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"
56 #include "langhooks-def.h"
58 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
60 { NORMAL
, /* Ordinary declaration */
61 FUNCDEF
, /* Function definition */
62 PARM
, /* Declaration of parm before function body */
63 FIELD
, /* Declaration inside struct or union */
64 TYPENAME
}; /* Typename (inside cast or sizeof) */
67 /* Nonzero if we have seen an invalid cross reference
68 to a struct, union, or enum, but not yet printed the message. */
70 tree pending_invalid_xref
;
71 /* File and line to appear in the eventual error message. */
72 location_t pending_invalid_xref_location
;
74 /* While defining an enum type, this is 1 plus the last enumerator
75 constant value. Note that will do not have to save this or `enum_overflow'
76 around nested function definition since such a definition could only
77 occur in an enum value expression and we don't use these variables in
80 static tree enum_next_value
;
82 /* Nonzero means that there was overflow computing enum_next_value. */
84 static int enum_overflow
;
86 /* Parsing a function declarator leaves a list of parameter names
87 or a chain of parameter decls here. */
89 static tree last_function_parms
;
91 /* ... and a chain of structure and enum types declared in the
94 static tree last_function_parm_tags
;
96 /* ... and a chain of all non-parameter declarations (such as
97 CONST_DECLs from enumerations) here. */
99 static tree last_function_parm_others
;
101 /* After parsing the declarator that starts a function definition,
102 `start_function' puts the list of parameter names or chain of decls here
103 for `store_parm_decls' to find. */
105 static tree current_function_parms
;
107 /* Similar, for last_function_parm_tags. */
109 static tree current_function_parm_tags
;
111 /* And for last_function_parm_others. */
113 static tree current_function_parm_others
;
115 /* Similar, for the file and line that the prototype came from if this is
116 an old-style definition. */
118 static location_t current_function_prototype_locus
;
120 /* The current statement tree. */
122 static GTY(()) struct stmt_tree_s c_stmt_tree
;
124 /* The current scope statement stack. */
126 static GTY(()) tree c_scope_stmt_stack
;
128 /* State saving variables. */
129 int c_in_iteration_stmt
;
132 /* A list of external DECLs that appeared at block scope when there was
133 some other global meaning for that identifier. */
134 static GTY(()) tree truly_local_externals
;
136 /* All the builtins; this is a subset of the entries of global_scope. */
138 static GTY(()) tree first_builtin_decl
;
139 static GTY(()) tree last_builtin_decl
;
141 /* A DECL for the current file-scope context. */
143 static GTY(()) tree current_file_decl
;
145 /* Set to 0 at beginning of a function definition, set to 1 if
146 a return statement that specifies a return value is seen. */
148 int current_function_returns_value
;
150 /* Set to 0 at beginning of a function definition, set to 1 if
151 a return statement with no argument is seen. */
153 int current_function_returns_null
;
155 /* Set to 0 at beginning of a function definition, set to 1 if
156 a call to a noreturn function is seen. */
158 int current_function_returns_abnormally
;
160 /* Set to nonzero by `grokdeclarator' for a function
161 whose return type is defaulted, if warnings for this are desired. */
163 static int warn_about_return_type
;
165 /* Nonzero when starting a function declared `extern inline'. */
167 static int current_extern_inline
;
169 /* Each c_scope structure describes the complete contents of one scope.
170 Three scopes are distinguished specially: the innermost or current
171 scope, the innermost function scope, and the outermost or file scope.
173 Most declarations are recorded in the current scope.
175 All normal label declarations are recorded in the innermost
176 function scope, as are bindings of undeclared identifiers to
177 error_mark_node. (GCC permits nested functions as an extension,
178 hence the 'innermost' qualifier.) Explicitly declared labels
179 (using the __label__ extension) appear in the current scope.
181 Being in the global scope (current_scope == global_scope) causes
182 special behavior in several places below. Also, under some
183 conditions the Objective-C front end records declarations in the
184 global scope even though that isn't the current scope.
186 The order of the names, parms, and blocks lists matters, and they
187 are frequently appended to. To avoid having to walk all the way to
188 the end of the list on each insertion, or reverse the lists later,
189 we maintain a pointer to the last list entry for each of the lists.
191 The order of the tags, shadowed, and shadowed_tags
192 lists does not matter, so we just prepend to these lists. */
194 struct c_scope
GTY(())
196 /* The scope containing this one. */
197 struct c_scope
*outer
;
199 /* The next outermost function scope. */
200 struct c_scope
*outer_function
;
202 /* All variables, constants, functions, labels, and typedef names. */
206 /* All parameter declarations. Used only in the outermost scope of
211 /* All structure, union, and enum type tags. */
214 /* For each scope, a list of shadowed outer-scope definitions
215 to be restored when this scope is popped.
216 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
217 whose TREE_VALUE is its old definition (a kind of ..._DECL node). */
220 /* For each scope, a list of shadowed outer-scope tag definitions
221 to be restored when this scope is popped.
222 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
223 whose TREE_VALUE is its old definition (a kind of ..._TYPE node). */
226 /* For each scope (except the global one), a chain of BLOCK nodes
227 for all the scopes that were entered and exited one level down. */
231 /* True if we are currently filling this scope with parameter
233 BOOL_BITFIELD parm_flag
: 1;
235 /* True if we already complained about forward parameter decls
236 in this scope. This prevents double warnings on
237 foo (int a; int b; ...) */
238 BOOL_BITFIELD warned_forward_parm_decls
: 1;
240 /* True if this is the outermost block scope of a function body.
241 This scope contains the parameters, the local variables declared
242 in the outermost block, and all the labels (except those in
243 nested functions, or declared at block scope with __label__). */
244 BOOL_BITFIELD function_body
: 1;
246 /* True means make a BLOCK for this scope no matter what. */
247 BOOL_BITFIELD keep
: 1;
250 /* The scope currently in effect. */
252 static GTY(()) struct c_scope
*current_scope
;
254 /* A chain of c_scope structures awaiting reuse. */
256 static GTY((deletable (""))) struct c_scope
*scope_freelist
;
258 /* The innermost function scope. Ordinary (not explicitly declared)
259 labels, bindings to error_mark_node, and the lazily-created
260 bindings of __func__ and its friends get this scope. */
262 static GTY(()) struct c_scope
*current_function_scope
;
264 /* The outermost scope, corresponding to the C "file scope". This is
265 created when the compiler is started and exists through the entire run. */
267 static GTY(()) struct c_scope
*global_scope
;
269 /* Append VAR to LIST in scope SCOPE. */
270 #define SCOPE_LIST_APPEND(scope, list, decl) do { \
271 struct c_scope *s_ = (scope); \
273 if (s_->list##_last) \
274 TREE_CHAIN (s_->list##_last) = d_; \
277 s_->list##_last = d_; \
280 /* Concatenate FROM in scope FSCOPE onto TO in scope TSCOPE. */
281 #define SCOPE_LIST_CONCAT(tscope, to, fscope, from) do { \
282 struct c_scope *t_ = (tscope); \
283 struct c_scope *f_ = (fscope); \
285 TREE_CHAIN (t_->to##_last) = f_->from; \
288 t_->to##_last = f_->from##_last; \
291 /* True means unconditionally make a BLOCK for the next scope pushed. */
293 static bool keep_next_level_flag
;
295 /* True means the next call to pushlevel will be the outermost scope
296 of a function body, so do not push a new scope, merely cease
297 expecting parameter decls. */
299 static bool next_is_function_body
;
301 /* Functions called automatically at the beginning and end of execution. */
303 tree static_ctors
, static_dtors
;
305 /* Forward declarations. */
307 static struct c_scope
*make_scope (void);
308 static void pop_scope (void);
309 static tree
make_label (tree
, location_t
);
310 static void bind_label (tree
, tree
, struct c_scope
*);
311 static void implicit_decl_warning (tree
);
312 static tree
lookup_tag (enum tree_code
, tree
, int);
313 static tree
lookup_name_current_level (tree
);
314 static tree
grokdeclarator (tree
, tree
, enum decl_context
, int, tree
*);
315 static tree
grokparms (tree
, int);
316 static void layout_array_type (tree
);
317 static void store_parm_decls_newstyle (void);
318 static void store_parm_decls_oldstyle (void);
319 static tree
c_make_fname_decl (tree
, int);
320 static void c_expand_body_1 (tree
, int);
321 static tree
any_external_decl (tree
);
322 static void record_external_decl (tree
);
323 static void warn_if_shadowing (tree
, tree
);
324 static void check_bitfield_type_and_width (tree
*, tree
*, const char *);
325 static void clone_underlying_type (tree
);
326 static bool flexible_array_type_p (tree
);
327 static hashval_t
link_hash_hash (const void *);
328 static int link_hash_eq (const void *, const void *);
330 /* States indicating how grokdeclarator() should handle declspecs marked
331 with __attribute__((deprecated)). An object declared as
332 __attribute__((deprecated)) suppresses warnings of uses of other
335 enum deprecated_states
{
340 static enum deprecated_states deprecated_state
= DEPRECATED_NORMAL
;
343 c_print_identifier (FILE *file
, tree node
, int indent
)
345 print_node (file
, "symbol", IDENTIFIER_SYMBOL_VALUE (node
), indent
+ 4);
346 print_node (file
, "tag", IDENTIFIER_TAG_VALUE (node
), indent
+ 4);
347 print_node (file
, "label", IDENTIFIER_LABEL_VALUE (node
), indent
+ 4);
348 if (C_IS_RESERVED_WORD (node
))
350 tree rid
= ridpointers
[C_RID_CODE (node
)];
351 indent_to (file
, indent
+ 4);
352 fprintf (file
, "rid " HOST_PTR_PRINTF
" \"%s\"",
353 (void *) rid
, IDENTIFIER_POINTER (rid
));
357 /* Hook called at end of compilation to assume 1 elt
358 for a file-scope tentative array defn that wasn't complete before. */
361 c_finish_incomplete_decl (tree decl
)
363 if (TREE_CODE (decl
) == VAR_DECL
)
365 tree type
= TREE_TYPE (decl
);
366 if (type
!= error_mark_node
367 && TREE_CODE (type
) == ARRAY_TYPE
368 && ! DECL_EXTERNAL (decl
)
369 && TYPE_DOMAIN (type
) == 0)
371 warning ("%Jarray '%D' assumed to have one element", decl
, decl
);
373 complete_array_type (type
, NULL_TREE
, 1);
375 layout_decl (decl
, 0);
380 /* Reuse or create a struct for this scope. */
382 static struct c_scope
*
385 struct c_scope
*result
;
388 result
= scope_freelist
;
389 scope_freelist
= result
->outer
;
392 result
= ggc_alloc_cleared (sizeof (struct c_scope
));
397 /* Remove the topmost scope from the stack and add it to the
398 free list, updating current_function_scope if necessary. */
403 struct c_scope
*scope
= current_scope
;
405 current_scope
= scope
->outer
;
406 if (scope
->function_body
)
407 current_function_scope
= scope
->outer_function
;
409 memset (scope
, 0, sizeof (struct c_scope
));
410 scope
->outer
= scope_freelist
;
411 scope_freelist
= scope
;
414 /* The Objective-C front-end often needs to determine the current scope. */
417 get_current_scope (void)
419 return current_scope
;
422 /* The following function is used only by Objective-C. It needs to live here
423 because it accesses the innards of c_scope. */
426 objc_mark_locals_volatile (void *enclosing_blk
)
428 struct c_scope
*scope
;
430 for (scope
= current_scope
;
431 scope
&& scope
!= enclosing_blk
;
432 scope
= scope
->outer
)
436 for (decl
= scope
->names
; decl
; decl
= TREE_CHAIN (decl
))
438 DECL_REGISTER (decl
) = 0;
439 TREE_THIS_VOLATILE (decl
) = 1;
441 /* Do not climb up past the current function. */
442 if (scope
->function_body
)
447 /* Nonzero if we are currently in the global scope. */
450 global_bindings_p (void)
452 return current_scope
== global_scope
;
456 keep_next_level (void)
458 keep_next_level_flag
= true;
461 /* Identify this scope as currently being filled with parameters. */
464 declare_parm_level (void)
466 current_scope
->parm_flag
= true;
469 /* Nonzero if currently making parm declarations. */
472 in_parm_level_p (void)
474 return current_scope
->parm_flag
;
477 /* Enter a new scope. The dummy parameter is for signature
478 compatibility with lang_hooks.decls.pushlevel. */
481 pushlevel (int dummy ATTRIBUTE_UNUSED
)
483 if (next_is_function_body
)
485 /* This is the transition from the parameters to the top level
486 of the function body. These are the same scope
487 (C99 6.2.1p4,6) so we do not push another scope structure.
488 next_is_function_body is set only by store_parm_decls, which
489 in turn is called when and only when we are about to
490 encounter the opening curly brace for the function body.
492 The outermost block of a function always gets a BLOCK node,
493 because the debugging output routines expect that each
494 function has at least one BLOCK. */
495 current_scope
->parm_flag
= false;
496 current_scope
->function_body
= true;
497 current_scope
->keep
= true;
498 current_scope
->outer_function
= current_function_scope
;
499 current_function_scope
= current_scope
;
501 keep_next_level_flag
= false;
502 next_is_function_body
= false;
506 struct c_scope
*scope
= make_scope ();
508 scope
->keep
= keep_next_level_flag
;
509 scope
->outer
= current_scope
;
510 current_scope
= scope
;
511 keep_next_level_flag
= false;
515 /* Exit a scope. Restore the state of the identifier-decl mappings
516 that were in effect when this scope was entered.
518 If KEEP is KEEP_YES (1), this scope had explicit declarations, so
519 create a BLOCK node to record its declarations and subblocks for
520 debugging output. If KEEP is KEEP_MAYBE, do so only if the names
521 or tags lists are nonempty.
523 The second parameter is ignored; it is present only for
524 signature compatibility with lang_hooks.decls.poplevel.
526 If FUNCTIONBODY is nonzero, this level is the body of a function,
527 even if current_scope->function_body is not set. This is used
528 by language-independent code that generates synthetic functions,
529 and cannot set current_scope->function_body.
531 FIXME: Eliminate the need for all arguments. */
534 poplevel (int keep
, int dummy ATTRIBUTE_UNUSED
, int functionbody
)
536 struct c_scope
*scope
= current_scope
;
541 /* The following line does not use |= due to a bug in HP's C compiler. */
542 scope
->function_body
= scope
->function_body
| functionbody
;
544 if (keep
== KEEP_MAYBE
)
545 keep
= (scope
->names
|| scope
->tags
);
548 keep
|= scope
->function_body
;
550 /* If appropriate, create a BLOCK to record the decls for the life
555 block
= make_node (BLOCK
);
556 BLOCK_VARS (block
) = scope
->names
;
557 BLOCK_SUBBLOCKS (block
) = scope
->blocks
;
558 TREE_USED (block
) = 1;
561 /* In each subblock, record that this is its superior. */
562 for (p
= scope
->blocks
; p
; p
= TREE_CHAIN (p
))
563 BLOCK_SUPERCONTEXT (p
) = block
;
565 /* Clear out the variable bindings in this scope.
567 Propagate TREE_ADDRESSABLE from nested functions to their
568 containing functions.
570 Issue warnings for unused variables and labels, and errors for
571 undefined labels, if there are any. */
573 for (p
= scope
->names
; p
; p
= TREE_CHAIN (p
))
575 switch (TREE_CODE (p
))
578 if (TREE_USED (p
) && !DECL_INITIAL (p
))
580 error ("%Jlabel `%D' used but not defined", p
, p
);
581 DECL_INITIAL (p
) = error_mark_node
;
583 else if (!TREE_USED (p
) && warn_unused_label
)
585 if (DECL_INITIAL (p
))
586 warning ("%Jlabel `%D' defined but not used", p
, p
);
588 warning ("%Jlabel `%D' declared but not defined", p
, p
);
591 IDENTIFIER_LABEL_VALUE (DECL_NAME (p
)) = 0;
595 if (! TREE_ASM_WRITTEN (p
)
596 && DECL_INITIAL (p
) != 0
597 && TREE_ADDRESSABLE (p
)
598 && DECL_ABSTRACT_ORIGIN (p
) != 0
599 && DECL_ABSTRACT_ORIGIN (p
) != p
)
600 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (p
)) = 1;
604 /* Keep this in sync with stmt.c:warn_about_unused_variables.
605 No warnings when the global scope is popped because the
606 global scope isn't popped for the last translation unit,
607 so the warnings are done in c_write_global_declaration. */
608 if (warn_unused_variable
&& scope
!= global_scope
610 && !DECL_IN_SYSTEM_HEADER (p
)
612 && !DECL_ARTIFICIAL (p
))
613 warning ("%Junused variable `%D'", p
, p
);
620 if (DECL_EXTERNAL (p
) && scope
!= global_scope
)
621 /* External decls stay in the symbol-value slot but are
623 C_DECL_INVISIBLE (p
) = 1;
625 IDENTIFIER_SYMBOL_VALUE (DECL_NAME (p
)) = 0;
631 /* Clear out the parameter bindings in this scope, if any.
632 Unused-parameter warnings are handled by function.c. */
633 for (p
= scope
->parms
; p
; p
= TREE_CHAIN (p
))
635 IDENTIFIER_SYMBOL_VALUE (DECL_NAME (p
)) = 0;
637 /* Clear out the tag-meanings declared in this scope.
639 Set the TYPE_CONTEXTs for all of the tagged types belonging to
640 this scope so that they point to the appropriate construct, i.e.
641 either to the current FUNCTION_DECL node, or else to the BLOCK
642 node we just constructed.
644 Note that for tagged types whose scope is just the formal
645 parameter list for some function type specification, we can't
646 properly set their TYPE_CONTEXTs here, because we don't have a
647 pointer to the appropriate FUNCTION_TYPE node readily available
648 to us. For those cases, the TYPE_CONTEXTs of the relevant tagged
649 type nodes get set in `grokdeclarator' as soon as we have created
650 the FUNCTION_TYPE node which will represent the "scope" for these
651 "parameter list local" tagged types. */
653 decl
= scope
->function_body
? current_function_decl
: block
;
654 for (p
= scope
->tags
; p
; p
= TREE_CHAIN (p
))
656 if (TREE_PURPOSE (p
))
657 IDENTIFIER_TAG_VALUE (TREE_PURPOSE (p
)) = 0;
659 TYPE_CONTEXT (TREE_VALUE (p
)) = decl
;
662 /* Restore all name- and label-meanings from outer scopes that were
663 shadowed by this scope. */
664 for (p
= scope
->shadowed
; p
; p
= TREE_CHAIN (p
))
665 if (TREE_VALUE (p
) && TREE_CODE (TREE_VALUE (p
)) == LABEL_DECL
)
666 IDENTIFIER_LABEL_VALUE (TREE_PURPOSE (p
)) = TREE_VALUE (p
);
668 IDENTIFIER_SYMBOL_VALUE (TREE_PURPOSE (p
)) = TREE_VALUE (p
);
670 /* Restore all tag-meanings from outer scopes that were shadowed by
672 for (p
= scope
->shadowed_tags
; p
; p
= TREE_CHAIN (p
))
673 IDENTIFIER_TAG_VALUE (TREE_PURPOSE (p
)) = TREE_VALUE (p
);
675 /* Dispose of the block that we just made inside some higher level. */
676 if (scope
->function_body
&& current_function_decl
)
677 DECL_INITIAL (current_function_decl
) = block
;
678 else if (scope
->outer
)
681 SCOPE_LIST_APPEND (scope
->outer
, blocks
, block
);
682 /* If we did not make a block for the scope just exited, any
683 blocks made for inner scopes must be carried forward so they
684 will later become subblocks of something else. */
685 else if (scope
->blocks
)
686 SCOPE_LIST_CONCAT (scope
->outer
, blocks
, scope
, blocks
);
689 /* Pop the current scope, and free the structure for reuse. */
695 /* Insert BLOCK at the end of the list of subblocks of the current
696 scope. This is used when a BIND_EXPR is expanded, to handle the
697 BLOCK node inside the BIND_EXPR. */
700 insert_block (tree block
)
702 TREE_USED (block
) = 1;
703 SCOPE_LIST_APPEND (current_scope
, blocks
, block
);
706 /* Set the BLOCK node for the innermost scope (the one we are
707 currently in). The RTL expansion machinery requires us to provide
708 this hook, but it is not useful in function-at-a-time mode. */
711 set_block (tree block ATTRIBUTE_UNUSED
)
715 /* Push a definition or a declaration of struct, union or enum tag "name".
716 "type" should be the type node.
717 We assume that the tag "name" is not already defined.
719 Note that the definition may really be just a forward reference.
720 In that case, the TYPE_SIZE will be zero. */
723 pushtag (tree name
, tree type
)
725 struct c_scope
*b
= current_scope
;
727 /* Record the identifier as the type's name if it has none. */
730 if (TYPE_NAME (type
) == 0)
731 TYPE_NAME (type
) = name
;
733 if (IDENTIFIER_TAG_VALUE (name
))
734 b
->shadowed_tags
= tree_cons (name
, IDENTIFIER_TAG_VALUE (name
),
736 IDENTIFIER_TAG_VALUE (name
) = type
;
739 b
->tags
= tree_cons (name
, type
, b
->tags
);
741 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
742 tagged type we just added to the current scope. This fake
743 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
744 to output a representation of a tagged type, and it also gives
745 us a convenient place to record the "scope start" address for the
748 TYPE_STUB_DECL (type
) = pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, type
));
750 /* An approximation for now, so we can tell this is a function-scope tag.
751 This will be updated in poplevel. */
752 TYPE_CONTEXT (type
) = DECL_CONTEXT (TYPE_STUB_DECL (type
));
755 /* Subroutine of compare_decls. Allow harmless mismatches in return
756 and argument types provided that the type modes match. This function
757 return a unified type given a suitable match, and 0 otherwise. */
760 match_builtin_function_types (tree newtype
, tree oldtype
)
762 tree newrettype
, oldrettype
;
763 tree newargs
, oldargs
;
764 tree trytype
, tryargs
;
766 /* Accept the return type of the new declaration if same modes. */
767 oldrettype
= TREE_TYPE (oldtype
);
768 newrettype
= TREE_TYPE (newtype
);
770 if (TYPE_MODE (oldrettype
) != TYPE_MODE (newrettype
))
773 oldargs
= TYPE_ARG_TYPES (oldtype
);
774 newargs
= TYPE_ARG_TYPES (newtype
);
777 while (oldargs
|| newargs
)
781 || ! TREE_VALUE (oldargs
)
782 || ! TREE_VALUE (newargs
)
783 || TYPE_MODE (TREE_VALUE (oldargs
))
784 != TYPE_MODE (TREE_VALUE (newargs
)))
787 oldargs
= TREE_CHAIN (oldargs
);
788 newargs
= TREE_CHAIN (newargs
);
791 trytype
= build_function_type (newrettype
, tryargs
);
792 return build_type_attribute_variant (trytype
, TYPE_ATTRIBUTES (oldtype
));
795 /* Subroutine of diagnose_mismatched_decls. Check for function type
796 mismatch involving an empty arglist vs a nonempty one and give clearer
799 diagnose_arglist_conflict (tree newdecl
, tree olddecl
,
800 tree newtype
, tree oldtype
)
804 if (TREE_CODE (olddecl
) != FUNCTION_DECL
805 || !comptypes (TREE_TYPE (oldtype
), TREE_TYPE (newtype
), COMPARE_STRICT
)
806 || !((TYPE_ARG_TYPES (oldtype
) == 0 && DECL_INITIAL (olddecl
) == 0)
808 (TYPE_ARG_TYPES (newtype
) == 0 && DECL_INITIAL (newdecl
) == 0)))
811 t
= TYPE_ARG_TYPES (oldtype
);
813 t
= TYPE_ARG_TYPES (newtype
);
814 for (; t
; t
= TREE_CHAIN (t
))
816 tree type
= TREE_VALUE (t
);
818 if (TREE_CHAIN (t
) == 0
819 && TYPE_MAIN_VARIANT (type
) != void_type_node
)
821 inform ("a parameter list with an ellipsis can't match "
822 "an empty parameter name list declaration");
826 if (c_type_promotes_to (type
) != type
)
828 inform ("an argument type that has a default promotion can't match "
829 "an empty parameter name list declaration");
835 /* Another subroutine of diagnose_mismatched_decls. OLDDECL is an
836 old-style function definition, NEWDECL is a prototype declaration.
837 Diagnose inconsistencies in the argument list. Returns TRUE if
838 the prototype is compatible, FALSE if not. */
840 validate_proto_after_old_defn (tree newdecl
, tree newtype
, tree oldtype
)
842 tree newargs
, oldargs
;
845 /* ??? Elsewhere TYPE_MAIN_VARIANT is not used in this context. */
846 #define END_OF_ARGLIST(t) (TYPE_MAIN_VARIANT (t) == void_type_node)
848 oldargs
= TYPE_ACTUAL_ARG_TYPES (oldtype
);
849 newargs
= TYPE_ARG_TYPES (newtype
);
854 tree oldargtype
= TREE_VALUE (oldargs
);
855 tree newargtype
= TREE_VALUE (newargs
);
857 if (END_OF_ARGLIST (oldargtype
) && END_OF_ARGLIST (newargtype
))
860 /* Reaching the end of just one list means the two decls don't
861 agree on the number of arguments. */
862 if (END_OF_ARGLIST (oldargtype
))
864 error ("%Jprototype for '%D' declares more arguments "
865 "than previous old-style definition", newdecl
, newdecl
);
868 else if (END_OF_ARGLIST (newargtype
))
870 error ("%Jprototype for '%D' declares fewer arguments "
871 "than previous old-style definition", newdecl
, newdecl
);
875 /* Type for passing arg must be consistent with that declared
877 else if (! comptypes (oldargtype
, newargtype
, COMPARE_STRICT
))
879 error ("%Jprototype for '%D' declares arg %d with incompatible type",
880 newdecl
, newdecl
, i
);
884 oldargs
= TREE_CHAIN (oldargs
);
885 newargs
= TREE_CHAIN (newargs
);
889 /* If we get here, no errors were found, but do issue a warning
890 for this poor-style construct. */
891 warning ("%Jprototype for '%D' follows non-prototype definition",
894 #undef END_OF_ARGLIST
897 /* Subroutine of diagnose_mismatched_decls. Report the location of DECL,
898 first in a pair of mismatched declarations, using the diagnostic
901 locate_old_decl (tree decl
, void (*diag
)(const char *, ...))
903 if (TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_BUILT_IN (decl
))
905 else if (DECL_INITIAL (decl
))
906 diag (N_("%Jprevious definition of '%D' was here"), decl
, decl
);
907 else if (C_DECL_IMPLICIT (decl
))
908 diag (N_("%Jprevious implicit declaration of '%D' was here"), decl
, decl
);
910 diag (N_("%Jprevious declaration of '%D' was here"), decl
, decl
);
913 /* Subroutine of duplicate_decls. Compare NEWDECL to OLDDECL.
914 Returns true if the caller should proceed to merge the two, false
915 if OLDDECL should simply be discarded. As a side effect, issues
916 all necessary diagnostics for invalid or poor-style combinations.
917 If it returns true, writes the types of NEWDECL and OLDDECL to
918 *NEWTYPEP and *OLDTYPEP - these may have been adjusted from
919 TREE_TYPE (NEWDECL, OLDDECL) respectively. */
922 diagnose_mismatched_decls (tree newdecl
, tree olddecl
,
923 tree
*newtypep
, tree
*oldtypep
)
925 tree newtype
, oldtype
;
926 bool pedwarned
= false;
929 /* If we have error_mark_node for either decl or type, just discard
930 the previous decl - we're in an error cascade already. */
931 if (olddecl
== error_mark_node
|| newdecl
== error_mark_node
)
933 *oldtypep
= oldtype
= TREE_TYPE (olddecl
);
934 *newtypep
= newtype
= TREE_TYPE (newdecl
);
935 if (oldtype
== error_mark_node
|| newtype
== error_mark_node
)
938 /* Two different categories of symbol altogether. This is an error
939 unless OLDDECL is a builtin. OLDDECL will be discarded in any case. */
940 if (TREE_CODE (olddecl
) != TREE_CODE (newdecl
))
942 if (TREE_CODE (olddecl
) != FUNCTION_DECL
|| !DECL_BUILT_IN (olddecl
))
944 error ("%J'%D' redeclared as different kind of symbol",
946 locate_old_decl (olddecl
, error
);
948 else if (TREE_PUBLIC (newdecl
))
949 warning ("%Jbuilt-in function '%D' declared as non-function",
951 else if (warn_shadow
)
952 warning ("%Jshadowing built-in function '%D'",
957 if (!comptypes (oldtype
, newtype
, COMPARE_STRICT
))
959 if (TREE_CODE (olddecl
) == FUNCTION_DECL
&& DECL_BUILT_IN (olddecl
))
961 /* Accept harmless mismatch in function types.
