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/**CFile****************************************************************
FileName [fraBmc.c]
SystemName [ABC: Logic synthesis and verification system.]
PackageName [New FRAIG package.]
Synopsis [Bounded model checking.]
Author [Alan Mishchenko]
Affiliation [UC Berkeley]
Date [Ver. 1.0. Started - June 30, 2007.]
Revision [$Id: fraBmc.c,v 1.00 2007/06/30 00:00:00 alanmi Exp $]
***********************************************************************/
#include "fra.h"
////////////////////////////////////////////////////////////////////////
/// DECLARATIONS ///
////////////////////////////////////////////////////////////////////////
// simulation manager
struct Fra_Bmc_t_
{
// parameters
int nPref; // the size of the prefix
int nDepth; // the depth of the frames
int nFramesAll; // the total number of timeframes
// implications to be filtered
Vec_Int_t * vImps;
// AIG managers
Aig_Man_t * pAig; // the original AIG manager
Aig_Man_t * pAigFrames; // initialized timeframes
Aig_Man_t * pAigFraig; // the fraiged initialized timeframes
// mapping of nodes
Aig_Obj_t ** pObjToFrames; // mapping of the original node into frames
Aig_Obj_t ** pObjToFraig; // mapping of the frames node into fraig
};
static inline Aig_Obj_t * Bmc_ObjFrames( Aig_Obj_t * pObj, int i ) { return ((Fra_Man_t *)pObj->pData)->pBmc->pObjToFrames[((Fra_Man_t *)pObj->pData)->pBmc->nFramesAll*pObj->Id + i]; }
static inline void Bmc_ObjSetFrames( Aig_Obj_t * pObj, int i, Aig_Obj_t * pNode ) { ((Fra_Man_t *)pObj->pData)->pBmc->pObjToFrames[((Fra_Man_t *)pObj->pData)->pBmc->nFramesAll*pObj->Id + i] = pNode; }
static inline Aig_Obj_t * Bmc_ObjFraig( Aig_Obj_t * pObj ) { return ((Fra_Man_t *)pObj->pData)->pBmc->pObjToFraig[pObj->Id]; }
static inline void Bmc_ObjSetFraig( Aig_Obj_t * pObj, Aig_Obj_t * pNode ) { ((Fra_Man_t *)pObj->pData)->pBmc->pObjToFraig[pObj->Id] = pNode; }
static inline Aig_Obj_t * Bmc_ObjChild0Frames( Aig_Obj_t * pObj, int i ) { assert( !Aig_IsComplement(pObj) ); return Aig_ObjFanin0(pObj)? Aig_NotCond(Bmc_ObjFrames(Aig_ObjFanin0(pObj),i), Aig_ObjFaninC0(pObj)) : NULL; }
static inline Aig_Obj_t * Bmc_ObjChild1Frames( Aig_Obj_t * pObj, int i ) { assert( !Aig_IsComplement(pObj) ); return Aig_ObjFanin1(pObj)? Aig_NotCond(Bmc_ObjFrames(Aig_ObjFanin1(pObj),i), Aig_ObjFaninC1(pObj)) : NULL; }
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFINITIONS ///
////////////////////////////////////////////////////////////////////////
/**Function*************************************************************
Synopsis [Returns 1 if the nodes are equivalent.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Fra_BmcNodesAreEqual( Aig_Obj_t * pObj0, Aig_Obj_t * pObj1 )
{
Fra_Man_t * p = pObj0->pData;
Aig_Obj_t * pObjFrames0, * pObjFrames1;
Aig_Obj_t * pObjFraig0, * pObjFraig1;
int i;
for ( i = p->pBmc->nPref; i < p->pBmc->nFramesAll; i++ )
{
pObjFrames0 = Aig_Regular( Bmc_ObjFrames(pObj0, i) );
pObjFrames1 = Aig_Regular( Bmc_ObjFrames(pObj1, i) );
if ( pObjFrames0 == pObjFrames1 )
continue;
pObjFraig0 = Aig_Regular( Bmc_ObjFraig(pObjFrames0) );
pObjFraig1 = Aig_Regular( Bmc_ObjFraig(pObjFrames1) );
if ( pObjFraig0 != pObjFraig1 )
return 0;
}
return 1;
}
/**Function*************************************************************
Synopsis [Returns 1 if the node is costant.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
int Fra_BmcNodeIsConst( Aig_Obj_t * pObj )
{
Fra_Man_t * p = pObj->pData;
return Fra_BmcNodesAreEqual( pObj, Aig_ManConst1(p->pManAig) );
}
/**Function*************************************************************
Synopsis [Refines implications using BMC.]
