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 PTR, const 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 (simple_type_promotes_to (type) != NULL_TREE)
1669 error ("An argument type that has a default promotion can't match an empty parameter name list declaration.");
1674 error_with_decl (olddecl, "previous declaration of `%s'");
1678 errmsg = redeclaration_error_message (newdecl, olddecl);
1684 error_with_decl (newdecl, "redefinition of `%s'");
1687 error_with_decl (newdecl, "redeclaration of `%s'");
1690 error_with_decl (newdecl, "conflicting declarations of `%s'");
1696 error_with_decl (olddecl,
1697 ((DECL_INITIAL (olddecl)
1698 && current_binding_level == global_binding_level)
1699 ? "`%s' previously defined here"
1700 : "`%s' previously declared here"));
1702 else if (TREE_CODE (newdecl) == TYPE_DECL
1703 && (DECL_IN_SYSTEM_HEADER (olddecl)
1704 || DECL_IN_SYSTEM_HEADER (newdecl)))
1706 warning_with_decl (newdecl, "redefinition of `%s'");
1709 ((DECL_INITIAL (olddecl)
1710 && current_binding_level == global_binding_level)
1711 ? "`%s' previously defined here"
1712 : "`%s' previously declared here"));
1714 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1715 && DECL_INITIAL (olddecl) != 0
1716 && TYPE_ARG_TYPES (oldtype) == 0
1717 && TYPE_ARG_TYPES (newtype) != 0
1718 && TYPE_ACTUAL_ARG_TYPES (oldtype) != 0)
1720 register tree type, parm;
1722 /* Prototype decl follows defn w/o prototype. */
1724 for (parm = TYPE_ACTUAL_ARG_TYPES (oldtype),
1725 type = TYPE_ARG_TYPES (newtype),
1728 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type), nargs++)
1730 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1731 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1733 warning_with_decl (newdecl, "prototype for `%s' follows");
1734 warning_with_decl (olddecl, "non-prototype definition here");
1737 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1738 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1740 error_with_decl (newdecl, "prototype for `%s' follows and number of arguments doesn't match");
1741 error_with_decl (olddecl, "non-prototype definition here");
1745 /* Type for passing arg must be consistent
1746 with that declared for the arg. */
1747 if (! comptypes (TREE_VALUE (parm), TREE_VALUE (type))
1748 /* If -traditional, allow `unsigned int' instead of `int'
1749 in the prototype. */
1750 && (! (flag_traditional
1751 && TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == integer_type_node
1752 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node)))
1754 error_with_decl (newdecl,
1755 "prototype for `%s' follows and argument %d doesn't match",
1757 error_with_decl (olddecl, "non-prototype definition here");
1763 /* Warn about mismatches in various flags. */
1766 /* Warn if function is now inline
1767 but was previously declared not inline and has been called. */
1768 if (TREE_CODE (olddecl) == FUNCTION_DECL
1769 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1770 && TREE_USED (olddecl))
1771 warning_with_decl (newdecl,
1772 "`%s' declared inline after being called");
1773 if (TREE_CODE (olddecl) == FUNCTION_DECL
1774 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1775 && DECL_INITIAL (olddecl) != 0)
1776 warning_with_decl (newdecl,
1777 "`%s' declared inline after its definition");
1779 /* If pedantic, warn when static declaration follows a non-static
1780 declaration. Otherwise, do so only for functions. */
1781 if ((pedantic || TREE_CODE (olddecl) == FUNCTION_DECL)
1782 && TREE_PUBLIC (olddecl)
1783 && !TREE_PUBLIC (newdecl))
1784 warning_with_decl (newdecl, "static declaration for `%s' follows non-static");
1786 /* If warn_traditional, warn when a non-static function
1787 declaration follows a static one. */
1788 if (warn_traditional
1789 && TREE_CODE (olddecl) == FUNCTION_DECL
1790 && !TREE_PUBLIC (olddecl)
1791 && TREE_PUBLIC (newdecl))
1792 warning_with_decl (newdecl, "non-static declaration for `%s' follows static");
1794 /* Warn when const declaration follows a non-const
1795 declaration, but not for functions. */
1796 if (TREE_CODE (olddecl) != FUNCTION_DECL
1797 && !TREE_READONLY (olddecl)
1798 && TREE_READONLY (newdecl))
1799 warning_with_decl (newdecl, "const declaration for `%s' follows non-const");
1800 /* These bits are logically part of the type, for variables.
1801 But not for functions
1802 (where qualifiers are not valid ANSI anyway). */
1803 else if (pedantic && TREE_CODE (olddecl) != FUNCTION_DECL
1804 && (TREE_READONLY (newdecl) != TREE_READONLY (olddecl)
1805 || TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl)))
1806 pedwarn_with_decl (newdecl, "type qualifiers for `%s' conflict with previous decl");
1810 /* Optionally warn about more than one declaration for the same name. */
1811 if (errmsg == 0 && warn_redundant_decls && DECL_SOURCE_LINE (olddecl) != 0
1812 /* Don't warn about a function declaration
1813 followed by a definition. */
1814 && !(TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) != 0
1815 && DECL_INITIAL (olddecl) == 0)
1816 /* Don't warn about extern decl followed by (tentative) definition. */
1817 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl)))
1819 warning_with_decl (newdecl, "redundant redeclaration of `%s' in same scope");
1820 warning_with_decl (olddecl, "previous declaration of `%s'");
1823 /* Copy all the DECL_... slots specified in the new decl
1824 except for any that we copy here from the old type.
1826 Past this point, we don't change OLDTYPE and NEWTYPE
1827 even if we change the types of NEWDECL and OLDDECL. */
1831 /* When copying info to olddecl, we store into write_olddecl
1832 instead. This allows us to avoid modifying olddecl when
1833 different_binding_level is true. */
1834 tree write_olddecl = different_binding_level ? newdecl : olddecl;
1836 /* Make sure we put the new type in the same obstack as the old ones.
1837 If the old types are not both in the same obstack, use the permanent
1839 if (TYPE_OBSTACK (oldtype) == TYPE_OBSTACK (newtype))
1840 push_obstacks (TYPE_OBSTACK (oldtype), TYPE_OBSTACK (oldtype));
1843 push_obstacks_nochange ();
1844 end_temporary_allocation ();
1847 /* Merge the data types specified in the two decls. */
1848 if (TREE_CODE (newdecl) != FUNCTION_DECL || !DECL_BUILT_IN (olddecl))
1850 if (different_binding_level)
1852 = build_type_attribute_variant
1854 merge_attributes (TYPE_ATTRIBUTES (newtype),
1855 TYPE_ATTRIBUTES (oldtype)));
1858 = TREE_TYPE (olddecl)
1859 = common_type (newtype, oldtype);
1862 /* Lay the type out, unless already done. */
1863 if (oldtype != TREE_TYPE (newdecl))
1865 if (TREE_TYPE (newdecl) != error_mark_node)
1866 layout_type (TREE_TYPE (newdecl));
1867 if (TREE_CODE (newdecl) != FUNCTION_DECL
1868 && TREE_CODE (newdecl) != TYPE_DECL
1869 && TREE_CODE (newdecl) != CONST_DECL)
1870 layout_decl (newdecl, 0);
1874 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1875 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1876 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1877 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1878 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1881 /* Keep the old rtl since we can safely use it. */
1882 DECL_RTL (newdecl) = DECL_RTL (olddecl);
1884 /* Merge the type qualifiers. */
1885 if (DECL_BUILT_IN_NONANSI (olddecl) && TREE_THIS_VOLATILE (olddecl)
1886 && !TREE_THIS_VOLATILE (newdecl))
1887 TREE_THIS_VOLATILE (write_olddecl) = 0;
1888 if (TREE_READONLY (newdecl))
1889 TREE_READONLY (write_olddecl) = 1;
1890 if (TREE_THIS_VOLATILE (newdecl))
1892 TREE_THIS_VOLATILE (write_olddecl) = 1;
1893 if (TREE_CODE (newdecl) == VAR_DECL)
1894 make_var_volatile (newdecl);
1897 /* Keep source location of definition rather than declaration. */
1898 /* When called with different_binding_level set, keep the old
1899 information so that meaningful diagnostics can be given. */
1900 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0
1901 && ! different_binding_level)
1903 DECL_SOURCE_LINE (newdecl) = DECL_SOURCE_LINE (olddecl);
1904 DECL_SOURCE_FILE (newdecl) = DECL_SOURCE_FILE (olddecl);
1907 /* Merge the unused-warning information. */
1908 if (DECL_IN_SYSTEM_HEADER (olddecl))
1909 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1910 else if (DECL_IN_SYSTEM_HEADER (newdecl))
1911 DECL_IN_SYSTEM_HEADER (write_olddecl) = 1;
1913 /* Merge the initialization information. */
1914 /* When called with different_binding_level set, don't copy over
1915 DECL_INITIAL, so that we don't accidentally change function
1916 declarations into function definitions. */
1917 if (DECL_INITIAL (newdecl) == 0 && ! different_binding_level)
1918 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
1920 /* Merge the section attribute.
1921 We want to issue an error if the sections conflict but that must be
1922 done later in decl_attributes since we are called before attributes
1924 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
1925 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
1927 /* Copy the assembler name.
1928 Currently, it can only be defined in the prototype. */
1929 DECL_ASSEMBLER_NAME (newdecl) = DECL_ASSEMBLER_NAME (olddecl);
1931 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1933 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
1934 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
1936 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
1937 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
1938 DECL_NO_CHECK_MEMORY_USAGE (newdecl)
1939 |= DECL_NO_CHECK_MEMORY_USAGE (olddecl);
1944 /* If cannot merge, then use the new type and qualifiers,
1945 and don't preserve the old rtl. */
1946 else if (! different_binding_level)
1948 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
1949 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
1950 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
1951 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
1954 /* Merge the storage class information. */
1955 DECL_WEAK (newdecl) |= DECL_WEAK (olddecl);
1956 /* For functions, static overrides non-static. */
1957 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1959 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
1960 /* This is since we don't automatically
1961 copy the attributes of NEWDECL into OLDDECL. */
1962 /* No need to worry about different_binding_level here because
1963 then TREE_PUBLIC (newdecl) was true. */
1964 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1965 /* If this clears `static', clear it in the identifier too. */
1966 if (! TREE_PUBLIC (olddecl))
1967 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
1969 if (DECL_EXTERNAL (newdecl))
1971 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
1972 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
1973 /* An extern decl does not override previous storage class. */
1974 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
1975 if (! DECL_EXTERNAL (newdecl))
1976 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
1980 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
1981 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
1984 /* If either decl says `inline', this fn is inline,
1985 unless its definition was passed already. */
1986 if (DECL_INLINE (newdecl) && DECL_INITIAL (olddecl) == 0)
1987 DECL_INLINE (olddecl) = 1;
1988 DECL_INLINE (newdecl) = DECL_INLINE (olddecl);
1990 if (TREE_CODE (newdecl) == FUNCTION_DECL)
1992 if (DECL_BUILT_IN (olddecl))
1994 /* Get rid of any built-in function if new arg types don't match it
1995 or if we have a function definition. */
1996 if (! types_match || new_is_definition)
1998 if (! different_binding_level)
2000 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
2001 DECL_BUILT_IN (olddecl) = 0;
2006 /* If redeclaring a builtin function, and not a definition,
2007 it stays built in. */
2008 DECL_BUILT_IN (newdecl) = 1;
2009 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
2012 /* Also preserve various other info from the definition. */
2013 else if (! new_is_definition)
2014 DECL_FRAME_SIZE (newdecl) = DECL_FRAME_SIZE (olddecl);
2015 if (! new_is_definition)
2017 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2018 /* When called with different_binding_level set, don't copy over
2019 DECL_INITIAL, so that we don't accidentally change function
2020 declarations into function definitions. */
2021 if (! different_binding_level)
2022 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
2023 DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
2024 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
2025 if (DECL_INLINE (newdecl))
2026 DECL_ABSTRACT_ORIGIN (newdecl) = DECL_ORIGIN (olddecl);
2029 if (different_binding_level)
2031 /* Don't output a duplicate symbol or debugging information for this
2034 Do not set TREE_ASM_WRITTEN for a FUNCTION_DECL since we may actually
2035 just have two declarations without a definition. VAR_DECLs may need
2036 the same treatment, I'm not sure. */
2037 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2038 DECL_IGNORED_P (newdecl) = 1;
2040 TREE_ASM_WRITTEN (newdecl) = DECL_IGNORED_P (newdecl) = 1;
2044 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
2045 But preserve OLDDECL's DECL_UID. */
2047 register unsigned olddecl_uid = DECL_UID (olddecl);
2049 bcopy ((char *) newdecl + sizeof (struct tree_common),
2050 (char *) olddecl + sizeof (struct tree_common),
2051 sizeof (struct tree_decl) - sizeof (struct tree_common));
2052 DECL_UID (olddecl) = olddecl_uid;
2055 /* NEWDECL contains the merged attribute lists.
2056 Update OLDDECL to be the same. */
2057 DECL_MACHINE_ATTRIBUTES (olddecl) = DECL_MACHINE_ATTRIBUTES (newdecl);
2062 /* Record a decl-node X as belonging to the current lexical scope.
2063 Check for errors (such as an incompatible declaration for the same
2064 name already seen in the same scope).
2066 Returns either X or an old decl for the same name.
2067 If an old decl is returned, it may have been smashed
2068 to agree with what X says. */
2075 register tree name = DECL_NAME (x);
2076 register struct binding_level *b = current_binding_level;
2078 DECL_CONTEXT (x) = current_function_decl;
2079 /* A local extern declaration for a function doesn't constitute nesting.
2080 A local auto declaration does, since it's a forward decl
2081 for a nested function coming later. */
2082 if (TREE_CODE (x) == FUNCTION_DECL && DECL_INITIAL (x) == 0
2083 && DECL_EXTERNAL (x))
2084 DECL_CONTEXT (x) = 0;
2086 if (warn_nested_externs && DECL_EXTERNAL (x) && b != global_binding_level
2087 && x != IDENTIFIER_IMPLICIT_DECL (name)
2088 /* Don't print error messages for __FUNCTION__ and __PRETTY_FUNCTION__ */
2089 && !DECL_IN_SYSTEM_HEADER (x))
2090 warning ("nested extern declaration of `%s'", IDENTIFIER_POINTER (name));
2096 int different_binding_level = 0;
2098 t = lookup_name_current_level (name);
2099 /* Don't type check externs here when -traditional. This is so that
2100 code with conflicting declarations inside blocks will get warnings
2101 not errors. X11 for instance depends on this. */
2102 if (! t && DECL_EXTERNAL (x) && TREE_PUBLIC (x) && ! flag_traditional)
2104 t = IDENTIFIER_GLOBAL_VALUE (name);
2105 /* Type decls at global scope don't conflict with externs declared
2106 inside lexical blocks. */
2107 if (t && TREE_CODE (t) == TYPE_DECL)
2109 different_binding_level = 1;
2111 if (t != 0 && t == error_mark_node)
2112 /* error_mark_node is 0 for a while during initialization! */
2115 error_with_decl (x, "`%s' used prior to declaration");
2120 file = DECL_SOURCE_FILE (t);
2121 line = DECL_SOURCE_LINE (t);
2124 /* If this decl is `static' and an implicit decl was seen previously,
2125 warn. But don't complain if -traditional,
2126 since traditional compilers don't complain. */
2127 if (! flag_traditional && TREE_PUBLIC (name)
2128 /* Don't test for DECL_EXTERNAL, because grokdeclarator
2129 sets this for all functions. */
2130 && ! TREE_PUBLIC (x)
2131 && (TREE_CODE (x) == FUNCTION_DECL || b == global_binding_level)
2132 /* We used to warn also for explicit extern followed by static,
2133 but sometimes you need to do it that way. */
2134 && IDENTIFIER_IMPLICIT_DECL (name) != 0)
2136 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2137 IDENTIFIER_POINTER (name));
2138 pedwarn_with_file_and_line
2139 (DECL_SOURCE_FILE (IDENTIFIER_IMPLICIT_DECL (name)),
2140 DECL_SOURCE_LINE (IDENTIFIER_IMPLICIT_DECL (name)),
2141 "previous declaration of `%s'",
2142 IDENTIFIER_POINTER (name));
2143 TREE_THIS_VOLATILE (name) = 1;
2146 if (t != 0 && duplicate_decls (x, t, different_binding_level))
2148 if (TREE_CODE (t) == PARM_DECL)
2150 /* Don't allow more than one "real" duplicate
2151 of a forward parm decl. */
2152 TREE_ASM_WRITTEN (t) = TREE_ASM_WRITTEN (x);
2158 /* If we are processing a typedef statement, generate a whole new
2159 ..._TYPE node (which will be just an variant of the existing
2160 ..._TYPE node with identical properties) and then install the
2161 TYPE_DECL node generated to represent the typedef name as the
2162 TYPE_NAME of this brand new (duplicate) ..._TYPE node.
2164 The whole point here is to end up with a situation where each
2165 and every ..._TYPE node the compiler creates will be uniquely
2166 associated with AT MOST one node representing a typedef name.
2167 This way, even though the compiler substitutes corresponding
2168 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
2169 early on, later parts of the compiler can always do the reverse
2170 translation and get back the corresponding typedef name. For
2173 typedef struct S MY_TYPE;
2176 Later parts of the compiler might only know that `object' was of
2177 type `struct S' if it were not for code just below. With this
2178 code however, later parts of the compiler see something like:
2180 struct S' == struct S
2181 typedef struct S' MY_TYPE;
2184 And they can then deduce (from the node for type struct S') that
2185 the original object declaration was:
2189 Being able to do this is important for proper support of protoize,
2190 and also for generating precise symbolic debugging information
2191 which takes full account of the programmer's (typedef) vocabulary.
2193 Obviously, we don't want to generate a duplicate ..._TYPE node if
2194 the TYPE_DECL node that we are now processing really represents a
2195 standard built-in type.
2197 Since all standard types are effectively declared at line zero
2198 in the source file, we can easily check to see if we are working
2199 on a standard type by checking the current value of lineno. */
2201 if (TREE_CODE (x) == TYPE_DECL)
2203 if (DECL_SOURCE_LINE (x) == 0)
2205 if (TYPE_NAME (TREE_TYPE (x)) == 0)
2206 TYPE_NAME (TREE_TYPE (x)) = x;
2208 else if (TREE_TYPE (x) != error_mark_node
2209 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
2211 tree tt = TREE_TYPE (x);
2212 DECL_ORIGINAL_TYPE (x) = tt;
2213 tt = build_type_copy (tt);
2219 /* Multiple external decls of the same identifier ought to match.
2220 Check against both global declarations (when traditional) and out of
2221 scope (limbo) block level declarations.
2223 We get warnings about inline functions where they are defined.
2224 Avoid duplicate warnings where they are used. */
2225 if (TREE_PUBLIC (x) && ! DECL_INLINE (x))
2229 if (flag_traditional && IDENTIFIER_GLOBAL_VALUE (name) != 0
2230 && (DECL_EXTERNAL (IDENTIFIER_GLOBAL_VALUE (name))
2231 || TREE_PUBLIC (IDENTIFIER_GLOBAL_VALUE (name))))
2232 decl = IDENTIFIER_GLOBAL_VALUE (name);
2233 else if (IDENTIFIER_LIMBO_VALUE (name) != 0)
2234 /* Decls in limbo are always extern, so no need to check that. */
2235 decl = IDENTIFIER_LIMBO_VALUE (name);
2239 if (decl && ! comptypes (TREE_TYPE (x), TREE_TYPE (decl))
2240 /* If old decl is built-in, we already warned if we should. */
2241 && !DECL_BUILT_IN (decl))
2243 pedwarn_with_decl (x,
2244 "type mismatch with previous external decl");
2245 pedwarn_with_decl (decl, "previous external decl of `%s'");
2249 /* If a function has had an implicit declaration, and then is defined,
2250 make sure they are compatible. */
2252 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2253 && IDENTIFIER_GLOBAL_VALUE (name) == 0
2254 && TREE_CODE (x) == FUNCTION_DECL
2255 && ! comptypes (TREE_TYPE (x),
2256 TREE_TYPE (IDENTIFIER_IMPLICIT_DECL (name))))
2258 warning_with_decl (x, "type mismatch with previous implicit declaration");
2259 warning_with_decl (IDENTIFIER_IMPLICIT_DECL (name),
2260 "previous implicit declaration of `%s'");
2263 /* In PCC-compatibility mode, extern decls of vars with no current decl
2264 take effect at top level no matter where they are. */
2265 if (flag_traditional && DECL_EXTERNAL (x)
2266 && lookup_name (name) == 0)
2268 tree type = TREE_TYPE (x);
2270 /* But don't do this if the type contains temporary nodes. */
2273 if (type == error_mark_node)
2275 if (! TREE_PERMANENT (type))
2277 warning_with_decl (x, "type of external `%s' is not global");
2278 /* By exiting the loop early, we leave TYPE nonzero,
2279 and thus prevent globalization of the decl. */
2282 else if (TREE_CODE (type) == FUNCTION_TYPE
2283 && TYPE_ARG_TYPES (type) != 0)
2284 /* The types might not be truly local,
2285 but the list of arg types certainly is temporary.
