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upload-pack: express constants in terms of the_hash_algo
[git/debian.git] / khash.h
blob07b4cc2e6714598ef920dcf28b8f73ba34979677
1 /* The MIT License
2
3 Copyright (c) 2008, 2009, 2011 by Attractive Chaos <attractor@live.co.uk>
4
5 Permission is hereby granted, free of charge, to any person obtaining
6 a copy of this software and associated documentation files (the
7 "Software"), to deal in the Software without restriction, including
8 without limitation the rights to use, copy, modify, merge, publish,
9 distribute, sublicense, and/or sell copies of the Software, and to
10 permit persons to whom the Software is furnished to do so, subject to
11 the following conditions:
12
13 The above copyright notice and this permission notice shall be
14 included in all copies or substantial portions of the Software.
15
16 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
17 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
18 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
19 NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
20 BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
21 ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
22 CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
23 SOFTWARE.
24 */
25
26 #ifndef __AC_KHASH_H
27 #define __AC_KHASH_H
28
29 #include "cache.h"
30 #include "hashmap.h"
31
32 #define AC_VERSION_KHASH_H "0.2.8"
33
34 typedef uint32_t khint32_t;
35 typedef uint64_t khint64_t;
36
37 typedef khint32_t khint_t;
38 typedef khint_t khiter_t;
39
40 #define __ac_isempty(flag, i) ((flag[i>>4]>>((i&0xfU)<<1))&2)
41 #define __ac_isdel(flag, i) ((flag[i>>4]>>((i&0xfU)<<1))&1)
42 #define __ac_iseither(flag, i) ((flag[i>>4]>>((i&0xfU)<<1))&3)
43 #define __ac_set_isdel_false(flag, i) (flag[i>>4]&=~(1ul<<((i&0xfU)<<1)))
44 #define __ac_set_isempty_false(flag, i) (flag[i>>4]&=~(2ul<<((i&0xfU)<<1)))
45 #define __ac_set_isboth_false(flag, i) (flag[i>>4]&=~(3ul<<((i&0xfU)<<1)))
46 #define __ac_set_isdel_true(flag, i) (flag[i>>4]|=1ul<<((i&0xfU)<<1))
47
48 #define __ac_fsize(m) ((m) < 16? 1 : (m)>>4)
49
50 #define kroundup32(x) (--(x), (x)|=(x)>>1, (x)|=(x)>>2, (x)|=(x)>>4, (x)|=(x)>>8, (x)|=(x)>>16, ++(x))
51
52 static inline khint_t __ac_X31_hash_string(const char *s)
53 {
54 khint_t h = (khint_t)*s;
55 if (h) for (++s ; *s; ++s) h = (h << 5) - h + (khint_t)*s;
56 return h;
57 }
58
59 #define kh_str_hash_func(key) __ac_X31_hash_string(key)
60 #define kh_str_hash_equal(a, b) (strcmp(a, b) == 0)
61
62 static const double __ac_HASH_UPPER = 0.77;
63
64 #define __KHASH_TYPE(name, khkey_t, khval_t) \
65 typedef struct { \
66 khint_t n_buckets, size, n_occupied, upper_bound; \
67 khint32_t *flags; \
68 khkey_t *keys; \
69 khval_t *vals; \
70 } kh_##name##_t;
71
72 #define __KHASH_PROTOTYPES(name, khkey_t, khval_t) \
73 extern kh_##name##_t *kh_init_##name(void); \
74 extern void kh_destroy_##name(kh_##name##_t *h); \
75 extern void kh_clear_##name(kh_##name##_t *h); \
76 extern khint_t kh_get_##name(const kh_##name##_t *h, khkey_t key); \
77 extern int kh_resize_##name(kh_##name##_t *h, khint_t new_n_buckets); \
