public Loader Fixup()
{
ushort labelAddress;
foreach (var reference in _labelReferences)
{
if (_labels.TryResolve(reference.Value.Label, out labelAddress))
{
var descriptor = reference.Value;
if (descriptor.Relative)
{
short relAddress = (short)(descriptor.Select(labelAddress - reference.Key - 1));
_addressMap.Write(reference.Key, (byte)relAddress);
}
else if (descriptor.OneByte)
{
var addressToUse = descriptor.Select(labelAddress + reference.Value.Offset);
if (addressToUse >= 0 && addressToUse < 0x100)
{
_addressMap.Write(reference.Key, (byte)addressToUse);
}
else
{
_logger.LogError($"FIXUP ERROR at ${reference.Key:X4} - label '{reference.Value.Label}' at ${addressToUse:X4} is not a single byte");
HasErrors = true;
}
}
else
{
var offsetAddress = descriptor.Select(labelAddress + reference.Value.Offset);
if (offsetAddress >= 0 && offsetAddress < 0x10000)
{
_addressMap.WriteWord(reference.Key, (ushort)offsetAddress);
}
else
{
_logger.LogError($"FIXUP ERROR at ${reference.Key:X4} - label '{reference.Value.Label}' at ${offsetAddress:X8} is not valid");
HasErrors = true;
}
}
}
else
{
_logger.LogError($"Error: 0x{reference.Key:X4} Label '{reference.Value} is not defined");
HasErrors = true;
}
}
_fixupRequired = false;
if (HasErrors)
{
throw new InvalidProgramException("There were errors in the loader");
}
return(this);
}
