Mercurial > hg > truffle
diff test/compiler/classUnloading/methodUnloading/TestMethodUnloading.java @ 21817:12478c5eb000
Merge
author | asaha |
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date | Fri, 24 Oct 2014 17:09:30 -0700 |
parents | d2c5fee67143 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/test/compiler/classUnloading/methodUnloading/TestMethodUnloading.java Fri Oct 24 17:09:30 2014 -0700 @@ -0,0 +1,145 @@ +/* + * 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. + */ + +import sun.hotspot.WhiteBox; + +import java.lang.reflect.Method; +import java.net.URL; +import java.net.URLClassLoader; + +/* + * @test MethodUnloadingTest + * @bug 8029443 + * @summary "Tests the unloading of methods to to class unloading" + * @library /testlibrary /testlibrary/whitebox + * @build TestMethodUnloading + * @build WorkerClass + * @run main ClassFileInstaller sun.hotspot.WhiteBox + * @run main/othervm -Xbootclasspath/a:. -XX:+IgnoreUnrecognizedVMOptions -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:-BackgroundCompilation -XX:-UseCompressedOops -XX:CompileOnly=TestMethodUnloading::doWork TestMethodUnloading + */ +public class TestMethodUnloading { + private static final String workerClassName = "WorkerClass"; + private static int work = -1; + + private static final WhiteBox WHITE_BOX = WhiteBox.getWhiteBox(); + private static int COMP_LEVEL_SIMPLE = 1; + private static int COMP_LEVEL_FULL_OPTIMIZATION = 4; + + /** + * Does some work by either using the workerClass or locally producing values. + * @param workerClass Class performing some work (will be unloaded) + * @param useWorker If true the workerClass is used + */ + static private void doWork(Class<?> workerClass, boolean useWorker) throws InstantiationException, IllegalAccessException { + if (useWorker) { + // Create a new instance + Object worker = workerClass.newInstance(); + // We would like to call a method of WorkerClass here but we cannot cast to WorkerClass + // because the class was loaded by a different class loader. One solution would be to use + // reflection but since we want C2 to implement the call as an optimized IC we call + // Object::hashCode() here which actually calls WorkerClass::hashCode(). + // C2 will then implement this call as an optimized IC that points to a to-interpreter stub + // referencing the Method* for WorkerClass::hashCode(). + work = worker.hashCode(); + if (work != 42) { + new RuntimeException("Work not done"); + } + } else { + // Do some important work here + work = 1; + } + } + + /** + * Makes sure that method is compiled by forcing compilation if not yet compiled. + * @param m Method to be checked + */ + static private void makeSureIsCompiled(Method m) { + // Make sure background compilation is disabled + if (WHITE_BOX.getBooleanVMFlag("BackgroundCompilation")) { + throw new RuntimeException("Background compilation enabled"); + } + + // Check if already compiled + if (!WHITE_BOX.isMethodCompiled(m)) { + // If not, try to compile it with C2 + if(!WHITE_BOX.enqueueMethodForCompilation(m, COMP_LEVEL_FULL_OPTIMIZATION)) { + // C2 compiler not available, try to compile with C1 + WHITE_BOX.enqueueMethodForCompilation(m, COMP_LEVEL_SIMPLE); + } + // Because background compilation is disabled, method should now be compiled + if(!WHITE_BOX.isMethodCompiled(m)) { + throw new RuntimeException(m + " not compiled"); + } + } + } + + /** + * This test creates stale Method* metadata in a to-interpreter stub of an optimized IC. + * + * The following steps are performed: + * (1) A workerClass is loaded by a custom class loader + * (2) The method doWork that calls a method of the workerClass is compiled. The call + * is implemented as an optimized IC calling a to-interpreted stub. The to-interpreter + * stub contains a Method* to a workerClass method. + * (3) Unloading of the workerClass is enforced. The to-interpreter stub now contains a dead Method*. + * (4) Depending on the implementation of the IC, the compiled version of doWork should still be + * valid. We call it again without using the workerClass. + */ + static public void main(String[] args) throws Exception { + // (1) Create a custom class loader with no parent class loader + URL url = TestMethodUnloading.class.getProtectionDomain().getCodeSource().getLocation(); + URLClassLoader loader = new URLClassLoader(new URL[] {url}, null); + + // Load worker class with custom class loader + Class<?> workerClass = Class.forName(workerClassName, true, loader); + + // (2) Make sure all paths of doWork are profiled and compiled + for (int i = 0; i < 100000; ++i) { + doWork(workerClass, true); + doWork(workerClass, false); + } + + // Make sure doWork is compiled now + Method doWork = TestMethodUnloading.class.getDeclaredMethod("doWork", Class.class, boolean.class); + makeSureIsCompiled(doWork); + + // (3) Throw away class loader and reference to workerClass to allow unloading + loader.close(); + loader = null; + workerClass = null; + + // Force garbage collection to trigger unloading of workerClass + // Dead reference to WorkerClass::hashCode triggers JDK-8029443 + WHITE_BOX.fullGC(); + + // (4) Depending on the implementation of the IC, the compiled version of doWork + // may still be valid here. Execute it without a workerClass. + doWork(null, false); + if (work != 1) { + throw new RuntimeException("Work not done"); + } + + doWork(Object.class, false); + } +}