bool VerifyValidArgs(Instruction instr)
{
int pushes, pops;
instr.CalculateStackUsage(out pushes, out pops);
if (pops < 0)
{
return(false);
}
bool retVal;
Value val2, val1;
switch (pops)
{
case 0:
return(true);
case 1:
val1 = instructionEmulator.Pop();
retVal = VerifyValidArg(val1);
instructionEmulator.Push(val1);
return(retVal);
case 2:
val2 = instructionEmulator.Pop();
val1 = instructionEmulator.Pop();
retVal = VerifyValidArg(val2) && VerifyValidArg(val1);
instructionEmulator.Push(val1);
instructionEmulator.Push(val2);
return(retVal);
}
return(false);
}
bool FindInts(int index) {
if (index < 0)
return false;
i2 = 0;
var instrs = stringMethod.Body.Instructions;
var emu = new InstructionEmulator(stringMethod);
foreach (var kv in stringMethodConsts.Locals32)
emu.SetLocal(kv.Key, new Int32Value(kv.Value));
var fields = new Dictionary<FieldDef, int?>();
for (int i = index; i < instrs.Count - 2; i++) {
var instr = instrs[i];
FieldDef field;
switch (instr.OpCode.Code) {
case Code.Ldsfld:
field = instr.Operand as FieldDef;
if (field == null || field.DeclaringType != stringMethod.DeclaringType || field.FieldType.GetElementType() != ElementType.I4)
goto default;
fields[field] = null;
emu.Push(new Int32Value(i1));
break;
case Code.Stsfld:
field = instr.Operand as FieldDef;
if (field == null || field.DeclaringType != stringMethod.DeclaringType || field.FieldType.GetElementType() != ElementType.I4)
goto default;
if (fields.ContainsKey(field) && fields[field] == null)
goto default;
var val = emu.Pop() as Int32Value;
if (val == null || !val.AllBitsValid())
fields[field] = null;
else
fields[field] = val.Value;
break;
case Code.Call:
var method = instr.Operand as MethodDef;
if (!decrypterType.Detected || method != decrypterType.Int64Method)
goto done;
emu.Push(new Int64Value((long)decrypterType.GetMagic()));
break;
case Code.Newobj:
if (!EmulateDynocode(emu, ref i))
goto default;
break;
default:
if (instr.OpCode.FlowControl != FlowControl.Next)
goto done;
emu.Emulate(instr);
break;
}
}
done:
foreach (var val in fields.Values) {
if (val == null)
continue;
magic1 = i2 = val.Value;
return true;
}
return false;
}
// 5.1+
// the only changes are the indexes of ldloc and stfld
bool EmulateDynocodeNew(InstructionEmulator emu, ref int index) {
var instrs = stringMethod.Body.Instructions;
var instr = instrs[index];
var ctor = instr.Operand as MethodDef;
if (ctor == null || ctor.MethodSig.GetParamCount() != 1 || ctor.MethodSig.Params[0].ElementType != ElementType.I4)
return false;
if (index + 4 >= instrs.Count)
return false;
var ldloc = instrs[index + 2];
var stfld = instrs[index + 3];
if (!ldloc.IsLdloc() || stfld.OpCode.Code != Code.Stfld)
return false;
var enumerableField = stfld.Operand as FieldDef;
if (enumerableField == null)
return false;
var initValue = emu.GetLocal(ldloc.GetLocal(stringMethod.Body.Variables)) as Int32Value;
if (initValue == null || !initValue.AllBitsValid())
return false;
int leaveIndex = FindLeave(instrs, index);
if (leaveIndex < 0)
return false;
var afterLoop = instrs[leaveIndex].Operand as Instruction;
if (afterLoop == null)
return false;
int newIndex = instrs.IndexOf(afterLoop);
var loopLocal = GetDCLoopLocal(index, newIndex);
if (loopLocal == null)
return false;
var initValue2 = emu.GetLocal(loopLocal) as Int32Value;
if (initValue2 == null || !initValue2.AllBitsValid())
return false;
int loopStart = GetIndexOfCall(instrs, index, leaveIndex, "System.Int32", "()");
int loopEnd = GetIndexOfCall(instrs, loopStart, leaveIndex, "System.Boolean", "()");
if (loopStart < 0 || loopEnd < 0)
return false;
loopStart++;
loopEnd--;
dynocode.Initialize(module);
var ctorArg = emu.Pop() as Int32Value;
if (ctorArg == null || !ctorArg.AllBitsValid())
return false;
dynocode.CreateEnumerable(ctor, new object[] { ctorArg.Value });
dynocode.WriteEnumerableField(enumerableField.MDToken.ToUInt32(), initValue.Value);
dynocode.CreateEnumerator();
foreach (var val in dynocode) {
emu.Push(new Int32Value(val));
for (int i = loopStart; i < loopEnd; i++)
emu.Emulate(instrs[i]);
}
index = newIndex - 1;
return true;
}
public static Value[] GetInitializedArray(int arraySize, MethodDef method, ref int newarrIndex, Code stelemOpCode) {
var resultValueArray = new Value[arraySize];
var emulator = new InstructionEmulator(method);
var theArray = new UnknownValue();
emulator.Push(theArray);
var instructions = method.Body.Instructions;
int i;
for (i = newarrIndex + 1; i < instructions.Count; i++) {
var instr = instructions[i];
if (instr.OpCode.FlowControl != FlowControl.Next)
break;
if (instr.OpCode.Code == Code.Newarr)
break;
switch (instr.OpCode.Code) {
case Code.Newarr:
case Code.Newobj:
goto done;
case Code.Stloc:
case Code.Stloc_S:
case Code.Stloc_0:
case Code.Stloc_1:
case Code.Stloc_2:
case Code.Stloc_3:
case Code.Starg:
case Code.Starg_S:
case Code.Stsfld:
case Code.Stfld:
if (emulator.Peek() == theArray && i != newarrIndex + 1 && i != newarrIndex + 2)
goto done;
break;
}
if (instr.OpCode.Code == stelemOpCode) {
var value = emulator.Pop();
var index = emulator.Pop() as Int32Value;
var array = emulator.Pop();
if (ReferenceEquals(array, theArray) && index != null && index.AllBitsValid()) {
if (0 <= index.Value && index.Value < resultValueArray.Length)
resultValueArray[index.Value] = value;
}
}
else
emulator.Emulate(instr);
}
done:
if (i != newarrIndex + 1)
i--;
newarrIndex = i;
return resultValueArray;
}