146 lines
5.5 KiB
Java
146 lines
5.5 KiB
Java
/*
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* Copyright (c) 2014, 2019, 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 8076110
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* @summary Redefine running methods that have cached resolution errors
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* @requires vm.jvmti
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* @library /test/lib
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* @modules java.base/jdk.internal.misc
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* @modules java.base/jdk.internal.org.objectweb.asm
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* java.instrument
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* jdk.jartool/sun.tools.jar
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* @run main RedefineClassHelper
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* @run main/othervm -javaagent:redefineagent.jar -Xlog:redefine+class+iklass+add=trace,redefine+class+iklass+purge=trace RedefineRunningMethodsWithResolutionErrors
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*/
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import jdk.internal.org.objectweb.asm.ClassWriter;
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import jdk.internal.org.objectweb.asm.Label;
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import jdk.internal.org.objectweb.asm.MethodVisitor;
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import jdk.internal.org.objectweb.asm.Opcodes;
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import java.lang.reflect.InvocationTargetException;
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public class RedefineRunningMethodsWithResolutionErrors extends ClassLoader implements Opcodes {
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@Override
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protected Class<?> findClass(String name) throws ClassNotFoundException {
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if (name.equals("C")) {
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byte[] b = loadC(false);
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return defineClass(name, b, 0, b.length);
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} else {
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return super.findClass(name);
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}
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}
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private static byte[] loadC(boolean redefine) {
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ClassWriter cw = new ClassWriter(0);
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cw.visit(52, ACC_SUPER | ACC_PUBLIC, "C", null, "java/lang/Object", null);
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{
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MethodVisitor mv;
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mv = cw.visitMethod(ACC_PUBLIC | ACC_STATIC, "m", "()V", null, null);
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mv.visitCode();
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// First time we run we will:
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// 1) Cache resolution errors
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// 2) Redefine the class / method
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// 3) Try to read the resolution errors that were cached
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//
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// The redefined method will never run, throw error to be sure
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if (redefine) {
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createThrowRuntimeExceptionCode(mv, "The redefined method was called");
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} else {
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createMethodBody(mv);
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}
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mv.visitMaxs(3, 0);
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mv.visitEnd();
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}
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cw.visitEnd();
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return cw.toByteArray();
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}
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private static void createMethodBody(MethodVisitor mv) {
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Label classExists = new Label();
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// Cache resolution errors
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createLoadNonExistentClassCode(mv, classExists);
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// Redefine our own class and method
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mv.visitMethodInsn(INVOKESTATIC, "RedefineRunningMethodsWithResolutionErrors", "redefine", "()V");
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// Provoke the same error again to make sure the resolution error cache works
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createLoadNonExistentClassCode(mv, classExists);
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// Test passed
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mv.visitInsn(RETURN);
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mv.visitFrame(F_SAME, 0, new Object[0], 0, new Object[0]);
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mv.visitLabel(classExists);
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createThrowRuntimeExceptionCode(mv, "Loaded class that shouldn't exist (\"NonExistentClass\")");
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}
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private static void createLoadNonExistentClassCode(MethodVisitor mv, Label classExists) {
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Label tryLoadBegin = new Label();
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Label tryLoadEnd = new Label();
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Label catchLoadBlock = new Label();
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mv.visitTryCatchBlock(tryLoadBegin, tryLoadEnd, catchLoadBlock, "java/lang/NoClassDefFoundError");
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// Try to load a class that does not exist to provoke resolution errors
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mv.visitLabel(tryLoadBegin);
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mv.visitMethodInsn(INVOKESTATIC, "NonExistentClass", "nonExistentMethod", "()V");
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mv.visitLabel(tryLoadEnd);
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// No NoClassDefFoundError means NonExistentClass existed, which shouldn't happen
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mv.visitJumpInsn(GOTO, classExists);
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mv.visitFrame(F_SAME1, 0, new Object[0], 1, new Object[] { "java/lang/NoClassDefFoundError" });
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mv.visitLabel(catchLoadBlock);
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// Ignore the expected NoClassDefFoundError
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mv.visitInsn(POP);
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}
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private static void createThrowRuntimeExceptionCode(MethodVisitor mv, String msg) {
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mv.visitTypeInsn(NEW, "java/lang/RuntimeException");
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mv.visitInsn(DUP);
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mv.visitLdcInsn(msg);
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mv.visitMethodInsn(INVOKESPECIAL, "java/lang/RuntimeException", "<init>", "(Ljava/lang/String;)V");
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mv.visitInsn(ATHROW);
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}
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private static Class<?> c;
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public static void redefine() throws Exception {
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RedefineClassHelper.redefineClass(c, loadC(true));
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}
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public static void main(String[] args) throws ClassNotFoundException, NoSuchMethodException, IllegalAccessException, InvocationTargetException {
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c = Class.forName("C", true, new RedefineRunningMethodsWithResolutionErrors());
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c.getMethod("m").invoke(null);
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}
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}
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