parameter name list declaration");
1013 if (c_type_promotes_to (type
) != type
)
1015 inform ("an argument type that has a default promotion can't match "
1016 "an empty parameter name list declaration");
1022 /* Another subroutine of diagnose_mismatched_decls. OLDDECL is an
1023 old-style function definition, NEWDECL is a prototype declaration.
1024 Diagnose inconsistencies in the argument list. Returns TRUE if
1025 the prototype is compatible, FALSE if not. */
1027 validate_proto_after_old_defn (tree newdecl
, tree newtype
, tree oldtype
)
1029 tree newargs
, oldargs
;
1032 /* ??? Elsewhere TYPE_MAIN_VARIANT is not used in this context. */
1033 #define END_OF_ARGLIST(t) (TYPE_MAIN_VARIANT (t) == void_type_node)
1035 oldargs
= TYPE_ACTUAL_ARG_TYPES (oldtype
);
1036 newargs
= TYPE_ARG_TYPES (newtype
);
1041 tree oldargtype
= TREE_VALUE (oldargs
);
1042 tree newargtype
= TREE_VALUE (newargs
);
1044 if (END_OF_ARGLIST (oldargtype
) && END_OF_ARGLIST (newargtype
))
1047 /* Reaching the end of just one list means the two decls don't
1048 agree on the number of arguments. */
1049 if (END_OF_ARGLIST (oldargtype
))
1051 error ("%Jprototype for %qD declares more arguments "
1052 "than previous old-style definition", newdecl
, newdecl
);
1055 else if (END_OF_ARGLIST (newargtype
))
1057 error ("%Jprototype for %qD declares fewer arguments "
1058 "than previous old-style definition", newdecl
, newdecl
);
1062 /* Type for passing arg must be consistent with that declared
1064 else if (!comptypes (oldargtype
, newargtype
))
1066 error ("%Jprototype for %qD declares arg %d with incompatible type",
1067 newdecl
, newdecl
, i
);
1071 oldargs
= TREE_CHAIN (oldargs
);
1072 newargs
= TREE_CHAIN (newargs
);
1076 /* If we get here, no errors were found, but do issue a warning
1077 for this poor-style construct. */
1078 warning ("%Jprototype for %qD follows non-prototype definition",
1081 #undef END_OF_ARGLIST
1084 /* Subroutine of diagnose_mismatched_decls. Report the location of DECL,
1085 first in a pair of mismatched declarations, using the diagnostic
1088 locate_old_decl (tree decl
, void (*diag
)(const char *, ...))
1090 if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_BUILT_IN (decl
))
1092 else if (DECL_INITIAL (decl
))
1093 diag (N_("%Jprevious definition of %qD was here"), decl
, decl
);
1094 else if (C_DECL_IMPLICIT (decl
))
1095 diag (N_("%Jprevious implicit declaration of %qD was here"), decl
, decl
);
1097 diag (N_("%Jprevious declaration of %qD was here"), decl
, decl
);
1100 /* Subroutine of duplicate_decls. Compare NEWDECL to OLDDECL.
1101 Returns true if the caller should proceed to merge the two, false
1102 if OLDDECL should simply be discarded. As a side effect, issues
1103 all necessary diagnostics for invalid or poor-style combinations.
1104 If it returns true, writes the types of NEWDECL and OLDDECL to
1105 *NEWTYPEP and *OLDTYPEP - these may have been adjusted from
1106 TREE_TYPE (NEWDECL, OLDDECL) respectively. */
1109 diagnose_mismatched_decls (tree newdecl
, tree olddecl
,
1110 tree
*newtypep
, tree
*oldtypep
)
1112 tree newtype
, oldtype
;
1113 bool pedwarned
= false;
1114 bool warned
= false;
1116 /* If we have error_mark_node for either decl or type, just discard
1117 the previous decl - we're in an error cascade already. */
1118 if (olddecl
== error_mark_node
|| newdecl
== error_mark_node
)
1120 *oldtypep
= oldtype
= TREE_TYPE (olddecl
);
1121 *newtypep
= newtype
= TREE_TYPE (newdecl
);
1122 if (oldtype
== error_mark_node
|| newtype
== error_mark_node
)
1125 /* Two different categories of symbol altogether. This is an error
1126 unless OLDDECL is a builtin. OLDDECL will be discarded in any case. */
1127 if (TREE_CODE (olddecl
) != TREE_CODE (newdecl
))
1129 if (!(TREE_CODE (olddecl
) == FUNCTION_DECL
1130 && DECL_BUILT_IN (olddecl
)
1131 && !C_DECL_DECLARED_BUILTIN (olddecl
)))
1133 error ("%J%qD redeclared as different kind of symbol",
1135 locate_old_decl (olddecl
, error
);
1137 else if (TREE_PUBLIC (newdecl
))
1138 warning ("%Jbuilt-in function %qD declared as non-function",
1140 else if (warn_shadow
)
1141 warning ("%Jdeclaration of %qD shadows a built-in function",
1146 /* Enumerators have no linkage, so may only be declared once in a
1148 if (TREE_CODE (olddecl
) == CONST_DECL
)
1150 error ("%Jredeclaration of enumerator %qD", newdecl
, newdecl
);
1151 locate_old_decl (olddecl
, error
);
1155 if (!comptypes (oldtype
, newtype
))
1157 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1158 && DECL_BUILT_IN (olddecl
) && !C_DECL_DECLARED_BUILTIN (olddecl
))
1160 /* Accept harmless mismatch in function types.
1161 This is for the ffs and fprintf builtins. */
1162 tree trytype
= match_builtin_function_types (newtype
, oldtype
);
1164 if (trytype
&& comptypes (newtype
, trytype
))
1165 *oldtypep
= oldtype
= trytype
;
1168 /* If types don't match for a built-in, throw away the
1169 built-in. No point in calling locate_old_decl here, it
1170 won't print anything. */
1171 warning ("%Jconflicting types for built-in function %qD",
1176 else if (TREE_CODE (olddecl
) == FUNCTION_DECL
1177 && DECL_IS_BUILTIN (olddecl
))
1179 /* A conflicting function declaration for a predeclared
1180 function that isn't actually built in. Objective C uses
1181 these. The new declaration silently overrides everything
1182 but the volatility (i.e. noreturn) indication. See also
1183 below. FIXME: Make Objective C use normal builtins. */
1184 TREE_THIS_VOLATILE (newdecl
) |= TREE_THIS_VOLATILE (olddecl
);
1187 /* Permit void foo (...) to match int foo (...) if the latter is
1188 the definition and implicit int was used. See
1189 c-torture/compile/920625-2.c. */
1190 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
&& DECL_INITIAL (newdecl
)
1191 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype
)) == void_type_node
1192 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype
)) == integer_type_node
1193 && C_FUNCTION_IMPLICIT_INT (newdecl
))
1195 pedwarn ("%Jconflicting types for %qD", newdecl
, newdecl
);
1196 /* Make sure we keep void as the return type. */
1197 TREE_TYPE (newdecl
) = *newtypep
= newtype
= oldtype
;
1198 C_FUNCTION_IMPLICIT_INT (newdecl
) = 0;
1203 if (TYPE_QUALS (newtype
) != TYPE_QUALS (oldtype
))
1204 error ("%J conflicting type qualifiers for %qD", newdecl
, newdecl
);
1206 error ("%Jconflicting types for %qD", newdecl
, newdecl
);
1207 diagnose_arglist_conflict (newdecl
, olddecl
, newtype
, oldtype
);
1208 locate_old_decl (olddecl
, error
);
1213 /* Redeclaration of a type is a constraint violation (6.7.2.3p1),
1214 but silently ignore the redeclaration if either is in a system
1215 header. (Conflicting redeclarations were handled above.) */
1216 if (TREE_CODE (newdecl
) == TYPE_DECL
)
1218 if (DECL_IN_SYSTEM_HEADER (newdecl
) || DECL_IN_SYSTEM_HEADER (olddecl
))
1219 return true; /* Allow OLDDECL to continue in use. */
1221 error ("%Jredefinition of typedef %qD", newdecl
, newdecl
);
1222 locate_old_decl (olddecl
, error
);
1226 /* Function declarations can either be 'static' or 'extern' (no
1227 qualifier is equivalent to 'extern' - C99 6.2.2p5) and therefore
1228 can never conflict with each other on account of linkage (6.2.2p4).
1229 Multiple definitions are not allowed (6.9p3,5) but GCC permits
1230 two definitions if one is 'extern inline' and one is not. The non-
1231 extern-inline definition supersedes the extern-inline definition. */
1232 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1234 /* If you declare a built-in function name as static, or
1235 define the built-in with an old-style definition (so we
1236 can't validate the argument list) the built-in definition is
1237 overridden, but optionally warn this was a bad choice of name. */
1238 if (DECL_BUILT_IN (olddecl
)
1239 && !C_DECL_DECLARED_BUILTIN (olddecl
)
1240 && (!TREE_PUBLIC (newdecl
)
1241 || (DECL_INITIAL (newdecl
)
1242 && !TYPE_ARG_TYPES (TREE_TYPE (newdecl
)))))
1245 warning ("%Jdeclaration of %qD shadows a built-in function",
1247 /* Discard the old built-in function. */
1251 if (DECL_INITIAL (newdecl
))
1253 if (DECL_INITIAL (olddecl
)
1254 && !(DECL_DECLARED_INLINE_P (olddecl
)
1255 && DECL_EXTERNAL (olddecl
)
1256 && !(DECL_DECLARED_INLINE_P (newdecl
)
1257 && DECL_EXTERNAL (newdecl
)
1258 && same_translation_unit_p (olddecl
, newdecl
))))
1260 error ("%Jredefinition of %qD", newdecl
, newdecl
);
1261 locate_old_decl (olddecl
, error
);
1265 /* If we have a prototype after an old-style function definition,
1266 the argument types must be checked specially. */
1267 else if (DECL_INITIAL (olddecl
)
1268 && !TYPE_ARG_TYPES (oldtype
) && TYPE_ARG_TYPES (newtype
)
1269 && TYPE_ACTUAL_ARG_TYPES (oldtype
)
1270 && !validate_proto_after_old_defn (newdecl
, newtype
, oldtype
))
1272 locate_old_decl (olddecl
, error
);
1275 /* A non-static declaration (even an "extern") followed by a
1276 static declaration is undefined behavior per C99 6.2.2p3-5,7.
1277 The same is true for a static forward declaration at block
1278 scope followed by a non-static declaration/definition at file
1279 scope. Static followed by non-static at the same scope is
1280 not undefined behavior, and is the most convenient way to get
1281 some effects (see e.g. what unwind-dw2-fde-glibc.c does to
1282 the definition of _Unwind_Find_FDE in unwind-dw2-fde.c), but
1283 we do diagnose it if -Wtraditional. */
1284 if (TREE_PUBLIC (olddecl
) && !TREE_PUBLIC (newdecl
))
1286 /* Two exceptions to the rule. If olddecl is an extern
1287 inline, or a predeclared function that isn't actually
1288 built in, newdecl silently overrides olddecl. The latter
1289 occur only in Objective C; see also above. (FIXME: Make
1290 Objective C use normal builtins.) */
1291 if (!DECL_IS_BUILTIN (olddecl
)
1292 && !(DECL_EXTERNAL (olddecl
)
1293 && DECL_DECLARED_INLINE_P (olddecl
)))
1295 error ("%Jstatic declaration of %qD follows "
1296 "non-static declaration", newdecl
, newdecl
);
1297 locate_old_decl (olddecl
, error
);
1301 else if (TREE_PUBLIC (newdecl
) && !TREE_PUBLIC (olddecl
))
1303 if (DECL_CONTEXT (olddecl
))
1305 error ("%Jnon-static declaration of %qD follows "
1306 "static declaration", newdecl
, newdecl
);
1307 locate_old_decl (olddecl
, error
);
1310 else if (warn_traditional
)
1312 warning ("%Jnon-static declaration of %qD follows "
1313 "static declaration", newdecl
, newdecl
);
1318 else if (TREE_CODE (newdecl
) == VAR_DECL
)
1320 /* Only variables can be thread-local, and all declarations must
1321 agree on this property. */
1322 if (DECL_THREAD_LOCAL (newdecl
) != DECL_THREAD_LOCAL (olddecl
))
1324 if (DECL_THREAD_LOCAL (newdecl
))
1325 error ("%Jthread-local declaration of %qD follows "
1326 "non-thread-local declaration", newdecl
, newdecl
);
1328 error ("%Jnon-thread-local declaration of %qD follows "
1329 "thread-local declaration", newdecl
, newdecl
);
1331 locate_old_decl (olddecl
, error
);
1335 /* Multiple initialized definitions are not allowed (6.9p3,5). */
1336 if (DECL_INITIAL (newdecl
) && DECL_INITIAL (olddecl
))
1338 error ("%Jredefinition of %qD", newdecl
, newdecl
);
1339 locate_old_decl (olddecl
, error
);
1343 /* Objects declared at file scope: if the first declaration had
1344 external linkage (even if it was an external reference) the
1345 second must have external linkage as well, or the behavior is
1346 undefined. If the first declaration had internal linkage, then
1347 the second must too, or else be an external reference (in which
1348 case the composite declaration still has internal linkage).
1349 As for function declarations, we warn about the static-then-
1350 extern case only for -Wtraditional. See generally 6.2.2p3-5,7. */
1351 if (DECL_FILE_SCOPE_P (newdecl
)
1352 && TREE_PUBLIC (newdecl
) != TREE_PUBLIC (olddecl
))
1354 if (DECL_EXTERNAL (newdecl
))
1356 if (!DECL_FILE_SCOPE_P (olddecl
))
1358 error ("%Jextern declaration of %qD follows "
1359 "declaration with no linkage", newdecl
, newdecl
);
1360 locate_old_decl (olddecl
, error
);
1363 else if (warn_traditional
)
1365 warning ("%Jnon-static declaration of %qD follows "
1366 "static declaration", newdecl
, newdecl
);
1372 if (TREE_PUBLIC (newdecl
))
1373 error ("%Jnon-static declaration of %qD follows "
1374 "static declaration", newdecl
, newdecl
);
1376 error ("%Jstatic declaration of %qD follows "
1377 "non-static declaration", newdecl
, newdecl
);
1379 locate_old_decl (olddecl
, error
);
1383 /* Two objects with the same name declared at the same block
1384 scope must both be external references (6.7p3). */
1385 else if (!DECL_FILE_SCOPE_P (newdecl
))
1387 if (DECL_EXTERNAL (newdecl
))
1389 /* Extern with initializer at block scope, which will
1390 already have received an error. */
1392 else if (DECL_EXTERNAL (olddecl
))
1394 error ("%Jdeclaration of %qD with no linkage follows "
1395 "extern declaration", newdecl
, newdecl
);
1396 locate_old_decl (olddecl
, error
);
1400 error ("%Jredeclaration of %qD with no linkage",
1402 locate_old_decl (olddecl
, error
);
1410 /* All decls must agree on a visibility. */
1411 if (DECL_VISIBILITY_SPECIFIED (newdecl
) && DECL_VISIBILITY_SPECIFIED (olddecl
)
1412 && DECL_VISIBILITY (newdecl
) != DECL_VISIBILITY (olddecl
))
1414 warning ("%Jredeclaration of %qD with different visibility "
1415 "(old visibility preserved)", newdecl
, newdecl
);
1419 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1421 /* Diagnose inline __attribute__ ((noinline)) which is silly. */
1422 if (DECL_DECLARED_INLINE_P (newdecl
)
1423 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl
)))
1425 warning ("%Jinline declaration of %qD follows "
1426 "declaration with attribute noinline", newdecl
, newdecl
);
1429 else if (DECL_DECLARED_INLINE_P (olddecl
)
1430 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl
)))
1432 warning ("%Jdeclaration of %qD with attribute noinline follows "
1433 "inline declaration ", newdecl
, newdecl
);
1437 /* Inline declaration after use or definition.
1438 ??? Should we still warn about this now we have unit-at-a-time
1439 mode and can get it right?
1440 Definitely don't complain if the decls are in different translation
1442 if (DECL_DECLARED_INLINE_P (newdecl
) && !DECL_DECLARED_INLINE_P (olddecl
)
1443 && same_translation_unit_p (olddecl
, newdecl
))
1445 if (TREE_USED (olddecl
))
1447 warning ("%J%qD declared inline after being called",
1451 else if (DECL_INITIAL (olddecl
))
1453 warning ("%J%qD declared inline after its definition",
1459 else /* PARM_DECL, VAR_DECL */
1461 /* Redeclaration of a parameter is a constraint violation (this is
1462 not explicitly stated, but follows from C99 6.7p3 [no more than
1463 one declaration of the same identifier with no linkage in the
1464 same scope, except type tags] and 6.2.2p6 [parameters have no
1465 linkage]). We must check for a forward parameter declaration,
1466 indicated by TREE_ASM_WRITTEN on the old declaration - this is
1467 an extension, the mandatory diagnostic for which is handled by
1468 mark_forward_parm_decls. */
1470 if (TREE_CODE (newdecl
) == PARM_DECL
1471 && (!TREE_ASM_WRITTEN (olddecl
) || TREE_ASM_WRITTEN (newdecl
)))
1473 error ("%Jredefinition of parameter %qD", newdecl
, newdecl
);
1474 locate_old_decl (olddecl
, error
);
1479 /* Optional warning for completely redundant decls. */
1480 if (!warned
&& !pedwarned
1481 && warn_redundant_decls
1482 /* Don't warn about a function declaration followed by a
1484 && !(TREE_CODE (newdecl
) == FUNCTION_DECL
1485 && DECL_INITIAL (newdecl
) && !DECL_INITIAL (olddecl
))
1486 /* Don't warn about redundant redeclarations of builtins. */
1487 && !(TREE_CODE (newdecl
) == FUNCTION_DECL
1488 && !DECL_BUILT_IN (newdecl
)
1489 && DECL_BUILT_IN (olddecl
)
1490 && !C_DECL_DECLARED_BUILTIN (olddecl
))
1491 /* Don't warn about an extern followed by a definition. */
1492 && !(DECL_EXTERNAL (olddecl
) && !DECL_EXTERNAL (newdecl
))
1493 /* Don't warn about forward parameter decls. */
1494 && !(TREE_CODE (newdecl
) == PARM_DECL
1495 && TREE_ASM_WRITTEN (olddecl
) && !TREE_ASM_WRITTEN (newdecl
)))
1497 warning ("%Jredundant redeclaration of %qD", newdecl
, newdecl
);
1501 /* Report location of previous decl/defn in a consistent manner. */
1502 if (warned
|| pedwarned
)
1503 locate_old_decl (olddecl
, pedwarned
? pedwarn
: warning
);
1508 /* Subroutine of duplicate_decls. NEWDECL has been found to be
1509 consistent with OLDDECL, but carries new information. Merge the
1510 new information into OLDDECL. This function issues no
1514 merge_decls (tree newdecl
, tree olddecl
, tree newtype
, tree oldtype
)
1516 int new_is_definition
= (TREE_CODE (newdecl
) == FUNCTION_DECL
1517 && DECL_INITIAL (newdecl
) != 0);
1519 /* For real parm decl following a forward decl, rechain the old decl
1520 in its new location and clear TREE_ASM_WRITTEN (it's not a
1521 forward decl anymore). */
1522 if (TREE_CODE (newdecl
) == PARM_DECL
1523 && TREE_ASM_WRITTEN (olddecl
) && !TREE_ASM_WRITTEN (newdecl
))
1525 struct c_binding
*b
, **here
;
1527 for (here
= ¤t_scope
->bindings
; *here
; here
= &(*here
)->prev
)
1528 if ((*here
)->decl
== olddecl
)
1535 b
->prev
= current_scope
->bindings
;
1536 current_scope
->bindings
= b
;
1538 TREE_ASM_WRITTEN (olddecl
) = 0;
1541 DECL_ATTRIBUTES (newdecl
)
1542 = targetm
.merge_decl_attributes (olddecl
, newdecl
);
1544 /* Merge the data types specified in the two decls. */
1546 = TREE_TYPE (olddecl
)
1547 = composite_type (newtype
, oldtype
);
1549 /* Lay the type out, unless already done. */
1550 if (!comptypes (oldtype
, TREE_TYPE (newdecl
)))
1552 if (TREE_TYPE (newdecl
) != error_mark_node
)
1553 layout_type (TREE_TYPE (newdecl
));
1554 if (TREE_CODE (newdecl
) != FUNCTION_DECL
1555 && TREE_CODE (newdecl
) != TYPE_DECL
1556 && TREE_CODE (newdecl
) != CONST_DECL
)
1557 layout_decl (newdecl
, 0);
1561 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1562 DECL_SIZE (newdecl
) = DECL_SIZE (olddecl
);
1563 DECL_SIZE_UNIT (newdecl
) = DECL_SIZE_UNIT (olddecl
);
1564 DECL_MODE (newdecl
) = DECL_MODE (olddecl
);
1565 if (TREE_CODE (olddecl
) != FUNCTION_DECL
)
1566 if (DECL_ALIGN (olddecl
) > DECL_ALIGN (newdecl
))
1568 DECL_ALIGN (newdecl
) = DECL_ALIGN (olddecl
);
1569 DECL_USER_ALIGN (newdecl
) |= DECL_ALIGN (olddecl
);
1573 /* Keep the old rtl since we can safely use it. */
1574 COPY_DECL_RTL (olddecl
, newdecl
);
1576 /* Merge the type qualifiers. */
1577 if (TREE_READONLY (newdecl
))
1578 TREE_READONLY (olddecl
) = 1;
1580 if (TREE_THIS_VOLATILE (newdecl
))
1582 TREE_THIS_VOLATILE (olddecl
) = 1;
1583 if (TREE_CODE (newdecl
) == VAR_DECL
)
1584 make_var_volatile (newdecl
);
1587 /* Merge deprecatedness. */
1588 if (TREE_DEPRECATED (newdecl
))
1589 TREE_DEPRECATED (olddecl
) = 1;
1591 /* Keep source location of definition rather than declaration. */
1592 if (DECL_INITIAL (newdecl
) == 0 && DECL_INITIAL (olddecl
) != 0)
1593 DECL_SOURCE_LOCATION (newdecl
) = DECL_SOURCE_LOCATION (olddecl
);
1595 /* Merge the unused-warning information. */
1596 if (DECL_IN_SYSTEM_HEADER (olddecl
))
1597 DECL_IN_SYSTEM_HEADER (newdecl
) = 1;
1598 else if (DECL_IN_SYSTEM_HEADER (newdecl
))
1599 DECL_IN_SYSTEM_HEADER (olddecl
) = 1;
1601 /* Merge the initialization information. */
1602 if (DECL_INITIAL (newdecl
) == 0)
1603 DECL_INITIAL (newdecl
) = DECL_INITIAL (olddecl
);
1605 /* Merge the section attribute.
1606 We want to issue an error if the sections conflict but that must be
1607 done later in decl_attributes since we are called before attributes
1609 if (DECL_SECTION_NAME (newdecl
) == NULL_TREE
)
1610 DECL_SECTION_NAME (newdecl
) = DECL_SECTION_NAME (olddecl
);
1612 /* Copy the assembler name.
1613 Currently, it can only be defined in the prototype. */
1614 COPY_DECL_ASSEMBLER_NAME (olddecl
, newdecl
);
1616 /* Use visibility of whichever declaration had it specified */
1617 if (DECL_VISIBILITY_SPECIFIED (olddecl
))
1619 DECL_VISIBILITY (newdecl
) = DECL_VISIBILITY (olddecl
);
1620 DECL_VISIBILITY_SPECIFIED (newdecl
) = 1;
1623 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1625 DECL_STATIC_CONSTRUCTOR(newdecl
) |= DECL_STATIC_CONSTRUCTOR(olddecl
);
1626 DECL_STATIC_DESTRUCTOR (newdecl
) |= DECL_STATIC_DESTRUCTOR (olddecl
);
1627 DECL_NO_LIMIT_STACK (newdecl
) |= DECL_NO_LIMIT_STACK (olddecl
);
1628 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl
)
1629 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl
);
1630 TREE_THIS_VOLATILE (newdecl
) |= TREE_THIS_VOLATILE (olddecl
);
1631 TREE_READONLY (newdecl
) |= TREE_READONLY (olddecl
);
1632 DECL_IS_MALLOC (newdecl
) |= DECL_IS_MALLOC (olddecl
);
1633 DECL_IS_PURE (newdecl
) |= DECL_IS_PURE (olddecl
);
1636 /* Merge the storage class information. */
1637 merge_weak (newdecl
, olddecl
);
1639 /* For functions, static overrides non-static. */
1640 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1642 TREE_PUBLIC (newdecl
) &= TREE_PUBLIC (olddecl
);
1643 /* This is since we don't automatically
1644 copy the attributes of NEWDECL into OLDDECL. */
1645 TREE_PUBLIC (olddecl
) = TREE_PUBLIC (newdecl
);
1646 /* If this clears `static', clear it in the identifier too. */
1647 if (!TREE_PUBLIC (olddecl
))
1648 TREE_PUBLIC (DECL_NAME (olddecl
)) = 0;
1650 if (DECL_EXTERNAL (newdecl
))
1652 TREE_STATIC (newdecl
) = TREE_STATIC (olddecl
);
1653 DECL_EXTERNAL (newdecl
) = DECL_EXTERNAL (olddecl
);
1655 /* An extern decl does not override previous storage class. */
1656 TREE_PUBLIC (newdecl
) = TREE_PUBLIC (olddecl
);
1657 if (!DECL_EXTERNAL (newdecl
))
1659 DECL_CONTEXT (newdecl
) = DECL_CONTEXT (olddecl
);
1660 DECL_COMMON (newdecl
) = DECL_COMMON (olddecl
);
1665 TREE_STATIC (olddecl
) = TREE_STATIC (newdecl
);
1666 TREE_PUBLIC (olddecl
) = TREE_PUBLIC (newdecl
);
1669 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1671 /* If we're redefining a function previously defined as extern
1672 inline, make sure we emit debug info for the inline before we
1673 throw it away, in case it was inlined into a function that hasn't
1674 been written out yet. */
1675 if (new_is_definition
&& DECL_INITIAL (olddecl
))
1677 if (TREE_USED (olddecl
)
1678 /* In unit-at-a-time mode we never inline re-defined extern
1679 inline functions. */
1680 && !flag_unit_at_a_time
1681 && cgraph_function_possibly_inlined_p (olddecl
))
1682 (*debug_hooks
->outlining_inline_function
) (olddecl
);
1684 /* The new defn must not be inline. */
1685 DECL_INLINE (newdecl
) = 0;
1686 DECL_UNINLINABLE (newdecl
) = 1;
1690 /* If either decl says `inline', this fn is inline,
1691 unless its definition was passed already. */
1692 if (DECL_DECLARED_INLINE_P (newdecl
)
1693 || DECL_DECLARED_INLINE_P (olddecl
))
1694 DECL_DECLARED_INLINE_P (newdecl
) = 1;
1696 DECL_UNINLINABLE (newdecl
) = DECL_UNINLINABLE (olddecl
)
1697 = (DECL_UNINLINABLE (newdecl
) || DECL_UNINLINABLE (olddecl
));
1700 if (DECL_BUILT_IN (olddecl
))
1702 /* If redeclaring a builtin function, it stays built in.
