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1/*␊
2Copyright (c) 2003-2011, Troy D. Hanson http://uthash.sourceforge.net␊
3All rights reserved.␊
4␊
5Redistribution and use in source and binary forms, with or without␊
6modification, are permitted provided that the following conditions are met:␊
7␊
8 * Redistributions of source code must retain the above copyright␊
9 notice, this list of conditions and the following disclaimer.␊
10␊
11THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS␊
12IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED␊
13TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A␊
14PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER␊
15OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,␊
16EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,␊
17PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR␊
18PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF␊
19LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING␊
20NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS␊
21SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.␊
22*/␊
23␊
24#ifndef UTHASH_H␊
25#define UTHASH_H ␊
26␊
27#include "libsaio.h"␊
28␊
29/* These macros use decltype or the earlier __typeof GNU extension.␊
30 As decltype is only available in newer compilers (VS2010 or gcc 4.3+␊
31 when compiling c++ source) this code uses whatever method is needed␊
32 or, for VS2008 where neither is available, uses casting workarounds. */␊
33#ifdef _MSC_VER /* MS compiler */␊
34#if _MSC_VER >= 1600 && defined(__cplusplus) /* VS2010 or newer in C++ mode */␊
35#define DECLTYPE(x) (decltype(x))␊
36#else /* VS2008 or older (or VS2010 in C mode) */␊
37#define NO_DECLTYPE␊
38#define DECLTYPE(x)␊
39#endif␊
40#else /* GNU, Sun and other compilers */␊
41#define DECLTYPE(x) (__typeof(x))␊
42#endif␊
43␊
44#ifdef NO_DECLTYPE␊
45#define DECLTYPE_ASSIGN(dst,src) \␊
46do { \␊
47 char **_da_dst = (char**)(&(dst)); \␊
48 *_da_dst = (char*)(src); \␊
49} while(0)␊
50#else ␊
51#define DECLTYPE_ASSIGN(dst,src) \␊
52do { \␊
53 (dst) = DECLTYPE(dst)(src); \␊
54} while(0)␊
55#endif␊
56␊
57#define UTHASH_VERSION 1.9.4␊
58␊
59#define uthash_fatal(msg) longjmp(h_buf_error,-1) /* fatal error (out of memory,etc) */␊
60#define uthash_malloc(sz) malloc(sz) /* malloc fcn */␊
61#define uthash_free(ptr,sz) free(ptr) /* free fcn */␊
62␊
63#define uthash_noexpand_fyi(tbl) /* can be defined to log noexpand */␊
64#define uthash_expand_fyi(tbl) /* can be defined to log expands */␊
65␊
66/* initial number of buckets */␊
67#define HASH_INITIAL_NUM_BUCKETS 32 /* initial number of buckets */␊
68#define HASH_INITIAL_NUM_BUCKETS_LOG2 5 /* lg2 of initial number of buckets */␊
69#define HASH_BKT_CAPACITY_THRESH 10 /* expand when bucket count reaches */␊
70␊
71/* calculate the element whose hash handle address is hhe */␊
72#define ELMT_FROM_HH(tbl,hhp) ((void*)(((char*)(hhp)) - ((tbl)->hho)))␊
73␊
74#define HASH_FIND(hh,head,keyptr,keylen,out) \␊
75do { \␊
76 unsigned _hf_bkt,_hf_hashv; \␊
77 out=NULL; \␊
78 if (head) { \␊
79 HASH_FCN(keyptr,keylen, (head)->hh.tbl->num_buckets, _hf_hashv, _hf_bkt); \␊
80 if (HASH_BLOOM_TEST((head)->hh.tbl, _hf_hashv)) { \␊
81 HASH_FIND_IN_BKT((head)->hh.tbl, hh, (head)->hh.tbl->buckets[ _hf_bkt ], \␊
82 keyptr,keylen,out); \␊
83 } \␊
84 } \␊
85} while (0)␊
86␊
87#ifdef HASH_BLOOM␊
88#define HASH_BLOOM_BITLEN (1ULL << HASH_BLOOM)␊
89#define HASH_BLOOM_BYTELEN (HASH_BLOOM_BITLEN/8) + ((HASH_BLOOM_BITLEN%8) ? 1:0)␊
90#define HASH_BLOOM_MAKE(tbl) \␊
91do { \␊
92 (tbl)->bloom_nbits = HASH_BLOOM; \␊
93 (tbl)->bloom_bv = (uint8_t*)uthash_malloc(HASH_BLOOM_BYTELEN); \␊
94 if (!((tbl)->bloom_bv)) { uthash_fatal( "out of memory"); } \␊
95 memset((tbl)->bloom_bv, 0, HASH_BLOOM_BYTELEN); \␊
96 (tbl)->bloom_sig = HASH_BLOOM_SIGNATURE; \␊
97} while (0);␊
98␊
99#define HASH_BLOOM_FREE(tbl) \␊
100do { \␊
101 uthash_free((tbl)->bloom_bv, HASH_BLOOM_BYTELEN); \␊
102} while (0);␊
103␊
104#define HASH_BLOOM_BITSET(bv,idx) (bv[(idx)/8] |= (1U << ((idx)%8)))␊
105#define HASH_BLOOM_BITTEST(bv,idx) (bv[(idx)/8] & (1U << ((idx)%8)))␊
106␊
107#define HASH_BLOOM_ADD(tbl,hashv) \␊
108 HASH_BLOOM_BITSET((tbl)->bloom_bv, (hashv & (uint32_t)((1ULL << (tbl)->bloom_nbits) - 1)))␊
109␊
110#define HASH_BLOOM_TEST(tbl,hashv) \␊
