1 /*
   2  * Copyright (c) 2018, Oracle 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.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package jdk.jfr.event.oldobject;
  27 
  28 import java.util.ArrayList;
  29 import java.util.List;
  30 
  31 import jdk.jfr.Recording;
  32 import jdk.jfr.consumer.RecordedEvent;
  33 import jdk.jfr.internal.test.WhiteBox;
  34 import jdk.test.lib.jfr.EventNames;
  35 import jdk.test.lib.jfr.Events;
  36 
  37 /*
  38  * @test
  39  * @key jfr
  40  * @requires vm.gc == "null"
  41  * @library /test/lib /test/jdk
  42  * @modules jdk.jfr/jdk.jfr.internal.test
  43  * @run main/othervm -XX:TLABSize=2k jdk.jfr.event.oldobject.TestListenerLeak
  44  */
  45 public class TestListenerLeak {
  46 
  47     private interface TestListener {
  48         void onListen();
  49     }
  50 
  51     static class Stuff {
  52     }
  53 
  54     static class ListenerThread extends Thread {
  55 
  56         private List<Stuff[]> stuff;
  57 
  58         public ListenerThread(List<Stuff[]> stuff) {
  59             this.stuff = stuff;
  60         }
  61 
  62         public void run() {
  63             listener.add(new TestListener() {
  64                 @Override
  65                 public void onListen() {
  66                     System.out.println(stuff);
  67                 }
  68             });
  69         }
  70     }
  71 
  72     private static List<TestListener> listener = new ArrayList<>();
  73 
  74     public static void main(String[] args) throws Exception {
  75         WhiteBox.setWriteAllObjectSamples(true);
  76 
  77         try (Recording r = new Recording()) {
  78             r.enable(EventNames.OldObjectSample).withStackTrace().with("cutoff", "infinity");
  79             r.start();
  80             listenerLeak();
  81             r.stop();
  82             List<RecordedEvent> events = Events.fromRecording(r);
  83             if (OldObjects.countMatchingEvents(events, Stuff[].class, null, null, -1, "listenerLeak") == 0) {
  84                 throw new Exception("Could not find leak with " + Stuff[].class);
  85             }
  86         }
  87     }
  88 
  89     private static void listenerLeak() throws InterruptedException {
  90         List<Stuff[]> stuff = new ArrayList<>(OldObjects.MIN_SIZE);
  91         for (int i = 0; i < OldObjects.MIN_SIZE; i++) {
  92             // Allocate array to trigger sampling code path for interpreter / c1
  93             stuff.add(new Stuff[0]);
  94         }
  95 
  96         ListenerThread t = new ListenerThread(stuff);
  97         t.start();
  98         t.join();
  99     }
 100 
 101 }