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/* Copyright (c) 2001, 2011, Oracle and/or its affiliates. Copyright (c) 2009, 2020, MariaDB Corporation. 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; version 2 of the License. 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA */ #ifndef _my_bitmap_h_ #define _my_bitmap_h_ #define MY_BIT_NONE (~(uint) 0) #include <m_string.h> #include <my_pthread.h> typedef ulonglong my_bitmap_map; typedef struct st_bitmap { my_bitmap_map *bitmap; my_bitmap_map *last_word_ptr; /* mutex will be acquired for the duration of each bitmap operation if thread_safe flag in bitmap_init was set. Otherwise, we optimize by not acquiring the mutex */ mysql_mutex_t *mutex; my_bitmap_map last_bit_mask; uint32 n_bits; /* number of bits occupied by the above */ my_bool bitmap_allocated; } MY_BITMAP; #ifdef __cplusplus extern "C" { #endif /* Reset memory. Faster then doing a full bzero */ #define my_bitmap_clear(A) ((A)->bitmap= 0) extern void create_last_bit_mask(MY_BITMAP *map); extern my_bool my_bitmap_init(MY_BITMAP *map, my_bitmap_map *buf, uint n_bits, my_bool thread_safe); extern my_bool bitmap_is_clear_all(const MY_BITMAP *map); extern my_bool bitmap_is_prefix(const MY_BITMAP *map, uint prefix_size); extern my_bool bitmap_is_set_all(const MY_BITMAP *map); extern my_bool bitmap_is_subset(const MY_BITMAP *map1, const MY_BITMAP *map2); extern my_bool bitmap_is_overlapping(const MY_BITMAP *map1, const MY_BITMAP *map2); extern my_bool bitmap_test_and_set(MY_BITMAP *map, uint bitmap_bit); extern my_bool bitmap_test_and_clear(MY_BITMAP *map, uint bitmap_bit); extern my_bool bitmap_fast_test_and_set(MY_BITMAP *map, uint bitmap_bit); extern my_bool bitmap_fast_test_and_clear(MY_BITMAP *map, uint bitmap_bit); extern my_bool bitmap_union_is_set_all(const MY_BITMAP *map1, const MY_BITMAP *map2); extern my_bool bitmap_exists_intersection(MY_BITMAP **bitmap_array, uint bitmap_count, uint start_bit, uint end_bit); extern uint bitmap_set_next(MY_BITMAP *map); extern uint bitmap_get_first_clear(const MY_BITMAP *map); extern uint bitmap_get_first_set(const MY_BITMAP *map); extern uint bitmap_bits_set(const MY_BITMAP *map); extern uint bitmap_get_next_set(const MY_BITMAP *map, uint bitmap_bit); extern void my_bitmap_free(MY_BITMAP *map); extern void bitmap_set_above(MY_BITMAP *map, uint from_byte, uint use_bit); extern void bitmap_set_prefix(MY_BITMAP *map, uint prefix_size); extern void bitmap_intersect(MY_BITMAP *map, const MY_BITMAP *map2); extern void bitmap_subtract(MY_BITMAP *map, const MY_BITMAP *map2); extern void bitmap_union(MY_BITMAP *map, const MY_BITMAP *map2); extern void bitmap_xor(MY_BITMAP *map, const MY_BITMAP *map2); extern void bitmap_invert(MY_BITMAP *map); extern void bitmap_copy(MY_BITMAP *map, const MY_BITMAP *map2); /* Functions to export/import bitmaps to an architecture independent format */ extern void bitmap_export(uchar *to, MY_BITMAP *map); extern void bitmap_import(MY_BITMAP *map, uchar *from); extern uint bitmap_lock_set_next(MY_BITMAP *map); extern void bitmap_lock_clear_bit(MY_BITMAP *map, uint bitmap_bit); #define my_bitmap_map_bytes sizeof(my_bitmap_map) #define my_bitmap_map_bits (my_bitmap_map_bytes*8) /* Size in bytes to store 'bits' number of bits */ #define bitmap_buffer_size(bits) (MY_ALIGN((bits), my_bitmap_map_bits)/8) #define my_bitmap_buffer_size(map) bitmap_buffer_size((map)->n_bits) #define no_bytes_in_export_map(map) (((map)->n_bits + 7)/8) #define no_words_in_map(map) (((map)->n_bits + (my_bitmap_map_bits-1))/my_bitmap_map_bits) /* Fast, not thread safe, bitmap functions */ /* The following functions must be compatible with create_last_bit_mask()! */ static inline void bitmap_set_bit(MY_BITMAP *map,uint bit) { DBUG_ASSERT(bit < map->n_bits); map->bitmap[bit/my_bitmap_map_bits]|= (1ULL << (bit & (my_bitmap_map_bits-1))); } static inline void bitmap_flip_bit(MY_BITMAP *map,uint bit) { DBUG_ASSERT(bit < map->n_bits); map->bitmap[bit/my_bitmap_map_bits]^= (1ULL << (bit & (my_bitmap_map_bits-1))); } static inline void bitmap_clear_bit(MY_BITMAP *map,uint bit) { DBUG_ASSERT(bit < map->n_bits); map->bitmap[bit/my_bitmap_map_bits]&= ~(1ULL << (bit & (my_bitmap_map_bits-1))); } static inline uint bitmap_is_set(const MY_BITMAP *map,uint bit) { DBUG_ASSERT(bit < map->n_bits); return (!!(map->bitmap[bit/my_bitmap_map_bits] & (1ULL << (bit & (my_bitmap_map_bits-1))))); } /* Return true if bitmaps are equal */ static inline my_bool bitmap_cmp(const MY_BITMAP *map1, const MY_BITMAP *map2) { DBUG_ASSERT(map1->n_bits == map2->n_bits); return (memcmp(map1->bitmap, map2->bitmap, my_bitmap_buffer_size(map1)) == 0); } #define bitmap_clear_all(MAP) \ { memset((MAP)->bitmap, 0, my_bitmap_buffer_size(MAP)); } static inline void bitmap_set_all(const MY_BITMAP *map) { if (map->n_bits) { memset(map->bitmap, 0xFF, my_bitmap_map_bytes * (no_words_in_map(map)-1)); DBUG_ASSERT(map->bitmap + no_words_in_map(map)-1 == map->last_word_ptr); *map->last_word_ptr= ~map->last_bit_mask; } } #ifdef __cplusplus } #endif #endif /* _my_bitmap_h_ */