78 extern khint_t kh_put_##name(kh_##name##_t *h, khkey_t key, int *ret); \
79 extern void kh_del_##name(kh_##name##_t *h, khint_t x);
80
81 #define __KHASH_IMPL(name, SCOPE, khkey_t, khval_t, kh_is_map, __hash_func, __hash_equal) \
82 SCOPE kh_##name##_t *kh_init_##name(void) { \
83 return (kh_##name##_t*)xcalloc(1, sizeof(kh_##name##_t)); \
84 } \
85 SCOPE void kh_destroy_##name(kh_##name##_t *h) \
86 { \
87 if (h) { \
88 free((void *)h->keys); free(h->flags); \
89 free((void *)h->vals); \
90 free(h); \
91 } \
92 } \
93 SCOPE void kh_clear_##name(kh_##name##_t *h) \
94 { \
95 if (h && h->flags) { \
96 memset(h->flags, 0xaa, __ac_fsize(h->n_buckets) * sizeof(khint32_t)); \
97 h->size = h->n_occupied = 0; \
98 } \
99 } \
100 SCOPE khint_t kh_get_##name(const kh_##name##_t *h, khkey_t key) \
101 { \
102 if (h->n_buckets) { \
103 khint_t k, i, last, mask, step = 0; \
104 mask = h->n_buckets - 1; \
105 k = __hash_func(key); i = k & mask; \
106 last = i; \
107 while (!__ac_isempty(h->flags, i) && (__ac_isdel(h->flags, i) || !__hash_equal(h->keys[i], key))) { \
108 i = (i + (++step)) & mask; \
109 if (i == last) return h->n_buckets; \
110 } \
111 return __ac_iseither(h->flags, i)? h->n_buckets : i; \
112 } else return 0; \
113 } \
114 SCOPE int kh_resize_##name(kh_##name##_t *h, khint_t new_n_buckets) \
115 { /* This function uses 0.25*n_buckets bytes of working space instead of [sizeof(key_t+val_t)+.25]*n_buckets. */ \
116 khint32_t *new_flags = NULL; \
117 khint_t j = 1; \
118 { \
119 kroundup32(new_n_buckets); \
120 if (new_n_buckets < 4) new_n_buckets = 4; \
121 if (h->size >= (khint_t)(new_n_buckets * __ac_HASH_UPPER + 0.5)) j = 0; /* requested size is too small */ \
122 else { /* hash table size to be changed (shrink or expand); rehash */ \
123 ALLOC_ARRAY(new_flags, __ac_fsize(new_n_buckets)); \
124 if (!new_flags) return -1; \
125 memset(new_flags, 0xaa, __ac_fsize(new_n_buckets) * sizeof(khint32_t)); \
126 if (h->n_buckets < new_n_buckets) { /* expand */ \
127 REALLOC_ARRAY(h->keys, new_n_buckets); \
128 if (kh_is_map) { \
129 REALLOC_ARRAY(h->vals, new_n_buckets); \
130 } \
131 } /* otherwise shrink */ \
132 } \
133 } \
134 if (j) { /* rehashing is needed */ \
135 for (j = 0; j != h->n_buckets; ++j) { \
136 if (__ac_iseither(h->flags, j) == 0) { \
137 khkey_t key = h->keys[j]; \
138 khval_t val; \
139 khint_t new_mask; \
140 new_mask = new_n_buckets - 1; \
141 if (kh_is_map) val = h->vals[j]; \
142 __ac_set_isdel_true(h->flags, j); \
143 while (1) { /* kick-out process; sort of like in Cuckoo hashing */ \
144 khint_t k, i, step = 0; \
145 k = __hash_func(key); \
146 i = k & new_mask; \
147 while (!__ac_isempty(new_flags, i)) i = (i + (++step)) & new_mask; \
148 __ac_set_isempty_false(new_flags, i); \
149 if (i < h->n_buckets && __ac_iseither(h->flags, i) == 0) { /* kick out the existing element */ \
150 { khkey_t tmp = h->keys[i]; h->keys[i] = key; key = tmp; } \
151 if (kh_is_map) { khval_t tmp = h->vals[i]; h->vals[i] = val; val = tmp; } \
152 __ac_set_isdel_true(h->flags, i); /* mark it as deleted in the old hash table */ \
