aboutsummaryrefslogtreecommitdiff
path: root/uthash/uthash.h
diff options
context:
space:
mode:
Diffstat (limited to 'uthash/uthash.h')
-rw-r--r--uthash/uthash.h720
1 files changed, 720 insertions, 0 deletions
diff --git a/uthash/uthash.h b/uthash/uthash.h
new file mode 100644
index 000000000000..36b1cf46a4b4
--- /dev/null
+++ b/uthash/uthash.h
@@ -0,0 +1,720 @@
+/*
+Copyright (c) 2003-2013, Troy D. Hanson http://troydhanson.github.com/uthash/
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+ * Redistributions of source code must retain the above copyright
+ notice, this list of conditions and the following disclaimer.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
+PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
+OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+#ifndef UTHASH_H
+#define UTHASH_H
+
+#include <string.h> /* memcmp,strlen */
+#include <stddef.h> /* ptrdiff_t */
+#include <stdlib.h> /* exit() */
+#include "xxhash.h"
+
+/* These macros use decltype or the earlier __typeof GNU extension.
+ As decltype is only available in newer compilers (VS2010 or gcc 4.3+
+ when compiling c++ source) this code uses whatever method is needed
+ or, for VS2008 where neither is available, uses casting workarounds. */
+#ifdef _MSC_VER /* MS compiler */
+#if _MSC_VER >= 1600 && defined(__cplusplus) /* VS2010 or newer in C++ mode */
+#define DECLTYPE(x) (decltype(x))
+#else /* VS2008 or older (or VS2010 in C mode) */
+#define NO_DECLTYPE
+#define DECLTYPE(x)
+#endif
+#else /* GNU, Sun and other compilers */
+#define DECLTYPE(x) (__typeof(x))
+#endif
+
+#ifdef NO_DECLTYPE
+#define DECLTYPE_ASSIGN(dst,src) \
+do { \
+ char **_da_dst = (char**)(&(dst)); \
+ *_da_dst = (char*)(src); \
+} while(0)
+#else
+#define DECLTYPE_ASSIGN(dst,src) \
+do { \
+ (dst) = DECLTYPE(dst)(src); \
+} while(0)
+#endif
+
+/* a number of the hash function use uint32_t which isn't defined on win32 */
+#ifdef _MSC_VER
+typedef unsigned int uint32_t;
+typedef unsigned char uint8_t;
+#else
+#include <inttypes.h> /* uint32_t */
+#endif
+
+#define UTHASH_VERSION 1.9.8
+
+#ifndef uthash_fatal
+#define uthash_fatal(msg) exit(-1) /* fatal error (out of memory,etc) */
+#endif
+#ifndef uthash_malloc
+#define uthash_malloc(sz) malloc(sz) /* malloc fcn */
+#endif
+#ifndef uthash_free
+#define uthash_free(ptr,sz) free(ptr) /* free fcn */
+#endif
+
+#ifndef uthash_noexpand_fyi
+#define uthash_noexpand_fyi(tbl) /* can be defined to log noexpand */
+#endif
+#ifndef uthash_expand_fyi
+#define uthash_expand_fyi(tbl) /* can be defined to log expands */
+#endif
+
+/* initial number of buckets */
+#define HASH_INITIAL_NUM_BUCKETS 32 /* initial number of buckets */
+#define HASH_INITIAL_NUM_BUCKETS_LOG2 5 /* lg2 of initial number of buckets */
+#define HASH_BKT_CAPACITY_THRESH 10 /* expand when bucket count reaches */
+
+/* calculate the element whose hash handle address is hhe */
+#define ELMT_FROM_HH(tbl,hhp) ((void*)(((char*)(hhp)) - ((tbl)->hho)))
+
+#define HASH_FIND(hh,head,keyptr,keylen,out) \
+do { \
+ unsigned _hf_bkt,_hf_hashv; \
+ out=NULL; \
+ if (head) { \
+ HASH_FCN(keyptr,keylen, (head)->hh.tbl->num_buckets, _hf_hashv, _hf_bkt); \
+ if (HASH_BLOOM_TEST((head)->hh.tbl, _hf_hashv)) { \
+ HASH_FIND_IN_BKT((head)->hh.tbl, hh, (head)->hh.tbl->buckets[ _hf_bkt ], \
+ keyptr,keylen,out); \
+ } \
+ } \
+} while (0)
+
+#ifdef HASH_BLOOM
