private void EnumerateUsages() { foreach (KeyValuePair <long, ICollection <long> > nodeVariablesPair in Usages) { long uNodeId = nodeVariablesPair.Key; foreach (long variable in nodeVariablesPair.Value) { long usage = (long)(UsagesCount++); AppHelper.TakeValueByKey( NodeToUsesSet, uNodeId, () => new List <long>()) .Add(usage); if (!CFG.IsSinkNode(uNodeId)) { Ensure.That(NodeToVarMap.ContainsKey(uNodeId)).IsTrue(); } UseToNodeMap[usage] = uNodeId; } } }