1703 But it gets tagged as having been declared. */
1704 DECL_BUILT_IN_CLASS (newdecl
) = DECL_BUILT_IN_CLASS (olddecl
);
1705 DECL_FUNCTION_CODE (newdecl
) = DECL_FUNCTION_CODE (olddecl
);
1706 C_DECL_DECLARED_BUILTIN (newdecl
) = 1;
1709 /* Also preserve various other info from the definition. */
1710 if (!new_is_definition
)
1712 DECL_RESULT (newdecl
) = DECL_RESULT (olddecl
);
1713 DECL_INITIAL (newdecl
) = DECL_INITIAL (olddecl
);
1714 DECL_STRUCT_FUNCTION (newdecl
) = DECL_STRUCT_FUNCTION (olddecl
);
1715 DECL_SAVED_TREE (newdecl
) = DECL_SAVED_TREE (olddecl
);
1716 DECL_ARGUMENTS (newdecl
) = DECL_ARGUMENTS (olddecl
);
1718 /* Set DECL_INLINE on the declaration if we've got a body
1719 from which to instantiate. */
1720 if (DECL_INLINE (olddecl
) && !DECL_UNINLINABLE (newdecl
))
1722 DECL_INLINE (newdecl
) = 1;
1723 DECL_ABSTRACT_ORIGIN (newdecl
)
1724 = DECL_ABSTRACT_ORIGIN (olddecl
);
1729 /* If a previous declaration said inline, mark the
1730 definition as inlinable. */
1731 if (DECL_DECLARED_INLINE_P (newdecl
)
1732 && !DECL_UNINLINABLE (newdecl
))
1733 DECL_INLINE (newdecl
) = 1;
1737 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
1738 But preserve OLDDECL's DECL_UID and DECL_CONTEXT. */
1740 unsigned olddecl_uid
= DECL_UID (olddecl
);
1741 tree olddecl_context
= DECL_CONTEXT (olddecl
);
1743 memcpy ((char *) olddecl
+ sizeof (struct tree_common
),
1744 (char *) newdecl
+ sizeof (struct tree_common
),
1745 sizeof (struct tree_decl
) - sizeof (struct tree_common
));
1746 DECL_UID (olddecl
) = olddecl_uid
;
1747 DECL_CONTEXT (olddecl
) = olddecl_context
;
1750 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
1751 so that encode_section_info has a chance to look at the new decl
1752 flags and attributes. */
1753 if (DECL_RTL_SET_P (olddecl
)
1754 && (TREE_CODE (olddecl
) == FUNCTION_DECL
1755 || (TREE_CODE (olddecl
) == VAR_DECL
1756 && TREE_STATIC (olddecl
))))
1757 make_decl_rtl (olddecl
);
1760 /* Handle when a new declaration NEWDECL has the same name as an old
1761 one OLDDECL in the same binding contour. Prints an error message
1764 If safely possible, alter OLDDECL to look like NEWDECL, and return
1765 true. Otherwise, return false. */
1768 duplicate_decls (tree newdecl
, tree olddecl
)
1770 tree newtype
= NULL
, oldtype
= NULL
;
1772 if (!diagnose_mismatched_decls (newdecl
, olddecl
, &newtype
, &oldtype
))
1775 merge_decls (newdecl
, olddecl
, newtype
, oldtype
);
1780 /* Check whether decl-node NEW_DECL shadows an existing declaration. */
1782 warn_if_shadowing (tree new_decl
)
1784 struct c_binding
*b
;
1786 /* Shadow warnings wanted? */
1788 /* No shadow warnings for internally generated vars. */
1789 || DECL_IS_BUILTIN (new_decl
)
1790 /* No shadow warnings for vars made for inlining. */
1791 || DECL_FROM_INLINE (new_decl
)
1792 /* Don't warn about the parm names in function declarator
1793 within a function declarator. It would be nice to avoid
1794 warning in any function declarator in a declaration, as
1795 opposed to a definition, but there is no way to tell
1796 it's not a definition at this point. */
1797 || (TREE_CODE (new_decl
) == PARM_DECL
&& current_scope
->outer
->parm_flag
))
1800 /* Is anything being shadowed? Invisible decls do not count. */
1801 for (b
= I_SYMBOL_BINDING (DECL_NAME (new_decl
)); b
; b
= b
->shadowed
)
1802 if (b
->decl
&& b
->decl
!= new_decl
&& !b
->invisible
)
1804 tree old_decl
= b
->decl
;
1806 if (TREE_CODE (old_decl
) == PARM_DECL
)
1807 warning ("%Jdeclaration of %qD shadows a parameter",
1808 new_decl
, new_decl
);
1809 else if (DECL_FILE_SCOPE_P (old_decl
))
1810 warning ("%Jdeclaration of %qD shadows a global declaration",
1811 new_decl
, new_decl
);
1812 else if (TREE_CODE (old_decl
) == FUNCTION_DECL
1813 && DECL_BUILT_IN (old_decl
))
1814 warning ("%Jdeclaration of %qD shadows a built-in function",
1815 new_decl
, new_decl
);
1817 warning ("%Jdeclaration of %qD shadows a previous local",
1818 new_decl
, new_decl
);
1820 if (TREE_CODE (old_decl
) != FUNCTION_DECL
1821 || !DECL_BUILT_IN (old_decl
))
1822 warning ("%Jshadowed declaration is here", old_decl
);
1829 /* Subroutine of pushdecl.
1831 X is a TYPE_DECL for a typedef statement. Create a brand new
1832 ..._TYPE node (which will be just a variant of the existing
1833 ..._TYPE node with identical properties) and then install X
1834 as the TYPE_NAME of this brand new (duplicate) ..._TYPE node.
1836 The whole point here is to end up with a situation where each
1837 and every ..._TYPE node the compiler creates will be uniquely
1838 associated with AT MOST one node representing a typedef name.
1839 This way, even though the compiler substitutes corresponding
1840 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
1841 early on, later parts of the compiler can always do the reverse
1842 translation and get back the corresponding typedef name. For
1845 typedef struct S MY_TYPE;
1848 Later parts of the compiler might only know that `object' was of
1849 type `struct S' if it were not for code just below. With this
1850 code however, later parts of the compiler see something like:
1852 struct S' == struct S
1853 typedef struct S' MY_TYPE;
1856 And they can then deduce (from the node for type struct S') that
1857 the original object declaration was:
1861 Being able to do this is important for proper support of protoize,
1862 and also for generating precise symbolic debugging information
1863 which takes full account of the programmer's (typedef) vocabulary.
1865 Obviously, we don't want to generate a duplicate ..._TYPE node if
1866 the TYPE_DECL node that we are now processing really represents a
1867 standard built-in type.
1869 Since all standard types are effectively declared at line zero
1870 in the source file, we can easily check to see if we are working
1871 on a standard type by checking the current value of lineno. */
1874 clone_underlying_type (tree x
)
1876 if (DECL_IS_BUILTIN (x
))
1878 if (TYPE_NAME (TREE_TYPE (x
)) == 0)
1879 TYPE_NAME (TREE_TYPE (x
)) = x
;
1881 else if (TREE_TYPE (x
) != error_mark_node
1882 && DECL_ORIGINAL_TYPE (x
) == NULL_TREE
)
1884 tree tt
= TREE_TYPE (x
);
1885 DECL_ORIGINAL_TYPE (x
) = tt
;
1886 tt
= build_variant_type_copy (tt
);
1888 TREE_USED (tt
) = TREE_USED (x
);
1893 /* Record a decl-node X as belonging to the current lexical scope.
1894 Check for errors (such as an incompatible declaration for the same
1895 name already seen in the same scope).
1897 Returns either X or an old decl for the same name.
1898 If an old decl is returned, it may have been smashed
1899 to agree with what X says. */
1904 tree name
= DECL_NAME (x
);
1905 struct c_scope
*scope
= current_scope
;
1906 struct c_binding
*b
;
1907 bool nested
= false;
1909 /* Functions need the lang_decl data. */
1910 if (TREE_CODE (x
) == FUNCTION_DECL
&& !DECL_LANG_SPECIFIC (x
))
1911 DECL_LANG_SPECIFIC (x
) = GGC_CNEW (struct lang_decl
);
1913 /* Must set DECL_CONTEXT for everything not at file scope or
1914 DECL_FILE_SCOPE_P won't work. Local externs don't count
1915 unless they have initializers (which generate code). */
1916 if (current_function_decl
1917 && ((TREE_CODE (x
) != FUNCTION_DECL
&& TREE_CODE (x
) != VAR_DECL
)
1918 || DECL_INITIAL (x
) || !DECL_EXTERNAL (x
)))
1919 DECL_CONTEXT (x
) = current_function_decl
;
1921 /* Anonymous decls are just inserted in the scope. */
1924 bind (name
, x
, scope
, /*invisible=*/false, /*nested=*/false);
1928 /* First, see if there is another declaration with the same name in
1929 the current scope. If there is, duplicate_decls may do all the
1930 work for us. If duplicate_decls returns false, that indicates
1931 two incompatible decls in the same scope; we are to silently
1932 replace the old one (duplicate_decls has issued all appropriate
1933 diagnostics). In particular, we should not consider possible
1934 duplicates in the external scope, or shadowing. */
1935 b
= I_SYMBOL_BINDING (name
);
1936 if (b
&& B_IN_SCOPE (b
, scope
))
1938 if (TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
1939 && COMPLETE_TYPE_P (TREE_TYPE (x
)))
1940 b
->inner_comp
= false;
1941 if (duplicate_decls (x
, b
->decl
))
1944 goto skip_external_and_shadow_checks
;
1947 /* All declarations with external linkage, and all external
1948 references, go in the external scope, no matter what scope is
1949 current. However, the binding in that scope is ignored for
1950 purposes of normal name lookup. A separate binding structure is
1951 created in the requested scope; this governs the normal
1952 visibility of the symbol.
1954 The binding in the externals scope is used exclusively for
1955 detecting duplicate declarations of the same object, no matter
1956 what scope they are in; this is what we do here. (C99 6.2.7p2:
1957 All declarations that refer to the same object or function shall
1958 have compatible type; otherwise, the behavior is undefined.) */
1959 if (DECL_EXTERNAL (x
) || scope
== file_scope
)
1961 tree type
= TREE_TYPE (x
);
1964 bool type_saved
= false;
1965 if (b
&& !B_IN_EXTERNAL_SCOPE (b
)
1966 && (TREE_CODE (b
->decl
) == FUNCTION_DECL
1967 || TREE_CODE (b
->decl
) == VAR_DECL
)
1968 && DECL_FILE_SCOPE_P (b
->decl
))
1971 vistype
= TREE_TYPE (visdecl
);
1973 if (warn_nested_externs
1974 && scope
!= file_scope
1975 && !DECL_IN_SYSTEM_HEADER (x
))
1976 warning ("nested extern declaration of %qD", x
);
1978 while (b
&& !B_IN_EXTERNAL_SCOPE (b
))
1980 /* If this decl might be modified, save its type. This is
1981 done here rather than when the decl is first bound
1982 because the type may change after first binding, through
1983 being completed or through attributes being added. If we
1984 encounter multiple such decls, only the first should have
1985 its type saved; the others will already have had their
1986 proper types saved and the types will not have changed as
1987 their scopes will not have been re-entered. */
1988 if (DECL_FILE_SCOPE_P (b
->decl
) && !type_saved
)
1990 b
->type
= TREE_TYPE (b
->decl
);
1993 if (B_IN_FILE_SCOPE (b
)
1994 && TREE_CODE (b
->decl
) == VAR_DECL
1995 && TREE_STATIC (b
->decl
)
1996 && TREE_CODE (TREE_TYPE (b
->decl
)) == ARRAY_TYPE
1997 && !TYPE_DOMAIN (TREE_TYPE (b
->decl
))
1998 && TREE_CODE (type
) == ARRAY_TYPE
1999 && TYPE_DOMAIN (type
)
2000 && TYPE_MAX_VALUE (TYPE_DOMAIN (type
))
2001 && !integer_zerop (TYPE_MAX_VALUE (TYPE_DOMAIN (type
))))
2003 /* Array type completed in inner scope, which should be
2004 diagnosed if the completion does not have size 1 and
2005 it does not get completed in the file scope. */
2006 b
->inner_comp
= true;
2011 /* If a matching external declaration has been found, set its
2012 type to the composite of all the types of that declaration.
2013 After the consistency checks, it will be reset to the
2014 composite of the visible types only. */
2015 if (b
&& (TREE_PUBLIC (x
) || same_translation_unit_p (x
, b
->decl
))
2017 TREE_TYPE (b
->decl
) = b
->type
;
2019 /* The point of the same_translation_unit_p check here is,
2020 we want to detect a duplicate decl for a construct like
2021 foo() { extern bar(); } ... static bar(); but not if
2022 they are in different translation units. In any case,
2023 the static does not go in the externals scope. */
2025 && (TREE_PUBLIC (x
) || same_translation_unit_p (x
, b
->decl
))
2026 && duplicate_decls (x
, b
->decl
))
2029 thistype
= (vistype
? composite_type (vistype
, type
) : type
);
2030 b
->type
= TREE_TYPE (b
->decl
);
2031 if (TREE_CODE (b
->decl
) == FUNCTION_DECL
&& DECL_BUILT_IN (b
->decl
))
2033 = build_type_attribute_variant (thistype
,
2034 TYPE_ATTRIBUTES (b
->type
));
2035 TREE_TYPE (b
->decl
) = thistype
;
2036 bind (name
, b
->decl
, scope
, /*invisible=*/false, /*nested=*/true);
2039 else if (TREE_PUBLIC (x
))
2041 if (visdecl
&& !b
&& duplicate_decls (x
, visdecl
))
2043 /* An external declaration at block scope referring to a
2044 visible entity with internal linkage. The composite
2045 type will already be correct for this scope, so we
2046 just need to fall through to make the declaration in
2052 bind (name
, x
, external_scope
, /*invisible=*/true,
2058 /* Similarly, a declaration of a function with static linkage at
2059 block scope must be checked against any existing declaration
2060 of that function at file scope. */
2061 else if (TREE_CODE (x
) == FUNCTION_DECL
&& scope
!= file_scope
2062 && !TREE_PUBLIC (x
) && !DECL_INITIAL (x
))
2064 if (warn_nested_externs
&& !DECL_IN_SYSTEM_HEADER (x
))
2065 warning ("nested static declaration of %qD", x
);
2067 while (b
&& !B_IN_FILE_SCOPE (b
))
2070 if (b
&& same_translation_unit_p (x
, b
->decl
)
2071 && duplicate_decls (x
, b
->decl
))
2073 bind (name
, b
->decl
, scope
, /*invisible=*/false, /*nested=*/true);
2078 bind (name
, x
, file_scope
, /*invisible=*/true, /*nested=*/false);
2083 warn_if_shadowing (x
);
2085 skip_external_and_shadow_checks
:
2086 if (TREE_CODE (x
) == TYPE_DECL
)
2087 clone_underlying_type (x
);
2089 bind (name
, x
, scope
, /*invisible=*/false, nested
);
2091 /* If x's type is incomplete because it's based on a
2092 structure or union which has not yet been fully declared,
2093 attach it to that structure or union type, so we can go
2094 back and complete the variable declaration later, if the
2095 structure or union gets fully declared.
2097 If the input is erroneous, we can have error_mark in the type
2098 slot (e.g. "f(void a, ...)") - that doesn't count as an
2100 if (TREE_TYPE (x
) != error_mark_node
2101 && !COMPLETE_TYPE_P (TREE_TYPE (x
)))
2103 tree element
= TREE_TYPE (x
);
2105 while (TREE_CODE (element
) == ARRAY_TYPE
)
2106 element
= TREE_TYPE (element
);
2107 element
= TYPE_MAIN_VARIANT (element
);
2109 if ((TREE_CODE (element
) == RECORD_TYPE
2110 || TREE_CODE (element
) == UNION_TYPE
)
2111 && (TREE_CODE (x
) != TYPE_DECL
2112 || TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
)
2113 && !COMPLETE_TYPE_P (element
))
2114 C_TYPE_INCOMPLETE_VARS (element
)
2115 = tree_cons (NULL_TREE
, x
, C_TYPE_INCOMPLETE_VARS (element
));
2120 /* Record X as belonging to file scope.
2121 This is used only internally by the Objective-C front end,
2122 and is limited to its needs. duplicate_decls is not called;
2123 if there is any preexisting decl for this identifier, it is an ICE. */
2126 pushdecl_top_level (tree x
)
2129 bool nested
= false;
2131 gcc_assert (TREE_CODE (x
) == VAR_DECL
);
2133 name
= DECL_NAME (x
);
2135 gcc_assert (!I_SYMBOL_BINDING (name
));
2137 if (TREE_PUBLIC (x
))
2139 bind (name
, x
, external_scope
, /*invisible=*/true, /*nested=*/false);
2143 bind (name
, x
, file_scope
, /*invisible=*/false, nested
);
2149 implicit_decl_warning (tree id
, tree olddecl
)
2151 void (*diag
) (const char *, ...);
2152 switch (mesg_implicit_function_declaration
)
2155 case 1: diag
= warning
; break;
2156 case 2: diag
= error
; break;
2157 default: gcc_unreachable ();
2160 diag (N_("implicit declaration of function %qE"), id
);
2162 locate_old_decl (olddecl
, diag
);
2165 /* Generate an implicit declaration for identifier FUNCTIONID as a
2166 function of type int (). */
2169 implicitly_declare (tree functionid
)
2171 struct c_binding
*b
;
2175 for (b
= I_SYMBOL_BINDING (functionid
); b
; b
= b
->shadowed
)
2177 if (B_IN_SCOPE (b
, external_scope
))
2186 /* FIXME: Objective-C has weird not-really-builtin functions
2187 which are supposed to be visible automatically. They wind up
2188 in the external scope because they're pushed before the file
2189 scope gets created. Catch this here and rebind them into the
2191 if (!DECL_BUILT_IN (decl
) && DECL_IS_BUILTIN (decl
))
2193 bind (functionid
, decl
, file_scope
,
2194 /*invisible=*/false, /*nested=*/true);
2199 tree newtype
= default_function_type
;
2201 TREE_TYPE (decl
) = b
->type
;
2202 /* Implicit declaration of a function already declared
2203 (somehow) in a different scope, or as a built-in.
2204 If this is the first time this has happened, warn;
2205 then recycle the old declaration but with the new type. */
2206 if (!C_DECL_IMPLICIT (decl
))
2208 implicit_decl_warning (functionid
, decl
);
2209 C_DECL_IMPLICIT (decl
) = 1;
2211 if (DECL_BUILT_IN (decl
))
2213 newtype
= build_type_attribute_variant (newtype
,
2215 (TREE_TYPE (decl
)));
2216 if (!comptypes (newtype
, TREE_TYPE (decl
)))
2218 warning ("incompatible implicit declaration of built-in"
2219 " function %qD", decl
);
2220 newtype
= TREE_TYPE (decl
);
2225 if (!comptypes (newtype
, TREE_TYPE (decl
)))
2227 error ("incompatible implicit declaration of function %qD",
2229 locate_old_decl (decl
, error
);
2232 b
->type
= TREE_TYPE (decl
);
2233 TREE_TYPE (decl
) = newtype
;
2234 bind (functionid
, decl
, current_scope
,
2235 /*invisible=*/false, /*nested=*/true);
2240 /* Not seen before. */
2241 decl
= build_decl (FUNCTION_DECL
, functionid
, default_function_type
);
2242 DECL_EXTERNAL (decl
) = 1;
2243 TREE_PUBLIC (decl
) = 1;
2244 C_DECL_IMPLICIT (decl
) = 1;
2245 implicit_decl_warning (functionid
, 0);
2246 asmspec_tree
= maybe_apply_renaming_pragma (decl
, /*asmname=*/NULL
);
2248 set_user_assembler_name (decl
, TREE_STRING_POINTER (asmspec_tree
));
2250 /* C89 says implicit declarations are in the innermost block.
2251 So we record the decl in the standard fashion. */
2252 decl
= pushdecl (decl
);
2254 /* No need to call objc_check_decl here - it's a function type. */
2255 rest_of_decl_compilation (decl
, 0, 0);
2257 /* Write a record describing this implicit function declaration
2258 to the prototypes file (if requested). */
2259 gen_aux_info_record (decl
, 0, 1, 0);
2261 /* Possibly apply some default attributes to this implicit declaration. */
2262 decl_attributes (&decl
, NULL_TREE
, 0);
2267 /* Issue an error message for a reference to an undeclared variable
2268 ID, including a reference to a builtin outside of function-call
2269 context. Establish a binding of the identifier to error_mark_node
2270 in an appropriate scope, which will suppress further errors for the
2273 undeclared_variable (tree id
)
2275 static bool already
= false;
2276 struct c_scope
*scope
;
2278 if (current_function_decl
== 0)
2280 error ("%qE undeclared here (not in a function)", id
);
2281 scope
= current_scope
;
2285 error ("%qE undeclared (first use in this function)", id
);
2289 error ("(Each undeclared identifier is reported only once");
2290 error ("for each function it appears in.)");
2294 /* If we are parsing old-style parameter decls, current_function_decl
2295 will be nonnull but current_function_scope will be null. */
2296 scope
= current_function_scope
? current_function_scope
: current_scope
;
2298 bind (id
, error_mark_node
, scope
, /*invisible=*/false, /*nested=*/false);
2301 /* Subroutine of lookup_label, declare_label, define_label: construct a
2302 LABEL_DECL with all the proper frills. */
2305 make_label (tree name
, location_t location
)
2307 tree label
= build_decl (LABEL_DECL
, name
, void_type_node
);
2309 DECL_CONTEXT (label
) = current_function_decl
;
2310 DECL_MODE (label
) = VOIDmode
;
2311 DECL_SOURCE_LOCATION (label
) = location
;
2316 /* Get the LABEL_DECL corresponding to identifier NAME as a label.
2317 Create one if none exists so far for the current function.
2318 This is called when a label is used in a goto expression or
2319 has its address taken. */
2322 lookup_label (tree name
)
2326 if (current_function_decl
== 0)
2328 error ("label %qs referenced outside of any function",
2329 IDENTIFIER_POINTER (name
));
2333 /* Use a label already defined or ref'd with this name, but not if
2334 it is inherited from a containing function and wasn't declared
2336 label
= I_LABEL_DECL (name
);
2337 if (label
&& (DECL_CONTEXT (label
) == current_function_decl
2338 || C_DECLARED_LABEL_FLAG (label
)))
2340 /* If the label has only been declared, update its apparent
2341 location to point here, for better diagnostics if it
2342 turns out not to have been defined. */
2343 if (!TREE_USED (label
))
2344 DECL_SOURCE_LOCATION (label
) = input_location
;
2348 /* No label binding for that identifier; make one. */
2349 label
= make_label (name
, input_location
);
2351 /* Ordinary labels go in the current function scope. */
2352 bind (name
, label
, current_function_scope
,
2353 /*invisible=*/false, /*nested=*/false);
2357 /* Make a label named NAME in the current function, shadowing silently
2358 any that may be inherited from containing functions or containing
2359 scopes. This is called for __label__ declarations. */
2362 declare_label (tree name
)
2364 struct c_binding
*b
= I_LABEL_BINDING (name
);
2367 /* Check to make sure that the label hasn't already been declared
2369 if (b
&& B_IN_CURRENT_SCOPE (b
))
2371 error ("duplicate label declaration %qs", IDENTIFIER_POINTER (name
));
2372 locate_old_decl (b
->decl
, error
);
2374 /* Just use the previous declaration. */
2378 label
= make_label (name
, input_location
);
2379 C_DECLARED_LABEL_FLAG (label
) = 1;
2381 /* Declared labels go in the current scope. */
2382 bind (name
, label
, current_scope
,
2383 /*invisible=*/false, /*nested=*/false);
2387 /* Define a label, specifying the location in the source file.
2388 Return the LABEL_DECL node for the label, if the definition is valid.
2389 Otherwise return 0. */
2392 define_label (location_t location
, tree name
)
2394 /* Find any preexisting label with this name. It is an error
2395 if that label has already been defined in this function, or
2396 if there is a containing function with a declared label with
2398 tree label
= I_LABEL_DECL (name
);
2401 && ((DECL_CONTEXT (label
) == current_function_decl
2402 && DECL_INITIAL (label
) != 0)
2403 || (DECL_CONTEXT (label
) != current_function_decl
2404 && C_DECLARED_LABEL_FLAG (label
))))
2406 error ("%Hduplicate label %qD", &location
, label
);
2407 locate_old_decl (label
, error
);
2410 else if (label
&& DECL_CONTEXT (label
) == current_function_decl
)
2412 /* The label has been used or declared already in this function,
2413 but not defined. Update its location to point to this
2415 DECL_SOURCE_LOCATION (label
) = location
;
2419 /* No label binding for that identifier; make one. */
2420 label
= make_label (name
, location
);
2422 /* Ordinary labels go in the current function scope. */
2423 bind (name
, label
, current_function_scope
,
2424 /*invisible=*/false, /*nested=*/false);
2427 if (warn_traditional
&& !in_system_header
&& lookup_name (name
))
2428 warning ("%Htraditional C lacks a separate namespace for labels, "
2429 "identifier %qs conflicts", &location
,
2430 IDENTIFIER_POINTER (name
));
2432 /* Mark label as having been defined. */
2433 DECL_INITIAL (label
) = error_mark_node
;
2437 /* Given NAME, an IDENTIFIER_NODE,
2438 return the structure (or union or enum) definition for that name.
2439 If THISLEVEL_ONLY is nonzero, searches only the current_scope.
2440 CODE says which kind of type the caller wants;
2441 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2442 If the wrong kind of type is found, an error is reported. */
2445 lookup_tag (enum tree_code code
, tree name
, int thislevel_only
)
2447 struct c_binding
*b
= I_TAG_BINDING (name
);
2453 /* We only care about whether it's in this level if
2454 thislevel_only was set or it might be a type clash. */
2455 if (thislevel_only
|| TREE_CODE (b
->decl
) != code
)
2457 /* For our purposes, a tag in the external scope is the same as
2458 a tag in the file scope. (Primarily relevant to Objective-C
2459 and its builtin structure tags, which get pushed before the
2460 file scope is created.) */
2461 if (B_IN_CURRENT_SCOPE (b
)
2462 || (current_scope
== file_scope
&& B_IN_EXTERNAL_SCOPE (b
)))
2466 if (thislevel_only
&& !thislevel
)
2469 if (TREE_CODE (b
->decl
) != code
)
2471 /* Definition isn't the kind we were looking for. */
2472 pending_invalid_xref
= name
;
2473 pending_invalid_xref_location
= input_location
;
2475 /* If in the same binding level as a declaration as a tag
2476 of a different type, this must not be allowed to
2477 shadow that tag, so give the error immediately.