+#define HASH_BLOOM_BITLEN (1ULL << HASH_BLOOM)
+#define HASH_BLOOM_BYTELEN (HASH_BLOOM_BITLEN/8) + ((HASH_BLOOM_BITLEN%8) ? 1:0)
+#define HASH_BLOOM_MAKE(tbl) \
+do { \
+ (tbl)->bloom_nbits = HASH_BLOOM; \
+ (tbl)->bloom_bv = (uint8_t*)uthash_malloc(HASH_BLOOM_BYTELEN); \
+ if (!((tbl)->bloom_bv)) { uthash_fatal( "out of memory"); } \
+ memset((tbl)->bloom_bv, 0, HASH_BLOOM_BYTELEN); \
+ (tbl)->bloom_sig = HASH_BLOOM_SIGNATURE; \
+} while (0)
+
+#define HASH_BLOOM_FREE(tbl) \
+do { \
+ uthash_free((tbl)->bloom_bv, HASH_BLOOM_BYTELEN); \
+} while (0)
+
+#define HASH_BLOOM_BITSET(bv,idx) (bv[(idx)/8] |= (1U << ((idx)%8)))
+#define HASH_BLOOM_BITTEST(bv,idx) (bv[(idx)/8] & (1U << ((idx)%8)))
+
+#define HASH_BLOOM_ADD(tbl,hashv) \
+ HASH_BLOOM_BITSET((tbl)->bloom_bv, (hashv & (uint32_t)((1ULL << (tbl)->bloom_nbits) - 1)))
+
+#define HASH_BLOOM_TEST(tbl,hashv) \
+ HASH_BLOOM_BITTEST((tbl)->bloom_bv, (hashv & (uint32_t)((1ULL << (tbl)->bloom_nbits) - 1)))
+
+#else
+#define HASH_BLOOM_MAKE(tbl)
+#define HASH_BLOOM_FREE(tbl)
+#define HASH_BLOOM_ADD(tbl,hashv)
+#define HASH_BLOOM_TEST(tbl,hashv) (1)
+#define HASH_BLOOM_BYTELEN 0
+#endif
+
+#define HASH_MAKE_TABLE(hh,head) \
+do { \
+ (head)->hh.tbl = (UT_hash_table*)uthash_malloc( \
+ sizeof(UT_hash_table)); \
+ if (!((head)->hh.tbl)) { uthash_fatal( "out of memory"); } \
+ memset((head)->hh.tbl, 0, sizeof(UT_hash_table)); \
+ (head)->hh.tbl->tail = &((head)->hh); \
+ (head)->hh.tbl->num_buckets = HASH_INITIAL_NUM_BUCKETS; \
+ (head)->hh.tbl->log2_num_buckets = HASH_INITIAL_NUM_BUCKETS_LOG2; \
+ (head)->hh.tbl->hho = (char*)(&(head)->hh) - (char*)(head); \
+ (head)->hh.tbl->buckets = (UT_hash_bucket*)uthash_malloc( \
+ HASH_INITIAL_NUM_BUCKETS*sizeof(struct UT_hash_bucket)); \
+ if (! (head)->hh.tbl->buckets) { uthash_fatal( "out of memory"); } \
+ memset((head)->hh.tbl->buckets, 0, \
+ HASH_INITIAL_NUM_BUCKETS*sizeof(struct UT_hash_bucket)); \
+ HASH_BLOOM_MAKE((head)->hh.tbl); \
+ (head)->hh.tbl->signature = HASH_SIGNATURE; \
+} while(0)
+
+#define HASH_ADD(hh,head,fieldname,keylen_in,add) \
+ HASH_ADD_KEYPTR(hh,head,&((add)->fieldname),keylen_in,add)
+
+#define HASH_REPLACE(hh,head,fieldname,keylen_in,add,replaced) \
+do { \
+ replaced=NULL; \
+ HASH_FIND(hh,head,&((add)->fieldname),keylen_in,replaced); \
+ if (replaced!=NULL) { \
+ HASH_DELETE(hh,head,replaced); \
+ }; \
+ HASH_ADD(hh,head,fieldname,keylen_in,add); \
+} while(0)
+
+#define HASH_ADD_KEYPTR(hh,head,keyptr,keylen_in,add) \
+do { \
+ unsigned _ha_bkt; \
+ (add)->hh.next = NULL; \
+ (add)->hh.key = (const char*)keyptr; \
+ (add)->hh.keylen = (unsigned)keylen_in; \
+ if (!(head)) { \
+ head = (add); \
+ (head)->hh.prev = NULL; \
+ HASH_MAKE_TABLE(hh,head); \
+ } else { \
+ (head)->hh.tbl->tail->next = (add); \
+ (add)->hh.prev = ELMT_FROM_HH((head)->hh.tbl, (head)->hh.tbl->tail); \
+ (head)->hh.tbl->tail = &((add)->hh); \
+ } \
+ (head)->hh.tbl->num_items++; \
+ (add)->hh.tbl = (head)->hh.tbl; \
+ HASH_FCN(keyptr,keylen_in, (head)->hh.tbl->num_buckets, \
+ (add)->hh.hashv, _ha_bkt); \
+ HASH_ADD_TO_BKT((head)->hh.tbl->buckets[_ha_bkt],&(add)->hh); \
+ HASH_BLOOM_ADD((head)->hh.tbl,(add)->hh.hashv); \
+ HASH_EMIT_KEY(hh,head,keyptr,keylen_in); \
+ HASH_FSCK(hh,head); \
+} while(0)
+
+#define HASH_TO_BKT( hashv, num_bkts, bkt ) \
+do { \
+ bkt = ((hashv) & ((num_bkts) - 1)); \
+} while(0)
+
+/* delete "delptr" from the hash table.
