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
|
/*
* Copyright (c) 2015 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef included_clib_mhash_h
#define included_clib_mhash_h
/*
Copyright (c) 2010 Eliot Dresselhaus
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 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.
*/
#include <vppinfra/format.h>
#include <vppinfra/hash.h>
#include <vppinfra/heap.h>
/* Hash table plus vector of keys. */
typedef struct
{
/* Vector or heap used to store keys. Hash table stores keys as byte
offsets into this vector. */
u8 *key_vector_or_heap;
/* Byte offsets of free keys in vector (used to store free keys when
n_key_bytes > 1). */
u32 *key_vector_free_indices;
u8 **key_tmps;
/* Possibly fixed size of key.
0 means keys are vectors of u8's.
1 means keys are null terminated c strings. */
#define MHASH_VEC_STRING_KEY 0
#define MHASH_C_STRING_KEY 1
u32 n_key_bytes;
/* Seed value for Jenkins hash. */
u32 hash_seed;
/* Hash table mapping key -> value. */
uword *hash;
/* Format function for keys. */
format_function_t *format_key;
} mhash_t;
void mhash_init (mhash_t * h, uword n_value_bytes, uword n_key_bytes);
always_inline void
mhash_init_c_string (mhash_t * h, uword n_value_bytes)
{
mhash_init (h, n_value_bytes, MHASH_C_STRING_KEY);
}
always_inline void
mhash_init_vec_string (mhash_t * h, uword n_value_bytes)
{
mhash_init (h, n_value_bytes, MHASH_VEC_STRING_KEY);
}
always_inline void *
mhash_key_to_mem (mhash_t * h, uword key)
{
if (key == ~0)
{
u8 *key_tmp;
int my_cpu = os_get_thread_index ();
vec_validate (h->key_tmps, my_cpu);
key_tmp = h->key_tmps[my_cpu];
return key_tmp;
}
return vec_elt_at_index (h->key_vector_or_heap, key);
}
hash_pair_t *mhash_get_pair (mhash_t * h, const void *key);
uword mhash_set_mem (mhash_t * h, void *key, uword * new_value,
uword * old_value);
uword mhash_unset (mhash_t * h, void *key, uword * old_value);
always_inline uword *
mhash_get (mhash_t * h, const void *key)
{
hash_pair_t *p = mhash_get_pair (h, key);
return p ? &p->value[0] : 0;
}
always_inline uword
mhash_set (mhash_t * h, void *key, uword new_value, uword * old_value)
{
return mhash_set_mem (h, key, &new_value, old_value);
}
always_inline uword
mhash_unset_key (mhash_t * h, uword key, uword * old_value)
{
void *k = mhash_key_to_mem (h, key);
return mhash_unset (h, k, old_value);
}
always_inline uword
mhash_value_bytes (mhash_t * m)
{
hash_t *h = hash_header (m->hash);
return hash_value_bytes (h);
}
always_inline uword
mhash_elts (mhash_t * m)
{
return hash_elts (m->hash);
}
always_inline uword
mhash_key_vector_is_heap (mhash_t * h)
{
return h->n_key_bytes <= 1;
}
always_inline void
mhash_free (mhash_t * h)
{
if (mhash_key_vector_is_heap (h))
heap_free (h->key_vector_or_heap);
else
vec_free (h->key_vector_or_heap);
vec_free (h->key_vector_free_indices);
hash_free (h->hash);
}
#define mhash_foreach(k,v,mh,body) \
do { \
hash_pair_t * _mhash_foreach_p; \
hash_foreach_pair (_mhash_foreach_p, (mh)->hash, ({ \
(k) = mhash_key_to_mem ((mh), _mhash_foreach_p->key); \
(v) = &_mhash_foreach_p->value[0]; \
body; \
})); \
} while (0)
u8 *format_mhash (u8 *s, va_list *va);
format_function_t format_mhash_key;
/* Main test routine. */
int test_mhash_main (unformat_input_t *input);
#endif /* included_clib_mhash_h */
/*
* fd.io coding-style-patch-verification: ON
*
* Local Variables:
* eval: (c-set-style "gnu")
* End:
*/
|