962 This is for the ffs and fprintf builtins. */
963 tree trytype
= match_builtin_function_types (newtype
, oldtype
);
965 if (trytype
&& comptypes (newtype
, trytype
, COMPARE_STRICT
))
966 *oldtypep
= oldtype
= trytype
;
969 /* If types don't match for a built-in, throw away the
970 built-in. No point in calling locate_old_decl here, it
971 won't print anything. */
972 warning ("%Jconflicting types for built-in function '%D'",
977 else if (TREE_CODE (olddecl
) == FUNCTION_DECL
978 && DECL_SOURCE_LINE (olddecl
) == 0)
980 /* A conflicting function declaration for a predeclared
981 function that isn't actually built in. Objective C uses
982 these. The new declaration silently overrides everything
983 but the volatility (i.e. noreturn) indication. See also
984 below. FIXME: Make Objective C use normal builtins. */
985 TREE_THIS_VOLATILE (newdecl
) |= TREE_THIS_VOLATILE (olddecl
);
988 /* Permit void foo (...) to match int foo (...) if the latter is
989 the definition and implicit int was used. See
990 c-torture/compile/920625-2.c. */
991 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
&& DECL_INITIAL (newdecl
)
992 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype
)) == void_type_node
993 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype
)) == integer_type_node
994 && C_FUNCTION_IMPLICIT_INT (newdecl
))
996 pedwarn ("%Jconflicting types for '%D'", newdecl
, newdecl
);
997 /* Make sure we keep void as the return type. */
998 TREE_TYPE (newdecl
) = *newtypep
= newtype
= oldtype
;
999 C_FUNCTION_IMPLICIT_INT (newdecl
) = 0;
1004 error ("%Jconflicting types for '%D'", newdecl
, newdecl
);
1005 diagnose_arglist_conflict (newdecl
, olddecl
, newtype
, oldtype
);
1006 locate_old_decl (olddecl
, error
);
1011 /* Redeclaration of a type is a constraint violation (6.7.2.3p1),
1012 but silently ignore the redeclaration if either is in a system
1013 header. (Conflicting redeclarations were handled above.) */
1014 if (TREE_CODE (newdecl
) == TYPE_DECL
)
1016 if (DECL_IN_SYSTEM_HEADER (newdecl
) || DECL_IN_SYSTEM_HEADER (olddecl
))
1017 return true; /* allow OLDDECL to continue in use */
1019 error ("%Jredefinition of typedef '%D'", newdecl
, newdecl
);
1020 locate_old_decl (olddecl
, error
);
1024 /* Function declarations can either be 'static' or 'extern' (no
1025 qualifier is equivalent to 'extern' - C99 6.2.2p5) and therefore
1026 can never conflict with each other on account of linkage (6.2.2p4).
1027 Multiple definitions are not allowed (6.9p3,5) but GCC permits
1028 two definitions if one is 'extern inline' and one is not. The non-
1029 extern-inline definition supersedes the extern-inline definition. */
1030 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1032 /* If you declare a built-in function name as static, or
1033 define the built-in with an old-style definition (so we
1034 can't validate the argument list) the built-in definition is
1035 overridden, but optionally warn this was a bad choice of name. */
1036 if (DECL_BUILT_IN (olddecl
)
1037 && (!TREE_PUBLIC (newdecl
)
1038 || (DECL_INITIAL (newdecl
)
1039 && !TYPE_ARG_TYPES (TREE_TYPE (newdecl
)))))
1042 warning ("%Jshadowing built-in function '%D'", newdecl
, newdecl
);
1043 /* Discard the old built-in function. */
1047 if (DECL_INITIAL (newdecl
))
1049 if (DECL_INITIAL (olddecl
)
1050 && !(DECL_DECLARED_INLINE_P (olddecl
)
1051 && DECL_EXTERNAL (olddecl
)
1052 && !(DECL_DECLARED_INLINE_P (newdecl
)
1053 && DECL_EXTERNAL (newdecl
))))
1055 error ("%Jredefinition of '%D'", newdecl
, newdecl
);
1056 locate_old_decl (olddecl
, error
);
1060 /* If we have a prototype after an old-style function definition,
1061 the argument types must be checked specially. */
1062 else if (DECL_INITIAL (olddecl
)
1063 && !TYPE_ARG_TYPES (oldtype
) && TYPE_ARG_TYPES (newtype
)
1064 && TYPE_ACTUAL_ARG_TYPES (oldtype
)
1065 && !validate_proto_after_old_defn (newdecl
, newtype
, oldtype
))
1067 locate_old_decl (olddecl
, error
);
1070 /* Mismatched non-static and static is considered poor style.
1071 We only diagnose static then non-static if -Wtraditional,
1072 because it is the most convenient way to get some effects
1073 (see e.g. what unwind-dw2-fde-glibc.c does to the definition
1074 of _Unwind_Find_FDE in unwind-dw2-fde.c). Revisit? */
1075 if (TREE_PUBLIC (olddecl
) && !TREE_PUBLIC (newdecl
))
1077 /* A static function declaration for a predeclared function
1078 that isn't actually built in, silently overrides the
1079 default. Objective C uses these. See also above.
1080 FIXME: Make Objective C use normal builtins. */
1081 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1082 && DECL_SOURCE_LINE (olddecl
) == 0)
1086 warning ("%Jstatic declaration of '%D' follows "
1087 "non-static declaration", newdecl
, newdecl
);
1091 else if (TREE_PUBLIC (newdecl
) && !TREE_PUBLIC (olddecl
)
1092 && warn_traditional
)
1094 warning ("%Jnon-static declaration of '%D' follows "
1095 "static declaration", newdecl
, newdecl
);
1099 else if (TREE_CODE (newdecl
) == VAR_DECL
)
1101 /* Only variables can be thread-local, and all declarations must
1102 agree on this property. */
1103 if (DECL_THREAD_LOCAL (newdecl
) != DECL_THREAD_LOCAL (olddecl
))
1105 if (DECL_THREAD_LOCAL (newdecl
))
1106 error ("%Jthread-local declaration of '%D' follows "
1107 "non-thread-local declaration", newdecl
, newdecl
);
1109 error ("%Jnon-thread-local declaration of '%D' follows "
1110 "thread-local declaration", newdecl
, newdecl
);
1112 locate_old_decl (olddecl
, error
);
1116 /* Multiple initialized definitions are not allowed (6.9p3,5). */
1117 if (DECL_INITIAL (newdecl
) && DECL_INITIAL (olddecl
))
1119 error ("%Jredefinition of '%D'", newdecl
, newdecl
);
1120 locate_old_decl (olddecl
, error
);
1124 /* Objects declared at file scope: if at least one is 'extern',
1125 it's fine (6.2.2p4); otherwise the linkage must agree (6.2.2p7). */
1126 if (DECL_FILE_SCOPE_P (newdecl
))
1128 if (!DECL_EXTERNAL (newdecl
)
1129 && !DECL_EXTERNAL (olddecl
)
1130 && TREE_PUBLIC (newdecl
) != TREE_PUBLIC (olddecl
))
1132 if (TREE_PUBLIC (newdecl
))
1133 error ("%Jnon-static declaration of '%D' follows "
1134 "static declaration", newdecl
, newdecl
);
1136 error ("%Jstatic declaration of '%D' follows "
1137 "non-static declaration", newdecl
, newdecl
);
1139 locate_old_decl (olddecl
, error
);
1143 /* Two objects with the same name declared at the same block
1144 scope must both be external references (6.7p3). */
1145 else if (DECL_CONTEXT (newdecl
) == DECL_CONTEXT (olddecl
)
1146 && (!DECL_EXTERNAL (newdecl
) || !DECL_EXTERNAL (olddecl
)))
1148 if (DECL_EXTERNAL (newdecl
))
1149 error ("%Jextern declaration of '%D' follows "
1150 "declaration with no linkage", newdecl
, newdecl
);
1151 else if (DECL_EXTERNAL (olddecl
))
1152 error ("%Jdeclaration of '%D' with no linkage follows "
1153 "extern declaration", newdecl
, newdecl
);
1155 error ("%Jredeclaration of '%D' with no linkage",
1158 locate_old_decl (olddecl
, error
);
1164 /* All decls must agree on a non-default visibility. */
1165 if (DECL_VISIBILITY (newdecl
) != VISIBILITY_DEFAULT
1166 && DECL_VISIBILITY (olddecl
) != VISIBILITY_DEFAULT
1167 && DECL_VISIBILITY (newdecl
) != DECL_VISIBILITY (olddecl
))
1169 warning ("%Jredeclaration of '%D' with different visibility "
1170 "(old visibility preserved)", newdecl
, newdecl
);
1174 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1176 /* Diagnose inline __attribute__ ((noinline)) which is silly. */
1177 if (DECL_DECLARED_INLINE_P (newdecl
)
1178 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl
)))
1180 warning ("%Jinline declaration of '%D' follows "
1181 "declaration with attribute noinline", newdecl
, newdecl
);
1184 else if (DECL_DECLARED_INLINE_P (olddecl
)
1185 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl
)))
1187 warning ("%Jdeclaration of '%D' with attribute noinline follows "
1188 "inline declaration ", newdecl
, newdecl
);
1192 /* Inline declaration after use or definition.
1193 ??? Should we still warn about this now we have unit-at-a-time
1194 mode and can get it right? */
1195 if (DECL_DECLARED_INLINE_P (newdecl
) && !DECL_DECLARED_INLINE_P (olddecl
))
1197 if (TREE_USED (olddecl
))
1199 warning ("%J'%D' declared inline after being called",
1203 else if (DECL_INITIAL (olddecl
))
1205 warning ("%J'%D' declared inline after its definition",
1213 /* These bits are only type qualifiers when applied to objects. */
1214 if (TREE_THIS_VOLATILE (newdecl
) != TREE_THIS_VOLATILE (olddecl
))
1216 if (TREE_THIS_VOLATILE (newdecl
))
1217 pedwarn ("%Jvolatile declaration of '%D' follows "
1218 "non-volatile declaration", newdecl
, newdecl
);
1220 pedwarn ("%Jnon-volatile declaration of '%D' follows "
1221 "volatile declaration", newdecl
, newdecl
);
1224 if (TREE_READONLY (newdecl
) != TREE_READONLY (olddecl
))
1226 if (TREE_READONLY (newdecl
))
1227 pedwarn ("%Jconst declaration of '%D' follows "
1228 "non-const declaration", newdecl
, newdecl
);
1230 pedwarn ("%Jnon-const declaration of '%D' follows "
1231 "const declaration", newdecl
, newdecl
);
1236 /* Optional warning for completely redundant decls. */
1237 if (!warned
&& !pedwarned
1238 && warn_redundant_decls
1239 /* Don't warn about a function declaration followed by a
1241 && !(TREE_CODE (newdecl
) == FUNCTION_DECL
1242 && DECL_INITIAL (newdecl
) && !DECL_INITIAL (olddecl
))
1243 /* Don't warn about an extern followed by a definition. */
1244 && !(DECL_EXTERNAL (olddecl
) && !DECL_EXTERNAL (newdecl
)))
1246 warning ("%Jredundant redeclaration of '%D'", newdecl
, newdecl
);
1250 /* Report location of previous decl/defn in a consistent manner. */
1251 if (warned
|| pedwarned
)
1252 locate_old_decl (olddecl
, pedwarned
? pedwarn
: warning
);
1257 /* Subroutine of duplicate_decls. NEWDECL has been found to be
1258 consistent with OLDDECL, but carries new information. Merge the
1259 new information into OLDDECL. This function issues no
1263 merge_decls (tree newdecl
, tree olddecl
, tree newtype
, tree oldtype
)
1265 int new_is_definition
= (TREE_CODE (newdecl
) == FUNCTION_DECL
1266 && DECL_INITIAL (newdecl
) != 0);
1268 /* For real parm decl following a forward decl, return 1 so old decl
1269 will be reused. Only allow this to happen once. */
1270 if (TREE_CODE (newdecl
) == PARM_DECL
1271 && TREE_ASM_WRITTEN (olddecl
) && ! TREE_ASM_WRITTEN (newdecl
))
1273 TREE_ASM_WRITTEN (olddecl
) = 0;
1277 DECL_ATTRIBUTES (newdecl
)
1278 = (*targetm
.merge_decl_attributes
) (olddecl
, newdecl
);
1280 /* Merge the data types specified in the two decls. */
1282 = TREE_TYPE (olddecl
)
1283 = common_type (newtype
, oldtype
);
1285 /* Lay the type out, unless already done. */
1286 if (oldtype
!= TREE_TYPE (newdecl
))
1288 if (TREE_TYPE (newdecl
) != error_mark_node
)
1289 layout_type (TREE_TYPE (newdecl
));
1290 if (TREE_CODE (newdecl
) != FUNCTION_DECL
1291 && TREE_CODE (newdecl
) != TYPE_DECL
1292 && TREE_CODE (newdecl
) != CONST_DECL
)
1293 layout_decl (newdecl
, 0);
1297 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1298 DECL_SIZE (newdecl
) = DECL_SIZE (olddecl
);
1299 DECL_SIZE_UNIT (newdecl
) = DECL_SIZE_UNIT (olddecl
);
1300 DECL_MODE (newdecl
) = DECL_MODE (olddecl
);
1301 if (TREE_CODE (olddecl
) != FUNCTION_DECL
)
1302 if (DECL_ALIGN (olddecl
) > DECL_ALIGN (newdecl
))
1304 DECL_ALIGN (newdecl
) = DECL_ALIGN (olddecl
);
1305 DECL_USER_ALIGN (newdecl
) |= DECL_ALIGN (olddecl
);
1309 /* Keep the old rtl since we can safely use it. */
1310 COPY_DECL_RTL (olddecl
, newdecl
);
1312 /* Merge the type qualifiers. */
1313 if (TREE_READONLY (newdecl
))
1314 TREE_READONLY (olddecl
) = 1;
1316 if (TREE_THIS_VOLATILE (newdecl
))
1318 TREE_THIS_VOLATILE (olddecl
) = 1;
1319 if (TREE_CODE (newdecl
) == VAR_DECL
)
1320 make_var_volatile (newdecl
);
1323 /* Keep source location of definition rather than declaration. */
1324 if (DECL_INITIAL (newdecl
) == 0 && DECL_INITIAL (olddecl
) != 0)
1325 DECL_SOURCE_LOCATION (newdecl
) = DECL_SOURCE_LOCATION (olddecl
);
1327 /* Merge the unused-warning information. */
1328 if (DECL_IN_SYSTEM_HEADER (olddecl
))
1329 DECL_IN_SYSTEM_HEADER (newdecl
) = 1;
1330 else if (DECL_IN_SYSTEM_HEADER (newdecl
))
1331 DECL_IN_SYSTEM_HEADER (olddecl
) = 1;
1333 /* Merge the initialization information. */
1334 if (DECL_INITIAL (newdecl
) == 0)
1335 DECL_INITIAL (newdecl
) = DECL_INITIAL (olddecl
);
1337 /* Merge the section attribute.
1338 We want to issue an error if the sections conflict but that must be
1339 done later in decl_attributes since we are called before attributes
1341 if (DECL_SECTION_NAME (newdecl
) == NULL_TREE
)
1342 DECL_SECTION_NAME (newdecl
) = DECL_SECTION_NAME (olddecl
);
1344 /* Copy the assembler name.
1345 Currently, it can only be defined in the prototype. */
1346 COPY_DECL_ASSEMBLER_NAME (olddecl
, newdecl
);
1348 /* If either declaration has a nondefault visibility, use it. */
1349 if (DECL_VISIBILITY (olddecl
) != VISIBILITY_DEFAULT
)
1350 DECL_VISIBILITY (newdecl
) = DECL_VISIBILITY (olddecl
);
1352 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1354 DECL_STATIC_CONSTRUCTOR(newdecl
) |= DECL_STATIC_CONSTRUCTOR(olddecl
);
1355 DECL_STATIC_DESTRUCTOR (newdecl
) |= DECL_STATIC_DESTRUCTOR (olddecl
);
1356 DECL_NO_LIMIT_STACK (newdecl
) |= DECL_NO_LIMIT_STACK (olddecl
);
1357 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl
)
1358 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl
);
1359 TREE_THIS_VOLATILE (newdecl
) |= TREE_THIS_VOLATILE (olddecl
);
1360 TREE_READONLY (newdecl
) |= TREE_READONLY (olddecl
);
1361 DECL_IS_MALLOC (newdecl
) |= DECL_IS_MALLOC (olddecl
);
1362 DECL_IS_PURE (newdecl
) |= DECL_IS_PURE (olddecl
);
1365 /* Merge the storage class information. */
1366 merge_weak (newdecl
, olddecl
);
1368 /* For functions, static overrides non-static. */
1369 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1371 TREE_PUBLIC (newdecl
) &= TREE_PUBLIC (olddecl
);
1372 /* This is since we don't automatically
1373 copy the attributes of NEWDECL into OLDDECL. */
1374 TREE_PUBLIC (olddecl
) = TREE_PUBLIC (newdecl
);
1375 /* If this clears `static', clear it in the identifier too. */
1376 if (! TREE_PUBLIC (olddecl
))
1377 TREE_PUBLIC (DECL_NAME (olddecl
)) = 0;
1379 if (DECL_EXTERNAL (newdecl
))
1381 TREE_STATIC (newdecl
) = TREE_STATIC (olddecl
);
1382 DECL_EXTERNAL (newdecl
) = DECL_EXTERNAL (olddecl
);
1384 /* An extern decl does not override previous storage class. */
1385 TREE_PUBLIC (newdecl
) = TREE_PUBLIC (olddecl
);
1386 if (! DECL_EXTERNAL (newdecl
))
1388 DECL_CONTEXT (newdecl
) = DECL_CONTEXT (olddecl
);
1389 DECL_COMMON (newdecl
) = DECL_COMMON (olddecl
);
1394 TREE_STATIC (olddecl
) = TREE_STATIC (newdecl
);
1395 TREE_PUBLIC (olddecl
) = TREE_PUBLIC (newdecl
);
1398 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1400 /* If we're redefining a function previously defined as extern
1401 inline, make sure we emit debug info for the inline before we
1402 throw it away, in case it was inlined into a function that hasn't
1403 been written out yet. */
1404 if (new_is_definition
&& DECL_INITIAL (olddecl
))
1406 if (TREE_USED (olddecl
)
1407 /* In unit-at-a-time mode we never inline re-defined extern
1408 inline functions. */
1409 && !flag_unit_at_a_time
1410 && cgraph_function_possibly_inlined_p (olddecl
))
1411 (*debug_hooks
->outlining_inline_function
) (olddecl
);
1413 /* The new defn must not be inline. */
1414 DECL_INLINE (newdecl
) = 0;
1415 DECL_UNINLINABLE (newdecl
) = 1;
1419 /* If either decl says `inline', this fn is inline,
1420 unless its definition was passed already. */
1421 if (DECL_DECLARED_INLINE_P (newdecl
)
1422 || DECL_DECLARED_INLINE_P (olddecl
))
1423 DECL_DECLARED_INLINE_P (newdecl
) = 1;
1425 DECL_UNINLINABLE (newdecl
) = DECL_UNINLINABLE (olddecl
)
1426 = (DECL_UNINLINABLE (newdecl
) || DECL_UNINLINABLE (olddecl
));
1429 if (DECL_BUILT_IN (olddecl
))
1431 /* Get rid of any built-in function if we have a function
1433 if (new_is_definition
)
1435 TREE_TYPE (olddecl
) = TREE_TYPE (newdecl
);
1436 DECL_BUILT_IN_CLASS (olddecl
) = NOT_BUILT_IN
;
1440 /* If redeclaring a builtin function, and not a definition,
1441 it stays built in. */
1442 DECL_BUILT_IN_CLASS (newdecl
) = DECL_BUILT_IN_CLASS (olddecl
);
1443 DECL_FUNCTION_CODE (newdecl
) = DECL_FUNCTION_CODE (olddecl
);
1447 /* Also preserve various other info from the definition. */
1448 if (! new_is_definition
)
1450 DECL_RESULT (newdecl
) = DECL_RESULT (olddecl
);
1451 DECL_INITIAL (newdecl
) = DECL_INITIAL (olddecl
);
1452 DECL_SAVED_INSNS (newdecl
) = DECL_SAVED_INSNS (olddecl
);
1453 DECL_SAVED_TREE (newdecl
) = DECL_SAVED_TREE (olddecl
);
1454 DECL_ESTIMATED_INSNS (newdecl
) = DECL_ESTIMATED_INSNS (olddecl
);
1455 DECL_ARGUMENTS (newdecl
) = DECL_ARGUMENTS (olddecl
);
1457 /* Set DECL_INLINE on the declaration if we've got a body
1458 from which to instantiate. */
1459 if (DECL_INLINE (olddecl
) && ! DECL_UNINLINABLE (newdecl
))
1461 DECL_INLINE (newdecl
) = 1;
1462 DECL_ABSTRACT_ORIGIN (newdecl
)
1463 = DECL_ABSTRACT_ORIGIN (olddecl
);
1468 /* If a previous declaration said inline, mark the
1469 definition as inlinable. */
1470 if (DECL_DECLARED_INLINE_P (newdecl
)
1471 && ! DECL_UNINLINABLE (newdecl
))
1472 DECL_INLINE (newdecl
) = 1;
1476 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
1477 But preserve OLDDECL's DECL_UID. */
1479 unsigned olddecl_uid
= DECL_UID (olddecl
);
1481 memcpy ((char *) olddecl
+ sizeof (struct tree_common
),
1482 (char *) newdecl
+ sizeof (struct tree_common
),
1483 sizeof (struct tree_decl
) - sizeof (struct tree_common
));
1484 DECL_UID (olddecl
) = olddecl_uid
;
1487 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
1488 so that encode_section_info has a chance to look at the new decl
1489 flags and attributes. */
1490 if (DECL_RTL_SET_P (olddecl
)
1491 && (TREE_CODE (olddecl
) == FUNCTION_DECL
1492 || (TREE_CODE (olddecl
) == VAR_DECL
1493 && TREE_STATIC (olddecl
))))
1494 make_decl_rtl (olddecl
, NULL
);
1497 /* Handle when a new declaration NEWDECL has the same name as an old
1498 one OLDDECL in the same binding contour. Prints an error message
1501 If safely possible, alter OLDDECL to look like NEWDECL, and return
1502 true. Otherwise, return false. */
1505 duplicate_decls (tree newdecl
, tree olddecl
)
1507 tree newtype
, oldtype
;
1509 if (!diagnose_mismatched_decls (newdecl
, olddecl
, &newtype
, &oldtype
))
1512 merge_decls (newdecl
, olddecl
, newtype
, oldtype
);
1517 /* Return any external DECL associated with ID, whether or not it is
1518 currently in scope. */
1521 any_external_decl (tree id
)
1523 tree decl
= IDENTIFIER_SYMBOL_VALUE (id
);
1526 if (decl
== 0 || TREE_CODE (decl
) == ERROR_MARK
)
1528 else if (TREE_CODE (decl
) != TYPE_DECL
&& DECL_EXTERNAL (decl
))
1531 t
= purpose_member (id
, truly_local_externals
);
1533 return TREE_VALUE (t
);
1538 /* Record an external decl DECL. This only does something if a
1539 shadowing decl already exists. */
1541 record_external_decl (tree decl
)
1543 tree name
= DECL_NAME (decl
);
1544 if (!IDENTIFIER_SYMBOL_VALUE (name
))
1547 truly_local_externals
= tree_cons (name
, decl
, truly_local_externals
);
1550 /* Check whether decl-node X shadows an existing declaration.
1551 OLD is the old IDENTIFIER_SYMBOL_VALUE of the DECL_NAME of X,
1552 which might be a NULL_TREE. */
1554 warn_if_shadowing (tree x
, tree old
)
1558 /* Nothing to shadow? */
1560 /* Shadow warnings not wanted? */
1562 /* No shadow warnings for internally generated vars. */
1563 || DECL_SOURCE_LINE (x
) == 0
1564 /* No shadow warnings for vars made for inlining. */
1565 || DECL_FROM_INLINE (x
)
1566 /* Don't warn about the parm names in function declarator
1567 within a function declarator.
1568 It would be nice to avoid warning in any function
1569 declarator in a declaration, as opposed to a definition,
1570 but there is no way to tell it's not a definition. */
1571 || (TREE_CODE (x
) == PARM_DECL
&& current_scope
->outer
->parm_flag
))
1574 name
= IDENTIFIER_POINTER (DECL_NAME (x
));
1575 if (TREE_CODE (old
) == PARM_DECL
)
1576 shadow_warning (SW_PARAM
, name
, old
);
1577 else if (DECL_FILE_SCOPE_P (old
))
1578 shadow_warning (SW_GLOBAL
, name
, old
);
1580 shadow_warning (SW_LOCAL
, name
, old
);
1584 /* Subroutine of pushdecl.
1586 X is a TYPE_DECL for a typedef statement. Create a brand new
1587 ..._TYPE node (which will be just a variant of the existing
1588 ..._TYPE node with identical properties) and then install X
1589 as the TYPE_NAME of this brand new (duplicate) ..._TYPE node.
1591 The whole point here is to end up with a situation where each
1592 and every ..._TYPE node the compiler creates will be uniquely
1593 associated with AT MOST one node representing a typedef name.
1594 This way, even though the compiler substitutes corresponding
1595 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
1596 early on, later parts of the compiler can always do the reverse
1597 translation and get back the corresponding typedef name. For
1600 typedef struct S MY_TYPE;
1603 Later parts of the compiler might only know that `object' was of
1604 type `struct S' if it were not for code just below. With this
1605 code however, later parts of the compiler see something like:
1607 struct S' == struct S
1608 typedef struct S' MY_TYPE;
1611 And they can then deduce (from the node for type struct S') that
1612 the original object declaration was:
1616 Being able to do this is important for proper support of protoize,
1617 and also for generating precise symbolic debugging information
1618 which takes full account of the programmer's (typedef) vocabulary.
1620 Obviously, we don't want to generate a duplicate ..._TYPE node if
1621 the TYPE_DECL node that we are now processing really represents a
1622 standard built-in type.
1624 Since all standard types are effectively declared at line zero
1625 in the source file, we can easily check to see if we are working
1626 on a standard type by checking the current value of lineno. */
1629 clone_underlying_type (tree x
)
1631 if (DECL_SOURCE_LINE (x
) == 0)
1633 if (TYPE_NAME (TREE_TYPE (x
)) == 0)
1634 TYPE_NAME (TREE_TYPE (x
)) = x
;
1636 else if (TREE_TYPE (x
) != error_mark_node
1637 && DECL_ORIGINAL_TYPE (x
) == NULL_TREE
)
1639 tree tt
= TREE_TYPE (x
);
1640 DECL_ORIGINAL_TYPE (x
) = tt
;
1641 tt
= build_type_copy (tt
);
1643 TREE_USED (tt
) = TREE_USED (x
);
1648 /* Record a decl-node X as belonging to the current lexical scope.
1649 Check for errors (such as an incompatible declaration for the same
1650 name already seen in the same scope).
