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/**CFile****************************************************************
FileName [nmTable.c]
SystemName [ABC: Logic synthesis and verification system.]
PackageName [Name manager.]
Synopsis [Hash table for the name manager.]
Author [Alan Mishchenko]
Affiliation [UC Berkeley]
Date [Ver. 1.0. Started - June 20, 2005.]
Revision [$Id: nmTable.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $]
***********************************************************************/
#include "nmInt.h"
ABC_NAMESPACE_IMPL_START
////////////////////////////////////////////////////////////////////////
/// DECLARATIONS ///
////////////////////////////////////////////////////////////////////////
// hashing for integers
static unsigned Nm_HashNumber( int Num, int TableSize )
{
unsigned Key = 0;
Key ^= ( Num & 0xFF) * 7937;
Key ^= ((Num >> 8) & 0xFF) * 2971;
Key ^= ((Num >> 16) & 0xFF) * 911;
Key ^= ((Num >> 24) & 0xFF) * 353;
return Key % TableSize;
}
// hashing for strings
static unsigned Nm_HashString( char * pName, int TableSize )
{
static int s_Primes[10] = {
1291, 1699, 2357, 4177, 5147,
5647, 6343, 7103, 7873, 8147
};
unsigned i, Key = 0;
for ( i = 0; pName[i] != '\0'; i++ )
Key ^= s_Primes[i%10]*pName[i]*pName[i];
return Key % TableSize;
}
static void Nm_ManResize( Nm_Man_t * p );
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFINITIONS ///
////////////////////////////////////////////////////////////////////////
/**Function*************************************************************
Synopsis [Adds an entry to two hash tables.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Nm_ManTableAdd( Nm_Man_t * p, Nm_Entry_t * pEntry )
{
Nm_Entry_t ** ppSpot, * pOther;
// resize the tables if needed
if ( p->nEntries > p->nBins * p->nSizeFactor )
Nm_ManResize( p );
// add the entry to the table Id->Name
assert( Nm_ManTableLookupId(p, pEntry->ObjId) == NULL );
ppSpot = p->pBinsI2N + Nm_HashNumber(pEntry->ObjId, p->nBins);
pEntry->pNextI2N = *ppSpot;
*ppSpot = pEntry;
// check if an entry with the same name already exists
if ( (pOther = Nm_ManTableLookupName(p, pEntry->Name, -1)) )
{
// entry with the same name already exists - add it to the ring
pEntry->pNameSake = pOther->pNameSake? pOther->pNameSake : pOther;
pOther->pNameSake = pEntry;
}
else
{
// entry with the same name does not exist - add it to the table
ppSpot = p->pBinsN2I + Nm_HashString(pEntry->Name, p->nBins);
pEntry->pNextN2I = *ppSpot;
*ppSpot = pEntry;
}
// report successfully added entry
p->nEntries++;
return 1;
}
/**Function*************************************************************
Synopsis [Deletes the entry from two hash tables.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Nm_ManTableDelete( Nm_Man_t * p, int ObjId )
{
Nm_Entry_t ** ppSpot, * pEntry, * pPrev;
int fRemoved;
p->nEntries--;
// remove the entry from the table Id->Name
assert( Nm_ManTableLookupId(p, ObjId) != NULL );
ppSpot = p->pBinsI2N + Nm_HashNumber(ObjId, p->nBins);
while ( (*ppSpot)->ObjId != (unsigned)ObjId )
ppSpot = &(*ppSpot)->pNextI2N;
pEntry = *ppSpot;
*ppSpot = (*ppSpot)->pNextI2N;
// remove the entry from the table Name->Id
ppSpot = p->pBinsN2I + Nm_HashString(pEntry->Name, p->nBins);
while ( *ppSpot && *ppSpot != pEntry )
ppSpot = &(*ppSpot)->pNextN2I;
// remember if we found this one in the list
fRemoved = (*ppSpot != NULL);
if ( *ppSpot )
{
assert( *ppSpot == pEntry );
*ppSpot = (*ppSpot)->pNextN2I;
}
// quit if this entry has no namesakes
if ( pEntry->pNameSake == NULL )
{
assert( fRemoved );
return 1;
}
// remove entry from the ring of namesakes
assert( pEntry->pNameSake != pEntry );
for ( pPrev = pEntry; pPrev->pNameSake != pEntry; pPrev = pPrev->pNameSake );
assert( !strcmp(pPrev->Name, pEntry->Name) );
assert( pPrev->pNameSake == pEntry );
if ( pEntry->pNameSake == pPrev ) // two entries in the ring
pPrev->pNameSake = NULL;
else
pPrev->pNameSake = pEntry->pNameSake;
// reinsert the ring back if we removed its connection with the list in the table
if ( fRemoved )
{
assert( pPrev->pNextN2I == NULL );
