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/* Generic bitsets.
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 _BITSET_H
#define _BITSET_H
/* This file is the public interface to the bitset abstract data type.
Only use the functions and macros defined in this file. */
#include "bbitset.h"
#include "obstack.h"
#include <stdio.h>
/* Attributes used to select a bitset implementation. */
enum bitset_attr {BITSET_FIXED = 1, /* Bitset size fixed. */
BITSET_VARIABLE = 2, /* Bitset size variable. */
BITSET_DENSE = 4, /* Bitset dense. */
BITSET_SPARSE = 8, /* Bitset sparse. */
BITSET_FRUGAL = 16, /* Prefer most compact. */
BITSET_GREEDY = 32}; /* Prefer fastest. */
typedef unsigned int bitset_attrs;
/* The contents of the structure should be considered to be private.
While I would like to make this structure opaque, it needs to be
visible for the inline bit set/test functions. */
struct bitset_struct
{
struct bbitset_struct b;
};
/* Return bytes required for bitset of desired type and size. */
extern int bitset_bytes PARAMS ((enum bitset_type, bitset_bindex));
/* Initialise a bitset with desired type and size. */
extern bitset bitset_init PARAMS ((bitset, bitset_bindex, enum bitset_type));
/* Select an implementation type based on the desired bitset size
and attributes. */
extern enum bitset_type bitset_type_choose PARAMS ((bitset_bindex,
bitset_attrs));
/* Create a bitset of desired type and size. The bitset is zeroed. */
extern bitset bitset_alloc PARAMS ((bitset_bindex, enum bitset_type));
/* Free bitset. */
extern void bitset_free PARAMS ((bitset));
/* Create a bitset of desired type and size using an obstack. The
bitset is zeroed. */
extern bitset bitset_obstack_alloc PARAMS ((struct obstack *bobstack,
bitset_bindex, enum bitset_type));
/* Free bitset allocated on obstack. */
extern void bitset_obstack_free PARAMS ((bitset));
/* Create a bitset of desired size and attributes. The bitset is zeroed. */
extern bitset bitset_create PARAMS ((bitset_bindex, bitset_attrs));
/* Return size in bits of bitset SRC. */
extern int bitset_size PARAMS ((bitset));
/* Return number of bits set in bitset SRC. */
extern int bitset_count PARAMS ((bitset));
#if BITSET_CACHE && BITSET_INLINE
static inline void bitset_set PARAMS ((bitset, bitset_bindex));
static inline void bitset_reset PARAMS ((bitset, bitset_bindex));
static inline int bitset_test PARAMS ((bitset, bitset_bindex));
/* Set bit BITNO in bitset BSET. */
static inline void bitset_set (bset, bitno)
bitset bset;
bitset_bindex bitno;
{
bitset_windex index = bitno / BITSET_WORD_BITS;
bitset_windex offset = index - bset->b.cindex;
if (offset < bset->b.csize)
bset->b.cdata[offset] |= (1 << (bitno % BITSET_WORD_BITS));
else
BITSET_SET_ (bset, bitno);
}
/* Reset bit BITNO in bitset BSET. */
static inline void bitset_reset (bset, bitno)
bitset bset;
bitset_bindex bitno;
{
bitset_windex index = bitno / BITSET_WORD_BITS;
bitset_windex offset = index - bset->b.cindex;
if (offset < bset->b.csize)
bset->b.cdata[offset] &= ~(1 << (bitno % BITSET_WORD_BITS));
else
BITSET_RESET_ (bset, bitno);
}
/* Test bit BITNO in bitset BSET. */
