1 /* Process declarations and variables for C compiler.
2 Copyright (C) 1988, 92-98, 1999 Free Software Foundation, Inc.
4 This file is part of GNU CC.
6 GNU CC is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
11 GNU CC is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with GNU CC; see the file COPYING. If not, write to
18 the Free Software Foundation, 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
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. */
43 extern cpp_reader parse_in
;
46 /* In grokdeclarator, distinguish syntactic contexts of declarators. */
48 { NORMAL
, /* Ordinary declaration */
49 FUNCDEF
, /* Function definition */
50 PARM
, /* Declaration of parm before function body */
51 FIELD
, /* Declaration inside struct or union */
52 BITFIELD
, /* Likewise but with specified width */
53 TYPENAME
}; /* Typename (inside cast or sizeof) */
55 #ifndef CHAR_TYPE_SIZE
56 #define CHAR_TYPE_SIZE BITS_PER_UNIT
59 #ifndef SHORT_TYPE_SIZE
60 #define SHORT_TYPE_SIZE (BITS_PER_UNIT * MIN ((UNITS_PER_WORD + 1) / 2, 2))
64 #define INT_TYPE_SIZE BITS_PER_WORD
67 #ifndef LONG_TYPE_SIZE
68 #define LONG_TYPE_SIZE BITS_PER_WORD
71 #ifndef LONG_LONG_TYPE_SIZE
72 #define LONG_LONG_TYPE_SIZE (BITS_PER_WORD * 2)
75 #ifndef WCHAR_UNSIGNED
76 #define WCHAR_UNSIGNED 0
79 #ifndef FLOAT_TYPE_SIZE
80 #define FLOAT_TYPE_SIZE BITS_PER_WORD
83 #ifndef DOUBLE_TYPE_SIZE
84 #define DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
87 #ifndef LONG_DOUBLE_TYPE_SIZE
88 #define LONG_DOUBLE_TYPE_SIZE (BITS_PER_WORD * 2)
91 /* We let tm.h override the types used here, to handle trivial differences
92 such as the choice of unsigned int or long unsigned int for size_t.
93 When machines start needing nontrivial differences in the size type,
94 it would be best to do something here to figure out automatically
95 from other information what type to use. */
98 #define SIZE_TYPE "long unsigned int"
102 #define PTRDIFF_TYPE "long int"
106 #define WCHAR_TYPE "int"
112 /* a node which has tree code ERROR_MARK, and whose type is itself.
113 All erroneous expressions are replaced with this node. All functions
114 that accept nodes as arguments should avoid generating error messages
115 if this node is one of the arguments, since it is undesirable to get
116 multiple error messages from one error in the input. */
118 tree error_mark_node
;
120 /* These can't be part of the above array, since they are declared
121 individually in tree.h, and used by the debug output routines. */
125 tree integer_type_node
;
126 tree unsigned_type_node
;
128 /* These can't be part of the above array, since they are declared
129 individially in tree.h and used by the target routines. */
132 tree va_list_type_node
;
134 /* Two expressions that are constants with value zero.
135 The first is of type `int', the second of type `void *'. */
137 tree integer_zero_node
;
138 tree null_pointer_node
;
140 /* A node for the integer constant 1. */
142 tree integer_one_node
;
144 /* Nonzero if we have seen an invalid cross reference
145 to a struct, union, or enum, but not yet printed the message. */
147 tree pending_invalid_xref
;
148 /* File and line to appear in the eventual error message. */
149 char *pending_invalid_xref_file
;
150 int pending_invalid_xref_line
;
152 /* While defining an enum type, this is 1 plus the last enumerator
153 constant value. Note that will do not have to save this or `enum_overflow'
154 around nested function definition since such a definition could only
155 occur in an enum value expression and we don't use these variables in
158 static tree enum_next_value
;
160 /* Nonzero means that there was overflow computing enum_next_value. */
162 static int enum_overflow
;
164 /* Parsing a function declarator leaves a list of parameter names
165 or a chain or parameter decls here. */
167 static tree last_function_parms
;
169 /* Parsing a function declarator leaves here a chain of structure
170 and enum types declared in the parmlist. */
172 static tree last_function_parm_tags
;
174 /* After parsing the declarator that starts a function definition,
175 `start_function' puts here the list of parameter names or chain of decls.
176 `store_parm_decls' finds it here. */
178 static tree current_function_parms
;
180 /* Similar, for last_function_parm_tags. */
181 static tree current_function_parm_tags
;
183 /* Similar, for the file and line that the prototype came from if this is
184 an old-style definition. */
185 static char *current_function_prototype_file
;
186 static int current_function_prototype_line
;
188 /* A list (chain of TREE_LIST nodes) of all LABEL_DECLs in the function
189 that have names. Here so we can clear out their names' definitions
190 at the end of the function. */
192 static tree named_labels
;
194 /* A list of LABEL_DECLs from outer contexts that are currently shadowed. */
196 static tree shadowed_labels
;
198 /* Nonzero when store_parm_decls is called indicates a varargs function.
199 Value not meaningful after store_parm_decls. */
201 static int c_function_varargs
;
203 /* The FUNCTION_DECL for the function currently being compiled,
204 or 0 if between functions. */
205 tree current_function_decl
;
207 /* Set to 0 at beginning of a function definition, set to 1 if
208 a return statement that specifies a return value is seen. */
210 int current_function_returns_value
;
212 /* Set to 0 at beginning of a function definition, set to 1 if
213 a return statement with no argument is seen. */
215 int current_function_returns_null
;
217 /* Set to nonzero by `grokdeclarator' for a function
218 whose return type is defaulted, if warnings for this are desired. */
220 static int warn_about_return_type
;
222 /* Nonzero when starting a function declared `extern inline'. */
224 static int current_extern_inline
;
226 /* For each binding contour we allocate a binding_level structure
227 * which records the names defined in that contour.
230 * 1) one for each function definition,
231 * where internal declarations of the parameters appear.
232 * 2) one for each compound statement,
233 * to record its declarations.
235 * The current meaning of a name can be found by searching the levels from
236 * the current one out to the global one.
239 /* Note that the information in the `names' component of the global contour
240 is duplicated in the IDENTIFIER_GLOBAL_VALUEs of all identifiers. */
244 /* A chain of _DECL nodes for all variables, constants, functions,
245 and typedef types. These are in the reverse of the order supplied.
249 /* A list of structure, union and enum definitions,
250 * for looking up tag names.
251 * It is a chain of TREE_LIST nodes, each of whose TREE_PURPOSE is a name,
252 * or NULL_TREE; and whose TREE_VALUE is a RECORD_TYPE, UNION_TYPE,
253 * or ENUMERAL_TYPE node.
257 /* For each level, a list of shadowed outer-level local definitions
258 to be restored when this level is popped.
259 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
260 whose TREE_VALUE is its old definition (a kind of ..._DECL node). */
263 /* For each level (except not the global one),
264 a chain of BLOCK nodes for all the levels
265 that were entered and exited one level down. */
268 /* The BLOCK node for this level, if one has been preallocated.
269 If 0, the BLOCK is allocated (if needed) when the level is popped. */
272 /* The binding level which this one is contained in (inherits from). */
273 struct binding_level
*level_chain
;
275 /* Nonzero for the level that holds the parameters of a function. */
278 /* Nonzero if this level "doesn't exist" for tags. */
279 char tag_transparent
;
281 /* Nonzero if sublevels of this level "don't exist" for tags.
282 This is set in the parm level of a function definition
283 while reading the function body, so that the outermost block
284 of the function body will be tag-transparent. */
285 char subblocks_tag_transparent
;
287 /* Nonzero means make a BLOCK for this level regardless of all else. */
290 /* Nonzero means make a BLOCK if this level has any subblocks. */
291 char keep_if_subblocks
;
293 /* Number of decls in `names' that have incomplete
294 structure or union types. */
297 /* A list of decls giving the (reversed) specified order of parms,
298 not including any forward-decls in the parmlist.
299 This is so we can put the parms in proper order for assign_parms. */
303 #define NULL_BINDING_LEVEL (struct binding_level *) NULL
305 /* The binding level currently in effect. */
307 static struct binding_level
*current_binding_level
;
309 /* A chain of binding_level structures awaiting reuse. */
311 static struct binding_level
*free_binding_level
;
313 /* The outermost binding level, for names of file scope.
314 This is created when the compiler is started and exists
315 through the entire run. */
317 static struct binding_level
*global_binding_level
;
319 /* Binding level structures are initialized by copying this one. */
321 static struct binding_level clear_binding_level
322 = {NULL
, NULL
, NULL
, NULL
, NULL
, NULL_BINDING_LEVEL
, 0, 0, 0, 0, 0, 0,
325 /* Nonzero means unconditionally make a BLOCK for the next level pushed. */
327 static int keep_next_level_flag
;
329 /* Nonzero means make a BLOCK for the next level pushed
330 if it has subblocks. */
332 static int keep_next_if_subblocks
;
334 /* The chain of outer levels of label scopes.
335 This uses the same data structure used for binding levels,
336 but it works differently: each link in the chain records
337 saved values of named_labels and shadowed_labels for
338 a label binding level outside the current one. */
340 static struct binding_level
*label_level_chain
;
342 /* Functions called automatically at the beginning and end of execution. */
344 tree static_ctors
, static_dtors
;
346 /* Forward declarations. */
348 static struct binding_level
* make_binding_level
PROTO((void));
349 static void mark_binding_level
PROTO((void *));
350 static void clear_limbo_values
PROTO((tree
));
351 static int duplicate_decls
PROTO((tree
, tree
, int));
352 static int redeclaration_error_message
PROTO((tree
, tree
));
353 static void storedecls
PROTO((tree
));
354 static void storetags
PROTO((tree
));
355 static tree lookup_tag
PROTO((enum tree_code
, tree
,
356 struct binding_level
*, int));
357 static tree lookup_tag_reverse
PROTO((tree
));
358 static tree grokdeclarator
PROTO((tree
, tree
, enum decl_context
,
360 static tree grokparms
PROTO((tree
, int));
361 static int field_decl_cmp
PROTO((const GENERIC_PTR
, const GENERIC_PTR
));
362 static void layout_array_type
PROTO((tree
));
364 /* C-specific option variables. */
366 /* Nonzero means allow type mismatches in conditional expressions;
367 just make their values `void'. */
369 int flag_cond_mismatch
;
371 /* Nonzero means give `double' the same size as `float'. */
373 int flag_short_double
;
375 /* Nonzero means don't recognize the keyword `asm'. */
379 /* Nonzero means don't recognize any builtin functions. */
383 /* Nonzero means don't recognize the non-ANSI builtin functions.
386 int flag_no_nonansi_builtin
;
388 /* Nonzero means do some things the same way PCC does. */
390 int flag_traditional
;
392 /* Nonzero means use the ISO C9x dialect of C. */
396 /* Nonzero means that we have builtin functions, and main is an int */
400 /* Nonzero means to allow single precision math even if we're generally
401 being traditional. */
402 int flag_allow_single_precision
= 0;
404 /* Nonzero means to treat bitfields as signed unless they say `unsigned'. */
406 int flag_signed_bitfields
= 1;
407 int explicit_flag_signed_bitfields
= 0;
409 /* Nonzero means warn about use of implicit int. */
411 int warn_implicit_int
;
413 /* Nonzero means warn about usage of long long when `-pedantic'. */
415 int warn_long_long
= 1;
417 /* Nonzero means message about use of implicit function declarations;
418 1 means warning; 2 means error. */
420 int mesg_implicit_function_declaration
;
422 /* Nonzero means give string constants the type `const char *'
423 to get extra warnings from them. These warnings will be too numerous
424 to be useful, except in thoroughly ANSIfied programs. */
426 int flag_const_strings
;
428 /* Nonzero means warn about pointer casts that can drop a type qualifier
429 from the pointer target type. */
433 /* Nonzero means warn when casting a function call to a type that does
434 not match the return type (e.g. (float)sqrt() or (anything*)malloc()
435 when there is no previous declaration of sqrt or malloc. */
437 int warn_bad_function_cast
;
439 /* Warn about functions which might be candidates for attribute noreturn. */
441 int warn_missing_noreturn
;
443 /* Warn about traditional constructs whose meanings changed in ANSI C. */
445 int warn_traditional
;
447 /* Nonzero means warn about sizeof(function) or addition/subtraction
448 of function pointers. */
450 int warn_pointer_arith
;
452 /* Nonzero means warn for non-prototype function decls
453 or non-prototyped defs without previous prototype. */
455 int warn_strict_prototypes
;
457 /* Nonzero means warn for any global function def
458 without separate previous prototype decl. */
460 int warn_missing_prototypes
;
462 /* Nonzero means warn for any global function def
463 without separate previous decl. */
465 int warn_missing_declarations
;
467 /* Nonzero means warn about multiple (redundant) decls for the same single
468 variable or function. */
470 int warn_redundant_decls
= 0;
472 /* Nonzero means warn about extern declarations of objects not at
473 file-scope level and about *all* declarations of functions (whether
474 extern or static) not at file-scope level. Note that we exclude
475 implicit function declarations. To get warnings about those, use
478 int warn_nested_externs
= 0;
480 /* Warn about *printf or *scanf format/argument anomalies. */
484 /* Warn about a subscript that has type char. */
486 int warn_char_subscripts
= 0;
488 /* Warn if a type conversion is done that might have confusing results. */
492 /* Warn if adding () is suggested. */
494 int warn_parentheses
;
496 /* Warn if initializer is not completely bracketed. */
498 int warn_missing_braces
;
500 /* Warn if main is suspicious. */
504 /* Warn about #pragma directives that are not recognised. */
506 int warn_unknown_pragmas
= 0; /* Tri state variable. */
508 /* Warn about comparison of signed and unsigned values.
509 If -1, neither -Wsign-compare nor -Wno-sign-compare has been specified. */
511 int warn_sign_compare
= -1;
513 /* Nonzero means warn about use of multicharacter literals. */
515 int warn_multichar
= 1;
517 /* Nonzero means `$' can be in an identifier. */
519 #ifndef DOLLARS_IN_IDENTIFIERS
520 #define DOLLARS_IN_IDENTIFIERS 1
522 int dollars_in_ident
= DOLLARS_IN_IDENTIFIERS
;
524 /* Decode the string P as a language-specific option for C.
525 Return the number of strings consumed. */
528 c_decode_option (argc
, argv
)
529 int argc ATTRIBUTE_UNUSED
;
532 int strings_processed
;
535 strings_processed
= cpp_handle_option (&parse_in
, argc
, argv
);
537 strings_processed
= 0;
538 #endif /* ! USE_CPPLIB */
540 if (!strcmp (p
, "-ftraditional") || !strcmp (p
, "-traditional"))
542 flag_traditional
= 1;
543 flag_writable_strings
= 1;
545 else if (!strcmp (p
, "-fallow-single-precision"))
546 flag_allow_single_precision
= 1;
547 else if (!strcmp (p
, "-fhosted") || !strcmp (p
, "-fno-freestanding"))
552 else if (!strcmp (p
, "-ffreestanding") || !strcmp (p
, "-fno-hosted"))
556 /* warn_main will be 2 if set by -Wall, 1 if set by -Wmain */
560 else if (!strcmp (p
, "-fnotraditional") || !strcmp (p
, "-fno-traditional"))
562 flag_traditional
= 0;
563 flag_writable_strings
= 0;
565 else if (!strncmp (p
, "-std=", 5))
567 /* Select the appropriate language standard. We currently
569 -std=iso9899:1990 same as -ansi
570 -std=iso9899:199409 ISO C as modified in amend. 1
571 -std=iso9899:199x ISO C 9x
572 -std=c89 same as -std=iso9899:1990
573 -std=c9x same as -std=iso9899:199x
574 -std=gnu89 default, iso9899:1990 + gnu extensions
575 -std=gnu9x iso9899:199x + gnu extensions
577 const char *argstart
= &p
[5];
579 if (!strcmp (argstart
, "iso9899:1990")
580 || !strcmp (argstart
, "c89"))
583 flag_traditional
= 0;
584 flag_writable_strings
= 0;
586 flag_no_nonansi_builtin
= 1;
589 else if (!strcmp (argstart
, "iso9899:199409"))
591 /* ??? The changes since ISO C 1990 are not supported. */
594 else if (!strcmp (argstart
, "iso9899:199x")
595 || !strcmp (argstart
, "c9x"))
597 flag_traditional
= 0;
598 flag_writable_strings
= 0;
600 flag_no_nonansi_builtin
= 1;
603 else if (!strcmp (argstart
, "gnu89"))
605 flag_traditional
= 0;
606 flag_writable_strings
= 0;
608 flag_no_nonansi_builtin
= 0;
611 else if (!strcmp (argstart
, "gnu9x"))
613 flag_traditional
= 0;
614 flag_writable_strings
= 0;
616 flag_no_nonansi_builtin
= 0;
620 error ("unknown C standard `%s'", argstart
);
622 else if (!strcmp (p
, "-fdollars-in-identifiers"))
623 dollars_in_ident
= 1;
624 else if (!strcmp (p
, "-fno-dollars-in-identifiers"))
625 dollars_in_ident
= 0;
626 else if (!strcmp (p
, "-fsigned-char"))
627 flag_signed_char
= 1;
628 else if (!strcmp (p
, "-funsigned-char"))
629 flag_signed_char
= 0;
630 else if (!strcmp (p
, "-fno-signed-char"))
631 flag_signed_char
= 0;
632 else if (!strcmp (p
, "-fno-unsigned-char"))
633 flag_signed_char
= 1;
634 else if (!strcmp (p
, "-fsigned-bitfields")
635 || !strcmp (p
, "-fno-unsigned-bitfields"))
637 flag_signed_bitfields
= 1;
638 explicit_flag_signed_bitfields
= 1;
640 else if (!strcmp (p
, "-funsigned-bitfields")
641 || !strcmp (p
, "-fno-signed-bitfields"))
643 flag_signed_bitfields
= 0;
644 explicit_flag_signed_bitfields
= 1;
646 else if (!strcmp (p
, "-fshort-enums"))
647 flag_short_enums
= 1;
648 else if (!strcmp (p
, "-fno-short-enums"))
649 flag_short_enums
= 0;
650 else if (!strcmp (p
, "-fcond-mismatch"))
651 flag_cond_mismatch
= 1;
652 else if (!strcmp (p
, "-fno-cond-mismatch"))
653 flag_cond_mismatch
= 0;
654 else if (!strcmp (p
, "-fshort-double"))
655 flag_short_double
= 1;
656 else if (!strcmp (p
, "-fno-short-double"))
657 flag_short_double
= 0;
658 else if (!strcmp (p
, "-fasm"))
660 else if (!strcmp (p
, "-fno-asm"))
662 else if (!strcmp (p
, "-fbuiltin"))
664 else if (!strcmp (p
, "-fno-builtin"))
666 else if (!strcmp (p
, "-ansi"))
668 else if (!strcmp (p
, "-Werror-implicit-function-declaration"))
669 mesg_implicit_function_declaration
= 2;
670 else if (!strcmp (p
, "-Wimplicit-function-declaration"))
671 mesg_implicit_function_declaration
= 1;
672 else if (!strcmp (p
, "-Wno-implicit-function-declaration"))
673 mesg_implicit_function_declaration
= 0;
674 else if (!strcmp (p
, "-Wimplicit-int"))
675 warn_implicit_int
= 1;
676 else if (!strcmp (p
, "-Wno-implicit-int"))
677 warn_implicit_int
= 0;
678 else if (!strcmp (p
, "-Wimplicit"))
680 warn_implicit_int
= 1;
681 if (mesg_implicit_function_declaration
!= 2)
682 mesg_implicit_function_declaration
= 1;
684 else if (!strcmp (p
, "-Wno-implicit"))
685 warn_implicit_int
= 0, mesg_implicit_function_declaration
= 0;
686 else if (!strcmp (p
, "-Wlong-long"))
688 else if (!strcmp (p
, "-Wno-long-long"))
690 else if (!strcmp (p
, "-Wwrite-strings"))
691 flag_const_strings
= 1;
692 else if (!strcmp (p
, "-Wno-write-strings"))
693 flag_const_strings
= 0;
694 else if (!strcmp (p
, "-Wcast-qual"))
696 else if (!strcmp (p
, "-Wno-cast-qual"))
698 else if (!strcmp (p
, "-Wbad-function-cast"))
699 warn_bad_function_cast
= 1;
700 else if (!strcmp (p
, "-Wno-bad-function-cast"))
701 warn_bad_function_cast
= 0;
702 else if (!strcmp (p
, "-Wmissing-noreturn"))
703 warn_missing_noreturn
= 1;
704 else if (!strcmp (p
, "-Wno-missing-noreturn"))
705 warn_missing_noreturn
= 0;
706 else if (!strcmp (p
, "-Wpointer-arith"))
707 warn_pointer_arith
= 1;
708 else if (!strcmp (p
, "-Wno-pointer-arith"))
709 warn_pointer_arith
= 0;
710 else if (!strcmp (p
, "-Wstrict-prototypes"))
711 warn_strict_prototypes
= 1;
712 else if (!strcmp (p
, "-Wno-strict-prototypes"))
713 warn_strict_prototypes
= 0;
714 else if (!strcmp (p
, "-Wmissing-prototypes"))
715 warn_missing_prototypes
= 1;
716 else if (!strcmp (p
, "-Wno-missing-prototypes"))
717 warn_missing_prototypes
= 0;
718 else if (!strcmp (p
, "-Wmissing-declarations"))
719 warn_missing_declarations
= 1;
720 else if (!strcmp (p
, "-Wno-missing-declarations"))
721 warn_missing_declarations
= 0;
722 else if (!strcmp (p
, "-Wredundant-decls"))
723 warn_redundant_decls
= 1;
724 else if (!strcmp (p
, "-Wno-redundant-decls"))
725 warn_redundant_decls
= 0;
726 else if (!strcmp (p
, "-Wnested-externs"))
727 warn_nested_externs
= 1;
728 else if (!strcmp (p
, "-Wno-nested-externs"))
729 warn_nested_externs
= 0;
730 else if (!strcmp (p
, "-Wtraditional"))
731 warn_traditional
= 1;
732 else if (!strcmp (p
, "-Wno-traditional"))
733 warn_traditional
= 0;
734 else if (!strcmp (p
, "-Wformat"))
736 else if (!strcmp (p
, "-Wno-format"))
738 else if (!strcmp (p
, "-Wchar-subscripts"))
739 warn_char_subscripts
= 1;
740 else if (!strcmp (p
, "-Wno-char-subscripts"))
741 warn_char_subscripts
= 0;
742 else if (!strcmp (p
, "-Wconversion"))
744 else if (!strcmp (p
, "-Wno-conversion"))
746 else if (!strcmp (p
, "-Wparentheses"))
747 warn_parentheses
= 1;
748 else if (!strcmp (p
, "-Wno-parentheses"))
749 warn_parentheses
= 0;
750 else if (!strcmp (p
, "-Wreturn-type"))
751 warn_return_type
= 1;
752 else if (!strcmp (p
, "-Wno-return-type"))
753 warn_return_type
= 0;
754 else if (!strcmp (p
, "-Wcomment"))
755 ; /* cpp handles this one. */
756 else if (!strcmp (p
, "-Wno-comment"))
757 ; /* cpp handles this one. */
758 else if (!strcmp (p
, "-Wcomments"))
759 ; /* cpp handles this one. */
760 else if (!strcmp (p
, "-Wno-comments"))
761 ; /* cpp handles this one. */
762 else if (!strcmp (p
, "-Wtrigraphs"))
763 ; /* cpp handles this one. */
764 else if (!strcmp (p
, "-Wno-trigraphs"))
765 ; /* cpp handles this one. */
766 else if (!strcmp (p
, "-Wundef"))
767 ; /* cpp handles this one. */
768 else if (!strcmp (p
, "-Wno-undef"))
769 ; /* cpp handles this one. */
770 else if (!strcmp (p
, "-Wimport"))
771 ; /* cpp handles this one. */
772 else if (!strcmp (p
, "-Wno-import"))
773 ; /* cpp handles this one. */
774 else if (!strcmp (p
, "-Wmissing-braces"))
775 warn_missing_braces
= 1;
776 else if (!strcmp (p
, "-Wno-missing-braces"))
777 warn_missing_braces
= 0;
778 else if (!strcmp (p
, "-Wmain"))
780 else if (!strcmp (p
, "-Wno-main"))
782 else if (!strcmp (p
, "-Wsign-compare"))
783 warn_sign_compare
= 1;
784 else if (!strcmp (p
, "-Wno-sign-compare"))
785 warn_sign_compare
= 0;
786 else if (!strcmp (p
, "-Wmultichar"))
788 else if (!strcmp (p
, "-Wno-multichar"))
790 else if (!strcmp (p
, "-Wunknown-pragmas"))
791 /* Set to greater than 1, so that even unknown pragmas in system
792 headers will be warned about. */
793 warn_unknown_pragmas
= 2;
794 else if (!strcmp (p
, "-Wno-unknown-pragmas"))
795 warn_unknown_pragmas
= 0;
796 else if (!strcmp (p
, "-Wall"))
798 /* We save the value of warn_uninitialized, since if they put
799 -Wuninitialized on the command line, we need to generate a
800 warning about not using it without also specifying -O. */
801 if (warn_uninitialized
!= 1)
802 warn_uninitialized
= 2;
803 warn_implicit_int
= 1;
804 mesg_implicit_function_declaration
= 1;
805 warn_return_type
= 1;
809 warn_char_subscripts
= 1;
810 warn_parentheses
= 1;
811 warn_missing_braces
= 1;
812 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding can turn
813 it off only if it's not explicit. */
815 /* Only warn about unknown pragmas that are not in system headers. */
816 warn_unknown_pragmas
= 1;
819 return strings_processed
;
824 /* Hooks for print_node. */
827 print_lang_decl (file
, node
, indent
)
828 FILE *file ATTRIBUTE_UNUSED
;
829 tree node ATTRIBUTE_UNUSED
;
830 int indent ATTRIBUTE_UNUSED
;
835 print_lang_type (file
, node
, indent
)
836 FILE *file ATTRIBUTE_UNUSED
;
837 tree node ATTRIBUTE_UNUSED
;
838 int indent ATTRIBUTE_UNUSED
;
843 print_lang_identifier (file
, node
, indent
)
848 print_node (file
, "global", IDENTIFIER_GLOBAL_VALUE (node
), indent
+ 4);
849 print_node (file
, "local", IDENTIFIER_LOCAL_VALUE (node
), indent
+ 4);
850 print_node (file
, "label", IDENTIFIER_LABEL_VALUE (node
), indent
+ 4);
851 print_node (file
, "implicit", IDENTIFIER_IMPLICIT_DECL (node
), indent
+ 4);
852 print_node (file
, "error locus", IDENTIFIER_ERROR_LOCUS (node
), indent
+ 4);
853 print_node (file
, "limbo value", IDENTIFIER_LIMBO_VALUE (node
), indent
+ 4);
856 /* Hook called at end of compilation to assume 1 elt
857 for a top-level array decl that wasn't complete before. */
860 finish_incomplete_decl (decl
)
863 if (TREE_CODE (decl
) == VAR_DECL
)
865 tree type
= TREE_TYPE (decl
);
866 if (type
!= error_mark_node
867 && TREE_CODE (type
) == ARRAY_TYPE
868 && TYPE_DOMAIN (type
) == 0)
870 if (! DECL_EXTERNAL (decl
))
871 warning_with_decl (decl
, "array `%s' assumed to have one element");
873 complete_array_type (type
, NULL_TREE
, 1);
875 layout_decl (decl
, 0);
880 /* Create a new `struct binding_level'. */
883 struct binding_level
*
884 make_binding_level ()
887 return (struct binding_level
*) xmalloc (sizeof (struct binding_level
));
890 /* Nonzero if we are currently in the global binding level. */
895 return current_binding_level
== global_binding_level
;
901 keep_next_level_flag
= 1;
904 /* Nonzero if the current level needs to have a BLOCK made. */
909 return ((current_binding_level
->keep_if_subblocks
910 && current_binding_level
->blocks
!= 0)
911 || current_binding_level
->keep
912 || current_binding_level
->names
!= 0
913 || (current_binding_level
->tags
!= 0
914 && !current_binding_level
->tag_transparent
));
917 /* Identify this binding level as a level of parameters.
918 DEFINITION_FLAG is 1 for a definition, 0 for a declaration.
919 But it turns out there is no way to pass the right value for
920 DEFINITION_FLAG, so we ignore it. */
923 declare_parm_level (definition_flag
)
924 int definition_flag ATTRIBUTE_UNUSED
;
926 current_binding_level
->parm_flag
= 1;
929 /* Nonzero if currently making parm declarations. */
934 return current_binding_level
->parm_flag
;
937 /* Enter a new binding level.
938 If TAG_TRANSPARENT is nonzero, do so only for the name space of variables,
939 not for that of tags. */
942 pushlevel (tag_transparent
)
945 register struct binding_level
*newlevel
= NULL_BINDING_LEVEL
;
947 /* If this is the top level of a function,
948 just make sure that NAMED_LABELS is 0. */
950 if (current_binding_level
== global_binding_level
)
955 /* Reuse or create a struct for this binding level. */
957 if (free_binding_level
)
959 newlevel
= free_binding_level
;
960 free_binding_level
= free_binding_level
->level_chain
;
964 newlevel
= make_binding_level ();
967 /* Add this level to the front of the chain (stack) of levels that
970 *newlevel
= clear_binding_level
;
971 newlevel
->tag_transparent
973 || (current_binding_level
974 ? current_binding_level
->subblocks_tag_transparent
976 newlevel
->level_chain
= current_binding_level
;
977 current_binding_level
= newlevel
;
978 newlevel
->keep
= keep_next_level_flag
;
979 keep_next_level_flag
= 0;
980 newlevel
->keep_if_subblocks
= keep_next_if_subblocks
;
981 keep_next_if_subblocks
= 0;
984 /* Clear the limbo values of all identifiers defined in BLOCK or a subblock. */
987 clear_limbo_values (block
)
992 for (tem
= BLOCK_VARS (block
); tem
; tem
= TREE_CHAIN (tem
))
993 if (DECL_NAME (tem
) != 0)
994 IDENTIFIER_LIMBO_VALUE (DECL_NAME (tem
)) = 0;
996 for (tem
= BLOCK_SUBBLOCKS (block
); tem
; tem
= TREE_CHAIN (tem
))
997 clear_limbo_values (tem
);
1000 /* Exit a binding level.
1001 Pop the level off, and restore the state of the identifier-decl mappings
1002 that were in effect when this level was entered.
1004 If KEEP is nonzero, this level had explicit declarations, so
1005 and create a "block" (a BLOCK node) for the level
1006 to record its declarations and subblocks for symbol table output.
1008 If FUNCTIONBODY is nonzero, this level is the body of a function,
1009 so create a block as if KEEP were set and also clear out all
1012 If REVERSE is nonzero, reverse the order of decls before putting
1013 them into the BLOCK. */
1016 poplevel (keep
, reverse
, functionbody
)
1022 /* The chain of decls was accumulated in reverse order.
