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- From: Benjamin Barenblat <bbaren@mit.edu>
- Subject: Use Debian’s uthash
- Forwarded: no
- Remove upstream’s vendored copy of uthash.
- --- a/include/urweb/types_cpp.h
- +++ b/include/urweb/types_cpp.h
- @@ -123,7 +123,7 @@ typedef struct {
- // Caching
-
- #include <pthread.h>
- -#include "uthash.h"
- +#include <uthash.h>
-
- typedef struct uw_Sqlcache_Value {
- char *result;
- --- a/src/c/urweb.c
- +++ b/src/c/urweb.c
- @@ -22,7 +22,7 @@
-
- #include "types.h"
-
- -#include "uthash.h"
- +#include <uthash.h>
-
- uw_unit uw_unit_v = 0;
-
- --- a/include/urweb/uthash.h
- +++ /dev/null
- @@ -1,963 +0,0 @@
- -/*
- -Copyright (c) 2003-2014, 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() */
- -
- -/* 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. */
- -#if defined(_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
- -#elif defined(__BORLANDC__) || defined(__LCC__) || defined(__WATCOMC__)
- -#define NO_DECLTYPE
- -#define DECLTYPE(x)
- -#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 Pre VS2010 */
- -#if defined (_WIN32)
- -#if defined(_MSC_VER) && _MSC_VER >= 1600
- -#include <stdint.h>
- -#elif defined(__WATCOMC__)
- -#include <stdint.h>
- -#else
- -typedef unsigned int uint32_t;
- -typedef unsigned char uint8_t;
- -#endif
- -#else
- -#include <stdint.h>
- -#endif
- -
- -#define UTHASH_VERSION 1.9.9
- -
- -#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 32U /* initial number of buckets */
- -#define HASH_INITIAL_NUM_BUCKETS_LOG2 5U /* lg2 of initial number of buckets */
- -#define HASH_BKT_CAPACITY_THRESH 10U /* 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 { \
- - out=NULL; \
- - if (head != NULL) { \
- - unsigned _hf_bkt,_hf_hashv; \
- - HASH_FCN(keyptr,keylen, (head)->hh.tbl->num_buckets, _hf_hashv, _hf_bkt); \
- - if (HASH_BLOOM_TEST((head)->hh.tbl, _hf_hashv) != 0) { \
- - 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 (1UL << HASH_BLOOM)
- -#define HASH_BLOOM_BYTELEN (HASH_BLOOM_BITLEN/8UL) + (((HASH_BLOOM_BITLEN%8UL)!=0UL) ? 1UL : 0UL)
- -#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)/8U] |= (1U << ((idx)%8U)))
- -#define HASH_BLOOM_BITTEST(bv,idx) (bv[(idx)/8U] & (1U << ((idx)%8U)))
- -
- -#define HASH_BLOOM_ADD(tbl,hashv) \
- - HASH_BLOOM_BITSET((tbl)->bloom_bv, (hashv & (uint32_t)((1ULL << (tbl)->bloom_nbits) - 1U)))
- -
- -#define HASH_BLOOM_TEST(tbl,hashv) \
- - HASH_BLOOM_BITTEST((tbl)->bloom_bv, (hashv & (uint32_t)((1ULL << (tbl)->bloom_nbits) - 1U)))
- -
- -#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 0U
- -#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 = (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) - 1U)); \
- -} 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 { \
- - 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 { \
- - unsigned _hd_bkt; \
- - _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 != NULL) { \
- - ((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 != NULL) { \
- - ((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,(unsigned)strlen(findstr),out)
- -#define HASH_ADD_STR(head,strfield,add) \
- - HASH_ADD(hh,head,strfield[0],(unsigned int)strlen(add->strfield),add)
- -#define HASH_REPLACE_STR(head,strfield,add,replaced) \
