// TODO: Check size of symbols (24/16/8) and use knowledge of CPU bank registers (K/DP/DB) to look at correct address
public int ReadAddress(int index, bool readWord, OffsetRegister offset, out int address)
{
address = index;
if (offset == OffsetRegister.X)
{
address += X;
}
if (offset == OffsetRegister.Y)
{
address += Y;
}
if (offset == OffsetRegister.IndirectY)
{
address = ReadAddress(address, true) + Y; // TODO: Page boundary crossing issue
}
if (offset == OffsetRegister.IndirectX)
{
address = ReadAddress(address + X, true);
}
if (address >= CpuData.Length || (readWord && address + 1 >= CpuData.Length))
{
return(-1);
}
return(CpuData[address] + (readWord ? (CpuData[address + 1] << 8) : 0));
}
public override string ToString()
{
var sb = new StringBuilder();
switch (ValueType)
{
case OperandValueType.Byte:
sb.Append("byte ");
break;
case OperandValueType.Word:
sb.Append("word ");
break;
case OperandValueType.Dword:
break;
default:
throw new Exception("Invalid operand value type"); // TODO
}
if (IsPointer)
{
sb.Append('[');
}
if (IsOffset)
{
sb.Append(OffsetRegister.ToString().ToLower());
sb.Append(" + ");
}
if (Type >= OperandType.ImmB && Type <= OperandType.ImmD)
{
sb.Append(Payload);
}
else
{
sb.Append(Type.ToString().ToLower());
}
if (IsPointer)
{
sb.Append(']');
}
return(sb.ToString());
}
public int ReadAddress(int index, bool readWord = false, OffsetRegister offset = OffsetRegister.None)
{
return(ReadAddress(index, readWord, offset, out var dummy));
}
