private IEnumerable <Group> GroupInstruction()
{
var body = this._Function.Body;
if (_Index >= body.Length)
{
yield break;
}
var instruction = body[_Index++];
IEnumerable <Group> enumerable;
var info = OpcodeInfo.Get(instruction.Op);
if (info.ChainCount >= 0)
{
enumerable = GroupBasicInstruction(info.ChainCount);
}
else if (instruction.Op == Opcode.Construct)
{
(var parameterCount, _) = ((byte, ClassDefinition))instruction.Argument;
enumerable = GroupBasicInstruction(parameterCount);
}
else if (instruction.Op == Opcode.Call)
{
(_, _, var functionType) = ((short, ushort, FunctionDefinition))instruction.Argument;
var parameterCount = functionType.Parameters == null
? 0
: functionType.Parameters.Length;
parameterCount++; // EndCall
enumerable = GroupBasicInstruction(parameterCount);
}
else if (instruction.Op == Opcode.Switch)
{
enumerable = GroupSwitchInstruction();
}
else if (instruction.Op == Opcode.SwitchCase)
{
enumerable = GroupSwitchCaseInstruction();
}
else if (instruction.Op == Opcode.SwitchDefault)
{
enumerable = GroupSwitchDefaultInstruction();
}
else
{
throw new NotImplementedException();
}
var group = new Group(instruction);
foreach (var child in enumerable)
{
group.Children.Add(child);
}
yield return(group);
}
private static unsafe delegate*<VirtualMachine, void> GetFunctionPointer(OpcodeInfo opcode, int mode)
{
if (opcode == null)
return null;
if (opcode.Emulators[mode] != null)
return (delegate*<VirtualMachine, void>)((IntPtr)typeof(Delegate).GetField("_methodPtrAux", System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.NonPublic).GetValue(opcode.Emulators[mode])).ToPointer();
return null;
}
public static DecodedOperands?TryDecode(OpcodeInfo opcode, ReadOnlySpan <byte> rawData, PrefixState prefixes)
{
try
{
return(Decode(opcode, rawData, prefixes, out _));
}
catch
{
return(null);
}
}
/// <summary>
/// Initializes a new instance of the Instruction class.
/// </summary>
/// <param name="opcodeInfo">Information about the instruction opcode.</param>
/// <param name="rawCodes">Machine code for the instruction.</param>
/// <param name="cs">Segment where instruction was decoded from.</param>
/// <param name="ip">Offset where instruction was decoded from.</param>
/// <param name="bigMode">Indicates whether the instruction should be decoded in big (32-bit) mode.</param>
internal Instruction(OpcodeInfo opcodeInfo, byte[] rawCodes, ushort cs, uint ip, bool bigMode)
{
if (opcodeInfo != null)
{
for (int i = 0; i < 12; i++)
{
this.operandCodes[i] = rawCodes[opcodeInfo.Length + i];
}
}
this.Opcode = opcodeInfo;
this.CS = cs;
this.offset = ip;
this.BigMode = bigMode;
}
/// <summary>
/// Assigns new values to the instruction instance.
/// </summary>
/// <param name="opcodeInfo">Information about the instruction opcode.</param>
/// <param name="rawCodes">Operand data starting with the first byte after the opcode.</param>
/// <param name="cs">Code segment of the instruction.</param>
/// <param name="ip">Offset in the current code segment of the instruction.</param>
/// <param name="bigMode">Indicates whether the instruction should be decoded in big (32-bit) mode.</param>
internal void Assign(OpcodeInfo opcodeInfo, IntPtr rawCodes, ushort cs, uint ip, bool bigMode)
{
unsafe
{
byte *ptr = (byte *)rawCodes.ToPointer();
for (int i = 0; i < this.operandCodes.Length; i++)
{
this.operandCodes[i] = ptr[i];
}
}
this.Opcode = opcodeInfo;
this.CS = cs;
this.offset = ip;
this.BigMode = bigMode;
this.formattedValue = null;
}
/// <summary>
/// Writes a start trace of the Dispatch method.
