public override FlatAbstractDomain <bool> IsNotZero(DisInterval intv)
{
Contract.Assume(intv != null); // F: just lazy
if (intv.IsSingleton && intv.LowerBound.IsZero)
{
return(CheckOutcome.False);
}
if (intv.Meet(this.IntervalZero).IsBottom)
{
return(CheckOutcome.True);
}
return(CheckOutcome.Top);
}
public NonRelationalValueAbstraction <Variable, Expression> Meet(NonRelationalValueAbstraction <Variable, Expression> other)
{
Contract.Requires(other != null);
Contract.Ensures(Contract.Result <NonRelationalValueAbstraction <Variable, Expression> >() != null);
NonRelationalValueAbstraction <Variable, Expression> result;
if (AbstractDomainsHelper.TryTrivialMeet(this, other, out result))
{
return(result);
}
var intv = disInterval.Meet(other.Interval);
Contract.Assert(other.symbolicConditions != null);
var symbolicConditions = this.symbolicConditions.Meet(other.symbolicConditions);
Contract.Assert(other.weaklyRelationalDomains != null);
Contract.Assume(weaklyRelationalDomains.Length == other.weaklyRelationalDomains.Length);
var newWeaklyDomains = ParallelOperation(weaklyRelationalDomains, other.weaklyRelationalDomains, (x, y) => x.Meet(y));
return(new NonRelationalValueAbstraction <Variable, Expression>(intv, symbolicConditions, newWeaklyDomains));
}