mirror of
https://git.savannah.gnu.org/git/bison.git
synced 2026-03-09 12:23:04 +00:00
281 lines
10 KiB
C
281 lines
10 KiB
C
/* Base bitset stuff.
|
|
Copyright (C) 2002, 2003 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 _BBITSET_H
|
|
#define _BBITSET_H
|
|
|
|
#include "libiberty.h"
|
|
|
|
#include <limits.h>
|
|
|
|
/* Currently we support three flavours of bitsets:
|
|
BITSET_ARRAY: Array of bits (fixed size, fast for dense bitsets).
|
|
BITSET_LIST: Linked list of array of bits (variable size, least storage
|
|
for large very sparse sets).
|
|
BITSET_TABLE: Expandable table of pointers to array of bits
|
|
(variable size, less storage for large sparse sets).
|
|
|
|
BITSET_STATS: Wrapper bitset for internal use only.
|
|
*/
|
|
enum bitset_type {BITSET_ARRAY, BITSET_LIST, BITSET_TABLE, BITSET_TYPE_NUM,
|
|
BITSET_STATS};
|
|
#define BITSET_TYPE_NAMES {"abitset", "lbitset", "ebitset"}
|
|
|
|
extern const char * const bitset_type_names[];
|
|
|
|
enum bitset_alloc_type {BITSET_MALLOC, BITSET_OBALLOC};
|
|
|
|
/* Data type used to store a word of bits. */
|
|
typedef unsigned long bitset_word;
|
|
#define BITSET_WORD_BITS ((unsigned) (CHAR_BIT * sizeof (bitset_word)))
|
|
|
|
/* Bit index. In theory we might need a type wider than size_t, but
|
|
in practice we lose at most a factor of CHAR_BIT by going with
|
|
size_t, and that is good enough. If this type is changed to be
|
|
wider than size_t, the code needs to be modified to check for
|
|
overflow when converting bit counts to byte or word counts.
|
|
The bit and word index types must be unsigned. */
|
|
typedef size_t bitset_bindex;
|
|
|
|
/* Word index. */
|
|
typedef size_t bitset_windex;
|
|
|
|
/* Maximum values for commonly-used unsigned types. BITSET_SIZE_MAX
|
|
always equals SIZE_MAX, but some older systems lack SIZE_MAX. */
|
|
#define BITSET_BINDEX_MAX ((bitset_bindex) -1)
|
|
|
|
/* Limit max word index to the maximum value of a signed integer
|
|
to simplify cache disabling. */
|
|
#define BITSET_WINDEX_MAX (((bitset_windex) -1) >> 1)
|
|
#define BITSET_SIZE_MAX ((size_t) -1)
|
|
|
|
#define BITSET_MSB ((bitset_word) 1 << (BITSET_WORD_BITS - 1))
|
|
|
|
#define BITSET_LIST_SIZE 1024
|
|
|
|
enum bitset_ops {BITSET_OP_ZERO, BITSET_OP_ONES,
|
|
BITSET_OP_COPY, BITSET_OP_NOT,
|
|
BITSET_OP_EMPTY_P, BITSET_OP_EQUAL_P,
|
|
BITSET_OP_SUBSET_P, BITSET_OP_DISJOINT_P,
|
|
BITSET_OP_AND, BITSET_OP_OR, BITSET_OP_XOR, BITSET_OP_ANDN,
|
|
BITSET_OP_OR_AND, BITSET_OP_AND_OR, BITSET_OP_ANDN_OR};
|
|
|
|
struct bbitset_struct
|
|
{
|
|
const struct bitset_vtable * vtable;
|
|
bitset_windex cindex; /* Cache word index. */
|
|
bitset_windex csize; /* Cache size in words. */
|
|
bitset_word *cdata; /* Cache data pointer. */
|
|
/* Perhaps we could sacrifice another word to indicate
|
|
that the bitset is known to be zero, that a bit has been set
|
|
in the cache, and that a bit has been cleared in the cache.
