def _op_def(self, op_name):
    return op_def_registry.get(op_name)

  def visit_block(self, block):
    return [self.visit(item) for item in block]

  def visit_Pass(self, node):
    if self.symbol_table.in_scf_scope():
      self._emit_with_loc('\nscf.yield', node)
    else:
      self._emit_with_loc('\ntfr.return', node)

  def visit_Attribute(self, node):

          visitWildcardType((WildcardType) type);
        } else if (type instanceof ParameterizedType) {
          visitParameterizedType((ParameterizedType) type);
        } else if (type instanceof Class) {
          visitClass((Class<?>) type);
        } else if (type instanceof GenericArrayType) {
          visitGenericArrayType((GenericArrayType) type);
        } else {
          throw new AssertionError("Unknown type: " + type);
        }

  }

  public void testVisitClass() {
    assertVisited(String.class);
    new BaseTypeVisitor() {
      @Override
      void visitClass(Class<?> t) {}
    }.visit(String.class);
  }

  public <T> void testVisitTypeVariable() {
    Type type = new TypeCapture<T>() {}.capture();
    assertVisited(type);
    new BaseTypeVisitor() {
      @Override

        return new SerializeMap() {
            final Map<Short, ClassLoaderDetails> knownLoaders = new HashMap<>();

            @Override
            public short visitClass(Class<?> target) {
                ClassLoader classLoader = target.getClassLoader();
                if (classLoader == null || PLATFORM_CLASS_LOADERS.contains(classLoader)) {

    }

    private static void visitConstructorParameters(Type[] parameterTypes, boolean addNameParameter, StringBuilder builder) {
        builder.append('(');
        if (addNameParameter) {
            visitClass(String.class, builder);
        }
        visitTypes(parameterTypes, builder);
        builder.append(')');
    }

    public static String getterSignature(java.lang.reflect.Type returnType) {

  }

  public void testVisitClass() {
    assertVisited(String.class);
    new BaseTypeVisitor() {
      @Override
      void visitClass(Class<?> t) {}
    }.visit(String.class);
  }

  public <T> void testVisitTypeVariable() {
    Type type = new TypeCapture<T>() {}.capture();
    assertVisited(type);
    new BaseTypeVisitor() {
      @Override

          visitWildcardType((WildcardType) type);
        } else if (type instanceof ParameterizedType) {
          visitParameterizedType((ParameterizedType) type);
        } else if (type instanceof Class) {
          visitClass((Class<?>) type);
        } else if (type instanceof GenericArrayType) {
          visitGenericArrayType((GenericArrayType) type);
        } else {
          throw new AssertionError("Unknown type: " + type);
        }

        return context;
    }

    @Override
    public ConstantsVisitorContext visitClass(ClassTree node, ConstantsVisitorContext context) {
        Element element = trees.getElement(getCurrentPath());

        String visitedClass = getBinaryClassName((TypeElement) element);
        super.visitClass(node, new ConstantsVisitorContext(visitedClass, consumer::consumePrivateDependent));

        return context;
    }

     * The id is unique only for this serialization, and is used as the key for the map built by {@link #collectClassLoaderDefinitions(Map)}.
     *
     * @return The ClassLoader id.
     */
    short visitClass(Class<?> target);

    /**
     * Collects the set of ClassLoader definitions to use to deserialize the graph.
     *
     * @param details The map from ClassLoader id to details to use create that ClassLoader.
     */

        if (TopLevelExceptionPlaceholder.class.getPackage().equals(targetClass.getPackage())) {
            writeShort(SAME_CLASSLOADER_TOKEN);
        } else {
            writeShort(map.visitClass(targetClass));
        }
    }