2286 Since prototypes are nontraditional,
2287 ok not to do the traditional thing. */
2289 type = TREE_TYPE (type);
2293 b = global_binding_level;
2296 /* This name is new in its binding level.
2297 Install the new declaration and return it. */
2298 if (b == global_binding_level)
2300 /* Install a global value. */
2302 /* If the first global decl has external linkage,
2303 warn if we later see static one. */
2304 if (IDENTIFIER_GLOBAL_VALUE (name) == 0 && TREE_PUBLIC (x))
2305 TREE_PUBLIC (name) = 1;
2307 IDENTIFIER_GLOBAL_VALUE (name) = x;
2309 /* We no longer care about any previous block level declarations. */
2310 IDENTIFIER_LIMBO_VALUE (name) = 0;
2312 /* Don't forget if the function was used via an implicit decl. */
2313 if (IDENTIFIER_IMPLICIT_DECL (name)
2314 && TREE_USED (IDENTIFIER_IMPLICIT_DECL (name)))
2315 TREE_USED (x) = 1, TREE_USED (name) = 1;
2317 /* Don't forget if its address was taken in that way. */
2318 if (IDENTIFIER_IMPLICIT_DECL (name)
2319 && TREE_ADDRESSABLE (IDENTIFIER_IMPLICIT_DECL (name)))
2320 TREE_ADDRESSABLE (x) = 1;
2322 /* Warn about mismatches against previous implicit decl. */
2323 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2324 /* If this real decl matches the implicit, don't complain. */
2325 && ! (TREE_CODE (x) == FUNCTION_DECL
2326 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (x)))
2327 == integer_type_node)))
2328 pedwarn ("`%s' was previously implicitly declared to return `int'",
2329 IDENTIFIER_POINTER (name));
2331 /* If this decl is `static' and an `extern' was seen previously,
2332 that is erroneous. */
2333 if (TREE_PUBLIC (name)
2334 && ! TREE_PUBLIC (x) && ! DECL_EXTERNAL (x))
2336 /* Okay to redeclare an ANSI built-in as static. */
2337 if (t != 0 && DECL_BUILT_IN (t))
2339 /* Okay to declare a non-ANSI built-in as anything. */
2340 else if (t != 0 && DECL_BUILT_IN_NONANSI (t))
2342 /* Okay to have global type decl after an earlier extern
2343 declaration inside a lexical block. */
2344 else if (TREE_CODE (x) == TYPE_DECL)
2346 else if (IDENTIFIER_IMPLICIT_DECL (name))
2348 if (! TREE_THIS_VOLATILE (name))
2349 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2350 IDENTIFIER_POINTER (name));
2353 pedwarn ("`%s' was declared `extern' and later `static'",
2354 IDENTIFIER_POINTER (name));
2359 /* Here to install a non-global value. */
2360 tree oldlocal = IDENTIFIER_LOCAL_VALUE (name);
2361 tree oldglobal = IDENTIFIER_GLOBAL_VALUE (name);
2362 IDENTIFIER_LOCAL_VALUE (name) = x;
2364 /* If this is an extern function declaration, see if we
2365 have a global definition or declaration for the function. */
2367 && DECL_EXTERNAL (x) && !DECL_INLINE (x)
2369 && TREE_CODE (x) == FUNCTION_DECL
2370 && TREE_CODE (oldglobal) == FUNCTION_DECL)
2372 /* We have one. Their types must agree. */
2373 if (! comptypes (TREE_TYPE (x),
2374 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (name))))
2375 pedwarn_with_decl (x, "extern declaration of `%s' doesn't match global one");
2378 /* Inner extern decl is inline if global one is.
2379 Copy enough to really inline it. */
2380 if (DECL_INLINE (oldglobal))
2382 DECL_INLINE (x) = DECL_INLINE (oldglobal);
2383 DECL_INITIAL (x) = (current_function_decl == oldglobal
2384 ? 0 : DECL_INITIAL (oldglobal));
2385 DECL_SAVED_INSNS (x) = DECL_SAVED_INSNS (oldglobal);
2386 DECL_FRAME_SIZE (x) = DECL_FRAME_SIZE (oldglobal);
2387 DECL_ARGUMENTS (x) = DECL_ARGUMENTS (oldglobal);
2388 DECL_RESULT (x) = DECL_RESULT (oldglobal);
2389 TREE_ASM_WRITTEN (x) = TREE_ASM_WRITTEN (oldglobal);
2390 DECL_ABSTRACT_ORIGIN (x) = DECL_ORIGIN (oldglobal);
2392 /* Inner extern decl is built-in if global one is. */
2393 if (DECL_BUILT_IN (oldglobal))
2395 DECL_BUILT_IN (x) = DECL_BUILT_IN (oldglobal);
2396 DECL_FUNCTION_CODE (x) = DECL_FUNCTION_CODE (oldglobal);
2398 /* Keep the arg types from a file-scope fcn defn. */
2399 if (TYPE_ARG_TYPES (TREE_TYPE (oldglobal)) != 0
2400 && DECL_INITIAL (oldglobal)
2401 && TYPE_ARG_TYPES (TREE_TYPE (x)) == 0)
2402 TREE_TYPE (x) = TREE_TYPE (oldglobal);
2406 #if 0 /* This case is probably sometimes the right thing to do. */
2407 /* If we have a local external declaration,
2408 then any file-scope declaration should not
2409 have been static. */
2410 if (oldlocal == 0 && oldglobal != 0
2411 && !TREE_PUBLIC (oldglobal)
2412 && DECL_EXTERNAL (x) && TREE_PUBLIC (x))
2413 warning ("`%s' locally external but globally static",
2414 IDENTIFIER_POINTER (name));
2417 /* If we have a local external declaration,
2418 and no file-scope declaration has yet been seen,
2419 then if we later have a file-scope decl it must not be static. */
2421 && DECL_EXTERNAL (x)
2425 TREE_PUBLIC (name) = 1;
2427 /* Save this decl, so that we can do type checking against
2428 other decls after it falls out of scope.
2430 Only save it once. This prevents temporary decls created in
2431 expand_inline_function from being used here, since this
2432 will have been set when the inline function was parsed.
2433 It also helps give slightly better warnings. */
2434 if (IDENTIFIER_LIMBO_VALUE (name) == 0)
2435 IDENTIFIER_LIMBO_VALUE (name) = x;
2438 /* Warn if shadowing an argument at the top level of the body. */
2439 if (oldlocal != 0 && !DECL_EXTERNAL (x)
2440 /* This warning doesn't apply to the parms of a nested fcn. */
2441 && ! current_binding_level->parm_flag
2442 /* Check that this is one level down from the parms. */
2443 && current_binding_level->level_chain->parm_flag
2444 /* Check that the decl being shadowed
2445 comes from the parm level, one level up. */
2446 && chain_member (oldlocal, current_binding_level->level_chain->names))
2448 if (TREE_CODE (oldlocal) == PARM_DECL)
2449 pedwarn ("declaration of `%s' shadows a parameter",
2450 IDENTIFIER_POINTER (name));
2452 pedwarn ("declaration of `%s' shadows a symbol from the parameter list",
2453 IDENTIFIER_POINTER (name));
2456 /* Maybe warn if shadowing something else. */
2457 else if (warn_shadow && !DECL_EXTERNAL (x)
2458 /* No shadow warnings for internally generated vars. */
2459 && DECL_SOURCE_LINE (x) != 0
2460 /* No shadow warnings for vars made for inlining. */
2461 && ! DECL_FROM_INLINE (x))
2463 char *id = IDENTIFIER_POINTER (name);
2465 if (TREE_CODE (x) == PARM_DECL
2466 && current_binding_level->level_chain->parm_flag)
2467 /* Don't warn about the parm names in function declarator
2468 within a function declarator.
2469 It would be nice to avoid warning in any function
2470 declarator in a declaration, as opposed to a definition,
2471 but there is no way to tell it's not a definition. */
2473 else if (oldlocal != 0 && TREE_CODE (oldlocal) == PARM_DECL)
2474 warning ("declaration of `%s' shadows a parameter", id);
2475 else if (oldlocal != 0)
2476 warning ("declaration of `%s' shadows previous local", id);
2477 else if (IDENTIFIER_GLOBAL_VALUE (name) != 0
2478 && IDENTIFIER_GLOBAL_VALUE (name) != error_mark_node)
2479 warning ("declaration of `%s' shadows global declaration", id);
2482 /* If storing a local value, there may already be one (inherited).
2483 If so, record it for restoration when this binding level ends. */
2485 b->shadowed = tree_cons (name, oldlocal, b->shadowed);
2488 /* Keep count of variables in this level with incomplete type. */
2489 if (TYPE_SIZE (TREE_TYPE (x)) == 0)
2493 /* Put decls on list in reverse order.
2494 We will reverse them later if necessary. */
2495 TREE_CHAIN (x) = b->names;
2501 /* Like pushdecl, only it places X in GLOBAL_BINDING_LEVEL, if appropriate. */
2504 pushdecl_top_level (x)
2508 register struct binding_level *b = current_binding_level;
2510 current_binding_level = global_binding_level;
2512 current_binding_level = b;
2516 /* Generate an implicit declaration for identifier FUNCTIONID
2517 as a function of type int (). Print a warning if appropriate. */
2520 implicitly_declare (functionid)
2524 int traditional_warning = 0;
2525 /* Only one "implicit declaration" warning per identifier. */
2526 int implicit_warning;
2528 /* Save the decl permanently so we can warn if definition follows. */
2529 push_obstacks_nochange ();
2530 end_temporary_allocation ();
2532 /* We used to reuse an old implicit decl here,
2533 but this loses with inline functions because it can clobber
2534 the saved decl chains. */
2535 /* if (IDENTIFIER_IMPLICIT_DECL (functionid) != 0)
2536 decl = IDENTIFIER_IMPLICIT_DECL (functionid);
2538 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2540 /* Warn of implicit decl following explicit local extern decl.
2541 This is probably a program designed for traditional C. */
2542 if (TREE_PUBLIC (functionid) && IDENTIFIER_GLOBAL_VALUE (functionid) == 0)
2543 traditional_warning = 1;
2545 /* Warn once of an implicit declaration. */
2546 implicit_warning = (IDENTIFIER_IMPLICIT_DECL (functionid) == 0);
2548 DECL_EXTERNAL (decl) = 1;
2549 TREE_PUBLIC (decl) = 1;
2551 /* Record that we have an implicit decl and this is it. */
2552 IDENTIFIER_IMPLICIT_DECL (functionid) = decl;
2554 /* ANSI standard says implicit declarations are in the innermost block.
2555 So we record the decl in the standard fashion.
2556 If flag_traditional is set, pushdecl does it top-level. */
2559 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
2560 maybe_objc_check_decl (decl);
2562 rest_of_decl_compilation (decl, NULL_PTR, 0, 0);
2564 if (mesg_implicit_function_declaration && implicit_warning)
2566 if (mesg_implicit_function_declaration == 2)
2567 error ("implicit declaration of function `%s'",
2568 IDENTIFIER_POINTER (functionid));
2570 warning ("implicit declaration of function `%s'",
2571 IDENTIFIER_POINTER (functionid));
2573 else if (warn_traditional && traditional_warning)
2574 warning ("function `%s' was previously declared within a block",
2575 IDENTIFIER_POINTER (functionid));
2577 /* Write a record describing this implicit function declaration to the
2578 prototypes file (if requested). */
2580 gen_aux_info_record (decl, 0, 1, 0);
2587 /* Return zero if the declaration NEWDECL is valid
2588 when the declaration OLDDECL (assumed to be for the same name)
2589 has already been seen.
2590 Otherwise return 1 if NEWDECL is a redefinition, 2 if it is a redeclaration,
2591 and 3 if it is a conflicting declaration. */
2594 redeclaration_error_message (newdecl, olddecl)
2595 tree newdecl, olddecl;
2597 if (TREE_CODE (newdecl) == TYPE_DECL)
2599 if (flag_traditional && TREE_TYPE (newdecl) == TREE_TYPE (olddecl))
2601 /* pushdecl creates distinct types for TYPE_DECLs by calling
2602 build_type_copy, so the above comparison generally fails. We do
2603 another test against the TYPE_MAIN_VARIANT of the olddecl, which
2604 is equivalent to what this code used to do before the build_type_copy
2605 call. The variant type distinction should not matter for traditional
2606 code, because it doesn't have type qualifiers. */
2607 if (flag_traditional
2608 && TYPE_MAIN_VARIANT (TREE_TYPE (olddecl)) == TREE_TYPE (newdecl))
2610 if (DECL_IN_SYSTEM_HEADER (olddecl) || DECL_IN_SYSTEM_HEADER (newdecl))
2614 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2616 /* Declarations of functions can insist on internal linkage
2617 but they can't be inconsistent with internal linkage,
2618 so there can be no error on that account.
2619 However defining the same name twice is no good. */
2620 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0
2621 /* However, defining once as extern inline and a second
2622 time in another way is ok. */
2623 && !(DECL_INLINE (olddecl) && DECL_EXTERNAL (olddecl)
2624 && !(DECL_INLINE (newdecl) && DECL_EXTERNAL (newdecl))))
2628 else if (current_binding_level == global_binding_level)
2630 /* Objects declared at top level: */
2631 /* If at least one is a reference, it's ok. */
2632 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2634 /* Reject two definitions. */
2635 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0)
2637 /* Now we have two tentative defs, or one tentative and one real def. */
2638 /* Insist that the linkage match. */
2639 if (TREE_PUBLIC (olddecl) != TREE_PUBLIC (newdecl))
2643 else if (current_binding_level->parm_flag
2644 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2648 /* Newdecl has block scope. If olddecl has block scope also, then
2649 reject two definitions, and reject a definition together with an
2650 external reference. Otherwise, it is OK, because newdecl must
2651 be an extern reference to olddecl. */
2652 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl))
2653 && DECL_CONTEXT (newdecl) == DECL_CONTEXT (olddecl))
2659 /* Get the LABEL_DECL corresponding to identifier ID as a label.
2660 Create one if none exists so far for the current function.
2661 This function is called for both label definitions and label references. */
2667 register tree decl = IDENTIFIER_LABEL_VALUE (id);
2669 if (current_function_decl == 0)
2671 error ("label %s referenced outside of any function",
2672 IDENTIFIER_POINTER (id));
2676 /* Use a label already defined or ref'd with this name. */
2679 /* But not if it is inherited and wasn't declared to be inheritable. */
2680 if (DECL_CONTEXT (decl) != current_function_decl
2681 && ! C_DECLARED_LABEL_FLAG (decl))
2682 return shadow_label (id);
2686 decl = build_decl (LABEL_DECL, id, void_type_node);
2688 /* Make sure every label has an rtx. */
2691 /* A label not explicitly declared must be local to where it's ref'd. */
2692 DECL_CONTEXT (decl) = current_function_decl;
2694 DECL_MODE (decl) = VOIDmode;
2696 /* Say where one reference is to the label,
2697 for the sake of the error if it is not defined. */
2698 DECL_SOURCE_LINE (decl) = lineno;
2699 DECL_SOURCE_FILE (decl) = input_filename;
2701 IDENTIFIER_LABEL_VALUE (id) = decl;
2703 named_labels = tree_cons (NULL_TREE, decl, named_labels);
2708 /* Make a label named NAME in the current function,
2709 shadowing silently any that may be inherited from containing functions
2710 or containing scopes.
2712 Note that valid use, if the label being shadowed
2713 comes from another scope in the same function,
2714 requires calling declare_nonlocal_label right away. */
2720 register tree decl = IDENTIFIER_LABEL_VALUE (name);
2726 /* Check to make sure that the label hasn't already been declared
2727 at this label scope */
2728 for (dup = named_labels; dup; dup = TREE_CHAIN (dup))
2729 if (TREE_VALUE (dup) == decl)
2731 error ("duplicate label declaration `%s'",
2732 IDENTIFIER_POINTER (name));
2733 error_with_decl (TREE_VALUE (dup),
2734 "this is a previous declaration");
2735 /* Just use the previous declaration. */
2736 return lookup_label (name);
2739 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2740 IDENTIFIER_LABEL_VALUE (name) = decl = 0;
2743 return lookup_label (name);
2746 /* Define a label, specifying the location in the source file.
2747 Return the LABEL_DECL node for the label, if the definition is valid.
2748 Otherwise return 0. */
2751 define_label (filename, line, name)
2756 tree decl = lookup_label (name);
2758 /* If label with this name is known from an outer context, shadow it. */
2759 if (decl != 0 && DECL_CONTEXT (decl) != current_function_decl)
2761 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2762 IDENTIFIER_LABEL_VALUE (name) = 0;
2763 decl = lookup_label (name);
2766 if (DECL_INITIAL (decl) != 0)
2768 error ("duplicate label `%s'", IDENTIFIER_POINTER (name));
2773 /* Mark label as having been defined. */
2774 DECL_INITIAL (decl) = error_mark_node;
2775 /* Say where in the source. */
2776 DECL_SOURCE_FILE (decl) = filename;
2777 DECL_SOURCE_LINE (decl) = line;
2782 /* Return the list of declarations of the current level.
2783 Note that this list is in reverse order unless/until
2784 you nreverse it; and when you do nreverse it, you must
2785 store the result back using `storedecls' or you will lose. */
2790 return current_binding_level->names;
2793 /* Return the list of type-tags (for structs, etc) of the current level. */
2798 return current_binding_level->tags;
2801 /* Store the list of declarations of the current level.
2802 This is done for the parameter declarations of a function being defined,
2803 after they are modified in the light of any missing parameters. */
2809 current_binding_level->names = decls;
2812 /* Similarly, store the list of tags of the current level. */
2818 current_binding_level->tags = tags;
2821 /* Given NAME, an IDENTIFIER_NODE,
2822 return the structure (or union or enum) definition for that name.
2823 Searches binding levels from BINDING_LEVEL up to the global level.
2824 If THISLEVEL_ONLY is nonzero, searches only the specified context
2825 (but skips any tag-transparent contexts to find one that is
2826 meaningful for tags).
2827 CODE says which kind of type the caller wants;
2828 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2829 If the wrong kind of type is found, an error is reported. */
2832 lookup_tag (code, name, binding_level, thislevel_only)
2833 enum tree_code code;
2834 struct binding_level *binding_level;
2838 register struct binding_level *level;
2840 for (level = binding_level; level; level = level->level_chain)
2843 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2845 if (TREE_PURPOSE (tail) == name)
2847 if (TREE_CODE (TREE_VALUE (tail)) != code)
2849 /* Definition isn't the kind we were looking for. */
2850 pending_invalid_xref = name;
2851 pending_invalid_xref_file = input_filename;
2852 pending_invalid_xref_line = lineno;
2854 return TREE_VALUE (tail);
2857 if (thislevel_only && ! level->tag_transparent)
2863 /* Print an error message now
2864 for a recent invalid struct, union or enum cross reference.
2865 We don't print them immediately because they are not invalid
2866 when used in the `struct foo;' construct for shadowing. */
2869 pending_xref_error ()
2871 if (pending_invalid_xref != 0)
2872 error_with_file_and_line (pending_invalid_xref_file,
2873 pending_invalid_xref_line,
2874 "`%s' defined as wrong kind of tag",
2875 IDENTIFIER_POINTER (pending_invalid_xref));
2876 pending_invalid_xref = 0;
2879 /* Given a type, find the tag that was defined for it and return the tag name.
2880 Otherwise return 0. */
2883 lookup_tag_reverse (type)
2886 register struct binding_level *level;
2888 for (level = current_binding_level; level; level = level->level_chain)
2891 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2893 if (TREE_VALUE (tail) == type)
2894 return TREE_PURPOSE (tail);
2900 /* Look up NAME in the current binding level and its superiors
2901 in the namespace of variables, functions and typedefs.
2902 Return a ..._DECL node of some kind representing its definition,
2903 or return 0 if it is undefined. */
2910 if (current_binding_level != global_binding_level
2911 && IDENTIFIER_LOCAL_VALUE (name))
2912 val = IDENTIFIER_LOCAL_VALUE (name);
2914 val = IDENTIFIER_GLOBAL_VALUE (name);
2918 /* Similar to `lookup_name' but look only at current binding level. */
2921 lookup_name_current_level (name)
2926 if (current_binding_level == global_binding_level)
2927 return IDENTIFIER_GLOBAL_VALUE (name);
2929 if (IDENTIFIER_LOCAL_VALUE (name) == 0)
2932 for (t = current_binding_level->names; t; t = TREE_CHAIN (t))
2933 if (DECL_NAME (t) == name)
2939 /* Mark ARG for GC. */
2941 mark_binding_level (arg)
2944 struct binding_level *level = *(struct binding_level **) arg;
2948 ggc_mark_tree (level->names);
2949 ggc_mark_tree (level->tags);
2950 ggc_mark_tree (level->shadowed);
2951 ggc_mark_tree (level->blocks);
2952 ggc_mark_tree (level->this_block);
2953 ggc_mark_tree (level->parm_order);
2954 level = level->level_chain;
2958 /* Create the predefined scalar types of C,
2959 and some nodes representing standard constants (0, 1, (void *) 0).