|
|
This would speed up some of the searches but slightly slow down
|
|
bit set/reset operations of cached bits. */
|
|
};
|
|
|
|
|
|
typedef union bitset_union *bitset;
|
|
|
|
|
|
/* The contents of this structure should be considered private. */
|
|
struct bitset_vtable
|
|
{
|
|
void (*set) PARAMS ((bitset, bitset_bindex));
|
|
void (*reset) PARAMS ((bitset, bitset_bindex));
|
|
int (*toggle) PARAMS ((bitset, bitset_bindex));
|
|
int (*test) PARAMS ((bitset, bitset_bindex));
|
|
bitset_bindex (*size) PARAMS ((bitset));
|
|
bitset_bindex (*count) PARAMS ((bitset));
|
|
|
|
int (*empty_p) PARAMS ((bitset));
|
|
void (*ones) PARAMS ((bitset));
|
|
void (*zero) PARAMS ((bitset));
|
|
|
|
void (*copy) PARAMS ((bitset, bitset));
|
|
int (*disjoint_p) PARAMS ((bitset, bitset));
|
|
int (*equal_p) PARAMS ((bitset, bitset));
|
|
void (*not) PARAMS ((bitset, bitset));
|
|
int (*subset_p) PARAMS ((bitset, bitset));
|
|
|
|
void (*and) PARAMS ((bitset, bitset, bitset));
|
|
int (*and_cmp) PARAMS ((bitset, bitset, bitset));
|
|
void (*andn) PARAMS ((bitset, bitset, bitset));
|
|
int (*andn_cmp) PARAMS ((bitset, bitset, bitset));
|
|
void (*or) PARAMS ((bitset, bitset, bitset));
|
|
int (*or_cmp) PARAMS ((bitset, bitset, bitset));
|
|
void (*xor) PARAMS ((bitset, bitset, bitset));
|
|
int (*xor_cmp) PARAMS ((bitset, bitset, bitset));
|
|
|
|
void (*and_or) PARAMS ((bitset, bitset, bitset, bitset));
|
|
int (*and_or_cmp) PARAMS ((bitset, bitset, bitset, bitset));
|
|
void (*andn_or) PARAMS ((bitset, bitset, bitset, bitset));
|
|
int (*andn_or_cmp) PARAMS ((bitset, bitset, bitset, bitset));
|
|
void (*or_and) PARAMS ((bitset, bitset, bitset, bitset));
|
|
int (*or_and_cmp) PARAMS ((bitset, bitset, bitset, bitset));
|
|
|
|
bitset_bindex (*list) PARAMS ((bitset, bitset_bindex *,
|
|
bitset_bindex, bitset_bindex *));
|
|
bitset_bindex (*list_reverse) PARAMS ((bitset,
|
|
bitset_bindex *, bitset_bindex,
|
|
bitset_bindex *));
|
|
void (*free) PARAMS ((bitset));
|
|
enum bitset_type type;
|
|
};
|
|
|
|
#define BITSET_COMPATIBLE_(BSET1, BSET2) ((BSET1)->b.vtable == (BSET2)->b.vtable)
|
|
|
|
#define BITSET_CHECK2_(DST, SRC) \
|
|
if (!BITSET_COMPATIBLE_ (DST, SRC)) abort ();
|
|
|
|
#define BITSET_CHECK3_(DST, SRC1, SRC2) \
|
|
if (!BITSET_COMPATIBLE_ (DST, SRC1) \
|
|
|| !BITSET_COMPATIBLE_ (DST, SRC2)) abort ();
|
|
|
|
#define BITSET_CHECK4_(DST, SRC1, SRC2, SRC3) \
