author | alanb |
Wed, 05 Jul 2017 13:25:45 +0100 | |
changeset 45825 | 4fa7bd62eb84 |
parent 42650 | 1f304d0c888b |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2014, 2016, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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/* |
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* @test TestAnonymousClassUnloading |
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* @bug 8054402 |
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* @summary "Tests unloading of anonymous classes." |
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* @library /test/lib / |
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* @modules java.base/jdk.internal.misc |
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* |
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* @run main/othervm/bootclasspath -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI |
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* -XX:-BackgroundCompilation |
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* compiler.classUnloading.anonymousClass.TestAnonymousClassUnloading |
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*/ |
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package compiler.classUnloading.anonymousClass; |
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import jdk.internal.misc.Unsafe; |
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import sun.hotspot.WhiteBox; |
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import java.io.IOException; |
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import java.lang.reflect.Method; |
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import java.net.URL; |
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import java.net.URLConnection; |
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import compiler.whitebox.CompilerWhiteBoxTest; |
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public class TestAnonymousClassUnloading { |
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private static final WhiteBox WHITE_BOX = WhiteBox.getWhiteBox(); |
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private static final Unsafe UNSAFE = Unsafe.getUnsafe(); |
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/** |
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* We override hashCode here to be able to access this implementation |
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* via an Object reference (we cannot cast to TestAnonymousClassUnloading). |
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*/ |
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@Override |
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public int hashCode() { |
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return 42; |
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} |
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/** |
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* Does some work by using the anonymousClass. |
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* @param anonymousClass Class performing some work (will be unloaded) |
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*/ |
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static private void doWork(Class<?> anonymousClass) throws InstantiationException, IllegalAccessException { |
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// Create a new instance |
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Object anon = anonymousClass.newInstance(); |
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// We would like to call a method of anonymousClass here but we cannot cast because the class |
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// was loaded by a different class loader. One solution would be to use reflection but since |
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// we want C2 to implement the call as an IC we call Object::hashCode() here which actually |
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// calls anonymousClass::hashCode(). C2 will then implement this call as an IC. |
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if (anon.hashCode() != 42) { |
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new RuntimeException("Work not done"); |
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} |
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} |
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/** |
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* Makes sure that method is compiled by forcing compilation if not yet compiled. |
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* @param m Method to be checked |
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*/ |
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static private void makeSureIsCompiled(Method m) { |
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// Make sure background compilation is disabled |
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if (WHITE_BOX.getBooleanVMFlag("BackgroundCompilation")) { |
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throw new RuntimeException("Background compilation enabled"); |
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} |
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// Check if already compiled |
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if (!WHITE_BOX.isMethodCompiled(m)) { |
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// If not, try to compile it with C2 |
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if(!WHITE_BOX.enqueueMethodForCompilation(m, CompilerWhiteBoxTest.COMP_LEVEL_FULL_OPTIMIZATION)) { |
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// C2 compiler not available, try to compile with C1 |
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WHITE_BOX.enqueueMethodForCompilation(m, CompilerWhiteBoxTest.COMP_LEVEL_SIMPLE); |
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} |
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// Because background compilation is disabled, method should now be compiled |
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if(!WHITE_BOX.isMethodCompiled(m)) { |
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throw new RuntimeException(m + " not compiled"); |
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} |
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} |
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} |
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/** |
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* This test creates stale Klass* metadata referenced by a compiled IC. |
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* |
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* The following steps are performed: |
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* (1) An anonymous version of TestAnonymousClassUnloading is loaded by a custom class loader |
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* (2) The method doWork that calls a method of the anonymous class is compiled. The call |
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* is implemented as an IC referencing Klass* metadata of the anonymous class. |
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* (3) Unloading of the anonymous class is enforced. The IC now references dead metadata. |
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*/ |
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static public void main(String[] args) throws Exception { |
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// (1) Load an anonymous version of this class using the corresponding Unsafe method |
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String rn = TestAnonymousClassUnloading.class.getSimpleName() + ".class"; |
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URL classUrl = TestAnonymousClassUnloading.class.getResource(rn); |
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URLConnection connection = classUrl.openConnection(); |
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int length = connection.getContentLength(); |
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byte[] classBytes = connection.getInputStream().readAllBytes(); |
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if (length != -1 && classBytes.length != length) { |
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throw new IOException("Expected:" + length + ", actual: " + classBytes.length); |
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} |
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Class<?> anonymousClass = UNSAFE.defineAnonymousClass(TestAnonymousClassUnloading.class, classBytes, null); |
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// (2) Make sure all paths of doWork are profiled and compiled |
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for (int i = 0; i < 100000; ++i) { |
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doWork(anonymousClass); |
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} |
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// Make sure doWork is compiled now |
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Method doWork = TestAnonymousClassUnloading.class.getDeclaredMethod("doWork", Class.class); |
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makeSureIsCompiled(doWork); |
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// (3) Throw away reference to anonymousClass to allow unloading |
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anonymousClass = null; |
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// Force garbage collection to trigger unloading of anonymousClass |
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// Dead metadata reference to anonymousClass triggers JDK-8054402 |
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WHITE_BOX.fullGC(); |
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} |
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} |