142 lines
5.8 KiB
Java
142 lines
5.8 KiB
Java
/*
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* Copyright (c) 2020, 2022, 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
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* @summary Test unloading of hidden classes.
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* @modules java.management
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* @library /test/lib /
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* @build jdk.test.whitebox.WhiteBox
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* @run driver jdk.test.lib.helpers.ClassFileInstaller jdk.test.whitebox.WhiteBox
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*
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* @run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI
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* -XX:-BackgroundCompilation
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* compiler.classUnloading.hiddenClass.TestHiddenClassUnloading
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*/
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package compiler.classUnloading.hiddenClass;
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import jdk.test.whitebox.WhiteBox;
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import java.io.IOException;
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import java.lang.invoke.MethodHandles;
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import java.lang.invoke.MethodHandles.Lookup;
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import static java.lang.invoke.MethodHandles.Lookup.ClassOption.*;
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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 TestHiddenClassUnloading {
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private static final WhiteBox WHITE_BOX = WhiteBox.getWhiteBox();
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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 TestHiddenClassUnloading).
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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 hiddenClass.
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* @param hiddenClass Class performing some work (will be unloaded)
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*/
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static private void doWork(Class<?> hiddenClass) throws InstantiationException, IllegalAccessException {
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// Create a new instance
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Object anon = hiddenClass.newInstance();
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// We would like to call a method of hiddenClass 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 hiddenClass::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) A hidden version of TestHiddenClassUnloading is loaded by a custom class loader
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* (2) The method doWork that calls a method of the hidden class is compiled. The call
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* is implemented as an IC referencing Klass* metadata of the hidden class.
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* (3) Unloading of the hidden 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 a hidden version of this class using method lookup.defineHiddenClass().
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String rn = TestHiddenClassUnloading.class.getSimpleName() + ".class";
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URL classUrl = TestHiddenClassUnloading.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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Lookup lookup = MethodHandles.lookup();
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Class<?> hiddenClass = lookup.defineHiddenClass(classBytes, true, NESTMATE).lookupClass();
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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(hiddenClass);
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}
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// Make sure doWork is compiled now
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Method doWork = TestHiddenClassUnloading.class.getDeclaredMethod("doWork", Class.class);
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makeSureIsCompiled(doWork);
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// (3) Throw away reference to hiddenClass to allow unloading
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hiddenClass = null;
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// Force garbage collection to trigger unloading of hiddenClass
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WHITE_BOX.fullGC();
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}
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}
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