* lib/bitset-int.h, lib/bitset.c, lib/bitset.h, lib/bitsetv.c,

[bison.git] / lib / lbitset.h

diff --git a/lib/lbitset.h b/lib/lbitset.h
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+++ b/lib/lbitset.h
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+/* Functions to support lbitsets.
+   Copyright (C) 2002 Free Software Foundation, Inc.
+   Contributed by Michael Hayes (m.hayes@elec.canterbury.ac.nz).
+
+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 2 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, write to the Free Software
+Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+
+#ifndef _LBITSET_H
+#define _LBITSET_H
+
+#include "bitset-int.h"
+
+/* Number of words to use for each element.  The larger the value the
+   greater the size of the cache and the shorter the time to find a given bit
+   but the more memory wasted for sparse bitsets and the longer the time
+   to search for set bits.  */
+#ifndef LBITSET_ELT_WORDS
+#define LBITSET_ELT_WORDS 2
+#endif
+
+typedef bitset_word lbitset_word;
+#define LBITSET_WORD_BITS BITSET_WORD_BITS
+
+/* Number of bits stored in each element.  */
+#define LBITSET_ELT_BITS \
+  ((unsigned) (LBITSET_ELT_WORDS * LBITSET_WORD_BITS))
+
+/* Lbitset element.   We use an array of bits for each element.
+   These are linked together in a doubly-linked list.  */
+typedef struct lbitset_elt_struct
+{
+  struct lbitset_elt_struct *next; /* Next element.  */
+  struct lbitset_elt_struct *prev; /* Previous element.  */
+  bitset_windex index;         /* bitno / BITSET_WORD_BITS.  */
+  bitset_word words[LBITSET_ELT_WORDS]; /* Bits that are set.  */
+} lbitset_elt;
+
+
+/* Head of lbitset linked list.  */
+typedef struct lbitset_struct
+{
+  lbitset_elt *head;           /* First element in linked list.  */
+  lbitset_elt *tail;           /* Last element in linked list.  */
+} *lbitset;
+
+
+extern int lbitset_bytes PARAMS ((bitset_bindex));
+
+extern void lbitset_release_memory PARAMS ((void));
+
+#endif