1 //===- TypeLoc.cpp - Type Source Info Wrapper -----------------------------===//
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 TypeLoc subclasses implementations.
10 //
11 //===----------------------------------------------------------------------===//
12 
13 #include "clang/AST/TypeLoc.h"
14 #include "clang/AST/DeclTemplate.h"
15 #include "clang/AST/ASTContext.h"
16 #include "clang/AST/Attr.h"
17 #include "clang/AST/Expr.h"
18 #include "clang/AST/NestedNameSpecifier.h"
19 #include "clang/AST/TemplateBase.h"
20 #include "clang/AST/TemplateName.h"
21 #include "clang/AST/TypeLocVisitor.h"
22 #include "clang/Basic/SourceLocation.h"
23 #include "clang/Basic/Specifiers.h"
24 #include "llvm/Support/ErrorHandling.h"
25 #include "llvm/Support/MathExtras.h"
26 #include <algorithm>
27 #include <cassert>
28 #include <cstdint>
29 #include <cstring>
30 
31 using namespace clang;
32 
33 static const unsigned TypeLocMaxDataAlign = alignof(void *);
34 
35 //===----------------------------------------------------------------------===//
36 // TypeLoc Implementation
37 //===----------------------------------------------------------------------===//
38 
39 namespace {
40 
41 class TypeLocRanger : public TypeLocVisitor<TypeLocRanger, SourceRange> {
42 public:
43 #define ABSTRACT_TYPELOC(CLASS, PARENT)
44 #define TYPELOC(CLASS, PARENT) \
45   SourceRange Visit##CLASS##TypeLoc(CLASS##TypeLoc TyLoc) { \
46     return TyLoc.getLocalSourceRange(); \
47   }
48 #include "clang/AST/TypeLocNodes.def"
49 };
50 
51 } // namespace
52 
53 SourceRange TypeLoc::getLocalSourceRangeImpl(TypeLoc TL) {
54   if (TL.isNull()) return SourceRange();
55   return TypeLocRanger().Visit(TL);
56 }
57 
58 namespace {
59 
60 class TypeAligner : public TypeLocVisitor<TypeAligner, unsigned> {
61 public:
62 #define ABSTRACT_TYPELOC(CLASS, PARENT)
63 #define TYPELOC(CLASS, PARENT) \
64   unsigned Visit##CLASS##TypeLoc(CLASS##TypeLoc TyLoc) { \
65     return TyLoc.getLocalDataAlignment(); \
66   }
67 #include "clang/AST/TypeLocNodes.def"
68 };
69 
70 } // namespace
71 
72 /// Returns the alignment of the type source info data block.
73 unsigned TypeLoc::getLocalAlignmentForType(QualType Ty) {
74   if (Ty.isNull()) return 1;
75   return TypeAligner().Visit(TypeLoc(Ty, nullptr));
76 }
77 
78 namespace {
79 
80 class TypeSizer : public TypeLocVisitor<TypeSizer, unsigned> {
81 public:
82 #define ABSTRACT_TYPELOC(CLASS, PARENT)
83 #define TYPELOC(CLASS, PARENT) \
84   unsigned Visit##CLASS##TypeLoc(CLASS##TypeLoc TyLoc) { \
85     return TyLoc.getLocalDataSize(); \
86   }
87 #include "clang/AST/TypeLocNodes.def"
88 };
89 
90 } // namespace
91 
92 /// Returns the size of the type source info data block.
