1 /*
   2  * Copyright (c) 2017, 2018, Red Hat, Inc. All rights reserved.
   3  *
   4  * This code is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License version 2 only, as
   6  * published by the Free Software Foundation.
   7  *
   8  * This code is distributed in the hope that it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  11  * version 2 for more details (a copy is included in the LICENSE file that
  12  * accompanied this code).
  13  *
  14  * You should have received a copy of the GNU General Public License version
  15  * 2 along with this work; if not, write to the Free Software Foundation,
  16  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  17  *
  18  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  19  * or visit www.oracle.com if you need additional information or have any
  20  * questions.
  21  *
  22  */
  23 
  24 /**
  25  * @test TestHeapDump
  26  * @summary Tests JVMTI heap dumps
  27  * @key gc
  28  * @requires vm.gc.Shenandoah & !vm.graal.enabled
  29  * @compile TestHeapDump.java
  30  * @run main/othervm/native/timeout=300 -agentlib:TestHeapDump -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx128m -XX:ShenandoahGCHeuristics=aggressive                        TestHeapDump
  31  *
  32  */
  33 
  34 /**
  35  * @test TestHeapDump
  36  * @summary Tests JVMTI heap dumps
  37  * @key gc
  38  * @requires vm.gc.Shenandoah & !vm.graal.enabled & (vm.bits == "64")
  39  * @compile TestHeapDump.java
  40  * @run main/othervm/native/timeout=300 -agentlib:TestHeapDump -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx128m -XX:ShenandoahGCHeuristics=aggressive -XX:-UseCompressedOops TestHeapDump
  41  */
  42 
  43 public class TestHeapDump {
  44 
  45     private static final int NUM_ITER = 10000;
  46 
  47     private static final int ARRAY_SIZE = 1000;
  48 
  49     private static final int EXPECTED_OBJECTS =
  50             ARRAY_SIZE +   // array reachable from instance field
  51                     1 +            // static field root
  52                     1;             // local field root
  53 
  54     static {
  55         try {
  56             System.loadLibrary("TestHeapDump");
  57         } catch (UnsatisfiedLinkError ule) {
  58             System.err.println("Could not load TestHeapDump library");
  59             System.err.println("java.library.path: "
  60                     + System.getProperty("java.library.path"));
  61             throw ule;
  62         }
  63     }
  64 
  65     native static int heapdump(Class<?> filterClass);
  66 
  67     public static void main(String args[]) {
  68         new TestHeapDump().run();
  69     }
  70 
  71     // This root needs to be discovered
  72     static Object root = new TestObject();
  73 
  74     // This field needs to be discovered
  75     TestObject[] array;
  76 
  77     public void run() {
  78         array = new TestObject[ARRAY_SIZE];
  79         for (int i = 0; i < ARRAY_SIZE; i++) {
  80             array[i] = new TestObject();
  81         }
  82         TestObject localRoot = new TestObject();
  83         for (int i = 0; i < NUM_ITER; i++) {
  84             int numObjs = heapdump(TestObject.class);
  85             if (numObjs != EXPECTED_OBJECTS) {
  86                 throw new RuntimeException("Expected " + EXPECTED_OBJECTS + " objects, but got " + numObjs);
  87             }
  88         }
  89     }
  90 
  91     // We look for the instances of this class during the heap scan
  92     public static class TestObject {}
  93 }