Beispiel #1
0
bool Egraph::isRootUF( Enode * e )
{
  assert( e );
  assert( config.sat_lazy_dtc != 0 );
  assert( config.logic == QF_UFIDL
       || config.logic == QF_UFLRA );
  //
  // Makes sense only for TAtoms
  //
  if ( !e->isTAtom( ) )
    return false;
  //
  // There is an arithmetic operator
  //
  if ( e->isArithmeticOp( ) && !e->isEq( ) )
    return false;
  //
  // Uninterpreted predicates are OK
  //
  if ( e->isUp( ) )
    return true;

  assert( e->isEq( ) );

  Enode * x = e->get1st( );
  Enode * y = e->get2nd( );
  //
  // We want equalities of the form x=y
  //
  if ( x->isArithmeticOp( )
    || y->isArithmeticOp( ) )
    return false;
  //
  // And they also have to have at least a member
  // that is not interface
  //
  if ( interface_terms_cache.find( x ) == interface_terms_cache.end( )
    || interface_terms_cache.find( y ) == interface_terms_cache.end( ) )
    return true;

  return false;
}
Beispiel #2
0
void Egraph::gatherInterfaceTerms( Enode * e )
{
  assert( config.sat_lazy_dtc != 0 );
  assert( config.logic == QF_UFIDL
       || config.logic == QF_UFLRA );

  assert( e );

  if ( config.verbosity > 2 )
    cerr << "# Egraph::Gathering interface terms" << endl;

  vector< Enode * > unprocessed_enodes;
  initDup1( );

  unprocessed_enodes.push_back( e );
  //
  // Visit the DAG of the term from the leaves to the root
  //
  while( !unprocessed_enodes.empty( ) )
  {
    Enode * enode = unprocessed_enodes.back( );
    //
    // Skip if the node has already been processed before
    //
    if ( isDup1( enode ) )
    {
      unprocessed_enodes.pop_back( );
      continue;
    }

    bool unprocessed_children = false;
    Enode * arg_list;
    for ( arg_list = enode->getCdr( ) ;
          arg_list != enil ;
          arg_list = arg_list->getCdr( ) )
    {
      Enode * arg = arg_list->getCar( );
      assert( arg->isTerm( ) );
      //
      // Push only if it is unprocessed
      //
      if ( !isDup1( arg ) )
      {
        unprocessed_enodes.push_back( arg );
        unprocessed_children = true;
      }
    }
    //
    // SKip if unprocessed_children
    //
    if ( unprocessed_children )
      continue;

    unprocessed_enodes.pop_back( );
    //
    // At this point, every child has been processed
    //
    if ( enode->isUFOp( ) )
    {
      // Retrieve arguments
      for ( Enode * arg_list = enode->getCdr( )
          ; !arg_list->isEnil( )
          ; arg_list = arg_list->getCdr( ) )
      {
        Enode * arg = arg_list->getCar( );
        // This is for sure an interface term
        if ( ( arg->isArithmeticOp( )
            || arg->isConstant( ) )
          && interface_terms_cache.insert( arg ).second )
        {
          interface_terms.push_back( arg );
          if ( config.verbosity > 2 )
            cerr << "# Egraph::Added interface term: " << arg << endl;
        }
        // We add this variable to the potential
        // interface terms or to interface terms if
        // already seen in LA
        else if ( arg->isVar( ) || arg->isConstant( ) )
        {
          if ( it_la.find( arg ) == it_la.end( ) )
            it_uf.insert( arg );
          else if ( interface_terms_cache.insert( arg ).second )
          {
            interface_terms.push_back( arg );
            if ( config.verbosity > 2 )
              cerr << "# Egraph::Added interface term: " << arg << endl;
          }
        }
      }
    }

    if ( enode->isArithmeticOp( )
      && !isRootUF( enode ) )
    {
      // Retrieve arguments
      for ( Enode * arg_list = enode->getCdr( )
          ; !arg_list->isEnil( )
          ; arg_list = arg_list->getCdr( ) )
      {
        Enode * arg = arg_list->getCar( );
        // This is for sure an interface term
        if ( arg->isUFOp( )
          && interface_terms_cache.insert( arg ).second )
        {
          interface_terms.push_back( arg );
          if ( config.verbosity > 2 )
            cerr << "# Egraph::Added interface term: " << arg << endl;
        }
        // We add this variable to the potential
        // interface terms or to interface terms if
        // already seen in UF
        else if ( arg->isVar( ) || arg->isConstant( ) )
        {
          if ( it_uf.find( arg ) == it_uf.end( ) )
            it_la.insert( arg );
          else if ( interface_terms_cache.insert( arg ).second )
          {
            interface_terms.push_back( arg );
            if ( config.verbosity > 2 )
              cerr << "# Egraph::Added interface term: " << arg << endl;
          }
        }
      }
    }

    assert( !isDup1( enode ) );
    storeDup1( enode );
  }

  doneDup1( );
}
Beispiel #3
0
bool Egraph::isPureUF( Enode * e )
{
  assert( config.sat_lazy_dtc != 0 );
  assert( config.logic == QF_UFIDL
       || config.logic == QF_UFLRA );

  assert( e );
  vector< Enode * > unprocessed_enodes;
  initDup1( );

  unprocessed_enodes.push_back( e );
  //
  // Visit the DAG of the term from the leaves to the root
  //
  while( !unprocessed_enodes.empty( ) )
  {
    Enode * enode = unprocessed_enodes.back( );
    //
    // Skip if the node has already been processed before
    //
    if ( isDup1( enode ) )
    {
      unprocessed_enodes.pop_back( );
      continue;
    }

    bool unprocessed_children = false;
    Enode * arg_list;
    for ( arg_list = enode->getCdr( ) ;
          arg_list != enil ;
          arg_list = arg_list->getCdr( ) )
    {
      Enode * arg = arg_list->getCar( );
      assert( arg->isTerm( ) );
      //
      // Push only if it is unprocessed
      //
      if ( !isDup1( arg ) )
      {
        unprocessed_enodes.push_back( arg );
        unprocessed_children = true;
      }
    }
    //
    // SKip if unprocessed_children
    //
    if ( unprocessed_children )
      continue;

    unprocessed_enodes.pop_back( );

    //
    // At this point, every child has been processed
    //
    if ( enode->isArithmeticOp( ) )
    {
      doneDup1( );
      return false;
    }

    assert( !isDup1( enode ) );
    storeDup1( enode );
  }

  doneDup1( );
  return true;
}