93 unsigned TypeLoc::getFullDataSizeForType(QualType Ty) {
94   unsigned Total = 0;
95   TypeLoc TyLoc(Ty, nullptr);
96   unsigned MaxAlign = 1;
97   while (!TyLoc.isNull()) {
98     unsigned Align = getLocalAlignmentForType(TyLoc.getType());
99     MaxAlign = std::max(Align, MaxAlign);
100     Total = llvm::alignTo(Total, Align);
101     Total += TypeSizer().Visit(TyLoc);
102     TyLoc = TyLoc.getNextTypeLoc();
103   }
104   Total = llvm::alignTo(Total, MaxAlign);
105   return Total;
106 }
107 
108 namespace {
109 
110 class NextLoc : public TypeLocVisitor<NextLoc, TypeLoc> {
111 public:
112 #define ABSTRACT_TYPELOC(CLASS, PARENT)
113 #define TYPELOC(CLASS, PARENT) \
114   TypeLoc Visit##CLASS##TypeLoc(CLASS##TypeLoc TyLoc) { \
115     return TyLoc.getNextTypeLoc(); \
116   }
117 #include "clang/AST/TypeLocNodes.def"
118 };
119 
120 } // namespace
121 
122 /// Get the next TypeLoc pointed by this TypeLoc, e.g for "int*" the
123 /// TypeLoc is a PointerLoc and next TypeLoc is for "int".
124 TypeLoc TypeLoc::getNextTypeLocImpl(TypeLoc TL) {
125   return NextLoc().Visit(TL);
126 }
127 
128 /// Initializes a type location, and all of its children
129 /// recursively, as if the entire tree had been written in the
130 /// given location.
131 void TypeLoc::initializeImpl(ASTContext &Context, TypeLoc TL,
132                              SourceLocation Loc) {
133   while (true) {
134     switch (TL.getTypeLocClass()) {
135 #define ABSTRACT_TYPELOC(CLASS, PARENT)
136 #define TYPELOC(CLASS, PARENT)        \
137     case CLASS: {                     \
138       CLASS##TypeLoc TLCasted = TL.castAs<CLASS##TypeLoc>(); \
139       TLCasted.initializeLocal(Context, Loc);  \
140       TL = TLCasted.getNextTypeLoc(); \
141       if (!TL) return;                \
142       continue;                       \
143     }
144 #include "clang/AST/TypeLocNodes.def"
145     }
146   }
147 }
148 
149 namespace {
150 
151 class TypeLocCopier : public TypeLocVisitor<TypeLocCopier> {
152   TypeLoc Source;
153 
154 public:
155   TypeLocCopier(TypeLoc source) : Source(source) {}
156 
157 #define ABSTRACT_TYPELOC(CLASS, PARENT)
158 #define TYPELOC(CLASS, PARENT)                          \
159   void Visit##CLASS##TypeLoc(CLASS##TypeLoc dest) {   \
160     dest.copyLocal(Source.castAs<CLASS##TypeLoc>());  \
161   }
162 #include "clang/AST/TypeLocNodes.def"
163 };
164 
165 } // namespace
166 
167 void TypeLoc::copy(TypeLoc other) {
168   assert(getFullDataSize() == other.getFullDataSize());
169 
170   // If both data pointers are aligned to the maximum alignment, we
171   // can memcpy because getFullDataSize() accurately reflects the
172   // layout of the data.
173   if (reinterpret_cast<uintptr_t>(Data) ==
174           llvm::alignTo(reinterpret_cast<uintptr_t>(Data),
175                         TypeLocMaxDataAlign) &&
176       reinterpret_cast<uintptr_t>(other.Data) ==
177           llvm::alignTo(reinterpret_cast<uintptr_t>(other.Data),
178                         TypeLocMaxDataAlign)) {
179     memcpy(Data, other.Data, getFullDataSize());
180     return;
181   }
182 
183   // Copy each of the pieces.
