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+//=====-- ModularizeUtilities.h - Utilities for modularize -*- C++ -*-======//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===--------------------------------------------------------------------===//
+///
+/// \file
+/// \brief ModularizeUtilities class definition.
+///
+//===--------------------------------------------------------------------===//
+
+#ifndef MODULARIZEUTILITIES_H
+#define MODULARIZEUTILITIES_H
+
+#include "Modularize.h"
+#include <string>
+#include <vector>
+
+namespace Modularize {
+
+/// Modularize utilities class.
+/// Support functions and data for modularize.
+class ModularizeUtilities {
+public:
+  // Input arguments.
+
+  /// The input file paths.
+  std::vector<std::string> InputFilePaths;
+  /// The header prefix.
+  llvm::StringRef HeaderPrefix;
+
+  // Output data.
+
+  // List of top-level header files.
+  llvm::SmallVector<std::string, 32> HeaderFileNames;
+  // Map of top-level header file dependencies.
+  DependencyMap Dependencies;
+
+  // Functions.
+
+  /// Constructor.
+  /// You can use the static createModularizeUtilities to create an instance
+  /// of this object.
+  /// \param InputPaths The input file paths.
+  /// \param Prefix The headear path prefix.
+  ModularizeUtilities(std::vector<std::string> &InputPaths,
+                      llvm::StringRef Prefix);
+
+  /// Create instance of ModularizeUtilities.
+  /// \param InputPaths The input file paths.
+  /// \param Prefix The headear path prefix.
+  /// \returns Initialized ModularizeUtilities object.
+  static ModularizeUtilities *createModularizeUtilities(
+      std::vector<std::string> &InputPaths,
+                  llvm::StringRef Prefix);
+
+  /// Load header list and dependencies.
+  /// \returns std::error_code.
+  std::error_code loadAllHeaderListsAndDependencies();
+
+protected:
+  /// Load single header list and dependencies.
+  /// \param InputPath The input file path.
+  /// \returns std::error_code.
+  std::error_code loadSingleHeaderListsAndDependencies(
+      llvm::StringRef InputPath);
+};
+
+} // end namespace Modularize
+
+#endif // MODULARIZEUTILITIES_H