1 /*
2 * Copyright (c) 2014, 2015, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 */
23
24 /*
25 * @test
26 * @bug 8076110
27 * @summary Redefine running methods that have cached resolution errors
28 * @library /testlibrary
29 * @modules java.base/jdk.internal.org.objectweb.asm
30 * java.instrument
31 * jdk.jartool/sun.tools.jar
32 * @build RedefineClassHelper
33 * @run main RedefineClassHelper
34 * @run main/othervm -javaagent:redefineagent.jar -XX:TraceRedefineClasses=0x600 RedefineRunningMethodsWithResolutionErrors
35 */
36
37 import jdk.internal.org.objectweb.asm.ClassWriter;
38 import jdk.internal.org.objectweb.asm.Label;
39 import jdk.internal.org.objectweb.asm.MethodVisitor;
40 import jdk.internal.org.objectweb.asm.Opcodes;
41
42 import java.lang.reflect.InvocationTargetException;
43
44 public class RedefineRunningMethodsWithResolutionErrors extends ClassLoader implements Opcodes {
45
46 @Override
47 protected Class<?> findClass(String name) throws ClassNotFoundException {
48 if (name.equals("C")) {
49 byte[] b = loadC(false);
50 return defineClass(name, b, 0, b.length);
51 } else {
52 return super.findClass(name);
53 }
54 }
55
56 private static byte[] loadC(boolean redefine) {
57 ClassWriter cw = new ClassWriter(0);
58
59 cw.visit(52, ACC_SUPER | ACC_PUBLIC, "C", null, "java/lang/Object", null);
60 {
61 MethodVisitor mv;
62
63 mv = cw.visitMethod(ACC_PUBLIC | ACC_STATIC, "m", "()V", null, null);
64 mv.visitCode();
65
66 // First time we run we will:
67 // 1) Cache resolution errors
68 // 2) Redefine the class / method
69 // 3) Try to read the resolution errors that were cached
70 //
71 // The redefined method will never run, throw error to be sure
72 if (redefine) {
73 createThrowRuntimeExceptionCode(mv, "The redefined method was called");
74 } else {
75 createMethodBody(mv);
76 }
77 mv.visitMaxs(3, 0);
78 mv.visitEnd();
79 }
80 cw.visitEnd();
81 return cw.toByteArray();
82 }
83
84 private static void createMethodBody(MethodVisitor mv) {
85 Label classExists = new Label();
86
87 // Cache resolution errors
88 createLoadNonExistentClassCode(mv, classExists);
89
90 // Redefine our own class and method
91 mv.visitMethodInsn(INVOKESTATIC, "RedefineRunningMethodsWithResolutionErrors", "redefine", "()V");
92
93 // Provoke the same error again to make sure the resolution error cache works
94 createLoadNonExistentClassCode(mv, classExists);
95
96 // Test passed
97 mv.visitInsn(RETURN);
98
99 mv.visitFrame(F_SAME, 0, new Object[0], 0, new Object[0]);
100 mv.visitLabel(classExists);
101
102 createThrowRuntimeExceptionCode(mv, "Loaded class that shouldn't exist (\"NonExistentClass\")");
103 }
104
105 private static void createLoadNonExistentClassCode(MethodVisitor mv, Label classExists) {
106 Label tryLoadBegin = new Label();
107 Label tryLoadEnd = new Label();
108 Label catchLoadBlock = new Label();
109 mv.visitTryCatchBlock(tryLoadBegin, tryLoadEnd, catchLoadBlock, "java/lang/NoClassDefFoundError");
110
111 // Try to load a class that does not exist to provoke resolution errors
112 mv.visitLabel(tryLoadBegin);
113 mv.visitMethodInsn(INVOKESTATIC, "NonExistentClass", "nonExistentMethod", "()V");
114 mv.visitLabel(tryLoadEnd);
115
116 // No NoClassDefFoundError means NonExistentClass existed, which shouldn't happen
117 mv.visitJumpInsn(GOTO, classExists);
118
119 mv.visitFrame(F_SAME1, 0, new Object[0], 1, new Object[] { "java/lang/NoClassDefFoundError" });
120 mv.visitLabel(catchLoadBlock);
121
122 // Ignore the expected NoClassDefFoundError
123 mv.visitInsn(POP);
124 }
125
126 private static void createThrowRuntimeExceptionCode(MethodVisitor mv, String msg) {
127 mv.visitTypeInsn(NEW, "java/lang/RuntimeException");
128 mv.visitInsn(DUP);
129 mv.visitLdcInsn(msg);
130 mv.visitMethodInsn(INVOKESPECIAL, "java/lang/RuntimeException", "<init>", "(Ljava/lang/String;)V");
131 mv.visitInsn(ATHROW);
132 }
133
134 private static Class<?> c;
135
136 public static void redefine() throws Exception {
137 RedefineClassHelper.redefineClass(c, loadC(true));
138 }
139
140 public static void main(String[] args) throws ClassNotFoundException, NoSuchMethodException, IllegalAccessException, InvocationTargetException {
141 c = Class.forName("C", true, new RedefineRunningMethodsWithResolutionErrors());
142 c.getMethod("m").invoke(null);
143 }
144 }