1 /* Process declarations and variables for C compiler.
2 Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000
3 Free Software Foundation, Inc.
5 This file is part of GNU CC.
7 GNU CC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2, or (at your option)
12 GNU CC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with GNU CC; see the file COPYING. If not, write to
19 the Free Software Foundation, 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
22 /* $FreeBSD: src/contrib/gcc/c-decl.c,v 1.1.1.4.2.3 2002/06/21 22:38:03 obrien Exp $ */
23 /* $DragonFly: src/contrib/gcc/Attic/c-decl.c,v 1.2 2003/06/17 04:23:59 dillon Exp $ */
25 /* Process declarations and symbol lookup for C front end.
26 Also constructs types; the standard scalar types at initialization,
27 and structure, union, array and enum types when they are declared. */
29 /* ??? not all decl nodes are given the most useful possible
30 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"
109 /* a node which has tree code ERROR_MARK, and whose type is itself.
110 All erroneous expressions are replaced with this node. All functions
111 that accept nodes as arguments should avoid generating error messages
112 if this node is one of the arguments, since it is undesirable to get
113 multiple error messages from one error in the input. */
115 tree error_mark_node;
117 /* INTEGER_TYPE and REAL_TYPE nodes for the standard data types */
119 tree short_integer_type_node;
120 tree integer_type_node;
121 tree long_integer_type_node;
122 tree long_long_integer_type_node;
124 tree short_unsigned_type_node;
125 tree unsigned_type_node;
126 tree long_unsigned_type_node;
127 tree long_long_unsigned_type_node;
129 tree boolean_type_node;
130 tree boolean_false_node;
131 tree boolean_true_node;
133 tree ptrdiff_type_node;
135 tree unsigned_char_type_node;
136 tree signed_char_type_node;
138 tree wchar_type_node;
139 tree signed_wchar_type_node;
140 tree unsigned_wchar_type_node;
142 tree float_type_node;
143 tree double_type_node;
144 tree long_double_type_node;
146 tree complex_integer_type_node;
147 tree complex_float_type_node;
148 tree complex_double_type_node;
149 tree complex_long_double_type_node;
151 tree intQI_type_node;
152 tree intHI_type_node;
153 tree intSI_type_node;
154 tree intDI_type_node;
155 #if HOST_BITS_PER_WIDE_INT >= 64
156 tree intTI_type_node;
159 tree unsigned_intQI_type_node;
160 tree unsigned_intHI_type_node;
161 tree unsigned_intSI_type_node;
162 tree unsigned_intDI_type_node;
163 #if HOST_BITS_PER_WIDE_INT >= 64
164 tree unsigned_intTI_type_node;
167 /* a VOID_TYPE node. */
171 /* Nodes for types `void *' and `const void *'. */
173 tree ptr_type_node, const_ptr_type_node;
175 /* Nodes for types `char *' and `const char *'. */
177 tree string_type_node, const_string_type_node;
179 /* Type `char[SOMENUMBER]'.
180 Used when an array of char is needed and the size is irrelevant. */
182 tree char_array_type_node;
184 /* Type `int[SOMENUMBER]' or something like it.
185 Used when an array of int needed and the size is irrelevant. */
187 tree int_array_type_node;
189 /* Type `wchar_t[SOMENUMBER]' or something like it.
190 Used when a wide string literal is created. */
192 tree wchar_array_type_node;
194 /* type `int ()' -- used for implicit declaration of functions. */
196 tree default_function_type;
198 /* function types `double (double)' and `double (double, double)', etc. */
200 tree double_ftype_double, double_ftype_double_double;
201 tree int_ftype_int, long_ftype_long;
202 tree float_ftype_float;
203 tree ldouble_ftype_ldouble;
205 /* Function type `void (void *, void *, int)' and similar ones */
207 tree void_ftype_ptr_ptr_int, int_ftype_ptr_ptr_int, void_ftype_ptr_int_int;
209 /* Function type `char *(char *, char *)' and similar ones */
210 tree string_ftype_ptr_ptr, int_ftype_string_string;
212 /* Function type `int (const void *, const void *, size_t)' */
213 tree int_ftype_cptr_cptr_sizet;
215 /* Two expressions that are constants with value zero.
216 The first is of type `int', the second of type `void *'. */
218 tree integer_zero_node;
219 tree null_pointer_node;
221 /* A node for the integer constant 1. */
223 tree integer_one_node;
225 /* Nonzero if we have seen an invalid cross reference
226 to a struct, union, or enum, but not yet printed the message. */
228 tree pending_invalid_xref;
229 /* File and line to appear in the eventual error message. */
230 char *pending_invalid_xref_file;
231 int pending_invalid_xref_line;
233 /* While defining an enum type, this is 1 plus the last enumerator
234 constant value. Note that will do not have to save this or `enum_overflow'
235 around nested function definition since such a definition could only
236 occur in an enum value expression and we don't use these variables in
239 static tree enum_next_value;
241 /* Nonzero means that there was overflow computing enum_next_value. */
243 static int enum_overflow;
245 /* Parsing a function declarator leaves a list of parameter names
246 or a chain or parameter decls here. */
248 static tree last_function_parms;
250 /* Parsing a function declarator leaves here a chain of structure
251 and enum types declared in the parmlist. */
253 static tree last_function_parm_tags;
255 /* After parsing the declarator that starts a function definition,
256 `start_function' puts here the list of parameter names or chain of decls.
257 `store_parm_decls' finds it here. */
259 static tree current_function_parms;
261 /* Similar, for last_function_parm_tags. */
262 static tree current_function_parm_tags;
264 /* Similar, for the file and line that the prototype came from if this is
265 an old-style definition. */
266 static char *current_function_prototype_file;
267 static int current_function_prototype_line;
269 /* A list (chain of TREE_LIST nodes) of all LABEL_DECLs in the function
270 that have names. Here so we can clear out their names' definitions
271 at the end of the function. */
273 static tree named_labels;
275 /* A list of LABEL_DECLs from outer contexts that are currently shadowed. */
277 static tree shadowed_labels;
279 /* Nonzero when store_parm_decls is called indicates a varargs function.
280 Value not meaningful after store_parm_decls. */
282 static int c_function_varargs;
284 /* The FUNCTION_DECL for the function currently being compiled,
285 or 0 if between functions. */
286 tree current_function_decl;
288 /* Set to 0 at beginning of a function definition, set to 1 if
289 a return statement that specifies a return value is seen. */
291 int current_function_returns_value;
293 /* Set to 0 at beginning of a function definition, set to 1 if
294 a return statement with no argument is seen. */
296 int current_function_returns_null;
298 /* Set to nonzero by `grokdeclarator' for a function
299 whose return type is defaulted, if warnings for this are desired. */
301 static int warn_about_return_type;
303 /* Nonzero when starting a function declared `extern inline'. */
305 static int current_extern_inline;
307 /* For each binding contour we allocate a binding_level structure
308 * which records the names defined in that contour.
311 * 1) one for each function definition,
312 * where internal declarations of the parameters appear.
313 * 2) one for each compound statement,
314 * to record its declarations.
316 * The current meaning of a name can be found by searching the levels from
317 * the current one out to the global one.
320 /* Note that the information in the `names' component of the global contour
321 is duplicated in the IDENTIFIER_GLOBAL_VALUEs of all identifiers. */
325 /* A chain of _DECL nodes for all variables, constants, functions,
326 and typedef types. These are in the reverse of the order supplied.
330 /* A list of structure, union and enum definitions,
331 * for looking up tag names.
332 * It is a chain of TREE_LIST nodes, each of whose TREE_PURPOSE is a name,
333 * or NULL_TREE; and whose TREE_VALUE is a RECORD_TYPE, UNION_TYPE,
334 * or ENUMERAL_TYPE node.
338 /* For each level, a list of shadowed outer-level local definitions
339 to be restored when this level is popped.
340 Each link is a TREE_LIST whose TREE_PURPOSE is an identifier and
341 whose TREE_VALUE is its old definition (a kind of ..._DECL node). */
344 /* For each level (except not the global one),
345 a chain of BLOCK nodes for all the levels
346 that were entered and exited one level down. */
349 /* The BLOCK node for this level, if one has been preallocated.
350 If 0, the BLOCK is allocated (if needed) when the level is popped. */
353 /* The binding level which this one is contained in (inherits from). */
354 struct binding_level *level_chain;
356 /* Nonzero for the level that holds the parameters of a function. */
359 /* Nonzero if this level "doesn't exist" for tags. */
360 char tag_transparent;
362 /* Nonzero if sublevels of this level "don't exist" for tags.
363 This is set in the parm level of a function definition
364 while reading the function body, so that the outermost block
365 of the function body will be tag-transparent. */
366 char subblocks_tag_transparent;
368 /* Nonzero means make a BLOCK for this level regardless of all else. */
371 /* Nonzero means make a BLOCK if this level has any subblocks. */
372 char keep_if_subblocks;
374 /* Number of decls in `names' that have incomplete
375 structure or union types. */
378 /* A list of decls giving the (reversed) specified order of parms,
379 not including any forward-decls in the parmlist.
380 This is so we can put the parms in proper order for assign_parms. */
384 #define NULL_BINDING_LEVEL (struct binding_level *) NULL
386 /* The binding level currently in effect. */
388 static struct binding_level *current_binding_level;
390 /* A chain of binding_level structures awaiting reuse. */
392 static struct binding_level *free_binding_level;
394 /* The outermost binding level, for names of file scope.
395 This is created when the compiler is started and exists
396 through the entire run. */
398 static struct binding_level *global_binding_level;
400 /* Binding level structures are initialized by copying this one. */
402 static struct binding_level clear_binding_level
403 = {NULL, NULL, NULL, NULL, NULL, NULL_BINDING_LEVEL, 0, 0, 0, 0, 0, 0,
406 /* Nonzero means unconditionally make a BLOCK for the next level pushed. */
408 static int keep_next_level_flag;
410 /* Nonzero means make a BLOCK for the next level pushed
411 if it has subblocks. */
413 static int keep_next_if_subblocks;
415 /* The chain of outer levels of label scopes.
416 This uses the same data structure used for binding levels,
417 but it works differently: each link in the chain records
418 saved values of named_labels and shadowed_labels for
419 a label binding level outside the current one. */
421 static struct binding_level *label_level_chain;
423 /* Functions called automatically at the beginning and end of execution. */
425 tree static_ctors, static_dtors;
427 /* Forward declarations. */
429 static struct binding_level * make_binding_level PROTO((void));
430 static void clear_limbo_values PROTO((tree));
431 static int duplicate_decls PROTO((tree, tree, int));
432 static int redeclaration_error_message PROTO((tree, tree));
433 static void storedecls PROTO((tree));
434 static void storetags PROTO((tree));
435 static tree lookup_tag PROTO((enum tree_code, tree,
436 struct binding_level *, int));
437 static tree lookup_tag_reverse PROTO((tree));
438 static tree grokdeclarator PROTO((tree, tree, enum decl_context,
440 static tree grokparms PROTO((tree, int));
441 static int field_decl_cmp PROTO((const GENERIC_PTR, const GENERIC_PTR));
442 static void layout_array_type PROTO((tree));
444 /* C-specific option variables. */
446 /* Nonzero means allow type mismatches in conditional expressions;
447 just make their values `void'. */
449 int flag_cond_mismatch;
451 /* Nonzero means give `double' the same size as `float'. */
453 int flag_short_double;
455 /* Nonzero means don't recognize the keyword `asm'. */
459 /* Nonzero means don't recognize any builtin functions. */
463 /* Nonzero means don't recognize the non-ANSI builtin functions.
466 int flag_no_nonansi_builtin;
468 /* Nonzero means do some things the same way PCC does. */
470 int flag_traditional;
472 /* Nonzero means use the ISO C9x dialect of C. */
476 /* Nonzero means that we have builtin functions, and main is an int */
480 /* Nonzero means to allow single precision math even if we're generally
481 being traditional. */
482 int flag_allow_single_precision = 0;
484 /* Nonzero means to treat bitfields as signed unless they say `unsigned'. */
486 int flag_signed_bitfields = 1;
487 int explicit_flag_signed_bitfields = 0;
489 /* Nonzero means warn about use of implicit int. */
491 int warn_implicit_int;
493 /* Nonzero means warn about usage of long long when `-pedantic'. */
495 int warn_long_long = 1;
497 /* Nonzero means message about use of implicit function declarations;
498 1 means warning; 2 means error. */
500 int mesg_implicit_function_declaration;
502 /* Nonzero means give string constants the type `const char *'
503 to get extra warnings from them. These warnings will be too numerous
504 to be useful, except in thoroughly ANSIfied programs. */
506 int flag_const_strings;
508 /* Nonzero means warn about pointer casts that can drop a type qualifier
509 from the pointer target type. */
513 /* Nonzero means warn when casting a function call to a type that does
514 not match the return type (e.g. (float)sqrt() or (anything*)malloc()
515 when there is no previous declaration of sqrt or malloc. */
517 int warn_bad_function_cast;
519 /* Warn about functions which might be candidates for attribute noreturn. */
521 int warn_missing_noreturn;
523 /* Warn about traditional constructs whose meanings changed in ANSI C. */
525 int warn_traditional;
527 /* Nonzero means warn about sizeof(function) or addition/subtraction
528 of function pointers. */
530 int warn_pointer_arith;
532 /* Nonzero means warn for non-prototype function decls
533 or non-prototyped defs without previous prototype. */
535 int warn_strict_prototypes;
537 /* Nonzero means warn for any global function def
538 without separate previous prototype decl. */
540 int warn_missing_prototypes;
542 /* Nonzero means warn for any global function def
543 without separate previous decl. */
545 int warn_missing_declarations;
547 /* Nonzero means warn about multiple (redundant) decls for the same single
548 variable or function. */
550 int warn_redundant_decls = 0;
552 /* Nonzero means warn about extern declarations of objects not at
553 file-scope level and about *all* declarations of functions (whether
554 extern or static) not at file-scope level. Note that we exclude
555 implicit function declarations. To get warnings about those, use
558 int warn_nested_externs = 0;
560 /* Warn about *printf or *scanf format/argument anomalies. */
563 int warn_format_extra_args;
565 /* Warn about a subscript that has type char. */
567 int warn_char_subscripts = 0;
569 /* Warn if a type conversion is done that might have confusing results. */
573 /* Warn if adding () is suggested. */
575 int warn_parentheses;
577 /* Warn if initializer is not completely bracketed. */
579 int warn_missing_braces;
581 /* Warn if main is suspicious. */
585 /* Warn about #pragma directives that are not recognised. */
587 int warn_unknown_pragmas = 0; /* Tri state variable. */
589 /* Warn about comparison of signed and unsigned values.
590 If -1, neither -Wsign-compare nor -Wno-sign-compare has been specified. */
592 int warn_sign_compare = -1;
594 /* Nonzero means warn about use of multicharacter literals. */
596 int warn_multichar = 1;
598 /* Nonzero means `$' can be in an identifier. */
600 #ifndef DOLLARS_IN_IDENTIFIERS
601 #define DOLLARS_IN_IDENTIFIERS 1
603 int dollars_in_ident = DOLLARS_IN_IDENTIFIERS;
605 /* Decode the string P as a language-specific option for C.
606 Return the number of strings consumed. */
609 c_decode_option (argc, argv)
610 int argc ATTRIBUTE_UNUSED;
613 int strings_processed;
616 strings_processed = cpp_handle_option (&parse_in, argc, argv);
618 strings_processed = 0;
619 #endif /* ! USE_CPPLIB */
621 if (!strcmp (p, "-ftraditional") || !strcmp (p, "-traditional"))
623 flag_traditional = 1;
624 flag_writable_strings = 1;
626 else if (!strcmp (p, "-fallow-single-precision"))
627 flag_allow_single_precision = 1;
628 else if (!strcmp (p, "-fhosted") || !strcmp (p, "-fno-freestanding"))
633 else if (!strcmp (p, "-ffreestanding") || !strcmp (p, "-fno-hosted"))
637 /* warn_main will be 2 if set by -Wall, 1 if set by -Wmain */
641 else if (!strcmp (p, "-fnotraditional") || !strcmp (p, "-fno-traditional"))
643 flag_traditional = 0;
644 flag_writable_strings = 0;
646 else if (!strncmp (p, "-std=", 5))
648 /* Select the appropriate language standard. We currently
650 -std=iso9899:1990 same as -ansi
651 -std=iso9899:199409 ISO C as modified in amend. 1
652 -std=iso9899:199x ISO C 9x
653 -std=c89 same as -std=iso9899:1990
654 -std=c9x same as -std=iso9899:199x
655 -std=gnu89 default, iso9899:1990 + gnu extensions
656 -std=gnu9x iso9899:199x + gnu extensions
658 const char *argstart = &p[5];
660 if (!strcmp (argstart, "iso9899:1990")
661 || !strcmp (argstart, "c89"))
664 flag_traditional = 0;
665 flag_writable_strings = 0;
667 flag_no_nonansi_builtin = 1;
670 else if (!strcmp (argstart, "iso9899:199409"))
672 /* ??? The changes since ISO C 1990 are not supported. */
675 else if (!strcmp (argstart, "iso9899:199x")
676 || !strcmp (argstart, "c9x"))
678 flag_traditional = 0;
679 flag_writable_strings = 0;
681 flag_no_nonansi_builtin = 1;
684 else if (!strcmp (argstart, "gnu89"))
686 flag_traditional = 0;
687 flag_writable_strings = 0;
689 flag_no_nonansi_builtin = 0;
692 else if (!strcmp (argstart, "gnu9x"))
694 flag_traditional = 0;
695 flag_writable_strings = 0;
697 flag_no_nonansi_builtin = 0;
701 error ("unknown C standard `%s'", argstart);
703 else if (!strcmp (p, "-fdollars-in-identifiers"))
704 dollars_in_ident = 1;
705 else if (!strcmp (p, "-fno-dollars-in-identifiers"))
706 dollars_in_ident = 0;
707 else if (!strcmp (p, "-fsigned-char"))
708 flag_signed_char = 1;
709 else if (!strcmp (p, "-funsigned-char"))
710 flag_signed_char = 0;
711 else if (!strcmp (p, "-fno-signed-char"))
712 flag_signed_char = 0;
713 else if (!strcmp (p, "-fno-unsigned-char"))
714 flag_signed_char = 1;
715 else if (!strcmp (p, "-fsigned-bitfields")
716 || !strcmp (p, "-fno-unsigned-bitfields"))
718 flag_signed_bitfields = 1;
719 explicit_flag_signed_bitfields = 1;
721 else if (!strcmp (p, "-funsigned-bitfields")
722 || !strcmp (p, "-fno-signed-bitfields"))
724 flag_signed_bitfields = 0;
725 explicit_flag_signed_bitfields = 1;
727 else if (!strcmp (p, "-fshort-enums"))
728 flag_short_enums = 1;
729 else if (!strcmp (p, "-fno-short-enums"))
730 flag_short_enums = 0;
731 else if (!strcmp (p, "-fcond-mismatch"))
732 flag_cond_mismatch = 1;
733 else if (!strcmp (p, "-fno-cond-mismatch"))
734 flag_cond_mismatch = 0;
735 else if (!strcmp (p, "-fshort-double"))
736 flag_short_double = 1;
737 else if (!strcmp (p, "-fno-short-double"))
738 flag_short_double = 0;
739 else if (!strcmp (p, "-fasm"))
741 else if (!strcmp (p, "-fno-asm"))
743 else if (!strcmp (p, "-fbuiltin"))
745 else if (!strcmp (p, "-fno-builtin"))
747 else if (!strcmp (p, "-ansi"))
749 else if (!strcmp (p, "-Werror-implicit-function-declaration"))
750 mesg_implicit_function_declaration = 2;
751 else if (!strcmp (p, "-Wimplicit-function-declaration"))
752 mesg_implicit_function_declaration = 1;
753 else if (!strcmp (p, "-Wno-implicit-function-declaration"))
754 mesg_implicit_function_declaration = 0;
755 else if (!strcmp (p, "-Wimplicit-int"))
756 warn_implicit_int = 1;
757 else if (!strcmp (p, "-Wno-implicit-int"))
758 warn_implicit_int = 0;
759 else if (!strcmp (p, "-Wimplicit"))
761 warn_implicit_int = 1;
762 if (mesg_implicit_function_declaration != 2)
763 mesg_implicit_function_declaration = 1;
765 else if (!strcmp (p, "-Wno-implicit"))
766 warn_implicit_int = 0, mesg_implicit_function_declaration = 0;
767 else if (!strcmp (p, "-Wlong-long"))
769 else if (!strcmp (p, "-Wno-long-long"))
771 else if (!strcmp (p, "-Wwrite-strings"))
772 flag_const_strings = 1;
773 else if (!strcmp (p, "-Wno-write-strings"))
774 flag_const_strings = 0;
775 else if (!strcmp (p, "-Wcast-qual"))
777 else if (!strcmp (p, "-Wno-cast-qual"))
779 else if (!strcmp (p, "-Wbad-function-cast"))
780 warn_bad_function_cast = 1;
781 else if (!strcmp (p, "-Wno-bad-function-cast"))
782 warn_bad_function_cast = 0;
783 else if (!strcmp (p, "-Wmissing-noreturn"))
784 warn_missing_noreturn = 1;
785 else if (!strcmp (p, "-Wno-missing-noreturn"))
786 warn_missing_noreturn = 0;
787 else if (!strcmp (p, "-Wpointer-arith"))
788 warn_pointer_arith = 1;
789 else if (!strcmp (p, "-Wno-pointer-arith"))
790 warn_pointer_arith = 0;
791 else if (!strcmp (p, "-Wstrict-prototypes"))
792 warn_strict_prototypes = 1;
793 else if (!strcmp (p, "-Wno-strict-prototypes"))
794 warn_strict_prototypes = 0;
795 else if (!strcmp (p, "-Wmissing-prototypes"))
796 warn_missing_prototypes = 1;
797 else if (!strcmp (p, "-Wno-missing-prototypes"))
798 warn_missing_prototypes = 0;
799 else if (!strcmp (p, "-Wmissing-declarations"))
800 warn_missing_declarations = 1;
801 else if (!strcmp (p, "-Wno-missing-declarations"))
802 warn_missing_declarations = 0;
803 else if (!strcmp (p, "-Wredundant-decls"))
804 warn_redundant_decls = 1;
805 else if (!strcmp (p, "-Wno-redundant-decls"))
806 warn_redundant_decls = 0;
807 else if (!strcmp (p, "-Wnested-externs"))
808 warn_nested_externs = 1;
809 else if (!strcmp (p, "-Wno-nested-externs"))
810 warn_nested_externs = 0;
811 else if (!strcmp (p, "-Wtraditional"))
812 warn_traditional = 1;
813 else if (!strcmp (p, "-Wno-traditional"))
814 warn_traditional = 0;
815 else if (!strcmp (p, "-Wnon-const-format"))
816 warn_format = MAX(warn_format, 2);
817 else if (!strcmp (p, "-Wformat"))
819 warn_format_extra_args = 1;
820 warn_format = MAX(warn_format, 1);
822 else if (!strcmp (p, "-Wno-format"))
824 else if (!strcmp (p, "-Wno-format-extra-args"))
825 warn_format_extra_args = 0;
826 else if (!strcmp (p, "-Wchar-subscripts"))
827 warn_char_subscripts = 1;
828 else if (!strcmp (p, "-Wno-char-subscripts"))
829 warn_char_subscripts = 0;
830 else if (!strcmp (p, "-Wconversion"))
832 else if (!strcmp (p, "-Wno-conversion"))
834 else if (!strcmp (p, "-Wparentheses"))
835 warn_parentheses = 1;
836 else if (!strcmp (p, "-Wno-parentheses"))
837 warn_parentheses = 0;
838 else if (!strcmp (p, "-Wreturn-type"))
839 warn_return_type = 1;
840 else if (!strcmp (p, "-Wno-return-type"))
841 warn_return_type = 0;
842 else if (!strcmp (p, "-Wcomment"))
843 ; /* cpp handles this one. */
844 else if (!strcmp (p, "-Wno-comment"))
845 ; /* cpp handles this one. */
846 else if (!strcmp (p, "-Wcomments"))
847 ; /* cpp handles this one. */
848 else if (!strcmp (p, "-Wno-comments"))
849 ; /* cpp handles this one. */
850 else if (!strcmp (p, "-Wtrigraphs"))
851 ; /* cpp handles this one. */
852 else if (!strcmp (p, "-Wno-trigraphs"))
853 ; /* cpp handles this one. */
854 else if (!strcmp (p, "-Wundef"))
855 ; /* cpp handles this one. */
856 else if (!strcmp (p, "-Wno-undef"))
857 ; /* cpp handles this one. */
858 else if (!strcmp (p, "-Wimport"))
859 ; /* cpp handles this one. */
860 else if (!strcmp (p, "-Wno-import"))
861 ; /* cpp handles this one. */
862 else if (!strcmp (p, "-Wmissing-braces"))
863 warn_missing_braces = 1;
864 else if (!strcmp (p, "-Wno-missing-braces"))
865 warn_missing_braces = 0;
866 else if (!strcmp (p, "-Wmain"))
868 else if (!strncmp (p, "-Wframe-size-", 13))
870 const char *argstart = &p[13];
871 const int larger_than_val = read_integral_parameter (argstart, p, -1);
872 if (larger_than_val != -1)
874 warn_frame_size = larger_than_val;
875 warn_frame_size_flag = 1;
878 else if (!strncmp (p, "-Warglist-size-", 15))
880 const char *argstart = &p[15];
881 const int larger_than_val = read_integral_parameter (argstart, p, -1);
882 if (larger_than_val != -1)
884 warn_arglist_size = larger_than_val;
885 warn_arglist_size_flag = 1;
888 else if (!strcmp (p, "-Wno-main"))
890 else if (!strcmp (p, "-Wsign-compare"))
891 warn_sign_compare = 1;
892 else if (!strcmp (p, "-Wno-sign-compare"))
893 warn_sign_compare = 0;
894 else if (!strcmp (p, "-Wmultichar"))
896 else if (!strcmp (p, "-Wno-multichar"))
898 else if (!strcmp (p, "-Wunknown-pragmas"))
899 /* Set to greater than 1, so that even unknown pragmas in system
900 headers will be warned about. */
901 warn_unknown_pragmas = 2;
902 else if (!strcmp (p, "-Wno-unknown-pragmas"))
903 warn_unknown_pragmas = 0;
904 else if (!strcmp (p, "-Wall"))
906 /* We save the value of warn_uninitialized, since if they put
907 -Wuninitialized on the command line, we need to generate a
908 warning about not using it without also specifying -O. */
909 if (warn_uninitialized != 1)
910 warn_uninitialized = 2;
911 warn_implicit_int = 1;
912 mesg_implicit_function_declaration = 1;
913 warn_return_type = 1;
916 warn_format = MAX(warn_format, 1);
917 warn_char_subscripts = 1;
918 warn_parentheses = 1;
919 warn_missing_braces = 1;
920 /* We set this to 2 here, but 1 in -Wmain, so -ffreestanding can turn
921 it off only if it's not explicit. */
923 /* Only warn about unknown pragmas that are not in system headers. */
924 warn_unknown_pragmas = 1;
927 return strings_processed;
932 /* Hooks for print_node. */
935 print_lang_decl (file, node, indent)
936 FILE *file ATTRIBUTE_UNUSED;
937 tree node ATTRIBUTE_UNUSED;
938 int indent ATTRIBUTE_UNUSED;
943 print_lang_type (file, node, indent)
944 FILE *file ATTRIBUTE_UNUSED;
945 tree node ATTRIBUTE_UNUSED;
946 int indent ATTRIBUTE_UNUSED;
951 print_lang_identifier (file, node, indent)
956 print_node (file, "global", IDENTIFIER_GLOBAL_VALUE (node), indent + 4);
957 print_node (file, "local", IDENTIFIER_LOCAL_VALUE (node), indent + 4);
958 print_node (file, "label", IDENTIFIER_LABEL_VALUE (node), indent + 4);
959 print_node (file, "implicit", IDENTIFIER_IMPLICIT_DECL (node), indent + 4);
960 print_node (file, "error locus", IDENTIFIER_ERROR_LOCUS (node), indent + 4);
961 print_node (file, "limbo value", IDENTIFIER_LIMBO_VALUE (node), indent + 4);
964 /* Hook called at end of compilation to assume 1 elt
965 for a top-level array decl that wasn't complete before. */
968 finish_incomplete_decl (decl)
971 if (TREE_CODE (decl) == VAR_DECL)
973 tree type = TREE_TYPE (decl);
974 if (type != error_mark_node
975 && TREE_CODE (type) == ARRAY_TYPE
976 && TYPE_DOMAIN (type) == 0)
978 if (! DECL_EXTERNAL (decl))
979 warning_with_decl (decl, "array `%s' assumed to have one element");
981 complete_array_type (type, NULL_TREE, 1);
983 layout_decl (decl, 0);
988 /* Create a new `struct binding_level'. */
991 struct binding_level *
992 make_binding_level ()
995 return (struct binding_level *) xmalloc (sizeof (struct binding_level));
998 /* Nonzero if we are currently in the global binding level. */
1001 global_bindings_p ()
1003 return current_binding_level == global_binding_level;
1009 keep_next_level_flag = 1;
1012 /* Nonzero if the current level needs to have a BLOCK made. */
1017 return ((current_binding_level->keep_if_subblocks
1018 && current_binding_level->blocks != 0)
1019 || current_binding_level->keep
1020 || current_binding_level->names != 0
1021 || (current_binding_level->tags != 0
1022 && !current_binding_level->tag_transparent));
1025 /* Identify this binding level as a level of parameters.
1026 DEFINITION_FLAG is 1 for a definition, 0 for a declaration.
1027 But it turns out there is no way to pass the right value for
1028 DEFINITION_FLAG, so we ignore it. */
1031 declare_parm_level (definition_flag)
1032 int definition_flag ATTRIBUTE_UNUSED;
1034 current_binding_level->parm_flag = 1;
1037 /* Nonzero if currently making parm declarations. */
1042 return current_binding_level->parm_flag;
1045 /* Enter a new binding level.
1046 If TAG_TRANSPARENT is nonzero, do so only for the name space of variables,
1047 not for that of tags. */
1050 pushlevel (tag_transparent)
1051 int tag_transparent;
1053 register struct binding_level *newlevel = NULL_BINDING_LEVEL;
1055 /* If this is the top level of a function,
1056 just make sure that NAMED_LABELS is 0. */
1058 if (current_binding_level == global_binding_level)
1063 /* Reuse or create a struct for this binding level. */
1065 if (free_binding_level)
1067 newlevel = free_binding_level;
1068 free_binding_level = free_binding_level->level_chain;
1072 newlevel = make_binding_level ();
1075 /* Add this level to the front of the chain (stack) of levels that
1078 *newlevel = clear_binding_level;
1079 newlevel->tag_transparent
1081 || (current_binding_level
1082 ? current_binding_level->subblocks_tag_transparent
1084 newlevel->level_chain = current_binding_level;
1085 current_binding_level = newlevel;
1086 newlevel->keep = keep_next_level_flag;
1087 keep_next_level_flag = 0;
1088 newlevel->keep_if_subblocks = keep_next_if_subblocks;
1089 keep_next_if_subblocks = 0;
1092 /* Clear the limbo values of all identifiers defined in BLOCK or a subblock. */
1095 clear_limbo_values (block)
1100 for (tem = BLOCK_VARS (block); tem; tem = TREE_CHAIN (tem))
1101 if (DECL_NAME (tem) != 0)
1102 IDENTIFIER_LIMBO_VALUE (DECL_NAME (tem)) = 0;
1104 for (tem = BLOCK_SUBBLOCKS (block); tem; tem = TREE_CHAIN (tem))
1105 clear_limbo_values (tem);
1108 /* Exit a binding level.
