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 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 BITFIELD
, /* Likewise but with specified width */
65 TYPENAME
}; /* Typename (inside cast or sizeof) */
68 /* Nonzero if we have seen an invalid cross reference
69 to a struct, union, or enum, but not yet printed the message. */
71 tree pending_invalid_xref
;
72 /* File and line to appear in the eventual error message. */
73 location_t pending_invalid_xref_location
;
75 /* While defining an enum type, this is 1 plus the last enumerator
76 constant value. Note that will do not have to save this or `enum_overflow'
77 around nested function definition since such a definition could only
78 occur in an enum value expression and we don't use these variables in
81 static tree enum_next_value
;
83 /* Nonzero means that there was overflow computing enum_next_value. */
85 static int enum_overflow
;
87 /* Parsing a function declarator leaves a list of parameter names
88 or a chain of parameter decls here. */
90 static tree last_function_parms
;
92 /* ... and a chain of structure and enum types declared in the
95 static tree last_function_parm_tags
;
97 /* ... and a chain of all non-parameter declarations (such as
98 CONST_DECLs from enumerations) here. */
100 static tree last_function_parm_others
;
102 /* After parsing the declarator that starts a function definition,
103 `start_function' puts the list of parameter names or chain of decls here
104 for `store_parm_decls' to find. */
106 static tree current_function_parms
;
108 /* Similar, for last_function_parm_tags. */
110 static tree current_function_parm_tags
;
112 /* And for last_function_parm_others. */
114 static tree current_function_parm_others
;
116 /* Similar, for the file and line that the prototype came from if this is
117 an old-style definition. */
119 static location_t current_function_prototype_locus
;
121 /* The current statement tree. */
123 static GTY(()) struct stmt_tree_s c_stmt_tree
;
125 /* The current scope statement stack. */
127 static GTY(()) tree c_scope_stmt_stack
;
129 /* A list of external DECLs that appeared at block scope when there was
130 some other global meaning for that identifier. */
131 static GTY(()) tree truly_local_externals
;
133 /* A list of the builtin file-scope DECLs. */
135 static GTY(()) tree builtin_decls
;
137 /* A DECL for the current file-scope context. */
139 static GTY(()) tree current_file_decl
;
141 /* Set to 0 at beginning of a function definition, set to 1 if
142 a return statement that specifies a return value is seen. */
144 int current_function_returns_value
;
146 /* Set to 0 at beginning of a function definition, set to 1 if
147 a return statement with no argument is seen. */
149 int current_function_returns_null
;
151 /* Set to 0 at beginning of a function definition, set to 1 if
152 a call to a noreturn function is seen. */
154 int current_function_returns_abnormally
;
156 /* Set to nonzero by `grokdeclarator' for a function
157 whose return type is defaulted, if warnings for this are desired. */
159 static int warn_about_return_type
;
161 /* Nonzero when starting a function declared `extern inline'. */
163 static int current_extern_inline
;
165 /* Each c_scope structure describes the complete contents of one scope.
166 Three scopes are distinguished specially: the innermost or current
167 scope, the innermost function scope, and the outermost or file scope.
169 Most declarations are recorded in the current scope.
171 All normal label declarations are recorded in the innermost
172 function scope, as are bindings of undeclared identifiers to
173 error_mark_node. (GCC permits nested functions as an extension,
174 hence the 'innermost' qualifier.) Explicitly declared labels
175 (using the __label__ extension) appear in the current scope.
177 Being in the global scope (current_scope == global_scope) causes
178 special behavior in several places below. Also, under some
179 conditions the Objective-C front end records declarations in the
180 global scope even though that isn't the current scope.
182 The order of the names, parms, and blocks lists matters, and they
183 are frequently appended to. To avoid having to walk all the way to
184 the end of the list on each insertion, or reverse the lists later,
185 we maintain a pointer to the last list entry for each of the lists.
187 The order of the tags, shadowed, shadowed_tags, and incomplete
188 lists does not matter, so we just prepend to these lists. */
190 struct c_scope
GTY(())
192 /* The scope containing this one. */
193 struct c_scope
*outer
;
195 /* The next outermost function scope. */
196 struct c_scope
*outer_function
;
198 /* All variables, constants, functions, labels, and typedef names. */
202 /* All parameter declarations. Used only in the outermost scope of
207 /* All structure, union, and enum type tags. */
210 /* For each scope, a list of shadowed outer-scope definitions
211 to be restored when this scope is popped.
212 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
213 whose TREE_VALUE is its old definition (a kind of ..._DECL node). */
216 /* For each scope, a list of shadowed outer-scope tag definitions
217 to be restored when this scope is popped.
218 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
219 whose TREE_VALUE is its old definition (a kind of ..._TYPE node). */
222 /* For each scope (except the global one), a chain of BLOCK nodes
223 for all the scopes that were entered and exited one level down. */
227 /* Variable declarations with incomplete type in this scope. */
230 /* True if we are currently filling this scope with parameter
234 /* True if we already complained about forward parameter decls
235 in this scope. This prevents double warnings on
236 foo (int a; int b; ...) */
237 bool warned_forward_parm_decls
: 1;
239 /* True if this is the outermost block scope of a function body.
240 This scope contains the parameters, the local variables declared
241 in the outermost block, and all the labels (except those in
242 nested functions, or declared at block scope with __label__). */
243 bool function_body
: 1;
245 /* True means make a BLOCK for this scope no matter what. */
249 /* The scope currently in effect. */
251 static GTY(()) struct c_scope
*current_scope
;
253 /* A chain of c_scope structures awaiting reuse. */
255 static GTY((deletable (""))) struct c_scope
*scope_freelist
;
257 /* The innermost function scope. Ordinary (not explicitly declared)
258 labels, bindings to error_mark_node, and the lazily-created
259 bindings of __func__ and its friends get this scope. */
261 static GTY(()) struct c_scope
*current_function_scope
;
263 /* The outermost scope, corresponding to the C "file scope". This is
264 created when the compiler is started and exists through the entire run. */
266 static GTY(()) struct c_scope
*global_scope
;
268 /* Append VAR to LIST in scope SCOPE. */ \
269 #define SCOPE_LIST_APPEND(scope, list, decl) do { \
270 struct c_scope *s_ = (scope); \
272 if (s_->list##_last) \
273 TREE_CHAIN (s_->list##_last) = d_; \
276 s_->list##_last = d_; \
279 /* Concatenate FROM in scope FSCOPE onto TO in scope TSCOPE. */
280 #define SCOPE_LIST_CONCAT(tscope, to, fscope, from) do { \
281 struct c_scope *t_ = (tscope); \
282 struct c_scope *f_ = (fscope); \
284 TREE_CHAIN (t_->to##_last) = f_->from; \
287 t_->to##_last = f_->from##_last; \
290 /* True means unconditionally make a BLOCK for the next scope pushed. */
292 static bool keep_next_level_flag
;
294 /* True means the next call to pushlevel will be the outermost scope
295 of a function body, so do not push a new scope, merely cease
296 expecting parameter decls. */
298 static bool next_is_function_body
;
300 /* Functions called automatically at the beginning and end of execution. */
302 tree static_ctors
, static_dtors
;
304 /* Forward declarations. */
306 static struct c_scope
*make_scope (void);
307 static void pop_scope (void);
308 static tree
match_builtin_function_types (tree
, tree
);
309 static int duplicate_decls (tree
, tree
, int, int);
310 static int redeclaration_error_message (tree
, tree
);
311 static tree
make_label (tree
, location_t
);
312 static void bind_label (tree
, tree
, struct c_scope
*);
313 static void implicit_decl_warning (tree
);
314 static tree
lookup_tag (enum tree_code
, tree
, int);
315 static tree
lookup_name_current_level (tree
);
316 static tree
grokdeclarator (tree
, tree
, enum decl_context
, int);
317 static tree
grokparms (tree
, int);
318 static void layout_array_type (tree
);
319 static void store_parm_decls_newstyle (void);
320 static void store_parm_decls_oldstyle (void);
321 static tree
c_make_fname_decl (tree
, int);
322 static void c_expand_body_1 (tree
, int);
323 static tree
any_external_decl (tree
);
324 static void record_external_decl (tree
);
325 static void warn_if_shadowing (tree
, tree
);
326 static void clone_underlying_type (tree
);
327 static bool flexible_array_type_p (tree
);
328 static hashval_t
link_hash_hash (const void *);
329 static int link_hash_eq (const void *, const void *);
331 /* States indicating how grokdeclarator() should handle declspecs marked
332 with __attribute__((deprecated)). An object declared as
333 __attribute__((deprecated)) suppresses warnings of uses of other
336 enum deprecated_states
{
341 static enum deprecated_states deprecated_state
= DEPRECATED_NORMAL
;
344 c_print_identifier (FILE *file
, tree node
, int indent
)
346 print_node (file
, "symbol", IDENTIFIER_SYMBOL_VALUE (node
), indent
+ 4);
347 print_node (file
, "tag", IDENTIFIER_TAG_VALUE (node
), indent
+ 4);
348 print_node (file
, "label", IDENTIFIER_LABEL_VALUE (node
), indent
+ 4);
349 if (C_IS_RESERVED_WORD (node
))
351 tree rid
= ridpointers
[C_RID_CODE (node
)];
352 indent_to (file
, indent
+ 4);
353 fprintf (file
, "rid " HOST_PTR_PRINTF
" \"%s\"",
354 (void *) rid
, IDENTIFIER_POINTER (rid
));
358 /* Hook called at end of compilation to assume 1 elt
359 for a file-scope tentative array defn that wasn't complete before. */
362 c_finish_incomplete_decl (tree decl
)
364 if (TREE_CODE (decl
) == VAR_DECL
)
366 tree type
= TREE_TYPE (decl
);
367 if (type
!= error_mark_node
368 && TREE_CODE (type
) == ARRAY_TYPE
369 && ! DECL_EXTERNAL (decl
)
370 && TYPE_DOMAIN (type
) == 0)
372 warning ("%Harray '%D' assumed to have one element",
373 &DECL_SOURCE_LOCATION (decl
), decl
);
375 complete_array_type (type
, NULL_TREE
, 1);
377 layout_decl (decl
, 0);
382 /* Reuse or create a struct for this scope. */
384 static struct c_scope
*
387 struct c_scope
*result
;
390 result
= scope_freelist
;
391 scope_freelist
= result
->outer
;
394 result
= ggc_alloc_cleared (sizeof (struct c_scope
));
399 /* Remove the topmost scope from the stack and add it to the
400 free list, updating current_function_scope if necessary. */
405 struct c_scope
*scope
= current_scope
;
407 current_scope
= scope
->outer
;
408 if (scope
->function_body
)
409 current_function_scope
= scope
->outer_function
;
411 memset (scope
, 0, sizeof (struct c_scope
));
412 scope
->outer
= scope_freelist
;
413 scope_freelist
= scope
;
416 /* Nonzero if we are currently in the global scope. */
419 global_bindings_p (void)
421 return current_scope
== global_scope
;
425 keep_next_level (void)
427 keep_next_level_flag
= true;
430 /* Identify this scope as currently being filled with parameters. */
433 declare_parm_level (void)
435 current_scope
->parm_flag
= true;
438 /* Nonzero if currently making parm declarations. */
441 in_parm_level_p (void)
443 return current_scope
->parm_flag
;
446 /* Enter a new scope. The dummy parameter is for signature
447 compatibility with lang_hooks.decls.pushlevel. */
450 pushlevel (int dummy ATTRIBUTE_UNUSED
)
452 if (next_is_function_body
)
454 /* This is the transition from the parameters to the top level
455 of the function body. These are the same scope
456 (C99 6.2.1p4,6) so we do not push another scope structure.
457 next_is_function_body is set only by store_parm_decls, which
458 in turn is called when and only when we are about to
459 encounter the opening curly brace for the function body.
461 The outermost block of a function always gets a BLOCK node,
462 because the debugging output routines expect that each
463 function has at least one BLOCK. */
464 current_scope
->parm_flag
= false;
465 current_scope
->function_body
= true;
466 current_scope
->keep
= true;
467 current_scope
->outer_function
= current_function_scope
;
468 current_function_scope
= current_scope
;
470 keep_next_level_flag
= false;
471 next_is_function_body
= false;
475 struct c_scope
*scope
= make_scope ();
477 scope
->keep
= keep_next_level_flag
;
478 scope
->outer
= current_scope
;
479 current_scope
= scope
;
480 keep_next_level_flag
= false;
484 /* Exit a scope. Restore the state of the identifier-decl mappings
485 that were in effect when this scope was entered.
487 If KEEP is KEEP_YES (1), this scope had explicit declarations, so
488 create a BLOCK node to record its declarations and subblocks for
489 debugging output. If KEEP is KEEP_MAYBE, do so only if the names
490 or tags lists are nonempty.
492 The second parameter is ignored; it is present only for
493 signature compatibility with lang_hooks.decls.poplevel.
495 If FUNCTIONBODY is nonzero, this level is the body of a function,
496 even if current_scope->function_body is not set. This is used
497 by language-independent code that generates synthetic functions,
498 and cannot set current_scope->function_body.
500 FIXME: Eliminate the need for all arguments. */
503 poplevel (int keep
, int dummy ATTRIBUTE_UNUSED
, int functionbody
)
505 struct c_scope
*scope
= current_scope
;
510 scope
->function_body
|= functionbody
;
512 if (keep
== KEEP_MAYBE
)
513 keep
= (scope
->names
|| scope
->tags
);
516 keep
|= scope
->function_body
;
518 /* If appropriate, create a BLOCK to record the decls for the life
523 block
= make_node (BLOCK
);
524 BLOCK_VARS (block
) = scope
->names
;
525 BLOCK_SUBBLOCKS (block
) = scope
->blocks
;
526 TREE_USED (block
) = 1;
529 /* In each subblock, record that this is its superior. */
530 for (p
= scope
->blocks
; p
; p
= TREE_CHAIN (p
))
531 BLOCK_SUPERCONTEXT (p
) = block
;
533 /* Clear out the variable bindings in this scope.
535 Propagate TREE_ADDRESSABLE from nested functions to their
536 containing functions.
538 Issue warnings for unused variables and labels, and errors for
539 undefined labels, if there are any. */
541 for (p
= scope
->names
; p
; p
= TREE_CHAIN (p
))
543 const location_t
*locus
= &DECL_SOURCE_LOCATION (p
);
545 switch (TREE_CODE (p
))
548 if (TREE_USED (p
) && !DECL_INITIAL (p
))
550 error ("%Hlabel `%D' used but not defined", locus
, p
);
551 DECL_INITIAL (p
) = error_mark_node
;
553 else if (!TREE_USED (p
) && warn_unused_label
)
555 if (DECL_INITIAL (p
))
556 warning ("%Hlabel `%D' defined but not used", locus
, p
);
558 warning ("%Hlabel `%D' declared but not defined", locus
, p
);
561 IDENTIFIER_LABEL_VALUE (DECL_NAME (p
)) = 0;
565 if (! TREE_ASM_WRITTEN (p
)
566 && DECL_INITIAL (p
) != 0
567 && TREE_ADDRESSABLE (p
)
568 && DECL_ABSTRACT_ORIGIN (p
) != 0
569 && DECL_ABSTRACT_ORIGIN (p
) != p
)
570 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (p
)) = 1;
574 /* keep this in sync with stmt.c:warn_about_unused_variables.
575 No warnings when the global scope is popped because the
576 global scope isn't popped for the last translation unit,
577 so the warnings are done in c_write_global_declaration. */
578 if (warn_unused_variable
&& scope
!= global_scope
580 && !DECL_IN_SYSTEM_HEADER (p
)
582 && !DECL_ARTIFICIAL (p
))
583 warning ("%Hunused variable `%D'", locus
, p
);
590 if (DECL_EXTERNAL (p
) && scope
!= global_scope
)
591 /* External decls stay in the symbol-value slot but are
593 C_DECL_INVISIBLE (p
) = 1;
595 IDENTIFIER_SYMBOL_VALUE (DECL_NAME (p
)) = 0;
601 /* Clear out the parameter bindings in this scope, if any.
602 Unused-parameter warnings are handled by function.c. */
603 for (p
= scope
->parms
; p
; p
= TREE_CHAIN (p
))
605 IDENTIFIER_SYMBOL_VALUE (DECL_NAME (p
)) = 0;
607 /* Clear out the tag-meanings declared in this scope.
609 Set the TYPE_CONTEXTs for all of the tagged types belonging to
610 this scope so that they point to the appropriate construct, i.e.
611 either to the current FUNCTION_DECL node, or else to the BLOCK
612 node we just constructed.
614 Note that for tagged types whose scope is just the formal
615 parameter list for some function type specification, we can't
616 properly set their TYPE_CONTEXTs here, because we don't have a
617 pointer to the appropriate FUNCTION_TYPE node readily available
618 to us. For those cases, the TYPE_CONTEXTs of the relevant tagged
619 type nodes get set in `grokdeclarator' as soon as we have created
620 the FUNCTION_TYPE node which will represent the "scope" for these
621 "parameter list local" tagged types. */
623 decl
= scope
->function_body
? current_function_decl
: block
;
624 for (p
= scope
->tags
; p
; p
= TREE_CHAIN (p
))
626 if (TREE_PURPOSE (p
))
627 IDENTIFIER_TAG_VALUE (TREE_PURPOSE (p
)) = 0;
629 TYPE_CONTEXT (TREE_VALUE (p
)) = decl
;
632 /* Restore all name- and label-meanings from outer scopes that were
633 shadowed by this scope. */
634 for (p
= scope
->shadowed
; p
; p
= TREE_CHAIN (p
))
635 if (TREE_VALUE (p
) && TREE_CODE (TREE_VALUE (p
)) == LABEL_DECL
)
636 IDENTIFIER_LABEL_VALUE (TREE_PURPOSE (p
)) = TREE_VALUE (p
);
638 IDENTIFIER_SYMBOL_VALUE (TREE_PURPOSE (p
)) = TREE_VALUE (p
);
640 /* Restore all tag-meanings from outer scopes that were shadowed by
642 for (p
= scope
->shadowed_tags
; p
; p
= TREE_CHAIN (p
))
643 IDENTIFIER_TAG_VALUE (TREE_PURPOSE (p
)) = TREE_VALUE (p
);
645 /* Dispose of the block that we just made inside some higher level. */
646 if (scope
->function_body
)
647 DECL_INITIAL (current_function_decl
) = block
;
648 else if (scope
->outer
)
651 SCOPE_LIST_APPEND (scope
->outer
, blocks
, block
);
652 /* If we did not make a block for the scope just exited, any
653 blocks made for inner scopes must be carried forward so they
654 will later become subblocks of something else. */
655 else if (scope
->blocks
)
656 SCOPE_LIST_CONCAT (scope
->outer
, blocks
, scope
, blocks
);
659 /* Pop the current scope, and free the structure for reuse. */
665 /* Insert BLOCK at the end of the list of subblocks of the current
666 scope. This is used when a BIND_EXPR is expanded, to handle the
667 BLOCK node inside the BIND_EXPR. */
670 insert_block (tree block
)
672 TREE_USED (block
) = 1;
673 SCOPE_LIST_APPEND (current_scope
, blocks
, block
);
676 /* Set the BLOCK node for the innermost scope (the one we are
677 currently in). The RTL expansion machinery requires us to provide
678 this hook, but it is not useful in function-at-a-time mode. */
681 set_block (tree block ATTRIBUTE_UNUSED
)
685 /* Push a definition or a declaration of struct, union or enum tag "name".
686 "type" should be the type node.
687 We assume that the tag "name" is not already defined.
689 Note that the definition may really be just a forward reference.
690 In that case, the TYPE_SIZE will be zero. */
693 pushtag (tree name
, tree type
)
695 struct c_scope
*b
= current_scope
;
697 /* Record the identifier as the type's name if it has none. */
700 if (TYPE_NAME (type
) == 0)
701 TYPE_NAME (type
) = name
;
703 if (IDENTIFIER_TAG_VALUE (name
))
704 b
->shadowed_tags
= tree_cons (name
, IDENTIFIER_TAG_VALUE (name
),
706 IDENTIFIER_TAG_VALUE (name
) = type
;
709 b
->tags
= tree_cons (name
, type
, b
->tags
);
711 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
712 tagged type we just added to the current scope. This fake
713 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
714 to output a representation of a tagged type, and it also gives
715 us a convenient place to record the "scope start" address for the
718 TYPE_STUB_DECL (type
) = pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, type
));
720 /* An approximation for now, so we can tell this is a function-scope tag.
721 This will be updated in poplevel. */
722 TYPE_CONTEXT (type
) = DECL_CONTEXT (TYPE_STUB_DECL (type
));
725 /* Subroutine of duplicate_decls. Allow harmless mismatches in return
726 and argument types provided that the type modes match. This function
727 return a unified type given a suitable match, and 0 otherwise. */
730 match_builtin_function_types (tree oldtype
, tree newtype
)
732 tree newrettype
, oldrettype
;
733 tree newargs
, oldargs
;
734 tree trytype
, tryargs
;
736 /* Accept the return type of the new declaration if same modes. */
737 oldrettype
= TREE_TYPE (oldtype
);
738 newrettype
= TREE_TYPE (newtype
);
740 if (TYPE_MODE (oldrettype
) != TYPE_MODE (newrettype
))
743 oldargs
= TYPE_ARG_TYPES (oldtype
);
744 newargs
= TYPE_ARG_TYPES (newtype
);
747 while (oldargs
|| newargs
)
751 || ! TREE_VALUE (oldargs
)
752 || ! TREE_VALUE (newargs
)
753 || TYPE_MODE (TREE_VALUE (oldargs
))
754 != TYPE_MODE (TREE_VALUE (newargs
)))
757 oldargs
= TREE_CHAIN (oldargs
);
758 newargs
= TREE_CHAIN (newargs
);
761 trytype
= build_function_type (newrettype
, tryargs
);
762 return build_type_attribute_variant (trytype
, TYPE_ATTRIBUTES (oldtype
));
765 /* Handle when a new declaration NEWDECL
766 has the same name as an old one OLDDECL
767 in the same binding contour.
768 Prints an error message if appropriate.
770 If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
773 When DIFFERENT_BINDING_LEVEL is true, NEWDECL is an external declaration,
774 and OLDDECL is in an outer scope and should thus not be changed. */
777 duplicate_decls (tree newdecl
, tree olddecl
, int different_binding_level
,
780 int comptype_flags
= (different_tu
? COMPARE_DIFFERENT_TU
782 int types_match
= comptypes (TREE_TYPE (newdecl
), TREE_TYPE (olddecl
),
784 int new_is_definition
= (TREE_CODE (newdecl
) == FUNCTION_DECL
785 && DECL_INITIAL (newdecl
) != 0);
786 tree oldtype
= TREE_TYPE (olddecl
);
787 tree newtype
= TREE_TYPE (newdecl
);
790 if (DECL_P (olddecl
))
792 if (TREE_CODE (newdecl
) == FUNCTION_DECL
793 && TREE_CODE (olddecl
) == FUNCTION_DECL
794 && (DECL_UNINLINABLE (newdecl
) || DECL_UNINLINABLE (olddecl
)))
796 if (DECL_DECLARED_INLINE_P (newdecl
)
797 && DECL_UNINLINABLE (newdecl
)
798 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl
)))
799 /* Already warned elsewhere. */;
800 else if (DECL_DECLARED_INLINE_P (olddecl
)
801 && DECL_UNINLINABLE (olddecl
)
802 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl
)))
803 /* Already warned. */;
804 else if (DECL_DECLARED_INLINE_P (newdecl
)
805 && ! DECL_DECLARED_INLINE_P (olddecl
)
806 && DECL_UNINLINABLE (olddecl
)
807 && lookup_attribute ("noinline", DECL_ATTRIBUTES (olddecl
)))
809 warning ("%Hfunction '%D' redeclared as inline",
810 &DECL_SOURCE_LOCATION (newdecl
), newdecl
);
811 warning ("%Hprevious declaration of function '%D' "
812 "with attribute noinline",
813 &DECL_SOURCE_LOCATION (olddecl
), olddecl
);
815 else if (DECL_DECLARED_INLINE_P (olddecl
)
816 && DECL_UNINLINABLE (newdecl
)
817 && lookup_attribute ("noinline", DECL_ATTRIBUTES (newdecl
)))
819 warning ("%Hfunction '%D' redeclared with attribute noinline",
820 &DECL_SOURCE_LOCATION (newdecl
), newdecl
);
821 warning ("%Hprevious declaration of function '%D' was inline",
822 &DECL_SOURCE_LOCATION (olddecl
), olddecl
);
826 DECL_ATTRIBUTES (newdecl
)
827 = (*targetm
.merge_decl_attributes
) (olddecl
, newdecl
);
830 if (TREE_CODE (newtype
) == ERROR_MARK
831 || TREE_CODE (oldtype
) == ERROR_MARK
)
834 /* New decl is completely inconsistent with the old one =>
835 tell caller to replace the old one.
836 This is always an error except in the case of shadowing a builtin. */
837 if (TREE_CODE (olddecl
) != TREE_CODE (newdecl
))
839 if (TREE_CODE (olddecl
) == FUNCTION_DECL
840 && DECL_BUILT_IN (olddecl
))
842 /* If you declare a built-in or predefined function name as static,
843 the old definition is overridden,
844 but optionally warn this was a bad choice of name. */
845 if (!TREE_PUBLIC (newdecl
))
848 warning ("%Hshadowing built-in function '%D'",
849 &DECL_SOURCE_LOCATION (newdecl
), newdecl
);
852 warning ("%Hbuilt-in function '%D' declared as non-function",
853 &DECL_SOURCE_LOCATION (newdecl
), newdecl
);
857 error ("%H'%D' redeclared as different kind of symbol",
858 &DECL_SOURCE_LOCATION (newdecl
), newdecl
);
859 error ("%Hprevious declaration of '%D'",
860 &DECL_SOURCE_LOCATION (olddecl
), olddecl
);
866 /* For real parm decl following a forward decl, return 1 so old decl
867 will be reused. Only allow this to happen once. */
868 if (types_match
&& TREE_CODE (newdecl
) == PARM_DECL
869 && TREE_ASM_WRITTEN (olddecl
) && ! TREE_ASM_WRITTEN (newdecl
))
871 TREE_ASM_WRITTEN (olddecl
) = 0;
875 /* The new declaration is the same kind of object as the old one.
876 The declarations may partially match. Print warnings if they don't
877 match enough. Ultimately, copy most of the information from the new
878 decl to the old one, and keep using the old one. */
880 if (TREE_CODE (olddecl
) == FUNCTION_DECL
&& DECL_BUILT_IN (olddecl
))
882 /* A function declaration for a built-in function. */
883 if (!TREE_PUBLIC (newdecl
))
885 /* If you declare a built-in function name as static, the
886 built-in definition is overridden,
887 but optionally warn this was a bad choice of name. */
889 warning ("%Hshadowing built-in function '%D'",
890 &DECL_SOURCE_LOCATION (newdecl
), newdecl
);
891 /* Discard the old built-in function. */
896 /* Accept harmless mismatch in function types.
897 This is for the ffs and fprintf builtins. */
898 tree trytype
= match_builtin_function_types (oldtype
, newtype
);
902 types_match
= comptypes (newtype
, trytype
, comptype_flags
);
905 if (! different_binding_level
)
906 TREE_TYPE (olddecl
) = oldtype
;
911 /* If types don't match for a built-in, throw away the built-in. */
912 warning ("%Hconflicting types for built-in function '%D'",
913 &DECL_SOURCE_LOCATION (newdecl
), newdecl
);
917 else if (TREE_CODE (olddecl
) == FUNCTION_DECL
918 && DECL_SOURCE_LINE (olddecl
) == 0)
920 /* A function declaration for a predeclared function
921 that isn't actually built in. */
922 if (!TREE_PUBLIC (newdecl
))
924 /* If you declare it as static, the
925 default definition is overridden. */
928 else if (!types_match
)
930 /* If the types don't match, preserve volatility indication.
