UnityEditor.ParticleSystemEditorUtils.CheckCircularReferences C# (CSharp) Method

        internal static extern string CheckCircularReferences(ParticleSystem subEmitter);
        public static ParticleSystem GetRoot(ParticleSystem ps)

 private void Update()
 {
     if (this.m_CheckObjectIndex >= 0)
     {
         if (!ObjectSelector.isVisible)
         {
             SerializedProperty arrayElementAtIndex  = this.m_SubEmitters.GetArrayElementAtIndex(this.m_CheckObjectIndex);
             SerializedProperty serializedProperty   = arrayElementAtIndex.FindPropertyRelative("emitter");
             UnityEngine.Object objectReferenceValue = serializedProperty.objectReferenceValue;
             ParticleSystem     particleSystem       = objectReferenceValue as ParticleSystem;
             if (particleSystem != null)
             {
                 bool flag = true;
                 if (this.ValidateSubemitter(particleSystem))
                 {
                     string text = ParticleSystemEditorUtils.CheckCircularReferences(particleSystem);
                     if (text.Length == 0)
                     {
                         if (!this.CheckIfChild(objectReferenceValue))
                         {
                             flag = false;
                         }
                     }
                     else
                     {
                         string message = string.Format("'{0}' could not be assigned as subemitter on '{1}' due to circular referencing!\nBacktrace: {2} \n\nReference will be removed.", particleSystem.gameObject.name, this.m_ParticleSystemUI.m_ParticleSystem.gameObject.name, text);
                         EditorUtility.DisplayDialog("Circular References Detected", message, "Ok");
                         flag = false;
                     }
                 }
                 else
                 {
                     flag = false;
                 }
                 if (!flag)
                 {
                     serializedProperty.objectReferenceValue = null;
                     this.m_ParticleSystemUI.ApplyProperties();
                     this.m_ParticleSystemUI.m_ParticleEffectUI.m_Owner.Repaint();
                 }
             }
             this.m_CheckObjectIndex  = -1;
             EditorApplication.update = (EditorApplication.CallbackFunction)Delegate.Remove(EditorApplication.update, new EditorApplication.CallbackFunction(this.Update));
         }
     }
 }