content: /*
   * Copyright (C) 2015 The Android Open Source Project
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  import sun.misc.Unsafe;
  import java.lang.reflect.Field;
  
  public class Main {
  
    long instanceField;
    static long myLongField1;
    static long myLongField2;
  
    public static void main(String[] args) throws Exception {
      Unsafe unsafe = getUnsafe();
      Main f = new Main();
      long offset = unsafe.objectFieldOffset(Main.class.getDeclaredField("instanceField"));
      getUnsafe(); // spill offset
      long a = myLongField1;
      // We used the hinted register for the low part of b, which is EBX, as requested
      // by the intrinsic below. Allocating EBX for the low part, would put ESP as the high
      // part, and we did not check that ESP was blocked.
      long b = myLongField2;
      unsafe.compareAndSwapLong(f, offset, a, b);
    }
  
  
    private static Unsafe getUnsafe() throws Exception {
      Field f = Unsafe.class.getDeclaredField("theUnsafe");
      f.setAccessible(true);
      return (Unsafe) f.get(null);
    }
  }
  