1109 Pop the level off, and restore the state of the identifier-decl mappings
1110 that were in effect when this level was entered.
1112 If KEEP is nonzero, this level had explicit declarations, so
1113 and create a "block" (a BLOCK node) for the level
1114 to record its declarations and subblocks for symbol table output.
1116 If FUNCTIONBODY is nonzero, this level is the body of a function,
1117 so create a block as if KEEP were set and also clear out all
1120 If REVERSE is nonzero, reverse the order of decls before putting
1121 them into the BLOCK. */
1124 poplevel (keep, reverse, functionbody)
1130 /* The chain of decls was accumulated in reverse order.
1131 Put it into forward order, just for cleanliness. */
1133 tree tags = current_binding_level->tags;
1134 tree subblocks = current_binding_level->blocks;
1137 int block_previously_created;
1139 keep |= current_binding_level->keep;
1141 /* This warning is turned off because it causes warnings for
1142 declarations like `extern struct foo *x'. */
1144 /* Warn about incomplete structure types in this level. */
1145 for (link = tags; link; link = TREE_CHAIN (link))
1146 if (TYPE_SIZE (TREE_VALUE (link)) == 0)
1148 tree type = TREE_VALUE (link);
1149 tree type_name = TYPE_NAME (type);
1150 char *id = IDENTIFIER_POINTER (TREE_CODE (type_name) == IDENTIFIER_NODE
1152 : DECL_NAME (type_name));
1153 switch (TREE_CODE (type))
1156 error ("`struct %s' incomplete in scope ending here", id);
1159 error ("`union %s' incomplete in scope ending here", id);
1162 error ("`enum %s' incomplete in scope ending here", id);
1168 /* Get the decls in the order they were written.
1169 Usually current_binding_level->names is in reverse order.
1170 But parameter decls were previously put in forward order. */
1173 current_binding_level->names
1174 = decls = nreverse (current_binding_level->names);
1176 decls = current_binding_level->names;
1178 /* Output any nested inline functions within this block
1179 if they weren't already output. */
1181 for (decl = decls; decl; decl = TREE_CHAIN (decl))
1182 if (TREE_CODE (decl) == FUNCTION_DECL
1183 && ! TREE_ASM_WRITTEN (decl)
1184 && DECL_INITIAL (decl) != 0
1185 && TREE_ADDRESSABLE (decl))
1187 /* If this decl was copied from a file-scope decl
1188 on account of a block-scope extern decl,
1189 propagate TREE_ADDRESSABLE to the file-scope decl.
1191 DECL_ABSTRACT_ORIGIN can be set to itself if warn_return_type is
1192 true, since then the decl goes through save_for_inline_copying. */
1193 if (DECL_ABSTRACT_ORIGIN (decl) != 0
1194 && DECL_ABSTRACT_ORIGIN (decl) != decl)
1195 TREE_ADDRESSABLE (DECL_ABSTRACT_ORIGIN (decl)) = 1;
1196 else if (DECL_SAVED_INSNS (decl) != 0)
1198 push_function_context ();
1199 output_inline_function (decl);
1200 pop_function_context ();
1204 /* If there were any declarations or structure tags in that level,
1205 or if this level is a function body,
1206 create a BLOCK to record them for the life of this function. */
1209 block_previously_created = (current_binding_level->this_block != 0);
1210 if (block_previously_created)
1211 block = current_binding_level->this_block;
1212 else if (keep || functionbody
1213 || (current_binding_level->keep_if_subblocks && subblocks != 0))
1214 block = make_node (BLOCK);
1217 BLOCK_VARS (block) = decls;
1218 BLOCK_TYPE_TAGS (block) = tags;
1219 BLOCK_SUBBLOCKS (block) = subblocks;
1220 remember_end_note (block);
1223 /* In each subblock, record that this is its superior. */
1225 for (link = subblocks; link; link = TREE_CHAIN (link))
1226 BLOCK_SUPERCONTEXT (link) = block;
1228 /* Clear out the meanings of the local variables of this level. */
1230 for (link = decls; link; link = TREE_CHAIN (link))
1232 if (DECL_NAME (link) != 0)
1234 /* If the ident. was used or addressed via a local extern decl,
1235 don't forget that fact. */
1236 if (DECL_EXTERNAL (link))
1238 if (TREE_USED (link))
1239 TREE_USED (DECL_NAME (link)) = 1;
1240 if (TREE_ADDRESSABLE (link))
1241 TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (link)) = 1;
1243 IDENTIFIER_LOCAL_VALUE (DECL_NAME (link)) = 0;
1247 /* Restore all name-meanings of the outer levels
1248 that were shadowed by this level. */
1250 for (link = current_binding_level->shadowed; link; link = TREE_CHAIN (link))
1251 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
1253 /* If the level being exited is the top level of a function,
1254 check over all the labels, and clear out the current
1255 (function local) meanings of their names. */
1259 clear_limbo_values (block);
1261 /* If this is the top level block of a function,
1262 the vars are the function's parameters.
1263 Don't leave them in the BLOCK because they are
1264 found in the FUNCTION_DECL instead. */
1266 BLOCK_VARS (block) = 0;
1268 /* Clear out the definitions of all label names,
1269 since their scopes end here,
1270 and add them to BLOCK_VARS. */
1272 for (link = named_labels; link; link = TREE_CHAIN (link))
1274 register tree label = TREE_VALUE (link);
1276 if (DECL_INITIAL (label) == 0)
1278 error_with_decl (label, "label `%s' used but not defined");
1279 /* Avoid crashing later. */
1280 define_label (input_filename, lineno,
1283 else if (warn_unused && !TREE_USED (label))
1284 warning_with_decl (label, "label `%s' defined but not used");
1285 IDENTIFIER_LABEL_VALUE (DECL_NAME (label)) = 0;
1287 /* Put the labels into the "variables" of the
1288 top-level block, so debugger can see them. */
1289 TREE_CHAIN (label) = BLOCK_VARS (block);
1290 BLOCK_VARS (block) = label;
1294 /* Pop the current level, and free the structure for reuse. */
1297 register struct binding_level *level = current_binding_level;
1298 current_binding_level = current_binding_level->level_chain;
1300 level->level_chain = free_binding_level;
1301 free_binding_level = level;
1304 /* Dispose of the block that we just made inside some higher level. */
1306 DECL_INITIAL (current_function_decl) = block;
1309 if (!block_previously_created)
1310 current_binding_level->blocks
1311 = chainon (current_binding_level->blocks, block);
1313 /* If we did not make a block for the level just exited,
1314 any blocks made for inner levels
1315 (since they cannot be recorded as subblocks in that level)
1316 must be carried forward so they will later become subblocks
1317 of something else. */
1319 current_binding_level->blocks
1320 = chainon (current_binding_level->blocks, subblocks);
1322 /* Set the TYPE_CONTEXTs for all of the tagged types belonging to this
1323 binding contour so that they point to the appropriate construct, i.e.
1324 either to the current FUNCTION_DECL node, or else to the BLOCK node
1325 we just constructed.
1327 Note that for tagged types whose scope is just the formal parameter
1328 list for some function type specification, we can't properly set
1329 their TYPE_CONTEXTs here, because we don't have a pointer to the
1330 appropriate FUNCTION_TYPE node readily available to us. For those
1331 cases, the TYPE_CONTEXTs of the relevant tagged type nodes get set
1332 in `grokdeclarator' as soon as we have created the FUNCTION_TYPE
1333 node which will represent the "scope" for these "parameter list local"
1338 for (link = tags; link; link = TREE_CHAIN (link))
1339 TYPE_CONTEXT (TREE_VALUE (link)) = current_function_decl;
1341 for (link = tags; link; link = TREE_CHAIN (link))
1342 TYPE_CONTEXT (TREE_VALUE (link)) = block;
1345 TREE_USED (block) = 1;
1349 /* Delete the node BLOCK from the current binding level.
1350 This is used for the block inside a stmt expr ({...})
1351 so that the block can be reinserted where appropriate. */
1354 delete_block (block)
1358 if (current_binding_level->blocks == block)
1359 current_binding_level->blocks = TREE_CHAIN (block);
1360 for (t = current_binding_level->blocks; t;)
1362 if (TREE_CHAIN (t) == block)
1363 TREE_CHAIN (t) = TREE_CHAIN (block);
1367 TREE_CHAIN (block) = NULL;
1368 /* Clear TREE_USED which is always set by poplevel.
1369 The flag is set again if insert_block is called. */
1370 TREE_USED (block) = 0;
1373 /* Insert BLOCK at the end of the list of subblocks of the
1374 current binding level. This is used when a BIND_EXPR is expanded,
1375 to handle the BLOCK node inside the BIND_EXPR. */
1378 insert_block (block)
1381 TREE_USED (block) = 1;
1382 current_binding_level->blocks
1383 = chainon (current_binding_level->blocks, block);
1386 /* Set the BLOCK node for the innermost scope
1387 (the one we are currently in). */
1391 register tree block;
1393 current_binding_level->this_block = block;
1399 register struct binding_level *newlevel;
1401 /* Reuse or create a struct for this binding level. */
1403 if (free_binding_level)
1405 newlevel = free_binding_level;
1406 free_binding_level = free_binding_level->level_chain;
1410 newlevel = make_binding_level ();
1413 /* Add this level to the front of the chain (stack) of label levels. */
1415 newlevel->level_chain = label_level_chain;
1416 label_level_chain = newlevel;
1418 newlevel->names = named_labels;
1419 newlevel->shadowed = shadowed_labels;
1421 shadowed_labels = 0;
1427 register struct binding_level *level = label_level_chain;
1430 /* Clear out the definitions of the declared labels in this level.
1431 Leave in the list any ordinary, non-declared labels. */
1432 for (link = named_labels, prev = 0; link;)
1434 if (C_DECLARED_LABEL_FLAG (TREE_VALUE (link)))
1436 if (DECL_SOURCE_LINE (TREE_VALUE (link)) == 0)
1438 error_with_decl (TREE_VALUE (link),
1439 "label `%s' used but not defined");
1440 /* Avoid crashing later. */
1441 define_label (input_filename, lineno,
1442 DECL_NAME (TREE_VALUE (link)));
1444 else if (warn_unused && !TREE_USED (TREE_VALUE (link)))
1445 warning_with_decl (TREE_VALUE (link),
1446 "label `%s' defined but not used");
1447 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link))) = 0;
1449 /* Delete this element from the list. */
1450 link = TREE_CHAIN (link);
1452 TREE_CHAIN (prev) = link;
1454 named_labels = link;
1459 link = TREE_CHAIN (link);
1463 /* Bring back all the labels that were shadowed. */
1464 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
1465 if (DECL_NAME (TREE_VALUE (link)) != 0)
1466 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
1467 = TREE_VALUE (link);
1469 named_labels = chainon (named_labels, level->names);
1470 shadowed_labels = level->shadowed;
1472 /* Pop the current level, and free the structure for reuse. */
1473 label_level_chain = label_level_chain->level_chain;
1474 level->level_chain = free_binding_level;
1475 free_binding_level = level;
1478 /* Push a definition or a declaration of struct, union or enum tag "name".
1479 "type" should be the type node.
1480 We assume that the tag "name" is not already defined.
1482 Note that the definition may really be just a forward reference.
1483 In that case, the TYPE_SIZE will be zero. */
1486 pushtag (name, type)
1489 register struct binding_level *b;
1491 /* Find the proper binding level for this type tag. */
1493 for (b = current_binding_level; b->tag_transparent; b = b->level_chain)
1498 /* Record the identifier as the type's name if it has none. */
1500 if (TYPE_NAME (type) == 0)
1501 TYPE_NAME (type) = name;
1504 if (b == global_binding_level)
1505 b->tags = perm_tree_cons (name, type, b->tags);
1507 b->tags = saveable_tree_cons (name, type, b->tags);
1509 /* Create a fake NULL-named TYPE_DECL node whose TREE_TYPE will be the
1510 tagged type we just added to the current binding level. This fake
1511 NULL-named TYPE_DECL node helps dwarfout.c to know when it needs
1512 to output a representation of a tagged type, and it also gives
1513 us a convenient place to record the "scope start" address for the
1516 TYPE_STUB_DECL (type) = pushdecl (build_decl (TYPE_DECL, NULL_TREE, type));
1518 /* An approximation for now, so we can tell this is a function-scope tag.
1519 This will be updated in poplevel. */
1520 TYPE_CONTEXT (type) = DECL_CONTEXT (TYPE_STUB_DECL (type));
1523 /* Handle when a new declaration NEWDECL
1524 has the same name as an old one OLDDECL
1525 in the same binding contour.
1526 Prints an error message if appropriate.
1528 If safely possible, alter OLDDECL to look like NEWDECL, and return 1.
1529 Otherwise, return 0.
1531 When DIFFERENT_BINDING_LEVEL is true, NEWDECL is an external declaration,
1532 and OLDDECL is in an outer binding level and should thus not be changed. */
1535 duplicate_decls (newdecl, olddecl, different_binding_level)
1536 register tree newdecl, olddecl;
1537 int different_binding_level;
1539 int types_match = comptypes (TREE_TYPE (newdecl), TREE_TYPE (olddecl));
1540 int new_is_definition = (TREE_CODE (newdecl) == FUNCTION_DECL
1541 && DECL_INITIAL (newdecl) != 0);
1542 tree oldtype = TREE_TYPE (olddecl);
1543 tree newtype = TREE_TYPE (newdecl);
1546 if (TREE_CODE_CLASS (TREE_CODE (olddecl)) == 'd')
1547 DECL_MACHINE_ATTRIBUTES (newdecl)
1548 = merge_machine_decl_attributes (olddecl, newdecl);
1550 if (TREE_CODE (newtype) == ERROR_MARK
1551 || TREE_CODE (oldtype) == ERROR_MARK)
1554 /* New decl is completely inconsistent with the old one =>
1555 tell caller to replace the old one.
1556 This is always an error except in the case of shadowing a builtin. */
1557 if (TREE_CODE (olddecl) != TREE_CODE (newdecl))
1559 if (TREE_CODE (olddecl) == FUNCTION_DECL
1560 && (DECL_BUILT_IN (olddecl)
1561 || DECL_BUILT_IN_NONANSI (olddecl)))
1563 /* If you declare a built-in or predefined function name as static,
1564 the old definition is overridden,
1565 but optionally warn this was a bad choice of name. */
1566 if (!TREE_PUBLIC (newdecl))
1570 else if (DECL_BUILT_IN (olddecl))
1571 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1573 warning_with_decl (newdecl, "shadowing library function `%s'");
1575 /* Likewise, if the built-in is not ansi, then programs can
1576 override it even globally without an error. */
1577 else if (! DECL_BUILT_IN (olddecl))
1578 warning_with_decl (newdecl,
1579 "library function `%s' declared as non-function");
1581 else if (DECL_BUILT_IN_NONANSI (olddecl))
1582 warning_with_decl (newdecl,
1583 "built-in function `%s' declared as non-function");
1585 warning_with_decl (newdecl,
1586 "built-in function `%s' declared as non-function");
1590 error_with_decl (newdecl, "`%s' redeclared as different kind of symbol");
1591 error_with_decl (olddecl, "previous declaration of `%s'");
1597 /* For real parm decl following a forward decl,
1598 return 1 so old decl will be reused. */
1599 if (types_match && TREE_CODE (newdecl) == PARM_DECL
1600 && TREE_ASM_WRITTEN (olddecl) && ! TREE_ASM_WRITTEN (newdecl))
1603 /* The new declaration is the same kind of object as the old one.
1604 The declarations may partially match. Print warnings if they don't
1605 match enough. Ultimately, copy most of the information from the new
1606 decl to the old one, and keep using the old one. */
1608 if (flag_traditional && TREE_CODE (newdecl) == FUNCTION_DECL
1609 && IDENTIFIER_IMPLICIT_DECL (DECL_NAME (newdecl)) == olddecl
1610 && DECL_INITIAL (olddecl) == 0)
1611 /* If -traditional, avoid error for redeclaring fcn
1612 after implicit decl. */
1614 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1615 && DECL_BUILT_IN (olddecl))
1617 /* A function declaration for a built-in function. */
1618 if (!TREE_PUBLIC (newdecl))
1620 /* If you declare a built-in function name as static, the
1621 built-in definition is overridden,
1622 but optionally warn this was a bad choice of name. */
1624 warning_with_decl (newdecl, "shadowing built-in function `%s'");
1625 /* Discard the old built-in function. */
1628 else if (!types_match)
1630 /* Accept the return type of the new declaration if same modes. */
1631 tree oldreturntype = TREE_TYPE (oldtype);
1632 tree newreturntype = TREE_TYPE (newtype);
1634 /* Make sure we put the new type in the same obstack as the old ones.
1635 If the old types are not both in the same obstack, use the
1637 if (TYPE_OBSTACK (oldtype) == TYPE_OBSTACK (newtype))
1638 push_obstacks (TYPE_OBSTACK (oldtype), TYPE_OBSTACK (oldtype));
1641 push_obstacks_nochange ();
1642 end_temporary_allocation ();
1645 if (TYPE_MODE (oldreturntype) == TYPE_MODE (newreturntype))
1647 /* Function types may be shared, so we can't just modify
1648 the return type of olddecl's function type. */
1650 = build_function_type (newreturntype,
1651 TYPE_ARG_TYPES (oldtype));
1653 types_match = comptypes (newtype, trytype);
1657 /* Accept harmless mismatch in first argument type also.
1659 if (TYPE_ARG_TYPES (TREE_TYPE (newdecl)) != 0
1660 && TYPE_ARG_TYPES (oldtype) != 0
1661 && TREE_VALUE (TYPE_ARG_TYPES (newtype)) != 0
1662 && TREE_VALUE (TYPE_ARG_TYPES (oldtype)) != 0
1663 && (TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (newtype)))
1664 == TYPE_MODE (TREE_VALUE (TYPE_ARG_TYPES (oldtype)))))
1666 /* Function types may be shared, so we can't just modify
1667 the return type of olddecl's function type. */
1669 = build_function_type (TREE_TYPE (oldtype),
1670 tree_cons (NULL_TREE,
1671 TREE_VALUE (TYPE_ARG_TYPES (newtype)),
1672 TREE_CHAIN (TYPE_ARG_TYPES (oldtype))));
1674 types_match = comptypes (newtype, trytype);
1678 if (! different_binding_level)
1679 TREE_TYPE (olddecl) = oldtype;
1685 /* If types don't match for a built-in, throw away the built-in. */
1686 warning_with_decl (newdecl, "conflicting types for built-in function `%s'");
1690 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1691 && DECL_SOURCE_LINE (olddecl) == 0)
1693 /* A function declaration for a predeclared function
1694 that isn't actually built in. */
1695 if (!TREE_PUBLIC (newdecl))
1697 /* If you declare it as static, the
1698 default definition is overridden. */
1701 else if (!types_match)
1703 /* If the types don't match, preserve volatility indication.
1704 Later on, we will discard everything else about the
1705 default declaration. */
1706 TREE_THIS_VOLATILE (newdecl) |= TREE_THIS_VOLATILE (olddecl);
1709 /* Permit char *foo () to match void *foo (...) if not pedantic,
1710 if one of them came from a system header file. */
1711 else if (!types_match
1712 && TREE_CODE (olddecl) == FUNCTION_DECL
1713 && TREE_CODE (newdecl) == FUNCTION_DECL
1714 && TREE_CODE (TREE_TYPE (oldtype)) == POINTER_TYPE
1715 && TREE_CODE (TREE_TYPE (newtype)) == POINTER_TYPE
1716 && (DECL_IN_SYSTEM_HEADER (olddecl)
1717 || DECL_IN_SYSTEM_HEADER (newdecl))
1718 && ((TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (newtype))) == void_type_node
1719 && TYPE_ARG_TYPES (oldtype) == 0
1720 && self_promoting_args_p (TYPE_ARG_TYPES (newtype))
1721 && TREE_TYPE (TREE_TYPE (oldtype)) == char_type_node)
1723 (TREE_TYPE (TREE_TYPE (newtype)) == char_type_node
1724 && TYPE_ARG_TYPES (newtype) == 0
1725 && self_promoting_args_p (TYPE_ARG_TYPES (oldtype))
1726 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)))
1729 pedwarn_with_decl (newdecl, "conflicting types for `%s'");
1730 /* Make sure we keep void * as ret type, not char *. */
1731 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (oldtype))) == void_type_node)
1732 TREE_TYPE (newdecl) = newtype = oldtype;
1734 /* Set DECL_IN_SYSTEM_HEADER, so that if we see another declaration
1735 we will come back here again. */
1736 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
1738 else if (!types_match
1739 /* Permit char *foo (int, ...); followed by char *foo ();
1741 && ! (TREE_CODE (olddecl) == FUNCTION_DECL
1743 /* Return types must still match. */
1744 && comptypes (TREE_TYPE (oldtype),
1745 TREE_TYPE (newtype))
1746 && TYPE_ARG_TYPES (newtype) == 0))
1748 error_with_decl (newdecl, "conflicting types for `%s'");
1749 /* Check for function type mismatch
1750 involving an empty arglist vs a nonempty one. */
1751 if (TREE_CODE (olddecl) == FUNCTION_DECL
1752 && comptypes (TREE_TYPE (oldtype),
1753 TREE_TYPE (newtype))
1754 && ((TYPE_ARG_TYPES (oldtype) == 0
1755 && DECL_INITIAL (olddecl) == 0)
1757 (TYPE_ARG_TYPES (newtype) == 0
1758 && DECL_INITIAL (newdecl) == 0)))
1760 /* Classify the problem further. */
1761 register tree t = TYPE_ARG_TYPES (oldtype);
1763 t = TYPE_ARG_TYPES (newtype);
1764 for (; t; t = TREE_CHAIN (t))
1766 register tree type = TREE_VALUE (t);
1768 if (TREE_CHAIN (t) == 0
1769 && TYPE_MAIN_VARIANT (type) != void_type_node)
1771 error ("A parameter list with an ellipsis can't match an empty parameter name list declaration.");
1775 if (TYPE_MAIN_VARIANT (type) == float_type_node
1776 || C_PROMOTING_INTEGER_TYPE_P (type))
1778 error ("An argument type that has a default promotion can't match an empty parameter name list declaration.");
1783 error_with_decl (olddecl, "previous declaration of `%s'");
1787 errmsg = redeclaration_error_message (newdecl, olddecl);
1793 error_with_decl (newdecl, "redefinition of `%s'");
1796 error_with_decl (newdecl, "redeclaration of `%s'");
1799 error_with_decl (newdecl, "conflicting declarations of `%s'");
1805 error_with_decl (olddecl,
1806 ((DECL_INITIAL (olddecl)
1807 && current_binding_level == global_binding_level)
1808 ? "`%s' previously defined here"
1809 : "`%s' previously declared here"));
1811 else if (TREE_CODE (newdecl) == TYPE_DECL
1812 && (DECL_IN_SYSTEM_HEADER (olddecl)
1813 || DECL_IN_SYSTEM_HEADER (newdecl)))
1815 warning_with_decl (newdecl, "redefinition of `%s'");
1818 ((DECL_INITIAL (olddecl)
1819 && current_binding_level == global_binding_level)
1820 ? "`%s' previously defined here"
1821 : "`%s' previously declared here"));
1823 else if (TREE_CODE (olddecl) == FUNCTION_DECL
1824 && DECL_INITIAL (olddecl) != 0
1825 && TYPE_ARG_TYPES (oldtype) == 0
1826 && TYPE_ARG_TYPES (newtype) != 0
1827 && TYPE_ACTUAL_ARG_TYPES (oldtype) != 0)
1829 register tree type, parm;
1831 /* Prototype decl follows defn w/o prototype. */
1833 for (parm = TYPE_ACTUAL_ARG_TYPES (oldtype),
1834 type = TYPE_ARG_TYPES (newtype),
1837 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type), nargs++)
1839 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1840 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1842 warning_with_decl (newdecl, "prototype for `%s' follows");
1843 warning_with_decl (olddecl, "non-prototype definition here");
1846 if (TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == void_type_node
1847 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
1849 error_with_decl (newdecl, "prototype for `%s' follows and number of arguments doesn't match");
1850 error_with_decl (olddecl, "non-prototype definition here");
1854 /* Type for passing arg must be consistent
1855 with that declared for the arg. */
1856 if (! comptypes (TREE_VALUE (parm), TREE_VALUE (type))
1857 /* If -traditional, allow `unsigned int' instead of `int'
1858 in the prototype. */
1859 && (! (flag_traditional
1860 && TYPE_MAIN_VARIANT (TREE_VALUE (parm)) == integer_type_node
1861 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node)))
1863 error_with_decl (newdecl,
1864 "prototype for `%s' follows and argument %d doesn't match",
1866 error_with_decl (olddecl, "non-prototype definition here");
1872 /* Warn about mismatches in various flags. */
1875 /* Warn if function is now inline
1876 but was previously declared not inline and has been called. */
1877 if (TREE_CODE (olddecl) == FUNCTION_DECL
1878 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1879 && TREE_USED (olddecl))
1880 warning_with_decl (newdecl,
1881 "`%s' declared inline after being called");
1882 if (TREE_CODE (olddecl) == FUNCTION_DECL
1883 && ! DECL_INLINE (olddecl) && DECL_INLINE (newdecl)
1884 && DECL_INITIAL (olddecl) != 0)
1885 warning_with_decl (newdecl,
1886 "`%s' declared inline after its definition");
1888 /* If pedantic, warn when static declaration follows a non-static
1889 declaration. Otherwise, do so only for functions. */
1890 if ((pedantic || TREE_CODE (olddecl) == FUNCTION_DECL)
1891 && TREE_PUBLIC (olddecl)
1892 && !TREE_PUBLIC (newdecl))
1893 warning_with_decl (newdecl, "static declaration for `%s' follows non-static");
1895 /* If warn_traditional, warn when a non-static function
1896 declaration follows a static one. */
1897 if (warn_traditional
1898 && TREE_CODE (olddecl) == FUNCTION_DECL
1899 && !TREE_PUBLIC (olddecl)
1900 && TREE_PUBLIC (newdecl))
1901 warning_with_decl (newdecl, "non-static declaration for `%s' follows static");
1903 /* Warn when const declaration follows a non-const
1904 declaration, but not for functions. */
1905 if (TREE_CODE (olddecl) != FUNCTION_DECL
1906 && !TREE_READONLY (olddecl)
1907 && TREE_READONLY (newdecl))
1908 warning_with_decl (newdecl, "const declaration for `%s' follows non-const");
1909 /* These bits are logically part of the type, for variables.
1910 But not for functions
1911 (where qualifiers are not valid ANSI anyway). */
1912 else if (pedantic && TREE_CODE (olddecl) != FUNCTION_DECL
1913 && (TREE_READONLY (newdecl) != TREE_READONLY (olddecl)
1914 || TREE_THIS_VOLATILE (newdecl) != TREE_THIS_VOLATILE (olddecl)))
1915 pedwarn_with_decl (newdecl, "type qualifiers for `%s' conflict with previous decl");
1919 /* Optionally warn about more than one declaration for the same name. */
1920 if (errmsg == 0 && warn_redundant_decls && DECL_SOURCE_LINE (olddecl) != 0
1921 /* Don't warn about a function declaration
1922 followed by a definition. */
1923 && !(TREE_CODE (newdecl) == FUNCTION_DECL && DECL_INITIAL (newdecl) != 0
1924 && DECL_INITIAL (olddecl) == 0)
1925 /* Don't warn about extern decl followed by (tentative) definition. */
1926 && !(DECL_EXTERNAL (olddecl) && ! DECL_EXTERNAL (newdecl)))
1928 warning_with_decl (newdecl, "redundant redeclaration of `%s' in same scope");
1929 warning_with_decl (olddecl, "previous declaration of `%s'");
1932 /* Copy all the DECL_... slots specified in the new decl
1933 except for any that we copy here from the old type.
1935 Past this point, we don't change OLDTYPE and NEWTYPE
1936 even if we change the types of NEWDECL and OLDDECL. */
1940 /* When copying info to olddecl, we store into write_olddecl
1941 instead. This allows us to avoid modifying olddecl when
1942 different_binding_level is true. */
1943 tree write_olddecl = different_binding_level ? newdecl : olddecl;
1945 /* Make sure we put the new type in the same obstack as the old ones.
1946 If the old types are not both in the same obstack, use the permanent
1948 if (TYPE_OBSTACK (oldtype) == TYPE_OBSTACK (newtype))
1949 push_obstacks (TYPE_OBSTACK (oldtype), TYPE_OBSTACK (oldtype));
1952 push_obstacks_nochange ();
1953 end_temporary_allocation ();
1956 /* Merge the data types specified in the two decls. */
1957 if (TREE_CODE (newdecl) != FUNCTION_DECL || !DECL_BUILT_IN (olddecl))
1959 if (different_binding_level)
1961 = build_type_attribute_variant
1963 merge_attributes (TYPE_ATTRIBUTES (newtype),
1964 TYPE_ATTRIBUTES (oldtype)));
1967 = TREE_TYPE (olddecl)
1968 = common_type (newtype, oldtype);
1971 /* Lay the type out, unless already done. */
1972 if (oldtype != TREE_TYPE (newdecl))
1974 if (TREE_TYPE (newdecl) != error_mark_node)
1975 layout_type (TREE_TYPE (newdecl));
1976 if (TREE_CODE (newdecl) != FUNCTION_DECL
1977 && TREE_CODE (newdecl) != TYPE_DECL
1978 && TREE_CODE (newdecl) != CONST_DECL)
1979 layout_decl (newdecl, 0);
1983 /* Since the type is OLDDECL's, make OLDDECL's size go with. */
1984 DECL_SIZE (newdecl) = DECL_SIZE (olddecl);
1985 DECL_MODE (newdecl) = DECL_MODE (olddecl);
1986 if (TREE_CODE (olddecl) != FUNCTION_DECL)
1987 if (DECL_ALIGN (olddecl) > DECL_ALIGN (newdecl))
1988 DECL_ALIGN (newdecl) = DECL_ALIGN (olddecl);
1991 /* Keep the old rtl since we can safely use it. */
1992 DECL_RTL (newdecl) = DECL_RTL (olddecl);
1994 /* Merge the type qualifiers. */
1995 if (DECL_BUILT_IN_NONANSI (olddecl) && TREE_THIS_VOLATILE (olddecl)
1996 && !TREE_THIS_VOLATILE (newdecl))
1997 TREE_THIS_VOLATILE (write_olddecl) = 0;
1998 if (TREE_READONLY (newdecl))
1999 TREE_READONLY (write_olddecl) = 1;
2000 if (TREE_THIS_VOLATILE (newdecl))
2002 TREE_THIS_VOLATILE (write_olddecl) = 1;
2003 if (TREE_CODE (newdecl) == VAR_DECL)
2004 make_var_volatile (newdecl);
2007 /* Keep source location of definition rather than declaration. */
2008 /* When called with different_binding_level set, keep the old
2009 information so that meaningful diagnostics can be given. */
2010 if (DECL_INITIAL (newdecl) == 0 && DECL_INITIAL (olddecl) != 0
2011 && ! different_binding_level)
2013 DECL_SOURCE_LINE (newdecl) = DECL_SOURCE_LINE (olddecl);
2014 DECL_SOURCE_FILE (newdecl) = DECL_SOURCE_FILE (olddecl);
2017 /* Merge the unused-warning information. */
2018 if (DECL_IN_SYSTEM_HEADER (olddecl))
2019 DECL_IN_SYSTEM_HEADER (newdecl) = 1;
2020 else if (DECL_IN_SYSTEM_HEADER (newdecl))
2021 DECL_IN_SYSTEM_HEADER (write_olddecl) = 1;
2023 /* Merge the initialization information. */
2024 /* When called with different_binding_level set, don't copy over
2025 DECL_INITIAL, so that we don't accidentally change function
2026 declarations into function definitions. */
2027 if (DECL_INITIAL (newdecl) == 0 && ! different_binding_level)
2028 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
2030 /* Merge the section attribute.
