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      1 //===-- DeclarationName.h - Representation of declaration names -*- C++ -*-===//
      2 //
      3 //                     The LLVM Compiler Infrastructure
      4 //
      5 // This file is distributed under the University of Illinois Open Source
      6 // License. See LICENSE.TXT for details.
      7 //
      8 //===----------------------------------------------------------------------===//
      9 //
     10 // This file declares the DeclarationName and DeclarationNameTable classes.
     11 //
     12 //===----------------------------------------------------------------------===//
     13 #ifndef LLVM_CLANG_AST_DECLARATIONNAME_H
     14 #define LLVM_CLANG_AST_DECLARATIONNAME_H
     15 
     16 #include "clang/Basic/IdentifierTable.h"
     17 #include "clang/Basic/PartialDiagnostic.h"
     18 #include "llvm/Support/Compiler.h"
     19 
     20 namespace llvm {
     21   template <typename T> struct DenseMapInfo;
     22 }
     23 
     24 namespace clang {
     25   class ASTContext;
     26   class CXXLiteralOperatorIdName;
     27   class CXXOperatorIdName;
     28   class CXXSpecialName;
     29   class DeclarationNameExtra;
     30   class IdentifierInfo;
     31   class MultiKeywordSelector;
     32   class QualType;
     33   class Type;
     34   class TypeSourceInfo;
     35   class UsingDirectiveDecl;
     36 
     37   template <typename> class CanQual;
     38   typedef CanQual<Type> CanQualType;
     39 
     40 /// DeclarationName - The name of a declaration. In the common case,
     41 /// this just stores an IdentifierInfo pointer to a normal
     42 /// name. However, it also provides encodings for Objective-C
     43 /// selectors (optimizing zero- and one-argument selectors, which make
     44 /// up 78% percent of all selectors in Cocoa.h) and special C++ names
     45 /// for constructors, destructors, and conversion functions.
     46 class DeclarationName {
     47 public:
     48   /// NameKind - The kind of name this object contains.
     49   enum NameKind {
     50     Identifier,
     51     ObjCZeroArgSelector,
     52     ObjCOneArgSelector,
     53     ObjCMultiArgSelector,
     54     CXXConstructorName,
     55     CXXDestructorName,
     56     CXXConversionFunctionName,
     57     CXXOperatorName,
     58     CXXLiteralOperatorName,
     59     CXXUsingDirective
     60   };
     61 
     62 private:
     63   /// StoredNameKind - The kind of name that is actually stored in the
     64   /// upper bits of the Ptr field. This is only used internally.
     65   ///
     66   /// Note: The entries here are synchronized with the entries in Selector,
     67   /// for efficient translation between the two.
     68   enum StoredNameKind {
     69     StoredIdentifier = 0,
     70     StoredObjCZeroArgSelector = 0x01,
     71     StoredObjCOneArgSelector = 0x02,
     72     StoredDeclarationNameExtra = 0x03,
     73     PtrMask = 0x03
     74   };
     75 
     76   /// Ptr - The lowest two bits are used to express what kind of name
     77   /// we're actually storing, using the values of NameKind. Depending
     78   /// on the kind of name this is, the upper bits of Ptr may have one
     79   /// of several different meanings:
     80   ///
     81   ///   StoredIdentifier - The name is a normal identifier, and Ptr is
     82   ///   a normal IdentifierInfo pointer.
     83   ///
     84   ///   StoredObjCZeroArgSelector - The name is an Objective-C
     85   ///   selector with zero arguments, and Ptr is an IdentifierInfo
     86   ///   pointer pointing to the selector name.
     87   ///
     88   ///   StoredObjCOneArgSelector - The name is an Objective-C selector
     89   ///   with one argument, and Ptr is an IdentifierInfo pointer
     90   ///   pointing to the selector name.
     91   ///
     92   ///   StoredDeclarationNameExtra - Ptr is actually a pointer to a
     93   ///   DeclarationNameExtra structure, whose first value will tell us
     94   ///   whether this is an Objective-C selector, C++ operator-id name,
     95   ///   or special C++ name.