/// </summary>
/// <param name="opcode">The dispatched opcode.</param>
/// <param name="index">Optional dispatch paremeter.</param>
/// <param name="value">Optional dispatch paremeter.</param>
/// <param name="ptr">Optional dispatch paremeter.</param>
/// <param name="opt">Optional dispatch paremeter.</param>
/// <remarks>
/// The trace text is output as a <see cref="TraceEventType.Verbose"/> event type.
/// </remarks>
public void WriteDispatchBegin(int opcode, int index, IntPtr value, IntPtr ptr, float opt)
{
if (_traceSource.Switch.ShouldTrace(TraceEventType.Verbose))
{
string message = "Dispatch (Begin) ";
OpcodeInfo opcodeInfo = LookupOpcodeInfo(opcode);
if (opcodeInfo != null)
{
message += opcodeInfo.FormatArguments(index, value, ptr, opt);
}
else
{
message += String.Format("Opcode={0} Index={1}, Value={2} Ptr={3} Opt={4}.", opcode, index, value, ptr, opt);
}
WriteEvent(TraceEventType.Verbose, message);
}
}
internal void Assign(OpcodeInfo opcodeInfo, IntPtr rawCodes, Processor processor, uint ip)
{
base.Assign(opcodeInfo, rawCodes, processor.CS, ip, processor.GlobalSize != 0);
this.EAX = (uint)processor.EAX;
this.EBX = (uint)processor.EBX;
this.ECX = (uint)processor.ECX;
this.EDX = (uint)processor.EDX;
this.ESI = processor.ESI;
this.EDI = processor.EDI;
this.EBP = processor.EBP;
this.DS = processor.DS;
this.ES = processor.ES;
this.FS = processor.FS;
this.GS = processor.GS;
this.SS = processor.SS;
this.ESP = processor.ESP;
this.Flags = processor.Flags.Value & ~EFlags.Reserved1;
this.CR0 = processor.CR0;
}
internal static void Initialize()
{
var isb = new InstructionSetBuilder();
isb.BuildSet();
foreach (var info in isb.OneByteOpcodes)
oneByteCodes[info.Opcode] = new OpcodeInfo(info);
foreach (var info in isb.TwoByteOpcodes)
{
int byte1 = info.Opcode & 0xFF;
int byte2 = (info.Opcode >> 8) & 0xFF;
if (info.ModRmByte != ModRmInfo.OnlyRm)
{
if (twoByteCodes[byte1] == null)
twoByteCodes[byte1] = new OpcodeInfo[256];
twoByteCodes[byte1][byte2] = new OpcodeInfo(info);
}
else
{
if (twoByteRmCodes[byte1] == null)
twoByteRmCodes[byte1] = new OpcodeInfo[256][];
if (twoByteRmCodes[byte1][byte2] == null)
twoByteRmCodes[byte1][byte2] = new OpcodeInfo[8];
twoByteRmCodes[byte1][byte2][info.ExtendedRmOpcode] = new OpcodeInfo(info);
}
}
foreach (var info in isb.ExtendedOpcodes)
{
if (rmCodes[info.Opcode] == null)
rmCodes[info.Opcode] = new OpcodeInfo[8];
rmCodes[info.Opcode][info.ExtendedRmOpcode] = new OpcodeInfo(info);
}
allCodes = new OpcodeCollection();
InitializeNativeArrays();
}
public static DecodedOperands Decode(OpcodeInfo opcode, ReadOnlySpan <byte> rawData, PrefixState prefixes) => Decode(opcode, rawData, prefixes, out _);
private static DecodedOperands Decode(OpcodeInfo opcode, ReadOnlySpan <byte> rawData, PrefixState prefixes, out int length)
{
var reader = new OperandReader(rawData);
var operands = new DecodedOperands();
length = 0;
if (opcode.Operands.Count == 0)
{
return(operands);
}
if (opcode.ModRmInfo != ModRmInfo.None)
{
byte modRmByte = reader.ReadByte();
int mod = (modRmByte & 0xC0) >> 6;
int rm = modRmByte & 0x07;
for (int i = 0; i < opcode.Operands.Count; i++)
{
var type = opcode.Operands[i];
if (type == OperandType.RegisterOrMemoryByte)
{
operands.SetOperand(i, DecodeRmbw(mod, rm, true, prefixes, ref reader));
}
else if (IsPointerOperand(type))
{
var operand = DecodeRmbw(mod, rm, false, prefixes, ref reader);
if (type == OperandType.EffectiveAddress)
{
