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

Began life as a copy of #1011517