1023 Put it into forward order, just for cleanliness. */
1025 tree tags
= current_binding_level
->tags
;
1026 tree subblocks
= current_binding_level
->blocks
;
1029 int block_previously_created
;
1031 keep
|= current_binding_level
->keep
;
1033 /* This warning is turned off because it causes warnings for
1034 declarations like `extern struct foo *x'. */
1036 /* Warn about incomplete structure types in this level. */
1037 for (link
= tags
; link
; link
= TREE_CHAIN (link
))
1038 if (TYPE_SIZE (TREE_VALUE (link
)) == 0)
1040 tree type
= TREE_VALUE (link
);
1041 tree type_name
= TYPE_NAME (type
);
1042 char *id
= IDENTIFIER_POINTER (TREE_CODE (type_name
) == IDENTIFIER_NODE
1044 : DECL_NAME (type_name
));
1045 switch (TREE_CODE (type
))
1048 error ("`struct %s' incomplete in scope ending here", id
);
1051 error ("`union %s' incomplete in scope ending here", id
);
1054 error ("`enum %s' incomplete in scope ending here", id
);
1060 /* Get the decls in the order they were written.
1061 Usually current_binding_level->names is in reverse order.
1062 But parameter decls were previously put in forward order. */
1065 current_binding_level
->names
1066 = decls
= nreverse (current_binding_level
->names
);
1068 decls
= current_binding_level
->names
;
1070 /* Output any nested inline functions within this block
1071 if they weren't already output. */
1073 for (decl
= decls
; decl
; decl
= TREE_CHAIN (decl
))
1074 if (TREE_CODE (decl
) == FUNCTION_DECL
1075 && ! TREE_ASM_WRITTEN (decl
)
1076 && DECL_INITIAL (decl
) != 0
1077 && TREE_ADDRESSABLE (decl
))
1079 /* If this decl was copied from a file-scope decl
1080 on account of a block-scope extern decl,
1081 propagate TREE_ADDRESSABLE to the file-scope decl.
1083 DECL_ABSTRACT_ORIGIN can be set to itself if warn_return_type is
1084 true, since then the decl goes through save_for_inline_copying. */
1085 if (DECL_ABSTRACT_ORIGIN (decl
) != 0
1086 && DECL_ABSTRACT_ORIGIN (decl
) != decl
)
1087 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (decl
)) = 1;
1088 else if (DECL_SAVED_INSNS (decl
) != 0)
1090 push_function_context ();
1091 output_inline_function (decl
);
1092 pop_function_context ();
1096 /* If there were any declarations or structure tags in that level,
1097 or if this level is a function body,
1098 create a BLOCK to record them for the life of this function. */
1101 block_previously_created
= (current_binding_level
->this_block
!= 0);
1102 if (block_previously_created
)
1103 block
= current_binding_level
->this_block
;
1104 else if (keep
|| functionbody
1105 || (current_binding_level
->keep_if_subblocks
&& subblocks
!= 0))
1106 block
= make_node (BLOCK
);
1109 BLOCK_VARS (block
) = decls
;
1110 BLOCK_TYPE_TAGS (block
) = tags
;
1111 BLOCK_SUBBLOCKS (block
) = subblocks
;
1112 remember_end_note (block
);
1115 /* In each subblock, record that this is its superior. */
1117 for (link
= subblocks
; link
; link
= TREE_CHAIN (link
))
1118 BLOCK_SUPERCONTEXT (link
) = block
;
1120 /* Clear out the meanings of the local variables of this level. */
1122 for (link
= decls
; link
; link
= TREE_CHAIN (link
))
1124 if (DECL_NAME (link
) != 0)
1126 /* If the ident. was used or addressed via a local extern decl,
1127 don't forget that fact. */
1128 if (DECL_EXTERNAL (link
))
1130 if (TREE_USED (link
))
1131 TREE_USED (DECL_NAME (link
)) = 1;
1132 if (TREE_ADDRESSABLE (link
))
1133 TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (link
)) = 1;
1135 IDENTIFIER_LOCAL_VALUE (DECL_NAME (link
)) = 0;
1139 /* Restore all name-meanings of the outer levels
1140 that were shadowed by this level. */
1142 for (link
= current_binding_level
->shadowed
; link
; link
= TREE_CHAIN (link
))
1143 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link
)) = TREE_VALUE (link
);
1145 /* If the level being exited is the top level of a function,
1146 check over all the labels, and clear out the current
1147 (function local) meanings of their names. */
1151 clear_limbo_values (block
);
1153 /* If this is the top level block of a function,
1154 the vars are the function's parameters.
1155 Don't leave them in the BLOCK because they are
1156 found in the FUNCTION_DECL instead. */
1158 BLOCK_VARS (block
) = 0;
1160 /* Clear out the definitions of all label names,
1161 since their scopes end here,
1162 and add them to BLOCK_VARS. */
1164 for (link
= named_labels
; link
; link
= TREE_CHAIN (link
))
1166 register tree label
= TREE_VALUE (link
);
1168 if (DECL_INITIAL (label
) == 0)
1170 error_with_decl (label
, "label `%s' used but not defined");
1171 /* Avoid crashing later. */
1172 define_label (input_filename
, lineno
,
1175 else if (warn_unused
&& !TREE_USED (label
))
1176 warning_with_decl (label
, "label `%s' defined but not used");
1177 IDENTIFIER_LABEL_VALUE (DECL_NAME (label
)) = 0;
1179 /* Put the labels into the "variables" of the
1180 top-level block, so debugger can see them. */
1181 TREE_CHAIN (label
) = BLOCK_VARS (block
);
1182 BLOCK_VARS (block
) = label
;
1186 /* Pop the current level, and free the structure for reuse. */
1189 register struct binding_level
*level
= current_binding_level
;
1190 current_binding_level
= current_binding_level
->level_chain
;
1192 level
->level_chain
= free_binding_level
;
1193 free_binding_level
= level
;
1196 /* Dispose of the block that we just made inside some higher level. */
1198 DECL_INITIAL (current_function_decl
) = block
;
1201 if (!block_previously_created
)
1202 current_binding_level
->blocks
1203 = chainon (current_binding_level
->blocks
, block
);
1205 /* If we did not make a block for the level just exited,
1206 any blocks made for inner levels
1207 (since they cannot be recorded as subblocks in that level)
1208 must be carried forward so they will later become subblocks
1209 of something else. */
1211 current_binding_level
->blocks
1212 = chainon (current_binding_level
->blocks
, subblocks
);
1214 /* Set the TYPE_CONTEXTs for all of the tagged types belonging to this
1215 binding contour so that they point to the appropriate construct, i.e.
1216 either to the current FUNCTION_DECL node, or else to the BLOCK node
1217 we just constructed.
1219 Note that for tagged types whose scope is just the formal parameter
1220 list for some function type specification, we can't properly set
1221 their TYPE_CONTEXTs here, because we don't have a pointer to the
1222 appropriate FUNCTION_TYPE node readily available to us. For those
1223 cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set
1224 in `grokdeclarator' as soon as we have created the FUNCTION_TYPE
1225 node which will represent the "scope" for these "parameter list local"
1230 for (link
= tags
; link
; link
= TREE_CHAIN (link
))
1231 TYPE_CONTEXT (TREE_VALUE (link
)) = current_function_decl
;
1233 for (link
= tags
; link
; link
= TREE_CHAIN (link
))
1234 TYPE_CONTEXT (TREE_VALUE (link
)) = block
;
1237 TREE_USED (block
) = 1;
1241 /* Delete the node BLOCK from the current binding level.
1242 This is used for the block inside a stmt expr ({...})
1243 so that the block can be reinserted where appropriate. */
1246 delete_block (block
)
1250 if (current_binding_level
->blocks
== block
)
1251 current_binding_level
->blocks
= TREE_CHAIN (block
);
1252 for (t
= current_binding_level
->blocks
; t
;)
1254 if (TREE_CHAIN (t
) == block
)
1255 TREE_CHAIN (t
) = TREE_CHAIN (block
);
1259 TREE_CHAIN (block
) = NULL
;
1260 /* Clear TREE_USED which is always set by poplevel.
1261 The flag is set again if insert_block is called. */
1262 TREE_USED (block
) = 0;
1265 /* Insert BLOCK at the end of the list of subblocks of the
1266 current binding level. This is used when a BIND_EXPR is expanded,
1267 to handle the BLOCK node inside the BIND_EXPR. */
1270 insert_block (block
)
1273 TREE_USED (block
) = 1;
1274 current_binding_level
->blocks
1275 = chainon (current_binding_level
->blocks
, block
);
1278 /* Set the BLOCK node for the innermost scope
1279 (the one we are currently in). */
1283 register tree block
;
1285 current_binding_level
->this_block
= block
;
1291 register struct binding_level
*newlevel
;
1293 /* Reuse or create a struct for this binding level. */
1295 if (free_binding_level
)
1297 newlevel
= free_binding_level
;
1298 free_binding_level
= free_binding_level
->level_chain
;
1302 newlevel
= make_binding_level ();
1305 /* Add this level to the front of the chain (stack) of label levels. */
1307 newlevel
->level_chain
= label_level_chain
;
1308 label_level_chain
= newlevel
;
1310 newlevel
->names
= named_labels
;
1311 newlevel
->shadowed
= shadowed_labels
;
1313 shadowed_labels
= 0;
1319 register struct binding_level
*level
= label_level_chain
;
1322 /* Clear out the definitions of the declared labels in this level.
1323 Leave in the list any ordinary, non-declared labels. */
1324 for (link
= named_labels
, prev
= 0; link
;)
1326 if (C_DECLARED_LABEL_FLAG (TREE_VALUE (link
)))
1328 if (DECL_SOURCE_LINE (TREE_VALUE (link
)) == 0)
1330 error_with_decl (TREE_VALUE (link
),
1331 "label `%s' used but not defined");
1332 /* Avoid crashing later. */
1333 define_label (input_filename
, lineno
,
1334 DECL_NAME (TREE_VALUE (link
)));
1336 else if (warn_unused
&& !TREE_USED (TREE_VALUE (link
)))
1337 warning_with_decl (TREE_VALUE (link
),
1338 "label `%s' defined but not used");
1339 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link
))) = 0;
1341 /* Delete this element from the list. */
1342 link
= TREE_CHAIN (link
);
1344 TREE_CHAIN (prev
) = link
;
1346 named_labels
= link
;
1351 link
= TREE_CHAIN (link
);
1355 /* Bring back all the labels that were shadowed. */
1356 for (link
= shadowed_labels
; link
; link
= TREE_CHAIN (link
))
1357 if (DECL_NAME (TREE_VALUE (link
)) != 0)
1358 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link
)))
1359 = TREE_VALUE (link
);
1361 named_labels
= chainon (named_labels
, level
->names
);
1362 shadowed_labels
= level
->shadowed
;
1364 /* Pop the current level, and free the structure for reuse. */
1365 label_level_chain
= label_level_chain
->level_chain
;
1366 level
->level_chain
= free_binding_level
;
1367 free_binding_level
= level
;
1370 /* Push a definition or a declaration of struct, union or enum tag "name".
1371 "type" should be the type node.
1372 We assume that the tag "name" is not already defined.
1374 Note that the definition may really be just a forward reference.
1375 In that case, the TYPE_SIZE will be zero. */
1378 pushtag (name
, type
)
1381 register struct binding_level
*b
;
1383 /* Find the proper binding level for this type tag. */
1385 for (b
= current_binding_level
; b
->tag_transparent
; b
= b
->level_chain
)
1390 /* Record the identifier as the type's name if it has none. */
1392 if (TYPE_NAME (type
) == 0)
1393 TYPE_NAME (type
) = name
;
1396 if (b
== global_binding_level
)
1397 b
->tags
= perm_tree_cons (name
, type
, b
->tags
);
1399 b
->tags
= saveable_tree_cons (name
, type
, b
->tags
);
1401 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1402 tagged type we just added to the current binding level. This fake
1403 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1404 to output a representation of a tagged type, and it also gives
1405 us a convenient place to record the "scope start" address for the
1408 TYPE_STUB_DECL (type
) = pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, type
));
1410 /* An approximation for now, so we can tell this is a function-scope tag.
1411 This will be updated in poplevel. */
1412 TYPE_CONTEXT (type
) = DECL_CONTEXT (TYPE_STUB_DECL (type
));
1415 /* Handle when a new declaration NEWDECL
1416 has the same name as an old one OLDDECL
1417 in the same binding contour.
1418 Prints an error message if appropriate.
1420 If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
1421 Otherwise, return 0.
1423 When DIFFERENT_BINDING_LEVEL is true, NEWDECL is an external declaration,
1424 and OLDDECL is in an outer binding level and should thus not be changed. */
1427 duplicate_decls (newdecl
, olddecl
, different_binding_level
)
1428 register tree newdecl
, olddecl
;
1429 int different_binding_level
;
1431 int types_match
= comptypes (TREE_TYPE (newdecl
), TREE_TYPE (olddecl
));
1432 int new_is_definition
= (TREE_CODE (newdecl
) == FUNCTION_DECL
1433 && DECL_INITIAL (newdecl
) != 0);
1434 tree oldtype
= TREE_TYPE (olddecl
);
1435 tree newtype
= TREE_TYPE (newdecl
);
1438 if (TREE_CODE_CLASS (TREE_CODE (olddecl
)) == 'd')
1439 DECL_MACHINE_ATTRIBUTES (newdecl
)
1440 = merge_machine_decl_attributes (olddecl
, newdecl
);
1442 if (TREE_CODE (newtype
) == ERROR_MARK
1443 || TREE_CODE (oldtype
) == ERROR_MARK
)
1446 /* New decl is completely inconsistent with the old one =>
1447 tell caller to replace the old one.
1448 This is always an error except in the case of shadowing a builtin. */
1449 if (TREE_CODE (olddecl
) != TREE_CODE (newdecl
))
1451 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1452 && (DECL_BUILT_IN (olddecl
)
1453 || DECL_BUILT_IN_NONANSI (olddecl
)))
1455 /* If you declare a built-in or predefined function name as static,
1456 the old definition is overridden,
1457 but optionally warn this was a bad choice of name. */
1458 if (!TREE_PUBLIC (newdecl
))
1462 else if (DECL_BUILT_IN (olddecl
))
1463 warning_with_decl (newdecl
, "shadowing built-in function `%s'");
1465 warning_with_decl (newdecl
, "shadowing library function `%s'");
1467 /* Likewise, if the built-in is not ansi, then programs can
1468 override it even globally without an error. */
1469 else if (! DECL_BUILT_IN (olddecl
))
1470 warning_with_decl (newdecl
,
1471 "library function `%s' declared as non-function");
1473 else if (DECL_BUILT_IN_NONANSI (olddecl
))
1474 warning_with_decl (newdecl
,
1475 "built-in function `%s' declared as non-function");
1477 warning_with_decl (newdecl
,
1478 "built-in function `%s' declared as non-function");
1482 error_with_decl (newdecl
, "`%s' redeclared as different kind of symbol");
1483 error_with_decl (olddecl
, "previous declaration of `%s'");
1489 /* For real parm decl following a forward decl,
1490 return 1 so old decl will be reused. */
1491 if (types_match
&& TREE_CODE (newdecl
) == PARM_DECL
1492 && TREE_ASM_WRITTEN (olddecl
) && ! TREE_ASM_WRITTEN (newdecl
))
1495 /* The new declaration is the same kind of object as the old one.
1496 The declarations may partially match. Print warnings if they don't
1497 match enough. Ultimately, copy most of the information from the new
1498 decl to the old one, and keep using the old one. */
1500 if (flag_traditional
&& TREE_CODE (newdecl
) == FUNCTION_DECL
1501 && IDENTIFIER_IMPLICIT_DECL (DECL_NAME (newdecl
)) == olddecl
1502 && DECL_INITIAL (olddecl
) == 0)
1503 /* If -traditional, avoid error for redeclaring fcn
1504 after implicit decl. */
1506 else if (TREE_CODE (olddecl
) == FUNCTION_DECL
1507 && DECL_BUILT_IN (olddecl
))
1509 /* A function declaration for a built-in function. */
1510 if (!TREE_PUBLIC (newdecl
))
1512 /* If you declare a built-in function name as static, the
1513 built-in definition is overridden,
1514 but optionally warn this was a bad choice of name. */
1516 warning_with_decl (newdecl
, "shadowing built-in function `%s'");
1517 /* Discard the old built-in function. */
1520 else if (!types_match
)
1522 /* Accept the return type of the new declaration if same modes. */
1523 tree oldreturntype
= TREE_TYPE (oldtype
);
1524 tree newreturntype
= TREE_TYPE (newtype
);
1526 /* Make sure we put the new type in the same obstack as the old ones.
1527 If the old types are not both in the same obstack, use the
1529 if (TYPE_OBSTACK (oldtype
) == TYPE_OBSTACK (newtype
))
1530 push_obstacks (TYPE_OBSTACK (oldtype
), TYPE_OBSTACK (oldtype
));
1533 push_obstacks_nochange ();
1534 end_temporary_allocation ();
1537 if (TYPE_MODE (oldreturntype
) == TYPE_MODE (newreturntype
))
1539 /* Function types may be shared, so we can't just modify
1540 the return type of olddecl's function type. */
1542 = build_function_type (newreturntype
,
1543 TYPE_ARG_TYPES (oldtype
));
1545 types_match
= comptypes (newtype
, trytype
);
1549 /* Accept harmless mismatch in first argument type also.
1551 if (TYPE_ARG_TYPES (TREE_TYPE (newdecl
)) != 0
1552 && TYPE_ARG_TYPES (oldtype
) != 0
1553 && TREE_VALUE (TYPE_ARG_TYPES (newtype
)) != 0
1554 && TREE_VALUE (TYPE_ARG_TYPES (oldtype
)) != 0
1555 && (TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (newtype
)))
1556 == TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (oldtype
)))))
1558 /* Function types may be shared, so we can't just modify
1559 the return type of olddecl's function type. */
1561 = build_function_type (TREE_TYPE (oldtype
),
1562 tree_cons (NULL_TREE
,
1563 TREE_VALUE (TYPE_ARG_TYPES (newtype
)),
1564 TREE_CHAIN (TYPE_ARG_TYPES (oldtype
))));
1566 types_match
= comptypes (newtype
, trytype
);
1570 if (! different_binding_level
)
1571 TREE_TYPE (olddecl
) = oldtype
;
1577 /* If types don't match for a built-in, throw away the built-in. */
1578 warning_with_decl (newdecl
, "conflicting types for built-in function `%s'");
1582 else if (TREE_CODE (olddecl
) == FUNCTION_DECL
1583 && DECL_SOURCE_LINE (olddecl
) == 0)
1585 /* A function declaration for a predeclared function
1586 that isn't actually built in. */
1587 if (!TREE_PUBLIC (newdecl
))
1589 /* If you declare it as static, the
1590 default definition is overridden. */
1593 else if (!types_match
)
1595 /* If the types don't match, preserve volatility indication.
1596 Later on, we will discard everything else about the
1597 default declaration. */
1598 TREE_THIS_VOLATILE (newdecl
) |= TREE_THIS_VOLATILE (olddecl
);
1601 /* Permit char *foo () to match void *foo (...) if not pedantic,
1602 if one of them came from a system header file. */
1603 else if (!types_match
1604 && TREE_CODE (olddecl
) == FUNCTION_DECL
1605 && TREE_CODE (newdecl
) == FUNCTION_DECL
1606 && TREE_CODE (TREE_TYPE (oldtype
)) == POINTER_TYPE
1607 && TREE_CODE (TREE_TYPE (newtype
)) == POINTER_TYPE
1608 && (DECL_IN_SYSTEM_HEADER (olddecl
)
1609 || DECL_IN_SYSTEM_HEADER (newdecl
))
1610 && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype
))) == void_type_node
1611 && TYPE_ARG_TYPES (oldtype
) == 0
1612 && self_promoting_args_p (TYPE_ARG_TYPES (newtype
))
1613 && TREE_TYPE (TREE_TYPE (oldtype
)) == char_type_node
)
1615 (TREE_TYPE (TREE_TYPE (newtype
)) == char_type_node
1616 && TYPE_ARG_TYPES (newtype
) == 0
1617 && self_promoting_args_p (TYPE_ARG_TYPES (oldtype
))
1618 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype
))) == void_type_node
)))
1621 pedwarn_with_decl (newdecl
, "conflicting types for `%s'");
1622 /* Make sure we keep void * as ret type, not char *. */
1623 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype
))) == void_type_node
)
1624 TREE_TYPE (newdecl
) = newtype
= oldtype
;
1626 /* Set DECL_IN_SYSTEM_HEADER, so that if we see another declaration
1627 we will come back here again. */
1628 DECL_IN_SYSTEM_HEADER (newdecl
) = 1;
1630 else if (!types_match
1631 /* Permit char *foo (int, ...); followed by char *foo ();
1633 && ! (TREE_CODE (olddecl
) == FUNCTION_DECL
1635 /* Return types must still match. */
1636 && comptypes (TREE_TYPE (oldtype
),
1637 TREE_TYPE (newtype
))
1638 && TYPE_ARG_TYPES (newtype
) == 0))
1640 error_with_decl (newdecl
, "conflicting types for `%s'");
1641 /* Check for function type mismatch
1642 involving an empty arglist vs a nonempty one. */
1643 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1644 && comptypes (TREE_TYPE (oldtype
),
1645 TREE_TYPE (newtype
))
1646 && ((TYPE_ARG_TYPES (oldtype
) == 0
1647 && DECL_INITIAL (olddecl
) == 0)
1649 (TYPE_ARG_TYPES (newtype
) == 0
1650 && DECL_INITIAL (newdecl
) == 0)))
1652 /* Classify the problem further. */
1653 register tree t
= TYPE_ARG_TYPES (oldtype
);
1655 t
= TYPE_ARG_TYPES (newtype
);
1656 for (; t
; t
= TREE_CHAIN (t
))
1658 register tree type
= TREE_VALUE (t
);
1660 if (TREE_CHAIN (t
) == 0
1661 && TYPE_MAIN_VARIANT (type
) != void_type_node
)
1663 error ("A parameter list with an ellipsis can't match an empty parameter name list declaration.");
1667 if (TYPE_MAIN_VARIANT (type
) == float_type_node
1668 || C_PROMOTING_INTEGER_TYPE_P (type
))
1670 error ("An argument type that has a default promotion can't match an empty parameter name list declaration.");
1675 error_with_decl (olddecl
, "previous declaration of `%s'");
1679 errmsg
= redeclaration_error_message (newdecl
, olddecl
);
1685 error_with_decl (newdecl
, "redefinition of `%s'");
1688 error_with_decl (newdecl
, "redeclaration of `%s'");
1691 error_with_decl (newdecl
, "conflicting declarations of `%s'");
1697 error_with_decl (olddecl
,
1698 ((DECL_INITIAL (olddecl
)
1699 && current_binding_level
== global_binding_level
)
1700 ? "`%s' previously defined here"
1701 : "`%s' previously declared here"));
1703 else if (TREE_CODE (newdecl
) == TYPE_DECL
1704 && (DECL_IN_SYSTEM_HEADER (olddecl
)
1705 || DECL_IN_SYSTEM_HEADER (newdecl
)))
1707 warning_with_decl (newdecl
, "redefinition of `%s'");
1710 ((DECL_INITIAL (olddecl
)
1711 && current_binding_level
== global_binding_level
)
1712 ? "`%s' previously defined here"
1713 : "`%s' previously declared here"));
1715 else if (TREE_CODE (olddecl
) == FUNCTION_DECL
1716 && DECL_INITIAL (olddecl
) != 0
1717 && TYPE_ARG_TYPES (oldtype
) == 0
1718 && TYPE_ARG_TYPES (newtype
) != 0
1719 && TYPE_ACTUAL_ARG_TYPES (oldtype
) != 0)
1721 register tree type
, parm
;
1723 /* Prototype decl follows defn w/o prototype. */
1725 for (parm
= TYPE_ACTUAL_ARG_TYPES (oldtype
),
1726 type
= TYPE_ARG_TYPES (newtype
),
1729 parm
= TREE_CHAIN (parm
), type
= TREE_CHAIN (type
), nargs
++)
1731 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm
)) == void_type_node
1732 && TYPE_MAIN_VARIANT (TREE_VALUE (type
)) == void_type_node
)
1734 warning_with_decl (newdecl
, "prototype for `%s' follows");
1735 warning_with_decl (olddecl
, "non-prototype definition here");
1738 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm
)) == void_type_node
1739 || TYPE_MAIN_VARIANT (TREE_VALUE (type
)) == void_type_node
)
1741 error_with_decl (newdecl
, "prototype for `%s' follows and number of arguments doesn't match");
1742 error_with_decl (olddecl
, "non-prototype definition here");
1746 /* Type for passing arg must be consistent
1747 with that declared for the arg. */
1748 if (! comptypes (TREE_VALUE (parm
), TREE_VALUE (type
))
1749 /* If -traditional, allow `unsigned int' instead of `int'
1750 in the prototype. */
1751 && (! (flag_traditional
1752 && TYPE_MAIN_VARIANT (TREE_VALUE (parm
)) == integer_type_node
1753 && TYPE_MAIN_VARIANT (TREE_VALUE (type
)) == unsigned_type_node
)))
1755 error_with_decl (newdecl
,
1756 "prototype for `%s' follows and argument %d doesn't match",
1758 error_with_decl (olddecl
, "non-prototype definition here");
1764 /* Warn about mismatches in various flags. */
1767 /* Warn if function is now inline
1768 but was previously declared not inline and has been called. */
1769 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1770 && ! DECL_INLINE (olddecl
) && DECL_INLINE (newdecl
)
1771 && TREE_USED (olddecl
))
1772 warning_with_decl (newdecl
,
1773 "`%s' declared inline after being called");
1774 if (TREE_CODE (olddecl
) == FUNCTION_DECL
1775 && ! DECL_INLINE (olddecl
) && DECL_INLINE (newdecl
)
1776 && DECL_INITIAL (olddecl
) != 0)
1777 warning_with_decl (newdecl
,
1778 "`%s' declared inline after its definition");
1780 /* If pedantic, warn when static declaration follows a non-static
1781 declaration. Otherwise, do so only for functions. */
1782 if ((pedantic
|| TREE_CODE (olddecl
) == FUNCTION_DECL
)
1783 && TREE_PUBLIC (olddecl
)
1784 && !TREE_PUBLIC (newdecl
))
1785 warning_with_decl (newdecl
, "static declaration for `%s' follows non-static");
1787 /* If warn_traditional, warn when a non-static function
1788 declaration follows a static one. */
1789 if (warn_traditional
1790 && TREE_CODE (olddecl
) == FUNCTION_DECL
1791 && !TREE_PUBLIC (olddecl
)
1792 && TREE_PUBLIC (newdecl
))
1793 warning_with_decl (newdecl
, "non-static declaration for `%s' follows static");
1795 /* Warn when const declaration follows a non-const
1796 declaration, but not for functions. */
1797 if (TREE_CODE (olddecl
) != FUNCTION_DECL
1798 && !TREE_READONLY (olddecl
)
1799 && TREE_READONLY (newdecl
))
1800 warning_with_decl (newdecl
, "const declaration for `%s' follows non-const");
1801 /* These bits are logically part of the type, for variables.
1802 But not for functions
1803 (where qualifiers are not valid ANSI anyway). */
1804 else if (pedantic
&& TREE_CODE (olddecl
) != FUNCTION_DECL
1805 && (TREE_READONLY (newdecl
) != TREE_READONLY (olddecl
)
1806 || TREE_THIS_VOLATILE (newdecl
) != TREE_THIS_VOLATILE (olddecl
)))
1807 pedwarn_with_decl (newdecl
, "type qualifiers for `%s' conflict with previous decl");
1811 /* Optionally warn about more than one declaration for the same name. */
1812 if (errmsg
== 0 && warn_redundant_decls
&& DECL_SOURCE_LINE (olddecl
) != 0
1813 /* Don't warn about a function declaration
1814 followed by a definition. */
1815 && !(TREE_CODE (newdecl
) == FUNCTION_DECL
&& DECL_INITIAL (newdecl
) != 0
1816 && DECL_INITIAL (olddecl
) == 0)
1817 /* Don't warn about extern decl followed by (tentative) definition. */
1818 && !(DECL_EXTERNAL (olddecl
) && ! DECL_EXTERNAL (newdecl
)))
1820 warning_with_decl (newdecl
, "redundant redeclaration of `%s' in same scope");
1821 warning_with_decl (olddecl
, "previous declaration of `%s'");
1824 /* Copy all the DECL_... slots specified in the new decl
1825 except for any that we copy here from the old type.
1827 Past this point, we don't change OLDTYPE and NEWTYPE
1828 even if we change the types of NEWDECL and OLDDECL. */
1832 /* When copying info to olddecl, we store into write_olddecl
1833 instead. This allows us to avoid modifying olddecl when
1834 different_binding_level is true. */
1835 tree write_olddecl
= different_binding_level
? newdecl
: olddecl
;
1837 /* Make sure we put the new type in the same obstack as the old ones.