1652 Returns either X or an old decl for the same name.
1653 If an old decl is returned, it may have been smashed
1654 to agree with what X says. */
1659 tree name
= DECL_NAME (x
);
1660 struct c_scope
*scope
= current_scope
;
1662 #ifdef ENABLE_CHECKING
1663 if (error_mark_node
== 0)
1664 /* Called too early. */
1668 /* Functions need the lang_decl data. */
1669 if (TREE_CODE (x
) == FUNCTION_DECL
&& ! DECL_LANG_SPECIFIC (x
))
1670 DECL_LANG_SPECIFIC (x
) = ggc_alloc_cleared (sizeof (struct lang_decl
));
1672 /* A local extern declaration for a function doesn't constitute nesting.
1673 A local auto declaration does, since it's a forward decl
1674 for a nested function coming later. */
1675 if (current_function_decl
== NULL
1676 || ((TREE_CODE (x
) == FUNCTION_DECL
|| TREE_CODE (x
) == VAR_DECL
)
1677 && DECL_INITIAL (x
) == 0 && DECL_EXTERNAL (x
)))
1678 DECL_CONTEXT (x
) = current_file_decl
;
1680 DECL_CONTEXT (x
) = current_function_decl
;
1686 if (warn_nested_externs
1687 && scope
!= global_scope
1688 && DECL_EXTERNAL (x
)
1689 && !DECL_IN_SYSTEM_HEADER (x
))
1690 warning ("nested extern declaration of `%s'",
1691 IDENTIFIER_POINTER (name
));
1693 old
= lookup_name_current_level (name
);
1694 if (old
&& duplicate_decls (x
, old
))
1696 /* For PARM_DECLs, old may be a forward declaration.
1697 If so, we want to remove it from its old location
1698 (in the variables chain) and rechain it in the
1699 location given by the new declaration. */
1700 if (TREE_CODE (x
) == PARM_DECL
)
1703 for (p
= &scope
->names
; *p
; p
= &TREE_CHAIN (*p
))
1706 *p
= TREE_CHAIN (old
);
1707 SCOPE_LIST_APPEND (scope
, parms
, old
);
1713 if (DECL_EXTERNAL (x
) || scope
== global_scope
)
1715 /* Find and check against a previous, not-in-scope, external
1716 decl for this identifier. (C99 6.2.7p2: All declarations
1717 that refer to the same object or function shall have
1718 compatible type; otherwise, the behavior is undefined.) */
1719 tree ext
= any_external_decl (name
);
1722 if (duplicate_decls (x
, ext
))
1723 x
= copy_node (ext
);
1726 record_external_decl (x
);
1729 if (TREE_CODE (x
) == TYPE_DECL
)
1730 clone_underlying_type (x
);
1732 /* If storing a local value, there may already be one
1733 (inherited). If so, record it for restoration when this
1734 scope ends. Take care not to do this if we are replacing an
1735 older decl in the same scope (i.e. duplicate_decls returned
1737 if (scope
!= global_scope
1738 && IDENTIFIER_SYMBOL_VALUE (name
)
1739 && IDENTIFIER_SYMBOL_VALUE (name
) != old
)
1741 warn_if_shadowing (x
, IDENTIFIER_SYMBOL_VALUE (name
));
1742 scope
->shadowed
= tree_cons (name
, IDENTIFIER_SYMBOL_VALUE (name
),
1746 /* Install the new declaration in the requested scope. */
1747 IDENTIFIER_SYMBOL_VALUE (name
) = x
;
1748 C_DECL_INVISIBLE (x
) = 0;
1750 /* If x's type is incomplete because it's based on a
1751 structure or union which has not yet been fully declared,
1752 attach it to that structure or union type, so we can go
1753 back and complete the variable declaration later, if the
1754 structure or union gets fully declared.
1756 If the input is erroneous, we can have error_mark in the type
1757 slot (e.g. "f(void a, ...)") - that doesn't count as an
1759 if (TREE_TYPE (x
) != error_mark_node
1760 && !COMPLETE_TYPE_P (TREE_TYPE (x
)))
1762 tree element
= TREE_TYPE (x
);
1764 while (TREE_CODE (element
) == ARRAY_TYPE
)
1765 element
= TREE_TYPE (element
);
1766 element
= TYPE_MAIN_VARIANT (element
);
1768 if ((TREE_CODE (element
) == RECORD_TYPE
1769 || TREE_CODE (element
) == UNION_TYPE
)
1770 && (TREE_CODE (x
) != TYPE_DECL
1771 || TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
)
1772 && !COMPLETE_TYPE_P (element
))
1773 C_TYPE_INCOMPLETE_VARS (element
)
1774 = tree_cons (NULL_TREE
, x
, C_TYPE_INCOMPLETE_VARS (element
));
1778 if (TREE_CODE (x
) == PARM_DECL
)
1779 SCOPE_LIST_APPEND (scope
, parms
, x
);
1781 SCOPE_LIST_APPEND (scope
, names
, x
);
1786 /* Record X as belonging to the global scope (C99 "file scope").
1787 This is used only internally by the Objective-C front end,
1788 and is limited to its needs. duplicate_decls is not called;
1789 if there is any preexisting decl for this identifier, it is an ICE. */
1792 pushdecl_top_level (tree x
)
1796 if (TREE_CODE (x
) != VAR_DECL
)
1799 name
= DECL_NAME (x
);
1801 if (IDENTIFIER_SYMBOL_VALUE (name
))
1804 DECL_CONTEXT (x
) = current_file_decl
;
1805 IDENTIFIER_SYMBOL_VALUE (name
) = x
;
1807 SCOPE_LIST_APPEND (global_scope
, names
, x
);
1811 /* Generate an implicit declaration for identifier FUNCTIONID as a
1812 function of type int (). */
1815 implicitly_declare (tree functionid
)
1817 tree decl
= any_external_decl (functionid
);
1821 /* Implicit declaration of a function already declared
1822 (somehow) in a different scope, or as a built-in.
1823 If this is the first time this has happened, warn;
1824 then recycle the old declaration. */
1825 if (!C_DECL_IMPLICIT (decl
))
1827 implicit_decl_warning (DECL_NAME (decl
));
1828 if (! DECL_FILE_SCOPE_P (decl
))
1829 warning ("%Jprevious declaration of '%D'", decl
, decl
);
1830 C_DECL_IMPLICIT (decl
) = 1;
1832 /* If this function is global, then it must already be in the
1833 global scope, so there's no need to push it again. */
1834 if (current_scope
== global_scope
)
1836 /* If this is a local declaration, make a copy; we can't have
1837 the same DECL listed in two different scopes. */
1838 return pushdecl (copy_node (decl
));
1841 /* Not seen before. */
1842 decl
= build_decl (FUNCTION_DECL
, functionid
, default_function_type
);
1843 DECL_EXTERNAL (decl
) = 1;
1844 TREE_PUBLIC (decl
) = 1;
1845 C_DECL_IMPLICIT (decl
) = 1;
1846 implicit_decl_warning (functionid
);
1848 /* C89 says implicit declarations are in the innermost block.
1849 So we record the decl in the standard fashion. */
1850 decl
= pushdecl (decl
);
1852 /* No need to call objc_check_decl here - it's a function type. */
1853 rest_of_decl_compilation (decl
, NULL
, 0, 0);
1855 /* Write a record describing this implicit function declaration
1856 to the prototypes file (if requested). */
1857 gen_aux_info_record (decl
, 0, 1, 0);
1859 /* Possibly apply some default attributes to this implicit declaration. */
1860 decl_attributes (&decl
, NULL_TREE
, 0);
1866 implicit_decl_warning (tree id
)
1868 const char *name
= IDENTIFIER_POINTER (id
);
1869 if (mesg_implicit_function_declaration
== 2)
1870 error ("implicit declaration of function `%s'", name
);
1871 else if (mesg_implicit_function_declaration
== 1)
1872 warning ("implicit declaration of function `%s'", name
);
1875 /* Issue an error message for a reference to an undeclared variable
1876 ID, including a reference to a builtin outside of function-call
1877 context. Establish a binding of the identifier to error_mark_node
1878 in an appropriate scope, which will suppress further errors for the
1881 undeclared_variable (tree id
)
1883 static bool already
= false;
1884 struct c_scope
*scope
;
1886 if (current_function_decl
== 0)
1888 error ("`%s' undeclared here (not in a function)",
1889 IDENTIFIER_POINTER (id
));
1890 scope
= current_scope
;
1894 error ("`%s' undeclared (first use in this function)",
1895 IDENTIFIER_POINTER (id
));
1899 error ("(Each undeclared identifier is reported only once");
1900 error ("for each function it appears in.)");
1904 scope
= current_function_scope
;
1907 scope
->shadowed
= tree_cons (id
, IDENTIFIER_SYMBOL_VALUE (id
),
1909 IDENTIFIER_SYMBOL_VALUE (id
) = error_mark_node
;
1912 /* Subroutine of lookup_label, declare_label, define_label: construct a
1913 LABEL_DECL with all the proper frills. */
1916 make_label (tree name
, location_t location
)
1918 tree label
= build_decl (LABEL_DECL
, name
, void_type_node
);
1920 DECL_CONTEXT (label
) = current_function_decl
;
1921 DECL_MODE (label
) = VOIDmode
;
1922 DECL_SOURCE_LOCATION (label
) = location
;
1927 /* Another subroutine of lookup_label, declare_label, define_label:
1928 set up the binding of name to LABEL_DECL in the given SCOPE. */
1931 bind_label (tree name
, tree label
, struct c_scope
*scope
)
1933 if (IDENTIFIER_LABEL_VALUE (name
))
1934 scope
->shadowed
= tree_cons (name
, IDENTIFIER_LABEL_VALUE (name
),
1936 IDENTIFIER_LABEL_VALUE (name
) = label
;
1938 SCOPE_LIST_APPEND (scope
, names
, label
);
1941 /* Get the LABEL_DECL corresponding to identifier NAME as a label.
1942 Create one if none exists so far for the current function.
1943 This is called when a label is used in a goto expression or
1944 has its address taken. */
1947 lookup_label (tree name
)
1951 if (current_function_decl
== 0)
1953 error ("label %s referenced outside of any function",
1954 IDENTIFIER_POINTER (name
));
1958 /* Use a label already defined or ref'd with this name, but not if
1959 it is inherited from a containing function and wasn't declared
1961 label
= IDENTIFIER_LABEL_VALUE (name
);
1962 if (label
&& (DECL_CONTEXT (label
) == current_function_decl
1963 || C_DECLARED_LABEL_FLAG (label
)))
1965 /* If the label has only been declared, update its apparent
1966 location to point here, for better diagnostics if it
1967 turns out not to have been defined. */
1968 if (!TREE_USED (label
))
1969 DECL_SOURCE_LOCATION (label
) = input_location
;
1973 /* No label binding for that identifier; make one. */
1974 label
= make_label (name
, input_location
);
1976 /* Ordinary labels go in the current function scope. */
1977 bind_label (name
, label
, current_function_scope
);
1981 /* Make a label named NAME in the current function, shadowing silently
1982 any that may be inherited from containing functions or containing
1983 scopes. This is called for __label__ declarations. */
1985 /* Note that valid use, if the label being shadowed comes from another
1986 scope in the same function, requires calling declare_nonlocal_label
1987 right away. (Is this still true? -zw 2003-07-17) */
1990 declare_label (tree name
)
1992 tree label
= IDENTIFIER_LABEL_VALUE (name
);
1995 /* Check to make sure that the label hasn't already been declared
1997 for (dup
= current_scope
->names
; dup
; dup
= TREE_CHAIN (dup
))
2000 error ("duplicate label declaration `%s'", IDENTIFIER_POINTER (name
));
2001 error ("%Jthis is a previous declaration", dup
);
2003 /* Just use the previous declaration. */
2007 label
= make_label (name
, input_location
);
2008 C_DECLARED_LABEL_FLAG (label
) = 1;
2010 /* Declared labels go in the current scope. */
2011 bind_label (name
, label
, current_scope
);
2015 /* Define a label, specifying the location in the source file.
2016 Return the LABEL_DECL node for the label, if the definition is valid.
2017 Otherwise return 0. */
2020 define_label (location_t location
, tree name
)
2024 /* Find any preexisting label with this name. It is an error
2025 if that label has already been defined in this function, or
2026 if there is a containing function with a declared label with
2028 label
= IDENTIFIER_LABEL_VALUE (name
);
2031 && ((DECL_CONTEXT (label
) == current_function_decl
2032 && DECL_INITIAL (label
) != 0)
2033 || (DECL_CONTEXT (label
) != current_function_decl
2034 && C_DECLARED_LABEL_FLAG (label
))))
2036 error ("%Hduplicate label `%D'", &location
, label
);
2037 if (DECL_INITIAL (label
))
2038 error ("%J`%D' previously defined here", label
, label
);
2040 error ("%J`%D' previously declared here", label
, label
);
2043 else if (label
&& DECL_CONTEXT (label
) == current_function_decl
)
2045 /* The label has been used or declared already in this function,
2046 but not defined. Update its location to point to this
2048 DECL_SOURCE_LOCATION (label
) = location
;
2052 /* No label binding for that identifier; make one. */
2053 label
= make_label (name
, location
);
2055 /* Ordinary labels go in the current function scope. */
2056 bind_label (name
, label
, current_function_scope
);
2059 if (warn_traditional
&& !in_system_header
&& lookup_name (name
))
2060 warning ("%Htraditional C lacks a separate namespace for labels, "
2061 "identifier `%s' conflicts", &location
,
2062 IDENTIFIER_POINTER (name
));
2064 /* Mark label as having been defined. */
2065 DECL_INITIAL (label
) = error_mark_node
;
2069 /* Return the list of declarations of the current scope. */
2074 return current_scope
->names
;
2078 /* Given NAME, an IDENTIFIER_NODE,
2079 return the structure (or union or enum) definition for that name.
2080 If THISLEVEL_ONLY is nonzero, searches only the current_scope.
2081 CODE says which kind of type the caller wants;
2082 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2083 If the wrong kind of type is found, an error is reported. */
2086 lookup_tag (enum tree_code code
, tree name
, int thislevel_only
)
2088 tree tag
= IDENTIFIER_TAG_VALUE (name
);
2094 /* We only care about whether it's in this level if
2095 thislevel_only was set or it might be a type clash. */
2096 if (thislevel_only
|| TREE_CODE (tag
) != code
)
2098 if (current_scope
== global_scope
2099 || purpose_member (name
, current_scope
->tags
))
2103 if (thislevel_only
&& !thislevel
)
2106 if (TREE_CODE (tag
) != code
)
2108 /* Definition isn't the kind we were looking for. */
2109 pending_invalid_xref
= name
;
2110 pending_invalid_xref_location
= input_location
;
2112 /* If in the same binding level as a declaration as a tag
2113 of a different type, this must not be allowed to
2114 shadow that tag, so give the error immediately.
2115 (For example, "struct foo; union foo;" is invalid.) */
2117 pending_xref_error ();
2122 /* Print an error message now
2123 for a recent invalid struct, union or enum cross reference.
2124 We don't print them immediately because they are not invalid
2125 when used in the `struct foo;' construct for shadowing. */
2128 pending_xref_error (void)
2130 if (pending_invalid_xref
!= 0)
2131 error ("%H`%s' defined as wrong kind of tag",
2132 &pending_invalid_xref_location
,
2133 IDENTIFIER_POINTER (pending_invalid_xref
));
2134 pending_invalid_xref
= 0;
2138 /* Look up NAME in the current scope and its superiors
2139 in the namespace of variables, functions and typedefs.
2140 Return a ..._DECL node of some kind representing its definition,
2141 or return 0 if it is undefined. */
2144 lookup_name (tree name
)
2146 tree decl
= IDENTIFIER_SYMBOL_VALUE (name
);
2147 if (decl
== 0 || decl
== error_mark_node
)
2149 if (C_DECL_INVISIBLE (decl
))
2154 /* Similar to `lookup_name' but look only at the current scope. */
2157 lookup_name_current_level (tree name
)
2159 tree decl
= IDENTIFIER_SYMBOL_VALUE (name
);
2161 if (decl
== 0 || decl
== error_mark_node
|| C_DECL_INVISIBLE (decl
))
2164 if (current_scope
== global_scope
)
2167 /* Scan the current scope for a decl with name NAME.
2168 For PARM_DECLs, we have to look at both ->parms and ->names, since
2169 forward parameter declarations wind up on the ->names list. */
2170 if (TREE_CODE (decl
) == PARM_DECL
2171 && chain_member (decl
, current_scope
->parms
))
2173 if (chain_member (decl
, current_scope
->names
))
2179 /* Create the predefined scalar types of C,
2180 and some nodes representing standard constants (0, 1, (void *) 0).
2181 Initialize the global scope.
2182 Make definitions for built-in primitive functions. */
2185 c_init_decl_processing (void)
2188 tree ptr_ftype_void
, ptr_ftype_ptr
;
2189 location_t save_loc
= input_location
;
2191 /* Adds some ggc roots, and reserved words for c-parse.in. */
2194 current_function_decl
= 0;
2196 /* Make the c_scope structure for global names. */
2198 global_scope
= current_scope
;
2200 /* Declarations from c_common_nodes_and_builtins must not be associated
2201 with this input file, lest we get differences between using and not
2202 using preprocessed headers. */
2203 input_location
.file
= "<internal>";
2204 input_location
.line
= 0;
2206 /* Make the DECL for the toplevel file scope. */
2207 current_file_decl
= build_decl (TRANSLATION_UNIT_DECL
, NULL
, NULL
);
2209 build_common_tree_nodes (flag_signed_char
);
2211 c_common_nodes_and_builtins ();
2213 /* In C, comparisons and TRUTH_* expressions have type int. */
2214 truthvalue_type_node
= integer_type_node
;
2215 truthvalue_true_node
= integer_one_node
;
2216 truthvalue_false_node
= integer_zero_node
;
2218 /* Even in C99, which has a real boolean type. */
2219 pushdecl (build_decl (TYPE_DECL
, get_identifier ("_Bool"),
2220 boolean_type_node
));
2222 endlink
= void_list_node
;
2223 ptr_ftype_void
= build_function_type (ptr_type_node
, endlink
);
2225 = build_function_type (ptr_type_node
,
2226 tree_cons (NULL_TREE
, ptr_type_node
, endlink
));
2228 input_location
= save_loc
;
2230 pedantic_lvalues
= true;
2232 make_fname_decl
= c_make_fname_decl
;
2233 start_fname_decls ();
2235 first_builtin_decl
= global_scope
->names
;
2236 last_builtin_decl
= global_scope
->names_last
;
2239 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
2240 decl, NAME is the initialization string and TYPE_DEP indicates whether
2241 NAME depended on the type of the function. As we don't yet implement
2242 delayed emission of static data, we mark the decl as emitted
2243 so it is not placed in the output. Anything using it must therefore pull
2244 out the STRING_CST initializer directly. FIXME. */
2247 c_make_fname_decl (tree id
, int type_dep
)
2249 const char *name
= fname_as_string (type_dep
);
2250 tree decl
, type
, init
;
2251 size_t length
= strlen (name
);
2253 type
= build_array_type
2254 (build_qualified_type (char_type_node
, TYPE_QUAL_CONST
),
2255 build_index_type (size_int (length
)));
2257 decl
= build_decl (VAR_DECL
, id
, type
);
2259 TREE_STATIC (decl
) = 1;
2260 TREE_READONLY (decl
) = 1;
2261 DECL_ARTIFICIAL (decl
) = 1;
2263 init
= build_string (length
+ 1, name
);
2264 TREE_TYPE (init
) = type
;
2265 DECL_INITIAL (decl
) = init
;
2267 TREE_USED (decl
) = 1;
2269 if (current_function_decl
)
2271 DECL_CONTEXT (decl
) = current_function_decl
;
2272 IDENTIFIER_SYMBOL_VALUE (id
) = decl
;
2273 SCOPE_LIST_APPEND (current_function_scope
, names
, decl
);
2276 finish_decl (decl
, init
, NULL_TREE
);
2281 /* Return a definition for a builtin function named NAME and whose data type
2282 is TYPE. TYPE should be a function type with argument types.
2283 FUNCTION_CODE tells later passes how to compile calls to this function.
2284 See tree.h for its possible values.
2286 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
2287 the name to be called if we can't opencode the function. If
2288 ATTRS is nonzero, use that for the function's attribute list. */
2291 builtin_function (const char *name
, tree type
, int function_code
,
2292 enum built_in_class
class, const char *library_name
,
2295 tree decl
= build_decl (FUNCTION_DECL
, get_identifier (name
), type
);
2296 DECL_EXTERNAL (decl
) = 1;
2297 TREE_PUBLIC (decl
) = 1;
2299 SET_DECL_ASSEMBLER_NAME (decl
, get_identifier (library_name
));
2300 make_decl_rtl (decl
, NULL
);
2302 DECL_BUILT_IN_CLASS (decl
) = class;
2303 DECL_FUNCTION_CODE (decl
) = function_code
;
2305 /* Warn if a function in the namespace for users
2306 is used without an occasion to consider it declared. */
2307 if (name
[0] != '_' || name
[1] != '_')
2308 C_DECL_INVISIBLE (decl
) = 1;
2310 /* Possibly apply some default attributes to this built-in function. */
2312 decl_attributes (&decl
, attrs
, ATTR_FLAG_BUILT_IN
);
2314 decl_attributes (&decl
, NULL_TREE
, 0);
2319 /* Called when a declaration is seen that contains no names to declare.
2320 If its type is a reference to a structure, union or enum inherited
2321 from a containing scope, shadow that tag name for the current scope
2322 with a forward reference.
2323 If its type defines a new named structure or union
2324 or defines an enum, it is valid but we need not do anything here.
2325 Otherwise, it is an error. */
2328 shadow_tag (tree declspecs
)
2330 shadow_tag_warned (declspecs
, 0);
2334 shadow_tag_warned (tree declspecs
, int warned
)
2337 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
2344 pending_invalid_xref
= 0;
2346 /* Remove the attributes from declspecs, since they will confuse the
2348 split_specs_attrs (declspecs
, &specs
, &attrs
);
2350 for (link
= specs
; link
; link
= TREE_CHAIN (link
))
2352 tree value
= TREE_VALUE (link
);
2353 enum tree_code code
= TREE_CODE (value
);
2355 if (code
== RECORD_TYPE
|| code
== UNION_TYPE
|| code
== ENUMERAL_TYPE
)
2356 /* Used to test also that TYPE_SIZE (value) != 0.
2357 That caused warning for `struct foo;' at top level in the file. */
2359 tree name
= TYPE_NAME (value
);
2366 if (warned
!= 1 && code
!= ENUMERAL_TYPE
)
2367 /* Empty unnamed enum OK */
2369 pedwarn ("unnamed struct/union that defines no instances");
2375 t
= lookup_tag (code
, name
, 1);
2379 t
= make_node (code
);
2386 if (!warned
&& ! in_system_header
)
2388 warning ("useless keyword or type name in empty declaration");
2395 error ("two types specified in one empty declaration");
2400 pedwarn ("empty declaration");
2404 /* Construct an array declarator. EXPR is the expression inside [], or
2405 NULL_TREE. QUALS are the type qualifiers inside the [] (to be applied
2406 to the pointer to which a parameter array is converted). STATIC_P is
2407 nonzero if "static" is inside the [], zero otherwise. VLA_UNSPEC_P
2408 is nonzero is the array is [*], a VLA of unspecified length which is
2409 nevertheless a complete type (not currently implemented by GCC),
2410 zero otherwise. The declarator is constructed as an ARRAY_REF
2411 (to be decoded by grokdeclarator), whose operand 0 is what's on the
2412 left of the [] (filled by in set_array_declarator_type) and operand 1
2413 is the expression inside; whose TREE_TYPE is the type qualifiers and
2414 which has TREE_STATIC set if "static" is used. */
2417 build_array_declarator (tree expr
, tree quals
, int static_p
, int vla_unspec_p
)
2420 decl
= build_nt (ARRAY_REF
, NULL_TREE
, expr
);
2421 TREE_TYPE (decl
) = quals
;
2422 TREE_STATIC (decl
) = (static_p
? 1 : 0);
2423 if (pedantic
&& !flag_isoc99
)
2425 if (static_p
|| quals
!= NULL_TREE
)
2426 pedwarn ("ISO C90 does not support `static' or type qualifiers in parameter array declarators");
2428 pedwarn ("ISO C90 does not support `[*]' array declarators");
2431 warning ("GCC does not yet properly implement `[*]' array declarators");
2435 /* Set the type of an array declarator. DECL is the declarator, as
2436 constructed by build_array_declarator; TYPE is what appears on the left
2437 of the [] and goes in operand 0. ABSTRACT_P is nonzero if it is an
2438 abstract declarator, zero otherwise; this is used to reject static and
2439 type qualifiers in abstract declarators, where they are not in the
2443 set_array_declarator_type (tree decl
, tree type
, int abstract_p
)
2445 TREE_OPERAND (decl
, 0) = type
;
2446 if (abstract_p
&& (TREE_TYPE (decl
) != NULL_TREE
|| TREE_STATIC (decl
)))
2447 error ("static or type qualifiers in abstract declarator");
2451 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
2454 groktypename (tree typename
)
2458 if (TREE_CODE (typename
) != TREE_LIST
)
2461 split_specs_attrs (TREE_PURPOSE (typename
), &specs
, &attrs
);
2463 typename
= grokdeclarator (TREE_VALUE (typename
), specs
, TYPENAME
, 0,
2466 /* Apply attributes. */
2467 decl_attributes (&typename
, attrs
, 0);
2472 /* Return a PARM_DECL node for a given pair of specs and declarator. */
2475 groktypename_in_parm_context (tree typename
)
2477 if (TREE_CODE (typename
) != TREE_LIST
)
2479 return grokdeclarator (TREE_VALUE (typename
),
2480 TREE_PURPOSE (typename
),
2484 /* Decode a declarator in an ordinary declaration or data definition.
2485 This is called as soon as the type information and variable name
2486 have been parsed, before parsing the initializer if any.
2487 Here we create the ..._DECL node, fill in its type,
2488 and put it on the list of decls for the current context.
2489 The ..._DECL node is returned as the value.
2491 Exception: for arrays where the length is not specified,
2492 the type is left null, to be filled in by `finish_decl'.
2494 Function definitions do not come here; they go to start_function
2495 instead. However, external and forward declarations of functions
2496 do go through here. Structure field declarations are done by
2497 grokfield and not through here. */
2500 start_decl (tree declarator
, tree declspecs
, int initialized
, tree attributes
)
2505 /* An object declared as __attribute__((deprecated)) suppresses
2506 warnings of uses of other deprecated items. */
2507 if (lookup_attribute ("deprecated", attributes
))
2508 deprecated_state
= DEPRECATED_SUPPRESS
;
2510 decl
= grokdeclarator (declarator
, declspecs
,
2511 NORMAL
, initialized
, NULL
);
2513 deprecated_state
= DEPRECATED_NORMAL
;
2515 if (warn_main
> 0 && TREE_CODE (decl
) != FUNCTION_DECL
2516 && MAIN_NAME_P (DECL_NAME (decl
)))
2517 warning ("%J'%D' is usually a function", decl
, decl
);
2520 /* Is it valid for this decl to have an initializer at all?
2521 If not, set INITIALIZED to zero, which will indirectly
2522 tell `finish_decl' to ignore the initializer once it is parsed. */
2523 switch (TREE_CODE (decl
))
2526 error ("typedef `%s' is initialized (use __typeof__ instead)",
2527 IDENTIFIER_POINTER (DECL_NAME (decl
)));
2532 error ("function `%s' is initialized like a variable",
2533 IDENTIFIER_POINTER (DECL_NAME (decl
)));
2538 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
2539 error ("parameter `%s' is initialized",
2540 IDENTIFIER_POINTER (DECL_NAME (decl
)));
2545 /* Don't allow initializations for incomplete types
2546 except for arrays which might be completed by the initialization. */
2548 /* This can happen if the array size is an undefined macro. We already
2549 gave a warning, so we don't need another one. */
2550 if (TREE_TYPE (decl
) == error_mark_node
)
2552 else if (COMPLETE_TYPE_P (TREE_TYPE (decl
)))
2554 /* A complete type is ok if size is fixed. */
2556 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl
))) != INTEGER_CST
2557 || C_DECL_VARIABLE_SIZE (decl
))
2559 error ("variable-sized object may not be initialized");
2563 else if (TREE_CODE (TREE_TYPE (decl
)) != ARRAY_TYPE
)
2565 error ("variable `%s' has initializer but incomplete type",
2566 IDENTIFIER_POINTER (DECL_NAME (decl
)));
2569 else if (!COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (decl
))))
2571 error ("elements of array `%s' have incomplete type",
2572 IDENTIFIER_POINTER (DECL_NAME (decl
)));
2579 DECL_EXTERNAL (decl
) = 0;
2580 if (current_scope
== global_scope
)
2581 TREE_STATIC (decl
) = 1;
2583 /* Tell `pushdecl' this is an initialized decl
2584 even though we don't yet have the initializer expression.
