public void OperationResultEquality()
{
var same = new OperationResult(new AbstractValue(1), false);
var same2 = new OperationResult(new AbstractValue(1), false);
var different = new OperationResult(new AbstractValue(2), true);
Assert.IsTrue(same.Equals(same2));
Assert.IsFalse(same.Equals(different));
Assert.IsTrue(same == same2);
Assert.IsTrue(same != different);
Assert.AreEqual(same.GetHashCode(), same2.GetHashCode());
Assert.AreNotEqual(same.GetHashCode(), different.GetHashCode());
}
private static OperationResult DoOperation(AbstractValue lhs, OperatorEffect operatorEffect, AbstractValue rhs)
{
if (rhs.IsPointer &&
operatorEffect != OperatorEffect.Assignment)
{
throw new ArgumentException("rhs pointer only supported for OperatorEffect.Assignment.");
}
var result = new OperationResult();
AbstractValue totalValue;
if (operatorEffect == OperatorEffect.Assignment)
{
var newValue = new AbstractValue(rhs);
if (rhs.IsInitialized &&
rhs.IsOutOfBounds)
{
newValue.IsOutOfBounds = true;
}
result.Value = newValue;
return result;
}
if (operatorEffect == OperatorEffect.Cmp)
{
result.ZeroFlag = (lhs.Value - rhs.Value) == 0;
totalValue = lhs;
result.Value = totalValue;
return result;
}
if (lhs.IsPointer)
{
var newBuffer = lhs.PointsTo.DoOperation(operatorEffect, rhs);
result.Value = new AbstractValue(newBuffer);
return result;
}
var total = CalculateValueFor(lhs.Value, operatorEffect, rhs.Value);
totalValue = new AbstractValue(total);
if (lhs.IsTainted ||
rhs.IsTainted)
{
totalValue = totalValue.AddTaint();
}
result.Value = totalValue;
return result;
}