+ * "the usual" patch-up process for the app-order doubly-linked-list.
+ * The use of _hd_hh_del below deserves special explanation.
+ * These used to be expressed using (delptr) but that led to a bug
+ * if someone used the same symbol for the head and deletee, like
+ * HASH_DELETE(hh,users,users);
+ * We want that to work, but by changing the head (users) below
+ * we were forfeiting our ability to further refer to the deletee (users)
+ * in the patch-up process. Solution: use scratch space to
+ * copy the deletee pointer, then the latter references are via that
+ * scratch pointer rather than through the repointed (users) symbol.
+ */
+#define HASH_DELETE(hh,head,delptr) \
+do { \
+ unsigned _hd_bkt; \
+ struct UT_hash_handle *_hd_hh_del; \
+ if ( ((delptr)->hh.prev == NULL) && ((delptr)->hh.next == NULL) ) { \
+ uthash_free((head)->hh.tbl->buckets, \
+ (head)->hh.tbl->num_buckets*sizeof(struct UT_hash_bucket) ); \
+ HASH_BLOOM_FREE((head)->hh.tbl); \
+ uthash_free((head)->hh.tbl, sizeof(UT_hash_table)); \
+ head = NULL; \
+ } else { \
+ _hd_hh_del = &((delptr)->hh); \
+ if ((delptr) == ELMT_FROM_HH((head)->hh.tbl,(head)->hh.tbl->tail)) { \
+ (head)->hh.tbl->tail = \
+ (UT_hash_handle*)((ptrdiff_t)((delptr)->hh.prev) + \
+ (head)->hh.tbl->hho); \
+ } \
+ if ((delptr)->hh.prev) { \
+ ((UT_hash_handle*)((ptrdiff_t)((delptr)->hh.prev) + \
+ (head)->hh.tbl->hho))->next = (delptr)->hh.next; \
+ } else { \
+ DECLTYPE_ASSIGN(head,(delptr)->hh.next); \
+ } \
+ if (_hd_hh_del->next) { \
+ ((UT_hash_handle*)((ptrdiff_t)_hd_hh_del->next + \
+ (head)->hh.tbl->hho))->prev = \
+ _hd_hh_del->prev; \
+ } \
+ HASH_TO_BKT( _hd_hh_del->hashv, (head)->hh.tbl->num_buckets, _hd_bkt); \
+ HASH_DEL_IN_BKT(hh,(head)->hh.tbl->buckets[_hd_bkt], _hd_hh_del); \
+ (head)->hh.tbl->num_items--; \
+ } \
+ HASH_FSCK(hh,head); \
+} while (0)
+
+
+/* convenience forms of HASH_FIND/HASH_ADD/HASH_DEL */
+#define HASH_FIND_STR(head,findstr,out) \
+ HASH_FIND(hh,head,findstr,strlen(findstr),out)
+#define HASH_ADD_STR(head,strfield,add) \
+ HASH_ADD(hh,head,strfield,strlen(add->strfield),add)
+#define HASH_REPLACE_STR(head,strfield,add,replaced) \
+ HASH_REPLACE(hh,head,strfield,strlen(add->strfield),add,replaced)
+#define HASH_FIND_INT(head,findint,out) \
+ HASH_FIND(hh,head,findint,sizeof(int),out)
+#define HASH_ADD_INT(head,intfield,add) \
+ HASH_ADD(hh,head,intfield,sizeof(int),add)
+#define HASH_REPLACE_INT(head,intfield,add,replaced) \
+ HASH_REPLACE(hh,head,intfield,sizeof(int),add,replaced)
+#define HASH_FIND_PTR(head,findptr,out) \
+ HASH_FIND(hh,head,findptr,sizeof(void *),out)
+#define HASH_ADD_PTR(head,ptrfield,add) \
+ HASH_ADD(hh,head,ptrfield,sizeof(void *),add)
+#define HASH_REPLACE_PTR(head,ptrfield,add) \
+ HASH_REPLACE(hh,head,ptrfield,sizeof(void *),add,replaced)
+#define HASH_DEL(head,delptr) \
+ HASH_DELETE(hh,head,delptr)
+
+/* HASH_FSCK checks hash integrity on every add/delete when HASH_DEBUG is defined.