111 HASH_BLOOM_BITTEST((tbl)->bloom_bv, (hashv & (uint32_t)((1ULL << (tbl)->bloom_nbits) - 1)))␊
112␊
113#else␊
114#define HASH_BLOOM_MAKE(tbl) ␊
115#define HASH_BLOOM_FREE(tbl) ␊
116#define HASH_BLOOM_ADD(tbl,hashv) ␊
117#define HASH_BLOOM_TEST(tbl,hashv) (1)␊
118#endif␊
119␊
120#define HASH_MAKE_TABLE(hh,head) \␊
121do { \␊
122 (head)->hh.tbl = (UT_hash_table*)uthash_malloc( \␊
123 sizeof(UT_hash_table)); \␊
124 if (!((head)->hh.tbl)) { uthash_fatal( "out of memory"); } \␊
125 memset((head)->hh.tbl, 0, sizeof(UT_hash_table)); \␊
126 (head)->hh.tbl->tail = &((head)->hh); \␊
127 (head)->hh.tbl->num_buckets = HASH_INITIAL_NUM_BUCKETS; \␊
128 (head)->hh.tbl->log2_num_buckets = HASH_INITIAL_NUM_BUCKETS_LOG2; \␊
129 (head)->hh.tbl->hho = (char*)(&(head)->hh) - (char*)(head); \␊
130 (head)->hh.tbl->buckets = (UT_hash_bucket*)uthash_malloc( \␊
131 HASH_INITIAL_NUM_BUCKETS*sizeof(struct UT_hash_bucket)); \␊
132 if (! (head)->hh.tbl->buckets) { uthash_fatal( "out of memory"); } \␊
133 memset((head)->hh.tbl->buckets, 0, \␊
134 HASH_INITIAL_NUM_BUCKETS*sizeof(struct UT_hash_bucket)); \␊
135 HASH_BLOOM_MAKE((head)->hh.tbl); \␊
136 (head)->hh.tbl->signature = HASH_SIGNATURE; \␊
137} while(0)␊
138␊
139#define HASH_ADD(hh,head,fieldname,keylen_in,add) \␊
140 HASH_ADD_KEYPTR(hh,head,&((add)->fieldname),keylen_in,add)␊
141 ␊
142#define HASH_ADD_KEYPTR(hh,head,keyptr,keylen_in,add) \␊
143do { \␊
144 unsigned _ha_bkt; \␊
145 (add)->hh.next = NULL; \␊
146 (add)->hh.key = (char*)keyptr; \␊
147 (add)->hh.keylen = keylen_in; \␊
148 if (!(head)) { \␊
149 head = (add); \␊
150 (head)->hh.prev = NULL; \␊
151 HASH_MAKE_TABLE(hh,head); \␊
152 } else { \␊
153 (head)->hh.tbl->tail->next = (add); \␊
154 (add)->hh.prev = ELMT_FROM_HH((head)->hh.tbl, (head)->hh.tbl->tail); \␊
155 (head)->hh.tbl->tail = &((add)->hh); \␊
156 } \␊
157 (head)->hh.tbl->num_items++; \␊
158 (add)->hh.tbl = (head)->hh.tbl; \␊
159 HASH_FCN(keyptr,keylen_in, (head)->hh.tbl->num_buckets, \␊
160 (add)->hh.hashv, _ha_bkt); \␊
161 HASH_ADD_TO_BKT((head)->hh.tbl->buckets[_ha_bkt],&(add)->hh); \␊
162 HASH_BLOOM_ADD((head)->hh.tbl,(add)->hh.hashv); \␊
163 HASH_EMIT_KEY(hh,head,keyptr,keylen_in); \␊
164 HASH_FSCK(hh,head); \␊
165} while(0)␊
166␊
167#define HASH_TO_BKT( hashv, num_bkts, bkt ) \␊
168do { \␊
169 bkt = ((hashv) & ((num_bkts) - 1)); \␊
170} while(0)␊
171␊
172/* delete "delptr" from the hash table.␊
173 * "the usual" patch-up process for the app-order doubly-linked-list.␊
174 * The use of _hd_hh_del below deserves special explanation.␊
175 * These used to be expressed using (delptr) but that led to a bug␊
176 * if someone used the same symbol for the head and deletee, like␊
177 * HASH_DELETE(hh,users,users);␊
178 * We want that to work, but by changing the head (users) below␊
179 * we were forfeiting our ability to further refer to the deletee (users)␊
180 * in the patch-up process. Solution: use scratch space to␊
181 * copy the deletee pointer, then the latter references are via that␊
182 * scratch pointer rather than through the repointed (users) symbol.␊
183 */␊
184#define HASH_DELETE(hh,head,delptr) \␊
185do { \␊
186 unsigned _hd_bkt; \␊
187 struct UT_hash_handle *_hd_hh_del; \␊
188 if ( ((delptr)->hh.prev == NULL) && ((delptr)->hh.next == NULL) ) { \␊
189 uthash_free((head)->hh.tbl->buckets, \␊
190 (head)->hh.tbl->num_buckets*sizeof(struct UT_hash_bucket) ); \␊
191 HASH_BLOOM_FREE((head)->hh.tbl); \␊
192 uthash_free((head)->hh.tbl, sizeof(UT_hash_table)); \␊
193 head = NULL; \␊
194 } else { \␊
195 _hd_hh_del = &((delptr)->hh); \␊
196 if ((delptr) == ELMT_FROM_HH((head)->hh.tbl,(head)->hh.tbl->tail)) { \␊
197 (head)->hh.tbl->tail = \␊
198 (UT_hash_handle*)((char*)((delptr)->hh.prev) + \␊
199 (head)->hh.tbl->hho); \␊
200 } \␊
201 if ((delptr)->hh.prev) { \␊
202 ((UT_hash_handle*)((char*)((delptr)->hh.prev) + \␊
203 (head)->hh.tbl->hho))->next = (delptr)->hh.next; \␊
204 } else { \␊
205 DECLTYPE_ASSIGN(head,(delptr)->hh.next); \␊
206 } \␊
207 if (_hd_hh_del->next) { \␊
208 ((UT_hash_handle*)((char*)_hd_hh_del->next + \␊
209 (head)->hh.tbl->hho))->prev = \␊
210 _hd_hh_del->prev; \␊
211 } \␊
212 HASH_TO_BKT( _hd_hh_del->hashv, (head)->hh.tbl->num_buckets, _hd_bkt); \␊
213 HASH_DEL_IN_BKT(hh,(head)->hh.tbl->buckets[_hd_bkt], _hd_hh_del); \␊
214 (head)->hh.tbl->num_items--; \␊
215 } \␊
