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* src/nullable.h: New file.

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Propagate its inclusion.
* src/nullable.c: Formatting changes.
This commit is contained in:
Akim Demaille
2000-10-02 08:06:43 +00:00
parent 85bcaacc59
commit 3519ec76a3
7 changed files with 80 additions and 47 deletions
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75
src/nullable.c
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@@ -1,48 +1,45 @@
/* Part of the bison parser generator,
Copyright (C) 1984, 1989 Free Software Foundation, Inc.
Copyright (C) 1984, 1989, 2000 Free Software Foundation, Inc.
This file is part of Bison, the GNU Compiler Compiler.
This file is part of Bison, the GNU Compiler Compiler.
Bison is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
Bison is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
Bison is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
Bison is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Bison; see the file COPYING. If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
You should have received a copy of the GNU General Public License
along with Bison; see the file COPYING. If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
/* set up nullable, a vector saying which nonterminals can expand into
the null string. nullable[i - ntokens] is nonzero if symbol i can
/* Set up NULLABLE, a vector saying which nonterminals can expand into
the null string. NULLABLE[I - NTOKENS] is nonzero if symbol I can
do so. */
#include "system.h"
#include "types.h"
#include "gram.h"
#include "alloc.h"
#include "nullable.h"
char *nullable;
extern void free_nullable PARAMS((void));
extern void set_nullable PARAMS((void));
char *nullable = NULL;
void
set_nullable (void)
{
register short *r;
register short *s1;
register short *s2;
register int ruleno;
register int symbol;
register shorts *p;
short *r;
short *s1;
short *s2;
int ruleno;
int symbol;
shorts *p;
short *squeue;
short *rcount;
@@ -52,20 +49,20 @@ set_nullable (void)
short *r1;
#ifdef TRACE
fprintf(stderr, _("Entering set_nullable"));
fprintf (stderr, _("Entering set_nullable"));
#endif
nullable = NEW2(nvars, char) - ntokens;
nullable = NEW2 (nvars, char) - ntokens;
squeue = NEW2(nvars, short);
squeue = NEW2 (nvars, short);
s1 = s2 = squeue;
rcount = NEW2(nrules + 1, short);
rsets = NEW2(nvars, shorts *) - ntokens;
rcount = NEW2 (nrules + 1, short);
rsets = NEW2 (nvars, shorts *) - ntokens;
/* This is said to be more elements than we actually use.
Supposedly nitems - nrules is enough.
But why take the risk? */
relts = NEW2(nitems + nvars + 1, shorts);
relts = NEW2 (nitems + nvars + 1, shorts);
p = relts;
r = ritem;
@@ -86,7 +83,7 @@ set_nullable (void)
any_tokens = 0;
for (symbol = *r++; symbol > 0; symbol = *r++)
{
if (ISTOKEN(symbol))
if (ISTOKEN (symbol))
any_tokens = 1;
}
@@ -125,15 +122,15 @@ set_nullable (void)
}
}
FREE(squeue);
FREE(rcount);
FREE(rsets + ntokens);
FREE(relts);
FREE (squeue);
FREE (rcount);
FREE (rsets + ntokens);
FREE (relts);
}
void
free_nullable (void)
{
FREE(nullable + ntokens);
FREE (nullable + ntokens);
}