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diff --git a/lib/CodeGen/CoverageMappingGen.h b/lib/CodeGen/CoverageMappingGen.h
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+//===---- CoverageMappingGen.h - Coverage mapping generation ----*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// Instrumentation-based code coverage mapping generator
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_LIB_CODEGEN_COVERAGEMAPPINGGEN_H
+#define LLVM_CLANG_LIB_CODEGEN_COVERAGEMAPPINGGEN_H
+
+#include "clang/Basic/LLVM.h"
+#include "clang/Basic/SourceLocation.h"
+#include "clang/Frontend/CodeGenOptions.h"
+#include "clang/Lex/PPCallbacks.h"
+#include "llvm/ADT/DenseMap.h"
+#include "llvm/ADT/StringMap.h"
+#include "llvm/IR/GlobalValue.h"
+#include "llvm/Support/raw_ostream.h"
+
+namespace clang {
+
+class LangOptions;
+class SourceManager;
+class FileEntry;
+class Preprocessor;
+class Decl;
+class Stmt;
+
+/// \brief Stores additional source code information like skipped ranges which
+/// is required by the coverage mapping generator and is obtained from
+/// the preprocessor.
+class CoverageSourceInfo : public PPCallbacks {
+  std::vector<SourceRange> SkippedRanges;
+public:
+  ArrayRef<SourceRange> getSkippedRanges() const { return SkippedRanges; }
+
+  void SourceRangeSkipped(SourceRange Range) override;
+};
+
+namespace CodeGen {
+
+class CodeGenModule;
+
+/// \brief Organizes the cross-function state that is used while generating
+/// code coverage mapping data.
+class CoverageMappingModuleGen {
+  CodeGenModule &CGM;
+  CoverageSourceInfo &SourceInfo;
+  llvm::SmallDenseMap<const FileEntry *, unsigned, 8> FileEntries;
+  std::vector<llvm::Constant *> FunctionRecords;
+  llvm::StructType *FunctionRecordTy;
+  std::string CoverageMappings;
+
+public:
+  CoverageMappingModuleGen(CodeGenModule &CGM, CoverageSourceInfo &SourceInfo)
+      : CGM(CGM), SourceInfo(SourceInfo), FunctionRecordTy(nullptr) {}
+
+  CoverageSourceInfo &getSourceInfo() const {
+    return SourceInfo;
+  }
+
+  /// \brief Add a function's coverage mapping record to the collection of the
+  /// function mapping records.
+  void addFunctionMappingRecord(llvm::GlobalVariable *FunctionName,
+                                StringRef FunctionNameValue,
+                                uint64_t FunctionHash,
+                                const std::string &CoverageMapping);
+
+  /// \brief Emit the coverage mapping data for a translation unit.
+  void emit();
+
+  /// \brief Return the coverage mapping translation unit file id
+  /// for the given file.
+  unsigned getFileID(const FileEntry *File);
+};
+
+/// \brief Organizes the per-function state that is used while generating
+/// code coverage mapping data.
+class CoverageMappingGen {
+  CoverageMappingModuleGen &CVM;
+  SourceManager &SM;
+  const LangOptions &LangOpts;
+  llvm::DenseMap<const Stmt *, unsigned> *CounterMap;
+
+public:
+  CoverageMappingGen(CoverageMappingModuleGen &CVM, SourceManager &SM,
+                     const LangOptions &LangOpts)
+      : CVM(CVM), SM(SM), LangOpts(LangOpts), CounterMap(nullptr) {}
+
+  CoverageMappingGen(CoverageMappingModuleGen &CVM, SourceManager &SM,
+                     const LangOptions &LangOpts,
+                     llvm::DenseMap<const Stmt *, unsigned> *CounterMap)
+      : CVM(CVM), SM(SM), LangOpts(LangOpts), CounterMap(CounterMap) {}
+
+  /// \brief Emit the coverage mapping data which maps the regions of
+  /// code to counters that will be used to find the execution
+  /// counts for those regions.
+  void emitCounterMapping(const Decl *D, llvm::raw_ostream &OS);
+
+  /// \brief Emit the coverage mapping data for an unused function.
+  /// It creates mapping regions with the counter of zero.
+  void emitEmptyMapping(const Decl *D, llvm::raw_ostream &OS);
+};
+
+} // end namespace CodeGen
+} // end namespace clang
+
+#endif