1 files changed, 18 insertions, 2 deletions
diff --git a/llvm/lib/Support/YAMLTraits.cpp b/llvm/lib/Support/YAMLTraits.cpp
index 99d2070cb6e..51c016b1d55 100644
--- a/llvm/lib/Support/YAMLTraits.cpp
+++ b/llvm/lib/Support/YAMLTraits.cpp
@@ -118,6 +118,18 @@ void Input::beginMapping() {
   }
 }
 
+std::vector<StringRef> Input::keys() {
+  MapHNode *MN = dyn_cast<MapHNode>(CurrentNode);
+  std::vector<StringRef> Ret;
+  if (!MN) {
+    setError(CurrentNode, "not a mapping");
+    return Ret;
+  }
+  for (auto &P : MN->Mapping)
+    Ret.push_back(P.first());
+  return Ret;
+}
+
 bool Input::preflightKey(const char *Key, bool Required, bool, bool &UseDefault,
                          void *&SaveInfo) {
   UseDefault = false;
@@ -374,8 +386,8 @@ std::unique_ptr<Input::HNode> Input::createHNodes(Node *N) {
 }
 
 bool Input::MapHNode::isValidKey(StringRef Key) {
-  for (const char *K : ValidKeys) {
-    if (Key.equals(K))
+  for (std::string &K : ValidKeys) {
+    if (Key == K)
       return true;
   }
   return false;
@@ -451,6 +463,10 @@ void Output::endMapping() {
   StateStack.pop_back();
 }
 
+std::vector<StringRef> Output::keys() {
+  report_fatal_error("invalid call");
+}
+
 bool Output::preflightKey(const char *Key, bool Required, bool SameAsDefault,
                           bool &UseDefault, void *&) {
   UseDefault = false;