931 Later on, we will discard everything else about the
932 default declaration. */
933 TREE_THIS_VOLATILE (newdecl
) |= TREE_THIS_VOLATILE (olddecl
);
936 /* Permit char *foo () to match void *foo (...) if not pedantic,
937 if one of them came from a system header file. */
938 else if (!types_match
939 && TREE_CODE (olddecl
) == FUNCTION_DECL
940 && TREE_CODE (newdecl
) == FUNCTION_DECL
941 && TREE_CODE (TREE_TYPE (oldtype
)) == POINTER_TYPE
942 && TREE_CODE (TREE_TYPE (newtype
)) == POINTER_TYPE
943 && (DECL_IN_SYSTEM_HEADER (olddecl
)
944 || DECL_IN_SYSTEM_HEADER (newdecl
))
945 && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype
))) == void_type_node
946 && TYPE_ARG_TYPES (oldtype
) == 0
947 && self_promoting_args_p (TYPE_ARG_TYPES (newtype
))
948 && TREE_TYPE (TREE_TYPE (oldtype
)) == char_type_node
)
950 (TREE_TYPE (TREE_TYPE (newtype
)) == char_type_node
951 && TYPE_ARG_TYPES (newtype
) == 0
952 && self_promoting_args_p (TYPE_ARG_TYPES (oldtype
))
953 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype
))) == void_type_node
)))
956 pedwarn ("%Hconflicting types for '%D'",
957 &DECL_SOURCE_LOCATION (newdecl
), newdecl
);
958 /* Make sure we keep void * as ret type, not char *. */
959 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype
))) == void_type_node
)
960 TREE_TYPE (newdecl
) = newtype
= oldtype
;
962 /* Set DECL_IN_SYSTEM_HEADER, so that if we see another declaration
963 we will come back here again. */
964 DECL_IN_SYSTEM_HEADER (newdecl
) = 1;
966 /* Permit void foo (...) to match int foo (...) if the latter is the
967 definition and implicit int was used. See c-torture/compile/920625-2.c. */
968 else if (!types_match
&& new_is_definition
969 && TREE_CODE (olddecl
) == FUNCTION_DECL
970 && TREE_CODE (newdecl
) == FUNCTION_DECL
971 && TYPE_MAIN_VARIANT (TREE_TYPE (oldtype
)) == void_type_node
972 && TYPE_MAIN_VARIANT (TREE_TYPE (newtype
)) == integer_type_node
973 && C_FUNCTION_IMPLICIT_INT (newdecl
))
975 pedwarn ("%Hconflicting types for '%D'",
976 &DECL_SOURCE_LOCATION (newdecl
), newdecl
);
977 /* Make sure we keep void as the return type. */
978 TREE_TYPE (newdecl
) = newtype
= oldtype
;
979 C_FUNCTION_IMPLICIT_INT (newdecl
) = 0;
981 else if (!types_match
982 /* Permit char *foo (int, ...); followed by char *foo ();
984 && ! (TREE_CODE (olddecl
) == FUNCTION_DECL
986 /* Return types must still match. */
987 && comptypes (TREE_TYPE (oldtype
),
988 TREE_TYPE (newtype
), comptype_flags
)
989 && TYPE_ARG_TYPES (newtype
) == 0))
991 error ("%Hconflicting types for '%D'",
992 &DECL_SOURCE_LOCATION (newdecl
), newdecl
);
993 /* Check for function type mismatch
994 involving an empty arglist vs a nonempty one. */
995 if (TREE_CODE (olddecl
) == FUNCTION_DECL
996 && comptypes (TREE_TYPE (oldtype
),
997 TREE_TYPE (newtype
), comptype_flags
)
998 && ((TYPE_ARG_TYPES (oldtype
) == 0
999 && DECL_INITIAL (olddecl
) == 0)
1001 (TYPE_ARG_TYPES (newtype
) == 0
1002 && DECL_INITIAL (newdecl
) == 0)))
1004 /* Classify the problem further. */
1005 tree t
= TYPE_ARG_TYPES (oldtype
);
1007 t
= TYPE_ARG_TYPES (newtype
);
1008 for (; t
; t
= TREE_CHAIN (t
))
1010 tree type
= TREE_VALUE (t
);
1012 if (TREE_CHAIN (t
) == 0
1013 && TYPE_MAIN_VARIANT (type
) != void_type_node
)
1015 error ("a parameter list with an ellipsis can't match an empty parameter name list declaration");
1019 if (c_type_promotes_to (type
) != type
)
1021 error ("an argument type that has a default promotion can't match an empty parameter name list declaration");
1026 if (C_DECL_IMPLICIT (olddecl
))
1027 error ("%Hprevious implicit declaration of '%D'",
1028 &DECL_SOURCE_LOCATION (olddecl
), olddecl
);
1030 error ("%Hprevious declaration of '%D'",
1031 &DECL_SOURCE_LOCATION (olddecl
), olddecl
);
1033 /* This is safer because the initializer might contain references
1034 to variables that were declared between olddecl and newdecl. This
1035 will make the initializer invalid for olddecl in case it gets
1036 assigned to olddecl below. */
1037 if (TREE_CODE (newdecl
) == VAR_DECL
)
1038 DECL_INITIAL (newdecl
) = 0;
1040 /* TLS cannot follow non-TLS declaration. */
1041 else if (TREE_CODE (olddecl
) == VAR_DECL
&& TREE_CODE (newdecl
) == VAR_DECL
1042 && !DECL_THREAD_LOCAL (olddecl
) && DECL_THREAD_LOCAL (newdecl
))
1044 error ("%Hthread-local declaration of '%D' follows non thread-local "
1045 "declaration", &DECL_SOURCE_LOCATION (newdecl
), newdecl
);
1046 error ("%Hprevious declaration of '%D'",
1047 &DECL_SOURCE_LOCATION (olddecl
), olddecl
);
1049 /* non-TLS declaration cannot follow TLS declaration. */
1050 else if (TREE_CODE (olddecl
) == VAR_DECL
&& TREE_CODE (newdecl
) == VAR_DECL
1051 && DECL_THREAD_LOCAL (olddecl
) && !DECL_THREAD_LOCAL (newdecl
))
1053 error ("%Hnon thread-local declaration of '%D' follows "
1054 "thread-local declaration",
1055 &DECL_SOURCE_LOCATION (newdecl
), newdecl
);
1056 error ("%Hprevious declaration of '%D'",
1057 &DECL_SOURCE_LOCATION (olddecl
), olddecl
);
1061 errmsg
= redeclaration_error_message (newdecl
, olddecl
);
1064 const location_t
*locus
= &DECL_SOURCE_LOCATION (newdecl
);
1068 error ("%Hredefinition of '%D'", locus
, newdecl
);
1071 error ("%Hredeclaration of '%D'", locus
, newdecl
);
1074 error ("%Hconflicting declarations of '%D'", locus
, newdecl
);
1080 locus
= &DECL_SOURCE_LOCATION (olddecl
);
1081 if (DECL_INITIAL (olddecl
)
1082 && current_scope
== global_scope
)
1083 error ("%H'%D' previously defined here", locus
, olddecl
);
1085 error ("%H'%D' previously declared here", locus
, olddecl
);
1088 else if (TREE_CODE (newdecl
) == TYPE_DECL
1089 && (DECL_IN_SYSTEM_HEADER (olddecl
)
1090 || DECL_IN_SYSTEM_HEADER (newdecl
)))
1092 const location_t
*locus
= &DECL_SOURCE_LOCATION (newdecl
);
1093 warning ("%Hredefinition of '%D'", locus
, newdecl
);
1094 locus
= &DECL_SOURCE_LOCATION (olddecl
);
1095 if (DECL_INITIAL (olddecl
)
1096 && current_scope
== global_scope
)
1097 warning ("%H'%D' previously defined here", locus
, olddecl
);
1099 warning ("%H'%D' previously declared here", locus
, olddecl
);
1101 else if (TREE_CODE (olddecl
) == FUNCTION_DECL
1102 && DECL_INITIAL (olddecl
) != 0
1103 && TYPE_ARG_TYPES (oldtype
) == 0
1104 && TYPE_ARG_TYPES (newtype
) != 0
1105 && TYPE_ACTUAL_ARG_TYPES (oldtype
) != 0)
1109 /* Prototype decl follows defn w/o prototype. */
1111 for (parm
= TYPE_ACTUAL_ARG_TYPES (oldtype
),
1112 type
= TYPE_ARG_TYPES (newtype
),
1115 parm
= TREE_CHAIN (parm
), type
= TREE_CHAIN (type
), nargs
++)
1117 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm
)) == void_type_node
1118 && TYPE_MAIN_VARIANT (TREE_VALUE (type
)) == void_type_node
)
1120 const location_t
*locus
= &DECL_SOURCE_LOCATION (newdecl
);
1121 warning ("%Hprototype for '%D' follows", locus
, newdecl
);
1122 locus
= &DECL_SOURCE_LOCATION (olddecl
);
1123 warning ("%Hnon-prototype definition here", locus
);
1126 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm
)) == void_type_node
1127 || TYPE_MAIN_VARIANT (TREE_VALUE (type
)) == void_type_node
)
1129 const location_t
*locus
= &DECL_SOURCE_LOCATION (newdecl
);
1130 error ("%Hprototype for '%D' follows and number of "
1131 "arguments doesn't match", locus
, newdecl
);
1132 locus
= &DECL_SOURCE_LOCATION (olddecl
);
1133 error ("%Hnon-prototype definition here", locus
);
1137 /* Type for passing arg must be consistent
1138 with that declared for the arg. */
1139 if (! comptypes (TREE_VALUE (parm
), TREE_VALUE (type
),
1142 const location_t
*locus
= &DECL_SOURCE_LOCATION (newdecl
);
1143 error ("%Hprototype for '%D' follows and argument %d "
1144 "doesn't match", locus
, newdecl
, nargs
);
1145 locus
= &DECL_SOURCE_LOCATION (olddecl
);
1146 error ("%Hnon-prototype definition here", locus
);
1152 /* Warn about mismatches in various flags. */
1155 const location_t
*locus
= &DECL_SOURCE_LOCATION (newdecl
);
1157 /* Warn if function is now inline
1158 but was previously declared not inline and has been called. */
1159 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1160 && ! DECL_DECLARED_INLINE_P (olddecl
)
1161 && DECL_DECLARED_INLINE_P (newdecl
)
1162 && TREE_USED (olddecl
))
1163 warning ("%H'%D' declared inline after being called",
1165 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1166 && ! DECL_DECLARED_INLINE_P (olddecl
)
1167 && DECL_DECLARED_INLINE_P (newdecl
)
1168 && DECL_INITIAL (olddecl
) != 0)
1169 warning ("%H'%D' declared inline after its definition",
1172 /* If pedantic, warn when static declaration follows a non-static
1173 declaration. Otherwise, do so only for functions. */
1174 if ((pedantic
|| TREE_CODE (olddecl
) == FUNCTION_DECL
)
1175 && TREE_PUBLIC (olddecl
)
1176 && !TREE_PUBLIC (newdecl
))
1177 warning ("%Hstatic declaration for '%D' follows non-static",
1180 /* If warn_traditional, warn when a non-static function
1181 declaration follows a static one. */
1182 if (warn_traditional
&& !in_system_header
1183 && TREE_CODE (olddecl
) == FUNCTION_DECL
1184 && !TREE_PUBLIC (olddecl
)
1185 && TREE_PUBLIC (newdecl
))
1186 warning ("%Hnon-static declaration for '%D' follows static",
1189 /* Warn when const declaration follows a non-const
1190 declaration, but not for functions. */
1191 if (TREE_CODE (olddecl
) != FUNCTION_DECL
1192 && !TREE_READONLY (olddecl
)
1193 && TREE_READONLY (newdecl
))
1194 warning ("%Hconst declaration for '%D' follows non-const",
1196 /* These bits are logically part of the type, for variables.
1197 But not for functions
1198 (where qualifiers are not valid ANSI anyway). */
1199 else if (pedantic
&& TREE_CODE (olddecl
) != FUNCTION_DECL
1200 && (TREE_READONLY (newdecl
) != TREE_READONLY (olddecl
)
1201 || TREE_THIS_VOLATILE (newdecl
) != TREE_THIS_VOLATILE (olddecl
)))
1202 pedwarn ("%Htype qualifiers for '%D' conflict with previous "
1203 "declaration", locus
, newdecl
);
1207 /* Optionally warn about more than one declaration for the same name. */
1208 if (errmsg
== 0 && warn_redundant_decls
&& DECL_SOURCE_LINE (olddecl
) != 0
1209 /* Don't warn about a function declaration
1210 followed by a definition. */
1211 && !(TREE_CODE (newdecl
) == FUNCTION_DECL
&& DECL_INITIAL (newdecl
) != 0
1212 && DECL_INITIAL (olddecl
) == 0)
1213 /* Don't warn about extern decl followed by (tentative) definition. */
1214 && !(DECL_EXTERNAL (olddecl
) && ! DECL_EXTERNAL (newdecl
)))
1216 warning ("%Hredundant redeclaration of '%D' in same scope",
1217 &DECL_SOURCE_LOCATION (newdecl
), newdecl
);
1218 warning ("%Hprevious declaration of '%D'",
1219 &DECL_SOURCE_LOCATION (olddecl
), olddecl
);
1222 /* Copy all the DECL_... slots specified in the new decl
1223 except for any that we copy here from the old type.
1225 Past this point, we don't change OLDTYPE and NEWTYPE
1226 even if we change the types of NEWDECL and OLDDECL. */
1230 /* When copying info to olddecl, we store into write_olddecl
1231 instead. This allows us to avoid modifying olddecl when
1232 different_binding_level is true. */
1233 tree write_olddecl
= different_binding_level
? newdecl
: olddecl
;
1235 /* Merge the data types specified in the two decls. */
1236 if (TREE_CODE (newdecl
) != FUNCTION_DECL
|| !DECL_BUILT_IN (olddecl
))
1238 if (different_binding_level
)
1240 if (TYPE_ARG_TYPES (oldtype
) != 0
1241 && TYPE_ARG_TYPES (newtype
) == 0)
1242 TREE_TYPE (newdecl
) = common_type (newtype
, oldtype
);
1245 = build_type_attribute_variant
1247 merge_attributes (TYPE_ATTRIBUTES (newtype
),
1248 TYPE_ATTRIBUTES (oldtype
)));
1252 = TREE_TYPE (olddecl
)
1253 = common_type (newtype
, oldtype
);
1256 /* Lay the type out, unless already done. */
1257 if (oldtype
!= TREE_TYPE (newdecl
))
1259 if (TREE_TYPE (newdecl
) != error_mark_node
)
1260 layout_type (TREE_TYPE (newdecl
));
1261 if (TREE_CODE (newdecl
) != FUNCTION_DECL
1262 && TREE_CODE (newdecl
) != TYPE_DECL
1263 && TREE_CODE (newdecl
) != CONST_DECL
)
1264 layout_decl (newdecl
, 0);
1268 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1269 DECL_SIZE (newdecl
) = DECL_SIZE (olddecl
);
1270 DECL_SIZE_UNIT (newdecl
) = DECL_SIZE_UNIT (olddecl
);
1271 DECL_MODE (newdecl
) = DECL_MODE (olddecl
);
1272 if (TREE_CODE (olddecl
) != FUNCTION_DECL
)
1273 if (DECL_ALIGN (olddecl
) > DECL_ALIGN (newdecl
))
1275 DECL_ALIGN (newdecl
) = DECL_ALIGN (olddecl
);
1276 DECL_USER_ALIGN (newdecl
) |= DECL_ALIGN (olddecl
);
1280 /* Keep the old rtl since we can safely use it. */
1281 COPY_DECL_RTL (olddecl
, newdecl
);
1283 /* Merge the type qualifiers. */
1284 if (TREE_READONLY (newdecl
))
1285 TREE_READONLY (write_olddecl
) = 1;
1287 if (TREE_THIS_VOLATILE (newdecl
))
1289 TREE_THIS_VOLATILE (write_olddecl
) = 1;
1290 if (TREE_CODE (newdecl
) == VAR_DECL
1291 /* If an automatic variable is re-declared in the same
1292 function scope, but the old declaration was not
1293 volatile, make_var_volatile() would crash because the
1294 variable would have been assigned to a pseudo, not a
1295 MEM. Since this duplicate declaration is invalid
1296 anyway, we just skip the call. */
1298 make_var_volatile (newdecl
);
1301 /* Keep source location of definition rather than declaration. */
1302 /* When called with different_binding_level set, keep the old
1303 information so that meaningful diagnostics can be given. */
1304 if (DECL_INITIAL (newdecl
) == 0 && DECL_INITIAL (olddecl
) != 0
1305 && ! different_binding_level
)
1307 DECL_SOURCE_LINE (newdecl
) = DECL_SOURCE_LINE (olddecl
);
1308 DECL_SOURCE_FILE (newdecl
) = DECL_SOURCE_FILE (olddecl
);
1311 /* Merge the unused-warning information. */
1312 if (DECL_IN_SYSTEM_HEADER (olddecl
))
1313 DECL_IN_SYSTEM_HEADER (newdecl
) = 1;
1314 else if (DECL_IN_SYSTEM_HEADER (newdecl
))
1315 DECL_IN_SYSTEM_HEADER (write_olddecl
) = 1;
1317 /* Merge the initialization information. */
1318 /* When called with different_binding_level set, don't copy over
1319 DECL_INITIAL, so that we don't accidentally change function
1320 declarations into function definitions. */
1321 if (DECL_INITIAL (newdecl
) == 0 && ! different_binding_level
)
1322 DECL_INITIAL (newdecl
) = DECL_INITIAL (olddecl
);
1324 /* Merge the section attribute.
1325 We want to issue an error if the sections conflict but that must be
1326 done later in decl_attributes since we are called before attributes
1328 if (DECL_SECTION_NAME (newdecl
) == NULL_TREE
)
1329 DECL_SECTION_NAME (newdecl
) = DECL_SECTION_NAME (olddecl
);
1331 /* Copy the assembler name.
1332 Currently, it can only be defined in the prototype. */
1333 COPY_DECL_ASSEMBLER_NAME (olddecl
, newdecl
);
1335 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1337 DECL_STATIC_CONSTRUCTOR(newdecl
) |= DECL_STATIC_CONSTRUCTOR(olddecl
);
1338 DECL_STATIC_DESTRUCTOR (newdecl
) |= DECL_STATIC_DESTRUCTOR (olddecl
);
1339 DECL_NO_LIMIT_STACK (newdecl
) |= DECL_NO_LIMIT_STACK (olddecl
);
1340 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl
)
1341 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl
);
1342 TREE_THIS_VOLATILE (newdecl
) |= TREE_THIS_VOLATILE (olddecl
);
1343 TREE_READONLY (newdecl
) |= TREE_READONLY (olddecl
);
1344 DECL_IS_MALLOC (newdecl
) |= DECL_IS_MALLOC (olddecl
);
1345 DECL_IS_PURE (newdecl
) |= DECL_IS_PURE (olddecl
);
1348 /* If cannot merge, then use the new type and qualifiers,
1349 and don't preserve the old rtl. */
1350 else if (! different_binding_level
)
1352 TREE_TYPE (olddecl
) = TREE_TYPE (newdecl
);
1353 TREE_READONLY (olddecl
) = TREE_READONLY (newdecl
);
1354 TREE_THIS_VOLATILE (olddecl
) = TREE_THIS_VOLATILE (newdecl
);
1355 TREE_SIDE_EFFECTS (olddecl
) = TREE_SIDE_EFFECTS (newdecl
);
1358 /* Merge the storage class information. */
1359 merge_weak (newdecl
, olddecl
);
1361 /* For functions, static overrides non-static. */
1362 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1364 TREE_PUBLIC (newdecl
) &= TREE_PUBLIC (olddecl
);
1365 /* This is since we don't automatically
1366 copy the attributes of NEWDECL into OLDDECL. */
1367 /* No need to worry about different_binding_level here because
1368 then TREE_PUBLIC (newdecl) was true. */
1369 TREE_PUBLIC (olddecl
) = TREE_PUBLIC (newdecl
);
1370 /* If this clears `static', clear it in the identifier too. */
1371 if (! TREE_PUBLIC (olddecl
))
1372 TREE_PUBLIC (DECL_NAME (olddecl
)) = 0;
1374 if (DECL_EXTERNAL (newdecl
))
1376 if (! different_binding_level
|| different_tu
)
1378 /* Don't mess with these flags on local externs; they remain
1379 external even if there's a declaration at file scope which
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 /* If we have two non-EXTERNAL file-scope decls that are
1390 the same, only one of them should be written out. */
1392 TREE_ASM_WRITTEN (newdecl
) = 1;
1397 TREE_STATIC (olddecl
) = TREE_STATIC (newdecl
);
1398 TREE_PUBLIC (olddecl
) = TREE_PUBLIC (newdecl
);
1401 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1403 /* If we're redefining a function previously defined as extern
1404 inline, make sure we emit debug info for the inline before we
1405 throw it away, in case it was inlined into a function that hasn't
1406 been written out yet. */
1407 if (new_is_definition
&& DECL_INITIAL (olddecl
))
1409 if (TREE_USED (olddecl
))
1410 (*debug_hooks
->outlining_inline_function
) (olddecl
);
1412 /* The new defn must not be inline. */
1413 DECL_INLINE (newdecl
) = 0;
1414 DECL_UNINLINABLE (newdecl
) = 1;
1418 /* If either decl says `inline', this fn is inline,
1419 unless its definition was passed already. */
1420 if (DECL_DECLARED_INLINE_P (newdecl
)
1421 || DECL_DECLARED_INLINE_P (olddecl
))
1422 DECL_DECLARED_INLINE_P (newdecl
) = 1;
1424 DECL_UNINLINABLE (newdecl
) = DECL_UNINLINABLE (olddecl
)
1425 = (DECL_UNINLINABLE (newdecl
) || DECL_UNINLINABLE (olddecl
));
1428 if (DECL_BUILT_IN (olddecl
))
1430 /* Get rid of any built-in function if new arg types don't match it
1431 or if we have a function definition. */
1432 if (! types_match
|| new_is_definition
)
1434 if (! different_binding_level
)
1436 TREE_TYPE (olddecl
) = TREE_TYPE (newdecl
);
1437 DECL_BUILT_IN_CLASS (olddecl
) = NOT_BUILT_IN
;
1442 /* If redeclaring a builtin function, and not a definition,
1443 it stays built in. */
1444 DECL_BUILT_IN_CLASS (newdecl
) = DECL_BUILT_IN_CLASS (olddecl
);
1445 DECL_FUNCTION_CODE (newdecl
) = DECL_FUNCTION_CODE (olddecl
);
1449 /* Also preserve various other info from the definition. */
1450 if (! new_is_definition
)
1452 DECL_RESULT (newdecl
) = DECL_RESULT (olddecl
);
1453 /* When called with different_binding_level set, don't copy over
1454 DECL_INITIAL, so that we don't accidentally change function
1455 declarations into function definitions. */
1456 if (! different_binding_level
)
1457 DECL_INITIAL (newdecl
) = DECL_INITIAL (olddecl
);
1458 DECL_SAVED_INSNS (newdecl
) = DECL_SAVED_INSNS (olddecl
);
1459 DECL_SAVED_TREE (newdecl
) = DECL_SAVED_TREE (olddecl
);
1460 DECL_ESTIMATED_INSNS (newdecl
) = DECL_ESTIMATED_INSNS (olddecl
);
1461 DECL_ARGUMENTS (newdecl
) = DECL_ARGUMENTS (olddecl
);
1463 /* Set DECL_INLINE on the declaration if we've got a body
1464 from which to instantiate. */
1465 if (DECL_INLINE (olddecl
) && ! DECL_UNINLINABLE (newdecl
))
1467 DECL_INLINE (newdecl
) = 1;
1468 DECL_ABSTRACT_ORIGIN (newdecl
)
1469 = (different_binding_level
1470 ? DECL_ORIGIN (olddecl
)
1471 : DECL_ABSTRACT_ORIGIN (olddecl
));
1476 /* If a previous declaration said inline, mark the
1477 definition as inlinable. */
1478 if (DECL_DECLARED_INLINE_P (newdecl
)
1479 && ! DECL_UNINLINABLE (newdecl
))
1480 DECL_INLINE (newdecl
) = 1;
1483 if (different_binding_level
)
1486 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
1487 But preserve OLDDECL's DECL_UID. */
1489 unsigned olddecl_uid
= DECL_UID (olddecl
);
1491 memcpy ((char *) olddecl
+ sizeof (struct tree_common
),
1492 (char *) newdecl
+ sizeof (struct tree_common
),
1493 sizeof (struct tree_decl
) - sizeof (struct tree_common
));
1494 DECL_UID (olddecl
) = olddecl_uid
;
1497 /* NEWDECL contains the merged attribute lists.
1498 Update OLDDECL to be the same. */
1499 DECL_ATTRIBUTES (olddecl
) = DECL_ATTRIBUTES (newdecl
);
1501 /* If OLDDECL had its DECL_RTL instantiated, re-invoke make_decl_rtl
1502 so that encode_section_info has a chance to look at the new decl
1503 flags and attributes. */
1504 if (DECL_RTL_SET_P (olddecl
)
1505 && (TREE_CODE (olddecl
) == FUNCTION_DECL
1506 || (TREE_CODE (olddecl
) == VAR_DECL
1507 && TREE_STATIC (olddecl
))))
1508 make_decl_rtl (olddecl
, NULL
);
1513 /* Return any external DECL associated with ID, whether or not it is
1514 currently in scope. */
1517 any_external_decl (tree id
)
1519 tree decl
= IDENTIFIER_SYMBOL_VALUE (id
);
1522 if (decl
== 0 || TREE_CODE (decl
) == ERROR_MARK
)
1524 else if (TREE_CODE (decl
) != TYPE_DECL
&& DECL_EXTERNAL (decl
))
1527 t
= purpose_member (id
, truly_local_externals
);
1529 return TREE_VALUE (t
);
1534 /* Record an external decl DECL. This only does something if a
1535 shadowing decl already exists. */
1537 record_external_decl (tree decl
)
1539 tree name
= DECL_NAME (decl
);
1540 if (!IDENTIFIER_SYMBOL_VALUE (name
))
1543 truly_local_externals
= tree_cons (name
, decl
, truly_local_externals
);
1546 /* Check whether decl-node X shadows an existing declaration.
1547 OLD is the old IDENTIFIER_SYMBOL_VALUE of the DECL_NAME of X,
1548 which might be a NULL_TREE. */
1550 warn_if_shadowing (tree x
, tree old
)
1554 /* Nothing to shadow? */
1556 /* Shadow warnings not wanted? */
1558 /* No shadow warnings for internally generated vars. */
1559 || DECL_SOURCE_LINE (x
) == 0
1560 /* No shadow warnings for vars made for inlining. */
1561 || DECL_FROM_INLINE (x
)
1562 /* Don't warn about the parm names in function declarator
1563 within a function declarator.
1564 It would be nice to avoid warning in any function
1565 declarator in a declaration, as opposed to a definition,
1566 but there is no way to tell it's not a definition. */
1567 || (TREE_CODE (x
) == PARM_DECL
&& current_scope
->outer
->parm_flag
))
1570 name
= IDENTIFIER_POINTER (DECL_NAME (x
));
1571 if (TREE_CODE (old
) == PARM_DECL
)
1572 shadow_warning (SW_PARAM
, name
, old
);
1573 else if (C_DECL_FILE_SCOPE (old
))
1574 shadow_warning (SW_GLOBAL
, name
, old
);
1576 shadow_warning (SW_LOCAL
, name
, old
);
1580 /* Subroutine of pushdecl.
1582 X is a TYPE_DECL for a typedef statement. Create a brand new
1583 ..._TYPE node (which will be just a variant of the existing
1584 ..._TYPE node with identical properties) and then install X
1585 as the TYPE_NAME of this brand new (duplicate) ..._TYPE node.
1587 The whole point here is to end up with a situation where each
1588 and every ..._TYPE node the compiler creates will be uniquely
1589 associated with AT MOST one node representing a typedef name.
1590 This way, even though the compiler substitutes corresponding
1591 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
1592 early on, later parts of the compiler can always do the reverse
1593 translation and get back the corresponding typedef name. For
1596 typedef struct S MY_TYPE;
1599 Later parts of the compiler might only know that `object' was of
1600 type `struct S' if it were not for code just below. With this
1601 code however, later parts of the compiler see something like:
1603 struct S' == struct S
1604 typedef struct S' MY_TYPE;
1607 And they can then deduce (from the node for type struct S') that
1608 the original object declaration was:
1612 Being able to do this is important for proper support of protoize,
1613 and also for generating precise symbolic debugging information
1614 which takes full account of the programmer's (typedef) vocabulary.
1616 Obviously, we don't want to generate a duplicate ..._TYPE node if
1617 the TYPE_DECL node that we are now processing really represents a
1618 standard built-in type.
1620 Since all standard types are effectively declared at line zero
1621 in the source file, we can easily check to see if we are working
1622 on a standard type by checking the current value of lineno. */
1625 clone_underlying_type (tree x
)
1627 if (DECL_SOURCE_LINE (x
) == 0)
1629 if (TYPE_NAME (TREE_TYPE (x
)) == 0)
1630 TYPE_NAME (TREE_TYPE (x
)) = x
;
1632 else if (TREE_TYPE (x
) != error_mark_node
1633 && DECL_ORIGINAL_TYPE (x
) == NULL_TREE
)
1635 tree tt
= TREE_TYPE (x
);
1636 DECL_ORIGINAL_TYPE (x
) = tt
;
1637 tt
= build_type_copy (tt
);
1639 TREE_USED (tt
) = TREE_USED (x
);
1644 /* Record a decl-node X as belonging to the current lexical scope.
1645 Check for errors (such as an incompatible declaration for the same
1646 name already seen in the same scope).
1648 Returns either X or an old decl for the same name.
1649 If an old decl is returned, it may have been smashed
1650 to agree with what X says. */
1655 tree name
= DECL_NAME (x
);
1656 struct c_scope
*scope
= current_scope
;
1658 #ifdef ENABLE_CHECKING
1659 if (error_mark_node
== 0)
1660 /* Called too early. */
1664 /* Functions need the lang_decl data. */
1665 if (TREE_CODE (x
) == FUNCTION_DECL
&& ! DECL_LANG_SPECIFIC (x
))
1666 DECL_LANG_SPECIFIC (x
) = ggc_alloc_cleared (sizeof (struct lang_decl
));
1668 /* A local extern declaration for a function doesn't constitute nesting.
1669 A local auto declaration does, since it's a forward decl
1670 for a nested function coming later. */
1671 if (current_function_decl
== NULL
1672 || ((TREE_CODE (x
) == FUNCTION_DECL
|| TREE_CODE (x
) == VAR_DECL
)
1673 && DECL_INITIAL (x
) == 0 && DECL_EXTERNAL (x
)))
1674 DECL_CONTEXT (x
) = current_file_decl
;
1676 DECL_CONTEXT (x
) = current_function_decl
;
1682 if (warn_nested_externs
1683 && scope
!= global_scope
1684 && DECL_EXTERNAL (x
)
1685 && !DECL_IN_SYSTEM_HEADER (x
))
1686 warning ("nested extern declaration of `%s'",
1687 IDENTIFIER_POINTER (name
));
1689 old
= lookup_name_current_level (name
);
1690 if (old
&& duplicate_decls (x
, old
, 0, false))
1692 /* For PARM_DECLs, old may be a forward declaration.
