================
@@ -0,0 +1,39 @@
+//===- HLSLTargetInfo.h 
---------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM 
Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "ABIInfoImpl.h"
+#include "TargetInfo.h"
+
+using namespace clang;
+using namespace clang::CodeGen;
+
+//===----------------------------------------------------------------------===//
+// Target codegen info implementation common between DirectX and SPIR/SPIR-V.
+//===----------------------------------------------------------------------===//
+
+class CommonHLSLTargetCodeGenInfo : public TargetCodeGenInfo {
+public:
+  CommonHLSLTargetCodeGenInfo(std::unique_ptr<ABIInfo> Info)
+      : TargetCodeGenInfo(std::move(Info)) {}
+
+  // Returns LLVM target extension type "dx.Layout" or "spv.Layout"
+  // for given structure type and layout data. The first number in
+  // the Layout is the size followed by offsets for each struct element.
+  virtual llvm::Type *getHLSLLayoutType(CodeGenModule &CGM,
+                                        llvm::StructType *LayoutStructTy,
+                                        SmallVector<unsigned> Layout) const {
+    return nullptr;
----------------
bogner wrote:

Should this be a pure virtual function? Deriving from 
CommonHLSLTargetCodeGenInfo but not defining this function seems like it would 
be a hard error.

https://github.com/llvm/llvm-project/pull/124886
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