     96   uintptr_t Ptr;
     97 
     98   /// getStoredNameKind - Return the kind of object that is stored in
     99   /// Ptr.
    100   StoredNameKind getStoredNameKind() const {
    101     return static_cast<StoredNameKind>(Ptr & PtrMask);
    102   }
    103 
    104   /// getExtra - Get the "extra" information associated with this
    105   /// multi-argument selector or C++ special name.
    106   DeclarationNameExtra *getExtra() const {
    107     assert(getStoredNameKind() == StoredDeclarationNameExtra &&
    108            "Declaration name does not store an Extra structure");
    109     return reinterpret_cast<DeclarationNameExtra *>(Ptr & ~PtrMask);
    110   }
    111 
    112   /// getAsCXXSpecialName - If the stored pointer is actually a
    113   /// CXXSpecialName, returns a pointer to it. Otherwise, returns
    114   /// a NULL pointer.
    115   CXXSpecialName *getAsCXXSpecialName() const {
    116     NameKind Kind = getNameKind();
    117     if (Kind >= CXXConstructorName && Kind <= CXXConversionFunctionName)
    118       return reinterpret_cast<CXXSpecialName *>(Ptr & ~PtrMask);
    119     return 0;
    120   }
    121 
    122   /// getAsCXXOperatorIdName
    123   CXXOperatorIdName *getAsCXXOperatorIdName() const {
    124     if (getNameKind() == CXXOperatorName)
    125       return reinterpret_cast<CXXOperatorIdName *>(Ptr & ~PtrMask);
    126     return 0;
    127   }
    128 
    129   CXXLiteralOperatorIdName *getAsCXXLiteralOperatorIdName() const {
    130     if (getNameKind() == CXXLiteralOperatorName)
    131       return reinterpret_cast<CXXLiteralOperatorIdName *>(Ptr & ~PtrMask);
    132     return 0;
    133   }
    134 
    135   // Construct a declaration name from the name of a C++ constructor,
    136   // destructor, or conversion function.
    137   DeclarationName(CXXSpecialName *Name)
    138     : Ptr(reinterpret_cast<uintptr_t>(Name)) {
    139     assert((Ptr & PtrMask) == 0 && "Improperly aligned CXXSpecialName");
    140     Ptr |= StoredDeclarationNameExtra;
    141   }
    142 
    143   // Construct a declaration name from the name of a C++ overloaded
    144   // operator.
    145   DeclarationName(CXXOperatorIdName *Name)
    146     : Ptr(reinterpret_cast<uintptr_t>(Name)) {
    147     assert((Ptr & PtrMask) == 0 && "Improperly aligned CXXOperatorId");
    148     Ptr |= StoredDeclarationNameExtra;
    149   }
    150 
    151   DeclarationName(CXXLiteralOperatorIdName *Name)
    152     : Ptr(reinterpret_cast<uintptr_t>(Name)) {
    153     assert((Ptr & PtrMask) == 0 && "Improperly aligned CXXLiteralOperatorId");
    154     Ptr |= StoredDeclarationNameExtra;
    155   }
    156 
    157   /// Construct a declaration name from a raw pointer.
    158   DeclarationName(uintptr_t Ptr) : Ptr(Ptr) { }
    159 
    160   friend class DeclarationNameTable;
    161   friend class NamedDecl;
    162 
    163   /// getFETokenInfoAsVoidSlow - Retrieves the front end-specified pointer
    164   /// for this name as a void pointer if it's not an identifier.
    165   void *getFETokenInfoAsVoidSlow() const;
    166 
    167 public:
    168   /// DeclarationName - Used to create an empty selector.
    169   DeclarationName() : Ptr(0) { }
    170 
    171   // Construct a declaration name from an IdentifierInfo *.
