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diff --git a/include/clang/AST/DeclarationName.h b/include/clang/AST/DeclarationName.h
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+++ b/include/clang/AST/DeclarationName.h
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+//===-- DeclarationName.h - Representation of declaration names -*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file declares the DeclarationName and DeclarationNameTable classes.
+//
+//===----------------------------------------------------------------------===//
+#ifndef LLVM_CLANG_AST_DECLARATIONNAME_H
+#define LLVM_CLANG_AST_DECLARATIONNAME_H
+
+#include "clang/Basic/IdentifierTable.h"
+#include "clang/AST/Type.h"
+
+namespace llvm {
+  template <typename T> struct DenseMapInfo;
+}
+
+namespace clang {
+  class CXXSpecialName;
+  class CXXOperatorIdName;
+  class DeclarationNameExtra;
+  class IdentifierInfo;
+  class MultiKeywordSelector;
+  class UsingDirectiveDecl;
+
+/// DeclarationName - The name of a declaration. In the common case,
+/// this just stores an IdentifierInfo pointer to a normal
+/// name. However, it also provides encodings for Objective-C
+/// selectors (optimizing zero- and one-argument selectors, which make
+/// up 78% percent of all selectors in Cocoa.h) and special C++ names
+/// for constructors, destructors, and conversion functions.
+class DeclarationName {
+public:
+  /// NameKind - The kind of name this object contains.
+  enum NameKind {
+    Identifier,
+    ObjCZeroArgSelector,
+    ObjCOneArgSelector,
+    ObjCMultiArgSelector,
+    CXXConstructorName,
+    CXXDestructorName,
+    CXXConversionFunctionName,
+    CXXOperatorName,
+    CXXUsingDirective
+  };
+
+private:
+  /// StoredNameKind - The kind of name that is actually stored in the
+  /// upper bits of the Ptr field. This is only used internally.
+  enum StoredNameKind {
+    StoredIdentifier = 0,
+    StoredObjCZeroArgSelector,
+    StoredObjCOneArgSelector,
+    StoredDeclarationNameExtra,
+    PtrMask = 0x03
+  };
+
+  /// Ptr - The lowest two bits are used to express what kind of name
+  /// we're actually storing, using the values of NameKind. Depending
+  /// on the kind of name this is, the upper bits of Ptr may have one
+  /// of several different meanings:
+  ///
+  ///   StoredIdentifier - The name is a normal identifier, and Ptr is
+  ///   a normal IdentifierInfo pointer.
+  ///
+  ///   StoredObjCZeroArgSelector - The name is an Objective-C
+  ///   selector with zero arguments, and Ptr is an IdentifierInfo
+  ///   pointer pointing to the selector name.
+  ///
+  ///   StoredObjCOneArgSelector - The name is an Objective-C selector
+  ///   with one argument, and Ptr is an IdentifierInfo pointer
+  ///   pointing to the selector name.
+  ///
+  ///   StoredDeclarationNameExtra - Ptr is actually a pointer to a
+  ///   DeclarationNameExtra structure, whose first value will tell us
+  ///   whether this is an Objective-C selector, C++ operator-id name,
+  ///   or special C++ name.
+  uintptr_t Ptr;
+
+  /// getStoredNameKind - Return the kind of object that is stored in
+  /// Ptr.
+  StoredNameKind getStoredNameKind() const {
+    return static_cast<StoredNameKind>(Ptr & PtrMask);
+  }
+
+  /// getExtra - Get the "extra" information associated with this
+  /// multi-argument selector or C++ special name.
+  DeclarationNameExtra *getExtra() const {
+    assert(getStoredNameKind() == StoredDeclarationNameExtra &&
+           "Declaration name does not store an Extra structure");
+    return reinterpret_cast<DeclarationNameExtra *>(Ptr & ~PtrMask);
+  }
+
+  /// getAsCXXSpecialName - If the stored pointer is actually a
+  /// CXXSpecialName, returns a pointer to it. Otherwise, returns
+  /// a NULL pointer.
+  CXXSpecialName *getAsCXXSpecialName() const {
+    if (getNameKind() >= CXXConstructorName && 
+        getNameKind() <= CXXConversionFunctionName)
+      return reinterpret_cast<CXXSpecialName *>(Ptr & ~PtrMask);
+    return 0;
+  }
+
+  /// getAsCXXOperatorIdName
+  CXXOperatorIdName *getAsCXXOperatorIdName() const {
+    if (getNameKind() == CXXOperatorName)
+      return reinterpret_cast<CXXOperatorIdName *>(Ptr & ~PtrMask);
+    return 0;
+  }
+
+  // Construct a declaration name from the name of a C++ constructor,
+  // destructor, or conversion function.
