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diff --git a/include/clang/Tooling/DependencyScanning/DependencyScanningService.h b/include/clang/Tooling/DependencyScanning/DependencyScanningService.h
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+++ b/include/clang/Tooling/DependencyScanning/DependencyScanningService.h
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+//===- DependencyScanningService.h - clang-scan-deps service ===-*- 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
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_TOOLING_DEPENDENCY_SCANNING_SERVICE_H
+#define LLVM_CLANG_TOOLING_DEPENDENCY_SCANNING_SERVICE_H
+
+#include "clang/Tooling/DependencyScanning/DependencyScanningFilesystem.h"
+
+namespace clang {
+namespace tooling {
+namespace dependencies {
+
+/// The mode in which the dependency scanner will operate to find the
+/// dependencies.
+enum class ScanningMode {
+  /// This mode is used to compute the dependencies by running the preprocessor
+  /// over
+  /// the unmodified source files.
+  CanonicalPreprocessing,
+
+  /// This mode is used to compute the dependencies by running the preprocessor
+  /// over
+  /// the source files that have been minimized to contents that might affect
+  /// the dependencies.
+  MinimizedSourcePreprocessing
+};
+
+/// The dependency scanning service contains the shared state that is used by
+/// the invidual dependency scanning workers.
+class DependencyScanningService {
+public:
+  DependencyScanningService(ScanningMode Mode, bool ReuseFileManager = true,
+                            bool SkipExcludedPPRanges = true);
+
+  ScanningMode getMode() const { return Mode; }
+
+  bool canReuseFileManager() const { return ReuseFileManager; }
+
+  bool canSkipExcludedPPRanges() const { return SkipExcludedPPRanges; }
+
+  DependencyScanningFilesystemSharedCache &getSharedCache() {
+    return SharedCache;
+  }
+
+private:
+  const ScanningMode Mode;
+  const bool ReuseFileManager;
+  /// Set to true to use the preprocessor optimization that skips excluded PP
+  /// ranges by bumping the buffer pointer in the lexer instead of lexing the
+  /// tokens in the range until reaching the corresponding directive.
+  const bool SkipExcludedPPRanges;
+  /// The global file system cache.
+  DependencyScanningFilesystemSharedCache SharedCache;
+};
+
+} // end namespace dependencies
+} // end namespace tooling
+} // end namespace clang
+
+#endif // LLVM_CLANG_TOOLING_DEPENDENCY_SCANNING_SERVICE_H