private Argument(byte value, ushort? nextWord = null, Label nextLabel = null)
{
this.isValid = true;
this.value = value;
this.nextWord = nextWord;
this.nextLabel = nextLabel;
}
public Label DefineLabel()
{
AssertNotFinished();
Label label = new Label(this);
labels.Add(label);
return label;
}
private void ValidateLabel(Label label)
{
if (label.Generator != this)
throw new ArgumentException("Label must be defined in this generator.");
}
public void MarkLabel(Label label)
{
AssertNotFinished();
ValidateLabel(label);
if (label.MarkedPosition != null)
throw new CodeGenerationException("label already marked another position.");
label.MarkedPosition = checked((ushort)(CurrentBytePosition / 2));
}
public void EmitData(Label label)
{
AssertNotFinished();
ushort? nextWord;
GetArgumentValue(label, CurrentBytePosition, out nextWord);
WriteWord(stream, 0x0000);
}
public static Argument Literal(ushort value, Label address = null)
{
if (address == null && value <= 0x1f)
return new Argument((byte)(0x20 + value));
else
return new Argument(0x1f, value, address);
}
public static Argument Indirect(ushort offset, Label address = null)
{
return new Argument(0x1e, offset, address);
}
public static Argument Indirect(ushort offset, Register register, Label address = null)
{
ValidateRegister(register);
return new Argument((byte)(0x10 + register), offset, address);
}