2478 (For example, "struct foo; union foo;" is invalid.) */
2480 pending_xref_error ();
2485 /* Print an error message now
2486 for a recent invalid struct, union or enum cross reference.
2487 We don't print them immediately because they are not invalid
2488 when used in the `struct foo;' construct for shadowing. */
2491 pending_xref_error (void)
2493 if (pending_invalid_xref
!= 0)
2494 error ("%H%qs defined as wrong kind of tag",
2495 &pending_invalid_xref_location
,
2496 IDENTIFIER_POINTER (pending_invalid_xref
));
2497 pending_invalid_xref
= 0;
2501 /* Look up NAME in the current scope and its superiors
2502 in the namespace of variables, functions and typedefs.
2503 Return a ..._DECL node of some kind representing its definition,
2504 or return 0 if it is undefined. */
2507 lookup_name (tree name
)
2509 struct c_binding
*b
= I_SYMBOL_BINDING (name
);
2510 if (b
&& !b
->invisible
)
2515 /* Similar to `lookup_name' but look only at the indicated scope. */
2518 lookup_name_in_scope (tree name
, struct c_scope
*scope
)
2520 struct c_binding
*b
;
2522 for (b
= I_SYMBOL_BINDING (name
); b
; b
= b
->shadowed
)
2523 if (B_IN_SCOPE (b
, scope
))
2528 /* Create the predefined scalar types of C,
2529 and some nodes representing standard constants (0, 1, (void *) 0).
2530 Initialize the global scope.
2531 Make definitions for built-in primitive functions. */
2534 c_init_decl_processing (void)
2537 tree ptr_ftype_void
, ptr_ftype_ptr
;
2538 location_t save_loc
= input_location
;
2540 /* Adds some ggc roots, and reserved words for c-parse.in. */
2543 current_function_decl
= 0;
2545 gcc_obstack_init (&parser_obstack
);
2547 /* Make the externals scope. */
2549 external_scope
= current_scope
;
2551 /* Declarations from c_common_nodes_and_builtins must not be associated
2552 with this input file, lest we get differences between using and not
2553 using preprocessed headers. */
2554 #ifdef USE_MAPPED_LOCATION
2555 input_location
= BUILTINS_LOCATION
;
2557 input_location
.file
= "<built-in>";
2558 input_location
.line
= 0;
2561 build_common_tree_nodes (flag_signed_char
, false);
2563 c_common_nodes_and_builtins ();
2565 /* In C, comparisons and TRUTH_* expressions have type int. */
2566 truthvalue_type_node
= integer_type_node
;
2567 truthvalue_true_node
= integer_one_node
;
2568 truthvalue_false_node
= integer_zero_node
;
2570 /* Even in C99, which has a real boolean type. */
2571 pushdecl (build_decl (TYPE_DECL
, get_identifier ("_Bool"),
2572 boolean_type_node
));
2574 endlink
= void_list_node
;
2575 ptr_ftype_void
= build_function_type (ptr_type_node
, endlink
);
2577 = build_function_type (ptr_type_node
,
2578 tree_cons (NULL_TREE
, ptr_type_node
, endlink
));
2580 input_location
= save_loc
;
2582 pedantic_lvalues
= true;
2584 make_fname_decl
= c_make_fname_decl
;
2585 start_fname_decls ();
2588 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
2589 decl, NAME is the initialization string and TYPE_DEP indicates whether
2590 NAME depended on the type of the function. As we don't yet implement
2591 delayed emission of static data, we mark the decl as emitted
2592 so it is not placed in the output. Anything using it must therefore pull
2593 out the STRING_CST initializer directly. FIXME. */
2596 c_make_fname_decl (tree id
, int type_dep
)
2598 const char *name
= fname_as_string (type_dep
);
2599 tree decl
, type
, init
;
2600 size_t length
= strlen (name
);
2602 type
= build_array_type
2603 (build_qualified_type (char_type_node
, TYPE_QUAL_CONST
),
2604 build_index_type (size_int (length
)));
2606 decl
= build_decl (VAR_DECL
, id
, type
);
2608 TREE_STATIC (decl
) = 1;
2609 TREE_READONLY (decl
) = 1;
2610 DECL_ARTIFICIAL (decl
) = 1;
2612 init
= build_string (length
+ 1, name
);
2613 free ((char *) name
);
2614 TREE_TYPE (init
) = type
;
2615 DECL_INITIAL (decl
) = init
;
2617 TREE_USED (decl
) = 1;
2619 if (current_function_decl
)
2621 DECL_CONTEXT (decl
) = current_function_decl
;
2622 bind (id
, decl
, current_function_scope
,
2623 /*invisible=*/false, /*nested=*/false);
2626 finish_decl (decl
, init
, NULL_TREE
);
2631 /* Return a definition for a builtin function named NAME and whose data type
2632 is TYPE. TYPE should be a function type with argument types.
2633 FUNCTION_CODE tells later passes how to compile calls to this function.
2634 See tree.h for its possible values.
2636 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
2637 the name to be called if we can't opencode the function. If
2638 ATTRS is nonzero, use that for the function's attribute list. */
2641 builtin_function (const char *name
, tree type
, int function_code
,
2642 enum built_in_class cl
, const char *library_name
,
2645 tree id
= get_identifier (name
);
2646 tree decl
= build_decl (FUNCTION_DECL
, id
, type
);
2647 TREE_PUBLIC (decl
) = 1;
2648 DECL_EXTERNAL (decl
) = 1;
2649 DECL_LANG_SPECIFIC (decl
) = GGC_CNEW (struct lang_decl
);
2650 DECL_BUILT_IN_CLASS (decl
) = cl
;
2651 DECL_FUNCTION_CODE (decl
) = function_code
;
2653 SET_DECL_ASSEMBLER_NAME (decl
, get_identifier (library_name
));
2655 /* Should never be called on a symbol with a preexisting meaning. */
2656 gcc_assert (!I_SYMBOL_BINDING (id
));
2658 bind (id
, decl
, external_scope
, /*invisible=*/true, /*nested=*/false);
2660 /* Builtins in the implementation namespace are made visible without
2661 needing to be explicitly declared. See push_file_scope. */
2662 if (name
[0] == '_' && (name
[1] == '_' || ISUPPER (name
[1])))
2664 TREE_CHAIN (decl
) = visible_builtins
;
2665 visible_builtins
= decl
;
2668 /* Possibly apply some default attributes to this built-in function. */
2670 decl_attributes (&decl
, attrs
, ATTR_FLAG_BUILT_IN
);
2672 decl_attributes (&decl
, NULL_TREE
, 0);
2677 /* Called when a declaration is seen that contains no names to declare.
2678 If its type is a reference to a structure, union or enum inherited
2679 from a containing scope, shadow that tag name for the current scope
2680 with a forward reference.
2681 If its type defines a new named structure or union
2682 or defines an enum, it is valid but we need not do anything here.
2683 Otherwise, it is an error. */
2686 shadow_tag (const struct c_declspecs
*declspecs
)
2688 shadow_tag_warned (declspecs
, 0);
2691 /* WARNED is 1 if we have done a pedwarn, 2 if we have done a warning,
2694 shadow_tag_warned (const struct c_declspecs
*declspecs
, int warned
)
2696 bool found_tag
= false;
2698 pending_invalid_xref
= 0;
2700 if (declspecs
->type
&& !declspecs
->default_int_p
&& !declspecs
->typedef_p
)
2702 tree value
= declspecs
->type
;
2703 enum tree_code code
= TREE_CODE (value
);
2705 if (code
== RECORD_TYPE
|| code
== UNION_TYPE
|| code
== ENUMERAL_TYPE
)
2706 /* Used to test also that TYPE_SIZE (value) != 0.
2707 That caused warning for `struct foo;' at top level in the file. */
2709 tree name
= TYPE_NAME (value
);
2716 if (warned
!= 1 && code
!= ENUMERAL_TYPE
)
2717 /* Empty unnamed enum OK */
2719 pedwarn ("unnamed struct/union that defines no instances");
2725 t
= lookup_tag (code
, name
, 1);
2729 t
= make_node (code
);
2736 if (warned
!= 1 && !in_system_header
)
2738 pedwarn ("useless type name in empty declaration");
2743 else if (warned
!= 1 && !in_system_header
&& declspecs
->typedef_p
)
2745 pedwarn ("useless type name in empty declaration");
2749 if (declspecs
->inline_p
)
2751 error ("%<inline%> in empty declaration");
2755 if (current_scope
== file_scope
&& declspecs
->storage_class
== csc_auto
)
2757 error ("%<auto%> in file-scope empty declaration");
2761 if (current_scope
== file_scope
&& declspecs
->storage_class
== csc_register
)
2763 error ("%<register%> in file-scope empty declaration");
2767 if (!warned
&& !in_system_header
&& declspecs
->storage_class
!= csc_none
)
2769 warning ("useless storage class specifier in empty declaration");
2773 if (!warned
&& !in_system_header
&& declspecs
->thread_p
)
2775 warning ("useless %<__thread%> in empty declaration");
2779 if (!warned
&& !in_system_header
&& (declspecs
->const_p
2780 || declspecs
->volatile_p
2781 || declspecs
->restrict_p
))
2783 warning ("useless type qualifier in empty declaration");
2790 pedwarn ("empty declaration");
2795 /* Return the qualifiers from SPECS as a bitwise OR of TYPE_QUAL_*
2796 bits. SPECS represents declaration specifiers that the grammar
2797 only permits to contain type qualifiers and attributes. */
2800 quals_from_declspecs (const struct c_declspecs
*specs
)
2802 int quals
= ((specs
->const_p
? TYPE_QUAL_CONST
: 0)
2803 | (specs
->volatile_p
? TYPE_QUAL_VOLATILE
: 0)
2804 | (specs
->restrict_p
? TYPE_QUAL_RESTRICT
: 0));
2805 gcc_assert (!specs
->type
2806 && !specs
->decl_attr
2807 && specs
->typespec_word
== cts_none
2808 && specs
->storage_class
== csc_none
2809 && !specs
->typedef_p
2810 && !specs
->explicit_signed_p
2811 && !specs
->deprecated_p
2813 && !specs
->long_long_p
2816 && !specs
->unsigned_p
2817 && !specs
->complex_p
2819 && !specs
->thread_p
);
2823 /* Construct an array declarator. EXPR is the expression inside [], or
2824 NULL_TREE. QUALS are the type qualifiers inside the [] (to be applied
2825 to the pointer to which a parameter array is converted). STATIC_P is
2826 true if "static" is inside the [], false otherwise. VLA_UNSPEC_P
2827 is true if the array is [*], a VLA of unspecified length which is
2828 nevertheless a complete type (not currently implemented by GCC),
2829 false otherwise. The field for the contained declarator is left to be
2830 filled in by set_array_declarator_inner. */
2832 struct c_declarator
*
2833 build_array_declarator (tree expr
, struct c_declspecs
*quals
, bool static_p
,
2836 struct c_declarator
*declarator
= XOBNEW (&parser_obstack
,
2837 struct c_declarator
);
2838 declarator
->kind
= cdk_array
;
2839 declarator
->declarator
= 0;
2840 declarator
->u
.array
.dimen
= expr
;
2843 declarator
->u
.array
.attrs
= quals
->attrs
;
2844 declarator
->u
.array
.quals
= quals_from_declspecs (quals
);
2848 declarator
->u
.array
.attrs
= NULL_TREE
;
2849 declarator
->u
.array
.quals
= 0;
2851 declarator
->u
.array
.static_p
= static_p
;
2852 declarator
->u
.array
.vla_unspec_p
= vla_unspec_p
;
2853 if (pedantic
&& !flag_isoc99
)
2855 if (static_p
|| quals
!= NULL
)
2856 pedwarn ("ISO C90 does not support %<static%> or type "
2857 "qualifiers in parameter array declarators");
2859 pedwarn ("ISO C90 does not support %<[*]%> array declarators");
2862 warning ("GCC does not yet properly implement %<[*]%> array declarators");
2866 /* Set the contained declarator of an array declarator. DECL is the
2867 declarator, as constructed by build_array_declarator; INNER is what
2868 appears on the left of the []. ABSTRACT_P is true if it is an
2869 abstract declarator, false otherwise; this is used to reject static
2870 and type qualifiers in abstract declarators, where they are not in
2871 the C99 grammar (subject to possible change in DR#289). */
2873 struct c_declarator
*
2874 set_array_declarator_inner (struct c_declarator
*decl
,
2875 struct c_declarator
*inner
, bool abstract_p
)
2877 decl
->declarator
= inner
;
2878 if (abstract_p
&& (decl
->u
.array
.quals
!= TYPE_UNQUALIFIED
2879 || decl
->u
.array
.attrs
!= NULL_TREE
2880 || decl
->u
.array
.static_p
))
2881 error ("static or type qualifiers in abstract declarator");
2885 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
2888 groktypename (struct c_type_name
*type_name
)
2891 tree attrs
= type_name
->specs
->attrs
;
2893 type_name
->specs
->attrs
= NULL_TREE
;
2895 type
= grokdeclarator (type_name
->declarator
, type_name
->specs
, TYPENAME
,
2898 /* Apply attributes. */
2899 decl_attributes (&type
, attrs
, 0);
2904 /* Decode a declarator in an ordinary declaration or data definition.
2905 This is called as soon as the type information and variable name
2906 have been parsed, before parsing the initializer if any.
2907 Here we create the ..._DECL node, fill in its type,
2908 and put it on the list of decls for the current context.
2909 The ..._DECL node is returned as the value.
2911 Exception: for arrays where the length is not specified,
2912 the type is left null, to be filled in by `finish_decl'.
2914 Function definitions do not come here; they go to start_function
2915 instead. However, external and forward declarations of functions
2916 do go through here. Structure field declarations are done by
2917 grokfield and not through here. */
2920 start_decl (struct c_declarator
*declarator
, struct c_declspecs
*declspecs
,
2921 bool initialized
, tree attributes
)
2926 /* An object declared as __attribute__((deprecated)) suppresses
2927 warnings of uses of other deprecated items. */
2928 if (lookup_attribute ("deprecated", attributes
))
2929 deprecated_state
= DEPRECATED_SUPPRESS
;
2931 decl
= grokdeclarator (declarator
, declspecs
,
2932 NORMAL
, initialized
, NULL
);
2934 deprecated_state
= DEPRECATED_NORMAL
;
2936 if (warn_main
> 0 && TREE_CODE (decl
) != FUNCTION_DECL
2937 && MAIN_NAME_P (DECL_NAME (decl
)))
2938 warning ("%J%qD is usually a function", decl
, decl
);
2941 /* Is it valid for this decl to have an initializer at all?
2942 If not, set INITIALIZED to zero, which will indirectly
2943 tell 'finish_decl' to ignore the initializer once it is parsed. */
2944 switch (TREE_CODE (decl
))
2947 error ("typedef %qD is initialized (use __typeof__ instead)", decl
);
2952 error ("function %qD is initialized like a variable", decl
);
2957 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
2958 error ("parameter %qD is initialized", decl
);
2963 /* Don't allow initializations for incomplete types except for
2964 arrays which might be completed by the initialization. */
2966 /* This can happen if the array size is an undefined macro.
2967 We already gave a warning, so we don't need another one. */
2968 if (TREE_TYPE (decl
) == error_mark_node
)
2970 else if (COMPLETE_TYPE_P (TREE_TYPE (decl
)))
2972 /* A complete type is ok if size is fixed. */
2974 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl
))) != INTEGER_CST
2975 || C_DECL_VARIABLE_SIZE (decl
))
2977 error ("variable-sized object may not be initialized");
2981 else if (TREE_CODE (TREE_TYPE (decl
)) != ARRAY_TYPE
)
2983 error ("variable %qD has initializer but incomplete type", decl
);
2986 else if (!COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (decl
))))
2988 error ("elements of array %qD have incomplete type", decl
);
2991 else if (C_DECL_VARIABLE_SIZE (decl
))
2993 /* Although C99 is unclear about whether incomplete arrays
2994 of VLAs themselves count as VLAs, it does not make
2995 sense to permit them to be initialized given that
2996 ordinary VLAs may not be initialized. */
2997 error ("variable-sized object may not be initialized");
3004 if (current_scope
== file_scope
)
3005 TREE_STATIC (decl
) = 1;
3007 /* Tell 'pushdecl' this is an initialized decl
3008 even though we don't yet have the initializer expression.
3009 Also tell 'finish_decl' it may store the real initializer. */
3010 DECL_INITIAL (decl
) = error_mark_node
;
3013 /* If this is a function declaration, write a record describing it to the
3014 prototypes file (if requested). */
3016 if (TREE_CODE (decl
) == FUNCTION_DECL
)
3017 gen_aux_info_record (decl
, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl
)) != 0);
3019 /* ANSI specifies that a tentative definition which is not merged with
3020 a non-tentative definition behaves exactly like a definition with an
3021 initializer equal to zero. (Section 3.7.2)
3023 -fno-common gives strict ANSI behavior, though this tends to break
3024 a large body of code that grew up without this rule.
3026 Thread-local variables are never common, since there's no entrenched
3027 body of code to break, and it allows more efficient variable references
3028 in the presence of dynamic linking. */
3030 if (TREE_CODE (decl
) == VAR_DECL
3032 && TREE_PUBLIC (decl
)
3033 && !DECL_THREAD_LOCAL (decl
)
3035 DECL_COMMON (decl
) = 1;
3037 /* Set attributes here so if duplicate decl, will have proper attributes. */
3038 decl_attributes (&decl
, attributes
, 0);
3040 if (TREE_CODE (decl
) == FUNCTION_DECL
3041 && targetm
.calls
.promote_prototypes (TREE_TYPE (decl
)))
3043 struct c_declarator
*ce
= declarator
;
3045 if (ce
->kind
== cdk_pointer
)
3046 ce
= declarator
->declarator
;
3047 if (ce
->kind
== cdk_function
)
3049 tree args
= ce
->u
.arg_info
->parms
;
3050 for (; args
; args
= TREE_CHAIN (args
))
3052 tree type
= TREE_TYPE (args
);
3053 if (type
&& INTEGRAL_TYPE_P (type
)
3054 && TYPE_PRECISION (type
) < TYPE_PRECISION (integer_type_node
))
3055 DECL_ARG_TYPE (args
) = integer_type_node
;
3060 if (TREE_CODE (decl
) == FUNCTION_DECL
3061 && DECL_DECLARED_INLINE_P (decl
)
3062 && DECL_UNINLINABLE (decl
)
3063 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl
)))
3064 warning ("%Jinline function %qD given attribute noinline", decl
, decl
);
3066 /* Add this decl to the current scope.
3067 TEM may equal DECL or it may be a previous decl of the same name. */
3068 tem
= pushdecl (decl
);
3070 if (initialized
&& DECL_EXTERNAL (tem
))
3072 DECL_EXTERNAL (tem
) = 0;
3073 TREE_STATIC (tem
) = 1;
3079 /* Finish processing of a declaration;
3080 install its initial value.
3081 If the length of an array type is not known before,
3082 it must be determined now, from the initial value, or it is an error. */
3085 finish_decl (tree decl
, tree init
, tree asmspec_tree
)
3087 tree type
= TREE_TYPE (decl
);
3088 int was_incomplete
= (DECL_SIZE (decl
) == 0);
3089 const char *asmspec
= 0;
3091 /* If a name was specified, get the string. */
3092 if ((TREE_CODE (decl
) == FUNCTION_DECL
|| TREE_CODE (decl
) == VAR_DECL
)
3093 && DECL_FILE_SCOPE_P (decl
))
3094 asmspec_tree
= maybe_apply_renaming_pragma (decl
, asmspec_tree
);
3096 asmspec
= TREE_STRING_POINTER (asmspec_tree
);
3098 /* If `start_decl' didn't like having an initialization, ignore it now. */
3099 if (init
!= 0 && DECL_INITIAL (decl
) == 0)
3102 /* Don't crash if parm is initialized. */
3103 if (TREE_CODE (decl
) == PARM_DECL
)
3107 store_init_value (decl
, init
);
3109 if (c_dialect_objc () && (TREE_CODE (decl
) == VAR_DECL
3110 || TREE_CODE (decl
) == FUNCTION_DECL
3111 || TREE_CODE (decl
) == FIELD_DECL
))
3112 objc_check_decl (decl
);
3114 /* Deduce size of array from initialization, if not already known. */
3115 if (TREE_CODE (type
) == ARRAY_TYPE
3116 && TYPE_DOMAIN (type
) == 0
3117 && TREE_CODE (decl
) != TYPE_DECL
)
3120 = (TREE_STATIC (decl
)
3121 /* Even if pedantic, an external linkage array
3122 may have incomplete type at first. */
3123 ? pedantic
&& !TREE_PUBLIC (decl
)
3124 : !DECL_EXTERNAL (decl
));
3126 = complete_array_type (type
, DECL_INITIAL (decl
), do_default
);
3128 /* Get the completed type made by complete_array_type. */
3129 type
= TREE_TYPE (decl
);
3132 error ("%Jinitializer fails to determine size of %qD", decl
, decl
);
3134 else if (failure
== 2)
3137 error ("%Jarray size missing in %qD", decl
, decl
);
3138 /* If a `static' var's size isn't known,
3139 make it extern as well as static, so it does not get
3141 If it is not `static', then do not mark extern;
3142 finish_incomplete_decl will give it a default size
3143 and it will get allocated. */
3144 else if (!pedantic
&& TREE_STATIC (decl
) && !TREE_PUBLIC (decl
))
3145 DECL_EXTERNAL (decl
) = 1;
3148 /* TYPE_MAX_VALUE is always one less than the number of elements
3149 in the array, because we start counting at zero. Therefore,
3150 warn only if the value is less than zero. */
3151 else if (pedantic
&& TYPE_DOMAIN (type
) != 0
3152 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type
))) < 0)
3153 error ("%Jzero or negative size array %qD", decl
, decl
);
3155 layout_decl (decl
, 0);
3158 if (TREE_CODE (decl
) == VAR_DECL
)
3160 if (DECL_SIZE (decl
) == 0 && TREE_TYPE (decl
) != error_mark_node
3161 && COMPLETE_TYPE_P (TREE_TYPE (decl
)))
3162 layout_decl (decl
, 0);
3164 if (DECL_SIZE (decl
) == 0
3165 /* Don't give an error if we already gave one earlier. */
3166 && TREE_TYPE (decl
) != error_mark_node
3167 && (TREE_STATIC (decl
)
3168 /* A static variable with an incomplete type
3169 is an error if it is initialized.
3170 Also if it is not file scope.
3171 Otherwise, let it through, but if it is not `extern'
3172 then it may cause an error message later. */
3173 ? (DECL_INITIAL (decl
) != 0
3174 || !DECL_FILE_SCOPE_P (decl
))
3175 /* An automatic variable with an incomplete type
3177 : !DECL_EXTERNAL (decl
)))
3179 error ("%Jstorage size of %qD isn%'t known", decl
, decl
);
3180 TREE_TYPE (decl
) = error_mark_node
;
3183 if ((DECL_EXTERNAL (decl
) || TREE_STATIC (decl
))
3184 && DECL_SIZE (decl
) != 0)
3186 if (TREE_CODE (DECL_SIZE (decl
)) == INTEGER_CST
)
3187 constant_expression_warning (DECL_SIZE (decl
));
3189 error ("%Jstorage size of %qD isn%'t constant", decl
, decl
);
3192 if (TREE_USED (type
))
3193 TREE_USED (decl
) = 1;
3196 /* If this is a function and an assembler name is specified, reset DECL_RTL
3197 so we can give it its new name. Also, update built_in_decls if it
3198 was a normal built-in. */
3199 if (TREE_CODE (decl
) == FUNCTION_DECL
&& asmspec
)
3201 if (DECL_BUILT_IN_CLASS (decl
) == BUILT_IN_NORMAL
)
3203 tree builtin
= built_in_decls
[DECL_FUNCTION_CODE (decl
)];
3204 set_user_assembler_name (builtin
, asmspec
);
3205 if (DECL_FUNCTION_CODE (decl
) == BUILT_IN_MEMCPY
)
3206 init_block_move_fn (asmspec
);
3207 else if (DECL_FUNCTION_CODE (decl
) == BUILT_IN_MEMSET
)
3208 init_block_clear_fn (asmspec
);
3210 set_user_assembler_name (decl
, asmspec
);
3213 /* If #pragma weak was used, mark the decl weak now. */
3214 if (current_scope
== file_scope
)
3215 maybe_apply_pragma_weak (decl
);
3217 /* If this is a variable definition, determine its ELF visibility. */
3218 if (TREE_CODE (decl
) == VAR_DECL
3219 && TREE_STATIC (decl
)
3220 && !DECL_EXTERNAL (decl
))
3221 c_determine_visibility (decl
);
3223 /* Output the assembler code and/or RTL code for variables and functions,
3224 unless the type is an undefined structure or union.
3225 If not, it will get done when the type is completed. */
3227 if (TREE_CODE (decl
) == VAR_DECL
|| TREE_CODE (decl
) == FUNCTION_DECL
)
3229 /* This is a no-op in c-lang.c or something real in objc-act.c. */
3230 if (c_dialect_objc ())
3231 objc_check_decl (decl
);
3235 /* If this is not a static variable, issue a warning.
3236 It doesn't make any sense to give an ASMSPEC for an
3237 ordinary, non-register local variable. Historically,
3238 GCC has accepted -- but ignored -- the ASMSPEC in
3240 if (!DECL_FILE_SCOPE_P (decl
)
3241 && TREE_CODE (decl
) == VAR_DECL
3242 && !C_DECL_REGISTER (decl
)
3243 && !TREE_STATIC (decl
))
3244 warning ("%Jignoring asm-specifier for non-static local "
3245 "variable %qD", decl
, decl
);
3246 else if (C_DECL_REGISTER (decl
))
3247 change_decl_assembler_name (decl
, get_identifier (asmspec
));
3249 set_user_assembler_name (decl
, asmspec
);
3252 if (DECL_FILE_SCOPE_P (decl
))
3254 if (DECL_INITIAL (decl
) == NULL_TREE
3255 || DECL_INITIAL (decl
) == error_mark_node
)
3256 /* Don't output anything
3257 when a tentative file-scope definition is seen.
