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diff --git a/clang-r353983/include/clang/Lex/HeaderSearchOptions.h b/clang-r353983/include/clang/Lex/HeaderSearchOptions.h
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+//===- HeaderSearchOptions.h ------------------------------------*- 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_LEX_HEADERSEARCHOPTIONS_H
+#define LLVM_CLANG_LEX_HEADERSEARCHOPTIONS_H
+
+#include "clang/Basic/LLVM.h"
+#include "llvm/ADT/CachedHashString.h"
+#include "llvm/ADT/SetVector.h"
+#include "llvm/ADT/StringRef.h"
+#include <cstdint>
+#include <string>
+#include <vector>
+#include <map>
+
+namespace clang {
+
+namespace frontend {
+
+/// IncludeDirGroup - Identifies the group an include Entry belongs to,
+/// representing its relative positive in the search list.
+/// \#include directives whose paths are enclosed by string quotes ("")
+/// start searching at the Quoted group (specified by '-iquote'),
+/// then search the Angled group, then the System group, etc.
+enum IncludeDirGroup {
+  /// '\#include ""' paths, added by 'gcc -iquote'.
+  Quoted = 0,
+
+  /// Paths for '\#include <>' added by '-I'.
+  Angled,
+
+  /// Like Angled, but marks header maps used when building frameworks.
+  IndexHeaderMap,
+
+  /// Like Angled, but marks system directories.
+  System,
+
+  /// Like System, but headers are implicitly wrapped in extern "C".
+  ExternCSystem,
+
+  /// Like System, but only used for C.
+  CSystem,
+
+  /// Like System, but only used for C++.
+  CXXSystem,
+
+  /// Like System, but only used for ObjC.
+  ObjCSystem,
+
+  /// Like System, but only used for ObjC++.
+  ObjCXXSystem,
+
+  /// Like System, but searched after the system directories.
+  After
+};
+
+} // namespace frontend
+
+/// HeaderSearchOptions - Helper class for storing options related to the
+/// initialization of the HeaderSearch object.
+class HeaderSearchOptions {
+public:
+  struct Entry {
+    std::string Path;
+    frontend::IncludeDirGroup Group;
+    unsigned IsFramework : 1;
+
+    /// IgnoreSysRoot - This is false if an absolute path should be treated
+    /// relative to the sysroot, or true if it should always be the absolute
+    /// path.
+    unsigned IgnoreSysRoot : 1;
+
+    Entry(StringRef path, frontend::IncludeDirGroup group, bool isFramework,
+          bool ignoreSysRoot)
+        : Path(path), Group(group), IsFramework(isFramework),
+          IgnoreSysRoot(ignoreSysRoot) {}
+  };
+
+  struct SystemHeaderPrefix {
+    /// A prefix to be matched against paths in \#include directives.
+    std::string Prefix;
+
+    /// True if paths beginning with this prefix should be treated as system
+    /// headers.
+    bool IsSystemHeader;
+
+    SystemHeaderPrefix(StringRef Prefix, bool IsSystemHeader)
+        : Prefix(Prefix), IsSystemHeader(IsSystemHeader) {}
+  };
+
+  /// If non-empty, the directory to use as a "virtual system root" for include
+  /// paths.
+  std::string Sysroot;
+
+  /// User specified include entries.
+  std::vector<Entry> UserEntries;
+
+  /// User-specified system header prefixes.
+  std::vector<SystemHeaderPrefix> SystemHeaderPrefixes;
+
+  /// The directory which holds the compiler resource files (builtin includes,
+  /// etc.).
+  std::string ResourceDir;
+
+  /// The directory used for the module cache.
+  std::string ModuleCachePath;
+
+  /// The directory used for a user build.
+  std::string ModuleUserBuildPath;
+
+  /// The mapping of module names to prebuilt module files.
+  std::map<std::string, std::string> PrebuiltModuleFiles;
+
+  /// The directories used to load prebuilt module files.
+  std::vector<std::string> PrebuiltModulePaths;
+
+  /// The module/pch container format.
+  std::string ModuleFormat;
+
+  /// Whether we should disable the use of the hash string within the
+  /// module cache.
+  ///
+  /// Note: Only used for testing!
+  unsigned DisableModuleHash : 1;
+
+  /// Implicit module maps.  This option is enabld by default when
+  /// modules is enabled.
