127 lines
4.0 KiB
Java
127 lines
4.0 KiB
Java
/*
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* Copyright (c) 2020, 2022, 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.
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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 gc;
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/* @test
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* @requires vm.gc != "Shenandoah" | vm.opt.ShenandoahGCMode != "iu"
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* @library /test/lib
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* @build jdk.test.whitebox.WhiteBox
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* @run driver jdk.test.lib.helpers.ClassFileInstaller jdk.test.whitebox.WhiteBox
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* @run main/othervm
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* -Xbootclasspath/a:.
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* -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI
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* gc.TestReferenceRefersToDuringConcMark
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*/
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import java.lang.ref.Reference;
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import java.lang.ref.WeakReference;
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import jdk.test.whitebox.WhiteBox;
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public class TestReferenceRefersToDuringConcMark {
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private static final WhiteBox WB = WhiteBox.getWhiteBox();
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private static volatile Object testObject = null;
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private static WeakReference<Object> testWeak = null;
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private static void setup() {
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testObject = new Object();
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testWeak = new WeakReference<Object>(testObject);
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}
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private static void gcUntilOld(Object o) throws Exception {
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if (!WB.isObjectInOldGen(o)) {
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WB.fullGC();
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if (!WB.isObjectInOldGen(o)) {
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fail("object not promoted by full gc");
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}
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}
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}
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private static void gcUntilOld() throws Exception {
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gcUntilOld(testObject);
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gcUntilOld(testWeak);
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}
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private static void fail(String msg) throws Exception {
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throw new RuntimeException(msg);
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}
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private static void expectNotCleared(Reference<Object> ref,
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String which) throws Exception {
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if (ref.refersTo(null)) {
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fail("expected " + which + " to not be cleared");
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}
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}
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private static void expectValue(Reference<Object> ref,
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Object value,
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String which) throws Exception {
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expectNotCleared(ref, which);
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if (!ref.refersTo(value)) {
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fail(which + " doesn't refer to expected value");
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}
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}
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private static void checkInitialStates() throws Exception {
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expectValue(testWeak, testObject, "testWeak");
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}
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private static void discardStrongReferences() {
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testObject = null;
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}
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private static void testConcurrentCollection() throws Exception {
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setup();
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gcUntilOld();
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WB.concurrentGCAcquireControl();
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try {
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checkInitialStates();
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discardStrongReferences();
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WB.concurrentGCRunTo(WB.BEFORE_MARKING_COMPLETED);
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// For most collectors - the configurations tested here -,
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// calling get() will keep testObject alive.
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if (testWeak.get() == null) {
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fail("testWeak unexpectedly == null");
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}
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WB.concurrentGCRunToIdle();
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expectNotCleared(testWeak, "testWeak");
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} finally {
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WB.concurrentGCReleaseControl();
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}
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}
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public static void main(String[] args) throws Exception {
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if (WB.supportsConcurrentGCBreakpoints()) {
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testConcurrentCollection();
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}
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}
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}
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