3258 But at end of compilation, do output code for them. */
3259 DECL_DEFER_OUTPUT (decl
) = 1;
3260 rest_of_decl_compilation (decl
, true, 0);
3264 /* In conjunction with an ASMSPEC, the `register'
3265 keyword indicates that we should place the variable
3266 in a particular register. */
3267 if (asmspec
&& C_DECL_REGISTER (decl
))
3269 DECL_HARD_REGISTER (decl
) = 1;
3270 /* This cannot be done for a structure with volatile
3271 fields, on which DECL_REGISTER will have been
3273 if (!DECL_REGISTER (decl
))
3274 error ("cannot put object with volatile field into register");
3277 if (TREE_CODE (decl
) != FUNCTION_DECL
)
3279 /* If we're building a variable sized type, and we might be
3280 reachable other than via the top of the current binding
3281 level, then create a new BIND_EXPR so that we deallocate
3282 the object at the right time. */
3283 /* Note that DECL_SIZE can be null due to errors. */
3284 if (DECL_SIZE (decl
)
3285 && !TREE_CONSTANT (DECL_SIZE (decl
))
3286 && STATEMENT_LIST_HAS_LABEL (cur_stmt_list
))
3289 bind
= build3 (BIND_EXPR
, void_type_node
, NULL
, NULL
, NULL
);
3290 TREE_SIDE_EFFECTS (bind
) = 1;
3292 BIND_EXPR_BODY (bind
) = push_stmt_list ();
3294 add_stmt (build_stmt (DECL_EXPR
, decl
));
3299 if (!DECL_FILE_SCOPE_P (decl
))
3301 /* Recompute the RTL of a local array now
3302 if it used to be an incomplete type. */
3304 && !TREE_STATIC (decl
) && !DECL_EXTERNAL (decl
))
3306 /* If we used it already as memory, it must stay in memory. */
3307 TREE_ADDRESSABLE (decl
) = TREE_USED (decl
);
3308 /* If it's still incomplete now, no init will save it. */
3309 if (DECL_SIZE (decl
) == 0)
3310 DECL_INITIAL (decl
) = 0;
3315 /* If this was marked 'used', be sure it will be output. */
3316 if (lookup_attribute ("used", DECL_ATTRIBUTES (decl
)))
3317 mark_decl_referenced (decl
);
3319 if (TREE_CODE (decl
) == TYPE_DECL
)
3321 if (!DECL_FILE_SCOPE_P (decl
)
3322 && variably_modified_type_p (TREE_TYPE (decl
), NULL_TREE
))
3323 add_stmt (build_stmt (DECL_EXPR
, decl
));
3325 rest_of_decl_compilation (decl
, DECL_FILE_SCOPE_P (decl
), 0);
3328 /* At the end of a declaration, throw away any variable type sizes
3329 of types defined inside that declaration. There is no use
3330 computing them in the following function definition. */
3331 if (current_scope
== file_scope
)
3332 get_pending_sizes ();
3334 /* Install a cleanup (aka destructor) if one was given. */
3335 if (TREE_CODE (decl
) == VAR_DECL
&& !TREE_STATIC (decl
))
3337 tree attr
= lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl
));
3340 tree cleanup_id
= TREE_VALUE (TREE_VALUE (attr
));
3341 tree cleanup_decl
= lookup_name (cleanup_id
);
3344 /* Build "cleanup(&decl)" for the destructor. */
3345 cleanup
= build_unary_op (ADDR_EXPR
, decl
, 0);
3346 cleanup
= build_tree_list (NULL_TREE
, cleanup
);
3347 cleanup
= build_function_call (cleanup_decl
, cleanup
);
3349 /* Don't warn about decl unused; the cleanup uses it. */
3350 TREE_USED (decl
) = 1;
3351 TREE_USED (cleanup_decl
) = 1;
3353 /* Initialize EH, if we've been told to do so. */
3354 if (flag_exceptions
&& !c_eh_initialized_p
)
3356 c_eh_initialized_p
= true;
3357 eh_personality_libfunc
3358 = init_one_libfunc (USING_SJLJ_EXCEPTIONS
3359 ? "__gcc_personality_sj0"
3360 : "__gcc_personality_v0");
3361 using_eh_for_cleanups ();
3364 push_cleanup (decl
, cleanup
, false);
3369 /* Given a parsed parameter declaration, decode it into a PARM_DECL. */
3372 grokparm (const struct c_parm
*parm
)
3374 tree decl
= grokdeclarator (parm
->declarator
, parm
->specs
, PARM
, false,
3377 decl_attributes (&decl
, parm
->attrs
, 0);
3382 /* Given a parsed parameter declaration, decode it into a PARM_DECL
3383 and push that on the current scope. */
3386 push_parm_decl (const struct c_parm
*parm
)
3390 decl
= grokdeclarator (parm
->declarator
, parm
->specs
, PARM
, false, NULL
);
3391 decl_attributes (&decl
, parm
->attrs
, 0);
3393 decl
= pushdecl (decl
);
3395 finish_decl (decl
, NULL_TREE
, NULL_TREE
);
3398 /* Mark all the parameter declarations to date as forward decls.
3399 Also diagnose use of this extension. */
3402 mark_forward_parm_decls (void)
3404 struct c_binding
*b
;
3406 if (pedantic
&& !current_scope
->warned_forward_parm_decls
)
3408 pedwarn ("ISO C forbids forward parameter declarations");
3409 current_scope
->warned_forward_parm_decls
= true;
3412 for (b
= current_scope
->bindings
; b
; b
= b
->prev
)
3413 if (TREE_CODE (b
->decl
) == PARM_DECL
)
3414 TREE_ASM_WRITTEN (b
->decl
) = 1;
3417 static GTY(()) int compound_literal_number
;
3419 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
3420 literal, which may be an incomplete array type completed by the
3421 initializer; INIT is a CONSTRUCTOR that initializes the compound
3425 build_compound_literal (tree type
, tree init
)
3427 /* We do not use start_decl here because we have a type, not a declarator;
3428 and do not use finish_decl because the decl should be stored inside
3429 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_EXPR. */
3434 if (type
== error_mark_node
)
3435 return error_mark_node
;
3437 decl
= build_decl (VAR_DECL
, NULL_TREE
, type
);
3438 DECL_EXTERNAL (decl
) = 0;
3439 TREE_PUBLIC (decl
) = 0;
3440 TREE_STATIC (decl
) = (current_scope
== file_scope
);
3441 DECL_CONTEXT (decl
) = current_function_decl
;
3442 TREE_USED (decl
) = 1;
3443 TREE_TYPE (decl
) = type
;
3444 TREE_READONLY (decl
) = TYPE_READONLY (type
);
3445 store_init_value (decl
, init
);
3447 if (TREE_CODE (type
) == ARRAY_TYPE
&& !COMPLETE_TYPE_P (type
))
3449 int failure
= complete_array_type (type
, DECL_INITIAL (decl
), 1);
3451 gcc_assert (!failure
);
3454 type
= TREE_TYPE (decl
);
3455 if (type
== error_mark_node
|| !COMPLETE_TYPE_P (type
))
3456 return error_mark_node
;
3458 stmt
= build_stmt (DECL_EXPR
, decl
);
3459 complit
= build1 (COMPOUND_LITERAL_EXPR
, TREE_TYPE (decl
), stmt
);
3460 TREE_SIDE_EFFECTS (complit
) = 1;
3462 layout_decl (decl
, 0);
3464 if (TREE_STATIC (decl
))
3466 /* This decl needs a name for the assembler output. We also need
3467 a unique suffix to be added to the name. */
3470 ASM_FORMAT_PRIVATE_NAME (name
, "__compound_literal",
3471 compound_literal_number
);
3472 compound_literal_number
++;
3473 DECL_NAME (decl
) = get_identifier (name
);
3474 DECL_DEFER_OUTPUT (decl
) = 1;
3475 DECL_COMDAT (decl
) = 1;
3476 DECL_ARTIFICIAL (decl
) = 1;
3478 rest_of_decl_compilation (decl
, 1, 0);
3484 /* Make TYPE a complete type based on INITIAL_VALUE.
3485 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3486 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3489 complete_array_type (tree type
, tree initial_value
, int do_default
)
3491 tree maxindex
= NULL_TREE
;
3496 /* Note MAXINDEX is really the maximum index,
3497 one less than the size. */
3498 if (TREE_CODE (initial_value
) == STRING_CST
)
3501 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value
)));
3502 maxindex
= build_int_cst (NULL_TREE
,
3503 (TREE_STRING_LENGTH (initial_value
)
3506 else if (TREE_CODE (initial_value
) == CONSTRUCTOR
)
3508 tree elts
= CONSTRUCTOR_ELTS (initial_value
);
3509 maxindex
= build_int_cst (NULL_TREE
, -1);
3510 for (; elts
; elts
= TREE_CHAIN (elts
))
3512 if (TREE_PURPOSE (elts
))
3513 maxindex
= TREE_PURPOSE (elts
);
3515 maxindex
= fold (build2 (PLUS_EXPR
, integer_type_node
,
3516 maxindex
, integer_one_node
));
3521 /* Make an error message unless that happened already. */
3522 if (initial_value
!= error_mark_node
)
3525 /* Prevent further error messages. */
3526 maxindex
= build_int_cst (NULL_TREE
, 0);
3533 maxindex
= build_int_cst (NULL_TREE
, 0);
3539 TYPE_DOMAIN (type
) = build_index_type (maxindex
);
3541 gcc_assert (TREE_TYPE (maxindex
));
3544 /* Lay out the type now that we can get the real answer. */
3551 /* Determine whether TYPE is a structure with a flexible array member,
3552 or a union containing such a structure (possibly recursively). */
3555 flexible_array_type_p (tree type
)
3558 switch (TREE_CODE (type
))
3561 x
= TYPE_FIELDS (type
);
3564 while (TREE_CHAIN (x
) != NULL_TREE
)
3566 if (TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
3567 && TYPE_SIZE (TREE_TYPE (x
)) == NULL_TREE
3568 && TYPE_DOMAIN (TREE_TYPE (x
)) != NULL_TREE
3569 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x
))) == NULL_TREE
)
3573 for (x
= TYPE_FIELDS (type
); x
!= NULL_TREE
; x
= TREE_CHAIN (x
))
3575 if (flexible_array_type_p (TREE_TYPE (x
)))
3584 /* Performs sanity checks on the TYPE and WIDTH of the bit-field NAME,
3585 replacing with appropriate values if they are invalid. */
3587 check_bitfield_type_and_width (tree
*type
, tree
*width
, const char *orig_name
)
3590 unsigned int max_width
;
3591 unsigned HOST_WIDE_INT w
;
3592 const char *name
= orig_name
? orig_name
: _("<anonymous>");
3595 STRIP_NOPS (*width
);
3597 /* Detect and ignore out of range field width and process valid
3599 if (TREE_CODE (*width
) != INTEGER_CST
)
3601 error ("bit-field %qs width not an integer constant", name
);
3602 *width
= integer_one_node
;
3606 constant_expression_warning (*width
);
3607 if (tree_int_cst_sgn (*width
) < 0)
3609 error ("negative width in bit-field %qs", name
);
3610 *width
= integer_one_node
;
3612 else if (integer_zerop (*width
) && orig_name
)
3614 error ("zero width for bit-field %qs", name
);
3615 *width
= integer_one_node
;
3619 /* Detect invalid bit-field type. */
3620 if (TREE_CODE (*type
) != INTEGER_TYPE
3621 && TREE_CODE (*type
) != BOOLEAN_TYPE
3622 && TREE_CODE (*type
) != ENUMERAL_TYPE
)
3624 error ("bit-field %qs has invalid type", name
);
3625 *type
= unsigned_type_node
;
3628 type_mv
= TYPE_MAIN_VARIANT (*type
);
3630 && type_mv
!= integer_type_node
3631 && type_mv
!= unsigned_type_node
3632 && type_mv
!= boolean_type_node
)
3633 pedwarn ("type of bit-field %qs is a GCC extension", name
);
3635 if (type_mv
== boolean_type_node
)
3636 max_width
= CHAR_TYPE_SIZE
;
3638 max_width
= TYPE_PRECISION (*type
);
3640 if (0 < compare_tree_int (*width
, max_width
))
3642 error ("width of %qs exceeds its type", name
);
3644 *width
= build_int_cst (NULL_TREE
, w
);
3647 w
= tree_low_cst (*width
, 1);
3649 if (TREE_CODE (*type
) == ENUMERAL_TYPE
)
3651 struct lang_type
*lt
= TYPE_LANG_SPECIFIC (*type
);
3653 || w
< min_precision (lt
->enum_min
, TYPE_UNSIGNED (*type
))
3654 || w
< min_precision (lt
->enum_max
, TYPE_UNSIGNED (*type
)))
3655 warning ("%qs is narrower than values of its type", name
);
3659 /* Given declspecs and a declarator,
3660 determine the name and type of the object declared
3661 and construct a ..._DECL node for it.
3662 (In one case we can return a ..._TYPE node instead.
3663 For invalid input we sometimes return 0.)
3665 DECLSPECS is a c_declspecs structure for the declaration specifiers.
3667 DECL_CONTEXT says which syntactic context this declaration is in:
3668 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3669 FUNCDEF for a function definition. Like NORMAL but a few different
3670 error messages in each case. Return value may be zero meaning
3671 this definition is too screwy to try to parse.
3672 PARM for a parameter declaration (either within a function prototype
3673 or before a function body). Make a PARM_DECL, or return void_type_node.
3674 TYPENAME if for a typename (in a cast or sizeof).
3675 Don't make a DECL node; just return the ..._TYPE node.
3676 FIELD for a struct or union field; make a FIELD_DECL.
3677 INITIALIZED is true if the decl has an initializer.
3678 WIDTH is non-NULL for bit-fields, and is a pointer to an INTEGER_CST node
3679 representing the width of the bit-field.
3681 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3682 It may also be so in the PARM case, for a prototype where the
3683 argument type is specified but not the name.
3685 This function is where the complicated C meanings of `static'
3686 and `extern' are interpreted. */
3689 grokdeclarator (const struct c_declarator
*declarator
,
3690 struct c_declspecs
*declspecs
,
3691 enum decl_context decl_context
, bool initialized
, tree
*width
)
3693 tree type
= declspecs
->type
;
3694 bool threadp
= declspecs
->thread_p
;
3695 enum c_storage_class storage_class
= declspecs
->storage_class
;
3699 int type_quals
= TYPE_UNQUALIFIED
;
3700 const char *name
, *orig_name
;
3701 tree typedef_type
= 0;
3702 int funcdef_flag
= 0;
3703 bool funcdef_syntax
= false;
3704 int size_varies
= 0;
3705 tree decl_attr
= declspecs
->decl_attr
;
3706 int array_ptr_quals
= TYPE_UNQUALIFIED
;
3707 tree array_ptr_attrs
= NULL_TREE
;
3708 int array_parm_static
= 0;
3709 tree returned_attrs
= NULL_TREE
;
3710 bool bitfield
= width
!= NULL
;
3712 struct c_arg_info
*arg_info
= 0;
3714 if (decl_context
== FUNCDEF
)
3715 funcdef_flag
= 1, decl_context
= NORMAL
;
3717 /* Look inside a declarator for the name being declared
3718 and get it as a string, for an error message. */
3720 const struct c_declarator
*decl
= declarator
;
3729 funcdef_syntax
= (decl
->kind
== cdk_function
);
3730 decl
= decl
->declarator
;
3734 decl
= decl
->declarator
;
3739 name
= IDENTIFIER_POINTER (decl
->u
.id
);
3751 /* A function definition's declarator must have the form of
3752 a function declarator. */
3754 if (funcdef_flag
&& !funcdef_syntax
)
3757 /* If this looks like a function definition, make it one,
3758 even if it occurs where parms are expected.
3759 Then store_parm_decls will reject it and not use it as a parm. */
3760 if (decl_context
== NORMAL
&& !funcdef_flag
&& current_scope
->parm_flag
)
3761 decl_context
= PARM
;
3763 if (declspecs
->deprecated_p
&& deprecated_state
!= DEPRECATED_SUPPRESS
)
3764 warn_deprecated_use (declspecs
->type
);
3766 typedef_type
= type
;
3767 size_varies
= C_TYPE_VARIABLE_SIZE (type
);
3769 /* Diagnose defaulting to "int". */
3771 if (declspecs
->default_int_p
&& !in_system_header
)
3773 /* Issue a warning if this is an ISO C 99 program or if
3774 -Wreturn-type and this is a function, or if -Wimplicit;
3775 prefer the former warning since it is more explicit. */
3776 if ((warn_implicit_int
|| warn_return_type
|| flag_isoc99
)
3778 warn_about_return_type
= 1;
3779 else if (warn_implicit_int
|| flag_isoc99
)
3780 pedwarn_c99 ("type defaults to %<int%> in declaration of %qs", name
);
3783 /* Adjust the type if a bit-field is being declared,
3784 -funsigned-bitfields applied and the type is not explicitly
3786 if (bitfield
&& !flag_signed_bitfields
&& !declspecs
->explicit_signed_p
3787 && TREE_CODE (type
) == INTEGER_TYPE
)
3788 type
= c_common_unsigned_type (type
);
3790 /* Check the type and width of a bit-field. */
3792 check_bitfield_type_and_width (&type
, width
, orig_name
);
3794 /* Figure out the type qualifiers for the declaration. There are
3795 two ways a declaration can become qualified. One is something
3796 like `const int i' where the `const' is explicit. Another is
3797 something like `typedef const int CI; CI i' where the type of the
3798 declaration contains the `const'. A third possibility is that
3799 there is a type qualifier on the element type of a typedefed
3800 array type, in which case we should extract that qualifier so
3801 that c_apply_type_quals_to_decls receives the full list of
3802 qualifiers to work with (C90 is not entirely clear about whether
3803 duplicate qualifiers should be diagnosed in this case, but it
3804 seems most appropriate to do so). */
3805 element_type
= strip_array_types (type
);
3806 constp
= declspecs
->const_p
+ TYPE_READONLY (element_type
);
3807 restrictp
= declspecs
->restrict_p
+ TYPE_RESTRICT (element_type
);
3808 volatilep
= declspecs
->volatile_p
+ TYPE_VOLATILE (element_type
);
3809 if (pedantic
&& !flag_isoc99
)
3812 pedwarn ("duplicate %<const%>");
3814 pedwarn ("duplicate %<restrict%>");
3816 pedwarn ("duplicate %<volatile%>");
3818 if (!flag_gen_aux_info
&& (TYPE_QUALS (type
)))
3819 type
= TYPE_MAIN_VARIANT (type
);
3820 type_quals
= ((constp
? TYPE_QUAL_CONST
: 0)
3821 | (restrictp
? TYPE_QUAL_RESTRICT
: 0)
3822 | (volatilep
? TYPE_QUAL_VOLATILE
: 0));
3824 /* Warn about storage classes that are invalid for certain
3825 kinds of declarations (parameters, typenames, etc.). */
3829 || storage_class
== csc_auto
3830 || storage_class
== csc_register
3831 || storage_class
== csc_typedef
))
3833 if (storage_class
== csc_auto
3834 && (pedantic
|| current_scope
== file_scope
))
3835 pedwarn ("function definition declared %<auto%>");
3836 if (storage_class
== csc_register
)
3837 error ("function definition declared %<register%>");
3838 if (storage_class
== csc_typedef
)
3839 error ("function definition declared %<typedef%>");
3841 error ("function definition declared %<__thread%>");
3843 if (storage_class
== csc_auto
3844 || storage_class
== csc_register
3845 || storage_class
== csc_typedef
)
3846 storage_class
= csc_none
;
3848 else if (decl_context
!= NORMAL
&& (storage_class
!= csc_none
|| threadp
))
3850 if (decl_context
== PARM
&& storage_class
== csc_register
)
3854 switch (decl_context
)
3857 error ("storage class specified for structure field %qs",
3861 error ("storage class specified for parameter %qs", name
);
3864 error ("storage class specified for typename");
3867 storage_class
= csc_none
;
3871 else if (storage_class
== csc_extern
3875 /* 'extern' with initialization is invalid if not at file scope. */
3876 if (current_scope
== file_scope
)
3877 warning ("%qs initialized and declared %<extern%>", name
);
3879 error ("%qs has both %<extern%> and initializer", name
);
3881 else if (current_scope
== file_scope
)
3883 if (storage_class
== csc_auto
)
3884 error ("file-scope declaration of %qs specifies %<auto%>", name
);
3885 if (pedantic
&& storage_class
== csc_register
)
3886 pedwarn ("file-scope declaration of %qs specifies %<register%>", name
);
3890 if (storage_class
== csc_extern
&& funcdef_flag
)
3891 error ("nested function %qs declared %<extern%>", name
);
3892 else if (threadp
&& storage_class
== csc_none
)
3894 error ("function-scope %qs implicitly auto and declared "
3901 /* Now figure out the structure of the declarator proper.
3902 Descend through it, creating more complex types, until we reach
3903 the declared identifier (or NULL_TREE, in an absolute declarator). */
3905 while (declarator
&& declarator
->kind
!= cdk_id
)
3907 if (type
== error_mark_node
)
3909 declarator
= declarator
->declarator
;
3913 /* Each level of DECLARATOR is either a cdk_array (for ...[..]),
3914 a cdk_pointer (for *...),
3915 a cdk_function (for ...(...)),
3916 a cdk_attrs (for nested attributes),
3917 or a cdk_id (for the name being declared
3918 or the place in an absolute declarator
3919 where the name was omitted).
3920 For the last case, we have just exited the loop.
3922 At this point, TYPE is the type of elements of an array,
3923 or for a function to return, or for a pointer to point to.
3924 After this sequence of ifs, TYPE is the type of the
3925 array or function or pointer, and DECLARATOR has had its
3926 outermost layer removed. */
3928 if (array_ptr_quals
!= TYPE_UNQUALIFIED
3929 || array_ptr_attrs
!= NULL_TREE
3930 || array_parm_static
)
3932 /* Only the innermost declarator (making a parameter be of
3933 array type which is converted to pointer type)
3934 may have static or type qualifiers. */
3935 error ("static or type qualifiers in non-parameter array declarator");
3936 array_ptr_quals
= TYPE_UNQUALIFIED
;
3937 array_ptr_attrs
= NULL_TREE
;
3938 array_parm_static
= 0;
3941 switch (declarator
->kind
)
3945 /* A declarator with embedded attributes. */
3946 tree attrs
= declarator
->u
.attrs
;
3947 const struct c_declarator
*inner_decl
;
3949 declarator
= declarator
->declarator
;
3950 inner_decl
= declarator
;
3951 while (inner_decl
->kind
== cdk_attrs
)
3952 inner_decl
= inner_decl
->declarator
;
3953 if (inner_decl
->kind
== cdk_id
)
3954 attr_flags
|= (int) ATTR_FLAG_DECL_NEXT
;
3955 else if (inner_decl
->kind
== cdk_function
)
3956 attr_flags
|= (int) ATTR_FLAG_FUNCTION_NEXT
;
3957 else if (inner_decl
->kind
== cdk_array
)
3958 attr_flags
|= (int) ATTR_FLAG_ARRAY_NEXT
;
3959 returned_attrs
= decl_attributes (&type
,
3960 chainon (returned_attrs
, attrs
),
3966 tree itype
= NULL_TREE
;
3967 tree size
= declarator
->u
.array
.dimen
;
3968 /* The index is a signed object `sizetype' bits wide. */
3969 tree index_type
= c_common_signed_type (sizetype
);
3971 array_ptr_quals
= declarator
->u
.array
.quals
;
3972 array_ptr_attrs
= declarator
->u
.array
.attrs
;
3973 array_parm_static
= declarator
->u
.array
.static_p
;
3975 declarator
= declarator
->declarator
;
3977 /* Check for some types that there cannot be arrays of. */
3979 if (VOID_TYPE_P (type
))
3981 error ("declaration of %qs as array of voids", name
);
3982 type
= error_mark_node
;
3985 if (TREE_CODE (type
) == FUNCTION_TYPE
)
3987 error ("declaration of %qs as array of functions", name
);
3988 type
= error_mark_node
;
3991 if (pedantic
&& !in_system_header
&& flexible_array_type_p (type
))
3992 pedwarn ("invalid use of structure with flexible array member");
3994 if (size
== error_mark_node
)
3995 type
= error_mark_node
;
3997 if (type
== error_mark_node
)
4000 /* If size was specified, set ITYPE to a range-type for
4001 that size. Otherwise, ITYPE remains null. finish_decl
4002 may figure it out from an initial value. */
4006 /* Strip NON_LVALUE_EXPRs since we aren't using as an
4008 STRIP_TYPE_NOPS (size
);
4010 if (!INTEGRAL_TYPE_P (TREE_TYPE (size
)))
4012 error ("size of array %qs has non-integer type", name
);
4013 size
= integer_one_node
;
4016 if (pedantic
&& integer_zerop (size
))
4017 pedwarn ("ISO C forbids zero-size array %qs", name
);
4019 if (TREE_CODE (size
) == INTEGER_CST
)
4021 constant_expression_warning (size
);
4022 if (tree_int_cst_sgn (size
) < 0)
4024 error ("size of array %qs is negative", name
);
4025 size
= integer_one_node
;
4030 /* Make sure the array size remains visibly
4031 nonconstant even if it is (eg) a const variable
4032 with known value. */
4035 if (!flag_isoc99
&& pedantic
)
4037 if (TREE_CONSTANT (size
))
4038 pedwarn ("ISO C90 forbids array %qs whose size "
4039 "can%'t be evaluated",
4042 pedwarn ("ISO C90 forbids variable-size array %qs",
4047 if (integer_zerop (size
))
4049 /* A zero-length array cannot be represented with
4050 an unsigned index type, which is what we'll
4051 get with build_index_type. Create an
4052 open-ended range instead. */
4053 itype
= build_range_type (sizetype
, size
, NULL_TREE
);
4057 /* Compute the maximum valid index, that is, size
4058 - 1. Do the calculation in index_type, so that
4059 if it is a variable the computations will be
4060 done in the proper mode. */
4061 itype
= fold (build2 (MINUS_EXPR
, index_type
,
4062 convert (index_type
, size
),
4063 convert (index_type
,
4066 /* If that overflowed, the array is too big. ???