+ * This is for uthash developer only; it compiles away if HASH_DEBUG isn't defined.
+ */
+#ifdef HASH_DEBUG
+#define HASH_OOPS(...) do { fprintf(stderr,__VA_ARGS__); exit(-1); } while (0)
+#define HASH_FSCK(hh,head) \
+do { \
+ unsigned _bkt_i; \
+ unsigned _count, _bkt_count; \
+ char *_prev; \
+ struct UT_hash_handle *_thh; \
+ if (head) { \
+ _count = 0; \
+ for( _bkt_i = 0; _bkt_i < (head)->hh.tbl->num_buckets; _bkt_i++) { \
+ _bkt_count = 0; \
+ _thh = (head)->hh.tbl->buckets[_bkt_i].hh_head; \
+ _prev = NULL; \
+ while (_thh) { \
+ if (_prev != (char*)(_thh->hh_prev)) { \
+ HASH_OOPS("invalid hh_prev %p, actual %p\n", \
+ _thh->hh_prev, _prev ); \
+ } \
+ _bkt_count++; \
+ _prev = (char*)(_thh); \
+ _thh = _thh->hh_next; \
+ } \
+ _count += _bkt_count; \
+ if ((head)->hh.tbl->buckets[_bkt_i].count != _bkt_count) { \
+ HASH_OOPS("invalid bucket count %d, actual %d\n", \
+ (head)->hh.tbl->buckets[_bkt_i].count, _bkt_count); \
+ } \
+ } \
+ if (_count != (head)->hh.tbl->num_items) { \
+ HASH_OOPS("invalid hh item count %d, actual %d\n", \
+ (head)->hh.tbl->num_items, _count ); \
+ } \
+ /* traverse hh in app order; check next/prev integrity, count */ \
+ _count = 0; \
+ _prev = NULL; \
+ _thh = &(head)->hh; \
+ while (_thh) { \
+ _count++; \
+ if (_prev !=(char*)(_thh->prev)) { \
+ HASH_OOPS("invalid prev %p, actual %p\n", \
+ _thh->prev, _prev ); \
+ } \
+ _prev = (char*)ELMT_FROM_HH((head)->hh.tbl, _thh); \
+ _thh = ( _thh->next ? (UT_hash_handle*)((char*)(_thh->next) + \
+ (head)->hh.tbl->hho) : NULL ); \
+ } \
+ if (_count != (head)->hh.tbl->num_items) { \
+ HASH_OOPS("invalid app item count %d, actual %d\n", \
+ (head)->hh.tbl->num_items, _count ); \
+ } \
+ } \
+} while (0)
+#else
+#define HASH_FSCK(hh,head)
+#endif
+
+/* When compiled with -DHASH_EMIT_KEYS, length-prefixed keys are emitted to
+ * the descriptor to which this macro is defined for tuning the hash function.
