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| 1 | +/* |
| 2 | + * Copyright Amazon.com Inc. 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 8267555 |
| 27 | + * @requires vm.jvmti |
| 28 | + * @summary Class redefinition with a different class file version |
| 29 | + * @library /test/lib |
| 30 | + * @compile TestClassOld.jasm TestClassNew.jasm |
| 31 | + * @run main RedefineClassHelper |
| 32 | + * @run main/othervm -javaagent:redefineagent.jar ClassVersionAfterRedefine |
| 33 | + */ |
| 34 | + |
| 35 | +import java.io.InputStream; |
| 36 | +import java.lang.reflect.Method; |
| 37 | + |
| 38 | +import static jdk.test.lib.Asserts.assertTrue; |
| 39 | + |
| 40 | +public class ClassVersionAfterRedefine extends ClassLoader { |
| 41 | + |
| 42 | + private static String myName = ClassVersionAfterRedefine.class.getName(); |
| 43 | + |
| 44 | + private static byte[] getBytecodes(String name) throws Exception { |
| 45 | + InputStream is = ClassVersionAfterRedefine.class.getResourceAsStream(name + ".class"); |
| 46 | + byte[] buf = is.readAllBytes(); |
| 47 | + System.out.println("sizeof(" + name + ".class) == " + buf.length); |
| 48 | + return buf; |
| 49 | + } |
| 50 | + |
| 51 | + private static int getStringIndex(String needle, byte[] buf) { |
| 52 | + return getStringIndex(needle, buf, 0); |
| 53 | + } |
| 54 | + |
| 55 | + private static int getStringIndex(String needle, byte[] buf, int offset) { |
| 56 | + outer: |
| 57 | + for (int i = offset; i < buf.length - offset - needle.length(); i++) { |
| 58 | + for (int j = 0; j < needle.length(); j++) { |
| 59 | + if (buf[i + j] != (byte)needle.charAt(j)) continue outer; |
| 60 | + } |
| 61 | + return i; |
| 62 | + } |
| 63 | + return 0; |
| 64 | + } |
| 65 | + |
| 66 | + private static void replaceString(byte[] buf, String name, int index) { |
| 67 | + for (int i = index; i < index + name.length(); i++) { |
| 68 | + buf[i] = (byte)name.charAt(i - index); |
| 69 | + } |
| 70 | + } |
| 71 | + |
| 72 | + private static void replaceAllStrings(byte[] buf, String oldString, String newString) throws Exception { |
| 73 | + assertTrue(oldString.length() == newString.length(), "must have same length"); |
| 74 | + int index = -1; |
| 75 | + while ((index = getStringIndex(oldString, buf, index + 1)) != 0) { |
| 76 | + replaceString(buf, newString, index); |
| 77 | + } |
| 78 | + } |
| 79 | + |
| 80 | + public static void main(String[] s) throws Exception { |
| 81 | + |
| 82 | + byte[] buf = getBytecodes("TestClassOld"); |
| 83 | + // Poor man's renaming of class "TestClassOld" to "TestClassXXX" |
| 84 | + replaceAllStrings(buf, "TestClassOld", "TestClassXXX"); |
| 85 | + ClassVersionAfterRedefine cvar = new ClassVersionAfterRedefine(); |
| 86 | + Class<?> old = cvar.defineClass(null, buf, 0, buf.length); |
| 87 | + Method foo = old.getMethod("foo"); |
| 88 | + Object result = foo.invoke(null); |
| 89 | + assertTrue("java-lang-String".equals(result)); |
| 90 | + System.out.println(old.getSimpleName() + ".foo() = " + result); |
| 91 | + |
| 92 | + buf = getBytecodes("TestClassNew"); |
| 93 | + // Rename class "TestClassNew" to "TestClassXXX" so we can use it for |
| 94 | + // redefining the original version of "TestClassXXX" (i.e. "TestClassOld"). |
| 95 | + replaceAllStrings(buf, "TestClassNew", "TestClassXXX"); |
| 96 | + // Now redine the original version of "TestClassXXX" (i.e. "TestClassOld"). |
| 97 | + RedefineClassHelper.redefineClass(old, buf); |
| 98 | + result = foo.invoke(null); |
| 99 | + assertTrue("java.lang.String".equals(result)); |
| 100 | + System.out.println(old.getSimpleName() + ".foo() = " + result); |
| 101 | + } |
| 102 | +} |
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