184   TypeLoc TL(getType(), Data);
185   do {
186     TypeLocCopier(other).Visit(TL);
187     other = other.getNextTypeLoc();
188   } while ((TL = TL.getNextTypeLoc()));
189 }
190 
191 SourceLocation TypeLoc::getBeginLoc() const {
192   TypeLoc Cur = *this;
193   TypeLoc LeftMost = Cur;
194   while (true) {
195     switch (Cur.getTypeLocClass()) {
196     case Elaborated:
197       LeftMost = Cur;
198       break;
199     case FunctionProto:
200       if (Cur.castAs<FunctionProtoTypeLoc>().getTypePtr()
201               ->hasTrailingReturn()) {
202         LeftMost = Cur;
203         break;
204       }
205       LLVM_FALLTHROUGH;
206     case FunctionNoProto:
207     case ConstantArray:
208     case DependentSizedArray:
209     case IncompleteArray:
210     case VariableArray:
211       // FIXME: Currently QualifiedTypeLoc does not have a source range
212     case Qualified:
213       Cur = Cur.getNextTypeLoc();
214       continue;
215     default:
216       if (Cur.getLocalSourceRange().getBegin().isValid())
217         LeftMost = Cur;
218       Cur = Cur.getNextTypeLoc();
219       if (Cur.isNull())
220         break;
221       continue;
222     } // switch
223     break;
224   } // while
225   return LeftMost.getLocalSourceRange().getBegin();
226 }
227 
228 SourceLocation TypeLoc::getEndLoc() const {
229   TypeLoc Cur = *this;
230   TypeLoc Last;
231   while (true) {
232     switch (Cur.getTypeLocClass()) {
233     default:
234       if (!Last)
235         Last = Cur;
236       return Last.getLocalSourceRange().getEnd();
237     case Paren:
238     case ConstantArray:
239     case DependentSizedArray:
240     case IncompleteArray:
241     case VariableArray:
242     case FunctionNoProto:
243       Last = Cur;
244       break;
245     case FunctionProto:
246       if (Cur.castAs<FunctionProtoTypeLoc>().getTypePtr()->hasTrailingReturn())
247         Last = TypeLoc();
248       else
249         Last = Cur;
250       break;
251     case Pointer:
252     case BlockPointer:
253     case MemberPointer:
254     case LValueReference:
255     case RValueReference:
256     case PackExpansion:
257       if (!Last)
258         Last = Cur;
259       break;
260     case Qualified:
261     case Elaborated:
262       break;
263     }
264     Cur = Cur.getNextTypeLoc();
265   }
266 }
267 
268 namespace {
269 
270 struct TSTChecker : public TypeLocVisitor<TSTChecker, bool> {
271   // Overload resolution does the real work for us.
272   static bool isTypeSpec(TypeSpecTypeLoc _) { return true; }
273   static bool isTypeSpec(TypeLoc _) { return false; }
274 
275 #define ABSTRACT_TYPELOC(CLASS, PARENT)
276 #define TYPELOC(CLASS, PARENT) \
277   bool Visit##CLASS##TypeLoc(CLASS##TypeLoc TyLoc) { \
278     return isTypeSpec(TyLoc); \
279   }
280 #include "clang/AST/TypeLocNodes.def"
281 };
282 
283 } // namespace
284 
285 /// Determines if the given type loc corresponds to a
286 /// TypeSpecTypeLoc.  Since there is not actually a TypeSpecType in
287 /// the type hierarchy, this is made somewhat complicated.
288 ///
289 /// There are a lot of types that currently use TypeSpecTypeLoc
290 /// because it's a convenient base class.  Ideally we would not accept
291 /// those here, but ideally we would have better implementations for
292 /// them.
293 bool TypeSpecTypeLoc::isKind(const TypeLoc &TL) {
294   if (TL.getType().hasLocalQualifiers()) return false;
295   return TSTChecker().Visit(TL);
296 }
297 
298 bool TagTypeLoc::isDefinition() const {
299   TagDecl *D = getDecl();
300   return D->isCompleteDefinition() &&
301          (D->getIdentifier() == nullptr || D->getLocation() == getNameLoc());
302 }
303 
304 // Reimplemented to account for GNU/C++ extension
305 //     typeof unary-expression
306 // where there are no parentheses.