4067 While a size of INT_MAX+1 technically shouldn't
4068 cause an overflow (because we subtract 1), the
4069 overflow is recorded during the conversion to
4070 index_type, before the subtraction. Handling
4071 this case seems like an unnecessary
4073 if (TREE_OVERFLOW (itype
))
4075 error ("size of array %qs is too large", name
);
4076 type
= error_mark_node
;
4081 itype
= variable_size (itype
);
4082 itype
= build_index_type (itype
);
4085 else if (decl_context
== FIELD
)
4087 if (pedantic
&& !flag_isoc99
&& !in_system_header
)
4088 pedwarn ("ISO C90 does not support flexible array members");
4090 /* ISO C99 Flexible array members are effectively
4091 identical to GCC's zero-length array extension. */
4092 itype
= build_range_type (sizetype
, size_zero_node
, NULL_TREE
);
4095 /* If pedantic, complain about arrays of incomplete types. */
4096 if (pedantic
&& !COMPLETE_TYPE_P (type
))
4097 pedwarn ("array type has incomplete element type");
4099 /* Build the array type itself, then merge any constancy
4100 or volatility into the target type. We must do it in
4101 this order to ensure that the TYPE_MAIN_VARIANT field
4102 of the array type is set correctly. */
4103 type
= build_array_type (type
, itype
);
4105 type
= c_build_qualified_type (type
, type_quals
);
4108 C_TYPE_VARIABLE_SIZE (type
) = 1;
4110 /* The GCC extension for zero-length arrays differs from
4111 ISO flexible array members in that sizeof yields
4113 if (size
&& integer_zerop (size
))
4116 TYPE_SIZE (type
) = bitsize_zero_node
;
4117 TYPE_SIZE_UNIT (type
) = size_zero_node
;
4119 else if (declarator
->kind
== cdk_pointer
)
4120 /* We can never complete an array type which is the
4121 target of a pointer, so go ahead and lay it out. */
4124 if (decl_context
!= PARM
4125 && (array_ptr_quals
!= TYPE_UNQUALIFIED
4126 || array_ptr_attrs
!= NULL_TREE
4127 || array_parm_static
))
4129 error ("static or type qualifiers in non-parameter array declarator");
4130 array_ptr_quals
= TYPE_UNQUALIFIED
;
4131 array_ptr_attrs
= NULL_TREE
;
4132 array_parm_static
= 0;
4138 /* Say it's a definition only for the declarator closest
4139 to the identifier, apart possibly from some
4141 bool really_funcdef
= false;
4145 const struct c_declarator
*t
= declarator
->declarator
;
4146 while (t
->kind
== cdk_attrs
)
4148 really_funcdef
= (t
->kind
== cdk_id
);
4151 /* Declaring a function type. Make sure we have a valid
4152 type for the function to return. */
4153 if (type
== error_mark_node
)
4158 /* Warn about some types functions can't return. */
4159 if (TREE_CODE (type
) == FUNCTION_TYPE
)
4161 error ("%qs declared as function returning a function", name
);
4162 type
= integer_type_node
;
4164 if (TREE_CODE (type
) == ARRAY_TYPE
)
4166 error ("%qs declared as function returning an array", name
);
4167 type
= integer_type_node
;
4170 /* Construct the function type and go to the next
4171 inner layer of declarator. */
4172 arg_info
= declarator
->u
.arg_info
;
4173 arg_types
= grokparms (arg_info
, really_funcdef
);
4175 /* Type qualifiers before the return type of the function
4176 qualify the return type, not the function type. */
4179 /* Type qualifiers on a function return type are
4180 normally permitted by the standard but have no
4181 effect, so give a warning at -Wreturn-type.
4182 Qualifiers on a void return type are banned on
4183 function definitions in ISO C; GCC used to used
4184 them for noreturn functions. */
4185 if (VOID_TYPE_P (type
) && really_funcdef
)
4186 pedwarn ("function definition has qualified void return type");
4187 else if (warn_return_type
)
4188 warning ("type qualifiers ignored on function return type");
4190 type
= c_build_qualified_type (type
, type_quals
);
4192 type_quals
= TYPE_UNQUALIFIED
;
4194 type
= build_function_type (type
, arg_types
);
4195 declarator
= declarator
->declarator
;
4197 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4198 the formal parameter list of this FUNCTION_TYPE to point to
4199 the FUNCTION_TYPE node itself. */
4203 for (link
= arg_info
->tags
;
4205 link
= TREE_CHAIN (link
))
4206 TYPE_CONTEXT (TREE_VALUE (link
)) = type
;
4212 /* Merge any constancy or volatility into the target type
4215 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
4217 pedwarn ("ISO C forbids qualified function types");
4219 type
= c_build_qualified_type (type
, type_quals
);
4222 type
= build_pointer_type (type
);
4224 /* Process type qualifiers (such as const or volatile)
4225 that were given inside the `*'. */
4226 type_quals
= declarator
->u
.pointer_quals
;
4228 declarator
= declarator
->declarator
;
4236 /* Now TYPE has the actual type. */
4238 /* Did array size calculations overflow? */
4240 if (TREE_CODE (type
) == ARRAY_TYPE
4241 && COMPLETE_TYPE_P (type
)
4242 && TREE_OVERFLOW (TYPE_SIZE (type
)))
4244 error ("size of array %qs is too large", name
);
4245 /* If we proceed with the array type as it is, we'll eventually
4246 crash in tree_low_cst(). */
4247 type
= error_mark_node
;
4250 /* If this is declaring a typedef name, return a TYPE_DECL. */
4252 if (storage_class
== csc_typedef
)
4255 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
4257 pedwarn ("ISO C forbids qualified function types");
4259 type
= c_build_qualified_type (type
, type_quals
);
4260 decl
= build_decl (TYPE_DECL
, declarator
->u
.id
, type
);
4261 if (declspecs
->explicit_signed_p
)
4262 C_TYPEDEF_EXPLICITLY_SIGNED (decl
) = 1;
4263 decl_attributes (&decl
, returned_attrs
, 0);
4264 if (declspecs
->inline_p
)
4265 pedwarn ("%Jtypedef %qD declared %<inline%>", decl
, decl
);
4269 /* Detect the case of an array type of unspecified size
4270 which came, as such, direct from a typedef name.
4271 We must copy the type, so that each identifier gets
4272 a distinct type, so that each identifier's size can be
4273 controlled separately by its own initializer. */
4275 if (type
!= 0 && typedef_type
!= 0
4276 && TREE_CODE (type
) == ARRAY_TYPE
&& TYPE_DOMAIN (type
) == 0
4277 && TYPE_MAIN_VARIANT (type
) == TYPE_MAIN_VARIANT (typedef_type
))
4279 type
= build_array_type (TREE_TYPE (type
), 0);
4281 C_TYPE_VARIABLE_SIZE (type
) = 1;
4284 /* If this is a type name (such as, in a cast or sizeof),
4285 compute the type and return it now. */
4287 if (decl_context
== TYPENAME
)
4289 /* Note that the grammar rejects storage classes in typenames
4291 gcc_assert (storage_class
== csc_none
&& !threadp
4292 && !declspecs
->inline_p
);
4293 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
4295 pedwarn ("ISO C forbids const or volatile function types");
4297 type
= c_build_qualified_type (type
, type_quals
);
4298 decl_attributes (&type
, returned_attrs
, 0);
4302 /* Aside from typedefs and type names (handle above),
4303 `void' at top level (not within pointer)
4304 is allowed only in public variables.
4305 We don't complain about parms either, but that is because
4306 a better error message can be made later. */
4308 if (VOID_TYPE_P (type
) && decl_context
!= PARM
4309 && !((decl_context
!= FIELD
&& TREE_CODE (type
) != FUNCTION_TYPE
)
4310 && (storage_class
== csc_extern
4311 || (current_scope
== file_scope
4312 && !(storage_class
== csc_static
4313 || storage_class
== csc_register
)))))
4315 error ("variable or field %qs declared void", name
);
4316 type
= integer_type_node
;
4319 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4320 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4325 if (decl_context
== PARM
)
4327 tree type_as_written
;
4330 /* A parameter declared as an array of T is really a pointer to T.
4331 One declared as a function is really a pointer to a function. */
4333 if (TREE_CODE (type
) == ARRAY_TYPE
)
4335 /* Transfer const-ness of array into that of type pointed to. */
4336 type
= TREE_TYPE (type
);
4338 type
= c_build_qualified_type (type
, type_quals
);
4339 type
= build_pointer_type (type
);
4340 type_quals
= array_ptr_quals
;
4342 /* We don't yet implement attributes in this context. */
4343 if (array_ptr_attrs
!= NULL_TREE
)
4344 warning ("attributes in parameter array declarator ignored");
4348 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
4350 if (pedantic
&& type_quals
)
4351 pedwarn ("ISO C forbids qualified function types");
4353 type
= c_build_qualified_type (type
, type_quals
);
4354 type
= build_pointer_type (type
);
4355 type_quals
= TYPE_UNQUALIFIED
;
4357 else if (type_quals
)
4358 type
= c_build_qualified_type (type
, type_quals
);
4360 type_as_written
= type
;
4362 decl
= build_decl (PARM_DECL
, declarator
->u
.id
, type
);
4364 C_DECL_VARIABLE_SIZE (decl
) = 1;
4366 /* Compute the type actually passed in the parmlist,
4367 for the case where there is no prototype.
4368 (For example, shorts and chars are passed as ints.)
4369 When there is a prototype, this is overridden later. */
4371 if (type
== error_mark_node
)
4372 promoted_type
= type
;
4374 promoted_type
= c_type_promotes_to (type
);
4376 DECL_ARG_TYPE (decl
) = promoted_type
;
4377 DECL_ARG_TYPE_AS_WRITTEN (decl
) = type_as_written
;
4378 if (declspecs
->inline_p
)
4379 pedwarn ("%Jparameter %qD declared %<inline%>", decl
, decl
);
4381 else if (decl_context
== FIELD
)
4383 /* Note that the grammar rejects storage classes in typenames
4385 gcc_assert (storage_class
== csc_none
&& !threadp
4386 && !declspecs
->inline_p
);
4388 /* Structure field. It may not be a function. */
4390 if (TREE_CODE (type
) == FUNCTION_TYPE
)
4392 error ("field %qs declared as a function", name
);
4393 type
= build_pointer_type (type
);
4395 else if (TREE_CODE (type
) != ERROR_MARK
4396 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type
))
4398 error ("field %qs has incomplete type", name
);
4399 type
= error_mark_node
;
4401 /* Move type qualifiers down to element of an array. */
4402 if (TREE_CODE (type
) == ARRAY_TYPE
&& type_quals
)
4403 type
= build_array_type (c_build_qualified_type (TREE_TYPE (type
),
4405 TYPE_DOMAIN (type
));
4406 decl
= build_decl (FIELD_DECL
, declarator
->u
.id
, type
);
4407 DECL_NONADDRESSABLE_P (decl
) = bitfield
;
4410 C_DECL_VARIABLE_SIZE (decl
) = 1;
4412 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
4414 if (storage_class
== csc_register
|| threadp
)
4415 error ("invalid storage class for function %qs", name
);
4416 else if (current_scope
!= file_scope
)
4418 /* Function declaration not at file scope. Storage
4419 classes other than `extern' are not allowed, C99
4420 6.7.1p5, and `extern' makes no difference. However,
4421 GCC allows 'auto', perhaps with 'inline', to support
4422 nested functions. */
4423 if (storage_class
== csc_auto
)
4426 pedwarn ("invalid storage class for function %qs", name
);
4428 if (storage_class
== csc_static
)
4429 error ("invalid storage class for function %qs", name
);
4432 decl
= build_decl (FUNCTION_DECL
, declarator
->u
.id
, type
);
4433 decl
= build_decl_attribute_variant (decl
, decl_attr
);
4435 DECL_LANG_SPECIFIC (decl
) = GGC_CNEW (struct lang_decl
);
4437 if (pedantic
&& type_quals
&& !DECL_IN_SYSTEM_HEADER (decl
))
4438 pedwarn ("ISO C forbids qualified function types");
4440 /* GNU C interprets a volatile-qualified function type to indicate
4441 that the function does not return. */
4442 if ((type_quals
& TYPE_QUAL_VOLATILE
)
4443 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl
))))
4444 warning ("%<noreturn%> function returns non-void value");
4446 /* Every function declaration is an external reference
4447 (DECL_EXTERNAL) except for those which are not at file
4448 scope and are explicitly declared "auto". This is
4449 forbidden by standard C (C99 6.7.1p5) and is interpreted by
4450 GCC to signify a forward declaration of a nested function. */
4451 if (storage_class
== csc_auto
&& current_scope
!= file_scope
)
4452 DECL_EXTERNAL (decl
) = 0;
4454 DECL_EXTERNAL (decl
) = 1;
4456 /* Record absence of global scope for `static' or `auto'. */
4458 = !(storage_class
== csc_static
|| storage_class
== csc_auto
);
4460 /* For a function definition, record the argument information
4461 block where store_parm_decls will look for it. */
4463 current_function_arg_info
= arg_info
;
4465 if (declspecs
->default_int_p
)
4466 C_FUNCTION_IMPLICIT_INT (decl
) = 1;
4468 /* Record presence of `inline', if it is reasonable. */
4469 if (flag_hosted
&& MAIN_NAME_P (declarator
->u
.id
))
4471 if (declspecs
->inline_p
)
4472 pedwarn ("cannot inline function %<main%>");
4474 else if (declspecs
->inline_p
)
4476 /* Record that the function is declared `inline'. */
4477 DECL_DECLARED_INLINE_P (decl
) = 1;
4479 /* Do not mark bare declarations as DECL_INLINE. Doing so
4480 in the presence of multiple declarations can result in
4481 the abstract origin pointing between the declarations,
4482 which will confuse dwarf2out. */
4485 DECL_INLINE (decl
) = 1;
4486 if (storage_class
== csc_extern
)
4487 current_extern_inline
= 1;
4490 /* If -finline-functions, assume it can be inlined. This does
4491 two things: let the function be deferred until it is actually
4492 needed, and let dwarf2 know that the function is inlinable. */
4493 else if (flag_inline_trees
== 2 && initialized
)
4494 DECL_INLINE (decl
) = 1;
4498 /* It's a variable. */
4499 /* An uninitialized decl with `extern' is a reference. */
4500 int extern_ref
= !initialized
&& storage_class
== csc_extern
;
4502 /* Move type qualifiers down to element of an array. */
4503 if (TREE_CODE (type
) == ARRAY_TYPE
&& type_quals
)
4505 int saved_align
= TYPE_ALIGN(type
);
4506 type
= build_array_type (c_build_qualified_type (TREE_TYPE (type
),
4508 TYPE_DOMAIN (type
));
4509 TYPE_ALIGN (type
) = saved_align
;
4511 else if (type_quals
)
4512 type
= c_build_qualified_type (type
, type_quals
);
4514 /* C99 6.2.2p7: It is invalid (compile-time undefined
4515 behavior) to create an 'extern' declaration for a
4516 variable if there is a global declaration that is
4517 'static' and the global declaration is not visible.
4518 (If the static declaration _is_ currently visible,
4519 the 'extern' declaration is taken to refer to that decl.) */
4520 if (extern_ref
&& current_scope
!= file_scope
)
4522 tree global_decl
= identifier_global_value (declarator
->u
.id
);
4523 tree visible_decl
= lookup_name (declarator
->u
.id
);
4526 && global_decl
!= visible_decl
4527 && TREE_CODE (global_decl
) == VAR_DECL
4528 && !TREE_PUBLIC (global_decl
))
4529 error ("variable previously declared %<static%> redeclared "
4533 decl
= build_decl (VAR_DECL
, declarator
->u
.id
, type
);
4535 C_DECL_VARIABLE_SIZE (decl
) = 1;
4537 if (declspecs
->inline_p
)
4538 pedwarn ("%Jvariable %qD declared %<inline%>", decl
, decl
);
4540 /* At file scope, an initialized extern declaration may follow
4541 a static declaration. In that case, DECL_EXTERNAL will be
4542 reset later in start_decl. */
4543 DECL_EXTERNAL (decl
) = (storage_class
== csc_extern
);
4545 /* At file scope, the presence of a `static' or `register' storage
4546 class specifier, or the absence of all storage class specifiers
4547 makes this declaration a definition (perhaps tentative). Also,
4548 the absence of both `static' and `register' makes it public. */
4549 if (current_scope
== file_scope
)
4551 TREE_PUBLIC (decl
) = !(storage_class
== csc_static
4552 || storage_class
== csc_register
);
4553 TREE_STATIC (decl
) = !extern_ref
;
4555 /* Not at file scope, only `static' makes a static definition. */
4558 TREE_STATIC (decl
) = (storage_class
== csc_static
);
4559 TREE_PUBLIC (decl
) = extern_ref
;
4564 if (targetm
.have_tls
)
4565 DECL_THREAD_LOCAL (decl
) = 1;
4567 /* A mere warning is sure to result in improper semantics
4568 at runtime. Don't bother to allow this to compile. */
4569 error ("thread-local storage not supported for this target");
4573 /* Record `register' declaration for warnings on &
4574 and in case doing stupid register allocation. */
4576 if (storage_class
== csc_register
)
4578 C_DECL_REGISTER (decl
) = 1;
4579 DECL_REGISTER (decl
) = 1;
4582 /* Record constancy and volatility. */
4583 c_apply_type_quals_to_decl (type_quals
, decl
);
4585 /* If a type has volatile components, it should be stored in memory.
4586 Otherwise, the fact that those components are volatile
4587 will be ignored, and would even crash the compiler. */
4588 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl
)))
4590 /* It is not an error for a structure with volatile fields to
4591 be declared register, but reset DECL_REGISTER since it
4592 cannot actually go in a register. */
4593 int was_reg
= C_DECL_REGISTER (decl
);
4594 C_DECL_REGISTER (decl
) = 0;
4595 DECL_REGISTER (decl
) = 0;
4596 c_mark_addressable (decl
);
4597 C_DECL_REGISTER (decl
) = was_reg
;
4600 /* This is the earliest point at which we might know the assembler
4601 name of a variable. Thus, if it's known before this, die horribly. */
4602 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl
));
4604 decl_attributes (&decl
, returned_attrs
, 0);
4610 /* Decode the parameter-list info for a function type or function definition.
4611 The argument is the value returned by `get_parm_info' (or made in parse.y
4612 if there is an identifier list instead of a parameter decl list).
4613 These two functions are separate because when a function returns
4614 or receives functions then each is called multiple times but the order
4615 of calls is different. The last call to `grokparms' is always the one
4616 that contains the formal parameter names of a function definition.
4618 Return a list of arg types to use in the FUNCTION_TYPE for this function.
4620 FUNCDEF_FLAG is true for a function definition, false for
4621 a mere declaration. A nonempty identifier-list gets an error message
4622 when FUNCDEF_FLAG is false. */
4625 grokparms (struct c_arg_info
*arg_info
, bool funcdef_flag
)
4627 tree arg_types
= arg_info
->types
;
4629 if (warn_strict_prototypes
&& arg_types
== 0 && !funcdef_flag
4630 && !in_system_header
)
4631 warning ("function declaration isn%'t a prototype");
4633 if (arg_types
== error_mark_node
)
4634 return 0; /* don't set TYPE_ARG_TYPES in this case */
4636 else if (arg_types
&& TREE_CODE (TREE_VALUE (arg_types
)) == IDENTIFIER_NODE
)
4639 pedwarn ("parameter names (without types) in function declaration");
4641 arg_info
->parms
= arg_info
->types
;
4642 arg_info
->types
= 0;
4647 tree parm
, type
, typelt
;
4648 unsigned int parmno
;
4650 /* If the arg types are incomplete in a declaration, they must
4651 include undefined tags. These tags can never be defined in
4652 the scope of the declaration, so the types can never be
4653 completed, and no call can be compiled successfully. */
4655 for (parm
= arg_info
->parms
, typelt
= arg_types
, parmno
= 1;
4657 parm
= TREE_CHAIN (parm
), typelt
= TREE_CHAIN (typelt
), parmno
++)
4659 type
= TREE_VALUE (typelt
);
4660 if (type
== error_mark_node
)
4663 if (!COMPLETE_TYPE_P (type
))
4667 if (DECL_NAME (parm
))
4668 error ("%Jparameter %u (%qD) has incomplete type",
4669 parm
, parmno
, parm
);
4671 error ("%Jparameter %u has incomplete type",
4674 TREE_VALUE (typelt
) = error_mark_node
;
4675 TREE_TYPE (parm
) = error_mark_node
;
4679 if (DECL_NAME (parm
))
4680 warning ("%Jparameter %u (%qD) has incomplete type",
4681 parm
, parmno
, parm
);
4683 warning ("%Jparameter %u has incomplete type",
4692 /* Take apart the current scope and return a c_arg_info structure with
4693 info on a parameter list just parsed.
4695 This structure is later fed to 'grokparms' and 'store_parm_decls'.
4697 ELLIPSIS being true means the argument list ended in '...' so don't
4698 append a sentinel (void_list_node) to the end of the type-list. */
4701 get_parm_info (bool ellipsis
)
4703 struct c_binding
*b
= current_scope
->bindings
;
4704 struct c_arg_info
*arg_info
= XOBNEW (&parser_obstack
,
4711 static bool explained_incomplete_types
= false;
4712 bool gave_void_only_once_err
= false;
4714 arg_info
->parms
= 0;
4716 arg_info
->types
= 0;
4717 arg_info
->others
= 0;
4719 /* The bindings in this scope must not get put into a block.
4720 We will take care of deleting the binding nodes. */
4721 current_scope
->bindings
= 0;
4723 /* This function is only called if there was *something* on the
4727 /* A parameter list consisting solely of 'void' indicates that the
4728 function takes no arguments. But if the 'void' is qualified
4729 (by 'const' or 'volatile'), or has a storage class specifier
4730 ('register'), then the behavior is undefined; issue an error.
4731 Typedefs for 'void' are OK (see DR#157). */
4732 if (b
->prev
== 0 /* one binding */
4733 && TREE_CODE (b
->decl
) == PARM_DECL
/* which is a parameter */
4734 && !DECL_NAME (b
->decl
) /* anonymous */
4735 && VOID_TYPE_P (TREE_TYPE (b
->decl
))) /* of void type */
4737 if (TREE_THIS_VOLATILE (b
->decl
)
4738 || TREE_READONLY (b
->decl
)
4739 || C_DECL_REGISTER (b
->decl
))
4740 error ("%<void%> as only parameter may not be qualified");
4742 /* There cannot be an ellipsis. */
4744 error ("%<void%> must be the only parameter");
4746 arg_info
->types
= void_list_node
;
4751 types
= void_list_node
;
4753 /* Break up the bindings list into parms, tags, types, and others;
4754 apply sanity checks; purge the name-to-decl bindings. */
4757 tree decl
= b
->decl
;
4758 tree type
= TREE_TYPE (decl
);
4759 const char *keyword
;
4761 switch (TREE_CODE (decl
))
4766 gcc_assert (I_SYMBOL_BINDING (b
->id
) == b
);
4767 I_SYMBOL_BINDING (b
->id
) = b
->shadowed
;
4770 /* Check for forward decls that never got their actual decl. */
4771 if (TREE_ASM_WRITTEN (decl
))
4772 error ("%Jparameter %qD has just a forward declaration",
4774 /* Check for (..., void, ...) and issue an error. */
4775 else if (VOID_TYPE_P (type
) && !DECL_NAME (decl
))
4777 if (!gave_void_only_once_err
)
4779 error ("%<void%> must be the only parameter");
4780 gave_void_only_once_err
= true;
4785 /* Valid parameter, add it to the list. */
4786 TREE_CHAIN (decl
) = parms
;
4789 /* Since there is a prototype, args are passed in their
4790 declared types. The back end may override this later. */
4791 DECL_ARG_TYPE (decl
) = type
;
4792 types
= tree_cons (0, type
, types
);
4796 case ENUMERAL_TYPE
: keyword
= "enum"; goto tag
;
4797 case UNION_TYPE
: keyword
= "union"; goto tag
;
4798 case RECORD_TYPE
: keyword
= "struct"; goto tag
;
4800 /* Types may not have tag-names, in which case the type
4801 appears in the bindings list with b->id NULL. */
4804 gcc_assert (I_TAG_BINDING (b
->id
) == b
);
4805 I_TAG_BINDING (b
->id
) = b
->shadowed
;
4808 /* Warn about any struct, union or enum tags defined in a
4809 parameter list. The scope of such types is limited to
4810 the parameter list, which is rarely if ever desirable
4811 (it's impossible to call such a function with type-
4812 correct arguments). An anonymous union parm type is
4813 meaningful as a GNU extension, so don't warn for that. */
4814 if (TREE_CODE (decl
) != UNION_TYPE
|| b
->id
!= 0)
4817 /* The %s will be one of 'struct', 'union', or 'enum'. */
4818 warning ("%<%s %E%> declared inside parameter list",
4821 /* The %s will be one of 'struct', 'union', or 'enum'. */
4822 warning ("anonymous %s declared inside parameter list",
4825 if (!explained_incomplete_types
)
4827 warning ("its scope is only this definition or declaration,"
4828 " which is probably not what you want");
4829 explained_incomplete_types
= true;
4833 tags
= tree_cons (b
->id
, decl
, tags
);
4838 /* CONST_DECLs appear here when we have an embedded enum,
4839 and TYPE_DECLs appear here when we have an embedded struct
4840 or union. No warnings for this - we already warned about the
4842 TREE_CHAIN (decl
) = others
;
4847 /* error_mark_node appears here when we have an undeclared
4848 variable. Just throw it away. */
4851 gcc_assert (I_SYMBOL_BINDING (b
->id
) == b
);
4852 I_SYMBOL_BINDING (b
->id
) = b
->shadowed
;
4856 /* Other things that might be encountered. */
4864 b
= free_binding_and_advance (b
);
4867 arg_info
->parms
= parms
;
4868 arg_info
->tags
= tags
;
4869 arg_info
->types
= types
;
4870 arg_info
->others
= others
;
4874 /* Get the struct, enum or union (CODE says which) with tag NAME.
4875 Define the tag as a forward-reference if it is not defined. */
4878 xref_tag (enum tree_code code
, tree name
)
4880 /* If a cross reference is requested, look up the type
4881 already defined for this tag and return it. */
4883 tree ref
= lookup_tag (code
, name
, 0);
4884 /* If this is the right type of tag, return what we found.
4885 (This reference will be shadowed by shadow_tag later if appropriate.)
4886 If this is the wrong type of tag, do not return it. If it was the
4887 wrong type in the same scope, we will have had an error
4888 message already; if in a different scope and declaring
4889 a name, pending_xref_error will give an error message; but if in a
4890 different scope and not declaring a name, this tag should
4891 shadow the previous declaration of a different type of tag, and
4892 this would not work properly if we return the reference found.
4893 (For example, with "struct foo" in an outer scope, "union foo;"
4894 must shadow that tag with a new one of union type.) */
4895 if (ref
&& TREE_CODE (ref
) == code
)
4898 /* If no such tag is yet defined, create a forward-reference node
4899 and record it as the "definition".