216 HASH_FSCK(hh,head); \␊
217} while (0)␊
218␊
219␊
220/* convenience forms of HASH_FIND/HASH_ADD/HASH_DEL */␊
221#define HASH_FIND_STR(head,findstr,out) \␊
222 HASH_FIND(hh,head,findstr,strlen(findstr),out)␊
223#define HASH_ADD_STR(head,strfield,add) \␊
224 HASH_ADD(hh,head,strfield,strlen(add->strfield),add)␊
225#define HASH_FIND_INT(head,findint,out) \␊
226 HASH_FIND(hh,head,findint,sizeof(int),out)␊
227#define HASH_ADD_INT(head,intfield,add) \␊
228 HASH_ADD(hh,head,intfield,sizeof(int),add)␊
229#define HASH_FIND_PTR(head,findptr,out) \␊
230 HASH_FIND(hh,head,findptr,sizeof(void *),out)␊
231#define HASH_ADD_PTR(head,ptrfield,add) \␊
232 HASH_ADD(hh,head,ptrfield,sizeof(void *),add)␊
233#define HASH_DEL(head,delptr) \␊
234 HASH_DELETE(hh,head,delptr)␊
235␊
236/* HASH_FSCK checks hash integrity on every add/delete when HASH_DEBUG is defined.␊
237 * This is for uthash developer only; it compiles away if HASH_DEBUG isn't defined.␊
238 */␊
239#ifdef HASH_DEBUG␊
240#define HASH_OOPS(...) do { fprintf(stderr,__VA_ARGS__); longjmp(h_buf_error,-1); } while (0)␊
241#define HASH_FSCK(hh,head) \␊
242do { \␊
243 unsigned _bkt_i; \␊
244 unsigned _count, _bkt_count; \␊
245 char *_prev; \␊
246 struct UT_hash_handle *_thh; \␊
247 if (head) { \␊
248 _count = 0; \␊
249 for( _bkt_i = 0; _bkt_i < (head)->hh.tbl->num_buckets; _bkt_i++) { \␊
250 _bkt_count = 0; \␊
251 _thh = (head)->hh.tbl->buckets[_bkt_i].hh_head; \␊
252 _prev = NULL; \␊
253 while (_thh) { \␊
254 if (_prev != (char*)(_thh->hh_prev)) { \␊
255 HASH_OOPS("invalid hh_prev %p, actual %p\n", \␊
256 _thh->hh_prev, _prev ); \␊
257 } \␊
258 _bkt_count++; \␊
259 _prev = (char*)(_thh); \␊
260 _thh = _thh->hh_next; \␊
261 } \␊
262 _count += _bkt_count; \␊
263 if ((head)->hh.tbl->buckets[_bkt_i].count != _bkt_count) { \␊
264 HASH_OOPS("invalid bucket count %d, actual %d\n", \␊
265 (head)->hh.tbl->buckets[_bkt_i].count, _bkt_count); \␊
266 } \␊
267 } \␊
268 if (_count != (head)->hh.tbl->num_items) { \␊
269 HASH_OOPS("invalid hh item count %d, actual %d\n", \␊
270 (head)->hh.tbl->num_items, _count ); \␊
271 } \␊
272 /* traverse hh in app order; check next/prev integrity, count */ \␊
273 _count = 0; \␊
274 _prev = NULL; \␊
275 _thh = &(head)->hh; \␊
276 while (_thh) { \␊
277 _count++; \␊
278 if (_prev !=(char*)(_thh->prev)) { \␊
279 HASH_OOPS("invalid prev %p, actual %p\n", \␊
280 _thh->prev, _prev ); \␊
281 } \␊
282 _prev = (char*)ELMT_FROM_HH((head)->hh.tbl, _thh); \␊
283 _thh = ( _thh->next ? (UT_hash_handle*)((char*)(_thh->next) + \␊
284 (head)->hh.tbl->hho) : NULL ); \␊
285 } \␊
286 if (_count != (head)->hh.tbl->num_items) { \␊
287 HASH_OOPS("invalid app item count %d, actual %d\n", \␊
288 (head)->hh.tbl->num_items, _count ); \␊
289 } \␊
290 } \␊
291} while (0)␊
292#else␊
293#define HASH_FSCK(hh,head) ␊
294#endif␊
295␊
296/* When compiled with -DHASH_EMIT_KEYS, length-prefixed keys are emitted to ␊
297 * the descriptor to which this macro is defined for tuning the hash function.␊
298 * The app can #include <unistd.h> to get the prototype for write(2). */␊
299#ifdef HASH_EMIT_KEYS␊
300#define HASH_EMIT_KEY(hh,head,keyptr,fieldlen) \␊
301do { \␊
302 unsigned _klen = fieldlen; \␊
303 write(HASH_EMIT_KEYS, &_klen, sizeof(_klen)); \␊
304 write(HASH_EMIT_KEYS, keyptr, fieldlen); \␊
305} while (0)␊
306#else ␊
307#define HASH_EMIT_KEY(hh,head,keyptr,fieldlen) ␊
308#endif␊
309␊
310/* default to Jenkin's hash unless overridden e.g. DHASH_FUNCTION=HASH_SAX */␊
311#ifdef HASH_FUNCTION ␊
312#define HASH_FCN HASH_FUNCTION␊
313#else␊
314#define HASH_FCN HASH_JEN␊
315#endif␊
316␊
317/* The Bernstein hash function, used in Perl prior to v5.6 */␊
318#define HASH_BER(key,keylen,num_bkts,hashv,bkt) \␊
319do { \␊
320 unsigned _hb_keylen=keylen; \␊
321 char *_hb_key=(char*)(key); \␊
322 (hashv) = 0; \␊
323 while (_hb_keylen--) { (hashv) = ((hashv) * 33) + *_hb_key++; } \␊
324 bkt = (hashv) & (num_bkts-1); \␊
325} while (0)␊
326␊
327␊
328/* SAX/FNV/OAT/JEN hash functions are macro variants of those listed at ␊
329 * http://eternallyconfuzzled.com/tuts/algorithms/jsw_tut_hashing.aspx */␊
330#define HASH_SAX(key,keylen,num_bkts,hashv,bkt) \␊
331do { \␊
332 unsigned _sx_i; \␊
333 char *_hs_key=(char*)(key); \␊
334 hashv = 0; \␊
335 for(_sx_i=0; _sx_i < keylen; _sx_i++) \␊