    172   DeclarationName(const IdentifierInfo *II)
    173     : Ptr(reinterpret_cast<uintptr_t>(II)) {
    174     assert((Ptr & PtrMask) == 0 && "Improperly aligned IdentifierInfo");
    175   }
    176 
    177   // Construct a declaration name from an Objective-C selector.
    178   DeclarationName(Selector Sel) : Ptr(Sel.InfoPtr) { }
    179 
    180   /// getUsingDirectiveName - Return name for all using-directives.
    181   static DeclarationName getUsingDirectiveName();
    182 
    183   // operator bool() - Evaluates true when this declaration name is
    184   // non-empty.
    185   LLVM_EXPLICIT operator bool() const {
    186     return ((Ptr & PtrMask) != 0) ||
    187            (reinterpret_cast<IdentifierInfo *>(Ptr & ~PtrMask));
    188   }
    189 
    190   /// \brief Evaluates true when this declaration name is empty.
    191   bool isEmpty() const {
    192     return !*this;
    193   }
    194 
    195   /// Predicate functions for querying what type of name this is.
    196   bool isIdentifier() const { return getStoredNameKind() == StoredIdentifier; }
    197   bool isObjCZeroArgSelector() const {
    198     return getStoredNameKind() == StoredObjCZeroArgSelector;
    199   }
    200   bool isObjCOneArgSelector() const {
    201     return getStoredNameKind() == StoredObjCOneArgSelector;
    202   }
    203 
    204   /// getNameKind - Determine what kind of name this is.
    205   NameKind getNameKind() const;
    206 
    207   /// \brief Determines whether the name itself is dependent, e.g., because it
    208   /// involves a C++ type that is itself dependent.
    209   ///
    210   /// Note that this does not capture all of the notions of "dependent name",
    211   /// because an identifier can be a dependent name if it is used as the
    212   /// callee in a call expression with dependent arguments.
    213   bool isDependentName() const;
    214 
    215   /// getNameAsString - Retrieve the human-readable string for this name.
    216   std::string getAsString() const;
    217 
    218   /// getAsIdentifierInfo - Retrieve the IdentifierInfo * stored in
    219   /// this declaration name, or NULL if this declaration name isn't a
    220   /// simple identifier.
    221   IdentifierInfo *getAsIdentifierInfo() const {
    222     if (isIdentifier())
    223       return reinterpret_cast<IdentifierInfo *>(Ptr);
    224     return 0;
    225   }
    226 
    227   /// getAsOpaqueInteger - Get the representation of this declaration
    228   /// name as an opaque integer.
    229   uintptr_t getAsOpaqueInteger() const { return Ptr; }
    230 
    231   /// getAsOpaquePtr - Get the representation of this declaration name as
    232   /// an opaque pointer.
    233   void *getAsOpaquePtr() const { return reinterpret_cast<void*>(Ptr); }
    234 
    235   static DeclarationName getFromOpaquePtr(void *P) {
    236     DeclarationName N;
    237     N.Ptr = reinterpret_cast<uintptr_t> (P);
    238     return N;
    239   }
    240 
    241   static DeclarationName getFromOpaqueInteger(uintptr_t P) {
    242     DeclarationName N;
    243     N.Ptr = P;
    244     return N;
    245   }
    246 
    247   /// getCXXNameType - If this name is one of the C++ names (of a
    248   /// constructor, destructor, or conversion function), return the
    249   /// type associated with that name.
    250   QualType getCXXNameType() const;
    251 
    252   /// getCXXOverloadedOperator - If this name is the name of an
    253   /// overloadable operator in C++ (e.g., @c operator+), retrieve the
    254   /// kind of overloaded operator.
    255   OverloadedOperatorKind getCXXOverloadedOperator() const;
    256 
    257   /// getCXXLiteralIdentifier - If this name is the name of a literal
    258   /// operator, retrieve the identifier associated with it.
    259   IdentifierInfo *getCXXLiteralIdentifier() const;
    260 
    261   /// getObjCSelector - Get the Objective-C selector stored in this
    262   /// declaration name.
