1 import com.sun.xml.internal.ws.org.objectweb.asm.*;
   2 
   3 class Asmator {
   4     static byte[] fixup(byte[] buf) throws java.io.IOException {
   5         ClassReader cr = new ClassReader(buf);
   6         ClassWriter cw = new ClassWriter(0) {
   7             public MethodVisitor visitMethod(
   8                 final int access,
   9                 final String name,
  10                 final String desc,
  11                 final String signature,
  12                 final String[] exceptions)
  13             {
  14                 MethodVisitor mv = super.visitMethod(access,
  15                         name,
  16                         desc,
  17                         signature,
  18                         exceptions);
  19                 if (mv == null)  return null;
  20                 if (name.equals("callme")) {
  21                     // make receiver go dead!
  22                     mv.visitInsn(Opcodes.ACONST_NULL);
  23                     mv.visitVarInsn(Opcodes.ASTORE, 0);
  24                 }
  25                 return mv;
  26             }
  27         };
  28         cr.accept(cw, 0);
  29         return cw.toByteArray();
  30     }
  31 }