1 /*
   2  * Copyright (c) 2018, 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 does not do infinite recursion.
  31  * @build Frame HeapMonitor
  32  * @compile HeapMonitorRecursiveTest.java
  33  * @run main/othervm/native -agentlib:HeapMonitorTest MyPackage.HeapMonitorRecursiveTest
  34  */
  35 public class HeapMonitorRecursiveTest {
  36   private native static void setCallbackToCallAllocateSomeMore();
  37   private native static boolean didCallback();
  38   private static int[] tab;
  39 
  40   public static void main(String[] args) throws Exception {
  41     // Set ourselves to sample everything.
  42     HeapMonitor.sampleEverything();
  43 
  44     // Set a callback that does allocate more data. If a callback's allocations get sampled, this
  45     // would do an infinite recursion.
  46     setCallbackToCallAllocateSomeMore();
  47 
  48     // Do a few allocations now and see if the callback happens and the program finishes:
  49     for (int i = 0; i < 1000; i++) {
  50       tab = new int[1024];
  51     }
  52 
  53     if (!didCallback()) {
  54       throw new RuntimeException("Did not get a callback...");
  55     }
  56   }
  57 }