1 files changed, 15 insertions, 1 deletions
diff --git a/llvm/lib/Bitcode/Reader/MetadataLoader.h b/llvm/lib/Bitcode/Reader/MetadataLoader.h
index 653f1402bead..fbee7e49f8df 100644
--- a/llvm/lib/Bitcode/Reader/MetadataLoader.h
+++ b/llvm/lib/Bitcode/Reader/MetadataLoader.h
@@ -29,6 +29,20 @@ class Module;
 class Type;
 template <typename T> class ArrayRef;
 
+typedef std::function<Type *(unsigned)> GetTypeByIDTy;
+
+typedef std::function<unsigned(unsigned, unsigned)> GetContainedTypeIDTy;
+
+typedef std::function<void(Metadata **, unsigned, GetTypeByIDTy,
+                           GetContainedTypeIDTy)>
+    MDTypeCallbackTy;
+
+struct MetadataLoaderCallbacks {
+  GetTypeByIDTy GetTypeByID;
+  GetContainedTypeIDTy GetContainedTypeID;
+  std::optional<MDTypeCallbackTy> MDType;
+};
+
 /// Helper class that handles loading Metadatas and keeping them available.
 class MetadataLoader {
   class MetadataLoaderImpl;
@@ -39,7 +53,7 @@ public:
   ~MetadataLoader();
   MetadataLoader(BitstreamCursor &Stream, Module &TheModule,
                  BitcodeReaderValueList &ValueList, bool IsImporting,
-                 std::function<Type *(unsigned)> getTypeByID);
+                 MetadataLoaderCallbacks Callbacks);
   MetadataLoader &operator=(MetadataLoader &&);
   MetadataLoader(MetadataLoader &&);