1838 If the old types are not both in the same obstack, use the permanent
1840 if (TYPE_OBSTACK (oldtype
) == TYPE_OBSTACK (newtype
))
1841 push_obstacks (TYPE_OBSTACK (oldtype
), TYPE_OBSTACK (oldtype
));
1844 push_obstacks_nochange ();
1845 end_temporary_allocation ();
1848 /* Merge the data types specified in the two decls. */
1849 if (TREE_CODE (newdecl
) != FUNCTION_DECL
|| !DECL_BUILT_IN (olddecl
))
1851 if (different_binding_level
)
1853 = build_type_attribute_variant
1855 merge_attributes (TYPE_ATTRIBUTES (newtype
),
1856 TYPE_ATTRIBUTES (oldtype
)));
1859 = TREE_TYPE (olddecl
)
1860 = common_type (newtype
, oldtype
);
1863 /* Lay the type out, unless already done. */
1864 if (oldtype
!= TREE_TYPE (newdecl
))
1866 if (TREE_TYPE (newdecl
) != error_mark_node
)
1867 layout_type (TREE_TYPE (newdecl
));
1868 if (TREE_CODE (newdecl
) != FUNCTION_DECL
1869 && TREE_CODE (newdecl
) != TYPE_DECL
1870 && TREE_CODE (newdecl
) != CONST_DECL
)
1871 layout_decl (newdecl
, 0);
1875 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1876 DECL_SIZE (newdecl
) = DECL_SIZE (olddecl
);
1877 if (TREE_CODE (olddecl
) != FUNCTION_DECL
)
1878 if (DECL_ALIGN (olddecl
) > DECL_ALIGN (newdecl
))
1879 DECL_ALIGN (newdecl
) = DECL_ALIGN (olddecl
);
1882 /* Keep the old rtl since we can safely use it. */
1883 DECL_RTL (newdecl
) = DECL_RTL (olddecl
);
1885 /* Merge the type qualifiers. */
1886 if (DECL_BUILT_IN_NONANSI (olddecl
) && TREE_THIS_VOLATILE (olddecl
)
1887 && !TREE_THIS_VOLATILE (newdecl
))
1888 TREE_THIS_VOLATILE (write_olddecl
) = 0;
1889 if (TREE_READONLY (newdecl
))
1890 TREE_READONLY (write_olddecl
) = 1;
1891 if (TREE_THIS_VOLATILE (newdecl
))
1893 TREE_THIS_VOLATILE (write_olddecl
) = 1;
1894 if (TREE_CODE (newdecl
) == VAR_DECL
)
1895 make_var_volatile (newdecl
);
1898 /* Keep source location of definition rather than declaration. */
1899 /* When called with different_binding_level set, keep the old
1900 information so that meaningful diagnostics can be given. */
1901 if (DECL_INITIAL (newdecl
) == 0 && DECL_INITIAL (olddecl
) != 0
1902 && ! different_binding_level
)
1904 DECL_SOURCE_LINE (newdecl
) = DECL_SOURCE_LINE (olddecl
);
1905 DECL_SOURCE_FILE (newdecl
) = DECL_SOURCE_FILE (olddecl
);
1908 /* Merge the unused-warning information. */
1909 if (DECL_IN_SYSTEM_HEADER (olddecl
))
1910 DECL_IN_SYSTEM_HEADER (newdecl
) = 1;
1911 else if (DECL_IN_SYSTEM_HEADER (newdecl
))
1912 DECL_IN_SYSTEM_HEADER (write_olddecl
) = 1;
1914 /* Merge the initialization information. */
1915 /* When called with different_binding_level set, don't copy over
1916 DECL_INITIAL, so that we don't accidentally change function
1917 declarations into function definitions. */
1918 if (DECL_INITIAL (newdecl
) == 0 && ! different_binding_level
)
1919 DECL_INITIAL (newdecl
) = DECL_INITIAL (olddecl
);
1921 /* Merge the section attribute.
1922 We want to issue an error if the sections conflict but that must be
1923 done later in decl_attributes since we are called before attributes
1925 if (DECL_SECTION_NAME (newdecl
) == NULL_TREE
)
1926 DECL_SECTION_NAME (newdecl
) = DECL_SECTION_NAME (olddecl
);
1928 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1930 DECL_STATIC_CONSTRUCTOR(newdecl
) |= DECL_STATIC_CONSTRUCTOR(olddecl
);
1931 DECL_STATIC_DESTRUCTOR (newdecl
) |= DECL_STATIC_DESTRUCTOR (olddecl
);
1933 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl
)
1934 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl
);
1935 DECL_NO_CHECK_MEMORY_USAGE (newdecl
)
1936 |= DECL_NO_CHECK_MEMORY_USAGE (olddecl
);
1941 /* If cannot merge, then use the new type and qualifiers,
1942 and don't preserve the old rtl. */
1943 else if (! different_binding_level
)
1945 TREE_TYPE (olddecl
) = TREE_TYPE (newdecl
);
1946 TREE_READONLY (olddecl
) = TREE_READONLY (newdecl
);
1947 TREE_THIS_VOLATILE (olddecl
) = TREE_THIS_VOLATILE (newdecl
);
1948 TREE_SIDE_EFFECTS (olddecl
) = TREE_SIDE_EFFECTS (newdecl
);
1951 /* Merge the storage class information. */
1952 DECL_WEAK (newdecl
) |= DECL_WEAK (olddecl
);
1953 /* For functions, static overrides non-static. */
1954 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1956 TREE_PUBLIC (newdecl
) &= TREE_PUBLIC (olddecl
);
1957 /* This is since we don't automatically
1958 copy the attributes of NEWDECL into OLDDECL. */
1959 /* No need to worry about different_binding_level here because
1960 then TREE_PUBLIC (newdecl) was true. */
1961 TREE_PUBLIC (olddecl
) = TREE_PUBLIC (newdecl
);
1962 /* If this clears `static', clear it in the identifier too. */
1963 if (! TREE_PUBLIC (olddecl
))
1964 TREE_PUBLIC (DECL_NAME (olddecl
)) = 0;
1966 if (DECL_EXTERNAL (newdecl
))
1968 TREE_STATIC (newdecl
) = TREE_STATIC (olddecl
);
1969 DECL_EXTERNAL (newdecl
) = DECL_EXTERNAL (olddecl
);
1970 /* An extern decl does not override previous storage class. */
1971 TREE_PUBLIC (newdecl
) = TREE_PUBLIC (olddecl
);
1972 if (! DECL_EXTERNAL (newdecl
))
1973 DECL_CONTEXT (newdecl
) = DECL_CONTEXT (olddecl
);
1977 TREE_STATIC (olddecl
) = TREE_STATIC (newdecl
);
1978 TREE_PUBLIC (olddecl
) = TREE_PUBLIC (newdecl
);
1981 /* If either decl says `inline', this fn is inline,
1982 unless its definition was passed already. */
1983 if (DECL_INLINE (newdecl
) && DECL_INITIAL (olddecl
) == 0)
1984 DECL_INLINE (olddecl
) = 1;
1985 DECL_INLINE (newdecl
) = DECL_INLINE (olddecl
);
1987 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
1989 if (DECL_BUILT_IN (olddecl
))
1991 /* Get rid of any built-in function if new arg types don't match it
1992 or if we have a function definition. */
1993 if (! types_match
|| new_is_definition
)
1995 if (! different_binding_level
)
1997 TREE_TYPE (olddecl
) = TREE_TYPE (newdecl
);
1998 DECL_BUILT_IN (olddecl
) = 0;
2003 /* If redeclaring a builtin function, and not a definition,
2004 it stays built in. */
2005 DECL_BUILT_IN (newdecl
) = 1;
2006 DECL_FUNCTION_CODE (newdecl
) = DECL_FUNCTION_CODE (olddecl
);
2009 /* Also preserve various other info from the definition. */
2010 else if (! new_is_definition
)
2011 DECL_FRAME_SIZE (newdecl
) = DECL_FRAME_SIZE (olddecl
);
2012 if (! new_is_definition
)
2014 DECL_RESULT (newdecl
) = DECL_RESULT (olddecl
);
2015 /* When called with different_binding_level set, don't copy over
2016 DECL_INITIAL, so that we don't accidentally change function
2017 declarations into function definitions. */
2018 if (! different_binding_level
)
2019 DECL_INITIAL (newdecl
) = DECL_INITIAL (olddecl
);
2020 DECL_SAVED_INSNS (newdecl
) = DECL_SAVED_INSNS (olddecl
);
2021 DECL_ARGUMENTS (newdecl
) = DECL_ARGUMENTS (olddecl
);
2022 if (DECL_INLINE (newdecl
))
2023 DECL_ABSTRACT_ORIGIN (newdecl
) = DECL_ORIGIN (olddecl
);
2026 if (different_binding_level
)
2028 /* Don't output a duplicate symbol or debugging information for this
2031 Do not set TREE_ASM_WRITTEN for a FUNCTION_DECL since we may actually
2032 just have two declarations without a definition. VAR_DECLs may need
2033 the same treatment, I'm not sure. */
2034 if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2035 DECL_IGNORED_P (newdecl
) = 1;
2037 TREE_ASM_WRITTEN (newdecl
) = DECL_IGNORED_P (newdecl
) = 1;
2041 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
2042 But preserve OLDDECL's DECL_UID. */
2044 register unsigned olddecl_uid
= DECL_UID (olddecl
);
2046 bcopy ((char *) newdecl
+ sizeof (struct tree_common
),
2047 (char *) olddecl
+ sizeof (struct tree_common
),
2048 sizeof (struct tree_decl
) - sizeof (struct tree_common
));
2049 DECL_UID (olddecl
) = olddecl_uid
;
2052 /* NEWDECL contains the merged attribute lists.
2053 Update OLDDECL to be the same. */
2054 DECL_MACHINE_ATTRIBUTES (olddecl
) = DECL_MACHINE_ATTRIBUTES (newdecl
);
2059 /* Record a decl-node X as belonging to the current lexical scope.
2060 Check for errors (such as an incompatible declaration for the same
2061 name already seen in the same scope).
2063 Returns either X or an old decl for the same name.
2064 If an old decl is returned, it may have been smashed
2065 to agree with what X says. */
2072 register tree name
= DECL_NAME (x
);
2073 register struct binding_level
*b
= current_binding_level
;
2075 DECL_CONTEXT (x
) = current_function_decl
;
2076 /* A local extern declaration for a function doesn't constitute nesting.
2077 A local auto declaration does, since it's a forward decl
2078 for a nested function coming later. */
2079 if (TREE_CODE (x
) == FUNCTION_DECL
&& DECL_INITIAL (x
) == 0
2080 && DECL_EXTERNAL (x
))
2081 DECL_CONTEXT (x
) = 0;
2083 if (warn_nested_externs
&& DECL_EXTERNAL (x
) && b
!= global_binding_level
2084 && x
!= IDENTIFIER_IMPLICIT_DECL (name
)
2085 /* Don't print error messages for __FUNCTION__ and __PRETTY_FUNCTION__ */
2086 && !DECL_IN_SYSTEM_HEADER (x
))
2087 warning ("nested extern declaration of `%s'", IDENTIFIER_POINTER (name
));
2093 int different_binding_level
= 0;
2095 t
= lookup_name_current_level (name
);
2096 /* Don't type check externs here when -traditional. This is so that
2097 code with conflicting declarations inside blocks will get warnings
2098 not errors. X11 for instance depends on this. */
2099 if (! t
&& DECL_EXTERNAL (x
) && TREE_PUBLIC (x
) && ! flag_traditional
)
2101 t
= IDENTIFIER_GLOBAL_VALUE (name
);
2102 /* Type decls at global scope don't conflict with externs declared
2103 inside lexical blocks. */
2104 if (t
&& TREE_CODE (t
) == TYPE_DECL
)
2106 different_binding_level
= 1;
2108 if (t
!= 0 && t
== error_mark_node
)
2109 /* error_mark_node is 0 for a while during initialization! */
2112 error_with_decl (x
, "`%s' used prior to declaration");
2117 file
= DECL_SOURCE_FILE (t
);
2118 line
= DECL_SOURCE_LINE (t
);
2121 /* If this decl is `static' and an implicit decl was seen previously,
2122 warn. But don't complain if -traditional,
2123 since traditional compilers don't complain. */
2124 if (! flag_traditional
&& TREE_PUBLIC (name
)
2125 /* Don't test for DECL_EXTERNAL, because grokdeclarator
2126 sets this for all functions. */
2127 && ! TREE_PUBLIC (x
)
2128 && (TREE_CODE (x
) == FUNCTION_DECL
|| b
== global_binding_level
)
2129 /* We used to warn also for explicit extern followed by static,
2130 but sometimes you need to do it that way. */
2131 && IDENTIFIER_IMPLICIT_DECL (name
) != 0)
2133 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2134 IDENTIFIER_POINTER (name
));
2135 pedwarn_with_file_and_line
2136 (DECL_SOURCE_FILE (IDENTIFIER_IMPLICIT_DECL (name
)),
2137 DECL_SOURCE_LINE (IDENTIFIER_IMPLICIT_DECL (name
)),
2138 "previous declaration of `%s'",
2139 IDENTIFIER_POINTER (name
));
2140 TREE_THIS_VOLATILE (name
) = 1;
2143 if (t
!= 0 && duplicate_decls (x
, t
, different_binding_level
))
2145 if (TREE_CODE (t
) == PARM_DECL
)
2147 /* Don't allow more than one "real" duplicate
2148 of a forward parm decl. */
2149 TREE_ASM_WRITTEN (t
) = TREE_ASM_WRITTEN (x
);
2155 /* If we are processing a typedef statement, generate a whole new
2156 ..._TYPE node (which will be just an variant of the existing
2157 ..._TYPE node with identical properties) and then install the
2158 TYPE_DECL node generated to represent the typedef name as the
2159 TYPE_NAME of this brand new (duplicate) ..._TYPE node.
2161 The whole point here is to end up with a situation where each
2162 and every ..._TYPE node the compiler creates will be uniquely
2163 associated with AT MOST one node representing a typedef name.
2164 This way, even though the compiler substitutes corresponding
2165 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
2166 early on, later parts of the compiler can always do the reverse
2167 translation and get back the corresponding typedef name. For
2170 typedef struct S MY_TYPE;
2173 Later parts of the compiler might only know that `object' was of
2174 type `struct S' if it were not for code just below. With this
2175 code however, later parts of the compiler see something like:
2177 struct S' == struct S
2178 typedef struct S' MY_TYPE;
2181 And they can then deduce (from the node for type struct S') that
2182 the original object declaration was:
2186 Being able to do this is important for proper support of protoize,
2187 and also for generating precise symbolic debugging information
2188 which takes full account of the programmer's (typedef) vocabulary.
2190 Obviously, we don't want to generate a duplicate ..._TYPE node if
2191 the TYPE_DECL node that we are now processing really represents a
2192 standard built-in type.
2194 Since all standard types are effectively declared at line zero
2195 in the source file, we can easily check to see if we are working
2196 on a standard type by checking the current value of lineno. */
2198 if (TREE_CODE (x
) == TYPE_DECL
)
2200 if (DECL_SOURCE_LINE (x
) == 0)
2202 if (TYPE_NAME (TREE_TYPE (x
)) == 0)
2203 TYPE_NAME (TREE_TYPE (x
)) = x
;
2205 else if (TREE_TYPE (x
) != error_mark_node
2206 && DECL_ORIGINAL_TYPE (x
) == NULL_TREE
)
2208 tree tt
= TREE_TYPE (x
);
2209 DECL_ORIGINAL_TYPE (x
) = tt
;
2210 tt
= build_type_copy (tt
);
2216 /* Multiple external decls of the same identifier ought to match.
2217 Check against both global declarations (when traditional) and out of
2218 scope (limbo) block level declarations.
2220 We get warnings about inline functions where they are defined.
2221 Avoid duplicate warnings where they are used. */
2222 if (TREE_PUBLIC (x
) && ! DECL_INLINE (x
))
2226 if (flag_traditional
&& IDENTIFIER_GLOBAL_VALUE (name
) != 0
2227 && (DECL_EXTERNAL (IDENTIFIER_GLOBAL_VALUE (name
))
2228 || TREE_PUBLIC (IDENTIFIER_GLOBAL_VALUE (name
))))
2229 decl
= IDENTIFIER_GLOBAL_VALUE (name
);
2230 else if (IDENTIFIER_LIMBO_VALUE (name
) != 0)
2231 /* Decls in limbo are always extern, so no need to check that. */
2232 decl
= IDENTIFIER_LIMBO_VALUE (name
);
2236 if (decl
&& ! comptypes (TREE_TYPE (x
), TREE_TYPE (decl
))
2237 /* If old decl is built-in, we already warned if we should. */
2238 && !DECL_BUILT_IN (decl
))
2240 pedwarn_with_decl (x
,
2241 "type mismatch with previous external decl");
2242 pedwarn_with_decl (decl
, "previous external decl of `%s'");
2246 /* If a function has had an implicit declaration, and then is defined,
2247 make sure they are compatible. */
2249 if (IDENTIFIER_IMPLICIT_DECL (name
) != 0
2250 && IDENTIFIER_GLOBAL_VALUE (name
) == 0
2251 && TREE_CODE (x
) == FUNCTION_DECL
2252 && ! comptypes (TREE_TYPE (x
),
2253 TREE_TYPE (IDENTIFIER_IMPLICIT_DECL (name
))))
2255 warning_with_decl (x
, "type mismatch with previous implicit declaration");
2256 warning_with_decl (IDENTIFIER_IMPLICIT_DECL (name
),
2257 "previous implicit declaration of `%s'");
2260 /* In PCC-compatibility mode, extern decls of vars with no current decl
2261 take effect at top level no matter where they are. */
2262 if (flag_traditional
&& DECL_EXTERNAL (x
)
2263 && lookup_name (name
) == 0)
2265 tree type
= TREE_TYPE (x
);
2267 /* But don't do this if the type contains temporary nodes. */
2270 if (type
== error_mark_node
)
2272 if (! TREE_PERMANENT (type
))
2274 warning_with_decl (x
, "type of external `%s' is not global");
2275 /* By exiting the loop early, we leave TYPE nonzero,
2276 and thus prevent globalization of the decl. */
2279 else if (TREE_CODE (type
) == FUNCTION_TYPE
2280 && TYPE_ARG_TYPES (type
) != 0)
2281 /* The types might not be truly local,
2282 but the list of arg types certainly is temporary.
2283 Since prototypes are nontraditional,
2284 ok not to do the traditional thing. */
2286 type
= TREE_TYPE (type
);
2290 b
= global_binding_level
;
2293 /* This name is new in its binding level.
2294 Install the new declaration and return it. */
2295 if (b
== global_binding_level
)
2297 /* Install a global value. */
2299 /* If the first global decl has external linkage,
2300 warn if we later see static one. */
2301 if (IDENTIFIER_GLOBAL_VALUE (name
) == 0 && TREE_PUBLIC (x
))
2302 TREE_PUBLIC (name
) = 1;
2304 IDENTIFIER_GLOBAL_VALUE (name
) = x
;
2306 /* We no longer care about any previous block level declarations. */
2307 IDENTIFIER_LIMBO_VALUE (name
) = 0;
2309 /* Don't forget if the function was used via an implicit decl. */
2310 if (IDENTIFIER_IMPLICIT_DECL (name
)
2311 && TREE_USED (IDENTIFIER_IMPLICIT_DECL (name
)))
2312 TREE_USED (x
) = 1, TREE_USED (name
) = 1;
2314 /* Don't forget if its address was taken in that way. */
2315 if (IDENTIFIER_IMPLICIT_DECL (name
)
2316 && TREE_ADDRESSABLE (IDENTIFIER_IMPLICIT_DECL (name
)))
2317 TREE_ADDRESSABLE (x
) = 1;
2319 /* Warn about mismatches against previous implicit decl. */
2320 if (IDENTIFIER_IMPLICIT_DECL (name
) != 0
2321 /* If this real decl matches the implicit, don't complain. */
2322 && ! (TREE_CODE (x
) == FUNCTION_DECL
2323 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (x
)))
2324 == integer_type_node
)))
2325 pedwarn ("`%s' was previously implicitly declared to return `int'",
2326 IDENTIFIER_POINTER (name
));
2328 /* If this decl is `static' and an `extern' was seen previously,
2329 that is erroneous. */
2330 if (TREE_PUBLIC (name
)
2331 && ! TREE_PUBLIC (x
) && ! DECL_EXTERNAL (x
))
2333 /* Okay to redeclare an ANSI built-in as static. */
2334 if (t
!= 0 && DECL_BUILT_IN (t
))
2336 /* Okay to declare a non-ANSI built-in as anything. */
2337 else if (t
!= 0 && DECL_BUILT_IN_NONANSI (t
))
2339 /* Okay to have global type decl after an earlier extern
2340 declaration inside a lexical block. */
2341 else if (TREE_CODE (x
) == TYPE_DECL
)
2343 else if (IDENTIFIER_IMPLICIT_DECL (name
))
2345 if (! TREE_THIS_VOLATILE (name
))
2346 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2347 IDENTIFIER_POINTER (name
));
2350 pedwarn ("`%s' was declared `extern' and later `static'",
2351 IDENTIFIER_POINTER (name
));
2356 /* Here to install a non-global value. */
2357 tree oldlocal
= IDENTIFIER_LOCAL_VALUE (name
);
2358 tree oldglobal
= IDENTIFIER_GLOBAL_VALUE (name
);
2359 IDENTIFIER_LOCAL_VALUE (name
) = x
;
2361 /* If this is an extern function declaration, see if we
2362 have a global definition or declaration for the function. */
2364 && DECL_EXTERNAL (x
) && !DECL_INLINE (x
)
2366 && TREE_CODE (x
) == FUNCTION_DECL
2367 && TREE_CODE (oldglobal
) == FUNCTION_DECL
)
2369 /* We have one. Their types must agree. */
2370 if (! comptypes (TREE_TYPE (x
),
2371 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (name
))))
2372 pedwarn_with_decl (x
, "extern declaration of `%s' doesn't match global one");
2375 /* Inner extern decl is inline if global one is.
2376 Copy enough to really inline it. */
2377 if (DECL_INLINE (oldglobal
))
2379 DECL_INLINE (x
) = DECL_INLINE (oldglobal
);
2380 DECL_INITIAL (x
) = (current_function_decl
== oldglobal
2381 ? 0 : DECL_INITIAL (oldglobal
));
2382 DECL_SAVED_INSNS (x
) = DECL_SAVED_INSNS (oldglobal
);
2383 DECL_FRAME_SIZE (x
) = DECL_FRAME_SIZE (oldglobal
);
2384 DECL_ARGUMENTS (x
) = DECL_ARGUMENTS (oldglobal
);
2385 DECL_RESULT (x
) = DECL_RESULT (oldglobal
);
2386 TREE_ASM_WRITTEN (x
) = TREE_ASM_WRITTEN (oldglobal
);
2387 DECL_ABSTRACT_ORIGIN (x
) = DECL_ORIGIN (oldglobal
);
2389 /* Inner extern decl is built-in if global one is. */
2390 if (DECL_BUILT_IN (oldglobal
))
2392 DECL_BUILT_IN (x
) = DECL_BUILT_IN (oldglobal
);
2393 DECL_FUNCTION_CODE (x
) = DECL_FUNCTION_CODE (oldglobal
);
2395 /* Keep the arg types from a file-scope fcn defn. */
2396 if (TYPE_ARG_TYPES (TREE_TYPE (oldglobal
)) != 0
2397 && DECL_INITIAL (oldglobal
)
2398 && TYPE_ARG_TYPES (TREE_TYPE (x
)) == 0)
2399 TREE_TYPE (x
) = TREE_TYPE (oldglobal
);
2403 #if 0 /* This case is probably sometimes the right thing to do. */
2404 /* If we have a local external declaration,
2405 then any file-scope declaration should not
2406 have been static. */
2407 if (oldlocal
== 0 && oldglobal
!= 0
2408 && !TREE_PUBLIC (oldglobal
)
2409 && DECL_EXTERNAL (x
) && TREE_PUBLIC (x
))
2410 warning ("`%s' locally external but globally static",
2411 IDENTIFIER_POINTER (name
));
2414 /* If we have a local external declaration,
2415 and no file-scope declaration has yet been seen,
2416 then if we later have a file-scope decl it must not be static. */
2418 && DECL_EXTERNAL (x
)
2422 TREE_PUBLIC (name
) = 1;
2424 /* Save this decl, so that we can do type checking against
2425 other decls after it falls out of scope.
2427 Only save it once. This prevents temporary decls created in
2428 expand_inline_function from being used here, since this
2429 will have been set when the inline function was parsed.
2430 It also helps give slightly better warnings. */
2431 if (IDENTIFIER_LIMBO_VALUE (name
) == 0)
2432 IDENTIFIER_LIMBO_VALUE (name
) = x
;
2435 /* Warn if shadowing an argument at the top level of the body. */
2436 if (oldlocal
!= 0 && !DECL_EXTERNAL (x
)
2437 /* This warning doesn't apply to the parms of a nested fcn. */
2438 && ! current_binding_level
->parm_flag
2439 /* Check that this is one level down from the parms. */
2440 && current_binding_level
->level_chain
->parm_flag
2441 /* Check that the decl being shadowed
2442 comes from the parm level, one level up. */
2443 && chain_member (oldlocal
, current_binding_level
->level_chain
->names
))
2445 if (TREE_CODE (oldlocal
) == PARM_DECL
)
2446 pedwarn ("declaration of `%s' shadows a parameter",
2447 IDENTIFIER_POINTER (name
));
2449 pedwarn ("declaration of `%s' shadows a symbol from the parameter list",
2450 IDENTIFIER_POINTER (name
));
2453 /* Maybe warn if shadowing something else. */
2454 else if (warn_shadow
&& !DECL_EXTERNAL (x
)
2455 /* No shadow warnings for internally generated vars. */
2456 && DECL_SOURCE_LINE (x
) != 0
2457 /* No shadow warnings for vars made for inlining. */
2458 && ! DECL_FROM_INLINE (x
))
2460 char *id
= IDENTIFIER_POINTER (name
);
2462 if (TREE_CODE (x
) == PARM_DECL
2463 && current_binding_level
->level_chain
->parm_flag
)
2464 /* Don't warn about the parm names in function declarator
2465 within a function declarator.
2466 It would be nice to avoid warning in any function
2467 declarator in a declaration, as opposed to a definition,
2468 but there is no way to tell it's not a definition. */
2470 else if (oldlocal
!= 0 && TREE_CODE (oldlocal
) == PARM_DECL
)
2471 warning ("declaration of `%s' shadows a parameter", id
);
2472 else if (oldlocal
!= 0)
2473 warning ("declaration of `%s' shadows previous local", id
);
2474 else if (IDENTIFIER_GLOBAL_VALUE (name
) != 0
2475 && IDENTIFIER_GLOBAL_VALUE (name
) != error_mark_node
)
2476 warning ("declaration of `%s' shadows global declaration", id
);
2479 /* If storing a local value, there may already be one (inherited).
2480 If so, record it for restoration when this binding level ends. */
2482 b
->shadowed
= tree_cons (name
, oldlocal
, b
->shadowed
);
2485 /* Keep count of variables in this level with incomplete type. */
2486 if (TYPE_SIZE (TREE_TYPE (x
)) == 0)
2490 /* Put decls on list in reverse order.
2491 We will reverse them later if necessary. */
2492 TREE_CHAIN (x
) = b
->names
;
2498 /* Like pushdecl, only it places X in GLOBAL_BINDING_LEVEL, if appropriate. */
2501 pushdecl_top_level (x
)
2505 register struct binding_level
*b
= current_binding_level
;
2507 current_binding_level
= global_binding_level
;
2509 current_binding_level
= b
;
2513 /* Generate an implicit declaration for identifier FUNCTIONID
2514 as a function of type int (). Print a warning if appropriate. */
2517 implicitly_declare (functionid
)
2521 int traditional_warning
= 0;
2522 /* Only one "implicit declaration" warning per identifier. */
2523 int implicit_warning
;
2525 /* Save the decl permanently so we can warn if definition follows. */
2526 push_obstacks_nochange ();
2527 end_temporary_allocation ();
2529 /* We used to reuse an old implicit decl here,
2530 but this loses with inline functions because it can clobber
2531 the saved decl chains. */
2532 /* if (IDENTIFIER_IMPLICIT_DECL (functionid) != 0)
2533 decl = IDENTIFIER_IMPLICIT_DECL (functionid);
2535 decl
= build_decl (FUNCTION_DECL
, functionid
, default_function_type
);
2537 /* Warn of implicit decl following explicit local extern decl.
2538 This is probably a program designed for traditional C. */
2539 if (TREE_PUBLIC (functionid
) && IDENTIFIER_GLOBAL_VALUE (functionid
) == 0)
2540 traditional_warning
= 1;
2542 /* Warn once of an implicit declaration. */
2543 implicit_warning
= (IDENTIFIER_IMPLICIT_DECL (functionid
) == 0);
2545 DECL_EXTERNAL (decl
) = 1;
2546 TREE_PUBLIC (decl
) = 1;
2548 /* Record that we have an implicit decl and this is it. */
2549 IDENTIFIER_IMPLICIT_DECL (functionid
) = decl
;
2551 /* ANSI standard says implicit declarations are in the innermost block.
2552 So we record the decl in the standard fashion.
2553 If flag_traditional is set, pushdecl does it top-level. */
2556 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
2557 maybe_objc_check_decl (decl
);
2559 rest_of_decl_compilation (decl
, NULL_PTR
, 0, 0);
2561 if (mesg_implicit_function_declaration
&& implicit_warning
)
2563 if (mesg_implicit_function_declaration
== 2)
2564 error ("implicit declaration of function `%s'",
2565 IDENTIFIER_POINTER (functionid
));
2567 warning ("implicit declaration of function `%s'",
2568 IDENTIFIER_POINTER (functionid
));
2570 else if (warn_traditional
&& traditional_warning
)
2571 warning ("function `%s' was previously declared within a block",
2572 IDENTIFIER_POINTER (functionid
));
2574 /* Write a record describing this implicit function declaration to the
2575 prototypes file (if requested). */
2577 gen_aux_info_record (decl
, 0, 1, 0);
2584 /* Return zero if the declaration NEWDECL is valid
2585 when the declaration OLDDECL (assumed to be for the same name)
2586 has already been seen.
2587 Otherwise return 1 if NEWDECL is a redefinition, 2 if it is a redeclaration,
2588 and 3 if it is a conflicting declaration. */
2591 redeclaration_error_message (newdecl
, olddecl
)
2592 tree newdecl
, olddecl
;
2594 if (TREE_CODE (newdecl
) == TYPE_DECL
)
2596 if (flag_traditional
&& TREE_TYPE (newdecl
) == TREE_TYPE (olddecl
))
2598 /* pushdecl creates distinct types for TYPE_DECLs by calling
2599 build_type_copy, so the above comparison generally fails. We do
2600 another test against the TYPE_MAIN_VARIANT of the olddecl, which
2601 is equivalent to what this code used to do before the build_type_copy
2602 call. The variant type distinction should not matter for traditional
2603 code, because it doesn't have type qualifiers. */
2604 if (flag_traditional
2605 && TYPE_MAIN_VARIANT (TREE_TYPE (olddecl
)) == TREE_TYPE (newdecl
))
2607 if (DECL_IN_SYSTEM_HEADER (olddecl
) || DECL_IN_SYSTEM_HEADER (newdecl
))
2611 else if (TREE_CODE (newdecl
) == FUNCTION_DECL
)
2613 /* Declarations of functions can insist on internal linkage
2614 but they can't be inconsistent with internal linkage,
2615 so there can be no error on that account.
2616 However defining the same name twice is no good. */
2617 if (DECL_INITIAL (olddecl
) != 0 && DECL_INITIAL (newdecl
) != 0
2618 /* However, defining once as extern inline and a second
2619 time in another way is ok. */
2620 && !(DECL_INLINE (olddecl
) && DECL_EXTERNAL (olddecl
)
2621 && !(DECL_INLINE (newdecl
) && DECL_EXTERNAL (newdecl
))))
2625 else if (current_binding_level
== global_binding_level
)
2627 /* Objects declared at top level: */
2628 /* If at least one is a reference, it's ok. */
2629 if (DECL_EXTERNAL (newdecl
) || DECL_EXTERNAL (olddecl
))
2631 /* Reject two definitions. */
2632 if (DECL_INITIAL (olddecl
) != 0 && DECL_INITIAL (newdecl
) != 0)
2634 /* Now we have two tentative defs, or one tentative and one real def. */
2635 /* Insist that the linkage match. */
2636 if (TREE_PUBLIC (olddecl
) != TREE_PUBLIC (newdecl
))
2640 else if (current_binding_level
->parm_flag
2641 && TREE_ASM_WRITTEN (olddecl
) && !TREE_ASM_WRITTEN (newdecl
))
2645 /* Newdecl has block scope. If olddecl has block scope also, then
2646 reject two definitions, and reject a definition together with an
2647 external reference. Otherwise, it is OK, because newdecl must
2648 be an extern reference to olddecl. */
2649 if (!(DECL_EXTERNAL (newdecl
) && DECL_EXTERNAL (olddecl
))
2650 && DECL_CONTEXT (newdecl
) == DECL_CONTEXT (olddecl
))
2656 /* Get the LABEL_DECL corresponding to identifier ID as a label.
