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  *
  45  *
  46  * @library /lib /
  47  *
  48  * @run main/othervm -XX:TLABSize=2k -XX:+PrintGCDetails -XX:+PrintGC  -verbose:class jdk.jfr.event.oldobject.TestFieldInformation
  49  */
  50 public class TestFieldInformation {
  51 
  52     public static final Object[] testField = new Object[50];
  53 
  54     public static void main(String[] args) throws Exception {
  55         WhiteBox.setWriteAllObjectSamples(true);
  56 
  57         try (Recording recording = new Recording()) {
  58             recording.enable(EventNames.OldObjectSample).withoutStackTrace().with("cutoff", "infinity");
  59             recording.start();
  60 
  61             addToTestField();
  62 
  63             recording.stop();
  64 
  65             List<RecordedEvent> events = Events.fromRecording(recording);
  66             Events.hasEvents(events);
  67             for (RecordedEvent e : events) {
  68                 if (hasValidField(e)) {
  69                     return;
  70                 }
  71             }
  72             System.out.println(events);
  73             Asserts.fail("Could not find old object with field 'testField'");
  74         }
  75     }
  76 
  77     private static boolean hasValidField(RecordedEvent e) throws Exception {
  78         RecordedObject object = e.getValue("object");
  79         Set<Long> visited = new HashSet<>();
  80         while (object != null) {
  81             Long address = object.getValue("address");
  82             if (visited.contains(address)) {
  83                 return false;
  84             }
  85             visited.add(address);
  86             RecordedObject referrer = object.getValue("referrer");
  87             RecordedObject fieldObject = referrer != null ? referrer.getValue("field") : null;
  88             if (fieldObject != null) {
  89                 String name = fieldObject.getValue("name");
  90                 if (name != null && name.equals("testField")) {
  91                     int modifiers = (short) fieldObject.getValue("modifiers");
  92                     if (!Modifier.isStatic(modifiers)) {
  93                         throw new Exception("Field should be static");
  94                     }
  95                     if (!Modifier.isPublic(modifiers)) {
  96                         throw new Exception("Field should be private");
  97                     }
  98                     if (!Modifier.isFinal(modifiers)) {
  99                         throw new Exception("Field should be final");
 100                     }
 101                     if (Modifier.isTransient(modifiers)) {
 102                         throw new Exception("Field should not be transient");
 103                     }
 104                     if (Modifier.isVolatile(modifiers)) {
 105                         throw new Exception("Field should not be volatile");
 106                     }
 107                     return true;
 108                 }
 109             }
 110             object = referrer != null ? referrer.getValue("object") : null;
 111         }
 112         return false;
 113     }
 114 
 115     private static void addToTestField() {
 116         for (int i = 0; i < testField.length; i++) {
 117             // Allocate array to trigger sampling code path for interpreter / c1
 118             testField[i] = new Object[1_000_000];
 119         }
 120     }
 121 }