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Diffstat (limited to 'src/proof/bbr/bbrNtbdd.c')
| -rw-r--r-- | src/proof/bbr/bbrNtbdd.c | 218 |
1 files changed, 218 insertions, 0 deletions
diff --git a/src/proof/bbr/bbrNtbdd.c b/src/proof/bbr/bbrNtbdd.c new file mode 100644 index 00000000..09456df0 --- /dev/null +++ b/src/proof/bbr/bbrNtbdd.c @@ -0,0 +1,218 @@ +/**CFile**************************************************************** + + FileName [bbrNtbdd.c] + + SystemName [ABC: Logic synthesis and verification system.] + + PackageName [BDD-based reachability analysis.] + + Synopsis [Procedures to construct global BDDs for the network.] + + Author [Alan Mishchenko] + + Affiliation [UC Berkeley] + + Date [Ver. 1.0. Started - June 20, 2005.] + + Revision [$Id: bbrNtbdd.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $] + +***********************************************************************/ + +#include "bbr.h" +//#include "bar.h" + +ABC_NAMESPACE_IMPL_START + + +typedef char ProgressBar; + +//////////////////////////////////////////////////////////////////////// +/// DECLARATIONS /// +//////////////////////////////////////////////////////////////////////// + +static inline void Aig_ObjSetGlobalBdd( Aig_Obj_t * pObj, DdNode * bFunc ) { pObj->pData = bFunc; } +static inline void Aig_ObjCleanGlobalBdd( DdManager * dd, Aig_Obj_t * pObj ) { Cudd_RecursiveDeref( dd, (DdNode *)pObj->pData ); pObj->pData = NULL; } + +//////////////////////////////////////////////////////////////////////// +/// FUNCTION DEFINITIONS /// +//////////////////////////////////////////////////////////////////////// + +/**Function************************************************************* + + Synopsis [Derives the global BDD for one AIG node.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +DdNode * Bbr_NodeGlobalBdds_rec( DdManager * dd, Aig_Obj_t * pNode, int nBddSizeMax, int fDropInternal, ProgressBar * pProgress, int * pCounter, int fVerbose ) +{ + DdNode * bFunc, * bFunc0, * bFunc1; + assert( !Aig_IsComplement(pNode) ); + if ( Cudd_ReadKeys(dd)-Cudd_ReadDead(dd) > (unsigned)nBddSizeMax ) + { +// Extra_ProgressBarStop( pProgress ); + if ( fVerbose ) + printf( "The number of live nodes reached %d.\n", nBddSizeMax ); + fflush( stdout ); + return NULL; + } + // if the result is available return + if ( Aig_ObjGlobalBdd(pNode) == NULL ) + { + // compute the result for both branches + bFunc0 = Bbr_NodeGlobalBdds_rec( dd, Aig_ObjFanin0(pNode), nBddSizeMax, fDropInternal, pProgress, pCounter, fVerbose ); + if ( bFunc0 == NULL ) + return NULL; + Cudd_Ref( bFunc0 ); + bFunc1 = Bbr_NodeGlobalBdds_rec( dd, Aig_ObjFanin1(pNode), nBddSizeMax, fDropInternal, pProgress, pCounter, fVerbose ); + if ( bFunc1 == NULL ) + return NULL; + Cudd_Ref( bFunc1 ); + bFunc0 = Cudd_NotCond( bFunc0, Aig_ObjFaninC0(pNode) ); + bFunc1 = Cudd_NotCond( bFunc1, Aig_ObjFaninC1(pNode) ); + // get the final result + bFunc = Cudd_bddAnd( dd, bFunc0, bFunc1 ); Cudd_Ref( bFunc ); + Cudd_RecursiveDeref( dd, bFunc0 ); + Cudd_RecursiveDeref( dd, bFunc1 ); + // add the number of used nodes + (*pCounter)++; + // set the result + assert( Aig_ObjGlobalBdd(pNode) == NULL ); + Aig_ObjSetGlobalBdd( pNode, bFunc ); + // increment the progress bar +// if ( pProgress ) +// Extra_ProgressBarUpdate( pProgress, *pCounter, NULL ); + } + // prepare the return value + bFunc = Aig_ObjGlobalBdd(pNode); + // dereference BDD at the node + if ( --pNode->nRefs == 0 && fDropInternal ) + { + Cudd_Deref( bFunc ); + Aig_ObjSetGlobalBdd( pNode, NULL ); + } + return bFunc; +} + +/**Function************************************************************* + + Synopsis [Frees the global BDDs of the network.