1/* 2 * Copyright (c) 2012, 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 24import jdk.internal.org.objectweb.asm.*; 25 26class Asmator { 27 static byte[] fixup(byte[] buf) throws java.io.IOException { 28 ClassReader cr = new ClassReader(buf); 29 ClassWriter cw = new ClassWriter(0); 30 ClassVisitor cv = new ClassVisitor(Opcodes.ASM4, cw) { 31 public MethodVisitor visitMethod( 32 final int access, 33 final String name, 34 final String desc, 35 final String signature, 36 final String[] exceptions) 37 { 38 MethodVisitor mv = super.visitMethod(access, 39 name, 40 desc, 41 signature, 42 exceptions); 43 if (mv == null) return null; 44 if (name.equals("callme")) { 45 // make receiver go dead! 46 mv.visitInsn(Opcodes.ACONST_NULL); 47 mv.visitVarInsn(Opcodes.ASTORE, 0); 48 } 49 return mv; 50 } 51 }; 52 cr.accept(cv, 0); 53 return cw.toByteArray(); 54 } 55} 56