4900 When a real declaration of this type is found,
4901 the forward-reference will be altered into a real type. */
4903 ref
= make_node (code
);
4904 if (code
== ENUMERAL_TYPE
)
4906 /* Give the type a default layout like unsigned int
4907 to avoid crashing if it does not get defined. */
4908 TYPE_MODE (ref
) = TYPE_MODE (unsigned_type_node
);
4909 TYPE_ALIGN (ref
) = TYPE_ALIGN (unsigned_type_node
);
4910 TYPE_USER_ALIGN (ref
) = 0;
4911 TYPE_UNSIGNED (ref
) = 1;
4912 TYPE_PRECISION (ref
) = TYPE_PRECISION (unsigned_type_node
);
4913 TYPE_MIN_VALUE (ref
) = TYPE_MIN_VALUE (unsigned_type_node
);
4914 TYPE_MAX_VALUE (ref
) = TYPE_MAX_VALUE (unsigned_type_node
);
4917 pushtag (name
, ref
);
4922 /* Make sure that the tag NAME is defined *in the current scope*
4923 at least as a forward reference.
4924 CODE says which kind of tag NAME ought to be. */
4927 start_struct (enum tree_code code
, tree name
)
4929 /* If there is already a tag defined at this scope
4930 (as a forward reference), just return it. */
4935 ref
= lookup_tag (code
, name
, 1);
4936 if (ref
&& TREE_CODE (ref
) == code
)
4938 if (TYPE_SIZE (ref
))
4940 if (code
== UNION_TYPE
)
4941 error ("redefinition of %<union %s%>", IDENTIFIER_POINTER (name
));
4943 error ("redefinition of %<struct %s%>", IDENTIFIER_POINTER (name
));
4945 else if (C_TYPE_BEING_DEFINED (ref
))
4947 if (code
== UNION_TYPE
)
4948 error ("nested redefinition of %<union %s%>",
4949 IDENTIFIER_POINTER (name
));
4951 error ("nested redefinition of %<struct %s%>",
4952 IDENTIFIER_POINTER (name
));
4957 /* Otherwise create a forward-reference just so the tag is in scope. */
4959 ref
= make_node (code
);
4960 pushtag (name
, ref
);
4963 C_TYPE_BEING_DEFINED (ref
) = 1;
4964 TYPE_PACKED (ref
) = flag_pack_struct
;
4968 /* Process the specs, declarator and width (NULL if omitted)
4969 of a structure component, returning a FIELD_DECL node.
4970 WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node.
4972 This is done during the parsing of the struct declaration.
4973 The FIELD_DECL nodes are chained together and the lot of them
4974 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
4977 grokfield (struct c_declarator
*declarator
, struct c_declspecs
*declspecs
,
4982 if (declarator
->kind
== cdk_id
&& declarator
->u
.id
== NULL_TREE
4983 && width
== NULL_TREE
)
4985 /* This is an unnamed decl.
4987 If we have something of the form "union { list } ;" then this
4988 is the anonymous union extension. Similarly for struct.
4990 If this is something of the form "struct foo;", then
4991 If MS extensions are enabled, this is handled as an
4993 Otherwise this is a forward declaration of a structure tag.
4995 If this is something of the form "foo;" and foo is a TYPE_DECL, then
4996 If MS extensions are enabled and foo names a structure, then
4997 again this is an anonymous struct.
4998 Otherwise this is an error.
5000 Oh what a horrid tangled web we weave. I wonder if MS consciously
5001 took this from Plan 9 or if it was an accident of implementation
5002 that took root before someone noticed the bug... */
5004 tree type
= declspecs
->type
;
5007 && (TREE_CODE (type
) == RECORD_TYPE
5008 || TREE_CODE (type
) == UNION_TYPE
)
5009 && (flag_ms_extensions
|| !declspecs
->typedef_p
))
5011 if (flag_ms_extensions
)
5014 goto warn_unnamed_field
;
5015 else if (TYPE_NAME (type
) == NULL
)
5018 goto warn_unnamed_field
;
5023 warning ("declaration does not declare anything");
5028 value
= grokdeclarator (declarator
, declspecs
, FIELD
, false,
5029 width
? &width
: NULL
);
5031 finish_decl (value
, NULL_TREE
, NULL_TREE
);
5032 DECL_INITIAL (value
) = width
;
5037 /* Generate an error for any duplicate field names in FIELDLIST. Munge
5038 the list such that this does not present a problem later. */
5041 detect_field_duplicates (tree fieldlist
)
5046 /* First, see if there are more than "a few" fields.
5047 This is trivially true if there are zero or one fields. */
5050 x
= TREE_CHAIN (fieldlist
);
5056 } while (timeout
> 0 && x
);
5058 /* If there were "few" fields, avoid the overhead of allocating
5059 a hash table. Instead just do the nested traversal thing. */
5062 for (x
= TREE_CHAIN (fieldlist
); x
; x
= TREE_CHAIN (x
))
5065 for (y
= fieldlist
; y
!= x
; y
= TREE_CHAIN (y
))
5066 if (DECL_NAME (y
) == DECL_NAME (x
))
5068 error ("%Jduplicate member %qD", x
, x
);
5069 DECL_NAME (x
) = NULL_TREE
;
5075 htab_t htab
= htab_create (37, htab_hash_pointer
, htab_eq_pointer
, NULL
);
5078 for (x
= fieldlist
; x
; x
= TREE_CHAIN (x
))
5079 if ((y
= DECL_NAME (x
)) != 0)
5081 slot
= htab_find_slot (htab
, y
, INSERT
);
5084 error ("%Jduplicate member %qD", x
, x
);
5085 DECL_NAME (x
) = NULL_TREE
;
5094 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5095 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5096 ATTRIBUTES are attributes to be applied to the structure. */
5099 finish_struct (tree t
, tree fieldlist
, tree attributes
)
5102 bool toplevel
= file_scope
== current_scope
;
5103 int saw_named_field
;
5105 /* If this type was previously laid out as a forward reference,
5106 make sure we lay it out again. */
5110 decl_attributes (&t
, attributes
, (int) ATTR_FLAG_TYPE_IN_PLACE
);
5114 for (x
= fieldlist
; x
; x
= TREE_CHAIN (x
))
5115 if (DECL_NAME (x
) != 0)
5119 pedwarn ("%s has no %s",
5120 TREE_CODE (t
) == UNION_TYPE
? _("union") : _("struct"),
5121 fieldlist
? _("named members") : _("members"));
5124 /* Install struct as DECL_CONTEXT of each field decl.
5125 Also process specified field sizes, found in the DECL_INITIAL,
5126 storing 0 there after the type has been changed to precision equal
5127 to its width, rather than the precision of the specified standard
5128 type. (Correct layout requires the original type to have been preserved
5131 saw_named_field
= 0;
5132 for (x
= fieldlist
; x
; x
= TREE_CHAIN (x
))
5134 DECL_CONTEXT (x
) = t
;
5135 DECL_PACKED (x
) |= TYPE_PACKED (t
);
5137 /* If any field is const, the structure type is pseudo-const. */
5138 if (TREE_READONLY (x
))
5139 C_TYPE_FIELDS_READONLY (t
) = 1;
5142 /* A field that is pseudo-const makes the structure likewise. */
5143 tree t1
= TREE_TYPE (x
);
5144 while (TREE_CODE (t1
) == ARRAY_TYPE
)
5145 t1
= TREE_TYPE (t1
);
5146 if ((TREE_CODE (t1
) == RECORD_TYPE
|| TREE_CODE (t1
) == UNION_TYPE
)
5147 && C_TYPE_FIELDS_READONLY (t1
))
5148 C_TYPE_FIELDS_READONLY (t
) = 1;
5151 /* Any field that is volatile means variables of this type must be
5152 treated in some ways as volatile. */
5153 if (TREE_THIS_VOLATILE (x
))
5154 C_TYPE_FIELDS_VOLATILE (t
) = 1;
5156 /* Any field of nominal variable size implies structure is too. */
5157 if (C_DECL_VARIABLE_SIZE (x
))
5158 C_TYPE_VARIABLE_SIZE (t
) = 1;
5160 if (DECL_INITIAL (x
))
5162 unsigned HOST_WIDE_INT width
= tree_low_cst (DECL_INITIAL (x
), 1);
5163 DECL_SIZE (x
) = bitsize_int (width
);
5164 DECL_BIT_FIELD (x
) = 1;
5165 SET_DECL_C_BIT_FIELD (x
);
5168 /* Detect flexible array member in an invalid context. */
5169 if (TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
5170 && TYPE_SIZE (TREE_TYPE (x
)) == NULL_TREE
5171 && TYPE_DOMAIN (TREE_TYPE (x
)) != NULL_TREE
5172 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x
))) == NULL_TREE
)
5174 if (TREE_CODE (t
) == UNION_TYPE
)
5176 error ("%Jflexible array member in union", x
);
5177 TREE_TYPE (x
) = error_mark_node
;
5179 else if (TREE_CHAIN (x
) != NULL_TREE
)
5181 error ("%Jflexible array member not at end of struct", x
);
5182 TREE_TYPE (x
) = error_mark_node
;
5184 else if (!saw_named_field
)
5186 error ("%Jflexible array member in otherwise empty struct", x
);
5187 TREE_TYPE (x
) = error_mark_node
;
5191 if (pedantic
&& !in_system_header
&& TREE_CODE (t
) == RECORD_TYPE
5192 && flexible_array_type_p (TREE_TYPE (x
)))
5193 pedwarn ("%Jinvalid use of structure with flexible array member", x
);
5196 saw_named_field
= 1;
5199 detect_field_duplicates (fieldlist
);
5201 /* Now we have the nearly final fieldlist. Record it,
5202 then lay out the structure or union (including the fields). */
5204 TYPE_FIELDS (t
) = fieldlist
;
5208 /* Give bit-fields their proper types. */
5210 tree
*fieldlistp
= &fieldlist
;
5212 if (TREE_CODE (*fieldlistp
) == FIELD_DECL
&& DECL_INITIAL (*fieldlistp
)
5213 && TREE_TYPE (*fieldlistp
) != error_mark_node
)
5215 unsigned HOST_WIDE_INT width
5216 = tree_low_cst (DECL_INITIAL (*fieldlistp
), 1);
5217 tree type
= TREE_TYPE (*fieldlistp
);
5218 if (width
!= TYPE_PRECISION (type
))
5219 TREE_TYPE (*fieldlistp
)
5220 = build_nonstandard_integer_type (width
, TYPE_UNSIGNED (type
));
5221 DECL_INITIAL (*fieldlistp
) = 0;
5224 fieldlistp
= &TREE_CHAIN (*fieldlistp
);
5227 /* Now we have the truly final field list.
5228 Store it in this type and in the variants. */
5230 TYPE_FIELDS (t
) = fieldlist
;
5232 /* If there are lots of fields, sort so we can look through them fast.
5233 We arbitrarily consider 16 or more elts to be "a lot". */
5238 for (x
= fieldlist
; x
; x
= TREE_CHAIN (x
))
5240 if (len
> 15 || DECL_NAME (x
) == NULL
)
5248 struct lang_type
*space
;
5249 struct sorted_fields_type
*space2
;
5251 len
+= list_length (x
);
5253 /* Use the same allocation policy here that make_node uses, to
5254 ensure that this lives as long as the rest of the struct decl.
5255 All decls in an inline function need to be saved. */
5257 space
= GGC_CNEW (struct lang_type
);
5258 space2
= GGC_NEWVAR (struct sorted_fields_type
,
5259 sizeof (struct sorted_fields_type
) + len
* sizeof (tree
));
5263 field_array
= &space2
->elts
[0];
5264 for (x
= fieldlist
; x
; x
= TREE_CHAIN (x
))
5266 field_array
[len
++] = x
;
5268 /* If there is anonymous struct or union, break out of the loop. */
5269 if (DECL_NAME (x
) == NULL
)
5272 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
5275 TYPE_LANG_SPECIFIC (t
) = space
;
5276 TYPE_LANG_SPECIFIC (t
)->s
->len
= len
;
5277 field_array
= TYPE_LANG_SPECIFIC (t
)->s
->elts
;
5278 qsort (field_array
, len
, sizeof (tree
), field_decl_cmp
);
5283 for (x
= TYPE_MAIN_VARIANT (t
); x
; x
= TYPE_NEXT_VARIANT (x
))
5285 TYPE_FIELDS (x
) = TYPE_FIELDS (t
);
5286 TYPE_LANG_SPECIFIC (x
) = TYPE_LANG_SPECIFIC (t
);
5287 TYPE_ALIGN (x
) = TYPE_ALIGN (t
);
5288 TYPE_USER_ALIGN (x
) = TYPE_USER_ALIGN (t
);
5291 /* If this was supposed to be a transparent union, but we can't
5292 make it one, warn and turn off the flag. */
5293 if (TREE_CODE (t
) == UNION_TYPE
5294 && TYPE_TRANSPARENT_UNION (t
)
5295 && TYPE_MODE (t
) != DECL_MODE (TYPE_FIELDS (t
)))
5297 TYPE_TRANSPARENT_UNION (t
) = 0;
5298 warning ("union cannot be made transparent");
5301 /* If this structure or union completes the type of any previous
5302 variable declaration, lay it out and output its rtl. */
5303 for (x
= C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t
));
5307 tree decl
= TREE_VALUE (x
);
5308 if (TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
)
5309 layout_array_type (TREE_TYPE (decl
));
5310 if (TREE_CODE (decl
) != TYPE_DECL
)
5312 layout_decl (decl
, 0);
5313 if (c_dialect_objc ())
5314 objc_check_decl (decl
);
5315 rest_of_decl_compilation (decl
, toplevel
, 0);
5320 C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t
)) = 0;
5322 /* Finish debugging output for this type. */
5323 rest_of_type_compilation (t
, toplevel
);
5328 /* Lay out the type T, and its element type, and so on. */
5331 layout_array_type (tree t
)
5333 if (TREE_CODE (TREE_TYPE (t
)) == ARRAY_TYPE
)
5334 layout_array_type (TREE_TYPE (t
));
5338 /* Begin compiling the definition of an enumeration type.
5339 NAME is its name (or null if anonymous).
5340 Returns the type object, as yet incomplete.
5341 Also records info about it so that build_enumerator
5342 may be used to declare the individual values as they are read. */
5345 start_enum (tree name
)
5349 /* If this is the real definition for a previous forward reference,
5350 fill in the contents in the same object that used to be the
5351 forward reference. */
5354 enumtype
= lookup_tag (ENUMERAL_TYPE
, name
, 1);
5356 if (enumtype
== 0 || TREE_CODE (enumtype
) != ENUMERAL_TYPE
)
5358 enumtype
= make_node (ENUMERAL_TYPE
);
5359 pushtag (name
, enumtype
);
5362 if (C_TYPE_BEING_DEFINED (enumtype
))
5363 error ("nested redefinition of %<enum %s%>", IDENTIFIER_POINTER (name
));
5365 C_TYPE_BEING_DEFINED (enumtype
) = 1;
5367 if (TYPE_VALUES (enumtype
) != 0)
5369 /* This enum is a named one that has been declared already. */
5370 error ("redeclaration of %<enum %s%>", IDENTIFIER_POINTER (name
));
5372 /* Completely replace its old definition.
5373 The old enumerators remain defined, however. */
5374 TYPE_VALUES (enumtype
) = 0;
5377 enum_next_value
= integer_zero_node
;
5380 if (flag_short_enums
)
5381 TYPE_PACKED (enumtype
) = 1;
5386 /* After processing and defining all the values of an enumeration type,
5387 install their decls in the enumeration type and finish it off.
5388 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5389 and ATTRIBUTES are the specified attributes.
5390 Returns ENUMTYPE. */
5393 finish_enum (tree enumtype
, tree values
, tree attributes
)
5396 tree minnode
= 0, maxnode
= 0;
5397 int precision
, unsign
;
5398 bool toplevel
= (file_scope
== current_scope
);
5399 struct lang_type
*lt
;
5401 decl_attributes (&enumtype
, attributes
, (int) ATTR_FLAG_TYPE_IN_PLACE
);
5403 /* Calculate the maximum value of any enumerator in this type. */
5405 if (values
== error_mark_node
)
5406 minnode
= maxnode
= integer_zero_node
;
5409 minnode
= maxnode
= TREE_VALUE (values
);
5410 for (pair
= TREE_CHAIN (values
); pair
; pair
= TREE_CHAIN (pair
))
5412 tree value
= TREE_VALUE (pair
);
5413 if (tree_int_cst_lt (maxnode
, value
))
5415 if (tree_int_cst_lt (value
, minnode
))
5420 /* Construct the final type of this enumeration. It is the same
5421 as one of the integral types - the narrowest one that fits, except
5422 that normally we only go as narrow as int - and signed iff any of
5423 the values are negative. */
5424 unsign
= (tree_int_cst_sgn (minnode
) >= 0);
5425 precision
= MAX (min_precision (minnode
, unsign
),
5426 min_precision (maxnode
, unsign
));
5428 if (TYPE_PACKED (enumtype
) || precision
> TYPE_PRECISION (integer_type_node
))
5430 tem
= c_common_type_for_size (precision
, unsign
);
5433 warning ("enumeration values exceed range of largest integer");
5434 tem
= long_long_integer_type_node
;
5438 tem
= unsign
? unsigned_type_node
: integer_type_node
;
5440 TYPE_MIN_VALUE (enumtype
) = TYPE_MIN_VALUE (tem
);
5441 TYPE_MAX_VALUE (enumtype
) = TYPE_MAX_VALUE (tem
);
5442 TYPE_UNSIGNED (enumtype
) = TYPE_UNSIGNED (tem
);
5443 TYPE_SIZE (enumtype
) = 0;
5445 /* If the precision of the type was specific with an attribute and it
5446 was too small, give an error. Otherwise, use it. */
5447 if (TYPE_PRECISION (enumtype
))
5449 if (precision
> TYPE_PRECISION (enumtype
))
5450 error ("specified mode too small for enumeral values");
5453 TYPE_PRECISION (enumtype
) = TYPE_PRECISION (tem
);
5455 layout_type (enumtype
);
5457 if (values
!= error_mark_node
)
5459 /* Change the type of the enumerators to be the enum type. We
5460 need to do this irrespective of the size of the enum, for
5461 proper type checking. Replace the DECL_INITIALs of the
5462 enumerators, and the value slots of the list, with copies
5463 that have the enum type; they cannot be modified in place
5464 because they may be shared (e.g. integer_zero_node) Finally,
5465 change the purpose slots to point to the names of the decls. */
5466 for (pair
= values
; pair
; pair
= TREE_CHAIN (pair
))
5468 tree enu
= TREE_PURPOSE (pair
);
5469 tree ini
= DECL_INITIAL (enu
);
5471 TREE_TYPE (enu
) = enumtype
;
5473 /* The ISO C Standard mandates enumerators to have type int,
5474 even though the underlying type of an enum type is
5475 unspecified. Here we convert any enumerators that fit in
5476 an int to type int, to avoid promotions to unsigned types
5477 when comparing integers with enumerators that fit in the
5478 int range. When -pedantic is given, build_enumerator()
5479 would have already taken care of those that don't fit. */
5480 if (int_fits_type_p (ini
, integer_type_node
))
5481 tem
= integer_type_node
;
5484 ini
= convert (tem
, ini
);
5486 DECL_INITIAL (enu
) = ini
;
5487 TREE_PURPOSE (pair
) = DECL_NAME (enu
);
5488 TREE_VALUE (pair
) = ini
;
5491 TYPE_VALUES (enumtype
) = values
;
5494 /* Record the min/max values so that we can warn about bit-field
5495 enumerations that are too small for the values. */
5496 lt
= GGC_CNEW (struct lang_type
);
5497 lt
->enum_min
= minnode
;
5498 lt
->enum_max
= maxnode
;
5499 TYPE_LANG_SPECIFIC (enumtype
) = lt
;
5501 /* Fix up all variant types of this enum type. */
5502 for (tem
= TYPE_MAIN_VARIANT (enumtype
); tem
; tem
= TYPE_NEXT_VARIANT (tem
))
5504 if (tem
== enumtype
)
5506 TYPE_VALUES (tem
) = TYPE_VALUES (enumtype
);
5507 TYPE_MIN_VALUE (tem
) = TYPE_MIN_VALUE (enumtype
);
5508 TYPE_MAX_VALUE (tem
) = TYPE_MAX_VALUE (enumtype
);
5509 TYPE_SIZE (tem
) = TYPE_SIZE (enumtype
);
5510 TYPE_SIZE_UNIT (tem
) = TYPE_SIZE_UNIT (enumtype
);
5511 TYPE_MODE (tem
) = TYPE_MODE (enumtype
);
5512 TYPE_PRECISION (tem
) = TYPE_PRECISION (enumtype
);
5513 TYPE_ALIGN (tem
) = TYPE_ALIGN (enumtype
);
5514 TYPE_USER_ALIGN (tem
) = TYPE_USER_ALIGN (enumtype
);
5515 TYPE_UNSIGNED (tem
) = TYPE_UNSIGNED (enumtype
);
5516 TYPE_LANG_SPECIFIC (tem
) = TYPE_LANG_SPECIFIC (enumtype
);
5519 /* Finish debugging output for this type. */
5520 rest_of_type_compilation (enumtype
, toplevel
);
5525 /* Build and install a CONST_DECL for one value of the
5526 current enumeration type (one that was begun with start_enum).
5527 Return a tree-list containing the CONST_DECL and its value.
5528 Assignment of sequential values by default is handled here. */
5531 build_enumerator (tree name
, tree value
)
5535 /* Validate and default VALUE. */
5537 /* Remove no-op casts from the value. */
5539 STRIP_TYPE_NOPS (value
);
5543 /* Don't issue more errors for error_mark_node (i.e. an
5544 undeclared identifier) - just ignore the value expression. */
5545 if (value
== error_mark_node
)
5547 else if (TREE_CODE (value
) != INTEGER_CST
)
5549 error ("enumerator value for %qE is not an integer constant", name
);
5554 value
= default_conversion (value
);
5555 constant_expression_warning (value
);
5559 /* Default based on previous value. */
5560 /* It should no longer be possible to have NON_LVALUE_EXPR
5564 value
= enum_next_value
;
5566 error ("overflow in enumeration values");
5569 if (pedantic
&& !int_fits_type_p (value
, integer_type_node
))
5571 pedwarn ("ISO C restricts enumerator values to range of %<int%>");
5572 /* XXX This causes -pedantic to change the meaning of the program.
5573 Remove? -zw 2004-03-15 */
5574 value
= convert (integer_type_node
, value
);
5577 /* Set basis for default for next value. */
5578 enum_next_value
= build_binary_op (PLUS_EXPR
, value
, integer_one_node
, 0);
5579 enum_overflow
= tree_int_cst_lt (enum_next_value
, value
);
5581 /* Now create a declaration for the enum value name. */
5583 type
= TREE_TYPE (value
);
5584 type
= c_common_type_for_size (MAX (TYPE_PRECISION (type
),
5585 TYPE_PRECISION (integer_type_node
)),
5586 (TYPE_PRECISION (type
)
5587 >= TYPE_PRECISION (integer_type_node
)
5588 && TYPE_UNSIGNED (type
)));
5590 decl
= build_decl (CONST_DECL
, name
, type
);
5591 DECL_INITIAL (decl
) = convert (type
, value
);
5594 return tree_cons (decl
, value
, NULL_TREE
);
5598 /* Create the FUNCTION_DECL for a function definition.
5599 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
5600 the declaration; they describe the function's name and the type it returns,
5601 but twisted together in a fashion that parallels the syntax of C.
5603 This function creates a binding context for the function body
5604 as well as setting up the FUNCTION_DECL in current_function_decl.
5606 Returns 1 on success. If the DECLARATOR is not suitable for a function
5607 (it defines a datum instead), we return 0, which tells
5608 yyparse to report a parse error. */
5611 start_function (struct c_declspecs
*declspecs
, struct c_declarator
*declarator
,
5614 tree decl1
, old_decl
;
5615 tree restype
, resdecl
;
5617 current_function_returns_value
= 0; /* Assume, until we see it does. */
5618 current_function_returns_null
= 0;
5619 current_function_returns_abnormally
= 0;
5620 warn_about_return_type
= 0;
5621 current_extern_inline
= 0;
5622 c_switch_stack
= NULL
;
5624 /* Indicate no valid break/continue context by setting these variables
5625 to some non-null, non-label value. We'll notice and emit the proper
5626 error message in c_finish_bc_stmt. */
5627 c_break_label
= c_cont_label
= size_zero_node
;
5629 decl1
= grokdeclarator (declarator
, declspecs
, FUNCDEF
, true, NULL
);
5631 /* If the declarator is not suitable for a function definition,
5632 cause a syntax error. */
5636 decl_attributes (&decl1
, attributes
, 0);
5638 if (DECL_DECLARED_INLINE_P (decl1
)
5639 && DECL_UNINLINABLE (decl1
)
5640 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1
)))
5641 warning ("%Jinline function %qD given attribute noinline", decl1
, decl1
);
5643 announce_function (decl1
);
5645 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1
))))
5647 error ("return type is an incomplete type");
5648 /* Make it return void instead. */
5650 = build_function_type (void_type_node
,
5651 TYPE_ARG_TYPES (TREE_TYPE (decl1
)));
5654 if (warn_about_return_type
)
5655 pedwarn_c99 ("return type defaults to %<int%>");
5657 /* Make the init_value nonzero so pushdecl knows this is not tentative.
5658 error_mark_node is replaced below (in pop_scope) with the BLOCK. */
5659 DECL_INITIAL (decl1
) = error_mark_node
;
5661 /* If this definition isn't a prototype and we had a prototype declaration
5662 before, copy the arg type info from that prototype.
