1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
|
/*
* Copyright © 2009,2012 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*
* Authors:
* Eric Anholt <eric@anholt.net>
*
*/
#ifndef _HASH_TABLE_H
#define _HASH_TABLE_H
#include <stdlib.h>
#include <inttypes.h>
#include <stdbool.h>
#include "c99_compat.h"
#include "macros.h"
#ifdef __cplusplus
extern "C" {
#endif
struct hash_entry {
uint32_t hash;
const void *key;
void *data;
};
struct hash_table {
struct hash_entry *table;
uint32_t (*key_hash_function)(const void *key);
bool (*key_equals_function)(const void *a, const void *b);
const void *deleted_key;
uint32_t size;
uint32_t rehash;
uint32_t max_entries;
uint32_t size_index;
uint32_t entries;
uint32_t deleted_entries;
};
struct hash_table *
_mesa_hash_table_create(void *mem_ctx,
uint32_t (*key_hash_function)(const void *key),
bool (*key_equals_function)(const void *a,
const void *b));
void _mesa_hash_table_destroy(struct hash_table *ht,
void (*delete_function)(struct hash_entry *entry));
void _mesa_hash_table_clear(struct hash_table *ht,
void (*delete_function)(struct hash_entry *entry));
void _mesa_hash_table_set_deleted_key(struct hash_table *ht,
const void *deleted_key);
static inline uint32_t _mesa_hash_table_num_entries(struct hash_table *ht)
{
return ht->entries;
}
struct hash_entry *
_mesa_hash_table_insert(struct hash_table *ht, const void *key, void *data);
struct hash_entry *
_mesa_hash_table_insert_pre_hashed(struct hash_table *ht, uint32_t hash,
const void *key, void *data);
struct hash_entry *
_mesa_hash_table_search(struct hash_table *ht, const void *key);
struct hash_entry *
_mesa_hash_table_search_pre_hashed(struct hash_table *ht, uint32_t hash,
const void *key);
void _mesa_hash_table_remove(struct hash_table *ht,
struct hash_entry *entry);
struct hash_entry *_mesa_hash_table_next_entry(struct hash_table *ht,
struct hash_entry *entry);
struct hash_entry *
_mesa_hash_table_random_entry(struct hash_table *ht,
bool (*predicate)(struct hash_entry *entry));
uint32_t _mesa_hash_data(const void *data, size_t size);
uint32_t _mesa_hash_string(const char *key);
bool _mesa_key_string_equal(const void *a, const void *b);
bool _mesa_key_pointer_equal(const void *a, const void *b);
static inline uint32_t _mesa_key_hash_string(const void *key)
{
return _mesa_hash_string((const char *)key);
}
static inline uint32_t _mesa_hash_pointer(const void *pointer)
{
uintptr_t num = (uintptr_t) pointer;
return (uint32_t) ((num >> 2) ^ (num >> 6) ^ (num >> 10) ^ (num >> 14));
}
enum {
_mesa_fnv32_1a_offset_bias = 2166136261u,
};
static inline uint32_t
_mesa_fnv32_1a_accumulate_block(uint32_t hash, const void *data, size_t size)
{
const uint8_t *bytes = (const uint8_t *)data;
while (size-- != 0) {
hash ^= *bytes;
hash = hash * 0x01000193;
bytes++;
}
return hash;
}
#define _mesa_fnv32_1a_accumulate(hash, expr) \
_mesa_fnv32_1a_accumulate_block(hash, &(expr), sizeof(expr))
/**
* This foreach function is safe against deletion (which just replaces
* an entry's data with the deleted marker), but not against insertion
* (which may rehash the table, making entry a dangling pointer).
*/
#define hash_table_foreach(ht, entry) \
for (entry = _mesa_hash_table_next_entry(ht, NULL); \
entry != NULL; \
entry = _mesa_hash_table_next_entry(ht, entry))
static inline void
hash_table_call_foreach(struct hash_table *ht,
void (*callback)(const void *key,
void *data,
void *closure),
void *closure)
{
struct hash_entry *entry;
hash_table_foreach(ht, entry)
callback(entry->key, entry->data, closure);
}
/**
* Hash table wrapper which supports 64-bit keys.
*/
struct hash_table_u64 {
struct hash_table *table;
void *deleted_key_data;
};
struct hash_table_u64 *
_mesa_hash_table_u64_create(void *mem_ctx);
void
_mesa_hash_table_u64_destroy(struct hash_table_u64 *ht,
void (*delete_function)(struct hash_entry *entry));
void
_mesa_hash_table_u64_insert(struct hash_table_u64 *ht, uint64_t key,
void *data);
void *
_mesa_hash_table_u64_search(struct hash_table_u64 *ht, uint64_t key);
void
_mesa_hash_table_u64_remove(struct hash_table_u64 *ht, uint64_t key);
#ifdef __cplusplus
} /* extern C */
#endif
#endif /* _HASH_TABLE_H */
|
