1 //===- TemplateName.h - C++ Template Name Representation --------*- C++ -*-===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 //  This file defines the TemplateName interface and subclasses.
10 //
11 //===----------------------------------------------------------------------===//
12 
13 #ifndef LLVM_CLANG_AST_TEMPLATENAME_H
14 #define LLVM_CLANG_AST_TEMPLATENAME_H
15 
16 #include "clang/AST/DependenceFlags.h"
17 #include "clang/AST/NestedNameSpecifier.h"
18 #include "clang/Basic/LLVM.h"
19 #include "llvm/ADT/FoldingSet.h"
20 #include "llvm/ADT/PointerIntPair.h"
21 #include "llvm/ADT/PointerUnion.h"
22 #include "llvm/Support/PointerLikeTypeTraits.h"
23 #include <cassert>
24 #include <optional>
25 
26 namespace clang {
27 
28 class ASTContext;
29 class Decl;
30 class DependentTemplateName;
31 class IdentifierInfo;
32 class NamedDecl;
33 class NestedNameSpecifier;
34 enum OverloadedOperatorKind : int;
35 class OverloadedTemplateStorage;
36 class AssumedTemplateStorage;
37 struct PrintingPolicy;
38 class QualifiedTemplateName;
39 class SubstTemplateTemplateParmPackStorage;
40 class SubstTemplateTemplateParmStorage;
41 class TemplateArgument;
42 class TemplateDecl;
43 class TemplateTemplateParmDecl;
44 class UsingShadowDecl;
45 
46 /// Implementation class used to describe either a set of overloaded
47 /// template names or an already-substituted template template parameter pack.
48 class UncommonTemplateNameStorage {
49 protected:
50   enum Kind {
51     Overloaded,
52     Assumed, // defined in DeclarationName.h
53     SubstTemplateTemplateParm,
54     SubstTemplateTemplateParmPack
55   };
56 
57   struct BitsTag {
58     /// A Kind.
59     unsigned Kind : 2;
60 
61     // The template parameter index.
62     unsigned Index : 15;
63 
64     /// The pack index, or the number of stored templates
65     /// or template arguments, depending on which subclass we have.
66     unsigned Data : 15;
67   };
68 
69   union {
70     struct BitsTag Bits;
71     void *PointerAlignment;
72   };
73 
UncommonTemplateNameStorage(Kind Kind,unsigned Index,unsigned Data)74   UncommonTemplateNameStorage(Kind Kind, unsigned Index, unsigned Data) {
75     Bits.Kind = Kind;
76     Bits.Index = Index;
77     Bits.Data = Data;
78   }
79 
80 public:
getAsOverloadedStorage()81   OverloadedTemplateStorage *getAsOverloadedStorage()  {
82     return Bits.Kind == Overloaded
83              ? reinterpret_cast<OverloadedTemplateStorage *>(this)
84              : nullptr;
85   }
86 
getAsAssumedTemplateName()87   AssumedTemplateStorage *getAsAssumedTemplateName()  {
88     return Bits.Kind == Assumed
89              ? reinterpret_cast<AssumedTemplateStorage *>(this)
90              : nullptr;
91   }
92 
getAsSubstTemplateTemplateParm()93   SubstTemplateTemplateParmStorage *getAsSubstTemplateTemplateParm() {
94     return Bits.Kind == SubstTemplateTemplateParm
95              ? reinterpret_cast<SubstTemplateTemplateParmStorage *>(this)
96              : nullptr;
97   }
98 
getAsSubstTemplateTemplateParmPack()99   SubstTemplateTemplateParmPackStorage *getAsSubstTemplateTemplateParmPack() {
100     return Bits.Kind == SubstTemplateTemplateParmPack
101              ? reinterpret_cast<SubstTemplateTemplateParmPackStorage *>(this)
102              : nullptr;
103   }
104 };
105 
106 /// A structure for storing the information associated with an
107 /// overloaded template name.