    263   Selector getObjCSelector() const {
    264     assert((getNameKind() == ObjCZeroArgSelector ||
    265             getNameKind() == ObjCOneArgSelector ||
    266             getNameKind() == ObjCMultiArgSelector ||
    267             Ptr == 0) && "Not a selector!");
    268     return Selector(Ptr);
    269   }
    270 
    271   /// getFETokenInfo/setFETokenInfo - The language front-end is
    272   /// allowed to associate arbitrary metadata with some kinds of
    273   /// declaration names, including normal identifiers and C++
    274   /// constructors, destructors, and conversion functions.
    275   template<typename T>
    276   T *getFETokenInfo() const {
    277     if (const IdentifierInfo *Info = getAsIdentifierInfo())
    278       return Info->getFETokenInfo<T>();
    279     return static_cast<T*>(getFETokenInfoAsVoidSlow());
    280   }
    281 
    282   void setFETokenInfo(void *T);
    283 
    284   /// operator== - Determine whether the specified names are identical..
    285   friend bool operator==(DeclarationName LHS, DeclarationName RHS) {
    286     return LHS.Ptr == RHS.Ptr;
    287   }
    288 
    289   /// operator!= - Determine whether the specified names are different.
    290   friend bool operator!=(DeclarationName LHS, DeclarationName RHS) {
    291     return LHS.Ptr != RHS.Ptr;
    292   }
    293 
    294   static DeclarationName getEmptyMarker() {
    295     return DeclarationName(uintptr_t(-1));
    296   }
    297 
    298   static DeclarationName getTombstoneMarker() {
    299     return DeclarationName(uintptr_t(-2));
    300   }
    301 
    302   static int compare(DeclarationName LHS, DeclarationName RHS);
    303 
    304   void dump() const;
    305 };
    306 
    307 raw_ostream &operator<<(raw_ostream &OS, DeclarationName N);
    308 
    309 /// Ordering on two declaration names. If both names are identifiers,
    310 /// this provides a lexicographical ordering.
    311 inline bool operator<(DeclarationName LHS, DeclarationName RHS) {
    312   return DeclarationName::compare(LHS, RHS) < 0;
    313 }
    314 
    315 /// Ordering on two declaration names. If both names are identifiers,
    316 /// this provides a lexicographical ordering.
    317 inline bool operator>(DeclarationName LHS, DeclarationName RHS) {
    318   return DeclarationName::compare(LHS, RHS) > 0;
    319 }
    320 
    321 /// Ordering on two declaration names. If both names are identifiers,
    322 /// this provides a lexicographical ordering.
    323 inline bool operator<=(DeclarationName LHS, DeclarationName RHS) {
    324   return DeclarationName::compare(LHS, RHS) <= 0;
    325 }
    326 
    327 /// Ordering on two declaration names. If both names are identifiers,
    328 /// this provides a lexicographical ordering.
    329 inline bool operator>=(DeclarationName LHS, DeclarationName RHS) {
    330   return DeclarationName::compare(LHS, RHS) >= 0;
    331 }
    332 
    333 /// DeclarationNameTable - Used to store and retrieve DeclarationName
    334 /// instances for the various kinds of declaration names, e.g., normal
    335 /// identifiers, C++ constructor names, etc. This class contains
    336 /// uniqued versions of each of the C++ special names, which can be
    337 /// retrieved using its member functions (e.g.,
    338 /// getCXXConstructorName).
    339 class DeclarationNameTable {
    340   const ASTContext &Ctx;
    341   void *CXXSpecialNamesImpl; // Actually a FoldingSet<CXXSpecialName> *
    342   CXXOperatorIdName *CXXOperatorNames; // Operator names
    343   void *CXXLiteralOperatorNames; // Actually a CXXOperatorIdName*
    344 
    345   DeclarationNameTable(const DeclarationNameTable&) LLVM_DELETED_FUNCTION;
    346   void operator=(const DeclarationNameTable&) LLVM_DELETED_FUNCTION;
    347 
    348 public:
    349   DeclarationNameTable(const ASTContext &C);
    350   ~DeclarationNameTable();
    351 
    352   /// getIdentifier - Create a declaration name that is a simple
    353   /// identifier.