1693 If so, we want to remove it from its old location
1694 (in the variables chain) and rechain it in the
1695 location given by the new declaration. */
1696 if (TREE_CODE (x
) == PARM_DECL
)
1699 for (p
= &scope
->names
; *p
; p
= &TREE_CHAIN (*p
))
1702 *p
= TREE_CHAIN (old
);
1703 SCOPE_LIST_APPEND (scope
, parms
, old
);
1709 if (DECL_EXTERNAL (x
) || scope
== global_scope
)
1711 /* Find and check against a previous, not-in-scope, external
1712 decl for this identifier. (C99 s???: If two declarations
1713 with external linkage, referring to the same object, have
1714 incompatible types, the behavior is undefined). */
1715 tree ext
= any_external_decl (name
);
1718 if (duplicate_decls (x
, ext
, scope
!= global_scope
,
1720 x
= copy_node (ext
);
1723 record_external_decl (x
);
1726 if (TREE_CODE (x
) == TYPE_DECL
)
1727 clone_underlying_type (x
);
1729 /* If storing a local value, there may already be one
1730 (inherited). If so, record it for restoration when this
1731 scope ends. Take care not to do this if we are replacing an
1732 older decl in the same scope (i.e. duplicate_decls returned
1734 if (scope
!= global_scope
1735 && IDENTIFIER_SYMBOL_VALUE (name
)
1736 && IDENTIFIER_SYMBOL_VALUE (name
) != old
)
1738 warn_if_shadowing (x
, IDENTIFIER_SYMBOL_VALUE (name
));
1739 scope
->shadowed
= tree_cons (name
, IDENTIFIER_SYMBOL_VALUE (name
),
1743 /* Install the new declaration in the requested scope. */
1744 IDENTIFIER_SYMBOL_VALUE (name
) = x
;
1745 C_DECL_INVISIBLE (x
) = 0;
1747 /* Keep list of variables in this scope with incomplete type.
1748 If the input is erroneous, we can have error_mark in the type
1749 slot (e.g. "f(void a, ...)") - that doesn't count as an
1752 FIXME: Chain these off the TYPE_DECL for the incomplete type,
1753 then we don't have to do (potentially quite costly) searches
1754 in finish_struct. */
1755 if (TREE_TYPE (x
) != error_mark_node
1756 && !COMPLETE_TYPE_P (TREE_TYPE (x
)))
1758 tree element
= TREE_TYPE (x
);
1760 while (TREE_CODE (element
) == ARRAY_TYPE
)
1761 element
= TREE_TYPE (element
);
1762 if (TREE_CODE (element
) == RECORD_TYPE
1763 || TREE_CODE (element
) == UNION_TYPE
)
1764 scope
->incomplete
= tree_cons (NULL_TREE
, x
, scope
->incomplete
);
1768 if (TREE_CODE (x
) == PARM_DECL
)
1769 SCOPE_LIST_APPEND (scope
, parms
, x
);
1771 SCOPE_LIST_APPEND (scope
, names
, x
);
1776 /* Record X as belonging to the global scope (C99 "file scope").
1777 This is used only internally by the Objective-C front end,
1778 and is limited to its needs. duplicate_decls is not called;
1779 if there is any preexisting decl for this identifier, it is an ICE. */
1782 pushdecl_top_level (tree x
)
1786 if (TREE_CODE (x
) != VAR_DECL
)
1789 name
= DECL_NAME (x
);
1791 if (IDENTIFIER_SYMBOL_VALUE (name
))
1794 DECL_CONTEXT (x
) = current_file_decl
;
1795 IDENTIFIER_SYMBOL_VALUE (name
) = x
;
1797 SCOPE_LIST_APPEND (global_scope
, names
, x
);
1801 /* Generate an implicit declaration for identifier FUNCTIONID as a
1802 function of type int (). */
1805 implicitly_declare (tree functionid
)
1807 tree decl
= any_external_decl (functionid
);
1811 /* Implicit declaration of a function already declared
1812 (somehow) in a different scope, or as a built-in.
1813 If this is the first time this has happened, warn;
1814 then recycle the old declaration. */
1815 if (!C_DECL_IMPLICIT (decl
))
1817 implicit_decl_warning (DECL_NAME (decl
));
1818 if (! C_DECL_FILE_SCOPE (decl
))
1819 warning ("%Hprevious declaration of '%D'",
1820 &DECL_SOURCE_LOCATION (decl
), decl
);
1821 C_DECL_IMPLICIT (decl
) = 1;
1823 /* If this function is global, then it must already be in the
1824 global scope, so there's no need to push it again. */
1825 if (current_scope
== global_scope
)
1827 /* If this is a local declaration, make a copy; we can't have
1828 the same DECL listed in two different scopes. */
1829 return pushdecl (copy_node (decl
));
1832 /* Not seen before. */
1833 decl
= build_decl (FUNCTION_DECL
, functionid
, default_function_type
);
1834 DECL_EXTERNAL (decl
) = 1;
1835 TREE_PUBLIC (decl
) = 1;
1836 C_DECL_IMPLICIT (decl
) = 1;
1837 implicit_decl_warning (functionid
);
1839 /* C89 says implicit declarations are in the innermost block.
1840 So we record the decl in the standard fashion. */
1841 decl
= pushdecl (decl
);
1843 /* No need to call objc_check_decl here - it's a function type. */
1844 rest_of_decl_compilation (decl
, NULL
, 0, 0);
1846 /* Write a record describing this implicit function declaration
1847 to the prototypes file (if requested). */
1848 gen_aux_info_record (decl
, 0, 1, 0);
1850 /* Possibly apply some default attributes to this implicit declaration. */
1851 decl_attributes (&decl
, NULL_TREE
, 0);
1857 implicit_decl_warning (tree id
)
1859 const char *name
= IDENTIFIER_POINTER (id
);
1860 if (mesg_implicit_function_declaration
== 2)
1861 error ("implicit declaration of function `%s'", name
);
1862 else if (mesg_implicit_function_declaration
== 1)
1863 warning ("implicit declaration of function `%s'", name
);
1866 /* Return zero if the declaration NEWDECL is valid
1867 when the declaration OLDDECL (assumed to be for the same name)
1868 has already been seen.
1869 Otherwise return 1 if NEWDECL is a redefinition, 2 if it is a redeclaration,
1870 and 3 if it is a conflicting declaration. */
1873 redeclaration_error_message (tree newdecl
, tree olddecl
)
1875 if (TREE_CODE (newdecl
) == TYPE_DECL
)
1877 /* Do not complain about type redeclarations where at least one
1878 declaration was in a system header. */
1879 if (DECL_IN_SYSTEM_HEADER (olddecl
) || DECL_IN_SYSTEM_HEADER (newdecl
))
1883 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1885 /* Declarations of functions can insist on internal linkage
1886 but they can't be inconsistent with internal linkage,
1887 so there can be no error on that account.
1888 However defining the same name twice is no good. */
1889 if (DECL_INITIAL (olddecl
) != 0 && DECL_INITIAL (newdecl
) != 0
1890 /* However, defining once as extern inline and a second
1891 time in another way is ok. */
1892 && ! (DECL_DECLARED_INLINE_P (olddecl
) && DECL_EXTERNAL (olddecl
)
1893 && ! (DECL_DECLARED_INLINE_P (newdecl
)
1894 && DECL_EXTERNAL (newdecl
))))
1898 else if (C_DECL_FILE_SCOPE (newdecl
))
1900 /* Objects declared at file scope: */
1901 /* If at least one is a reference, it's ok. */
1902 if (DECL_EXTERNAL (newdecl
) || DECL_EXTERNAL (olddecl
))
1904 /* Reject two definitions. */
1905 if (DECL_INITIAL (olddecl
) != 0 && DECL_INITIAL (newdecl
) != 0)
1907 /* Now we have two tentative defs, or one tentative and one real def. */
1908 /* Insist that the linkage match. */
1909 if (TREE_PUBLIC (olddecl
) != TREE_PUBLIC (newdecl
))
1913 else if (current_scope
->parm_flag
1914 && TREE_ASM_WRITTEN (olddecl
) && !TREE_ASM_WRITTEN (newdecl
))
1918 /* Newdecl has block scope. If olddecl has block scope also, then
1919 reject two definitions, and reject a definition together with an
1920 external reference. Otherwise, it is OK, because newdecl must
1921 be an extern reference to olddecl. */
1922 if (!(DECL_EXTERNAL (newdecl
) && DECL_EXTERNAL (olddecl
))
1923 && DECL_CONTEXT (newdecl
) == DECL_CONTEXT (olddecl
))
1929 /* Issue an error message for a reference to an undeclared variable
1930 ID, including a reference to a builtin outside of function-call
1931 context. Establish a binding of the identifier to error_mark_node
1932 in an appropriate scope, which will suppress further errors for the
1935 undeclared_variable (tree id
)
1937 static bool already
= false;
1938 struct c_scope
*scope
;
1940 if (current_function_decl
== 0)
1942 error ("`%s' undeclared here (not in a function)",
1943 IDENTIFIER_POINTER (id
));
1944 scope
= current_scope
;
1948 error ("`%s' undeclared (first use in this function)",
1949 IDENTIFIER_POINTER (id
));
1953 error ("(Each undeclared identifier is reported only once");
1954 error ("for each function it appears in.)");
1958 scope
= current_function_scope
;
1961 scope
->shadowed
= tree_cons (id
, IDENTIFIER_SYMBOL_VALUE (id
),
1963 IDENTIFIER_SYMBOL_VALUE (id
) = error_mark_node
;
1966 /* Subroutine of lookup_label, declare_label, define_label: construct a
1967 LABEL_DECL with all the proper frills. */
1970 make_label (tree name
, location_t location
)
1972 tree label
= build_decl (LABEL_DECL
, name
, void_type_node
);
1974 DECL_CONTEXT (label
) = current_function_decl
;
1975 DECL_MODE (label
) = VOIDmode
;
1976 DECL_SOURCE_LOCATION (label
) = location
;
1981 /* Another subroutine of lookup_label, declare_label, define_label:
1982 set up the binding of name to LABEL_DECL in the given SCOPE. */
1985 bind_label (tree name
, tree label
, struct c_scope
*scope
)
1987 if (IDENTIFIER_LABEL_VALUE (name
))
1988 scope
->shadowed
= tree_cons (name
, IDENTIFIER_LABEL_VALUE (name
),
1990 IDENTIFIER_LABEL_VALUE (name
) = label
;
1992 SCOPE_LIST_APPEND (scope
, names
, label
);
1995 /* Get the LABEL_DECL corresponding to identifier NAME as a label.
1996 Create one if none exists so far for the current function.
1997 This is called when a label is used in a goto expression or
1998 has its address taken. */
2001 lookup_label (tree name
)
2005 if (current_function_decl
== 0)
2007 error ("label %s referenced outside of any function",
2008 IDENTIFIER_POINTER (name
));
2012 /* Use a label already defined or ref'd with this name, but not if
2013 it is inherited from a containing function and wasn't declared
2015 label
= IDENTIFIER_LABEL_VALUE (name
);
2016 if (label
&& (DECL_CONTEXT (label
) == current_function_decl
2017 || C_DECLARED_LABEL_FLAG (label
)))
2019 /* If the label has only been declared, update its apparent
2020 location to point here, for better diagnostics if it
2021 turns out not to have been defined. */
2022 if (!TREE_USED (label
))
2023 DECL_SOURCE_LOCATION (label
) = input_location
;
2027 /* No label binding for that identifier; make one. */
2028 label
= make_label (name
, input_location
);
2030 /* Ordinary labels go in the current function scope. */
2031 bind_label (name
, label
, current_function_scope
);
2035 /* Make a label named NAME in the current function, shadowing silently
2036 any that may be inherited from containing functions or containing
2037 scopes. This is called for __label__ declarations. */
2039 /* Note that valid use, if the label being shadowed comes from another
2040 scope in the same function, requires calling declare_nonlocal_label
2041 right away. (Is this still true? -zw 2003-07-17) */
2044 declare_label (tree name
)
2046 tree label
= IDENTIFIER_LABEL_VALUE (name
);
2049 /* Check to make sure that the label hasn't already been declared
2051 for (dup
= current_scope
->names
; dup
; dup
= TREE_CHAIN (dup
))
2054 error ("duplicate label declaration `%s'", IDENTIFIER_POINTER (name
));
2055 error ("%Hthis is a previous declaration",
2056 &DECL_SOURCE_LOCATION (dup
));
2058 /* Just use the previous declaration. */
2062 label
= make_label (name
, input_location
);
2063 C_DECLARED_LABEL_FLAG (label
) = 1;
2065 /* Declared labels go in the current scope. */
2066 bind_label (name
, label
, current_scope
);
2070 /* Define a label, specifying the location in the source file.
2071 Return the LABEL_DECL node for the label, if the definition is valid.
2072 Otherwise return 0. */
2075 define_label (location_t location
, tree name
)
2079 /* Find any preexisting label with this name. It is an error
2080 if that label has already been defined in this function, or
2081 if there is a containing function with a declared label with
2083 label
= IDENTIFIER_LABEL_VALUE (name
);
2086 && ((DECL_CONTEXT (label
) == current_function_decl
2087 && DECL_INITIAL (label
) != 0)
2088 || (DECL_CONTEXT (label
) != current_function_decl
2089 && C_DECLARED_LABEL_FLAG (label
))))
2091 location_t
*prev_loc
= &DECL_SOURCE_LOCATION (label
);
2092 error ("%Hduplicate label `%D'", &location
, label
);
2093 if (DECL_INITIAL (label
))
2094 error ("%H`%D' previously defined here", prev_loc
, label
);
2096 error ("%H`%D' previously declared here", prev_loc
, label
);
2099 else if (label
&& DECL_CONTEXT (label
) == current_function_decl
)
2101 /* The label has been used or declared already in this function,
2102 but not defined. Update its location to point to this
2104 DECL_SOURCE_LOCATION (label
) = location
;
2108 /* No label binding for that identifier; make one. */
2109 label
= make_label (name
, location
);
2111 /* Ordinary labels go in the current function scope. */
2112 bind_label (name
, label
, current_function_scope
);
2115 if (warn_traditional
&& !in_system_header
&& lookup_name (name
))
2116 warning ("%Htraditional C lacks a separate namespace for labels, "
2117 "identifier `%s' conflicts", &location
,
2118 IDENTIFIER_POINTER (name
));
2120 /* Mark label as having been defined. */
2121 DECL_INITIAL (label
) = error_mark_node
;
2125 /* Return the list of declarations of the current scope. */
2130 return current_scope
->names
;
2134 /* Given NAME, an IDENTIFIER_NODE,
2135 return the structure (or union or enum) definition for that name.
2136 If THISLEVEL_ONLY is nonzero, searches only the current_scope.
2137 CODE says which kind of type the caller wants;
2138 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2139 If the wrong kind of type is found, an error is reported. */
2142 lookup_tag (enum tree_code code
, tree name
, int thislevel_only
)
2144 tree tag
= IDENTIFIER_TAG_VALUE (name
);
2150 /* We only care about whether it's in this level if
2151 thislevel_only was set or it might be a type clash. */
2152 if (thislevel_only
|| TREE_CODE (tag
) != code
)
2154 if (current_scope
== global_scope
2155 || purpose_member (name
, current_scope
->tags
))
2159 if (thislevel_only
&& !thislevel
)
2162 if (TREE_CODE (tag
) != code
)
2164 /* Definition isn't the kind we were looking for. */
2165 pending_invalid_xref
= name
;
2166 pending_invalid_xref_location
= input_location
;
2168 /* If in the same binding level as a declaration as a tag
2169 of a different type, this must not be allowed to
2170 shadow that tag, so give the error immediately.
2171 (For example, "struct foo; union foo;" is invalid.) */
2173 pending_xref_error ();
2178 /* Print an error message now
2179 for a recent invalid struct, union or enum cross reference.
2180 We don't print them immediately because they are not invalid
2181 when used in the `struct foo;' construct for shadowing. */
2184 pending_xref_error (void)
2186 if (pending_invalid_xref
!= 0)
2187 error ("%H`%s' defined as wrong kind of tag",
2188 &pending_invalid_xref_location
,
2189 IDENTIFIER_POINTER (pending_invalid_xref
));
2190 pending_invalid_xref
= 0;
2194 /* Look up NAME in the current scope and its superiors
2195 in the namespace of variables, functions and typedefs.
2196 Return a ..._DECL node of some kind representing its definition,
2197 or return 0 if it is undefined. */
2200 lookup_name (tree name
)
2202 tree decl
= IDENTIFIER_SYMBOL_VALUE (name
);
2203 if (decl
== 0 || decl
== error_mark_node
)
2205 if (C_DECL_INVISIBLE (decl
))
2210 /* Similar to `lookup_name' but look only at the current scope. */
2213 lookup_name_current_level (tree name
)
2215 tree decl
= IDENTIFIER_SYMBOL_VALUE (name
);
2217 if (decl
== 0 || decl
== error_mark_node
|| C_DECL_INVISIBLE (decl
))
2220 if (current_scope
== global_scope
)
2223 /* Scan the current scope for a decl with name NAME.
2224 For PARM_DECLs, we have to look at both ->parms and ->names, since
2225 forward parameter declarations wind up on the ->names list. */
2226 if (TREE_CODE (decl
) == PARM_DECL
2227 && chain_member (decl
, current_scope
->parms
))
2229 if (chain_member (decl
, current_scope
->names
))
2235 /* Create the predefined scalar types of C,
2236 and some nodes representing standard constants (0, 1, (void *) 0).
2237 Initialize the global scope.
2238 Make definitions for built-in primitive functions. */
2241 c_init_decl_processing (void)
2244 tree ptr_ftype_void
, ptr_ftype_ptr
;
2245 location_t save_loc
= input_location
;
2247 /* Adds some ggc roots, and reserved words for c-parse.in. */
2250 current_function_decl
= 0;
2252 /* Make the c_scope structure for global names. */
2254 global_scope
= current_scope
;
2256 /* Declarations from c_common_nodes_and_builtins must not be associated
2257 with this input file, lest we get differences between using and not
2258 using preprocessed headers. */
2259 input_location
.file
= "<internal>";
2260 input_location
.line
= 0;
2262 /* Make the DECL for the toplevel file scope. */
2263 current_file_decl
= build_decl (TRANSLATION_UNIT_DECL
, NULL
, NULL
);
2265 build_common_tree_nodes (flag_signed_char
);
2267 c_common_nodes_and_builtins ();
2269 /* In C, comparisons and TRUTH_* expressions have type int. */
2270 truthvalue_type_node
= integer_type_node
;
2271 truthvalue_true_node
= integer_one_node
;
2272 truthvalue_false_node
= integer_zero_node
;
2274 /* Even in C99, which has a real boolean type. */
2275 pushdecl (build_decl (TYPE_DECL
, get_identifier ("_Bool"),
2276 boolean_type_node
));
2278 endlink
= void_list_node
;
2279 ptr_ftype_void
= build_function_type (ptr_type_node
, endlink
);
2281 = build_function_type (ptr_type_node
,
2282 tree_cons (NULL_TREE
, ptr_type_node
, endlink
));
2284 input_location
= save_loc
;
2286 pedantic_lvalues
= pedantic
;
2288 make_fname_decl
= c_make_fname_decl
;
2289 start_fname_decls ();
2291 builtin_decls
= global_scope
->names
;
2294 /* Create the VAR_DECL for __FUNCTION__ etc. ID is the name to give the
2295 decl, NAME is the initialization string and TYPE_DEP indicates whether
2296 NAME depended on the type of the function. As we don't yet implement
2297 delayed emission of static data, we mark the decl as emitted
2298 so it is not placed in the output. Anything using it must therefore pull
2299 out the STRING_CST initializer directly. FIXME. */
2302 c_make_fname_decl (tree id
, int type_dep
)
2304 const char *name
= fname_as_string (type_dep
);
2305 tree decl
, type
, init
;
2306 size_t length
= strlen (name
);
2308 type
= build_array_type
2309 (build_qualified_type (char_type_node
, TYPE_QUAL_CONST
),
2310 build_index_type (size_int (length
)));
2312 decl
= build_decl (VAR_DECL
, id
, type
);
2314 TREE_STATIC (decl
) = 1;
2315 TREE_READONLY (decl
) = 1;
2316 DECL_ARTIFICIAL (decl
) = 1;
2318 init
= build_string (length
+ 1, name
);
2319 TREE_TYPE (init
) = type
;
2320 DECL_INITIAL (decl
) = init
;
2322 TREE_USED (decl
) = 1;
2324 if (current_function_decl
)
2326 DECL_CONTEXT (decl
) = current_function_decl
;
2327 IDENTIFIER_SYMBOL_VALUE (id
) = decl
;
2328 SCOPE_LIST_APPEND (current_function_scope
, names
, decl
);
2331 finish_decl (decl
, init
, NULL_TREE
);
2336 /* Return a definition for a builtin function named NAME and whose data type
2337 is TYPE. TYPE should be a function type with argument types.
2338 FUNCTION_CODE tells later passes how to compile calls to this function.
2339 See tree.h for its possible values.
2341 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
2342 the name to be called if we can't opencode the function. If
2343 ATTRS is nonzero, use that for the function's attribute list. */
2346 builtin_function (const char *name
, tree type
, int function_code
,
2347 enum built_in_class
class, const char *library_name
,
2350 tree decl
= build_decl (FUNCTION_DECL
, get_identifier (name
), type
);
2351 DECL_EXTERNAL (decl
) = 1;
2352 TREE_PUBLIC (decl
) = 1;
2354 SET_DECL_ASSEMBLER_NAME (decl
, get_identifier (library_name
));
2355 make_decl_rtl (decl
, NULL
);
2357 DECL_BUILT_IN_CLASS (decl
) = class;
2358 DECL_FUNCTION_CODE (decl
) = function_code
;
2360 /* Warn if a function in the namespace for users
2361 is used without an occasion to consider it declared. */
2362 if (name
[0] != '_' || name
[1] != '_')
2363 C_DECL_INVISIBLE (decl
) = 1;
2365 /* Possibly apply some default attributes to this built-in function. */
2367 decl_attributes (&decl
, attrs
, ATTR_FLAG_BUILT_IN
);
2369 decl_attributes (&decl
, NULL_TREE
, 0);
2374 /* Apply default attributes to a function, if a system function with default
2378 c_insert_default_attributes (tree decl
)
2380 if (!TREE_PUBLIC (decl
))
2382 c_common_insert_default_attributes (decl
);
2385 /* Called when a declaration is seen that contains no names to declare.
2386 If its type is a reference to a structure, union or enum inherited
2387 from a containing scope, shadow that tag name for the current scope
2388 with a forward reference.
2389 If its type defines a new named structure or union
2390 or defines an enum, it is valid but we need not do anything here.
2391 Otherwise, it is an error. */
2394 shadow_tag (tree declspecs
)
2396 shadow_tag_warned (declspecs
, 0);
2400 shadow_tag_warned (tree declspecs
, int warned
)
2403 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
2410 pending_invalid_xref
= 0;
2412 /* Remove the attributes from declspecs, since they will confuse the
2414 split_specs_attrs (declspecs
, &specs
, &attrs
);
2416 for (link
= specs
; link
; link
= TREE_CHAIN (link
))
2418 tree value
= TREE_VALUE (link
);
2419 enum tree_code code
= TREE_CODE (value
);
2421 if (code
== RECORD_TYPE
|| code
== UNION_TYPE
|| code
== ENUMERAL_TYPE
)
2422 /* Used to test also that TYPE_SIZE (value) != 0.
2423 That caused warning for `struct foo;' at top level in the file. */
2425 tree name
= TYPE_NAME (value
);
2432 if (warned
!= 1 && code
!= ENUMERAL_TYPE
)
2433 /* Empty unnamed enum OK */
2435 pedwarn ("unnamed struct/union that defines no instances");
2441 t
= lookup_tag (code
, name
, 1);
2445 t
= make_node (code
);
2452 if (!warned
&& ! in_system_header
)
2454 warning ("useless keyword or type name in empty declaration");
2461 error ("two types specified in one empty declaration");
2466 pedwarn ("empty declaration");
2470 /* Construct an array declarator. EXPR is the expression inside [], or
2471 NULL_TREE. QUALS are the type qualifiers inside the [] (to be applied
2472 to the pointer to which a parameter array is converted). STATIC_P is
2473 nonzero if "static" is inside the [], zero otherwise. VLA_UNSPEC_P
2474 is nonzero is the array is [*], a VLA of unspecified length which is
2475 nevertheless a complete type (not currently implemented by GCC),
2476 zero otherwise. The declarator is constructed as an ARRAY_REF
2477 (to be decoded by grokdeclarator), whose operand 0 is what's on the
2478 left of the [] (filled by in set_array_declarator_type) and operand 1
2479 is the expression inside; whose TREE_TYPE is the type qualifiers and
2480 which has TREE_STATIC set if "static" is used. */
2483 build_array_declarator (tree expr
, tree quals
, int static_p
, int vla_unspec_p
)
2486 decl
= build_nt (ARRAY_REF
, NULL_TREE
, expr
);
2487 TREE_TYPE (decl
) = quals
;
2488 TREE_STATIC (decl
) = (static_p
? 1 : 0);
2489 if (pedantic
&& !flag_isoc99
)
2491 if (static_p
|| quals
!= NULL_TREE
)
2492 pedwarn ("ISO C90 does not support `static' or type qualifiers in parameter array declarators");
2494 pedwarn ("ISO C90 does not support `[*]' array declarators");
2497 warning ("GCC does not yet properly implement `[*]' array declarators");
2501 /* Set the type of an array declarator. DECL is the declarator, as
2502 constructed by build_array_declarator; TYPE is what appears on the left
2503 of the [] and goes in operand 0. ABSTRACT_P is nonzero if it is an
2504 abstract declarator, zero otherwise; this is used to reject static and
2505 type qualifiers in abstract declarators, where they are not in the
2509 set_array_declarator_type (tree decl
, tree type
, int abstract_p
)
2511 TREE_OPERAND (decl
, 0) = type
;
2512 if (abstract_p
&& (TREE_TYPE (decl
) != NULL_TREE
|| TREE_STATIC (decl
)))
2513 error ("static or type qualifiers in abstract declarator");
2517 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
2520 groktypename (tree typename
)
2524 if (TREE_CODE (typename
) != TREE_LIST
)
2527 split_specs_attrs (TREE_PURPOSE (typename
), &specs
, &attrs
);
2529 typename
= grokdeclarator (TREE_VALUE (typename
), specs
, TYPENAME
, 0);
2531 /* Apply attributes. */
2532 decl_attributes (&typename
, attrs
, 0);
2537 /* Return a PARM_DECL node for a given pair of specs and declarator. */
2540 groktypename_in_parm_context (tree typename
)
2542 if (TREE_CODE (typename
) != TREE_LIST
)
2544 return grokdeclarator (TREE_VALUE (typename
),
2545 TREE_PURPOSE (typename
),
2549 /* Decode a declarator in an ordinary declaration or data definition.
2550 This is called as soon as the type information and variable name
2551 have been parsed, before parsing the initializer if any.
2552 Here we create the ..._DECL node, fill in its type,
2553 and put it on the list of decls for the current context.
2554 The ..._DECL node is returned as the value.
2556 Exception: for arrays where the length is not specified,
2557 the type is left null, to be filled in by `finish_decl'.
2559 Function definitions do not come here; they go to start_function
2560 instead. However, external and forward declarations of functions
2561 do go through here. Structure field declarations are done by
2562 grokfield and not through here. */
2565 start_decl (tree declarator
, tree declspecs
, int initialized
, tree attributes
)
2570 /* An object declared as __attribute__((deprecated)) suppresses
2571 warnings of uses of other deprecated items. */
2572 if (lookup_attribute ("deprecated", attributes
))
2573 deprecated_state
= DEPRECATED_SUPPRESS
;
2575 decl
= grokdeclarator (declarator
, declspecs
,
2576 NORMAL
, initialized
);
2578 deprecated_state
= DEPRECATED_NORMAL
;
2580 if (warn_main
> 0 && TREE_CODE (decl
) != FUNCTION_DECL
2581 && MAIN_NAME_P (DECL_NAME (decl
)))
2582 warning ("%H'%D' is usually a function",
2583 &DECL_SOURCE_LOCATION (decl
), decl
);
2586 /* Is it valid for this decl to have an initializer at all?
2587 If not, set INITIALIZED to zero, which will indirectly
2588 tell `finish_decl' to ignore the initializer once it is parsed. */
2589 switch (TREE_CODE (decl
))
2592 error ("typedef `%s' is initialized (use __typeof__ instead)",
2593 IDENTIFIER_POINTER (DECL_NAME (decl
)));
2598 error ("function `%s' is initialized like a variable",
2599 IDENTIFIER_POINTER (DECL_NAME (decl
)));
2604 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
2605 error ("parameter `%s' is initialized",
2606 IDENTIFIER_POINTER (DECL_NAME (decl
)));
2611 /* Don't allow initializations for incomplete types
2612 except for arrays which might be completed by the initialization. */
2614 /* This can happen if the array size is an undefined macro. We already
2615 gave a warning, so we don't need another one. */
2616 if (TREE_TYPE (decl
) == error_mark_node
)
2618 else if (COMPLETE_TYPE_P (TREE_TYPE (decl
)))
2620 /* A complete type is ok if size is fixed. */
2622 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl
))) != INTEGER_CST
2623 || C_DECL_VARIABLE_SIZE (decl
))
2625 error ("variable-sized object may not be initialized");
2629 else if (TREE_CODE (TREE_TYPE (decl
)) != ARRAY_TYPE
)
2631 error ("variable `%s' has initializer but incomplete type",
2632 IDENTIFIER_POINTER (DECL_NAME (decl
)));
2635 else if (!COMPLETE_TYPE_P (TREE_TYPE (TREE_TYPE (decl
))))
2637 error ("elements of array `%s' have incomplete type",
2638 IDENTIFIER_POINTER (DECL_NAME (decl
)));
2645 DECL_EXTERNAL (decl
) = 0;
2646 if (current_scope
== global_scope
)
2647 TREE_STATIC (decl
) = 1;
2649 /* Tell `pushdecl' this is an initialized decl
2650 even though we don't yet have the initializer expression.
