code: public static LineMap getScriptLineMap(String className, ClassLoader loader)
    {
      try {
        Class cl = loader.loadClass(className);
  
        LineMap map = _scriptMap.get(cl);
  
        if (map == null) {
          map = loadScriptMap(cl);
          _scriptMap.put(cl, map);
        }
  
        return map;
      } catch (Throwable e) {
        return null;
      }
    }
docs: Loads the local line map for a class.