1 /* 2 * Copyright (c) 2019, 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 // This is copied from DefineAnon to test Symbol Refcounting for the package prepended name. 25 26 package p1; 27 28 import jdk.internal.org.objectweb.asm.ClassWriter; 29 import jdk.internal.org.objectweb.asm.MethodVisitor; 30 import jdk.internal.org.objectweb.asm.Opcodes; 31 import jdk.internal.misc.Unsafe; 32 33 34 class T { test0()35 static protected void test0() { System.out.println("test0 (public)"); } test1()36 static protected void test1() { System.out.println("test1 (protected)"); } test2()37 static /*package-private*/ void test2() { System.out.println("test2 (package)"); } test3()38 static private void test3() { System.out.println("test3 (private)"); } 39 } 40 41 public class AnonSymbolLeak { 42 43 private static final Unsafe UNSAFE = Unsafe.getUnsafe(); 44 getAnonClass(Class<?> hostClass, final String className)45 static Class<?> getAnonClass(Class<?> hostClass, final String className) { 46 final String superName = "java/lang/Object"; 47 ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS + ClassWriter.COMPUTE_FRAMES); 48 cw.visit(Opcodes.V1_8, Opcodes.ACC_PUBLIC + Opcodes.ACC_FINAL + Opcodes.ACC_SUPER, className, null, superName, null); 49 50 MethodVisitor mv = cw.visitMethod(Opcodes.ACC_STATIC | Opcodes.ACC_PUBLIC, "test", "()V", null, null); 51 mv.visitMethodInsn(Opcodes.INVOKESTATIC, "p1/T", "test0", "()V", false); 52 mv.visitMethodInsn(Opcodes.INVOKESTATIC, "p1/T", "test1", "()V", false); 53 mv.visitMethodInsn(Opcodes.INVOKESTATIC, "p1/T", "test2", "()V", false); 54 mv.visitMethodInsn(Opcodes.INVOKESTATIC, "p1/T", "test3", "()V", false); 55 mv.visitInsn(Opcodes.RETURN); 56 mv.visitMaxs(0, 0); 57 mv.visitEnd(); 58 59 final byte[] classBytes = cw.toByteArray(); 60 Class<?> invokerClass = UNSAFE.defineAnonymousClass(hostClass, classBytes, new Object[0]); 61 UNSAFE.ensureClassInitialized(invokerClass); 62 return invokerClass; 63 } 64 test()65 public static void test() throws Throwable { 66 // AnonClass is injected into package p1. 67 System.out.println("Injecting from the same package (p1):"); 68 Class<?> p1cls = getAnonClass(T.class, "AnonClass"); 69 p1cls.getMethod("test").invoke(null); 70 } 71 main(java.lang.String[] unused)72 public static void main(java.lang.String[] unused) throws Throwable { 73 test(); 74 } 75 } 76