2651 Also tell `finish_decl' it may store the real initializer. */
2652 DECL_INITIAL (decl
) = error_mark_node
;
2655 /* If this is a function declaration, write a record describing it to the
2656 prototypes file (if requested). */
2658 if (TREE_CODE (decl
) == FUNCTION_DECL
)
2659 gen_aux_info_record (decl
, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl
)) != 0);
2661 /* ANSI specifies that a tentative definition which is not merged with
2662 a non-tentative definition behaves exactly like a definition with an
2663 initializer equal to zero. (Section 3.7.2)
2665 -fno-common gives strict ANSI behavior, though this tends to break
2666 a large body of code that grew up without this rule.
2668 Thread-local variables are never common, since there's no entrenched
2669 body of code to break, and it allows more efficient variable references
2670 in the presence of dynamic linking. */
2672 if (TREE_CODE (decl
) == VAR_DECL
2674 && TREE_PUBLIC (decl
)
2675 && !DECL_THREAD_LOCAL (decl
)
2677 DECL_COMMON (decl
) = 1;
2679 /* Set attributes here so if duplicate decl, will have proper attributes. */
2680 decl_attributes (&decl
, attributes
, 0);
2682 if (TREE_CODE (decl
) == FUNCTION_DECL
2683 && DECL_DECLARED_INLINE_P (decl
)
2684 && DECL_UNINLINABLE (decl
)
2685 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl
)))
2686 warning ("%Hinline function '%D' given attribute noinline",
2687 &DECL_SOURCE_LOCATION (decl
), decl
);
2689 /* Add this decl to the current scope.
2690 TEM may equal DECL or it may be a previous decl of the same name. */
2691 tem
= pushdecl (decl
);
2693 /* For a local variable, define the RTL now. */
2694 if (current_scope
!= global_scope
2695 /* But not if this is a duplicate decl
2696 and we preserved the rtl from the previous one
2697 (which may or may not happen). */
2698 && !DECL_RTL_SET_P (tem
)
2699 && C_DECL_FILE_SCOPE (tem
))
2701 if (TREE_TYPE (tem
) != error_mark_node
2702 && (COMPLETE_TYPE_P (TREE_TYPE (tem
))
2703 || (TREE_CODE (TREE_TYPE (tem
)) == ARRAY_TYPE
2704 && DECL_INITIAL (tem
) != 0)))
2711 /* Finish processing of a declaration;
2712 install its initial value.
2713 If the length of an array type is not known before,
2714 it must be determined now, from the initial value, or it is an error. */
2717 finish_decl (tree decl
, tree init
, tree asmspec_tree
)
2719 tree type
= TREE_TYPE (decl
);
2720 int was_incomplete
= (DECL_SIZE (decl
) == 0);
2721 const char *asmspec
= 0;
2723 /* If a name was specified, get the string. */
2724 if (current_scope
== global_scope
)
2725 asmspec_tree
= maybe_apply_renaming_pragma (decl
, asmspec_tree
);
2727 asmspec
= TREE_STRING_POINTER (asmspec_tree
);
2729 /* If `start_decl' didn't like having an initialization, ignore it now. */
2730 if (init
!= 0 && DECL_INITIAL (decl
) == 0)
2733 /* Don't crash if parm is initialized. */
2734 if (TREE_CODE (decl
) == PARM_DECL
)
2738 store_init_value (decl
, init
);
2740 /* Deduce size of array from initialization, if not already known */
2741 if (TREE_CODE (type
) == ARRAY_TYPE
2742 && TYPE_DOMAIN (type
) == 0
2743 && TREE_CODE (decl
) != TYPE_DECL
)
2746 = (TREE_STATIC (decl
)
2747 /* Even if pedantic, an external linkage array
2748 may have incomplete type at first. */
2749 ? pedantic
&& !TREE_PUBLIC (decl
)
2750 : !DECL_EXTERNAL (decl
));
2752 = complete_array_type (type
, DECL_INITIAL (decl
), do_default
);
2754 /* Get the completed type made by complete_array_type. */
2755 type
= TREE_TYPE (decl
);
2758 error ("%Hinitializer fails to determine size of '%D'",
2759 &DECL_SOURCE_LOCATION (decl
), decl
);
2761 else if (failure
== 2)
2764 error ("%Harray size missing in '%D'",
2765 &DECL_SOURCE_LOCATION (decl
), decl
);
2766 /* If a `static' var's size isn't known,
2767 make it extern as well as static, so it does not get
2769 If it is not `static', then do not mark extern;
2770 finish_incomplete_decl will give it a default size
2771 and it will get allocated. */
2772 else if (!pedantic
&& TREE_STATIC (decl
) && ! TREE_PUBLIC (decl
))
2773 DECL_EXTERNAL (decl
) = 1;
2776 /* TYPE_MAX_VALUE is always one less than the number of elements
2777 in the array, because we start counting at zero. Therefore,
2778 warn only if the value is less than zero. */
2779 else if (pedantic
&& TYPE_DOMAIN (type
) != 0
2780 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type
))) < 0)
2781 error ("%Hzero or negative size array '%D'",
2782 &DECL_SOURCE_LOCATION (decl
), decl
);
2784 layout_decl (decl
, 0);
2787 if (TREE_CODE (decl
) == VAR_DECL
)
2789 if (DECL_SIZE (decl
) == 0 && TREE_TYPE (decl
) != error_mark_node
2790 && COMPLETE_TYPE_P (TREE_TYPE (decl
)))
2791 layout_decl (decl
, 0);
2793 if (DECL_SIZE (decl
) == 0
2794 /* Don't give an error if we already gave one earlier. */
2795 && TREE_TYPE (decl
) != error_mark_node
2796 && (TREE_STATIC (decl
)
2798 /* A static variable with an incomplete type
2799 is an error if it is initialized.
2800 Also if it is not file scope.
2801 Otherwise, let it through, but if it is not `extern'
2802 then it may cause an error message later. */
2803 (DECL_INITIAL (decl
) != 0
2804 || !C_DECL_FILE_SCOPE (decl
))
2806 /* An automatic variable with an incomplete type
2808 !DECL_EXTERNAL (decl
)))
2810 error ("%Hstorage size of '%D' isn't known",
2811 &DECL_SOURCE_LOCATION (decl
), decl
);
2812 TREE_TYPE (decl
) = error_mark_node
;
2815 if ((DECL_EXTERNAL (decl
) || TREE_STATIC (decl
))
2816 && DECL_SIZE (decl
) != 0)
2818 if (TREE_CODE (DECL_SIZE (decl
)) == INTEGER_CST
)
2819 constant_expression_warning (DECL_SIZE (decl
));
2821 error ("%Hstorage size of '%D' isn't constant",
2822 &DECL_SOURCE_LOCATION (decl
), decl
);
2825 if (TREE_USED (type
))
2826 TREE_USED (decl
) = 1;
2829 /* If this is a function and an assembler name is specified, reset DECL_RTL
2830 so we can give it its new name. Also, update built_in_decls if it
2831 was a normal built-in. */
2832 if (TREE_CODE (decl
) == FUNCTION_DECL
&& asmspec
)
2834 /* ASMSPEC is given, and not the name of a register. Mark the
2835 name with a star so assemble_name won't munge it. */
2836 char *starred
= alloca (strlen (asmspec
) + 2);
2838 strcpy (starred
+ 1, asmspec
);
2840 if (DECL_BUILT_IN_CLASS (decl
) == BUILT_IN_NORMAL
)
2842 tree builtin
= built_in_decls
[DECL_FUNCTION_CODE (decl
)];
2843 SET_DECL_RTL (builtin
, NULL_RTX
);
2844 SET_DECL_ASSEMBLER_NAME (builtin
, get_identifier (starred
));
2845 #ifdef TARGET_MEM_FUNCTIONS
2846 if (DECL_FUNCTION_CODE (decl
) == BUILT_IN_MEMCPY
)
2847 init_block_move_fn (starred
);
2848 else if (DECL_FUNCTION_CODE (decl
) == BUILT_IN_MEMSET
)
2849 init_block_clear_fn (starred
);
2851 if (DECL_FUNCTION_CODE (decl
) == BUILT_IN_BCOPY
)
2852 init_block_move_fn (starred
);
2853 else if (DECL_FUNCTION_CODE (decl
) == BUILT_IN_BZERO
)
2854 init_block_clear_fn (starred
);
2857 SET_DECL_RTL (decl
, NULL_RTX
);
2858 SET_DECL_ASSEMBLER_NAME (decl
, get_identifier (starred
));
2861 /* If #pragma weak was used, mark the decl weak now. */
2862 if (current_scope
== global_scope
)
2863 maybe_apply_pragma_weak (decl
);
2865 /* Output the assembler code and/or RTL code for variables and functions,
2866 unless the type is an undefined structure or union.
2867 If not, it will get done when the type is completed. */
2869 if (TREE_CODE (decl
) == VAR_DECL
|| TREE_CODE (decl
) == FUNCTION_DECL
)
2871 /* This is a no-op in c-lang.c or something real in objc-act.c. */
2872 if (c_dialect_objc ())
2873 objc_check_decl (decl
);
2875 if (C_DECL_FILE_SCOPE (decl
))
2877 if (DECL_INITIAL (decl
) == NULL_TREE
2878 || DECL_INITIAL (decl
) == error_mark_node
)
2879 /* Don't output anything
2880 when a tentative file-scope definition is seen.
2881 But at end of compilation, do output code for them. */
2882 DECL_DEFER_OUTPUT (decl
) = 1;
2883 rest_of_decl_compilation (decl
, asmspec
, true, 0);
2887 /* This is a local variable. If there is an ASMSPEC, the
2888 user has requested that we handle it specially. */
2891 /* In conjunction with an ASMSPEC, the `register'
2892 keyword indicates that we should place the variable
2893 in a particular register. */
2894 if (DECL_REGISTER (decl
))
2895 DECL_C_HARD_REGISTER (decl
) = 1;
2897 /* If this is not a static variable, issue a warning.
2898 It doesn't make any sense to give an ASMSPEC for an
2899 ordinary, non-register local variable. Historically,
2900 GCC has accepted -- but ignored -- the ASMSPEC in
2902 if (TREE_CODE (decl
) == VAR_DECL
2903 && !DECL_REGISTER (decl
)
2904 && !TREE_STATIC (decl
))
2905 warning ("%Hignoring asm-specifier for non-static local "
2906 "variable '%D'", &DECL_SOURCE_LOCATION (decl
), decl
);
2908 SET_DECL_ASSEMBLER_NAME (decl
, get_identifier (asmspec
));
2911 if (TREE_CODE (decl
) != FUNCTION_DECL
)
2912 add_decl_stmt (decl
);
2915 if (!C_DECL_FILE_SCOPE (decl
))
2917 /* Recompute the RTL of a local array now
2918 if it used to be an incomplete type. */
2920 && ! TREE_STATIC (decl
) && ! DECL_EXTERNAL (decl
))
2922 /* If we used it already as memory, it must stay in memory. */
2923 TREE_ADDRESSABLE (decl
) = TREE_USED (decl
);
2924 /* If it's still incomplete now, no init will save it. */
2925 if (DECL_SIZE (decl
) == 0)
2926 DECL_INITIAL (decl
) = 0;
2931 /* If this was marked 'used', be sure it will be output. */
2932 if (lookup_attribute ("used", DECL_ATTRIBUTES (decl
)))
2933 mark_referenced (DECL_ASSEMBLER_NAME (decl
));
2935 if (TREE_CODE (decl
) == TYPE_DECL
)
2937 /* This is a no-op in c-lang.c or something real in objc-act.c. */
2938 if (c_dialect_objc ())
2939 objc_check_decl (decl
);
2940 rest_of_decl_compilation (decl
, NULL
, C_DECL_FILE_SCOPE (decl
), 0);
2943 /* At the end of a declaration, throw away any variable type sizes
2944 of types defined inside that declaration. There is no use
2945 computing them in the following function definition. */
2946 if (current_scope
== global_scope
)
2947 get_pending_sizes ();
2949 /* Install a cleanup (aka destructor) if one was given. */
2950 if (TREE_CODE (decl
) == VAR_DECL
&& !TREE_STATIC (decl
))
2952 tree attr
= lookup_attribute ("cleanup", DECL_ATTRIBUTES (decl
));
2955 static bool eh_initialized_p
;
2957 tree cleanup_id
= TREE_VALUE (TREE_VALUE (attr
));
2958 tree cleanup_decl
= lookup_name (cleanup_id
);
2961 /* Build "cleanup(&decl)" for the destructor. */
2962 cleanup
= build_unary_op (ADDR_EXPR
, decl
, 0);
2963 cleanup
= build_tree_list (NULL_TREE
, cleanup
);
2964 cleanup
= build_function_call (cleanup_decl
, cleanup
);
2966 /* Don't warn about decl unused; the cleanup uses it. */
2967 TREE_USED (decl
) = 1;
2969 /* Initialize EH, if we've been told to do so. */
2970 if (flag_exceptions
&& !eh_initialized_p
)
2972 eh_initialized_p
= true;
2973 eh_personality_libfunc
2974 = init_one_libfunc (USING_SJLJ_EXCEPTIONS
2975 ? "__gcc_personality_sj0"
2976 : "__gcc_personality_v0");
2977 using_eh_for_cleanups ();
2980 add_stmt (build_stmt (CLEANUP_STMT
, decl
, cleanup
));
2985 /* Given a parsed parameter declaration, decode it into a PARM_DECL
2986 and push that on the current scope. */
2989 push_parm_decl (tree parm
)
2993 /* Don't attempt to expand sizes while parsing this decl.
2994 (We can get here with i_s_e 1 somehow from Objective-C.) */
2995 int save_immediate_size_expand
= immediate_size_expand
;
2996 immediate_size_expand
= 0;
2998 decl
= grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm
)),
2999 TREE_PURPOSE (TREE_PURPOSE (parm
)), PARM
, 0);
3000 decl_attributes (&decl
, TREE_VALUE (parm
), 0);
3002 decl
= pushdecl (decl
);
3004 finish_decl (decl
, NULL_TREE
, NULL_TREE
);
3006 immediate_size_expand
= save_immediate_size_expand
;
3009 /* Mark all the parameter declarations to date as forward decls,
3010 shift them to the variables list, and reset the parameters list.
3011 Also diagnose use of this extension. */
3014 mark_forward_parm_decls (void)
3018 if (pedantic
&& !current_scope
->warned_forward_parm_decls
)
3020 pedwarn ("ISO C forbids forward parameter declarations");
3021 current_scope
->warned_forward_parm_decls
= true;
3024 for (parm
= current_scope
->parms
; parm
; parm
= TREE_CHAIN (parm
))
3025 TREE_ASM_WRITTEN (parm
) = 1;
3027 SCOPE_LIST_CONCAT (current_scope
, names
, current_scope
, parms
);
3028 current_scope
->parms
= 0;
3029 current_scope
->parms_last
= 0;
3032 static GTY(()) int compound_literal_number
;
3034 /* Build a COMPOUND_LITERAL_EXPR. TYPE is the type given in the compound
3035 literal, which may be an incomplete array type completed by the
3036 initializer; INIT is a CONSTRUCTOR that initializes the compound
3040 build_compound_literal (tree type
, tree init
)
3042 /* We do not use start_decl here because we have a type, not a declarator;
3043 and do not use finish_decl because the decl should be stored inside
3044 the COMPOUND_LITERAL_EXPR rather than added elsewhere as a DECL_STMT. */
3045 tree decl
= build_decl (VAR_DECL
, NULL_TREE
, type
);
3048 DECL_EXTERNAL (decl
) = 0;
3049 TREE_PUBLIC (decl
) = 0;
3050 TREE_STATIC (decl
) = (current_scope
== global_scope
);
3051 DECL_CONTEXT (decl
) = current_function_decl
;
3052 TREE_USED (decl
) = 1;
3053 TREE_TYPE (decl
) = type
;
3054 TREE_READONLY (decl
) = TREE_READONLY (type
);
3055 store_init_value (decl
, init
);
3057 if (TREE_CODE (type
) == ARRAY_TYPE
&& !COMPLETE_TYPE_P (type
))
3059 int failure
= complete_array_type (type
, DECL_INITIAL (decl
), 1);
3064 type
= TREE_TYPE (decl
);
3065 if (type
== error_mark_node
|| !COMPLETE_TYPE_P (type
))
3066 return error_mark_node
;
3068 stmt
= build_stmt (DECL_STMT
, decl
);
3069 complit
= build1 (COMPOUND_LITERAL_EXPR
, TREE_TYPE (decl
), stmt
);
3070 TREE_SIDE_EFFECTS (complit
) = 1;
3072 layout_decl (decl
, 0);
3074 if (TREE_STATIC (decl
))
3076 /* This decl needs a name for the assembler output. We also need
3077 a unique suffix to be added to the name. */
3080 ASM_FORMAT_PRIVATE_NAME (name
, "__compound_literal",
3081 compound_literal_number
);
3082 compound_literal_number
++;
3083 DECL_NAME (decl
) = get_identifier (name
);
3084 DECL_DEFER_OUTPUT (decl
) = 1;
3085 DECL_COMDAT (decl
) = 1;
3086 DECL_ARTIFICIAL (decl
) = 1;
3088 rest_of_decl_compilation (decl
, NULL
, 1, 0);
3094 /* Make TYPE a complete type based on INITIAL_VALUE.
3095 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3096 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3099 complete_array_type (tree type
, tree initial_value
, int do_default
)
3101 tree maxindex
= NULL_TREE
;
3106 /* Note MAXINDEX is really the maximum index,
3107 one less than the size. */
3108 if (TREE_CODE (initial_value
) == STRING_CST
)
3111 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value
)));
3112 maxindex
= build_int_2 ((TREE_STRING_LENGTH (initial_value
)
3115 else if (TREE_CODE (initial_value
) == CONSTRUCTOR
)
3117 tree elts
= CONSTRUCTOR_ELTS (initial_value
);
3118 maxindex
= build_int_2 (-1, -1);
3119 for (; elts
; elts
= TREE_CHAIN (elts
))
3121 if (TREE_PURPOSE (elts
))
3122 maxindex
= TREE_PURPOSE (elts
);
3124 maxindex
= fold (build (PLUS_EXPR
, integer_type_node
,
3125 maxindex
, integer_one_node
));
3127 maxindex
= copy_node (maxindex
);
3131 /* Make an error message unless that happened already. */
3132 if (initial_value
!= error_mark_node
)
3135 /* Prevent further error messages. */
3136 maxindex
= build_int_2 (0, 0);
3143 maxindex
= build_int_2 (0, 0);
3149 TYPE_DOMAIN (type
) = build_index_type (maxindex
);
3150 if (!TREE_TYPE (maxindex
))
3151 TREE_TYPE (maxindex
) = TYPE_DOMAIN (type
);
3154 /* Lay out the type now that we can get the real answer. */
3161 /* Determine whether TYPE is a structure with a flexible array member,
3162 or a union containing such a structure (possibly recursively). */
3165 flexible_array_type_p (tree type
)
3168 switch (TREE_CODE (type
))
3171 x
= TYPE_FIELDS (type
);
3174 while (TREE_CHAIN (x
) != NULL_TREE
)
3176 if (TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
3177 && TYPE_SIZE (TREE_TYPE (x
)) == NULL_TREE
3178 && TYPE_DOMAIN (TREE_TYPE (x
)) != NULL_TREE
3179 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x
))) == NULL_TREE
)
3183 for (x
= TYPE_FIELDS (type
); x
!= NULL_TREE
; x
= TREE_CHAIN (x
))
3185 if (flexible_array_type_p (TREE_TYPE (x
)))
3194 /* Given declspecs and a declarator,
3195 determine the name and type of the object declared
3196 and construct a ..._DECL node for it.
3197 (In one case we can return a ..._TYPE node instead.
3198 For invalid input we sometimes return 0.)
3200 DECLSPECS is a chain of tree_list nodes whose value fields
3201 are the storage classes and type specifiers.
3203 DECL_CONTEXT says which syntactic context this declaration is in:
3204 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
3205 FUNCDEF for a function definition. Like NORMAL but a few different
3206 error messages in each case. Return value may be zero meaning
3207 this definition is too screwy to try to parse.
3208 PARM for a parameter declaration (either within a function prototype
3209 or before a function body). Make a PARM_DECL, or return void_type_node.
3210 TYPENAME if for a typename (in a cast or sizeof).
3211 Don't make a DECL node; just return the ..._TYPE node.
3212 FIELD for a struct or union field; make a FIELD_DECL.
3213 BITFIELD for a field with specified width.
3214 INITIALIZED is 1 if the decl has an initializer.
3216 In the TYPENAME case, DECLARATOR is really an absolute declarator.
3217 It may also be so in the PARM case, for a prototype where the
3218 argument type is specified but not the name.
3220 This function is where the complicated C meanings of `static'
3221 and `extern' are interpreted. */
3224 grokdeclarator (tree declarator
, tree declspecs
,
3225 enum decl_context decl_context
, int initialized
)
3229 tree type
= NULL_TREE
;
3234 int type_quals
= TYPE_UNQUALIFIED
;
3236 int explicit_int
= 0;
3237 int explicit_char
= 0;
3238 int defaulted_int
= 0;
3239 tree typedef_decl
= 0;
3241 tree typedef_type
= 0;
3242 int funcdef_flag
= 0;
3243 enum tree_code innermost_code
= ERROR_MARK
;
3245 int size_varies
= 0;
3246 tree decl_attr
= NULL_TREE
;
3247 tree array_ptr_quals
= NULL_TREE
;
3248 int array_parm_static
= 0;
3249 tree returned_attrs
= NULL_TREE
;
3251 if (decl_context
== BITFIELD
)
3252 bitfield
= 1, decl_context
= FIELD
;
3254 if (decl_context
== FUNCDEF
)
3255 funcdef_flag
= 1, decl_context
= NORMAL
;
3257 /* Look inside a declarator for the name being declared
3258 and get it as a string, for an error message. */
3260 tree decl
= declarator
;
3264 switch (TREE_CODE (decl
))
3269 innermost_code
= TREE_CODE (decl
);
3270 decl
= TREE_OPERAND (decl
, 0);
3274 decl
= TREE_VALUE (decl
);
3277 case IDENTIFIER_NODE
:
3278 name
= IDENTIFIER_POINTER (decl
);
3289 /* A function definition's declarator must have the form of
3290 a function declarator. */
3292 if (funcdef_flag
&& innermost_code
!= CALL_EXPR
)
3295 /* If this looks like a function definition, make it one,
3296 even if it occurs where parms are expected.
3297 Then store_parm_decls will reject it and not use it as a parm. */
3298 if (decl_context
== NORMAL
&& !funcdef_flag
3299 && current_scope
->parm_flag
)
3300 decl_context
= PARM
;
3302 /* Look through the decl specs and record which ones appear.
3303 Some typespecs are defined as built-in typenames.
3304 Others, the ones that are modifiers of other types,
3305 are represented by bits in SPECBITS: set the bits for
3306 the modifiers that appear. Storage class keywords are also in SPECBITS.
3308 If there is a typedef name or a type, store the type in TYPE.
3309 This includes builtin typedefs such as `int'.
3311 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
3312 and did not come from a user typedef.
3314 Set LONGLONG if `long' is mentioned twice. */
3316 for (spec
= declspecs
; spec
; spec
= TREE_CHAIN (spec
))
3318 tree id
= TREE_VALUE (spec
);
3320 /* If the entire declaration is itself tagged as deprecated then
3321 suppress reports of deprecated items. */
3322 if (id
&& TREE_DEPRECATED (id
))
3324 if (deprecated_state
!= DEPRECATED_SUPPRESS
)
3325 warn_deprecated_use (id
);
3328 if (id
== ridpointers
[(int) RID_INT
])
3330 if (id
== ridpointers
[(int) RID_CHAR
])
3333 if (TREE_CODE (id
) == IDENTIFIER_NODE
&& C_IS_RESERVED_WORD (id
))
3335 enum rid i
= C_RID_CODE (id
);
3336 if ((int) i
<= (int) RID_LAST_MODIFIER
)
3338 if (i
== RID_LONG
&& (specbits
& (1 << (int) RID_LONG
)))
3341 error ("`long long long' is too long for GCC");
3344 if (pedantic
&& !flag_isoc99
&& ! in_system_header
3346 pedwarn ("ISO C90 does not support `long long'");
3350 else if (specbits
& (1 << (int) i
))
3352 if (i
== RID_CONST
|| i
== RID_VOLATILE
|| i
== RID_RESTRICT
)
3355 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id
));
3358 error ("duplicate `%s'", IDENTIFIER_POINTER (id
));
3361 /* Diagnose "__thread extern". Recall that this list
3362 is in the reverse order seen in the text. */
3364 && (specbits
& (1 << (int) RID_EXTERN
3365 | 1 << (int) RID_STATIC
)))
3367 if (specbits
& 1 << (int) RID_EXTERN
)
3368 error ("`__thread' before `extern'");
3370 error ("`__thread' before `static'");
3373 specbits
|= 1 << (int) i
;
3378 error ("two or more data types in declaration of `%s'", name
);
3379 /* Actual typedefs come to us as TYPE_DECL nodes. */
3380 else if (TREE_CODE (id
) == TYPE_DECL
)
3382 if (TREE_TYPE (id
) == error_mark_node
)
3383 ; /* Allow the type to default to int to avoid cascading errors. */
3386 type
= TREE_TYPE (id
);
3387 decl_attr
= DECL_ATTRIBUTES (id
);
3391 /* Built-in types come as identifiers. */
3392 else if (TREE_CODE (id
) == IDENTIFIER_NODE
)
3394 tree t
= lookup_name (id
);
3395 if (TREE_TYPE (t
) == error_mark_node
)
3397 else if (!t
|| TREE_CODE (t
) != TYPE_DECL
)
3398 error ("`%s' fails to be a typedef or built in type",
3399 IDENTIFIER_POINTER (id
));
3402 type
= TREE_TYPE (t
);
3406 else if (TREE_CODE (id
) != ERROR_MARK
)
3413 typedef_type
= type
;
3415 size_varies
= C_TYPE_VARIABLE_SIZE (type
);
3417 /* No type at all: default to `int', and set DEFAULTED_INT
3418 because it was not a user-defined typedef. */
3422 if ((! (specbits
& ((1 << (int) RID_LONG
) | (1 << (int) RID_SHORT
)
3423 | (1 << (int) RID_SIGNED
)
3424 | (1 << (int) RID_UNSIGNED
)
3425 | (1 << (int) RID_COMPLEX
))))
3426 /* Don't warn about typedef foo = bar. */
3427 && ! (specbits
& (1 << (int) RID_TYPEDEF
) && initialized
)
3428 && ! in_system_header
)
3430 /* Issue a warning if this is an ISO C 99 program or if -Wreturn-type
3431 and this is a function, or if -Wimplicit; prefer the former
3432 warning since it is more explicit. */
3433 if ((warn_implicit_int
|| warn_return_type
|| flag_isoc99
)
3435 warn_about_return_type
= 1;
3436 else if (warn_implicit_int
|| flag_isoc99
)
3437 pedwarn_c99 ("type defaults to `int' in declaration of `%s'",
3442 type
= integer_type_node
;
3445 /* Now process the modifiers that were specified
3446 and check for invalid combinations. */
3448 /* Long double is a special combination. */
3450 if ((specbits
& 1 << (int) RID_LONG
) && ! longlong
3451 && TYPE_MAIN_VARIANT (type
) == double_type_node
)
3453 specbits
&= ~(1 << (int) RID_LONG
);
3454 type
= long_double_type_node
;
3457 /* Check all other uses of type modifiers. */
3459 if (specbits
& ((1 << (int) RID_LONG
) | (1 << (int) RID_SHORT
)
3460 | (1 << (int) RID_UNSIGNED
) | (1 << (int) RID_SIGNED
)))
3464 if ((specbits
& 1 << (int) RID_LONG
)
3465 && (specbits
& 1 << (int) RID_SHORT
))
3466 error ("both long and short specified for `%s'", name
);
3467 else if (((specbits
& 1 << (int) RID_LONG
)
3468 || (specbits
& 1 << (int) RID_SHORT
))
3470 error ("long or short specified with char for `%s'", name
);
3471 else if (((specbits
& 1 << (int) RID_LONG
)
3472 || (specbits
& 1 << (int) RID_SHORT
))
3473 && TREE_CODE (type
) == REAL_TYPE
)
3475 static int already
= 0;
3477 error ("long or short specified with floating type for `%s'", name
);
3478 if (! already
&& ! pedantic
)
3480 error ("the only valid combination is `long double'");
3484 else if ((specbits
& 1 << (int) RID_SIGNED
)
3485 && (specbits
& 1 << (int) RID_UNSIGNED
))
3486 error ("both signed and unsigned specified for `%s'", name
);
3487 else if (TREE_CODE (type
) != INTEGER_TYPE
)
3488 error ("long, short, signed or unsigned invalid for `%s'", name
);
3492 if (!explicit_int
&& !defaulted_int
&& !explicit_char
)
3494 error ("long, short, signed or unsigned used invalidly for `%s'",
3500 /* Discard the type modifiers if they are invalid. */
3503 specbits
&= ~((1 << (int) RID_LONG
) | (1 << (int) RID_SHORT
)
3504 | (1 << (int) RID_UNSIGNED
) | (1 << (int) RID_SIGNED
));
3509 if ((specbits
& (1 << (int) RID_COMPLEX
))
3510 && TREE_CODE (type
) != INTEGER_TYPE
&& TREE_CODE (type
) != REAL_TYPE
)
3512 error ("complex invalid for `%s'", name
);
3513 specbits
&= ~(1 << (int) RID_COMPLEX
);
3516 /* Decide whether an integer type is signed or not.