pPrev->pNextN2I = *ppSpot;
*ppSpot = pPrev;
}
return 1;
}
/**Function*************************************************************
Synopsis [Looks up the entry by ID.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Nm_Entry_t * Nm_ManTableLookupId( Nm_Man_t * p, int ObjId )
{
Nm_Entry_t * pEntry;
for ( pEntry = p->pBinsI2N[ Nm_HashNumber(ObjId, p->nBins) ]; pEntry; pEntry = pEntry->pNextI2N )
if ( pEntry->ObjId == (unsigned)ObjId )
return pEntry;
return NULL;
}
/**Function*************************************************************
Synopsis [Looks up the entry by name and type.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Nm_Entry_t * Nm_ManTableLookupName( Nm_Man_t * p, char * pName, int Type )
{
Nm_Entry_t * pEntry, * pTemp;
for ( pEntry = p->pBinsN2I[ Nm_HashString(pName, p->nBins) ]; pEntry; pEntry = pEntry->pNextN2I )
{
// check the entry itself
if ( !strcmp(pEntry->Name, pName) && (Type == -1 || pEntry->Type == (unsigned)Type) )
return pEntry;
// if there is no namesakes, continue
if ( pEntry->pNameSake == NULL )
continue;
// check the list of namesakes
for ( pTemp = pEntry->pNameSake; pTemp != pEntry; pTemp = pTemp->pNameSake )
if ( !strcmp(pTemp->Name, pName) && (Type == -1 || pTemp->Type == (unsigned)Type) )
return pTemp;
}
return NULL;
}
/**Function*************************************************************
Synopsis [Profiles hash tables.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Nm_ManProfile( Nm_Man_t * p )
{
Nm_Entry_t * pEntry;
int Counter, e;
printf( "I2N table: " );
for ( e = 0; e < p->nBins; e++ )
{
Counter = 0;
for ( pEntry = p->pBinsI2N[e]; pEntry; pEntry = pEntry->pNextI2N )
Counter++;
printf( "%d ", Counter );
}
printf( "\n" );
printf( "N2I table: " );
for ( e = 0; e < p->nBins; e++ )
{
Counter = 0;
for ( pEntry = p->pBinsN2I[e]; pEntry; pEntry = pEntry->pNextN2I )
Counter++;
printf( "%d ", Counter );
}
printf( "\n" );
}
/**Function*************************************************************
Synopsis [Resizes the table.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Nm_ManResize( Nm_Man_t * p )
{
Nm_Entry_t ** pBinsNewI2N, ** pBinsNewN2I, * pEntry, * pEntry2, ** ppSpot;
int nBinsNew, Counter, e, clk;
clk = clock();
// get the new table size
nBinsNew = Cudd_PrimeCopy( p->nGrowthFactor * p->nBins );
// allocate a new array
pBinsNewI2N = ABC_ALLOC( Nm_Entry_t *, nBinsNew );
pBinsNewN2I = ABC_ALLOC( Nm_Entry_t *, nBinsNew );
memset( pBinsNewI2N, 0, sizeof(Nm_Entry_t *) * nBinsNew );
memset( pBinsNewN2I, 0, sizeof(Nm_Entry_t *) * nBinsNew );
// rehash entries in Id->Name table
Counter = 0;
for ( e = 0; e < p->nBins; e++ )
for ( pEntry = p->pBinsI2N[e], pEntry2 = pEntry? pEntry->pNextI2N : NULL;
pEntry; pEntry = pEntry2, pEntry2 = pEntry? pEntry->pNextI2N : NULL )
{
ppSpot = pBinsNewI2N + Nm_HashNumber(pEntry->ObjId, nBinsNew);
pEntry->pNextI2N = *ppSpot;
*ppSpot = pEntry;
Counter++;
}
// rehash entries in Name->Id table
for ( e = 0; e < p->nBins; e++ )
for ( pEntry = p->pBinsN2I[e], pEntry2 = pEntry? pEntry->pNextN2I : NULL;
pEntry; pEntry = pEntry2, pEntry2 = pEntry? pEntry->pNextN2I : NULL )
{
ppSpot = pBinsNewN2I + Nm_HashString(pEntry->Name, nBinsNew);
pEntry->pNextN2I = *ppSpot;
*ppSpot = pEntry;
}
assert( Counter == p->nEntries );
// printf( "Increasing the structural table size from %6d to %6d. ", p->nBins, nBinsNew );
// ABC_PRT( "Time", clock() - clk );
// replace the table and the parameters
ABC_FREE( p->pBinsI2N );
ABC_FREE( p->pBinsN2I );
p->pBinsI2N = pBinsNewI2N;
p->pBinsN2I = pBinsNewN2I;
p->nBins = nBinsNew;
// Nm_ManProfile( p );
}
/**Function*************************************************************
Synopsis [Returns the smallest prime larger than the number.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
unsigned int Cudd_PrimeNm( unsigned int p)
{
int i,pn;
p--;
do {
p++;
if (p&1) {
pn = 1;
i = 3;
while ((unsigned) (i * i) <= p) {
if (p % i == 0) {
pn = 0;
break;
}
i += 2;
}
} else {
pn = 0;
}
} while (!pn);
return(p);
} /* end of Cudd_Prime */
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
ABC_NAMESPACE_IMPL_END
|