2960 Initialize the global binding level.
2961 Make definitions for built-in primitive functions. */
2964 init_decl_processing ()
2966 register tree endlink;
2967 tree ptr_ftype_void, ptr_ftype_ptr;
2968 int wchar_type_size;
2969 tree array_domain_type;
2971 current_function_decl = NULL;
2972 named_labels = NULL;
2973 current_binding_level = NULL_BINDING_LEVEL;
2974 free_binding_level = NULL_BINDING_LEVEL;
2975 pushlevel (0); /* make the binding_level structure for global names */
2976 global_binding_level = current_binding_level;
2978 /* Define `int' and `char' first so that dbx will output them first. */
2980 integer_type_node = make_signed_type (INT_TYPE_SIZE);
2981 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_INT],
2982 integer_type_node));
2984 /* Define `char', which is like either `signed char' or `unsigned char'
2985 but not the same as either. */
2989 ? make_signed_type (CHAR_TYPE_SIZE)
2990 : make_unsigned_type (CHAR_TYPE_SIZE));
2991 pushdecl (build_decl (TYPE_DECL, get_identifier ("char"),
2994 long_integer_type_node = make_signed_type (LONG_TYPE_SIZE);
2995 pushdecl (build_decl (TYPE_DECL, get_identifier ("long int"),
2996 long_integer_type_node));
2998 unsigned_type_node = make_unsigned_type (INT_TYPE_SIZE);
2999 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned int"),
3000 unsigned_type_node));
3002 long_unsigned_type_node = make_unsigned_type (LONG_TYPE_SIZE);
3003 pushdecl (build_decl (TYPE_DECL, get_identifier ("long unsigned int"),
3004 long_unsigned_type_node));
3006 long_long_integer_type_node = make_signed_type (LONG_LONG_TYPE_SIZE);
3007 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long int"),
3008 long_long_integer_type_node));
3010 long_long_unsigned_type_node = make_unsigned_type (LONG_LONG_TYPE_SIZE);
3011 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long unsigned int"),
3012 long_long_unsigned_type_node));
3014 short_integer_type_node = make_signed_type (SHORT_TYPE_SIZE);
3015 pushdecl (build_decl (TYPE_DECL, get_identifier ("short int"),
3016 short_integer_type_node));
3018 short_unsigned_type_node = make_unsigned_type (SHORT_TYPE_SIZE);
3019 pushdecl (build_decl (TYPE_DECL, get_identifier ("short unsigned int"),
3020 short_unsigned_type_node));
3022 /* `unsigned long' is the standard type for sizeof.
3023 Traditionally, use a signed type.
3024 Note that stddef.h uses `unsigned long',
3025 and this must agree, even if long and int are the same size. */
3027 (TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (SIZE_TYPE))));
3028 if (flag_traditional && TREE_UNSIGNED (sizetype))
3029 set_sizetype (signed_type (sizetype));
3032 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (PTRDIFF_TYPE)));
3034 error_mark_node = make_node (ERROR_MARK);
3035 TREE_TYPE (error_mark_node) = error_mark_node;
3037 /* Define both `signed char' and `unsigned char'. */
3038 signed_char_type_node = make_signed_type (CHAR_TYPE_SIZE);
3039 pushdecl (build_decl (TYPE_DECL, get_identifier ("signed char"),
3040 signed_char_type_node));
3042 unsigned_char_type_node = make_unsigned_type (CHAR_TYPE_SIZE);
3043 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned char"),
3044 unsigned_char_type_node));
3046 /* Create the widest literal types. */
3047 widest_integer_literal_type_node = make_signed_type (HOST_BITS_PER_WIDE_INT * 2);
3048 pushdecl (build_decl (TYPE_DECL, NULL_TREE,
3049 widest_integer_literal_type_node));
3051 widest_unsigned_literal_type_node = make_unsigned_type (HOST_BITS_PER_WIDE_INT * 2);
3052 pushdecl (build_decl (TYPE_DECL, NULL_TREE,
3053 widest_unsigned_literal_type_node));
3055 /* Now all the integer mode types. */
3056 intQI_type_node = make_signed_type (GET_MODE_BITSIZE (QImode));
3057 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intQI_type_node));
3059 intHI_type_node = make_signed_type (GET_MODE_BITSIZE (HImode));
3060 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intHI_type_node));
3062 intSI_type_node = make_signed_type (GET_MODE_BITSIZE (SImode));
3063 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intSI_type_node));
3065 intDI_type_node = make_signed_type (GET_MODE_BITSIZE (DImode));
3066 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intDI_type_node));
3068 #if HOST_BITS_PER_WIDE_INT >= 64
3069 intTI_type_node = make_signed_type (GET_MODE_BITSIZE (TImode));
3070 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intTI_type_node));
3073 unsigned_intQI_type_node = make_unsigned_type (GET_MODE_BITSIZE (QImode));
3074 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intQI_type_node));
3076 unsigned_intHI_type_node = make_unsigned_type (GET_MODE_BITSIZE (HImode));
3077 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intHI_type_node));
3079 unsigned_intSI_type_node = make_unsigned_type (GET_MODE_BITSIZE (SImode));
3080 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intSI_type_node));
3082 unsigned_intDI_type_node = make_unsigned_type (GET_MODE_BITSIZE (DImode));
3083 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intDI_type_node));
3085 #if HOST_BITS_PER_WIDE_INT >= 64
3086 unsigned_intTI_type_node = make_unsigned_type (GET_MODE_BITSIZE (TImode));
3087 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intTI_type_node));
3090 float_type_node = make_node (REAL_TYPE);
3091 TYPE_PRECISION (float_type_node) = FLOAT_TYPE_SIZE;
3092 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_FLOAT],
3094 layout_type (float_type_node);
3096 double_type_node = make_node (REAL_TYPE);
3097 if (flag_short_double)
3098 TYPE_PRECISION (double_type_node) = FLOAT_TYPE_SIZE;
3100 TYPE_PRECISION (double_type_node) = DOUBLE_TYPE_SIZE;
3101 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_DOUBLE],
3103 layout_type (double_type_node);
3105 long_double_type_node = make_node (REAL_TYPE);
3106 TYPE_PRECISION (long_double_type_node) = LONG_DOUBLE_TYPE_SIZE;
3107 pushdecl (build_decl (TYPE_DECL, get_identifier ("long double"),
3108 long_double_type_node));
3109 layout_type (long_double_type_node);
3111 complex_integer_type_node = make_node (COMPLEX_TYPE);
3112 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex int"),
3113 complex_integer_type_node));
3114 TREE_TYPE (complex_integer_type_node) = integer_type_node;
3115 layout_type (complex_integer_type_node);
3117 complex_float_type_node = make_node (COMPLEX_TYPE);
3118 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex float"),
3119 complex_float_type_node));
3120 TREE_TYPE (complex_float_type_node) = float_type_node;
3121 layout_type (complex_float_type_node);
3123 complex_double_type_node = make_node (COMPLEX_TYPE);
3124 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex double"),
3125 complex_double_type_node));
3126 TREE_TYPE (complex_double_type_node) = double_type_node;
3127 layout_type (complex_double_type_node);
3129 complex_long_double_type_node = make_node (COMPLEX_TYPE);
3130 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex long double"),
3131 complex_long_double_type_node));
3132 TREE_TYPE (complex_long_double_type_node) = long_double_type_node;
3133 layout_type (complex_long_double_type_node);
3136 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (WCHAR_TYPE)));
3137 wchar_type_size = TYPE_PRECISION (wchar_type_node);
3138 signed_wchar_type_node = signed_type (wchar_type_node);
3139 unsigned_wchar_type_node = unsigned_type (wchar_type_node);
3141 integer_zero_node = build_int_2 (0, 0);
3142 TREE_TYPE (integer_zero_node) = integer_type_node;
3143 integer_one_node = build_int_2 (1, 0);
3144 TREE_TYPE (integer_one_node) = integer_type_node;
3146 boolean_type_node = integer_type_node;
3147 boolean_true_node = integer_one_node;
3148 boolean_false_node = integer_zero_node;
3150 size_zero_node = build_int_2 (0, 0);
3151 TREE_TYPE (size_zero_node) = sizetype;
3152 size_one_node = build_int_2 (1, 0);
3153 TREE_TYPE (size_one_node) = sizetype;
3155 void_type_node = make_node (VOID_TYPE);
3156 pushdecl (build_decl (TYPE_DECL,
3157 ridpointers[(int) RID_VOID], void_type_node));
3158 layout_type (void_type_node); /* Uses integer_zero_node */
3159 /* We are not going to have real types in C with less than byte alignment,
3160 so we might as well not have any types that claim to have it. */
3161 TYPE_ALIGN (void_type_node) = BITS_PER_UNIT;
3163 null_pointer_node = build_int_2 (0, 0);
3164 TREE_TYPE (null_pointer_node) = build_pointer_type (void_type_node);
3165 layout_type (TREE_TYPE (null_pointer_node));
3167 string_type_node = build_pointer_type (char_type_node);
3168 const_string_type_node
3169 = build_pointer_type (build_type_variant (char_type_node, 1, 0));
3171 /* Make a type to be the domain of a few array types
3172 whose domains don't really matter.
3173 200 is small enough that it always fits in size_t
3174 and large enough that it can hold most function names for the
3175 initializations of __FUNCTION__ and __PRETTY_FUNCTION__. */
3176 array_domain_type = build_index_type (build_int_2 (200, 0));
3178 /* make a type for arrays of characters.
3179 With luck nothing will ever really depend on the length of this
3181 char_array_type_node
3182 = build_array_type (char_type_node, array_domain_type);
3183 /* Likewise for arrays of ints. */
3185 = build_array_type (integer_type_node, array_domain_type);
3186 /* This is for wide string constants. */
3187 wchar_array_type_node
3188 = build_array_type (wchar_type_node, array_domain_type);
3190 void_list_node = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
3192 default_function_type
3193 = build_function_type (integer_type_node, NULL_TREE);
3195 ptr_type_node = build_pointer_type (void_type_node);
3197 = build_pointer_type (build_type_variant (void_type_node, 1, 0));
3199 c_common_nodes_and_builtins (0, flag_no_builtin, flag_no_nonansi_builtin);
3201 endlink = void_list_node;
3202 ptr_ftype_void = build_function_type (ptr_type_node, endlink);
3204 = build_function_type (ptr_type_node,
3205 tree_cons (NULL_TREE, ptr_type_node, endlink));
3207 builtin_function ("__builtin_aggregate_incoming_address",
3208 build_function_type (ptr_type_node, NULL_TREE),
3209 BUILT_IN_AGGREGATE_INCOMING_ADDRESS, NULL_PTR);
3211 /* Hooks for the DWARF 2 __throw routine. */
3212 builtin_function ("__builtin_unwind_init",
3213 build_function_type (void_type_node, endlink),
3214 BUILT_IN_UNWIND_INIT, NULL_PTR);
3215 builtin_function ("__builtin_dwarf_cfa", ptr_ftype_void,
3216 BUILT_IN_DWARF_CFA, NULL_PTR);
3217 builtin_function ("__builtin_dwarf_fp_regnum",
3218 build_function_type (unsigned_type_node, endlink),
3219 BUILT_IN_DWARF_FP_REGNUM, NULL_PTR);
3220 builtin_function ("__builtin_dwarf_reg_size", int_ftype_int,
3221 BUILT_IN_DWARF_REG_SIZE, NULL_PTR);
3222 builtin_function ("__builtin_frob_return_addr", ptr_ftype_ptr,
3223 BUILT_IN_FROB_RETURN_ADDR, NULL_PTR);
3224 builtin_function ("__builtin_extract_return_addr", ptr_ftype_ptr,
3225 BUILT_IN_EXTRACT_RETURN_ADDR, NULL_PTR);
3227 ("__builtin_eh_return",
3228 build_function_type (void_type_node,
3229 tree_cons (NULL_TREE, ptr_type_node,
3230 tree_cons (NULL_TREE,
3231 type_for_mode (ptr_mode, 0),
3232 tree_cons (NULL_TREE,
3235 BUILT_IN_EH_RETURN, NULL_PTR);
3237 pedantic_lvalues = pedantic;
3239 /* Create the global bindings for __FUNCTION__ and __PRETTY_FUNCTION__. */
3240 declare_function_name ();
3242 start_identifier_warnings ();
3244 /* Prepare to check format strings against argument lists. */
3245 init_function_format_info ();
3249 incomplete_decl_finalize_hook = finish_incomplete_decl;
3251 lang_get_alias_set = c_get_alias_set;
3253 /* Record our roots. */
3255 ggc_add_tree_root (c_global_trees, CTI_MAX);
3256 ggc_add_tree_root (¤t_function_decl, 1);
3257 ggc_add_tree_root (&error_mark_node, 1);
3258 ggc_add_tree_root (&ptr_type_node, 1);
3259 ggc_add_tree_root (&va_list_type_node, 1);
3260 ggc_add_tree_root (&void_type_node, 1);
3261 ggc_add_tree_root (&char_type_node, 1);
3262 ggc_add_tree_root (&integer_type_node, 1);
3263 ggc_add_tree_root (&unsigned_type_node, 1);
3264 ggc_add_tree_root (&integer_one_node, 1);
3265 ggc_add_tree_root (&integer_zero_node, 1);
3266 ggc_add_tree_root (&named_labels, 1);
3267 ggc_add_tree_root (&null_pointer_node, 1);
3268 ggc_add_tree_root (&size_one_node, 1);
3269 ggc_add_tree_root (&size_zero_node, 1);
3270 ggc_add_tree_root (&shadowed_labels, 1);
3271 ggc_add_root (¤t_binding_level, 1, sizeof current_binding_level,
3272 mark_binding_level);
3273 ggc_add_root (&label_level_chain, 1, sizeof label_level_chain,
3274 mark_binding_level);
3275 ggc_add_tree_root (&static_ctors, 1);
3276 ggc_add_tree_root (&static_dtors, 1);
3279 /* Return a definition for a builtin function named NAME and whose data type
3280 is TYPE. TYPE should be a function type with argument types.
3281 FUNCTION_CODE tells later passes how to compile calls to this function.
3282 See tree.h for its possible values.
3284 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3285 the name to be called if we can't opencode the function. */
3288 builtin_function (name, type, function_code, library_name)
3291 enum built_in_function function_code;
3292 const char *library_name;
3294 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
3295 DECL_EXTERNAL (decl) = 1;
3296 TREE_PUBLIC (decl) = 1;
3297 /* If -traditional, permit redefining a builtin function any way you like.
3298 (Though really, if the program redefines these functions,
3299 it probably won't work right unless compiled with -fno-builtin.) */
3300 if (flag_traditional && name[0] != '_')
3301 DECL_BUILT_IN_NONANSI (decl) = 1;
3303 DECL_ASSEMBLER_NAME (decl) = get_identifier (library_name);
3304 make_decl_rtl (decl, NULL_PTR, 1);
3306 if (function_code != NOT_BUILT_IN)
3308 DECL_BUILT_IN (decl) = 1;
3309 DECL_FUNCTION_CODE (decl) = function_code;
3311 /* Warn if a function in the namespace for users
3312 is used without an occasion to consider it declared. */
3313 if (name[0] != '_' || name[1] != '_')
3314 C_DECL_ANTICIPATED (decl) = 1;
3319 /* Called when a declaration is seen that contains no names to declare.
3320 If its type is a reference to a structure, union or enum inherited
3321 from a containing scope, shadow that tag name for the current scope
3322 with a forward reference.
3323 If its type defines a new named structure or union
3324 or defines an enum, it is valid but we need not do anything here.
3325 Otherwise, it is an error. */
3328 shadow_tag (declspecs)
3331 shadow_tag_warned (declspecs, 0);
3335 shadow_tag_warned (declspecs, warned)
3338 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
3345 pending_invalid_xref = 0;
3347 /* Remove the attributes from declspecs, since they will confuse the
3349 split_specs_attrs (declspecs, &specs, &attrs);
3351 for (link = specs; link; link = TREE_CHAIN (link))
3353 register tree value = TREE_VALUE (link);
3354 register enum tree_code code = TREE_CODE (value);
3356 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
3357 /* Used to test also that TYPE_SIZE (value) != 0.
3358 That caused warning for `struct foo;' at top level in the file. */
3360 register tree name = lookup_tag_reverse (value);
3367 if (warned != 1 && code != ENUMERAL_TYPE)
3368 /* Empty unnamed enum OK */
3370 pedwarn ("unnamed struct/union that defines no instances");
3376 t = lookup_tag (code, name, current_binding_level, 1);
3380 t = make_node (code);
3387 if (!warned && ! in_system_header)
3389 warning ("useless keyword or type name in empty declaration");
3396 error ("two types specified in one empty declaration");
3401 pedwarn ("empty declaration");
3405 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3408 groktypename (typename)
3411 if (TREE_CODE (typename) != TREE_LIST)
3413 return grokdeclarator (TREE_VALUE (typename),
3414 TREE_PURPOSE (typename),
3418 /* Return a PARM_DECL node for a given pair of specs and declarator. */
3421 groktypename_in_parm_context (typename)
3424 if (TREE_CODE (typename) != TREE_LIST)
3426 return grokdeclarator (TREE_VALUE (typename),
3427 TREE_PURPOSE (typename),
3431 /* Decode a declarator in an ordinary declaration or data definition.
3432 This is called as soon as the type information and variable name
3433 have been parsed, before parsing the initializer if any.
3434 Here we create the ..._DECL node, fill in its type,
3435 and put it on the list of decls for the current context.
3436 The ..._DECL node is returned as the value.
3438 Exception: for arrays where the length is not specified,
3439 the type is left null, to be filled in by `finish_decl'.
3441 Function definitions do not come here; they go to start_function
3442 instead. However, external and forward declarations of functions
3443 do go through here. Structure field declarations are done by
3444 grokfield and not through here. */
3446 /* Set this to zero to debug not using the temporary obstack
3447 to parse initializers. */
3448 int debug_temp_inits = 1;
3451 start_decl (declarator, declspecs, initialized, attributes, prefix_attributes)
3452 tree declarator, declspecs;
3454 tree attributes, prefix_attributes;
3456 register tree decl = grokdeclarator (declarator, declspecs,
3457 NORMAL, initialized);
3459 int init_written = initialized;
3461 /* The corresponding pop_obstacks is in finish_decl. */
3462 push_obstacks_nochange ();
3464 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
3465 && !strcmp (IDENTIFIER_POINTER (DECL_NAME (decl)), "main"))
3466 warning_with_decl (decl, "`%s' is usually a function");
3469 /* Is it valid for this decl to have an initializer at all?
3470 If not, set INITIALIZED to zero, which will indirectly
3471 tell `finish_decl' to ignore the initializer once it is parsed. */
3472 switch (TREE_CODE (decl))
3475 /* typedef foo = bar means give foo the same type as bar.
3476 We haven't parsed bar yet, so `finish_decl' will fix that up.
3477 Any other case of an initialization in a TYPE_DECL is an error. */
3478 if (pedantic || list_length (declspecs) > 1)
3480 error ("typedef `%s' is initialized",
3481 IDENTIFIER_POINTER (DECL_NAME (decl)));
3487 error ("function `%s' is initialized like a variable",
3488 IDENTIFIER_POINTER (DECL_NAME (decl)));
3493 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3494 error ("parameter `%s' is initialized",
3495 IDENTIFIER_POINTER (DECL_NAME (decl)));
3500 /* Don't allow initializations for incomplete types
3501 except for arrays which might be completed by the initialization. */
3502 if (TYPE_SIZE (TREE_TYPE (decl)) != 0)
3504 /* A complete type is ok if size is fixed. */
3506 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3507 || C_DECL_VARIABLE_SIZE (decl))
3509 error ("variable-sized object may not be initialized");
3513 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3515 error ("variable `%s' has initializer but incomplete type",
3516 IDENTIFIER_POINTER (DECL_NAME (decl)));
3519 else if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl))) == 0)
3521 error ("elements of array `%s' have incomplete type",
3522 IDENTIFIER_POINTER (DECL_NAME (decl)));
3529 #if 0 /* Seems redundant with grokdeclarator. */
3530 if (current_binding_level != global_binding_level
3531 && DECL_EXTERNAL (decl)
3532 && TREE_CODE (decl) != FUNCTION_DECL)
3533 warning ("declaration of `%s' has `extern' and is initialized",
3534 IDENTIFIER_POINTER (DECL_NAME (decl)));
3536 DECL_EXTERNAL (decl) = 0;
3537 if (current_binding_level == global_binding_level)
3538 TREE_STATIC (decl) = 1;
3540 /* Tell `pushdecl' this is an initialized decl
3541 even though we don't yet have the initializer expression.
