98 lines
3.6 KiB
Java
98 lines
3.6 KiB
Java
/*
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* Copyright (c) 2018, 2023, 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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* @bug 8198393
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* @summary Instrumentation.retransformClasses(new Class[0]) should be NOP
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* @requires vm.jvmti
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* @requires vm.flagless
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* @library /test/lib
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* @modules java.instrument
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* @compile RetransformClassesZeroLength.java
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* @run driver RetransformClassesZeroLength
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*/
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import java.lang.instrument.ClassFileTransformer;
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import java.lang.instrument.IllegalClassFormatException;
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import java.lang.instrument.Instrumentation;
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import java.lang.instrument.UnmodifiableClassException;
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import java.nio.file.Files;
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import java.nio.file.Path;
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import java.nio.file.Paths;
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import java.security.ProtectionDomain;
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import jdk.test.lib.process.ProcessTools;
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import jdk.test.lib.helpers.ClassFileInstaller;
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public class RetransformClassesZeroLength {
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private static String manifest =
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"Premain-Class: " + RetransformClassesZeroLength.Agent.class.getName() + "\n"
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+ "Can-Retransform-Classes: true\n";
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private static String CP = System.getProperty("test.classes");
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public static void main(String args[]) throws Throwable {
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String agentJar = buildAgent();
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ProcessTools.executeProcess(
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ProcessTools.createLimitedTestJavaProcessBuilder(
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"-javaagent:" + agentJar,
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"-version")
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).shouldHaveExitValue(0);
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}
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private static String buildAgent() throws Exception {
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Path jar = Files.createTempFile(Paths.get("."), null, ".jar");
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String jarPath = jar.toAbsolutePath().toString();
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ClassFileInstaller.writeJar(jarPath,
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ClassFileInstaller.Manifest.fromString(manifest),
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RetransformClassesZeroLength.class.getName());
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return jarPath;
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}
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public static class Agent implements ClassFileTransformer {
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public static void premain(String args, Instrumentation inst) {
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inst.addTransformer(new NoOpTransformer());
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try {
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inst.retransformClasses(new Class[0]);
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} catch (UnmodifiableClassException ex) {
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throw new AssertionError(ex);
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}
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}
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}
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private static class NoOpTransformer implements ClassFileTransformer {
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@Override
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public byte[] transform(ClassLoader loader,
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String className,
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Class<?> classBeingRedefined,
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ProtectionDomain protectionDomain,
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byte[] classfileBuffer
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) throws IllegalClassFormatException {
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return null; // no transform
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}
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}
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}
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