From a82f8838c60b7a3b240e185983dacb3291396f3e Mon Sep 17 00:00:00 2001
From: Devang Patel <dpatel@apple.com>
Date: Mon, 3 Aug 2009 06:19:01 +0000
Subject: [PATCH] Add NamedMDNode destructor.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77959 91177308-0d34-0410-b5e6-96231b3b80d8
---
 include/llvm/Metadata.h |  9 +++++++++
 lib/VMCore/Metadata.cpp | 17 +++++++++++++++++
 2 files changed, 26 insertions(+)

diff --git a/include/llvm/Metadata.h b/include/llvm/Metadata.h
index 95100c27496..7b48d8afbfa 100644
--- a/include/llvm/Metadata.h
+++ b/include/llvm/Metadata.h
@@ -200,6 +200,15 @@ public:
     return new NamedMDNode(N, MDs, NumMDs, M);
   }
 
+  /// eraseFromParent - Drop all references and remove the node from parent
+  /// module.
+  void eraseFromParent();
+
+  /// dropAllReferences - Remove all uses and clear node vector.
+  void dropAllReferences();
+
+  ~NamedMDNode();
+
   typedef SmallVectorImpl<WeakMetadataVH>::const_iterator const_elem_iterator;
 
   /// getParent - Get the module that holds this named metadata collection.
diff --git a/lib/VMCore/Metadata.cpp b/lib/VMCore/Metadata.cpp
index bf0611f9e46..f548e549441 100644
--- a/lib/VMCore/Metadata.cpp
+++ b/lib/VMCore/Metadata.cpp
@@ -83,3 +83,20 @@ NamedMDNode::NamedMDNode(const Twine &N, MetadataBase*const* MDs,
   if (ParentModule)
     ParentModule->getNamedMDList().push_back(this);
 }
+
+/// eraseFromParent - Drop all references and remove the node from parent
+/// module.
+void NamedMDNode::eraseFromParent() {
+  dropAllReferences();
+  getParent()->getNamedMDList().erase(this);
+}
+
+/// dropAllReferences - Remove all uses and clear node vector.
+void NamedMDNode::dropAllReferences() {
+  // FIXME: Update metadata use list.
+  Node.clear();
+}
+
+NamedMDNode::~NamedMDNode() {
+  dropAllReferences();
+}