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diff --git a/clang/tools/libclang/CIndexer.h b/clang/tools/libclang/CIndexer.h
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+//===- CIndexer.h - Clang-C Source Indexing Library -------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines CIndexer, a subclass of Indexer that provides extra
+// functionality needed by the CIndex library.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_CINDEXER_H
+#define LLVM_CLANG_CINDEXER_H
+
+#include "clang-c/Index.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/Support/Path.h"
+#include <vector>
+
+namespace llvm {
+  class CrashRecoveryContext;
+}
+
+namespace clang {
+  class ASTUnit;
+
+class CIndexer {
+  bool OnlyLocalDecls;
+  bool DisplayDiagnostics;
+  unsigned Options; // CXGlobalOptFlags.
+
+  llvm::sys::Path ResourcesPath;
+  std::string WorkingDir;
+
+public:
+ CIndexer() : OnlyLocalDecls(false), DisplayDiagnostics(false),
+              Options(CXGlobalOpt_None) { }
+  
+  /// \brief Whether we only want to see "local" declarations (that did not
+  /// come from a previous precompiled header). If false, we want to see all
+  /// declarations.
+  bool getOnlyLocalDecls() const { return OnlyLocalDecls; }
+  void setOnlyLocalDecls(bool Local = true) { OnlyLocalDecls = Local; }
+  
+  bool getDisplayDiagnostics() const { return DisplayDiagnostics; }
+  void setDisplayDiagnostics(bool Display = true) {
+    DisplayDiagnostics = Display;
+  }
+
+  unsigned getCXGlobalOptFlags() const { return Options; }
+  void setCXGlobalOptFlags(unsigned options) { Options = options; }
+
+  bool isOptEnabled(CXGlobalOptFlags opt) const {
+    return Options & opt;
+  }
+
+  /// \brief Get the path of the clang resource files.
+  std::string getClangResourcesPath();
+
+  const std::string &getWorkingDirectory() const { return WorkingDir; }
+  void setWorkingDirectory(const std::string &Dir) { WorkingDir = Dir; }
+};
+
+  /**
+   * \brief Given a set of "unsaved" files, create temporary files and 
+   * construct the clang -cc1 argument list needed to perform the remapping.
+   *
+   * \returns true if an error occurred.
+   */
+  bool RemapFiles(unsigned num_unsaved_files,
+                  struct CXUnsavedFile *unsaved_files,
+                  std::vector<std::string> &RemapArgs,
+                  std::vector<llvm::sys::Path> &TemporaryFiles);
+
+  /// \brief Return the current size to request for "safety".
+  unsigned GetSafetyThreadStackSize();
+
+  /// \brief Set the current size to request for "safety" (or 0, if safety
+  /// threads should not be used).
+  void SetSafetyThreadStackSize(unsigned Value);
+
+  /// \brief Execution the given code "safely", using crash recovery or safety
+  /// threads when possible.
+  ///
+  /// \return False if a crash was detected.
+  bool RunSafely(llvm::CrashRecoveryContext &CRC,
+                 void (*Fn)(void*), void *UserData, unsigned Size = 0);
+
+  /// \brief Set the thread priority to background.
+  /// FIXME: Move to llvm/Support.
+  void setThreadBackgroundPriority();
+
+  /// \brief Print libclang's resource usage to standard error.
+  void PrintLibclangResourceUsage(CXTranslationUnit TU);
+
+  namespace cxindex {
+    void printDiagsToStderr(ASTUnit *Unit);
+  }
+}
+
+#endif