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/**CFile****************************************************************
FileName [ivyObj.c]
SystemName [ABC: Logic synthesis and verification system.]
PackageName [And-Inverter Graph package.]
Synopsis [Adding/removing objects.]
Author [Alan Mishchenko]
Affiliation [UC Berkeley]
Date [Ver. 1.0. Started - May 11, 2006.]
Revision [$Id: ivyObj.c,v 1.00 2006/05/11 00:00:00 alanmi Exp $]
***********************************************************************/
#include "ivy.h"
ABC_NAMESPACE_IMPL_START
////////////////////////////////////////////////////////////////////////
/// DECLARATIONS ///
////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFINITIONS ///
////////////////////////////////////////////////////////////////////////
/**Function*************************************************************
Synopsis [Create the new node assuming it does not exist.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Ivy_Obj_t * Ivy_ObjCreatePi( Ivy_Man_t * p )
{
return Ivy_ObjCreate( p, Ivy_ObjCreateGhost(p, NULL, NULL, IVY_PI, IVY_INIT_NONE) );
}
/**Function*************************************************************
Synopsis [Create the new node assuming it does not exist.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Ivy_Obj_t * Ivy_ObjCreatePo( Ivy_Man_t * p, Ivy_Obj_t * pDriver )
{
return Ivy_ObjCreate( p, Ivy_ObjCreateGhost(p, pDriver, NULL, IVY_PO, IVY_INIT_NONE) );
}
/**Function*************************************************************
Synopsis [Create the new node assuming it does not exist.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Ivy_Obj_t * Ivy_ObjCreate( Ivy_Man_t * p, Ivy_Obj_t * pGhost )
{
Ivy_Obj_t * pObj;
assert( !Ivy_IsComplement(pGhost) );
assert( Ivy_ObjIsGhost(pGhost) );
assert( Ivy_TableLookup(p, pGhost) == NULL );
// get memory for the new object
pObj = Ivy_ManFetchMemory( p );
assert( Ivy_ObjIsNone(pObj) );
pObj->Id = Vec_PtrSize(p->vObjs);
Vec_PtrPush( p->vObjs, pObj );
// add basic info (fanins, compls, type, init)
pObj->Type = pGhost->Type;
pObj->Init = pGhost->Init;
// add connections
Ivy_ObjConnect( p, pObj, pGhost->pFanin0, pGhost->pFanin1 );
// compute level
if ( Ivy_ObjIsNode(pObj) )
pObj->Level = Ivy_ObjLevelNew(pObj);
else if ( Ivy_ObjIsLatch(pObj) )
pObj->Level = 0;
else if ( Ivy_ObjIsOneFanin(pObj) )
pObj->Level = Ivy_ObjFanin0(pObj)->Level;
else if ( !Ivy_ObjIsPi(pObj) )
assert( 0 );
// create phase
if ( Ivy_ObjIsNode(pObj) )
pObj->fPhase = Ivy_ObjFaninPhase(Ivy_ObjChild0(pObj)) & Ivy_ObjFaninPhase(Ivy_ObjChild1(pObj));
else if ( Ivy_ObjIsOneFanin(pObj) )
pObj->fPhase = Ivy_ObjFaninPhase(Ivy_ObjChild0(pObj));
// set the fail TFO flag
if ( Ivy_ObjIsNode(pObj) )
pObj->fFailTfo = Ivy_ObjFanin0(pObj)->fFailTfo | Ivy_ObjFanin1(pObj)->fFailTfo;
// mark the fanins in a special way if the node is EXOR
if ( Ivy_ObjIsExor(pObj) )
{
Ivy_ObjFanin0(pObj)->fExFan = 1;
Ivy_ObjFanin1(pObj)->fExFan = 1;
}
// add PIs/POs to the arrays
if ( Ivy_ObjIsPi(pObj) )
Vec_PtrPush( p->vPis, pObj );
else if ( Ivy_ObjIsPo(pObj) )
Vec_PtrPush( p->vPos, pObj );
// else if ( Ivy_ObjIsBuf(pObj) )
// Vec_PtrPush( p->vBufs, pObj );
if ( p->vRequired && Vec_IntSize(p->vRequired) <= pObj->Id )
Vec_IntFillExtra( p->vRequired, 2 * Vec_IntSize(p->vRequired), 1000000 );
