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423 lines
13 KiB
C
423 lines
13 KiB
C
/* Generic bitsets.
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Copyright (C) 2002 Free Software Foundation, Inc.
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Contributed by Michael Hayes (m.hayes@elec.canterbury.ac.nz).
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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 2 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, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#ifndef _BITSET_H
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#define _BITSET_H
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/* This file is the public interface to the bitset abstract data type.
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Only use the functions and macros defined in this file. */
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#include "bbitset.h"
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#include "obstack.h"
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#include <stdio.h>
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/* Attributes used to select a bitset implementation. */
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enum bitset_attr {BITSET_FIXED = 1, /* Bitset size fixed. */
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BITSET_VARIABLE = 2, /* Bitset size variable. */
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BITSET_DENSE = 4, /* Bitset dense. */
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BITSET_SPARSE = 8, /* Bitset sparse. */
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BITSET_FRUGAL = 16, /* Prefer most compact. */
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BITSET_GREEDY = 32}; /* Prefer fastest at memory expense. */
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typedef unsigned int bitset_attrs;
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/* The contents of the union should be considered to be private.
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While I would like to make this union opaque, it needs to be
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visible for the inline bit set/test functions, and for delegation
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to the proper implementation. */
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union bitset_union
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{
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/* This must be the first member of every other structure that is a
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member of this union. */
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struct bbitset_struct b;
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struct abitset_struct
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{
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struct bbitset_struct b;
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bitset_bindex n_bits; /* Number of bits. */
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bitset_word words[1]; /* The array of bits. */
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} a;
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struct ebitset_struct
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{
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struct bbitset_struct b;
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bitset_windex size; /* Number of elements. */
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struct ebitset_elt_struct **elts; /* Expanding array of ptrs to elts. */
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} e;
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struct lbitset_struct
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{
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struct bbitset_struct b;
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struct lbitset_elt_struct *head; /* First element in linked list. */
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struct lbitset_elt_struct *tail; /* Last element in linked list. */
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} l;
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struct bitset_stats_struct
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{
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struct bbitset_struct b;
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bitset bset;
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} s;
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};
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/* The contents of this structure should be considered private.
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It is used for iterating over set bits. */
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typedef struct
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{
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bitset_bindex list[BITSET_LIST_SIZE];
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bitset_bindex next;
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bitset_bindex num;
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bitset_bindex i;
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} bitset_iterator;
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/* Return bytes required for bitset of desired type and size. */
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extern size_t bitset_bytes PARAMS ((enum bitset_type, bitset_bindex));
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/* Initialise a bitset with desired type and size. */
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extern bitset bitset_init PARAMS ((bitset, bitset_bindex, enum bitset_type));
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/* Select an implementation type based on the desired bitset size
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and attributes. */
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extern enum bitset_type bitset_type_choose PARAMS ((bitset_bindex,
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bitset_attrs));
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/* Create a bitset of desired type and size. The bitset is zeroed. */
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extern bitset bitset_alloc PARAMS ((bitset_bindex, enum bitset_type));
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/* Free bitset. */
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extern void bitset_free PARAMS ((bitset));
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/* Create a bitset of desired type and size using an obstack. The
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bitset is zeroed. */
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extern bitset bitset_obstack_alloc PARAMS ((struct obstack *bobstack,
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bitset_bindex, enum bitset_type));
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/* Free bitset allocated on obstack. */
