tools/testing/selftests/kvm/include/sparsebit.h

   1 /*
   2  * tools/testing/selftests/kvm/include/sparsebit.h
   3  *
   4  * Copyright (C) 2018, Google LLC.
   5  *
   6  * This work is licensed under the terms of the GNU GPL, version 2.
   7  *
   8  *
   9  * Header file that describes API to the sparsebit library.
  10  * This library provides a memory efficient means of storing
  11  * the settings of bits indexed via a uint64_t.  Memory usage
  12  * is reasonable, significantly less than (2^64 / 8) bytes, as
  13  * long as bits that are mostly set or mostly cleared are close
  14  * to each other.  This library is efficient in memory usage
  15  * even in the case where most bits are set.
  16  */
  17
  18 #ifndef _TEST_SPARSEBIT_H_
  19 #define _TEST_SPARSEBIT_H_
  20
  21 #include <stdbool.h>
  22 #include <stdint.h>
  23 #include <stdio.h>
  24
  25 #ifdef __cplusplus
  26 extern "C" {
  27 #endif
  28
  29 struct sparsebit;
  30 typedef uint64_t sparsebit_idx_t;
  31 typedef uint64_t sparsebit_num_t;
  32
  33 struct sparsebit *sparsebit_alloc(void);
  34 void sparsebit_free(struct sparsebit **sbitp);
  35 void sparsebit_copy(struct sparsebit *dstp, struct sparsebit *src);
  36
  37 bool sparsebit_is_set(struct sparsebit *sbit, sparsebit_idx_t idx);
  38 bool sparsebit_is_set_num(struct sparsebit *sbit,
  39                           sparsebit_idx_t idx, sparsebit_num_t num);
  40 bool sparsebit_is_clear(struct sparsebit *sbit, sparsebit_idx_t idx);
  41 bool sparsebit_is_clear_num(struct sparsebit *sbit,
  42                             sparsebit_idx_t idx, sparsebit_num_t num);
  43 sparsebit_num_t sparsebit_num_set(struct sparsebit *sbit);
  44 bool sparsebit_any_set(struct sparsebit *sbit);
  45 bool sparsebit_any_clear(struct sparsebit *sbit);
  46 bool sparsebit_all_set(struct sparsebit *sbit);
  47 bool sparsebit_all_clear(struct sparsebit *sbit);
  48 sparsebit_idx_t sparsebit_first_set(struct sparsebit *sbit);
  49 sparsebit_idx_t sparsebit_first_clear(struct sparsebit *sbit);
  50 sparsebit_idx_t sparsebit_next_set(struct sparsebit *sbit, sparsebit_idx_t prev);
  51 sparsebit_idx_t sparsebit_next_clear(struct sparsebit *sbit, sparsebit_idx_t prev);
  52 sparsebit_idx_t sparsebit_next_set_num(struct sparsebit *sbit,
  53                                        sparsebit_idx_t start, sparsebit_num_t num);
  54 sparsebit_idx_t sparsebit_next_clear_num(struct sparsebit *sbit,
  55                                          sparsebit_idx_t start, sparsebit_num_t num);
  56
  57 void sparsebit_set(struct sparsebit *sbitp, sparsebit_idx_t idx);
  58 void sparsebit_set_num(struct sparsebit *sbitp, sparsebit_idx_t start,
  59                        sparsebit_num_t num);
  60 void sparsebit_set_all(struct sparsebit *sbitp);
  61
  62 void sparsebit_clear(struct sparsebit *sbitp, sparsebit_idx_t idx);
  63 void sparsebit_clear_num(struct sparsebit *sbitp,
  64                          sparsebit_idx_t start, sparsebit_num_t num);
  65 void sparsebit_clear_all(struct sparsebit *sbitp);
  66
  67 void sparsebit_dump(FILE *stream, struct sparsebit *sbit,
  68                     unsigned int indent);
  69 void sparsebit_validate_internal(struct sparsebit *sbit);
  70
  71 #ifdef __cplusplus
  72 }
  73 #endif
  74
  75 #endif /* _TEST_SPARSEBIT_H_ */