operand.Type = CodeOperandType.EffectiveAddress;
}
else if (type == OperandType.FullLinearAddress)
{
operand.Type = CodeOperandType.FullLinearAddress;
}
else if (type == OperandType.RegisterOrMemoryWordNearPointer)
{
operand.Type = CodeOperandType.AbsoluteJumpAddress;
}
else if (type == OperandType.IndirectFarPointer)
{
operand.Type = CodeOperandType.IndirectFarMemoryAddress;
}
else if (type == OperandType.MemoryInt16 || type == OperandType.RegisterOrMemory16)
{
operand.OperandSize = CodeOperandSize.Word;
}
else if (type == OperandType.MemoryInt32 || type == OperandType.RegisterOrMemory32)
{
operand.OperandSize = CodeOperandSize.DoubleWord;
}
else if (type == OperandType.MemoryInt64)
{
operand.OperandSize = CodeOperandSize.QuadWord;
}
else if (type == OperandType.MemoryFloat32)
{
operand.OperandSize = CodeOperandSize.Single;
}
else if (type == OperandType.MemoryFloat64)
{
operand.OperandSize = CodeOperandSize.Double;
}
else if (type == OperandType.MemoryFloat80)
{
operand.OperandSize = CodeOperandSize.LongDouble;
}
operands.SetOperand(i, operand);
}
}
if (opcode.ModRmInfo == ModRmInfo.All)
{
int reg = (modRmByte & 0x38) >> 3;
for (int i = 0; i < opcode.Operands.Count; i++)
{
var type = opcode.Operands[i];
if (type == OperandType.RegisterByte)
{
operands.SetOperand(i, DecodeRb(reg));
}
else if (type == OperandType.RegisterWord)
{
operands.SetOperand(i, DecodeRw(reg, prefixes));
}
else if (type == OperandType.SegmentRegister)
{
operands.SetOperand(i, DecodeSreg(reg));
}
}
}
}
for (int i = 0; i < opcode.Operands.Count; i++)
{
var type = opcode.Operands[i];
if (IsKnownRegister(type))
{
operands.SetOperand(i, new CodeOperand(DecodeKnownRegister(type, (prefixes & PrefixState.OperandSize) != 0)));
}
else if (type == OperandType.ImmediateByte)
{
operands.SetOperand(i, new CodeOperand(CodeOperandType.Immediate, reader.ReadByte(), CodeOperandSize.Byte));
}
else if (type == OperandType.ImmediateByteExtend || type == OperandType.ImmediateRelativeByte)
{
var operand = new CodeOperand(CodeOperandType.Immediate, (uint)(int)reader.ReadSByte(), GetOperandSize(false, prefixes));
if (type == OperandType.ImmediateRelativeByte)
{
operand.Type = CodeOperandType.RelativeJumpAddress;
}
operands.SetOperand(i, operand);
}
else if (type == OperandType.ImmediateInt16)
{
operands.SetOperand(i, new CodeOperand(CodeOperandType.Immediate, reader.ReadUInt16(), CodeOperandSize.Word));
}
else if (type == OperandType.ImmediateInt32)
{
operands.SetOperand(i, new CodeOperand(CodeOperandType.Immediate, reader.ReadUInt32(), CodeOperandSize.DoubleWord));
}
else if (type == OperandType.ImmediateWord)
{
uint value;
if ((prefixes & PrefixState.OperandSize) == 0)
{
value = reader.ReadUInt16();
}
else
{
value = reader.ReadUInt32();
}
operands.SetOperand(i, new CodeOperand(CodeOperandType.Immediate, value, GetOperandSize(false, prefixes)));
}
else if (type == OperandType.ImmediateRelativeWord)
{
uint value;
if ((prefixes & PrefixState.OperandSize) == 0)
{
value = (uint)(int)reader.ReadInt16();
}
else
{
value = reader.ReadUInt32();
}
operands.SetOperand(i, new CodeOperand(CodeOperandType.RelativeJumpAddress, value, GetOperandSize(false, prefixes)));
}
else if (type == OperandType.MemoryOffsetByte || type == OperandType.MemoryOffsetWord)
{
uint value;
if ((prefixes & PrefixState.AddressSize) == 0)
{
value = (uint)(int)reader.ReadInt16();
}
else
{
value = reader.ReadUInt32();
}
