103 lines
4.1 KiB
Java
103 lines
4.1 KiB
Java
/*
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* Copyright Amazon.com Inc. 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 8267555
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* @requires vm.jvmti
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* @summary Class redefinition with a different class file version
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* @library /test/lib
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* @compile TestClassOld.jasm TestClassNew.jasm
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* @run main RedefineClassHelper
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* @run main/othervm -javaagent:redefineagent.jar ClassVersionAfterRedefine
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*/
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import java.io.InputStream;
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import java.lang.reflect.Method;
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import static jdk.test.lib.Asserts.assertTrue;
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public class ClassVersionAfterRedefine extends ClassLoader {
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private static String myName = ClassVersionAfterRedefine.class.getName();
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private static byte[] getBytecodes(String name) throws Exception {
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InputStream is = ClassVersionAfterRedefine.class.getResourceAsStream(name + ".class");
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byte[] buf = is.readAllBytes();
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System.out.println("sizeof(" + name + ".class) == " + buf.length);
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return buf;
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}
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private static int getStringIndex(String needle, byte[] buf) {
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return getStringIndex(needle, buf, 0);
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}
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private static int getStringIndex(String needle, byte[] buf, int offset) {
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outer:
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for (int i = offset; i < buf.length - offset - needle.length(); i++) {
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for (int j = 0; j < needle.length(); j++) {
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if (buf[i + j] != (byte)needle.charAt(j)) continue outer;
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}
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return i;
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}
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return 0;
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}
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private static void replaceString(byte[] buf, String name, int index) {
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for (int i = index; i < index + name.length(); i++) {
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buf[i] = (byte)name.charAt(i - index);
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}
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}
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private static void replaceAllStrings(byte[] buf, String oldString, String newString) throws Exception {
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assertTrue(oldString.length() == newString.length(), "must have same length");
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int index = -1;
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while ((index = getStringIndex(oldString, buf, index + 1)) != 0) {
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replaceString(buf, newString, index);
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}
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}
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public static void main(String[] s) throws Exception {
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byte[] buf = getBytecodes("TestClassOld");
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// Poor man's renaming of class "TestClassOld" to "TestClassXXX"
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replaceAllStrings(buf, "TestClassOld", "TestClassXXX");
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ClassVersionAfterRedefine cvar = new ClassVersionAfterRedefine();
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Class<?> old = cvar.defineClass(null, buf, 0, buf.length);
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Method foo = old.getMethod("foo");
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Object result = foo.invoke(null);
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assertTrue("java-lang-String".equals(result));
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System.out.println(old.getSimpleName() + ".foo() = " + result);
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buf = getBytecodes("TestClassNew");
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// Rename class "TestClassNew" to "TestClassXXX" so we can use it for
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// redefining the original version of "TestClassXXX" (i.e. "TestClassOld").
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replaceAllStrings(buf, "TestClassNew", "TestClassXXX");
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// Now redine the original version of "TestClassXXX" (i.e. "TestClassOld").
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RedefineClassHelper.redefineClass(old, buf);
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result = foo.invoke(null);
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assertTrue("java.lang.String".equals(result));
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System.out.println(old.getSimpleName() + ".foo() = " + result);
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}
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}
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