2031 We want to issue an error if the sections conflict but that must be
2032 done later in decl_attributes since we are called before attributes
2034 if (DECL_SECTION_NAME (newdecl) == NULL_TREE)
2035 DECL_SECTION_NAME (newdecl) = DECL_SECTION_NAME (olddecl);
2037 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2039 DECL_STATIC_CONSTRUCTOR(newdecl) |= DECL_STATIC_CONSTRUCTOR(olddecl);
2040 DECL_STATIC_DESTRUCTOR (newdecl) |= DECL_STATIC_DESTRUCTOR (olddecl);
2042 DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (newdecl)
2043 |= DECL_NO_INSTRUMENT_FUNCTION_ENTRY_EXIT (olddecl);
2044 DECL_NO_CHECK_MEMORY_USAGE (newdecl)
2045 |= DECL_NO_CHECK_MEMORY_USAGE (olddecl);
2050 /* If cannot merge, then use the new type and qualifiers,
2051 and don't preserve the old rtl. */
2052 else if (! different_binding_level)
2054 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
2055 TREE_READONLY (olddecl) = TREE_READONLY (newdecl);
2056 TREE_THIS_VOLATILE (olddecl) = TREE_THIS_VOLATILE (newdecl);
2057 TREE_SIDE_EFFECTS (olddecl) = TREE_SIDE_EFFECTS (newdecl);
2060 /* Merge the storage class information. */
2061 DECL_WEAK (newdecl) |= DECL_WEAK (olddecl);
2062 /* For functions, static overrides non-static. */
2063 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2065 TREE_PUBLIC (newdecl) &= TREE_PUBLIC (olddecl);
2066 /* This is since we don't automatically
2067 copy the attributes of NEWDECL into OLDDECL. */
2068 /* No need to worry about different_binding_level here because
2069 then TREE_PUBLIC (newdecl) was true. */
2070 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
2071 /* If this clears `static', clear it in the identifier too. */
2072 if (! TREE_PUBLIC (olddecl))
2073 TREE_PUBLIC (DECL_NAME (olddecl)) = 0;
2075 if (DECL_EXTERNAL (newdecl))
2077 TREE_STATIC (newdecl) = TREE_STATIC (olddecl);
2078 DECL_EXTERNAL (newdecl) = DECL_EXTERNAL (olddecl);
2079 /* An extern decl does not override previous storage class. */
2080 TREE_PUBLIC (newdecl) = TREE_PUBLIC (olddecl);
2081 if (! DECL_EXTERNAL (newdecl))
2082 DECL_CONTEXT (newdecl) = DECL_CONTEXT (olddecl);
2086 TREE_STATIC (olddecl) = TREE_STATIC (newdecl);
2087 TREE_PUBLIC (olddecl) = TREE_PUBLIC (newdecl);
2090 /* If either decl says `inline', this fn is inline,
2091 unless its definition was passed already. */
2092 if (DECL_INLINE (newdecl) && DECL_INITIAL (olddecl) == 0)
2093 DECL_INLINE (olddecl) = 1;
2094 DECL_INLINE (newdecl) = DECL_INLINE (olddecl);
2096 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2098 if (DECL_BUILT_IN (olddecl))
2100 /* Get rid of any built-in function if new arg types don't match it
2101 or if we have a function definition. */
2102 if (! types_match || new_is_definition)
2104 if (! different_binding_level)
2106 TREE_TYPE (olddecl) = TREE_TYPE (newdecl);
2107 DECL_BUILT_IN (olddecl) = 0;
2112 /* If redeclaring a builtin function, and not a definition,
2113 it stays built in. */
2114 DECL_BUILT_IN (newdecl) = 1;
2115 DECL_FUNCTION_CODE (newdecl) = DECL_FUNCTION_CODE (olddecl);
2118 /* Also preserve various other info from the definition. */
2119 else if (! new_is_definition)
2120 DECL_FRAME_SIZE (newdecl) = DECL_FRAME_SIZE (olddecl);
2121 if (! new_is_definition)
2123 DECL_RESULT (newdecl) = DECL_RESULT (olddecl);
2124 /* When called with different_binding_level set, don't copy over
2125 DECL_INITIAL, so that we don't accidentally change function
2126 declarations into function definitions. */
2127 if (! different_binding_level)
2128 DECL_INITIAL (newdecl) = DECL_INITIAL (olddecl);
2129 DECL_SAVED_INSNS (newdecl) = DECL_SAVED_INSNS (olddecl);
2130 DECL_ARGUMENTS (newdecl) = DECL_ARGUMENTS (olddecl);
2131 if (DECL_INLINE (newdecl))
2132 DECL_ABSTRACT_ORIGIN (newdecl) = DECL_ORIGIN (olddecl);
2135 if (different_binding_level)
2137 /* Don't output a duplicate symbol or debugging information for this
2140 Do not set TREE_ASM_WRITTEN for a FUNCTION_DECL since we may actually
2141 just have two declarations without a definition. VAR_DECLs may need
2142 the same treatment, I'm not sure. */
2143 if (TREE_CODE (newdecl) == FUNCTION_DECL)
2144 DECL_IGNORED_P (newdecl) = 1;
2146 TREE_ASM_WRITTEN (newdecl) = DECL_IGNORED_P (newdecl) = 1;
2150 /* Copy most of the decl-specific fields of NEWDECL into OLDDECL.
2151 But preserve OLDDECL's DECL_UID. */
2153 register unsigned olddecl_uid = DECL_UID (olddecl);
2155 bcopy ((char *) newdecl + sizeof (struct tree_common),
2156 (char *) olddecl + sizeof (struct tree_common),
2157 sizeof (struct tree_decl) - sizeof (struct tree_common));
2158 DECL_UID (olddecl) = olddecl_uid;
2161 /* NEWDECL contains the merged attribute lists.
2162 Update OLDDECL to be the same. */
2163 DECL_MACHINE_ATTRIBUTES (olddecl) = DECL_MACHINE_ATTRIBUTES (newdecl);
2168 /* Record a decl-node X as belonging to the current lexical scope.
2169 Check for errors (such as an incompatible declaration for the same
2170 name already seen in the same scope).
2172 Returns either X or an old decl for the same name.
2173 If an old decl is returned, it may have been smashed
2174 to agree with what X says. */
2181 register tree name = DECL_NAME (x);
2182 register struct binding_level *b = current_binding_level;
2184 DECL_CONTEXT (x) = current_function_decl;
2185 /* A local extern declaration for a function doesn't constitute nesting.
2186 A local auto declaration does, since it's a forward decl
2187 for a nested function coming later. */
2188 if (TREE_CODE (x) == FUNCTION_DECL && DECL_INITIAL (x) == 0
2189 && DECL_EXTERNAL (x))
2190 DECL_CONTEXT (x) = 0;
2192 if (warn_nested_externs && DECL_EXTERNAL (x) && b != global_binding_level
2193 && x != IDENTIFIER_IMPLICIT_DECL (name)
2194 /* Don't print error messages for __FUNCTION__ and __PRETTY_FUNCTION__ */
2195 && !DECL_IN_SYSTEM_HEADER (x))
2196 warning ("nested extern declaration of `%s'", IDENTIFIER_POINTER (name));
2202 int different_binding_level = 0;
2204 t = lookup_name_current_level (name);
2205 /* Don't type check externs here when -traditional. This is so that
2206 code with conflicting declarations inside blocks will get warnings
2207 not errors. X11 for instance depends on this. */
2208 if (! t && DECL_EXTERNAL (x) && TREE_PUBLIC (x) && ! flag_traditional)
2210 t = IDENTIFIER_GLOBAL_VALUE (name);
2211 /* Type decls at global scope don't conflict with externs declared
2212 inside lexical blocks. */
2213 if (t && TREE_CODE (t) == TYPE_DECL)
2215 different_binding_level = 1;
2217 if (t != 0 && t == error_mark_node)
2218 /* error_mark_node is 0 for a while during initialization! */
2221 error_with_decl (x, "`%s' used prior to declaration");
2226 file = DECL_SOURCE_FILE (t);
2227 line = DECL_SOURCE_LINE (t);
2230 /* If this decl is `static' and an implicit decl was seen previously,
2231 warn. But don't complain if -traditional,
2232 since traditional compilers don't complain. */
2233 if (! flag_traditional && TREE_PUBLIC (name)
2234 /* Don't test for DECL_EXTERNAL, because grokdeclarator
2235 sets this for all functions. */
2236 && ! TREE_PUBLIC (x)
2237 && (TREE_CODE (x) == FUNCTION_DECL || b == global_binding_level)
2238 /* We used to warn also for explicit extern followed by static,
2239 but sometimes you need to do it that way. */
2240 && IDENTIFIER_IMPLICIT_DECL (name) != 0)
2242 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2243 IDENTIFIER_POINTER (name));
2244 pedwarn_with_file_and_line
2245 (DECL_SOURCE_FILE (IDENTIFIER_IMPLICIT_DECL (name)),
2246 DECL_SOURCE_LINE (IDENTIFIER_IMPLICIT_DECL (name)),
2247 "previous declaration of `%s'",
2248 IDENTIFIER_POINTER (name));
2249 TREE_THIS_VOLATILE (name) = 1;
2252 if (t != 0 && duplicate_decls (x, t, different_binding_level))
2254 if (TREE_CODE (t) == PARM_DECL)
2256 /* Don't allow more than one "real" duplicate
2257 of a forward parm decl. */
2258 TREE_ASM_WRITTEN (t) = TREE_ASM_WRITTEN (x);
2264 /* If we are processing a typedef statement, generate a whole new
2265 ..._TYPE node (which will be just an variant of the existing
2266 ..._TYPE node with identical properties) and then install the
2267 TYPE_DECL node generated to represent the typedef name as the
2268 TYPE_NAME of this brand new (duplicate) ..._TYPE node.
2270 The whole point here is to end up with a situation where each
2271 and every ..._TYPE node the compiler creates will be uniquely
2272 associated with AT MOST one node representing a typedef name.
2273 This way, even though the compiler substitutes corresponding
2274 ..._TYPE nodes for TYPE_DECL (i.e. "typedef name") nodes very
2275 early on, later parts of the compiler can always do the reverse
2276 translation and get back the corresponding typedef name. For
2279 typedef struct S MY_TYPE;
2282 Later parts of the compiler might only know that `object' was of
2283 type `struct S' if it were not for code just below. With this
2284 code however, later parts of the compiler see something like:
2286 struct S' == struct S
2287 typedef struct S' MY_TYPE;
2290 And they can then deduce (from the node for type struct S') that
2291 the original object declaration was:
2295 Being able to do this is important for proper support of protoize,
2296 and also for generating precise symbolic debugging information
2297 which takes full account of the programmer's (typedef) vocabulary.
2299 Obviously, we don't want to generate a duplicate ..._TYPE node if
2300 the TYPE_DECL node that we are now processing really represents a
2301 standard built-in type.
2303 Since all standard types are effectively declared at line zero
2304 in the source file, we can easily check to see if we are working
2305 on a standard type by checking the current value of lineno. */
2307 if (TREE_CODE (x) == TYPE_DECL)
2309 if (DECL_SOURCE_LINE (x) == 0)
2311 if (TYPE_NAME (TREE_TYPE (x)) == 0)
2312 TYPE_NAME (TREE_TYPE (x)) = x;
2314 else if (TREE_TYPE (x) != error_mark_node
2315 && DECL_ORIGINAL_TYPE (x) == NULL_TREE)
2317 tree tt = TREE_TYPE (x);
2318 DECL_ORIGINAL_TYPE (x) = tt;
2319 tt = build_type_copy (tt);
2325 /* Multiple external decls of the same identifier ought to match.
2326 Check against both global declarations (when traditional) and out of
2327 scope (limbo) block level declarations.
2329 We get warnings about inline functions where they are defined.
2330 Avoid duplicate warnings where they are used. */
2331 if (TREE_PUBLIC (x) && ! DECL_INLINE (x))
2335 if (flag_traditional && IDENTIFIER_GLOBAL_VALUE (name) != 0
2336 && (DECL_EXTERNAL (IDENTIFIER_GLOBAL_VALUE (name))
2337 || TREE_PUBLIC (IDENTIFIER_GLOBAL_VALUE (name))))
2338 decl = IDENTIFIER_GLOBAL_VALUE (name);
2339 else if (IDENTIFIER_LIMBO_VALUE (name) != 0)
2340 /* Decls in limbo are always extern, so no need to check that. */
2341 decl = IDENTIFIER_LIMBO_VALUE (name);
2345 if (decl && ! comptypes (TREE_TYPE (x), TREE_TYPE (decl))
2346 /* If old decl is built-in, we already warned if we should. */
2347 && !DECL_BUILT_IN (decl))
2349 pedwarn_with_decl (x,
2350 "type mismatch with previous external decl");
2351 pedwarn_with_decl (decl, "previous external decl of `%s'");
2355 /* If a function has had an implicit declaration, and then is defined,
2356 make sure they are compatible. */
2358 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2359 && IDENTIFIER_GLOBAL_VALUE (name) == 0
2360 && TREE_CODE (x) == FUNCTION_DECL
2361 && ! comptypes (TREE_TYPE (x),
2362 TREE_TYPE (IDENTIFIER_IMPLICIT_DECL (name))))
2364 warning_with_decl (x, "type mismatch with previous implicit declaration");
2365 warning_with_decl (IDENTIFIER_IMPLICIT_DECL (name),
2366 "previous implicit declaration of `%s'");
2369 /* In PCC-compatibility mode, extern decls of vars with no current decl
2370 take effect at top level no matter where they are. */
2371 if (flag_traditional && DECL_EXTERNAL (x)
2372 && lookup_name (name) == 0)
2374 tree type = TREE_TYPE (x);
2376 /* But don't do this if the type contains temporary nodes. */
2379 if (type == error_mark_node)
2381 if (! TREE_PERMANENT (type))
2383 warning_with_decl (x, "type of external `%s' is not global");
2384 /* By exiting the loop early, we leave TYPE nonzero,
2385 and thus prevent globalization of the decl. */
2388 else if (TREE_CODE (type) == FUNCTION_TYPE
2389 && TYPE_ARG_TYPES (type) != 0)
2390 /* The types might not be truly local,
2391 but the list of arg types certainly is temporary.
2392 Since prototypes are nontraditional,
2393 ok not to do the traditional thing. */
2395 type = TREE_TYPE (type);
2399 b = global_binding_level;
2402 /* This name is new in its binding level.
2403 Install the new declaration and return it. */
2404 if (b == global_binding_level)
2406 /* Install a global value. */
2408 /* If the first global decl has external linkage,
2409 warn if we later see static one. */
2410 if (IDENTIFIER_GLOBAL_VALUE (name) == 0 && TREE_PUBLIC (x))
2411 TREE_PUBLIC (name) = 1;
2413 IDENTIFIER_GLOBAL_VALUE (name) = x;
2415 /* We no longer care about any previous block level declarations. */
2416 IDENTIFIER_LIMBO_VALUE (name) = 0;
2418 /* Don't forget if the function was used via an implicit decl. */
2419 if (IDENTIFIER_IMPLICIT_DECL (name)
2420 && TREE_USED (IDENTIFIER_IMPLICIT_DECL (name)))
2421 TREE_USED (x) = 1, TREE_USED (name) = 1;
2423 /* Don't forget if its address was taken in that way. */
2424 if (IDENTIFIER_IMPLICIT_DECL (name)
2425 && TREE_ADDRESSABLE (IDENTIFIER_IMPLICIT_DECL (name)))
2426 TREE_ADDRESSABLE (x) = 1;
2428 /* Warn about mismatches against previous implicit decl. */
2429 if (IDENTIFIER_IMPLICIT_DECL (name) != 0
2430 /* If this real decl matches the implicit, don't complain. */
2431 && ! (TREE_CODE (x) == FUNCTION_DECL
2432 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (x)))
2433 == integer_type_node)))
2434 pedwarn ("`%s' was previously implicitly declared to return `int'",
2435 IDENTIFIER_POINTER (name));
2437 /* If this decl is `static' and an `extern' was seen previously,
2438 that is erroneous. */
2439 if (TREE_PUBLIC (name)
2440 && ! TREE_PUBLIC (x) && ! DECL_EXTERNAL (x))
2442 /* Okay to redeclare an ANSI built-in as static. */
2443 if (t != 0 && DECL_BUILT_IN (t))
2445 /* Okay to declare a non-ANSI built-in as anything. */
2446 else if (t != 0 && DECL_BUILT_IN_NONANSI (t))
2448 /* Okay to have global type decl after an earlier extern
2449 declaration inside a lexical block. */
2450 else if (TREE_CODE (x) == TYPE_DECL)
2452 else if (IDENTIFIER_IMPLICIT_DECL (name))
2454 if (! TREE_THIS_VOLATILE (name))
2455 pedwarn ("`%s' was declared implicitly `extern' and later `static'",
2456 IDENTIFIER_POINTER (name));
2459 pedwarn ("`%s' was declared `extern' and later `static'",
2460 IDENTIFIER_POINTER (name));
2465 /* Here to install a non-global value. */
2466 tree oldlocal = IDENTIFIER_LOCAL_VALUE (name);
2467 tree oldglobal = IDENTIFIER_GLOBAL_VALUE (name);
2468 IDENTIFIER_LOCAL_VALUE (name) = x;
2470 /* If this is an extern function declaration, see if we
2471 have a global definition or declaration for the function. */
2473 && DECL_EXTERNAL (x) && !DECL_INLINE (x)
2475 && TREE_CODE (x) == FUNCTION_DECL
2476 && TREE_CODE (oldglobal) == FUNCTION_DECL)
2478 /* We have one. Their types must agree. */
2479 if (! comptypes (TREE_TYPE (x),
2480 TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (name))))
2481 pedwarn_with_decl (x, "extern declaration of `%s' doesn't match global one");
2484 /* Inner extern decl is inline if global one is.
2485 Copy enough to really inline it. */
2486 if (DECL_INLINE (oldglobal))
2488 DECL_INLINE (x) = DECL_INLINE (oldglobal);
2489 DECL_INITIAL (x) = (current_function_decl == oldglobal
2490 ? 0 : DECL_INITIAL (oldglobal));
2491 DECL_SAVED_INSNS (x) = DECL_SAVED_INSNS (oldglobal);
2492 DECL_FRAME_SIZE (x) = DECL_FRAME_SIZE (oldglobal);
2493 DECL_ARGUMENTS (x) = DECL_ARGUMENTS (oldglobal);
2494 DECL_RESULT (x) = DECL_RESULT (oldglobal);
2495 TREE_ASM_WRITTEN (x) = TREE_ASM_WRITTEN (oldglobal);
2496 DECL_ABSTRACT_ORIGIN (x) = DECL_ORIGIN (oldglobal);
2498 /* Inner extern decl is built-in if global one is. */
2499 if (DECL_BUILT_IN (oldglobal))
2501 DECL_BUILT_IN (x) = DECL_BUILT_IN (oldglobal);
2502 DECL_FUNCTION_CODE (x) = DECL_FUNCTION_CODE (oldglobal);
2504 /* Keep the arg types from a file-scope fcn defn. */
2505 if (TYPE_ARG_TYPES (TREE_TYPE (oldglobal)) != 0
2506 && DECL_INITIAL (oldglobal)
2507 && TYPE_ARG_TYPES (TREE_TYPE (x)) == 0)
2508 TREE_TYPE (x) = TREE_TYPE (oldglobal);
2512 #if 0 /* This case is probably sometimes the right thing to do. */
2513 /* If we have a local external declaration,
2514 then any file-scope declaration should not
2515 have been static. */
2516 if (oldlocal == 0 && oldglobal != 0
2517 && !TREE_PUBLIC (oldglobal)
2518 && DECL_EXTERNAL (x) && TREE_PUBLIC (x))
2519 warning ("`%s' locally external but globally static",
2520 IDENTIFIER_POINTER (name));
2523 /* If we have a local external declaration,
2524 and no file-scope declaration has yet been seen,
2525 then if we later have a file-scope decl it must not be static. */
2527 && DECL_EXTERNAL (x)
2531 TREE_PUBLIC (name) = 1;
2533 /* Save this decl, so that we can do type checking against
2534 other decls after it falls out of scope.
2536 Only save it once. This prevents temporary decls created in
2537 expand_inline_function from being used here, since this
2538 will have been set when the inline function was parsed.
2539 It also helps give slightly better warnings. */
2540 if (IDENTIFIER_LIMBO_VALUE (name) == 0)
2541 IDENTIFIER_LIMBO_VALUE (name) = x;
2544 /* Warn if shadowing an argument at the top level of the body. */
2545 if (oldlocal != 0 && !DECL_EXTERNAL (x)
2546 /* This warning doesn't apply to the parms of a nested fcn. */
2547 && ! current_binding_level->parm_flag
2548 /* Check that this is one level down from the parms. */
2549 && current_binding_level->level_chain->parm_flag
2550 /* Check that the decl being shadowed
2551 comes from the parm level, one level up. */
2552 && chain_member (oldlocal, current_binding_level->level_chain->names))
2554 if (TREE_CODE (oldlocal) == PARM_DECL)
2555 pedwarn ("declaration of `%s' shadows a parameter",
2556 IDENTIFIER_POINTER (name));
2558 pedwarn ("declaration of `%s' shadows a symbol from the parameter list",
2559 IDENTIFIER_POINTER (name));
2562 /* Maybe warn if shadowing something else. */
2563 else if (warn_shadow && !DECL_EXTERNAL (x)
2564 /* No shadow warnings for internally generated vars. */
2565 && DECL_SOURCE_LINE (x) != 0
2566 /* No shadow warnings for vars made for inlining. */
2567 && ! DECL_FROM_INLINE (x))
2569 char *id = IDENTIFIER_POINTER (name);
2571 if (TREE_CODE (x) == PARM_DECL
2572 && current_binding_level->level_chain->parm_flag)
2573 /* Don't warn about the parm names in function declarator
2574 within a function declarator.
2575 It would be nice to avoid warning in any function
2576 declarator in a declaration, as opposed to a definition,
2577 but there is no way to tell it's not a definition. */
2579 else if (oldlocal != 0 && TREE_CODE (oldlocal) == PARM_DECL)
2580 warning ("declaration of `%s' shadows a parameter", id);
2581 else if (oldlocal != 0)
2582 warning ("declaration of `%s' shadows previous local", id);
2583 else if (IDENTIFIER_GLOBAL_VALUE (name) != 0
2584 && IDENTIFIER_GLOBAL_VALUE (name) != error_mark_node)
2585 warning ("declaration of `%s' shadows global declaration", id);
2588 /* If storing a local value, there may already be one (inherited).
2589 If so, record it for restoration when this binding level ends. */
2591 b->shadowed = tree_cons (name, oldlocal, b->shadowed);
2594 /* Keep count of variables in this level with incomplete type. */
2595 if (TYPE_SIZE (TREE_TYPE (x)) == 0)
2599 /* Put decls on list in reverse order.
2600 We will reverse them later if necessary. */
2601 TREE_CHAIN (x) = b->names;
2607 /* Like pushdecl, only it places X in GLOBAL_BINDING_LEVEL, if appropriate. */
2610 pushdecl_top_level (x)
2614 register struct binding_level *b = current_binding_level;
2616 current_binding_level = global_binding_level;
2618 current_binding_level = b;
2622 /* Generate an implicit declaration for identifier FUNCTIONID
2623 as a function of type int (). Print a warning if appropriate. */
2626 implicitly_declare (functionid)
2630 int traditional_warning = 0;
2631 /* Only one "implicit declaration" warning per identifier. */
2632 int implicit_warning;
2634 /* Save the decl permanently so we can warn if definition follows. */
2635 push_obstacks_nochange ();
2636 end_temporary_allocation ();
2638 /* We used to reuse an old implicit decl here,
2639 but this loses with inline functions because it can clobber
2640 the saved decl chains. */
2641 /* if (IDENTIFIER_IMPLICIT_DECL (functionid) != 0)
2642 decl = IDENTIFIER_IMPLICIT_DECL (functionid);
2644 decl = build_decl (FUNCTION_DECL, functionid, default_function_type);
2646 /* Warn of implicit decl following explicit local extern decl.
2647 This is probably a program designed for traditional C. */
2648 if (TREE_PUBLIC (functionid) && IDENTIFIER_GLOBAL_VALUE (functionid) == 0)
2649 traditional_warning = 1;
2651 /* Warn once of an implicit declaration. */
2652 implicit_warning = (IDENTIFIER_IMPLICIT_DECL (functionid) == 0);
2654 DECL_EXTERNAL (decl) = 1;
2655 TREE_PUBLIC (decl) = 1;
2657 /* Record that we have an implicit decl and this is it. */
2658 IDENTIFIER_IMPLICIT_DECL (functionid) = decl;
2660 /* ANSI standard says implicit declarations are in the innermost block.
2661 So we record the decl in the standard fashion.
2662 If flag_traditional is set, pushdecl does it top-level. */
2665 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
2666 maybe_objc_check_decl (decl);
2668 rest_of_decl_compilation (decl, NULL_PTR, 0, 0);
2670 if (mesg_implicit_function_declaration && implicit_warning)
2672 if (mesg_implicit_function_declaration == 2)
2673 error ("implicit declaration of function `%s'",
2674 IDENTIFIER_POINTER (functionid));
2676 warning ("implicit declaration of function `%s'",
2677 IDENTIFIER_POINTER (functionid));
2679 else if (warn_traditional && traditional_warning)
2680 warning ("function `%s' was previously declared within a block",
2681 IDENTIFIER_POINTER (functionid));
2683 /* Write a record describing this implicit function declaration to the
2684 prototypes file (if requested). */
2686 gen_aux_info_record (decl, 0, 1, 0);
2693 /* Return zero if the declaration NEWDECL is valid
2694 when the declaration OLDDECL (assumed to be for the same name)
2695 has already been seen.
2696 Otherwise return 1 if NEWDECL is a redefinition, 2 if it is a redeclaration,
2697 and 3 if it is a conflicting declaration. */
2700 redeclaration_error_message (newdecl, olddecl)
2701 tree newdecl, olddecl;
2703 if (TREE_CODE (newdecl) == TYPE_DECL)
2705 if (flag_traditional && TREE_TYPE (newdecl) == TREE_TYPE (olddecl))
2707 /* pushdecl creates distinct types for TYPE_DECLs by calling
2708 build_type_copy, so the above comparison generally fails. We do
2709 another test against the TYPE_MAIN_VARIANT of the olddecl, which
2710 is equivalent to what this code used to do before the build_type_copy
2711 call. The variant type distinction should not matter for traditional
2712 code, because it doesn't have type qualifiers. */
2713 if (flag_traditional
2714 && TYPE_MAIN_VARIANT (TREE_TYPE (olddecl)) == TREE_TYPE (newdecl))
2716 if (DECL_IN_SYSTEM_HEADER (olddecl) || DECL_IN_SYSTEM_HEADER (newdecl))
2720 else if (TREE_CODE (newdecl) == FUNCTION_DECL)
2722 /* Declarations of functions can insist on internal linkage
2723 but they can't be inconsistent with internal linkage,
2724 so there can be no error on that account.
2725 However defining the same name twice is no good. */
2726 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0
2727 /* However, defining once as extern inline and a second
2728 time in another way is ok. */
2729 && !(DECL_INLINE (olddecl) && DECL_EXTERNAL (olddecl)
2730 && !(DECL_INLINE (newdecl) && DECL_EXTERNAL (newdecl))))
2734 else if (current_binding_level == global_binding_level)
2736 /* Objects declared at top level: */
2737 /* If at least one is a reference, it's ok. */
2738 if (DECL_EXTERNAL (newdecl) || DECL_EXTERNAL (olddecl))
2740 /* Reject two definitions. */
2741 if (DECL_INITIAL (olddecl) != 0 && DECL_INITIAL (newdecl) != 0)
2743 /* Now we have two tentative defs, or one tentative and one real def. */
2744 /* Insist that the linkage match. */
2745 if (TREE_PUBLIC (olddecl) != TREE_PUBLIC (newdecl))
2749 else if (current_binding_level->parm_flag
2750 && TREE_ASM_WRITTEN (olddecl) && !TREE_ASM_WRITTEN (newdecl))
2754 /* Newdecl has block scope. If olddecl has block scope also, then
2755 reject two definitions, and reject a definition together with an
2756 external reference. Otherwise, it is OK, because newdecl must
2757 be an extern reference to olddecl. */
2758 if (!(DECL_EXTERNAL (newdecl) && DECL_EXTERNAL (olddecl))
2759 && DECL_CONTEXT (newdecl) == DECL_CONTEXT (olddecl))
2765 /* Get the LABEL_DECL corresponding to identifier ID as a label.
2766 Create one if none exists so far for the current function.
2767 This function is called for both label definitions and label references. */
2773 register tree decl = IDENTIFIER_LABEL_VALUE (id);
2775 if (current_function_decl == 0)
2777 error ("label %s referenced outside of any function",
2778 IDENTIFIER_POINTER (id));
2782 /* Use a label already defined or ref'd with this name. */
2785 /* But not if it is inherited and wasn't declared to be inheritable. */
2786 if (DECL_CONTEXT (decl) != current_function_decl
2787 && ! C_DECLARED_LABEL_FLAG (decl))
2788 return shadow_label (id);
2792 decl = build_decl (LABEL_DECL, id, void_type_node);
2794 /* Make sure every label has an rtx. */
2797 /* A label not explicitly declared must be local to where it's ref'd. */
2798 DECL_CONTEXT (decl) = current_function_decl;
2800 DECL_MODE (decl) = VOIDmode;
2802 /* Say where one reference is to the label,
2803 for the sake of the error if it is not defined. */
2804 DECL_SOURCE_LINE (decl) = lineno;
2805 DECL_SOURCE_FILE (decl) = input_filename;
2807 IDENTIFIER_LABEL_VALUE (id) = decl;
2809 named_labels = tree_cons (NULL_TREE, decl, named_labels);
2814 /* Make a label named NAME in the current function,
2815 shadowing silently any that may be inherited from containing functions
2816 or containing scopes.
