1 /*
 2  * Copyright (c) 2018, 2025, 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.
 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 jdk.jfr.event.oldobject;
25 
26 import java.util.ArrayList;
27 import java.util.List;
28 
29 import jdk.jfr.Recording;
30 import jdk.jfr.consumer.RecordedEvent;
31 import jdk.jfr.internal.test.WhiteBox;
32 import jdk.test.lib.jfr.EventNames;
33 import jdk.test.lib.jfr.Events;
34 
35 /**
36  * @test
37  * @requires vm.flagless
38  * @requires vm.hasJFR
39  * @requires !(vm.opt.final.UseCompactObjectHeaders == true | vm.opt.final.UseShenandoahGC == true)
40  * @library /test/lib /test/jdk
41  * @modules jdk.jfr/jdk.jfr.internal.test
42  * @run main/othervm -XX:TLABSize=2k jdk.jfr.event.oldobject.TestThreadLocalLeak
43  */
44 public class TestThreadLocalLeak {
45 
46     private static ThreadLocal<List<ThreadLocalObject[]>> threadLocal = new ThreadLocal<List<ThreadLocalObject[]>>() {
47         @Override
48         public List<ThreadLocalObject[]> initialValue() {
49             return new ArrayList<ThreadLocalObject[]>(OldObjects.MIN_SIZE);
50         }
51     };
52 
53     static class ThreadLocalObject {
54     }
55 
56     public static void main(String[] args) throws Exception {
57         WhiteBox.setWriteAllObjectSamples(true);
58 
59         while (true) {
60             try (Recording r = new Recording()) {
61                 r.enable(EventNames.OldObjectSample).withStackTrace().with("cutoff", "infinity");
62                 r.start();
63                 allocateThreadLocal();
64                 r.stop();
65                 List<RecordedEvent> events = Events.fromRecording(r);
66                 if (OldObjects.countMatchingEvents(events, ThreadLocalObject[].class, null, null, -1, "allocateThreadLocal") > 0) {
67                     return;
68                 }
69                 System.out.println("Failed to find ThreadLocalObject leak. Retrying.");
70                 threadLocal.get().clear();
71             }
72         }
73     }
74 
75     private static void allocateThreadLocal() {
76         for (int i = 0; i < OldObjects.MIN_SIZE; i++) {
77             // Allocate array to trigger sampling code path for interpreter / c1
78             threadLocal.get().add(new ThreadLocalObject[0]);
79         }
80     }
81 
82 }