- - HASH_REPLACE(hh,head,strfield[0],(unsigned)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,replaced) \
- - 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 { \
- - struct UT_hash_handle *_thh; \
- - if (head) { \
- - unsigned _bkt_i; \
- - unsigned _count; \
- - char *_prev; \
- - _count = 0; \
- - for( _bkt_i = 0; _bkt_i < (head)->hh.tbl->num_buckets; _bkt_i++) { \
- - unsigned _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 %u, actual %u\n", \
- - (head)->hh.tbl->buckets[_bkt_i].count, _bkt_count); \
- - } \
- - } \
- - if (_count != (head)->hh.tbl->num_items) { \
- - HASH_OOPS("invalid hh item count %u, actual %u\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 %u, actual %u\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, (unsigned long)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_JEN
- -#endif
- -
- -/* The Bernstein hash function, used in Perl prior to v5.6. Note (x<<5+x)=x*33. */
- -#define HASH_BER(key,keylen,num_bkts,hashv,bkt) \
- -do { \
- - unsigned _hb_keylen=(unsigned)keylen; \
- - const unsigned char *_hb_key=(const unsigned char*)(key); \
- - (hashv) = 0; \
- - while (_hb_keylen-- != 0U) { \
- - (hashv) = (((hashv) << 5) + (hashv)) + *_hb_key++; \
- - } \
- - bkt = (hashv) & (num_bkts-1U); \
- -} while (0)
- -
- -
- -/* SAX/FNV/OAT/JEN hash functions are macro variants of those listed at
- - * http://eternallyconfuzzled.com/tuts/algorithms/jsw_tut_hashing.aspx */
- -#define HASH_SAX(key,keylen,num_bkts,hashv,bkt) \
- -do { \
- - unsigned _sx_i; \
- - const unsigned char *_hs_key=(const unsigned char*)(key); \
- - hashv = 0; \
- - for(_sx_i=0; _sx_i < keylen; _sx_i++) { \
- - hashv ^= (hashv << 5) + (hashv >> 2) + _hs_key[_sx_i]; \
- - } \
- - bkt = hashv & (num_bkts-1U); \
- -} while (0)
- -/* FNV-1a variation */
- -#define HASH_FNV(key,keylen,num_bkts,hashv,bkt) \
- -do { \
- - unsigned _fn_i; \
- - const unsigned char *_hf_key=(const unsigned char*)(key); \
- - hashv = 2166136261U; \
- - for(_fn_i=0; _fn_i < keylen; _fn_i++) { \
- - hashv = hashv ^ _hf_key[_fn_i]; \
- - hashv = hashv * 16777619U; \
- - } \
- - bkt = hashv & (num_bkts-1U); \
- -} while(0)
- -
- -#define HASH_OAT(key,keylen,num_bkts,hashv,bkt) \
- -do { \
- - unsigned _ho_i; \
- - const unsigned char *_ho_key=(const unsigned char*)(key); \
- - hashv = 0; \
- - for(_ho_i=0; _ho_i < keylen; _ho_i++) { \
- - hashv += _ho_key[_ho_i]; \
- - hashv += (hashv << 10); \
- - hashv ^= (hashv >> 6); \
- - } \
- - hashv += (hashv << 3); \
- - hashv ^= (hashv >> 11); \
- - hashv += (hashv << 15); \
- - bkt = hashv & (num_bkts-1U); \
- -} while(0)
- -
- -#define HASH_JEN_MIX(a,b,c) \
- -do { \
- - a -= b; a -= c; a ^= ( c >> 13 ); \
- - b -= c; b -= a; b ^= ( a << 8 ); \
- - c -= a; c -= b; c ^= ( b >> 13 ); \
- - a -= b; a -= c; a ^= ( c >> 12 ); \
- - b -= c; b -= a; b ^= ( a << 16 ); \
- - c -= a; c -= b; c ^= ( b >> 5 ); \
- - a -= b; a -= c; a ^= ( c >> 3 ); \
- - b -= c; b -= a; b ^= ( a << 10 ); \
- - c -= a; c -= b; c ^= ( b >> 15 ); \
- -} while (0)
- -
- -#define HASH_JEN(key,keylen,num_bkts,hashv,bkt) \
- -do { \
- - unsigned _hj_i,_hj_j,_hj_k; \
- - unsigned const char *_hj_key=(unsigned const char*)(key); \
- - hashv = 0xfeedbeefu; \
- - _hj_i = _hj_j = 0x9e3779b9u; \
- - _hj_k = (unsigned)(keylen); \
- - while (_hj_k >= 12U) { \