2585 Also tell `finish_decl' it may store the real initializer. */
2586 DECL_INITIAL (decl
) = error_mark_node
;
2589 /* If this is a function declaration, write a record describing it to the
2590 prototypes file (if requested). */
2592 if (TREE_CODE (decl
) == FUNCTION_DECL
)
2593 gen_aux_info_record (decl
, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl
)) != 0);
2595 /* ANSI specifies that a tentative definition which is not merged with
2596 a non-tentative definition behaves exactly like a definition with an
2597 initializer equal to zero. (Section 3.7.2)
2599 -fno-common gives strict ANSI behavior, though this tends to break
2600 a large body of code that grew up without this rule.
2602 Thread-local variables are never common, since there's no entrenched
2603 body of code to break, and it allows more efficient variable references
2604 in the presence of dynamic linking. */
2606 if (TREE_CODE (decl
) == VAR_DECL
2608 && TREE_PUBLIC (decl
)
2609 && !DECL_THREAD_LOCAL (decl
)
2611 DECL_COMMON (decl
) = 1;
2613 /* Set attributes here so if duplicate decl, will have proper attributes. */
2614 decl_attributes (&decl
, attributes
, 0);
2616 if (TREE_CODE (decl
) == FUNCTION_DECL
2617 && targetm
.calls
.promote_prototypes (TREE_TYPE (decl
)))
2619 tree ce
= declarator
;
2621 if (TREE_CODE (ce
) == INDIRECT_REF
)
2622 ce
= TREE_OPERAND (declarator
, 0);
2623 if (TREE_CODE (ce
) == CALL_EXPR
)
2625 tree args
= TREE_PURPOSE (TREE_OPERAND (ce
, 1));
2626 for (; args
; args
= TREE_CHAIN (args
))
2628 tree type
= TREE_TYPE (args
);
2629 if (INTEGRAL_TYPE_P (type
)
2630 && TYPE_PRECISION (type
) < TYPE_PRECISION (integer_type_node
))
2631 DECL_ARG_TYPE (args
) = integer_type_node
;
2636 if (TREE_CODE (decl
) == FUNCTION_DECL
2637 && DECL_DECLARED_INLINE_P (decl
)
2638 && DECL_UNINLINABLE (decl
)
2639 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl
)))
2640 warning ("%Jinline function '%D' given attribute noinline", decl
, decl
);
2642 /* Add this decl to the current scope.
2643 TEM may equal DECL or it may be a previous decl of the same name. */
2644 tem
= pushdecl (decl
);
2646 /* For a local variable, define the RTL now. */
2647 if (current_scope
!= global_scope
2648 /* But not if this is a duplicate decl
2649 and we preserved the rtl from the previous one
2650 (which may or may not happen). */
2651 && !DECL_RTL_SET_P (tem
)
2652 && DECL_FILE_SCOPE_P (tem
))
2654 if (TREE_TYPE (tem
) != error_mark_node
2655 && (COMPLETE_TYPE_P (TREE_TYPE (tem
))
2656 || (TREE_CODE (TREE_TYPE (tem
)) == ARRAY_TYPE
2657 && DECL_INITIAL (tem
) != 0)))
2664 /* Finish processing of a declaration;
2665 install its initial value.
2666 If the length of an array type is not known before,
2667 it must be determined now, from the initial value, or it is an error. */
2670 finish_decl (tree decl
, tree init
, tree asmspec_tree
)
2672 tree type
= TREE_TYPE (decl
);
2673 int was_incomplete
= (DECL_SIZE (decl
) == 0);
2674 const char *asmspec
= 0;
2676 /* If a name was specified, get the string. */
2677 if (current_scope
== global_scope
)
2678 asmspec_tree
= maybe_apply_renaming_pragma (decl
, asmspec_tree
);
2680 asmspec
= TREE_STRING_POINTER (asmspec_tree
);
2682 /* If `start_decl' didn't like having an initialization, ignore it now. */
2683 if (init
!= 0 && DECL_INITIAL (decl
) == 0)
2686 /* Don't crash if parm is initialized. */
2687 if (TREE_CODE (decl
) == PARM_DECL
)
2691 store_init_value (decl
, init
);
2693 if (c_dialect_objc () && (TREE_CODE (decl
) == VAR_DECL
2694 || TREE_CODE (decl
) == FUNCTION_DECL
2695 || TREE_CODE (decl
) == FIELD_DECL
))
2696 objc_check_decl (decl
);
2698 /* Deduce size of array from initialization, if not already known. */
2699 if (TREE_CODE (type
) == ARRAY_TYPE
2700 && TYPE_DOMAIN (type
) == 0
2701 && TREE_CODE (decl
) != TYPE_DECL
)
2704 = (TREE_STATIC (decl
)
2705 /* Even if pedantic, an external linkage array
2706 may have incomplete type at first. */
2707 ? pedantic
&& !TREE_PUBLIC (decl
)
2708 : !DECL_EXTERNAL (decl
));
2710 = complete_array_type (type
, DECL_INITIAL (decl
), do_default
);
2712 /* Get the completed type made by complete_array_type. */
2713 type
= TREE_TYPE (decl
);
2716 error ("%Jinitializer fails to determine size of '%D'", decl
, decl
);
2718 else if (failure
== 2)
2721 error ("%Jarray size missing in '%D'", decl
, decl
);
2722 /* If a `static' var's size isn't known,
2723 make it extern as well as static, so it does not get
2725 If it is not `static', then do not mark extern;
2726 finish_incomplete_decl will give it a default size
2727 and it will get allocated. */
2728 else if (!pedantic
&& TREE_STATIC (decl
) && ! TREE_PUBLIC (decl
))
2729 DECL_EXTERNAL (decl
) = 1;
2732 /* TYPE_MAX_VALUE is always one less than the number of elements
2733 in the array, because we start counting at zero. Therefore,
2734 warn only if the value is less than zero. */
2735 else if (pedantic
&& TYPE_DOMAIN (type
) != 0
2736 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type
))) < 0)
2737 error ("%Jzero or negative size array '%D'", decl
, decl
);
2739 layout_decl (decl
, 0);
2742 if (TREE_CODE (decl
) == VAR_DECL
)
2744 if (DECL_SIZE (decl
) == 0 && TREE_TYPE (decl
) != error_mark_node
2745 && COMPLETE_TYPE_P (TREE_TYPE (decl
)))
2746 layout_decl (decl
, 0);
2748 if (DECL_SIZE (decl
) == 0
2749 /* Don't give an error if we already gave one earlier. */
2750 && TREE_TYPE (decl
) != error_mark_node
2751 && (TREE_STATIC (decl
)
2753 /* A static variable with an incomplete type
2754 is an error if it is initialized.
2755 Also if it is not file scope.
2756 Otherwise, let it through, but if it is not `extern'
2757 then it may cause an error message later. */
2758 (DECL_INITIAL (decl
) != 0
2759 || !DECL_FILE_SCOPE_P (decl
))
2761 /* An automatic variable with an incomplete type
2763 !DECL_EXTERNAL (decl
)))
2765 error ("%Jstorage size of '%D' isn't known", decl
, decl
);
2766 TREE_TYPE (decl
) = error_mark_node
;
2769 if ((DECL_EXTERNAL (decl
) || TREE_STATIC (decl
))
2770 && DECL_SIZE (decl
) != 0)
2772 if (TREE_CODE (DECL_SIZE (decl
)) == INTEGER_CST
)
2773 constant_expression_warning (DECL_SIZE (decl
));
2775 error ("%Jstorage size of '%D' isn't constant", decl
, decl
);
2778 if (TREE_USED (type
))
2779 TREE_USED (decl
) = 1;
2782 /* If this is a function and an assembler name is specified, reset DECL_RTL
2783 so we can give it its new name. Also, update built_in_decls if it
2784 was a normal built-in. */
2785 if (TREE_CODE (decl
) == FUNCTION_DECL
&& asmspec
)
2787 /* ASMSPEC is given, and not the name of a register. Mark the
2788 name with a star so assemble_name won't munge it. */
2789 char *starred
= alloca (strlen (asmspec
) + 2);
2791 strcpy (starred
+ 1, asmspec
);
2793 if (DECL_BUILT_IN_CLASS (decl
) == BUILT_IN_NORMAL
)
2795 tree builtin
= built_in_decls
[DECL_FUNCTION_CODE (decl
)];
2796 SET_DECL_RTL (builtin
, NULL_RTX
);
2797 SET_DECL_ASSEMBLER_NAME (builtin
, get_identifier (starred
));
2798 #ifdef TARGET_MEM_FUNCTIONS
2799 if (DECL_FUNCTION_CODE (decl
) == BUILT_IN_MEMCPY
)
2800 init_block_move_fn (starred
);
2801 else if (DECL_FUNCTION_CODE (decl
) == BUILT_IN_MEMSET
)
2802 init_block_clear_fn (starred
);
2804 if (DECL_FUNCTION_CODE (decl
) == BUILT_IN_BCOPY
)
2805 init_block_move_fn (starred
);
2806 else if (DECL_FUNCTION_CODE (decl
) == BUILT_IN_BZERO
)
2807 init_block_clear_fn (starred
);
2810 SET_DECL_RTL (decl
, NULL_RTX
);
2811 change_decl_assembler_name (decl
, get_identifier (starred
));
2814 /* If #pragma weak was used, mark the decl weak now. */
2815 if (current_scope
== global_scope
)
2816 maybe_apply_pragma_weak (decl
);
2818 /* Output the assembler code and/or RTL code for variables and functions,
2819 unless the type is an undefined structure or union.
2820 If not, it will get done when the type is completed. */
2822 if (TREE_CODE (decl
) == VAR_DECL
|| TREE_CODE (decl
) == FUNCTION_DECL
)
2824 /* This is a no-op in c-lang.c or something real in objc-act.c. */
2825 if (c_dialect_objc ())
2826 objc_check_decl (decl
);
2828 if (DECL_FILE_SCOPE_P (decl
))
2830 if (DECL_INITIAL (decl
) == NULL_TREE
2831 || DECL_INITIAL (decl
) == error_mark_node
)
2832 /* Don't output anything
2833 when a tentative file-scope definition is seen.
2834 But at end of compilation, do output code for them. */
2835 DECL_DEFER_OUTPUT (decl
) = 1;
2836 rest_of_decl_compilation (decl
, asmspec
, true, 0);
2840 /* This is a local variable. If there is an ASMSPEC, the
2841 user has requested that we handle it specially. */
2844 /* In conjunction with an ASMSPEC, the `register'
2845 keyword indicates that we should place the variable
2846 in a particular register. */
2847 if (DECL_REGISTER (decl
))
2848 DECL_C_HARD_REGISTER (decl
) = 1;
2850 /* If this is not a static variable, issue a warning.
2851 It doesn't make any sense to give an ASMSPEC for an
2852 ordinary, non-register local variable. Historically,
2853 GCC has accepted -- but ignored -- the ASMSPEC in
2855 if (TREE_CODE (decl
) == VAR_DECL
2856 && !DECL_REGISTER (decl
)
2857 && !TREE_STATIC (decl
))
2858 warning ("%Jignoring asm-specifier for non-static local "
2859 "variable '%D'", decl
, decl
);
2861 change_decl_assembler_name (decl
, get_identifier (asmspec
));
2864 if (TREE_CODE (decl
) != FUNCTION_DECL
)
2865 add_decl_stmt (decl
);
2868 if (!DECL_FILE_SCOPE_P (decl
))
2870 /* Recompute the RTL of a local array now
2871 if it used to be an incomplete type. */
2873 && ! TREE_STATIC (decl
) && ! DECL_EXTERNAL (decl
))
2875 /* If we used it already as memory, it must stay in memory. */
2876 TREE_ADDRESSABLE (decl
) = TREE_USED (decl
);
2877 /* If it's still incomplete now, no init will save it. */
2878 if (DECL_SIZE (decl
) == 0)
2879 DECL_INITIAL (decl
) = 0;
2884 /* If this was marked 'used', be sure it will be output. */
2885 if (lookup_attribute ("used", DECL_ATTRIBUTES (decl
)))
2886 mark_referenced (DECL_ASSEMBLER_NAME (decl
));
2888 if (TREE_CODE (decl
) == TYPE_DECL
)
2889 rest_of_decl_compilation (decl
, NULL
, DECL_FILE_SCOPE_P (decl
), 0);
2891 /* At the end of a declaration, throw away any variable type sizes
2892 of types defined inside that declaration. There is no use
2893 computing them in the following function definition. */
2894 if (current_scope
== global_scope
)
2895 get_pending_sizes ();
2897 /* Install a cleanup (aka destructor) if one was given. */
2898 if (TREE_CODE (decl
) == VAR_DECL
&& !TREE_STATIC (decl
))
2900 tree attr
= lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl
));
2903 static bool eh_initialized_p
;
2905 tree cleanup_id
= TREE_VALUE (TREE_VALUE (attr
));
2906 tree cleanup_decl
= lookup_name (cleanup_id
);
2909 /* Build "cleanup(&decl)" for the destructor. */
2910 cleanup
= build_unary_op (ADDR_EXPR
, decl
, 0);
2911 cleanup
= build_tree_list (NULL_TREE
, cleanup
);
2912 cleanup
= build_function_call (cleanup_decl
, cleanup
);
2914 /* Don't warn about decl unused; the cleanup uses it. */
2915 TREE_USED (decl
) = 1;
2917 /* Initialize EH, if we've been told to do so. */
2918 if (flag_exceptions
&& !eh_initialized_p
)
2920 eh_initialized_p
= true;
2921 eh_personality_libfunc
2922 = init_one_libfunc (USING_SJLJ_EXCEPTIONS
2923 ? "__gcc_personality_sj0"
2924 : "__gcc_personality_v0");
2925 using_eh_for_cleanups ();
2928 add_stmt (build_stmt (CLEANUP_STMT
, decl
, cleanup
));
2933 /* Given a parsed parameter declaration, decode it into a PARM_DECL
2934 and push that on the current scope. */
2937 push_parm_decl (tree parm
)
2941 /* Don't attempt to expand sizes while parsing this decl.
2942 (We can get here with i_s_e 1 somehow from Objective-C.) */
2943 int save_immediate_size_expand
= immediate_size_expand
;
2944 immediate_size_expand
= 0;
2946 decl
= grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm
)),
2947 TREE_PURPOSE (TREE_PURPOSE (parm
)),
2949 decl_attributes (&decl
, TREE_VALUE (parm
), 0);
2951 decl
= pushdecl (decl
);
2953 finish_decl (decl
, NULL_TREE
, NULL_TREE
);
2955 immediate_size_expand
= save_immediate_size_expand
;
2958 /* Mark all the parameter declarations to date as forward decls,
2959 shift them to the variables list, and reset the parameters list.
2960 Also diagnose use of this extension. */
2963 mark_forward_parm_decls (void)
2967 if (pedantic
&& !current_scope
->warned_forward_parm_decls
)
2969 pedwarn ("ISO C forbids forward parameter declarations");
2970 current_scope
->warned_forward_parm_decls
= true;
2973 for (parm
= current_scope
->parms
; parm
; parm
= TREE_CHAIN (parm
))
2974 TREE_ASM_WRITTEN (parm
) = 1;
2976 SCOPE_LIST_CONCAT (current_scope
, names
, current_scope
, parms
);
2977 current_scope
->parms
= 0;
2978 current_scope
->parms_last
= 0;
2981 static GTY(()) int compound_literal_number
;
2983 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
2984 literal, which may be an incomplete array type completed by the
2985 initializer; INIT is a CONSTRUCTOR that initializes the compound
2989 build_compound_literal (tree type
, tree init
)
2991 /* We do not use start_decl here because we have a type, not a declarator;
2992 and do not use finish_decl because the decl should be stored inside
2993 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_STMT. */
2994 tree decl
= build_decl (VAR_DECL
, NULL_TREE
, type
);
2997 DECL_EXTERNAL (decl
) = 0;
2998 TREE_PUBLIC (decl
) = 0;
2999 TREE_STATIC (decl
) = (current_scope
== global_scope
);
3000 DECL_CONTEXT (decl
) = current_function_decl
;
3001 TREE_USED (decl
) = 1;
3002 TREE_TYPE (decl
) = type
;
3003 TREE_READONLY (decl
) = TREE_READONLY (type
);
3004 store_init_value (decl
, init
);
3006 if (TREE_CODE (type
) == ARRAY_TYPE
&& !COMPLETE_TYPE_P (type
))
3008 int failure
= complete_array_type (type
, DECL_INITIAL (decl
), 1);
3013 type
= TREE_TYPE (decl
);
3014 if (type
== error_mark_node
|| !COMPLETE_TYPE_P (type
))
3015 return error_mark_node
;
3017 stmt
= build_stmt (DECL_STMT
, decl
);
3018 complit
= build1 (COMPOUND_LITERAL_EXPR
, TREE_TYPE (decl
), stmt
);
3019 TREE_SIDE_EFFECTS (complit
) = 1;
3021 layout_decl (decl
, 0);
3023 if (TREE_STATIC (decl
))
3025 /* This decl needs a name for the assembler output. We also need
3026 a unique suffix to be added to the name. */
3029 ASM_FORMAT_PRIVATE_NAME (name
, "__compound_literal",
3030 compound_literal_number
);
3031 compound_literal_number
++;
3032 DECL_NAME (decl
) = get_identifier (name
);
3033 DECL_DEFER_OUTPUT (decl
) = 1;
3034 DECL_COMDAT (decl
) = 1;
3035 DECL_ARTIFICIAL (decl
) = 1;
3037 rest_of_decl_compilation (decl
, NULL
, 1, 0);
3043 /* Make TYPE a complete type based on INITIAL_VALUE.
3044 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3045 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3048 complete_array_type (tree type
, tree initial_value
, int do_default
)
3050 tree maxindex
= NULL_TREE
;
3055 /* Note MAXINDEX is really the maximum index,
3056 one less than the size. */
3057 if (TREE_CODE (initial_value
) == STRING_CST
)
3060 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value
)));
3061 maxindex
= build_int_2 ((TREE_STRING_LENGTH (initial_value
)
3064 else if (TREE_CODE (initial_value
) == CONSTRUCTOR
)
3066 tree elts
= CONSTRUCTOR_ELTS (initial_value
);
3067 maxindex
= build_int_2 (-1, -1);
3068 for (; elts
; elts
= TREE_CHAIN (elts
))
3070 if (TREE_PURPOSE (elts
))
3071 maxindex
= TREE_PURPOSE (elts
);
3073 maxindex
= fold (build (PLUS_EXPR
, integer_type_node
,
3074 maxindex
, integer_one_node
));
3076 maxindex
= copy_node (maxindex
);
3080 /* Make an error message unless that happened already. */
3081 if (initial_value
!= error_mark_node
)
3084 /* Prevent further error messages. */
3085 maxindex
= build_int_2 (0, 0);
3092 maxindex
= build_int_2 (0, 0);
3098 TYPE_DOMAIN (type
) = build_index_type (maxindex
);
3099 if (!TREE_TYPE (maxindex
))
3100 TREE_TYPE (maxindex
) = TYPE_DOMAIN (type
);
3103 /* Lay out the type now that we can get the real answer. */
3110 /* Determine whether TYPE is a structure with a flexible array member,
3111 or a union containing such a structure (possibly recursively). */
3114 flexible_array_type_p (tree type
)
3117 switch (TREE_CODE (type
))
3120 x
= TYPE_FIELDS (type
);
3123 while (TREE_CHAIN (x
) != NULL_TREE
)
3125 if (TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
3126 && TYPE_SIZE (TREE_TYPE (x
)) == NULL_TREE
3127 && TYPE_DOMAIN (TREE_TYPE (x
)) != NULL_TREE
3128 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x
))) == NULL_TREE
)
3132 for (x
= TYPE_FIELDS (type
); x
!= NULL_TREE
; x
= TREE_CHAIN (x
))
3134 if (flexible_array_type_p (TREE_TYPE (x
)))
3143 /* Performs sanity checks on the TYPE and WIDTH of the bit-field NAME,
3144 replacing with appropriate values if they are invalid. */
3146 check_bitfield_type_and_width (tree
*type
, tree
*width
, const char *orig_name
)
3149 unsigned int max_width
;
3150 unsigned HOST_WIDE_INT w
;
3151 const char *name
= orig_name
? orig_name
: _("<anonymous>");
3154 STRIP_NOPS (*width
);
3156 /* Detect and ignore out of range field width and process valid
3158 if (TREE_CODE (*width
) != INTEGER_CST
)
3160 error ("bit-field `%s' width not an integer constant", name
);
3161 *width
= integer_one_node
;
3165 constant_expression_warning (*width
);
3166 if (tree_int_cst_sgn (*width
) < 0)
3168 error ("negative width in bit-field `%s'", name
);
3169 *width
= integer_one_node
;
3171 else if (integer_zerop (*width
) && orig_name
)
3173 error ("zero width for bit-field `%s'", name
);
3174 *width
= integer_one_node
;
3178 /* Detect invalid bit-field type. */
3179 if (TREE_CODE (*type
) != INTEGER_TYPE
3180 && TREE_CODE (*type
) != BOOLEAN_TYPE
3181 && TREE_CODE (*type
) != ENUMERAL_TYPE
)
3183 error ("bit-field `%s' has invalid type", name
);
3184 *type
= unsigned_type_node
;
3187 type_mv
= TYPE_MAIN_VARIANT (*type
);
3189 && type_mv
!= integer_type_node
3190 && type_mv
!= unsigned_type_node
3191 && type_mv
!= boolean_type_node
)
3192 pedwarn ("type of bit-field `%s' is a GCC extension", name
);
3194 if (type_mv
== boolean_type_node
)
3195 max_width
= CHAR_TYPE_SIZE
;
3197 max_width
= TYPE_PRECISION (*type
);
3199 if (0 < compare_tree_int (*width
, max_width
))
3201 error ("width of `%s' exceeds its type", name
);
3203 *width
= build_int_2 (w
, 0);
3206 w
= tree_low_cst (*width
, 1);
3208 if (TREE_CODE (*type
) == ENUMERAL_TYPE
3209 && (w
< min_precision (TYPE_MIN_VALUE (*type
), TREE_UNSIGNED (*type
))
3210 || w
< min_precision (TYPE_MAX_VALUE (*type
), TREE_UNSIGNED (*type
))))
3211 warning ("`%s' is narrower than values of its type", name
);
3214 /* Given declspecs and a declarator,
3215 determine the name and type of the object declared
3216 and construct a ..._DECL node for it.
3217 (In one case we can return a ..._TYPE node instead.
3218 For invalid input we sometimes return 0.)
3220 DECLSPECS is a chain of tree_list nodes whose value fields
3221 are the storage classes and type specifiers.
3223 DECL_CONTEXT says which syntactic context this declaration is in:
3224 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3225 FUNCDEF for a function definition. Like NORMAL but a few different
3226 error messages in each case. Return value may be zero meaning
3227 this definition is too screwy to try to parse.
3228 PARM for a parameter declaration (either within a function prototype
3229 or before a function body). Make a PARM_DECL, or return void_type_node.
3230 TYPENAME if for a typename (in a cast or sizeof).
3231 Don't make a DECL node; just return the ..._TYPE node.
3232 FIELD for a struct or union field; make a FIELD_DECL.
3233 INITIALIZED is 1 if the decl has an initializer.
3234 WIDTH is non-NULL for bit-fields, and is a pointer to an INTEGER_CST node
3235 representing the width of the bit-field.
3237 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3238 It may also be so in the PARM case, for a prototype where the
3239 argument type is specified but not the name.
3241 This function is where the complicated C meanings of `static'
3242 and `extern' are interpreted. */
3245 grokdeclarator (tree declarator
, tree declspecs
,
3246 enum decl_context decl_context
, int initialized
, tree
*width
)
3250 tree type
= NULL_TREE
;
3255 int type_quals
= TYPE_UNQUALIFIED
;
3257 int explicit_int
= 0;
3258 int explicit_char
= 0;
3259 int defaulted_int
= 0;
3260 tree typedef_decl
= 0;
3261 const char *name
, *orig_name
;
3262 tree typedef_type
= 0;
3263 int funcdef_flag
= 0;
3264 enum tree_code innermost_code
= ERROR_MARK
;
3265 int size_varies
= 0;
3266 tree decl_attr
= NULL_TREE
;
3267 tree array_ptr_quals
= NULL_TREE
;
3268 int array_parm_static
= 0;
3269 tree returned_attrs
= NULL_TREE
;
3270 bool bitfield
= width
!= NULL
;
3273 if (decl_context
== FUNCDEF
)
3274 funcdef_flag
= 1, decl_context
= NORMAL
;
3276 /* Look inside a declarator for the name being declared
3277 and get it as a string, for an error message. */
3279 tree decl
= declarator
;
3283 switch (TREE_CODE (decl
))
3288 innermost_code
= TREE_CODE (decl
);
3289 decl
= TREE_OPERAND (decl
, 0);
3293 decl
= TREE_VALUE (decl
);
3296 case IDENTIFIER_NODE
:
3297 name
= IDENTIFIER_POINTER (decl
);
3309 /* A function definition's declarator must have the form of
3310 a function declarator. */
3312 if (funcdef_flag
&& innermost_code
!= CALL_EXPR
)
3315 /* If this looks like a function definition, make it one,
3316 even if it occurs where parms are expected.
3317 Then store_parm_decls will reject it and not use it as a parm. */
3318 if (decl_context
== NORMAL
&& !funcdef_flag
3319 && current_scope
->parm_flag
)
3320 decl_context
= PARM
;
3322 /* Look through the decl specs and record which ones appear.
3323 Some typespecs are defined as built-in typenames.
3324 Others, the ones that are modifiers of other types,
3325 are represented by bits in SPECBITS: set the bits for
3326 the modifiers that appear. Storage class keywords are also in SPECBITS.
3328 If there is a typedef name or a type, store the type in TYPE.
3329 This includes builtin typedefs such as `int'.
3331 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
3332 and did not come from a user typedef.
