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Commit	Line	Data
	1	/* A simple, memory-efficient bitset implementation.
	2
	3	Copyright (C) 2009-2015 Free Software Foundation, Inc.
	4
	5	This file is part of Bison, the GNU Compiler Compiler.
	6
	7	This program is free software: you can redistribute it and/or modify
	8	it under the terms of the GNU General Public License as published by
	9	the Free Software Foundation, either version 3 of the License, or
	10	(at your option) any later version.
	11
	12	This program is distributed in the hope that it will be useful,
	13	but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	GNU General Public License for more details.
	16
	17	You should have received a copy of the GNU General Public License
	18	along with this program. If not, see <http://www.gnu.org/licenses/>. */
	19
	20	#ifndef SBITSET_H_
	21	# define SBITSET_H_
	22
	23	typedef unsigned char *Sbitset;
	24	typedef size_t Sbitset__Index;
	25	# define SBITSET__INDEX__CONVERSION_SPEC "zu"
	26
	27	# define Sbitset__nbytes(NBITS) \
	28	(((NBITS) + CHAR_BIT - 1) / CHAR_BIT)
	29	# define Sbitset__byteAddress(SELF, INDEX) \
	30	(((SELF) + (INDEX) / CHAR_BIT))
	31	# define Sbitset__bit_mask(INDEX) \
	32	(1 << (CHAR_BIT - 1 - (INDEX) % CHAR_BIT))
	33	# define Sbitset__last_byte_mask(NBITS) \
	34	(UCHAR_MAX << (CHAR_BIT - 1 - ((NBITS) - 1) % CHAR_BIT))
	35
	36	/* nbits must not be 0. */
	37	Sbitset Sbitset__new (Sbitset__Index nbits);
	38	Sbitset Sbitset__new_on_obstack (Sbitset__Index nbits,
	39	struct obstack *obstackp);
	40	void Sbitset__delete (Sbitset self);
	41
	42	# define Sbitset__test(SELF, INDEX) \
	43	((*Sbitset__byteAddress ((SELF), (INDEX)) & Sbitset__bit_mask (INDEX)) != 0)
	44
	45	bool Sbitset__isEmpty (Sbitset self, Sbitset__Index nbits);
	46
	47	void Sbitset__fprint (Sbitset self, Sbitset__Index nbits, FILE *file);
	48
	49	# define Sbitset__set(SELF, INDEX) \
	50	do { \
	51	*Sbitset__byteAddress ((SELF), (INDEX)) = \
	52	*Sbitset__byteAddress ((SELF), (INDEX)) \| Sbitset__bit_mask (INDEX); \
	53	} while (0)
	54
	55	# define Sbitset__reset(SELF, INDEX) \
	56	do { \
	57	*Sbitset__byteAddress ((SELF), (INDEX)) = \
	58	*Sbitset__byteAddress ((SELF), (INDEX)) & ~Sbitset__bit_mask (INDEX); \
	59	} while (0)
	60
	61	/* NBITS is the size of the bitset. More than NBITS bits might be reset. */
	62	# define Sbitset__zero(SELF, NBITS) \
	63	do { \
	64	memset (SELF, 0, Sbitset__nbytes (NBITS)); \
	65	} while (0)
	66
	67	/* NBITS is the size of the bitset. More than NBITS bits might be set. */
	68	# define Sbitset__ones(SELF, NBITS) \
	69	do { \
	70	memset (SELF, UCHAR_MAX, Sbitset__nbytes (NBITS)); \
	71	} while (0)
	72
	73	/* NBITS is the size of every bitset. More than NBITS bits might be set. */
	74	# define Sbitset__or(SELF, OTHER1, OTHER2, NBITS) \
	75	do { \
	76	Sbitset ptr_self = (SELF); \
	77	Sbitset ptr_other1 = (OTHER1); \
	78	Sbitset ptr_other2 = (OTHER2); \
	79	Sbitset end_self = ptr_self + Sbitset__nbytes (NBITS); \
	80	for (; ptr_self < end_self; ++ptr_self, ++ptr_other1, ++ptr_other2) \
	81	ptr_self = ptr_other1 \| *ptr_other2; \
	82	} while (0)
	83
	84	# define SBITSET__FOR_EACH(SELF, NBITS, ITER, INDEX) \
	85	for ((ITER) = (SELF); (ITER) < (SELF) + Sbitset__nbytes (NBITS); ++(ITER)) \
	86	if (*(ITER) != 0) \
	87	for ((INDEX) = ((ITER)-(SELF))*CHAR_BIT; \
	88	(INDEX) < (NBITS) && (SELF)+(INDEX)/CHAR_BIT < (ITER)+1; \
	89	++(INDEX)) \
	90	if (((*ITER) & Sbitset__bit_mask (INDEX)) != 0)
	91
	92	#endif /* !SBITSET_H_ */