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/*
* Copyright 2008-2009 Katholieke Universiteit Leuven
*
* Use of this software is governed by the MIT license
*
* Written by Sven Verdoolaege, K.U.Leuven, Departement
* Computerwetenschappen, Celestijnenlaan 200A, B-3001 Leuven, Belgium
*/
#include <stdlib.h>
#include <isl/hash.h>
#include <isl/ctx.h>
#include "isl_config.h"
uint32_t isl_hash_string(uint32_t hash, const char *s)
{
for (; *s; s++)
isl_hash_byte(hash, *s);
return hash;
}
uint32_t isl_hash_mem(uint32_t hash, const void *p, size_t len)
{
int i;
const char *s = p;
for (i = 0; i < len; ++i)
isl_hash_byte(hash, s[i]);
return hash;
}
static unsigned int round_up(unsigned int v)
{
int old_v = v;
while (v) {
old_v = v;
v ^= v & -v;
}
return old_v << 1;
}
int isl_hash_table_init(struct isl_ctx *ctx, struct isl_hash_table *table,
int min_size)
{
size_t size;
if (!table)
return -1;
if (min_size < 2)
min_size = 2;
table->bits = ffs(round_up(4 * (min_size + 1) / 3 - 1)) - 1;
table->n = 0;
size = 1 << table->bits;
table->entries = isl_calloc_array(ctx, struct isl_hash_table_entry,
size);
if (!table->entries)
return -1;
return 0;
}
/* Dummy comparison function that always returns false.
*/
static isl_bool no(const void *entry, const void *val)
{
return isl_bool_false;
}
/* Extend "table" to twice its size.
* Return 0 on success and -1 on error.
*
* We reuse isl_hash_table_find to create entries in the extended table.
* Since all entries in the original table are assumed to be different,
* there is no need to compare them against each other.
*/
static int grow_table(struct isl_ctx *ctx, struct isl_hash_table *table)
{
int n;
size_t old_size, size;
struct isl_hash_table_entry *entries;
uint32_t h;
entries = table->entries;
old_size = 1 << table->bits;
size = 2 * old_size;
table->entries = isl_calloc_array(ctx, struct isl_hash_table_entry,
size);
if (!table->entries) {
table->entries = entries;
return -1;
}
n = table->n;
table->n = 0;
table->bits++;
for (h = 0; h < old_size; ++h) {
struct isl_hash_table_entry *entry;
if (!entries[h].data)
continue;
entry = isl_hash_table_find(ctx, table, entries[h].hash,
&no, NULL, 1);
if (!entry) {
table->bits--;
free(table->entries);
table->entries = entries;
table->n = n;
return -1;
}
*entry = entries[h];
}
free(entries);
return 0;
}
struct isl_hash_table *isl_hash_table_alloc(struct isl_ctx *ctx, int min_size)
{
struct isl_hash_table *table = NULL;
table = isl_alloc_type(ctx, struct isl_hash_table);
if (isl_hash_table_init(ctx, table, min_size))
goto error;
return table;
error:
isl_hash_table_free(ctx, table);
return NULL;
}
void isl_hash_table_clear(struct isl_hash_table *table)
{
if (!table)
return;
free(table->entries);
}
void isl_hash_table_free(struct isl_ctx *ctx, struct isl_hash_table *table)
{
if (!table)
return;
isl_hash_table_clear(table);
free(table);
}
/* A dummy entry that is used by isl_hash_table_find
* to make a distinction between a missing entry and an error condition.
*/
static struct isl_hash_table_entry none = { 0, NULL };
struct isl_hash_table_entry *isl_hash_table_entry_none = &none;
struct isl_hash_table_entry *isl_hash_table_find(struct isl_ctx *ctx,
struct isl_hash_table *table,
uint32_t key_hash,
isl_bool (*eq)(const void *entry, const void *val),
const void *val, int reserve)
{
size_t size;
uint32_t h, key_bits;
key_bits = isl_hash_bits(key_hash, table->bits);
size = 1 << table->bits;
for (h = key_bits; table->entries[h].data; h = (h+1) % size) {
isl_bool equal;
if (table->entries[h].hash != key_hash)
continue;
equal = eq(table->entries[h].data, val);
if (equal < 0)
return NULL;
if (equal)
return &table->entries[h];
}
if (!reserve)
return isl_hash_table_entry_none;
if (4 * table->n >= 3 * size) {
if (grow_table(ctx, table) < 0)
return NULL;
return isl_hash_table_find(ctx, table, key_hash, eq, val, 1);
}
table->n++;
table->entries[h].hash = key_hash;
return &table->entries[h];
}
isl_stat isl_hash_table_foreach(isl_ctx *ctx, struct isl_hash_table *table,
isl_stat (*fn)(void **entry, void *user), void *user)
{
size_t size;
uint32_t h;
if (!table->entries)
return isl_stat_error;
size = 1 << table->bits;
for (h = 0; h < size; ++ h)
if (table->entries[h].data &&
fn(&table->entries[h].data, user) < 0)
return isl_stat_error;
return isl_stat_ok;
}
void isl_hash_table_remove(struct isl_ctx *ctx,
struct isl_hash_table *table,
struct isl_hash_table_entry *entry)
{
int h, h2;
size_t size;
if (!table || !entry)
return;
size = 1 << table->bits;
h = entry - table->entries;
isl_assert(ctx, h >= 0 && h < size, return);
for (h2 = h+1; table->entries[h2 % size].data; h2++) {
uint32_t bits = isl_hash_bits(table->entries[h2 % size].hash,
table->bits);
uint32_t offset = (size + bits - (h+1)) % size;
if (offset <= h2 - (h+1))
continue;
*entry = table->entries[h2 % size];
h = h2;
entry = &table->entries[h % size];
}
entry->hash = 0;
entry->data = NULL;
table->n--;
}
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