Add a way to replace a field inside a metadata node. This can be

used to incrementally update a created node without needing a
temporary node and RAUW.

llvm-svn: 150571

1 files changed, 5 insertions, 0 deletions

diff --git a/llvm/lib/VMCore/Metadata.cpp b/llvm/lib/VMCore/Metadata.cpp
index 5d6eb144c3e..0fc2a2534d2 100644
--- a/llvm/lib/VMCore/Metadata.cpp
+++ b/llvm/lib/VMCore/Metadata.cpp
@@ -87,6 +87,11 @@ static MDNodeOperand *getOperandPtr(MDNode *N, unsigned Op) {
   return reinterpret_cast<MDNodeOperand*>(N+1)+Op;
 }
 
+void MDNode::replaceOperandWith(unsigned i, Value *Val) {
+  MDNodeOperand *Op = getOperandPtr(this, i);
+  replaceOperand(Op, Val);
+}
+
 MDNode::MDNode(LLVMContext &C, ArrayRef<Value*> Vals, bool isFunctionLocal)
 : Value(Type::getMetadataTy(C), Value::MDNodeVal) {
   NumOperands = Vals.size();