5663 But not if what we had before was a builtin function. */
5664 old_decl
= lookup_name_in_scope (DECL_NAME (decl1
), current_scope
);
5665 if (old_decl
!= 0 && TREE_CODE (TREE_TYPE (old_decl
)) == FUNCTION_TYPE
5666 && !DECL_BUILT_IN (old_decl
)
5667 && comptypes (TREE_TYPE (TREE_TYPE (decl1
)),
5668 TREE_TYPE (TREE_TYPE (old_decl
)))
5669 && TYPE_ARG_TYPES (TREE_TYPE (decl1
)) == 0)
5671 TREE_TYPE (decl1
) = composite_type (TREE_TYPE (old_decl
),
5673 current_function_prototype_locus
= DECL_SOURCE_LOCATION (old_decl
);
5676 /* Optionally warn of old-fashioned def with no previous prototype. */
5677 if (warn_strict_prototypes
5678 && TYPE_ARG_TYPES (TREE_TYPE (decl1
)) == 0
5679 && C_DECL_ISNT_PROTOTYPE (old_decl
))
5680 warning ("function declaration isn%'t a prototype");
5681 /* Optionally warn of any global def with no previous prototype. */
5682 else if (warn_missing_prototypes
5683 && TREE_PUBLIC (decl1
)
5684 && !MAIN_NAME_P (DECL_NAME (decl1
))
5685 && C_DECL_ISNT_PROTOTYPE (old_decl
))
5686 warning ("%Jno previous prototype for %qD", decl1
, decl1
);
5687 /* Optionally warn of any def with no previous prototype
5688 if the function has already been used. */
5689 else if (warn_missing_prototypes
5690 && old_decl
!= 0 && TREE_USED (old_decl
)
5691 && TYPE_ARG_TYPES (TREE_TYPE (old_decl
)) == 0)
5692 warning ("%J%qD was used with no prototype before its definition",
5694 /* Optionally warn of any global def with no previous declaration. */
5695 else if (warn_missing_declarations
5696 && TREE_PUBLIC (decl1
)
5698 && !MAIN_NAME_P (DECL_NAME (decl1
)))
5699 warning ("%Jno previous declaration for %qD", decl1
, decl1
);
5700 /* Optionally warn of any def with no previous declaration
5701 if the function has already been used. */
5702 else if (warn_missing_declarations
5703 && old_decl
!= 0 && TREE_USED (old_decl
)
5704 && C_DECL_IMPLICIT (old_decl
))
5705 warning ("%J%qD was used with no declaration before its definition",
5708 /* This is a definition, not a reference.
5709 So normally clear DECL_EXTERNAL.
5710 However, `extern inline' acts like a declaration
5711 except for defining how to inline. So set DECL_EXTERNAL in that case. */
5712 DECL_EXTERNAL (decl1
) = current_extern_inline
;
5714 /* This function exists in static storage.
5715 (This does not mean `static' in the C sense!) */
5716 TREE_STATIC (decl1
) = 1;
5718 /* A nested function is not global. */
5719 if (current_function_decl
!= 0)
5720 TREE_PUBLIC (decl1
) = 0;
5722 /* This is the earliest point at which we might know the assembler
5723 name of the function. Thus, if it's set before this, die horribly. */
5724 gcc_assert (!DECL_ASSEMBLER_NAME_SET_P (decl1
));
5726 /* If #pragma weak was used, mark the decl weak now. */
5727 if (current_scope
== file_scope
)
5728 maybe_apply_pragma_weak (decl1
);
5730 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
5731 if (warn_main
> 0 && MAIN_NAME_P (DECL_NAME (decl1
)))
5736 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1
)))
5737 != integer_type_node
)
5738 pedwarn ("%Jreturn type of %qD is not %<int%>", decl1
, decl1
);
5740 for (args
= TYPE_ARG_TYPES (TREE_TYPE (decl1
)); args
;
5741 args
= TREE_CHAIN (args
))
5743 tree type
= args
? TREE_VALUE (args
) : 0;
5745 if (type
== void_type_node
)
5752 if (TYPE_MAIN_VARIANT (type
) != integer_type_node
)
5753 pedwarn ("%Jfirst argument of %qD should be %<int%>",
5758 if (TREE_CODE (type
) != POINTER_TYPE
5759 || TREE_CODE (TREE_TYPE (type
)) != POINTER_TYPE
5760 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type
)))
5762 pedwarn ("%Jsecond argument of %qD should be %<char **%>",
5767 if (TREE_CODE (type
) != POINTER_TYPE
5768 || TREE_CODE (TREE_TYPE (type
)) != POINTER_TYPE
5769 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type
)))
5771 pedwarn ("%Jthird argument of %qD should probably be "
5772 "%<char **%>", decl1
, decl1
);
5777 /* It is intentional that this message does not mention the third
5778 argument because it's only mentioned in an appendix of the
5780 if (argct
> 0 && (argct
< 2 || argct
> 3))
5781 pedwarn ("%J%qD takes only zero or two arguments", decl1
, decl1
);
5783 if (!TREE_PUBLIC (decl1
))
5784 pedwarn ("%J%qD is normally a non-static function", decl1
, decl1
);
5787 /* Record the decl so that the function name is defined.
5788 If we already have a decl for this name, and it is a FUNCTION_DECL,
5789 use the old decl. */
5791 current_function_decl
= pushdecl (decl1
);
5794 declare_parm_level ();
5796 restype
= TREE_TYPE (TREE_TYPE (current_function_decl
));
5797 /* Promote the value to int before returning it. */
5798 if (c_promoting_integer_type_p (restype
))
5800 /* It retains unsignedness if not really getting wider. */
5801 if (TYPE_UNSIGNED (restype
)
5802 && (TYPE_PRECISION (restype
)
5803 == TYPE_PRECISION (integer_type_node
)))
5804 restype
= unsigned_type_node
;
5806 restype
= integer_type_node
;
5809 resdecl
= build_decl (RESULT_DECL
, NULL_TREE
, restype
);
5810 DECL_ARTIFICIAL (resdecl
) = 1;
5811 DECL_IGNORED_P (resdecl
) = 1;
5812 DECL_RESULT (current_function_decl
) = resdecl
;
5814 start_fname_decls ();
5819 /* Subroutine of store_parm_decls which handles new-style function
5820 definitions (prototype format). The parms already have decls, so we
5821 need only record them as in effect and complain if any redundant
5822 old-style parm decls were written. */
5824 store_parm_decls_newstyle (tree fndecl
, const struct c_arg_info
*arg_info
)
5828 if (current_scope
->bindings
)
5830 error ("%Jold-style parameter declarations in prototyped "
5831 "function definition", fndecl
);
5833 /* Get rid of the old-style declarations. */
5837 /* Don't issue this warning for nested functions, and don't issue this
5838 warning if we got here because ARG_INFO_TYPES was error_mark_node
5839 (this happens when a function definition has just an ellipsis in
5840 its parameter list). */
5841 else if (warn_traditional
&& !in_system_header
&& !current_function_scope
5842 && arg_info
->types
!= error_mark_node
)
5843 warning ("%Jtraditional C rejects ISO C style function definitions",
5846 /* Now make all the parameter declarations visible in the function body.
5847 We can bypass most of the grunt work of pushdecl. */
5848 for (decl
= arg_info
->parms
; decl
; decl
= TREE_CHAIN (decl
))
5850 DECL_CONTEXT (decl
) = current_function_decl
;
5851 if (DECL_NAME (decl
))
5852 bind (DECL_NAME (decl
), decl
, current_scope
,
5853 /*invisible=*/false, /*nested=*/false);
5855 error ("%Jparameter name omitted", decl
);
5858 /* Record the parameter list in the function declaration. */
5859 DECL_ARGUMENTS (fndecl
) = arg_info
->parms
;
5861 /* Now make all the ancillary declarations visible, likewise. */
5862 for (decl
= arg_info
->others
; decl
; decl
= TREE_CHAIN (decl
))
5864 DECL_CONTEXT (decl
) = current_function_decl
;
5865 if (DECL_NAME (decl
))
5866 bind (DECL_NAME (decl
), decl
, current_scope
,
5867 /*invisible=*/false, /*nested=*/false);
5870 /* And all the tag declarations. */
5871 for (decl
= arg_info
->tags
; decl
; decl
= TREE_CHAIN (decl
))
5872 if (TREE_PURPOSE (decl
))
5873 bind (TREE_PURPOSE (decl
), TREE_VALUE (decl
), current_scope
,
5874 /*invisible=*/false, /*nested=*/false);
5877 /* Subroutine of store_parm_decls which handles old-style function
5878 definitions (separate parameter list and declarations). */
5881 store_parm_decls_oldstyle (tree fndecl
, const struct c_arg_info
*arg_info
)
5883 struct c_binding
*b
;
5884 tree parm
, decl
, last
;
5885 tree parmids
= arg_info
->parms
;
5887 /* We use DECL_WEAK as a flag to show which parameters have been
5888 seen already, since it is not used on PARM_DECL. */
5889 #ifdef ENABLE_CHECKING
5890 for (b
= current_scope
->bindings
; b
; b
= b
->prev
)
5891 gcc_assert (TREE_CODE (b
->decl
) != PARM_DECL
|| !DECL_WEAK (b
->decl
));
5894 if (warn_old_style_definition
&& !in_system_header
)
5895 warning ("%Jold-style function definition", fndecl
);
5897 /* Match each formal parameter name with its declaration. Save each
5898 decl in the appropriate TREE_PURPOSE slot of the parmids chain. */
5899 for (parm
= parmids
; parm
; parm
= TREE_CHAIN (parm
))
5901 if (TREE_VALUE (parm
) == 0)
5903 error ("%Jparameter name missing from parameter list", fndecl
);
5904 TREE_PURPOSE (parm
) = 0;
5908 b
= I_SYMBOL_BINDING (TREE_VALUE (parm
));
5909 if (b
&& B_IN_CURRENT_SCOPE (b
))
5912 /* If we got something other than a PARM_DECL it is an error. */
5913 if (TREE_CODE (decl
) != PARM_DECL
)
5914 error ("%J%qD declared as a non-parameter", decl
, decl
);
5915 /* If the declaration is already marked, we have a duplicate
5916 name. Complain and ignore the duplicate. */
5917 else if (DECL_WEAK (decl
))
5919 error ("%Jmultiple parameters named %qD", decl
, decl
);
5920 TREE_PURPOSE (parm
) = 0;
5923 /* If the declaration says "void", complain and turn it into
5925 else if (VOID_TYPE_P (TREE_TYPE (decl
)))
5927 error ("%Jparameter %qD declared with void type", decl
, decl
);
5928 TREE_TYPE (decl
) = integer_type_node
;
5929 DECL_ARG_TYPE (decl
) = integer_type_node
;
5930 layout_decl (decl
, 0);
5933 /* If no declaration found, default to int. */
5936 decl
= build_decl (PARM_DECL
, TREE_VALUE (parm
), integer_type_node
);
5937 DECL_ARG_TYPE (decl
) = TREE_TYPE (decl
);
5938 DECL_SOURCE_LOCATION (decl
) = DECL_SOURCE_LOCATION (fndecl
);
5942 pedwarn ("%Jtype of %qD defaults to %<int%>", decl
, decl
);
5943 else if (extra_warnings
)
5944 warning ("%Jtype of %qD defaults to %<int%>", decl
, decl
);
5947 TREE_PURPOSE (parm
) = decl
;
5948 DECL_WEAK (decl
) = 1;
5951 /* Now examine the parms chain for incomplete declarations
5952 and declarations with no corresponding names. */
5954 for (b
= current_scope
->bindings
; b
; b
= b
->prev
)
5957 if (TREE_CODE (parm
) != PARM_DECL
)
5960 if (!COMPLETE_TYPE_P (TREE_TYPE (parm
)))
5962 error ("%Jparameter %qD has incomplete type", parm
, parm
);
5963 TREE_TYPE (parm
) = error_mark_node
;
5966 if (!DECL_WEAK (parm
))
5968 error ("%Jdeclaration for parameter %qD but no such parameter",
5971 /* Pretend the parameter was not missing.
5972 This gets us to a standard state and minimizes
5973 further error messages. */
5974 parmids
= chainon (parmids
, tree_cons (parm
, 0, 0));
5978 /* Chain the declarations together in the order of the list of
5979 names. Store that chain in the function decl, replacing the
5980 list of names. Update the current scope to match. */
5981 DECL_ARGUMENTS (fndecl
) = 0;
5983 for (parm
= parmids
; parm
; parm
= TREE_CHAIN (parm
))
5984 if (TREE_PURPOSE (parm
))
5986 if (parm
&& TREE_PURPOSE (parm
))
5988 last
= TREE_PURPOSE (parm
);
5989 DECL_ARGUMENTS (fndecl
) = last
;
5990 DECL_WEAK (last
) = 0;
5992 for (parm
= TREE_CHAIN (parm
); parm
; parm
= TREE_CHAIN (parm
))
5993 if (TREE_PURPOSE (parm
))
5995 TREE_CHAIN (last
) = TREE_PURPOSE (parm
);
5996 last
= TREE_PURPOSE (parm
);
5997 DECL_WEAK (last
) = 0;
5999 TREE_CHAIN (last
) = 0;
6002 /* If there was a previous prototype,
6003 set the DECL_ARG_TYPE of each argument according to
6004 the type previously specified, and report any mismatches. */
6006 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl
)))
6009 for (parm
= DECL_ARGUMENTS (fndecl
),
6010 type
= TYPE_ARG_TYPES (TREE_TYPE (fndecl
));
6011 parm
|| (type
&& (TYPE_MAIN_VARIANT (TREE_VALUE (type
))
6012 != void_type_node
));
6013 parm
= TREE_CHAIN (parm
), type
= TREE_CHAIN (type
))
6015 if (parm
== 0 || type
== 0
6016 || TYPE_MAIN_VARIANT (TREE_VALUE (type
)) == void_type_node
)
6018 error ("number of arguments doesn%'t match prototype");
6019 error ("%Hprototype declaration",
6020 ¤t_function_prototype_locus
);
6023 /* Type for passing arg must be consistent with that
6024 declared for the arg. ISO C says we take the unqualified
6025 type for parameters declared with qualified type. */
6026 if (!comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm
)),
6027 TYPE_MAIN_VARIANT (TREE_VALUE (type
))))
6029 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm
))
6030 == TYPE_MAIN_VARIANT (TREE_VALUE (type
)))
6032 /* Adjust argument to match prototype. E.g. a previous
6033 `int foo(float);' prototype causes
6034 `int foo(x) float x; {...}' to be treated like
6035 `int foo(float x) {...}'. This is particularly
6036 useful for argument types like uid_t. */
6037 DECL_ARG_TYPE (parm
) = TREE_TYPE (parm
);
6039 if (targetm
.calls
.promote_prototypes (TREE_TYPE (current_function_decl
))
6040 && INTEGRAL_TYPE_P (TREE_TYPE (parm
))
6041 && TYPE_PRECISION (TREE_TYPE (parm
))
6042 < TYPE_PRECISION (integer_type_node
))
6043 DECL_ARG_TYPE (parm
) = integer_type_node
;
6047 pedwarn ("promoted argument %qD "
6048 "doesn%'t match prototype", parm
);
6049 pedwarn ("%Hprototype declaration",
6050 ¤t_function_prototype_locus
);
6055 error ("argument %qD doesn%'t match prototype", parm
);
6056 error ("%Hprototype declaration",
6057 ¤t_function_prototype_locus
);
6061 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl
)) = 0;
6064 /* Otherwise, create a prototype that would match. */
6068 tree actual
= 0, last
= 0, type
;
6070 for (parm
= DECL_ARGUMENTS (fndecl
); parm
; parm
= TREE_CHAIN (parm
))
6072 type
= tree_cons (NULL_TREE
, DECL_ARG_TYPE (parm
), NULL_TREE
);
6074 TREE_CHAIN (last
) = type
;
6079 type
= tree_cons (NULL_TREE
, void_type_node
, NULL_TREE
);
6081 TREE_CHAIN (last
) = type
;
6085 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6086 of the type of this function, but we need to avoid having this
6087 affect the types of other similarly-typed functions, so we must
6088 first force the generation of an identical (but separate) type
6089 node for the relevant function type. The new node we create
6090 will be a variant of the main variant of the original function
6093 TREE_TYPE (fndecl
) = build_variant_type_copy (TREE_TYPE (fndecl
));
6095 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl
)) = actual
;
6099 /* Store parameter declarations passed in ARG_INFO into the current
6100 function declaration. */
6103 store_parm_decls_from (struct c_arg_info
*arg_info
)
6105 current_function_arg_info
= arg_info
;
6106 store_parm_decls ();
6109 /* Store the parameter declarations into the current function declaration.
6110 This is called after parsing the parameter declarations, before
6111 digesting the body of the function.
6113 For an old-style definition, construct a prototype out of the old-style
6114 parameter declarations and inject it into the function's type. */
6117 store_parm_decls (void)
6119 tree fndecl
= current_function_decl
;
6122 /* The argument information block for FNDECL. */
6123 struct c_arg_info
*arg_info
= current_function_arg_info
;
6124 current_function_arg_info
= 0;
6126 /* True if this definition is written with a prototype. Note:
6127 despite C99 6.7.5.3p14, we can *not* treat an empty argument
6128 list in a function definition as equivalent to (void) -- an
6129 empty argument list specifies the function has no parameters,
6130 but only (void) sets up a prototype for future calls. */
6131 proto
= arg_info
->types
!= 0;
6134 store_parm_decls_newstyle (fndecl
, arg_info
);
6136 store_parm_decls_oldstyle (fndecl
, arg_info
);
6138 /* The next call to push_scope will be a function body. */
6140 next_is_function_body
= true;
6142 /* Write a record describing this function definition to the prototypes
6143 file (if requested). */
6145 gen_aux_info_record (fndecl
, 1, 0, proto
);
6147 /* Initialize the RTL code for the function. */
6148 allocate_struct_function (fndecl
);
6150 /* Begin the statement tree for this function. */
6151 DECL_SAVED_TREE (fndecl
) = push_stmt_list ();
6153 /* ??? Insert the contents of the pending sizes list into the function
6154 to be evaluated. This just changes mis-behavior until assign_parms
6155 phase ordering problems are resolved. */
6158 for (t
= nreverse (get_pending_sizes ()); t
; t
= TREE_CHAIN (t
))
6159 add_stmt (TREE_VALUE (t
));
6162 /* Even though we're inside a function body, we still don't want to
6163 call expand_expr to calculate the size of a variable-sized array.
6164 We haven't necessarily assigned RTL to all variables yet, so it's
6165 not safe to try to expand expressions involving them. */
6166 cfun
->x_dont_save_pending_sizes_p
= 1;
6169 /* Handle attribute((warn_unused_result)) on FNDECL and all its nested
6173 c_warn_unused_result_recursively (tree fndecl
)
6175 struct cgraph_node
*cgn
;
6177 /* Handle attribute((warn_unused_result)). Relies on gimple input. */
6178 c_warn_unused_result (&DECL_SAVED_TREE (fndecl
));
6180 /* Finalize all nested functions now. */
6181 cgn
= cgraph_node (fndecl
);
6182 for (cgn
= cgn
->nested
; cgn
; cgn
= cgn
->next_nested
)
6183 c_warn_unused_result_recursively (cgn
->decl
);
6186 /* Finish up a function declaration and compile that function
6187 all the way to assembler language output. The free the storage
6188 for the function definition.
6190 This is called after parsing the body of the function definition. */
6193 finish_function (void)
6195 tree fndecl
= current_function_decl
;
6197 if (TREE_CODE (fndecl
) == FUNCTION_DECL
6198 && targetm
.calls
.promote_prototypes (TREE_TYPE (fndecl
)))
6200 tree args
= DECL_ARGUMENTS (fndecl
);
6201 for (; args
; args
= TREE_CHAIN (args
))
6203 tree type
= TREE_TYPE (args
);
6204 if (INTEGRAL_TYPE_P (type
)
6205 && TYPE_PRECISION (type
) < TYPE_PRECISION (integer_type_node
))
6206 DECL_ARG_TYPE (args
) = integer_type_node
;
6210 if (DECL_INITIAL (fndecl
) && DECL_INITIAL (fndecl
) != error_mark_node
)
6211 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl
)) = fndecl
;
6213 /* Must mark the RESULT_DECL as being in this function. */
6215 if (DECL_RESULT (fndecl
) && DECL_RESULT (fndecl
) != error_mark_node
)
6216 DECL_CONTEXT (DECL_RESULT (fndecl
)) = fndecl
;
6218 if (MAIN_NAME_P (DECL_NAME (fndecl
)) && flag_hosted
)
6220 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl
)))
6221 != integer_type_node
)
6223 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6224 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6226 pedwarn ("%Jreturn type of %qD is not %<int%>", fndecl
, fndecl
);
6231 c_finish_return (integer_zero_node
);
6235 /* Tie off the statement tree for this function. */
6236 DECL_SAVED_TREE (fndecl
) = pop_stmt_list (DECL_SAVED_TREE (fndecl
));
6238 finish_fname_decls ();
6240 /* Complain if there's just no return statement. */
6241 if (warn_return_type
6242 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl
))) != VOID_TYPE
6243 && !current_function_returns_value
&& !current_function_returns_null
6244 /* Don't complain if we abort. */
6245 && !current_function_returns_abnormally
6246 /* Don't warn for main(). */
6247 && !MAIN_NAME_P (DECL_NAME (fndecl
))
6248 /* Or if they didn't actually specify a return type. */
6249 && !C_FUNCTION_IMPLICIT_INT (fndecl
)
6250 /* Normally, with -Wreturn-type, flow will complain. Unless we're an
6251 inline function, as we might never be compiled separately. */
6252 && DECL_INLINE (fndecl
))
6253 warning ("no return statement in function returning non-void");
6255 /* With just -Wextra, complain only if function returns both with
6256 and without a value. */
6258 && current_function_returns_value
6259 && current_function_returns_null
)
6260 warning ("this function may return with or without a value");
6262 /* Store the end of the function, so that we get good line number
6263 info for the epilogue. */
6264 cfun
->function_end_locus
= input_location
;
6266 /* If we don't have ctors/dtors sections, and this is a static
6267 constructor or destructor, it must be recorded now. */
6268 if (DECL_STATIC_CONSTRUCTOR (fndecl
)
6269 && !targetm
.have_ctors_dtors
)
6270 static_ctors
= tree_cons (NULL_TREE
, fndecl
, static_ctors
);
6271 if (DECL_STATIC_DESTRUCTOR (fndecl
)
6272 && !targetm
.have_ctors_dtors
)
6273 static_dtors
= tree_cons (NULL_TREE
, fndecl
, static_dtors
);
6275 /* Finalize the ELF visibility for the function. */
6276 c_determine_visibility (fndecl
);
6278 /* Genericize before inlining. Delay genericizing nested functions
6279 until their parent function is genericized. Since finalizing
6280 requires GENERIC, delay that as well. */
6282 if (DECL_INITIAL (fndecl
) && DECL_INITIAL (fndecl
) != error_mark_node
)
6284 if (!decl_function_context (fndecl
))
6286 c_genericize (fndecl
);
6287 c_warn_unused_result_recursively (fndecl
);
6289 /* ??? Objc emits functions after finalizing the compilation unit.
6290 This should be cleaned up later and this conditional removed. */
6291 if (cgraph_global_info_ready
)
6293 c_expand_body (fndecl
);
6297 cgraph_finalize_function (fndecl
, false);
6301 /* Register this function with cgraph just far enough to get it
6302 added to our parent's nested function list. Handy, since the
6303 C front end doesn't have such a list. */
6304 (void) cgraph_node (fndecl
);
6308 /* We're leaving the context of this function, so zap cfun.
