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119 lines
4.1 KiB
C
119 lines
4.1 KiB
C
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* vim: set ts=8 sts=4 et sw=4 tw=99:
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef jshash_h___
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#define jshash_h___
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/*
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* API to portable hash table code.
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*/
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#include <stddef.h>
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#include <stdio.h>
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#include "jstypes.h"
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extern "C" {
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typedef uint32_t JSHashNumber;
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typedef struct JSHashEntry JSHashEntry;
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typedef struct JSHashTable JSHashTable;
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#define JS_HASH_BITS 32
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#define JS_GOLDEN_RATIO 0x9E3779B9U
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typedef JSHashNumber (* JSHashFunction)(const void *key);
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typedef int (* JSHashComparator)(const void *v1, const void *v2);
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typedef int (* JSHashEnumerator)(JSHashEntry *he, int i, void *arg);
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/* Flag bits in JSHashEnumerator's return value */
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#define HT_ENUMERATE_NEXT 0 /* continue enumerating entries */
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#define HT_ENUMERATE_STOP 1 /* stop enumerating entries */
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#define HT_ENUMERATE_REMOVE 2 /* remove and free the current entry */
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typedef struct JSHashAllocOps {
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void * (*allocTable)(void *pool, size_t size);
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void (*freeTable)(void *pool, void *item, size_t size);
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JSHashEntry * (*allocEntry)(void *pool, const void *key);
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void (*freeEntry)(void *pool, JSHashEntry *he, unsigned flag);
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} JSHashAllocOps;
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#define HT_FREE_VALUE 0 /* just free the entry's value */
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#define HT_FREE_ENTRY 1 /* free value and entire entry */
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struct JSHashEntry {
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JSHashEntry *next; /* hash chain linkage */
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JSHashNumber keyHash; /* key hash function result */
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const void *key; /* ptr to opaque key */
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void *value; /* ptr to opaque value */
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};
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struct JSHashTable {
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JSHashEntry **buckets; /* vector of hash buckets */
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uint32_t nentries; /* number of entries in table */
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uint32_t shift; /* multiplicative hash shift */
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JSHashFunction keyHash; /* key hash function */
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JSHashComparator keyCompare; /* key comparison function */
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JSHashComparator valueCompare; /* value comparison function */
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JSHashAllocOps *allocOps; /* allocation operations */
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void *allocPriv; /* allocation private data */
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#ifdef JS_HASHMETER
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uint32_t nlookups; /* total number of lookups */
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uint32_t nsteps; /* number of hash chains traversed */
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uint32_t ngrows; /* number of table expansions */
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uint32_t nshrinks; /* number of table contractions */
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#endif
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};
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/*
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* Create a new hash table.
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* If allocOps is null, use default allocator ops built on top of malloc().
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*/
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extern JSHashTable *
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JS_NewHashTable(uint32_t n, JSHashFunction keyHash,
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JSHashComparator keyCompare, JSHashComparator valueCompare,
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JSHashAllocOps *allocOps, void *allocPriv);
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extern void
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JS_HashTableDestroy(JSHashTable *ht);
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/* Low level access methods */
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extern JSHashEntry **
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JS_HashTableRawLookup(JSHashTable *ht, JSHashNumber keyHash, const void *key);
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extern JSHashEntry *
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JS_HashTableRawAdd(JSHashTable *ht, JSHashEntry **&hep, JSHashNumber keyHash,
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const void *key, void *value);
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extern void
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JS_HashTableRawRemove(JSHashTable *ht, JSHashEntry **hep, JSHashEntry *he);
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/* Higher level access methods */
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extern JSHashEntry *
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JS_HashTableAdd(JSHashTable *ht, const void *key, void *value);
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extern bool
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JS_HashTableRemove(JSHashTable *ht, const void *key);
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extern int
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JS_HashTableEnumerateEntries(JSHashTable *ht, JSHashEnumerator f, void *arg);
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extern void *
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JS_HashTableLookup(JSHashTable *ht, const void *key);
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extern int
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JS_HashTableDump(JSHashTable *ht, JSHashEnumerator dump, FILE *fp);
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/* General-purpose C string hash function. */
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extern JSHashNumber
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JS_HashString(const void *key);
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/* Stub function just returns v1 == v2 */
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extern int
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JS_CompareValues(const void *v1, const void *v2);
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} // extern "C"
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#endif /* jshash_h___ */
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