307 SourceRange TypeOfExprTypeLoc::getLocalSourceRange() const {
308   if (getRParenLoc().isValid())
309     return SourceRange(getTypeofLoc(), getRParenLoc());
310   else
311     return SourceRange(getTypeofLoc(),
312                        getUnderlyingExpr()->getSourceRange().getEnd());
313 }
314 
315 
316 TypeSpecifierType BuiltinTypeLoc::getWrittenTypeSpec() const {
317   if (needsExtraLocalData())
318     return static_cast<TypeSpecifierType>(getWrittenBuiltinSpecs().Type);
319   switch (getTypePtr()->getKind()) {
320   case BuiltinType::Void:
321     return TST_void;
322   case BuiltinType::Bool:
323     return TST_bool;
324   case BuiltinType::Char_U:
325   case BuiltinType::Char_S:
326     return TST_char;
327   case BuiltinType::Char8:
328     return TST_char8;
329   case BuiltinType::Char16:
330     return TST_char16;
331   case BuiltinType::Char32:
332     return TST_char32;
333   case BuiltinType::WChar_S:
334   case BuiltinType::WChar_U:
335     return TST_wchar;
336   case BuiltinType::UChar:
337   case BuiltinType::UShort:
338   case BuiltinType::UInt:
339   case BuiltinType::ULong:
340   case BuiltinType::ULongLong:
341   case BuiltinType::UInt128:
342   case BuiltinType::SChar:
343   case BuiltinType::Short:
344   case BuiltinType::Int:
345   case BuiltinType::Long:
346   case BuiltinType::LongLong:
347   case BuiltinType::Int128:
348   case BuiltinType::Half:
349   case BuiltinType::Float:
350   case BuiltinType::Double:
351   case BuiltinType::LongDouble:
352   case BuiltinType::Float16:
353   case BuiltinType::Float128:
354   case BuiltinType::ShortAccum:
355   case BuiltinType::Accum:
356   case BuiltinType::LongAccum:
357   case BuiltinType::UShortAccum:
358   case BuiltinType::UAccum:
359   case BuiltinType::ULongAccum:
360   case BuiltinType::ShortFract:
361   case BuiltinType::Fract:
362   case BuiltinType::LongFract:
363   case BuiltinType::UShortFract:
364   case BuiltinType::UFract:
365   case BuiltinType::ULongFract:
366   case BuiltinType::SatShortAccum:
367   case BuiltinType::SatAccum:
368   case BuiltinType::SatLongAccum:
369   case BuiltinType::SatUShortAccum:
370   case BuiltinType::SatUAccum:
371   case BuiltinType::SatULongAccum:
372   case BuiltinType::SatShortFract:
373   case BuiltinType::SatFract:
374   case BuiltinType::SatLongFract:
375   case BuiltinType::SatUShortFract:
376   case BuiltinType::SatUFract:
377   case BuiltinType::SatULongFract:
378     llvm_unreachable("Builtin type needs extra local data!");
379     // Fall through, if the impossible happens.
380 
381   case BuiltinType::NullPtr:
382   case BuiltinType::Overload:
383   case BuiltinType::Dependent:
384   case BuiltinType::BoundMember:
385   case BuiltinType::UnknownAny:
386   case BuiltinType::ARCUnbridgedCast:
387   case BuiltinType::PseudoObject:
388   case BuiltinType::ObjCId:
389   case BuiltinType::ObjCClass:
390   case BuiltinType::ObjCSel:
391 #define IMAGE_TYPE(ImgType, Id, SingletonId, Access, Suffix) \
392   case BuiltinType::Id:
393 #include "clang/Basic/OpenCLImageTypes.def"
394 #define EXT_OPAQUE_TYPE(ExtType, Id, Ext) \
395   case BuiltinType::Id:
396 #include "clang/Basic/OpenCLExtensionTypes.def"
397   case BuiltinType::OCLSampler:
398   case BuiltinType::OCLEvent:
399   case BuiltinType::OCLClkEvent:
400   case BuiltinType::OCLQueue:
401   case BuiltinType::OCLReserveID:
402 #define SVE_TYPE(Name, Id, SingletonId) \
403   case BuiltinType::Id:
404 #include "clang/Basic/AArch64SVEACLETypes.def"
405   case BuiltinType::BuiltinFn:
406   case BuiltinType::OMPArraySection:
407   case BuiltinType::OMPArrayShaping:
408     return TST_unspecified;
409   }
410 
411   llvm_unreachable("Invalid BuiltinType Kind!");
412 }
413 
414 TypeLoc TypeLoc::IgnoreParensImpl(TypeLoc TL) {
415   while (ParenTypeLoc PTL = TL.getAs<ParenTypeLoc>())
416     TL = PTL.getInnerLoc();
417   return TL;
418 }
419 
420 SourceLocation TypeLoc::findNullabilityLoc() const {
421   if (auto ATL = getAs<AttributedTypeLoc>()) {
422     const Attr *A = ATL.getAttr();
423     if (A && (isa<TypeNullableAttr>(A) || isa<TypeNonNullAttr>(A) ||
424               isa<TypeNullUnspecifiedAttr>(A)))
425       return A->getLocation();
426   }
427 
428   return {};
429 }
430 
431 TypeLoc TypeLoc::findExplicitQualifierLoc() const {
432   // Qualified types.
