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 /**
  27  * @test
  28  * @summary Verifies the JVMTI Heap Monitor API
  29  * @compile HeapMonitorTest.java
  30  * @run main/othervm/native -agentlib:HeapMonitor MyPackage.HeapMonitorTest
  31  */
  32 
  33 import java.io.PrintStream;
  34 
  35 public class HeapMonitorTest {
  36 
  37   static {
  38     try {
  39       System.loadLibrary("HeapMonitor");
  40     } catch (UnsatisfiedLinkError ule) {
  41       System.err.println("Could not load HeapMonitor library");
  42       System.err.println("java.library.path: "
  43           + System.getProperty("java.library.path"));
  44       throw ule;
  45     }
  46   }
  47 
  48   native static int check();
  49 
  50   public static int cnt;
  51   public static int g_tmp[];
  52   public int array[];
  53 
  54   public static int helper() {
  55     int sum = 0;
  56     // Let us assume that the array is 24 bytes of memory.
  57     for (int i = 0; i < 127000 / 6; i++) {
  58       int tmp[] = new int[1];
  59       // Force it to be kept.
  60       g_tmp = tmp;
  61       sum += g_tmp[0];
  62     }
  63     return sum;
  64   }
  65 
  66   public static void main(String[] args) {
  67     int sum = 0;
  68     for (int j = 0; j < 1000; j++) {
  69       sum += helper();
  70     }
  71     System.out.println(sum);
  72 
  73     int status = check();
  74     if (status != 0) {
  75       throw new RuntimeException("Non-zero status returned from the agent: " + status);
  76     }
  77   }
  78 }