2657 Create one if none exists so far for the current function.
2658 This function is called for both label definitions and label references. */
2664 register tree decl
= IDENTIFIER_LABEL_VALUE (id
);
2666 if (current_function_decl
== 0)
2668 error ("label %s referenced outside of any function",
2669 IDENTIFIER_POINTER (id
));
2673 /* Use a label already defined or ref'd with this name. */
2676 /* But not if it is inherited and wasn't declared to be inheritable. */
2677 if (DECL_CONTEXT (decl
) != current_function_decl
2678 && ! C_DECLARED_LABEL_FLAG (decl
))
2679 return shadow_label (id
);
2683 decl
= build_decl (LABEL_DECL
, id
, void_type_node
);
2685 /* Make sure every label has an rtx. */
2688 /* A label not explicitly declared must be local to where it's ref'd. */
2689 DECL_CONTEXT (decl
) = current_function_decl
;
2691 DECL_MODE (decl
) = VOIDmode
;
2693 /* Say where one reference is to the label,
2694 for the sake of the error if it is not defined. */
2695 DECL_SOURCE_LINE (decl
) = lineno
;
2696 DECL_SOURCE_FILE (decl
) = input_filename
;
2698 IDENTIFIER_LABEL_VALUE (id
) = decl
;
2700 named_labels
= tree_cons (NULL_TREE
, decl
, named_labels
);
2705 /* Make a label named NAME in the current function,
2706 shadowing silently any that may be inherited from containing functions
2707 or containing scopes.
2709 Note that valid use, if the label being shadowed
2710 comes from another scope in the same function,
2711 requires calling declare_nonlocal_label right away. */
2717 register tree decl
= IDENTIFIER_LABEL_VALUE (name
);
2723 /* Check to make sure that the label hasn't already been declared
2724 at this label scope */
2725 for (dup
= named_labels
; dup
; dup
= TREE_CHAIN (dup
))
2726 if (TREE_VALUE (dup
) == decl
)
2728 error ("duplicate label declaration `%s'",
2729 IDENTIFIER_POINTER (name
));
2730 error_with_decl (TREE_VALUE (dup
),
2731 "this is a previous declaration");
2732 /* Just use the previous declaration. */
2733 return lookup_label (name
);
2736 shadowed_labels
= tree_cons (NULL_TREE
, decl
, shadowed_labels
);
2737 IDENTIFIER_LABEL_VALUE (name
) = decl
= 0;
2740 return lookup_label (name
);
2743 /* Define a label, specifying the location in the source file.
2744 Return the LABEL_DECL node for the label, if the definition is valid.
2745 Otherwise return 0. */
2748 define_label (filename
, line
, name
)
2753 tree decl
= lookup_label (name
);
2755 /* If label with this name is known from an outer context, shadow it. */
2756 if (decl
!= 0 && DECL_CONTEXT (decl
) != current_function_decl
)
2758 shadowed_labels
= tree_cons (NULL_TREE
, decl
, shadowed_labels
);
2759 IDENTIFIER_LABEL_VALUE (name
) = 0;
2760 decl
= lookup_label (name
);
2763 if (DECL_INITIAL (decl
) != 0)
2765 error ("duplicate label `%s'", IDENTIFIER_POINTER (name
));
2770 /* Mark label as having been defined. */
2771 DECL_INITIAL (decl
) = error_mark_node
;
2772 /* Say where in the source. */
2773 DECL_SOURCE_FILE (decl
) = filename
;
2774 DECL_SOURCE_LINE (decl
) = line
;
2779 /* Return the list of declarations of the current level.
2780 Note that this list is in reverse order unless/until
2781 you nreverse it; and when you do nreverse it, you must
2782 store the result back using `storedecls' or you will lose. */
2787 return current_binding_level
->names
;
2790 /* Return the list of type-tags (for structs, etc) of the current level. */
2795 return current_binding_level
->tags
;
2798 /* Store the list of declarations of the current level.
2799 This is done for the parameter declarations of a function being defined,
2800 after they are modified in the light of any missing parameters. */
2806 current_binding_level
->names
= decls
;
2809 /* Similarly, store the list of tags of the current level. */
2815 current_binding_level
->tags
= tags
;
2818 /* Given NAME, an IDENTIFIER_NODE,
2819 return the structure (or union or enum) definition for that name.
2820 Searches binding levels from BINDING_LEVEL up to the global level.
2821 If THISLEVEL_ONLY is nonzero, searches only the specified context
2822 (but skips any tag-transparent contexts to find one that is
2823 meaningful for tags).
2824 CODE says which kind of type the caller wants;
2825 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2826 If the wrong kind of type is found, an error is reported. */
2829 lookup_tag (code
, name
, binding_level
, thislevel_only
)
2830 enum tree_code code
;
2831 struct binding_level
*binding_level
;
2835 register struct binding_level
*level
;
2837 for (level
= binding_level
; level
; level
= level
->level_chain
)
2840 for (tail
= level
->tags
; tail
; tail
= TREE_CHAIN (tail
))
2842 if (TREE_PURPOSE (tail
) == name
)
2844 if (TREE_CODE (TREE_VALUE (tail
)) != code
)
2846 /* Definition isn't the kind we were looking for. */
2847 pending_invalid_xref
= name
;
2848 pending_invalid_xref_file
= input_filename
;
2849 pending_invalid_xref_line
= lineno
;
2851 return TREE_VALUE (tail
);
2854 if (thislevel_only
&& ! level
->tag_transparent
)
2860 /* Print an error message now
2861 for a recent invalid struct, union or enum cross reference.
2862 We don't print them immediately because they are not invalid
2863 when used in the `struct foo;' construct for shadowing. */
2866 pending_xref_error ()
2868 if (pending_invalid_xref
!= 0)
2869 error_with_file_and_line (pending_invalid_xref_file
,
2870 pending_invalid_xref_line
,
2871 "`%s' defined as wrong kind of tag",
2872 IDENTIFIER_POINTER (pending_invalid_xref
));
2873 pending_invalid_xref
= 0;
2876 /* Given a type, find the tag that was defined for it and return the tag name.
2877 Otherwise return 0. */
2880 lookup_tag_reverse (type
)
2883 register struct binding_level
*level
;
2885 for (level
= current_binding_level
; level
; level
= level
->level_chain
)
2888 for (tail
= level
->tags
; tail
; tail
= TREE_CHAIN (tail
))
2890 if (TREE_VALUE (tail
) == type
)
2891 return TREE_PURPOSE (tail
);
2897 /* Look up NAME in the current binding level and its superiors
2898 in the namespace of variables, functions and typedefs.
2899 Return a ..._DECL node of some kind representing its definition,
2900 or return 0 if it is undefined. */
2907 if (current_binding_level
!= global_binding_level
2908 && IDENTIFIER_LOCAL_VALUE (name
))
2909 val
= IDENTIFIER_LOCAL_VALUE (name
);
2911 val
= IDENTIFIER_GLOBAL_VALUE (name
);
2915 /* Similar to `lookup_name' but look only at current binding level. */
2918 lookup_name_current_level (name
)
2923 if (current_binding_level
== global_binding_level
)
2924 return IDENTIFIER_GLOBAL_VALUE (name
);
2926 if (IDENTIFIER_LOCAL_VALUE (name
) == 0)
2929 for (t
= current_binding_level
->names
; t
; t
= TREE_CHAIN (t
))
2930 if (DECL_NAME (t
) == name
)
2936 /* Mark ARG for GC. */
2938 mark_binding_level (arg
)
2941 struct binding_level
*level
= *(struct binding_level
**) arg
;
2945 ggc_mark_tree (level
->names
);
2946 ggc_mark_tree (level
->tags
);
2947 ggc_mark_tree (level
->shadowed
);
2948 ggc_mark_tree (level
->blocks
);
2949 ggc_mark_tree (level
->this_block
);
2950 ggc_mark_tree (level
->parm_order
);
2951 level
= level
->level_chain
;
2955 /* Create the predefined scalar types of C,
2956 and some nodes representing standard constants (0, 1, (void *) 0).
2957 Initialize the global binding level.
2958 Make definitions for built-in primitive functions. */
2961 init_decl_processing ()
2963 register tree endlink
;
2964 tree ptr_ftype_void
, ptr_ftype_ptr
;
2965 int wchar_type_size
;
2966 tree array_domain_type
;
2968 current_function_decl
= NULL
;
2969 named_labels
= NULL
;
2970 current_binding_level
= NULL_BINDING_LEVEL
;
2971 free_binding_level
= NULL_BINDING_LEVEL
;
2972 pushlevel (0); /* make the binding_level structure for global names */
2973 global_binding_level
= current_binding_level
;
2975 /* Define `int' and `char' first so that dbx will output them first. */
2977 integer_type_node
= make_signed_type (INT_TYPE_SIZE
);
2978 pushdecl (build_decl (TYPE_DECL
, ridpointers
[(int) RID_INT
],
2979 integer_type_node
));
2981 /* Define `char', which is like either `signed char' or `unsigned char'
2982 but not the same as either. */
2986 ? make_signed_type (CHAR_TYPE_SIZE
)
2987 : make_unsigned_type (CHAR_TYPE_SIZE
));
2988 pushdecl (build_decl (TYPE_DECL
, get_identifier ("char"),
2991 long_integer_type_node
= make_signed_type (LONG_TYPE_SIZE
);
2992 pushdecl (build_decl (TYPE_DECL
, get_identifier ("long int"),
2993 long_integer_type_node
));
2995 unsigned_type_node
= make_unsigned_type (INT_TYPE_SIZE
);
2996 pushdecl (build_decl (TYPE_DECL
, get_identifier ("unsigned int"),
2997 unsigned_type_node
));
2999 long_unsigned_type_node
= make_unsigned_type (LONG_TYPE_SIZE
);
3000 pushdecl (build_decl (TYPE_DECL
, get_identifier ("long unsigned int"),
3001 long_unsigned_type_node
));
3003 long_long_integer_type_node
= make_signed_type (LONG_LONG_TYPE_SIZE
);
3004 pushdecl (build_decl (TYPE_DECL
, get_identifier ("long long int"),
3005 long_long_integer_type_node
));
3007 long_long_unsigned_type_node
= make_unsigned_type (LONG_LONG_TYPE_SIZE
);
3008 pushdecl (build_decl (TYPE_DECL
, get_identifier ("long long unsigned int"),
3009 long_long_unsigned_type_node
));
3011 short_integer_type_node
= make_signed_type (SHORT_TYPE_SIZE
);
3012 pushdecl (build_decl (TYPE_DECL
, get_identifier ("short int"),
3013 short_integer_type_node
));
3015 short_unsigned_type_node
= make_unsigned_type (SHORT_TYPE_SIZE
);
3016 pushdecl (build_decl (TYPE_DECL
, get_identifier ("short unsigned int"),
3017 short_unsigned_type_node
));
3019 /* `unsigned long' is the standard type for sizeof.
3020 Traditionally, use a signed type.
3021 Note that stddef.h uses `unsigned long',
3022 and this must agree, even if long and int are the same size. */
3024 (TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (SIZE_TYPE
))));
3025 if (flag_traditional
&& TREE_UNSIGNED (sizetype
))
3026 set_sizetype (signed_type (sizetype
));
3029 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (PTRDIFF_TYPE
)));
3031 error_mark_node
= make_node (ERROR_MARK
);
3032 TREE_TYPE (error_mark_node
) = error_mark_node
;
3034 /* Define both `signed char' and `unsigned char'. */
3035 signed_char_type_node
= make_signed_type (CHAR_TYPE_SIZE
);
3036 pushdecl (build_decl (TYPE_DECL
, get_identifier ("signed char"),
3037 signed_char_type_node
));
3039 unsigned_char_type_node
= make_unsigned_type (CHAR_TYPE_SIZE
);
3040 pushdecl (build_decl (TYPE_DECL
, get_identifier ("unsigned char"),
3041 unsigned_char_type_node
));
3043 /* Create the widest literal types. */
3044 widest_integer_literal_type_node
= make_signed_type (HOST_BITS_PER_WIDE_INT
* 2);
3045 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
,
3046 widest_integer_literal_type_node
));
3048 widest_unsigned_literal_type_node
= make_unsigned_type (HOST_BITS_PER_WIDE_INT
* 2);
3049 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
,
3050 widest_unsigned_literal_type_node
));
3052 /* Now all the integer mode types. */
3053 intQI_type_node
= make_signed_type (GET_MODE_BITSIZE (QImode
));
3054 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, intQI_type_node
));
3056 intHI_type_node
= make_signed_type (GET_MODE_BITSIZE (HImode
));
3057 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, intHI_type_node
));
3059 intSI_type_node
= make_signed_type (GET_MODE_BITSIZE (SImode
));
3060 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, intSI_type_node
));
3062 intDI_type_node
= make_signed_type (GET_MODE_BITSIZE (DImode
));
3063 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, intDI_type_node
));
3065 #if HOST_BITS_PER_WIDE_INT >= 64
3066 intTI_type_node
= make_signed_type (GET_MODE_BITSIZE (TImode
));
3067 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, intTI_type_node
));
3070 unsigned_intQI_type_node
= make_unsigned_type (GET_MODE_BITSIZE (QImode
));
3071 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, unsigned_intQI_type_node
));
3073 unsigned_intHI_type_node
= make_unsigned_type (GET_MODE_BITSIZE (HImode
));
3074 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, unsigned_intHI_type_node
));
3076 unsigned_intSI_type_node
= make_unsigned_type (GET_MODE_BITSIZE (SImode
));
3077 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, unsigned_intSI_type_node
));
3079 unsigned_intDI_type_node
= make_unsigned_type (GET_MODE_BITSIZE (DImode
));
3080 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, unsigned_intDI_type_node
));
3082 #if HOST_BITS_PER_WIDE_INT >= 64
3083 unsigned_intTI_type_node
= make_unsigned_type (GET_MODE_BITSIZE (TImode
));
3084 pushdecl (build_decl (TYPE_DECL
, NULL_TREE
, unsigned_intTI_type_node
));
3087 float_type_node
= make_node (REAL_TYPE
);
3088 TYPE_PRECISION (float_type_node
) = FLOAT_TYPE_SIZE
;
3089 pushdecl (build_decl (TYPE_DECL
, ridpointers
[(int) RID_FLOAT
],
3091 layout_type (float_type_node
);
3093 double_type_node
= make_node (REAL_TYPE
);
3094 if (flag_short_double
)
3095 TYPE_PRECISION (double_type_node
) = FLOAT_TYPE_SIZE
;
3097 TYPE_PRECISION (double_type_node
) = DOUBLE_TYPE_SIZE
;
3098 pushdecl (build_decl (TYPE_DECL
, ridpointers
[(int) RID_DOUBLE
],
3100 layout_type (double_type_node
);
3102 long_double_type_node
= make_node (REAL_TYPE
);
3103 TYPE_PRECISION (long_double_type_node
) = LONG_DOUBLE_TYPE_SIZE
;
3104 pushdecl (build_decl (TYPE_DECL
, get_identifier ("long double"),
3105 long_double_type_node
));
3106 layout_type (long_double_type_node
);
3108 complex_integer_type_node
= make_node (COMPLEX_TYPE
);
3109 pushdecl (build_decl (TYPE_DECL
, get_identifier ("complex int"),
3110 complex_integer_type_node
));
3111 TREE_TYPE (complex_integer_type_node
) = integer_type_node
;
3112 layout_type (complex_integer_type_node
);
3114 complex_float_type_node
= make_node (COMPLEX_TYPE
);
3115 pushdecl (build_decl (TYPE_DECL
, get_identifier ("complex float"),
3116 complex_float_type_node
));
3117 TREE_TYPE (complex_float_type_node
) = float_type_node
;
3118 layout_type (complex_float_type_node
);
3120 complex_double_type_node
= make_node (COMPLEX_TYPE
);
3121 pushdecl (build_decl (TYPE_DECL
, get_identifier ("complex double"),
3122 complex_double_type_node
));
3123 TREE_TYPE (complex_double_type_node
) = double_type_node
;
3124 layout_type (complex_double_type_node
);
3126 complex_long_double_type_node
= make_node (COMPLEX_TYPE
);
3127 pushdecl (build_decl (TYPE_DECL
, get_identifier ("complex long double"),
3128 complex_long_double_type_node
));
3129 TREE_TYPE (complex_long_double_type_node
) = long_double_type_node
;
3130 layout_type (complex_long_double_type_node
);
3133 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (WCHAR_TYPE
)));
3134 wchar_type_size
= TYPE_PRECISION (wchar_type_node
);
3135 signed_wchar_type_node
= signed_type (wchar_type_node
);
3136 unsigned_wchar_type_node
= unsigned_type (wchar_type_node
);
3138 integer_zero_node
= build_int_2 (0, 0);
3139 TREE_TYPE (integer_zero_node
) = integer_type_node
;
3140 integer_one_node
= build_int_2 (1, 0);
3141 TREE_TYPE (integer_one_node
) = integer_type_node
;
3143 boolean_type_node
= integer_type_node
;
3144 boolean_true_node
= integer_one_node
;
3145 boolean_false_node
= integer_zero_node
;
3147 size_zero_node
= build_int_2 (0, 0);
3148 TREE_TYPE (size_zero_node
) = sizetype
;
3149 size_one_node
= build_int_2 (1, 0);
3150 TREE_TYPE (size_one_node
) = sizetype
;
3152 void_type_node
= make_node (VOID_TYPE
);
3153 pushdecl (build_decl (TYPE_DECL
,
3154 ridpointers
[(int) RID_VOID
], void_type_node
));
3155 layout_type (void_type_node
); /* Uses integer_zero_node */
3156 /* We are not going to have real types in C with less than byte alignment,
3157 so we might as well not have any types that claim to have it. */
3158 TYPE_ALIGN (void_type_node
) = BITS_PER_UNIT
;
3160 null_pointer_node
= build_int_2 (0, 0);
3161 TREE_TYPE (null_pointer_node
) = build_pointer_type (void_type_node
);
3162 layout_type (TREE_TYPE (null_pointer_node
));
3164 string_type_node
= build_pointer_type (char_type_node
);
3165 const_string_type_node
3166 = build_pointer_type (build_type_variant (char_type_node
, 1, 0));
3168 /* Make a type to be the domain of a few array types
3169 whose domains don't really matter.
3170 200 is small enough that it always fits in size_t
3171 and large enough that it can hold most function names for the
3172 initializations of __FUNCTION__ and __PRETTY_FUNCTION__. */
3173 array_domain_type
= build_index_type (build_int_2 (200, 0));
3175 /* make a type for arrays of characters.
3176 With luck nothing will ever really depend on the length of this
3178 char_array_type_node
3179 = build_array_type (char_type_node
, array_domain_type
);
3180 /* Likewise for arrays of ints. */
3182 = build_array_type (integer_type_node
, array_domain_type
);
3183 /* This is for wide string constants. */
3184 wchar_array_type_node
3185 = build_array_type (wchar_type_node
, array_domain_type
);
3187 void_list_node
= tree_cons (NULL_TREE
, void_type_node
, NULL_TREE
);
3189 default_function_type
3190 = build_function_type (integer_type_node
, NULL_TREE
);
3192 ptr_type_node
= build_pointer_type (void_type_node
);
3194 = build_pointer_type (build_type_variant (void_type_node
, 1, 0));
3196 c_common_nodes_and_builtins (0, flag_no_builtin
, flag_no_nonansi_builtin
);
3198 endlink
= void_list_node
;
3199 ptr_ftype_void
= build_function_type (ptr_type_node
, endlink
);
3201 = build_function_type (ptr_type_node
,
3202 tree_cons (NULL_TREE
, ptr_type_node
, endlink
));
3204 builtin_function ("__builtin_aggregate_incoming_address",
3205 build_function_type (ptr_type_node
, NULL_TREE
),
3206 BUILT_IN_AGGREGATE_INCOMING_ADDRESS
, NULL_PTR
);
3208 /* Hooks for the DWARF 2 __throw routine. */
3209 builtin_function ("__builtin_unwind_init",
3210 build_function_type (void_type_node
, endlink
),
3211 BUILT_IN_UNWIND_INIT
, NULL_PTR
);
3212 builtin_function ("__builtin_dwarf_cfa", ptr_ftype_void
,
3213 BUILT_IN_DWARF_CFA
, NULL_PTR
);
3214 builtin_function ("__builtin_dwarf_fp_regnum",
3215 build_function_type (unsigned_type_node
, endlink
),
3216 BUILT_IN_DWARF_FP_REGNUM
, NULL_PTR
);
3217 builtin_function ("__builtin_dwarf_reg_size", int_ftype_int
,
3218 BUILT_IN_DWARF_REG_SIZE
, NULL_PTR
);
3219 builtin_function ("__builtin_frob_return_addr", ptr_ftype_ptr
,
3220 BUILT_IN_FROB_RETURN_ADDR
, NULL_PTR
);
3221 builtin_function ("__builtin_extract_return_addr", ptr_ftype_ptr
,
3222 BUILT_IN_EXTRACT_RETURN_ADDR
, NULL_PTR
);
3224 ("__builtin_eh_return",
3225 build_function_type (void_type_node
,
3226 tree_cons (NULL_TREE
, ptr_type_node
,
3227 tree_cons (NULL_TREE
,
3228 type_for_mode (ptr_mode
, 0),
3229 tree_cons (NULL_TREE
,
3232 BUILT_IN_EH_RETURN
, NULL_PTR
);
3234 pedantic_lvalues
= pedantic
;
3236 /* Create the global bindings for __FUNCTION__ and __PRETTY_FUNCTION__. */
3237 declare_function_name ();
3239 start_identifier_warnings ();
3241 /* Prepare to check format strings against argument lists. */
3242 init_function_format_info ();
3246 incomplete_decl_finalize_hook
= finish_incomplete_decl
;
3248 lang_get_alias_set
= c_get_alias_set
;
3250 /* Record our roots. */
3252 ggc_add_tree_root (c_global_trees
, CTI_MAX
);
3253 ggc_add_tree_root (¤t_function_decl
, 1);
3254 ggc_add_tree_root (&error_mark_node
, 1);
3255 ggc_add_tree_root (&ptr_type_node
, 1);
3256 ggc_add_tree_root (&va_list_type_node
, 1);
3257 ggc_add_tree_root (&void_type_node
, 1);
3258 ggc_add_tree_root (&char_type_node
, 1);
3259 ggc_add_tree_root (&integer_type_node
, 1);
3260 ggc_add_tree_root (&unsigned_type_node
, 1);
3261 ggc_add_tree_root (&integer_one_node
, 1);
3262 ggc_add_tree_root (&integer_zero_node
, 1);
3263 ggc_add_tree_root (&named_labels
, 1);
3264 ggc_add_tree_root (&null_pointer_node
, 1);
3265 ggc_add_tree_root (&size_one_node
, 1);
3266 ggc_add_tree_root (&size_zero_node
, 1);
3267 ggc_add_tree_root (&shadowed_labels
, 1);
3268 ggc_add_root (¤t_binding_level
, 1, sizeof current_binding_level
,
3269 mark_binding_level
);
3270 ggc_add_root (&label_level_chain
, 1, sizeof label_level_chain
,
3271 mark_binding_level
);
3272 ggc_add_tree_root (&static_ctors
, 1);
3273 ggc_add_tree_root (&static_dtors
, 1);
3276 /* Return a definition for a builtin function named NAME and whose data type
3277 is TYPE. TYPE should be a function type with argument types.
3278 FUNCTION_CODE tells later passes how to compile calls to this function.
3279 See tree.h for its possible values.
3281 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3282 the name to be called if we can't opencode the function. */
3285 builtin_function (name
, type
, function_code
, library_name
)
3288 enum built_in_function function_code
;
3289 const char *library_name
;
3291 tree decl
= build_decl (FUNCTION_DECL
, get_identifier (name
), type
);
3292 DECL_EXTERNAL (decl
) = 1;
3293 TREE_PUBLIC (decl
) = 1;
3294 /* If -traditional, permit redefining a builtin function any way you like.
3295 (Though really, if the program redefines these functions,
3296 it probably won't work right unless compiled with -fno-builtin.) */
3297 if (flag_traditional
&& name
[0] != '_')
3298 DECL_BUILT_IN_NONANSI (decl
) = 1;
3300 DECL_ASSEMBLER_NAME (decl
) = get_identifier (library_name
);
3301 make_decl_rtl (decl
, NULL_PTR
, 1);
3303 if (function_code
!= NOT_BUILT_IN
)
3305 DECL_BUILT_IN (decl
) = 1;
3306 DECL_FUNCTION_CODE (decl
) = function_code
;
3308 /* Warn if a function in the namespace for users
3309 is used without an occasion to consider it declared. */
3310 if (name
[0] != '_' || name
[1] != '_')
3311 C_DECL_ANTICIPATED (decl
) = 1;
3316 /* Called when a declaration is seen that contains no names to declare.
3317 If its type is a reference to a structure, union or enum inherited
3318 from a containing scope, shadow that tag name for the current scope
3319 with a forward reference.
3320 If its type defines a new named structure or union
3321 or defines an enum, it is valid but we need not do anything here.
3322 Otherwise, it is an error. */
3325 shadow_tag (declspecs
)
3328 shadow_tag_warned (declspecs
, 0);
3332 shadow_tag_warned (declspecs
, warned
)
3335 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
3342 pending_invalid_xref
= 0;
3344 /* Remove the attributes from declspecs, since they will confuse the
3346 split_specs_attrs (declspecs
, &specs
, &attrs
);
3348 for (link
= specs
; link
; link
= TREE_CHAIN (link
))
3350 register tree value
= TREE_VALUE (link
);
3351 register enum tree_code code
= TREE_CODE (value
);
3353 if (code
== RECORD_TYPE
|| code
== UNION_TYPE
|| code
== ENUMERAL_TYPE
)
3354 /* Used to test also that TYPE_SIZE (value) != 0.
3355 That caused warning for `struct foo;' at top level in the file. */
3357 register tree name
= lookup_tag_reverse (value
);
3364 if (warned
!= 1 && code
!= ENUMERAL_TYPE
)
3365 /* Empty unnamed enum OK */
3367 pedwarn ("unnamed struct/union that defines no instances");
3373 t
= lookup_tag (code
, name
, current_binding_level
, 1);
3377 t
= make_node (code
);
3384 if (!warned
&& ! in_system_header
)
3386 warning ("useless keyword or type name in empty declaration");
3393 error ("two types specified in one empty declaration");
3398 pedwarn ("empty declaration");
3402 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3405 groktypename (typename
)
3408 if (TREE_CODE (typename
) != TREE_LIST
)
3410 return grokdeclarator (TREE_VALUE (typename
),
3411 TREE_PURPOSE (typename
),
3415 /* Return a PARM_DECL node for a given pair of specs and declarator. */
3418 groktypename_in_parm_context (typename
)
3421 if (TREE_CODE (typename
) != TREE_LIST
)
3423 return grokdeclarator (TREE_VALUE (typename
),
3424 TREE_PURPOSE (typename
),
3428 /* Decode a declarator in an ordinary declaration or data definition.
3429 This is called as soon as the type information and variable name
3430 have been parsed, before parsing the initializer if any.
3431 Here we create the ..._DECL node, fill in its type,
3432 and put it on the list of decls for the current context.
3433 The ..._DECL node is returned as the value.
3435 Exception: for arrays where the length is not specified,
3436 the type is left null, to be filled in by `finish_decl'.
3438 Function definitions do not come here; they go to start_function
3439 instead. However, external and forward declarations of functions
3440 do go through here. Structure field declarations are done by
3441 grokfield and not through here. */
3443 /* Set this to zero to debug not using the temporary obstack
3444 to parse initializers. */
3445 int debug_temp_inits
= 1;
3448 start_decl (declarator
, declspecs
, initialized
, attributes
, prefix_attributes
)
3449 tree declarator
, declspecs
;
3451 tree attributes
, prefix_attributes
;
3453 register tree decl
= grokdeclarator (declarator
, declspecs
,
3454 NORMAL
, initialized
);
3456 int init_written
= initialized
;
3458 /* The corresponding pop_obstacks is in finish_decl. */
3459 push_obstacks_nochange ();
3461 if (warn_main
> 0 && TREE_CODE (decl
) != FUNCTION_DECL
3462 && !strcmp (IDENTIFIER_POINTER (DECL_NAME (decl
)), "main"))
3463 warning_with_decl (decl
, "`%s' is usually a function");
3466 /* Is it valid for this decl to have an initializer at all?
3467 If not, set INITIALIZED to zero, which will indirectly
3468 tell `finish_decl' to ignore the initializer once it is parsed. */
3469 switch (TREE_CODE (decl
))
3472 /* typedef foo = bar means give foo the same type as bar.
3473 We haven't parsed bar yet, so `finish_decl' will fix that up.
3474 Any other case of an initialization in a TYPE_DECL is an error. */
3475 if (pedantic
|| list_length (declspecs
) > 1)
3477 error ("typedef `%s' is initialized",
3478 IDENTIFIER_POINTER (DECL_NAME (decl
)));
3484 error ("function `%s' is initialized like a variable",
3485 IDENTIFIER_POINTER (DECL_NAME (decl
)));
3490 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3491 error ("parameter `%s' is initialized",
3492 IDENTIFIER_POINTER (DECL_NAME (decl
)));
3497 /* Don't allow initializations for incomplete types
3498 except for arrays which might be completed by the initialization. */
3499 if (TYPE_SIZE (TREE_TYPE (decl
)) != 0)
3501 /* A complete type is ok if size is fixed. */
3503 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl
))) != INTEGER_CST
3504 || C_DECL_VARIABLE_SIZE (decl
))
3506 error ("variable-sized object may not be initialized");
3510 else if (TREE_CODE (TREE_TYPE (decl
)) != ARRAY_TYPE
)
3512 error ("variable `%s' has initializer but incomplete type",
3513 IDENTIFIER_POINTER (DECL_NAME (decl
)));
3516 else if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl
))) == 0)
3518 error ("elements of array `%s' have incomplete type",
3519 IDENTIFIER_POINTER (DECL_NAME (decl
)));
3526 #if 0 /* Seems redundant with grokdeclarator. */
3527 if (current_binding_level
!= global_binding_level
3528 && DECL_EXTERNAL (decl
)
3529 && TREE_CODE (decl
) != FUNCTION_DECL
)
3530 warning ("declaration of `%s' has `extern' and is initialized",
3531 IDENTIFIER_POINTER (DECL_NAME (decl
)));
3533 DECL_EXTERNAL (decl
) = 0;
3534 if (current_binding_level
== global_binding_level
)
3535 TREE_STATIC (decl
) = 1;
3537 /* Tell `pushdecl' this is an initialized decl
3538 even though we don't yet have the initializer expression.
