public override OperatorOutput GenerateBinary(AssemblerState assemblerState, AsmLine asmLine)
{
if (string.IsNullOrWhiteSpace(asmLine.Label))
{
assemblerState.RaiseError("IS must have a label.");
}
else
{
// TODO only integer constants and register substitutions are supported
// register
if (TryParseRegister(asmLine.Expr, out byte registerRef))
{
assemblerState.DefineVariable(asmLine.Label, new RegisterCompilerVariable(registerRef));
}
// constant
else if (int.TryParse(asmLine.Expr, out int constant))
{
assemblerState.DefineVariable(asmLine.Label, new ByteConstantAssemblerVariable((byte)constant));
}
else
{
assemblerState.RaiseError($"IS expression, '{asmLine.Expr}' must be a constant integer or register reference.");
}
}
return(new OperatorOutput());
}
public override OperatorOutput GenerateBinary(AssemblerState assemblerState, AsmLine asmLine)
{
// register alias
ulong location;
if (TryParseConstant(asmLine.Expr, out location))
{
assemblerState.ProgramCounter = location;
}
else
{
assemblerState.RaiseError("LOC expression must be a constant value.");
}
return(new OperatorOutput());
}
public override OperatorOutput GenerateBinary(AssemblerState assemblerState, AsmLine asmLine)
{
assemblerState.RaiseError($"'{Symbol}' is not implemented.");
return(new OperatorOutput());
}