MySQL 8.4.3
Source Code Documentation
my_tree.h
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17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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23
24#ifndef _tree_h
25#define _tree_h
26
27/**
28 @file include/my_tree.h
29*/
30
31#include <stddef.h>
32#include <sys/types.h>
33
34#include "my_alloc.h" /* MEM_ROOT */
35#include "my_base.h" /* get 'enum ha_rkey_function' */
36#include "my_inttypes.h"
37#include "my_sys.h" /* qsort2_cmp */
38
39/* Worst case tree is half full. This gives use 2^(MAX_TREE_HEIGHT/2) leafs */
40#define MAX_TREE_HEIGHT 64
41
42#define ELEMENT_KEY(tree, element) \
43 (tree->offset_to_key ? (void *)((uchar *)element + tree->offset_to_key) \
44 : *((void **)(element + 1)))
45
46#define tree_set_pointer(element, ptr) \
47 *((uchar **)(element + 1)) = ((uchar *)(ptr))
48
49#define TREE_NO_DUPS 1
50
53typedef int (*tree_walk_action)(void *, element_count, void *);
54
56typedef void (*tree_element_free)(void *, TREE_FREE, const void *);
57
60
61 TREE_ELEMENT *left{nullptr}, *right{nullptr};
62 uint32 count : 31, colour : 1; /* black is marked as 1 */
63};
64
65#define ELEMENT_CHILD(element, offs) \
66 (*(TREE_ELEMENT **)((char *)element + offs))
67
68struct TREE {
72 ulong memory_limit{0}, allocated{0};
74 const void *custom_arg{nullptr};
76 bool with_delete{false};
78 uint flag{0};
79};
80
81/* Functions on whole tree */
82void init_tree(TREE *tree, ulong memory_limit, int element_size,
83 qsort2_cmp compare, bool with_delete,
84 tree_element_free free_element, const void *custom_arg);
85void delete_tree(TREE *);
86void reset_tree(TREE *);
87/* similar to delete tree, except we do not my_free() blocks in mem_root
88 */
89inline bool is_tree_inited(TREE *tree) { return tree->root != nullptr; }
90
91/* Functions on leafs */
92TREE_ELEMENT *tree_insert(TREE *tree, void *key, uint key_size,
93 const void *custom_arg);
94void *tree_search(TREE *tree, void *key, const void *custom_arg);
95int tree_walk(TREE *tree, tree_walk_action action, void *argument,
96 TREE_WALK visit);
97int tree_delete(TREE *tree, void *key, uint key_size, const void *custom_arg);
98void *tree_search_key(TREE *tree, const void *key, TREE_ELEMENT **parents,
99 TREE_ELEMENT ***last_pos, enum ha_rkey_function flag,
100 const void *custom_arg);
101void *tree_search_edge(TREE *tree, TREE_ELEMENT **parents,
102 TREE_ELEMENT ***last_pos, int child_offs);
103void *tree_search_next(TREE *tree, TREE_ELEMENT ***last_pos, int l_offs,
104 int r_offs);
105ha_rows tree_record_pos(TREE *tree, const void *key,
106 enum ha_rkey_function search_flag,
107 const void *custom_arg);
108
109#define TREE_ELEMENT_EXTRA_SIZE (sizeof(TREE_ELEMENT) + sizeof(void *))
110
111#endif
int(* qsort2_cmp)(const void *, const void *, const void *)
Definition: my_sys.h:473
static int flag
Definition: hp_test1.cc:40
This file follows Google coding style, except for the name MEM_ROOT (which is kept for historical rea...
This file includes constants used by all storage engines.
ha_rkey_function
Definition: my_base.h:78
my_off_t ha_rows
Definition: my_base.h:1141
Some integer typedefs for easier portability.
uint32_t uint32
Definition: my_inttypes.h:67
Common header for many mysys elements.
TREE_WALK
Definition: my_tree.h:51
@ right_root_left
Definition: my_tree.h:51
@ left_root_right
Definition: my_tree.h:51
void * tree_search_next(TREE *tree, TREE_ELEMENT ***last_pos, int l_offs, int r_offs)
Definition: tree.cc:421
void init_tree(TREE *tree, ulong memory_limit, int element_size, qsort2_cmp compare, bool with_delete, tree_element_free free_element, const void *custom_arg)
Definition: tree.cc:104
void * tree_search_edge(TREE *tree, TREE_ELEMENT **parents, TREE_ELEMENT ***last_pos, int child_offs)
Definition: tree.cc:407
void * tree_search_key(TREE *tree, const void *key, TREE_ELEMENT **parents, TREE_ELEMENT ***last_pos, enum ha_rkey_function flag, const void *custom_arg)
Definition: tree.cc:333
int tree_walk(TREE *tree, tree_walk_action action, void *argument, TREE_WALK visit)
Definition: tree.cc:489
TREE_ELEMENT * tree_insert(TREE *tree, void *key, uint key_size, const void *custom_arg)
Definition: tree.cc:201
ha_rows tree_record_pos(TREE *tree, const void *key, enum ha_rkey_function search_flag, const void *custom_arg)
Definition: tree.cc:447
bool is_tree_inited(TREE *tree)
Definition: my_tree.h:89
void reset_tree(TREE *)
Definition: tree.cc:174
int tree_delete(TREE *tree, void *key, uint key_size, const void *custom_arg)
Definition: tree.cc:265
void delete_tree(TREE *)
Definition: tree.cc:170
int(* tree_walk_action)(void *, element_count, void *)
Definition: my_tree.h:53
#define MAX_TREE_HEIGHT
Definition: my_tree.h:40
void * tree_search(TREE *tree, void *key, const void *custom_arg)
Definition: tree.cc:317
uint32 element_count
Definition: my_tree.h:52
void(* tree_element_free)(void *, TREE_FREE, const void *)
Definition: my_tree.h:56
TREE_FREE
Definition: my_tree.h:55
@ free_init
Definition: my_tree.h:55
@ free_free
Definition: my_tree.h:55
@ free_end
Definition: my_tree.h:55
required string key
Definition: replication_asynchronous_connection_failover.proto:60
repeated Action action
Definition: replication_group_member_actions.proto:43
static int compare(size_t a, size_t b)
Function to compare two size_t integers for their relative order.
Definition: rpl_utility.cc:107
The MEM_ROOT is a simple arena, where allocations are carved out of larger blocks.
Definition: my_alloc.h:83
Definition: my_tree.h:58
uint32 colour
Definition: my_tree.h:62
TREE_ELEMENT * right
Definition: my_tree.h:61
TREE_ELEMENT()
Definition: my_tree.h:59
uint32 count
Definition: my_tree.h:62
TREE_ELEMENT * left
Definition: my_tree.h:61
Definition: my_tree.h:68
TREE_ELEMENT * root
Definition: my_tree.h:69
TREE_ELEMENT null_element
Definition: my_tree.h:69
TREE_ELEMENT ** parents[MAX_TREE_HEIGHT]
Definition: my_tree.h:70
tree_element_free free
Definition: my_tree.h:77
uint flag
Definition: my_tree.h:78
qsort2_cmp compare
Definition: my_tree.h:73
uint elements_in_tree
Definition: my_tree.h:71
ulong memory_limit
Definition: my_tree.h:72
bool with_delete
Definition: my_tree.h:76
uint offset_to_key
Definition: my_tree.h:71
uint size_of_element
Definition: my_tree.h:71
ulong allocated
Definition: my_tree.h:72
const void * custom_arg
Definition: my_tree.h:74
MEM_ROOT mem_root
Definition: my_tree.h:75