// update node counters of the manager
p->nObjs[Ivy_ObjType(pObj)]++;
p->nCreated++;
// printf( "Adding %sAIG node: ", p->pHaig==NULL? "H":" " );
// Ivy_ObjPrintVerbose( p, pObj, p->pHaig==NULL );
// printf( "\n" );
// if HAIG is defined, create a corresponding node
if ( p->pHaig )
Ivy_ManHaigCreateObj( p, pObj );
return pObj;
}
/**Function*************************************************************
Synopsis [Connect the object to the fanin.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Ivy_ObjConnect( Ivy_Man_t * p, Ivy_Obj_t * pObj, Ivy_Obj_t * pFan0, Ivy_Obj_t * pFan1 )
{
assert( !Ivy_IsComplement(pObj) );
assert( Ivy_ObjIsPi(pObj) || Ivy_ObjIsOneFanin(pObj) || pFan1 != NULL );
// add the first fanin
pObj->pFanin0 = pFan0;
pObj->pFanin1 = pFan1;
// increment references of the fanins and add their fanouts
if ( Ivy_ObjFanin0(pObj) != NULL )
{
Ivy_ObjRefsInc( Ivy_ObjFanin0(pObj) );
if ( p->fFanout )
Ivy_ObjAddFanout( p, Ivy_ObjFanin0(pObj), pObj );
}
if ( Ivy_ObjFanin1(pObj) != NULL )
{
Ivy_ObjRefsInc( Ivy_ObjFanin1(pObj) );
if ( p->fFanout )
Ivy_ObjAddFanout( p, Ivy_ObjFanin1(pObj), pObj );
}
// add the node to the structural hash table
Ivy_TableInsert( p, pObj );
}
/**Function*************************************************************
Synopsis [Connect the object to the fanin.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Ivy_ObjDisconnect( Ivy_Man_t * p, Ivy_Obj_t * pObj )
{
assert( !Ivy_IsComplement(pObj) );
assert( Ivy_ObjIsPi(pObj) || Ivy_ObjIsOneFanin(pObj) || Ivy_ObjFanin1(pObj) != NULL );
// remove connections
if ( pObj->pFanin0 != NULL )
{
Ivy_ObjRefsDec(Ivy_ObjFanin0(pObj));
if ( p->fFanout )
Ivy_ObjDeleteFanout( p, Ivy_ObjFanin0(pObj), pObj );
}
if ( pObj->pFanin1 != NULL )
{
Ivy_ObjRefsDec(Ivy_ObjFanin1(pObj));
if ( p->fFanout )
Ivy_ObjDeleteFanout( p, Ivy_ObjFanin1(pObj), pObj );
}
assert( pObj->pNextFan0 == NULL );
assert( pObj->pNextFan1 == NULL );
assert( pObj->pPrevFan0 == NULL );
assert( pObj->pPrevFan1 == NULL );
// remove the node from the structural hash table
Ivy_TableDelete( p, pObj );
// add the first fanin
pObj->pFanin0 = NULL;
pObj->pFanin1 = NULL;
}
/**Function*************************************************************
Synopsis [Replaces the first fanin of the node by the new fanin.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Ivy_ObjPatchFanin0( Ivy_Man_t * p, Ivy_Obj_t * pObj, Ivy_Obj_t * pFaninNew )
{
Ivy_Obj_t * pFaninOld;
assert( !Ivy_IsComplement(pObj) );
pFaninOld = Ivy_ObjFanin0(pObj);
// decrement ref and remove fanout
Ivy_ObjRefsDec( pFaninOld );
if ( p->fFanout )
Ivy_ObjDeleteFanout( p, pFaninOld, pObj );
// update the fanin
pObj->pFanin0 = pFaninNew;
// increment ref and add fanout
Ivy_ObjRefsInc( Ivy_Regular(pFaninNew) );
if ( p->fFanout )
Ivy_ObjAddFanout( p, Ivy_Regular(pFaninNew), pObj );
// get rid of old fanin
if ( !Ivy_ObjIsPi(pFaninOld) && !Ivy_ObjIsConst1(pFaninOld) && Ivy_ObjRefs(pFaninOld) == 0 )
Ivy_ObjDelete_rec( p, pFaninOld, 1 );
}
/**Function*************************************************************
Synopsis [Deletes the node.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Ivy_ObjDelete( Ivy_Man_t * p, Ivy_Obj_t * pObj, int fFreeTop )
{
assert( !Ivy_IsComplement(pObj) );
assert( Ivy_ObjRefs(pObj) == 0 || !fFreeTop );
