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|
/**CFile****************************************************************
FileName [aigDfs.c]
SystemName [ABC: Logic synthesis and verification system.]
PackageName [AIG package.]
Synopsis [DFS traversal procedures.]
Author [Alan Mishchenko]
Affiliation [UC Berkeley]
Date [Ver. 1.0. Started - April 28, 2007.]
Revision [$Id: aigDfs.c,v 1.00 2007/04/28 00:00:00 alanmi Exp $]
***********************************************************************/
#include "aig.h"
////////////////////////////////////////////////////////////////////////
/// DECLARATIONS ///
////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFINITIONS ///
////////////////////////////////////////////////////////////////////////
/**Function*************************************************************
Synopsis [Collects internal nodes in the DFS order.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Aig_ManDfs_rec( Aig_Man_t * p, Aig_Obj_t * pObj, Vec_Ptr_t * vNodes )
{
if ( pObj == NULL )
return;
assert( !Aig_IsComplement(pObj) );
if ( Aig_ObjIsTravIdCurrent(p, pObj) )
return;
// if ( Aig_ObjIsPi(pObj) )
// return;
// assert( Aig_ObjIsNode(pObj) || Aig_ObjIsBuf(pObj) );
Aig_ObjSetTravIdCurrent(p, pObj);
Aig_ManDfs_rec( p, Aig_ObjFanin0(pObj), vNodes );
Aig_ManDfs_rec( p, Aig_ObjFanin1(pObj), vNodes );
// assert( !Aig_ObjIsTravIdCurrent(p, pObj) ); // loop detection
// Aig_ObjSetTravIdCurrent(p, pObj);
Vec_PtrPush( vNodes, pObj );
}
/**Function*************************************************************
Synopsis [Collects internal nodes in the DFS order.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Vec_Ptr_t * Aig_ManDfs( Aig_Man_t * p )
{
Vec_Ptr_t * vNodes;
Aig_Obj_t * pObj;
int i;
Aig_ManIncrementTravId( p );
// mark constant and PIs
Aig_ObjSetTravIdCurrent( p, Aig_ManConst1(p) );
Aig_ManForEachPi( p, pObj, i )
Aig_ObjSetTravIdCurrent( p, pObj );
// if there are latches, mark them
if ( Aig_ManLatchNum(p) > 0 )
Aig_ManForEachObj( p, pObj, i )
if ( Aig_ObjIsLatch(pObj) )
Aig_ObjSetTravIdCurrent( p, pObj );
// go through the nodes
vNodes = Vec_PtrAlloc( Aig_ManNodeNum(p) );
Aig_ManForEachObj( p, pObj, i )
if ( Aig_ObjIsNode(pObj) || Aig_ObjIsBuf(pObj) )
Aig_ManDfs_rec( p, pObj, vNodes );
return vNodes;
}
/**Function*************************************************************
Synopsis [Collects internal nodes in the DFS order.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Vec_Ptr_t * Aig_ManDfsPio( Aig_Man_t * p )
{
Vec_Ptr_t * vNodes;
Aig_Obj_t * pObj;
int i;
Aig_ManIncrementTravId( p );
vNodes = Vec_PtrAlloc( Aig_ManObjNumMax(p) );
Aig_ManForEachPo( p, pObj, i )
Aig_ManDfs_rec( p, pObj, vNodes );
return vNodes;
}
/**Function*************************************************************
Synopsis [Collects internal nodes and PIs in the DFS order.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Vec_Ptr_t * Aig_ManDfsNodes( Aig_Man_t * p, Aig_Obj_t ** ppNodes, int nNodes )
{
Vec_Ptr_t * vNodes;
// Aig_Obj_t * pObj;
int i;
assert( Aig_ManLatchNum(p) == 0 );
Aig_ManIncrementTravId( p );
// mark constant and PIs
Aig_ObjSetTravIdCurrent( p, Aig_ManConst1(p) );
// Aig_ManForEachPi( p, pObj, i )
// Aig_ObjSetTravIdCurrent( p, pObj );
// go through the nodes
vNodes = Vec_PtrAlloc( Aig_ManNodeNum(p) );
for ( i = 0; i < nNodes; i++ )
Aig_ManDfs_rec( p, ppNodes[i], vNodes );
return vNodes;
}
/**Function*************************************************************
Synopsis [Collects internal nodes in the DFS order.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Aig_ManDfsChoices_rec( Aig_Man_t * p, Aig_Obj_t * pObj, Vec_Ptr_t * vNodes )