- - _hj_i += (_hj_key[0] + ( (unsigned)_hj_key[1] << 8 ) \
- - + ( (unsigned)_hj_key[2] << 16 ) \
- - + ( (unsigned)_hj_key[3] << 24 ) ); \
- - _hj_j += (_hj_key[4] + ( (unsigned)_hj_key[5] << 8 ) \
- - + ( (unsigned)_hj_key[6] << 16 ) \
- - + ( (unsigned)_hj_key[7] << 24 ) ); \
- - hashv += (_hj_key[8] + ( (unsigned)_hj_key[9] << 8 ) \
- - + ( (unsigned)_hj_key[10] << 16 ) \
- - + ( (unsigned)_hj_key[11] << 24 ) ); \
- - \
- - HASH_JEN_MIX(_hj_i, _hj_j, hashv); \
- - \
- - _hj_key += 12; \
- - _hj_k -= 12U; \
- - } \
- - hashv += (unsigned)(keylen); \
- - switch ( _hj_k ) { \
- - case 11: hashv += ( (unsigned)_hj_key[10] << 24 ); /* FALLTHROUGH */ \
- - case 10: hashv += ( (unsigned)_hj_key[9] << 16 ); /* FALLTHROUGH */ \
- - case 9: hashv += ( (unsigned)_hj_key[8] << 8 ); /* FALLTHROUGH */ \
- - case 8: _hj_j += ( (unsigned)_hj_key[7] << 24 ); /* FALLTHROUGH */ \
- - case 7: _hj_j += ( (unsigned)_hj_key[6] << 16 ); /* FALLTHROUGH */ \
- - case 6: _hj_j += ( (unsigned)_hj_key[5] << 8 ); /* FALLTHROUGH */ \
- - case 5: _hj_j += _hj_key[4]; /* FALLTHROUGH */ \
- - case 4: _hj_i += ( (unsigned)_hj_key[3] << 24 ); /* FALLTHROUGH */ \
- - case 3: _hj_i += ( (unsigned)_hj_key[2] << 16 ); /* FALLTHROUGH */ \
- - case 2: _hj_i += ( (unsigned)_hj_key[1] << 8 ); /* FALLTHROUGH */ \
- - case 1: _hj_i += _hj_key[0]; \
- - } \
- - HASH_JEN_MIX(_hj_i, _hj_j, hashv); \
- - bkt = hashv & (num_bkts-1U); \
- -} while(0)
- -
- -/* The Paul Hsieh hash function */
- -#undef get16bits
- -#if (defined(__GNUC__) && defined(__i386__)) || defined(__WATCOMC__) \
- - || defined(_MSC_VER) || defined (__BORLANDC__) || defined (__TURBOC__)
- -#define get16bits(d) (*((const uint16_t *) (d)))
- -#endif
- -
- -#if !defined (get16bits)
- -#define get16bits(d) ((((uint32_t)(((const uint8_t *)(d))[1])) << 8) \
- - +(uint32_t)(((const uint8_t *)(d))[0]) )
- -#endif
- -#define HASH_SFH(key,keylen,num_bkts,hashv,bkt) \
- -do { \
- - unsigned const char *_sfh_key=(unsigned const char*)(key); \
- - uint32_t _sfh_tmp, _sfh_len = (uint32_t)keylen; \
- - \
- - unsigned _sfh_rem = _sfh_len & 3U; \
- - _sfh_len >>= 2; \
- - hashv = 0xcafebabeu; \
- - \
- - /* Main loop */ \
- - for (;_sfh_len > 0U; _sfh_len--) { \
- - hashv += get16bits (_sfh_key); \
- - _sfh_tmp = ((uint32_t)(get16bits (_sfh_key+2)) << 11) ^ hashv; \
- - hashv = (hashv << 16) ^ _sfh_tmp; \
- - _sfh_key += 2U*sizeof (uint16_t); \
- - hashv += hashv >> 11; \
- - } \
- - \
- - /* Handle end cases */ \
- - switch (_sfh_rem) { \
- - case 3: hashv += get16bits (_sfh_key); \
- - hashv ^= hashv << 16; \
- - hashv ^= (uint32_t)(_sfh_key[sizeof (uint16_t)]) << 18; \
- - hashv += hashv >> 11; \
- - break; \
- - case 2: hashv += get16bits (_sfh_key); \
- - hashv ^= hashv << 11; \
- - hashv += hashv >> 17; \
- - break; \
- - case 1: hashv += *_sfh_key; \
- - hashv ^= hashv << 10; \
- - hashv += hashv >> 1; \
- - } \
- - \
- - /* Force "avalanching" of final 127 bits */ \
- - hashv ^= hashv << 3; \
- - hashv += hashv >> 5; \
- - hashv ^= hashv << 4; \
- - hashv += hashv >> 17; \
- - hashv ^= hashv << 25; \
- - hashv += hashv >> 6; \
- - bkt = hashv & (num_bkts-1U); \
- -} while(0)
- -
- -#ifdef HASH_USING_NO_STRICT_ALIASING
- -/* The MurmurHash exploits some CPU's (x86,x86_64) tolerance for unaligned reads.
