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

    29  * @compile TestHeapDump.java

    30  * @run main/othervm/native/timeout=300 -agentlib:TestHeapDump -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx128m -XX:ShenandoahGCHeuristics=aggressive -XX:+UseCompressedOops TestHeapDump

    31  * @run main/othervm/native/timeout=300 -agentlib:TestHeapDump -XX:+UnlockDiagnosticVMOptions -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xmx128m -XX:ShenandoahGCHeuristics=aggressive -XX:-UseCompressedOops TestHeapDump

    32  */

    33 

    34 public class TestHeapDump {

    35 

    36     private static final int NUM_ITER = 10000;

    37 

    38     private static final int ARRAY_SIZE = 1000;

    39 

    40     private static final int EXPECTED_OBJECTS =

    41             ARRAY_SIZE +   // array reachable from instance field

    42                     1 +            // static field root

    43                     1;             // local field root

    44 

    45     static {

    46         try {

    47             System.loadLibrary("TestHeapDump");

    48         } catch (UnsatisfiedLinkError ule) {

    49             System.err.println("Could not load TestHeapDump library");

    50             System.err.println("java.library.path: "

    51                     + System.getProperty("java.library.path"));

    52             throw ule;

    53         }

    54     }

    55 

    56     native static int heapdump(Class<?> filterClass);

    57 

    58     public static void main(String args[]) {

    59         new TestHeapDump().run();

    60     }

    61 

    62     // This root needs to be discovered

    63     static Object root = new TestObject();

    64 

    65     // This field needs to be discovered

    66     TestObject[] array;

    67 

    68     public void run() {

    69         array = new TestObject[ARRAY_SIZE];

    70         for (int i = 0; i < ARRAY_SIZE; i++) {

    71             array[i] = new TestObject();

    72         }

    73         TestObject localRoot = new TestObject();

    74         for (int i = 0; i < NUM_ITER; i++) {

    75             int numObjs = heapdump(TestObject.class);

    76             if (numObjs != EXPECTED_OBJECTS) {

    77                 throw new RuntimeException("Expected " + EXPECTED_OBJECTS + " objects, but got " + numObjs);

    78             }

    79         }

    80     }

    81 

    82     // We look for the instances of this class during the heap scan

    83     public static class TestObject {}

    84 }