Add NamedMDNode destructor.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77959 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 26 insertions, 0 deletions

diff --git a/include/llvm/Metadata.h b/include/llvm/Metadata.h
index 95100c2749..7b48d8afbf 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 bf0611f9e4..f548e54944 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();
+}