3542 Also tell `finish_decl' it may store the real initializer. */
3543 DECL_INITIAL (decl) = error_mark_node;
3546 /* If this is a function declaration, write a record describing it to the
3547 prototypes file (if requested). */
3549 if (TREE_CODE (decl) == FUNCTION_DECL)
3550 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3552 /* ANSI specifies that a tentative definition which is not merged with
3553 a non-tentative definition behaves exactly like a definition with an
3554 initializer equal to zero. (Section 3.7.2)
3555 -fno-common gives strict ANSI behavior. Usually you don't want it.
3556 This matters only for variables with external linkage. */
3557 if (! flag_no_common || ! TREE_PUBLIC (decl))
3558 DECL_COMMON (decl) = 1;
3560 #ifdef SET_DEFAULT_DECL_ATTRIBUTES
3561 SET_DEFAULT_DECL_ATTRIBUTES (decl, attributes);
3564 /* Set attributes here so if duplicate decl, will have proper attributes. */
3565 decl_attributes (decl, attributes, prefix_attributes);
3567 /* Add this decl to the current binding level.
3568 TEM may equal DECL or it may be a previous decl of the same name. */
3569 tem = pushdecl (decl);
3571 /* For a local variable, define the RTL now. */
3572 if (current_binding_level != global_binding_level
3573 /* But not if this is a duplicate decl
3574 and we preserved the rtl from the previous one
3575 (which may or may not happen). */
3576 && DECL_RTL (tem) == 0)
3578 if (TYPE_SIZE (TREE_TYPE (tem)) != 0)
3580 else if (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
3581 && DECL_INITIAL (tem) != 0)
3587 /* When parsing and digesting the initializer,
3588 use temporary storage. Do this even if we will ignore the value. */
3589 if (current_binding_level == global_binding_level && debug_temp_inits)
3590 temporary_allocation ();
3596 /* Finish processing of a declaration;
3597 install its initial value.
3598 If the length of an array type is not known before,
3599 it must be determined now, from the initial value, or it is an error. */
3602 finish_decl (decl, init, asmspec_tree)
3606 register tree type = TREE_TYPE (decl);
3607 int was_incomplete = (DECL_SIZE (decl) == 0);
3608 int temporary = allocation_temporary_p ();
3611 /* If a name was specified, get the string. */
3613 asmspec = TREE_STRING_POINTER (asmspec_tree);
3615 /* If `start_decl' didn't like having an initialization, ignore it now. */
3617 if (init != 0 && DECL_INITIAL (decl) == 0)
3619 /* Don't crash if parm is initialized. */
3620 if (TREE_CODE (decl) == PARM_DECL)
3623 if (ITERATOR_P (decl))
3626 error_with_decl (decl, "iterator has no initial value");
3628 init = save_expr (init);
3633 if (TREE_CODE (decl) != TYPE_DECL)
3634 store_init_value (decl, init);
3637 /* typedef foo = bar; store the type of bar as the type of foo. */
3638 TREE_TYPE (decl) = TREE_TYPE (init);
3639 DECL_INITIAL (decl) = init = 0;
3643 /* Pop back to the obstack that is current for this binding level.
3644 This is because MAXINDEX, rtl, etc. to be made below
3645 must go in the permanent obstack. But don't discard the
3646 temporary data yet. */
3648 #if 0 /* pop_obstacks was near the end; this is what was here. */
3649 if (current_binding_level == global_binding_level && temporary)
3650 end_temporary_allocation ();
3653 /* Deduce size of array from initialization, if not already known */
3655 if (TREE_CODE (type) == ARRAY_TYPE
3656 && TYPE_DOMAIN (type) == 0
3657 && TREE_CODE (decl) != TYPE_DECL)
3660 = (TREE_STATIC (decl)
3661 /* Even if pedantic, an external linkage array
3662 may have incomplete type at first. */
3663 ? pedantic && !TREE_PUBLIC (decl)
3664 : !DECL_EXTERNAL (decl));
3666 = complete_array_type (type, DECL_INITIAL (decl), do_default);
3668 /* Get the completed type made by complete_array_type. */
3669 type = TREE_TYPE (decl);
3672 error_with_decl (decl, "initializer fails to determine size of `%s'");
3677 error_with_decl (decl, "array size missing in `%s'");
3678 /* If a `static' var's size isn't known,
3679 make it extern as well as static, so it does not get
3681 If it is not `static', then do not mark extern;
3682 finish_incomplete_decl will give it a default size
3683 and it will get allocated. */
3684 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
3685 DECL_EXTERNAL (decl) = 1;
3688 /* TYPE_MAX_VALUE is always one less than the number of elements
3689 in the array, because we start counting at zero. Therefore,
3690 warn only if the value is less than zero. */
3691 if (pedantic && TYPE_DOMAIN (type) != 0
3692 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
3693 error_with_decl (decl, "zero or negative size array `%s'");
3695 layout_decl (decl, 0);
3698 if (TREE_CODE (decl) == VAR_DECL)
3700 if (DECL_SIZE (decl) == 0
3701 && TYPE_SIZE (TREE_TYPE (decl)) != 0)
3702 layout_decl (decl, 0);
3704 if (DECL_SIZE (decl) == 0
3705 && (TREE_STATIC (decl)
3707 /* A static variable with an incomplete type
3708 is an error if it is initialized.
3709 Also if it is not file scope.
3710 Otherwise, let it through, but if it is not `extern'
3711 then it may cause an error message later. */
3712 /* A duplicate_decls call could have changed an extern
3713 declaration into a file scope one. This can be detected
3714 by TREE_ASM_WRITTEN being set. */
3715 (DECL_INITIAL (decl) != 0
3716 || (DECL_CONTEXT (decl) != 0 && ! TREE_ASM_WRITTEN (decl)))
3718 /* An automatic variable with an incomplete type
3720 !DECL_EXTERNAL (decl)))
3722 error_with_decl (decl, "storage size of `%s' isn't known");
3723 TREE_TYPE (decl) = error_mark_node;
3726 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
3727 && DECL_SIZE (decl) != 0)
3729 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
3730 constant_expression_warning (DECL_SIZE (decl));
3732 error_with_decl (decl, "storage size of `%s' isn't constant");
3735 if (TREE_USED (type))
3736 TREE_USED (decl) = 1;
3739 /* If this is a function and an assembler name is specified, it isn't
3740 builtin any more. Also reset DECL_RTL so we can give it its new
3742 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
3744 DECL_BUILT_IN (decl) = 0;
3745 DECL_RTL (decl) = 0;
3746 DECL_ASSEMBLER_NAME (decl) = get_identifier (asmspec);
3749 /* Output the assembler code and/or RTL code for variables and functions,
3750 unless the type is an undefined structure or union.
3751 If not, it will get done when the type is completed. */
3753 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
3755 if ((flag_traditional || TREE_PERMANENT (decl))
3756 && allocation_temporary_p ())
3758 push_obstacks_nochange ();
3759 end_temporary_allocation ();
3760 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3761 maybe_objc_check_decl (decl);
3762 rest_of_decl_compilation (decl, asmspec,
3763 (DECL_CONTEXT (decl) == 0
3764 || TREE_ASM_WRITTEN (decl)),
3770 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3771 maybe_objc_check_decl (decl);
3772 rest_of_decl_compilation (decl, asmspec, DECL_CONTEXT (decl) == 0,
3775 if (DECL_CONTEXT (decl) != 0)
3777 /* Recompute the RTL of a local array now
3778 if it used to be an incomplete type. */
3780 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
3782 /* If we used it already as memory, it must stay in memory. */
3783 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
3784 /* If it's still incomplete now, no init will save it. */
3785 if (DECL_SIZE (decl) == 0)
3786 DECL_INITIAL (decl) = 0;
3789 /* Compute and store the initial value. */
3790 if (TREE_CODE (decl) != FUNCTION_DECL)
3791 expand_decl_init (decl);
3795 if (TREE_CODE (decl) == TYPE_DECL)
3797 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
3798 maybe_objc_check_decl (decl);
3799 rest_of_decl_compilation (decl, NULL_PTR, DECL_CONTEXT (decl) == 0,
3803 /* ??? After 2.3, test (init != 0) instead of TREE_CODE. */
3804 /* This test used to include TREE_PERMANENT, however, we have the same
3805 problem with initializers at the function level. Such initializers get
3806 saved until the end of the function on the momentary_obstack. */
3807 if (!(TREE_CODE (decl) == FUNCTION_DECL && DECL_INLINE (decl))
3809 /* DECL_INITIAL is not defined in PARM_DECLs, since it shares
3810 space with DECL_ARG_TYPE. */
3811 && TREE_CODE (decl) != PARM_DECL)
3813 /* We need to remember that this array HAD an initialization,
3814 but discard the actual temporary nodes,
3815 since we can't have a permanent node keep pointing to them. */
3816 /* We make an exception for inline functions, since it's
3817 normal for a local extern redeclaration of an inline function
3818 to have a copy of the top-level decl's DECL_INLINE. */
3819 if (DECL_INITIAL (decl) != 0 && DECL_INITIAL (decl) != error_mark_node)
3821 /* If this is a const variable, then preserve the
3822 initializer instead of discarding it so that we can optimize
3823 references to it. */
3824 /* This test used to include TREE_STATIC, but this won't be set
3825 for function level initializers. */
3826 if (TREE_READONLY (decl) || ITERATOR_P (decl))
3828 preserve_initializer ();
3829 /* Hack? Set the permanent bit for something that is permanent,
3830 but not on the permanent obstack, so as to convince
3831 output_constant_def to make its rtl on the permanent
3833 TREE_PERMANENT (DECL_INITIAL (decl)) = 1;
3835 /* The initializer and DECL must have the same (or equivalent
3836 types), but if the initializer is a STRING_CST, its type
3837 might not be on the right obstack, so copy the type
3839 TREE_TYPE (DECL_INITIAL (decl)) = type;
3842 DECL_INITIAL (decl) = error_mark_node;
3846 /* If requested, warn about definitions of large data objects. */
3848 if (warn_larger_than
3849 && (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == PARM_DECL)
3850 && !DECL_EXTERNAL (decl))
3852 register tree decl_size = DECL_SIZE (decl);
3854 if (decl_size && TREE_CODE (decl_size) == INTEGER_CST)
3856 unsigned units = TREE_INT_CST_LOW(decl_size) / BITS_PER_UNIT;
3858 if (units > larger_than_size)
3859 warning_with_decl (decl, "size of `%s' is %u bytes", units);
3864 /* Resume permanent allocation, if not within a function. */
3865 /* The corresponding push_obstacks_nochange is in start_decl,
3866 and in push_parm_decl and in grokfield. */
3870 /* If we have gone back from temporary to permanent allocation,
3871 actually free the temporary space that we no longer need. */
3872 if (temporary && !allocation_temporary_p ())
3873 permanent_allocation (0);
3875 /* At the end of a declaration, throw away any variable type sizes
3876 of types defined inside that declaration. There is no use
3877 computing them in the following function definition. */
3878 if (current_binding_level == global_binding_level)
3879 get_pending_sizes ();
3882 /* If DECL has a cleanup, build and return that cleanup here.
3883 This is a callback called by expand_expr. */
3886 maybe_build_cleanup (decl)
3887 tree decl ATTRIBUTE_UNUSED;
3889 /* There are no cleanups in C. */
3893 /* Given a parsed parameter declaration,
3894 decode it into a PARM_DECL and push that on the current binding level.
3895 Also, for the sake of forward parm decls,
3896 record the given order of parms in `parm_order'. */
3899 push_parm_decl (parm)
3903 int old_immediate_size_expand = immediate_size_expand;
3904 /* Don't try computing parm sizes now -- wait till fn is called. */
3905 immediate_size_expand = 0;
3907 /* The corresponding pop_obstacks is in finish_decl. */
3908 push_obstacks_nochange ();
3910 decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
3911 TREE_PURPOSE (TREE_PURPOSE (parm)), PARM, 0);
3912 decl_attributes (decl, TREE_VALUE (TREE_VALUE (parm)),
3913 TREE_PURPOSE (TREE_VALUE (parm)));
3916 if (DECL_NAME (decl))
3919 olddecl = lookup_name (DECL_NAME (decl));
3920 if (pedantic && olddecl != 0 && TREE_CODE (olddecl) == TYPE_DECL)
3921 pedwarn_with_decl (decl, "ANSI C forbids parameter `%s' shadowing typedef");
3925 decl = pushdecl (decl);
3927 immediate_size_expand = old_immediate_size_expand;
3929 current_binding_level->parm_order
3930 = tree_cons (NULL_TREE, decl, current_binding_level->parm_order);
3932 /* Add this decl to the current binding level. */
3933 finish_decl (decl, NULL_TREE, NULL_TREE);
3936 /* Clear the given order of parms in `parm_order'.
3937 Used at start of parm list,
3938 and also at semicolon terminating forward decls. */
3943 current_binding_level->parm_order = NULL_TREE;
3946 /* Make TYPE a complete type based on INITIAL_VALUE.
3947 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
3948 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
3951 complete_array_type (type, initial_value, do_default)
3956 register tree maxindex = NULL_TREE;
3961 /* Note MAXINDEX is really the maximum index,
3962 one less than the size. */
3963 if (TREE_CODE (initial_value) == STRING_CST)
3966 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
3967 maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
3970 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
3972 tree elts = CONSTRUCTOR_ELTS (initial_value);
3973 maxindex = size_binop (MINUS_EXPR, integer_zero_node, size_one_node);
3974 for (; elts; elts = TREE_CHAIN (elts))
3976 if (TREE_PURPOSE (elts))
3977 maxindex = TREE_PURPOSE (elts);
3979 maxindex = size_binop (PLUS_EXPR, maxindex, size_one_node);
3981 maxindex = copy_node (maxindex);
3985 /* Make an error message unless that happened already. */
3986 if (initial_value != error_mark_node)
3989 /* Prevent further error messages. */
3990 maxindex = build_int_2 (0, 0);
3997 maxindex = build_int_2 (0, 0);
4003 TYPE_DOMAIN (type) = build_index_type (maxindex);
4004 if (!TREE_TYPE (maxindex))
4005 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
4008 /* Lay out the type now that we can get the real answer. */
4015 /* Given declspecs and a declarator,
4016 determine the name and type of the object declared
4017 and construct a ..._DECL node for it.
4018 (In one case we can return a ..._TYPE node instead.
4019 For invalid input we sometimes return 0.)
4021 DECLSPECS is a chain of tree_list nodes whose value fields
4022 are the storage classes and type specifiers.
4024 DECL_CONTEXT says which syntactic context this declaration is in:
4025 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
4026 FUNCDEF for a function definition. Like NORMAL but a few different
4027 error messages in each case. Return value may be zero meaning
4028 this definition is too screwy to try to parse.
4029 PARM for a parameter declaration (either within a function prototype
4030 or before a function body). Make a PARM_DECL, or return void_type_node.
4031 TYPENAME if for a typename (in a cast or sizeof).
4032 Don't make a DECL node; just return the ..._TYPE node.
4033 FIELD for a struct or union field; make a FIELD_DECL.
4034 BITFIELD for a field with specified width.
4035 INITIALIZED is 1 if the decl has an initializer.
4037 In the TYPENAME case, DECLARATOR is really an absolute declarator.
4038 It may also be so in the PARM case, for a prototype where the
4039 argument type is specified but not the name.
4041 This function is where the complicated C meanings of `static'
4042 and `extern' are interpreted. */
4045 grokdeclarator (declarator, declspecs, decl_context, initialized)
4048 enum decl_context decl_context;
4053 tree type = NULL_TREE;
4058 int type_quals = TYPE_UNQUALIFIED;
4060 int explicit_int = 0;
4061 int explicit_char = 0;
4062 int defaulted_int = 0;
4063 tree typedef_decl = 0;
4065 tree typedef_type = 0;
4066 int funcdef_flag = 0;
4067 enum tree_code innermost_code = ERROR_MARK;
4069 int size_varies = 0;
4070 tree decl_machine_attr = NULL_TREE;
4072 if (decl_context == BITFIELD)
4073 bitfield = 1, decl_context = FIELD;
4075 if (decl_context == FUNCDEF)
4076 funcdef_flag = 1, decl_context = NORMAL;
4078 push_obstacks_nochange ();
4080 if (flag_traditional && allocation_temporary_p ())
4081 end_temporary_allocation ();
4083 /* Look inside a declarator for the name being declared
4084 and get it as a string, for an error message. */
4086 register tree decl = declarator;
4090 switch (TREE_CODE (decl))
4095 innermost_code = TREE_CODE (decl);
4096 decl = TREE_OPERAND (decl, 0);
4099 case IDENTIFIER_NODE:
4100 name = IDENTIFIER_POINTER (decl);
4111 /* A function definition's declarator must have the form of
4112 a function declarator. */
4114 if (funcdef_flag && innermost_code != CALL_EXPR)
4117 /* Anything declared one level down from the top level
4118 must be one of the parameters of a function
4119 (because the body is at least two levels down). */
4121 /* If this looks like a function definition, make it one,
4122 even if it occurs where parms are expected.
4123 Then store_parm_decls will reject it and not use it as a parm. */
4124 if (decl_context == NORMAL && !funcdef_flag
4125 && current_binding_level->parm_flag)
4126 decl_context = PARM;
4128 /* Look through the decl specs and record which ones appear.
4129 Some typespecs are defined as built-in typenames.
4130 Others, the ones that are modifiers of other types,
4131 are represented by bits in SPECBITS: set the bits for
4132 the modifiers that appear. Storage class keywords are also in SPECBITS.
4134 If there is a typedef name or a type, store the type in TYPE.
4135 This includes builtin typedefs such as `int'.
4137 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
4138 and did not come from a user typedef.
4140 Set LONGLONG if `long' is mentioned twice. */
4142 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
4145 register tree id = TREE_VALUE (spec);
4147 if (id == ridpointers[(int) RID_INT])
4149 if (id == ridpointers[(int) RID_CHAR])
4152 if (TREE_CODE (id) == IDENTIFIER_NODE)
4153 for (i = (int) RID_FIRST_MODIFIER; i < (int) RID_MAX; i++)
4155 if (ridpointers[i] == id)
4157 if (i == (int) RID_LONG && specbits & (1<<i))
4160 error ("`long long long' is too long for GCC");
4163 if (pedantic && ! in_system_header && warn_long_long)
4164 pedwarn ("ANSI C does not support `long long'");
4168 else if (specbits & (1 << i))
4169 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
4175 error ("two or more data types in declaration of `%s'", name);
4176 /* Actual typedefs come to us as TYPE_DECL nodes. */
4177 else if (TREE_CODE (id) == TYPE_DECL)
4179 type = TREE_TYPE (id);
4180 decl_machine_attr = DECL_MACHINE_ATTRIBUTES (id);
4183 /* Built-in types come as identifiers. */
4184 else if (TREE_CODE (id) == IDENTIFIER_NODE)
4186 register tree t = lookup_name (id);
4187 if (TREE_TYPE (t) == error_mark_node)
4189 else if (!t || TREE_CODE (t) != TYPE_DECL)
4190 error ("`%s' fails to be a typedef or built in type",
4191 IDENTIFIER_POINTER (id));
4194 type = TREE_TYPE (t);
4198 else if (TREE_CODE (id) != ERROR_MARK)
4204 typedef_type = type;
4206 size_varies = C_TYPE_VARIABLE_SIZE (type);
4208 /* No type at all: default to `int', and set DEFAULTED_INT
4209 because it was not a user-defined typedef. */
4213 if ((! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4214 | (1 << (int) RID_SIGNED)
4215 | (1 << (int) RID_UNSIGNED))))
4216 /* Don't warn about typedef foo = bar. */
4217 && ! (specbits & (1 << (int) RID_TYPEDEF) && initialized)
4218 && ! (in_system_header && ! allocation_temporary_p ()))
4220 /* Issue a warning if this is an ISO C 9x program or if -Wreturn-type
4221 and this is a function, or if -Wimplicit; prefer the former
4222 warning since it is more explicit. */
4223 if ((warn_implicit_int || warn_return_type) && funcdef_flag)
4224 warn_about_return_type = 1;
4225 else if (warn_implicit_int || flag_isoc9x)
4226 warning ("type defaults to `int' in declaration of `%s'", name);
4230 type = integer_type_node;
4233 /* Now process the modifiers that were specified
4234 and check for invalid combinations. */
4236 /* Long double is a special combination. */
4238 if ((specbits & 1 << (int) RID_LONG) && ! longlong
4239 && TYPE_MAIN_VARIANT (type) == double_type_node)
4241 specbits &= ~ (1 << (int) RID_LONG);
4242 type = long_double_type_node;
4245 /* Check all other uses of type modifiers. */
4247 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4248 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
4252 if ((specbits & 1 << (int) RID_LONG)
4253 && (specbits & 1 << (int) RID_SHORT))
4254 error ("both long and short specified for `%s'", name);
4255 else if (((specbits & 1 << (int) RID_LONG)
4256 || (specbits & 1 << (int) RID_SHORT))
4258 error ("long or short specified with char for `%s'", name);
4259 else if (((specbits & 1 << (int) RID_LONG)
4260 || (specbits & 1 << (int) RID_SHORT))
4261 && TREE_CODE (type) == REAL_TYPE)
4263 static int already = 0;
4265 error ("long or short specified with floating type for `%s'", name);
4266 if (! already && ! pedantic)
4268 error ("the only valid combination is `long double'");
4272 else if ((specbits & 1 << (int) RID_SIGNED)
4273 && (specbits & 1 << (int) RID_UNSIGNED))
4274 error ("both signed and unsigned specified for `%s'", name);
4275 else if (TREE_CODE (type) != INTEGER_TYPE)
4276 error ("long, short, signed or unsigned invalid for `%s'", name);
4280 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
4282 pedwarn ("long, short, signed or unsigned used invalidly for `%s'",
4284 if (flag_pedantic_errors)
4289 /* Discard the type modifiers if they are invalid. */
4292 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4293 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
4298 if ((specbits & (1 << (int) RID_COMPLEX))
4299 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
4301 error ("complex invalid for `%s'", name);
4302 specbits &= ~ (1 << (int) RID_COMPLEX);
4305 /* Decide whether an integer type is signed or not.
