public static OpcodeDefinition Find(OpcodeByte opcode,
OpcodeByte ext1 = null, OpcodeByte ext2 = null)
{
var result = FindInternal(opcode, ext1, ext2);
//if (result == null &&
// ext1 != null && ext1.Value != 0)
//{
// // shift extensions
// result = FindInternal(opcode, ext2, OpcodeByte.Empty);
//}
return(result);
}
private static OpcodeDefinition FindInternal(OpcodeByte opcode, OpcodeByte ext1, OpcodeByte ext2)
{
if (ext1 != null && ext2 != null)
{
return(_twoExtensions[ext2.Value << 16 | ext1.Value << 8 | opcode.Value]);
}
else if (ext1 != null && ext2 == null)
{
return(_oneExtension[ext1.Value << 8 | opcode.Value]);
}
else
{
return(_noExtensions[opcode.Value]);
}
}
public static UInt16 MakeUInt16(OpcodeByte lsb, OpcodeByte msb)
{
return((UInt16)((msb.Value << 8) | lsb.Value));
}
private bool Process(OpcodeByte opcodeByte)
{
if (_opcodeDef == null)
{
if (opcodeByte.IsExtension && !HasReversedOffsetParameterOrder)
{
SetExtension(opcodeByte);
}
else if (HasReversedOffsetParameterOrder && _tmpOffset == null)
{
_tmpOffset = opcodeByte;
}
else
{
_opcodeDef = OpcodeDefinition.Find(opcodeByte, _ext1, _ext2);
if (_opcodeDef == null)
{
throw new NotSupportedException("Illegal opcode:" + opcodeByte.ToString());
}
if (!_opcodeDef.HasParameters)
{
Opcode = new SingleByteOpcode(_opcodeDef);
IsDone = true;
}
else
{
var mbo = new MultiByteOpcode(_opcodeDef);
Opcode = mbo;
if (_tmpOffset != null)
{
if (!_opcodeDef.d)
{
throw new InvalidOperationException(
string.Format("Found a reversed d-offset parameter for opcode {0} but it does not have a d-parameter (true).", _opcodeDef.ToString()));
}
mbo.AddParameter(_tmpOffset);
IsDone = mbo.ParameterCount == _opcodeDef.ParameterCount;
}
}
}
}
else // parameters
{
var mbo = Opcode as MultiByteOpcode;
if (mbo == null)
{
throw new InvalidOperationException("OpcodeBuilder already produced an Opcode -or- " +
"you are adding parameters to a SingleCycleOpcode. Did you forget to call Clear?");
}
int paramCount = _opcodeDef.ParameterCount;
mbo.AddParameter(opcodeByte);
if (mbo.ParameterCount > paramCount)
{
throw new InvalidOperationException("Too many parameters.");
}
IsDone = mbo.ParameterCount == paramCount;
}
return(Opcode != null);
}
private static IEnumerable <OpcodeDefinition> FindInternal(OpcodeByte opcode, OpcodeByte ext1, OpcodeByte ext2)
{
return(from od in Defintions
where (ext1 == null && od.Ext1 == 0) || ext1 != null && od.Ext1 == ext1.Value
where (ext2 == null && od.Ext2 == 0) || ext2 != null && od.Ext2 == ext2.Value
where od.IsEqualTo(opcode)
select od);
}
public void AddParameter(OpcodeByte parameter)
{
_parameters.Add(parameter);
FormatText();
}
