1 /* 2 * Copyright (c) 2016, 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 8058575 27 * @summary Test that bad host classes cause exceptions to get thrown. 28 * @modules java.base/jdk.internal.misc 29 * java.base/jdk.internal.org.objectweb.asm 30 * @run main TestBadHostClass 31 */ 32 33 34 import java.lang.*; 35 import java.lang.reflect.Field; 36 import jdk.internal.misc.Unsafe; 37 import jdk.internal.org.objectweb.asm.ClassWriter; 38 import static jdk.internal.org.objectweb.asm.Opcodes.*; 39 40 // Test that bad host classes cause exceptions. 41 public class TestBadHostClass { 42 43 private static final Unsafe unsafe = Unsafe.getUnsafe(); 44 45 private static String packageName(Class<?> c) { 46 if (c.isArray()) { 47 return packageName(c.getComponentType()); 48 } else { 49 String name = c.getName(); 50 int dot = name.lastIndexOf('.'); 51 if (dot == -1) return ""; 52 return name.substring(0, dot); 53 } 54 } 55 56 private static int constantPoolSize(byte[] classFile) { 57 return ((classFile[8] & 0xFF) << 8) | (classFile[9] & 0xFF); 58 } 59 60 static public void badHostClass(Class<?> hostClass) { 61 // choose a class name in the same package as the host class 62 String className; 63 if (hostClass != null) { 64 String prefix = packageName(hostClass); 65 if (prefix.length() > 0) 66 prefix = prefix.replace('.', '/') + "/"; 67 className = prefix + "Anon"; 68 } else { 69 className = "Anon"; 70 } 71 72 // create the class 73 String superName = "java/lang/Object"; 74 ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS 75 + ClassWriter.COMPUTE_FRAMES); 76 cw.visit(V1_8, ACC_PUBLIC + ACC_FINAL + ACC_SUPER, 77 className, null, superName, null); 78 byte[] classBytes = cw.toByteArray(); 79 int cpPoolSize = constantPoolSize(classBytes); 80 Class<?> anonClass 81 = unsafe.defineAnonymousClass(hostClass, classBytes, new Object[cpPoolSize]); 82 } 83 84 public static void main(String args[]) throws Exception { 85 // host class is an array of java.lang.Objects. 86 try { 87 badHostClass(Object[].class); 88 } catch (IllegalArgumentException ex) { 89 } 90 91 // host class is an array of objects of this class. 92 try { 93 badHostClass(TestBadHostClass[].class); 94 } catch (IllegalArgumentException ex) { 95 } 96 97 // host class is null. 98 try { 99 badHostClass(null); 100 } catch (NullPointerException ex) { 101 } 102 103 // host class is a primitive array class. 104 try { 105 badHostClass(int[].class); 106 } catch (IllegalArgumentException ex) { 107 } 108 } 109 }