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/**CFile****************************************************************
FileName [ivyFanout.c]
SystemName [ABC: Logic synthesis and verification system.]
PackageName [And-Inverter Graph package.]
Synopsis [Representation of the fanouts.]
Author [Alan Mishchenko]
Affiliation [UC Berkeley]
Date [Ver. 1.0. Started - May 11, 2006.]
Revision [$Id: ivyFanout.c,v 1.00 2006/05/11 00:00:00 alanmi Exp $]
***********************************************************************/
#include "ivy.h"
////////////////////////////////////////////////////////////////////////
/// DECLARATIONS ///
////////////////////////////////////////////////////////////////////////
static inline int Ivy_FanoutIsArray( void * p ) { return (int )(((unsigned)p) & 01); }
static inline Vec_Ptr_t * Ivy_FanoutGetArray( void * p ) { assert( Ivy_FanoutIsArray(p) ); return (Vec_Ptr_t *)((unsigned)(p) & ~01); }
static inline Vec_Ptr_t * Ivy_FanoutSetArray( void * p ) { assert( !Ivy_FanoutIsArray(p) ); return (Vec_Ptr_t *)((unsigned)(p) ^ 01); }
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFINITIONS ///
////////////////////////////////////////////////////////////////////////
/**Function*************************************************************
Synopsis [Starts the fanout representation.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Ivy_ManStartFanout( Ivy_Man_t * p )
{
Ivy_Obj_t * pObj;
int i;
assert( p->vFanouts == NULL );
p->vFanouts = Vec_PtrStart( Ivy_ManObjIdMax(p) + 1000 );
Ivy_ManForEachObj( p, pObj, i )
{
if ( Ivy_ObjFanin0(pObj) )
Ivy_ObjAddFanout( p, Ivy_ObjFanin0(pObj), pObj );
if ( Ivy_ObjFanin1(pObj) )
Ivy_ObjAddFanout( p, Ivy_ObjFanin1(pObj), pObj );
}
}
/**Function*************************************************************
Synopsis [Stops the fanout representation.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Ivy_ManStopFanout( Ivy_Man_t * p )
{
void * pTemp;
int i;
assert( p->vFanouts != NULL );
Vec_PtrForEachEntry( p->vFanouts, pTemp, i )
if ( Ivy_FanoutIsArray(pTemp) )
Vec_PtrFree( Ivy_FanoutGetArray(pTemp) );
Vec_PtrFree( p->vFanouts );
p->vFanouts = NULL;
}
/**Function*************************************************************
Synopsis [Add the fanout.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Ivy_ObjAddFanout( Ivy_Man_t * p, Ivy_Obj_t * pObj, Ivy_Obj_t * pFanout )
{
Vec_Ptr_t * vNodes;
void ** ppSpot;
assert( p->vFanouts != NULL );
assert( !Ivy_IsComplement(pObj) );
// extend the fanout array if needed
Vec_PtrFillExtra( p->vFanouts, pObj->Id + 1, NULL );
// get the pointer to the place where fanouts are stored
ppSpot = Vec_PtrEntryP( p->vFanouts, pObj->Id );
// consider several cases
if ( *ppSpot == NULL ) // no fanout - add one fanout
*ppSpot = pFanout;
else if ( Ivy_FanoutIsArray(*ppSpot) ) // array of fanouts - add one fanout
{
vNodes = Ivy_FanoutGetArray(*ppSpot);
Vec_PtrPush( vNodes, pFanout );
}
else // only one fanout - create array and put both fanouts into the array
{
vNodes = Vec_PtrAlloc( 4 );
Vec_PtrPush( vNodes, *ppSpot );
Vec_PtrPush( vNodes, pFanout );
*ppSpot = Ivy_FanoutSetArray( vNodes );
}
}
/**Function*************************************************************
Synopsis [Removes the fanout.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Ivy_ObjDeleteFanout( Ivy_Man_t * p, Ivy_Obj_t * pObj, Ivy_Obj_t * pFanout )
{
Vec_Ptr_t * vNodes;
void ** ppSpot;
assert( p->vFanouts != NULL );
assert( !Ivy_IsComplement(pObj) );
// extend the fanout array if needed
Vec_PtrFillExtra( p->vFanouts, pObj->Id + 1, NULL );
ppSpot = Vec_PtrEntryP( p->vFanouts, pObj->Id );
if ( *ppSpot == NULL ) // no fanout - should not happen
{
assert( 0 );
}
else if ( Ivy_FanoutIsArray(*ppSpot) ) // the array of fanouts - delete the fanout
{
vNodes = Ivy_FanoutGetArray(*ppSpot);
Vec_PtrRemove( vNodes, pFanout );
}
else // only one fanout - delete the fanout
{
assert( *ppSpot == pFanout );
*ppSpot = NULL;
}
// printf( " %d", Ivy_ObjFanoutNum(p, pObj) );
}
/**Function*************************************************************
Synopsis [Replaces the fanout of pOld to be pFanoutNew.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Ivy_ObjPatchFanout( Ivy_Man_t * p, Ivy_Obj_t * pObj, Ivy_Obj_t * pFanoutOld, Ivy_Obj_t * pFanoutNew )
{
Vec_Ptr_t * vNodes;
void ** ppSpot;
int Index;
assert( p->vFanouts != NULL );
assert( !Ivy_IsComplement(pObj) );
// extend the fanout array if needed
Vec_PtrFillExtra( p->vFanouts, pObj->Id + 1, NULL );
ppSpot = Vec_PtrEntryP( p->vFanouts, pObj->Id );
if ( *ppSpot == NULL ) // no fanout - should not happen
{
assert( 0 );
}
else if ( Ivy_FanoutIsArray(*ppSpot) ) // the array of fanouts - find and replace the fanout
{
vNodes = Ivy_FanoutGetArray(*ppSpot);
Index = Vec_PtrFind( vNodes, pFanoutOld );
assert( Index >= 0 );
Vec_PtrWriteEntry( vNodes, Index, pFanoutNew );
}
else // only one fanout - delete the fanout
{
assert( *ppSpot == pFanoutOld );
*ppSpot = pFanoutNew;
}
}
/**Function*************************************************************
Synopsis [Starts iteration through the fanouts.]