|
|
if (!BITSET_COMPATIBLE_ (DST, SRC1) || !BITSET_COMPATIBLE_ (DST, SRC2) \
|
|
|| !BITSET_COMPATIBLE_ (DST, SRC3)) abort ();
|
|
|
|
|
|
/* Return size in bits of bitset SRC. */
|
|
#define BITSET_SIZE_(SRC) (SRC)->b.vtable->size (SRC)
|
|
|
|
/* Return number of bits set in bitset SRC. */
|
|
#define BITSET_COUNT_(SRC) (SRC)->b.vtable->count (SRC)
|
|
|
|
/* Return type of bitset SRC. */
|
|
#define BITSET_TYPE_(DST) (DST)->b.vtable->type
|
|
|
|
/* Set bit BITNO in bitset DST. */
|
|
#define BITSET_SET_(DST, BITNO) (DST)->b.vtable->set (DST, BITNO)
|
|
|
|
/* Reset bit BITNO in bitset DST. */
|
|
#define BITSET_RESET_(DST, BITNO) (DST)->b.vtable->reset (DST, BITNO)
|
|
|
|
/* Toggle bit BITNO in bitset DST. */
|
|
#define BITSET_TOGGLE_(DST, BITNO) (DST)->b.vtable->toggle (DST, BITNO)
|
|
|
|
/* Return non-zero if bit BITNO in bitset SRC is set. */
|
|
#define BITSET_TEST_(SRC, BITNO) (SRC)->b.vtable->test (SRC, BITNO)
|
|
|
|
/* Free bitset SRC. */
|
|
#define BITSET_FREE_(SRC)\
|
|
((SRC)->b.vtable->free ? (SRC)->b.vtable->free (SRC) :(void)0)
|
|
|
|
|
|
/* Return SRC == 0. */
|
|
#define BITSET_EMPTY_P_(SRC) (SRC)->b.vtable->empty_p (SRC)
|
|
|
|
/* DST = ~0. */
|
|
#define BITSET_ONES_(DST) (DST)->b.vtable->ones (DST)
|
|
|
|
/* DST = 0. */
|
|
#define BITSET_ZERO_(DST) (DST)->b.vtable->zero (DST)
|
|
|
|
|
|
|
|
/* DST = SRC. */
|
|
#define BITSET_COPY_(DST, SRC) (SRC)->b.vtable->copy (DST, SRC)
|
|
|
|
/* Return DST & SRC == 0. */
|
|
#define BITSET_DISJOINT_P_(DST, SRC) (SRC)->b.vtable->disjoint_p (DST, SRC)
|
|
|
|
/* Return DST == SRC. */
|
|
#define BITSET_EQUAL_P_(DST, SRC) (SRC)->b.vtable->equal_p (DST, SRC)
|
|
|
|
/* DST = ~SRC. */
|
|
#define BITSET_NOT_(DST, SRC) (SRC)->b.vtable->not (DST, SRC)
|
|
|
|
/* Return DST == DST | SRC. */
|
|
#define BITSET_SUBSET_P_(DST, SRC) (SRC)->b.vtable->subset_p (DST, SRC)
|
|
|
|
|
|
/* DST = SRC1 & SRC2. */
|
|
#define BITSET_AND_(DST, SRC1, SRC2) (SRC1)->b.vtable->and (DST, SRC1, SRC2)
|
|
#define BITSET_AND_CMP_(DST, SRC1, SRC2) (SRC1)->b.vtable->and_cmp (DST, SRC1, SRC2)
|
|
|
|
/* DST = SRC1 & ~SRC2. */
|
|
#define BITSET_ANDN_(DST, SRC1, SRC2) (SRC1)->b.vtable->andn (DST, SRC1, SRC2)
|
|
#define BITSET_ANDN_CMP_(DST, SRC1, SRC2) (SRC1)->b.vtable->andn_cmp (DST, SRC1, SRC2)
|
|
|
|
/* DST = SRC1 | SRC2. */
|
|
#define BITSET_OR_(DST, SRC1, SRC2) (SRC1)->b.vtable->or (DST, SRC1, SRC2)