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +void Aig_ManFreeGlobalBdds( Aig_Man_t * p, DdManager * dd ) +{ + Aig_Obj_t * pObj; + int i; + Aig_ManForEachObj( p, pObj, i ) + if ( Aig_ObjGlobalBdd(pObj) ) + Aig_ObjCleanGlobalBdd( dd, pObj ); +} + +/**Function************************************************************* + + Synopsis [Returns the shared size of global BDDs of the COs.] + + Description [] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +int Aig_ManSizeOfGlobalBdds( Aig_Man_t * p ) +{ + Vec_Ptr_t * vFuncsGlob; + Aig_Obj_t * pObj; + int RetValue, i; + // complement the global functions + vFuncsGlob = Vec_PtrAlloc( Aig_ManPoNum(p) ); + Aig_ManForEachPo( p, pObj, i ) + Vec_PtrPush( vFuncsGlob, Aig_ObjGlobalBdd(pObj) ); + RetValue = Cudd_SharingSize( (DdNode **)Vec_PtrArray(vFuncsGlob), Vec_PtrSize(vFuncsGlob) ); + Vec_PtrFree( vFuncsGlob ); + return RetValue; +} + +/**Function************************************************************* + + Synopsis [Recursively computes global BDDs for the AIG in the manager.] + + Description [On exit, BDDs are stored in the pNode->pData fields.] + + SideEffects [] + + SeeAlso [] + +***********************************************************************/ +DdManager * Aig_ManComputeGlobalBdds( Aig_Man_t * p, int nBddSizeMax, int fDropInternal, int fReorder, int fVerbose ) +{ + ProgressBar * pProgress = NULL; + Aig_Obj_t * pObj; + DdManager * dd; + DdNode * bFunc; + int i, Counter; + // start the manager + dd = Cudd_Init( Aig_ManPiNum(p), 0, CUDD_UNIQUE_SLOTS, CUDD_CACHE_SLOTS, 0 ); + // set reordering + if ( fReorder ) + Cudd_AutodynEnable( dd, CUDD_REORDER_SYMM_SIFT ); + // prepare to construct global BDDs + Aig_ManCleanData( p ); + // assign the constant node BDD + Aig_ObjSetGlobalBdd( Aig_ManConst1(p), dd->one ); Cudd_Ref( dd->one ); + // set the elementary variables + Aig_ManForEachPi( p, pObj, i ) + { + Aig_ObjSetGlobalBdd( pObj, dd->vars[i] ); Cudd_Ref( dd->vars[i] ); + } + + // collect the global functions of the COs + Counter = 0; + // construct the BDDs +// pProgress = Extra_ProgressBarStart( stdout, Aig_ManNodeNum(p) ); + Aig_ManForEachPo( p, pObj, i ) + { + bFunc = Bbr_NodeGlobalBdds_rec( dd, Aig_ObjFanin0(pObj), nBddSizeMax, fDropInternal, pProgress, &Counter, fVerbose ); + if ( bFunc == NULL ) + { + if ( fVerbose ) + printf( "Constructing global BDDs is aborted.\n" ); + Aig_ManFreeGlobalBdds( p, dd ); + Cudd_Quit( dd ); + // reset references + Aig_ManResetRefs( p ); + return NULL; + } + bFunc = Cudd_NotCond( bFunc, Aig_ObjFaninC0(pObj) ); Cudd_Ref( bFunc ); + Aig_ObjSetGlobalBdd( pObj, bFunc ); + } +// Extra_ProgressBarStop( pProgress ); + // reset references + Aig_ManResetRefs( p ); + // reorder one more time + if ( fReorder ) + { + Cudd_ReduceHeap( dd, CUDD_REORDER_SYMM_SIFT, 1 ); + Cudd_AutodynDisable( dd ); + } +// Cudd_PrintInfo( dd, stdout ); + return dd; +} + +//////////////////////////////////////////////////////////////////////// +/// END OF FILE /// +//////////////////////////////////////////////////////////////////////// + + +ABC_NAMESPACE_IMPL_END + |