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      1 /*
      2  * Copyright 2008-2009 Katholieke Universiteit Leuven
      3  *
      4  * Use of this software is governed by the MIT license
      5  *
      6  * Written by Sven Verdoolaege, K.U.Leuven, Departement
      7  * Computerwetenschappen, Celestijnenlaan 200A, B-3001 Leuven, Belgium
      8  */
      9 
     10 #ifndef ISL_HASH_H
     11 #define ISL_HASH_H
     12 
     13 #include <stdlib.h>
     14 #include <isl/stdint.h>
     15 #include <isl/ctx.h>
     16 
     17 #if defined(__cplusplus)
     18 extern "C" {
     19 #endif
     20 
     21 #define isl_hash_init()		(2166136261u)
     22 #define isl_hash_byte(h,b)	do {					\
     23 					h *= 16777619;			\
     24 					h ^= b;				\
     25 				} while(0)
     26 #define isl_hash_hash(h,h2)						\
     27 	do {								\
     28 		isl_hash_byte(h, (h2) & 0xFF);				\
     29 		isl_hash_byte(h, ((h2) >> 8) & 0xFF);			\
     30 		isl_hash_byte(h, ((h2) >> 16) & 0xFF);			\
     31 		isl_hash_byte(h, ((h2) >> 24) & 0xFF);			\
     32 	} while(0)
     33 #define isl_hash_bits(h,bits)						\
     34 	((bits) == 32) ? (h) :						\
     35 	((bits) >= 16) ?						\
     36 	      ((h) >> (bits)) ^ ((h) & (((uint32_t)1 << (bits)) - 1)) :	\
     37 	      (((h) >> (bits)) ^ (h)) & (((uint32_t)1 << (bits)) - 1)
     38 
     39 uint32_t isl_hash_string(uint32_t hash, const char *s);
     40 uint32_t isl_hash_mem(uint32_t hash, const void *p, size_t len);
     41 
     42 #define isl_hash_builtin(h,l)	isl_hash_mem(h, &l, sizeof(l))
     43 
     44 struct isl_hash_table_entry
     45 {
     46 	uint32_t  hash;
     47 	void     *data;
     48 };
     49 
     50 struct isl_hash_table {
     51 	int    bits;
     52 	int    n;
     53 	struct isl_hash_table_entry *entries;
     54 };
     55 
     56 struct isl_hash_table *isl_hash_table_alloc(struct isl_ctx *ctx, int min_size);
     57 void isl_hash_table_free(struct isl_ctx *ctx, struct isl_hash_table *table);
     58 
     59 int isl_hash_table_init(struct isl_ctx *ctx, struct isl_hash_table *table,
     60 			int min_size);
     61 void isl_hash_table_clear(struct isl_hash_table *table);
     62 extern struct isl_hash_table_entry *isl_hash_table_entry_none;
     63 struct isl_hash_table_entry *isl_hash_table_find(struct isl_ctx *ctx,
     64 			    struct isl_hash_table *table,
     65 			    uint32_t key_hash,
     66 			    isl_bool (*eq)(const void *entry, const void *val),
     67 			    const void *val, int reserve);
     68 isl_stat isl_hash_table_foreach(isl_ctx *ctx, struct isl_hash_table *table,
     69 	isl_stat (*fn)(void **entry, void *user), void *user);
     70 isl_bool isl_hash_table_every(isl_ctx *ctx, struct isl_hash_table *table,
     71 	isl_bool (*test)(void **entry, void *user), void *user);
     72 void isl_hash_table_remove(struct isl_ctx *ctx,
     73 				struct isl_hash_table *table,
     74 				struct isl_hash_table_entry *entry);
     75 
     76 #if defined(__cplusplus)
     77 }
     78 #endif
     79 
     80 #endif
     81