private void Set(GhostOperand operand, byte value, bool allowPc = false)
{
switch (operand.Type)
{
case GhostOperandType.ConstantIndirect:
this.data[operand.Value] = value;
break;
case GhostOperandType.Register:
this.registers[operand.Value] = value;
break;
case GhostOperandType.RegisterIndirect:
this.data[this.registers[operand.Value]] = value;
break;
default:
if (allowPc && operand.Type == GhostOperandType.ProgramCounter)
{
pc = value;
break;
}
throw new Exception();
}
}
private byte Get(GhostOperand operand)
{
switch (operand.Type)
{
case GhostOperandType.ProgramCounter:
return pc;
case GhostOperandType.Constant:
return operand.Value;
case GhostOperandType.ConstantIndirect:
return this.data[operand.Value];
case GhostOperandType.Register:
return this.registers[operand.Value];
case GhostOperandType.RegisterIndirect:
return this.data[this.registers[operand.Value]];
default:
throw new Exception();
}
}