    354   DeclarationName getIdentifier(const IdentifierInfo *ID) {
    355     return DeclarationName(ID);
    356   }
    357 
    358   /// getCXXConstructorName - Returns the name of a C++ constructor
    359   /// for the given Type.
    360   DeclarationName getCXXConstructorName(CanQualType Ty);
    361 
    362   /// getCXXDestructorName - Returns the name of a C++ destructor
    363   /// for the given Type.
    364   DeclarationName getCXXDestructorName(CanQualType Ty);
    365 
    366   /// getCXXConversionFunctionName - Returns the name of a C++
    367   /// conversion function for the given Type.
    368   DeclarationName getCXXConversionFunctionName(CanQualType Ty);
    369 
    370   /// getCXXSpecialName - Returns a declaration name for special kind
    371   /// of C++ name, e.g., for a constructor, destructor, or conversion
    372   /// function.
    373   DeclarationName getCXXSpecialName(DeclarationName::NameKind Kind,
    374                                     CanQualType Ty);
    375 
    376   /// getCXXOperatorName - Get the name of the overloadable C++
    377   /// operator corresponding to Op.
    378   DeclarationName getCXXOperatorName(OverloadedOperatorKind Op);
    379 
    380   /// getCXXLiteralOperatorName - Get the name of the literal operator function
    381   /// with II as the identifier.
    382   DeclarationName getCXXLiteralOperatorName(IdentifierInfo *II);
    383 };
    384 
    385 /// DeclarationNameLoc - Additional source/type location info
    386 /// for a declaration name. Needs a DeclarationName in order
    387 /// to be interpreted correctly.
    388 struct DeclarationNameLoc {
    389   // The source location for identifier stored elsewhere.
    390   // struct {} Identifier;
    391 
    392   // Type info for constructors, destructors and conversion functions.
    393   // Locations (if any) for the tilde (destructor) or operator keyword
    394   // (conversion) are stored elsewhere.
    395   struct NT {
    396     TypeSourceInfo* TInfo;
    397   };
    398 
    399   // The location (if any) of the operator keyword is stored elsewhere.
    400   struct CXXOpName {
    401     unsigned BeginOpNameLoc;
    402     unsigned EndOpNameLoc;
    403   };
    404 
    405   // The location (if any) of the operator keyword is stored elsewhere.
    406   struct CXXLitOpName {
    407     unsigned OpNameLoc;
    408   };
    409 
    410   // struct {} CXXUsingDirective;
    411   // struct {} ObjCZeroArgSelector;
    412   // struct {} ObjCOneArgSelector;
    413   // struct {} ObjCMultiArgSelector;
    414   union {
    415     struct NT NamedType;
    416     struct CXXOpName CXXOperatorName;
    417     struct CXXLitOpName CXXLiteralOperatorName;
    418   };
    419 
    420   DeclarationNameLoc(DeclarationName Name);
    421   // FIXME: this should go away once all DNLocs are properly initialized.
    422   DeclarationNameLoc() { memset((void*) this, 0, sizeof(*this)); }
    423 }; // struct DeclarationNameLoc
    424 
    425 
    426 /// DeclarationNameInfo - A collector data type for bundling together
    427 /// a DeclarationName and the correspnding source/type location info.
    428 struct DeclarationNameInfo {
    429 private:
    430   /// Name - The declaration name, also encoding name kind.
    431   DeclarationName Name;
    432   /// Loc - The main source location for the declaration name.
    433   SourceLocation NameLoc;
    434   /// Info - Further source/type location info for special kinds of names.
    435   DeclarationNameLoc LocInfo;
    436 
    437 public:
    438   // FIXME: remove it.
