hash.h

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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
 */
 
#ifndef ISL_HASH_H
#define ISL_HASH_H
 
#include <stdlib.h>
#include <isl/stdint.h>
#include <isl/ctx.h>
 
#if defined(__cplusplus)
extern "C" {
#endif
 
#define isl_hash_init()   (2166136261u)
#define isl_hash_byte(h,b)  do {          \
          h *= 16777619;      \
          h ^= b;       \
        } while(0)
#define isl_hash_hash(h,h2)           \
  do {                \
    isl_hash_byte(h, (h2) & 0xFF);        \
    isl_hash_byte(h, ((h2) >> 8) & 0xFF);     \
    isl_hash_byte(h, ((h2) >> 16) & 0xFF);      \
    isl_hash_byte(h, ((h2) >> 24) & 0xFF);      \
  } while(0)
#define isl_hash_bits(h,bits)           \
  ((bits) == 32) ? (h) :            \
  ((bits) >= 16) ?            \
        ((h) >> (bits)) ^ ((h) & (((uint32_t)1 << (bits)) - 1)) : \
        (((h) >> (bits)) ^ (h)) & (((uint32_t)1 << (bits)) - 1)
 
uint32_t isl_hash_string(uint32_t hash, const char *s);
uint32_t isl_hash_mem(uint32_t hash, const void *p, size_t len);
 
#define isl_hash_builtin(h,l) isl_hash_mem(h, &l, sizeof(l))
 
struct isl_hash_table_entry
{
  uint32_t  hash;
  void     *data;
};
 
struct isl_hash_table {
  int    bits;
  int    n;
  struct isl_hash_table_entry *entries;
};
 
struct isl_hash_table *isl_hash_table_alloc(struct isl_ctx *ctx, int min_size);
void isl_hash_table_free(struct isl_ctx *ctx, struct isl_hash_table *table);
 
int isl_hash_table_init(struct isl_ctx *ctx, struct isl_hash_table *table,
      int min_size);
void isl_hash_table_clear(struct isl_hash_table *table);
extern struct isl_hash_table_entry *isl_hash_table_entry_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);
isl_stat isl_hash_table_foreach(isl_ctx *ctx, struct isl_hash_table *table,
  isl_stat (*fn)(void **entry, void *user), void *user);
isl_bool isl_hash_table_every(isl_ctx *ctx, struct isl_hash_table *table,
  isl_bool (*test)(void **entry, void *user), void *user);
void isl_hash_table_remove(struct isl_ctx *ctx,
        struct isl_hash_table *table,
        struct isl_hash_table_entry *entry);
 
#if defined(__cplusplus)
}
#endif
 
#endif