Description [The input is the combinational FRAIG manager,
which is used to FRAIG the timeframes. ]
SideEffects []
SeeAlso []
***********************************************************************/
void Fra_BmcFilterImplications( Fra_Man_t * p, Fra_Bmc_t * pBmc )
{
Aig_Obj_t * pLeft, * pRight;
Aig_Obj_t * pLeftT, * pRightT;
Aig_Obj_t * pLeftF, * pRightF;
int i, f, Imp, Left, Right;
int fComplL, fComplR;
assert( p->nFramesAll == 1 );
assert( p->pManAig == pBmc->pAigFrames );
Vec_IntForEachEntry( pBmc->vImps, Imp, i )
{
if ( Imp == 0 )
continue;
Left = Fra_ImpLeft(Imp);
Right = Fra_ImpRight(Imp);
// get the corresponding nodes
pLeft = Aig_ManObj( pBmc->pAig, Left );
pRight = Aig_ManObj( pBmc->pAig, Right );
// iterate through the timeframes
for ( f = pBmc->nPref; f < pBmc->nFramesAll; f++ )
{
// get timeframe nodes
pLeftT = Bmc_ObjFrames( pLeft, f );
pRightT = Bmc_ObjFrames( pRight, f );
// get the corresponding FRAIG nodes
pLeftF = Fra_ObjFraig( Aig_Regular(pLeftT), 0 );
pRightF = Fra_ObjFraig( Aig_Regular(pRightT), 0 );
// get the complemented attributes
fComplL = pLeft->fPhase ^ Aig_IsComplement(pLeftF) ^ Aig_IsComplement(pLeftT);
fComplR = pRight->fPhase ^ Aig_IsComplement(pRightF) ^ Aig_IsComplement(pRightT);
// check equality
if ( Aig_Regular(pLeftF) == Aig_Regular(pRightF) )
{
if ( fComplL == fComplR ) // x => x - always true
continue;
assert( fComplL != fComplR );
// consider 4 possibilities:
// NOT(1) => 1 or 0 => 1 - always true
// 1 => NOT(1) or 1 => 0 - never true
// NOT(x) => x or x - not always true
// x => NOT(x) or NOT(x) - not always true
if ( Aig_ObjIsConst1(Aig_Regular(pLeftF)) && fComplL ) // proved implication
continue;
// disproved implication
Vec_IntWriteEntry( pBmc->vImps, i, 0 );
break;
}
// check the implication
if ( Fra_NodesAreImp( p, Aig_Regular(pLeftF), Aig_Regular(pRightF), fComplL, fComplR ) != 1 )
{
Vec_IntWriteEntry( pBmc->vImps, i, 0 );
break;
}
}
}
Fra_ImpCompactArray( pBmc->vImps );
}
/**Function*************************************************************
Synopsis [Starts the BMC manager.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Fra_Bmc_t * Fra_BmcStart( Aig_Man_t * pAig, int nPref, int nDepth )
{
Fra_Bmc_t * p;
p = ALLOC( Fra_Bmc_t, 1 );
memset( p, 0, sizeof(Fra_Bmc_t) );
p->pAig = pAig;
p->nPref = nPref;
p->nDepth = nDepth;
p->nFramesAll = nPref + nDepth;
p->pObjToFrames = ALLOC( Aig_Obj_t *, p->nFramesAll * Aig_ManObjNumMax(pAig) );
memset( p->pObjToFrames, 0, sizeof(Aig_Obj_t *) * p->nFramesAll * Aig_ManObjNumMax(pAig) );
return p;
}
/**Function*************************************************************
Synopsis [Stops the BMC manager.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Fra_BmcStop( Fra_Bmc_t * p )
{
Aig_ManStop( p->pAigFrames );
if ( p->pAigFraig )
Aig_ManStop( p->pAigFraig );
free( p->pObjToFrames );
free( p->pObjToFraig );
free( p );
}
/**Function*************************************************************