4306 Optionally treat bitfields as signed by default. */
4307 if (specbits & 1 << (int) RID_UNSIGNED
4308 /* Traditionally, all bitfields are unsigned. */
4309 || (bitfield && flag_traditional
4310 && (! explicit_flag_signed_bitfields || !flag_signed_bitfields))
4311 || (bitfield && ! flag_signed_bitfields
4312 && (explicit_int || defaulted_int || explicit_char
4313 /* A typedef for plain `int' without `signed'
4314 can be controlled just like plain `int'. */
4315 || ! (typedef_decl != 0
4316 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4317 && TREE_CODE (type) != ENUMERAL_TYPE
4318 && !(specbits & 1 << (int) RID_SIGNED)))
4321 type = long_long_unsigned_type_node;
4322 else if (specbits & 1 << (int) RID_LONG)
4323 type = long_unsigned_type_node;
4324 else if (specbits & 1 << (int) RID_SHORT)
4325 type = short_unsigned_type_node;
4326 else if (type == char_type_node)
4327 type = unsigned_char_type_node;
4328 else if (typedef_decl)
4329 type = unsigned_type (type);
4331 type = unsigned_type_node;
4333 else if ((specbits & 1 << (int) RID_SIGNED)
4334 && type == char_type_node)
4335 type = signed_char_type_node;
4337 type = long_long_integer_type_node;
4338 else if (specbits & 1 << (int) RID_LONG)
4339 type = long_integer_type_node;
4340 else if (specbits & 1 << (int) RID_SHORT)
4341 type = short_integer_type_node;
4343 if (specbits & 1 << (int) RID_COMPLEX)
4345 /* If we just have "complex", it is equivalent to
4346 "complex double", but if any modifiers at all are specified it is
4347 the complex form of TYPE. E.g, "complex short" is
4348 "complex short int". */
4350 if (defaulted_int && ! longlong
4351 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4352 | (1 << (int) RID_SIGNED)
4353 | (1 << (int) RID_UNSIGNED))))
4354 type = complex_double_type_node;
4355 else if (type == integer_type_node)
4356 type = complex_integer_type_node;
4357 else if (type == float_type_node)
4358 type = complex_float_type_node;
4359 else if (type == double_type_node)
4360 type = complex_double_type_node;
4361 else if (type == long_double_type_node)
4362 type = complex_long_double_type_node;
4364 type = build_complex_type (type);
4367 /* Figure out the type qualifiers for the declaration. There are
4368 two ways a declaration can become qualified. One is something
4369 like `const int i' where the `const' is explicit. Another is
4370 something like `typedef const int CI; CI i' where the type of the
4371 declaration contains the `const'. */
4372 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
4373 restrictp = !! (specbits & 1 << (int) RID_RESTRICT) + TYPE_RESTRICT (type);
4374 volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
4375 inlinep = !! (specbits & (1 << (int) RID_INLINE));
4377 pedwarn ("duplicate `const'");
4379 pedwarn ("duplicate `restrict'");
4381 pedwarn ("duplicate `volatile'");
4382 if (! flag_gen_aux_info && (TYPE_QUALS (type)))
4383 type = TYPE_MAIN_VARIANT (type);
4384 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4385 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4386 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4388 /* Warn if two storage classes are given. Default to `auto'. */
4393 if (specbits & 1 << (int) RID_AUTO) nclasses++;
4394 if (specbits & 1 << (int) RID_STATIC) nclasses++;
4395 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
4396 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
4397 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
4398 if (specbits & 1 << (int) RID_ITERATOR) nclasses++;
4400 /* Warn about storage classes that are invalid for certain
4401 kinds of declarations (parameters, typenames, etc.). */
4404 error ("multiple storage classes in declaration of `%s'", name);
4405 else if (funcdef_flag
4407 & ((1 << (int) RID_REGISTER)
4408 | (1 << (int) RID_AUTO)
4409 | (1 << (int) RID_TYPEDEF))))
4411 if (specbits & 1 << (int) RID_AUTO
4412 && (pedantic || current_binding_level == global_binding_level))
4413 pedwarn ("function definition declared `auto'");
4414 if (specbits & 1 << (int) RID_REGISTER)
4415 error ("function definition declared `register'");
4416 if (specbits & 1 << (int) RID_TYPEDEF)
4417 error ("function definition declared `typedef'");
4418 specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4419 | (1 << (int) RID_AUTO));
4421 else if (decl_context != NORMAL && nclasses > 0)
4423 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
4427 error ((decl_context == FIELD
4428 ? "storage class specified for structure field `%s'"
4429 : (decl_context == PARM
4430 ? "storage class specified for parameter `%s'"
4431 : "storage class specified for typename")),
4433 specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4434 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
4435 | (1 << (int) RID_EXTERN));
4438 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
4440 /* `extern' with initialization is invalid if not at top level. */
4441 if (current_binding_level == global_binding_level)
4442 warning ("`%s' initialized and declared `extern'", name);
4444 error ("`%s' has both `extern' and initializer", name);
4446 else if (specbits & 1 << (int) RID_EXTERN && funcdef_flag
4447 && current_binding_level != global_binding_level)
4448 error ("nested function `%s' declared `extern'", name);
4449 else if (current_binding_level == global_binding_level
4450 && specbits & (1 << (int) RID_AUTO))
4451 error ("top-level declaration of `%s' specifies `auto'", name);
4452 else if ((specbits & 1 << (int) RID_ITERATOR)
4453 && TREE_CODE (declarator) != IDENTIFIER_NODE)
4455 error ("iterator `%s' has derived type", name);
4456 type = error_mark_node;
4458 else if ((specbits & 1 << (int) RID_ITERATOR)
4459 && TREE_CODE (type) != INTEGER_TYPE)
4461 error ("iterator `%s' has noninteger type", name);
4462 type = error_mark_node;
4466 /* Now figure out the structure of the declarator proper.
4467 Descend through it, creating more complex types, until we reach
4468 the declared identifier (or NULL_TREE, in an absolute declarator). */
4470 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
4472 if (type == error_mark_node)
4474 declarator = TREE_OPERAND (declarator, 0);
4478 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
4479 an INDIRECT_REF (for *...),
4480 a CALL_EXPR (for ...(...)),
4481 an identifier (for the name being declared)
4482 or a null pointer (for the place in an absolute declarator
4483 where the name was omitted).
4484 For the last two cases, we have just exited the loop.
4486 At this point, TYPE is the type of elements of an array,
4487 or for a function to return, or for a pointer to point to.
4488 After this sequence of ifs, TYPE is the type of the
4489 array or function or pointer, and DECLARATOR has had its
4490 outermost layer removed. */
4492 if (TREE_CODE (declarator) == ARRAY_REF)
4494 register tree itype = NULL_TREE;
4495 register tree size = TREE_OPERAND (declarator, 1);
4496 /* An uninitialized decl with `extern' is a reference. */
4497 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4498 /* The index is a signed object `sizetype' bits wide. */
4499 tree index_type = signed_type (sizetype);
4501 declarator = TREE_OPERAND (declarator, 0);
4503 /* Check for some types that there cannot be arrays of. */
4505 if (TYPE_MAIN_VARIANT (type) == void_type_node)
4507 error ("declaration of `%s' as array of voids", name);
4508 type = error_mark_node;
4511 if (TREE_CODE (type) == FUNCTION_TYPE)
4513 error ("declaration of `%s' as array of functions", name);
4514 type = error_mark_node;
4517 if (size == error_mark_node)
4518 type = error_mark_node;
4520 if (type == error_mark_node)
4523 /* If this is a block level extern, it must live past the end
4524 of the function so that we can check it against other extern
4525 declarations (IDENTIFIER_LIMBO_VALUE). */
4526 if (extern_ref && allocation_temporary_p ())
4527 end_temporary_allocation ();
4529 /* If size was specified, set ITYPE to a range-type for that size.
4530 Otherwise, ITYPE remains null. finish_decl may figure it out
4531 from an initial value. */
4535 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4536 STRIP_TYPE_NOPS (size);
4538 if (TREE_CODE (TREE_TYPE (size)) != INTEGER_TYPE
4539 && TREE_CODE (TREE_TYPE (size)) != ENUMERAL_TYPE)
4541 error ("size of array `%s' has non-integer type", name);
4542 size = integer_one_node;
4545 if (pedantic && integer_zerop (size))
4546 pedwarn ("ANSI C forbids zero-size array `%s'", name);
4548 if (TREE_CODE (size) == INTEGER_CST)
4550 constant_expression_warning (size);
4551 if (tree_int_cst_sgn (size) < 0)
4553 error ("size of array `%s' is negative", name);
4554 size = integer_one_node;
4559 /* Make sure the array size remains visibly nonconstant
4560 even if it is (eg) a const variable with known value. */
4565 if (TREE_CONSTANT (size))
4566 pedwarn ("ANSI C forbids array `%s' whose size can't be evaluated", name);
4568 pedwarn ("ANSI C forbids variable-size array `%s'", name);
4572 /* Convert size to index_type, so that if it is a variable
4573 the computations will be done in the proper mode. */
4574 itype = fold (build (MINUS_EXPR, index_type,
4575 convert (index_type, size),
4576 convert (index_type, size_one_node)));
4578 /* If that overflowed, the array is too big.
4579 ??? While a size of INT_MAX+1 technically shouldn't cause
4580 an overflow (because we subtract 1), the overflow is recorded
4581 during the conversion to index_type, before the subtraction.
4582 Handling this case seems like an unnecessary complication. */
4583 if (TREE_OVERFLOW (itype))
4585 error ("size of array `%s' is too large", name);
4586 type = error_mark_node;
4591 itype = variable_size (itype);
4592 itype = build_index_type (itype);
4595 #if 0 /* This had bad results for pointers to arrays, as in
4596 union incomplete (*foo)[4]; */
4597 /* Complain about arrays of incomplete types, except in typedefs. */
4599 if (TYPE_SIZE (type) == 0
4600 /* Avoid multiple warnings for nested array types. */
4601 && TREE_CODE (type) != ARRAY_TYPE
4602 && !(specbits & (1 << (int) RID_TYPEDEF))
4603 && !C_TYPE_BEING_DEFINED (type))
4604 warning ("array type has incomplete element type");
4607 #if 0 /* We shouldn't have a function type here at all!
4608 Functions aren't allowed as array elements. */
4609 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4610 && (constp || volatilep))
4611 pedwarn ("ANSI C forbids const or volatile function types");
4614 /* Build the array type itself, then merge any constancy or
4615 volatility into the target type. We must do it in this order
4616 to ensure that the TYPE_MAIN_VARIANT field of the array type
4617 is set correctly. */
4619 type = build_array_type (type, itype);
4621 type = c_build_qualified_type (type, type_quals);
4623 #if 0 /* don't clear these; leave them set so that the array type
4624 or the variable is itself const or volatile. */
4625 type_quals = TYPE_UNQUALIFIED;
4629 C_TYPE_VARIABLE_SIZE (type) = 1;
4631 else if (TREE_CODE (declarator) == CALL_EXPR)
4633 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4634 || current_binding_level == global_binding_level);
4637 /* Declaring a function type.
4638 Make sure we have a valid type for the function to return. */
4639 if (type == error_mark_node)
4644 /* Warn about some types functions can't return. */
4646 if (TREE_CODE (type) == FUNCTION_TYPE)
4648 error ("`%s' declared as function returning a function", name);
4649 type = integer_type_node;
4651 if (TREE_CODE (type) == ARRAY_TYPE)
4653 error ("`%s' declared as function returning an array", name);
4654 type = integer_type_node;
4657 #ifndef TRADITIONAL_RETURN_FLOAT
4658 /* Traditionally, declaring return type float means double. */
4660 if (flag_traditional && TYPE_MAIN_VARIANT (type) == float_type_node)
4661 type = double_type_node;
4662 #endif /* TRADITIONAL_RETURN_FLOAT */
4664 /* If this is a block level extern, it must live past the end
4665 of the function so that we can check it against other extern
4666 declarations (IDENTIFIER_LIMBO_VALUE). */
4667 if (extern_ref && allocation_temporary_p ())
4668 end_temporary_allocation ();
4670 /* Construct the function type and go to the next
4671 inner layer of declarator. */
4673 arg_types = grokparms (TREE_OPERAND (declarator, 1),
4675 /* Say it's a definition
4676 only for the CALL_EXPR
4677 closest to the identifier. */
4678 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
4679 #if 0 /* This seems to be false. We turn off temporary allocation
4680 above in this function if -traditional.
4681 And this code caused inconsistent results with prototypes:
4682 callers would ignore them, and pass arguments wrong. */
4684 /* Omit the arg types if -traditional, since the arg types
4685 and the list links might not be permanent. */
4686 type = build_function_type (type,
4688 ? NULL_TREE : arg_types);
4690 /* Type qualifiers before the return type of the function
4691 qualify the return type, not the function type. */
4693 type = c_build_qualified_type (type, type_quals);
4694 type_quals = TYPE_UNQUALIFIED;
4696 type = build_function_type (type, arg_types);
4697 declarator = TREE_OPERAND (declarator, 0);
4699 /* Set the TYPE_CONTEXTs for each tagged type which is local to
4700 the formal parameter list of this FUNCTION_TYPE to point to
4701 the FUNCTION_TYPE node itself. */
4706 for (link = last_function_parm_tags;
4708 link = TREE_CHAIN (link))
4709 TYPE_CONTEXT (TREE_VALUE (link)) = type;
4712 else if (TREE_CODE (declarator) == INDIRECT_REF)
4714 /* Merge any constancy or volatility into the target type
4717 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4719 pedwarn ("ANSI C forbids qualified function types");
4721 type = c_build_qualified_type (type, type_quals);
4722 type_quals = TYPE_UNQUALIFIED;
4725 type = build_pointer_type (type);
4727 /* Process a list of type modifier keywords
4728 (such as const or volatile) that were given inside the `*'. */
4730 if (TREE_TYPE (declarator))
4732 register tree typemodlist;
4738 for (typemodlist = TREE_TYPE (declarator); typemodlist;
4739 typemodlist = TREE_CHAIN (typemodlist))
4741 tree qualifier = TREE_VALUE (typemodlist);
4743 if (qualifier == ridpointers[(int) RID_CONST])
4745 else if (qualifier == ridpointers[(int) RID_VOLATILE])
4747 else if (qualifier == ridpointers[(int) RID_RESTRICT])
4752 error ("invalid type modifier within pointer declarator");
4756 pedwarn ("duplicate `const'");
4758 pedwarn ("duplicate `volatile'");
4760 pedwarn ("duplicate `restrict'");
4762 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4763 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4764 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4767 declarator = TREE_OPERAND (declarator, 0);
4774 /* Now TYPE has the actual type. */
4776 /* Did array size calculations overflow? */
4778 if (TREE_CODE (type) == ARRAY_TYPE
4780 && TREE_OVERFLOW (TYPE_SIZE (type)))
4781 error ("size of array `%s' is too large", name);
4783 /* If this is declaring a typedef name, return a TYPE_DECL. */
4785 if (specbits & (1 << (int) RID_TYPEDEF))
4788 /* Note that the grammar rejects storage classes
4789 in typenames, fields or parameters */
4790 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4792 pedwarn ("ANSI C forbids qualified function types");
4794 type = c_build_qualified_type (type, type_quals);
4795 decl = build_decl (TYPE_DECL, declarator, type);
4796 if ((specbits & (1 << (int) RID_SIGNED))
4797 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4798 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
4803 /* Detect the case of an array type of unspecified size
4804 which came, as such, direct from a typedef name.
4805 We must copy the type, so that each identifier gets
4806 a distinct type, so that each identifier's size can be
4807 controlled separately by its own initializer. */
4809 if (type != 0 && typedef_type != 0
4810 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type)
4811 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0)
4813 type = build_array_type (TREE_TYPE (type), 0);
4815 C_TYPE_VARIABLE_SIZE (type) = 1;
4818 /* If this is a type name (such as, in a cast or sizeof),
4819 compute the type and return it now. */
4821 if (decl_context == TYPENAME)
4823 /* Note that the grammar rejects storage classes
4824 in typenames, fields or parameters */
4825 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4827 pedwarn ("ANSI C forbids const or volatile function types");
4829 type = c_build_qualified_type (type, type_quals);
4834 /* Aside from typedefs and type names (handle above),
4835 `void' at top level (not within pointer)
4836 is allowed only in public variables.
4837 We don't complain about parms either, but that is because
4838 a better error message can be made later. */
4840 if (TYPE_MAIN_VARIANT (type) == void_type_node && decl_context != PARM
4841 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
4842 && ((specbits & (1 << (int) RID_EXTERN))
4843 || (current_binding_level == global_binding_level
4845 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
4847 error ("variable or field `%s' declared void", name);
4848 type = integer_type_node;
4851 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
4852 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
4857 if (decl_context == PARM)
4859 tree type_as_written = type;
4862 /* A parameter declared as an array of T is really a pointer to T.
4863 One declared as a function is really a pointer to a function. */
4865 if (TREE_CODE (type) == ARRAY_TYPE)
4867 /* Transfer const-ness of array into that of type pointed to. */
4868 type = TREE_TYPE (type);
4870 type = c_build_qualified_type (type, type_quals);
4871 type = build_pointer_type (type);
4872 type_quals = TYPE_UNQUALIFIED;
4875 else if (TREE_CODE (type) == FUNCTION_TYPE)
4877 if (pedantic && type_quals)
4878 pedwarn ("ANSI C forbids qualified function types");
4880 type = c_build_qualified_type (type, type_quals);
4881 type = build_pointer_type (type);
4882 type_quals = TYPE_UNQUALIFIED;
4885 decl = build_decl (PARM_DECL, declarator, type);
4887 C_DECL_VARIABLE_SIZE (decl) = 1;
4889 /* Compute the type actually passed in the parmlist,
4890 for the case where there is no prototype.
4891 (For example, shorts and chars are passed as ints.)
4892 When there is a prototype, this is overridden later. */
4894 if (type == error_mark_node)
4895 promoted_type = type;
4898 promoted_type = simple_type_promotes_to (type);
4899 if (! promoted_type)
4900 promoted_type = type;
4903 DECL_ARG_TYPE (decl) = promoted_type;
4904 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
4906 else if (decl_context == FIELD)
4908 /* Structure field. It may not be a function. */
4910 if (TREE_CODE (type) == FUNCTION_TYPE)
4912 error ("field `%s' declared as a function", name);
4913 type = build_pointer_type (type);
4915 else if (TREE_CODE (type) != ERROR_MARK && TYPE_SIZE (type) == 0)
4917 error ("field `%s' has incomplete type", name);
4918 type = error_mark_node;
4920 /* Move type qualifiers down to element of an array. */
4921 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
4923 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
4925 TYPE_DOMAIN (type));
4926 #if 0 /* Leave the field const or volatile as well. */
4927 type_quals = TYPE_UNQUALIFIED;
4930 decl = build_decl (FIELD_DECL, declarator, type);
4932 C_DECL_VARIABLE_SIZE (decl) = 1;
4934 else if (TREE_CODE (type) == FUNCTION_TYPE)
4936 /* Every function declaration is "external"
4937 except for those which are inside a function body
4938 in which `auto' is used.
4939 That is a case not specified by ANSI C,
4940 and we use it for forward declarations for nested functions. */
4941 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4942 || current_binding_level == global_binding_level);
4944 if (specbits & (1 << (int) RID_AUTO)
4945 && (pedantic || current_binding_level == global_binding_level))
4946 pedwarn ("invalid storage class for function `%s'", name);
4947 if (specbits & (1 << (int) RID_REGISTER))
4948 error ("invalid storage class for function `%s'", name);
4949 /* Function declaration not at top level.
