From 58b50b7737745e3ce2746496f92790c035c8bed8 Mon Sep 17 00:00:00 2001
From: Ryszard Rozak <rrozak@antmicro.com>
Date: Fri, 27 Oct 2023 12:00:52 +0200
Subject: [PATCH] Handle nullptr in dynamic cast

Signed-off-by: Ryszard Rozak <rrozak@antmicro.com>
---
 include/verilated_types.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/include/verilated_types.h b/include/verilated_types.h
index 0a92725a9e..54d652f70c 100644
--- a/include/verilated_types.h
+++ b/include/verilated_types.h
@@ -1685,6 +1685,10 @@ class VlClassRef final {
 
 template <typename T, typename U>
 static inline bool VL_CAST_DYNAMIC(VlClassRef<T> in, VlClassRef<U>& outr) {
+    if (!in) {
+        outr = VlNull{};
+        return true;
+    }
     VlClassRef<U> casted = in.template dynamicCast<U>();
     if (VL_LIKELY(casted)) {
         outr = casted;