1 /*
   2  * Copyright (c) 2017, Google and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 package MyPackage;
  25 
  26 import java.util.List;
  27 
  28 /**
  29  * @test
  30  * @summary Verifies the JVMTI Heap Monitor API
  31  * @build Frame HeapMonitor
  32  * @compile HeapMonitorTest.java
  33  * @run main/othervm/native -agentlib:HeapMonitor MyPackage.HeapMonitorTest
  34  */
  35 
  36 public class HeapMonitorTest {
  37 
  38   private static native boolean framesAreNotLive(Frame[] frames);
  39 
  40   public static void main(String[] args) {
  41     HeapMonitor.enableSampling();
  42     List<Frame> frameList = HeapMonitor.allocate();
  43     frameList.add(new Frame("main", "([Ljava/lang/String;)V", "HeapMonitorTest.java", 42));
  44 
  45     Frame[] frames = frameList.toArray(new Frame[0]);
  46     boolean status = HeapMonitor.framesExistEverywhere(frames);
  47     if (!status) {
  48       throw new RuntimeException("Non-zero status returned from the agent: " + status);
  49     }
  50 
  51     // By freeing the storage and looking at live objects, the expected frames should no longer be
  52     // there since looking at live objects provokes a full GC.
  53     HeapMonitor.freeStorage();
  54     status = framesAreNotLive(frames);
  55   }
  56 }