{
if ( pObj == NULL )
return;
assert( !Aig_IsComplement(pObj) );
if ( Aig_ObjIsTravIdCurrent(p, pObj) )
return;
assert( Aig_ObjIsNode(pObj) );
Aig_ManDfsChoices_rec( p, Aig_ObjFanin0(pObj), vNodes );
Aig_ManDfsChoices_rec( p, Aig_ObjFanin1(pObj), vNodes );
Aig_ManDfsChoices_rec( p, p->pEquivs[pObj->Id], vNodes );
assert( !Aig_ObjIsTravIdCurrent(p, pObj) ); // loop detection
Aig_ObjSetTravIdCurrent(p, pObj);
Vec_PtrPush( vNodes, pObj );
}
/**Function*************************************************************
Synopsis [Collects internal nodes in the DFS order.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Vec_Ptr_t * Aig_ManDfsChoices( Aig_Man_t * p )
{
Vec_Ptr_t * vNodes;
Aig_Obj_t * pObj;
int i;
assert( p->pEquivs != NULL );
Aig_ManIncrementTravId( p );
// mark constant and PIs
Aig_ObjSetTravIdCurrent( p, Aig_ManConst1(p) );
Aig_ManForEachPi( p, pObj, i )
Aig_ObjSetTravIdCurrent( p, pObj );
// go through the nodes
vNodes = Vec_PtrAlloc( Aig_ManNodeNum(p) );
Aig_ManForEachPo( p, pObj, i )
Aig_ManDfsChoices_rec( p, Aig_ObjFanin0(pObj), vNodes );
return vNodes;
}
/**Function*************************************************************
Synopsis [Collects internal nodes in the reverse DFS order.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Aig_ManDfsReverse_rec( Aig_Man_t * p, Aig_Obj_t * pObj, Vec_Ptr_t * vNodes )
{
Aig_Obj_t * pFanout;
int iFanout = -1, i;
assert( !Aig_IsComplement(pObj) );
if ( Aig_ObjIsTravIdCurrent(p, pObj) )
return;
assert( Aig_ObjIsNode(pObj) || Aig_ObjIsBuf(pObj) );
Aig_ObjForEachFanout( p, pObj, pFanout, iFanout, i )
Aig_ManDfsReverse_rec( p, pFanout, vNodes );
assert( !Aig_ObjIsTravIdCurrent(p, pObj) ); // loop detection
Aig_ObjSetTravIdCurrent(p, pObj);
Vec_PtrPush( vNodes, pObj );
}
/**Function*************************************************************
Synopsis [Collects internal nodes in the reverse DFS order.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Vec_Ptr_t * Aig_ManDfsReverse( Aig_Man_t * p )
{
Vec_Ptr_t * vNodes;
Aig_Obj_t * pObj;
int i;
Aig_ManIncrementTravId( p );
// mark POs
Aig_ManForEachPo( p, pObj, i )
Aig_ObjSetTravIdCurrent( p, pObj );
// if there are latches, mark them
if ( Aig_ManLatchNum(p) > 0 )
Aig_ManForEachObj( p, pObj, i )
if ( Aig_ObjIsLatch(pObj) )
Aig_ObjSetTravIdCurrent( p, pObj );
// go through the nodes
vNodes = Vec_PtrAlloc( Aig_ManNodeNum(p) );
Aig_ManForEachObj( p, pObj, i )
if ( Aig_ObjIsNode(pObj) || Aig_ObjIsBuf(pObj) )
Aig_ManDfsReverse_rec( p, pObj, vNodes );
return vNodes;
}
/**Function*************************************************************
Synopsis [Computes the max number of levels in the manager.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Aig_ManLevelNum( Aig_Man_t * p )
{
Aig_Obj_t * pObj;
int i, LevelsMax;
LevelsMax = 0;
Aig_ManForEachPo( p, pObj, i )
LevelsMax = AIG_MAX( LevelsMax, (int)Aig_ObjFanin0(pObj)->Level );
return LevelsMax;
}
/**Function*************************************************************
Synopsis [Computes the max number of levels in the manager.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Aig_ManCountLevels( Aig_Man_t * p )
{
Vec_Ptr_t * vNodes;
Aig_Obj_t * pObj;
int i, LevelsMax, Level0, Level1;
// initialize the levels
Aig_ManConst1(p)->iData = 0;
Aig_ManForEachPi( p, pObj, i )
pObj->iData = 0;
// compute levels in a DFS order
vNodes = Aig_ManDfs( p );
Vec_PtrForEachEntry( vNodes, pObj, i )
{
Level0 = Aig_ObjFanin0(pObj)->iData;
Level1 = Aig_ObjFanin1(pObj)->iData;
pObj->iData = 1 + Aig_ObjIsExor(pObj) + AIG_MAX(Level0, Level1);