336 hashv ^= (hashv << 5) + (hashv >> 2) + _hs_key[_sx_i]; \␊
337 bkt = hashv & (num_bkts-1); \␊
338} while (0)␊
339␊
340#define HASH_FNV(key,keylen,num_bkts,hashv,bkt) \␊
341do { \␊
342 unsigned _fn_i; \␊
343 char *_hf_key=(char*)(key); \␊
344 hashv = 2166136261UL; \␊
345 for(_fn_i=0; _fn_i < keylen; _fn_i++) \␊
346 hashv = (hashv * 16777619) ^ _hf_key[_fn_i]; \␊
347 bkt = hashv & (num_bkts-1); \␊
348} while(0);␊
349 ␊
350#define HASH_OAT(key,keylen,num_bkts,hashv,bkt) \␊
351do { \␊
352 unsigned _ho_i; \␊
353 char *_ho_key=(char*)(key); \␊
354 hashv = 0; \␊
355 for(_ho_i=0; _ho_i < keylen; _ho_i++) { \␊
356 hashv += _ho_key[_ho_i]; \␊
357 hashv += (hashv << 10); \␊
358 hashv ^= (hashv >> 6); \␊
359 } \␊
360 hashv += (hashv << 3); \␊
361 hashv ^= (hashv >> 11); \␊
362 hashv += (hashv << 15); \␊
363 bkt = hashv & (num_bkts-1); \␊
364} while(0)␊
365␊
366#define HASH_JEN_MIX(a,b,c) \␊
367do { \␊
368 a -= b; a -= c; a ^= ( c >> 13 ); \␊
369 b -= c; b -= a; b ^= ( a << 8 ); \␊
370 c -= a; c -= b; c ^= ( b >> 13 ); \␊
371 a -= b; a -= c; a ^= ( c >> 12 ); \␊
372 b -= c; b -= a; b ^= ( a << 16 ); \␊
373 c -= a; c -= b; c ^= ( b >> 5 ); \␊
374 a -= b; a -= c; a ^= ( c >> 3 ); \␊
375 b -= c; b -= a; b ^= ( a << 10 ); \␊
376 c -= a; c -= b; c ^= ( b >> 15 ); \␊
377} while (0)␊
378␊
379#define HASH_JEN(key,keylen,num_bkts,hashv,bkt) \␊
380do { \␊
381 unsigned _hj_i,_hj_j,_hj_k; \␊
382 char *_hj_key=(char*)(key); \␊
383 hashv = 0xfeedbeef; \␊
384 _hj_i = _hj_j = 0x9e3779b9; \␊
385 _hj_k = keylen; \␊
386 while (_hj_k >= 12) { \␊
387 _hj_i += (_hj_key[0] + ( (unsigned)_hj_key[1] << 8 ) \␊
388 + ( (unsigned)_hj_key[2] << 16 ) \␊
389 + ( (unsigned)_hj_key[3] << 24 ) ); \␊
390 _hj_j += (_hj_key[4] + ( (unsigned)_hj_key[5] << 8 ) \␊
391 + ( (unsigned)_hj_key[6] << 16 ) \␊
392 + ( (unsigned)_hj_key[7] << 24 ) ); \␊
393 hashv += (_hj_key[8] + ( (unsigned)_hj_key[9] << 8 ) \␊
394 + ( (unsigned)_hj_key[10] << 16 ) \␊
395 + ( (unsigned)_hj_key[11] << 24 ) ); \␊
396 \␊
397 HASH_JEN_MIX(_hj_i, _hj_j, hashv); \␊
398 \␊
399 _hj_key += 12; \␊
400 _hj_k -= 12; \␊
401 } \␊
402 hashv += keylen; \␊
403 switch ( _hj_k ) { \␊
404 case 11: hashv += ( (unsigned)_hj_key[10] << 24 ); \␊
405 case 10: hashv += ( (unsigned)_hj_key[9] << 16 ); \␊
406 case 9: hashv += ( (unsigned)_hj_key[8] << 8 ); \␊
407 case 8: _hj_j += ( (unsigned)_hj_key[7] << 24 ); \␊
408 case 7: _hj_j += ( (unsigned)_hj_key[6] << 16 ); \␊
409 case 6: _hj_j += ( (unsigned)_hj_key[5] << 8 ); \␊
410 case 5: _hj_j += _hj_key[4]; \␊
411 case 4: _hj_i += ( (unsigned)_hj_key[3] << 24 ); \␊
412 case 3: _hj_i += ( (unsigned)_hj_key[2] << 16 ); \␊
413 case 2: _hj_i += ( (unsigned)_hj_key[1] << 8 ); \␊
414 case 1: _hj_i += _hj_key[0]; \␊
415 } \␊
416 HASH_JEN_MIX(_hj_i, _hj_j, hashv); \␊
417 bkt = hashv & (num_bkts-1); \␊
418} while(0)␊
419␊
420/* The Paul Hsieh hash function */␊
421#undef get16bits␊
422#if (defined(__GNUC__) && defined(__i386__)) || defined(__WATCOMC__) \␊
423 || defined(_MSC_VER) || defined (__BORLANDC__) || defined (__TURBOC__)␊
424#define get16bits(d) (*((const uint16_t *) (d)))␊
425#endif␊
426␊
427#if !defined (get16bits)␊
428#define get16bits(d) ((((uint32_t)(((const uint8_t *)(d))[1])) << 8) \␊
429 +(uint32_t)(((const uint8_t *)(d))[0]) )␊
430#endif␊
431#define HASH_SFH(key,keylen,num_bkts,hashv,bkt) \␊
432do { \␊
433 char *_sfh_key=(char*)(key); \␊
434 uint32_t _sfh_tmp, _sfh_len = keylen; \␊
435 \␊
436 int _sfh_rem = _sfh_len & 3; \␊
437 _sfh_len >>= 2; \␊
438 hashv = 0xcafebabe; \␊
439 \␊
440 /* Main loop */ \␊
441 for (;_sfh_len > 0; _sfh_len--) { \␊
442 hashv += get16bits (_sfh_key); \␊
443 _sfh_tmp = (get16bits (_sfh_key+2) << 11) ^ hashv; \␊
444 hashv = (hashv << 16) ^ _sfh_tmp; \␊
445 _sfh_key += 2*sizeof (uint16_t); \␊
446 hashv += hashv >> 11; \␊
447 } \␊
448 \␊
449 /* Handle end cases */ \␊
450 switch (_sfh_rem) { \␊
451 case 3: hashv += get16bits (_sfh_key); \␊
452 hashv ^= hashv << 16; \␊
453 hashv ^= _sfh_key[sizeof (uint16_t)] << 18; \␊
454 hashv += hashv >> 11; \␊
455 break; \␊
456 case 2: hashv += get16bits (_sfh_key); \␊
457 hashv ^= hashv << 11; \␊
458 hashv += hashv >> 17; \␊
459 break; \␊
460 case 1: hashv += *_sfh_key; \␊
461 hashv ^= hashv << 10; \␊
462 hashv += hashv >> 1; \␊
463 } \␊
464 \␊
465 /* Force "avalanching" of final 127 bits */ \␊
466 hashv ^= hashv << 3; \␊