3334 Set LONGLONG if `long' is mentioned twice. */
3336 for (spec
= declspecs
; spec
; spec
= TREE_CHAIN (spec
))
3338 tree id
= TREE_VALUE (spec
);
3340 /* If the entire declaration is itself tagged as deprecated then
3341 suppress reports of deprecated items. */
3342 if (id
&& TREE_DEPRECATED (id
))
3344 if (deprecated_state
!= DEPRECATED_SUPPRESS
)
3345 warn_deprecated_use (id
);
3348 if (id
== ridpointers
[(int) RID_INT
])
3350 if (id
== ridpointers
[(int) RID_CHAR
])
3353 if (TREE_CODE (id
) == IDENTIFIER_NODE
&& C_IS_RESERVED_WORD (id
))
3355 enum rid i
= C_RID_CODE (id
);
3356 if ((int) i
<= (int) RID_LAST_MODIFIER
)
3358 if (i
== RID_LONG
&& (specbits
& (1 << (int) RID_LONG
)))
3361 error ("`long long long' is too long for GCC");
3364 if (pedantic
&& !flag_isoc99
&& ! in_system_header
3366 pedwarn ("ISO C90 does not support `long long'");
3370 else if (specbits
& (1 << (int) i
))
3372 if (i
== RID_CONST
|| i
== RID_VOLATILE
|| i
== RID_RESTRICT
)
3375 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id
));
3378 error ("duplicate `%s'", IDENTIFIER_POINTER (id
));
3381 /* Diagnose "__thread extern". Recall that this list
3382 is in the reverse order seen in the text. */
3384 && (specbits
& (1 << (int) RID_EXTERN
3385 | 1 << (int) RID_STATIC
)))
3387 if (specbits
& 1 << (int) RID_EXTERN
)
3388 error ("`__thread' before `extern'");
3390 error ("`__thread' before `static'");
3393 specbits
|= 1 << (int) i
;
3398 error ("two or more data types in declaration of `%s'", name
);
3399 /* Actual typedefs come to us as TYPE_DECL nodes. */
3400 else if (TREE_CODE (id
) == TYPE_DECL
)
3402 if (TREE_TYPE (id
) == error_mark_node
)
3403 ; /* Allow the type to default to int to avoid cascading errors. */
3406 type
= TREE_TYPE (id
);
3407 decl_attr
= DECL_ATTRIBUTES (id
);
3411 /* Built-in types come as identifiers. */
3412 else if (TREE_CODE (id
) == IDENTIFIER_NODE
)
3414 tree t
= lookup_name (id
);
3415 if (TREE_TYPE (t
) == error_mark_node
)
3417 else if (!t
|| TREE_CODE (t
) != TYPE_DECL
)
3418 error ("`%s' fails to be a typedef or built in type",
3419 IDENTIFIER_POINTER (id
));
3422 type
= TREE_TYPE (t
);
3426 else if (TREE_CODE (id
) != ERROR_MARK
)
3433 typedef_type
= type
;
3435 size_varies
= C_TYPE_VARIABLE_SIZE (type
);
3437 /* No type at all: default to `int', and set DEFAULTED_INT
3438 because it was not a user-defined typedef. */
3442 if ((! (specbits
& ((1 << (int) RID_LONG
) | (1 << (int) RID_SHORT
)
3443 | (1 << (int) RID_SIGNED
)
3444 | (1 << (int) RID_UNSIGNED
)
3445 | (1 << (int) RID_COMPLEX
))))
3446 /* Don't warn about typedef foo = bar. */
3447 && ! (specbits
& (1 << (int) RID_TYPEDEF
) && initialized
)
3448 && ! in_system_header
)
3450 /* Issue a warning if this is an ISO C 99 program or if -Wreturn-type
3451 and this is a function, or if -Wimplicit; prefer the former
3452 warning since it is more explicit. */
3453 if ((warn_implicit_int
|| warn_return_type
|| flag_isoc99
)
3455 warn_about_return_type
= 1;
3456 else if (warn_implicit_int
|| flag_isoc99
)
3457 pedwarn_c99 ("type defaults to `int' in declaration of `%s'",
3462 type
= integer_type_node
;
3465 /* Now process the modifiers that were specified
3466 and check for invalid combinations. */
3468 /* Long double is a special combination. */
3470 if ((specbits
& 1 << (int) RID_LONG
) && ! longlong
3471 && TYPE_MAIN_VARIANT (type
) == double_type_node
)
3473 specbits
&= ~(1 << (int) RID_LONG
);
3474 type
= long_double_type_node
;
3477 /* Check all other uses of type modifiers. */
3479 if (specbits
& ((1 << (int) RID_LONG
) | (1 << (int) RID_SHORT
)
3480 | (1 << (int) RID_UNSIGNED
) | (1 << (int) RID_SIGNED
)))
3484 if ((specbits
& 1 << (int) RID_LONG
)
3485 && (specbits
& 1 << (int) RID_SHORT
))
3486 error ("both long and short specified for `%s'", name
);
3487 else if (((specbits
& 1 << (int) RID_LONG
)
3488 || (specbits
& 1 << (int) RID_SHORT
))
3490 error ("long or short specified with char for `%s'", name
);
3491 else if (((specbits
& 1 << (int) RID_LONG
)
3492 || (specbits
& 1 << (int) RID_SHORT
))
3493 && TREE_CODE (type
) == REAL_TYPE
)
3495 static int already
= 0;
3497 error ("long or short specified with floating type for `%s'", name
);
3498 if (! already
&& ! pedantic
)
3500 error ("the only valid combination is `long double'");
3504 else if ((specbits
& 1 << (int) RID_SIGNED
)
3505 && (specbits
& 1 << (int) RID_UNSIGNED
))
3506 error ("both signed and unsigned specified for `%s'", name
);
3507 else if (TREE_CODE (type
) != INTEGER_TYPE
)
3508 error ("long, short, signed or unsigned invalid for `%s'", name
);
3512 if (!explicit_int
&& !defaulted_int
&& !explicit_char
)
3514 error ("long, short, signed or unsigned used invalidly for `%s'",
3520 /* Discard the type modifiers if they are invalid. */
3523 specbits
&= ~((1 << (int) RID_LONG
) | (1 << (int) RID_SHORT
)
3524 | (1 << (int) RID_UNSIGNED
) | (1 << (int) RID_SIGNED
));
3529 if ((specbits
& (1 << (int) RID_COMPLEX
))
3530 && TREE_CODE (type
) != INTEGER_TYPE
&& TREE_CODE (type
) != REAL_TYPE
)
3532 error ("complex invalid for `%s'", name
);
3533 specbits
&= ~(1 << (int) RID_COMPLEX
);
3536 /* Decide whether an integer type is signed or not.
3537 Optionally treat bit-fields as signed by default. */
3538 if (specbits
& 1 << (int) RID_UNSIGNED
3539 || (bitfield
&& ! flag_signed_bitfields
3540 && (explicit_int
|| defaulted_int
|| explicit_char
3541 /* A typedef for plain `int' without `signed'
3542 can be controlled just like plain `int'. */
3543 || ! (typedef_decl
!= 0
3544 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl
)))
3545 && TREE_CODE (type
) != ENUMERAL_TYPE
3546 && !(specbits
& 1 << (int) RID_SIGNED
)))
3549 type
= long_long_unsigned_type_node
;
3550 else if (specbits
& 1 << (int) RID_LONG
)
3551 type
= long_unsigned_type_node
;
3552 else if (specbits
& 1 << (int) RID_SHORT
)
3553 type
= short_unsigned_type_node
;
3554 else if (type
== char_type_node
)
3555 type
= unsigned_char_type_node
;
3556 else if (typedef_decl
)
3557 type
= c_common_unsigned_type (type
);
3559 type
= unsigned_type_node
;
3561 else if ((specbits
& 1 << (int) RID_SIGNED
)
3562 && type
== char_type_node
)
3563 type
= signed_char_type_node
;
3565 type
= long_long_integer_type_node
;
3566 else if (specbits
& 1 << (int) RID_LONG
)
3567 type
= long_integer_type_node
;
3568 else if (specbits
& 1 << (int) RID_SHORT
)
3569 type
= short_integer_type_node
;
3571 if (specbits
& 1 << (int) RID_COMPLEX
)
3573 if (pedantic
&& !flag_isoc99
)
3574 pedwarn ("ISO C90 does not support complex types");
3575 /* If we just have "complex", it is equivalent to
3576 "complex double", but if any modifiers at all are specified it is
3577 the complex form of TYPE. E.g, "complex short" is
3578 "complex short int". */
3580 if (defaulted_int
&& ! longlong
3581 && ! (specbits
& ((1 << (int) RID_LONG
) | (1 << (int) RID_SHORT
)
3582 | (1 << (int) RID_SIGNED
)
3583 | (1 << (int) RID_UNSIGNED
))))
3586 pedwarn ("ISO C does not support plain `complex' meaning `double complex'");
3587 type
= complex_double_type_node
;
3589 else if (type
== integer_type_node
)
3592 pedwarn ("ISO C does not support complex integer types");
3593 type
= complex_integer_type_node
;
3595 else if (type
== float_type_node
)
3596 type
= complex_float_type_node
;
3597 else if (type
== double_type_node
)
3598 type
= complex_double_type_node
;
3599 else if (type
== long_double_type_node
)
3600 type
= complex_long_double_type_node
;
3604 pedwarn ("ISO C does not support complex integer types");
3605 type
= build_complex_type (type
);
3609 /* Check the type and width of a bit-field. */
3611 check_bitfield_type_and_width (&type
, width
, orig_name
);
3613 /* Figure out the type qualifiers for the declaration. There are
3614 two ways a declaration can become qualified. One is something
3615 like `const int i' where the `const' is explicit. Another is
3616 something like `typedef const int CI; CI i' where the type of the
3617 declaration contains the `const'. A third possibility is that
3618 there is a type qualifier on the element type of a typedefed
3619 array type, in which case we should extract that qualifier so
3620 that c_apply_type_quals_to_decls receives the full list of
3621 qualifiers to work with (C90 is not entirely clear about whether
3622 duplicate qualifiers should be diagnosed in this case, but it
3623 seems most appropriate to do so). */
3624 element_type
= strip_array_types (type
);
3625 constp
= !! (specbits
& 1 << (int) RID_CONST
) + TYPE_READONLY (element_type
);
3627 = !! (specbits
& 1 << (int) RID_RESTRICT
) + TYPE_RESTRICT (element_type
);
3629 = !! (specbits
& 1 << (int) RID_VOLATILE
) + TYPE_VOLATILE (element_type
);
3630 inlinep
= !! (specbits
& (1 << (int) RID_INLINE
));
3631 if (constp
> 1 && ! flag_isoc99
)
3632 pedwarn ("duplicate `const'");
3633 if (restrictp
> 1 && ! flag_isoc99
)
3634 pedwarn ("duplicate `restrict'");
3635 if (volatilep
> 1 && ! flag_isoc99
)
3636 pedwarn ("duplicate `volatile'");
3637 if (! flag_gen_aux_info
&& (TYPE_QUALS (type
)))
3638 type
= TYPE_MAIN_VARIANT (type
);
3639 type_quals
= ((constp
? TYPE_QUAL_CONST
: 0)
3640 | (restrictp
? TYPE_QUAL_RESTRICT
: 0)
3641 | (volatilep
? TYPE_QUAL_VOLATILE
: 0));
3643 /* Warn if two storage classes are given. Default to `auto'. */
3648 if (specbits
& 1 << (int) RID_AUTO
) nclasses
++;
3649 if (specbits
& 1 << (int) RID_STATIC
) nclasses
++;
3650 if (specbits
& 1 << (int) RID_EXTERN
) nclasses
++;
3651 if (specbits
& 1 << (int) RID_REGISTER
) nclasses
++;
3652 if (specbits
& 1 << (int) RID_TYPEDEF
) nclasses
++;
3654 /* "static __thread" and "extern __thread" are allowed. */
3655 if ((specbits
& (1 << (int) RID_THREAD
3656 | 1 << (int) RID_STATIC
3657 | 1 << (int) RID_EXTERN
)) == (1 << (int) RID_THREAD
))
3660 /* Warn about storage classes that are invalid for certain
3661 kinds of declarations (parameters, typenames, etc.). */
3664 error ("multiple storage classes in declaration of `%s'", name
);
3665 else if (funcdef_flag
3667 & ((1 << (int) RID_REGISTER
)
3668 | (1 << (int) RID_AUTO
)
3669 | (1 << (int) RID_TYPEDEF
)
3670 | (1 << (int) RID_THREAD
))))
3672 if (specbits
& 1 << (int) RID_AUTO
3673 && (pedantic
|| current_scope
== global_scope
))
3674 pedwarn ("function definition declared `auto'");
3675 if (specbits
& 1 << (int) RID_REGISTER
)
3676 error ("function definition declared `register'");
3677 if (specbits
& 1 << (int) RID_TYPEDEF
)
3678 error ("function definition declared `typedef'");
3679 if (specbits
& 1 << (int) RID_THREAD
)
3680 error ("function definition declared `__thread'");
3681 specbits
&= ~((1 << (int) RID_TYPEDEF
) | (1 << (int) RID_REGISTER
)
3682 | (1 << (int) RID_AUTO
) | (1 << (int) RID_THREAD
));
3684 else if (decl_context
!= NORMAL
&& nclasses
> 0)
3686 if (decl_context
== PARM
&& specbits
& 1 << (int) RID_REGISTER
)
3690 switch (decl_context
)
3693 error ("storage class specified for structure field `%s'",
3697 error ("storage class specified for parameter `%s'", name
);
3700 error ("storage class specified for typename");
3703 specbits
&= ~((1 << (int) RID_TYPEDEF
) | (1 << (int) RID_REGISTER
)
3704 | (1 << (int) RID_AUTO
) | (1 << (int) RID_STATIC
)
3705 | (1 << (int) RID_EXTERN
) | (1 << (int) RID_THREAD
));
3708 else if (specbits
& 1 << (int) RID_EXTERN
&& initialized
&& ! funcdef_flag
)
3710 /* `extern' with initialization is invalid if not at file scope. */
3711 if (current_scope
== global_scope
)
3712 warning ("`%s' initialized and declared `extern'", name
);
3714 error ("`%s' has both `extern' and initializer", name
);
3716 else if (current_scope
== global_scope
)
3718 if (specbits
& 1 << (int) RID_AUTO
)
3719 error ("file-scope declaration of `%s' specifies `auto'", name
);
3723 if (specbits
& 1 << (int) RID_EXTERN
&& funcdef_flag
)
3724 error ("nested function `%s' declared `extern'", name
);
3725 else if ((specbits
& (1 << (int) RID_THREAD
3726 | 1 << (int) RID_EXTERN
3727 | 1 << (int) RID_STATIC
))
3728 == (1 << (int) RID_THREAD
))
3730 error ("function-scope `%s' implicitly auto and declared `__thread'",
3732 specbits
&= ~(1 << (int) RID_THREAD
);
3737 /* Now figure out the structure of the declarator proper.
3738 Descend through it, creating more complex types, until we reach
3739 the declared identifier (or NULL_TREE, in an absolute declarator). */
3741 while (declarator
&& TREE_CODE (declarator
) != IDENTIFIER_NODE
)
3743 if (type
== error_mark_node
)
3745 declarator
= TREE_OPERAND (declarator
, 0);
3749 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
3750 an INDIRECT_REF (for *...),
3751 a CALL_EXPR (for ...(...)),
3752 a TREE_LIST (for nested attributes),
3753 an identifier (for the name being declared)
3754 or a null pointer (for the place in an absolute declarator
3755 where the name was omitted).
3756 For the last two cases, we have just exited the loop.
3758 At this point, TYPE is the type of elements of an array,
3759 or for a function to return, or for a pointer to point to.
3760 After this sequence of ifs, TYPE is the type of the
3761 array or function or pointer, and DECLARATOR has had its
3762 outermost layer removed. */
3764 if (array_ptr_quals
!= NULL_TREE
|| array_parm_static
)
3766 /* Only the innermost declarator (making a parameter be of
3767 array type which is converted to pointer type)
3768 may have static or type qualifiers. */
3769 error ("static or type qualifiers in non-parameter array declarator");
3770 array_ptr_quals
= NULL_TREE
;
3771 array_parm_static
= 0;
3774 if (TREE_CODE (declarator
) == TREE_LIST
)
3776 /* We encode a declarator with embedded attributes using
3778 tree attrs
= TREE_PURPOSE (declarator
);
3781 declarator
= TREE_VALUE (declarator
);
3782 inner_decl
= declarator
;
3783 while (inner_decl
!= NULL_TREE
3784 && TREE_CODE (inner_decl
) == TREE_LIST
)
3785 inner_decl
= TREE_VALUE (inner_decl
);
3786 if (inner_decl
== NULL_TREE
3787 || TREE_CODE (inner_decl
) == IDENTIFIER_NODE
)
3788 attr_flags
|= (int) ATTR_FLAG_DECL_NEXT
;
3789 else if (TREE_CODE (inner_decl
) == CALL_EXPR
)
3790 attr_flags
|= (int) ATTR_FLAG_FUNCTION_NEXT
;
3791 else if (TREE_CODE (inner_decl
) == ARRAY_REF
)
3792 attr_flags
|= (int) ATTR_FLAG_ARRAY_NEXT
;
3793 returned_attrs
= decl_attributes (&type
,
3794 chainon (returned_attrs
, attrs
),
3797 else if (TREE_CODE (declarator
) == ARRAY_REF
)
3799 tree itype
= NULL_TREE
;
3800 tree size
= TREE_OPERAND (declarator
, 1);
3801 /* The index is a signed object `sizetype' bits wide. */
3802 tree index_type
= c_common_signed_type (sizetype
);
3804 array_ptr_quals
= TREE_TYPE (declarator
);
3805 array_parm_static
= TREE_STATIC (declarator
);
3807 declarator
= TREE_OPERAND (declarator
, 0);
3809 /* Check for some types that there cannot be arrays of. */
3811 if (VOID_TYPE_P (type
))
3813 error ("declaration of `%s' as array of voids", name
);
3814 type
= error_mark_node
;
3817 if (TREE_CODE (type
) == FUNCTION_TYPE
)
3819 error ("declaration of `%s' as array of functions", name
);
3820 type
= error_mark_node
;
3823 if (pedantic
&& flexible_array_type_p (type
))
3824 pedwarn ("invalid use of structure with flexible array member");
3826 if (size
== error_mark_node
)
3827 type
= error_mark_node
;
3829 if (type
== error_mark_node
)
3832 /* If size was specified, set ITYPE to a range-type for that size.
3833 Otherwise, ITYPE remains null. finish_decl may figure it out
3834 from an initial value. */
3838 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
3839 STRIP_TYPE_NOPS (size
);
3841 if (! INTEGRAL_TYPE_P (TREE_TYPE (size
)))
3843 error ("size of array `%s' has non-integer type", name
);
3844 size
= integer_one_node
;
3847 if (pedantic
&& integer_zerop (size
))
3848 pedwarn ("ISO C forbids zero-size array `%s'", name
);
3850 if (TREE_CODE (size
) == INTEGER_CST
)
3852 constant_expression_warning (size
);
3853 if (tree_int_cst_sgn (size
) < 0)
3855 error ("size of array `%s' is negative", name
);
3856 size
= integer_one_node
;
3861 /* Make sure the array size remains visibly nonconstant
3862 even if it is (eg) a const variable with known value. */
3865 if (!flag_isoc99
&& pedantic
)
3867 if (TREE_CONSTANT (size
))
3868 pedwarn ("ISO C90 forbids array `%s' whose size can't be evaluated",
3871 pedwarn ("ISO C90 forbids variable-size array `%s'",
3876 if (integer_zerop (size
))
3878 /* A zero-length array cannot be represented with an
3879 unsigned index type, which is what we'll get with
3880 build_index_type. Create an open-ended range instead. */
3881 itype
= build_range_type (sizetype
, size
, NULL_TREE
);
3885 /* Compute the maximum valid index, that is, size - 1.
3886 Do the calculation in index_type, so that if it is
3887 a variable the computations will be done in the
3889 itype
= fold (build (MINUS_EXPR
, index_type
,
3890 convert (index_type
, size
),
3891 convert (index_type
, size_one_node
)));
3893 /* If that overflowed, the array is too big.
3894 ??? While a size of INT_MAX+1 technically shouldn't
3895 cause an overflow (because we subtract 1), the overflow
3896 is recorded during the conversion to index_type, before
3897 the subtraction. Handling this case seems like an
3898 unnecessary complication. */
3899 if (TREE_OVERFLOW (itype
))
3901 error ("size of array `%s' is too large", name
);
3902 type
= error_mark_node
;
3908 /* We must be able to distinguish the
3909 SAVE_EXPR_CONTEXT for the variably-sized type
3910 so that we can set it correctly in
3911 set_save_expr_context. The convention is
3912 that all SAVE_EXPRs that need to be reset
3913 have NULL_TREE for their SAVE_EXPR_CONTEXT. */
3914 tree cfd
= current_function_decl
;
3915 if (decl_context
== PARM
)
3916 current_function_decl
= NULL_TREE
;
3917 itype
= variable_size (itype
);
3918 if (decl_context
== PARM
)
3919 current_function_decl
= cfd
;
3921 itype
= build_index_type (itype
);
3924 else if (decl_context
== FIELD
)
3926 if (pedantic
&& !flag_isoc99
&& !in_system_header
)
3927 pedwarn ("ISO C90 does not support flexible array members");
3929 /* ISO C99 Flexible array members are effectively identical
3930 to GCC's zero-length array extension. */
3931 itype
= build_range_type (sizetype
, size_zero_node
, NULL_TREE
);
3934 /* If pedantic, complain about arrays of incomplete types. */
3936 if (pedantic
&& !COMPLETE_TYPE_P (type
))
3937 pedwarn ("array type has incomplete element type");
3939 /* Build the array type itself, then merge any constancy or
3940 volatility into the target type. We must do it in this order
3941 to ensure that the TYPE_MAIN_VARIANT field of the array type
3942 is set correctly. */
3944 type
= build_array_type (type
, itype
);
3946 type
= c_build_qualified_type (type
, type_quals
);
3949 C_TYPE_VARIABLE_SIZE (type
) = 1;
3951 /* The GCC extension for zero-length arrays differs from
3952 ISO flexible array members in that sizeof yields zero. */
3953 if (size
&& integer_zerop (size
))
3956 TYPE_SIZE (type
) = bitsize_zero_node
;
3957 TYPE_SIZE_UNIT (type
) = size_zero_node
;
3959 if (decl_context
!= PARM
3960 && (array_ptr_quals
!= NULL_TREE
|| array_parm_static
))
3962 error ("static or type qualifiers in non-parameter array declarator");
3963 array_ptr_quals
= NULL_TREE
;
3964 array_parm_static
= 0;
3967 else if (TREE_CODE (declarator
) == CALL_EXPR
)
3971 /* Declaring a function type.
3972 Make sure we have a valid type for the function to return. */
3973 if (type
== error_mark_node
)
3978 /* Warn about some types functions can't return. */
3980 if (TREE_CODE (type
) == FUNCTION_TYPE
)
3982 error ("`%s' declared as function returning a function", name
);
3983 type
= integer_type_node
;
3985 if (TREE_CODE (type
) == ARRAY_TYPE
)
3987 error ("`%s' declared as function returning an array", name
);
3988 type
= integer_type_node
;
3991 /* Construct the function type and go to the next
3992 inner layer of declarator. */
3994 arg_types
= grokparms (TREE_OPERAND (declarator
, 1),
3996 /* Say it's a definition
3997 only for the CALL_EXPR
3998 closest to the identifier. */
3999 && TREE_CODE (TREE_OPERAND (declarator
, 0)) == IDENTIFIER_NODE
);
4000 /* Type qualifiers before the return type of the function
4001 qualify the return type, not the function type. */
4004 /* Type qualifiers on a function return type are normally
4005 permitted by the standard but have no effect, so give a
4006 warning at -Wextra. Qualifiers on a void return type have
4007 meaning as a GNU extension, and are banned on function
4008 definitions in ISO C. FIXME: strictly we shouldn't
4009 pedwarn for qualified void return types except on function
4010 definitions, but not doing so could lead to the undesirable
4011 state of a "volatile void" function return type not being
4012 warned about, and a use of the function being compiled
4013 with GNU semantics, with no diagnostics under -pedantic. */
4014 if (VOID_TYPE_P (type
) && pedantic
&& !in_system_header
)
4015 pedwarn ("ISO C forbids qualified void function return type");
4016 else if (extra_warnings
4017 && !(VOID_TYPE_P (type
)
4018 && type_quals
== TYPE_QUAL_VOLATILE
))
4019 warning ("type qualifiers ignored on function return type");
4021 type
= c_build_qualified_type (type
, type_quals
);
4023 type_quals
= TYPE_UNQUALIFIED
;
4025 type
= build_function_type (type
, arg_types
);
4026 declarator
= TREE_OPERAND (declarator
, 0);
4028 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4029 the formal parameter list of this FUNCTION_TYPE to point to
4030 the FUNCTION_TYPE node itself. */
4035 for (link
= last_function_parm_tags
;
4037 link
= TREE_CHAIN (link
))
4038 TYPE_CONTEXT (TREE_VALUE (link
)) = type
;
4041 else if (TREE_CODE (declarator
) == INDIRECT_REF
)
4043 /* Merge any constancy or volatility into the target type
4046 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
4048 pedwarn ("ISO C forbids qualified function types");
4050 type
= c_build_qualified_type (type
, type_quals
);
4051 type_quals
= TYPE_UNQUALIFIED
;
4054 type
= build_pointer_type (type
);
4056 /* Process a list of type modifier keywords
4057 (such as const or volatile) that were given inside the `*'. */
4059 if (TREE_TYPE (declarator
))
4067 for (typemodlist
= TREE_TYPE (declarator
); typemodlist
;
4068 typemodlist
= TREE_CHAIN (typemodlist
))
4070 tree qualifier
= TREE_VALUE (typemodlist
);
4072 if (C_IS_RESERVED_WORD (qualifier
))
4074 if (C_RID_CODE (qualifier
) == RID_CONST
)
4076 else if (C_RID_CODE (qualifier
) == RID_VOLATILE
)
4078 else if (C_RID_CODE (qualifier
) == RID_RESTRICT
)
4088 error ("invalid type modifier within pointer declarator");
4089 if (constp
> 1 && ! flag_isoc99
)
4090 pedwarn ("duplicate `const'");
4091 if (volatilep
> 1 && ! flag_isoc99
)
4092 pedwarn ("duplicate `volatile'");
4093 if (restrictp
> 1 && ! flag_isoc99
)
4094 pedwarn ("duplicate `restrict'");
4096 type_quals
= ((constp
? TYPE_QUAL_CONST
: 0)
4097 | (restrictp
? TYPE_QUAL_RESTRICT
: 0)
4098 | (volatilep
? TYPE_QUAL_VOLATILE
: 0));
4101 declarator
= TREE_OPERAND (declarator
, 0);
4108 /* Now TYPE has the actual type. */
4110 /* Did array size calculations overflow? */
4112 if (TREE_CODE (type
) == ARRAY_TYPE
4113 && COMPLETE_TYPE_P (type
)
4114 && TREE_OVERFLOW (TYPE_SIZE (type
)))
4116 error ("size of array `%s' is too large", name
);
4117 /* If we proceed with the array type as it is, we'll eventually
4118 crash in tree_low_cst(). */
4119 type
= error_mark_node
;
4122 /* If this is declaring a typedef name, return a TYPE_DECL. */
4124 if (specbits
& (1 << (int) RID_TYPEDEF
))
4127 /* Note that the grammar rejects storage classes
4128 in typenames, fields or parameters */
4129 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
4131 pedwarn ("ISO C forbids qualified function types");
4133 type
= c_build_qualified_type (type
, type_quals
);
4134 decl
= build_decl (TYPE_DECL
, declarator
, type
);
4135 if ((specbits
& (1 << (int) RID_SIGNED
))
4136 || (typedef_decl
&& C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl
)))
4137 C_TYPEDEF_EXPLICITLY_SIGNED (decl
) = 1;
4138 decl_attributes (&decl
, returned_attrs
, 0);
4142 /* Detect the case of an array type of unspecified size
4143 which came, as such, direct from a typedef name.
4144 We must copy the type, so that each identifier gets
4145 a distinct type, so that each identifier's size can be
4146 controlled separately by its own initializer. */
4148 if (type
!= 0 && typedef_type
!= 0
4149 && TREE_CODE (type
) == ARRAY_TYPE
&& TYPE_DOMAIN (type
) == 0
4150 && TYPE_MAIN_VARIANT (type
) == TYPE_MAIN_VARIANT (typedef_type
))
4152 type
= build_array_type (TREE_TYPE (type
), 0);
4154 C_TYPE_VARIABLE_SIZE (type
) = 1;
4157 /* If this is a type name (such as, in a cast or sizeof),
4158 compute the type and return it now. */
4160 if (decl_context
== TYPENAME
)
4162 /* Note that the grammar rejects storage classes
4163 in typenames, fields or parameters */
4164 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
4166 pedwarn ("ISO C forbids const or volatile function types");
4168 type
= c_build_qualified_type (type
, type_quals
);
4169 decl_attributes (&type
, returned_attrs
, 0);
4173 /* Aside from typedefs and type names (handle above),
4174 `void' at top level (not within pointer)
4175 is allowed only in public variables.