Description [Copies the currently available fanouts into the array.]
SideEffects [Can be used while the fanouts are being removed.]
SeeAlso []
***********************************************************************/
void Ivy_ObjCollectFanouts( Ivy_Man_t * p, Ivy_Obj_t * pObj, Vec_Ptr_t * vArray )
{
Vec_Ptr_t * vNodes;
Ivy_Obj_t * pTemp;
int i;
assert( p->vFanouts != NULL );
assert( !Ivy_IsComplement(pObj) );
// extend the fanout array if needed
Vec_PtrFillExtra( p->vFanouts, pObj->Id + 1, NULL );
vNodes = Vec_PtrEntry( p->vFanouts, pObj->Id );
// clean the resulting array
Vec_PtrClear( vArray );
if ( vNodes == NULL ) // no fanout - nothing to do
{
}
else if ( Ivy_FanoutIsArray(vNodes) ) // the array of fanouts - copy fanouts
{
vNodes = Ivy_FanoutGetArray(vNodes);
Vec_PtrForEachEntry( vNodes, pTemp, i )
Vec_PtrPush( vArray, pTemp );
}
else // only one fanout - add the fanout
Vec_PtrPush( vArray, vNodes );
}
/**Function*************************************************************
Synopsis [Reads one fanout.]
Description [Returns fanout if there is only one fanout.]
SideEffects []
SeeAlso []
***********************************************************************/
Ivy_Obj_t * Ivy_ObjReadOneFanout( Ivy_Man_t * p, Ivy_Obj_t * pObj )
{
Vec_Ptr_t * vNodes;
assert( p->vFanouts != NULL );
assert( !Ivy_IsComplement(pObj) );
// extend the fanout array if needed
Vec_PtrFillExtra( p->vFanouts, pObj->Id + 1, NULL );
vNodes = Vec_PtrEntry( p->vFanouts, pObj->Id );
// clean the resulting array
if ( vNodes && !Ivy_FanoutIsArray(vNodes) ) // only one fanout - return
return (Ivy_Obj_t *)vNodes;
return NULL;
}
/**Function*************************************************************
Synopsis [Reads one fanout.]
Description [Returns fanout if there is only one fanout.]
SideEffects []
SeeAlso []
***********************************************************************/
Ivy_Obj_t * Ivy_ObjReadFirstFanout( Ivy_Man_t * p, Ivy_Obj_t * pObj )
{
Vec_Ptr_t * vNodes;
assert( p->vFanouts != NULL );
assert( !Ivy_IsComplement(pObj) );
// extend the fanout array if needed
Vec_PtrFillExtra( p->vFanouts, pObj->Id + 1, NULL );
vNodes = Vec_PtrEntry( p->vFanouts, pObj->Id );
// clean the resulting array
if ( vNodes == NULL )
return NULL;
if ( !Ivy_FanoutIsArray(vNodes) ) // only one fanout - return
return (Ivy_Obj_t *)vNodes;
return Vec_PtrEntry( Ivy_FanoutGetArray(vNodes), 0 );
}
/**Function*************************************************************
Synopsis [Reads one fanout.]
Description [Returns fanout if there is only one fanout.]
SideEffects []
SeeAlso []
***********************************************************************/
int Ivy_ObjFanoutNum( Ivy_Man_t * p, Ivy_Obj_t * pObj )
{
Vec_Ptr_t * vNodes;
assert( p->vFanouts != NULL );
assert( !Ivy_IsComplement(pObj) );
// extend the fanout array if needed
Vec_PtrFillExtra( p->vFanouts, pObj->Id + 1, NULL );
vNodes = Vec_PtrEntry( p->vFanouts, pObj->Id );
// clean the resulting array
if ( vNodes == NULL )
return 0;
if ( !Ivy_FanoutIsArray(vNodes) ) // only one fanout - return
return 1;
return Vec_PtrSize( Ivy_FanoutGetArray(vNodes) );
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
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