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/*-----------------------------------------------------------------------------
*
* (c) The GHC Team, 1999
*
* Prototypes for Hash.c
*
* -------------------------------------------------------------------------- */
#pragma once
#include "BeginPrivate.h"
typedef struct hashtable HashTable; /* abstract */
typedef struct strhashtable StrHashTable;
/* Hash table access where the keys are StgWords.
* Values are passed into the hash table and stored as `const void *` values,
* but when the value is looked up or removed, the value is returned without the
* `const` so that calling function can mutate what the pointer points to if it
* needs to.
*/
HashTable * allocHashTable ( void );
void insertHashTable ( HashTable *table, StgWord key, const void *data );
void * lookupHashTable ( const HashTable *table, StgWord key );
void * removeHashTable ( HashTable *table, StgWord key, const void *data );
int keyCountHashTable (HashTable *table);
// Puts up to szKeys keys of the hash table into the given array. Returns the
// actual amount of keys that have been retrieved.
//
// If the table is modified concurrently, the function behavior is undefined.
//
int keysHashTable(HashTable *table, StgWord keys[], int szKeys);
typedef void (*MapHashFn)(void *data, StgWord key, const void *value);
typedef void (*MapHashFnKeys)(void *data, StgWord *key, const void *value);
// Return true -> continue; false -> stop
typedef bool (*IterHashFn)(void *data, StgWord key, const void *value);
void mapHashTable(HashTable *table, void *data, MapHashFn fn);
void mapHashTableKeys(HashTable *table, void *data, MapHashFnKeys fn);
void iterHashTable(HashTable *table, void *data, IterHashFn);
/* Hash table access where the keys are C strings (the strings are
* assumed to be allocated by the caller, and mustn't be deallocated
* until the corresponding hash table entry has been removed).
*/
INLINE_HEADER StrHashTable * allocStrHashTable ( void )
{
return (StrHashTable*) allocHashTable();
}
void insertStrHashTable ( StrHashTable *table, const char * key,
const void *data );
void * lookupStrHashTable ( const StrHashTable *table, const char * key);
void * removeStrHashTable ( StrHashTable *table, const char * key,
const void *data );
/*
* Hash tables for arbitrary key types.
* Generally, these functions allow for the specification of the
* HashFunction and CompareFunction. It's recommended that those
* are inlinable so there's a chance the compiler can discard
* some parameter-passing, as well as function calls, though note
* it's not guaranteed. Either way, the functions are parameters
* as the types should be statically known and thus
* storing them is unnecessary.
*/
typedef int HashFunction(const HashTable *table, StgWord key);
typedef int CompareFunction(StgWord key1, StgWord key2);
int hashWord(const HashTable *table, StgWord key);
int hashStr(const HashTable *table, StgWord w);
void insertHashTable_ ( HashTable *table, StgWord key,
const void *data, HashFunction f );
void * lookupHashTable_ ( const HashTable *table, StgWord key,
HashFunction f, CompareFunction cmp );
void * removeHashTable_ ( HashTable *table, StgWord key,
const void *data, HashFunction f,
CompareFunction cmp );
/* Freeing hash tables
*/
void freeHashTable ( HashTable *table, void (*freeDataFun)(void *) );
INLINE_HEADER void freeStrHashTable ( StrHashTable *table, void (*freeDataFun)(void *) )
{
freeHashTable((HashTable*)table, freeDataFun);
}
/*
* Hash set API
*
* A hash set is basically a hash table where values are NULL.
*/
typedef struct hashtable HashSet;
INLINE_HEADER HashSet *allocHashSet ( void )
{
return (HashSet*)allocHashTable();
}
INLINE_HEADER void freeHashSet ( HashSet *set )
{
freeHashTable((HashTable*)set, NULL);
}
INLINE_HEADER void insertHashSet ( HashSet *set, StgWord key )
{
insertHashTable((HashTable*)set, key, NULL);
}
#include "EndPrivate.h"
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