108 class OverloadedTemplateStorage : public UncommonTemplateNameStorage {
109   friend class ASTContext;
110 
OverloadedTemplateStorage(unsigned size)111   OverloadedTemplateStorage(unsigned size)
112       : UncommonTemplateNameStorage(Overloaded, 0, size) {}
113 
getStorage()114   NamedDecl **getStorage() {
115     return reinterpret_cast<NamedDecl **>(this + 1);
116   }
getStorage()117   NamedDecl * const *getStorage() const {
118     return reinterpret_cast<NamedDecl *const *>(this + 1);
119   }
120 
121 public:
size()122   unsigned size() const { return Bits.Data; }
123 
124   using iterator = NamedDecl *const *;
125 
begin()126   iterator begin() const { return getStorage(); }
end()127   iterator end() const { return getStorage() + Bits.Data; }
128 
decls()129   llvm::ArrayRef<NamedDecl*> decls() const {
130     return llvm::ArrayRef(begin(), end());
131   }
132 };
133 
134 /// A structure for storing an already-substituted template template
135 /// parameter pack.
136 ///
137 /// This kind of template names occurs when the parameter pack has been
138 /// provided with a template template argument pack in a context where its
139 /// enclosing pack expansion could not be fully expanded.
140 class SubstTemplateTemplateParmPackStorage : public UncommonTemplateNameStorage,
141                                              public llvm::FoldingSetNode {
142   const TemplateArgument *Arguments;
143   llvm::PointerIntPair<Decl *, 1, bool> AssociatedDeclAndFinal;
144 
145 public:
146   SubstTemplateTemplateParmPackStorage(ArrayRef<TemplateArgument> ArgPack,
147                                        Decl *AssociatedDecl, unsigned Index,
148                                        bool Final);
149 
150   /// A template-like entity which owns the whole pattern being substituted.
151   /// This will own a set of template parameters.
152   Decl *getAssociatedDecl() const;
153 
154   /// Returns the index of the replaced parameter in the associated declaration.
155   /// This should match the result of `getParameterPack()->getIndex()`.
getIndex()156   unsigned getIndex() const { return Bits.Index; }
157 
158   // When true the substitution will be 'Final' (subst node won't be placed).
159   bool getFinal() const;
160 
161   /// Retrieve the template template parameter pack being substituted.
162   TemplateTemplateParmDecl *getParameterPack() const;
163 
164   /// Retrieve the template template argument pack with which this
165   /// parameter was substituted.
166   TemplateArgument getArgumentPack() const;
167 
168   void Profile(llvm::FoldingSetNodeID &ID, ASTContext &Context);
169 
170   static void Profile(llvm::FoldingSetNodeID &ID, ASTContext &Context,
171                       const TemplateArgument &ArgPack, Decl *AssociatedDecl,
172                       unsigned Index, bool Final);
173 };
174 
175 /// Represents a C++ template name within the type system.
176 ///
177 /// A C++ template name refers to a template within the C++ type
178 /// system. In most cases, a template name is simply a reference to a
179 /// class template, e.g.
180 ///
181 /// \code
182 /// template<typename T> class X { };
183 ///
184 /// X<int> xi;
185 /// \endcode
186 ///
187 /// Here, the 'X' in \c X<int> is a template name that refers to the
188 /// declaration of the class template X, above. Template names can
189 /// also refer to function templates, C++0x template aliases, etc.
190 ///
191 /// Some template names are dependent. For example, consider:
192 ///
193 /// \code
194 /// template<typename MetaFun, typename T1, typename T2> struct apply2 {
195 ///   typedef typename MetaFun::template apply<T1, T2>::type type;
196 /// };
197 /// \endcode
198 ///
199 /// Here, "apply" is treated as a template name within the typename
200 /// specifier in the typedef. "apply" is a nested template, and can
201 /// only be understood in the context of
202 class TemplateName {
203   // NameDecl is either a TemplateDecl or a UsingShadowDecl depending on the
204   // NameKind.
205   // !! There is no free low bits in 32-bit builds to discriminate more than 4
206   // pointer types in PointerUnion.
207   using StorageType =
208       llvm::PointerUnion<Decl *, UncommonTemplateNameStorage *,
209                          QualifiedTemplateName *, DependentTemplateName *>;
210 
211   StorageType Storage;
212 
213   explicit TemplateName(void *Ptr);
214 
215 public:
216   // Kind of name that is actually stored.
217   enum NameKind {
218     /// A single template declaration.
219     Template,
220 
221     /// A set of overloaded template declarations.
222     OverloadedTemplate,
223 
224     /// An unqualified-id that has been assumed to name a function template
225     /// that will be found by ADL.
