public void Scramble(out InstructionGroups incGroups)
{
InstructionGroups instructionGroups = new InstructionGroups();
foreach (InstructionGroup item in this)
{
instructionGroups.Insert(InstructionGroups.r.Next(0, instructionGroups.Count), item);
}
incGroups = instructionGroups;
}
public static void processMethod1(MethodDef method)
{
method.Body.SimplifyBranches();
InstructionGroups instructionGroups = new InstructionGroups();
InstructionGroup instructionGroup = new InstructionGroup();
int num = 0;
int num2 = 0;
bool flag = false;
foreach (Instruction instruction in method.Body.Instructions)
{
int num3 = 0;
int num4;
instruction.CalculateStackUsage(out num4, out num3);
instructionGroup.Add(instruction);
num2 += num4 - num3;
if (num4 == 0 && instruction.OpCode != OpCodes.Nop && (num2 == 0 || instruction.OpCode == OpCodes.Ret))
{
if (!flag)
{
InstructionGroup instructionGroup2 = new InstructionGroup();
instructionGroup2.ID = num++;
instructionGroup2.nextGroup = instructionGroup2.ID + 1;
instructionGroups.Add(instructionGroup2);
instructionGroup2 = new InstructionGroup();
instructionGroup2.ID = num++;
instructionGroup2.nextGroup = instructionGroup2.ID + 1;
instructionGroups.Add(instructionGroup2);
flag = true;
}
instructionGroup.ID = num++;
instructionGroup.nextGroup = instructionGroup.ID + 1;
instructionGroups.Add(instructionGroup);
instructionGroup = new InstructionGroup();
}
}
if (instructionGroups.Count == 1)
{
return;
}
InstructionGroup last = instructionGroups.getLast();
instructionGroups.Scramble(out instructionGroups);
method.Body.Instructions.Clear();
Local local = new Local(controlflow.asm.CorLibTypes.Int32);
method.Body.Variables.Add(local);
Instruction instruction2 = Instruction.Create(OpCodes.Nop);
Instruction instruction3 = Instruction.Create(OpCodes.Br, instruction2);
method.Body.Instructions.Add(Instruction.Create(OpCodes.Ldc_I4_0));
method.Body.Instructions.Add(Instruction.Create(OpCodes.Stloc, local));
method.Body.Instructions.Add(Instruction.Create(OpCodes.Br, instruction3));
method.Body.Instructions.Add(instruction2);
foreach (InstructionGroup instructionGroup3 in instructionGroups)
{
if (instructionGroup3 != last)
{
method.Body.Instructions.Add(Instruction.Create(OpCodes.Ldloc, local));
method.Body.Instructions.Add(Instruction.Create(OpCodes.Ldc_I4, instructionGroup3.ID));
method.Body.Instructions.Add(Instruction.Create(OpCodes.Ceq));
Instruction instruction4 = Instruction.Create(OpCodes.Nop);
method.Body.Instructions.Add(Instruction.Create(OpCodes.Brfalse, instruction4));
foreach (Instruction item in instructionGroup3)
{
method.Body.Instructions.Add(item);
}
method.Body.Instructions.Add(Instruction.Create(OpCodes.Ldc_I4, instructionGroup3.nextGroup));
method.Body.Instructions.Add(Instruction.Create(OpCodes.Stloc, local));
method.Body.Instructions.Add(instruction4);
}
}
method.Body.Instructions.Add(Instruction.Create(OpCodes.Ldloc, local));
method.Body.Instructions.Add(Instruction.Create(OpCodes.Ldc_I4, instructionGroups.Count - 1));
method.Body.Instructions.Add(Instruction.Create(OpCodes.Ceq));
method.Body.Instructions.Add(Instruction.Create(OpCodes.Brfalse, instruction3));
method.Body.Instructions.Add(Instruction.Create(OpCodes.Br, last[0]));
method.Body.Instructions.Add(instruction3);
foreach (Instruction item2 in last)
{
method.Body.Instructions.Add(item2);
}
method.Body.OptimizeBranches();
method.Body.OptimizeMacros();
}