467 hashv += hashv >> 5; \␊
468 hashv ^= hashv << 4; \␊
469 hashv += hashv >> 17; \␊
470 hashv ^= hashv << 25; \␊
471 hashv += hashv >> 6; \␊
472 bkt = hashv & (num_bkts-1); \␊
473} while(0);␊
474␊
475#ifdef HASH_USING_NO_STRICT_ALIASING␊
476/* The MurmurHash exploits some CPU's (x86,x86_64) tolerance for unaligned reads.␊
477 * For other types of CPU's (e.g. Sparc) an unaligned read causes a bus error.␊
478 * MurmurHash uses the faster approach only on CPU's where we know it's safe. ␊
479 *␊
480 * Note the preprocessor built-in defines can be emitted using:␊
481 *␊
482 * gcc -m64 -dM -E - < /dev/null (on gcc)␊
483 * cc -## a.c (where a.c is a simple test file) (Sun Studio)␊
484 */␊
485#if (defined(__i386__) || defined(__x86_64__)) ␊
486#define MUR_GETBLOCK(p,i) p[i]␊
487#else /* non intel */␊
488#define MUR_PLUS0_ALIGNED(p) (((unsigned long)p & 0x3) == 0)␊
489#define MUR_PLUS1_ALIGNED(p) (((unsigned long)p & 0x3) == 1)␊
490#define MUR_PLUS2_ALIGNED(p) (((unsigned long)p & 0x3) == 2)␊
491#define MUR_PLUS3_ALIGNED(p) (((unsigned long)p & 0x3) == 3)␊
492#define WP(p) ((uint32_t*)((unsigned long)(p) & ~3UL))␊
493#if (defined(__BIG_ENDIAN__) || defined(SPARC) || defined(__ppc__) || defined(__ppc64__))␊
494#define MUR_THREE_ONE(p) ((((*WP(p))&0x00ffffff) << 8) | (((*(WP(p)+1))&0xff000000) >> 24))␊
495#define MUR_TWO_TWO(p) ((((*WP(p))&0x0000ffff) <<16) | (((*(WP(p)+1))&0xffff0000) >> 16))␊
496#define MUR_ONE_THREE(p) ((((*WP(p))&0x000000ff) <<24) | (((*(WP(p)+1))&0xffffff00) >> 8))␊
497#else /* assume little endian non-intel */␊
498#define MUR_THREE_ONE(p) ((((*WP(p))&0xffffff00) >> 8) | (((*(WP(p)+1))&0x000000ff) << 24))␊
499#define MUR_TWO_TWO(p) ((((*WP(p))&0xffff0000) >>16) | (((*(WP(p)+1))&0x0000ffff) << 16))␊
500#define MUR_ONE_THREE(p) ((((*WP(p))&0xff000000) >>24) | (((*(WP(p)+1))&0x00ffffff) << 8))␊
501#endif␊
502#define MUR_GETBLOCK(p,i) (MUR_PLUS0_ALIGNED(p) ? ((p)[i]) : \␊
503 (MUR_PLUS1_ALIGNED(p) ? MUR_THREE_ONE(p) : \␊
504 (MUR_PLUS2_ALIGNED(p) ? MUR_TWO_TWO(p) : \␊
505 MUR_ONE_THREE(p))))␊
506#endif␊
507#define MUR_ROTL32(x,r) (((x) << (r)) | ((x) >> (32 - (r))))␊
508#define MUR_FMIX(_h) \␊
509do { \␊
510 _h ^= _h >> 16; \␊
511 _h *= 0x85ebca6b; \␊
512 _h ^= _h >> 13; \␊
513 _h *= 0xc2b2ae35l; \␊
514 _h ^= _h >> 16; \␊
515} while(0)␊
516␊
517#define HASH_MUR(key,keylen,num_bkts,hashv,bkt) \␊
518do { \␊
519 const uint8_t *_mur_data = (const uint8_t*)(key); \␊
520 const int _mur_nblocks = (keylen) / 4; \␊
521 uint32_t _mur_h1 = 0xf88D5353; \␊
522 uint32_t _mur_c1 = 0xcc9e2d51; \␊
523 uint32_t _mur_c2 = 0x1b873593; \␊
524 const uint32_t *_mur_blocks = (const uint32_t*)(_mur_data+_mur_nblocks*4); \␊
525 int _mur_i; \␊
526 for(_mur_i = -_mur_nblocks; _mur_i; _mur_i++) { \␊
527 uint32_t _mur_k1 = MUR_GETBLOCK(_mur_blocks,_mur_i); \␊
528 _mur_k1 *= _mur_c1; \␊
529 _mur_k1 = MUR_ROTL32(_mur_k1,15); \␊
530 _mur_k1 *= _mur_c2; \␊
531 \␊
532 _mur_h1 ^= _mur_k1; \␊
533 _mur_h1 = MUR_ROTL32(_mur_h1,13); \␊
534 _mur_h1 = _mur_h1*5+0xe6546b64; \␊
535 } \␊
536 const uint8_t *_mur_tail = (const uint8_t*)(_mur_data + _mur_nblocks*4); \␊
537 uint32_t _mur_k1=0; \␊
538 switch((keylen) & 3) { \␊
539 case 3: _mur_k1 ^= _mur_tail[2] << 16; \␊
540 case 2: _mur_k1 ^= _mur_tail[1] << 8; \␊
541 case 1: _mur_k1 ^= _mur_tail[0]; \␊
542 _mur_k1 *= _mur_c1; \␊
543 _mur_k1 = MUR_ROTL32(_mur_k1,15); \␊
544 _mur_k1 *= _mur_c2; \␊
545 _mur_h1 ^= _mur_k1; \␊
546 } \␊
547 _mur_h1 ^= (keylen); \␊
548 MUR_FMIX(_mur_h1); \␊
549 hashv = _mur_h1; \␊
550 bkt = hashv & (num_bkts-1); \␊
551} while(0)␊
552#endif /* HASH_USING_NO_STRICT_ALIASING */␊
553␊
554/* key comparison function; return 0 if keys equal */␊
555#define HASH_KEYCMP(a,b,len) memcmp(a,b,len) ␊
556␊
557/* iterate over items in a known bucket to find desired item */␊
558#define HASH_FIND_IN_BKT(tbl,hh,head,keyptr,keylen_in,out) \␊
559do { \␊
560 if (head.hh_head) DECLTYPE_ASSIGN(out,ELMT_FROM_HH(tbl,head.hh_head)); \␊
561 else out=NULL; \␊
562 while (out) { \␊
563 if (out->hh.keylen == keylen_in) { \␊
564 if ((HASH_KEYCMP(out->hh.key,keyptr,keylen_in)) == 0) break; \␊
565 } \␊
566 if (out->hh.hh_next) DECLTYPE_ASSIGN(out,ELMT_FROM_HH(tbl,out->hh.hh_next)); \␊
567 else out = NULL; \␊
568 } \␊
569} while(0)␊
570␊
571/* add an item to a bucket */␊
572#define HASH_ADD_TO_BKT(head,addhh) \␊
