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/*
 * @test TestMemBarAcquire
 * @bug 8048879
 * @summary "Tests optimization of MemBarAcquireNodes"
 * @run main/othervm -XX:-TieredCompilation -XX:-BackgroundCompilation TestMemBarAcquire
 */
public class TestMemBarAcquire {
  private volatile static Object defaultObj = new Object();
  private Object obj;

  public TestMemBarAcquire(Object param) {
    // Volatile load. MemBarAcquireNode is added after the
    // load to prevent following loads from floating up past.
    // StoreNode is added to store result of load in 'obj'.
    this.obj = defaultObj;
    // Overrides 'obj' and therefore makes previous StoreNode
    // and the corresponding LoadNode useless. However, the
    // LoadNode is still connected to the MemBarAcquireNode 
    // that should now release the reference.
    this.obj = param;
  }

  public static void main(String[] args) throws Exception {
    // Make sure TestMemBarAcquire::<init> is compiled
    for (int i = 0; i < 100000; ++i) {
      TestMemBarAcquire p = new TestMemBarAcquire(new Object());
    }
  }
}