private static MethodHandle createGWT(
      MethodHandle test,
      MethodHandle target,
      MethodHandle fallback,
      CacheEntry entry,
      CallSite site) {
    MethodHandle myTest = MethodHandles.insertArguments(test, 0, entry);
    MethodHandle myTarget = MethodHandles.insertArguments(target, 0, entry);
    MethodHandle myFallback = MethodHandles.insertArguments(fallback, 0, site);
    MethodHandle guardWithTest = MethodHandles.guardWithTest(myTest, myTarget, myFallback);

    return MethodHandles.convertArguments(guardWithTest, site.type());
  }
  public static CallSite bootstrap(Class caller, String name, MethodType type) {
    JRubyCallSite site;

    if (name == "call") {
      site = new JRubyCallSite(caller, name, type, CallType.NORMAL);
    } else {
      site = new JRubyCallSite(caller, name, type, CallType.FUNCTIONAL);
    }

    MethodType fallbackType = type.insertParameterType(0, JRubyCallSite.class);
    MethodHandle myFallback =
        MethodHandles.insertArguments(
            MethodHandles.lookup().findStatic(InvokeDynamicSupport.class, "fallback", fallbackType),
            0,
            site);
    site.setTarget(myFallback);
    return site;
  }