2818 Note that valid use, if the label being shadowed
2819 comes from another scope in the same function,
2820 requires calling declare_nonlocal_label right away. */
2826 register tree decl = IDENTIFIER_LABEL_VALUE (name);
2832 /* Check to make sure that the label hasn't already been declared
2833 at this label scope */
2834 for (dup = named_labels; dup; dup = TREE_CHAIN (dup))
2835 if (TREE_VALUE (dup) == decl)
2837 error ("duplicate label declaration `%s'",
2838 IDENTIFIER_POINTER (name));
2839 error_with_decl (TREE_VALUE (dup),
2840 "this is a previous declaration");
2841 /* Just use the previous declaration. */
2842 return lookup_label (name);
2845 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2846 IDENTIFIER_LABEL_VALUE (name) = decl = 0;
2849 return lookup_label (name);
2852 /* Define a label, specifying the location in the source file.
2853 Return the LABEL_DECL node for the label, if the definition is valid.
2854 Otherwise return 0. */
2857 define_label (filename, line, name)
2862 tree decl = lookup_label (name);
2864 /* If label with this name is known from an outer context, shadow it. */
2865 if (decl != 0 && DECL_CONTEXT (decl) != current_function_decl)
2867 shadowed_labels = tree_cons (NULL_TREE, decl, shadowed_labels);
2868 IDENTIFIER_LABEL_VALUE (name) = 0;
2869 decl = lookup_label (name);
2872 if (DECL_INITIAL (decl) != 0)
2874 error ("duplicate label `%s'", IDENTIFIER_POINTER (name));
2879 /* Mark label as having been defined. */
2880 DECL_INITIAL (decl) = error_mark_node;
2881 /* Say where in the source. */
2882 DECL_SOURCE_FILE (decl) = filename;
2883 DECL_SOURCE_LINE (decl) = line;
2888 /* Return the list of declarations of the current level.
2889 Note that this list is in reverse order unless/until
2890 you nreverse it; and when you do nreverse it, you must
2891 store the result back using `storedecls' or you will lose. */
2896 return current_binding_level->names;
2899 /* Return the list of type-tags (for structs, etc) of the current level. */
2904 return current_binding_level->tags;
2907 /* Store the list of declarations of the current level.
2908 This is done for the parameter declarations of a function being defined,
2909 after they are modified in the light of any missing parameters. */
2915 current_binding_level->names = decls;
2918 /* Similarly, store the list of tags of the current level. */
2924 current_binding_level->tags = tags;
2927 /* Given NAME, an IDENTIFIER_NODE,
2928 return the structure (or union or enum) definition for that name.
2929 Searches binding levels from BINDING_LEVEL up to the global level.
2930 If THISLEVEL_ONLY is nonzero, searches only the specified context
2931 (but skips any tag-transparent contexts to find one that is
2932 meaningful for tags).
2933 CODE says which kind of type the caller wants;
2934 it is RECORD_TYPE or UNION_TYPE or ENUMERAL_TYPE.
2935 If the wrong kind of type is found, an error is reported. */
2938 lookup_tag (code, name, binding_level, thislevel_only)
2939 enum tree_code code;
2940 struct binding_level *binding_level;
2944 register struct binding_level *level;
2946 for (level = binding_level; level; level = level->level_chain)
2949 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2951 if (TREE_PURPOSE (tail) == name)
2953 if (TREE_CODE (TREE_VALUE (tail)) != code)
2955 /* Definition isn't the kind we were looking for. */
2956 pending_invalid_xref = name;
2957 pending_invalid_xref_file = input_filename;
2958 pending_invalid_xref_line = lineno;
2960 return TREE_VALUE (tail);
2963 if (thislevel_only && ! level->tag_transparent)
2969 /* Print an error message now
2970 for a recent invalid struct, union or enum cross reference.
2971 We don't print them immediately because they are not invalid
2972 when used in the `struct foo;' construct for shadowing. */
2975 pending_xref_error ()
2977 if (pending_invalid_xref != 0)
2978 error_with_file_and_line (pending_invalid_xref_file,
2979 pending_invalid_xref_line,
2980 "`%s' defined as wrong kind of tag",
2981 IDENTIFIER_POINTER (pending_invalid_xref));
2982 pending_invalid_xref = 0;
2985 /* Given a type, find the tag that was defined for it and return the tag name.
2986 Otherwise return 0. */
2989 lookup_tag_reverse (type)
2992 register struct binding_level *level;
2994 for (level = current_binding_level; level; level = level->level_chain)
2997 for (tail = level->tags; tail; tail = TREE_CHAIN (tail))
2999 if (TREE_VALUE (tail) == type)
3000 return TREE_PURPOSE (tail);
3006 /* Look up NAME in the current binding level and its superiors
3007 in the namespace of variables, functions and typedefs.
3008 Return a ..._DECL node of some kind representing its definition,
3009 or return 0 if it is undefined. */
3016 if (current_binding_level != global_binding_level
3017 && IDENTIFIER_LOCAL_VALUE (name))
3018 val = IDENTIFIER_LOCAL_VALUE (name);
3020 val = IDENTIFIER_GLOBAL_VALUE (name);
3024 /* Similar to `lookup_name' but look only at current binding level. */
3027 lookup_name_current_level (name)
3032 if (current_binding_level == global_binding_level)
3033 return IDENTIFIER_GLOBAL_VALUE (name);
3035 if (IDENTIFIER_LOCAL_VALUE (name) == 0)
3038 for (t = current_binding_level->names; t; t = TREE_CHAIN (t))
3039 if (DECL_NAME (t) == name)
3045 /* Create the predefined scalar types of C,
3046 and some nodes representing standard constants (0, 1, (void *) 0).
3047 Initialize the global binding level.
3048 Make definitions for built-in primitive functions. */
3051 init_decl_processing ()
3053 register tree endlink;
3054 /* Either char* or void*. */
3055 tree traditional_ptr_type_node;
3056 /* Data types of memcpy and strlen. */
3057 tree memcpy_ftype, memset_ftype, strlen_ftype;
3058 tree void_ftype_any, ptr_ftype_void, ptr_ftype_ptr;
3059 int wchar_type_size;
3061 tree array_domain_type;
3063 current_function_decl = NULL;
3064 named_labels = NULL;
3065 current_binding_level = NULL_BINDING_LEVEL;
3066 free_binding_level = NULL_BINDING_LEVEL;
3067 pushlevel (0); /* make the binding_level structure for global names */
3068 global_binding_level = current_binding_level;
3070 /* Define `int' and `char' first so that dbx will output them first. */
3072 integer_type_node = make_signed_type (INT_TYPE_SIZE);
3073 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_INT],
3074 integer_type_node));
3076 /* Define `char', which is like either `signed char' or `unsigned char'
3077 but not the same as either. */
3081 ? make_signed_type (CHAR_TYPE_SIZE)
3082 : make_unsigned_type (CHAR_TYPE_SIZE));
3083 pushdecl (build_decl (TYPE_DECL, get_identifier ("char"),
3086 long_integer_type_node = make_signed_type (LONG_TYPE_SIZE);
3087 pushdecl (build_decl (TYPE_DECL, get_identifier ("long int"),
3088 long_integer_type_node));
3090 unsigned_type_node = make_unsigned_type (INT_TYPE_SIZE);
3091 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned int"),
3092 unsigned_type_node));
3094 long_unsigned_type_node = make_unsigned_type (LONG_TYPE_SIZE);
3095 pushdecl (build_decl (TYPE_DECL, get_identifier ("long unsigned int"),
3096 long_unsigned_type_node));
3098 long_long_integer_type_node = make_signed_type (LONG_LONG_TYPE_SIZE);
3099 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long int"),
3100 long_long_integer_type_node));
3102 long_long_unsigned_type_node = make_unsigned_type (LONG_LONG_TYPE_SIZE);
3103 pushdecl (build_decl (TYPE_DECL, get_identifier ("long long unsigned int"),
3104 long_long_unsigned_type_node));
3106 short_integer_type_node = make_signed_type (SHORT_TYPE_SIZE);
3107 pushdecl (build_decl (TYPE_DECL, get_identifier ("short int"),
3108 short_integer_type_node));
3110 short_unsigned_type_node = make_unsigned_type (SHORT_TYPE_SIZE);
3111 pushdecl (build_decl (TYPE_DECL, get_identifier ("short unsigned int"),
3112 short_unsigned_type_node));
3114 /* `unsigned long' is the standard type for sizeof.
3115 Traditionally, use a signed type.
3116 Note that stddef.h uses `unsigned long',
3117 and this must agree, even if long and int are the same size. */
3119 (TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (SIZE_TYPE))));
3120 if (flag_traditional && TREE_UNSIGNED (sizetype))
3121 set_sizetype (signed_type (sizetype));
3124 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (PTRDIFF_TYPE)));
3126 error_mark_node = make_node (ERROR_MARK);
3127 TREE_TYPE (error_mark_node) = error_mark_node;
3129 /* Define both `signed char' and `unsigned char'. */
3130 signed_char_type_node = make_signed_type (CHAR_TYPE_SIZE);
3131 pushdecl (build_decl (TYPE_DECL, get_identifier ("signed char"),
3132 signed_char_type_node));
3134 unsigned_char_type_node = make_unsigned_type (CHAR_TYPE_SIZE);
3135 pushdecl (build_decl (TYPE_DECL, get_identifier ("unsigned char"),
3136 unsigned_char_type_node));
3138 intQI_type_node = make_signed_type (GET_MODE_BITSIZE (QImode));
3139 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intQI_type_node));
3141 intHI_type_node = make_signed_type (GET_MODE_BITSIZE (HImode));
3142 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intHI_type_node));
3144 intSI_type_node = make_signed_type (GET_MODE_BITSIZE (SImode));
3145 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intSI_type_node));
3147 intDI_type_node = make_signed_type (GET_MODE_BITSIZE (DImode));
3148 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intDI_type_node));
3150 #if HOST_BITS_PER_WIDE_INT >= 64
3151 intTI_type_node = make_signed_type (GET_MODE_BITSIZE (TImode));
3152 pushdecl (build_decl (TYPE_DECL, NULL_TREE, intTI_type_node));
3155 unsigned_intQI_type_node = make_unsigned_type (GET_MODE_BITSIZE (QImode));
3156 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intQI_type_node));
3158 unsigned_intHI_type_node = make_unsigned_type (GET_MODE_BITSIZE (HImode));
3159 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intHI_type_node));
3161 unsigned_intSI_type_node = make_unsigned_type (GET_MODE_BITSIZE (SImode));
3162 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intSI_type_node));
3164 unsigned_intDI_type_node = make_unsigned_type (GET_MODE_BITSIZE (DImode));
3165 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intDI_type_node));
3167 #if HOST_BITS_PER_WIDE_INT >= 64
3168 unsigned_intTI_type_node = make_unsigned_type (GET_MODE_BITSIZE (TImode));
3169 pushdecl (build_decl (TYPE_DECL, NULL_TREE, unsigned_intTI_type_node));
3172 float_type_node = make_node (REAL_TYPE);
3173 TYPE_PRECISION (float_type_node) = FLOAT_TYPE_SIZE;
3174 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_FLOAT],
3176 layout_type (float_type_node);
3178 double_type_node = make_node (REAL_TYPE);
3179 if (flag_short_double)
3180 TYPE_PRECISION (double_type_node) = FLOAT_TYPE_SIZE;
3182 TYPE_PRECISION (double_type_node) = DOUBLE_TYPE_SIZE;
3183 pushdecl (build_decl (TYPE_DECL, ridpointers[(int) RID_DOUBLE],
3185 layout_type (double_type_node);
3187 long_double_type_node = make_node (REAL_TYPE);
3188 TYPE_PRECISION (long_double_type_node) = LONG_DOUBLE_TYPE_SIZE;
3189 pushdecl (build_decl (TYPE_DECL, get_identifier ("long double"),
3190 long_double_type_node));
3191 layout_type (long_double_type_node);
3193 complex_integer_type_node = make_node (COMPLEX_TYPE);
3194 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex int"),
3195 complex_integer_type_node));
3196 TREE_TYPE (complex_integer_type_node) = integer_type_node;
3197 layout_type (complex_integer_type_node);
3199 complex_float_type_node = make_node (COMPLEX_TYPE);
3200 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex float"),
3201 complex_float_type_node));
3202 TREE_TYPE (complex_float_type_node) = float_type_node;
3203 layout_type (complex_float_type_node);
3205 complex_double_type_node = make_node (COMPLEX_TYPE);
3206 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex double"),
3207 complex_double_type_node));
3208 TREE_TYPE (complex_double_type_node) = double_type_node;
3209 layout_type (complex_double_type_node);
3211 complex_long_double_type_node = make_node (COMPLEX_TYPE);
3212 pushdecl (build_decl (TYPE_DECL, get_identifier ("complex long double"),
3213 complex_long_double_type_node));
3214 TREE_TYPE (complex_long_double_type_node) = long_double_type_node;
3215 layout_type (complex_long_double_type_node);
3218 = TREE_TYPE (IDENTIFIER_GLOBAL_VALUE (get_identifier (WCHAR_TYPE)));
3219 wchar_type_size = TYPE_PRECISION (wchar_type_node);
3220 signed_wchar_type_node = signed_type (wchar_type_node);
3221 unsigned_wchar_type_node = unsigned_type (wchar_type_node);
3223 integer_zero_node = build_int_2 (0, 0);
3224 TREE_TYPE (integer_zero_node) = integer_type_node;
3225 integer_one_node = build_int_2 (1, 0);
3226 TREE_TYPE (integer_one_node) = integer_type_node;
3228 boolean_type_node = integer_type_node;
3229 boolean_true_node = integer_one_node;
3230 boolean_false_node = integer_zero_node;
3232 size_zero_node = build_int_2 (0, 0);
3233 TREE_TYPE (size_zero_node) = sizetype;
3234 size_one_node = build_int_2 (1, 0);
3235 TREE_TYPE (size_one_node) = sizetype;
3237 void_type_node = make_node (VOID_TYPE);
3238 pushdecl (build_decl (TYPE_DECL,
3239 ridpointers[(int) RID_VOID], void_type_node));
3240 layout_type (void_type_node); /* Uses integer_zero_node */
3241 /* We are not going to have real types in C with less than byte alignment,
3242 so we might as well not have any types that claim to have it. */
3243 TYPE_ALIGN (void_type_node) = BITS_PER_UNIT;
3245 null_pointer_node = build_int_2 (0, 0);
3246 TREE_TYPE (null_pointer_node) = build_pointer_type (void_type_node);
3247 layout_type (TREE_TYPE (null_pointer_node));
3249 string_type_node = build_pointer_type (char_type_node);
3250 const_string_type_node
3251 = build_pointer_type (build_type_variant (char_type_node, 1, 0));
3253 /* Make a type to be the domain of a few array types
3254 whose domains don't really matter.
3255 200 is small enough that it always fits in size_t
3256 and large enough that it can hold most function names for the
3257 initializations of __FUNCTION__ and __PRETTY_FUNCTION__. */
3258 array_domain_type = build_index_type (build_int_2 (200, 0));
3260 /* make a type for arrays of characters.
3261 With luck nothing will ever really depend on the length of this
3263 char_array_type_node
3264 = build_array_type (char_type_node, array_domain_type);
3265 /* Likewise for arrays of ints. */
3267 = build_array_type (integer_type_node, array_domain_type);
3268 /* This is for wide string constants. */
3269 wchar_array_type_node
3270 = build_array_type (wchar_type_node, array_domain_type);
3272 default_function_type
3273 = build_function_type (integer_type_node, NULL_TREE);
3275 ptr_type_node = build_pointer_type (void_type_node);
3277 = build_pointer_type (build_type_variant (void_type_node, 1, 0));
3279 endlink = tree_cons (NULL_TREE, void_type_node, NULL_TREE);
3282 = build_function_type (void_type_node, NULL_TREE);
3285 = build_function_type (float_type_node,
3286 tree_cons (NULL_TREE, float_type_node, endlink));
3289 = build_function_type (double_type_node,
3290 tree_cons (NULL_TREE, double_type_node, endlink));
3292 ldouble_ftype_ldouble
3293 = build_function_type (long_double_type_node,
3294 tree_cons (NULL_TREE, long_double_type_node,
3297 double_ftype_double_double
3298 = build_function_type (double_type_node,
3299 tree_cons (NULL_TREE, double_type_node,
3300 tree_cons (NULL_TREE,
3301 double_type_node, endlink)));
3304 = build_function_type (integer_type_node,
3305 tree_cons (NULL_TREE, integer_type_node, endlink));
3308 = build_function_type (long_integer_type_node,
3309 tree_cons (NULL_TREE,
3310 long_integer_type_node, endlink));
3312 void_ftype_ptr_ptr_int
3313 = build_function_type (void_type_node,
3314 tree_cons (NULL_TREE, ptr_type_node,
3315 tree_cons (NULL_TREE, ptr_type_node,
3316 tree_cons (NULL_TREE,
3320 int_ftype_cptr_cptr_sizet
3321 = build_function_type (integer_type_node,
3322 tree_cons (NULL_TREE, const_ptr_type_node,
3323 tree_cons (NULL_TREE, const_ptr_type_node,
3324 tree_cons (NULL_TREE,
3328 void_ftype_ptr_int_int
3329 = build_function_type (void_type_node,
3330 tree_cons (NULL_TREE, ptr_type_node,
3331 tree_cons (NULL_TREE, integer_type_node,
3332 tree_cons (NULL_TREE,
3336 string_ftype_ptr_ptr /* strcpy prototype */
3337 = build_function_type (string_type_node,
3338 tree_cons (NULL_TREE, string_type_node,
3339 tree_cons (NULL_TREE,
3340 const_string_type_node,
3343 int_ftype_string_string /* strcmp prototype */
3344 = build_function_type (integer_type_node,
3345 tree_cons (NULL_TREE, const_string_type_node,
3346 tree_cons (NULL_TREE,
3347 const_string_type_node,
3350 strlen_ftype /* strlen prototype */
3351 = build_function_type (flag_traditional ? integer_type_node : sizetype,
3352 tree_cons (NULL_TREE, const_string_type_node,
3355 traditional_ptr_type_node
3356 = (flag_traditional ? string_type_node : ptr_type_node);
3358 memcpy_ftype /* memcpy prototype */
3359 = build_function_type (traditional_ptr_type_node,
3360 tree_cons (NULL_TREE, ptr_type_node,
3361 tree_cons (NULL_TREE, const_ptr_type_node,
3362 tree_cons (NULL_TREE,
3366 memset_ftype /* memset prototype */
3367 = build_function_type (traditional_ptr_type_node,
3368 tree_cons (NULL_TREE, ptr_type_node,
3369 tree_cons (NULL_TREE, integer_type_node,
3370 tree_cons (NULL_TREE,
3374 ptr_ftype_void = build_function_type (ptr_type_node, endlink);
3376 = build_function_type (ptr_type_node,
3377 tree_cons (NULL_TREE, ptr_type_node, endlink));
3379 builtin_function ("__builtin_constant_p", default_function_type,
3380 BUILT_IN_CONSTANT_P, NULL_PTR);
3382 builtin_function ("__builtin_return_address",
3383 build_function_type (ptr_type_node,
3384 tree_cons (NULL_TREE,
3387 BUILT_IN_RETURN_ADDRESS, NULL_PTR);
3389 builtin_function ("__builtin_frame_address",
3390 build_function_type (ptr_type_node,
3391 tree_cons (NULL_TREE,
3394 BUILT_IN_FRAME_ADDRESS, NULL_PTR);
3396 builtin_function ("__builtin_aggregate_incoming_address",
3397 build_function_type (ptr_type_node, NULL_TREE),
3398 BUILT_IN_AGGREGATE_INCOMING_ADDRESS, NULL_PTR);
3400 /* Hooks for the DWARF 2 __throw routine. */
3401 builtin_function ("__builtin_unwind_init",
3402 build_function_type (void_type_node, endlink),
3403 BUILT_IN_UNWIND_INIT, NULL_PTR);
3404 builtin_function ("__builtin_dwarf_cfa", ptr_ftype_void,
3405 BUILT_IN_DWARF_CFA, NULL_PTR);
3406 builtin_function ("__builtin_dwarf_fp_regnum",
3407 build_function_type (unsigned_type_node, endlink),
3408 BUILT_IN_DWARF_FP_REGNUM, NULL_PTR);
3409 builtin_function ("__builtin_dwarf_reg_size", int_ftype_int,
3410 BUILT_IN_DWARF_REG_SIZE, NULL_PTR);
3411 builtin_function ("__builtin_frob_return_addr", ptr_ftype_ptr,
3412 BUILT_IN_FROB_RETURN_ADDR, NULL_PTR);
3413 builtin_function ("__builtin_extract_return_addr", ptr_ftype_ptr,
3414 BUILT_IN_EXTRACT_RETURN_ADDR, NULL_PTR);
3416 ("__builtin_eh_return",
3417 build_function_type (void_type_node,
3418 tree_cons (NULL_TREE, ptr_type_node,
3419 tree_cons (NULL_TREE,
3420 type_for_mode (ptr_mode, 0),
3421 tree_cons (NULL_TREE,
3424 BUILT_IN_EH_RETURN, NULL_PTR);
3426 builtin_function ("__builtin_alloca",
3427 build_function_type (ptr_type_node,
3428 tree_cons (NULL_TREE,
3431 BUILT_IN_ALLOCA, "alloca");
3432 builtin_function ("__builtin_ffs", int_ftype_int, BUILT_IN_FFS, NULL_PTR);
3433 /* Define alloca, ffs as builtins.
3434 Declare _exit just to mark it as volatile. */
3435 if (! flag_no_builtin && !flag_no_nonansi_builtin)
3437 temp = builtin_function ("alloca",
3438 build_function_type (ptr_type_node,
3439 tree_cons (NULL_TREE,
3442 BUILT_IN_ALLOCA, NULL_PTR);
3443 /* Suppress error if redefined as a non-function. */
3444 DECL_BUILT_IN_NONANSI (temp) = 1;
3445 temp = builtin_function ("ffs", int_ftype_int, BUILT_IN_FFS, NULL_PTR);
3446 /* Suppress error if redefined as a non-function. */
3447 DECL_BUILT_IN_NONANSI (temp) = 1;
3448 temp = builtin_function ("_exit", void_ftype_any, NOT_BUILT_IN,
3450 TREE_THIS_VOLATILE (temp) = 1;
3451 TREE_SIDE_EFFECTS (temp) = 1;
3452 /* Suppress error if redefined as a non-function. */
3453 DECL_BUILT_IN_NONANSI (temp) = 1;
3456 builtin_function ("__builtin_abs", int_ftype_int, BUILT_IN_ABS, NULL_PTR);
3457 builtin_function ("__builtin_fabsf", float_ftype_float, BUILT_IN_FABS,
3459 builtin_function ("__builtin_fabs", double_ftype_double, BUILT_IN_FABS,
3461 builtin_function ("__builtin_fabsl", ldouble_ftype_ldouble, BUILT_IN_FABS,
3463 builtin_function ("__builtin_labs", long_ftype_long, BUILT_IN_LABS,
3465 builtin_function ("__builtin_saveregs",
3466 build_function_type (ptr_type_node, NULL_TREE),
3467 BUILT_IN_SAVEREGS, NULL_PTR);
3468 /* EXPAND_BUILTIN_VARARGS is obsolete. */
3470 builtin_function ("__builtin_varargs",
3471 build_function_type (ptr_type_node,
3472 tree_cons (NULL_TREE,
3475 BUILT_IN_VARARGS, NULL_PTR);
3477 builtin_function ("__builtin_classify_type", default_function_type,
3478 BUILT_IN_CLASSIFY_TYPE, NULL_PTR);
3479 builtin_function ("__builtin_next_arg",
3480 build_function_type (ptr_type_node, NULL_TREE),
3481 BUILT_IN_NEXT_ARG, NULL_PTR);
3482 builtin_function ("__builtin_args_info",
3483 build_function_type (integer_type_node,
3484 tree_cons (NULL_TREE,
3487 BUILT_IN_ARGS_INFO, NULL_PTR);
3489 /* Untyped call and return. */
3490 builtin_function ("__builtin_apply_args",
3491 build_function_type (ptr_type_node, NULL_TREE),
3492 BUILT_IN_APPLY_ARGS, NULL_PTR);
3494 temp = tree_cons (NULL_TREE,
3495 build_pointer_type (build_function_type (void_type_node,
3497 tree_cons (NULL_TREE,
3499 tree_cons (NULL_TREE,
3502 builtin_function ("__builtin_apply",
3503 build_function_type (ptr_type_node, temp),
3504 BUILT_IN_APPLY, NULL_PTR);
3505 builtin_function ("__builtin_return",
3506 build_function_type (void_type_node,
3507 tree_cons (NULL_TREE,
3510 BUILT_IN_RETURN, NULL_PTR);
3512 /* Currently under experimentation. */
3513 builtin_function ("__builtin_memcpy", memcpy_ftype,
3514 BUILT_IN_MEMCPY, "memcpy");
3515 builtin_function ("__builtin_memcmp", int_ftype_cptr_cptr_sizet,
3516 BUILT_IN_MEMCMP, "memcmp");
3517 builtin_function ("__builtin_memset", memset_ftype,
3518 BUILT_IN_MEMSET, "memset");
3519 builtin_function ("__builtin_strcmp", int_ftype_string_string,
3520 BUILT_IN_STRCMP, "strcmp");
3521 builtin_function ("__builtin_strcpy", string_ftype_ptr_ptr,
3522 BUILT_IN_STRCPY, "strcpy");
3523 builtin_function ("__builtin_strlen", strlen_ftype,
3524 BUILT_IN_STRLEN, "strlen");
3525 builtin_function ("__builtin_sqrtf", float_ftype_float,
3526 BUILT_IN_FSQRT, "sqrtf");
3527 builtin_function ("__builtin_fsqrt", double_ftype_double,
3528 BUILT_IN_FSQRT, "sqrt");
3529 builtin_function ("__builtin_sqrtl", ldouble_ftype_ldouble,
3530 BUILT_IN_FSQRT, "sqrtl");
3531 builtin_function ("__builtin_sinf", float_ftype_float,
3532 BUILT_IN_SIN, "sinf");
3533 builtin_function ("__builtin_sin", double_ftype_double,
3534 BUILT_IN_SIN, "sin");
3535 builtin_function ("__builtin_sinl", ldouble_ftype_ldouble,
3536 BUILT_IN_SIN, "sinl");
3537 builtin_function ("__builtin_cosf", float_ftype_float,
3538 BUILT_IN_COS, "cosf");
3539 builtin_function ("__builtin_cos", double_ftype_double,
3540 BUILT_IN_COS, "cos");
3541 builtin_function ("__builtin_cosl", ldouble_ftype_ldouble,
3542 BUILT_IN_COS, "cosl");
3543 builtin_function ("__builtin_setjmp",
3544 build_function_type (integer_type_node,
3545 tree_cons (NULL_TREE,
3546 ptr_type_node, endlink)),
3547 BUILT_IN_SETJMP, NULL_PTR);
3548 builtin_function ("__builtin_longjmp",
3551 tree_cons (NULL, ptr_type_node,
3552 tree_cons (NULL_TREE,
3555 BUILT_IN_LONGJMP, NULL_PTR);
3556 builtin_function ("__builtin_trap",
3557 build_function_type (void_type_node, endlink),
3558 BUILT_IN_TRAP, NULL_PTR);
3560 /* In an ANSI C program, it is okay to supply built-in meanings
3561 for these functions, since applications cannot validly use them
3562 with any other meaning.
3563 However, honor the -fno-builtin option. */
3564 if (!flag_no_builtin)
3566 builtin_function ("abs", int_ftype_int, BUILT_IN_ABS, NULL_PTR);
3567 builtin_function ("fabsf", float_ftype_float, BUILT_IN_FABS, NULL_PTR);
3568 builtin_function ("fabs", double_ftype_double, BUILT_IN_FABS, NULL_PTR);
3569 builtin_function ("fabsl", ldouble_ftype_ldouble, BUILT_IN_FABS,
3571 builtin_function ("labs", long_ftype_long, BUILT_IN_LABS, NULL_PTR);
3572 builtin_function ("memcpy", memcpy_ftype, BUILT_IN_MEMCPY, NULL_PTR);
3573 builtin_function ("memcmp", int_ftype_cptr_cptr_sizet, BUILT_IN_MEMCMP,
3575 builtin_function ("memset", memset_ftype, BUILT_IN_MEMSET, NULL_PTR);
3576 builtin_function ("strcmp", int_ftype_string_string, BUILT_IN_STRCMP,
3578 builtin_function ("strcpy", string_ftype_ptr_ptr, BUILT_IN_STRCPY,
3580 builtin_function ("strlen", strlen_ftype, BUILT_IN_STRLEN, NULL_PTR);
3581 builtin_function ("sqrtf", float_ftype_float, BUILT_IN_FSQRT, NULL_PTR);
3582 builtin_function ("sqrt", double_ftype_double, BUILT_IN_FSQRT, NULL_PTR);
3583 builtin_function ("sqrtl", ldouble_ftype_ldouble, BUILT_IN_FSQRT,
3585 builtin_function ("sinf", float_ftype_float, BUILT_IN_SIN, NULL_PTR);
3586 builtin_function ("sin", double_ftype_double, BUILT_IN_SIN, NULL_PTR);
3587 builtin_function ("sinl", ldouble_ftype_ldouble, BUILT_IN_SIN, NULL_PTR);
3588 builtin_function ("cosf", float_ftype_float, BUILT_IN_COS, NULL_PTR);
3589 builtin_function ("cos", double_ftype_double, BUILT_IN_COS, NULL_PTR);
3590 builtin_function ("cosl", ldouble_ftype_ldouble, BUILT_IN_COS, NULL_PTR);
3592 /* Declare these functions volatile
3593 to avoid spurious "control drops through" warnings. */
3594 /* Don't specify the argument types, to avoid errors
3595 from certain code which isn't valid in ANSI but which exists. */
3596 temp = builtin_function ("abort", void_ftype_any, NOT_BUILT_IN,
3598 TREE_THIS_VOLATILE (temp) = 1;
3599 TREE_SIDE_EFFECTS (temp) = 1;
3600 temp = builtin_function ("exit", void_ftype_any, NOT_BUILT_IN, NULL_PTR);
3601 TREE_THIS_VOLATILE (temp) = 1;
3602 TREE_SIDE_EFFECTS (temp) = 1;
3606 /* Support for these has not been written in either expand_builtin
3607 or build_function_call. */
3608 builtin_function ("__builtin_div", default_ftype, BUILT_IN_DIV, NULL_PTR);
3609 builtin_function ("__builtin_ldiv", default_ftype, BUILT_IN_LDIV, NULL_PTR);
3610 builtin_function ("__builtin_ffloor", double_ftype_double, BUILT_IN_FFLOOR,
3612 builtin_function ("__builtin_fceil", double_ftype_double, BUILT_IN_FCEIL,
3614 builtin_function ("__builtin_fmod", double_ftype_double_double,
3615 BUILT_IN_FMOD, NULL_PTR);
3616 builtin_function ("__builtin_frem", double_ftype_double_double,
3617 BUILT_IN_FREM, NULL_PTR);
3618 builtin_function ("__builtin_getexp", double_ftype_double, BUILT_IN_GETEXP,
3620 builtin_function ("__builtin_getman", double_ftype_double, BUILT_IN_GETMAN,
3624 pedantic_lvalues = pedantic;
3626 /* Create the global bindings for __FUNCTION__ and __PRETTY_FUNCTION__. */
3627 declare_function_name ();
3629 start_identifier_warnings ();
3631 /* Prepare to check format strings against argument lists. */
3632 init_function_format_info ();
3636 incomplete_decl_finalize_hook = finish_incomplete_decl;
3638 lang_get_alias_set = c_get_alias_set;
3641 /* Return a definition for a builtin function named NAME and whose data type
3642 is TYPE. TYPE should be a function type with argument types.
