public LocalCtxFrame CreateNext()
{
var nextFrame = new LocalCtxFrame(this);
this.Next = nextFrame;
return(nextFrame);
}
public LocalCtxFrame(LocalCtxFrame prev)
{
this.Prev = prev;
this.Next = null;
this.Depth = prev.Depth + 1;
this.Locals = new HashSet <ObjPtr>();
}
private ObjPtr SelectObject(LocalCtxFrame frame, bool useStatics = true)
{
List <ObjPtr> ptrs;
if (useStatics)
{
ptrs = frame.Locals.Concat(_ctx.Statics).Distinct().ToList();
}
else
{
ptrs = frame.Locals.ToList();
}
if (ptrs.Count == 0)
{
return(ObjPtr.Zero);
}
else
{
return(this.SelectDeepObject(ptrs[_rnd.Next(0, ptrs.Count)]));
}
//if (_rnd.Next(100) > 50 && useStatics)
//{
// if (_ctx.Statics.Count > 0)
// return this.SelectDeepObject(_ctx.Statics.Skip(_rnd.Next(0, _ctx.Statics.Count)).First());
// else
// return ObjPtr.Zero;
//}
//else
//{
// if (frame.Locals.Count > 0)
// return this.SelectDeepObject(frame.Locals.Skip(_rnd.Next(0, frame.Locals.Count)).First());
// else
// return ObjPtr.Zero;
//}
}
private ObjPtr PerformAction(MutatorActionKind actionKind, ref LocalCtxFrame frame)
{
ObjPtr ptr;
switch (actionKind)
{
case MutatorActionKind.None:
ptr = ObjPtr.Zero;
break;
case MutatorActionKind.Call:
frame = frame.CreateNext();
ptr = ObjPtr.Zero;
break;
case MutatorActionKind.Return:
frame = frame.ResumePrev();
ptr = ObjPtr.Zero;
break;
case MutatorActionKind.Newobj:
frame.Locals.Add(ptr = _ctx.Runtime.AllocRandomObj(_rnd));
break;
case MutatorActionKind.PutStatic:
{
lock (_ctx.Statics)
{
if (frame.Locals.Count > 0)
{
_ctx.Statics.Add(ptr = frame.Locals.Skip(_rnd.Next(0, frame.Locals.Count)).First());
}
else
{
ptr = ObjPtr.Zero;
}
}
}
break;
case MutatorActionKind.ChangeStatic:
{
lock (_ctx.Statics)
{
if (_ctx.Statics.Count > 0 && frame.Locals.Count > 0)
{
_ctx.Statics.Remove(_ctx.Statics.Skip(_rnd.Next(0, _ctx.Statics.Count)).First());
_ctx.Statics.Add(ptr = frame.Locals.Skip(_rnd.Next(0, frame.Locals.Count)).First());
}
else
{
ptr = ObjPtr.Zero;
}
}
}
break;
case MutatorActionKind.EraseStatic:
{
lock (_ctx.Statics)
{
if (_ctx.Statics.Count > 0)
{
_ctx.Statics.Remove(ptr = _ctx.Statics.Skip(_rnd.Next(0, _ctx.Statics.Count)).First());
}
else
{
ptr = ObjPtr.Zero;
}
}
}
break;
case MutatorActionKind.PutRef:
{
lock (_ctx.Statics)
{
ptr = this.SelectObject(frame);
if (ptr.value != IntPtr.Zero)
{
_refBuffer.Value = _ctx.Runtime.ObjToBlock(this.SelectObject(frame, useStatics: false)).value;
var refs = _ctx.Runtime.GetRefs(ptr);
var field = refs.FirstOrDefault(f => { f.GetValue(_ctx.Runtime.ObjToBlock(ptr), _refBuffer.buffPtr); return(_refBuffer.Value == IntPtr.Zero); });
if (field != null)
{
field.SetValue(_ctx.Runtime.ObjToBlock(ptr), _refBuffer.buffPtr);
}
else
{
refs[_rnd.Next(0, refs.Length)].SetValue(_ctx.Runtime.ObjToBlock(ptr), _refBuffer.buffPtr);
}
}
}
}
break;
case MutatorActionKind.ChangeRef:
{
lock (_ctx.Statics)
{
ptr = this.SelectObject(frame);
if (ptr.value != IntPtr.Zero)
{
_refBuffer.Value = _ctx.Runtime.ObjToBlock(this.SelectObject(frame, useStatics: false)).value;
var refs = _ctx.Runtime.GetRefs(ptr);
refs[_rnd.Next(0, refs.Length)].SetValue(_ctx.Runtime.ObjToBlock(ptr), _refBuffer.buffPtr);
}
}
}
break;
case MutatorActionKind.EraseRef:
{
lock (_ctx.Statics)
{
ptr = this.SelectObject(frame);
if (ptr.value != IntPtr.Zero)
{
var refs = _ctx.Runtime.GetRefs(ptr);
var field = refs.FirstOrDefault(f => { f.GetValue(_ctx.Runtime.ObjToBlock(ptr), _refBuffer.buffPtr); return(_refBuffer.Value != IntPtr.Zero); });
_refBuffer.Value = IntPtr.Zero;
if (field != null)
{
field.SetValue(_ctx.Runtime.ObjToBlock(ptr), _refBuffer.buffPtr);
}
}
}
}
break;
default:
throw new NotImplementedException("Unknown action " + actionKind);
}
return(ptr);
}