+ * The app can #include <unistd.h> to get the prototype for write(2). */
+#ifdef HASH_EMIT_KEYS
+#define HASH_EMIT_KEY(hh,head,keyptr,fieldlen) \
+do { \
+ unsigned _klen = fieldlen; \
+ write(HASH_EMIT_KEYS, &_klen, sizeof(_klen)); \
+ write(HASH_EMIT_KEYS, keyptr, fieldlen); \
+} while (0)
+#else
+#define HASH_EMIT_KEY(hh,head,keyptr,fieldlen)
+#endif
+
+/* default to Jenkin's hash unless overridden e.g. DHASH_FUNCTION=HASH_SAX */
+#ifdef HASH_FUNCTION
+#define HASH_FCN HASH_FUNCTION
+#else
+#define HASH_FCN HASH_XX
+#endif
+
+#define XX_HASH_PRIME 2654435761U
+
+#define HASH_XX(key,keylen,num_bkts,hashv,bkt) \
+do { \
+ hashv = XXH32 (key, keylen, XX_HASH_PRIME); \
+ bkt = (hashv) & (num_bkts-1); \
+} while (0)
+
+
+
+/* key comparison function; return 0 if keys equal */
+#define HASH_KEYCMP(a,b,len) memcmp(a,b,len)
+
+/* iterate over items in a known bucket to find desired item */
+#define HASH_FIND_IN_BKT(tbl,hh,head,keyptr,keylen_in,out) \
+do { \
+ if (head.hh_head) DECLTYPE_ASSIGN(out,ELMT_FROM_HH(tbl,head.hh_head)); \
+ else out=NULL; \
+ while (out) { \
+ if ((out)->hh.keylen == keylen_in) { \
+ if ((HASH_KEYCMP((out)->hh.key,keyptr,keylen_in)) == 0) break; \
+ } \
+ if ((out)->hh.hh_next) DECLTYPE_ASSIGN(out,ELMT_FROM_HH(tbl,(out)->hh.hh_next)); \
+ else out = NULL; \
+ } \
+} while(0)
+
+/* add an item to a bucket */
+#define HASH_ADD_TO_BKT(head,addhh) \
+do { \
+ head.count++; \
+ (addhh)->hh_next = head.hh_head; \
+ (addhh)->hh_prev = NULL; \
+ if (head.hh_head) { (head).hh_head->hh_prev = (addhh); } \
+ (head).hh_head=addhh; \
+ if (head.count >= ((head.expand_mult+1) * HASH_BKT_CAPACITY_THRESH) \
+ && (addhh)->tbl->noexpand != 1) { \
+ HASH_EXPAND_BUCKETS((addhh)->tbl); \
+ } \
+} while(0)
+
+/* remove an item from a given bucket */
+#define HASH_DEL_IN_BKT(hh,head,hh_del) \
+ (head).count--; \
+ if ((head).hh_head == hh_del) { \
+ (head).hh_head = hh_del->hh_next; \
+ } \
+ if (hh_del->hh_prev) { \
+ hh_del->hh_prev->hh_next = hh_del->hh_next; \
+ } \
+ if (hh_del->hh_next) { \
+ hh_del->hh_next->hh_prev = hh_del->hh_prev; \
+ }
+
+/* Bucket expansion has the effect of doubling the number of buckets
+ * and redistributing the items into the new buckets. Ideally the
+ * items will distribute more or less evenly into the new buckets
+ * (the extent to which this is true is a measure of the quality of
+ * the hash function as it applies to the key domain).
+ *
+ * With the items distributed into more buckets, the chain length
+ * (item count) in each bucket is reduced. Thus by expanding buckets
+ * the hash keeps a bound on the chain length. This bounded chain
+ * length is the essence of how a hash provides constant time lookup.
+ *
+ * The calculation of tbl->ideal_chain_maxlen below deserves some
+ * explanation. First, keep in mind that we're calculating the ideal
+ * maximum chain length based on the *new* (doubled) bucket count.
+ * In fractions this is just n/b (n=number of items,b=new num buckets).
+ * Since the ideal chain length is an integer, we want to calculate
+ * ceil(n/b). We don't depend on floating point arithmetic in this
+ * hash, so to calculate ceil(n/b) with integers we could write
+ *
+ * ceil(n/b) = (n/b) + ((n%b)?1:0)
+ *
+ * and in fact a previous version of this hash did just that.