+  DeclarationName(CXXSpecialName *Name) 
+    : Ptr(reinterpret_cast<uintptr_t>(Name)) { 
+    assert((Ptr & PtrMask) == 0 && "Improperly aligned CXXSpecialName");
+    Ptr |= StoredDeclarationNameExtra;
+  }
+
+  // Construct a declaration name from the name of a C++ overloaded
+  // operator.
+  DeclarationName(CXXOperatorIdName *Name) 
+    : Ptr(reinterpret_cast<uintptr_t>(Name)) { 
+    assert((Ptr & PtrMask) == 0 && "Improperly aligned CXXOperatorId");
+    Ptr |= StoredDeclarationNameExtra;
+  }
+
+  /// Construct a declaration name from a raw pointer.
+  DeclarationName(uintptr_t Ptr) : Ptr(Ptr) { }
+
+  friend class DeclarationNameTable;
+  friend class NamedDecl;
+
+  /// getFETokenInfoAsVoid - Retrieves the front end-specified pointer
+  /// for this name as a void pointer.
+  void *getFETokenInfoAsVoid() const;
+
+public:
+  /// DeclarationName - Used to create an empty selector.
+  DeclarationName() : Ptr(0) { }
+
+  // Construct a declaration name from an IdentifierInfo *.
+  DeclarationName(const IdentifierInfo *II) 
+    : Ptr(reinterpret_cast<uintptr_t>(II)) { 
+    assert((Ptr & PtrMask) == 0 && "Improperly aligned IdentifierInfo");
+  }
+
+  // Construct a declaration name from an Objective-C selector.
+  DeclarationName(Selector Sel);
+
+  /// getUsingDirectiveName - Return name for all using-directives.
+  static DeclarationName getUsingDirectiveName();
+
+  // operator bool() - Evaluates true when this declaration name is
+  // non-empty.
+  operator bool() const { 
+    return ((Ptr & PtrMask) != 0) || 
+           (reinterpret_cast<IdentifierInfo *>(Ptr & ~PtrMask));
+  }
+
+  /// Predicate functions for querying what type of name this is.
+  bool isIdentifier() const { return getStoredNameKind() == StoredIdentifier; }
+  bool isObjCZeroArgSelector() const {
+    return getStoredNameKind() == StoredObjCZeroArgSelector;
+  }
+  bool isObjCOneArgSelector() const {
+    return getStoredNameKind() == StoredObjCOneArgSelector;
+  }
+  
+  /// getNameKind - Determine what kind of name this is.
+  NameKind getNameKind() const;
+  
+
+  /// getName - Retrieve the human-readable string for this name.
+  std::string getAsString() const;
+
+  /// getAsIdentifierInfo - Retrieve the IdentifierInfo * stored in
+  /// this declaration name, or NULL if this declaration name isn't a
+  /// simple identifier.
+  IdentifierInfo *getAsIdentifierInfo() const { 
+    if (isIdentifier())
+      return reinterpret_cast<IdentifierInfo *>(Ptr);
+    return 0;
+  }
+
+  /// getAsOpaqueInteger - Get the representation of this declaration
+  /// name as an opaque integer.
+  uintptr_t getAsOpaqueInteger() const { return Ptr; }
+
+  /// getAsOpaquePtr - Get the representation of this declaration name as
+  /// an opaque pointer.
+  void *getAsOpaquePtr() const { return reinterpret_cast<void*>(Ptr); }
+
+  static DeclarationName getFromOpaqueInteger(uintptr_t P) {
+    DeclarationName N;
+    N.Ptr = P;
+    return N;
+  }
+  
+  /// getCXXNameType - If this name is one of the C++ names (of a
+  /// constructor, destructor, or conversion function), return the
+  /// type associated with that name.
+  QualType getCXXNameType() const;
+
+  /// getCXXOverloadedOperator - If this name is the name of an
+  /// overloadable operator in C++ (e.g., @c operator+), retrieve the
+  /// kind of overloaded operator.
+  OverloadedOperatorKind getCXXOverloadedOperator() const;
+
+  /// getObjCSelector - Get the Objective-C selector stored in this
+  /// declaration name.
+  Selector getObjCSelector() const;
+
+  /// getFETokenInfo/setFETokenInfo - The language front-end is
+  /// allowed to associate arbitrary metadata with some kinds of
+  /// declaration names, including normal identifiers and C++
+  /// constructors, destructors, and conversion functions.
+  template<typename T>
+  T *getFETokenInfo() const { return static_cast<T*>(getFETokenInfoAsVoid()); }
+
+  void setFETokenInfo(void *T);
+
+  /// operator== - Determine whether the specified names are identical..
+  friend bool operator==(DeclarationName LHS, DeclarationName RHS) {
+    return LHS.Ptr == RHS.Ptr;
+  }
+
+  /// operator!= - Determine whether the specified names are different.