// update node counters of the manager
p->nObjs[pObj->Type]--;
p->nDeleted++;
// remove connections
Ivy_ObjDisconnect( p, pObj );
// remove PIs/POs from the arrays
if ( Ivy_ObjIsPi(pObj) )
Vec_PtrRemove( p->vPis, pObj );
else if ( Ivy_ObjIsPo(pObj) )
Vec_PtrRemove( p->vPos, pObj );
else if ( p->fFanout && Ivy_ObjIsBuf(pObj) )
Vec_PtrRemove( p->vBufs, pObj );
// clean and recycle the entry
if ( fFreeTop )
{
// free the node
Vec_PtrWriteEntry( p->vObjs, pObj->Id, NULL );
Ivy_ManRecycleMemory( p, pObj );
}
else
{
int nRefsOld = pObj->nRefs;
Ivy_Obj_t * pFanout = pObj->pFanout;
Ivy_ObjClean( pObj );
pObj->pFanout = pFanout;
pObj->nRefs = nRefsOld;
}
}
/**Function*************************************************************
Synopsis [Deletes the MFFC of the node.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Ivy_ObjDelete_rec( Ivy_Man_t * p, Ivy_Obj_t * pObj, int fFreeTop )
{
Ivy_Obj_t * pFanin0, * pFanin1;
assert( !Ivy_IsComplement(pObj) );
assert( !Ivy_ObjIsNone(pObj) );
if ( Ivy_ObjIsConst1(pObj) || Ivy_ObjIsPi(pObj) )
return;
pFanin0 = Ivy_ObjFanin0(pObj);
pFanin1 = Ivy_ObjFanin1(pObj);
Ivy_ObjDelete( p, pObj, fFreeTop );
if ( pFanin0 && !Ivy_ObjIsNone(pFanin0) && Ivy_ObjRefs(pFanin0) == 0 )
Ivy_ObjDelete_rec( p, pFanin0, 1 );
if ( pFanin1 && !Ivy_ObjIsNone(pFanin1) && Ivy_ObjRefs(pFanin1) == 0 )
Ivy_ObjDelete_rec( p, pFanin1, 1 );
}
/**Function*************************************************************
Synopsis [Replaces one object by another.]
Description [Both objects are currently in the manager. The new object
(pObjNew) should be used instead of the old object (pObjOld). If the
new object is complemented or used, the buffer is added.]
SideEffects []
SeeAlso []
***********************************************************************/
void Ivy_ObjReplace( Ivy_Man_t * p, Ivy_Obj_t * pObjOld, Ivy_Obj_t * pObjNew, int fDeleteOld, int fFreeTop, int fUpdateLevel )
{
int nRefsOld;//, clk;
// the object to be replaced cannot be complemented
assert( !Ivy_IsComplement(pObjOld) );
// the object to be replaced cannot be a terminal
assert( Ivy_ObjIsNone(pObjOld) || !Ivy_ObjIsPi(pObjOld) );
// the object to be used cannot be a PO or assert
assert( !Ivy_ObjIsBuf(Ivy_Regular(pObjNew)) );
// the object cannot be the same
assert( pObjOld != Ivy_Regular(pObjNew) );
//printf( "Replacing %d by %d.\n", Ivy_Regular(pObjOld)->Id, Ivy_Regular(pObjNew)->Id );
// if HAIG is defined, create the choice node
if ( p->pHaig )
{
// if ( pObjOld->Id == 31 )
// {
// Ivy_ManShow( p, 0 );
// Ivy_ManShow( p->pHaig, 1 );
// }
Ivy_ManHaigCreateChoice( p, pObjOld, pObjNew );
}
// if the new object is complemented or already used, add the buffer
if ( Ivy_IsComplement(pObjNew) || Ivy_ObjIsLatch(pObjNew) || Ivy_ObjRefs(pObjNew) > 0 || Ivy_ObjIsPi(pObjNew) || Ivy_ObjIsConst1(pObjNew) )
pObjNew = Ivy_ObjCreate( p, Ivy_ObjCreateGhost(p, pObjNew, NULL, IVY_BUF, IVY_INIT_NONE) );
assert( !Ivy_IsComplement(pObjNew) );
if ( fUpdateLevel )
{
//clk = clock();
// if the new node's arrival time is different, recursively update arrival time of the fanouts
if ( p->fFanout && !Ivy_ObjIsBuf(pObjNew) && pObjOld->Level != pObjNew->Level )
{
assert( Ivy_ObjIsNode(pObjOld) );
pObjOld->Level = pObjNew->Level;
Ivy_ObjUpdateLevel_rec( p, pObjOld );
}
//p->time1 += clock() - clk;
