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#include <stdlib.h>
#include <assert.h>
#ifdef inline
/* make sure inline and static are empty so all calls become linkable functions */
#undef inline
#define inline
#ifdef static
#undef static
#endif
#define static
#include "ht_inlines.h"
#undef static
#endif
#ifndef HT_INVALID_VALUE
#define HT_INVALID_VALUE 0
#endif
#define HT_MINSIZE 8
#define HT_MAXSIZE (1U << 31)
#define JUMP(i, j) i += j++
#define JUMP_FIRST(i, j) j = 1, i += j++
/* generic functions, useful if ht_entry_t changes */
static inline void setused(HT(entry_t) *entry) {
entry->flag = 1;
}
static inline void setdeleted(HT(entry_t) *entry) {
entry->flag = -1;
}
static inline unsigned int entryhash(const HT(entry_t) *entry) {
return entry->hash;
}
void HT(init)(HT(t) *ht, unsigned int (*keyhash)(HT(const_key_t)), int (*keyeq)(HT(const_key_t), HT(const_key_t))) {
ht->mask = HT_MINSIZE - 1;
ht->fill = 0;
ht->used = 0;
ht->table = genht_calloc(ht, ht->mask + 1, sizeof(HT(entry_t)));
assert(ht->table);
ht->keyhash = keyhash;
ht->keyeq = keyeq;
}
void HT(uninit)(HT(t) *ht) {
genht_free(ht, ht->table);
ht->table = NULL;
}
HT(t) *HT(alloc)(unsigned int (*keyhash)(HT(const_key_t)), int (*keyeq)(HT(const_key_t), HT(const_key_t))) {
HT(t) *ht = genht_malloc(NULL, sizeof(HT(t)));
assert(ht);
HT(init)(ht, keyhash, keyeq);
return ht;
}
void HT(clear)(HT(t) *ht) {
HT(uninit)(ht);
HT(init)(ht, ht->keyhash, ht->keyeq);
}
void HT(free)(HT(t) *ht) {
HT(uninit)(ht);
genht_free(NULL, ht);
}
/* one lookup function to rule them all */
static HT(entry_t) *lookup(HT(t) *ht, HT(const_key_t) key, unsigned int hash) {
unsigned int mask = ht->mask;
unsigned int i = hash;
unsigned int j;
HT(entry_t) *table = ht->table;
HT(entry_t) *entry = table + (i & mask);
HT(entry_t) *free_entry; /* first deleted entry for insert */
if (HT(isempty)(entry))
return entry;
else if (HT(isdeleted)(entry))
free_entry = entry;
else if (entryhash(entry) == hash && ht->keyeq(entry->key, key))
return entry;
else
free_entry = NULL;
for (JUMP_FIRST(i, j); ; JUMP(i, j)) {
entry = table + (i & mask);
if (HT(isempty)(entry))
return (free_entry == NULL) ? entry : free_entry;
else if (HT(isdeleted)(entry)) {
if (free_entry == NULL)
free_entry = entry;
} else if (entryhash(entry) == hash && ht->keyeq(entry->key, key))
return entry;
}
}
/* for copy and resize: no deleted entries in ht, the lookedup key is not in ht */
static HT(entry_t) *cleanlookup(HT(t) *ht, unsigned int hash) {
unsigned int mask = ht->mask;
unsigned int i = hash;
unsigned int j;
HT(entry_t) *table = ht->table;
HT(entry_t) *entry = table + (i & mask);
if (HT(isempty)(entry))
return entry;
for (JUMP_FIRST(i, j); ; JUMP(i, j)) {
entry = table + (i & mask);
if (HT(isempty)(entry))
return entry;
}
}
HT(t) *HT(copy)(const HT(t) *ht) {
HT(t) *newht;
HT(entry_t) *entry;
unsigned int used = ht->used;
newht = genht_malloc(NULL, sizeof(HT(t)));
assert(newht);
*newht = *ht;
newht->fill = used;
newht->table = genht_calloc(ht, newht->mask + 1, sizeof(HT(entry_t)));
assert(newht->table);
for (entry = ht->table; used > 0; entry++)
if (HT(isused)(entry)) {
used--;
*cleanlookup(newht, entryhash(entry)) = *entry;
}
return newht;
}
void HT(resize)(HT(t) *ht, unsigned int hint) {
unsigned int newsize;
unsigned int used = ht->used;
HT(entry_t) *oldtable = ht->table;
HT(entry_t) *entry;
if (hint < used << 1)
hint = used << 1;
if (hint > HT_MAXSIZE)
hint = HT_MAXSIZE;
for (newsize = HT_MINSIZE; newsize < hint; newsize <<= 1);
ht->table = genht_calloc(ht, newsize, sizeof(HT(entry_t)));
assert(ht->table);
ht->mask = newsize - 1;
ht->fill = ht->used;
for (entry = oldtable; used > 0; entry++)
if (HT(isused)(entry)) {
used--;
*cleanlookup(ht, entryhash(entry)) = *entry;
}
genht_free(ht, oldtable);
}
int HT(has)(HT(t) *ht, HT(const_key_t) key) {
HT(entry_t) *entry = lookup(ht, key, ht->keyhash(key));
return HT(isused)(entry);
}
HT(value_t) HT(get)(HT(t) *ht, HT(const_key_t) key) {
HT(entry_t) *entry = lookup(ht, key, ht->keyhash(key));
return HT(isused)(entry) ? entry->value : HT_INVALID_VALUE;
}
HT(entry_t) *HT(getentry)(HT(t) *ht, HT(const_key_t) key) {
HT(entry_t) *entry = lookup(ht, key, ht->keyhash(key));
return HT(isused)(entry) ? entry : NULL;
}
/* fill threshold = 3/4 */
static inline void checkfill(HT(t) *ht) {
if (ht->fill > ht->mask - (ht->mask >> 2) || ht->fill > ht->used << 2)
HT(resize)(ht, ht->used << (ht->used > 1 << 16 ? 1 : 2));
}
HT(entry_t) *HT(insert)(HT(t) *ht, HT(key_t) key, HT(value_t) value) {
unsigned int hash = ht->keyhash(key);
HT(entry_t) *entry = lookup(ht, key, hash);
if (HT(isused)(entry))
return entry;
if (HT(isempty)(entry))
ht->fill++;
ht->used++;
entry->hash = hash;
entry->key = key;
entry->value = value;
setused(entry);
checkfill(ht);
return NULL;
}
void HT(set)(HT(t) *ht, HT(key_t) key, HT(value_t) value) {
HT(entry_t) *entry = HT(insert)(ht, key, value);
if (entry)
entry->value = value;
}
HT(value_t) HT(pop)(HT(t) *ht, HT(const_key_t) key) {
HT(entry_t) *entry = lookup(ht, key, ht->keyhash(key));
HT(value_t) v;
if (!HT(isused)(entry))
return HT_INVALID_VALUE;
ht->used--;
v = entry->value;
setdeleted(entry);
return v;
}
HT(entry_t) *HT(popentry)(HT(t) *ht, HT(const_key_t) key) {
HT(entry_t) *entry = lookup(ht, key, ht->keyhash(key));
if (HT(isused)(entry)) {
ht->used--;
setdeleted(entry);
return entry;
}
return NULL;
}
void HT(delentry)(HT(t) *ht, HT(entry_t) *entry) {
if (!HT(isused)(entry))
return;
ht->used--;
setdeleted(entry);
}
#undef HT_INVALID_VALUE
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