226     AssumedTemplate,
227 
228     /// A qualified template name, where the qualification is kept
229     /// to describe the source code as written.
230     QualifiedTemplate,
231 
232     /// A dependent template name that has not been resolved to a
233     /// template (or set of templates).
234     DependentTemplate,
235 
236     /// A template template parameter that has been substituted
237     /// for some other template name.
238     SubstTemplateTemplateParm,
239 
240     /// A template template parameter pack that has been substituted for
241     /// a template template argument pack, but has not yet been expanded into
242     /// individual arguments.
243     SubstTemplateTemplateParmPack,
244 
245     /// A template name that refers to a template declaration found through a
246     /// specific using shadow declaration.
247     UsingTemplate,
248   };
249 
250   TemplateName() = default;
251   explicit TemplateName(TemplateDecl *Template);
252   explicit TemplateName(OverloadedTemplateStorage *Storage);
253   explicit TemplateName(AssumedTemplateStorage *Storage);
254   explicit TemplateName(SubstTemplateTemplateParmStorage *Storage);
255   explicit TemplateName(SubstTemplateTemplateParmPackStorage *Storage);
256   explicit TemplateName(QualifiedTemplateName *Qual);
257   explicit TemplateName(DependentTemplateName *Dep);
258   explicit TemplateName(UsingShadowDecl *Using);
259 
260   /// Determine whether this template name is NULL.
261   bool isNull() const;
262 
263   // Get the kind of name that is actually stored.
264   NameKind getKind() const;
265 
266   /// Retrieve the underlying template declaration that
267   /// this template name refers to, if known.
268   ///
269   /// \returns The template declaration that this template name refers
270   /// to, if any. If the template name does not refer to a specific
271   /// declaration because it is a dependent name, or if it refers to a
272   /// set of function templates, returns NULL.
273   TemplateDecl *getAsTemplateDecl() const;
274 
275   /// Retrieve the underlying, overloaded function template
276   /// declarations that this template name refers to, if known.
277   ///
278   /// \returns The set of overloaded function templates that this template
279   /// name refers to, if known. If the template name does not refer to a
280   /// specific set of function templates because it is a dependent name or
281   /// refers to a single template, returns NULL.
282   OverloadedTemplateStorage *getAsOverloadedTemplate() const;
283 
284   /// Retrieve information on a name that has been assumed to be a
285   /// template-name in order to permit a call via ADL.
286   AssumedTemplateStorage *getAsAssumedTemplateName() const;
287 
288   /// Retrieve the substituted template template parameter, if
289   /// known.
290   ///
291   /// \returns The storage for the substituted template template parameter,
292   /// if known. Otherwise, returns NULL.
293   SubstTemplateTemplateParmStorage *getAsSubstTemplateTemplateParm() const;
294 
295   /// Retrieve the substituted template template parameter pack, if
296   /// known.
297   ///
298   /// \returns The storage for the substituted template template parameter pack,
299   /// if known. Otherwise, returns NULL.
300   SubstTemplateTemplateParmPackStorage *
301   getAsSubstTemplateTemplateParmPack() const;
302 
303   /// Retrieve the underlying qualified template name
304   /// structure, if any.
305   QualifiedTemplateName *getAsQualifiedTemplateName() const;
306 
307   /// Retrieve the underlying dependent template name
308   /// structure, if any.
309   DependentTemplateName *getAsDependentTemplateName() const;
310 
311   /// Retrieve the using shadow declaration through which the underlying
312   /// template declaration is introduced, if any.
313   UsingShadowDecl *getAsUsingShadowDecl() const;
314 
315   TemplateName getUnderlying() const;
316 
317   /// Get the template name to substitute when this template name is used as a
318   /// template template argument. This refers to the most recent declaration of
319   /// the template, including any default template arguments.
320   TemplateName getNameToSubstitute() const;
321 
322   TemplateNameDependence getDependence() const;
323 
324   /// Determines whether this is a dependent template name.
325   bool isDependent() const;
326 
327   /// Determines whether this is a template name that somehow
328   /// depends on a template parameter.
329   bool isInstantiationDependent() const;
330 
331   /// Determines whether this template name contains an
332   /// unexpanded parameter pack (for C++0x variadic templates).
333   bool containsUnexpandedParameterPack() const;
334 
335   enum class Qualified { None, AsWritten, Fully };
336   /// Print the template name.
