public static DebugOperand Parse(DebugBytecodeReader reader, OpcodeType parentType)
{
uint token0 = reader.ReadUInt32("operandToken");
if (token0 == 0)
{
return(null);
}
var member = reader.LocalMembers.Last();
var operand = new DebugOperand(parentType);
var numComponents = token0.DecodeValue <OperandNumComponents>(0, 1);
reader.AddNote("numComponents", numComponents);
switch (numComponents)
{
case OperandNumComponents.Zero:
{
operand.NumComponents = 0;
break;
}
case OperandNumComponents.One:
{
operand.NumComponents = 1;
break;
}
case OperandNumComponents.Four:
{
operand.NumComponents = 4;
operand.SelectionMode = token0.DecodeValue <Operand4ComponentSelectionMode>(2, 3);
member.AddNote("SelectionMode", operand.SelectionMode);
switch (operand.SelectionMode)
{
case Operand4ComponentSelectionMode.Mask:
{
operand.ComponentMask = token0.DecodeValue <ComponentMask>(4, 7);
member.AddNote("ComponentMask", operand.ComponentMask);
break;
}
case Operand4ComponentSelectionMode.Swizzle:
{
var swizzle = token0.DecodeValue(4, 11);
Func <uint, byte, Operand4ComponentName> swizzleDecoder = (s, i) =>
(Operand4ComponentName)((s >> (i * 2)) & 3);
operand.Swizzles[0] = swizzleDecoder(swizzle, 0);
operand.Swizzles[1] = swizzleDecoder(swizzle, 1);
operand.Swizzles[2] = swizzleDecoder(swizzle, 2);
operand.Swizzles[3] = swizzleDecoder(swizzle, 3);
member.AddNote("Swizzles[0]", operand.Swizzles[0]);
member.AddNote("Swizzles[1]", operand.Swizzles[1]);
member.AddNote("Swizzles[2]", operand.Swizzles[2]);
member.AddNote("Swizzles[3]", operand.Swizzles[3]);
break;
}
case Operand4ComponentSelectionMode.Select1:
{
var swizzle = token0.DecodeValue <Operand4ComponentName>(4, 5);
operand.Swizzles[0] = operand.Swizzles[1] = operand.Swizzles[2] = operand.Swizzles[3] = swizzle;
member.AddNote("Swizzles[0]", operand.Swizzles[0]);
member.AddNote("Swizzles[1]", operand.Swizzles[1]);
member.AddNote("Swizzles[2]", operand.Swizzles[2]);
member.AddNote("Swizzles[3]", operand.Swizzles[3]);
break;
}
default:
{
throw new ParseException("Unrecognized selection method: " + operand.SelectionMode);
}
}
break;
}
case OperandNumComponents.N:
{
throw new ParseException("OperandNumComponents.N is not currently supported.");
}
}
operand.OperandType = token0.DecodeValue <OperandType>(12, 19);
member.AddNote("OperandType", operand.OperandType);
operand.IndexDimension = token0.DecodeValue <OperandIndexDimension>(20, 21);
member.AddNote("IndexDimension", operand.IndexDimension);
operand.IsExtended = token0.DecodeValue(31, 31) == 1;
member.AddNote("IsExtended", operand.IsExtended);
if (operand.IsExtended)
{
ReadExtendedOperand(operand, reader);
}
Func <uint, byte, OperandIndexRepresentation> indexRepresentationDecoder = (t, i) =>
(OperandIndexRepresentation)t.DecodeValue((byte)(22 + (i * 3)), (byte)(22 + (i * 3) + 2));
for (byte i = 0; i < (byte)operand.IndexDimension; i++)
{
operand.Indices[i] = new DebugOperandIndex();
var indexRepresentation = indexRepresentationDecoder(token0, i);
operand.Indices[i].Representation = indexRepresentation;
member.AddNote($"Indices[{i}].Representation", operand.Indices[i].Representation);
switch (indexRepresentation)
{
case OperandIndexRepresentation.Immediate32:
operand.Indices[i].Value = reader.ReadUInt32($"Indices[{i}].Value");
break;
case OperandIndexRepresentation.Immediate64:
operand.Indices[i].Value = reader.ReadUInt64($"Indices[{i}].Value");
goto default;
case OperandIndexRepresentation.Relative:
operand.Indices[i].Register = Parse(reader, parentType);
break;
case OperandIndexRepresentation.Immediate32PlusRelative:
operand.Indices[i].Value = reader.ReadUInt32($"Indices[{i}].Value");
goto case OperandIndexRepresentation.Relative;
case OperandIndexRepresentation.Immediate64PlusRelative:
operand.Indices[i].Value = reader.ReadUInt64($"Indices[{i}].Value");
goto case OperandIndexRepresentation.Relative;
default:
throw new ParseException("Unrecognised index representation: " + indexRepresentation);
}
}
var numberType = parentType.GetNumberType();
switch (operand.OperandType)
{
case OperandType.Immediate32:
{
var immediateValues = new DebugNumber4();
for (var i = 0; i < operand.NumComponents; i++)
{
immediateValues.SetNumber(i, DebugNumber.Parse(reader));
}
operand.ImmediateValues = immediateValues;
break;
}
case OperandType.Immediate64:
{
var immediateValues = new DebugNumber4();
for (var i = 0; i < operand.NumComponents; i++)
{
immediateValues.SetDouble(i, reader.ReadDouble($"ImmediateValues[{i}]"));
}
operand.ImmediateValues = immediateValues;
break;
}
}
return(operand);
}