// if the new node's required time has changed, recursively update required time of the fanins
//clk = clock();
if ( p->vRequired )
{
int ReqNew = Vec_IntEntry(p->vRequired, pObjOld->Id);
if ( ReqNew < Vec_IntEntry(p->vRequired, pObjNew->Id) )
{
Vec_IntWriteEntry( p->vRequired, pObjNew->Id, ReqNew );
Ivy_ObjUpdateLevelR_rec( p, pObjNew, ReqNew );
}
}
//p->time2 += clock() - clk;
}
// delete the old object
if ( fDeleteOld )
Ivy_ObjDelete_rec( p, pObjOld, fFreeTop );
// make sure object is not pointing to itself
assert( Ivy_ObjFanin0(pObjNew) == NULL || pObjOld != Ivy_ObjFanin0(pObjNew) );
assert( Ivy_ObjFanin1(pObjNew) == NULL || pObjOld != Ivy_ObjFanin1(pObjNew) );
// make sure the old node has no fanin fanout pointers
if ( p->fFanout )
{
assert( pObjOld->pFanout != NULL );
assert( pObjNew->pFanout == NULL );
pObjNew->pFanout = pObjOld->pFanout;
}
// transfer the old object
assert( Ivy_ObjRefs(pObjNew) == 0 );
nRefsOld = pObjOld->nRefs;
Ivy_ObjOverwrite( pObjOld, pObjNew );
pObjOld->nRefs = nRefsOld;
// patch the fanout of the fanins
if ( p->fFanout )
{
Ivy_ObjPatchFanout( p, Ivy_ObjFanin0(pObjOld), pObjNew, pObjOld );
if ( Ivy_ObjFanin1(pObjOld) )
Ivy_ObjPatchFanout( p, Ivy_ObjFanin1(pObjOld), pObjNew, pObjOld );
}
// update the hash table
Ivy_TableUpdate( p, pObjNew, pObjOld->Id );
// recycle the object that was taken over by pObjOld
Vec_PtrWriteEntry( p->vObjs, pObjNew->Id, NULL );
Ivy_ManRecycleMemory( p, pObjNew );
// if the new node is the buffer propagate it
if ( p->fFanout && Ivy_ObjIsBuf(pObjOld) )
Vec_PtrPush( p->vBufs, pObjOld );
// Ivy_ManCheckFanouts( p );
// printf( "\n" );
/*
if ( p->pHaig )
{
int x;
Ivy_ManShow( p, 0, NULL );
Ivy_ManShow( p->pHaig, 1, NULL );
x = 0;
}
*/
// if ( Ivy_ManCheckFanoutNums(p) )
// {
// int x = 0;
// }
}
/**Function*************************************************************
Synopsis [Fixes buffer fanins.]
Description [This situation happens because NodeReplace is a lazy
procedure, which does not propagate the change to the fanouts but
instead records the change in the form of a buf/inv node.]
SideEffects []
SeeAlso []
***********************************************************************/
void Ivy_NodeFixBufferFanins( Ivy_Man_t * p, Ivy_Obj_t * pNode, int fUpdateLevel )
{
Ivy_Obj_t * pFanReal0, * pFanReal1, * pResult;
if ( Ivy_ObjIsPo(pNode) )
{
if ( !Ivy_ObjIsBuf(Ivy_ObjFanin0(pNode)) )
return;
pFanReal0 = Ivy_ObjReal( Ivy_ObjChild0(pNode) );
Ivy_ObjPatchFanin0( p, pNode, pFanReal0 );
// Ivy_ManCheckFanouts( p );
return;
}
if ( !Ivy_ObjIsBuf(Ivy_ObjFanin0(pNode)) && !Ivy_ObjIsBuf(Ivy_ObjFanin1(pNode)) )
return;
// get the real fanins
pFanReal0 = Ivy_ObjReal( Ivy_ObjChild0(pNode) );
pFanReal1 = Ivy_ObjReal( Ivy_ObjChild1(pNode) );
// get the new node
if ( Ivy_ObjIsNode(pNode) )
pResult = Ivy_Oper( p, pFanReal0, pFanReal1, Ivy_ObjType(pNode) );
else if ( Ivy_ObjIsLatch(pNode) )
pResult = Ivy_Latch( p, pFanReal0, Ivy_ObjInit(pNode) );
else
assert( 0 );
//printf( "===== Replacing %d by %d.\n", pNode->Id, pResult->Id );
//Ivy_ObjPrintVerbose( p, pNode, 0 ); printf( "\n" );
//Ivy_ObjPrintVerbose( p, pResult, 0 ); printf( "\n" );
// perform the replacement
Ivy_ObjReplace( p, pNode, pResult, 1, 0, fUpdateLevel );
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
ABC_NAMESPACE_IMPL_END
|
