diff --git a/clang/lib/CodeGen/CGRtti.cpp b/clang/lib/CodeGen/CGRtti.cpp
new file mode 100644
index 0000000..15f56dc
--- /dev/null
+++ b/clang/lib/CodeGen/CGRtti.cpp
@@ -0,0 +1,48 @@
+//===--- CGCXXRtti.cpp - Emit LLVM Code for C++ RTTI descriptors ----------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This contains code dealing with C++ code generation of RTTI descriptors.
+//
+//===----------------------------------------------------------------------===//
+
+#include "CodeGenModule.h"
+using namespace clang;
+using namespace CodeGen;
+
+llvm::Constant *CodeGenModule::GenerateRtti(const CXXRecordDecl *RD) {
+  llvm::Type *Ptr8Ty;
+  Ptr8Ty = llvm::PointerType::get(llvm::Type::getInt8Ty(VMContext), 0);
+  llvm::Constant *Rtti = llvm::Constant::getNullValue(Ptr8Ty);
+
+  if (!getContext().getLangOptions().Rtti)
+    return Rtti;
+
+  llvm::SmallString<256> OutName;
+  llvm::raw_svector_ostream Out(OutName);
+  QualType ClassTy;
+  ClassTy = getContext().getTagDeclType(RD);
+  mangleCXXRtti(getMangleContext(), ClassTy, Out);
+  llvm::GlobalVariable::LinkageTypes linktype;
+  linktype = llvm::GlobalValue::WeakAnyLinkage;
+  std::vector<llvm::Constant *> info;
+  // assert(0 && "FIXME: implement rtti descriptor");
+  // FIXME: descriptor
+  info.push_back(llvm::Constant::getNullValue(Ptr8Ty));
+  // assert(0 && "FIXME: implement rtti ts");
+  // FIXME: TS
+  info.push_back(llvm::Constant::getNullValue(Ptr8Ty));
+
+  llvm::Constant *C;
+  llvm::ArrayType *type = llvm::ArrayType::get(Ptr8Ty, info.size());
+  C = llvm::ConstantArray::get(type, info);
+  Rtti = new llvm::GlobalVariable(getModule(), type, true, linktype, C,
+                                  Out.str());
+  Rtti = llvm::ConstantExpr::getBitCast(Rtti, Ptr8Ty);
+  return Rtti;
+}