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/* A simple, memory-efficient bitset implementation.
Copyright (C) 2009 Free Software Foundation, Inc.
This file is part of Bison, the GNU Compiler Compiler.
This program 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 3 of the License, or
(at your option) any later version.
This program 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 this program. If not, see <http://www.gnu.org/licenses/>. */
#include <config.h>
#include "system.h"
#include "Sbitset.h"
Sbitset
Sbitset__new (Sbitset__Index nbits)
{
/* Some functions, like Sbitset__last_byte_mask, will fail if nbits = 0. */
aver (nbits);
return xcalloc (1, Sbitset__nbytes (nbits));
}
Sbitset
Sbitset__new_on_obstack (Sbitset__Index nbits, struct obstack *obstackp)
{
char *result;
char *ptr;
char *end;
aver (nbits);
result = obstack_alloc (obstackp, Sbitset__nbytes (nbits));
for (ptr = result, end = result + Sbitset__nbytes (nbits); ptr < end; ++ptr)
*ptr = 0;
return result;
}
void
Sbitset__delete (Sbitset self)
{
free (self);
}
bool
Sbitset__isEmpty (Sbitset self, Sbitset__Index nbits)
{
char *last = self + Sbitset__nbytes (nbits) - 1;
for (; self < last; ++self)
if (*self != 0)
return false;
return ((*last) & Sbitset__last_byte_mask (nbits)) == 0;
}
void
Sbitset__fprint(Sbitset self, Sbitset__Index nbits, FILE *file)
{
Sbitset__Index i;
Sbitset itr;
bool first = true;
fprintf (file, "nbits = %d, set = {", nbits);
SBITSET__FOR_EACH (self, nbits, itr, i)
{
if (first)
first = false;
else
fprintf (file, ",");
fprintf (file, " %d", i);
}
fprintf (file, " }");
}
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