3517 Optionally treat bitfields as signed by default. */
3518 if (specbits
& 1 << (int) RID_UNSIGNED
3519 || (bitfield
&& ! flag_signed_bitfields
3520 && (explicit_int
|| defaulted_int
|| explicit_char
3521 /* A typedef for plain `int' without `signed'
3522 can be controlled just like plain `int'. */
3523 || ! (typedef_decl
!= 0
3524 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl
)))
3525 && TREE_CODE (type
) != ENUMERAL_TYPE
3526 && !(specbits
& 1 << (int) RID_SIGNED
)))
3529 type
= long_long_unsigned_type_node
;
3530 else if (specbits
& 1 << (int) RID_LONG
)
3531 type
= long_unsigned_type_node
;
3532 else if (specbits
& 1 << (int) RID_SHORT
)
3533 type
= short_unsigned_type_node
;
3534 else if (type
== char_type_node
)
3535 type
= unsigned_char_type_node
;
3536 else if (typedef_decl
)
3537 type
= c_common_unsigned_type (type
);
3539 type
= unsigned_type_node
;
3541 else if ((specbits
& 1 << (int) RID_SIGNED
)
3542 && type
== char_type_node
)
3543 type
= signed_char_type_node
;
3545 type
= long_long_integer_type_node
;
3546 else if (specbits
& 1 << (int) RID_LONG
)
3547 type
= long_integer_type_node
;
3548 else if (specbits
& 1 << (int) RID_SHORT
)
3549 type
= short_integer_type_node
;
3551 if (specbits
& 1 << (int) RID_COMPLEX
)
3553 if (pedantic
&& !flag_isoc99
)
3554 pedwarn ("ISO C90 does not support complex types");
3555 /* If we just have "complex", it is equivalent to
3556 "complex double", but if any modifiers at all are specified it is
3557 the complex form of TYPE. E.g, "complex short" is
3558 "complex short int". */
3560 if (defaulted_int
&& ! longlong
3561 && ! (specbits
& ((1 << (int) RID_LONG
) | (1 << (int) RID_SHORT
)
3562 | (1 << (int) RID_SIGNED
)
3563 | (1 << (int) RID_UNSIGNED
))))
3566 pedwarn ("ISO C does not support plain `complex' meaning `double complex'");
3567 type
= complex_double_type_node
;
3569 else if (type
== integer_type_node
)
3572 pedwarn ("ISO C does not support complex integer types");
3573 type
= complex_integer_type_node
;
3575 else if (type
== float_type_node
)
3576 type
= complex_float_type_node
;
3577 else if (type
== double_type_node
)
3578 type
= complex_double_type_node
;
3579 else if (type
== long_double_type_node
)
3580 type
= complex_long_double_type_node
;
3584 pedwarn ("ISO C does not support complex integer types");
3585 type
= build_complex_type (type
);
3589 /* Figure out the type qualifiers for the declaration. There are
3590 two ways a declaration can become qualified. One is something
3591 like `const int i' where the `const' is explicit. Another is
3592 something like `typedef const int CI; CI i' where the type of the
3593 declaration contains the `const'. */
3594 constp
= !! (specbits
& 1 << (int) RID_CONST
) + TYPE_READONLY (type
);
3595 restrictp
= !! (specbits
& 1 << (int) RID_RESTRICT
) + TYPE_RESTRICT (type
);
3596 volatilep
= !! (specbits
& 1 << (int) RID_VOLATILE
) + TYPE_VOLATILE (type
);
3597 inlinep
= !! (specbits
& (1 << (int) RID_INLINE
));
3598 if (constp
> 1 && ! flag_isoc99
)
3599 pedwarn ("duplicate `const'");
3600 if (restrictp
> 1 && ! flag_isoc99
)
3601 pedwarn ("duplicate `restrict'");
3602 if (volatilep
> 1 && ! flag_isoc99
)
3603 pedwarn ("duplicate `volatile'");
3604 if (! flag_gen_aux_info
&& (TYPE_QUALS (type
)))
3605 type
= TYPE_MAIN_VARIANT (type
);
3606 type_quals
= ((constp
? TYPE_QUAL_CONST
: 0)
3607 | (restrictp
? TYPE_QUAL_RESTRICT
: 0)
3608 | (volatilep
? TYPE_QUAL_VOLATILE
: 0));
3610 /* Warn if two storage classes are given. Default to `auto'. */
3615 if (specbits
& 1 << (int) RID_AUTO
) nclasses
++;
3616 if (specbits
& 1 << (int) RID_STATIC
) nclasses
++;
3617 if (specbits
& 1 << (int) RID_EXTERN
) nclasses
++;
3618 if (specbits
& 1 << (int) RID_REGISTER
) nclasses
++;
3619 if (specbits
& 1 << (int) RID_TYPEDEF
) nclasses
++;
3621 /* "static __thread" and "extern __thread" are allowed. */
3622 if ((specbits
& (1 << (int) RID_THREAD
3623 | 1 << (int) RID_STATIC
3624 | 1 << (int) RID_EXTERN
)) == (1 << (int) RID_THREAD
))
3627 /* Warn about storage classes that are invalid for certain
3628 kinds of declarations (parameters, typenames, etc.). */
3631 error ("multiple storage classes in declaration of `%s'", name
);
3632 else if (funcdef_flag
3634 & ((1 << (int) RID_REGISTER
)
3635 | (1 << (int) RID_AUTO
)
3636 | (1 << (int) RID_TYPEDEF
)
3637 | (1 << (int) RID_THREAD
))))
3639 if (specbits
& 1 << (int) RID_AUTO
3640 && (pedantic
|| current_scope
== global_scope
))
3641 pedwarn ("function definition declared `auto'");
3642 if (specbits
& 1 << (int) RID_REGISTER
)
3643 error ("function definition declared `register'");
3644 if (specbits
& 1 << (int) RID_TYPEDEF
)
3645 error ("function definition declared `typedef'");
3646 if (specbits
& 1 << (int) RID_THREAD
)
3647 error ("function definition declared `__thread'");
3648 specbits
&= ~((1 << (int) RID_TYPEDEF
) | (1 << (int) RID_REGISTER
)
3649 | (1 << (int) RID_AUTO
) | (1 << (int) RID_THREAD
));
3651 else if (decl_context
!= NORMAL
&& nclasses
> 0)
3653 if (decl_context
== PARM
&& specbits
& 1 << (int) RID_REGISTER
)
3657 switch (decl_context
)
3660 error ("storage class specified for structure field `%s'",
3664 error ("storage class specified for parameter `%s'", name
);
3667 error ("storage class specified for typename");
3670 specbits
&= ~((1 << (int) RID_TYPEDEF
) | (1 << (int) RID_REGISTER
)
3671 | (1 << (int) RID_AUTO
) | (1 << (int) RID_STATIC
)
3672 | (1 << (int) RID_EXTERN
) | (1 << (int) RID_THREAD
));
3675 else if (specbits
& 1 << (int) RID_EXTERN
&& initialized
&& ! funcdef_flag
)
3677 /* `extern' with initialization is invalid if not at file scope. */
3678 if (current_scope
== global_scope
)
3679 warning ("`%s' initialized and declared `extern'", name
);
3681 error ("`%s' has both `extern' and initializer", name
);
3683 else if (current_scope
== global_scope
)
3685 if (specbits
& 1 << (int) RID_AUTO
)
3686 error ("file-scope declaration of `%s' specifies `auto'", name
);
3690 if (specbits
& 1 << (int) RID_EXTERN
&& funcdef_flag
)
3691 error ("nested function `%s' declared `extern'", name
);
3692 else if ((specbits
& (1 << (int) RID_THREAD
3693 | 1 << (int) RID_EXTERN
3694 | 1 << (int) RID_STATIC
))
3695 == (1 << (int) RID_THREAD
))
3697 error ("function-scope `%s' implicitly auto and declared `__thread'",
3699 specbits
&= ~(1 << (int) RID_THREAD
);
3704 /* Now figure out the structure of the declarator proper.
3705 Descend through it, creating more complex types, until we reach
3706 the declared identifier (or NULL_TREE, in an absolute declarator). */
3708 while (declarator
&& TREE_CODE (declarator
) != IDENTIFIER_NODE
)
3710 if (type
== error_mark_node
)
3712 declarator
= TREE_OPERAND (declarator
, 0);
3716 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
3717 an INDIRECT_REF (for *...),
3718 a CALL_EXPR (for ...(...)),
3719 a TREE_LIST (for nested attributes),
3720 an identifier (for the name being declared)
3721 or a null pointer (for the place in an absolute declarator
3722 where the name was omitted).
3723 For the last two cases, we have just exited the loop.
3725 At this point, TYPE is the type of elements of an array,
3726 or for a function to return, or for a pointer to point to.
3727 After this sequence of ifs, TYPE is the type of the
3728 array or function or pointer, and DECLARATOR has had its
3729 outermost layer removed. */
3731 if (array_ptr_quals
!= NULL_TREE
|| array_parm_static
)
3733 /* Only the innermost declarator (making a parameter be of
3734 array type which is converted to pointer type)
3735 may have static or type qualifiers. */
3736 error ("static or type qualifiers in non-parameter array declarator");
3737 array_ptr_quals
= NULL_TREE
;
3738 array_parm_static
= 0;
3741 if (TREE_CODE (declarator
) == TREE_LIST
)
3743 /* We encode a declarator with embedded attributes using
3745 tree attrs
= TREE_PURPOSE (declarator
);
3748 declarator
= TREE_VALUE (declarator
);
3749 inner_decl
= declarator
;
3750 while (inner_decl
!= NULL_TREE
3751 && TREE_CODE (inner_decl
) == TREE_LIST
)
3752 inner_decl
= TREE_VALUE (inner_decl
);
3753 if (inner_decl
== NULL_TREE
3754 || TREE_CODE (inner_decl
) == IDENTIFIER_NODE
)
3755 attr_flags
|= (int) ATTR_FLAG_DECL_NEXT
;
3756 else if (TREE_CODE (inner_decl
) == CALL_EXPR
)
3757 attr_flags
|= (int) ATTR_FLAG_FUNCTION_NEXT
;
3758 else if (TREE_CODE (inner_decl
) == ARRAY_REF
)
3759 attr_flags
|= (int) ATTR_FLAG_ARRAY_NEXT
;
3760 returned_attrs
= decl_attributes (&type
,
3761 chainon (returned_attrs
, attrs
),
3764 else if (TREE_CODE (declarator
) == ARRAY_REF
)
3766 tree itype
= NULL_TREE
;
3767 tree size
= TREE_OPERAND (declarator
, 1);
3768 /* The index is a signed object `sizetype' bits wide. */
3769 tree index_type
= c_common_signed_type (sizetype
);
3771 array_ptr_quals
= TREE_TYPE (declarator
);
3772 array_parm_static
= TREE_STATIC (declarator
);
3774 declarator
= TREE_OPERAND (declarator
, 0);
3776 /* Check for some types that there cannot be arrays of. */
3778 if (VOID_TYPE_P (type
))
3780 error ("declaration of `%s' as array of voids", name
);
3781 type
= error_mark_node
;
3784 if (TREE_CODE (type
) == FUNCTION_TYPE
)
3786 error ("declaration of `%s' as array of functions", name
);
3787 type
= error_mark_node
;
3790 if (pedantic
&& flexible_array_type_p (type
))
3791 pedwarn ("invalid use of structure with flexible array member");
3793 if (size
== error_mark_node
)
3794 type
= error_mark_node
;
3796 if (type
== error_mark_node
)
3799 /* If size was specified, set ITYPE to a range-type for that size.
3800 Otherwise, ITYPE remains null. finish_decl may figure it out
3801 from an initial value. */
3805 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
3806 STRIP_TYPE_NOPS (size
);
3808 if (! INTEGRAL_TYPE_P (TREE_TYPE (size
)))
3810 error ("size of array `%s' has non-integer type", name
);
3811 size
= integer_one_node
;
3814 if (pedantic
&& integer_zerop (size
))
3815 pedwarn ("ISO C forbids zero-size array `%s'", name
);
3817 if (TREE_CODE (size
) == INTEGER_CST
)
3819 constant_expression_warning (size
);
3820 if (tree_int_cst_sgn (size
) < 0)
3822 error ("size of array `%s' is negative", name
);
3823 size
= integer_one_node
;
3828 /* Make sure the array size remains visibly nonconstant
3829 even if it is (eg) a const variable with known value. */
3832 if (!flag_isoc99
&& pedantic
)
3834 if (TREE_CONSTANT (size
))
3835 pedwarn ("ISO C90 forbids array `%s' whose size can't be evaluated",
3838 pedwarn ("ISO C90 forbids variable-size array `%s'",
3843 if (integer_zerop (size
))
3845 /* A zero-length array cannot be represented with an
3846 unsigned index type, which is what we'll get with
3847 build_index_type. Create an open-ended range instead. */
3848 itype
= build_range_type (sizetype
, size
, NULL_TREE
);
3852 /* Compute the maximum valid index, that is, size - 1.
3853 Do the calculation in index_type, so that if it is
3854 a variable the computations will be done in the
3856 itype
= fold (build (MINUS_EXPR
, index_type
,
3857 convert (index_type
, size
),
3858 convert (index_type
, size_one_node
)));
3860 /* If that overflowed, the array is too big.
3861 ??? While a size of INT_MAX+1 technically shouldn't
3862 cause an overflow (because we subtract 1), the overflow
3863 is recorded during the conversion to index_type, before
3864 the subtraction. Handling this case seems like an
3865 unnecessary complication. */
3866 if (TREE_OVERFLOW (itype
))
3868 error ("size of array `%s' is too large", name
);
3869 type
= error_mark_node
;
3875 /* We must be able to distinguish the
3876 SAVE_EXPR_CONTEXT for the variably-sized type
3877 so that we can set it correctly in
3878 set_save_expr_context. The convention is
3879 that all SAVE_EXPRs that need to be reset
3880 have NULL_TREE for their SAVE_EXPR_CONTEXT. */
3881 tree cfd
= current_function_decl
;
3882 if (decl_context
== PARM
)
3883 current_function_decl
= NULL_TREE
;
3884 itype
= variable_size (itype
);
3885 if (decl_context
== PARM
)
3886 current_function_decl
= cfd
;
3888 itype
= build_index_type (itype
);
3891 else if (decl_context
== FIELD
)
3893 if (pedantic
&& !flag_isoc99
&& !in_system_header
)
3894 pedwarn ("ISO C90 does not support flexible array members");
3896 /* ISO C99 Flexible array members are effectively identical
3897 to GCC's zero-length array extension. */
3898 itype
= build_range_type (sizetype
, size_zero_node
, NULL_TREE
);
3901 /* If pedantic, complain about arrays of incomplete types. */
3903 if (pedantic
&& !COMPLETE_TYPE_P (type
))
3904 pedwarn ("array type has incomplete element type");
3906 /* Build the array type itself, then merge any constancy or
3907 volatility into the target type. We must do it in this order
3908 to ensure that the TYPE_MAIN_VARIANT field of the array type
3909 is set correctly. */
3911 type
= build_array_type (type
, itype
);
3913 type
= c_build_qualified_type (type
, type_quals
);
3916 C_TYPE_VARIABLE_SIZE (type
) = 1;
3918 /* The GCC extension for zero-length arrays differs from
3919 ISO flexible array members in that sizeof yields zero. */
3920 if (size
&& integer_zerop (size
))
3923 TYPE_SIZE (type
) = bitsize_zero_node
;
3924 TYPE_SIZE_UNIT (type
) = size_zero_node
;
3926 if (decl_context
!= PARM
3927 && (array_ptr_quals
!= NULL_TREE
|| array_parm_static
))
3929 error ("static or type qualifiers in non-parameter array declarator");
3930 array_ptr_quals
= NULL_TREE
;
3931 array_parm_static
= 0;
3934 else if (TREE_CODE (declarator
) == CALL_EXPR
)
3938 /* Declaring a function type.
3939 Make sure we have a valid type for the function to return. */
3940 if (type
== error_mark_node
)
3945 /* Warn about some types functions can't return. */
3947 if (TREE_CODE (type
) == FUNCTION_TYPE
)
3949 error ("`%s' declared as function returning a function", name
);
3950 type
= integer_type_node
;
3952 if (TREE_CODE (type
) == ARRAY_TYPE
)
3954 error ("`%s' declared as function returning an array", name
);
3955 type
= integer_type_node
;
3958 /* Construct the function type and go to the next
3959 inner layer of declarator. */
3961 arg_types
= grokparms (TREE_OPERAND (declarator
, 1),
3963 /* Say it's a definition
3964 only for the CALL_EXPR
3965 closest to the identifier. */
3966 && TREE_CODE (TREE_OPERAND (declarator
, 0)) == IDENTIFIER_NODE
);
3967 /* Type qualifiers before the return type of the function
3968 qualify the return type, not the function type. */
3971 /* Type qualifiers on a function return type are normally
3972 permitted by the standard but have no effect, so give a
3973 warning at -Wextra. Qualifiers on a void return type have
3974 meaning as a GNU extension, and are banned on function
3975 definitions in ISO C. FIXME: strictly we shouldn't
3976 pedwarn for qualified void return types except on function
3977 definitions, but not doing so could lead to the undesirable
3978 state of a "volatile void" function return type not being
3979 warned about, and a use of the function being compiled
3980 with GNU semantics, with no diagnostics under -pedantic. */
3981 if (VOID_TYPE_P (type
) && pedantic
&& !in_system_header
)
3982 pedwarn ("ISO C forbids qualified void function return type");
3983 else if (extra_warnings
3984 && !(VOID_TYPE_P (type
)
3985 && type_quals
== TYPE_QUAL_VOLATILE
))
3986 warning ("type qualifiers ignored on function return type");
3988 type
= c_build_qualified_type (type
, type_quals
);
3990 type_quals
= TYPE_UNQUALIFIED
;
3992 type
= build_function_type (type
, arg_types
);
3993 declarator
= TREE_OPERAND (declarator
, 0);
3995 /* Set the TYPE_CONTEXTs for each tagged type which is local to
3996 the formal parameter list of this FUNCTION_TYPE to point to
3997 the FUNCTION_TYPE node itself. */
4002 for (link
= last_function_parm_tags
;
4004 link
= TREE_CHAIN (link
))
4005 TYPE_CONTEXT (TREE_VALUE (link
)) = type
;
4008 else if (TREE_CODE (declarator
) == INDIRECT_REF
)
4010 /* Merge any constancy or volatility into the target type
4013 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
4015 pedwarn ("ISO C forbids qualified function types");
4017 type
= c_build_qualified_type (type
, type_quals
);
4018 type_quals
= TYPE_UNQUALIFIED
;
4021 type
= build_pointer_type (type
);
4023 /* Process a list of type modifier keywords
4024 (such as const or volatile) that were given inside the `*'. */
4026 if (TREE_TYPE (declarator
))
4034 for (typemodlist
= TREE_TYPE (declarator
); typemodlist
;
4035 typemodlist
= TREE_CHAIN (typemodlist
))
4037 tree qualifier
= TREE_VALUE (typemodlist
);
4039 if (C_IS_RESERVED_WORD (qualifier
))
4041 if (C_RID_CODE (qualifier
) == RID_CONST
)
4043 else if (C_RID_CODE (qualifier
) == RID_VOLATILE
)
4045 else if (C_RID_CODE (qualifier
) == RID_RESTRICT
)
4055 error ("invalid type modifier within pointer declarator");
4056 if (constp
> 1 && ! flag_isoc99
)
4057 pedwarn ("duplicate `const'");
4058 if (volatilep
> 1 && ! flag_isoc99
)
4059 pedwarn ("duplicate `volatile'");
4060 if (restrictp
> 1 && ! flag_isoc99
)
4061 pedwarn ("duplicate `restrict'");
4063 type_quals
= ((constp
? TYPE_QUAL_CONST
: 0)
4064 | (restrictp
? TYPE_QUAL_RESTRICT
: 0)
4065 | (volatilep
? TYPE_QUAL_VOLATILE
: 0));
4068 declarator
= TREE_OPERAND (declarator
, 0);
4075 /* Now TYPE has the actual type. */
4077 /* Did array size calculations overflow? */
4079 if (TREE_CODE (type
) == ARRAY_TYPE
4080 && COMPLETE_TYPE_P (type
)
4081 && TREE_OVERFLOW (TYPE_SIZE (type
)))
4083 error ("size of array `%s' is too large", name
);
4084 /* If we proceed with the array type as it is, we'll eventually
4085 crash in tree_low_cst(). */
4086 type
= error_mark_node
;
4089 /* If this is declaring a typedef name, return a TYPE_DECL. */
4091 if (specbits
& (1 << (int) RID_TYPEDEF
))
4094 /* Note that the grammar rejects storage classes
4095 in typenames, fields or parameters */
4096 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
4098 pedwarn ("ISO C forbids qualified function types");
4100 type
= c_build_qualified_type (type
, type_quals
);
4101 decl
= build_decl (TYPE_DECL
, declarator
, type
);
4102 if ((specbits
& (1 << (int) RID_SIGNED
))
4103 || (typedef_decl
&& C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl
)))
4104 C_TYPEDEF_EXPLICITLY_SIGNED (decl
) = 1;
4105 decl_attributes (&decl
, returned_attrs
, 0);
4109 /* Detect the case of an array type of unspecified size
4110 which came, as such, direct from a typedef name.
4111 We must copy the type, so that each identifier gets
4112 a distinct type, so that each identifier's size can be
4113 controlled separately by its own initializer. */
4115 if (type
!= 0 && typedef_type
!= 0
4116 && TREE_CODE (type
) == ARRAY_TYPE
&& TYPE_DOMAIN (type
) == 0
4117 && TYPE_MAIN_VARIANT (type
) == TYPE_MAIN_VARIANT (typedef_type
))
4119 type
= build_array_type (TREE_TYPE (type
), 0);
4121 C_TYPE_VARIABLE_SIZE (type
) = 1;
4124 /* If this is a type name (such as, in a cast or sizeof),
4125 compute the type and return it now. */
4127 if (decl_context
== TYPENAME
)
4129 /* Note that the grammar rejects storage classes
4130 in typenames, fields or parameters */
4131 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
4133 pedwarn ("ISO C forbids const or volatile function types");
4135 type
= c_build_qualified_type (type
, type_quals
);
4136 decl_attributes (&type
, returned_attrs
, 0);
4140 /* Aside from typedefs and type names (handle above),
4141 `void' at top level (not within pointer)
4142 is allowed only in public variables.
4143 We don't complain about parms either, but that is because
4144 a better error message can be made later. */
4146 if (VOID_TYPE_P (type
) && decl_context
!= PARM
4147 && ! ((decl_context
!= FIELD
&& TREE_CODE (type
) != FUNCTION_TYPE
)
4148 && ((specbits
& (1 << (int) RID_EXTERN
))
4149 || (current_scope
== global_scope
4151 & ((1 << (int) RID_STATIC
) | (1 << (int) RID_REGISTER
)))))))
4153 error ("variable or field `%s' declared void", name
);
4154 type
= integer_type_node
;
4157 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4158 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4163 if (decl_context
== PARM
)
4165 tree type_as_written
;
4168 /* A parameter declared as an array of T is really a pointer to T.
4169 One declared as a function is really a pointer to a function. */
4171 if (TREE_CODE (type
) == ARRAY_TYPE
)
4173 /* Transfer const-ness of array into that of type pointed to. */
4174 type
= TREE_TYPE (type
);
4176 type
= c_build_qualified_type (type
, type_quals
);
4177 type
= build_pointer_type (type
);
4178 type_quals
= TYPE_UNQUALIFIED
;
4179 if (array_ptr_quals
)
4181 tree new_ptr_quals
, new_ptr_attrs
;
4183 split_specs_attrs (array_ptr_quals
, &new_ptr_quals
, &new_ptr_attrs
);
4184 /* We don't yet implement attributes in this context. */
4185 if (new_ptr_attrs
!= NULL_TREE
)
4186 warning ("attributes in parameter array declarator ignored");
4191 for (; new_ptr_quals
; new_ptr_quals
= TREE_CHAIN (new_ptr_quals
))
4193 tree qualifier
= TREE_VALUE (new_ptr_quals
);
4195 if (C_IS_RESERVED_WORD (qualifier
))
4197 if (C_RID_CODE (qualifier
) == RID_CONST
)
4199 else if (C_RID_CODE (qualifier
) == RID_VOLATILE
)
4201 else if (C_RID_CODE (qualifier
) == RID_RESTRICT
)
4211 error ("invalid type modifier within array declarator");
4213 type_quals
= ((constp
? TYPE_QUAL_CONST
: 0)
4214 | (restrictp
? TYPE_QUAL_RESTRICT
: 0)
4215 | (volatilep
? TYPE_QUAL_VOLATILE
: 0));
4219 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
4221 if (pedantic
&& type_quals
)
4222 pedwarn ("ISO C forbids qualified function types");
4224 type
= c_build_qualified_type (type
, type_quals
);
4225 type
= build_pointer_type (type
);
4226 type_quals
= TYPE_UNQUALIFIED
;
4228 else if (type_quals
)
4229 type
= c_build_qualified_type (type
, type_quals
);
4231 type_as_written
= type
;
4233 decl
= build_decl (PARM_DECL
, declarator
, type
);
4235 C_DECL_VARIABLE_SIZE (decl
) = 1;
4237 /* Compute the type actually passed in the parmlist,
4238 for the case where there is no prototype.
4239 (For example, shorts and chars are passed as ints.)
4240 When there is a prototype, this is overridden later. */
4242 if (type
== error_mark_node
)
4243 promoted_type
= type
;
4245 promoted_type
= c_type_promotes_to (type
);
4247 DECL_ARG_TYPE (decl
) = promoted_type
;
4248 DECL_ARG_TYPE_AS_WRITTEN (decl
) = type_as_written
;
4250 else if (decl_context
== FIELD
)
4252 /* Structure field. It may not be a function. */
4254 if (TREE_CODE (type
) == FUNCTION_TYPE
)
4256 error ("field `%s' declared as a function", name
);
4257 type
= build_pointer_type (type
);
4259 else if (TREE_CODE (type
) != ERROR_MARK
4260 && !COMPLETE_OR_UNBOUND_ARRAY_TYPE_P (type
))
4262 error ("field `%s' has incomplete type", name
);
4263 type
= error_mark_node
;
4265 /* Move type qualifiers down to element of an array. */
4266 if (TREE_CODE (type
) == ARRAY_TYPE
&& type_quals
)
4267 type
= build_array_type (c_build_qualified_type (TREE_TYPE (type
),
4269 TYPE_DOMAIN (type
));
4270 decl
= build_decl (FIELD_DECL
, declarator
, type
);
4271 DECL_NONADDRESSABLE_P (decl
) = bitfield
;
4274 C_DECL_VARIABLE_SIZE (decl
) = 1;
4276 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
4278 /* Every function declaration is "external"
4279 except for those which are inside a function body
4280 in which `auto' is used.
4281 That is a case not specified by ANSI C,
4282 and we use it for forward declarations for nested functions. */
4283 int extern_ref
= (!(specbits
& (1 << (int) RID_AUTO
))
4284 || current_scope
== global_scope
);
4286 if (specbits
& (1 << (int) RID_AUTO
)
4287 && (pedantic
|| current_scope
== global_scope
))
4288 pedwarn ("invalid storage class for function `%s'", name
);
4289 if (specbits
& (1 << (int) RID_REGISTER
))
4290 error ("invalid storage class for function `%s'", name
);
4291 if (specbits
& (1 << (int) RID_THREAD
))
4292 error ("invalid storage class for function `%s'", name
);
4293 /* Function declaration not at file scope.