337   ///
338   /// \param OS the output stream to which the template name will be
339   /// printed.
340   ///
341   /// \param Qual print the (Qualified::None) simple name,
342   /// (Qualified::AsWritten) any written (possibly partial) qualifier, or
343   /// (Qualified::Fully) the fully qualified name.
344   void print(raw_ostream &OS, const PrintingPolicy &Policy,
345              Qualified Qual = Qualified::AsWritten) const;
346 
347   /// Debugging aid that dumps the template name.
348   void dump(raw_ostream &OS) const;
349 
350   /// Debugging aid that dumps the template name to standard
351   /// error.
352   void dump() const;
353 
Profile(llvm::FoldingSetNodeID & ID)354   void Profile(llvm::FoldingSetNodeID &ID) {
355     ID.AddPointer(Storage.getOpaqueValue());
356   }
357 
358   /// Retrieve the template name as a void pointer.
getAsVoidPointer()359   void *getAsVoidPointer() const { return Storage.getOpaqueValue(); }
360 
361   /// Build a template name from a void pointer.
getFromVoidPointer(void * Ptr)362   static TemplateName getFromVoidPointer(void *Ptr) {
363     return TemplateName(Ptr);
364   }
365 };
366 
367 /// Insertion operator for diagnostics.  This allows sending TemplateName's
368 /// into a diagnostic with <<.
369 const StreamingDiagnostic &operator<<(const StreamingDiagnostic &DB,
370                                       TemplateName N);
371 
372 /// A structure for storing the information associated with a
373 /// substituted template template parameter.
374 class SubstTemplateTemplateParmStorage
375   : public UncommonTemplateNameStorage, public llvm::FoldingSetNode {
376   friend class ASTContext;
377 
378   TemplateName Replacement;
379   Decl *AssociatedDecl;
380 
SubstTemplateTemplateParmStorage(TemplateName Replacement,Decl * AssociatedDecl,unsigned Index,std::optional<unsigned> PackIndex)381   SubstTemplateTemplateParmStorage(TemplateName Replacement,
382                                    Decl *AssociatedDecl, unsigned Index,
383                                    std::optional<unsigned> PackIndex)
384       : UncommonTemplateNameStorage(SubstTemplateTemplateParm, Index,
385                                     PackIndex ? *PackIndex + 1 : 0),
386         Replacement(Replacement), AssociatedDecl(AssociatedDecl) {
387     assert(AssociatedDecl != nullptr);
388   }
389 
390 public:
391   /// A template-like entity which owns the whole pattern being substituted.
392   /// This will own a set of template parameters.
getAssociatedDecl()393   Decl *getAssociatedDecl() const { return AssociatedDecl; }
394 
395   /// Returns the index of the replaced parameter in the associated declaration.
396   /// This should match the result of `getParameter()->getIndex()`.
getIndex()397   unsigned getIndex() const { return Bits.Index; }
398 
getPackIndex()399   std::optional<unsigned> getPackIndex() const {
400     if (Bits.Data == 0)
401       return std::nullopt;
402     return Bits.Data - 1;
403   }
404 
405   TemplateTemplateParmDecl *getParameter() const;
getReplacement()406   TemplateName getReplacement() const { return Replacement; }
407 
408   void Profile(llvm::FoldingSetNodeID &ID);
409 
410   static void Profile(llvm::FoldingSetNodeID &ID, TemplateName Replacement,
411                       Decl *AssociatedDecl, unsigned Index,
412                       std::optional<unsigned> PackIndex);
413 };
414 
getUnderlying()415 inline TemplateName TemplateName::getUnderlying() const {
416   if (SubstTemplateTemplateParmStorage *subst
417         = getAsSubstTemplateTemplateParm())
418     return subst->getReplacement().getUnderlying();
419   return *this;
420 }
421 
422 /// Represents a template name that was expressed as a
423 /// qualified name.
424 ///
425 /// This kind of template name refers to a template name that was
426 /// preceded by a nested name specifier, e.g., \c std::vector. Here,
427 /// the nested name specifier is "std::" and the template name is the
428 /// declaration for "vector". The QualifiedTemplateName class is only
429 /// used to provide "sugar" for template names that were expressed
430 /// with a qualified name, and has no semantic meaning. In this
431 /// manner, it is to TemplateName what ElaboratedType is to Type,
432 /// providing extra syntactic sugar for downstream clients.
