1 /* 2 * Copyright (c) 2014, 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 * @test LFGarbageCollectedTest 26 * @bug 8046703 27 * @summary Test verifies that lambda forms are garbage collected 28 * @author kshefov 29 * @library /lib/testlibrary/jsr292 /lib/testlibrary 30 * @build TestMethods 31 * @build LambdaFormTestCase 32 * @build LFGarbageCollectedTest 33 * @run main/othervm LFGarbageCollectedTest 34 */ 35 36 import java.lang.invoke.MethodHandle; 37 import java.lang.ref.PhantomReference; 38 import java.lang.ref.ReferenceQueue; 39 import java.lang.reflect.InvocationTargetException; 40 import java.util.EnumSet; 41 import java.util.Map; 42 43 /** 44 * Lambda forms garbage collection test class. 45 */ 46 public final class LFGarbageCollectedTest extends LambdaFormTestCase { 47 48 /** 49 * Constructor for a lambda forms garbage collection test case. 50 * 51 * @param testMethod A method from {@code j.l.i.MethodHandles} class that 52 * returns a {@code j.l.i.MethodHandle} instance. 53 */ 54 public LFGarbageCollectedTest(TestMethods testMethod) { 55 super(testMethod); 56 } 57 58 @Override 59 public void doTest() { 60 try { 61 Map<String, Object> data = getTestMethod().getTestCaseData(); 62 MethodHandle adapter; 63 try { 64 adapter = getTestMethod().getTestCaseMH(data, TestMethods.Kind.ONE); 65 } catch (NoSuchMethodException ex) { 66 throw new Error("Unexpected exception: ", ex); 67 } 68 Object lambdaForm = LambdaFormTestCase.INTERNAL_FORM.invoke(adapter); 69 if (lambdaForm == null) { 70 throw new Error("Unexpected error: Lambda form of the method handle is null"); 71 } 72 ReferenceQueue rq = new ReferenceQueue(); 73 PhantomReference ph = new PhantomReference(lambdaForm, rq); 74 lambdaForm = null; 75 data = null; 76 adapter = null; 77 for (int i = 0; i < 1000 && !ph.isEnqueued(); i++) { 78 System.gc(); 79 } 80 if (!ph.isEnqueued()) { 81 throw new AssertionError("Error: Lambda form is not garbage collected"); 82 } 83 } catch (IllegalAccessException | IllegalArgumentException | 84 InvocationTargetException ex) { 85 throw new Error("Unexpected exception: ", ex); 86 } 87 } 88 89 /** 90 * Main routine for lambda forms garbage collection test. 91 * 92 * @param args Accepts no arguments. 93 */ 94 public static void main(String[] args) { 95 // The "identity", "constant", "arrayElementGetter" and "arrayElementSetter" 96 // methods should be removed from this test, 97 // because their lambda forms are stored in a static field and are not GC'ed. 98 // There can be only a finite number of such LFs for each method, 99 // so no memory leak happens. 100 EnumSet<TestMethods> testMethods = EnumSet.complementOf(EnumSet.of( 101 TestMethods.IDENTITY, 102 TestMethods.CONSTANT, 103 TestMethods.ARRAY_ELEMENT_GETTER, 104 TestMethods.ARRAY_ELEMENT_SETTER)); 105 LambdaFormTestCase.runTests(LFGarbageCollectedTest::new, testMethods); 106 } 107 }