4176 We don't complain about parms either, but that is because
4177 a better error message can be made later. */
4179 if (VOID_TYPE_P (type
) && decl_context
!= PARM
4180 && ! ((decl_context
!= FIELD
&& TREE_CODE (type
) != FUNCTION_TYPE
)
4181 && ((specbits
& (1 << (int) RID_EXTERN
))
4182 || (current_scope
== global_scope
4184 & ((1 << (int) RID_STATIC
) | (1 << (int) RID_REGISTER
)))))))
4186 error ("variable or field `%s' declared void", name
);
4187 type
= integer_type_node
;
4190 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4191 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4196 if (decl_context
== PARM
)
4198 tree type_as_written
;
4201 /* A parameter declared as an array of T is really a pointer to T.
4202 One declared as a function is really a pointer to a function. */
4204 if (TREE_CODE (type
) == ARRAY_TYPE
)
4206 /* Transfer const-ness of array into that of type pointed to. */
4207 type
= TREE_TYPE (type
);
4209 type
= c_build_qualified_type (type
, type_quals
);
4210 type
= build_pointer_type (type
);
4211 type_quals
= TYPE_UNQUALIFIED
;
4212 if (array_ptr_quals
)
4214 tree new_ptr_quals
, new_ptr_attrs
;
4216 split_specs_attrs (array_ptr_quals
, &new_ptr_quals
, &new_ptr_attrs
);
4217 /* We don't yet implement attributes in this context. */
4218 if (new_ptr_attrs
!= NULL_TREE
)
4219 warning ("attributes in parameter array declarator ignored");
4224 for (; new_ptr_quals
; new_ptr_quals
= TREE_CHAIN (new_ptr_quals
))
4226 tree qualifier
= TREE_VALUE (new_ptr_quals
);
4228 if (C_IS_RESERVED_WORD (qualifier
))
4230 if (C_RID_CODE (qualifier
) == RID_CONST
)
4232 else if (C_RID_CODE (qualifier
) == RID_VOLATILE
)
4234 else if (C_RID_CODE (qualifier
) == RID_RESTRICT
)
4244 error ("invalid type modifier within array declarator");
4246 type_quals
= ((constp
? TYPE_QUAL_CONST
: 0)
4247 | (restrictp
? TYPE_QUAL_RESTRICT
: 0)
4248 | (volatilep
? TYPE_QUAL_VOLATILE
: 0));
4252 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
4254 if (pedantic
&& type_quals
)
4255 pedwarn ("ISO C forbids qualified function types");
4257 type
= c_build_qualified_type (type
, type_quals
);
4258 type
= build_pointer_type (type
);
4259 type_quals
= TYPE_UNQUALIFIED
;
4261 else if (type_quals
)
4262 type
= c_build_qualified_type (type
, type_quals
);
4264 type_as_written
= type
;
4266 decl
= build_decl (PARM_DECL
, declarator
, type
);
4268 C_DECL_VARIABLE_SIZE (decl
) = 1;
4270 /* Compute the type actually passed in the parmlist,
4271 for the case where there is no prototype.
4272 (For example, shorts and chars are passed as ints.)
4273 When there is a prototype, this is overridden later. */
4275 if (type
== error_mark_node
)
4276 promoted_type
= type
;
4278 promoted_type
= c_type_promotes_to (type
);
4280 DECL_ARG_TYPE (decl
) = promoted_type
;
4281 DECL_ARG_TYPE_AS_WRITTEN (decl
) = type_as_written
;
4283 else if (decl_context
== FIELD
)
4285 /* Structure field. It may not be a function. */
4287 if (TREE_CODE (type
) == FUNCTION_TYPE
)
4289 error ("field `%s' declared as a function", name
);
4290 type
= build_pointer_type (type
);
4292 else if (TREE_CODE (type
) != ERROR_MARK
4293 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type
))
4295 error ("field `%s' has incomplete type", name
);
4296 type
= error_mark_node
;
4298 /* Move type qualifiers down to element of an array. */
4299 if (TREE_CODE (type
) == ARRAY_TYPE
&& type_quals
)
4300 type
= build_array_type (c_build_qualified_type (TREE_TYPE (type
),
4302 TYPE_DOMAIN (type
));
4303 decl
= build_decl (FIELD_DECL
, declarator
, type
);
4304 DECL_NONADDRESSABLE_P (decl
) = bitfield
;
4307 C_DECL_VARIABLE_SIZE (decl
) = 1;
4309 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
4311 /* Every function declaration is "external"
4312 except for those which are inside a function body
4313 in which `auto' is used.
4314 That is a case not specified by ANSI C,
4315 and we use it for forward declarations for nested functions. */
4316 int extern_ref
= (!(specbits
& (1 << (int) RID_AUTO
))
4317 || current_scope
== global_scope
);
4319 if (specbits
& (1 << (int) RID_AUTO
)
4320 && (pedantic
|| current_scope
== global_scope
))
4321 pedwarn ("invalid storage class for function `%s'", name
);
4322 if (specbits
& (1 << (int) RID_REGISTER
))
4323 error ("invalid storage class for function `%s'", name
);
4324 if (specbits
& (1 << (int) RID_THREAD
))
4325 error ("invalid storage class for function `%s'", name
);
4326 /* Function declaration not at file scope.
4327 Storage classes other than `extern' are not allowed
4328 and `extern' makes no difference. */
4329 if (current_scope
!= global_scope
4330 && (specbits
& ((1 << (int) RID_STATIC
) | (1 << (int) RID_INLINE
)))
4332 pedwarn ("invalid storage class for function `%s'", name
);
4334 decl
= build_decl (FUNCTION_DECL
, declarator
, type
);
4335 decl
= build_decl_attribute_variant (decl
, decl_attr
);
4337 DECL_LANG_SPECIFIC (decl
)
4338 = ggc_alloc_cleared (sizeof (struct lang_decl
));
4340 if (pedantic
&& type_quals
&& ! DECL_IN_SYSTEM_HEADER (decl
))
4341 pedwarn ("ISO C forbids qualified function types");
4343 /* GNU C interprets a `volatile void' return type to indicate
4344 that the function does not return. */
4345 if ((type_quals
& TYPE_QUAL_VOLATILE
)
4346 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl
))))
4347 warning ("`noreturn' function returns non-void value");
4350 DECL_EXTERNAL (decl
) = 1;
4351 /* Record absence of global scope for `static' or `auto'. */
4353 = !(specbits
& ((1 << (int) RID_STATIC
) | (1 << (int) RID_AUTO
)));
4356 C_FUNCTION_IMPLICIT_INT (decl
) = 1;
4358 /* Record presence of `inline', if it is reasonable. */
4359 if (MAIN_NAME_P (declarator
))
4362 warning ("cannot inline function `main'");
4366 /* Record that the function is declared `inline'. */
4367 DECL_DECLARED_INLINE_P (decl
) = 1;
4369 /* Do not mark bare declarations as DECL_INLINE. Doing so
4370 in the presence of multiple declarations can result in
4371 the abstract origin pointing between the declarations,
4372 which will confuse dwarf2out. */
4375 DECL_INLINE (decl
) = 1;
4376 if (specbits
& (1 << (int) RID_EXTERN
))
4377 current_extern_inline
= 1;
4380 /* If -finline-functions, assume it can be inlined. This does
4381 two things: let the function be deferred until it is actually
4382 needed, and let dwarf2 know that the function is inlinable. */
4383 else if (flag_inline_trees
== 2 && initialized
)
4384 DECL_INLINE (decl
) = 1;
4388 /* It's a variable. */
4389 /* An uninitialized decl with `extern' is a reference. */
4390 int extern_ref
= !initialized
&& (specbits
& (1 << (int) RID_EXTERN
));
4392 /* Move type qualifiers down to element of an array. */
4393 if (TREE_CODE (type
) == ARRAY_TYPE
&& type_quals
)
4395 int saved_align
= TYPE_ALIGN(type
);
4396 type
= build_array_type (c_build_qualified_type (TREE_TYPE (type
),
4398 TYPE_DOMAIN (type
));
4399 TYPE_ALIGN (type
) = saved_align
;
4401 else if (type_quals
)
4402 type
= c_build_qualified_type (type
, type_quals
);
4404 /* It is invalid to create an `extern' declaration for a
4405 variable if there is a global declaration that is
4407 if (extern_ref
&& current_scope
!= global_scope
)
4411 global_decl
= identifier_global_value (declarator
);
4413 && TREE_CODE (global_decl
) == VAR_DECL
4414 && !TREE_PUBLIC (global_decl
))
4415 error ("variable previously declared `static' redeclared "
4419 decl
= build_decl (VAR_DECL
, declarator
, type
);
4421 C_DECL_VARIABLE_SIZE (decl
) = 1;
4424 pedwarn ("%Jvariable '%D' declared `inline'", decl
, decl
);
4426 DECL_EXTERNAL (decl
) = extern_ref
;
4428 /* At file scope, the presence of a `static' or `register' storage
4429 class specifier, or the absence of all storage class specifiers
4430 makes this declaration a definition (perhaps tentative). Also,
4431 the absence of both `static' and `register' makes it public. */
4432 if (current_scope
== global_scope
)
4434 TREE_PUBLIC (decl
) = !(specbits
& ((1 << (int) RID_STATIC
)
4435 | (1 << (int) RID_REGISTER
)));
4436 TREE_STATIC (decl
) = !extern_ref
;
4438 /* Not at file scope, only `static' makes a static definition. */
4441 TREE_STATIC (decl
) = (specbits
& (1 << (int) RID_STATIC
)) != 0;
4442 TREE_PUBLIC (decl
) = extern_ref
;
4445 if (specbits
& 1 << (int) RID_THREAD
)
4447 if (targetm
.have_tls
)
4448 DECL_THREAD_LOCAL (decl
) = 1;
4450 /* A mere warning is sure to result in improper semantics
4451 at runtime. Don't bother to allow this to compile. */
4452 error ("thread-local storage not supported for this target");
4456 /* Record `register' declaration for warnings on &
4457 and in case doing stupid register allocation. */
4459 if (specbits
& (1 << (int) RID_REGISTER
))
4460 DECL_REGISTER (decl
) = 1;
4462 /* Record constancy and volatility. */
4463 c_apply_type_quals_to_decl (type_quals
, decl
);
4465 /* If a type has volatile components, it should be stored in memory.
4466 Otherwise, the fact that those components are volatile
4467 will be ignored, and would even crash the compiler. */
4468 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl
)))
4469 c_mark_addressable (decl
);
4471 #ifdef ENABLE_CHECKING
4472 /* This is the earliest point at which we might know the assembler
4473 name of a variable. Thus, if it's known before this, die horribly. */
4474 if (DECL_ASSEMBLER_NAME_SET_P (decl
))
4478 decl_attributes (&decl
, returned_attrs
, 0);
4484 /* Decode the parameter-list info for a function type or function definition.
4485 The argument is the value returned by `get_parm_info' (or made in parse.y
4486 if there is an identifier list instead of a parameter decl list).
4487 These two functions are separate because when a function returns
4488 or receives functions then each is called multiple times but the order
4489 of calls is different. The last call to `grokparms' is always the one
4490 that contains the formal parameter names of a function definition.
4492 Store in `last_function_parms' a chain of the decls of parms.
4493 Also store in `last_function_parm_tags' a chain of the struct, union,
4494 and enum tags declared among the parms.
4496 Return a list of arg types to use in the FUNCTION_TYPE for this function.
4498 FUNCDEF_FLAG is nonzero for a function definition, 0 for
4499 a mere declaration. A nonempty identifier-list gets an error message
4500 when FUNCDEF_FLAG is zero. */
4503 grokparms (tree parms_info
, int funcdef_flag
)
4505 tree first_parm
= TREE_CHAIN (parms_info
);
4507 last_function_parms
= TREE_PURPOSE (parms_info
);
4508 last_function_parm_tags
= TREE_VALUE (parms_info
);
4509 last_function_parm_others
= TREE_TYPE (parms_info
);
4511 if (warn_strict_prototypes
&& first_parm
== 0 && !funcdef_flag
4512 && !in_system_header
)
4513 warning ("function declaration isn't a prototype");
4516 && TREE_CODE (TREE_VALUE (first_parm
)) == IDENTIFIER_NODE
)
4519 pedwarn ("parameter names (without types) in function declaration");
4521 last_function_parms
= first_parm
;
4528 /* If the arg types are incomplete in a declaration,
4529 they must include undefined tags.
4530 These tags can never be defined in the scope of the declaration,
4531 so the types can never be completed,
4532 and no call can be compiled successfully. */
4534 for (parm
= last_function_parms
, typelt
= first_parm
;
4536 parm
= TREE_CHAIN (parm
))
4537 /* Skip over any enumeration constants declared here. */
4538 if (TREE_CODE (parm
) == PARM_DECL
)
4540 /* Barf if the parameter itself has an incomplete type. */
4541 tree type
= TREE_VALUE (typelt
);
4542 if (type
== error_mark_node
)
4544 if (!COMPLETE_TYPE_P (type
))
4546 if (funcdef_flag
&& DECL_NAME (parm
) != 0)
4547 error ("parameter `%s' has incomplete type",
4548 IDENTIFIER_POINTER (DECL_NAME (parm
)));
4550 warning ("parameter has incomplete type");
4553 TREE_VALUE (typelt
) = error_mark_node
;
4554 TREE_TYPE (parm
) = error_mark_node
;
4557 typelt
= TREE_CHAIN (typelt
);
4564 /* Return a tree_list node with info on a parameter list just parsed.
4565 The TREE_PURPOSE is a list of decls of those parms.
4566 The TREE_VALUE is a list of structure, union and enum tags defined.
4567 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
4568 The TREE_TYPE is a list of non-parameter decls which appeared with the
4570 This tree_list node is later fed to `grokparms'.
4572 VOID_AT_END nonzero means append `void' to the end of the type-list.
4573 Zero means the parmlist ended with an ellipsis so don't append `void'. */
4576 get_parm_info (int void_at_end
)
4578 tree decl
, type
, list
;
4580 tree
*last_type
= &types
;
4581 tree tags
= current_scope
->tags
;
4582 tree parms
= current_scope
->parms
;
4583 tree others
= current_scope
->names
;
4584 static bool explained_incomplete_types
= false;
4585 bool gave_void_only_once_err
= false;
4587 /* Just "void" (and no ellipsis) is special. There are really no parms.
4588 But if the "void" is qualified (by "const" or "volatile"), or has a
4589 storage class specifier ("register"), then the behavior is undefined;
4590 issue an error. Typedefs for "void" are OK (see DR#157). */
4591 if (void_at_end
&& parms
!= 0
4592 && TREE_CHAIN (parms
) == 0
4593 && VOID_TYPE_P (TREE_TYPE (parms
))
4594 && !DECL_NAME (parms
))
4596 if (TREE_THIS_VOLATILE (parms
)
4597 || TREE_READONLY (parms
)
4598 || DECL_REGISTER (parms
))
4599 error ("\"void\" as only parameter may not be qualified");
4601 return tree_cons (0, 0, tree_cons (0, void_type_node
, 0));
4604 /* Sanity check all of the parameter declarations. */
4605 for (decl
= parms
; decl
; decl
= TREE_CHAIN (decl
))
4607 if (TREE_CODE (decl
) != PARM_DECL
)
4609 if (TREE_ASM_WRITTEN (decl
))
4612 /* Since there is a prototype, args are passed in their
4613 declared types. The back end may override this. */
4614 type
= TREE_TYPE (decl
);
4615 DECL_ARG_TYPE (decl
) = type
;
4617 /* Check for (..., void, ...) and issue an error. */
4618 if (VOID_TYPE_P (type
) && !DECL_NAME (decl
) && !gave_void_only_once_err
)
4620 error ("\"void\" must be the only parameter");
4621 gave_void_only_once_err
= true;
4624 type
= build_tree_list (0, type
);
4626 last_type
= &TREE_CHAIN (type
);
4629 /* Check the list of non-parameter decls for any forward parm decls
4630 that never got real decls. */
4631 for (decl
= others
; decl
; decl
= TREE_CHAIN (decl
))
4632 if (TREE_CODE (decl
) == PARM_DECL
)
4634 if (!TREE_ASM_WRITTEN (decl
))
4637 error ("%Jparameter \"%D\" has just a forward declaration",
4641 /* Warn about any struct, union or enum tags defined within this
4642 list. The scope of such types is limited to this declaration,
4643 which is rarely if ever desirable (it's impossible to call such
4644 a function with type-correct arguments). */
4645 for (decl
= tags
; decl
; decl
= TREE_CHAIN (decl
))
4647 enum tree_code code
= TREE_CODE (TREE_VALUE (decl
));
4648 const char *keyword
;
4649 /* An anonymous union parm type is meaningful as a GNU extension.
4650 So don't warn for that. */
4651 if (code
== UNION_TYPE
&& TREE_PURPOSE (decl
) == 0 && !pedantic
)
4654 /* The keyword should not be translated. */
4657 case RECORD_TYPE
: keyword
= "struct"; break;
4658 case UNION_TYPE
: keyword
= "union"; break;
4659 case ENUMERAL_TYPE
: keyword
= "enum"; break;
4663 if (TREE_PURPOSE (decl
))
4664 /* The first %s will be one of 'struct', 'union', or 'enum'. */
4665 warning ("\"%s %s\" declared inside parameter list",
4666 keyword
, IDENTIFIER_POINTER (TREE_PURPOSE (decl
)));
4668 /* The %s will be one of 'struct', 'union', or 'enum'. */
4669 warning ("anonymous %s declared inside parameter list", keyword
);
4671 if (! explained_incomplete_types
)
4673 warning ("its scope is only this definition or declaration,"
4674 " which is probably not what you want");
4675 explained_incomplete_types
= true;
4682 type
= build_tree_list (0, void_type_node
);
4686 list
= tree_cons (parms
, tags
, types
);
4687 TREE_TYPE (list
) = others
;
4691 /* Get the struct, enum or union (CODE says which) with tag NAME.
4692 Define the tag as a forward-reference if it is not defined. */
4695 xref_tag (enum tree_code code
, tree name
)
4697 /* If a cross reference is requested, look up the type
4698 already defined for this tag and return it. */
4700 tree ref
= lookup_tag (code
, name
, 0);
4701 /* If this is the right type of tag, return what we found.
4702 (This reference will be shadowed by shadow_tag later if appropriate.)
4703 If this is the wrong type of tag, do not return it. If it was the
4704 wrong type in the same scope, we will have had an error
4705 message already; if in a different scope and declaring
4706 a name, pending_xref_error will give an error message; but if in a
4707 different scope and not declaring a name, this tag should
4708 shadow the previous declaration of a different type of tag, and
4709 this would not work properly if we return the reference found.
4710 (For example, with "struct foo" in an outer scope, "union foo;"
4711 must shadow that tag with a new one of union type.) */
4712 if (ref
&& TREE_CODE (ref
) == code
)
4715 /* If no such tag is yet defined, create a forward-reference node
4716 and record it as the "definition".
4717 When a real declaration of this type is found,
4718 the forward-reference will be altered into a real type. */
4720 ref
= make_node (code
);
4721 if (code
== ENUMERAL_TYPE
)
4723 /* Give the type a default layout like unsigned int
4724 to avoid crashing if it does not get defined. */
4725 TYPE_MODE (ref
) = TYPE_MODE (unsigned_type_node
);
4726 TYPE_ALIGN (ref
) = TYPE_ALIGN (unsigned_type_node
);
4727 TYPE_USER_ALIGN (ref
) = 0;
4728 TREE_UNSIGNED (ref
) = 1;
4729 TYPE_PRECISION (ref
) = TYPE_PRECISION (unsigned_type_node
);
4730 TYPE_MIN_VALUE (ref
) = TYPE_MIN_VALUE (unsigned_type_node
);
4731 TYPE_MAX_VALUE (ref
) = TYPE_MAX_VALUE (unsigned_type_node
);
4734 pushtag (name
, ref
);
4739 /* Make sure that the tag NAME is defined *in the current scope*
4740 at least as a forward reference.
4741 CODE says which kind of tag NAME ought to be. */
4744 start_struct (enum tree_code code
, tree name
)
4746 /* If there is already a tag defined at this scope
4747 (as a forward reference), just return it. */
4752 ref
= lookup_tag (code
, name
, 1);
4753 if (ref
&& TREE_CODE (ref
) == code
)
4755 if (TYPE_FIELDS (ref
))
4757 if (code
== UNION_TYPE
)
4758 error ("redefinition of `union %s'", IDENTIFIER_POINTER (name
));
4760 error ("redefinition of `struct %s'", IDENTIFIER_POINTER (name
));
4765 /* Otherwise create a forward-reference just so the tag is in scope. */
4767 ref
= make_node (code
);
4768 pushtag (name
, ref
);
4771 C_TYPE_BEING_DEFINED (ref
) = 1;
4772 TYPE_PACKED (ref
) = flag_pack_struct
;
4776 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
4777 of a structure component, returning a FIELD_DECL node.
4778 WIDTH is non-NULL for bit-fields only, and is an INTEGER_CST node.
4780 This is done during the parsing of the struct declaration.
4781 The FIELD_DECL nodes are chained together and the lot of them
4782 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
4785 grokfield (tree declarator
, tree declspecs
, tree width
)
4789 if (declarator
== NULL_TREE
&& width
== NULL_TREE
)
4791 /* This is an unnamed decl.
4793 If we have something of the form "union { list } ;" then this
4794 is the anonymous union extension. Similarly for struct.
4796 If this is something of the form "struct foo;", then
4797 If MS extensions are enabled, this is handled as an
4799 Otherwise this is a forward declaration of a structure tag.
4801 If this is something of the form "foo;" and foo is a TYPE_DECL, then
4802 If MS extensions are enabled and foo names a structure, then
4803 again this is an anonymous struct.
4804 Otherwise this is an error.
4806 Oh what a horrid tangled web we weave. I wonder if MS consciously
4807 took this from Plan 9 or if it was an accident of implementation
4808 that took root before someone noticed the bug... */
4810 tree type
= TREE_VALUE (declspecs
);
4812 if (flag_ms_extensions
&& TREE_CODE (type
) == TYPE_DECL
)
4813 type
= TREE_TYPE (type
);
4814 if (TREE_CODE (type
) == RECORD_TYPE
|| TREE_CODE (type
) == UNION_TYPE
)
4816 if (flag_ms_extensions
)
4819 goto warn_unnamed_field
;
4820 else if (TYPE_NAME (type
) == NULL
)
4823 goto warn_unnamed_field
;
4828 warning ("declaration does not declare anything");
4833 value
= grokdeclarator (declarator
, declspecs
, FIELD
, 0,
4834 width
? &width
: NULL
);
4836 finish_decl (value
, NULL_TREE
, NULL_TREE
);
4837 DECL_INITIAL (value
) = width
;
4842 /* Generate an error for any duplicate field names in FIELDLIST. Munge
4843 the list such that this does not present a problem later. */
4846 detect_field_duplicates (tree fieldlist
)
4851 /* First, see if there are more than "a few" fields.
4852 This is trivially true if there are zero or one fields. */
4855 x
= TREE_CHAIN (fieldlist
);
4861 } while (timeout
> 0 && x
);
4863 /* If there were "few" fields, avoid the overhead of allocating
4864 a hash table. Instead just do the nested traversal thing. */
4867 for (x
= TREE_CHAIN (fieldlist
); x
; x
= TREE_CHAIN (x
))
4870 for (y
= fieldlist
; y
!= x
; y
= TREE_CHAIN (y
))
4871 if (DECL_NAME (y
) == DECL_NAME (x
))
4873 error ("%Jduplicate member '%D'", x
, x
);
4874 DECL_NAME (x
) = NULL_TREE
;
4880 htab_t htab
= htab_create (37, htab_hash_pointer
, htab_eq_pointer
, NULL
);
4883 for (x
= fieldlist
; x
; x
= TREE_CHAIN (x
))
4884 if ((y
= DECL_NAME (x
)) != 0)
4886 slot
= htab_find_slot (htab
, y
, INSERT
);
4889 error ("%Jduplicate member '%D'", x
, x
);
4890 DECL_NAME (x
) = NULL_TREE
;
4899 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
4900 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
4901 ATTRIBUTES are attributes to be applied to the structure. */
4904 finish_struct (tree t
, tree fieldlist
, tree attributes
)
4907 int toplevel
= global_scope
== current_scope
;
4908 int saw_named_field
;
4910 /* If this type was previously laid out as a forward reference,
4911 make sure we lay it out again. */
4915 decl_attributes (&t
, attributes
, (int) ATTR_FLAG_TYPE_IN_PLACE
);
4917 /* Nameless union parm types are useful as GCC extension. */
4918 if (! (TREE_CODE (t
) == UNION_TYPE
&& TYPE_NAME (t
) == 0) && !pedantic
)
4919 /* Otherwise, warn about any struct or union def. in parmlist. */
4920 if (in_parm_level_p ())
4923 pedwarn ("%s defined inside parms",
4924 TREE_CODE (t
) == UNION_TYPE
? _("union") : _("structure"));
4926 warning ("%s defined inside parms",
4927 TREE_CODE (t
) == UNION_TYPE
? _("union") : _("structure"));
4932 for (x
= fieldlist
; x
; x
= TREE_CHAIN (x
))
4933 if (DECL_NAME (x
) != 0)
4937 pedwarn ("%s has no %s",
4938 TREE_CODE (t
) == UNION_TYPE
? _("union") : _("struct"),
4939 fieldlist
? _("named members") : _("members"));
4942 /* Install struct as DECL_CONTEXT of each field decl.
4943 Also process specified field sizes,m which is found in the DECL_INITIAL.
4944 Store 0 there, except for ": 0" fields (so we can find them
4945 and delete them, below). */
4947 saw_named_field
= 0;
4948 for (x
= fieldlist
; x
; x
= TREE_CHAIN (x
))
4950 DECL_CONTEXT (x
) = t
;
4951 DECL_PACKED (x
) |= TYPE_PACKED (t
);
4953 /* If any field is const, the structure type is pseudo-const. */
4954 if (TREE_READONLY (x
))
4955 C_TYPE_FIELDS_READONLY (t
) = 1;
4958 /* A field that is pseudo-const makes the structure likewise. */
4959 tree t1
= TREE_TYPE (x
);
4960 while (TREE_CODE (t1
) == ARRAY_TYPE
)
4961 t1
= TREE_TYPE (t1
);
4962 if ((TREE_CODE (t1
) == RECORD_TYPE
|| TREE_CODE (t1
) == UNION_TYPE
)
4963 && C_TYPE_FIELDS_READONLY (t1
))
4964 C_TYPE_FIELDS_READONLY (t
) = 1;
4967 /* Any field that is volatile means variables of this type must be
4968 treated in some ways as volatile. */
4969 if (TREE_THIS_VOLATILE (x
))
4970 C_TYPE_FIELDS_VOLATILE (t
) = 1;
4972 /* Any field of nominal variable size implies structure is too. */
4973 if (C_DECL_VARIABLE_SIZE (x
))
4974 C_TYPE_VARIABLE_SIZE (t
) = 1;
4976 /* Detect invalid nested redefinition. */
4977 if (TREE_TYPE (x
) == t
)
4978 error ("nested redefinition of `%s'",
4979 IDENTIFIER_POINTER (TYPE_NAME (t
)));
4981 if (DECL_INITIAL (x
))
4983 unsigned HOST_WIDE_INT width
= tree_low_cst (DECL_INITIAL (x
), 1);
4984 DECL_SIZE (x
) = bitsize_int (width
);
4985 DECL_BIT_FIELD (x
) = 1;
4986 SET_DECL_C_BIT_FIELD (x
);
4989 DECL_INITIAL (x
) = 0;
4991 /* Detect flexible array member in an invalid context. */
4992 if (TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
4993 && TYPE_SIZE (TREE_TYPE (x
)) == NULL_TREE
4994 && TYPE_DOMAIN (TREE_TYPE (x
)) != NULL_TREE
4995 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x
))) == NULL_TREE
)
4997 if (TREE_CODE (t
) == UNION_TYPE
)
4998 error ("%Jflexible array member in union", x
);
4999 else if (TREE_CHAIN (x
) != NULL_TREE
)
5000 error ("%Jflexible array member not at end of struct", x
);
5001 else if (! saw_named_field
)
5002 error ("%Jflexible array member in otherwise empty struct", x
);
5005 if (pedantic
&& TREE_CODE (t
) == RECORD_TYPE
5006 && flexible_array_type_p (TREE_TYPE (x
)))
5007 pedwarn ("%Jinvalid use of structure with flexible array member", x
);
5010 saw_named_field
= 1;
5013 detect_field_duplicates (fieldlist
);
5015 /* Now we have the nearly final fieldlist. Record it,
5016 then lay out the structure or union (including the fields). */
5018 TYPE_FIELDS (t
) = fieldlist
;
5022 /* Delete all zero-width bit-fields from the fieldlist. */
5024 tree
*fieldlistp
= &fieldlist
;
5026 if (TREE_CODE (*fieldlistp
) == FIELD_DECL
&& DECL_INITIAL (*fieldlistp
))
5027 *fieldlistp
= TREE_CHAIN (*fieldlistp
);
5029 fieldlistp
= &TREE_CHAIN (*fieldlistp
);
5032 /* Now we have the truly final field list.