3643 FUNCTION_CODE tells later passes how to compile calls to this function.
3644 See tree.h for its possible values.
3646 If LIBRARY_NAME is nonzero, use that for DECL_ASSEMBLER_NAME,
3647 the name to be called if we can't opencode the function. */
3650 builtin_function (name, type, function_code, library_name)
3653 enum built_in_function function_code;
3654 const char *library_name;
3656 tree decl = build_decl (FUNCTION_DECL, get_identifier (name), type);
3657 DECL_EXTERNAL (decl) = 1;
3658 TREE_PUBLIC (decl) = 1;
3659 /* If -traditional, permit redefining a builtin function any way you like.
3660 (Though really, if the program redefines these functions,
3661 it probably won't work right unless compiled with -fno-builtin.) */
3662 if (flag_traditional && name[0] != '_')
3663 DECL_BUILT_IN_NONANSI (decl) = 1;
3665 DECL_ASSEMBLER_NAME (decl) = get_identifier (library_name);
3666 make_decl_rtl (decl, NULL_PTR, 1);
3668 if (function_code != NOT_BUILT_IN)
3670 DECL_BUILT_IN (decl) = 1;
3671 DECL_FUNCTION_CODE (decl) = function_code;
3673 /* Warn if a function in the namespace for users
3674 is used without an occasion to consider it declared. */
3675 if (name[0] != '_' || name[1] != '_')
3676 C_DECL_ANTICIPATED (decl) = 1;
3681 /* Called when a declaration is seen that contains no names to declare.
3682 If its type is a reference to a structure, union or enum inherited
3683 from a containing scope, shadow that tag name for the current scope
3684 with a forward reference.
3685 If its type defines a new named structure or union
3686 or defines an enum, it is valid but we need not do anything here.
3687 Otherwise, it is an error. */
3690 shadow_tag (declspecs)
3693 shadow_tag_warned (declspecs, 0);
3697 shadow_tag_warned (declspecs, warned)
3700 /* 1 => we have done a pedwarn. 2 => we have done a warning, but
3707 pending_invalid_xref = 0;
3709 /* Remove the attributes from declspecs, since they will confuse the
3711 split_specs_attrs (declspecs, &specs, &attrs);
3713 for (link = specs; link; link = TREE_CHAIN (link))
3715 register tree value = TREE_VALUE (link);
3716 register enum tree_code code = TREE_CODE (value);
3718 if (code == RECORD_TYPE || code == UNION_TYPE || code == ENUMERAL_TYPE)
3719 /* Used to test also that TYPE_SIZE (value) != 0.
3720 That caused warning for `struct foo;' at top level in the file. */
3722 register tree name = lookup_tag_reverse (value);
3729 if (warned != 1 && code != ENUMERAL_TYPE)
3730 /* Empty unnamed enum OK */
3732 pedwarn ("unnamed struct/union that defines no instances");
3738 t = lookup_tag (code, name, current_binding_level, 1);
3742 t = make_node (code);
3749 if (!warned && ! in_system_header)
3751 warning ("useless keyword or type name in empty declaration");
3758 error ("two types specified in one empty declaration");
3763 pedwarn ("empty declaration");
3767 /* Decode a "typename", such as "int **", returning a ..._TYPE node. */
3770 groktypename (typename)
3773 if (TREE_CODE (typename) != TREE_LIST)
3775 return grokdeclarator (TREE_VALUE (typename),
3776 TREE_PURPOSE (typename),
3780 /* Return a PARM_DECL node for a given pair of specs and declarator. */
3783 groktypename_in_parm_context (typename)
3786 if (TREE_CODE (typename) != TREE_LIST)
3788 return grokdeclarator (TREE_VALUE (typename),
3789 TREE_PURPOSE (typename),
3793 /* Decode a declarator in an ordinary declaration or data definition.
3794 This is called as soon as the type information and variable name
3795 have been parsed, before parsing the initializer if any.
3796 Here we create the ..._DECL node, fill in its type,
3797 and put it on the list of decls for the current context.
3798 The ..._DECL node is returned as the value.
3800 Exception: for arrays where the length is not specified,
3801 the type is left null, to be filled in by `finish_decl'.
3803 Function definitions do not come here; they go to start_function
3804 instead. However, external and forward declarations of functions
3805 do go through here. Structure field declarations are done by
3806 grokfield and not through here. */
3808 /* Set this to zero to debug not using the temporary obstack
3809 to parse initializers. */
3810 int debug_temp_inits = 1;
3813 start_decl (declarator, declspecs, initialized, attributes, prefix_attributes)
3814 tree declarator, declspecs;
3816 tree attributes, prefix_attributes;
3818 register tree decl = grokdeclarator (declarator, declspecs,
3819 NORMAL, initialized);
3821 int init_written = initialized;
3823 /* The corresponding pop_obstacks is in finish_decl. */
3824 push_obstacks_nochange ();
3826 if (warn_main > 0 && TREE_CODE (decl) != FUNCTION_DECL
3827 && !strcmp (IDENTIFIER_POINTER (DECL_NAME (decl)), "main"))
3828 warning_with_decl (decl, "`%s' is usually a function");
3831 /* Is it valid for this decl to have an initializer at all?
3832 If not, set INITIALIZED to zero, which will indirectly
3833 tell `finish_decl' to ignore the initializer once it is parsed. */
3834 switch (TREE_CODE (decl))
3837 /* typedef foo = bar means give foo the same type as bar.
3838 We haven't parsed bar yet, so `finish_decl' will fix that up.
3839 Any other case of an initialization in a TYPE_DECL is an error. */
3840 if (pedantic || list_length (declspecs) > 1)
3842 error ("typedef `%s' is initialized",
3843 IDENTIFIER_POINTER (DECL_NAME (decl)));
3849 error ("function `%s' is initialized like a variable",
3850 IDENTIFIER_POINTER (DECL_NAME (decl)));
3855 /* DECL_INITIAL in a PARM_DECL is really DECL_ARG_TYPE. */
3856 error ("parameter `%s' is initialized",
3857 IDENTIFIER_POINTER (DECL_NAME (decl)));
3862 /* Don't allow initializations for incomplete types
3863 except for arrays which might be completed by the initialization. */
3864 if (TYPE_SIZE (TREE_TYPE (decl)) != 0)
3866 /* A complete type is ok if size is fixed. */
3868 if (TREE_CODE (TYPE_SIZE (TREE_TYPE (decl))) != INTEGER_CST
3869 || C_DECL_VARIABLE_SIZE (decl))
3871 error ("variable-sized object may not be initialized");
3875 else if (TREE_CODE (TREE_TYPE (decl)) != ARRAY_TYPE)
3877 error ("variable `%s' has initializer but incomplete type",
3878 IDENTIFIER_POINTER (DECL_NAME (decl)));
3881 else if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl))) == 0)
3883 error ("elements of array `%s' have incomplete type",
3884 IDENTIFIER_POINTER (DECL_NAME (decl)));
3891 #if 0 /* Seems redundant with grokdeclarator. */
3892 if (current_binding_level != global_binding_level
3893 && DECL_EXTERNAL (decl)
3894 && TREE_CODE (decl) != FUNCTION_DECL)
3895 warning ("declaration of `%s' has `extern' and is initialized",
3896 IDENTIFIER_POINTER (DECL_NAME (decl)));
3898 DECL_EXTERNAL (decl) = 0;
3899 if (current_binding_level == global_binding_level)
3900 TREE_STATIC (decl) = 1;
3902 /* Tell `pushdecl' this is an initialized decl
3903 even though we don't yet have the initializer expression.
3904 Also tell `finish_decl' it may store the real initializer. */
3905 DECL_INITIAL (decl) = error_mark_node;
3908 /* If this is a function declaration, write a record describing it to the
3909 prototypes file (if requested). */
3911 if (TREE_CODE (decl) == FUNCTION_DECL)
3912 gen_aux_info_record (decl, 0, 0, TYPE_ARG_TYPES (TREE_TYPE (decl)) != 0);
3914 /* ANSI specifies that a tentative definition which is not merged with
3915 a non-tentative definition behaves exactly like a definition with an
3916 initializer equal to zero. (Section 3.7.2)
3917 -fno-common gives strict ANSI behavior. Usually you don't want it.
3918 This matters only for variables with external linkage. */
3919 if (! flag_no_common || ! TREE_PUBLIC (decl))
3920 DECL_COMMON (decl) = 1;
3922 #ifdef SET_DEFAULT_DECL_ATTRIBUTES
3923 SET_DEFAULT_DECL_ATTRIBUTES (decl, attributes);
3926 /* Set attributes here so if duplicate decl, will have proper attributes. */
3927 decl_attributes (decl, attributes, prefix_attributes);
3929 /* Add this decl to the current binding level.
3930 TEM may equal DECL or it may be a previous decl of the same name. */
3931 tem = pushdecl (decl);
3933 /* For a local variable, define the RTL now. */
3934 if (current_binding_level != global_binding_level
3935 /* But not if this is a duplicate decl
3936 and we preserved the rtl from the previous one
3937 (which may or may not happen). */
3938 && DECL_RTL (tem) == 0)
3940 if (TYPE_SIZE (TREE_TYPE (tem)) != 0)
3942 else if (TREE_CODE (TREE_TYPE (tem)) == ARRAY_TYPE
3943 && DECL_INITIAL (tem) != 0)
3949 /* When parsing and digesting the initializer,
3950 use temporary storage. Do this even if we will ignore the value. */
3951 if (current_binding_level == global_binding_level && debug_temp_inits)
3952 temporary_allocation ();
3958 /* Finish processing of a declaration;
3959 install its initial value.
3960 If the length of an array type is not known before,
3961 it must be determined now, from the initial value, or it is an error. */
3964 finish_decl (decl, init, asmspec_tree)
3968 register tree type = TREE_TYPE (decl);
3969 int was_incomplete = (DECL_SIZE (decl) == 0);
3970 int temporary = allocation_temporary_p ();
3973 /* If a name was specified, get the string. */
3975 asmspec = TREE_STRING_POINTER (asmspec_tree);
3977 /* If `start_decl' didn't like having an initialization, ignore it now. */
3979 if (init != 0 && DECL_INITIAL (decl) == 0)
3981 /* Don't crash if parm is initialized. */
3982 if (TREE_CODE (decl) == PARM_DECL)
3985 if (ITERATOR_P (decl))
3988 error_with_decl (decl, "iterator has no initial value");
3990 init = save_expr (init);
3995 if (TREE_CODE (decl) != TYPE_DECL)
3996 store_init_value (decl, init);
3999 /* typedef foo = bar; store the type of bar as the type of foo. */
4000 TREE_TYPE (decl) = TREE_TYPE (init);
4001 DECL_INITIAL (decl) = init = 0;
4005 /* Pop back to the obstack that is current for this binding level.
4006 This is because MAXINDEX, rtl, etc. to be made below
4007 must go in the permanent obstack. But don't discard the
4008 temporary data yet. */
4010 #if 0 /* pop_obstacks was near the end; this is what was here. */
4011 if (current_binding_level == global_binding_level && temporary)
4012 end_temporary_allocation ();
4015 /* Deduce size of array from initialization, if not already known */
4017 if (TREE_CODE (type) == ARRAY_TYPE
4018 && TYPE_DOMAIN (type) == 0
4019 && TREE_CODE (decl) != TYPE_DECL)
4022 = (TREE_STATIC (decl)
4023 /* Even if pedantic, an external linkage array
4024 may have incomplete type at first. */
4025 ? pedantic && !TREE_PUBLIC (decl)
4026 : !DECL_EXTERNAL (decl));
4028 = complete_array_type (type, DECL_INITIAL (decl), do_default);
4030 /* Get the completed type made by complete_array_type. */
4031 type = TREE_TYPE (decl);
4034 error_with_decl (decl, "initializer fails to determine size of `%s'");
4039 error_with_decl (decl, "array size missing in `%s'");
4040 /* If a `static' var's size isn't known,
4041 make it extern as well as static, so it does not get
4043 If it is not `static', then do not mark extern;
4044 finish_incomplete_decl will give it a default size
4045 and it will get allocated. */
4046 else if (!pedantic && TREE_STATIC (decl) && ! TREE_PUBLIC (decl))
4047 DECL_EXTERNAL (decl) = 1;
4050 /* TYPE_MAX_VALUE is always one less than the number of elements
4051 in the array, because we start counting at zero. Therefore,
4052 warn only if the value is less than zero. */
4053 if (pedantic && TYPE_DOMAIN (type) != 0
4054 && tree_int_cst_sgn (TYPE_MAX_VALUE (TYPE_DOMAIN (type))) < 0)
4055 error_with_decl (decl, "zero or negative size array `%s'");
4057 layout_decl (decl, 0);
4060 if (TREE_CODE (decl) == VAR_DECL)
4062 if (DECL_SIZE (decl) == 0
4063 && TYPE_SIZE (TREE_TYPE (decl)) != 0)
4064 layout_decl (decl, 0);
4066 if (DECL_SIZE (decl) == 0
4067 && (TREE_STATIC (decl)
4069 /* A static variable with an incomplete type
4070 is an error if it is initialized.
4071 Also if it is not file scope.
4072 Otherwise, let it through, but if it is not `extern'
4073 then it may cause an error message later. */
4074 /* A duplicate_decls call could have changed an extern
4075 declaration into a file scope one. This can be detected
4076 by TREE_ASM_WRITTEN being set. */
4077 (DECL_INITIAL (decl) != 0
4078 || (DECL_CONTEXT (decl) != 0 && ! TREE_ASM_WRITTEN (decl)))
4080 /* An automatic variable with an incomplete type
4082 !DECL_EXTERNAL (decl)))
4084 error_with_decl (decl, "storage size of `%s' isn't known");
4085 TREE_TYPE (decl) = error_mark_node;
4088 if ((DECL_EXTERNAL (decl) || TREE_STATIC (decl))
4089 && DECL_SIZE (decl) != 0)
4091 if (TREE_CODE (DECL_SIZE (decl)) == INTEGER_CST)
4092 constant_expression_warning (DECL_SIZE (decl));
4094 error_with_decl (decl, "storage size of `%s' isn't constant");
4097 if (TREE_USED (type))
4098 TREE_USED (decl) = 1;
4101 /* If this is a function and an assembler name is specified, it isn't
4102 builtin any more. Also reset DECL_RTL so we can give it its new
4104 if (TREE_CODE (decl) == FUNCTION_DECL && asmspec)
4106 DECL_BUILT_IN (decl) = 0;
4107 DECL_RTL (decl) = 0;
4110 /* Output the assembler code and/or RTL code for variables and functions,
4111 unless the type is an undefined structure or union.
4112 If not, it will get done when the type is completed. */
4114 if (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == FUNCTION_DECL)
4116 if ((flag_traditional || TREE_PERMANENT (decl))
4117 && allocation_temporary_p ())
4119 push_obstacks_nochange ();
4120 end_temporary_allocation ();
4121 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
4122 maybe_objc_check_decl (decl);
4123 rest_of_decl_compilation (decl, asmspec,
4124 (DECL_CONTEXT (decl) == 0
4125 || TREE_ASM_WRITTEN (decl)),
4131 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
4132 maybe_objc_check_decl (decl);
4133 rest_of_decl_compilation (decl, asmspec, DECL_CONTEXT (decl) == 0,
4136 if (DECL_CONTEXT (decl) != 0)
4138 /* Recompute the RTL of a local array now
4139 if it used to be an incomplete type. */
4141 && ! TREE_STATIC (decl) && ! DECL_EXTERNAL (decl))
4143 /* If we used it already as memory, it must stay in memory. */
4144 TREE_ADDRESSABLE (decl) = TREE_USED (decl);
4145 /* If it's still incomplete now, no init will save it. */
4146 if (DECL_SIZE (decl) == 0)
4147 DECL_INITIAL (decl) = 0;
4150 /* Compute and store the initial value. */
4151 if (TREE_CODE (decl) != FUNCTION_DECL)
4152 expand_decl_init (decl);
4156 if (TREE_CODE (decl) == TYPE_DECL)
4158 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
4159 maybe_objc_check_decl (decl);
4160 rest_of_decl_compilation (decl, NULL_PTR, DECL_CONTEXT (decl) == 0,
4164 /* ??? After 2.3, test (init != 0) instead of TREE_CODE. */
4165 /* This test used to include TREE_PERMANENT, however, we have the same
4166 problem with initializers at the function level. Such initializers get
4167 saved until the end of the function on the momentary_obstack. */
4168 if (!(TREE_CODE (decl) == FUNCTION_DECL && DECL_INLINE (decl))
4170 /* DECL_INITIAL is not defined in PARM_DECLs, since it shares
4171 space with DECL_ARG_TYPE. */
4172 && TREE_CODE (decl) != PARM_DECL)
4174 /* We need to remember that this array HAD an initialization,
4175 but discard the actual temporary nodes,
4176 since we can't have a permanent node keep pointing to them. */
4177 /* We make an exception for inline functions, since it's
4178 normal for a local extern redeclaration of an inline function
4179 to have a copy of the top-level decl's DECL_INLINE. */
4180 if (DECL_INITIAL (decl) != 0 && DECL_INITIAL (decl) != error_mark_node)
4182 /* If this is a const variable, then preserve the
4183 initializer instead of discarding it so that we can optimize
4184 references to it. */
4185 /* This test used to include TREE_STATIC, but this won't be set
4186 for function level initializers. */
4187 if (TREE_READONLY (decl) || ITERATOR_P (decl))
4189 preserve_initializer ();
4190 /* Hack? Set the permanent bit for something that is permanent,
4191 but not on the permanent obstack, so as to convince
4192 output_constant_def to make its rtl on the permanent
4194 TREE_PERMANENT (DECL_INITIAL (decl)) = 1;
4196 /* The initializer and DECL must have the same (or equivalent
4197 types), but if the initializer is a STRING_CST, its type
4198 might not be on the right obstack, so copy the type
4200 TREE_TYPE (DECL_INITIAL (decl)) = type;
4203 DECL_INITIAL (decl) = error_mark_node;
4207 /* If requested, warn about definitions of large data objects. */
4209 if (warn_larger_than
4210 && (TREE_CODE (decl) == VAR_DECL || TREE_CODE (decl) == PARM_DECL)
4211 && !DECL_EXTERNAL (decl))
4213 register tree decl_size = DECL_SIZE (decl);
4215 if (decl_size && TREE_CODE (decl_size) == INTEGER_CST)
4217 unsigned units = TREE_INT_CST_LOW(decl_size) / BITS_PER_UNIT;
4219 if (units > larger_than_size)
4220 warning_with_decl (decl, "size of `%s' is %u bytes", units);
4225 /* Resume permanent allocation, if not within a function. */
4226 /* The corresponding push_obstacks_nochange is in start_decl,
4227 and in push_parm_decl and in grokfield. */
4231 /* If we have gone back from temporary to permanent allocation,
4232 actually free the temporary space that we no longer need. */
4233 if (temporary && !allocation_temporary_p ())
4234 permanent_allocation (0);
4236 /* At the end of a declaration, throw away any variable type sizes
4237 of types defined inside that declaration. There is no use
4238 computing them in the following function definition. */
4239 if (current_binding_level == global_binding_level)
4240 get_pending_sizes ();
4243 /* If DECL has a cleanup, build and return that cleanup here.
4244 This is a callback called by expand_expr. */
4247 maybe_build_cleanup (decl)
4248 tree decl ATTRIBUTE_UNUSED;
4250 /* There are no cleanups in C. */
4254 /* Given a parsed parameter declaration,
4255 decode it into a PARM_DECL and push that on the current binding level.
4256 Also, for the sake of forward parm decls,
4257 record the given order of parms in `parm_order'. */
4260 push_parm_decl (parm)
4264 int old_immediate_size_expand = immediate_size_expand;
4265 /* Don't try computing parm sizes now -- wait till fn is called. */
4266 immediate_size_expand = 0;
4268 /* The corresponding pop_obstacks is in finish_decl. */
4269 push_obstacks_nochange ();
4271 decl = grokdeclarator (TREE_VALUE (TREE_PURPOSE (parm)),
4272 TREE_PURPOSE (TREE_PURPOSE (parm)), PARM, 0);
4273 decl_attributes (decl, TREE_VALUE (TREE_VALUE (parm)),
4274 TREE_PURPOSE (TREE_VALUE (parm)));
4277 if (DECL_NAME (decl))
4280 olddecl = lookup_name (DECL_NAME (decl));
4281 if (pedantic && olddecl != 0 && TREE_CODE (olddecl) == TYPE_DECL)
4282 pedwarn_with_decl (decl, "ANSI C forbids parameter `%s' shadowing typedef");
4286 decl = pushdecl (decl);
4288 immediate_size_expand = old_immediate_size_expand;
4290 current_binding_level->parm_order
4291 = tree_cons (NULL_TREE, decl, current_binding_level->parm_order);
4293 /* Add this decl to the current binding level. */
4294 finish_decl (decl, NULL_TREE, NULL_TREE);
4297 /* Clear the given order of parms in `parm_order'.
4298 Used at start of parm list,
4299 and also at semicolon terminating forward decls. */
4304 current_binding_level->parm_order = NULL_TREE;
4307 /* Make TYPE a complete type based on INITIAL_VALUE.
4308 Return 0 if successful, 1 if INITIAL_VALUE can't be deciphered,
4309 2 if there was no information (in which case assume 1 if DO_DEFAULT). */
4312 complete_array_type (type, initial_value, do_default)
4317 register tree maxindex = NULL_TREE;
4322 /* Note MAXINDEX is really the maximum index,
4323 one less than the size. */
4324 if (TREE_CODE (initial_value) == STRING_CST)
4327 = int_size_in_bytes (TREE_TYPE (TREE_TYPE (initial_value)));
4328 maxindex = build_int_2 ((TREE_STRING_LENGTH (initial_value)
4331 else if (TREE_CODE (initial_value) == CONSTRUCTOR)
4333 tree elts = CONSTRUCTOR_ELTS (initial_value);
4334 maxindex = size_binop (MINUS_EXPR, integer_zero_node, size_one_node);
4335 for (; elts; elts = TREE_CHAIN (elts))
4337 if (TREE_PURPOSE (elts))
4338 maxindex = TREE_PURPOSE (elts);
4340 maxindex = size_binop (PLUS_EXPR, maxindex, size_one_node);
4342 maxindex = copy_node (maxindex);
4346 /* Make an error message unless that happened already. */
4347 if (initial_value != error_mark_node)
4350 /* Prevent further error messages. */
4351 maxindex = build_int_2 (0, 0);
4358 maxindex = build_int_2 (0, 0);
4364 TYPE_DOMAIN (type) = build_index_type (maxindex);
4365 if (!TREE_TYPE (maxindex))
4366 TREE_TYPE (maxindex) = TYPE_DOMAIN (type);
4369 /* Lay out the type now that we can get the real answer. */
4376 /* Given declspecs and a declarator,
4377 determine the name and type of the object declared
4378 and construct a ..._DECL node for it.
4379 (In one case we can return a ..._TYPE node instead.
4380 For invalid input we sometimes return 0.)
4382 DECLSPECS is a chain of tree_list nodes whose value fields
4383 are the storage classes and type specifiers.
4385 DECL_CONTEXT says which syntactic context this declaration is in:
4386 NORMAL for most contexts. Make a VAR_DECL or FUNCTION_DECL or TYPE_DECL.
4387 FUNCDEF for a function definition. Like NORMAL but a few different
4388 error messages in each case. Return value may be zero meaning
4389 this definition is too screwy to try to parse.
4390 PARM for a parameter declaration (either within a function prototype
4391 or before a function body). Make a PARM_DECL, or return void_type_node.
4392 TYPENAME if for a typename (in a cast or sizeof).
4393 Don't make a DECL node; just return the ..._TYPE node.
4394 FIELD for a struct or union field; make a FIELD_DECL.
4395 BITFIELD for a field with specified width.
4396 INITIALIZED is 1 if the decl has an initializer.
4398 In the TYPENAME case, DECLARATOR is really an absolute declarator.
4399 It may also be so in the PARM case, for a prototype where the
4400 argument type is specified but not the name.
4402 This function is where the complicated C meanings of `static'
4403 and `extern' are interpreted. */
4406 grokdeclarator (declarator, declspecs, decl_context, initialized)
4409 enum decl_context decl_context;
4414 tree type = NULL_TREE;
4419 int type_quals = TYPE_UNQUALIFIED;
4421 int explicit_int = 0;
4422 int explicit_char = 0;
4423 int defaulted_int = 0;
4424 tree typedef_decl = 0;
4426 tree typedef_type = 0;
4427 int funcdef_flag = 0;
4428 enum tree_code innermost_code = ERROR_MARK;
4430 int size_varies = 0;
4431 tree decl_machine_attr = NULL_TREE;
4433 if (decl_context == BITFIELD)
4434 bitfield = 1, decl_context = FIELD;
4436 if (decl_context == FUNCDEF)
4437 funcdef_flag = 1, decl_context = NORMAL;
4439 push_obstacks_nochange ();
4441 if (flag_traditional && allocation_temporary_p ())
4442 end_temporary_allocation ();
4444 /* Look inside a declarator for the name being declared
4445 and get it as a string, for an error message. */
4447 register tree decl = declarator;
4451 switch (TREE_CODE (decl))
4456 innermost_code = TREE_CODE (decl);
4457 decl = TREE_OPERAND (decl, 0);
4460 case IDENTIFIER_NODE:
4461 name = IDENTIFIER_POINTER (decl);
4472 /* A function definition's declarator must have the form of
4473 a function declarator. */
4475 if (funcdef_flag && innermost_code != CALL_EXPR)
4478 /* Anything declared one level down from the top level
4479 must be one of the parameters of a function
4480 (because the body is at least two levels down). */
4482 /* If this looks like a function definition, make it one,
4483 even if it occurs where parms are expected.
4484 Then store_parm_decls will reject it and not use it as a parm. */
4485 if (decl_context == NORMAL && !funcdef_flag
4486 && current_binding_level->parm_flag)
4487 decl_context = PARM;
4489 /* Look through the decl specs and record which ones appear.
4490 Some typespecs are defined as built-in typenames.
4491 Others, the ones that are modifiers of other types,
4492 are represented by bits in SPECBITS: set the bits for
4493 the modifiers that appear. Storage class keywords are also in SPECBITS.
4495 If there is a typedef name or a type, store the type in TYPE.
4496 This includes builtin typedefs such as `int'.
4498 Set EXPLICIT_INT or EXPLICIT_CHAR if the type is `int' or `char'
4499 and did not come from a user typedef.
4501 Set LONGLONG if `long' is mentioned twice. */
4503 for (spec = declspecs; spec; spec = TREE_CHAIN (spec))
4506 register tree id = TREE_VALUE (spec);
4508 if (id == ridpointers[(int) RID_INT])
4510 if (id == ridpointers[(int) RID_CHAR])
4513 if (TREE_CODE (id) == IDENTIFIER_NODE)
4514 for (i = (int) RID_FIRST_MODIFIER; i < (int) RID_MAX; i++)
4516 if (ridpointers[i] == id)
4518 if (i == (int) RID_LONG && specbits & (1<<i))
4521 error ("`long long long' is too long for GCC");
4524 if (pedantic && ! in_system_header && warn_long_long)
4525 pedwarn ("ANSI C does not support `long long'");
4529 else if (specbits & (1 << i))
4530 pedwarn ("duplicate `%s'", IDENTIFIER_POINTER (id));
4536 error ("two or more data types in declaration of `%s'", name);
4537 /* Actual typedefs come to us as TYPE_DECL nodes. */
4538 else if (TREE_CODE (id) == TYPE_DECL)
4540 type = TREE_TYPE (id);
4541 decl_machine_attr = DECL_MACHINE_ATTRIBUTES (id);
4544 /* Built-in types come as identifiers. */
4545 else if (TREE_CODE (id) == IDENTIFIER_NODE)
4547 register tree t = lookup_name (id);
4548 if (TREE_TYPE (t) == error_mark_node)
4550 else if (!t || TREE_CODE (t) != TYPE_DECL)
4551 error ("`%s' fails to be a typedef or built in type",
4552 IDENTIFIER_POINTER (id));
4555 type = TREE_TYPE (t);
4559 else if (TREE_CODE (id) != ERROR_MARK)
4565 typedef_type = type;
4567 size_varies = C_TYPE_VARIABLE_SIZE (type);
4569 /* No type at all: default to `int', and set DEFAULTED_INT
4570 because it was not a user-defined typedef. */
4574 if ((! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4575 | (1 << (int) RID_SIGNED)
4576 | (1 << (int) RID_UNSIGNED))))
4577 /* Don't warn about typedef foo = bar. */
4578 && ! (specbits & (1 << (int) RID_TYPEDEF) && initialized)
4579 && ! (in_system_header && ! allocation_temporary_p ()))
4581 /* Issue a warning if this is an ISO C 9x program or if -Wreturn-type
4582 and this is a function, or if -Wimplicit; prefer the former
4583 warning since it is more explicit. */
4584 if ((warn_implicit_int || warn_return_type) && funcdef_flag)
4585 warn_about_return_type = 1;
4586 else if (warn_implicit_int || flag_isoc9x)
4587 warning ("type defaults to `int' in declaration of `%s'", name);
4591 type = integer_type_node;
4594 /* Now process the modifiers that were specified
4595 and check for invalid combinations. */
4597 /* Long double is a special combination. */
4599 if ((specbits & 1 << (int) RID_LONG) && ! longlong
4600 && TYPE_MAIN_VARIANT (type) == double_type_node)
4602 specbits &= ~ (1 << (int) RID_LONG);
4603 type = long_double_type_node;
4606 /* Check all other uses of type modifiers. */
4608 if (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4609 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED)))
4613 if ((specbits & 1 << (int) RID_LONG)
4614 && (specbits & 1 << (int) RID_SHORT))
4615 error ("both long and short specified for `%s'", name);
4616 else if (((specbits & 1 << (int) RID_LONG)
4617 || (specbits & 1 << (int) RID_SHORT))
4619 error ("long or short specified with char for `%s'", name);
4620 else if (((specbits & 1 << (int) RID_LONG)
4621 || (specbits & 1 << (int) RID_SHORT))
4622 && TREE_CODE (type) == REAL_TYPE)
4624 static int already = 0;
4626 error ("long or short specified with floating type for `%s'", name);
4627 if (! already && ! pedantic)
4629 error ("the only valid combination is `long double'");
4633 else if ((specbits & 1 << (int) RID_SIGNED)
4634 && (specbits & 1 << (int) RID_UNSIGNED))
4635 error ("both signed and unsigned specified for `%s'", name);
4636 else if (TREE_CODE (type) != INTEGER_TYPE)
4637 error ("long, short, signed or unsigned invalid for `%s'", name);
4641 if (!explicit_int && !defaulted_int && !explicit_char && pedantic)
4643 pedwarn ("long, short, signed or unsigned used invalidly for `%s'",
4645 if (flag_pedantic_errors)
4650 /* Discard the type modifiers if they are invalid. */
4653 specbits &= ~((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4654 | (1 << (int) RID_UNSIGNED) | (1 << (int) RID_SIGNED));
4659 if ((specbits & (1 << (int) RID_COMPLEX))
4660 && TREE_CODE (type) != INTEGER_TYPE && TREE_CODE (type) != REAL_TYPE)
4662 error ("complex invalid for `%s'", name);
4663 specbits &= ~ (1 << (int) RID_COMPLEX);
4666 /* Decide whether an integer type is signed or not.
