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81 lines
2.1 KiB
C
81 lines
2.1 KiB
C
/* A simple, memory-efficient bitset implementation.
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Copyright (C) 2009-2015, 2018-2020 Free Software Foundation, Inc.
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This file is part of Bison, the GNU Compiler Compiler.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include <config.h>
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#include "system.h"
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#include "Sbitset.h"
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Sbitset
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Sbitset__new (Sbitset__Index nbits)
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{
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/* Some functions, like Sbitset__last_byte_mask, will fail if nbits = 0. */
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aver (nbits);
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return xcalloc (1, Sbitset__nbytes (nbits));
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}
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Sbitset
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Sbitset__new_on_obstack (Sbitset__Index nbits, struct obstack *obstackp)
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{
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Sbitset result;
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Sbitset ptr;
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Sbitset end;
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aver (nbits);
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result = obstack_alloc (obstackp, Sbitset__nbytes (nbits));
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for (ptr = result, end = result + Sbitset__nbytes (nbits); ptr < end; ++ptr)
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*ptr = 0;
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return result;
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}
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void
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Sbitset__delete (Sbitset self)
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{
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free (self);
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}
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bool
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Sbitset__isEmpty (Sbitset self, Sbitset__Index nbits)
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{
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Sbitset last = self + Sbitset__nbytes (nbits) - 1;
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for (; self < last; ++self)
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if (*self != 0)
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return false;
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return ((*last) & Sbitset__last_byte_mask (nbits)) == 0;
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}
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void
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Sbitset__fprint (Sbitset self, Sbitset__Index nbits, FILE *file)
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{
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Sbitset__Index i;
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Sbitset itr;
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bool first = true;
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fprintf (file,
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"nbits = %" SBITSET__INDEX__CONVERSION_SPEC ", set = {",
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nbits);
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SBITSET__FOR_EACH (self, nbits, itr, i)
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{
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if (first)
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first = false;
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else
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fprintf (file, ",");
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fprintf (file, " %" SBITSET__INDEX__CONVERSION_SPEC, i);
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}
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fprintf (file, " }");
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}
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