433 class QualifiedTemplateName : public llvm::FoldingSetNode {
434   friend class ASTContext;
435 
436   /// The nested name specifier that qualifies the template name.
437   ///
438   /// The bit is used to indicate whether the "template" keyword was
439   /// present before the template name itself. Note that the
440   /// "template" keyword is always redundant in this case (otherwise,
441   /// the template name would be a dependent name and we would express
442   /// this name with DependentTemplateName).
443   llvm::PointerIntPair<NestedNameSpecifier *, 1> Qualifier;
444 
445   /// The underlying template name, it is either
446   ///  1) a Template -- a template declaration that this qualified name refers
447   ///     to.
448   ///  2) or a UsingTemplate -- a template declaration introduced by a
449   ///     using-shadow declaration.
450   TemplateName UnderlyingTemplate;
451 
QualifiedTemplateName(NestedNameSpecifier * NNS,bool TemplateKeyword,TemplateName Template)452   QualifiedTemplateName(NestedNameSpecifier *NNS, bool TemplateKeyword,
453                         TemplateName Template)
454       : Qualifier(NNS, TemplateKeyword ? 1 : 0), UnderlyingTemplate(Template) {
455     assert(UnderlyingTemplate.getKind() == TemplateName::Template ||
456            UnderlyingTemplate.getKind() == TemplateName::UsingTemplate);
457   }
458 
459 public:
460   /// Return the nested name specifier that qualifies this name.
getQualifier()461   NestedNameSpecifier *getQualifier() const { return Qualifier.getPointer(); }
462 
463   /// Whether the template name was prefixed by the "template"
464   /// keyword.
hasTemplateKeyword()465   bool hasTemplateKeyword() const { return Qualifier.getInt(); }
466 
467   /// Return the underlying template name.
getUnderlyingTemplate()468   TemplateName getUnderlyingTemplate() const { return UnderlyingTemplate; }
469 
Profile(llvm::FoldingSetNodeID & ID)470   void Profile(llvm::FoldingSetNodeID &ID) {
471     Profile(ID, getQualifier(), hasTemplateKeyword(), UnderlyingTemplate);
472   }
473 
Profile(llvm::FoldingSetNodeID & ID,NestedNameSpecifier * NNS,bool TemplateKeyword,TemplateName TN)474   static void Profile(llvm::FoldingSetNodeID &ID, NestedNameSpecifier *NNS,
475                       bool TemplateKeyword, TemplateName TN) {
476     ID.AddPointer(NNS);
477     ID.AddBoolean(TemplateKeyword);
478     ID.AddPointer(TN.getAsVoidPointer());
479   }
480 };
481 
482 /// Represents a dependent template name that cannot be
483 /// resolved prior to template instantiation.
484 ///
485 /// This kind of template name refers to a dependent template name,
486 /// including its nested name specifier (if any). For example,
487 /// DependentTemplateName can refer to "MetaFun::template apply",
488 /// where "MetaFun::" is the nested name specifier and "apply" is the
489 /// template name referenced. The "template" keyword is implied.
490 class DependentTemplateName : public llvm::FoldingSetNode {
491   friend class ASTContext;
492 
493   /// The nested name specifier that qualifies the template
494   /// name.
495   ///
496   /// The bit stored in this qualifier describes whether the \c Name field
497   /// is interpreted as an IdentifierInfo pointer (when clear) or as an
498   /// overloaded operator kind (when set).
499   llvm::PointerIntPair<NestedNameSpecifier *, 1, bool> Qualifier;
500 
501   /// The dependent template name.
502   union {
503     /// The identifier template name.
504     ///
505     /// Only valid when the bit on \c Qualifier is clear.
506     const IdentifierInfo *Identifier;
507 
508     /// The overloaded operator name.
509     ///
510     /// Only valid when the bit on \c Qualifier is set.
511     OverloadedOperatorKind Operator;
512   };
513 
514   /// The canonical template name to which this dependent
515   /// template name refers.
516   ///
517   /// The canonical template name for a dependent template name is
518   /// another dependent template name whose nested name specifier is
519   /// canonical.