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extern void bitset_obstack_free PARAMS ((bitset));
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/* Create a bitset of desired size and attributes. The bitset is zeroed. */
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extern bitset bitset_create PARAMS ((bitset_bindex, bitset_attrs));
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/* Return bitset type. */
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extern enum bitset_type bitset_type_get PARAMS ((bitset));
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/* Return bitset type name. */
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extern const char *bitset_type_name_get PARAMS ((bitset));
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#if BITSET_INLINE
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/* Set bit BITNO in bitset BSET. */
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static inline void
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bitset_set (bitset bset, bitset_bindex bitno)
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{
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bitset_windex index = bitno / BITSET_WORD_BITS;
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bitset_windex offset = index - bset->b.cindex;
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if (offset < bset->b.csize)
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bset->b.cdata[offset] |= ((bitset_word) 1 << (bitno % BITSET_WORD_BITS));
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else
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BITSET_SET_ (bset, bitno);
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}
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/* Reset bit BITNO in bitset BSET. */
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static inline void
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bitset_reset (bitset bset, bitset_bindex bitno)
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{
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bitset_windex index = bitno / BITSET_WORD_BITS;
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bitset_windex offset = index - bset->b.cindex;
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if (offset < bset->b.csize)
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bset->b.cdata[offset] &= ~((bitset_word) 1 << (bitno % BITSET_WORD_BITS));
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else
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BITSET_RESET_ (bset, bitno);
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}
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/* Test bit BITNO in bitset BSET. */
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static inline int
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bitset_test (bitset bset, bitset_bindex bitno)
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{
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bitset_windex index = bitno / BITSET_WORD_BITS;
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bitset_windex offset = index - bset->b.cindex;
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if (offset < bset->b.csize)
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return (bset->b.cdata[offset] >> (bitno % BITSET_WORD_BITS)) & 1;
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else
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return BITSET_TEST_ (bset, bitno);
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}
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#endif
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#if ! BITSET_INLINE
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/* Set bit BITNO in bitset BSET. */
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#define bitset_set(bset, bitno) \
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do \
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{ \
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bitset_bindex _bitno = (bitno); \
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bitset_windex _index = _bitno / BITSET_WORD_BITS; \
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bitset_windex _offset = _index - (bset)->b.cindex; \
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\
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if (_offset < (bset)->b.csize) \
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(bset)->b.cdata[_offset] |= \
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((bitset_word) 1 << (_bitno % BITSET_WORD_BITS)); \
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else \
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BITSET_SET_ ((bset), _bitno); \
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} while (0)
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/* Reset bit BITNO in bitset BSET. */
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#define bitset_reset(bset, bitno) \
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do \
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{ \
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bitset_bindex _bitno = (bitno); \
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bitset_windex _index = _bitno / BITSET_WORD_BITS; \
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bitset_windex _offset = _index - (bset)->b.cindex; \
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\
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if (_offset < (bset)->b.csize) \
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(bset)->b.cdata[_offset] &= \
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~((bitset_word) 1 << (_bitno % BITSET_WORD_BITS)); \
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else \
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BITSET_RESET_ ((bset), _bitno); \
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} while (0)
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/* Test bit BITNO in bitset BSET. */
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#define bitset_test(bset, bitno) \
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(((((bitno) / BITSET_WORD_BITS) - (bset)->b.cindex) < (bset)->b.csize) \
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? ((bset)->b.cdata[(((bitno) / BITSET_WORD_BITS) - (bset)->b.cindex)] \
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>> ((bitno) % BITSET_WORD_BITS)) & 1 \
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: (unsigned int) BITSET_TEST_ ((bset), (bitno)))
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#endif
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/* Toggle bit BITNO in bitset BSET and return non-zero if now set. */
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#define bitset_toggle(bset, bitno) BITSET_TOGGLE_ (bset, bitno)
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/* Return size in bits of bitset SRC. */