operands.SetOperand(i, new CodeOperand(CodeMemoryBase.DisplacementOnly, value, GetOperandSize(type == OperandType.MemoryOffsetByte, prefixes)));
}
else if (type == OperandType.ImmediateFarPointer)
{
uint value;
if ((prefixes & PrefixState.AddressSize) == 0)
{
value = reader.ReadUInt16();
}
else
{
value = reader.ReadUInt32();
}
ushort segment = reader.ReadUInt16();
operands.SetOperand(i, CodeOperand.FarPointer(segment, value));
}
}
length = reader.Position;
return(operands);
}
public static int CalculateOperandLength(OpcodeInfo opcode, ReadOnlySpan <byte> rawData, PrefixState prefixes)
{
Decode(opcode, rawData, prefixes, out int length);
return(length);
}
private Instruction MakeInstruction(int offset, OpcodeInfo opcodeInfo, ushort extraData)
{
Operand operand1, operand2;
// Handle simple instructions
if (opcodeInfo.FirstOperand == DisassemblyOperand.None)
{
switch (opcodeInfo.Operation)
{
case Operation.Nop: return(new ControlInstruction(offset, ControlInstructionType.NoOperation));
case Operation.Stop: return(new ControlInstruction(offset, ControlInstructionType.Stop));
case Operation.Halt: return(new ControlInstruction(offset, ControlInstructionType.Halt));
case Operation.Di: return(new ControlInstruction(offset, ControlInstructionType.DisableInterrupts));
case Operation.Ei: return(new ControlInstruction(offset, ControlInstructionType.EnableInterrupts));
case Operation.Ret: return(new ReturnInstruction(offset));
case Operation.Reti: return(new ReturnInstruction(offset, true));
case Operation.Rlca: return(new ShiftInstruction(offset, ShiftInstructionFlags.RotateRightCircular, Operand.DirectA));
case Operation.Rrca: return(new ShiftInstruction(offset, ShiftInstructionFlags.RotateLeftCircular, Operand.DirectA));
case Operation.Rla: return(new ShiftInstruction(offset, ShiftInstructionFlags.RotateRight, Operand.DirectA));
case Operation.Rra: return(new ShiftInstruction(offset, ShiftInstructionFlags.RotateLeft, Operand.DirectA));
case Operation.Daa: return(new UtilityInstruction(offset, UtilityOperation.DecimalAdjustAfter));
case Operation.Cpl: return(new UtilityInstruction(offset, UtilityOperation.DecimalAdjustAfter));
case Operation.Scf: return(new UtilityInstruction(offset, UtilityOperation.DecimalAdjustAfter));
case Operation.Ccf: return(new UtilityInstruction(offset, UtilityOperation.DecimalAdjustAfter));
default: throw new NotImplementedException() /*return new ControlInstruction(offset, ControlInstructionType.NoOperation)*/;
}
}
// Handle jump instructions (and the conditional return instruction too)
else if (opcodeInfo.Operation == Operation.Jp ||
opcodeInfo.Operation == Operation.Jr ||
opcodeInfo.Operation == Operation.Call ||
opcodeInfo.Operation == Operation.Rst ||
opcodeInfo.Operation == Operation.Ret)
{
Label label;
JumpType jumpType;
Condition condition;
ushort mappedOffset, destination;
switch (opcodeInfo.FirstOperand)
{
case DisassemblyOperand.NotZero: condition = Condition.NotZero; break;
case DisassemblyOperand.Zero: condition = Condition.Zero; break;
case DisassemblyOperand.NotCarry: condition = Condition.CarryClear; break;
case DisassemblyOperand.Carry: condition = Condition.CarrySet; break;
default: condition = Condition.Always; break;
}
switch (opcodeInfo.Operation)
{
case Operation.Ret: return(new ReturnInstruction(offset, condition));
case Operation.Jr: jumpType = JumpType.Relative; break;
case Operation.Jp: jumpType = JumpType.Absolute; break;
default: jumpType = JumpType.FunctionCall; break;
}
if (offset < 0x8000)