5033 Store it in this type and in the variants. */
5035 TYPE_FIELDS (t
) = fieldlist
;
5037 /* If there are lots of fields, sort so we can look through them fast.
5038 We arbitrarily consider 16 or more elts to be "a lot". */
5043 for (x
= fieldlist
; x
; x
= TREE_CHAIN (x
))
5045 if (len
> 15 || DECL_NAME (x
) == NULL
)
5053 struct lang_type
*space
;
5054 struct sorted_fields_type
*space2
;
5056 len
+= list_length (x
);
5058 /* Use the same allocation policy here that make_node uses, to
5059 ensure that this lives as long as the rest of the struct decl.
5060 All decls in an inline function need to be saved. */
5062 space
= ggc_alloc (sizeof (struct lang_type
));
5063 space2
= ggc_alloc (sizeof (struct sorted_fields_type
) + len
* sizeof (tree
));
5067 field_array
= &space2
->elts
[0];
5068 for (x
= fieldlist
; x
; x
= TREE_CHAIN (x
))
5070 field_array
[len
++] = x
;
5072 /* If there is anonymous struct or union, break out of the loop. */
5073 if (DECL_NAME (x
) == NULL
)
5076 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
5079 TYPE_LANG_SPECIFIC (t
) = space
;
5080 TYPE_LANG_SPECIFIC (t
)->s
->len
= len
;
5081 field_array
= TYPE_LANG_SPECIFIC (t
)->s
->elts
;
5082 qsort (field_array
, len
, sizeof (tree
), field_decl_cmp
);
5087 for (x
= TYPE_MAIN_VARIANT (t
); x
; x
= TYPE_NEXT_VARIANT (x
))
5089 TYPE_FIELDS (x
) = TYPE_FIELDS (t
);
5090 TYPE_LANG_SPECIFIC (x
) = TYPE_LANG_SPECIFIC (t
);
5091 TYPE_ALIGN (x
) = TYPE_ALIGN (t
);
5092 TYPE_USER_ALIGN (x
) = TYPE_USER_ALIGN (t
);
5095 /* If this was supposed to be a transparent union, but we can't
5096 make it one, warn and turn off the flag. */
5097 if (TREE_CODE (t
) == UNION_TYPE
5098 && TYPE_TRANSPARENT_UNION (t
)
5099 && TYPE_MODE (t
) != DECL_MODE (TYPE_FIELDS (t
)))
5101 TYPE_TRANSPARENT_UNION (t
) = 0;
5102 warning ("union cannot be made transparent");
5105 /* If this structure or union completes the type of any previous
5106 variable declaration, lay it out and output its rtl. */
5107 for (x
= C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t
));
5111 tree decl
= TREE_VALUE (x
);
5112 if (TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
)
5113 layout_array_type (TREE_TYPE (decl
));
5114 if (TREE_CODE (decl
) != TYPE_DECL
)
5116 layout_decl (decl
, 0);
5117 if (c_dialect_objc ())
5118 objc_check_decl (decl
);
5119 rest_of_decl_compilation (decl
, NULL
, toplevel
, 0);
5124 C_TYPE_INCOMPLETE_VARS (TYPE_MAIN_VARIANT (t
)) = 0;
5126 /* Finish debugging output for this type. */
5127 rest_of_type_compilation (t
, toplevel
);
5132 /* Lay out the type T, and its element type, and so on. */
5135 layout_array_type (tree t
)
5137 if (TREE_CODE (TREE_TYPE (t
)) == ARRAY_TYPE
)
5138 layout_array_type (TREE_TYPE (t
));
5142 /* Begin compiling the definition of an enumeration type.
5143 NAME is its name (or null if anonymous).
5144 Returns the type object, as yet incomplete.
5145 Also records info about it so that build_enumerator
5146 may be used to declare the individual values as they are read. */
5149 start_enum (tree name
)
5153 /* If this is the real definition for a previous forward reference,
5154 fill in the contents in the same object that used to be the
5155 forward reference. */
5158 enumtype
= lookup_tag (ENUMERAL_TYPE
, name
, 1);
5160 if (enumtype
== 0 || TREE_CODE (enumtype
) != ENUMERAL_TYPE
)
5162 enumtype
= make_node (ENUMERAL_TYPE
);
5163 pushtag (name
, enumtype
);
5166 C_TYPE_BEING_DEFINED (enumtype
) = 1;
5168 if (TYPE_VALUES (enumtype
) != 0)
5170 /* This enum is a named one that has been declared already. */
5171 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name
));
5173 /* Completely replace its old definition.
5174 The old enumerators remain defined, however. */
5175 TYPE_VALUES (enumtype
) = 0;
5178 enum_next_value
= integer_zero_node
;
5181 if (flag_short_enums
)
5182 TYPE_PACKED (enumtype
) = 1;
5187 /* After processing and defining all the values of an enumeration type,
5188 install their decls in the enumeration type and finish it off.
5189 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5190 and ATTRIBUTES are the specified attributes.
5191 Returns ENUMTYPE. */
5194 finish_enum (tree enumtype
, tree values
, tree attributes
)
5197 tree minnode
= 0, maxnode
= 0, enum_value_type
;
5198 int precision
, unsign
;
5199 int toplevel
= (global_scope
== current_scope
);
5201 if (in_parm_level_p ())
5202 warning ("enum defined inside parms");
5204 decl_attributes (&enumtype
, attributes
, (int) ATTR_FLAG_TYPE_IN_PLACE
);
5206 /* Calculate the maximum value of any enumerator in this type. */
5208 if (values
== error_mark_node
)
5209 minnode
= maxnode
= integer_zero_node
;
5212 minnode
= maxnode
= TREE_VALUE (values
);
5213 for (pair
= TREE_CHAIN (values
); pair
; pair
= TREE_CHAIN (pair
))
5215 tree value
= TREE_VALUE (pair
);
5216 if (tree_int_cst_lt (maxnode
, value
))
5218 if (tree_int_cst_lt (value
, minnode
))
5223 /* Construct the final type of this enumeration. It is the same
5224 as one of the integral types - the narrowest one that fits, except
5225 that normally we only go as narrow as int - and signed iff any of
5226 the values are negative. */
5227 unsign
= (tree_int_cst_sgn (minnode
) >= 0);
5228 precision
= MAX (min_precision (minnode
, unsign
),
5229 min_precision (maxnode
, unsign
));
5230 if (TYPE_PACKED (enumtype
) || precision
> TYPE_PRECISION (integer_type_node
))
5232 tree narrowest
= c_common_type_for_size (precision
, unsign
);
5235 warning ("enumeration values exceed range of largest integer");
5236 narrowest
= long_long_integer_type_node
;
5239 precision
= TYPE_PRECISION (narrowest
);
5242 precision
= TYPE_PRECISION (integer_type_node
);
5244 if (precision
== TYPE_PRECISION (integer_type_node
))
5245 enum_value_type
= c_common_type_for_size (precision
, 0);
5247 enum_value_type
= enumtype
;
5249 TYPE_MIN_VALUE (enumtype
) = minnode
;
5250 TYPE_MAX_VALUE (enumtype
) = maxnode
;
5251 TYPE_PRECISION (enumtype
) = precision
;
5252 TREE_UNSIGNED (enumtype
) = unsign
;
5253 TYPE_SIZE (enumtype
) = 0;
5254 layout_type (enumtype
);
5256 if (values
!= error_mark_node
)
5258 /* Change the type of the enumerators to be the enum type. We
5259 need to do this irrespective of the size of the enum, for
5260 proper type checking. Replace the DECL_INITIALs of the
5261 enumerators, and the value slots of the list, with copies
5262 that have the enum type; they cannot be modified in place
5263 because they may be shared (e.g. integer_zero_node) Finally,
5264 change the purpose slots to point to the names of the decls. */
5265 for (pair
= values
; pair
; pair
= TREE_CHAIN (pair
))
5267 tree enu
= TREE_PURPOSE (pair
);
5269 TREE_TYPE (enu
) = enumtype
;
5271 /* The ISO C Standard mandates enumerators to have type int,
5272 even though the underlying type of an enum type is
5273 unspecified. Here we convert any enumerators that fit in
5274 an int to type int, to avoid promotions to unsigned types
5275 when comparing integers with enumerators that fit in the
5276 int range. When -pedantic is given, build_enumerator()
5277 would have already taken care of those that don't fit. */
5278 if (int_fits_type_p (DECL_INITIAL (enu
), enum_value_type
))
5279 DECL_INITIAL (enu
) = convert (enum_value_type
, DECL_INITIAL (enu
));
5281 DECL_INITIAL (enu
) = convert (enumtype
, DECL_INITIAL (enu
));
5283 TREE_PURPOSE (pair
) = DECL_NAME (enu
);
5284 TREE_VALUE (pair
) = DECL_INITIAL (enu
);
5287 TYPE_VALUES (enumtype
) = values
;
5290 /* Fix up all variant types of this enum type. */
5291 for (tem
= TYPE_MAIN_VARIANT (enumtype
); tem
; tem
= TYPE_NEXT_VARIANT (tem
))
5293 if (tem
== enumtype
)
5295 TYPE_VALUES (tem
) = TYPE_VALUES (enumtype
);
5296 TYPE_MIN_VALUE (tem
) = TYPE_MIN_VALUE (enumtype
);
5297 TYPE_MAX_VALUE (tem
) = TYPE_MAX_VALUE (enumtype
);
5298 TYPE_SIZE (tem
) = TYPE_SIZE (enumtype
);
5299 TYPE_SIZE_UNIT (tem
) = TYPE_SIZE_UNIT (enumtype
);
5300 TYPE_MODE (tem
) = TYPE_MODE (enumtype
);
5301 TYPE_PRECISION (tem
) = TYPE_PRECISION (enumtype
);
5302 TYPE_ALIGN (tem
) = TYPE_ALIGN (enumtype
);
5303 TYPE_USER_ALIGN (tem
) = TYPE_USER_ALIGN (enumtype
);
5304 TREE_UNSIGNED (tem
) = TREE_UNSIGNED (enumtype
);
5307 /* Finish debugging output for this type. */
5308 rest_of_type_compilation (enumtype
, toplevel
);
5313 /* Build and install a CONST_DECL for one value of the
5314 current enumeration type (one that was begun with start_enum).
5315 Return a tree-list containing the CONST_DECL and its value.
5316 Assignment of sequential values by default is handled here. */
5319 build_enumerator (tree name
, tree value
)
5323 /* Validate and default VALUE. */
5325 /* Remove no-op casts from the value. */
5327 STRIP_TYPE_NOPS (value
);
5331 if (TREE_CODE (value
) == INTEGER_CST
)
5333 value
= default_conversion (value
);
5334 constant_expression_warning (value
);
5338 error ("enumerator value for `%s' not integer constant",
5339 IDENTIFIER_POINTER (name
));
5344 /* Default based on previous value. */
5345 /* It should no longer be possible to have NON_LVALUE_EXPR
5349 value
= enum_next_value
;
5351 error ("overflow in enumeration values");
5354 if (pedantic
&& ! int_fits_type_p (value
, integer_type_node
))
5356 pedwarn ("ISO C restricts enumerator values to range of `int'");
5357 value
= convert (integer_type_node
, value
);
5360 /* Set basis for default for next value. */
5361 enum_next_value
= build_binary_op (PLUS_EXPR
, value
, integer_one_node
, 0);
5362 enum_overflow
= tree_int_cst_lt (enum_next_value
, value
);
5364 /* Now create a declaration for the enum value name. */
5366 type
= TREE_TYPE (value
);
5367 type
= c_common_type_for_size (MAX (TYPE_PRECISION (type
),
5368 TYPE_PRECISION (integer_type_node
)),
5369 (TYPE_PRECISION (type
)
5370 >= TYPE_PRECISION (integer_type_node
)
5371 && TREE_UNSIGNED (type
)));
5373 decl
= build_decl (CONST_DECL
, name
, type
);
5374 DECL_INITIAL (decl
) = convert (type
, value
);
5377 return tree_cons (decl
, value
, NULL_TREE
);
5381 /* Create the FUNCTION_DECL for a function definition.
5382 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
5383 the declaration; they describe the function's name and the type it returns,
5384 but twisted together in a fashion that parallels the syntax of C.
5386 This function creates a binding context for the function body
5387 as well as setting up the FUNCTION_DECL in current_function_decl.
5389 Returns 1 on success. If the DECLARATOR is not suitable for a function
5390 (it defines a datum instead), we return 0, which tells
5391 yyparse to report a parse error. */
5394 start_function (tree declspecs
, tree declarator
, tree attributes
)
5396 tree decl1
, old_decl
;
5398 int old_immediate_size_expand
= immediate_size_expand
;
5400 current_function_returns_value
= 0; /* Assume, until we see it does. */
5401 current_function_returns_null
= 0;
5402 current_function_returns_abnormally
= 0;
5403 warn_about_return_type
= 0;
5404 current_extern_inline
= 0;
5405 c_in_iteration_stmt
= 0;
5408 /* Don't expand any sizes in the return type of the function. */
5409 immediate_size_expand
= 0;
5411 decl1
= grokdeclarator (declarator
, declspecs
, FUNCDEF
, 1, NULL
);
5413 /* If the declarator is not suitable for a function definition,
5414 cause a syntax error. */
5417 immediate_size_expand
= old_immediate_size_expand
;
5421 decl_attributes (&decl1
, attributes
, 0);
5423 if (DECL_DECLARED_INLINE_P (decl1
)
5424 && DECL_UNINLINABLE (decl1
)
5425 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1
)))
5426 warning ("%Jinline function '%D' given attribute noinline", decl1
, decl1
);
5428 announce_function (decl1
);
5430 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1
))))
5432 error ("return type is an incomplete type");
5433 /* Make it return void instead. */
5435 = build_function_type (void_type_node
,
5436 TYPE_ARG_TYPES (TREE_TYPE (decl1
)));
5439 if (warn_about_return_type
)
5440 pedwarn_c99 ("return type defaults to `int'");
5442 /* Save the parm names or decls from this function's declarator
5443 where store_parm_decls will find them. */
5444 current_function_parms
= last_function_parms
;
5445 current_function_parm_tags
= last_function_parm_tags
;
5446 current_function_parm_others
= last_function_parm_others
;
5448 /* Make the init_value nonzero so pushdecl knows this is not tentative.
5449 error_mark_node is replaced below (in poplevel) with the BLOCK. */
5450 DECL_INITIAL (decl1
) = error_mark_node
;
5452 /* If this definition isn't a prototype and we had a prototype declaration
5453 before, copy the arg type info from that prototype.
5454 But not if what we had before was a builtin function. */
5455 old_decl
= lookup_name_current_level (DECL_NAME (decl1
));
5456 if (old_decl
!= 0 && TREE_CODE (TREE_TYPE (old_decl
)) == FUNCTION_TYPE
5457 && !DECL_BUILT_IN (old_decl
)
5458 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1
)))
5459 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl
))))
5460 && TYPE_ARG_TYPES (TREE_TYPE (decl1
)) == 0)
5462 TREE_TYPE (decl1
) = TREE_TYPE (old_decl
);
5463 current_function_prototype_locus
= DECL_SOURCE_LOCATION (old_decl
);
5466 /* Optionally warn of old-fashioned def with no previous prototype. */
5467 if (warn_strict_prototypes
5468 && TYPE_ARG_TYPES (TREE_TYPE (decl1
)) == 0
5469 && C_DECL_ISNT_PROTOTYPE (old_decl
))
5470 warning ("function declaration isn't a prototype");
5471 /* Optionally warn of any global def with no previous prototype. */
5472 else if (warn_missing_prototypes
5473 && TREE_PUBLIC (decl1
)
5474 && ! MAIN_NAME_P (DECL_NAME (decl1
))
5475 && C_DECL_ISNT_PROTOTYPE (old_decl
))
5476 warning ("%Jno previous prototype for '%D'", decl1
, decl1
);
5477 /* Optionally warn of any def with no previous prototype
5478 if the function has already been used. */
5479 else if (warn_missing_prototypes
5480 && old_decl
!= 0 && TREE_USED (old_decl
)
5481 && TYPE_ARG_TYPES (TREE_TYPE (old_decl
)) == 0)
5482 warning ("%J'%D' was used with no prototype before its definition",
5484 /* Optionally warn of any global def with no previous declaration. */
5485 else if (warn_missing_declarations
5486 && TREE_PUBLIC (decl1
)
5488 && ! MAIN_NAME_P (DECL_NAME (decl1
)))
5489 warning ("%Jno previous declaration for '%D'", decl1
, decl1
);
5490 /* Optionally warn of any def with no previous declaration
5491 if the function has already been used. */
5492 else if (warn_missing_declarations
5493 && old_decl
!= 0 && TREE_USED (old_decl
)
5494 && C_DECL_IMPLICIT (old_decl
))
5495 warning ("%J`%D' was used with no declaration before its definition",
5498 /* This is a definition, not a reference.
5499 So normally clear DECL_EXTERNAL.
5500 However, `extern inline' acts like a declaration
5501 except for defining how to inline. So set DECL_EXTERNAL in that case. */
5502 DECL_EXTERNAL (decl1
) = current_extern_inline
;
5504 /* This function exists in static storage.
5505 (This does not mean `static' in the C sense!) */
5506 TREE_STATIC (decl1
) = 1;
5508 /* A nested function is not global. */
5509 if (current_function_decl
!= 0)
5510 TREE_PUBLIC (decl1
) = 0;
5512 #ifdef ENABLE_CHECKING
5513 /* This is the earliest point at which we might know the assembler
5514 name of the function. Thus, if it's set before this, die horribly. */
5515 if (DECL_ASSEMBLER_NAME_SET_P (decl1
))
5519 /* If #pragma weak was used, mark the decl weak now. */
5520 if (current_scope
== global_scope
)
5521 maybe_apply_pragma_weak (decl1
);
5523 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
5524 if (warn_main
> 0 && MAIN_NAME_P (DECL_NAME (decl1
)))
5529 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1
)))
5530 != integer_type_node
)
5531 pedwarn ("%Jreturn type of '%D' is not `int'", decl1
, decl1
);
5533 for (args
= TYPE_ARG_TYPES (TREE_TYPE (decl1
)); args
;
5534 args
= TREE_CHAIN (args
))
5536 tree type
= args
? TREE_VALUE (args
) : 0;
5538 if (type
== void_type_node
)
5545 if (TYPE_MAIN_VARIANT (type
) != integer_type_node
)
5546 pedwarn ("%Jfirst argument of '%D' should be `int'",
5551 if (TREE_CODE (type
) != POINTER_TYPE
5552 || TREE_CODE (TREE_TYPE (type
)) != POINTER_TYPE
5553 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type
)))
5555 pedwarn ("%Jsecond argument of '%D' should be 'char **'",
5560 if (TREE_CODE (type
) != POINTER_TYPE
5561 || TREE_CODE (TREE_TYPE (type
)) != POINTER_TYPE
5562 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type
)))
5564 pedwarn ("%Jthird argument of '%D' should probably be "
5565 "'char **'", decl1
, decl1
);
5570 /* It is intentional that this message does not mention the third
5571 argument because it's only mentioned in an appendix of the
5573 if (argct
> 0 && (argct
< 2 || argct
> 3))
5574 pedwarn ("%J'%D' takes only zero or two arguments", decl1
, decl1
);
5576 if (! TREE_PUBLIC (decl1
))
5577 pedwarn ("%J'%D' is normally a non-static function", decl1
, decl1
);
5580 /* Record the decl so that the function name is defined.
5581 If we already have a decl for this name, and it is a FUNCTION_DECL,
5582 use the old decl. */
5584 current_function_decl
= pushdecl (decl1
);
5587 declare_parm_level ();
5589 make_decl_rtl (current_function_decl
, NULL
);
5591 restype
= TREE_TYPE (TREE_TYPE (current_function_decl
));
5592 /* Promote the value to int before returning it. */
5593 if (c_promoting_integer_type_p (restype
))
5595 /* It retains unsignedness if not really getting wider. */
5596 if (TREE_UNSIGNED (restype
)
5597 && (TYPE_PRECISION (restype
)
5598 == TYPE_PRECISION (integer_type_node
)))
5599 restype
= unsigned_type_node
;
5601 restype
= integer_type_node
;
5603 DECL_RESULT (current_function_decl
)
5604 = build_decl (RESULT_DECL
, NULL_TREE
, restype
);
5606 /* If this fcn was already referenced via a block-scope `extern' decl
5607 (or an implicit decl), propagate certain information about the usage. */
5608 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl
)))
5609 TREE_ADDRESSABLE (current_function_decl
) = 1;
5611 immediate_size_expand
= old_immediate_size_expand
;
5613 start_fname_decls ();
5618 /* Subroutine of store_parm_decls which handles new-style function
5619 definitions (prototype format). The parms already have decls, so we
5620 need only record them as in effect and complain if any redundant
5621 old-style parm decls were written. */
5623 store_parm_decls_newstyle (void)
5626 tree fndecl
= current_function_decl
;
5627 tree parms
= current_function_parms
;
5628 tree tags
= current_function_parm_tags
;
5629 tree others
= current_function_parm_others
;
5631 if (current_scope
->parms
|| current_scope
->names
|| current_scope
->tags
)
5633 error ("%Jold-style parameter declarations in prototyped "
5634 "function definition", fndecl
);
5636 /* Get rid of the old-style declarations. */
5641 /* Now make all the parameter declarations visible in the function body.
5642 We can bypass most of the grunt work of pushdecl. */
5643 for (last
= 0, decl
= parms
; decl
; last
= decl
, decl
= TREE_CHAIN (decl
))
5645 DECL_CONTEXT (decl
) = current_function_decl
;
5646 if (DECL_NAME (decl
) == 0)
5647 error ("%Jparameter name omitted", decl
);
5650 if (IDENTIFIER_SYMBOL_VALUE (DECL_NAME (decl
)))
5651 current_scope
->shadowed
5652 = tree_cons (DECL_NAME (decl
),
5653 IDENTIFIER_SYMBOL_VALUE (DECL_NAME (decl
)),
5654 current_scope
->shadowed
);
5655 IDENTIFIER_SYMBOL_VALUE (DECL_NAME (decl
)) = decl
;
5658 current_scope
->parms
= parms
;
5659 current_scope
->parms_last
= last
;
5661 /* Record the parameter list in the function declaration. */
5662 DECL_ARGUMENTS (fndecl
) = parms
;
5664 /* Now make all the ancillary declarations visible, likewise. */
5665 for (last
= 0, decl
= others
; decl
; last
= decl
, decl
= TREE_CHAIN (decl
))
5667 DECL_CONTEXT (decl
) = current_function_decl
;
5668 if (DECL_NAME (decl
)
5669 && TYPE_MAIN_VARIANT (TREE_TYPE (decl
)) != void_type_node
)
5671 if (IDENTIFIER_SYMBOL_VALUE (DECL_NAME (decl
)))
5672 current_scope
->shadowed
5673 = tree_cons (DECL_NAME (decl
),
5674 IDENTIFIER_SYMBOL_VALUE (DECL_NAME (decl
)),
5675 current_scope
->shadowed
);
5676 IDENTIFIER_SYMBOL_VALUE (DECL_NAME (decl
)) = decl
;
5679 current_scope
->names
= others
;
5680 current_scope
->names_last
= last
;
5682 /* And all the tag declarations. */
5683 for (decl
= tags
; decl
; decl
= TREE_CHAIN (decl
))
5684 if (TREE_PURPOSE (decl
))
5686 if (IDENTIFIER_TAG_VALUE (TREE_PURPOSE (decl
)))
5687 current_scope
->shadowed_tags
5688 = tree_cons (TREE_PURPOSE (decl
),
5689 IDENTIFIER_SYMBOL_VALUE (TREE_PURPOSE (decl
)),
5690 current_scope
->shadowed_tags
);
5691 IDENTIFIER_TAG_VALUE (TREE_PURPOSE (decl
)) = TREE_VALUE (decl
);
5693 current_scope
->tags
= tags
;
5696 /* Subroutine of store_parm_decls which handles old-style function
5697 definitions (separate parameter list and declarations). */
5700 store_parm_decls_oldstyle (void)
5702 tree parm
, decl
, last
;
5703 tree fndecl
= current_function_decl
;
5705 /* This is the identifier list from the function declarator. */
5706 tree parmids
= current_function_parms
;
5708 /* We use DECL_WEAK as a flag to show which parameters have been
5709 seen already, since it is not used on PARM_DECL. */
5710 #ifdef ENABLE_CHECKING
5711 for (parm
= current_scope
->parms
; parm
; parm
= TREE_CHAIN (parm
))
5712 if (DECL_WEAK (parm
))
5716 /* Match each formal parameter name with its declaration. Save each
5717 decl in the appropriate TREE_PURPOSE slot of the parmids chain. */
5718 for (parm
= parmids
; parm
; parm
= TREE_CHAIN (parm
))
5720 if (TREE_VALUE (parm
) == 0)
5722 error ("%Jparameter name missing from parameter list", fndecl
);
5723 TREE_PURPOSE (parm
) = 0;
5727 decl
= IDENTIFIER_SYMBOL_VALUE (TREE_VALUE (parm
));
5728 if (decl
&& DECL_CONTEXT (decl
) == fndecl
)
5730 /* If we got something other than a PARM_DECL it is an error. */
5731 if (TREE_CODE (decl
) != PARM_DECL
)
5732 error ("%J\"%D\" declared as a non-parameter", decl
, decl
);
5733 /* If the declaration is already marked, we have a duplicate
5734 name. Complain and ignore the duplicate. */
5735 else if (DECL_WEAK (decl
))
5737 error ("%Jmultiple parameters named \"%D\"", decl
, decl
);
5738 TREE_PURPOSE (parm
) = 0;
5741 /* If the declaration says "void", complain and turn it into
5743 else if (VOID_TYPE_P (TREE_TYPE (decl
)))
5745 error ("%Jparameter \"%D\" declared void", decl
, decl
);
5746 TREE_TYPE (decl
) = integer_type_node
;
5747 DECL_ARG_TYPE (decl
) = integer_type_node
;
5748 layout_decl (decl
, 0);
5751 /* If no declaration found, default to int. */
5754 decl
= build_decl (PARM_DECL
, TREE_VALUE (parm
), integer_type_node
);
5755 DECL_ARG_TYPE (decl
) = TREE_TYPE (decl
);
5756 DECL_SOURCE_LOCATION (decl
) = DECL_SOURCE_LOCATION (fndecl
);
5760 pedwarn ("%Jtype of \"%D\" defaults to \"int\"", decl
, decl
);
5761 else if (extra_warnings
)
5762 warning ("%Jtype of \"%D\" defaults to \"int\"", decl
, decl
);
5765 TREE_PURPOSE (parm
) = decl
;
5766 DECL_WEAK (decl
) = 1;
5769 /* Now examine the parms chain for incomplete declarations
5770 and declarations with no corresponding names. */
5772 for (parm
= current_scope
->parms
; parm
; parm
= TREE_CHAIN (parm
))
5774 if (!COMPLETE_TYPE_P (TREE_TYPE (parm
)))
5776 error ("%Jparameter \"%D\" has incomplete type", parm
, parm
);
5777 TREE_TYPE (parm
) = error_mark_node
;
5780 if (! DECL_WEAK (parm
))
5782 error ("%Jdeclaration for parameter \"%D\" but no such parameter",
5785 /* Pretend the parameter was not missing.
