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-rw-r--r--src/opt/nwk/nwkFanio.c320
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diff --git a/src/opt/nwk/nwkFanio.c b/src/opt/nwk/nwkFanio.c
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+++ b/src/opt/nwk/nwkFanio.c
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+/**CFile****************************************************************
+
+ FileName [nwkFanio.c]
+
+ SystemName [ABC: Logic synthesis and verification system.]
+
+ PackageName [Logic network representation.]
+
+ Synopsis [Manipulation of fanins/fanouts.]
+
+ Author [Alan Mishchenko]
+
+ Affiliation [UC Berkeley]
+
+ Date [Ver. 1.0. Started - June 20, 2005.]
+
+ Revision [$Id: nwkFanio.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "nwk.h"
+
+ABC_NAMESPACE_IMPL_START
+
+
+////////////////////////////////////////////////////////////////////////
+/// DECLARATIONS ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+/// FUNCTION DEFINITIONS ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+ Synopsis [Collects fanins of the node.]
+
+ Description []
+
+ SideEffects []
+
+ SeeAlso []
+
+***********************************************************************/
+void Nwk_ObjCollectFanins( Nwk_Obj_t * pNode, Vec_Ptr_t * vNodes )
+{
+ Nwk_Obj_t * pFanin;
+ int i;
+ Vec_PtrClear(vNodes);
+ Nwk_ObjForEachFanin( pNode, pFanin, i )
+ Vec_PtrPush( vNodes, pFanin );
+}
+
+/**Function*************************************************************
+
+ Synopsis [Collects fanouts of the node.]
+
+ Description []
+
+ SideEffects []
+
+ SeeAlso []
+
+***********************************************************************/
+void Nwk_ObjCollectFanouts( Nwk_Obj_t * pNode, Vec_Ptr_t * vNodes )
+{
+ Nwk_Obj_t * pFanout;
+ int i;
+ Vec_PtrClear(vNodes);
+ Nwk_ObjForEachFanout( pNode, pFanout, i )
+ Vec_PtrPush( vNodes, pFanout );
+}
+
+/**Function*************************************************************
+
+ Synopsis [Returns the number of the fanin of the node.]
+
+ Description []
+
+ SideEffects []
+
+ SeeAlso []
+
+***********************************************************************/
+int Nwk_ObjFindFanin( Nwk_Obj_t * pObj, Nwk_Obj_t * pFanin )
+{
+ Nwk_Obj_t * pTemp;
+ int i;
+ Nwk_ObjForEachFanin( pObj, pTemp, i )
+ if ( pTemp == pFanin )
+ return i;
+ return -1;
+}
+
+/**Function*************************************************************
+
+ Synopsis [Returns the number of the fanout of the node.]
+
+ Description []
+
+ SideEffects []
+
+ SeeAlso []
+
+***********************************************************************/
+int Nwk_ObjFindFanout( Nwk_Obj_t * pObj, Nwk_Obj_t * pFanout )
+{
+ Nwk_Obj_t * pTemp;
+ int i;
+ Nwk_ObjForEachFanout( pObj, pTemp, i )
+ if ( pTemp == pFanout )
+ return i;
+ return -1;
+}
+
+/**Function*************************************************************
+
+ Synopsis [Returns 1 if the node has to be reallocated.]
+
+ Description []
+
+ SideEffects []
+
+ SeeAlso []
+
+***********************************************************************/
+static inline int Nwk_ObjReallocIsNeeded( Nwk_Obj_t * pObj )
+{
+ return pObj->nFanins + pObj->nFanouts == pObj->nFanioAlloc;
+}
+
+/**Function*************************************************************
+
+ Synopsis [Reallocates the object.]