{
mappedOffset = (ushort)offset;
}
else
{
mappedOffset = (ushort)(0x4000 | (offset & 0x3FFF));
}
if (opcodeInfo.Operation == Operation.Rst)
{
destination = opcodeInfo.EmbeddedValue;
}
else if (opcodeInfo.Operation == Operation.Jr)
{
unchecked { destination = (ushort)(mappedOffset + 2 + (sbyte)(byte)extraData); } // Add 2 to the offset because of the jump instruction length
}
else
{
destination = extraData;
}
if (destination >= 0x8000 || (IsRomBanked && destination >= 0x4000 && mappedOffset < 0x4000))
{
return(new JumpInstruction(offset, jumpType, condition, extraData));
}
else if (jumpType == JumpType.FunctionCall)
{
label = DefineFunctionLabel((offset & ~0x3FFF) | destination);
}
else
{
label = DefineLabel((offset & ~0x3FFF) | destination);
}
return(new ResolvedJumpInstruction(offset, jumpType, condition, destination, label));
}
// Handle single-operand instructions
else if (opcodeInfo.SecondOperand == DisassemblyOperand.None)
{
operand1 = MakeOperand(opcodeInfo.FirstOperand, opcodeInfo.EmbeddedValue, extraData);
switch (opcodeInfo.Operation)
{
case Operation.Inc: return(new ArithmeticInstruction(offset, ArithmeticOperation.Add, operand1, new Operand <byte>(1)));
case Operation.Dec: return(new ArithmeticInstruction(offset, ArithmeticOperation.Substract, operand1, new Operand <byte>(1)));
case Operation.Pop: return(new PopInstruction(offset, operand1));
case Operation.Push: return(new PushInstruction(offset, operand1));
case Operation.Rlc: return(new ShiftInstruction(offset, ShiftInstructionFlags.RotateRightCircular, operand1));
case Operation.Rrc: return(new ShiftInstruction(offset, ShiftInstructionFlags.RotateLeftCircular, operand1));
case Operation.Rl: return(new ShiftInstruction(offset, ShiftInstructionFlags.RotateRight, operand1));
case Operation.Rr: return(new ShiftInstruction(offset, ShiftInstructionFlags.RotateLeft, operand1));
case Operation.Sla: return(new ShiftInstruction(offset, ShiftInstructionFlags.ShiftLeftArithmetical, operand1));
case Operation.Sra: return(new ShiftInstruction(offset, ShiftInstructionFlags.ShiftRightArithmetical, operand1));
case Operation.Srl: return(new ShiftInstruction(offset, ShiftInstructionFlags.ShiftRightLogical, operand1));
case Operation.Swap: return(new SwapInstruction(offset, operand1));
default: throw new InvalidOperationException();
}
}
// Handle remaining instructions
else
{
operand1 = MakeOperand(opcodeInfo.FirstOperand, opcodeInfo.EmbeddedValue, extraData);
operand2 = MakeOperand(opcodeInfo.SecondOperand, opcodeInfo.EmbeddedValue, extraData);
switch (opcodeInfo.Operation)
{
case Operation.Ld: return(new LoadInstruction(offset, operand1, operand2));
case Operation.Ldi: return(new LoadInstruction(offset, LoadOperationType.IncrementHl, operand1, operand2));
case Operation.Ldd: return(new LoadInstruction(offset, LoadOperationType.DecrementHl, operand1, operand2));
case Operation.Add: return(new ArithmeticInstruction(offset, ArithmeticOperation.Add, operand1, operand2));
case Operation.Adc: return(new ArithmeticInstruction(offset, ArithmeticOperation.AddWithCarry, operand1, operand2));
case Operation.Sub: return(new ArithmeticInstruction(offset, ArithmeticOperation.Substract, operand1, operand2));
case Operation.Sbc: return(new ArithmeticInstruction(offset, ArithmeticOperation.SubstractWithCarry, operand1, operand2));
case Operation.And: return(new ArithmeticInstruction(offset, ArithmeticOperation.And, operand1, operand2));