+ * But now we have improved things a bit by recognizing that b is
+ * always a power of two. We keep its base 2 log handy (call it lb),
+ * so now we can write this with a bit shift and logical AND:
+ *
+ * ceil(n/b) = (n>>lb) + ( (n & (b-1)) ? 1:0)
+ *
+ */
+#define HASH_EXPAND_BUCKETS(tbl) \
+do { \
+ unsigned _he_bkt; \
+ unsigned _he_bkt_i; \
+ struct UT_hash_handle *_he_thh, *_he_hh_nxt; \
+ UT_hash_bucket *_he_new_buckets, *_he_newbkt; \
+ _he_new_buckets = (UT_hash_bucket*)uthash_malloc( \
+ 2 * tbl->num_buckets * sizeof(struct UT_hash_bucket)); \
+ if (!_he_new_buckets) { uthash_fatal( "out of memory"); } \
+ memset(_he_new_buckets, 0, \
+ 2 * tbl->num_buckets * sizeof(struct UT_hash_bucket)); \
+ tbl->ideal_chain_maxlen = \
+ (tbl->num_items >> (tbl->log2_num_buckets+1)) + \
+ ((tbl->num_items & ((tbl->num_buckets*2)-1)) ? 1 : 0); \
+ tbl->nonideal_items = 0; \
+ for(_he_bkt_i = 0; _he_bkt_i < tbl->num_buckets; _he_bkt_i++) \
+ { \
+ _he_thh = tbl->buckets[ _he_bkt_i ].hh_head; \
+ while (_he_thh) { \
+ _he_hh_nxt = _he_thh->hh_next; \
+ HASH_TO_BKT( _he_thh->hashv, tbl->num_buckets*2, _he_bkt); \
+ _he_newbkt = &(_he_new_buckets[ _he_bkt ]); \
+ if (++(_he_newbkt->count) > tbl->ideal_chain_maxlen) { \
+ tbl->nonideal_items++; \
+ _he_newbkt->expand_mult = _he_newbkt->count / \
+ tbl->ideal_chain_maxlen; \
+ } \
+ _he_thh->hh_prev = NULL; \
+ _he_thh->hh_next = _he_newbkt->hh_head; \
+ if (_he_newbkt->hh_head) _he_newbkt->hh_head->hh_prev = \
+ _he_thh; \
+ _he_newbkt->hh_head = _he_thh; \
+ _he_thh = _he_hh_nxt; \
+ } \
+ } \
+ uthash_free( tbl->buckets, tbl->num_buckets*sizeof(struct UT_hash_bucket) ); \
+ tbl->num_buckets *= 2; \
+ tbl->log2_num_buckets++; \
+ tbl->buckets = _he_new_buckets; \
+ tbl->ineff_expands = (tbl->nonideal_items > (tbl->num_items >> 1)) ? \
+ (tbl->ineff_expands+1) : 0; \
+ if (tbl->ineff_expands > 1) { \
+ tbl->noexpand=1; \
+ uthash_noexpand_fyi(tbl); \
+ } \
+ uthash_expand_fyi(tbl); \
+} while(0)
+
+
+/* This is an adaptation of Simon Tatham's O(n log(n)) mergesort */
+/* Note that HASH_SORT assumes the hash handle name to be hh.
+ * HASH_SRT was added to allow the hash handle name to be passed in. */
+#define HASH_SORT(head,cmpfcn) HASH_SRT(hh,head,cmpfcn)
+#define HASH_SRT(hh,head,cmpfcn) \
+do { \
+ unsigned _hs_i; \
+ unsigned _hs_looping,_hs_nmerges,_hs_insize,_hs_psize,_hs_qsize; \
+ struct UT_hash_handle *_hs_p, *_hs_q, *_hs_e, *_hs_list, *_hs_tail; \
+ if (head) { \
+ _hs_insize = 1; \
+ _hs_looping = 1; \
+ _hs_list = &((head)->hh); \
+ while (_hs_looping) { \
+ _hs_p = _hs_list; \
+ _hs_list = NULL; \
+ _hs_tail = NULL; \
+ _hs_nmerges = 0; \
+ while (_hs_p) { \
+ _hs_nmerges++; \
+ _hs_q = _hs_p; \
+ _hs_psize = 0; \
+ for ( _hs_i = 0; _hs_i < _hs_insize; _hs_i++ ) { \
+ _hs_psize++; \
+ _hs_q = (UT_hash_handle*)((_hs_q->next) ? \
+ ((void*)((char*)(_hs_q->next) + \
+ (head)->hh.tbl->hho)) : NULL); \
+ if (! (_hs_q) ) break; \
+ } \
+ _hs_qsize = _hs_insize; \
+ while ((_hs_psize > 0) || ((_hs_qsize > 0) && _hs_q )) { \
+ if (_hs_psize == 0) { \
+ _hs_e = _hs_q; \
+ _hs_q = (UT_hash_handle*)((_hs_q->next) ? \
+ ((void*)((char*)(_hs_q->next) + \
+ (head)->hh.tbl->hho)) : NULL); \
+ _hs_qsize--; \
+ } else if ( (_hs_qsize == 0) || !(_hs_q) ) { \
+ _hs_e = _hs_p; \
+ if (_hs_p){ \
+ _hs_p = (UT_hash_handle*)((_hs_p->next) ? \
+ ((void*)((char*)(_hs_p->next) + \