Synopsis [Constructs initialized timeframes of the AIG.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
Aig_Man_t * Fra_BmcFrames( Fra_Bmc_t * p, int fKeepPos )
{
Aig_Man_t * pAigFrames;
Aig_Obj_t * pObj, * pObjNew;
Aig_Obj_t ** pLatches;
int i, k, f;
// start the fraig package
pAigFrames = Aig_ManStart( Aig_ManObjNumMax(p->pAig) * p->nFramesAll );
pAigFrames->pName = Aig_UtilStrsav( p->pAig->pName );
// create PI nodes for the frames
for ( f = 0; f < p->nFramesAll; f++ )
Bmc_ObjSetFrames( Aig_ManConst1(p->pAig), f, Aig_ManConst1(pAigFrames) );
for ( f = 0; f < p->nFramesAll; f++ )
Aig_ManForEachPiSeq( p->pAig, pObj, i )
Bmc_ObjSetFrames( pObj, f, Aig_ObjCreatePi(pAigFrames) );
// set initial state for the latches
Aig_ManForEachLoSeq( p->pAig, pObj, i )
Bmc_ObjSetFrames( pObj, 0, Aig_ManConst0(pAigFrames) );
// add timeframes
pLatches = ALLOC( Aig_Obj_t *, Aig_ManRegNum(p->pAig) );
for ( f = 0; f < p->nFramesAll; f++ )
{
// add internal nodes of this frame
Aig_ManForEachNode( p->pAig, pObj, i )
{
pObjNew = Aig_And( pAigFrames, Bmc_ObjChild0Frames(pObj,f), Bmc_ObjChild1Frames(pObj,f) );
Bmc_ObjSetFrames( pObj, f, pObjNew );
}
if ( f == p->nFramesAll - 1 )
break;
// save the latch input values
k = 0;
Aig_ManForEachLiSeq( p->pAig, pObj, i )
pLatches[k++] = Bmc_ObjChild0Frames(pObj,f);
assert( k == Aig_ManRegNum(p->pAig) );
// insert them to the latch output values
k = 0;
Aig_ManForEachLoSeq( p->pAig, pObj, i )
Bmc_ObjSetFrames( pObj, f+1, pLatches[k++] );
assert( k == Aig_ManRegNum(p->pAig) );
}
free( pLatches );
if ( fKeepPos )
{
for ( f = 0; f < p->nFramesAll; f++ )
Aig_ManForEachPoSeq( p->pAig, pObj, i )
Aig_ObjCreatePo( pAigFrames, Bmc_ObjChild0Frames(pObj,f) );
Aig_ManCleanup( pAigFrames );
}
else
{
// add POs to all the dangling nodes
Aig_ManForEachObj( pAigFrames, pObjNew, i )
if ( Aig_ObjIsNode(pObjNew) && pObjNew->nRefs == 0 )
Aig_ObjCreatePo( pAigFrames, pObjNew );
}
// return the new manager
return pAigFrames;
}
/**Function*************************************************************
Synopsis [Performs BMC for the given AIG.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Fra_BmcPerform( Fra_Man_t * p, int nPref, int nDepth )
{
Aig_Obj_t * pObj;
int i, nImpsOld = 0, clk = clock();
assert( p->pBmc == NULL );
// derive and fraig the frames
p->pBmc = Fra_BmcStart( p->pManAig, nPref, nDepth );
p->pBmc->pAigFrames = Fra_BmcFrames( p->pBmc, 0 );
// if implications are present, configure the AIG manager to check them
if ( p->pCla->vImps )
{
p->pBmc->pAigFrames->pImpFunc = (void (*) (void*, void*))Fra_BmcFilterImplications;
p->pBmc->pAigFrames->pImpData = p->pBmc;
p->pBmc->vImps = p->pCla->vImps;
nImpsOld = Vec_IntSize(p->pCla->vImps);
}
p->pBmc->pAigFraig = Fra_FraigEquivence( p->pBmc->pAigFrames, 1000000, 0 );
p->pBmc->pObjToFraig = p->pBmc->pAigFrames->pObjCopies;
p->pBmc->pAigFrames->pObjCopies = NULL;