520   TemplateName CanonicalTemplateName;
521 
DependentTemplateName(NestedNameSpecifier * Qualifier,const IdentifierInfo * Identifier)522   DependentTemplateName(NestedNameSpecifier *Qualifier,
523                         const IdentifierInfo *Identifier)
524       : Qualifier(Qualifier, false), Identifier(Identifier),
525         CanonicalTemplateName(this) {}
526 
DependentTemplateName(NestedNameSpecifier * Qualifier,const IdentifierInfo * Identifier,TemplateName Canon)527   DependentTemplateName(NestedNameSpecifier *Qualifier,
528                         const IdentifierInfo *Identifier,
529                         TemplateName Canon)
530       : Qualifier(Qualifier, false), Identifier(Identifier),
531         CanonicalTemplateName(Canon) {}
532 
DependentTemplateName(NestedNameSpecifier * Qualifier,OverloadedOperatorKind Operator)533   DependentTemplateName(NestedNameSpecifier *Qualifier,
534                         OverloadedOperatorKind Operator)
535       : Qualifier(Qualifier, true), Operator(Operator),
536         CanonicalTemplateName(this) {}
537 
DependentTemplateName(NestedNameSpecifier * Qualifier,OverloadedOperatorKind Operator,TemplateName Canon)538   DependentTemplateName(NestedNameSpecifier *Qualifier,
539                         OverloadedOperatorKind Operator,
540                         TemplateName Canon)
541        : Qualifier(Qualifier, true), Operator(Operator),
542          CanonicalTemplateName(Canon) {}
543 
544 public:
545   /// Return the nested name specifier that qualifies this name.
getQualifier()546   NestedNameSpecifier *getQualifier() const { return Qualifier.getPointer(); }
547 
548   /// Determine whether this template name refers to an identifier.
isIdentifier()549   bool isIdentifier() const { return !Qualifier.getInt(); }
550 
551   /// Returns the identifier to which this template name refers.
getIdentifier()552   const IdentifierInfo *getIdentifier() const {
553     assert(isIdentifier() && "Template name isn't an identifier?");
554     return Identifier;
555   }
556 
557   /// Determine whether this template name refers to an overloaded
558   /// operator.
isOverloadedOperator()559   bool isOverloadedOperator() const { return Qualifier.getInt(); }
560 
561   /// Return the overloaded operator to which this template name refers.
getOperator()562   OverloadedOperatorKind getOperator() const {
563     assert(isOverloadedOperator() &&
564            "Template name isn't an overloaded operator?");
565     return Operator;
566   }
567 
Profile(llvm::FoldingSetNodeID & ID)568   void Profile(llvm::FoldingSetNodeID &ID) {
569     if (isIdentifier())
570       Profile(ID, getQualifier(), getIdentifier());
571     else
572       Profile(ID, getQualifier(), getOperator());
573   }
574 
Profile(llvm::FoldingSetNodeID & ID,NestedNameSpecifier * NNS,const IdentifierInfo * Identifier)575   static void Profile(llvm::FoldingSetNodeID &ID, NestedNameSpecifier *NNS,
576                       const IdentifierInfo *Identifier) {
577     ID.AddPointer(NNS);
578     ID.AddBoolean(false);
579     ID.AddPointer(Identifier);
580   }
581 
Profile(llvm::FoldingSetNodeID & ID,NestedNameSpecifier * NNS,OverloadedOperatorKind Operator)582   static void Profile(llvm::FoldingSetNodeID &ID, NestedNameSpecifier *NNS,
583                       OverloadedOperatorKind Operator) {
584     ID.AddPointer(NNS);
585     ID.AddBoolean(true);
586     ID.AddInteger(Operator);
587   }
588 };
589 
590 } // namespace clang.
591 
592 namespace llvm {
593 
594 /// The clang::TemplateName class is effectively a pointer.
595 template<>
596 struct PointerLikeTypeTraits<clang::TemplateName> {
597   static inline void *getAsVoidPointer(clang::TemplateName TN) {
598     return TN.getAsVoidPointer();
599   }
600 
601   static inline clang::TemplateName getFromVoidPointer(void *Ptr) {
602     return clang::TemplateName::getFromVoidPointer(Ptr);
603   }
604 
605   // No bits are available!
606   static constexpr int NumLowBitsAvailable = 0;
607 };
608 
609 } // namespace llvm.
610 
611 #endif // LLVM_CLANG_AST_TEMPLATENAME_H
612