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Open Menu / tools / testing / selftests / kvm / include / sparsebit.h
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/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * tools/testing/selftests/kvm/include/sparsebit.h
 *
 * Copyright (C) 2018, Google LLC.
 *
 * Header file that describes API to the sparsebit library.
 * This library provides a memory efficient means of storing
 * the settings of bits indexed via a uint64_t.  Memory usage
 * is reasonable, significantly less than (2^64 / 8) bytes, as
 * long as bits that are mostly set or mostly cleared are close
 * to each other.  This library is efficient in memory usage
 * even in the case where most bits are set.
 */

#ifndef SELFTEST_KVM_SPARSEBIT_H
#define SELFTEST_KVM_SPARSEBIT_H

#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>

#ifdef __cplusplus
extern "C" {
#endif

struct sparsebit;
typedef uint64_t sparsebit_idx_t;
typedef uint64_t sparsebit_num_t;

struct sparsebit *sparsebit_alloc(void);
void sparsebit_free(struct sparsebit **sbitp);
void sparsebit_copy(struct sparsebit *dstp, struct sparsebit *src);

bool sparsebit_is_set(struct sparsebit *sbit, sparsebit_idx_t idx);
bool sparsebit_is_set_num(struct sparsebit *sbit,
			  sparsebit_idx_t idx, sparsebit_num_t num);
bool sparsebit_is_clear(struct sparsebit *sbit, sparsebit_idx_t idx);
bool sparsebit_is_clear_num(struct sparsebit *sbit,
			    sparsebit_idx_t idx, sparsebit_num_t num);
sparsebit_num_t sparsebit_num_set(struct sparsebit *sbit);
bool sparsebit_any_set(struct sparsebit *sbit);
bool sparsebit_any_clear(struct sparsebit *sbit);
bool sparsebit_all_set(struct sparsebit *sbit);
bool sparsebit_all_clear(struct sparsebit *sbit);
sparsebit_idx_t sparsebit_first_set(struct sparsebit *sbit);
sparsebit_idx_t sparsebit_first_clear(struct sparsebit *sbit);
sparsebit_idx_t sparsebit_next_set(struct sparsebit *sbit, sparsebit_idx_t prev);
sparsebit_idx_t sparsebit_next_clear(struct sparsebit *sbit, sparsebit_idx_t prev);
sparsebit_idx_t sparsebit_next_set_num(struct sparsebit *sbit,
				       sparsebit_idx_t start, sparsebit_num_t num);
sparsebit_idx_t sparsebit_next_clear_num(struct sparsebit *sbit,
					 sparsebit_idx_t start, sparsebit_num_t num);

void sparsebit_set(struct sparsebit *sbitp, sparsebit_idx_t idx);
void sparsebit_set_num(struct sparsebit *sbitp, sparsebit_idx_t start,
		       sparsebit_num_t num);
void sparsebit_set_all(struct sparsebit *sbitp);

void sparsebit_clear(struct sparsebit *sbitp, sparsebit_idx_t idx);
void sparsebit_clear_num(struct sparsebit *sbitp,
			 sparsebit_idx_t start, sparsebit_num_t num);
void sparsebit_clear_all(struct sparsebit *sbitp);

void sparsebit_dump(FILE *stream, struct sparsebit *sbit,
		    unsigned int indent);
void sparsebit_validate_internal(struct sparsebit *sbit);

#ifdef __cplusplus
}
#endif

#endif /* SELFTEST_KVM_SPARSEBIT_H */