static inline int bitset_test (bset, bitno)
bitset bset;
bitset_bindex bitno;
{
bitset_windex index = bitno / BITSET_WORD_BITS;
bitset_windex offset = index - bset->b.cindex;
if (offset < bset->b.csize)
return (bset->b.cdata[offset] >> (bitno % BITSET_WORD_BITS)) & 1;
else
return BITSET_TEST_ (bset, bitno);
}
#endif
#if BITSET_CACHE && ! BITSET_INLINE
/* Set bit BITNO in bitset BSET. */
#define bitset_set(bset, bitno) \
do \
{ \
bitset_bindex _bitno = (bitno); \
bitset_windex _index = _bitno / BITSET_WORD_BITS; \
bitset_windex _offset = _index - (bset)->b.cindex; \
\
if (_offset < (bset)->b.csize) \
(bset)->b.cdata[_offset] |= (1 << (_bitno % BITSET_WORD_BITS)); \
else \
BITSET_SET_ ((bset), _bitno); \
} while (0)
/* Reset bit BITNO in bitset BSET. */
#define bitset_reset(bset, bitno) \
do \
{ \
bitset_bindex _bitno = (bitno); \
bitset_windex _index = _bitno / BITSET_WORD_BITS; \
bitset_windex _offset = _index - (bset)->b.cindex; \
\
if (_offset < (bset)->b.csize) \
(bset)->b.cdata[_offset] &= ~(1 << (_bitno % BITSET_WORD_BITS)); \
else \
BITSET_RESET_ ((bset), _bitno); \
} while (0)
/* Test bit BITNO in bitset BSET. */
#define bitset_test(bset, bitno) \
(((((bitno) / BITSET_WORD_BITS) - (bset)->b.cindex) < (bset)->b.csize) \
? ((bset)->b.cdata[(((bitno) / BITSET_WORD_BITS) - (bset)->b.cindex)] \
>> ((bitno) % BITSET_WORD_BITS)) & 1 \
: (unsigned int) BITSET_TEST_ ((bset), (bitno)))
#endif
#if ! BITSET_CACHE
/* Set bit BITNO in bitset SRC. */
#define bitset_set(SRC, BITNO) BITSET_SET_ (SRC, BITNO)
/* Reset bit BITNO in bitset SRC. */
#define bitset_reset(SRC, BITNO) BITSET_RESET_ (SRC, BITNO)
/* Return non-zero if bit BITNO in bitset SRC is set. */
#define bitset_test(SRC, BITNO) BITSET_TEST_ (SRC, BITNO)
#endif
/* DST = 0. */
extern int bitset_zero PARAMS ((bitset));
/* DST = ~0. */
extern int bitset_ones PARAMS ((bitset));
/* Return non-zero if all bits in bitset SRC are reset. */
extern int bitset_empty_p PARAMS ((bitset));
/* Return DST == DST | SRC. */
extern int bitset_subset_p PARAMS ((bitset, bitset));
/* Return DST == SRC. */
extern int bitset_equal_p PARAMS ((bitset, bitset));
/* Return DST & SRC == 0. */
extern int bitset_disjoint_p PARAMS ((bitset, bitset));
/* DST == SRC. */
extern int bitset_copy PARAMS ((bitset, bitset));
/* DST = ~SRC. */
extern int bitset_not PARAMS ((bitset, bitset));
/* DST = SRC1 | SRC2. Return non-zero if DST != SRC1 | SRC2. */
extern int bitset_or PARAMS ((bitset, bitset, bitset));
/* DST = SRC1 & SRC2. Return non-zero if DST != SRC1 & SRC2. */
extern int bitset_and PARAMS ((bitset, bitset, bitset));
/* DST = SRC1 ^ SRC2. Return non-zero if DST != SRC1 ^ SRC2. */
extern int bitset_xor PARAMS ((bitset, bitset, bitset));
/* DST = SRC1 & ~SRC2. Return non-zero if DST != SRC1 & ~SRC2. */
extern int bitset_andn PARAMS ((bitset, bitset, bitset));
/* DST = SRC1 | ~SRC2. Return non-zero if DST != SRC1 | ~SRC2. */
extern int bitset_orn PARAMS ((bitset, bitset, bitset));
/* DST = (SRC1 | SRC2) & SRC3. Return non-zero if
DST != (SRC1 | SRC2) & SRC3. */
extern int bitset_or_and PARAMS ((bitset, bitset, bitset, bitset));
/* DST = (SRC1 & SRC2) | SRC3. Return non-zero if