573do { \␊
574 head.count++; \␊
575 (addhh)->hh_next = head.hh_head; \␊
576 (addhh)->hh_prev = NULL; \␊
577 if (head.hh_head) { (head).hh_head->hh_prev = (addhh); } \␊
578 (head).hh_head=addhh; \␊
579 if (head.count >= ((head.expand_mult+1) * HASH_BKT_CAPACITY_THRESH) \␊
580 && (addhh)->tbl->noexpand != 1) { \␊
581 HASH_EXPAND_BUCKETS((addhh)->tbl); \␊
582 } \␊
583} while(0)␊
584␊
585/* remove an item from a given bucket */␊
586#define HASH_DEL_IN_BKT(hh,head,hh_del) \␊
587 (head).count--; \␊
588 if ((head).hh_head == hh_del) { \␊
589 (head).hh_head = hh_del->hh_next; \␊
590 } \␊
591 if (hh_del->hh_prev) { \␊
592 hh_del->hh_prev->hh_next = hh_del->hh_next; \␊
593 } \␊
594 if (hh_del->hh_next) { \␊
595 hh_del->hh_next->hh_prev = hh_del->hh_prev; \␊
596 } ␊
597␊
598/* Bucket expansion has the effect of doubling the number of buckets␊
599 * and redistributing the items into the new buckets. Ideally the␊
600 * items will distribute more or less evenly into the new buckets␊
601 * (the extent to which this is true is a measure of the quality of␊
602 * the hash function as it applies to the key domain). ␊
603 * ␊
604 * With the items distributed into more buckets, the chain length␊
605 * (item count) in each bucket is reduced. Thus by expanding buckets␊
606 * the hash keeps a bound on the chain length. This bounded chain ␊
607 * length is the essence of how a hash provides constant time lookup.␊
608 * ␊
609 * The calculation of tbl->ideal_chain_maxlen below deserves some␊
610 * explanation. First, keep in mind that we're calculating the ideal␊
611 * maximum chain length based on the *new* (doubled) bucket count.␊
612 * In fractions this is just n/b (n=number of items,b=new num buckets).␊
613 * Since the ideal chain length is an integer, we want to calculate ␊
614 * ceil(n/b). We don't depend on floating point arithmetic in this␊
615 * hash, so to calculate ceil(n/b) with integers we could write␊
616 * ␊
617 * ceil(n/b) = (n/b) + ((n%b)?1:0)␊
618 * ␊
619 * and in fact a previous version of this hash did just that.␊
620 * But now we have improved things a bit by recognizing that b is␊
621 * always a power of two. We keep its base 2 log handy (call it lb),␊
622 * so now we can write this with a bit shift and logical AND:␊
623 * ␊
624 * ceil(n/b) = (n>>lb) + ( (n & (b-1)) ? 1:0)␊
625 * ␊
626 */␊
627#define HASH_EXPAND_BUCKETS(tbl) \␊
628do { \␊
629 unsigned _he_bkt; \␊
630 unsigned _he_bkt_i; \␊
631 struct UT_hash_handle *_he_thh, *_he_hh_nxt; \␊
632 UT_hash_bucket *_he_new_buckets, *_he_newbkt; \␊
633 _he_new_buckets = (UT_hash_bucket*)uthash_malloc( \␊
634 2 * tbl->num_buckets * sizeof(struct UT_hash_bucket)); \␊
635 if (!_he_new_buckets) { uthash_fatal( "out of memory"); } \␊
636 memset(_he_new_buckets, 0, \␊
637 2 * tbl->num_buckets * sizeof(struct UT_hash_bucket)); \␊
638 tbl->ideal_chain_maxlen = \␊
639 (tbl->num_items >> (tbl->log2_num_buckets+1)) + \␊
640 ((tbl->num_items & ((tbl->num_buckets*2)-1)) ? 1 : 0); \␊
641 tbl->nonideal_items = 0; \␊
642 for(_he_bkt_i = 0; _he_bkt_i < tbl->num_buckets; _he_bkt_i++) \␊
643 { \␊
644 _he_thh = tbl->buckets[ _he_bkt_i ].hh_head; \␊
645 while (_he_thh) { \␊
646 _he_hh_nxt = _he_thh->hh_next; \␊
647 HASH_TO_BKT( _he_thh->hashv, tbl->num_buckets*2, _he_bkt); \␊
648 _he_newbkt = &(_he_new_buckets[ _he_bkt ]); \␊
649 if (!_he_newbkt) { uthash_fatal( "out of memory"); } \␊
650 if (++(_he_newbkt->count) > tbl->ideal_chain_maxlen) { \␊
651 tbl->nonideal_items++; \␊
652 _he_newbkt->expand_mult = _he_newbkt->count / \␊
653 tbl->ideal_chain_maxlen; \␊
654 } \␊
655 _he_thh->hh_prev = NULL; \␊
656 _he_thh->hh_next = _he_newbkt->hh_head; \␊
657 if (_he_newbkt->hh_head) _he_newbkt->hh_head->hh_prev = \␊
658 _he_thh; \␊
659 _he_newbkt->hh_head = _he_thh; \␊
660 _he_thh = _he_hh_nxt; \␊
661 } \␊
662 } \␊
663 uthash_free( tbl->buckets, tbl->num_buckets*sizeof(struct UT_hash_bucket) ); \␊
664 tbl->num_buckets *= 2; \␊
665 tbl->log2_num_buckets++; \␊
666 tbl->buckets = _he_new_buckets; \␊
667 tbl->ineff_expands = (tbl->nonideal_items > (tbl->num_items >> 1)) ? \␊
668 (tbl->ineff_expands+1) : 0; \␊
669 if (tbl->ineff_expands > 1) { \␊
670 tbl->noexpand=1; \␊
671 uthash_noexpand_fyi(tbl); \␊
672 } \␊
673 uthash_expand_fyi(tbl); \␊
674} while(0)␊
675␊
676␊
