1 /* 2 * Copyright (c) 2015, 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 package jdk.jfr.event.oldobject; 26 27 import java.util.ArrayList; 28 import java.util.List; 29 30 import jdk.jfr.Recording; 31 import jdk.jfr.consumer.RecordedEvent; 32 import jdk.jfr.internal.test.WhiteBox; 33 import jdk.test.lib.jfr.EventNames; 34 import jdk.test.lib.jfr.Events; 35 36 /* 37 * @test 38 * @key jfr 39 * @requires vm.gc == "null" 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.TestCircularReference 43 */ 44 public class TestCircularReference { 45 46 static class TestCircularReferrer { 47 // Allocate array to trigger sampling code path for interpreter / c1 48 final byte[] leak = new byte[1_0000_000]; 49 TestCircularReferrer reference; 50 51 public void setReference(TestCircularReferrer reference) { 52 this.reference = reference; 53 } 54 } 55 56 public final static List<Object> referenceHolder = new ArrayList<>(OldObjects.MIN_SIZE); 57 58 public static void main(String[] args) throws Exception { 59 WhiteBox.setWriteAllObjectSamples(true); 60 61 try (Recording r = new Recording()) { 62 r.enable(EventNames.OldObjectSample).with("cutoff", "infinity").withStackTrace(); 63 r.start(); 64 65 TestCircularReferrer a = new TestCircularReferrer(); 66 TestCircularReferrer b = new TestCircularReferrer(); 67 TestCircularReferrer c = new TestCircularReferrer(); 68 a.setReference(b); 69 b.setReference(c); 70 c.setReference(a); 71 referenceHolder.add(a); 72 73 TestCircularReferrer selfReflector = new TestCircularReferrer(); 74 selfReflector.setReference(selfReflector); 75 referenceHolder.add(selfReflector); 76 77 r.stop(); 78 79 List<RecordedEvent> events = Events.fromRecording(r); 80 if (events.isEmpty()) { 81 throw new AssertionError("Expected Old Object Sample events!"); 82 } 83 } 84 } 85 }