+
+ Description []
+
+ SideEffects []
+
+ SeeAlso []
+
+***********************************************************************/
+static Nwk_Obj_t * Nwk_ManReallocNode( Nwk_Obj_t * pObj )
+{
+ Nwk_Obj_t ** pFanioOld = pObj->pFanio;
+ assert( Nwk_ObjReallocIsNeeded(pObj) );
+ pObj->pFanio = (Nwk_Obj_t **)Aig_MmFlexEntryFetch( pObj->pMan->pMemObjs, 2 * pObj->nFanioAlloc * sizeof(Nwk_Obj_t *) );
+ memmove( pObj->pFanio, pFanioOld, pObj->nFanioAlloc * sizeof(Nwk_Obj_t *) );
+ pObj->nFanioAlloc *= 2;
+ pObj->pMan->nRealloced++;
+ return NULL;
+}
+
+/**Function*************************************************************
+
+ Synopsis [Creates fanout/fanin relationship between the nodes.]
+
+ Description []
+
+ SideEffects []
+
+ SeeAlso []
+
+***********************************************************************/
+void Nwk_ObjAddFanin( Nwk_Obj_t * pObj, Nwk_Obj_t * pFanin )
+{
+ int i;
+ assert( pObj->pMan == pFanin->pMan );
+ assert( pObj->Id >= 0 && pFanin->Id >= 0 );
+ if ( Nwk_ObjReallocIsNeeded(pObj) )
+ Nwk_ManReallocNode( pObj );
+ if ( Nwk_ObjReallocIsNeeded(pFanin) )
+ Nwk_ManReallocNode( pFanin );
+ for ( i = pObj->nFanins + pObj->nFanouts; i > pObj->nFanins; i-- )
+ pObj->pFanio[i] = pObj->pFanio[i-1];
+ pObj->pFanio[pObj->nFanins++] = pFanin;
+ pFanin->pFanio[pFanin->nFanins + pFanin->nFanouts++] = pObj;
+ pObj->Level = Abc_MaxInt( pObj->Level, pFanin->Level + Nwk_ObjIsNode(pObj) );
+}
+
+/**Function*************************************************************
+
+ Synopsis [Removes fanout/fanin relationship between the nodes.]
+
+ Description []
+
+ SideEffects []
+
+ SeeAlso []
+
+***********************************************************************/
+void Nwk_ObjDeleteFanin( Nwk_Obj_t * pObj, Nwk_Obj_t * pFanin )
+{
+ int i, k, Limit, fFound;
+ // remove pFanin from the fanin list of pObj
+ Limit = pObj->nFanins + pObj->nFanouts;
+ fFound = 0;
+ for ( k = i = 0; i < Limit; i++ )
+ if ( fFound || pObj->pFanio[i] != pFanin )
+ pObj->pFanio[k++] = pObj->pFanio[i];
+ else
+ fFound = 1;
+ assert( i == k + 1 ); // if it fails, likely because of duplicated fanin
+ pObj->nFanins--;
+ // remove pObj from the fanout list of pFanin
+ Limit = pFanin->nFanins + pFanin->nFanouts;
+ fFound = 0;
+ for ( k = i = pFanin->nFanins; i < Limit; i++ )
+ if ( fFound || pFanin->pFanio[i] != pObj )
+ pFanin->pFanio[k++] = pFanin->pFanio[i];
+ else
+ fFound = 1;
+ assert( i == k + 1 ); // if it fails, likely because of duplicated fanout
+ pFanin->nFanouts--;
+}
+
+/**Function*************************************************************
+
+ Synopsis [Replaces a fanin of the node.]
+
+ Description [The node is pObj. An old fanin of this node (pFaninOld) has to be
+ replaced by a new fanin (pFaninNew). Assumes that the node and the old fanin
+ are not complemented. The new fanin can be complemented. In this case, the
+ polarity of the new fanin will change, compared to the polarity of the old fanin.]