4950 Storage classes other than `extern' are not allowed
4951 and `extern' makes no difference. */
4952 if (current_binding_level != global_binding_level
4953 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
4955 pedwarn ("invalid storage class for function `%s'", name);
4957 /* If this is a block level extern, it must live past the end
4958 of the function so that we can check it against other
4959 extern declarations (IDENTIFIER_LIMBO_VALUE). */
4960 if (extern_ref && allocation_temporary_p ())
4961 end_temporary_allocation ();
4963 decl = build_decl (FUNCTION_DECL, declarator, type);
4964 decl = build_decl_attribute_variant (decl, decl_machine_attr);
4966 if (pedantic && type_quals && ! DECL_IN_SYSTEM_HEADER (decl))
4967 pedwarn ("ANSI C forbids qualified function types");
4970 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl))) == void_type_node
4971 && TYPE_QUALS (TREE_TYPE (TREE_TYPE (decl)))
4972 && ! DECL_IN_SYSTEM_HEADER (decl))
4973 pedwarn ("ANSI C forbids qualified void function return type");
4975 /* GNU C interprets a `volatile void' return type to indicate
4976 that the function does not return. */
4977 if ((type_quals & TYPE_QUAL_VOLATILE)
4978 && TREE_TYPE (TREE_TYPE (decl)) != void_type_node)
4979 warning ("`noreturn' function returns non-void value");
4982 DECL_EXTERNAL (decl) = 1;
4983 /* Record absence of global scope for `static' or `auto'. */
4985 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
4987 /* Record presence of `inline', if it is reasonable. */
4990 if (! strcmp (IDENTIFIER_POINTER (declarator), "main"))
4991 warning ("cannot inline function `main'");
4993 /* Assume that otherwise the function can be inlined. */
4994 DECL_INLINE (decl) = 1;
4996 if (specbits & (1 << (int) RID_EXTERN))
4997 current_extern_inline = 1;
5002 /* It's a variable. */
5003 /* An uninitialized decl with `extern' is a reference. */
5004 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
5006 /* Move type qualifiers down to element of an array. */
5007 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
5009 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
5011 TYPE_DOMAIN (type));
5012 #if 0 /* Leave the variable const or volatile as well. */
5013 type_quals = TYPE_UNQUALIFIED;
5017 /* If this is a block level extern, it must live past the end
5018 of the function so that we can check it against other
5019 extern declarations (IDENTIFIER_LIMBO_VALUE). */
5020 if (extern_ref && allocation_temporary_p ())
5021 end_temporary_allocation ();
5023 decl = build_decl (VAR_DECL, declarator, type);
5025 C_DECL_VARIABLE_SIZE (decl) = 1;
5028 pedwarn_with_decl (decl, "variable `%s' declared `inline'");
5030 DECL_EXTERNAL (decl) = extern_ref;
5031 /* At top level, the presence of a `static' or `register' storage
5032 class specifier, or the absence of all storage class specifiers
5033 makes this declaration a definition (perhaps tentative). Also,
5034 the absence of both `static' and `register' makes it public. */
5035 if (current_binding_level == global_binding_level)
5039 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)));
5040 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
5042 /* Not at top level, only `static' makes a static definition. */
5045 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
5046 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
5049 if (specbits & 1 << (int) RID_ITERATOR)
5050 ITERATOR_P (decl) = 1;
5053 /* Record `register' declaration for warnings on &
5054 and in case doing stupid register allocation. */
5056 if (specbits & (1 << (int) RID_REGISTER))
5057 DECL_REGISTER (decl) = 1;
5059 /* Record constancy and volatility. */
5060 c_apply_type_quals_to_decl (type_quals, decl);
5062 /* If a type has volatile components, it should be stored in memory.
5063 Otherwise, the fact that those components are volatile
5064 will be ignored, and would even crash the compiler. */
5065 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
5066 mark_addressable (decl);
5074 /* Decode the parameter-list info for a function type or function definition.
5075 The argument is the value returned by `get_parm_info' (or made in parse.y
5076 if there is an identifier list instead of a parameter decl list).
5077 These two functions are separate because when a function returns
5078 or receives functions then each is called multiple times but the order
5079 of calls is different. The last call to `grokparms' is always the one
5080 that contains the formal parameter names of a function definition.
5082 Store in `last_function_parms' a chain of the decls of parms.
5083 Also store in `last_function_parm_tags' a chain of the struct, union,
5084 and enum tags declared among the parms.
5086 Return a list of arg types to use in the FUNCTION_TYPE for this function.
5088 FUNCDEF_FLAG is nonzero for a function definition, 0 for
5089 a mere declaration. A nonempty identifier-list gets an error message
5090 when FUNCDEF_FLAG is zero. */
5093 grokparms (parms_info, funcdef_flag)
5097 tree first_parm = TREE_CHAIN (parms_info);
5099 last_function_parms = TREE_PURPOSE (parms_info);
5100 last_function_parm_tags = TREE_VALUE (parms_info);
5102 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
5103 && !in_system_header)
5104 warning ("function declaration isn't a prototype");
5107 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
5110 pedwarn ("parameter names (without types) in function declaration");
5112 last_function_parms = first_parm;
5119 /* We no longer test FUNCDEF_FLAG.
5120 If the arg types are incomplete in a declaration,
5121 they must include undefined tags.
5122 These tags can never be defined in the scope of the declaration,
5123 so the types can never be completed,
5124 and no call can be compiled successfully. */
5126 /* In a fcn definition, arg types must be complete. */
5129 for (parm = last_function_parms, typelt = first_parm;
5131 parm = TREE_CHAIN (parm))
5132 /* Skip over any enumeration constants declared here. */
5133 if (TREE_CODE (parm) == PARM_DECL)
5135 /* Barf if the parameter itself has an incomplete type. */
5136 tree type = TREE_VALUE (typelt);
5137 if (TYPE_SIZE (type) == 0)
5139 if (funcdef_flag && DECL_NAME (parm) != 0)
5140 error ("parameter `%s' has incomplete type",
5141 IDENTIFIER_POINTER (DECL_NAME (parm)));
5143 warning ("parameter has incomplete type");
5146 TREE_VALUE (typelt) = error_mark_node;
5147 TREE_TYPE (parm) = error_mark_node;
5150 #if 0 /* This has been replaced by parm_tags_warning
5151 which uses a more accurate criterion for what to warn about. */
5154 /* Now warn if is a pointer to an incomplete type. */
5155 while (TREE_CODE (type) == POINTER_TYPE
5156 || TREE_CODE (type) == REFERENCE_TYPE)
5157 type = TREE_TYPE (type);
5158 type = TYPE_MAIN_VARIANT (type);
5159 if (TYPE_SIZE (type) == 0)
5161 if (DECL_NAME (parm) != 0)
5162 warning ("parameter `%s' points to incomplete type",
5163 IDENTIFIER_POINTER (DECL_NAME (parm)));
5165 warning ("parameter points to incomplete type");
5169 typelt = TREE_CHAIN (typelt);
5172 /* Allocate the list of types the way we allocate a type. */
5173 if (first_parm && ! TREE_PERMANENT (first_parm))
5175 /* Construct a copy of the list of types
5176 on the saveable obstack. */
5178 for (typelt = first_parm; typelt; typelt = TREE_CHAIN (typelt))
5179 result = saveable_tree_cons (NULL_TREE, TREE_VALUE (typelt),
5181 return nreverse (result);
5184 /* The list we have is permanent already. */
5190 /* Return a tree_list node with info on a parameter list just parsed.
5191 The TREE_PURPOSE is a chain of decls of those parms.
5192 The TREE_VALUE is a list of structure, union and enum tags defined.
5193 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
5194 This tree_list node is later fed to `grokparms'.
5196 VOID_AT_END nonzero means append `void' to the end of the type-list.
5197 Zero means the parmlist ended with an ellipsis so don't append `void'. */
5200 get_parm_info (void_at_end)
5203 register tree decl, t;
5204 register tree types = 0;
5206 tree tags = gettags ();
5207 tree parms = getdecls ();
5209 tree order = current_binding_level->parm_order;
5211 /* Just `void' (and no ellipsis) is special. There are really no parms. */
5212 if (void_at_end && parms != 0
5213 && TREE_CHAIN (parms) == 0
5214 && TYPE_MAIN_VARIANT (TREE_TYPE (parms)) == void_type_node
5215 && DECL_NAME (parms) == 0)
5218 storedecls (NULL_TREE);
5219 return saveable_tree_cons (NULL_TREE, NULL_TREE,
5220 saveable_tree_cons (NULL_TREE, void_type_node, NULL_TREE));
5223 /* Extract enumerator values and other non-parms declared with the parms.
5224 Likewise any forward parm decls that didn't have real parm decls. */
5225 for (decl = parms; decl; )
5227 tree next = TREE_CHAIN (decl);
5229 if (TREE_CODE (decl) != PARM_DECL)
5231 TREE_CHAIN (decl) = new_parms;
5234 else if (TREE_ASM_WRITTEN (decl))
5236 error_with_decl (decl, "parameter `%s' has just a forward declaration");
5237 TREE_CHAIN (decl) = new_parms;
5243 /* Put the parm decls back in the order they were in in the parm list. */
5244 for (t = order; t; t = TREE_CHAIN (t))
5247 TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t));
5249 TREE_CHAIN (TREE_VALUE (t)) = 0;
5252 new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0,
5255 /* Store the parmlist in the binding level since the old one
5256 is no longer a valid list. (We have changed the chain pointers.) */
5257 storedecls (new_parms);
5259 for (decl = new_parms; decl; decl = TREE_CHAIN (decl))
5260 /* There may also be declarations for enumerators if an enumeration
5261 type is declared among the parms. Ignore them here. */
5262 if (TREE_CODE (decl) == PARM_DECL)
5264 /* Since there is a prototype,
5265 args are passed in their declared types. */
5266 tree type = TREE_TYPE (decl);
5267 DECL_ARG_TYPE (decl) = type;
5268 if (PROMOTE_PROTOTYPES
5269 && (TREE_CODE (type) == INTEGER_TYPE
5270 || TREE_CODE (type) == ENUMERAL_TYPE)
5271 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
5272 DECL_ARG_TYPE (decl) = integer_type_node;
5274 types = saveable_tree_cons (NULL_TREE, TREE_TYPE (decl), types);
5275 if (TYPE_MAIN_VARIANT (TREE_VALUE (types)) == void_type_node && ! erred
5276 && DECL_NAME (decl) == 0)
5278 error ("`void' in parameter list must be the entire list");
5284 return saveable_tree_cons (new_parms, tags,
5285 nreverse (saveable_tree_cons (NULL_TREE, void_type_node, types)));
5287 return saveable_tree_cons (new_parms, tags, nreverse (types));
5290 /* At end of parameter list, warn about any struct, union or enum tags
5291 defined within. Do so because these types cannot ever become complete. */
5294 parmlist_tags_warning ()
5299 for (elt = current_binding_level->tags; elt; elt = TREE_CHAIN (elt))
5301 enum tree_code code = TREE_CODE (TREE_VALUE (elt));
5302 /* An anonymous union parm type is meaningful as a GNU extension.
5303 So don't warn for that. */
5304 if (code == UNION_TYPE && TREE_PURPOSE (elt) == 0 && !pedantic)
5306 if (TREE_PURPOSE (elt) != 0)
5307 warning ("`%s %s' declared inside parameter list",
5308 (code == RECORD_TYPE ? "struct"
5309 : code == UNION_TYPE ? "union"
5311 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
5313 warning ("anonymous %s declared inside parameter list",
5314 (code == RECORD_TYPE ? "struct"
5315 : code == UNION_TYPE ? "union"
5320 warning ("its scope is only this definition or declaration, which is probably not what you want.");
5326 /* Get the struct, enum or union (CODE says which) with tag NAME.
5327 Define the tag as a forward-reference if it is not defined. */
5330 xref_tag (code, name)
5331 enum tree_code code;
5334 int temporary = allocation_temporary_p ();
5336 /* If a cross reference is requested, look up the type
5337 already defined for this tag and return it. */
5339 register tree ref = lookup_tag (code, name, current_binding_level, 0);
5340 /* Even if this is the wrong type of tag, return what we found.
5341 There will be an error message anyway, from pending_xref_error.
5342 If we create an empty xref just for an invalid use of the type,
5343 the main result is to create lots of superfluous error messages. */
5347 push_obstacks_nochange ();
5349 if (current_binding_level == global_binding_level && temporary)
5350 end_temporary_allocation ();
5352 /* If no such tag is yet defined, create a forward-reference node
5353 and record it as the "definition".
5354 When a real declaration of this type is found,
5355 the forward-reference will be altered into a real type. */
5357 ref = make_node (code);
5358 if (code == ENUMERAL_TYPE)
5360 /* (In ANSI, Enums can be referred to only if already defined.) */
5362 pedwarn ("ANSI C forbids forward references to `enum' types");
5363 /* Give the type a default layout like unsigned int
5364 to avoid crashing if it does not get defined. */
5365 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
5366 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
5367 TREE_UNSIGNED (ref) = 1;
5368 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
5369 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
5370 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
5373 pushtag (name, ref);
5380 /* Make sure that the tag NAME is defined *in the current binding level*
5381 at least as a forward reference.
5382 CODE says which kind of tag NAME ought to be.
5384 We also do a push_obstacks_nochange
5385 whose matching pop is in finish_struct. */
5388 start_struct (code, name)
5389 enum tree_code code;
5392 /* If there is already a tag defined at this binding level
5393 (as a forward reference), just return it. */
5395 register tree ref = 0;
5397 push_obstacks_nochange ();
5398 if (current_binding_level == global_binding_level)
5399 end_temporary_allocation ();
5402 ref = lookup_tag (code, name, current_binding_level, 1);
5403 if (ref && TREE_CODE (ref) == code)
5405 C_TYPE_BEING_DEFINED (ref) = 1;
5406 TYPE_PACKED (ref) = flag_pack_struct;
5407 if (TYPE_FIELDS (ref))
5408 error ((code == UNION_TYPE ? "redefinition of `union %s'"
5409 : "redefinition of `struct %s'"),
5410 IDENTIFIER_POINTER (name));
5415 /* Otherwise create a forward-reference just so the tag is in scope. */
5417 ref = make_node (code);
5418 pushtag (name, ref);
5419 C_TYPE_BEING_DEFINED (ref) = 1;
5420 TYPE_PACKED (ref) = flag_pack_struct;
5424 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
5425 of a structure component, returning a FIELD_DECL node.
5426 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
5428 This is done during the parsing of the struct declaration.
5429 The FIELD_DECL nodes are chained together and the lot of them
5430 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5433 grokfield (filename, line, declarator, declspecs, width)
5434 const char *filename ATTRIBUTE_UNUSED;
5435 int line ATTRIBUTE_UNUSED;
5436 tree declarator, declspecs, width;
5440 /* The corresponding pop_obstacks is in finish_decl. */
5441 push_obstacks_nochange ();
5443 value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
5445 finish_decl (value, NULL_TREE, NULL_TREE);
5446 DECL_INITIAL (value) = width;
5448 maybe_objc_check_decl (value);
5452 /* Function to help qsort sort FIELD_DECLs by name order. */
5455 field_decl_cmp (xp, yp)
5459 tree *x = (tree *)xp, *y = (tree *)yp;
5461 if (DECL_NAME (*x) == DECL_NAME (*y))
5463 if (DECL_NAME (*x) == NULL)
5465 if (DECL_NAME (*y) == NULL)
5467 if (DECL_NAME (*x) < DECL_NAME (*y))
5472 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5473 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5474 ATTRIBUTES are attributes to be applied to the structure.
5476 We also do a pop_obstacks to match the push in start_struct. */
5479 finish_struct (t, fieldlist, attributes)
5486 int toplevel = global_binding_level == current_binding_level;
5488 /* If this type was previously laid out as a forward reference,
5489 make sure we lay it out again. */
5493 decl_attributes (t, attributes, NULL_TREE);
5495 /* Nameless union parm types are useful as GCC extension. */
5496 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
5497 /* Otherwise, warn about any struct or union def. in parmlist. */
5498 if (in_parm_level_p ())
5501 pedwarn ((TREE_CODE (t) == UNION_TYPE ? "union defined inside parms"
5502 : "structure defined inside parms"));
5503 else if (! flag_traditional)
5504 warning ((TREE_CODE (t) == UNION_TYPE ? "union defined inside parms"
5505 : "structure defined inside parms"));
5508 old_momentary = suspend_momentary ();
5512 for (x = fieldlist; x; x = TREE_CHAIN (x))
5513 if (DECL_NAME (x) != 0)
5518 ? "%s has no named members"
5519 : "%s has no members"),
5520 TREE_CODE (t) == UNION_TYPE ? "union" : "struct");
5523 /* Install struct as DECL_CONTEXT of each field decl.
5524 Also process specified field sizes.
5525 Set DECL_FIELD_SIZE to the specified size, or 0 if none specified.
5526 The specified size is found in the DECL_INITIAL.
5527 Store 0 there, except for ": 0" fields (so we can find them
5528 and delete them, below). */
5530 for (x = fieldlist; x; x = TREE_CHAIN (x))
5532 DECL_CONTEXT (x) = t;
5533 DECL_PACKED (x) |= TYPE_PACKED (t);
5534 DECL_FIELD_SIZE (x) = 0;
5536 /* If any field is const, the structure type is pseudo-const. */
5537 if (TREE_READONLY (x))
5538 C_TYPE_FIELDS_READONLY (t) = 1;
5541 /* A field that is pseudo-const makes the structure likewise. */
5542 tree t1 = TREE_TYPE (x);
5543 while (TREE_CODE (t1) == ARRAY_TYPE)
5544 t1 = TREE_TYPE (t1);
5545 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5546 && C_TYPE_FIELDS_READONLY (t1))
5547 C_TYPE_FIELDS_READONLY (t) = 1;
5550 /* Any field that is volatile means variables of this type must be
5551 treated in some ways as volatile. */
5552 if (TREE_THIS_VOLATILE (x))
5553 C_TYPE_FIELDS_VOLATILE (t) = 1;
5555 /* Any field of nominal variable size implies structure is too. */
5556 if (C_DECL_VARIABLE_SIZE (x))
5557 C_TYPE_VARIABLE_SIZE (t) = 1;
5559 /* Detect invalid nested redefinition. */
5560 if (TREE_TYPE (x) == t)
5561 error ("nested redefinition of `%s'",
5562 IDENTIFIER_POINTER (TYPE_NAME (t)));
5564 /* Detect invalid bit-field size. */
5565 if (DECL_INITIAL (x))
5566 STRIP_NOPS (DECL_INITIAL (x));
5567 if (DECL_INITIAL (x))
5569 if (TREE_CODE (DECL_INITIAL (x)) == INTEGER_CST)
5570 constant_expression_warning (DECL_INITIAL (x));
5573 error_with_decl (x, "bit-field `%s' width not an integer constant");
5574 DECL_INITIAL (x) = NULL;
5578 /* Detect invalid bit-field type. */
5579 if (DECL_INITIAL (x)
5580 && TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE
5581 && TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE)
5583 error_with_decl (x, "bit-field `%s' has invalid type");
5584 DECL_INITIAL (x) = NULL;
5586 if (DECL_INITIAL (x) && pedantic
5587 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node
5588 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node
5589 /* Accept an enum that's equivalent to int or unsigned int. */
5590 && !(TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5591 && (TYPE_PRECISION (TREE_TYPE (x))
5592 == TYPE_PRECISION (integer_type_node))))
5593 pedwarn_with_decl (x, "bit-field `%s' type invalid in ANSI C");
5595 /* Detect and ignore out of range field width. */
5596 if (DECL_INITIAL (x))
5598 unsigned HOST_WIDE_INT width = TREE_INT_CST_LOW (DECL_INITIAL (x));
5600 if (tree_int_cst_sgn (DECL_INITIAL (x)) < 0)
5602 DECL_INITIAL (x) = NULL;
5603 error_with_decl (x, "negative width in bit-field `%s'");
5605 else if (TREE_INT_CST_HIGH (DECL_INITIAL (x)) != 0
5606 || width > TYPE_PRECISION (TREE_TYPE (x)))
5608 DECL_INITIAL (x) = NULL;
5609 pedwarn_with_decl (x, "width of `%s' exceeds its type");
5611 else if (width == 0 && DECL_NAME (x) != 0)
5613 error_with_decl (x, "zero width for bit-field `%s'");
5614 DECL_INITIAL (x) = NULL;
5618 /* Process valid field width. */
5619 if (DECL_INITIAL (x))
5621 register int width = TREE_INT_CST_LOW (DECL_INITIAL (x));
5623 if (TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5624 && (width < min_precision (TYPE_MIN_VALUE (TREE_TYPE (x)),
5625 TREE_UNSIGNED (TREE_TYPE (x)))
5626 || width < min_precision (TYPE_MAX_VALUE (TREE_TYPE (x)),
5627 TREE_UNSIGNED (TREE_TYPE (x)))))
5628 warning_with_decl (x, "`%s' is narrower than values of its type");
5630 DECL_FIELD_SIZE (x) = width;
5631 DECL_BIT_FIELD (x) = DECL_C_BIT_FIELD (x) = 1;
5632 DECL_INITIAL (x) = NULL;
5636 /* field size 0 => force desired amount of alignment. */
5637 #ifdef EMPTY_FIELD_BOUNDARY
5638 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), EMPTY_FIELD_BOUNDARY);
5640 #ifdef PCC_BITFIELD_TYPE_MATTERS
5641 if (PCC_BITFIELD_TYPE_MATTERS)
5642 DECL_ALIGN (x) = MAX (DECL_ALIGN (x),
5643 TYPE_ALIGN (TREE_TYPE (x)));
5647 else if (TREE_TYPE (x) != error_mark_node)
5649 unsigned int min_align = (DECL_PACKED (x) ? BITS_PER_UNIT
5650 : TYPE_ALIGN (TREE_TYPE (x)));
5651 /* Non-bit-fields are aligned for their type, except packed
5652 fields which require only BITS_PER_UNIT alignment. */
5653 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), min_align);
5657 /* Now DECL_INITIAL is null on all members. */
5659 /* Delete all duplicate fields from the fieldlist */
5660 for (x = fieldlist; x && TREE_CHAIN (x);)
5661 /* Anonymous fields aren't duplicates. */
5662 if (DECL_NAME (TREE_CHAIN (x)) == 0)
5666 register tree y = fieldlist;
5670 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5676 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
5678 error_with_decl (TREE_CHAIN (x), "duplicate member `%s'");
5679 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5681 else x = TREE_CHAIN (x);
5684 /* Now we have the nearly final fieldlist. Record it,
5685 then lay out the structure or union (including the fields). */
5687 TYPE_FIELDS (t) = fieldlist;
5691 /* Delete all zero-width bit-fields from the front of the fieldlist */
5693 && DECL_INITIAL (fieldlist))
5694 fieldlist = TREE_CHAIN (fieldlist);
5695 /* Delete all such members from the rest of the fieldlist */
5696 for (x = fieldlist; x;)
5698 if (TREE_CHAIN (x) && DECL_INITIAL (TREE_CHAIN (x)))
5699 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
5700 else x = TREE_CHAIN (x);
5703 /* Now we have the truly final field list.