153 } else { /* write the element and jump out of the loop */ \
154 h->keys[i] = key; \
155 if (kh_is_map) h->vals[i] = val; \
156 break; \
157 } \
158 } \
159 } \
160 } \
161 if (h->n_buckets > new_n_buckets) { /* shrink the hash table */ \
162 REALLOC_ARRAY(h->keys, new_n_buckets); \
163 if (kh_is_map) REALLOC_ARRAY(h->vals, new_n_buckets); \
164 } \
165 free(h->flags); /* free the working space */ \
166 h->flags = new_flags; \
167 h->n_buckets = new_n_buckets; \
168 h->n_occupied = h->size; \
169 h->upper_bound = (khint_t)(h->n_buckets * __ac_HASH_UPPER + 0.5); \
170 } \
171 return 0; \
172 } \
173 SCOPE khint_t kh_put_##name(kh_##name##_t *h, khkey_t key, int *ret) \
174 { \
175 khint_t x; \
176 if (h->n_occupied >= h->upper_bound) { /* update the hash table */ \
177 if (h->n_buckets > (h->size<<1)) { \
178 if (kh_resize_##name(h, h->n_buckets - 1) < 0) { /* clear "deleted" elements */ \
179 *ret = -1; return h->n_buckets; \
180 } \
181 } else if (kh_resize_##name(h, h->n_buckets + 1) < 0) { /* expand the hash table */ \
182 *ret = -1; return h->n_buckets; \
183 } \
184 } /* TODO: to implement automatically shrinking; resize() already support shrinking */ \
185 { \
186 khint_t k, i, site, last, mask = h->n_buckets - 1, step = 0; \
187 x = site = h->n_buckets; k = __hash_func(key); i = k & mask; \
188 if (__ac_isempty(h->flags, i)) x = i; /* for speed up */ \
189 else { \
190 last = i; \
191 while (!__ac_isempty(h->flags, i) && (__ac_isdel(h->flags, i) || !__hash_equal(h->keys[i], key))) { \
192 if (__ac_isdel(h->flags, i)) site = i; \
193 i = (i + (++step)) & mask; \
194 if (i == last) { x = site; break; } \
195 } \
196 if (x == h->n_buckets) { \
197 if (__ac_isempty(h->flags, i) && site != h->n_buckets) x = site; \
198 else x = i; \
199 } \
200 } \
201 } \
202 if (__ac_isempty(h->flags, x)) { /* not present at all */ \
203 h->keys[x] = key; \
204 __ac_set_isboth_false(h->flags, x); \
205 ++h->size; ++h->n_occupied; \
206 *ret = 1; \
207 } else if (__ac_isdel(h->flags, x)) { /* deleted */ \
208 h->keys[x] = key; \
209 __ac_set_isboth_false(h->flags, x); \
210 ++h->size; \
211 *ret = 2; \
212 } else *ret = 0; /* Don't touch h->keys[x] if present and not deleted */ \
213 return x; \
214 } \
215 SCOPE void kh_del_##name(kh_##name##_t *h, khint_t x) \
216 { \
217 if (x != h->n_buckets && !__ac_iseither(h->flags, x)) { \
218 __ac_set_isdel_true(h->flags, x); \
219 --h->size; \
220 } \
221 }
222
223 #define KHASH_DECLARE(name, khkey_t, khval_t) \
224 __KHASH_TYPE(name, khkey_t, khval_t) \
225 __KHASH_PROTOTYPES(name, khkey_t, khval_t)
226
227 #define KHASH_INIT2(name, SCOPE, khkey_t, khval_t, kh_is_map, __hash_func, __hash_equal) \
228 __KHASH_TYPE(name, khkey_t, khval_t) \
229 __KHASH_IMPL(name, SCOPE, khkey_t, khval_t, kh_is_map, __hash_func, __hash_equal)
230
231 #define KHASH_INIT(name, khkey_t, khval_t, kh_is_map, __hash_func, __hash_equal) \
232 KHASH_INIT2(name, static inline, khkey_t, khval_t, kh_is_map, __hash_func, __hash_equal)
233
234 /* Other convenient macros... */
235
236 /*! @function
237 @abstract Test whether a bucket contains data.