}
Vec_PtrFree( vNodes );
// get levels of the POs
LevelsMax = 0;
Aig_ManForEachPo( p, pObj, i )
LevelsMax = AIG_MAX( LevelsMax, Aig_ObjFanin0(pObj)->iData );
return LevelsMax;
}
/**Function*************************************************************
Synopsis [Counts the number of AIG nodes rooted at this cone.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Aig_ConeMark_rec( Aig_Obj_t * pObj )
{
assert( !Aig_IsComplement(pObj) );
if ( !Aig_ObjIsNode(pObj) || Aig_ObjIsMarkA(pObj) )
return;
Aig_ConeMark_rec( Aig_ObjFanin0(pObj) );
Aig_ConeMark_rec( Aig_ObjFanin1(pObj) );
assert( !Aig_ObjIsMarkA(pObj) ); // loop detection
Aig_ObjSetMarkA( pObj );
}
/**Function*************************************************************
Synopsis [Counts the number of AIG nodes rooted at this cone.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Aig_ConeCleanAndMark_rec( Aig_Obj_t * pObj )
{
assert( !Aig_IsComplement(pObj) );
if ( !Aig_ObjIsNode(pObj) || Aig_ObjIsMarkA(pObj) )
return;
Aig_ConeCleanAndMark_rec( Aig_ObjFanin0(pObj) );
Aig_ConeCleanAndMark_rec( Aig_ObjFanin1(pObj) );
assert( !Aig_ObjIsMarkA(pObj) ); // loop detection
Aig_ObjSetMarkA( pObj );
pObj->pData = NULL;
}
/**Function*************************************************************
Synopsis [Counts the number of AIG nodes rooted at this cone.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Aig_ConeCountAndMark_rec( Aig_Obj_t * pObj )
{
int Counter;
assert( !Aig_IsComplement(pObj) );
if ( !Aig_ObjIsNode(pObj) || Aig_ObjIsMarkA(pObj) )
return 0;
Counter = 1 + Aig_ConeCountAndMark_rec( Aig_ObjFanin0(pObj) ) +
Aig_ConeCountAndMark_rec( Aig_ObjFanin1(pObj) );
assert( !Aig_ObjIsMarkA(pObj) ); // loop detection
Aig_ObjSetMarkA( pObj );
return Counter;
}
/**Function*************************************************************
Synopsis [Counts the number of AIG nodes rooted at this cone.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Aig_ConeUnmark_rec( Aig_Obj_t * pObj )
{
assert( !Aig_IsComplement(pObj) );
if ( !Aig_ObjIsNode(pObj) || !Aig_ObjIsMarkA(pObj) )
return;
Aig_ConeUnmark_rec( Aig_ObjFanin0(pObj) );
Aig_ConeUnmark_rec( Aig_ObjFanin1(pObj) );
assert( Aig_ObjIsMarkA(pObj) ); // loop detection
Aig_ObjClearMarkA( pObj );
}
/**Function*************************************************************
Synopsis [Counts the number of AIG nodes rooted at this cone.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Aig_DagSize( Aig_Obj_t * pObj )
{
int Counter;
Counter = Aig_ConeCountAndMark_rec( Aig_Regular(pObj) );
Aig_ConeUnmark_rec( Aig_Regular(pObj) );
return Counter;
}
/**Function*************************************************************
Synopsis [Counts the support size of the node.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Aig_SupportSize_rec( Aig_Man_t * p, Aig_Obj_t * pObj, int * pCounter )
{
if ( Aig_ObjIsTravIdCurrent(p, pObj) )
return;
Aig_ObjSetTravIdCurrent(p, pObj);
if ( Aig_ObjIsPi(pObj) )
{
(*pCounter)++;
return;
}
assert( Aig_ObjIsNode(pObj) || Aig_ObjIsBuf(pObj) );
Aig_SupportSize_rec( p, Aig_ObjFanin0(pObj), pCounter );
if ( Aig_ObjFanin1(pObj) )
Aig_SupportSize_rec( p, Aig_ObjFanin1(pObj), pCounter );
}
/**Function*************************************************************
Synopsis [Counts the support size of the node.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Aig_SupportSize( Aig_Man_t * p, Aig_Obj_t * pObj )
{
int Counter = 0;
assert( !Aig_IsComplement(pObj) );
assert( !Aig_ObjIsPo(pObj) );
Aig_ManIncrementTravId( p );
Aig_SupportSize_rec( p, pObj, &Counter );
return Counter;