4294 Storage classes other than `extern' are not allowed
4295 and `extern' makes no difference. */
4296 if (current_scope
!= global_scope
4297 && (specbits
& ((1 << (int) RID_STATIC
) | (1 << (int) RID_INLINE
)))
4299 pedwarn ("invalid storage class for function `%s'", name
);
4301 decl
= build_decl (FUNCTION_DECL
, declarator
, type
);
4302 decl
= build_decl_attribute_variant (decl
, decl_attr
);
4304 DECL_LANG_SPECIFIC (decl
)
4305 = ggc_alloc_cleared (sizeof (struct lang_decl
));
4307 if (pedantic
&& type_quals
&& ! DECL_IN_SYSTEM_HEADER (decl
))
4308 pedwarn ("ISO C forbids qualified function types");
4310 /* GNU C interprets a `volatile void' return type to indicate
4311 that the function does not return. */
4312 if ((type_quals
& TYPE_QUAL_VOLATILE
)
4313 && !VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl
))))
4314 warning ("`noreturn' function returns non-void value");
4317 DECL_EXTERNAL (decl
) = 1;
4318 /* Record absence of global scope for `static' or `auto'. */
4320 = !(specbits
& ((1 << (int) RID_STATIC
) | (1 << (int) RID_AUTO
)));
4323 C_FUNCTION_IMPLICIT_INT (decl
) = 1;
4325 /* Record presence of `inline', if it is reasonable. */
4326 if (MAIN_NAME_P (declarator
))
4329 warning ("cannot inline function `main'");
4333 /* Assume that otherwise the function can be inlined. */
4334 DECL_DECLARED_INLINE_P (decl
) = 1;
4336 /* Do not mark bare declarations as DECL_INLINE. Doing so
4337 in the presence of multiple declarations can result in
4338 the abstract origin pointing between the declarations,
4339 which will confuse dwarf2out. */
4342 DECL_INLINE (decl
) = 1;
4343 if (specbits
& (1 << (int) RID_EXTERN
))
4344 current_extern_inline
= 1;
4347 /* If -finline-functions, assume it can be inlined. This does
4348 two things: let the function be deferred until it is actually
4349 needed, and let dwarf2 know that the function is inlinable. */
4350 else if (flag_inline_trees
== 2 && initialized
)
4352 if (!DECL_INLINE (decl
))
4353 DID_INLINE_FUNC (decl
) = 1;
4354 DECL_INLINE (decl
) = 1;
4355 DECL_DECLARED_INLINE_P (decl
) = 0;
4360 /* It's a variable. */
4361 /* An uninitialized decl with `extern' is a reference. */
4362 int extern_ref
= !initialized
&& (specbits
& (1 << (int) RID_EXTERN
));
4364 /* Move type qualifiers down to element of an array. */
4365 if (TREE_CODE (type
) == ARRAY_TYPE
&& type_quals
)
4367 int saved_align
= TYPE_ALIGN(type
);
4368 type
= build_array_type (c_build_qualified_type (TREE_TYPE (type
),
4370 TYPE_DOMAIN (type
));
4371 TYPE_ALIGN (type
) = saved_align
;
4373 else if (type_quals
)
4374 type
= c_build_qualified_type (type
, type_quals
);
4376 /* It is invalid to create an `extern' declaration for a
4377 variable if there is a global declaration that is
4379 if (extern_ref
&& current_scope
!= global_scope
)
4383 global_decl
= identifier_global_value (declarator
);
4385 && TREE_CODE (global_decl
) == VAR_DECL
4386 && !TREE_PUBLIC (global_decl
))
4387 error ("variable previously declared `static' redeclared "
4391 decl
= build_decl (VAR_DECL
, declarator
, type
);
4393 C_DECL_VARIABLE_SIZE (decl
) = 1;
4396 pedwarn ("%Hvariable '%D' declared `inline'",
4397 &DECL_SOURCE_LOCATION (decl
), decl
);
4399 DECL_EXTERNAL (decl
) = extern_ref
;
4401 /* At file scope, the presence of a `static' or `register' storage
4402 class specifier, or the absence of all storage class specifiers
4403 makes this declaration a definition (perhaps tentative). Also,
4404 the absence of both `static' and `register' makes it public. */
4405 if (current_scope
== global_scope
)
4407 TREE_PUBLIC (decl
) = !(specbits
& ((1 << (int) RID_STATIC
)
4408 | (1 << (int) RID_REGISTER
)));
4409 TREE_STATIC (decl
) = !extern_ref
;
4411 /* Not at file scope, only `static' makes a static definition. */
4414 TREE_STATIC (decl
) = (specbits
& (1 << (int) RID_STATIC
)) != 0;
4415 TREE_PUBLIC (decl
) = extern_ref
;
4418 if (specbits
& 1 << (int) RID_THREAD
)
4420 if (targetm
.have_tls
)
4421 DECL_THREAD_LOCAL (decl
) = 1;
4423 /* A mere warning is sure to result in improper semantics
4424 at runtime. Don't bother to allow this to compile. */
4425 error ("thread-local storage not supported for this target");
4429 /* Record `register' declaration for warnings on &
4430 and in case doing stupid register allocation. */
4432 if (specbits
& (1 << (int) RID_REGISTER
))
4433 DECL_REGISTER (decl
) = 1;
4435 /* Record constancy and volatility. */
4436 c_apply_type_quals_to_decl (type_quals
, decl
);
4438 /* If a type has volatile components, it should be stored in memory.
4439 Otherwise, the fact that those components are volatile
4440 will be ignored, and would even crash the compiler. */
4441 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl
)))
4442 c_mark_addressable (decl
);
4444 #ifdef ENABLE_CHECKING
4445 /* This is the earliest point at which we might know the assembler
4446 name of a variable. Thus, if it's known before this, die horribly. */
4447 if (DECL_ASSEMBLER_NAME_SET_P (decl
))
4451 decl_attributes (&decl
, returned_attrs
, 0);
4457 /* Decode the parameter-list info for a function type or function definition.
4458 The argument is the value returned by `get_parm_info' (or made in parse.y
4459 if there is an identifier list instead of a parameter decl list).
4460 These two functions are separate because when a function returns
4461 or receives functions then each is called multiple times but the order
4462 of calls is different. The last call to `grokparms' is always the one
4463 that contains the formal parameter names of a function definition.
4465 Store in `last_function_parms' a chain of the decls of parms.
4466 Also store in `last_function_parm_tags' a chain of the struct, union,
4467 and enum tags declared among the parms.
4469 Return a list of arg types to use in the FUNCTION_TYPE for this function.
4471 FUNCDEF_FLAG is nonzero for a function definition, 0 for
4472 a mere declaration. A nonempty identifier-list gets an error message
4473 when FUNCDEF_FLAG is zero. */
4476 grokparms (tree parms_info
, int funcdef_flag
)
4478 tree first_parm
= TREE_CHAIN (parms_info
);
4480 last_function_parms
= TREE_PURPOSE (parms_info
);
4481 last_function_parm_tags
= TREE_VALUE (parms_info
);
4482 last_function_parm_others
= TREE_TYPE (parms_info
);
4484 if (warn_strict_prototypes
&& first_parm
== 0 && !funcdef_flag
4485 && !in_system_header
)
4486 warning ("function declaration isn't a prototype");
4489 && TREE_CODE (TREE_VALUE (first_parm
)) == IDENTIFIER_NODE
)
4492 pedwarn ("parameter names (without types) in function declaration");
4494 last_function_parms
= first_parm
;
4501 /* If the arg types are incomplete in a declaration,
4502 they must include undefined tags.
4503 These tags can never be defined in the scope of the declaration,
4504 so the types can never be completed,
4505 and no call can be compiled successfully. */
4507 for (parm
= last_function_parms
, typelt
= first_parm
;
4509 parm
= TREE_CHAIN (parm
))
4510 /* Skip over any enumeration constants declared here. */
4511 if (TREE_CODE (parm
) == PARM_DECL
)
4513 /* Barf if the parameter itself has an incomplete type. */
4514 tree type
= TREE_VALUE (typelt
);
4515 if (type
== error_mark_node
)
4517 if (!COMPLETE_TYPE_P (type
))
4519 if (funcdef_flag
&& DECL_NAME (parm
) != 0)
4520 error ("parameter `%s' has incomplete type",
4521 IDENTIFIER_POINTER (DECL_NAME (parm
)));
4523 warning ("parameter has incomplete type");
4526 TREE_VALUE (typelt
) = error_mark_node
;
4527 TREE_TYPE (parm
) = error_mark_node
;
4530 typelt
= TREE_CHAIN (typelt
);
4537 /* Return a tree_list node with info on a parameter list just parsed.
4538 The TREE_PURPOSE is a list of decls of those parms.
4539 The TREE_VALUE is a list of structure, union and enum tags defined.
4540 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
4541 The TREE_TYPE is a list of non-parameter decls which appeared with the
4543 This tree_list node is later fed to `grokparms'.
4545 VOID_AT_END nonzero means append `void' to the end of the type-list.
4546 Zero means the parmlist ended with an ellipsis so don't append `void'. */
4549 get_parm_info (int void_at_end
)
4551 tree decl
, type
, list
;
4553 tree
*last_type
= &types
;
4554 tree tags
= current_scope
->tags
;
4555 tree parms
= current_scope
->parms
;
4556 tree others
= current_scope
->names
;
4557 static bool explained_incomplete_types
= false;
4558 bool gave_void_only_once_err
= false;
4560 /* Just "void" (and no ellipsis) is special. There are really no parms.
4561 But if the "void" is qualified (by "const" or "volatile"), or has a
4562 storage class specifier ("register"), then the behavior is undefined;
4563 issue an error. Typedefs for "void" are OK (see DR#157). */
4564 if (void_at_end
&& parms
!= 0
4565 && TREE_CHAIN (parms
) == 0
4566 && VOID_TYPE_P (TREE_TYPE (parms
))
4567 && !DECL_NAME (parms
))
4569 if (TREE_THIS_VOLATILE (parms
)
4570 || TREE_READONLY (parms
)
4571 || DECL_REGISTER (parms
))
4572 error ("\"void\" as only parameter may not be qualified");
4574 return tree_cons (0, 0, tree_cons (0, void_type_node
, 0));
4577 /* Sanity check all of the parameter declarations. */
4578 for (decl
= parms
; decl
; decl
= TREE_CHAIN (decl
))
4580 if (TREE_CODE (decl
) != PARM_DECL
)
4582 if (TREE_ASM_WRITTEN (decl
))
4585 /* Since there is a prototype, args are passed in their
4586 declared types. The back end may override this. */
4587 type
= TREE_TYPE (decl
);
4588 DECL_ARG_TYPE (decl
) = type
;
4589 if (PROMOTE_PROTOTYPES
4590 && INTEGRAL_TYPE_P (type
)
4591 && TYPE_PRECISION (type
) < TYPE_PRECISION (integer_type_node
))
4592 DECL_ARG_TYPE (decl
) = integer_type_node
;
4594 /* Check for (..., void, ...) and issue an error. */
4595 if (VOID_TYPE_P (type
) && !DECL_NAME (decl
) && !gave_void_only_once_err
)
4597 error ("\"void\" must be the only parameter");
4598 gave_void_only_once_err
= true;
4601 type
= build_tree_list (0, type
);
4603 last_type
= &TREE_CHAIN (type
);
4606 /* Check the list of non-parameter decls for any forward parm decls
4607 that never got real decls. */
4608 for (decl
= others
; decl
; decl
= TREE_CHAIN (decl
))
4609 if (TREE_CODE (decl
) == PARM_DECL
)
4611 if (!TREE_ASM_WRITTEN (decl
))
4614 error ("%Hparameter \"%D\" has just a forward declaration",
4615 &DECL_SOURCE_LOCATION (decl
), decl
);
4618 /* Warn about any struct, union or enum tags defined within this
4619 list. The scope of such types is limited to this declaration,
4620 which is rarely if ever desirable (it's impossible to call such
4621 a function with type-correct arguments). */
4622 for (decl
= tags
; decl
; decl
= TREE_CHAIN (decl
))
4624 enum tree_code code
= TREE_CODE (TREE_VALUE (decl
));
4625 const char *keyword
;
4626 /* An anonymous union parm type is meaningful as a GNU extension.
4627 So don't warn for that. */
4628 if (code
== UNION_TYPE
&& TREE_PURPOSE (decl
) == 0 && !pedantic
)
4631 /* The keyword should not be translated. */
4634 case RECORD_TYPE
: keyword
= "struct"; break;
4635 case UNION_TYPE
: keyword
= "union"; break;
4636 case ENUMERAL_TYPE
: keyword
= "enum"; break;
4640 if (TREE_PURPOSE (decl
))
4641 /* The first %s will be one of 'struct', 'union', or 'enum'. */
4642 warning ("\"%s %s\" declared inside parameter list",
4643 keyword
, IDENTIFIER_POINTER (TREE_PURPOSE (decl
)));
4645 /* The %s will be one of 'struct', 'union', or 'enum'. */
4646 warning ("anonymous %s declared inside parameter list", keyword
);
4648 if (! explained_incomplete_types
)
4650 warning ("its scope is only this definition or declaration,"
4651 " which is probably not what you want");
4652 explained_incomplete_types
= true;
4659 type
= build_tree_list (0, void_type_node
);
4663 list
= tree_cons (parms
, tags
, types
);
4664 TREE_TYPE (list
) = others
;
4668 /* Get the struct, enum or union (CODE says which) with tag NAME.
4669 Define the tag as a forward-reference if it is not defined. */
4672 xref_tag (enum tree_code code
, tree name
)
4674 /* If a cross reference is requested, look up the type
4675 already defined for this tag and return it. */
4677 tree ref
= lookup_tag (code
, name
, 0);
4678 /* If this is the right type of tag, return what we found.
4679 (This reference will be shadowed by shadow_tag later if appropriate.)
4680 If this is the wrong type of tag, do not return it. If it was the
4681 wrong type in the same scope, we will have had an error
4682 message already; if in a different scope and declaring
4683 a name, pending_xref_error will give an error message; but if in a
4684 different scope and not declaring a name, this tag should
4685 shadow the previous declaration of a different type of tag, and
4686 this would not work properly if we return the reference found.
4687 (For example, with "struct foo" in an outer scope, "union foo;"
4688 must shadow that tag with a new one of union type.) */
4689 if (ref
&& TREE_CODE (ref
) == code
)
4692 /* If no such tag is yet defined, create a forward-reference node
4693 and record it as the "definition".
4694 When a real declaration of this type is found,
4695 the forward-reference will be altered into a real type. */
4697 ref
= make_node (code
);
4698 if (code
== ENUMERAL_TYPE
)
4700 /* Give the type a default layout like unsigned int
4701 to avoid crashing if it does not get defined. */
4702 TYPE_MODE (ref
) = TYPE_MODE (unsigned_type_node
);
4703 TYPE_ALIGN (ref
) = TYPE_ALIGN (unsigned_type_node
);
4704 TYPE_USER_ALIGN (ref
) = 0;
4705 TREE_UNSIGNED (ref
) = 1;
4706 TYPE_PRECISION (ref
) = TYPE_PRECISION (unsigned_type_node
);
4707 TYPE_MIN_VALUE (ref
) = TYPE_MIN_VALUE (unsigned_type_node
);
4708 TYPE_MAX_VALUE (ref
) = TYPE_MAX_VALUE (unsigned_type_node
);
4711 pushtag (name
, ref
);
4716 /* Make sure that the tag NAME is defined *in the current scope*
4717 at least as a forward reference.
4718 CODE says which kind of tag NAME ought to be. */
4721 start_struct (enum tree_code code
, tree name
)
4723 /* If there is already a tag defined at this scope
4724 (as a forward reference), just return it. */
4729 ref
= lookup_tag (code
, name
, 1);
4730 if (ref
&& TREE_CODE (ref
) == code
)
4732 if (TYPE_FIELDS (ref
))
4734 if (code
== UNION_TYPE
)
4735 error ("redefinition of `union %s'", IDENTIFIER_POINTER (name
));
4737 error ("redefinition of `struct %s'", IDENTIFIER_POINTER (name
));
4742 /* Otherwise create a forward-reference just so the tag is in scope. */
4744 ref
= make_node (code
);
4745 pushtag (name
, ref
);
4748 C_TYPE_BEING_DEFINED (ref
) = 1;
4749 TYPE_PACKED (ref
) = flag_pack_struct
;
4753 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
4754 of a structure component, returning a FIELD_DECL node.
4755 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
4757 This is done during the parsing of the struct declaration.
4758 The FIELD_DECL nodes are chained together and the lot of them
4759 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
4762 grokfield (tree declarator
, tree declspecs
, tree width
)
4766 if (declarator
== NULL_TREE
&& width
== NULL_TREE
)
4768 /* This is an unnamed decl.
4770 If we have something of the form "union { list } ;" then this
4771 is the anonymous union extension. Similarly for struct.
4773 If this is something of the form "struct foo;", then
4774 If MS extensions are enabled, this is handled as an
4776 Otherwise this is a forward declaration of a structure tag.
4778 If this is something of the form "foo;" and foo is a TYPE_DECL, then
4779 If MS extensions are enabled and foo names a structure, then
4780 again this is an anonymous struct.
4781 Otherwise this is an error.
4783 Oh what a horrid tangled web we weave. I wonder if MS consciously
4784 took this from Plan 9 or if it was an accident of implementation
4785 that took root before someone noticed the bug... */
4787 tree type
= TREE_VALUE (declspecs
);
4789 if (flag_ms_extensions
&& TREE_CODE (type
) == TYPE_DECL
)
4790 type
= TREE_TYPE (type
);
4791 if (TREE_CODE (type
) == RECORD_TYPE
|| TREE_CODE (type
) == UNION_TYPE
)
4793 if (flag_ms_extensions
)
4796 goto warn_unnamed_field
;
4797 else if (TYPE_NAME (type
) == NULL
)
4800 goto warn_unnamed_field
;
4805 warning ("declaration does not declare anything");
4810 value
= grokdeclarator (declarator
, declspecs
, width
? BITFIELD
: FIELD
, 0);
4812 finish_decl (value
, NULL_TREE
, NULL_TREE
);
4813 DECL_INITIAL (value
) = width
;
4815 if (c_dialect_objc ())
4816 objc_check_decl (value
);
4820 /* Generate an error for any duplicate field names in FIELDLIST. Munge
4821 the list such that this does not present a problem later. */
4824 detect_field_duplicates (tree fieldlist
)
4829 /* First, see if there are more than "a few" fields.
4830 This is trivially true if there are zero or one fields. */
4833 x
= TREE_CHAIN (fieldlist
);
4839 } while (timeout
> 0 && x
);
4841 /* If there were "few" fields, avoid the overhead of allocating
4842 a hash table. Instead just do the nested traversal thing. */
4845 for (x
= TREE_CHAIN (fieldlist
); x
; x
= TREE_CHAIN (x
))
4848 for (y
= fieldlist
; y
!= x
; y
= TREE_CHAIN (y
))
4849 if (DECL_NAME (y
) == DECL_NAME (x
))
4851 error ("%Hduplicate member '%D'",
4852 &DECL_SOURCE_LOCATION (x
), x
);
4853 DECL_NAME (x
) = NULL_TREE
;
4859 htab_t htab
= htab_create (37, htab_hash_pointer
, htab_eq_pointer
, NULL
);
4862 for (x
= fieldlist
; x
; x
= TREE_CHAIN (x
))
4863 if ((y
= DECL_NAME (x
)) != 0)
4865 slot
= htab_find_slot (htab
, y
, INSERT
);
4868 error ("%Hduplicate member '%D'",
4869 &DECL_SOURCE_LOCATION (x
), x
);
4870 DECL_NAME (x
) = NULL_TREE
;
4879 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
4880 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
4881 ATTRIBUTES are attributes to be applied to the structure. */
4884 finish_struct (tree t
, tree fieldlist
, tree attributes
)
4887 int toplevel
= global_scope
== current_scope
;
4888 int saw_named_field
;
4890 /* If this type was previously laid out as a forward reference,
4891 make sure we lay it out again. */
4895 decl_attributes (&t
, attributes
, (int) ATTR_FLAG_TYPE_IN_PLACE
);
4897 /* Nameless union parm types are useful as GCC extension. */
4898 if (! (TREE_CODE (t
) == UNION_TYPE
&& TYPE_NAME (t
) == 0) && !pedantic
)
4899 /* Otherwise, warn about any struct or union def. in parmlist. */
4900 if (in_parm_level_p ())
4903 pedwarn ("%s defined inside parms",
4904 TREE_CODE (t
) == UNION_TYPE
? _("union") : _("structure"));
4906 warning ("%s defined inside parms",
4907 TREE_CODE (t
) == UNION_TYPE
? _("union") : _("structure"));
4912 for (x
= fieldlist
; x
; x
= TREE_CHAIN (x
))
4913 if (DECL_NAME (x
) != 0)
4917 pedwarn ("%s has no %s",
4918 TREE_CODE (t
) == UNION_TYPE
? _("union") : _("struct"),
4919 fieldlist
? _("named members") : _("members"));
4922 /* Install struct as DECL_CONTEXT of each field decl.
4923 Also process specified field sizes,m which is found in the DECL_INITIAL.
4924 Store 0 there, except for ": 0" fields (so we can find them
4925 and delete them, below). */
4927 saw_named_field
= 0;
4928 for (x
= fieldlist
; x
; x
= TREE_CHAIN (x
))
4930 DECL_CONTEXT (x
) = t
;
4931 DECL_PACKED (x
) |= TYPE_PACKED (t
);
4933 /* If any field is const, the structure type is pseudo-const. */
4934 if (TREE_READONLY (x
))
4935 C_TYPE_FIELDS_READONLY (t
) = 1;
4938 /* A field that is pseudo-const makes the structure likewise. */
4939 tree t1
= TREE_TYPE (x
);
4940 while (TREE_CODE (t1
) == ARRAY_TYPE
)
4941 t1
= TREE_TYPE (t1
);
4942 if ((TREE_CODE (t1
) == RECORD_TYPE
|| TREE_CODE (t1
) == UNION_TYPE
)
4943 && C_TYPE_FIELDS_READONLY (t1
))
4944 C_TYPE_FIELDS_READONLY (t
) = 1;
4947 /* Any field that is volatile means variables of this type must be
4948 treated in some ways as volatile. */
4949 if (TREE_THIS_VOLATILE (x
))
4950 C_TYPE_FIELDS_VOLATILE (t
) = 1;
4952 /* Any field of nominal variable size implies structure is too. */
4953 if (C_DECL_VARIABLE_SIZE (x
))
4954 C_TYPE_VARIABLE_SIZE (t
) = 1;
4956 /* Detect invalid nested redefinition. */
4957 if (TREE_TYPE (x
) == t
)
4958 error ("nested redefinition of `%s'",
4959 IDENTIFIER_POINTER (TYPE_NAME (t
)));
4961 /* Detect invalid bit-field size. */
4962 if (DECL_INITIAL (x
))
4963 STRIP_NOPS (DECL_INITIAL (x
));
4964 if (DECL_INITIAL (x
))
4966 if (TREE_CODE (DECL_INITIAL (x
)) == INTEGER_CST
)
4967 constant_expression_warning (DECL_INITIAL (x
));
4970 error ("%Hbit-field '%D' width not an integer constant",
4971 &DECL_SOURCE_LOCATION (x
), x
);
4972 DECL_INITIAL (x
) = NULL
;
4976 /* Detect invalid bit-field type. */
4977 if (DECL_INITIAL (x
)
4978 && TREE_CODE (TREE_TYPE (x
)) != INTEGER_TYPE
4979 && TREE_CODE (TREE_TYPE (x
)) != BOOLEAN_TYPE
4980 && TREE_CODE (TREE_TYPE (x
)) != ENUMERAL_TYPE
)
4982 error ("%Hbit-field '%D' has invalid type",
4983 &DECL_SOURCE_LOCATION (x
), x
);
4984 DECL_INITIAL (x
) = NULL
;
4987 if (DECL_INITIAL (x
) && pedantic
4988 && TYPE_MAIN_VARIANT (TREE_TYPE (x
)) != integer_type_node
4989 && TYPE_MAIN_VARIANT (TREE_TYPE (x
)) != unsigned_type_node
4990 && TYPE_MAIN_VARIANT (TREE_TYPE (x
)) != boolean_type_node
4991 /* Accept an enum that's equivalent to int or unsigned int. */
4992 && !(TREE_CODE (TREE_TYPE (x
)) == ENUMERAL_TYPE
4993 && (TYPE_PRECISION (TREE_TYPE (x
))
4994 == TYPE_PRECISION (integer_type_node
))))
4995 pedwarn ("%Hbit-field '%D' type invalid in ISO C",
4996 &DECL_SOURCE_LOCATION (x
), x
);
4998 /* Detect and ignore out of range field width and process valid
5000 if (DECL_INITIAL (x
))
5003 = (TYPE_MAIN_VARIANT (TREE_TYPE (x
)) == boolean_type_node
5004 ? CHAR_TYPE_SIZE
: TYPE_PRECISION (TREE_TYPE (x
)));
5006 if (tree_int_cst_sgn (DECL_INITIAL (x
)) < 0)
5007 error ("%Hnegative width in bit-field '%D'",
5008 &DECL_SOURCE_LOCATION (x
), x
);
5009 else if (0 < compare_tree_int (DECL_INITIAL (x
), max_width
))
5010 pedwarn ("%Hwidth of '%D' exceeds its type",
5011 &DECL_SOURCE_LOCATION (x
), x
);
5012 else if (integer_zerop (DECL_INITIAL (x
)) && DECL_NAME (x
) != 0)
5013 error ("%Hzero width for bit-field '%D'",
5014 &DECL_SOURCE_LOCATION (x
), x
);
5017 /* The test above has assured us that TREE_INT_CST_HIGH is 0. */
5018 unsigned HOST_WIDE_INT width
5019 = tree_low_cst (DECL_INITIAL (x
), 1);
5021 if (TREE_CODE (TREE_TYPE (x
)) == ENUMERAL_TYPE
5022 && (width
< min_precision (TYPE_MIN_VALUE (TREE_TYPE (x
)),
5023 TREE_UNSIGNED (TREE_TYPE (x
)))
5025 < min_precision (TYPE_MAX_VALUE (TREE_TYPE (x
)),
5026 TREE_UNSIGNED (TREE_TYPE (x
))))))
5027 warning ("%H'%D' is narrower than values of its type",
5028 &DECL_SOURCE_LOCATION (x
), x
);
5030 DECL_SIZE (x
) = bitsize_int (width
);
5031 DECL_BIT_FIELD (x
) = 1;
5032 SET_DECL_C_BIT_FIELD (x
);
5036 DECL_INITIAL (x
) = 0;
5038 /* Detect flexible array member in an invalid context. */
5039 if (TREE_CODE (TREE_TYPE (x
)) == ARRAY_TYPE
5040 && TYPE_SIZE (TREE_TYPE (x
)) == NULL_TREE
5041 && TYPE_DOMAIN (TREE_TYPE (x
)) != NULL_TREE
5042 && TYPE_MAX_VALUE (TYPE_DOMAIN (TREE_TYPE (x
))) == NULL_TREE
)
5044 if (TREE_CODE (t
) == UNION_TYPE
)
5045 error ("%Hflexible array member in union",
5046 &DECL_SOURCE_LOCATION (x
));
5047 else if (TREE_CHAIN (x
) != NULL_TREE
)
5048 error ("%Hflexible array member not at end of struct",
5049 &DECL_SOURCE_LOCATION (x
));
5050 else if (! saw_named_field
)
5051 error ("%Hflexible array member in otherwise empty struct",
5052 &DECL_SOURCE_LOCATION (x
));
5055 if (pedantic
&& TREE_CODE (t
) == RECORD_TYPE
5056 && flexible_array_type_p (TREE_TYPE (x
)))
5057 pedwarn ("%Hinvalid use of structure with flexible array member",
5058 &DECL_SOURCE_LOCATION (x
));
5061 saw_named_field
= 1;
5064 detect_field_duplicates (fieldlist
);
5066 /* Now we have the nearly final fieldlist. Record it,
5067 then lay out the structure or union (including the fields). */
5069 TYPE_FIELDS (t
) = fieldlist
;
5073 /* Delete all zero-width bit-fields from the fieldlist */
5075 tree
*fieldlistp
= &fieldlist
;
5077 if (TREE_CODE (*fieldlistp
) == FIELD_DECL
&& DECL_INITIAL (*fieldlistp
))
5078 *fieldlistp
= TREE_CHAIN (*fieldlistp
);
5080 fieldlistp
= &TREE_CHAIN (*fieldlistp
);
5083 /* Now we have the truly final field list.
5084 Store it in this type and in the variants. */
5086 TYPE_FIELDS (t
) = fieldlist
;
5088 /* If there are lots of fields, sort so we can look through them fast.
5089 We arbitrarily consider 16 or more elts to be "a lot". */
5094 for (x
= fieldlist
; x
; x
= TREE_CHAIN (x
))
5096 if (len
> 15 || DECL_NAME (x
) == NULL
)
5104 struct lang_type
*space
;
5105 struct sorted_fields_type
*space2
;
5107 len
+= list_length (x
);
5109 /* Use the same allocation policy here that make_node uses, to
5110 ensure that this lives as long as the rest of the struct decl.
5111 All decls in an inline function need to be saved. */
5113 space
= ggc_alloc (sizeof (struct lang_type
));
5114 space2
= ggc_alloc (sizeof (struct sorted_fields_type
) + len
* sizeof (tree
));
5118 field_array
= &space2
->elts
[0];
5119 for (x
= fieldlist
; x
; x
= TREE_CHAIN (x
))
5121 field_array
[len
++] = x
;
5123 /* If there is anonymous struct or union, break out of the loop. */
5124 if (DECL_NAME (x
) == NULL
)
5127 /* Found no anonymous struct/union. Add the TYPE_LANG_SPECIFIC. */
5130 TYPE_LANG_SPECIFIC (t
) = space
;
5131 TYPE_LANG_SPECIFIC (t
)->s
->len
= len
;
5132 field_array
= TYPE_LANG_SPECIFIC (t
)->s
->elts
;
5133 qsort (field_array
, len
, sizeof (tree
), field_decl_cmp
);
5138 for (x
= TYPE_MAIN_VARIANT (t
); x
; x
= TYPE_NEXT_VARIANT (x
))
5140 TYPE_FIELDS (x
) = TYPE_FIELDS (t
);
5141 TYPE_LANG_SPECIFIC (x
) = TYPE_LANG_SPECIFIC (t
);
5142 TYPE_ALIGN (x
) = TYPE_ALIGN (t
);
5143 TYPE_USER_ALIGN (x
) = TYPE_USER_ALIGN (t
);
5146 /* If this was supposed to be a transparent union, but we can't
5147 make it one, warn and turn off the flag. */
5148 if (TREE_CODE (t
) == UNION_TYPE
5149 && TYPE_TRANSPARENT_UNION (t
)
5150 && TYPE_MODE (t
) != DECL_MODE (TYPE_FIELDS (t
)))
5152 TYPE_TRANSPARENT_UNION (t
) = 0;
5153 warning ("union cannot be made transparent");
5156 /* If this structure or union completes the type of any previous
5157 variable declaration, lay it out and output its rtl. */
5159 if (current_scope
->incomplete
!= NULL_TREE
)
5161 tree prev
= NULL_TREE
;
5163 for (x
= current_scope
->incomplete
; x
; x
= TREE_CHAIN (x
))
5165 tree decl
= TREE_VALUE (x
);
5167 if (TYPE_MAIN_VARIANT (TREE_TYPE (decl
)) == TYPE_MAIN_VARIANT (t
)
5168 && TREE_CODE (decl
) != TYPE_DECL
)
5170 layout_decl (decl
, 0);
5171 /* This is a no-op in c-lang.c or something real in objc-act.c. */
5172 if (c_dialect_objc ())
5173 objc_check_decl (decl
);
5174 rest_of_decl_compilation (decl
, NULL
, toplevel
, 0);
5177 /* Unlink X from the incomplete list. */
5179 TREE_CHAIN (prev
) = TREE_CHAIN (x
);
5181 current_scope
->incomplete
= TREE_CHAIN (x
);
5183 else if (!COMPLETE_TYPE_P (TREE_TYPE (decl
))
5184 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
)
5186 tree element
= TREE_TYPE (decl
);
5187 while (TREE_CODE (element
) == ARRAY_TYPE
)
5188 element
= TREE_TYPE (element
);
5191 layout_array_type (TREE_TYPE (decl
));
5192 if (TREE_CODE (decl
) != TYPE_DECL
)
5194 layout_decl (decl
, 0);
5195 if (c_dialect_objc ())
5196 objc_check_decl (decl
);
5197 rest_of_decl_compilation (decl
, NULL
, toplevel
, 0);
5201 /* Unlink X from the incomplete list. */
5203 TREE_CHAIN (prev
) = TREE_CHAIN (x
);
5205 current_scope
->incomplete
= TREE_CHAIN (x
);
5211 /* Finish debugging output for this type. */
5212 rest_of_type_compilation (t
, toplevel
);
5217 /* Lay out the type T, and its element type, and so on. */
5220 layout_array_type (tree t
)
5222 if (TREE_CODE (TREE_TYPE (t
)) == ARRAY_TYPE
)
5223 layout_array_type (TREE_TYPE (t
));
5227 /* Begin compiling the definition of an enumeration type.
