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.lang.reflect.Array;
  29 import java.util.ArrayList;
  30 import java.util.List;
  31 
  32 import jdk.jfr.Recording;
  33 import jdk.jfr.consumer.RecordedClass;
  34 import jdk.jfr.consumer.RecordedEvent;
  35 import jdk.jfr.consumer.RecordedObject;
  36 import jdk.jfr.internal.test.WhiteBox;
  37 import jdk.test.lib.Asserts;
  38 import jdk.test.lib.jfr.EventNames;
  39 import jdk.test.lib.jfr.Events;
  40 
  41 /**
  42  * @test
  43  * @key jfr
  44  * @requires vm.hasJFR
  45  * @requires vm.gc == "null"
  46  * @library /test/lib /test/jdk
  47  * @modules jdk.jfr/jdk.jfr.internal.test
  48  * @run main/othervm -XX:TLABSize=2k jdk.jfr.event.oldobject.TestClassLoaderLeak
  49  */
  50 public class TestClassLoaderLeak {
  51 
  52     public static List<Object> classObjects = new ArrayList<>(OldObjects.MIN_SIZE);
  53 
  54     public static void main(String[] args) throws Exception {
  55         WhiteBox.setWriteAllObjectSamples(true);
  56 
  57         try (Recording r = new Recording()) {
  58             r.enable(EventNames.OldObjectSample).withStackTrace().with("cutoff", "infinity");
  59             r.start();
  60             TestClassLoader testClassLoader = new TestClassLoader();
  61             for (Class<?> clazz : testClassLoader.loadClasses(OldObjects.MIN_SIZE / 20)) {
  62                 // Allocate array to trigger sampling code path for interpreter / c1
  63                 for (int i = 0; i < 20; i++) {
  64                     Object classArray = Array.newInstance(clazz, 20);
  65                     Array.set(classArray, i, clazz.newInstance());
  66                     classObjects.add(classArray);
  67                 }
  68             }
  69             r.stop();
  70             List<RecordedEvent> events = Events.fromRecording(r);
  71             Events.hasEvents(events);
  72             for (RecordedEvent e : events) {
  73                 RecordedObject object = e.getValue("object");
  74                 RecordedClass rc = object.getValue("type");
  75                 if (rc.getName().contains("TestClass")) {
  76                     return;
  77                 }
  78             }
  79             Asserts.fail("Could not find class leak");
  80         }
  81     }
  82 }