src/v8/test/mjsunit/compiler/object-getprototypeof.js

// Copyright 2017 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

// Flags: --allow-natives-syntax

var prototype = Object.create(null);
var object = Object.create(prototype);

function foo() { return Object.getPrototypeOf(object); }

%PrepareFunctionForOptimization(foo);
assertSame(prototype, foo());
assertSame(prototype, foo());
%OptimizeFunctionOnNextCall(foo);
assertSame(prototype, foo());