433   if (auto qual = getAs<QualifiedTypeLoc>())
434     return qual;
435 
436   TypeLoc loc = IgnoreParens();
437 
438   // Attributed types.
439   if (auto attr = loc.getAs<AttributedTypeLoc>()) {
440     if (attr.isQualifier()) return attr;
441     return attr.getModifiedLoc().findExplicitQualifierLoc();
442   }
443 
444   // C11 _Atomic types.
445   if (auto atomic = loc.getAs<AtomicTypeLoc>()) {
446     return atomic;
447   }
448 
449   return {};
450 }
451 
452 void ObjCTypeParamTypeLoc::initializeLocal(ASTContext &Context,
453                                            SourceLocation Loc) {
454   setNameLoc(Loc);
455   if (!getNumProtocols()) return;
456 
457   setProtocolLAngleLoc(Loc);
458   setProtocolRAngleLoc(Loc);
459   for (unsigned i = 0, e = getNumProtocols(); i != e; ++i)
460     setProtocolLoc(i, Loc);
461 }
462 
463 void ObjCObjectTypeLoc::initializeLocal(ASTContext &Context,
464                                         SourceLocation Loc) {
465   setHasBaseTypeAsWritten(true);
466   setTypeArgsLAngleLoc(Loc);
467   setTypeArgsRAngleLoc(Loc);
468   for (unsigned i = 0, e = getNumTypeArgs(); i != e; ++i) {
469     setTypeArgTInfo(i,
470                    Context.getTrivialTypeSourceInfo(
471                      getTypePtr()->getTypeArgsAsWritten()[i], Loc));
472   }
473   setProtocolLAngleLoc(Loc);
474   setProtocolRAngleLoc(Loc);
475   for (unsigned i = 0, e = getNumProtocols(); i != e; ++i)
476     setProtocolLoc(i, Loc);
477 }
478 
479 SourceRange AttributedTypeLoc::getLocalSourceRange() const {
480   // Note that this does *not* include the range of the attribute
481   // enclosure, e.g.:
482   //    __attribute__((foo(bar)))
483   //    ^~~~~~~~~~~~~~~        ~~
484   // or
485   //    [[foo(bar)]]
486   //    ^~        ~~
487   // That enclosure doesn't necessarily belong to a single attribute
488   // anyway.
