lassik
/
upscheme
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity
upscheme/llt/htable.inc

142 lines
9.5 KiB
PHP
Raw Normal View History

support reading hex float literals better text representation of infs and nans removing construction of low-level numeric types directly from strings adding hash function corresponding to equal better way to initialize builtins moving advanced bitvector ops to separate compilation unit rearranging hash table code so it can be specialized for different comparison functions one good way to bloat a piece of software is to add several ASCII pictures of the mona lisa
2008-11-23 02:12:37 -05:00
//-*- mode:c -*-
/*
include this file and call HTIMPL to generate an implementation
*/
#define hash_size(h) ((h)->size/2)
// compute empirical max-probe for a given size
#define max_probe(size) ((size)>>5)
#define HTIMPL(HTNAME, HFUNC, EQFUNC) \
static void **HTNAME##_lookup_bp(htable_t *h, void *key) \
{ \
uint_t hv; \
size_t i, orig, index, iter; \
size_t newsz, sz = hash_size(h); \
size_t maxprobe = max_probe(sz); \
void **tab = h->table; \
void **ol; \
\
hv = HFUNC((uptrint_t)key); \
retry_bp: \
iter = 0; \
index = (index_t)(hv & (sz-1)) * 2; \
sz *= 2; \
orig = index; \
\
do { \
if (tab[index+1] == HT_NOTFOUND) { \
tab[index] = key; \
return &tab[index+1]; \
} \
\
if (EQFUNC(key, tab[index])) \
return &tab[index+1]; \
\
index = (index+2) & (sz-1); \
iter++; \
if (iter > maxprobe) \
break; \
} while (index != orig); \
\
/* table full */ \
/* quadruple size, rehash, retry the insert */ \
/* it's important to grow the table really fast; otherwise we waste */ \
/* lots of time rehashing all the keys over and over. */ \
sz = h->size; \
ol = h->table; \
if (sz >= (1<<19)) \
newsz = sz<<1; \
else \
newsz = sz<<2; \
/*printf("trying to allocate %d words.\n", newsz); fflush(stdout);*/ \
tab = (void**)malloc(newsz*sizeof(void*)); \
if (tab == NULL) \
return NULL; \
for(i=0; i < newsz; i++) \
tab[i] = HT_NOTFOUND; \
h->table = tab; \
h->size = newsz; \
for(i=0; i < sz; i+=2) { \
adding equalhash.c some cleanup moving some library code around for size optimization now using == instead of flt_equals for float comparison, mostly for hash compatibility
2008-11-28 16:44:59 -05:00
if (ol[i+1] != HT_NOTFOUND) { \
support reading hex float literals better text representation of infs and nans removing construction of low-level numeric types directly from strings adding hash function corresponding to equal better way to initialize builtins moving advanced bitvector ops to separate compilation unit rearranging hash table code so it can be specialized for different comparison functions one good way to bloat a piece of software is to add several ASCII pictures of the mona lisa
2008-11-23 02:12:37 -05:00
(*HTNAME##_lookup_bp(h, ol[i])) = ol[i+1]; \
} \
} \
free(ol); \
\
sz = hash_size(h); \
maxprobe = max_probe(sz); \
\
goto retry_bp; \
\
return NULL; \
} \
\
void HTNAME##_put(htable_t *h, void *key, void *val) \
{ \
void **bp = HTNAME##_lookup_bp(h, key); \
\
*bp = val; \
} \
\
void **HTNAME##_bp(htable_t *h, void *key) \
{ \
return HTNAME##_lookup_bp(h, key); \
} \
\
/* returns bp if key is in hash, otherwise NULL */ \
adding equalhash.c some cleanup moving some library code around for size optimization now using == instead of flt_equals for float comparison, mostly for hash compatibility
2008-11-28 16:44:59 -05:00
/* if return is non-NULL and *bp == HT_NOTFOUND then key was deleted */ \
support reading hex float literals better text representation of infs and nans removing construction of low-level numeric types directly from strings adding hash function corresponding to equal better way to initialize builtins moving advanced bitvector ops to separate compilation unit rearranging hash table code so it can be specialized for different comparison functions one good way to bloat a piece of software is to add several ASCII pictures of the mona lisa
2008-11-23 02:12:37 -05:00
static void **HTNAME##_peek_bp(htable_t *h, void *key) \
{ \
size_t sz = hash_size(h); \
size_t maxprobe = max_probe(sz); \
void **tab = h->table; \
size_t index = (index_t)(HFUNC((uptrint_t)key) & (sz-1)) * 2; \
sz *= 2; \
size_t orig = index; \
size_t iter = 0; \
\
do { \
if (tab[index] == HT_NOTFOUND) \
return NULL; \
adding equalhash.c some cleanup moving some library code around for size optimization now using == instead of flt_equals for float comparison, mostly for hash compatibility
2008-11-28 16:44:59 -05:00
if (EQFUNC(key, tab[index])) \
support reading hex float literals better text representation of infs and nans removing construction of low-level numeric types directly from strings adding hash function corresponding to equal better way to initialize builtins moving advanced bitvector ops to separate compilation unit rearranging hash table code so it can be specialized for different comparison functions one good way to bloat a piece of software is to add several ASCII pictures of the mona lisa
2008-11-23 02:12:37 -05:00
return &tab[index+1]; \
\
index = (index+2) & (sz-1); \
iter++; \
if (iter > maxprobe) \
break; \
} while (index != orig); \
\
return NULL; \
} \
\
void *HTNAME##_get(htable_t *h, void *key) \
{ \
void **bp = HTNAME##_peek_bp(h, key); \
if (bp == NULL) \
return HT_NOTFOUND; \
return *bp; \
} \
\
int HTNAME##_has(htable_t *h, void *key) \
{ \
return (HTNAME##_get(h,key) != HT_NOTFOUND); \
} \
\
void HTNAME##_remove(htable_t *h, void *key) \
{ \
void **bp = HTNAME##_peek_bp(h, key); \
if (bp != NULL) \
*bp = HT_NOTFOUND; \
} \
\
void HTNAME##_adjoin(htable_t *h, void *key, void *val) \
{ \
void **bp = HTNAME##_lookup_bp(h, key); \
if (*bp == HT_NOTFOUND) \
*bp = val; \
}