677/* This is an adaptation of Simon Tatham's O(n log(n)) mergesort */␊
678/* Note that HASH_SORT assumes the hash handle name to be hh. ␊
679 * HASH_SRT was added to allow the hash handle name to be passed in. */␊
680#define HASH_SORT(head,cmpfcn) HASH_SRT(hh,head,cmpfcn)␊
681#define HASH_SRT(hh,head,cmpfcn) \␊
682do { \␊
683 unsigned _hs_i; \␊
684 unsigned _hs_looping,_hs_nmerges,_hs_insize,_hs_psize,_hs_qsize; \␊
685 struct UT_hash_handle *_hs_p, *_hs_q, *_hs_e, *_hs_list, *_hs_tail; \␊
686 if (head) { \␊
687 _hs_insize = 1; \␊
688 _hs_looping = 1; \␊
689 _hs_list = &((head)->hh); \␊
690 while (_hs_looping) { \␊
691 _hs_p = _hs_list; \␊
692 _hs_list = NULL; \␊
693 _hs_tail = NULL; \␊
694 _hs_nmerges = 0; \␊
695 while (_hs_p) { \␊
696 _hs_nmerges++; \␊
697 _hs_q = _hs_p; \␊
698 _hs_psize = 0; \␊
699 for ( _hs_i = 0; _hs_i < _hs_insize; _hs_i++ ) { \␊
700 _hs_psize++; \␊
701 _hs_q = (UT_hash_handle*)((_hs_q->next) ? \␊
702 ((void*)((char*)(_hs_q->next) + \␊
703 (head)->hh.tbl->hho)) : NULL); \␊
704 if (! (_hs_q) ) break; \␊
705 } \␊
706 _hs_qsize = _hs_insize; \␊
707 while ((_hs_psize > 0) || ((_hs_qsize > 0) && _hs_q )) { \␊
708 if (_hs_psize == 0) { \␊
709 _hs_e = _hs_q; \␊
710 _hs_q = (UT_hash_handle*)((_hs_q->next) ? \␊
711 ((void*)((char*)(_hs_q->next) + \␊
712 (head)->hh.tbl->hho)) : NULL); \␊
713 _hs_qsize--; \␊
714 } else if ( (_hs_qsize == 0) || !(_hs_q) ) { \␊
715 _hs_e = _hs_p; \␊
716 _hs_p = (UT_hash_handle*)((_hs_p->next) ? \␊
717 ((void*)((char*)(_hs_p->next) + \␊
718 (head)->hh.tbl->hho)) : NULL); \␊
719 _hs_psize--; \␊
720 } else if (( \␊
721 cmpfcn(DECLTYPE(head)(ELMT_FROM_HH((head)->hh.tbl,_hs_p)), \␊
722 DECLTYPE(head)(ELMT_FROM_HH((head)->hh.tbl,_hs_q))) \␊
723 ) <= 0) { \␊
724 _hs_e = _hs_p; \␊
725 _hs_p = (UT_hash_handle*)((_hs_p->next) ? \␊
726 ((void*)((char*)(_hs_p->next) + \␊
727 (head)->hh.tbl->hho)) : NULL); \␊
728 _hs_psize--; \␊
729 } else { \␊
730 _hs_e = _hs_q; \␊
731 _hs_q = (UT_hash_handle*)((_hs_q->next) ? \␊
732 ((void*)((char*)(_hs_q->next) + \␊
733 (head)->hh.tbl->hho)) : NULL); \␊
734 _hs_qsize--; \␊
735 } \␊
736 if ( _hs_tail ) { \␊
737 _hs_tail->next = ((_hs_e) ? \␊
738 ELMT_FROM_HH((head)->hh.tbl,_hs_e) : NULL); \␊
739 } else { \␊
740 _hs_list = _hs_e; \␊
741 } \␊
742 _hs_e->prev = ((_hs_tail) ? \␊
743 ELMT_FROM_HH((head)->hh.tbl,_hs_tail) : NULL); \␊
744 _hs_tail = _hs_e; \␊
745 } \␊
746 _hs_p = _hs_q; \␊
747 } \␊
748 _hs_tail->next = NULL; \␊
749 if ( _hs_nmerges <= 1 ) { \␊
750 _hs_looping=0; \␊
751 (head)->hh.tbl->tail = _hs_tail; \␊
752 DECLTYPE_ASSIGN(head,ELMT_FROM_HH((head)->hh.tbl, _hs_list)); \␊
753 } \␊
754 _hs_insize *= 2; \␊
755 } \␊
756 HASH_FSCK(hh,head); \␊
757 } \␊
758} while (0)␊
759␊
760/* This function selects items from one hash into another hash. ␊
761 * The end result is that the selected items have dual presence ␊
762 * in both hashes. There is no copy of the items made; rather ␊
763 * they are added into the new hash through a secondary hash ␊
764 * hash handle that must be present in the structure. */␊
765#define HASH_SELECT(hh_dst, dst, hh_src, src, cond) \␊
766do { \␊
767 unsigned _src_bkt, _dst_bkt; \␊
768 void *_last_elt=NULL, *_elt; \␊
769 UT_hash_handle *_src_hh, *_dst_hh, *_last_elt_hh=NULL; \␊
770 ptrdiff_t _dst_hho = ((char*)(&(dst)->hh_dst) - (char*)(dst)); \␊
771 if (src) { \␊
772 for(_src_bkt=0; _src_bkt < (src)->hh_src.tbl->num_buckets; _src_bkt++) { \␊
773 for(_src_hh = (src)->hh_src.tbl->buckets[_src_bkt].hh_head; \␊
774 _src_hh; \␊
775 _src_hh = _src_hh->hh_next) { \␊
776 _elt = ELMT_FROM_HH((src)->hh_src.tbl, _src_hh); \␊
777 if (cond(_elt)) { \␊
778 _dst_hh = (UT_hash_handle*)(((char*)_elt) + _dst_hho); \␊
779 _dst_hh->key = _src_hh->key; \␊
780 _dst_hh->keylen = _src_hh->keylen; \␊
781 _dst_hh->hashv = _src_hh->hashv; \␊
782 _dst_hh->prev = _last_elt; \␊
783 _dst_hh->next = NULL; \␊
784 if (_last_elt_hh) { _last_elt_hh->next = _elt; } \␊
785 if (!dst) { \␊
786 DECLTYPE_ASSIGN(dst,_elt); \␊
787 HASH_MAKE_TABLE(hh_dst,dst); \␊
788 } else { \␊
789 _dst_hh->tbl = (dst)->hh_dst.tbl; \␊
790 } \␊
791 HASH_TO_BKT(_dst_hh->hashv, _dst_hh->tbl->num_buckets, _dst_bkt); \␊
792 HASH_ADD_TO_BKT(_dst_hh->tbl->buckets[_dst_bkt],_dst_hh); \␊
793 (dst)->hh_dst.tbl->num_items++; \␊
794 _last_elt = _elt; \␊
795 _last_elt_hh = _dst_hh; \␊
796 } \␊
797 } \␊