3539 Also tell `finish_decl' it may store the real initializer. */
3540 DECL_INITIAL (decl
) = error_mark_node
;
3543 /* If this is a function declaration, write a record describing it to the
3544 prototypes file (if requested). */
3546 if (TREE_CODE (decl
) == FUNCTION_DECL
)
3547 gen_aux_info_record (decl
, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl
)) != 0);
3549 /* ANSI specifies that a tentative definition which is not merged with
3550 a non-tentative definition behaves exactly like a definition with an
3551 initializer equal to zero. (Section 3.7.2)
3552 -fno-common gives strict ANSI behavior. Usually you don't want it.
3553 This matters only for variables with external linkage. */
3554 if (! flag_no_common
|| ! TREE_PUBLIC (decl
))
3555 DECL_COMMON (decl
) = 1;
3557 #ifdef SET_DEFAULT_DECL_ATTRIBUTES
3558 SET_DEFAULT_DECL_ATTRIBUTES (decl
, attributes
);
3561 /* Set attributes here so if duplicate decl, will have proper attributes. */
3562 decl_attributes (decl
, attributes
, prefix_attributes
);
3564 /* Add this decl to the current binding level.
3565 TEM may equal DECL or it may be a previous decl of the same name. */
3566 tem
= pushdecl (decl
);
3568 /* For a local variable, define the RTL now. */
3569 if (current_binding_level
!= global_binding_level
3570 /* But not if this is a duplicate decl
3571 and we preserved the rtl from the previous one
3572 (which may or may not happen). */
3573 && DECL_RTL (tem
) == 0)
3575 if (TYPE_SIZE (TREE_TYPE (tem
)) != 0)
3577 else if (TREE_CODE (TREE_TYPE (tem
)) == ARRAY_TYPE
3578 && DECL_INITIAL (tem
) != 0)
3584 /* When parsing and digesting the initializer,
3585 use temporary storage. Do this even if we will ignore the value. */
3586 if (current_binding_level
== global_binding_level
&& debug_temp_inits
)
3587 temporary_allocation ();
3593 /* Finish processing of a declaration;
3594 install its initial value.
3595 If the length of an array type is not known before,
3596 it must be determined now, from the initial value, or it is an error. */
3599 finish_decl (decl
, init
, asmspec_tree
)
3603 register tree type
= TREE_TYPE (decl
);
3604 int was_incomplete
= (DECL_SIZE (decl
) == 0);
3605 int temporary
= allocation_temporary_p ();
3608 /* If a name was specified, get the string. */
3610 asmspec
= TREE_STRING_POINTER (asmspec_tree
);
3612 /* If `start_decl' didn't like having an initialization, ignore it now. */
3614 if (init
!= 0 && DECL_INITIAL (decl
) == 0)
3616 /* Don't crash if parm is initialized. */
3617 if (TREE_CODE (decl
) == PARM_DECL
)
3620 if (ITERATOR_P (decl
))
3623 error_with_decl (decl
, "iterator has no initial value");
3625 init
= save_expr (init
);
3630 if (TREE_CODE (decl
) != TYPE_DECL
)
3631 store_init_value (decl
, init
);
3634 /* typedef foo = bar; store the type of bar as the type of foo. */
3635 TREE_TYPE (decl
) = TREE_TYPE (init
);
3636 DECL_INITIAL (decl
) = init
= 0;
3640 /* Pop back to the obstack that is current for this binding level.
3641 This is because MAXINDEX, rtl, etc. to be made below
3642 must go in the permanent obstack. But don't discard the
3643 temporary data yet. */
3645 #if 0 /* pop_obstacks was near the end; this is what was here. */
3646 if (current_binding_level
== global_binding_level
&& temporary
)
3647 end_temporary_allocation ();
3650 /* Deduce size of array from initialization, if not already known */
3652 if (TREE_CODE (type
) == ARRAY_TYPE
3653 && TYPE_DOMAIN (type
) == 0
3654 && TREE_CODE (decl
) != TYPE_DECL
)
3657 = (TREE_STATIC (decl
)
3658 /* Even if pedantic, an external linkage array
3659 may have incomplete type at first. */
3660 ? pedantic
&& !TREE_PUBLIC (decl
)
3661 : !DECL_EXTERNAL (decl
));
3663 = complete_array_type (type
, DECL_INITIAL (decl
), do_default
);
3665 /* Get the completed type made by complete_array_type. */
3666 type
= TREE_TYPE (decl
);
3669 error_with_decl (decl
, "initializer fails to determine size of `%s'");
3674 error_with_decl (decl
, "array size missing in `%s'");
3675 /* If a `static' var's size isn't known,
3676 make it extern as well as static, so it does not get
3678 If it is not `static', then do not mark extern;
3679 finish_incomplete_decl will give it a default size
3680 and it will get allocated. */
3681 else if (!pedantic
&& TREE_STATIC (decl
) && ! TREE_PUBLIC (decl
))
3682 DECL_EXTERNAL (decl
) = 1;
3685 /* TYPE_MAX_VALUE is always one less than the number of elements
3686 in the array, because we start counting at zero. Therefore,
3687 warn only if the value is less than zero. */
3688 if (pedantic
&& TYPE_DOMAIN (type
) != 0
3689 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type
))) < 0)
3690 error_with_decl (decl
, "zero or negative size array `%s'");
3692 layout_decl (decl
, 0);
3695 if (TREE_CODE (decl
) == VAR_DECL
)
3697 if (DECL_SIZE (decl
) == 0
3698 && TYPE_SIZE (TREE_TYPE (decl
)) != 0)
3699 layout_decl (decl
, 0);
3701 if (DECL_SIZE (decl
) == 0
3702 && (TREE_STATIC (decl
)
3704 /* A static variable with an incomplete type
3705 is an error if it is initialized.
3706 Also if it is not file scope.
3707 Otherwise, let it through, but if it is not `extern'
3708 then it may cause an error message later. */
3709 /* A duplicate_decls call could have changed an extern
3710 declaration into a file scope one. This can be detected
3711 by TREE_ASM_WRITTEN being set. */
3712 (DECL_INITIAL (decl
) != 0
3713 || (DECL_CONTEXT (decl
) != 0 && ! TREE_ASM_WRITTEN (decl
)))
3715 /* An automatic variable with an incomplete type
3717 !DECL_EXTERNAL (decl
)))
3719 error_with_decl (decl
, "storage size of `%s' isn't known");
3720 TREE_TYPE (decl
) = error_mark_node
;
3723 if ((DECL_EXTERNAL (decl
) || TREE_STATIC (decl
))
3724 && DECL_SIZE (decl
) != 0)
3726 if (TREE_CODE (DECL_SIZE (decl
)) == INTEGER_CST
)
3727 constant_expression_warning (DECL_SIZE (decl
));
3729 error_with_decl (decl
, "storage size of `%s' isn't constant");
3732 if (TREE_USED (type
))
3733 TREE_USED (decl
) = 1;
3736 /* If this is a function and an assembler name is specified, it isn't
3737 builtin any more. Also reset DECL_RTL so we can give it its new
3739 if (TREE_CODE (decl
) == FUNCTION_DECL
&& asmspec
)
3741 DECL_BUILT_IN (decl
) = 0;
3742 DECL_RTL (decl
) = 0;
3745 /* Output the assembler code and/or RTL code for variables and functions,
3746 unless the type is an undefined structure or union.
3747 If not, it will get done when the type is completed. */
3749 if (TREE_CODE (decl
) == VAR_DECL
|| TREE_CODE (decl
) == FUNCTION_DECL
)
3751 if ((flag_traditional
|| TREE_PERMANENT (decl
))
3752 && allocation_temporary_p ())
3754 push_obstacks_nochange ();
3755 end_temporary_allocation ();
3756 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3757 maybe_objc_check_decl (decl
);
3758 rest_of_decl_compilation (decl
, asmspec
,
3759 (DECL_CONTEXT (decl
) == 0
3760 || TREE_ASM_WRITTEN (decl
)),
3766 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3767 maybe_objc_check_decl (decl
);
3768 rest_of_decl_compilation (decl
, asmspec
, DECL_CONTEXT (decl
) == 0,
3771 if (DECL_CONTEXT (decl
) != 0)
3773 /* Recompute the RTL of a local array now
3774 if it used to be an incomplete type. */
3776 && ! TREE_STATIC (decl
) && ! DECL_EXTERNAL (decl
))
3778 /* If we used it already as memory, it must stay in memory. */
3779 TREE_ADDRESSABLE (decl
) = TREE_USED (decl
);
3780 /* If it's still incomplete now, no init will save it. */
3781 if (DECL_SIZE (decl
) == 0)
3782 DECL_INITIAL (decl
) = 0;
3785 /* Compute and store the initial value. */
3786 if (TREE_CODE (decl
) != FUNCTION_DECL
)
3787 expand_decl_init (decl
);
3791 if (TREE_CODE (decl
) == TYPE_DECL
)
3793 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3794 maybe_objc_check_decl (decl
);
3795 rest_of_decl_compilation (decl
, NULL_PTR
, DECL_CONTEXT (decl
) == 0,
3799 /* ??? After 2.3, test (init != 0) instead of TREE_CODE. */
3800 /* This test used to include TREE_PERMANENT, however, we have the same
3801 problem with initializers at the function level. Such initializers get
3802 saved until the end of the function on the momentary_obstack. */
3803 if (!(TREE_CODE (decl
) == FUNCTION_DECL
&& DECL_INLINE (decl
))
3805 /* DECL_INITIAL is not defined in PARM_DECLs, since it shares
3806 space with DECL_ARG_TYPE. */
3807 && TREE_CODE (decl
) != PARM_DECL
)
3809 /* We need to remember that this array HAD an initialization,
3810 but discard the actual temporary nodes,
3811 since we can't have a permanent node keep pointing to them. */
3812 /* We make an exception for inline functions, since it's
3813 normal for a local extern redeclaration of an inline function
3814 to have a copy of the top-level decl's DECL_INLINE. */
3815 if (DECL_INITIAL (decl
) != 0 && DECL_INITIAL (decl
) != error_mark_node
)
3817 /* If this is a const variable, then preserve the
3818 initializer instead of discarding it so that we can optimize
3819 references to it. */
3820 /* This test used to include TREE_STATIC, but this won't be set
3821 for function level initializers. */
3822 if (TREE_READONLY (decl
) || ITERATOR_P (decl
))
3824 preserve_initializer ();
3825 /* Hack? Set the permanent bit for something that is permanent,
3826 but not on the permanent obstack, so as to convince
3827 output_constant_def to make its rtl on the permanent
3829 TREE_PERMANENT (DECL_INITIAL (decl
)) = 1;
3831 /* The initializer and DECL must have the same (or equivalent
3832 types), but if the initializer is a STRING_CST, its type
3833 might not be on the right obstack, so copy the type
3835 TREE_TYPE (DECL_INITIAL (decl
)) = type
;
3838 DECL_INITIAL (decl
) = error_mark_node
;
3842 /* If requested, warn about definitions of large data objects. */
3844 if (warn_larger_than
3845 && (TREE_CODE (decl
) == VAR_DECL
|| TREE_CODE (decl
) == PARM_DECL
)
3846 && !DECL_EXTERNAL (decl
))
3848 register tree decl_size
= DECL_SIZE (decl
);
3850 if (decl_size
&& TREE_CODE (decl_size
) == INTEGER_CST
)
3852 unsigned units
= TREE_INT_CST_LOW(decl_size
) / BITS_PER_UNIT
;
3854 if (units
> larger_than_size
)
3855 warning_with_decl (decl
, "size of `%s' is %u bytes", units
);
3860 /* Resume permanent allocation, if not within a function. */
3861 /* The corresponding push_obstacks_nochange is in start_decl,
3862 and in push_parm_decl and in grokfield. */
3866 /* If we have gone back from temporary to permanent allocation,
3867 actually free the temporary space that we no longer need. */
3868 if (temporary
&& !allocation_temporary_p ())
3869 permanent_allocation (0);
3871 /* At the end of a declaration, throw away any variable type sizes
3872 of types defined inside that declaration. There is no use
3873 computing them in the following function definition. */
3874 if (current_binding_level
== global_binding_level
)
3875 get_pending_sizes ();
3878 /* If DECL has a cleanup, build and return that cleanup here.
3879 This is a callback called by expand_expr. */
3882 maybe_build_cleanup (decl
)
3883 tree decl ATTRIBUTE_UNUSED
;
3885 /* There are no cleanups in C. */
3889 /* Given a parsed parameter declaration,
3890 decode it into a PARM_DECL and push that on the current binding level.
3891 Also, for the sake of forward parm decls,
3892 record the given order of parms in `parm_order'. */
3895 push_parm_decl (parm
)
3899 int old_immediate_size_expand
= immediate_size_expand
;
3900 /* Don't try computing parm sizes now -- wait till fn is called. */
3901 immediate_size_expand
= 0;
3903 /* The corresponding pop_obstacks is in finish_decl. */
3904 push_obstacks_nochange ();
3906 decl
= grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm
)),
3907 TREE_PURPOSE (TREE_PURPOSE (parm
)), PARM
, 0);
3908 decl_attributes (decl
, TREE_VALUE (TREE_VALUE (parm
)),
3909 TREE_PURPOSE (TREE_VALUE (parm
)));
3912 if (DECL_NAME (decl
))
3915 olddecl
= lookup_name (DECL_NAME (decl
));
3916 if (pedantic
&& olddecl
!= 0 && TREE_CODE (olddecl
) == TYPE_DECL
)
3917 pedwarn_with_decl (decl
, "ANSI C forbids parameter `%s' shadowing typedef");
3921 decl
= pushdecl (decl
);
3923 immediate_size_expand
= old_immediate_size_expand
;
3925 current_binding_level
->parm_order
3926 = tree_cons (NULL_TREE
, decl
, current_binding_level
->parm_order
);
3928 /* Add this decl to the current binding level. */
3929 finish_decl (decl
, NULL_TREE
, NULL_TREE
);
3932 /* Clear the given order of parms in `parm_order'.
3933 Used at start of parm list,
3934 and also at semicolon terminating forward decls. */
3939 current_binding_level
->parm_order
= NULL_TREE
;
3942 /* Make TYPE a complete type based on INITIAL_VALUE.
3943 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3944 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3947 complete_array_type (type
, initial_value
, do_default
)
3952 register tree maxindex
= NULL_TREE
;
3957 /* Note MAXINDEX is really the maximum index,
3958 one less than the size. */
3959 if (TREE_CODE (initial_value
) == STRING_CST
)
3962 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value
)));
3963 maxindex
= build_int_2 ((TREE_STRING_LENGTH (initial_value
)
3966 else if (TREE_CODE (initial_value
) == CONSTRUCTOR
)
3968 tree elts
= CONSTRUCTOR_ELTS (initial_value
);
3969 maxindex
= size_binop (MINUS_EXPR
, integer_zero_node
, size_one_node
);
3970 for (; elts
; elts
= TREE_CHAIN (elts
))
3972 if (TREE_PURPOSE (elts
))
3973 maxindex
= TREE_PURPOSE (elts
);
3975 maxindex
= size_binop (PLUS_EXPR
, maxindex
, size_one_node
);
3977 maxindex
= copy_node (maxindex
);
3981 /* Make an error message unless that happened already. */
3982 if (initial_value
!= error_mark_node
)
3985 /* Prevent further error messages. */
3986 maxindex
= build_int_2 (0, 0);
3993 maxindex
= build_int_2 (0, 0);
3999 TYPE_DOMAIN (type
) = build_index_type (maxindex
);
4000 if (!TREE_TYPE (maxindex
))
4001 TREE_TYPE (maxindex
) = TYPE_DOMAIN (type
);
4004 /* Lay out the type now that we can get the real answer. */
4011 /* Given declspecs and a declarator,
4012 determine the name and type of the object declared
4013 and construct a ..._DECL node for it.
4014 (In one case we can return a ..._TYPE node instead.
4015 For invalid input we sometimes return 0.)
4017 DECLSPECS is a chain of tree_list nodes whose value fields
4018 are the storage classes and type specifiers.
4020 DECL_CONTEXT says which syntactic context this declaration is in:
4021 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
4022 FUNCDEF for a function definition. Like NORMAL but a few different
4023 error messages in each case. Return value may be zero meaning
4024 this definition is too screwy to try to parse.
4025 PARM for a parameter declaration (either within a function prototype
4026 or before a function body). Make a PARM_DECL, or return void_type_node.
4027 TYPENAME if for a typename (in a cast or sizeof).
4028 Don't make a DECL node; just return the ..._TYPE node.
4029 FIELD for a struct or union field; make a FIELD_DECL.
4030 BITFIELD for a field with specified width.
4031 INITIALIZED is 1 if the decl has an initializer.
4033 In the TYPENAME case, DECLARATOR is really an absolute declarator.
4034 It may also be so in the PARM case, for a prototype where the
4035 argument type is specified but not the name.
4037 This function is where the complicated C meanings of `static'
4038 and `extern' are interpreted. */
4041 grokdeclarator (declarator
, declspecs
, decl_context
, initialized
)
4044 enum decl_context decl_context
;
4049 tree type
= NULL_TREE
;
4054 int type_quals
= TYPE_UNQUALIFIED
;
4056 int explicit_int
= 0;
4057 int explicit_char
= 0;
4058 int defaulted_int
= 0;
4059 tree typedef_decl
= 0;
4061 tree typedef_type
= 0;
4062 int funcdef_flag
= 0;
4063 enum tree_code innermost_code
= ERROR_MARK
;
4065 int size_varies
= 0;
4066 tree decl_machine_attr
= NULL_TREE
;
4068 if (decl_context
== BITFIELD
)
4069 bitfield
= 1, decl_context
= FIELD
;
4071 if (decl_context
== FUNCDEF
)
4072 funcdef_flag
= 1, decl_context
= NORMAL
;
4074 push_obstacks_nochange ();
4076 if (flag_traditional
&& allocation_temporary_p ())
4077 end_temporary_allocation ();
4079 /* Look inside a declarator for the name being declared
4080 and get it as a string, for an error message. */
4082 register tree decl
= declarator
;
4086 switch (TREE_CODE (decl
))
4091 innermost_code
= TREE_CODE (decl
);
4092 decl
= TREE_OPERAND (decl
, 0);
4095 case IDENTIFIER_NODE
:
4096 name
= IDENTIFIER_POINTER (decl
);
4107 /* A function definition's declarator must have the form of
4108 a function declarator. */
4110 if (funcdef_flag
&& innermost_code
!= CALL_EXPR
)
4113 /* Anything declared one level down from the top level
4114 must be one of the parameters of a function
4115 (because the body is at least two levels down). */
4117 /* If this looks like a function definition, make it one,
4118 even if it occurs where parms are expected.
4119 Then store_parm_decls will reject it and not use it as a parm. */
4120 if (decl_context
== NORMAL
&& !funcdef_flag
4121 && current_binding_level
->parm_flag
)
4122 decl_context
= PARM
;
4124 /* Look through the decl specs and record which ones appear.
4125 Some typespecs are defined as built-in typenames.
4126 Others, the ones that are modifiers of other types,
4127 are represented by bits in SPECBITS: set the bits for
4128 the modifiers that appear. Storage class keywords are also in SPECBITS.
4130 If there is a typedef name or a type, store the type in TYPE.
4131 This includes builtin typedefs such as `int'.
4133 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
4134 and did not come from a user typedef.
4136 Set LONGLONG if `long' is mentioned twice. */
4138 for (spec
= declspecs
; spec
; spec
= TREE_CHAIN (spec
))
4141 register tree id
= TREE_VALUE (spec
);
4143 if (id
== ridpointers
[(int) RID_INT
])
4145 if (id
== ridpointers
[(int) RID_CHAR
])
4148 if (TREE_CODE (id
) == IDENTIFIER_NODE
)
4149 for (i
= (int) RID_FIRST_MODIFIER
; i
< (int) RID_MAX
; i
++)
4151 if (ridpointers
[i
] == id
)
4153 if (i
== (int) RID_LONG
&& specbits
& (1<<i
))
4156 error ("`long long long' is too long for GCC");
4159 if (pedantic
&& ! in_system_header
&& warn_long_long
)
4160 pedwarn ("ANSI C does not support `long long'");
4164 else if (specbits
& (1 << i
))
4165 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id
));
4171 error ("two or more data types in declaration of `%s'", name
);
4172 /* Actual typedefs come to us as TYPE_DECL nodes. */
4173 else if (TREE_CODE (id
) == TYPE_DECL
)
4175 type
= TREE_TYPE (id
);
4176 decl_machine_attr
= DECL_MACHINE_ATTRIBUTES (id
);
4179 /* Built-in types come as identifiers. */
4180 else if (TREE_CODE (id
) == IDENTIFIER_NODE
)
4182 register tree t
= lookup_name (id
);
4183 if (TREE_TYPE (t
) == error_mark_node
)
4185 else if (!t
|| TREE_CODE (t
) != TYPE_DECL
)
4186 error ("`%s' fails to be a typedef or built in type",
4187 IDENTIFIER_POINTER (id
));
4190 type
= TREE_TYPE (t
);
4194 else if (TREE_CODE (id
) != ERROR_MARK
)
4200 typedef_type
= type
;
4202 size_varies
= C_TYPE_VARIABLE_SIZE (type
);
4204 /* No type at all: default to `int', and set DEFAULTED_INT
4205 because it was not a user-defined typedef. */
4209 if ((! (specbits
& ((1 << (int) RID_LONG
) | (1 << (int) RID_SHORT
)
4210 | (1 << (int) RID_SIGNED
)
4211 | (1 << (int) RID_UNSIGNED
))))
4212 /* Don't warn about typedef foo = bar. */
4213 && ! (specbits
& (1 << (int) RID_TYPEDEF
) && initialized
)
4214 && ! (in_system_header
&& ! allocation_temporary_p ()))
4216 /* Issue a warning if this is an ISO C 9x program or if -Wreturn-type
4217 and this is a function, or if -Wimplicit; prefer the former
4218 warning since it is more explicit. */
4219 if ((warn_implicit_int
|| warn_return_type
) && funcdef_flag
)
4220 warn_about_return_type
= 1;
4221 else if (warn_implicit_int
|| flag_isoc9x
)
4222 warning ("type defaults to `int' in declaration of `%s'", name
);
4226 type
= integer_type_node
;
4229 /* Now process the modifiers that were specified
4230 and check for invalid combinations. */
4232 /* Long double is a special combination. */
4234 if ((specbits
& 1 << (int) RID_LONG
) && ! longlong
4235 && TYPE_MAIN_VARIANT (type
) == double_type_node
)
4237 specbits
&= ~ (1 << (int) RID_LONG
);
4238 type
= long_double_type_node
;
4241 /* Check all other uses of type modifiers. */
4243 if (specbits
& ((1 << (int) RID_LONG
) | (1 << (int) RID_SHORT
)
4244 | (1 << (int) RID_UNSIGNED
) | (1 << (int) RID_SIGNED
)))
4248 if ((specbits
& 1 << (int) RID_LONG
)
4249 && (specbits
& 1 << (int) RID_SHORT
))
4250 error ("both long and short specified for `%s'", name
);
4251 else if (((specbits
& 1 << (int) RID_LONG
)
4252 || (specbits
& 1 << (int) RID_SHORT
))
4254 error ("long or short specified with char for `%s'", name
);
4255 else if (((specbits
& 1 << (int) RID_LONG
)
4256 || (specbits
& 1 << (int) RID_SHORT
))
4257 && TREE_CODE (type
) == REAL_TYPE
)
4259 static int already
= 0;
4261 error ("long or short specified with floating type for `%s'", name
);
4262 if (! already
&& ! pedantic
)
4264 error ("the only valid combination is `long double'");
4268 else if ((specbits
& 1 << (int) RID_SIGNED
)
4269 && (specbits
& 1 << (int) RID_UNSIGNED
))
4270 error ("both signed and unsigned specified for `%s'", name
);
4271 else if (TREE_CODE (type
) != INTEGER_TYPE
)
4272 error ("long, short, signed or unsigned invalid for `%s'", name
);
4276 if (!explicit_int
&& !defaulted_int
&& !explicit_char
&& pedantic
)
4278 pedwarn ("long, short, signed or unsigned used invalidly for `%s'",
4280 if (flag_pedantic_errors
)
4285 /* Discard the type modifiers if they are invalid. */
4288 specbits
&= ~((1 << (int) RID_LONG
) | (1 << (int) RID_SHORT
)
4289 | (1 << (int) RID_UNSIGNED
) | (1 << (int) RID_SIGNED
));
4294 if ((specbits
& (1 << (int) RID_COMPLEX
))
4295 && TREE_CODE (type
) != INTEGER_TYPE
&& TREE_CODE (type
) != REAL_TYPE
)
4297 error ("complex invalid for `%s'", name
);
4298 specbits
&= ~ (1 << (int) RID_COMPLEX
);
4301 /* Decide whether an integer type is signed or not.
4302 Optionally treat bitfields as signed by default. */
4303 if (specbits
& 1 << (int) RID_UNSIGNED
4304 /* Traditionally, all bitfields are unsigned. */
4305 || (bitfield
&& flag_traditional
4306 && (! explicit_flag_signed_bitfields
|| !flag_signed_bitfields
))
4307 || (bitfield
&& ! flag_signed_bitfields
4308 && (explicit_int
|| defaulted_int
|| explicit_char
4309 /* A typedef for plain `int' without `signed'
4310 can be controlled just like plain `int'. */
4311 || ! (typedef_decl
!= 0
4312 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl
)))
4313 && TREE_CODE (type
) != ENUMERAL_TYPE
4314 && !(specbits
& 1 << (int) RID_SIGNED
)))
4317 type
= long_long_unsigned_type_node
;
4318 else if (specbits
& 1 << (int) RID_LONG
)
4319 type
= long_unsigned_type_node
;
4320 else if (specbits
& 1 << (int) RID_SHORT
)
4321 type
= short_unsigned_type_node
;
4322 else if (type
== char_type_node
)
4323 type
= unsigned_char_type_node
;
4324 else if (typedef_decl
)
4325 type
= unsigned_type (type
);
4327 type
= unsigned_type_node
;
4329 else if ((specbits
& 1 << (int) RID_SIGNED
)
4330 && type
== char_type_node
)
4331 type
= signed_char_type_node
;
4333 type
= long_long_integer_type_node
;
4334 else if (specbits
& 1 << (int) RID_LONG
)
4335 type
= long_integer_type_node
;
4336 else if (specbits
& 1 << (int) RID_SHORT
)
4337 type
= short_integer_type_node
;
4339 if (specbits
& 1 << (int) RID_COMPLEX
)
4341 /* If we just have "complex", it is equivalent to
4342 "complex double", but if any modifiers at all are specified it is
4343 the complex form of TYPE. E.g, "complex short" is
4344 "complex short int". */
4346 if (defaulted_int
&& ! longlong
4347 && ! (specbits
& ((1 << (int) RID_LONG
) | (1 << (int) RID_SHORT
)
4348 | (1 << (int) RID_SIGNED
)
4349 | (1 << (int) RID_UNSIGNED
))))
4350 type
= complex_double_type_node
;
4351 else if (type
== integer_type_node
)
4352 type
= complex_integer_type_node
;
4353 else if (type
== float_type_node
)
4354 type
= complex_float_type_node
;
4355 else if (type
== double_type_node
)
4356 type
= complex_double_type_node
;
4357 else if (type
== long_double_type_node
)
4358 type
= complex_long_double_type_node
;
4360 type
= build_complex_type (type
);
4363 /* Figure out the type qualifiers for the declaration. There are
4364 two ways a declaration can become qualified. One is something
4365 like `const int i' where the `const' is explicit. Another is
4366 something like `typedef const int CI; CI i' where the type of the
4367 declaration contains the `const'. */
4368 constp
= !! (specbits
& 1 << (int) RID_CONST
) + TYPE_READONLY (type
);
4369 restrictp
= !! (specbits
& 1 << (int) RID_RESTRICT
) + TYPE_RESTRICT (type
);
4370 volatilep
= !! (specbits
& 1 << (int) RID_VOLATILE
) + TYPE_VOLATILE (type
);
4371 inlinep
= !! (specbits
& (1 << (int) RID_INLINE
));
4373 pedwarn ("duplicate `const'");
4375 pedwarn ("duplicate `restrict'");
4377 pedwarn ("duplicate `volatile'");
4378 if (! flag_gen_aux_info
&& (TYPE_QUALS (type
)))
4379 type
= TYPE_MAIN_VARIANT (type
);
4380 type_quals
= ((constp
? TYPE_QUAL_CONST
: 0)
4381 | (restrictp
? TYPE_QUAL_RESTRICT
: 0)
4382 | (volatilep
? TYPE_QUAL_VOLATILE
: 0));
4384 /* Warn if two storage classes are given. Default to `auto'. */
4389 if (specbits
& 1 << (int) RID_AUTO
) nclasses
++;
4390 if (specbits
& 1 << (int) RID_STATIC
) nclasses
++;
4391 if (specbits
& 1 << (int) RID_EXTERN
) nclasses
++;
4392 if (specbits
& 1 << (int) RID_REGISTER
) nclasses
++;
4393 if (specbits
& 1 << (int) RID_TYPEDEF
) nclasses
++;
4394 if (specbits
& 1 << (int) RID_ITERATOR
) nclasses
++;
4396 /* Warn about storage classes that are invalid for certain
4397 kinds of declarations (parameters, typenames, etc.). */
4400 error ("multiple storage classes in declaration of `%s'", name
);
4401 else if (funcdef_flag
4403 & ((1 << (int) RID_REGISTER
)
4404 | (1 << (int) RID_AUTO
)
4405 | (1 << (int) RID_TYPEDEF
))))
4407 if (specbits
& 1 << (int) RID_AUTO
4408 && (pedantic
|| current_binding_level
== global_binding_level
))
4409 pedwarn ("function definition declared `auto'");
4410 if (specbits
& 1 << (int) RID_REGISTER
)
4411 error ("function definition declared `register'");
4412 if (specbits
& 1 << (int) RID_TYPEDEF
)
4413 error ("function definition declared `typedef'");
4414 specbits
&= ~ ((1 << (int) RID_TYPEDEF
) | (1 << (int) RID_REGISTER
)
4415 | (1 << (int) RID_AUTO
));
4417 else if (decl_context
!= NORMAL
&& nclasses
> 0)
4419 if (decl_context
== PARM
&& specbits
& 1 << (int) RID_REGISTER
)
4423 error ((decl_context
== FIELD
4424 ? "storage class specified for structure field `%s'"
4425 : (decl_context
== PARM
4426 ? "storage class specified for parameter `%s'"
4427 : "storage class specified for typename")),
4429 specbits
&= ~ ((1 << (int) RID_TYPEDEF
) | (1 << (int) RID_REGISTER
)
4430 | (1 << (int) RID_AUTO
) | (1 << (int) RID_STATIC
)
4431 | (1 << (int) RID_EXTERN
));
4434 else if (specbits
& 1 << (int) RID_EXTERN
&& initialized
&& ! funcdef_flag
)
4436 /* `extern' with initialization is invalid if not at top level. */
4437 if (current_binding_level
== global_binding_level
)
4438 warning ("`%s' initialized and declared `extern'", name
);
4440 error ("`%s' has both `extern' and initializer", name
);
4442 else if (specbits
& 1 << (int) RID_EXTERN
&& funcdef_flag
4443 && current_binding_level
!= global_binding_level
)
4444 error ("nested function `%s' declared `extern'", name
);
4445 else if (current_binding_level
== global_binding_level
4446 && specbits
& (1 << (int) RID_AUTO
))
4447 error ("top-level declaration of `%s' specifies `auto'", name
);
4448 else if ((specbits
& 1 << (int) RID_ITERATOR
)
4449 && TREE_CODE (declarator
) != IDENTIFIER_NODE
)
4451 error ("iterator `%s' has derived type", name
);
4452 type
= error_mark_node
;
4454 else if ((specbits
& 1 << (int) RID_ITERATOR
)
4455 && TREE_CODE (type
) != INTEGER_TYPE
)
4457 error ("iterator `%s' has noninteger type", name
);
4458 type
= error_mark_node
;
4462 /* Now figure out the structure of the declarator proper.