4667 Optionally treat bitfields as signed by default. */
4668 if (specbits & 1 << (int) RID_UNSIGNED
4669 /* Traditionally, all bitfields are unsigned. */
4670 || (bitfield && flag_traditional
4671 && (! explicit_flag_signed_bitfields || !flag_signed_bitfields))
4672 || (bitfield && ! flag_signed_bitfields
4673 && (explicit_int || defaulted_int || explicit_char
4674 /* A typedef for plain `int' without `signed'
4675 can be controlled just like plain `int'. */
4676 || ! (typedef_decl != 0
4677 && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
4678 && TREE_CODE (type) != ENUMERAL_TYPE
4679 && !(specbits & 1 << (int) RID_SIGNED)))
4682 type = long_long_unsigned_type_node;
4683 else if (specbits & 1 << (int) RID_LONG)
4684 type = long_unsigned_type_node;
4685 else if (specbits & 1 << (int) RID_SHORT)
4686 type = short_unsigned_type_node;
4687 else if (type == char_type_node)
4688 type = unsigned_char_type_node;
4689 else if (typedef_decl)
4690 type = unsigned_type (type);
4692 type = unsigned_type_node;
4694 else if ((specbits & 1 << (int) RID_SIGNED)
4695 && type == char_type_node)
4696 type = signed_char_type_node;
4698 type = long_long_integer_type_node;
4699 else if (specbits & 1 << (int) RID_LONG)
4700 type = long_integer_type_node;
4701 else if (specbits & 1 << (int) RID_SHORT)
4702 type = short_integer_type_node;
4704 if (specbits & 1 << (int) RID_COMPLEX)
4706 /* If we just have "complex", it is equivalent to
4707 "complex double", but if any modifiers at all are specified it is
4708 the complex form of TYPE. E.g, "complex short" is
4709 "complex short int". */
4711 if (defaulted_int && ! longlong
4712 && ! (specbits & ((1 << (int) RID_LONG) | (1 << (int) RID_SHORT)
4713 | (1 << (int) RID_SIGNED)
4714 | (1 << (int) RID_UNSIGNED))))
4715 type = complex_double_type_node;
4716 else if (type == integer_type_node)
4717 type = complex_integer_type_node;
4718 else if (type == float_type_node)
4719 type = complex_float_type_node;
4720 else if (type == double_type_node)
4721 type = complex_double_type_node;
4722 else if (type == long_double_type_node)
4723 type = complex_long_double_type_node;
4725 type = build_complex_type (type);
4728 /* Figure out the type qualifiers for the declaration. There are
4729 two ways a declaration can become qualified. One is something
4730 like `const int i' where the `const' is explicit. Another is
4731 something like `typedef const int CI; CI i' where the type of the
4732 declaration contains the `const'. */
4733 constp = !! (specbits & 1 << (int) RID_CONST) + TYPE_READONLY (type);
4734 restrictp = !! (specbits & 1 << (int) RID_RESTRICT) + TYPE_RESTRICT (type);
4735 volatilep = !! (specbits & 1 << (int) RID_VOLATILE) + TYPE_VOLATILE (type);
4736 inlinep = !! (specbits & (1 << (int) RID_INLINE));
4738 pedwarn ("duplicate `const'");
4740 pedwarn ("duplicate `restrict'");
4742 pedwarn ("duplicate `volatile'");
4743 if (! flag_gen_aux_info && (TYPE_QUALS (type)))
4744 type = TYPE_MAIN_VARIANT (type);
4745 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
4746 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
4747 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
4749 /* Warn if two storage classes are given. Default to `auto'. */
4754 if (specbits & 1 << (int) RID_AUTO) nclasses++;
4755 if (specbits & 1 << (int) RID_STATIC) nclasses++;
4756 if (specbits & 1 << (int) RID_EXTERN) nclasses++;
4757 if (specbits & 1 << (int) RID_REGISTER) nclasses++;
4758 if (specbits & 1 << (int) RID_TYPEDEF) nclasses++;
4759 if (specbits & 1 << (int) RID_ITERATOR) nclasses++;
4761 /* Warn about storage classes that are invalid for certain
4762 kinds of declarations (parameters, typenames, etc.). */
4765 error ("multiple storage classes in declaration of `%s'", name);
4766 else if (funcdef_flag
4768 & ((1 << (int) RID_REGISTER)
4769 | (1 << (int) RID_AUTO)
4770 | (1 << (int) RID_TYPEDEF))))
4772 if (specbits & 1 << (int) RID_AUTO
4773 && (pedantic || current_binding_level == global_binding_level))
4774 pedwarn ("function definition declared `auto'");
4775 if (specbits & 1 << (int) RID_REGISTER)
4776 error ("function definition declared `register'");
4777 if (specbits & 1 << (int) RID_TYPEDEF)
4778 error ("function definition declared `typedef'");
4779 specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4780 | (1 << (int) RID_AUTO));
4782 else if (decl_context != NORMAL && nclasses > 0)
4784 if (decl_context == PARM && specbits & 1 << (int) RID_REGISTER)
4788 error ((decl_context == FIELD
4789 ? "storage class specified for structure field `%s'"
4790 : (decl_context == PARM
4791 ? "storage class specified for parameter `%s'"
4792 : "storage class specified for typename")),
4794 specbits &= ~ ((1 << (int) RID_TYPEDEF) | (1 << (int) RID_REGISTER)
4795 | (1 << (int) RID_AUTO) | (1 << (int) RID_STATIC)
4796 | (1 << (int) RID_EXTERN));
4799 else if (specbits & 1 << (int) RID_EXTERN && initialized && ! funcdef_flag)
4801 /* `extern' with initialization is invalid if not at top level. */
4802 if (current_binding_level == global_binding_level)
4803 warning ("`%s' initialized and declared `extern'", name);
4805 error ("`%s' has both `extern' and initializer", name);
4807 else if (specbits & 1 << (int) RID_EXTERN && funcdef_flag
4808 && current_binding_level != global_binding_level)
4809 error ("nested function `%s' declared `extern'", name);
4810 else if (current_binding_level == global_binding_level
4811 && specbits & (1 << (int) RID_AUTO))
4812 error ("top-level declaration of `%s' specifies `auto'", name);
4813 else if ((specbits & 1 << (int) RID_ITERATOR)
4814 && TREE_CODE (declarator) != IDENTIFIER_NODE)
4816 error ("iterator `%s' has derived type", name);
4817 type = error_mark_node;
4819 else if ((specbits & 1 << (int) RID_ITERATOR)
4820 && TREE_CODE (type) != INTEGER_TYPE)
4822 error ("iterator `%s' has noninteger type", name);
4823 type = error_mark_node;
4827 /* Now figure out the structure of the declarator proper.
4828 Descend through it, creating more complex types, until we reach
4829 the declared identifier (or NULL_TREE, in an absolute declarator). */
4831 while (declarator && TREE_CODE (declarator) != IDENTIFIER_NODE)
4833 if (type == error_mark_node)
4835 declarator = TREE_OPERAND (declarator, 0);
4839 /* Each level of DECLARATOR is either an ARRAY_REF (for ...[..]),
4840 an INDIRECT_REF (for *...),
4841 a CALL_EXPR (for ...(...)),
4842 an identifier (for the name being declared)
4843 or a null pointer (for the place in an absolute declarator
4844 where the name was omitted).
4845 For the last two cases, we have just exited the loop.
4847 At this point, TYPE is the type of elements of an array,
4848 or for a function to return, or for a pointer to point to.
4849 After this sequence of ifs, TYPE is the type of the
4850 array or function or pointer, and DECLARATOR has had its
4851 outermost layer removed. */
4853 if (TREE_CODE (declarator) == ARRAY_REF)
4855 register tree itype = NULL_TREE;
4856 register tree size = TREE_OPERAND (declarator, 1);
4857 /* An uninitialized decl with `extern' is a reference. */
4858 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
4859 /* The index is a signed object `sizetype' bits wide. */
4860 tree index_type = signed_type (sizetype);
4862 declarator = TREE_OPERAND (declarator, 0);
4864 /* Check for some types that there cannot be arrays of. */
4866 if (TYPE_MAIN_VARIANT (type) == void_type_node)
4868 error ("declaration of `%s' as array of voids", name);
4869 type = error_mark_node;
4872 if (TREE_CODE (type) == FUNCTION_TYPE)
4874 error ("declaration of `%s' as array of functions", name);
4875 type = error_mark_node;
4878 if (size == error_mark_node)
4879 type = error_mark_node;
4881 if (type == error_mark_node)
4884 /* If this is a block level extern, it must live past the end
4885 of the function so that we can check it against other extern
4886 declarations (IDENTIFIER_LIMBO_VALUE). */
4887 if (extern_ref && allocation_temporary_p ())
4888 end_temporary_allocation ();
4890 /* If size was specified, set ITYPE to a range-type for that size.
4891 Otherwise, ITYPE remains null. finish_decl may figure it out
4892 from an initial value. */
4896 /* Strip NON_LVALUE_EXPRs since we aren't using as an lvalue. */
4897 STRIP_TYPE_NOPS (size);
4899 if (TREE_CODE (TREE_TYPE (size)) != INTEGER_TYPE
4900 && TREE_CODE (TREE_TYPE (size)) != ENUMERAL_TYPE)
4902 error ("size of array `%s' has non-integer type", name);
4903 size = integer_one_node;
4906 if (pedantic && integer_zerop (size))
4907 pedwarn ("ANSI C forbids zero-size array `%s'", name);
4909 if (TREE_CODE (size) == INTEGER_CST)
4911 constant_expression_warning (size);
4912 if (tree_int_cst_sgn (size) < 0)
4914 error ("size of array `%s' is negative", name);
4915 size = integer_one_node;
4920 /* Make sure the array size remains visibly nonconstant
4921 even if it is (eg) a const variable with known value. */
4926 if (TREE_CONSTANT (size))
4927 pedwarn ("ANSI C forbids array `%s' whose size can't be evaluated", name);
4929 pedwarn ("ANSI C forbids variable-size array `%s'", name);
4933 /* Convert size to index_type, so that if it is a variable
4934 the computations will be done in the proper mode. */
4935 itype = fold (build (MINUS_EXPR, index_type,
4936 convert (index_type, size),
4937 convert (index_type, size_one_node)));
4939 /* If that overflowed, the array is too big.
4940 ??? While a size of INT_MAX+1 technically shouldn't cause
4941 an overflow (because we subtract 1), the overflow is recorded
4942 during the conversion to index_type, before the subtraction.
4943 Handling this case seems like an unnecessary complication. */
4944 if (TREE_OVERFLOW (itype))
4946 error ("size of array `%s' is too large", name);
4947 type = error_mark_node;
4952 itype = variable_size (itype);
4953 itype = build_index_type (itype);
4956 #if 0 /* This had bad results for pointers to arrays, as in
4957 union incomplete (*foo)[4]; */
4958 /* Complain about arrays of incomplete types, except in typedefs. */
4960 if (TYPE_SIZE (type) == 0
4961 /* Avoid multiple warnings for nested array types. */
4962 && TREE_CODE (type) != ARRAY_TYPE
4963 && !(specbits & (1 << (int) RID_TYPEDEF))
4964 && !C_TYPE_BEING_DEFINED (type))
4965 warning ("array type has incomplete element type");
4968 #if 0 /* We shouldn't have a function type here at all!
4969 Functions aren't allowed as array elements. */
4970 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
4971 && (constp || volatilep))
4972 pedwarn ("ANSI C forbids const or volatile function types");
4975 /* Build the array type itself, then merge any constancy or
4976 volatility into the target type. We must do it in this order
4977 to ensure that the TYPE_MAIN_VARIANT field of the array type
4978 is set correctly. */
4980 type = build_array_type (type, itype);
4982 type = c_build_qualified_type (type, type_quals);
4984 #if 0 /* don't clear these; leave them set so that the array type
4985 or the variable is itself const or volatile. */
4986 type_quals = TYPE_UNQUALIFIED;
4990 C_TYPE_VARIABLE_SIZE (type) = 1;
4992 else if (TREE_CODE (declarator) == CALL_EXPR)
4994 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
4995 || current_binding_level == global_binding_level);
4998 /* Declaring a function type.
4999 Make sure we have a valid type for the function to return. */
5000 if (type == error_mark_node)
5005 /* Warn about some types functions can't return. */
5007 if (TREE_CODE (type) == FUNCTION_TYPE)
5009 error ("`%s' declared as function returning a function", name);
5010 type = integer_type_node;
5012 if (TREE_CODE (type) == ARRAY_TYPE)
5014 error ("`%s' declared as function returning an array", name);
5015 type = integer_type_node;
5018 #ifndef TRADITIONAL_RETURN_FLOAT
5019 /* Traditionally, declaring return type float means double. */
5021 if (flag_traditional && TYPE_MAIN_VARIANT (type) == float_type_node)
5022 type = double_type_node;
5023 #endif /* TRADITIONAL_RETURN_FLOAT */
5025 /* If this is a block level extern, it must live past the end
5026 of the function so that we can check it against other extern
5027 declarations (IDENTIFIER_LIMBO_VALUE). */
5028 if (extern_ref && allocation_temporary_p ())
5029 end_temporary_allocation ();
5031 /* Construct the function type and go to the next
5032 inner layer of declarator. */
5034 arg_types = grokparms (TREE_OPERAND (declarator, 1),
5036 /* Say it's a definition
5037 only for the CALL_EXPR
5038 closest to the identifier. */
5039 && TREE_CODE (TREE_OPERAND (declarator, 0)) == IDENTIFIER_NODE);
5040 #if 0 /* This seems to be false. We turn off temporary allocation
5041 above in this function if -traditional.
5042 And this code caused inconsistent results with prototypes:
5043 callers would ignore them, and pass arguments wrong. */
5045 /* Omit the arg types if -traditional, since the arg types
5046 and the list links might not be permanent. */
5047 type = build_function_type (type,
5049 ? NULL_TREE : arg_types);
5051 /* Type qualifiers before the return type of the function
5052 qualify the return type, not the function type. */
5054 type = c_build_qualified_type (type, type_quals);
5055 type_quals = TYPE_UNQUALIFIED;
5057 type = build_function_type (type, arg_types);
5058 declarator = TREE_OPERAND (declarator, 0);
5060 /* Set the TYPE_CONTEXTs for each tagged type which is local to
5061 the formal parameter list of this FUNCTION_TYPE to point to
5062 the FUNCTION_TYPE node itself. */
5067 for (link = last_function_parm_tags;
5069 link = TREE_CHAIN (link))
5070 TYPE_CONTEXT (TREE_VALUE (link)) = type;
5073 else if (TREE_CODE (declarator) == INDIRECT_REF)
5075 /* Merge any constancy or volatility into the target type
5078 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
5080 pedwarn ("ANSI C forbids qualified function types");
5082 type = c_build_qualified_type (type, type_quals);
5083 type_quals = TYPE_UNQUALIFIED;
5086 type = build_pointer_type (type);
5088 /* Process a list of type modifier keywords
5089 (such as const or volatile) that were given inside the `*'. */
5091 if (TREE_TYPE (declarator))
5093 register tree typemodlist;
5099 for (typemodlist = TREE_TYPE (declarator); typemodlist;
5100 typemodlist = TREE_CHAIN (typemodlist))
5102 tree qualifier = TREE_VALUE (typemodlist);
5104 if (qualifier == ridpointers[(int) RID_CONST])
5106 else if (qualifier == ridpointers[(int) RID_VOLATILE])
5108 else if (qualifier == ridpointers[(int) RID_RESTRICT])
5113 error ("invalid type modifier within pointer declarator");
5117 pedwarn ("duplicate `const'");
5119 pedwarn ("duplicate `volatile'");
5121 pedwarn ("duplicate `restrict'");
5123 type_quals = ((constp ? TYPE_QUAL_CONST : 0)
5124 | (restrictp ? TYPE_QUAL_RESTRICT : 0)
5125 | (volatilep ? TYPE_QUAL_VOLATILE : 0));
5128 declarator = TREE_OPERAND (declarator, 0);
5135 /* Now TYPE has the actual type. */
5137 /* Did array size calculations overflow? */
5139 if (TREE_CODE (type) == ARRAY_TYPE
5141 && TREE_OVERFLOW (TYPE_SIZE (type)))
5142 error ("size of array `%s' is too large", name);
5144 /* If this is declaring a typedef name, return a TYPE_DECL. */
5146 if (specbits & (1 << (int) RID_TYPEDEF))
5149 /* Note that the grammar rejects storage classes
5150 in typenames, fields or parameters */
5151 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
5153 pedwarn ("ANSI C forbids qualified function types");
5155 type = c_build_qualified_type (type, type_quals);
5156 decl = build_decl (TYPE_DECL, declarator, type);
5157 if ((specbits & (1 << (int) RID_SIGNED))
5158 || (typedef_decl && C_TYPEDEF_EXPLICITLY_SIGNED (typedef_decl)))
5159 C_TYPEDEF_EXPLICITLY_SIGNED (decl) = 1;
5164 /* Detect the case of an array type of unspecified size
5165 which came, as such, direct from a typedef name.
5166 We must copy the type, so that each identifier gets
5167 a distinct type, so that each identifier's size can be
5168 controlled separately by its own initializer. */
5170 if (type != 0 && typedef_type != 0
5171 && TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (typedef_type)
5172 && TREE_CODE (type) == ARRAY_TYPE && TYPE_DOMAIN (type) == 0)
5174 type = build_array_type (TREE_TYPE (type), 0);
5176 C_TYPE_VARIABLE_SIZE (type) = 1;
5179 /* If this is a type name (such as, in a cast or sizeof),
5180 compute the type and return it now. */
5182 if (decl_context == TYPENAME)
5184 /* Note that the grammar rejects storage classes
5185 in typenames, fields or parameters */
5186 if (pedantic && TREE_CODE (type) == FUNCTION_TYPE
5188 pedwarn ("ANSI C forbids const or volatile function types");
5190 type = c_build_qualified_type (type, type_quals);
5195 /* Aside from typedefs and type names (handle above),
5196 `void' at top level (not within pointer)
5197 is allowed only in public variables.
5198 We don't complain about parms either, but that is because
5199 a better error message can be made later. */
5201 if (TYPE_MAIN_VARIANT (type) == void_type_node && decl_context != PARM
5202 && ! ((decl_context != FIELD && TREE_CODE (type) != FUNCTION_TYPE)
5203 && ((specbits & (1 << (int) RID_EXTERN))
5204 || (current_binding_level == global_binding_level
5206 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)))))))
5208 error ("variable or field `%s' declared void", name);
5209 type = integer_type_node;
5212 /* Now create the decl, which may be a VAR_DECL, a PARM_DECL
5213 or a FUNCTION_DECL, depending on DECL_CONTEXT and TYPE. */
5218 if (decl_context == PARM)
5220 tree type_as_written = type;
5223 /* A parameter declared as an array of T is really a pointer to T.
5224 One declared as a function is really a pointer to a function. */
5226 if (TREE_CODE (type) == ARRAY_TYPE)
5228 /* Transfer const-ness of array into that of type pointed to. */
5229 type = TREE_TYPE (type);
5231 type = c_build_qualified_type (type, type_quals);
5232 type = build_pointer_type (type);
5233 type_quals = TYPE_UNQUALIFIED;
5236 else if (TREE_CODE (type) == FUNCTION_TYPE)
5238 if (pedantic && type_quals)
5239 pedwarn ("ANSI C forbids qualified function types");
5241 type = c_build_qualified_type (type, type_quals);
5242 type = build_pointer_type (type);
5243 type_quals = TYPE_UNQUALIFIED;
5246 decl = build_decl (PARM_DECL, declarator, type);
5248 C_DECL_VARIABLE_SIZE (decl) = 1;
5250 /* Compute the type actually passed in the parmlist,
5251 for the case where there is no prototype.
5252 (For example, shorts and chars are passed as ints.)
5253 When there is a prototype, this is overridden later. */
5255 DECL_ARG_TYPE (decl) = type;
5256 main_type = (type == error_mark_node
5258 : TYPE_MAIN_VARIANT (type));
5259 if (main_type == float_type_node)
5260 DECL_ARG_TYPE (decl) = double_type_node;
5261 /* Don't use TYPE_PRECISION to decide whether to promote,
5262 because we should convert short if it's the same size as int,
5263 but we should not convert long if it's the same size as int. */
5264 else if (TREE_CODE (main_type) != ERROR_MARK
5265 && C_PROMOTING_INTEGER_TYPE_P (main_type))
5267 if (TYPE_PRECISION (type) == TYPE_PRECISION (integer_type_node)
5268 && TREE_UNSIGNED (type))
5269 DECL_ARG_TYPE (decl) = unsigned_type_node;
5271 DECL_ARG_TYPE (decl) = integer_type_node;
5274 DECL_ARG_TYPE_AS_WRITTEN (decl) = type_as_written;
5276 else if (decl_context == FIELD)
5278 /* Structure field. It may not be a function. */
5280 if (TREE_CODE (type) == FUNCTION_TYPE)
5282 error ("field `%s' declared as a function", name);
5283 type = build_pointer_type (type);
5285 else if (TREE_CODE (type) != ERROR_MARK && TYPE_SIZE (type) == 0)
5287 error ("field `%s' has incomplete type", name);
5288 type = error_mark_node;
5290 /* Move type qualifiers down to element of an array. */
5291 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
5293 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
5295 TYPE_DOMAIN (type));
5296 #if 0 /* Leave the field const or volatile as well. */
5297 type_quals = TYPE_UNQUALIFIED;
5300 decl = build_decl (FIELD_DECL, declarator, type);
5302 C_DECL_VARIABLE_SIZE (decl) = 1;
5304 else if (TREE_CODE (type) == FUNCTION_TYPE)
5306 /* Every function declaration is "external"
5307 except for those which are inside a function body
5308 in which `auto' is used.
5309 That is a case not specified by ANSI C,
5310 and we use it for forward declarations for nested functions. */
5311 int extern_ref = (!(specbits & (1 << (int) RID_AUTO))
5312 || current_binding_level == global_binding_level);
5314 if (specbits & (1 << (int) RID_AUTO)
5315 && (pedantic || current_binding_level == global_binding_level))
5316 pedwarn ("invalid storage class for function `%s'", name);
5317 if (specbits & (1 << (int) RID_REGISTER))
5318 error ("invalid storage class for function `%s'", name);
5319 /* Function declaration not at top level.
5320 Storage classes other than `extern' are not allowed
5321 and `extern' makes no difference. */
5322 if (current_binding_level != global_binding_level
5323 && (specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_INLINE)))
5325 pedwarn ("invalid storage class for function `%s'", name);
5327 /* If this is a block level extern, it must live past the end
5328 of the function so that we can check it against other
5329 extern declarations (IDENTIFIER_LIMBO_VALUE). */
5330 if (extern_ref && allocation_temporary_p ())
5331 end_temporary_allocation ();
5333 decl = build_decl (FUNCTION_DECL, declarator, type);
5334 decl = build_decl_attribute_variant (decl, decl_machine_attr);
5336 if (pedantic && type_quals && ! DECL_IN_SYSTEM_HEADER (decl))
5337 pedwarn ("ANSI C forbids qualified function types");
5340 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl))) == void_type_node
5341 && TYPE_QUALS (TREE_TYPE (TREE_TYPE (decl)))
5342 && ! DECL_IN_SYSTEM_HEADER (decl))
5343 pedwarn ("ANSI C forbids qualified void function return type");
5345 /* GNU C interprets a `volatile void' return type to indicate
5346 that the function does not return. */
5347 if ((type_quals & TYPE_QUAL_VOLATILE)
5348 && TREE_TYPE (TREE_TYPE (decl)) != void_type_node)
5349 warning ("`noreturn' function returns non-void value");
5352 DECL_EXTERNAL (decl) = 1;
5353 /* Record absence of global scope for `static' or `auto'. */
5355 = !(specbits & ((1 << (int) RID_STATIC) | (1 << (int) RID_AUTO)));
5357 /* Record presence of `inline', if it is reasonable. */
5360 if (! strcmp (IDENTIFIER_POINTER (declarator), "main"))
5361 warning ("cannot inline function `main'");
5363 /* Assume that otherwise the function can be inlined. */
5364 DECL_INLINE (decl) = 1;
5366 if (specbits & (1 << (int) RID_EXTERN))
5367 current_extern_inline = 1;
5372 /* It's a variable. */
5373 /* An uninitialized decl with `extern' is a reference. */
5374 int extern_ref = !initialized && (specbits & (1 << (int) RID_EXTERN));
5376 /* Move type qualifiers down to element of an array. */
5377 if (TREE_CODE (type) == ARRAY_TYPE && type_quals)
5379 type = build_array_type (c_build_qualified_type (TREE_TYPE (type),
5381 TYPE_DOMAIN (type));
5382 #if 0 /* Leave the variable const or volatile as well. */
5383 type_quals = TYPE_UNQUALIFIED;
5387 /* If this is a block level extern, it must live past the end
5388 of the function so that we can check it against other
5389 extern declarations (IDENTIFIER_LIMBO_VALUE). */
5390 if (extern_ref && allocation_temporary_p ())
5391 end_temporary_allocation ();
5393 decl = build_decl (VAR_DECL, declarator, type);
5395 C_DECL_VARIABLE_SIZE (decl) = 1;
5398 pedwarn_with_decl (decl, "variable `%s' declared `inline'");
5400 DECL_EXTERNAL (decl) = extern_ref;
5401 /* At top level, the presence of a `static' or `register' storage
5402 class specifier, or the absence of all storage class specifiers
5403 makes this declaration a definition (perhaps tentative). Also,
5404 the absence of both `static' and `register' makes it public. */
5405 if (current_binding_level == global_binding_level)
5409 & ((1 << (int) RID_STATIC) | (1 << (int) RID_REGISTER)));
5410 TREE_STATIC (decl) = ! DECL_EXTERNAL (decl);
5412 /* Not at top level, only `static' makes a static definition. */
5415 TREE_STATIC (decl) = (specbits & (1 << (int) RID_STATIC)) != 0;
5416 TREE_PUBLIC (decl) = DECL_EXTERNAL (decl);
5419 if (specbits & 1 << (int) RID_ITERATOR)
5420 ITERATOR_P (decl) = 1;
5423 /* Record `register' declaration for warnings on &
5424 and in case doing stupid register allocation. */
5426 if (specbits & (1 << (int) RID_REGISTER))
5427 DECL_REGISTER (decl) = 1;
5429 /* Record constancy and volatility. */
5430 c_apply_type_quals_to_decl (type_quals, decl);
5432 /* If a type has volatile components, it should be stored in memory.
5433 Otherwise, the fact that those components are volatile
5434 will be ignored, and would even crash the compiler. */
5435 if (C_TYPE_FIELDS_VOLATILE (TREE_TYPE (decl)))
5436 mark_addressable (decl);
5444 /* Decode the parameter-list info for a function type or function definition.
5445 The argument is the value returned by `get_parm_info' (or made in parse.y
5446 if there is an identifier list instead of a parameter decl list).
5447 These two functions are separate because when a function returns
5448 or receives functions then each is called multiple times but the order
5449 of calls is different. The last call to `grokparms' is always the one
5450 that contains the formal parameter names of a function definition.
5452 Store in `last_function_parms' a chain of the decls of parms.
5453 Also store in `last_function_parm_tags' a chain of the struct, union,
5454 and enum tags declared among the parms.
5456 Return a list of arg types to use in the FUNCTION_TYPE for this function.
5458 FUNCDEF_FLAG is nonzero for a function definition, 0 for
5459 a mere declaration. A nonempty identifier-list gets an error message
5460 when FUNCDEF_FLAG is zero. */
5463 grokparms (parms_info, funcdef_flag)
5467 tree first_parm = TREE_CHAIN (parms_info);
5469 last_function_parms = TREE_PURPOSE (parms_info);
5470 last_function_parm_tags = TREE_VALUE (parms_info);
5472 if (warn_strict_prototypes && first_parm == 0 && !funcdef_flag
5473 && !in_system_header)
5474 warning ("function declaration isn't a prototype");
5477 && TREE_CODE (TREE_VALUE (first_parm)) == IDENTIFIER_NODE)
5480 pedwarn ("parameter names (without types) in function declaration");
5482 last_function_parms = first_parm;
5489 /* We no longer test FUNCDEF_FLAG.
5490 If the arg types are incomplete in a declaration,
5491 they must include undefined tags.
5492 These tags can never be defined in the scope of the declaration,
5493 so the types can never be completed,
5494 and no call can be compiled successfully. */
5496 /* In a fcn definition, arg types must be complete. */
5499 for (parm = last_function_parms, typelt = first_parm;
5501 parm = TREE_CHAIN (parm))
5502 /* Skip over any enumeration constants declared here. */
5503 if (TREE_CODE (parm) == PARM_DECL)
5505 /* Barf if the parameter itself has an incomplete type. */
5506 tree type = TREE_VALUE (typelt);
5507 if (TYPE_SIZE (type) == 0)
5509 if (funcdef_flag && DECL_NAME (parm) != 0)
5510 error ("parameter `%s' has incomplete type",
5511 IDENTIFIER_POINTER (DECL_NAME (parm)));
5513 warning ("parameter has incomplete type");
5516 TREE_VALUE (typelt) = error_mark_node;
5517 TREE_TYPE (parm) = error_mark_node;
5520 #if 0 /* This has been replaced by parm_tags_warning
5521 which uses a more accurate criterion for what to warn about. */
5524 /* Now warn if is a pointer to an incomplete type. */
5525 while (TREE_CODE (type) == POINTER_TYPE
5526 || TREE_CODE (type) == REFERENCE_TYPE)
5527 type = TREE_TYPE (type);
5528 type = TYPE_MAIN_VARIANT (type);
5529 if (TYPE_SIZE (type) == 0)
5531 if (DECL_NAME (parm) != 0)
5532 warning ("parameter `%s' points to incomplete type",
5533 IDENTIFIER_POINTER (DECL_NAME (parm)));
5535 warning ("parameter points to incomplete type");
5539 typelt = TREE_CHAIN (typelt);
5542 /* Allocate the list of types the way we allocate a type. */
5543 if (first_parm && ! TREE_PERMANENT (first_parm))
5545 /* Construct a copy of the list of types
5546 on the saveable obstack. */
5548 for (typelt = first_parm; typelt; typelt = TREE_CHAIN (typelt))
5549 result = saveable_tree_cons (NULL_TREE, TREE_VALUE (typelt),
5551 return nreverse (result);
5554 /* The list we have is permanent already. */
5560 /* Return a tree_list node with info on a parameter list just parsed.