798 } \␊
799 } \␊
800 HASH_FSCK(hh_dst,dst); \␊
801} while (0)␊
802␊
803#define HASH_CLEAR(hh,head) \␊
804do { \␊
805 if (head) { \␊
806 uthash_free((head)->hh.tbl->buckets, \␊
807 (head)->hh.tbl->num_buckets*sizeof(struct UT_hash_bucket)); \␊
808 HASH_BLOOM_FREE((head)->hh.tbl); \␊
809 uthash_free((head)->hh.tbl, sizeof(UT_hash_table)); \␊
810 (head)=NULL; \␊
811 } \␊
812} while(0)␊
813␊
814#ifdef NO_DECLTYPE␊
815#define HASH_ITER(hh,head,el,tmp) \␊
816for((el)=(head), (*(char**)(&(tmp)))=(char*)((head)?(head)->hh.next:NULL); \␊
817 el; (el)=(tmp),(*(char**)(&(tmp)))=(char*)((tmp)?(tmp)->hh.next:NULL)) ␊
818#else␊
819#define HASH_ITER(hh,head,el,tmp) \␊
820for((el)=(head),(tmp)=DECLTYPE(el)((head)?(head)->hh.next:NULL); \␊
821 el; (el)=(tmp),(tmp)=DECLTYPE(el)((tmp)?(tmp)->hh.next:NULL))␊
822#endif␊
823␊
824/* obtain a count of items in the hash */␊
825#define HASH_COUNT(head) HASH_CNT(hh,head) ␊
826#define HASH_CNT(hh,head) ((head)?((head)->hh.tbl->num_items):0)␊
827␊
828typedef struct UT_hash_bucket {␊
829 struct UT_hash_handle *hh_head;␊
830 unsigned count;␊
831␊
832 /* expand_mult is normally set to 0. In this situation, the max chain length␊
833 * threshold is enforced at its default value, HASH_BKT_CAPACITY_THRESH. (If␊
834 * the bucket's chain exceeds this length, bucket expansion is triggered). ␊
835 * However, setting expand_mult to a non-zero value delays bucket expansion␊
836 * (that would be triggered by additions to this particular bucket)␊
837 * until its chain length reaches a *multiple* of HASH_BKT_CAPACITY_THRESH.␊
838 * (The multiplier is simply expand_mult+1). The whole idea of this␊
839 * multiplier is to reduce bucket expansions, since they are expensive, in␊
840 * situations where we know that a particular bucket tends to be overused.␊
841 * It is better to let its chain length grow to a longer yet-still-bounded␊
842 * value, than to do an O(n) bucket expansion too often. ␊
843 */␊
844 unsigned expand_mult;␊
845␊
846} UT_hash_bucket;␊
847␊
848/* random signature used only to find hash tables in external analysis */␊
849#define HASH_SIGNATURE 0xa0111fe1␊
850#define HASH_BLOOM_SIGNATURE 0xb12220f2␊
851␊
852typedef struct UT_hash_table {␊
853 UT_hash_bucket *buckets;␊
854 unsigned num_buckets, log2_num_buckets;␊
855 unsigned num_items;␊
856 struct UT_hash_handle *tail; /* tail hh in app order, for fast append */␊
857 ptrdiff_t hho; /* hash handle offset (byte pos of hash handle in element */␊
858␊
859 /* in an ideal situation (all buckets used equally), no bucket would have␊
860 * more than ceil(#items/#buckets) items. that's the ideal chain length. */␊
861 unsigned ideal_chain_maxlen;␊
862␊
863 /* nonideal_items is the number of items in the hash whose chain position␊
864 * exceeds the ideal chain maxlen. these items pay the penalty for an uneven␊
865 * hash distribution; reaching them in a chain traversal takes >ideal steps */␊
866 unsigned nonideal_items;␊
867␊
868 /* ineffective expands occur when a bucket doubling was performed, but ␊
869 * afterward, more than half the items in the hash had nonideal chain␊
870 * positions. If this happens on two consecutive expansions we inhibit any␊
871 * further expansion, as it's not helping; this happens when the hash␊
872 * function isn't a good fit for the key domain. When expansion is inhibited␊
873 * the hash will still work, albeit no longer in constant time. */␊
874 unsigned ineff_expands, noexpand;␊
875␊
876 uint32_t signature; /* used only to find hash tables in external analysis */␊
877#ifdef HASH_BLOOM␊
878 uint32_t bloom_sig; /* used only to test bloom exists in external analysis */␊
879 uint8_t *bloom_bv;␊
880 char bloom_nbits;␊
881#endif␊
882␊
883} UT_hash_table;␊
884␊
885typedef struct UT_hash_handle {␊
886 struct UT_hash_table *tbl;␊
887 void *prev; /* prev element in app order */␊
888 void *next; /* next element in app order */␊
889 struct UT_hash_handle *hh_prev; /* previous hh in bucket order */␊
890 struct UT_hash_handle *hh_next; /* next hh in bucket order */␊
891 void *key; /* ptr to enclosing struct's key */␊
892 unsigned keylen; /* enclosing struct's key len */␊
893 unsigned hashv; /* result of hash-fcn(key) */␊
894} UT_hash_handle;␊
895␊
896#endif /* UTHASH_H */␊
897

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