DST != (SRC1 & SRC2) | SRC3. */
extern int bitset_and_or PARAMS ((bitset, bitset, bitset, bitset));
/* DST = (SRC1 & ~SRC2) | SRC3. Return non-zero if
DST != (SRC1 & ~SRC2) | SRC3. */
extern int bitset_andn_or PARAMS ((bitset, bitset, bitset, bitset));
/* Find next bit set in BSET starting from and including BITNO. */
extern int bitset_next PARAMS ((bitset, bitset_bindex));
/* Find previous bit set in BSET starting from and including BITNO. */
extern int bitset_prev PARAMS ((bitset, bitset_bindex));
/* Find list of up to NUM bits set in BSET starting from and including
*NEXT. Return with actual number of bits found and with *NEXT
indicating where search stopped. */
#if BITSET_STATS
extern int bitset_list PARAMS ((bitset, bitset_bindex *, bitset_bindex,
bitset_bindex *));
#else
#define bitset_list(BSET, LIST, NUM, NEXT) \
BITSET_LIST_ (BSET, LIST, NUM, NEXT)
#endif
/* Find reverse list of up to NUM bits set in BSET starting from and
including NEXT. Return with actual number of bits found and with
*NEXT indicating where search stopped. */
#define bitset_reverse_list(BSET, LIST, NUM, NEXT) \
BITSET_REVERSE_LIST_ (BSET, LIST, NUM, NEXT)
/* Find first set bit. */
extern int bitset_first PARAMS ((bitset));
/* Find last set bit. */
extern int bitset_last PARAMS ((bitset));
/* Dump bitset. */
extern void bitset_dump PARAMS ((FILE *, bitset));
/* Loop over all elements of BSET, starting with MIN, executing CODE. */
#define BITSET_EXECUTE(BSET, MIN, N, CODE) \
do { \
bitset_bindex _list[BITSET_LIST_SIZE]; \
bitset_bindex _next = (MIN); \
int _num; \
\
while ((_num = bitset_list ((BSET), _list, BITSET_LIST_SIZE, &_next)))\
{ \
int _i; \
\
for (_i = 0; _i < _num; _i++) \
{ \
(N) = _list[_i]; \
CODE; \
} \
if (_num < BITSET_LIST_SIZE) \
break; \
} \
} while (0)
/* Loop over all elements of BSET, in reverse order starting with
MIN, executing CODE. */
#define BITSET_REVERSE_EXECUTE(BSET, MIN, N, CODE) \
do { \
bitset_bindex _list[BITSET_LIST_SIZE]; \
bitset_bindex _next = (MIN); \
int _num; \
\
while ((_num = bitset_reverse_list ((BSET), _list, \
BITSET_LIST_SIZE, &_next))) \
{ \
int _i; \
\
for (_i = 0; _i < _num; _i++) \
{ \
(N) = _list[_i]; \
CODE; \
} \
if (_num < BITSET_LIST_SIZE) \
break; \
} \
} while (0)
/* Define set operations in terms of logical operations. */
#define bitset_diff(DST, SRC1, SRC2) bitset_andn (DST, SRC1, SRC2)
#define bitset_intersection(DST, SRC1, SRC2) bitset_and (DST, SRC1, SRC2)
#define bitset_union(DST, SRC1, SRC2) bitset_or (DST, SRC1, SRC2)
#define bitset_diff_union(DST, SRC1, SRC2, SRC3) \
bitset_andn_or (DST, SRC1, SRC2, SRC3)
/* Release any memory tied up with bitsets. */
extern void bitset_release_memory PARAMS ((void));
/* Initialise bitset stats. */
extern void bitset_stats_init PARAMS ((void));
/* Dump bitset stats. */
extern void bitset_stats_dump PARAMS ((FILE *));
/* Function to debug bitset from debugger. */
extern void debug_bitset PARAMS ((bitset));
/* Function to debug bitset stats from debugger. */
extern void debug_bitset_stats PARAMS ((void));
#endif /* _BITSET_H */
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