1 /* 2 * Copyright (c) 2010, 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. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 25 /* 26 * @test 27 * @modules java.base/jdk.internal.misc 28 * 29 * @summary converted from VM Testbase vm/mlvm/anonloader/func/isGarbageCollected. 30 * VM Testbase keywords: [feature_mlvm] 31 * VM Testbase readme: 32 * DESCRIPTION 33 * Load an anonymous class, drop all references to it and verify that it is collected 34 * by GC afterwards (call System.gc() just in case). PhantomReference is used to 35 * check that the anonymous class is gone. 36 * 37 * @library /vmTestbase 38 * /test/lib 39 * @run driver jdk.test.lib.FileInstaller . . 40 * 41 * @comment build test class and indify classes 42 * @build vm.mlvm.anonloader.func.isGarbageCollected.Test 43 * @run driver vm.mlvm.share.IndifiedClassesBuilder 44 * 45 * @run main/othervm vm.mlvm.anonloader.func.isGarbageCollected.Test 46 */ 47 48 package vm.mlvm.anonloader.func.isGarbageCollected; 49 50 import java.lang.ref.PhantomReference; 51 import java.lang.ref.Reference; 52 import java.lang.ref.ReferenceQueue; 53 54 import vm.mlvm.anonloader.share.AnonkTestee01; 55 import vm.mlvm.share.MlvmTest; 56 import vm.share.FileUtils; 57 import vm.share.UnsafeAccess; 58 59 public class Test extends MlvmTest { 60 private static final Class<?> PARENT = AnonkTestee01.class; 61 62 public boolean run() throws Exception { 63 ReferenceQueue<Class<?>> refQueue = new ReferenceQueue<Class<?>>(); 64 PhantomReference<Class<?>> anonClassRef = createClass(refQueue); 65 System.gc(); 66 Reference<? extends Class<?>> deletedObject = refQueue.remove(); 67 return anonClassRef.equals(deletedObject); 68 } 69 70 // a private method is great to keep anonClass reference local to make it GCed on the next cycle 71 private PhantomReference<Class<?>> createClass(ReferenceQueue<Class<?>> refQueue) throws Exception { 72 byte[] classBytes = FileUtils.readClass(PARENT.getName()); 73 Class<?> anonClass = UnsafeAccess.unsafe.defineAnonymousClass(PARENT, 74 classBytes, null); 75 return new PhantomReference<Class<?>>(anonClass, refQueue); 76 } 77 78 public static void main(String[] args) { MlvmTest.launch(args); } 79 }