case Operation.Xor: return(new ArithmeticInstruction(offset, ArithmeticOperation.Xor, operand1, operand2));
case Operation.Or: return(new ArithmeticInstruction(offset, ArithmeticOperation.Or, operand1, operand2));
case Operation.Cp: return(new ArithmeticInstruction(offset, ArithmeticOperation.Compare, operand1, operand2));
case Operation.Bit: return(new BitInstruction(offset, BitOperation.Test, operand1, operand2));
case Operation.Set: return(new BitInstruction(offset, BitOperation.Set, operand1, operand2));
case Operation.Res: return(new BitInstruction(offset, BitOperation.Clear, operand1, operand2));
default: throw new InvalidOperationException();
}
}
}
public void read(Reader reader)
{
foreach (ScriptSub sub in subs)
{
sub.scriptCode.Clear();
sub.blankLines.Clear();
sub.labels.Clear();
sub.jumpTable.Clear();
bool finishedScriptCode = false;
int scriptCodeLength = reader.ReadByte() << 8;
scriptCodeLength |= reader.ReadByte();
sub.scriptCode.Clear();
while (!finishedScriptCode)
{
byte scriptOpcode = reader.ReadByte();
if (scriptOpcode == 0xFF)
{
scriptOpcode = reader.ReadByte();
if (scriptOpcode == 0xFF)
{
scriptOpcode = reader.ReadByte();
if (scriptOpcode == 0xFF)
{
scriptOpcode = reader.ReadByte();
if (scriptOpcode == 0xFF)
{
finishedScriptCode = true;
}
}
}
}
if (!finishedScriptCode)
{
OpcodeInfo opInfo = new OpcodeInfo();
opInfo.opcode = scriptOpcode;
uint paramCount = (uint)opcodeList[scriptOpcode].paramCount;
opInfo.parameters.Clear();
for (int p = 0; p < paramCount; p++)
{
ParamInfo param = new ParamInfo();
int paramType = reader.ReadByte(); // if 0 then int constant, else variable
if (paramType != 0)
{
param.isVariable = true;
param.value = reader.ReadByte();
int arrayIndex = reader.ReadByte();
if (arrayIndex > 0x80)
{
arrayIndex = 0x80 - arrayIndex;
}
param.arrayIndex = (sbyte)arrayIndex;
}
else
{
param.isVariable = false;
param.arrayIndex = -1;
int byte1 = reader.ReadByte();
int constVal = 0;
if (byte1 < 0x80) // unsigned uint16
{
constVal = byte1 << 8;
constVal |= reader.ReadByte();
}
else // signed uint16
{
constVal = (byte1 - 0x80) << 8;
constVal |= reader.ReadByte();
constVal = -constVal;
}
param.value = constVal;
}
opInfo.parameters.Add(param);
}
sub.scriptCode.Add(opInfo);
}
}
int blankLineUnused = reader.ReadByte();
int blankLineCount = reader.ReadByte();
for (int u = 0; u < blankLineCount; u++)
{
int blankLineID = reader.ReadByte() << 8;
blankLineID |= reader.ReadByte();
sub.blankLines.Add(blankLineID);
}
int labelUnused = reader.ReadByte();
int labelCount = reader.ReadByte();
for (int l = 0; l < labelCount; l++)
{
LabelInfo label = new LabelInfo();
label.scriptCodePos = reader.ReadByte() << 8;
label.scriptCodePos |= reader.ReadByte();
label.id = reader.ReadByte() << 8;
label.id |= reader.ReadByte();
label.lineID = reader.ReadByte() << 8;
label.lineID |= reader.ReadByte();
sub.labels.Add(label);
}
int jumpTableUnused = reader.ReadByte();
int jumpTableCount = reader.ReadByte();
for (int s = 0; s < jumpTableCount; ++s)
{
SwitchInfo info = new SwitchInfo();
info.scriptCodePos = reader.ReadByte() << 8;
info.scriptCodePos |= reader.ReadByte();
int caseCount = reader.ReadByte() << 8;
caseCount |= reader.ReadByte();
info.defaultScriptCodePos = reader.ReadByte() << 8;
info.defaultScriptCodePos |= reader.ReadByte();
info.defaultCaseLineID = reader.ReadByte() << 8;
info.defaultCaseLineID |= reader.ReadByte();
info.endScriptCodePos = reader.ReadByte() << 8;