4463 Descend through it, creating more complex types, until we reach
4464 the declared identifier (or NULL_TREE, in an absolute declarator). */
4466 while (declarator
&& TREE_CODE (declarator
) != IDENTIFIER_NODE
)
4468 if (type
== error_mark_node
)
4470 declarator
= TREE_OPERAND (declarator
, 0);
4474 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
4475 an INDIRECT_REF (for *...),
4476 a CALL_EXPR (for ...(...)),
4477 an identifier (for the name being declared)
4478 or a null pointer (for the place in an absolute declarator
4479 where the name was omitted).
4480 For the last two cases, we have just exited the loop.
4482 At this point, TYPE is the type of elements of an array,
4483 or for a function to return, or for a pointer to point to.
4484 After this sequence of ifs, TYPE is the type of the
4485 array or function or pointer, and DECLARATOR has had its
4486 outermost layer removed. */
4488 if (TREE_CODE (declarator
) == ARRAY_REF
)
4490 register tree itype
= NULL_TREE
;
4491 register tree size
= TREE_OPERAND (declarator
, 1);
4492 /* An uninitialized decl with `extern' is a reference. */
4493 int extern_ref
= !initialized
&& (specbits
& (1 << (int) RID_EXTERN
));
4494 /* The index is a signed object `sizetype' bits wide. */
4495 tree index_type
= signed_type (sizetype
);
4497 declarator
= TREE_OPERAND (declarator
, 0);
4499 /* Check for some types that there cannot be arrays of. */
4501 if (TYPE_MAIN_VARIANT (type
) == void_type_node
)
4503 error ("declaration of `%s' as array of voids", name
);
4504 type
= error_mark_node
;
4507 if (TREE_CODE (type
) == FUNCTION_TYPE
)
4509 error ("declaration of `%s' as array of functions", name
);
4510 type
= error_mark_node
;
4513 if (size
== error_mark_node
)
4514 type
= error_mark_node
;
4516 if (type
== error_mark_node
)
4519 /* If this is a block level extern, it must live past the end
4520 of the function so that we can check it against other extern
4521 declarations (IDENTIFIER_LIMBO_VALUE). */
4522 if (extern_ref
&& allocation_temporary_p ())
4523 end_temporary_allocation ();
4525 /* If size was specified, set ITYPE to a range-type for that size.
4526 Otherwise, ITYPE remains null. finish_decl may figure it out
4527 from an initial value. */
4531 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4532 STRIP_TYPE_NOPS (size
);
4534 if (TREE_CODE (TREE_TYPE (size
)) != INTEGER_TYPE
4535 && TREE_CODE (TREE_TYPE (size
)) != ENUMERAL_TYPE
)
4537 error ("size of array `%s' has non-integer type", name
);
4538 size
= integer_one_node
;
4541 if (pedantic
&& integer_zerop (size
))
4542 pedwarn ("ANSI C forbids zero-size array `%s'", name
);
4544 if (TREE_CODE (size
) == INTEGER_CST
)
4546 constant_expression_warning (size
);
4547 if (tree_int_cst_sgn (size
) < 0)
4549 error ("size of array `%s' is negative", name
);
4550 size
= integer_one_node
;
4555 /* Make sure the array size remains visibly nonconstant
4556 even if it is (eg) a const variable with known value. */
4561 if (TREE_CONSTANT (size
))
4562 pedwarn ("ANSI C forbids array `%s' whose size can't be evaluated", name
);
4564 pedwarn ("ANSI C forbids variable-size array `%s'", name
);
4568 /* Convert size to index_type, so that if it is a variable
4569 the computations will be done in the proper mode. */
4570 itype
= fold (build (MINUS_EXPR
, index_type
,
4571 convert (index_type
, size
),
4572 convert (index_type
, size_one_node
)));
4574 /* If that overflowed, the array is too big.
4575 ??? While a size of INT_MAX+1 technically shouldn't cause
4576 an overflow (because we subtract 1), the overflow is recorded
4577 during the conversion to index_type, before the subtraction.
4578 Handling this case seems like an unnecessary complication. */
4579 if (TREE_OVERFLOW (itype
))
4581 error ("size of array `%s' is too large", name
);
4582 type
= error_mark_node
;
4587 itype
= variable_size (itype
);
4588 itype
= build_index_type (itype
);
4591 #if 0 /* This had bad results for pointers to arrays, as in
4592 union incomplete (*foo)[4]; */
4593 /* Complain about arrays of incomplete types, except in typedefs. */
4595 if (TYPE_SIZE (type
) == 0
4596 /* Avoid multiple warnings for nested array types. */
4597 && TREE_CODE (type
) != ARRAY_TYPE
4598 && !(specbits
& (1 << (int) RID_TYPEDEF
))
4599 && !C_TYPE_BEING_DEFINED (type
))
4600 warning ("array type has incomplete element type");
4603 #if 0 /* We shouldn't have a function type here at all!
4604 Functions aren't allowed as array elements. */
4605 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
4606 && (constp
|| volatilep
))
4607 pedwarn ("ANSI C forbids const or volatile function types");
4610 /* Build the array type itself, then merge any constancy or
4611 volatility into the target type. We must do it in this order
4612 to ensure that the TYPE_MAIN_VARIANT field of the array type
4613 is set correctly. */
4615 type
= build_array_type (type
, itype
);
4617 type
= c_build_qualified_type (type
, type_quals
);
4619 #if 0 /* don't clear these; leave them set so that the array type
4620 or the variable is itself const or volatile. */
4621 type_quals
= TYPE_UNQUALIFIED
;
4625 C_TYPE_VARIABLE_SIZE (type
) = 1;
4627 else if (TREE_CODE (declarator
) == CALL_EXPR
)
4629 int extern_ref
= (!(specbits
& (1 << (int) RID_AUTO
))
4630 || current_binding_level
== global_binding_level
);
4633 /* Declaring a function type.
4634 Make sure we have a valid type for the function to return. */
4635 if (type
== error_mark_node
)
4640 /* Warn about some types functions can't return. */
4642 if (TREE_CODE (type
) == FUNCTION_TYPE
)
4644 error ("`%s' declared as function returning a function", name
);
4645 type
= integer_type_node
;
4647 if (TREE_CODE (type
) == ARRAY_TYPE
)
4649 error ("`%s' declared as function returning an array", name
);
4650 type
= integer_type_node
;
4653 #ifndef TRADITIONAL_RETURN_FLOAT
4654 /* Traditionally, declaring return type float means double. */
4656 if (flag_traditional
&& TYPE_MAIN_VARIANT (type
) == float_type_node
)
4657 type
= double_type_node
;
4658 #endif /* TRADITIONAL_RETURN_FLOAT */
4660 /* If this is a block level extern, it must live past the end
4661 of the function so that we can check it against other extern
4662 declarations (IDENTIFIER_LIMBO_VALUE). */
4663 if (extern_ref
&& allocation_temporary_p ())
4664 end_temporary_allocation ();
4666 /* Construct the function type and go to the next
4667 inner layer of declarator. */
4669 arg_types
= grokparms (TREE_OPERAND (declarator
, 1),
4671 /* Say it's a definition
4672 only for the CALL_EXPR
4673 closest to the identifier. */
4674 && TREE_CODE (TREE_OPERAND (declarator
, 0)) == IDENTIFIER_NODE
);
4675 #if 0 /* This seems to be false. We turn off temporary allocation
4676 above in this function if -traditional.
4677 And this code caused inconsistent results with prototypes:
4678 callers would ignore them, and pass arguments wrong. */
4680 /* Omit the arg types if -traditional, since the arg types
4681 and the list links might not be permanent. */
4682 type
= build_function_type (type
,
4684 ? NULL_TREE
: arg_types
);
4686 /* Type qualifiers before the return type of the function
4687 qualify the return type, not the function type. */
4689 type
= c_build_qualified_type (type
, type_quals
);
4690 type_quals
= TYPE_UNQUALIFIED
;
4692 type
= build_function_type (type
, arg_types
);
4693 declarator
= TREE_OPERAND (declarator
, 0);
4695 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4696 the formal parameter list of this FUNCTION_TYPE to point to
4697 the FUNCTION_TYPE node itself. */
4702 for (link
= last_function_parm_tags
;
4704 link
= TREE_CHAIN (link
))
4705 TYPE_CONTEXT (TREE_VALUE (link
)) = type
;
4708 else if (TREE_CODE (declarator
) == INDIRECT_REF
)
4710 /* Merge any constancy or volatility into the target type
4713 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
4715 pedwarn ("ANSI C forbids qualified function types");
4717 type
= c_build_qualified_type (type
, type_quals
);
4718 type_quals
= TYPE_UNQUALIFIED
;
4721 type
= build_pointer_type (type
);
4723 /* Process a list of type modifier keywords
4724 (such as const or volatile) that were given inside the `*'. */
4726 if (TREE_TYPE (declarator
))
4728 register tree typemodlist
;
4734 for (typemodlist
= TREE_TYPE (declarator
); typemodlist
;
4735 typemodlist
= TREE_CHAIN (typemodlist
))
4737 tree qualifier
= TREE_VALUE (typemodlist
);
4739 if (qualifier
== ridpointers
[(int) RID_CONST
])
4741 else if (qualifier
== ridpointers
[(int) RID_VOLATILE
])
4743 else if (qualifier
== ridpointers
[(int) RID_RESTRICT
])
4748 error ("invalid type modifier within pointer declarator");
4752 pedwarn ("duplicate `const'");
4754 pedwarn ("duplicate `volatile'");
4756 pedwarn ("duplicate `restrict'");
4758 type_quals
= ((constp
? TYPE_QUAL_CONST
: 0)
4759 | (restrictp
? TYPE_QUAL_RESTRICT
: 0)
4760 | (volatilep
? TYPE_QUAL_VOLATILE
: 0));
4763 declarator
= TREE_OPERAND (declarator
, 0);
4770 /* Now TYPE has the actual type. */
4772 /* Did array size calculations overflow? */
4774 if (TREE_CODE (type
) == ARRAY_TYPE
4776 && TREE_OVERFLOW (TYPE_SIZE (type
)))
4777 error ("size of array `%s' is too large", name
);
4779 /* If this is declaring a typedef name, return a TYPE_DECL. */
4781 if (specbits
& (1 << (int) RID_TYPEDEF
))
4784 /* Note that the grammar rejects storage classes
4785 in typenames, fields or parameters */
4786 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
4788 pedwarn ("ANSI C forbids qualified function types");
4790 type
= c_build_qualified_type (type
, type_quals
);
4791 decl
= build_decl (TYPE_DECL
, declarator
, type
);
4792 if ((specbits
& (1 << (int) RID_SIGNED
))
4793 || (typedef_decl
&& C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl
)))
4794 C_TYPEDEF_EXPLICITLY_SIGNED (decl
) = 1;
4799 /* Detect the case of an array type of unspecified size
4800 which came, as such, direct from a typedef name.
4801 We must copy the type, so that each identifier gets
4802 a distinct type, so that each identifier's size can be
4803 controlled separately by its own initializer. */
4805 if (type
!= 0 && typedef_type
!= 0
4806 && TYPE_MAIN_VARIANT (type
) == TYPE_MAIN_VARIANT (typedef_type
)
4807 && TREE_CODE (type
) == ARRAY_TYPE
&& TYPE_DOMAIN (type
) == 0)
4809 type
= build_array_type (TREE_TYPE (type
), 0);
4811 C_TYPE_VARIABLE_SIZE (type
) = 1;
4814 /* If this is a type name (such as, in a cast or sizeof),
4815 compute the type and return it now. */
4817 if (decl_context
== TYPENAME
)
4819 /* Note that the grammar rejects storage classes
4820 in typenames, fields or parameters */
4821 if (pedantic
&& TREE_CODE (type
) == FUNCTION_TYPE
4823 pedwarn ("ANSI C forbids const or volatile function types");
4825 type
= c_build_qualified_type (type
, type_quals
);
4830 /* Aside from typedefs and type names (handle above),
4831 `void' at top level (not within pointer)
4832 is allowed only in public variables.
4833 We don't complain about parms either, but that is because
4834 a better error message can be made later. */
4836 if (TYPE_MAIN_VARIANT (type
) == void_type_node
&& decl_context
!= PARM
4837 && ! ((decl_context
!= FIELD
&& TREE_CODE (type
) != FUNCTION_TYPE
)
4838 && ((specbits
& (1 << (int) RID_EXTERN
))
4839 || (current_binding_level
== global_binding_level
4841 & ((1 << (int) RID_STATIC
) | (1 << (int) RID_REGISTER
)))))))
4843 error ("variable or field `%s' declared void", name
);
4844 type
= integer_type_node
;
4847 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4848 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4853 if (decl_context
== PARM
)
4855 tree type_as_written
= type
;
4858 /* A parameter declared as an array of T is really a pointer to T.
4859 One declared as a function is really a pointer to a function. */
4861 if (TREE_CODE (type
) == ARRAY_TYPE
)
4863 /* Transfer const-ness of array into that of type pointed to. */
4864 type
= TREE_TYPE (type
);
4866 type
= c_build_qualified_type (type
, type_quals
);
4867 type
= build_pointer_type (type
);
4868 type_quals
= TYPE_UNQUALIFIED
;
4871 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
4873 if (pedantic
&& type_quals
)
4874 pedwarn ("ANSI C forbids qualified function types");
4876 type
= c_build_qualified_type (type
, type_quals
);
4877 type
= build_pointer_type (type
);
4878 type_quals
= TYPE_UNQUALIFIED
;
4881 decl
= build_decl (PARM_DECL
, declarator
, type
);
4883 C_DECL_VARIABLE_SIZE (decl
) = 1;
4885 /* Compute the type actually passed in the parmlist,
4886 for the case where there is no prototype.
4887 (For example, shorts and chars are passed as ints.)
4888 When there is a prototype, this is overridden later. */
4890 DECL_ARG_TYPE (decl
) = type
;
4891 main_type
= (type
== error_mark_node
4893 : TYPE_MAIN_VARIANT (type
));
4894 if (main_type
== float_type_node
)
4895 DECL_ARG_TYPE (decl
) = double_type_node
;
4896 /* Don't use TYPE_PRECISION to decide whether to promote,
4897 because we should convert short if it's the same size as int,
4898 but we should not convert long if it's the same size as int. */
4899 else if (TREE_CODE (main_type
) != ERROR_MARK
4900 && C_PROMOTING_INTEGER_TYPE_P (main_type
))
4902 if (TYPE_PRECISION (type
) == TYPE_PRECISION (integer_type_node
)
4903 && TREE_UNSIGNED (type
))
4904 DECL_ARG_TYPE (decl
) = unsigned_type_node
;
4906 DECL_ARG_TYPE (decl
) = integer_type_node
;
4909 DECL_ARG_TYPE_AS_WRITTEN (decl
) = type_as_written
;
4911 else if (decl_context
== FIELD
)
4913 /* Structure field. It may not be a function. */
4915 if (TREE_CODE (type
) == FUNCTION_TYPE
)
4917 error ("field `%s' declared as a function", name
);
4918 type
= build_pointer_type (type
);
4920 else if (TREE_CODE (type
) != ERROR_MARK
&& TYPE_SIZE (type
) == 0)
4922 error ("field `%s' has incomplete type", name
);
4923 type
= error_mark_node
;
4925 /* Move type qualifiers down to element of an array. */
4926 if (TREE_CODE (type
) == ARRAY_TYPE
&& type_quals
)
4928 type
= build_array_type (c_build_qualified_type (TREE_TYPE (type
),
4930 TYPE_DOMAIN (type
));
4931 #if 0 /* Leave the field const or volatile as well. */
4932 type_quals
= TYPE_UNQUALIFIED
;
4935 decl
= build_decl (FIELD_DECL
, declarator
, type
);
4937 C_DECL_VARIABLE_SIZE (decl
) = 1;
4939 else if (TREE_CODE (type
) == FUNCTION_TYPE
)
4941 /* Every function declaration is "external"
4942 except for those which are inside a function body
4943 in which `auto' is used.
4944 That is a case not specified by ANSI C,
4945 and we use it for forward declarations for nested functions. */
4946 int extern_ref
= (!(specbits
& (1 << (int) RID_AUTO
))
4947 || current_binding_level
== global_binding_level
);
4949 if (specbits
& (1 << (int) RID_AUTO
)
4950 && (pedantic
|| current_binding_level
== global_binding_level
))
4951 pedwarn ("invalid storage class for function `%s'", name
);
4952 if (specbits
& (1 << (int) RID_REGISTER
))
4953 error ("invalid storage class for function `%s'", name
);
4954 /* Function declaration not at top level.
4955 Storage classes other than `extern' are not allowed
4956 and `extern' makes no difference. */
4957 if (current_binding_level
!= global_binding_level
4958 && (specbits
& ((1 << (int) RID_STATIC
) | (1 << (int) RID_INLINE
)))
4960 pedwarn ("invalid storage class for function `%s'", name
);
4962 /* If this is a block level extern, it must live past the end
4963 of the function so that we can check it against other
4964 extern declarations (IDENTIFIER_LIMBO_VALUE). */
4965 if (extern_ref
&& allocation_temporary_p ())
4966 end_temporary_allocation ();
4968 decl
= build_decl (FUNCTION_DECL
, declarator
, type
);
4969 decl
= build_decl_attribute_variant (decl
, decl_machine_attr
);
4971 if (pedantic
&& type_quals
&& ! DECL_IN_SYSTEM_HEADER (decl
))
4972 pedwarn ("ANSI C forbids qualified function types");
4975 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl
))) == void_type_node
4976 && TYPE_QUALS (TREE_TYPE (TREE_TYPE (decl
)))
4977 && ! DECL_IN_SYSTEM_HEADER (decl
))
4978 pedwarn ("ANSI C forbids qualified void function return type");
4980 /* GNU C interprets a `volatile void' return type to indicate
4981 that the function does not return. */
4982 if ((type_quals
& TYPE_QUAL_VOLATILE
)
4983 && TREE_TYPE (TREE_TYPE (decl
)) != void_type_node
)
4984 warning ("`noreturn' function returns non-void value");
4987 DECL_EXTERNAL (decl
) = 1;
4988 /* Record absence of global scope for `static' or `auto'. */
4990 = !(specbits
& ((1 << (int) RID_STATIC
) | (1 << (int) RID_AUTO
)));
4992 /* Record presence of `inline', if it is reasonable. */
4995 if (! strcmp (IDENTIFIER_POINTER (declarator
), "main"))
4996 warning ("cannot inline function `main'");
4998 /* Assume that otherwise the function can be inlined. */
4999 DECL_INLINE (decl
) = 1;
5001 if (specbits
& (1 << (int) RID_EXTERN
))
5002 current_extern_inline
= 1;
5007 /* It's a variable. */
5008 /* An uninitialized decl with `extern' is a reference. */
5009 int extern_ref
= !initialized
&& (specbits
& (1 << (int) RID_EXTERN
));
5011 /* Move type qualifiers down to element of an array. */
5012 if (TREE_CODE (type
) == ARRAY_TYPE
&& type_quals
)
5014 type
= build_array_type (c_build_qualified_type (TREE_TYPE (type
),
5016 TYPE_DOMAIN (type
));
5017 #if 0 /* Leave the variable const or volatile as well. */
5018 type_quals
= TYPE_UNQUALIFIED
;
5022 /* If this is a block level extern, it must live past the end
5023 of the function so that we can check it against other
5024 extern declarations (IDENTIFIER_LIMBO_VALUE). */
5025 if (extern_ref
&& allocation_temporary_p ())
5026 end_temporary_allocation ();
5028 decl
= build_decl (VAR_DECL
, declarator
, type
);
5030 C_DECL_VARIABLE_SIZE (decl
) = 1;
5033 pedwarn_with_decl (decl
, "variable `%s' declared `inline'");
5035 DECL_EXTERNAL (decl
) = extern_ref
;
5036 /* At top level, the presence of a `static' or `register' storage
5037 class specifier, or the absence of all storage class specifiers
5038 makes this declaration a definition (perhaps tentative). Also,
5039 the absence of both `static' and `register' makes it public. */
5040 if (current_binding_level
== global_binding_level
)
5044 & ((1 << (int) RID_STATIC
) | (1 << (int) RID_REGISTER
)));
5045 TREE_STATIC (decl
) = ! DECL_EXTERNAL (decl
);
5047 /* Not at top level, only `static' makes a static definition. */
5050 TREE_STATIC (decl
) = (specbits
& (1 << (int) RID_STATIC
)) != 0;
5051 TREE_PUBLIC (decl
) = DECL_EXTERNAL (decl
);
5054 if (specbits
& 1 << (int) RID_ITERATOR
)
5055 ITERATOR_P (decl
) = 1;
5058 /* Record `register' declaration for warnings on &
5059 and in case doing stupid register allocation. */
5061 if (specbits
& (1 << (int) RID_REGISTER
))
5062 DECL_REGISTER (decl
) = 1;
5064 /* Record constancy and volatility. */
5065 c_apply_type_quals_to_decl (type_quals
, decl
);
5067 /* If a type has volatile components, it should be stored in memory.
5068 Otherwise, the fact that those components are volatile
5069 will be ignored, and would even crash the compiler. */
5070 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl
)))
5071 mark_addressable (decl
);
5079 /* Decode the parameter-list info for a function type or function definition.
5080 The argument is the value returned by `get_parm_info' (or made in parse.y
5081 if there is an identifier list instead of a parameter decl list).
5082 These two functions are separate because when a function returns
5083 or receives functions then each is called multiple times but the order
5084 of calls is different. The last call to `grokparms' is always the one
5085 that contains the formal parameter names of a function definition.
5087 Store in `last_function_parms' a chain of the decls of parms.
5088 Also store in `last_function_parm_tags' a chain of the struct, union,
5089 and enum tags declared among the parms.
5091 Return a list of arg types to use in the FUNCTION_TYPE for this function.
5093 FUNCDEF_FLAG is nonzero for a function definition, 0 for
5094 a mere declaration. A nonempty identifier-list gets an error message
5095 when FUNCDEF_FLAG is zero. */
5098 grokparms (parms_info
, funcdef_flag
)
5102 tree first_parm
= TREE_CHAIN (parms_info
);
5104 last_function_parms
= TREE_PURPOSE (parms_info
);
5105 last_function_parm_tags
= TREE_VALUE (parms_info
);
5107 if (warn_strict_prototypes
&& first_parm
== 0 && !funcdef_flag
5108 && !in_system_header
)
5109 warning ("function declaration isn't a prototype");
5112 && TREE_CODE (TREE_VALUE (first_parm
)) == IDENTIFIER_NODE
)
5115 pedwarn ("parameter names (without types) in function declaration");
5117 last_function_parms
= first_parm
;
5124 /* We no longer test FUNCDEF_FLAG.
5125 If the arg types are incomplete in a declaration,
5126 they must include undefined tags.
5127 These tags can never be defined in the scope of the declaration,
5128 so the types can never be completed,
5129 and no call can be compiled successfully. */
5131 /* In a fcn definition, arg types must be complete. */
5134 for (parm
= last_function_parms
, typelt
= first_parm
;
5136 parm
= TREE_CHAIN (parm
))
5137 /* Skip over any enumeration constants declared here. */
5138 if (TREE_CODE (parm
) == PARM_DECL
)
5140 /* Barf if the parameter itself has an incomplete type. */
5141 tree type
= TREE_VALUE (typelt
);
5142 if (TYPE_SIZE (type
) == 0)
5144 if (funcdef_flag
&& DECL_NAME (parm
) != 0)
5145 error ("parameter `%s' has incomplete type",
5146 IDENTIFIER_POINTER (DECL_NAME (parm
)));
5148 warning ("parameter has incomplete type");
5151 TREE_VALUE (typelt
) = error_mark_node
;
5152 TREE_TYPE (parm
) = error_mark_node
;
5155 #if 0 /* This has been replaced by parm_tags_warning
5156 which uses a more accurate criterion for what to warn about. */
5159 /* Now warn if is a pointer to an incomplete type. */
5160 while (TREE_CODE (type
) == POINTER_TYPE
5161 || TREE_CODE (type
) == REFERENCE_TYPE
)
5162 type
= TREE_TYPE (type
);
5163 type
= TYPE_MAIN_VARIANT (type
);
5164 if (TYPE_SIZE (type
) == 0)
5166 if (DECL_NAME (parm
) != 0)
5167 warning ("parameter `%s' points to incomplete type",
5168 IDENTIFIER_POINTER (DECL_NAME (parm
)));
5170 warning ("parameter points to incomplete type");
5174 typelt
= TREE_CHAIN (typelt
);
5177 /* Allocate the list of types the way we allocate a type. */
5178 if (first_parm
&& ! TREE_PERMANENT (first_parm
))
5180 /* Construct a copy of the list of types
5181 on the saveable obstack. */
5183 for (typelt
= first_parm
; typelt
; typelt
= TREE_CHAIN (typelt
))
5184 result
= saveable_tree_cons (NULL_TREE
, TREE_VALUE (typelt
),
5186 return nreverse (result
);
5189 /* The list we have is permanent already. */
5195 /* Return a tree_list node with info on a parameter list just parsed.
5196 The TREE_PURPOSE is a chain of decls of those parms.
5197 The TREE_VALUE is a list of structure, union and enum tags defined.
5198 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
5199 This tree_list node is later fed to `grokparms'.
5201 VOID_AT_END nonzero means append `void' to the end of the type-list.
5202 Zero means the parmlist ended with an ellipsis so don't append `void'. */
5205 get_parm_info (void_at_end
)
5208 register tree decl
, t
;
5209 register tree types
= 0;
5211 tree tags
= gettags ();
5212 tree parms
= getdecls ();
5214 tree order
= current_binding_level
->parm_order
;
5216 /* Just `void' (and no ellipsis) is special. There are really no parms. */
5217 if (void_at_end
&& parms
!= 0
5218 && TREE_CHAIN (parms
) == 0
5219 && TYPE_MAIN_VARIANT (TREE_TYPE (parms
)) == void_type_node
5220 && DECL_NAME (parms
) == 0)
5223 storedecls (NULL_TREE
);
5224 return saveable_tree_cons (NULL_TREE
, NULL_TREE
,
5225 saveable_tree_cons (NULL_TREE
, void_type_node
, NULL_TREE
));
5228 /* Extract enumerator values and other non-parms declared with the parms.
5229 Likewise any forward parm decls that didn't have real parm decls. */
5230 for (decl
= parms
; decl
; )
5232 tree next
= TREE_CHAIN (decl
);
5234 if (TREE_CODE (decl
) != PARM_DECL
)
5236 TREE_CHAIN (decl
) = new_parms
;
5239 else if (TREE_ASM_WRITTEN (decl
))
5241 error_with_decl (decl
, "parameter `%s' has just a forward declaration");
5242 TREE_CHAIN (decl
) = new_parms
;
5248 /* Put the parm decls back in the order they were in in the parm list. */
5249 for (t
= order
; t
; t
= TREE_CHAIN (t
))
5252 TREE_CHAIN (TREE_VALUE (t
)) = TREE_VALUE (TREE_CHAIN (t
));
5254 TREE_CHAIN (TREE_VALUE (t
)) = 0;
5257 new_parms
= chainon (order
? nreverse (TREE_VALUE (order
)) : 0,
5260 /* Store the parmlist in the binding level since the old one
5261 is no longer a valid list. (We have changed the chain pointers.) */
5262 storedecls (new_parms
);
5264 for (decl
= new_parms
; decl
; decl
= TREE_CHAIN (decl
))
5265 /* There may also be declarations for enumerators if an enumeration
5266 type is declared among the parms. Ignore them here. */
5267 if (TREE_CODE (decl
) == PARM_DECL
)
5269 /* Since there is a prototype,
5270 args are passed in their declared types. */
5271 tree type
= TREE_TYPE (decl
);
5272 DECL_ARG_TYPE (decl
) = type
;
5273 if (PROMOTE_PROTOTYPES
5274 && (TREE_CODE (type
) == INTEGER_TYPE
5275 || TREE_CODE (type
) == ENUMERAL_TYPE
)
5276 && TYPE_PRECISION (type
) < TYPE_PRECISION (integer_type_node
))
5277 DECL_ARG_TYPE (decl
) = integer_type_node
;
5279 types
= saveable_tree_cons (NULL_TREE
, TREE_TYPE (decl
), types
);
5280 if (TYPE_MAIN_VARIANT (TREE_VALUE (types
)) == void_type_node
&& ! erred
5281 && DECL_NAME (decl
) == 0)
5283 error ("`void' in parameter list must be the entire list");
5289 return saveable_tree_cons (new_parms
, tags
,
5290 nreverse (saveable_tree_cons (NULL_TREE
, void_type_node
, types
)));
5292 return saveable_tree_cons (new_parms
, tags
, nreverse (types
));
5295 /* At end of parameter list, warn about any struct, union or enum tags
5296 defined within. Do so because these types cannot ever become complete. */
5299 parmlist_tags_warning ()
5304 for (elt
= current_binding_level
->tags
; elt
; elt
= TREE_CHAIN (elt
))
5306 enum tree_code code
= TREE_CODE (TREE_VALUE (elt
));
5307 /* An anonymous union parm type is meaningful as a GNU extension.
5308 So don't warn for that. */
5309 if (code
== UNION_TYPE
&& TREE_PURPOSE (elt
) == 0 && !pedantic
)
5311 if (TREE_PURPOSE (elt
) != 0)
5312 warning ("`%s %s' declared inside parameter list",
5313 (code
== RECORD_TYPE
? "struct"
5314 : code
== UNION_TYPE
? "union"
5316 IDENTIFIER_POINTER (TREE_PURPOSE (elt
)));
5318 warning ("anonymous %s declared inside parameter list",
5319 (code
== RECORD_TYPE
? "struct"
5320 : code
== UNION_TYPE
? "union"
5325 warning ("its scope is only this definition or declaration, which is probably not what you want.");
5331 /* Get the struct, enum or union (CODE says which) with tag NAME.
