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/**CFile****************************************************************
FileName [hashFlt.h]
SystemName [ABC: Logic synthesis and verification system.]
PackageName [Hash maps.]
Synopsis [Hash maps.]
Author [Aaron P. Hurst]
Affiliation [UC Berkeley]
Date [Ver. 1.0. Started - May 16, 2006.]
Revision [$Id: vecInt.h,v 1.00 2005/06/20 00:00:00 ahurst Exp $]
***********************************************************************/
#ifndef ABC__misc__hash__hashPtr_h
#define ABC__misc__hash__hashPtr_h
////////////////////////////////////////////////////////////////////////
/// INCLUDES ///
////////////////////////////////////////////////////////////////////////
#include <stdio.h>
#include "misc/extra/extra.h"
ABC_NAMESPACE_HEADER_START
extern int Hash_DefaultHashFunc(int key, int nBins);
////////////////////////////////////////////////////////////////////////
/// PARAMETERS ///
////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
/// BASIC TYPES ///
////////////////////////////////////////////////////////////////////////
typedef struct Hash_Ptr_t_ Hash_Ptr_t;
typedef struct Hash_Ptr_Entry_t_ Hash_Ptr_Entry_t;
struct Hash_Ptr_Entry_t_
{
int key;
void * data;
struct Hash_Ptr_Entry_t_ * pNext;
};
struct Hash_Ptr_t_
{
int nSize;
int nBins;
int (* fHash)(int key, int nBins);
Hash_Ptr_Entry_t ** pArray;
};
////////////////////////////////////////////////////////////////////////
/// MACRO DEFINITIONS ///
////////////////////////////////////////////////////////////////////////
#define Hash_PtrForEachEntry( pHash, pEntry, bin ) \
for(bin=-1, pEntry=NULL; bin < pHash->nBins; (!pEntry)?(pEntry=pHash->pArray[++bin]):(pEntry=pEntry->pNext)) \
if (pEntry)
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFINITIONS ///
////////////////////////////////////////////////////////////////////////
/**Function*************************************************************
Synopsis [Allocates a hash map with the given number of bins.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
static inline Hash_Ptr_t * Hash_PtrAlloc( int nBins )
{
Hash_Ptr_t * p;
int i;
assert(nBins > 0);
p = ABC_ALLOC( Hash_Ptr_t, 1);
p->nBins = nBins;
p->fHash = Hash_DefaultHashFunc;
p->nSize = 0;
p->pArray = ABC_ALLOC( Hash_Ptr_Entry_t *, nBins );
for(i=0; i<nBins; i++)
p->pArray[i] = NULL;
return p;
}
/**Function*************************************************************
Synopsis [Returns 1 if a key already exists.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
static inline int Hash_PtrExists( Hash_Ptr_t *p, int key )
{
int bin;
Hash_Ptr_Entry_t *pEntry;
// find the bin where this key would live
bin = (*(p->fHash))(key, p->nBins);
// search for key
pEntry = p->pArray[bin];
while(pEntry) {
if (pEntry->key == key) {
return 1;
}
pEntry = pEntry->pNext;
}
return 0;
}
/**Function*************************************************************
Synopsis [Finds or creates an entry with a key and writes value.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
static inline void Hash_PtrWriteEntry( Hash_Ptr_t *p, int key, void * data )
{
int bin;
Hash_Ptr_Entry_t *pEntry, **pLast;
// find the bin where this key would live
bin = (*(p->fHash))(key, p->nBins);
// search for key
pLast = &(p->pArray[bin]);
pEntry = p->pArray[bin];
while(pEntry) {
if (pEntry->key == key) {
pEntry->data = data;
return;
}
pLast = &(pEntry->pNext);
pEntry = pEntry->pNext;
}
// this key does not currently exist
// create a new entry and add to bin
p->nSize++;
(*pLast) = pEntry = ABC_ALLOC( Hash_Ptr_Entry_t, 1 );
pEntry->pNext = NULL;
pEntry->key = key;
pEntry->data = data;
return;
}
/**Function*************************************************************
Synopsis [Finds or creates an entry with a key.]
Description [fCreate specifies whether a new entry should be created.]
SideEffects []
SeeAlso []
***********************************************************************/
static inline void * Hash_PtrEntry( Hash_Ptr_t *p, int key, int fCreate )
{
int bin;
Hash_Ptr_Entry_t *pEntry, **pLast;
// find the bin where this key would live
bin = (*(p->fHash))(key, p->nBins);
// search for key
pLast = &(p->pArray[bin]);
pEntry = p->pArray[bin];
while(pEntry) {
if (pEntry->key == key)
return pEntry->data;
pLast = &(pEntry->pNext);
pEntry = pEntry->pNext;
}
// this key does not currently exist
if (fCreate) {
// create a new entry and add to bin
p->nSize++;
(*pLast) = pEntry = ABC_ALLOC( Hash_Ptr_Entry_t, 1 );
pEntry->pNext = NULL;
pEntry->key = key;
pEntry->data = NULL;
return pEntry->data;
}
return NULL;
}
/**Function*************************************************************
Synopsis [Finds or creates an entry with a key and returns the pointer to it.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
static inline void** Hash_PtrEntryPtr( Hash_Ptr_t *p, int key )
{
int bin;
Hash_Ptr_Entry_t *pEntry, **pLast;
// find the bin where this key would live
bin = (*(p->fHash))(key, p->nBins);
// search for key
pLast = &(p->pArray[bin]);
pEntry = p->pArray[bin];
while(pEntry) {
if (pEntry->key == key)
return &(pEntry->data);
pLast = &(pEntry->pNext);
pEntry = pEntry->pNext;
}
// this key does not currently exist
// create a new entry and add to bin
p->nSize++;
(*pLast) = pEntry = ABC_ALLOC( Hash_Ptr_Entry_t, 1 );
pEntry->pNext = NULL;
pEntry->key = key;
pEntry->data = NULL;
return &(pEntry->data);
}
/**Function*************************************************************
Synopsis [Deletes an entry.]
Description [Returns data, if there was any.]
SideEffects []
SeeAlso []
***********************************************************************/
static inline void* Hash_PtrRemove( Hash_Ptr_t *p, int key )
{
int bin;
void * data;
Hash_Ptr_Entry_t *pEntry, **pLast;
// find the bin where this key would live
bin = (*(p->fHash))(key, p->nBins);
// search for key
pLast = &(p->pArray[bin]);
pEntry = p->pArray[bin];
while(pEntry) {
if (pEntry->key == key) {
p->nSize--;
data = pEntry->data;
*pLast = pEntry->pNext;
return data;
}
pLast = &(pEntry->pNext);
pEntry = pEntry->pNext;
}
// could not find key
return NULL;
}
/**Function*************************************************************
Synopsis [Frees the hash.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
static inline void Hash_PtrFree( Hash_Ptr_t *p )
{
int bin;
Hash_Ptr_Entry_t *pEntry, *pTemp;
// free bins
for(bin = 0; bin < p->nBins; bin++) {
pEntry = p->pArray[bin];
while(pEntry) {
pTemp = pEntry;
pEntry = pEntry->pNext;
ABC_FREE( pTemp );
}
}
// free hash
ABC_FREE( p->pArray );
ABC_FREE( p );
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
ABC_NAMESPACE_HEADER_END
#endif
|