5561 The TREE_PURPOSE is a chain of decls of those parms.
5562 The TREE_VALUE is a list of structure, union and enum tags defined.
5563 The TREE_CHAIN is a list of argument types to go in the FUNCTION_TYPE.
5564 This tree_list node is later fed to `grokparms'.
5566 VOID_AT_END nonzero means append `void' to the end of the type-list.
5567 Zero means the parmlist ended with an ellipsis so don't append `void'. */
5570 get_parm_info (void_at_end)
5573 register tree decl, t;
5574 register tree types = 0;
5576 tree tags = gettags ();
5577 tree parms = getdecls ();
5579 tree order = current_binding_level->parm_order;
5581 /* Just `void' (and no ellipsis) is special. There are really no parms. */
5582 if (void_at_end && parms != 0
5583 && TREE_CHAIN (parms) == 0
5584 && TYPE_MAIN_VARIANT (TREE_TYPE (parms)) == void_type_node
5585 && DECL_NAME (parms) == 0)
5588 storedecls (NULL_TREE);
5589 return saveable_tree_cons (NULL_TREE, NULL_TREE,
5590 saveable_tree_cons (NULL_TREE, void_type_node, NULL_TREE));
5593 /* Extract enumerator values and other non-parms declared with the parms.
5594 Likewise any forward parm decls that didn't have real parm decls. */
5595 for (decl = parms; decl; )
5597 tree next = TREE_CHAIN (decl);
5599 if (TREE_CODE (decl) != PARM_DECL)
5601 TREE_CHAIN (decl) = new_parms;
5604 else if (TREE_ASM_WRITTEN (decl))
5606 error_with_decl (decl, "parameter `%s' has just a forward declaration");
5607 TREE_CHAIN (decl) = new_parms;
5613 /* Put the parm decls back in the order they were in in the parm list. */
5614 for (t = order; t; t = TREE_CHAIN (t))
5617 TREE_CHAIN (TREE_VALUE (t)) = TREE_VALUE (TREE_CHAIN (t));
5619 TREE_CHAIN (TREE_VALUE (t)) = 0;
5622 new_parms = chainon (order ? nreverse (TREE_VALUE (order)) : 0,
5625 /* Store the parmlist in the binding level since the old one
5626 is no longer a valid list. (We have changed the chain pointers.) */
5627 storedecls (new_parms);
5629 for (decl = new_parms; decl; decl = TREE_CHAIN (decl))
5630 /* There may also be declarations for enumerators if an enumeration
5631 type is declared among the parms. Ignore them here. */
5632 if (TREE_CODE (decl) == PARM_DECL)
5634 /* Since there is a prototype,
5635 args are passed in their declared types. */
5636 tree type = TREE_TYPE (decl);
5637 DECL_ARG_TYPE (decl) = type;
5638 #ifdef PROMOTE_PROTOTYPES
5639 if ((TREE_CODE (type) == INTEGER_TYPE
5640 || TREE_CODE (type) == ENUMERAL_TYPE)
5641 && TYPE_PRECISION (type) < TYPE_PRECISION (integer_type_node))
5642 DECL_ARG_TYPE (decl) = integer_type_node;
5645 types = saveable_tree_cons (NULL_TREE, TREE_TYPE (decl), types);
5646 if (TYPE_MAIN_VARIANT (TREE_VALUE (types)) == void_type_node && ! erred
5647 && DECL_NAME (decl) == 0)
5649 error ("`void' in parameter list must be the entire list");
5655 return saveable_tree_cons (new_parms, tags,
5656 nreverse (saveable_tree_cons (NULL_TREE, void_type_node, types)));
5658 return saveable_tree_cons (new_parms, tags, nreverse (types));
5661 /* At end of parameter list, warn about any struct, union or enum tags
5662 defined within. Do so because these types cannot ever become complete. */
5665 parmlist_tags_warning ()
5670 for (elt = current_binding_level->tags; elt; elt = TREE_CHAIN (elt))
5672 enum tree_code code = TREE_CODE (TREE_VALUE (elt));
5673 /* An anonymous union parm type is meaningful as a GNU extension.
5674 So don't warn for that. */
5675 if (code == UNION_TYPE && TREE_PURPOSE (elt) == 0 && !pedantic)
5677 if (TREE_PURPOSE (elt) != 0)
5678 warning ("`%s %s' declared inside parameter list",
5679 (code == RECORD_TYPE ? "struct"
5680 : code == UNION_TYPE ? "union"
5682 IDENTIFIER_POINTER (TREE_PURPOSE (elt)));
5684 warning ("anonymous %s declared inside parameter list",
5685 (code == RECORD_TYPE ? "struct"
5686 : code == UNION_TYPE ? "union"
5691 warning ("its scope is only this definition or declaration, which is probably not what you want.");
5697 /* Get the struct, enum or union (CODE says which) with tag NAME.
5698 Define the tag as a forward-reference if it is not defined. */
5701 xref_tag (code, name)
5702 enum tree_code code;
5705 int temporary = allocation_temporary_p ();
5707 /* If a cross reference is requested, look up the type
5708 already defined for this tag and return it. */
5710 register tree ref = lookup_tag (code, name, current_binding_level, 0);
5711 /* Even if this is the wrong type of tag, return what we found.
5712 There will be an error message anyway, from pending_xref_error.
5713 If we create an empty xref just for an invalid use of the type,
5714 the main result is to create lots of superfluous error messages. */
5718 push_obstacks_nochange ();
5720 if (current_binding_level == global_binding_level && temporary)
5721 end_temporary_allocation ();
5723 /* If no such tag is yet defined, create a forward-reference node
5724 and record it as the "definition".
5725 When a real declaration of this type is found,
5726 the forward-reference will be altered into a real type. */
5728 ref = make_node (code);
5729 if (code == ENUMERAL_TYPE)
5731 /* (In ANSI, Enums can be referred to only if already defined.) */
5733 pedwarn ("ANSI C forbids forward references to `enum' types");
5734 /* Give the type a default layout like unsigned int
5735 to avoid crashing if it does not get defined. */
5736 TYPE_MODE (ref) = TYPE_MODE (unsigned_type_node);
5737 TYPE_ALIGN (ref) = TYPE_ALIGN (unsigned_type_node);
5738 TREE_UNSIGNED (ref) = 1;
5739 TYPE_PRECISION (ref) = TYPE_PRECISION (unsigned_type_node);
5740 TYPE_MIN_VALUE (ref) = TYPE_MIN_VALUE (unsigned_type_node);
5741 TYPE_MAX_VALUE (ref) = TYPE_MAX_VALUE (unsigned_type_node);
5744 pushtag (name, ref);
5751 /* Make sure that the tag NAME is defined *in the current binding level*
5752 at least as a forward reference.
5753 CODE says which kind of tag NAME ought to be.
5755 We also do a push_obstacks_nochange
5756 whose matching pop is in finish_struct. */
5759 start_struct (code, name)
5760 enum tree_code code;
5763 /* If there is already a tag defined at this binding level
5764 (as a forward reference), just return it. */
5766 register tree ref = 0;
5768 push_obstacks_nochange ();
5769 if (current_binding_level == global_binding_level)
5770 end_temporary_allocation ();
5773 ref = lookup_tag (code, name, current_binding_level, 1);
5774 if (ref && TREE_CODE (ref) == code)
5776 C_TYPE_BEING_DEFINED (ref) = 1;
5777 TYPE_PACKED (ref) = flag_pack_struct;
5778 if (TYPE_FIELDS (ref))
5779 error ((code == UNION_TYPE ? "redefinition of `union %s'"
5780 : "redefinition of `struct %s'"),
5781 IDENTIFIER_POINTER (name));
5786 /* Otherwise create a forward-reference just so the tag is in scope. */
5788 ref = make_node (code);
5789 pushtag (name, ref);
5790 C_TYPE_BEING_DEFINED (ref) = 1;
5791 TYPE_PACKED (ref) = flag_pack_struct;
5795 /* Process the specs, declarator (NULL if omitted) and width (NULL if omitted)
5796 of a structure component, returning a FIELD_DECL node.
5797 WIDTH is non-NULL for bit fields only, and is an INTEGER_CST node.
5799 This is done during the parsing of the struct declaration.
5800 The FIELD_DECL nodes are chained together and the lot of them
5801 are ultimately passed to `build_struct' to make the RECORD_TYPE node. */
5804 grokfield (filename, line, declarator, declspecs, width)
5805 const char *filename ATTRIBUTE_UNUSED;
5806 int line ATTRIBUTE_UNUSED;
5807 tree declarator, declspecs, width;
5811 /* The corresponding pop_obstacks is in finish_decl. */
5812 push_obstacks_nochange ();
5814 value = grokdeclarator (declarator, declspecs, width ? BITFIELD : FIELD, 0);
5816 finish_decl (value, NULL_TREE, NULL_TREE);
5817 DECL_INITIAL (value) = width;
5819 maybe_objc_check_decl (value);
5823 /* Function to help qsort sort FIELD_DECLs by name order. */
5826 field_decl_cmp (xp, yp)
5827 const GENERIC_PTR xp;
5828 const GENERIC_PTR yp;
5830 tree *x = (tree *)xp, *y = (tree *)yp;
5832 if (DECL_NAME (*x) == DECL_NAME (*y))
5834 if (DECL_NAME (*x) == NULL)
5836 if (DECL_NAME (*y) == NULL)
5838 if (DECL_NAME (*x) < DECL_NAME (*y))
5843 /* Fill in the fields of a RECORD_TYPE or UNION_TYPE node, T.
5844 FIELDLIST is a chain of FIELD_DECL nodes for the fields.
5845 ATTRIBUTES are attributes to be applied to the structure.
5847 We also do a pop_obstacks to match the push in start_struct. */
5850 finish_struct (t, fieldlist, attributes)
5857 int toplevel = global_binding_level == current_binding_level;
5859 /* If this type was previously laid out as a forward reference,
5860 make sure we lay it out again. */
5864 decl_attributes (t, attributes, NULL_TREE);
5866 /* Nameless union parm types are useful as GCC extension. */
5867 if (! (TREE_CODE (t) == UNION_TYPE && TYPE_NAME (t) == 0) && !pedantic)
5868 /* Otherwise, warn about any struct or union def. in parmlist. */
5869 if (in_parm_level_p ())
5872 pedwarn ((TREE_CODE (t) == UNION_TYPE ? "union defined inside parms"
5873 : "structure defined inside parms"));
5874 else if (! flag_traditional)
5875 warning ((TREE_CODE (t) == UNION_TYPE ? "union defined inside parms"
5876 : "structure defined inside parms"));
5879 old_momentary = suspend_momentary ();
5883 for (x = fieldlist; x; x = TREE_CHAIN (x))
5884 if (DECL_NAME (x) != 0)
5889 ? "%s has no named members"
5890 : "%s has no members"),
5891 TREE_CODE (t) == UNION_TYPE ? "union" : "struct");
5894 /* Install struct as DECL_CONTEXT of each field decl.
5895 Also process specified field sizes.
5896 Set DECL_FIELD_SIZE to the specified size, or 0 if none specified.
5897 The specified size is found in the DECL_INITIAL.
5898 Store 0 there, except for ": 0" fields (so we can find them
5899 and delete them, below). */
5901 for (x = fieldlist; x; x = TREE_CHAIN (x))
5903 DECL_CONTEXT (x) = t;
5904 DECL_PACKED (x) |= TYPE_PACKED (t);
5905 DECL_FIELD_SIZE (x) = 0;
5907 /* If any field is const, the structure type is pseudo-const. */
5908 if (TREE_READONLY (x))
5909 C_TYPE_FIELDS_READONLY (t) = 1;
5912 /* A field that is pseudo-const makes the structure likewise. */
5913 tree t1 = TREE_TYPE (x);
5914 while (TREE_CODE (t1) == ARRAY_TYPE)
5915 t1 = TREE_TYPE (t1);
5916 if ((TREE_CODE (t1) == RECORD_TYPE || TREE_CODE (t1) == UNION_TYPE)
5917 && C_TYPE_FIELDS_READONLY (t1))
5918 C_TYPE_FIELDS_READONLY (t) = 1;
5921 /* Any field that is volatile means variables of this type must be
5922 treated in some ways as volatile. */
5923 if (TREE_THIS_VOLATILE (x))
5924 C_TYPE_FIELDS_VOLATILE (t) = 1;
5926 /* Any field of nominal variable size implies structure is too. */
5927 if (C_DECL_VARIABLE_SIZE (x))
5928 C_TYPE_VARIABLE_SIZE (t) = 1;
5930 /* Detect invalid nested redefinition. */
5931 if (TREE_TYPE (x) == t)
5932 error ("nested redefinition of `%s'",
5933 IDENTIFIER_POINTER (TYPE_NAME (t)));
5935 /* Detect invalid bit-field size. */
5936 if (DECL_INITIAL (x))
5937 STRIP_NOPS (DECL_INITIAL (x));
5938 if (DECL_INITIAL (x))
5940 if (TREE_CODE (DECL_INITIAL (x)) == INTEGER_CST)
5941 constant_expression_warning (DECL_INITIAL (x));
5944 error_with_decl (x, "bit-field `%s' width not an integer constant");
5945 DECL_INITIAL (x) = NULL;
5949 /* Detect invalid bit-field type. */
5950 if (DECL_INITIAL (x)
5951 && TREE_CODE (TREE_TYPE (x)) != INTEGER_TYPE
5952 && TREE_CODE (TREE_TYPE (x)) != ENUMERAL_TYPE)
5954 error_with_decl (x, "bit-field `%s' has invalid type");
5955 DECL_INITIAL (x) = NULL;
5957 if (DECL_INITIAL (x) && pedantic
5958 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != integer_type_node
5959 && TYPE_MAIN_VARIANT (TREE_TYPE (x)) != unsigned_type_node
5960 /* Accept an enum that's equivalent to int or unsigned int. */
5961 && !(TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5962 && (TYPE_PRECISION (TREE_TYPE (x))
5963 == TYPE_PRECISION (integer_type_node))))
5964 pedwarn_with_decl (x, "bit-field `%s' type invalid in ANSI C");
5966 /* Detect and ignore out of range field width. */
5967 if (DECL_INITIAL (x))
5969 unsigned HOST_WIDE_INT width = TREE_INT_CST_LOW (DECL_INITIAL (x));
5971 if (tree_int_cst_sgn (DECL_INITIAL (x)) < 0)
5973 DECL_INITIAL (x) = NULL;
5974 error_with_decl (x, "negative width in bit-field `%s'");
5976 else if (TREE_INT_CST_HIGH (DECL_INITIAL (x)) != 0
5977 || width > TYPE_PRECISION (TREE_TYPE (x)))
5979 DECL_INITIAL (x) = NULL;
5980 pedwarn_with_decl (x, "width of `%s' exceeds its type");
5982 else if (width == 0 && DECL_NAME (x) != 0)
5984 error_with_decl (x, "zero width for bit-field `%s'");
5985 DECL_INITIAL (x) = NULL;
5989 /* Process valid field width. */
5990 if (DECL_INITIAL (x))
5992 register int width = TREE_INT_CST_LOW (DECL_INITIAL (x));
5994 if (TREE_CODE (TREE_TYPE (x)) == ENUMERAL_TYPE
5995 && (width < min_precision (TYPE_MIN_VALUE (TREE_TYPE (x)),
5996 TREE_UNSIGNED (TREE_TYPE (x)))
5997 || width < min_precision (TYPE_MAX_VALUE (TREE_TYPE (x)),
5998 TREE_UNSIGNED (TREE_TYPE (x)))))
5999 warning_with_decl (x, "`%s' is narrower than values of its type");
6001 DECL_FIELD_SIZE (x) = width;
6002 DECL_BIT_FIELD (x) = DECL_C_BIT_FIELD (x) = 1;
6003 DECL_INITIAL (x) = NULL;
6007 /* field size 0 => force desired amount of alignment. */
6008 #ifdef EMPTY_FIELD_BOUNDARY
6009 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), EMPTY_FIELD_BOUNDARY);
6011 #ifdef PCC_BITFIELD_TYPE_MATTERS
6012 if (PCC_BITFIELD_TYPE_MATTERS)
6013 DECL_ALIGN (x) = MAX (DECL_ALIGN (x),
6014 TYPE_ALIGN (TREE_TYPE (x)));
6018 else if (TREE_TYPE (x) != error_mark_node)
6020 unsigned int min_align = (DECL_PACKED (x) ? BITS_PER_UNIT
6021 : TYPE_ALIGN (TREE_TYPE (x)));
6022 /* Non-bit-fields are aligned for their type, except packed
6023 fields which require only BITS_PER_UNIT alignment. */
6024 DECL_ALIGN (x) = MAX (DECL_ALIGN (x), min_align);
6028 /* Now DECL_INITIAL is null on all members. */
6030 /* Delete all duplicate fields from the fieldlist */
6031 for (x = fieldlist; x && TREE_CHAIN (x);)
6032 /* Anonymous fields aren't duplicates. */
6033 if (DECL_NAME (TREE_CHAIN (x)) == 0)
6037 register tree y = fieldlist;
6041 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
6047 if (DECL_NAME (y) == DECL_NAME (TREE_CHAIN (x)))
6049 error_with_decl (TREE_CHAIN (x), "duplicate member `%s'");
6050 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
6052 else x = TREE_CHAIN (x);
6055 /* Now we have the nearly final fieldlist. Record it,
6056 then lay out the structure or union (including the fields). */
6058 TYPE_FIELDS (t) = fieldlist;
6062 /* Delete all zero-width bit-fields from the front of the fieldlist */
6064 && DECL_INITIAL (fieldlist))
6065 fieldlist = TREE_CHAIN (fieldlist);
6066 /* Delete all such members from the rest of the fieldlist */
6067 for (x = fieldlist; x;)
6069 if (TREE_CHAIN (x) && DECL_INITIAL (TREE_CHAIN (x)))
6070 TREE_CHAIN (x) = TREE_CHAIN (TREE_CHAIN (x));
6071 else x = TREE_CHAIN (x);
6074 /* Now we have the truly final field list.
6075 Store it in this type and in the variants. */
6077 TYPE_FIELDS (t) = fieldlist;
6079 /* If there are lots of fields, sort so we can look through them fast.
6080 We arbitrarily consider 16 or more elts to be "a lot". */
6084 for (x = fieldlist; x; x = TREE_CHAIN (x))
6095 len += list_length (x);
6096 /* Use the same allocation policy here that make_node uses, to
6097 ensure that this lives as long as the rest of the struct decl.
6098 All decls in an inline function need to be saved. */
6099 if (allocation_temporary_p ())
6100 space = savealloc (sizeof (struct lang_type) + len * sizeof (tree));
6102 space = oballoc (sizeof (struct lang_type) + len * sizeof (tree));
6104 TYPE_LANG_SPECIFIC (t) = (struct lang_type *) space;
6105 TYPE_LANG_SPECIFIC (t)->len = len;
6107 field_array = &TYPE_LANG_SPECIFIC (t)->elts[0];
6109 for (x = fieldlist; x; x = TREE_CHAIN (x))
6110 field_array[len++] = x;
6112 qsort (field_array, len, sizeof (tree), field_decl_cmp);
6116 for (x = TYPE_MAIN_VARIANT (t); x; x = TYPE_NEXT_VARIANT (x))
6118 TYPE_FIELDS (x) = TYPE_FIELDS (t);
6119 TYPE_LANG_SPECIFIC (x) = TYPE_LANG_SPECIFIC (t);
6120 TYPE_ALIGN (x) = TYPE_ALIGN (t);
6123 /* If this was supposed to be a transparent union, but we can't
6124 make it one, warn and turn off the flag. */
6125 if (TREE_CODE (t) == UNION_TYPE
6126 && TYPE_TRANSPARENT_UNION (t)
6127 && TYPE_MODE (t) != DECL_MODE (TYPE_FIELDS (t)))
6129 TYPE_TRANSPARENT_UNION (t) = 0;
6130 warning ("union cannot be made transparent");
6133 /* If this structure or union completes the type of any previous
6134 variable declaration, lay it out and output its rtl. */
6136 if (current_binding_level->n_incomplete != 0)
6139 for (decl = current_binding_level->names; decl; decl = TREE_CHAIN (decl))
6141 if (TREE_TYPE (decl) == t
6142 && TREE_CODE (decl) != TYPE_DECL)
6144 layout_decl (decl, 0);
6145 /* This is a no-op in c-lang.c or something real in objc-actions.c. */
6146 maybe_objc_check_decl (decl);
6147 rest_of_decl_compilation (decl, NULL_PTR, toplevel, 0);
6150 --current_binding_level->n_incomplete;
6152 else if (TYPE_SIZE (TREE_TYPE (decl)) == 0
6153 && TREE_CODE (TREE_TYPE (decl)) == ARRAY_TYPE)
6155 tree element = TREE_TYPE (decl);
6156 while (TREE_CODE (element) == ARRAY_TYPE)
6157 element = TREE_TYPE (element);
6159 layout_array_type (TREE_TYPE (decl));
6164 resume_momentary (old_momentary);
6166 /* Finish debugging output for this type. */
6167 rest_of_type_compilation (t, toplevel);
6169 /* The matching push is in start_struct. */
6175 /* Lay out the type T, and its element type, and so on. */
6178 layout_array_type (t)
6181 if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE)
6182 layout_array_type (TREE_TYPE (t));
6186 /* Begin compiling the definition of an enumeration type.
6187 NAME is its name (or null if anonymous).
6188 Returns the type object, as yet incomplete.
6189 Also records info about it so that build_enumerator
6190 may be used to declare the individual values as they are read. */
6196 register tree enumtype = 0;
6198 /* If this is the real definition for a previous forward reference,
6199 fill in the contents in the same object that used to be the
6200 forward reference. */
6203 enumtype = lookup_tag (ENUMERAL_TYPE, name, current_binding_level, 1);
6205 /* The corresponding pop_obstacks is in finish_enum. */
6206 push_obstacks_nochange ();
6207 /* If these symbols and types are global, make them permanent. */
6208 if (current_binding_level == global_binding_level)
6209 end_temporary_allocation ();
6211 if (enumtype == 0 || TREE_CODE (enumtype) != ENUMERAL_TYPE)
6213 enumtype = make_node (ENUMERAL_TYPE);
6214 pushtag (name, enumtype);
6217 C_TYPE_BEING_DEFINED (enumtype) = 1;
6219 if (TYPE_VALUES (enumtype) != 0)
6221 /* This enum is a named one that has been declared already. */
6222 error ("redeclaration of `enum %s'", IDENTIFIER_POINTER (name));
6224 /* Completely replace its old definition.
6225 The old enumerators remain defined, however. */
6226 TYPE_VALUES (enumtype) = 0;
6229 enum_next_value = integer_zero_node;
6232 if (flag_short_enums)
6233 TYPE_PACKED (enumtype) = 1;
6238 /* After processing and defining all the values of an enumeration type,
6239 install their decls in the enumeration type and finish it off.
6240 ENUMTYPE is the type object, VALUES a list of decl-value pairs,
6241 and ATTRIBUTES are the specified attributes.
6242 Returns ENUMTYPE. */
6245 finish_enum (enumtype, values, attributes)
6250 register tree pair, tem;
6251 tree minnode = 0, maxnode = 0;
6252 int lowprec, highprec, precision;
6253 int toplevel = global_binding_level == current_binding_level;
6255 if (in_parm_level_p ())
6256 warning ("enum defined inside parms");
6258 decl_attributes (enumtype, attributes, NULL_TREE);
6260 /* Calculate the maximum value of any enumerator in this type. */
6262 if (values == error_mark_node)
6263 minnode = maxnode = integer_zero_node;
6265 for (pair = values; pair; pair = TREE_CHAIN (pair))
6267 tree value = TREE_VALUE (pair);
6269 minnode = maxnode = TREE_VALUE (pair);
6272 if (tree_int_cst_lt (maxnode, value))
6274 if (tree_int_cst_lt (value, minnode))
6279 TYPE_MIN_VALUE (enumtype) = minnode;
6280 TYPE_MAX_VALUE (enumtype) = maxnode;
6282 /* An enum can have some negative values; then it is signed. */
6283 TREE_UNSIGNED (enumtype) = tree_int_cst_sgn (minnode) >= 0;
6285 /* Determine the precision this type needs. */
6287 lowprec = min_precision (minnode, TREE_UNSIGNED (enumtype));
6288 highprec = min_precision (maxnode, TREE_UNSIGNED (enumtype));
6289 precision = MAX (lowprec, highprec);
6291 if (TYPE_PACKED (enumtype) || precision > TYPE_PRECISION (integer_type_node))
6293 tree narrowest = type_for_size (precision, 1);
6296 warning ("enumeration values exceed range of largest integer");
6297 narrowest = long_long_integer_type_node;
6300 TYPE_PRECISION (enumtype) = TYPE_PRECISION (narrowest);
6303 TYPE_PRECISION (enumtype) = TYPE_PRECISION (integer_type_node);
6305 TYPE_SIZE (enumtype) = 0;
6306 layout_type (enumtype);
6308 if (values != error_mark_node)
6310 /* Change the type of the enumerators to be the enum type.
6311 Formerly this was done only for enums that fit in an int,
6312 but the comment said it was done only for enums wider than int.
6313 It seems necessary to do this for wide enums,
6314 and best not to change what's done for ordinary narrower ones. */
6315 for (pair = values; pair; pair = TREE_CHAIN (pair))
6317 TREE_TYPE (TREE_PURPOSE (pair)) = enumtype;
6318 DECL_SIZE (TREE_PURPOSE (pair)) = TYPE_SIZE (enumtype);
6319 if (TREE_CODE (TREE_PURPOSE (pair)) != FUNCTION_DECL)
6320 DECL_ALIGN (TREE_PURPOSE (pair)) = TYPE_ALIGN (enumtype);
6323 /* Replace the decl nodes in VALUES with their names. */
6324 for (pair = values; pair; pair = TREE_CHAIN (pair))
6325 TREE_PURPOSE (pair) = DECL_NAME (TREE_PURPOSE (pair));
6327 TYPE_VALUES (enumtype) = values;
6330 /* Fix up all variant types of this enum type. */
6331 for (tem = TYPE_MAIN_VARIANT (enumtype); tem; tem = TYPE_NEXT_VARIANT (tem))
6333 TYPE_VALUES (tem) = TYPE_VALUES (enumtype);
6334 TYPE_MIN_VALUE (tem) = TYPE_MIN_VALUE (enumtype);
6335 TYPE_MAX_VALUE (tem) = TYPE_MAX_VALUE (enumtype);
6336 TYPE_SIZE (tem) = TYPE_SIZE (enumtype);
6337 TYPE_SIZE_UNIT (tem) = TYPE_SIZE_UNIT (enumtype);
6338 TYPE_MODE (tem) = TYPE_MODE (enumtype);
6339 TYPE_PRECISION (tem) = TYPE_PRECISION (enumtype);
6340 TYPE_ALIGN (tem) = TYPE_ALIGN (enumtype);
6341 TREE_UNSIGNED (tem) = TREE_UNSIGNED (enumtype);
6344 /* Finish debugging output for this type. */
6345 rest_of_type_compilation (enumtype, toplevel);
6347 /* This matches a push in start_enum. */
6353 /* Build and install a CONST_DECL for one value of the
6354 current enumeration type (one that was begun with start_enum).
6355 Return a tree-list containing the CONST_DECL and its value.
6356 Assignment of sequential values by default is handled here. */
6359 build_enumerator (name, value)
6362 register tree decl, type;
6364 /* Validate and default VALUE. */
6366 /* Remove no-op casts from the value. */
6368 STRIP_TYPE_NOPS (value);
6372 if (TREE_CODE (value) == INTEGER_CST)
6374 value = default_conversion (value);
6375 constant_expression_warning (value);
6379 error ("enumerator value for `%s' not integer constant",
6380 IDENTIFIER_POINTER (name));
6385 /* Default based on previous value. */
6386 /* It should no longer be possible to have NON_LVALUE_EXPR
6390 value = enum_next_value;
6392 error ("overflow in enumeration values");
6395 if (pedantic && ! int_fits_type_p (value, integer_type_node))
6397 pedwarn ("ANSI C restricts enumerator values to range of `int'");
6398 value = integer_zero_node;
6401 /* Set basis for default for next value. */
6402 enum_next_value = build_binary_op (PLUS_EXPR, value, integer_one_node, 0);
6403 enum_overflow = tree_int_cst_lt (enum_next_value, value);
6405 /* Now create a declaration for the enum value name. */
6407 type = TREE_TYPE (value);
6408 type = type_for_size (MAX (TYPE_PRECISION (type),
6409 TYPE_PRECISION (integer_type_node)),
6411 || TYPE_PRECISION (type) >= TYPE_PRECISION (integer_type_node))
6412 && TREE_UNSIGNED (type)));
6414 decl = build_decl (CONST_DECL, name, type);
6415 DECL_INITIAL (decl) = value;
6416 TREE_TYPE (value) = type;
6419 return saveable_tree_cons (decl, value, NULL_TREE);
6422 /* Create the FUNCTION_DECL for a function definition.
6423 DECLSPECS, DECLARATOR, PREFIX_ATTRIBUTES and ATTRIBUTES are the parts of
6424 the declaration; they describe the function's name and the type it returns,
6425 but twisted together in a fashion that parallels the syntax of C.
6427 This function creates a binding context for the function body
6428 as well as setting up the FUNCTION_DECL in current_function_decl.
6430 Returns 1 on success. If the DECLARATOR is not suitable for a function
6431 (it defines a datum instead), we return 0, which tells
6432 yyparse to report a parse error.
6434 NESTED is nonzero for a function nested within another function. */
6437 start_function (declspecs, declarator, prefix_attributes, attributes, nested)
6438 tree declarator, declspecs, prefix_attributes, attributes;
6441 tree decl1, old_decl;
6443 int old_immediate_size_expand = immediate_size_expand;
6445 current_function_returns_value = 0; /* Assume, until we see it does. */
6446 current_function_returns_null = 0;
6447 warn_about_return_type = 0;
6448 current_extern_inline = 0;
6449 c_function_varargs = 0;
6451 shadowed_labels = 0;
6453 /* Don't expand any sizes in the return type of the function. */
6454 immediate_size_expand = 0;
6456 decl1 = grokdeclarator (declarator, declspecs, FUNCDEF, 1);
6458 /* If the declarator is not suitable for a function definition,
6459 cause a syntax error. */
6462 immediate_size_expand = old_immediate_size_expand;
6466 decl_attributes (decl1, prefix_attributes, attributes);
6468 announce_function (decl1);
6470 if (TYPE_SIZE (TREE_TYPE (TREE_TYPE (decl1))) == 0)
6472 error ("return-type is an incomplete type");
6473 /* Make it return void instead. */
6475 = build_function_type (void_type_node,
6476 TYPE_ARG_TYPES (TREE_TYPE (decl1)));
6479 if (warn_about_return_type)
6480 warning ("return-type defaults to `int'");
6482 /* Save the parm names or decls from this function's declarator
6483 where store_parm_decls will find them. */
6484 current_function_parms = last_function_parms;
6485 current_function_parm_tags = last_function_parm_tags;
6487 /* Make the init_value nonzero so pushdecl knows this is not tentative.
6488 error_mark_node is replaced below (in poplevel) with the BLOCK. */
6489 DECL_INITIAL (decl1) = error_mark_node;
6491 /* If this definition isn't a prototype and we had a prototype declaration
6492 before, copy the arg type info from that prototype.