|
|
#define BITSET_OR_CMP_(DST, SRC1, SRC2) (SRC1)->b.vtable->or_cmp (DST, SRC1, SRC2)
|
|
|
|
/* DST = SRC1 ^ SRC2. */
|
|
#define BITSET_XOR_(DST, SRC1, SRC2) (SRC1)->b.vtable->xor (DST, SRC1, SRC2)
|
|
#define BITSET_XOR_CMP_(DST, SRC1, SRC2) (SRC1)->b.vtable->xor_cmp (DST, SRC1, SRC2)
|
|
|
|
|
|
|
|
/* DST = (SRC1 & SRC2) | SRC3. Return non-zero if
|
|
DST != (SRC1 & SRC2) | SRC3. */
|
|
#define BITSET_AND_OR_(DST, SRC1, SRC2, SRC3) \
|
|
(SRC1)->b.vtable->and_or (DST, SRC1, SRC2, SRC3)
|
|
#define BITSET_AND_OR_CMP_(DST, SRC1, SRC2, SRC3) \
|
|
(SRC1)->b.vtable->and_or_cmp (DST, SRC1, SRC2, SRC3)
|
|
|
|
/* DST = (SRC1 & ~SRC2) | SRC3. Return non-zero if
|
|
DST != (SRC1 & ~SRC2) | SRC3. */
|
|
#define BITSET_ANDN_OR_(DST, SRC1, SRC2, SRC3) \
|
|
(SRC1)->b.vtable->andn_or (DST, SRC1, SRC2, SRC3)
|
|
#define BITSET_ANDN_OR_CMP_(DST, SRC1, SRC2, SRC3) \
|
|
(SRC1)->b.vtable->andn_or_cmp (DST, SRC1, SRC2, SRC3)
|
|
|
|
/* DST = (SRC1 | SRC2) & SRC3. Return non-zero if
|
|
DST != (SRC1 | SRC2) & SRC3. */
|
|
#define BITSET_OR_AND_(DST, SRC1, SRC2, SRC3) \
|
|
(SRC1)->b.vtable->or_and (DST, SRC1, SRC2, SRC3)
|
|
#define BITSET_OR_AND_CMP_(DST, SRC1, SRC2, SRC3) \
|
|
(SRC1)->b.vtable->or_and_cmp (DST, SRC1, SRC2, SRC3)
|
|
|
|
|
|
/* 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. */
|
|
#define BITSET_LIST_(BSET, LIST, NUM, NEXT) \
|
|
(BSET)->b.vtable->list (BSET, LIST, NUM, NEXT)
|
|
|
|
/* 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_LIST_REVERSE_(BSET, LIST, NUM, NEXT) \
|
|
(BSET)->b.vtable->list_reverse (BSET, LIST, NUM, NEXT)
|
|
|
|
|
|
/* Private functions for bitset implementations. */
|
|
|
|
extern int bitset_toggle_ PARAMS ((bitset, bitset_bindex));
|
|
|
|
extern bitset_bindex bitset_count_ PARAMS ((bitset));
|
|
|
|
extern int bitset_copy_ PARAMS ((bitset, bitset));
|
|
|
|
extern void bitset_and_or_ PARAMS ((bitset, bitset, bitset, bitset));
|
|
|
|
extern int bitset_and_or_cmp_ PARAMS ((bitset, bitset, bitset, bitset));
|
|
|
|
extern void bitset_andn_or_ PARAMS ((bitset, bitset, bitset, bitset));
|
|
|
|
extern int bitset_andn_or_cmp_ PARAMS ((bitset, bitset, bitset, bitset));
|
|
|
|
extern void bitset_or_and_ PARAMS ((bitset, bitset, bitset, bitset));
|
|
|
|
extern int bitset_or_and_cmp_ PARAMS ((bitset, bitset, bitset, bitset));
|
|
|
|
#endif /* _BBITSET_H */
|