static Map<S, Long> unsafe_allFieldOffsets(O o){
  Class src = _getClass(o);
  
  new Map<S, Long> map;
  while (src != O.class) {
    for (Field f : src.getDeclaredFields()) {
      if ((f.getModifiers() & Modifier.STATIC) == 0) {
        long offset = theUnsafe().objectFieldOffset(f);
        map.put(f.getName(), offset);
      }
    }
    src = src.getSuperclass();
  }
  ret orderMapByValue(map);
}