    439   DeclarationNameInfo() {}
    440 
    441   DeclarationNameInfo(DeclarationName Name, SourceLocation NameLoc)
    442     : Name(Name), NameLoc(NameLoc), LocInfo(Name) {}
    443 
    444   DeclarationNameInfo(DeclarationName Name, SourceLocation NameLoc,
    445                       DeclarationNameLoc LocInfo)
    446     : Name(Name), NameLoc(NameLoc), LocInfo(LocInfo) {}
    447 
    448   /// getName - Returns the embedded declaration name.
    449   DeclarationName getName() const { return Name; }
    450   /// setName - Sets the embedded declaration name.
    451   void setName(DeclarationName N) { Name = N; }
    452 
    453   /// getLoc - Returns the main location of the declaration name.
    454   SourceLocation getLoc() const { return NameLoc; }
    455   /// setLoc - Sets the main location of the declaration name.
    456   void setLoc(SourceLocation L) { NameLoc = L; }
    457 
    458   const DeclarationNameLoc &getInfo() const { return LocInfo; }
    459   DeclarationNameLoc &getInfo() { return LocInfo; }
    460   void setInfo(const DeclarationNameLoc &Info) { LocInfo = Info; }
    461 
    462   /// getNamedTypeInfo - Returns the source type info associated to
    463   /// the name. Assumes it is a constructor, destructor or conversion.
    464   TypeSourceInfo *getNamedTypeInfo() const {
    465     assert(Name.getNameKind() == DeclarationName::CXXConstructorName ||
    466            Name.getNameKind() == DeclarationName::CXXDestructorName ||
    467            Name.getNameKind() == DeclarationName::CXXConversionFunctionName);
    468     return LocInfo.NamedType.TInfo;
    469   }
    470   /// setNamedTypeInfo - Sets the source type info associated to
    471   /// the name. Assumes it is a constructor, destructor or conversion.
    472   void setNamedTypeInfo(TypeSourceInfo *TInfo) {
    473     assert(Name.getNameKind() == DeclarationName::CXXConstructorName ||
    474            Name.getNameKind() == DeclarationName::CXXDestructorName ||
    475            Name.getNameKind() == DeclarationName::CXXConversionFunctionName);
    476     LocInfo.NamedType.TInfo = TInfo;
    477   }
    478 
    479   /// getCXXOperatorNameRange - Gets the range of the operator name
    480   /// (without the operator keyword). Assumes it is a (non-literal) operator.
    481   SourceRange getCXXOperatorNameRange() const {
    482     assert(Name.getNameKind() == DeclarationName::CXXOperatorName);
    483     return SourceRange(
    484      SourceLocation::getFromRawEncoding(LocInfo.CXXOperatorName.BeginOpNameLoc),
    485      SourceLocation::getFromRawEncoding(LocInfo.CXXOperatorName.EndOpNameLoc)
    486                        );
    487   }
    488   /// setCXXOperatorNameRange - Sets the range of the operator name
    489   /// (without the operator keyword). Assumes it is a C++ operator.
    490   void setCXXOperatorNameRange(SourceRange R) {
    491     assert(Name.getNameKind() == DeclarationName::CXXOperatorName);
    492     LocInfo.CXXOperatorName.BeginOpNameLoc = R.getBegin().getRawEncoding();
    493     LocInfo.CXXOperatorName.EndOpNameLoc = R.getEnd().getRawEncoding();
    494   }
    495 
    496   /// getCXXLiteralOperatorNameLoc - Returns the location of the literal
    497   /// operator name (not the operator keyword).
    498   /// Assumes it is a literal operator.
    499   SourceLocation getCXXLiteralOperatorNameLoc() const {
    500     assert(Name.getNameKind() == DeclarationName::CXXLiteralOperatorName);
    501     return SourceLocation::
    502       getFromRawEncoding(LocInfo.CXXLiteralOperatorName.OpNameLoc);
    503   }
    504   /// setCXXLiteralOperatorNameLoc - Sets the location of the literal
    505   /// operator name (not the operator keyword).