+  unsigned ImplicitModuleMaps : 1;
+
+  /// Set the 'home directory' of a module map file to the current
+  /// working directory (or the home directory of the module map file that
+  /// contained the 'extern module' directive importing this module map file
+  /// if any) rather than the directory containing the module map file.
+  //
+  /// The home directory is where we look for files named in the module map
+  /// file.
+  unsigned ModuleMapFileHomeIsCwd : 1;
+
+  /// The interval (in seconds) between pruning operations.
+  ///
+  /// This operation is expensive, because it requires Clang to walk through
+  /// the directory structure of the module cache, stat()'ing and removing
+  /// files.
+  ///
+  /// The default value is large, e.g., the operation runs once a week.
+  unsigned ModuleCachePruneInterval = 7 * 24 * 60 * 60;
+
+  /// The time (in seconds) after which an unused module file will be
+  /// considered unused and will, therefore, be pruned.
+  ///
+  /// When the module cache is pruned, any module file that has not been
+  /// accessed in this many seconds will be removed. The default value is
+  /// large, e.g., a month, to avoid forcing infrequently-used modules to be
+  /// regenerated often.
+  unsigned ModuleCachePruneAfter = 31 * 24 * 60 * 60;
+
+  /// The time in seconds when the build session started.
+  ///
+  /// This time is used by other optimizations in header search and module
+  /// loading.
+  uint64_t BuildSessionTimestamp = 0;
+
+  /// The set of macro names that should be ignored for the purposes
+  /// of computing the module hash.
+  llvm::SmallSetVector<llvm::CachedHashString, 16> ModulesIgnoreMacros;
+
+  /// The set of user-provided virtual filesystem overlay files.
+  std::vector<std::string> VFSOverlayFiles;
+
+  /// Include the compiler builtin includes.
+  unsigned UseBuiltinIncludes : 1;
+
+  /// Include the system standard include search directories.
+  unsigned UseStandardSystemIncludes : 1;
+
+  /// Include the system standard C++ library include search directories.
+  unsigned UseStandardCXXIncludes : 1;
+
+  /// Use libc++ instead of the default libstdc++.
+  unsigned UseLibcxx : 1;
+
+  /// Whether header search information should be output as for -v.
+  unsigned Verbose : 1;
+
+  /// If true, skip verifying input files used by modules if the
+  /// module was already verified during this build session (see
+  /// \c BuildSessionTimestamp).
+  unsigned ModulesValidateOncePerBuildSession : 1;
+
+  /// Whether to validate system input files when a module is loaded.
+  unsigned ModulesValidateSystemHeaders : 1;
+
+  /// Whether the module includes debug information (-gmodules).
+  unsigned UseDebugInfo : 1;
+
+  unsigned ModulesValidateDiagnosticOptions : 1;
+
+  unsigned ModulesHashContent : 1;
+
+  HeaderSearchOptions(StringRef _Sysroot = "/")
+      : Sysroot(_Sysroot), ModuleFormat("raw"), DisableModuleHash(false),
+        ImplicitModuleMaps(false), ModuleMapFileHomeIsCwd(false),
+        UseBuiltinIncludes(true), UseStandardSystemIncludes(true),
+        UseStandardCXXIncludes(true), UseLibcxx(false), Verbose(false),
+        ModulesValidateOncePerBuildSession(false),
+        ModulesValidateSystemHeaders(false), UseDebugInfo(false),
+        ModulesValidateDiagnosticOptions(true), ModulesHashContent(false) {}
+
+  /// AddPath - Add the \p Path path to the specified \p Group list.
+  void AddPath(StringRef Path, frontend::IncludeDirGroup Group,
+               bool IsFramework, bool IgnoreSysRoot) {
+    UserEntries.emplace_back(Path, Group, IsFramework, IgnoreSysRoot);
+  }
+
+  /// AddSystemHeaderPrefix - Override whether \#include directives naming a
+  /// path starting with \p Prefix should be considered as naming a system
+  /// header.
+  void AddSystemHeaderPrefix(StringRef Prefix, bool IsSystemHeader) {
+    SystemHeaderPrefixes.emplace_back(Prefix, IsSystemHeader);
+  }
+
+  void AddVFSOverlayFile(StringRef Name) {
+    VFSOverlayFiles.push_back(Name);
+  }
+
+  void AddPrebuiltModulePath(StringRef Name) {
+    PrebuiltModulePaths.push_back(Name);
+  }
+};
+
+} // namespace clang
+
+#endif // LLVM_CLANG_LEX_HEADERSEARCHOPTIONS_H