mirror of
https://git.savannah.gnu.org/git/bison.git
synced 2026-03-09 12:23:04 +00:00
93 lines
4.3 KiB
C
93 lines
4.3 KiB
C
/* A simple, memory-efficient bitset implementation.
|
|
|
|
Copyright (C) 2009-2012 Free Software Foundation, Inc.
|
|
|
|
This file is part of Bison, the GNU Compiler Compiler.
|
|
|
|
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 3 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, see <http://www.gnu.org/licenses/>. */
|
|
|
|
#ifndef SBITSET_H_
|
|
# define SBITSET_H_
|
|
|
|
typedef unsigned char *Sbitset;
|
|
typedef size_t Sbitset__Index;
|
|
#define SBITSET__INDEX__CONVERSION_SPEC "zu"
|
|
|
|
#define Sbitset__nbytes(NBITS) \
|
|
(((NBITS) + CHAR_BIT - 1) / CHAR_BIT)
|
|
#define Sbitset__byteAddress(SELF, INDEX) \
|
|
(((SELF) + (INDEX) / CHAR_BIT))
|
|
#define Sbitset__bit_mask(INDEX) \
|
|
(1 << (CHAR_BIT - 1 - (INDEX) % CHAR_BIT))
|
|
#define Sbitset__last_byte_mask(NBITS) \
|
|
(UCHAR_MAX << (CHAR_BIT - 1 - ((NBITS) - 1) % CHAR_BIT))
|
|
|
|
/* nbits must not be 0. */
|
|
Sbitset Sbitset__new (Sbitset__Index nbits);
|
|
Sbitset Sbitset__new_on_obstack (Sbitset__Index nbits,
|
|
struct obstack *obstackp);
|
|
void Sbitset__delete (Sbitset self);
|
|
|
|
#define Sbitset__test(SELF, INDEX) \
|
|
((*Sbitset__byteAddress ((SELF), (INDEX)) & Sbitset__bit_mask (INDEX)) != 0)
|
|
|
|
bool Sbitset__isEmpty (Sbitset self, Sbitset__Index nbits);
|
|
|
|
void Sbitset__fprint(Sbitset self, Sbitset__Index nbits, FILE *file);
|
|
|
|
#define Sbitset__set(SELF, INDEX) \
|
|
do { \
|
|
*Sbitset__byteAddress ((SELF), (INDEX)) = \
|
|
*Sbitset__byteAddress ((SELF), (INDEX)) | Sbitset__bit_mask (INDEX); \
|
|
} while(0)
|
|
|
|
#define Sbitset__reset(SELF, INDEX) \
|
|
do { \
|
|
*Sbitset__byteAddress ((SELF), (INDEX)) = \
|
|
*Sbitset__byteAddress ((SELF), (INDEX)) & ~Sbitset__bit_mask (INDEX); \
|
|
} while(0)
|
|
|
|
/* NBITS is the size of the bitset. More than NBITS bits might be reset. */
|
|
#define Sbitset__zero(SELF, NBITS) \
|
|
do { \
|
|
memset (SELF, 0, Sbitset__nbytes (NBITS)); \
|
|
} while(0)
|
|
|
|
/* NBITS is the size of the bitset. More than NBITS bits might be set. */
|
|
#define Sbitset__ones(SELF, NBITS) \
|
|
do { \
|
|
memset (SELF, UCHAR_MAX, Sbitset__nbytes (NBITS)); \
|
|
} while(0)
|
|
|
|
/* NBITS is the size of every bitset. More than NBITS bits might be set. */
|
|
#define Sbitset__or(SELF, OTHER1, OTHER2, NBITS) \
|
|
do { \
|
|
Sbitset ptr_self = (SELF); \
|
|
Sbitset ptr_other1 = (OTHER1); \
|
|
Sbitset ptr_other2 = (OTHER2); \
|
|
Sbitset end_self = ptr_self + Sbitset__nbytes (NBITS); \
|
|
for (; ptr_self < end_self; ++ptr_self, ++ptr_other1, ++ptr_other2) \
|
|
*ptr_self = *ptr_other1 | *ptr_other2; \
|
|
} while(0)
|
|
|
|
#define SBITSET__FOR_EACH(SELF, NBITS, ITER, INDEX) \
|
|
for ((ITER) = (SELF); (ITER) < (SELF) + Sbitset__nbytes (NBITS); ++(ITER)) \
|
|
if (*(ITER) != 0) \
|
|
for ((INDEX) = ((ITER)-(SELF))*CHAR_BIT; \
|
|
(INDEX) < (NBITS) && (SELF)+(INDEX)/CHAR_BIT < (ITER)+1; \
|
|
++(INDEX)) \
|
|
if (((*ITER) & Sbitset__bit_mask (INDEX)) != 0)
|
|
|
|
#endif /* !SBITSET_H_ */
|