/* * Copyright (c) 2014, 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 LFGarbageCollectedTest * @bug 8046703 * @summary Test verifies that lambda forms are garbage collected * @author kshefov * @ignore 8057020 * @library /lib/testlibrary/jsr292 /lib/testlibrary * @build TestMethods * @build LambdaFormTestCase * @build LFGarbageCollectedTest * @run main/othervm/timeout=600 -DtestLimit=150 LFGarbageCollectedTest */ import java.lang.invoke.MethodHandle; import java.lang.ref.PhantomReference; import java.lang.ref.ReferenceQueue; import java.lang.reflect.InvocationTargetException; import java.util.EnumSet; import java.util.Map; /** * Lambda forms garbage collection test class. */ public final class LFGarbageCollectedTest extends LambdaFormTestCase { /** * Constructor for a lambda forms garbage collection test case. * * @param testMethod A method from {@code j.l.i.MethodHandles} class that * returns a {@code j.l.i.MethodHandle} instance. */ public LFGarbageCollectedTest(TestMethods testMethod) { super(testMethod); } @Override public void doTest() { try { Map data = getTestMethod().getTestCaseData(); MethodHandle adapter; try { adapter = getTestMethod().getTestCaseMH(data, TestMethods.Kind.ONE); } catch (NoSuchMethodException ex) { throw new Error("Unexpected exception: ", ex); } Object lambdaForm = LambdaFormTestCase.INTERNAL_FORM.invoke(adapter); if (lambdaForm == null) { throw new Error("Unexpected error: Lambda form of the method handle is null"); } ReferenceQueue rq = new ReferenceQueue(); PhantomReference ph = new PhantomReference(lambdaForm, rq); lambdaForm = null; data = null; adapter = null; for (int i = 0; i < 1000 && !ph.isEnqueued(); i++) { System.gc(); } if (!ph.isEnqueued()) { throw new AssertionError("Error: Lambda form is not garbage collected"); } } catch (IllegalAccessException | IllegalArgumentException | InvocationTargetException ex) { throw new Error("Unexpected exception: ", ex); } } /** * Main routine for lambda forms garbage collection test. * * @param args Accepts no arguments. */ public static void main(String[] args) { // The "identity", "constant", "arrayElementGetter" and "arrayElementSetter" // methods should be removed from this test, // because their lambda forms are stored in a static field and are not GC'ed. // There can be only a finite number of such LFs for each method, // so no memory leak happens. EnumSet testMethods = EnumSet.complementOf(EnumSet.of( TestMethods.IDENTITY, TestMethods.CONSTANT, TestMethods.ARRAY_ELEMENT_GETTER, TestMethods.ARRAY_ELEMENT_SETTER)); LambdaFormTestCase.runTests(LFGarbageCollectedTest::new, testMethods); } }