6309 It's still in DECL_STRUCT_FUNCTION, and we'll restore it in
6310 tree_rest_of_compilation. */
6312 current_function_decl
= NULL
;
6315 /* Generate the RTL for the body of FNDECL. */
6318 c_expand_body (tree fndecl
)
6321 if (!DECL_INITIAL (fndecl
)
6322 || DECL_INITIAL (fndecl
) == error_mark_node
)
6325 tree_rest_of_compilation (fndecl
);
6327 if (DECL_STATIC_CONSTRUCTOR (fndecl
)
6328 && targetm
.have_ctors_dtors
)
6329 targetm
.asm_out
.constructor (XEXP (DECL_RTL (fndecl
), 0),
6330 DEFAULT_INIT_PRIORITY
);
6331 if (DECL_STATIC_DESTRUCTOR (fndecl
)
6332 && targetm
.have_ctors_dtors
)
6333 targetm
.asm_out
.destructor (XEXP (DECL_RTL (fndecl
), 0),
6334 DEFAULT_INIT_PRIORITY
);
6337 /* Check the declarations given in a for-loop for satisfying the C99
6340 check_for_loop_decls (void)
6342 struct c_binding
*b
;
6346 /* If we get here, declarations have been used in a for loop without
6347 the C99 for loop scope. This doesn't make much sense, so don't
6349 error ("%<for%> loop initial declaration used outside C99 mode");
6352 /* C99 subclause 6.8.5 paragraph 3:
6354 [#3] The declaration part of a for statement shall only
6355 declare identifiers for objects having storage class auto or
6358 It isn't clear whether, in this sentence, "identifiers" binds to
6359 "shall only declare" or to "objects" - that is, whether all identifiers
6360 declared must be identifiers for objects, or whether the restriction
6361 only applies to those that are. (A question on this in comp.std.c
6362 in November 2000 received no answer.) We implement the strictest
6363 interpretation, to avoid creating an extension which later causes
6366 for (b
= current_scope
->bindings
; b
; b
= b
->prev
)
6369 tree decl
= b
->decl
;
6374 switch (TREE_CODE (decl
))
6377 if (TREE_STATIC (decl
))
6378 error ("%Jdeclaration of static variable %qD in %<for%> loop "
6379 "initial declaration", decl
, decl
);
6380 else if (DECL_EXTERNAL (decl
))
6381 error ("%Jdeclaration of %<extern%> variable %qD in %<for%> loop "
6382 "initial declaration", decl
, decl
);
6386 error ("%<struct %E%> declared in %<for%> loop initial declaration",
6390 error ("%<union %E%> declared in %<for%> loop initial declaration",
6394 error ("%<enum %E%> declared in %<for%> loop initial declaration",
6398 error ("%Jdeclaration of non-variable %qD in %<for%> loop "
6399 "initial declaration", decl
, decl
);
6404 /* Save and reinitialize the variables
6405 used during compilation of a C function. */
6408 c_push_function_context (struct function
*f
)
6410 struct language_function
*p
;
6411 p
= GGC_NEW (struct language_function
);
6414 p
->base
.x_stmt_tree
= c_stmt_tree
;
6415 p
->x_break_label
= c_break_label
;
6416 p
->x_cont_label
= c_cont_label
;
6417 p
->x_switch_stack
= c_switch_stack
;
6418 p
->arg_info
= current_function_arg_info
;
6419 p
->returns_value
= current_function_returns_value
;
6420 p
->returns_null
= current_function_returns_null
;
6421 p
->returns_abnormally
= current_function_returns_abnormally
;
6422 p
->warn_about_return_type
= warn_about_return_type
;
6423 p
->extern_inline
= current_extern_inline
;
6426 /* Restore the variables used during compilation of a C function. */
6429 c_pop_function_context (struct function
*f
)
6431 struct language_function
*p
= f
->language
;
6433 if (DECL_STRUCT_FUNCTION (current_function_decl
) == 0
6434 && DECL_SAVED_TREE (current_function_decl
) == NULL_TREE
)
6436 /* Stop pointing to the local nodes about to be freed. */
6437 /* But DECL_INITIAL must remain nonzero so we know this
6438 was an actual function definition. */
6439 DECL_INITIAL (current_function_decl
) = error_mark_node
;
6440 DECL_ARGUMENTS (current_function_decl
) = 0;
6443 c_stmt_tree
= p
->base
.x_stmt_tree
;
6444 c_break_label
= p
->x_break_label
;
6445 c_cont_label
= p
->x_cont_label
;
6446 c_switch_stack
= p
->x_switch_stack
;
6447 current_function_arg_info
= p
->arg_info
;
6448 current_function_returns_value
= p
->returns_value
;
6449 current_function_returns_null
= p
->returns_null
;
6450 current_function_returns_abnormally
= p
->returns_abnormally
;
6451 warn_about_return_type
= p
->warn_about_return_type
;
6452 current_extern_inline
= p
->extern_inline
;
6457 /* Copy the DECL_LANG_SPECIFIC data associated with DECL. */
6460 c_dup_lang_specific_decl (tree decl
)
6462 struct lang_decl
*ld
;
6464 if (!DECL_LANG_SPECIFIC (decl
))
6467 ld
= GGC_NEW (struct lang_decl
);
6468 memcpy (ld
, DECL_LANG_SPECIFIC (decl
), sizeof (struct lang_decl
));
6469 DECL_LANG_SPECIFIC (decl
) = ld
;
6472 /* The functions below are required for functionality of doing
6473 function at once processing in the C front end. Currently these
6474 functions are not called from anywhere in the C front end, but as
6475 these changes continue, that will change. */
6477 /* Returns nonzero if the current statement is a full expression,
6478 i.e. temporaries created during that statement should be destroyed
6479 at the end of the statement. */
6482 stmts_are_full_exprs_p (void)
6487 /* Returns the stmt_tree (if any) to which statements are currently
6488 being added. If there is no active statement-tree, NULL is
6492 current_stmt_tree (void)
6494 return &c_stmt_tree
;
6497 /* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
6501 anon_aggr_type_p (tree
ARG_UNUSED (node
))
6506 /* Return the global value of T as a symbol. */
6509 identifier_global_value (tree t
)
6511 struct c_binding
*b
;
6513 for (b
= I_SYMBOL_BINDING (t
); b
; b
= b
->shadowed
)
6514 if (B_IN_FILE_SCOPE (b
) || B_IN_EXTERNAL_SCOPE (b
))
6520 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
6521 otherwise the name is found in ridpointers from RID_INDEX. */
6524 record_builtin_type (enum rid rid_index
, const char *name
, tree type
)
6528 id
= ridpointers
[(int) rid_index
];
6530 id
= get_identifier (name
);
6531 decl
= build_decl (TYPE_DECL
, id
, type
);
6533 if (debug_hooks
->type_decl
)
6534 debug_hooks
->type_decl (decl
, false);
6537 /* Build the void_list_node (void_type_node having been created). */
6539 build_void_list_node (void)
6541 tree t
= build_tree_list (NULL_TREE
, void_type_node
);
6545 /* Return a c_parm structure with the given SPECS, ATTRS and DECLARATOR. */
6548 build_c_parm (struct c_declspecs
*specs
, tree attrs
,
6549 struct c_declarator
*declarator
)
6551 struct c_parm
*ret
= XOBNEW (&parser_obstack
, struct c_parm
);
6554 ret
->declarator
= declarator
;
6558 /* Return a declarator with nested attributes. TARGET is the inner
6559 declarator to which these attributes apply. ATTRS are the
6562 struct c_declarator
*
6563 build_attrs_declarator (tree attrs
, struct c_declarator
*target
)
6565 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
6566 ret
->kind
= cdk_attrs
;
6567 ret
->declarator
= target
;
6568 ret
->u
.attrs
= attrs
;
6572 /* Return a declarator for a function with arguments specified by ARGS
6573 and return type specified by TARGET. */
6575 struct c_declarator
*
6576 build_function_declarator (struct c_arg_info
*args
,
6577 struct c_declarator
*target
)
6579 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
6580 ret
->kind
= cdk_function
;
6581 ret
->declarator
= target
;
6582 ret
->u
.arg_info
= args
;
6586 /* Return a declarator for the identifier IDENT (which may be
6587 NULL_TREE for an abstract declarator). */
6589 struct c_declarator
*
6590 build_id_declarator (tree ident
)
6592 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
6594 ret
->declarator
= 0;
6599 /* Return something to represent absolute declarators containing a *.
6600 TARGET is the absolute declarator that the * contains.
6601 TYPE_QUALS_ATTRS is a structure for type qualifiers and attributes
6602 to apply to the pointer type. */
6604 struct c_declarator
*
6605 make_pointer_declarator (struct c_declspecs
*type_quals_attrs
,
6606 struct c_declarator
*target
)
6610 struct c_declarator
*itarget
= target
;
6611 struct c_declarator
*ret
= XOBNEW (&parser_obstack
, struct c_declarator
);
6612 if (type_quals_attrs
)
6614 attrs
= type_quals_attrs
->attrs
;
6615 quals
= quals_from_declspecs (type_quals_attrs
);
6616 if (attrs
!= NULL_TREE
)
6617 itarget
= build_attrs_declarator (attrs
, target
);
6619 ret
->kind
= cdk_pointer
;
6620 ret
->declarator
= itarget
;
6621 ret
->u
.pointer_quals
= quals
;
6625 /* Return a pointer to a structure for an empty list of declaration
6628 struct c_declspecs
*
6629 build_null_declspecs (void)
6631 struct c_declspecs
*ret
= XOBNEW (&parser_obstack
, struct c_declspecs
);
6635 ret
->typespec_word
= cts_none
;
6636 ret
->storage_class
= csc_none
;
6637 ret
->non_sc_seen_p
= false;
6638 ret
->typedef_p
= false;
6639 ret
->explicit_signed_p
= false;
6640 ret
->deprecated_p
= false;
6641 ret
->default_int_p
= false;
6642 ret
->long_p
= false;
6643 ret
->long_long_p
= false;
6644 ret
->short_p
= false;
6645 ret
->signed_p
= false;
6646 ret
->unsigned_p
= false;
6647 ret
->complex_p
= false;
6648 ret
->inline_p
= false;
6649 ret
->thread_p
= false;
6650 ret
->const_p
= false;
6651 ret
->volatile_p
= false;
6652 ret
->restrict_p
= false;
6656 /* Add the type qualifier QUAL to the declaration specifiers SPECS,
6659 struct c_declspecs
*
6660 declspecs_add_qual (struct c_declspecs
*specs
, tree qual
)
6664 specs
->non_sc_seen_p
= true;
6665 gcc_assert (TREE_CODE (qual
) == IDENTIFIER_NODE
6666 && C_IS_RESERVED_WORD (qual
));
6667 i
= C_RID_CODE (qual
);
6671 dupe
= specs
->const_p
;
6672 specs
->const_p
= true;
6675 dupe
= specs
->volatile_p
;
6676 specs
->volatile_p
= true;
6679 dupe
= specs
->restrict_p
;
6680 specs
->restrict_p
= true;
6685 if (dupe
&& pedantic
&& !flag_isoc99
)
6686 pedwarn ("duplicate %qs", IDENTIFIER_POINTER (qual
));
6690 /* Add the type specifier TYPE to the declaration specifiers SPECS,
6693 struct c_declspecs
*
6694 declspecs_add_type (struct c_declspecs
*specs
, tree type
)
6696 specs
->non_sc_seen_p
= true;
6697 if (TREE_DEPRECATED (type
))
6698 specs
->deprecated_p
= true;
6700 /* Handle type specifier keywords. */
6701 if (TREE_CODE (type
) == IDENTIFIER_NODE
&& C_IS_RESERVED_WORD (type
))
6703 enum rid i
= C_RID_CODE (type
);
6706 error ("two or more data types in declaration specifiers");
6709 if ((int) i
<= (int) RID_LAST_MODIFIER
)
6711 /* "long", "short", "signed", "unsigned" or "_Complex". */
6716 if (specs
->long_long_p
)
6718 error ("%<long long long%> is too long for GCC");
6723 if (specs
->typespec_word
== cts_double
)
6725 error ("both %<long long%> and %<double%> in "
6726 "declaration specifiers");
6729 if (pedantic
&& !flag_isoc99
&& !in_system_header
6731 pedwarn ("ISO C90 does not support %<long long%>");
6732 specs
->long_long_p
= 1;
6736 error ("both %<long%> and %<short%> in "
6737 "declaration specifiers");
6738 else if (specs
->typespec_word
== cts_void
)
6739 error ("both %<long%> and %<void%> in "
6740 "declaration specifiers");
6741 else if (specs
->typespec_word
== cts_bool
)
6742 error ("both %<long%> and %<_Bool%> in "
6743 "declaration specifiers");
6744 else if (specs
->typespec_word
== cts_char
)
6745 error ("both %<long%> and %<char%> in "
6746 "declaration specifiers");
6747 else if (specs
->typespec_word
== cts_float
)
6748 error ("both %<long%> and %<float%> in "
6749 "declaration specifiers");
6751 specs
->long_p
= true;
6754 dupe
= specs
->short_p
;
6756 error ("both %<long%> and %<short%> in "
6757 "declaration specifiers");
6758 else if (specs
->typespec_word
== cts_void
)
6759 error ("both %<short%> and %<void%> in "
6760 "declaration specifiers");
6761 else if (specs
->typespec_word
== cts_bool
)
6762 error ("both %<short%> and %<_Bool%> in "
6763 "declaration specifiers");
6764 else if (specs
->typespec_word
== cts_char
)
6765 error ("both %<short%> and %<char%> in "
6766 "declaration specifiers");
6767 else if (specs
->typespec_word
== cts_float
)
6768 error ("both %<short%> and %<float%> in "
6769 "declaration specifiers");
6770 else if (specs
->typespec_word
== cts_double
)
6771 error ("both %<short%> and %<double%> in "
6772 "declaration specifiers");
6774 specs
->short_p
= true;
6777 dupe
= specs
->signed_p
;
6778 if (specs
->unsigned_p
)
6779 error ("both %<signed%> and %<unsigned%> in "
6780 "declaration specifiers");
6781 else if (specs
->typespec_word
== cts_void
)
6782 error ("both %<signed%> and %<void%> in "
6783 "declaration specifiers");
6784 else if (specs
->typespec_word
== cts_bool
)
6785 error ("both %<signed%> and %<_Bool%> in "
6786 "declaration specifiers");
6787 else if (specs
->typespec_word
== cts_float
)
6788 error ("both %<signed%> and %<float%> in "
6789 "declaration specifiers");
6790 else if (specs
->typespec_word
== cts_double
)
6791 error ("both %<signed%> and %<double%> in "
6792 "declaration specifiers");
6794 specs
->signed_p
= true;
6797 dupe
= specs
->unsigned_p
;
6798 if (specs
->signed_p
)
6799 error ("both %<signed%> and %<unsigned%> in "
6800 "declaration specifiers");
6801 else if (specs
->typespec_word
== cts_void
)
6802 error ("both %<unsigned%> and %<void%> in "
6803 "declaration specifiers");
6804 else if (specs
->typespec_word
== cts_bool
)
6805 error ("both %<unsigned%> and %<_Bool%> in "
6806 "declaration specifiers");
6807 else if (specs
->typespec_word
== cts_float
)
6808 error ("both %<unsigned%> and %<float%> in "
6809 "declaration specifiers");
6810 else if (specs
->typespec_word
== cts_double
)
6811 error ("both %<unsigned%> and %<double%> in "
6812 "declaration specifiers");
6814 specs
->unsigned_p
= true;
6817 dupe
= specs
->complex_p
;
6818 if (pedantic
&& !flag_isoc99
)
6819 pedwarn ("ISO C90 does not support complex types");
6820 if (specs
->typespec_word
== cts_void
)
6821 error ("both %<complex%> and %<void%> in "
6822 "declaration specifiers");
6823 else if (specs
->typespec_word
== cts_bool
)
6824 error ("both %<complex%> and %<_Bool%> in "
6825 "declaration specifiers");
6827 specs
->complex_p
= true;
6834 error ("duplicate %qs", IDENTIFIER_POINTER (type
));
6840 /* "void", "_Bool", "char", "int", "float" or "double". */
6841 if (specs
->typespec_word
!= cts_none
)
6843 error ("two or more data types in declaration specifiers");
6850 error ("both %<long%> and %<void%> in "
6851 "declaration specifiers");
6852 else if (specs
->short_p
)
6853 error ("both %<short%> and %<void%> in "
6854 "declaration specifiers");
6855 else if (specs
->signed_p
)
6856 error ("both %<signed%> and %<void%> in "
6857 "declaration specifiers");
6858 else if (specs
->unsigned_p
)
6859 error ("both %<unsigned%> and %<void%> in "
6860 "declaration specifiers");
6861 else if (specs
->complex_p
)
6862 error ("both %<complex%> and %<void%> in "
6863 "declaration specifiers");
6865 specs
->typespec_word
= cts_void
;
6869 error ("both %<long%> and %<_Bool%> in "
6870 "declaration specifiers");
6871 else if (specs
->short_p
)
6872 error ("both %<short%> and %<_Bool%> in "
6873 "declaration specifiers");
6874 else if (specs
->signed_p
)
6875 error ("both %<signed%> and %<_Bool%> in "
6876 "declaration specifiers");
6877 else if (specs
->unsigned_p
)
6878 error ("both %<unsigned%> and %<_Bool%> in "
6879 "declaration specifiers");
6880 else if (specs
->complex_p
)
6881 error ("both %<complex%> and %<_Bool%> in "
6882 "declaration specifiers");
6884 specs
->typespec_word
= cts_bool
;
6888 error ("both %<long%> and %<char%> in "
6889 "declaration specifiers");
6890 else if (specs
->short_p
)
6891 error ("both %<short%> and %<char%> in "
6892 "declaration specifiers");
6894 specs
->typespec_word
= cts_char
;
6897 specs
->typespec_word
= cts_int
;
6901 error ("both %<long%> and %<float%> in "
6902 "declaration specifiers");
6903 else if (specs
->short_p
)
6904 error ("both %<short%> and %<float%> in "
6905 "declaration specifiers");
6906 else if (specs
->signed_p
)
6907 error ("both %<signed%> and %<float%> in "
6908 "declaration specifiers");
6909 else if (specs
->unsigned_p
)
6910 error ("both %<unsigned%> and %<float%> in "
6911 "declaration specifiers");
6913 specs
->typespec_word
= cts_float
;
6916 if (specs
->long_long_p
)
6917 error ("both %<long long%> and %<double%> in "
6918 "declaration specifiers");
6919 else if (specs
->short_p
)
6920 error ("both %<short%> and %<double%> in "
6921 "declaration specifiers");
6922 else if (specs
->signed_p
)
6923 error ("both %<signed%> and %<double%> in "
6924 "declaration specifiers");
6925 else if (specs
->unsigned_p
)
6926 error ("both %<unsigned%> and %<double%> in "
6927 "declaration specifiers");
6929 specs
->typespec_word
= cts_double
;
6932 /* ObjC reserved word "id", handled below. */
6938 /* Now we have a typedef (a TYPE_DECL node), an identifier (some
6939 form of ObjC type, cases such as "int" and "long" being handled
6940 above), a TYPE (struct, union, enum and typeof specifiers) or an
6941 ERROR_MARK. In none of these cases may there have previously
6942 been any type specifiers. */
6943 if (specs
->type
|| specs
->typespec_word
!= cts_none
6944 || specs
->long_p
|| specs
->short_p
|| specs
->signed_p
6945 || specs
->unsigned_p
|| specs
->complex_p
)
6946 error ("two or more data types in declaration specifiers");
6947 else if (TREE_CODE (type
) == TYPE_DECL
)
6949 if (TREE_TYPE (type
) == error_mark_node
)
6950 ; /* Allow the type to default to int to avoid cascading errors. */
6953 specs
->type
= TREE_TYPE (type
);
6954 specs
->decl_attr
= DECL_ATTRIBUTES (type
);
6955 specs
->typedef_p
= true;
6956 specs
->explicit_signed_p
= C_TYPEDEF_EXPLICITLY_SIGNED (type
);
6959 else if (TREE_CODE (type
) == IDENTIFIER_NODE
)
6961 tree t
= lookup_name (type
);
6962 if (!t
|| TREE_CODE (t
) != TYPE_DECL
)
6963 error ("%qs fails to be a typedef or built in type",
6964 IDENTIFIER_POINTER (type
));
6965 else if (TREE_TYPE (t
) == error_mark_node
)
6968 specs
->type
= TREE_TYPE (t
);
6970 else if (TREE_CODE (type
) != ERROR_MARK
)
6976 /* Add the storage class specifier or function specifier SCSPEC to the
6977 declaration specifiers SPECS, returning SPECS. */
6979 struct c_declspecs
*
6980 declspecs_add_scspec (struct c_declspecs
*specs
, tree scspec
)
6983 enum c_storage_class n
= csc_none
;
6985 gcc_assert (TREE_CODE (scspec
) == IDENTIFIER_NODE
6986 && C_IS_RESERVED_WORD (scspec
));
6987 i
= C_RID_CODE (scspec
);
6988 if (extra_warnings
&& specs
->non_sc_seen_p
)
6989 warning ("%qs is not at beginning of declaration",
6990 IDENTIFIER_POINTER (scspec
));
6994 /* C99 permits duplicate inline. Although of doubtful utility,
6995 it seems simplest to permit it in gnu89 mode as well, as
6996 there is also little utility in maintaining this as a
6997 difference between gnu89 and C99 inline. */
6999 specs
->inline_p
= true;
7002 dupe
= specs
->thread_p
;
7003 if (specs
->storage_class
== csc_auto
)
7004 error ("%<__thread%> used with %<auto%>");
7005 else if (specs
->storage_class
== csc_register
)
7006 error ("%<__thread%> used with %<register%>");
7007 else if (specs
->storage_class
== csc_typedef
)
7008 error ("%<__thread%> used with %<typedef%>");
7010 specs
->thread_p
= true;
7017 /* Diagnose "__thread extern". */
7018 if (specs
->thread_p
)
7019 error ("%<__thread%> before %<extern%>");
7026 /* Diagnose "__thread static". */
7027 if (specs
->thread_p
)
7028 error ("%<__thread%> before %<static%>");
7036 if (n
!= csc_none
&& n
== specs
->storage_class
)
7039 error ("duplicate %qs", IDENTIFIER_POINTER (scspec
));
7042 if (specs
->storage_class
!= csc_none
&& n
!= specs
->storage_class
)
7044 error ("multiple storage classes in declaration specifiers");
7048 specs
->storage_class
= n
;
7049 if (n
!= csc_extern
&& n
!= csc_static
&& specs
->thread_p
)
7051 error ("%<__thread%> used with %qs",
7052 IDENTIFIER_POINTER (scspec
));
7053 specs
->thread_p
= false;
7060 /* Add the attributes ATTRS to the declaration specifiers SPECS,
7063 struct c_declspecs
*
7064 declspecs_add_attrs (struct c_declspecs
*specs
, tree attrs
)
7066 specs
->attrs
= chainon (attrs
, specs
->attrs
);
7070 /* Combine "long", "short", "signed", "unsigned" and "_Complex" type
7071 specifiers with any other type specifier to determine the resulting
7072 type. This is where ISO C checks on complex types are made, since
7073 "_Complex long" is a prefix of the valid ISO C type "_Complex long
7076 struct c_declspecs
*
7077 finish_declspecs (struct c_declspecs
*specs
)
7079 /* If a type was specified as a whole, we have no modifiers and are
7081 if (specs
->type
!= NULL_TREE
)
7083 gcc_assert (!specs
->long_p
&& !specs
->long_long_p
&& !specs
->short_p
7084 && !specs
->signed_p
&& !specs
->unsigned_p
7085 && !specs
->complex_p
);
7089 /* If none of "void", "_Bool", "char", "int", "float" or "double"
7090 has been specified, treat it as "int" unless "_Complex" is
7091 present and there are no other specifiers. If we just have
7092 "_Complex", it is equivalent to "_Complex double", but e.g.
7093 "_Complex short" is equivalent to "_Complex short int". */
7094 if (specs
->typespec_word
== cts_none
)
7096 if (specs
->long_p
|| specs
->short_p
7097 || specs
->signed_p
|| specs
->unsigned_p
)
7099 specs
->typespec_word
= cts_int
;
7101 else if (specs
->complex_p
)
7103 specs
->typespec_word
= cts_double
;
7105 pedwarn ("ISO C does not support plain %<complex%> meaning "
7106 "%<double complex%>");
7110 specs
->typespec_word
= cts_int
;
7111 specs
->default_int_p
= true;
7112 /* We don't diagnose this here because grokdeclarator will
7113 give more specific diagnostics according to whether it is
7114 a function definition. */
7118 /* If "signed" was specified, record this to distinguish "int" and
7119 "signed int" in the case of a bit-field with
7120 -funsigned-bitfields. */
7121 specs
->explicit_signed_p
= specs
->signed_p
;
7123 /* Now compute the actual type. */
7124 switch (specs
->typespec_word
)
7127 gcc_assert (!specs
->long_p
&& !specs
->short_p
7128 && !specs
->signed_p
&& !specs
->unsigned_p
7129 && !specs
->complex_p
);
7130 specs
->type
= void_type_node
;
7133 gcc_assert (!specs
->long_p
&& !specs
->short_p
7134 && !specs
->signed_p
&& !specs
->unsigned_p
7135 && !specs
->complex_p
);
7136 specs
->type
= boolean_type_node
;
7139 gcc_assert (!specs
->long_p
&& !specs
->short_p
);
7140 gcc_assert (!(specs
->signed_p
&& specs
->unsigned_p
));
7141 if (specs
->signed_p
)
7142 specs
->type
= signed_char_type_node
;
7143 else if (specs
->unsigned_p
)
7144 specs
->type
= unsigned_char_type_node
;
7146 specs
->type
= char_type_node
;
7147 if (specs
->complex_p
)
7150 pedwarn ("ISO C does not support complex integer types");
7151 specs
->type
= build_complex_type (specs
->type
);
7155 gcc_assert (!(specs
->long_p
&& specs
->short_p
));
7156 gcc_assert (!(specs
->signed_p
&& specs
->unsigned_p
));
7157 if (specs
->long_long_p
)
7158 specs
->type
= (specs
->unsigned_p
7159 ? long_long_unsigned_type_node
7160 : long_long_integer_type_node
);
7161 else if (specs
->long_p
)
7162 specs
->type
= (specs
->unsigned_p
7163 ? long_unsigned_type_node
7164 : long_integer_type_node
);
7165 else if (specs
->short_p
)
7166 specs
->type
= (specs
->unsigned_p
7167 ? short_unsigned_type_node
7168 : short_integer_type_node
);
7170 specs
->type
= (specs
->unsigned_p
7171 ? unsigned_type_node
7172 : integer_type_node
);
7173 if (specs
->complex_p
)
7176 pedwarn ("ISO C does not support complex integer types");
7177 specs
->type
= build_complex_type (specs
->type
);
7181 gcc_assert (!specs
->long_p
&& !specs
->short_p
7182 && !specs
->signed_p
&& !specs
->unsigned_p
);
7183 specs
->type
= (specs
->complex_p
7184 ? complex_float_type_node
7188 gcc_assert (!specs
->long_long_p
&& !specs
->short_p
7189 && !specs
->signed_p
&& !specs
->unsigned_p
);
7192 specs
->type
= (specs
->complex_p
7193 ? complex_long_double_type_node
7194 : long_double_type_node
);
7198 specs
->type
= (specs
->complex_p
7199 ? complex_double_type_node
7200 : double_type_node
);
7210 /* Synthesize a function which calls all the global ctors or global
7211 dtors in this file. This is only used for targets which do not
7212 support .ctors/.dtors sections. FIXME: Migrate into cgraph. */
7214 build_cdtor (int method_type
, tree cdtors
)
7221 for (; cdtors
; cdtors
= TREE_CHAIN (cdtors
))
7222 append_to_statement_list (build_function_call (TREE_VALUE (cdtors
), 0),
7225 cgraph_build_static_cdtor (method_type
, body
, DEFAULT_INIT_PRIORITY
);
7228 /* Perform final processing on one file scope's declarations (or the
7229 external scope's declarations), GLOBALS. */
7231 c_write_global_declarations_1 (tree globals
)
7233 size_t len
= list_length (globals
);
7234 tree
*vec
= XNEWVEC (tree
, len
);
7238 /* Process the decls in the order they were written. */
7239 for (i
= 0, decl
= globals
; i
< len
; i
++, decl
= TREE_CHAIN (decl
))
7242 /* Check for used but undefined static functions using the C
7243 standard's definition of "used", and set TREE_NO_WARNING so
7244 that check_global_declarations doesn't repeat the check. */
7245 if (TREE_CODE (decl
) == FUNCTION_DECL
7246 && DECL_INITIAL (decl
) == 0
7247 && DECL_EXTERNAL (decl
)
7248 && !TREE_PUBLIC (decl
)
7249 && C_DECL_USED (decl
))
7251 pedwarn ("%J%qF used but never defined", decl
, decl
);
7252 TREE_NO_WARNING (decl
) = 1;
7256 wrapup_global_declarations (vec
, len
);
7257 check_global_declarations (vec
, len
);
7263 c_write_global_declarations (void)
7267 /* We don't want to do this if generating a PCH. */
7271 /* Don't waste time on further processing if -fsyntax-only or we've
7272 encountered errors. */
7273 if (flag_syntax_only
|| errorcount
|| sorrycount
|| cpp_errors (parse_in
))
7276 /* Close the external scope. */
7277 ext_block
= pop_scope ();
7279 gcc_assert (!current_scope
);
7281 /* Process all file scopes in this compilation, and the external_scope,
7282 through wrapup_global_declarations and check_global_declarations. */
7283 for (t
= all_translation_units
; t
; t
= TREE_CHAIN (t
))
7284 c_write_global_declarations_1 (BLOCK_VARS (DECL_INITIAL (t
)));
7285 c_write_global_declarations_1 (BLOCK_VARS (ext_block
));
7287 /* Generate functions to call static constructors and destructors
7288 for targets that do not support .ctors/.dtors sections. These
7289 functions have magic names which are detected by collect2. */
7290 build_cdtor ('I', static_ctors
); static_ctors
= 0;
7291 build_cdtor ('D', static_dtors
); static_dtors
= 0;
7293 /* We're done parsing; proceed to optimize and emit assembly.
7294 FIXME: shouldn't be the front end's responsibility to call this. */
7297 /* Presently this has to happen after cgraph_optimize.
7298 FIXME: shouldn't be the front end's responsibility to call this. */
7300 mudflap_finish_file ();
7303 #include "gt-c-decl.h"