+ (head)->hh.tbl->hho)) : NULL); \
+ } \
+ _hs_psize--; \
+ } else if (( \
+ cmpfcn(DECLTYPE(head)(ELMT_FROM_HH((head)->hh.tbl,_hs_p)), \
+ DECLTYPE(head)(ELMT_FROM_HH((head)->hh.tbl,_hs_q))) \
+ ) <= 0) { \
+ _hs_e = _hs_p; \
+ if (_hs_p){ \
+ _hs_p = (UT_hash_handle*)((_hs_p->next) ? \
+ ((void*)((char*)(_hs_p->next) + \
+ (head)->hh.tbl->hho)) : NULL); \
+ } \
+ _hs_psize--; \
+ } else { \
+ _hs_e = _hs_q; \
+ _hs_q = (UT_hash_handle*)((_hs_q->next) ? \
+ ((void*)((char*)(_hs_q->next) + \
+ (head)->hh.tbl->hho)) : NULL); \
+ _hs_qsize--; \
+ } \
+ if ( _hs_tail ) { \
+ _hs_tail->next = ((_hs_e) ? \
+ ELMT_FROM_HH((head)->hh.tbl,_hs_e) : NULL); \
+ } else { \
+ _hs_list = _hs_e; \
+ } \
+ if (_hs_e) { \
+ _hs_e->prev = ((_hs_tail) ? \
+ ELMT_FROM_HH((head)->hh.tbl,_hs_tail) : NULL); \
+ } \
+ _hs_tail = _hs_e; \
+ } \
+ _hs_p = _hs_q; \
+ } \
+ if (_hs_tail){ \
+ _hs_tail->next = NULL; \
+ } \
+ if ( _hs_nmerges <= 1 ) { \
+ _hs_looping=0; \
+ (head)->hh.tbl->tail = _hs_tail; \
+ DECLTYPE_ASSIGN(head,ELMT_FROM_HH((head)->hh.tbl, _hs_list)); \
+ } \
+ _hs_insize *= 2; \
+ } \
+ HASH_FSCK(hh,head); \
+ } \
+} while (0)
+
+/* This function selects items from one hash into another hash.
+ * The end result is that the selected items have dual presence
+ * in both hashes. There is no copy of the items made; rather
+ * they are added into the new hash through a secondary hash
+ * hash handle that must be present in the structure. */
+#define HASH_SELECT(hh_dst, dst, hh_src, src, cond) \
+do { \
+ unsigned _src_bkt, _dst_bkt; \
+ void *_last_elt=NULL, *_elt; \
+ UT_hash_handle *_src_hh, *_dst_hh, *_last_elt_hh=NULL; \
+ ptrdiff_t _dst_hho = ((char*)(&(dst)->hh_dst) - (char*)(dst)); \
+ if (src) { \
+ for(_src_bkt=0; _src_bkt < (src)->hh_src.tbl->num_buckets; _src_bkt++) { \
+ for(_src_hh = (src)->hh_src.tbl->buckets[_src_bkt].hh_head; \
+ _src_hh; \
+ _src_hh = _src_hh->hh_next) { \
+ _elt = ELMT_FROM_HH((src)->hh_src.tbl, _src_hh); \
+ if (cond(_elt)) { \
+ _dst_hh = (UT_hash_handle*)(((char*)_elt) + _dst_hho); \
+ _dst_hh->key = _src_hh->key; \
+ _dst_hh->keylen = _src_hh->keylen; \
+ _dst_hh->hashv = _src_hh->hashv; \
+ _dst_hh->prev = _last_elt; \
+ _dst_hh->next = NULL; \
+ if (_last_elt_hh) { _last_elt_hh->next = _elt; } \
+ if (!dst) { \
+ DECLTYPE_ASSIGN(dst,_elt); \
+ HASH_MAKE_TABLE(hh_dst,dst); \
+ } else { \
+ _dst_hh->tbl = (dst)->hh_dst.tbl; \
+ } \
+ HASH_TO_BKT(_dst_hh->hashv, _dst_hh->tbl->num_buckets, _dst_bkt); \
+ HASH_ADD_TO_BKT(_dst_hh->tbl->buckets[_dst_bkt],_dst_hh); \
+ (dst)->hh_dst.tbl->num_items++; \
+ _last_elt = _elt; \
+ _last_elt_hh = _dst_hh; \
+ } \
+ } \
+ } \
+ } \
+ HASH_FSCK(hh_dst,dst); \
+} while (0)
+
+#define HASH_CLEAR(hh,head) \
+do { \
+ if (head) { \
+ uthash_free((head)->hh.tbl->buckets, \
+ (head)->hh.tbl->num_buckets*sizeof(struct UT_hash_bucket)); \
+ HASH_BLOOM_FREE((head)->hh.tbl); \
+ uthash_free((head)->hh.tbl, sizeof(UT_hash_table)); \
+ (head)=NULL; \
+ } \
+} while(0)
+
+#define HASH_OVERHEAD(hh,head) \
+ (size_t)((((head)->hh.tbl->num_items * sizeof(UT_hash_handle)) + \
+ ((head)->hh.tbl->num_buckets * sizeof(UT_hash_bucket)) + \
+ (sizeof(UT_hash_table)) + \
+ (HASH_BLOOM_BYTELEN)))
+
+#ifdef NO_DECLTYPE
+#define HASH_ITER(hh,head,el,tmp) \
+for((el)=(head), (*(char**)(&(tmp)))=(char*)((head)?(head)->hh.next:NULL); \
+ el; (el)=(tmp),(*(char**)(&(tmp)))=(char*)((tmp)?(tmp)->hh.next:NULL))