5786 This gets us to a standard state and minimizes
5787 further error messages. */
5788 parmids
= chainon (parmids
, tree_cons (parm
, 0, 0));
5792 /* Chain the declarations together in the order of the list of
5793 names. Store that chain in the function decl, replacing the
5794 list of names. Update the current scope to match. */
5795 DECL_ARGUMENTS (fndecl
) = 0;
5797 for (parm
= parmids
; parm
; parm
= TREE_CHAIN (parm
))
5798 if (TREE_PURPOSE (parm
))
5800 if (parm
&& TREE_PURPOSE (parm
))
5802 last
= TREE_PURPOSE (parm
);
5803 DECL_ARGUMENTS (fndecl
) = last
;
5804 current_scope
->parms
= last
;
5805 DECL_WEAK (last
) = 0;
5807 for (parm
= TREE_CHAIN (parm
); parm
; parm
= TREE_CHAIN (parm
))
5808 if (TREE_PURPOSE (parm
))
5810 TREE_CHAIN (last
) = TREE_PURPOSE (parm
);
5811 last
= TREE_PURPOSE (parm
);
5812 DECL_WEAK (last
) = 0;
5814 current_scope
->parms_last
= last
;
5815 TREE_CHAIN (last
) = 0;
5818 /* If there was a previous prototype,
5819 set the DECL_ARG_TYPE of each argument according to
5820 the type previously specified, and report any mismatches. */
5822 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl
)))
5825 for (parm
= DECL_ARGUMENTS (fndecl
),
5826 type
= TYPE_ARG_TYPES (TREE_TYPE (fndecl
));
5827 parm
|| (type
&& (TYPE_MAIN_VARIANT (TREE_VALUE (type
))
5828 != void_type_node
));
5829 parm
= TREE_CHAIN (parm
), type
= TREE_CHAIN (type
))
5831 if (parm
== 0 || type
== 0
5832 || TYPE_MAIN_VARIANT (TREE_VALUE (type
)) == void_type_node
)
5834 error ("number of arguments doesn't match prototype");
5835 error ("%Hprototype declaration",
5836 ¤t_function_prototype_locus
);
5839 /* Type for passing arg must be consistent with that
5840 declared for the arg. ISO C says we take the unqualified
5841 type for parameters declared with qualified type. */
5842 if (! comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm
)),
5843 TYPE_MAIN_VARIANT (TREE_VALUE (type
)),
5846 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm
))
5847 == TYPE_MAIN_VARIANT (TREE_VALUE (type
)))
5849 /* Adjust argument to match prototype. E.g. a previous
5850 `int foo(float);' prototype causes
5851 `int foo(x) float x; {...}' to be treated like
5852 `int foo(float x) {...}'. This is particularly
5853 useful for argument types like uid_t. */
5854 DECL_ARG_TYPE (parm
) = TREE_TYPE (parm
);
5856 if (targetm
.calls
.promote_prototypes (TREE_TYPE (current_function_decl
))
5857 && INTEGRAL_TYPE_P (TREE_TYPE (parm
))
5858 && TYPE_PRECISION (TREE_TYPE (parm
))
5859 < TYPE_PRECISION (integer_type_node
))
5860 DECL_ARG_TYPE (parm
) = integer_type_node
;
5864 pedwarn ("promoted argument \"%D\" "
5865 "doesn't match prototype", parm
);
5866 pedwarn ("%Hprototype declaration",
5867 ¤t_function_prototype_locus
);
5872 error ("argument \"%D\" doesn't match prototype", parm
);
5873 error ("%Hprototype declaration",
5874 ¤t_function_prototype_locus
);
5878 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl
)) = 0;
5881 /* Otherwise, create a prototype that would match. */
5885 tree actual
= 0, last
= 0, type
;
5887 for (parm
= DECL_ARGUMENTS (fndecl
); parm
; parm
= TREE_CHAIN (parm
))
5889 type
= tree_cons (NULL_TREE
, DECL_ARG_TYPE (parm
), NULL_TREE
);
5891 TREE_CHAIN (last
) = type
;
5896 type
= tree_cons (NULL_TREE
, void_type_node
, NULL_TREE
);
5898 TREE_CHAIN (last
) = type
;
5902 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
5903 of the type of this function, but we need to avoid having this
5904 affect the types of other similarly-typed functions, so we must
5905 first force the generation of an identical (but separate) type
5906 node for the relevant function type. The new node we create
5907 will be a variant of the main variant of the original function
5910 TREE_TYPE (fndecl
) = build_type_copy (TREE_TYPE (fndecl
));
5912 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl
)) = actual
;
5916 /* Store the parameter declarations into the current function declaration.
5917 This is called after parsing the parameter declarations, before
5918 digesting the body of the function.
5920 For an old-style definition, construct a prototype out of the old-style
5921 parameter declarations and inject it into the function's type. */
5924 store_parm_decls (void)
5926 tree fndecl
= current_function_decl
;
5928 /* The function containing FNDECL, if any. */
5929 tree context
= decl_function_context (fndecl
);
5931 /* True if this definition is written with a prototype. */
5932 bool prototype
= (current_function_parms
5933 && TREE_CODE (current_function_parms
) != TREE_LIST
);
5936 store_parm_decls_newstyle ();
5938 store_parm_decls_oldstyle ();
5940 /* The next call to pushlevel will be a function body. */
5942 next_is_function_body
= true;
5944 /* Write a record describing this function definition to the prototypes
5945 file (if requested). */
5947 gen_aux_info_record (fndecl
, 1, 0, prototype
);
5949 /* Initialize the RTL code for the function. */
5950 allocate_struct_function (fndecl
);
5952 /* Begin the statement tree for this function. */
5953 begin_stmt_tree (&DECL_SAVED_TREE (fndecl
));
5955 /* If this is a nested function, save away the sizes of any
5956 variable-size types so that we can expand them when generating
5962 DECL_LANG_SPECIFIC (fndecl
)->pending_sizes
5963 = nreverse (get_pending_sizes ());
5964 for (t
= DECL_LANG_SPECIFIC (fndecl
)->pending_sizes
;
5967 SAVE_EXPR_CONTEXT (TREE_VALUE (t
)) = context
;
5970 /* This function is being processed in whole-function mode. */
5971 cfun
->x_whole_function_mode_p
= 1;
5973 /* Even though we're inside a function body, we still don't want to
5974 call expand_expr to calculate the size of a variable-sized array.
5975 We haven't necessarily assigned RTL to all variables yet, so it's
5976 not safe to try to expand expressions involving them. */
5977 immediate_size_expand
= 0;
5978 cfun
->x_dont_save_pending_sizes_p
= 1;
5981 /* Finish up a function declaration and compile that function
5982 all the way to assembler language output. The free the storage
5983 for the function definition.
5985 This is called after parsing the body of the function definition. */
5988 finish_function (void)
5990 tree fndecl
= current_function_decl
;
5992 /* When a function declaration is totally empty, e.g.
5994 (the argument list is irrelevant) the compstmt rule will not
5995 bother calling pushlevel/poplevel, which means we get here with
5996 the scope stack out of sync. Detect this situation by noticing
5997 that current_scope is still as store_parm_decls left it, and do
5998 a dummy push/pop to get back to consistency.
5999 Note that the call to pushlevel does not actually push another
6000 scope - see there for details. */
6002 if (current_scope
->parm_flag
&& next_is_function_body
)
6008 if (TREE_CODE (fndecl
) == FUNCTION_DECL
6009 && targetm
.calls
.promote_prototypes (TREE_TYPE (fndecl
)))
6011 tree args
= DECL_ARGUMENTS (fndecl
);
6012 for (; args
; args
= TREE_CHAIN (args
))
6014 tree type
= TREE_TYPE (args
);
6015 if (INTEGRAL_TYPE_P (type
)
6016 && TYPE_PRECISION (type
) < TYPE_PRECISION (integer_type_node
))
6017 DECL_ARG_TYPE (args
) = integer_type_node
;
6021 if (DECL_INITIAL (fndecl
) && DECL_INITIAL (fndecl
) != error_mark_node
)
6022 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl
)) = fndecl
;
6024 /* Must mark the RESULT_DECL as being in this function. */
6026 if (DECL_RESULT (fndecl
) && DECL_RESULT (fndecl
) != error_mark_node
)
6027 DECL_CONTEXT (DECL_RESULT (fndecl
)) = fndecl
;
6029 if (MAIN_NAME_P (DECL_NAME (fndecl
)) && flag_hosted
)
6031 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl
)))
6032 != integer_type_node
)
6034 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6035 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6037 pedwarn ("%Jreturn type of '%D' is not `int'", fndecl
, fndecl
);
6041 #ifdef DEFAULT_MAIN_RETURN
6042 /* Make it so that `main' always returns success by default. */
6043 DEFAULT_MAIN_RETURN
;
6046 c_expand_return (integer_zero_node
);
6051 finish_fname_decls ();
6053 /* Tie off the statement tree for this function. */
6054 finish_stmt_tree (&DECL_SAVED_TREE (fndecl
));
6056 /* Complain if there's just no return statement. */
6057 if (warn_return_type
6058 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl
))) != VOID_TYPE
6059 && !current_function_returns_value
&& !current_function_returns_null
6060 /* Don't complain if we abort. */
6061 && !current_function_returns_abnormally
6062 /* Don't warn for main(). */
6063 && !MAIN_NAME_P (DECL_NAME (fndecl
))
6064 /* Or if they didn't actually specify a return type. */
6065 && !C_FUNCTION_IMPLICIT_INT (fndecl
)
6066 /* Normally, with -Wreturn-type, flow will complain. Unless we're an
6067 inline function, as we might never be compiled separately. */
6068 && DECL_INLINE (fndecl
))
6069 warning ("no return statement in function returning non-void");
6071 /* With just -Wextra, complain only if function returns both with
6072 and without a value. */
6074 && current_function_returns_value
6075 && current_function_returns_null
)
6076 warning ("this function may return with or without a value");
6078 /* We're leaving the context of this function, so zap cfun. It's still in
6079 DECL_SAVED_INSNS, and we'll restore it in tree_rest_of_compilation. */
6082 /* ??? Objc emits functions after finalizing the compilation unit.
6083 This should be cleaned up later and this conditional removed. */
6084 if (!cgraph_global_info_ready
)
6085 cgraph_finalize_function (fndecl
, false);
6087 c_expand_body (fndecl
);
6088 current_function_decl
= NULL
;
6091 /* Generate the RTL for a deferred function FNDECL. */
6094 c_expand_deferred_function (tree fndecl
)
6096 /* DECL_INLINE or DECL_RESULT might got cleared after the inline
6097 function was deferred, e.g. in duplicate_decls. */
6098 if (DECL_INLINE (fndecl
) && DECL_RESULT (fndecl
))
6100 if (flag_inline_trees
)
6102 timevar_push (TV_INTEGRATION
);
6103 optimize_inline_calls (fndecl
);
6104 timevar_pop (TV_INTEGRATION
);
6106 c_expand_body (fndecl
);
6107 current_function_decl
= NULL
;
6111 /* Generate the RTL for the body of FNDECL. If NESTED_P is nonzero,
6112 then we are already in the process of generating RTL for another
6116 c_expand_body_1 (tree fndecl
, int nested_p
)
6120 /* Make sure that we will evaluate variable-sized types involved
6121 in our function's type. */
6122 expand_pending_sizes (DECL_LANG_SPECIFIC (fndecl
)->pending_sizes
);
6124 /* Squirrel away our current state. */
6125 push_function_context ();
6128 tree_rest_of_compilation (fndecl
, nested_p
);
6131 /* Return to the enclosing function. */
6132 pop_function_context ();
6134 if (DECL_STATIC_CONSTRUCTOR (fndecl
))
6136 if (targetm
.have_ctors_dtors
)
6137 (* targetm
.asm_out
.constructor
) (XEXP (DECL_RTL (fndecl
), 0),
6138 DEFAULT_INIT_PRIORITY
);
6140 static_ctors
= tree_cons (NULL_TREE
, fndecl
, static_ctors
);
6143 if (DECL_STATIC_DESTRUCTOR (fndecl
))
6145 if (targetm
.have_ctors_dtors
)
6146 (* targetm
.asm_out
.destructor
) (XEXP (DECL_RTL (fndecl
), 0),
6147 DEFAULT_INIT_PRIORITY
);
6149 static_dtors
= tree_cons (NULL_TREE
, fndecl
, static_dtors
);
6153 /* Like c_expand_body_1 but only for unnested functions. */
6156 c_expand_body (tree fndecl
)
6159 if (DECL_INITIAL (fndecl
) && DECL_INITIAL (fndecl
) != error_mark_node
)
6160 c_expand_body_1 (fndecl
, 0);
6163 /* Check the declarations given in a for-loop for satisfying the C99
6166 check_for_loop_decls (void)
6172 /* If we get here, declarations have been used in a for loop without
6173 the C99 for loop scope. This doesn't make much sense, so don't
6175 error ("'for' loop initial declaration used outside C99 mode");
6178 /* C99 subclause 6.8.5 paragraph 3:
6180 [#3] The declaration part of a for statement shall only
6181 declare identifiers for objects having storage class auto or
6184 It isn't clear whether, in this sentence, "identifiers" binds to
6185 "shall only declare" or to "objects" - that is, whether all identifiers
6186 declared must be identifiers for objects, or whether the restriction
6187 only applies to those that are. (A question on this in comp.std.c
6188 in November 2000 received no answer.) We implement the strictest
6189 interpretation, to avoid creating an extension which later causes
6192 for (t
= current_scope
->tags
; t
; t
= TREE_CHAIN (t
))
6194 if (TREE_PURPOSE (t
) != 0)
6196 enum tree_code code
= TREE_CODE (TREE_VALUE (t
));
6198 if (code
== RECORD_TYPE
)
6199 error ("'struct %s' declared in 'for' loop initial declaration",
6200 IDENTIFIER_POINTER (TREE_PURPOSE (t
)));
6201 else if (code
== UNION_TYPE
)
6202 error ("'union %s' declared in 'for' loop initial declaration",
6203 IDENTIFIER_POINTER (TREE_PURPOSE (t
)));
6205 error ("'enum %s' declared in 'for' loop initial declaration",
6206 IDENTIFIER_POINTER (TREE_PURPOSE (t
)));
6210 for (t
= getdecls (); t
; t
= TREE_CHAIN (t
))
6212 if (TREE_CODE (t
) != VAR_DECL
&& DECL_NAME (t
))
6213 error ("%Jdeclaration of non-variable '%D' in 'for' loop "
6214 "initial declaration", t
, t
);
6215 else if (TREE_STATIC (t
))
6216 error ("%Jdeclaration of static variable '%D' in 'for' loop "
6217 "initial declaration", t
, t
);
6218 else if (DECL_EXTERNAL (t
))
6219 error ("%Jdeclaration of 'extern' variable '%D' in 'for' loop "
6220 "initial declaration", t
, t
);
6224 /* Save and reinitialize the variables
6225 used during compilation of a C function. */
6228 c_push_function_context (struct function
*f
)
6230 struct language_function
*p
;
6231 p
= ggc_alloc (sizeof (struct language_function
));
6234 p
->base
.x_stmt_tree
= c_stmt_tree
;
6235 p
->base
.x_scope_stmt_stack
= c_scope_stmt_stack
;
6236 p
->x_in_iteration_stmt
= c_in_iteration_stmt
;
6237 p
->x_in_case_stmt
= c_in_case_stmt
;
6238 p
->returns_value
= current_function_returns_value
;
6239 p
->returns_null
= current_function_returns_null
;
6240 p
->returns_abnormally
= current_function_returns_abnormally
;
6241 p
->warn_about_return_type
= warn_about_return_type
;
6242 p
->extern_inline
= current_extern_inline
;
6245 /* Restore the variables used during compilation of a C function. */
6248 c_pop_function_context (struct function
*f
)
6250 struct language_function
*p
= f
->language
;
6252 if (DECL_SAVED_INSNS (current_function_decl
) == 0
6253 && DECL_SAVED_TREE (current_function_decl
) == NULL_TREE
)
6255 /* Stop pointing to the local nodes about to be freed. */
6256 /* But DECL_INITIAL must remain nonzero so we know this
6257 was an actual function definition. */
6258 DECL_INITIAL (current_function_decl
) = error_mark_node
;
6259 DECL_ARGUMENTS (current_function_decl
) = 0;
6262 c_stmt_tree
= p
->base
.x_stmt_tree
;
6263 c_scope_stmt_stack
= p
->base
.x_scope_stmt_stack
;
6264 c_in_iteration_stmt
= p
->x_in_iteration_stmt
;
6265 c_in_case_stmt
= p
->x_in_case_stmt
;
6266 current_function_returns_value
= p
->returns_value
;
6267 current_function_returns_null
= p
->returns_null
;
6268 current_function_returns_abnormally
= p
->returns_abnormally
;
6269 warn_about_return_type
= p
->warn_about_return_type
;
6270 current_extern_inline
= p
->extern_inline
;
6275 /* Copy the DECL_LANG_SPECIFIC data associated with DECL. */
6278 c_dup_lang_specific_decl (tree decl
)
6280 struct lang_decl
*ld
;
6282 if (!DECL_LANG_SPECIFIC (decl
))
6285 ld
= ggc_alloc (sizeof (struct lang_decl
));
6286 memcpy (ld
, DECL_LANG_SPECIFIC (decl
), sizeof (struct lang_decl
));
6287 DECL_LANG_SPECIFIC (decl
) = ld
;
6290 /* The functions below are required for functionality of doing
6291 function at once processing in the C front end. Currently these
6292 functions are not called from anywhere in the C front end, but as
6293 these changes continue, that will change. */
6295 /* Returns nonzero if the current statement is a full expression,
6296 i.e. temporaries created during that statement should be destroyed
6297 at the end of the statement. */
6300 stmts_are_full_exprs_p (void)
6305 /* Returns the stmt_tree (if any) to which statements are currently
6306 being added. If there is no active statement-tree, NULL is
6310 current_stmt_tree (void)
6312 return &c_stmt_tree
;
6315 /* Returns the stack of SCOPE_STMTs for the current function. */
6318 current_scope_stmt_stack (void)
6320 return &c_scope_stmt_stack
;
6323 /* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
6327 anon_aggr_type_p (tree node ATTRIBUTE_UNUSED
)
6332 /* Dummy function in place of callback used by C++. */
6335 extract_interface_info (void)
6339 /* Return a new COMPOUND_STMT, after adding it to the current
6343 c_begin_compound_stmt (void)
6347 /* Create the COMPOUND_STMT. */
6348 stmt
= add_stmt (build_stmt (COMPOUND_STMT
, NULL_TREE
));
6353 /* Expand T (a DECL_STMT) if it declares an entity not handled by the
6357 c_expand_decl_stmt (tree t
)
6359 tree decl
= DECL_STMT_DECL (t
);
6361 /* Expand nested functions. */
6362 if (TREE_CODE (decl
) == FUNCTION_DECL
6363 && DECL_CONTEXT (decl
) == current_function_decl
6364 && DECL_SAVED_TREE (decl
))
6365 c_expand_body_1 (decl
, 1);
6368 /* Return the global value of T as a symbol. */
6371 identifier_global_value (tree t
)
6373 tree decl
= IDENTIFIER_SYMBOL_VALUE (t
);
6374 if (decl
== 0 || DECL_FILE_SCOPE_P (decl
))
6377 /* Shadowed by something else; find the true global value. */
6378 for (decl
= global_scope
->names
; decl
; decl
= TREE_CHAIN (decl
))
6379 if (DECL_NAME (decl
) == t
)
6382 /* Only local values for this decl. */
6386 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
6387 otherwise the name is found in ridpointers from RID_INDEX. */
6390 record_builtin_type (enum rid rid_index
, const char *name
, tree type
)
6394 id
= ridpointers
[(int) rid_index
];
6396 id
= get_identifier (name
);
6397 pushdecl (build_decl (TYPE_DECL
, id
, type
));
6400 /* Build the void_list_node (void_type_node having been created). */
6402 build_void_list_node (void)
6404 tree t
= build_tree_list (NULL_TREE
, void_type_node
);
6408 /* Return something to represent absolute declarators containing a *.
6409 TARGET is the absolute declarator that the * contains.
6410 TYPE_QUALS_ATTRS is a list of modifiers such as const or volatile
6411 to apply to the pointer type, represented as identifiers, possible mixed
6414 We return an INDIRECT_REF whose "contents" are TARGET (inside a TREE_LIST,
6415 if attributes are present) and whose type is the modifier list. */
6418 make_pointer_declarator (tree type_quals_attrs
, tree target
)
6421 tree itarget
= target
;
6422 split_specs_attrs (type_quals_attrs
, &quals
, &attrs
);
6423 if (attrs
!= NULL_TREE
)
6424 itarget
= tree_cons (attrs
, target
, NULL_TREE
);
6425 return build1 (INDIRECT_REF
, quals
, itarget
);
6428 /* A wrapper around lhd_set_decl_assembler_name that gives static
6429 variables their C names if they are at file scope and only one
6430 translation unit is being compiled, for backwards compatibility
6431 with certain bizarre assembler hacks (like crtstuff.c). */
6434 c_static_assembler_name (tree decl
)
6436 if (num_in_fnames
== 1
6437 && !TREE_PUBLIC (decl
) && DECL_CONTEXT (decl
)
6438 && TREE_CODE (DECL_CONTEXT (decl
)) == TRANSLATION_UNIT_DECL
)
6439 SET_DECL_ASSEMBLER_NAME (decl
, DECL_NAME (decl
));
6441 lhd_set_decl_assembler_name (decl
);
6444 /* Hash and equality functions for link_hash_table: key off
6445 DECL_ASSEMBLER_NAME. */
6448 link_hash_hash (const void *x_p
)
6451 return (hashval_t
) (long)DECL_ASSEMBLER_NAME (x
);
6455 link_hash_eq (const void *x1_p
, const void *x2_p
)
6457 tree x1
= (tree
)x1_p
;
6458 tree x2
= (tree
)x2_p
;
6459 return DECL_ASSEMBLER_NAME (x1
) == DECL_ASSEMBLER_NAME (x2
);
6462 /* Propagate information between definitions and uses between multiple
6463 translation units in TU_LIST based on linkage rules. */
6466 merge_translation_unit_decls (void)
6468 const tree tu_list
= current_file_decl
;
6471 htab_t link_hash_table
;
6474 /* Create the BLOCK that poplevel would have created, but don't
6475 actually call poplevel since that's expensive. */
6476 block
= make_node (BLOCK
);
6477 BLOCK_VARS (block
) = current_scope
->names
;
6478 TREE_USED (block
) = 1;
6479 DECL_INITIAL (current_file_decl
) = block
;
6481 /* If only one translation unit seen, no copying necessary. */
6482 if (TREE_CHAIN (tu_list
) == NULL_TREE
)
6485 link_hash_table
= htab_create (1021, link_hash_hash
, link_hash_eq
, NULL
);
6487 /* Enter any actual definitions into the hash table. */
6488 for (tu
= tu_list
; tu
; tu
= TREE_CHAIN (tu
))
6489 for (decl
= BLOCK_VARS (DECL_INITIAL (tu
)); decl
; decl
= TREE_CHAIN (decl
))
6490 if (TREE_PUBLIC (decl
) && ! DECL_EXTERNAL (decl
))
6493 slot
= htab_find_slot (link_hash_table
, decl
, INSERT
);
6495 /* If we've already got a definition, work out which one is
6496 the real one, put it into the hash table, and make the
6497 other one DECL_EXTERNAL. This is important to avoid
6498 putting out two definitions of the same symbol in the
6502 tree old_decl
= (tree
) *slot
;
6504 /* If this is weak or common or whatever, suppress it
6505 in favor of the other definition. */
6506 if (DECL_WEAK (decl
))
6507 DECL_EXTERNAL (decl
) = 1;
6508 else if (DECL_WEAK (old_decl
) && ! DECL_WEAK (decl
))
6509 DECL_EXTERNAL (old_decl
) = 1;
6510 else if (DECL_COMMON (decl
) || DECL_ONE_ONLY (decl
))
6511 DECL_EXTERNAL (decl
) = 1;
6512 else if (DECL_COMMON (old_decl
) || DECL_ONE_ONLY (old_decl
))
6513 DECL_EXTERNAL (old_decl
) = 1;
6515 if (DECL_EXTERNAL (decl
))
6517 DECL_INITIAL (decl
) = NULL_TREE
;
6518 DECL_COMMON (decl
) = 0;
6519 DECL_ONE_ONLY (decl
) = 0;
6520 DECL_WEAK (decl
) = 0;
6522 else if (DECL_EXTERNAL (old_decl
))
6524 DECL_INITIAL (old_decl
) = NULL_TREE
;
6525 DECL_COMMON (old_decl
) = 0;
6526 DECL_ONE_ONLY (old_decl
) = 0;
6527 DECL_WEAK (old_decl
) = 0;
6532 error ("%Jredefinition of global '%D'", decl
, decl
);
6533 error ("%J'%D' previously defined here", old_decl
, old_decl
);
6540 /* Now insert the desired information from all the definitions
6541 into any plain declarations. */
6542 for (tu
= tu_list
; tu
; tu
= TREE_CHAIN (tu
))
6543 for (decl
= BLOCK_VARS (DECL_INITIAL (tu
)); decl
; decl
= TREE_CHAIN (decl
))
6544 if (TREE_PUBLIC (decl
) && DECL_EXTERNAL (decl
))
6547 global_decl
= htab_find (link_hash_table
, decl
);
6552 /* Print any appropriate error messages, and partially merge
6554 (void) duplicate_decls (decl
, global_decl
);
6557 htab_delete (link_hash_table
);
6560 /* Perform final processing on file-scope data. */
6563 c_write_global_declarations(void)
6567 for (link
= current_file_decl
; link
; link
= TREE_CHAIN (link
))
6569 tree globals
= BLOCK_VARS (DECL_INITIAL (link
));
6570 int len
= list_length (globals
);
6571 tree
*vec
= xmalloc (sizeof (tree
) * len
);
6575 /* Process the decls in the order they were written. */
6577 for (i
= 0, decl
= globals
; i
< len
; i
++, decl
= TREE_CHAIN (decl
))
6580 wrapup_global_declarations (vec
, len
);
6582 check_global_declarations (vec
, len
);
6589 /* Reset the parser's state in preparation for a new file. */
6592 c_reset_state (void)
6595 tree file_scope_decl
;
6597 /* Pop the global scope. */
6598 if (current_scope
!= global_scope
)
6599 current_scope
= global_scope
;
6600 file_scope_decl
= current_file_decl
;
6601 DECL_INITIAL (file_scope_decl
) = poplevel (1, 0, 0);
6602 BLOCK_SUPERCONTEXT (DECL_INITIAL (file_scope_decl
)) = file_scope_decl
;
6603 truly_local_externals
= NULL_TREE
;
6605 /* Start a new global binding level. */
6607 global_scope
= current_scope
;
6608 current_file_decl
= build_decl (TRANSLATION_UNIT_DECL
, NULL
, NULL
);
6609 TREE_CHAIN (current_file_decl
) = file_scope_decl
;
6611 /* Reintroduce the builtin declarations. */
6612 for (link
= first_builtin_decl
;
6613 link
!= TREE_CHAIN (last_builtin_decl
);
6614 link
= TREE_CHAIN (link
))
6615 pushdecl (copy_node (link
));
6618 #include "gt-c-decl.h"