Mercurial > hg > graal-compiler
view test/runtime/ClassUnload/KeepAliveClass.java @ 20997:370dbf93f0ca
Merge
author | Stefan Anzinger <stefan.anzinger@oracle.com> |
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date | Thu, 16 Apr 2015 20:08:18 +0200 |
parents | 33bcd9ead1d5 |
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/* * Copyright (c) 2013, 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 KeepAliveClass * @summary This test case uses a java.lang.Class instance to keep a class alive. * @library /testlibrary /testlibrary/whitebox /runtime/testlibrary * @library classes * @build KeepAliveClass test.Empty * @build ClassUnloadCommon * @run main ClassFileInstaller sun.hotspot.WhiteBox * @run main/othervm -Xbootclasspath/a:. -Xmn8m -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI KeepAliveClass */ import java.lang.ref.SoftReference; import sun.hotspot.WhiteBox; /** * Test that verifies that classes are not unloaded when specific types of references are kept to them. */ public class KeepAliveClass { private static final String className = "test.Empty"; private static final WhiteBox wb = WhiteBox.getWhiteBox(); public static Object escape = null; public static void main(String... args) throws Exception { ClassLoader cl = ClassUnloadCommon.newClassLoader(); Class<?> c = cl.loadClass(className); Object o = c.newInstance(); o = null; cl = null; escape = c; { boolean isAlive = wb.isClassAlive(className); System.out.println("testClass (1) alive: " + isAlive); ClassUnloadCommon.failIf(!isAlive, "should be alive"); } ClassUnloadCommon.triggerUnloading(); { boolean isAlive = wb.isClassAlive(className); System.out.println("testClass (2) alive: " + isAlive); ClassUnloadCommon.failIf(!isAlive, "should be alive"); } c = null; escape = null; ClassUnloadCommon.triggerUnloading(); { boolean isAlive = wb.isClassAlive(className); System.out.println("testClass (3) alive: " + isAlive); ClassUnloadCommon.failIf(isAlive, "should be unloaded"); } } }