From f39e625888e8d29f3d76da0cf2545f42222732d6 Mon Sep 17 00:00:00 2001
From: Ryszard Rozak <rrozak@antmicro.com>
Date: Wed, 4 Dec 2024 08:44:59 +0100
Subject: [PATCH] Add body to randomize only if expression exists after being
 processed

Signed-off-by: Ryszard Rozak <rrozak@antmicro.com>
---
 src/V3Randomize.cpp | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/src/V3Randomize.cpp b/src/V3Randomize.cpp
index 073cda630a..a06761f1e3 100644
--- a/src/V3Randomize.cpp
+++ b/src/V3Randomize.cpp
@@ -884,10 +884,12 @@ class ConstraintExprVisitor final : public VNVisitor {
         m_taskp = new AstTask{nodep->fileline(), name + "_setup_constraint", m_genp};
         nodep->user2p(m_taskp);
         iterateChildren(nodep);
-        if (AstConstraint* constrp = VN_CAST(nodep, Constraint)) {
-            m_taskp->addStmtsp(constrp->itemsp()->unlinkFrBackWithNext());
-        } else if (AstWith* withp = VN_CAST(nodep, With)) {
-            m_taskp->addStmtsp(withp->exprp()->unlinkFrBackWithNext());
+        if (AstConstraint* const constrp = VN_CAST(nodep, Constraint)) {
+            if (constrp->itemsp()) {
+                m_taskp->addStmtsp(constrp->itemsp()->unlinkFrBackWithNext());
+            }
+        } else if (AstWith* const withp = VN_CAST(nodep, With)) {
+            if (withp->exprp()) m_taskp->addStmtsp(withp->exprp()->unlinkFrBackWithNext());
         }
     }
 };