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/*
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* Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package jdk.jfr.event.oldobject;
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import java.lang.reflect.Array;
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import java.util.ArrayList;
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import java.util.HashSet;
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import java.util.List;
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import java.util.Set;
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import java.util.concurrent.Callable;
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import jdk.jfr.Recording;
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import jdk.jfr.consumer.RecordedEvent;
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import jdk.jfr.consumer.RecordedObject;
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import jdk.jfr.internal.test.WhiteBox;
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import jdk.test.lib.jfr.EventNames;
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import jdk.test.lib.jfr.Events;
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/*
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* @test
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* @key jfr
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* @requires vm.gc == "null"
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* @library /test/lib /test/jdk
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* @modules jdk.jfr/jdk.jfr.internal.test
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* @run main/othervm -XX:TLABSize=2k jdk.jfr.event.oldobject.TestObjectDescription
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*/
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public class TestObjectDescription {
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private static final int OBJECT_DESCRIPTION_MAX_SIZE = 100;
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private static final String CLASS_NAME = TestClassLoader.class.getName() + "$TestClass";
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public static List<?> leaks;
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public final static class MyThreadGroup extends ThreadGroup {
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public final static String NAME = "My Thread Group";
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public MyThreadGroup(String name) {
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super(name);
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}
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// Allocate array to trigger sampling code path for interpreter / c1
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byte[] bytes = new byte[10];
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}
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public final static class MyThread extends Thread {
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public final static String NAME = "My Thread";
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public MyThread() {
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super(NAME);
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}
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// Allocate array to trigger sampling code path for interpreter / c1
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byte[] bytes = new byte[10];
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}
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public static void main(String[] args) throws Exception {
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WhiteBox.setWriteAllObjectSamples(true);
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testThreadGroupName();
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testThreadName();
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testClassName();
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testSize();
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testEllipsis();
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}
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private static void testThreadName() throws Exception {
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asseertObjectDescription(() -> {
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List<MyThread> threads = new ArrayList<>(OldObjects.MIN_SIZE);
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for (int i = 0; i < OldObjects.MIN_SIZE; i++) {
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threads.add(new MyThread());
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}
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return threads;
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}, "Thread Name: " + MyThread.NAME);
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}
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private static void testThreadGroupName() throws Exception {
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asseertObjectDescription(() -> {
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List<MyThreadGroup> groups = new ArrayList<>(OldObjects.MIN_SIZE);
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for (int i = 0; i < OldObjects.MIN_SIZE; i++) {
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groups.add(new MyThreadGroup("My Thread Group"));
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}
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return groups;
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}, "Thread Group: " + "My Thread Group");
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}
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private static void testClassName() throws Exception {
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asseertObjectDescription(() -> {
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TestClassLoader testClassLoader = new TestClassLoader();
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List<Object> classObjects = new ArrayList<>(OldObjects.MIN_SIZE);
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for (Class<?> clazz : testClassLoader.loadClasses(OldObjects.MIN_SIZE / 20)) {
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// Allocate array to trigger sampling code path for interpreter / c1
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for (int i = 0; i < 20; i++) {
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Object classArray = Array.newInstance(clazz, 20);
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Array.set(classArray, i, clazz.newInstance());
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classObjects.add(classArray);
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}
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}
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return classObjects;
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}, "Class Name: " + CLASS_NAME);
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}
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private static void testSize() throws Exception {
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asseertObjectDescription(() -> {
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List<Object> arrayLists = new ArrayList<>(OldObjects.MIN_SIZE);
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for (int i = 0; i < OldObjects.MIN_SIZE; i++) {
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List<Object> arrayList = new ArrayList<>();
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arrayList.add(new Object());
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arrayList.add(new Object());
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arrayList.add(new Object());
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arrayLists.add(arrayList);
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}
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return arrayLists;
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}, "Size: 3");
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}
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private static void testEllipsis() throws Exception {
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asseertObjectDescription(() -> {
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StringBuilder sb = new StringBuilder();
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for (int i = 0; i < 2 * OBJECT_DESCRIPTION_MAX_SIZE; i++) {
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sb.append("x");
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}
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String threadName = sb.toString();
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List<Thread> threads = new ArrayList<>();
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for (int i = 0; i < OldObjects.MIN_SIZE; i++) {
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threads.add(new Thread(threadName));
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}
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return threads;
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}, "xxx...");
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}
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private static void asseertObjectDescription(Callable<List<?>> callable, String text) throws Exception {
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int iteration = 1;
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while (true) {
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try (Recording recording = new Recording()) {
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System.out.println("Iteration: " + iteration);
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recording.enable(EventNames.OldObjectSample).withoutStackTrace().with("cutoff", "infinity");
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recording.start();
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leaks = null;
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System.gc();
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leaks = callable.call();
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recording.stop();
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List<RecordedEvent> events = Events.fromRecording(recording);
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Set<String> objectDescriptions = extractObjectDecriptions(events);
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for (String s : objectDescriptions) {
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if (s.contains(text)) {
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printDescriptions(objectDescriptions);
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return;
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}
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}
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System.out.println("Could not find object description containing text \"" + text + "\"");
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printDescriptions(objectDescriptions);
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System.out.println();
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iteration++;
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}
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}
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}
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private static void printDescriptions(Set<String> objectDescriptions) {
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System.out.println("Found descriptions:");
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for (String t : objectDescriptions) {
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System.out.println(t);
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}
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}
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private static Set<String> extractObjectDecriptions(List<RecordedEvent> events) {
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Set<String> objectDescriptions = new HashSet<>();
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for (RecordedEvent e : events) {
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objectDescriptions.addAll(extractObjectDescriptions(e.getValue("object")));
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}
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return objectDescriptions;
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}
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private static Set<String> extractObjectDescriptions(RecordedObject o) {
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Set<Long> visited = new HashSet<>();
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Set<String> descriptions = new HashSet<>();
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while (o != null) {
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Long memoryAddress = o.getValue("address");
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if (visited.contains(memoryAddress)) {
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return descriptions;
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}
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visited.add(memoryAddress);
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String od = o.getValue("description");
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if (od != null) {
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descriptions.add(od);
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}
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RecordedObject referrer = o.getValue("referrer");
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o = referrer != null ? referrer.getValue("object") : null;
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}
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return descriptions;
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}
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}
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