+
+ SideEffects []
+
+ SeeAlso []
+
+***********************************************************************/
+void Nwk_ObjPatchFanin( Nwk_Obj_t * pObj, Nwk_Obj_t * pFaninOld, Nwk_Obj_t * pFaninNew )
+{
+ int i, k, iFanin, Limit;
+ assert( pFaninOld != pFaninNew );
+ assert( pObj != pFaninOld );
+ assert( pObj != pFaninNew );
+ assert( pObj->pMan == pFaninOld->pMan );
+ assert( pObj->pMan == pFaninNew->pMan );
+ // update the fanin
+ iFanin = Nwk_ObjFindFanin( pObj, pFaninOld );
+ if ( iFanin == -1 )
+ {
+ printf( "Nwk_ObjPatchFanin(); Error! Node %d is not among", pFaninOld->Id );
+ printf( " the fanins of node %d...\n", pObj->Id );
+ return;
+ }
+ pObj->pFanio[iFanin] = pFaninNew;
+ // remove pObj from the fanout list of pFaninOld
+ Limit = pFaninOld->nFanins + pFaninOld->nFanouts;
+ for ( k = i = pFaninOld->nFanins; i < Limit; i++ )
+ if ( pFaninOld->pFanio[i] != pObj )
+ pFaninOld->pFanio[k++] = pFaninOld->pFanio[i];
+ pFaninOld->nFanouts--;
+ // add pObj to the fanout list of pFaninNew
+ if ( Nwk_ObjReallocIsNeeded(pFaninNew) )
+ Nwk_ManReallocNode( pFaninNew );
+ pFaninNew->pFanio[pFaninNew->nFanins + pFaninNew->nFanouts++] = pObj;
+}
+
+
+/**Function*************************************************************
+
+ Synopsis [Transfers fanout from the old node to the new node.]
+
+ Description []
+
+ SideEffects []
+
+ SeeAlso []
+
+***********************************************************************/
+void Nwk_ObjTransferFanout( Nwk_Obj_t * pNodeFrom, Nwk_Obj_t * pNodeTo )
+{
+ Vec_Ptr_t * vFanouts = pNodeFrom->pMan->vTemp;
+ Nwk_Obj_t * pTemp;
+ int nFanoutsOld, i;
+ assert( !Nwk_ObjIsCo(pNodeFrom) && !Nwk_ObjIsCo(pNodeTo) );
+ assert( pNodeFrom->pMan == pNodeTo->pMan );
+ assert( pNodeFrom != pNodeTo );
+ assert( Nwk_ObjFanoutNum(pNodeFrom) > 0 );
+ // get the fanouts of the old node
+ nFanoutsOld = Nwk_ObjFanoutNum(pNodeTo);
+ Nwk_ObjCollectFanouts( pNodeFrom, vFanouts );
+ // patch the fanin of each of them
+ Vec_PtrForEachEntry( Nwk_Obj_t *, vFanouts, pTemp, i )
+ Nwk_ObjPatchFanin( pTemp, pNodeFrom, pNodeTo );
+ assert( Nwk_ObjFanoutNum(pNodeFrom) == 0 );
+ assert( Nwk_ObjFanoutNum(pNodeTo) == nFanoutsOld + Vec_PtrSize(vFanouts) );
+}
+
+/**Function*************************************************************
+
+ Synopsis [Replaces the node by a new node.]
+
+ Description []
+
+ SideEffects []
+
+ SeeAlso []
+
+***********************************************************************/
+void Nwk_ObjReplace( Nwk_Obj_t * pNodeOld, Nwk_Obj_t * pNodeNew )
+{
+ assert( pNodeOld->pMan == pNodeNew->pMan );
+ assert( pNodeOld != pNodeNew );
+ assert( Nwk_ObjFanoutNum(pNodeOld) > 0 );
+ // transfer the fanouts to the old node
+ Nwk_ObjTransferFanout( pNodeOld, pNodeNew );
+ // remove the old node
+ Nwk_ManDeleteNode_rec( pNodeOld );
+}
+
+
+////////////////////////////////////////////////////////////////////////
+/// END OF FILE ///
+////////////////////////////////////////////////////////////////////////
+
+
+ABC_NAMESPACE_IMPL_END
+
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