| /* |
| * Copyright (c) 2007, 2018, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /* |
| * @test |
| * @key stress gc |
| * |
| * @summary converted from VM Testbase gc/gctests/WeakReference/weak006. |
| * VM Testbase keywords: [gc, stress, stressopt, nonconcurrent] |
| * |
| * @library /vmTestbase |
| * /test/lib |
| * @run driver jdk.test.lib.FileInstaller . . |
| * @run main/othervm -XX:-UseGCOverheadLimit gc.gctests.WeakReference.weak006.weak006 -t 1 |
| */ |
| |
| package gc.gctests.WeakReference.weak006; |
| |
| import nsk.share.test.*; |
| import nsk.share.gc.*; |
| import nsk.share.TestFailure; |
| import java.lang.ref.WeakReference; |
| import java.lang.ref.SoftReference; |
| import java.lang.ref.PhantomReference; |
| import java.lang.ref.Reference; |
| |
| /** |
| * Test that GC correctly clears references. |
| * |
| * This test randomly creates a number of weak, soft, |
| * phantom and strong references, each of which points |
| * to the next, then provokes GC with Algorithms.eatMemory(). |
| * The test succedes if last reference has been cleared. |
| */ |
| public class weak006 extends ThreadedGCTest { |
| |
| class Worker implements Runnable { |
| |
| private int length; |
| private int objectSize = 100; |
| private Object[] references; |
| private Reference lastReference; |
| |
| private Object makeReference(int n, Object o) { |
| switch (n) { |
| case 0: |
| return new WeakReference(o); |
| case 1: |
| return new SoftReference(o); |
| case 2: |
| return new PhantomReference(o, null); |
| case 4: { |
| // Array of strong references |
| int len = Memory.getArrayLength(objectSize, Memory.getReferenceSize()); |
| Object[] arr = new Object[len]; |
| for (int i = 0; i < len; ++i) { |
| arr[i] = o; |
| } |
| return arr; |
| } |
| case 5: { |
| // reference to array of strong references and strong reference to reference |
| int len = Memory.getArrayLength(objectSize, Memory.getReferenceSize()); |
| Object[] arr = new Object[len]; |
| for (int i = 1; i < len; ++i) { |
| arr[i] = o; |
| } |
| Reference ref = (Reference) makeReference(LocalRandom.nextInt(3), arr); |
| if (len > 0) { |
| arr[0] = ref; |
| } |
| return ref; |
| } |
| case 3: |
| default: |
| // Strong reference |
| return o; |
| } |
| } |
| |
| private void clear() { |
| lastReference = null; |
| references[length - 1] = null; |
| } |
| |
| private void makeReferences(int n) { |
| clear(); |
| MemoryObject obj = new MemoryObject(objectSize); |
| references[0] = new WeakReference(obj); |
| for (int i = 1; i < length; ++i) { |
| if (i != length - 1) { |
| references[i] = makeReference(LocalRandom.nextInt(2), references[i - 1]); |
| } else { |
| lastReference = (Reference) makeReference(n, references[i - 1]); |
| references[i] = lastReference; |
| } |
| } |
| for (int i = 0; i < length; ++i) { |
| references[i] = null; |
| } |
| } |
| |
| public void run() { |
| makeReferences(0); |
| ExecutionController stresser = getExecutionController(); |
| Algorithms.eatMemory(stresser); |
| if (!stresser.continueExecution()) { |
| return; |
| } |
| if (lastReference.get() != null) { |
| references = null; |
| throw new TestFailure("Last weak reference has not been cleared"); |
| } |
| makeReferences(1); |
| Algorithms.eatMemory(stresser); |
| if (!stresser.continueExecution()) { |
| return; |
| } |
| if (lastReference.get() != null) { |
| references = null; |
| throw new TestFailure("Last soft reference has not been cleared"); |
| } |
| } |
| |
| public Worker() { |
| length = Memory.getArrayLength(runParams.getTestMemory() - objectSize, Memory.getReferenceSize() + objectSize); |
| System.out.println("Array size: " + length); |
| references = new Object[length]; |
| } |
| } |
| |
| @Override |
| protected Runnable createRunnable(int i) { |
| return new Worker(); |
| } |
| |
| public static void main(String[] args) { |
| GC.runTest(new weak006(), args); |
| } |
| } |