5704 Store it in this type and in the variants. */
5706 TYPE_FIELDS (t) = fieldlist;
5708 /* If there are lots of fields, sort so we can look through them fast.
5709 We arbitrarily consider 16 or more elts to be "a lot". */
5713 for (x = fieldlist; x; x = TREE_CHAIN (x))
5724 len += list_length (x);
5725 /* Use the same allocation policy here that make_node uses, to
5726 ensure that this lives as long as the rest of the struct decl.
5727 All decls in an inline function need to be saved. */
5729 space = ggc_alloc (sizeof (struct lang_type) + len * sizeof (tree));
5730 else if (allocation_temporary_p ())
5731 space = savealloc (sizeof (struct lang_type) + len * sizeof (tree));
5733 space = oballoc (sizeof (struct lang_type) + len * sizeof (tree));
5735 TYPE_LANG_SPECIFIC (t) = (struct lang_type *) space;
5736 TYPE_LANG_SPECIFIC (t)->len = len;
5738 field_array = &TYPE_LANG_SPECIFIC (t)->elts[0];
5740 for (x = fieldlist; x; x = TREE_CHAIN (x))
5741 field_array[len++] = x;
5743 qsort (field_array, len, sizeof (tree), field_decl_cmp);
5747 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
5749 TYPE_FIELDS (x) = TYPE_FIELDS (t);
5750 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
5751 TYPE_ALIGN (x) = TYPE_ALIGN (t);
5754 /* If this was supposed to be a transparent union, but we can't
5755 make it one, warn and turn off the flag. */
5756 if (TREE_CODE (t) == UNION_TYPE
5757 && TYPE_TRANSPARENT_UNION (t)
5758 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
5760 TYPE_TRANSPARENT_UNION (t) = 0;
5761 warning ("union cannot be made transparent");
5764 /* If this structure or union completes the type of any previous
5765 variable declaration, lay it out and output its rtl. */
5767 if (current_binding_level->n_incomplete != 0)
5770 for (decl = current_binding_level->names; decl; decl = TREE_CHAIN (decl))
5772 if (TREE_TYPE (decl) == t
5773 && TREE_CODE (decl) != TYPE_DECL)
5775 layout_decl (decl, 0);
5776 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
5777 maybe_objc_check_decl (decl);
5778 rest_of_decl_compilation (decl, NULL_PTR, toplevel, 0);
5781 --current_binding_level->n_incomplete;
5783 else if (TYPE_SIZE (TREE_TYPE (decl)) == 0
5784 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
5786 tree element = TREE_TYPE (decl);
5787 while (TREE_CODE (element) == ARRAY_TYPE)
5788 element = TREE_TYPE (element);
5790 layout_array_type (TREE_TYPE (decl));
5795 resume_momentary (old_momentary);
5797 /* Finish debugging output for this type. */
5798 rest_of_type_compilation (t, toplevel);
5800 /* The matching push is in start_struct. */
5806 /* Lay out the type T, and its element type, and so on. */
5809 layout_array_type (t)
5812 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
5813 layout_array_type (TREE_TYPE (t));
5817 /* Begin compiling the definition of an enumeration type.
5818 NAME is its name (or null if anonymous).
5819 Returns the type object, as yet incomplete.
5820 Also records info about it so that build_enumerator
5821 may be used to declare the individual values as they are read. */
5827 register tree enumtype = 0;
5829 /* If this is the real definition for a previous forward reference,
5830 fill in the contents in the same object that used to be the
5831 forward reference. */
5834 enumtype = lookup_tag (ENUMERAL_TYPE, name, current_binding_level, 1);
5836 /* The corresponding pop_obstacks is in finish_enum. */
5837 push_obstacks_nochange ();
5838 /* If these symbols and types are global, make them permanent. */
5839 if (current_binding_level == global_binding_level)
5840 end_temporary_allocation ();
5842 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
5844 enumtype = make_node (ENUMERAL_TYPE);
5845 pushtag (name, enumtype);
5848 C_TYPE_BEING_DEFINED (enumtype) = 1;
5850 if (TYPE_VALUES (enumtype) != 0)
5852 /* This enum is a named one that has been declared already. */
5853 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
5855 /* Completely replace its old definition.
5856 The old enumerators remain defined, however. */
5857 TYPE_VALUES (enumtype) = 0;
5860 enum_next_value = integer_zero_node;
5863 if (flag_short_enums)
5864 TYPE_PACKED (enumtype) = 1;
5869 /* After processing and defining all the values of an enumeration type,
5870 install their decls in the enumeration type and finish it off.
5871 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
5872 and ATTRIBUTES are the specified attributes.
5873 Returns ENUMTYPE. */
5876 finish_enum (enumtype, values, attributes)
5881 register tree pair, tem;
5882 tree minnode = 0, maxnode = 0;
5883 int lowprec, highprec, precision;
5884 int toplevel = global_binding_level == current_binding_level;
5886 if (in_parm_level_p ())
5887 warning ("enum defined inside parms");
5889 decl_attributes (enumtype, attributes, NULL_TREE);
5891 /* Calculate the maximum value of any enumerator in this type. */
5893 if (values == error_mark_node)
5894 minnode = maxnode = integer_zero_node;
5896 for (pair = values; pair; pair = TREE_CHAIN (pair))
5898 tree value = TREE_VALUE (pair);
5900 minnode = maxnode = TREE_VALUE (pair);
5903 if (tree_int_cst_lt (maxnode, value))
5905 if (tree_int_cst_lt (value, minnode))
5910 TYPE_MIN_VALUE (enumtype) = minnode;
5911 TYPE_MAX_VALUE (enumtype) = maxnode;
5913 /* An enum can have some negative values; then it is signed. */
5914 TREE_UNSIGNED (enumtype) = tree_int_cst_sgn (minnode) >= 0;
5916 /* Determine the precision this type needs. */
5918 lowprec = min_precision (minnode, TREE_UNSIGNED (enumtype));
5919 highprec = min_precision (maxnode, TREE_UNSIGNED (enumtype));
5920 precision = MAX (lowprec, highprec);
5922 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
5924 tree narrowest = type_for_size (precision, 1);
5927 warning ("enumeration values exceed range of largest integer");
5928 narrowest = long_long_integer_type_node;
5931 TYPE_PRECISION (enumtype) = TYPE_PRECISION (narrowest);
5934 TYPE_PRECISION (enumtype) = TYPE_PRECISION (integer_type_node);
5936 TYPE_SIZE (enumtype) = 0;
5937 layout_type (enumtype);
5939 if (values != error_mark_node)
5941 /* Change the type of the enumerators to be the enum type.
5942 Formerly this was done only for enums that fit in an int,
5943 but the comment said it was done only for enums wider than int.
5944 It seems necessary to do this for wide enums,
5945 and best not to change what's done for ordinary narrower ones. */
5946 for (pair = values; pair; pair = TREE_CHAIN (pair))
5948 TREE_TYPE (TREE_PURPOSE (pair)) = enumtype;
5949 DECL_SIZE (TREE_PURPOSE (pair)) = TYPE_SIZE (enumtype);
5950 if (TREE_CODE (TREE_PURPOSE (pair)) != FUNCTION_DECL)
5951 DECL_ALIGN (TREE_PURPOSE (pair)) = TYPE_ALIGN (enumtype);
5954 /* Replace the decl nodes in VALUES with their names. */
5955 for (pair = values; pair; pair = TREE_CHAIN (pair))
5956 TREE_PURPOSE (pair) = DECL_NAME (TREE_PURPOSE (pair));
5958 TYPE_VALUES (enumtype) = values;
5961 /* Fix up all variant types of this enum type. */
5962 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
5964 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
5965 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
5966 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
5967 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
5968 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
5969 TYPE_MODE (tem) = TYPE_MODE (enumtype);
5970 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
5971 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
5972 TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
5975 /* Finish debugging output for this type. */
5976 rest_of_type_compilation (enumtype, toplevel);
5978 /* This matches a push in start_enum. */
5984 /* Build and install a CONST_DECL for one value of the
5985 current enumeration type (one that was begun with start_enum).
5986 Return a tree-list containing the CONST_DECL and its value.
5987 Assignment of sequential values by default is handled here. */
5990 build_enumerator (name, value)
5993 register tree decl, type;
5995 /* Validate and default VALUE. */
5997 /* Remove no-op casts from the value. */
5999 STRIP_TYPE_NOPS (value);
6003 if (TREE_CODE (value) == INTEGER_CST)
6005 value = default_conversion (value);
6006 constant_expression_warning (value);
6010 error ("enumerator value for `%s' not integer constant",
6011 IDENTIFIER_POINTER (name));
6016 /* Default based on previous value. */
6017 /* It should no longer be possible to have NON_LVALUE_EXPR
6021 value = enum_next_value;
6023 error ("overflow in enumeration values");
6026 if (pedantic && ! int_fits_type_p (value, integer_type_node))
6028 pedwarn ("ANSI C restricts enumerator values to range of `int'");
6029 value = integer_zero_node;
6032 /* Set basis for default for next value. */
6033 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
6034 enum_overflow = tree_int_cst_lt (enum_next_value, value);
6036 /* Now create a declaration for the enum value name. */
6038 type = TREE_TYPE (value);
6039 type = type_for_size (MAX (TYPE_PRECISION (type),
6040 TYPE_PRECISION (integer_type_node)),
6042 || TYPE_PRECISION (type) >= TYPE_PRECISION (integer_type_node))
6043 && TREE_UNSIGNED (type)));
6045 decl = build_decl (CONST_DECL, name, type);
6046 DECL_INITIAL (decl) = value;
6047 TREE_TYPE (value) = type;
6050 return saveable_tree_cons (decl, value, NULL_TREE);
6053 /* Create the FUNCTION_DECL for a function definition.
6054 DECLSPECS, DECLARATOR, PREFIX_ATTRIBUTES and ATTRIBUTES are the parts of
6055 the declaration; they describe the function's name and the type it returns,
6056 but twisted together in a fashion that parallels the syntax of C.
6058 This function creates a binding context for the function body
6059 as well as setting up the FUNCTION_DECL in current_function_decl.
6061 Returns 1 on success. If the DECLARATOR is not suitable for a function
6062 (it defines a datum instead), we return 0, which tells
6063 yyparse to report a parse error.
6065 NESTED is nonzero for a function nested within another function. */
6068 start_function (declspecs, declarator, prefix_attributes, attributes, nested)
6069 tree declarator, declspecs, prefix_attributes, attributes;
6072 tree decl1, old_decl;
6074 int old_immediate_size_expand = immediate_size_expand;
6076 current_function_returns_value = 0; /* Assume, until we see it does. */
6077 current_function_returns_null = 0;
6078 warn_about_return_type = 0;
6079 current_extern_inline = 0;
6080 c_function_varargs = 0;
6082 shadowed_labels = 0;
6084 /* Don't expand any sizes in the return type of the function. */
6085 immediate_size_expand = 0;
6087 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
6089 /* If the declarator is not suitable for a function definition,
6090 cause a syntax error. */
6093 immediate_size_expand = old_immediate_size_expand;
6097 decl_attributes (decl1, prefix_attributes, attributes);
6099 announce_function (decl1);
6101 if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl1))) == 0)
6103 error ("return-type is an incomplete type");
6104 /* Make it return void instead. */
6106 = build_function_type (void_type_node,
6107 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
6110 if (warn_about_return_type)
6111 warning ("return-type defaults to `int'");
6113 /* Save the parm names or decls from this function's declarator
6114 where store_parm_decls will find them. */
6115 current_function_parms = last_function_parms;
6116 current_function_parm_tags = last_function_parm_tags;
6118 /* Make the init_value nonzero so pushdecl knows this is not tentative.
6119 error_mark_node is replaced below (in poplevel) with the BLOCK. */
6120 DECL_INITIAL (decl1) = error_mark_node;
6122 /* If this definition isn't a prototype and we had a prototype declaration
6123 before, copy the arg type info from that prototype.
6124 But not if what we had before was a builtin function. */
6125 old_decl = lookup_name_current_level (DECL_NAME (decl1));
6126 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
6127 && !DECL_BUILT_IN (old_decl)
6128 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6129 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
6130 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
6132 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
6133 current_function_prototype_file = DECL_SOURCE_FILE (old_decl);
6134 current_function_prototype_line = DECL_SOURCE_LINE (old_decl);
6137 /* If there is no explicit declaration, look for any out-of-scope implicit
6140 old_decl = IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1));
6142 /* Optionally warn of old-fashioned def with no previous prototype. */
6143 if (warn_strict_prototypes
6144 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
6145 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0))
6146 warning ("function declaration isn't a prototype");
6147 /* Optionally warn of any global def with no previous prototype. */
6148 else if (warn_missing_prototypes
6149 && TREE_PUBLIC (decl1)
6150 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0)
6151 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))))
6152 warning_with_decl (decl1, "no previous prototype for `%s'");
6153 /* Optionally warn of any def with no previous prototype
6154 if the function has already been used. */
6155 else if (warn_missing_prototypes
6156 && old_decl != 0 && TREE_USED (old_decl)
6157 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
6158 warning_with_decl (decl1,
6159 "`%s' was used with no prototype before its definition");
6160 /* Optionally warn of any global def with no previous declaration. */
6161 else if (warn_missing_declarations
6162 && TREE_PUBLIC (decl1)
6164 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))))
6165 warning_with_decl (decl1, "no previous declaration for `%s'");
6166 /* Optionally warn of any def with no previous declaration
6167 if the function has already been used. */
6168 else if (warn_missing_declarations
6169 && old_decl != 0 && TREE_USED (old_decl)
6170 && old_decl == IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1)))
6171 warning_with_decl (decl1,
6172 "`%s' was used with no declaration before its definition");
6174 /* This is a definition, not a reference.
6175 So normally clear DECL_EXTERNAL.
6176 However, `extern inline' acts like a declaration
6177 except for defining how to inline. So set DECL_EXTERNAL in that case. */
6178 DECL_EXTERNAL (decl1) = current_extern_inline;
6180 #ifdef SET_DEFAULT_DECL_ATTRIBUTES
6181 SET_DEFAULT_DECL_ATTRIBUTES (decl1, attributes);
6184 /* This function exists in static storage.
6185 (This does not mean `static' in the C sense!) */
6186 TREE_STATIC (decl1) = 1;
6188 /* A nested function is not global. */
6189 if (current_function_decl != 0)
6190 TREE_PUBLIC (decl1) = 0;
6192 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
6194 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))) == 0)
6199 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6200 != integer_type_node)
6201 pedwarn_with_decl (decl1, "return type of `%s' is not `int'");
6203 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
6204 args = TREE_CHAIN (args))
6206 tree type = args ? TREE_VALUE (args) : 0;
6208 if (type == void_type_node)
6215 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
6216 pedwarn_with_decl (decl1,
6217 "first argument of `%s' should be `int'");
6221 if (TREE_CODE (type) != POINTER_TYPE
6222 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6223 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6225 pedwarn_with_decl (decl1,
6226 "second argument of `%s' should be `char **'");
6230 if (TREE_CODE (type) != POINTER_TYPE
6231 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6232 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6234 pedwarn_with_decl (decl1,
6235 "third argument of `%s' should probably be `char **'");
6240 /* It is intentional that this message does not mention the third
6241 argument, which is warned for only pedantically, because it's
6242 blessed by mention in an appendix of the standard. */
6243 if (argct > 0 && (argct < 2 || argct > 3))
6244 pedwarn_with_decl (decl1, "`%s' takes only zero or two arguments");
6246 if (argct == 3 && pedantic)
6247 pedwarn_with_decl (decl1, "third argument of `%s' is deprecated");
6249 if (! TREE_PUBLIC (decl1))
6250 pedwarn_with_decl (decl1, "`%s' is normally a non-static function");
6253 /* Record the decl so that the function name is defined.
6254 If we already have a decl for this name, and it is a FUNCTION_DECL,
6255 use the old decl. */
6257 current_function_decl = pushdecl (decl1);
6260 declare_parm_level (1);
6261 current_binding_level->subblocks_tag_transparent = 1;
6263 make_function_rtl (current_function_decl);
6265 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
6266 /* Promote the value to int before returning it. */
6267 if (C_PROMOTING_INTEGER_TYPE_P (restype))
6269 /* It retains unsignedness if traditional
6270 or if not really getting wider. */
6271 if (TREE_UNSIGNED (restype)
6272 && (flag_traditional
6273 || (TYPE_PRECISION (restype)
6274 == TYPE_PRECISION (integer_type_node))))
6275 restype = unsigned_type_node;
6277 restype = integer_type_node;
6279 DECL_RESULT (current_function_decl)
6280 = build_decl (RESULT_DECL, NULL_TREE, restype);
6283 /* Allocate further tree nodes temporarily during compilation
6284 of this function only. */
6285 temporary_allocation ();
6287 /* If this fcn was already referenced via a block-scope `extern' decl
6288 (or an implicit decl), propagate certain information about the usage. */
6289 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
6290 TREE_ADDRESSABLE (current_function_decl) = 1;
6292 immediate_size_expand = old_immediate_size_expand;
6297 /* Record that this function is going to be a varargs function.
6298 This is called before store_parm_decls, which is too early
6299 to call mark_varargs directly. */
6304 c_function_varargs = 1;
6307 /* Store the parameter declarations into the current function declaration.
6308 This is called after parsing the parameter declarations, before
6309 digesting the body of the function.
6311 For an old-style definition, modify the function's type
6312 to specify at least the number of arguments. */
6317 register tree fndecl = current_function_decl;
6320 /* This is either a chain of PARM_DECLs (if a prototype was used)
6321 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
6322 tree specparms = current_function_parms;
6324 /* This is a list of types declared among parms in a prototype. */
6325 tree parmtags = current_function_parm_tags;
6327 /* This is a chain of PARM_DECLs from old-style parm declarations. */
6328 register tree parmdecls = getdecls ();
6330 /* This is a chain of any other decls that came in among the parm
6331 declarations. If a parm is declared with enum {foo, bar} x;
6332 then CONST_DECLs for foo and bar are put here. */
6335 /* Nonzero if this definition is written with a prototype. */
6338 if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST)
6340 /* This case is when the function was defined with an ANSI prototype.
