151 lines
4.9 KiB
Java
151 lines
4.9 KiB
Java
/*
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* Copyright (c) 2007, 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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/*
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* @test
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* @key stress randomness
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*
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* @summary converted from VM Testbase gc/gctests/WeakReference/weak006.
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* VM Testbase keywords: [gc, stress, stressopt, nonconcurrent]
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*
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* @library /vmTestbase
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* /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 -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:+IgnoreUnrecognizedVMOptions -XX:-ScavengeBeforeFullGC gc.gctests.WeakReference.weak006.weak006 -t 1
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*/
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package gc.gctests.WeakReference.weak006;
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import jdk.test.whitebox.WhiteBox;
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import nsk.share.test.*;
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import nsk.share.gc.*;
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import nsk.share.TestFailure;
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import java.lang.ref.WeakReference;
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import java.lang.ref.SoftReference;
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import java.lang.ref.PhantomReference;
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import java.lang.ref.Reference;
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/**
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* Test that GC correctly clears references.
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*
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* This test randomly creates a number of weak, soft,
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* phantom and strong references, each of which points
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* to the next, then provokes GC with WB.fullGC().
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* The test succedes if last reference has been cleared.
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*/
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class MySoftReference<T> extends SoftReference<T> {
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public MySoftReference(T obj) {
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super(obj);
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}
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}
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class MyWeakReference<T> extends WeakReference<T> {
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public MyWeakReference(T obj) {
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super(obj);
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}
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}
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public class weak006 extends ThreadedGCTest {
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class Worker implements Runnable {
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private int length;
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private int objectSize = 100;
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private Object[] references;
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private Reference lastReference;
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private Reference<Object> makeReference(int n, Object o) {
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switch (n) {
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case 0:
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return new MyWeakReference(o);
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case 1:
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return new MySoftReference(o);
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default:
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throw new RuntimeException("Incorrect reference type");
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}
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}
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private void clear() {
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lastReference = null;
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references[length - 1] = null;
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}
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private void makeReferences(int n) {
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clear();
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MemoryObject obj = new MemoryObject(objectSize);
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references[0] = new MyWeakReference(obj);
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for (int i = 1; i < length; ++i) {
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if (i != length - 1) {
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references[i] = makeReference(LocalRandom.nextInt(2), references[i - 1]);
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} else {
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lastReference = makeReference(n, references[i - 1]);
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references[i] = lastReference;
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}
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}
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for (int i = 0; i < length; ++i) {
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references[i] = null;
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}
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}
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public void run() {
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makeReferences(0);
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ExecutionController stresser = getExecutionController();
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WhiteBox.getWhiteBox().fullGC();
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if (!stresser.continueExecution()) {
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return;
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}
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if (lastReference.get() != null) {
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references = null;
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throw new TestFailure("Last weak reference has not been cleared");
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}
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makeReferences(1);
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WhiteBox.getWhiteBox().fullGC();
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if (!stresser.continueExecution()) {
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return;
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}
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if (lastReference.get() != null) {
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references = null;
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throw new TestFailure("Last soft reference has not been cleared");
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}
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}
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public Worker() {
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length = Memory.getArrayLength(runParams.getTestMemory() - objectSize, Memory.getReferenceSize() + objectSize);
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System.out.println("Array size: " + length);
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references = new Object[length];
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}
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}
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@Override
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protected Runnable createRunnable(int i) {
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return new Worker();
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}
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public static void main(String[] args) {
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GC.runTest(new weak006(), args);
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}
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}
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