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diff --git a/clang/lib/CodeGen/CGOpenCLRuntime.h b/clang/lib/CodeGen/CGOpenCLRuntime.h
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+++ b/clang/lib/CodeGen/CGOpenCLRuntime.h
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+//===----- CGOpenCLRuntime.h - Interface to OpenCL Runtimes -----*- C++ -*-===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+//
+// This provides an abstract class for OpenCL code generation.  Concrete
+// subclasses of this implement code generation for specific OpenCL
+// runtime libraries.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_LIB_CODEGEN_CGOPENCLRUNTIME_H
+#define LLVM_CLANG_LIB_CODEGEN_CGOPENCLRUNTIME_H
+
+#include "clang/AST/Expr.h"
+#include "clang/AST/Type.h"
+#include "llvm/ADT/DenseMap.h"
+#include "llvm/IR/Type.h"
+#include "llvm/IR/Value.h"
+
+namespace clang {
+
+class BlockExpr;
+class Expr;
+class VarDecl;
+
+namespace CodeGen {
+
+class CodeGenFunction;
+class CodeGenModule;
+
+class CGOpenCLRuntime {
+protected:
+  CodeGenModule &CGM;
+  llvm::Type *PipeROTy;
+  llvm::Type *PipeWOTy;
+  llvm::PointerType *SamplerTy;
+
+  /// Structure for enqueued block information.
+  struct EnqueuedBlockInfo {
+    llvm::Function *InvokeFunc; /// Block invoke function.
+    llvm::Function *Kernel;     /// Enqueued block kernel.
+    llvm::Value *BlockArg;      /// The first argument to enqueued block kernel.
+  };
+  /// Maps block expression to block information.
+  llvm::DenseMap<const Expr *, EnqueuedBlockInfo> EnqueuedBlockMap;
+
+  virtual llvm::Type *getPipeType(const PipeType *T, StringRef Name,
+                                  llvm::Type *&PipeTy);
+
+public:
+  CGOpenCLRuntime(CodeGenModule &CGM) : CGM(CGM),
+    PipeROTy(nullptr), PipeWOTy(nullptr), SamplerTy(nullptr) {}
+  virtual ~CGOpenCLRuntime();
+
+  /// Emit the IR required for a work-group-local variable declaration, and add
+  /// an entry to CGF's LocalDeclMap for D.  The base class does this using
+  /// CodeGenFunction::EmitStaticVarDecl to emit an internal global for D.
+  virtual void EmitWorkGroupLocalVarDecl(CodeGenFunction &CGF,
+                                         const VarDecl &D);
+
+  virtual llvm::Type *convertOpenCLSpecificType(const Type *T);
+
+  virtual llvm::Type *getPipeType(const PipeType *T);
+
+  llvm::PointerType *getSamplerType(const Type *T);
+
+  // Returns a value which indicates the size in bytes of the pipe
+  // element.
+  virtual llvm::Value *getPipeElemSize(const Expr *PipeArg);
+
+  // Returns a value which indicates the alignment in bytes of the pipe
+  // element.
+  virtual llvm::Value *getPipeElemAlign(const Expr *PipeArg);
+
+  /// \return __generic void* type.
+  llvm::PointerType *getGenericVoidPointerType();
+
+  /// \return enqueued block information for enqueued block.
+  EnqueuedBlockInfo emitOpenCLEnqueuedBlock(CodeGenFunction &CGF,
+                                            const Expr *E);
+
+  /// Record invoke function and block literal emitted during normal
+  /// codegen for a block expression. The information is used by
+  /// emitOpenCLEnqueuedBlock to emit wrapper kernel.
+  ///
+  /// \param InvokeF invoke function emitted for the block expression.
+  /// \param Block block literal emitted for the block expression.
+  void recordBlockInfo(const BlockExpr *E, llvm::Function *InvokeF,
+                       llvm::Value *Block);
+
+  /// \return LLVM block invoke function emitted for an expression derived from
+  /// the block expression.
+  llvm::Function *getInvokeFunction(const Expr *E);
+};
+
+}
+}
+
+#endif