- - * For other types of CPU's (e.g. Sparc) an unaligned read causes a bus error.
- - * MurmurHash uses the faster approach only on CPU's where we know it's safe.
- - *
- - * Note the preprocessor built-in defines can be emitted using:
- - *
- - * gcc -m64 -dM -E - < /dev/null (on gcc)
- - * cc -## a.c (where a.c is a simple test file) (Sun Studio)
- - */
- -#if (defined(__i386__) || defined(__x86_64__) || defined(_M_IX86))
- -#define MUR_GETBLOCK(p,i) p[i]
- -#else /* non intel */
- -#define MUR_PLUS0_ALIGNED(p) (((unsigned long)p & 3UL) == 0UL)
- -#define MUR_PLUS1_ALIGNED(p) (((unsigned long)p & 3UL) == 1UL)
- -#define MUR_PLUS2_ALIGNED(p) (((unsigned long)p & 3UL) == 2UL)
- -#define MUR_PLUS3_ALIGNED(p) (((unsigned long)p & 3UL) == 3UL)
- -#define WP(p) ((uint32_t*)((unsigned long)(p) & ~3UL))
- -#if (defined(__BIG_ENDIAN__) || defined(SPARC) || defined(__ppc__) || defined(__ppc64__))
- -#define MUR_THREE_ONE(p) ((((*WP(p))&0x00ffffff) << 8) | (((*(WP(p)+1))&0xff000000) >> 24))
- -#define MUR_TWO_TWO(p) ((((*WP(p))&0x0000ffff) <<16) | (((*(WP(p)+1))&0xffff0000) >> 16))
- -#define MUR_ONE_THREE(p) ((((*WP(p))&0x000000ff) <<24) | (((*(WP(p)+1))&0xffffff00) >> 8))
- -#else /* assume little endian non-intel */
- -#define MUR_THREE_ONE(p) ((((*WP(p))&0xffffff00) >> 8) | (((*(WP(p)+1))&0x000000ff) << 24))
- -#define MUR_TWO_TWO(p) ((((*WP(p))&0xffff0000) >>16) | (((*(WP(p)+1))&0x0000ffff) << 16))
- -#define MUR_ONE_THREE(p) ((((*WP(p))&0xff000000) >>24) | (((*(WP(p)+1))&0x00ffffff) << 8))
- -#endif
- -#define MUR_GETBLOCK(p,i) (MUR_PLUS0_ALIGNED(p) ? ((p)[i]) : \
- - (MUR_PLUS1_ALIGNED(p) ? MUR_THREE_ONE(p) : \
- - (MUR_PLUS2_ALIGNED(p) ? MUR_TWO_TWO(p) : \
- - MUR_ONE_THREE(p))))
- -#endif
- -#define MUR_ROTL32(x,r) (((x) << (r)) | ((x) >> (32 - (r))))
- -#define MUR_FMIX(_h) \
- -do { \
- - _h ^= _h >> 16; \
- - _h *= 0x85ebca6bu; \
- - _h ^= _h >> 13; \
- - _h *= 0xc2b2ae35u; \
- - _h ^= _h >> 16; \
- -} while(0)
- -
- -#define HASH_MUR(key,keylen,num_bkts,hashv,bkt) \
- -do { \
- - const uint8_t *_mur_data = (const uint8_t*)(key); \
- - const int _mur_nblocks = (int)(keylen) / 4; \
- - uint32_t _mur_h1 = 0xf88D5353u; \
- - uint32_t _mur_c1 = 0xcc9e2d51u; \
- - uint32_t _mur_c2 = 0x1b873593u; \
- - uint32_t _mur_k1 = 0; \
- - const uint8_t *_mur_tail; \
- - const uint32_t *_mur_blocks = (const uint32_t*)(_mur_data+(_mur_nblocks*4)); \
- - int _mur_i; \
- - for(_mur_i = -_mur_nblocks; _mur_i!=0; _mur_i++) { \
- - _mur_k1 = MUR_GETBLOCK(_mur_blocks,_mur_i); \
- - _mur_k1 *= _mur_c1; \
- - _mur_k1 = MUR_ROTL32(_mur_k1,15); \
- - _mur_k1 *= _mur_c2; \
- - \
- - _mur_h1 ^= _mur_k1; \
- - _mur_h1 = MUR_ROTL32(_mur_h1,13); \
- - _mur_h1 = (_mur_h1*5U) + 0xe6546b64u; \
- - } \
- - _mur_tail = (const uint8_t*)(_mur_data + (_mur_nblocks*4)); \