6493 But not if what we had before was a builtin function. */
6494 old_decl = lookup_name_current_level (DECL_NAME (decl1));
6495 if (old_decl != 0 && TREE_CODE (TREE_TYPE (old_decl)) == FUNCTION_TYPE
6496 && !DECL_BUILT_IN (old_decl)
6497 && (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6498 == TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (old_decl))))
6499 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0)
6501 TREE_TYPE (decl1) = TREE_TYPE (old_decl);
6502 current_function_prototype_file = DECL_SOURCE_FILE (old_decl);
6503 current_function_prototype_line = DECL_SOURCE_LINE (old_decl);
6506 /* If there is no explicit declaration, look for any out-of-scope implicit
6509 old_decl = IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1));
6511 /* Optionally warn of old-fashioned def with no previous prototype. */
6512 if (warn_strict_prototypes
6513 && TYPE_ARG_TYPES (TREE_TYPE (decl1)) == 0
6514 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0)
6515 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))))
6516 warning ("function declaration isn't a prototype");
6517 /* Optionally warn of any global def with no previous prototype. */
6518 else if (warn_missing_prototypes
6519 && TREE_PUBLIC (decl1)
6520 && !(old_decl != 0 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) != 0)
6521 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))))
6522 warning_with_decl (decl1, "no previous prototype for `%s'");
6523 /* Optionally warn of any def with no previous prototype
6524 if the function has already been used. */
6525 else if (warn_missing_prototypes
6526 && old_decl != 0 && TREE_USED (old_decl)
6527 && TYPE_ARG_TYPES (TREE_TYPE (old_decl)) == 0)
6528 warning_with_decl (decl1,
6529 "`%s' was used with no prototype before its definition");
6530 /* Optionally warn of any global def with no previous declaration. */
6531 else if (warn_missing_declarations
6532 && TREE_PUBLIC (decl1)
6534 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))))
6535 warning_with_decl (decl1, "no previous declaration for `%s'");
6536 /* Optionally warn of any def with no previous declaration
6537 if the function has already been used. */
6538 else if (warn_missing_declarations
6539 && old_decl != 0 && TREE_USED (old_decl)
6540 && old_decl == IDENTIFIER_IMPLICIT_DECL (DECL_NAME (decl1)))
6541 warning_with_decl (decl1,
6542 "`%s' was used with no declaration before its definition");
6544 /* This is a definition, not a reference.
6545 So normally clear DECL_EXTERNAL.
6546 However, `extern inline' acts like a declaration
6547 except for defining how to inline. So set DECL_EXTERNAL in that case. */
6548 DECL_EXTERNAL (decl1) = current_extern_inline;
6550 #ifdef SET_DEFAULT_DECL_ATTRIBUTES
6551 SET_DEFAULT_DECL_ATTRIBUTES (decl1, attributes);
6554 /* This function exists in static storage.
6555 (This does not mean `static' in the C sense!) */
6556 TREE_STATIC (decl1) = 1;
6558 /* A nested function is not global. */
6559 if (current_function_decl != 0)
6560 TREE_PUBLIC (decl1) = 0;
6562 /* Warn for unlikely, improbable, or stupid declarations of `main'. */
6564 && strcmp ("main", IDENTIFIER_POINTER (DECL_NAME (decl1))) == 0)
6569 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (decl1)))
6570 != integer_type_node)
6571 pedwarn_with_decl (decl1, "return type of `%s' is not `int'");
6573 for (args = TYPE_ARG_TYPES (TREE_TYPE (decl1)); args;
6574 args = TREE_CHAIN (args))
6576 tree type = args ? TREE_VALUE (args) : 0;
6578 if (type == void_type_node)
6585 if (TYPE_MAIN_VARIANT (type) != integer_type_node)
6586 pedwarn_with_decl (decl1,
6587 "first argument of `%s' should be `int'");
6591 if (TREE_CODE (type) != POINTER_TYPE
6592 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6593 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6595 pedwarn_with_decl (decl1,
6596 "second argument of `%s' should be `char **'");
6600 if (TREE_CODE (type) != POINTER_TYPE
6601 || TREE_CODE (TREE_TYPE (type)) != POINTER_TYPE
6602 || (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (type)))
6604 pedwarn_with_decl (decl1,
6605 "third argument of `%s' should probably be `char **'");
6610 /* It is intentional that this message does not mention the third
6611 argument, which is warned for only pedantically, because it's
6612 blessed by mention in an appendix of the standard. */
6613 if (argct > 0 && (argct < 2 || argct > 3))
6614 pedwarn_with_decl (decl1, "`%s' takes only zero or two arguments");
6616 if (argct == 3 && pedantic)
6617 pedwarn_with_decl (decl1, "third argument of `%s' is deprecated");
6619 if (! TREE_PUBLIC (decl1))
6620 pedwarn_with_decl (decl1, "`%s' is normally a non-static function");
6623 /* Record the decl so that the function name is defined.
6624 If we already have a decl for this name, and it is a FUNCTION_DECL,
6625 use the old decl. */
6627 current_function_decl = pushdecl (decl1);
6630 declare_parm_level (1);
6631 current_binding_level->subblocks_tag_transparent = 1;
6633 make_function_rtl (current_function_decl);
6635 restype = TREE_TYPE (TREE_TYPE (current_function_decl));
6636 /* Promote the value to int before returning it. */
6637 if (C_PROMOTING_INTEGER_TYPE_P (restype))
6639 /* It retains unsignedness if traditional
6640 or if not really getting wider. */
6641 if (TREE_UNSIGNED (restype)
6642 && (flag_traditional
6643 || (TYPE_PRECISION (restype)
6644 == TYPE_PRECISION (integer_type_node))))
6645 restype = unsigned_type_node;
6647 restype = integer_type_node;
6649 DECL_RESULT (current_function_decl)
6650 = build_decl (RESULT_DECL, NULL_TREE, restype);
6653 /* Allocate further tree nodes temporarily during compilation
6654 of this function only. */
6655 temporary_allocation ();
6657 /* If this fcn was already referenced via a block-scope `extern' decl
6658 (or an implicit decl), propagate certain information about the usage. */
6659 if (TREE_ADDRESSABLE (DECL_ASSEMBLER_NAME (current_function_decl)))
6660 TREE_ADDRESSABLE (current_function_decl) = 1;
6662 immediate_size_expand = old_immediate_size_expand;
6667 /* Record that this function is going to be a varargs function.
6668 This is called before store_parm_decls, which is too early
6669 to call mark_varargs directly. */
6674 c_function_varargs = 1;
6677 /* Store the parameter declarations into the current function declaration.
6678 This is called after parsing the parameter declarations, before
6679 digesting the body of the function.
6681 For an old-style definition, modify the function's type
6682 to specify at least the number of arguments. */
6687 register tree fndecl = current_function_decl;
6690 /* This is either a chain of PARM_DECLs (if a prototype was used)
6691 or a list of IDENTIFIER_NODEs (for an old-fashioned C definition). */
6692 tree specparms = current_function_parms;
6694 /* This is a list of types declared among parms in a prototype. */
6695 tree parmtags = current_function_parm_tags;
6697 /* This is a chain of PARM_DECLs from old-style parm declarations. */
6698 register tree parmdecls = getdecls ();
6700 /* This is a chain of any other decls that came in among the parm
6701 declarations. If a parm is declared with enum {foo, bar} x;
6702 then CONST_DECLs for foo and bar are put here. */
6705 /* Nonzero if this definition is written with a prototype. */
6708 if (specparms != 0 && TREE_CODE (specparms) != TREE_LIST)
6710 /* This case is when the function was defined with an ANSI prototype.
6711 The parms already have decls, so we need not do anything here
6712 except record them as in effect
6713 and complain if any redundant old-style parm decls were written. */
6724 error_with_decl (fndecl,
6725 "parm types given both in parmlist and separately");
6726 /* Get rid of the erroneous decls; don't keep them on
6727 the list of parms, since they might not be PARM_DECLs. */
6728 for (decl = current_binding_level->names;
6729 decl; decl = TREE_CHAIN (decl))
6730 if (DECL_NAME (decl))
6731 IDENTIFIER_LOCAL_VALUE (DECL_NAME (decl)) = 0;
6732 for (link = current_binding_level->shadowed;
6733 link; link = TREE_CHAIN (link))
6734 IDENTIFIER_LOCAL_VALUE (TREE_PURPOSE (link)) = TREE_VALUE (link);
6735 current_binding_level->names = 0;
6736 current_binding_level->shadowed = 0;
6739 specparms = nreverse (specparms);
6740 for (parm = specparms; parm; parm = next)
6742 next = TREE_CHAIN (parm);
6743 if (TREE_CODE (parm) == PARM_DECL)
6745 if (DECL_NAME (parm) == 0)
6746 error_with_decl (parm, "parameter name omitted");
6747 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6749 error_with_decl (parm, "parameter `%s' declared void");
6750 /* Change the type to error_mark_node so this parameter
6751 will be ignored by assign_parms. */
6752 TREE_TYPE (parm) = error_mark_node;
6758 /* If we find an enum constant or a type tag,
6759 put it aside for the moment. */
6760 TREE_CHAIN (parm) = 0;
6761 others = chainon (others, parm);
6765 /* Get the decls in their original chain order
6766 and record in the function. */
6767 DECL_ARGUMENTS (fndecl) = getdecls ();
6770 /* If this function takes a variable number of arguments,
6771 add a phony parameter to the end of the parm list,
6772 to represent the position of the first unnamed argument. */
6773 if (TREE_VALUE (tree_last (TYPE_ARG_TYPES (TREE_TYPE (fndecl))))
6776 tree dummy = build_decl (PARM_DECL, NULL_TREE, void_type_node);
6777 /* Let's hope the address of the unnamed parm
6778 won't depend on its type. */
6779 TREE_TYPE (dummy) = integer_type_node;
6780 DECL_ARG_TYPE (dummy) = integer_type_node;
6781 DECL_ARGUMENTS (fndecl)
6782 = chainon (DECL_ARGUMENTS (fndecl), dummy);
6786 /* Now pushdecl the enum constants. */
6787 for (parm = others; parm; parm = next)
6789 next = TREE_CHAIN (parm);
6790 if (DECL_NAME (parm) == 0)
6792 else if (TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == void_type_node)
6794 else if (TREE_CODE (parm) != PARM_DECL)
6798 storetags (chainon (parmtags, gettags ()));
6802 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
6803 each with a parm name as the TREE_VALUE.
6805 PARMDECLS is a chain of declarations for parameters.
6806 Warning! It can also contain CONST_DECLs which are not parameters
6807 but are names of enumerators of any enum types
6808 declared among the parameters.
6810 First match each formal parameter name with its declaration.
6811 Associate decls with the names and store the decls
6812 into the TREE_PURPOSE slots. */
6814 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
6815 DECL_RESULT (parm) = 0;
6817 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
6819 register tree tail, found = NULL;
6821 if (TREE_VALUE (parm) == 0)
6823 error_with_decl (fndecl, "parameter name missing from parameter list");
6824 TREE_PURPOSE (parm) = 0;
6828 /* See if any of the parmdecls specifies this parm by name.
6829 Ignore any enumerator decls. */
6830 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
6831 if (DECL_NAME (tail) == TREE_VALUE (parm)
6832 && TREE_CODE (tail) == PARM_DECL)
6838 /* If declaration already marked, we have a duplicate name.
6839 Complain, and don't use this decl twice. */
6840 if (found && DECL_RESULT (found) != 0)
6842 error_with_decl (found, "multiple parameters named `%s'");
6846 /* If the declaration says "void", complain and ignore it. */
6847 if (found && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == void_type_node)
6849 error_with_decl (found, "parameter `%s' declared void");
6850 TREE_TYPE (found) = integer_type_node;
6851 DECL_ARG_TYPE (found) = integer_type_node;
6852 layout_decl (found, 0);
6855 /* Traditionally, a parm declared float is actually a double. */
6856 if (found && flag_traditional
6857 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
6859 TREE_TYPE (found) = double_type_node;
6860 DECL_ARG_TYPE (found) = double_type_node;
6861 layout_decl (found, 0);
6864 /* If no declaration found, default to int. */
6867 found = build_decl (PARM_DECL, TREE_VALUE (parm),
6869 DECL_ARG_TYPE (found) = TREE_TYPE (found);
6870 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
6871 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
6873 warning_with_decl (found, "type of `%s' defaults to `int'");
6877 TREE_PURPOSE (parm) = found;
6879 /* Mark this decl as "already found" -- see test, above.
6880 It is safe to use DECL_RESULT for this
6881 since it is not used in PARM_DECLs or CONST_DECLs. */
6882 DECL_RESULT (found) = error_mark_node;
6885 /* Put anything which is on the parmdecls chain and which is
6886 not a PARM_DECL onto the list NONPARMS. (The types of
6887 non-parm things which might appear on the list include
6888 enumerators and NULL-named TYPE_DECL nodes.) Complain about
6889 any actual PARM_DECLs not matched with any names. */
6892 for (parm = parmdecls; parm; )
6894 tree next = TREE_CHAIN (parm);
6895 TREE_CHAIN (parm) = 0;
6897 if (TREE_CODE (parm) != PARM_DECL)
6898 nonparms = chainon (nonparms, parm);
6901 /* Complain about args with incomplete types. */
6902 if (TYPE_SIZE (TREE_TYPE (parm)) == 0)
6904 error_with_decl (parm, "parameter `%s' has incomplete type");
6905 TREE_TYPE (parm) = error_mark_node;
6908 if (DECL_RESULT (parm) == 0)
6910 error_with_decl (parm,
6911 "declaration for parameter `%s' but no such parameter");
6912 /* Pretend the parameter was not missing.
6913 This gets us to a standard state and minimizes
6914 further error messages. */
6916 = chainon (specparms,
6917 tree_cons (parm, NULL_TREE, NULL_TREE));
6924 /* Chain the declarations together in the order of the list of names. */
6925 /* Store that chain in the function decl, replacing the list of names. */
6927 DECL_ARGUMENTS (fndecl) = 0;
6930 for (last = 0; parm; parm = TREE_CHAIN (parm))
6931 if (TREE_PURPOSE (parm))
6934 DECL_ARGUMENTS (fndecl) = TREE_PURPOSE (parm);
6936 TREE_CHAIN (last) = TREE_PURPOSE (parm);
6937 last = TREE_PURPOSE (parm);
6938 TREE_CHAIN (last) = 0;
6942 /* If there was a previous prototype,
6943 set the DECL_ARG_TYPE of each argument according to
6944 the type previously specified, and report any mismatches. */
6946 if (TYPE_ARG_TYPES (TREE_TYPE (fndecl)))
6949 for (parm = DECL_ARGUMENTS (fndecl),
6950 type = TYPE_ARG_TYPES (TREE_TYPE (fndecl));
6951 parm || (type && (TYPE_MAIN_VARIANT (TREE_VALUE (type))
6952 != void_type_node));
6953 parm = TREE_CHAIN (parm), type = TREE_CHAIN (type))
6955 if (parm == 0 || type == 0
6956 || TYPE_MAIN_VARIANT (TREE_VALUE (type)) == void_type_node)
6958 error ("number of arguments doesn't match prototype");
6959 error_with_file_and_line (current_function_prototype_file,
6960 current_function_prototype_line,
6961 "prototype declaration");
6964 /* Type for passing arg must be consistent
6965 with that declared for the arg. */
6966 if (! comptypes (DECL_ARG_TYPE (parm), TREE_VALUE (type)))
6968 if (TYPE_MAIN_VARIANT (TREE_TYPE (parm))
6969 == TYPE_MAIN_VARIANT (TREE_VALUE (type)))
6971 /* Adjust argument to match prototype. E.g. a previous
6972 `int foo(float);' prototype causes
6973 `int foo(x) float x; {...}' to be treated like
6974 `int foo(float x) {...}'. This is particularly
6975 useful for argument types like uid_t. */
6976 DECL_ARG_TYPE (parm) = TREE_TYPE (parm);
6977 #ifdef PROMOTE_PROTOTYPES
6978 if ((TREE_CODE (TREE_TYPE (parm)) == INTEGER_TYPE
6979 || TREE_CODE (TREE_TYPE (parm)) == ENUMERAL_TYPE)
6980 && TYPE_PRECISION (TREE_TYPE (parm))
6981 < TYPE_PRECISION (integer_type_node))
6982 DECL_ARG_TYPE (parm) = integer_type_node;
6986 pedwarn ("promoted argument `%s' doesn't match prototype",
6987 IDENTIFIER_POINTER (DECL_NAME (parm)));
6988 warning_with_file_and_line
6989 (current_function_prototype_file,
6990 current_function_prototype_line,
6991 "prototype declaration");
6994 /* If -traditional, allow `int' argument to match
6995 `unsigned' prototype. */
6996 else if (! (flag_traditional
6997 && TYPE_MAIN_VARIANT (TREE_TYPE (parm)) == integer_type_node
6998 && TYPE_MAIN_VARIANT (TREE_VALUE (type)) == unsigned_type_node))
7000 error ("argument `%s' doesn't match prototype",
7001 IDENTIFIER_POINTER (DECL_NAME (parm)));
7002 error_with_file_and_line (current_function_prototype_file,
7003 current_function_prototype_line,
7004 "prototype declaration");
7008 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = 0;
7011 /* Otherwise, create a prototype that would match. */
7015 tree actual = 0, last = 0, type;
7017 for (parm = DECL_ARGUMENTS (fndecl); parm; parm = TREE_CHAIN (parm))
7019 type = perm_tree_cons (NULL_TREE, DECL_ARG_TYPE (parm),
7022 TREE_CHAIN (last) = type;
7027 type = perm_tree_cons (NULL_TREE, void_type_node, NULL_TREE);
7029 TREE_CHAIN (last) = type;
7033 /* We are going to assign a new value for the TYPE_ACTUAL_ARG_TYPES
7034 of the type of this function, but we need to avoid having this
7035 affect the types of other similarly-typed functions, so we must
7036 first force the generation of an identical (but separate) type
7037 node for the relevant function type. The new node we create
7038 will be a variant of the main variant of the original function
7041 TREE_TYPE (fndecl) = build_type_copy (TREE_TYPE (fndecl));
7043 TYPE_ACTUAL_ARG_TYPES (TREE_TYPE (fndecl)) = actual;
7046 /* Now store the final chain of decls for the arguments
7047 as the decl-chain of the current lexical scope.
7048 Put the enumerators in as well, at the front so that
7049 DECL_ARGUMENTS is not modified. */
7051 storedecls (chainon (nonparms, DECL_ARGUMENTS (fndecl)));
7054 /* Make sure the binding level for the top of the function body
7055 gets a BLOCK if there are any in the function.
7056 Otherwise, the dbx output is wrong. */
7058 keep_next_if_subblocks = 1;
7060 /* ??? This might be an improvement,
7061 but needs to be thought about some more. */
7063 keep_next_level_flag = 1;
7066 /* Write a record describing this function definition to the prototypes
7067 file (if requested). */
7069 gen_aux_info_record (fndecl, 1, 0, prototype);
7071 /* Initialize the RTL code for the function. */
7073 init_function_start (fndecl, input_filename, lineno);
7075 /* If this is a varargs function, inform function.c. */
7077 if (c_function_varargs)
7080 /* Declare __FUNCTION__ and __PRETTY_FUNCTION__ for this function. */
7082 declare_function_name ();
7084 /* Set up parameters and prepare for return, for the function. */
7086 expand_function_start (fndecl, 0);
7088 /* If this function is `main', emit a call to `__main'
7089 to run global initializers, etc. */
7090 if (DECL_NAME (fndecl)
7091 && strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main") == 0
7092 && DECL_CONTEXT (fndecl) == NULL_TREE)
7093 expand_main_function ();
7096 /* SPECPARMS is an identifier list--a chain of TREE_LIST nodes
7097 each with a parm name as the TREE_VALUE. A null pointer as TREE_VALUE
7098 stands for an ellipsis in the identifier list.
7100 PARMLIST is the data returned by get_parm_info for the
7101 parmlist that follows the semicolon.
7103 We return a value of the same sort that get_parm_info returns,
7104 except that it describes the combination of identifiers and parmlist. */
7107 combine_parm_decls (specparms, parmlist, void_at_end)
7108 tree specparms, parmlist;
7111 register tree fndecl = current_function_decl;
7114 tree parmdecls = TREE_PURPOSE (parmlist);
7116 /* This is a chain of any other decls that came in among the parm
7117 declarations. They were separated already by get_parm_info,
7118 so we just need to keep them separate. */
7119 tree nonparms = TREE_VALUE (parmlist);
7123 for (parm = parmdecls; parm; parm = TREE_CHAIN (parm))
7124 DECL_RESULT (parm) = 0;
7126 for (parm = specparms; parm; parm = TREE_CHAIN (parm))
7128 register tree tail, found = NULL;
7130 /* See if any of the parmdecls specifies this parm by name. */
7131 for (tail = parmdecls; tail; tail = TREE_CHAIN (tail))
7132 if (DECL_NAME (tail) == TREE_VALUE (parm))
7138 /* If declaration already marked, we have a duplicate name.
7139 Complain, and don't use this decl twice. */
7140 if (found && DECL_RESULT (found) != 0)
7142 error_with_decl (found, "multiple parameters named `%s'");
7146 /* If the declaration says "void", complain and ignore it. */
7147 if (found && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == void_type_node)
7149 error_with_decl (found, "parameter `%s' declared void");
7150 TREE_TYPE (found) = integer_type_node;
7151 DECL_ARG_TYPE (found) = integer_type_node;
7152 layout_decl (found, 0);
7155 /* Traditionally, a parm declared float is actually a double. */
7156 if (found && flag_traditional
7157 && TYPE_MAIN_VARIANT (TREE_TYPE (found)) == float_type_node)
7159 TREE_TYPE (found) = double_type_node;
7160 DECL_ARG_TYPE (found) = double_type_node;
7161 layout_decl (found, 0);
7164 /* If no declaration found, default to int. */
7167 found = build_decl (PARM_DECL, TREE_VALUE (parm),
7169 DECL_ARG_TYPE (found) = TREE_TYPE (found);
7170 DECL_SOURCE_LINE (found) = DECL_SOURCE_LINE (fndecl);
7171 DECL_SOURCE_FILE (found) = DECL_SOURCE_FILE (fndecl);
7172 error_with_decl (found, "type of parameter `%s' is not declared");
7176 TREE_PURPOSE (parm) = found;
7178 /* Mark this decl as "already found" -- see test, above.
7179 It is safe to use DECL_RESULT for this
7180 since it is not used in PARM_DECLs or CONST_DECLs. */
7181 DECL_RESULT (found) = error_mark_node;
7184 /* Complain about any actual PARM_DECLs not matched with any names. */
7186 for (parm = parmdecls; parm; )
7188 tree next = TREE_CHAIN (parm);
7189 TREE_CHAIN (parm) = 0;
7191 /* Complain about args with incomplete types. */
7192 if (TYPE_SIZE (TREE_TYPE (parm)) == 0)
7194 error_with_decl (parm, "parameter `%s' has incomplete type");
7195 TREE_TYPE (parm) = error_mark_node;
7198 if (DECL_RESULT (parm) == 0)
7200 error_with_decl (parm,
7201 "declaration for parameter `%s' but no such parameter");
7202 /* Pretend the parameter was not missing.
7203 This gets us to a standard state and minimizes
7204 further error messages. */
7206 = chainon (specparms,
7207 tree_cons (parm, NULL_TREE, NULL_TREE));
7213 /* Chain the declarations together in the order of the list of names.
7214 At the same time, build up a list of their types, in reverse order. */
7220 for (last = 0; parm; parm = TREE_CHAIN (parm))
7221 if (TREE_PURPOSE (parm))
7224 parmdecls = TREE_PURPOSE (parm);
7226 TREE_CHAIN (last) = TREE_PURPOSE (parm);
7227 last = TREE_PURPOSE (parm);
7228 TREE_CHAIN (last) = 0;
7230 types = saveable_tree_cons (NULL_TREE, TREE_TYPE (parm), types);
7235 return saveable_tree_cons (parmdecls, nonparms,
7236 nreverse (saveable_tree_cons (NULL_TREE,
7240 return saveable_tree_cons (parmdecls, nonparms, nreverse (types));
7243 /* Finish up a function declaration and compile that function
7244 all the way to assembler language output. The free the storage
7245 for the function definition.
7247 This is called after parsing the body of the function definition.
7249 NESTED is nonzero if the function being finished is nested in another. */
7252 finish_function (nested)
7255 register tree fndecl = current_function_decl;
7257 /* TREE_READONLY (fndecl) = 1;
7258 This caused &foo to be of type ptr-to-const-function
7259 which then got a warning when stored in a ptr-to-function variable. */
7262 BLOCK_SUPERCONTEXT (DECL_INITIAL (fndecl)) = fndecl;
7264 /* Must mark the RESULT_DECL as being in this function. */
7266 DECL_CONTEXT (DECL_RESULT (fndecl)) = fndecl;
7268 /* Obey `register' declarations if `setjmp' is called in this fn. */
7269 if (flag_traditional && current_function_calls_setjmp)
7271 setjmp_protect (DECL_INITIAL (fndecl));
7272 setjmp_protect_args ();
7275 if (! strcmp (IDENTIFIER_POINTER (DECL_NAME (fndecl)), "main"))
7277 if (TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl)))
7278 != integer_type_node)
7280 /* If warn_main is 1 (-Wmain) or 2 (-Wall), we have already warned.
7281 If warn_main is -1 (-Wno-main) we don't want to be warned. */
7283 pedwarn_with_decl (fndecl, "return type of `%s' is not `int'");
7287 #ifdef DEFAULT_MAIN_RETURN
7288 /* Make it so that `main' always returns success by default. */
7289 DEFAULT_MAIN_RETURN;
7294 /* Generate rtl for function exit. */
7295 expand_function_end (input_filename, lineno, 0);
7297 /* So we can tell if jump_optimize sets it to 1. */
7300 /* Run the optimizers and output the assembler code for this function. */
7301 rest_of_compilation (fndecl);
7303 current_function_returns_null |= can_reach_end;
7305 if (warn_missing_noreturn
7306 && !TREE_THIS_VOLATILE (fndecl)
7307 && !current_function_returns_null
7308 && !current_function_returns_value)
7309 warning ("function might be possible candidate for attribute `noreturn'");
7311 if (TREE_THIS_VOLATILE (fndecl) && current_function_returns_null)
7312 warning ("`noreturn' function does return");
7313 else if (warn_return_type && can_reach_end
7314 && TYPE_MAIN_VARIANT (TREE_TYPE (TREE_TYPE (fndecl))) != void_type_node)
7315 /* If this function returns non-void and control can drop through,
7317 warning ("control reaches end of non-void function");
7318 /* With just -W, complain only if function returns both with
7319 and without a value. */
7320 else if (extra_warnings
7321 && current_function_returns_value && current_function_returns_null)
7322 warning ("this function may return with or without a value");
7324 /* If requested, warn about function definitions where the function will
7325 return a value (usually of some struct or union type) which itself will
7326 take up a lot of stack space. */
7328 if (warn_larger_than && !DECL_EXTERNAL (fndecl) && TREE_TYPE (fndecl))
7330 register tree ret_type = TREE_TYPE (TREE_TYPE (fndecl));
7334 register tree ret_type_size = TYPE_SIZE (ret_type);
7336 if (TREE_CODE (ret_type_size) == INTEGER_CST)
7339 = TREE_INT_CST_LOW (ret_type_size) / BITS_PER_UNIT;
7341 if (units > larger_than_size)
7342 warning_with_decl (fndecl,
7343 "size of return value of `%s' is %u bytes",
7349 /* Free all the tree nodes making up this function. */
7350 /* Switch back to allocating nodes permanently
7351 until we start another function. */
7353 permanent_allocation (1);
7355 if (DECL_SAVED_INSNS (fndecl) == 0 && ! nested)
7357 /* Stop pointing to the local nodes about to be freed. */
7358 /* But DECL_INITIAL must remain nonzero so we know this
7359 was an actual function definition. */
7360 /* For a nested function, this is done in pop_c_function_context. */
7361 /* If rest_of_compilation set this to 0, leave it 0. */
7362 if (DECL_INITIAL (fndecl) != 0)
7363 DECL_INITIAL (fndecl) = error_mark_node;
7364 DECL_ARGUMENTS (fndecl) = 0;
7367 if (DECL_STATIC_CONSTRUCTOR (fndecl))
7369 #ifndef ASM_OUTPUT_CONSTRUCTOR
7370 if (! flag_gnu_linker)
7371 static_ctors = perm_tree_cons (NULL_TREE, fndecl, static_ctors);
7374 assemble_constructor (IDENTIFIER_POINTER (DECL_NAME (fndecl)));
7376 if (DECL_STATIC_DESTRUCTOR (fndecl))
7378 #ifndef ASM_OUTPUT_DESTRUCTOR
7379 if (! flag_gnu_linker)
7380 static_dtors = perm_tree_cons (NULL_TREE, fndecl, static_dtors);
7383 assemble_destructor (IDENTIFIER_POINTER (DECL_NAME (fndecl)));
7388 /* Let the error reporting routines know that we're outside a
7389 function. For a nested function, this value is used in
7390 pop_c_function_context and then reset via pop_function_context. */
7391 current_function_decl = NULL;
7395 /* Save and restore the variables in this file and elsewhere
7396 that keep track of the progress of compilation of the current function.
7397 Used for nested functions. */
7401 struct c_function *next;
7403 tree shadowed_labels;
7406 int warn_about_return_type;
7408 struct binding_level *binding_level;
7411 struct c_function *c_function_chain;
7413 /* Save and reinitialize the variables
7414 used during compilation of a C function. */
7417 push_c_function_context ()
7419 struct c_function *p
7420 = (struct c_function *) xmalloc (sizeof (struct c_function));
7423 pedwarn ("ANSI C forbids nested functions");
7425 push_function_context ();
7427 p->next = c_function_chain;
7428 c_function_chain = p;
7430 p->named_labels = named_labels;
7431 p->shadowed_labels = shadowed_labels;
7432 p->returns_value = current_function_returns_value;
7433 p->returns_null = current_function_returns_null;
7434 p->warn_about_return_type = warn_about_return_type;
7435 p->extern_inline = current_extern_inline;
7436 p->binding_level = current_binding_level;
7439 /* Restore the variables used during compilation of a C function. */
7442 pop_c_function_context ()
7444 struct c_function *p = c_function_chain;
7447 /* Bring back all the labels that were shadowed. */
7448 for (link = shadowed_labels; link; link = TREE_CHAIN (link))
7449 if (DECL_NAME (TREE_VALUE (link)) != 0)
7450 IDENTIFIER_LABEL_VALUE (DECL_NAME (TREE_VALUE (link)))
7451 = TREE_VALUE (link);
7453 if (DECL_SAVED_INSNS (current_function_decl) == 0)
7455 /* Stop pointing to the local nodes about to be freed. */
7456 /* But DECL_INITIAL must remain nonzero so we know this
7457 was an actual function definition. */
7458 DECL_INITIAL (current_function_decl) = error_mark_node;
7459 DECL_ARGUMENTS (current_function_decl) = 0;
7462 pop_function_context ();
7464 c_function_chain = p->next;
7466 named_labels = p->named_labels;
7467 shadowed_labels = p->shadowed_labels;
7468 current_function_returns_value = p->returns_value;
7469 current_function_returns_null = p->returns_null;
7470 warn_about_return_type = p->warn_about_return_type;
7471 current_extern_inline = p->extern_inline;
7472 current_binding_level = p->binding_level;
7477 /* integrate_decl_tree calls this function, but since we don't use the
7478 DECL_LANG_SPECIFIC field, this is a no-op. */
7481 copy_lang_decl (node)
7482 tree node ATTRIBUTE_UNUSED;