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diff --git a/clang/include/clang/Serialization/ModuleManager.h b/clang/include/clang/Serialization/ModuleManager.h
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+//===--- ModuleManager.cpp - Module Manager ---------------------*- 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 the ModuleManager class, which manages a set of loaded
+//  modules for the ASTReader.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_SERIALIZATION_MODULE_MANAGER_H
+#define LLVM_CLANG_SERIALIZATION_MODULE_MANAGER_H
+
+#include "clang/Serialization/Module.h"
+#include "clang/Basic/FileManager.h"
+#include "llvm/ADT/DenseMap.h"
+
+namespace clang { 
+
+namespace serialization {
+  
+/// \brief Manages the set of modules loaded by an AST reader.
+class ModuleManager {
+  /// \brief The chain of AST files. The first entry is the one named by the
+  /// user, the last one is the one that doesn't depend on anything further.
+  llvm::SmallVector<ModuleFile*, 2> Chain;
+  
+  /// \brief All loaded modules, indexed by name.
+  llvm::DenseMap<const FileEntry *, ModuleFile *> Modules;
+  
+  /// \brief FileManager that handles translating between filenames and
+  /// FileEntry *.
+  FileManager FileMgr;
+  
+  /// \brief A lookup of in-memory (virtual file) buffers
+  llvm::DenseMap<const FileEntry *, llvm::MemoryBuffer *> InMemoryBuffers;
+  
+public:
+  typedef SmallVector<ModuleFile*, 2>::iterator ModuleIterator;
+  typedef SmallVector<ModuleFile*, 2>::const_iterator ModuleConstIterator;
+  typedef SmallVector<ModuleFile*, 2>::reverse_iterator ModuleReverseIterator;
+  typedef std::pair<uint32_t, StringRef> ModuleOffset;
+  
+  ModuleManager(const FileSystemOptions &FSO);
+  ~ModuleManager();
+  
+  /// \brief Forward iterator to traverse all loaded modules.  This is reverse
+  /// source-order.
+  ModuleIterator begin() { return Chain.begin(); }
+  /// \brief Forward iterator end-point to traverse all loaded modules
+  ModuleIterator end() { return Chain.end(); }
+  
+  /// \brief Const forward iterator to traverse all loaded modules.  This is 
+  /// in reverse source-order.
+  ModuleConstIterator begin() const { return Chain.begin(); }
+  /// \brief Const forward iterator end-point to traverse all loaded modules
+  ModuleConstIterator end() const { return Chain.end(); }
+  
+  /// \brief Reverse iterator to traverse all loaded modules.  This is in 
+  /// source order.
+  ModuleReverseIterator rbegin() { return Chain.rbegin(); }
+  /// \brief Reverse iterator end-point to traverse all loaded modules.
+  ModuleReverseIterator rend() { return Chain.rend(); }
+  
+  /// \brief Returns the primary module associated with the manager, that is,
+  /// the first module loaded
+  ModuleFile &getPrimaryModule() { return *Chain[0]; }
+  
+  /// \brief Returns the primary module associated with the manager, that is,
+  /// the first module loaded.
+  ModuleFile &getPrimaryModule() const { return *Chain[0]; }
+  
+  /// \brief Returns the module associated with the given index
+  ModuleFile &operator[](unsigned Index) const { return *Chain[Index]; }
+  
+  /// \brief Returns the module associated with the given name
+  ModuleFile *lookup(StringRef Name);
+  
+  /// \brief Returns the in-memory (virtual file) buffer with the given name
+  llvm::MemoryBuffer *lookupBuffer(StringRef Name);
+  
+  /// \brief Number of modules loaded
+  unsigned size() const { return Chain.size(); }
+  /// \brief Attempts to create a new module and add it to the list of known
+  /// modules.
+  ///
+  /// \param FileName The file name of the module to be loaded.
+  ///
+  /// \param Type The kind of module being loaded.
+  ///
+  /// \param ImportedBy The module that is importing this module, or NULL if
+  /// this module is imported directly by the user.
+  ///
+  /// \param Generation The generation in which this module was loaded.
+  ///
+  /// \param ErrorStr Will be set to a non-empty string if any errors occurred
+  /// while trying to load the module.
+  ///
+  /// \return A pointer to the module that corresponds to this file name,
+  /// and a boolean indicating whether the module was newly added.
+  std::pair<ModuleFile *, bool> 
+  addModule(StringRef FileName, ModuleKind Type, ModuleFile *ImportedBy,
+            unsigned Generation, std::string &ErrorStr);
+  
+  /// \brief Add an in-memory buffer the list of known buffers
+  void addInMemoryBuffer(StringRef FileName, llvm::MemoryBuffer *Buffer);
+  
+  /// \brief Visit each of the modules.
+  ///
+  /// This routine visits each of the modules, starting with the
+  /// "root" modules that no other loaded modules depend on, and
+  /// proceeding to the leaf modules, visiting each module only once
+  /// during the traversal.
+  ///
+  /// This traversal is intended to support various "lookup"
+  /// operations that can find data in any of the loaded modules.
+  ///
+  /// \param Visitor A visitor function that will be invoked with each
+  /// module and the given user data pointer. The return value must be
+  /// convertible to bool; when false, the visitation continues to
+  /// modules that the current module depends on. When true, the
+  /// visitation skips any modules that the current module depends on.
+  ///
+  /// \param UserData User data associated with the visitor object, which
+  /// will be passed along to the visitor.
+  void visit(bool (*Visitor)(ModuleFile &M, void *UserData), void *UserData);
+  
+  /// \brief Visit each of the modules with a depth-first traversal.
+  ///
+  /// This routine visits each of the modules known to the module
+  /// manager using a depth-first search, starting with the first
+  /// loaded module. The traversal invokes the callback both before
+  /// traversing the children (preorder traversal) and after
+  /// traversing the children (postorder traversal).
+  ///
+  /// \param Visitor A visitor function that will be invoked with each
+  /// module and given a \c Preorder flag that indicates whether we're
+  /// visiting the module before or after visiting its children.  The
+  /// visitor may return true at any time to abort the depth-first
+  /// visitation.
+  ///
+  /// \param UserData User data ssociated with the visitor object,
+  /// which will be passed along to the user.
+  void visitDepthFirst(bool (*Visitor)(ModuleFile &M, bool Preorder, 
+                                       void *UserData), 
+                       void *UserData);
+  
+  /// \brief View the graphviz representation of the module graph.
+  void viewGraph();
+};
+
+} } // end namespace clang::serialization
+
+#endif