- - _mur_k1=0; \
- - switch((keylen) & 3U) { \
- - case 3: _mur_k1 ^= (uint32_t)_mur_tail[2] << 16; /* FALLTHROUGH */ \
- - case 2: _mur_k1 ^= (uint32_t)_mur_tail[1] << 8; /* FALLTHROUGH */ \
- - case 1: _mur_k1 ^= (uint32_t)_mur_tail[0]; \
- - _mur_k1 *= _mur_c1; \
- - _mur_k1 = MUR_ROTL32(_mur_k1,15); \
- - _mur_k1 *= _mur_c2; \
- - _mur_h1 ^= _mur_k1; \
- - } \
- - _mur_h1 ^= (uint32_t)(keylen); \
- - MUR_FMIX(_mur_h1); \
- - hashv = _mur_h1; \
- - bkt = hashv & (num_bkts-1U); \
- -} while(0)
- -#endif /* HASH_USING_NO_STRICT_ALIASING */
- -
- -/* key comparison function; return 0 if keys equal */
- -#define HASH_KEYCMP(a,b,len) memcmp(a,b,(unsigned long)(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 != NULL) { DECLTYPE_ASSIGN(out,ELMT_FROM_HH(tbl,head.hh_head)); } \
- - else { out=NULL; } \
- - while (out != NULL) { \
- - if ((out)->hh.keylen == (keylen_in)) { \
- - if ((HASH_KEYCMP((out)->hh.key,keyptr,keylen_in)) == 0) { break; } \
- - } \
- - if ((out)->hh.hh_next != NULL) { 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 != NULL) { (head).hh_head->hh_prev = (addhh); } \
- - (head).hh_head=addhh; \
- - if ((head.count >= ((head.expand_mult+1U) * HASH_BKT_CAPACITY_THRESH)) \
- - && ((addhh)->tbl->noexpand != 1U)) { \
- - 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( \
- - 2UL * tbl->num_buckets * sizeof(struct UT_hash_bucket)); \
- - if (!_he_new_buckets) { uthash_fatal( "out of memory"); } \
- - memset(_he_new_buckets, 0, \
- - 2UL * tbl->num_buckets * sizeof(struct UT_hash_bucket)); \
- - tbl->ideal_chain_maxlen = \
- - (tbl->num_items >> (tbl->log2_num_buckets+1U)) + \
- - (((tbl->num_items & ((tbl->num_buckets*2U)-1U)) != 0U) ? 1U : 0U); \
- - 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 != NULL) { \
- - _he_hh_nxt = _he_thh->hh_next; \
- - HASH_TO_BKT( _he_thh->hashv, tbl->num_buckets*2U, _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 != NULL) { _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 *= 2U; \
- - tbl->log2_num_buckets++; \
- - tbl->buckets = _he_new_buckets; \
- - tbl->ineff_expands = (tbl->nonideal_items > (tbl->num_items >> 1)) ? \
- - (tbl->ineff_expands+1U) : 0U; \
- - if (tbl->ineff_expands > 1U) { \
- - 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 != NULL) { \
- - _hs_insize = 1; \
- - _hs_looping = 1; \
- - _hs_list = &((head)->hh); \
- - while (_hs_looping != 0U) { \
- - _hs_p = _hs_list; \
- - _hs_list = NULL; \
- - _hs_tail = NULL; \
- - _hs_nmerges = 0; \
- - while (_hs_p != NULL) { \
- - _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 != NULL) ? \
- - ((void*)((char*)(_hs_q->next) + \
- - (head)->hh.tbl->hho)) : NULL); \
- - if (! (_hs_q) ) { break; } \
- - } \
- - _hs_qsize = _hs_insize; \