5332 Define the tag as a forward-reference if it is not defined. */
5335 xref_tag (code
, name
)
5336 enum tree_code code
;
5339 int temporary
= allocation_temporary_p ();
5341 /* If a cross reference is requested, look up the type
5342 already defined for this tag and return it. */
5344 register tree ref
= lookup_tag (code
, name
, current_binding_level
, 0);
5345 /* Even if this is the wrong type of tag, return what we found.
5346 There will be an error message anyway, from pending_xref_error.
5347 If we create an empty xref just for an invalid use of the type,
5348 the main result is to create lots of superfluous error messages. */
5352 push_obstacks_nochange ();
5354 if (current_binding_level
== global_binding_level
&& temporary
)
5355 end_temporary_allocation ();
5357 /* If no such tag is yet defined, create a forward-reference node
5358 and record it as the "definition".
5359 When a real declaration of this type is found,
5360 the forward-reference will be altered into a real type. */
5362 ref
= make_node (code
);
5363 if (code
== ENUMERAL_TYPE
)
5365 /* (In ANSI, Enums can be referred to only if already defined.) */
5367 pedwarn ("ANSI C forbids forward references to `enum' types");
5368 /* Give the type a default layout like unsigned int
5369 to avoid crashing if it does not get defined. */
5370 TYPE_MODE (ref
) = TYPE_MODE (unsigned_type_node
);
5371 TYPE_ALIGN (ref
) = TYPE_ALIGN (unsigned_type_node
);
5372 TREE_UNSIGNED (ref
) = 1;
5373 TYPE_PRECISION (ref
) = TYPE_PRECISION (unsigned_type_node
);
5374 TYPE_MIN_VALUE (ref
) = TYPE_MIN_VALUE (unsigned_type_node
);
5375 TYPE_MAX_VALUE (ref
) = TYPE_MAX_VALUE (unsigned_type_node
);
5378 pushtag (name
, ref
);
5385 /* Make sure that the tag NAME is defined *in the current binding level*
5386 at least as a forward reference.
5387 CODE says which kind of tag NAME ought to be.
5389 We also do a push_obstacks_nochange
5390 whose matching pop is in finish_struct. */
5393 start_struct (code
, name
)
5394 enum tree_code code
;
5397 /* If there is already a tag defined at this binding level
5398 (as a forward reference), just return it. */
5400 register tree ref
= 0;
5402 push_obstacks_nochange ();
5403 if (current_binding_level
== global_binding_level
)
5404 end_temporary_allocation ();
5407 ref
= lookup_tag (code
, name
, current_binding_level
, 1);
5408 if (ref
&& TREE_CODE (ref
) == code
)
5410 C_TYPE_BEING_DEFINED (ref
) = 1;
5411 TYPE_PACKED (ref
) = flag_pack_struct
;
5412 if (TYPE_FIELDS (ref
))
5413 error ((code
== UNION_TYPE
? "redefinition of `union %s'"
5414 : "redefinition of `struct %s'"),
5415 IDENTIFIER_POINTER (name
));
5420 /* Otherwise create a forward-reference just so the tag is in scope. */
5422 ref
= make_node (code
);
5423 pushtag (name
, ref
);
5424 C_TYPE_BEING_DEFINED (ref
) = 1;
5425 TYPE_PACKED (ref
) = flag_pack_struct
;
5429 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
5430 of a structure component, returning a FIELD_DECL node.
5431 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
5433 This is done during the parsing of the struct declaration.
5434 The FIELD_DECL nodes are chained together and the lot of them
5435 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5438 grokfield (filename
, line
, declarator
, declspecs
, width
)
5439 const char *filename ATTRIBUTE_UNUSED
;
5440 int line ATTRIBUTE_UNUSED
;
5441 tree declarator
, declspecs
, width
;
5445 /* The corresponding pop_obstacks is in finish_decl. */
5446 push_obstacks_nochange ();
5448 value
= grokdeclarator (declarator
, declspecs
, width
? BITFIELD
: FIELD
, 0);
5450 finish_decl (value
, NULL_TREE
, NULL_TREE
);
5451 DECL_INITIAL (value
) = width
;
5453 maybe_objc_check_decl (value
);
5457 /* Function to help qsort sort FIELD_DECLs by name order. */
5460 field_decl_cmp (xp
, yp
)
5461 const GENERIC_PTR xp
;
5462 const GENERIC_PTR yp
;
5464 tree
*x
= (tree
*)xp
, *y
= (tree
*)yp
;
5466 if (DECL_NAME (*x
) == DECL_NAME (*y
))
5468 if (DECL_NAME (*x
) == NULL
)
5470 if (DECL_NAME (*y
) == NULL
)
5472 if (DECL_NAME (*x
) < DECL_NAME (*y
))
5477 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5478 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5479 ATTRIBUTES are attributes to be applied to the structure.
5481 We also do a pop_obstacks to match the push in start_struct. */
5484 finish_struct (t
, fieldlist
, attributes
)
5491 int toplevel
= global_binding_level
== current_binding_level
;
5493 /* If this type was previously laid out as a forward reference,
5494 make sure we lay it out again. */
5498 decl_attributes (t
, attributes
, NULL_TREE
);
5500 /* Nameless union parm types are useful as GCC extension. */
5501 if (! (TREE_CODE (t
) == UNION_TYPE
&& TYPE_NAME (t
) == 0) && !pedantic
)
5502 /* Otherwise, warn about any struct or union def. in parmlist. */
5503 if (in_parm_level_p ())
5506 pedwarn ((TREE_CODE (t
) == UNION_TYPE
? "union defined inside parms"
5507 : "structure defined inside parms"));
5508 else if (! flag_traditional
)
5509 warning ((TREE_CODE (t
) == UNION_TYPE
? "union defined inside parms"
5510 : "structure defined inside parms"));
5513 old_momentary
= suspend_momentary ();
5517 for (x
= fieldlist
; x
; x
= TREE_CHAIN (x
))
5518 if (DECL_NAME (x
) != 0)
5523 ? "%s has no named members"
5524 : "%s has no members"),
5525 TREE_CODE (t
) == UNION_TYPE
? "union" : "struct");
5528 /* Install struct as DECL_CONTEXT of each field decl.
5529 Also process specified field sizes.
5530 Set DECL_FIELD_SIZE to the specified size, or 0 if none specified.
5531 The specified size is found in the DECL_INITIAL.
5532 Store 0 there, except for ": 0" fields (so we can find them
5533 and delete them, below). */
5535 for (x
= fieldlist
; x
; x
= TREE_CHAIN (x
))
5537 DECL_CONTEXT (x
) = t
;
5538 DECL_PACKED (x
) |= TYPE_PACKED (t
);
5539 DECL_FIELD_SIZE (x
) = 0;
5541 /* If any field is const, the structure type is pseudo-const. */
5542 if (TREE_READONLY (x
))
5543 C_TYPE_FIELDS_READONLY (t
) = 1;
5546 /* A field that is pseudo-const makes the structure likewise. */
5547 tree t1
= TREE_TYPE (x
);
5548 while (TREE_CODE (t1
) == ARRAY_TYPE
)
5549 t1
= TREE_TYPE (t1
);
5550 if ((TREE_CODE (t1
) == RECORD_TYPE
|| TREE_CODE (t1
) == UNION_TYPE
)
5551 && C_TYPE_FIELDS_READONLY (t1
))
5552 C_TYPE_FIELDS_READONLY (t
) = 1;
5555 /* Any field that is volatile means variables of this type must be
5556 treated in some ways as volatile. */
5557 if (TREE_THIS_VOLATILE (x
))
5558 C_TYPE_FIELDS_VOLATILE (t
) = 1;
5560 /* Any field of nominal variable size implies structure is too. */
5561 if (C_DECL_VARIABLE_SIZE (x
))
5562 C_TYPE_VARIABLE_SIZE (t
) = 1;
5564 /* Detect invalid nested redefinition. */
5565 if (TREE_TYPE (x
) == t
)
5566 error ("nested redefinition of `%s'",
5567 IDENTIFIER_POINTER (TYPE_NAME (t
)));
5569 /* Detect invalid bit-field size. */
5570 if (DECL_INITIAL (x
))
5571 STRIP_NOPS (DECL_INITIAL (x
));
5572 if (DECL_INITIAL (x
))
5574 if (TREE_CODE (DECL_INITIAL (x
)) == INTEGER_CST
)
5575 constant_expression_warning (DECL_INITIAL (x
));
5578 error_with_decl (x
, "bit-field `%s' width not an integer constant");
5579 DECL_INITIAL (x
) = NULL
;
5583 /* Detect invalid bit-field type. */
5584 if (DECL_INITIAL (x
)
5585 && TREE_CODE (TREE_TYPE (x
)) != INTEGER_TYPE
5586 && TREE_CODE (TREE_TYPE (x
)) != ENUMERAL_TYPE
)
5588 error_with_decl (x
, "bit-field `%s' has invalid type");
5589 DECL_INITIAL (x
) = NULL
;
5591 if (DECL_INITIAL (x
) && pedantic
5592 && TYPE_MAIN_VARIANT (TREE_TYPE (x
)) != integer_type_node
5593 && TYPE_MAIN_VARIANT (TREE_TYPE (x
)) != unsigned_type_node
5594 /* Accept an enum that's equivalent to int or unsigned int. */
5595 && !(TREE_CODE (TREE_TYPE (x
)) == ENUMERAL_TYPE
5596 && (TYPE_PRECISION (TREE_TYPE (x
))
5597 == TYPE_PRECISION (integer_type_node
))))
5598 pedwarn_with_decl (x
, "bit-field `%s' type invalid in ANSI C");
5600 /* Detect and ignore out of range field width. */
5601 if (DECL_INITIAL (x
))
5603 unsigned HOST_WIDE_INT width
= TREE_INT_CST_LOW (DECL_INITIAL (x
));
5605 if (tree_int_cst_sgn (DECL_INITIAL (x
)) < 0)
5607 DECL_INITIAL (x
) = NULL
;
5608 error_with_decl (x
, "negative width in bit-field `%s'");
5610 else if (TREE_INT_CST_HIGH (DECL_INITIAL (x
)) != 0
5611 || width
> TYPE_PRECISION (TREE_TYPE (x
)))
5613 DECL_INITIAL (x
) = NULL
;
5614 pedwarn_with_decl (x
, "width of `%s' exceeds its type");
5616 else if (width
== 0 && DECL_NAME (x
) != 0)
5618 error_with_decl (x
, "zero width for bit-field `%s'");
5619 DECL_INITIAL (x
) = NULL
;
5623 /* Process valid field width. */
5624 if (DECL_INITIAL (x
))
5626 register int width
= TREE_INT_CST_LOW (DECL_INITIAL (x
));
5628 if (TREE_CODE (TREE_TYPE (x
)) == ENUMERAL_TYPE
5629 && (width
< min_precision (TYPE_MIN_VALUE (TREE_TYPE (x
)),
5630 TREE_UNSIGNED (TREE_TYPE (x
)))
5631 || width
< min_precision (TYPE_MAX_VALUE (TREE_TYPE (x
)),
5632 TREE_UNSIGNED (TREE_TYPE (x
)))))
5633 warning_with_decl (x
, "`%s' is narrower than values of its type");
5635 DECL_FIELD_SIZE (x
) = width
;
5636 DECL_BIT_FIELD (x
) = DECL_C_BIT_FIELD (x
) = 1;
5637 DECL_INITIAL (x
) = NULL
;
5641 /* field size 0 => force desired amount of alignment. */
5642 #ifdef EMPTY_FIELD_BOUNDARY
5643 DECL_ALIGN (x
) = MAX (DECL_ALIGN (x
), EMPTY_FIELD_BOUNDARY
);
5645 #ifdef PCC_BITFIELD_TYPE_MATTERS
5646 if (PCC_BITFIELD_TYPE_MATTERS
)
5647 DECL_ALIGN (x
) = MAX (DECL_ALIGN (x
),
5648 TYPE_ALIGN (TREE_TYPE (x
)));
5652 else if (TREE_TYPE (x
) != error_mark_node
)
5654 unsigned int min_align
= (DECL_PACKED (x
) ? BITS_PER_UNIT
5655 : TYPE_ALIGN (TREE_TYPE (x
)));
5656 /* Non-bit-fields are aligned for their type, except packed
5657 fields which require only BITS_PER_UNIT alignment. */
5658 DECL_ALIGN (x
) = MAX (DECL_ALIGN (x
), min_align
);
5662 /* Now DECL_INITIAL is null on all members. */
5664 /* Delete all duplicate fields from the fieldlist */
5665 for (x
= fieldlist
; x
&& TREE_CHAIN (x
);)
5666 /* Anonymous fields aren't duplicates. */
5667 if (DECL_NAME (TREE_CHAIN (x
)) == 0)
5671 register tree y
= fieldlist
;
5675 if (DECL_NAME (y
) == DECL_NAME (TREE_CHAIN (x
)))
5681 if (DECL_NAME (y
) == DECL_NAME (TREE_CHAIN (x
)))
5683 error_with_decl (TREE_CHAIN (x
), "duplicate member `%s'");
5684 TREE_CHAIN (x
) = TREE_CHAIN (TREE_CHAIN (x
));
5686 else x
= TREE_CHAIN (x
);
5689 /* Now we have the nearly final fieldlist. Record it,
5690 then lay out the structure or union (including the fields). */
5692 TYPE_FIELDS (t
) = fieldlist
;
5696 /* Delete all zero-width bit-fields from the front of the fieldlist */
5698 && DECL_INITIAL (fieldlist
))
5699 fieldlist
= TREE_CHAIN (fieldlist
);
5700 /* Delete all such members from the rest of the fieldlist */
5701 for (x
= fieldlist
; x
;)
5703 if (TREE_CHAIN (x
) && DECL_INITIAL (TREE_CHAIN (x
)))
5704 TREE_CHAIN (x
) = TREE_CHAIN (TREE_CHAIN (x
));
5705 else x
= TREE_CHAIN (x
);
5708 /* Now we have the truly final field list.
5709 Store it in this type and in the variants. */
5711 TYPE_FIELDS (t
) = fieldlist
;
5713 /* If there are lots of fields, sort so we can look through them fast.
5714 We arbitrarily consider 16 or more elts to be "a lot". */
5718 for (x
= fieldlist
; x
; x
= TREE_CHAIN (x
))
5729 len
+= list_length (x
);
5730 /* Use the same allocation policy here that make_node uses, to
5731 ensure that this lives as long as the rest of the struct decl.
5732 All decls in an inline function need to be saved. */
5733 if (allocation_temporary_p ())
5734 space
= savealloc (sizeof (struct lang_type
) + len
* sizeof (tree
));
5736 space
= oballoc (sizeof (struct lang_type
) + len
* sizeof (tree
));
5738 TYPE_LANG_SPECIFIC (t
) = (struct lang_type
*) space
;
5739 TYPE_LANG_SPECIFIC (t
)->len
= len
;
5741 field_array
= &TYPE_LANG_SPECIFIC (t
)->elts
[0];
5743 for (x
= fieldlist
; x
; x
= TREE_CHAIN (x
))
5744 field_array
[len
++] = x
;
5746 qsort (field_array
, len
, sizeof (tree
), field_decl_cmp
);
5750 for (x
= TYPE_MAIN_VARIANT (t
); x
; x
= TYPE_NEXT_VARIANT (x
))
5752 TYPE_FIELDS (x
) = TYPE_FIELDS (t
);
5753 TYPE_LANG_SPECIFIC (x
) = TYPE_LANG_SPECIFIC (t
);
5754 TYPE_ALIGN (x
) = TYPE_ALIGN (t
);
5757 /* If this was supposed to be a transparent union, but we can't
5758 make it one, warn and turn off the flag. */
5759 if (TREE_CODE (t
) == UNION_TYPE
5760 && TYPE_TRANSPARENT_UNION (t
)
5761 && TYPE_MODE (t
) != DECL_MODE (TYPE_FIELDS (t
)))
5763 TYPE_TRANSPARENT_UNION (t
) = 0;
5764 warning ("union cannot be made transparent");
5767 /* If this structure or union completes the type of any previous
5768 variable declaration, lay it out and output its rtl. */
5770 if (current_binding_level
->n_incomplete
!= 0)
5773 for (decl
= current_binding_level
->names
; decl
; decl
= TREE_CHAIN (decl
))
5775 if (TREE_TYPE (decl
) == t
5776 && TREE_CODE (decl
) != TYPE_DECL
)
5778 layout_decl (decl
, 0);
5779 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
5780 maybe_objc_check_decl (decl
);
5781 rest_of_decl_compilation (decl
, NULL_PTR
, toplevel
, 0);
5784 --current_binding_level
->n_incomplete
;
5786 else if (TYPE_SIZE (TREE_TYPE (decl
)) == 0
5787 && TREE_CODE (TREE_TYPE (decl
)) == ARRAY_TYPE
)
5789 tree element
= TREE_TYPE (decl
);
5790 while (TREE_CODE (element
) == ARRAY_TYPE
)
5791 element
= TREE_TYPE (element
);
5793 layout_array_type (TREE_TYPE (decl
));
5798 resume_momentary (old_momentary
);
5800 /* Finish debugging output for this type. */
5801 rest_of_type_compilation (t
, toplevel
);
5803 /* The matching push is in start_struct. */
5809 /* Lay out the type T, and its element type, and so on. */
5812 layout_array_type (t
)
5815 if (TREE_CODE (TREE_TYPE (t
)) == ARRAY_TYPE
)
5816 layout_array_type (TREE_TYPE (t
));
5820 /* Begin compiling the definition of an enumeration type.
5821 NAME is its name (or null if anonymous).
5822 Returns the type object, as yet incomplete.
5823 Also records info about it so that build_enumerator
5824 may be used to declare the individual values as they are read. */
5830 register tree enumtype
= 0;
5832 /* If this is the real definition for a previous forward reference,
5833 fill in the contents in the same object that used to be the
5834 forward reference. */
5837 enumtype
= lookup_tag (ENUMERAL_TYPE
, name
, current_binding_level
, 1);
5839 /* The corresponding pop_obstacks is in finish_enum. */
5840 push_obstacks_nochange ();
5841 /* If these symbols and types are global, make them permanent. */
5842 if (current_binding_level
== global_binding_level
)
5843 end_temporary_allocation ();
5845 if (enumtype
== 0 || TREE_CODE (enumtype
) != ENUMERAL_TYPE
)
5847 enumtype
= make_node (ENUMERAL_TYPE
);
5848 pushtag (name
, enumtype
);
5851 C_TYPE_BEING_DEFINED (enumtype
) = 1;
5853 if (TYPE_VALUES (enumtype
) != 0)
5855 /* This enum is a named one that has been declared already. */
5856 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name
));
5858 /* Completely replace its old definition.
5859 The old enumerators remain defined, however. */
5860 TYPE_VALUES (enumtype
) = 0;
5863 enum_next_value
= integer_zero_node
;
5866 if (flag_short_enums
)
5867 TYPE_PACKED (enumtype
) = 1;
5872 /* After processing and defining all the values of an enumeration type,
5873 install their decls in the enumeration type and finish it off.
5874 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5875 and ATTRIBUTES are the specified attributes.
5876 Returns ENUMTYPE. */
5879 finish_enum (enumtype
, values
, attributes
)
5884 register tree pair
, tem
;
5885 tree minnode
= 0, maxnode
= 0;
5886 int lowprec
, highprec
, precision
;
5887 int toplevel
= global_binding_level
== current_binding_level
;
5889 if (in_parm_level_p ())
5890 warning ("enum defined inside parms");
5892 decl_attributes (enumtype
, attributes
, NULL_TREE
);
5894 /* Calculate the maximum value of any enumerator in this type. */
5896 if (values
== error_mark_node
)
5897 minnode
= maxnode
= integer_zero_node
;
5899 for (pair
= values
; pair
; pair
= TREE_CHAIN (pair
))
5901 tree value
= TREE_VALUE (pair
);
5903 minnode
= maxnode
= TREE_VALUE (pair
);
5906 if (tree_int_cst_lt (maxnode
, value
))
5908 if (tree_int_cst_lt (value
, minnode
))
5913 TYPE_MIN_VALUE (enumtype
) = minnode
;
5914 TYPE_MAX_VALUE (enumtype
) = maxnode
;
5916 /* An enum can have some negative values; then it is signed. */
5917 TREE_UNSIGNED (enumtype
) = tree_int_cst_sgn (minnode
) >= 0;
5919 /* Determine the precision this type needs. */
5921 lowprec
= min_precision (minnode
, TREE_UNSIGNED (enumtype
));
5922 highprec
= min_precision (maxnode
, TREE_UNSIGNED (enumtype
));
5923 precision
= MAX (lowprec
, highprec
);
5925 if (TYPE_PACKED (enumtype
) || precision
> TYPE_PRECISION (integer_type_node
))
5927 tree narrowest
= type_for_size (precision
, 1);
5930 warning ("enumeration values exceed range of largest integer");
5931 narrowest
= long_long_integer_type_node
;
5934 TYPE_PRECISION (enumtype
) = TYPE_PRECISION (narrowest
);
5937 TYPE_PRECISION (enumtype
) = TYPE_PRECISION (integer_type_node
);
5939 TYPE_SIZE (enumtype
) = 0;
5940 layout_type (enumtype
);
5942 if (values
!= error_mark_node
)
5944 /* Change the type of the enumerators to be the enum type.
5945 Formerly this was done only for enums that fit in an int,
5946 but the comment said it was done only for enums wider than int.
5947 It seems necessary to do this for wide enums,
5948 and best not to change what's done for ordinary narrower ones. */
5949 for (pair
= values
; pair
; pair
= TREE_CHAIN (pair
))
5951 TREE_TYPE (TREE_PURPOSE (pair
)) = enumtype
;
5952 DECL_SIZE (TREE_PURPOSE (pair
)) = TYPE_SIZE (enumtype
);
5953 if (TREE_CODE (TREE_PURPOSE (pair
)) != FUNCTION_DECL
)
5954 DECL_ALIGN (TREE_PURPOSE (pair
)) = TYPE_ALIGN (enumtype
);
5957 /* Replace the decl nodes in VALUES with their names. */
5958 for (pair
= values
; pair
; pair
= TREE_CHAIN (pair
))
5959 TREE_PURPOSE (pair
) = DECL_NAME (TREE_PURPOSE (pair
));
5961 TYPE_VALUES (enumtype
) = values
;
5964 /* Fix up all variant types of this enum type. */
5965 for (tem
= TYPE_MAIN_VARIANT (enumtype
); tem
; tem
= TYPE_NEXT_VARIANT (tem
))
5967 TYPE_VALUES (tem
) = TYPE_VALUES (enumtype
);
5968 TYPE_MIN_VALUE (tem
) = TYPE_MIN_VALUE (enumtype
);
5969 TYPE_MAX_VALUE (tem
) = TYPE_MAX_VALUE (enumtype
);
5970 TYPE_SIZE (tem
) = TYPE_SIZE (enumtype
);
5971 TYPE_SIZE_UNIT (tem
) = TYPE_SIZE_UNIT (enumtype
);
5972 TYPE_MODE (tem
) = TYPE_MODE (enumtype
);
5973 TYPE_PRECISION (tem
) = TYPE_PRECISION (enumtype
);
5974 TYPE_ALIGN (tem
) = TYPE_ALIGN (enumtype
);
5975 TREE_UNSIGNED (tem
) = TREE_UNSIGNED (enumtype
);
5978 /* Finish debugging output for this type. */
5979 rest_of_type_compilation (enumtype
, toplevel
);
5981 /* This matches a push in start_enum. */
5987 /* Build and install a CONST_DECL for one value of the
5988 current enumeration type (one that was begun with start_enum).
5989 Return a tree-list containing the CONST_DECL and its value.
5990 Assignment of sequential values by default is handled here. */
5993 build_enumerator (name
, value
)
5996 register tree decl
, type
;
5998 /* Validate and default VALUE. */
6000 /* Remove no-op casts from the value. */
6002 STRIP_TYPE_NOPS (value
);
6006 if (TREE_CODE (value
) == INTEGER_CST
)
6008 value
= default_conversion (value
);
6009 constant_expression_warning (value
);
6013 error ("enumerator value for `%s' not integer constant",
6014 IDENTIFIER_POINTER (name
));
6019 /* Default based on previous value. */
6020 /* It should no longer be possible to have NON_LVALUE_EXPR
6024 value
= enum_next_value
;
6026 error ("overflow in enumeration values");
6029 if (pedantic
&& ! int_fits_type_p (value
, integer_type_node
))
6031 pedwarn ("ANSI C restricts enumerator values to range of `int'");
6032 value
= integer_zero_node
;
6035 /* Set basis for default for next value. */
6036 enum_next_value
= build_binary_op (PLUS_EXPR
, value
, integer_one_node
, 0);
6037 enum_overflow
= tree_int_cst_lt (enum_next_value
, value
);
6039 /* Now create a declaration for the enum value name. */
6041 type
= TREE_TYPE (value
);
6042 type
= type_for_size (MAX (TYPE_PRECISION (type
),
6043 TYPE_PRECISION (integer_type_node
)),
6045 || TYPE_PRECISION (type
) >= TYPE_PRECISION (integer_type_node
))
6046 && TREE_UNSIGNED (type
)));
6048 decl
= build_decl (CONST_DECL
, name
, type
);
6049 DECL_INITIAL (decl
) = value
;
6050 TREE_TYPE (value
) = type
;
6053 return saveable_tree_cons (decl
, value
, NULL_TREE
);
6056 /* Create the FUNCTION_DECL for a function definition.
6057 DECLSPECS, DECLARATOR, PREFIX_ATTRIBUTES and ATTRIBUTES are the parts of
6058 the declaration; they describe the function's name and the type it returns,
6059 but twisted together in a fashion that parallels the syntax of C.
6061 This function creates a binding context for the function body
6062 as well as setting up the FUNCTION_DECL in current_function_decl.
6064 Returns 1 on success. If the DECLARATOR is not suitable for a function
6065 (it defines a datum instead), we return 0, which tells
6066 yyparse to report a parse error.
6068 NESTED is nonzero for a function nested within another function. */
6071 start_function (declspecs
, declarator
, prefix_attributes
, attributes
, nested
)
6072 tree declarator
, declspecs
, prefix_attributes
, attributes
;
6075 tree decl1
, old_decl
;
6077 int old_immediate_size_expand
= immediate_size_expand
;
6079 current_function_returns_value
= 0; /* Assume, until we see it does. */
6080 current_function_returns_null
= 0;
6081 warn_about_return_type
= 0;
6082 current_extern_inline
= 0;
6083 c_function_varargs
= 0;
6085 shadowed_labels
= 0;
6087 /* Don't expand any sizes in the return type of the function. */
6088 immediate_size_expand
= 0;
6090 decl1
= grokdeclarator (declarator
, declspecs
, FUNCDEF
, 1);
6092 /* If the declarator is not suitable for a function definition,
6093 cause a syntax error. */
6096 immediate_size_expand
= old_immediate_size_expand
;
6100 decl_attributes (decl1
, prefix_attributes
, attributes
);
6102 announce_function (decl1
);
6104 if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl1
))) == 0)
6106 error ("return-type is an incomplete type");
6107 /* Make it return void instead. */
6109 = build_function_type (void_type_node
,
6110 TYPE_ARG_TYPES (TREE_TYPE (decl1
)));
6113 if (warn_about_return_type
)
6114 warning ("return-type defaults to `int'");
6116 /* Save the parm names or decls from this function's declarator
6117 where store_parm_decls will find them. */
6118 current_function_parms
= last_function_parms
;
6119 current_function_parm_tags
= last_function_parm_tags
;
6121 /* Make the init_value nonzero so pushdecl knows this is not tentative.
6122 error_mark_node is replaced below (in poplevel) with the BLOCK. */
6123 DECL_INITIAL (decl1
) = error_mark_node
;
6125 /* If this definition isn't a prototype and we had a prototype declaration
6126 before, copy the arg type info from that prototype.
6127 But not if what we had before was a builtin function. */
6128 old_decl
= lookup_name_current_level (DECL_NAME (decl1
));
6129 if (old_decl
!= 0 && TREE_CODE (TREE_TYPE (old_decl
)) == FUNCTION_TYPE
6130 && !DECL_BUILT_IN (old_decl
)
6131 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1
)))
6132 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl
))))
6133 && TYPE_ARG_TYPES (TREE_TYPE (decl1
)) == 0)
6135 TREE_TYPE (decl1
) = TREE_TYPE (old_decl
);
6136 current_function_prototype_file
= DECL_SOURCE_FILE (old_decl
);
6137 current_function_prototype_line
= DECL_SOURCE_LINE (old_decl
);
6140 /* If there is no explicit declaration, look for any out-of-scope implicit
6143 old_decl
= IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1
));
6145 /* Optionally warn of old-fashioned def with no previous prototype. */
6146 if (warn_strict_prototypes
6147 && TYPE_ARG_TYPES (TREE_TYPE (decl1
)) == 0
6148 && !(old_decl
!= 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl
)) != 0))
6149 warning ("function declaration isn't a prototype");
6150 /* Optionally warn of any global def with no previous prototype. */
6151 else if (warn_missing_prototypes
6152 && TREE_PUBLIC (decl1
)
6153 && !(old_decl
!= 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl
)) != 0)
6154 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1
))))
6155 warning_with_decl (decl1
, "no previous prototype for `%s'");
6156 /* Optionally warn of any def with no previous prototype
6157 if the function has already been used. */
6158 else if (warn_missing_prototypes
6159 && old_decl
!= 0 && TREE_USED (old_decl
)
6160 && TYPE_ARG_TYPES (TREE_TYPE (old_decl
)) == 0)
6161 warning_with_decl (decl1
,
6162 "`%s' was used with no prototype before its definition");
6163 /* Optionally warn of any global def with no previous declaration. */
6164 else if (warn_missing_declarations
6165 && TREE_PUBLIC (decl1
)
6167 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1
))))
6168 warning_with_decl (decl1
, "no previous declaration for `%s'");
6169 /* Optionally warn of any def with no previous declaration
6170 if the function has already been used. */
6171 else if (warn_missing_declarations
6172 && old_decl
!= 0 && TREE_USED (old_decl
)
6173 && old_decl
== IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1
)))
6174 warning_with_decl (decl1
,
6175 "`%s' was used with no declaration before its definition");
6177 /* This is a definition, not a reference.
6178 So normally clear DECL_EXTERNAL.
6179 However, `extern inline' acts like a declaration
6180 except for defining how to inline. So set DECL_EXTERNAL in that case. */
6181 DECL_EXTERNAL (decl1
) = current_extern_inline
;
6183 #ifdef SET_DEFAULT_DECL_ATTRIBUTES
6184 SET_DEFAULT_DECL_ATTRIBUTES (decl1
, attributes
);
6187 /* This function exists in static storage.