5228 NAME is its name (or null if anonymous).
5229 Returns the type object, as yet incomplete.
5230 Also records info about it so that build_enumerator
5231 may be used to declare the individual values as they are read. */
5234 start_enum (tree name
)
5238 /* If this is the real definition for a previous forward reference,
5239 fill in the contents in the same object that used to be the
5240 forward reference. */
5243 enumtype
= lookup_tag (ENUMERAL_TYPE
, name
, 1);
5245 if (enumtype
== 0 || TREE_CODE (enumtype
) != ENUMERAL_TYPE
)
5247 enumtype
= make_node (ENUMERAL_TYPE
);
5248 pushtag (name
, enumtype
);
5251 C_TYPE_BEING_DEFINED (enumtype
) = 1;
5253 if (TYPE_VALUES (enumtype
) != 0)
5255 /* This enum is a named one that has been declared already. */
5256 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name
));
5258 /* Completely replace its old definition.
5259 The old enumerators remain defined, however. */
5260 TYPE_VALUES (enumtype
) = 0;
5263 enum_next_value
= integer_zero_node
;
5266 if (flag_short_enums
)
5267 TYPE_PACKED (enumtype
) = 1;
5272 /* After processing and defining all the values of an enumeration type,
5273 install their decls in the enumeration type and finish it off.
5274 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5275 and ATTRIBUTES are the specified attributes.
5276 Returns ENUMTYPE. */
5279 finish_enum (tree enumtype
, tree values
, tree attributes
)
5282 tree minnode
= 0, maxnode
= 0, enum_value_type
;
5283 int precision
, unsign
;
5284 int toplevel
= (global_scope
== current_scope
);
5286 if (in_parm_level_p ())
5287 warning ("enum defined inside parms");
5289 decl_attributes (&enumtype
, attributes
, (int) ATTR_FLAG_TYPE_IN_PLACE
);
5291 /* Calculate the maximum value of any enumerator in this type. */
5293 if (values
== error_mark_node
)
5294 minnode
= maxnode
= integer_zero_node
;
5297 minnode
= maxnode
= TREE_VALUE (values
);
5298 for (pair
= TREE_CHAIN (values
); pair
; pair
= TREE_CHAIN (pair
))
5300 tree value
= TREE_VALUE (pair
);
5301 if (tree_int_cst_lt (maxnode
, value
))
5303 if (tree_int_cst_lt (value
, minnode
))
5308 /* Construct the final type of this enumeration. It is the same
5309 as one of the integral types - the narrowest one that fits, except
5310 that normally we only go as narrow as int - and signed iff any of
5311 the values are negative. */
5312 unsign
= (tree_int_cst_sgn (minnode
) >= 0);
5313 precision
= MAX (min_precision (minnode
, unsign
),
5314 min_precision (maxnode
, unsign
));
5315 if (TYPE_PACKED (enumtype
) || precision
> TYPE_PRECISION (integer_type_node
))
5317 tree narrowest
= c_common_type_for_size (precision
, unsign
);
5320 warning ("enumeration values exceed range of largest integer");
5321 narrowest
= long_long_integer_type_node
;
5324 precision
= TYPE_PRECISION (narrowest
);
5327 precision
= TYPE_PRECISION (integer_type_node
);
5329 if (precision
== TYPE_PRECISION (integer_type_node
))
5330 enum_value_type
= c_common_type_for_size (precision
, 0);
5332 enum_value_type
= enumtype
;
5334 TYPE_MIN_VALUE (enumtype
) = minnode
;
5335 TYPE_MAX_VALUE (enumtype
) = maxnode
;
5336 TYPE_PRECISION (enumtype
) = precision
;
5337 TREE_UNSIGNED (enumtype
) = unsign
;
5338 TYPE_SIZE (enumtype
) = 0;
5339 layout_type (enumtype
);
5341 if (values
!= error_mark_node
)
5343 /* Change the type of the enumerators to be the enum type. We
5344 need to do this irrespective of the size of the enum, for
5345 proper type checking. Replace the DECL_INITIALs of the
5346 enumerators, and the value slots of the list, with copies
5347 that have the enum type; they cannot be modified in place
5348 because they may be shared (e.g. integer_zero_node) Finally,
5349 change the purpose slots to point to the names of the decls. */
5350 for (pair
= values
; pair
; pair
= TREE_CHAIN (pair
))
5352 tree enu
= TREE_PURPOSE (pair
);
5354 TREE_TYPE (enu
) = enumtype
;
5356 /* The ISO C Standard mandates enumerators to have type int,
5357 even though the underlying type of an enum type is
5358 unspecified. Here we convert any enumerators that fit in
5359 an int to type int, to avoid promotions to unsigned types
5360 when comparing integers with enumerators that fit in the
5361 int range. When -pedantic is given, build_enumerator()
5362 would have already taken care of those that don't fit. */
5363 if (int_fits_type_p (DECL_INITIAL (enu
), enum_value_type
))
5364 DECL_INITIAL (enu
) = convert (enum_value_type
, DECL_INITIAL (enu
));
5366 DECL_INITIAL (enu
) = convert (enumtype
, DECL_INITIAL (enu
));
5368 TREE_PURPOSE (pair
) = DECL_NAME (enu
);
5369 TREE_VALUE (pair
) = DECL_INITIAL (enu
);
5372 TYPE_VALUES (enumtype
) = values
;
5375 /* Fix up all variant types of this enum type. */
5376 for (tem
= TYPE_MAIN_VARIANT (enumtype
); tem
; tem
= TYPE_NEXT_VARIANT (tem
))
5378 if (tem
== enumtype
)
5380 TYPE_VALUES (tem
) = TYPE_VALUES (enumtype
);
5381 TYPE_MIN_VALUE (tem
) = TYPE_MIN_VALUE (enumtype
);
5382 TYPE_MAX_VALUE (tem
) = TYPE_MAX_VALUE (enumtype
);
5383 TYPE_SIZE (tem
) = TYPE_SIZE (enumtype
);
5384 TYPE_SIZE_UNIT (tem
) = TYPE_SIZE_UNIT (enumtype
);
5385 TYPE_MODE (tem
) = TYPE_MODE (enumtype
);
5386 TYPE_PRECISION (tem
) = TYPE_PRECISION (enumtype
);
5387 TYPE_ALIGN (tem
) = TYPE_ALIGN (enumtype
);
5388 TYPE_USER_ALIGN (tem
) = TYPE_USER_ALIGN (enumtype
);
5389 TREE_UNSIGNED (tem
) = TREE_UNSIGNED (enumtype
);
5392 /* Finish debugging output for this type. */
5393 rest_of_type_compilation (enumtype
, toplevel
);
5398 /* Build and install a CONST_DECL for one value of the
5399 current enumeration type (one that was begun with start_enum).
5400 Return a tree-list containing the CONST_DECL and its value.
5401 Assignment of sequential values by default is handled here. */
5404 build_enumerator (tree name
, tree value
)
5408 /* Validate and default VALUE. */
5410 /* Remove no-op casts from the value. */
5412 STRIP_TYPE_NOPS (value
);
5416 if (TREE_CODE (value
) == INTEGER_CST
)
5418 value
= default_conversion (value
);
5419 constant_expression_warning (value
);
5423 error ("enumerator value for `%s' not integer constant",
5424 IDENTIFIER_POINTER (name
));
5429 /* Default based on previous value. */
5430 /* It should no longer be possible to have NON_LVALUE_EXPR
5434 value
= enum_next_value
;
5436 error ("overflow in enumeration values");
5439 if (pedantic
&& ! int_fits_type_p (value
, integer_type_node
))
5441 pedwarn ("ISO C restricts enumerator values to range of `int'");
5442 value
= convert (integer_type_node
, value
);
5445 /* Set basis for default for next value. */
5446 enum_next_value
= build_binary_op (PLUS_EXPR
, value
, integer_one_node
, 0);
5447 enum_overflow
= tree_int_cst_lt (enum_next_value
, value
);
5449 /* Now create a declaration for the enum value name. */
5451 type
= TREE_TYPE (value
);
5452 type
= c_common_type_for_size (MAX (TYPE_PRECISION (type
),
5453 TYPE_PRECISION (integer_type_node
)),
5454 (TYPE_PRECISION (type
)
5455 >= TYPE_PRECISION (integer_type_node
)
5456 && TREE_UNSIGNED (type
)));
5458 decl
= build_decl (CONST_DECL
, name
, type
);
5459 DECL_INITIAL (decl
) = convert (type
, value
);
5462 return tree_cons (decl
, value
, NULL_TREE
);
5466 /* Create the FUNCTION_DECL for a function definition.
5467 DECLSPECS, DECLARATOR and ATTRIBUTES are the parts of
5468 the declaration; they describe the function's name and the type it returns,
5469 but twisted together in a fashion that parallels the syntax of C.
5471 This function creates a binding context for the function body
5472 as well as setting up the FUNCTION_DECL in current_function_decl.
5474 Returns 1 on success. If the DECLARATOR is not suitable for a function
5475 (it defines a datum instead), we return 0, which tells
5476 yyparse to report a parse error. */
5479 start_function (tree declspecs
, tree declarator
, tree attributes
)
5481 tree decl1
, old_decl
;
5483 int old_immediate_size_expand
= immediate_size_expand
;
5485 current_function_returns_value
= 0; /* Assume, until we see it does. */
5486 current_function_returns_null
= 0;
5487 current_function_returns_abnormally
= 0;
5488 warn_about_return_type
= 0;
5489 current_extern_inline
= 0;
5491 /* Don't expand any sizes in the return type of the function. */
5492 immediate_size_expand
= 0;
5494 decl1
= grokdeclarator (declarator
, declspecs
, FUNCDEF
, 1);
5496 /* If the declarator is not suitable for a function definition,
5497 cause a syntax error. */
5500 immediate_size_expand
= old_immediate_size_expand
;
5504 decl_attributes (&decl1
, attributes
, 0);
5506 if (DECL_DECLARED_INLINE_P (decl1
)
5507 && DECL_UNINLINABLE (decl1
)
5508 && lookup_attribute ("noinline", DECL_ATTRIBUTES (decl1
)))
5509 warning ("%Hinline function '%D' given attribute noinline",
5510 &DECL_SOURCE_LOCATION (decl1
), decl1
);
5512 announce_function (decl1
);
5514 if (!COMPLETE_OR_VOID_TYPE_P (TREE_TYPE (TREE_TYPE (decl1
))))
5516 error ("return type is an incomplete type");
5517 /* Make it return void instead. */
5519 = build_function_type (void_type_node
,
5520 TYPE_ARG_TYPES (TREE_TYPE (decl1
)));
5523 if (warn_about_return_type
)
5524 pedwarn_c99 ("return type defaults to `int'");
5526 /* Save the parm names or decls from this function's declarator
5527 where store_parm_decls will find them. */
5528 current_function_parms
= last_function_parms
;
5529 current_function_parm_tags
= last_function_parm_tags
;
5530 current_function_parm_others
= last_function_parm_others
;
5532 /* Make the init_value nonzero so pushdecl knows this is not tentative.
5533 error_mark_node is replaced below (in poplevel) with the BLOCK. */
5534 DECL_INITIAL (decl1
) = error_mark_node
;
5536 /* If this definition isn't a prototype and we had a prototype declaration
5537 before, copy the arg type info from that prototype.
5538 But not if what we had before was a builtin function. */
5539 old_decl
= lookup_name_current_level (DECL_NAME (decl1
));
5540 if (old_decl
!= 0 && TREE_CODE (TREE_TYPE (old_decl
)) == FUNCTION_TYPE
5541 && !DECL_BUILT_IN (old_decl
)
5542 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1
)))
5543 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl
))))
5544 && TYPE_ARG_TYPES (TREE_TYPE (decl1
)) == 0)
5546 TREE_TYPE (decl1
) = TREE_TYPE (old_decl
);
5547 current_function_prototype_locus
= DECL_SOURCE_LOCATION (old_decl
);
5550 /* Optionally warn of old-fashioned def with no previous prototype. */
5551 if (warn_strict_prototypes
5552 && TYPE_ARG_TYPES (TREE_TYPE (decl1
)) == 0
5553 && C_DECL_ISNT_PROTOTYPE (old_decl
))
5554 warning ("function declaration isn't a prototype");
5555 /* Optionally warn of any global def with no previous prototype. */
5556 else if (warn_missing_prototypes
5557 && TREE_PUBLIC (decl1
)
5558 && ! MAIN_NAME_P (DECL_NAME (decl1
))
5559 && C_DECL_ISNT_PROTOTYPE (old_decl
))
5560 warning ("%Hno previous prototype for '%D'",
5561 &DECL_SOURCE_LOCATION (decl1
), decl1
);
5562 /* Optionally warn of any def with no previous prototype
5563 if the function has already been used. */
5564 else if (warn_missing_prototypes
5565 && old_decl
!= 0 && TREE_USED (old_decl
)
5566 && TYPE_ARG_TYPES (TREE_TYPE (old_decl
)) == 0)
5567 warning ("%H'%D' was used with no prototype before its definition",
5568 &DECL_SOURCE_LOCATION (decl1
), decl1
);
5569 /* Optionally warn of any global def with no previous declaration. */
5570 else if (warn_missing_declarations
5571 && TREE_PUBLIC (decl1
)
5573 && ! MAIN_NAME_P (DECL_NAME (decl1
)))
5574 warning ("%Hno previous declaration for '%D'",
5575 &DECL_SOURCE_LOCATION (decl1
), decl1
);
5576 /* Optionally warn of any def with no previous declaration
5577 if the function has already been used. */
5578 else if (warn_missing_declarations
5579 && old_decl
!= 0 && TREE_USED (old_decl
)
5580 && C_DECL_IMPLICIT (old_decl
))
5581 warning ("%H`%D' was used with no declaration before its definition",
5582 &DECL_SOURCE_LOCATION (decl1
), decl1
);
5584 /* This is a definition, not a reference.
5585 So normally clear DECL_EXTERNAL.
5586 However, `extern inline' acts like a declaration
5587 except for defining how to inline. So set DECL_EXTERNAL in that case. */
5588 DECL_EXTERNAL (decl1
) = current_extern_inline
;
5590 /* This function exists in static storage.
5591 (This does not mean `static' in the C sense!) */
5592 TREE_STATIC (decl1
) = 1;
5594 /* A nested function is not global. */
5595 if (current_function_decl
!= 0)
5596 TREE_PUBLIC (decl1
) = 0;
5598 #ifdef ENABLE_CHECKING
5599 /* This is the earliest point at which we might know the assembler
5600 name of the function. Thus, if it's set before this, die horribly. */
5601 if (DECL_ASSEMBLER_NAME_SET_P (decl1
))
5605 /* If #pragma weak was used, mark the decl weak now. */
5606 if (current_scope
== global_scope
)
5607 maybe_apply_pragma_weak (decl1
);
5609 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
5610 if (warn_main
> 0 && MAIN_NAME_P (DECL_NAME (decl1
)))
5614 const location_t
*locus
= &DECL_SOURCE_LOCATION (decl1
);
5616 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1
)))
5617 != integer_type_node
)
5618 pedwarn ("%Hreturn type of '%D' is not `int'", locus
, decl1
);
5620 for (args
= TYPE_ARG_TYPES (TREE_TYPE (decl1
)); args
;
5621 args
= TREE_CHAIN (args
))
5623 tree type
= args
? TREE_VALUE (args
) : 0;
5625 if (type
== void_type_node
)
5632 if (TYPE_MAIN_VARIANT (type
) != integer_type_node
)
5633 pedwarn ("%Hfirst argument of '%D' should be `int'",
5638 if (TREE_CODE (type
) != POINTER_TYPE
5639 || TREE_CODE (TREE_TYPE (type
)) != POINTER_TYPE
5640 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type
)))
5642 pedwarn ("%Hsecond argument of '%D' should be 'char **'",
5647 if (TREE_CODE (type
) != POINTER_TYPE
5648 || TREE_CODE (TREE_TYPE (type
)) != POINTER_TYPE
5649 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type
)))
5651 pedwarn ("%Hthird argument of '%D' should probably be "
5652 "'char **'", locus
, decl1
);
5657 /* It is intentional that this message does not mention the third
5658 argument because it's only mentioned in an appendix of the
5660 if (argct
> 0 && (argct
< 2 || argct
> 3))
5661 pedwarn ("%H'%D' takes only zero or two arguments", locus
, decl1
);
5663 if (! TREE_PUBLIC (decl1
))
5664 pedwarn ("%H'%D' is normally a non-static function", locus
, decl1
);
5667 /* Record the decl so that the function name is defined.
5668 If we already have a decl for this name, and it is a FUNCTION_DECL,
5669 use the old decl. */
5671 current_function_decl
= pushdecl (decl1
);
5674 declare_parm_level ();
5676 make_decl_rtl (current_function_decl
, NULL
);
5678 restype
= TREE_TYPE (TREE_TYPE (current_function_decl
));
5679 /* Promote the value to int before returning it. */
5680 if (c_promoting_integer_type_p (restype
))
5682 /* It retains unsignedness if not really getting wider. */
5683 if (TREE_UNSIGNED (restype
)
5684 && (TYPE_PRECISION (restype
)
5685 == TYPE_PRECISION (integer_type_node
)))
5686 restype
= unsigned_type_node
;
5688 restype
= integer_type_node
;
5690 DECL_RESULT (current_function_decl
)
5691 = build_decl (RESULT_DECL
, NULL_TREE
, restype
);
5693 /* If this fcn was already referenced via a block-scope `extern' decl
5694 (or an implicit decl), propagate certain information about the usage. */
5695 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl
)))
5696 TREE_ADDRESSABLE (current_function_decl
) = 1;
5698 immediate_size_expand
= old_immediate_size_expand
;
5700 start_fname_decls ();
5705 /* Subroutine of store_parm_decls which handles new-style function
5706 definitions (prototype format). The parms already have decls, so we
5707 need only record them as in effect and complain if any redundant
5708 old-style parm decls were written. */
5710 store_parm_decls_newstyle (void)
5713 tree fndecl
= current_function_decl
;
5714 tree parms
= current_function_parms
;
5715 tree tags
= current_function_parm_tags
;
5716 tree others
= current_function_parm_others
;
5718 if (current_scope
->parms
|| current_scope
->names
|| current_scope
->tags
)
5720 error ("%Hold-style parameter declarations in prototyped "
5721 "function definition", &DECL_SOURCE_LOCATION (fndecl
));
5723 /* Get rid of the old-style declarations. */
5728 /* Now make all the parameter declarations visible in the function body.
5729 We can bypass most of the grunt work of pushdecl. */
5730 for (last
= 0, decl
= parms
; decl
; last
= decl
, decl
= TREE_CHAIN (decl
))
5732 DECL_CONTEXT (decl
) = current_function_decl
;
5733 if (DECL_NAME (decl
) == 0)
5734 error ("%Hparameter name omitted", &DECL_SOURCE_LOCATION (decl
));
5737 if (IDENTIFIER_SYMBOL_VALUE (DECL_NAME (decl
)))
5738 current_scope
->shadowed
5739 = tree_cons (DECL_NAME (decl
),
5740 IDENTIFIER_SYMBOL_VALUE (DECL_NAME (decl
)),
5741 current_scope
->shadowed
);
5742 IDENTIFIER_SYMBOL_VALUE (DECL_NAME (decl
)) = decl
;
5745 current_scope
->parms
= parms
;
5746 current_scope
->parms_last
= last
;
5748 /* Record the parameter list in the function declaration. */
5749 DECL_ARGUMENTS (fndecl
) = parms
;
5751 /* Now make all the ancillary declarations visible, likewise. */
5752 for (last
= 0, decl
= others
; decl
; last
= decl
, decl
= TREE_CHAIN (decl
))
5754 DECL_CONTEXT (decl
) = current_function_decl
;
5755 if (DECL_NAME (decl
)
5756 && TYPE_MAIN_VARIANT (TREE_TYPE (decl
)) != void_type_node
)
5758 if (IDENTIFIER_SYMBOL_VALUE (DECL_NAME (decl
)))
5759 current_scope
->shadowed
5760 = tree_cons (DECL_NAME (decl
),
5761 IDENTIFIER_SYMBOL_VALUE (DECL_NAME (decl
)),
5762 current_scope
->shadowed
);
5763 IDENTIFIER_SYMBOL_VALUE (DECL_NAME (decl
)) = decl
;
5766 current_scope
->names
= others
;
5767 current_scope
->names_last
= last
;
5769 /* And all the tag declarations. */
5770 for (decl
= tags
; decl
; decl
= TREE_CHAIN (decl
))
5771 if (TREE_PURPOSE (decl
))
5773 if (IDENTIFIER_TAG_VALUE (TREE_PURPOSE (decl
)))
5774 current_scope
->shadowed_tags
5775 = tree_cons (TREE_PURPOSE (decl
),
5776 IDENTIFIER_SYMBOL_VALUE (TREE_PURPOSE (decl
)),
5777 current_scope
->shadowed_tags
);
5778 IDENTIFIER_TAG_VALUE (TREE_PURPOSE (decl
)) = TREE_VALUE (decl
);
5780 current_scope
->tags
= tags
;
5783 /* Subroutine of store_parm_decls which handles old-style function
5784 definitions (separate parameter list and declarations). */
5787 store_parm_decls_oldstyle (void)
5789 tree parm
, decl
, last
;
5790 tree fndecl
= current_function_decl
;
5792 /* This is the identifier list from the function declarator. */
5793 tree parmids
= current_function_parms
;
5795 /* We use DECL_WEAK as a flag to show which parameters have been
5796 seen already, since it is not used on PARM_DECL. */
5797 #ifdef ENABLE_CHECKING
5798 for (parm
= current_scope
->parms
; parm
; parm
= TREE_CHAIN (parm
))
5799 if (DECL_WEAK (parm
))
5803 /* Match each formal parameter name with its declaration. Save each
5804 decl in the appropriate TREE_PURPOSE slot of the parmids chain. */
5805 for (parm
= parmids
; parm
; parm
= TREE_CHAIN (parm
))
5807 if (TREE_VALUE (parm
) == 0)
5809 error ("%Hparameter name missing from parameter list",
5810 &DECL_SOURCE_LOCATION (fndecl
));
5811 TREE_PURPOSE (parm
) = 0;
5815 decl
= IDENTIFIER_SYMBOL_VALUE (TREE_VALUE (parm
));
5816 if (decl
&& DECL_CONTEXT (decl
) == fndecl
)
5818 const location_t
*locus
= &DECL_SOURCE_LOCATION (decl
);
5819 /* If we got something other than a PARM_DECL it is an error. */
5820 if (TREE_CODE (decl
) != PARM_DECL
)
5821 error ("%H\"%D\" declared as a non-parameter", locus
, decl
);
5822 /* If the declaration is already marked, we have a duplicate
5823 name. Complain and ignore the duplicate. */
5824 else if (DECL_WEAK (decl
))
5826 error ("%Hmultiple parameters named \"%D\"", locus
, decl
);
5827 TREE_PURPOSE (parm
) = 0;
5830 /* If the declaration says "void", complain and turn it into
5832 else if (VOID_TYPE_P (TREE_TYPE (decl
)))
5834 error ("%Hparameter \"%D\" declared void", locus
, decl
);
5835 TREE_TYPE (decl
) = integer_type_node
;
5836 DECL_ARG_TYPE (decl
) = integer_type_node
;
5837 layout_decl (decl
, 0);
5840 /* If no declaration found, default to int. */
5843 const location_t
*locus
= &DECL_SOURCE_LOCATION (fndecl
);
5844 decl
= build_decl (PARM_DECL
, TREE_VALUE (parm
), integer_type_node
);
5845 DECL_ARG_TYPE (decl
) = TREE_TYPE (decl
);
5846 DECL_SOURCE_LOCATION (decl
) = *locus
;
5850 pedwarn ("%Htype of \"%D\" defaults to \"int\"", locus
, decl
);
5851 else if (extra_warnings
)
5852 warning ("%Htype of \"%D\" defaults to \"int\"", locus
, decl
);
5855 TREE_PURPOSE (parm
) = decl
;
5856 DECL_WEAK (decl
) = 1;
5859 /* Now examine the parms chain for incomplete declarations
5860 and declarations with no corresponding names. */
5862 for (parm
= current_scope
->parms
; parm
; parm
= TREE_CHAIN (parm
))
5864 const location_t
*locus
= &DECL_SOURCE_LOCATION (parm
);
5866 if (!COMPLETE_TYPE_P (TREE_TYPE (parm
)))
5868 error ("%Hparameter \"%D\" has incomplete type", locus
, parm
);
5869 TREE_TYPE (parm
) = error_mark_node
;
5872 if (! DECL_WEAK (parm
))
5874 error ("%Hdeclaration for parameter \"%D\" but no such parameter",
5877 /* Pretend the parameter was not missing.
5878 This gets us to a standard state and minimizes
5879 further error messages. */
5880 parmids
= chainon (parmids
, tree_cons (parm
, 0, 0));
5884 /* Chain the declarations together in the order of the list of
5885 names. Store that chain in the function decl, replacing the
5886 list of names. Update the current scope to match. */
5887 DECL_ARGUMENTS (fndecl
) = 0;
5889 for (parm
= parmids
; parm
; parm
= TREE_CHAIN (parm
))
5890 if (TREE_PURPOSE (parm
))
5892 if (parm
&& TREE_PURPOSE (parm
))
5894 last
= TREE_PURPOSE (parm
);
5895 DECL_ARGUMENTS (fndecl
) = last
;
5896 current_scope
->parms
= last
;
5897 DECL_WEAK (last
) = 0;
5899 for (parm
= TREE_CHAIN (parm
); parm
; parm
= TREE_CHAIN (parm
))
5900 if (TREE_PURPOSE (parm
))
5902 TREE_CHAIN (last
) = TREE_PURPOSE (parm
);
5903 last
= TREE_PURPOSE (parm
);
5904 DECL_WEAK (last
) = 0;
5906 current_scope
->parms_last
= last
;
5907 TREE_CHAIN (last
) = 0;
5910 /* If there was a previous prototype,
5911 set the DECL_ARG_TYPE of each argument according to
5912 the type previously specified, and report any mismatches. */
5914 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl
)))
5917 for (parm
= DECL_ARGUMENTS (fndecl
),
5918 type
= TYPE_ARG_TYPES (TREE_TYPE (fndecl
));
5919 parm
|| (type
&& (TYPE_MAIN_VARIANT (TREE_VALUE (type
))
5920 != void_type_node
));
5921 parm
= TREE_CHAIN (parm
), type
= TREE_CHAIN (type
))
5923 if (parm
== 0 || type
== 0
5924 || TYPE_MAIN_VARIANT (TREE_VALUE (type
)) == void_type_node
)
5926 error ("number of arguments doesn't match prototype");
5927 error ("%Hprototype declaration",
5928 ¤t_function_prototype_locus
);
5931 /* Type for passing arg must be consistent with that
5932 declared for the arg. ISO C says we take the unqualified
5933 type for parameters declared with qualified type. */
5934 if (! comptypes (TYPE_MAIN_VARIANT (DECL_ARG_TYPE (parm
)),
5935 TYPE_MAIN_VARIANT (TREE_VALUE (type
)),
5938 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm
))
5939 == TYPE_MAIN_VARIANT (TREE_VALUE (type
)))
5941 /* Adjust argument to match prototype. E.g. a previous
5942 `int foo(float);' prototype causes
5943 `int foo(x) float x; {...}' to be treated like
5944 `int foo(float x) {...}'. This is particularly
5945 useful for argument types like uid_t. */
5946 DECL_ARG_TYPE (parm
) = TREE_TYPE (parm
);
5948 if (PROMOTE_PROTOTYPES
5949 && INTEGRAL_TYPE_P (TREE_TYPE (parm
))
5950 && TYPE_PRECISION (TREE_TYPE (parm
))
5951 < TYPE_PRECISION (integer_type_node
))
5952 DECL_ARG_TYPE (parm
) = integer_type_node
;
5956 pedwarn ("promoted argument \"%D\" "
5957 "doesn't match prototype", parm
);
5958 pedwarn ("%Hprototype declaration",
5959 ¤t_function_prototype_locus
);
5964 error ("argument \"%D\" doesn't match prototype", parm
);
5965 error ("%Hprototype declaration",
5966 ¤t_function_prototype_locus
);
5970 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl
)) = 0;
5973 /* Otherwise, create a prototype that would match. */
5977 tree actual
= 0, last
= 0, type
;
5979 for (parm
= DECL_ARGUMENTS (fndecl
); parm
; parm
= TREE_CHAIN (parm
))
5981 type
= tree_cons (NULL_TREE
, DECL_ARG_TYPE (parm
), NULL_TREE
);
5983 TREE_CHAIN (last
) = type
;
5988 type
= tree_cons (NULL_TREE
, void_type_node
, NULL_TREE
);
5990 TREE_CHAIN (last
) = type
;
5994 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
5995 of the type of this function, but we need to avoid having this
5996 affect the types of other similarly-typed functions, so we must
5997 first force the generation of an identical (but separate) type
5998 node for the relevant function type. The new node we create
5999 will be a variant of the main variant of the original function
6002 TREE_TYPE (fndecl
) = build_type_copy (TREE_TYPE (fndecl
));
6004 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl
)) = actual
;
6008 /* Store the parameter declarations into the current function declaration.