    506   /// Assumes it is a literal operator.
    507   void setCXXLiteralOperatorNameLoc(SourceLocation Loc) {
    508     assert(Name.getNameKind() == DeclarationName::CXXLiteralOperatorName);
    509     LocInfo.CXXLiteralOperatorName.OpNameLoc = Loc.getRawEncoding();
    510   }
    511 
    512   /// \brief Determine whether this name involves a template parameter.
    513   bool isInstantiationDependent() const;
    514 
    515   /// \brief Determine whether this name contains an unexpanded
    516   /// parameter pack.
    517   bool containsUnexpandedParameterPack() const;
    518 
    519   /// getAsString - Retrieve the human-readable string for this name.
    520   std::string getAsString() const;
    521 
    522   /// printName - Print the human-readable name to a stream.
    523   void printName(raw_ostream &OS) const;
    524 
    525   /// getBeginLoc - Retrieve the location of the first token.
    526   SourceLocation getBeginLoc() const { return NameLoc; }
    527   /// getEndLoc - Retrieve the location of the last token.
    528   SourceLocation getEndLoc() const;
    529   /// getSourceRange - The range of the declaration name.
    530   SourceRange getSourceRange() const LLVM_READONLY {
    531     return SourceRange(getLocStart(), getLocEnd());
    532   }
    533   SourceLocation getLocStart() const LLVM_READONLY {
    534     return getBeginLoc();
    535   }
    536   SourceLocation getLocEnd() const LLVM_READONLY {
    537     SourceLocation EndLoc = getEndLoc();
    538     return EndLoc.isValid() ? EndLoc : getLocStart();
    539   }
    540 };
    541 
    542 /// Insertion operator for diagnostics.  This allows sending DeclarationName's
    543 /// into a diagnostic with <<.
    544 inline const DiagnosticBuilder &operator<<(const DiagnosticBuilder &DB,
    545                                            DeclarationName N) {
    546   DB.AddTaggedVal(N.getAsOpaqueInteger(),
    547                   DiagnosticsEngine::ak_declarationname);
    548   return DB;
    549 }
    550 
    551 /// Insertion operator for partial diagnostics.  This allows binding
    552 /// DeclarationName's into a partial diagnostic with <<.
    553 inline const PartialDiagnostic &operator<<(const PartialDiagnostic &PD,
    554                                            DeclarationName N) {
    555   PD.AddTaggedVal(N.getAsOpaqueInteger(),
    556                   DiagnosticsEngine::ak_declarationname);
    557   return PD;
    558 }
    559 
    560 inline raw_ostream &operator<<(raw_ostream &OS,
    561                                      DeclarationNameInfo DNInfo) {
    562   DNInfo.printName(OS);
    563   return OS;
    564 }
    565 
    566 }  // end namespace clang
    567 
    568 namespace llvm {
    569 /// Define DenseMapInfo so that DeclarationNames can be used as keys
    570 /// in DenseMap and DenseSets.
    571 template<>
    572 struct DenseMapInfo<clang::DeclarationName> {
    573   static inline clang::DeclarationName getEmptyKey() {
    574     return clang::DeclarationName::getEmptyMarker();
    575   }
    576 
    577   static inline clang::DeclarationName getTombstoneKey() {
    578     return clang::DeclarationName::getTombstoneMarker();
    579   }
    580 
    581   static unsigned getHashValue(clang::DeclarationName Name) {
    582     return DenseMapInfo<void*>::getHashValue(Name.getAsOpaquePtr());
    583   }
    584 
    585   static inline bool
    586   isEqual(clang::DeclarationName LHS, clang::DeclarationName RHS) {
    587     return LHS == RHS;
    588   }
    589 };
    590 
    591 template <>
    592 struct isPodLike<clang::DeclarationName> { static const bool value = true; };
    593 
    594 }  // end namespace llvm
    595 
    596 #endif
    597