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/**CFile****************************************************************
FileName [abcQbf.c]
SystemName [ABC: Logic synthesis and verification system.]
PackageName [Network and node package.]
Synopsis [Implementation of a simple QBF solver.]
Author [Alan Mishchenko]
Affiliation [UC Berkeley]
Date [Ver. 1.0. Started - June 20, 2005.]
Revision [$Id: abcQbf.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $]
***********************************************************************/
#include "abc.h"
/*
Implementation of a simple QBF solver along the lines of
A. Solar-Lezama, L. Tancau, R. Bodik, V. Saraswat, and S. Seshia,
"Combinatorial sketching for finite programs", 12th International
Conference on Architectural Support for Programming Languages and
Operating Systems (ASPLOS 2006), San Jose, CA, October 2006.
*/
////////////////////////////////////////////////////////////////////////
/// DECLARATIONS ///
////////////////////////////////////////////////////////////////////////
static void Abc_NtkModelToVector( Abc_Ntk_t * pNtk, Vec_Int_t * vPiValues );
static void Abc_NtkVectorClearPars( Vec_Int_t * vPiValues, int nPars );
static void Abc_NtkVectorClearVars( Abc_Ntk_t * pNtk, Vec_Int_t * vPiValues, int nPars );
static void Abc_NtkVectorPrintPars( Vec_Int_t * vPiValues, int nPars );
static void Abc_NtkVectorPrintVars( Abc_Ntk_t * pNtk, Vec_Int_t * vPiValues, int nPars );
////////////////////////////////////////////////////////////////////////
/// FUNCTION DEFINITIONS ///
////////////////////////////////////////////////////////////////////////
/**Function*************************************************************
Synopsis [Solve the QBF problem EpAx[M(p,x)].]
Description [Variables p go first, followed by variable x.
The number of parameters is nPars. The miter is in pNtk.
The miter expresses EQUALITY of the implementation and spec.]
SideEffects []
SeeAlso []
***********************************************************************/
void Abc_NtkQbf( Abc_Ntk_t * pNtk, int nPars, int fVerbose )
{
Abc_Ntk_t * pNtkVer, * pNtkSyn, * pNtkSyn2, * pNtkTemp;
Vec_Int_t * vPiValues;
int clkTotal = clock(), clkS, clkV;
int nIters, nIterMax = 500, nInputs, RetValue, fFound = 0;
assert( Abc_NtkIsStrash(pNtk) );
assert( Abc_NtkIsComb(pNtk) );
assert( Abc_NtkPoNum(pNtk) == 1 );
assert( nPars > 0 && nPars < Abc_NtkPiNum(pNtk) );
assert( Abc_NtkPiNum(pNtk)-nPars < 32 );
nInputs = Abc_NtkPiNum(pNtk) - nPars;
// initialize the synthesized network with 0000-combination
vPiValues = Vec_IntStart( Abc_NtkPiNum(pNtk) );
Abc_NtkVectorClearPars( vPiValues, nPars );
pNtkSyn = Abc_NtkMiterCofactor( pNtk, vPiValues );
if ( fVerbose )
{
printf( "Iter %2d : ", 0 );
printf( "AIG = %6d ", Abc_NtkNodeNum(pNtkSyn) );
Abc_NtkVectorPrintVars( pNtk, vPiValues, nPars );
printf( "\n" );
}
// iteratively solve
for ( nIters = 0; nIters < nIterMax; nIters++ )
{
// solve the synthesis instance
clkS = clock();
RetValue = Abc_NtkMiterSat( pNtkSyn, 0, 0, 0, NULL, NULL );
clkS = clock() - clkS;
if ( RetValue == 0 )
Abc_NtkModelToVector( pNtkSyn, vPiValues );
if ( RetValue == 1 )
{
break;
}
if ( RetValue == -1 )
{
printf( "Synthesis timed out.\n" );
break;
}
// there is a counter-example
// construct the verification instance
Abc_NtkVectorClearVars( pNtk, vPiValues, nPars );