6341 The parms already have decls, so we need not do anything here
6342 except record them as in effect
6343 and complain if any redundant old-style parm decls were written. */
6354 error_with_decl (fndecl,
6355 "parm types given both in parmlist and separately");
6356 /* Get rid of the erroneous decls; don't keep them on
6357 the list of parms, since they might not be PARM_DECLs. */
6358 for (decl = current_binding_level->names;
6359 decl; decl = TREE_CHAIN (decl))
6360 if (DECL_NAME (decl))
6361 IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl)) = 0;
6362 for (link = current_binding_level->shadowed;
6363 link; link = TREE_CHAIN (link))
6364 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
6365 current_binding_level->names = 0;
6366 current_binding_level->shadowed = 0;
6369 specparms = nreverse (specparms);
6370 for (parm = specparms; parm; parm = next)
6372 next = TREE_CHAIN (parm);
6373 if (TREE_CODE (parm) == PARM_DECL)
6375 if (DECL_NAME (parm) == 0)
6376 error_with_decl (parm, "parameter name omitted");
6377 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6379 error_with_decl (parm, "parameter `%s' declared void");
6380 /* Change the type to error_mark_node so this parameter
6381 will be ignored by assign_parms. */
6382 TREE_TYPE (parm) = error_mark_node;
6388 /* If we find an enum constant or a type tag,
6389 put it aside for the moment. */
6390 TREE_CHAIN (parm) = 0;
6391 others = chainon (others, parm);
6395 /* Get the decls in their original chain order
6396 and record in the function. */
6397 DECL_ARGUMENTS (fndecl) = getdecls ();
6400 /* If this function takes a variable number of arguments,
6401 add a phony parameter to the end of the parm list,
6402 to represent the position of the first unnamed argument. */
6403 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl))))
6406 tree dummy = build_decl (PARM_DECL, NULL_TREE, void_type_node);
6407 /* Let's hope the address of the unnamed parm
6408 won't depend on its type. */
6409 TREE_TYPE (dummy) = integer_type_node;
6410 DECL_ARG_TYPE (dummy) = integer_type_node;
6411 DECL_ARGUMENTS (fndecl)
6412 = chainon (DECL_ARGUMENTS (fndecl), dummy);
6416 /* Now pushdecl the enum constants. */
6417 for (parm = others; parm; parm = next)
6419 next = TREE_CHAIN (parm);
6420 if (DECL_NAME (parm) == 0)
6422 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6424 else if (TREE_CODE (parm) != PARM_DECL)
6428 storetags (chainon (parmtags, gettags ()));
6432 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6433 each with a parm name as the TREE_VALUE.
6435 PARMDECLS is a chain of declarations for parameters.
6436 Warning! It can also contain CONST_DECLs which are not parameters
6437 but are names of enumerators of any enum types
6438 declared among the parameters.
6440 First match each formal parameter name with its declaration.
6441 Associate decls with the names and store the decls
6442 into the TREE_PURPOSE slots. */
6444 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6445 DECL_RESULT (parm) = 0;
6447 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6449 register tree tail, found = NULL;
6451 if (TREE_VALUE (parm) == 0)
6453 error_with_decl (fndecl, "parameter name missing from parameter list");
6454 TREE_PURPOSE (parm) = 0;
6458 /* See if any of the parmdecls specifies this parm by name.
6459 Ignore any enumerator decls. */
6460 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6461 if (DECL_NAME (tail) == TREE_VALUE (parm)
6462 && TREE_CODE (tail) == PARM_DECL)
6468 /* If declaration already marked, we have a duplicate name.
6469 Complain, and don't use this decl twice. */
6470 if (found && DECL_RESULT (found) != 0)
6472 error_with_decl (found, "multiple parameters named `%s'");
6476 /* If the declaration says "void", complain and ignore it. */
6477 if (found && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == void_type_node)
6479 error_with_decl (found, "parameter `%s' declared void");
6480 TREE_TYPE (found) = integer_type_node;
6481 DECL_ARG_TYPE (found) = integer_type_node;
6482 layout_decl (found, 0);
6485 /* Traditionally, a parm declared float is actually a double. */
6486 if (found && flag_traditional
6487 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6489 TREE_TYPE (found) = double_type_node;
6490 DECL_ARG_TYPE (found) = double_type_node;
6491 layout_decl (found, 0);
6494 /* If no declaration found, default to int. */
6497 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6499 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6500 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6501 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6503 warning_with_decl (found, "type of `%s' defaults to `int'");
6507 TREE_PURPOSE (parm) = found;
6509 /* Mark this decl as "already found" -- see test, above.
6510 It is safe to use DECL_RESULT for this
6511 since it is not used in PARM_DECLs or CONST_DECLs. */
6512 DECL_RESULT (found) = error_mark_node;
6515 /* Put anything which is on the parmdecls chain and which is
6516 not a PARM_DECL onto the list NONPARMS. (The types of
6517 non-parm things which might appear on the list include
6518 enumerators and NULL-named TYPE_DECL nodes.) Complain about
6519 any actual PARM_DECLs not matched with any names. */
6522 for (parm = parmdecls; parm; )
6524 tree next = TREE_CHAIN (parm);
6525 TREE_CHAIN (parm) = 0;
6527 if (TREE_CODE (parm) != PARM_DECL)
6528 nonparms = chainon (nonparms, parm);
6531 /* Complain about args with incomplete types. */
6532 if (TYPE_SIZE (TREE_TYPE (parm)) == 0)
6534 error_with_decl (parm, "parameter `%s' has incomplete type");
6535 TREE_TYPE (parm) = error_mark_node;
6538 if (DECL_RESULT (parm) == 0)
6540 error_with_decl (parm,
6541 "declaration for parameter `%s' but no such parameter");
6542 /* Pretend the parameter was not missing.
6543 This gets us to a standard state and minimizes
6544 further error messages. */
6546 = chainon (specparms,
6547 tree_cons (parm, NULL_TREE, NULL_TREE));
6554 /* Chain the declarations together in the order of the list of names. */
6555 /* Store that chain in the function decl, replacing the list of names. */
6557 DECL_ARGUMENTS (fndecl) = 0;
6560 for (last = 0; parm; parm = TREE_CHAIN (parm))
6561 if (TREE_PURPOSE (parm))
6564 DECL_ARGUMENTS (fndecl) = TREE_PURPOSE (parm);
6566 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6567 last = TREE_PURPOSE (parm);
6568 TREE_CHAIN (last) = 0;
6572 /* If there was a previous prototype,
6573 set the DECL_ARG_TYPE of each argument according to
6574 the type previously specified, and report any mismatches. */
6576 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
6579 for (parm = DECL_ARGUMENTS (fndecl),
6580 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
6581 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6582 != void_type_node));
6583 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6585 if (parm == 0 || type == 0
6586 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6588 error ("number of arguments doesn't match prototype");
6589 error_with_file_and_line (current_function_prototype_file,
6590 current_function_prototype_line,
6591 "prototype declaration");
6594 /* Type for passing arg must be consistent
6595 with that declared for the arg. */
6596 if (! comptypes (DECL_ARG_TYPE (parm), TREE_VALUE (type)))
6598 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6599 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6601 /* Adjust argument to match prototype. E.g. a previous
6602 `int foo(float);' prototype causes
6603 `int foo(x) float x; {...}' to be treated like
6604 `int foo(float x) {...}'. This is particularly
6605 useful for argument types like uid_t. */
6606 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6608 if (PROMOTE_PROTOTYPES
6609 && (TREE_CODE (TREE_TYPE (parm)) == INTEGER_TYPE
6610 || TREE_CODE (TREE_TYPE (parm)) == ENUMERAL_TYPE)
6611 && TYPE_PRECISION (TREE_TYPE (parm))
6612 < TYPE_PRECISION (integer_type_node))
6613 DECL_ARG_TYPE (parm) = integer_type_node;
6617 pedwarn ("promoted argument `%s' doesn't match prototype",
6618 IDENTIFIER_POINTER (DECL_NAME (parm)));
6619 warning_with_file_and_line
6620 (current_function_prototype_file,
6621 current_function_prototype_line,
6622 "prototype declaration");
6625 /* If -traditional, allow `int' argument to match
6626 `unsigned' prototype. */
6627 else if (! (flag_traditional
6628 && TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == integer_type_node
6629 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node))
6631 error ("argument `%s' doesn't match prototype",
6632 IDENTIFIER_POINTER (DECL_NAME (parm)));
6633 error_with_file_and_line (current_function_prototype_file,
6634 current_function_prototype_line,
6635 "prototype declaration");
6639 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
6642 /* Otherwise, create a prototype that would match. */
6646 tree actual = 0, last = 0, type;
6648 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
6650 type = perm_tree_cons (NULL_TREE, DECL_ARG_TYPE (parm),
6653 TREE_CHAIN (last) = type;
6658 type = perm_tree_cons (NULL_TREE, void_type_node, NULL_TREE);
6660 TREE_CHAIN (last) = type;
6664 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
6665 of the type of this function, but we need to avoid having this
6666 affect the types of other similarly-typed functions, so we must
6667 first force the generation of an identical (but separate) type
6668 node for the relevant function type. The new node we create
6669 will be a variant of the main variant of the original function
6672 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
6674 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
6677 /* Now store the final chain of decls for the arguments
6678 as the decl-chain of the current lexical scope.
6679 Put the enumerators in as well, at the front so that
6680 DECL_ARGUMENTS is not modified. */
6682 storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl)));
6685 /* Make sure the binding level for the top of the function body
6686 gets a BLOCK if there are any in the function.
6687 Otherwise, the dbx output is wrong. */
6689 keep_next_if_subblocks = 1;
6691 /* ??? This might be an improvement,
6692 but needs to be thought about some more. */
6694 keep_next_level_flag = 1;
6697 /* Write a record describing this function definition to the prototypes
6698 file (if requested). */
6700 gen_aux_info_record (fndecl, 1, 0, prototype);
6702 /* Initialize the RTL code for the function. */
6704 init_function_start (fndecl, input_filename, lineno);
6706 /* If this is a varargs function, inform function.c. */
6708 if (c_function_varargs)
6711 /* Declare __FUNCTION__ and __PRETTY_FUNCTION__ for this function. */
6713 declare_function_name ();
6715 /* Set up parameters and prepare for return, for the function. */
6717 expand_function_start (fndecl, 0);
6719 /* If this function is `main', emit a call to `__main'
6720 to run global initializers, etc. */
6721 if (DECL_NAME (fndecl)
6722 && strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main") == 0
6723 && DECL_CONTEXT (fndecl) == NULL_TREE)
6724 expand_main_function ();
6727 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6728 each with a parm name as the TREE_VALUE. A null pointer as TREE_VALUE
6729 stands for an ellipsis in the identifier list.
6731 PARMLIST is the data returned by get_parm_info for the
6732 parmlist that follows the semicolon.
6734 We return a value of the same sort that get_parm_info returns,
6735 except that it describes the combination of identifiers and parmlist. */
6738 combine_parm_decls (specparms, parmlist, void_at_end)
6739 tree specparms, parmlist;
6742 register tree fndecl = current_function_decl;
6745 tree parmdecls = TREE_PURPOSE (parmlist);
6747 /* This is a chain of any other decls that came in among the parm
6748 declarations. They were separated already by get_parm_info,
6749 so we just need to keep them separate. */
6750 tree nonparms = TREE_VALUE (parmlist);
6754 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6755 DECL_RESULT (parm) = 0;
6757 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6759 register tree tail, found = NULL;
6761 /* See if any of the parmdecls specifies this parm by name. */
6762 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6763 if (DECL_NAME (tail) == TREE_VALUE (parm))
6769 /* If declaration already marked, we have a duplicate name.
6770 Complain, and don't use this decl twice. */
6771 if (found && DECL_RESULT (found) != 0)
6773 error_with_decl (found, "multiple parameters named `%s'");
6777 /* If the declaration says "void", complain and ignore it. */
6778 if (found && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == void_type_node)
6780 error_with_decl (found, "parameter `%s' declared void");
6781 TREE_TYPE (found) = integer_type_node;
6782 DECL_ARG_TYPE (found) = integer_type_node;
6783 layout_decl (found, 0);
6786 /* Traditionally, a parm declared float is actually a double. */
6787 if (found && flag_traditional
6788 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6790 TREE_TYPE (found) = double_type_node;
6791 DECL_ARG_TYPE (found) = double_type_node;
6792 layout_decl (found, 0);
6795 /* If no declaration found, default to int. */
6798 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6800 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6801 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6802 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6803 error_with_decl (found, "type of parameter `%s' is not declared");
6807 TREE_PURPOSE (parm) = found;
6809 /* Mark this decl as "already found" -- see test, above.
6810 It is safe to use DECL_RESULT for this
6811 since it is not used in PARM_DECLs or CONST_DECLs. */
6812 DECL_RESULT (found) = error_mark_node;
6815 /* Complain about any actual PARM_DECLs not matched with any names. */
6817 for (parm = parmdecls; parm; )
6819 tree next = TREE_CHAIN (parm);
6820 TREE_CHAIN (parm) = 0;
6822 /* Complain about args with incomplete types. */
6823 if (TYPE_SIZE (TREE_TYPE (parm)) == 0)
6825 error_with_decl (parm, "parameter `%s' has incomplete type");
6826 TREE_TYPE (parm) = error_mark_node;
6829 if (DECL_RESULT (parm) == 0)
6831 error_with_decl (parm,
6832 "declaration for parameter `%s' but no such parameter");
6833 /* Pretend the parameter was not missing.
6834 This gets us to a standard state and minimizes
6835 further error messages. */
6837 = chainon (specparms,
6838 tree_cons (parm, NULL_TREE, NULL_TREE));
6844 /* Chain the declarations together in the order of the list of names.
6845 At the same time, build up a list of their types, in reverse order. */
6851 for (last = 0; parm; parm = TREE_CHAIN (parm))
6852 if (TREE_PURPOSE (parm))
6855 parmdecls = TREE_PURPOSE (parm);
6857 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6858 last = TREE_PURPOSE (parm);
6859 TREE_CHAIN (last) = 0;
6861 types = saveable_tree_cons (NULL_TREE, TREE_TYPE (parm), types);
6866 return saveable_tree_cons (parmdecls, nonparms,
6867 nreverse (saveable_tree_cons (NULL_TREE,
6871 return saveable_tree_cons (parmdecls, nonparms, nreverse (types));
6874 /* Finish up a function declaration and compile that function
6875 all the way to assembler language output. The free the storage
6876 for the function definition.
6878 This is called after parsing the body of the function definition.
6880 NESTED is nonzero if the function being finished is nested in another. */
6883 finish_function (nested)
6886 register tree fndecl = current_function_decl;
6888 /* TREE_READONLY (fndecl) = 1;
6889 This caused &foo to be of type ptr-to-const-function
6890 which then got a warning when stored in a ptr-to-function variable. */
6893 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
6895 /* Must mark the RESULT_DECL as being in this function. */
6897 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
6899 /* Obey `register' declarations if `setjmp' is called in this fn. */
6900 if (flag_traditional && current_function_calls_setjmp)
6902 setjmp_protect (DECL_INITIAL (fndecl));
6903 setjmp_protect_args ();
6906 if (! strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main"))
6908 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
6909 != integer_type_node)
6911 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
6912 If warn_main is -1 (-Wno-main) we don't want to be warned. */
6914 pedwarn_with_decl (fndecl, "return type of `%s' is not `int'");
6918 #ifdef DEFAULT_MAIN_RETURN
6919 /* Make it so that `main' always returns success by default. */
6920 DEFAULT_MAIN_RETURN;
6925 /* Generate rtl for function exit. */
6926 expand_function_end (input_filename, lineno, 0);
6928 /* So we can tell if jump_optimize sets it to 1. */
6931 /* Run the optimizers and output the assembler code for this function. */
6932 rest_of_compilation (fndecl);
6934 current_function_returns_null |= can_reach_end;
6936 if (warn_missing_noreturn
6937 && !TREE_THIS_VOLATILE (fndecl)
6938 && !current_function_returns_null
6939 && !current_function_returns_value)
6940 warning ("function might be possible candidate for attribute `noreturn'");
6942 if (TREE_THIS_VOLATILE (fndecl) && current_function_returns_null)
6943 warning ("`noreturn' function does return");
6944 else if (warn_return_type && can_reach_end
6945 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl))) != void_type_node)
6946 /* If this function returns non-void and control can drop through,
6948 warning ("control reaches end of non-void function");
6949 /* With just -W, complain only if function returns both with
6950 and without a value. */
6951 else if (extra_warnings
6952 && current_function_returns_value && current_function_returns_null)
6953 warning ("this function may return with or without a value");
6955 /* If requested, warn about function definitions where the function will
6956 return a value (usually of some struct or union type) which itself will
6957 take up a lot of stack space. */
6959 if (warn_larger_than && !DECL_EXTERNAL (fndecl) && TREE_TYPE (fndecl))
6961 register tree ret_type = TREE_TYPE (TREE_TYPE (fndecl));
6965 register tree ret_type_size = TYPE_SIZE (ret_type);
6967 if (TREE_CODE (ret_type_size) == INTEGER_CST)
6970 = TREE_INT_CST_LOW (ret_type_size) / BITS_PER_UNIT;
6972 if (units > larger_than_size)
6973 warning_with_decl (fndecl,
6974 "size of return value of `%s' is %u bytes",
6980 /* Free all the tree nodes making up this function. */
6981 /* Switch back to allocating nodes permanently
6982 until we start another function. */
6984 permanent_allocation (1);
6986 if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested)
6988 /* Stop pointing to the local nodes about to be freed. */
6989 /* But DECL_INITIAL must remain nonzero so we know this
6990 was an actual function definition. */
6991 /* For a nested function, this is done in pop_c_function_context. */
6992 /* If rest_of_compilation set this to 0, leave it 0. */
6993 if (DECL_INITIAL (fndecl) != 0)
6994 DECL_INITIAL (fndecl) = error_mark_node;
6995 DECL_ARGUMENTS (fndecl) = 0;
6998 if (DECL_STATIC_CONSTRUCTOR (fndecl))
7000 #ifndef ASM_OUTPUT_CONSTRUCTOR
7001 if (! flag_gnu_linker)
7002 static_ctors = perm_tree_cons (NULL_TREE, fndecl, static_ctors);
7005 assemble_constructor (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (fndecl)));
7008 if (DECL_STATIC_DESTRUCTOR (fndecl))
7010 #ifndef ASM_OUTPUT_DESTRUCTOR
7011 if (! flag_gnu_linker)
7012 static_dtors = perm_tree_cons (NULL_TREE, fndecl, static_dtors);
7015 assemble_destructor (IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (fndecl)));
7020 /* Let the error reporting routines know that we're outside a
7021 function. For a nested function, this value is used in
7022 pop_c_function_context and then reset via pop_function_context. */
7023 current_function_decl = NULL;
7027 /* Save and restore the variables in this file and elsewhere
7028 that keep track of the progress of compilation of the current function.
7029 Used for nested functions. */
7031 struct language_function
7034 tree shadowed_labels;
7037 int warn_about_return_type;
7039 struct binding_level *binding_level;
7042 /* Save and reinitialize the variables
7043 used during compilation of a C function. */
7046 push_c_function_context (f)
7049 struct language_function *p;
7050 p = (struct language_function *) xmalloc (sizeof (struct language_function));
7053 p->named_labels = named_labels;
7054 p->shadowed_labels = shadowed_labels;
7055 p->returns_value = current_function_returns_value;
7056 p->returns_null = current_function_returns_null;
7057 p->warn_about_return_type = warn_about_return_type;
7058 p->extern_inline = current_extern_inline;
7059 p->binding_level = current_binding_level;
7062 /* Restore the variables used during compilation of a C function. */
7065 pop_c_function_context (f)
7068 struct language_function *p = f->language;
7071 /* Bring back all the labels that were shadowed. */
7072 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
7073 if (DECL_NAME (TREE_VALUE (link)) != 0)
7074 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
7075 = TREE_VALUE (link);
7077 if (DECL_SAVED_INSNS (current_function_decl) == 0)
7079 /* Stop pointing to the local nodes about to be freed. */
7080 /* But DECL_INITIAL must remain nonzero so we know this
7081 was an actual function definition. */
7082 DECL_INITIAL (current_function_decl) = error_mark_node;
7083 DECL_ARGUMENTS (current_function_decl) = 0;
7086 named_labels = p->named_labels;
7087 shadowed_labels = p->shadowed_labels;
7088 current_function_returns_value = p->returns_value;
7089 current_function_returns_null = p->returns_null;
7090 warn_about_return_type = p->warn_about_return_type;
7091 current_extern_inline = p->extern_inline;
7092 current_binding_level = p->binding_level;
7098 /* Mark the language specific parts of F for GC. */
7100 mark_c_function_context (f)
7103 struct language_function *p = f->language;
7108 ggc_mark_tree (p->shadowed_labels);
7109 ggc_mark_tree (p->named_labels);
7110 mark_binding_level (&p->binding_level);
7113 /* integrate_decl_tree calls this function, but since we don't use the
7114 DECL_LANG_SPECIFIC field, this is a no-op. */
7117 copy_lang_decl (node)
7118 tree node ATTRIBUTE_UNUSED;
7122 /* Mark ARG for GC. */
7124 lang_mark_false_label_stack (arg)
7125 struct label_node *arg;
7127 /* C doesn't use false_label_stack. It better be NULL. */
7132 /* Mark the language specific bits in T for GC. */
7137 if (TREE_CODE (t) == IDENTIFIER_NODE)
7139 struct lang_identifier *i = (struct lang_identifier *) t;
7140 ggc_mark_tree (i->global_value);
7141 ggc_mark_tree (i->local_value);
7142 ggc_mark_tree (i->label_value);
7143 ggc_mark_tree (i->implicit_decl);
7144 ggc_mark_tree (i->error_locus);
7145 ggc_mark_tree (i->limbo_value);
7147 else if (TYPE_P (t) && TYPE_LANG_SPECIFIC (t))
7148 ggc_mark (TYPE_LANG_SPECIFIC (t));