InputStream is,
byte[] classRep, int offset, int length,
  public static final VM_Type defineClassInternal(String className,                                                   InputStream is,                                                   ClassLoader classloader) throws ClassFormatError {    VM_TypeReference tRef;    if (className == null) {      // NUTS: Our caller hasn't bothered to tell us what this class is supposed      //       to be called, so we must read the input stream and discover it overselves      //       before we actually can create the VM_Class instance.      try {        is.mark(is.available());        tRef = getClassTypeRef(new DataInputStream(is), classloader);        is.reset();      } catch (IOException e) {        ClassFormatError cfe = new ClassFormatError(e.getMessage());        cfe.initCause(e);        throw cfe;      }    } else {      VM_Atom classDescriptor = VM_Atom.findOrCreateAsciiAtom(className.replace('.','/')).descriptorFromClassName();      tRef = VM_TypeReference.findOrCreate(classloader, classDescriptor);    }    try {      if (VM.VerifyAssertions) VM._assert(tRef.isClassType());      if (VM.TraceClassLoading  && VM.runningVM)        VM.sysWriteln("loading \"" + tRef.getName() + "\" with " + classloader);      VM_Class ans = VM_Class.readClass(tRef, new DataInputStream(is));      tRef.setResolvedType(ans);      return ans;    } catch (IOException e) {      ClassFormatError cfe = new ClassFormatError(e.getMessage());      cfe.initCause(e);      throw cfe;    }  }