}
/**Function*************************************************************
Synopsis [Transfers the AIG from one manager into another.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Aig_Transfer_rec( Aig_Man_t * pDest, Aig_Obj_t * pObj )
{
assert( !Aig_IsComplement(pObj) );
if ( !Aig_ObjIsNode(pObj) || Aig_ObjIsMarkA(pObj) )
return;
Aig_Transfer_rec( pDest, Aig_ObjFanin0(pObj) );
Aig_Transfer_rec( pDest, Aig_ObjFanin1(pObj) );
pObj->pData = Aig_And( pDest, Aig_ObjChild0Copy(pObj), Aig_ObjChild1Copy(pObj) );
assert( !Aig_ObjIsMarkA(pObj) ); // loop detection
Aig_ObjSetMarkA( pObj );
}
/**Function*************************************************************
Synopsis [Transfers the AIG from one manager into another.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Aig_Obj_t * Aig_Transfer( Aig_Man_t * pSour, Aig_Man_t * pDest, Aig_Obj_t * pRoot, int nVars )
{
Aig_Obj_t * pObj;
int i;
// solve simple cases
if ( pSour == pDest )
return pRoot;
if ( Aig_ObjIsConst1( Aig_Regular(pRoot) ) )
return Aig_NotCond( Aig_ManConst1(pDest), Aig_IsComplement(pRoot) );
// set the PI mapping
Aig_ManForEachPi( pSour, pObj, i )
{
if ( i == nVars )
break;
pObj->pData = Aig_IthVar(pDest, i);
}
// transfer and set markings
Aig_Transfer_rec( pDest, Aig_Regular(pRoot) );
// clear the markings
Aig_ConeUnmark_rec( Aig_Regular(pRoot) );
return Aig_NotCond( Aig_Regular(pRoot)->pData, Aig_IsComplement(pRoot) );
}
/**Function*************************************************************
Synopsis [Composes the AIG (pRoot) with the function (pFunc) using PI var (iVar).]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Aig_Compose_rec( Aig_Man_t * p, Aig_Obj_t * pObj, Aig_Obj_t * pFunc, Aig_Obj_t * pVar )
{
assert( !Aig_IsComplement(pObj) );
if ( Aig_ObjIsMarkA(pObj) )
return;
if ( Aig_ObjIsConst1(pObj) || Aig_ObjIsPi(pObj) )
{
pObj->pData = pObj == pVar ? pFunc : pObj;
return;
}
Aig_Compose_rec( p, Aig_ObjFanin0(pObj), pFunc, pVar );
Aig_Compose_rec( p, Aig_ObjFanin1(pObj), pFunc, pVar );
pObj->pData = Aig_And( p, Aig_ObjChild0Copy(pObj), Aig_ObjChild1Copy(pObj) );
assert( !Aig_ObjIsMarkA(pObj) ); // loop detection
Aig_ObjSetMarkA( pObj );
}
/**Function*************************************************************
Synopsis [Composes the AIG (pRoot) with the function (pFunc) using PI var (iVar).]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Aig_Obj_t * Aig_Compose( Aig_Man_t * p, Aig_Obj_t * pRoot, Aig_Obj_t * pFunc, int iVar )
{
// quit if the PI variable is not defined
if ( iVar >= Aig_ManPiNum(p) )
{
printf( "Aig_Compose(): The PI variable %d is not defined.\n", iVar );
return NULL;
}
// recursively perform composition
Aig_Compose_rec( p, Aig_Regular(pRoot), pFunc, Aig_ManPi(p, iVar) );
// clear the markings
Aig_ConeUnmark_rec( Aig_Regular(pRoot) );
return Aig_NotCond( Aig_Regular(pRoot)->pData, Aig_IsComplement(pRoot) );
}
/**Function*************************************************************
Synopsis [Computes the internal nodes of the cut.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Aig_ObjCollectCut_rec( Aig_Obj_t * pNode, Vec_Ptr_t * vNodes )
{
// Aig_Obj_t * pFan0 = Aig_ObjFanin0(pNode);
// Aig_Obj_t * pFan1 = Aig_ObjFanin1(pNode);
if ( pNode->fMarkA )
return;
pNode->fMarkA = 1;
assert( Aig_ObjIsNode(pNode) );
Aig_ObjCollectCut_rec( Aig_ObjFanin0(pNode), vNodes );
Aig_ObjCollectCut_rec( Aig_ObjFanin1(pNode), vNodes );
Vec_PtrPush( vNodes, pNode );
//printf( "added %d ", pNode->Id );
}
/**Function*************************************************************
Synopsis [Computes the internal nodes of the cut.]