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#define bitset_size(SRC) BITSET_SIZE_ (SRC)
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/* Return number of bits set in bitset SRC. */
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#define bitset_count(SRC) BITSET_COUNT_ (SRC)
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/* Return SRC == 0. */
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#define bitset_empty_p(SRC) BITSET_EMPTY_P_ (SRC)
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/* DST = ~0. */
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#define bitset_ones(DST) BITSET_ONES_ (DST)
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/* DST = 0. */
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#define bitset_zero(DST) BITSET_ZERO_ (DST)
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/* DST = SRC. */
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#define bitset_copy(DST, SRC) BITSET_COPY_ (DST, SRC)
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/* Return DST & SRC == 0. */
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#define bitset_disjoint_p(DST, SRC) BITSET_DISJOINT_P_ (DST, SRC)
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/* Return DST == SRC. */
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#define bitset_equal_p(DST, SRC) BITSET_EQUAL_P_ (DST, SRC)
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/* DST = ~SRC. */
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#define bitset_not(DST, SRC) BITSET_NOT_ (DST, SRC)
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/* Return DST == DST | SRC. */
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#define bitset_subset_p(DST, SRC) BITSET_SUBSET_P_ (DST, SRC)
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/* DST = SRC1 & SRC2. */
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#define bitset_and(DST, SRC1, SRC2) BITSET_AND_ (DST, SRC1, SRC2)
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/* DST = SRC1 & SRC2. Return non-zero if DST != SRC1 & SRC2. */
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#define bitset_and_cmp(DST, SRC1, SRC2) BITSET_AND_CMP_ (DST, SRC1, SRC2)
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/* DST = SRC1 & ~SRC2. */
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#define bitset_andn(DST, SRC1, SRC2) BITSET_ANDN_ (DST, SRC1, SRC2)
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/* DST = SRC1 & ~SRC2. Return non-zero if DST != SRC1 & ~SRC2. */
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#define bitset_andn_cmp(DST, SRC1, SRC2) BITSET_ANDN_CMP_ (DST, SRC1, SRC2)
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/* DST = SRC1 | SRC2. */
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#define bitset_or(DST, SRC1, SRC2) BITSET_OR_ (DST, SRC1, SRC2)
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/* DST = SRC1 | SRC2. Return non-zero if DST != SRC1 | SRC2. */
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#define bitset_or_cmp(DST, SRC1, SRC2) BITSET_OR_CMP_ (DST, SRC1, SRC2)
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/* DST = SRC1 ^ SRC2. */
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#define bitset_xor(DST, SRC1, SRC2) BITSET_XOR_ (DST, SRC1, SRC2)
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/* DST = SRC1 ^ SRC2. Return non-zero if DST != SRC1 ^ SRC2. */
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#define bitset_xor_cmp(DST, SRC1, SRC2) BITSET_XOR_CMP_ (DST, SRC1, SRC2)
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/* DST = (SRC1 & SRC2) | SRC3. */
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#define bitset_and_or(DST, SRC1, SRC2, SRC3) \
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BITSET_AND_OR_ (DST, SRC1, SRC2, SRC3)
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/* DST = (SRC1 & SRC2) | SRC3. Return non-zero if
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DST != (SRC1 & SRC2) | SRC3. */
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#define bitset_and_or_cmp(DST, SRC1, SRC2, SRC3) \
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BITSET_AND_OR_CMP_ (DST, SRC1, SRC2, SRC3)
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/* DST = (SRC1 & ~SRC2) | SRC3. */
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#define bitset_andn_or(DST, SRC1, SRC2, SRC3) \
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BITSET_ANDN_OR_ (DST, SRC1, SRC2, SRC3)
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/* DST = (SRC1 & ~SRC2) | SRC3. Return non-zero if
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DST != (SRC1 & ~SRC2) | SRC3. */
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#define bitset_andn_or_cmp(DST, SRC1, SRC2, SRC3) \
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BITSET_ANDN_OR_CMP_ (DST, SRC1, SRC2, SRC3)
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/* DST = (SRC1 | SRC2) & SRC3. */
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#define bitset_or_and(DST, SRC1, SRC2, SRC3)\
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BITSET_OR_AND_ (DST, SRC1, SRC2, SRC3)
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/* DST = (SRC1 | SRC2) & SRC3. Return non-zero if
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DST != (SRC1 | SRC2) & SRC3. */
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#define bitset_or_and_cmp(DST, SRC1, SRC2, SRC3)\
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BITSET_OR_AND_CMP_ (DST, SRC1, SRC2, SRC3)
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/* Find list of up to NUM bits set in BSET starting from and including
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*NEXT. Return with actual number of bits found and with *NEXT
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indicating where search stopped. */
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#define bitset_list(BSET, LIST, NUM, NEXT) \
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BITSET_LIST_ (BSET, LIST, NUM, NEXT)
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/* Find reverse list of up to NUM bits set in BSET starting from and
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including NEXT. Return with actual number of bits found and with
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*NEXT indicating where search stopped. */
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#define bitset_list_reverse(BSET, LIST, NUM, NEXT) \
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BITSET_LIST_REVERSE_ (BSET, LIST, NUM, NEXT)
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/* Find next set bit. */
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extern bitset_bindex bitset_next PARAMS ((bitset, bitset_bindex));
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/* Find previous set bit. */
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extern bitset_bindex bitset_prev PARAMS ((bitset, bitset_bindex));
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/* Find first set bit. */