// annotate frames nodes with pointers to the manager
Aig_ManForEachObj( p->pBmc->pAigFrames, pObj, i )
pObj->pData = p;
// report the results
if ( p->pPars->fVerbose )
{
printf( "Original AIG = %d. Init %d frames = %d. Fraig = %d. ",
Aig_ManNodeNum(p->pBmc->pAig), p->pBmc->nFramesAll,
Aig_ManNodeNum(p->pBmc->pAigFrames), Aig_ManNodeNum(p->pBmc->pAigFraig) );
PRT( "Time", clock() - clk );
printf( "Before BMC: " );
// Fra_ClassesPrint( p->pCla, 0 );
printf( "Const = %5d. Class = %5d. Lit = %5d. ",
Vec_PtrSize(p->pCla->vClasses1), Vec_PtrSize(p->pCla->vClasses), Fra_ClassesCountLits(p->pCla) );
if ( p->pCla->vImps )
printf( "Imp = %5d. ", nImpsOld );
printf( "\n" );
}
// refine the classes
p->pCla->pFuncNodeIsConst = Fra_BmcNodeIsConst;
p->pCla->pFuncNodesAreEqual = Fra_BmcNodesAreEqual;
Fra_ClassesRefine( p->pCla );
Fra_ClassesRefine1( p->pCla, 1, NULL );
p->pCla->pFuncNodeIsConst = Fra_SmlNodeIsConst;
p->pCla->pFuncNodesAreEqual = Fra_SmlNodesAreEqual;
// report the results
if ( p->pPars->fVerbose )
{
printf( "After BMC: " );
// Fra_ClassesPrint( p->pCla, 0 );
printf( "Const = %5d. Class = %5d. Lit = %5d. ",
Vec_PtrSize(p->pCla->vClasses1), Vec_PtrSize(p->pCla->vClasses), Fra_ClassesCountLits(p->pCla) );
if ( p->pCla->vImps )
printf( "Imp = %5d. ", Vec_IntSize(p->pCla->vImps) );
printf( "\n" );
}
// free the BMC manager
Fra_BmcStop( p->pBmc );
p->pBmc = NULL;
}
/**Function*************************************************************
Synopsis [Performs BMC for the given AIG.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Fra_BmcPerformSimple( Aig_Man_t * pAig, int nFrames, int nBTLimit, int fRewrite, int fVerbose )
{
extern Fra_Man_t * Fra_LcrAigPrepare( Aig_Man_t * pAig );
Fra_Man_t * pTemp;
Fra_Bmc_t * pBmc;
Aig_Man_t * pAigTemp;
int iOutput;
// derive and fraig the frames
pBmc = Fra_BmcStart( pAig, 0, nFrames );
pTemp = Fra_LcrAigPrepare( pAig );
pTemp->pBmc = pBmc;
pBmc->pAigFrames = Fra_BmcFrames( pBmc, 1 );
if ( fRewrite )
{
pBmc->pAigFrames = Dar_ManRwsat( pAigTemp = pBmc->pAigFrames, 1, 0 );
Aig_ManStop( pAigTemp );
}
iOutput = Fra_FraigMiterAssertedOutput( pBmc->pAigFrames );
if ( iOutput >= 0 )
pAig->pSeqModel = Fra_SmlTrivCounterExample( pAig, iOutput );
else
{
pBmc->pAigFraig = Fra_FraigEquivence( pBmc->pAigFrames, nBTLimit, 1 );
iOutput = Fra_FraigMiterAssertedOutput( pBmc->pAigFraig );
if ( pBmc->pAigFraig->pData )
{
pAig->pSeqModel = Fra_SmlCopyCounterExample( pAig, pBmc->pAigFrames, pBmc->pAigFraig->pData );
FREE( pBmc->pAigFraig->pData );
}
else if ( iOutput >= 0 )
pAig->pSeqModel = Fra_SmlTrivCounterExample( pAig, iOutput );
}
if ( fVerbose )
printf( "nFrames = %3d. Aig = %6d. Init frames = %6d. Fraiged init frames = %6d.\n",
nFrames, Aig_ManNodeNum(pAig), Aig_ManNodeNum(pBmc->pAigFrames), pBmc->pAigFraig? Aig_ManNodeNum(pBmc->pAigFraig) : -1 );
Fra_BmcStop( pBmc );
free( pTemp );
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
|