238 @param h Pointer to the hash table [khash_t(name)*]
239 @param x Iterator to the bucket [khint_t]
240 @return 1 if containing data; 0 otherwise [int]
241 */
242 #define kh_exist(h, x) (!__ac_iseither((h)->flags, (x)))
243
244 /*! @function
245 @abstract Get key given an iterator
246 @param h Pointer to the hash table [khash_t(name)*]
247 @param x Iterator to the bucket [khint_t]
248 @return Key [type of keys]
249 */
250 #define kh_key(h, x) ((h)->keys[x])
251
252 /*! @function
253 @abstract Get value given an iterator
254 @param h Pointer to the hash table [khash_t(name)*]
255 @param x Iterator to the bucket [khint_t]
256 @return Value [type of values]
257 @discussion For hash sets, calling this results in segfault.
258 */
259 #define kh_val(h, x) ((h)->vals[x])
260
261 /*! @function
262 @abstract Alias of kh_val()
263 */
264 #define kh_value(h, x) ((h)->vals[x])
265
266 /*! @function
267 @abstract Get the start iterator
268 @param h Pointer to the hash table [khash_t(name)*]
269 @return The start iterator [khint_t]
270 */
271 #define kh_begin(h) (khint_t)(0)
272
273 /*! @function
274 @abstract Get the end iterator
275 @param h Pointer to the hash table [khash_t(name)*]
276 @return The end iterator [khint_t]
277 */
278 #define kh_end(h) ((h)->n_buckets)
279
280 /*! @function
281 @abstract Get the number of elements in the hash table
282 @param h Pointer to the hash table [khash_t(name)*]
283 @return Number of elements in the hash table [khint_t]
284 */
285 #define kh_size(h) ((h)->size)
286
287 /*! @function
288 @abstract Get the number of buckets in the hash table
289 @param h Pointer to the hash table [khash_t(name)*]
290 @return Number of buckets in the hash table [khint_t]
291 */
292 #define kh_n_buckets(h) ((h)->n_buckets)
293
294 /*! @function
295 @abstract Iterate over the entries in the hash table
296 @param h Pointer to the hash table [khash_t(name)*]
297 @param kvar Variable to which key will be assigned
298 @param vvar Variable to which value will be assigned
299 @param code Block of code to execute
300 */
301 #define kh_foreach(h, kvar, vvar, code) { khint_t __i; \
302 for (__i = kh_begin(h); __i != kh_end(h); ++__i) { \
303 if (!kh_exist(h,__i)) continue; \
304 (kvar) = kh_key(h,__i); \
305 (vvar) = kh_val(h,__i); \
306 code; \
307 } }
308
309 /*! @function
310 @abstract Iterate over the values in the hash table
311 @param h Pointer to the hash table [khash_t(name)*]
312 @param vvar Variable to which value will be assigned
313 @param code Block of code to execute
314 */
315 #define kh_foreach_value(h, vvar, code) { khint_t __i; \
316 for (__i = kh_begin(h); __i != kh_end(h); ++__i) { \
317 if (!kh_exist(h,__i)) continue; \
318 (vvar) = kh_val(h,__i); \
319 code; \
320 } }
321
322 #define __kh_oid_cmp(a, b) (hashcmp(a, b) == 0)
323
324 KHASH_INIT(sha1, const unsigned char *, void *, 1, sha1hash, __kh_oid_cmp)
325 typedef kh_sha1_t khash_sha1;
326
327 KHASH_INIT(sha1_pos, const unsigned char *, int, 1, sha1hash, __kh_oid_cmp)
328 typedef kh_sha1_pos_t khash_sha1_pos;
329
330 #endif /* __AC_KHASH_H */
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