- - while ((_hs_psize > 0U) || ((_hs_qsize > 0U) && (_hs_q != NULL))) {\
- - if (_hs_psize == 0U) { \
- - _hs_e = _hs_q; \
- - _hs_q = (UT_hash_handle*)((_hs_q->next != NULL) ? \
- - ((void*)((char*)(_hs_q->next) + \
- - (head)->hh.tbl->hho)) : NULL); \
- - _hs_qsize--; \
- - } else if ( (_hs_qsize == 0U) || (_hs_q == NULL) ) { \
- - _hs_e = _hs_p; \
- - if (_hs_p != NULL){ \
- - _hs_p = (UT_hash_handle*)((_hs_p->next != NULL) ? \
- - ((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 != NULL){ \
- - _hs_p = (UT_hash_handle*)((_hs_p->next != NULL) ? \
- - ((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 != NULL) ? \
- - ((void*)((char*)(_hs_q->next) + \
- - (head)->hh.tbl->hho)) : NULL); \
- - _hs_qsize--; \
- - } \
- - if ( _hs_tail != NULL ) { \
- - _hs_tail->next = ((_hs_e != NULL) ? \
- - ELMT_FROM_HH((head)->hh.tbl,_hs_e) : NULL); \
- - } else { \
- - _hs_list = _hs_e; \
- - } \
- - if (_hs_e != NULL) { \
- - _hs_e->prev = ((_hs_tail != NULL) ? \
- - ELMT_FROM_HH((head)->hh.tbl,_hs_tail) : NULL); \
- - } \
- - _hs_tail = _hs_e; \
- - } \
- - _hs_p = _hs_q; \
- - } \
- - if (_hs_tail != NULL){ \
- - _hs_tail->next = NULL; \
- - } \
- - if ( _hs_nmerges <= 1U ) { \
- - _hs_looping=0; \
- - (head)->hh.tbl->tail = _hs_tail; \
- - DECLTYPE_ASSIGN(head,ELMT_FROM_HH((head)->hh.tbl, _hs_list)); \
- - } \
- - _hs_insize *= 2U; \
- - } \
- - 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 != NULL) { \
- - 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 != NULL; \
- - _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 != NULL) { _last_elt_hh->next = _elt; } \
- - if (dst == NULL) { \
- - 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 != 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; \
- - } \
- -} while(0)
- -
- -#define HASH_OVERHEAD(hh,head) \
- - ((head != NULL) ? ( \
- - (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))) : 0U)
- -
- -#ifdef NO_DECLTYPE
- -#define HASH_ITER(hh,head,el,tmp) \
- -for(((el)=(head)), ((*(char**)(&(tmp)))=(char*)((head!=NULL)?(head)->hh.next:NULL)); \
- - (el) != NULL; ((el)=(tmp)), ((*(char**)(&(tmp)))=(char*)((tmp!=NULL)?(tmp)->hh.next:NULL)))
- -#else
- -#define HASH_ITER(hh,head,el,tmp) \
- -for(((el)=(head)), ((tmp)=DECLTYPE(el)((head!=NULL)?(head)->hh.next:NULL)); \
- - (el) != NULL; ((el)=(tmp)), ((tmp)=DECLTYPE(el)((tmp!=NULL)?(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 != NULL)?((head)->hh.tbl->num_items):0U)
- -
- -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 0xa0111fe1u
- -#define HASH_BLOOM_SIGNATURE 0xb12220f2u
- -
- -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;
- - uint8_t 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 */
- - 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 */
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