+#else
+#define HASH_ITER(hh,head,el,tmp) \
+for((el)=(head),(tmp)=DECLTYPE(el)((head)?(head)->hh.next:NULL); \
+ el; (el)=(tmp),(tmp)=DECLTYPE(el)((tmp)?(tmp)->hh.next:NULL))
+#endif
+
+/* obtain a count of items in the hash */
+#define HASH_COUNT(head) HASH_CNT(hh,head)
+#define HASH_CNT(hh,head) ((head)?((head)->hh.tbl->num_items):0)
+
+typedef struct UT_hash_bucket {
+ struct UT_hash_handle *hh_head;
+ unsigned count;
+
+ /* expand_mult is normally set to 0. In this situation, the max chain length
+ * threshold is enforced at its default value, HASH_BKT_CAPACITY_THRESH. (If
+ * the bucket's chain exceeds this length, bucket expansion is triggered).
+ * However, setting expand_mult to a non-zero value delays bucket expansion
+ * (that would be triggered by additions to this particular bucket)
+ * until its chain length reaches a *multiple* of HASH_BKT_CAPACITY_THRESH.
+ * (The multiplier is simply expand_mult+1). The whole idea of this
+ * multiplier is to reduce bucket expansions, since they are expensive, in
+ * situations where we know that a particular bucket tends to be overused.
+ * It is better to let its chain length grow to a longer yet-still-bounded
+ * value, than to do an O(n) bucket expansion too often.
+ */
+ unsigned expand_mult;
+
+} UT_hash_bucket;
+
+/* random signature used only to find hash tables in external analysis */
+#define HASH_SIGNATURE 0xa0111fe1
+#define HASH_BLOOM_SIGNATURE 0xb12220f2
+
+typedef struct UT_hash_table {
+ UT_hash_bucket *buckets;
+ unsigned num_buckets, log2_num_buckets;
+ unsigned num_items;
+ struct UT_hash_handle *tail; /* tail hh in app order, for fast append */
+ ptrdiff_t hho; /* hash handle offset (byte pos of hash handle in element */
+
+ /* in an ideal situation (all buckets used equally), no bucket would have
+ * more than ceil(#items/#buckets) items. that's the ideal chain length. */
+ unsigned ideal_chain_maxlen;
+
+ /* nonideal_items is the number of items in the hash whose chain position
+ * exceeds the ideal chain maxlen. these items pay the penalty for an uneven
+ * hash distribution; reaching them in a chain traversal takes >ideal steps */
+ unsigned nonideal_items;
+
+ /* ineffective expands occur when a bucket doubling was performed, but
+ * afterward, more than half the items in the hash had nonideal chain
+ * positions. If this happens on two consecutive expansions we inhibit any
+ * further expansion, as it's not helping; this happens when the hash
+ * function isn't a good fit for the key domain. When expansion is inhibited
+ * the hash will still work, albeit no longer in constant time. */
+ unsigned ineff_expands, noexpand;
+
+ uint32_t signature; /* used only to find hash tables in external analysis */
+#ifdef HASH_BLOOM
+ uint32_t bloom_sig; /* used only to test bloom exists in external analysis */
+ uint8_t *bloom_bv;
+ char bloom_nbits;
+#endif
+
+} UT_hash_table;
+
+typedef struct UT_hash_handle {
+ struct UT_hash_table *tbl;
+ void *prev; /* prev element in app order */
+ void *next; /* next element in app order */
+ struct UT_hash_handle *hh_prev; /* previous hh in bucket order */
+ struct UT_hash_handle *hh_next; /* next hh in bucket order */
+ const void *key; /* ptr to enclosing struct's key */
+ unsigned keylen; /* enclosing struct's key len */
+ unsigned hashv; /* result of hash-fcn(key) */
+} UT_hash_handle;
+
+#endif /* UTHASH_H */