6188 (This does not mean `static' in the C sense!) */
6189 TREE_STATIC (decl1
) = 1;
6191 /* A nested function is not global. */
6192 if (current_function_decl
!= 0)
6193 TREE_PUBLIC (decl1
) = 0;
6195 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
6197 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1
))) == 0)
6202 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1
)))
6203 != integer_type_node
)
6204 pedwarn_with_decl (decl1
, "return type of `%s' is not `int'");
6206 for (args
= TYPE_ARG_TYPES (TREE_TYPE (decl1
)); args
;
6207 args
= TREE_CHAIN (args
))
6209 tree type
= args
? TREE_VALUE (args
) : 0;
6211 if (type
== void_type_node
)
6218 if (TYPE_MAIN_VARIANT (type
) != integer_type_node
)
6219 pedwarn_with_decl (decl1
,
6220 "first argument of `%s' should be `int'");
6224 if (TREE_CODE (type
) != POINTER_TYPE
6225 || TREE_CODE (TREE_TYPE (type
)) != POINTER_TYPE
6226 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type
)))
6228 pedwarn_with_decl (decl1
,
6229 "second argument of `%s' should be `char **'");
6233 if (TREE_CODE (type
) != POINTER_TYPE
6234 || TREE_CODE (TREE_TYPE (type
)) != POINTER_TYPE
6235 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type
)))
6237 pedwarn_with_decl (decl1
,
6238 "third argument of `%s' should probably be `char **'");
6243 /* It is intentional that this message does not mention the third
6244 argument, which is warned for only pedantically, because it's
6245 blessed by mention in an appendix of the standard. */
6246 if (argct
> 0 && (argct
< 2 || argct
> 3))
6247 pedwarn_with_decl (decl1
, "`%s' takes only zero or two arguments");
6249 if (argct
== 3 && pedantic
)
6250 pedwarn_with_decl (decl1
, "third argument of `%s' is deprecated");
6252 if (! TREE_PUBLIC (decl1
))
6253 pedwarn_with_decl (decl1
, "`%s' is normally a non-static function");
6256 /* Record the decl so that the function name is defined.
6257 If we already have a decl for this name, and it is a FUNCTION_DECL,
6258 use the old decl. */
6260 current_function_decl
= pushdecl (decl1
);
6263 declare_parm_level (1);
6264 current_binding_level
->subblocks_tag_transparent
= 1;
6266 make_function_rtl (current_function_decl
);
6268 restype
= TREE_TYPE (TREE_TYPE (current_function_decl
));
6269 /* Promote the value to int before returning it. */
6270 if (C_PROMOTING_INTEGER_TYPE_P (restype
))
6272 /* It retains unsignedness if traditional
6273 or if not really getting wider. */
6274 if (TREE_UNSIGNED (restype
)
6275 && (flag_traditional
6276 || (TYPE_PRECISION (restype
)
6277 == TYPE_PRECISION (integer_type_node
))))
6278 restype
= unsigned_type_node
;
6280 restype
= integer_type_node
;
6282 DECL_RESULT (current_function_decl
)
6283 = build_decl (RESULT_DECL
, NULL_TREE
, restype
);
6286 /* Allocate further tree nodes temporarily during compilation
6287 of this function only. */
6288 temporary_allocation ();
6290 /* If this fcn was already referenced via a block-scope `extern' decl
6291 (or an implicit decl), propagate certain information about the usage. */
6292 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl
)))
6293 TREE_ADDRESSABLE (current_function_decl
) = 1;
6295 immediate_size_expand
= old_immediate_size_expand
;
6300 /* Record that this function is going to be a varargs function.
6301 This is called before store_parm_decls, which is too early
6302 to call mark_varargs directly. */
6307 c_function_varargs
= 1;
6310 /* Store the parameter declarations into the current function declaration.
6311 This is called after parsing the parameter declarations, before
6312 digesting the body of the function.
6314 For an old-style definition, modify the function's type
6315 to specify at least the number of arguments. */
6320 register tree fndecl
= current_function_decl
;
6323 /* This is either a chain of PARM_DECLs (if a prototype was used)
6324 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
6325 tree specparms
= current_function_parms
;
6327 /* This is a list of types declared among parms in a prototype. */
6328 tree parmtags
= current_function_parm_tags
;
6330 /* This is a chain of PARM_DECLs from old-style parm declarations. */
6331 register tree parmdecls
= getdecls ();
6333 /* This is a chain of any other decls that came in among the parm
6334 declarations. If a parm is declared with enum {foo, bar} x;
6335 then CONST_DECLs for foo and bar are put here. */
6338 /* Nonzero if this definition is written with a prototype. */
6341 if (specparms
!= 0 && TREE_CODE (specparms
) != TREE_LIST
)
6343 /* This case is when the function was defined with an ANSI prototype.
6344 The parms already have decls, so we need not do anything here
6345 except record them as in effect
6346 and complain if any redundant old-style parm decls were written. */
6357 error_with_decl (fndecl
,
6358 "parm types given both in parmlist and separately");
6359 /* Get rid of the erroneous decls; don't keep them on
6360 the list of parms, since they might not be PARM_DECLs. */
6361 for (decl
= current_binding_level
->names
;
6362 decl
; decl
= TREE_CHAIN (decl
))
6363 if (DECL_NAME (decl
))
6364 IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl
)) = 0;
6365 for (link
= current_binding_level
->shadowed
;
6366 link
; link
= TREE_CHAIN (link
))
6367 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link
)) = TREE_VALUE (link
);
6368 current_binding_level
->names
= 0;
6369 current_binding_level
->shadowed
= 0;
6372 specparms
= nreverse (specparms
);
6373 for (parm
= specparms
; parm
; parm
= next
)
6375 next
= TREE_CHAIN (parm
);
6376 if (TREE_CODE (parm
) == PARM_DECL
)
6378 if (DECL_NAME (parm
) == 0)
6379 error_with_decl (parm
, "parameter name omitted");
6380 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm
)) == void_type_node
)
6382 error_with_decl (parm
, "parameter `%s' declared void");
6383 /* Change the type to error_mark_node so this parameter
6384 will be ignored by assign_parms. */
6385 TREE_TYPE (parm
) = error_mark_node
;
6391 /* If we find an enum constant or a type tag,
6392 put it aside for the moment. */
6393 TREE_CHAIN (parm
) = 0;
6394 others
= chainon (others
, parm
);
6398 /* Get the decls in their original chain order
6399 and record in the function. */
6400 DECL_ARGUMENTS (fndecl
) = getdecls ();
6403 /* If this function takes a variable number of arguments,
6404 add a phony parameter to the end of the parm list,
6405 to represent the position of the first unnamed argument. */
6406 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl
))))
6409 tree dummy
= build_decl (PARM_DECL
, NULL_TREE
, void_type_node
);
6410 /* Let's hope the address of the unnamed parm
6411 won't depend on its type. */
6412 TREE_TYPE (dummy
) = integer_type_node
;
6413 DECL_ARG_TYPE (dummy
) = integer_type_node
;
6414 DECL_ARGUMENTS (fndecl
)
6415 = chainon (DECL_ARGUMENTS (fndecl
), dummy
);
6419 /* Now pushdecl the enum constants. */
6420 for (parm
= others
; parm
; parm
= next
)
6422 next
= TREE_CHAIN (parm
);
6423 if (DECL_NAME (parm
) == 0)
6425 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm
)) == void_type_node
)
6427 else if (TREE_CODE (parm
) != PARM_DECL
)
6431 storetags (chainon (parmtags
, gettags ()));
6435 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6436 each with a parm name as the TREE_VALUE.
6438 PARMDECLS is a chain of declarations for parameters.
6439 Warning! It can also contain CONST_DECLs which are not parameters
6440 but are names of enumerators of any enum types
6441 declared among the parameters.
6443 First match each formal parameter name with its declaration.
6444 Associate decls with the names and store the decls
6445 into the TREE_PURPOSE slots. */
6447 for (parm
= parmdecls
; parm
; parm
= TREE_CHAIN (parm
))
6448 DECL_RESULT (parm
) = 0;
6450 for (parm
= specparms
; parm
; parm
= TREE_CHAIN (parm
))
6452 register tree tail
, found
= NULL
;
6454 if (TREE_VALUE (parm
) == 0)
6456 error_with_decl (fndecl
, "parameter name missing from parameter list");
6457 TREE_PURPOSE (parm
) = 0;
6461 /* See if any of the parmdecls specifies this parm by name.
6462 Ignore any enumerator decls. */
6463 for (tail
= parmdecls
; tail
; tail
= TREE_CHAIN (tail
))
6464 if (DECL_NAME (tail
) == TREE_VALUE (parm
)
6465 && TREE_CODE (tail
) == PARM_DECL
)
6471 /* If declaration already marked, we have a duplicate name.
6472 Complain, and don't use this decl twice. */
6473 if (found
&& DECL_RESULT (found
) != 0)
6475 error_with_decl (found
, "multiple parameters named `%s'");
6479 /* If the declaration says "void", complain and ignore it. */
6480 if (found
&& TYPE_MAIN_VARIANT (TREE_TYPE (found
)) == void_type_node
)
6482 error_with_decl (found
, "parameter `%s' declared void");
6483 TREE_TYPE (found
) = integer_type_node
;
6484 DECL_ARG_TYPE (found
) = integer_type_node
;
6485 layout_decl (found
, 0);
6488 /* Traditionally, a parm declared float is actually a double. */
6489 if (found
&& flag_traditional
6490 && TYPE_MAIN_VARIANT (TREE_TYPE (found
)) == float_type_node
)
6492 TREE_TYPE (found
) = double_type_node
;
6493 DECL_ARG_TYPE (found
) = double_type_node
;
6494 layout_decl (found
, 0);
6497 /* If no declaration found, default to int. */
6500 found
= build_decl (PARM_DECL
, TREE_VALUE (parm
),
6502 DECL_ARG_TYPE (found
) = TREE_TYPE (found
);
6503 DECL_SOURCE_LINE (found
) = DECL_SOURCE_LINE (fndecl
);
6504 DECL_SOURCE_FILE (found
) = DECL_SOURCE_FILE (fndecl
);
6506 warning_with_decl (found
, "type of `%s' defaults to `int'");
6510 TREE_PURPOSE (parm
) = found
;
6512 /* Mark this decl as "already found" -- see test, above.
6513 It is safe to use DECL_RESULT for this
6514 since it is not used in PARM_DECLs or CONST_DECLs. */
6515 DECL_RESULT (found
) = error_mark_node
;
6518 /* Put anything which is on the parmdecls chain and which is
6519 not a PARM_DECL onto the list NONPARMS. (The types of
6520 non-parm things which might appear on the list include
6521 enumerators and NULL-named TYPE_DECL nodes.) Complain about
6522 any actual PARM_DECLs not matched with any names. */
6525 for (parm
= parmdecls
; parm
; )
6527 tree next
= TREE_CHAIN (parm
);
6528 TREE_CHAIN (parm
) = 0;
6530 if (TREE_CODE (parm
) != PARM_DECL
)
6531 nonparms
= chainon (nonparms
, parm
);
6534 /* Complain about args with incomplete types. */
6535 if (TYPE_SIZE (TREE_TYPE (parm
)) == 0)
6537 error_with_decl (parm
, "parameter `%s' has incomplete type");
6538 TREE_TYPE (parm
) = error_mark_node
;
6541 if (DECL_RESULT (parm
) == 0)
6543 error_with_decl (parm
,
6544 "declaration for parameter `%s' but no such parameter");
6545 /* Pretend the parameter was not missing.
6546 This gets us to a standard state and minimizes
6547 further error messages. */
6549 = chainon (specparms
,
6550 tree_cons (parm
, NULL_TREE
, NULL_TREE
));
6557 /* Chain the declarations together in the order of the list of names. */
6558 /* Store that chain in the function decl, replacing the list of names. */
6560 DECL_ARGUMENTS (fndecl
) = 0;
6563 for (last
= 0; parm
; parm
= TREE_CHAIN (parm
))
6564 if (TREE_PURPOSE (parm
))
6567 DECL_ARGUMENTS (fndecl
) = TREE_PURPOSE (parm
);
6569 TREE_CHAIN (last
) = TREE_PURPOSE (parm
);
6570 last
= TREE_PURPOSE (parm
);
6571 TREE_CHAIN (last
) = 0;
6575 /* If there was a previous prototype,
6576 set the DECL_ARG_TYPE of each argument according to
6577 the type previously specified, and report any mismatches. */
6579 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl
)))
6582 for (parm
= DECL_ARGUMENTS (fndecl
),
6583 type
= TYPE_ARG_TYPES (TREE_TYPE (fndecl
));
6584 parm
|| (type
&& (TYPE_MAIN_VARIANT (TREE_VALUE (type
))
6585 != void_type_node
));
6586 parm
= TREE_CHAIN (parm
), type
= TREE_CHAIN (type
))
6588 if (parm
== 0 || type
== 0
6589 || TYPE_MAIN_VARIANT (TREE_VALUE (type
)) == void_type_node
)
6591 error ("number of arguments doesn't match prototype");
6592 error_with_file_and_line (current_function_prototype_file
,
6593 current_function_prototype_line
,
6594 "prototype declaration");
6597 /* Type for passing arg must be consistent
6598 with that declared for the arg. */
6599 if (! comptypes (DECL_ARG_TYPE (parm
), TREE_VALUE (type
)))
6601 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm
))
6602 == TYPE_MAIN_VARIANT (TREE_VALUE (type
)))
6604 /* Adjust argument to match prototype. E.g. a previous
6605 `int foo(float);' prototype causes
6606 `int foo(x) float x; {...}' to be treated like
6607 `int foo(float x) {...}'. This is particularly
6608 useful for argument types like uid_t. */
6609 DECL_ARG_TYPE (parm
) = TREE_TYPE (parm
);
6611 if (PROMOTE_PROTOTYPES
6612 && (TREE_CODE (TREE_TYPE (parm
)) == INTEGER_TYPE
6613 || TREE_CODE (TREE_TYPE (parm
)) == ENUMERAL_TYPE
)
6614 && TYPE_PRECISION (TREE_TYPE (parm
))
6615 < TYPE_PRECISION (integer_type_node
))
6616 DECL_ARG_TYPE (parm
) = integer_type_node
;
6620 pedwarn ("promoted argument `%s' doesn't match prototype",
6621 IDENTIFIER_POINTER (DECL_NAME (parm
)));
6622 warning_with_file_and_line
6623 (current_function_prototype_file
,
6624 current_function_prototype_line
,
6625 "prototype declaration");
6628 /* If -traditional, allow `int' argument to match
6629 `unsigned' prototype. */
6630 else if (! (flag_traditional
6631 && TYPE_MAIN_VARIANT (TREE_TYPE (parm
)) == integer_type_node
6632 && TYPE_MAIN_VARIANT (TREE_VALUE (type
)) == unsigned_type_node
))
6634 error ("argument `%s' doesn't match prototype",
6635 IDENTIFIER_POINTER (DECL_NAME (parm
)));
6636 error_with_file_and_line (current_function_prototype_file
,
6637 current_function_prototype_line
,
6638 "prototype declaration");
6642 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl
)) = 0;
6645 /* Otherwise, create a prototype that would match. */
6649 tree actual
= 0, last
= 0, type
;
6651 for (parm
= DECL_ARGUMENTS (fndecl
); parm
; parm
= TREE_CHAIN (parm
))
6653 type
= perm_tree_cons (NULL_TREE
, DECL_ARG_TYPE (parm
),
6656 TREE_CHAIN (last
) = type
;
6661 type
= perm_tree_cons (NULL_TREE
, void_type_node
, NULL_TREE
);
6663 TREE_CHAIN (last
) = type
;
6667 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6668 of the type of this function, but we need to avoid having this
6669 affect the types of other similarly-typed functions, so we must
6670 first force the generation of an identical (but separate) type
6671 node for the relevant function type. The new node we create
6672 will be a variant of the main variant of the original function
6675 TREE_TYPE (fndecl
) = build_type_copy (TREE_TYPE (fndecl
));
6677 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl
)) = actual
;
6680 /* Now store the final chain of decls for the arguments
6681 as the decl-chain of the current lexical scope.
6682 Put the enumerators in as well, at the front so that
6683 DECL_ARGUMENTS is not modified. */
6685 storedecls (chainon (nonparms
, DECL_ARGUMENTS (fndecl
)));
6688 /* Make sure the binding level for the top of the function body
6689 gets a BLOCK if there are any in the function.
6690 Otherwise, the dbx output is wrong. */
6692 keep_next_if_subblocks
= 1;
6694 /* ??? This might be an improvement,
6695 but needs to be thought about some more. */
6697 keep_next_level_flag
= 1;
6700 /* Write a record describing this function definition to the prototypes
6701 file (if requested). */
6703 gen_aux_info_record (fndecl
, 1, 0, prototype
);
6705 /* Initialize the RTL code for the function. */
6707 init_function_start (fndecl
, input_filename
, lineno
);
6709 /* If this is a varargs function, inform function.c. */
6711 if (c_function_varargs
)
6714 /* Declare __FUNCTION__ and __PRETTY_FUNCTION__ for this function. */
6716 declare_function_name ();
6718 /* Set up parameters and prepare for return, for the function. */
6720 expand_function_start (fndecl
, 0);
6722 /* If this function is `main', emit a call to `__main'
6723 to run global initializers, etc. */
6724 if (DECL_NAME (fndecl
)
6725 && strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl
)), "main") == 0
6726 && DECL_CONTEXT (fndecl
) == NULL_TREE
)
6727 expand_main_function ();
6730 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6731 each with a parm name as the TREE_VALUE. A null pointer as TREE_VALUE
6732 stands for an ellipsis in the identifier list.
6734 PARMLIST is the data returned by get_parm_info for the
6735 parmlist that follows the semicolon.
6737 We return a value of the same sort that get_parm_info returns,
6738 except that it describes the combination of identifiers and parmlist. */
6741 combine_parm_decls (specparms
, parmlist
, void_at_end
)
6742 tree specparms
, parmlist
;
6745 register tree fndecl
= current_function_decl
;
6748 tree parmdecls
= TREE_PURPOSE (parmlist
);
6750 /* This is a chain of any other decls that came in among the parm
6751 declarations. They were separated already by get_parm_info,
6752 so we just need to keep them separate. */
6753 tree nonparms
= TREE_VALUE (parmlist
);
6757 for (parm
= parmdecls
; parm
; parm
= TREE_CHAIN (parm
))
6758 DECL_RESULT (parm
) = 0;
6760 for (parm
= specparms
; parm
; parm
= TREE_CHAIN (parm
))
6762 register tree tail
, found
= NULL
;
6764 /* See if any of the parmdecls specifies this parm by name. */
6765 for (tail
= parmdecls
; tail
; tail
= TREE_CHAIN (tail
))
6766 if (DECL_NAME (tail
) == TREE_VALUE (parm
))
6772 /* If declaration already marked, we have a duplicate name.
6773 Complain, and don't use this decl twice. */
6774 if (found
&& DECL_RESULT (found
) != 0)
6776 error_with_decl (found
, "multiple parameters named `%s'");
6780 /* If the declaration says "void", complain and ignore it. */
6781 if (found
&& TYPE_MAIN_VARIANT (TREE_TYPE (found
)) == void_type_node
)
6783 error_with_decl (found
, "parameter `%s' declared void");
6784 TREE_TYPE (found
) = integer_type_node
;
6785 DECL_ARG_TYPE (found
) = integer_type_node
;
6786 layout_decl (found
, 0);
6789 /* Traditionally, a parm declared float is actually a double. */
6790 if (found
&& flag_traditional
6791 && TYPE_MAIN_VARIANT (TREE_TYPE (found
)) == float_type_node
)
6793 TREE_TYPE (found
) = double_type_node
;
6794 DECL_ARG_TYPE (found
) = double_type_node
;
6795 layout_decl (found
, 0);
6798 /* If no declaration found, default to int. */
6801 found
= build_decl (PARM_DECL
, TREE_VALUE (parm
),
6803 DECL_ARG_TYPE (found
) = TREE_TYPE (found
);
6804 DECL_SOURCE_LINE (found
) = DECL_SOURCE_LINE (fndecl
);
6805 DECL_SOURCE_FILE (found
) = DECL_SOURCE_FILE (fndecl
);
6806 error_with_decl (found
, "type of parameter `%s' is not declared");
6810 TREE_PURPOSE (parm
) = found
;
6812 /* Mark this decl as "already found" -- see test, above.
6813 It is safe to use DECL_RESULT for this
6814 since it is not used in PARM_DECLs or CONST_DECLs. */
6815 DECL_RESULT (found
) = error_mark_node
;
6818 /* Complain about any actual PARM_DECLs not matched with any names. */
6820 for (parm
= parmdecls
; parm
; )
6822 tree next
= TREE_CHAIN (parm
);
6823 TREE_CHAIN (parm
) = 0;
6825 /* Complain about args with incomplete types. */
6826 if (TYPE_SIZE (TREE_TYPE (parm
)) == 0)
6828 error_with_decl (parm
, "parameter `%s' has incomplete type");
6829 TREE_TYPE (parm
) = error_mark_node
;
6832 if (DECL_RESULT (parm
) == 0)
6834 error_with_decl (parm
,
6835 "declaration for parameter `%s' but no such parameter");
6836 /* Pretend the parameter was not missing.
6837 This gets us to a standard state and minimizes
6838 further error messages. */
6840 = chainon (specparms
,
6841 tree_cons (parm
, NULL_TREE
, NULL_TREE
));
6847 /* Chain the declarations together in the order of the list of names.
6848 At the same time, build up a list of their types, in reverse order. */
6854 for (last
= 0; parm
; parm
= TREE_CHAIN (parm
))
6855 if (TREE_PURPOSE (parm
))
6858 parmdecls
= TREE_PURPOSE (parm
);
6860 TREE_CHAIN (last
) = TREE_PURPOSE (parm
);
6861 last
= TREE_PURPOSE (parm
);
6862 TREE_CHAIN (last
) = 0;
6864 types
= saveable_tree_cons (NULL_TREE
, TREE_TYPE (parm
), types
);
6869 return saveable_tree_cons (parmdecls
, nonparms
,
6870 nreverse (saveable_tree_cons (NULL_TREE
,
6874 return saveable_tree_cons (parmdecls
, nonparms
, nreverse (types
));
6877 /* Finish up a function declaration and compile that function
6878 all the way to assembler language output. The free the storage
6879 for the function definition.
6881 This is called after parsing the body of the function definition.
6883 NESTED is nonzero if the function being finished is nested in another. */
6886 finish_function (nested
)
6889 register tree fndecl
= current_function_decl
;
6891 /* TREE_READONLY (fndecl) = 1;
6892 This caused &foo to be of type ptr-to-const-function
6893 which then got a warning when stored in a ptr-to-function variable. */
6896 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl
)) = fndecl
;
6898 /* Must mark the RESULT_DECL as being in this function. */
6900 DECL_CONTEXT (DECL_RESULT (fndecl
)) = fndecl
;
6902 /* Obey `register' declarations if `setjmp' is called in this fn. */
6903 if (flag_traditional
&& current_function_calls_setjmp
)
6905 setjmp_protect (DECL_INITIAL (fndecl
));
6906 setjmp_protect_args ();
6909 if (! strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl
)), "main"))
6911 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl
)))
6912 != integer_type_node
)
6914 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6915 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6917 pedwarn_with_decl (fndecl
, "return type of `%s' is not `int'");
6921 #ifdef DEFAULT_MAIN_RETURN
6922 /* Make it so that `main' always returns success by default. */
6923 DEFAULT_MAIN_RETURN
;
6928 /* Generate rtl for function exit. */
6929 expand_function_end (input_filename
, lineno
, 0);
6931 /* So we can tell if jump_optimize sets it to 1. */
6934 /* Run the optimizers and output the assembler code for this function. */
6935 rest_of_compilation (fndecl
);
6937 current_function_returns_null
|= can_reach_end
;
6939 if (warn_missing_noreturn
6940 && !TREE_THIS_VOLATILE (fndecl
)
6941 && !current_function_returns_null
6942 && !current_function_returns_value
)
6943 warning ("function might be possible candidate for attribute `noreturn'");
6945 if (TREE_THIS_VOLATILE (fndecl
) && current_function_returns_null
)
6946 warning ("`noreturn' function does return");
6947 else if (warn_return_type
&& can_reach_end
6948 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl
))) != void_type_node
)
6949 /* If this function returns non-void and control can drop through,
6951 warning ("control reaches end of non-void function");
6952 /* With just -W, complain only if function returns both with
6953 and without a value. */
6954 else if (extra_warnings
6955 && current_function_returns_value
&& current_function_returns_null
)
6956 warning ("this function may return with or without a value");
6958 /* If requested, warn about function definitions where the function will
6959 return a value (usually of some struct or union type) which itself will
6960 take up a lot of stack space. */
6962 if (warn_larger_than
&& !DECL_EXTERNAL (fndecl
) && TREE_TYPE (fndecl
))
6964 register tree ret_type
= TREE_TYPE (TREE_TYPE (fndecl
));
6968 register tree ret_type_size
= TYPE_SIZE (ret_type
);
6970 if (TREE_CODE (ret_type_size
) == INTEGER_CST
)
6973 = TREE_INT_CST_LOW (ret_type_size
) / BITS_PER_UNIT
;
6975 if (units
> larger_than_size
)
6976 warning_with_decl (fndecl
,
6977 "size of return value of `%s' is %u bytes",
6983 /* Free all the tree nodes making up this function. */
6984 /* Switch back to allocating nodes permanently
6985 until we start another function. */
6987 permanent_allocation (1);
6989 if (DECL_SAVED_INSNS (fndecl
) == 0 && ! nested
)
6991 /* Stop pointing to the local nodes about to be freed. */
6992 /* But DECL_INITIAL must remain nonzero so we know this
6993 was an actual function definition. */
6994 /* For a nested function, this is done in pop_c_function_context. */
6995 /* If rest_of_compilation set this to 0, leave it 0. */
6996 if (DECL_INITIAL (fndecl
) != 0)
6997 DECL_INITIAL (fndecl
) = error_mark_node
;
6998 DECL_ARGUMENTS (fndecl
) = 0;
7001 if (DECL_STATIC_CONSTRUCTOR (fndecl
))
7003 #ifndef ASM_OUTPUT_CONSTRUCTOR
7004 if (! flag_gnu_linker
)
7005 static_ctors
= perm_tree_cons (NULL_TREE
, fndecl
, static_ctors
);
7008 assemble_constructor (IDENTIFIER_POINTER (DECL_NAME (fndecl
)));
7010 if (DECL_STATIC_DESTRUCTOR (fndecl
))
7012 #ifndef ASM_OUTPUT_DESTRUCTOR
7013 if (! flag_gnu_linker
)
7014 static_dtors
= perm_tree_cons (NULL_TREE
, fndecl
, static_dtors
);
7017 assemble_destructor (IDENTIFIER_POINTER (DECL_NAME (fndecl
)));
7022 /* Let the error reporting routines know that we're outside a
7023 function. For a nested function, this value is used in
7024 pop_c_function_context and then reset via pop_function_context. */
7025 current_function_decl
= NULL
;
7029 /* Save and restore the variables in this file and elsewhere
7030 that keep track of the progress of compilation of the current function.
7031 Used for nested functions. */
7033 struct language_function
7036 tree shadowed_labels
;
7039 int warn_about_return_type
;
7041 struct binding_level
*binding_level
;
7044 /* Save and reinitialize the variables
7045 used during compilation of a C function. */
7048 push_c_function_context (f
)
7051 struct language_function
*p
;
7052 p
= (struct language_function
*) xmalloc (sizeof (struct language_function
));
7055 p
->named_labels
= named_labels
;
7056 p
->shadowed_labels
= shadowed_labels
;
7057 p
->returns_value
= current_function_returns_value
;
7058 p
->returns_null
= current_function_returns_null
;
7059 p
->warn_about_return_type
= warn_about_return_type
;
7060 p
->extern_inline
= current_extern_inline
;
7061 p
->binding_level
= current_binding_level
;
7064 /* Restore the variables used during compilation of a C function. */
7067 pop_c_function_context (f
)
7070 struct language_function
*p
= f
->language
;
7073 /* Bring back all the labels that were shadowed. */
7074 for (link
= shadowed_labels
; link
; link
= TREE_CHAIN (link
))
7075 if (DECL_NAME (TREE_VALUE (link
)) != 0)
7076 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link
)))
7077 = TREE_VALUE (link
);
7079 if (DECL_SAVED_INSNS (current_function_decl
) == 0)
7081 /* Stop pointing to the local nodes about to be freed. */
7082 /* But DECL_INITIAL must remain nonzero so we know this
7083 was an actual function definition. */
7084 DECL_INITIAL (current_function_decl
) = error_mark_node
;
7085 DECL_ARGUMENTS (current_function_decl
) = 0;
7088 named_labels
= p
->named_labels
;
7089 shadowed_labels
= p
->shadowed_labels
;
7090 current_function_returns_value
= p
->returns_value
;
7091 current_function_returns_null
= p
->returns_null
;
7092 warn_about_return_type
= p
->warn_about_return_type
;
7093 current_extern_inline
= p
->extern_inline
;
7094 current_binding_level
= p
->binding_level
;
7100 /* Mark the language specific parts of F for GC. */
7102 mark_c_function_context (f
)
7105 struct language_function
*p
= f
->language
;
7110 ggc_mark_tree (p
->shadowed_labels
);
7111 ggc_mark_tree (p
->named_labels
);
7112 mark_binding_level (&p
->binding_level
);
7115 /* integrate_decl_tree calls this function, but since we don't use the
7116 DECL_LANG_SPECIFIC field, this is a no-op. */
7119 copy_lang_decl (node
)
7120 tree node ATTRIBUTE_UNUSED
;
7124 /* Mark ARG for GC. */
7126 lang_mark_false_label_stack (arg
)
7127 struct label_node
*arg
;
7129 /* C doesn't use false_label_stack. It better be NULL. */
7134 /* Mark the language specific bits in T for GC. */
7139 if (TREE_CODE (t
) == IDENTIFIER_NODE
)
7141 struct lang_identifier
*i
= (struct lang_identifier
*) t
;
7142 ggc_mark_tree (i
->global_value
);
7143 ggc_mark_tree (i
->local_value
);
7144 ggc_mark_tree (i
->label_value
);
7145 ggc_mark_tree (i
->implicit_decl
);
7146 ggc_mark_tree (i
->error_locus
);
7147 ggc_mark_tree (i
->limbo_value
);
7151 /* Free the language specific bits in T for GC. */
7153 lang_cleanup_tree (t
)
7156 if (TREE_CODE_CLASS (TREE_CODE (t
)) == 't'
7157 && TYPE_LANG_SPECIFIC (t
) != NULL
)
7160 /* This is currently allocated with an obstack. This will change. */
7161 free (TYPE_LANG_SPECIFIC (t
));