pNtkVer = Abc_NtkMiterCofactor( pNtk, vPiValues );
// complement the output
Abc_ObjXorFaninC( Abc_NtkPo(pNtkVer,0), 0 );
// solve the verification instance
clkV = clock();
RetValue = Abc_NtkMiterSat( pNtkVer, 0, 0, 0, NULL, NULL );
clkV = clock() - clkV;
if ( RetValue == 0 )
Abc_NtkModelToVector( pNtkVer, vPiValues );
Abc_NtkDelete( pNtkVer );
if ( RetValue == 1 )
{
fFound = 1;
break;
}
if ( RetValue == -1 )
{
printf( "Verification timed out.\n" );
break;
}
// there is a counter-example
// create a new synthesis network
Abc_NtkVectorClearPars( vPiValues, nPars );
pNtkSyn2 = Abc_NtkMiterCofactor( pNtk, vPiValues );
// add to the synthesis instance
pNtkSyn = Abc_NtkMiterAnd( pNtkTemp = pNtkSyn, pNtkSyn2, 0, 0 );
Abc_NtkDelete( pNtkSyn2 );
Abc_NtkDelete( pNtkTemp );
if ( fVerbose )
{
printf( "Iter %2d : ", nIters+1 );
printf( "AIG = %6d ", Abc_NtkNodeNum(pNtkSyn) );
Abc_NtkVectorPrintVars( pNtk, vPiValues, nPars );
printf( " " );
// PRTn( "Syn", clkS );
PRT( "Ver", clkV );
}
}
Abc_NtkDelete( pNtkSyn );
// report the results
if ( fFound )
{
printf( "Parameters: " );
Abc_NtkVectorPrintPars( vPiValues, nPars );
printf( "\n" );
printf( "Solved after %d interations. ", nIters );
}
else if ( nIters == nIterMax )
printf( "Unsolved after %d interations. ", nIters );
else
printf( "Implementation does not exist. " );
PRT( "Total runtime", clock() - clkTotal );
Vec_IntFree( vPiValues );
}
/**Function*************************************************************
Synopsis [Translates model into the vector of values.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Abc_NtkModelToVector( Abc_Ntk_t * pNtk, Vec_Int_t * vPiValues )
{
int * pModel, i;
pModel = pNtk->pModel;
for ( i = 0; i < Abc_NtkPiNum(pNtk); i++ )
Vec_IntWriteEntry( vPiValues, i, pModel[i] );
}
/**Function*************************************************************
Synopsis [Clears parameters.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Abc_NtkVectorClearPars( Vec_Int_t * vPiValues, int nPars )
{
int i;
for ( i = 0; i < nPars; i++ )
Vec_IntWriteEntry( vPiValues, i, -1 );
}
/**Function*************************************************************
Synopsis [Clears variables.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Abc_NtkVectorClearVars( Abc_Ntk_t * pNtk, Vec_Int_t * vPiValues, int nPars )
{
int i;
for ( i = nPars; i < Abc_NtkPiNum(pNtk); i++ )
Vec_IntWriteEntry( vPiValues, i, -1 );
}
/**Function*************************************************************
Synopsis [Clears variables.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Abc_NtkVectorPrintPars( Vec_Int_t * vPiValues, int nPars )
{
int i;
for ( i = 0; i < nPars; i++ )
printf( "%d", Vec_IntEntry(vPiValues,i) );
}
/**Function*************************************************************
Synopsis [Clears variables.]
Description []
SideEffects []
SeeAlso []
***********************************************************************/
void Abc_NtkVectorPrintVars( Abc_Ntk_t * pNtk, Vec_Int_t * vPiValues, int nPars )
{
int i;
for ( i = nPars; i < Abc_NtkPiNum(pNtk); i++ )
printf( "%d", Vec_IntEntry(vPiValues,i) );
}
////////////////////////////////////////////////////////////////////////
/// END OF FILE ///
////////////////////////////////////////////////////////////////////////
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