public Code readCode(ClassData.Method method) {
    int offset = method.getCodeOffset();
    if (offset == 0) {
      throw new IllegalArgumentException("offset == 0");
    }
    return open(offset).readCode();
  }
Returns a copy of the the bytes of this dex.
android/android_framework/dex-maker/src/main/java/com/android/dex/Dex.java