code: public static FieldSpec newFieldOffset(String className, String varName) {
      String fieldName = CaseFormat.LOWER_CAMEL.to(CaseFormat.UPPER_UNDERSCORE, varName);
      return FieldSpec
          .builder(long.class, offsetName(varName), Modifier.PROTECTED, Modifier.STATIC, Modifier.FINAL)
          .initializer("$T.objectFieldOffset($T.class, $L.$L)", UNSAFE_ACCESS,
              ClassName.bestGuess(className),  LOCAL_CACHE_FACTORY, fieldName)
          .build();
    }
docs: Creates a public static field with an Unsafe address offset.