public Operand(Value value)
{
if (value!=null)
{
if (value.Size == 1)
{
_addressingMode = AddressingModes.Immediate;
}
else if (value.Size == 2)
{
if (value is Pointer)
{
_addressingMode = AddressingModes.Absolute;
}
else
{
_addressingMode = AddressingModes.BigImmediate;
}
}
else
{
throw new NotSupportedException("operands of size {" + value.Size + "} not supported");
}
}
else
{
_addressingMode = AddressingModes.Implied;
}
_value = value;
}
public Operand(Value value, AddressingModes addressingMode)
{
if (value == null)
{
if (_addressingMode != AddressingModes.Implied)
{
throw new InvalidOperationException("invalid address mode for null value operand {" + Enum.GetName(typeof(AddressingModes), addressingMode) + "}");
}
}
else
{
//Absolute = 4,
//Indexed = 8,
//Indirect = 16,
//IndirectPreIndexed = 32,
//IndirectPostIndexed = 64
if (new[] { 4, 8, 16, 32, 64 }.ToList().Contains((int)addressingMode))
{
if (value.Size != 2)
{
throw new InvalidOperationException("invalid address mode {" + Enum.GetName(typeof(AddressingModes), addressingMode) + "}");
}
}
}
_addressingMode = addressingMode;
_value = value;
}
public Operand()
{
_addressingMode = AddressingModes.Implied;
_value = null;
}