489   return getAttr() ? getAttr()->getRange() : SourceRange();
490 }
491 
492 void TypeOfTypeLoc::initializeLocal(ASTContext &Context,
493                                        SourceLocation Loc) {
494   TypeofLikeTypeLoc<TypeOfTypeLoc, TypeOfType, TypeOfTypeLocInfo>
495       ::initializeLocal(Context, Loc);
496   this->getLocalData()->UnderlyingTInfo = Context.getTrivialTypeSourceInfo(
497       getUnderlyingType(), Loc);
498 }
499 
500 void UnaryTransformTypeLoc::initializeLocal(ASTContext &Context,
501                                        SourceLocation Loc) {
502     setKWLoc(Loc);
503     setRParenLoc(Loc);
504     setLParenLoc(Loc);
505     this->setUnderlyingTInfo(
506         Context.getTrivialTypeSourceInfo(getTypePtr()->getBaseType(), Loc));
507 }
508 
509 void ElaboratedTypeLoc::initializeLocal(ASTContext &Context,
510                                         SourceLocation Loc) {
511   setElaboratedKeywordLoc(Loc);
512   NestedNameSpecifierLocBuilder Builder;
513   Builder.MakeTrivial(Context, getTypePtr()->getQualifier(), Loc);
514   setQualifierLoc(Builder.getWithLocInContext(Context));
515 }
516 
517 void DependentNameTypeLoc::initializeLocal(ASTContext &Context,
518                                            SourceLocation Loc) {
519   setElaboratedKeywordLoc(Loc);
520   NestedNameSpecifierLocBuilder Builder;
521   Builder.MakeTrivial(Context, getTypePtr()->getQualifier(), Loc);
522   setQualifierLoc(Builder.getWithLocInContext(Context));
523   setNameLoc(Loc);
524 }
525 
526 void
527 DependentTemplateSpecializationTypeLoc::initializeLocal(ASTContext &Context,
528                                                         SourceLocation Loc) {
529   setElaboratedKeywordLoc(Loc);
530   if (getTypePtr()->getQualifier()) {
531     NestedNameSpecifierLocBuilder Builder;
532     Builder.MakeTrivial(Context, getTypePtr()->getQualifier(), Loc);
533     setQualifierLoc(Builder.getWithLocInContext(Context));
534   } else {
535     setQualifierLoc(NestedNameSpecifierLoc());
536   }
537   setTemplateKeywordLoc(Loc);
538   setTemplateNameLoc(Loc);
539   setLAngleLoc(Loc);
540   setRAngleLoc(Loc);
541   TemplateSpecializationTypeLoc::initializeArgLocs(Context, getNumArgs(),
542                                                    getTypePtr()->getArgs(),
543                                                    getArgInfos(), Loc);
544 }
545 
546 void TemplateSpecializationTypeLoc::initializeArgLocs(ASTContext &Context,
547                                                       unsigned NumArgs,
548                                                   const TemplateArgument *Args,
549                                               TemplateArgumentLocInfo *ArgInfos,
550                                                       SourceLocation Loc) {
551   for (unsigned i = 0, e = NumArgs; i != e; ++i) {
552     switch (Args[i].getKind()) {
553     case TemplateArgument::Null:
554       llvm_unreachable("Impossible TemplateArgument");
555 
556     case TemplateArgument::Integral:
557     case TemplateArgument::Declaration:
558     case TemplateArgument::NullPtr:
559       ArgInfos[i] = TemplateArgumentLocInfo();
560       break;
561 
562     case TemplateArgument::Expression:
563       ArgInfos[i] = TemplateArgumentLocInfo(Args[i].getAsExpr());
564       break;
565 
566     case TemplateArgument::Type:
567       ArgInfos[i] = TemplateArgumentLocInfo(
568                           Context.getTrivialTypeSourceInfo(Args[i].getAsType(),
569                                                            Loc));
570       break;
571 
572     case TemplateArgument::Template:
573     case TemplateArgument::TemplateExpansion: {
574       NestedNameSpecifierLocBuilder Builder;