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extern bitset_bindex bitset_first PARAMS ((bitset));
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/* Find last set bit. */
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extern bitset_bindex bitset_last PARAMS ((bitset));
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/* Return nonzero if this is the only set bit. */
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extern int bitset_only_set_p PARAMS ((bitset, bitset_bindex));
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/* Dump bitset. */
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extern void bitset_dump PARAMS ((FILE *, bitset));
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/* Loop over all elements of BSET, starting with MIN, setting BIT
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to the index of each set bit. For example, the following will print
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the bits set in a bitset:
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bitset_bindex i;
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bitset_iterator iter;
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bitset_zero (dst);
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BITSET_FOR_EACH (iter, src, i, 0)
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{
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printf ("%ld ", i);
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};
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*/
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#define BITSET_FOR_EACH(ITER, BSET, BIT, MIN) \
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for (ITER.next = (MIN), ITER.num = BITSET_LIST_SIZE; \
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(ITER.num == BITSET_LIST_SIZE) \
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&& (ITER.num = bitset_list (BSET, ITER.list, \
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BITSET_LIST_SIZE, &ITER.next));) \
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for (ITER.i = 0; (BIT) = ITER.list[ITER.i], ITER.i < ITER.num; ITER.i++)
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/* Loop over all elements of BSET, in reverse order starting with
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MIN, setting BIT to the index of each set bit. For example, the
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following will print the bits set in a bitset in reverse order:
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bitset_bindex i;
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bitset_iterator iter;
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bitset_zero (dst);
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BITSET_FOR_EACH_REVERSE (iter, src, i, 0)
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{
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printf ("%ld ", i);
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};
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*/
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#define BITSET_FOR_EACH_REVERSE(ITER, BSET, BIT, MIN) \
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for (ITER.next = (MIN), ITER.num = BITSET_LIST_SIZE; \
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(ITER.num == BITSET_LIST_SIZE) \
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&& (ITER.num = bitset_list_reverse (BSET, ITER.list, \
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BITSET_LIST_SIZE, &ITER.next));) \
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for (ITER.i = 0; (BIT) = ITER.list[ITER.i], ITER.i < ITER.num; ITER.i++)
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/* Define set operations in terms of logical operations. */
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#define bitset_diff(DST, SRC1, SRC2) bitset_andn (DST, SRC1, SRC2)
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#define bitset_diff_cmp(DST, SRC1, SRC2) bitset_andn_cmp (DST, SRC1, SRC2)
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#define bitset_intersection(DST, SRC1, SRC2) bitset_and (DST, SRC1, SRC2)
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#define bitset_intersection_cmp(DST, SRC1, SRC2) bitset_and_cmp (DST, SRC1, SRC2)
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#define bitset_union(DST, SRC1, SRC2) bitset_or (DST, SRC1, SRC2)
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#define bitset_union_cmp(DST, SRC1, SRC2) bitset_or_cmp (DST, SRC1, SRC2)
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/* Symmetrical difference. */
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#define bitset_symdiff(DST, SRC1, SRC2) bitset_xor (DST, SRC1, SRC2)
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#define bitset_symdiff_cmp(DST, SRC1, SRC2) bitset_xor_cmp (DST, SRC1, SRC2)
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/* Union of difference. */
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#define bitset_diff_union(DST, SRC1, SRC2, SRC3) \
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bitset_andn_or (DST, SRC1, SRC2, SRC3)
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#define bitset_diff_union_cmp(DST, SRC1, SRC2, SRC3) \
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bitset_andn_or_cmp (DST, SRC1, SRC2, SRC3)
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/* Release any memory tied up with bitsets. */
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extern void bitset_release_memory PARAMS ((void));
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/* Enable bitset stats gathering. */
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extern void bitset_stats_enable PARAMS ((void));
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/* Disable bitset stats gathering. */
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extern void bitset_stats_disable PARAMS ((void));
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/* Read bitset stats file of accummulated stats. */
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void bitset_stats_read PARAMS ((const char *filename));
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/* Write bitset stats file of accummulated stats. */
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void bitset_stats_write PARAMS ((const char *filename));
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/* Dump bitset stats. */
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extern void bitset_stats_dump PARAMS ((FILE *));
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/* Function to debug bitset from debugger. */
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extern void debug_bitset PARAMS ((bitset));
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/* Function to debug bitset stats from debugger. */
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extern void debug_bitset_stats PARAMS ((void));
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#endif /* _BITSET_H */
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