+  friend bool operator!=(DeclarationName LHS, DeclarationName RHS) {
+    return LHS.Ptr != RHS.Ptr;
+  }
+
+  static DeclarationName getEmptyMarker() {
+    return DeclarationName(uintptr_t(-1));
+  }
+
+  static DeclarationName getTombstoneMarker() {
+    return DeclarationName(uintptr_t(-2));
+  }
+};
+
+/// Ordering on two declaration names. If both names are identifiers,
+/// this provides a lexicographical ordering.
+bool operator<(DeclarationName LHS, DeclarationName RHS);
+
+/// Ordering on two declaration names. If both names are identifiers,
+/// this provides a lexicographical ordering.
+inline bool operator>(DeclarationName LHS, DeclarationName RHS) {
+  return RHS < LHS;
+}
+
+/// Ordering on two declaration names. If both names are identifiers,
+/// this provides a lexicographical ordering.
+inline bool operator<=(DeclarationName LHS, DeclarationName RHS) {
+  return !(RHS < LHS);
+}
+
+/// Ordering on two declaration names. If both names are identifiers,
+/// this provides a lexicographical ordering.
+inline bool operator>=(DeclarationName LHS, DeclarationName RHS) {
+  return !(LHS < RHS);
+}
+
+/// DeclarationNameTable - Used to store and retrieve DeclarationName
+/// instances for the various kinds of declaration names, e.g., normal
+/// identifiers, C++ constructor names, etc. This class contains
+/// uniqued versions of each of the C++ special names, which can be
+/// retrieved using its member functions (e.g.,
+/// getCXXConstructorName).
+class DeclarationNameTable {
+  void *CXXSpecialNamesImpl; // Actually a FoldingSet<CXXSpecialName> *
+  CXXOperatorIdName *CXXOperatorNames; // Operator names
+
+  DeclarationNameTable(const DeclarationNameTable&);            // NONCOPYABLE
+  DeclarationNameTable& operator=(const DeclarationNameTable&); // NONCOPYABLE
+
+public:
+  DeclarationNameTable();
+  ~DeclarationNameTable();
+
+  /// getIdentifier - Create a declaration name that is a simple
+  /// identifier.
+  DeclarationName getIdentifier(IdentifierInfo *ID) {
+    return DeclarationName(ID);
+  }
+
+  /// getCXXConstructorName - Returns the name of a C++ constructor
+  /// for the given Type.
+  DeclarationName getCXXConstructorName(QualType Ty) {
+    return getCXXSpecialName(DeclarationName::CXXConstructorName, Ty);
+  }
+
+  /// getCXXDestructorName - Returns the name of a C++ destructor
+  /// for the given Type.
+  DeclarationName getCXXDestructorName(QualType Ty) {
+    return getCXXSpecialName(DeclarationName::CXXDestructorName, Ty);
+  }
+
+  /// getCXXConversionFunctionName - Returns the name of a C++
+  /// conversion function for the given Type.
+  DeclarationName getCXXConversionFunctionName(QualType Ty) {
+    return getCXXSpecialName(DeclarationName::CXXConversionFunctionName, Ty);
+  }
+
+  /// getCXXSpecialName - Returns a declaration name for special kind
+  /// of C++ name, e.g., for a constructor, destructor, or conversion
+  /// function.
+  DeclarationName getCXXSpecialName(DeclarationName::NameKind Kind, 
+                                    QualType Ty);
+
+  /// getCXXOperatorName - Get the name of the overloadable C++
+  /// operator corresponding to Op.
+  DeclarationName getCXXOperatorName(OverloadedOperatorKind Op);
+};  
+
+/// Insertion operator for diagnostics.  This allows sending DeclarationName's
+/// into a diagnostic with <<.
+inline const DiagnosticBuilder &operator<<(const DiagnosticBuilder &DB,
+                                           DeclarationName N) {
+  DB.AddTaggedVal(N.getAsOpaqueInteger(),
+                  Diagnostic::ak_declarationname);
+  return DB;
+}
+  
+  
+}  // end namespace clang
+
+namespace llvm {
+/// Define DenseMapInfo so that DeclarationNames can be used as keys
+/// in DenseMap and DenseSets.
+template<>
+struct DenseMapInfo<clang::DeclarationName> {
+  static inline clang::DeclarationName getEmptyKey() {
+    return clang::DeclarationName::getEmptyMarker();
+  }
+
+  static inline clang::DeclarationName getTombstoneKey() {
+    return clang::DeclarationName::getTombstoneMarker();
+  }
+
+  static unsigned getHashValue(clang::DeclarationName);
+
+  static inline bool 
+  isEqual(clang::DeclarationName LHS, clang::DeclarationName RHS) {
+    return LHS == RHS;
+  }
+
+  static inline bool isPod() { return true; }
+};
+
+}  // end namespace llvm
+
+#endif