info.endScriptCodePos |= reader.ReadByte();
// if (info.defaultScriptCodePos == 0)
// info.defaultScriptCodePos = info.endScriptCodePos;
int lowestCase = 0x8000;
int highestCase = 0;
info.cases.Clear();
for (int c = 0; c < caseCount; c++)
{
SwitchCaseInfo caseInfo = new SwitchCaseInfo();
caseInfo.scriptCodePos = reader.ReadByte() << 8;
caseInfo.scriptCodePos |= reader.ReadByte();
caseInfo.caseNum = reader.ReadByte() << 8;
caseInfo.caseNum |= reader.ReadByte();
if (caseInfo.caseNum < lowestCase)
{
lowestCase = caseInfo.caseNum;
}
if (caseInfo.caseNum > highestCase)
{
highestCase = caseInfo.caseNum;
}
caseInfo.lineID = reader.ReadByte() << 8;
caseInfo.lineID |= reader.ReadByte();
info.cases.Add(caseInfo);
}
info.lowestCase = lowestCase;
info.highestCase = highestCase;
// Take any duds and make em default cases
// for (int m = lowestCase; m <= highestCase; ++m)
// {
// int jump = sub.scriptCode[caseTablePos + m];
// if (jump == 0)
// sub.scriptCode[caseTablePos + m] = sub.jumpTable[startSwitchTablePos + 2];
// }
// wow this is weird
// it manually goes and sets up the offsets instead of doing it at compile-time like later RSDK versions
int pos = 0;
foreach (OpcodeInfo opcodeInfo in sub.scriptCode)
{
if (pos == info.scriptCodePos)
{
opcodeInfo.parameters[1].value = pos;
break;
}
pos += opcodeInfo.size;
}
sub.jumpTable.Add(info);
}
}
reader.Close();
}
public Instruction(TokenStream tokenStream, OpcodeInfo opcode) : base(tokenStream)
{
this.opcode = opcode;
}
private IEnumerable <Group> GroupInstruction()
{
var body = this._Function.Body;
if (_Index >= body.Count)
{
yield break;
}
var instruction = body[_Index++];
IEnumerable <Group> enumerable;
var info = OpcodeInfo.Get(instruction.Op);
if (info.ChainCount >= 0)
{
enumerable = GroupBasicInstruction(info.ChainCount);
}
else if (instruction.Op == Opcode.Constructor)
{
var(parameterCount, _) = (Constructor)instruction.Argument;
enumerable = GroupBasicInstruction(parameterCount);
}
else if (instruction.Op == Opcode.FinalFunc)
{
var(_, _, function) = (FinalFunc)instruction.Argument;
var parameterCount = function.Parameters.Count;
parameterCount++; // EndCall
enumerable = GroupBasicInstruction(parameterCount);
}
else if (instruction.Op == Opcode.VirtualFunc)
{
// TODO(gibbed): dodgy af
/*var (_, _, name) = ((short, ushort, string))instruction.Argument;
* var candidates = this._Cache.Definitions.Where(d => d.Name == name).ToArray();
* if (candidates.Length != 1)
* {
* enumerable = GroupBasicInstruction(1);
* }
* else
* {
* var function = (FunctionDefinition)candidates[0];
* var parameterCount = function.Parameters.Count;
* parameterCount++; // EndCall
* enumerable = GroupBasicInstruction(parameterCount);
* }*/
enumerable = GroupCallNameInstruction();
}
else if (instruction.Op == Opcode.Switch)
{
enumerable = GroupSwitchInstruction();
}
else if (instruction.Op == Opcode.SwitchLabel)
{
enumerable = GroupSwitchCaseInstruction();
}
else if (instruction.Op == Opcode.SwitchDefault)
{
enumerable = GroupSwitchDefaultInstruction();
}
else
{
throw new NotImplementedException();
}
var group = new Group(instruction);
foreach (var child in enumerable)
{
group.Children.Add(child);
}
yield return(group);
}
private static Exception GetPartiallyNotImplementedException(VirtualMachine vm, OpcodeInfo info) => new NotImplementedException($"Instruction '{info.Name}' not implemented for {vm.Processor.AddressSize}-bit addressing, {vm.Processor.OperandSize}-bit operand size.");
