1 /*
 2  * Copyright (c) 2015, 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 package jdk.jfr.event.oldobject;
24 
25 import java.util.ArrayList;
26 import java.util.List;
27 
28 import jdk.jfr.Recording;
29 import jdk.jfr.consumer.RecordedEvent;
30 import jdk.jfr.internal.test.WhiteBox;
31 import jdk.test.lib.jfr.EventNames;
32 import jdk.test.lib.jfr.Events;
33 
34 /**
35  * @test
36  * @requires vm.flagless
37  * @requires vm.hasJFR
38  * @library /test/lib /test/jdk
39  * @modules jdk.jfr/jdk.jfr.internal.test
40  * @run main/othervm -XX:TLABSize=2k jdk.jfr.event.oldobject.TestHeapDeep
41  */
42 public class TestHeapDeep {
43 
44     final static class ChainNode {
45         final ChainNode next;
46         List<byte[]> leaks;
47 
48         public ChainNode(ChainNode node) {
49             next = node;
50         }
51     }
52 
53     public static ChainNode leak;
54 
55     public static void main(String[] args) throws Exception {
56         WhiteBox.setWriteAllObjectSamples(true);
57         while (true) {
58             try (Recording r = new Recording()) {
59                 r.enable(EventNames.OldObjectSample).withStackTrace().with("cutoff", "infinity");
60                 r.start();
61                 leak = createChain();
62                 List<RecordedEvent> events = Events.fromRecording(r);
63                 if (OldObjects.countMatchingEvents(events, byte[].class, null, null, -1, "createChain") > 0) {
64                     for (RecordedEvent e : events) {
65                         OldObjects.validateReferenceChainLimit(e, OldObjects.MAX_CHAIN_LENGTH);
66                     }
67                     return;
68                 }
69                 System.out.println("Could not find old object sample of type byte[]. Retrying.");
70                 leak = null;
71             }
72         }
73     }
74 
75     private static ChainNode createChain() {
76         ChainNode node = new ChainNode(null);
77         node.leaks = new ArrayList<>();
78         for (int i = 0; i < 100; i++) {
79             // Allocate arrays to trigger sampling code path for interpreter / c1
80             node.leaks.add(new byte[10_000]);
81         }
82         for (int i = 0; i < OldObjects.MIN_SIZE; i++) {
83             node = new ChainNode(node);
84         }
85         return node;
86     }
87 }