1/* A simple, memory-efficient bitset implementation.
2
3   Copyright (C) 2009-2012 Free Software Foundation, Inc.
4
5   This file is part of Bison, the GNU Compiler Compiler.
6
7   This program 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 3 of the License, or
10   (at your option) any later version.
11
12   This program 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.
16
17   You should have received a copy of the GNU General Public License
18   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
19
20#include <config.h>
21#include "system.h"
22
23#include "Sbitset.h"
24
25Sbitset
26Sbitset__new (Sbitset__Index nbits)
27{
28  /* Some functions, like Sbitset__last_byte_mask, will fail if nbits = 0.  */
29  aver (nbits);
30  return xcalloc (1, Sbitset__nbytes (nbits));
31}
32
33Sbitset
34Sbitset__new_on_obstack (Sbitset__Index nbits, struct obstack *obstackp)
35{
36  Sbitset result;
37  Sbitset ptr;
38  Sbitset end;
39  aver (nbits);
40  result = obstack_alloc (obstackp, Sbitset__nbytes (nbits));
41  for (ptr = result, end = result + Sbitset__nbytes (nbits); ptr < end; ++ptr)
42    *ptr = 0;
43  return result;
44}
45
46void
47Sbitset__delete (Sbitset self)
48{
49  free (self);
50}
51
52bool
53Sbitset__isEmpty (Sbitset self, Sbitset__Index nbits)
54{
55  Sbitset last = self + Sbitset__nbytes (nbits) - 1;
56  for (; self < last; ++self)
57    if (*self != 0)
58      return false;
59  return ((*last) & Sbitset__last_byte_mask (nbits)) == 0;
60}
61
62void
63Sbitset__fprint(Sbitset self, Sbitset__Index nbits, FILE *file)
64{
65  Sbitset__Index i;
66  Sbitset itr;
67  bool first = true;
68  fprintf (file,
69           "nbits = %" SBITSET__INDEX__CONVERSION_SPEC ", set = {",
70           nbits);
71  SBITSET__FOR_EACH (self, nbits, itr, i)
72    {
73      if (first)
74        first = false;
75      else
76        fprintf (file, ",");
77      fprintf (file, " %" SBITSET__INDEX__CONVERSION_SPEC, i);
78    }
79  fprintf (file, " }");
80}
81