[llvm] [IR] Fix Module move-assignment missing NamedMDSymTab, ComdatSymTab and Parent update (PR #175501)

[Zichen Lu via llvm-commits]

https://github.com/MikaOvO updated https://github.com/llvm/llvm-project/pull/175501

>From 0925e1d2b51f8f9497d0bf4f7ae838c8a925959f Mon Sep 17 00:00:00 2001
From: Zichen Lu <mikaovo2000 at gmail.com>
Date: Mon, 12 Jan 2026 16:27:26 +0800
Subject: [PATCH] [IR] Fix Module move-assignment missing NamedMDSymTab,
 ComdatSymTab and Parent update

---
 llvm/lib/IR/Module.cpp           | 5 +++++
 llvm/unittests/IR/ModuleTest.cpp | 7 +++++++
 2 files changed, 12 insertions(+)

diff --git a/llvm/lib/IR/Module.cpp b/llvm/lib/IR/Module.cpp
index e19336efd1c8a..858ffae23b8f6 100644
--- a/llvm/lib/IR/Module.cpp
+++ b/llvm/lib/IR/Module.cpp
@@ -98,6 +98,11 @@ Module &Module::operator=(Module &&Other) {
 
   NamedMDList.clear();
   NamedMDList.splice(NamedMDList.begin(), Other.NamedMDList);
+  for (NamedMDNode &NMD : NamedMDList)
+    namedMDNode.setParent(this);
+
+  NamedMDSymTab = std::move(Other.NamedMDSymTab);
+  ComdatSymTab = std::move(Other.ComdatSymTab); 
   GlobalScopeAsm = std::move(Other.GlobalScopeAsm);
   OwnedMemoryBuffer = std::move(Other.OwnedMemoryBuffer);
   Materializer = std::move(Other.Materializer);
diff --git a/llvm/unittests/IR/ModuleTest.cpp b/llvm/unittests/IR/ModuleTest.cpp
index 1e4565b219386..255216dc17b2f 100644
--- a/llvm/unittests/IR/ModuleTest.cpp
+++ b/llvm/unittests/IR/ModuleTest.cpp
@@ -423,6 +423,13 @@ define void @Foo2() {
     ASSERT_EQ(GV2->getParent(), &*M2);
     *M1 = std::move(*M2);
     ASSERT_EQ(GV2->getParent(), &*M1);
+    
+    ASSERT_NE(M1->getNamedMetadata("foo2"), nullptr);
+    ASSERT_NE(M1->getNamedMetadata("bar2"), nullptr);
+    ASSERT_EQ(M1->getNamedMetadata("foo1"), nullptr);
+    
+    for (const NamedMDNode &NMD : M1->named_metadata())
+      ASSERT_EQ(NMD.getParent(), &*M1);
   }
 
   std::string M1Print;