public override void Mangle(ICFMangleContext context, Block.Regular block)
{
var fragments = context.SplitFragments(block);
if (fragments.Count < 4)
{
return;
}
var current = fragments.First;
while (current.Next != null)
{
var newFragment = new CilFragment(current.Value);
context.AddJump(newFragment, current.Next.Value.First, true);
current.Value = newFragment;
current = current.Next;
}
var first = fragments.First.Value;
fragments.RemoveFirst();
var last = fragments.Last.Value;
fragments.RemoveLast();
var newFragments = fragments.ToList();
newFragments.Shuffle(Mangler.Rng);
block.Fragment.Reset(first
.Concat(newFragments.SelectMany(fragment => fragment))
.Concat(last));
}
public Expr(ICFMangleContext ctx)
: base(ctx)
{
_invCompiled = new CilFragment();
_stateVar = new Local(ctx.Method.Module.CorLibTypes.Int32);
var body = ctx.Method.Body;
body.Variables.Add(_stateVar);
body.InitLocals = true;
var nm = new IntGenerator(ctx.Mangler.Rng, ctx.Mangler.Options.MaxMangleIterations);
var codec = nm.Generate();
codec.ParameterResolver = p => p == nm.Argument ? _stateVar : null;
_codec = codec;
var emitter = DnextFactory.NewILEmitter(ctx.Method.Module, ctx.Importer, _invCompiled);
codec.EmitDemangler(emitter);
}
public Impl(Switch @switch, ICFMangleContext context)
{
_switch = @switch;
_context = context;
_local = new Local(_context.Method.Module.CorLibTypes.UInt32);
_context.MethodBody.Variables.Add(_local);
_context.MethodBody.InitLocals = true;
var rng = _switch.Mangler.Rng;
switch (rng.NextUInt32(2)) // case 2 is null predicate, which is OK
{
case 0:
_predicate = new SwitchPredicate.Xor(_context);
break;
case 1:
_predicate = new SwitchPredicate.Expr(_context);
break;
}
}
public abstract void Mangle(ICFMangleContext context, Block.Regular block);
public Xor(ICFMangleContext ctx)
: base(ctx)
{
_xorKey = ctx.Mangler.Rng.NextInt32();
}
protected SwitchPredicate(ICFMangleContext technique)
{
_context = technique;
}
public override void Mangle(ICFMangleContext context, Block.Regular block)
{
PropImpl.GetOrAdd(context, () => new Impl(this, context)).Mangle(block);
}