6009 This is called after parsing the parameter declarations, before
6010 digesting the body of the function.
6012 For an old-style definition, construct a prototype out of the old-style
6013 parameter declarations and inject it into the function's type. */
6016 store_parm_decls (void)
6018 tree fndecl
= current_function_decl
;
6020 /* The function containing FNDECL, if any. */
6021 tree context
= decl_function_context (fndecl
);
6023 /* True if this definition is written with a prototype. */
6024 bool prototype
= (current_function_parms
6025 && TREE_CODE (current_function_parms
) != TREE_LIST
);
6028 store_parm_decls_newstyle ();
6030 store_parm_decls_oldstyle ();
6032 /* The next call to pushlevel will be a function body. */
6034 next_is_function_body
= true;
6036 /* Write a record describing this function definition to the prototypes
6037 file (if requested). */
6039 gen_aux_info_record (fndecl
, 1, 0, prototype
);
6041 /* Initialize the RTL code for the function. */
6042 init_function_start (fndecl
);
6044 /* Begin the statement tree for this function. */
6045 begin_stmt_tree (&DECL_SAVED_TREE (fndecl
));
6047 /* If this is a nested function, save away the sizes of any
6048 variable-size types so that we can expand them when generating
6054 DECL_LANG_SPECIFIC (fndecl
)->pending_sizes
6055 = nreverse (get_pending_sizes ());
6056 for (t
= DECL_LANG_SPECIFIC (fndecl
)->pending_sizes
;
6059 SAVE_EXPR_CONTEXT (TREE_VALUE (t
)) = context
;
6062 /* This function is being processed in whole-function mode. */
6063 cfun
->x_whole_function_mode_p
= 1;
6065 /* Even though we're inside a function body, we still don't want to
6066 call expand_expr to calculate the size of a variable-sized array.
6067 We haven't necessarily assigned RTL to all variables yet, so it's
6068 not safe to try to expand expressions involving them. */
6069 immediate_size_expand
= 0;
6070 cfun
->x_dont_save_pending_sizes_p
= 1;
6073 /* Finish up a function declaration and compile that function
6074 all the way to assembler language output. The free the storage
6075 for the function definition.
6077 This is called after parsing the body of the function definition.
6079 NESTED is nonzero if the function being finished is nested in another.
6080 CAN_DEFER_P is nonzero if the function may be deferred. */
6083 finish_function (int nested
, int can_defer_p
)
6085 tree fndecl
= current_function_decl
;
6087 /* When a function declaration is totally empty, e.g.
6089 (the argument list is irrelevant) the compstmt rule will not
6090 bother calling pushlevel/poplevel, which means we get here with
6091 the scope stack out of sync. Detect this situation by noticing
6092 that current_scope is still as store_parm_decls left it, and do
6093 a dummy push/pop to get back to consistency.
6094 Note that the call to pushlevel does not actually push another
6095 scope - see there for details. */
6097 if (current_scope
->parm_flag
&& next_is_function_body
)
6103 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl
)) = fndecl
;
6105 /* Must mark the RESULT_DECL as being in this function. */
6107 DECL_CONTEXT (DECL_RESULT (fndecl
)) = fndecl
;
6109 if (MAIN_NAME_P (DECL_NAME (fndecl
)) && flag_hosted
)
6111 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl
)))
6112 != integer_type_node
)
6114 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6115 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6117 pedwarn ("%Hreturn type of '%D' is not `int'",
6118 &DECL_SOURCE_LOCATION (fndecl
), fndecl
);
6122 #ifdef DEFAULT_MAIN_RETURN
6123 /* Make it so that `main' always returns success by default. */
6124 DEFAULT_MAIN_RETURN
;
6127 c_expand_return (integer_zero_node
);
6132 finish_fname_decls ();
6134 /* Tie off the statement tree for this function. */
6135 finish_stmt_tree (&DECL_SAVED_TREE (fndecl
));
6137 /* Complain if there's just no return statement. */
6138 if (warn_return_type
6139 && TREE_CODE (TREE_TYPE (TREE_TYPE (fndecl
))) != VOID_TYPE
6140 && !current_function_returns_value
&& !current_function_returns_null
6141 /* Don't complain if we abort. */
6142 && !current_function_returns_abnormally
6143 /* Don't warn for main(). */
6144 && !MAIN_NAME_P (DECL_NAME (fndecl
))
6145 /* Or if they didn't actually specify a return type. */
6146 && !C_FUNCTION_IMPLICIT_INT (fndecl
)
6147 /* Normally, with -Wreturn-type, flow will complain. Unless we're an
6148 inline function, as we might never be compiled separately. */
6149 && DECL_INLINE (fndecl
))
6150 warning ("no return statement in function returning non-void");
6152 /* Clear out memory we no longer need. */
6153 free_after_parsing (cfun
);
6154 /* Since we never call rest_of_compilation, we never clear
6155 CFUN. Do so explicitly. */
6156 free_after_compilation (cfun
);
6159 if (flag_unit_at_a_time
&& can_defer_p
)
6161 cgraph_finalize_function (fndecl
, DECL_SAVED_TREE (fndecl
));
6162 current_function_decl
= NULL
;
6168 /* Function is parsed.
6169 Generate RTL for the body of this function or defer
6170 it for later expansion. */
6171 int uninlinable
= 1;
6173 /* There's no reason to do any of the work here if we're only doing
6174 semantic analysis; this code just generates RTL. */
6175 if (flag_syntax_only
)
6177 current_function_decl
= NULL
;
6178 DECL_SAVED_TREE (fndecl
) = NULL_TREE
;
6182 if (flag_inline_trees
)
6184 /* First, cache whether the current function is inlinable. Some
6185 predicates depend on cfun and current_function_decl to
6186 function completely. */
6187 timevar_push (TV_INTEGRATION
);
6188 uninlinable
= ! tree_inlinable_function_p (fndecl
, 0);
6191 /* We defer functions marked inline *even if* the function
6192 itself is not inlinable. This is because we don't yet
6193 know if the function will actually be used; we may be
6194 able to avoid emitting it entirely. */
6195 && (! uninlinable
|| DECL_DECLARED_INLINE_P (fndecl
))
6196 /* Save function tree for inlining. Should return 0 if the
6197 language does not support function deferring or the
6198 function could not be deferred. */
6199 && defer_fn (fndecl
))
6201 /* Let the back-end know that this function exists. */
6202 (*debug_hooks
->deferred_inline_function
) (fndecl
);
6203 timevar_pop (TV_INTEGRATION
);
6204 current_function_decl
= NULL
;
6208 /* Then, inline any functions called in it. */
6209 optimize_inline_calls (fndecl
);
6210 timevar_pop (TV_INTEGRATION
);
6213 c_expand_body (fndecl
);
6215 /* Keep the function body if it's needed for inlining or dumping. */
6216 if (uninlinable
&& !dump_enabled_p (TDI_all
))
6218 /* Allow the body of the function to be garbage collected. */
6219 DECL_SAVED_TREE (fndecl
) = NULL_TREE
;
6222 /* Let the error reporting routines know that we're outside a
6223 function. For a nested function, this value is used in
6224 c_pop_function_context and then reset via pop_function_context. */
6225 current_function_decl
= NULL
;
6229 /* Generate the RTL for a deferred function FNDECL. */
6232 c_expand_deferred_function (tree fndecl
)
6234 /* DECL_INLINE or DECL_RESULT might got cleared after the inline
6235 function was deferred, e.g. in duplicate_decls. */
6236 if (DECL_INLINE (fndecl
) && DECL_RESULT (fndecl
))
6238 if (flag_inline_trees
)
6240 timevar_push (TV_INTEGRATION
);
6241 optimize_inline_calls (fndecl
);
6242 timevar_pop (TV_INTEGRATION
);
6244 c_expand_body (fndecl
);
6245 current_function_decl
= NULL
;
6249 /* Called to move the SAVE_EXPRs for parameter declarations in a
6250 nested function into the nested function. DATA is really the
6251 nested FUNCTION_DECL. */
6254 set_save_expr_context (tree
*tp
,
6258 if (TREE_CODE (*tp
) == SAVE_EXPR
&& !SAVE_EXPR_CONTEXT (*tp
))
6259 SAVE_EXPR_CONTEXT (*tp
) = (tree
) data
;
6260 /* Do not walk back into the SAVE_EXPR_CONTEXT; that will cause
6262 else if (DECL_P (*tp
))
6268 /* Generate the RTL for the body of FNDECL. If NESTED_P is nonzero,
6269 then we are already in the process of generating RTL for another
6270 function. If can_defer_p is zero, we won't attempt to defer the
6271 generation of RTL. */
6274 c_expand_body_1 (tree fndecl
, int nested_p
)
6276 timevar_push (TV_EXPAND
);
6280 /* Make sure that we will evaluate variable-sized types involved
6281 in our function's type. */
6282 expand_pending_sizes (DECL_LANG_SPECIFIC (fndecl
)->pending_sizes
);
6283 /* Squirrel away our current state. */
6284 push_function_context ();
6287 /* Initialize the RTL code for the function. */
6288 current_function_decl
= fndecl
;
6289 input_location
= DECL_SOURCE_LOCATION (fndecl
);
6290 init_function_start (fndecl
);
6292 /* This function is being processed in whole-function mode. */
6293 cfun
->x_whole_function_mode_p
= 1;
6295 /* Even though we're inside a function body, we still don't want to
6296 call expand_expr to calculate the size of a variable-sized array.
6297 We haven't necessarily assigned RTL to all variables yet, so it's
6298 not safe to try to expand expressions involving them. */
6299 immediate_size_expand
= 0;
6300 cfun
->x_dont_save_pending_sizes_p
= 1;
6302 /* Set up parameters and prepare for return, for the function. */
6303 expand_function_start (fndecl
, 0);
6305 /* If the function has a variably modified type, there may be
6306 SAVE_EXPRs in the parameter types. Their context must be set to
6307 refer to this function; they cannot be expanded in the containing
6309 if (decl_function_context (fndecl
)
6310 && variably_modified_type_p (TREE_TYPE (fndecl
)))
6311 walk_tree (&TREE_TYPE (fndecl
), set_save_expr_context
, fndecl
,
6314 /* If this function is `main', emit a call to `__main'
6315 to run global initializers, etc. */
6316 if (DECL_NAME (fndecl
)
6317 && MAIN_NAME_P (DECL_NAME (fndecl
))
6318 && C_DECL_FILE_SCOPE (fndecl
))
6319 expand_main_function ();
6321 /* Generate the RTL for this function. */
6322 expand_stmt (DECL_SAVED_TREE (fndecl
));
6324 /* We hard-wired immediate_size_expand to zero above.
6325 expand_function_end will decrement this variable. So, we set the
6326 variable to one here, so that after the decrement it will remain
6328 immediate_size_expand
= 1;
6330 /* Allow language dialects to perform special processing. */
6331 if (lang_expand_function_end
)
6332 (*lang_expand_function_end
) ();
6334 /* Generate rtl for function exit. */
6335 expand_function_end ();
6337 /* If this is a nested function, protect the local variables in the stack
6338 above us from being collected while we're compiling this function. */
6340 ggc_push_context ();
6342 /* Run the optimizers and output the assembler code for this function. */
6343 rest_of_compilation (fndecl
);
6345 /* Undo the GC context switch. */
6349 /* With just -Wextra, complain only if function returns both with
6350 and without a value. */
6352 && current_function_returns_value
6353 && current_function_returns_null
)
6354 warning ("this function may return with or without a value");
6356 /* If requested, warn about function definitions where the function will
6357 return a value (usually of some struct or union type) which itself will
6358 take up a lot of stack space. */
6360 if (warn_larger_than
&& !DECL_EXTERNAL (fndecl
) && TREE_TYPE (fndecl
))
6362 tree ret_type
= TREE_TYPE (TREE_TYPE (fndecl
));
6364 if (ret_type
&& TYPE_SIZE_UNIT (ret_type
)
6365 && TREE_CODE (TYPE_SIZE_UNIT (ret_type
)) == INTEGER_CST
6366 && 0 < compare_tree_int (TYPE_SIZE_UNIT (ret_type
),
6369 const location_t
*locus
= &DECL_SOURCE_LOCATION (fndecl
);
6370 unsigned int size_as_int
6371 = TREE_INT_CST_LOW (TYPE_SIZE_UNIT (ret_type
));
6373 if (compare_tree_int (TYPE_SIZE_UNIT (ret_type
), size_as_int
) == 0)
6374 warning ("%Hsize of return value of '%D' is %u bytes",
6375 locus
, fndecl
, size_as_int
);
6377 warning ("%Hsize of return value of '%D' is larger than %wd bytes",
6378 locus
, fndecl
, larger_than_size
);
6382 if (DECL_SAVED_INSNS (fndecl
) == 0 && ! nested_p
6383 && ! flag_inline_trees
)
6385 /* Stop pointing to the local nodes about to be freed.
6386 But DECL_INITIAL must remain nonzero so we know this
6387 was an actual function definition.
6388 For a nested function, this is done in c_pop_function_context.
6389 If rest_of_compilation set this to 0, leave it 0. */
6390 if (DECL_INITIAL (fndecl
) != 0)
6391 DECL_INITIAL (fndecl
) = error_mark_node
;
6393 DECL_ARGUMENTS (fndecl
) = 0;
6396 if (DECL_STATIC_CONSTRUCTOR (fndecl
))
6398 if (targetm
.have_ctors_dtors
)
6399 (* targetm
.asm_out
.constructor
) (XEXP (DECL_RTL (fndecl
), 0),
6400 DEFAULT_INIT_PRIORITY
);
6402 static_ctors
= tree_cons (NULL_TREE
, fndecl
, static_ctors
);
6405 if (DECL_STATIC_DESTRUCTOR (fndecl
))
6407 if (targetm
.have_ctors_dtors
)
6408 (* targetm
.asm_out
.destructor
) (XEXP (DECL_RTL (fndecl
), 0),
6409 DEFAULT_INIT_PRIORITY
);
6411 static_dtors
= tree_cons (NULL_TREE
, fndecl
, static_dtors
);
6415 /* Return to the enclosing function. */
6416 pop_function_context ();
6417 timevar_pop (TV_EXPAND
);
6420 /* Like c_expand_body_1 but only for unnested functions. */
6423 c_expand_body (tree fndecl
)
6425 c_expand_body_1 (fndecl
, 0);
6428 /* Check the declarations given in a for-loop for satisfying the C99
6431 check_for_loop_decls (void)
6437 /* If we get here, declarations have been used in a for loop without
6438 the C99 for loop scope. This doesn't make much sense, so don't
6440 error ("'for' loop initial declaration used outside C99 mode");
6443 /* C99 subclause 6.8.5 paragraph 3:
6445 [#3] The declaration part of a for statement shall only
6446 declare identifiers for objects having storage class auto or
6449 It isn't clear whether, in this sentence, "identifiers" binds to
6450 "shall only declare" or to "objects" - that is, whether all identifiers
6451 declared must be identifiers for objects, or whether the restriction
6452 only applies to those that are. (A question on this in comp.std.c
6453 in November 2000 received no answer.) We implement the strictest
6454 interpretation, to avoid creating an extension which later causes
6457 for (t
= current_scope
->tags
; t
; t
= TREE_CHAIN (t
))
6459 if (TREE_PURPOSE (t
) != 0)
6461 enum tree_code code
= TREE_CODE (TREE_VALUE (t
));
6463 if (code
== RECORD_TYPE
)
6464 error ("'struct %s' declared in 'for' loop initial declaration",
6465 IDENTIFIER_POINTER (TREE_PURPOSE (t
)));
6466 else if (code
== UNION_TYPE
)
6467 error ("'union %s' declared in 'for' loop initial declaration",
6468 IDENTIFIER_POINTER (TREE_PURPOSE (t
)));
6470 error ("'enum %s' declared in 'for' loop initial declaration",
6471 IDENTIFIER_POINTER (TREE_PURPOSE (t
)));
6475 for (t
= getdecls (); t
; t
= TREE_CHAIN (t
))
6477 const location_t
*locus
= &DECL_SOURCE_LOCATION (t
);
6478 if (TREE_CODE (t
) != VAR_DECL
&& DECL_NAME (t
))
6479 error ("%Hdeclaration of non-variable '%D' in 'for' loop "
6480 "initial declaration", locus
, t
);
6481 else if (TREE_STATIC (t
))
6482 error ("%Hdeclaration of static variable '%D' in 'for' loop "
6483 "initial declaration", locus
, t
);
6484 else if (DECL_EXTERNAL (t
))
6485 error ("%Hdeclaration of 'extern' variable '%D' in 'for' loop "
6486 "initial declaration", locus
, t
);
6490 /* Save and restore the variables in this file and elsewhere
6491 that keep track of the progress of compilation of the current function.
6492 Used for nested functions. */
6494 struct language_function
GTY(())
6496 struct c_language_function base
;
6499 int returns_abnormally
;
6500 int warn_about_return_type
;
6504 /* Save and reinitialize the variables
6505 used during compilation of a C function. */
6508 c_push_function_context (struct function
*f
)
6510 struct language_function
*p
;
6511 p
= ggc_alloc (sizeof (struct language_function
));
6514 p
->base
.x_stmt_tree
= c_stmt_tree
;
6515 p
->base
.x_scope_stmt_stack
= c_scope_stmt_stack
;
6516 p
->returns_value
= current_function_returns_value
;
6517 p
->returns_null
= current_function_returns_null
;
6518 p
->returns_abnormally
= current_function_returns_abnormally
;
6519 p
->warn_about_return_type
= warn_about_return_type
;
6520 p
->extern_inline
= current_extern_inline
;
6523 /* Restore the variables used during compilation of a C function. */
6526 c_pop_function_context (struct function
*f
)
6528 struct language_function
*p
= f
->language
;
6530 if (DECL_SAVED_INSNS (current_function_decl
) == 0
6531 && DECL_SAVED_TREE (current_function_decl
) == NULL_TREE
)
6533 /* Stop pointing to the local nodes about to be freed. */
6534 /* But DECL_INITIAL must remain nonzero so we know this
6535 was an actual function definition. */
6536 DECL_INITIAL (current_function_decl
) = error_mark_node
;
6537 DECL_ARGUMENTS (current_function_decl
) = 0;
6540 c_stmt_tree
= p
->base
.x_stmt_tree
;
6541 c_scope_stmt_stack
= p
->base
.x_scope_stmt_stack
;
6542 current_function_returns_value
= p
->returns_value
;
6543 current_function_returns_null
= p
->returns_null
;
6544 current_function_returns_abnormally
= p
->returns_abnormally
;
6545 warn_about_return_type
= p
->warn_about_return_type
;
6546 current_extern_inline
= p
->extern_inline
;
6551 /* Copy the DECL_LANG_SPECIFIC data associated with DECL. */
6554 c_dup_lang_specific_decl (tree decl
)
6556 struct lang_decl
*ld
;
6558 if (!DECL_LANG_SPECIFIC (decl
))
6561 ld
= ggc_alloc (sizeof (struct lang_decl
));
6562 memcpy (ld
, DECL_LANG_SPECIFIC (decl
), sizeof (struct lang_decl
));
6563 DECL_LANG_SPECIFIC (decl
) = ld
;
6566 /* The functions below are required for functionality of doing
6567 function at once processing in the C front end. Currently these
6568 functions are not called from anywhere in the C front end, but as
6569 these changes continue, that will change. */
6571 /* Returns nonzero if the current statement is a full expression,
6572 i.e. temporaries created during that statement should be destroyed
6573 at the end of the statement. */
6576 stmts_are_full_exprs_p (void)
6581 /* Returns the stmt_tree (if any) to which statements are currently
6582 being added. If there is no active statement-tree, NULL is
6586 current_stmt_tree (void)
6588 return &c_stmt_tree
;
6591 /* Returns the stack of SCOPE_STMTs for the current function. */
6594 current_scope_stmt_stack (void)
6596 return &c_scope_stmt_stack
;
6599 /* Nonzero if TYPE is an anonymous union or struct type. Always 0 in
6603 anon_aggr_type_p (tree node ATTRIBUTE_UNUSED
)
6608 /* Dummy function in place of callback used by C++. */
6611 extract_interface_info (void)
6615 /* Return a new COMPOUND_STMT, after adding it to the current
6619 c_begin_compound_stmt (void)
6623 /* Create the COMPOUND_STMT. */
6624 stmt
= add_stmt (build_stmt (COMPOUND_STMT
, NULL_TREE
));
6629 /* Expand T (a DECL_STMT) if it declares an entity not handled by the
6633 c_expand_decl_stmt (tree t
)
6635 tree decl
= DECL_STMT_DECL (t
);
6637 /* Expand nested functions. */
6638 if (TREE_CODE (decl
) == FUNCTION_DECL
6639 && DECL_CONTEXT (decl
) == current_function_decl
6640 && DECL_SAVED_TREE (decl
))
6641 c_expand_body_1 (decl
, 1);
6644 /* Return the global value of T as a symbol. */
6647 identifier_global_value (tree t
)
6649 tree decl
= IDENTIFIER_SYMBOL_VALUE (t
);
6650 if (decl
== 0 || C_DECL_FILE_SCOPE (decl
))
6653 /* Shadowed by something else; find the true global value. */
6654 for (decl
= global_scope
->names
; decl
; decl
= TREE_CHAIN (decl
))
6655 if (DECL_NAME (decl
) == t
)
6658 /* Only local values for this decl. */
6662 /* Record a builtin type for C. If NAME is non-NULL, it is the name used;
6663 otherwise the name is found in ridpointers from RID_INDEX. */
6666 record_builtin_type (enum rid rid_index
, const char *name
, tree type
)
6670 id
= ridpointers
[(int) rid_index
];
6672 id
= get_identifier (name
);
6673 pushdecl (build_decl (TYPE_DECL
, id
, type
));
6676 /* Build the void_list_node (void_type_node having been created). */
6678 build_void_list_node (void)
6680 tree t
= build_tree_list (NULL_TREE
, void_type_node
);
6684 /* Return something to represent absolute declarators containing a *.
6685 TARGET is the absolute declarator that the * contains.
6686 TYPE_QUALS_ATTRS is a list of modifiers such as const or volatile
6687 to apply to the pointer type, represented as identifiers, possible mixed
6690 We return an INDIRECT_REF whose "contents" are TARGET (inside a TREE_LIST,
6691 if attributes are present) and whose type is the modifier list. */
6694 make_pointer_declarator (tree type_quals_attrs
, tree target
)
6697 tree itarget
= target
;
6698 split_specs_attrs (type_quals_attrs
, &quals
, &attrs
);
6699 if (attrs
!= NULL_TREE
)
6700 itarget
= tree_cons (attrs
, target
, NULL_TREE
);
6701 return build1 (INDIRECT_REF
, quals
, itarget
);
6704 /* A wrapper around lhd_set_decl_assembler_name that gives static
6705 variables their C names if they are at file scope and only one
6706 translation unit is being compiled, for backwards compatibility
6707 with certain bizzare assembler hacks (like crtstuff.c). */
6710 c_static_assembler_name (tree decl
)
6712 if (num_in_fnames
== 1
6713 && !TREE_PUBLIC (decl
) && DECL_CONTEXT (decl
)
6714 && TREE_CODE (DECL_CONTEXT (decl
)) == TRANSLATION_UNIT_DECL
)
6715 SET_DECL_ASSEMBLER_NAME (decl
, DECL_NAME (decl
));
6717 lhd_set_decl_assembler_name (decl
);
6720 /* Hash and equality functions for link_hash_table: key off
6721 DECL_ASSEMBLER_NAME. */
6724 link_hash_hash (const void *x_p
)
6727 return (hashval_t
) (long)DECL_ASSEMBLER_NAME (x
);
6731 link_hash_eq (const void *x1_p
, const void *x2_p
)
6733 tree x1
= (tree
)x1_p
;
6734 tree x2
= (tree
)x2_p
;
6735 return DECL_ASSEMBLER_NAME (x1
) == DECL_ASSEMBLER_NAME (x2
);
6738 /* Propagate information between definitions and uses between multiple
6739 translation units in TU_LIST based on linkage rules. */
6742 merge_translation_unit_decls (void)
6744 const tree tu_list
= current_file_decl
;
6747 htab_t link_hash_table
;
6750 /* Create the BLOCK that poplevel would have created, but don't
6751 actually call poplevel since that's expensive. */
6752 block
= make_node (BLOCK
);
6753 BLOCK_VARS (block
) = current_scope
->names
;
6754 TREE_USED (block
) = 1;
6755 DECL_INITIAL (current_file_decl
) = block
;
6757 /* If only one translation unit seen, no copying necessary. */
6758 if (TREE_CHAIN (tu_list
) == NULL_TREE
)
6761 link_hash_table
= htab_create (1021, link_hash_hash
, link_hash_eq
, NULL
);
6763 /* Enter any actual definitions into the hash table. */
6764 for (tu
= tu_list
; tu
; tu
= TREE_CHAIN (tu
))
6765 for (decl
= BLOCK_VARS (DECL_INITIAL (tu
)); decl
; decl
= TREE_CHAIN (decl
))
6766 if (TREE_PUBLIC (decl
) && ! DECL_EXTERNAL (decl
))
6769 slot
= htab_find_slot (link_hash_table
, decl
, INSERT
);
6771 /* If we've already got a definition, work out which one is
6772 the real one, put it into the hash table, and make the
6773 other one DECL_EXTERNAL. This is important to avoid
6774 putting out two definitions of the same symbol in the
6778 tree old_decl
= (tree
) *slot
;
6780 /* If this is weak or common or whatever, suppress it
6781 in favour of the other definition. */
6782 if (DECL_WEAK (decl
))
6783 DECL_EXTERNAL (decl
) = 1;
6784 else if (DECL_WEAK (old_decl
) && ! DECL_WEAK (decl
))
6785 DECL_EXTERNAL (old_decl
) = 1;
6786 else if (DECL_COMMON (decl
) || DECL_ONE_ONLY (decl
))
6787 DECL_EXTERNAL (decl
) = 1;
6788 else if (DECL_COMMON (old_decl
) || DECL_ONE_ONLY (old_decl
))
6789 DECL_EXTERNAL (old_decl
) = 1;
6791 if (DECL_EXTERNAL (decl
))
6793 DECL_INITIAL (decl
) = NULL_TREE
;
6794 DECL_COMMON (decl
) = 0;
6795 DECL_ONE_ONLY (decl
) = 0;
6796 DECL_WEAK (decl
) = 0;
6798 else if (DECL_EXTERNAL (old_decl
))
6800 DECL_INITIAL (old_decl
) = NULL_TREE
;
6801 DECL_COMMON (old_decl
) = 0;
6802 DECL_ONE_ONLY (old_decl
) = 0;
6803 DECL_WEAK (old_decl
) = 0;
6808 error ("%Hredefinition of global '%D'",
6809 &DECL_SOURCE_LOCATION (decl
), decl
);
6810 error ("%H'%D' previously defined here",
6811 &DECL_SOURCE_LOCATION (old_decl
), old_decl
);
6818 /* Now insert the desired information from all the definitions
6819 into any plain declarations. */
6820 for (tu
= tu_list
; tu
; tu
= TREE_CHAIN (tu
))
6821 for (decl
= BLOCK_VARS (DECL_INITIAL (tu
)); decl
; decl
= TREE_CHAIN (decl
))
6822 if (TREE_PUBLIC (decl
) && DECL_EXTERNAL (decl
))
6825 global_decl
= htab_find (link_hash_table
, decl
);
6830 /* Print any appropriate error messages, and partially merge
6832 (void) duplicate_decls (decl
, global_decl
, true, true);
6835 htab_delete (link_hash_table
);
6838 /* Perform final processing on file-scope data. */
6841 c_write_global_declarations(void)
6845 for (link
= current_file_decl
; link
; link
= TREE_CHAIN (link
))
6847 tree globals
= BLOCK_VARS (DECL_INITIAL (link
));
6848 int len
= list_length (globals
);
6849 tree
*vec
= xmalloc (sizeof (tree
) * len
);
6853 /* Process the decls in the order they were written. */
6855 for (i
= 0, decl
= globals
; i
< len
; i
++, decl
= TREE_CHAIN (decl
))
6858 wrapup_global_declarations (vec
, len
);
6860 check_global_declarations (vec
, len
);
6867 /* Reset the parser's state in preparation for a new file. */
6870 c_reset_state (void)
6873 tree file_scope_decl
;
6875 /* Pop the global scope. */
6876 if (current_scope
!= global_scope
)
6877 current_scope
= global_scope
;
6878 file_scope_decl
= current_file_decl
;
6879 DECL_INITIAL (file_scope_decl
) = poplevel (1, 0, 0);
6880 truly_local_externals
= NULL_TREE
;
6882 /* Start a new global binding level. */
6884 global_scope
= current_scope
;
6885 current_file_decl
= build_decl (TRANSLATION_UNIT_DECL
, NULL
, NULL
);
6886 TREE_CHAIN (current_file_decl
) = file_scope_decl
;
6888 /* Reintroduce the global declarations. */
6889 for (link
= builtin_decls
; link
; link
= TREE_CHAIN (link
))
6890 pushdecl (copy_node (link
));
6893 #include "gt-c-decl.h"