575       TemplateName Template = Args[i].getAsTemplateOrTemplatePattern();
576       if (DependentTemplateName *DTN = Template.getAsDependentTemplateName())
577         Builder.MakeTrivial(Context, DTN->getQualifier(), Loc);
578       else if (QualifiedTemplateName *QTN = Template.getAsQualifiedTemplateName())
579         Builder.MakeTrivial(Context, QTN->getQualifier(), Loc);
580 
581       ArgInfos[i] = TemplateArgumentLocInfo(
582           Builder.getWithLocInContext(Context), Loc,
583           Args[i].getKind() == TemplateArgument::Template ? SourceLocation()
584                                                           : Loc);
585       break;
586     }
587 
588     case TemplateArgument::Pack:
589       ArgInfos[i] = TemplateArgumentLocInfo();
590       break;
591     }
592   }
593 }
594 
595 DeclarationNameInfo AutoTypeLoc::getConceptNameInfo() const {
596   return DeclarationNameInfo(getNamedConcept()->getDeclName(),
597                              getLocalData()->ConceptNameLoc);
598 }
599 
600 void AutoTypeLoc::initializeLocal(ASTContext &Context, SourceLocation Loc) {
601   setNestedNameSpecifierLoc(NestedNameSpecifierLoc());
602   setTemplateKWLoc(Loc);
603   setConceptNameLoc(Loc);
604   setFoundDecl(nullptr);
605   setRAngleLoc(Loc);
606   setLAngleLoc(Loc);
607   TemplateSpecializationTypeLoc::initializeArgLocs(Context, getNumArgs(),
608                                                    getTypePtr()->getArgs(),
609                                                    getArgInfos(), Loc);
610   setNameLoc(Loc);
611 }
612 
613 
614 namespace {
615 
616   class GetContainedAutoTypeLocVisitor :
617     public TypeLocVisitor<GetContainedAutoTypeLocVisitor, TypeLoc> {
618   public:
619     using TypeLocVisitor<GetContainedAutoTypeLocVisitor, TypeLoc>::Visit;
620 
621     TypeLoc VisitAutoTypeLoc(AutoTypeLoc TL) {
622       return TL;
623     }
624 
625     // Only these types can contain the desired 'auto' type.
626 
627     TypeLoc VisitElaboratedTypeLoc(ElaboratedTypeLoc T) {
628       return Visit(T.getNamedTypeLoc());
629     }
630 
631     TypeLoc VisitQualifiedTypeLoc(QualifiedTypeLoc T) {
632       return Visit(T.getUnqualifiedLoc());
633     }
634 
635     TypeLoc VisitPointerTypeLoc(PointerTypeLoc T) {
636       return Visit(T.getPointeeLoc());
637     }
638 
639     TypeLoc VisitBlockPointerTypeLoc(BlockPointerTypeLoc T) {
640       return Visit(T.getPointeeLoc());
641     }
642 
643     TypeLoc VisitReferenceTypeLoc(ReferenceTypeLoc T) {
644       return Visit(T.getPointeeLoc());
645     }
646 
647     TypeLoc VisitMemberPointerTypeLoc(MemberPointerTypeLoc T) {
648       return Visit(T.getPointeeLoc());
649     }
650 
651     TypeLoc VisitArrayTypeLoc(ArrayTypeLoc T) {
652       return Visit(T.getElementLoc());
653     }
654 
655     TypeLoc VisitFunctionTypeLoc(FunctionTypeLoc T) {
656       return Visit(T.getReturnLoc());
657     }
658 
659     TypeLoc VisitParenTypeLoc(ParenTypeLoc T) {
660       return Visit(T.getInnerLoc());
661     }
662 
663     TypeLoc VisitAttributedTypeLoc(AttributedTypeLoc T) {
664       return Visit(T.getModifiedLoc());
665     }
666 
667     TypeLoc VisitMacroQualifiedTypeLoc(MacroQualifiedTypeLoc T) {
668       return Visit(T.getInnerLoc());
669     }
670 
671     TypeLoc VisitAdjustedTypeLoc(AdjustedTypeLoc T) {
672       return Visit(T.getOriginalLoc());
673     }
674 
675     TypeLoc VisitPackExpansionTypeLoc(PackExpansionTypeLoc T) {
676       return Visit(T.getPatternLoc());
677     }
678   };
679 
680 } // namespace
681 
682 AutoTypeLoc TypeLoc::getContainedAutoTypeLoc() const {
683   TypeLoc Res = GetContainedAutoTypeLocVisitor().Visit(*this);
684   if (Res.isNull())
685     return AutoTypeLoc();
686   return Res.getAs<AutoTypeLoc>();
687 }
688