Description [Does not include the leaves of the cut.]
SideEffects []
SeeAlso []
***********************************************************************/
void Aig_ObjCollectCut( Aig_Obj_t * pRoot, Vec_Ptr_t * vLeaves, Vec_Ptr_t * vNodes )
{
Aig_Obj_t * pObj;
int i;
// collect and mark the leaves
Vec_PtrClear( vNodes );
Vec_PtrForEachEntry( vLeaves, pObj, i )
{
assert( pObj->fMarkA == 0 );
pObj->fMarkA = 1;
// printf( "%d " , pObj->Id );
}
//printf( "\n" );
// collect and mark the nodes
Aig_ObjCollectCut_rec( pRoot, vNodes );
// clean the nodes
Vec_PtrForEachEntry( vNodes, pObj, i )
pObj->fMarkA = 0;
Vec_PtrForEachEntry( vLeaves, pObj, i )
pObj->fMarkA = 0;
}
/**Function*************************************************************
Synopsis [Collects the nodes of the supergate.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Aig_ObjCollectSuper_rec( Aig_Obj_t * pRoot, Aig_Obj_t * pObj, Vec_Ptr_t * vSuper )
{
int RetValue1, RetValue2, i;
// check if the node is visited
if ( Aig_Regular(pObj)->fMarkA )
{
// check if the node occurs in the same polarity
for ( i = 0; i < vSuper->nSize; i++ )
if ( vSuper->pArray[i] == pObj )
return 1;
// check if the node is present in the opposite polarity
for ( i = 0; i < vSuper->nSize; i++ )
if ( vSuper->pArray[i] == Aig_Not(pObj) )
return -1;
assert( 0 );
return 0;
}
// if the new node is complemented or a PI, another gate begins
if ( pObj != pRoot && (Aig_IsComplement(pObj) || Aig_ObjType(pObj) != Aig_ObjType(pRoot) || Aig_ObjRefs(pObj) > 1) )
{
Vec_PtrPush( vSuper, pObj );
Aig_Regular(pObj)->fMarkA = 1;
return 0;
}
assert( !Aig_IsComplement(pObj) );
assert( Aig_ObjIsNode(pObj) );
// go through the branches
RetValue1 = Aig_ObjCollectSuper_rec( pRoot, Aig_ObjReal_rec( Aig_ObjChild0(pObj) ), vSuper );
RetValue2 = Aig_ObjCollectSuper_rec( pRoot, Aig_ObjReal_rec( Aig_ObjChild1(pObj) ), vSuper );
if ( RetValue1 == -1 || RetValue2 == -1 )
return -1;
// return 1 if at least one branch has a duplicate
return RetValue1 || RetValue2;
}
/**Function*************************************************************
Synopsis [Collects the nodes of the supergate.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Aig_ObjCollectSuper( Aig_Obj_t * pObj, Vec_Ptr_t * vSuper )
{
int RetValue, i;
assert( !Aig_IsComplement(pObj) );
assert( Aig_ObjIsNode(pObj) );
// collect the nodes in the implication supergate
Vec_PtrClear( vSuper );
RetValue = Aig_ObjCollectSuper_rec( pObj, pObj, vSuper );
assert( Vec_PtrSize(vSuper) > 1 );
// unmark the visited nodes
Vec_PtrForEachEntry( vSuper, pObj, i )
Aig_Regular(pObj)->fMarkA = 0;
// if we found the node and its complement in the same implication supergate,
// return empty set of nodes (meaning that we should use constant-0 node)
if ( RetValue == -1 )
vSuper->nSize = 0;
return RetValue;
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
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