private void checkPrototype(Prototype proto) {
    checkDescriptor(proto.getReturnType().getDescriptor());
    StdTypeList args = proto.getParameterTypes();
    for (int i = 0; i < args.size(); i++) {
      checkDescriptor(args.get(i).getDescriptor());
    }
  }
@param jarOfRoots Archive containing the class files resulting of the tracing, typically this
    is the result of running ProGuard.
android/android_framework/dex-maker/src/main/java/com/android/multidex/ClassReferenceListBuilder.java