292 lines
10 KiB
Java
292 lines
10 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 != "Epsilon"
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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.TestReferenceRefersTo
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*/
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import java.lang.ref.PhantomReference;
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import java.lang.ref.Reference;
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import java.lang.ref.ReferenceQueue;
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import java.lang.ref.WeakReference;
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import jdk.test.whitebox.WhiteBox;
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public class TestReferenceRefersTo {
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private static final WhiteBox WB = WhiteBox.getWhiteBox();
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private static final class TestObject {
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public final int value;
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public TestObject(int value) {
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this.value = value;
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}
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}
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private static volatile TestObject testObjectNone = null;
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private static volatile TestObject testObject1 = null;
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private static volatile TestObject testObject2 = null;
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private static volatile TestObject testObject3 = null;
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private static volatile TestObject testObject4 = null;
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private static ReferenceQueue<TestObject> queue = null;
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private static PhantomReference<TestObject> testPhantom1 = null;
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private static WeakReference<TestObject> testWeak2 = null;
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private static WeakReference<TestObject> testWeak3 = null;
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private static WeakReference<TestObject> testWeak4 = null;
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private static void setup() {
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testObjectNone = new TestObject(0);
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testObject1 = new TestObject(1);
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testObject2 = new TestObject(2);
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testObject3 = new TestObject(3);
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testObject4 = new TestObject(4);
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queue = new ReferenceQueue<TestObject>();
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testPhantom1 = new PhantomReference<TestObject>(testObject1, queue);
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testWeak2 = new WeakReference<TestObject>(testObject2, queue);
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testWeak3 = new WeakReference<TestObject>(testObject3, queue);
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testWeak4 = new WeakReference<TestObject>(testObject4, queue);
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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(testObjectNone);
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gcUntilOld(testObject1);
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gcUntilOld(testObject2);
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gcUntilOld(testObject3);
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gcUntilOld(testObject4);
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gcUntilOld(testPhantom1);
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gcUntilOld(testWeak2);
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gcUntilOld(testWeak3);
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gcUntilOld(testWeak4);
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}
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private static void progress(String msg) {
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System.out.println(msg);
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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 expectCleared(Reference<TestObject> ref,
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String which) throws Exception {
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expectNotValue(ref, testObjectNone, which);
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if (!ref.refersTo(null)) {
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fail("expected " + which + " to be cleared");
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}
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}
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private static void expectNotCleared(Reference<TestObject> ref,
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String which) throws Exception {
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expectNotValue(ref, testObjectNone, which);
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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<TestObject> ref,
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TestObject value,
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String which) throws Exception {
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expectNotValue(ref, testObjectNone, which);
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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 expectNotValue(Reference<TestObject> ref,
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TestObject value,
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String which) throws Exception {
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if (ref.refersTo(value)) {
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fail(which + " refers to unexpected value");
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}
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}
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private static void checkInitialStates() throws Exception {
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expectValue(testPhantom1, testObject1, "testPhantom1");
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expectValue(testWeak2, testObject2, "testWeak2");
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expectValue(testWeak3, testObject3, "testWeak3");
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expectValue(testWeak4, testObject4, "testWeak4");
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}
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private static void discardStrongReferences() {
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// testObjectNone not dropped
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testObject1 = null;
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testObject2 = null;
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// testObject3 not dropped
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testObject4 = null;
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}
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private static void testConcurrentCollection() throws Exception {
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progress("setup concurrent collection test");
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setup();
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progress("gcUntilOld");
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gcUntilOld();
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progress("acquire control of concurrent cycles");
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WB.concurrentGCAcquireControl();
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try {
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progress("check initial states");
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checkInitialStates();
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progress("discard strong references");
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discardStrongReferences();
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progress("run GC to before marking completed");
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WB.concurrentGCRunTo(WB.BEFORE_MARKING_COMPLETED);
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progress("fetch test objects, possibly keeping some alive");
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expectNotCleared(testPhantom1, "testPhantom1");
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expectNotCleared(testWeak2, "testWeak2");
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expectValue(testWeak3, testObject3, "testWeak3");
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// For some collectors, calling get() will keep testObject4 alive.
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if (testWeak4.get() == null) {
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fail("testWeak4 unexpectedly == null");
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}
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progress("finish collection");
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WB.concurrentGCRunToIdle();
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progress("verify expected clears");
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expectCleared(testPhantom1, "testPhantom1");
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expectCleared(testWeak2, "testWeak2");
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expectValue(testWeak3, testObject3, "testWeak3");
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progress("verify get returns expected values");
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if (testWeak2.get() != null) {
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fail("testWeak2.get() != null");
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}
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TestObject obj3 = testWeak3.get();
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if (obj3 == null) {
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fail("testWeak3.get() returned null");
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} else if (obj3.value != 3) {
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fail("testWeak3.get().value is " + obj3.value);
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}
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TestObject obj4 = testWeak4.get();
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progress("verify queue entries");
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long timeout = 60000; // 1 minute of milliseconds.
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while (true) {
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Reference<? extends TestObject> ref = queue.remove(timeout);
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if (ref == null) {
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break;
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} else if (ref == testPhantom1) {
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testPhantom1 = null;
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} else if (ref == testWeak2) {
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testWeak2 = null;
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} else if (ref == testWeak3) {
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testWeak3 = null;
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} else if (ref == testWeak4) {
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testWeak4 = null;
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} else {
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fail("unexpected reference in queue");
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}
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}
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if (testPhantom1 != null) {
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fail("testPhantom1 not notified");
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} else if (testWeak2 != null) {
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fail("testWeak2 not notified");
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} else if (testWeak3 == null) {
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fail("testWeak3 notified");
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}
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if ((testWeak4 == null) != (obj4 == null)) {
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fail("either referent is cleared and we got notified, or neither of this happened: referent: "
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+ obj4 + ", notified: " + (testWeak4 == null));
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}
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} finally {
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progress("release control of concurrent cycles");
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WB.concurrentGCReleaseControl();
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}
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progress("finished concurrent collection test");
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}
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private static void testSimpleCollection() throws Exception {
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progress("setup simple collection test");
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setup();
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progress("gcUntilOld");
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gcUntilOld();
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progress("check initial states");
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checkInitialStates();
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progress("discard strong references");
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TestObject tw4 = testWeak4.get(); // Keep testObject4 alive.
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discardStrongReferences();
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progress("collect garbage");
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WB.fullGC();
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progress("verify expected clears");
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expectCleared(testPhantom1, "testPhantom1");
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expectCleared(testWeak2, "testWeak2");
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expectValue(testWeak3, testObject3, "testWeak3");
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expectNotCleared(testWeak4, "testWeak4");
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progress("verify get returns expected values");
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if (testWeak2.get() != null) {
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fail("testWeak2.get() != null");
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} else if (testWeak3.get() != testObject3) {
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fail("testWeak3.get() is not expected value");
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} else if (testWeak4.get() != tw4) {
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fail("testWeak4.get() is not expected value");
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}
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progress("finished simple collection test");
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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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testSimpleCollection();
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}
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}
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