private void Obfuscate(ILInstruction instruction)
{
if (instruction.OpCode != OpCodes.Ldstr)
{
return;
}
int index = AddString((string)instruction.Value);
instruction.OpCode = OpCodes.Ldsfld;
instruction.Value = _stringFieldRef;
var next = new ILInstruction(Instruction.GetLdc(index));
instruction.AddNext(next);
instruction = next;
next = new ILInstruction(OpCodes.Ldelem_Ref);
instruction.AddNext(next);
}
private bool Build(ILInstruction instruction)
{
var methodRef = instruction.Value as MethodReference;
if (methodRef == null)
{
return(false);
}
var opCode = instruction.OpCode;
if (opCode != OpCodes.Call && opCode != OpCodes.Callvirt)
{
return(false);
}
if (methodRef.HasThis ||
methodRef.CallConv != MethodCallingConvention.Default)
{
return(false);
}
int methodIndex;
_methodRefs.TryAdd(methodRef, out methodIndex);
instruction.OpCode = OpCodes.Ldsfld;
instruction.Value =
new FieldReference(
"MethodPointers",
new ArrayType(
TypeReference.GetPrimitiveType(PrimitiveTypeCode.IntPtr, _module.Assembly)),
new TypeReference(_mainType.Name, _mainType.Namespace, false));
instruction = instruction.AddNext(Instruction.GetLdc(methodIndex));
instruction = instruction.AddNext(OpCodes.Ldelem_I);
instruction = instruction.AddNext(OpCodes.Calli, methodRef.CallSite);
return(true);
}