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.Modifier;

    29 import java.util.HashSet;

    30 import java.util.List;

    31 import java.util.Set;

    32 

    33 import jdk.jfr.Recording;

    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.gc == "null"

    45  * @library /test/lib /test/jdk

    46  * @modules jdk.jfr/jdk.jfr.internal.test

    47  * @run main/othervm -XX:TLABSize=2k -Xlog:gc+tlab=trace jdk.jfr.event.oldobject.TestFieldInformation

    48  */

    49 public class TestFieldInformation {

    50 

    51     public static final Object[] testField = new Object[50];

    52 

    53     public static void main(String[] args) throws Exception {

    54         WhiteBox.setWriteAllObjectSamples(true);

    55 

    56         try (Recording recording = new Recording()) {

    57             recording.enable(EventNames.OldObjectSample).withoutStackTrace().with("cutoff", "infinity");

    58             recording.start();

    59 

    60             addToTestField();

    61 

    62             recording.stop();

    63 

    64             List<RecordedEvent> events = Events.fromRecording(recording);

    65             Events.hasEvents(events);

    66             for (RecordedEvent e : events) {

    67                 if (hasValidField(e)) {

    68                     return;

    69                 }

    70             }

    71             System.out.println(events);

    72             Asserts.fail("Could not find old object with field 'testField'");

    73         }

    74     }

    75 

    76     private static boolean hasValidField(RecordedEvent e) throws Exception {

    77         RecordedObject object = e.getValue("object");

    78         Set<Long> visited = new HashSet<>();

    79         while (object != null) {

    80             Long address = object.getValue("address");

    81             if (visited.contains(address)) {

    82                 return false;

    83             }

    84             visited.add(address);

    85             RecordedObject referrer = object.getValue("referrer");

    86             RecordedObject fieldObject = referrer != null ? referrer.getValue("field") : null;

    87             if (fieldObject != null) {

    88                 String name = fieldObject.getValue("name");

    89                 if (name != null && name.equals("testField")) {

    90                     int modifiers = (short) fieldObject.getValue("modifiers");

    91                     if (!Modifier.isStatic(modifiers)) {

    92                         throw new Exception("Field should be static");

    93                     }

    94                     if (!Modifier.isPublic(modifiers)) {

    95                         throw new Exception("Field should be private");

    96                     }

    97                     if (!Modifier.isFinal(modifiers)) {

    98                         throw new Exception("Field should be final");

    99                     }

   100                     if (Modifier.isTransient(modifiers)) {

   101                         throw new Exception("Field should not be transient");

   102                     }

   103                     if (Modifier.isVolatile(modifiers)) {

   104                         throw new Exception("Field should not be volatile");

   105                     }

   106                     return true;

   107                 }

   108             }

   109             object = referrer != null ? referrer.getValue("object") : null;

   110         }

   111         return false;

   112     }

   113 

   114     private static void addToTestField() {

   115         for (int i = 0; i < testField.length; i++) {

   116             // Allocate array to trigger sampling code path for interpreter / c1

   117             testField[i] = new Object[1_000_000];

   118         }

   119     }

   120 }