public bool IsRoot(ThingInMemory thing, out string reason)
{
reason = null;
if (thing is StaticFields)
{
reason = "Static fields are global variables. Anything they reference will not be unloaded.";
return(true);
}
if (thing is ManagedObject)
{
return(false);
}
if (thing is GCHandle)
{
return(false);
}
var nativeObject = thing as NativeUnityEngineObject;
if (nativeObject == null)
{
// throw new ArgumentException("Unknown type: " + thing.GetType());
return(false);
}
if (nativeObject.isManager)
{
reason = "this is an internal unity'manager' style object, which is a global object that will never be unloaded";
return(true);
}
if (nativeObject.isDontDestroyOnLoad)
{
reason = "DontDestroyOnLoad() was called on this object, so it will never be unloaded";
return(true);
}
if ((nativeObject.hideFlags & HideFlags.DontUnloadUnusedAsset) != 0)
{
reason = "the DontUnloadUnusedAsset hideflag is set on this object. Unity's builtin resources set this flag. Users can also set the flag themselves";
return(true);
}
if (nativeObject.isPersistent)
{
return(false);
}
if (IsComponent(nativeObject.classID))
{
reason = "this is a component, living on a gameobject, that is either part of the loaded scene, or was generated by script. It will be unloaded on next scene load.";
return(true);
}
if (IsGameObject(nativeObject.classID))
{
reason = "this is a gameobject, that is either part of the loaded scene, or was generated by script. It will be unloaded on next scene load if nobody is referencing it";
return(true);
}
if (IsAssetBundle(nativeObject.classID))
{
reason = "this object is an assetbundle, which is never unloaded automatically, but only through an explicit .Unload() call.";
return(true);
}
reason = "This object is a root, but the memory profiler UI does not yet understand why";
return(true);
}